fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 107                 const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                 const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         label->lfs = 0;
 126         label->pi = 0;
 127         label->len = 0;
 128         label->label = NULL;
 129
 130         err = security_dentry_init_security(dentry, sattr->ia_mode,
 131                                 &dentry->d_name, NULL,
 132                                 (void **)&label->label, &label->len);
 133         if (err == 0)
 134                 return label;
 135
 136         return NULL;
 137 }
 138 static inline void
 139 nfs4_label_release_security(struct nfs4_label *label)
 140 {
 141         if (label)
 142                 security_release_secctx(label->label, label->len);
 143 }
 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 145 {
 146         if (label)
 147                 return server->attr_bitmask;
 148
 149         return server->attr_bitmask_nl;
 150 }
 151 #else
 152 static inline struct nfs4_label *
 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 154         struct iattr *sattr, struct nfs4_label *l)
 155 { return NULL; }
 156 static inline void
 157 nfs4_label_release_security(struct nfs4_label *label)
 158 { return; }
 159 static inline u32 *
 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 161 { return server->attr_bitmask; }
 162 #endif
 163
 164 /* Prevent leaks of NFSv4 errors into userland */
 165 static int nfs4_map_errors(int err)
 166 {
 167         if (err >= -1000)
 168                 return err;
 169         switch (err) {
 170         case -NFS4ERR_RESOURCE:
 171         case -NFS4ERR_LAYOUTTRYLATER:
 172         case -NFS4ERR_RECALLCONFLICT:
 173                 return -EREMOTEIO;
 174         case -NFS4ERR_WRONGSEC:
 175         case -NFS4ERR_WRONG_CRED:
 176                 return -EPERM;
 177         case -NFS4ERR_BADOWNER:
 178         case -NFS4ERR_BADNAME:
 179                 return -EINVAL;
 180         case -NFS4ERR_SHARE_DENIED:
 181                 return -EACCES;
 182         case -NFS4ERR_MINOR_VERS_MISMATCH:
 183                 return -EPROTONOSUPPORT;
 184         case -NFS4ERR_FILE_OPEN:
 185                 return -EBUSY;
 186         case -NFS4ERR_NOT_SAME:
 187                 return -ENOTSYNC;
 188         default:
 189                 dprintk("%s could not handle NFSv4 error %d\n",
 190                                 __func__, -err);
 191                 break;
 192         }
 193         return -EIO;
 194 }
 195
 196 /*
 197  * This is our standard bitmap for GETATTR requests.
 198  */
 199 const u32 nfs4_fattr_bitmap[3] = {
 200         FATTR4_WORD0_TYPE
 201         | FATTR4_WORD0_CHANGE
 202         | FATTR4_WORD0_SIZE
 203         | FATTR4_WORD0_FSID
 204         | FATTR4_WORD0_FILEID,
 205         FATTR4_WORD1_MODE
 206         | FATTR4_WORD1_NUMLINKS
 207         | FATTR4_WORD1_OWNER
 208         | FATTR4_WORD1_OWNER_GROUP
 209         | FATTR4_WORD1_RAWDEV
 210         | FATTR4_WORD1_SPACE_USED
 211         | FATTR4_WORD1_TIME_ACCESS
 212         | FATTR4_WORD1_TIME_METADATA
 213         | FATTR4_WORD1_TIME_MODIFY
 214         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 215 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 216         FATTR4_WORD2_SECURITY_LABEL
 217 #endif
 218 };
 219
 220 static const u32 nfs4_pnfs_open_bitmap[3] = {
 221         FATTR4_WORD0_TYPE
 222         | FATTR4_WORD0_CHANGE
 223         | FATTR4_WORD0_SIZE
 224         | FATTR4_WORD0_FSID
 225         | FATTR4_WORD0_FILEID,
 226         FATTR4_WORD1_MODE
 227         | FATTR4_WORD1_NUMLINKS
 228         | FATTR4_WORD1_OWNER
 229         | FATTR4_WORD1_OWNER_GROUP
 230         | FATTR4_WORD1_RAWDEV
 231         | FATTR4_WORD1_SPACE_USED
 232         | FATTR4_WORD1_TIME_ACCESS
 233         | FATTR4_WORD1_TIME_METADATA
 234         | FATTR4_WORD1_TIME_MODIFY,
 235         FATTR4_WORD2_MDSTHRESHOLD
 236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 237         | FATTR4_WORD2_SECURITY_LABEL
 238 #endif
 239 };
 240
 241 static const u32 nfs4_open_noattr_bitmap[3] = {
 242         FATTR4_WORD0_TYPE
 243         | FATTR4_WORD0_FILEID,
 244 };
 245
 246 const u32 nfs4_statfs_bitmap[3] = {
 247         FATTR4_WORD0_FILES_AVAIL
 248         | FATTR4_WORD0_FILES_FREE
 249         | FATTR4_WORD0_FILES_TOTAL,
 250         FATTR4_WORD1_SPACE_AVAIL
 251         | FATTR4_WORD1_SPACE_FREE
 252         | FATTR4_WORD1_SPACE_TOTAL
 253 };
 254
 255 const u32 nfs4_pathconf_bitmap[3] = {
 256         FATTR4_WORD0_MAXLINK
 257         | FATTR4_WORD0_MAXNAME,
 258         0
 259 };
 260
 261 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 262                         | FATTR4_WORD0_MAXREAD
 263                         | FATTR4_WORD0_MAXWRITE
 264                         | FATTR4_WORD0_LEASE_TIME,
 265                         FATTR4_WORD1_TIME_DELTA
 266                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 267                         FATTR4_WORD2_LAYOUT_BLKSIZE
 268                         | FATTR4_WORD2_CLONE_BLKSIZE
 269                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 270                         | FATTR4_WORD2_XATTR_SUPPORT
 271 };
 272
 273 const u32 nfs4_fs_locations_bitmap[3] = {
 274         FATTR4_WORD0_CHANGE
 275         | FATTR4_WORD0_SIZE
 276         | FATTR4_WORD0_FSID
 277         | FATTR4_WORD0_FILEID
 278         | FATTR4_WORD0_FS_LOCATIONS,
 279         FATTR4_WORD1_OWNER
 280         | FATTR4_WORD1_OWNER_GROUP
 281         | FATTR4_WORD1_RAWDEV
 282         | FATTR4_WORD1_SPACE_USED
 283         | FATTR4_WORD1_TIME_ACCESS
 284         | FATTR4_WORD1_TIME_METADATA
 285         | FATTR4_WORD1_TIME_MODIFY
 286         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 287 };
 288
 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 290                                     struct inode *inode, unsigned long flags)
 291 {
 292         unsigned long cache_validity;
 293
 294         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 295         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 296                 return;
 297
 298         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 299
 300         /* Remove the attributes over which we have full control */
 301         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 302         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 303                 dst[0] &= ~FATTR4_WORD0_SIZE;
 304
 305         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 306                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 307
 308         if (!(cache_validity & NFS_INO_INVALID_MODE))
 309                 dst[1] &= ~FATTR4_WORD1_MODE;
 310         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 311                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 312 }
 313
 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 315                 struct nfs4_readdir_arg *readdir)
 316 {
 317         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 318         __be32 *start, *p;
 319
 320         if (cookie > 2) {
 321                 readdir->cookie = cookie;
 322                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 323                 return;
 324         }
 325
 326         readdir->cookie = 0;
 327         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 328         if (cookie == 2)
 329                 return;
 330
 331         /*
 332          * NFSv4 servers do not return entries for '.' and '..'
 333          * Therefore, we fake these entries here.  We let '.'
 334          * have cookie 0 and '..' have cookie 1.  Note that
 335          * when talking to the server, we always send cookie 0
 336          * instead of 1 or 2.
 337          */
 338         start = p = kmap_atomic(*readdir->pages);
 339
 340         if (cookie == 0) {
 341                 *p++ = xdr_one;                                  /* next */
 342                 *p++ = xdr_zero;                   /* cookie, first word */
 343                 *p++ = xdr_one;                   /* cookie, second word */
 344                 *p++ = xdr_one;                             /* entry len */
 345                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 346                 p++;
 347                 *p++ = xdr_one;                         /* bitmap length */
 348                 *p++ = htonl(attrs);                           /* bitmap */
 349                 *p++ = htonl(12);             /* attribute buffer length */
 350                 *p++ = htonl(NF4DIR);
 351                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 352         }
 353
 354         *p++ = xdr_one;                                  /* next */
 355         *p++ = xdr_zero;                   /* cookie, first word */
 356         *p++ = xdr_two;                   /* cookie, second word */
 357         *p++ = xdr_two;                             /* entry len */
 358         memcpy(p, "..\0\0", 4);                         /* entry */
 359         p++;
 360         *p++ = xdr_one;                         /* bitmap length */
 361         *p++ = htonl(attrs);                           /* bitmap */
 362         *p++ = htonl(12);             /* attribute buffer length */
 363         *p++ = htonl(NF4DIR);
 364         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 365
 366         readdir->pgbase = (char *)p - (char *)start;
 367         readdir->count -= readdir->pgbase;
 368         kunmap_atomic(start);
 369 }
 370
 371 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 372 {
 373         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 374                 fattr->pre_change_attr = version;
 375                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 376         }
 377 }
 378
 379 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 380                 nfs4_stateid *stateid,
 381                 const struct cred *cred)
 382 {
 383         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 384
 385         ops->test_and_free_expired(server, stateid, cred);
 386 }
 387
 388 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 389                 nfs4_stateid *stateid,
 390                 const struct cred *cred)
 391 {
 392         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 393         nfs4_test_and_free_stateid(server, stateid, cred);
 394 }
 395
 396 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 397                 const nfs4_stateid *stateid,
 398                 const struct cred *cred)
 399 {
 400         nfs4_stateid tmp;
 401
 402         nfs4_stateid_copy(&tmp, stateid);
 403         __nfs4_free_revoked_stateid(server, &tmp, cred);
 404 }
 405
 406 static long nfs4_update_delay(long *timeout)
 407 {
 408         long ret;
 409         if (!timeout)
 410                 return NFS4_POLL_RETRY_MAX;
 411         if (*timeout <= 0)
 412                 *timeout = NFS4_POLL_RETRY_MIN;
 413         if (*timeout > NFS4_POLL_RETRY_MAX)
 414                 *timeout = NFS4_POLL_RETRY_MAX;
 415         ret = *timeout;
 416         *timeout <<= 1;
 417         return ret;
 418 }
 419
 420 static int nfs4_delay_killable(long *timeout)
 421 {
 422         might_sleep();
 423
 424         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 425         schedule_timeout(nfs4_update_delay(timeout));
 426         if (!__fatal_signal_pending(current))
 427                 return 0;
 428         return -EINTR;
 429 }
 430
 431 static int nfs4_delay_interruptible(long *timeout)
 432 {
 433         might_sleep();
 434
 435         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 436         schedule_timeout(nfs4_update_delay(timeout));
 437         if (!signal_pending(current))
 438                 return 0;
 439         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 440 }
 441
 442 static int nfs4_delay(long *timeout, bool interruptible)
 443 {
 444         if (interruptible)
 445                 return nfs4_delay_interruptible(timeout);
 446         return nfs4_delay_killable(timeout);
 447 }
 448
 449 static const nfs4_stateid *
 450 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 451 {
 452         if (!stateid)
 453                 return NULL;
 454         switch (stateid->type) {
 455         case NFS4_OPEN_STATEID_TYPE:
 456         case NFS4_LOCK_STATEID_TYPE:
 457         case NFS4_DELEGATION_STATEID_TYPE:
 458                 return stateid;
 459         default:
 460                 break;
 461         }
 462         return NULL;
 463 }
 464
 465 /* This is the error handling routine for processes that are allowed
 466  * to sleep.
 467  */
 468 static int nfs4_do_handle_exception(struct nfs_server *server,
 469                 int errorcode, struct nfs4_exception *exception)
 470 {
 471         struct nfs_client *clp = server->nfs_client;
 472         struct nfs4_state *state = exception->state;
 473         const nfs4_stateid *stateid;
 474         struct inode *inode = exception->inode;
 475         int ret = errorcode;
 476
 477         exception->delay = 0;
 478         exception->recovering = 0;
 479         exception->retry = 0;
 480
 481         stateid = nfs4_recoverable_stateid(exception->stateid);
 482         if (stateid == NULL && state != NULL)
 483                 stateid = nfs4_recoverable_stateid(&state->stateid);
 484
 485         switch(errorcode) {
 486                 case 0:
 487                         return 0;
 488                 case -NFS4ERR_BADHANDLE:
 489                 case -ESTALE:
 490                         if (inode != NULL && S_ISREG(inode->i_mode))
 491                                 pnfs_destroy_layout(NFS_I(inode));
 492                         break;
 493                 case -NFS4ERR_DELEG_REVOKED:
 494                 case -NFS4ERR_ADMIN_REVOKED:
 495                 case -NFS4ERR_EXPIRED:
 496                 case -NFS4ERR_BAD_STATEID:
 497                 case -NFS4ERR_PARTNER_NO_AUTH:
 498                         if (inode != NULL && stateid != NULL) {
 499                                 nfs_inode_find_state_and_recover(inode,
 500                                                 stateid);
 501                                 goto wait_on_recovery;
 502                         }
 503                         fallthrough;
 504                 case -NFS4ERR_OPENMODE:
 505                         if (inode) {
 506                                 int err;
 507
 508                                 err = nfs_async_inode_return_delegation(inode,
 509                                                 stateid);
 510                                 if (err == 0)
 511                                         goto wait_on_recovery;
 512                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 513                                         exception->retry = 1;
 514                                         break;
 515                                 }
 516                         }
 517                         if (state == NULL)
 518                                 break;
 519                         ret = nfs4_schedule_stateid_recovery(server, state);
 520                         if (ret < 0)
 521                                 break;
 522                         goto wait_on_recovery;
 523                 case -NFS4ERR_STALE_STATEID:
 524                 case -NFS4ERR_STALE_CLIENTID:
 525                         nfs4_schedule_lease_recovery(clp);
 526                         goto wait_on_recovery;
 527                 case -NFS4ERR_MOVED:
 528                         ret = nfs4_schedule_migration_recovery(server);
 529                         if (ret < 0)
 530                                 break;
 531                         goto wait_on_recovery;
 532                 case -NFS4ERR_LEASE_MOVED:
 533                         nfs4_schedule_lease_moved_recovery(clp);
 534                         goto wait_on_recovery;
 535 #if defined(CONFIG_NFS_V4_1)
 536                 case -NFS4ERR_BADSESSION:
 537                 case -NFS4ERR_BADSLOT:
 538                 case -NFS4ERR_BAD_HIGH_SLOT:
 539                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 540                 case -NFS4ERR_DEADSESSION:
 541                 case -NFS4ERR_SEQ_FALSE_RETRY:
 542                 case -NFS4ERR_SEQ_MISORDERED:
 543                         /* Handled in nfs41_sequence_process() */
 544                         goto wait_on_recovery;
 545 #endif /* defined(CONFIG_NFS_V4_1) */
 546                 case -NFS4ERR_FILE_OPEN:
 547                         if (exception->timeout > HZ) {
 548                                 /* We have retried a decent amount, time to
 549                                  * fail
 550                                  */
 551                                 ret = -EBUSY;
 552                                 break;
 553                         }
 554                         fallthrough;
 555                 case -NFS4ERR_DELAY:
 556                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 557                         fallthrough;
 558                 case -NFS4ERR_GRACE:
 559                 case -NFS4ERR_LAYOUTTRYLATER:
 560                 case -NFS4ERR_RECALLCONFLICT:
 561                         exception->delay = 1;
 562                         return 0;
 563
 564                 case -NFS4ERR_RETRY_UNCACHED_REP:
 565                 case -NFS4ERR_OLD_STATEID:
 566                         exception->retry = 1;
 567                         break;
 568                 case -NFS4ERR_BADOWNER:
 569                         /* The following works around a Linux server bug! */
 570                 case -NFS4ERR_BADNAME:
 571                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 572                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 573                                 exception->retry = 1;
 574                                 printk(KERN_WARNING "NFS: v4 server %s "
 575                                                 "does not accept raw "
 576                                                 "uid/gids. "
 577                                                 "Reenabling the idmapper.\n",
 578                                                 server->nfs_client->cl_hostname);
 579                         }
 580         }
 581         /* We failed to handle the error */
 582         return nfs4_map_errors(ret);
 583 wait_on_recovery:
 584         exception->recovering = 1;
 585         return 0;
 586 }
 587
 588 /*
 589  * Track the number of NFS4ERR_DELAY related retransmissions and return
 590  * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
 591  * set by 'nfs_delay_retrans'.
 592  */
 593 static int nfs4_exception_should_retrans(const struct nfs_server *server,
 594                                          struct nfs4_exception *exception)
 595 {
 596         if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
 597                 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
 598                         return -EAGAIN;
 599         }
 600         return 0;
 601 }
 602
 603 /* This is the error handling routine for processes that are allowed
 604  * to sleep.
 605  */
 606 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 607 {
 608         struct nfs_client *clp = server->nfs_client;
 609         int ret;
 610
 611         ret = nfs4_do_handle_exception(server, errorcode, exception);
 612         if (exception->delay) {
 613                 int ret2 = nfs4_exception_should_retrans(server, exception);
 614                 if (ret2 < 0) {
 615                         exception->retry = 0;
 616                         return ret2;
 617                 }
 618                 ret = nfs4_delay(&exception->timeout,
 619                                 exception->interruptible);
 620                 goto out_retry;
 621         }
 622         if (exception->recovering) {
 623                 if (exception->task_is_privileged)
 624                         return -EDEADLOCK;
 625                 ret = nfs4_wait_clnt_recover(clp);
 626                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 627                         return -EIO;
 628                 goto out_retry;
 629         }
 630         return ret;
 631 out_retry:
 632         if (ret == 0)
 633                 exception->retry = 1;
 634         return ret;
 635 }
 636
 637 static int
 638 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 639                 int errorcode, struct nfs4_exception *exception)
 640 {
 641         struct nfs_client *clp = server->nfs_client;
 642         int ret;
 643
 644         ret = nfs4_do_handle_exception(server, errorcode, exception);
 645         if (exception->delay) {
 646                 int ret2 = nfs4_exception_should_retrans(server, exception);
 647                 if (ret2 < 0) {
 648                         exception->retry = 0;
 649                         return ret2;
 650                 }
 651                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 652                 goto out_retry;
 653         }
 654         if (exception->recovering) {
 655                 if (exception->task_is_privileged)
 656                         return -EDEADLOCK;
 657                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 658                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 659                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 660                 goto out_retry;
 661         }
 662         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 663                 ret = -EIO;
 664         return ret;
 665 out_retry:
 666         if (ret == 0) {
 667                 exception->retry = 1;
 668                 /*
 669                  * For NFS4ERR_MOVED, the client transport will need to
 670                  * be recomputed after migration recovery has completed.
 671                  */
 672                 if (errorcode == -NFS4ERR_MOVED)
 673                         rpc_task_release_transport(task);
 674         }
 675         return ret;
 676 }
 677
 678 int
 679 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 680                         struct nfs4_state *state, long *timeout)
 681 {
 682         struct nfs4_exception exception = {
 683                 .state = state,
 684         };
 685
 686         if (task->tk_status >= 0)
 687                 return 0;
 688         if (timeout)
 689                 exception.timeout = *timeout;
 690         task->tk_status = nfs4_async_handle_exception(task, server,
 691                         task->tk_status,
 692                         &exception);
 693         if (exception.delay && timeout)
 694                 *timeout = exception.timeout;
 695         if (exception.retry)
 696                 return -EAGAIN;
 697         return 0;
 698 }
 699
 700 /*
 701  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 702  * or 'false' otherwise.
 703  */
 704 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 705 {
 706         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 707         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 708 }
 709
 710 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 711 {
 712         spin_lock(&clp->cl_lock);
 713         if (time_before(clp->cl_last_renewal,timestamp))
 714                 clp->cl_last_renewal = timestamp;
 715         spin_unlock(&clp->cl_lock);
 716 }
 717
 718 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 719 {
 720         struct nfs_client *clp = server->nfs_client;
 721
 722         if (!nfs4_has_session(clp))
 723                 do_renew_lease(clp, timestamp);
 724 }
 725
 726 struct nfs4_call_sync_data {
 727         const struct nfs_server *seq_server;
 728         struct nfs4_sequence_args *seq_args;
 729         struct nfs4_sequence_res *seq_res;
 730 };
 731
 732 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 733                         struct nfs4_sequence_res *res, int cache_reply,
 734                         int privileged)
 735 {
 736         args->sa_slot = NULL;
 737         args->sa_cache_this = cache_reply;
 738         args->sa_privileged = privileged;
 739
 740         res->sr_slot = NULL;
 741 }
 742
 743 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 744 {
 745         struct nfs4_slot *slot = res->sr_slot;
 746         struct nfs4_slot_table *tbl;
 747
 748         tbl = slot->table;
 749         spin_lock(&tbl->slot_tbl_lock);
 750         if (!nfs41_wake_and_assign_slot(tbl, slot))
 751                 nfs4_free_slot(tbl, slot);
 752         spin_unlock(&tbl->slot_tbl_lock);
 753
 754         res->sr_slot = NULL;
 755 }
 756
 757 static int nfs40_sequence_done(struct rpc_task *task,
 758                                struct nfs4_sequence_res *res)
 759 {
 760         if (res->sr_slot != NULL)
 761                 nfs40_sequence_free_slot(res);
 762         return 1;
 763 }
 764
 765 #if defined(CONFIG_NFS_V4_1)
 766
 767 static void nfs41_release_slot(struct nfs4_slot *slot)
 768 {
 769         struct nfs4_session *session;
 770         struct nfs4_slot_table *tbl;
 771         bool send_new_highest_used_slotid = false;
 772
 773         if (!slot)
 774                 return;
 775         tbl = slot->table;
 776         session = tbl->session;
 777
 778         /* Bump the slot sequence number */
 779         if (slot->seq_done)
 780                 slot->seq_nr++;
 781         slot->seq_done = 0;
 782
 783         spin_lock(&tbl->slot_tbl_lock);
 784         /* Be nice to the server: try to ensure that the last transmitted
 785          * value for highest_user_slotid <= target_highest_slotid
 786          */
 787         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 788                 send_new_highest_used_slotid = true;
 789
 790         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 791                 send_new_highest_used_slotid = false;
 792                 goto out_unlock;
 793         }
 794         nfs4_free_slot(tbl, slot);
 795
 796         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 797                 send_new_highest_used_slotid = false;
 798 out_unlock:
 799         spin_unlock(&tbl->slot_tbl_lock);
 800         if (send_new_highest_used_slotid)
 801                 nfs41_notify_server(session->clp);
 802         if (waitqueue_active(&tbl->slot_waitq))
 803                 wake_up_all(&tbl->slot_waitq);
 804 }
 805
 806 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 807 {
 808         nfs41_release_slot(res->sr_slot);
 809         res->sr_slot = NULL;
 810 }
 811
 812 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 813                 u32 seqnr)
 814 {
 815         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 816                 slot->seq_nr_highest_sent = seqnr;
 817 }
 818 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 819 {
 820         nfs4_slot_sequence_record_sent(slot, seqnr);
 821         slot->seq_nr_last_acked = seqnr;
 822 }
 823
 824 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 825                                 struct nfs4_slot *slot)
 826 {
 827         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 828         if (!IS_ERR(task))
 829                 rpc_put_task_async(task);
 830 }
 831
 832 static int nfs41_sequence_process(struct rpc_task *task,
 833                 struct nfs4_sequence_res *res)
 834 {
 835         struct nfs4_session *session;
 836         struct nfs4_slot *slot = res->sr_slot;
 837         struct nfs_client *clp;
 838         int status;
 839         int ret = 1;
 840
 841         if (slot == NULL)
 842                 goto out_noaction;
 843         /* don't increment the sequence number if the task wasn't sent */
 844         if (!RPC_WAS_SENT(task) || slot->seq_done)
 845                 goto out;
 846
 847         session = slot->table->session;
 848         clp = session->clp;
 849
 850         trace_nfs4_sequence_done(session, res);
 851
 852         status = res->sr_status;
 853         if (task->tk_status == -NFS4ERR_DEADSESSION)
 854                 status = -NFS4ERR_DEADSESSION;
 855
 856         /* Check the SEQUENCE operation status */
 857         switch (status) {
 858         case 0:
 859                 /* Mark this sequence number as having been acked */
 860                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 861                 /* Update the slot's sequence and clientid lease timer */
 862                 slot->seq_done = 1;
 863                 do_renew_lease(clp, res->sr_timestamp);
 864                 /* Check sequence flags */
 865                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 866                                 !!slot->privileged);
 867                 nfs41_update_target_slotid(slot->table, slot, res);
 868                 break;
 869         case 1:
 870                 /*
 871                  * sr_status remains 1 if an RPC level error occurred.
 872                  * The server may or may not have processed the sequence
 873                  * operation..
 874                  */
 875                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 876                 slot->seq_done = 1;
 877                 goto out;
 878         case -NFS4ERR_DELAY:
 879                 /* The server detected a resend of the RPC call and
 880                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 881                  * of RFC5661.
 882                  */
 883                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 884                         __func__,
 885                         slot->slot_nr,
 886                         slot->seq_nr);
 887                 goto out_retry;
 888         case -NFS4ERR_RETRY_UNCACHED_REP:
 889         case -NFS4ERR_SEQ_FALSE_RETRY:
 890                 /*
 891                  * The server thinks we tried to replay a request.
 892                  * Retry the call after bumping the sequence ID.
 893                  */
 894                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 895                 goto retry_new_seq;
 896         case -NFS4ERR_BADSLOT:
 897                 /*
 898                  * The slot id we used was probably retired. Try again
 899                  * using a different slot id.
 900                  */
 901                 if (slot->slot_nr < slot->table->target_highest_slotid)
 902                         goto session_recover;
 903                 goto retry_nowait;
 904         case -NFS4ERR_SEQ_MISORDERED:
 905                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 906                 /*
 907                  * Were one or more calls using this slot interrupted?
 908                  * If the server never received the request, then our
 909                  * transmitted slot sequence number may be too high. However,
 910                  * if the server did receive the request then it might
 911                  * accidentally give us a reply with a mismatched operation.
 912                  * We can sort this out by sending a lone sequence operation
 913                  * to the server on the same slot.
 914                  */
 915                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 916                         slot->seq_nr--;
 917                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 918                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 919                                 res->sr_slot = NULL;
 920                         }
 921                         goto retry_nowait;
 922                 }
 923                 /*
 924                  * RFC5661:
 925                  * A retry might be sent while the original request is
 926                  * still in progress on the replier. The replier SHOULD
 927                  * deal with the issue by returning NFS4ERR_DELAY as the
 928                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 929                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 930                  *
 931                  * Restart the search after a delay.
 932                  */
 933                 slot->seq_nr = slot->seq_nr_highest_sent;
 934                 goto out_retry;
 935         case -NFS4ERR_BADSESSION:
 936         case -NFS4ERR_DEADSESSION:
 937         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 938                 goto session_recover;
 939         default:
 940                 /* Just update the slot sequence no. */
 941                 slot->seq_done = 1;
 942         }
 943 out:
 944         /* The session may be reset by one of the error handlers. */
 945         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 946 out_noaction:
 947         return ret;
 948 session_recover:
 949         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 950         nfs4_schedule_session_recovery(session, status);
 951         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 952         nfs41_sequence_free_slot(res);
 953         goto out;
 954 retry_new_seq:
 955         ++slot->seq_nr;
 956 retry_nowait:
 957         if (rpc_restart_call_prepare(task)) {
 958                 nfs41_sequence_free_slot(res);
 959                 task->tk_status = 0;
 960                 ret = 0;
 961         }
 962         goto out;
 963 out_retry:
 964         if (!rpc_restart_call(task))
 965                 goto out;
 966         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 967         return 0;
 968 }
 969
 970 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 971 {
 972         if (!nfs41_sequence_process(task, res))
 973                 return 0;
 974         if (res->sr_slot != NULL)
 975                 nfs41_sequence_free_slot(res);
 976         return 1;
 977
 978 }
 979 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 980
 981 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 982 {
 983         if (res->sr_slot == NULL)
 984                 return 1;
 985         if (res->sr_slot->table->session != NULL)
 986                 return nfs41_sequence_process(task, res);
 987         return nfs40_sequence_done(task, res);
 988 }
 989
 990 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 991 {
 992         if (res->sr_slot != NULL) {
 993                 if (res->sr_slot->table->session != NULL)
 994                         nfs41_sequence_free_slot(res);
 995                 else
 996                         nfs40_sequence_free_slot(res);
 997         }
 998 }
 999
1000 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1001 {
1002         if (res->sr_slot == NULL)
1003                 return 1;
1004         if (!res->sr_slot->table->session)
1005                 return nfs40_sequence_done(task, res);
1006         return nfs41_sequence_done(task, res);
1007 }
1008 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1009
1010 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1011 {
1012         struct nfs4_call_sync_data *data = calldata;
1013
1014         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1015
1016         nfs4_setup_sequence(data->seq_server->nfs_client,
1017                             data->seq_args, data->seq_res, task);
1018 }
1019
1020 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1021 {
1022         struct nfs4_call_sync_data *data = calldata;
1023
1024         nfs41_sequence_done(task, data->seq_res);
1025 }
1026
1027 static const struct rpc_call_ops nfs41_call_sync_ops = {
1028         .rpc_call_prepare = nfs41_call_sync_prepare,
1029         .rpc_call_done = nfs41_call_sync_done,
1030 };
1031
1032 #else   /* !CONFIG_NFS_V4_1 */
1033
1034 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1035 {
1036         return nfs40_sequence_done(task, res);
1037 }
1038
1039 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1040 {
1041         if (res->sr_slot != NULL)
1042                 nfs40_sequence_free_slot(res);
1043 }
1044
1045 int nfs4_sequence_done(struct rpc_task *task,
1046                        struct nfs4_sequence_res *res)
1047 {
1048         return nfs40_sequence_done(task, res);
1049 }
1050 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1051
1052 #endif  /* !CONFIG_NFS_V4_1 */
1053
1054 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1055 {
1056         res->sr_timestamp = jiffies;
1057         res->sr_status_flags = 0;
1058         res->sr_status = 1;
1059 }
1060
1061 static
1062 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1063                 struct nfs4_sequence_res *res,
1064                 struct nfs4_slot *slot)
1065 {
1066         if (!slot)
1067                 return;
1068         slot->privileged = args->sa_privileged ? 1 : 0;
1069         args->sa_slot = slot;
1070
1071         res->sr_slot = slot;
1072 }
1073
1074 int nfs4_setup_sequence(struct nfs_client *client,
1075                         struct nfs4_sequence_args *args,
1076                         struct nfs4_sequence_res *res,
1077                         struct rpc_task *task)
1078 {
1079         struct nfs4_session *session = nfs4_get_session(client);
1080         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1081         struct nfs4_slot *slot;
1082
1083         /* slot already allocated? */
1084         if (res->sr_slot != NULL)
1085                 goto out_start;
1086
1087         if (session)
1088                 tbl = &session->fc_slot_table;
1089
1090         spin_lock(&tbl->slot_tbl_lock);
1091         /* The state manager will wait until the slot table is empty */
1092         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1093                 goto out_sleep;
1094
1095         slot = nfs4_alloc_slot(tbl);
1096         if (IS_ERR(slot)) {
1097                 if (slot == ERR_PTR(-ENOMEM))
1098                         goto out_sleep_timeout;
1099                 goto out_sleep;
1100         }
1101         spin_unlock(&tbl->slot_tbl_lock);
1102
1103         nfs4_sequence_attach_slot(args, res, slot);
1104
1105         trace_nfs4_setup_sequence(session, args);
1106 out_start:
1107         nfs41_sequence_res_init(res);
1108         rpc_call_start(task);
1109         return 0;
1110 out_sleep_timeout:
1111         /* Try again in 1/4 second */
1112         if (args->sa_privileged)
1113                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1114                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1115         else
1116                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1117                                 NULL, jiffies + (HZ >> 2));
1118         spin_unlock(&tbl->slot_tbl_lock);
1119         return -EAGAIN;
1120 out_sleep:
1121         if (args->sa_privileged)
1122                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1123                                 RPC_PRIORITY_PRIVILEGED);
1124         else
1125                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1126         spin_unlock(&tbl->slot_tbl_lock);
1127         return -EAGAIN;
1128 }
1129 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1130
1131 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1132 {
1133         struct nfs4_call_sync_data *data = calldata;
1134         nfs4_setup_sequence(data->seq_server->nfs_client,
1135                                 data->seq_args, data->seq_res, task);
1136 }
1137
1138 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1139 {
1140         struct nfs4_call_sync_data *data = calldata;
1141         nfs4_sequence_done(task, data->seq_res);
1142 }
1143
1144 static const struct rpc_call_ops nfs40_call_sync_ops = {
1145         .rpc_call_prepare = nfs40_call_sync_prepare,
1146         .rpc_call_done = nfs40_call_sync_done,
1147 };
1148
1149 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1150 {
1151         int ret;
1152         struct rpc_task *task;
1153
1154         task = rpc_run_task(task_setup);
1155         if (IS_ERR(task))
1156                 return PTR_ERR(task);
1157
1158         ret = task->tk_status;
1159         rpc_put_task(task);
1160         return ret;
1161 }
1162
1163 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1164                              struct nfs_server *server,
1165                              struct rpc_message *msg,
1166                              struct nfs4_sequence_args *args,
1167                              struct nfs4_sequence_res *res,
1168                              unsigned short task_flags)
1169 {
1170         struct nfs_client *clp = server->nfs_client;
1171         struct nfs4_call_sync_data data = {
1172                 .seq_server = server,
1173                 .seq_args = args,
1174                 .seq_res = res,
1175         };
1176         struct rpc_task_setup task_setup = {
1177                 .rpc_client = clnt,
1178                 .rpc_message = msg,
1179                 .callback_ops = clp->cl_mvops->call_sync_ops,
1180                 .callback_data = &data,
1181                 .flags = task_flags,
1182         };
1183
1184         return nfs4_call_sync_custom(&task_setup);
1185 }
1186
1187 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1188                                    struct nfs_server *server,
1189                                    struct rpc_message *msg,
1190                                    struct nfs4_sequence_args *args,
1191                                    struct nfs4_sequence_res *res)
1192 {
1193         unsigned short task_flags = 0;
1194
1195         if (server->caps & NFS_CAP_MOVEABLE)
1196                 task_flags = RPC_TASK_MOVEABLE;
1197         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1198 }
1199
1200
1201 int nfs4_call_sync(struct rpc_clnt *clnt,
1202                    struct nfs_server *server,
1203                    struct rpc_message *msg,
1204                    struct nfs4_sequence_args *args,
1205                    struct nfs4_sequence_res *res,
1206                    int cache_reply)
1207 {
1208         nfs4_init_sequence(args, res, cache_reply, 0);
1209         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1210 }
1211
1212 static void
1213 nfs4_inc_nlink_locked(struct inode *inode)
1214 {
1215         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1216                                              NFS_INO_INVALID_CTIME |
1217                                              NFS_INO_INVALID_NLINK);
1218         inc_nlink(inode);
1219 }
1220
1221 static void
1222 nfs4_inc_nlink(struct inode *inode)
1223 {
1224         spin_lock(&inode->i_lock);
1225         nfs4_inc_nlink_locked(inode);
1226         spin_unlock(&inode->i_lock);
1227 }
1228
1229 static void
1230 nfs4_dec_nlink_locked(struct inode *inode)
1231 {
1232         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1233                                              NFS_INO_INVALID_CTIME |
1234                                              NFS_INO_INVALID_NLINK);
1235         drop_nlink(inode);
1236 }
1237
1238 static void
1239 nfs4_update_changeattr_locked(struct inode *inode,
1240                 struct nfs4_change_info *cinfo,
1241                 unsigned long timestamp, unsigned long cache_validity)
1242 {
1243         struct nfs_inode *nfsi = NFS_I(inode);
1244         u64 change_attr = inode_peek_iversion_raw(inode);
1245
1246         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1247         if (S_ISDIR(inode->i_mode))
1248                 cache_validity |= NFS_INO_INVALID_DATA;
1249
1250         switch (NFS_SERVER(inode)->change_attr_type) {
1251         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1252                 if (cinfo->after == change_attr)
1253                         goto out;
1254                 break;
1255         default:
1256                 if ((s64)(change_attr - cinfo->after) >= 0)
1257                         goto out;
1258         }
1259
1260         inode_set_iversion_raw(inode, cinfo->after);
1261         if (!cinfo->atomic || cinfo->before != change_attr) {
1262                 if (S_ISDIR(inode->i_mode))
1263                         nfs_force_lookup_revalidate(inode);
1264
1265                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1266                         cache_validity |=
1267                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1268                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1269                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1270                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1271                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1272         }
1273         nfsi->attrtimeo_timestamp = jiffies;
1274         nfsi->read_cache_jiffies = timestamp;
1275         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1276         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1277 out:
1278         nfs_set_cache_invalid(inode, cache_validity);
1279 }
1280
1281 void
1282 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1283                 unsigned long timestamp, unsigned long cache_validity)
1284 {
1285         spin_lock(&dir->i_lock);
1286         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1287         spin_unlock(&dir->i_lock);
1288 }
1289
1290 struct nfs4_open_createattrs {
1291         struct nfs4_label *label;
1292         struct iattr *sattr;
1293         const __u32 verf[2];
1294 };
1295
1296 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1297                 int err, struct nfs4_exception *exception)
1298 {
1299         if (err != -EINVAL)
1300                 return false;
1301         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1302                 return false;
1303         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1304         exception->retry = 1;
1305         return true;
1306 }
1307
1308 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1309 {
1310          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1311 }
1312
1313 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1314 {
1315         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1316
1317         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1318 }
1319
1320 static u32
1321 nfs4_map_atomic_open_share(struct nfs_server *server,
1322                 fmode_t fmode, int openflags)
1323 {
1324         u32 res = 0;
1325
1326         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1327         case FMODE_READ:
1328                 res = NFS4_SHARE_ACCESS_READ;
1329                 break;
1330         case FMODE_WRITE:
1331                 res = NFS4_SHARE_ACCESS_WRITE;
1332                 break;
1333         case FMODE_READ|FMODE_WRITE:
1334                 res = NFS4_SHARE_ACCESS_BOTH;
1335         }
1336         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1337                 goto out;
1338         /* Want no delegation if we're using O_DIRECT */
1339         if (openflags & O_DIRECT)
1340                 res |= NFS4_SHARE_WANT_NO_DELEG;
1341 out:
1342         return res;
1343 }
1344
1345 static enum open_claim_type4
1346 nfs4_map_atomic_open_claim(struct nfs_server *server,
1347                 enum open_claim_type4 claim)
1348 {
1349         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1350                 return claim;
1351         switch (claim) {
1352         default:
1353                 return claim;
1354         case NFS4_OPEN_CLAIM_FH:
1355                 return NFS4_OPEN_CLAIM_NULL;
1356         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1357                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1358         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1359                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1360         }
1361 }
1362
1363 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1364 {
1365         p->o_res.f_attr = &p->f_attr;
1366         p->o_res.seqid = p->o_arg.seqid;
1367         p->c_res.seqid = p->c_arg.seqid;
1368         p->o_res.server = p->o_arg.server;
1369         p->o_res.access_request = p->o_arg.access;
1370         nfs_fattr_init(&p->f_attr);
1371         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1372 }
1373
1374 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1375                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1376                 const struct nfs4_open_createattrs *c,
1377                 enum open_claim_type4 claim,
1378                 gfp_t gfp_mask)
1379 {
1380         struct dentry *parent = dget_parent(dentry);
1381         struct inode *dir = d_inode(parent);
1382         struct nfs_server *server = NFS_SERVER(dir);
1383         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1384         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1385         struct nfs4_opendata *p;
1386
1387         p = kzalloc(sizeof(*p), gfp_mask);
1388         if (p == NULL)
1389                 goto err;
1390
1391         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1392         if (IS_ERR(p->f_attr.label))
1393                 goto err_free_p;
1394
1395         p->a_label = nfs4_label_alloc(server, gfp_mask);
1396         if (IS_ERR(p->a_label))
1397                 goto err_free_f;
1398
1399         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1400         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1401         if (IS_ERR(p->o_arg.seqid))
1402                 goto err_free_label;
1403         nfs_sb_active(dentry->d_sb);
1404         p->dentry = dget(dentry);
1405         p->dir = parent;
1406         p->owner = sp;
1407         atomic_inc(&sp->so_count);
1408         p->o_arg.open_flags = flags;
1409         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1410         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1411         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1412                         fmode, flags);
1413         if (flags & O_CREAT) {
1414                 p->o_arg.umask = current_umask();
1415                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1416                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1417                         p->o_arg.u.attrs = &p->attrs;
1418                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1419
1420                         memcpy(p->o_arg.u.verifier.data, c->verf,
1421                                         sizeof(p->o_arg.u.verifier.data));
1422                 }
1423         }
1424         /* ask server to check for all possible rights as results
1425          * are cached */
1426         switch (p->o_arg.claim) {
1427         default:
1428                 break;
1429         case NFS4_OPEN_CLAIM_NULL:
1430         case NFS4_OPEN_CLAIM_FH:
1431                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1432                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1433                                   NFS4_ACCESS_EXECUTE |
1434                                   nfs_access_xattr_mask(server);
1435         }
1436         p->o_arg.clientid = server->nfs_client->cl_clientid;
1437         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1438         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1439         p->o_arg.name = &dentry->d_name;
1440         p->o_arg.server = server;
1441         p->o_arg.bitmask = nfs4_bitmask(server, label);
1442         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1443         switch (p->o_arg.claim) {
1444         case NFS4_OPEN_CLAIM_NULL:
1445         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1446         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1447                 p->o_arg.fh = NFS_FH(dir);
1448                 break;
1449         case NFS4_OPEN_CLAIM_PREVIOUS:
1450         case NFS4_OPEN_CLAIM_FH:
1451         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1452         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1453                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1454         }
1455         p->c_arg.fh = &p->o_res.fh;
1456         p->c_arg.stateid = &p->o_res.stateid;
1457         p->c_arg.seqid = p->o_arg.seqid;
1458         nfs4_init_opendata_res(p);
1459         kref_init(&p->kref);
1460         return p;
1461
1462 err_free_label:
1463         nfs4_label_free(p->a_label);
1464 err_free_f:
1465         nfs4_label_free(p->f_attr.label);
1466 err_free_p:
1467         kfree(p);
1468 err:
1469         dput(parent);
1470         return NULL;
1471 }
1472
1473 static void nfs4_opendata_free(struct kref *kref)
1474 {
1475         struct nfs4_opendata *p = container_of(kref,
1476                         struct nfs4_opendata, kref);
1477         struct super_block *sb = p->dentry->d_sb;
1478
1479         nfs4_lgopen_release(p->lgp);
1480         nfs_free_seqid(p->o_arg.seqid);
1481         nfs4_sequence_free_slot(&p->o_res.seq_res);
1482         if (p->state != NULL)
1483                 nfs4_put_open_state(p->state);
1484         nfs4_put_state_owner(p->owner);
1485
1486         nfs4_label_free(p->a_label);
1487         nfs4_label_free(p->f_attr.label);
1488
1489         dput(p->dir);
1490         dput(p->dentry);
1491         nfs_sb_deactive(sb);
1492         nfs_fattr_free_names(&p->f_attr);
1493         kfree(p->f_attr.mdsthreshold);
1494         kfree(p);
1495 }
1496
1497 static void nfs4_opendata_put(struct nfs4_opendata *p)
1498 {
1499         if (p != NULL)
1500                 kref_put(&p->kref, nfs4_opendata_free);
1501 }
1502
1503 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1504                 fmode_t fmode)
1505 {
1506         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1507         case FMODE_READ|FMODE_WRITE:
1508                 return state->n_rdwr != 0;
1509         case FMODE_WRITE:
1510                 return state->n_wronly != 0;
1511         case FMODE_READ:
1512                 return state->n_rdonly != 0;
1513         }
1514         WARN_ON_ONCE(1);
1515         return false;
1516 }
1517
1518 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1519                 int open_mode, enum open_claim_type4 claim)
1520 {
1521         int ret = 0;
1522
1523         if (open_mode & (O_EXCL|O_TRUNC))
1524                 goto out;
1525         switch (claim) {
1526         case NFS4_OPEN_CLAIM_NULL:
1527         case NFS4_OPEN_CLAIM_FH:
1528                 goto out;
1529         default:
1530                 break;
1531         }
1532         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1533                 case FMODE_READ:
1534                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1535                                 && state->n_rdonly != 0;
1536                         break;
1537                 case FMODE_WRITE:
1538                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1539                                 && state->n_wronly != 0;
1540                         break;
1541                 case FMODE_READ|FMODE_WRITE:
1542                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1543                                 && state->n_rdwr != 0;
1544         }
1545 out:
1546         return ret;
1547 }
1548
1549 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1550                 enum open_claim_type4 claim)
1551 {
1552         if (delegation == NULL)
1553                 return 0;
1554         if ((delegation->type & fmode) != fmode)
1555                 return 0;
1556         switch (claim) {
1557         case NFS4_OPEN_CLAIM_NULL:
1558         case NFS4_OPEN_CLAIM_FH:
1559                 break;
1560         case NFS4_OPEN_CLAIM_PREVIOUS:
1561                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1562                         break;
1563                 fallthrough;
1564         default:
1565                 return 0;
1566         }
1567         nfs_mark_delegation_referenced(delegation);
1568         return 1;
1569 }
1570
1571 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1572 {
1573         switch (fmode) {
1574                 case FMODE_WRITE:
1575                         state->n_wronly++;
1576                         break;
1577                 case FMODE_READ:
1578                         state->n_rdonly++;
1579                         break;
1580                 case FMODE_READ|FMODE_WRITE:
1581                         state->n_rdwr++;
1582         }
1583         nfs4_state_set_mode_locked(state, state->state | fmode);
1584 }
1585
1586 #ifdef CONFIG_NFS_V4_1
1587 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1588 {
1589         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1590                 return true;
1591         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1592                 return true;
1593         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1594                 return true;
1595         return false;
1596 }
1597 #endif /* CONFIG_NFS_V4_1 */
1598
1599 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1600 {
1601         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1602                 wake_up_all(&state->waitq);
1603 }
1604
1605 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1606 {
1607         struct nfs_client *clp = state->owner->so_server->nfs_client;
1608         bool need_recover = false;
1609
1610         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1611                 need_recover = true;
1612         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1613                 need_recover = true;
1614         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1615                 need_recover = true;
1616         if (need_recover)
1617                 nfs4_state_mark_reclaim_nograce(clp, state);
1618 }
1619
1620 /*
1621  * Check for whether or not the caller may update the open stateid
1622  * to the value passed in by stateid.
1623  *
1624  * Note: This function relies heavily on the server implementing
1625  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1626  * correctly.
1627  * i.e. The stateid seqids have to be initialised to 1, and
1628  * are then incremented on every state transition.
1629  */
1630 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1631                 const nfs4_stateid *stateid)
1632 {
1633         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1634                 /* The common case - we're updating to a new sequence number */
1635                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1636                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1637                                 return true;
1638                         return false;
1639                 }
1640                 /* The server returned a new stateid */
1641         }
1642         /* This is the first OPEN in this generation */
1643         if (stateid->seqid == cpu_to_be32(1))
1644                 return true;
1645         return false;
1646 }
1647
1648 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1649 {
1650         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1651                 return;
1652         if (state->n_wronly)
1653                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1654         if (state->n_rdonly)
1655                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1656         if (state->n_rdwr)
1657                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1658         set_bit(NFS_OPEN_STATE, &state->flags);
1659 }
1660
1661 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1662                 nfs4_stateid *stateid, fmode_t fmode)
1663 {
1664         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1665         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1666         case FMODE_WRITE:
1667                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1668                 break;
1669         case FMODE_READ:
1670                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1671                 break;
1672         case 0:
1673                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1674                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1675                 clear_bit(NFS_OPEN_STATE, &state->flags);
1676         }
1677         if (stateid == NULL)
1678                 return;
1679         /* Handle OPEN+OPEN_DOWNGRADE races */
1680         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1681             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1682                 nfs_resync_open_stateid_locked(state);
1683                 goto out;
1684         }
1685         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1686                 nfs4_stateid_copy(&state->stateid, stateid);
1687         nfs4_stateid_copy(&state->open_stateid, stateid);
1688         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1689 out:
1690         nfs_state_log_update_open_stateid(state);
1691 }
1692
1693 static void nfs_clear_open_stateid(struct nfs4_state *state,
1694         nfs4_stateid *arg_stateid,
1695         nfs4_stateid *stateid, fmode_t fmode)
1696 {
1697         write_seqlock(&state->seqlock);
1698         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1699         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1700                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1701         write_sequnlock(&state->seqlock);
1702         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1703                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1704 }
1705
1706 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1707                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1708         __must_hold(&state->owner->so_lock)
1709         __must_hold(&state->seqlock)
1710         __must_hold(RCU)
1711
1712 {
1713         DEFINE_WAIT(wait);
1714         int status = 0;
1715         for (;;) {
1716
1717                 if (nfs_stateid_is_sequential(state, stateid))
1718                         break;
1719
1720                 if (status)
1721                         break;
1722                 /* Rely on seqids for serialisation with NFSv4.0 */
1723                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1724                         break;
1725
1726                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1727                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1728                 /*
1729                  * Ensure we process the state changes in the same order
1730                  * in which the server processed them by delaying the
1731                  * update of the stateid until we are in sequence.
1732                  */
1733                 write_sequnlock(&state->seqlock);
1734                 spin_unlock(&state->owner->so_lock);
1735                 rcu_read_unlock();
1736                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1737
1738                 if (!fatal_signal_pending(current)) {
1739                         if (schedule_timeout(5*HZ) == 0)
1740                                 status = -EAGAIN;
1741                         else
1742                                 status = 0;
1743                 } else
1744                         status = -EINTR;
1745                 finish_wait(&state->waitq, &wait);
1746                 rcu_read_lock();
1747                 spin_lock(&state->owner->so_lock);
1748                 write_seqlock(&state->seqlock);
1749         }
1750
1751         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1752             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1753                 nfs4_stateid_copy(freeme, &state->open_stateid);
1754                 nfs_test_and_clear_all_open_stateid(state);
1755         }
1756
1757         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1758                 nfs4_stateid_copy(&state->stateid, stateid);
1759         nfs4_stateid_copy(&state->open_stateid, stateid);
1760         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1761         nfs_state_log_update_open_stateid(state);
1762 }
1763
1764 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1765                 const nfs4_stateid *open_stateid,
1766                 fmode_t fmode,
1767                 nfs4_stateid *freeme)
1768 {
1769         /*
1770          * Protect the call to nfs4_state_set_mode_locked and
1771          * serialise the stateid update
1772          */
1773         write_seqlock(&state->seqlock);
1774         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1775         switch (fmode) {
1776         case FMODE_READ:
1777                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1778                 break;
1779         case FMODE_WRITE:
1780                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1781                 break;
1782         case FMODE_READ|FMODE_WRITE:
1783                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1784         }
1785         set_bit(NFS_OPEN_STATE, &state->flags);
1786         write_sequnlock(&state->seqlock);
1787 }
1788
1789 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1790 {
1791         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1792         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1793         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1794         clear_bit(NFS_OPEN_STATE, &state->flags);
1795 }
1796
1797 static void nfs_state_set_delegation(struct nfs4_state *state,
1798                 const nfs4_stateid *deleg_stateid,
1799                 fmode_t fmode)
1800 {
1801         /*
1802          * Protect the call to nfs4_state_set_mode_locked and
1803          * serialise the stateid update
1804          */
1805         write_seqlock(&state->seqlock);
1806         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1807         set_bit(NFS_DELEGATED_STATE, &state->flags);
1808         write_sequnlock(&state->seqlock);
1809 }
1810
1811 static void nfs_state_clear_delegation(struct nfs4_state *state)
1812 {
1813         write_seqlock(&state->seqlock);
1814         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1815         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1816         write_sequnlock(&state->seqlock);
1817 }
1818
1819 int update_open_stateid(struct nfs4_state *state,
1820                 const nfs4_stateid *open_stateid,
1821                 const nfs4_stateid *delegation,
1822                 fmode_t fmode)
1823 {
1824         struct nfs_server *server = NFS_SERVER(state->inode);
1825         struct nfs_client *clp = server->nfs_client;
1826         struct nfs_inode *nfsi = NFS_I(state->inode);
1827         struct nfs_delegation *deleg_cur;
1828         nfs4_stateid freeme = { };
1829         int ret = 0;
1830
1831         fmode &= (FMODE_READ|FMODE_WRITE);
1832
1833         rcu_read_lock();
1834         spin_lock(&state->owner->so_lock);
1835         if (open_stateid != NULL) {
1836                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1837                 ret = 1;
1838         }
1839
1840         deleg_cur = nfs4_get_valid_delegation(state->inode);
1841         if (deleg_cur == NULL)
1842                 goto no_delegation;
1843
1844         spin_lock(&deleg_cur->lock);
1845         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1846            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1847             (deleg_cur->type & fmode) != fmode)
1848                 goto no_delegation_unlock;
1849
1850         if (delegation == NULL)
1851                 delegation = &deleg_cur->stateid;
1852         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1853                 goto no_delegation_unlock;
1854
1855         nfs_mark_delegation_referenced(deleg_cur);
1856         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1857         ret = 1;
1858 no_delegation_unlock:
1859         spin_unlock(&deleg_cur->lock);
1860 no_delegation:
1861         if (ret)
1862                 update_open_stateflags(state, fmode);
1863         spin_unlock(&state->owner->so_lock);
1864         rcu_read_unlock();
1865
1866         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1867                 nfs4_schedule_state_manager(clp);
1868         if (freeme.type != 0)
1869                 nfs4_test_and_free_stateid(server, &freeme,
1870                                 state->owner->so_cred);
1871
1872         return ret;
1873 }
1874
1875 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1876                 const nfs4_stateid *stateid)
1877 {
1878         struct nfs4_state *state = lsp->ls_state;
1879         bool ret = false;
1880
1881         spin_lock(&state->state_lock);
1882         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1883                 goto out_noupdate;
1884         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1885                 goto out_noupdate;
1886         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1887         ret = true;
1888 out_noupdate:
1889         spin_unlock(&state->state_lock);
1890         return ret;
1891 }
1892
1893 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1894 {
1895         struct nfs_delegation *delegation;
1896
1897         fmode &= FMODE_READ|FMODE_WRITE;
1898         rcu_read_lock();
1899         delegation = nfs4_get_valid_delegation(inode);
1900         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1901                 rcu_read_unlock();
1902                 return;
1903         }
1904         rcu_read_unlock();
1905         nfs4_inode_return_delegation(inode);
1906 }
1907
1908 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1909 {
1910         struct nfs4_state *state = opendata->state;
1911         struct nfs_delegation *delegation;
1912         int open_mode = opendata->o_arg.open_flags;
1913         fmode_t fmode = opendata->o_arg.fmode;
1914         enum open_claim_type4 claim = opendata->o_arg.claim;
1915         nfs4_stateid stateid;
1916         int ret = -EAGAIN;
1917
1918         for (;;) {
1919                 spin_lock(&state->owner->so_lock);
1920                 if (can_open_cached(state, fmode, open_mode, claim)) {
1921                         update_open_stateflags(state, fmode);
1922                         spin_unlock(&state->owner->so_lock);
1923                         goto out_return_state;
1924                 }
1925                 spin_unlock(&state->owner->so_lock);
1926                 rcu_read_lock();
1927                 delegation = nfs4_get_valid_delegation(state->inode);
1928                 if (!can_open_delegated(delegation, fmode, claim)) {
1929                         rcu_read_unlock();
1930                         break;
1931                 }
1932                 /* Save the delegation */
1933                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1934                 rcu_read_unlock();
1935                 nfs_release_seqid(opendata->o_arg.seqid);
1936                 if (!opendata->is_recover) {
1937                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1938                         if (ret != 0)
1939                                 goto out;
1940                 }
1941                 ret = -EAGAIN;
1942
1943                 /* Try to update the stateid using the delegation */
1944                 if (update_open_stateid(state, NULL, &stateid, fmode))
1945                         goto out_return_state;
1946         }
1947 out:
1948         return ERR_PTR(ret);
1949 out_return_state:
1950         refcount_inc(&state->count);
1951         return state;
1952 }
1953
1954 static void
1955 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1956 {
1957         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1958         struct nfs_delegation *delegation;
1959         int delegation_flags = 0;
1960
1961         rcu_read_lock();
1962         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1963         if (delegation)
1964                 delegation_flags = delegation->flags;
1965         rcu_read_unlock();
1966         switch (data->o_arg.claim) {
1967         default:
1968                 break;
1969         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1970         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1971                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1972                                    "returning a delegation for "
1973                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1974                                    clp->cl_hostname);
1975                 return;
1976         }
1977         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1978                 nfs_inode_set_delegation(state->inode,
1979                                 data->owner->so_cred,
1980                                 data->o_res.delegation_type,
1981                                 &data->o_res.delegation,
1982                                 data->o_res.pagemod_limit);
1983         else
1984                 nfs_inode_reclaim_delegation(state->inode,
1985                                 data->owner->so_cred,
1986                                 data->o_res.delegation_type,
1987                                 &data->o_res.delegation,
1988                                 data->o_res.pagemod_limit);
1989
1990         if (data->o_res.do_recall)
1991                 nfs_async_inode_return_delegation(state->inode,
1992                                                   &data->o_res.delegation);
1993 }
1994
1995 /*
1996  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1997  * and update the nfs4_state.
1998  */
1999 static struct nfs4_state *
2000 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2001 {
2002         struct inode *inode = data->state->inode;
2003         struct nfs4_state *state = data->state;
2004         int ret;
2005
2006         if (!data->rpc_done) {
2007                 if (data->rpc_status)
2008                         return ERR_PTR(data->rpc_status);
2009                 return nfs4_try_open_cached(data);
2010         }
2011
2012         ret = nfs_refresh_inode(inode, &data->f_attr);
2013         if (ret)
2014                 return ERR_PTR(ret);
2015
2016         if (data->o_res.delegation_type != 0)
2017                 nfs4_opendata_check_deleg(data, state);
2018
2019         if (!update_open_stateid(state, &data->o_res.stateid,
2020                                 NULL, data->o_arg.fmode))
2021                 return ERR_PTR(-EAGAIN);
2022         refcount_inc(&state->count);
2023
2024         return state;
2025 }
2026
2027 static struct inode *
2028 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2029 {
2030         struct inode *inode;
2031
2032         switch (data->o_arg.claim) {
2033         case NFS4_OPEN_CLAIM_NULL:
2034         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2035         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2036                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2037                         return ERR_PTR(-EAGAIN);
2038                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2039                                 &data->f_attr);
2040                 break;
2041         default:
2042                 inode = d_inode(data->dentry);
2043                 ihold(inode);
2044                 nfs_refresh_inode(inode, &data->f_attr);
2045         }
2046         return inode;
2047 }
2048
2049 static struct nfs4_state *
2050 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2051 {
2052         struct nfs4_state *state;
2053         struct inode *inode;
2054
2055         inode = nfs4_opendata_get_inode(data);
2056         if (IS_ERR(inode))
2057                 return ERR_CAST(inode);
2058         if (data->state != NULL && data->state->inode == inode) {
2059                 state = data->state;
2060                 refcount_inc(&state->count);
2061         } else
2062                 state = nfs4_get_open_state(inode, data->owner);
2063         iput(inode);
2064         if (state == NULL)
2065                 state = ERR_PTR(-ENOMEM);
2066         return state;
2067 }
2068
2069 static struct nfs4_state *
2070 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2071 {
2072         struct nfs4_state *state;
2073
2074         if (!data->rpc_done) {
2075                 state = nfs4_try_open_cached(data);
2076                 trace_nfs4_cached_open(data->state);
2077                 goto out;
2078         }
2079
2080         state = nfs4_opendata_find_nfs4_state(data);
2081         if (IS_ERR(state))
2082                 goto out;
2083
2084         if (data->o_res.delegation_type != 0)
2085                 nfs4_opendata_check_deleg(data, state);
2086         if (!update_open_stateid(state, &data->o_res.stateid,
2087                                 NULL, data->o_arg.fmode)) {
2088                 nfs4_put_open_state(state);
2089                 state = ERR_PTR(-EAGAIN);
2090         }
2091 out:
2092         nfs_release_seqid(data->o_arg.seqid);
2093         return state;
2094 }
2095
2096 static struct nfs4_state *
2097 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2098 {
2099         struct nfs4_state *ret;
2100
2101         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2102                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2103         else
2104                 ret = _nfs4_opendata_to_nfs4_state(data);
2105         nfs4_sequence_free_slot(&data->o_res.seq_res);
2106         return ret;
2107 }
2108
2109 static struct nfs_open_context *
2110 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2111 {
2112         struct nfs_inode *nfsi = NFS_I(state->inode);
2113         struct nfs_open_context *ctx;
2114
2115         rcu_read_lock();
2116         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2117                 if (ctx->state != state)
2118                         continue;
2119                 if ((ctx->mode & mode) != mode)
2120                         continue;
2121                 if (!get_nfs_open_context(ctx))
2122                         continue;
2123                 rcu_read_unlock();
2124                 return ctx;
2125         }
2126         rcu_read_unlock();
2127         return ERR_PTR(-ENOENT);
2128 }
2129
2130 static struct nfs_open_context *
2131 nfs4_state_find_open_context(struct nfs4_state *state)
2132 {
2133         struct nfs_open_context *ctx;
2134
2135         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2136         if (!IS_ERR(ctx))
2137                 return ctx;
2138         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2139         if (!IS_ERR(ctx))
2140                 return ctx;
2141         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2142 }
2143
2144 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2145                 struct nfs4_state *state, enum open_claim_type4 claim)
2146 {
2147         struct nfs4_opendata *opendata;
2148
2149         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2150                         NULL, claim, GFP_NOFS);
2151         if (opendata == NULL)
2152                 return ERR_PTR(-ENOMEM);
2153         opendata->state = state;
2154         refcount_inc(&state->count);
2155         return opendata;
2156 }
2157
2158 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2159                                     fmode_t fmode)
2160 {
2161         struct nfs4_state *newstate;
2162         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2163         int openflags = opendata->o_arg.open_flags;
2164         int ret;
2165
2166         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2167                 return 0;
2168         opendata->o_arg.fmode = fmode;
2169         opendata->o_arg.share_access =
2170                 nfs4_map_atomic_open_share(server, fmode, openflags);
2171         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2172         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2173         nfs4_init_opendata_res(opendata);
2174         ret = _nfs4_recover_proc_open(opendata);
2175         if (ret != 0)
2176                 return ret;
2177         newstate = nfs4_opendata_to_nfs4_state(opendata);
2178         if (IS_ERR(newstate))
2179                 return PTR_ERR(newstate);
2180         if (newstate != opendata->state)
2181                 ret = -ESTALE;
2182         nfs4_close_state(newstate, fmode);
2183         return ret;
2184 }
2185
2186 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2187 {
2188         int ret;
2189
2190         /* memory barrier prior to reading state->n_* */
2191         smp_rmb();
2192         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2193         if (ret != 0)
2194                 return ret;
2195         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2196         if (ret != 0)
2197                 return ret;
2198         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2199         if (ret != 0)
2200                 return ret;
2201         /*
2202          * We may have performed cached opens for all three recoveries.
2203          * Check if we need to update the current stateid.
2204          */
2205         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2206             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2207                 write_seqlock(&state->seqlock);
2208                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2209                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2210                 write_sequnlock(&state->seqlock);
2211         }
2212         return 0;
2213 }
2214
2215 /*
2216  * OPEN_RECLAIM:
2217  *      reclaim state on the server after a reboot.
2218  */
2219 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2220 {
2221         struct nfs_delegation *delegation;
2222         struct nfs4_opendata *opendata;
2223         fmode_t delegation_type = 0;
2224         int status;
2225
2226         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2227                         NFS4_OPEN_CLAIM_PREVIOUS);
2228         if (IS_ERR(opendata))
2229                 return PTR_ERR(opendata);
2230         rcu_read_lock();
2231         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2232         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2233                 delegation_type = delegation->type;
2234         rcu_read_unlock();
2235         opendata->o_arg.u.delegation_type = delegation_type;
2236         status = nfs4_open_recover(opendata, state);
2237         nfs4_opendata_put(opendata);
2238         return status;
2239 }
2240
2241 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2242 {
2243         struct nfs_server *server = NFS_SERVER(state->inode);
2244         struct nfs4_exception exception = { };
2245         int err;
2246         do {
2247                 err = _nfs4_do_open_reclaim(ctx, state);
2248                 trace_nfs4_open_reclaim(ctx, 0, err);
2249                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2250                         continue;
2251                 if (err != -NFS4ERR_DELAY)
2252                         break;
2253                 nfs4_handle_exception(server, err, &exception);
2254         } while (exception.retry);
2255         return err;
2256 }
2257
2258 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2259 {
2260         struct nfs_open_context *ctx;
2261         int ret;
2262
2263         ctx = nfs4_state_find_open_context(state);
2264         if (IS_ERR(ctx))
2265                 return -EAGAIN;
2266         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2267         nfs_state_clear_open_state_flags(state);
2268         ret = nfs4_do_open_reclaim(ctx, state);
2269         put_nfs_open_context(ctx);
2270         return ret;
2271 }
2272
2273 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2274 {
2275         switch (err) {
2276                 default:
2277                         printk(KERN_ERR "NFS: %s: unhandled error "
2278                                         "%d.\n", __func__, err);
2279                         fallthrough;
2280                 case 0:
2281                 case -ENOENT:
2282                 case -EAGAIN:
2283                 case -ESTALE:
2284                 case -ETIMEDOUT:
2285                         break;
2286                 case -NFS4ERR_BADSESSION:
2287                 case -NFS4ERR_BADSLOT:
2288                 case -NFS4ERR_BAD_HIGH_SLOT:
2289                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2290                 case -NFS4ERR_DEADSESSION:
2291                         return -EAGAIN;
2292                 case -NFS4ERR_STALE_CLIENTID:
2293                 case -NFS4ERR_STALE_STATEID:
2294                         /* Don't recall a delegation if it was lost */
2295                         nfs4_schedule_lease_recovery(server->nfs_client);
2296                         return -EAGAIN;
2297                 case -NFS4ERR_MOVED:
2298                         nfs4_schedule_migration_recovery(server);
2299                         return -EAGAIN;
2300                 case -NFS4ERR_LEASE_MOVED:
2301                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2302                         return -EAGAIN;
2303                 case -NFS4ERR_DELEG_REVOKED:
2304                 case -NFS4ERR_ADMIN_REVOKED:
2305                 case -NFS4ERR_EXPIRED:
2306                 case -NFS4ERR_BAD_STATEID:
2307                 case -NFS4ERR_OPENMODE:
2308                         nfs_inode_find_state_and_recover(state->inode,
2309                                         stateid);
2310                         nfs4_schedule_stateid_recovery(server, state);
2311                         return -EAGAIN;
2312                 case -NFS4ERR_DELAY:
2313                 case -NFS4ERR_GRACE:
2314                         ssleep(1);
2315                         return -EAGAIN;
2316                 case -ENOMEM:
2317                 case -NFS4ERR_DENIED:
2318                         if (fl) {
2319                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2320                                 if (lsp)
2321                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2322                         }
2323                         return 0;
2324         }
2325         return err;
2326 }
2327
2328 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2329                 struct nfs4_state *state, const nfs4_stateid *stateid)
2330 {
2331         struct nfs_server *server = NFS_SERVER(state->inode);
2332         struct nfs4_opendata *opendata;
2333         int err = 0;
2334
2335         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2336                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2337         if (IS_ERR(opendata))
2338                 return PTR_ERR(opendata);
2339         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2340         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2341                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2342                 if (err)
2343                         goto out;
2344         }
2345         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2346                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2347                 if (err)
2348                         goto out;
2349         }
2350         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2351                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2352                 if (err)
2353                         goto out;
2354         }
2355         nfs_state_clear_delegation(state);
2356 out:
2357         nfs4_opendata_put(opendata);
2358         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2359 }
2360
2361 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2362 {
2363         struct nfs4_opendata *data = calldata;
2364
2365         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2366                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2367 }
2368
2369 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2370 {
2371         struct nfs4_opendata *data = calldata;
2372
2373         nfs40_sequence_done(task, &data->c_res.seq_res);
2374
2375         data->rpc_status = task->tk_status;
2376         if (data->rpc_status == 0) {
2377                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2378                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2379                 renew_lease(data->o_res.server, data->timestamp);
2380                 data->rpc_done = true;
2381         }
2382 }
2383
2384 static void nfs4_open_confirm_release(void *calldata)
2385 {
2386         struct nfs4_opendata *data = calldata;
2387         struct nfs4_state *state = NULL;
2388
2389         /* If this request hasn't been cancelled, do nothing */
2390         if (!data->cancelled)
2391                 goto out_free;
2392         /* In case of error, no cleanup! */
2393         if (!data->rpc_done)
2394                 goto out_free;
2395         state = nfs4_opendata_to_nfs4_state(data);
2396         if (!IS_ERR(state))
2397                 nfs4_close_state(state, data->o_arg.fmode);
2398 out_free:
2399         nfs4_opendata_put(data);
2400 }
2401
2402 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2403         .rpc_call_prepare = nfs4_open_confirm_prepare,
2404         .rpc_call_done = nfs4_open_confirm_done,
2405         .rpc_release = nfs4_open_confirm_release,
2406 };
2407
2408 /*
2409  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2410  */
2411 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2412 {
2413         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2414         struct rpc_task *task;
2415         struct  rpc_message msg = {
2416                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2417                 .rpc_argp = &data->c_arg,
2418                 .rpc_resp = &data->c_res,
2419                 .rpc_cred = data->owner->so_cred,
2420         };
2421         struct rpc_task_setup task_setup_data = {
2422                 .rpc_client = server->client,
2423                 .rpc_message = &msg,
2424                 .callback_ops = &nfs4_open_confirm_ops,
2425                 .callback_data = data,
2426                 .workqueue = nfsiod_workqueue,
2427                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2428         };
2429         int status;
2430
2431         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2432                                 data->is_recover);
2433         kref_get(&data->kref);
2434         data->rpc_done = false;
2435         data->rpc_status = 0;
2436         data->timestamp = jiffies;
2437         task = rpc_run_task(&task_setup_data);
2438         if (IS_ERR(task))
2439                 return PTR_ERR(task);
2440         status = rpc_wait_for_completion_task(task);
2441         if (status != 0) {
2442                 data->cancelled = true;
2443                 smp_wmb();
2444         } else
2445                 status = data->rpc_status;
2446         rpc_put_task(task);
2447         return status;
2448 }
2449
2450 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2451 {
2452         struct nfs4_opendata *data = calldata;
2453         struct nfs4_state_owner *sp = data->owner;
2454         struct nfs_client *clp = sp->so_server->nfs_client;
2455         enum open_claim_type4 claim = data->o_arg.claim;
2456
2457         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2458                 goto out_wait;
2459         /*
2460          * Check if we still need to send an OPEN call, or if we can use
2461          * a delegation instead.
2462          */
2463         if (data->state != NULL) {
2464                 struct nfs_delegation *delegation;
2465
2466                 if (can_open_cached(data->state, data->o_arg.fmode,
2467                                         data->o_arg.open_flags, claim))
2468                         goto out_no_action;
2469                 rcu_read_lock();
2470                 delegation = nfs4_get_valid_delegation(data->state->inode);
2471                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2472                         goto unlock_no_action;
2473                 rcu_read_unlock();
2474         }
2475         /* Update client id. */
2476         data->o_arg.clientid = clp->cl_clientid;
2477         switch (claim) {
2478         default:
2479                 break;
2480         case NFS4_OPEN_CLAIM_PREVIOUS:
2481         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2482         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2483                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2484                 fallthrough;
2485         case NFS4_OPEN_CLAIM_FH:
2486                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2487         }
2488         data->timestamp = jiffies;
2489         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2490                                 &data->o_arg.seq_args,
2491                                 &data->o_res.seq_res,
2492                                 task) != 0)
2493                 nfs_release_seqid(data->o_arg.seqid);
2494
2495         /* Set the create mode (note dependency on the session type) */
2496         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2497         if (data->o_arg.open_flags & O_EXCL) {
2498                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2499                 if (clp->cl_mvops->minor_version == 0) {
2500                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2501                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2502                          * because ACCESS will return permission denied for
2503                          * all bits until close */
2504                         data->o_res.access_request = data->o_arg.access = 0;
2505                 } else if (nfs4_has_persistent_session(clp))
2506                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2507         }
2508         return;
2509 unlock_no_action:
2510         trace_nfs4_cached_open(data->state);
2511         rcu_read_unlock();
2512 out_no_action:
2513         task->tk_action = NULL;
2514 out_wait:
2515         nfs4_sequence_done(task, &data->o_res.seq_res);
2516 }
2517
2518 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2519 {
2520         struct nfs4_opendata *data = calldata;
2521
2522         data->rpc_status = task->tk_status;
2523
2524         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2525                 return;
2526
2527         if (task->tk_status == 0) {
2528                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2529                         switch (data->o_res.f_attr->mode & S_IFMT) {
2530                         case S_IFREG:
2531                                 break;
2532                         case S_IFLNK:
2533                                 data->rpc_status = -ELOOP;
2534                                 break;
2535                         case S_IFDIR:
2536                                 data->rpc_status = -EISDIR;
2537                                 break;
2538                         default:
2539                                 data->rpc_status = -ENOTDIR;
2540                         }
2541                 }
2542                 renew_lease(data->o_res.server, data->timestamp);
2543                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2544                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2545         }
2546         data->rpc_done = true;
2547 }
2548
2549 static void nfs4_open_release(void *calldata)
2550 {
2551         struct nfs4_opendata *data = calldata;
2552         struct nfs4_state *state = NULL;
2553
2554         /* If this request hasn't been cancelled, do nothing */
2555         if (!data->cancelled)
2556                 goto out_free;
2557         /* In case of error, no cleanup! */
2558         if (data->rpc_status != 0 || !data->rpc_done)
2559                 goto out_free;
2560         /* In case we need an open_confirm, no cleanup! */
2561         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2562                 goto out_free;
2563         state = nfs4_opendata_to_nfs4_state(data);
2564         if (!IS_ERR(state))
2565                 nfs4_close_state(state, data->o_arg.fmode);
2566 out_free:
2567         nfs4_opendata_put(data);
2568 }
2569
2570 static const struct rpc_call_ops nfs4_open_ops = {
2571         .rpc_call_prepare = nfs4_open_prepare,
2572         .rpc_call_done = nfs4_open_done,
2573         .rpc_release = nfs4_open_release,
2574 };
2575
2576 static int nfs4_run_open_task(struct nfs4_opendata *data,
2577                               struct nfs_open_context *ctx)
2578 {
2579         struct inode *dir = d_inode(data->dir);
2580         struct nfs_server *server = NFS_SERVER(dir);
2581         struct nfs_openargs *o_arg = &data->o_arg;
2582         struct nfs_openres *o_res = &data->o_res;
2583         struct rpc_task *task;
2584         struct rpc_message msg = {
2585                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2586                 .rpc_argp = o_arg,
2587                 .rpc_resp = o_res,
2588                 .rpc_cred = data->owner->so_cred,
2589         };
2590         struct rpc_task_setup task_setup_data = {
2591                 .rpc_client = server->client,
2592                 .rpc_message = &msg,
2593                 .callback_ops = &nfs4_open_ops,
2594                 .callback_data = data,
2595                 .workqueue = nfsiod_workqueue,
2596                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2597         };
2598         int status;
2599
2600         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2601                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2602
2603         kref_get(&data->kref);
2604         data->rpc_done = false;
2605         data->rpc_status = 0;
2606         data->cancelled = false;
2607         data->is_recover = false;
2608         if (!ctx) {
2609                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2610                 data->is_recover = true;
2611                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2612         } else {
2613                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2614                 pnfs_lgopen_prepare(data, ctx);
2615         }
2616         task = rpc_run_task(&task_setup_data);
2617         if (IS_ERR(task))
2618                 return PTR_ERR(task);
2619         status = rpc_wait_for_completion_task(task);
2620         if (status != 0) {
2621                 data->cancelled = true;
2622                 smp_wmb();
2623         } else
2624                 status = data->rpc_status;
2625         rpc_put_task(task);
2626
2627         return status;
2628 }
2629
2630 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2631 {
2632         struct inode *dir = d_inode(data->dir);
2633         struct nfs_openres *o_res = &data->o_res;
2634         int status;
2635
2636         status = nfs4_run_open_task(data, NULL);
2637         if (status != 0 || !data->rpc_done)
2638                 return status;
2639
2640         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2641
2642         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2643                 status = _nfs4_proc_open_confirm(data);
2644
2645         return status;
2646 }
2647
2648 /*
2649  * Additional permission checks in order to distinguish between an
2650  * open for read, and an open for execute. This works around the
2651  * fact that NFSv4 OPEN treats read and execute permissions as being
2652  * the same.
2653  * Note that in the non-execute case, we want to turn off permission
2654  * checking if we just created a new file (POSIX open() semantics).
2655  */
2656 static int nfs4_opendata_access(const struct cred *cred,
2657                                 struct nfs4_opendata *opendata,
2658                                 struct nfs4_state *state, fmode_t fmode)
2659 {
2660         struct nfs_access_entry cache;
2661         u32 mask, flags;
2662
2663         /* access call failed or for some reason the server doesn't
2664          * support any access modes -- defer access call until later */
2665         if (opendata->o_res.access_supported == 0)
2666                 return 0;
2667
2668         mask = 0;
2669         if (fmode & FMODE_EXEC) {
2670                 /* ONLY check for exec rights */
2671                 if (S_ISDIR(state->inode->i_mode))
2672                         mask = NFS4_ACCESS_LOOKUP;
2673                 else
2674                         mask = NFS4_ACCESS_EXECUTE;
2675         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2676                 mask = NFS4_ACCESS_READ;
2677
2678         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2679         nfs_access_add_cache(state->inode, &cache, cred);
2680
2681         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2682         if ((mask & ~cache.mask & flags) == 0)
2683                 return 0;
2684
2685         return -EACCES;
2686 }
2687
2688 /*
2689  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2690  */
2691 static int _nfs4_proc_open(struct nfs4_opendata *data,
2692                            struct nfs_open_context *ctx)
2693 {
2694         struct inode *dir = d_inode(data->dir);
2695         struct nfs_server *server = NFS_SERVER(dir);
2696         struct nfs_openargs *o_arg = &data->o_arg;
2697         struct nfs_openres *o_res = &data->o_res;
2698         int status;
2699
2700         status = nfs4_run_open_task(data, ctx);
2701         if (!data->rpc_done)
2702                 return status;
2703         if (status != 0) {
2704                 if (status == -NFS4ERR_BADNAME &&
2705                                 !(o_arg->open_flags & O_CREAT))
2706                         return -ENOENT;
2707                 return status;
2708         }
2709
2710         nfs_fattr_map_and_free_names(server, &data->f_attr);
2711
2712         if (o_arg->open_flags & O_CREAT) {
2713                 if (o_arg->open_flags & O_EXCL)
2714                         data->file_created = true;
2715                 else if (o_res->cinfo.before != o_res->cinfo.after)
2716                         data->file_created = true;
2717                 if (data->file_created ||
2718                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2719                         nfs4_update_changeattr(dir, &o_res->cinfo,
2720                                         o_res->f_attr->time_start,
2721                                         NFS_INO_INVALID_DATA);
2722         }
2723         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2724                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2725         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2726                 status = _nfs4_proc_open_confirm(data);
2727                 if (status != 0)
2728                         return status;
2729         }
2730         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2731                 struct nfs_fh *fh = &o_res->fh;
2732
2733                 nfs4_sequence_free_slot(&o_res->seq_res);
2734                 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2735                         fh = NFS_FH(d_inode(data->dentry));
2736                 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2737         }
2738         return 0;
2739 }
2740
2741 /*
2742  * OPEN_EXPIRED:
2743  *      reclaim state on the server after a network partition.
2744  *      Assumes caller holds the appropriate lock
2745  */
2746 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2747 {
2748         struct nfs4_opendata *opendata;
2749         int ret;
2750
2751         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2752         if (IS_ERR(opendata))
2753                 return PTR_ERR(opendata);
2754         /*
2755          * We're not recovering a delegation, so ask for no delegation.
2756          * Otherwise the recovery thread could deadlock with an outstanding
2757          * delegation return.
2758          */
2759         opendata->o_arg.open_flags = O_DIRECT;
2760         ret = nfs4_open_recover(opendata, state);
2761         if (ret == -ESTALE)
2762                 d_drop(ctx->dentry);
2763         nfs4_opendata_put(opendata);
2764         return ret;
2765 }
2766
2767 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2768 {
2769         struct nfs_server *server = NFS_SERVER(state->inode);
2770         struct nfs4_exception exception = { };
2771         int err;
2772
2773         do {
2774                 err = _nfs4_open_expired(ctx, state);
2775                 trace_nfs4_open_expired(ctx, 0, err);
2776                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2777                         continue;
2778                 switch (err) {
2779                 default:
2780                         goto out;
2781                 case -NFS4ERR_GRACE:
2782                 case -NFS4ERR_DELAY:
2783                         nfs4_handle_exception(server, err, &exception);
2784                         err = 0;
2785                 }
2786         } while (exception.retry);
2787 out:
2788         return err;
2789 }
2790
2791 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2792 {
2793         struct nfs_open_context *ctx;
2794         int ret;
2795
2796         ctx = nfs4_state_find_open_context(state);
2797         if (IS_ERR(ctx))
2798                 return -EAGAIN;
2799         ret = nfs4_do_open_expired(ctx, state);
2800         put_nfs_open_context(ctx);
2801         return ret;
2802 }
2803
2804 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2805                 const nfs4_stateid *stateid)
2806 {
2807         nfs_remove_bad_delegation(state->inode, stateid);
2808         nfs_state_clear_delegation(state);
2809 }
2810
2811 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2812 {
2813         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2814                 nfs_finish_clear_delegation_stateid(state, NULL);
2815 }
2816
2817 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2818 {
2819         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2820         nfs40_clear_delegation_stateid(state);
2821         nfs_state_clear_open_state_flags(state);
2822         return nfs4_open_expired(sp, state);
2823 }
2824
2825 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2826                 nfs4_stateid *stateid,
2827                 const struct cred *cred)
2828 {
2829         return -NFS4ERR_BAD_STATEID;
2830 }
2831
2832 #if defined(CONFIG_NFS_V4_1)
2833 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2834                 nfs4_stateid *stateid,
2835                 const struct cred *cred)
2836 {
2837         int status;
2838
2839         switch (stateid->type) {
2840         default:
2841                 break;
2842         case NFS4_INVALID_STATEID_TYPE:
2843         case NFS4_SPECIAL_STATEID_TYPE:
2844                 return -NFS4ERR_BAD_STATEID;
2845         case NFS4_REVOKED_STATEID_TYPE:
2846                 goto out_free;
2847         }
2848
2849         status = nfs41_test_stateid(server, stateid, cred);
2850         switch (status) {
2851         case -NFS4ERR_EXPIRED:
2852         case -NFS4ERR_ADMIN_REVOKED:
2853         case -NFS4ERR_DELEG_REVOKED:
2854                 break;
2855         default:
2856                 return status;
2857         }
2858 out_free:
2859         /* Ack the revoked state to the server */
2860         nfs41_free_stateid(server, stateid, cred, true);
2861         return -NFS4ERR_EXPIRED;
2862 }
2863
2864 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2865 {
2866         struct nfs_server *server = NFS_SERVER(state->inode);
2867         nfs4_stateid stateid;
2868         struct nfs_delegation *delegation;
2869         const struct cred *cred = NULL;
2870         int status, ret = NFS_OK;
2871
2872         /* Get the delegation credential for use by test/free_stateid */
2873         rcu_read_lock();
2874         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2875         if (delegation == NULL) {
2876                 rcu_read_unlock();
2877                 nfs_state_clear_delegation(state);
2878                 return NFS_OK;
2879         }
2880
2881         spin_lock(&delegation->lock);
2882         nfs4_stateid_copy(&stateid, &delegation->stateid);
2883
2884         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2885                                 &delegation->flags)) {
2886                 spin_unlock(&delegation->lock);
2887                 rcu_read_unlock();
2888                 return NFS_OK;
2889         }
2890
2891         if (delegation->cred)
2892                 cred = get_cred(delegation->cred);
2893         spin_unlock(&delegation->lock);
2894         rcu_read_unlock();
2895         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2896         trace_nfs4_test_delegation_stateid(state, NULL, status);
2897         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2898                 nfs_finish_clear_delegation_stateid(state, &stateid);
2899         else
2900                 ret = status;
2901
2902         put_cred(cred);
2903         return ret;
2904 }
2905
2906 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2907 {
2908         nfs4_stateid tmp;
2909
2910         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2911             nfs4_copy_delegation_stateid(state->inode, state->state,
2912                                 &tmp, NULL) &&
2913             nfs4_stateid_match_other(&state->stateid, &tmp))
2914                 nfs_state_set_delegation(state, &tmp, state->state);
2915         else
2916                 nfs_state_clear_delegation(state);
2917 }
2918
2919 /**
2920  * nfs41_check_expired_locks - possibly free a lock stateid
2921  *
2922  * @state: NFSv4 state for an inode
2923  *
2924  * Returns NFS_OK if recovery for this stateid is now finished.
2925  * Otherwise a negative NFS4ERR value is returned.
2926  */
2927 static int nfs41_check_expired_locks(struct nfs4_state *state)
2928 {
2929         int status, ret = NFS_OK;
2930         struct nfs4_lock_state *lsp, *prev = NULL;
2931         struct nfs_server *server = NFS_SERVER(state->inode);
2932
2933         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2934                 goto out;
2935
2936         spin_lock(&state->state_lock);
2937         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2938                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2939                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2940
2941                         refcount_inc(&lsp->ls_count);
2942                         spin_unlock(&state->state_lock);
2943
2944                         nfs4_put_lock_state(prev);
2945                         prev = lsp;
2946
2947                         status = nfs41_test_and_free_expired_stateid(server,
2948                                         &lsp->ls_stateid,
2949                                         cred);
2950                         trace_nfs4_test_lock_stateid(state, lsp, status);
2951                         if (status == -NFS4ERR_EXPIRED ||
2952                             status == -NFS4ERR_BAD_STATEID) {
2953                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2954                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2955                                 if (!recover_lost_locks)
2956                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2957                         } else if (status != NFS_OK) {
2958                                 ret = status;
2959                                 nfs4_put_lock_state(prev);
2960                                 goto out;
2961                         }
2962                         spin_lock(&state->state_lock);
2963                 }
2964         }
2965         spin_unlock(&state->state_lock);
2966         nfs4_put_lock_state(prev);
2967 out:
2968         return ret;
2969 }
2970
2971 /**
2972  * nfs41_check_open_stateid - possibly free an open stateid
2973  *
2974  * @state: NFSv4 state for an inode
2975  *
2976  * Returns NFS_OK if recovery for this stateid is now finished.
2977  * Otherwise a negative NFS4ERR value is returned.
2978  */
2979 static int nfs41_check_open_stateid(struct nfs4_state *state)
2980 {
2981         struct nfs_server *server = NFS_SERVER(state->inode);
2982         nfs4_stateid *stateid = &state->open_stateid;
2983         const struct cred *cred = state->owner->so_cred;
2984         int status;
2985
2986         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2987                 return -NFS4ERR_BAD_STATEID;
2988         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2989         trace_nfs4_test_open_stateid(state, NULL, status);
2990         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2991                 nfs_state_clear_open_state_flags(state);
2992                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2993                 return status;
2994         }
2995         if (nfs_open_stateid_recover_openmode(state))
2996                 return -NFS4ERR_OPENMODE;
2997         return NFS_OK;
2998 }
2999
3000 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3001 {
3002         int status;
3003
3004         status = nfs41_check_delegation_stateid(state);
3005         if (status != NFS_OK)
3006                 return status;
3007         nfs41_delegation_recover_stateid(state);
3008
3009         status = nfs41_check_expired_locks(state);
3010         if (status != NFS_OK)
3011                 return status;
3012         status = nfs41_check_open_stateid(state);
3013         if (status != NFS_OK)
3014                 status = nfs4_open_expired(sp, state);
3015         return status;
3016 }
3017 #endif
3018
3019 /*
3020  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3021  * fields corresponding to attributes that were used to store the verifier.
3022  * Make sure we clobber those fields in the later setattr call
3023  */
3024 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3025                                 struct iattr *sattr, struct nfs4_label **label)
3026 {
3027         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3028         __u32 attrset[3];
3029         unsigned ret;
3030         unsigned i;
3031
3032         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3033                 attrset[i] = opendata->o_res.attrset[i];
3034                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3035                         attrset[i] &= ~bitmask[i];
3036         }
3037
3038         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3039                 sattr->ia_valid : 0;
3040
3041         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3042                 if (sattr->ia_valid & ATTR_ATIME_SET)
3043                         ret |= ATTR_ATIME_SET;
3044                 else
3045                         ret |= ATTR_ATIME;
3046         }
3047
3048         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3049                 if (sattr->ia_valid & ATTR_MTIME_SET)
3050                         ret |= ATTR_MTIME_SET;
3051                 else
3052                         ret |= ATTR_MTIME;
3053         }
3054
3055         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3056                 *label = NULL;
3057         return ret;
3058 }
3059
3060 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3061                 struct nfs_open_context *ctx)
3062 {
3063         struct nfs4_state_owner *sp = opendata->owner;
3064         struct nfs_server *server = sp->so_server;
3065         struct dentry *dentry;
3066         struct nfs4_state *state;
3067         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3068         struct inode *dir = d_inode(opendata->dir);
3069         unsigned long dir_verifier;
3070         unsigned int seq;
3071         int ret;
3072
3073         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3074         dir_verifier = nfs_save_change_attribute(dir);
3075
3076         ret = _nfs4_proc_open(opendata, ctx);
3077         if (ret != 0)
3078                 goto out;
3079
3080         state = _nfs4_opendata_to_nfs4_state(opendata);
3081         ret = PTR_ERR(state);
3082         if (IS_ERR(state))
3083                 goto out;
3084         ctx->state = state;
3085         if (server->caps & NFS_CAP_POSIX_LOCK)
3086                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3087         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3088                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3089         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3090                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3091
3092         dentry = opendata->dentry;
3093         if (d_really_is_negative(dentry)) {
3094                 struct dentry *alias;
3095                 d_drop(dentry);
3096                 alias = d_exact_alias(dentry, state->inode);
3097                 if (!alias)
3098                         alias = d_splice_alias(igrab(state->inode), dentry);
3099                 /* d_splice_alias() can't fail here - it's a non-directory */
3100                 if (alias) {
3101                         dput(ctx->dentry);
3102                         ctx->dentry = dentry = alias;
3103                 }
3104         }
3105
3106         switch(opendata->o_arg.claim) {
3107         default:
3108                 break;
3109         case NFS4_OPEN_CLAIM_NULL:
3110         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3111         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3112                 if (!opendata->rpc_done)
3113                         break;
3114                 if (opendata->o_res.delegation_type != 0)
3115                         dir_verifier = nfs_save_change_attribute(dir);
3116                 nfs_set_verifier(dentry, dir_verifier);
3117         }
3118
3119         /* Parse layoutget results before we check for access */
3120         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3121
3122         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3123         if (ret != 0)
3124                 goto out;
3125
3126         if (d_inode(dentry) == state->inode) {
3127                 nfs_inode_attach_open_context(ctx);
3128                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3129                         nfs4_schedule_stateid_recovery(server, state);
3130         }
3131
3132 out:
3133         if (!opendata->cancelled) {
3134                 if (opendata->lgp) {
3135                         nfs4_lgopen_release(opendata->lgp);
3136                         opendata->lgp = NULL;
3137                 }
3138                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3139         }
3140         return ret;
3141 }
3142
3143 /*
3144  * Returns a referenced nfs4_state
3145  */
3146 static int _nfs4_do_open(struct inode *dir,
3147                         struct nfs_open_context *ctx,
3148                         int flags,
3149                         const struct nfs4_open_createattrs *c,
3150                         int *opened)
3151 {
3152         struct nfs4_state_owner  *sp;
3153         struct nfs4_state     *state = NULL;
3154         struct nfs_server       *server = NFS_SERVER(dir);
3155         struct nfs4_opendata *opendata;
3156         struct dentry *dentry = ctx->dentry;
3157         const struct cred *cred = ctx->cred;
3158         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3159         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3160         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3161         struct iattr *sattr = c->sattr;
3162         struct nfs4_label *label = c->label;
3163         int status;
3164
3165         /* Protect against reboot recovery conflicts */
3166         status = -ENOMEM;
3167         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3168         if (sp == NULL) {
3169                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3170                 goto out_err;
3171         }
3172         status = nfs4_client_recover_expired_lease(server->nfs_client);
3173         if (status != 0)
3174                 goto err_put_state_owner;
3175         if (d_really_is_positive(dentry))
3176                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3177         status = -ENOMEM;
3178         if (d_really_is_positive(dentry))
3179                 claim = NFS4_OPEN_CLAIM_FH;
3180         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3181                         c, claim, GFP_KERNEL);
3182         if (opendata == NULL)
3183                 goto err_put_state_owner;
3184
3185         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3186                 if (!opendata->f_attr.mdsthreshold) {
3187                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3188                         if (!opendata->f_attr.mdsthreshold)
3189                                 goto err_opendata_put;
3190                 }
3191                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3192         }
3193         if (d_really_is_positive(dentry))
3194                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3195
3196         status = _nfs4_open_and_get_state(opendata, ctx);
3197         if (status != 0)
3198                 goto err_opendata_put;
3199         state = ctx->state;
3200
3201         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3202             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3203                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3204                 /*
3205                  * send create attributes which was not set by open
3206                  * with an extra setattr.
3207                  */
3208                 if (attrs || label) {
3209                         unsigned ia_old = sattr->ia_valid;
3210
3211                         sattr->ia_valid = attrs;
3212                         nfs_fattr_init(opendata->o_res.f_attr);
3213                         status = nfs4_do_setattr(state->inode, cred,
3214                                         opendata->o_res.f_attr, sattr,
3215                                         ctx, label);
3216                         if (status == 0) {
3217                                 nfs_setattr_update_inode(state->inode, sattr,
3218                                                 opendata->o_res.f_attr);
3219                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3220                         }
3221                         sattr->ia_valid = ia_old;
3222                 }
3223         }
3224         if (opened && opendata->file_created)
3225                 *opened = 1;
3226
3227         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3228                 *ctx_th = opendata->f_attr.mdsthreshold;
3229                 opendata->f_attr.mdsthreshold = NULL;
3230         }
3231
3232         nfs4_opendata_put(opendata);
3233         nfs4_put_state_owner(sp);
3234         return 0;
3235 err_opendata_put:
3236         nfs4_opendata_put(opendata);
3237 err_put_state_owner:
3238         nfs4_put_state_owner(sp);
3239 out_err:
3240         return status;
3241 }
3242
3243
3244 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3245                                         struct nfs_open_context *ctx,
3246                                         int flags,
3247                                         struct iattr *sattr,
3248                                         struct nfs4_label *label,
3249                                         int *opened)
3250 {
3251         struct nfs_server *server = NFS_SERVER(dir);
3252         struct nfs4_exception exception = {
3253                 .interruptible = true,
3254         };
3255         struct nfs4_state *res;
3256         struct nfs4_open_createattrs c = {
3257                 .label = label,
3258                 .sattr = sattr,
3259                 .verf = {
3260                         [0] = (__u32)jiffies,
3261                         [1] = (__u32)current->pid,
3262                 },
3263         };
3264         int status;
3265
3266         do {
3267                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3268                 res = ctx->state;
3269                 trace_nfs4_open_file(ctx, flags, status);
3270                 if (status == 0)
3271                         break;
3272                 /* NOTE: BAD_SEQID means the server and client disagree about the
3273                  * book-keeping w.r.t. state-changing operations
3274                  * (OPEN/CLOSE/LOCK/LOCKU...)
3275                  * It is actually a sign of a bug on the client or on the server.
3276                  *
3277                  * If we receive a BAD_SEQID error in the particular case of
3278                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3279                  * have unhashed the old state_owner for us, and that we can
3280                  * therefore safely retry using a new one. We should still warn
3281                  * the user though...
3282                  */
3283                 if (status == -NFS4ERR_BAD_SEQID) {
3284                         pr_warn_ratelimited("NFS: v4 server %s "
3285                                         " returned a bad sequence-id error!\n",
3286                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3287                         exception.retry = 1;
3288                         continue;
3289                 }
3290                 /*
3291                  * BAD_STATEID on OPEN means that the server cancelled our
3292                  * state before it received the OPEN_CONFIRM.
3293                  * Recover by retrying the request as per the discussion
3294                  * on Page 181 of RFC3530.
3295                  */
3296                 if (status == -NFS4ERR_BAD_STATEID) {
3297                         exception.retry = 1;
3298                         continue;
3299                 }
3300                 if (status == -NFS4ERR_EXPIRED) {
3301                         nfs4_schedule_lease_recovery(server->nfs_client);
3302                         exception.retry = 1;
3303                         continue;
3304                 }
3305                 if (status == -EAGAIN) {
3306                         /* We must have found a delegation */
3307                         exception.retry = 1;
3308                         continue;
3309                 }
3310                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3311                         continue;
3312                 res = ERR_PTR(nfs4_handle_exception(server,
3313                                         status, &exception));
3314         } while (exception.retry);
3315         return res;
3316 }
3317
3318 static int _nfs4_do_setattr(struct inode *inode,
3319                             struct nfs_setattrargs *arg,
3320                             struct nfs_setattrres *res,
3321                             const struct cred *cred,
3322                             struct nfs_open_context *ctx)
3323 {
3324         struct nfs_server *server = NFS_SERVER(inode);
3325         struct rpc_message msg = {
3326                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3327                 .rpc_argp       = arg,
3328                 .rpc_resp       = res,
3329                 .rpc_cred       = cred,
3330         };
3331         const struct cred *delegation_cred = NULL;
3332         unsigned long timestamp = jiffies;
3333         bool truncate;
3334         int status;
3335
3336         nfs_fattr_init(res->fattr);
3337
3338         /* Servers should only apply open mode checks for file size changes */
3339         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3340         if (!truncate) {
3341                 nfs4_inode_make_writeable(inode);
3342                 goto zero_stateid;
3343         }
3344
3345         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3346                 /* Use that stateid */
3347         } else if (ctx != NULL && ctx->state) {
3348                 struct nfs_lock_context *l_ctx;
3349                 if (!nfs4_valid_open_stateid(ctx->state))
3350                         return -EBADF;
3351                 l_ctx = nfs_get_lock_context(ctx);
3352                 if (IS_ERR(l_ctx))
3353                         return PTR_ERR(l_ctx);
3354                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3355                                                 &arg->stateid, &delegation_cred);
3356                 nfs_put_lock_context(l_ctx);
3357                 if (status == -EIO)
3358                         return -EBADF;
3359                 else if (status == -EAGAIN)
3360                         goto zero_stateid;
3361         } else {
3362 zero_stateid:
3363                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3364         }
3365         if (delegation_cred)
3366                 msg.rpc_cred = delegation_cred;
3367
3368         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3369
3370         put_cred(delegation_cred);
3371         if (status == 0 && ctx != NULL)
3372                 renew_lease(server, timestamp);
3373         trace_nfs4_setattr(inode, &arg->stateid, status);
3374         return status;
3375 }
3376
3377 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3378                            struct nfs_fattr *fattr, struct iattr *sattr,
3379                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3380 {
3381         struct nfs_server *server = NFS_SERVER(inode);
3382         __u32 bitmask[NFS4_BITMASK_SZ];
3383         struct nfs4_state *state = ctx ? ctx->state : NULL;
3384         struct nfs_setattrargs  arg = {
3385                 .fh             = NFS_FH(inode),
3386                 .iap            = sattr,
3387                 .server         = server,
3388                 .bitmask = bitmask,
3389                 .label          = ilabel,
3390         };
3391         struct nfs_setattrres  res = {
3392                 .fattr          = fattr,
3393                 .server         = server,
3394         };
3395         struct nfs4_exception exception = {
3396                 .state = state,
3397                 .inode = inode,
3398                 .stateid = &arg.stateid,
3399         };
3400         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3401         int err;
3402
3403         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3404                 adjust_flags |= NFS_INO_INVALID_MODE;
3405         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3406                 adjust_flags |= NFS_INO_INVALID_OTHER;
3407
3408         do {
3409                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3410                                         inode, adjust_flags);
3411
3412                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3413                 switch (err) {
3414                 case -NFS4ERR_OPENMODE:
3415                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3416                                 pr_warn_once("NFSv4: server %s is incorrectly "
3417                                                 "applying open mode checks to "
3418                                                 "a SETATTR that is not "
3419                                                 "changing file size.\n",
3420                                                 server->nfs_client->cl_hostname);
3421                         }
3422                         if (state && !(state->state & FMODE_WRITE)) {
3423                                 err = -EBADF;
3424                                 if (sattr->ia_valid & ATTR_OPEN)
3425                                         err = -EACCES;
3426                                 goto out;
3427                         }
3428                 }
3429                 err = nfs4_handle_exception(server, err, &exception);
3430         } while (exception.retry);
3431 out:
3432         return err;
3433 }
3434
3435 static bool
3436 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3437 {
3438         if (inode == NULL || !nfs_have_layout(inode))
3439                 return false;
3440
3441         return pnfs_wait_on_layoutreturn(inode, task);
3442 }
3443
3444 /*
3445  * Update the seqid of an open stateid
3446  */
3447 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3448                 struct nfs4_state *state)
3449 {
3450         __be32 seqid_open;
3451         u32 dst_seqid;
3452         int seq;
3453
3454         for (;;) {
3455                 if (!nfs4_valid_open_stateid(state))
3456                         break;
3457                 seq = read_seqbegin(&state->seqlock);
3458                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3459                         nfs4_stateid_copy(dst, &state->open_stateid);
3460                         if (read_seqretry(&state->seqlock, seq))
3461                                 continue;
3462                         break;
3463                 }
3464                 seqid_open = state->open_stateid.seqid;
3465                 if (read_seqretry(&state->seqlock, seq))
3466                         continue;
3467
3468                 dst_seqid = be32_to_cpu(dst->seqid);
3469                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3470                         dst->seqid = seqid_open;
3471                 break;
3472         }
3473 }
3474
3475 /*
3476  * Update the seqid of an open stateid after receiving
3477  * NFS4ERR_OLD_STATEID
3478  */
3479 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3480                 struct nfs4_state *state)
3481 {
3482         __be32 seqid_open;
3483         u32 dst_seqid;
3484         bool ret;
3485         int seq, status = -EAGAIN;
3486         DEFINE_WAIT(wait);
3487
3488         for (;;) {
3489                 ret = false;
3490                 if (!nfs4_valid_open_stateid(state))
3491                         break;
3492                 seq = read_seqbegin(&state->seqlock);
3493                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3494                         if (read_seqretry(&state->seqlock, seq))
3495                                 continue;
3496                         break;
3497                 }
3498
3499                 write_seqlock(&state->seqlock);
3500                 seqid_open = state->open_stateid.seqid;
3501
3502                 dst_seqid = be32_to_cpu(dst->seqid);
3503
3504                 /* Did another OPEN bump the state's seqid?  try again: */
3505                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3506                         dst->seqid = seqid_open;
3507                         write_sequnlock(&state->seqlock);
3508                         ret = true;
3509                         break;
3510                 }
3511
3512                 /* server says we're behind but we haven't seen the update yet */
3513                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3514                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3515                 write_sequnlock(&state->seqlock);
3516                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3517
3518                 if (fatal_signal_pending(current))
3519                         status = -EINTR;
3520                 else
3521                         if (schedule_timeout(5*HZ) != 0)
3522                                 status = 0;
3523
3524                 finish_wait(&state->waitq, &wait);
3525
3526                 if (!status)
3527                         continue;
3528                 if (status == -EINTR)
3529                         break;
3530
3531                 /* we slept the whole 5 seconds, we must have lost a seqid */
3532                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3533                 ret = true;
3534                 break;
3535         }
3536
3537         return ret;
3538 }
3539
3540 struct nfs4_closedata {
3541         struct inode *inode;
3542         struct nfs4_state *state;
3543         struct nfs_closeargs arg;
3544         struct nfs_closeres res;
3545         struct {
3546                 struct nfs4_layoutreturn_args arg;
3547                 struct nfs4_layoutreturn_res res;
3548                 struct nfs4_xdr_opaque_data ld_private;
3549                 u32 roc_barrier;
3550                 bool roc;
3551         } lr;
3552         struct nfs_fattr fattr;
3553         unsigned long timestamp;
3554 };
3555
3556 static void nfs4_free_closedata(void *data)
3557 {
3558         struct nfs4_closedata *calldata = data;
3559         struct nfs4_state_owner *sp = calldata->state->owner;
3560         struct super_block *sb = calldata->state->inode->i_sb;
3561
3562         if (calldata->lr.roc)
3563                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3564                                 calldata->res.lr_ret);
3565         nfs4_put_open_state(calldata->state);
3566         nfs_free_seqid(calldata->arg.seqid);
3567         nfs4_put_state_owner(sp);
3568         nfs_sb_deactive(sb);
3569         kfree(calldata);
3570 }
3571
3572 static void nfs4_close_done(struct rpc_task *task, void *data)
3573 {
3574         struct nfs4_closedata *calldata = data;
3575         struct nfs4_state *state = calldata->state;
3576         struct nfs_server *server = NFS_SERVER(calldata->inode);
3577         nfs4_stateid *res_stateid = NULL;
3578         struct nfs4_exception exception = {
3579                 .state = state,
3580                 .inode = calldata->inode,
3581                 .stateid = &calldata->arg.stateid,
3582         };
3583
3584         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3585                 return;
3586         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3587
3588         /* Handle Layoutreturn errors */
3589         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3590                           &calldata->res.lr_ret) == -EAGAIN)
3591                 goto out_restart;
3592
3593         /* hmm. we are done with the inode, and in the process of freeing
3594          * the state_owner. we keep this around to process errors
3595          */
3596         switch (task->tk_status) {
3597                 case 0:
3598                         res_stateid = &calldata->res.stateid;
3599                         renew_lease(server, calldata->timestamp);
3600                         break;
3601                 case -NFS4ERR_ACCESS:
3602                         if (calldata->arg.bitmask != NULL) {
3603                                 calldata->arg.bitmask = NULL;
3604                                 calldata->res.fattr = NULL;
3605                                 goto out_restart;
3606
3607                         }
3608                         break;
3609                 case -NFS4ERR_OLD_STATEID:
3610                         /* Did we race with OPEN? */
3611                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3612                                                 state))
3613                                 goto out_restart;
3614                         goto out_release;
3615                 case -NFS4ERR_ADMIN_REVOKED:
3616                 case -NFS4ERR_STALE_STATEID:
3617                 case -NFS4ERR_EXPIRED:
3618                         nfs4_free_revoked_stateid(server,
3619                                         &calldata->arg.stateid,
3620                                         task->tk_msg.rpc_cred);
3621                         fallthrough;
3622                 case -NFS4ERR_BAD_STATEID:
3623                         if (calldata->arg.fmode == 0)
3624                                 break;
3625                         fallthrough;
3626                 default:
3627                         task->tk_status = nfs4_async_handle_exception(task,
3628                                         server, task->tk_status, &exception);
3629                         if (exception.retry)
3630                                 goto out_restart;
3631         }
3632         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3633                         res_stateid, calldata->arg.fmode);
3634 out_release:
3635         task->tk_status = 0;
3636         nfs_release_seqid(calldata->arg.seqid);
3637         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3638         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3639         return;
3640 out_restart:
3641         task->tk_status = 0;
3642         rpc_restart_call_prepare(task);
3643         goto out_release;
3644 }
3645
3646 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3647 {
3648         struct nfs4_closedata *calldata = data;
3649         struct nfs4_state *state = calldata->state;
3650         struct inode *inode = calldata->inode;
3651         struct nfs_server *server = NFS_SERVER(inode);
3652         struct pnfs_layout_hdr *lo;
3653         bool is_rdonly, is_wronly, is_rdwr;
3654         int call_close = 0;
3655
3656         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3657                 goto out_wait;
3658
3659         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3660         spin_lock(&state->owner->so_lock);
3661         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3662         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3663         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3664         /* Calculate the change in open mode */
3665         calldata->arg.fmode = 0;
3666         if (state->n_rdwr == 0) {
3667                 if (state->n_rdonly == 0)
3668                         call_close |= is_rdonly;
3669                 else if (is_rdonly)
3670                         calldata->arg.fmode |= FMODE_READ;
3671                 if (state->n_wronly == 0)
3672                         call_close |= is_wronly;
3673                 else if (is_wronly)
3674                         calldata->arg.fmode |= FMODE_WRITE;
3675                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3676                         call_close |= is_rdwr;
3677         } else if (is_rdwr)
3678                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3679
3680         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3681         if (!nfs4_valid_open_stateid(state))
3682                 call_close = 0;
3683         spin_unlock(&state->owner->so_lock);
3684
3685         if (!call_close) {
3686                 /* Note: exit _without_ calling nfs4_close_done */
3687                 goto out_no_action;
3688         }
3689
3690         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3691                 nfs_release_seqid(calldata->arg.seqid);
3692                 goto out_wait;
3693         }
3694
3695         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3696         if (lo && !pnfs_layout_is_valid(lo)) {
3697                 calldata->arg.lr_args = NULL;
3698                 calldata->res.lr_res = NULL;
3699         }
3700
3701         if (calldata->arg.fmode == 0)
3702                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3703
3704         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3705                 /* Close-to-open cache consistency revalidation */
3706                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3707                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3708                                          server->cache_consistency_bitmask,
3709                                          inode, 0);
3710                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3711                 } else
3712                         calldata->arg.bitmask = NULL;
3713         }
3714
3715         calldata->arg.share_access =
3716                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3717                                 calldata->arg.fmode, 0);
3718
3719         if (calldata->res.fattr == NULL)
3720                 calldata->arg.bitmask = NULL;
3721         else if (calldata->arg.bitmask == NULL)
3722                 calldata->res.fattr = NULL;
3723         calldata->timestamp = jiffies;
3724         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3725                                 &calldata->arg.seq_args,
3726                                 &calldata->res.seq_res,
3727                                 task) != 0)
3728                 nfs_release_seqid(calldata->arg.seqid);
3729         return;
3730 out_no_action:
3731         task->tk_action = NULL;
3732 out_wait:
3733         nfs4_sequence_done(task, &calldata->res.seq_res);
3734 }
3735
3736 static const struct rpc_call_ops nfs4_close_ops = {
3737         .rpc_call_prepare = nfs4_close_prepare,
3738         .rpc_call_done = nfs4_close_done,
3739         .rpc_release = nfs4_free_closedata,
3740 };
3741
3742 /*
3743  * It is possible for data to be read/written from a mem-mapped file
3744  * after the sys_close call (which hits the vfs layer as a flush).
3745  * This means that we can't safely call nfsv4 close on a file until
3746  * the inode is cleared. This in turn means that we are not good
3747  * NFSv4 citizens - we do not indicate to the server to update the file's
3748  * share state even when we are done with one of the three share
3749  * stateid's in the inode.
3750  *
3751  * NOTE: Caller must be holding the sp->so_owner semaphore!
3752  */
3753 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3754 {
3755         struct nfs_server *server = NFS_SERVER(state->inode);
3756         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3757         struct nfs4_closedata *calldata;
3758         struct nfs4_state_owner *sp = state->owner;
3759         struct rpc_task *task;
3760         struct rpc_message msg = {
3761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3762                 .rpc_cred = state->owner->so_cred,
3763         };
3764         struct rpc_task_setup task_setup_data = {
3765                 .rpc_client = server->client,
3766                 .rpc_message = &msg,
3767                 .callback_ops = &nfs4_close_ops,
3768                 .workqueue = nfsiod_workqueue,
3769                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3770         };
3771         int status = -ENOMEM;
3772
3773         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3774                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3775
3776         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3777                 &task_setup_data.rpc_client, &msg);
3778
3779         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3780         if (calldata == NULL)
3781                 goto out;
3782         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3783         calldata->inode = state->inode;
3784         calldata->state = state;
3785         calldata->arg.fh = NFS_FH(state->inode);
3786         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3787                 goto out_free_calldata;
3788         /* Serialization for the sequence id */
3789         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3790         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3791         if (IS_ERR(calldata->arg.seqid))
3792                 goto out_free_calldata;
3793         nfs_fattr_init(&calldata->fattr);
3794         calldata->arg.fmode = 0;
3795         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3796         calldata->res.fattr = &calldata->fattr;
3797         calldata->res.seqid = calldata->arg.seqid;
3798         calldata->res.server = server;
3799         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3800         calldata->lr.roc = pnfs_roc(state->inode,
3801                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3802         if (calldata->lr.roc) {
3803                 calldata->arg.lr_args = &calldata->lr.arg;
3804                 calldata->res.lr_res = &calldata->lr.res;
3805         }
3806         nfs_sb_active(calldata->inode->i_sb);
3807
3808         msg.rpc_argp = &calldata->arg;
3809         msg.rpc_resp = &calldata->res;
3810         task_setup_data.callback_data = calldata;
3811         task = rpc_run_task(&task_setup_data);
3812         if (IS_ERR(task))
3813                 return PTR_ERR(task);
3814         status = 0;
3815         if (wait)
3816                 status = rpc_wait_for_completion_task(task);
3817         rpc_put_task(task);
3818         return status;
3819 out_free_calldata:
3820         kfree(calldata);
3821 out:
3822         nfs4_put_open_state(state);
3823         nfs4_put_state_owner(sp);
3824         return status;
3825 }
3826
3827 static struct inode *
3828 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3829                 int open_flags, struct iattr *attr, int *opened)
3830 {
3831         struct nfs4_state *state;
3832         struct nfs4_label l, *label;
3833
3834         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3835
3836         /* Protect against concurrent sillydeletes */
3837         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3838
3839         nfs4_label_release_security(label);
3840
3841         if (IS_ERR(state))
3842                 return ERR_CAST(state);
3843         return state->inode;
3844 }
3845
3846 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3847 {
3848         if (ctx->state == NULL)
3849                 return;
3850         if (is_sync)
3851                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3852         else
3853                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3854 }
3855
3856 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3857 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3858 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3859
3860 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3861 {
3862         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3863         struct nfs4_server_caps_arg args = {
3864                 .fhandle = fhandle,
3865                 .bitmask = bitmask,
3866         };
3867         struct nfs4_server_caps_res res = {};
3868         struct rpc_message msg = {
3869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3870                 .rpc_argp = &args,
3871                 .rpc_resp = &res,
3872         };
3873         int status;
3874         int i;
3875
3876         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3877                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3878                      FATTR4_WORD0_LINK_SUPPORT |
3879                      FATTR4_WORD0_SYMLINK_SUPPORT |
3880                      FATTR4_WORD0_ACLSUPPORT |
3881                      FATTR4_WORD0_CASE_INSENSITIVE |
3882                      FATTR4_WORD0_CASE_PRESERVING;
3883         if (minorversion)
3884                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3885
3886         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3887         if (status == 0) {
3888                 /* Sanity check the server answers */
3889                 switch (minorversion) {
3890                 case 0:
3891                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3892                         res.attr_bitmask[2] = 0;
3893                         break;
3894                 case 1:
3895                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3896                         break;
3897                 case 2:
3898                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3899                 }
3900                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3901                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3902                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3903                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3904                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3905                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3906                         server->caps |= NFS_CAP_ACLS;
3907                 if (res.has_links != 0)
3908                         server->caps |= NFS_CAP_HARDLINKS;
3909                 if (res.has_symlinks != 0)
3910                         server->caps |= NFS_CAP_SYMLINKS;
3911                 if (res.case_insensitive)
3912                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3913                 if (res.case_preserving)
3914                         server->caps |= NFS_CAP_CASE_PRESERVING;
3915 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3916                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3917                         server->caps |= NFS_CAP_SECURITY_LABEL;
3918 #endif
3919                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3920                         server->caps |= NFS_CAP_FS_LOCATIONS;
3921                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3922                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3923                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3924                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3925                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3926                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3927                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3928                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3929                                 NFS_ATTR_FATTR_OWNER_NAME);
3930                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3931                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3932                                 NFS_ATTR_FATTR_GROUP_NAME);
3933                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3934                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3935                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3936                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3937                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3938                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3939                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3940                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3941                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3942                                 sizeof(server->attr_bitmask));
3943                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3944
3945                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3946                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3947                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3948                 server->cache_consistency_bitmask[2] = 0;
3949
3950                 /* Avoid a regression due to buggy server */
3951                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3952                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3953                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3954                         sizeof(server->exclcreat_bitmask));
3955
3956                 server->acl_bitmask = res.acl_bitmask;
3957                 server->fh_expire_type = res.fh_expire_type;
3958         }
3959
3960         return status;
3961 }
3962
3963 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3964 {
3965         struct nfs4_exception exception = {
3966                 .interruptible = true,
3967         };
3968         int err;
3969
3970         nfs4_server_set_init_caps(server);
3971         do {
3972                 err = nfs4_handle_exception(server,
3973                                 _nfs4_server_capabilities(server, fhandle),
3974                                 &exception);
3975         } while (exception.retry);
3976         return err;
3977 }
3978
3979 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3980                                           struct nfs_client *clp,
3981                                           struct nfs_server *server)
3982 {
3983         int i;
3984
3985         for (i = 0; i < location->nservers; i++) {
3986                 struct nfs4_string *srv_loc = &location->servers[i];
3987                 struct sockaddr_storage addr;
3988                 size_t addrlen;
3989                 struct xprt_create xprt_args = {
3990                         .ident = 0,
3991                         .net = clp->cl_net,
3992                 };
3993                 struct nfs4_add_xprt_data xprtdata = {
3994                         .clp = clp,
3995                 };
3996                 struct rpc_add_xprt_test rpcdata = {
3997                         .add_xprt_test = clp->cl_mvops->session_trunk,
3998                         .data = &xprtdata,
3999                 };
4000                 char *servername = NULL;
4001
4002                 if (!srv_loc->len)
4003                         continue;
4004
4005                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4006                                                 &addr, sizeof(addr),
4007                                                 clp->cl_net, server->port);
4008                 if (!addrlen)
4009                         return;
4010                 xprt_args.dstaddr = (struct sockaddr *)&addr;
4011                 xprt_args.addrlen = addrlen;
4012                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4013                 if (!servername)
4014                         return;
4015                 memcpy(servername, srv_loc->data, srv_loc->len);
4016                 servername[srv_loc->len] = '\0';
4017                 xprt_args.servername = servername;
4018
4019                 xprtdata.cred = nfs4_get_clid_cred(clp);
4020                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4021                                   rpc_clnt_setup_test_and_add_xprt,
4022                                   &rpcdata);
4023                 if (xprtdata.cred)
4024                         put_cred(xprtdata.cred);
4025                 kfree(servername);
4026         }
4027 }
4028
4029 static int _nfs4_discover_trunking(struct nfs_server *server,
4030                                    struct nfs_fh *fhandle)
4031 {
4032         struct nfs4_fs_locations *locations = NULL;
4033         struct page *page;
4034         const struct cred *cred;
4035         struct nfs_client *clp = server->nfs_client;
4036         const struct nfs4_state_maintenance_ops *ops =
4037                 clp->cl_mvops->state_renewal_ops;
4038         int status = -ENOMEM, i;
4039
4040         cred = ops->get_state_renewal_cred(clp);
4041         if (cred == NULL) {
4042                 cred = nfs4_get_clid_cred(clp);
4043                 if (cred == NULL)
4044                         return -ENOKEY;
4045         }
4046
4047         page = alloc_page(GFP_KERNEL);
4048         if (!page)
4049                 goto out_put_cred;
4050         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4051         if (!locations)
4052                 goto out_free;
4053         locations->fattr = nfs_alloc_fattr();
4054         if (!locations->fattr)
4055                 goto out_free_2;
4056
4057         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4058                                          cred);
4059         if (status)
4060                 goto out_free_3;
4061
4062         for (i = 0; i < locations->nlocations; i++)
4063                 test_fs_location_for_trunking(&locations->locations[i], clp,
4064                                               server);
4065 out_free_3:
4066         kfree(locations->fattr);
4067 out_free_2:
4068         kfree(locations);
4069 out_free:
4070         __free_page(page);
4071 out_put_cred:
4072         put_cred(cred);
4073         return status;
4074 }
4075
4076 static int nfs4_discover_trunking(struct nfs_server *server,
4077                                   struct nfs_fh *fhandle)
4078 {
4079         struct nfs4_exception exception = {
4080                 .interruptible = true,
4081         };
4082         struct nfs_client *clp = server->nfs_client;
4083         int err = 0;
4084
4085         if (!nfs4_has_session(clp))
4086                 goto out;
4087         do {
4088                 err = nfs4_handle_exception(server,
4089                                 _nfs4_discover_trunking(server, fhandle),
4090                                 &exception);
4091         } while (exception.retry);
4092 out:
4093         return err;
4094 }
4095
4096 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4097                 struct nfs_fsinfo *info)
4098 {
4099         u32 bitmask[3];
4100         struct nfs4_lookup_root_arg args = {
4101                 .bitmask = bitmask,
4102         };
4103         struct nfs4_lookup_res res = {
4104                 .server = server,
4105                 .fattr = info->fattr,
4106                 .fh = fhandle,
4107         };
4108         struct rpc_message msg = {
4109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4110                 .rpc_argp = &args,
4111                 .rpc_resp = &res,
4112         };
4113
4114         bitmask[0] = nfs4_fattr_bitmap[0];
4115         bitmask[1] = nfs4_fattr_bitmap[1];
4116         /*
4117          * Process the label in the upcoming getfattr
4118          */
4119         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4120
4121         nfs_fattr_init(info->fattr);
4122         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4123 }
4124
4125 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4126                 struct nfs_fsinfo *info)
4127 {
4128         struct nfs4_exception exception = {
4129                 .interruptible = true,
4130         };
4131         int err;
4132         do {
4133                 err = _nfs4_lookup_root(server, fhandle, info);
4134                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4135                 switch (err) {
4136                 case 0:
4137                 case -NFS4ERR_WRONGSEC:
4138                         goto out;
4139                 default:
4140                         err = nfs4_handle_exception(server, err, &exception);
4141                 }
4142         } while (exception.retry);
4143 out:
4144         return err;
4145 }
4146
4147 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4148                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4149 {
4150         struct rpc_auth_create_args auth_args = {
4151                 .pseudoflavor = flavor,
4152         };
4153         struct rpc_auth *auth;
4154
4155         auth = rpcauth_create(&auth_args, server->client);
4156         if (IS_ERR(auth))
4157                 return -EACCES;
4158         return nfs4_lookup_root(server, fhandle, info);
4159 }
4160
4161 /*
4162  * Retry pseudoroot lookup with various security flavors.  We do this when:
4163  *
4164  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4165  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4166  *
4167  * Returns zero on success, or a negative NFS4ERR value, or a
4168  * negative errno value.
4169  */
4170 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4171                               struct nfs_fsinfo *info)
4172 {
4173         /* Per 3530bis 15.33.5 */
4174         static const rpc_authflavor_t flav_array[] = {
4175                 RPC_AUTH_GSS_KRB5P,
4176                 RPC_AUTH_GSS_KRB5I,
4177                 RPC_AUTH_GSS_KRB5,
4178                 RPC_AUTH_UNIX,                  /* courtesy */
4179                 RPC_AUTH_NULL,
4180         };
4181         int status = -EPERM;
4182         size_t i;
4183
4184         if (server->auth_info.flavor_len > 0) {
4185                 /* try each flavor specified by user */
4186                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4187                         status = nfs4_lookup_root_sec(server, fhandle, info,
4188                                                 server->auth_info.flavors[i]);
4189                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4190                                 continue;
4191                         break;
4192                 }
4193         } else {
4194                 /* no flavors specified by user, try default list */
4195                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4196                         status = nfs4_lookup_root_sec(server, fhandle, info,
4197                                                       flav_array[i]);
4198                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4199                                 continue;
4200                         break;
4201                 }
4202         }
4203
4204         /*
4205          * -EACCES could mean that the user doesn't have correct permissions
4206          * to access the mount.  It could also mean that we tried to mount
4207          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4208          * existing mount programs don't handle -EACCES very well so it should
4209          * be mapped to -EPERM instead.
4210          */
4211         if (status == -EACCES)
4212                 status = -EPERM;
4213         return status;
4214 }
4215
4216 /**
4217  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4218  * @server: initialized nfs_server handle
4219  * @fhandle: we fill in the pseudo-fs root file handle
4220  * @info: we fill in an FSINFO struct
4221  * @auth_probe: probe the auth flavours
4222  *
4223  * Returns zero on success, or a negative errno.
4224  */
4225 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4226                          struct nfs_fsinfo *info,
4227                          bool auth_probe)
4228 {
4229         int status = 0;
4230
4231         if (!auth_probe)
4232                 status = nfs4_lookup_root(server, fhandle, info);
4233
4234         if (auth_probe || status == NFS4ERR_WRONGSEC)
4235                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4236                                 fhandle, info);
4237
4238         if (status == 0)
4239                 status = nfs4_server_capabilities(server, fhandle);
4240         if (status == 0)
4241                 status = nfs4_do_fsinfo(server, fhandle, info);
4242
4243         return nfs4_map_errors(status);
4244 }
4245
4246 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4247                               struct nfs_fsinfo *info)
4248 {
4249         int error;
4250         struct nfs_fattr *fattr = info->fattr;
4251
4252         error = nfs4_server_capabilities(server, mntfh);
4253         if (error < 0) {
4254                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4255                 return error;
4256         }
4257
4258         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4259         if (error < 0) {
4260                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4261                 goto out;
4262         }
4263
4264         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4265             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4266                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4267
4268 out:
4269         return error;
4270 }
4271
4272 /*
4273  * Get locations and (maybe) other attributes of a referral.
4274  * Note that we'll actually follow the referral later when
4275  * we detect fsid mismatch in inode revalidation
4276  */
4277 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4278                              const struct qstr *name, struct nfs_fattr *fattr,
4279                              struct nfs_fh *fhandle)
4280 {
4281         int status = -ENOMEM;
4282         struct page *page = NULL;
4283         struct nfs4_fs_locations *locations = NULL;
4284
4285         page = alloc_page(GFP_KERNEL);
4286         if (page == NULL)
4287                 goto out;
4288         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4289         if (locations == NULL)
4290                 goto out;
4291
4292         locations->fattr = fattr;
4293
4294         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4295         if (status != 0)
4296                 goto out;
4297
4298         /*
4299          * If the fsid didn't change, this is a migration event, not a
4300          * referral.  Cause us to drop into the exception handler, which
4301          * will kick off migration recovery.
4302          */
4303         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4304                 dprintk("%s: server did not return a different fsid for"
4305                         " a referral at %s\n", __func__, name->name);
4306                 status = -NFS4ERR_MOVED;
4307                 goto out;
4308         }
4309         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4310         nfs_fixup_referral_attributes(fattr);
4311         memset(fhandle, 0, sizeof(struct nfs_fh));
4312 out:
4313         if (page)
4314                 __free_page(page);
4315         kfree(locations);
4316         return status;
4317 }
4318
4319 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4320                                 struct nfs_fattr *fattr, struct inode *inode)
4321 {
4322         __u32 bitmask[NFS4_BITMASK_SZ];
4323         struct nfs4_getattr_arg args = {
4324                 .fh = fhandle,
4325                 .bitmask = bitmask,
4326         };
4327         struct nfs4_getattr_res res = {
4328                 .fattr = fattr,
4329                 .server = server,
4330         };
4331         struct rpc_message msg = {
4332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4333                 .rpc_argp = &args,
4334                 .rpc_resp = &res,
4335         };
4336         unsigned short task_flags = 0;
4337
4338         if (nfs4_has_session(server->nfs_client))
4339                 task_flags = RPC_TASK_MOVEABLE;
4340
4341         /* Is this is an attribute revalidation, subject to softreval? */
4342         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4343                 task_flags |= RPC_TASK_TIMEOUT;
4344
4345         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4346         nfs_fattr_init(fattr);
4347         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4348         return nfs4_do_call_sync(server->client, server, &msg,
4349                         &args.seq_args, &res.seq_res, task_flags);
4350 }
4351
4352 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4353                                 struct nfs_fattr *fattr, struct inode *inode)
4354 {
4355         struct nfs4_exception exception = {
4356                 .interruptible = true,
4357         };
4358         int err;
4359         do {
4360                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4361                 trace_nfs4_getattr(server, fhandle, fattr, err);
4362                 err = nfs4_handle_exception(server, err,
4363                                 &exception);
4364         } while (exception.retry);
4365         return err;
4366 }
4367
4368 /*
4369  * The file is not closed if it is opened due to the a request to change
4370  * the size of the file. The open call will not be needed once the
4371  * VFS layer lookup-intents are implemented.
4372  *
4373  * Close is called when the inode is destroyed.
4374  * If we haven't opened the file for O_WRONLY, we
4375  * need to in the size_change case to obtain a stateid.
4376  *
4377  * Got race?
4378  * Because OPEN is always done by name in nfsv4, it is
4379  * possible that we opened a different file by the same
4380  * name.  We can recognize this race condition, but we
4381  * can't do anything about it besides returning an error.
4382  *
4383  * This will be fixed with VFS changes (lookup-intent).
4384  */
4385 static int
4386 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4387                   struct iattr *sattr)
4388 {
4389         struct inode *inode = d_inode(dentry);
4390         const struct cred *cred = NULL;
4391         struct nfs_open_context *ctx = NULL;
4392         int status;
4393
4394         if (pnfs_ld_layoutret_on_setattr(inode) &&
4395             sattr->ia_valid & ATTR_SIZE &&
4396             sattr->ia_size < i_size_read(inode))
4397                 pnfs_commit_and_return_layout(inode);
4398
4399         nfs_fattr_init(fattr);
4400
4401         /* Deal with open(O_TRUNC) */
4402         if (sattr->ia_valid & ATTR_OPEN)
4403                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4404
4405         /* Optimization: if the end result is no change, don't RPC */
4406         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4407                 return 0;
4408
4409         /* Search for an existing open(O_WRITE) file */
4410         if (sattr->ia_valid & ATTR_FILE) {
4411
4412                 ctx = nfs_file_open_context(sattr->ia_file);
4413                 if (ctx)
4414                         cred = ctx->cred;
4415         }
4416
4417         /* Return any delegations if we're going to change ACLs */
4418         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4419                 nfs4_inode_make_writeable(inode);
4420
4421         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4422         if (status == 0) {
4423                 nfs_setattr_update_inode(inode, sattr, fattr);
4424                 nfs_setsecurity(inode, fattr);
4425         }
4426         return status;
4427 }
4428
4429 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4430                 struct dentry *dentry, struct nfs_fh *fhandle,
4431                 struct nfs_fattr *fattr)
4432 {
4433         struct nfs_server *server = NFS_SERVER(dir);
4434         int                    status;
4435         struct nfs4_lookup_arg args = {
4436                 .bitmask = server->attr_bitmask,
4437                 .dir_fh = NFS_FH(dir),
4438                 .name = &dentry->d_name,
4439         };
4440         struct nfs4_lookup_res res = {
4441                 .server = server,
4442                 .fattr = fattr,
4443                 .fh = fhandle,
4444         };
4445         struct rpc_message msg = {
4446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4447                 .rpc_argp = &args,
4448                 .rpc_resp = &res,
4449         };
4450         unsigned short task_flags = 0;
4451
4452         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4453                 task_flags = RPC_TASK_MOVEABLE;
4454
4455         /* Is this is an attribute revalidation, subject to softreval? */
4456         if (nfs_lookup_is_soft_revalidate(dentry))
4457                 task_flags |= RPC_TASK_TIMEOUT;
4458
4459         args.bitmask = nfs4_bitmask(server, fattr->label);
4460
4461         nfs_fattr_init(fattr);
4462
4463         dprintk("NFS call  lookup %pd2\n", dentry);
4464         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4465         status = nfs4_do_call_sync(clnt, server, &msg,
4466                         &args.seq_args, &res.seq_res, task_flags);
4467         dprintk("NFS reply lookup: %d\n", status);
4468         return status;
4469 }
4470
4471 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4472 {
4473         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4474                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4475         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4476         fattr->nlink = 2;
4477 }
4478
4479 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4480                                    struct dentry *dentry, struct nfs_fh *fhandle,
4481                                    struct nfs_fattr *fattr)
4482 {
4483         struct nfs4_exception exception = {
4484                 .interruptible = true,
4485         };
4486         struct rpc_clnt *client = *clnt;
4487         const struct qstr *name = &dentry->d_name;
4488         int err;
4489         do {
4490                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4491                 trace_nfs4_lookup(dir, name, err);
4492                 switch (err) {
4493                 case -NFS4ERR_BADNAME:
4494                         err = -ENOENT;
4495                         goto out;
4496                 case -NFS4ERR_MOVED:
4497                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4498                         if (err == -NFS4ERR_MOVED)
4499                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4500                         goto out;
4501                 case -NFS4ERR_WRONGSEC:
4502                         err = -EPERM;
4503                         if (client != *clnt)
4504                                 goto out;
4505                         client = nfs4_negotiate_security(client, dir, name);
4506                         if (IS_ERR(client))
4507                                 return PTR_ERR(client);
4508
4509                         exception.retry = 1;
4510                         break;
4511                 default:
4512                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4513                 }
4514         } while (exception.retry);
4515
4516 out:
4517         if (err == 0)
4518                 *clnt = client;
4519         else if (client != *clnt)
4520                 rpc_shutdown_client(client);
4521
4522         return err;
4523 }
4524
4525 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4526                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4527 {
4528         int status;
4529         struct rpc_clnt *client = NFS_CLIENT(dir);
4530
4531         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4532         if (client != NFS_CLIENT(dir)) {
4533                 rpc_shutdown_client(client);
4534                 nfs_fixup_secinfo_attributes(fattr);
4535         }
4536         return status;
4537 }
4538
4539 struct rpc_clnt *
4540 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4541                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4542 {
4543         struct rpc_clnt *client = NFS_CLIENT(dir);
4544         int status;
4545
4546         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4547         if (status < 0)
4548                 return ERR_PTR(status);
4549         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4550 }
4551
4552 static int _nfs4_proc_lookupp(struct inode *inode,
4553                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4554 {
4555         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4556         struct nfs_server *server = NFS_SERVER(inode);
4557         int                    status;
4558         struct nfs4_lookupp_arg args = {
4559                 .bitmask = server->attr_bitmask,
4560                 .fh = NFS_FH(inode),
4561         };
4562         struct nfs4_lookupp_res res = {
4563                 .server = server,
4564                 .fattr = fattr,
4565                 .fh = fhandle,
4566         };
4567         struct rpc_message msg = {
4568                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4569                 .rpc_argp = &args,
4570                 .rpc_resp = &res,
4571         };
4572         unsigned short task_flags = 0;
4573
4574         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4575                 task_flags |= RPC_TASK_TIMEOUT;
4576
4577         args.bitmask = nfs4_bitmask(server, fattr->label);
4578
4579         nfs_fattr_init(fattr);
4580
4581         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4582         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4583                                 &res.seq_res, task_flags);
4584         dprintk("NFS reply lookupp: %d\n", status);
4585         return status;
4586 }
4587
4588 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4589                              struct nfs_fattr *fattr)
4590 {
4591         struct nfs4_exception exception = {
4592                 .interruptible = true,
4593         };
4594         int err;
4595         do {
4596                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4597                 trace_nfs4_lookupp(inode, err);
4598                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4599                                 &exception);
4600         } while (exception.retry);
4601         return err;
4602 }
4603
4604 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4605                              const struct cred *cred)
4606 {
4607         struct nfs_server *server = NFS_SERVER(inode);
4608         struct nfs4_accessargs args = {
4609                 .fh = NFS_FH(inode),
4610                 .access = entry->mask,
4611         };
4612         struct nfs4_accessres res = {
4613                 .server = server,
4614         };
4615         struct rpc_message msg = {
4616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4617                 .rpc_argp = &args,
4618                 .rpc_resp = &res,
4619                 .rpc_cred = cred,
4620         };
4621         int status = 0;
4622
4623         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4624                 res.fattr = nfs_alloc_fattr();
4625                 if (res.fattr == NULL)
4626                         return -ENOMEM;
4627                 args.bitmask = server->cache_consistency_bitmask;
4628         }
4629         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4630         if (!status) {
4631                 nfs_access_set_mask(entry, res.access);
4632                 if (res.fattr)
4633                         nfs_refresh_inode(inode, res.fattr);
4634         }
4635         nfs_free_fattr(res.fattr);
4636         return status;
4637 }
4638
4639 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4640                             const struct cred *cred)
4641 {
4642         struct nfs4_exception exception = {
4643                 .interruptible = true,
4644         };
4645         int err;
4646         do {
4647                 err = _nfs4_proc_access(inode, entry, cred);
4648                 trace_nfs4_access(inode, err);
4649                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4650                                 &exception);
4651         } while (exception.retry);
4652         return err;
4653 }
4654
4655 /*
4656  * TODO: For the time being, we don't try to get any attributes
4657  * along with any of the zero-copy operations READ, READDIR,
4658  * READLINK, WRITE.
4659  *
4660  * In the case of the first three, we want to put the GETATTR
4661  * after the read-type operation -- this is because it is hard
4662  * to predict the length of a GETATTR response in v4, and thus
4663  * align the READ data correctly.  This means that the GETATTR
4664  * may end up partially falling into the page cache, and we should
4665  * shift it into the 'tail' of the xdr_buf before processing.
4666  * To do this efficiently, we need to know the total length
4667  * of data received, which doesn't seem to be available outside
4668  * of the RPC layer.
4669  *
4670  * In the case of WRITE, we also want to put the GETATTR after
4671  * the operation -- in this case because we want to make sure
4672  * we get the post-operation mtime and size.
4673  *
4674  * Both of these changes to the XDR layer would in fact be quite
4675  * minor, but I decided to leave them for a subsequent patch.
4676  */
4677 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4678                 unsigned int pgbase, unsigned int pglen)
4679 {
4680         struct nfs4_readlink args = {
4681                 .fh       = NFS_FH(inode),
4682                 .pgbase   = pgbase,
4683                 .pglen    = pglen,
4684                 .pages    = &page,
4685         };
4686         struct nfs4_readlink_res res;
4687         struct rpc_message msg = {
4688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4689                 .rpc_argp = &args,
4690                 .rpc_resp = &res,
4691         };
4692
4693         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4694 }
4695
4696 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4697                 unsigned int pgbase, unsigned int pglen)
4698 {
4699         struct nfs4_exception exception = {
4700                 .interruptible = true,
4701         };
4702         int err;
4703         do {
4704                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4705                 trace_nfs4_readlink(inode, err);
4706                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4707                                 &exception);
4708         } while (exception.retry);
4709         return err;
4710 }
4711
4712 /*
4713  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4714  */
4715 static int
4716 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4717                  int flags)
4718 {
4719         struct nfs_server *server = NFS_SERVER(dir);
4720         struct nfs4_label l, *ilabel;
4721         struct nfs_open_context *ctx;
4722         struct nfs4_state *state;
4723         int status = 0;
4724
4725         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4726         if (IS_ERR(ctx))
4727                 return PTR_ERR(ctx);
4728
4729         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4730
4731         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4732                 sattr->ia_mode &= ~current_umask();
4733         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4734         if (IS_ERR(state)) {
4735                 status = PTR_ERR(state);
4736                 goto out;
4737         }
4738 out:
4739         nfs4_label_release_security(ilabel);
4740         put_nfs_open_context(ctx);
4741         return status;
4742 }
4743
4744 static int
4745 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4746 {
4747         struct nfs_server *server = NFS_SERVER(dir);
4748         struct nfs_removeargs args = {
4749                 .fh = NFS_FH(dir),
4750                 .name = *name,
4751         };
4752         struct nfs_removeres res = {
4753                 .server = server,
4754         };
4755         struct rpc_message msg = {
4756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4757                 .rpc_argp = &args,
4758                 .rpc_resp = &res,
4759         };
4760         unsigned long timestamp = jiffies;
4761         int status;
4762
4763         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4764         if (status == 0) {
4765                 spin_lock(&dir->i_lock);
4766                 /* Removing a directory decrements nlink in the parent */
4767                 if (ftype == NF4DIR && dir->i_nlink > 2)
4768                         nfs4_dec_nlink_locked(dir);
4769                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4770                                               NFS_INO_INVALID_DATA);
4771                 spin_unlock(&dir->i_lock);
4772         }
4773         return status;
4774 }
4775
4776 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4777 {
4778         struct nfs4_exception exception = {
4779                 .interruptible = true,
4780         };
4781         struct inode *inode = d_inode(dentry);
4782         int err;
4783
4784         if (inode) {
4785                 if (inode->i_nlink == 1)
4786                         nfs4_inode_return_delegation(inode);
4787                 else
4788                         nfs4_inode_make_writeable(inode);
4789         }
4790         do {
4791                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4792                 trace_nfs4_remove(dir, &dentry->d_name, err);
4793                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4794                                 &exception);
4795         } while (exception.retry);
4796         return err;
4797 }
4798
4799 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4800 {
4801         struct nfs4_exception exception = {
4802                 .interruptible = true,
4803         };
4804         int err;
4805
4806         do {
4807                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4808                 trace_nfs4_remove(dir, name, err);
4809                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4810                                 &exception);
4811         } while (exception.retry);
4812         return err;
4813 }
4814
4815 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4816                 struct dentry *dentry,
4817                 struct inode *inode)
4818 {
4819         struct nfs_removeargs *args = msg->rpc_argp;
4820         struct nfs_removeres *res = msg->rpc_resp;
4821
4822         res->server = NFS_SB(dentry->d_sb);
4823         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4824         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4825
4826         nfs_fattr_init(res->dir_attr);
4827
4828         if (inode) {
4829                 nfs4_inode_return_delegation(inode);
4830                 nfs_d_prune_case_insensitive_aliases(inode);
4831         }
4832 }
4833
4834 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4835 {
4836         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4837                         &data->args.seq_args,
4838                         &data->res.seq_res,
4839                         task);
4840 }
4841
4842 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4843 {
4844         struct nfs_unlinkdata *data = task->tk_calldata;
4845         struct nfs_removeres *res = &data->res;
4846
4847         if (!nfs4_sequence_done(task, &res->seq_res))
4848                 return 0;
4849         if (nfs4_async_handle_error(task, res->server, NULL,
4850                                     &data->timeout) == -EAGAIN)
4851                 return 0;
4852         if (task->tk_status == 0)
4853                 nfs4_update_changeattr(dir, &res->cinfo,
4854                                 res->dir_attr->time_start,
4855                                 NFS_INO_INVALID_DATA);
4856         return 1;
4857 }
4858
4859 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4860                 struct dentry *old_dentry,
4861                 struct dentry *new_dentry)
4862 {
4863         struct nfs_renameargs *arg = msg->rpc_argp;
4864         struct nfs_renameres *res = msg->rpc_resp;
4865         struct inode *old_inode = d_inode(old_dentry);
4866         struct inode *new_inode = d_inode(new_dentry);
4867
4868         if (old_inode)
4869                 nfs4_inode_make_writeable(old_inode);
4870         if (new_inode)
4871                 nfs4_inode_return_delegation(new_inode);
4872         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4873         res->server = NFS_SB(old_dentry->d_sb);
4874         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4875 }
4876
4877 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4878 {
4879         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4880                         &data->args.seq_args,
4881                         &data->res.seq_res,
4882                         task);
4883 }
4884
4885 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4886                                  struct inode *new_dir)
4887 {
4888         struct nfs_renamedata *data = task->tk_calldata;
4889         struct nfs_renameres *res = &data->res;
4890
4891         if (!nfs4_sequence_done(task, &res->seq_res))
4892                 return 0;
4893         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4894                 return 0;
4895
4896         if (task->tk_status == 0) {
4897                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4898                 if (new_dir != old_dir) {
4899                         /* Note: If we moved a directory, nlink will change */
4900                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4901                                         res->old_fattr->time_start,
4902                                         NFS_INO_INVALID_NLINK |
4903                                             NFS_INO_INVALID_DATA);
4904                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4905                                         res->new_fattr->time_start,
4906                                         NFS_INO_INVALID_NLINK |
4907                                             NFS_INO_INVALID_DATA);
4908                 } else
4909                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4910                                         res->old_fattr->time_start,
4911                                         NFS_INO_INVALID_DATA);
4912         }
4913         return 1;
4914 }
4915
4916 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4917 {
4918         struct nfs_server *server = NFS_SERVER(inode);
4919         __u32 bitmask[NFS4_BITMASK_SZ];
4920         struct nfs4_link_arg arg = {
4921                 .fh     = NFS_FH(inode),
4922                 .dir_fh = NFS_FH(dir),
4923                 .name   = name,
4924                 .bitmask = bitmask,
4925         };
4926         struct nfs4_link_res res = {
4927                 .server = server,
4928         };
4929         struct rpc_message msg = {
4930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4931                 .rpc_argp = &arg,
4932                 .rpc_resp = &res,
4933         };
4934         int status = -ENOMEM;
4935
4936         res.fattr = nfs_alloc_fattr_with_label(server);
4937         if (res.fattr == NULL)
4938                 goto out;
4939
4940         nfs4_inode_make_writeable(inode);
4941         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4942                                 NFS_INO_INVALID_CHANGE);
4943         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4944         if (!status) {
4945                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4946                                        NFS_INO_INVALID_DATA);
4947                 nfs4_inc_nlink(inode);
4948                 status = nfs_post_op_update_inode(inode, res.fattr);
4949                 if (!status)
4950                         nfs_setsecurity(inode, res.fattr);
4951         }
4952
4953 out:
4954         nfs_free_fattr(res.fattr);
4955         return status;
4956 }
4957
4958 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4959 {
4960         struct nfs4_exception exception = {
4961                 .interruptible = true,
4962         };
4963         int err;
4964         do {
4965                 err = nfs4_handle_exception(NFS_SERVER(inode),
4966                                 _nfs4_proc_link(inode, dir, name),
4967                                 &exception);
4968         } while (exception.retry);
4969         return err;
4970 }
4971
4972 struct nfs4_createdata {
4973         struct rpc_message msg;
4974         struct nfs4_create_arg arg;
4975         struct nfs4_create_res res;
4976         struct nfs_fh fh;
4977         struct nfs_fattr fattr;
4978 };
4979
4980 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4981                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4982 {
4983         struct nfs4_createdata *data;
4984
4985         data = kzalloc(sizeof(*data), GFP_KERNEL);
4986         if (data != NULL) {
4987                 struct nfs_server *server = NFS_SERVER(dir);
4988
4989                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4990                 if (IS_ERR(data->fattr.label))
4991                         goto out_free;
4992
4993                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4994                 data->msg.rpc_argp = &data->arg;
4995                 data->msg.rpc_resp = &data->res;
4996                 data->arg.dir_fh = NFS_FH(dir);
4997                 data->arg.server = server;
4998                 data->arg.name = name;
4999                 data->arg.attrs = sattr;
5000                 data->arg.ftype = ftype;
5001                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5002                 data->arg.umask = current_umask();
5003                 data->res.server = server;
5004                 data->res.fh = &data->fh;
5005                 data->res.fattr = &data->fattr;
5006                 nfs_fattr_init(data->res.fattr);
5007         }
5008         return data;
5009 out_free:
5010         kfree(data);
5011         return NULL;
5012 }
5013
5014 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5015 {
5016         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5017                                     &data->arg.seq_args, &data->res.seq_res, 1);
5018         if (status == 0) {
5019                 spin_lock(&dir->i_lock);
5020                 /* Creating a directory bumps nlink in the parent */
5021                 if (data->arg.ftype == NF4DIR)
5022                         nfs4_inc_nlink_locked(dir);
5023                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5024                                               data->res.fattr->time_start,
5025                                               NFS_INO_INVALID_DATA);
5026                 spin_unlock(&dir->i_lock);
5027                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5028         }
5029         return status;
5030 }
5031
5032 static void nfs4_free_createdata(struct nfs4_createdata *data)
5033 {
5034         nfs4_label_free(data->fattr.label);
5035         kfree(data);
5036 }
5037
5038 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5039                 struct page *page, unsigned int len, struct iattr *sattr,
5040                 struct nfs4_label *label)
5041 {
5042         struct nfs4_createdata *data;
5043         int status = -ENAMETOOLONG;
5044
5045         if (len > NFS4_MAXPATHLEN)
5046                 goto out;
5047
5048         status = -ENOMEM;
5049         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5050         if (data == NULL)
5051                 goto out;
5052
5053         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5054         data->arg.u.symlink.pages = &page;
5055         data->arg.u.symlink.len = len;
5056         data->arg.label = label;
5057
5058         status = nfs4_do_create(dir, dentry, data);
5059
5060         nfs4_free_createdata(data);
5061 out:
5062         return status;
5063 }
5064
5065 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5066                 struct page *page, unsigned int len, struct iattr *sattr)
5067 {
5068         struct nfs4_exception exception = {
5069                 .interruptible = true,
5070         };
5071         struct nfs4_label l, *label;
5072         int err;
5073
5074         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5075
5076         do {
5077                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5078                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5079                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5080                                 &exception);
5081         } while (exception.retry);
5082
5083         nfs4_label_release_security(label);
5084         return err;
5085 }
5086
5087 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5088                 struct iattr *sattr, struct nfs4_label *label)
5089 {
5090         struct nfs4_createdata *data;
5091         int status = -ENOMEM;
5092
5093         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5094         if (data == NULL)
5095                 goto out;
5096
5097         data->arg.label = label;
5098         status = nfs4_do_create(dir, dentry, data);
5099
5100         nfs4_free_createdata(data);
5101 out:
5102         return status;
5103 }
5104
5105 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5106                 struct iattr *sattr)
5107 {
5108         struct nfs_server *server = NFS_SERVER(dir);
5109         struct nfs4_exception exception = {
5110                 .interruptible = true,
5111         };
5112         struct nfs4_label l, *label;
5113         int err;
5114
5115         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5116
5117         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5118                 sattr->ia_mode &= ~current_umask();
5119         do {
5120                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5121                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5122                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5123                                 &exception);
5124         } while (exception.retry);
5125         nfs4_label_release_security(label);
5126
5127         return err;
5128 }
5129
5130 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5131                               struct nfs_readdir_res *nr_res)
5132 {
5133         struct inode            *dir = d_inode(nr_arg->dentry);
5134         struct nfs_server       *server = NFS_SERVER(dir);
5135         struct nfs4_readdir_arg args = {
5136                 .fh = NFS_FH(dir),
5137                 .pages = nr_arg->pages,
5138                 .pgbase = 0,
5139                 .count = nr_arg->page_len,
5140                 .plus = nr_arg->plus,
5141         };
5142         struct nfs4_readdir_res res;
5143         struct rpc_message msg = {
5144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5145                 .rpc_argp = &args,
5146                 .rpc_resp = &res,
5147                 .rpc_cred = nr_arg->cred,
5148         };
5149         int                     status;
5150
5151         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5152                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5153         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5154                 args.bitmask = server->attr_bitmask_nl;
5155         else
5156                 args.bitmask = server->attr_bitmask;
5157
5158         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5159         res.pgbase = args.pgbase;
5160         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5161                         &res.seq_res, 0);
5162         if (status >= 0) {
5163                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5164                 status += args.pgbase;
5165         }
5166
5167         nfs_invalidate_atime(dir);
5168
5169         dprintk("%s: returns %d\n", __func__, status);
5170         return status;
5171 }
5172
5173 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5174                              struct nfs_readdir_res *res)
5175 {
5176         struct nfs4_exception exception = {
5177                 .interruptible = true,
5178         };
5179         int err;
5180         do {
5181                 err = _nfs4_proc_readdir(arg, res);
5182                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5183                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5184                                             err, &exception);
5185         } while (exception.retry);
5186         return err;
5187 }
5188
5189 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5190                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5191 {
5192         struct nfs4_createdata *data;
5193         int mode = sattr->ia_mode;
5194         int status = -ENOMEM;
5195
5196         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5197         if (data == NULL)
5198                 goto out;
5199
5200         if (S_ISFIFO(mode))
5201                 data->arg.ftype = NF4FIFO;
5202         else if (S_ISBLK(mode)) {
5203                 data->arg.ftype = NF4BLK;
5204                 data->arg.u.device.specdata1 = MAJOR(rdev);
5205                 data->arg.u.device.specdata2 = MINOR(rdev);
5206         }
5207         else if (S_ISCHR(mode)) {
5208                 data->arg.ftype = NF4CHR;
5209                 data->arg.u.device.specdata1 = MAJOR(rdev);
5210                 data->arg.u.device.specdata2 = MINOR(rdev);
5211         } else if (!S_ISSOCK(mode)) {
5212                 status = -EINVAL;
5213                 goto out_free;
5214         }
5215
5216         data->arg.label = label;
5217         status = nfs4_do_create(dir, dentry, data);
5218 out_free:
5219         nfs4_free_createdata(data);
5220 out:
5221         return status;
5222 }
5223
5224 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5225                 struct iattr *sattr, dev_t rdev)
5226 {
5227         struct nfs_server *server = NFS_SERVER(dir);
5228         struct nfs4_exception exception = {
5229                 .interruptible = true,
5230         };
5231         struct nfs4_label l, *label;
5232         int err;
5233
5234         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5235
5236         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5237                 sattr->ia_mode &= ~current_umask();
5238         do {
5239                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5240                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5241                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5242                                 &exception);
5243         } while (exception.retry);
5244
5245         nfs4_label_release_security(label);
5246
5247         return err;
5248 }
5249
5250 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5251                  struct nfs_fsstat *fsstat)
5252 {
5253         struct nfs4_statfs_arg args = {
5254                 .fh = fhandle,
5255                 .bitmask = server->attr_bitmask,
5256         };
5257         struct nfs4_statfs_res res = {
5258                 .fsstat = fsstat,
5259         };
5260         struct rpc_message msg = {
5261                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5262                 .rpc_argp = &args,
5263                 .rpc_resp = &res,
5264         };
5265
5266         nfs_fattr_init(fsstat->fattr);
5267         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5268 }
5269
5270 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5271 {
5272         struct nfs4_exception exception = {
5273                 .interruptible = true,
5274         };
5275         int err;
5276         do {
5277                 err = nfs4_handle_exception(server,
5278                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5279                                 &exception);
5280         } while (exception.retry);
5281         return err;
5282 }
5283
5284 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5285                 struct nfs_fsinfo *fsinfo)
5286 {
5287         struct nfs4_fsinfo_arg args = {
5288                 .fh = fhandle,
5289                 .bitmask = server->attr_bitmask,
5290         };
5291         struct nfs4_fsinfo_res res = {
5292                 .fsinfo = fsinfo,
5293         };
5294         struct rpc_message msg = {
5295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5296                 .rpc_argp = &args,
5297                 .rpc_resp = &res,
5298         };
5299
5300         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5301 }
5302
5303 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5304 {
5305         struct nfs4_exception exception = {
5306                 .interruptible = true,
5307         };
5308         int err;
5309
5310         do {
5311                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5312                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5313                 if (err == 0) {
5314                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5315                         break;
5316                 }
5317                 err = nfs4_handle_exception(server, err, &exception);
5318         } while (exception.retry);
5319         return err;
5320 }
5321
5322 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5323 {
5324         int error;
5325
5326         nfs_fattr_init(fsinfo->fattr);
5327         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5328         if (error == 0) {
5329                 /* block layout checks this! */
5330                 server->pnfs_blksize = fsinfo->blksize;
5331                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5332         }
5333
5334         return error;
5335 }
5336
5337 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5338                 struct nfs_pathconf *pathconf)
5339 {
5340         struct nfs4_pathconf_arg args = {
5341                 .fh = fhandle,
5342                 .bitmask = server->attr_bitmask,
5343         };
5344         struct nfs4_pathconf_res res = {
5345                 .pathconf = pathconf,
5346         };
5347         struct rpc_message msg = {
5348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5349                 .rpc_argp = &args,
5350                 .rpc_resp = &res,
5351         };
5352
5353         /* None of the pathconf attributes are mandatory to implement */
5354         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5355                 memset(pathconf, 0, sizeof(*pathconf));
5356                 return 0;
5357         }
5358
5359         nfs_fattr_init(pathconf->fattr);
5360         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5361 }
5362
5363 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5364                 struct nfs_pathconf *pathconf)
5365 {
5366         struct nfs4_exception exception = {
5367                 .interruptible = true,
5368         };
5369         int err;
5370
5371         do {
5372                 err = nfs4_handle_exception(server,
5373                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5374                                 &exception);
5375         } while (exception.retry);
5376         return err;
5377 }
5378
5379 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5380                 const struct nfs_open_context *ctx,
5381                 const struct nfs_lock_context *l_ctx,
5382                 fmode_t fmode)
5383 {
5384         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5385 }
5386 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5387
5388 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5389                 const struct nfs_open_context *ctx,
5390                 const struct nfs_lock_context *l_ctx,
5391                 fmode_t fmode)
5392 {
5393         nfs4_stateid _current_stateid;
5394
5395         /* If the current stateid represents a lost lock, then exit */
5396         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5397                 return true;
5398         return nfs4_stateid_match(stateid, &_current_stateid);
5399 }
5400
5401 static bool nfs4_error_stateid_expired(int err)
5402 {
5403         switch (err) {
5404         case -NFS4ERR_DELEG_REVOKED:
5405         case -NFS4ERR_ADMIN_REVOKED:
5406         case -NFS4ERR_BAD_STATEID:
5407         case -NFS4ERR_STALE_STATEID:
5408         case -NFS4ERR_OLD_STATEID:
5409         case -NFS4ERR_OPENMODE:
5410         case -NFS4ERR_EXPIRED:
5411                 return true;
5412         }
5413         return false;
5414 }
5415
5416 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5417 {
5418         struct nfs_server *server = NFS_SERVER(hdr->inode);
5419
5420         trace_nfs4_read(hdr, task->tk_status);
5421         if (task->tk_status < 0) {
5422                 struct nfs4_exception exception = {
5423                         .inode = hdr->inode,
5424                         .state = hdr->args.context->state,
5425                         .stateid = &hdr->args.stateid,
5426                 };
5427                 task->tk_status = nfs4_async_handle_exception(task,
5428                                 server, task->tk_status, &exception);
5429                 if (exception.retry) {
5430                         rpc_restart_call_prepare(task);
5431                         return -EAGAIN;
5432                 }
5433         }
5434
5435         if (task->tk_status > 0)
5436                 renew_lease(server, hdr->timestamp);
5437         return 0;
5438 }
5439
5440 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5441                 struct nfs_pgio_args *args)
5442 {
5443
5444         if (!nfs4_error_stateid_expired(task->tk_status) ||
5445                 nfs4_stateid_is_current(&args->stateid,
5446                                 args->context,
5447                                 args->lock_context,
5448                                 FMODE_READ))
5449                 return false;
5450         rpc_restart_call_prepare(task);
5451         return true;
5452 }
5453
5454 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5455                                          struct nfs_pgio_header *hdr)
5456 {
5457         struct nfs_server *server = NFS_SERVER(hdr->inode);
5458         struct rpc_message *msg = &task->tk_msg;
5459
5460         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5461             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5462                 server->caps &= ~NFS_CAP_READ_PLUS;
5463                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5464                 rpc_restart_call_prepare(task);
5465                 return true;
5466         }
5467         return false;
5468 }
5469
5470 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5471 {
5472         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5473                 return -EAGAIN;
5474         if (nfs4_read_stateid_changed(task, &hdr->args))
5475                 return -EAGAIN;
5476         if (nfs4_read_plus_not_supported(task, hdr))
5477                 return -EAGAIN;
5478         if (task->tk_status > 0)
5479                 nfs_invalidate_atime(hdr->inode);
5480         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5481                                     nfs4_read_done_cb(task, hdr);
5482 }
5483
5484 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5485 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5486                                     struct rpc_message *msg)
5487 {
5488         /* Note: We don't use READ_PLUS with pNFS yet */
5489         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5490                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5491                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5492         }
5493         return false;
5494 }
5495 #else
5496 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5497                                     struct rpc_message *msg)
5498 {
5499         return false;
5500 }
5501 #endif /* CONFIG_NFS_V4_2 */
5502
5503 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5504                                  struct rpc_message *msg)
5505 {
5506         hdr->timestamp   = jiffies;
5507         if (!hdr->pgio_done_cb)
5508                 hdr->pgio_done_cb = nfs4_read_done_cb;
5509         if (!nfs42_read_plus_support(hdr, msg))
5510                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5511         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5512 }
5513
5514 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5515                                       struct nfs_pgio_header *hdr)
5516 {
5517         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5518                         &hdr->args.seq_args,
5519                         &hdr->res.seq_res,
5520                         task))
5521                 return 0;
5522         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5523                                 hdr->args.lock_context,
5524                                 hdr->rw_mode) == -EIO)
5525                 return -EIO;
5526         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5527                 return -EIO;
5528         return 0;
5529 }
5530
5531 static int nfs4_write_done_cb(struct rpc_task *task,
5532                               struct nfs_pgio_header *hdr)
5533 {
5534         struct inode *inode = hdr->inode;
5535
5536         trace_nfs4_write(hdr, task->tk_status);
5537         if (task->tk_status < 0) {
5538                 struct nfs4_exception exception = {
5539                         .inode = hdr->inode,
5540                         .state = hdr->args.context->state,
5541                         .stateid = &hdr->args.stateid,
5542                 };
5543                 task->tk_status = nfs4_async_handle_exception(task,
5544                                 NFS_SERVER(inode), task->tk_status,
5545                                 &exception);
5546                 if (exception.retry) {
5547                         rpc_restart_call_prepare(task);
5548                         return -EAGAIN;
5549                 }
5550         }
5551         if (task->tk_status >= 0) {
5552                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5553                 nfs_writeback_update_inode(hdr);
5554         }
5555         return 0;
5556 }
5557
5558 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5559                 struct nfs_pgio_args *args)
5560 {
5561
5562         if (!nfs4_error_stateid_expired(task->tk_status) ||
5563                 nfs4_stateid_is_current(&args->stateid,
5564                                 args->context,
5565                                 args->lock_context,
5566                                 FMODE_WRITE))
5567                 return false;
5568         rpc_restart_call_prepare(task);
5569         return true;
5570 }
5571
5572 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5573 {
5574         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5575                 return -EAGAIN;
5576         if (nfs4_write_stateid_changed(task, &hdr->args))
5577                 return -EAGAIN;
5578         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5579                 nfs4_write_done_cb(task, hdr);
5580 }
5581
5582 static
5583 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5584 {
5585         /* Don't request attributes for pNFS or O_DIRECT writes */
5586         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5587                 return false;
5588         /* Otherwise, request attributes if and only if we don't hold
5589          * a delegation
5590          */
5591         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5592 }
5593
5594 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5595                       struct inode *inode, unsigned long cache_validity)
5596 {
5597         struct nfs_server *server = NFS_SERVER(inode);
5598         unsigned int i;
5599
5600         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5601         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5602
5603         if (cache_validity & NFS_INO_INVALID_CHANGE)
5604                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5605         if (cache_validity & NFS_INO_INVALID_ATIME)
5606                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5607         if (cache_validity & NFS_INO_INVALID_MODE)
5608                 bitmask[1] |= FATTR4_WORD1_MODE;
5609         if (cache_validity & NFS_INO_INVALID_OTHER)
5610                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5611         if (cache_validity & NFS_INO_INVALID_NLINK)
5612                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5613         if (cache_validity & NFS_INO_INVALID_CTIME)
5614                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5615         if (cache_validity & NFS_INO_INVALID_MTIME)
5616                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5617         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5618                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5619
5620         if (cache_validity & NFS_INO_INVALID_SIZE)
5621                 bitmask[0] |= FATTR4_WORD0_SIZE;
5622
5623         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5624                 bitmask[i] &= server->attr_bitmask[i];
5625 }
5626
5627 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5628                                   struct rpc_message *msg,
5629                                   struct rpc_clnt **clnt)
5630 {
5631         struct nfs_server *server = NFS_SERVER(hdr->inode);
5632
5633         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5634                 hdr->args.bitmask = NULL;
5635                 hdr->res.fattr = NULL;
5636         } else {
5637                 nfs4_bitmask_set(hdr->args.bitmask_store,
5638                                  server->cache_consistency_bitmask,
5639                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5640                 hdr->args.bitmask = hdr->args.bitmask_store;
5641         }
5642
5643         if (!hdr->pgio_done_cb)
5644                 hdr->pgio_done_cb = nfs4_write_done_cb;
5645         hdr->res.server = server;
5646         hdr->timestamp   = jiffies;
5647
5648         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5649         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5650         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5651 }
5652
5653 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5654 {
5655         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5656                         &data->args.seq_args,
5657                         &data->res.seq_res,
5658                         task);
5659 }
5660
5661 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5662 {
5663         struct inode *inode = data->inode;
5664
5665         trace_nfs4_commit(data, task->tk_status);
5666         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5667                                     NULL, NULL) == -EAGAIN) {
5668                 rpc_restart_call_prepare(task);
5669                 return -EAGAIN;
5670         }
5671         return 0;
5672 }
5673
5674 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5675 {
5676         if (!nfs4_sequence_done(task, &data->res.seq_res))
5677                 return -EAGAIN;
5678         return data->commit_done_cb(task, data);
5679 }
5680
5681 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5682                                    struct rpc_clnt **clnt)
5683 {
5684         struct nfs_server *server = NFS_SERVER(data->inode);
5685
5686         if (data->commit_done_cb == NULL)
5687                 data->commit_done_cb = nfs4_commit_done_cb;
5688         data->res.server = server;
5689         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5690         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5691         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5692 }
5693
5694 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5695                                 struct nfs_commitres *res)
5696 {
5697         struct inode *dst_inode = file_inode(dst);
5698         struct nfs_server *server = NFS_SERVER(dst_inode);
5699         struct rpc_message msg = {
5700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5701                 .rpc_argp = args,
5702                 .rpc_resp = res,
5703         };
5704
5705         args->fh = NFS_FH(dst_inode);
5706         return nfs4_call_sync(server->client, server, &msg,
5707                         &args->seq_args, &res->seq_res, 1);
5708 }
5709
5710 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5711 {
5712         struct nfs_commitargs args = {
5713                 .offset = offset,
5714                 .count = count,
5715         };
5716         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5717         struct nfs4_exception exception = { };
5718         int status;
5719
5720         do {
5721                 status = _nfs4_proc_commit(dst, &args, res);
5722                 status = nfs4_handle_exception(dst_server, status, &exception);
5723         } while (exception.retry);
5724
5725         return status;
5726 }
5727
5728 struct nfs4_renewdata {
5729         struct nfs_client       *client;
5730         unsigned long           timestamp;
5731 };
5732
5733 /*
5734  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5735  * standalone procedure for queueing an asynchronous RENEW.
5736  */
5737 static void nfs4_renew_release(void *calldata)
5738 {
5739         struct nfs4_renewdata *data = calldata;
5740         struct nfs_client *clp = data->client;
5741
5742         if (refcount_read(&clp->cl_count) > 1)
5743                 nfs4_schedule_state_renewal(clp);
5744         nfs_put_client(clp);
5745         kfree(data);
5746 }
5747
5748 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5749 {
5750         struct nfs4_renewdata *data = calldata;
5751         struct nfs_client *clp = data->client;
5752         unsigned long timestamp = data->timestamp;
5753
5754         trace_nfs4_renew_async(clp, task->tk_status);
5755         switch (task->tk_status) {
5756         case 0:
5757                 break;
5758         case -NFS4ERR_LEASE_MOVED:
5759                 nfs4_schedule_lease_moved_recovery(clp);
5760                 break;
5761         default:
5762                 /* Unless we're shutting down, schedule state recovery! */
5763                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5764                         return;
5765                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5766                         nfs4_schedule_lease_recovery(clp);
5767                         return;
5768                 }
5769                 nfs4_schedule_path_down_recovery(clp);
5770         }
5771         do_renew_lease(clp, timestamp);
5772 }
5773
5774 static const struct rpc_call_ops nfs4_renew_ops = {
5775         .rpc_call_done = nfs4_renew_done,
5776         .rpc_release = nfs4_renew_release,
5777 };
5778
5779 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5780 {
5781         struct rpc_message msg = {
5782                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5783                 .rpc_argp       = clp,
5784                 .rpc_cred       = cred,
5785         };
5786         struct nfs4_renewdata *data;
5787
5788         if (renew_flags == 0)
5789                 return 0;
5790         if (!refcount_inc_not_zero(&clp->cl_count))
5791                 return -EIO;
5792         data = kmalloc(sizeof(*data), GFP_NOFS);
5793         if (data == NULL) {
5794                 nfs_put_client(clp);
5795                 return -ENOMEM;
5796         }
5797         data->client = clp;
5798         data->timestamp = jiffies;
5799         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5800                         &nfs4_renew_ops, data);
5801 }
5802
5803 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5804 {
5805         struct rpc_message msg = {
5806                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5807                 .rpc_argp       = clp,
5808                 .rpc_cred       = cred,
5809         };
5810         unsigned long now = jiffies;
5811         int status;
5812
5813         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5814         if (status < 0)
5815                 return status;
5816         do_renew_lease(clp, now);
5817         return 0;
5818 }
5819
5820 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5821                                       enum nfs4_acl_type type)
5822 {
5823         switch (type) {
5824         default:
5825                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5826         case NFS4ACL_DACL:
5827                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5828         case NFS4ACL_SACL:
5829                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5830         }
5831 }
5832
5833 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5834  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5835  * the stack.
5836  */
5837 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5838
5839 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5840                 struct page **pages)
5841 {
5842         struct page *newpage, **spages;
5843         int rc = 0;
5844         size_t len;
5845         spages = pages;
5846
5847         do {
5848                 len = min_t(size_t, PAGE_SIZE, buflen);
5849                 newpage = alloc_page(GFP_KERNEL);
5850
5851                 if (newpage == NULL)
5852                         goto unwind;
5853                 memcpy(page_address(newpage), buf, len);
5854                 buf += len;
5855                 buflen -= len;
5856                 *pages++ = newpage;
5857                 rc++;
5858         } while (buflen != 0);
5859
5860         return rc;
5861
5862 unwind:
5863         for(; rc > 0; rc--)
5864                 __free_page(spages[rc-1]);
5865         return -ENOMEM;
5866 }
5867
5868 struct nfs4_cached_acl {
5869         enum nfs4_acl_type type;
5870         int cached;
5871         size_t len;
5872         char data[];
5873 };
5874
5875 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5876 {
5877         struct nfs_inode *nfsi = NFS_I(inode);
5878
5879         spin_lock(&inode->i_lock);
5880         kfree(nfsi->nfs4_acl);
5881         nfsi->nfs4_acl = acl;
5882         spin_unlock(&inode->i_lock);
5883 }
5884
5885 static void nfs4_zap_acl_attr(struct inode *inode)
5886 {
5887         nfs4_set_cached_acl(inode, NULL);
5888 }
5889
5890 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5891                                     size_t buflen, enum nfs4_acl_type type)
5892 {
5893         struct nfs_inode *nfsi = NFS_I(inode);
5894         struct nfs4_cached_acl *acl;
5895         int ret = -ENOENT;
5896
5897         spin_lock(&inode->i_lock);
5898         acl = nfsi->nfs4_acl;
5899         if (acl == NULL)
5900                 goto out;
5901         if (acl->type != type)
5902                 goto out;
5903         if (buf == NULL) /* user is just asking for length */
5904                 goto out_len;
5905         if (acl->cached == 0)
5906                 goto out;
5907         ret = -ERANGE; /* see getxattr(2) man page */
5908         if (acl->len > buflen)
5909                 goto out;
5910         memcpy(buf, acl->data, acl->len);
5911 out_len:
5912         ret = acl->len;
5913 out:
5914         spin_unlock(&inode->i_lock);
5915         return ret;
5916 }
5917
5918 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5919                                   size_t pgbase, size_t acl_len,
5920                                   enum nfs4_acl_type type)
5921 {
5922         struct nfs4_cached_acl *acl;
5923         size_t buflen = sizeof(*acl) + acl_len;
5924
5925         if (buflen <= PAGE_SIZE) {
5926                 acl = kmalloc(buflen, GFP_KERNEL);
5927                 if (acl == NULL)
5928                         goto out;
5929                 acl->cached = 1;
5930                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5931         } else {
5932                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5933                 if (acl == NULL)
5934                         goto out;
5935                 acl->cached = 0;
5936         }
5937         acl->type = type;
5938         acl->len = acl_len;
5939 out:
5940         nfs4_set_cached_acl(inode, acl);
5941 }
5942
5943 /*
5944  * The getxattr API returns the required buffer length when called with a
5945  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5946  * the required buf.  On a NULL buf, we send a page of data to the server
5947  * guessing that the ACL request can be serviced by a page. If so, we cache
5948  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5949  * the cache. If not so, we throw away the page, and cache the required
5950  * length. The next getxattr call will then produce another round trip to
5951  * the server, this time with the input buf of the required size.
5952  */
5953 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5954                                        size_t buflen, enum nfs4_acl_type type)
5955 {
5956         struct page **pages;
5957         struct nfs_getaclargs args = {
5958                 .fh = NFS_FH(inode),
5959                 .acl_type = type,
5960                 .acl_len = buflen,
5961         };
5962         struct nfs_getaclres res = {
5963                 .acl_type = type,
5964                 .acl_len = buflen,
5965         };
5966         struct rpc_message msg = {
5967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5968                 .rpc_argp = &args,
5969                 .rpc_resp = &res,
5970         };
5971         unsigned int npages;
5972         int ret = -ENOMEM, i;
5973         struct nfs_server *server = NFS_SERVER(inode);
5974
5975         if (buflen == 0)
5976                 buflen = server->rsize;
5977
5978         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5979         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5980         if (!pages)
5981                 return -ENOMEM;
5982
5983         args.acl_pages = pages;
5984
5985         for (i = 0; i < npages; i++) {
5986                 pages[i] = alloc_page(GFP_KERNEL);
5987                 if (!pages[i])
5988                         goto out_free;
5989         }
5990
5991         /* for decoding across pages */
5992         res.acl_scratch = alloc_page(GFP_KERNEL);
5993         if (!res.acl_scratch)
5994                 goto out_free;
5995
5996         args.acl_len = npages * PAGE_SIZE;
5997
5998         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5999                 __func__, buf, buflen, npages, args.acl_len);
6000         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6001                              &msg, &args.seq_args, &res.seq_res, 0);
6002         if (ret)
6003                 goto out_free;
6004
6005         /* Handle the case where the passed-in buffer is too short */
6006         if (res.acl_flags & NFS4_ACL_TRUNC) {
6007                 /* Did the user only issue a request for the acl length? */
6008                 if (buf == NULL)
6009                         goto out_ok;
6010                 ret = -ERANGE;
6011                 goto out_free;
6012         }
6013         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6014                               type);
6015         if (buf) {
6016                 if (res.acl_len > buflen) {
6017                         ret = -ERANGE;
6018                         goto out_free;
6019                 }
6020                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6021         }
6022 out_ok:
6023         ret = res.acl_len;
6024 out_free:
6025         while (--i >= 0)
6026                 __free_page(pages[i]);
6027         if (res.acl_scratch)
6028                 __free_page(res.acl_scratch);
6029         kfree(pages);
6030         return ret;
6031 }
6032
6033 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6034                                      size_t buflen, enum nfs4_acl_type type)
6035 {
6036         struct nfs4_exception exception = {
6037                 .interruptible = true,
6038         };
6039         ssize_t ret;
6040         do {
6041                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6042                 trace_nfs4_get_acl(inode, ret);
6043                 if (ret >= 0)
6044                         break;
6045                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6046         } while (exception.retry);
6047         return ret;
6048 }
6049
6050 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6051                                  enum nfs4_acl_type type)
6052 {
6053         struct nfs_server *server = NFS_SERVER(inode);
6054         int ret;
6055
6056         if (!nfs4_server_supports_acls(server, type))
6057                 return -EOPNOTSUPP;
6058         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6059         if (ret < 0)
6060                 return ret;
6061         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6062                 nfs_zap_acl_cache(inode);
6063         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6064         if (ret != -ENOENT)
6065                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6066                  * but no cached acl data, just the acl length */
6067                 return ret;
6068         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6069 }
6070
6071 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6072                                size_t buflen, enum nfs4_acl_type type)
6073 {
6074         struct nfs_server *server = NFS_SERVER(inode);
6075         struct page *pages[NFS4ACL_MAXPAGES];
6076         struct nfs_setaclargs arg = {
6077                 .fh = NFS_FH(inode),
6078                 .acl_type = type,
6079                 .acl_len = buflen,
6080                 .acl_pages = pages,
6081         };
6082         struct nfs_setaclres res;
6083         struct rpc_message msg = {
6084                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6085                 .rpc_argp       = &arg,
6086                 .rpc_resp       = &res,
6087         };
6088         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6089         int ret, i;
6090
6091         /* You can't remove system.nfs4_acl: */
6092         if (buflen == 0)
6093                 return -EINVAL;
6094         if (!nfs4_server_supports_acls(server, type))
6095                 return -EOPNOTSUPP;
6096         if (npages > ARRAY_SIZE(pages))
6097                 return -ERANGE;
6098         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6099         if (i < 0)
6100                 return i;
6101         nfs4_inode_make_writeable(inode);
6102         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6103
6104         /*
6105          * Free each page after tx, so the only ref left is
6106          * held by the network stack
6107          */
6108         for (; i > 0; i--)
6109                 put_page(pages[i-1]);
6110
6111         /*
6112          * Acl update can result in inode attribute update.
6113          * so mark the attribute cache invalid.
6114          */
6115         spin_lock(&inode->i_lock);
6116         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6117                                              NFS_INO_INVALID_CTIME |
6118                                              NFS_INO_REVAL_FORCED);
6119         spin_unlock(&inode->i_lock);
6120         nfs_access_zap_cache(inode);
6121         nfs_zap_acl_cache(inode);
6122         return ret;
6123 }
6124
6125 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6126                              size_t buflen, enum nfs4_acl_type type)
6127 {
6128         struct nfs4_exception exception = { };
6129         int err;
6130         do {
6131                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6132                 trace_nfs4_set_acl(inode, err);
6133                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6134                         /*
6135                          * no need to retry since the kernel
6136                          * isn't involved in encoding the ACEs.
6137                          */
6138                         err = -EINVAL;
6139                         break;
6140                 }
6141                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6142                                 &exception);
6143         } while (exception.retry);
6144         return err;
6145 }
6146
6147 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6148 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6149                                         size_t buflen)
6150 {
6151         struct nfs_server *server = NFS_SERVER(inode);
6152         struct nfs4_label label = {0, 0, buflen, buf};
6153
6154         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6155         struct nfs_fattr fattr = {
6156                 .label = &label,
6157         };
6158         struct nfs4_getattr_arg arg = {
6159                 .fh             = NFS_FH(inode),
6160                 .bitmask        = bitmask,
6161         };
6162         struct nfs4_getattr_res res = {
6163                 .fattr          = &fattr,
6164                 .server         = server,
6165         };
6166         struct rpc_message msg = {
6167                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6168                 .rpc_argp       = &arg,
6169                 .rpc_resp       = &res,
6170         };
6171         int ret;
6172
6173         nfs_fattr_init(&fattr);
6174
6175         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6176         if (ret)
6177                 return ret;
6178         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6179                 return -ENOENT;
6180         return label.len;
6181 }
6182
6183 static int nfs4_get_security_label(struct inode *inode, void *buf,
6184                                         size_t buflen)
6185 {
6186         struct nfs4_exception exception = {
6187                 .interruptible = true,
6188         };
6189         int err;
6190
6191         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6192                 return -EOPNOTSUPP;
6193
6194         do {
6195                 err = _nfs4_get_security_label(inode, buf, buflen);
6196                 trace_nfs4_get_security_label(inode, err);
6197                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6198                                 &exception);
6199         } while (exception.retry);
6200         return err;
6201 }
6202
6203 static int _nfs4_do_set_security_label(struct inode *inode,
6204                 struct nfs4_label *ilabel,
6205                 struct nfs_fattr *fattr)
6206 {
6207
6208         struct iattr sattr = {0};
6209         struct nfs_server *server = NFS_SERVER(inode);
6210         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6211         struct nfs_setattrargs arg = {
6212                 .fh             = NFS_FH(inode),
6213                 .iap            = &sattr,
6214                 .server         = server,
6215                 .bitmask        = bitmask,
6216                 .label          = ilabel,
6217         };
6218         struct nfs_setattrres res = {
6219                 .fattr          = fattr,
6220                 .server         = server,
6221         };
6222         struct rpc_message msg = {
6223                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6224                 .rpc_argp       = &arg,
6225                 .rpc_resp       = &res,
6226         };
6227         int status;
6228
6229         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6230
6231         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6232         if (status)
6233                 dprintk("%s failed: %d\n", __func__, status);
6234
6235         return status;
6236 }
6237
6238 static int nfs4_do_set_security_label(struct inode *inode,
6239                 struct nfs4_label *ilabel,
6240                 struct nfs_fattr *fattr)
6241 {
6242         struct nfs4_exception exception = { };
6243         int err;
6244
6245         do {
6246                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6247                 trace_nfs4_set_security_label(inode, err);
6248                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6249                                 &exception);
6250         } while (exception.retry);
6251         return err;
6252 }
6253
6254 static int
6255 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6256 {
6257         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6258         struct nfs_fattr *fattr;
6259         int status;
6260
6261         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6262                 return -EOPNOTSUPP;
6263
6264         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6265         if (fattr == NULL)
6266                 return -ENOMEM;
6267
6268         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6269         if (status == 0)
6270                 nfs_setsecurity(inode, fattr);
6271
6272         return status;
6273 }
6274 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6275
6276
6277 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6278                                     nfs4_verifier *bootverf)
6279 {
6280         __be32 verf[2];
6281
6282         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6283                 /* An impossible timestamp guarantees this value
6284                  * will never match a generated boot time. */
6285                 verf[0] = cpu_to_be32(U32_MAX);
6286                 verf[1] = cpu_to_be32(U32_MAX);
6287         } else {
6288                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6289                 u64 ns = ktime_to_ns(nn->boot_time);
6290
6291                 verf[0] = cpu_to_be32(ns >> 32);
6292                 verf[1] = cpu_to_be32(ns);
6293         }
6294         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6295 }
6296
6297 static size_t
6298 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6299 {
6300         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6301         struct nfs_netns_client *nn_clp = nn->nfs_client;
6302         const char *id;
6303
6304         buf[0] = '\0';
6305
6306         if (nn_clp) {
6307                 rcu_read_lock();
6308                 id = rcu_dereference(nn_clp->identifier);
6309                 if (id)
6310                         strscpy(buf, id, buflen);
6311                 rcu_read_unlock();
6312         }
6313
6314         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6315                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6316
6317         return strlen(buf);
6318 }
6319
6320 static int
6321 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6322 {
6323         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6324         size_t buflen;
6325         size_t len;
6326         char *str;
6327
6328         if (clp->cl_owner_id != NULL)
6329                 return 0;
6330
6331         rcu_read_lock();
6332         len = 14 +
6333                 strlen(clp->cl_rpcclient->cl_nodename) +
6334                 1 +
6335                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6336                 1;
6337         rcu_read_unlock();
6338
6339         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6340         if (buflen)
6341                 len += buflen + 1;
6342
6343         if (len > NFS4_OPAQUE_LIMIT + 1)
6344                 return -EINVAL;
6345
6346         /*
6347          * Since this string is allocated at mount time, and held until the
6348          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6349          * about a memory-reclaim deadlock.
6350          */
6351         str = kmalloc(len, GFP_KERNEL);
6352         if (!str)
6353                 return -ENOMEM;
6354
6355         rcu_read_lock();
6356         if (buflen)
6357                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6358                           clp->cl_rpcclient->cl_nodename, buf,
6359                           rpc_peeraddr2str(clp->cl_rpcclient,
6360                                            RPC_DISPLAY_ADDR));
6361         else
6362                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6363                           clp->cl_rpcclient->cl_nodename,
6364                           rpc_peeraddr2str(clp->cl_rpcclient,
6365                                            RPC_DISPLAY_ADDR));
6366         rcu_read_unlock();
6367
6368         clp->cl_owner_id = str;
6369         return 0;
6370 }
6371
6372 static int
6373 nfs4_init_uniform_client_string(struct nfs_client *clp)
6374 {
6375         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6376         size_t buflen;
6377         size_t len;
6378         char *str;
6379
6380         if (clp->cl_owner_id != NULL)
6381                 return 0;
6382
6383         len = 10 + 10 + 1 + 10 + 1 +
6384                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6385
6386         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6387         if (buflen)
6388                 len += buflen + 1;
6389
6390         if (len > NFS4_OPAQUE_LIMIT + 1)
6391                 return -EINVAL;
6392
6393         /*
6394          * Since this string is allocated at mount time, and held until the
6395          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6396          * about a memory-reclaim deadlock.
6397          */
6398         str = kmalloc(len, GFP_KERNEL);
6399         if (!str)
6400                 return -ENOMEM;
6401
6402         if (buflen)
6403                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6404                           clp->rpc_ops->version, clp->cl_minorversion,
6405                           buf, clp->cl_rpcclient->cl_nodename);
6406         else
6407                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6408                           clp->rpc_ops->version, clp->cl_minorversion,
6409                           clp->cl_rpcclient->cl_nodename);
6410         clp->cl_owner_id = str;
6411         return 0;
6412 }
6413
6414 /*
6415  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6416  * services.  Advertise one based on the address family of the
6417  * clientaddr.
6418  */
6419 static unsigned int
6420 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6421 {
6422         if (strchr(clp->cl_ipaddr, ':') != NULL)
6423                 return scnprintf(buf, len, "tcp6");
6424         else
6425                 return scnprintf(buf, len, "tcp");
6426 }
6427
6428 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6429 {
6430         struct nfs4_setclientid *sc = calldata;
6431
6432         if (task->tk_status == 0)
6433                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6434 }
6435
6436 static const struct rpc_call_ops nfs4_setclientid_ops = {
6437         .rpc_call_done = nfs4_setclientid_done,
6438 };
6439
6440 /**
6441  * nfs4_proc_setclientid - Negotiate client ID
6442  * @clp: state data structure
6443  * @program: RPC program for NFSv4 callback service
6444  * @port: IP port number for NFS4 callback service
6445  * @cred: credential to use for this call
6446  * @res: where to place the result
6447  *
6448  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6449  */
6450 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6451                 unsigned short port, const struct cred *cred,
6452                 struct nfs4_setclientid_res *res)
6453 {
6454         nfs4_verifier sc_verifier;
6455         struct nfs4_setclientid setclientid = {
6456                 .sc_verifier = &sc_verifier,
6457                 .sc_prog = program,
6458                 .sc_clnt = clp,
6459         };
6460         struct rpc_message msg = {
6461                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6462                 .rpc_argp = &setclientid,
6463                 .rpc_resp = res,
6464                 .rpc_cred = cred,
6465         };
6466         struct rpc_task_setup task_setup_data = {
6467                 .rpc_client = clp->cl_rpcclient,
6468                 .rpc_message = &msg,
6469                 .callback_ops = &nfs4_setclientid_ops,
6470                 .callback_data = &setclientid,
6471                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6472         };
6473         unsigned long now = jiffies;
6474         int status;
6475
6476         /* nfs_client_id4 */
6477         nfs4_init_boot_verifier(clp, &sc_verifier);
6478
6479         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6480                 status = nfs4_init_uniform_client_string(clp);
6481         else
6482                 status = nfs4_init_nonuniform_client_string(clp);
6483
6484         if (status)
6485                 goto out;
6486
6487         /* cb_client4 */
6488         setclientid.sc_netid_len =
6489                                 nfs4_init_callback_netid(clp,
6490                                                 setclientid.sc_netid,
6491                                                 sizeof(setclientid.sc_netid));
6492         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6493                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6494                                 clp->cl_ipaddr, port >> 8, port & 255);
6495
6496         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6497                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6498                 clp->cl_owner_id);
6499
6500         status = nfs4_call_sync_custom(&task_setup_data);
6501         if (setclientid.sc_cred) {
6502                 kfree(clp->cl_acceptor);
6503                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6504                 put_rpccred(setclientid.sc_cred);
6505         }
6506
6507         if (status == 0)
6508                 do_renew_lease(clp, now);
6509 out:
6510         trace_nfs4_setclientid(clp, status);
6511         dprintk("NFS reply setclientid: %d\n", status);
6512         return status;
6513 }
6514
6515 /**
6516  * nfs4_proc_setclientid_confirm - Confirm client ID
6517  * @clp: state data structure
6518  * @arg: result of a previous SETCLIENTID
6519  * @cred: credential to use for this call
6520  *
6521  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6522  */
6523 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6524                 struct nfs4_setclientid_res *arg,
6525                 const struct cred *cred)
6526 {
6527         struct rpc_message msg = {
6528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6529                 .rpc_argp = arg,
6530                 .rpc_cred = cred,
6531         };
6532         int status;
6533
6534         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6535                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6536                 clp->cl_clientid);
6537         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6538                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6539         trace_nfs4_setclientid_confirm(clp, status);
6540         dprintk("NFS reply setclientid_confirm: %d\n", status);
6541         return status;
6542 }
6543
6544 struct nfs4_delegreturndata {
6545         struct nfs4_delegreturnargs args;
6546         struct nfs4_delegreturnres res;
6547         struct nfs_fh fh;
6548         nfs4_stateid stateid;
6549         unsigned long timestamp;
6550         struct {
6551                 struct nfs4_layoutreturn_args arg;
6552                 struct nfs4_layoutreturn_res res;
6553                 struct nfs4_xdr_opaque_data ld_private;
6554                 u32 roc_barrier;
6555                 bool roc;
6556         } lr;
6557         struct nfs_fattr fattr;
6558         int rpc_status;
6559         struct inode *inode;
6560 };
6561
6562 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6563 {
6564         struct nfs4_delegreturndata *data = calldata;
6565         struct nfs4_exception exception = {
6566                 .inode = data->inode,
6567                 .stateid = &data->stateid,
6568                 .task_is_privileged = data->args.seq_args.sa_privileged,
6569         };
6570
6571         if (!nfs4_sequence_done(task, &data->res.seq_res))
6572                 return;
6573
6574         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6575
6576         /* Handle Layoutreturn errors */
6577         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6578                           &data->res.lr_ret) == -EAGAIN)
6579                 goto out_restart;
6580
6581         switch (task->tk_status) {
6582         case 0:
6583                 renew_lease(data->res.server, data->timestamp);
6584                 break;
6585         case -NFS4ERR_ADMIN_REVOKED:
6586         case -NFS4ERR_DELEG_REVOKED:
6587         case -NFS4ERR_EXPIRED:
6588                 nfs4_free_revoked_stateid(data->res.server,
6589                                 data->args.stateid,
6590                                 task->tk_msg.rpc_cred);
6591                 fallthrough;
6592         case -NFS4ERR_BAD_STATEID:
6593         case -NFS4ERR_STALE_STATEID:
6594         case -ETIMEDOUT:
6595                 task->tk_status = 0;
6596                 break;
6597         case -NFS4ERR_OLD_STATEID:
6598                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6599                         nfs4_stateid_seqid_inc(&data->stateid);
6600                 if (data->args.bitmask) {
6601                         data->args.bitmask = NULL;
6602                         data->res.fattr = NULL;
6603                 }
6604                 goto out_restart;
6605         case -NFS4ERR_ACCESS:
6606                 if (data->args.bitmask) {
6607                         data->args.bitmask = NULL;
6608                         data->res.fattr = NULL;
6609                         goto out_restart;
6610                 }
6611                 fallthrough;
6612         default:
6613                 task->tk_status = nfs4_async_handle_exception(task,
6614                                 data->res.server, task->tk_status,
6615                                 &exception);
6616                 if (exception.retry)
6617                         goto out_restart;
6618         }
6619         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6620         data->rpc_status = task->tk_status;
6621         return;
6622 out_restart:
6623         task->tk_status = 0;
6624         rpc_restart_call_prepare(task);
6625 }
6626
6627 static void nfs4_delegreturn_release(void *calldata)
6628 {
6629         struct nfs4_delegreturndata *data = calldata;
6630         struct inode *inode = data->inode;
6631
6632         if (data->lr.roc)
6633                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6634                                  data->res.lr_ret);
6635         if (inode) {
6636                 nfs4_fattr_set_prechange(&data->fattr,
6637                                          inode_peek_iversion_raw(inode));
6638                 nfs_refresh_inode(inode, &data->fattr);
6639                 nfs_iput_and_deactive(inode);
6640         }
6641         kfree(calldata);
6642 }
6643
6644 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6645 {
6646         struct nfs4_delegreturndata *d_data;
6647         struct pnfs_layout_hdr *lo;
6648
6649         d_data = data;
6650
6651         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6652                 nfs4_sequence_done(task, &d_data->res.seq_res);
6653                 return;
6654         }
6655
6656         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6657         if (lo && !pnfs_layout_is_valid(lo)) {
6658                 d_data->args.lr_args = NULL;
6659                 d_data->res.lr_res = NULL;
6660         }
6661
6662         nfs4_setup_sequence(d_data->res.server->nfs_client,
6663                         &d_data->args.seq_args,
6664                         &d_data->res.seq_res,
6665                         task);
6666 }
6667
6668 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6669         .rpc_call_prepare = nfs4_delegreturn_prepare,
6670         .rpc_call_done = nfs4_delegreturn_done,
6671         .rpc_release = nfs4_delegreturn_release,
6672 };
6673
6674 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6675 {
6676         struct nfs4_delegreturndata *data;
6677         struct nfs_server *server = NFS_SERVER(inode);
6678         struct rpc_task *task;
6679         struct rpc_message msg = {
6680                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6681                 .rpc_cred = cred,
6682         };
6683         struct rpc_task_setup task_setup_data = {
6684                 .rpc_client = server->client,
6685                 .rpc_message = &msg,
6686                 .callback_ops = &nfs4_delegreturn_ops,
6687                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6688         };
6689         int status = 0;
6690
6691         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6692                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6693
6694         data = kzalloc(sizeof(*data), GFP_KERNEL);
6695         if (data == NULL)
6696                 return -ENOMEM;
6697
6698         nfs4_state_protect(server->nfs_client,
6699                         NFS_SP4_MACH_CRED_CLEANUP,
6700                         &task_setup_data.rpc_client, &msg);
6701
6702         data->args.fhandle = &data->fh;
6703         data->args.stateid = &data->stateid;
6704         nfs4_bitmask_set(data->args.bitmask_store,
6705                          server->cache_consistency_bitmask, inode, 0);
6706         data->args.bitmask = data->args.bitmask_store;
6707         nfs_copy_fh(&data->fh, NFS_FH(inode));
6708         nfs4_stateid_copy(&data->stateid, stateid);
6709         data->res.fattr = &data->fattr;
6710         data->res.server = server;
6711         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6712         data->lr.arg.ld_private = &data->lr.ld_private;
6713         nfs_fattr_init(data->res.fattr);
6714         data->timestamp = jiffies;
6715         data->rpc_status = 0;
6716         data->inode = nfs_igrab_and_active(inode);
6717         if (data->inode || issync) {
6718                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6719                                         cred);
6720                 if (data->lr.roc) {
6721                         data->args.lr_args = &data->lr.arg;
6722                         data->res.lr_res = &data->lr.res;
6723                 }
6724         }
6725
6726         if (!data->inode)
6727                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6728                                    1);
6729         else
6730                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6731                                    0);
6732         task_setup_data.callback_data = data;
6733         msg.rpc_argp = &data->args;
6734         msg.rpc_resp = &data->res;
6735         task = rpc_run_task(&task_setup_data);
6736         if (IS_ERR(task))
6737                 return PTR_ERR(task);
6738         if (!issync)
6739                 goto out;
6740         status = rpc_wait_for_completion_task(task);
6741         if (status != 0)
6742                 goto out;
6743         status = data->rpc_status;
6744 out:
6745         rpc_put_task(task);
6746         return status;
6747 }
6748
6749 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6750 {
6751         struct nfs_server *server = NFS_SERVER(inode);
6752         struct nfs4_exception exception = { };
6753         int err;
6754         do {
6755                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6756                 trace_nfs4_delegreturn(inode, stateid, err);
6757                 switch (err) {
6758                         case -NFS4ERR_STALE_STATEID:
6759                         case -NFS4ERR_EXPIRED:
6760                         case 0:
6761                                 return 0;
6762                 }
6763                 err = nfs4_handle_exception(server, err, &exception);
6764         } while (exception.retry);
6765         return err;
6766 }
6767
6768 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6769 {
6770         struct inode *inode = state->inode;
6771         struct nfs_server *server = NFS_SERVER(inode);
6772         struct nfs_client *clp = server->nfs_client;
6773         struct nfs_lockt_args arg = {
6774                 .fh = NFS_FH(inode),
6775                 .fl = request,
6776         };
6777         struct nfs_lockt_res res = {
6778                 .denied = request,
6779         };
6780         struct rpc_message msg = {
6781                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6782                 .rpc_argp       = &arg,
6783                 .rpc_resp       = &res,
6784                 .rpc_cred       = state->owner->so_cred,
6785         };
6786         struct nfs4_lock_state *lsp;
6787         int status;
6788
6789         arg.lock_owner.clientid = clp->cl_clientid;
6790         status = nfs4_set_lock_state(state, request);
6791         if (status != 0)
6792                 goto out;
6793         lsp = request->fl_u.nfs4_fl.owner;
6794         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6795         arg.lock_owner.s_dev = server->s_dev;
6796         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6797         switch (status) {
6798                 case 0:
6799                         request->fl_type = F_UNLCK;
6800                         break;
6801                 case -NFS4ERR_DENIED:
6802                         status = 0;
6803         }
6804         request->fl_ops->fl_release_private(request);
6805         request->fl_ops = NULL;
6806 out:
6807         return status;
6808 }
6809
6810 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6811 {
6812         struct nfs4_exception exception = {
6813                 .interruptible = true,
6814         };
6815         int err;
6816
6817         do {
6818                 err = _nfs4_proc_getlk(state, cmd, request);
6819                 trace_nfs4_get_lock(request, state, cmd, err);
6820                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6821                                 &exception);
6822         } while (exception.retry);
6823         return err;
6824 }
6825
6826 /*
6827  * Update the seqid of a lock stateid after receiving
6828  * NFS4ERR_OLD_STATEID
6829  */
6830 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6831                 struct nfs4_lock_state *lsp)
6832 {
6833         struct nfs4_state *state = lsp->ls_state;
6834         bool ret = false;
6835
6836         spin_lock(&state->state_lock);
6837         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6838                 goto out;
6839         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6840                 nfs4_stateid_seqid_inc(dst);
6841         else
6842                 dst->seqid = lsp->ls_stateid.seqid;
6843         ret = true;
6844 out:
6845         spin_unlock(&state->state_lock);
6846         return ret;
6847 }
6848
6849 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6850                 struct nfs4_lock_state *lsp)
6851 {
6852         struct nfs4_state *state = lsp->ls_state;
6853         bool ret;
6854
6855         spin_lock(&state->state_lock);
6856         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6857         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6858         spin_unlock(&state->state_lock);
6859         return ret;
6860 }
6861
6862 struct nfs4_unlockdata {
6863         struct nfs_locku_args arg;
6864         struct nfs_locku_res res;
6865         struct nfs4_lock_state *lsp;
6866         struct nfs_open_context *ctx;
6867         struct nfs_lock_context *l_ctx;
6868         struct file_lock fl;
6869         struct nfs_server *server;
6870         unsigned long timestamp;
6871 };
6872
6873 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6874                 struct nfs_open_context *ctx,
6875                 struct nfs4_lock_state *lsp,
6876                 struct nfs_seqid *seqid)
6877 {
6878         struct nfs4_unlockdata *p;
6879         struct nfs4_state *state = lsp->ls_state;
6880         struct inode *inode = state->inode;
6881
6882         p = kzalloc(sizeof(*p), GFP_KERNEL);
6883         if (p == NULL)
6884                 return NULL;
6885         p->arg.fh = NFS_FH(inode);
6886         p->arg.fl = &p->fl;
6887         p->arg.seqid = seqid;
6888         p->res.seqid = seqid;
6889         p->lsp = lsp;
6890         /* Ensure we don't close file until we're done freeing locks! */
6891         p->ctx = get_nfs_open_context(ctx);
6892         p->l_ctx = nfs_get_lock_context(ctx);
6893         locks_init_lock(&p->fl);
6894         locks_copy_lock(&p->fl, fl);
6895         p->server = NFS_SERVER(inode);
6896         spin_lock(&state->state_lock);
6897         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6898         spin_unlock(&state->state_lock);
6899         return p;
6900 }
6901
6902 static void nfs4_locku_release_calldata(void *data)
6903 {
6904         struct nfs4_unlockdata *calldata = data;
6905         nfs_free_seqid(calldata->arg.seqid);
6906         nfs4_put_lock_state(calldata->lsp);
6907         nfs_put_lock_context(calldata->l_ctx);
6908         put_nfs_open_context(calldata->ctx);
6909         kfree(calldata);
6910 }
6911
6912 static void nfs4_locku_done(struct rpc_task *task, void *data)
6913 {
6914         struct nfs4_unlockdata *calldata = data;
6915         struct nfs4_exception exception = {
6916                 .inode = calldata->lsp->ls_state->inode,
6917                 .stateid = &calldata->arg.stateid,
6918         };
6919
6920         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6921                 return;
6922         switch (task->tk_status) {
6923                 case 0:
6924                         renew_lease(calldata->server, calldata->timestamp);
6925                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6926                         if (nfs4_update_lock_stateid(calldata->lsp,
6927                                         &calldata->res.stateid))
6928                                 break;
6929                         fallthrough;
6930                 case -NFS4ERR_ADMIN_REVOKED:
6931                 case -NFS4ERR_EXPIRED:
6932                         nfs4_free_revoked_stateid(calldata->server,
6933                                         &calldata->arg.stateid,
6934                                         task->tk_msg.rpc_cred);
6935                         fallthrough;
6936                 case -NFS4ERR_BAD_STATEID:
6937                 case -NFS4ERR_STALE_STATEID:
6938                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6939                                                 calldata->lsp))
6940                                 rpc_restart_call_prepare(task);
6941                         break;
6942                 case -NFS4ERR_OLD_STATEID:
6943                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6944                                                 calldata->lsp))
6945                                 rpc_restart_call_prepare(task);
6946                         break;
6947                 default:
6948                         task->tk_status = nfs4_async_handle_exception(task,
6949                                         calldata->server, task->tk_status,
6950                                         &exception);
6951                         if (exception.retry)
6952                                 rpc_restart_call_prepare(task);
6953         }
6954         nfs_release_seqid(calldata->arg.seqid);
6955 }
6956
6957 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6958 {
6959         struct nfs4_unlockdata *calldata = data;
6960
6961         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6962                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6963                 return;
6964
6965         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6966                 goto out_wait;
6967         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6968                 /* Note: exit _without_ running nfs4_locku_done */
6969                 goto out_no_action;
6970         }
6971         calldata->timestamp = jiffies;
6972         if (nfs4_setup_sequence(calldata->server->nfs_client,
6973                                 &calldata->arg.seq_args,
6974                                 &calldata->res.seq_res,
6975                                 task) != 0)
6976                 nfs_release_seqid(calldata->arg.seqid);
6977         return;
6978 out_no_action:
6979         task->tk_action = NULL;
6980 out_wait:
6981         nfs4_sequence_done(task, &calldata->res.seq_res);
6982 }
6983
6984 static const struct rpc_call_ops nfs4_locku_ops = {
6985         .rpc_call_prepare = nfs4_locku_prepare,
6986         .rpc_call_done = nfs4_locku_done,
6987         .rpc_release = nfs4_locku_release_calldata,
6988 };
6989
6990 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6991                 struct nfs_open_context *ctx,
6992                 struct nfs4_lock_state *lsp,
6993                 struct nfs_seqid *seqid)
6994 {
6995         struct nfs4_unlockdata *data;
6996         struct rpc_message msg = {
6997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6998                 .rpc_cred = ctx->cred,
6999         };
7000         struct rpc_task_setup task_setup_data = {
7001                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7002                 .rpc_message = &msg,
7003                 .callback_ops = &nfs4_locku_ops,
7004                 .workqueue = nfsiod_workqueue,
7005                 .flags = RPC_TASK_ASYNC,
7006         };
7007
7008         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7009                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7010
7011         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7012                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7013
7014         /* Ensure this is an unlock - when canceling a lock, the
7015          * canceled lock is passed in, and it won't be an unlock.
7016          */
7017         fl->fl_type = F_UNLCK;
7018         if (fl->fl_flags & FL_CLOSE)
7019                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7020
7021         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7022         if (data == NULL) {
7023                 nfs_free_seqid(seqid);
7024                 return ERR_PTR(-ENOMEM);
7025         }
7026
7027         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7028         msg.rpc_argp = &data->arg;
7029         msg.rpc_resp = &data->res;
7030         task_setup_data.callback_data = data;
7031         return rpc_run_task(&task_setup_data);
7032 }
7033
7034 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7035 {
7036         struct inode *inode = state->inode;
7037         struct nfs4_state_owner *sp = state->owner;
7038         struct nfs_inode *nfsi = NFS_I(inode);
7039         struct nfs_seqid *seqid;
7040         struct nfs4_lock_state *lsp;
7041         struct rpc_task *task;
7042         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7043         int status = 0;
7044         unsigned char fl_flags = request->fl_flags;
7045
7046         status = nfs4_set_lock_state(state, request);
7047         /* Unlock _before_ we do the RPC call */
7048         request->fl_flags |= FL_EXISTS;
7049         /* Exclude nfs_delegation_claim_locks() */
7050         mutex_lock(&sp->so_delegreturn_mutex);
7051         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7052         down_read(&nfsi->rwsem);
7053         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7054                 up_read(&nfsi->rwsem);
7055                 mutex_unlock(&sp->so_delegreturn_mutex);
7056                 goto out;
7057         }
7058         lsp = request->fl_u.nfs4_fl.owner;
7059         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7060         up_read(&nfsi->rwsem);
7061         mutex_unlock(&sp->so_delegreturn_mutex);
7062         if (status != 0)
7063                 goto out;
7064         /* Is this a delegated lock? */
7065         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7066                 goto out;
7067         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7068         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7069         status = -ENOMEM;
7070         if (IS_ERR(seqid))
7071                 goto out;
7072         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7073         status = PTR_ERR(task);
7074         if (IS_ERR(task))
7075                 goto out;
7076         status = rpc_wait_for_completion_task(task);
7077         rpc_put_task(task);
7078 out:
7079         request->fl_flags = fl_flags;
7080         trace_nfs4_unlock(request, state, F_SETLK, status);
7081         return status;
7082 }
7083
7084 struct nfs4_lockdata {
7085         struct nfs_lock_args arg;
7086         struct nfs_lock_res res;
7087         struct nfs4_lock_state *lsp;
7088         struct nfs_open_context *ctx;
7089         struct file_lock fl;
7090         unsigned long timestamp;
7091         int rpc_status;
7092         int cancelled;
7093         struct nfs_server *server;
7094 };
7095
7096 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7097                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7098                 gfp_t gfp_mask)
7099 {
7100         struct nfs4_lockdata *p;
7101         struct inode *inode = lsp->ls_state->inode;
7102         struct nfs_server *server = NFS_SERVER(inode);
7103         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7104
7105         p = kzalloc(sizeof(*p), gfp_mask);
7106         if (p == NULL)
7107                 return NULL;
7108
7109         p->arg.fh = NFS_FH(inode);
7110         p->arg.fl = &p->fl;
7111         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7112         if (IS_ERR(p->arg.open_seqid))
7113                 goto out_free;
7114         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7115         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7116         if (IS_ERR(p->arg.lock_seqid))
7117                 goto out_free_seqid;
7118         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7119         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7120         p->arg.lock_owner.s_dev = server->s_dev;
7121         p->res.lock_seqid = p->arg.lock_seqid;
7122         p->lsp = lsp;
7123         p->server = server;
7124         p->ctx = get_nfs_open_context(ctx);
7125         locks_init_lock(&p->fl);
7126         locks_copy_lock(&p->fl, fl);
7127         return p;
7128 out_free_seqid:
7129         nfs_free_seqid(p->arg.open_seqid);
7130 out_free:
7131         kfree(p);
7132         return NULL;
7133 }
7134
7135 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7136 {
7137         struct nfs4_lockdata *data = calldata;
7138         struct nfs4_state *state = data->lsp->ls_state;
7139
7140         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7141                 goto out_wait;
7142         /* Do we need to do an open_to_lock_owner? */
7143         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7144                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7145                         goto out_release_lock_seqid;
7146                 }
7147                 nfs4_stateid_copy(&data->arg.open_stateid,
7148                                 &state->open_stateid);
7149                 data->arg.new_lock_owner = 1;
7150                 data->res.open_seqid = data->arg.open_seqid;
7151         } else {
7152                 data->arg.new_lock_owner = 0;
7153                 nfs4_stateid_copy(&data->arg.lock_stateid,
7154                                 &data->lsp->ls_stateid);
7155         }
7156         if (!nfs4_valid_open_stateid(state)) {
7157                 data->rpc_status = -EBADF;
7158                 task->tk_action = NULL;
7159                 goto out_release_open_seqid;
7160         }
7161         data->timestamp = jiffies;
7162         if (nfs4_setup_sequence(data->server->nfs_client,
7163                                 &data->arg.seq_args,
7164                                 &data->res.seq_res,
7165                                 task) == 0)
7166                 return;
7167 out_release_open_seqid:
7168         nfs_release_seqid(data->arg.open_seqid);
7169 out_release_lock_seqid:
7170         nfs_release_seqid(data->arg.lock_seqid);
7171 out_wait:
7172         nfs4_sequence_done(task, &data->res.seq_res);
7173         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7174 }
7175
7176 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7177 {
7178         struct nfs4_lockdata *data = calldata;
7179         struct nfs4_lock_state *lsp = data->lsp;
7180
7181         if (!nfs4_sequence_done(task, &data->res.seq_res))
7182                 return;
7183
7184         data->rpc_status = task->tk_status;
7185         switch (task->tk_status) {
7186         case 0:
7187                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7188                                 data->timestamp);
7189                 if (data->arg.new_lock && !data->cancelled) {
7190                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7191                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7192                                 goto out_restart;
7193                 }
7194                 if (data->arg.new_lock_owner != 0) {
7195                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7196                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7197                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7198                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7199                         goto out_restart;
7200                 break;
7201         case -NFS4ERR_OLD_STATEID:
7202                 if (data->arg.new_lock_owner != 0 &&
7203                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7204                                         lsp->ls_state))
7205                         goto out_restart;
7206                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7207                         goto out_restart;
7208                 fallthrough;
7209         case -NFS4ERR_BAD_STATEID:
7210         case -NFS4ERR_STALE_STATEID:
7211         case -NFS4ERR_EXPIRED:
7212                 if (data->arg.new_lock_owner != 0) {
7213                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7214                                                 &lsp->ls_state->open_stateid))
7215                                 goto out_restart;
7216                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7217                                                 &lsp->ls_stateid))
7218                                 goto out_restart;
7219         }
7220 out_done:
7221         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7222         return;
7223 out_restart:
7224         if (!data->cancelled)
7225                 rpc_restart_call_prepare(task);
7226         goto out_done;
7227 }
7228
7229 static void nfs4_lock_release(void *calldata)
7230 {
7231         struct nfs4_lockdata *data = calldata;
7232
7233         nfs_free_seqid(data->arg.open_seqid);
7234         if (data->cancelled && data->rpc_status == 0) {
7235                 struct rpc_task *task;
7236                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7237                                 data->arg.lock_seqid);
7238                 if (!IS_ERR(task))
7239                         rpc_put_task_async(task);
7240                 dprintk("%s: cancelling lock!\n", __func__);
7241         } else
7242                 nfs_free_seqid(data->arg.lock_seqid);
7243         nfs4_put_lock_state(data->lsp);
7244         put_nfs_open_context(data->ctx);
7245         kfree(data);
7246 }
7247
7248 static const struct rpc_call_ops nfs4_lock_ops = {
7249         .rpc_call_prepare = nfs4_lock_prepare,
7250         .rpc_call_done = nfs4_lock_done,
7251         .rpc_release = nfs4_lock_release,
7252 };
7253
7254 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7255 {
7256         switch (error) {
7257         case -NFS4ERR_ADMIN_REVOKED:
7258         case -NFS4ERR_EXPIRED:
7259         case -NFS4ERR_BAD_STATEID:
7260                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7261                 if (new_lock_owner != 0 ||
7262                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7263                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7264                 break;
7265         case -NFS4ERR_STALE_STATEID:
7266                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7267                 nfs4_schedule_lease_recovery(server->nfs_client);
7268         }
7269 }
7270
7271 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7272 {
7273         struct nfs4_lockdata *data;
7274         struct rpc_task *task;
7275         struct rpc_message msg = {
7276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7277                 .rpc_cred = state->owner->so_cred,
7278         };
7279         struct rpc_task_setup task_setup_data = {
7280                 .rpc_client = NFS_CLIENT(state->inode),
7281                 .rpc_message = &msg,
7282                 .callback_ops = &nfs4_lock_ops,
7283                 .workqueue = nfsiod_workqueue,
7284                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7285         };
7286         int ret;
7287
7288         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7289                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7290
7291         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7292                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7293         if (data == NULL)
7294                 return -ENOMEM;
7295         if (IS_SETLKW(cmd))
7296                 data->arg.block = 1;
7297         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7298                                 recovery_type > NFS_LOCK_NEW);
7299         msg.rpc_argp = &data->arg;
7300         msg.rpc_resp = &data->res;
7301         task_setup_data.callback_data = data;
7302         if (recovery_type > NFS_LOCK_NEW) {
7303                 if (recovery_type == NFS_LOCK_RECLAIM)
7304                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7305         } else
7306                 data->arg.new_lock = 1;
7307         task = rpc_run_task(&task_setup_data);
7308         if (IS_ERR(task))
7309                 return PTR_ERR(task);
7310         ret = rpc_wait_for_completion_task(task);
7311         if (ret == 0) {
7312                 ret = data->rpc_status;
7313                 if (ret)
7314                         nfs4_handle_setlk_error(data->server, data->lsp,
7315                                         data->arg.new_lock_owner, ret);
7316         } else
7317                 data->cancelled = true;
7318         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7319         rpc_put_task(task);
7320         dprintk("%s: ret = %d\n", __func__, ret);
7321         return ret;
7322 }
7323
7324 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7325 {
7326         struct nfs_server *server = NFS_SERVER(state->inode);
7327         struct nfs4_exception exception = {
7328                 .inode = state->inode,
7329         };
7330         int err;
7331
7332         do {
7333                 /* Cache the lock if possible... */
7334                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7335                         return 0;
7336                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7337                 if (err != -NFS4ERR_DELAY)
7338                         break;
7339                 nfs4_handle_exception(server, err, &exception);
7340         } while (exception.retry);
7341         return err;
7342 }
7343
7344 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7345 {
7346         struct nfs_server *server = NFS_SERVER(state->inode);
7347         struct nfs4_exception exception = {
7348                 .inode = state->inode,
7349         };
7350         int err;
7351
7352         err = nfs4_set_lock_state(state, request);
7353         if (err != 0)
7354                 return err;
7355         if (!recover_lost_locks) {
7356                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7357                 return 0;
7358         }
7359         do {
7360                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7361                         return 0;
7362                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7363                 switch (err) {
7364                 default:
7365                         goto out;
7366                 case -NFS4ERR_GRACE:
7367                 case -NFS4ERR_DELAY:
7368                         nfs4_handle_exception(server, err, &exception);
7369                         err = 0;
7370                 }
7371         } while (exception.retry);
7372 out:
7373         return err;
7374 }
7375
7376 #if defined(CONFIG_NFS_V4_1)
7377 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7378 {
7379         struct nfs4_lock_state *lsp;
7380         int status;
7381
7382         status = nfs4_set_lock_state(state, request);
7383         if (status != 0)
7384                 return status;
7385         lsp = request->fl_u.nfs4_fl.owner;
7386         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7387             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7388                 return 0;
7389         return nfs4_lock_expired(state, request);
7390 }
7391 #endif
7392
7393 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7394 {
7395         struct nfs_inode *nfsi = NFS_I(state->inode);
7396         struct nfs4_state_owner *sp = state->owner;
7397         unsigned char fl_flags = request->fl_flags;
7398         int status;
7399
7400         request->fl_flags |= FL_ACCESS;
7401         status = locks_lock_inode_wait(state->inode, request);
7402         if (status < 0)
7403                 goto out;
7404         mutex_lock(&sp->so_delegreturn_mutex);
7405         down_read(&nfsi->rwsem);
7406         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7407                 /* Yes: cache locks! */
7408                 /* ...but avoid races with delegation recall... */
7409                 request->fl_flags = fl_flags & ~FL_SLEEP;
7410                 status = locks_lock_inode_wait(state->inode, request);
7411                 up_read(&nfsi->rwsem);
7412                 mutex_unlock(&sp->so_delegreturn_mutex);
7413                 goto out;
7414         }
7415         up_read(&nfsi->rwsem);
7416         mutex_unlock(&sp->so_delegreturn_mutex);
7417         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7418 out:
7419         request->fl_flags = fl_flags;
7420         return status;
7421 }
7422
7423 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7424 {
7425         struct nfs4_exception exception = {
7426                 .state = state,
7427                 .inode = state->inode,
7428                 .interruptible = true,
7429         };
7430         int err;
7431
7432         do {
7433                 err = _nfs4_proc_setlk(state, cmd, request);
7434                 if (err == -NFS4ERR_DENIED)
7435                         err = -EAGAIN;
7436                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7437                                 err, &exception);
7438         } while (exception.retry);
7439         return err;
7440 }
7441
7442 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7443 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7444
7445 static int
7446 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7447                         struct file_lock *request)
7448 {
7449         int             status = -ERESTARTSYS;
7450         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7451
7452         while(!signalled()) {
7453                 status = nfs4_proc_setlk(state, cmd, request);
7454                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7455                         break;
7456                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7457                 schedule_timeout(timeout);
7458                 timeout *= 2;
7459                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7460                 status = -ERESTARTSYS;
7461         }
7462         return status;
7463 }
7464
7465 #ifdef CONFIG_NFS_V4_1
7466 struct nfs4_lock_waiter {
7467         struct inode            *inode;
7468         struct nfs_lowner       owner;
7469         wait_queue_entry_t      wait;
7470 };
7471
7472 static int
7473 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7474 {
7475         struct nfs4_lock_waiter *waiter =
7476                 container_of(wait, struct nfs4_lock_waiter, wait);
7477
7478         /* NULL key means to wake up everyone */
7479         if (key) {
7480                 struct cb_notify_lock_args      *cbnl = key;
7481                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7482                                                 *wowner = &waiter->owner;
7483
7484                 /* Only wake if the callback was for the same owner. */
7485                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7486                         return 0;
7487
7488                 /* Make sure it's for the right inode */
7489                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7490                         return 0;
7491         }
7492
7493         return woken_wake_function(wait, mode, flags, key);
7494 }
7495
7496 static int
7497 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7498 {
7499         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7500         struct nfs_server *server = NFS_SERVER(state->inode);
7501         struct nfs_client *clp = server->nfs_client;
7502         wait_queue_head_t *q = &clp->cl_lock_waitq;
7503         struct nfs4_lock_waiter waiter = {
7504                 .inode = state->inode,
7505                 .owner = { .clientid = clp->cl_clientid,
7506                            .id = lsp->ls_seqid.owner_id,
7507                            .s_dev = server->s_dev },
7508         };
7509         int status;
7510
7511         /* Don't bother with waitqueue if we don't expect a callback */
7512         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7513                 return nfs4_retry_setlk_simple(state, cmd, request);
7514
7515         init_wait(&waiter.wait);
7516         waiter.wait.func = nfs4_wake_lock_waiter;
7517         add_wait_queue(q, &waiter.wait);
7518
7519         do {
7520                 status = nfs4_proc_setlk(state, cmd, request);
7521                 if (status != -EAGAIN || IS_SETLK(cmd))
7522                         break;
7523
7524                 status = -ERESTARTSYS;
7525                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7526                            NFS4_LOCK_MAXTIMEOUT);
7527         } while (!signalled());
7528
7529         remove_wait_queue(q, &waiter.wait);
7530
7531         return status;
7532 }
7533 #else /* !CONFIG_NFS_V4_1 */
7534 static inline int
7535 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7536 {
7537         return nfs4_retry_setlk_simple(state, cmd, request);
7538 }
7539 #endif
7540
7541 static int
7542 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7543 {
7544         struct nfs_open_context *ctx;
7545         struct nfs4_state *state;
7546         int status;
7547
7548         /* verify open state */
7549         ctx = nfs_file_open_context(filp);
7550         state = ctx->state;
7551
7552         if (IS_GETLK(cmd)) {
7553                 if (state != NULL)
7554                         return nfs4_proc_getlk(state, F_GETLK, request);
7555                 return 0;
7556         }
7557
7558         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7559                 return -EINVAL;
7560
7561         if (request->fl_type == F_UNLCK) {
7562                 if (state != NULL)
7563                         return nfs4_proc_unlck(state, cmd, request);
7564                 return 0;
7565         }
7566
7567         if (state == NULL)
7568                 return -ENOLCK;
7569
7570         if ((request->fl_flags & FL_POSIX) &&
7571             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7572                 return -ENOLCK;
7573
7574         /*
7575          * Don't rely on the VFS having checked the file open mode,
7576          * since it won't do this for flock() locks.
7577          */
7578         switch (request->fl_type) {
7579         case F_RDLCK:
7580                 if (!(filp->f_mode & FMODE_READ))
7581                         return -EBADF;
7582                 break;
7583         case F_WRLCK:
7584                 if (!(filp->f_mode & FMODE_WRITE))
7585                         return -EBADF;
7586         }
7587
7588         status = nfs4_set_lock_state(state, request);
7589         if (status != 0)
7590                 return status;
7591
7592         return nfs4_retry_setlk(state, cmd, request);
7593 }
7594
7595 static int nfs4_delete_lease(struct file *file, void **priv)
7596 {
7597         return generic_setlease(file, F_UNLCK, NULL, priv);
7598 }
7599
7600 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease,
7601                           void **priv)
7602 {
7603         struct inode *inode = file_inode(file);
7604         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7605         int ret;
7606
7607         /* No delegation, no lease */
7608         if (!nfs4_have_delegation(inode, type))
7609                 return -EAGAIN;
7610         ret = generic_setlease(file, arg, lease, priv);
7611         if (ret || nfs4_have_delegation(inode, type))
7612                 return ret;
7613         /* We raced with a delegation return */
7614         nfs4_delete_lease(file, priv);
7615         return -EAGAIN;
7616 }
7617
7618 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease,
7619                        void **priv)
7620 {
7621         switch (arg) {
7622         case F_RDLCK:
7623         case F_WRLCK:
7624                 return nfs4_add_lease(file, arg, lease, priv);
7625         case F_UNLCK:
7626                 return nfs4_delete_lease(file, priv);
7627         default:
7628                 return -EINVAL;
7629         }
7630 }
7631
7632 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7633 {
7634         struct nfs_server *server = NFS_SERVER(state->inode);
7635         int err;
7636
7637         err = nfs4_set_lock_state(state, fl);
7638         if (err != 0)
7639                 return err;
7640         do {
7641                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7642                 if (err != -NFS4ERR_DELAY)
7643                         break;
7644                 ssleep(1);
7645         } while (err == -NFS4ERR_DELAY);
7646         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7647 }
7648
7649 struct nfs_release_lockowner_data {
7650         struct nfs4_lock_state *lsp;
7651         struct nfs_server *server;
7652         struct nfs_release_lockowner_args args;
7653         struct nfs_release_lockowner_res res;
7654         unsigned long timestamp;
7655 };
7656
7657 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7658 {
7659         struct nfs_release_lockowner_data *data = calldata;
7660         struct nfs_server *server = data->server;
7661         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7662                            &data->res.seq_res, task);
7663         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7664         data->timestamp = jiffies;
7665 }
7666
7667 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7668 {
7669         struct nfs_release_lockowner_data *data = calldata;
7670         struct nfs_server *server = data->server;
7671
7672         nfs40_sequence_done(task, &data->res.seq_res);
7673
7674         switch (task->tk_status) {
7675         case 0:
7676                 renew_lease(server, data->timestamp);
7677                 break;
7678         case -NFS4ERR_STALE_CLIENTID:
7679         case -NFS4ERR_EXPIRED:
7680                 nfs4_schedule_lease_recovery(server->nfs_client);
7681                 break;
7682         case -NFS4ERR_LEASE_MOVED:
7683         case -NFS4ERR_DELAY:
7684                 if (nfs4_async_handle_error(task, server,
7685                                             NULL, NULL) == -EAGAIN)
7686                         rpc_restart_call_prepare(task);
7687         }
7688 }
7689
7690 static void nfs4_release_lockowner_release(void *calldata)
7691 {
7692         struct nfs_release_lockowner_data *data = calldata;
7693         nfs4_free_lock_state(data->server, data->lsp);
7694         kfree(calldata);
7695 }
7696
7697 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7698         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7699         .rpc_call_done = nfs4_release_lockowner_done,
7700         .rpc_release = nfs4_release_lockowner_release,
7701 };
7702
7703 static void
7704 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7705 {
7706         struct nfs_release_lockowner_data *data;
7707         struct rpc_message msg = {
7708                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7709         };
7710
7711         if (server->nfs_client->cl_mvops->minor_version != 0)
7712                 return;
7713
7714         data = kmalloc(sizeof(*data), GFP_KERNEL);
7715         if (!data)
7716                 return;
7717         data->lsp = lsp;
7718         data->server = server;
7719         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7720         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7721         data->args.lock_owner.s_dev = server->s_dev;
7722
7723         msg.rpc_argp = &data->args;
7724         msg.rpc_resp = &data->res;
7725         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7726         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7727 }
7728
7729 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7730
7731 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7732                                    struct mnt_idmap *idmap,
7733                                    struct dentry *unused, struct inode *inode,
7734                                    const char *key, const void *buf,
7735                                    size_t buflen, int flags)
7736 {
7737         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7738 }
7739
7740 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7741                                    struct dentry *unused, struct inode *inode,
7742                                    const char *key, void *buf, size_t buflen)
7743 {
7744         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7745 }
7746
7747 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7748 {
7749         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7750 }
7751
7752 #if defined(CONFIG_NFS_V4_1)
7753 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7754
7755 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7756                                     struct mnt_idmap *idmap,
7757                                     struct dentry *unused, struct inode *inode,
7758                                     const char *key, const void *buf,
7759                                     size_t buflen, int flags)
7760 {
7761         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7762 }
7763
7764 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7765                                     struct dentry *unused, struct inode *inode,
7766                                     const char *key, void *buf, size_t buflen)
7767 {
7768         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7769 }
7770
7771 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7772 {
7773         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7774 }
7775
7776 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7777
7778 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7779                                     struct mnt_idmap *idmap,
7780                                     struct dentry *unused, struct inode *inode,
7781                                     const char *key, const void *buf,
7782                                     size_t buflen, int flags)
7783 {
7784         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7785 }
7786
7787 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7788                                     struct dentry *unused, struct inode *inode,
7789                                     const char *key, void *buf, size_t buflen)
7790 {
7791         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7792 }
7793
7794 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7795 {
7796         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7797 }
7798
7799 #endif
7800
7801 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7802
7803 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7804                                      struct mnt_idmap *idmap,
7805                                      struct dentry *unused, struct inode *inode,
7806                                      const char *key, const void *buf,
7807                                      size_t buflen, int flags)
7808 {
7809         if (security_ismaclabel(key))
7810                 return nfs4_set_security_label(inode, buf, buflen);
7811
7812         return -EOPNOTSUPP;
7813 }
7814
7815 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7816                                      struct dentry *unused, struct inode *inode,
7817                                      const char *key, void *buf, size_t buflen)
7818 {
7819         if (security_ismaclabel(key))
7820                 return nfs4_get_security_label(inode, buf, buflen);
7821         return -EOPNOTSUPP;
7822 }
7823
7824 static ssize_t
7825 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7826 {
7827         int len = 0;
7828
7829         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7830                 len = security_inode_listsecurity(inode, list, list_len);
7831                 if (len >= 0 && list_len && len > list_len)
7832                         return -ERANGE;
7833         }
7834         return len;
7835 }
7836
7837 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7838         .prefix = XATTR_SECURITY_PREFIX,
7839         .get    = nfs4_xattr_get_nfs4_label,
7840         .set    = nfs4_xattr_set_nfs4_label,
7841 };
7842
7843 #else
7844
7845 static ssize_t
7846 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7847 {
7848         return 0;
7849 }
7850
7851 #endif
7852
7853 #ifdef CONFIG_NFS_V4_2
7854 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7855                                     struct mnt_idmap *idmap,
7856                                     struct dentry *unused, struct inode *inode,
7857                                     const char *key, const void *buf,
7858                                     size_t buflen, int flags)
7859 {
7860         u32 mask;
7861         int ret;
7862
7863         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7864                 return -EOPNOTSUPP;
7865
7866         /*
7867          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7868          * flags right now. Handling of xattr operations use the normal
7869          * file read/write permissions.
7870          *
7871          * Just in case the server has other ideas (which RFC 8276 allows),
7872          * do a cached access check for the XA* flags to possibly avoid
7873          * doing an RPC and getting EACCES back.
7874          */
7875         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7876                 if (!(mask & NFS_ACCESS_XAWRITE))
7877                         return -EACCES;
7878         }
7879
7880         if (buf == NULL) {
7881                 ret = nfs42_proc_removexattr(inode, key);
7882                 if (!ret)
7883                         nfs4_xattr_cache_remove(inode, key);
7884         } else {
7885                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7886                 if (!ret)
7887                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7888         }
7889
7890         return ret;
7891 }
7892
7893 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7894                                     struct dentry *unused, struct inode *inode,
7895                                     const char *key, void *buf, size_t buflen)
7896 {
7897         u32 mask;
7898         ssize_t ret;
7899
7900         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7901                 return -EOPNOTSUPP;
7902
7903         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7904                 if (!(mask & NFS_ACCESS_XAREAD))
7905                         return -EACCES;
7906         }
7907
7908         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7909         if (ret)
7910                 return ret;
7911
7912         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7913         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7914                 return ret;
7915
7916         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7917
7918         return ret;
7919 }
7920
7921 static ssize_t
7922 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7923 {
7924         u64 cookie;
7925         bool eof;
7926         ssize_t ret, size;
7927         char *buf;
7928         size_t buflen;
7929         u32 mask;
7930
7931         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7932                 return 0;
7933
7934         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7935                 if (!(mask & NFS_ACCESS_XALIST))
7936                         return 0;
7937         }
7938
7939         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7940         if (ret)
7941                 return ret;
7942
7943         ret = nfs4_xattr_cache_list(inode, list, list_len);
7944         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7945                 return ret;
7946
7947         cookie = 0;
7948         eof = false;
7949         buflen = list_len ? list_len : XATTR_LIST_MAX;
7950         buf = list_len ? list : NULL;
7951         size = 0;
7952
7953         while (!eof) {
7954                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7955                     &cookie, &eof);
7956                 if (ret < 0)
7957                         return ret;
7958
7959                 if (list_len) {
7960                         buf += ret;
7961                         buflen -= ret;
7962                 }
7963                 size += ret;
7964         }
7965
7966         if (list_len)
7967                 nfs4_xattr_cache_set_list(inode, list, size);
7968
7969         return size;
7970 }
7971
7972 #else
7973
7974 static ssize_t
7975 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7976 {
7977         return 0;
7978 }
7979 #endif /* CONFIG_NFS_V4_2 */
7980
7981 /*
7982  * nfs_fhget will use either the mounted_on_fileid or the fileid
7983  */
7984 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7985 {
7986         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7987                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7988               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7989               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7990                 return;
7991
7992         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7993                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7994         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7995         fattr->nlink = 2;
7996 }
7997
7998 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7999                                    const struct qstr *name,
8000                                    struct nfs4_fs_locations *fs_locations,
8001                                    struct page *page)
8002 {
8003         struct nfs_server *server = NFS_SERVER(dir);
8004         u32 bitmask[3];
8005         struct nfs4_fs_locations_arg args = {
8006                 .dir_fh = NFS_FH(dir),
8007                 .name = name,
8008                 .page = page,
8009                 .bitmask = bitmask,
8010         };
8011         struct nfs4_fs_locations_res res = {
8012                 .fs_locations = fs_locations,
8013         };
8014         struct rpc_message msg = {
8015                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8016                 .rpc_argp = &args,
8017                 .rpc_resp = &res,
8018         };
8019         int status;
8020
8021         dprintk("%s: start\n", __func__);
8022
8023         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8024         bitmask[1] = nfs4_fattr_bitmap[1];
8025
8026         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8027          * is not supported */
8028         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8029                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8030         else
8031                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8032
8033         nfs_fattr_init(fs_locations->fattr);
8034         fs_locations->server = server;
8035         fs_locations->nlocations = 0;
8036         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8037         dprintk("%s: returned status = %d\n", __func__, status);
8038         return status;
8039 }
8040
8041 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8042                            const struct qstr *name,
8043                            struct nfs4_fs_locations *fs_locations,
8044                            struct page *page)
8045 {
8046         struct nfs4_exception exception = {
8047                 .interruptible = true,
8048         };
8049         int err;
8050         do {
8051                 err = _nfs4_proc_fs_locations(client, dir, name,
8052                                 fs_locations, page);
8053                 trace_nfs4_get_fs_locations(dir, name, err);
8054                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8055                                 &exception);
8056         } while (exception.retry);
8057         return err;
8058 }
8059
8060 /*
8061  * This operation also signals the server that this client is
8062  * performing migration recovery.  The server can stop returning
8063  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8064  * appended to this compound to identify the client ID which is
8065  * performing recovery.
8066  */
8067 static int _nfs40_proc_get_locations(struct nfs_server *server,
8068                                      struct nfs_fh *fhandle,
8069                                      struct nfs4_fs_locations *locations,
8070                                      struct page *page, const struct cred *cred)
8071 {
8072         struct rpc_clnt *clnt = server->client;
8073         u32 bitmask[2] = {
8074                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8075         };
8076         struct nfs4_fs_locations_arg args = {
8077                 .clientid       = server->nfs_client->cl_clientid,
8078                 .fh             = fhandle,
8079                 .page           = page,
8080                 .bitmask        = bitmask,
8081                 .migration      = 1,            /* skip LOOKUP */
8082                 .renew          = 1,            /* append RENEW */
8083         };
8084         struct nfs4_fs_locations_res res = {
8085                 .fs_locations   = locations,
8086                 .migration      = 1,
8087                 .renew          = 1,
8088         };
8089         struct rpc_message msg = {
8090                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8091                 .rpc_argp       = &args,
8092                 .rpc_resp       = &res,
8093                 .rpc_cred       = cred,
8094         };
8095         unsigned long now = jiffies;
8096         int status;
8097
8098         nfs_fattr_init(locations->fattr);
8099         locations->server = server;
8100         locations->nlocations = 0;
8101
8102         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8103         status = nfs4_call_sync_sequence(clnt, server, &msg,
8104                                         &args.seq_args, &res.seq_res);
8105         if (status)
8106                 return status;
8107
8108         renew_lease(server, now);
8109         return 0;
8110 }
8111
8112 #ifdef CONFIG_NFS_V4_1
8113
8114 /*
8115  * This operation also signals the server that this client is
8116  * performing migration recovery.  The server can stop asserting
8117  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8118  * performing this operation is identified in the SEQUENCE
8119  * operation in this compound.
8120  *
8121  * When the client supports GETATTR(fs_locations_info), it can
8122  * be plumbed in here.
8123  */
8124 static int _nfs41_proc_get_locations(struct nfs_server *server,
8125                                      struct nfs_fh *fhandle,
8126                                      struct nfs4_fs_locations *locations,
8127                                      struct page *page, const struct cred *cred)
8128 {
8129         struct rpc_clnt *clnt = server->client;
8130         u32 bitmask[2] = {
8131                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8132         };
8133         struct nfs4_fs_locations_arg args = {
8134                 .fh             = fhandle,
8135                 .page           = page,
8136                 .bitmask        = bitmask,
8137                 .migration      = 1,            /* skip LOOKUP */
8138         };
8139         struct nfs4_fs_locations_res res = {
8140                 .fs_locations   = locations,
8141                 .migration      = 1,
8142         };
8143         struct rpc_message msg = {
8144                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8145                 .rpc_argp       = &args,
8146                 .rpc_resp       = &res,
8147                 .rpc_cred       = cred,
8148         };
8149         struct nfs4_call_sync_data data = {
8150                 .seq_server = server,
8151                 .seq_args = &args.seq_args,
8152                 .seq_res = &res.seq_res,
8153         };
8154         struct rpc_task_setup task_setup_data = {
8155                 .rpc_client = clnt,
8156                 .rpc_message = &msg,
8157                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8158                 .callback_data = &data,
8159                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8160         };
8161         int status;
8162
8163         nfs_fattr_init(locations->fattr);
8164         locations->server = server;
8165         locations->nlocations = 0;
8166
8167         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8168         status = nfs4_call_sync_custom(&task_setup_data);
8169         if (status == NFS4_OK &&
8170             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8171                 status = -NFS4ERR_LEASE_MOVED;
8172         return status;
8173 }
8174
8175 #endif  /* CONFIG_NFS_V4_1 */
8176
8177 /**
8178  * nfs4_proc_get_locations - discover locations for a migrated FSID
8179  * @server: pointer to nfs_server to process
8180  * @fhandle: pointer to the kernel NFS client file handle
8181  * @locations: result of query
8182  * @page: buffer
8183  * @cred: credential to use for this operation
8184  *
8185  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8186  * operation failed, or a negative errno if a local error occurred.
8187  *
8188  * On success, "locations" is filled in, but if the server has
8189  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8190  * asserted.
8191  *
8192  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8193  * from this client that require migration recovery.
8194  */
8195 int nfs4_proc_get_locations(struct nfs_server *server,
8196                             struct nfs_fh *fhandle,
8197                             struct nfs4_fs_locations *locations,
8198                             struct page *page, const struct cred *cred)
8199 {
8200         struct nfs_client *clp = server->nfs_client;
8201         const struct nfs4_mig_recovery_ops *ops =
8202                                         clp->cl_mvops->mig_recovery_ops;
8203         struct nfs4_exception exception = {
8204                 .interruptible = true,
8205         };
8206         int status;
8207
8208         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8209                 (unsigned long long)server->fsid.major,
8210                 (unsigned long long)server->fsid.minor,
8211                 clp->cl_hostname);
8212         nfs_display_fhandle(fhandle, __func__);
8213
8214         do {
8215                 status = ops->get_locations(server, fhandle, locations, page,
8216                                             cred);
8217                 if (status != -NFS4ERR_DELAY)
8218                         break;
8219                 nfs4_handle_exception(server, status, &exception);
8220         } while (exception.retry);
8221         return status;
8222 }
8223
8224 /*
8225  * This operation also signals the server that this client is
8226  * performing "lease moved" recovery.  The server can stop
8227  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8228  * is appended to this compound to identify the client ID which is
8229  * performing recovery.
8230  */
8231 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8232 {
8233         struct nfs_server *server = NFS_SERVER(inode);
8234         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8235         struct rpc_clnt *clnt = server->client;
8236         struct nfs4_fsid_present_arg args = {
8237                 .fh             = NFS_FH(inode),
8238                 .clientid       = clp->cl_clientid,
8239                 .renew          = 1,            /* append RENEW */
8240         };
8241         struct nfs4_fsid_present_res res = {
8242                 .renew          = 1,
8243         };
8244         struct rpc_message msg = {
8245                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8246                 .rpc_argp       = &args,
8247                 .rpc_resp       = &res,
8248                 .rpc_cred       = cred,
8249         };
8250         unsigned long now = jiffies;
8251         int status;
8252
8253         res.fh = nfs_alloc_fhandle();
8254         if (res.fh == NULL)
8255                 return -ENOMEM;
8256
8257         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8258         status = nfs4_call_sync_sequence(clnt, server, &msg,
8259                                                 &args.seq_args, &res.seq_res);
8260         nfs_free_fhandle(res.fh);
8261         if (status)
8262                 return status;
8263
8264         do_renew_lease(clp, now);
8265         return 0;
8266 }
8267
8268 #ifdef CONFIG_NFS_V4_1
8269
8270 /*
8271  * This operation also signals the server that this client is
8272  * performing "lease moved" recovery.  The server can stop asserting
8273  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8274  * this operation is identified in the SEQUENCE operation in this
8275  * compound.
8276  */
8277 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8278 {
8279         struct nfs_server *server = NFS_SERVER(inode);
8280         struct rpc_clnt *clnt = server->client;
8281         struct nfs4_fsid_present_arg args = {
8282                 .fh             = NFS_FH(inode),
8283         };
8284         struct nfs4_fsid_present_res res = {
8285         };
8286         struct rpc_message msg = {
8287                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8288                 .rpc_argp       = &args,
8289                 .rpc_resp       = &res,
8290                 .rpc_cred       = cred,
8291         };
8292         int status;
8293
8294         res.fh = nfs_alloc_fhandle();
8295         if (res.fh == NULL)
8296                 return -ENOMEM;
8297
8298         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8299         status = nfs4_call_sync_sequence(clnt, server, &msg,
8300                                                 &args.seq_args, &res.seq_res);
8301         nfs_free_fhandle(res.fh);
8302         if (status == NFS4_OK &&
8303             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8304                 status = -NFS4ERR_LEASE_MOVED;
8305         return status;
8306 }
8307
8308 #endif  /* CONFIG_NFS_V4_1 */
8309
8310 /**
8311  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8312  * @inode: inode on FSID to check
8313  * @cred: credential to use for this operation
8314  *
8315  * Server indicates whether the FSID is present, moved, or not
8316  * recognized.  This operation is necessary to clear a LEASE_MOVED
8317  * condition for this client ID.
8318  *
8319  * Returns NFS4_OK if the FSID is present on this server,
8320  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8321  *  NFS4ERR code if some error occurred on the server, or a
8322  *  negative errno if a local failure occurred.
8323  */
8324 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8325 {
8326         struct nfs_server *server = NFS_SERVER(inode);
8327         struct nfs_client *clp = server->nfs_client;
8328         const struct nfs4_mig_recovery_ops *ops =
8329                                         clp->cl_mvops->mig_recovery_ops;
8330         struct nfs4_exception exception = {
8331                 .interruptible = true,
8332         };
8333         int status;
8334
8335         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8336                 (unsigned long long)server->fsid.major,
8337                 (unsigned long long)server->fsid.minor,
8338                 clp->cl_hostname);
8339         nfs_display_fhandle(NFS_FH(inode), __func__);
8340
8341         do {
8342                 status = ops->fsid_present(inode, cred);
8343                 if (status != -NFS4ERR_DELAY)
8344                         break;
8345                 nfs4_handle_exception(server, status, &exception);
8346         } while (exception.retry);
8347         return status;
8348 }
8349
8350 /*
8351  * If 'use_integrity' is true and the state managment nfs_client
8352  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8353  * and the machine credential as per RFC3530bis and RFC5661 Security
8354  * Considerations sections. Otherwise, just use the user cred with the
8355  * filesystem's rpc_client.
8356  */
8357 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8358 {
8359         int status;
8360         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8361         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8362         struct nfs4_secinfo_arg args = {
8363                 .dir_fh = NFS_FH(dir),
8364                 .name   = name,
8365         };
8366         struct nfs4_secinfo_res res = {
8367                 .flavors     = flavors,
8368         };
8369         struct rpc_message msg = {
8370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8371                 .rpc_argp = &args,
8372                 .rpc_resp = &res,
8373         };
8374         struct nfs4_call_sync_data data = {
8375                 .seq_server = NFS_SERVER(dir),
8376                 .seq_args = &args.seq_args,
8377                 .seq_res = &res.seq_res,
8378         };
8379         struct rpc_task_setup task_setup = {
8380                 .rpc_client = clnt,
8381                 .rpc_message = &msg,
8382                 .callback_ops = clp->cl_mvops->call_sync_ops,
8383                 .callback_data = &data,
8384                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8385         };
8386         const struct cred *cred = NULL;
8387
8388         if (use_integrity) {
8389                 clnt = clp->cl_rpcclient;
8390                 task_setup.rpc_client = clnt;
8391
8392                 cred = nfs4_get_clid_cred(clp);
8393                 msg.rpc_cred = cred;
8394         }
8395
8396         dprintk("NFS call  secinfo %s\n", name->name);
8397
8398         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8399         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8400         status = nfs4_call_sync_custom(&task_setup);
8401
8402         dprintk("NFS reply  secinfo: %d\n", status);
8403
8404         put_cred(cred);
8405         return status;
8406 }
8407
8408 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8409                       struct nfs4_secinfo_flavors *flavors)
8410 {
8411         struct nfs4_exception exception = {
8412                 .interruptible = true,
8413         };
8414         int err;
8415         do {
8416                 err = -NFS4ERR_WRONGSEC;
8417
8418                 /* try to use integrity protection with machine cred */
8419                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8420                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8421
8422                 /*
8423                  * if unable to use integrity protection, or SECINFO with
8424                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8425                  * disallowed by spec, but exists in deployed servers) use
8426                  * the current filesystem's rpc_client and the user cred.
8427                  */
8428                 if (err == -NFS4ERR_WRONGSEC)
8429                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8430
8431                 trace_nfs4_secinfo(dir, name, err);
8432                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8433                                 &exception);
8434         } while (exception.retry);
8435         return err;
8436 }
8437
8438 #ifdef CONFIG_NFS_V4_1
8439 /*
8440  * Check the exchange flags returned by the server for invalid flags, having
8441  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8442  * DS flags set.
8443  */
8444 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8445 {
8446         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8447                 goto out_inval;
8448         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8449                 goto out_inval;
8450         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8451             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8452                 goto out_inval;
8453         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8454                 goto out_inval;
8455         return NFS_OK;
8456 out_inval:
8457         return -NFS4ERR_INVAL;
8458 }
8459
8460 static bool
8461 nfs41_same_server_scope(struct nfs41_server_scope *a,
8462                         struct nfs41_server_scope *b)
8463 {
8464         if (a->server_scope_sz != b->server_scope_sz)
8465                 return false;
8466         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8467 }
8468
8469 static void
8470 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8471 {
8472         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8473         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8474         struct nfs_client *clp = args->client;
8475
8476         switch (task->tk_status) {
8477         case -NFS4ERR_BADSESSION:
8478         case -NFS4ERR_DEADSESSION:
8479                 nfs4_schedule_session_recovery(clp->cl_session,
8480                                 task->tk_status);
8481                 return;
8482         }
8483         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8484                         res->dir != NFS4_CDFS4_BOTH) {
8485                 rpc_task_close_connection(task);
8486                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8487                         rpc_restart_call(task);
8488         }
8489 }
8490
8491 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8492         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8493 };
8494
8495 /*
8496  * nfs4_proc_bind_one_conn_to_session()
8497  *
8498  * The 4.1 client currently uses the same TCP connection for the
8499  * fore and backchannel.
8500  */
8501 static
8502 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8503                 struct rpc_xprt *xprt,
8504                 struct nfs_client *clp,
8505                 const struct cred *cred)
8506 {
8507         int status;
8508         struct nfs41_bind_conn_to_session_args args = {
8509                 .client = clp,
8510                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8511                 .retries = 0,
8512         };
8513         struct nfs41_bind_conn_to_session_res res;
8514         struct rpc_message msg = {
8515                 .rpc_proc =
8516                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8517                 .rpc_argp = &args,
8518                 .rpc_resp = &res,
8519                 .rpc_cred = cred,
8520         };
8521         struct rpc_task_setup task_setup_data = {
8522                 .rpc_client = clnt,
8523                 .rpc_xprt = xprt,
8524                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8525                 .rpc_message = &msg,
8526                 .flags = RPC_TASK_TIMEOUT,
8527         };
8528         struct rpc_task *task;
8529
8530         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8531         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8532                 args.dir = NFS4_CDFC4_FORE;
8533
8534         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8535         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8536                 args.dir = NFS4_CDFC4_FORE;
8537
8538         task = rpc_run_task(&task_setup_data);
8539         if (!IS_ERR(task)) {
8540                 status = task->tk_status;
8541                 rpc_put_task(task);
8542         } else
8543                 status = PTR_ERR(task);
8544         trace_nfs4_bind_conn_to_session(clp, status);
8545         if (status == 0) {
8546                 if (memcmp(res.sessionid.data,
8547                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8548                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8549                         return -EIO;
8550                 }
8551                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8552                         dprintk("NFS: %s: Unexpected direction from server\n",
8553                                 __func__);
8554                         return -EIO;
8555                 }
8556                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8557                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8558                                 __func__);
8559                         return -EIO;
8560                 }
8561         }
8562
8563         return status;
8564 }
8565
8566 struct rpc_bind_conn_calldata {
8567         struct nfs_client *clp;
8568         const struct cred *cred;
8569 };
8570
8571 static int
8572 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8573                 struct rpc_xprt *xprt,
8574                 void *calldata)
8575 {
8576         struct rpc_bind_conn_calldata *p = calldata;
8577
8578         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8579 }
8580
8581 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8582 {
8583         struct rpc_bind_conn_calldata data = {
8584                 .clp = clp,
8585                 .cred = cred,
8586         };
8587         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8588                         nfs4_proc_bind_conn_to_session_callback, &data);
8589 }
8590
8591 /*
8592  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8593  * and operations we'd like to see to enable certain features in the allow map
8594  */
8595 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8596         .how = SP4_MACH_CRED,
8597         .enforce.u.words = {
8598                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8599                       1 << (OP_EXCHANGE_ID - 32) |
8600                       1 << (OP_CREATE_SESSION - 32) |
8601                       1 << (OP_DESTROY_SESSION - 32) |
8602                       1 << (OP_DESTROY_CLIENTID - 32)
8603         },
8604         .allow.u.words = {
8605                 [0] = 1 << (OP_CLOSE) |
8606                       1 << (OP_OPEN_DOWNGRADE) |
8607                       1 << (OP_LOCKU) |
8608                       1 << (OP_DELEGRETURN) |
8609                       1 << (OP_COMMIT),
8610                 [1] = 1 << (OP_SECINFO - 32) |
8611                       1 << (OP_SECINFO_NO_NAME - 32) |
8612                       1 << (OP_LAYOUTRETURN - 32) |
8613                       1 << (OP_TEST_STATEID - 32) |
8614                       1 << (OP_FREE_STATEID - 32) |
8615                       1 << (OP_WRITE - 32)
8616         }
8617 };
8618
8619 /*
8620  * Select the state protection mode for client `clp' given the server results
8621  * from exchange_id in `sp'.
8622  *
8623  * Returns 0 on success, negative errno otherwise.
8624  */
8625 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8626                                  struct nfs41_state_protection *sp)
8627 {
8628         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8629                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8630                       1 << (OP_EXCHANGE_ID - 32) |
8631                       1 << (OP_CREATE_SESSION - 32) |
8632                       1 << (OP_DESTROY_SESSION - 32) |
8633                       1 << (OP_DESTROY_CLIENTID - 32)
8634         };
8635         unsigned long flags = 0;
8636         unsigned int i;
8637         int ret = 0;
8638
8639         if (sp->how == SP4_MACH_CRED) {
8640                 /* Print state protect result */
8641                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8642                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8643                         if (test_bit(i, sp->enforce.u.longs))
8644                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8645                         if (test_bit(i, sp->allow.u.longs))
8646                                 dfprintk(MOUNT, "  allow op %d\n", i);
8647                 }
8648
8649                 /* make sure nothing is on enforce list that isn't supported */
8650                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8651                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8652                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8653                                 ret = -EINVAL;
8654                                 goto out;
8655                         }
8656                 }
8657
8658                 /*
8659                  * Minimal mode - state operations are allowed to use machine
8660                  * credential.  Note this already happens by default, so the
8661                  * client doesn't have to do anything more than the negotiation.
8662                  *
8663                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8664                  *       we're already using the machine cred for exchange_id
8665                  *       and will never use a different cred.
8666                  */
8667                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8668                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8669                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8670                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8671                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8672                         dfprintk(MOUNT, "  minimal mode enabled\n");
8673                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8674                 } else {
8675                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8676                         ret = -EINVAL;
8677                         goto out;
8678                 }
8679
8680                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8681                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8682                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8683                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8684                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8685                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8686                 }
8687
8688                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8689                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8690                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8691                 }
8692
8693                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8694                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8695                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8696                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8697                 }
8698
8699                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8700                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8701                         dfprintk(MOUNT, "  stateid mode enabled\n");
8702                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8703                 }
8704
8705                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8706                         dfprintk(MOUNT, "  write mode enabled\n");
8707                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8708                 }
8709
8710                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8711                         dfprintk(MOUNT, "  commit mode enabled\n");
8712                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8713                 }
8714         }
8715 out:
8716         clp->cl_sp4_flags = flags;
8717         return ret;
8718 }
8719
8720 struct nfs41_exchange_id_data {
8721         struct nfs41_exchange_id_res res;
8722         struct nfs41_exchange_id_args args;
8723 };
8724
8725 static void nfs4_exchange_id_release(void *data)
8726 {
8727         struct nfs41_exchange_id_data *cdata =
8728                                         (struct nfs41_exchange_id_data *)data;
8729
8730         nfs_put_client(cdata->args.client);
8731         kfree(cdata->res.impl_id);
8732         kfree(cdata->res.server_scope);
8733         kfree(cdata->res.server_owner);
8734         kfree(cdata);
8735 }
8736
8737 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8738         .rpc_release = nfs4_exchange_id_release,
8739 };
8740
8741 /*
8742  * _nfs4_proc_exchange_id()
8743  *
8744  * Wrapper for EXCHANGE_ID operation.
8745  */
8746 static struct rpc_task *
8747 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8748                         u32 sp4_how, struct rpc_xprt *xprt)
8749 {
8750         struct rpc_message msg = {
8751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8752                 .rpc_cred = cred,
8753         };
8754         struct rpc_task_setup task_setup_data = {
8755                 .rpc_client = clp->cl_rpcclient,
8756                 .callback_ops = &nfs4_exchange_id_call_ops,
8757                 .rpc_message = &msg,
8758                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8759         };
8760         struct nfs41_exchange_id_data *calldata;
8761         int status;
8762
8763         if (!refcount_inc_not_zero(&clp->cl_count))
8764                 return ERR_PTR(-EIO);
8765
8766         status = -ENOMEM;
8767         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8768         if (!calldata)
8769                 goto out;
8770
8771         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8772
8773         status = nfs4_init_uniform_client_string(clp);
8774         if (status)
8775                 goto out_calldata;
8776
8777         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8778                                                 GFP_NOFS);
8779         status = -ENOMEM;
8780         if (unlikely(calldata->res.server_owner == NULL))
8781                 goto out_calldata;
8782
8783         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8784                                         GFP_NOFS);
8785         if (unlikely(calldata->res.server_scope == NULL))
8786                 goto out_server_owner;
8787
8788         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8789         if (unlikely(calldata->res.impl_id == NULL))
8790                 goto out_server_scope;
8791
8792         switch (sp4_how) {
8793         case SP4_NONE:
8794                 calldata->args.state_protect.how = SP4_NONE;
8795                 break;
8796
8797         case SP4_MACH_CRED:
8798                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8799                 break;
8800
8801         default:
8802                 /* unsupported! */
8803                 WARN_ON_ONCE(1);
8804                 status = -EINVAL;
8805                 goto out_impl_id;
8806         }
8807         if (xprt) {
8808                 task_setup_data.rpc_xprt = xprt;
8809                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8810                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8811                                 sizeof(calldata->args.verifier.data));
8812         }
8813         calldata->args.client = clp;
8814         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8815         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8816 #ifdef CONFIG_NFS_V4_1_MIGRATION
8817         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8818 #endif
8819         if (test_bit(NFS_CS_DS, &clp->cl_flags))
8820                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8821         msg.rpc_argp = &calldata->args;
8822         msg.rpc_resp = &calldata->res;
8823         task_setup_data.callback_data = calldata;
8824
8825         return rpc_run_task(&task_setup_data);
8826
8827 out_impl_id:
8828         kfree(calldata->res.impl_id);
8829 out_server_scope:
8830         kfree(calldata->res.server_scope);
8831 out_server_owner:
8832         kfree(calldata->res.server_owner);
8833 out_calldata:
8834         kfree(calldata);
8835 out:
8836         nfs_put_client(clp);
8837         return ERR_PTR(status);
8838 }
8839
8840 /*
8841  * _nfs4_proc_exchange_id()
8842  *
8843  * Wrapper for EXCHANGE_ID operation.
8844  */
8845 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8846                         u32 sp4_how)
8847 {
8848         struct rpc_task *task;
8849         struct nfs41_exchange_id_args *argp;
8850         struct nfs41_exchange_id_res *resp;
8851         unsigned long now = jiffies;
8852         int status;
8853
8854         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8855         if (IS_ERR(task))
8856                 return PTR_ERR(task);
8857
8858         argp = task->tk_msg.rpc_argp;
8859         resp = task->tk_msg.rpc_resp;
8860         status = task->tk_status;
8861         if (status  != 0)
8862                 goto out;
8863
8864         status = nfs4_check_cl_exchange_flags(resp->flags,
8865                         clp->cl_mvops->minor_version);
8866         if (status  != 0)
8867                 goto out;
8868
8869         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8870         if (status != 0)
8871                 goto out;
8872
8873         do_renew_lease(clp, now);
8874
8875         clp->cl_clientid = resp->clientid;
8876         clp->cl_exchange_flags = resp->flags;
8877         clp->cl_seqid = resp->seqid;
8878         /* Client ID is not confirmed */
8879         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8880                 clear_bit(NFS4_SESSION_ESTABLISHED,
8881                           &clp->cl_session->session_state);
8882
8883         if (clp->cl_serverscope != NULL &&
8884             !nfs41_same_server_scope(clp->cl_serverscope,
8885                                 resp->server_scope)) {
8886                 dprintk("%s: server_scope mismatch detected\n",
8887                         __func__);
8888                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8889         }
8890
8891         swap(clp->cl_serverowner, resp->server_owner);
8892         swap(clp->cl_serverscope, resp->server_scope);
8893         swap(clp->cl_implid, resp->impl_id);
8894
8895         /* Save the EXCHANGE_ID verifier session trunk tests */
8896         memcpy(clp->cl_confirm.data, argp->verifier.data,
8897                sizeof(clp->cl_confirm.data));
8898 out:
8899         trace_nfs4_exchange_id(clp, status);
8900         rpc_put_task(task);
8901         return status;
8902 }
8903
8904 /*
8905  * nfs4_proc_exchange_id()
8906  *
8907  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8908  *
8909  * Since the clientid has expired, all compounds using sessions
8910  * associated with the stale clientid will be returning
8911  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8912  * be in some phase of session reset.
8913  *
8914  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8915  */
8916 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8917 {
8918         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8919         int status;
8920
8921         /* try SP4_MACH_CRED if krb5i/p */
8922         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8923             authflavor == RPC_AUTH_GSS_KRB5P) {
8924                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8925                 if (!status)
8926                         return 0;
8927         }
8928
8929         /* try SP4_NONE */
8930         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8931 }
8932
8933 /**
8934  * nfs4_test_session_trunk
8935  *
8936  * This is an add_xprt_test() test function called from
8937  * rpc_clnt_setup_test_and_add_xprt.
8938  *
8939  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8940  * and is dereferrenced in nfs4_exchange_id_release
8941  *
8942  * Upon success, add the new transport to the rpc_clnt
8943  *
8944  * @clnt: struct rpc_clnt to get new transport
8945  * @xprt: the rpc_xprt to test
8946  * @data: call data for _nfs4_proc_exchange_id.
8947  */
8948 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8949                             void *data)
8950 {
8951         struct nfs4_add_xprt_data *adata = data;
8952         struct rpc_task *task;
8953         int status;
8954
8955         u32 sp4_how;
8956
8957         dprintk("--> %s try %s\n", __func__,
8958                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8959
8960         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8961
8962         /* Test connection for session trunking. Async exchange_id call */
8963         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8964         if (IS_ERR(task))
8965                 return;
8966
8967         status = task->tk_status;
8968         if (status == 0)
8969                 status = nfs4_detect_session_trunking(adata->clp,
8970                                 task->tk_msg.rpc_resp, xprt);
8971
8972         if (status == 0)
8973                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8974         else if (rpc_clnt_xprt_switch_has_addr(clnt,
8975                                 (struct sockaddr *)&xprt->addr))
8976                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8977
8978         rpc_put_task(task);
8979 }
8980 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8981
8982 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8983                 const struct cred *cred)
8984 {
8985         struct rpc_message msg = {
8986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8987                 .rpc_argp = clp,
8988                 .rpc_cred = cred,
8989         };
8990         int status;
8991
8992         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8993                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8994         trace_nfs4_destroy_clientid(clp, status);
8995         if (status)
8996                 dprintk("NFS: Got error %d from the server %s on "
8997                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8998         return status;
8999 }
9000
9001 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9002                 const struct cred *cred)
9003 {
9004         unsigned int loop;
9005         int ret;
9006
9007         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9008                 ret = _nfs4_proc_destroy_clientid(clp, cred);
9009                 switch (ret) {
9010                 case -NFS4ERR_DELAY:
9011                 case -NFS4ERR_CLIENTID_BUSY:
9012                         ssleep(1);
9013                         break;
9014                 default:
9015                         return ret;
9016                 }
9017         }
9018         return 0;
9019 }
9020
9021 int nfs4_destroy_clientid(struct nfs_client *clp)
9022 {
9023         const struct cred *cred;
9024         int ret = 0;
9025
9026         if (clp->cl_mvops->minor_version < 1)
9027                 goto out;
9028         if (clp->cl_exchange_flags == 0)
9029                 goto out;
9030         if (clp->cl_preserve_clid)
9031                 goto out;
9032         cred = nfs4_get_clid_cred(clp);
9033         ret = nfs4_proc_destroy_clientid(clp, cred);
9034         put_cred(cred);
9035         switch (ret) {
9036         case 0:
9037         case -NFS4ERR_STALE_CLIENTID:
9038                 clp->cl_exchange_flags = 0;
9039         }
9040 out:
9041         return ret;
9042 }
9043
9044 #endif /* CONFIG_NFS_V4_1 */
9045
9046 struct nfs4_get_lease_time_data {
9047         struct nfs4_get_lease_time_args *args;
9048         struct nfs4_get_lease_time_res *res;
9049         struct nfs_client *clp;
9050 };
9051
9052 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9053                                         void *calldata)
9054 {
9055         struct nfs4_get_lease_time_data *data =
9056                         (struct nfs4_get_lease_time_data *)calldata;
9057
9058         /* just setup sequence, do not trigger session recovery
9059            since we're invoked within one */
9060         nfs4_setup_sequence(data->clp,
9061                         &data->args->la_seq_args,
9062                         &data->res->lr_seq_res,
9063                         task);
9064 }
9065
9066 /*
9067  * Called from nfs4_state_manager thread for session setup, so don't recover
9068  * from sequence operation or clientid errors.
9069  */
9070 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9071 {
9072         struct nfs4_get_lease_time_data *data =
9073                         (struct nfs4_get_lease_time_data *)calldata;
9074
9075         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9076                 return;
9077         switch (task->tk_status) {
9078         case -NFS4ERR_DELAY:
9079         case -NFS4ERR_GRACE:
9080                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9081                 task->tk_status = 0;
9082                 fallthrough;
9083         case -NFS4ERR_RETRY_UNCACHED_REP:
9084                 rpc_restart_call_prepare(task);
9085                 return;
9086         }
9087 }
9088
9089 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9090         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9091         .rpc_call_done = nfs4_get_lease_time_done,
9092 };
9093
9094 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9095 {
9096         struct nfs4_get_lease_time_args args;
9097         struct nfs4_get_lease_time_res res = {
9098                 .lr_fsinfo = fsinfo,
9099         };
9100         struct nfs4_get_lease_time_data data = {
9101                 .args = &args,
9102                 .res = &res,
9103                 .clp = clp,
9104         };
9105         struct rpc_message msg = {
9106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9107                 .rpc_argp = &args,
9108                 .rpc_resp = &res,
9109         };
9110         struct rpc_task_setup task_setup = {
9111                 .rpc_client = clp->cl_rpcclient,
9112                 .rpc_message = &msg,
9113                 .callback_ops = &nfs4_get_lease_time_ops,
9114                 .callback_data = &data,
9115                 .flags = RPC_TASK_TIMEOUT,
9116         };
9117
9118         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9119         return nfs4_call_sync_custom(&task_setup);
9120 }
9121
9122 #ifdef CONFIG_NFS_V4_1
9123
9124 /*
9125  * Initialize the values to be used by the client in CREATE_SESSION
9126  * If nfs4_init_session set the fore channel request and response sizes,
9127  * use them.
9128  *
9129  * Set the back channel max_resp_sz_cached to zero to force the client to
9130  * always set csa_cachethis to FALSE because the current implementation
9131  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9132  */
9133 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9134                                     struct rpc_clnt *clnt)
9135 {
9136         unsigned int max_rqst_sz, max_resp_sz;
9137         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9138         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9139
9140         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9141         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9142
9143         /* Fore channel attributes */
9144         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9145         args->fc_attrs.max_resp_sz = max_resp_sz;
9146         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9147         args->fc_attrs.max_reqs = max_session_slots;
9148
9149         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9150                 "max_ops=%u max_reqs=%u\n",
9151                 __func__,
9152                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9153                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9154
9155         /* Back channel attributes */
9156         args->bc_attrs.max_rqst_sz = max_bc_payload;
9157         args->bc_attrs.max_resp_sz = max_bc_payload;
9158         args->bc_attrs.max_resp_sz_cached = 0;
9159         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9160         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9161         if (args->bc_attrs.max_reqs > max_bc_slots)
9162                 args->bc_attrs.max_reqs = max_bc_slots;
9163
9164         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9165                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9166                 __func__,
9167                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9168                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9169                 args->bc_attrs.max_reqs);
9170 }
9171
9172 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9173                 struct nfs41_create_session_res *res)
9174 {
9175         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9176         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9177
9178         if (rcvd->max_resp_sz > sent->max_resp_sz)
9179                 return -EINVAL;
9180         /*
9181          * Our requested max_ops is the minimum we need; we're not
9182          * prepared to break up compounds into smaller pieces than that.
9183          * So, no point even trying to continue if the server won't
9184          * cooperate:
9185          */
9186         if (rcvd->max_ops < sent->max_ops)
9187                 return -EINVAL;
9188         if (rcvd->max_reqs == 0)
9189                 return -EINVAL;
9190         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9191                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9192         return 0;
9193 }
9194
9195 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9196                 struct nfs41_create_session_res *res)
9197 {
9198         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9199         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9200
9201         if (!(res->flags & SESSION4_BACK_CHAN))
9202                 goto out;
9203         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9204                 return -EINVAL;
9205         if (rcvd->max_resp_sz < sent->max_resp_sz)
9206                 return -EINVAL;
9207         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9208                 return -EINVAL;
9209         if (rcvd->max_ops > sent->max_ops)
9210                 return -EINVAL;
9211         if (rcvd->max_reqs > sent->max_reqs)
9212                 return -EINVAL;
9213 out:
9214         return 0;
9215 }
9216
9217 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9218                                      struct nfs41_create_session_res *res)
9219 {
9220         int ret;
9221
9222         ret = nfs4_verify_fore_channel_attrs(args, res);
9223         if (ret)
9224                 return ret;
9225         return nfs4_verify_back_channel_attrs(args, res);
9226 }
9227
9228 static void nfs4_update_session(struct nfs4_session *session,
9229                 struct nfs41_create_session_res *res)
9230 {
9231         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9232         /* Mark client id and session as being confirmed */
9233         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9234         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9235         session->flags = res->flags;
9236         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9237         if (res->flags & SESSION4_BACK_CHAN)
9238                 memcpy(&session->bc_attrs, &res->bc_attrs,
9239                                 sizeof(session->bc_attrs));
9240 }
9241
9242 static int _nfs4_proc_create_session(struct nfs_client *clp,
9243                 const struct cred *cred)
9244 {
9245         struct nfs4_session *session = clp->cl_session;
9246         struct nfs41_create_session_args args = {
9247                 .client = clp,
9248                 .clientid = clp->cl_clientid,
9249                 .seqid = clp->cl_seqid,
9250                 .cb_program = NFS4_CALLBACK,
9251         };
9252         struct nfs41_create_session_res res;
9253
9254         struct rpc_message msg = {
9255                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9256                 .rpc_argp = &args,
9257                 .rpc_resp = &res,
9258                 .rpc_cred = cred,
9259         };
9260         int status;
9261
9262         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9263         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9264
9265         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9266                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9267         trace_nfs4_create_session(clp, status);
9268
9269         switch (status) {
9270         case -NFS4ERR_STALE_CLIENTID:
9271         case -NFS4ERR_DELAY:
9272         case -ETIMEDOUT:
9273         case -EACCES:
9274         case -EAGAIN:
9275                 goto out;
9276         }
9277
9278         clp->cl_seqid++;
9279         if (!status) {
9280                 /* Verify the session's negotiated channel_attrs values */
9281                 status = nfs4_verify_channel_attrs(&args, &res);
9282                 /* Increment the clientid slot sequence id */
9283                 if (status)
9284                         goto out;
9285                 nfs4_update_session(session, &res);
9286         }
9287 out:
9288         return status;
9289 }
9290
9291 /*
9292  * Issues a CREATE_SESSION operation to the server.
9293  * It is the responsibility of the caller to verify the session is
9294  * expired before calling this routine.
9295  */
9296 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9297 {
9298         int status;
9299         unsigned *ptr;
9300         struct nfs4_session *session = clp->cl_session;
9301         struct nfs4_add_xprt_data xprtdata = {
9302                 .clp = clp,
9303         };
9304         struct rpc_add_xprt_test rpcdata = {
9305                 .add_xprt_test = clp->cl_mvops->session_trunk,
9306                 .data = &xprtdata,
9307         };
9308
9309         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9310
9311         status = _nfs4_proc_create_session(clp, cred);
9312         if (status)
9313                 goto out;
9314
9315         /* Init or reset the session slot tables */
9316         status = nfs4_setup_session_slot_tables(session);
9317         dprintk("slot table setup returned %d\n", status);
9318         if (status)
9319                 goto out;
9320
9321         ptr = (unsigned *)&session->sess_id.data[0];
9322         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9323                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9324         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9325 out:
9326         return status;
9327 }
9328
9329 /*
9330  * Issue the over-the-wire RPC DESTROY_SESSION.
9331  * The caller must serialize access to this routine.
9332  */
9333 int nfs4_proc_destroy_session(struct nfs4_session *session,
9334                 const struct cred *cred)
9335 {
9336         struct rpc_message msg = {
9337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9338                 .rpc_argp = session,
9339                 .rpc_cred = cred,
9340         };
9341         int status = 0;
9342
9343         /* session is still being setup */
9344         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9345                 return 0;
9346
9347         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9348                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9349         trace_nfs4_destroy_session(session->clp, status);
9350
9351         if (status)
9352                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9353                         "Session has been destroyed regardless...\n", status);
9354         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9355         return status;
9356 }
9357
9358 /*
9359  * Renew the cl_session lease.
9360  */
9361 struct nfs4_sequence_data {
9362         struct nfs_client *clp;
9363         struct nfs4_sequence_args args;
9364         struct nfs4_sequence_res res;
9365 };
9366
9367 static void nfs41_sequence_release(void *data)
9368 {
9369         struct nfs4_sequence_data *calldata = data;
9370         struct nfs_client *clp = calldata->clp;
9371
9372         if (refcount_read(&clp->cl_count) > 1)
9373                 nfs4_schedule_state_renewal(clp);
9374         nfs_put_client(clp);
9375         kfree(calldata);
9376 }
9377
9378 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9379 {
9380         switch(task->tk_status) {
9381         case -NFS4ERR_DELAY:
9382                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9383                 return -EAGAIN;
9384         default:
9385                 nfs4_schedule_lease_recovery(clp);
9386         }
9387         return 0;
9388 }
9389
9390 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9391 {
9392         struct nfs4_sequence_data *calldata = data;
9393         struct nfs_client *clp = calldata->clp;
9394
9395         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9396                 return;
9397
9398         trace_nfs4_sequence(clp, task->tk_status);
9399         if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9400                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9401                 if (refcount_read(&clp->cl_count) == 1)
9402                         return;
9403
9404                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9405                         rpc_restart_call_prepare(task);
9406                         return;
9407                 }
9408         }
9409         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9410 }
9411
9412 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9413 {
9414         struct nfs4_sequence_data *calldata = data;
9415         struct nfs_client *clp = calldata->clp;
9416         struct nfs4_sequence_args *args;
9417         struct nfs4_sequence_res *res;
9418
9419         args = task->tk_msg.rpc_argp;
9420         res = task->tk_msg.rpc_resp;
9421
9422         nfs4_setup_sequence(clp, args, res, task);
9423 }
9424
9425 static const struct rpc_call_ops nfs41_sequence_ops = {
9426         .rpc_call_done = nfs41_sequence_call_done,
9427         .rpc_call_prepare = nfs41_sequence_prepare,
9428         .rpc_release = nfs41_sequence_release,
9429 };
9430
9431 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9432                 const struct cred *cred,
9433                 struct nfs4_slot *slot,
9434                 bool is_privileged)
9435 {
9436         struct nfs4_sequence_data *calldata;
9437         struct rpc_message msg = {
9438                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9439                 .rpc_cred = cred,
9440         };
9441         struct rpc_task_setup task_setup_data = {
9442                 .rpc_client = clp->cl_rpcclient,
9443                 .rpc_message = &msg,
9444                 .callback_ops = &nfs41_sequence_ops,
9445                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9446         };
9447         struct rpc_task *ret;
9448
9449         ret = ERR_PTR(-EIO);
9450         if (!refcount_inc_not_zero(&clp->cl_count))
9451                 goto out_err;
9452
9453         ret = ERR_PTR(-ENOMEM);
9454         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9455         if (calldata == NULL)
9456                 goto out_put_clp;
9457         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9458         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9459         msg.rpc_argp = &calldata->args;
9460         msg.rpc_resp = &calldata->res;
9461         calldata->clp = clp;
9462         task_setup_data.callback_data = calldata;
9463
9464         ret = rpc_run_task(&task_setup_data);
9465         if (IS_ERR(ret))
9466                 goto out_err;
9467         return ret;
9468 out_put_clp:
9469         nfs_put_client(clp);
9470 out_err:
9471         nfs41_release_slot(slot);
9472         return ret;
9473 }
9474
9475 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9476 {
9477         struct rpc_task *task;
9478         int ret = 0;
9479
9480         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9481                 return -EAGAIN;
9482         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9483         if (IS_ERR(task))
9484                 ret = PTR_ERR(task);
9485         else
9486                 rpc_put_task_async(task);
9487         dprintk("<-- %s status=%d\n", __func__, ret);
9488         return ret;
9489 }
9490
9491 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9492 {
9493         struct rpc_task *task;
9494         int ret;
9495
9496         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9497         if (IS_ERR(task)) {
9498                 ret = PTR_ERR(task);
9499                 goto out;
9500         }
9501         ret = rpc_wait_for_completion_task(task);
9502         if (!ret)
9503                 ret = task->tk_status;
9504         rpc_put_task(task);
9505 out:
9506         dprintk("<-- %s status=%d\n", __func__, ret);
9507         return ret;
9508 }
9509
9510 struct nfs4_reclaim_complete_data {
9511         struct nfs_client *clp;
9512         struct nfs41_reclaim_complete_args arg;
9513         struct nfs41_reclaim_complete_res res;
9514 };
9515
9516 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9517 {
9518         struct nfs4_reclaim_complete_data *calldata = data;
9519
9520         nfs4_setup_sequence(calldata->clp,
9521                         &calldata->arg.seq_args,
9522                         &calldata->res.seq_res,
9523                         task);
9524 }
9525
9526 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9527 {
9528         switch(task->tk_status) {
9529         case 0:
9530                 wake_up_all(&clp->cl_lock_waitq);
9531                 fallthrough;
9532         case -NFS4ERR_COMPLETE_ALREADY:
9533         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9534                 break;
9535         case -NFS4ERR_DELAY:
9536                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9537                 fallthrough;
9538         case -NFS4ERR_RETRY_UNCACHED_REP:
9539         case -EACCES:
9540                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9541                         __func__, task->tk_status, clp->cl_hostname);
9542                 return -EAGAIN;
9543         case -NFS4ERR_BADSESSION:
9544         case -NFS4ERR_DEADSESSION:
9545         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9546                 break;
9547         default:
9548                 nfs4_schedule_lease_recovery(clp);
9549         }
9550         return 0;
9551 }
9552
9553 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9554 {
9555         struct nfs4_reclaim_complete_data *calldata = data;
9556         struct nfs_client *clp = calldata->clp;
9557         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9558
9559         if (!nfs41_sequence_done(task, res))
9560                 return;
9561
9562         trace_nfs4_reclaim_complete(clp, task->tk_status);
9563         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9564                 rpc_restart_call_prepare(task);
9565                 return;
9566         }
9567 }
9568
9569 static void nfs4_free_reclaim_complete_data(void *data)
9570 {
9571         struct nfs4_reclaim_complete_data *calldata = data;
9572
9573         kfree(calldata);
9574 }
9575
9576 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9577         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9578         .rpc_call_done = nfs4_reclaim_complete_done,
9579         .rpc_release = nfs4_free_reclaim_complete_data,
9580 };
9581
9582 /*
9583  * Issue a global reclaim complete.
9584  */
9585 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9586                 const struct cred *cred)
9587 {
9588         struct nfs4_reclaim_complete_data *calldata;
9589         struct rpc_message msg = {
9590                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9591                 .rpc_cred = cred,
9592         };
9593         struct rpc_task_setup task_setup_data = {
9594                 .rpc_client = clp->cl_rpcclient,
9595                 .rpc_message = &msg,
9596                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9597                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9598         };
9599         int status = -ENOMEM;
9600
9601         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9602         if (calldata == NULL)
9603                 goto out;
9604         calldata->clp = clp;
9605         calldata->arg.one_fs = 0;
9606
9607         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9608         msg.rpc_argp = &calldata->arg;
9609         msg.rpc_resp = &calldata->res;
9610         task_setup_data.callback_data = calldata;
9611         status = nfs4_call_sync_custom(&task_setup_data);
9612 out:
9613         dprintk("<-- %s status=%d\n", __func__, status);
9614         return status;
9615 }
9616
9617 static void
9618 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9619 {
9620         struct nfs4_layoutget *lgp = calldata;
9621         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9622
9623         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9624                                 &lgp->res.seq_res, task);
9625 }
9626
9627 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9628 {
9629         struct nfs4_layoutget *lgp = calldata;
9630
9631         nfs41_sequence_process(task, &lgp->res.seq_res);
9632 }
9633
9634 static int
9635 nfs4_layoutget_handle_exception(struct rpc_task *task,
9636                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9637 {
9638         struct inode *inode = lgp->args.inode;
9639         struct nfs_server *server = NFS_SERVER(inode);
9640         struct pnfs_layout_hdr *lo = lgp->lo;
9641         int nfs4err = task->tk_status;
9642         int err, status = 0;
9643         LIST_HEAD(head);
9644
9645         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9646
9647         nfs4_sequence_free_slot(&lgp->res.seq_res);
9648
9649         switch (nfs4err) {
9650         case 0:
9651                 goto out;
9652
9653         /*
9654          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9655          * on the file. set tk_status to -ENODATA to tell upper layer to
9656          * retry go inband.
9657          */
9658         case -NFS4ERR_LAYOUTUNAVAILABLE:
9659                 status = -ENODATA;
9660                 goto out;
9661         /*
9662          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9663          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9664          */
9665         case -NFS4ERR_BADLAYOUT:
9666                 status = -EOVERFLOW;
9667                 goto out;
9668         /*
9669          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9670          * (or clients) writing to the same RAID stripe except when
9671          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9672          *
9673          * Treat it like we would RECALLCONFLICT -- we retry for a little
9674          * while, and then eventually give up.
9675          */
9676         case -NFS4ERR_LAYOUTTRYLATER:
9677                 if (lgp->args.minlength == 0) {
9678                         status = -EOVERFLOW;
9679                         goto out;
9680                 }
9681                 status = -EBUSY;
9682                 break;
9683         case -NFS4ERR_RECALLCONFLICT:
9684                 status = -ERECALLCONFLICT;
9685                 break;
9686         case -NFS4ERR_DELEG_REVOKED:
9687         case -NFS4ERR_ADMIN_REVOKED:
9688         case -NFS4ERR_EXPIRED:
9689         case -NFS4ERR_BAD_STATEID:
9690                 exception->timeout = 0;
9691                 spin_lock(&inode->i_lock);
9692                 /* If the open stateid was bad, then recover it. */
9693                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9694                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9695                         spin_unlock(&inode->i_lock);
9696                         exception->state = lgp->args.ctx->state;
9697                         exception->stateid = &lgp->args.stateid;
9698                         break;
9699                 }
9700
9701                 /*
9702                  * Mark the bad layout state as invalid, then retry
9703                  */
9704                 pnfs_mark_layout_stateid_invalid(lo, &head);
9705                 spin_unlock(&inode->i_lock);
9706                 nfs_commit_inode(inode, 0);
9707                 pnfs_free_lseg_list(&head);
9708                 status = -EAGAIN;
9709                 goto out;
9710         }
9711
9712         err = nfs4_handle_exception(server, nfs4err, exception);
9713         if (!status) {
9714                 if (exception->retry)
9715                         status = -EAGAIN;
9716                 else
9717                         status = err;
9718         }
9719 out:
9720         return status;
9721 }
9722
9723 size_t max_response_pages(struct nfs_server *server)
9724 {
9725         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9726         return nfs_page_array_len(0, max_resp_sz);
9727 }
9728
9729 static void nfs4_layoutget_release(void *calldata)
9730 {
9731         struct nfs4_layoutget *lgp = calldata;
9732
9733         nfs4_sequence_free_slot(&lgp->res.seq_res);
9734         pnfs_layoutget_free(lgp);
9735 }
9736
9737 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9738         .rpc_call_prepare = nfs4_layoutget_prepare,
9739         .rpc_call_done = nfs4_layoutget_done,
9740         .rpc_release = nfs4_layoutget_release,
9741 };
9742
9743 struct pnfs_layout_segment *
9744 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9745 {
9746         struct inode *inode = lgp->args.inode;
9747         struct nfs_server *server = NFS_SERVER(inode);
9748         struct rpc_task *task;
9749         struct rpc_message msg = {
9750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9751                 .rpc_argp = &lgp->args,
9752                 .rpc_resp = &lgp->res,
9753                 .rpc_cred = lgp->cred,
9754         };
9755         struct rpc_task_setup task_setup_data = {
9756                 .rpc_client = server->client,
9757                 .rpc_message = &msg,
9758                 .callback_ops = &nfs4_layoutget_call_ops,
9759                 .callback_data = lgp,
9760                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9761                          RPC_TASK_MOVEABLE,
9762         };
9763         struct pnfs_layout_segment *lseg = NULL;
9764         struct nfs4_exception exception = {
9765                 .inode = inode,
9766                 .timeout = *timeout,
9767         };
9768         int status = 0;
9769
9770         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9771
9772         task = rpc_run_task(&task_setup_data);
9773         if (IS_ERR(task))
9774                 return ERR_CAST(task);
9775
9776         status = rpc_wait_for_completion_task(task);
9777         if (status != 0)
9778                 goto out;
9779
9780         if (task->tk_status < 0) {
9781                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9782                 *timeout = exception.timeout;
9783         } else if (lgp->res.layoutp->len == 0) {
9784                 status = -EAGAIN;
9785                 *timeout = nfs4_update_delay(&exception.timeout);
9786         } else
9787                 lseg = pnfs_layout_process(lgp);
9788 out:
9789         trace_nfs4_layoutget(lgp->args.ctx,
9790                         &lgp->args.range,
9791                         &lgp->res.range,
9792                         &lgp->res.stateid,
9793                         status);
9794
9795         rpc_put_task(task);
9796         dprintk("<-- %s status=%d\n", __func__, status);
9797         if (status)
9798                 return ERR_PTR(status);
9799         return lseg;
9800 }
9801
9802 static void
9803 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9804 {
9805         struct nfs4_layoutreturn *lrp = calldata;
9806
9807         nfs4_setup_sequence(lrp->clp,
9808                         &lrp->args.seq_args,
9809                         &lrp->res.seq_res,
9810                         task);
9811         if (!pnfs_layout_is_valid(lrp->args.layout))
9812                 rpc_exit(task, 0);
9813 }
9814
9815 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9816 {
9817         struct nfs4_layoutreturn *lrp = calldata;
9818         struct nfs_server *server;
9819
9820         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9821                 return;
9822
9823         /*
9824          * Was there an RPC level error? Assume the call succeeded,
9825          * and that we need to release the layout
9826          */
9827         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9828                 lrp->res.lrs_present = 0;
9829                 return;
9830         }
9831
9832         server = NFS_SERVER(lrp->args.inode);
9833         switch (task->tk_status) {
9834         case -NFS4ERR_OLD_STATEID:
9835                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9836                                         &lrp->args.range,
9837                                         lrp->args.inode))
9838                         goto out_restart;
9839                 fallthrough;
9840         default:
9841                 task->tk_status = 0;
9842                 fallthrough;
9843         case 0:
9844                 break;
9845         case -NFS4ERR_DELAY:
9846                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9847                         break;
9848                 goto out_restart;
9849         }
9850         return;
9851 out_restart:
9852         task->tk_status = 0;
9853         nfs4_sequence_free_slot(&lrp->res.seq_res);
9854         rpc_restart_call_prepare(task);
9855 }
9856
9857 static void nfs4_layoutreturn_release(void *calldata)
9858 {
9859         struct nfs4_layoutreturn *lrp = calldata;
9860         struct pnfs_layout_hdr *lo = lrp->args.layout;
9861
9862         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9863                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9864         nfs4_sequence_free_slot(&lrp->res.seq_res);
9865         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9866                 lrp->ld_private.ops->free(&lrp->ld_private);
9867         pnfs_put_layout_hdr(lrp->args.layout);
9868         nfs_iput_and_deactive(lrp->inode);
9869         put_cred(lrp->cred);
9870         kfree(calldata);
9871 }
9872
9873 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9874         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9875         .rpc_call_done = nfs4_layoutreturn_done,
9876         .rpc_release = nfs4_layoutreturn_release,
9877 };
9878
9879 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9880 {
9881         struct rpc_task *task;
9882         struct rpc_message msg = {
9883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9884                 .rpc_argp = &lrp->args,
9885                 .rpc_resp = &lrp->res,
9886                 .rpc_cred = lrp->cred,
9887         };
9888         struct rpc_task_setup task_setup_data = {
9889                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9890                 .rpc_message = &msg,
9891                 .callback_ops = &nfs4_layoutreturn_call_ops,
9892                 .callback_data = lrp,
9893                 .flags = RPC_TASK_MOVEABLE,
9894         };
9895         int status = 0;
9896
9897         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9898                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9899                         &task_setup_data.rpc_client, &msg);
9900
9901         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9902         if (!sync) {
9903                 if (!lrp->inode) {
9904                         nfs4_layoutreturn_release(lrp);
9905                         return -EAGAIN;
9906                 }
9907                 task_setup_data.flags |= RPC_TASK_ASYNC;
9908         }
9909         if (!lrp->inode)
9910                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9911                                    1);
9912         else
9913                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9914                                    0);
9915         task = rpc_run_task(&task_setup_data);
9916         if (IS_ERR(task))
9917                 return PTR_ERR(task);
9918         if (sync)
9919                 status = task->tk_status;
9920         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9921         dprintk("<-- %s status=%d\n", __func__, status);
9922         rpc_put_task(task);
9923         return status;
9924 }
9925
9926 static int
9927 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9928                 struct pnfs_device *pdev,
9929                 const struct cred *cred)
9930 {
9931         struct nfs4_getdeviceinfo_args args = {
9932                 .pdev = pdev,
9933                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9934                         NOTIFY_DEVICEID4_DELETE,
9935         };
9936         struct nfs4_getdeviceinfo_res res = {
9937                 .pdev = pdev,
9938         };
9939         struct rpc_message msg = {
9940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9941                 .rpc_argp = &args,
9942                 .rpc_resp = &res,
9943                 .rpc_cred = cred,
9944         };
9945         int status;
9946
9947         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9948         if (res.notification & ~args.notify_types)
9949                 dprintk("%s: unsupported notification\n", __func__);
9950         if (res.notification != args.notify_types)
9951                 pdev->nocache = 1;
9952
9953         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9954
9955         dprintk("<-- %s status=%d\n", __func__, status);
9956
9957         return status;
9958 }
9959
9960 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9961                 struct pnfs_device *pdev,
9962                 const struct cred *cred)
9963 {
9964         struct nfs4_exception exception = { };
9965         int err;
9966
9967         do {
9968                 err = nfs4_handle_exception(server,
9969                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9970                                         &exception);
9971         } while (exception.retry);
9972         return err;
9973 }
9974 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9975
9976 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9977 {
9978         struct nfs4_layoutcommit_data *data = calldata;
9979         struct nfs_server *server = NFS_SERVER(data->args.inode);
9980
9981         nfs4_setup_sequence(server->nfs_client,
9982                         &data->args.seq_args,
9983                         &data->res.seq_res,
9984                         task);
9985 }
9986
9987 static void
9988 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9989 {
9990         struct nfs4_layoutcommit_data *data = calldata;
9991         struct nfs_server *server = NFS_SERVER(data->args.inode);
9992
9993         if (!nfs41_sequence_done(task, &data->res.seq_res))
9994                 return;
9995
9996         switch (task->tk_status) { /* Just ignore these failures */
9997         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9998         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9999         case -NFS4ERR_BADLAYOUT:     /* no layout */
10000         case -NFS4ERR_GRACE:        /* loca_recalim always false */
10001                 task->tk_status = 0;
10002                 break;
10003         case 0:
10004                 break;
10005         default:
10006                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10007                         rpc_restart_call_prepare(task);
10008                         return;
10009                 }
10010         }
10011 }
10012
10013 static void nfs4_layoutcommit_release(void *calldata)
10014 {
10015         struct nfs4_layoutcommit_data *data = calldata;
10016
10017         pnfs_cleanup_layoutcommit(data);
10018         nfs_post_op_update_inode_force_wcc(data->args.inode,
10019                                            data->res.fattr);
10020         put_cred(data->cred);
10021         nfs_iput_and_deactive(data->inode);
10022         kfree(data);
10023 }
10024
10025 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10026         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10027         .rpc_call_done = nfs4_layoutcommit_done,
10028         .rpc_release = nfs4_layoutcommit_release,
10029 };
10030
10031 int
10032 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10033 {
10034         struct rpc_message msg = {
10035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10036                 .rpc_argp = &data->args,
10037                 .rpc_resp = &data->res,
10038                 .rpc_cred = data->cred,
10039         };
10040         struct rpc_task_setup task_setup_data = {
10041                 .task = &data->task,
10042                 .rpc_client = NFS_CLIENT(data->args.inode),
10043                 .rpc_message = &msg,
10044                 .callback_ops = &nfs4_layoutcommit_ops,
10045                 .callback_data = data,
10046                 .flags = RPC_TASK_MOVEABLE,
10047         };
10048         struct rpc_task *task;
10049         int status = 0;
10050
10051         dprintk("NFS: initiating layoutcommit call. sync %d "
10052                 "lbw: %llu inode %lu\n", sync,
10053                 data->args.lastbytewritten,
10054                 data->args.inode->i_ino);
10055
10056         if (!sync) {
10057                 data->inode = nfs_igrab_and_active(data->args.inode);
10058                 if (data->inode == NULL) {
10059                         nfs4_layoutcommit_release(data);
10060                         return -EAGAIN;
10061                 }
10062                 task_setup_data.flags = RPC_TASK_ASYNC;
10063         }
10064         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10065         task = rpc_run_task(&task_setup_data);
10066         if (IS_ERR(task))
10067                 return PTR_ERR(task);
10068         if (sync)
10069                 status = task->tk_status;
10070         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10071         dprintk("%s: status %d\n", __func__, status);
10072         rpc_put_task(task);
10073         return status;
10074 }
10075
10076 /*
10077  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10078  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10079  */
10080 static int
10081 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10082                     struct nfs_fsinfo *info,
10083                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10084 {
10085         struct nfs41_secinfo_no_name_args args = {
10086                 .style = SECINFO_STYLE_CURRENT_FH,
10087         };
10088         struct nfs4_secinfo_res res = {
10089                 .flavors = flavors,
10090         };
10091         struct rpc_message msg = {
10092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10093                 .rpc_argp = &args,
10094                 .rpc_resp = &res,
10095         };
10096         struct nfs4_call_sync_data data = {
10097                 .seq_server = server,
10098                 .seq_args = &args.seq_args,
10099                 .seq_res = &res.seq_res,
10100         };
10101         struct rpc_task_setup task_setup = {
10102                 .rpc_client = server->client,
10103                 .rpc_message = &msg,
10104                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10105                 .callback_data = &data,
10106                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10107         };
10108         const struct cred *cred = NULL;
10109         int status;
10110
10111         if (use_integrity) {
10112                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10113
10114                 cred = nfs4_get_clid_cred(server->nfs_client);
10115                 msg.rpc_cred = cred;
10116         }
10117
10118         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10119         status = nfs4_call_sync_custom(&task_setup);
10120         dprintk("<-- %s status=%d\n", __func__, status);
10121
10122         put_cred(cred);
10123
10124         return status;
10125 }
10126
10127 static int
10128 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10129                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10130 {
10131         struct nfs4_exception exception = {
10132                 .interruptible = true,
10133         };
10134         int err;
10135         do {
10136                 /* first try using integrity protection */
10137                 err = -NFS4ERR_WRONGSEC;
10138
10139                 /* try to use integrity protection with machine cred */
10140                 if (_nfs4_is_integrity_protected(server->nfs_client))
10141                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10142                                                           flavors, true);
10143
10144                 /*
10145                  * if unable to use integrity protection, or SECINFO with
10146                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10147                  * disallowed by spec, but exists in deployed servers) use
10148                  * the current filesystem's rpc_client and the user cred.
10149                  */
10150                 if (err == -NFS4ERR_WRONGSEC)
10151                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10152                                                           flavors, false);
10153
10154                 switch (err) {
10155                 case 0:
10156                 case -NFS4ERR_WRONGSEC:
10157                 case -ENOTSUPP:
10158                         goto out;
10159                 default:
10160                         err = nfs4_handle_exception(server, err, &exception);
10161                 }
10162         } while (exception.retry);
10163 out:
10164         return err;
10165 }
10166
10167 static int
10168 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10169                     struct nfs_fsinfo *info)
10170 {
10171         int err;
10172         struct page *page;
10173         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10174         struct nfs4_secinfo_flavors *flavors;
10175         struct nfs4_secinfo4 *secinfo;
10176         int i;
10177
10178         page = alloc_page(GFP_KERNEL);
10179         if (!page) {
10180                 err = -ENOMEM;
10181                 goto out;
10182         }
10183
10184         flavors = page_address(page);
10185         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10186
10187         /*
10188          * Fall back on "guess and check" method if
10189          * the server doesn't support SECINFO_NO_NAME
10190          */
10191         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10192                 err = nfs4_find_root_sec(server, fhandle, info);
10193                 goto out_freepage;
10194         }
10195         if (err)
10196                 goto out_freepage;
10197
10198         for (i = 0; i < flavors->num_flavors; i++) {
10199                 secinfo = &flavors->flavors[i];
10200
10201                 switch (secinfo->flavor) {
10202                 case RPC_AUTH_NULL:
10203                 case RPC_AUTH_UNIX:
10204                 case RPC_AUTH_GSS:
10205                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10206                                         &secinfo->flavor_info);
10207                         break;
10208                 default:
10209                         flavor = RPC_AUTH_MAXFLAVOR;
10210                         break;
10211                 }
10212
10213                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10214                         flavor = RPC_AUTH_MAXFLAVOR;
10215
10216                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10217                         err = nfs4_lookup_root_sec(server, fhandle,
10218                                                    info, flavor);
10219                         if (!err)
10220                                 break;
10221                 }
10222         }
10223
10224         if (flavor == RPC_AUTH_MAXFLAVOR)
10225                 err = -EPERM;
10226
10227 out_freepage:
10228         put_page(page);
10229         if (err == -EACCES)
10230                 return -EPERM;
10231 out:
10232         return err;
10233 }
10234
10235 static int _nfs41_test_stateid(struct nfs_server *server,
10236                 nfs4_stateid *stateid,
10237                 const struct cred *cred)
10238 {
10239         int status;
10240         struct nfs41_test_stateid_args args = {
10241                 .stateid = stateid,
10242         };
10243         struct nfs41_test_stateid_res res;
10244         struct rpc_message msg = {
10245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10246                 .rpc_argp = &args,
10247                 .rpc_resp = &res,
10248                 .rpc_cred = cred,
10249         };
10250         struct rpc_clnt *rpc_client = server->client;
10251
10252         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10253                 &rpc_client, &msg);
10254
10255         dprintk("NFS call  test_stateid %p\n", stateid);
10256         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10257         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10258                         &args.seq_args, &res.seq_res);
10259         if (status != NFS_OK) {
10260                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10261                 return status;
10262         }
10263         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10264         return -res.status;
10265 }
10266
10267 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10268                 int err, struct nfs4_exception *exception)
10269 {
10270         exception->retry = 0;
10271         switch(err) {
10272         case -NFS4ERR_DELAY:
10273         case -NFS4ERR_RETRY_UNCACHED_REP:
10274                 nfs4_handle_exception(server, err, exception);
10275                 break;
10276         case -NFS4ERR_BADSESSION:
10277         case -NFS4ERR_BADSLOT:
10278         case -NFS4ERR_BAD_HIGH_SLOT:
10279         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10280         case -NFS4ERR_DEADSESSION:
10281                 nfs4_do_handle_exception(server, err, exception);
10282         }
10283 }
10284
10285 /**
10286  * nfs41_test_stateid - perform a TEST_STATEID operation
10287  *
10288  * @server: server / transport on which to perform the operation
10289  * @stateid: state ID to test
10290  * @cred: credential
10291  *
10292  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10293  * Otherwise a negative NFS4ERR value is returned if the operation
10294  * failed or the state ID is not currently valid.
10295  */
10296 static int nfs41_test_stateid(struct nfs_server *server,
10297                 nfs4_stateid *stateid,
10298                 const struct cred *cred)
10299 {
10300         struct nfs4_exception exception = {
10301                 .interruptible = true,
10302         };
10303         int err;
10304         do {
10305                 err = _nfs41_test_stateid(server, stateid, cred);
10306                 nfs4_handle_delay_or_session_error(server, err, &exception);
10307         } while (exception.retry);
10308         return err;
10309 }
10310
10311 struct nfs_free_stateid_data {
10312         struct nfs_server *server;
10313         struct nfs41_free_stateid_args args;
10314         struct nfs41_free_stateid_res res;
10315 };
10316
10317 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10318 {
10319         struct nfs_free_stateid_data *data = calldata;
10320         nfs4_setup_sequence(data->server->nfs_client,
10321                         &data->args.seq_args,
10322                         &data->res.seq_res,
10323                         task);
10324 }
10325
10326 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10327 {
10328         struct nfs_free_stateid_data *data = calldata;
10329
10330         nfs41_sequence_done(task, &data->res.seq_res);
10331
10332         switch (task->tk_status) {
10333         case -NFS4ERR_DELAY:
10334                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10335                         rpc_restart_call_prepare(task);
10336         }
10337 }
10338
10339 static void nfs41_free_stateid_release(void *calldata)
10340 {
10341         struct nfs_free_stateid_data *data = calldata;
10342         struct nfs_client *clp = data->server->nfs_client;
10343
10344         nfs_put_client(clp);
10345         kfree(calldata);
10346 }
10347
10348 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10349         .rpc_call_prepare = nfs41_free_stateid_prepare,
10350         .rpc_call_done = nfs41_free_stateid_done,
10351         .rpc_release = nfs41_free_stateid_release,
10352 };
10353
10354 /**
10355  * nfs41_free_stateid - perform a FREE_STATEID operation
10356  *
10357  * @server: server / transport on which to perform the operation
10358  * @stateid: state ID to release
10359  * @cred: credential
10360  * @privileged: set to true if this call needs to be privileged
10361  *
10362  * Note: this function is always asynchronous.
10363  */
10364 static int nfs41_free_stateid(struct nfs_server *server,
10365                 const nfs4_stateid *stateid,
10366                 const struct cred *cred,
10367                 bool privileged)
10368 {
10369         struct rpc_message msg = {
10370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10371                 .rpc_cred = cred,
10372         };
10373         struct rpc_task_setup task_setup = {
10374                 .rpc_client = server->client,
10375                 .rpc_message = &msg,
10376                 .callback_ops = &nfs41_free_stateid_ops,
10377                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10378         };
10379         struct nfs_free_stateid_data *data;
10380         struct rpc_task *task;
10381         struct nfs_client *clp = server->nfs_client;
10382
10383         if (!refcount_inc_not_zero(&clp->cl_count))
10384                 return -EIO;
10385
10386         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10387                 &task_setup.rpc_client, &msg);
10388
10389         dprintk("NFS call  free_stateid %p\n", stateid);
10390         data = kmalloc(sizeof(*data), GFP_KERNEL);
10391         if (!data)
10392                 return -ENOMEM;
10393         data->server = server;
10394         nfs4_stateid_copy(&data->args.stateid, stateid);
10395
10396         task_setup.callback_data = data;
10397
10398         msg.rpc_argp = &data->args;
10399         msg.rpc_resp = &data->res;
10400         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10401         task = rpc_run_task(&task_setup);
10402         if (IS_ERR(task))
10403                 return PTR_ERR(task);
10404         rpc_put_task(task);
10405         return 0;
10406 }
10407
10408 static void
10409 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10410 {
10411         const struct cred *cred = lsp->ls_state->owner->so_cred;
10412
10413         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10414         nfs4_free_lock_state(server, lsp);
10415 }
10416
10417 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10418                 const nfs4_stateid *s2)
10419 {
10420         if (s1->type != s2->type)
10421                 return false;
10422
10423         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10424                 return false;
10425
10426         if (s1->seqid == s2->seqid)
10427                 return true;
10428
10429         return s1->seqid == 0 || s2->seqid == 0;
10430 }
10431
10432 #endif /* CONFIG_NFS_V4_1 */
10433
10434 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10435                 const nfs4_stateid *s2)
10436 {
10437         return nfs4_stateid_match(s1, s2);
10438 }
10439
10440
10441 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10442         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10443         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10444         .recover_open   = nfs4_open_reclaim,
10445         .recover_lock   = nfs4_lock_reclaim,
10446         .establish_clid = nfs4_init_clientid,
10447         .detect_trunking = nfs40_discover_server_trunking,
10448 };
10449
10450 #if defined(CONFIG_NFS_V4_1)
10451 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10452         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10453         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10454         .recover_open   = nfs4_open_reclaim,
10455         .recover_lock   = nfs4_lock_reclaim,
10456         .establish_clid = nfs41_init_clientid,
10457         .reclaim_complete = nfs41_proc_reclaim_complete,
10458         .detect_trunking = nfs41_discover_server_trunking,
10459 };
10460 #endif /* CONFIG_NFS_V4_1 */
10461
10462 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10463         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10464         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10465         .recover_open   = nfs40_open_expired,
10466         .recover_lock   = nfs4_lock_expired,
10467         .establish_clid = nfs4_init_clientid,
10468 };
10469
10470 #if defined(CONFIG_NFS_V4_1)
10471 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10472         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10473         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10474         .recover_open   = nfs41_open_expired,
10475         .recover_lock   = nfs41_lock_expired,
10476         .establish_clid = nfs41_init_clientid,
10477 };
10478 #endif /* CONFIG_NFS_V4_1 */
10479
10480 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10481         .sched_state_renewal = nfs4_proc_async_renew,
10482         .get_state_renewal_cred = nfs4_get_renew_cred,
10483         .renew_lease = nfs4_proc_renew,
10484 };
10485
10486 #if defined(CONFIG_NFS_V4_1)
10487 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10488         .sched_state_renewal = nfs41_proc_async_sequence,
10489         .get_state_renewal_cred = nfs4_get_machine_cred,
10490         .renew_lease = nfs4_proc_sequence,
10491 };
10492 #endif
10493
10494 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10495         .get_locations = _nfs40_proc_get_locations,
10496         .fsid_present = _nfs40_proc_fsid_present,
10497 };
10498
10499 #if defined(CONFIG_NFS_V4_1)
10500 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10501         .get_locations = _nfs41_proc_get_locations,
10502         .fsid_present = _nfs41_proc_fsid_present,
10503 };
10504 #endif  /* CONFIG_NFS_V4_1 */
10505
10506 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10507         .minor_version = 0,
10508         .init_caps = NFS_CAP_READDIRPLUS
10509                 | NFS_CAP_ATOMIC_OPEN
10510                 | NFS_CAP_POSIX_LOCK,
10511         .init_client = nfs40_init_client,
10512         .shutdown_client = nfs40_shutdown_client,
10513         .match_stateid = nfs4_match_stateid,
10514         .find_root_sec = nfs4_find_root_sec,
10515         .free_lock_state = nfs4_release_lockowner,
10516         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10517         .alloc_seqid = nfs_alloc_seqid,
10518         .call_sync_ops = &nfs40_call_sync_ops,
10519         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10520         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10521         .state_renewal_ops = &nfs40_state_renewal_ops,
10522         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10523 };
10524
10525 #if defined(CONFIG_NFS_V4_1)
10526 static struct nfs_seqid *
10527 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10528 {
10529         return NULL;
10530 }
10531
10532 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10533         .minor_version = 1,
10534         .init_caps = NFS_CAP_READDIRPLUS
10535                 | NFS_CAP_ATOMIC_OPEN
10536                 | NFS_CAP_POSIX_LOCK
10537                 | NFS_CAP_STATEID_NFSV41
10538                 | NFS_CAP_ATOMIC_OPEN_V1
10539                 | NFS_CAP_LGOPEN
10540                 | NFS_CAP_MOVEABLE,
10541         .init_client = nfs41_init_client,
10542         .shutdown_client = nfs41_shutdown_client,
10543         .match_stateid = nfs41_match_stateid,
10544         .find_root_sec = nfs41_find_root_sec,
10545         .free_lock_state = nfs41_free_lock_state,
10546         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10547         .alloc_seqid = nfs_alloc_no_seqid,
10548         .session_trunk = nfs4_test_session_trunk,
10549         .call_sync_ops = &nfs41_call_sync_ops,
10550         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10551         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10552         .state_renewal_ops = &nfs41_state_renewal_ops,
10553         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10554 };
10555 #endif
10556
10557 #if defined(CONFIG_NFS_V4_2)
10558 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10559         .minor_version = 2,
10560         .init_caps = NFS_CAP_READDIRPLUS
10561                 | NFS_CAP_ATOMIC_OPEN
10562                 | NFS_CAP_POSIX_LOCK
10563                 | NFS_CAP_STATEID_NFSV41
10564                 | NFS_CAP_ATOMIC_OPEN_V1
10565                 | NFS_CAP_LGOPEN
10566                 | NFS_CAP_ALLOCATE
10567                 | NFS_CAP_COPY
10568                 | NFS_CAP_OFFLOAD_CANCEL
10569                 | NFS_CAP_COPY_NOTIFY
10570                 | NFS_CAP_DEALLOCATE
10571                 | NFS_CAP_SEEK
10572                 | NFS_CAP_LAYOUTSTATS
10573                 | NFS_CAP_CLONE
10574                 | NFS_CAP_LAYOUTERROR
10575                 | NFS_CAP_READ_PLUS
10576                 | NFS_CAP_MOVEABLE,
10577         .init_client = nfs41_init_client,
10578         .shutdown_client = nfs41_shutdown_client,
10579         .match_stateid = nfs41_match_stateid,
10580         .find_root_sec = nfs41_find_root_sec,
10581         .free_lock_state = nfs41_free_lock_state,
10582         .call_sync_ops = &nfs41_call_sync_ops,
10583         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10584         .alloc_seqid = nfs_alloc_no_seqid,
10585         .session_trunk = nfs4_test_session_trunk,
10586         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10587         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10588         .state_renewal_ops = &nfs41_state_renewal_ops,
10589         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10590 };
10591 #endif
10592
10593 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10594         [0] = &nfs_v4_0_minor_ops,
10595 #if defined(CONFIG_NFS_V4_1)
10596         [1] = &nfs_v4_1_minor_ops,
10597 #endif
10598 #if defined(CONFIG_NFS_V4_2)
10599         [2] = &nfs_v4_2_minor_ops,
10600 #endif
10601 };
10602
10603 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10604 {
10605         ssize_t error, error2, error3;
10606
10607         error = generic_listxattr(dentry, list, size);
10608         if (error < 0)
10609                 return error;
10610         if (list) {
10611                 list += error;
10612                 size -= error;
10613         }
10614
10615         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10616         if (error2 < 0)
10617                 return error2;
10618
10619         if (list) {
10620                 list += error2;
10621                 size -= error2;
10622         }
10623
10624         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10625         if (error3 < 0)
10626                 return error3;
10627
10628         return error + error2 + error3;
10629 }
10630
10631 static void nfs4_enable_swap(struct inode *inode)
10632 {
10633         /* The state manager thread must always be running.
10634          * It will notice the client is a swapper, and stay put.
10635          */
10636         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10637
10638         nfs4_schedule_state_manager(clp);
10639 }
10640
10641 static void nfs4_disable_swap(struct inode *inode)
10642 {
10643         /* The state manager thread will now exit once it is
10644          * woken.
10645          */
10646         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10647
10648         set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10649         clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10650         wake_up_var(&clp->cl_state);
10651 }
10652
10653 static const struct inode_operations nfs4_dir_inode_operations = {
10654         .create         = nfs_create,
10655         .lookup         = nfs_lookup,
10656         .atomic_open    = nfs_atomic_open,
10657         .link           = nfs_link,
10658         .unlink         = nfs_unlink,
10659         .symlink        = nfs_symlink,
10660         .mkdir          = nfs_mkdir,
10661         .rmdir          = nfs_rmdir,
10662         .mknod          = nfs_mknod,
10663         .rename         = nfs_rename,
10664         .permission     = nfs_permission,
10665         .getattr        = nfs_getattr,
10666         .setattr        = nfs_setattr,
10667         .listxattr      = nfs4_listxattr,
10668 };
10669
10670 static const struct inode_operations nfs4_file_inode_operations = {
10671         .permission     = nfs_permission,
10672         .getattr        = nfs_getattr,
10673         .setattr        = nfs_setattr,
10674         .listxattr      = nfs4_listxattr,
10675 };
10676
10677 const struct nfs_rpc_ops nfs_v4_clientops = {
10678         .version        = 4,                    /* protocol version */
10679         .dentry_ops     = &nfs4_dentry_operations,
10680         .dir_inode_ops  = &nfs4_dir_inode_operations,
10681         .file_inode_ops = &nfs4_file_inode_operations,
10682         .file_ops       = &nfs4_file_operations,
10683         .getroot        = nfs4_proc_get_root,
10684         .submount       = nfs4_submount,
10685         .try_get_tree   = nfs4_try_get_tree,
10686         .getattr        = nfs4_proc_getattr,
10687         .setattr        = nfs4_proc_setattr,
10688         .lookup         = nfs4_proc_lookup,
10689         .lookupp        = nfs4_proc_lookupp,
10690         .access         = nfs4_proc_access,
10691         .readlink       = nfs4_proc_readlink,
10692         .create         = nfs4_proc_create,
10693         .remove         = nfs4_proc_remove,
10694         .unlink_setup   = nfs4_proc_unlink_setup,
10695         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10696         .unlink_done    = nfs4_proc_unlink_done,
10697         .rename_setup   = nfs4_proc_rename_setup,
10698         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10699         .rename_done    = nfs4_proc_rename_done,
10700         .link           = nfs4_proc_link,
10701         .symlink        = nfs4_proc_symlink,
10702         .mkdir          = nfs4_proc_mkdir,
10703         .rmdir          = nfs4_proc_rmdir,
10704         .readdir        = nfs4_proc_readdir,
10705         .mknod          = nfs4_proc_mknod,
10706         .statfs         = nfs4_proc_statfs,
10707         .fsinfo         = nfs4_proc_fsinfo,
10708         .pathconf       = nfs4_proc_pathconf,
10709         .set_capabilities = nfs4_server_capabilities,
10710         .decode_dirent  = nfs4_decode_dirent,
10711         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10712         .read_setup     = nfs4_proc_read_setup,
10713         .read_done      = nfs4_read_done,
10714         .write_setup    = nfs4_proc_write_setup,
10715         .write_done     = nfs4_write_done,
10716         .commit_setup   = nfs4_proc_commit_setup,
10717         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10718         .commit_done    = nfs4_commit_done,
10719         .lock           = nfs4_proc_lock,
10720         .clear_acl_cache = nfs4_zap_acl_attr,
10721         .close_context  = nfs4_close_context,
10722         .open_context   = nfs4_atomic_open,
10723         .have_delegation = nfs4_have_delegation,
10724         .alloc_client   = nfs4_alloc_client,
10725         .init_client    = nfs4_init_client,
10726         .free_client    = nfs4_free_client,
10727         .create_server  = nfs4_create_server,
10728         .clone_server   = nfs_clone_server,
10729         .discover_trunking = nfs4_discover_trunking,
10730         .enable_swap    = nfs4_enable_swap,
10731         .disable_swap   = nfs4_disable_swap,
10732 };
10733
10734 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10735         .name   = XATTR_NAME_NFSV4_ACL,
10736         .list   = nfs4_xattr_list_nfs4_acl,
10737         .get    = nfs4_xattr_get_nfs4_acl,
10738         .set    = nfs4_xattr_set_nfs4_acl,
10739 };
10740
10741 #if defined(CONFIG_NFS_V4_1)
10742 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10743         .name   = XATTR_NAME_NFSV4_DACL,
10744         .list   = nfs4_xattr_list_nfs4_dacl,
10745         .get    = nfs4_xattr_get_nfs4_dacl,
10746         .set    = nfs4_xattr_set_nfs4_dacl,
10747 };
10748
10749 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10750         .name   = XATTR_NAME_NFSV4_SACL,
10751         .list   = nfs4_xattr_list_nfs4_sacl,
10752         .get    = nfs4_xattr_get_nfs4_sacl,
10753         .set    = nfs4_xattr_set_nfs4_sacl,
10754 };
10755 #endif
10756
10757 #ifdef CONFIG_NFS_V4_2
10758 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10759         .prefix = XATTR_USER_PREFIX,
10760         .get    = nfs4_xattr_get_nfs4_user,
10761         .set    = nfs4_xattr_set_nfs4_user,
10762 };
10763 #endif
10764
10765 const struct xattr_handler *nfs4_xattr_handlers[] = {
10766         &nfs4_xattr_nfs4_acl_handler,
10767 #if defined(CONFIG_NFS_V4_1)
10768         &nfs4_xattr_nfs4_dacl_handler,
10769         &nfs4_xattr_nfs4_sacl_handler,
10770 #endif
10771 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10772         &nfs4_xattr_nfs4_label_handler,
10773 #endif
10774 #ifdef CONFIG_NFS_V4_2
10775         &nfs4_xattr_nfs4_user_handler,
10776 #endif
10777         NULL
10778 };