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/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.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 "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_FILE_OPEN:
 162                 return -EBUSY;
 163         default:
 164                 dprintk("%s could not handle NFSv4 error %d\n",
 165                                 __func__, -err);
 166                 break;
 167         }
 168         return -EIO;
 169 }
 170
 171 /*
 172  * This is our standard bitmap for GETATTR requests.
 173  */
 174 const u32 nfs4_fattr_bitmap[3] = {
 175         FATTR4_WORD0_TYPE
 176         | FATTR4_WORD0_CHANGE
 177         | FATTR4_WORD0_SIZE
 178         | FATTR4_WORD0_FSID
 179         | FATTR4_WORD0_FILEID,
 180         FATTR4_WORD1_MODE
 181         | FATTR4_WORD1_NUMLINKS
 182         | FATTR4_WORD1_OWNER
 183         | FATTR4_WORD1_OWNER_GROUP
 184         | FATTR4_WORD1_RAWDEV
 185         | FATTR4_WORD1_SPACE_USED
 186         | FATTR4_WORD1_TIME_ACCESS
 187         | FATTR4_WORD1_TIME_METADATA
 188         | FATTR4_WORD1_TIME_MODIFY,
 189 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 190         FATTR4_WORD2_SECURITY_LABEL
 191 #endif
 192 };
 193
 194 static const u32 nfs4_pnfs_open_bitmap[3] = {
 195         FATTR4_WORD0_TYPE
 196         | FATTR4_WORD0_CHANGE
 197         | FATTR4_WORD0_SIZE
 198         | FATTR4_WORD0_FSID
 199         | FATTR4_WORD0_FILEID,
 200         FATTR4_WORD1_MODE
 201         | FATTR4_WORD1_NUMLINKS
 202         | FATTR4_WORD1_OWNER
 203         | FATTR4_WORD1_OWNER_GROUP
 204         | FATTR4_WORD1_RAWDEV
 205         | FATTR4_WORD1_SPACE_USED
 206         | FATTR4_WORD1_TIME_ACCESS
 207         | FATTR4_WORD1_TIME_METADATA
 208         | FATTR4_WORD1_TIME_MODIFY,
 209         FATTR4_WORD2_MDSTHRESHOLD
 210 };
 211
 212 static const u32 nfs4_open_noattr_bitmap[3] = {
 213         FATTR4_WORD0_TYPE
 214         | FATTR4_WORD0_CHANGE
 215         | FATTR4_WORD0_FILEID,
 216 };
 217
 218 const u32 nfs4_statfs_bitmap[3] = {
 219         FATTR4_WORD0_FILES_AVAIL
 220         | FATTR4_WORD0_FILES_FREE
 221         | FATTR4_WORD0_FILES_TOTAL,
 222         FATTR4_WORD1_SPACE_AVAIL
 223         | FATTR4_WORD1_SPACE_FREE
 224         | FATTR4_WORD1_SPACE_TOTAL
 225 };
 226
 227 const u32 nfs4_pathconf_bitmap[3] = {
 228         FATTR4_WORD0_MAXLINK
 229         | FATTR4_WORD0_MAXNAME,
 230         0
 231 };
 232
 233 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 234                         | FATTR4_WORD0_MAXREAD
 235                         | FATTR4_WORD0_MAXWRITE
 236                         | FATTR4_WORD0_LEASE_TIME,
 237                         FATTR4_WORD1_TIME_DELTA
 238                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 239                         FATTR4_WORD2_LAYOUT_BLKSIZE
 240 };
 241
 242 const u32 nfs4_fs_locations_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_CHANGE
 245         | FATTR4_WORD0_SIZE
 246         | FATTR4_WORD0_FSID
 247         | FATTR4_WORD0_FILEID
 248         | FATTR4_WORD0_FS_LOCATIONS,
 249         FATTR4_WORD1_MODE
 250         | FATTR4_WORD1_NUMLINKS
 251         | FATTR4_WORD1_OWNER
 252         | FATTR4_WORD1_OWNER_GROUP
 253         | FATTR4_WORD1_RAWDEV
 254         | FATTR4_WORD1_SPACE_USED
 255         | FATTR4_WORD1_TIME_ACCESS
 256         | FATTR4_WORD1_TIME_METADATA
 257         | FATTR4_WORD1_TIME_MODIFY
 258         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 259 };
 260
 261 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 262                 struct nfs4_readdir_arg *readdir)
 263 {
 264         __be32 *start, *p;
 265
 266         if (cookie > 2) {
 267                 readdir->cookie = cookie;
 268                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 269                 return;
 270         }
 271
 272         readdir->cookie = 0;
 273         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 274         if (cookie == 2)
 275                 return;
 276
 277         /*
 278          * NFSv4 servers do not return entries for '.' and '..'
 279          * Therefore, we fake these entries here.  We let '.'
 280          * have cookie 0 and '..' have cookie 1.  Note that
 281          * when talking to the server, we always send cookie 0
 282          * instead of 1 or 2.
 283          */
 284         start = p = kmap_atomic(*readdir->pages);
 285
 286         if (cookie == 0) {
 287                 *p++ = xdr_one;                                  /* next */
 288                 *p++ = xdr_zero;                   /* cookie, first word */
 289                 *p++ = xdr_one;                   /* cookie, second word */
 290                 *p++ = xdr_one;                             /* entry len */
 291                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 292                 p++;
 293                 *p++ = xdr_one;                         /* bitmap length */
 294                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 295                 *p++ = htonl(8);              /* attribute buffer length */
 296                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 297         }
 298
 299         *p++ = xdr_one;                                  /* next */
 300         *p++ = xdr_zero;                   /* cookie, first word */
 301         *p++ = xdr_two;                   /* cookie, second word */
 302         *p++ = xdr_two;                             /* entry len */
 303         memcpy(p, "..\0\0", 4);                         /* entry */
 304         p++;
 305         *p++ = xdr_one;                         /* bitmap length */
 306         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 307         *p++ = htonl(8);              /* attribute buffer length */
 308         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 309
 310         readdir->pgbase = (char *)p - (char *)start;
 311         readdir->count -= readdir->pgbase;
 312         kunmap_atomic(start);
 313 }
 314
 315 static long nfs4_update_delay(long *timeout)
 316 {
 317         long ret;
 318         if (!timeout)
 319                 return NFS4_POLL_RETRY_MAX;
 320         if (*timeout <= 0)
 321                 *timeout = NFS4_POLL_RETRY_MIN;
 322         if (*timeout > NFS4_POLL_RETRY_MAX)
 323                 *timeout = NFS4_POLL_RETRY_MAX;
 324         ret = *timeout;
 325         *timeout <<= 1;
 326         return ret;
 327 }
 328
 329 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 330 {
 331         int res = 0;
 332
 333         might_sleep();
 334
 335         freezable_schedule_timeout_killable_unsafe(
 336                 nfs4_update_delay(timeout));
 337         if (fatal_signal_pending(current))
 338                 res = -ERESTARTSYS;
 339         return res;
 340 }
 341
 342 /* This is the error handling routine for processes that are allowed
 343  * to sleep.
 344  */
 345 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 346 {
 347         struct nfs_client *clp = server->nfs_client;
 348         struct nfs4_state *state = exception->state;
 349         struct inode *inode = exception->inode;
 350         int ret = errorcode;
 351
 352         exception->retry = 0;
 353         switch(errorcode) {
 354                 case 0:
 355                         return 0;
 356                 case -NFS4ERR_OPENMODE:
 357                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 358                                 nfs4_inode_return_delegation(inode);
 359                                 exception->retry = 1;
 360                                 return 0;
 361                         }
 362                         if (state == NULL)
 363                                 break;
 364                         ret = nfs4_schedule_stateid_recovery(server, state);
 365                         if (ret < 0)
 366                                 break;
 367                         goto wait_on_recovery;
 368                 case -NFS4ERR_DELEG_REVOKED:
 369                 case -NFS4ERR_ADMIN_REVOKED:
 370                 case -NFS4ERR_BAD_STATEID:
 371                         if (state == NULL)
 372                                 break;
 373                         ret = nfs4_schedule_stateid_recovery(server, state);
 374                         if (ret < 0)
 375                                 break;
 376                         goto wait_on_recovery;
 377                 case -NFS4ERR_EXPIRED:
 378                         if (state != NULL) {
 379                                 ret = nfs4_schedule_stateid_recovery(server, state);
 380                                 if (ret < 0)
 381                                         break;
 382                         }
 383                 case -NFS4ERR_STALE_STATEID:
 384                 case -NFS4ERR_STALE_CLIENTID:
 385                         nfs4_schedule_lease_recovery(clp);
 386                         goto wait_on_recovery;
 387                 case -NFS4ERR_MOVED:
 388                         ret = nfs4_schedule_migration_recovery(server);
 389                         if (ret < 0)
 390                                 break;
 391                         goto wait_on_recovery;
 392                 case -NFS4ERR_LEASE_MOVED:
 393                         nfs4_schedule_lease_moved_recovery(clp);
 394                         goto wait_on_recovery;
 395 #if defined(CONFIG_NFS_V4_1)
 396                 case -NFS4ERR_BADSESSION:
 397                 case -NFS4ERR_BADSLOT:
 398                 case -NFS4ERR_BAD_HIGH_SLOT:
 399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 400                 case -NFS4ERR_DEADSESSION:
 401                 case -NFS4ERR_SEQ_FALSE_RETRY:
 402                 case -NFS4ERR_SEQ_MISORDERED:
 403                         dprintk("%s ERROR: %d Reset session\n", __func__,
 404                                 errorcode);
 405                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 406                         goto wait_on_recovery;
 407 #endif /* defined(CONFIG_NFS_V4_1) */
 408                 case -NFS4ERR_FILE_OPEN:
 409                         if (exception->timeout > HZ) {
 410                                 /* We have retried a decent amount, time to
 411                                  * fail
 412                                  */
 413                                 ret = -EBUSY;
 414                                 break;
 415                         }
 416                 case -NFS4ERR_GRACE:
 417                 case -NFS4ERR_DELAY:
 418                         ret = nfs4_delay(server->client, &exception->timeout);
 419                         if (ret != 0)
 420                                 break;
 421                 case -NFS4ERR_RETRY_UNCACHED_REP:
 422                 case -NFS4ERR_OLD_STATEID:
 423                         exception->retry = 1;
 424                         break;
 425                 case -NFS4ERR_BADOWNER:
 426                         /* The following works around a Linux server bug! */
 427                 case -NFS4ERR_BADNAME:
 428                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 429                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 430                                 exception->retry = 1;
 431                                 printk(KERN_WARNING "NFS: v4 server %s "
 432                                                 "does not accept raw "
 433                                                 "uid/gids. "
 434                                                 "Reenabling the idmapper.\n",
 435                                                 server->nfs_client->cl_hostname);
 436                         }
 437         }
 438         /* We failed to handle the error */
 439         return nfs4_map_errors(ret);
 440 wait_on_recovery:
 441         ret = nfs4_wait_clnt_recover(clp);
 442         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 443                 return -EIO;
 444         if (ret == 0)
 445                 exception->retry = 1;
 446         return ret;
 447 }
 448
 449 /*
 450  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 451  * or 'false' otherwise.
 452  */
 453 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 454 {
 455         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 456
 457         if (flavor == RPC_AUTH_GSS_KRB5I ||
 458             flavor == RPC_AUTH_GSS_KRB5P)
 459                 return true;
 460
 461         return false;
 462 }
 463
 464 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 465 {
 466         spin_lock(&clp->cl_lock);
 467         if (time_before(clp->cl_last_renewal,timestamp))
 468                 clp->cl_last_renewal = timestamp;
 469         spin_unlock(&clp->cl_lock);
 470 }
 471
 472 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 473 {
 474         do_renew_lease(server->nfs_client, timestamp);
 475 }
 476
 477 struct nfs4_call_sync_data {
 478         const struct nfs_server *seq_server;
 479         struct nfs4_sequence_args *seq_args;
 480         struct nfs4_sequence_res *seq_res;
 481 };
 482
 483 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 484                                struct nfs4_sequence_res *res, int cache_reply)
 485 {
 486         args->sa_slot = NULL;
 487         args->sa_cache_this = cache_reply;
 488         args->sa_privileged = 0;
 489
 490         res->sr_slot = NULL;
 491 }
 492
 493 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 494 {
 495         args->sa_privileged = 1;
 496 }
 497
 498 static int nfs40_setup_sequence(const struct nfs_server *server,
 499                                 struct nfs4_sequence_args *args,
 500                                 struct nfs4_sequence_res *res,
 501                                 struct rpc_task *task)
 502 {
 503         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 504         struct nfs4_slot *slot;
 505
 506         /* slot already allocated? */
 507         if (res->sr_slot != NULL)
 508                 goto out_start;
 509
 510         spin_lock(&tbl->slot_tbl_lock);
 511         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 512                 goto out_sleep;
 513
 514         slot = nfs4_alloc_slot(tbl);
 515         if (IS_ERR(slot)) {
 516                 if (slot == ERR_PTR(-ENOMEM))
 517                         task->tk_timeout = HZ >> 2;
 518                 goto out_sleep;
 519         }
 520         spin_unlock(&tbl->slot_tbl_lock);
 521
 522         args->sa_slot = slot;
 523         res->sr_slot = slot;
 524
 525 out_start:
 526         rpc_call_start(task);
 527         return 0;
 528
 529 out_sleep:
 530         if (args->sa_privileged)
 531                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 532                                 NULL, RPC_PRIORITY_PRIVILEGED);
 533         else
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535         spin_unlock(&tbl->slot_tbl_lock);
 536         return -EAGAIN;
 537 }
 538
 539 static int nfs40_sequence_done(struct rpc_task *task,
 540                                struct nfs4_sequence_res *res)
 541 {
 542         struct nfs4_slot *slot = res->sr_slot;
 543         struct nfs4_slot_table *tbl;
 544
 545         if (slot == NULL)
 546                 goto out;
 547
 548         tbl = slot->table;
 549         spin_lock(&tbl->slot_tbl_lock);
 550         if (!nfs41_wake_and_assign_slot(tbl, slot))
 551                 nfs4_free_slot(tbl, slot);
 552         spin_unlock(&tbl->slot_tbl_lock);
 553
 554         res->sr_slot = NULL;
 555 out:
 556         return 1;
 557 }
 558
 559 #if defined(CONFIG_NFS_V4_1)
 560
 561 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 562 {
 563         struct nfs4_session *session;
 564         struct nfs4_slot_table *tbl;
 565         struct nfs4_slot *slot = res->sr_slot;
 566         bool send_new_highest_used_slotid = false;
 567
 568         tbl = slot->table;
 569         session = tbl->session;
 570
 571         spin_lock(&tbl->slot_tbl_lock);
 572         /* Be nice to the server: try to ensure that the last transmitted
 573          * value for highest_user_slotid <= target_highest_slotid
 574          */
 575         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 576                 send_new_highest_used_slotid = true;
 577
 578         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 579                 send_new_highest_used_slotid = false;
 580                 goto out_unlock;
 581         }
 582         nfs4_free_slot(tbl, slot);
 583
 584         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 585                 send_new_highest_used_slotid = false;
 586 out_unlock:
 587         spin_unlock(&tbl->slot_tbl_lock);
 588         res->sr_slot = NULL;
 589         if (send_new_highest_used_slotid)
 590                 nfs41_server_notify_highest_slotid_update(session->clp);
 591 }
 592
 593 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 594 {
 595         struct nfs4_session *session;
 596         struct nfs4_slot *slot = res->sr_slot;
 597         struct nfs_client *clp;
 598         bool interrupted = false;
 599         int ret = 1;
 600
 601         if (slot == NULL)
 602                 goto out_noaction;
 603         /* don't increment the sequence number if the task wasn't sent */
 604         if (!RPC_WAS_SENT(task))
 605                 goto out;
 606
 607         session = slot->table->session;
 608
 609         if (slot->interrupted) {
 610                 slot->interrupted = 0;
 611                 interrupted = true;
 612         }
 613
 614         trace_nfs4_sequence_done(session, res);
 615         /* Check the SEQUENCE operation status */
 616         switch (res->sr_status) {
 617         case 0:
 618                 /* Update the slot's sequence and clientid lease timer */
 619                 ++slot->seq_nr;
 620                 clp = session->clp;
 621                 do_renew_lease(clp, res->sr_timestamp);
 622                 /* Check sequence flags */
 623                 if (res->sr_status_flags != 0)
 624                         nfs4_schedule_lease_recovery(clp);
 625                 nfs41_update_target_slotid(slot->table, slot, res);
 626                 break;
 627         case 1:
 628                 /*
 629                  * sr_status remains 1 if an RPC level error occurred.
 630                  * The server may or may not have processed the sequence
 631                  * operation..
 632                  * Mark the slot as having hosted an interrupted RPC call.
 633                  */
 634                 slot->interrupted = 1;
 635                 goto out;
 636         case -NFS4ERR_DELAY:
 637                 /* The server detected a resend of the RPC call and
 638                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 639                  * of RFC5661.
 640                  */
 641                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 642                         __func__,
 643                         slot->slot_nr,
 644                         slot->seq_nr);
 645                 goto out_retry;
 646         case -NFS4ERR_BADSLOT:
 647                 /*
 648                  * The slot id we used was probably retired. Try again
 649                  * using a different slot id.
 650                  */
 651                 goto retry_nowait;
 652         case -NFS4ERR_SEQ_MISORDERED:
 653                 /*
 654                  * Was the last operation on this sequence interrupted?
 655                  * If so, retry after bumping the sequence number.
 656                  */
 657                 if (interrupted) {
 658                         ++slot->seq_nr;
 659                         goto retry_nowait;
 660                 }
 661                 /*
 662                  * Could this slot have been previously retired?
 663                  * If so, then the server may be expecting seq_nr = 1!
 664                  */
 665                 if (slot->seq_nr != 1) {
 666                         slot->seq_nr = 1;
 667                         goto retry_nowait;
 668                 }
 669                 break;
 670         case -NFS4ERR_SEQ_FALSE_RETRY:
 671                 ++slot->seq_nr;
 672                 goto retry_nowait;
 673         default:
 674                 /* Just update the slot sequence no. */
 675                 ++slot->seq_nr;
 676         }
 677 out:
 678         /* The session may be reset by one of the error handlers. */
 679         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 680         nfs41_sequence_free_slot(res);
 681 out_noaction:
 682         return ret;
 683 retry_nowait:
 684         if (rpc_restart_call_prepare(task)) {
 685                 task->tk_status = 0;
 686                 ret = 0;
 687         }
 688         goto out;
 689 out_retry:
 690         if (!rpc_restart_call(task))
 691                 goto out;
 692         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 693         return 0;
 694 }
 695 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 696
 697 static int nfs4_sequence_done(struct rpc_task *task,
 698                                struct nfs4_sequence_res *res)
 699 {
 700         if (res->sr_slot == NULL)
 701                 return 1;
 702         if (!res->sr_slot->table->session)
 703                 return nfs40_sequence_done(task, res);
 704         return nfs41_sequence_done(task, res);
 705 }
 706
 707 int nfs41_setup_sequence(struct nfs4_session *session,
 708                                 struct nfs4_sequence_args *args,
 709                                 struct nfs4_sequence_res *res,
 710                                 struct rpc_task *task)
 711 {
 712         struct nfs4_slot *slot;
 713         struct nfs4_slot_table *tbl;
 714
 715         dprintk("--> %s\n", __func__);
 716         /* slot already allocated? */
 717         if (res->sr_slot != NULL)
 718                 goto out_success;
 719
 720         tbl = &session->fc_slot_table;
 721
 722         task->tk_timeout = 0;
 723
 724         spin_lock(&tbl->slot_tbl_lock);
 725         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 726             !args->sa_privileged) {
 727                 /* The state manager will wait until the slot table is empty */
 728                 dprintk("%s session is draining\n", __func__);
 729                 goto out_sleep;
 730         }
 731
 732         slot = nfs4_alloc_slot(tbl);
 733         if (IS_ERR(slot)) {
 734                 /* If out of memory, try again in 1/4 second */
 735                 if (slot == ERR_PTR(-ENOMEM))
 736                         task->tk_timeout = HZ >> 2;
 737                 dprintk("<-- %s: no free slots\n", __func__);
 738                 goto out_sleep;
 739         }
 740         spin_unlock(&tbl->slot_tbl_lock);
 741
 742         args->sa_slot = slot;
 743
 744         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 745                         slot->slot_nr, slot->seq_nr);
 746
 747         res->sr_slot = slot;
 748         res->sr_timestamp = jiffies;
 749         res->sr_status_flags = 0;
 750         /*
 751          * sr_status is only set in decode_sequence, and so will remain
 752          * set to 1 if an rpc level failure occurs.
 753          */
 754         res->sr_status = 1;
 755         trace_nfs4_setup_sequence(session, args);
 756 out_success:
 757         rpc_call_start(task);
 758         return 0;
 759 out_sleep:
 760         /* Privileged tasks are queued with top priority */
 761         if (args->sa_privileged)
 762                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 763                                 NULL, RPC_PRIORITY_PRIVILEGED);
 764         else
 765                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 766         spin_unlock(&tbl->slot_tbl_lock);
 767         return -EAGAIN;
 768 }
 769 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 770
 771 static int nfs4_setup_sequence(const struct nfs_server *server,
 772                                struct nfs4_sequence_args *args,
 773                                struct nfs4_sequence_res *res,
 774                                struct rpc_task *task)
 775 {
 776         struct nfs4_session *session = nfs4_get_session(server);
 777         int ret = 0;
 778
 779         if (!session)
 780                 return nfs40_setup_sequence(server, args, res, task);
 781
 782         dprintk("--> %s clp %p session %p sr_slot %u\n",
 783                 __func__, session->clp, session, res->sr_slot ?
 784                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 785
 786         ret = nfs41_setup_sequence(session, args, res, task);
 787
 788         dprintk("<-- %s status=%d\n", __func__, ret);
 789         return ret;
 790 }
 791
 792 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 793 {
 794         struct nfs4_call_sync_data *data = calldata;
 795         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 796
 797         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 798
 799         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 800 }
 801
 802 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 803 {
 804         struct nfs4_call_sync_data *data = calldata;
 805
 806         nfs41_sequence_done(task, data->seq_res);
 807 }
 808
 809 static const struct rpc_call_ops nfs41_call_sync_ops = {
 810         .rpc_call_prepare = nfs41_call_sync_prepare,
 811         .rpc_call_done = nfs41_call_sync_done,
 812 };
 813
 814 #else   /* !CONFIG_NFS_V4_1 */
 815
 816 static int nfs4_setup_sequence(const struct nfs_server *server,
 817                                struct nfs4_sequence_args *args,
 818                                struct nfs4_sequence_res *res,
 819                                struct rpc_task *task)
 820 {
 821         return nfs40_setup_sequence(server, args, res, task);
 822 }
 823
 824 static int nfs4_sequence_done(struct rpc_task *task,
 825                                struct nfs4_sequence_res *res)
 826 {
 827         return nfs40_sequence_done(task, res);
 828 }
 829
 830 #endif  /* !CONFIG_NFS_V4_1 */
 831
 832 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 833 {
 834         struct nfs4_call_sync_data *data = calldata;
 835         nfs4_setup_sequence(data->seq_server,
 836                                 data->seq_args, data->seq_res, task);
 837 }
 838
 839 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_call_sync_data *data = calldata;
 842         nfs4_sequence_done(task, data->seq_res);
 843 }
 844
 845 static const struct rpc_call_ops nfs40_call_sync_ops = {
 846         .rpc_call_prepare = nfs40_call_sync_prepare,
 847         .rpc_call_done = nfs40_call_sync_done,
 848 };
 849
 850 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 851                                    struct nfs_server *server,
 852                                    struct rpc_message *msg,
 853                                    struct nfs4_sequence_args *args,
 854                                    struct nfs4_sequence_res *res)
 855 {
 856         int ret;
 857         struct rpc_task *task;
 858         struct nfs_client *clp = server->nfs_client;
 859         struct nfs4_call_sync_data data = {
 860                 .seq_server = server,
 861                 .seq_args = args,
 862                 .seq_res = res,
 863         };
 864         struct rpc_task_setup task_setup = {
 865                 .rpc_client = clnt,
 866                 .rpc_message = msg,
 867                 .callback_ops = clp->cl_mvops->call_sync_ops,
 868                 .callback_data = &data
 869         };
 870
 871         task = rpc_run_task(&task_setup);
 872         if (IS_ERR(task))
 873                 ret = PTR_ERR(task);
 874         else {
 875                 ret = task->tk_status;
 876                 rpc_put_task(task);
 877         }
 878         return ret;
 879 }
 880
 881 int nfs4_call_sync(struct rpc_clnt *clnt,
 882                    struct nfs_server *server,
 883                    struct rpc_message *msg,
 884                    struct nfs4_sequence_args *args,
 885                    struct nfs4_sequence_res *res,
 886                    int cache_reply)
 887 {
 888         nfs4_init_sequence(args, res, cache_reply);
 889         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 890 }
 891
 892 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 893 {
 894         struct nfs_inode *nfsi = NFS_I(dir);
 895
 896         spin_lock(&dir->i_lock);
 897         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 898         if (!cinfo->atomic || cinfo->before != dir->i_version)
 899                 nfs_force_lookup_revalidate(dir);
 900         dir->i_version = cinfo->after;
 901         nfs_fscache_invalidate(dir);
 902         spin_unlock(&dir->i_lock);
 903 }
 904
 905 struct nfs4_opendata {
 906         struct kref kref;
 907         struct nfs_openargs o_arg;
 908         struct nfs_openres o_res;
 909         struct nfs_open_confirmargs c_arg;
 910         struct nfs_open_confirmres c_res;
 911         struct nfs4_string owner_name;
 912         struct nfs4_string group_name;
 913         struct nfs_fattr f_attr;
 914         struct nfs4_label *f_label;
 915         struct dentry *dir;
 916         struct dentry *dentry;
 917         struct nfs4_state_owner *owner;
 918         struct nfs4_state *state;
 919         struct iattr attrs;
 920         unsigned long timestamp;
 921         unsigned int rpc_done : 1;
 922         unsigned int file_created : 1;
 923         unsigned int is_recover : 1;
 924         int rpc_status;
 925         int cancelled;
 926 };
 927
 928 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 929                 int err, struct nfs4_exception *exception)
 930 {
 931         if (err != -EINVAL)
 932                 return false;
 933         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 934                 return false;
 935         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 936         exception->retry = 1;
 937         return true;
 938 }
 939
 940 static enum open_claim_type4
 941 nfs4_map_atomic_open_claim(struct nfs_server *server,
 942                 enum open_claim_type4 claim)
 943 {
 944         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 945                 return claim;
 946         switch (claim) {
 947         default:
 948                 return claim;
 949         case NFS4_OPEN_CLAIM_FH:
 950                 return NFS4_OPEN_CLAIM_NULL;
 951         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 953         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 954                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 955         }
 956 }
 957
 958 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 959 {
 960         p->o_res.f_attr = &p->f_attr;
 961         p->o_res.f_label = p->f_label;
 962         p->o_res.seqid = p->o_arg.seqid;
 963         p->c_res.seqid = p->c_arg.seqid;
 964         p->o_res.server = p->o_arg.server;
 965         p->o_res.access_request = p->o_arg.access;
 966         nfs_fattr_init(&p->f_attr);
 967         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 968 }
 969
 970 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 971                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 972                 const struct iattr *attrs,
 973                 struct nfs4_label *label,
 974                 enum open_claim_type4 claim,
 975                 gfp_t gfp_mask)
 976 {
 977         struct dentry *parent = dget_parent(dentry);
 978         struct inode *dir = parent->d_inode;
 979         struct nfs_server *server = NFS_SERVER(dir);
 980         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
 981         struct nfs4_opendata *p;
 982
 983         p = kzalloc(sizeof(*p), gfp_mask);
 984         if (p == NULL)
 985                 goto err;
 986
 987         p->f_label = nfs4_label_alloc(server, gfp_mask);
 988         if (IS_ERR(p->f_label))
 989                 goto err_free_p;
 990
 991         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
 992         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
 993         if (IS_ERR(p->o_arg.seqid))
 994                 goto err_free_label;
 995         nfs_sb_active(dentry->d_sb);
 996         p->dentry = dget(dentry);
 997         p->dir = parent;
 998         p->owner = sp;
 999         atomic_inc(&sp->so_count);
1000         p->o_arg.open_flags = flags;
1001         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1002         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1003          * will return permission denied for all bits until close */
1004         if (!(flags & O_EXCL)) {
1005                 /* ask server to check for all possible rights as results
1006                  * are cached */
1007                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1008                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1009         }
1010         p->o_arg.clientid = server->nfs_client->cl_clientid;
1011         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1012         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1013         p->o_arg.name = &dentry->d_name;
1014         p->o_arg.server = server;
1015         p->o_arg.bitmask = nfs4_bitmask(server, label);
1016         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1017         p->o_arg.label = label;
1018         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1019         switch (p->o_arg.claim) {
1020         case NFS4_OPEN_CLAIM_NULL:
1021         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1022         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1023                 p->o_arg.fh = NFS_FH(dir);
1024                 break;
1025         case NFS4_OPEN_CLAIM_PREVIOUS:
1026         case NFS4_OPEN_CLAIM_FH:
1027         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1028         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1029                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1030         }
1031         if (attrs != NULL && attrs->ia_valid != 0) {
1032                 __u32 verf[2];
1033
1034                 p->o_arg.u.attrs = &p->attrs;
1035                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1036
1037                 verf[0] = jiffies;
1038                 verf[1] = current->pid;
1039                 memcpy(p->o_arg.u.verifier.data, verf,
1040                                 sizeof(p->o_arg.u.verifier.data));
1041         }
1042         p->c_arg.fh = &p->o_res.fh;
1043         p->c_arg.stateid = &p->o_res.stateid;
1044         p->c_arg.seqid = p->o_arg.seqid;
1045         nfs4_init_opendata_res(p);
1046         kref_init(&p->kref);
1047         return p;
1048
1049 err_free_label:
1050         nfs4_label_free(p->f_label);
1051 err_free_p:
1052         kfree(p);
1053 err:
1054         dput(parent);
1055         return NULL;
1056 }
1057
1058 static void nfs4_opendata_free(struct kref *kref)
1059 {
1060         struct nfs4_opendata *p = container_of(kref,
1061                         struct nfs4_opendata, kref);
1062         struct super_block *sb = p->dentry->d_sb;
1063
1064         nfs_free_seqid(p->o_arg.seqid);
1065         if (p->state != NULL)
1066                 nfs4_put_open_state(p->state);
1067         nfs4_put_state_owner(p->owner);
1068
1069         nfs4_label_free(p->f_label);
1070
1071         dput(p->dir);
1072         dput(p->dentry);
1073         nfs_sb_deactive(sb);
1074         nfs_fattr_free_names(&p->f_attr);
1075         kfree(p->f_attr.mdsthreshold);
1076         kfree(p);
1077 }
1078
1079 static void nfs4_opendata_put(struct nfs4_opendata *p)
1080 {
1081         if (p != NULL)
1082                 kref_put(&p->kref, nfs4_opendata_free);
1083 }
1084
1085 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1086 {
1087         int ret;
1088
1089         ret = rpc_wait_for_completion_task(task);
1090         return ret;
1091 }
1092
1093 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1094 {
1095         int ret = 0;
1096
1097         if (open_mode & (O_EXCL|O_TRUNC))
1098                 goto out;
1099         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1100                 case FMODE_READ:
1101                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1102                                 && state->n_rdonly != 0;
1103                         break;
1104                 case FMODE_WRITE:
1105                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1106                                 && state->n_wronly != 0;
1107                         break;
1108                 case FMODE_READ|FMODE_WRITE:
1109                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1110                                 && state->n_rdwr != 0;
1111         }
1112 out:
1113         return ret;
1114 }
1115
1116 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1117 {
1118         if (delegation == NULL)
1119                 return 0;
1120         if ((delegation->type & fmode) != fmode)
1121                 return 0;
1122         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1123                 return 0;
1124         nfs_mark_delegation_referenced(delegation);
1125         return 1;
1126 }
1127
1128 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1129 {
1130         switch (fmode) {
1131                 case FMODE_WRITE:
1132                         state->n_wronly++;
1133                         break;
1134                 case FMODE_READ:
1135                         state->n_rdonly++;
1136                         break;
1137                 case FMODE_READ|FMODE_WRITE:
1138                         state->n_rdwr++;
1139         }
1140         nfs4_state_set_mode_locked(state, state->state | fmode);
1141 }
1142
1143 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1144 {
1145         struct nfs_client *clp = state->owner->so_server->nfs_client;
1146         bool need_recover = false;
1147
1148         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1149                 need_recover = true;
1150         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1151                 need_recover = true;
1152         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1153                 need_recover = true;
1154         if (need_recover)
1155                 nfs4_state_mark_reclaim_nograce(clp, state);
1156 }
1157
1158 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1159                 nfs4_stateid *stateid)
1160 {
1161         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1162                 return true;
1163         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1164                 nfs_test_and_clear_all_open_stateid(state);
1165                 return true;
1166         }
1167         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1168                 return true;
1169         return false;
1170 }
1171
1172 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1173 {
1174         if (state->n_wronly)
1175                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1176         if (state->n_rdonly)
1177                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1178         if (state->n_rdwr)
1179                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1180 }
1181
1182 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1183                 nfs4_stateid *stateid, fmode_t fmode)
1184 {
1185         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1186         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1187         case FMODE_WRITE:
1188                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1189                 break;
1190         case FMODE_READ:
1191                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1192                 break;
1193         case 0:
1194                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1195                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1196                 clear_bit(NFS_OPEN_STATE, &state->flags);
1197         }
1198         if (stateid == NULL)
1199                 return;
1200         /* Handle races with OPEN */
1201         if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1202             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1203                 nfs_resync_open_stateid_locked(state);
1204                 return;
1205         }
1206         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1207                 nfs4_stateid_copy(&state->stateid, stateid);
1208         nfs4_stateid_copy(&state->open_stateid, stateid);
1209 }
1210
1211 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1212 {
1213         write_seqlock(&state->seqlock);
1214         nfs_clear_open_stateid_locked(state, stateid, fmode);
1215         write_sequnlock(&state->seqlock);
1216         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1217                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1218 }
1219
1220 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1221 {
1222         switch (fmode) {
1223                 case FMODE_READ:
1224                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1225                         break;
1226                 case FMODE_WRITE:
1227                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1228                         break;
1229                 case FMODE_READ|FMODE_WRITE:
1230                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1231         }
1232         if (!nfs_need_update_open_stateid(state, stateid))
1233                 return;
1234         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1235                 nfs4_stateid_copy(&state->stateid, stateid);
1236         nfs4_stateid_copy(&state->open_stateid, stateid);
1237 }
1238
1239 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1240 {
1241         /*
1242          * Protect the call to nfs4_state_set_mode_locked and
1243          * serialise the stateid update
1244          */
1245         write_seqlock(&state->seqlock);
1246         if (deleg_stateid != NULL) {
1247                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1248                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1249         }
1250         if (open_stateid != NULL)
1251                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1252         write_sequnlock(&state->seqlock);
1253         spin_lock(&state->owner->so_lock);
1254         update_open_stateflags(state, fmode);
1255         spin_unlock(&state->owner->so_lock);
1256 }
1257
1258 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1259 {
1260         struct nfs_inode *nfsi = NFS_I(state->inode);
1261         struct nfs_delegation *deleg_cur;
1262         int ret = 0;
1263
1264         fmode &= (FMODE_READ|FMODE_WRITE);
1265
1266         rcu_read_lock();
1267         deleg_cur = rcu_dereference(nfsi->delegation);
1268         if (deleg_cur == NULL)
1269                 goto no_delegation;
1270
1271         spin_lock(&deleg_cur->lock);
1272         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1273            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1274             (deleg_cur->type & fmode) != fmode)
1275                 goto no_delegation_unlock;
1276
1277         if (delegation == NULL)
1278                 delegation = &deleg_cur->stateid;
1279         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1280                 goto no_delegation_unlock;
1281
1282         nfs_mark_delegation_referenced(deleg_cur);
1283         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1284         ret = 1;
1285 no_delegation_unlock:
1286         spin_unlock(&deleg_cur->lock);
1287 no_delegation:
1288         rcu_read_unlock();
1289
1290         if (!ret && open_stateid != NULL) {
1291                 __update_open_stateid(state, open_stateid, NULL, fmode);
1292                 ret = 1;
1293         }
1294         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1295                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1296
1297         return ret;
1298 }
1299
1300
1301 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1302 {
1303         struct nfs_delegation *delegation;
1304
1305         rcu_read_lock();
1306         delegation = rcu_dereference(NFS_I(inode)->delegation);
1307         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1308                 rcu_read_unlock();
1309                 return;
1310         }
1311         rcu_read_unlock();
1312         nfs4_inode_return_delegation(inode);
1313 }
1314
1315 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1316 {
1317         struct nfs4_state *state = opendata->state;
1318         struct nfs_inode *nfsi = NFS_I(state->inode);
1319         struct nfs_delegation *delegation;
1320         int open_mode = opendata->o_arg.open_flags;
1321         fmode_t fmode = opendata->o_arg.fmode;
1322         nfs4_stateid stateid;
1323         int ret = -EAGAIN;
1324
1325         for (;;) {
1326                 spin_lock(&state->owner->so_lock);
1327                 if (can_open_cached(state, fmode, open_mode)) {
1328                         update_open_stateflags(state, fmode);
1329                         spin_unlock(&state->owner->so_lock);
1330                         goto out_return_state;
1331                 }
1332                 spin_unlock(&state->owner->so_lock);
1333                 rcu_read_lock();
1334                 delegation = rcu_dereference(nfsi->delegation);
1335                 if (!can_open_delegated(delegation, fmode)) {
1336                         rcu_read_unlock();
1337                         break;
1338                 }
1339                 /* Save the delegation */
1340                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1341                 rcu_read_unlock();
1342                 nfs_release_seqid(opendata->o_arg.seqid);
1343                 if (!opendata->is_recover) {
1344                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1345                         if (ret != 0)
1346                                 goto out;
1347                 }
1348                 ret = -EAGAIN;
1349
1350                 /* Try to update the stateid using the delegation */
1351                 if (update_open_stateid(state, NULL, &stateid, fmode))
1352                         goto out_return_state;
1353         }
1354 out:
1355         return ERR_PTR(ret);
1356 out_return_state:
1357         atomic_inc(&state->count);
1358         return state;
1359 }
1360
1361 static void
1362 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1363 {
1364         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1365         struct nfs_delegation *delegation;
1366         int delegation_flags = 0;
1367
1368         rcu_read_lock();
1369         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1370         if (delegation)
1371                 delegation_flags = delegation->flags;
1372         rcu_read_unlock();
1373         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1374                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1375                                    "returning a delegation for "
1376                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1377                                    clp->cl_hostname);
1378         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1379                 nfs_inode_set_delegation(state->inode,
1380                                          data->owner->so_cred,
1381                                          &data->o_res);
1382         else
1383                 nfs_inode_reclaim_delegation(state->inode,
1384                                              data->owner->so_cred,
1385                                              &data->o_res);
1386 }
1387
1388 /*
1389  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1390  * and update the nfs4_state.
1391  */
1392 static struct nfs4_state *
1393 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1394 {
1395         struct inode *inode = data->state->inode;
1396         struct nfs4_state *state = data->state;
1397         int ret;
1398
1399         if (!data->rpc_done) {
1400                 if (data->rpc_status) {
1401                         ret = data->rpc_status;
1402                         goto err;
1403                 }
1404                 /* cached opens have already been processed */
1405                 goto update;
1406         }
1407
1408         ret = nfs_refresh_inode(inode, &data->f_attr);
1409         if (ret)
1410                 goto err;
1411
1412         if (data->o_res.delegation_type != 0)
1413                 nfs4_opendata_check_deleg(data, state);
1414 update:
1415         update_open_stateid(state, &data->o_res.stateid, NULL,
1416                             data->o_arg.fmode);
1417         atomic_inc(&state->count);
1418
1419         return state;
1420 err:
1421         return ERR_PTR(ret);
1422
1423 }
1424
1425 static struct nfs4_state *
1426 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1427 {
1428         struct inode *inode;
1429         struct nfs4_state *state = NULL;
1430         int ret;
1431
1432         if (!data->rpc_done) {
1433                 state = nfs4_try_open_cached(data);
1434                 goto out;
1435         }
1436
1437         ret = -EAGAIN;
1438         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1439                 goto err;
1440         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1441         ret = PTR_ERR(inode);
1442         if (IS_ERR(inode))
1443                 goto err;
1444         ret = -ENOMEM;
1445         state = nfs4_get_open_state(inode, data->owner);
1446         if (state == NULL)
1447                 goto err_put_inode;
1448         if (data->o_res.delegation_type != 0)
1449                 nfs4_opendata_check_deleg(data, state);
1450         update_open_stateid(state, &data->o_res.stateid, NULL,
1451                         data->o_arg.fmode);
1452         iput(inode);
1453 out:
1454         nfs_release_seqid(data->o_arg.seqid);
1455         return state;
1456 err_put_inode:
1457         iput(inode);
1458 err:
1459         return ERR_PTR(ret);
1460 }
1461
1462 static struct nfs4_state *
1463 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1464 {
1465         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1466                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1467         return _nfs4_opendata_to_nfs4_state(data);
1468 }
1469
1470 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1471 {
1472         struct nfs_inode *nfsi = NFS_I(state->inode);
1473         struct nfs_open_context *ctx;
1474
1475         spin_lock(&state->inode->i_lock);
1476         list_for_each_entry(ctx, &nfsi->open_files, list) {
1477                 if (ctx->state != state)
1478                         continue;
1479                 get_nfs_open_context(ctx);
1480                 spin_unlock(&state->inode->i_lock);
1481                 return ctx;
1482         }
1483         spin_unlock(&state->inode->i_lock);
1484         return ERR_PTR(-ENOENT);
1485 }
1486
1487 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1488                 struct nfs4_state *state, enum open_claim_type4 claim)
1489 {
1490         struct nfs4_opendata *opendata;
1491
1492         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1493                         NULL, NULL, claim, GFP_NOFS);
1494         if (opendata == NULL)
1495                 return ERR_PTR(-ENOMEM);
1496         opendata->state = state;
1497         atomic_inc(&state->count);
1498         return opendata;
1499 }
1500
1501 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1502 {
1503         struct nfs4_state *newstate;
1504         int ret;
1505
1506         opendata->o_arg.open_flags = 0;
1507         opendata->o_arg.fmode = fmode;
1508         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1509         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1510         nfs4_init_opendata_res(opendata);
1511         ret = _nfs4_recover_proc_open(opendata);
1512         if (ret != 0)
1513                 return ret;
1514         newstate = nfs4_opendata_to_nfs4_state(opendata);
1515         if (IS_ERR(newstate))
1516                 return PTR_ERR(newstate);
1517         nfs4_close_state(newstate, fmode);
1518         *res = newstate;
1519         return 0;
1520 }
1521
1522 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1523 {
1524         struct nfs4_state *newstate;
1525         int ret;
1526
1527         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1528         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1529         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1530         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1531         /* memory barrier prior to reading state->n_* */
1532         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1533         clear_bit(NFS_OPEN_STATE, &state->flags);
1534         smp_rmb();
1535         if (state->n_rdwr != 0) {
1536                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1537                 if (ret != 0)
1538                         return ret;
1539                 if (newstate != state)
1540                         return -ESTALE;
1541         }
1542         if (state->n_wronly != 0) {
1543                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1544                 if (ret != 0)
1545                         return ret;
1546                 if (newstate != state)
1547                         return -ESTALE;
1548         }
1549         if (state->n_rdonly != 0) {
1550                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1551                 if (ret != 0)
1552                         return ret;
1553                 if (newstate != state)
1554                         return -ESTALE;
1555         }
1556         /*
1557          * We may have performed cached opens for all three recoveries.
1558          * Check if we need to update the current stateid.
1559          */
1560         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1561             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1562                 write_seqlock(&state->seqlock);
1563                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1564                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1565                 write_sequnlock(&state->seqlock);
1566         }
1567         return 0;
1568 }
1569
1570 /*
1571  * OPEN_RECLAIM:
1572  *      reclaim state on the server after a reboot.
1573  */
1574 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1575 {
1576         struct nfs_delegation *delegation;
1577         struct nfs4_opendata *opendata;
1578         fmode_t delegation_type = 0;
1579         int status;
1580
1581         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1582                         NFS4_OPEN_CLAIM_PREVIOUS);
1583         if (IS_ERR(opendata))
1584                 return PTR_ERR(opendata);
1585         rcu_read_lock();
1586         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1587         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1588                 delegation_type = delegation->type;
1589         rcu_read_unlock();
1590         opendata->o_arg.u.delegation_type = delegation_type;
1591         status = nfs4_open_recover(opendata, state);
1592         nfs4_opendata_put(opendata);
1593         return status;
1594 }
1595
1596 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1597 {
1598         struct nfs_server *server = NFS_SERVER(state->inode);
1599         struct nfs4_exception exception = { };
1600         int err;
1601         do {
1602                 err = _nfs4_do_open_reclaim(ctx, state);
1603                 trace_nfs4_open_reclaim(ctx, 0, err);
1604                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1605                         continue;
1606                 if (err != -NFS4ERR_DELAY)
1607                         break;
1608                 nfs4_handle_exception(server, err, &exception);
1609         } while (exception.retry);
1610         return err;
1611 }
1612
1613 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1614 {
1615         struct nfs_open_context *ctx;
1616         int ret;
1617
1618         ctx = nfs4_state_find_open_context(state);
1619         if (IS_ERR(ctx))
1620                 return -EAGAIN;
1621         ret = nfs4_do_open_reclaim(ctx, state);
1622         put_nfs_open_context(ctx);
1623         return ret;
1624 }
1625
1626 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1627 {
1628         switch (err) {
1629                 default:
1630                         printk(KERN_ERR "NFS: %s: unhandled error "
1631                                         "%d.\n", __func__, err);
1632                 case 0:
1633                 case -ENOENT:
1634                 case -ESTALE:
1635                         break;
1636                 case -NFS4ERR_BADSESSION:
1637                 case -NFS4ERR_BADSLOT:
1638                 case -NFS4ERR_BAD_HIGH_SLOT:
1639                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1640                 case -NFS4ERR_DEADSESSION:
1641                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1642                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1643                         return -EAGAIN;
1644                 case -NFS4ERR_STALE_CLIENTID:
1645                 case -NFS4ERR_STALE_STATEID:
1646                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1647                 case -NFS4ERR_EXPIRED:
1648                         /* Don't recall a delegation if it was lost */
1649                         nfs4_schedule_lease_recovery(server->nfs_client);
1650                         return -EAGAIN;
1651                 case -NFS4ERR_MOVED:
1652                         nfs4_schedule_migration_recovery(server);
1653                         return -EAGAIN;
1654                 case -NFS4ERR_LEASE_MOVED:
1655                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1656                         return -EAGAIN;
1657                 case -NFS4ERR_DELEG_REVOKED:
1658                 case -NFS4ERR_ADMIN_REVOKED:
1659                 case -NFS4ERR_BAD_STATEID:
1660                 case -NFS4ERR_OPENMODE:
1661                         nfs_inode_find_state_and_recover(state->inode,
1662                                         stateid);
1663                         nfs4_schedule_stateid_recovery(server, state);
1664                         return -EAGAIN;
1665                 case -NFS4ERR_DELAY:
1666                 case -NFS4ERR_GRACE:
1667                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1668                         ssleep(1);
1669                         return -EAGAIN;
1670                 case -ENOMEM:
1671                 case -NFS4ERR_DENIED:
1672                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1673                         return 0;
1674         }
1675         return err;
1676 }
1677
1678 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1679 {
1680         struct nfs_server *server = NFS_SERVER(state->inode);
1681         struct nfs4_opendata *opendata;
1682         int err;
1683
1684         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1685                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1686         if (IS_ERR(opendata))
1687                 return PTR_ERR(opendata);
1688         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1689         err = nfs4_open_recover(opendata, state);
1690         nfs4_opendata_put(opendata);
1691         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1692 }
1693
1694 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1695 {
1696         struct nfs4_opendata *data = calldata;
1697
1698         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1699                                 &data->c_res.seq_res, task);
1700 }
1701
1702 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1703 {
1704         struct nfs4_opendata *data = calldata;
1705
1706         nfs40_sequence_done(task, &data->c_res.seq_res);
1707
1708         data->rpc_status = task->tk_status;
1709         if (data->rpc_status == 0) {
1710                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1711                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1712                 renew_lease(data->o_res.server, data->timestamp);
1713                 data->rpc_done = 1;
1714         }
1715 }
1716
1717 static void nfs4_open_confirm_release(void *calldata)
1718 {
1719         struct nfs4_opendata *data = calldata;
1720         struct nfs4_state *state = NULL;
1721
1722         /* If this request hasn't been cancelled, do nothing */
1723         if (data->cancelled == 0)
1724                 goto out_free;
1725         /* In case of error, no cleanup! */
1726         if (!data->rpc_done)
1727                 goto out_free;
1728         state = nfs4_opendata_to_nfs4_state(data);
1729         if (!IS_ERR(state))
1730                 nfs4_close_state(state, data->o_arg.fmode);
1731 out_free:
1732         nfs4_opendata_put(data);
1733 }
1734
1735 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1736         .rpc_call_prepare = nfs4_open_confirm_prepare,
1737         .rpc_call_done = nfs4_open_confirm_done,
1738         .rpc_release = nfs4_open_confirm_release,
1739 };
1740
1741 /*
1742  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1743  */
1744 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1745 {
1746         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1747         struct rpc_task *task;
1748         struct  rpc_message msg = {
1749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1750                 .rpc_argp = &data->c_arg,
1751                 .rpc_resp = &data->c_res,
1752                 .rpc_cred = data->owner->so_cred,
1753         };
1754         struct rpc_task_setup task_setup_data = {
1755                 .rpc_client = server->client,
1756                 .rpc_message = &msg,
1757                 .callback_ops = &nfs4_open_confirm_ops,
1758                 .callback_data = data,
1759                 .workqueue = nfsiod_workqueue,
1760                 .flags = RPC_TASK_ASYNC,
1761         };
1762         int status;
1763
1764         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1765         kref_get(&data->kref);
1766         data->rpc_done = 0;
1767         data->rpc_status = 0;
1768         data->timestamp = jiffies;
1769         task = rpc_run_task(&task_setup_data);
1770         if (IS_ERR(task))
1771                 return PTR_ERR(task);
1772         status = nfs4_wait_for_completion_rpc_task(task);
1773         if (status != 0) {
1774                 data->cancelled = 1;
1775                 smp_wmb();
1776         } else
1777                 status = data->rpc_status;
1778         rpc_put_task(task);
1779         return status;
1780 }
1781
1782 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1783 {
1784         struct nfs4_opendata *data = calldata;
1785         struct nfs4_state_owner *sp = data->owner;
1786         struct nfs_client *clp = sp->so_server->nfs_client;
1787
1788         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1789                 goto out_wait;
1790         /*
1791          * Check if we still need to send an OPEN call, or if we can use
1792          * a delegation instead.
1793          */
1794         if (data->state != NULL) {
1795                 struct nfs_delegation *delegation;
1796
1797                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1798                         goto out_no_action;
1799                 rcu_read_lock();
1800                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1801                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1802                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1803                     can_open_delegated(delegation, data->o_arg.fmode))
1804                         goto unlock_no_action;
1805                 rcu_read_unlock();
1806         }
1807         /* Update client id. */
1808         data->o_arg.clientid = clp->cl_clientid;
1809         switch (data->o_arg.claim) {
1810         case NFS4_OPEN_CLAIM_PREVIOUS:
1811         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1812         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1813                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1814         case NFS4_OPEN_CLAIM_FH:
1815                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1816                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1817         }
1818         data->timestamp = jiffies;
1819         if (nfs4_setup_sequence(data->o_arg.server,
1820                                 &data->o_arg.seq_args,
1821                                 &data->o_res.seq_res,
1822                                 task) != 0)
1823                 nfs_release_seqid(data->o_arg.seqid);
1824
1825         /* Set the create mode (note dependency on the session type) */
1826         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1827         if (data->o_arg.open_flags & O_EXCL) {
1828                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1829                 if (nfs4_has_persistent_session(clp))
1830                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1831                 else if (clp->cl_mvops->minor_version > 0)
1832                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1833         }
1834         return;
1835 unlock_no_action:
1836         rcu_read_unlock();
1837 out_no_action:
1838         task->tk_action = NULL;
1839 out_wait:
1840         nfs4_sequence_done(task, &data->o_res.seq_res);
1841 }
1842
1843 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1844 {
1845         struct nfs4_opendata *data = calldata;
1846
1847         data->rpc_status = task->tk_status;
1848
1849         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1850                 return;
1851
1852         if (task->tk_status == 0) {
1853                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1854                         switch (data->o_res.f_attr->mode & S_IFMT) {
1855                         case S_IFREG:
1856                                 break;
1857                         case S_IFLNK:
1858                                 data->rpc_status = -ELOOP;
1859                                 break;
1860                         case S_IFDIR:
1861                                 data->rpc_status = -EISDIR;
1862                                 break;
1863                         default:
1864                                 data->rpc_status = -ENOTDIR;
1865                         }
1866                 }
1867                 renew_lease(data->o_res.server, data->timestamp);
1868                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1869                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1870         }
1871         data->rpc_done = 1;
1872 }
1873
1874 static void nfs4_open_release(void *calldata)
1875 {
1876         struct nfs4_opendata *data = calldata;
1877         struct nfs4_state *state = NULL;
1878
1879         /* If this request hasn't been cancelled, do nothing */
1880         if (data->cancelled == 0)
1881                 goto out_free;
1882         /* In case of error, no cleanup! */
1883         if (data->rpc_status != 0 || !data->rpc_done)
1884                 goto out_free;
1885         /* In case we need an open_confirm, no cleanup! */
1886         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1887                 goto out_free;
1888         state = nfs4_opendata_to_nfs4_state(data);
1889         if (!IS_ERR(state))
1890                 nfs4_close_state(state, data->o_arg.fmode);
1891 out_free:
1892         nfs4_opendata_put(data);
1893 }
1894
1895 static const struct rpc_call_ops nfs4_open_ops = {
1896         .rpc_call_prepare = nfs4_open_prepare,
1897         .rpc_call_done = nfs4_open_done,
1898         .rpc_release = nfs4_open_release,
1899 };
1900
1901 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1902 {
1903         struct inode *dir = data->dir->d_inode;
1904         struct nfs_server *server = NFS_SERVER(dir);
1905         struct nfs_openargs *o_arg = &data->o_arg;
1906         struct nfs_openres *o_res = &data->o_res;
1907         struct rpc_task *task;
1908         struct rpc_message msg = {
1909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1910                 .rpc_argp = o_arg,
1911                 .rpc_resp = o_res,
1912                 .rpc_cred = data->owner->so_cred,
1913         };
1914         struct rpc_task_setup task_setup_data = {
1915                 .rpc_client = server->client,
1916                 .rpc_message = &msg,
1917                 .callback_ops = &nfs4_open_ops,
1918                 .callback_data = data,
1919                 .workqueue = nfsiod_workqueue,
1920                 .flags = RPC_TASK_ASYNC,
1921         };
1922         int status;
1923
1924         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1925         kref_get(&data->kref);
1926         data->rpc_done = 0;
1927         data->rpc_status = 0;
1928         data->cancelled = 0;
1929         data->is_recover = 0;
1930         if (isrecover) {
1931                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1932                 data->is_recover = 1;
1933         }
1934         task = rpc_run_task(&task_setup_data);
1935         if (IS_ERR(task))
1936                 return PTR_ERR(task);
1937         status = nfs4_wait_for_completion_rpc_task(task);
1938         if (status != 0) {
1939                 data->cancelled = 1;
1940                 smp_wmb();
1941         } else
1942                 status = data->rpc_status;
1943         rpc_put_task(task);
1944
1945         return status;
1946 }
1947
1948 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1949 {
1950         struct inode *dir = data->dir->d_inode;
1951         struct nfs_openres *o_res = &data->o_res;
1952         int status;
1953
1954         status = nfs4_run_open_task(data, 1);
1955         if (status != 0 || !data->rpc_done)
1956                 return status;
1957
1958         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1959
1960         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1961                 status = _nfs4_proc_open_confirm(data);
1962                 if (status != 0)
1963                         return status;
1964         }
1965
1966         return status;
1967 }
1968
1969 /*
1970  * Additional permission checks in order to distinguish between an
1971  * open for read, and an open for execute. This works around the
1972  * fact that NFSv4 OPEN treats read and execute permissions as being
1973  * the same.
1974  * Note that in the non-execute case, we want to turn off permission
1975  * checking if we just created a new file (POSIX open() semantics).
1976  */
1977 static int nfs4_opendata_access(struct rpc_cred *cred,
1978                                 struct nfs4_opendata *opendata,
1979                                 struct nfs4_state *state, fmode_t fmode,
1980                                 int openflags)
1981 {
1982         struct nfs_access_entry cache;
1983         u32 mask;
1984
1985         /* access call failed or for some reason the server doesn't
1986          * support any access modes -- defer access call until later */
1987         if (opendata->o_res.access_supported == 0)
1988                 return 0;
1989
1990         mask = 0;
1991         /*
1992          * Use openflags to check for exec, because fmode won't
1993          * always have FMODE_EXEC set when file open for exec.
1994          */
1995         if (openflags & __FMODE_EXEC) {
1996                 /* ONLY check for exec rights */
1997                 mask = MAY_EXEC;
1998         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1999                 mask = MAY_READ;
2000
2001         cache.cred = cred;
2002         cache.jiffies = jiffies;
2003         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2004         nfs_access_add_cache(state->inode, &cache);
2005
2006         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2007                 return 0;
2008
2009         /* even though OPEN succeeded, access is denied. Close the file */
2010         nfs4_close_state(state, fmode);
2011         return -EACCES;
2012 }
2013
2014 /*
2015  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2016  */
2017 static int _nfs4_proc_open(struct nfs4_opendata *data)
2018 {
2019         struct inode *dir = data->dir->d_inode;
2020         struct nfs_server *server = NFS_SERVER(dir);
2021         struct nfs_openargs *o_arg = &data->o_arg;
2022         struct nfs_openres *o_res = &data->o_res;
2023         int status;
2024
2025         status = nfs4_run_open_task(data, 0);
2026         if (!data->rpc_done)
2027                 return status;
2028         if (status != 0) {
2029                 if (status == -NFS4ERR_BADNAME &&
2030                                 !(o_arg->open_flags & O_CREAT))
2031                         return -ENOENT;
2032                 return status;
2033         }
2034
2035         nfs_fattr_map_and_free_names(server, &data->f_attr);
2036
2037         if (o_arg->open_flags & O_CREAT) {
2038                 update_changeattr(dir, &o_res->cinfo);
2039                 if (o_arg->open_flags & O_EXCL)
2040                         data->file_created = 1;
2041                 else if (o_res->cinfo.before != o_res->cinfo.after)
2042                         data->file_created = 1;
2043         }
2044         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2045                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2046         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2047                 status = _nfs4_proc_open_confirm(data);
2048                 if (status != 0)
2049                         return status;
2050         }
2051         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2052                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2053         return 0;
2054 }
2055
2056 static int nfs4_recover_expired_lease(struct nfs_server *server)
2057 {
2058         return nfs4_client_recover_expired_lease(server->nfs_client);
2059 }
2060
2061 /*
2062  * OPEN_EXPIRED:
2063  *      reclaim state on the server after a network partition.
2064  *      Assumes caller holds the appropriate lock
2065  */
2066 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2067 {
2068         struct nfs4_opendata *opendata;
2069         int ret;
2070
2071         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2072                         NFS4_OPEN_CLAIM_FH);
2073         if (IS_ERR(opendata))
2074                 return PTR_ERR(opendata);
2075         ret = nfs4_open_recover(opendata, state);
2076         if (ret == -ESTALE)
2077                 d_drop(ctx->dentry);
2078         nfs4_opendata_put(opendata);
2079         return ret;
2080 }
2081
2082 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2083 {
2084         struct nfs_server *server = NFS_SERVER(state->inode);
2085         struct nfs4_exception exception = { };
2086         int err;
2087
2088         do {
2089                 err = _nfs4_open_expired(ctx, state);
2090                 trace_nfs4_open_expired(ctx, 0, err);
2091                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2092                         continue;
2093                 switch (err) {
2094                 default:
2095                         goto out;
2096                 case -NFS4ERR_GRACE:
2097                 case -NFS4ERR_DELAY:
2098                         nfs4_handle_exception(server, err, &exception);
2099                         err = 0;
2100                 }
2101         } while (exception.retry);
2102 out:
2103         return err;
2104 }
2105
2106 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2107 {
2108         struct nfs_open_context *ctx;
2109         int ret;
2110
2111         ctx = nfs4_state_find_open_context(state);
2112         if (IS_ERR(ctx))
2113                 return -EAGAIN;
2114         ret = nfs4_do_open_expired(ctx, state);
2115         put_nfs_open_context(ctx);
2116         return ret;
2117 }
2118
2119 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2120 {
2121         nfs_remove_bad_delegation(state->inode);
2122         write_seqlock(&state->seqlock);
2123         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2124         write_sequnlock(&state->seqlock);
2125         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2126 }
2127
2128 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2129 {
2130         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2131                 nfs_finish_clear_delegation_stateid(state);
2132 }
2133
2134 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2135 {
2136         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2137         nfs40_clear_delegation_stateid(state);
2138         return nfs4_open_expired(sp, state);
2139 }
2140
2141 #if defined(CONFIG_NFS_V4_1)
2142 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2143 {
2144         struct nfs_server *server = NFS_SERVER(state->inode);
2145         nfs4_stateid stateid;
2146         struct nfs_delegation *delegation;
2147         struct rpc_cred *cred;
2148         int status;
2149
2150         /* Get the delegation credential for use by test/free_stateid */
2151         rcu_read_lock();
2152         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2153         if (delegation == NULL) {
2154                 rcu_read_unlock();
2155                 return;
2156         }
2157
2158         nfs4_stateid_copy(&stateid, &delegation->stateid);
2159         cred = get_rpccred(delegation->cred);
2160         rcu_read_unlock();
2161         status = nfs41_test_stateid(server, &stateid, cred);
2162         trace_nfs4_test_delegation_stateid(state, NULL, status);
2163
2164         if (status != NFS_OK) {
2165                 /* Free the stateid unless the server explicitly
2166                  * informs us the stateid is unrecognized. */
2167                 if (status != -NFS4ERR_BAD_STATEID)
2168                         nfs41_free_stateid(server, &stateid, cred);
2169                 nfs_finish_clear_delegation_stateid(state);
2170         }
2171
2172         put_rpccred(cred);
2173 }
2174
2175 /**
2176  * nfs41_check_open_stateid - possibly free an open stateid
2177  *
2178  * @state: NFSv4 state for an inode
2179  *
2180  * Returns NFS_OK if recovery for this stateid is now finished.
2181  * Otherwise a negative NFS4ERR value is returned.
2182  */
2183 static int nfs41_check_open_stateid(struct nfs4_state *state)
2184 {
2185         struct nfs_server *server = NFS_SERVER(state->inode);
2186         nfs4_stateid *stateid = &state->open_stateid;
2187         struct rpc_cred *cred = state->owner->so_cred;
2188         int status;
2189
2190         /* If a state reset has been done, test_stateid is unneeded */
2191         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2192             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2193             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2194                 return -NFS4ERR_BAD_STATEID;
2195
2196         status = nfs41_test_stateid(server, stateid, cred);
2197         trace_nfs4_test_open_stateid(state, NULL, status);
2198         if (status != NFS_OK) {
2199                 /* Free the stateid unless the server explicitly
2200                  * informs us the stateid is unrecognized. */
2201                 if (status != -NFS4ERR_BAD_STATEID)
2202                         nfs41_free_stateid(server, stateid, cred);
2203
2204                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2205                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2206                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2207                 clear_bit(NFS_OPEN_STATE, &state->flags);
2208         }
2209         return status;
2210 }
2211
2212 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2213 {
2214         int status;
2215
2216         nfs41_check_delegation_stateid(state);
2217         status = nfs41_check_open_stateid(state);
2218         if (status != NFS_OK)
2219                 status = nfs4_open_expired(sp, state);
2220         return status;
2221 }
2222 #endif
2223
2224 /*
2225  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2226  * fields corresponding to attributes that were used to store the verifier.
2227  * Make sure we clobber those fields in the later setattr call
2228  */
2229 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2230 {
2231         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2232             !(sattr->ia_valid & ATTR_ATIME_SET))
2233                 sattr->ia_valid |= ATTR_ATIME;
2234
2235         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2236             !(sattr->ia_valid & ATTR_MTIME_SET))
2237                 sattr->ia_valid |= ATTR_MTIME;
2238 }
2239
2240 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2241                 fmode_t fmode,
2242                 int flags,
2243                 struct nfs_open_context *ctx)
2244 {
2245         struct nfs4_state_owner *sp = opendata->owner;
2246         struct nfs_server *server = sp->so_server;
2247         struct dentry *dentry;
2248         struct nfs4_state *state;
2249         unsigned int seq;
2250         int ret;
2251
2252         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2253
2254         ret = _nfs4_proc_open(opendata);
2255         if (ret != 0)
2256                 goto out;
2257
2258         state = nfs4_opendata_to_nfs4_state(opendata);
2259         ret = PTR_ERR(state);
2260         if (IS_ERR(state))
2261                 goto out;
2262         if (server->caps & NFS_CAP_POSIX_LOCK)
2263                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2264
2265         dentry = opendata->dentry;
2266         if (dentry->d_inode == NULL) {
2267                 /* FIXME: Is this d_drop() ever needed? */
2268                 d_drop(dentry);
2269                 dentry = d_add_unique(dentry, igrab(state->inode));
2270                 if (dentry == NULL) {
2271                         dentry = opendata->dentry;
2272                 } else if (dentry != ctx->dentry) {
2273                         dput(ctx->dentry);
2274                         ctx->dentry = dget(dentry);
2275                 }
2276                 nfs_set_verifier(dentry,
2277                                 nfs_save_change_attribute(opendata->dir->d_inode));
2278         }
2279
2280         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2281         if (ret != 0)
2282                 goto out;
2283
2284         ctx->state = state;
2285         if (dentry->d_inode == state->inode) {
2286                 nfs_inode_attach_open_context(ctx);
2287                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2288                         nfs4_schedule_stateid_recovery(server, state);
2289         }
2290 out:
2291         return ret;
2292 }
2293
2294 /*
2295  * Returns a referenced nfs4_state
2296  */
2297 static int _nfs4_do_open(struct inode *dir,
2298                         struct nfs_open_context *ctx,
2299                         int flags,
2300                         struct iattr *sattr,
2301                         struct nfs4_label *label,
2302                         int *opened)
2303 {
2304         struct nfs4_state_owner  *sp;
2305         struct nfs4_state     *state = NULL;
2306         struct nfs_server       *server = NFS_SERVER(dir);
2307         struct nfs4_opendata *opendata;
2308         struct dentry *dentry = ctx->dentry;
2309         struct rpc_cred *cred = ctx->cred;
2310         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2311         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2312         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2313         struct nfs4_label *olabel = NULL;
2314         int status;
2315
2316         /* Protect against reboot recovery conflicts */
2317         status = -ENOMEM;
2318         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2319         if (sp == NULL) {
2320                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2321                 goto out_err;
2322         }
2323         status = nfs4_recover_expired_lease(server);
2324         if (status != 0)
2325                 goto err_put_state_owner;
2326         if (dentry->d_inode != NULL)
2327                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2328         status = -ENOMEM;
2329         if (dentry->d_inode)
2330                 claim = NFS4_OPEN_CLAIM_FH;
2331         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2332                         label, claim, GFP_KERNEL);
2333         if (opendata == NULL)
2334                 goto err_put_state_owner;
2335
2336         if (label) {
2337                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2338                 if (IS_ERR(olabel)) {
2339                         status = PTR_ERR(olabel);
2340                         goto err_opendata_put;
2341                 }
2342         }
2343
2344         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2345                 if (!opendata->f_attr.mdsthreshold) {
2346                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2347                         if (!opendata->f_attr.mdsthreshold)
2348                                 goto err_free_label;
2349                 }
2350                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2351         }
2352         if (dentry->d_inode != NULL)
2353                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2354
2355         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2356         if (status != 0)
2357                 goto err_free_label;
2358         state = ctx->state;
2359
2360         if ((opendata->o_arg.open_flags & O_EXCL) &&
2361             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2362                 nfs4_exclusive_attrset(opendata, sattr);
2363
2364                 nfs_fattr_init(opendata->o_res.f_attr);
2365                 status = nfs4_do_setattr(state->inode, cred,
2366                                 opendata->o_res.f_attr, sattr,
2367                                 state, label, olabel);
2368                 if (status == 0) {
2369                         nfs_setattr_update_inode(state->inode, sattr);
2370                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2371                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2372                 }
2373         }
2374         if (opendata->file_created)
2375                 *opened |= FILE_CREATED;
2376
2377         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2378                 *ctx_th = opendata->f_attr.mdsthreshold;
2379                 opendata->f_attr.mdsthreshold = NULL;
2380         }
2381
2382         nfs4_label_free(olabel);
2383
2384         nfs4_opendata_put(opendata);
2385         nfs4_put_state_owner(sp);
2386         return 0;
2387 err_free_label:
2388         nfs4_label_free(olabel);
2389 err_opendata_put:
2390         nfs4_opendata_put(opendata);
2391 err_put_state_owner:
2392         nfs4_put_state_owner(sp);
2393 out_err:
2394         return status;
2395 }
2396
2397
2398 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2399                                         struct nfs_open_context *ctx,
2400                                         int flags,
2401                                         struct iattr *sattr,
2402                                         struct nfs4_label *label,
2403                                         int *opened)
2404 {
2405         struct nfs_server *server = NFS_SERVER(dir);
2406         struct nfs4_exception exception = { };
2407         struct nfs4_state *res;
2408         int status;
2409
2410         do {
2411                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2412                 res = ctx->state;
2413                 trace_nfs4_open_file(ctx, flags, status);
2414                 if (status == 0)
2415                         break;
2416                 /* NOTE: BAD_SEQID means the server and client disagree about the
2417                  * book-keeping w.r.t. state-changing operations
2418                  * (OPEN/CLOSE/LOCK/LOCKU...)
2419                  * It is actually a sign of a bug on the client or on the server.
2420                  *
2421                  * If we receive a BAD_SEQID error in the particular case of
2422                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2423                  * have unhashed the old state_owner for us, and that we can
2424                  * therefore safely retry using a new one. We should still warn
2425                  * the user though...
2426                  */
2427                 if (status == -NFS4ERR_BAD_SEQID) {
2428                         pr_warn_ratelimited("NFS: v4 server %s "
2429                                         " returned a bad sequence-id error!\n",
2430                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2431                         exception.retry = 1;
2432                         continue;
2433                 }
2434                 /*
2435                  * BAD_STATEID on OPEN means that the server cancelled our
2436                  * state before it received the OPEN_CONFIRM.
2437                  * Recover by retrying the request as per the discussion
2438                  * on Page 181 of RFC3530.
2439                  */
2440                 if (status == -NFS4ERR_BAD_STATEID) {
2441                         exception.retry = 1;
2442                         continue;
2443                 }
2444                 if (status == -EAGAIN) {
2445                         /* We must have found a delegation */
2446                         exception.retry = 1;
2447                         continue;
2448                 }
2449                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2450                         continue;
2451                 res = ERR_PTR(nfs4_handle_exception(server,
2452                                         status, &exception));
2453         } while (exception.retry);
2454         return res;
2455 }
2456
2457 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2458                             struct nfs_fattr *fattr, struct iattr *sattr,
2459                             struct nfs4_state *state, struct nfs4_label *ilabel,
2460                             struct nfs4_label *olabel)
2461 {
2462         struct nfs_server *server = NFS_SERVER(inode);
2463         struct nfs_setattrargs  arg = {
2464                 .fh             = NFS_FH(inode),
2465                 .iap            = sattr,
2466                 .server         = server,
2467                 .bitmask = server->attr_bitmask,
2468                 .label          = ilabel,
2469         };
2470         struct nfs_setattrres  res = {
2471                 .fattr          = fattr,
2472                 .label          = olabel,
2473                 .server         = server,
2474         };
2475         struct rpc_message msg = {
2476                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2477                 .rpc_argp       = &arg,
2478                 .rpc_resp       = &res,
2479                 .rpc_cred       = cred,
2480         };
2481         unsigned long timestamp = jiffies;
2482         fmode_t fmode;
2483         bool truncate;
2484         int status;
2485
2486         arg.bitmask = nfs4_bitmask(server, ilabel);
2487         if (ilabel)
2488                 arg.bitmask = nfs4_bitmask(server, olabel);
2489
2490         nfs_fattr_init(fattr);
2491
2492         /* Servers should only apply open mode checks for file size changes */
2493         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2494         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2495
2496         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2497                 /* Use that stateid */
2498         } else if (truncate && state != NULL) {
2499                 struct nfs_lockowner lockowner = {
2500                         .l_owner = current->files,
2501                         .l_pid = current->tgid,
2502                 };
2503                 if (!nfs4_valid_open_stateid(state))
2504                         return -EBADF;
2505                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2506                                 &lockowner) == -EIO)
2507                         return -EBADF;
2508         } else
2509                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2510
2511         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2512         if (status == 0 && state != NULL)
2513                 renew_lease(server, timestamp);
2514         return status;
2515 }
2516
2517 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2518                            struct nfs_fattr *fattr, struct iattr *sattr,
2519                            struct nfs4_state *state, struct nfs4_label *ilabel,
2520                            struct nfs4_label *olabel)
2521 {
2522         struct nfs_server *server = NFS_SERVER(inode);
2523         struct nfs4_exception exception = {
2524                 .state = state,
2525                 .inode = inode,
2526         };
2527         int err;
2528         do {
2529                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2530                 trace_nfs4_setattr(inode, err);
2531                 switch (err) {
2532                 case -NFS4ERR_OPENMODE:
2533                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2534                                 pr_warn_once("NFSv4: server %s is incorrectly "
2535                                                 "applying open mode checks to "
2536                                                 "a SETATTR that is not "
2537                                                 "changing file size.\n",
2538                                                 server->nfs_client->cl_hostname);
2539                         }
2540                         if (state && !(state->state & FMODE_WRITE)) {
2541                                 err = -EBADF;
2542                                 if (sattr->ia_valid & ATTR_OPEN)
2543                                         err = -EACCES;
2544                                 goto out;
2545                         }
2546                 }
2547                 err = nfs4_handle_exception(server, err, &exception);
2548         } while (exception.retry);
2549 out:
2550         return err;
2551 }
2552
2553 struct nfs4_closedata {
2554         struct inode *inode;
2555         struct nfs4_state *state;
2556         struct nfs_closeargs arg;
2557         struct nfs_closeres res;
2558         struct nfs_fattr fattr;
2559         unsigned long timestamp;
2560         bool roc;
2561         u32 roc_barrier;
2562 };
2563
2564 static void nfs4_free_closedata(void *data)
2565 {
2566         struct nfs4_closedata *calldata = data;
2567         struct nfs4_state_owner *sp = calldata->state->owner;
2568         struct super_block *sb = calldata->state->inode->i_sb;
2569
2570         if (calldata->roc)
2571                 pnfs_roc_release(calldata->state->inode);
2572         nfs4_put_open_state(calldata->state);
2573         nfs_free_seqid(calldata->arg.seqid);
2574         nfs4_put_state_owner(sp);
2575         nfs_sb_deactive(sb);
2576         kfree(calldata);
2577 }
2578
2579 static void nfs4_close_done(struct rpc_task *task, void *data)
2580 {
2581         struct nfs4_closedata *calldata = data;
2582         struct nfs4_state *state = calldata->state;
2583         struct nfs_server *server = NFS_SERVER(calldata->inode);
2584         nfs4_stateid *res_stateid = NULL;
2585
2586         dprintk("%s: begin!\n", __func__);
2587         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2588                 return;
2589         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2590         /* hmm. we are done with the inode, and in the process of freeing
2591          * the state_owner. we keep this around to process errors
2592          */
2593         switch (task->tk_status) {
2594                 case 0:
2595                         res_stateid = &calldata->res.stateid;
2596                         if (calldata->arg.fmode == 0 && calldata->roc)
2597                                 pnfs_roc_set_barrier(state->inode,
2598                                                      calldata->roc_barrier);
2599                         renew_lease(server, calldata->timestamp);
2600                         break;
2601                 case -NFS4ERR_ADMIN_REVOKED:
2602                 case -NFS4ERR_STALE_STATEID:
2603                 case -NFS4ERR_OLD_STATEID:
2604                 case -NFS4ERR_BAD_STATEID:
2605                 case -NFS4ERR_EXPIRED:
2606                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2607                                                 &state->stateid)) {
2608                                 rpc_restart_call_prepare(task);
2609                                 goto out_release;
2610                         }
2611                         if (calldata->arg.fmode == 0)
2612                                 break;
2613                 default:
2614                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2615                                 rpc_restart_call_prepare(task);
2616                                 goto out_release;
2617                         }
2618         }
2619         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2620 out_release:
2621         nfs_release_seqid(calldata->arg.seqid);
2622         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2623         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2624 }
2625
2626 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2627 {
2628         struct nfs4_closedata *calldata = data;
2629         struct nfs4_state *state = calldata->state;
2630         struct inode *inode = calldata->inode;
2631         bool is_rdonly, is_wronly, is_rdwr;
2632         int call_close = 0;
2633
2634         dprintk("%s: begin!\n", __func__);
2635         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2636                 goto out_wait;
2637
2638         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2639         spin_lock(&state->owner->so_lock);
2640         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2641         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2642         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2643         nfs4_stateid_copy(&calldata->arg.stateid, &state->stateid);
2644         /* Calculate the change in open mode */
2645         calldata->arg.fmode = 0;
2646         if (state->n_rdwr == 0) {
2647                 if (state->n_rdonly == 0)
2648                         call_close |= is_rdonly;
2649                 else if (is_rdonly)
2650                         calldata->arg.fmode |= FMODE_READ;
2651                 if (state->n_wronly == 0)
2652                         call_close |= is_wronly;
2653                 else if (is_wronly)
2654                         calldata->arg.fmode |= FMODE_WRITE;
2655         } else if (is_rdwr)
2656                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2657
2658         if (calldata->arg.fmode == 0)
2659                 call_close |= is_rdwr;
2660
2661         if (!nfs4_valid_open_stateid(state))
2662                 call_close = 0;
2663         spin_unlock(&state->owner->so_lock);
2664
2665         if (!call_close) {
2666                 /* Note: exit _without_ calling nfs4_close_done */
2667                 goto out_no_action;
2668         }
2669
2670         if (calldata->arg.fmode == 0) {
2671                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2672                 if (calldata->roc &&
2673                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2674                         nfs_release_seqid(calldata->arg.seqid);
2675                         goto out_wait;
2676                     }
2677         }
2678
2679         nfs_fattr_init(calldata->res.fattr);
2680         calldata->timestamp = jiffies;
2681         if (nfs4_setup_sequence(NFS_SERVER(inode),
2682                                 &calldata->arg.seq_args,
2683                                 &calldata->res.seq_res,
2684                                 task) != 0)
2685                 nfs_release_seqid(calldata->arg.seqid);
2686         dprintk("%s: done!\n", __func__);
2687         return;
2688 out_no_action:
2689         task->tk_action = NULL;
2690 out_wait:
2691         nfs4_sequence_done(task, &calldata->res.seq_res);
2692 }
2693
2694 static const struct rpc_call_ops nfs4_close_ops = {
2695         .rpc_call_prepare = nfs4_close_prepare,
2696         .rpc_call_done = nfs4_close_done,
2697         .rpc_release = nfs4_free_closedata,
2698 };
2699
2700 static bool nfs4_state_has_opener(struct nfs4_state *state)
2701 {
2702         /* first check existing openers */
2703         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2704             state->n_rdonly != 0)
2705                 return true;
2706
2707         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2708             state->n_wronly != 0)
2709                 return true;
2710
2711         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2712             state->n_rdwr != 0)
2713                 return true;
2714
2715         return false;
2716 }
2717
2718 static bool nfs4_roc(struct inode *inode)
2719 {
2720         struct nfs_inode *nfsi = NFS_I(inode);
2721         struct nfs_open_context *ctx;
2722         struct nfs4_state *state;
2723
2724         spin_lock(&inode->i_lock);
2725         list_for_each_entry(ctx, &nfsi->open_files, list) {
2726                 state = ctx->state;
2727                 if (state == NULL)
2728                         continue;
2729                 if (nfs4_state_has_opener(state)) {
2730                         spin_unlock(&inode->i_lock);
2731                         return false;
2732                 }
2733         }
2734         spin_unlock(&inode->i_lock);
2735
2736         if (nfs4_check_delegation(inode, FMODE_READ))
2737                 return false;
2738
2739         return pnfs_roc(inode);
2740 }
2741
2742 /*
2743  * It is possible for data to be read/written from a mem-mapped file
2744  * after the sys_close call (which hits the vfs layer as a flush).
2745  * This means that we can't safely call nfsv4 close on a file until
2746  * the inode is cleared. This in turn means that we are not good
2747  * NFSv4 citizens - we do not indicate to the server to update the file's
2748  * share state even when we are done with one of the three share
2749  * stateid's in the inode.
2750  *
2751  * NOTE: Caller must be holding the sp->so_owner semaphore!
2752  */
2753 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2754 {
2755         struct nfs_server *server = NFS_SERVER(state->inode);
2756         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2757         struct nfs4_closedata *calldata;
2758         struct nfs4_state_owner *sp = state->owner;
2759         struct rpc_task *task;
2760         struct rpc_message msg = {
2761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2762                 .rpc_cred = state->owner->so_cred,
2763         };
2764         struct rpc_task_setup task_setup_data = {
2765                 .rpc_client = server->client,
2766                 .rpc_message = &msg,
2767                 .callback_ops = &nfs4_close_ops,
2768                 .workqueue = nfsiod_workqueue,
2769                 .flags = RPC_TASK_ASYNC,
2770         };
2771         int status = -ENOMEM;
2772
2773         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2774                 &task_setup_data.rpc_client, &msg);
2775
2776         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2777         if (calldata == NULL)
2778                 goto out;
2779         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2780         calldata->inode = state->inode;
2781         calldata->state = state;
2782         calldata->arg.fh = NFS_FH(state->inode);
2783         /* Serialization for the sequence id */
2784         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2785         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2786         if (IS_ERR(calldata->arg.seqid))
2787                 goto out_free_calldata;
2788         calldata->arg.fmode = 0;
2789         calldata->arg.bitmask = server->cache_consistency_bitmask;
2790         calldata->res.fattr = &calldata->fattr;
2791         calldata->res.seqid = calldata->arg.seqid;
2792         calldata->res.server = server;
2793         calldata->roc = nfs4_roc(state->inode);
2794         nfs_sb_active(calldata->inode->i_sb);
2795
2796         msg.rpc_argp = &calldata->arg;
2797         msg.rpc_resp = &calldata->res;
2798         task_setup_data.callback_data = calldata;
2799         task = rpc_run_task(&task_setup_data);
2800         if (IS_ERR(task))
2801                 return PTR_ERR(task);
2802         status = 0;
2803         if (wait)
2804                 status = rpc_wait_for_completion_task(task);
2805         rpc_put_task(task);
2806         return status;
2807 out_free_calldata:
2808         kfree(calldata);
2809 out:
2810         nfs4_put_open_state(state);
2811         nfs4_put_state_owner(sp);
2812         return status;
2813 }
2814
2815 static struct inode *
2816 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2817                 int open_flags, struct iattr *attr, int *opened)
2818 {
2819         struct nfs4_state *state;
2820         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2821
2822         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2823
2824         /* Protect against concurrent sillydeletes */
2825         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2826
2827         nfs4_label_release_security(label);
2828
2829         if (IS_ERR(state))
2830                 return ERR_CAST(state);
2831         return state->inode;
2832 }
2833
2834 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2835 {
2836         if (ctx->state == NULL)
2837                 return;
2838         if (is_sync)
2839                 nfs4_close_sync(ctx->state, ctx->mode);
2840         else
2841                 nfs4_close_state(ctx->state, ctx->mode);
2842 }
2843
2844 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2845 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2846 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2847
2848 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2849 {
2850         struct nfs4_server_caps_arg args = {
2851                 .fhandle = fhandle,
2852         };
2853         struct nfs4_server_caps_res res = {};
2854         struct rpc_message msg = {
2855                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2856                 .rpc_argp = &args,
2857                 .rpc_resp = &res,
2858         };
2859         int status;
2860
2861         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2862         if (status == 0) {
2863                 /* Sanity check the server answers */
2864                 switch (server->nfs_client->cl_minorversion) {
2865                 case 0:
2866                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2867                         res.attr_bitmask[2] = 0;
2868                         break;
2869                 case 1:
2870                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2871                         break;
2872                 case 2:
2873                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2874                 }
2875                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2876                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2877                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2878                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2879                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2880                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2881                                 NFS_CAP_SECURITY_LABEL);
2882                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2883                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2884                         server->caps |= NFS_CAP_ACLS;
2885                 if (res.has_links != 0)
2886                         server->caps |= NFS_CAP_HARDLINKS;
2887                 if (res.has_symlinks != 0)
2888                         server->caps |= NFS_CAP_SYMLINKS;
2889                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2890                         server->caps |= NFS_CAP_FILEID;
2891                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2892                         server->caps |= NFS_CAP_MODE;
2893                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2894                         server->caps |= NFS_CAP_NLINK;
2895                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2896                         server->caps |= NFS_CAP_OWNER;
2897                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2898                         server->caps |= NFS_CAP_OWNER_GROUP;
2899                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2900                         server->caps |= NFS_CAP_ATIME;
2901                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2902                         server->caps |= NFS_CAP_CTIME;
2903                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2904                         server->caps |= NFS_CAP_MTIME;
2905 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2906                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2907                         server->caps |= NFS_CAP_SECURITY_LABEL;
2908 #endif
2909                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2910                                 sizeof(server->attr_bitmask));
2911                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2912
2913                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2914                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2915                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2916                 server->cache_consistency_bitmask[2] = 0;
2917                 server->acl_bitmask = res.acl_bitmask;
2918                 server->fh_expire_type = res.fh_expire_type;
2919         }
2920
2921         return status;
2922 }
2923
2924 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2925 {
2926         struct nfs4_exception exception = { };
2927         int err;
2928         do {
2929                 err = nfs4_handle_exception(server,
2930                                 _nfs4_server_capabilities(server, fhandle),
2931                                 &exception);
2932         } while (exception.retry);
2933         return err;
2934 }
2935
2936 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2937                 struct nfs_fsinfo *info)
2938 {
2939         u32 bitmask[3];
2940         struct nfs4_lookup_root_arg args = {
2941                 .bitmask = bitmask,
2942         };
2943         struct nfs4_lookup_res res = {
2944                 .server = server,
2945                 .fattr = info->fattr,
2946                 .fh = fhandle,
2947         };
2948         struct rpc_message msg = {
2949                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2950                 .rpc_argp = &args,
2951                 .rpc_resp = &res,
2952         };
2953
2954         bitmask[0] = nfs4_fattr_bitmap[0];
2955         bitmask[1] = nfs4_fattr_bitmap[1];
2956         /*
2957          * Process the label in the upcoming getfattr
2958          */
2959         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2960
2961         nfs_fattr_init(info->fattr);
2962         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2963 }
2964
2965 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2966                 struct nfs_fsinfo *info)
2967 {
2968         struct nfs4_exception exception = { };
2969         int err;
2970         do {
2971                 err = _nfs4_lookup_root(server, fhandle, info);
2972                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2973                 switch (err) {
2974                 case 0:
2975                 case -NFS4ERR_WRONGSEC:
2976                         goto out;
2977                 default:
2978                         err = nfs4_handle_exception(server, err, &exception);
2979                 }
2980         } while (exception.retry);
2981 out:
2982         return err;
2983 }
2984
2985 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2986                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2987 {
2988         struct rpc_auth_create_args auth_args = {
2989                 .pseudoflavor = flavor,
2990         };
2991         struct rpc_auth *auth;
2992         int ret;
2993
2994         auth = rpcauth_create(&auth_args, server->client);
2995         if (IS_ERR(auth)) {
2996                 ret = -EACCES;
2997                 goto out;
2998         }
2999         ret = nfs4_lookup_root(server, fhandle, info);
3000 out:
3001         return ret;
3002 }
3003
3004 /*
3005  * Retry pseudoroot lookup with various security flavors.  We do this when:
3006  *
3007  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3008  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3009  *
3010  * Returns zero on success, or a negative NFS4ERR value, or a
3011  * negative errno value.
3012  */
3013 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3014                               struct nfs_fsinfo *info)
3015 {
3016         /* Per 3530bis 15.33.5 */
3017         static const rpc_authflavor_t flav_array[] = {
3018                 RPC_AUTH_GSS_KRB5P,
3019                 RPC_AUTH_GSS_KRB5I,
3020                 RPC_AUTH_GSS_KRB5,
3021                 RPC_AUTH_UNIX,                  /* courtesy */
3022                 RPC_AUTH_NULL,
3023         };
3024         int status = -EPERM;
3025         size_t i;
3026
3027         if (server->auth_info.flavor_len > 0) {
3028                 /* try each flavor specified by user */
3029                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3030                         status = nfs4_lookup_root_sec(server, fhandle, info,
3031                                                 server->auth_info.flavors[i]);
3032                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3033                                 continue;
3034                         break;
3035                 }
3036         } else {
3037                 /* no flavors specified by user, try default list */
3038                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3039                         status = nfs4_lookup_root_sec(server, fhandle, info,
3040                                                       flav_array[i]);
3041                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3042                                 continue;
3043                         break;
3044                 }
3045         }
3046
3047         /*
3048          * -EACCESS could mean that the user doesn't have correct permissions
3049          * to access the mount.  It could also mean that we tried to mount
3050          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3051          * existing mount programs don't handle -EACCES very well so it should
3052          * be mapped to -EPERM instead.
3053          */
3054         if (status == -EACCES)
3055                 status = -EPERM;
3056         return status;
3057 }
3058
3059 static int nfs4_do_find_root_sec(struct nfs_server *server,
3060                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3061 {
3062         int mv = server->nfs_client->cl_minorversion;
3063         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3064 }
3065
3066 /**
3067  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3068  * @server: initialized nfs_server handle
3069  * @fhandle: we fill in the pseudo-fs root file handle
3070  * @info: we fill in an FSINFO struct
3071  * @auth_probe: probe the auth flavours
3072  *
3073  * Returns zero on success, or a negative errno.
3074  */
3075 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3076                          struct nfs_fsinfo *info,
3077                          bool auth_probe)
3078 {
3079         int status;
3080
3081         switch (auth_probe) {
3082         case false:
3083                 status = nfs4_lookup_root(server, fhandle, info);
3084                 if (status != -NFS4ERR_WRONGSEC)
3085                         break;
3086         default:
3087                 status = nfs4_do_find_root_sec(server, fhandle, info);
3088         }
3089
3090         if (status == 0)
3091                 status = nfs4_server_capabilities(server, fhandle);
3092         if (status == 0)
3093                 status = nfs4_do_fsinfo(server, fhandle, info);
3094
3095         return nfs4_map_errors(status);
3096 }
3097
3098 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3099                               struct nfs_fsinfo *info)
3100 {
3101         int error;
3102         struct nfs_fattr *fattr = info->fattr;
3103         struct nfs4_label *label = NULL;
3104
3105         error = nfs4_server_capabilities(server, mntfh);
3106         if (error < 0) {
3107                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3108                 return error;
3109         }
3110
3111         label = nfs4_label_alloc(server, GFP_KERNEL);
3112         if (IS_ERR(label))
3113                 return PTR_ERR(label);
3114
3115         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3116         if (error < 0) {
3117                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3118                 goto err_free_label;
3119         }
3120
3121         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3122             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3123                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3124
3125 err_free_label:
3126         nfs4_label_free(label);
3127
3128         return error;
3129 }
3130
3131 /*
3132  * Get locations and (maybe) other attributes of a referral.
3133  * Note that we'll actually follow the referral later when
3134  * we detect fsid mismatch in inode revalidation
3135  */
3136 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3137                              const struct qstr *name, struct nfs_fattr *fattr,
3138                              struct nfs_fh *fhandle)
3139 {
3140         int status = -ENOMEM;
3141         struct page *page = NULL;
3142         struct nfs4_fs_locations *locations = NULL;
3143
3144         page = alloc_page(GFP_KERNEL);
3145         if (page == NULL)
3146                 goto out;
3147         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3148         if (locations == NULL)
3149                 goto out;
3150
3151         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3152         if (status != 0)
3153                 goto out;
3154
3155         /*
3156          * If the fsid didn't change, this is a migration event, not a
3157          * referral.  Cause us to drop into the exception handler, which
3158          * will kick off migration recovery.
3159          */
3160         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3161                 dprintk("%s: server did not return a different fsid for"
3162                         " a referral at %s\n", __func__, name->name);
3163                 status = -NFS4ERR_MOVED;
3164                 goto out;
3165         }
3166         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3167         nfs_fixup_referral_attributes(&locations->fattr);
3168
3169         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3170         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3171         memset(fhandle, 0, sizeof(struct nfs_fh));
3172 out:
3173         if (page)
3174                 __free_page(page);
3175         kfree(locations);
3176         return status;
3177 }
3178
3179 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3180                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3181 {
3182         struct nfs4_getattr_arg args = {
3183                 .fh = fhandle,
3184                 .bitmask = server->attr_bitmask,
3185         };
3186         struct nfs4_getattr_res res = {
3187                 .fattr = fattr,
3188                 .label = label,
3189                 .server = server,
3190         };
3191         struct rpc_message msg = {
3192                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3193                 .rpc_argp = &args,
3194                 .rpc_resp = &res,
3195         };
3196
3197         args.bitmask = nfs4_bitmask(server, label);
3198
3199         nfs_fattr_init(fattr);
3200         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3201 }
3202
3203 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3204                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3205 {
3206         struct nfs4_exception exception = { };
3207         int err;
3208         do {
3209                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3210                 trace_nfs4_getattr(server, fhandle, fattr, err);
3211                 err = nfs4_handle_exception(server, err,
3212                                 &exception);
3213         } while (exception.retry);
3214         return err;
3215 }
3216
3217 /*
3218  * The file is not closed if it is opened due to the a request to change
3219  * the size of the file. The open call will not be needed once the
3220  * VFS layer lookup-intents are implemented.
3221  *
3222  * Close is called when the inode is destroyed.
3223  * If we haven't opened the file for O_WRONLY, we
3224  * need to in the size_change case to obtain a stateid.
3225  *
3226  * Got race?
3227  * Because OPEN is always done by name in nfsv4, it is
3228  * possible that we opened a different file by the same
3229  * name.  We can recognize this race condition, but we
3230  * can't do anything about it besides returning an error.
3231  *
3232  * This will be fixed with VFS changes (lookup-intent).
3233  */
3234 static int
3235 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3236                   struct iattr *sattr)
3237 {
3238         struct inode *inode = dentry->d_inode;
3239         struct rpc_cred *cred = NULL;
3240         struct nfs4_state *state = NULL;
3241         struct nfs4_label *label = NULL;
3242         int status;
3243
3244         if (pnfs_ld_layoutret_on_setattr(inode) &&
3245             sattr->ia_valid & ATTR_SIZE &&
3246             sattr->ia_size < i_size_read(inode))
3247                 pnfs_commit_and_return_layout(inode);
3248
3249         nfs_fattr_init(fattr);
3250
3251         /* Deal with open(O_TRUNC) */
3252         if (sattr->ia_valid & ATTR_OPEN)
3253                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3254
3255         /* Optimization: if the end result is no change, don't RPC */
3256         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3257                 return 0;
3258
3259         /* Search for an existing open(O_WRITE) file */
3260         if (sattr->ia_valid & ATTR_FILE) {
3261                 struct nfs_open_context *ctx;
3262
3263                 ctx = nfs_file_open_context(sattr->ia_file);
3264                 if (ctx) {
3265                         cred = ctx->cred;
3266                         state = ctx->state;
3267                 }
3268         }
3269
3270         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3271         if (IS_ERR(label))
3272                 return PTR_ERR(label);
3273
3274         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3275         if (status == 0) {
3276                 nfs_setattr_update_inode(inode, sattr);
3277                 nfs_setsecurity(inode, fattr, label);
3278         }
3279         nfs4_label_free(label);
3280         return status;
3281 }
3282
3283 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3284                 const struct qstr *name, struct nfs_fh *fhandle,
3285                 struct nfs_fattr *fattr, struct nfs4_label *label)
3286 {
3287         struct nfs_server *server = NFS_SERVER(dir);
3288         int                    status;
3289         struct nfs4_lookup_arg args = {
3290                 .bitmask = server->attr_bitmask,
3291                 .dir_fh = NFS_FH(dir),
3292                 .name = name,
3293         };
3294         struct nfs4_lookup_res res = {
3295                 .server = server,
3296                 .fattr = fattr,
3297                 .label = label,
3298                 .fh = fhandle,
3299         };
3300         struct rpc_message msg = {
3301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3302                 .rpc_argp = &args,
3303                 .rpc_resp = &res,
3304         };
3305
3306         args.bitmask = nfs4_bitmask(server, label);
3307
3308         nfs_fattr_init(fattr);
3309
3310         dprintk("NFS call  lookup %s\n", name->name);
3311         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3312         dprintk("NFS reply lookup: %d\n", status);
3313         return status;
3314 }
3315
3316 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3317 {
3318         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3319                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3320         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3321         fattr->nlink = 2;
3322 }
3323
3324 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3325                                    struct qstr *name, struct nfs_fh *fhandle,
3326                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3327 {
3328         struct nfs4_exception exception = { };
3329         struct rpc_clnt *client = *clnt;
3330         int err;
3331         do {
3332                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3333                 trace_nfs4_lookup(dir, name, err);
3334                 switch (err) {
3335                 case -NFS4ERR_BADNAME:
3336                         err = -ENOENT;
3337                         goto out;
3338                 case -NFS4ERR_MOVED:
3339                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3340                         goto out;
3341                 case -NFS4ERR_WRONGSEC:
3342                         err = -EPERM;
3343                         if (client != *clnt)
3344                                 goto out;
3345                         client = nfs4_negotiate_security(client, dir, name);
3346                         if (IS_ERR(client))
3347                                 return PTR_ERR(client);
3348
3349                         exception.retry = 1;
3350                         break;
3351                 default:
3352                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3353                 }
3354         } while (exception.retry);
3355
3356 out:
3357         if (err == 0)
3358                 *clnt = client;
3359         else if (client != *clnt)
3360                 rpc_shutdown_client(client);
3361
3362         return err;
3363 }
3364
3365 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3366                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3367                             struct nfs4_label *label)
3368 {
3369         int status;
3370         struct rpc_clnt *client = NFS_CLIENT(dir);
3371
3372         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3373         if (client != NFS_CLIENT(dir)) {
3374                 rpc_shutdown_client(client);
3375                 nfs_fixup_secinfo_attributes(fattr);
3376         }
3377         return status;
3378 }
3379
3380 struct rpc_clnt *
3381 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3382                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3383 {
3384         struct rpc_clnt *client = NFS_CLIENT(dir);
3385         int status;
3386
3387         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3388         if (status < 0)
3389                 return ERR_PTR(status);
3390         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3391 }
3392
3393 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3394 {
3395         struct nfs_server *server = NFS_SERVER(inode);
3396         struct nfs4_accessargs args = {
3397                 .fh = NFS_FH(inode),
3398                 .bitmask = server->cache_consistency_bitmask,
3399         };
3400         struct nfs4_accessres res = {
3401                 .server = server,
3402         };
3403         struct rpc_message msg = {
3404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3405                 .rpc_argp = &args,
3406                 .rpc_resp = &res,
3407                 .rpc_cred = entry->cred,
3408         };
3409         int mode = entry->mask;
3410         int status = 0;
3411
3412         /*
3413          * Determine which access bits we want to ask for...
3414          */
3415         if (mode & MAY_READ)
3416                 args.access |= NFS4_ACCESS_READ;
3417         if (S_ISDIR(inode->i_mode)) {
3418                 if (mode & MAY_WRITE)
3419                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3420                 if (mode & MAY_EXEC)
3421                         args.access |= NFS4_ACCESS_LOOKUP;
3422         } else {
3423                 if (mode & MAY_WRITE)
3424                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3425                 if (mode & MAY_EXEC)
3426                         args.access |= NFS4_ACCESS_EXECUTE;
3427         }
3428
3429         res.fattr = nfs_alloc_fattr();
3430         if (res.fattr == NULL)
3431                 return -ENOMEM;
3432
3433         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3434         if (!status) {
3435                 nfs_access_set_mask(entry, res.access);
3436                 nfs_refresh_inode(inode, res.fattr);
3437         }
3438         nfs_free_fattr(res.fattr);
3439         return status;
3440 }
3441
3442 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3443 {
3444         struct nfs4_exception exception = { };
3445         int err;
3446         do {
3447                 err = _nfs4_proc_access(inode, entry);
3448                 trace_nfs4_access(inode, err);
3449                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3450                                 &exception);
3451         } while (exception.retry);
3452         return err;
3453 }
3454
3455 /*
3456  * TODO: For the time being, we don't try to get any attributes
3457  * along with any of the zero-copy operations READ, READDIR,
3458  * READLINK, WRITE.
3459  *
3460  * In the case of the first three, we want to put the GETATTR
3461  * after the read-type operation -- this is because it is hard
3462  * to predict the length of a GETATTR response in v4, and thus
3463  * align the READ data correctly.  This means that the GETATTR
3464  * may end up partially falling into the page cache, and we should
3465  * shift it into the 'tail' of the xdr_buf before processing.
3466  * To do this efficiently, we need to know the total length
3467  * of data received, which doesn't seem to be available outside
3468  * of the RPC layer.
3469  *
3470  * In the case of WRITE, we also want to put the GETATTR after
3471  * the operation -- in this case because we want to make sure
3472  * we get the post-operation mtime and size.
3473  *
3474  * Both of these changes to the XDR layer would in fact be quite
3475  * minor, but I decided to leave them for a subsequent patch.
3476  */
3477 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3478                 unsigned int pgbase, unsigned int pglen)
3479 {
3480         struct nfs4_readlink args = {
3481                 .fh       = NFS_FH(inode),
3482                 .pgbase   = pgbase,
3483                 .pglen    = pglen,
3484                 .pages    = &page,
3485         };
3486         struct nfs4_readlink_res res;
3487         struct rpc_message msg = {
3488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3489                 .rpc_argp = &args,
3490                 .rpc_resp = &res,
3491         };
3492
3493         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3494 }
3495
3496 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3497                 unsigned int pgbase, unsigned int pglen)
3498 {
3499         struct nfs4_exception exception = { };
3500         int err;
3501         do {
3502                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3503                 trace_nfs4_readlink(inode, err);
3504                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3505                                 &exception);
3506         } while (exception.retry);
3507         return err;
3508 }
3509
3510 /*
3511  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3512  */
3513 static int
3514 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3515                  int flags)
3516 {
3517         struct nfs4_label l, *ilabel = NULL;
3518         struct nfs_open_context *ctx;
3519         struct nfs4_state *state;
3520         int opened = 0;
3521         int status = 0;
3522
3523         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3524         if (IS_ERR(ctx))
3525                 return PTR_ERR(ctx);
3526
3527         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3528
3529         sattr->ia_mode &= ~current_umask();
3530         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3531         if (IS_ERR(state)) {
3532                 status = PTR_ERR(state);
3533                 goto out;
3534         }
3535 out:
3536         nfs4_label_release_security(ilabel);
3537         put_nfs_open_context(ctx);
3538         return status;
3539 }
3540
3541 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3542 {
3543         struct nfs_server *server = NFS_SERVER(dir);
3544         struct nfs_removeargs args = {
3545                 .fh = NFS_FH(dir),
3546                 .name = *name,
3547         };
3548         struct nfs_removeres res = {
3549                 .server = server,
3550         };
3551         struct rpc_message msg = {
3552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3553                 .rpc_argp = &args,
3554                 .rpc_resp = &res,
3555         };
3556         int status;
3557
3558         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3559         if (status == 0)
3560                 update_changeattr(dir, &res.cinfo);
3561         return status;
3562 }
3563
3564 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3565 {
3566         struct nfs4_exception exception = { };
3567         int err;
3568         do {
3569                 err = _nfs4_proc_remove(dir, name);
3570                 trace_nfs4_remove(dir, name, err);
3571                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3572                                 &exception);
3573         } while (exception.retry);
3574         return err;
3575 }
3576
3577 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3578 {
3579         struct nfs_server *server = NFS_SERVER(dir);
3580         struct nfs_removeargs *args = msg->rpc_argp;
3581         struct nfs_removeres *res = msg->rpc_resp;
3582
3583         res->server = server;
3584         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3585         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3586
3587         nfs_fattr_init(res->dir_attr);
3588 }
3589
3590 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3591 {
3592         nfs4_setup_sequence(NFS_SERVER(data->dir),
3593                         &data->args.seq_args,
3594                         &data->res.seq_res,
3595                         task);
3596 }
3597
3598 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3599 {
3600         struct nfs_unlinkdata *data = task->tk_calldata;
3601         struct nfs_removeres *res = &data->res;
3602
3603         if (!nfs4_sequence_done(task, &res->seq_res))
3604                 return 0;
3605         if (nfs4_async_handle_error(task, res->server, NULL,
3606                                     &data->timeout) == -EAGAIN)
3607                 return 0;
3608         update_changeattr(dir, &res->cinfo);
3609         return 1;
3610 }
3611
3612 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3613 {
3614         struct nfs_server *server = NFS_SERVER(dir);
3615         struct nfs_renameargs *arg = msg->rpc_argp;
3616         struct nfs_renameres *res = msg->rpc_resp;
3617
3618         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3619         res->server = server;
3620         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3621 }
3622
3623 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3624 {
3625         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3626                         &data->args.seq_args,
3627                         &data->res.seq_res,
3628                         task);
3629 }
3630
3631 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3632                                  struct inode *new_dir)
3633 {
3634         struct nfs_renamedata *data = task->tk_calldata;
3635         struct nfs_renameres *res = &data->res;
3636
3637         if (!nfs4_sequence_done(task, &res->seq_res))
3638                 return 0;
3639         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3640                 return 0;
3641
3642         update_changeattr(old_dir, &res->old_cinfo);
3643         update_changeattr(new_dir, &res->new_cinfo);
3644         return 1;
3645 }
3646
3647 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3648 {
3649         struct nfs_server *server = NFS_SERVER(inode);
3650         struct nfs4_link_arg arg = {
3651                 .fh     = NFS_FH(inode),
3652                 .dir_fh = NFS_FH(dir),
3653                 .name   = name,
3654                 .bitmask = server->attr_bitmask,
3655         };
3656         struct nfs4_link_res res = {
3657                 .server = server,
3658                 .label = NULL,
3659         };
3660         struct rpc_message msg = {
3661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3662                 .rpc_argp = &arg,
3663                 .rpc_resp = &res,
3664         };
3665         int status = -ENOMEM;
3666
3667         res.fattr = nfs_alloc_fattr();
3668         if (res.fattr == NULL)
3669                 goto out;
3670
3671         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3672         if (IS_ERR(res.label)) {
3673                 status = PTR_ERR(res.label);
3674                 goto out;
3675         }
3676         arg.bitmask = nfs4_bitmask(server, res.label);
3677
3678         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3679         if (!status) {
3680                 update_changeattr(dir, &res.cinfo);
3681                 status = nfs_post_op_update_inode(inode, res.fattr);
3682                 if (!status)
3683                         nfs_setsecurity(inode, res.fattr, res.label);
3684         }
3685
3686
3687         nfs4_label_free(res.label);
3688
3689 out:
3690         nfs_free_fattr(res.fattr);
3691         return status;
3692 }
3693
3694 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3695 {
3696         struct nfs4_exception exception = { };
3697         int err;
3698         do {
3699                 err = nfs4_handle_exception(NFS_SERVER(inode),
3700                                 _nfs4_proc_link(inode, dir, name),
3701                                 &exception);
3702         } while (exception.retry);
3703         return err;
3704 }
3705
3706 struct nfs4_createdata {
3707         struct rpc_message msg;
3708         struct nfs4_create_arg arg;
3709         struct nfs4_create_res res;
3710         struct nfs_fh fh;
3711         struct nfs_fattr fattr;
3712         struct nfs4_label *label;
3713 };
3714
3715 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3716                 struct qstr *name, struct iattr *sattr, u32 ftype)
3717 {
3718         struct nfs4_createdata *data;
3719
3720         data = kzalloc(sizeof(*data), GFP_KERNEL);
3721         if (data != NULL) {
3722                 struct nfs_server *server = NFS_SERVER(dir);
3723
3724                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3725                 if (IS_ERR(data->label))
3726                         goto out_free;
3727
3728                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3729                 data->msg.rpc_argp = &data->arg;
3730                 data->msg.rpc_resp = &data->res;
3731                 data->arg.dir_fh = NFS_FH(dir);
3732                 data->arg.server = server;
3733                 data->arg.name = name;
3734                 data->arg.attrs = sattr;
3735                 data->arg.ftype = ftype;
3736                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3737                 data->res.server = server;
3738                 data->res.fh = &data->fh;
3739                 data->res.fattr = &data->fattr;
3740                 data->res.label = data->label;
3741                 nfs_fattr_init(data->res.fattr);
3742         }
3743         return data;
3744 out_free:
3745         kfree(data);
3746         return NULL;
3747 }
3748
3749 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3750 {
3751         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3752                                     &data->arg.seq_args, &data->res.seq_res, 1);
3753         if (status == 0) {
3754                 update_changeattr(dir, &data->res.dir_cinfo);
3755                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3756         }
3757         return status;
3758 }
3759
3760 static void nfs4_free_createdata(struct nfs4_createdata *data)
3761 {
3762         nfs4_label_free(data->label);
3763         kfree(data);
3764 }
3765
3766 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3767                 struct page *page, unsigned int len, struct iattr *sattr,
3768                 struct nfs4_label *label)
3769 {
3770         struct nfs4_createdata *data;
3771         int status = -ENAMETOOLONG;
3772
3773         if (len > NFS4_MAXPATHLEN)
3774                 goto out;
3775
3776         status = -ENOMEM;
3777         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3778         if (data == NULL)
3779                 goto out;
3780
3781         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3782         data->arg.u.symlink.pages = &page;
3783         data->arg.u.symlink.len = len;
3784         data->arg.label = label;
3785
3786         status = nfs4_do_create(dir, dentry, data);
3787
3788         nfs4_free_createdata(data);
3789 out:
3790         return status;
3791 }
3792
3793 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3794                 struct page *page, unsigned int len, struct iattr *sattr)
3795 {
3796         struct nfs4_exception exception = { };
3797         struct nfs4_label l, *label = NULL;
3798         int err;
3799
3800         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3801
3802         do {
3803                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3804                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3805                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3806                                 &exception);
3807         } while (exception.retry);
3808
3809         nfs4_label_release_security(label);
3810         return err;
3811 }
3812
3813 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3814                 struct iattr *sattr, struct nfs4_label *label)
3815 {
3816         struct nfs4_createdata *data;
3817         int status = -ENOMEM;
3818
3819         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3820         if (data == NULL)
3821                 goto out;
3822
3823         data->arg.label = label;
3824         status = nfs4_do_create(dir, dentry, data);
3825
3826         nfs4_free_createdata(data);
3827 out:
3828         return status;
3829 }
3830
3831 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3832                 struct iattr *sattr)
3833 {
3834         struct nfs4_exception exception = { };
3835         struct nfs4_label l, *label = NULL;
3836         int err;
3837
3838         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3839
3840         sattr->ia_mode &= ~current_umask();
3841         do {
3842                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3843                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3844                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3845                                 &exception);
3846         } while (exception.retry);
3847         nfs4_label_release_security(label);
3848
3849         return err;
3850 }
3851
3852 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3853                 u64 cookie, struct page **pages, unsigned int count, int plus)
3854 {
3855         struct inode            *dir = dentry->d_inode;
3856         struct nfs4_readdir_arg args = {
3857                 .fh = NFS_FH(dir),
3858                 .pages = pages,
3859                 .pgbase = 0,
3860                 .count = count,
3861                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3862                 .plus = plus,
3863         };
3864         struct nfs4_readdir_res res;
3865         struct rpc_message msg = {
3866                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3867                 .rpc_argp = &args,
3868                 .rpc_resp = &res,
3869                 .rpc_cred = cred,
3870         };
3871         int                     status;
3872
3873         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3874                         dentry,
3875                         (unsigned long long)cookie);
3876         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3877         res.pgbase = args.pgbase;
3878         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3879         if (status >= 0) {
3880                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3881                 status += args.pgbase;
3882         }
3883
3884         nfs_invalidate_atime(dir);
3885
3886         dprintk("%s: returns %d\n", __func__, status);
3887         return status;
3888 }
3889
3890 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3891                 u64 cookie, struct page **pages, unsigned int count, int plus)
3892 {
3893         struct nfs4_exception exception = { };
3894         int err;
3895         do {
3896                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3897                                 pages, count, plus);
3898                 trace_nfs4_readdir(dentry->d_inode, err);
3899                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3900                                 &exception);
3901         } while (exception.retry);
3902         return err;
3903 }
3904
3905 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3906                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3907 {
3908         struct nfs4_createdata *data;
3909         int mode = sattr->ia_mode;
3910         int status = -ENOMEM;
3911
3912         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3913         if (data == NULL)
3914                 goto out;
3915
3916         if (S_ISFIFO(mode))
3917                 data->arg.ftype = NF4FIFO;
3918         else if (S_ISBLK(mode)) {
3919                 data->arg.ftype = NF4BLK;
3920                 data->arg.u.device.specdata1 = MAJOR(rdev);
3921                 data->arg.u.device.specdata2 = MINOR(rdev);
3922         }
3923         else if (S_ISCHR(mode)) {
3924                 data->arg.ftype = NF4CHR;
3925                 data->arg.u.device.specdata1 = MAJOR(rdev);
3926                 data->arg.u.device.specdata2 = MINOR(rdev);
3927         } else if (!S_ISSOCK(mode)) {
3928                 status = -EINVAL;
3929                 goto out_free;
3930         }
3931
3932         data->arg.label = label;
3933         status = nfs4_do_create(dir, dentry, data);
3934 out_free:
3935         nfs4_free_createdata(data);
3936 out:
3937         return status;
3938 }
3939
3940 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3941                 struct iattr *sattr, dev_t rdev)
3942 {
3943         struct nfs4_exception exception = { };
3944         struct nfs4_label l, *label = NULL;
3945         int err;
3946
3947         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3948
3949         sattr->ia_mode &= ~current_umask();
3950         do {
3951                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3952                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3953                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3954                                 &exception);
3955         } while (exception.retry);
3956
3957         nfs4_label_release_security(label);
3958
3959         return err;
3960 }
3961
3962 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3963                  struct nfs_fsstat *fsstat)
3964 {
3965         struct nfs4_statfs_arg args = {
3966                 .fh = fhandle,
3967                 .bitmask = server->attr_bitmask,
3968         };
3969         struct nfs4_statfs_res res = {
3970                 .fsstat = fsstat,
3971         };
3972         struct rpc_message msg = {
3973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3974                 .rpc_argp = &args,
3975                 .rpc_resp = &res,
3976         };
3977
3978         nfs_fattr_init(fsstat->fattr);
3979         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3980 }
3981
3982 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3983 {
3984         struct nfs4_exception exception = { };
3985         int err;
3986         do {
3987                 err = nfs4_handle_exception(server,
3988                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3989                                 &exception);
3990         } while (exception.retry);
3991         return err;
3992 }
3993
3994 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3995                 struct nfs_fsinfo *fsinfo)
3996 {
3997         struct nfs4_fsinfo_arg args = {
3998                 .fh = fhandle,
3999                 .bitmask = server->attr_bitmask,
4000         };
4001         struct nfs4_fsinfo_res res = {
4002                 .fsinfo = fsinfo,
4003         };
4004         struct rpc_message msg = {
4005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4006                 .rpc_argp = &args,
4007                 .rpc_resp = &res,
4008         };
4009
4010         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4011 }
4012
4013 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4014 {
4015         struct nfs4_exception exception = { };
4016         unsigned long now = jiffies;
4017         int err;
4018
4019         do {
4020                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4021                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4022                 if (err == 0) {
4023                         struct nfs_client *clp = server->nfs_client;
4024
4025                         spin_lock(&clp->cl_lock);
4026                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4027                         clp->cl_last_renewal = now;
4028                         spin_unlock(&clp->cl_lock);
4029                         break;
4030                 }
4031                 err = nfs4_handle_exception(server, err, &exception);
4032         } while (exception.retry);
4033         return err;
4034 }
4035
4036 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4037 {
4038         int error;
4039
4040         nfs_fattr_init(fsinfo->fattr);
4041         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4042         if (error == 0) {
4043                 /* block layout checks this! */
4044                 server->pnfs_blksize = fsinfo->blksize;
4045                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4046         }
4047
4048         return error;
4049 }
4050
4051 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4052                 struct nfs_pathconf *pathconf)
4053 {
4054         struct nfs4_pathconf_arg args = {
4055                 .fh = fhandle,
4056                 .bitmask = server->attr_bitmask,
4057         };
4058         struct nfs4_pathconf_res res = {
4059                 .pathconf = pathconf,
4060         };
4061         struct rpc_message msg = {
4062                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4063                 .rpc_argp = &args,
4064                 .rpc_resp = &res,
4065         };
4066
4067         /* None of the pathconf attributes are mandatory to implement */
4068         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4069                 memset(pathconf, 0, sizeof(*pathconf));
4070                 return 0;
4071         }
4072
4073         nfs_fattr_init(pathconf->fattr);
4074         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4075 }
4076
4077 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4078                 struct nfs_pathconf *pathconf)
4079 {
4080         struct nfs4_exception exception = { };
4081         int err;
4082
4083         do {
4084                 err = nfs4_handle_exception(server,
4085                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4086                                 &exception);
4087         } while (exception.retry);
4088         return err;
4089 }
4090
4091 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4092                 const struct nfs_open_context *ctx,
4093                 const struct nfs_lock_context *l_ctx,
4094                 fmode_t fmode)
4095 {
4096         const struct nfs_lockowner *lockowner = NULL;
4097
4098         if (l_ctx != NULL)
4099                 lockowner = &l_ctx->lockowner;
4100         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4101 }
4102 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4103
4104 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4105                 const struct nfs_open_context *ctx,
4106                 const struct nfs_lock_context *l_ctx,
4107                 fmode_t fmode)
4108 {
4109         nfs4_stateid current_stateid;
4110
4111         /* If the current stateid represents a lost lock, then exit */
4112         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4113                 return true;
4114         return nfs4_stateid_match(stateid, &current_stateid);
4115 }
4116
4117 static bool nfs4_error_stateid_expired(int err)
4118 {
4119         switch (err) {
4120         case -NFS4ERR_DELEG_REVOKED:
4121         case -NFS4ERR_ADMIN_REVOKED:
4122         case -NFS4ERR_BAD_STATEID:
4123         case -NFS4ERR_STALE_STATEID:
4124         case -NFS4ERR_OLD_STATEID:
4125         case -NFS4ERR_OPENMODE:
4126         case -NFS4ERR_EXPIRED:
4127                 return true;
4128         }
4129         return false;
4130 }
4131
4132 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4133 {
4134         nfs_invalidate_atime(hdr->inode);
4135 }
4136
4137 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4138 {
4139         struct nfs_server *server = NFS_SERVER(hdr->inode);
4140
4141         trace_nfs4_read(hdr, task->tk_status);
4142         if (nfs4_async_handle_error(task, server,
4143                                     hdr->args.context->state,
4144                                     NULL) == -EAGAIN) {
4145                 rpc_restart_call_prepare(task);
4146                 return -EAGAIN;
4147         }
4148
4149         __nfs4_read_done_cb(hdr);
4150         if (task->tk_status > 0)
4151                 renew_lease(server, hdr->timestamp);
4152         return 0;
4153 }
4154
4155 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4156                 struct nfs_pgio_args *args)
4157 {
4158
4159         if (!nfs4_error_stateid_expired(task->tk_status) ||
4160                 nfs4_stateid_is_current(&args->stateid,
4161                                 args->context,
4162                                 args->lock_context,
4163                                 FMODE_READ))
4164                 return false;
4165         rpc_restart_call_prepare(task);
4166         return true;
4167 }
4168
4169 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4170 {
4171
4172         dprintk("--> %s\n", __func__);
4173
4174         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4175                 return -EAGAIN;
4176         if (nfs4_read_stateid_changed(task, &hdr->args))
4177                 return -EAGAIN;
4178         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4179                                     nfs4_read_done_cb(task, hdr);
4180 }
4181
4182 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4183                                  struct rpc_message *msg)
4184 {
4185         hdr->timestamp   = jiffies;
4186         hdr->pgio_done_cb = nfs4_read_done_cb;
4187         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4188         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4189 }
4190
4191 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4192                                       struct nfs_pgio_header *hdr)
4193 {
4194         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4195                         &hdr->args.seq_args,
4196                         &hdr->res.seq_res,
4197                         task))
4198                 return 0;
4199         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4200                                 hdr->args.lock_context,
4201                                 hdr->rw_ops->rw_mode) == -EIO)
4202                 return -EIO;
4203         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4204                 return -EIO;
4205         return 0;
4206 }
4207
4208 static int nfs4_write_done_cb(struct rpc_task *task,
4209                               struct nfs_pgio_header *hdr)
4210 {
4211         struct inode *inode = hdr->inode;
4212
4213         trace_nfs4_write(hdr, task->tk_status);
4214         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4215                                     hdr->args.context->state,
4216                                     NULL) == -EAGAIN) {
4217                 rpc_restart_call_prepare(task);
4218                 return -EAGAIN;
4219         }
4220         if (task->tk_status >= 0) {
4221                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4222                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4223         }
4224         return 0;
4225 }
4226
4227 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4228                 struct nfs_pgio_args *args)
4229 {
4230
4231         if (!nfs4_error_stateid_expired(task->tk_status) ||
4232                 nfs4_stateid_is_current(&args->stateid,
4233                                 args->context,
4234                                 args->lock_context,
4235                                 FMODE_WRITE))
4236                 return false;
4237         rpc_restart_call_prepare(task);
4238         return true;
4239 }
4240
4241 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4242 {
4243         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4244                 return -EAGAIN;
4245         if (nfs4_write_stateid_changed(task, &hdr->args))
4246                 return -EAGAIN;
4247         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4248                 nfs4_write_done_cb(task, hdr);
4249 }
4250
4251 static
4252 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4253 {
4254         /* Don't request attributes for pNFS or O_DIRECT writes */
4255         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4256                 return false;
4257         /* Otherwise, request attributes if and only if we don't hold
4258          * a delegation
4259          */
4260         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4261 }
4262
4263 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4264                                   struct rpc_message *msg)
4265 {
4266         struct nfs_server *server = NFS_SERVER(hdr->inode);
4267
4268         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4269                 hdr->args.bitmask = NULL;
4270                 hdr->res.fattr = NULL;
4271         } else
4272                 hdr->args.bitmask = server->cache_consistency_bitmask;
4273
4274         if (!hdr->pgio_done_cb)
4275                 hdr->pgio_done_cb = nfs4_write_done_cb;
4276         hdr->res.server = server;
4277         hdr->timestamp   = jiffies;
4278
4279         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4280         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4281 }
4282
4283 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4284 {
4285         nfs4_setup_sequence(NFS_SERVER(data->inode),
4286                         &data->args.seq_args,
4287                         &data->res.seq_res,
4288                         task);
4289 }
4290
4291 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4292 {
4293         struct inode *inode = data->inode;
4294
4295         trace_nfs4_commit(data, task->tk_status);
4296         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4297                                     NULL, NULL) == -EAGAIN) {
4298                 rpc_restart_call_prepare(task);
4299                 return -EAGAIN;
4300         }
4301         return 0;
4302 }
4303
4304 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4305 {
4306         if (!nfs4_sequence_done(task, &data->res.seq_res))
4307                 return -EAGAIN;
4308         return data->commit_done_cb(task, data);
4309 }
4310
4311 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4312 {
4313         struct nfs_server *server = NFS_SERVER(data->inode);
4314
4315         if (data->commit_done_cb == NULL)
4316                 data->commit_done_cb = nfs4_commit_done_cb;
4317         data->res.server = server;
4318         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4319         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4320 }
4321
4322 struct nfs4_renewdata {
4323         struct nfs_client       *client;
4324         unsigned long           timestamp;
4325 };
4326
4327 /*
4328  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4329  * standalone procedure for queueing an asynchronous RENEW.
4330  */
4331 static void nfs4_renew_release(void *calldata)
4332 {
4333         struct nfs4_renewdata *data = calldata;
4334         struct nfs_client *clp = data->client;
4335
4336         if (atomic_read(&clp->cl_count) > 1)
4337                 nfs4_schedule_state_renewal(clp);
4338         nfs_put_client(clp);
4339         kfree(data);
4340 }
4341
4342 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4343 {
4344         struct nfs4_renewdata *data = calldata;
4345         struct nfs_client *clp = data->client;
4346         unsigned long timestamp = data->timestamp;
4347
4348         trace_nfs4_renew_async(clp, task->tk_status);
4349         switch (task->tk_status) {
4350         case 0:
4351                 break;
4352         case -NFS4ERR_LEASE_MOVED:
4353                 nfs4_schedule_lease_moved_recovery(clp);
4354                 break;
4355         default:
4356                 /* Unless we're shutting down, schedule state recovery! */
4357                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4358                         return;
4359                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4360                         nfs4_schedule_lease_recovery(clp);
4361                         return;
4362                 }
4363                 nfs4_schedule_path_down_recovery(clp);
4364         }
4365         do_renew_lease(clp, timestamp);
4366 }
4367
4368 static const struct rpc_call_ops nfs4_renew_ops = {
4369         .rpc_call_done = nfs4_renew_done,
4370         .rpc_release = nfs4_renew_release,
4371 };
4372
4373 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4374 {
4375         struct rpc_message msg = {
4376                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4377                 .rpc_argp       = clp,
4378                 .rpc_cred       = cred,
4379         };
4380         struct nfs4_renewdata *data;
4381
4382         if (renew_flags == 0)
4383                 return 0;
4384         if (!atomic_inc_not_zero(&clp->cl_count))
4385                 return -EIO;
4386         data = kmalloc(sizeof(*data), GFP_NOFS);
4387         if (data == NULL)
4388                 return -ENOMEM;
4389         data->client = clp;
4390         data->timestamp = jiffies;
4391         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4392                         &nfs4_renew_ops, data);
4393 }
4394
4395 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4396 {
4397         struct rpc_message msg = {
4398                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4399                 .rpc_argp       = clp,
4400                 .rpc_cred       = cred,
4401         };
4402         unsigned long now = jiffies;
4403         int status;
4404
4405         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4406         if (status < 0)
4407                 return status;
4408         do_renew_lease(clp, now);
4409         return 0;
4410 }
4411
4412 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4413 {
4414         return server->caps & NFS_CAP_ACLS;
4415 }
4416
4417 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4418  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4419  * the stack.
4420  */
4421 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4422
4423 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4424                 struct page **pages, unsigned int *pgbase)
4425 {
4426         struct page *newpage, **spages;
4427         int rc = 0;
4428         size_t len;
4429         spages = pages;
4430
4431         do {
4432                 len = min_t(size_t, PAGE_SIZE, buflen);
4433                 newpage = alloc_page(GFP_KERNEL);
4434
4435                 if (newpage == NULL)
4436                         goto unwind;
4437                 memcpy(page_address(newpage), buf, len);
4438                 buf += len;
4439                 buflen -= len;
4440                 *pages++ = newpage;
4441                 rc++;
4442         } while (buflen != 0);
4443
4444         return rc;
4445
4446 unwind:
4447         for(; rc > 0; rc--)
4448                 __free_page(spages[rc-1]);
4449         return -ENOMEM;
4450 }
4451
4452 struct nfs4_cached_acl {
4453         int cached;
4454         size_t len;
4455         char data[0];
4456 };
4457
4458 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4459 {
4460         struct nfs_inode *nfsi = NFS_I(inode);
4461
4462         spin_lock(&inode->i_lock);
4463         kfree(nfsi->nfs4_acl);
4464         nfsi->nfs4_acl = acl;
4465         spin_unlock(&inode->i_lock);
4466 }
4467
4468 static void nfs4_zap_acl_attr(struct inode *inode)
4469 {
4470         nfs4_set_cached_acl(inode, NULL);
4471 }
4472
4473 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4474 {
4475         struct nfs_inode *nfsi = NFS_I(inode);
4476         struct nfs4_cached_acl *acl;
4477         int ret = -ENOENT;
4478
4479         spin_lock(&inode->i_lock);
4480         acl = nfsi->nfs4_acl;
4481         if (acl == NULL)
4482                 goto out;
4483         if (buf == NULL) /* user is just asking for length */
4484                 goto out_len;
4485         if (acl->cached == 0)
4486                 goto out;
4487         ret = -ERANGE; /* see getxattr(2) man page */
4488         if (acl->len > buflen)
4489                 goto out;
4490         memcpy(buf, acl->data, acl->len);
4491 out_len:
4492         ret = acl->len;
4493 out:
4494         spin_unlock(&inode->i_lock);
4495         return ret;
4496 }
4497
4498 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4499 {
4500         struct nfs4_cached_acl *acl;
4501         size_t buflen = sizeof(*acl) + acl_len;
4502
4503         if (buflen <= PAGE_SIZE) {
4504                 acl = kmalloc(buflen, GFP_KERNEL);
4505                 if (acl == NULL)
4506                         goto out;
4507                 acl->cached = 1;
4508                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4509         } else {
4510                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4511                 if (acl == NULL)
4512                         goto out;
4513                 acl->cached = 0;
4514         }
4515         acl->len = acl_len;
4516 out:
4517         nfs4_set_cached_acl(inode, acl);
4518 }
4519
4520 /*
4521  * The getxattr API returns the required buffer length when called with a
4522  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4523  * the required buf.  On a NULL buf, we send a page of data to the server
4524  * guessing that the ACL request can be serviced by a page. If so, we cache
4525  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4526  * the cache. If not so, we throw away the page, and cache the required
4527  * length. The next getxattr call will then produce another round trip to
4528  * the server, this time with the input buf of the required size.
4529  */
4530 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4531 {
4532         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4533         struct nfs_getaclargs args = {
4534                 .fh = NFS_FH(inode),
4535                 .acl_pages = pages,
4536                 .acl_len = buflen,
4537         };
4538         struct nfs_getaclres res = {
4539                 .acl_len = buflen,
4540         };
4541         struct rpc_message msg = {
4542                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4543                 .rpc_argp = &args,
4544                 .rpc_resp = &res,
4545         };
4546         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4547         int ret = -ENOMEM, i;
4548
4549         /* As long as we're doing a round trip to the server anyway,
4550          * let's be prepared for a page of acl data. */
4551         if (npages == 0)
4552                 npages = 1;
4553         if (npages > ARRAY_SIZE(pages))
4554                 return -ERANGE;
4555
4556         for (i = 0; i < npages; i++) {
4557                 pages[i] = alloc_page(GFP_KERNEL);
4558                 if (!pages[i])
4559                         goto out_free;
4560         }
4561
4562         /* for decoding across pages */
4563         res.acl_scratch = alloc_page(GFP_KERNEL);
4564         if (!res.acl_scratch)
4565                 goto out_free;
4566
4567         args.acl_len = npages * PAGE_SIZE;
4568         args.acl_pgbase = 0;
4569
4570         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4571                 __func__, buf, buflen, npages, args.acl_len);
4572         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4573                              &msg, &args.seq_args, &res.seq_res, 0);
4574         if (ret)
4575                 goto out_free;
4576
4577         /* Handle the case where the passed-in buffer is too short */
4578         if (res.acl_flags & NFS4_ACL_TRUNC) {
4579                 /* Did the user only issue a request for the acl length? */
4580                 if (buf == NULL)
4581                         goto out_ok;
4582                 ret = -ERANGE;
4583                 goto out_free;
4584         }
4585         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4586         if (buf) {
4587                 if (res.acl_len > buflen) {
4588                         ret = -ERANGE;
4589                         goto out_free;
4590                 }
4591                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4592         }
4593 out_ok:
4594         ret = res.acl_len;
4595 out_free:
4596         for (i = 0; i < npages; i++)
4597                 if (pages[i])
4598                         __free_page(pages[i]);
4599         if (res.acl_scratch)
4600                 __free_page(res.acl_scratch);
4601         return ret;
4602 }
4603
4604 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4605 {
4606         struct nfs4_exception exception = { };
4607         ssize_t ret;
4608         do {
4609                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4610                 trace_nfs4_get_acl(inode, ret);
4611                 if (ret >= 0)
4612                         break;
4613                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4614         } while (exception.retry);
4615         return ret;
4616 }
4617
4618 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4619 {
4620         struct nfs_server *server = NFS_SERVER(inode);
4621         int ret;
4622
4623         if (!nfs4_server_supports_acls(server))
4624                 return -EOPNOTSUPP;
4625         ret = nfs_revalidate_inode(server, inode);
4626         if (ret < 0)
4627                 return ret;
4628         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4629                 nfs_zap_acl_cache(inode);
4630         ret = nfs4_read_cached_acl(inode, buf, buflen);
4631         if (ret != -ENOENT)
4632                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4633                  * but no cached acl data, just the acl length */
4634                 return ret;
4635         return nfs4_get_acl_uncached(inode, buf, buflen);
4636 }
4637
4638 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4639 {
4640         struct nfs_server *server = NFS_SERVER(inode);
4641         struct page *pages[NFS4ACL_MAXPAGES];
4642         struct nfs_setaclargs arg = {
4643                 .fh             = NFS_FH(inode),
4644                 .acl_pages      = pages,
4645                 .acl_len        = buflen,
4646         };
4647         struct nfs_setaclres res;
4648         struct rpc_message msg = {
4649                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4650                 .rpc_argp       = &arg,
4651                 .rpc_resp       = &res,
4652         };
4653         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4654         int ret, i;
4655
4656         if (!nfs4_server_supports_acls(server))
4657                 return -EOPNOTSUPP;
4658         if (npages > ARRAY_SIZE(pages))
4659                 return -ERANGE;
4660         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4661         if (i < 0)
4662                 return i;
4663         nfs4_inode_return_delegation(inode);
4664         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4665
4666         /*
4667          * Free each page after tx, so the only ref left is
4668          * held by the network stack
4669          */
4670         for (; i > 0; i--)
4671                 put_page(pages[i-1]);
4672
4673         /*
4674          * Acl update can result in inode attribute update.
4675          * so mark the attribute cache invalid.
4676          */
4677         spin_lock(&inode->i_lock);
4678         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4679         spin_unlock(&inode->i_lock);
4680         nfs_access_zap_cache(inode);
4681         nfs_zap_acl_cache(inode);
4682         return ret;
4683 }
4684
4685 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4686 {
4687         struct nfs4_exception exception = { };
4688         int err;
4689         do {
4690                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4691                 trace_nfs4_set_acl(inode, err);
4692                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4693                                 &exception);
4694         } while (exception.retry);
4695         return err;
4696 }
4697
4698 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4699 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4700                                         size_t buflen)
4701 {
4702         struct nfs_server *server = NFS_SERVER(inode);
4703         struct nfs_fattr fattr;
4704         struct nfs4_label label = {0, 0, buflen, buf};
4705
4706         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4707         struct nfs4_getattr_arg arg = {
4708                 .fh             = NFS_FH(inode),
4709                 .bitmask        = bitmask,
4710         };
4711         struct nfs4_getattr_res res = {
4712                 .fattr          = &fattr,
4713                 .label          = &label,
4714                 .server         = server,
4715         };
4716         struct rpc_message msg = {
4717                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4718                 .rpc_argp       = &arg,
4719                 .rpc_resp       = &res,
4720         };
4721         int ret;
4722
4723         nfs_fattr_init(&fattr);
4724
4725         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4726         if (ret)
4727                 return ret;
4728         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4729                 return -ENOENT;
4730         if (buflen < label.len)
4731                 return -ERANGE;
4732         return 0;
4733 }
4734
4735 static int nfs4_get_security_label(struct inode *inode, void *buf,
4736                                         size_t buflen)
4737 {
4738         struct nfs4_exception exception = { };
4739         int err;
4740
4741         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4742                 return -EOPNOTSUPP;
4743
4744         do {
4745                 err = _nfs4_get_security_label(inode, buf, buflen);
4746                 trace_nfs4_get_security_label(inode, err);
4747                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4748                                 &exception);
4749         } while (exception.retry);
4750         return err;
4751 }
4752
4753 static int _nfs4_do_set_security_label(struct inode *inode,
4754                 struct nfs4_label *ilabel,
4755                 struct nfs_fattr *fattr,
4756                 struct nfs4_label *olabel)
4757 {
4758
4759         struct iattr sattr = {0};
4760         struct nfs_server *server = NFS_SERVER(inode);
4761         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4762         struct nfs_setattrargs arg = {
4763                 .fh             = NFS_FH(inode),
4764                 .iap            = &sattr,
4765                 .server         = server,
4766                 .bitmask        = bitmask,
4767                 .label          = ilabel,
4768         };
4769         struct nfs_setattrres res = {
4770                 .fattr          = fattr,
4771                 .label          = olabel,
4772                 .server         = server,
4773         };
4774         struct rpc_message msg = {
4775                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4776                 .rpc_argp       = &arg,
4777                 .rpc_resp       = &res,
4778         };
4779         int status;
4780
4781         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4782
4783         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4784         if (status)
4785                 dprintk("%s failed: %d\n", __func__, status);
4786
4787         return status;
4788 }
4789
4790 static int nfs4_do_set_security_label(struct inode *inode,
4791                 struct nfs4_label *ilabel,
4792                 struct nfs_fattr *fattr,
4793                 struct nfs4_label *olabel)
4794 {
4795         struct nfs4_exception exception = { };
4796         int err;
4797
4798         do {
4799                 err = _nfs4_do_set_security_label(inode, ilabel,
4800                                 fattr, olabel);
4801                 trace_nfs4_set_security_label(inode, err);
4802                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4803                                 &exception);
4804         } while (exception.retry);
4805         return err;
4806 }
4807
4808 static int
4809 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4810 {
4811         struct nfs4_label ilabel, *olabel = NULL;
4812         struct nfs_fattr fattr;
4813         struct rpc_cred *cred;
4814         struct inode *inode = dentry->d_inode;
4815         int status;
4816
4817         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4818                 return -EOPNOTSUPP;
4819
4820         nfs_fattr_init(&fattr);
4821
4822         ilabel.pi = 0;
4823         ilabel.lfs = 0;
4824         ilabel.label = (char *)buf;
4825         ilabel.len = buflen;
4826
4827         cred = rpc_lookup_cred();
4828         if (IS_ERR(cred))
4829                 return PTR_ERR(cred);
4830
4831         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4832         if (IS_ERR(olabel)) {
4833                 status = -PTR_ERR(olabel);
4834                 goto out;
4835         }
4836
4837         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4838         if (status == 0)
4839                 nfs_setsecurity(inode, &fattr, olabel);
4840
4841         nfs4_label_free(olabel);
4842 out:
4843         put_rpccred(cred);
4844         return status;
4845 }
4846 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4847
4848
4849 static int
4850 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4851                         struct nfs4_state *state, long *timeout)
4852 {
4853         struct nfs_client *clp = server->nfs_client;
4854
4855         if (task->tk_status >= 0)
4856                 return 0;
4857         switch(task->tk_status) {
4858                 case -NFS4ERR_DELEG_REVOKED:
4859                 case -NFS4ERR_ADMIN_REVOKED:
4860                 case -NFS4ERR_BAD_STATEID:
4861                 case -NFS4ERR_OPENMODE:
4862                         if (state == NULL)
4863                                 break;
4864                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4865                                 goto recovery_failed;
4866                         goto wait_on_recovery;
4867                 case -NFS4ERR_EXPIRED:
4868                         if (state != NULL) {
4869                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4870                                         goto recovery_failed;
4871                         }
4872                 case -NFS4ERR_STALE_STATEID:
4873                 case -NFS4ERR_STALE_CLIENTID:
4874                         nfs4_schedule_lease_recovery(clp);
4875                         goto wait_on_recovery;
4876                 case -NFS4ERR_MOVED:
4877                         if (nfs4_schedule_migration_recovery(server) < 0)
4878                                 goto recovery_failed;
4879                         goto wait_on_recovery;
4880                 case -NFS4ERR_LEASE_MOVED:
4881                         nfs4_schedule_lease_moved_recovery(clp);
4882                         goto wait_on_recovery;
4883 #if defined(CONFIG_NFS_V4_1)
4884                 case -NFS4ERR_BADSESSION:
4885                 case -NFS4ERR_BADSLOT:
4886                 case -NFS4ERR_BAD_HIGH_SLOT:
4887                 case -NFS4ERR_DEADSESSION:
4888                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4889                 case -NFS4ERR_SEQ_FALSE_RETRY:
4890                 case -NFS4ERR_SEQ_MISORDERED:
4891                         dprintk("%s ERROR %d, Reset session\n", __func__,
4892                                 task->tk_status);
4893                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4894                         goto wait_on_recovery;
4895 #endif /* CONFIG_NFS_V4_1 */
4896                 case -NFS4ERR_DELAY:
4897                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4898                         rpc_delay(task, nfs4_update_delay(timeout));
4899                         goto restart_call;
4900                 case -NFS4ERR_GRACE:
4901                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4902                 case -NFS4ERR_RETRY_UNCACHED_REP:
4903                 case -NFS4ERR_OLD_STATEID:
4904                         goto restart_call;
4905         }
4906         task->tk_status = nfs4_map_errors(task->tk_status);
4907         return 0;
4908 recovery_failed:
4909         task->tk_status = -EIO;
4910         return 0;
4911 wait_on_recovery:
4912         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4913         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4914                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4915         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4916                 goto recovery_failed;
4917 restart_call:
4918         task->tk_status = 0;
4919         return -EAGAIN;
4920 }
4921
4922 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4923                                     nfs4_verifier *bootverf)
4924 {
4925         __be32 verf[2];
4926
4927         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4928                 /* An impossible timestamp guarantees this value
4929                  * will never match a generated boot time. */
4930                 verf[0] = 0;
4931                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4932         } else {
4933                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4934                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4935                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4936         }
4937         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4938 }
4939
4940 static unsigned int
4941 nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4942                                    char *buf, size_t len)
4943 {
4944         unsigned int result;
4945
4946         if (clp->cl_owner_id != NULL)
4947                 return strlcpy(buf, clp->cl_owner_id, len);
4948
4949         rcu_read_lock();
4950         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4951                                 clp->cl_ipaddr,
4952                                 rpc_peeraddr2str(clp->cl_rpcclient,
4953                                                         RPC_DISPLAY_ADDR),
4954                                 rpc_peeraddr2str(clp->cl_rpcclient,
4955                                                         RPC_DISPLAY_PROTO));
4956         rcu_read_unlock();
4957         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4958         return result;
4959 }
4960
4961 static unsigned int
4962 nfs4_init_uniform_client_string(struct nfs_client *clp,
4963                                 char *buf, size_t len)
4964 {
4965         const char *nodename = clp->cl_rpcclient->cl_nodename;
4966         unsigned int result;
4967
4968         if (clp->cl_owner_id != NULL)
4969                 return strlcpy(buf, clp->cl_owner_id, len);
4970
4971         if (nfs4_client_id_uniquifier[0] != '\0')
4972                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4973                                 clp->rpc_ops->version,
4974                                 clp->cl_minorversion,
4975                                 nfs4_client_id_uniquifier,
4976                                 nodename);
4977         else
4978                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4979                                 clp->rpc_ops->version, clp->cl_minorversion,
4980                                 nodename);
4981         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4982         return result;
4983 }
4984
4985 /*
4986  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4987  * services.  Advertise one based on the address family of the
4988  * clientaddr.
4989  */
4990 static unsigned int
4991 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4992 {
4993         if (strchr(clp->cl_ipaddr, ':') != NULL)
4994                 return scnprintf(buf, len, "tcp6");
4995         else
4996                 return scnprintf(buf, len, "tcp");
4997 }
4998
4999 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5000 {
5001         struct nfs4_setclientid *sc = calldata;
5002
5003         if (task->tk_status == 0)
5004                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5005 }
5006
5007 static const struct rpc_call_ops nfs4_setclientid_ops = {
5008         .rpc_call_done = nfs4_setclientid_done,
5009 };
5010
5011 /**
5012  * nfs4_proc_setclientid - Negotiate client ID
5013  * @clp: state data structure
5014  * @program: RPC program for NFSv4 callback service
5015  * @port: IP port number for NFS4 callback service
5016  * @cred: RPC credential to use for this call
5017  * @res: where to place the result
5018  *
5019  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5020  */
5021 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5022                 unsigned short port, struct rpc_cred *cred,
5023                 struct nfs4_setclientid_res *res)
5024 {
5025         nfs4_verifier sc_verifier;
5026         struct nfs4_setclientid setclientid = {
5027                 .sc_verifier = &sc_verifier,
5028                 .sc_prog = program,
5029                 .sc_cb_ident = clp->cl_cb_ident,
5030         };
5031         struct rpc_message msg = {
5032                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5033                 .rpc_argp = &setclientid,
5034                 .rpc_resp = res,
5035                 .rpc_cred = cred,
5036         };
5037         struct rpc_task *task;
5038         struct rpc_task_setup task_setup_data = {
5039                 .rpc_client = clp->cl_rpcclient,
5040                 .rpc_message = &msg,
5041                 .callback_ops = &nfs4_setclientid_ops,
5042                 .callback_data = &setclientid,
5043                 .flags = RPC_TASK_TIMEOUT,
5044         };
5045         int status;
5046
5047         /* nfs_client_id4 */
5048         nfs4_init_boot_verifier(clp, &sc_verifier);
5049         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5050                 setclientid.sc_name_len =
5051                                 nfs4_init_uniform_client_string(clp,
5052                                                 setclientid.sc_name,
5053                                                 sizeof(setclientid.sc_name));
5054         else
5055                 setclientid.sc_name_len =
5056                                 nfs4_init_nonuniform_client_string(clp,
5057                                                 setclientid.sc_name,
5058                                                 sizeof(setclientid.sc_name));
5059         /* cb_client4 */
5060         setclientid.sc_netid_len =
5061                                 nfs4_init_callback_netid(clp,
5062                                                 setclientid.sc_netid,
5063                                                 sizeof(setclientid.sc_netid));
5064         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5065                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5066                                 clp->cl_ipaddr, port >> 8, port & 255);
5067
5068         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5069                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5070                 setclientid.sc_name_len, setclientid.sc_name);
5071         task = rpc_run_task(&task_setup_data);
5072         if (IS_ERR(task)) {
5073                 status = PTR_ERR(task);
5074                 goto out;
5075         }
5076         status = task->tk_status;
5077         if (setclientid.sc_cred) {
5078                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5079                 put_rpccred(setclientid.sc_cred);
5080         }
5081         rpc_put_task(task);
5082 out:
5083         trace_nfs4_setclientid(clp, status);
5084         dprintk("NFS reply setclientid: %d\n", status);
5085         return status;
5086 }
5087
5088 /**
5089  * nfs4_proc_setclientid_confirm - Confirm client ID
5090  * @clp: state data structure
5091  * @res: result of a previous SETCLIENTID
5092  * @cred: RPC credential to use for this call
5093  *
5094  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5095  */
5096 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5097                 struct nfs4_setclientid_res *arg,
5098                 struct rpc_cred *cred)
5099 {
5100         struct rpc_message msg = {
5101                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5102                 .rpc_argp = arg,
5103                 .rpc_cred = cred,
5104         };
5105         int status;
5106
5107         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5108                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5109                 clp->cl_clientid);
5110         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5111         trace_nfs4_setclientid_confirm(clp, status);
5112         dprintk("NFS reply setclientid_confirm: %d\n", status);
5113         return status;
5114 }
5115
5116 struct nfs4_delegreturndata {
5117         struct nfs4_delegreturnargs args;
5118         struct nfs4_delegreturnres res;
5119         struct nfs_fh fh;
5120         nfs4_stateid stateid;
5121         unsigned long timestamp;
5122         struct nfs_fattr fattr;
5123         int rpc_status;
5124         struct inode *inode;
5125         bool roc;
5126         u32 roc_barrier;
5127 };
5128
5129 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5130 {
5131         struct nfs4_delegreturndata *data = calldata;
5132
5133         if (!nfs4_sequence_done(task, &data->res.seq_res))
5134                 return;
5135
5136         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5137         switch (task->tk_status) {
5138         case 0:
5139                 renew_lease(data->res.server, data->timestamp);
5140         case -NFS4ERR_ADMIN_REVOKED:
5141         case -NFS4ERR_DELEG_REVOKED:
5142         case -NFS4ERR_BAD_STATEID:
5143         case -NFS4ERR_OLD_STATEID:
5144         case -NFS4ERR_STALE_STATEID:
5145         case -NFS4ERR_EXPIRED:
5146                 task->tk_status = 0;
5147                 if (data->roc)
5148                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5149                 break;
5150         default:
5151                 if (nfs4_async_handle_error(task, data->res.server,
5152                                             NULL, NULL) == -EAGAIN) {
5153                         rpc_restart_call_prepare(task);
5154                         return;
5155                 }
5156         }
5157         data->rpc_status = task->tk_status;
5158 }
5159
5160 static void nfs4_delegreturn_release(void *calldata)
5161 {
5162         struct nfs4_delegreturndata *data = calldata;
5163
5164         if (data->roc)
5165                 pnfs_roc_release(data->inode);
5166         kfree(calldata);
5167 }
5168
5169 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5170 {
5171         struct nfs4_delegreturndata *d_data;
5172
5173         d_data = (struct nfs4_delegreturndata *)data;
5174
5175         if (d_data->roc &&
5176             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5177                 return;
5178
5179         nfs4_setup_sequence(d_data->res.server,
5180                         &d_data->args.seq_args,
5181                         &d_data->res.seq_res,
5182                         task);
5183 }
5184
5185 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5186         .rpc_call_prepare = nfs4_delegreturn_prepare,
5187         .rpc_call_done = nfs4_delegreturn_done,
5188         .rpc_release = nfs4_delegreturn_release,
5189 };
5190
5191 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5192 {
5193         struct nfs4_delegreturndata *data;
5194         struct nfs_server *server = NFS_SERVER(inode);
5195         struct rpc_task *task;
5196         struct rpc_message msg = {
5197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5198                 .rpc_cred = cred,
5199         };
5200         struct rpc_task_setup task_setup_data = {
5201                 .rpc_client = server->client,
5202                 .rpc_message = &msg,
5203                 .callback_ops = &nfs4_delegreturn_ops,
5204                 .flags = RPC_TASK_ASYNC,
5205         };
5206         int status = 0;
5207
5208         data = kzalloc(sizeof(*data), GFP_NOFS);
5209         if (data == NULL)
5210                 return -ENOMEM;
5211         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5212         data->args.fhandle = &data->fh;
5213         data->args.stateid = &data->stateid;
5214         data->args.bitmask = server->cache_consistency_bitmask;
5215         nfs_copy_fh(&data->fh, NFS_FH(inode));
5216         nfs4_stateid_copy(&data->stateid, stateid);
5217         data->res.fattr = &data->fattr;
5218         data->res.server = server;
5219         nfs_fattr_init(data->res.fattr);
5220         data->timestamp = jiffies;
5221         data->rpc_status = 0;
5222         data->inode = inode;
5223         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5224                     pnfs_roc(inode) : false;
5225
5226         task_setup_data.callback_data = data;
5227         msg.rpc_argp = &data->args;
5228         msg.rpc_resp = &data->res;
5229         task = rpc_run_task(&task_setup_data);
5230         if (IS_ERR(task))
5231                 return PTR_ERR(task);
5232         if (!issync)
5233                 goto out;
5234         status = nfs4_wait_for_completion_rpc_task(task);
5235         if (status != 0)
5236                 goto out;
5237         status = data->rpc_status;
5238         if (status == 0)
5239                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5240         else
5241                 nfs_refresh_inode(inode, &data->fattr);
5242 out:
5243         rpc_put_task(task);
5244         return status;
5245 }
5246
5247 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5248 {
5249         struct nfs_server *server = NFS_SERVER(inode);
5250         struct nfs4_exception exception = { };
5251         int err;
5252         do {
5253                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5254                 trace_nfs4_delegreturn(inode, err);
5255                 switch (err) {
5256                         case -NFS4ERR_STALE_STATEID:
5257                         case -NFS4ERR_EXPIRED:
5258                         case 0:
5259                                 return 0;
5260                 }
5261                 err = nfs4_handle_exception(server, err, &exception);
5262         } while (exception.retry);
5263         return err;
5264 }
5265
5266 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5267 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5268
5269 /*
5270  * sleep, with exponential backoff, and retry the LOCK operation.
5271  */
5272 static unsigned long
5273 nfs4_set_lock_task_retry(unsigned long timeout)
5274 {
5275         freezable_schedule_timeout_killable_unsafe(timeout);
5276         timeout <<= 1;
5277         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5278                 return NFS4_LOCK_MAXTIMEOUT;
5279         return timeout;
5280 }
5281
5282 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5283 {
5284         struct inode *inode = state->inode;
5285         struct nfs_server *server = NFS_SERVER(inode);
5286         struct nfs_client *clp = server->nfs_client;
5287         struct nfs_lockt_args arg = {
5288                 .fh = NFS_FH(inode),
5289                 .fl = request,
5290         };
5291         struct nfs_lockt_res res = {
5292                 .denied = request,
5293         };
5294         struct rpc_message msg = {
5295                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5296                 .rpc_argp       = &arg,
5297                 .rpc_resp       = &res,
5298                 .rpc_cred       = state->owner->so_cred,
5299         };
5300         struct nfs4_lock_state *lsp;
5301         int status;
5302
5303         arg.lock_owner.clientid = clp->cl_clientid;
5304         status = nfs4_set_lock_state(state, request);
5305         if (status != 0)
5306                 goto out;
5307         lsp = request->fl_u.nfs4_fl.owner;
5308         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5309         arg.lock_owner.s_dev = server->s_dev;
5310         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5311         switch (status) {
5312                 case 0:
5313                         request->fl_type = F_UNLCK;
5314                         break;
5315                 case -NFS4ERR_DENIED:
5316                         status = 0;
5317         }
5318         request->fl_ops->fl_release_private(request);
5319         request->fl_ops = NULL;
5320 out:
5321         return status;
5322 }
5323
5324 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5325 {
5326         struct nfs4_exception exception = { };
5327         int err;
5328
5329         do {
5330                 err = _nfs4_proc_getlk(state, cmd, request);
5331                 trace_nfs4_get_lock(request, state, cmd, err);
5332                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5333                                 &exception);
5334         } while (exception.retry);
5335         return err;
5336 }
5337
5338 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5339 {
5340         int res = 0;
5341         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5342                 case FL_POSIX:
5343                         res = posix_lock_file_wait(file, fl);
5344                         break;
5345                 case FL_FLOCK:
5346                         res = flock_lock_file_wait(file, fl);
5347                         break;
5348                 default:
5349                         BUG();
5350         }
5351         return res;
5352 }
5353
5354 struct nfs4_unlockdata {
5355         struct nfs_locku_args arg;
5356         struct nfs_locku_res res;
5357         struct nfs4_lock_state *lsp;
5358         struct nfs_open_context *ctx;
5359         struct file_lock fl;
5360         const struct nfs_server *server;
5361         unsigned long timestamp;
5362 };
5363
5364 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5365                 struct nfs_open_context *ctx,
5366                 struct nfs4_lock_state *lsp,
5367                 struct nfs_seqid *seqid)
5368 {
5369         struct nfs4_unlockdata *p;
5370         struct inode *inode = lsp->ls_state->inode;
5371
5372         p = kzalloc(sizeof(*p), GFP_NOFS);
5373         if (p == NULL)
5374                 return NULL;
5375         p->arg.fh = NFS_FH(inode);
5376         p->arg.fl = &p->fl;
5377         p->arg.seqid = seqid;
5378         p->res.seqid = seqid;
5379         p->arg.stateid = &lsp->ls_stateid;
5380         p->lsp = lsp;
5381         atomic_inc(&lsp->ls_count);
5382         /* Ensure we don't close file until we're done freeing locks! */
5383         p->ctx = get_nfs_open_context(ctx);
5384         memcpy(&p->fl, fl, sizeof(p->fl));
5385         p->server = NFS_SERVER(inode);
5386         return p;
5387 }
5388
5389 static void nfs4_locku_release_calldata(void *data)
5390 {
5391         struct nfs4_unlockdata *calldata = data;
5392         nfs_free_seqid(calldata->arg.seqid);
5393         nfs4_put_lock_state(calldata->lsp);
5394         put_nfs_open_context(calldata->ctx);
5395         kfree(calldata);
5396 }
5397
5398 static void nfs4_locku_done(struct rpc_task *task, void *data)
5399 {
5400         struct nfs4_unlockdata *calldata = data;
5401
5402         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5403                 return;
5404         switch (task->tk_status) {
5405                 case 0:
5406                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5407                                         &calldata->res.stateid);
5408                         renew_lease(calldata->server, calldata->timestamp);
5409                         break;
5410                 case -NFS4ERR_BAD_STATEID:
5411                 case -NFS4ERR_OLD_STATEID:
5412                 case -NFS4ERR_STALE_STATEID:
5413                 case -NFS4ERR_EXPIRED:
5414                         break;
5415                 default:
5416                         if (nfs4_async_handle_error(task, calldata->server,
5417                                                     NULL, NULL) == -EAGAIN)
5418                                 rpc_restart_call_prepare(task);
5419         }
5420         nfs_release_seqid(calldata->arg.seqid);
5421 }
5422
5423 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5424 {
5425         struct nfs4_unlockdata *calldata = data;
5426
5427         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5428                 goto out_wait;
5429         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5430                 /* Note: exit _without_ running nfs4_locku_done */
5431                 goto out_no_action;
5432         }
5433         calldata->timestamp = jiffies;
5434         if (nfs4_setup_sequence(calldata->server,
5435                                 &calldata->arg.seq_args,
5436                                 &calldata->res.seq_res,
5437                                 task) != 0)
5438                 nfs_release_seqid(calldata->arg.seqid);
5439         return;
5440 out_no_action:
5441         task->tk_action = NULL;
5442 out_wait:
5443         nfs4_sequence_done(task, &calldata->res.seq_res);
5444 }
5445
5446 static const struct rpc_call_ops nfs4_locku_ops = {
5447         .rpc_call_prepare = nfs4_locku_prepare,
5448         .rpc_call_done = nfs4_locku_done,
5449         .rpc_release = nfs4_locku_release_calldata,
5450 };
5451
5452 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5453                 struct nfs_open_context *ctx,
5454                 struct nfs4_lock_state *lsp,
5455                 struct nfs_seqid *seqid)
5456 {
5457         struct nfs4_unlockdata *data;
5458         struct rpc_message msg = {
5459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5460                 .rpc_cred = ctx->cred,
5461         };
5462         struct rpc_task_setup task_setup_data = {
5463                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5464                 .rpc_message = &msg,
5465                 .callback_ops = &nfs4_locku_ops,
5466                 .workqueue = nfsiod_workqueue,
5467                 .flags = RPC_TASK_ASYNC,
5468         };
5469
5470         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5471                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5472
5473         /* Ensure this is an unlock - when canceling a lock, the
5474          * canceled lock is passed in, and it won't be an unlock.
5475          */
5476         fl->fl_type = F_UNLCK;
5477
5478         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5479         if (data == NULL) {
5480                 nfs_free_seqid(seqid);
5481                 return ERR_PTR(-ENOMEM);
5482         }
5483
5484         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5485         msg.rpc_argp = &data->arg;
5486         msg.rpc_resp = &data->res;
5487         task_setup_data.callback_data = data;
5488         return rpc_run_task(&task_setup_data);
5489 }
5490
5491 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5492 {
5493         struct inode *inode = state->inode;
5494         struct nfs4_state_owner *sp = state->owner;
5495         struct nfs_inode *nfsi = NFS_I(inode);
5496         struct nfs_seqid *seqid;
5497         struct nfs4_lock_state *lsp;
5498         struct rpc_task *task;
5499         int status = 0;
5500         unsigned char fl_flags = request->fl_flags;
5501
5502         status = nfs4_set_lock_state(state, request);
5503         /* Unlock _before_ we do the RPC call */
5504         request->fl_flags |= FL_EXISTS;
5505         /* Exclude nfs_delegation_claim_locks() */
5506         mutex_lock(&sp->so_delegreturn_mutex);
5507         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5508         down_read(&nfsi->rwsem);
5509         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5510                 up_read(&nfsi->rwsem);
5511                 mutex_unlock(&sp->so_delegreturn_mutex);
5512                 goto out;
5513         }
5514         up_read(&nfsi->rwsem);
5515         mutex_unlock(&sp->so_delegreturn_mutex);
5516         if (status != 0)
5517                 goto out;
5518         /* Is this a delegated lock? */
5519         lsp = request->fl_u.nfs4_fl.owner;
5520         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5521                 goto out;
5522         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5523         status = -ENOMEM;
5524         if (IS_ERR(seqid))
5525                 goto out;
5526         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5527         status = PTR_ERR(task);
5528         if (IS_ERR(task))
5529                 goto out;
5530         status = nfs4_wait_for_completion_rpc_task(task);
5531         rpc_put_task(task);
5532 out:
5533         request->fl_flags = fl_flags;
5534         trace_nfs4_unlock(request, state, F_SETLK, status);
5535         return status;
5536 }
5537
5538 struct nfs4_lockdata {
5539         struct nfs_lock_args arg;
5540         struct nfs_lock_res res;
5541         struct nfs4_lock_state *lsp;
5542         struct nfs_open_context *ctx;
5543         struct file_lock fl;
5544         unsigned long timestamp;
5545         int rpc_status;
5546         int cancelled;
5547         struct nfs_server *server;
5548 };
5549
5550 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5551                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5552                 gfp_t gfp_mask)
5553 {
5554         struct nfs4_lockdata *p;
5555         struct inode *inode = lsp->ls_state->inode;
5556         struct nfs_server *server = NFS_SERVER(inode);
5557
5558         p = kzalloc(sizeof(*p), gfp_mask);
5559         if (p == NULL)
5560                 return NULL;
5561
5562         p->arg.fh = NFS_FH(inode);
5563         p->arg.fl = &p->fl;
5564         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5565         if (IS_ERR(p->arg.open_seqid))
5566                 goto out_free;
5567         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5568         if (IS_ERR(p->arg.lock_seqid))
5569                 goto out_free_seqid;
5570         p->arg.lock_stateid = &lsp->ls_stateid;
5571         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5572         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5573         p->arg.lock_owner.s_dev = server->s_dev;
5574         p->res.lock_seqid = p->arg.lock_seqid;
5575         p->lsp = lsp;
5576         p->server = server;
5577         atomic_inc(&lsp->ls_count);
5578         p->ctx = get_nfs_open_context(ctx);
5579         memcpy(&p->fl, fl, sizeof(p->fl));
5580         return p;
5581 out_free_seqid:
5582         nfs_free_seqid(p->arg.open_seqid);
5583 out_free:
5584         kfree(p);
5585         return NULL;
5586 }
5587
5588 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5589 {
5590         struct nfs4_lockdata *data = calldata;
5591         struct nfs4_state *state = data->lsp->ls_state;
5592
5593         dprintk("%s: begin!\n", __func__);
5594         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5595                 goto out_wait;
5596         /* Do we need to do an open_to_lock_owner? */
5597         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5598                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5599                         goto out_release_lock_seqid;
5600                 }
5601                 data->arg.open_stateid = &state->open_stateid;
5602                 data->arg.new_lock_owner = 1;
5603                 data->res.open_seqid = data->arg.open_seqid;
5604         } else
5605                 data->arg.new_lock_owner = 0;
5606         if (!nfs4_valid_open_stateid(state)) {
5607                 data->rpc_status = -EBADF;
5608                 task->tk_action = NULL;
5609                 goto out_release_open_seqid;
5610         }
5611         data->timestamp = jiffies;
5612         if (nfs4_setup_sequence(data->server,
5613                                 &data->arg.seq_args,
5614                                 &data->res.seq_res,
5615                                 task) == 0)
5616                 return;
5617 out_release_open_seqid:
5618         nfs_release_seqid(data->arg.open_seqid);
5619 out_release_lock_seqid:
5620         nfs_release_seqid(data->arg.lock_seqid);
5621 out_wait:
5622         nfs4_sequence_done(task, &data->res.seq_res);
5623         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5624 }
5625
5626 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5627 {
5628         struct nfs4_lockdata *data = calldata;
5629
5630         dprintk("%s: begin!\n", __func__);
5631
5632         if (!nfs4_sequence_done(task, &data->res.seq_res))
5633                 return;
5634
5635         data->rpc_status = task->tk_status;
5636         if (data->arg.new_lock_owner != 0) {
5637                 if (data->rpc_status == 0)
5638                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5639                 else
5640                         goto out;
5641         }
5642         if (data->rpc_status == 0) {
5643                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5644                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5645                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5646         }
5647 out:
5648         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5649 }
5650
5651 static void nfs4_lock_release(void *calldata)
5652 {
5653         struct nfs4_lockdata *data = calldata;
5654
5655         dprintk("%s: begin!\n", __func__);
5656         nfs_free_seqid(data->arg.open_seqid);
5657         if (data->cancelled != 0) {
5658                 struct rpc_task *task;
5659                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5660                                 data->arg.lock_seqid);
5661                 if (!IS_ERR(task))
5662                         rpc_put_task_async(task);
5663                 dprintk("%s: cancelling lock!\n", __func__);
5664         } else
5665                 nfs_free_seqid(data->arg.lock_seqid);
5666         nfs4_put_lock_state(data->lsp);
5667         put_nfs_open_context(data->ctx);
5668         kfree(data);
5669         dprintk("%s: done!\n", __func__);
5670 }
5671
5672 static const struct rpc_call_ops nfs4_lock_ops = {
5673         .rpc_call_prepare = nfs4_lock_prepare,
5674         .rpc_call_done = nfs4_lock_done,
5675         .rpc_release = nfs4_lock_release,
5676 };
5677
5678 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5679 {
5680         switch (error) {
5681         case -NFS4ERR_ADMIN_REVOKED:
5682         case -NFS4ERR_BAD_STATEID:
5683                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5684                 if (new_lock_owner != 0 ||
5685                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5686                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5687                 break;
5688         case -NFS4ERR_STALE_STATEID:
5689                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5690         case -NFS4ERR_EXPIRED:
5691                 nfs4_schedule_lease_recovery(server->nfs_client);
5692         };
5693 }
5694
5695 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5696 {
5697         struct nfs4_lockdata *data;
5698         struct rpc_task *task;
5699         struct rpc_message msg = {
5700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5701                 .rpc_cred = state->owner->so_cred,
5702         };
5703         struct rpc_task_setup task_setup_data = {
5704                 .rpc_client = NFS_CLIENT(state->inode),
5705                 .rpc_message = &msg,
5706                 .callback_ops = &nfs4_lock_ops,
5707                 .workqueue = nfsiod_workqueue,
5708                 .flags = RPC_TASK_ASYNC,
5709         };
5710         int ret;
5711
5712         dprintk("%s: begin!\n", __func__);
5713         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5714                         fl->fl_u.nfs4_fl.owner,
5715                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5716         if (data == NULL)
5717                 return -ENOMEM;
5718         if (IS_SETLKW(cmd))
5719                 data->arg.block = 1;
5720         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5721         msg.rpc_argp = &data->arg;
5722         msg.rpc_resp = &data->res;
5723         task_setup_data.callback_data = data;
5724         if (recovery_type > NFS_LOCK_NEW) {
5725                 if (recovery_type == NFS_LOCK_RECLAIM)
5726                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5727                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5728         }
5729         task = rpc_run_task(&task_setup_data);
5730         if (IS_ERR(task))
5731                 return PTR_ERR(task);
5732         ret = nfs4_wait_for_completion_rpc_task(task);
5733         if (ret == 0) {
5734                 ret = data->rpc_status;
5735                 if (ret)
5736                         nfs4_handle_setlk_error(data->server, data->lsp,
5737                                         data->arg.new_lock_owner, ret);
5738         } else
5739                 data->cancelled = 1;
5740         rpc_put_task(task);
5741         dprintk("%s: done, ret = %d!\n", __func__, ret);
5742         return ret;
5743 }
5744
5745 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5746 {
5747         struct nfs_server *server = NFS_SERVER(state->inode);
5748         struct nfs4_exception exception = {
5749                 .inode = state->inode,
5750         };
5751         int err;
5752
5753         do {
5754                 /* Cache the lock if possible... */
5755                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5756                         return 0;
5757                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5758                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5759                 if (err != -NFS4ERR_DELAY)
5760                         break;
5761                 nfs4_handle_exception(server, err, &exception);
5762         } while (exception.retry);
5763         return err;
5764 }
5765
5766 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5767 {
5768         struct nfs_server *server = NFS_SERVER(state->inode);
5769         struct nfs4_exception exception = {
5770                 .inode = state->inode,
5771         };
5772         int err;
5773
5774         err = nfs4_set_lock_state(state, request);
5775         if (err != 0)
5776                 return err;
5777         if (!recover_lost_locks) {
5778                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5779                 return 0;
5780         }
5781         do {
5782                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5783                         return 0;
5784                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5785                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5786                 switch (err) {
5787                 default:
5788                         goto out;
5789                 case -NFS4ERR_GRACE:
5790                 case -NFS4ERR_DELAY:
5791                         nfs4_handle_exception(server, err, &exception);
5792                         err = 0;
5793                 }
5794         } while (exception.retry);
5795 out:
5796         return err;
5797 }
5798
5799 #if defined(CONFIG_NFS_V4_1)
5800 /**
5801  * nfs41_check_expired_locks - possibly free a lock stateid
5802  *
5803  * @state: NFSv4 state for an inode
5804  *
5805  * Returns NFS_OK if recovery for this stateid is now finished.
5806  * Otherwise a negative NFS4ERR value is returned.
5807  */
5808 static int nfs41_check_expired_locks(struct nfs4_state *state)
5809 {
5810         int status, ret = -NFS4ERR_BAD_STATEID;
5811         struct nfs4_lock_state *lsp;
5812         struct nfs_server *server = NFS_SERVER(state->inode);
5813
5814         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5815                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5816                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5817
5818                         status = nfs41_test_stateid(server,
5819                                         &lsp->ls_stateid,
5820                                         cred);
5821                         trace_nfs4_test_lock_stateid(state, lsp, status);
5822                         if (status != NFS_OK) {
5823                                 /* Free the stateid unless the server
5824                                  * informs us the stateid is unrecognized. */
5825                                 if (status != -NFS4ERR_BAD_STATEID)
5826                                         nfs41_free_stateid(server,
5827                                                         &lsp->ls_stateid,
5828                                                         cred);
5829                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5830                                 ret = status;
5831                         }
5832                 }
5833         };
5834
5835         return ret;
5836 }
5837
5838 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5839 {
5840         int status = NFS_OK;
5841
5842         if (test_bit(LK_STATE_IN_USE, &state->flags))
5843                 status = nfs41_check_expired_locks(state);
5844         if (status != NFS_OK)
5845                 status = nfs4_lock_expired(state, request);
5846         return status;
5847 }
5848 #endif
5849
5850 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5851 {
5852         struct nfs4_state_owner *sp = state->owner;
5853         struct nfs_inode *nfsi = NFS_I(state->inode);
5854         unsigned char fl_flags = request->fl_flags;
5855         unsigned int seq;
5856         int status = -ENOLCK;
5857
5858         if ((fl_flags & FL_POSIX) &&
5859                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5860                 goto out;
5861         /* Is this a delegated open? */
5862         status = nfs4_set_lock_state(state, request);
5863         if (status != 0)
5864                 goto out;
5865         request->fl_flags |= FL_ACCESS;
5866         status = do_vfs_lock(request->fl_file, request);
5867         if (status < 0)
5868                 goto out;
5869         down_read(&nfsi->rwsem);
5870         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5871                 /* Yes: cache locks! */
5872                 /* ...but avoid races with delegation recall... */
5873                 request->fl_flags = fl_flags & ~FL_SLEEP;
5874                 status = do_vfs_lock(request->fl_file, request);
5875                 goto out_unlock;
5876         }
5877         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5878         up_read(&nfsi->rwsem);
5879         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5880         if (status != 0)
5881                 goto out;
5882         down_read(&nfsi->rwsem);
5883         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5884                 status = -NFS4ERR_DELAY;
5885                 goto out_unlock;
5886         }
5887         /* Note: we always want to sleep here! */
5888         request->fl_flags = fl_flags | FL_SLEEP;
5889         if (do_vfs_lock(request->fl_file, request) < 0)
5890                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5891                         "manager!\n", __func__);
5892 out_unlock:
5893         up_read(&nfsi->rwsem);
5894 out:
5895         request->fl_flags = fl_flags;
5896         return status;
5897 }
5898
5899 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5900 {
5901         struct nfs4_exception exception = {
5902                 .state = state,
5903                 .inode = state->inode,
5904         };
5905         int err;
5906
5907         do {
5908                 err = _nfs4_proc_setlk(state, cmd, request);
5909                 trace_nfs4_set_lock(request, state, cmd, err);
5910                 if (err == -NFS4ERR_DENIED)
5911                         err = -EAGAIN;
5912                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5913                                 err, &exception);
5914         } while (exception.retry);
5915         return err;
5916 }
5917
5918 static int
5919 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5920 {
5921         struct nfs_open_context *ctx;
5922         struct nfs4_state *state;
5923         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5924         int status;
5925
5926         /* verify open state */
5927         ctx = nfs_file_open_context(filp);
5928         state = ctx->state;
5929
5930         if (request->fl_start < 0 || request->fl_end < 0)
5931                 return -EINVAL;
5932
5933         if (IS_GETLK(cmd)) {
5934                 if (state != NULL)
5935                         return nfs4_proc_getlk(state, F_GETLK, request);
5936                 return 0;
5937         }
5938
5939         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5940                 return -EINVAL;
5941
5942         if (request->fl_type == F_UNLCK) {
5943                 if (state != NULL)
5944                         return nfs4_proc_unlck(state, cmd, request);
5945                 return 0;
5946         }
5947
5948         if (state == NULL)
5949                 return -ENOLCK;
5950         /*
5951          * Don't rely on the VFS having checked the file open mode,
5952          * since it won't do this for flock() locks.
5953          */
5954         switch (request->fl_type) {
5955         case F_RDLCK:
5956                 if (!(filp->f_mode & FMODE_READ))
5957                         return -EBADF;
5958                 break;
5959         case F_WRLCK:
5960                 if (!(filp->f_mode & FMODE_WRITE))
5961                         return -EBADF;
5962         }
5963
5964         do {
5965                 status = nfs4_proc_setlk(state, cmd, request);
5966                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5967                         break;
5968                 timeout = nfs4_set_lock_task_retry(timeout);
5969                 status = -ERESTARTSYS;
5970                 if (signalled())
5971                         break;
5972         } while(status < 0);
5973         return status;
5974 }
5975
5976 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5977 {
5978         struct nfs_server *server = NFS_SERVER(state->inode);
5979         int err;
5980
5981         err = nfs4_set_lock_state(state, fl);
5982         if (err != 0)
5983                 return err;
5984         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5985         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5986 }
5987
5988 struct nfs_release_lockowner_data {
5989         struct nfs4_lock_state *lsp;
5990         struct nfs_server *server;
5991         struct nfs_release_lockowner_args args;
5992         struct nfs_release_lockowner_res res;
5993         unsigned long timestamp;
5994 };
5995
5996 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5997 {
5998         struct nfs_release_lockowner_data *data = calldata;
5999         struct nfs_server *server = data->server;
6000         nfs40_setup_sequence(server, &data->args.seq_args,
6001                                 &data->res.seq_res, task);
6002         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6003         data->timestamp = jiffies;
6004 }
6005
6006 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6007 {
6008         struct nfs_release_lockowner_data *data = calldata;
6009         struct nfs_server *server = data->server;
6010
6011         nfs40_sequence_done(task, &data->res.seq_res);
6012
6013         switch (task->tk_status) {
6014         case 0:
6015                 renew_lease(server, data->timestamp);
6016                 break;
6017         case -NFS4ERR_STALE_CLIENTID:
6018         case -NFS4ERR_EXPIRED:
6019                 nfs4_schedule_lease_recovery(server->nfs_client);
6020                 break;
6021         case -NFS4ERR_LEASE_MOVED:
6022         case -NFS4ERR_DELAY:
6023                 if (nfs4_async_handle_error(task, server,
6024                                             NULL, NULL) == -EAGAIN)
6025                         rpc_restart_call_prepare(task);
6026         }
6027 }
6028
6029 static void nfs4_release_lockowner_release(void *calldata)
6030 {
6031         struct nfs_release_lockowner_data *data = calldata;
6032         nfs4_free_lock_state(data->server, data->lsp);
6033         kfree(calldata);
6034 }
6035
6036 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6037         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6038         .rpc_call_done = nfs4_release_lockowner_done,
6039         .rpc_release = nfs4_release_lockowner_release,
6040 };
6041
6042 static void
6043 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6044 {
6045         struct nfs_release_lockowner_data *data;
6046         struct rpc_message msg = {
6047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6048         };
6049
6050         if (server->nfs_client->cl_mvops->minor_version != 0)
6051                 return;
6052
6053         data = kmalloc(sizeof(*data), GFP_NOFS);
6054         if (!data)
6055                 return;
6056         data->lsp = lsp;
6057         data->server = server;
6058         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6059         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6060         data->args.lock_owner.s_dev = server->s_dev;
6061
6062         msg.rpc_argp = &data->args;
6063         msg.rpc_resp = &data->res;
6064         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6065         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6066 }
6067
6068 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6069
6070 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6071                                    const void *buf, size_t buflen,
6072                                    int flags, int type)
6073 {
6074         if (strcmp(key, "") != 0)
6075                 return -EINVAL;
6076
6077         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6078 }
6079
6080 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6081                                    void *buf, size_t buflen, int type)
6082 {
6083         if (strcmp(key, "") != 0)
6084                 return -EINVAL;
6085
6086         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6087 }
6088
6089 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6090                                        size_t list_len, const char *name,
6091                                        size_t name_len, int type)
6092 {
6093         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6094
6095         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6096                 return 0;
6097
6098         if (list && len <= list_len)
6099                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6100         return len;
6101 }
6102
6103 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6104 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6105 {
6106         return server->caps & NFS_CAP_SECURITY_LABEL;
6107 }
6108
6109 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6110                                    const void *buf, size_t buflen,
6111                                    int flags, int type)
6112 {
6113         if (security_ismaclabel(key))
6114                 return nfs4_set_security_label(dentry, buf, buflen);
6115
6116         return -EOPNOTSUPP;
6117 }
6118
6119 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6120                                    void *buf, size_t buflen, int type)
6121 {
6122         if (security_ismaclabel(key))
6123                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6124         return -EOPNOTSUPP;
6125 }
6126
6127 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6128                                        size_t list_len, const char *name,
6129                                        size_t name_len, int type)
6130 {
6131         size_t len = 0;
6132
6133         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6134                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6135                 if (list && len <= list_len)
6136                         security_inode_listsecurity(dentry->d_inode, list, len);
6137         }
6138         return len;
6139 }
6140
6141 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6142         .prefix = XATTR_SECURITY_PREFIX,
6143         .list   = nfs4_xattr_list_nfs4_label,
6144         .get    = nfs4_xattr_get_nfs4_label,
6145         .set    = nfs4_xattr_set_nfs4_label,
6146 };
6147 #endif
6148
6149
6150 /*
6151  * nfs_fhget will use either the mounted_on_fileid or the fileid
6152  */
6153 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6154 {
6155         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6156                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6157               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6158               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6159                 return;
6160
6161         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6162                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6163         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6164         fattr->nlink = 2;
6165 }
6166
6167 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6168                                    const struct qstr *name,
6169                                    struct nfs4_fs_locations *fs_locations,
6170                                    struct page *page)
6171 {
6172         struct nfs_server *server = NFS_SERVER(dir);
6173         u32 bitmask[3] = {
6174                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6175         };
6176         struct nfs4_fs_locations_arg args = {
6177                 .dir_fh = NFS_FH(dir),
6178                 .name = name,
6179                 .page = page,
6180                 .bitmask = bitmask,
6181         };
6182         struct nfs4_fs_locations_res res = {
6183                 .fs_locations = fs_locations,
6184         };
6185         struct rpc_message msg = {
6186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6187                 .rpc_argp = &args,
6188                 .rpc_resp = &res,
6189         };
6190         int status;
6191
6192         dprintk("%s: start\n", __func__);
6193
6194         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6195          * is not supported */
6196         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6197                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6198         else
6199                 bitmask[0] |= FATTR4_WORD0_FILEID;
6200
6201         nfs_fattr_init(&fs_locations->fattr);
6202         fs_locations->server = server;
6203         fs_locations->nlocations = 0;
6204         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6205         dprintk("%s: returned status = %d\n", __func__, status);
6206         return status;
6207 }
6208
6209 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6210                            const struct qstr *name,
6211                            struct nfs4_fs_locations *fs_locations,
6212                            struct page *page)
6213 {
6214         struct nfs4_exception exception = { };
6215         int err;
6216         do {
6217                 err = _nfs4_proc_fs_locations(client, dir, name,
6218                                 fs_locations, page);
6219                 trace_nfs4_get_fs_locations(dir, name, err);
6220                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6221                                 &exception);
6222         } while (exception.retry);
6223         return err;
6224 }
6225
6226 /*
6227  * This operation also signals the server that this client is
6228  * performing migration recovery.  The server can stop returning
6229  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6230  * appended to this compound to identify the client ID which is
6231  * performing recovery.
6232  */
6233 static int _nfs40_proc_get_locations(struct inode *inode,
6234                                      struct nfs4_fs_locations *locations,
6235                                      struct page *page, struct rpc_cred *cred)
6236 {
6237         struct nfs_server *server = NFS_SERVER(inode);
6238         struct rpc_clnt *clnt = server->client;
6239         u32 bitmask[2] = {
6240                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6241         };
6242         struct nfs4_fs_locations_arg args = {
6243                 .clientid       = server->nfs_client->cl_clientid,
6244                 .fh             = NFS_FH(inode),
6245                 .page           = page,
6246                 .bitmask        = bitmask,
6247                 .migration      = 1,            /* skip LOOKUP */
6248                 .renew          = 1,            /* append RENEW */
6249         };
6250         struct nfs4_fs_locations_res res = {
6251                 .fs_locations   = locations,
6252                 .migration      = 1,
6253                 .renew          = 1,
6254         };
6255         struct rpc_message msg = {
6256                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6257                 .rpc_argp       = &args,
6258                 .rpc_resp       = &res,
6259                 .rpc_cred       = cred,
6260         };
6261         unsigned long now = jiffies;
6262         int status;
6263
6264         nfs_fattr_init(&locations->fattr);
6265         locations->server = server;
6266         locations->nlocations = 0;
6267
6268         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6269         nfs4_set_sequence_privileged(&args.seq_args);
6270         status = nfs4_call_sync_sequence(clnt, server, &msg,
6271                                         &args.seq_args, &res.seq_res);
6272         if (status)
6273                 return status;
6274
6275         renew_lease(server, now);
6276         return 0;
6277 }
6278
6279 #ifdef CONFIG_NFS_V4_1
6280
6281 /*
6282  * This operation also signals the server that this client is
6283  * performing migration recovery.  The server can stop asserting
6284  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6285  * performing this operation is identified in the SEQUENCE
6286  * operation in this compound.
6287  *
6288  * When the client supports GETATTR(fs_locations_info), it can
6289  * be plumbed in here.
6290  */
6291 static int _nfs41_proc_get_locations(struct inode *inode,
6292                                      struct nfs4_fs_locations *locations,
6293                                      struct page *page, struct rpc_cred *cred)
6294 {
6295         struct nfs_server *server = NFS_SERVER(inode);
6296         struct rpc_clnt *clnt = server->client;
6297         u32 bitmask[2] = {
6298                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6299         };
6300         struct nfs4_fs_locations_arg args = {
6301                 .fh             = NFS_FH(inode),
6302                 .page           = page,
6303                 .bitmask        = bitmask,
6304                 .migration      = 1,            /* skip LOOKUP */
6305         };
6306         struct nfs4_fs_locations_res res = {
6307                 .fs_locations   = locations,
6308                 .migration      = 1,
6309         };
6310         struct rpc_message msg = {
6311                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6312                 .rpc_argp       = &args,
6313                 .rpc_resp       = &res,
6314                 .rpc_cred       = cred,
6315         };
6316         int status;
6317
6318         nfs_fattr_init(&locations->fattr);
6319         locations->server = server;
6320         locations->nlocations = 0;
6321
6322         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6323         nfs4_set_sequence_privileged(&args.seq_args);
6324         status = nfs4_call_sync_sequence(clnt, server, &msg,
6325                                         &args.seq_args, &res.seq_res);
6326         if (status == NFS4_OK &&
6327             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6328                 status = -NFS4ERR_LEASE_MOVED;
6329         return status;
6330 }
6331
6332 #endif  /* CONFIG_NFS_V4_1 */
6333
6334 /**
6335  * nfs4_proc_get_locations - discover locations for a migrated FSID
6336  * @inode: inode on FSID that is migrating
6337  * @locations: result of query
6338  * @page: buffer
6339  * @cred: credential to use for this operation
6340  *
6341  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6342  * operation failed, or a negative errno if a local error occurred.
6343  *
6344  * On success, "locations" is filled in, but if the server has
6345  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6346  * asserted.
6347  *
6348  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6349  * from this client that require migration recovery.
6350  */
6351 int nfs4_proc_get_locations(struct inode *inode,
6352                             struct nfs4_fs_locations *locations,
6353                             struct page *page, struct rpc_cred *cred)
6354 {
6355         struct nfs_server *server = NFS_SERVER(inode);
6356         struct nfs_client *clp = server->nfs_client;
6357         const struct nfs4_mig_recovery_ops *ops =
6358                                         clp->cl_mvops->mig_recovery_ops;
6359         struct nfs4_exception exception = { };
6360         int status;
6361
6362         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6363                 (unsigned long long)server->fsid.major,
6364                 (unsigned long long)server->fsid.minor,
6365                 clp->cl_hostname);
6366         nfs_display_fhandle(NFS_FH(inode), __func__);
6367
6368         do {
6369                 status = ops->get_locations(inode, locations, page, cred);
6370                 if (status != -NFS4ERR_DELAY)
6371                         break;
6372                 nfs4_handle_exception(server, status, &exception);
6373         } while (exception.retry);
6374         return status;
6375 }
6376
6377 /*
6378  * This operation also signals the server that this client is
6379  * performing "lease moved" recovery.  The server can stop
6380  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6381  * is appended to this compound to identify the client ID which is
6382  * performing recovery.
6383  */
6384 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6385 {
6386         struct nfs_server *server = NFS_SERVER(inode);
6387         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6388         struct rpc_clnt *clnt = server->client;
6389         struct nfs4_fsid_present_arg args = {
6390                 .fh             = NFS_FH(inode),
6391                 .clientid       = clp->cl_clientid,
6392                 .renew          = 1,            /* append RENEW */
6393         };
6394         struct nfs4_fsid_present_res res = {
6395                 .renew          = 1,
6396         };
6397         struct rpc_message msg = {
6398                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6399                 .rpc_argp       = &args,
6400                 .rpc_resp       = &res,
6401                 .rpc_cred       = cred,
6402         };
6403         unsigned long now = jiffies;
6404         int status;
6405
6406         res.fh = nfs_alloc_fhandle();
6407         if (res.fh == NULL)
6408                 return -ENOMEM;
6409
6410         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6411         nfs4_set_sequence_privileged(&args.seq_args);
6412         status = nfs4_call_sync_sequence(clnt, server, &msg,
6413                                                 &args.seq_args, &res.seq_res);
6414         nfs_free_fhandle(res.fh);
6415         if (status)
6416                 return status;
6417
6418         do_renew_lease(clp, now);
6419         return 0;
6420 }
6421
6422 #ifdef CONFIG_NFS_V4_1
6423
6424 /*
6425  * This operation also signals the server that this client is
6426  * performing "lease moved" recovery.  The server can stop asserting
6427  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6428  * this operation is identified in the SEQUENCE operation in this
6429  * compound.
6430  */
6431 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6432 {
6433         struct nfs_server *server = NFS_SERVER(inode);
6434         struct rpc_clnt *clnt = server->client;
6435         struct nfs4_fsid_present_arg args = {
6436                 .fh             = NFS_FH(inode),
6437         };
6438         struct nfs4_fsid_present_res res = {
6439         };
6440         struct rpc_message msg = {
6441                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6442                 .rpc_argp       = &args,
6443                 .rpc_resp       = &res,
6444                 .rpc_cred       = cred,
6445         };
6446         int status;
6447
6448         res.fh = nfs_alloc_fhandle();
6449         if (res.fh == NULL)
6450                 return -ENOMEM;
6451
6452         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6453         nfs4_set_sequence_privileged(&args.seq_args);
6454         status = nfs4_call_sync_sequence(clnt, server, &msg,
6455                                                 &args.seq_args, &res.seq_res);
6456         nfs_free_fhandle(res.fh);
6457         if (status == NFS4_OK &&
6458             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6459                 status = -NFS4ERR_LEASE_MOVED;
6460         return status;
6461 }
6462
6463 #endif  /* CONFIG_NFS_V4_1 */
6464
6465 /**
6466  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6467  * @inode: inode on FSID to check
6468  * @cred: credential to use for this operation
6469  *
6470  * Server indicates whether the FSID is present, moved, or not
6471  * recognized.  This operation is necessary to clear a LEASE_MOVED
6472  * condition for this client ID.
6473  *
6474  * Returns NFS4_OK if the FSID is present on this server,
6475  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6476  *  NFS4ERR code if some error occurred on the server, or a
6477  *  negative errno if a local failure occurred.
6478  */
6479 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6480 {
6481         struct nfs_server *server = NFS_SERVER(inode);
6482         struct nfs_client *clp = server->nfs_client;
6483         const struct nfs4_mig_recovery_ops *ops =
6484                                         clp->cl_mvops->mig_recovery_ops;
6485         struct nfs4_exception exception = { };
6486         int status;
6487
6488         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6489                 (unsigned long long)server->fsid.major,
6490                 (unsigned long long)server->fsid.minor,
6491                 clp->cl_hostname);
6492         nfs_display_fhandle(NFS_FH(inode), __func__);
6493
6494         do {
6495                 status = ops->fsid_present(inode, cred);
6496                 if (status != -NFS4ERR_DELAY)
6497                         break;
6498                 nfs4_handle_exception(server, status, &exception);
6499         } while (exception.retry);
6500         return status;
6501 }
6502
6503 /**
6504  * If 'use_integrity' is true and the state managment nfs_client
6505  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6506  * and the machine credential as per RFC3530bis and RFC5661 Security
6507  * Considerations sections. Otherwise, just use the user cred with the
6508  * filesystem's rpc_client.
6509  */
6510 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6511 {
6512         int status;
6513         struct nfs4_secinfo_arg args = {
6514                 .dir_fh = NFS_FH(dir),
6515                 .name   = name,
6516         };
6517         struct nfs4_secinfo_res res = {
6518                 .flavors     = flavors,
6519         };
6520         struct rpc_message msg = {
6521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6522                 .rpc_argp = &args,
6523                 .rpc_resp = &res,
6524         };
6525         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6526         struct rpc_cred *cred = NULL;
6527
6528         if (use_integrity) {
6529                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6530                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6531                 msg.rpc_cred = cred;
6532         }
6533
6534         dprintk("NFS call  secinfo %s\n", name->name);
6535
6536         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6537                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6538
6539         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6540                                 &res.seq_res, 0);
6541         dprintk("NFS reply  secinfo: %d\n", status);
6542
6543         if (cred)
6544                 put_rpccred(cred);
6545
6546         return status;
6547 }
6548
6549 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6550                       struct nfs4_secinfo_flavors *flavors)
6551 {
6552         struct nfs4_exception exception = { };
6553         int err;
6554         do {
6555                 err = -NFS4ERR_WRONGSEC;
6556
6557                 /* try to use integrity protection with machine cred */
6558                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6559                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6560
6561                 /*
6562                  * if unable to use integrity protection, or SECINFO with
6563                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6564                  * disallowed by spec, but exists in deployed servers) use
6565                  * the current filesystem's rpc_client and the user cred.
6566                  */
6567                 if (err == -NFS4ERR_WRONGSEC)
6568                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6569
6570                 trace_nfs4_secinfo(dir, name, err);
6571                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6572                                 &exception);
6573         } while (exception.retry);
6574         return err;
6575 }
6576
6577 #ifdef CONFIG_NFS_V4_1
6578 /*
6579  * Check the exchange flags returned by the server for invalid flags, having
6580  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6581  * DS flags set.
6582  */
6583 static int nfs4_check_cl_exchange_flags(u32 flags)
6584 {
6585         if (flags & ~EXCHGID4_FLAG_MASK_R)
6586                 goto out_inval;
6587         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6588             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6589                 goto out_inval;
6590         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6591                 goto out_inval;
6592         return NFS_OK;
6593 out_inval:
6594         return -NFS4ERR_INVAL;
6595 }
6596
6597 static bool
6598 nfs41_same_server_scope(struct nfs41_server_scope *a,
6599                         struct nfs41_server_scope *b)
6600 {
6601         if (a->server_scope_sz == b->server_scope_sz &&
6602             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6603                 return true;
6604
6605         return false;
6606 }
6607
6608 /*
6609  * nfs4_proc_bind_conn_to_session()
6610  *
6611  * The 4.1 client currently uses the same TCP connection for the
6612  * fore and backchannel.
6613  */
6614 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6615 {
6616         int status;
6617         struct nfs41_bind_conn_to_session_res res;
6618         struct rpc_message msg = {
6619                 .rpc_proc =
6620                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6621                 .rpc_argp = clp,
6622                 .rpc_resp = &res,
6623                 .rpc_cred = cred,
6624         };
6625
6626         dprintk("--> %s\n", __func__);
6627
6628         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6629         if (unlikely(res.session == NULL)) {
6630                 status = -ENOMEM;
6631                 goto out;
6632         }
6633
6634         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6635         trace_nfs4_bind_conn_to_session(clp, status);
6636         if (status == 0) {
6637                 if (memcmp(res.session->sess_id.data,
6638                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6639                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6640                         status = -EIO;
6641                         goto out_session;
6642                 }
6643                 if (res.dir != NFS4_CDFS4_BOTH) {
6644                         dprintk("NFS: %s: Unexpected direction from server\n",
6645                                 __func__);
6646                         status = -EIO;
6647                         goto out_session;
6648                 }
6649                 if (res.use_conn_in_rdma_mode) {
6650                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6651                                 __func__);
6652                         status = -EIO;
6653                         goto out_session;
6654                 }
6655         }
6656 out_session:
6657         kfree(res.session);
6658 out:
6659         dprintk("<-- %s status= %d\n", __func__, status);
6660         return status;
6661 }
6662
6663 /*
6664  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6665  * and operations we'd like to see to enable certain features in the allow map
6666  */
6667 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6668         .how = SP4_MACH_CRED,
6669         .enforce.u.words = {
6670                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6671                       1 << (OP_EXCHANGE_ID - 32) |
6672                       1 << (OP_CREATE_SESSION - 32) |
6673                       1 << (OP_DESTROY_SESSION - 32) |
6674                       1 << (OP_DESTROY_CLIENTID - 32)
6675         },
6676         .allow.u.words = {
6677                 [0] = 1 << (OP_CLOSE) |
6678                       1 << (OP_LOCKU) |
6679                       1 << (OP_COMMIT),
6680                 [1] = 1 << (OP_SECINFO - 32) |
6681                       1 << (OP_SECINFO_NO_NAME - 32) |
6682                       1 << (OP_TEST_STATEID - 32) |
6683                       1 << (OP_FREE_STATEID - 32) |
6684                       1 << (OP_WRITE - 32)
6685         }
6686 };
6687
6688 /*
6689  * Select the state protection mode for client `clp' given the server results
6690  * from exchange_id in `sp'.
6691  *
6692  * Returns 0 on success, negative errno otherwise.
6693  */
6694 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6695                                  struct nfs41_state_protection *sp)
6696 {
6697         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6698                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6699                       1 << (OP_EXCHANGE_ID - 32) |
6700                       1 << (OP_CREATE_SESSION - 32) |
6701                       1 << (OP_DESTROY_SESSION - 32) |
6702                       1 << (OP_DESTROY_CLIENTID - 32)
6703         };
6704         unsigned int i;
6705
6706         if (sp->how == SP4_MACH_CRED) {
6707                 /* Print state protect result */
6708                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6709                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6710                         if (test_bit(i, sp->enforce.u.longs))
6711                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6712                         if (test_bit(i, sp->allow.u.longs))
6713                                 dfprintk(MOUNT, "  allow op %d\n", i);
6714                 }
6715
6716                 /* make sure nothing is on enforce list that isn't supported */
6717                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6718                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6719                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6720                                 return -EINVAL;
6721                         }
6722                 }
6723
6724                 /*
6725                  * Minimal mode - state operations are allowed to use machine
6726                  * credential.  Note this already happens by default, so the
6727                  * client doesn't have to do anything more than the negotiation.
6728                  *
6729                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6730                  *       we're already using the machine cred for exchange_id
6731                  *       and will never use a different cred.
6732                  */
6733                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6734                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6735                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6736                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6737                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6738                         dfprintk(MOUNT, "  minimal mode enabled\n");
6739                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6740                 } else {
6741                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6742                         return -EINVAL;
6743                 }
6744
6745                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6746                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6747                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6748                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6749                 }
6750
6751                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6752                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6753                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6754                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6755                 }
6756
6757                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6758                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6759                         dfprintk(MOUNT, "  stateid mode enabled\n");
6760                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6761                 }
6762
6763                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6764                         dfprintk(MOUNT, "  write mode enabled\n");
6765                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6766                 }
6767
6768                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6769                         dfprintk(MOUNT, "  commit mode enabled\n");
6770                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6771                 }
6772         }
6773
6774         return 0;
6775 }
6776
6777 /*
6778  * _nfs4_proc_exchange_id()
6779  *
6780  * Wrapper for EXCHANGE_ID operation.
6781  */
6782 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6783         u32 sp4_how)
6784 {
6785         nfs4_verifier verifier;
6786         struct nfs41_exchange_id_args args = {
6787                 .verifier = &verifier,
6788                 .client = clp,
6789 #ifdef CONFIG_NFS_V4_1_MIGRATION
6790                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6791                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6792                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6793 #else
6794                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6795                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6796 #endif
6797         };
6798         struct nfs41_exchange_id_res res = {
6799                 0
6800         };
6801         int status;
6802         struct rpc_message msg = {
6803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6804                 .rpc_argp = &args,
6805                 .rpc_resp = &res,
6806                 .rpc_cred = cred,
6807         };
6808
6809         nfs4_init_boot_verifier(clp, &verifier);
6810         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6811                                                         sizeof(args.id));
6812         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6813                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6814                 args.id_len, args.id);
6815
6816         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6817                                         GFP_NOFS);
6818         if (unlikely(res.server_owner == NULL)) {
6819                 status = -ENOMEM;
6820                 goto out;
6821         }
6822
6823         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6824                                         GFP_NOFS);
6825         if (unlikely(res.server_scope == NULL)) {
6826                 status = -ENOMEM;
6827                 goto out_server_owner;
6828         }
6829
6830         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6831         if (unlikely(res.impl_id == NULL)) {
6832                 status = -ENOMEM;
6833                 goto out_server_scope;
6834         }
6835
6836         switch (sp4_how) {
6837         case SP4_NONE:
6838                 args.state_protect.how = SP4_NONE;
6839                 break;
6840
6841         case SP4_MACH_CRED:
6842                 args.state_protect = nfs4_sp4_mach_cred_request;
6843                 break;
6844
6845         default:
6846                 /* unsupported! */
6847                 WARN_ON_ONCE(1);
6848                 status = -EINVAL;
6849                 goto out_server_scope;
6850         }
6851
6852         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6853         trace_nfs4_exchange_id(clp, status);
6854         if (status == 0)
6855                 status = nfs4_check_cl_exchange_flags(res.flags);
6856
6857         if (status == 0)
6858                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6859
6860         if (status == 0) {
6861                 clp->cl_clientid = res.clientid;
6862                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6863                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6864                         clp->cl_seqid = res.seqid;
6865
6866                 kfree(clp->cl_serverowner);
6867                 clp->cl_serverowner = res.server_owner;
6868                 res.server_owner = NULL;
6869
6870                 /* use the most recent implementation id */
6871                 kfree(clp->cl_implid);
6872                 clp->cl_implid = res.impl_id;
6873
6874                 if (clp->cl_serverscope != NULL &&
6875                     !nfs41_same_server_scope(clp->cl_serverscope,
6876                                              res.server_scope)) {
6877                         dprintk("%s: server_scope mismatch detected\n",
6878                                 __func__);
6879                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6880                         kfree(clp->cl_serverscope);
6881                         clp->cl_serverscope = NULL;
6882                 }
6883
6884                 if (clp->cl_serverscope == NULL) {
6885                         clp->cl_serverscope = res.server_scope;
6886                         goto out;
6887                 }
6888         } else
6889                 kfree(res.impl_id);
6890
6891 out_server_owner:
6892         kfree(res.server_owner);
6893 out_server_scope:
6894         kfree(res.server_scope);
6895 out:
6896         if (clp->cl_implid != NULL)
6897                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6898                         "domain: %s, name: %s, date: %llu,%u\n",
6899                         clp->cl_implid->domain, clp->cl_implid->name,
6900                         clp->cl_implid->date.seconds,
6901                         clp->cl_implid->date.nseconds);
6902         dprintk("NFS reply exchange_id: %d\n", status);
6903         return status;
6904 }
6905
6906 /*
6907  * nfs4_proc_exchange_id()
6908  *
6909  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6910  *
6911  * Since the clientid has expired, all compounds using sessions
6912  * associated with the stale clientid will be returning
6913  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6914  * be in some phase of session reset.
6915  *
6916  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6917  */
6918 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6919 {
6920         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6921         int status;
6922
6923         /* try SP4_MACH_CRED if krb5i/p */
6924         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6925             authflavor == RPC_AUTH_GSS_KRB5P) {
6926                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6927                 if (!status)
6928                         return 0;
6929         }
6930
6931         /* try SP4_NONE */
6932         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6933 }
6934
6935 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6936                 struct rpc_cred *cred)
6937 {
6938         struct rpc_message msg = {
6939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6940                 .rpc_argp = clp,
6941                 .rpc_cred = cred,
6942         };
6943         int status;
6944
6945         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6946         trace_nfs4_destroy_clientid(clp, status);
6947         if (status)
6948                 dprintk("NFS: Got error %d from the server %s on "
6949                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6950         return status;
6951 }
6952
6953 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6954                 struct rpc_cred *cred)
6955 {
6956         unsigned int loop;
6957         int ret;
6958
6959         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6960                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6961                 switch (ret) {
6962                 case -NFS4ERR_DELAY:
6963                 case -NFS4ERR_CLIENTID_BUSY:
6964                         ssleep(1);
6965                         break;
6966                 default:
6967                         return ret;
6968                 }
6969         }
6970         return 0;
6971 }
6972
6973 int nfs4_destroy_clientid(struct nfs_client *clp)
6974 {
6975         struct rpc_cred *cred;
6976         int ret = 0;
6977
6978         if (clp->cl_mvops->minor_version < 1)
6979                 goto out;
6980         if (clp->cl_exchange_flags == 0)
6981                 goto out;
6982         if (clp->cl_preserve_clid)
6983                 goto out;
6984         cred = nfs4_get_clid_cred(clp);
6985         ret = nfs4_proc_destroy_clientid(clp, cred);
6986         if (cred)
6987                 put_rpccred(cred);
6988         switch (ret) {
6989         case 0:
6990         case -NFS4ERR_STALE_CLIENTID:
6991                 clp->cl_exchange_flags = 0;
6992         }
6993 out:
6994         return ret;
6995 }
6996
6997 struct nfs4_get_lease_time_data {
6998         struct nfs4_get_lease_time_args *args;
6999         struct nfs4_get_lease_time_res *res;
7000         struct nfs_client *clp;
7001 };
7002
7003 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7004                                         void *calldata)
7005 {
7006         struct nfs4_get_lease_time_data *data =
7007                         (struct nfs4_get_lease_time_data *)calldata;
7008
7009         dprintk("--> %s\n", __func__);
7010         /* just setup sequence, do not trigger session recovery
7011            since we're invoked within one */
7012         nfs41_setup_sequence(data->clp->cl_session,
7013                         &data->args->la_seq_args,
7014                         &data->res->lr_seq_res,
7015                         task);
7016         dprintk("<-- %s\n", __func__);
7017 }
7018
7019 /*
7020  * Called from nfs4_state_manager thread for session setup, so don't recover
7021  * from sequence operation or clientid errors.
7022  */
7023 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7024 {
7025         struct nfs4_get_lease_time_data *data =
7026                         (struct nfs4_get_lease_time_data *)calldata;
7027
7028         dprintk("--> %s\n", __func__);
7029         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7030                 return;
7031         switch (task->tk_status) {
7032         case -NFS4ERR_DELAY:
7033         case -NFS4ERR_GRACE:
7034                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7035                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7036                 task->tk_status = 0;
7037                 /* fall through */
7038         case -NFS4ERR_RETRY_UNCACHED_REP:
7039                 rpc_restart_call_prepare(task);
7040                 return;
7041         }
7042         dprintk("<-- %s\n", __func__);
7043 }
7044
7045 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7046         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7047         .rpc_call_done = nfs4_get_lease_time_done,
7048 };
7049
7050 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7051 {
7052         struct rpc_task *task;
7053         struct nfs4_get_lease_time_args args;
7054         struct nfs4_get_lease_time_res res = {
7055                 .lr_fsinfo = fsinfo,
7056         };
7057         struct nfs4_get_lease_time_data data = {
7058                 .args = &args,
7059                 .res = &res,
7060                 .clp = clp,
7061         };
7062         struct rpc_message msg = {
7063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7064                 .rpc_argp = &args,
7065                 .rpc_resp = &res,
7066         };
7067         struct rpc_task_setup task_setup = {
7068                 .rpc_client = clp->cl_rpcclient,
7069                 .rpc_message = &msg,
7070                 .callback_ops = &nfs4_get_lease_time_ops,
7071                 .callback_data = &data,
7072                 .flags = RPC_TASK_TIMEOUT,
7073         };
7074         int status;
7075
7076         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7077         nfs4_set_sequence_privileged(&args.la_seq_args);
7078         dprintk("--> %s\n", __func__);
7079         task = rpc_run_task(&task_setup);
7080
7081         if (IS_ERR(task))
7082                 status = PTR_ERR(task);
7083         else {
7084                 status = task->tk_status;
7085                 rpc_put_task(task);
7086         }
7087         dprintk("<-- %s return %d\n", __func__, status);
7088
7089         return status;
7090 }
7091
7092 /*
7093  * Initialize the values to be used by the client in CREATE_SESSION
7094  * If nfs4_init_session set the fore channel request and response sizes,
7095  * use them.
7096  *
7097  * Set the back channel max_resp_sz_cached to zero to force the client to
7098  * always set csa_cachethis to FALSE because the current implementation
7099  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7100  */
7101 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7102 {
7103         unsigned int max_rqst_sz, max_resp_sz;
7104
7105         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7106         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7107
7108         /* Fore channel attributes */
7109         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7110         args->fc_attrs.max_resp_sz = max_resp_sz;
7111         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7112         args->fc_attrs.max_reqs = max_session_slots;
7113
7114         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7115                 "max_ops=%u max_reqs=%u\n",
7116                 __func__,
7117                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7118                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7119
7120         /* Back channel attributes */
7121         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7122         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7123         args->bc_attrs.max_resp_sz_cached = 0;
7124         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7125         args->bc_attrs.max_reqs = 1;
7126
7127         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7128                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7129                 __func__,
7130                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7131                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7132                 args->bc_attrs.max_reqs);
7133 }
7134
7135 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7136 {
7137         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7138         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7139
7140         if (rcvd->max_resp_sz > sent->max_resp_sz)
7141                 return -EINVAL;
7142         /*
7143          * Our requested max_ops is the minimum we need; we're not
7144          * prepared to break up compounds into smaller pieces than that.
7145          * So, no point even trying to continue if the server won't
7146          * cooperate:
7147          */
7148         if (rcvd->max_ops < sent->max_ops)
7149                 return -EINVAL;
7150         if (rcvd->max_reqs == 0)
7151                 return -EINVAL;
7152         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7153                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7154         return 0;
7155 }
7156
7157 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7158 {
7159         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7160         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7161
7162         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7163                 return -EINVAL;
7164         if (rcvd->max_resp_sz < sent->max_resp_sz)
7165                 return -EINVAL;
7166         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7167                 return -EINVAL;
7168         /* These would render the backchannel useless: */
7169         if (rcvd->max_ops != sent->max_ops)
7170                 return -EINVAL;
7171         if (rcvd->max_reqs != sent->max_reqs)
7172                 return -EINVAL;
7173         return 0;
7174 }
7175
7176 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7177                                      struct nfs4_session *session)
7178 {
7179         int ret;
7180
7181         ret = nfs4_verify_fore_channel_attrs(args, session);
7182         if (ret)
7183                 return ret;
7184         return nfs4_verify_back_channel_attrs(args, session);
7185 }
7186
7187 static int _nfs4_proc_create_session(struct nfs_client *clp,
7188                 struct rpc_cred *cred)
7189 {
7190         struct nfs4_session *session = clp->cl_session;
7191         struct nfs41_create_session_args args = {
7192                 .client = clp,
7193                 .cb_program = NFS4_CALLBACK,
7194         };
7195         struct nfs41_create_session_res res = {
7196                 .client = clp,
7197         };
7198         struct rpc_message msg = {
7199                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7200                 .rpc_argp = &args,
7201                 .rpc_resp = &res,
7202                 .rpc_cred = cred,
7203         };
7204         int status;
7205
7206         nfs4_init_channel_attrs(&args);
7207         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7208
7209         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7210         trace_nfs4_create_session(clp, status);
7211
7212         if (!status) {
7213                 /* Verify the session's negotiated channel_attrs values */
7214                 status = nfs4_verify_channel_attrs(&args, session);
7215                 /* Increment the clientid slot sequence id */
7216                 clp->cl_seqid++;
7217         }
7218
7219         return status;
7220 }
7221
7222 /*
7223  * Issues a CREATE_SESSION operation to the server.
7224  * It is the responsibility of the caller to verify the session is
7225  * expired before calling this routine.
7226  */
7227 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7228 {
7229         int status;
7230         unsigned *ptr;
7231         struct nfs4_session *session = clp->cl_session;
7232
7233         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7234
7235         status = _nfs4_proc_create_session(clp, cred);
7236         if (status)
7237                 goto out;
7238
7239         /* Init or reset the session slot tables */
7240         status = nfs4_setup_session_slot_tables(session);
7241         dprintk("slot table setup returned %d\n", status);
7242         if (status)
7243                 goto out;
7244
7245         ptr = (unsigned *)&session->sess_id.data[0];
7246         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7247                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7248 out:
7249         dprintk("<-- %s\n", __func__);
7250         return status;
7251 }
7252
7253 /*
7254  * Issue the over-the-wire RPC DESTROY_SESSION.
7255  * The caller must serialize access to this routine.
7256  */
7257 int nfs4_proc_destroy_session(struct nfs4_session *session,
7258                 struct rpc_cred *cred)
7259 {
7260         struct rpc_message msg = {
7261                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7262                 .rpc_argp = session,
7263                 .rpc_cred = cred,
7264         };
7265         int status = 0;
7266
7267         dprintk("--> nfs4_proc_destroy_session\n");
7268
7269         /* session is still being setup */
7270         if (session->clp->cl_cons_state != NFS_CS_READY)
7271                 return status;
7272
7273         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7274         trace_nfs4_destroy_session(session->clp, status);
7275
7276         if (status)
7277                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7278                         "Session has been destroyed regardless...\n", status);
7279
7280         dprintk("<-- nfs4_proc_destroy_session\n");
7281         return status;
7282 }
7283
7284 /*
7285  * Renew the cl_session lease.
7286  */
7287 struct nfs4_sequence_data {
7288         struct nfs_client *clp;
7289         struct nfs4_sequence_args args;
7290         struct nfs4_sequence_res res;
7291 };
7292
7293 static void nfs41_sequence_release(void *data)
7294 {
7295         struct nfs4_sequence_data *calldata = data;
7296         struct nfs_client *clp = calldata->clp;
7297
7298         if (atomic_read(&clp->cl_count) > 1)
7299                 nfs4_schedule_state_renewal(clp);
7300         nfs_put_client(clp);
7301         kfree(calldata);
7302 }
7303
7304 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7305 {
7306         switch(task->tk_status) {
7307         case -NFS4ERR_DELAY:
7308                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7309                 return -EAGAIN;
7310         default:
7311                 nfs4_schedule_lease_recovery(clp);
7312         }
7313         return 0;
7314 }
7315
7316 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7317 {
7318         struct nfs4_sequence_data *calldata = data;
7319         struct nfs_client *clp = calldata->clp;
7320
7321         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7322                 return;
7323
7324         trace_nfs4_sequence(clp, task->tk_status);
7325         if (task->tk_status < 0) {
7326                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7327                 if (atomic_read(&clp->cl_count) == 1)
7328                         goto out;
7329
7330                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7331                         rpc_restart_call_prepare(task);
7332                         return;
7333                 }
7334         }
7335         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7336 out:
7337         dprintk("<-- %s\n", __func__);
7338 }
7339
7340 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7341 {
7342         struct nfs4_sequence_data *calldata = data;
7343         struct nfs_client *clp = calldata->clp;
7344         struct nfs4_sequence_args *args;
7345         struct nfs4_sequence_res *res;
7346
7347         args = task->tk_msg.rpc_argp;
7348         res = task->tk_msg.rpc_resp;
7349
7350         nfs41_setup_sequence(clp->cl_session, args, res, task);
7351 }
7352
7353 static const struct rpc_call_ops nfs41_sequence_ops = {
7354         .rpc_call_done = nfs41_sequence_call_done,
7355         .rpc_call_prepare = nfs41_sequence_prepare,
7356         .rpc_release = nfs41_sequence_release,
7357 };
7358
7359 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7360                 struct rpc_cred *cred,
7361                 bool is_privileged)
7362 {
7363         struct nfs4_sequence_data *calldata;
7364         struct rpc_message msg = {
7365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7366                 .rpc_cred = cred,
7367         };
7368         struct rpc_task_setup task_setup_data = {
7369                 .rpc_client = clp->cl_rpcclient,
7370                 .rpc_message = &msg,
7371                 .callback_ops = &nfs41_sequence_ops,
7372                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7373         };
7374
7375         if (!atomic_inc_not_zero(&clp->cl_count))
7376                 return ERR_PTR(-EIO);
7377         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7378         if (calldata == NULL) {
7379                 nfs_put_client(clp);
7380                 return ERR_PTR(-ENOMEM);
7381         }
7382         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7383         if (is_privileged)
7384                 nfs4_set_sequence_privileged(&calldata->args);
7385         msg.rpc_argp = &calldata->args;
7386         msg.rpc_resp = &calldata->res;
7387         calldata->clp = clp;
7388         task_setup_data.callback_data = calldata;
7389
7390         return rpc_run_task(&task_setup_data);
7391 }
7392
7393 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7394 {
7395         struct rpc_task *task;
7396         int ret = 0;
7397
7398         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7399                 return -EAGAIN;
7400         task = _nfs41_proc_sequence(clp, cred, false);
7401         if (IS_ERR(task))
7402                 ret = PTR_ERR(task);
7403         else
7404                 rpc_put_task_async(task);
7405         dprintk("<-- %s status=%d\n", __func__, ret);
7406         return ret;
7407 }
7408
7409 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7410 {
7411         struct rpc_task *task;
7412         int ret;
7413
7414         task = _nfs41_proc_sequence(clp, cred, true);
7415         if (IS_ERR(task)) {
7416                 ret = PTR_ERR(task);
7417                 goto out;
7418         }
7419         ret = rpc_wait_for_completion_task(task);
7420         if (!ret) {
7421                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7422
7423                 if (task->tk_status == 0)
7424                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7425                 ret = task->tk_status;
7426         }
7427         rpc_put_task(task);
7428 out:
7429         dprintk("<-- %s status=%d\n", __func__, ret);
7430         return ret;
7431 }
7432
7433 struct nfs4_reclaim_complete_data {
7434         struct nfs_client *clp;
7435         struct nfs41_reclaim_complete_args arg;
7436         struct nfs41_reclaim_complete_res res;
7437 };
7438
7439 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7440 {
7441         struct nfs4_reclaim_complete_data *calldata = data;
7442
7443         nfs41_setup_sequence(calldata->clp->cl_session,
7444                         &calldata->arg.seq_args,
7445                         &calldata->res.seq_res,
7446                         task);
7447 }
7448
7449 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7450 {
7451         switch(task->tk_status) {
7452         case 0:
7453         case -NFS4ERR_COMPLETE_ALREADY:
7454         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7455                 break;
7456         case -NFS4ERR_DELAY:
7457                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7458                 /* fall through */
7459         case -NFS4ERR_RETRY_UNCACHED_REP:
7460                 return -EAGAIN;
7461         default:
7462                 nfs4_schedule_lease_recovery(clp);
7463         }
7464         return 0;
7465 }
7466
7467 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7468 {
7469         struct nfs4_reclaim_complete_data *calldata = data;
7470         struct nfs_client *clp = calldata->clp;
7471         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7472
7473         dprintk("--> %s\n", __func__);
7474         if (!nfs41_sequence_done(task, res))
7475                 return;
7476
7477         trace_nfs4_reclaim_complete(clp, task->tk_status);
7478         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7479                 rpc_restart_call_prepare(task);
7480                 return;
7481         }
7482         dprintk("<-- %s\n", __func__);
7483 }
7484
7485 static void nfs4_free_reclaim_complete_data(void *data)
7486 {
7487         struct nfs4_reclaim_complete_data *calldata = data;
7488
7489         kfree(calldata);
7490 }
7491
7492 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7493         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7494         .rpc_call_done = nfs4_reclaim_complete_done,
7495         .rpc_release = nfs4_free_reclaim_complete_data,
7496 };
7497
7498 /*
7499  * Issue a global reclaim complete.
7500  */
7501 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7502                 struct rpc_cred *cred)
7503 {
7504         struct nfs4_reclaim_complete_data *calldata;
7505         struct rpc_task *task;
7506         struct rpc_message msg = {
7507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7508                 .rpc_cred = cred,
7509         };
7510         struct rpc_task_setup task_setup_data = {
7511                 .rpc_client = clp->cl_rpcclient,
7512                 .rpc_message = &msg,
7513                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7514                 .flags = RPC_TASK_ASYNC,
7515         };
7516         int status = -ENOMEM;
7517
7518         dprintk("--> %s\n", __func__);
7519         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7520         if (calldata == NULL)
7521                 goto out;
7522         calldata->clp = clp;
7523         calldata->arg.one_fs = 0;
7524
7525         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7526         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7527         msg.rpc_argp = &calldata->arg;
7528         msg.rpc_resp = &calldata->res;
7529         task_setup_data.callback_data = calldata;
7530         task = rpc_run_task(&task_setup_data);
7531         if (IS_ERR(task)) {
7532                 status = PTR_ERR(task);
7533                 goto out;
7534         }
7535         status = nfs4_wait_for_completion_rpc_task(task);
7536         if (status == 0)
7537                 status = task->tk_status;
7538         rpc_put_task(task);
7539         return 0;
7540 out:
7541         dprintk("<-- %s status=%d\n", __func__, status);
7542         return status;
7543 }
7544
7545 static void
7546 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7547 {
7548         struct nfs4_layoutget *lgp = calldata;
7549         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7550         struct nfs4_session *session = nfs4_get_session(server);
7551
7552         dprintk("--> %s\n", __func__);
7553         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7554          * right now covering the LAYOUTGET we are about to send.
7555          * However, that is not so catastrophic, and there seems
7556          * to be no way to prevent it completely.
7557          */
7558         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7559                                 &lgp->res.seq_res, task))
7560                 return;
7561         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7562                                           NFS_I(lgp->args.inode)->layout,
7563                                           lgp->args.ctx->state)) {
7564                 rpc_exit(task, NFS4_OK);
7565         }
7566 }
7567
7568 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7569 {
7570         struct nfs4_layoutget *lgp = calldata;
7571         struct inode *inode = lgp->args.inode;
7572         struct nfs_server *server = NFS_SERVER(inode);
7573         struct pnfs_layout_hdr *lo;
7574         struct nfs4_state *state = NULL;
7575         unsigned long timeo, now, giveup;
7576
7577         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7578
7579         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7580                 goto out;
7581
7582         switch (task->tk_status) {
7583         case 0:
7584                 goto out;
7585         /*
7586          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7587          * (or clients) writing to the same RAID stripe
7588          */
7589         case -NFS4ERR_LAYOUTTRYLATER:
7590         /*
7591          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7592          * existing layout before getting a new one).
7593          */
7594         case -NFS4ERR_RECALLCONFLICT:
7595                 timeo = rpc_get_timeout(task->tk_client);
7596                 giveup = lgp->args.timestamp + timeo;
7597                 now = jiffies;
7598                 if (time_after(giveup, now)) {
7599                         unsigned long delay;
7600
7601                         /* Delay for:
7602                          * - Not less then NFS4_POLL_RETRY_MIN.
7603                          * - One last time a jiffie before we give up
7604                          * - exponential backoff (time_now minus start_attempt)
7605                          */
7606                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7607                                     min((giveup - now - 1),
7608                                         now - lgp->args.timestamp));
7609
7610                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7611                                 __func__, delay);
7612                         rpc_delay(task, delay);
7613                         task->tk_status = 0;
7614                         rpc_restart_call_prepare(task);
7615                         goto out; /* Do not call nfs4_async_handle_error() */
7616                 }
7617                 break;
7618         case -NFS4ERR_EXPIRED:
7619         case -NFS4ERR_BAD_STATEID:
7620                 spin_lock(&inode->i_lock);
7621                 lo = NFS_I(inode)->layout;
7622                 if (!lo || list_empty(&lo->plh_segs)) {
7623                         spin_unlock(&inode->i_lock);
7624                         /* If the open stateid was bad, then recover it. */
7625                         state = lgp->args.ctx->state;
7626                 } else {
7627                         LIST_HEAD(head);
7628
7629                         /*
7630                          * Mark the bad layout state as invalid, then retry
7631                          * with the current stateid.
7632                          */
7633                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7634                         spin_unlock(&inode->i_lock);
7635                         pnfs_free_lseg_list(&head);
7636
7637                         task->tk_status = 0;
7638                         rpc_restart_call_prepare(task);
7639                 }
7640         }
7641         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7642                 rpc_restart_call_prepare(task);
7643 out:
7644         dprintk("<-- %s\n", __func__);
7645 }
7646
7647 static size_t max_response_pages(struct nfs_server *server)
7648 {
7649         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7650         return nfs_page_array_len(0, max_resp_sz);
7651 }
7652
7653 static void nfs4_free_pages(struct page **pages, size_t size)
7654 {
7655         int i;
7656
7657         if (!pages)
7658                 return;
7659
7660         for (i = 0; i < size; i++) {
7661                 if (!pages[i])
7662                         break;
7663                 __free_page(pages[i]);
7664         }
7665         kfree(pages);
7666 }
7667
7668 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7669 {
7670         struct page **pages;
7671         int i;
7672
7673         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7674         if (!pages) {
7675                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7676                 return NULL;
7677         }
7678
7679         for (i = 0; i < size; i++) {
7680                 pages[i] = alloc_page(gfp_flags);
7681                 if (!pages[i]) {
7682                         dprintk("%s: failed to allocate page\n", __func__);
7683                         nfs4_free_pages(pages, size);
7684                         return NULL;
7685                 }
7686         }
7687
7688         return pages;
7689 }
7690
7691 static void nfs4_layoutget_release(void *calldata)
7692 {
7693         struct nfs4_layoutget *lgp = calldata;
7694         struct inode *inode = lgp->args.inode;
7695         struct nfs_server *server = NFS_SERVER(inode);
7696         size_t max_pages = max_response_pages(server);
7697
7698         dprintk("--> %s\n", __func__);
7699         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7700         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7701         put_nfs_open_context(lgp->args.ctx);
7702         kfree(calldata);
7703         dprintk("<-- %s\n", __func__);
7704 }
7705
7706 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7707         .rpc_call_prepare = nfs4_layoutget_prepare,
7708         .rpc_call_done = nfs4_layoutget_done,
7709         .rpc_release = nfs4_layoutget_release,
7710 };
7711
7712 struct pnfs_layout_segment *
7713 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7714 {
7715         struct inode *inode = lgp->args.inode;
7716         struct nfs_server *server = NFS_SERVER(inode);
7717         size_t max_pages = max_response_pages(server);
7718         struct rpc_task *task;
7719         struct rpc_message msg = {
7720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7721                 .rpc_argp = &lgp->args,
7722                 .rpc_resp = &lgp->res,
7723                 .rpc_cred = lgp->cred,
7724         };
7725         struct rpc_task_setup task_setup_data = {
7726                 .rpc_client = server->client,
7727                 .rpc_message = &msg,
7728                 .callback_ops = &nfs4_layoutget_call_ops,
7729                 .callback_data = lgp,
7730                 .flags = RPC_TASK_ASYNC,
7731         };
7732         struct pnfs_layout_segment *lseg = NULL;
7733         int status = 0;
7734
7735         dprintk("--> %s\n", __func__);
7736
7737         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7738         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7739
7740         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7741         if (!lgp->args.layout.pages) {
7742                 nfs4_layoutget_release(lgp);
7743                 return ERR_PTR(-ENOMEM);
7744         }
7745         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7746         lgp->args.timestamp = jiffies;
7747
7748         lgp->res.layoutp = &lgp->args.layout;
7749         lgp->res.seq_res.sr_slot = NULL;
7750         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7751
7752         task = rpc_run_task(&task_setup_data);
7753         if (IS_ERR(task))
7754                 return ERR_CAST(task);
7755         status = nfs4_wait_for_completion_rpc_task(task);
7756         if (status == 0)
7757                 status = task->tk_status;
7758         trace_nfs4_layoutget(lgp->args.ctx,
7759                         &lgp->args.range,
7760                         &lgp->res.range,
7761                         status);
7762         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7763         if (status == 0 && lgp->res.layoutp->len)
7764                 lseg = pnfs_layout_process(lgp);
7765         rpc_put_task(task);
7766         dprintk("<-- %s status=%d\n", __func__, status);
7767         if (status)
7768                 return ERR_PTR(status);
7769         return lseg;
7770 }
7771
7772 static void
7773 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7774 {
7775         struct nfs4_layoutreturn *lrp = calldata;
7776
7777         dprintk("--> %s\n", __func__);
7778         nfs41_setup_sequence(lrp->clp->cl_session,
7779                         &lrp->args.seq_args,
7780                         &lrp->res.seq_res,
7781                         task);
7782 }
7783
7784 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7785 {
7786         struct nfs4_layoutreturn *lrp = calldata;
7787         struct nfs_server *server;
7788
7789         dprintk("--> %s\n", __func__);
7790
7791         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7792                 return;
7793
7794         server = NFS_SERVER(lrp->args.inode);
7795         switch (task->tk_status) {
7796         default:
7797                 task->tk_status = 0;
7798         case 0:
7799                 break;
7800         case -NFS4ERR_DELAY:
7801                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7802                         break;
7803                 rpc_restart_call_prepare(task);
7804                 return;
7805         }
7806         dprintk("<-- %s\n", __func__);
7807 }
7808
7809 static void nfs4_layoutreturn_release(void *calldata)
7810 {
7811         struct nfs4_layoutreturn *lrp = calldata;
7812         struct pnfs_layout_hdr *lo = lrp->args.layout;
7813
7814         dprintk("--> %s\n", __func__);
7815         spin_lock(&lo->plh_inode->i_lock);
7816         if (lrp->res.lrs_present)
7817                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7818         lo->plh_block_lgets--;
7819         spin_unlock(&lo->plh_inode->i_lock);
7820         pnfs_put_layout_hdr(lrp->args.layout);
7821         kfree(calldata);
7822         dprintk("<-- %s\n", __func__);
7823 }
7824
7825 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7826         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7827         .rpc_call_done = nfs4_layoutreturn_done,
7828         .rpc_release = nfs4_layoutreturn_release,
7829 };
7830
7831 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7832 {
7833         struct rpc_task *task;
7834         struct rpc_message msg = {
7835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7836                 .rpc_argp = &lrp->args,
7837                 .rpc_resp = &lrp->res,
7838                 .rpc_cred = lrp->cred,
7839         };
7840         struct rpc_task_setup task_setup_data = {
7841                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7842                 .rpc_message = &msg,
7843                 .callback_ops = &nfs4_layoutreturn_call_ops,
7844                 .callback_data = lrp,
7845         };
7846         int status;
7847
7848         dprintk("--> %s\n", __func__);
7849         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7850         task = rpc_run_task(&task_setup_data);
7851         if (IS_ERR(task))
7852                 return PTR_ERR(task);
7853         status = task->tk_status;
7854         trace_nfs4_layoutreturn(lrp->args.inode, status);
7855         dprintk("<-- %s status=%d\n", __func__, status);
7856         rpc_put_task(task);
7857         return status;
7858 }
7859
7860 static int
7861 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7862                 struct pnfs_device *pdev,
7863                 struct rpc_cred *cred)
7864 {
7865         struct nfs4_getdeviceinfo_args args = {
7866                 .pdev = pdev,
7867         };
7868         struct nfs4_getdeviceinfo_res res = {
7869                 .pdev = pdev,
7870         };
7871         struct rpc_message msg = {
7872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7873                 .rpc_argp = &args,
7874                 .rpc_resp = &res,
7875                 .rpc_cred = cred,
7876         };
7877         int status;
7878
7879         dprintk("--> %s\n", __func__);
7880         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7881         dprintk("<-- %s status=%d\n", __func__, status);
7882
7883         return status;
7884 }
7885
7886 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7887                 struct pnfs_device *pdev,
7888                 struct rpc_cred *cred)
7889 {
7890         struct nfs4_exception exception = { };
7891         int err;
7892
7893         do {
7894                 err = nfs4_handle_exception(server,
7895                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7896                                         &exception);
7897         } while (exception.retry);
7898         return err;
7899 }
7900 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7901
7902 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7903 {
7904         struct nfs4_layoutcommit_data *data = calldata;
7905         struct nfs_server *server = NFS_SERVER(data->args.inode);
7906         struct nfs4_session *session = nfs4_get_session(server);
7907
7908         nfs41_setup_sequence(session,
7909                         &data->args.seq_args,
7910                         &data->res.seq_res,
7911                         task);
7912 }
7913
7914 static void
7915 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7916 {
7917         struct nfs4_layoutcommit_data *data = calldata;
7918         struct nfs_server *server = NFS_SERVER(data->args.inode);
7919
7920         if (!nfs41_sequence_done(task, &data->res.seq_res))
7921                 return;
7922
7923         switch (task->tk_status) { /* Just ignore these failures */
7924         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7925         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7926         case -NFS4ERR_BADLAYOUT:     /* no layout */
7927         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7928                 task->tk_status = 0;
7929         case 0:
7930                 break;
7931         default:
7932                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7933                         rpc_restart_call_prepare(task);
7934                         return;
7935                 }
7936         }
7937 }
7938
7939 static void nfs4_layoutcommit_release(void *calldata)
7940 {
7941         struct nfs4_layoutcommit_data *data = calldata;
7942
7943         pnfs_cleanup_layoutcommit(data);
7944         nfs_post_op_update_inode_force_wcc(data->args.inode,
7945                                            data->res.fattr);
7946         put_rpccred(data->cred);
7947         kfree(data);
7948 }
7949
7950 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7951         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7952         .rpc_call_done = nfs4_layoutcommit_done,
7953         .rpc_release = nfs4_layoutcommit_release,
7954 };
7955
7956 int
7957 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7958 {
7959         struct rpc_message msg = {
7960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7961                 .rpc_argp = &data->args,
7962                 .rpc_resp = &data->res,
7963                 .rpc_cred = data->cred,
7964         };
7965         struct rpc_task_setup task_setup_data = {
7966                 .task = &data->task,
7967                 .rpc_client = NFS_CLIENT(data->args.inode),
7968                 .rpc_message = &msg,
7969                 .callback_ops = &nfs4_layoutcommit_ops,
7970                 .callback_data = data,
7971                 .flags = RPC_TASK_ASYNC,
7972         };
7973         struct rpc_task *task;
7974         int status = 0;
7975
7976         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7977                 "lbw: %llu inode %lu\n",
7978                 data->task.tk_pid, sync,
7979                 data->args.lastbytewritten,
7980                 data->args.inode->i_ino);
7981
7982         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7983         task = rpc_run_task(&task_setup_data);
7984         if (IS_ERR(task))
7985                 return PTR_ERR(task);
7986         if (sync == false)
7987                 goto out;
7988         status = nfs4_wait_for_completion_rpc_task(task);
7989         if (status != 0)
7990                 goto out;
7991         status = task->tk_status;
7992         trace_nfs4_layoutcommit(data->args.inode, status);
7993 out:
7994         dprintk("%s: status %d\n", __func__, status);
7995         rpc_put_task(task);
7996         return status;
7997 }
7998
7999 /**
8000  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8001  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8002  */
8003 static int
8004 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8005                     struct nfs_fsinfo *info,
8006                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8007 {
8008         struct nfs41_secinfo_no_name_args args = {
8009                 .style = SECINFO_STYLE_CURRENT_FH,
8010         };
8011         struct nfs4_secinfo_res res = {
8012                 .flavors = flavors,
8013         };
8014         struct rpc_message msg = {
8015                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8016                 .rpc_argp = &args,
8017                 .rpc_resp = &res,
8018         };
8019         struct rpc_clnt *clnt = server->client;
8020         struct rpc_cred *cred = NULL;
8021         int status;
8022
8023         if (use_integrity) {
8024                 clnt = server->nfs_client->cl_rpcclient;
8025                 cred = nfs4_get_clid_cred(server->nfs_client);
8026                 msg.rpc_cred = cred;
8027         }
8028
8029         dprintk("--> %s\n", __func__);
8030         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8031                                 &res.seq_res, 0);
8032         dprintk("<-- %s status=%d\n", __func__, status);
8033
8034         if (cred)
8035                 put_rpccred(cred);
8036
8037         return status;
8038 }
8039
8040 static int
8041 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8042                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8043 {
8044         struct nfs4_exception exception = { };
8045         int err;
8046         do {
8047                 /* first try using integrity protection */
8048                 err = -NFS4ERR_WRONGSEC;
8049
8050                 /* try to use integrity protection with machine cred */
8051                 if (_nfs4_is_integrity_protected(server->nfs_client))
8052                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8053                                                           flavors, true);
8054
8055                 /*
8056                  * if unable to use integrity protection, or SECINFO with
8057                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8058                  * disallowed by spec, but exists in deployed servers) use
8059                  * the current filesystem's rpc_client and the user cred.
8060                  */
8061                 if (err == -NFS4ERR_WRONGSEC)
8062                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8063                                                           flavors, false);
8064
8065                 switch (err) {
8066                 case 0:
8067                 case -NFS4ERR_WRONGSEC:
8068                 case -ENOTSUPP:
8069                         goto out;
8070                 default:
8071                         err = nfs4_handle_exception(server, err, &exception);
8072                 }
8073         } while (exception.retry);
8074 out:
8075         return err;
8076 }
8077
8078 static int
8079 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8080                     struct nfs_fsinfo *info)
8081 {
8082         int err;
8083         struct page *page;
8084         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8085         struct nfs4_secinfo_flavors *flavors;
8086         struct nfs4_secinfo4 *secinfo;
8087         int i;
8088
8089         page = alloc_page(GFP_KERNEL);
8090         if (!page) {
8091                 err = -ENOMEM;
8092                 goto out;
8093         }
8094
8095         flavors = page_address(page);
8096         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8097
8098         /*
8099          * Fall back on "guess and check" method if
8100          * the server doesn't support SECINFO_NO_NAME
8101          */
8102         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8103                 err = nfs4_find_root_sec(server, fhandle, info);
8104                 goto out_freepage;
8105         }
8106         if (err)
8107                 goto out_freepage;
8108
8109         for (i = 0; i < flavors->num_flavors; i++) {
8110                 secinfo = &flavors->flavors[i];
8111
8112                 switch (secinfo->flavor) {
8113                 case RPC_AUTH_NULL:
8114                 case RPC_AUTH_UNIX:
8115                 case RPC_AUTH_GSS:
8116                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8117                                         &secinfo->flavor_info);
8118                         break;
8119                 default:
8120                         flavor = RPC_AUTH_MAXFLAVOR;
8121                         break;
8122                 }
8123
8124                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8125                         flavor = RPC_AUTH_MAXFLAVOR;
8126
8127                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8128                         err = nfs4_lookup_root_sec(server, fhandle,
8129                                                    info, flavor);
8130                         if (!err)
8131                                 break;
8132                 }
8133         }
8134
8135         if (flavor == RPC_AUTH_MAXFLAVOR)
8136                 err = -EPERM;
8137
8138 out_freepage:
8139         put_page(page);
8140         if (err == -EACCES)
8141                 return -EPERM;
8142 out:
8143         return err;
8144 }
8145
8146 static int _nfs41_test_stateid(struct nfs_server *server,
8147                 nfs4_stateid *stateid,
8148                 struct rpc_cred *cred)
8149 {
8150         int status;
8151         struct nfs41_test_stateid_args args = {
8152                 .stateid = stateid,
8153         };
8154         struct nfs41_test_stateid_res res;
8155         struct rpc_message msg = {
8156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8157                 .rpc_argp = &args,
8158                 .rpc_resp = &res,
8159                 .rpc_cred = cred,
8160         };
8161         struct rpc_clnt *rpc_client = server->client;
8162
8163         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8164                 &rpc_client, &msg);
8165
8166         dprintk("NFS call  test_stateid %p\n", stateid);
8167         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8168         nfs4_set_sequence_privileged(&args.seq_args);
8169         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8170                         &args.seq_args, &res.seq_res);
8171         if (status != NFS_OK) {
8172                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8173                 return status;
8174         }
8175         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8176         return -res.status;
8177 }
8178
8179 /**
8180  * nfs41_test_stateid - perform a TEST_STATEID operation
8181  *
8182  * @server: server / transport on which to perform the operation
8183  * @stateid: state ID to test
8184  * @cred: credential
8185  *
8186  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8187  * Otherwise a negative NFS4ERR value is returned if the operation
8188  * failed or the state ID is not currently valid.
8189  */
8190 static int nfs41_test_stateid(struct nfs_server *server,
8191                 nfs4_stateid *stateid,
8192                 struct rpc_cred *cred)
8193 {
8194         struct nfs4_exception exception = { };
8195         int err;
8196         do {
8197                 err = _nfs41_test_stateid(server, stateid, cred);
8198                 if (err != -NFS4ERR_DELAY)
8199                         break;
8200                 nfs4_handle_exception(server, err, &exception);
8201         } while (exception.retry);
8202         return err;
8203 }
8204
8205 struct nfs_free_stateid_data {
8206         struct nfs_server *server;
8207         struct nfs41_free_stateid_args args;
8208         struct nfs41_free_stateid_res res;
8209 };
8210
8211 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8212 {
8213         struct nfs_free_stateid_data *data = calldata;
8214         nfs41_setup_sequence(nfs4_get_session(data->server),
8215                         &data->args.seq_args,
8216                         &data->res.seq_res,
8217                         task);
8218 }
8219
8220 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8221 {
8222         struct nfs_free_stateid_data *data = calldata;
8223
8224         nfs41_sequence_done(task, &data->res.seq_res);
8225
8226         switch (task->tk_status) {
8227         case -NFS4ERR_DELAY:
8228                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8229                         rpc_restart_call_prepare(task);
8230         }
8231 }
8232
8233 static void nfs41_free_stateid_release(void *calldata)
8234 {
8235         kfree(calldata);
8236 }
8237
8238 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8239         .rpc_call_prepare = nfs41_free_stateid_prepare,
8240         .rpc_call_done = nfs41_free_stateid_done,
8241         .rpc_release = nfs41_free_stateid_release,
8242 };
8243
8244 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8245                 nfs4_stateid *stateid,
8246                 struct rpc_cred *cred,
8247                 bool privileged)
8248 {
8249         struct rpc_message msg = {
8250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8251                 .rpc_cred = cred,
8252         };
8253         struct rpc_task_setup task_setup = {
8254                 .rpc_client = server->client,
8255                 .rpc_message = &msg,
8256                 .callback_ops = &nfs41_free_stateid_ops,
8257                 .flags = RPC_TASK_ASYNC,
8258         };
8259         struct nfs_free_stateid_data *data;
8260
8261         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8262                 &task_setup.rpc_client, &msg);
8263
8264         dprintk("NFS call  free_stateid %p\n", stateid);
8265         data = kmalloc(sizeof(*data), GFP_NOFS);
8266         if (!data)
8267                 return ERR_PTR(-ENOMEM);
8268         data->server = server;
8269         nfs4_stateid_copy(&data->args.stateid, stateid);
8270
8271         task_setup.callback_data = data;
8272
8273         msg.rpc_argp = &data->args;
8274         msg.rpc_resp = &data->res;
8275         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8276         if (privileged)
8277                 nfs4_set_sequence_privileged(&data->args.seq_args);
8278
8279         return rpc_run_task(&task_setup);
8280 }
8281
8282 /**
8283  * nfs41_free_stateid - perform a FREE_STATEID operation
8284  *
8285  * @server: server / transport on which to perform the operation
8286  * @stateid: state ID to release
8287  * @cred: credential
8288  *
8289  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8290  * negative NFS4ERR value is returned.
8291  */
8292 static int nfs41_free_stateid(struct nfs_server *server,
8293                 nfs4_stateid *stateid,
8294                 struct rpc_cred *cred)
8295 {
8296         struct rpc_task *task;
8297         int ret;
8298
8299         task = _nfs41_free_stateid(server, stateid, cred, true);
8300         if (IS_ERR(task))
8301                 return PTR_ERR(task);
8302         ret = rpc_wait_for_completion_task(task);
8303         if (!ret)
8304                 ret = task->tk_status;
8305         rpc_put_task(task);
8306         return ret;
8307 }
8308
8309 static void
8310 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8311 {
8312         struct rpc_task *task;
8313         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8314
8315         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8316         nfs4_free_lock_state(server, lsp);
8317         if (IS_ERR(task))
8318                 return;
8319         rpc_put_task(task);
8320 }
8321
8322 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8323                 const nfs4_stateid *s2)
8324 {
8325         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8326                 return false;
8327
8328         if (s1->seqid == s2->seqid)
8329                 return true;
8330         if (s1->seqid == 0 || s2->seqid == 0)
8331                 return true;
8332
8333         return false;
8334 }
8335
8336 #endif /* CONFIG_NFS_V4_1 */
8337
8338 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8339                 const nfs4_stateid *s2)
8340 {
8341         return nfs4_stateid_match(s1, s2);
8342 }
8343
8344
8345 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8346         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8347         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8348         .recover_open   = nfs4_open_reclaim,
8349         .recover_lock   = nfs4_lock_reclaim,
8350         .establish_clid = nfs4_init_clientid,
8351         .detect_trunking = nfs40_discover_server_trunking,
8352 };
8353
8354 #if defined(CONFIG_NFS_V4_1)
8355 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8356         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8357         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8358         .recover_open   = nfs4_open_reclaim,
8359         .recover_lock   = nfs4_lock_reclaim,
8360         .establish_clid = nfs41_init_clientid,
8361         .reclaim_complete = nfs41_proc_reclaim_complete,
8362         .detect_trunking = nfs41_discover_server_trunking,
8363 };
8364 #endif /* CONFIG_NFS_V4_1 */
8365
8366 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8367         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8368         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8369         .recover_open   = nfs40_open_expired,
8370         .recover_lock   = nfs4_lock_expired,
8371         .establish_clid = nfs4_init_clientid,
8372 };
8373
8374 #if defined(CONFIG_NFS_V4_1)
8375 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8376         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8377         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8378         .recover_open   = nfs41_open_expired,
8379         .recover_lock   = nfs41_lock_expired,
8380         .establish_clid = nfs41_init_clientid,
8381 };
8382 #endif /* CONFIG_NFS_V4_1 */
8383
8384 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8385         .sched_state_renewal = nfs4_proc_async_renew,
8386         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8387         .renew_lease = nfs4_proc_renew,
8388 };
8389
8390 #if defined(CONFIG_NFS_V4_1)
8391 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8392         .sched_state_renewal = nfs41_proc_async_sequence,
8393         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8394         .renew_lease = nfs4_proc_sequence,
8395 };
8396 #endif
8397
8398 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8399         .get_locations = _nfs40_proc_get_locations,
8400         .fsid_present = _nfs40_proc_fsid_present,
8401 };
8402
8403 #if defined(CONFIG_NFS_V4_1)
8404 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8405         .get_locations = _nfs41_proc_get_locations,
8406         .fsid_present = _nfs41_proc_fsid_present,
8407 };
8408 #endif  /* CONFIG_NFS_V4_1 */
8409
8410 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8411         .minor_version = 0,
8412         .init_caps = NFS_CAP_READDIRPLUS
8413                 | NFS_CAP_ATOMIC_OPEN
8414                 | NFS_CAP_CHANGE_ATTR
8415                 | NFS_CAP_POSIX_LOCK,
8416         .init_client = nfs40_init_client,
8417         .shutdown_client = nfs40_shutdown_client,
8418         .match_stateid = nfs4_match_stateid,
8419         .find_root_sec = nfs4_find_root_sec,
8420         .free_lock_state = nfs4_release_lockowner,
8421         .alloc_seqid = nfs_alloc_seqid,
8422         .call_sync_ops = &nfs40_call_sync_ops,
8423         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8424         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8425         .state_renewal_ops = &nfs40_state_renewal_ops,
8426         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8427 };
8428
8429 #if defined(CONFIG_NFS_V4_1)
8430 static struct nfs_seqid *
8431 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8432 {
8433         return NULL;
8434 }
8435
8436 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8437         .minor_version = 1,
8438         .init_caps = NFS_CAP_READDIRPLUS
8439                 | NFS_CAP_ATOMIC_OPEN
8440                 | NFS_CAP_CHANGE_ATTR
8441                 | NFS_CAP_POSIX_LOCK
8442                 | NFS_CAP_STATEID_NFSV41
8443                 | NFS_CAP_ATOMIC_OPEN_V1,
8444         .init_client = nfs41_init_client,
8445         .shutdown_client = nfs41_shutdown_client,
8446         .match_stateid = nfs41_match_stateid,
8447         .find_root_sec = nfs41_find_root_sec,
8448         .free_lock_state = nfs41_free_lock_state,
8449         .alloc_seqid = nfs_alloc_no_seqid,
8450         .call_sync_ops = &nfs41_call_sync_ops,
8451         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8452         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8453         .state_renewal_ops = &nfs41_state_renewal_ops,
8454         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8455 };
8456 #endif
8457
8458 #if defined(CONFIG_NFS_V4_2)
8459 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8460         .minor_version = 2,
8461         .init_caps = NFS_CAP_READDIRPLUS
8462                 | NFS_CAP_ATOMIC_OPEN
8463                 | NFS_CAP_CHANGE_ATTR
8464                 | NFS_CAP_POSIX_LOCK
8465                 | NFS_CAP_STATEID_NFSV41
8466                 | NFS_CAP_ATOMIC_OPEN_V1
8467                 | NFS_CAP_ALLOCATE
8468                 | NFS_CAP_DEALLOCATE
8469                 | NFS_CAP_SEEK,
8470         .init_client = nfs41_init_client,
8471         .shutdown_client = nfs41_shutdown_client,
8472         .match_stateid = nfs41_match_stateid,
8473         .find_root_sec = nfs41_find_root_sec,
8474         .free_lock_state = nfs41_free_lock_state,
8475         .call_sync_ops = &nfs41_call_sync_ops,
8476         .alloc_seqid = nfs_alloc_no_seqid,
8477         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8478         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8479         .state_renewal_ops = &nfs41_state_renewal_ops,
8480 };
8481 #endif
8482
8483 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8484         [0] = &nfs_v4_0_minor_ops,
8485 #if defined(CONFIG_NFS_V4_1)
8486         [1] = &nfs_v4_1_minor_ops,
8487 #endif
8488 #if defined(CONFIG_NFS_V4_2)
8489         [2] = &nfs_v4_2_minor_ops,
8490 #endif
8491 };
8492
8493 static const struct inode_operations nfs4_dir_inode_operations = {
8494         .create         = nfs_create,
8495         .lookup         = nfs_lookup,
8496         .atomic_open    = nfs_atomic_open,
8497         .link           = nfs_link,
8498         .unlink         = nfs_unlink,
8499         .symlink        = nfs_symlink,
8500         .mkdir          = nfs_mkdir,
8501         .rmdir          = nfs_rmdir,
8502         .mknod          = nfs_mknod,
8503         .rename         = nfs_rename,
8504         .permission     = nfs_permission,
8505         .getattr        = nfs_getattr,
8506         .setattr        = nfs_setattr,
8507         .getxattr       = generic_getxattr,
8508         .setxattr       = generic_setxattr,
8509         .listxattr      = generic_listxattr,
8510         .removexattr    = generic_removexattr,
8511 };
8512
8513 static const struct inode_operations nfs4_file_inode_operations = {
8514         .permission     = nfs_permission,
8515         .getattr        = nfs_getattr,
8516         .setattr        = nfs_setattr,
8517         .getxattr       = generic_getxattr,
8518         .setxattr       = generic_setxattr,
8519         .listxattr      = generic_listxattr,
8520         .removexattr    = generic_removexattr,
8521 };
8522
8523 const struct nfs_rpc_ops nfs_v4_clientops = {
8524         .version        = 4,                    /* protocol version */
8525         .dentry_ops     = &nfs4_dentry_operations,
8526         .dir_inode_ops  = &nfs4_dir_inode_operations,
8527         .file_inode_ops = &nfs4_file_inode_operations,
8528         .file_ops       = &nfs4_file_operations,
8529         .getroot        = nfs4_proc_get_root,
8530         .submount       = nfs4_submount,
8531         .try_mount      = nfs4_try_mount,
8532         .getattr        = nfs4_proc_getattr,
8533         .setattr        = nfs4_proc_setattr,
8534         .lookup         = nfs4_proc_lookup,
8535         .access         = nfs4_proc_access,
8536         .readlink       = nfs4_proc_readlink,
8537         .create         = nfs4_proc_create,
8538         .remove         = nfs4_proc_remove,
8539         .unlink_setup   = nfs4_proc_unlink_setup,
8540         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8541         .unlink_done    = nfs4_proc_unlink_done,
8542         .rename_setup   = nfs4_proc_rename_setup,
8543         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8544         .rename_done    = nfs4_proc_rename_done,
8545         .link           = nfs4_proc_link,
8546         .symlink        = nfs4_proc_symlink,
8547         .mkdir          = nfs4_proc_mkdir,
8548         .rmdir          = nfs4_proc_remove,
8549         .readdir        = nfs4_proc_readdir,
8550         .mknod          = nfs4_proc_mknod,
8551         .statfs         = nfs4_proc_statfs,
8552         .fsinfo         = nfs4_proc_fsinfo,
8553         .pathconf       = nfs4_proc_pathconf,
8554         .set_capabilities = nfs4_server_capabilities,
8555         .decode_dirent  = nfs4_decode_dirent,
8556         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8557         .read_setup     = nfs4_proc_read_setup,
8558         .read_done      = nfs4_read_done,
8559         .write_setup    = nfs4_proc_write_setup,
8560         .write_done     = nfs4_write_done,
8561         .commit_setup   = nfs4_proc_commit_setup,
8562         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8563         .commit_done    = nfs4_commit_done,
8564         .lock           = nfs4_proc_lock,
8565         .clear_acl_cache = nfs4_zap_acl_attr,
8566         .close_context  = nfs4_close_context,
8567         .open_context   = nfs4_atomic_open,
8568         .have_delegation = nfs4_have_delegation,
8569         .return_delegation = nfs4_inode_return_delegation,
8570         .alloc_client   = nfs4_alloc_client,
8571         .init_client    = nfs4_init_client,
8572         .free_client    = nfs4_free_client,
8573         .create_server  = nfs4_create_server,
8574         .clone_server   = nfs_clone_server,
8575 };
8576
8577 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8578         .prefix = XATTR_NAME_NFSV4_ACL,
8579         .list   = nfs4_xattr_list_nfs4_acl,
8580         .get    = nfs4_xattr_get_nfs4_acl,
8581         .set    = nfs4_xattr_set_nfs4_acl,
8582 };
8583
8584 const struct xattr_handler *nfs4_xattr_handlers[] = {
8585         &nfs4_xattr_nfs4_acl_handler,
8586 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8587         &nfs4_xattr_nfs4_label_handler,
8588 #endif
8589         NULL
8590 };
8591
8592 /*
8593  * Local variables:
8594  *  c-basic-offset: 8
8595  * End:
8596  */