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