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 *);
  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_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 318 {
 319         int res = 0;
 320
 321         might_sleep();
 322
 323         if (*timeout <= 0)
 324                 *timeout = NFS4_POLL_RETRY_MIN;
 325         if (*timeout > NFS4_POLL_RETRY_MAX)
 326                 *timeout = NFS4_POLL_RETRY_MAX;
 327         freezable_schedule_timeout_killable_unsafe(*timeout);
 328         if (fatal_signal_pending(current))
 329                 res = -ERESTARTSYS;
 330         *timeout <<= 1;
 331         return res;
 332 }
 333
 334 /* This is the error handling routine for processes that are allowed
 335  * to sleep.
 336  */
 337 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 338 {
 339         struct nfs_client *clp = server->nfs_client;
 340         struct nfs4_state *state = exception->state;
 341         struct inode *inode = exception->inode;
 342         int ret = errorcode;
 343
 344         exception->retry = 0;
 345         switch(errorcode) {
 346                 case 0:
 347                         return 0;
 348                 case -NFS4ERR_OPENMODE:
 349                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 350                                 nfs4_inode_return_delegation(inode);
 351                                 exception->retry = 1;
 352                                 return 0;
 353                         }
 354                         if (state == NULL)
 355                                 break;
 356                         ret = nfs4_schedule_stateid_recovery(server, state);
 357                         if (ret < 0)
 358                                 break;
 359                         goto wait_on_recovery;
 360                 case -NFS4ERR_DELEG_REVOKED:
 361                 case -NFS4ERR_ADMIN_REVOKED:
 362                 case -NFS4ERR_BAD_STATEID:
 363                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 364                                 nfs_remove_bad_delegation(inode);
 365                                 exception->retry = 1;
 366                                 break;
 367                         }
 368                         if (state == NULL)
 369                                 break;
 370                         ret = nfs4_schedule_stateid_recovery(server, state);
 371                         if (ret < 0)
 372                                 break;
 373                         goto wait_on_recovery;
 374                 case -NFS4ERR_EXPIRED:
 375                         if (state != NULL) {
 376                                 ret = nfs4_schedule_stateid_recovery(server, state);
 377                                 if (ret < 0)
 378                                         break;
 379                         }
 380                 case -NFS4ERR_STALE_STATEID:
 381                 case -NFS4ERR_STALE_CLIENTID:
 382                         nfs4_schedule_lease_recovery(clp);
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_MOVED:
 385                         ret = nfs4_schedule_migration_recovery(server);
 386                         if (ret < 0)
 387                                 break;
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_LEASE_MOVED:
 390                         nfs4_schedule_lease_moved_recovery(clp);
 391                         goto wait_on_recovery;
 392 #if defined(CONFIG_NFS_V4_1)
 393                 case -NFS4ERR_BADSESSION:
 394                 case -NFS4ERR_BADSLOT:
 395                 case -NFS4ERR_BAD_HIGH_SLOT:
 396                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 397                 case -NFS4ERR_DEADSESSION:
 398                 case -NFS4ERR_SEQ_FALSE_RETRY:
 399                 case -NFS4ERR_SEQ_MISORDERED:
 400                         dprintk("%s ERROR: %d Reset session\n", __func__,
 401                                 errorcode);
 402                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 403                         goto wait_on_recovery;
 404 #endif /* defined(CONFIG_NFS_V4_1) */
 405                 case -NFS4ERR_FILE_OPEN:
 406                         if (exception->timeout > HZ) {
 407                                 /* We have retried a decent amount, time to
 408                                  * fail
 409                                  */
 410                                 ret = -EBUSY;
 411                                 break;
 412                         }
 413                 case -NFS4ERR_GRACE:
 414                 case -NFS4ERR_DELAY:
 415                         ret = nfs4_delay(server->client, &exception->timeout);
 416                         if (ret != 0)
 417                                 break;
 418                 case -NFS4ERR_RETRY_UNCACHED_REP:
 419                 case -NFS4ERR_OLD_STATEID:
 420                         exception->retry = 1;
 421                         break;
 422                 case -NFS4ERR_BADOWNER:
 423                         /* The following works around a Linux server bug! */
 424                 case -NFS4ERR_BADNAME:
 425                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 426                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 427                                 exception->retry = 1;
 428                                 printk(KERN_WARNING "NFS: v4 server %s "
 429                                                 "does not accept raw "
 430                                                 "uid/gids. "
 431                                                 "Reenabling the idmapper.\n",
 432                                                 server->nfs_client->cl_hostname);
 433                         }
 434         }
 435         /* We failed to handle the error */
 436         return nfs4_map_errors(ret);
 437 wait_on_recovery:
 438         ret = nfs4_wait_clnt_recover(clp);
 439         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 440                 return -EIO;
 441         if (ret == 0)
 442                 exception->retry = 1;
 443         return ret;
 444 }
 445
 446 /*
 447  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 448  * or 'false' otherwise.
 449  */
 450 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 451 {
 452         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 453
 454         if (flavor == RPC_AUTH_GSS_KRB5I ||
 455             flavor == RPC_AUTH_GSS_KRB5P)
 456                 return true;
 457
 458         return false;
 459 }
 460
 461 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 462 {
 463         spin_lock(&clp->cl_lock);
 464         if (time_before(clp->cl_last_renewal,timestamp))
 465                 clp->cl_last_renewal = timestamp;
 466         spin_unlock(&clp->cl_lock);
 467 }
 468
 469 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 470 {
 471         do_renew_lease(server->nfs_client, timestamp);
 472 }
 473
 474 struct nfs4_call_sync_data {
 475         const struct nfs_server *seq_server;
 476         struct nfs4_sequence_args *seq_args;
 477         struct nfs4_sequence_res *seq_res;
 478 };
 479
 480 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 481                                struct nfs4_sequence_res *res, int cache_reply)
 482 {
 483         args->sa_slot = NULL;
 484         args->sa_cache_this = cache_reply;
 485         args->sa_privileged = 0;
 486
 487         res->sr_slot = NULL;
 488 }
 489
 490 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 491 {
 492         args->sa_privileged = 1;
 493 }
 494
 495 static int nfs40_setup_sequence(const struct nfs_server *server,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 501         struct nfs4_slot *slot;
 502
 503         /* slot already allocated? */
 504         if (res->sr_slot != NULL)
 505                 goto out_start;
 506
 507         spin_lock(&tbl->slot_tbl_lock);
 508         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 509                 goto out_sleep;
 510
 511         slot = nfs4_alloc_slot(tbl);
 512         if (IS_ERR(slot)) {
 513                 if (slot == ERR_PTR(-ENOMEM))
 514                         task->tk_timeout = HZ >> 2;
 515                 goto out_sleep;
 516         }
 517         spin_unlock(&tbl->slot_tbl_lock);
 518
 519         args->sa_slot = slot;
 520         res->sr_slot = slot;
 521
 522 out_start:
 523         rpc_call_start(task);
 524         return 0;
 525
 526 out_sleep:
 527         if (args->sa_privileged)
 528                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 529                                 NULL, RPC_PRIORITY_PRIVILEGED);
 530         else
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532         spin_unlock(&tbl->slot_tbl_lock);
 533         return -EAGAIN;
 534 }
 535
 536 static int nfs40_sequence_done(struct rpc_task *task,
 537                                struct nfs4_sequence_res *res)
 538 {
 539         struct nfs4_slot *slot = res->sr_slot;
 540         struct nfs4_slot_table *tbl;
 541
 542         if (slot == NULL)
 543                 goto out;
 544
 545         tbl = slot->table;
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (!nfs41_wake_and_assign_slot(tbl, slot))
 548                 nfs4_free_slot(tbl, slot);
 549         spin_unlock(&tbl->slot_tbl_lock);
 550
 551         res->sr_slot = NULL;
 552 out:
 553         return 1;
 554 }
 555
 556 #if defined(CONFIG_NFS_V4_1)
 557
 558 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 559 {
 560         struct nfs4_session *session;
 561         struct nfs4_slot_table *tbl;
 562         struct nfs4_slot *slot = res->sr_slot;
 563         bool send_new_highest_used_slotid = false;
 564
 565         tbl = slot->table;
 566         session = tbl->session;
 567
 568         spin_lock(&tbl->slot_tbl_lock);
 569         /* Be nice to the server: try to ensure that the last transmitted
 570          * value for highest_user_slotid <= target_highest_slotid
 571          */
 572         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 573                 send_new_highest_used_slotid = true;
 574
 575         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 576                 send_new_highest_used_slotid = false;
 577                 goto out_unlock;
 578         }
 579         nfs4_free_slot(tbl, slot);
 580
 581         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 582                 send_new_highest_used_slotid = false;
 583 out_unlock:
 584         spin_unlock(&tbl->slot_tbl_lock);
 585         res->sr_slot = NULL;
 586         if (send_new_highest_used_slotid)
 587                 nfs41_server_notify_highest_slotid_update(session->clp);
 588 }
 589
 590 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 591 {
 592         struct nfs4_session *session;
 593         struct nfs4_slot *slot = res->sr_slot;
 594         struct nfs_client *clp;
 595         bool interrupted = false;
 596         int ret = 1;
 597
 598         if (slot == NULL)
 599                 goto out_noaction;
 600         /* don't increment the sequence number if the task wasn't sent */
 601         if (!RPC_WAS_SENT(task))
 602                 goto out;
 603
 604         session = slot->table->session;
 605
 606         if (slot->interrupted) {
 607                 slot->interrupted = 0;
 608                 interrupted = true;
 609         }
 610
 611         trace_nfs4_sequence_done(session, res);
 612         /* Check the SEQUENCE operation status */
 613         switch (res->sr_status) {
 614         case 0:
 615                 /* Update the slot's sequence and clientid lease timer */
 616                 ++slot->seq_nr;
 617                 clp = session->clp;
 618                 do_renew_lease(clp, res->sr_timestamp);
 619                 /* Check sequence flags */
 620                 if (res->sr_status_flags != 0)
 621                         nfs4_schedule_lease_recovery(clp);
 622                 nfs41_update_target_slotid(slot->table, slot, res);
 623                 break;
 624         case 1:
 625                 /*
 626                  * sr_status remains 1 if an RPC level error occurred.
 627                  * The server may or may not have processed the sequence
 628                  * operation..
 629                  * Mark the slot as having hosted an interrupted RPC call.
 630                  */
 631                 slot->interrupted = 1;
 632                 goto out;
 633         case -NFS4ERR_DELAY:
 634                 /* The server detected a resend of the RPC call and
 635                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 636                  * of RFC5661.
 637                  */
 638                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 639                         __func__,
 640                         slot->slot_nr,
 641                         slot->seq_nr);
 642                 goto out_retry;
 643         case -NFS4ERR_BADSLOT:
 644                 /*
 645                  * The slot id we used was probably retired. Try again
 646                  * using a different slot id.
 647                  */
 648                 goto retry_nowait;
 649         case -NFS4ERR_SEQ_MISORDERED:
 650                 /*
 651                  * Was the last operation on this sequence interrupted?
 652                  * If so, retry after bumping the sequence number.
 653                  */
 654                 if (interrupted) {
 655                         ++slot->seq_nr;
 656                         goto retry_nowait;
 657                 }
 658                 /*
 659                  * Could this slot have been previously retired?
 660                  * If so, then the server may be expecting seq_nr = 1!
 661                  */
 662                 if (slot->seq_nr != 1) {
 663                         slot->seq_nr = 1;
 664                         goto retry_nowait;
 665                 }
 666                 break;
 667         case -NFS4ERR_SEQ_FALSE_RETRY:
 668                 ++slot->seq_nr;
 669                 goto retry_nowait;
 670         default:
 671                 /* Just update the slot sequence no. */
 672                 ++slot->seq_nr;
 673         }
 674 out:
 675         /* The session may be reset by one of the error handlers. */
 676         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 677         nfs41_sequence_free_slot(res);
 678 out_noaction:
 679         return ret;
 680 retry_nowait:
 681         if (rpc_restart_call_prepare(task)) {
 682                 task->tk_status = 0;
 683                 ret = 0;
 684         }
 685         goto out;
 686 out_retry:
 687         if (!rpc_restart_call(task))
 688                 goto out;
 689         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 690         return 0;
 691 }
 692 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 693
 694 static int nfs4_sequence_done(struct rpc_task *task,
 695                                struct nfs4_sequence_res *res)
 696 {
 697         if (res->sr_slot == NULL)
 698                 return 1;
 699         if (!res->sr_slot->table->session)
 700                 return nfs40_sequence_done(task, res);
 701         return nfs41_sequence_done(task, res);
 702 }
 703
 704 int nfs41_setup_sequence(struct nfs4_session *session,
 705                                 struct nfs4_sequence_args *args,
 706                                 struct nfs4_sequence_res *res,
 707                                 struct rpc_task *task)
 708 {
 709         struct nfs4_slot *slot;
 710         struct nfs4_slot_table *tbl;
 711
 712         dprintk("--> %s\n", __func__);
 713         /* slot already allocated? */
 714         if (res->sr_slot != NULL)
 715                 goto out_success;
 716
 717         tbl = &session->fc_slot_table;
 718
 719         task->tk_timeout = 0;
 720
 721         spin_lock(&tbl->slot_tbl_lock);
 722         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 723             !args->sa_privileged) {
 724                 /* The state manager will wait until the slot table is empty */
 725                 dprintk("%s session is draining\n", __func__);
 726                 goto out_sleep;
 727         }
 728
 729         slot = nfs4_alloc_slot(tbl);
 730         if (IS_ERR(slot)) {
 731                 /* If out of memory, try again in 1/4 second */
 732                 if (slot == ERR_PTR(-ENOMEM))
 733                         task->tk_timeout = HZ >> 2;
 734                 dprintk("<-- %s: no free slots\n", __func__);
 735                 goto out_sleep;
 736         }
 737         spin_unlock(&tbl->slot_tbl_lock);
 738
 739         args->sa_slot = slot;
 740
 741         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 742                         slot->slot_nr, slot->seq_nr);
 743
 744         res->sr_slot = slot;
 745         res->sr_timestamp = jiffies;
 746         res->sr_status_flags = 0;
 747         /*
 748          * sr_status is only set in decode_sequence, and so will remain
 749          * set to 1 if an rpc level failure occurs.
 750          */
 751         res->sr_status = 1;
 752         trace_nfs4_setup_sequence(session, args);
 753 out_success:
 754         rpc_call_start(task);
 755         return 0;
 756 out_sleep:
 757         /* Privileged tasks are queued with top priority */
 758         if (args->sa_privileged)
 759                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 760                                 NULL, RPC_PRIORITY_PRIVILEGED);
 761         else
 762                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 763         spin_unlock(&tbl->slot_tbl_lock);
 764         return -EAGAIN;
 765 }
 766 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 767
 768 static int nfs4_setup_sequence(const struct nfs_server *server,
 769                                struct nfs4_sequence_args *args,
 770                                struct nfs4_sequence_res *res,
 771                                struct rpc_task *task)
 772 {
 773         struct nfs4_session *session = nfs4_get_session(server);
 774         int ret = 0;
 775
 776         if (!session)
 777                 return nfs40_setup_sequence(server, args, res, task);
 778
 779         dprintk("--> %s clp %p session %p sr_slot %u\n",
 780                 __func__, session->clp, session, res->sr_slot ?
 781                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 782
 783         ret = nfs41_setup_sequence(session, args, res, task);
 784
 785         dprintk("<-- %s status=%d\n", __func__, ret);
 786         return ret;
 787 }
 788
 789 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 790 {
 791         struct nfs4_call_sync_data *data = calldata;
 792         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 793
 794         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 795
 796         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 797 }
 798
 799 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_call_sync_data *data = calldata;
 802
 803         nfs41_sequence_done(task, data->seq_res);
 804 }
 805
 806 static const struct rpc_call_ops nfs41_call_sync_ops = {
 807         .rpc_call_prepare = nfs41_call_sync_prepare,
 808         .rpc_call_done = nfs41_call_sync_done,
 809 };
 810
 811 #else   /* !CONFIG_NFS_V4_1 */
 812
 813 static int nfs4_setup_sequence(const struct nfs_server *server,
 814                                struct nfs4_sequence_args *args,
 815                                struct nfs4_sequence_res *res,
 816                                struct rpc_task *task)
 817 {
 818         return nfs40_setup_sequence(server, args, res, task);
 819 }
 820
 821 static int nfs4_sequence_done(struct rpc_task *task,
 822                                struct nfs4_sequence_res *res)
 823 {
 824         return nfs40_sequence_done(task, res);
 825 }
 826
 827 #endif  /* !CONFIG_NFS_V4_1 */
 828
 829 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 830 {
 831         struct nfs4_call_sync_data *data = calldata;
 832         nfs4_setup_sequence(data->seq_server,
 833                                 data->seq_args, data->seq_res, task);
 834 }
 835
 836 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 837 {
 838         struct nfs4_call_sync_data *data = calldata;
 839         nfs4_sequence_done(task, data->seq_res);
 840 }
 841
 842 static const struct rpc_call_ops nfs40_call_sync_ops = {
 843         .rpc_call_prepare = nfs40_call_sync_prepare,
 844         .rpc_call_done = nfs40_call_sync_done,
 845 };
 846
 847 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 848                                    struct nfs_server *server,
 849                                    struct rpc_message *msg,
 850                                    struct nfs4_sequence_args *args,
 851                                    struct nfs4_sequence_res *res)
 852 {
 853         int ret;
 854         struct rpc_task *task;
 855         struct nfs_client *clp = server->nfs_client;
 856         struct nfs4_call_sync_data data = {
 857                 .seq_server = server,
 858                 .seq_args = args,
 859                 .seq_res = res,
 860         };
 861         struct rpc_task_setup task_setup = {
 862                 .rpc_client = clnt,
 863                 .rpc_message = msg,
 864                 .callback_ops = clp->cl_mvops->call_sync_ops,
 865                 .callback_data = &data
 866         };
 867
 868         task = rpc_run_task(&task_setup);
 869         if (IS_ERR(task))
 870                 ret = PTR_ERR(task);
 871         else {
 872                 ret = task->tk_status;
 873                 rpc_put_task(task);
 874         }
 875         return ret;
 876 }
 877
 878 static
 879 int nfs4_call_sync(struct rpc_clnt *clnt,
 880                    struct nfs_server *server,
 881                    struct rpc_message *msg,
 882                    struct nfs4_sequence_args *args,
 883                    struct nfs4_sequence_res *res,
 884                    int cache_reply)
 885 {
 886         nfs4_init_sequence(args, res, cache_reply);
 887         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 888 }
 889
 890 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 891 {
 892         struct nfs_inode *nfsi = NFS_I(dir);
 893
 894         spin_lock(&dir->i_lock);
 895         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 896         if (!cinfo->atomic || cinfo->before != dir->i_version)
 897                 nfs_force_lookup_revalidate(dir);
 898         dir->i_version = cinfo->after;
 899         nfs_fscache_invalidate(dir);
 900         spin_unlock(&dir->i_lock);
 901 }
 902
 903 struct nfs4_opendata {
 904         struct kref kref;
 905         struct nfs_openargs o_arg;
 906         struct nfs_openres o_res;
 907         struct nfs_open_confirmargs c_arg;
 908         struct nfs_open_confirmres c_res;
 909         struct nfs4_string owner_name;
 910         struct nfs4_string group_name;
 911         struct nfs_fattr f_attr;
 912         struct nfs4_label *f_label;
 913         struct dentry *dir;
 914         struct dentry *dentry;
 915         struct nfs4_state_owner *owner;
 916         struct nfs4_state *state;
 917         struct iattr attrs;
 918         unsigned long timestamp;
 919         unsigned int rpc_done : 1;
 920         unsigned int file_created : 1;
 921         unsigned int is_recover : 1;
 922         int rpc_status;
 923         int cancelled;
 924 };
 925
 926 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 927                 int err, struct nfs4_exception *exception)
 928 {
 929         if (err != -EINVAL)
 930                 return false;
 931         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 932                 return false;
 933         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 934         exception->retry = 1;
 935         return true;
 936 }
 937
 938 static enum open_claim_type4
 939 nfs4_map_atomic_open_claim(struct nfs_server *server,
 940                 enum open_claim_type4 claim)
 941 {
 942         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 943                 return claim;
 944         switch (claim) {
 945         default:
 946                 return claim;
 947         case NFS4_OPEN_CLAIM_FH:
 948                 return NFS4_OPEN_CLAIM_NULL;
 949         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 950                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 951         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 953         }
 954 }
 955
 956 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 957 {
 958         p->o_res.f_attr = &p->f_attr;
 959         p->o_res.f_label = p->f_label;
 960         p->o_res.seqid = p->o_arg.seqid;
 961         p->c_res.seqid = p->c_arg.seqid;
 962         p->o_res.server = p->o_arg.server;
 963         p->o_res.access_request = p->o_arg.access;
 964         nfs_fattr_init(&p->f_attr);
 965         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 966 }
 967
 968 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 969                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 970                 const struct iattr *attrs,
 971                 struct nfs4_label *label,
 972                 enum open_claim_type4 claim,
 973                 gfp_t gfp_mask)
 974 {
 975         struct dentry *parent = dget_parent(dentry);
 976         struct inode *dir = parent->d_inode;
 977         struct nfs_server *server = NFS_SERVER(dir);
 978         struct nfs4_opendata *p;
 979
 980         p = kzalloc(sizeof(*p), gfp_mask);
 981         if (p == NULL)
 982                 goto err;
 983
 984         p->f_label = nfs4_label_alloc(server, gfp_mask);
 985         if (IS_ERR(p->f_label))
 986                 goto err_free_p;
 987
 988         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 989         if (p->o_arg.seqid == NULL)
 990                 goto err_free_label;
 991         nfs_sb_active(dentry->d_sb);
 992         p->dentry = dget(dentry);
 993         p->dir = parent;
 994         p->owner = sp;
 995         atomic_inc(&sp->so_count);
 996         p->o_arg.open_flags = flags;
 997         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 998         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 999          * will return permission denied for all bits until close */
1000         if (!(flags & O_EXCL)) {
1001                 /* ask server to check for all possible rights as results
1002                  * are cached */
1003                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1004                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1005         }
1006         p->o_arg.clientid = server->nfs_client->cl_clientid;
1007         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1008         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1009         p->o_arg.name = &dentry->d_name;
1010         p->o_arg.server = server;
1011         p->o_arg.bitmask = nfs4_bitmask(server, label);
1012         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1013         p->o_arg.label = label;
1014         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1015         switch (p->o_arg.claim) {
1016         case NFS4_OPEN_CLAIM_NULL:
1017         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1018         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1019                 p->o_arg.fh = NFS_FH(dir);
1020                 break;
1021         case NFS4_OPEN_CLAIM_PREVIOUS:
1022         case NFS4_OPEN_CLAIM_FH:
1023         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1024         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1025                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1026         }
1027         if (attrs != NULL && attrs->ia_valid != 0) {
1028                 __u32 verf[2];
1029
1030                 p->o_arg.u.attrs = &p->attrs;
1031                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1032
1033                 verf[0] = jiffies;
1034                 verf[1] = current->pid;
1035                 memcpy(p->o_arg.u.verifier.data, verf,
1036                                 sizeof(p->o_arg.u.verifier.data));
1037         }
1038         p->c_arg.fh = &p->o_res.fh;
1039         p->c_arg.stateid = &p->o_res.stateid;
1040         p->c_arg.seqid = p->o_arg.seqid;
1041         nfs4_init_opendata_res(p);
1042         kref_init(&p->kref);
1043         return p;
1044
1045 err_free_label:
1046         nfs4_label_free(p->f_label);
1047 err_free_p:
1048         kfree(p);
1049 err:
1050         dput(parent);
1051         return NULL;
1052 }
1053
1054 static void nfs4_opendata_free(struct kref *kref)
1055 {
1056         struct nfs4_opendata *p = container_of(kref,
1057                         struct nfs4_opendata, kref);
1058         struct super_block *sb = p->dentry->d_sb;
1059
1060         nfs_free_seqid(p->o_arg.seqid);
1061         if (p->state != NULL)
1062                 nfs4_put_open_state(p->state);
1063         nfs4_put_state_owner(p->owner);
1064
1065         nfs4_label_free(p->f_label);
1066
1067         dput(p->dir);
1068         dput(p->dentry);
1069         nfs_sb_deactive(sb);
1070         nfs_fattr_free_names(&p->f_attr);
1071         kfree(p->f_attr.mdsthreshold);
1072         kfree(p);
1073 }
1074
1075 static void nfs4_opendata_put(struct nfs4_opendata *p)
1076 {
1077         if (p != NULL)
1078                 kref_put(&p->kref, nfs4_opendata_free);
1079 }
1080
1081 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1082 {
1083         int ret;
1084
1085         ret = rpc_wait_for_completion_task(task);
1086         return ret;
1087 }
1088
1089 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1090 {
1091         int ret = 0;
1092
1093         if (open_mode & (O_EXCL|O_TRUNC))
1094                 goto out;
1095         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1096                 case FMODE_READ:
1097                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1098                                 && state->n_rdonly != 0;
1099                         break;
1100                 case FMODE_WRITE:
1101                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1102                                 && state->n_wronly != 0;
1103                         break;
1104                 case FMODE_READ|FMODE_WRITE:
1105                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1106                                 && state->n_rdwr != 0;
1107         }
1108 out:
1109         return ret;
1110 }
1111
1112 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1113 {
1114         if (delegation == NULL)
1115                 return 0;
1116         if ((delegation->type & fmode) != fmode)
1117                 return 0;
1118         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
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 0;
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 #if defined(CONFIG_NFS_V4_1)
2104 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2105 {
2106         struct nfs_server *server = NFS_SERVER(state->inode);
2107         nfs4_stateid *stateid = &state->stateid;
2108         struct nfs_delegation *delegation;
2109         struct rpc_cred *cred = NULL;
2110         int status = -NFS4ERR_BAD_STATEID;
2111
2112         /* If a state reset has been done, test_stateid is unneeded */
2113         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2114                 return;
2115
2116         /* Get the delegation credential for use by test/free_stateid */
2117         rcu_read_lock();
2118         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2119         if (delegation != NULL &&
2120             nfs4_stateid_match(&delegation->stateid, stateid)) {
2121                 cred = get_rpccred(delegation->cred);
2122                 rcu_read_unlock();
2123                 status = nfs41_test_stateid(server, stateid, cred);
2124                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2125         } else
2126                 rcu_read_unlock();
2127
2128         if (status != NFS_OK) {
2129                 /* Free the stateid unless the server explicitly
2130                  * informs us the stateid is unrecognized. */
2131                 if (status != -NFS4ERR_BAD_STATEID)
2132                         nfs41_free_stateid(server, stateid, cred);
2133                 nfs_remove_bad_delegation(state->inode);
2134
2135                 write_seqlock(&state->seqlock);
2136                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2137                 write_sequnlock(&state->seqlock);
2138                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2139         }
2140
2141         if (cred != NULL)
2142                 put_rpccred(cred);
2143 }
2144
2145 /**
2146  * nfs41_check_open_stateid - possibly free an open stateid
2147  *
2148  * @state: NFSv4 state for an inode
2149  *
2150  * Returns NFS_OK if recovery for this stateid is now finished.
2151  * Otherwise a negative NFS4ERR value is returned.
2152  */
2153 static int nfs41_check_open_stateid(struct nfs4_state *state)
2154 {
2155         struct nfs_server *server = NFS_SERVER(state->inode);
2156         nfs4_stateid *stateid = &state->open_stateid;
2157         struct rpc_cred *cred = state->owner->so_cred;
2158         int status;
2159
2160         /* If a state reset has been done, test_stateid is unneeded */
2161         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2162             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2163             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2164                 return -NFS4ERR_BAD_STATEID;
2165
2166         status = nfs41_test_stateid(server, stateid, cred);
2167         trace_nfs4_test_open_stateid(state, NULL, status);
2168         if (status != NFS_OK) {
2169                 /* Free the stateid unless the server explicitly
2170                  * informs us the stateid is unrecognized. */
2171                 if (status != -NFS4ERR_BAD_STATEID)
2172                         nfs41_free_stateid(server, stateid, cred);
2173
2174                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2175                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2176                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2177                 clear_bit(NFS_OPEN_STATE, &state->flags);
2178         }
2179         return status;
2180 }
2181
2182 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2183 {
2184         int status;
2185
2186         nfs41_clear_delegation_stateid(state);
2187         status = nfs41_check_open_stateid(state);
2188         if (status != NFS_OK)
2189                 status = nfs4_open_expired(sp, state);
2190         return status;
2191 }
2192 #endif
2193
2194 /*
2195  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2196  * fields corresponding to attributes that were used to store the verifier.
2197  * Make sure we clobber those fields in the later setattr call
2198  */
2199 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2200 {
2201         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2202             !(sattr->ia_valid & ATTR_ATIME_SET))
2203                 sattr->ia_valid |= ATTR_ATIME;
2204
2205         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2206             !(sattr->ia_valid & ATTR_MTIME_SET))
2207                 sattr->ia_valid |= ATTR_MTIME;
2208 }
2209
2210 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2211                 fmode_t fmode,
2212                 int flags,
2213                 struct nfs_open_context *ctx)
2214 {
2215         struct nfs4_state_owner *sp = opendata->owner;
2216         struct nfs_server *server = sp->so_server;
2217         struct dentry *dentry;
2218         struct nfs4_state *state;
2219         unsigned int seq;
2220         int ret;
2221
2222         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2223
2224         ret = _nfs4_proc_open(opendata);
2225         if (ret != 0) {
2226                 if (ret == -ENOENT) {
2227                         d_drop(opendata->dentry);
2228                         d_add(opendata->dentry, NULL);
2229                         nfs_set_verifier(opendata->dentry,
2230                                          nfs_save_change_attribute(opendata->dir->d_inode));
2231                 }
2232                 goto out;
2233         }
2234
2235         state = nfs4_opendata_to_nfs4_state(opendata);
2236         ret = PTR_ERR(state);
2237         if (IS_ERR(state))
2238                 goto out;
2239         if (server->caps & NFS_CAP_POSIX_LOCK)
2240                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2241
2242         dentry = opendata->dentry;
2243         if (dentry->d_inode == NULL) {
2244                 /* FIXME: Is this d_drop() ever needed? */
2245                 d_drop(dentry);
2246                 dentry = d_add_unique(dentry, igrab(state->inode));
2247                 if (dentry == NULL) {
2248                         dentry = opendata->dentry;
2249                 } else if (dentry != ctx->dentry) {
2250                         dput(ctx->dentry);
2251                         ctx->dentry = dget(dentry);
2252                 }
2253                 nfs_set_verifier(dentry,
2254                                 nfs_save_change_attribute(opendata->dir->d_inode));
2255         }
2256
2257         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2258         if (ret != 0)
2259                 goto out;
2260
2261         ctx->state = state;
2262         if (dentry->d_inode == state->inode) {
2263                 nfs_inode_attach_open_context(ctx);
2264                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2265                         nfs4_schedule_stateid_recovery(server, state);
2266         }
2267 out:
2268         return ret;
2269 }
2270
2271 /*
2272  * Returns a referenced nfs4_state
2273  */
2274 static int _nfs4_do_open(struct inode *dir,
2275                         struct nfs_open_context *ctx,
2276                         int flags,
2277                         struct iattr *sattr,
2278                         struct nfs4_label *label,
2279                         int *opened)
2280 {
2281         struct nfs4_state_owner  *sp;
2282         struct nfs4_state     *state = NULL;
2283         struct nfs_server       *server = NFS_SERVER(dir);
2284         struct nfs4_opendata *opendata;
2285         struct dentry *dentry = ctx->dentry;
2286         struct rpc_cred *cred = ctx->cred;
2287         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2288         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2289         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2290         struct nfs4_label *olabel = NULL;
2291         int status;
2292
2293         /* Protect against reboot recovery conflicts */
2294         status = -ENOMEM;
2295         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2296         if (sp == NULL) {
2297                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2298                 goto out_err;
2299         }
2300         status = nfs4_recover_expired_lease(server);
2301         if (status != 0)
2302                 goto err_put_state_owner;
2303         if (dentry->d_inode != NULL)
2304                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2305         status = -ENOMEM;
2306         if (dentry->d_inode)
2307                 claim = NFS4_OPEN_CLAIM_FH;
2308         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2309                         label, claim, GFP_KERNEL);
2310         if (opendata == NULL)
2311                 goto err_put_state_owner;
2312
2313         if (label) {
2314                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2315                 if (IS_ERR(olabel)) {
2316                         status = PTR_ERR(olabel);
2317                         goto err_opendata_put;
2318                 }
2319         }
2320
2321         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2322                 if (!opendata->f_attr.mdsthreshold) {
2323                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2324                         if (!opendata->f_attr.mdsthreshold)
2325                                 goto err_free_label;
2326                 }
2327                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2328         }
2329         if (dentry->d_inode != NULL)
2330                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2331
2332         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2333         if (status != 0)
2334                 goto err_free_label;
2335         state = ctx->state;
2336
2337         if ((opendata->o_arg.open_flags & O_EXCL) &&
2338             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2339                 nfs4_exclusive_attrset(opendata, sattr);
2340
2341                 nfs_fattr_init(opendata->o_res.f_attr);
2342                 status = nfs4_do_setattr(state->inode, cred,
2343                                 opendata->o_res.f_attr, sattr,
2344                                 state, label, olabel);
2345                 if (status == 0) {
2346                         nfs_setattr_update_inode(state->inode, sattr);
2347                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2348                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2349                 }
2350         }
2351         if (opendata->file_created)
2352                 *opened |= FILE_CREATED;
2353
2354         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2355                 *ctx_th = opendata->f_attr.mdsthreshold;
2356                 opendata->f_attr.mdsthreshold = NULL;
2357         }
2358
2359         nfs4_label_free(olabel);
2360
2361         nfs4_opendata_put(opendata);
2362         nfs4_put_state_owner(sp);
2363         return 0;
2364 err_free_label:
2365         nfs4_label_free(olabel);
2366 err_opendata_put:
2367         nfs4_opendata_put(opendata);
2368 err_put_state_owner:
2369         nfs4_put_state_owner(sp);
2370 out_err:
2371         return status;
2372 }
2373
2374
2375 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2376                                         struct nfs_open_context *ctx,
2377                                         int flags,
2378                                         struct iattr *sattr,
2379                                         struct nfs4_label *label,
2380                                         int *opened)
2381 {
2382         struct nfs_server *server = NFS_SERVER(dir);
2383         struct nfs4_exception exception = { };
2384         struct nfs4_state *res;
2385         int status;
2386
2387         do {
2388                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2389                 res = ctx->state;
2390                 trace_nfs4_open_file(ctx, flags, status);
2391                 if (status == 0)
2392                         break;
2393                 /* NOTE: BAD_SEQID means the server and client disagree about the
2394                  * book-keeping w.r.t. state-changing operations
2395                  * (OPEN/CLOSE/LOCK/LOCKU...)
2396                  * It is actually a sign of a bug on the client or on the server.
2397                  *
2398                  * If we receive a BAD_SEQID error in the particular case of
2399                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2400                  * have unhashed the old state_owner for us, and that we can
2401                  * therefore safely retry using a new one. We should still warn
2402                  * the user though...
2403                  */
2404                 if (status == -NFS4ERR_BAD_SEQID) {
2405                         pr_warn_ratelimited("NFS: v4 server %s "
2406                                         " returned a bad sequence-id error!\n",
2407                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2408                         exception.retry = 1;
2409                         continue;
2410                 }
2411                 /*
2412                  * BAD_STATEID on OPEN means that the server cancelled our
2413                  * state before it received the OPEN_CONFIRM.
2414                  * Recover by retrying the request as per the discussion
2415                  * on Page 181 of RFC3530.
2416                  */
2417                 if (status == -NFS4ERR_BAD_STATEID) {
2418                         exception.retry = 1;
2419                         continue;
2420                 }
2421                 if (status == -EAGAIN) {
2422                         /* We must have found a delegation */
2423                         exception.retry = 1;
2424                         continue;
2425                 }
2426                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2427                         continue;
2428                 res = ERR_PTR(nfs4_handle_exception(server,
2429                                         status, &exception));
2430         } while (exception.retry);
2431         return res;
2432 }
2433
2434 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2435                             struct nfs_fattr *fattr, struct iattr *sattr,
2436                             struct nfs4_state *state, struct nfs4_label *ilabel,
2437                             struct nfs4_label *olabel)
2438 {
2439         struct nfs_server *server = NFS_SERVER(inode);
2440         struct nfs_setattrargs  arg = {
2441                 .fh             = NFS_FH(inode),
2442                 .iap            = sattr,
2443                 .server         = server,
2444                 .bitmask = server->attr_bitmask,
2445                 .label          = ilabel,
2446         };
2447         struct nfs_setattrres  res = {
2448                 .fattr          = fattr,
2449                 .label          = olabel,
2450                 .server         = server,
2451         };
2452         struct rpc_message msg = {
2453                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2454                 .rpc_argp       = &arg,
2455                 .rpc_resp       = &res,
2456                 .rpc_cred       = cred,
2457         };
2458         unsigned long timestamp = jiffies;
2459         fmode_t fmode;
2460         bool truncate;
2461         int status;
2462
2463         arg.bitmask = nfs4_bitmask(server, ilabel);
2464         if (ilabel)
2465                 arg.bitmask = nfs4_bitmask(server, olabel);
2466
2467         nfs_fattr_init(fattr);
2468
2469         /* Servers should only apply open mode checks for file size changes */
2470         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2471         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2472
2473         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2474                 /* Use that stateid */
2475         } else if (truncate && state != NULL) {
2476                 struct nfs_lockowner lockowner = {
2477                         .l_owner = current->files,
2478                         .l_pid = current->tgid,
2479                 };
2480                 if (!nfs4_valid_open_stateid(state))
2481                         return -EBADF;
2482                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2483                                 &lockowner) == -EIO)
2484                         return -EBADF;
2485         } else
2486                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2487
2488         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2489         if (status == 0 && state != NULL)
2490                 renew_lease(server, timestamp);
2491         return status;
2492 }
2493
2494 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2495                            struct nfs_fattr *fattr, struct iattr *sattr,
2496                            struct nfs4_state *state, struct nfs4_label *ilabel,
2497                            struct nfs4_label *olabel)
2498 {
2499         struct nfs_server *server = NFS_SERVER(inode);
2500         struct nfs4_exception exception = {
2501                 .state = state,
2502                 .inode = inode,
2503         };
2504         int err;
2505         do {
2506                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2507                 trace_nfs4_setattr(inode, err);
2508                 switch (err) {
2509                 case -NFS4ERR_OPENMODE:
2510                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2511                                 pr_warn_once("NFSv4: server %s is incorrectly "
2512                                                 "applying open mode checks to "
2513                                                 "a SETATTR that is not "
2514                                                 "changing file size.\n",
2515                                                 server->nfs_client->cl_hostname);
2516                         }
2517                         if (state && !(state->state & FMODE_WRITE)) {
2518                                 err = -EBADF;
2519                                 if (sattr->ia_valid & ATTR_OPEN)
2520                                         err = -EACCES;
2521                                 goto out;
2522                         }
2523                 }
2524                 err = nfs4_handle_exception(server, err, &exception);
2525         } while (exception.retry);
2526 out:
2527         return err;
2528 }
2529
2530 struct nfs4_closedata {
2531         struct inode *inode;
2532         struct nfs4_state *state;
2533         struct nfs_closeargs arg;
2534         struct nfs_closeres res;
2535         struct nfs_fattr fattr;
2536         unsigned long timestamp;
2537         bool roc;
2538         u32 roc_barrier;
2539 };
2540
2541 static void nfs4_free_closedata(void *data)
2542 {
2543         struct nfs4_closedata *calldata = data;
2544         struct nfs4_state_owner *sp = calldata->state->owner;
2545         struct super_block *sb = calldata->state->inode->i_sb;
2546
2547         if (calldata->roc)
2548                 pnfs_roc_release(calldata->state->inode);
2549         nfs4_put_open_state(calldata->state);
2550         nfs_free_seqid(calldata->arg.seqid);
2551         nfs4_put_state_owner(sp);
2552         nfs_sb_deactive(sb);
2553         kfree(calldata);
2554 }
2555
2556 static void nfs4_close_done(struct rpc_task *task, void *data)
2557 {
2558         struct nfs4_closedata *calldata = data;
2559         struct nfs4_state *state = calldata->state;
2560         struct nfs_server *server = NFS_SERVER(calldata->inode);
2561         nfs4_stateid *res_stateid = NULL;
2562
2563         dprintk("%s: begin!\n", __func__);
2564         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2565                 return;
2566         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2567         /* hmm. we are done with the inode, and in the process of freeing
2568          * the state_owner. we keep this around to process errors
2569          */
2570         switch (task->tk_status) {
2571                 case 0:
2572                         res_stateid = &calldata->res.stateid;
2573                         if (calldata->arg.fmode == 0 && calldata->roc)
2574                                 pnfs_roc_set_barrier(state->inode,
2575                                                      calldata->roc_barrier);
2576                         renew_lease(server, calldata->timestamp);
2577                         break;
2578                 case -NFS4ERR_ADMIN_REVOKED:
2579                 case -NFS4ERR_STALE_STATEID:
2580                 case -NFS4ERR_OLD_STATEID:
2581                 case -NFS4ERR_BAD_STATEID:
2582                 case -NFS4ERR_EXPIRED:
2583                         if (calldata->arg.fmode == 0)
2584                                 break;
2585                 default:
2586                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2587                                 rpc_restart_call_prepare(task);
2588                                 goto out_release;
2589                         }
2590         }
2591         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2592 out_release:
2593         nfs_release_seqid(calldata->arg.seqid);
2594         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2595         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2596 }
2597
2598 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2599 {
2600         struct nfs4_closedata *calldata = data;
2601         struct nfs4_state *state = calldata->state;
2602         struct inode *inode = calldata->inode;
2603         bool is_rdonly, is_wronly, is_rdwr;
2604         int call_close = 0;
2605
2606         dprintk("%s: begin!\n", __func__);
2607         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2608                 goto out_wait;
2609
2610         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2611         spin_lock(&state->owner->so_lock);
2612         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2613         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2614         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2615         /* Calculate the current open share mode */
2616         calldata->arg.fmode = 0;
2617         if (is_rdonly || is_rdwr)
2618                 calldata->arg.fmode |= FMODE_READ;
2619         if (is_wronly || is_rdwr)
2620                 calldata->arg.fmode |= FMODE_WRITE;
2621         /* Calculate the change in open mode */
2622         if (state->n_rdwr == 0) {
2623                 if (state->n_rdonly == 0) {
2624                         call_close |= is_rdonly || is_rdwr;
2625                         calldata->arg.fmode &= ~FMODE_READ;
2626                 }
2627                 if (state->n_wronly == 0) {
2628                         call_close |= is_wronly || is_rdwr;
2629                         calldata->arg.fmode &= ~FMODE_WRITE;
2630                 }
2631         }
2632         if (!nfs4_valid_open_stateid(state))
2633                 call_close = 0;
2634         spin_unlock(&state->owner->so_lock);
2635
2636         if (!call_close) {
2637                 /* Note: exit _without_ calling nfs4_close_done */
2638                 goto out_no_action;
2639         }
2640
2641         if (calldata->arg.fmode == 0) {
2642                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2643                 if (calldata->roc &&
2644                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2645                         nfs_release_seqid(calldata->arg.seqid);
2646                         goto out_wait;
2647                     }
2648         }
2649
2650         nfs_fattr_init(calldata->res.fattr);
2651         calldata->timestamp = jiffies;
2652         if (nfs4_setup_sequence(NFS_SERVER(inode),
2653                                 &calldata->arg.seq_args,
2654                                 &calldata->res.seq_res,
2655                                 task) != 0)
2656                 nfs_release_seqid(calldata->arg.seqid);
2657         dprintk("%s: done!\n", __func__);
2658         return;
2659 out_no_action:
2660         task->tk_action = NULL;
2661 out_wait:
2662         nfs4_sequence_done(task, &calldata->res.seq_res);
2663 }
2664
2665 static const struct rpc_call_ops nfs4_close_ops = {
2666         .rpc_call_prepare = nfs4_close_prepare,
2667         .rpc_call_done = nfs4_close_done,
2668         .rpc_release = nfs4_free_closedata,
2669 };
2670
2671 static bool nfs4_state_has_opener(struct nfs4_state *state)
2672 {
2673         /* first check existing openers */
2674         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2675             state->n_rdonly != 0)
2676                 return true;
2677
2678         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2679             state->n_wronly != 0)
2680                 return true;
2681
2682         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2683             state->n_rdwr != 0)
2684                 return true;
2685
2686         return false;
2687 }
2688
2689 static bool nfs4_roc(struct inode *inode)
2690 {
2691         struct nfs_inode *nfsi = NFS_I(inode);
2692         struct nfs_open_context *ctx;
2693         struct nfs4_state *state;
2694
2695         spin_lock(&inode->i_lock);
2696         list_for_each_entry(ctx, &nfsi->open_files, list) {
2697                 state = ctx->state;
2698                 if (state == NULL)
2699                         continue;
2700                 if (nfs4_state_has_opener(state)) {
2701                         spin_unlock(&inode->i_lock);
2702                         return false;
2703                 }
2704         }
2705         spin_unlock(&inode->i_lock);
2706
2707         if (nfs4_check_delegation(inode, FMODE_READ))
2708                 return false;
2709
2710         return pnfs_roc(inode);
2711 }
2712
2713 /*
2714  * It is possible for data to be read/written from a mem-mapped file
2715  * after the sys_close call (which hits the vfs layer as a flush).
2716  * This means that we can't safely call nfsv4 close on a file until
2717  * the inode is cleared. This in turn means that we are not good
2718  * NFSv4 citizens - we do not indicate to the server to update the file's
2719  * share state even when we are done with one of the three share
2720  * stateid's in the inode.
2721  *
2722  * NOTE: Caller must be holding the sp->so_owner semaphore!
2723  */
2724 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2725 {
2726         struct nfs_server *server = NFS_SERVER(state->inode);
2727         struct nfs4_closedata *calldata;
2728         struct nfs4_state_owner *sp = state->owner;
2729         struct rpc_task *task;
2730         struct rpc_message msg = {
2731                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2732                 .rpc_cred = state->owner->so_cred,
2733         };
2734         struct rpc_task_setup task_setup_data = {
2735                 .rpc_client = server->client,
2736                 .rpc_message = &msg,
2737                 .callback_ops = &nfs4_close_ops,
2738                 .workqueue = nfsiod_workqueue,
2739                 .flags = RPC_TASK_ASYNC,
2740         };
2741         int status = -ENOMEM;
2742
2743         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2744                 &task_setup_data.rpc_client, &msg);
2745
2746         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2747         if (calldata == NULL)
2748                 goto out;
2749         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2750         calldata->inode = state->inode;
2751         calldata->state = state;
2752         calldata->arg.fh = NFS_FH(state->inode);
2753         calldata->arg.stateid = &state->open_stateid;
2754         /* Serialization for the sequence id */
2755         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2756         if (calldata->arg.seqid == NULL)
2757                 goto out_free_calldata;
2758         calldata->arg.fmode = 0;
2759         calldata->arg.bitmask = server->cache_consistency_bitmask;
2760         calldata->res.fattr = &calldata->fattr;
2761         calldata->res.seqid = calldata->arg.seqid;
2762         calldata->res.server = server;
2763         calldata->roc = nfs4_roc(state->inode);
2764         nfs_sb_active(calldata->inode->i_sb);
2765
2766         msg.rpc_argp = &calldata->arg;
2767         msg.rpc_resp = &calldata->res;
2768         task_setup_data.callback_data = calldata;
2769         task = rpc_run_task(&task_setup_data);
2770         if (IS_ERR(task))
2771                 return PTR_ERR(task);
2772         status = 0;
2773         if (wait)
2774                 status = rpc_wait_for_completion_task(task);
2775         rpc_put_task(task);
2776         return status;
2777 out_free_calldata:
2778         kfree(calldata);
2779 out:
2780         nfs4_put_open_state(state);
2781         nfs4_put_state_owner(sp);
2782         return status;
2783 }
2784
2785 static struct inode *
2786 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2787                 int open_flags, struct iattr *attr, int *opened)
2788 {
2789         struct nfs4_state *state;
2790         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2791
2792         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2793
2794         /* Protect against concurrent sillydeletes */
2795         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2796
2797         nfs4_label_release_security(label);
2798
2799         if (IS_ERR(state))
2800                 return ERR_CAST(state);
2801         return state->inode;
2802 }
2803
2804 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2805 {
2806         if (ctx->state == NULL)
2807                 return;
2808         if (is_sync)
2809                 nfs4_close_sync(ctx->state, ctx->mode);
2810         else
2811                 nfs4_close_state(ctx->state, ctx->mode);
2812 }
2813
2814 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2815 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2816 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2817
2818 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2819 {
2820         struct nfs4_server_caps_arg args = {
2821                 .fhandle = fhandle,
2822         };
2823         struct nfs4_server_caps_res res = {};
2824         struct rpc_message msg = {
2825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2826                 .rpc_argp = &args,
2827                 .rpc_resp = &res,
2828         };
2829         int status;
2830
2831         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2832         if (status == 0) {
2833                 /* Sanity check the server answers */
2834                 switch (server->nfs_client->cl_minorversion) {
2835                 case 0:
2836                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2837                         res.attr_bitmask[2] = 0;
2838                         break;
2839                 case 1:
2840                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2841                         break;
2842                 case 2:
2843                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2844                 }
2845                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2846                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2847                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2848                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2849                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2850                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2851                                 NFS_CAP_SECURITY_LABEL);
2852                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2853                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2854                         server->caps |= NFS_CAP_ACLS;
2855                 if (res.has_links != 0)
2856                         server->caps |= NFS_CAP_HARDLINKS;
2857                 if (res.has_symlinks != 0)
2858                         server->caps |= NFS_CAP_SYMLINKS;
2859                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2860                         server->caps |= NFS_CAP_FILEID;
2861                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2862                         server->caps |= NFS_CAP_MODE;
2863                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2864                         server->caps |= NFS_CAP_NLINK;
2865                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2866                         server->caps |= NFS_CAP_OWNER;
2867                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2868                         server->caps |= NFS_CAP_OWNER_GROUP;
2869                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2870                         server->caps |= NFS_CAP_ATIME;
2871                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2872                         server->caps |= NFS_CAP_CTIME;
2873                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2874                         server->caps |= NFS_CAP_MTIME;
2875 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2876                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2877                         server->caps |= NFS_CAP_SECURITY_LABEL;
2878 #endif
2879                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2880                                 sizeof(server->attr_bitmask));
2881                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2882
2883                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2884                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2885                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2886                 server->cache_consistency_bitmask[2] = 0;
2887                 server->acl_bitmask = res.acl_bitmask;
2888                 server->fh_expire_type = res.fh_expire_type;
2889         }
2890
2891         return status;
2892 }
2893
2894 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2895 {
2896         struct nfs4_exception exception = { };
2897         int err;
2898         do {
2899                 err = nfs4_handle_exception(server,
2900                                 _nfs4_server_capabilities(server, fhandle),
2901                                 &exception);
2902         } while (exception.retry);
2903         return err;
2904 }
2905
2906 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2907                 struct nfs_fsinfo *info)
2908 {
2909         u32 bitmask[3];
2910         struct nfs4_lookup_root_arg args = {
2911                 .bitmask = bitmask,
2912         };
2913         struct nfs4_lookup_res res = {
2914                 .server = server,
2915                 .fattr = info->fattr,
2916                 .fh = fhandle,
2917         };
2918         struct rpc_message msg = {
2919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2920                 .rpc_argp = &args,
2921                 .rpc_resp = &res,
2922         };
2923
2924         bitmask[0] = nfs4_fattr_bitmap[0];
2925         bitmask[1] = nfs4_fattr_bitmap[1];
2926         /*
2927          * Process the label in the upcoming getfattr
2928          */
2929         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2930
2931         nfs_fattr_init(info->fattr);
2932         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2933 }
2934
2935 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2936                 struct nfs_fsinfo *info)
2937 {
2938         struct nfs4_exception exception = { };
2939         int err;
2940         do {
2941                 err = _nfs4_lookup_root(server, fhandle, info);
2942                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2943                 switch (err) {
2944                 case 0:
2945                 case -NFS4ERR_WRONGSEC:
2946                         goto out;
2947                 default:
2948                         err = nfs4_handle_exception(server, err, &exception);
2949                 }
2950         } while (exception.retry);
2951 out:
2952         return err;
2953 }
2954
2955 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2956                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2957 {
2958         struct rpc_auth_create_args auth_args = {
2959                 .pseudoflavor = flavor,
2960         };
2961         struct rpc_auth *auth;
2962         int ret;
2963
2964         auth = rpcauth_create(&auth_args, server->client);
2965         if (IS_ERR(auth)) {
2966                 ret = -EACCES;
2967                 goto out;
2968         }
2969         ret = nfs4_lookup_root(server, fhandle, info);
2970 out:
2971         return ret;
2972 }
2973
2974 /*
2975  * Retry pseudoroot lookup with various security flavors.  We do this when:
2976  *
2977  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2978  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2979  *
2980  * Returns zero on success, or a negative NFS4ERR value, or a
2981  * negative errno value.
2982  */
2983 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2984                               struct nfs_fsinfo *info)
2985 {
2986         /* Per 3530bis 15.33.5 */
2987         static const rpc_authflavor_t flav_array[] = {
2988                 RPC_AUTH_GSS_KRB5P,
2989                 RPC_AUTH_GSS_KRB5I,
2990                 RPC_AUTH_GSS_KRB5,
2991                 RPC_AUTH_UNIX,                  /* courtesy */
2992                 RPC_AUTH_NULL,
2993         };
2994         int status = -EPERM;
2995         size_t i;
2996
2997         if (server->auth_info.flavor_len > 0) {
2998                 /* try each flavor specified by user */
2999                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3000                         status = nfs4_lookup_root_sec(server, fhandle, info,
3001                                                 server->auth_info.flavors[i]);
3002                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3003                                 continue;
3004                         break;
3005                 }
3006         } else {
3007                 /* no flavors specified by user, try default list */
3008                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3009                         status = nfs4_lookup_root_sec(server, fhandle, info,
3010                                                       flav_array[i]);
3011                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3012                                 continue;
3013                         break;
3014                 }
3015         }
3016
3017         /*
3018          * -EACCESS could mean that the user doesn't have correct permissions
3019          * to access the mount.  It could also mean that we tried to mount
3020          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3021          * existing mount programs don't handle -EACCES very well so it should
3022          * be mapped to -EPERM instead.
3023          */
3024         if (status == -EACCES)
3025                 status = -EPERM;
3026         return status;
3027 }
3028
3029 static int nfs4_do_find_root_sec(struct nfs_server *server,
3030                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3031 {
3032         int mv = server->nfs_client->cl_minorversion;
3033         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3034 }
3035
3036 /**
3037  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3038  * @server: initialized nfs_server handle
3039  * @fhandle: we fill in the pseudo-fs root file handle
3040  * @info: we fill in an FSINFO struct
3041  * @auth_probe: probe the auth flavours
3042  *
3043  * Returns zero on success, or a negative errno.
3044  */
3045 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3046                          struct nfs_fsinfo *info,
3047                          bool auth_probe)
3048 {
3049         int status;
3050
3051         switch (auth_probe) {
3052         case false:
3053                 status = nfs4_lookup_root(server, fhandle, info);
3054                 if (status != -NFS4ERR_WRONGSEC)
3055                         break;
3056         default:
3057                 status = nfs4_do_find_root_sec(server, fhandle, info);
3058         }
3059
3060         if (status == 0)
3061                 status = nfs4_server_capabilities(server, fhandle);
3062         if (status == 0)
3063                 status = nfs4_do_fsinfo(server, fhandle, info);
3064
3065         return nfs4_map_errors(status);
3066 }
3067
3068 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3069                               struct nfs_fsinfo *info)
3070 {
3071         int error;
3072         struct nfs_fattr *fattr = info->fattr;
3073         struct nfs4_label *label = NULL;
3074
3075         error = nfs4_server_capabilities(server, mntfh);
3076         if (error < 0) {
3077                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3078                 return error;
3079         }
3080
3081         label = nfs4_label_alloc(server, GFP_KERNEL);
3082         if (IS_ERR(label))
3083                 return PTR_ERR(label);
3084
3085         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3086         if (error < 0) {
3087                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3088                 goto err_free_label;
3089         }
3090
3091         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3092             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3093                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3094
3095 err_free_label:
3096         nfs4_label_free(label);
3097
3098         return error;
3099 }
3100
3101 /*
3102  * Get locations and (maybe) other attributes of a referral.
3103  * Note that we'll actually follow the referral later when
3104  * we detect fsid mismatch in inode revalidation
3105  */
3106 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3107                              const struct qstr *name, struct nfs_fattr *fattr,
3108                              struct nfs_fh *fhandle)
3109 {
3110         int status = -ENOMEM;
3111         struct page *page = NULL;
3112         struct nfs4_fs_locations *locations = NULL;
3113
3114         page = alloc_page(GFP_KERNEL);
3115         if (page == NULL)
3116                 goto out;
3117         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3118         if (locations == NULL)
3119                 goto out;
3120
3121         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3122         if (status != 0)
3123                 goto out;
3124
3125         /*
3126          * If the fsid didn't change, this is a migration event, not a
3127          * referral.  Cause us to drop into the exception handler, which
3128          * will kick off migration recovery.
3129          */
3130         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3131                 dprintk("%s: server did not return a different fsid for"
3132                         " a referral at %s\n", __func__, name->name);
3133                 status = -NFS4ERR_MOVED;
3134                 goto out;
3135         }
3136         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3137         nfs_fixup_referral_attributes(&locations->fattr);
3138
3139         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3140         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3141         memset(fhandle, 0, sizeof(struct nfs_fh));
3142 out:
3143         if (page)
3144                 __free_page(page);
3145         kfree(locations);
3146         return status;
3147 }
3148
3149 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3150                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3151 {
3152         struct nfs4_getattr_arg args = {
3153                 .fh = fhandle,
3154                 .bitmask = server->attr_bitmask,
3155         };
3156         struct nfs4_getattr_res res = {
3157                 .fattr = fattr,
3158                 .label = label,
3159                 .server = server,
3160         };
3161         struct rpc_message msg = {
3162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3163                 .rpc_argp = &args,
3164                 .rpc_resp = &res,
3165         };
3166
3167         args.bitmask = nfs4_bitmask(server, label);
3168
3169         nfs_fattr_init(fattr);
3170         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3171 }
3172
3173 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3174                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3175 {
3176         struct nfs4_exception exception = { };
3177         int err;
3178         do {
3179                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3180                 trace_nfs4_getattr(server, fhandle, fattr, err);
3181                 err = nfs4_handle_exception(server, err,
3182                                 &exception);
3183         } while (exception.retry);
3184         return err;
3185 }
3186
3187 /*
3188  * The file is not closed if it is opened due to the a request to change
3189  * the size of the file. The open call will not be needed once the
3190  * VFS layer lookup-intents are implemented.
3191  *
3192  * Close is called when the inode is destroyed.
3193  * If we haven't opened the file for O_WRONLY, we
3194  * need to in the size_change case to obtain a stateid.
3195  *
3196  * Got race?
3197  * Because OPEN is always done by name in nfsv4, it is
3198  * possible that we opened a different file by the same
3199  * name.  We can recognize this race condition, but we
3200  * can't do anything about it besides returning an error.
3201  *
3202  * This will be fixed with VFS changes (lookup-intent).
3203  */
3204 static int
3205 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3206                   struct iattr *sattr)
3207 {
3208         struct inode *inode = dentry->d_inode;
3209         struct rpc_cred *cred = NULL;
3210         struct nfs4_state *state = NULL;
3211         struct nfs4_label *label = NULL;
3212         int status;
3213
3214         if (pnfs_ld_layoutret_on_setattr(inode) &&
3215             sattr->ia_valid & ATTR_SIZE &&
3216             sattr->ia_size < i_size_read(inode))
3217                 pnfs_commit_and_return_layout(inode);
3218
3219         nfs_fattr_init(fattr);
3220
3221         /* Deal with open(O_TRUNC) */
3222         if (sattr->ia_valid & ATTR_OPEN)
3223                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3224
3225         /* Optimization: if the end result is no change, don't RPC */
3226         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3227                 return 0;
3228
3229         /* Search for an existing open(O_WRITE) file */
3230         if (sattr->ia_valid & ATTR_FILE) {
3231                 struct nfs_open_context *ctx;
3232
3233                 ctx = nfs_file_open_context(sattr->ia_file);
3234                 if (ctx) {
3235                         cred = ctx->cred;
3236                         state = ctx->state;
3237                 }
3238         }
3239
3240         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3241         if (IS_ERR(label))
3242                 return PTR_ERR(label);
3243
3244         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3245         if (status == 0) {
3246                 nfs_setattr_update_inode(inode, sattr);
3247                 nfs_setsecurity(inode, fattr, label);
3248         }
3249         nfs4_label_free(label);
3250         return status;
3251 }
3252
3253 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3254                 const struct qstr *name, struct nfs_fh *fhandle,
3255                 struct nfs_fattr *fattr, struct nfs4_label *label)
3256 {
3257         struct nfs_server *server = NFS_SERVER(dir);
3258         int                    status;
3259         struct nfs4_lookup_arg args = {
3260                 .bitmask = server->attr_bitmask,
3261                 .dir_fh = NFS_FH(dir),
3262                 .name = name,
3263         };
3264         struct nfs4_lookup_res res = {
3265                 .server = server,
3266                 .fattr = fattr,
3267                 .label = label,
3268                 .fh = fhandle,
3269         };
3270         struct rpc_message msg = {
3271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3272                 .rpc_argp = &args,
3273                 .rpc_resp = &res,
3274         };
3275
3276         args.bitmask = nfs4_bitmask(server, label);
3277
3278         nfs_fattr_init(fattr);
3279
3280         dprintk("NFS call  lookup %s\n", name->name);
3281         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3282         dprintk("NFS reply lookup: %d\n", status);
3283         return status;
3284 }
3285
3286 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3287 {
3288         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3289                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3290         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3291         fattr->nlink = 2;
3292 }
3293
3294 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3295                                    struct qstr *name, struct nfs_fh *fhandle,
3296                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3297 {
3298         struct nfs4_exception exception = { };
3299         struct rpc_clnt *client = *clnt;
3300         int err;
3301         do {
3302                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3303                 trace_nfs4_lookup(dir, name, err);
3304                 switch (err) {
3305                 case -NFS4ERR_BADNAME:
3306                         err = -ENOENT;
3307                         goto out;
3308                 case -NFS4ERR_MOVED:
3309                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3310                         goto out;
3311                 case -NFS4ERR_WRONGSEC:
3312                         err = -EPERM;
3313                         if (client != *clnt)
3314                                 goto out;
3315                         client = nfs4_negotiate_security(client, dir, name);
3316                         if (IS_ERR(client))
3317                                 return PTR_ERR(client);
3318
3319                         exception.retry = 1;
3320                         break;
3321                 default:
3322                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3323                 }
3324         } while (exception.retry);
3325
3326 out:
3327         if (err == 0)
3328                 *clnt = client;
3329         else if (client != *clnt)
3330                 rpc_shutdown_client(client);
3331
3332         return err;
3333 }
3334
3335 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3336                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3337                             struct nfs4_label *label)
3338 {
3339         int status;
3340         struct rpc_clnt *client = NFS_CLIENT(dir);
3341
3342         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3343         if (client != NFS_CLIENT(dir)) {
3344                 rpc_shutdown_client(client);
3345                 nfs_fixup_secinfo_attributes(fattr);
3346         }
3347         return status;
3348 }
3349
3350 struct rpc_clnt *
3351 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3352                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3353 {
3354         struct rpc_clnt *client = NFS_CLIENT(dir);
3355         int status;
3356
3357         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3358         if (status < 0)
3359                 return ERR_PTR(status);
3360         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3361 }
3362
3363 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3364 {
3365         struct nfs_server *server = NFS_SERVER(inode);
3366         struct nfs4_accessargs args = {
3367                 .fh = NFS_FH(inode),
3368                 .bitmask = server->cache_consistency_bitmask,
3369         };
3370         struct nfs4_accessres res = {
3371                 .server = server,
3372         };
3373         struct rpc_message msg = {
3374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3375                 .rpc_argp = &args,
3376                 .rpc_resp = &res,
3377                 .rpc_cred = entry->cred,
3378         };
3379         int mode = entry->mask;
3380         int status = 0;
3381
3382         /*
3383          * Determine which access bits we want to ask for...
3384          */
3385         if (mode & MAY_READ)
3386                 args.access |= NFS4_ACCESS_READ;
3387         if (S_ISDIR(inode->i_mode)) {
3388                 if (mode & MAY_WRITE)
3389                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3390                 if (mode & MAY_EXEC)
3391                         args.access |= NFS4_ACCESS_LOOKUP;
3392         } else {
3393                 if (mode & MAY_WRITE)
3394                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3395                 if (mode & MAY_EXEC)
3396                         args.access |= NFS4_ACCESS_EXECUTE;
3397         }
3398
3399         res.fattr = nfs_alloc_fattr();
3400         if (res.fattr == NULL)
3401                 return -ENOMEM;
3402
3403         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3404         if (!status) {
3405                 nfs_access_set_mask(entry, res.access);
3406                 nfs_refresh_inode(inode, res.fattr);
3407         }
3408         nfs_free_fattr(res.fattr);
3409         return status;
3410 }
3411
3412 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3413 {
3414         struct nfs4_exception exception = { };
3415         int err;
3416         do {
3417                 err = _nfs4_proc_access(inode, entry);
3418                 trace_nfs4_access(inode, err);
3419                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3420                                 &exception);
3421         } while (exception.retry);
3422         return err;
3423 }
3424
3425 /*
3426  * TODO: For the time being, we don't try to get any attributes
3427  * along with any of the zero-copy operations READ, READDIR,
3428  * READLINK, WRITE.
3429  *
3430  * In the case of the first three, we want to put the GETATTR
3431  * after the read-type operation -- this is because it is hard
3432  * to predict the length of a GETATTR response in v4, and thus
3433  * align the READ data correctly.  This means that the GETATTR
3434  * may end up partially falling into the page cache, and we should
3435  * shift it into the 'tail' of the xdr_buf before processing.
3436  * To do this efficiently, we need to know the total length
3437  * of data received, which doesn't seem to be available outside
3438  * of the RPC layer.
3439  *
3440  * In the case of WRITE, we also want to put the GETATTR after
3441  * the operation -- in this case because we want to make sure
3442  * we get the post-operation mtime and size.
3443  *
3444  * Both of these changes to the XDR layer would in fact be quite
3445  * minor, but I decided to leave them for a subsequent patch.
3446  */
3447 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3448                 unsigned int pgbase, unsigned int pglen)
3449 {
3450         struct nfs4_readlink args = {
3451                 .fh       = NFS_FH(inode),
3452                 .pgbase   = pgbase,
3453                 .pglen    = pglen,
3454                 .pages    = &page,
3455         };
3456         struct nfs4_readlink_res res;
3457         struct rpc_message msg = {
3458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3459                 .rpc_argp = &args,
3460                 .rpc_resp = &res,
3461         };
3462
3463         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3464 }
3465
3466 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3467                 unsigned int pgbase, unsigned int pglen)
3468 {
3469         struct nfs4_exception exception = { };
3470         int err;
3471         do {
3472                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3473                 trace_nfs4_readlink(inode, err);
3474                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3475                                 &exception);
3476         } while (exception.retry);
3477         return err;
3478 }
3479
3480 /*
3481  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3482  */
3483 static int
3484 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3485                  int flags)
3486 {
3487         struct nfs4_label l, *ilabel = NULL;
3488         struct nfs_open_context *ctx;
3489         struct nfs4_state *state;
3490         int opened = 0;
3491         int status = 0;
3492
3493         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3494         if (IS_ERR(ctx))
3495                 return PTR_ERR(ctx);
3496
3497         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3498
3499         sattr->ia_mode &= ~current_umask();
3500         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3501         if (IS_ERR(state)) {
3502                 status = PTR_ERR(state);
3503                 goto out;
3504         }
3505 out:
3506         nfs4_label_release_security(ilabel);
3507         put_nfs_open_context(ctx);
3508         return status;
3509 }
3510
3511 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3512 {
3513         struct nfs_server *server = NFS_SERVER(dir);
3514         struct nfs_removeargs args = {
3515                 .fh = NFS_FH(dir),
3516                 .name = *name,
3517         };
3518         struct nfs_removeres res = {
3519                 .server = server,
3520         };
3521         struct rpc_message msg = {
3522                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3523                 .rpc_argp = &args,
3524                 .rpc_resp = &res,
3525         };
3526         int status;
3527
3528         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3529         if (status == 0)
3530                 update_changeattr(dir, &res.cinfo);
3531         return status;
3532 }
3533
3534 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3535 {
3536         struct nfs4_exception exception = { };
3537         int err;
3538         do {
3539                 err = _nfs4_proc_remove(dir, name);
3540                 trace_nfs4_remove(dir, name, err);
3541                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3542                                 &exception);
3543         } while (exception.retry);
3544         return err;
3545 }
3546
3547 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3548 {
3549         struct nfs_server *server = NFS_SERVER(dir);
3550         struct nfs_removeargs *args = msg->rpc_argp;
3551         struct nfs_removeres *res = msg->rpc_resp;
3552
3553         res->server = server;
3554         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3555         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3556
3557         nfs_fattr_init(res->dir_attr);
3558 }
3559
3560 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3561 {
3562         nfs4_setup_sequence(NFS_SERVER(data->dir),
3563                         &data->args.seq_args,
3564                         &data->res.seq_res,
3565                         task);
3566 }
3567
3568 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3569 {
3570         struct nfs_unlinkdata *data = task->tk_calldata;
3571         struct nfs_removeres *res = &data->res;
3572
3573         if (!nfs4_sequence_done(task, &res->seq_res))
3574                 return 0;
3575         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3576                 return 0;
3577         update_changeattr(dir, &res->cinfo);
3578         return 1;
3579 }
3580
3581 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3582 {
3583         struct nfs_server *server = NFS_SERVER(dir);
3584         struct nfs_renameargs *arg = msg->rpc_argp;
3585         struct nfs_renameres *res = msg->rpc_resp;
3586
3587         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3588         res->server = server;
3589         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3590 }
3591
3592 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3593 {
3594         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3595                         &data->args.seq_args,
3596                         &data->res.seq_res,
3597                         task);
3598 }
3599
3600 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3601                                  struct inode *new_dir)
3602 {
3603         struct nfs_renamedata *data = task->tk_calldata;
3604         struct nfs_renameres *res = &data->res;
3605
3606         if (!nfs4_sequence_done(task, &res->seq_res))
3607                 return 0;
3608         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3609                 return 0;
3610
3611         update_changeattr(old_dir, &res->old_cinfo);
3612         update_changeattr(new_dir, &res->new_cinfo);
3613         return 1;
3614 }
3615
3616 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3617 {
3618         struct nfs_server *server = NFS_SERVER(inode);
3619         struct nfs4_link_arg arg = {
3620                 .fh     = NFS_FH(inode),
3621                 .dir_fh = NFS_FH(dir),
3622                 .name   = name,
3623                 .bitmask = server->attr_bitmask,
3624         };
3625         struct nfs4_link_res res = {
3626                 .server = server,
3627                 .label = NULL,
3628         };
3629         struct rpc_message msg = {
3630                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3631                 .rpc_argp = &arg,
3632                 .rpc_resp = &res,
3633         };
3634         int status = -ENOMEM;
3635
3636         res.fattr = nfs_alloc_fattr();
3637         if (res.fattr == NULL)
3638                 goto out;
3639
3640         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3641         if (IS_ERR(res.label)) {
3642                 status = PTR_ERR(res.label);
3643                 goto out;
3644         }
3645         arg.bitmask = nfs4_bitmask(server, res.label);
3646
3647         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3648         if (!status) {
3649                 update_changeattr(dir, &res.cinfo);
3650                 status = nfs_post_op_update_inode(inode, res.fattr);
3651                 if (!status)
3652                         nfs_setsecurity(inode, res.fattr, res.label);
3653         }
3654
3655
3656         nfs4_label_free(res.label);
3657
3658 out:
3659         nfs_free_fattr(res.fattr);
3660         return status;
3661 }
3662
3663 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3664 {
3665         struct nfs4_exception exception = { };
3666         int err;
3667         do {
3668                 err = nfs4_handle_exception(NFS_SERVER(inode),
3669                                 _nfs4_proc_link(inode, dir, name),
3670                                 &exception);
3671         } while (exception.retry);
3672         return err;
3673 }
3674
3675 struct nfs4_createdata {
3676         struct rpc_message msg;
3677         struct nfs4_create_arg arg;
3678         struct nfs4_create_res res;
3679         struct nfs_fh fh;
3680         struct nfs_fattr fattr;
3681         struct nfs4_label *label;
3682 };
3683
3684 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3685                 struct qstr *name, struct iattr *sattr, u32 ftype)
3686 {
3687         struct nfs4_createdata *data;
3688
3689         data = kzalloc(sizeof(*data), GFP_KERNEL);
3690         if (data != NULL) {
3691                 struct nfs_server *server = NFS_SERVER(dir);
3692
3693                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3694                 if (IS_ERR(data->label))
3695                         goto out_free;
3696
3697                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3698                 data->msg.rpc_argp = &data->arg;
3699                 data->msg.rpc_resp = &data->res;
3700                 data->arg.dir_fh = NFS_FH(dir);
3701                 data->arg.server = server;
3702                 data->arg.name = name;
3703                 data->arg.attrs = sattr;
3704                 data->arg.ftype = ftype;
3705                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3706                 data->res.server = server;
3707                 data->res.fh = &data->fh;
3708                 data->res.fattr = &data->fattr;
3709                 data->res.label = data->label;
3710                 nfs_fattr_init(data->res.fattr);
3711         }
3712         return data;
3713 out_free:
3714         kfree(data);
3715         return NULL;
3716 }
3717
3718 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3719 {
3720         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3721                                     &data->arg.seq_args, &data->res.seq_res, 1);
3722         if (status == 0) {
3723                 update_changeattr(dir, &data->res.dir_cinfo);
3724                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3725         }
3726         return status;
3727 }
3728
3729 static void nfs4_free_createdata(struct nfs4_createdata *data)
3730 {
3731         nfs4_label_free(data->label);
3732         kfree(data);
3733 }
3734
3735 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3736                 struct page *page, unsigned int len, struct iattr *sattr,
3737                 struct nfs4_label *label)
3738 {
3739         struct nfs4_createdata *data;
3740         int status = -ENAMETOOLONG;
3741
3742         if (len > NFS4_MAXPATHLEN)
3743                 goto out;
3744
3745         status = -ENOMEM;
3746         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3747         if (data == NULL)
3748                 goto out;
3749
3750         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3751         data->arg.u.symlink.pages = &page;
3752         data->arg.u.symlink.len = len;
3753         data->arg.label = label;
3754
3755         status = nfs4_do_create(dir, dentry, data);
3756
3757         nfs4_free_createdata(data);
3758 out:
3759         return status;
3760 }
3761
3762 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3763                 struct page *page, unsigned int len, struct iattr *sattr)
3764 {
3765         struct nfs4_exception exception = { };
3766         struct nfs4_label l, *label = NULL;
3767         int err;
3768
3769         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3770
3771         do {
3772                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3773                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3774                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3775                                 &exception);
3776         } while (exception.retry);
3777
3778         nfs4_label_release_security(label);
3779         return err;
3780 }
3781
3782 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3783                 struct iattr *sattr, struct nfs4_label *label)
3784 {
3785         struct nfs4_createdata *data;
3786         int status = -ENOMEM;
3787
3788         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3789         if (data == NULL)
3790                 goto out;
3791
3792         data->arg.label = label;
3793         status = nfs4_do_create(dir, dentry, data);
3794
3795         nfs4_free_createdata(data);
3796 out:
3797         return status;
3798 }
3799
3800 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3801                 struct iattr *sattr)
3802 {
3803         struct nfs4_exception exception = { };
3804         struct nfs4_label l, *label = NULL;
3805         int err;
3806
3807         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3808
3809         sattr->ia_mode &= ~current_umask();
3810         do {
3811                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3812                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3813                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3814                                 &exception);
3815         } while (exception.retry);
3816         nfs4_label_release_security(label);
3817
3818         return err;
3819 }
3820
3821 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3822                 u64 cookie, struct page **pages, unsigned int count, int plus)
3823 {
3824         struct inode            *dir = dentry->d_inode;
3825         struct nfs4_readdir_arg args = {
3826                 .fh = NFS_FH(dir),
3827                 .pages = pages,
3828                 .pgbase = 0,
3829                 .count = count,
3830                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3831                 .plus = plus,
3832         };
3833         struct nfs4_readdir_res res;
3834         struct rpc_message msg = {
3835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3836                 .rpc_argp = &args,
3837                 .rpc_resp = &res,
3838                 .rpc_cred = cred,
3839         };
3840         int                     status;
3841
3842         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3843                         dentry,
3844                         (unsigned long long)cookie);
3845         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3846         res.pgbase = args.pgbase;
3847         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3848         if (status >= 0) {
3849                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3850                 status += args.pgbase;
3851         }
3852
3853         nfs_invalidate_atime(dir);
3854
3855         dprintk("%s: returns %d\n", __func__, status);
3856         return status;
3857 }
3858
3859 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3860                 u64 cookie, struct page **pages, unsigned int count, int plus)
3861 {
3862         struct nfs4_exception exception = { };
3863         int err;
3864         do {
3865                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3866                                 pages, count, plus);
3867                 trace_nfs4_readdir(dentry->d_inode, err);
3868                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3869                                 &exception);
3870         } while (exception.retry);
3871         return err;
3872 }
3873
3874 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3875                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3876 {
3877         struct nfs4_createdata *data;
3878         int mode = sattr->ia_mode;
3879         int status = -ENOMEM;
3880
3881         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3882         if (data == NULL)
3883                 goto out;
3884
3885         if (S_ISFIFO(mode))
3886                 data->arg.ftype = NF4FIFO;
3887         else if (S_ISBLK(mode)) {
3888                 data->arg.ftype = NF4BLK;
3889                 data->arg.u.device.specdata1 = MAJOR(rdev);
3890                 data->arg.u.device.specdata2 = MINOR(rdev);
3891         }
3892         else if (S_ISCHR(mode)) {
3893                 data->arg.ftype = NF4CHR;
3894                 data->arg.u.device.specdata1 = MAJOR(rdev);
3895                 data->arg.u.device.specdata2 = MINOR(rdev);
3896         } else if (!S_ISSOCK(mode)) {
3897                 status = -EINVAL;
3898                 goto out_free;
3899         }
3900
3901         data->arg.label = label;
3902         status = nfs4_do_create(dir, dentry, data);
3903 out_free:
3904         nfs4_free_createdata(data);
3905 out:
3906         return status;
3907 }
3908
3909 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3910                 struct iattr *sattr, dev_t rdev)
3911 {
3912         struct nfs4_exception exception = { };
3913         struct nfs4_label l, *label = NULL;
3914         int err;
3915
3916         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3917
3918         sattr->ia_mode &= ~current_umask();
3919         do {
3920                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3921                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3922                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3923                                 &exception);
3924         } while (exception.retry);
3925
3926         nfs4_label_release_security(label);
3927
3928         return err;
3929 }
3930
3931 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3932                  struct nfs_fsstat *fsstat)
3933 {
3934         struct nfs4_statfs_arg args = {
3935                 .fh = fhandle,
3936                 .bitmask = server->attr_bitmask,
3937         };
3938         struct nfs4_statfs_res res = {
3939                 .fsstat = fsstat,
3940         };
3941         struct rpc_message msg = {
3942                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3943                 .rpc_argp = &args,
3944                 .rpc_resp = &res,
3945         };
3946
3947         nfs_fattr_init(fsstat->fattr);
3948         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3949 }
3950
3951 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3952 {
3953         struct nfs4_exception exception = { };
3954         int err;
3955         do {
3956                 err = nfs4_handle_exception(server,
3957                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3958                                 &exception);
3959         } while (exception.retry);
3960         return err;
3961 }
3962
3963 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3964                 struct nfs_fsinfo *fsinfo)
3965 {
3966         struct nfs4_fsinfo_arg args = {
3967                 .fh = fhandle,
3968                 .bitmask = server->attr_bitmask,
3969         };
3970         struct nfs4_fsinfo_res res = {
3971                 .fsinfo = fsinfo,
3972         };
3973         struct rpc_message msg = {
3974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3975                 .rpc_argp = &args,
3976                 .rpc_resp = &res,
3977         };
3978
3979         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3980 }
3981
3982 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3983 {
3984         struct nfs4_exception exception = { };
3985         unsigned long now = jiffies;
3986         int err;
3987
3988         do {
3989                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3990                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3991                 if (err == 0) {
3992                         struct nfs_client *clp = server->nfs_client;
3993
3994                         spin_lock(&clp->cl_lock);
3995                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3996                         clp->cl_last_renewal = now;
3997                         spin_unlock(&clp->cl_lock);
3998                         break;
3999                 }
4000                 err = nfs4_handle_exception(server, err, &exception);
4001         } while (exception.retry);
4002         return err;
4003 }
4004
4005 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4006 {
4007         int error;
4008
4009         nfs_fattr_init(fsinfo->fattr);
4010         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4011         if (error == 0) {
4012                 /* block layout checks this! */
4013                 server->pnfs_blksize = fsinfo->blksize;
4014                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4015         }
4016
4017         return error;
4018 }
4019
4020 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4021                 struct nfs_pathconf *pathconf)
4022 {
4023         struct nfs4_pathconf_arg args = {
4024                 .fh = fhandle,
4025                 .bitmask = server->attr_bitmask,
4026         };
4027         struct nfs4_pathconf_res res = {
4028                 .pathconf = pathconf,
4029         };
4030         struct rpc_message msg = {
4031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4032                 .rpc_argp = &args,
4033                 .rpc_resp = &res,
4034         };
4035
4036         /* None of the pathconf attributes are mandatory to implement */
4037         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4038                 memset(pathconf, 0, sizeof(*pathconf));
4039                 return 0;
4040         }
4041
4042         nfs_fattr_init(pathconf->fattr);
4043         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4044 }
4045
4046 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4047                 struct nfs_pathconf *pathconf)
4048 {
4049         struct nfs4_exception exception = { };
4050         int err;
4051
4052         do {
4053                 err = nfs4_handle_exception(server,
4054                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4055                                 &exception);
4056         } while (exception.retry);
4057         return err;
4058 }
4059
4060 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4061                 const struct nfs_open_context *ctx,
4062                 const struct nfs_lock_context *l_ctx,
4063                 fmode_t fmode)
4064 {
4065         const struct nfs_lockowner *lockowner = NULL;
4066
4067         if (l_ctx != NULL)
4068                 lockowner = &l_ctx->lockowner;
4069         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4070 }
4071 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4072
4073 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4074                 const struct nfs_open_context *ctx,
4075                 const struct nfs_lock_context *l_ctx,
4076                 fmode_t fmode)
4077 {
4078         nfs4_stateid current_stateid;
4079
4080         /* If the current stateid represents a lost lock, then exit */
4081         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4082                 return true;
4083         return nfs4_stateid_match(stateid, &current_stateid);
4084 }
4085
4086 static bool nfs4_error_stateid_expired(int err)
4087 {
4088         switch (err) {
4089         case -NFS4ERR_DELEG_REVOKED:
4090         case -NFS4ERR_ADMIN_REVOKED:
4091         case -NFS4ERR_BAD_STATEID:
4092         case -NFS4ERR_STALE_STATEID:
4093         case -NFS4ERR_OLD_STATEID:
4094         case -NFS4ERR_OPENMODE:
4095         case -NFS4ERR_EXPIRED:
4096                 return true;
4097         }
4098         return false;
4099 }
4100
4101 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4102 {
4103         nfs_invalidate_atime(hdr->inode);
4104 }
4105
4106 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4107 {
4108         struct nfs_server *server = NFS_SERVER(hdr->inode);
4109
4110         trace_nfs4_read(hdr, task->tk_status);
4111         if (nfs4_async_handle_error(task, server,
4112                                     hdr->args.context->state) == -EAGAIN) {
4113                 rpc_restart_call_prepare(task);
4114                 return -EAGAIN;
4115         }
4116
4117         __nfs4_read_done_cb(hdr);
4118         if (task->tk_status > 0)
4119                 renew_lease(server, hdr->timestamp);
4120         return 0;
4121 }
4122
4123 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4124                 struct nfs_pgio_args *args)
4125 {
4126
4127         if (!nfs4_error_stateid_expired(task->tk_status) ||
4128                 nfs4_stateid_is_current(&args->stateid,
4129                                 args->context,
4130                                 args->lock_context,
4131                                 FMODE_READ))
4132                 return false;
4133         rpc_restart_call_prepare(task);
4134         return true;
4135 }
4136
4137 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4138 {
4139
4140         dprintk("--> %s\n", __func__);
4141
4142         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4143                 return -EAGAIN;
4144         if (nfs4_read_stateid_changed(task, &hdr->args))
4145                 return -EAGAIN;
4146         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4147                                     nfs4_read_done_cb(task, hdr);
4148 }
4149
4150 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4151                                  struct rpc_message *msg)
4152 {
4153         hdr->timestamp   = jiffies;
4154         hdr->pgio_done_cb = nfs4_read_done_cb;
4155         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4156         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4157 }
4158
4159 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4160                                       struct nfs_pgio_header *hdr)
4161 {
4162         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4163                         &hdr->args.seq_args,
4164                         &hdr->res.seq_res,
4165                         task))
4166                 return 0;
4167         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4168                                 hdr->args.lock_context,
4169                                 hdr->rw_ops->rw_mode) == -EIO)
4170                 return -EIO;
4171         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4172                 return -EIO;
4173         return 0;
4174 }
4175
4176 static int nfs4_write_done_cb(struct rpc_task *task,
4177                               struct nfs_pgio_header *hdr)
4178 {
4179         struct inode *inode = hdr->inode;
4180
4181         trace_nfs4_write(hdr, task->tk_status);
4182         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4183                                     hdr->args.context->state) == -EAGAIN) {
4184                 rpc_restart_call_prepare(task);
4185                 return -EAGAIN;
4186         }
4187         if (task->tk_status >= 0) {
4188                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4189                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4190         }
4191         return 0;
4192 }
4193
4194 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4195                 struct nfs_pgio_args *args)
4196 {
4197
4198         if (!nfs4_error_stateid_expired(task->tk_status) ||
4199                 nfs4_stateid_is_current(&args->stateid,
4200                                 args->context,
4201                                 args->lock_context,
4202                                 FMODE_WRITE))
4203                 return false;
4204         rpc_restart_call_prepare(task);
4205         return true;
4206 }
4207
4208 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4209 {
4210         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4211                 return -EAGAIN;
4212         if (nfs4_write_stateid_changed(task, &hdr->args))
4213                 return -EAGAIN;
4214         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4215                 nfs4_write_done_cb(task, hdr);
4216 }
4217
4218 static
4219 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4220 {
4221         /* Don't request attributes for pNFS or O_DIRECT writes */
4222         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4223                 return false;
4224         /* Otherwise, request attributes if and only if we don't hold
4225          * a delegation
4226          */
4227         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4228 }
4229
4230 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4231                                   struct rpc_message *msg)
4232 {
4233         struct nfs_server *server = NFS_SERVER(hdr->inode);
4234
4235         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4236                 hdr->args.bitmask = NULL;
4237                 hdr->res.fattr = NULL;
4238         } else
4239                 hdr->args.bitmask = server->cache_consistency_bitmask;
4240
4241         if (!hdr->pgio_done_cb)
4242                 hdr->pgio_done_cb = nfs4_write_done_cb;
4243         hdr->res.server = server;
4244         hdr->timestamp   = jiffies;
4245
4246         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4247         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4248 }
4249
4250 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4251 {
4252         nfs4_setup_sequence(NFS_SERVER(data->inode),
4253                         &data->args.seq_args,
4254                         &data->res.seq_res,
4255                         task);
4256 }
4257
4258 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4259 {
4260         struct inode *inode = data->inode;
4261
4262         trace_nfs4_commit(data, task->tk_status);
4263         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4264                 rpc_restart_call_prepare(task);
4265                 return -EAGAIN;
4266         }
4267         return 0;
4268 }
4269
4270 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4271 {
4272         if (!nfs4_sequence_done(task, &data->res.seq_res))
4273                 return -EAGAIN;
4274         return data->commit_done_cb(task, data);
4275 }
4276
4277 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4278 {
4279         struct nfs_server *server = NFS_SERVER(data->inode);
4280
4281         if (data->commit_done_cb == NULL)
4282                 data->commit_done_cb = nfs4_commit_done_cb;
4283         data->res.server = server;
4284         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4285         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4286 }
4287
4288 struct nfs4_renewdata {
4289         struct nfs_client       *client;
4290         unsigned long           timestamp;
4291 };
4292
4293 /*
4294  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4295  * standalone procedure for queueing an asynchronous RENEW.
4296  */
4297 static void nfs4_renew_release(void *calldata)
4298 {
4299         struct nfs4_renewdata *data = calldata;
4300         struct nfs_client *clp = data->client;
4301
4302         if (atomic_read(&clp->cl_count) > 1)
4303                 nfs4_schedule_state_renewal(clp);
4304         nfs_put_client(clp);
4305         kfree(data);
4306 }
4307
4308 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4309 {
4310         struct nfs4_renewdata *data = calldata;
4311         struct nfs_client *clp = data->client;
4312         unsigned long timestamp = data->timestamp;
4313
4314         trace_nfs4_renew_async(clp, task->tk_status);
4315         switch (task->tk_status) {
4316         case 0:
4317                 break;
4318         case -NFS4ERR_LEASE_MOVED:
4319                 nfs4_schedule_lease_moved_recovery(clp);
4320                 break;
4321         default:
4322                 /* Unless we're shutting down, schedule state recovery! */
4323                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4324                         return;
4325                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4326                         nfs4_schedule_lease_recovery(clp);
4327                         return;
4328                 }
4329                 nfs4_schedule_path_down_recovery(clp);
4330         }
4331         do_renew_lease(clp, timestamp);
4332 }
4333
4334 static const struct rpc_call_ops nfs4_renew_ops = {
4335         .rpc_call_done = nfs4_renew_done,
4336         .rpc_release = nfs4_renew_release,
4337 };
4338
4339 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4340 {
4341         struct rpc_message msg = {
4342                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4343                 .rpc_argp       = clp,
4344                 .rpc_cred       = cred,
4345         };
4346         struct nfs4_renewdata *data;
4347
4348         if (renew_flags == 0)
4349                 return 0;
4350         if (!atomic_inc_not_zero(&clp->cl_count))
4351                 return -EIO;
4352         data = kmalloc(sizeof(*data), GFP_NOFS);
4353         if (data == NULL)
4354                 return -ENOMEM;
4355         data->client = clp;
4356         data->timestamp = jiffies;
4357         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4358                         &nfs4_renew_ops, data);
4359 }
4360
4361 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4362 {
4363         struct rpc_message msg = {
4364                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4365                 .rpc_argp       = clp,
4366                 .rpc_cred       = cred,
4367         };
4368         unsigned long now = jiffies;
4369         int status;
4370
4371         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4372         if (status < 0)
4373                 return status;
4374         do_renew_lease(clp, now);
4375         return 0;
4376 }
4377
4378 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4379 {
4380         return server->caps & NFS_CAP_ACLS;
4381 }
4382
4383 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4384  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4385  * the stack.
4386  */
4387 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4388
4389 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4390                 struct page **pages, unsigned int *pgbase)
4391 {
4392         struct page *newpage, **spages;
4393         int rc = 0;
4394         size_t len;
4395         spages = pages;
4396
4397         do {
4398                 len = min_t(size_t, PAGE_SIZE, buflen);
4399                 newpage = alloc_page(GFP_KERNEL);
4400
4401                 if (newpage == NULL)
4402                         goto unwind;
4403                 memcpy(page_address(newpage), buf, len);
4404                 buf += len;
4405                 buflen -= len;
4406                 *pages++ = newpage;
4407                 rc++;
4408         } while (buflen != 0);
4409
4410         return rc;
4411
4412 unwind:
4413         for(; rc > 0; rc--)
4414                 __free_page(spages[rc-1]);
4415         return -ENOMEM;
4416 }
4417
4418 struct nfs4_cached_acl {
4419         int cached;
4420         size_t len;
4421         char data[0];
4422 };
4423
4424 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4425 {
4426         struct nfs_inode *nfsi = NFS_I(inode);
4427
4428         spin_lock(&inode->i_lock);
4429         kfree(nfsi->nfs4_acl);
4430         nfsi->nfs4_acl = acl;
4431         spin_unlock(&inode->i_lock);
4432 }
4433
4434 static void nfs4_zap_acl_attr(struct inode *inode)
4435 {
4436         nfs4_set_cached_acl(inode, NULL);
4437 }
4438
4439 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4440 {
4441         struct nfs_inode *nfsi = NFS_I(inode);
4442         struct nfs4_cached_acl *acl;
4443         int ret = -ENOENT;
4444
4445         spin_lock(&inode->i_lock);
4446         acl = nfsi->nfs4_acl;
4447         if (acl == NULL)
4448                 goto out;
4449         if (buf == NULL) /* user is just asking for length */
4450                 goto out_len;
4451         if (acl->cached == 0)
4452                 goto out;
4453         ret = -ERANGE; /* see getxattr(2) man page */
4454         if (acl->len > buflen)
4455                 goto out;
4456         memcpy(buf, acl->data, acl->len);
4457 out_len:
4458         ret = acl->len;
4459 out:
4460         spin_unlock(&inode->i_lock);
4461         return ret;
4462 }
4463
4464 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4465 {
4466         struct nfs4_cached_acl *acl;
4467         size_t buflen = sizeof(*acl) + acl_len;
4468
4469         if (buflen <= PAGE_SIZE) {
4470                 acl = kmalloc(buflen, GFP_KERNEL);
4471                 if (acl == NULL)
4472                         goto out;
4473                 acl->cached = 1;
4474                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4475         } else {
4476                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4477                 if (acl == NULL)
4478                         goto out;
4479                 acl->cached = 0;
4480         }
4481         acl->len = acl_len;
4482 out:
4483         nfs4_set_cached_acl(inode, acl);
4484 }
4485
4486 /*
4487  * The getxattr API returns the required buffer length when called with a
4488  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4489  * the required buf.  On a NULL buf, we send a page of data to the server
4490  * guessing that the ACL request can be serviced by a page. If so, we cache
4491  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4492  * the cache. If not so, we throw away the page, and cache the required
4493  * length. The next getxattr call will then produce another round trip to
4494  * the server, this time with the input buf of the required size.
4495  */
4496 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4497 {
4498         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4499         struct nfs_getaclargs args = {
4500                 .fh = NFS_FH(inode),
4501                 .acl_pages = pages,
4502                 .acl_len = buflen,
4503         };
4504         struct nfs_getaclres res = {
4505                 .acl_len = buflen,
4506         };
4507         struct rpc_message msg = {
4508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4509                 .rpc_argp = &args,
4510                 .rpc_resp = &res,
4511         };
4512         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4513         int ret = -ENOMEM, i;
4514
4515         /* As long as we're doing a round trip to the server anyway,
4516          * let's be prepared for a page of acl data. */
4517         if (npages == 0)
4518                 npages = 1;
4519         if (npages > ARRAY_SIZE(pages))
4520                 return -ERANGE;
4521
4522         for (i = 0; i < npages; i++) {
4523                 pages[i] = alloc_page(GFP_KERNEL);
4524                 if (!pages[i])
4525                         goto out_free;
4526         }
4527
4528         /* for decoding across pages */
4529         res.acl_scratch = alloc_page(GFP_KERNEL);
4530         if (!res.acl_scratch)
4531                 goto out_free;
4532
4533         args.acl_len = npages * PAGE_SIZE;
4534         args.acl_pgbase = 0;
4535
4536         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4537                 __func__, buf, buflen, npages, args.acl_len);
4538         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4539                              &msg, &args.seq_args, &res.seq_res, 0);
4540         if (ret)
4541                 goto out_free;
4542
4543         /* Handle the case where the passed-in buffer is too short */
4544         if (res.acl_flags & NFS4_ACL_TRUNC) {
4545                 /* Did the user only issue a request for the acl length? */
4546                 if (buf == NULL)
4547                         goto out_ok;
4548                 ret = -ERANGE;
4549                 goto out_free;
4550         }
4551         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4552         if (buf) {
4553                 if (res.acl_len > buflen) {
4554                         ret = -ERANGE;
4555                         goto out_free;
4556                 }
4557                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4558         }
4559 out_ok:
4560         ret = res.acl_len;
4561 out_free:
4562         for (i = 0; i < npages; i++)
4563                 if (pages[i])
4564                         __free_page(pages[i]);
4565         if (res.acl_scratch)
4566                 __free_page(res.acl_scratch);
4567         return ret;
4568 }
4569
4570 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4571 {
4572         struct nfs4_exception exception = { };
4573         ssize_t ret;
4574         do {
4575                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4576                 trace_nfs4_get_acl(inode, ret);
4577                 if (ret >= 0)
4578                         break;
4579                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4580         } while (exception.retry);
4581         return ret;
4582 }
4583
4584 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4585 {
4586         struct nfs_server *server = NFS_SERVER(inode);
4587         int ret;
4588
4589         if (!nfs4_server_supports_acls(server))
4590                 return -EOPNOTSUPP;
4591         ret = nfs_revalidate_inode(server, inode);
4592         if (ret < 0)
4593                 return ret;
4594         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4595                 nfs_zap_acl_cache(inode);
4596         ret = nfs4_read_cached_acl(inode, buf, buflen);
4597         if (ret != -ENOENT)
4598                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4599                  * but no cached acl data, just the acl length */
4600                 return ret;
4601         return nfs4_get_acl_uncached(inode, buf, buflen);
4602 }
4603
4604 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4605 {
4606         struct nfs_server *server = NFS_SERVER(inode);
4607         struct page *pages[NFS4ACL_MAXPAGES];
4608         struct nfs_setaclargs arg = {
4609                 .fh             = NFS_FH(inode),
4610                 .acl_pages      = pages,
4611                 .acl_len        = buflen,
4612         };
4613         struct nfs_setaclres res;
4614         struct rpc_message msg = {
4615                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4616                 .rpc_argp       = &arg,
4617                 .rpc_resp       = &res,
4618         };
4619         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4620         int ret, i;
4621
4622         if (!nfs4_server_supports_acls(server))
4623                 return -EOPNOTSUPP;
4624         if (npages > ARRAY_SIZE(pages))
4625                 return -ERANGE;
4626         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4627         if (i < 0)
4628                 return i;
4629         nfs4_inode_return_delegation(inode);
4630         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4631
4632         /*
4633          * Free each page after tx, so the only ref left is
4634          * held by the network stack
4635          */
4636         for (; i > 0; i--)
4637                 put_page(pages[i-1]);
4638
4639         /*
4640          * Acl update can result in inode attribute update.
4641          * so mark the attribute cache invalid.
4642          */
4643         spin_lock(&inode->i_lock);
4644         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4645         spin_unlock(&inode->i_lock);
4646         nfs_access_zap_cache(inode);
4647         nfs_zap_acl_cache(inode);
4648         return ret;
4649 }
4650
4651 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4652 {
4653         struct nfs4_exception exception = { };
4654         int err;
4655         do {
4656                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4657                 trace_nfs4_set_acl(inode, err);
4658                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4659                                 &exception);
4660         } while (exception.retry);
4661         return err;
4662 }
4663
4664 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4665 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4666                                         size_t buflen)
4667 {
4668         struct nfs_server *server = NFS_SERVER(inode);
4669         struct nfs_fattr fattr;
4670         struct nfs4_label label = {0, 0, buflen, buf};
4671
4672         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4673         struct nfs4_getattr_arg arg = {
4674                 .fh             = NFS_FH(inode),
4675                 .bitmask        = bitmask,
4676         };
4677         struct nfs4_getattr_res res = {
4678                 .fattr          = &fattr,
4679                 .label          = &label,
4680                 .server         = server,
4681         };
4682         struct rpc_message msg = {
4683                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4684                 .rpc_argp       = &arg,
4685                 .rpc_resp       = &res,
4686         };
4687         int ret;
4688
4689         nfs_fattr_init(&fattr);
4690
4691         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4692         if (ret)
4693                 return ret;
4694         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4695                 return -ENOENT;
4696         if (buflen < label.len)
4697                 return -ERANGE;
4698         return 0;
4699 }
4700
4701 static int nfs4_get_security_label(struct inode *inode, void *buf,
4702                                         size_t buflen)
4703 {
4704         struct nfs4_exception exception = { };
4705         int err;
4706
4707         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4708                 return -EOPNOTSUPP;
4709
4710         do {
4711                 err = _nfs4_get_security_label(inode, buf, buflen);
4712                 trace_nfs4_get_security_label(inode, err);
4713                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4714                                 &exception);
4715         } while (exception.retry);
4716         return err;
4717 }
4718
4719 static int _nfs4_do_set_security_label(struct inode *inode,
4720                 struct nfs4_label *ilabel,
4721                 struct nfs_fattr *fattr,
4722                 struct nfs4_label *olabel)
4723 {
4724
4725         struct iattr sattr = {0};
4726         struct nfs_server *server = NFS_SERVER(inode);
4727         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4728         struct nfs_setattrargs arg = {
4729                 .fh             = NFS_FH(inode),
4730                 .iap            = &sattr,
4731                 .server         = server,
4732                 .bitmask        = bitmask,
4733                 .label          = ilabel,
4734         };
4735         struct nfs_setattrres res = {
4736                 .fattr          = fattr,
4737                 .label          = olabel,
4738                 .server         = server,
4739         };
4740         struct rpc_message msg = {
4741                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4742                 .rpc_argp       = &arg,
4743                 .rpc_resp       = &res,
4744         };
4745         int status;
4746
4747         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4748
4749         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4750         if (status)
4751                 dprintk("%s failed: %d\n", __func__, status);
4752
4753         return status;
4754 }
4755
4756 static int nfs4_do_set_security_label(struct inode *inode,
4757                 struct nfs4_label *ilabel,
4758                 struct nfs_fattr *fattr,
4759                 struct nfs4_label *olabel)
4760 {
4761         struct nfs4_exception exception = { };
4762         int err;
4763
4764         do {
4765                 err = _nfs4_do_set_security_label(inode, ilabel,
4766                                 fattr, olabel);
4767                 trace_nfs4_set_security_label(inode, err);
4768                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4769                                 &exception);
4770         } while (exception.retry);
4771         return err;
4772 }
4773
4774 static int
4775 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4776 {
4777         struct nfs4_label ilabel, *olabel = NULL;
4778         struct nfs_fattr fattr;
4779         struct rpc_cred *cred;
4780         struct inode *inode = dentry->d_inode;
4781         int status;
4782
4783         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4784                 return -EOPNOTSUPP;
4785
4786         nfs_fattr_init(&fattr);
4787
4788         ilabel.pi = 0;
4789         ilabel.lfs = 0;
4790         ilabel.label = (char *)buf;
4791         ilabel.len = buflen;
4792
4793         cred = rpc_lookup_cred();
4794         if (IS_ERR(cred))
4795                 return PTR_ERR(cred);
4796
4797         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4798         if (IS_ERR(olabel)) {
4799                 status = -PTR_ERR(olabel);
4800                 goto out;
4801         }
4802
4803         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4804         if (status == 0)
4805                 nfs_setsecurity(inode, &fattr, olabel);
4806
4807         nfs4_label_free(olabel);
4808 out:
4809         put_rpccred(cred);
4810         return status;
4811 }
4812 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4813
4814
4815 static int
4816 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4817 {
4818         struct nfs_client *clp = server->nfs_client;
4819
4820         if (task->tk_status >= 0)
4821                 return 0;
4822         switch(task->tk_status) {
4823                 case -NFS4ERR_DELEG_REVOKED:
4824                 case -NFS4ERR_ADMIN_REVOKED:
4825                 case -NFS4ERR_BAD_STATEID:
4826                         if (state == NULL)
4827                                 break;
4828                         nfs_remove_bad_delegation(state->inode);
4829                 case -NFS4ERR_OPENMODE:
4830                         if (state == NULL)
4831                                 break;
4832                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4833                                 goto recovery_failed;
4834                         goto wait_on_recovery;
4835                 case -NFS4ERR_EXPIRED:
4836                         if (state != NULL) {
4837                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4838                                         goto recovery_failed;
4839                         }
4840                 case -NFS4ERR_STALE_STATEID:
4841                 case -NFS4ERR_STALE_CLIENTID:
4842                         nfs4_schedule_lease_recovery(clp);
4843                         goto wait_on_recovery;
4844                 case -NFS4ERR_MOVED:
4845                         if (nfs4_schedule_migration_recovery(server) < 0)
4846                                 goto recovery_failed;
4847                         goto wait_on_recovery;
4848                 case -NFS4ERR_LEASE_MOVED:
4849                         nfs4_schedule_lease_moved_recovery(clp);
4850                         goto wait_on_recovery;
4851 #if defined(CONFIG_NFS_V4_1)
4852                 case -NFS4ERR_BADSESSION:
4853                 case -NFS4ERR_BADSLOT:
4854                 case -NFS4ERR_BAD_HIGH_SLOT:
4855                 case -NFS4ERR_DEADSESSION:
4856                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4857                 case -NFS4ERR_SEQ_FALSE_RETRY:
4858                 case -NFS4ERR_SEQ_MISORDERED:
4859                         dprintk("%s ERROR %d, Reset session\n", __func__,
4860                                 task->tk_status);
4861                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4862                         goto wait_on_recovery;
4863 #endif /* CONFIG_NFS_V4_1 */
4864                 case -NFS4ERR_DELAY:
4865                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4866                 case -NFS4ERR_GRACE:
4867                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4868                 case -NFS4ERR_RETRY_UNCACHED_REP:
4869                 case -NFS4ERR_OLD_STATEID:
4870                         goto restart_call;
4871         }
4872         task->tk_status = nfs4_map_errors(task->tk_status);
4873         return 0;
4874 recovery_failed:
4875         task->tk_status = -EIO;
4876         return 0;
4877 wait_on_recovery:
4878         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4879         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4880                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4881         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4882                 goto recovery_failed;
4883 restart_call:
4884         task->tk_status = 0;
4885         return -EAGAIN;
4886 }
4887
4888 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4889                                     nfs4_verifier *bootverf)
4890 {
4891         __be32 verf[2];
4892
4893         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4894                 /* An impossible timestamp guarantees this value
4895                  * will never match a generated boot time. */
4896                 verf[0] = 0;
4897                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4898         } else {
4899                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4900                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4901                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4902         }
4903         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4904 }
4905
4906 static unsigned int
4907 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4908                                    char *buf, size_t len)
4909 {
4910         unsigned int result;
4911
4912         rcu_read_lock();
4913         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4914                                 clp->cl_ipaddr,
4915                                 rpc_peeraddr2str(clp->cl_rpcclient,
4916                                                         RPC_DISPLAY_ADDR),
4917                                 rpc_peeraddr2str(clp->cl_rpcclient,
4918                                                         RPC_DISPLAY_PROTO));
4919         rcu_read_unlock();
4920         return result;
4921 }
4922
4923 static unsigned int
4924 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4925                                 char *buf, size_t len)
4926 {
4927         const char *nodename = clp->cl_rpcclient->cl_nodename;
4928
4929         if (nfs4_client_id_uniquifier[0] != '\0')
4930                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4931                                 clp->rpc_ops->version,
4932                                 clp->cl_minorversion,
4933                                 nfs4_client_id_uniquifier,
4934                                 nodename);
4935         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4936                                 clp->rpc_ops->version, clp->cl_minorversion,
4937                                 nodename);
4938 }
4939
4940 /*
4941  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4942  * services.  Advertise one based on the address family of the
4943  * clientaddr.
4944  */
4945 static unsigned int
4946 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4947 {
4948         if (strchr(clp->cl_ipaddr, ':') != NULL)
4949                 return scnprintf(buf, len, "tcp6");
4950         else
4951                 return scnprintf(buf, len, "tcp");
4952 }
4953
4954 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4955 {
4956         struct nfs4_setclientid *sc = calldata;
4957
4958         if (task->tk_status == 0)
4959                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4960 }
4961
4962 static const struct rpc_call_ops nfs4_setclientid_ops = {
4963         .rpc_call_done = nfs4_setclientid_done,
4964 };
4965
4966 /**
4967  * nfs4_proc_setclientid - Negotiate client ID
4968  * @clp: state data structure
4969  * @program: RPC program for NFSv4 callback service
4970  * @port: IP port number for NFS4 callback service
4971  * @cred: RPC credential to use for this call
4972  * @res: where to place the result
4973  *
4974  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4975  */
4976 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4977                 unsigned short port, struct rpc_cred *cred,
4978                 struct nfs4_setclientid_res *res)
4979 {
4980         nfs4_verifier sc_verifier;
4981         struct nfs4_setclientid setclientid = {
4982                 .sc_verifier = &sc_verifier,
4983                 .sc_prog = program,
4984                 .sc_cb_ident = clp->cl_cb_ident,
4985         };
4986         struct rpc_message msg = {
4987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4988                 .rpc_argp = &setclientid,
4989                 .rpc_resp = res,
4990                 .rpc_cred = cred,
4991         };
4992         struct rpc_task *task;
4993         struct rpc_task_setup task_setup_data = {
4994                 .rpc_client = clp->cl_rpcclient,
4995                 .rpc_message = &msg,
4996                 .callback_ops = &nfs4_setclientid_ops,
4997                 .callback_data = &setclientid,
4998                 .flags = RPC_TASK_TIMEOUT,
4999         };
5000         int status;
5001
5002         /* nfs_client_id4 */
5003         nfs4_init_boot_verifier(clp, &sc_verifier);
5004         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5005                 setclientid.sc_name_len =
5006                                 nfs4_init_uniform_client_string(clp,
5007                                                 setclientid.sc_name,
5008                                                 sizeof(setclientid.sc_name));
5009         else
5010                 setclientid.sc_name_len =
5011                                 nfs4_init_nonuniform_client_string(clp,
5012                                                 setclientid.sc_name,
5013                                                 sizeof(setclientid.sc_name));
5014         /* cb_client4 */
5015         setclientid.sc_netid_len =
5016                                 nfs4_init_callback_netid(clp,
5017                                                 setclientid.sc_netid,
5018                                                 sizeof(setclientid.sc_netid));
5019         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5020                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5021                                 clp->cl_ipaddr, port >> 8, port & 255);
5022
5023         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5024                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5025                 setclientid.sc_name_len, setclientid.sc_name);
5026         task = rpc_run_task(&task_setup_data);
5027         if (IS_ERR(task)) {
5028                 status = PTR_ERR(task);
5029                 goto out;
5030         }
5031         status = task->tk_status;
5032         if (setclientid.sc_cred) {
5033                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5034                 put_rpccred(setclientid.sc_cred);
5035         }
5036         rpc_put_task(task);
5037 out:
5038         trace_nfs4_setclientid(clp, status);
5039         dprintk("NFS reply setclientid: %d\n", status);
5040         return status;
5041 }
5042
5043 /**
5044  * nfs4_proc_setclientid_confirm - Confirm client ID
5045  * @clp: state data structure
5046  * @res: result of a previous SETCLIENTID
5047  * @cred: RPC credential to use for this call
5048  *
5049  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5050  */
5051 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5052                 struct nfs4_setclientid_res *arg,
5053                 struct rpc_cred *cred)
5054 {
5055         struct rpc_message msg = {
5056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5057                 .rpc_argp = arg,
5058                 .rpc_cred = cred,
5059         };
5060         int status;
5061
5062         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5063                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5064                 clp->cl_clientid);
5065         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5066         trace_nfs4_setclientid_confirm(clp, status);
5067         dprintk("NFS reply setclientid_confirm: %d\n", status);
5068         return status;
5069 }
5070
5071 struct nfs4_delegreturndata {
5072         struct nfs4_delegreturnargs args;
5073         struct nfs4_delegreturnres res;
5074         struct nfs_fh fh;
5075         nfs4_stateid stateid;
5076         unsigned long timestamp;
5077         struct nfs_fattr fattr;
5078         int rpc_status;
5079         struct inode *inode;
5080         bool roc;
5081         u32 roc_barrier;
5082 };
5083
5084 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5085 {
5086         struct nfs4_delegreturndata *data = calldata;
5087
5088         if (!nfs4_sequence_done(task, &data->res.seq_res))
5089                 return;
5090
5091         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5092         switch (task->tk_status) {
5093         case 0:
5094                 renew_lease(data->res.server, data->timestamp);
5095         case -NFS4ERR_ADMIN_REVOKED:
5096         case -NFS4ERR_DELEG_REVOKED:
5097         case -NFS4ERR_BAD_STATEID:
5098         case -NFS4ERR_OLD_STATEID:
5099         case -NFS4ERR_STALE_STATEID:
5100         case -NFS4ERR_EXPIRED:
5101                 task->tk_status = 0;
5102                 if (data->roc)
5103                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5104                 break;
5105         default:
5106                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5107                                 -EAGAIN) {
5108                         rpc_restart_call_prepare(task);
5109                         return;
5110                 }
5111         }
5112         data->rpc_status = task->tk_status;
5113 }
5114
5115 static void nfs4_delegreturn_release(void *calldata)
5116 {
5117         struct nfs4_delegreturndata *data = calldata;
5118
5119         if (data->roc)
5120                 pnfs_roc_release(data->inode);
5121         kfree(calldata);
5122 }
5123
5124 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5125 {
5126         struct nfs4_delegreturndata *d_data;
5127
5128         d_data = (struct nfs4_delegreturndata *)data;
5129
5130         if (d_data->roc &&
5131             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5132                 return;
5133
5134         nfs4_setup_sequence(d_data->res.server,
5135                         &d_data->args.seq_args,
5136                         &d_data->res.seq_res,
5137                         task);
5138 }
5139
5140 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5141         .rpc_call_prepare = nfs4_delegreturn_prepare,
5142         .rpc_call_done = nfs4_delegreturn_done,
5143         .rpc_release = nfs4_delegreturn_release,
5144 };
5145
5146 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5147 {
5148         struct nfs4_delegreturndata *data;
5149         struct nfs_server *server = NFS_SERVER(inode);
5150         struct rpc_task *task;
5151         struct rpc_message msg = {
5152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5153                 .rpc_cred = cred,
5154         };
5155         struct rpc_task_setup task_setup_data = {
5156                 .rpc_client = server->client,
5157                 .rpc_message = &msg,
5158                 .callback_ops = &nfs4_delegreturn_ops,
5159                 .flags = RPC_TASK_ASYNC,
5160         };
5161         int status = 0;
5162
5163         data = kzalloc(sizeof(*data), GFP_NOFS);
5164         if (data == NULL)
5165                 return -ENOMEM;
5166         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5167         data->args.fhandle = &data->fh;
5168         data->args.stateid = &data->stateid;
5169         data->args.bitmask = server->cache_consistency_bitmask;
5170         nfs_copy_fh(&data->fh, NFS_FH(inode));
5171         nfs4_stateid_copy(&data->stateid, stateid);
5172         data->res.fattr = &data->fattr;
5173         data->res.server = server;
5174         nfs_fattr_init(data->res.fattr);
5175         data->timestamp = jiffies;
5176         data->rpc_status = 0;
5177         data->inode = inode;
5178         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5179                     pnfs_roc(inode) : false;
5180
5181         task_setup_data.callback_data = data;
5182         msg.rpc_argp = &data->args;
5183         msg.rpc_resp = &data->res;
5184         task = rpc_run_task(&task_setup_data);
5185         if (IS_ERR(task))
5186                 return PTR_ERR(task);
5187         if (!issync)
5188                 goto out;
5189         status = nfs4_wait_for_completion_rpc_task(task);
5190         if (status != 0)
5191                 goto out;
5192         status = data->rpc_status;
5193         if (status == 0)
5194                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5195         else
5196                 nfs_refresh_inode(inode, &data->fattr);
5197 out:
5198         rpc_put_task(task);
5199         return status;
5200 }
5201
5202 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5203 {
5204         struct nfs_server *server = NFS_SERVER(inode);
5205         struct nfs4_exception exception = { };
5206         int err;
5207         do {
5208                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5209                 trace_nfs4_delegreturn(inode, err);
5210                 switch (err) {
5211                         case -NFS4ERR_STALE_STATEID:
5212                         case -NFS4ERR_EXPIRED:
5213                         case 0:
5214                                 return 0;
5215                 }
5216                 err = nfs4_handle_exception(server, err, &exception);
5217         } while (exception.retry);
5218         return err;
5219 }
5220
5221 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5222 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5223
5224 /*
5225  * sleep, with exponential backoff, and retry the LOCK operation.
5226  */
5227 static unsigned long
5228 nfs4_set_lock_task_retry(unsigned long timeout)
5229 {
5230         freezable_schedule_timeout_killable_unsafe(timeout);
5231         timeout <<= 1;
5232         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5233                 return NFS4_LOCK_MAXTIMEOUT;
5234         return timeout;
5235 }
5236
5237 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5238 {
5239         struct inode *inode = state->inode;
5240         struct nfs_server *server = NFS_SERVER(inode);
5241         struct nfs_client *clp = server->nfs_client;
5242         struct nfs_lockt_args arg = {
5243                 .fh = NFS_FH(inode),
5244                 .fl = request,
5245         };
5246         struct nfs_lockt_res res = {
5247                 .denied = request,
5248         };
5249         struct rpc_message msg = {
5250                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5251                 .rpc_argp       = &arg,
5252                 .rpc_resp       = &res,
5253                 .rpc_cred       = state->owner->so_cred,
5254         };
5255         struct nfs4_lock_state *lsp;
5256         int status;
5257
5258         arg.lock_owner.clientid = clp->cl_clientid;
5259         status = nfs4_set_lock_state(state, request);
5260         if (status != 0)
5261                 goto out;
5262         lsp = request->fl_u.nfs4_fl.owner;
5263         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5264         arg.lock_owner.s_dev = server->s_dev;
5265         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5266         switch (status) {
5267                 case 0:
5268                         request->fl_type = F_UNLCK;
5269                         break;
5270                 case -NFS4ERR_DENIED:
5271                         status = 0;
5272         }
5273         request->fl_ops->fl_release_private(request);
5274         request->fl_ops = NULL;
5275 out:
5276         return status;
5277 }
5278
5279 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5280 {
5281         struct nfs4_exception exception = { };
5282         int err;
5283
5284         do {
5285                 err = _nfs4_proc_getlk(state, cmd, request);
5286                 trace_nfs4_get_lock(request, state, cmd, err);
5287                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5288                                 &exception);
5289         } while (exception.retry);
5290         return err;
5291 }
5292
5293 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5294 {
5295         int res = 0;
5296         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5297                 case FL_POSIX:
5298                         res = posix_lock_file_wait(file, fl);
5299                         break;
5300                 case FL_FLOCK:
5301                         res = flock_lock_file_wait(file, fl);
5302                         break;
5303                 default:
5304                         BUG();
5305         }
5306         return res;
5307 }
5308
5309 struct nfs4_unlockdata {
5310         struct nfs_locku_args arg;
5311         struct nfs_locku_res res;
5312         struct nfs4_lock_state *lsp;
5313         struct nfs_open_context *ctx;
5314         struct file_lock fl;
5315         const struct nfs_server *server;
5316         unsigned long timestamp;
5317 };
5318
5319 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5320                 struct nfs_open_context *ctx,
5321                 struct nfs4_lock_state *lsp,
5322                 struct nfs_seqid *seqid)
5323 {
5324         struct nfs4_unlockdata *p;
5325         struct inode *inode = lsp->ls_state->inode;
5326
5327         p = kzalloc(sizeof(*p), GFP_NOFS);
5328         if (p == NULL)
5329                 return NULL;
5330         p->arg.fh = NFS_FH(inode);
5331         p->arg.fl = &p->fl;
5332         p->arg.seqid = seqid;
5333         p->res.seqid = seqid;
5334         p->arg.stateid = &lsp->ls_stateid;
5335         p->lsp = lsp;
5336         atomic_inc(&lsp->ls_count);
5337         /* Ensure we don't close file until we're done freeing locks! */
5338         p->ctx = get_nfs_open_context(ctx);
5339         memcpy(&p->fl, fl, sizeof(p->fl));
5340         p->server = NFS_SERVER(inode);
5341         return p;
5342 }
5343
5344 static void nfs4_locku_release_calldata(void *data)
5345 {
5346         struct nfs4_unlockdata *calldata = data;
5347         nfs_free_seqid(calldata->arg.seqid);
5348         nfs4_put_lock_state(calldata->lsp);
5349         put_nfs_open_context(calldata->ctx);
5350         kfree(calldata);
5351 }
5352
5353 static void nfs4_locku_done(struct rpc_task *task, void *data)
5354 {
5355         struct nfs4_unlockdata *calldata = data;
5356
5357         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5358                 return;
5359         switch (task->tk_status) {
5360                 case 0:
5361                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5362                                         &calldata->res.stateid);
5363                         renew_lease(calldata->server, calldata->timestamp);
5364                         break;
5365                 case -NFS4ERR_BAD_STATEID:
5366                 case -NFS4ERR_OLD_STATEID:
5367                 case -NFS4ERR_STALE_STATEID:
5368                 case -NFS4ERR_EXPIRED:
5369                         break;
5370                 default:
5371                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5372                                 rpc_restart_call_prepare(task);
5373         }
5374         nfs_release_seqid(calldata->arg.seqid);
5375 }
5376
5377 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5378 {
5379         struct nfs4_unlockdata *calldata = data;
5380
5381         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5382                 goto out_wait;
5383         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5384                 /* Note: exit _without_ running nfs4_locku_done */
5385                 goto out_no_action;
5386         }
5387         calldata->timestamp = jiffies;
5388         if (nfs4_setup_sequence(calldata->server,
5389                                 &calldata->arg.seq_args,
5390                                 &calldata->res.seq_res,
5391                                 task) != 0)
5392                 nfs_release_seqid(calldata->arg.seqid);
5393         return;
5394 out_no_action:
5395         task->tk_action = NULL;
5396 out_wait:
5397         nfs4_sequence_done(task, &calldata->res.seq_res);
5398 }
5399
5400 static const struct rpc_call_ops nfs4_locku_ops = {
5401         .rpc_call_prepare = nfs4_locku_prepare,
5402         .rpc_call_done = nfs4_locku_done,
5403         .rpc_release = nfs4_locku_release_calldata,
5404 };
5405
5406 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5407                 struct nfs_open_context *ctx,
5408                 struct nfs4_lock_state *lsp,
5409                 struct nfs_seqid *seqid)
5410 {
5411         struct nfs4_unlockdata *data;
5412         struct rpc_message msg = {
5413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5414                 .rpc_cred = ctx->cred,
5415         };
5416         struct rpc_task_setup task_setup_data = {
5417                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5418                 .rpc_message = &msg,
5419                 .callback_ops = &nfs4_locku_ops,
5420                 .workqueue = nfsiod_workqueue,
5421                 .flags = RPC_TASK_ASYNC,
5422         };
5423
5424         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5425                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5426
5427         /* Ensure this is an unlock - when canceling a lock, the
5428          * canceled lock is passed in, and it won't be an unlock.
5429          */
5430         fl->fl_type = F_UNLCK;
5431
5432         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5433         if (data == NULL) {
5434                 nfs_free_seqid(seqid);
5435                 return ERR_PTR(-ENOMEM);
5436         }
5437
5438         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5439         msg.rpc_argp = &data->arg;
5440         msg.rpc_resp = &data->res;
5441         task_setup_data.callback_data = data;
5442         return rpc_run_task(&task_setup_data);
5443 }
5444
5445 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5446 {
5447         struct inode *inode = state->inode;
5448         struct nfs4_state_owner *sp = state->owner;
5449         struct nfs_inode *nfsi = NFS_I(inode);
5450         struct nfs_seqid *seqid;
5451         struct nfs4_lock_state *lsp;
5452         struct rpc_task *task;
5453         int status = 0;
5454         unsigned char fl_flags = request->fl_flags;
5455
5456         status = nfs4_set_lock_state(state, request);
5457         /* Unlock _before_ we do the RPC call */
5458         request->fl_flags |= FL_EXISTS;
5459         /* Exclude nfs_delegation_claim_locks() */
5460         mutex_lock(&sp->so_delegreturn_mutex);
5461         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5462         down_read(&nfsi->rwsem);
5463         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5464                 up_read(&nfsi->rwsem);
5465                 mutex_unlock(&sp->so_delegreturn_mutex);
5466                 goto out;
5467         }
5468         up_read(&nfsi->rwsem);
5469         mutex_unlock(&sp->so_delegreturn_mutex);
5470         if (status != 0)
5471                 goto out;
5472         /* Is this a delegated lock? */
5473         lsp = request->fl_u.nfs4_fl.owner;
5474         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5475                 goto out;
5476         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5477         status = -ENOMEM;
5478         if (seqid == NULL)
5479                 goto out;
5480         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5481         status = PTR_ERR(task);
5482         if (IS_ERR(task))
5483                 goto out;
5484         status = nfs4_wait_for_completion_rpc_task(task);
5485         rpc_put_task(task);
5486 out:
5487         request->fl_flags = fl_flags;
5488         trace_nfs4_unlock(request, state, F_SETLK, status);
5489         return status;
5490 }
5491
5492 struct nfs4_lockdata {
5493         struct nfs_lock_args arg;
5494         struct nfs_lock_res res;
5495         struct nfs4_lock_state *lsp;
5496         struct nfs_open_context *ctx;
5497         struct file_lock fl;
5498         unsigned long timestamp;
5499         int rpc_status;
5500         int cancelled;
5501         struct nfs_server *server;
5502 };
5503
5504 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5505                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5506                 gfp_t gfp_mask)
5507 {
5508         struct nfs4_lockdata *p;
5509         struct inode *inode = lsp->ls_state->inode;
5510         struct nfs_server *server = NFS_SERVER(inode);
5511
5512         p = kzalloc(sizeof(*p), gfp_mask);
5513         if (p == NULL)
5514                 return NULL;
5515
5516         p->arg.fh = NFS_FH(inode);
5517         p->arg.fl = &p->fl;
5518         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5519         if (p->arg.open_seqid == NULL)
5520                 goto out_free;
5521         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5522         if (p->arg.lock_seqid == NULL)
5523                 goto out_free_seqid;
5524         p->arg.lock_stateid = &lsp->ls_stateid;
5525         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5526         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5527         p->arg.lock_owner.s_dev = server->s_dev;
5528         p->res.lock_seqid = p->arg.lock_seqid;
5529         p->lsp = lsp;
5530         p->server = server;
5531         atomic_inc(&lsp->ls_count);
5532         p->ctx = get_nfs_open_context(ctx);
5533         memcpy(&p->fl, fl, sizeof(p->fl));
5534         return p;
5535 out_free_seqid:
5536         nfs_free_seqid(p->arg.open_seqid);
5537 out_free:
5538         kfree(p);
5539         return NULL;
5540 }
5541
5542 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5543 {
5544         struct nfs4_lockdata *data = calldata;
5545         struct nfs4_state *state = data->lsp->ls_state;
5546
5547         dprintk("%s: begin!\n", __func__);
5548         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5549                 goto out_wait;
5550         /* Do we need to do an open_to_lock_owner? */
5551         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5552                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5553                         goto out_release_lock_seqid;
5554                 }
5555                 data->arg.open_stateid = &state->open_stateid;
5556                 data->arg.new_lock_owner = 1;
5557                 data->res.open_seqid = data->arg.open_seqid;
5558         } else
5559                 data->arg.new_lock_owner = 0;
5560         if (!nfs4_valid_open_stateid(state)) {
5561                 data->rpc_status = -EBADF;
5562                 task->tk_action = NULL;
5563                 goto out_release_open_seqid;
5564         }
5565         data->timestamp = jiffies;
5566         if (nfs4_setup_sequence(data->server,
5567                                 &data->arg.seq_args,
5568                                 &data->res.seq_res,
5569                                 task) == 0)
5570                 return;
5571 out_release_open_seqid:
5572         nfs_release_seqid(data->arg.open_seqid);
5573 out_release_lock_seqid:
5574         nfs_release_seqid(data->arg.lock_seqid);
5575 out_wait:
5576         nfs4_sequence_done(task, &data->res.seq_res);
5577         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5578 }
5579
5580 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5581 {
5582         struct nfs4_lockdata *data = calldata;
5583
5584         dprintk("%s: begin!\n", __func__);
5585
5586         if (!nfs4_sequence_done(task, &data->res.seq_res))
5587                 return;
5588
5589         data->rpc_status = task->tk_status;
5590         if (data->arg.new_lock_owner != 0) {
5591                 if (data->rpc_status == 0)
5592                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5593                 else
5594                         goto out;
5595         }
5596         if (data->rpc_status == 0) {
5597                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5598                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5599                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5600         }
5601 out:
5602         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5603 }
5604
5605 static void nfs4_lock_release(void *calldata)
5606 {
5607         struct nfs4_lockdata *data = calldata;
5608
5609         dprintk("%s: begin!\n", __func__);
5610         nfs_free_seqid(data->arg.open_seqid);
5611         if (data->cancelled != 0) {
5612                 struct rpc_task *task;
5613                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5614                                 data->arg.lock_seqid);
5615                 if (!IS_ERR(task))
5616                         rpc_put_task_async(task);
5617                 dprintk("%s: cancelling lock!\n", __func__);
5618         } else
5619                 nfs_free_seqid(data->arg.lock_seqid);
5620         nfs4_put_lock_state(data->lsp);
5621         put_nfs_open_context(data->ctx);
5622         kfree(data);
5623         dprintk("%s: done!\n", __func__);
5624 }
5625
5626 static const struct rpc_call_ops nfs4_lock_ops = {
5627         .rpc_call_prepare = nfs4_lock_prepare,
5628         .rpc_call_done = nfs4_lock_done,
5629         .rpc_release = nfs4_lock_release,
5630 };
5631
5632 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5633 {
5634         switch (error) {
5635         case -NFS4ERR_ADMIN_REVOKED:
5636         case -NFS4ERR_BAD_STATEID:
5637                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5638                 if (new_lock_owner != 0 ||
5639                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5640                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5641                 break;
5642         case -NFS4ERR_STALE_STATEID:
5643                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5644         case -NFS4ERR_EXPIRED:
5645                 nfs4_schedule_lease_recovery(server->nfs_client);
5646         };
5647 }
5648
5649 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5650 {
5651         struct nfs4_lockdata *data;
5652         struct rpc_task *task;
5653         struct rpc_message msg = {
5654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5655                 .rpc_cred = state->owner->so_cred,
5656         };
5657         struct rpc_task_setup task_setup_data = {
5658                 .rpc_client = NFS_CLIENT(state->inode),
5659                 .rpc_message = &msg,
5660                 .callback_ops = &nfs4_lock_ops,
5661                 .workqueue = nfsiod_workqueue,
5662                 .flags = RPC_TASK_ASYNC,
5663         };
5664         int ret;
5665
5666         dprintk("%s: begin!\n", __func__);
5667         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5668                         fl->fl_u.nfs4_fl.owner,
5669                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5670         if (data == NULL)
5671                 return -ENOMEM;
5672         if (IS_SETLKW(cmd))
5673                 data->arg.block = 1;
5674         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5675         msg.rpc_argp = &data->arg;
5676         msg.rpc_resp = &data->res;
5677         task_setup_data.callback_data = data;
5678         if (recovery_type > NFS_LOCK_NEW) {
5679                 if (recovery_type == NFS_LOCK_RECLAIM)
5680                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5681                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5682         }
5683         task = rpc_run_task(&task_setup_data);
5684         if (IS_ERR(task))
5685                 return PTR_ERR(task);
5686         ret = nfs4_wait_for_completion_rpc_task(task);
5687         if (ret == 0) {
5688                 ret = data->rpc_status;
5689                 if (ret)
5690                         nfs4_handle_setlk_error(data->server, data->lsp,
5691                                         data->arg.new_lock_owner, ret);
5692         } else
5693                 data->cancelled = 1;
5694         rpc_put_task(task);
5695         dprintk("%s: done, ret = %d!\n", __func__, ret);
5696         return ret;
5697 }
5698
5699 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5700 {
5701         struct nfs_server *server = NFS_SERVER(state->inode);
5702         struct nfs4_exception exception = {
5703                 .inode = state->inode,
5704         };
5705         int err;
5706
5707         do {
5708                 /* Cache the lock if possible... */
5709                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5710                         return 0;
5711                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5712                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5713                 if (err != -NFS4ERR_DELAY)
5714                         break;
5715                 nfs4_handle_exception(server, err, &exception);
5716         } while (exception.retry);
5717         return err;
5718 }
5719
5720 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5721 {
5722         struct nfs_server *server = NFS_SERVER(state->inode);
5723         struct nfs4_exception exception = {
5724                 .inode = state->inode,
5725         };
5726         int err;
5727
5728         err = nfs4_set_lock_state(state, request);
5729         if (err != 0)
5730                 return err;
5731         if (!recover_lost_locks) {
5732                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5733                 return 0;
5734         }
5735         do {
5736                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5737                         return 0;
5738                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5739                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5740                 switch (err) {
5741                 default:
5742                         goto out;
5743                 case -NFS4ERR_GRACE:
5744                 case -NFS4ERR_DELAY:
5745                         nfs4_handle_exception(server, err, &exception);
5746                         err = 0;
5747                 }
5748         } while (exception.retry);
5749 out:
5750         return err;
5751 }
5752
5753 #if defined(CONFIG_NFS_V4_1)
5754 /**
5755  * nfs41_check_expired_locks - possibly free a lock stateid
5756  *
5757  * @state: NFSv4 state for an inode
5758  *
5759  * Returns NFS_OK if recovery for this stateid is now finished.
5760  * Otherwise a negative NFS4ERR value is returned.
5761  */
5762 static int nfs41_check_expired_locks(struct nfs4_state *state)
5763 {
5764         int status, ret = -NFS4ERR_BAD_STATEID;
5765         struct nfs4_lock_state *lsp;
5766         struct nfs_server *server = NFS_SERVER(state->inode);
5767
5768         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5769                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5770                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5771
5772                         status = nfs41_test_stateid(server,
5773                                         &lsp->ls_stateid,
5774                                         cred);
5775                         trace_nfs4_test_lock_stateid(state, lsp, status);
5776                         if (status != NFS_OK) {
5777                                 /* Free the stateid unless the server
5778                                  * informs us the stateid is unrecognized. */
5779                                 if (status != -NFS4ERR_BAD_STATEID)
5780                                         nfs41_free_stateid(server,
5781                                                         &lsp->ls_stateid,
5782                                                         cred);
5783                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5784                                 ret = status;
5785                         }
5786                 }
5787         };
5788
5789         return ret;
5790 }
5791
5792 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5793 {
5794         int status = NFS_OK;
5795
5796         if (test_bit(LK_STATE_IN_USE, &state->flags))
5797                 status = nfs41_check_expired_locks(state);
5798         if (status != NFS_OK)
5799                 status = nfs4_lock_expired(state, request);
5800         return status;
5801 }
5802 #endif
5803
5804 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5805 {
5806         struct nfs4_state_owner *sp = state->owner;
5807         struct nfs_inode *nfsi = NFS_I(state->inode);
5808         unsigned char fl_flags = request->fl_flags;
5809         unsigned int seq;
5810         int status = -ENOLCK;
5811
5812         if ((fl_flags & FL_POSIX) &&
5813                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5814                 goto out;
5815         /* Is this a delegated open? */
5816         status = nfs4_set_lock_state(state, request);
5817         if (status != 0)
5818                 goto out;
5819         request->fl_flags |= FL_ACCESS;
5820         status = do_vfs_lock(request->fl_file, request);
5821         if (status < 0)
5822                 goto out;
5823         down_read(&nfsi->rwsem);
5824         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5825                 /* Yes: cache locks! */
5826                 /* ...but avoid races with delegation recall... */
5827                 request->fl_flags = fl_flags & ~FL_SLEEP;
5828                 status = do_vfs_lock(request->fl_file, request);
5829                 goto out_unlock;
5830         }
5831         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5832         up_read(&nfsi->rwsem);
5833         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5834         if (status != 0)
5835                 goto out;
5836         down_read(&nfsi->rwsem);
5837         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5838                 status = -NFS4ERR_DELAY;
5839                 goto out_unlock;
5840         }
5841         /* Note: we always want to sleep here! */
5842         request->fl_flags = fl_flags | FL_SLEEP;
5843         if (do_vfs_lock(request->fl_file, request) < 0)
5844                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5845                         "manager!\n", __func__);
5846 out_unlock:
5847         up_read(&nfsi->rwsem);
5848 out:
5849         request->fl_flags = fl_flags;
5850         return status;
5851 }
5852
5853 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5854 {
5855         struct nfs4_exception exception = {
5856                 .state = state,
5857                 .inode = state->inode,
5858         };
5859         int err;
5860
5861         do {
5862                 err = _nfs4_proc_setlk(state, cmd, request);
5863                 trace_nfs4_set_lock(request, state, cmd, err);
5864                 if (err == -NFS4ERR_DENIED)
5865                         err = -EAGAIN;
5866                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5867                                 err, &exception);
5868         } while (exception.retry);
5869         return err;
5870 }
5871
5872 static int
5873 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5874 {
5875         struct nfs_open_context *ctx;
5876         struct nfs4_state *state;
5877         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5878         int status;
5879
5880         /* verify open state */
5881         ctx = nfs_file_open_context(filp);
5882         state = ctx->state;
5883
5884         if (request->fl_start < 0 || request->fl_end < 0)
5885                 return -EINVAL;
5886
5887         if (IS_GETLK(cmd)) {
5888                 if (state != NULL)
5889                         return nfs4_proc_getlk(state, F_GETLK, request);
5890                 return 0;
5891         }
5892
5893         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5894                 return -EINVAL;
5895
5896         if (request->fl_type == F_UNLCK) {
5897                 if (state != NULL)
5898                         return nfs4_proc_unlck(state, cmd, request);
5899                 return 0;
5900         }
5901
5902         if (state == NULL)
5903                 return -ENOLCK;
5904         /*
5905          * Don't rely on the VFS having checked the file open mode,
5906          * since it won't do this for flock() locks.
5907          */
5908         switch (request->fl_type) {
5909         case F_RDLCK:
5910                 if (!(filp->f_mode & FMODE_READ))
5911                         return -EBADF;
5912                 break;
5913         case F_WRLCK:
5914                 if (!(filp->f_mode & FMODE_WRITE))
5915                         return -EBADF;
5916         }
5917
5918         do {
5919                 status = nfs4_proc_setlk(state, cmd, request);
5920                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5921                         break;
5922                 timeout = nfs4_set_lock_task_retry(timeout);
5923                 status = -ERESTARTSYS;
5924                 if (signalled())
5925                         break;
5926         } while(status < 0);
5927         return status;
5928 }
5929
5930 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5931 {
5932         struct nfs_server *server = NFS_SERVER(state->inode);
5933         int err;
5934
5935         err = nfs4_set_lock_state(state, fl);
5936         if (err != 0)
5937                 return err;
5938         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5939         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5940 }
5941
5942 struct nfs_release_lockowner_data {
5943         struct nfs4_lock_state *lsp;
5944         struct nfs_server *server;
5945         struct nfs_release_lockowner_args args;
5946         struct nfs_release_lockowner_res res;
5947         unsigned long timestamp;
5948 };
5949
5950 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5951 {
5952         struct nfs_release_lockowner_data *data = calldata;
5953         struct nfs_server *server = data->server;
5954         nfs40_setup_sequence(server, &data->args.seq_args,
5955                                 &data->res.seq_res, task);
5956         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5957         data->timestamp = jiffies;
5958 }
5959
5960 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5961 {
5962         struct nfs_release_lockowner_data *data = calldata;
5963         struct nfs_server *server = data->server;
5964
5965         nfs40_sequence_done(task, &data->res.seq_res);
5966
5967         switch (task->tk_status) {
5968         case 0:
5969                 renew_lease(server, data->timestamp);
5970                 break;
5971         case -NFS4ERR_STALE_CLIENTID:
5972         case -NFS4ERR_EXPIRED:
5973                 nfs4_schedule_lease_recovery(server->nfs_client);
5974                 break;
5975         case -NFS4ERR_LEASE_MOVED:
5976         case -NFS4ERR_DELAY:
5977                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5978                         rpc_restart_call_prepare(task);
5979         }
5980 }
5981
5982 static void nfs4_release_lockowner_release(void *calldata)
5983 {
5984         struct nfs_release_lockowner_data *data = calldata;
5985         nfs4_free_lock_state(data->server, data->lsp);
5986         kfree(calldata);
5987 }
5988
5989 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5990         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5991         .rpc_call_done = nfs4_release_lockowner_done,
5992         .rpc_release = nfs4_release_lockowner_release,
5993 };
5994
5995 static void
5996 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5997 {
5998         struct nfs_release_lockowner_data *data;
5999         struct rpc_message msg = {
6000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6001         };
6002
6003         if (server->nfs_client->cl_mvops->minor_version != 0)
6004                 return;
6005
6006         data = kmalloc(sizeof(*data), GFP_NOFS);
6007         if (!data)
6008                 return;
6009         data->lsp = lsp;
6010         data->server = server;
6011         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6012         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6013         data->args.lock_owner.s_dev = server->s_dev;
6014
6015         msg.rpc_argp = &data->args;
6016         msg.rpc_resp = &data->res;
6017         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6018         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6019 }
6020
6021 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6022
6023 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6024                                    const void *buf, size_t buflen,
6025                                    int flags, int type)
6026 {
6027         if (strcmp(key, "") != 0)
6028                 return -EINVAL;
6029
6030         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6031 }
6032
6033 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6034                                    void *buf, size_t buflen, int type)
6035 {
6036         if (strcmp(key, "") != 0)
6037                 return -EINVAL;
6038
6039         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6040 }
6041
6042 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6043                                        size_t list_len, const char *name,
6044                                        size_t name_len, int type)
6045 {
6046         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6047
6048         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6049                 return 0;
6050
6051         if (list && len <= list_len)
6052                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6053         return len;
6054 }
6055
6056 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6057 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6058 {
6059         return server->caps & NFS_CAP_SECURITY_LABEL;
6060 }
6061
6062 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6063                                    const void *buf, size_t buflen,
6064                                    int flags, int type)
6065 {
6066         if (security_ismaclabel(key))
6067                 return nfs4_set_security_label(dentry, buf, buflen);
6068
6069         return -EOPNOTSUPP;
6070 }
6071
6072 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6073                                    void *buf, size_t buflen, int type)
6074 {
6075         if (security_ismaclabel(key))
6076                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6077         return -EOPNOTSUPP;
6078 }
6079
6080 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6081                                        size_t list_len, const char *name,
6082                                        size_t name_len, int type)
6083 {
6084         size_t len = 0;
6085
6086         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6087                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6088                 if (list && len <= list_len)
6089                         security_inode_listsecurity(dentry->d_inode, list, len);
6090         }
6091         return len;
6092 }
6093
6094 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6095         .prefix = XATTR_SECURITY_PREFIX,
6096         .list   = nfs4_xattr_list_nfs4_label,
6097         .get    = nfs4_xattr_get_nfs4_label,
6098         .set    = nfs4_xattr_set_nfs4_label,
6099 };
6100 #endif
6101
6102
6103 /*
6104  * nfs_fhget will use either the mounted_on_fileid or the fileid
6105  */
6106 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6107 {
6108         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6109                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6110               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6111               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6112                 return;
6113
6114         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6115                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6116         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6117         fattr->nlink = 2;
6118 }
6119
6120 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6121                                    const struct qstr *name,
6122                                    struct nfs4_fs_locations *fs_locations,
6123                                    struct page *page)
6124 {
6125         struct nfs_server *server = NFS_SERVER(dir);
6126         u32 bitmask[3] = {
6127                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6128         };
6129         struct nfs4_fs_locations_arg args = {
6130                 .dir_fh = NFS_FH(dir),
6131                 .name = name,
6132                 .page = page,
6133                 .bitmask = bitmask,
6134         };
6135         struct nfs4_fs_locations_res res = {
6136                 .fs_locations = fs_locations,
6137         };
6138         struct rpc_message msg = {
6139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6140                 .rpc_argp = &args,
6141                 .rpc_resp = &res,
6142         };
6143         int status;
6144
6145         dprintk("%s: start\n", __func__);
6146
6147         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6148          * is not supported */
6149         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6150                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6151         else
6152                 bitmask[0] |= FATTR4_WORD0_FILEID;
6153
6154         nfs_fattr_init(&fs_locations->fattr);
6155         fs_locations->server = server;
6156         fs_locations->nlocations = 0;
6157         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6158         dprintk("%s: returned status = %d\n", __func__, status);
6159         return status;
6160 }
6161
6162 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6163                            const struct qstr *name,
6164                            struct nfs4_fs_locations *fs_locations,
6165                            struct page *page)
6166 {
6167         struct nfs4_exception exception = { };
6168         int err;
6169         do {
6170                 err = _nfs4_proc_fs_locations(client, dir, name,
6171                                 fs_locations, page);
6172                 trace_nfs4_get_fs_locations(dir, name, err);
6173                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6174                                 &exception);
6175         } while (exception.retry);
6176         return err;
6177 }
6178
6179 /*
6180  * This operation also signals the server that this client is
6181  * performing migration recovery.  The server can stop returning
6182  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6183  * appended to this compound to identify the client ID which is
6184  * performing recovery.
6185  */
6186 static int _nfs40_proc_get_locations(struct inode *inode,
6187                                      struct nfs4_fs_locations *locations,
6188                                      struct page *page, struct rpc_cred *cred)
6189 {
6190         struct nfs_server *server = NFS_SERVER(inode);
6191         struct rpc_clnt *clnt = server->client;
6192         u32 bitmask[2] = {
6193                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6194         };
6195         struct nfs4_fs_locations_arg args = {
6196                 .clientid       = server->nfs_client->cl_clientid,
6197                 .fh             = NFS_FH(inode),
6198                 .page           = page,
6199                 .bitmask        = bitmask,
6200                 .migration      = 1,            /* skip LOOKUP */
6201                 .renew          = 1,            /* append RENEW */
6202         };
6203         struct nfs4_fs_locations_res res = {
6204                 .fs_locations   = locations,
6205                 .migration      = 1,
6206                 .renew          = 1,
6207         };
6208         struct rpc_message msg = {
6209                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6210                 .rpc_argp       = &args,
6211                 .rpc_resp       = &res,
6212                 .rpc_cred       = cred,
6213         };
6214         unsigned long now = jiffies;
6215         int status;
6216
6217         nfs_fattr_init(&locations->fattr);
6218         locations->server = server;
6219         locations->nlocations = 0;
6220
6221         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6222         nfs4_set_sequence_privileged(&args.seq_args);
6223         status = nfs4_call_sync_sequence(clnt, server, &msg,
6224                                         &args.seq_args, &res.seq_res);
6225         if (status)
6226                 return status;
6227
6228         renew_lease(server, now);
6229         return 0;
6230 }
6231
6232 #ifdef CONFIG_NFS_V4_1
6233
6234 /*
6235  * This operation also signals the server that this client is
6236  * performing migration recovery.  The server can stop asserting
6237  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6238  * performing this operation is identified in the SEQUENCE
6239  * operation in this compound.
6240  *
6241  * When the client supports GETATTR(fs_locations_info), it can
6242  * be plumbed in here.
6243  */
6244 static int _nfs41_proc_get_locations(struct inode *inode,
6245                                      struct nfs4_fs_locations *locations,
6246                                      struct page *page, struct rpc_cred *cred)
6247 {
6248         struct nfs_server *server = NFS_SERVER(inode);
6249         struct rpc_clnt *clnt = server->client;
6250         u32 bitmask[2] = {
6251                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6252         };
6253         struct nfs4_fs_locations_arg args = {
6254                 .fh             = NFS_FH(inode),
6255                 .page           = page,
6256                 .bitmask        = bitmask,
6257                 .migration      = 1,            /* skip LOOKUP */
6258         };
6259         struct nfs4_fs_locations_res res = {
6260                 .fs_locations   = locations,
6261                 .migration      = 1,
6262         };
6263         struct rpc_message msg = {
6264                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6265                 .rpc_argp       = &args,
6266                 .rpc_resp       = &res,
6267                 .rpc_cred       = cred,
6268         };
6269         int status;
6270
6271         nfs_fattr_init(&locations->fattr);
6272         locations->server = server;
6273         locations->nlocations = 0;
6274
6275         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6276         nfs4_set_sequence_privileged(&args.seq_args);
6277         status = nfs4_call_sync_sequence(clnt, server, &msg,
6278                                         &args.seq_args, &res.seq_res);
6279         if (status == NFS4_OK &&
6280             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6281                 status = -NFS4ERR_LEASE_MOVED;
6282         return status;
6283 }
6284
6285 #endif  /* CONFIG_NFS_V4_1 */
6286
6287 /**
6288  * nfs4_proc_get_locations - discover locations for a migrated FSID
6289  * @inode: inode on FSID that is migrating
6290  * @locations: result of query
6291  * @page: buffer
6292  * @cred: credential to use for this operation
6293  *
6294  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6295  * operation failed, or a negative errno if a local error occurred.
6296  *
6297  * On success, "locations" is filled in, but if the server has
6298  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6299  * asserted.
6300  *
6301  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6302  * from this client that require migration recovery.
6303  */
6304 int nfs4_proc_get_locations(struct inode *inode,
6305                             struct nfs4_fs_locations *locations,
6306                             struct page *page, struct rpc_cred *cred)
6307 {
6308         struct nfs_server *server = NFS_SERVER(inode);
6309         struct nfs_client *clp = server->nfs_client;
6310         const struct nfs4_mig_recovery_ops *ops =
6311                                         clp->cl_mvops->mig_recovery_ops;
6312         struct nfs4_exception exception = { };
6313         int status;
6314
6315         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6316                 (unsigned long long)server->fsid.major,
6317                 (unsigned long long)server->fsid.minor,
6318                 clp->cl_hostname);
6319         nfs_display_fhandle(NFS_FH(inode), __func__);
6320
6321         do {
6322                 status = ops->get_locations(inode, locations, page, cred);
6323                 if (status != -NFS4ERR_DELAY)
6324                         break;
6325                 nfs4_handle_exception(server, status, &exception);
6326         } while (exception.retry);
6327         return status;
6328 }
6329
6330 /*
6331  * This operation also signals the server that this client is
6332  * performing "lease moved" recovery.  The server can stop
6333  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6334  * is appended to this compound to identify the client ID which is
6335  * performing recovery.
6336  */
6337 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6338 {
6339         struct nfs_server *server = NFS_SERVER(inode);
6340         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6341         struct rpc_clnt *clnt = server->client;
6342         struct nfs4_fsid_present_arg args = {
6343                 .fh             = NFS_FH(inode),
6344                 .clientid       = clp->cl_clientid,
6345                 .renew          = 1,            /* append RENEW */
6346         };
6347         struct nfs4_fsid_present_res res = {
6348                 .renew          = 1,
6349         };
6350         struct rpc_message msg = {
6351                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6352                 .rpc_argp       = &args,
6353                 .rpc_resp       = &res,
6354                 .rpc_cred       = cred,
6355         };
6356         unsigned long now = jiffies;
6357         int status;
6358
6359         res.fh = nfs_alloc_fhandle();
6360         if (res.fh == NULL)
6361                 return -ENOMEM;
6362
6363         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6364         nfs4_set_sequence_privileged(&args.seq_args);
6365         status = nfs4_call_sync_sequence(clnt, server, &msg,
6366                                                 &args.seq_args, &res.seq_res);
6367         nfs_free_fhandle(res.fh);
6368         if (status)
6369                 return status;
6370
6371         do_renew_lease(clp, now);
6372         return 0;
6373 }
6374
6375 #ifdef CONFIG_NFS_V4_1
6376
6377 /*
6378  * This operation also signals the server that this client is
6379  * performing "lease moved" recovery.  The server can stop asserting
6380  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6381  * this operation is identified in the SEQUENCE operation in this
6382  * compound.
6383  */
6384 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6385 {
6386         struct nfs_server *server = NFS_SERVER(inode);
6387         struct rpc_clnt *clnt = server->client;
6388         struct nfs4_fsid_present_arg args = {
6389                 .fh             = NFS_FH(inode),
6390         };
6391         struct nfs4_fsid_present_res res = {
6392         };
6393         struct rpc_message msg = {
6394                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6395                 .rpc_argp       = &args,
6396                 .rpc_resp       = &res,
6397                 .rpc_cred       = cred,
6398         };
6399         int status;
6400
6401         res.fh = nfs_alloc_fhandle();
6402         if (res.fh == NULL)
6403                 return -ENOMEM;
6404
6405         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6406         nfs4_set_sequence_privileged(&args.seq_args);
6407         status = nfs4_call_sync_sequence(clnt, server, &msg,
6408                                                 &args.seq_args, &res.seq_res);
6409         nfs_free_fhandle(res.fh);
6410         if (status == NFS4_OK &&
6411             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6412                 status = -NFS4ERR_LEASE_MOVED;
6413         return status;
6414 }
6415
6416 #endif  /* CONFIG_NFS_V4_1 */
6417
6418 /**
6419  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6420  * @inode: inode on FSID to check
6421  * @cred: credential to use for this operation
6422  *
6423  * Server indicates whether the FSID is present, moved, or not
6424  * recognized.  This operation is necessary to clear a LEASE_MOVED
6425  * condition for this client ID.
6426  *
6427  * Returns NFS4_OK if the FSID is present on this server,
6428  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6429  *  NFS4ERR code if some error occurred on the server, or a
6430  *  negative errno if a local failure occurred.
6431  */
6432 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6433 {
6434         struct nfs_server *server = NFS_SERVER(inode);
6435         struct nfs_client *clp = server->nfs_client;
6436         const struct nfs4_mig_recovery_ops *ops =
6437                                         clp->cl_mvops->mig_recovery_ops;
6438         struct nfs4_exception exception = { };
6439         int status;
6440
6441         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6442                 (unsigned long long)server->fsid.major,
6443                 (unsigned long long)server->fsid.minor,
6444                 clp->cl_hostname);
6445         nfs_display_fhandle(NFS_FH(inode), __func__);
6446
6447         do {
6448                 status = ops->fsid_present(inode, cred);
6449                 if (status != -NFS4ERR_DELAY)
6450                         break;
6451                 nfs4_handle_exception(server, status, &exception);
6452         } while (exception.retry);
6453         return status;
6454 }
6455
6456 /**
6457  * If 'use_integrity' is true and the state managment nfs_client
6458  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6459  * and the machine credential as per RFC3530bis and RFC5661 Security
6460  * Considerations sections. Otherwise, just use the user cred with the
6461  * filesystem's rpc_client.
6462  */
6463 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6464 {
6465         int status;
6466         struct nfs4_secinfo_arg args = {
6467                 .dir_fh = NFS_FH(dir),
6468                 .name   = name,
6469         };
6470         struct nfs4_secinfo_res res = {
6471                 .flavors     = flavors,
6472         };
6473         struct rpc_message msg = {
6474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6475                 .rpc_argp = &args,
6476                 .rpc_resp = &res,
6477         };
6478         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6479         struct rpc_cred *cred = NULL;
6480
6481         if (use_integrity) {
6482                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6483                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6484                 msg.rpc_cred = cred;
6485         }
6486
6487         dprintk("NFS call  secinfo %s\n", name->name);
6488
6489         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6490                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6491
6492         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6493                                 &res.seq_res, 0);
6494         dprintk("NFS reply  secinfo: %d\n", status);
6495
6496         if (cred)
6497                 put_rpccred(cred);
6498
6499         return status;
6500 }
6501
6502 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6503                       struct nfs4_secinfo_flavors *flavors)
6504 {
6505         struct nfs4_exception exception = { };
6506         int err;
6507         do {
6508                 err = -NFS4ERR_WRONGSEC;
6509
6510                 /* try to use integrity protection with machine cred */
6511                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6512                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6513
6514                 /*
6515                  * if unable to use integrity protection, or SECINFO with
6516                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6517                  * disallowed by spec, but exists in deployed servers) use
6518                  * the current filesystem's rpc_client and the user cred.
6519                  */
6520                 if (err == -NFS4ERR_WRONGSEC)
6521                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6522
6523                 trace_nfs4_secinfo(dir, name, err);
6524                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6525                                 &exception);
6526         } while (exception.retry);
6527         return err;
6528 }
6529
6530 #ifdef CONFIG_NFS_V4_1
6531 /*
6532  * Check the exchange flags returned by the server for invalid flags, having
6533  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6534  * DS flags set.
6535  */
6536 static int nfs4_check_cl_exchange_flags(u32 flags)
6537 {
6538         if (flags & ~EXCHGID4_FLAG_MASK_R)
6539                 goto out_inval;
6540         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6541             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6542                 goto out_inval;
6543         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6544                 goto out_inval;
6545         return NFS_OK;
6546 out_inval:
6547         return -NFS4ERR_INVAL;
6548 }
6549
6550 static bool
6551 nfs41_same_server_scope(struct nfs41_server_scope *a,
6552                         struct nfs41_server_scope *b)
6553 {
6554         if (a->server_scope_sz == b->server_scope_sz &&
6555             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6556                 return true;
6557
6558         return false;
6559 }
6560
6561 /*
6562  * nfs4_proc_bind_conn_to_session()
6563  *
6564  * The 4.1 client currently uses the same TCP connection for the
6565  * fore and backchannel.
6566  */
6567 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6568 {
6569         int status;
6570         struct nfs41_bind_conn_to_session_res res;
6571         struct rpc_message msg = {
6572                 .rpc_proc =
6573                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6574                 .rpc_argp = clp,
6575                 .rpc_resp = &res,
6576                 .rpc_cred = cred,
6577         };
6578
6579         dprintk("--> %s\n", __func__);
6580
6581         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6582         if (unlikely(res.session == NULL)) {
6583                 status = -ENOMEM;
6584                 goto out;
6585         }
6586
6587         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6588         trace_nfs4_bind_conn_to_session(clp, status);
6589         if (status == 0) {
6590                 if (memcmp(res.session->sess_id.data,
6591                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6592                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6593                         status = -EIO;
6594                         goto out_session;
6595                 }
6596                 if (res.dir != NFS4_CDFS4_BOTH) {
6597                         dprintk("NFS: %s: Unexpected direction from server\n",
6598                                 __func__);
6599                         status = -EIO;
6600                         goto out_session;
6601                 }
6602                 if (res.use_conn_in_rdma_mode) {
6603                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6604                                 __func__);
6605                         status = -EIO;
6606                         goto out_session;
6607                 }
6608         }
6609 out_session:
6610         kfree(res.session);
6611 out:
6612         dprintk("<-- %s status= %d\n", __func__, status);
6613         return status;
6614 }
6615
6616 /*
6617  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6618  * and operations we'd like to see to enable certain features in the allow map
6619  */
6620 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6621         .how = SP4_MACH_CRED,
6622         .enforce.u.words = {
6623                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6624                       1 << (OP_EXCHANGE_ID - 32) |
6625                       1 << (OP_CREATE_SESSION - 32) |
6626                       1 << (OP_DESTROY_SESSION - 32) |
6627                       1 << (OP_DESTROY_CLIENTID - 32)
6628         },
6629         .allow.u.words = {
6630                 [0] = 1 << (OP_CLOSE) |
6631                       1 << (OP_LOCKU) |
6632                       1 << (OP_COMMIT),
6633                 [1] = 1 << (OP_SECINFO - 32) |
6634                       1 << (OP_SECINFO_NO_NAME - 32) |
6635                       1 << (OP_TEST_STATEID - 32) |
6636                       1 << (OP_FREE_STATEID - 32) |
6637                       1 << (OP_WRITE - 32)
6638         }
6639 };
6640
6641 /*
6642  * Select the state protection mode for client `clp' given the server results
6643  * from exchange_id in `sp'.
6644  *
6645  * Returns 0 on success, negative errno otherwise.
6646  */
6647 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6648                                  struct nfs41_state_protection *sp)
6649 {
6650         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6651                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6652                       1 << (OP_EXCHANGE_ID - 32) |
6653                       1 << (OP_CREATE_SESSION - 32) |
6654                       1 << (OP_DESTROY_SESSION - 32) |
6655                       1 << (OP_DESTROY_CLIENTID - 32)
6656         };
6657         unsigned int i;
6658
6659         if (sp->how == SP4_MACH_CRED) {
6660                 /* Print state protect result */
6661                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6662                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6663                         if (test_bit(i, sp->enforce.u.longs))
6664                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6665                         if (test_bit(i, sp->allow.u.longs))
6666                                 dfprintk(MOUNT, "  allow op %d\n", i);
6667                 }
6668
6669                 /* make sure nothing is on enforce list that isn't supported */
6670                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6671                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6672                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6673                                 return -EINVAL;
6674                         }
6675                 }
6676
6677                 /*
6678                  * Minimal mode - state operations are allowed to use machine
6679                  * credential.  Note this already happens by default, so the
6680                  * client doesn't have to do anything more than the negotiation.
6681                  *
6682                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6683                  *       we're already using the machine cred for exchange_id
6684                  *       and will never use a different cred.
6685                  */
6686                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6687                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6688                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6689                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6690                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6691                         dfprintk(MOUNT, "  minimal mode enabled\n");
6692                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6693                 } else {
6694                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6695                         return -EINVAL;
6696                 }
6697
6698                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6699                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6700                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6701                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6702                 }
6703
6704                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6705                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6706                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6707                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6708                 }
6709
6710                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6711                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6712                         dfprintk(MOUNT, "  stateid mode enabled\n");
6713                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6714                 }
6715
6716                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6717                         dfprintk(MOUNT, "  write mode enabled\n");
6718                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6719                 }
6720
6721                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6722                         dfprintk(MOUNT, "  commit mode enabled\n");
6723                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6724                 }
6725         }
6726
6727         return 0;
6728 }
6729
6730 /*
6731  * _nfs4_proc_exchange_id()
6732  *
6733  * Wrapper for EXCHANGE_ID operation.
6734  */
6735 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6736         u32 sp4_how)
6737 {
6738         nfs4_verifier verifier;
6739         struct nfs41_exchange_id_args args = {
6740                 .verifier = &verifier,
6741                 .client = clp,
6742 #ifdef CONFIG_NFS_V4_1_MIGRATION
6743                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6744                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6745                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6746 #else
6747                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6748                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6749 #endif
6750         };
6751         struct nfs41_exchange_id_res res = {
6752                 0
6753         };
6754         int status;
6755         struct rpc_message msg = {
6756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6757                 .rpc_argp = &args,
6758                 .rpc_resp = &res,
6759                 .rpc_cred = cred,
6760         };
6761
6762         nfs4_init_boot_verifier(clp, &verifier);
6763         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6764                                                         sizeof(args.id));
6765         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6766                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6767                 args.id_len, args.id);
6768
6769         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6770                                         GFP_NOFS);
6771         if (unlikely(res.server_owner == NULL)) {
6772                 status = -ENOMEM;
6773                 goto out;
6774         }
6775
6776         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6777                                         GFP_NOFS);
6778         if (unlikely(res.server_scope == NULL)) {
6779                 status = -ENOMEM;
6780                 goto out_server_owner;
6781         }
6782
6783         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6784         if (unlikely(res.impl_id == NULL)) {
6785                 status = -ENOMEM;
6786                 goto out_server_scope;
6787         }
6788
6789         switch (sp4_how) {
6790         case SP4_NONE:
6791                 args.state_protect.how = SP4_NONE;
6792                 break;
6793
6794         case SP4_MACH_CRED:
6795                 args.state_protect = nfs4_sp4_mach_cred_request;
6796                 break;
6797
6798         default:
6799                 /* unsupported! */
6800                 WARN_ON_ONCE(1);
6801                 status = -EINVAL;
6802                 goto out_server_scope;
6803         }
6804
6805         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6806         trace_nfs4_exchange_id(clp, status);
6807         if (status == 0)
6808                 status = nfs4_check_cl_exchange_flags(res.flags);
6809
6810         if (status == 0)
6811                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6812
6813         if (status == 0) {
6814                 clp->cl_clientid = res.clientid;
6815                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6816                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6817                         clp->cl_seqid = res.seqid;
6818
6819                 kfree(clp->cl_serverowner);
6820                 clp->cl_serverowner = res.server_owner;
6821                 res.server_owner = NULL;
6822
6823                 /* use the most recent implementation id */
6824                 kfree(clp->cl_implid);
6825                 clp->cl_implid = res.impl_id;
6826
6827                 if (clp->cl_serverscope != NULL &&
6828                     !nfs41_same_server_scope(clp->cl_serverscope,
6829                                              res.server_scope)) {
6830                         dprintk("%s: server_scope mismatch detected\n",
6831                                 __func__);
6832                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6833                         kfree(clp->cl_serverscope);
6834                         clp->cl_serverscope = NULL;
6835                 }
6836
6837                 if (clp->cl_serverscope == NULL) {
6838                         clp->cl_serverscope = res.server_scope;
6839                         goto out;
6840                 }
6841         } else
6842                 kfree(res.impl_id);
6843
6844 out_server_owner:
6845         kfree(res.server_owner);
6846 out_server_scope:
6847         kfree(res.server_scope);
6848 out:
6849         if (clp->cl_implid != NULL)
6850                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6851                         "domain: %s, name: %s, date: %llu,%u\n",
6852                         clp->cl_implid->domain, clp->cl_implid->name,
6853                         clp->cl_implid->date.seconds,
6854                         clp->cl_implid->date.nseconds);
6855         dprintk("NFS reply exchange_id: %d\n", status);
6856         return status;
6857 }
6858
6859 /*
6860  * nfs4_proc_exchange_id()
6861  *
6862  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6863  *
6864  * Since the clientid has expired, all compounds using sessions
6865  * associated with the stale clientid will be returning
6866  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6867  * be in some phase of session reset.
6868  *
6869  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6870  */
6871 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6872 {
6873         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6874         int status;
6875
6876         /* try SP4_MACH_CRED if krb5i/p */
6877         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6878             authflavor == RPC_AUTH_GSS_KRB5P) {
6879                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6880                 if (!status)
6881                         return 0;
6882         }
6883
6884         /* try SP4_NONE */
6885         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6886 }
6887
6888 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6889                 struct rpc_cred *cred)
6890 {
6891         struct rpc_message msg = {
6892                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6893                 .rpc_argp = clp,
6894                 .rpc_cred = cred,
6895         };
6896         int status;
6897
6898         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6899         trace_nfs4_destroy_clientid(clp, status);
6900         if (status)
6901                 dprintk("NFS: Got error %d from the server %s on "
6902                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6903         return status;
6904 }
6905
6906 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6907                 struct rpc_cred *cred)
6908 {
6909         unsigned int loop;
6910         int ret;
6911
6912         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6913                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6914                 switch (ret) {
6915                 case -NFS4ERR_DELAY:
6916                 case -NFS4ERR_CLIENTID_BUSY:
6917                         ssleep(1);
6918                         break;
6919                 default:
6920                         return ret;
6921                 }
6922         }
6923         return 0;
6924 }
6925
6926 int nfs4_destroy_clientid(struct nfs_client *clp)
6927 {
6928         struct rpc_cred *cred;
6929         int ret = 0;
6930
6931         if (clp->cl_mvops->minor_version < 1)
6932                 goto out;
6933         if (clp->cl_exchange_flags == 0)
6934                 goto out;
6935         if (clp->cl_preserve_clid)
6936                 goto out;
6937         cred = nfs4_get_clid_cred(clp);
6938         ret = nfs4_proc_destroy_clientid(clp, cred);
6939         if (cred)
6940                 put_rpccred(cred);
6941         switch (ret) {
6942         case 0:
6943         case -NFS4ERR_STALE_CLIENTID:
6944                 clp->cl_exchange_flags = 0;
6945         }
6946 out:
6947         return ret;
6948 }
6949
6950 struct nfs4_get_lease_time_data {
6951         struct nfs4_get_lease_time_args *args;
6952         struct nfs4_get_lease_time_res *res;
6953         struct nfs_client *clp;
6954 };
6955
6956 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6957                                         void *calldata)
6958 {
6959         struct nfs4_get_lease_time_data *data =
6960                         (struct nfs4_get_lease_time_data *)calldata;
6961
6962         dprintk("--> %s\n", __func__);
6963         /* just setup sequence, do not trigger session recovery
6964            since we're invoked within one */
6965         nfs41_setup_sequence(data->clp->cl_session,
6966                         &data->args->la_seq_args,
6967                         &data->res->lr_seq_res,
6968                         task);
6969         dprintk("<-- %s\n", __func__);
6970 }
6971
6972 /*
6973  * Called from nfs4_state_manager thread for session setup, so don't recover
6974  * from sequence operation or clientid errors.
6975  */
6976 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6977 {
6978         struct nfs4_get_lease_time_data *data =
6979                         (struct nfs4_get_lease_time_data *)calldata;
6980
6981         dprintk("--> %s\n", __func__);
6982         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6983                 return;
6984         switch (task->tk_status) {
6985         case -NFS4ERR_DELAY:
6986         case -NFS4ERR_GRACE:
6987                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6988                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6989                 task->tk_status = 0;
6990                 /* fall through */
6991         case -NFS4ERR_RETRY_UNCACHED_REP:
6992                 rpc_restart_call_prepare(task);
6993                 return;
6994         }
6995         dprintk("<-- %s\n", __func__);
6996 }
6997
6998 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6999         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7000         .rpc_call_done = nfs4_get_lease_time_done,
7001 };
7002
7003 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7004 {
7005         struct rpc_task *task;
7006         struct nfs4_get_lease_time_args args;
7007         struct nfs4_get_lease_time_res res = {
7008                 .lr_fsinfo = fsinfo,
7009         };
7010         struct nfs4_get_lease_time_data data = {
7011                 .args = &args,
7012                 .res = &res,
7013                 .clp = clp,
7014         };
7015         struct rpc_message msg = {
7016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7017                 .rpc_argp = &args,
7018                 .rpc_resp = &res,
7019         };
7020         struct rpc_task_setup task_setup = {
7021                 .rpc_client = clp->cl_rpcclient,
7022                 .rpc_message = &msg,
7023                 .callback_ops = &nfs4_get_lease_time_ops,
7024                 .callback_data = &data,
7025                 .flags = RPC_TASK_TIMEOUT,
7026         };
7027         int status;
7028
7029         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7030         nfs4_set_sequence_privileged(&args.la_seq_args);
7031         dprintk("--> %s\n", __func__);
7032         task = rpc_run_task(&task_setup);
7033
7034         if (IS_ERR(task))
7035                 status = PTR_ERR(task);
7036         else {
7037                 status = task->tk_status;
7038                 rpc_put_task(task);
7039         }
7040         dprintk("<-- %s return %d\n", __func__, status);
7041
7042         return status;
7043 }
7044
7045 /*
7046  * Initialize the values to be used by the client in CREATE_SESSION
7047  * If nfs4_init_session set the fore channel request and response sizes,
7048  * use them.
7049  *
7050  * Set the back channel max_resp_sz_cached to zero to force the client to
7051  * always set csa_cachethis to FALSE because the current implementation
7052  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7053  */
7054 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7055 {
7056         unsigned int max_rqst_sz, max_resp_sz;
7057
7058         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7059         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7060
7061         /* Fore channel attributes */
7062         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7063         args->fc_attrs.max_resp_sz = max_resp_sz;
7064         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7065         args->fc_attrs.max_reqs = max_session_slots;
7066
7067         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7068                 "max_ops=%u max_reqs=%u\n",
7069                 __func__,
7070                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7071                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7072
7073         /* Back channel attributes */
7074         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7075         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7076         args->bc_attrs.max_resp_sz_cached = 0;
7077         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7078         args->bc_attrs.max_reqs = 1;
7079
7080         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7081                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7082                 __func__,
7083                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7084                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7085                 args->bc_attrs.max_reqs);
7086 }
7087
7088 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7089 {
7090         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7091         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7092
7093         if (rcvd->max_resp_sz > sent->max_resp_sz)
7094                 return -EINVAL;
7095         /*
7096          * Our requested max_ops is the minimum we need; we're not
7097          * prepared to break up compounds into smaller pieces than that.
7098          * So, no point even trying to continue if the server won't
7099          * cooperate:
7100          */
7101         if (rcvd->max_ops < sent->max_ops)
7102                 return -EINVAL;
7103         if (rcvd->max_reqs == 0)
7104                 return -EINVAL;
7105         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7106                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7107         return 0;
7108 }
7109
7110 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7111 {
7112         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7113         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7114
7115         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7116                 return -EINVAL;
7117         if (rcvd->max_resp_sz < sent->max_resp_sz)
7118                 return -EINVAL;
7119         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7120                 return -EINVAL;
7121         /* These would render the backchannel useless: */
7122         if (rcvd->max_ops != sent->max_ops)
7123                 return -EINVAL;
7124         if (rcvd->max_reqs != sent->max_reqs)
7125                 return -EINVAL;
7126         return 0;
7127 }
7128
7129 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7130                                      struct nfs4_session *session)
7131 {
7132         int ret;
7133
7134         ret = nfs4_verify_fore_channel_attrs(args, session);
7135         if (ret)
7136                 return ret;
7137         return nfs4_verify_back_channel_attrs(args, session);
7138 }
7139
7140 static int _nfs4_proc_create_session(struct nfs_client *clp,
7141                 struct rpc_cred *cred)
7142 {
7143         struct nfs4_session *session = clp->cl_session;
7144         struct nfs41_create_session_args args = {
7145                 .client = clp,
7146                 .cb_program = NFS4_CALLBACK,
7147         };
7148         struct nfs41_create_session_res res = {
7149                 .client = clp,
7150         };
7151         struct rpc_message msg = {
7152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7153                 .rpc_argp = &args,
7154                 .rpc_resp = &res,
7155                 .rpc_cred = cred,
7156         };
7157         int status;
7158
7159         nfs4_init_channel_attrs(&args);
7160         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7161
7162         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7163         trace_nfs4_create_session(clp, status);
7164
7165         if (!status) {
7166                 /* Verify the session's negotiated channel_attrs values */
7167                 status = nfs4_verify_channel_attrs(&args, session);
7168                 /* Increment the clientid slot sequence id */
7169                 clp->cl_seqid++;
7170         }
7171
7172         return status;
7173 }
7174
7175 /*
7176  * Issues a CREATE_SESSION operation to the server.
7177  * It is the responsibility of the caller to verify the session is
7178  * expired before calling this routine.
7179  */
7180 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7181 {
7182         int status;
7183         unsigned *ptr;
7184         struct nfs4_session *session = clp->cl_session;
7185
7186         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7187
7188         status = _nfs4_proc_create_session(clp, cred);
7189         if (status)
7190                 goto out;
7191
7192         /* Init or reset the session slot tables */
7193         status = nfs4_setup_session_slot_tables(session);
7194         dprintk("slot table setup returned %d\n", status);
7195         if (status)
7196                 goto out;
7197
7198         ptr = (unsigned *)&session->sess_id.data[0];
7199         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7200                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7201 out:
7202         dprintk("<-- %s\n", __func__);
7203         return status;
7204 }
7205
7206 /*
7207  * Issue the over-the-wire RPC DESTROY_SESSION.
7208  * The caller must serialize access to this routine.
7209  */
7210 int nfs4_proc_destroy_session(struct nfs4_session *session,
7211                 struct rpc_cred *cred)
7212 {
7213         struct rpc_message msg = {
7214                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7215                 .rpc_argp = session,
7216                 .rpc_cred = cred,
7217         };
7218         int status = 0;
7219
7220         dprintk("--> nfs4_proc_destroy_session\n");
7221
7222         /* session is still being setup */
7223         if (session->clp->cl_cons_state != NFS_CS_READY)
7224                 return status;
7225
7226         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7227         trace_nfs4_destroy_session(session->clp, status);
7228
7229         if (status)
7230                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7231                         "Session has been destroyed regardless...\n", status);
7232
7233         dprintk("<-- nfs4_proc_destroy_session\n");
7234         return status;
7235 }
7236
7237 /*
7238  * Renew the cl_session lease.
7239  */
7240 struct nfs4_sequence_data {
7241         struct nfs_client *clp;
7242         struct nfs4_sequence_args args;
7243         struct nfs4_sequence_res res;
7244 };
7245
7246 static void nfs41_sequence_release(void *data)
7247 {
7248         struct nfs4_sequence_data *calldata = data;
7249         struct nfs_client *clp = calldata->clp;
7250
7251         if (atomic_read(&clp->cl_count) > 1)
7252                 nfs4_schedule_state_renewal(clp);
7253         nfs_put_client(clp);
7254         kfree(calldata);
7255 }
7256
7257 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7258 {
7259         switch(task->tk_status) {
7260         case -NFS4ERR_DELAY:
7261                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7262                 return -EAGAIN;
7263         default:
7264                 nfs4_schedule_lease_recovery(clp);
7265         }
7266         return 0;
7267 }
7268
7269 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7270 {
7271         struct nfs4_sequence_data *calldata = data;
7272         struct nfs_client *clp = calldata->clp;
7273
7274         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7275                 return;
7276
7277         trace_nfs4_sequence(clp, task->tk_status);
7278         if (task->tk_status < 0) {
7279                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7280                 if (atomic_read(&clp->cl_count) == 1)
7281                         goto out;
7282
7283                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7284                         rpc_restart_call_prepare(task);
7285                         return;
7286                 }
7287         }
7288         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7289 out:
7290         dprintk("<-- %s\n", __func__);
7291 }
7292
7293 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7294 {
7295         struct nfs4_sequence_data *calldata = data;
7296         struct nfs_client *clp = calldata->clp;
7297         struct nfs4_sequence_args *args;
7298         struct nfs4_sequence_res *res;
7299
7300         args = task->tk_msg.rpc_argp;
7301         res = task->tk_msg.rpc_resp;
7302
7303         nfs41_setup_sequence(clp->cl_session, args, res, task);
7304 }
7305
7306 static const struct rpc_call_ops nfs41_sequence_ops = {
7307         .rpc_call_done = nfs41_sequence_call_done,
7308         .rpc_call_prepare = nfs41_sequence_prepare,
7309         .rpc_release = nfs41_sequence_release,
7310 };
7311
7312 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7313                 struct rpc_cred *cred,
7314                 bool is_privileged)
7315 {
7316         struct nfs4_sequence_data *calldata;
7317         struct rpc_message msg = {
7318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7319                 .rpc_cred = cred,
7320         };
7321         struct rpc_task_setup task_setup_data = {
7322                 .rpc_client = clp->cl_rpcclient,
7323                 .rpc_message = &msg,
7324                 .callback_ops = &nfs41_sequence_ops,
7325                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7326         };
7327
7328         if (!atomic_inc_not_zero(&clp->cl_count))
7329                 return ERR_PTR(-EIO);
7330         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7331         if (calldata == NULL) {
7332                 nfs_put_client(clp);
7333                 return ERR_PTR(-ENOMEM);
7334         }
7335         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7336         if (is_privileged)
7337                 nfs4_set_sequence_privileged(&calldata->args);
7338         msg.rpc_argp = &calldata->args;
7339         msg.rpc_resp = &calldata->res;
7340         calldata->clp = clp;
7341         task_setup_data.callback_data = calldata;
7342
7343         return rpc_run_task(&task_setup_data);
7344 }
7345
7346 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7347 {
7348         struct rpc_task *task;
7349         int ret = 0;
7350
7351         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7352                 return 0;
7353         task = _nfs41_proc_sequence(clp, cred, false);
7354         if (IS_ERR(task))
7355                 ret = PTR_ERR(task);
7356         else
7357                 rpc_put_task_async(task);
7358         dprintk("<-- %s status=%d\n", __func__, ret);
7359         return ret;
7360 }
7361
7362 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7363 {
7364         struct rpc_task *task;
7365         int ret;
7366
7367         task = _nfs41_proc_sequence(clp, cred, true);
7368         if (IS_ERR(task)) {
7369                 ret = PTR_ERR(task);
7370                 goto out;
7371         }
7372         ret = rpc_wait_for_completion_task(task);
7373         if (!ret) {
7374                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7375
7376                 if (task->tk_status == 0)
7377                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7378                 ret = task->tk_status;
7379         }
7380         rpc_put_task(task);
7381 out:
7382         dprintk("<-- %s status=%d\n", __func__, ret);
7383         return ret;
7384 }
7385
7386 struct nfs4_reclaim_complete_data {
7387         struct nfs_client *clp;
7388         struct nfs41_reclaim_complete_args arg;
7389         struct nfs41_reclaim_complete_res res;
7390 };
7391
7392 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7393 {
7394         struct nfs4_reclaim_complete_data *calldata = data;
7395
7396         nfs41_setup_sequence(calldata->clp->cl_session,
7397                         &calldata->arg.seq_args,
7398                         &calldata->res.seq_res,
7399                         task);
7400 }
7401
7402 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7403 {
7404         switch(task->tk_status) {
7405         case 0:
7406         case -NFS4ERR_COMPLETE_ALREADY:
7407         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7408                 break;
7409         case -NFS4ERR_DELAY:
7410                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7411                 /* fall through */
7412         case -NFS4ERR_RETRY_UNCACHED_REP:
7413                 return -EAGAIN;
7414         default:
7415                 nfs4_schedule_lease_recovery(clp);
7416         }
7417         return 0;
7418 }
7419
7420 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7421 {
7422         struct nfs4_reclaim_complete_data *calldata = data;
7423         struct nfs_client *clp = calldata->clp;
7424         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7425
7426         dprintk("--> %s\n", __func__);
7427         if (!nfs41_sequence_done(task, res))
7428                 return;
7429
7430         trace_nfs4_reclaim_complete(clp, task->tk_status);
7431         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7432                 rpc_restart_call_prepare(task);
7433                 return;
7434         }
7435         dprintk("<-- %s\n", __func__);
7436 }
7437
7438 static void nfs4_free_reclaim_complete_data(void *data)
7439 {
7440         struct nfs4_reclaim_complete_data *calldata = data;
7441
7442         kfree(calldata);
7443 }
7444
7445 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7446         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7447         .rpc_call_done = nfs4_reclaim_complete_done,
7448         .rpc_release = nfs4_free_reclaim_complete_data,
7449 };
7450
7451 /*
7452  * Issue a global reclaim complete.
7453  */
7454 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7455                 struct rpc_cred *cred)
7456 {
7457         struct nfs4_reclaim_complete_data *calldata;
7458         struct rpc_task *task;
7459         struct rpc_message msg = {
7460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7461                 .rpc_cred = cred,
7462         };
7463         struct rpc_task_setup task_setup_data = {
7464                 .rpc_client = clp->cl_rpcclient,
7465                 .rpc_message = &msg,
7466                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7467                 .flags = RPC_TASK_ASYNC,
7468         };
7469         int status = -ENOMEM;
7470
7471         dprintk("--> %s\n", __func__);
7472         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7473         if (calldata == NULL)
7474                 goto out;
7475         calldata->clp = clp;
7476         calldata->arg.one_fs = 0;
7477
7478         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7479         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7480         msg.rpc_argp = &calldata->arg;
7481         msg.rpc_resp = &calldata->res;
7482         task_setup_data.callback_data = calldata;
7483         task = rpc_run_task(&task_setup_data);
7484         if (IS_ERR(task)) {
7485                 status = PTR_ERR(task);
7486                 goto out;
7487         }
7488         status = nfs4_wait_for_completion_rpc_task(task);
7489         if (status == 0)
7490                 status = task->tk_status;
7491         rpc_put_task(task);
7492         return 0;
7493 out:
7494         dprintk("<-- %s status=%d\n", __func__, status);
7495         return status;
7496 }
7497
7498 static void
7499 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7500 {
7501         struct nfs4_layoutget *lgp = calldata;
7502         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7503         struct nfs4_session *session = nfs4_get_session(server);
7504
7505         dprintk("--> %s\n", __func__);
7506         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7507          * right now covering the LAYOUTGET we are about to send.
7508          * However, that is not so catastrophic, and there seems
7509          * to be no way to prevent it completely.
7510          */
7511         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7512                                 &lgp->res.seq_res, task))
7513                 return;
7514         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7515                                           NFS_I(lgp->args.inode)->layout,
7516                                           lgp->args.ctx->state)) {
7517                 rpc_exit(task, NFS4_OK);
7518         }
7519 }
7520
7521 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7522 {
7523         struct nfs4_layoutget *lgp = calldata;
7524         struct inode *inode = lgp->args.inode;
7525         struct nfs_server *server = NFS_SERVER(inode);
7526         struct pnfs_layout_hdr *lo;
7527         struct nfs4_state *state = NULL;
7528         unsigned long timeo, now, giveup;
7529
7530         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7531
7532         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7533                 goto out;
7534
7535         switch (task->tk_status) {
7536         case 0:
7537                 goto out;
7538         /*
7539          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7540          * (or clients) writing to the same RAID stripe
7541          */
7542         case -NFS4ERR_LAYOUTTRYLATER:
7543         /*
7544          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7545          * existing layout before getting a new one).
7546          */
7547         case -NFS4ERR_RECALLCONFLICT:
7548                 timeo = rpc_get_timeout(task->tk_client);
7549                 giveup = lgp->args.timestamp + timeo;
7550                 now = jiffies;
7551                 if (time_after(giveup, now)) {
7552                         unsigned long delay;
7553
7554                         /* Delay for:
7555                          * - Not less then NFS4_POLL_RETRY_MIN.
7556                          * - One last time a jiffie before we give up
7557                          * - exponential backoff (time_now minus start_attempt)
7558                          */
7559                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7560                                     min((giveup - now - 1),
7561                                         now - lgp->args.timestamp));
7562
7563                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7564                                 __func__, delay);
7565                         rpc_delay(task, delay);
7566                         task->tk_status = 0;
7567                         rpc_restart_call_prepare(task);
7568                         goto out; /* Do not call nfs4_async_handle_error() */
7569                 }
7570                 break;
7571         case -NFS4ERR_EXPIRED:
7572         case -NFS4ERR_BAD_STATEID:
7573                 spin_lock(&inode->i_lock);
7574                 lo = NFS_I(inode)->layout;
7575                 if (!lo || list_empty(&lo->plh_segs)) {
7576                         spin_unlock(&inode->i_lock);
7577                         /* If the open stateid was bad, then recover it. */
7578                         state = lgp->args.ctx->state;
7579                 } else {
7580                         LIST_HEAD(head);
7581
7582                         /*
7583                          * Mark the bad layout state as invalid, then retry
7584                          * with the current stateid.
7585                          */
7586                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7587                         spin_unlock(&inode->i_lock);
7588                         pnfs_free_lseg_list(&head);
7589
7590                         task->tk_status = 0;
7591                         rpc_restart_call_prepare(task);
7592                 }
7593         }
7594         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7595                 rpc_restart_call_prepare(task);
7596 out:
7597         dprintk("<-- %s\n", __func__);
7598 }
7599
7600 static size_t max_response_pages(struct nfs_server *server)
7601 {
7602         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7603         return nfs_page_array_len(0, max_resp_sz);
7604 }
7605
7606 static void nfs4_free_pages(struct page **pages, size_t size)
7607 {
7608         int i;
7609
7610         if (!pages)
7611                 return;
7612
7613         for (i = 0; i < size; i++) {
7614                 if (!pages[i])
7615                         break;
7616                 __free_page(pages[i]);
7617         }
7618         kfree(pages);
7619 }
7620
7621 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7622 {
7623         struct page **pages;
7624         int i;
7625
7626         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7627         if (!pages) {
7628                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7629                 return NULL;
7630         }
7631
7632         for (i = 0; i < size; i++) {
7633                 pages[i] = alloc_page(gfp_flags);
7634                 if (!pages[i]) {
7635                         dprintk("%s: failed to allocate page\n", __func__);
7636                         nfs4_free_pages(pages, size);
7637                         return NULL;
7638                 }
7639         }
7640
7641         return pages;
7642 }
7643
7644 static void nfs4_layoutget_release(void *calldata)
7645 {
7646         struct nfs4_layoutget *lgp = calldata;
7647         struct inode *inode = lgp->args.inode;
7648         struct nfs_server *server = NFS_SERVER(inode);
7649         size_t max_pages = max_response_pages(server);
7650
7651         dprintk("--> %s\n", __func__);
7652         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7653         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7654         put_nfs_open_context(lgp->args.ctx);
7655         kfree(calldata);
7656         dprintk("<-- %s\n", __func__);
7657 }
7658
7659 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7660         .rpc_call_prepare = nfs4_layoutget_prepare,
7661         .rpc_call_done = nfs4_layoutget_done,
7662         .rpc_release = nfs4_layoutget_release,
7663 };
7664
7665 struct pnfs_layout_segment *
7666 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7667 {
7668         struct inode *inode = lgp->args.inode;
7669         struct nfs_server *server = NFS_SERVER(inode);
7670         size_t max_pages = max_response_pages(server);
7671         struct rpc_task *task;
7672         struct rpc_message msg = {
7673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7674                 .rpc_argp = &lgp->args,
7675                 .rpc_resp = &lgp->res,
7676                 .rpc_cred = lgp->cred,
7677         };
7678         struct rpc_task_setup task_setup_data = {
7679                 .rpc_client = server->client,
7680                 .rpc_message = &msg,
7681                 .callback_ops = &nfs4_layoutget_call_ops,
7682                 .callback_data = lgp,
7683                 .flags = RPC_TASK_ASYNC,
7684         };
7685         struct pnfs_layout_segment *lseg = NULL;
7686         int status = 0;
7687
7688         dprintk("--> %s\n", __func__);
7689
7690         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7691         if (!lgp->args.layout.pages) {
7692                 nfs4_layoutget_release(lgp);
7693                 return ERR_PTR(-ENOMEM);
7694         }
7695         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7696         lgp->args.timestamp = jiffies;
7697
7698         lgp->res.layoutp = &lgp->args.layout;
7699         lgp->res.seq_res.sr_slot = NULL;
7700         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7701
7702         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7703         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7704
7705         task = rpc_run_task(&task_setup_data);
7706         if (IS_ERR(task))
7707                 return ERR_CAST(task);
7708         status = nfs4_wait_for_completion_rpc_task(task);
7709         if (status == 0)
7710                 status = task->tk_status;
7711         trace_nfs4_layoutget(lgp->args.ctx,
7712                         &lgp->args.range,
7713                         &lgp->res.range,
7714                         status);
7715         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7716         if (status == 0 && lgp->res.layoutp->len)
7717                 lseg = pnfs_layout_process(lgp);
7718         rpc_put_task(task);
7719         dprintk("<-- %s status=%d\n", __func__, status);
7720         if (status)
7721                 return ERR_PTR(status);
7722         return lseg;
7723 }
7724
7725 static void
7726 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7727 {
7728         struct nfs4_layoutreturn *lrp = calldata;
7729
7730         dprintk("--> %s\n", __func__);
7731         nfs41_setup_sequence(lrp->clp->cl_session,
7732                         &lrp->args.seq_args,
7733                         &lrp->res.seq_res,
7734                         task);
7735 }
7736
7737 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7738 {
7739         struct nfs4_layoutreturn *lrp = calldata;
7740         struct nfs_server *server;
7741
7742         dprintk("--> %s\n", __func__);
7743
7744         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7745                 return;
7746
7747         server = NFS_SERVER(lrp->args.inode);
7748         switch (task->tk_status) {
7749         default:
7750                 task->tk_status = 0;
7751         case 0:
7752                 break;
7753         case -NFS4ERR_DELAY:
7754                 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
7755                         break;
7756                 rpc_restart_call_prepare(task);
7757                 return;
7758         }
7759         dprintk("<-- %s\n", __func__);
7760 }
7761
7762 static void nfs4_layoutreturn_release(void *calldata)
7763 {
7764         struct nfs4_layoutreturn *lrp = calldata;
7765         struct pnfs_layout_hdr *lo = lrp->args.layout;
7766
7767         dprintk("--> %s\n", __func__);
7768         spin_lock(&lo->plh_inode->i_lock);
7769         if (lrp->res.lrs_present)
7770                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7771         lo->plh_block_lgets--;
7772         spin_unlock(&lo->plh_inode->i_lock);
7773         pnfs_put_layout_hdr(lrp->args.layout);
7774         kfree(calldata);
7775         dprintk("<-- %s\n", __func__);
7776 }
7777
7778 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7779         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7780         .rpc_call_done = nfs4_layoutreturn_done,
7781         .rpc_release = nfs4_layoutreturn_release,
7782 };
7783
7784 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7785 {
7786         struct rpc_task *task;
7787         struct rpc_message msg = {
7788                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7789                 .rpc_argp = &lrp->args,
7790                 .rpc_resp = &lrp->res,
7791                 .rpc_cred = lrp->cred,
7792         };
7793         struct rpc_task_setup task_setup_data = {
7794                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7795                 .rpc_message = &msg,
7796                 .callback_ops = &nfs4_layoutreturn_call_ops,
7797                 .callback_data = lrp,
7798         };
7799         int status;
7800
7801         dprintk("--> %s\n", __func__);
7802         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7803         task = rpc_run_task(&task_setup_data);
7804         if (IS_ERR(task))
7805                 return PTR_ERR(task);
7806         status = task->tk_status;
7807         trace_nfs4_layoutreturn(lrp->args.inode, status);
7808         dprintk("<-- %s status=%d\n", __func__, status);
7809         rpc_put_task(task);
7810         return status;
7811 }
7812
7813 static int
7814 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7815                 struct pnfs_device *pdev,
7816                 struct rpc_cred *cred)
7817 {
7818         struct nfs4_getdeviceinfo_args args = {
7819                 .pdev = pdev,
7820         };
7821         struct nfs4_getdeviceinfo_res res = {
7822                 .pdev = pdev,
7823         };
7824         struct rpc_message msg = {
7825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7826                 .rpc_argp = &args,
7827                 .rpc_resp = &res,
7828                 .rpc_cred = cred,
7829         };
7830         int status;
7831
7832         dprintk("--> %s\n", __func__);
7833         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7834         dprintk("<-- %s status=%d\n", __func__, status);
7835
7836         return status;
7837 }
7838
7839 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7840                 struct pnfs_device *pdev,
7841                 struct rpc_cred *cred)
7842 {
7843         struct nfs4_exception exception = { };
7844         int err;
7845
7846         do {
7847                 err = nfs4_handle_exception(server,
7848                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7849                                         &exception);
7850         } while (exception.retry);
7851         return err;
7852 }
7853 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7854
7855 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7856 {
7857         struct nfs4_layoutcommit_data *data = calldata;
7858         struct nfs_server *server = NFS_SERVER(data->args.inode);
7859         struct nfs4_session *session = nfs4_get_session(server);
7860
7861         nfs41_setup_sequence(session,
7862                         &data->args.seq_args,
7863                         &data->res.seq_res,
7864                         task);
7865 }
7866
7867 static void
7868 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7869 {
7870         struct nfs4_layoutcommit_data *data = calldata;
7871         struct nfs_server *server = NFS_SERVER(data->args.inode);
7872
7873         if (!nfs41_sequence_done(task, &data->res.seq_res))
7874                 return;
7875
7876         switch (task->tk_status) { /* Just ignore these failures */
7877         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7878         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7879         case -NFS4ERR_BADLAYOUT:     /* no layout */
7880         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7881                 task->tk_status = 0;
7882         case 0:
7883                 break;
7884         default:
7885                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7886                         rpc_restart_call_prepare(task);
7887                         return;
7888                 }
7889         }
7890 }
7891
7892 static void nfs4_layoutcommit_release(void *calldata)
7893 {
7894         struct nfs4_layoutcommit_data *data = calldata;
7895
7896         pnfs_cleanup_layoutcommit(data);
7897         nfs_post_op_update_inode_force_wcc(data->args.inode,
7898                                            data->res.fattr);
7899         put_rpccred(data->cred);
7900         kfree(data);
7901 }
7902
7903 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7904         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7905         .rpc_call_done = nfs4_layoutcommit_done,
7906         .rpc_release = nfs4_layoutcommit_release,
7907 };
7908
7909 int
7910 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7911 {
7912         struct rpc_message msg = {
7913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7914                 .rpc_argp = &data->args,
7915                 .rpc_resp = &data->res,
7916                 .rpc_cred = data->cred,
7917         };
7918         struct rpc_task_setup task_setup_data = {
7919                 .task = &data->task,
7920                 .rpc_client = NFS_CLIENT(data->args.inode),
7921                 .rpc_message = &msg,
7922                 .callback_ops = &nfs4_layoutcommit_ops,
7923                 .callback_data = data,
7924                 .flags = RPC_TASK_ASYNC,
7925         };
7926         struct rpc_task *task;
7927         int status = 0;
7928
7929         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7930                 "lbw: %llu inode %lu\n",
7931                 data->task.tk_pid, sync,
7932                 data->args.lastbytewritten,
7933                 data->args.inode->i_ino);
7934
7935         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7936         task = rpc_run_task(&task_setup_data);
7937         if (IS_ERR(task))
7938                 return PTR_ERR(task);
7939         if (sync == false)
7940                 goto out;
7941         status = nfs4_wait_for_completion_rpc_task(task);
7942         if (status != 0)
7943                 goto out;
7944         status = task->tk_status;
7945         trace_nfs4_layoutcommit(data->args.inode, status);
7946 out:
7947         dprintk("%s: status %d\n", __func__, status);
7948         rpc_put_task(task);
7949         return status;
7950 }
7951
7952 /**
7953  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7954  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7955  */
7956 static int
7957 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7958                     struct nfs_fsinfo *info,
7959                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7960 {
7961         struct nfs41_secinfo_no_name_args args = {
7962                 .style = SECINFO_STYLE_CURRENT_FH,
7963         };
7964         struct nfs4_secinfo_res res = {
7965                 .flavors = flavors,
7966         };
7967         struct rpc_message msg = {
7968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7969                 .rpc_argp = &args,
7970                 .rpc_resp = &res,
7971         };
7972         struct rpc_clnt *clnt = server->client;
7973         struct rpc_cred *cred = NULL;
7974         int status;
7975
7976         if (use_integrity) {
7977                 clnt = server->nfs_client->cl_rpcclient;
7978                 cred = nfs4_get_clid_cred(server->nfs_client);
7979                 msg.rpc_cred = cred;
7980         }
7981
7982         dprintk("--> %s\n", __func__);
7983         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7984                                 &res.seq_res, 0);
7985         dprintk("<-- %s status=%d\n", __func__, status);
7986
7987         if (cred)
7988                 put_rpccred(cred);
7989
7990         return status;
7991 }
7992
7993 static int
7994 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7995                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7996 {
7997         struct nfs4_exception exception = { };
7998         int err;
7999         do {
8000                 /* first try using integrity protection */
8001                 err = -NFS4ERR_WRONGSEC;
8002
8003                 /* try to use integrity protection with machine cred */
8004                 if (_nfs4_is_integrity_protected(server->nfs_client))
8005                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8006                                                           flavors, true);
8007
8008                 /*
8009                  * if unable to use integrity protection, or SECINFO with
8010                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8011                  * disallowed by spec, but exists in deployed servers) use
8012                  * the current filesystem's rpc_client and the user cred.
8013                  */
8014                 if (err == -NFS4ERR_WRONGSEC)
8015                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8016                                                           flavors, false);
8017
8018                 switch (err) {
8019                 case 0:
8020                 case -NFS4ERR_WRONGSEC:
8021                 case -ENOTSUPP:
8022                         goto out;
8023                 default:
8024                         err = nfs4_handle_exception(server, err, &exception);
8025                 }
8026         } while (exception.retry);
8027 out:
8028         return err;
8029 }
8030
8031 static int
8032 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8033                     struct nfs_fsinfo *info)
8034 {
8035         int err;
8036         struct page *page;
8037         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8038         struct nfs4_secinfo_flavors *flavors;
8039         struct nfs4_secinfo4 *secinfo;
8040         int i;
8041
8042         page = alloc_page(GFP_KERNEL);
8043         if (!page) {
8044                 err = -ENOMEM;
8045                 goto out;
8046         }
8047
8048         flavors = page_address(page);
8049         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8050
8051         /*
8052          * Fall back on "guess and check" method if
8053          * the server doesn't support SECINFO_NO_NAME
8054          */
8055         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8056                 err = nfs4_find_root_sec(server, fhandle, info);
8057                 goto out_freepage;
8058         }
8059         if (err)
8060                 goto out_freepage;
8061
8062         for (i = 0; i < flavors->num_flavors; i++) {
8063                 secinfo = &flavors->flavors[i];
8064
8065                 switch (secinfo->flavor) {
8066                 case RPC_AUTH_NULL:
8067                 case RPC_AUTH_UNIX:
8068                 case RPC_AUTH_GSS:
8069                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8070                                         &secinfo->flavor_info);
8071                         break;
8072                 default:
8073                         flavor = RPC_AUTH_MAXFLAVOR;
8074                         break;
8075                 }
8076
8077                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8078                         flavor = RPC_AUTH_MAXFLAVOR;
8079
8080                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8081                         err = nfs4_lookup_root_sec(server, fhandle,
8082                                                    info, flavor);
8083                         if (!err)
8084                                 break;
8085                 }
8086         }
8087
8088         if (flavor == RPC_AUTH_MAXFLAVOR)
8089                 err = -EPERM;
8090
8091 out_freepage:
8092         put_page(page);
8093         if (err == -EACCES)
8094                 return -EPERM;
8095 out:
8096         return err;
8097 }
8098
8099 static int _nfs41_test_stateid(struct nfs_server *server,
8100                 nfs4_stateid *stateid,
8101                 struct rpc_cred *cred)
8102 {
8103         int status;
8104         struct nfs41_test_stateid_args args = {
8105                 .stateid = stateid,
8106         };
8107         struct nfs41_test_stateid_res res;
8108         struct rpc_message msg = {
8109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8110                 .rpc_argp = &args,
8111                 .rpc_resp = &res,
8112                 .rpc_cred = cred,
8113         };
8114         struct rpc_clnt *rpc_client = server->client;
8115
8116         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8117                 &rpc_client, &msg);
8118
8119         dprintk("NFS call  test_stateid %p\n", stateid);
8120         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8121         nfs4_set_sequence_privileged(&args.seq_args);
8122         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8123                         &args.seq_args, &res.seq_res);
8124         if (status != NFS_OK) {
8125                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8126                 return status;
8127         }
8128         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8129         return -res.status;
8130 }
8131
8132 /**
8133  * nfs41_test_stateid - perform a TEST_STATEID operation
8134  *
8135  * @server: server / transport on which to perform the operation
8136  * @stateid: state ID to test
8137  * @cred: credential
8138  *
8139  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8140  * Otherwise a negative NFS4ERR value is returned if the operation
8141  * failed or the state ID is not currently valid.
8142  */
8143 static int nfs41_test_stateid(struct nfs_server *server,
8144                 nfs4_stateid *stateid,
8145                 struct rpc_cred *cred)
8146 {
8147         struct nfs4_exception exception = { };
8148         int err;
8149         do {
8150                 err = _nfs41_test_stateid(server, stateid, cred);
8151                 if (err != -NFS4ERR_DELAY)
8152                         break;
8153                 nfs4_handle_exception(server, err, &exception);
8154         } while (exception.retry);
8155         return err;
8156 }
8157
8158 struct nfs_free_stateid_data {
8159         struct nfs_server *server;
8160         struct nfs41_free_stateid_args args;
8161         struct nfs41_free_stateid_res res;
8162 };
8163
8164 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8165 {
8166         struct nfs_free_stateid_data *data = calldata;
8167         nfs41_setup_sequence(nfs4_get_session(data->server),
8168                         &data->args.seq_args,
8169                         &data->res.seq_res,
8170                         task);
8171 }
8172
8173 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8174 {
8175         struct nfs_free_stateid_data *data = calldata;
8176
8177         nfs41_sequence_done(task, &data->res.seq_res);
8178
8179         switch (task->tk_status) {
8180         case -NFS4ERR_DELAY:
8181                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8182                         rpc_restart_call_prepare(task);
8183         }
8184 }
8185
8186 static void nfs41_free_stateid_release(void *calldata)
8187 {
8188         kfree(calldata);
8189 }
8190
8191 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8192         .rpc_call_prepare = nfs41_free_stateid_prepare,
8193         .rpc_call_done = nfs41_free_stateid_done,
8194         .rpc_release = nfs41_free_stateid_release,
8195 };
8196
8197 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8198                 nfs4_stateid *stateid,
8199                 struct rpc_cred *cred,
8200                 bool privileged)
8201 {
8202         struct rpc_message msg = {
8203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8204                 .rpc_cred = cred,
8205         };
8206         struct rpc_task_setup task_setup = {
8207                 .rpc_client = server->client,
8208                 .rpc_message = &msg,
8209                 .callback_ops = &nfs41_free_stateid_ops,
8210                 .flags = RPC_TASK_ASYNC,
8211         };
8212         struct nfs_free_stateid_data *data;
8213
8214         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8215                 &task_setup.rpc_client, &msg);
8216
8217         dprintk("NFS call  free_stateid %p\n", stateid);
8218         data = kmalloc(sizeof(*data), GFP_NOFS);
8219         if (!data)
8220                 return ERR_PTR(-ENOMEM);
8221         data->server = server;
8222         nfs4_stateid_copy(&data->args.stateid, stateid);
8223
8224         task_setup.callback_data = data;
8225
8226         msg.rpc_argp = &data->args;
8227         msg.rpc_resp = &data->res;
8228         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8229         if (privileged)
8230                 nfs4_set_sequence_privileged(&data->args.seq_args);
8231
8232         return rpc_run_task(&task_setup);
8233 }
8234
8235 /**
8236  * nfs41_free_stateid - perform a FREE_STATEID operation
8237  *
8238  * @server: server / transport on which to perform the operation
8239  * @stateid: state ID to release
8240  * @cred: credential
8241  *
8242  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8243  * negative NFS4ERR value is returned.
8244  */
8245 static int nfs41_free_stateid(struct nfs_server *server,
8246                 nfs4_stateid *stateid,
8247                 struct rpc_cred *cred)
8248 {
8249         struct rpc_task *task;
8250         int ret;
8251
8252         task = _nfs41_free_stateid(server, stateid, cred, true);
8253         if (IS_ERR(task))
8254                 return PTR_ERR(task);
8255         ret = rpc_wait_for_completion_task(task);
8256         if (!ret)
8257                 ret = task->tk_status;
8258         rpc_put_task(task);
8259         return ret;
8260 }
8261
8262 static void
8263 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8264 {
8265         struct rpc_task *task;
8266         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8267
8268         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8269         nfs4_free_lock_state(server, lsp);
8270         if (IS_ERR(task))
8271                 return;
8272         rpc_put_task(task);
8273 }
8274
8275 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8276                 const nfs4_stateid *s2)
8277 {
8278         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8279                 return false;
8280
8281         if (s1->seqid == s2->seqid)
8282                 return true;
8283         if (s1->seqid == 0 || s2->seqid == 0)
8284                 return true;
8285
8286         return false;
8287 }
8288
8289 #endif /* CONFIG_NFS_V4_1 */
8290
8291 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8292                 const nfs4_stateid *s2)
8293 {
8294         return nfs4_stateid_match(s1, s2);
8295 }
8296
8297
8298 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8299         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8300         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8301         .recover_open   = nfs4_open_reclaim,
8302         .recover_lock   = nfs4_lock_reclaim,
8303         .establish_clid = nfs4_init_clientid,
8304         .detect_trunking = nfs40_discover_server_trunking,
8305 };
8306
8307 #if defined(CONFIG_NFS_V4_1)
8308 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8309         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8310         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8311         .recover_open   = nfs4_open_reclaim,
8312         .recover_lock   = nfs4_lock_reclaim,
8313         .establish_clid = nfs41_init_clientid,
8314         .reclaim_complete = nfs41_proc_reclaim_complete,
8315         .detect_trunking = nfs41_discover_server_trunking,
8316 };
8317 #endif /* CONFIG_NFS_V4_1 */
8318
8319 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8320         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8321         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8322         .recover_open   = nfs4_open_expired,
8323         .recover_lock   = nfs4_lock_expired,
8324         .establish_clid = nfs4_init_clientid,
8325 };
8326
8327 #if defined(CONFIG_NFS_V4_1)
8328 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8329         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8330         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8331         .recover_open   = nfs41_open_expired,
8332         .recover_lock   = nfs41_lock_expired,
8333         .establish_clid = nfs41_init_clientid,
8334 };
8335 #endif /* CONFIG_NFS_V4_1 */
8336
8337 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8338         .sched_state_renewal = nfs4_proc_async_renew,
8339         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8340         .renew_lease = nfs4_proc_renew,
8341 };
8342
8343 #if defined(CONFIG_NFS_V4_1)
8344 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8345         .sched_state_renewal = nfs41_proc_async_sequence,
8346         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8347         .renew_lease = nfs4_proc_sequence,
8348 };
8349 #endif
8350
8351 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8352         .get_locations = _nfs40_proc_get_locations,
8353         .fsid_present = _nfs40_proc_fsid_present,
8354 };
8355
8356 #if defined(CONFIG_NFS_V4_1)
8357 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8358         .get_locations = _nfs41_proc_get_locations,
8359         .fsid_present = _nfs41_proc_fsid_present,
8360 };
8361 #endif  /* CONFIG_NFS_V4_1 */
8362
8363 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8364         .minor_version = 0,
8365         .init_caps = NFS_CAP_READDIRPLUS
8366                 | NFS_CAP_ATOMIC_OPEN
8367                 | NFS_CAP_CHANGE_ATTR
8368                 | NFS_CAP_POSIX_LOCK,
8369         .init_client = nfs40_init_client,
8370         .shutdown_client = nfs40_shutdown_client,
8371         .match_stateid = nfs4_match_stateid,
8372         .find_root_sec = nfs4_find_root_sec,
8373         .free_lock_state = nfs4_release_lockowner,
8374         .call_sync_ops = &nfs40_call_sync_ops,
8375         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8376         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8377         .state_renewal_ops = &nfs40_state_renewal_ops,
8378         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8379 };
8380
8381 #if defined(CONFIG_NFS_V4_1)
8382 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8383         .minor_version = 1,
8384         .init_caps = NFS_CAP_READDIRPLUS
8385                 | NFS_CAP_ATOMIC_OPEN
8386                 | NFS_CAP_CHANGE_ATTR
8387                 | NFS_CAP_POSIX_LOCK
8388                 | NFS_CAP_STATEID_NFSV41
8389                 | NFS_CAP_ATOMIC_OPEN_V1,
8390         .init_client = nfs41_init_client,
8391         .shutdown_client = nfs41_shutdown_client,
8392         .match_stateid = nfs41_match_stateid,
8393         .find_root_sec = nfs41_find_root_sec,
8394         .free_lock_state = nfs41_free_lock_state,
8395         .call_sync_ops = &nfs41_call_sync_ops,
8396         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8397         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8398         .state_renewal_ops = &nfs41_state_renewal_ops,
8399         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8400 };
8401 #endif
8402
8403 #if defined(CONFIG_NFS_V4_2)
8404 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8405         .minor_version = 2,
8406         .init_caps = NFS_CAP_READDIRPLUS
8407                 | NFS_CAP_ATOMIC_OPEN
8408                 | NFS_CAP_CHANGE_ATTR
8409                 | NFS_CAP_POSIX_LOCK
8410                 | NFS_CAP_STATEID_NFSV41
8411                 | NFS_CAP_ATOMIC_OPEN_V1,
8412         .init_client = nfs41_init_client,
8413         .shutdown_client = nfs41_shutdown_client,
8414         .match_stateid = nfs41_match_stateid,
8415         .find_root_sec = nfs41_find_root_sec,
8416         .free_lock_state = nfs41_free_lock_state,
8417         .call_sync_ops = &nfs41_call_sync_ops,
8418         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8419         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8420         .state_renewal_ops = &nfs41_state_renewal_ops,
8421 };
8422 #endif
8423
8424 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8425         [0] = &nfs_v4_0_minor_ops,
8426 #if defined(CONFIG_NFS_V4_1)
8427         [1] = &nfs_v4_1_minor_ops,
8428 #endif
8429 #if defined(CONFIG_NFS_V4_2)
8430         [2] = &nfs_v4_2_minor_ops,
8431 #endif
8432 };
8433
8434 static const struct inode_operations nfs4_dir_inode_operations = {
8435         .create         = nfs_create,
8436         .lookup         = nfs_lookup,
8437         .atomic_open    = nfs_atomic_open,
8438         .link           = nfs_link,
8439         .unlink         = nfs_unlink,
8440         .symlink        = nfs_symlink,
8441         .mkdir          = nfs_mkdir,
8442         .rmdir          = nfs_rmdir,
8443         .mknod          = nfs_mknod,
8444         .rename         = nfs_rename,
8445         .permission     = nfs_permission,
8446         .getattr        = nfs_getattr,
8447         .setattr        = nfs_setattr,
8448         .getxattr       = generic_getxattr,
8449         .setxattr       = generic_setxattr,
8450         .listxattr      = generic_listxattr,
8451         .removexattr    = generic_removexattr,
8452 };
8453
8454 static const struct inode_operations nfs4_file_inode_operations = {
8455         .permission     = nfs_permission,
8456         .getattr        = nfs_getattr,
8457         .setattr        = nfs_setattr,
8458         .getxattr       = generic_getxattr,
8459         .setxattr       = generic_setxattr,
8460         .listxattr      = generic_listxattr,
8461         .removexattr    = generic_removexattr,
8462 };
8463
8464 const struct nfs_rpc_ops nfs_v4_clientops = {
8465         .version        = 4,                    /* protocol version */
8466         .dentry_ops     = &nfs4_dentry_operations,
8467         .dir_inode_ops  = &nfs4_dir_inode_operations,
8468         .file_inode_ops = &nfs4_file_inode_operations,
8469         .file_ops       = &nfs4_file_operations,
8470         .getroot        = nfs4_proc_get_root,
8471         .submount       = nfs4_submount,
8472         .try_mount      = nfs4_try_mount,
8473         .getattr        = nfs4_proc_getattr,
8474         .setattr        = nfs4_proc_setattr,
8475         .lookup         = nfs4_proc_lookup,
8476         .access         = nfs4_proc_access,
8477         .readlink       = nfs4_proc_readlink,
8478         .create         = nfs4_proc_create,
8479         .remove         = nfs4_proc_remove,
8480         .unlink_setup   = nfs4_proc_unlink_setup,
8481         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8482         .unlink_done    = nfs4_proc_unlink_done,
8483         .rename_setup   = nfs4_proc_rename_setup,
8484         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8485         .rename_done    = nfs4_proc_rename_done,
8486         .link           = nfs4_proc_link,
8487         .symlink        = nfs4_proc_symlink,
8488         .mkdir          = nfs4_proc_mkdir,
8489         .rmdir          = nfs4_proc_remove,
8490         .readdir        = nfs4_proc_readdir,
8491         .mknod          = nfs4_proc_mknod,
8492         .statfs         = nfs4_proc_statfs,
8493         .fsinfo         = nfs4_proc_fsinfo,
8494         .pathconf       = nfs4_proc_pathconf,
8495         .set_capabilities = nfs4_server_capabilities,
8496         .decode_dirent  = nfs4_decode_dirent,
8497         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8498         .read_setup     = nfs4_proc_read_setup,
8499         .read_done      = nfs4_read_done,
8500         .write_setup    = nfs4_proc_write_setup,
8501         .write_done     = nfs4_write_done,
8502         .commit_setup   = nfs4_proc_commit_setup,
8503         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8504         .commit_done    = nfs4_commit_done,
8505         .lock           = nfs4_proc_lock,
8506         .clear_acl_cache = nfs4_zap_acl_attr,
8507         .close_context  = nfs4_close_context,
8508         .open_context   = nfs4_atomic_open,
8509         .have_delegation = nfs4_have_delegation,
8510         .return_delegation = nfs4_inode_return_delegation,
8511         .alloc_client   = nfs4_alloc_client,
8512         .init_client    = nfs4_init_client,
8513         .free_client    = nfs4_free_client,
8514         .create_server  = nfs4_create_server,
8515         .clone_server   = nfs_clone_server,
8516 };
8517
8518 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8519         .prefix = XATTR_NAME_NFSV4_ACL,
8520         .list   = nfs4_xattr_list_nfs4_acl,
8521         .get    = nfs4_xattr_get_nfs4_acl,
8522         .set    = nfs4_xattr_set_nfs4_acl,
8523 };
8524
8525 const struct xattr_handler *nfs4_xattr_handlers[] = {
8526         &nfs4_xattr_nfs4_acl_handler,
8527 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8528         &nfs4_xattr_nfs4_label_handler,
8529 #endif
8530         NULL
8531 };
8532
8533 /*
8534  * Local variables:
8535  *  c-basic-offset: 8
8536  * End:
8537  */