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                 if (can_open_cached(state, fmode, open_mode)) {
1311                         spin_lock(&state->owner->so_lock);
1312                         if (can_open_cached(state, fmode, open_mode)) {
1313                                 update_open_stateflags(state, fmode);
1314                                 spin_unlock(&state->owner->so_lock);
1315                                 goto out_return_state;
1316                         }
1317                         spin_unlock(&state->owner->so_lock);
1318                 }
1319                 rcu_read_lock();
1320                 delegation = rcu_dereference(nfsi->delegation);
1321                 if (!can_open_delegated(delegation, fmode)) {
1322                         rcu_read_unlock();
1323                         break;
1324                 }
1325                 /* Save the delegation */
1326                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1327                 rcu_read_unlock();
1328                 nfs_release_seqid(opendata->o_arg.seqid);
1329                 if (!opendata->is_recover) {
1330                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1331                         if (ret != 0)
1332                                 goto out;
1333                 }
1334                 ret = -EAGAIN;
1335
1336                 /* Try to update the stateid using the delegation */
1337                 if (update_open_stateid(state, NULL, &stateid, fmode))
1338                         goto out_return_state;
1339         }
1340 out:
1341         return ERR_PTR(ret);
1342 out_return_state:
1343         atomic_inc(&state->count);
1344         return state;
1345 }
1346
1347 static void
1348 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1349 {
1350         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1351         struct nfs_delegation *delegation;
1352         int delegation_flags = 0;
1353
1354         rcu_read_lock();
1355         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1356         if (delegation)
1357                 delegation_flags = delegation->flags;
1358         rcu_read_unlock();
1359         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1360                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1361                                    "returning a delegation for "
1362                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1363                                    clp->cl_hostname);
1364         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1365                 nfs_inode_set_delegation(state->inode,
1366                                          data->owner->so_cred,
1367                                          &data->o_res);
1368         else
1369                 nfs_inode_reclaim_delegation(state->inode,
1370                                              data->owner->so_cred,
1371                                              &data->o_res);
1372 }
1373
1374 /*
1375  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1376  * and update the nfs4_state.
1377  */
1378 static struct nfs4_state *
1379 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1380 {
1381         struct inode *inode = data->state->inode;
1382         struct nfs4_state *state = data->state;
1383         int ret;
1384
1385         if (!data->rpc_done) {
1386                 if (data->rpc_status) {
1387                         ret = data->rpc_status;
1388                         goto err;
1389                 }
1390                 /* cached opens have already been processed */
1391                 goto update;
1392         }
1393
1394         ret = nfs_refresh_inode(inode, &data->f_attr);
1395         if (ret)
1396                 goto err;
1397
1398         if (data->o_res.delegation_type != 0)
1399                 nfs4_opendata_check_deleg(data, state);
1400 update:
1401         update_open_stateid(state, &data->o_res.stateid, NULL,
1402                             data->o_arg.fmode);
1403         atomic_inc(&state->count);
1404
1405         return state;
1406 err:
1407         return ERR_PTR(ret);
1408
1409 }
1410
1411 static struct nfs4_state *
1412 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1413 {
1414         struct inode *inode;
1415         struct nfs4_state *state = NULL;
1416         int ret;
1417
1418         if (!data->rpc_done) {
1419                 state = nfs4_try_open_cached(data);
1420                 goto out;
1421         }
1422
1423         ret = -EAGAIN;
1424         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1425                 goto err;
1426         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1427         ret = PTR_ERR(inode);
1428         if (IS_ERR(inode))
1429                 goto err;
1430         ret = -ENOMEM;
1431         state = nfs4_get_open_state(inode, data->owner);
1432         if (state == NULL)
1433                 goto err_put_inode;
1434         if (data->o_res.delegation_type != 0)
1435                 nfs4_opendata_check_deleg(data, state);
1436         update_open_stateid(state, &data->o_res.stateid, NULL,
1437                         data->o_arg.fmode);
1438         iput(inode);
1439 out:
1440         nfs_release_seqid(data->o_arg.seqid);
1441         return state;
1442 err_put_inode:
1443         iput(inode);
1444 err:
1445         return ERR_PTR(ret);
1446 }
1447
1448 static struct nfs4_state *
1449 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1450 {
1451         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1452                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1453         return _nfs4_opendata_to_nfs4_state(data);
1454 }
1455
1456 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1457 {
1458         struct nfs_inode *nfsi = NFS_I(state->inode);
1459         struct nfs_open_context *ctx;
1460
1461         spin_lock(&state->inode->i_lock);
1462         list_for_each_entry(ctx, &nfsi->open_files, list) {
1463                 if (ctx->state != state)
1464                         continue;
1465                 get_nfs_open_context(ctx);
1466                 spin_unlock(&state->inode->i_lock);
1467                 return ctx;
1468         }
1469         spin_unlock(&state->inode->i_lock);
1470         return ERR_PTR(-ENOENT);
1471 }
1472
1473 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1474                 struct nfs4_state *state, enum open_claim_type4 claim)
1475 {
1476         struct nfs4_opendata *opendata;
1477
1478         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1479                         NULL, NULL, claim, GFP_NOFS);
1480         if (opendata == NULL)
1481                 return ERR_PTR(-ENOMEM);
1482         opendata->state = state;
1483         atomic_inc(&state->count);
1484         return opendata;
1485 }
1486
1487 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1488 {
1489         struct nfs4_state *newstate;
1490         int ret;
1491
1492         opendata->o_arg.open_flags = 0;
1493         opendata->o_arg.fmode = fmode;
1494         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1495         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1496         nfs4_init_opendata_res(opendata);
1497         ret = _nfs4_recover_proc_open(opendata);
1498         if (ret != 0)
1499                 return ret;
1500         newstate = nfs4_opendata_to_nfs4_state(opendata);
1501         if (IS_ERR(newstate))
1502                 return PTR_ERR(newstate);
1503         nfs4_close_state(newstate, fmode);
1504         *res = newstate;
1505         return 0;
1506 }
1507
1508 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1509 {
1510         struct nfs4_state *newstate;
1511         int ret;
1512
1513         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1514         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1515         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1516         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1517         /* memory barrier prior to reading state->n_* */
1518         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1519         clear_bit(NFS_OPEN_STATE, &state->flags);
1520         smp_rmb();
1521         if (state->n_rdwr != 0) {
1522                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1523                 if (ret != 0)
1524                         return ret;
1525                 if (newstate != state)
1526                         return -ESTALE;
1527         }
1528         if (state->n_wronly != 0) {
1529                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1530                 if (ret != 0)
1531                         return ret;
1532                 if (newstate != state)
1533                         return -ESTALE;
1534         }
1535         if (state->n_rdonly != 0) {
1536                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1537                 if (ret != 0)
1538                         return ret;
1539                 if (newstate != state)
1540                         return -ESTALE;
1541         }
1542         /*
1543          * We may have performed cached opens for all three recoveries.
1544          * Check if we need to update the current stateid.
1545          */
1546         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1547             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1548                 write_seqlock(&state->seqlock);
1549                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1550                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1551                 write_sequnlock(&state->seqlock);
1552         }
1553         return 0;
1554 }
1555
1556 /*
1557  * OPEN_RECLAIM:
1558  *      reclaim state on the server after a reboot.
1559  */
1560 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1561 {
1562         struct nfs_delegation *delegation;
1563         struct nfs4_opendata *opendata;
1564         fmode_t delegation_type = 0;
1565         int status;
1566
1567         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1568                         NFS4_OPEN_CLAIM_PREVIOUS);
1569         if (IS_ERR(opendata))
1570                 return PTR_ERR(opendata);
1571         rcu_read_lock();
1572         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1573         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1574                 delegation_type = delegation->type;
1575         rcu_read_unlock();
1576         opendata->o_arg.u.delegation_type = delegation_type;
1577         status = nfs4_open_recover(opendata, state);
1578         nfs4_opendata_put(opendata);
1579         return status;
1580 }
1581
1582 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1583 {
1584         struct nfs_server *server = NFS_SERVER(state->inode);
1585         struct nfs4_exception exception = { };
1586         int err;
1587         do {
1588                 err = _nfs4_do_open_reclaim(ctx, state);
1589                 trace_nfs4_open_reclaim(ctx, 0, err);
1590                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1591                         continue;
1592                 if (err != -NFS4ERR_DELAY)
1593                         break;
1594                 nfs4_handle_exception(server, err, &exception);
1595         } while (exception.retry);
1596         return err;
1597 }
1598
1599 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1600 {
1601         struct nfs_open_context *ctx;
1602         int ret;
1603
1604         ctx = nfs4_state_find_open_context(state);
1605         if (IS_ERR(ctx))
1606                 return -EAGAIN;
1607         ret = nfs4_do_open_reclaim(ctx, state);
1608         put_nfs_open_context(ctx);
1609         return ret;
1610 }
1611
1612 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1613 {
1614         switch (err) {
1615                 default:
1616                         printk(KERN_ERR "NFS: %s: unhandled error "
1617                                         "%d.\n", __func__, err);
1618                 case 0:
1619                 case -ENOENT:
1620                 case -ESTALE:
1621                         break;
1622                 case -NFS4ERR_BADSESSION:
1623                 case -NFS4ERR_BADSLOT:
1624                 case -NFS4ERR_BAD_HIGH_SLOT:
1625                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1626                 case -NFS4ERR_DEADSESSION:
1627                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1628                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1629                         return -EAGAIN;
1630                 case -NFS4ERR_STALE_CLIENTID:
1631                 case -NFS4ERR_STALE_STATEID:
1632                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1633                 case -NFS4ERR_EXPIRED:
1634                         /* Don't recall a delegation if it was lost */
1635                         nfs4_schedule_lease_recovery(server->nfs_client);
1636                         return -EAGAIN;
1637                 case -NFS4ERR_MOVED:
1638                         nfs4_schedule_migration_recovery(server);
1639                         return -EAGAIN;
1640                 case -NFS4ERR_LEASE_MOVED:
1641                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1642                         return -EAGAIN;
1643                 case -NFS4ERR_DELEG_REVOKED:
1644                 case -NFS4ERR_ADMIN_REVOKED:
1645                 case -NFS4ERR_BAD_STATEID:
1646                 case -NFS4ERR_OPENMODE:
1647                         nfs_inode_find_state_and_recover(state->inode,
1648                                         stateid);
1649                         nfs4_schedule_stateid_recovery(server, state);
1650                         return 0;
1651                 case -NFS4ERR_DELAY:
1652                 case -NFS4ERR_GRACE:
1653                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1654                         ssleep(1);
1655                         return -EAGAIN;
1656                 case -ENOMEM:
1657                 case -NFS4ERR_DENIED:
1658                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1659                         return 0;
1660         }
1661         return err;
1662 }
1663
1664 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1665 {
1666         struct nfs_server *server = NFS_SERVER(state->inode);
1667         struct nfs4_opendata *opendata;
1668         int err;
1669
1670         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1671                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1672         if (IS_ERR(opendata))
1673                 return PTR_ERR(opendata);
1674         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1675         err = nfs4_open_recover(opendata, state);
1676         nfs4_opendata_put(opendata);
1677         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1678 }
1679
1680 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1681 {
1682         struct nfs4_opendata *data = calldata;
1683
1684         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1685                                 &data->c_res.seq_res, task);
1686 }
1687
1688 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1689 {
1690         struct nfs4_opendata *data = calldata;
1691
1692         nfs40_sequence_done(task, &data->c_res.seq_res);
1693
1694         data->rpc_status = task->tk_status;
1695         if (data->rpc_status == 0) {
1696                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1697                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1698                 renew_lease(data->o_res.server, data->timestamp);
1699                 data->rpc_done = 1;
1700         }
1701 }
1702
1703 static void nfs4_open_confirm_release(void *calldata)
1704 {
1705         struct nfs4_opendata *data = calldata;
1706         struct nfs4_state *state = NULL;
1707
1708         /* If this request hasn't been cancelled, do nothing */
1709         if (data->cancelled == 0)
1710                 goto out_free;
1711         /* In case of error, no cleanup! */
1712         if (!data->rpc_done)
1713                 goto out_free;
1714         state = nfs4_opendata_to_nfs4_state(data);
1715         if (!IS_ERR(state))
1716                 nfs4_close_state(state, data->o_arg.fmode);
1717 out_free:
1718         nfs4_opendata_put(data);
1719 }
1720
1721 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1722         .rpc_call_prepare = nfs4_open_confirm_prepare,
1723         .rpc_call_done = nfs4_open_confirm_done,
1724         .rpc_release = nfs4_open_confirm_release,
1725 };
1726
1727 /*
1728  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1729  */
1730 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1731 {
1732         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1733         struct rpc_task *task;
1734         struct  rpc_message msg = {
1735                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1736                 .rpc_argp = &data->c_arg,
1737                 .rpc_resp = &data->c_res,
1738                 .rpc_cred = data->owner->so_cred,
1739         };
1740         struct rpc_task_setup task_setup_data = {
1741                 .rpc_client = server->client,
1742                 .rpc_message = &msg,
1743                 .callback_ops = &nfs4_open_confirm_ops,
1744                 .callback_data = data,
1745                 .workqueue = nfsiod_workqueue,
1746                 .flags = RPC_TASK_ASYNC,
1747         };
1748         int status;
1749
1750         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1751         kref_get(&data->kref);
1752         data->rpc_done = 0;
1753         data->rpc_status = 0;
1754         data->timestamp = jiffies;
1755         task = rpc_run_task(&task_setup_data);
1756         if (IS_ERR(task))
1757                 return PTR_ERR(task);
1758         status = nfs4_wait_for_completion_rpc_task(task);
1759         if (status != 0) {
1760                 data->cancelled = 1;
1761                 smp_wmb();
1762         } else
1763                 status = data->rpc_status;
1764         rpc_put_task(task);
1765         return status;
1766 }
1767
1768 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1769 {
1770         struct nfs4_opendata *data = calldata;
1771         struct nfs4_state_owner *sp = data->owner;
1772         struct nfs_client *clp = sp->so_server->nfs_client;
1773
1774         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1775                 goto out_wait;
1776         /*
1777          * Check if we still need to send an OPEN call, or if we can use
1778          * a delegation instead.
1779          */
1780         if (data->state != NULL) {
1781                 struct nfs_delegation *delegation;
1782
1783                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1784                         goto out_no_action;
1785                 rcu_read_lock();
1786                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1787                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1788                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1789                     can_open_delegated(delegation, data->o_arg.fmode))
1790                         goto unlock_no_action;
1791                 rcu_read_unlock();
1792         }
1793         /* Update client id. */
1794         data->o_arg.clientid = clp->cl_clientid;
1795         switch (data->o_arg.claim) {
1796         case NFS4_OPEN_CLAIM_PREVIOUS:
1797         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1798         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1799                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1800         case NFS4_OPEN_CLAIM_FH:
1801                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1802                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1803         }
1804         data->timestamp = jiffies;
1805         if (nfs4_setup_sequence(data->o_arg.server,
1806                                 &data->o_arg.seq_args,
1807                                 &data->o_res.seq_res,
1808                                 task) != 0)
1809                 nfs_release_seqid(data->o_arg.seqid);
1810
1811         /* Set the create mode (note dependency on the session type) */
1812         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1813         if (data->o_arg.open_flags & O_EXCL) {
1814                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1815                 if (nfs4_has_persistent_session(clp))
1816                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1817                 else if (clp->cl_mvops->minor_version > 0)
1818                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1819         }
1820         return;
1821 unlock_no_action:
1822         rcu_read_unlock();
1823 out_no_action:
1824         task->tk_action = NULL;
1825 out_wait:
1826         nfs4_sequence_done(task, &data->o_res.seq_res);
1827 }
1828
1829 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1830 {
1831         struct nfs4_opendata *data = calldata;
1832
1833         data->rpc_status = task->tk_status;
1834
1835         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1836                 return;
1837
1838         if (task->tk_status == 0) {
1839                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1840                         switch (data->o_res.f_attr->mode & S_IFMT) {
1841                         case S_IFREG:
1842                                 break;
1843                         case S_IFLNK:
1844                                 data->rpc_status = -ELOOP;
1845                                 break;
1846                         case S_IFDIR:
1847                                 data->rpc_status = -EISDIR;
1848                                 break;
1849                         default:
1850                                 data->rpc_status = -ENOTDIR;
1851                         }
1852                 }
1853                 renew_lease(data->o_res.server, data->timestamp);
1854                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1855                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1856         }
1857         data->rpc_done = 1;
1858 }
1859
1860 static void nfs4_open_release(void *calldata)
1861 {
1862         struct nfs4_opendata *data = calldata;
1863         struct nfs4_state *state = NULL;
1864
1865         /* If this request hasn't been cancelled, do nothing */
1866         if (data->cancelled == 0)
1867                 goto out_free;
1868         /* In case of error, no cleanup! */
1869         if (data->rpc_status != 0 || !data->rpc_done)
1870                 goto out_free;
1871         /* In case we need an open_confirm, no cleanup! */
1872         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1873                 goto out_free;
1874         state = nfs4_opendata_to_nfs4_state(data);
1875         if (!IS_ERR(state))
1876                 nfs4_close_state(state, data->o_arg.fmode);
1877 out_free:
1878         nfs4_opendata_put(data);
1879 }
1880
1881 static const struct rpc_call_ops nfs4_open_ops = {
1882         .rpc_call_prepare = nfs4_open_prepare,
1883         .rpc_call_done = nfs4_open_done,
1884         .rpc_release = nfs4_open_release,
1885 };
1886
1887 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1888 {
1889         struct inode *dir = data->dir->d_inode;
1890         struct nfs_server *server = NFS_SERVER(dir);
1891         struct nfs_openargs *o_arg = &data->o_arg;
1892         struct nfs_openres *o_res = &data->o_res;
1893         struct rpc_task *task;
1894         struct rpc_message msg = {
1895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1896                 .rpc_argp = o_arg,
1897                 .rpc_resp = o_res,
1898                 .rpc_cred = data->owner->so_cred,
1899         };
1900         struct rpc_task_setup task_setup_data = {
1901                 .rpc_client = server->client,
1902                 .rpc_message = &msg,
1903                 .callback_ops = &nfs4_open_ops,
1904                 .callback_data = data,
1905                 .workqueue = nfsiod_workqueue,
1906                 .flags = RPC_TASK_ASYNC,
1907         };
1908         int status;
1909
1910         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1911         kref_get(&data->kref);
1912         data->rpc_done = 0;
1913         data->rpc_status = 0;
1914         data->cancelled = 0;
1915         data->is_recover = 0;
1916         if (isrecover) {
1917                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1918                 data->is_recover = 1;
1919         }
1920         task = rpc_run_task(&task_setup_data);
1921         if (IS_ERR(task))
1922                 return PTR_ERR(task);
1923         status = nfs4_wait_for_completion_rpc_task(task);
1924         if (status != 0) {
1925                 data->cancelled = 1;
1926                 smp_wmb();
1927         } else
1928                 status = data->rpc_status;
1929         rpc_put_task(task);
1930
1931         return status;
1932 }
1933
1934 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1935 {
1936         struct inode *dir = data->dir->d_inode;
1937         struct nfs_openres *o_res = &data->o_res;
1938         int status;
1939
1940         status = nfs4_run_open_task(data, 1);
1941         if (status != 0 || !data->rpc_done)
1942                 return status;
1943
1944         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1945
1946         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1947                 status = _nfs4_proc_open_confirm(data);
1948                 if (status != 0)
1949                         return status;
1950         }
1951
1952         return status;
1953 }
1954
1955 static int nfs4_opendata_access(struct rpc_cred *cred,
1956                                 struct nfs4_opendata *opendata,
1957                                 struct nfs4_state *state, fmode_t fmode,
1958                                 int openflags)
1959 {
1960         struct nfs_access_entry cache;
1961         u32 mask;
1962
1963         /* access call failed or for some reason the server doesn't
1964          * support any access modes -- defer access call until later */
1965         if (opendata->o_res.access_supported == 0)
1966                 return 0;
1967
1968         mask = 0;
1969         /* don't check MAY_WRITE - a newly created file may not have
1970          * write mode bits, but POSIX allows the creating process to write.
1971          * use openflags to check for exec, because fmode won't
1972          * always have FMODE_EXEC set when file open for exec. */
1973         if (openflags & __FMODE_EXEC) {
1974                 /* ONLY check for exec rights */
1975                 mask = MAY_EXEC;
1976         } else if (fmode & FMODE_READ)
1977                 mask = MAY_READ;
1978
1979         cache.cred = cred;
1980         cache.jiffies = jiffies;
1981         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1982         nfs_access_add_cache(state->inode, &cache);
1983
1984         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1985                 return 0;
1986
1987         /* even though OPEN succeeded, access is denied. Close the file */
1988         nfs4_close_state(state, fmode);
1989         return -EACCES;
1990 }
1991
1992 /*
1993  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1994  */
1995 static int _nfs4_proc_open(struct nfs4_opendata *data)
1996 {
1997         struct inode *dir = data->dir->d_inode;
1998         struct nfs_server *server = NFS_SERVER(dir);
1999         struct nfs_openargs *o_arg = &data->o_arg;
2000         struct nfs_openres *o_res = &data->o_res;
2001         int status;
2002
2003         status = nfs4_run_open_task(data, 0);
2004         if (!data->rpc_done)
2005                 return status;
2006         if (status != 0) {
2007                 if (status == -NFS4ERR_BADNAME &&
2008                                 !(o_arg->open_flags & O_CREAT))
2009                         return -ENOENT;
2010                 return status;
2011         }
2012
2013         nfs_fattr_map_and_free_names(server, &data->f_attr);
2014
2015         if (o_arg->open_flags & O_CREAT) {
2016                 update_changeattr(dir, &o_res->cinfo);
2017                 if (o_arg->open_flags & O_EXCL)
2018                         data->file_created = 1;
2019                 else if (o_res->cinfo.before != o_res->cinfo.after)
2020                         data->file_created = 1;
2021         }
2022         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2023                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2024         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2025                 status = _nfs4_proc_open_confirm(data);
2026                 if (status != 0)
2027                         return status;
2028         }
2029         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2030                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2031         return 0;
2032 }
2033
2034 static int nfs4_recover_expired_lease(struct nfs_server *server)
2035 {
2036         return nfs4_client_recover_expired_lease(server->nfs_client);
2037 }
2038
2039 /*
2040  * OPEN_EXPIRED:
2041  *      reclaim state on the server after a network partition.
2042  *      Assumes caller holds the appropriate lock
2043  */
2044 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2045 {
2046         struct nfs4_opendata *opendata;
2047         int ret;
2048
2049         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2050                         NFS4_OPEN_CLAIM_FH);
2051         if (IS_ERR(opendata))
2052                 return PTR_ERR(opendata);
2053         ret = nfs4_open_recover(opendata, state);
2054         if (ret == -ESTALE)
2055                 d_drop(ctx->dentry);
2056         nfs4_opendata_put(opendata);
2057         return ret;
2058 }
2059
2060 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2061 {
2062         struct nfs_server *server = NFS_SERVER(state->inode);
2063         struct nfs4_exception exception = { };
2064         int err;
2065
2066         do {
2067                 err = _nfs4_open_expired(ctx, state);
2068                 trace_nfs4_open_expired(ctx, 0, err);
2069                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2070                         continue;
2071                 switch (err) {
2072                 default:
2073                         goto out;
2074                 case -NFS4ERR_GRACE:
2075                 case -NFS4ERR_DELAY:
2076                         nfs4_handle_exception(server, err, &exception);
2077                         err = 0;
2078                 }
2079         } while (exception.retry);
2080 out:
2081         return err;
2082 }
2083
2084 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2085 {
2086         struct nfs_open_context *ctx;
2087         int ret;
2088
2089         ctx = nfs4_state_find_open_context(state);
2090         if (IS_ERR(ctx))
2091                 return -EAGAIN;
2092         ret = nfs4_do_open_expired(ctx, state);
2093         put_nfs_open_context(ctx);
2094         return ret;
2095 }
2096
2097 #if defined(CONFIG_NFS_V4_1)
2098 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2099 {
2100         struct nfs_server *server = NFS_SERVER(state->inode);
2101         nfs4_stateid *stateid = &state->stateid;
2102         struct nfs_delegation *delegation;
2103         struct rpc_cred *cred = NULL;
2104         int status = -NFS4ERR_BAD_STATEID;
2105
2106         /* If a state reset has been done, test_stateid is unneeded */
2107         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2108                 return;
2109
2110         /* Get the delegation credential for use by test/free_stateid */
2111         rcu_read_lock();
2112         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2113         if (delegation != NULL &&
2114             nfs4_stateid_match(&delegation->stateid, stateid)) {
2115                 cred = get_rpccred(delegation->cred);
2116                 rcu_read_unlock();
2117                 status = nfs41_test_stateid(server, stateid, cred);
2118                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2119         } else
2120                 rcu_read_unlock();
2121
2122         if (status != NFS_OK) {
2123                 /* Free the stateid unless the server explicitly
2124                  * informs us the stateid is unrecognized. */
2125                 if (status != -NFS4ERR_BAD_STATEID)
2126                         nfs41_free_stateid(server, stateid, cred);
2127                 nfs_remove_bad_delegation(state->inode);
2128
2129                 write_seqlock(&state->seqlock);
2130                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2131                 write_sequnlock(&state->seqlock);
2132                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2133         }
2134
2135         if (cred != NULL)
2136                 put_rpccred(cred);
2137 }
2138
2139 /**
2140  * nfs41_check_open_stateid - possibly free an open stateid
2141  *
2142  * @state: NFSv4 state for an inode
2143  *
2144  * Returns NFS_OK if recovery for this stateid is now finished.
2145  * Otherwise a negative NFS4ERR value is returned.
2146  */
2147 static int nfs41_check_open_stateid(struct nfs4_state *state)
2148 {
2149         struct nfs_server *server = NFS_SERVER(state->inode);
2150         nfs4_stateid *stateid = &state->open_stateid;
2151         struct rpc_cred *cred = state->owner->so_cred;
2152         int status;
2153
2154         /* If a state reset has been done, test_stateid is unneeded */
2155         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2156             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2157             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2158                 return -NFS4ERR_BAD_STATEID;
2159
2160         status = nfs41_test_stateid(server, stateid, cred);
2161         trace_nfs4_test_open_stateid(state, NULL, status);
2162         if (status != NFS_OK) {
2163                 /* Free the stateid unless the server explicitly
2164                  * informs us the stateid is unrecognized. */
2165                 if (status != -NFS4ERR_BAD_STATEID)
2166                         nfs41_free_stateid(server, stateid, cred);
2167
2168                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2169                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2170                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2171                 clear_bit(NFS_OPEN_STATE, &state->flags);
2172         }
2173         return status;
2174 }
2175
2176 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2177 {
2178         int status;
2179
2180         nfs41_clear_delegation_stateid(state);
2181         status = nfs41_check_open_stateid(state);
2182         if (status != NFS_OK)
2183                 status = nfs4_open_expired(sp, state);
2184         return status;
2185 }
2186 #endif
2187
2188 /*
2189  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2190  * fields corresponding to attributes that were used to store the verifier.
2191  * Make sure we clobber those fields in the later setattr call
2192  */
2193 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2194 {
2195         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2196             !(sattr->ia_valid & ATTR_ATIME_SET))
2197                 sattr->ia_valid |= ATTR_ATIME;
2198
2199         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2200             !(sattr->ia_valid & ATTR_MTIME_SET))
2201                 sattr->ia_valid |= ATTR_MTIME;
2202 }
2203
2204 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2205                 fmode_t fmode,
2206                 int flags,
2207                 struct nfs_open_context *ctx)
2208 {
2209         struct nfs4_state_owner *sp = opendata->owner;
2210         struct nfs_server *server = sp->so_server;
2211         struct dentry *dentry;
2212         struct nfs4_state *state;
2213         unsigned int seq;
2214         int ret;
2215
2216         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2217
2218         ret = _nfs4_proc_open(opendata);
2219         if (ret != 0)
2220                 goto out;
2221
2222         state = nfs4_opendata_to_nfs4_state(opendata);
2223         ret = PTR_ERR(state);
2224         if (IS_ERR(state))
2225                 goto out;
2226         if (server->caps & NFS_CAP_POSIX_LOCK)
2227                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2228
2229         dentry = opendata->dentry;
2230         if (dentry->d_inode == NULL) {
2231                 /* FIXME: Is this d_drop() ever needed? */
2232                 d_drop(dentry);
2233                 dentry = d_add_unique(dentry, igrab(state->inode));
2234                 if (dentry == NULL) {
2235                         dentry = opendata->dentry;
2236                 } else if (dentry != ctx->dentry) {
2237                         dput(ctx->dentry);
2238                         ctx->dentry = dget(dentry);
2239                 }
2240                 nfs_set_verifier(dentry,
2241                                 nfs_save_change_attribute(opendata->dir->d_inode));
2242         }
2243
2244         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2245         if (ret != 0)
2246                 goto out;
2247
2248         ctx->state = state;
2249         if (dentry->d_inode == state->inode) {
2250                 nfs_inode_attach_open_context(ctx);
2251                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2252                         nfs4_schedule_stateid_recovery(server, state);
2253         }
2254 out:
2255         return ret;
2256 }
2257
2258 /*
2259  * Returns a referenced nfs4_state
2260  */
2261 static int _nfs4_do_open(struct inode *dir,
2262                         struct nfs_open_context *ctx,
2263                         int flags,
2264                         struct iattr *sattr,
2265                         struct nfs4_label *label,
2266                         int *opened)
2267 {
2268         struct nfs4_state_owner  *sp;
2269         struct nfs4_state     *state = NULL;
2270         struct nfs_server       *server = NFS_SERVER(dir);
2271         struct nfs4_opendata *opendata;
2272         struct dentry *dentry = ctx->dentry;
2273         struct rpc_cred *cred = ctx->cred;
2274         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2275         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2276         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2277         struct nfs4_label *olabel = NULL;
2278         int status;
2279
2280         /* Protect against reboot recovery conflicts */
2281         status = -ENOMEM;
2282         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2283         if (sp == NULL) {
2284                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2285                 goto out_err;
2286         }
2287         status = nfs4_recover_expired_lease(server);
2288         if (status != 0)
2289                 goto err_put_state_owner;
2290         if (dentry->d_inode != NULL)
2291                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2292         status = -ENOMEM;
2293         if (dentry->d_inode)
2294                 claim = NFS4_OPEN_CLAIM_FH;
2295         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2296                         label, claim, GFP_KERNEL);
2297         if (opendata == NULL)
2298                 goto err_put_state_owner;
2299
2300         if (label) {
2301                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2302                 if (IS_ERR(olabel)) {
2303                         status = PTR_ERR(olabel);
2304                         goto err_opendata_put;
2305                 }
2306         }
2307
2308         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2309                 if (!opendata->f_attr.mdsthreshold) {
2310                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2311                         if (!opendata->f_attr.mdsthreshold)
2312                                 goto err_free_label;
2313                 }
2314                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2315         }
2316         if (dentry->d_inode != NULL)
2317                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2318
2319         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2320         if (status != 0)
2321                 goto err_free_label;
2322         state = ctx->state;
2323
2324         if ((opendata->o_arg.open_flags & O_EXCL) &&
2325             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2326                 nfs4_exclusive_attrset(opendata, sattr);
2327
2328                 nfs_fattr_init(opendata->o_res.f_attr);
2329                 status = nfs4_do_setattr(state->inode, cred,
2330                                 opendata->o_res.f_attr, sattr,
2331                                 state, label, olabel);
2332                 if (status == 0) {
2333                         nfs_setattr_update_inode(state->inode, sattr);
2334                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2335                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2336                 }
2337         }
2338         if (opendata->file_created)
2339                 *opened |= FILE_CREATED;
2340
2341         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2342                 *ctx_th = opendata->f_attr.mdsthreshold;
2343                 opendata->f_attr.mdsthreshold = NULL;
2344         }
2345
2346         nfs4_label_free(olabel);
2347
2348         nfs4_opendata_put(opendata);
2349         nfs4_put_state_owner(sp);
2350         return 0;
2351 err_free_label:
2352         nfs4_label_free(olabel);
2353 err_opendata_put:
2354         nfs4_opendata_put(opendata);
2355 err_put_state_owner:
2356         nfs4_put_state_owner(sp);
2357 out_err:
2358         return status;
2359 }
2360
2361
2362 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2363                                         struct nfs_open_context *ctx,
2364                                         int flags,
2365                                         struct iattr *sattr,
2366                                         struct nfs4_label *label,
2367                                         int *opened)
2368 {
2369         struct nfs_server *server = NFS_SERVER(dir);
2370         struct nfs4_exception exception = { };
2371         struct nfs4_state *res;
2372         int status;
2373
2374         do {
2375                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2376                 res = ctx->state;
2377                 trace_nfs4_open_file(ctx, flags, status);
2378                 if (status == 0)
2379                         break;
2380                 /* NOTE: BAD_SEQID means the server and client disagree about the
2381                  * book-keeping w.r.t. state-changing operations
2382                  * (OPEN/CLOSE/LOCK/LOCKU...)
2383                  * It is actually a sign of a bug on the client or on the server.
2384                  *
2385                  * If we receive a BAD_SEQID error in the particular case of
2386                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2387                  * have unhashed the old state_owner for us, and that we can
2388                  * therefore safely retry using a new one. We should still warn
2389                  * the user though...
2390                  */
2391                 if (status == -NFS4ERR_BAD_SEQID) {
2392                         pr_warn_ratelimited("NFS: v4 server %s "
2393                                         " returned a bad sequence-id error!\n",
2394                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2395                         exception.retry = 1;
2396                         continue;
2397                 }
2398                 /*
2399                  * BAD_STATEID on OPEN means that the server cancelled our
2400                  * state before it received the OPEN_CONFIRM.
2401                  * Recover by retrying the request as per the discussion
2402                  * on Page 181 of RFC3530.
2403                  */
2404                 if (status == -NFS4ERR_BAD_STATEID) {
2405                         exception.retry = 1;
2406                         continue;
2407                 }
2408                 if (status == -EAGAIN) {
2409                         /* We must have found a delegation */
2410                         exception.retry = 1;
2411                         continue;
2412                 }
2413                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2414                         continue;
2415                 res = ERR_PTR(nfs4_handle_exception(server,
2416                                         status, &exception));
2417         } while (exception.retry);
2418         return res;
2419 }
2420
2421 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2422                             struct nfs_fattr *fattr, struct iattr *sattr,
2423                             struct nfs4_state *state, struct nfs4_label *ilabel,
2424                             struct nfs4_label *olabel)
2425 {
2426         struct nfs_server *server = NFS_SERVER(inode);
2427         struct nfs_setattrargs  arg = {
2428                 .fh             = NFS_FH(inode),
2429                 .iap            = sattr,
2430                 .server         = server,
2431                 .bitmask = server->attr_bitmask,
2432                 .label          = ilabel,
2433         };
2434         struct nfs_setattrres  res = {
2435                 .fattr          = fattr,
2436                 .label          = olabel,
2437                 .server         = server,
2438         };
2439         struct rpc_message msg = {
2440                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2441                 .rpc_argp       = &arg,
2442                 .rpc_resp       = &res,
2443                 .rpc_cred       = cred,
2444         };
2445         unsigned long timestamp = jiffies;
2446         fmode_t fmode;
2447         bool truncate;
2448         int status;
2449
2450         arg.bitmask = nfs4_bitmask(server, ilabel);
2451         if (ilabel)
2452                 arg.bitmask = nfs4_bitmask(server, olabel);
2453
2454         nfs_fattr_init(fattr);
2455
2456         /* Servers should only apply open mode checks for file size changes */
2457         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2458         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2459
2460         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2461                 /* Use that stateid */
2462         } else if (truncate && state != NULL) {
2463                 struct nfs_lockowner lockowner = {
2464                         .l_owner = current->files,
2465                         .l_pid = current->tgid,
2466                 };
2467                 if (!nfs4_valid_open_stateid(state))
2468                         return -EBADF;
2469                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2470                                 &lockowner) == -EIO)
2471                         return -EBADF;
2472         } else
2473                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2474
2475         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2476         if (status == 0 && state != NULL)
2477                 renew_lease(server, timestamp);
2478         return status;
2479 }
2480
2481 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2482                            struct nfs_fattr *fattr, struct iattr *sattr,
2483                            struct nfs4_state *state, struct nfs4_label *ilabel,
2484                            struct nfs4_label *olabel)
2485 {
2486         struct nfs_server *server = NFS_SERVER(inode);
2487         struct nfs4_exception exception = {
2488                 .state = state,
2489                 .inode = inode,
2490         };
2491         int err;
2492         do {
2493                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2494                 trace_nfs4_setattr(inode, err);
2495                 switch (err) {
2496                 case -NFS4ERR_OPENMODE:
2497                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2498                                 pr_warn_once("NFSv4: server %s is incorrectly "
2499                                                 "applying open mode checks to "
2500                                                 "a SETATTR that is not "
2501                                                 "changing file size.\n",
2502                                                 server->nfs_client->cl_hostname);
2503                         }
2504                         if (state && !(state->state & FMODE_WRITE)) {
2505                                 err = -EBADF;
2506                                 if (sattr->ia_valid & ATTR_OPEN)
2507                                         err = -EACCES;
2508                                 goto out;
2509                         }
2510                 }
2511                 err = nfs4_handle_exception(server, err, &exception);
2512         } while (exception.retry);
2513 out:
2514         return err;
2515 }
2516
2517 struct nfs4_closedata {
2518         struct inode *inode;
2519         struct nfs4_state *state;
2520         struct nfs_closeargs arg;
2521         struct nfs_closeres res;
2522         struct nfs_fattr fattr;
2523         unsigned long timestamp;
2524         bool roc;
2525         u32 roc_barrier;
2526 };
2527
2528 static void nfs4_free_closedata(void *data)
2529 {
2530         struct nfs4_closedata *calldata = data;
2531         struct nfs4_state_owner *sp = calldata->state->owner;
2532         struct super_block *sb = calldata->state->inode->i_sb;
2533
2534         if (calldata->roc)
2535                 pnfs_roc_release(calldata->state->inode);
2536         nfs4_put_open_state(calldata->state);
2537         nfs_free_seqid(calldata->arg.seqid);
2538         nfs4_put_state_owner(sp);
2539         nfs_sb_deactive(sb);
2540         kfree(calldata);
2541 }
2542
2543 static void nfs4_close_done(struct rpc_task *task, void *data)
2544 {
2545         struct nfs4_closedata *calldata = data;
2546         struct nfs4_state *state = calldata->state;
2547         struct nfs_server *server = NFS_SERVER(calldata->inode);
2548
2549         dprintk("%s: begin!\n", __func__);
2550         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2551                 return;
2552         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2553         /* hmm. we are done with the inode, and in the process of freeing
2554          * the state_owner. we keep this around to process errors
2555          */
2556         switch (task->tk_status) {
2557                 case 0:
2558                         if (calldata->roc)
2559                                 pnfs_roc_set_barrier(state->inode,
2560                                                      calldata->roc_barrier);
2561                         nfs_clear_open_stateid(state, &calldata->res.stateid, 0);
2562                         renew_lease(server, calldata->timestamp);
2563                         goto out_release;
2564                 case -NFS4ERR_ADMIN_REVOKED:
2565                 case -NFS4ERR_STALE_STATEID:
2566                 case -NFS4ERR_OLD_STATEID:
2567                 case -NFS4ERR_BAD_STATEID:
2568                 case -NFS4ERR_EXPIRED:
2569                         if (calldata->arg.fmode == 0)
2570                                 break;
2571                 default:
2572                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2573                                 rpc_restart_call_prepare(task);
2574                                 goto out_release;
2575                         }
2576         }
2577         nfs_clear_open_stateid(state, NULL, calldata->arg.fmode);
2578 out_release:
2579         nfs_release_seqid(calldata->arg.seqid);
2580         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2581         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2582 }
2583
2584 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2585 {
2586         struct nfs4_closedata *calldata = data;
2587         struct nfs4_state *state = calldata->state;
2588         struct inode *inode = calldata->inode;
2589         int call_close = 0;
2590
2591         dprintk("%s: begin!\n", __func__);
2592         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2593                 goto out_wait;
2594
2595         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2596         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2597         spin_lock(&state->owner->so_lock);
2598         /* Calculate the change in open mode */
2599         if (state->n_rdwr == 0) {
2600                 if (state->n_rdonly == 0) {
2601                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2602                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2603                         calldata->arg.fmode &= ~FMODE_READ;
2604                 }
2605                 if (state->n_wronly == 0) {
2606                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2607                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2608                         calldata->arg.fmode &= ~FMODE_WRITE;
2609                 }
2610         }
2611         if (!nfs4_valid_open_stateid(state))
2612                 call_close = 0;
2613         spin_unlock(&state->owner->so_lock);
2614
2615         if (!call_close) {
2616                 /* Note: exit _without_ calling nfs4_close_done */
2617                 goto out_no_action;
2618         }
2619
2620         if (calldata->arg.fmode == 0) {
2621                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2622                 if (calldata->roc &&
2623                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2624                         nfs_release_seqid(calldata->arg.seqid);
2625                         goto out_wait;
2626                     }
2627         }
2628
2629         nfs_fattr_init(calldata->res.fattr);
2630         calldata->timestamp = jiffies;
2631         if (nfs4_setup_sequence(NFS_SERVER(inode),
2632                                 &calldata->arg.seq_args,
2633                                 &calldata->res.seq_res,
2634                                 task) != 0)
2635                 nfs_release_seqid(calldata->arg.seqid);
2636         dprintk("%s: done!\n", __func__);
2637         return;
2638 out_no_action:
2639         task->tk_action = NULL;
2640 out_wait:
2641         nfs4_sequence_done(task, &calldata->res.seq_res);
2642 }
2643
2644 static const struct rpc_call_ops nfs4_close_ops = {
2645         .rpc_call_prepare = nfs4_close_prepare,
2646         .rpc_call_done = nfs4_close_done,
2647         .rpc_release = nfs4_free_closedata,
2648 };
2649
2650 /*
2651  * It is possible for data to be read/written from a mem-mapped file
2652  * after the sys_close call (which hits the vfs layer as a flush).
2653  * This means that we can't safely call nfsv4 close on a file until
2654  * the inode is cleared. This in turn means that we are not good
2655  * NFSv4 citizens - we do not indicate to the server to update the file's
2656  * share state even when we are done with one of the three share
2657  * stateid's in the inode.
2658  *
2659  * NOTE: Caller must be holding the sp->so_owner semaphore!
2660  */
2661 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2662 {
2663         struct nfs_server *server = NFS_SERVER(state->inode);
2664         struct nfs4_closedata *calldata;
2665         struct nfs4_state_owner *sp = state->owner;
2666         struct rpc_task *task;
2667         struct rpc_message msg = {
2668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2669                 .rpc_cred = state->owner->so_cred,
2670         };
2671         struct rpc_task_setup task_setup_data = {
2672                 .rpc_client = server->client,
2673                 .rpc_message = &msg,
2674                 .callback_ops = &nfs4_close_ops,
2675                 .workqueue = nfsiod_workqueue,
2676                 .flags = RPC_TASK_ASYNC,
2677         };
2678         int status = -ENOMEM;
2679
2680         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2681                 &task_setup_data.rpc_client, &msg);
2682
2683         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2684         if (calldata == NULL)
2685                 goto out;
2686         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2687         calldata->inode = state->inode;
2688         calldata->state = state;
2689         calldata->arg.fh = NFS_FH(state->inode);
2690         calldata->arg.stateid = &state->open_stateid;
2691         /* Serialization for the sequence id */
2692         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2693         if (calldata->arg.seqid == NULL)
2694                 goto out_free_calldata;
2695         calldata->arg.fmode = 0;
2696         calldata->arg.bitmask = server->cache_consistency_bitmask;
2697         calldata->res.fattr = &calldata->fattr;
2698         calldata->res.seqid = calldata->arg.seqid;
2699         calldata->res.server = server;
2700         calldata->roc = pnfs_roc(state->inode);
2701         nfs_sb_active(calldata->inode->i_sb);
2702
2703         msg.rpc_argp = &calldata->arg;
2704         msg.rpc_resp = &calldata->res;
2705         task_setup_data.callback_data = calldata;
2706         task = rpc_run_task(&task_setup_data);
2707         if (IS_ERR(task))
2708                 return PTR_ERR(task);
2709         status = 0;
2710         if (wait)
2711                 status = rpc_wait_for_completion_task(task);
2712         rpc_put_task(task);
2713         return status;
2714 out_free_calldata:
2715         kfree(calldata);
2716 out:
2717         nfs4_put_open_state(state);
2718         nfs4_put_state_owner(sp);
2719         return status;
2720 }
2721
2722 static struct inode *
2723 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2724                 int open_flags, struct iattr *attr, int *opened)
2725 {
2726         struct nfs4_state *state;
2727         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2728
2729         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2730
2731         /* Protect against concurrent sillydeletes */
2732         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2733
2734         nfs4_label_release_security(label);
2735
2736         if (IS_ERR(state))
2737                 return ERR_CAST(state);
2738         return state->inode;
2739 }
2740
2741 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2742 {
2743         if (ctx->state == NULL)
2744                 return;
2745         if (is_sync)
2746                 nfs4_close_sync(ctx->state, ctx->mode);
2747         else
2748                 nfs4_close_state(ctx->state, ctx->mode);
2749 }
2750
2751 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2752 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2753 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2754
2755 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2756 {
2757         struct nfs4_server_caps_arg args = {
2758                 .fhandle = fhandle,
2759         };
2760         struct nfs4_server_caps_res res = {};
2761         struct rpc_message msg = {
2762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2763                 .rpc_argp = &args,
2764                 .rpc_resp = &res,
2765         };
2766         int status;
2767
2768         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2769         if (status == 0) {
2770                 /* Sanity check the server answers */
2771                 switch (server->nfs_client->cl_minorversion) {
2772                 case 0:
2773                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2774                         res.attr_bitmask[2] = 0;
2775                         break;
2776                 case 1:
2777                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2778                         break;
2779                 case 2:
2780                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2781                 }
2782                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2783                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2784                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2785                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2786                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2787                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2788                                 NFS_CAP_SECURITY_LABEL);
2789                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2790                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2791                         server->caps |= NFS_CAP_ACLS;
2792                 if (res.has_links != 0)
2793                         server->caps |= NFS_CAP_HARDLINKS;
2794                 if (res.has_symlinks != 0)
2795                         server->caps |= NFS_CAP_SYMLINKS;
2796                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2797                         server->caps |= NFS_CAP_FILEID;
2798                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2799                         server->caps |= NFS_CAP_MODE;
2800                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2801                         server->caps |= NFS_CAP_NLINK;
2802                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2803                         server->caps |= NFS_CAP_OWNER;
2804                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2805                         server->caps |= NFS_CAP_OWNER_GROUP;
2806                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2807                         server->caps |= NFS_CAP_ATIME;
2808                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2809                         server->caps |= NFS_CAP_CTIME;
2810                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2811                         server->caps |= NFS_CAP_MTIME;
2812 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2813                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2814                         server->caps |= NFS_CAP_SECURITY_LABEL;
2815 #endif
2816                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2817                                 sizeof(server->attr_bitmask));
2818                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2819
2820                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2821                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2822                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2823                 server->cache_consistency_bitmask[2] = 0;
2824                 server->acl_bitmask = res.acl_bitmask;
2825                 server->fh_expire_type = res.fh_expire_type;
2826         }
2827
2828         return status;
2829 }
2830
2831 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2832 {
2833         struct nfs4_exception exception = { };
2834         int err;
2835         do {
2836                 err = nfs4_handle_exception(server,
2837                                 _nfs4_server_capabilities(server, fhandle),
2838                                 &exception);
2839         } while (exception.retry);
2840         return err;
2841 }
2842
2843 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2844                 struct nfs_fsinfo *info)
2845 {
2846         u32 bitmask[3];
2847         struct nfs4_lookup_root_arg args = {
2848                 .bitmask = bitmask,
2849         };
2850         struct nfs4_lookup_res res = {
2851                 .server = server,
2852                 .fattr = info->fattr,
2853                 .fh = fhandle,
2854         };
2855         struct rpc_message msg = {
2856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2857                 .rpc_argp = &args,
2858                 .rpc_resp = &res,
2859         };
2860
2861         bitmask[0] = nfs4_fattr_bitmap[0];
2862         bitmask[1] = nfs4_fattr_bitmap[1];
2863         /*
2864          * Process the label in the upcoming getfattr
2865          */
2866         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2867
2868         nfs_fattr_init(info->fattr);
2869         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2870 }
2871
2872 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2873                 struct nfs_fsinfo *info)
2874 {
2875         struct nfs4_exception exception = { };
2876         int err;
2877         do {
2878                 err = _nfs4_lookup_root(server, fhandle, info);
2879                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2880                 switch (err) {
2881                 case 0:
2882                 case -NFS4ERR_WRONGSEC:
2883                         goto out;
2884                 default:
2885                         err = nfs4_handle_exception(server, err, &exception);
2886                 }
2887         } while (exception.retry);
2888 out:
2889         return err;
2890 }
2891
2892 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2893                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2894 {
2895         struct rpc_auth_create_args auth_args = {
2896                 .pseudoflavor = flavor,
2897         };
2898         struct rpc_auth *auth;
2899         int ret;
2900
2901         auth = rpcauth_create(&auth_args, server->client);
2902         if (IS_ERR(auth)) {
2903                 ret = -EACCES;
2904                 goto out;
2905         }
2906         ret = nfs4_lookup_root(server, fhandle, info);
2907 out:
2908         return ret;
2909 }
2910
2911 /*
2912  * Retry pseudoroot lookup with various security flavors.  We do this when:
2913  *
2914  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2915  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2916  *
2917  * Returns zero on success, or a negative NFS4ERR value, or a
2918  * negative errno value.
2919  */
2920 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2921                               struct nfs_fsinfo *info)
2922 {
2923         /* Per 3530bis 15.33.5 */
2924         static const rpc_authflavor_t flav_array[] = {
2925                 RPC_AUTH_GSS_KRB5P,
2926                 RPC_AUTH_GSS_KRB5I,
2927                 RPC_AUTH_GSS_KRB5,
2928                 RPC_AUTH_UNIX,                  /* courtesy */
2929                 RPC_AUTH_NULL,
2930         };
2931         int status = -EPERM;
2932         size_t i;
2933
2934         if (server->auth_info.flavor_len > 0) {
2935                 /* try each flavor specified by user */
2936                 for (i = 0; i < server->auth_info.flavor_len; i++) {
2937                         status = nfs4_lookup_root_sec(server, fhandle, info,
2938                                                 server->auth_info.flavors[i]);
2939                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2940                                 continue;
2941                         break;
2942                 }
2943         } else {
2944                 /* no flavors specified by user, try default list */
2945                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2946                         status = nfs4_lookup_root_sec(server, fhandle, info,
2947                                                       flav_array[i]);
2948                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2949                                 continue;
2950                         break;
2951                 }
2952         }
2953
2954         /*
2955          * -EACCESS could mean that the user doesn't have correct permissions
2956          * to access the mount.  It could also mean that we tried to mount
2957          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2958          * existing mount programs don't handle -EACCES very well so it should
2959          * be mapped to -EPERM instead.
2960          */
2961         if (status == -EACCES)
2962                 status = -EPERM;
2963         return status;
2964 }
2965
2966 static int nfs4_do_find_root_sec(struct nfs_server *server,
2967                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2968 {
2969         int mv = server->nfs_client->cl_minorversion;
2970         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2971 }
2972
2973 /**
2974  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2975  * @server: initialized nfs_server handle
2976  * @fhandle: we fill in the pseudo-fs root file handle
2977  * @info: we fill in an FSINFO struct
2978  * @auth_probe: probe the auth flavours
2979  *
2980  * Returns zero on success, or a negative errno.
2981  */
2982 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2983                          struct nfs_fsinfo *info,
2984                          bool auth_probe)
2985 {
2986         int status;
2987
2988         switch (auth_probe) {
2989         case false:
2990                 status = nfs4_lookup_root(server, fhandle, info);
2991                 if (status != -NFS4ERR_WRONGSEC)
2992                         break;
2993         default:
2994                 status = nfs4_do_find_root_sec(server, fhandle, info);
2995         }
2996
2997         if (status == 0)
2998                 status = nfs4_server_capabilities(server, fhandle);
2999         if (status == 0)
3000                 status = nfs4_do_fsinfo(server, fhandle, info);
3001
3002         return nfs4_map_errors(status);
3003 }
3004
3005 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3006                               struct nfs_fsinfo *info)
3007 {
3008         int error;
3009         struct nfs_fattr *fattr = info->fattr;
3010         struct nfs4_label *label = NULL;
3011
3012         error = nfs4_server_capabilities(server, mntfh);
3013         if (error < 0) {
3014                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3015                 return error;
3016         }
3017
3018         label = nfs4_label_alloc(server, GFP_KERNEL);
3019         if (IS_ERR(label))
3020                 return PTR_ERR(label);
3021
3022         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3023         if (error < 0) {
3024                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3025                 goto err_free_label;
3026         }
3027
3028         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3029             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3030                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3031
3032 err_free_label:
3033         nfs4_label_free(label);
3034
3035         return error;
3036 }
3037
3038 /*
3039  * Get locations and (maybe) other attributes of a referral.
3040  * Note that we'll actually follow the referral later when
3041  * we detect fsid mismatch in inode revalidation
3042  */
3043 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3044                              const struct qstr *name, struct nfs_fattr *fattr,
3045                              struct nfs_fh *fhandle)
3046 {
3047         int status = -ENOMEM;
3048         struct page *page = NULL;
3049         struct nfs4_fs_locations *locations = NULL;
3050
3051         page = alloc_page(GFP_KERNEL);
3052         if (page == NULL)
3053                 goto out;
3054         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3055         if (locations == NULL)
3056                 goto out;
3057
3058         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3059         if (status != 0)
3060                 goto out;
3061
3062         /*
3063          * If the fsid didn't change, this is a migration event, not a
3064          * referral.  Cause us to drop into the exception handler, which
3065          * will kick off migration recovery.
3066          */
3067         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3068                 dprintk("%s: server did not return a different fsid for"
3069                         " a referral at %s\n", __func__, name->name);
3070                 status = -NFS4ERR_MOVED;
3071                 goto out;
3072         }
3073         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3074         nfs_fixup_referral_attributes(&locations->fattr);
3075
3076         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3077         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3078         memset(fhandle, 0, sizeof(struct nfs_fh));
3079 out:
3080         if (page)
3081                 __free_page(page);
3082         kfree(locations);
3083         return status;
3084 }
3085
3086 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3087                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3088 {
3089         struct nfs4_getattr_arg args = {
3090                 .fh = fhandle,
3091                 .bitmask = server->attr_bitmask,
3092         };
3093         struct nfs4_getattr_res res = {
3094                 .fattr = fattr,
3095                 .label = label,
3096                 .server = server,
3097         };
3098         struct rpc_message msg = {
3099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3100                 .rpc_argp = &args,
3101                 .rpc_resp = &res,
3102         };
3103
3104         args.bitmask = nfs4_bitmask(server, label);
3105
3106         nfs_fattr_init(fattr);
3107         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3108 }
3109
3110 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3111                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3112 {
3113         struct nfs4_exception exception = { };
3114         int err;
3115         do {
3116                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3117                 trace_nfs4_getattr(server, fhandle, fattr, err);
3118                 err = nfs4_handle_exception(server, err,
3119                                 &exception);
3120         } while (exception.retry);
3121         return err;
3122 }
3123
3124 /*
3125  * The file is not closed if it is opened due to the a request to change
3126  * the size of the file. The open call will not be needed once the
3127  * VFS layer lookup-intents are implemented.
3128  *
3129  * Close is called when the inode is destroyed.
3130  * If we haven't opened the file for O_WRONLY, we
3131  * need to in the size_change case to obtain a stateid.
3132  *
3133  * Got race?
3134  * Because OPEN is always done by name in nfsv4, it is
3135  * possible that we opened a different file by the same
3136  * name.  We can recognize this race condition, but we
3137  * can't do anything about it besides returning an error.
3138  *
3139  * This will be fixed with VFS changes (lookup-intent).
3140  */
3141 static int
3142 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3143                   struct iattr *sattr)
3144 {
3145         struct inode *inode = dentry->d_inode;
3146         struct rpc_cred *cred = NULL;
3147         struct nfs4_state *state = NULL;
3148         struct nfs4_label *label = NULL;
3149         int status;
3150
3151         if (pnfs_ld_layoutret_on_setattr(inode))
3152                 pnfs_commit_and_return_layout(inode);
3153
3154         nfs_fattr_init(fattr);
3155
3156         /* Deal with open(O_TRUNC) */
3157         if (sattr->ia_valid & ATTR_OPEN)
3158                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3159
3160         /* Optimization: if the end result is no change, don't RPC */
3161         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3162                 return 0;
3163
3164         /* Search for an existing open(O_WRITE) file */
3165         if (sattr->ia_valid & ATTR_FILE) {
3166                 struct nfs_open_context *ctx;
3167
3168                 ctx = nfs_file_open_context(sattr->ia_file);
3169                 if (ctx) {
3170                         cred = ctx->cred;
3171                         state = ctx->state;
3172                 }
3173         }
3174
3175         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3176         if (IS_ERR(label))
3177                 return PTR_ERR(label);
3178
3179         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3180         if (status == 0) {
3181                 nfs_setattr_update_inode(inode, sattr);
3182                 nfs_setsecurity(inode, fattr, label);
3183         }
3184         nfs4_label_free(label);
3185         return status;
3186 }
3187
3188 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3189                 const struct qstr *name, struct nfs_fh *fhandle,
3190                 struct nfs_fattr *fattr, struct nfs4_label *label)
3191 {
3192         struct nfs_server *server = NFS_SERVER(dir);
3193         int                    status;
3194         struct nfs4_lookup_arg args = {
3195                 .bitmask = server->attr_bitmask,
3196                 .dir_fh = NFS_FH(dir),
3197                 .name = name,
3198         };
3199         struct nfs4_lookup_res res = {
3200                 .server = server,
3201                 .fattr = fattr,
3202                 .label = label,
3203                 .fh = fhandle,
3204         };
3205         struct rpc_message msg = {
3206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3207                 .rpc_argp = &args,
3208                 .rpc_resp = &res,
3209         };
3210
3211         args.bitmask = nfs4_bitmask(server, label);
3212
3213         nfs_fattr_init(fattr);
3214
3215         dprintk("NFS call  lookup %s\n", name->name);
3216         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3217         dprintk("NFS reply lookup: %d\n", status);
3218         return status;
3219 }
3220
3221 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3222 {
3223         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3224                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3225         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3226         fattr->nlink = 2;
3227 }
3228
3229 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3230                                    struct qstr *name, struct nfs_fh *fhandle,
3231                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3232 {
3233         struct nfs4_exception exception = { };
3234         struct rpc_clnt *client = *clnt;
3235         int err;
3236         do {
3237                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3238                 trace_nfs4_lookup(dir, name, err);
3239                 switch (err) {
3240                 case -NFS4ERR_BADNAME:
3241                         err = -ENOENT;
3242                         goto out;
3243                 case -NFS4ERR_MOVED:
3244                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3245                         goto out;
3246                 case -NFS4ERR_WRONGSEC:
3247                         err = -EPERM;
3248                         if (client != *clnt)
3249                                 goto out;
3250                         client = nfs4_create_sec_client(client, dir, name);
3251                         if (IS_ERR(client))
3252                                 return PTR_ERR(client);
3253
3254                         exception.retry = 1;
3255                         break;
3256                 default:
3257                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3258                 }
3259         } while (exception.retry);
3260
3261 out:
3262         if (err == 0)
3263                 *clnt = client;
3264         else if (client != *clnt)
3265                 rpc_shutdown_client(client);
3266
3267         return err;
3268 }
3269
3270 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3271                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3272                             struct nfs4_label *label)
3273 {
3274         int status;
3275         struct rpc_clnt *client = NFS_CLIENT(dir);
3276
3277         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3278         if (client != NFS_CLIENT(dir)) {
3279                 rpc_shutdown_client(client);
3280                 nfs_fixup_secinfo_attributes(fattr);
3281         }
3282         return status;
3283 }
3284
3285 struct rpc_clnt *
3286 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3287                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3288 {
3289         struct rpc_clnt *client = NFS_CLIENT(dir);
3290         int status;
3291
3292         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3293         if (status < 0)
3294                 return ERR_PTR(status);
3295         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3296 }
3297
3298 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3299 {
3300         struct nfs_server *server = NFS_SERVER(inode);
3301         struct nfs4_accessargs args = {
3302                 .fh = NFS_FH(inode),
3303                 .bitmask = server->cache_consistency_bitmask,
3304         };
3305         struct nfs4_accessres res = {
3306                 .server = server,
3307         };
3308         struct rpc_message msg = {
3309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3310                 .rpc_argp = &args,
3311                 .rpc_resp = &res,
3312                 .rpc_cred = entry->cred,
3313         };
3314         int mode = entry->mask;
3315         int status = 0;
3316
3317         /*
3318          * Determine which access bits we want to ask for...
3319          */
3320         if (mode & MAY_READ)
3321                 args.access |= NFS4_ACCESS_READ;
3322         if (S_ISDIR(inode->i_mode)) {
3323                 if (mode & MAY_WRITE)
3324                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3325                 if (mode & MAY_EXEC)
3326                         args.access |= NFS4_ACCESS_LOOKUP;
3327         } else {
3328                 if (mode & MAY_WRITE)
3329                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3330                 if (mode & MAY_EXEC)
3331                         args.access |= NFS4_ACCESS_EXECUTE;
3332         }
3333
3334         res.fattr = nfs_alloc_fattr();
3335         if (res.fattr == NULL)
3336                 return -ENOMEM;
3337
3338         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3339         if (!status) {
3340                 nfs_access_set_mask(entry, res.access);
3341                 nfs_refresh_inode(inode, res.fattr);
3342         }
3343         nfs_free_fattr(res.fattr);
3344         return status;
3345 }
3346
3347 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3348 {
3349         struct nfs4_exception exception = { };
3350         int err;
3351         do {
3352                 err = _nfs4_proc_access(inode, entry);
3353                 trace_nfs4_access(inode, err);
3354                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3355                                 &exception);
3356         } while (exception.retry);
3357         return err;
3358 }
3359
3360 /*
3361  * TODO: For the time being, we don't try to get any attributes
3362  * along with any of the zero-copy operations READ, READDIR,
3363  * READLINK, WRITE.
3364  *
3365  * In the case of the first three, we want to put the GETATTR
3366  * after the read-type operation -- this is because it is hard
3367  * to predict the length of a GETATTR response in v4, and thus
3368  * align the READ data correctly.  This means that the GETATTR
3369  * may end up partially falling into the page cache, and we should
3370  * shift it into the 'tail' of the xdr_buf before processing.
3371  * To do this efficiently, we need to know the total length
3372  * of data received, which doesn't seem to be available outside
3373  * of the RPC layer.
3374  *
3375  * In the case of WRITE, we also want to put the GETATTR after
3376  * the operation -- in this case because we want to make sure
3377  * we get the post-operation mtime and size.
3378  *
3379  * Both of these changes to the XDR layer would in fact be quite
3380  * minor, but I decided to leave them for a subsequent patch.
3381  */
3382 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3383                 unsigned int pgbase, unsigned int pglen)
3384 {
3385         struct nfs4_readlink args = {
3386                 .fh       = NFS_FH(inode),
3387                 .pgbase   = pgbase,
3388                 .pglen    = pglen,
3389                 .pages    = &page,
3390         };
3391         struct nfs4_readlink_res res;
3392         struct rpc_message msg = {
3393                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3394                 .rpc_argp = &args,
3395                 .rpc_resp = &res,
3396         };
3397
3398         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3399 }
3400
3401 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3402                 unsigned int pgbase, unsigned int pglen)
3403 {
3404         struct nfs4_exception exception = { };
3405         int err;
3406         do {
3407                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3408                 trace_nfs4_readlink(inode, err);
3409                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3410                                 &exception);
3411         } while (exception.retry);
3412         return err;
3413 }
3414
3415 /*
3416  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3417  */
3418 static int
3419 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3420                  int flags)
3421 {
3422         struct nfs4_label l, *ilabel = NULL;
3423         struct nfs_open_context *ctx;
3424         struct nfs4_state *state;
3425         int opened = 0;
3426         int status = 0;
3427
3428         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3429         if (IS_ERR(ctx))
3430                 return PTR_ERR(ctx);
3431
3432         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3433
3434         sattr->ia_mode &= ~current_umask();
3435         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3436         if (IS_ERR(state)) {
3437                 status = PTR_ERR(state);
3438                 goto out;
3439         }
3440 out:
3441         nfs4_label_release_security(ilabel);
3442         put_nfs_open_context(ctx);
3443         return status;
3444 }
3445
3446 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3447 {
3448         struct nfs_server *server = NFS_SERVER(dir);
3449         struct nfs_removeargs args = {
3450                 .fh = NFS_FH(dir),
3451                 .name = *name,
3452         };
3453         struct nfs_removeres res = {
3454                 .server = server,
3455         };
3456         struct rpc_message msg = {
3457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3458                 .rpc_argp = &args,
3459                 .rpc_resp = &res,
3460         };
3461         int status;
3462
3463         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3464         if (status == 0)
3465                 update_changeattr(dir, &res.cinfo);
3466         return status;
3467 }
3468
3469 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3470 {
3471         struct nfs4_exception exception = { };
3472         int err;
3473         do {
3474                 err = _nfs4_proc_remove(dir, name);
3475                 trace_nfs4_remove(dir, name, err);
3476                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3477                                 &exception);
3478         } while (exception.retry);
3479         return err;
3480 }
3481
3482 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3483 {
3484         struct nfs_server *server = NFS_SERVER(dir);
3485         struct nfs_removeargs *args = msg->rpc_argp;
3486         struct nfs_removeres *res = msg->rpc_resp;
3487
3488         res->server = server;
3489         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3490         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3491
3492         nfs_fattr_init(res->dir_attr);
3493 }
3494
3495 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3496 {
3497         nfs4_setup_sequence(NFS_SERVER(data->dir),
3498                         &data->args.seq_args,
3499                         &data->res.seq_res,
3500                         task);
3501 }
3502
3503 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3504 {
3505         struct nfs_unlinkdata *data = task->tk_calldata;
3506         struct nfs_removeres *res = &data->res;
3507
3508         if (!nfs4_sequence_done(task, &res->seq_res))
3509                 return 0;
3510         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3511                 return 0;
3512         update_changeattr(dir, &res->cinfo);
3513         return 1;
3514 }
3515
3516 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3517 {
3518         struct nfs_server *server = NFS_SERVER(dir);
3519         struct nfs_renameargs *arg = msg->rpc_argp;
3520         struct nfs_renameres *res = msg->rpc_resp;
3521
3522         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3523         res->server = server;
3524         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3525 }
3526
3527 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3528 {
3529         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3530                         &data->args.seq_args,
3531                         &data->res.seq_res,
3532                         task);
3533 }
3534
3535 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3536                                  struct inode *new_dir)
3537 {
3538         struct nfs_renamedata *data = task->tk_calldata;
3539         struct nfs_renameres *res = &data->res;
3540
3541         if (!nfs4_sequence_done(task, &res->seq_res))
3542                 return 0;
3543         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3544                 return 0;
3545
3546         update_changeattr(old_dir, &res->old_cinfo);
3547         update_changeattr(new_dir, &res->new_cinfo);
3548         return 1;
3549 }
3550
3551 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3552 {
3553         struct nfs_server *server = NFS_SERVER(inode);
3554         struct nfs4_link_arg arg = {
3555                 .fh     = NFS_FH(inode),
3556                 .dir_fh = NFS_FH(dir),
3557                 .name   = name,
3558                 .bitmask = server->attr_bitmask,
3559         };
3560         struct nfs4_link_res res = {
3561                 .server = server,
3562                 .label = NULL,
3563         };
3564         struct rpc_message msg = {
3565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3566                 .rpc_argp = &arg,
3567                 .rpc_resp = &res,
3568         };
3569         int status = -ENOMEM;
3570
3571         res.fattr = nfs_alloc_fattr();
3572         if (res.fattr == NULL)
3573                 goto out;
3574
3575         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3576         if (IS_ERR(res.label)) {
3577                 status = PTR_ERR(res.label);
3578                 goto out;
3579         }
3580         arg.bitmask = nfs4_bitmask(server, res.label);
3581
3582         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3583         if (!status) {
3584                 update_changeattr(dir, &res.cinfo);
3585                 status = nfs_post_op_update_inode(inode, res.fattr);
3586                 if (!status)
3587                         nfs_setsecurity(inode, res.fattr, res.label);
3588         }
3589
3590
3591         nfs4_label_free(res.label);
3592
3593 out:
3594         nfs_free_fattr(res.fattr);
3595         return status;
3596 }
3597
3598 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3599 {
3600         struct nfs4_exception exception = { };
3601         int err;
3602         do {
3603                 err = nfs4_handle_exception(NFS_SERVER(inode),
3604                                 _nfs4_proc_link(inode, dir, name),
3605                                 &exception);
3606         } while (exception.retry);
3607         return err;
3608 }
3609
3610 struct nfs4_createdata {
3611         struct rpc_message msg;
3612         struct nfs4_create_arg arg;
3613         struct nfs4_create_res res;
3614         struct nfs_fh fh;
3615         struct nfs_fattr fattr;
3616         struct nfs4_label *label;
3617 };
3618
3619 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3620                 struct qstr *name, struct iattr *sattr, u32 ftype)
3621 {
3622         struct nfs4_createdata *data;
3623
3624         data = kzalloc(sizeof(*data), GFP_KERNEL);
3625         if (data != NULL) {
3626                 struct nfs_server *server = NFS_SERVER(dir);
3627
3628                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3629                 if (IS_ERR(data->label))
3630                         goto out_free;
3631
3632                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3633                 data->msg.rpc_argp = &data->arg;
3634                 data->msg.rpc_resp = &data->res;
3635                 data->arg.dir_fh = NFS_FH(dir);
3636                 data->arg.server = server;
3637                 data->arg.name = name;
3638                 data->arg.attrs = sattr;
3639                 data->arg.ftype = ftype;
3640                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3641                 data->res.server = server;
3642                 data->res.fh = &data->fh;
3643                 data->res.fattr = &data->fattr;
3644                 data->res.label = data->label;
3645                 nfs_fattr_init(data->res.fattr);
3646         }
3647         return data;
3648 out_free:
3649         kfree(data);
3650         return NULL;
3651 }
3652
3653 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3654 {
3655         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3656                                     &data->arg.seq_args, &data->res.seq_res, 1);
3657         if (status == 0) {
3658                 update_changeattr(dir, &data->res.dir_cinfo);
3659                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3660         }
3661         return status;
3662 }
3663
3664 static void nfs4_free_createdata(struct nfs4_createdata *data)
3665 {
3666         nfs4_label_free(data->label);
3667         kfree(data);
3668 }
3669
3670 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3671                 struct page *page, unsigned int len, struct iattr *sattr,
3672                 struct nfs4_label *label)
3673 {
3674         struct nfs4_createdata *data;
3675         int status = -ENAMETOOLONG;
3676
3677         if (len > NFS4_MAXPATHLEN)
3678                 goto out;
3679
3680         status = -ENOMEM;
3681         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3682         if (data == NULL)
3683                 goto out;
3684
3685         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3686         data->arg.u.symlink.pages = &page;
3687         data->arg.u.symlink.len = len;
3688         data->arg.label = label;
3689
3690         status = nfs4_do_create(dir, dentry, data);
3691
3692         nfs4_free_createdata(data);
3693 out:
3694         return status;
3695 }
3696
3697 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3698                 struct page *page, unsigned int len, struct iattr *sattr)
3699 {
3700         struct nfs4_exception exception = { };
3701         struct nfs4_label l, *label = NULL;
3702         int err;
3703
3704         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3705
3706         do {
3707                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3708                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3709                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3710                                 &exception);
3711         } while (exception.retry);
3712
3713         nfs4_label_release_security(label);
3714         return err;
3715 }
3716
3717 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3718                 struct iattr *sattr, struct nfs4_label *label)
3719 {
3720         struct nfs4_createdata *data;
3721         int status = -ENOMEM;
3722
3723         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3724         if (data == NULL)
3725                 goto out;
3726
3727         data->arg.label = label;
3728         status = nfs4_do_create(dir, dentry, data);
3729
3730         nfs4_free_createdata(data);
3731 out:
3732         return status;
3733 }
3734
3735 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3736                 struct iattr *sattr)
3737 {
3738         struct nfs4_exception exception = { };
3739         struct nfs4_label l, *label = NULL;
3740         int err;
3741
3742         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3743
3744         sattr->ia_mode &= ~current_umask();
3745         do {
3746                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3747                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3748                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3749                                 &exception);
3750         } while (exception.retry);
3751         nfs4_label_release_security(label);
3752
3753         return err;
3754 }
3755
3756 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3757                 u64 cookie, struct page **pages, unsigned int count, int plus)
3758 {
3759         struct inode            *dir = dentry->d_inode;
3760         struct nfs4_readdir_arg args = {
3761                 .fh = NFS_FH(dir),
3762                 .pages = pages,
3763                 .pgbase = 0,
3764                 .count = count,
3765                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3766                 .plus = plus,
3767         };
3768         struct nfs4_readdir_res res;
3769         struct rpc_message msg = {
3770                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3771                 .rpc_argp = &args,
3772                 .rpc_resp = &res,
3773                 .rpc_cred = cred,
3774         };
3775         int                     status;
3776
3777         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3778                         dentry,
3779                         (unsigned long long)cookie);
3780         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3781         res.pgbase = args.pgbase;
3782         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3783         if (status >= 0) {
3784                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3785                 status += args.pgbase;
3786         }
3787
3788         nfs_invalidate_atime(dir);
3789
3790         dprintk("%s: returns %d\n", __func__, status);
3791         return status;
3792 }
3793
3794 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3795                 u64 cookie, struct page **pages, unsigned int count, int plus)
3796 {
3797         struct nfs4_exception exception = { };
3798         int err;
3799         do {
3800                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3801                                 pages, count, plus);
3802                 trace_nfs4_readdir(dentry->d_inode, err);
3803                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3804                                 &exception);
3805         } while (exception.retry);
3806         return err;
3807 }
3808
3809 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3810                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3811 {
3812         struct nfs4_createdata *data;
3813         int mode = sattr->ia_mode;
3814         int status = -ENOMEM;
3815
3816         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3817         if (data == NULL)
3818                 goto out;
3819
3820         if (S_ISFIFO(mode))
3821                 data->arg.ftype = NF4FIFO;
3822         else if (S_ISBLK(mode)) {
3823                 data->arg.ftype = NF4BLK;
3824                 data->arg.u.device.specdata1 = MAJOR(rdev);
3825                 data->arg.u.device.specdata2 = MINOR(rdev);
3826         }
3827         else if (S_ISCHR(mode)) {
3828                 data->arg.ftype = NF4CHR;
3829                 data->arg.u.device.specdata1 = MAJOR(rdev);
3830                 data->arg.u.device.specdata2 = MINOR(rdev);
3831         } else if (!S_ISSOCK(mode)) {
3832                 status = -EINVAL;
3833                 goto out_free;
3834         }
3835
3836         data->arg.label = label;
3837         status = nfs4_do_create(dir, dentry, data);
3838 out_free:
3839         nfs4_free_createdata(data);
3840 out:
3841         return status;
3842 }
3843
3844 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3845                 struct iattr *sattr, dev_t rdev)
3846 {
3847         struct nfs4_exception exception = { };
3848         struct nfs4_label l, *label = NULL;
3849         int err;
3850
3851         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3852
3853         sattr->ia_mode &= ~current_umask();
3854         do {
3855                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3856                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3857                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3858                                 &exception);
3859         } while (exception.retry);
3860
3861         nfs4_label_release_security(label);
3862
3863         return err;
3864 }
3865
3866 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3867                  struct nfs_fsstat *fsstat)
3868 {
3869         struct nfs4_statfs_arg args = {
3870                 .fh = fhandle,
3871                 .bitmask = server->attr_bitmask,
3872         };
3873         struct nfs4_statfs_res res = {
3874                 .fsstat = fsstat,
3875         };
3876         struct rpc_message msg = {
3877                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3878                 .rpc_argp = &args,
3879                 .rpc_resp = &res,
3880         };
3881
3882         nfs_fattr_init(fsstat->fattr);
3883         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3884 }
3885
3886 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3887 {
3888         struct nfs4_exception exception = { };
3889         int err;
3890         do {
3891                 err = nfs4_handle_exception(server,
3892                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3893                                 &exception);
3894         } while (exception.retry);
3895         return err;
3896 }
3897
3898 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3899                 struct nfs_fsinfo *fsinfo)
3900 {
3901         struct nfs4_fsinfo_arg args = {
3902                 .fh = fhandle,
3903                 .bitmask = server->attr_bitmask,
3904         };
3905         struct nfs4_fsinfo_res res = {
3906                 .fsinfo = fsinfo,
3907         };
3908         struct rpc_message msg = {
3909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3910                 .rpc_argp = &args,
3911                 .rpc_resp = &res,
3912         };
3913
3914         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3915 }
3916
3917 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3918 {
3919         struct nfs4_exception exception = { };
3920         unsigned long now = jiffies;
3921         int err;
3922
3923         do {
3924                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3925                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3926                 if (err == 0) {
3927                         struct nfs_client *clp = server->nfs_client;
3928
3929                         spin_lock(&clp->cl_lock);
3930                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3931                         clp->cl_last_renewal = now;
3932                         spin_unlock(&clp->cl_lock);
3933                         break;
3934                 }
3935                 err = nfs4_handle_exception(server, err, &exception);
3936         } while (exception.retry);
3937         return err;
3938 }
3939
3940 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3941 {
3942         int error;
3943
3944         nfs_fattr_init(fsinfo->fattr);
3945         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3946         if (error == 0) {
3947                 /* block layout checks this! */
3948                 server->pnfs_blksize = fsinfo->blksize;
3949                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3950         }
3951
3952         return error;
3953 }
3954
3955 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3956                 struct nfs_pathconf *pathconf)
3957 {
3958         struct nfs4_pathconf_arg args = {
3959                 .fh = fhandle,
3960                 .bitmask = server->attr_bitmask,
3961         };
3962         struct nfs4_pathconf_res res = {
3963                 .pathconf = pathconf,
3964         };
3965         struct rpc_message msg = {
3966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3967                 .rpc_argp = &args,
3968                 .rpc_resp = &res,
3969         };
3970
3971         /* None of the pathconf attributes are mandatory to implement */
3972         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3973                 memset(pathconf, 0, sizeof(*pathconf));
3974                 return 0;
3975         }
3976
3977         nfs_fattr_init(pathconf->fattr);
3978         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3979 }
3980
3981 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3982                 struct nfs_pathconf *pathconf)
3983 {
3984         struct nfs4_exception exception = { };
3985         int err;
3986
3987         do {
3988                 err = nfs4_handle_exception(server,
3989                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3990                                 &exception);
3991         } while (exception.retry);
3992         return err;
3993 }
3994
3995 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3996                 const struct nfs_open_context *ctx,
3997                 const struct nfs_lock_context *l_ctx,
3998                 fmode_t fmode)
3999 {
4000         const struct nfs_lockowner *lockowner = NULL;
4001
4002         if (l_ctx != NULL)
4003                 lockowner = &l_ctx->lockowner;
4004         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4005 }
4006 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4007
4008 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4009                 const struct nfs_open_context *ctx,
4010                 const struct nfs_lock_context *l_ctx,
4011                 fmode_t fmode)
4012 {
4013         nfs4_stateid current_stateid;
4014
4015         /* If the current stateid represents a lost lock, then exit */
4016         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4017                 return true;
4018         return nfs4_stateid_match(stateid, &current_stateid);
4019 }
4020
4021 static bool nfs4_error_stateid_expired(int err)
4022 {
4023         switch (err) {
4024         case -NFS4ERR_DELEG_REVOKED:
4025         case -NFS4ERR_ADMIN_REVOKED:
4026         case -NFS4ERR_BAD_STATEID:
4027         case -NFS4ERR_STALE_STATEID:
4028         case -NFS4ERR_OLD_STATEID:
4029         case -NFS4ERR_OPENMODE:
4030         case -NFS4ERR_EXPIRED:
4031                 return true;
4032         }
4033         return false;
4034 }
4035
4036 void __nfs4_read_done_cb(struct nfs_read_data *data)
4037 {
4038         nfs_invalidate_atime(data->header->inode);
4039 }
4040
4041 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4042 {
4043         struct nfs_server *server = NFS_SERVER(data->header->inode);
4044
4045         trace_nfs4_read(data, task->tk_status);
4046         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4047                 rpc_restart_call_prepare(task);
4048                 return -EAGAIN;
4049         }
4050
4051         __nfs4_read_done_cb(data);
4052         if (task->tk_status > 0)
4053                 renew_lease(server, data->timestamp);
4054         return 0;
4055 }
4056
4057 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4058                 struct nfs_readargs *args)
4059 {
4060
4061         if (!nfs4_error_stateid_expired(task->tk_status) ||
4062                 nfs4_stateid_is_current(&args->stateid,
4063                                 args->context,
4064                                 args->lock_context,
4065                                 FMODE_READ))
4066                 return false;
4067         rpc_restart_call_prepare(task);
4068         return true;
4069 }
4070
4071 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4072 {
4073
4074         dprintk("--> %s\n", __func__);
4075
4076         if (!nfs4_sequence_done(task, &data->res.seq_res))
4077                 return -EAGAIN;
4078         if (nfs4_read_stateid_changed(task, &data->args))
4079                 return -EAGAIN;
4080         return data->read_done_cb ? data->read_done_cb(task, data) :
4081                                     nfs4_read_done_cb(task, data);
4082 }
4083
4084 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4085 {
4086         data->timestamp   = jiffies;
4087         data->read_done_cb = nfs4_read_done_cb;
4088         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4089         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4090 }
4091
4092 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4093 {
4094         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4095                         &data->args.seq_args,
4096                         &data->res.seq_res,
4097                         task))
4098                 return 0;
4099         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4100                                 data->args.lock_context, FMODE_READ) == -EIO)
4101                 return -EIO;
4102         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4103                 return -EIO;
4104         return 0;
4105 }
4106
4107 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4108 {
4109         struct inode *inode = data->header->inode;
4110
4111         trace_nfs4_write(data, task->tk_status);
4112         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4113                 rpc_restart_call_prepare(task);
4114                 return -EAGAIN;
4115         }
4116         if (task->tk_status >= 0) {
4117                 renew_lease(NFS_SERVER(inode), data->timestamp);
4118                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4119         }
4120         return 0;
4121 }
4122
4123 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4124                 struct nfs_writeargs *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_WRITE))
4132                 return false;
4133         rpc_restart_call_prepare(task);
4134         return true;
4135 }
4136
4137 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4138 {
4139         if (!nfs4_sequence_done(task, &data->res.seq_res))
4140                 return -EAGAIN;
4141         if (nfs4_write_stateid_changed(task, &data->args))
4142                 return -EAGAIN;
4143         return data->write_done_cb ? data->write_done_cb(task, data) :
4144                 nfs4_write_done_cb(task, data);
4145 }
4146
4147 static
4148 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4149 {
4150         const struct nfs_pgio_header *hdr = data->header;
4151
4152         /* Don't request attributes for pNFS or O_DIRECT writes */
4153         if (data->ds_clp != NULL || hdr->dreq != NULL)
4154                 return false;
4155         /* Otherwise, request attributes if and only if we don't hold
4156          * a delegation
4157          */
4158         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4159 }
4160
4161 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4162 {
4163         struct nfs_server *server = NFS_SERVER(data->header->inode);
4164
4165         if (!nfs4_write_need_cache_consistency_data(data)) {
4166                 data->args.bitmask = NULL;
4167                 data->res.fattr = NULL;
4168         } else
4169                 data->args.bitmask = server->cache_consistency_bitmask;
4170
4171         if (!data->write_done_cb)
4172                 data->write_done_cb = nfs4_write_done_cb;
4173         data->res.server = server;
4174         data->timestamp   = jiffies;
4175
4176         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4177         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4178 }
4179
4180 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4181 {
4182         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4183                         &data->args.seq_args,
4184                         &data->res.seq_res,
4185                         task))
4186                 return 0;
4187         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4188                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4189                 return -EIO;
4190         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4191                 return -EIO;
4192         return 0;
4193 }
4194
4195 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4196 {
4197         nfs4_setup_sequence(NFS_SERVER(data->inode),
4198                         &data->args.seq_args,
4199                         &data->res.seq_res,
4200                         task);
4201 }
4202
4203 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4204 {
4205         struct inode *inode = data->inode;
4206
4207         trace_nfs4_commit(data, task->tk_status);
4208         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4209                 rpc_restart_call_prepare(task);
4210                 return -EAGAIN;
4211         }
4212         return 0;
4213 }
4214
4215 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4216 {
4217         if (!nfs4_sequence_done(task, &data->res.seq_res))
4218                 return -EAGAIN;
4219         return data->commit_done_cb(task, data);
4220 }
4221
4222 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4223 {
4224         struct nfs_server *server = NFS_SERVER(data->inode);
4225
4226         if (data->commit_done_cb == NULL)
4227                 data->commit_done_cb = nfs4_commit_done_cb;
4228         data->res.server = server;
4229         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4230         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4231 }
4232
4233 struct nfs4_renewdata {
4234         struct nfs_client       *client;
4235         unsigned long           timestamp;
4236 };
4237
4238 /*
4239  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4240  * standalone procedure for queueing an asynchronous RENEW.
4241  */
4242 static void nfs4_renew_release(void *calldata)
4243 {
4244         struct nfs4_renewdata *data = calldata;
4245         struct nfs_client *clp = data->client;
4246
4247         if (atomic_read(&clp->cl_count) > 1)
4248                 nfs4_schedule_state_renewal(clp);
4249         nfs_put_client(clp);
4250         kfree(data);
4251 }
4252
4253 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4254 {
4255         struct nfs4_renewdata *data = calldata;
4256         struct nfs_client *clp = data->client;
4257         unsigned long timestamp = data->timestamp;
4258
4259         trace_nfs4_renew_async(clp, task->tk_status);
4260         switch (task->tk_status) {
4261         case 0:
4262                 break;
4263         case -NFS4ERR_LEASE_MOVED:
4264                 nfs4_schedule_lease_moved_recovery(clp);
4265                 break;
4266         default:
4267                 /* Unless we're shutting down, schedule state recovery! */
4268                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4269                         return;
4270                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4271                         nfs4_schedule_lease_recovery(clp);
4272                         return;
4273                 }
4274                 nfs4_schedule_path_down_recovery(clp);
4275         }
4276         do_renew_lease(clp, timestamp);
4277 }
4278
4279 static const struct rpc_call_ops nfs4_renew_ops = {
4280         .rpc_call_done = nfs4_renew_done,
4281         .rpc_release = nfs4_renew_release,
4282 };
4283
4284 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4285 {
4286         struct rpc_message msg = {
4287                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4288                 .rpc_argp       = clp,
4289                 .rpc_cred       = cred,
4290         };
4291         struct nfs4_renewdata *data;
4292
4293         if (renew_flags == 0)
4294                 return 0;
4295         if (!atomic_inc_not_zero(&clp->cl_count))
4296                 return -EIO;
4297         data = kmalloc(sizeof(*data), GFP_NOFS);
4298         if (data == NULL)
4299                 return -ENOMEM;
4300         data->client = clp;
4301         data->timestamp = jiffies;
4302         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4303                         &nfs4_renew_ops, data);
4304 }
4305
4306 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4307 {
4308         struct rpc_message msg = {
4309                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4310                 .rpc_argp       = clp,
4311                 .rpc_cred       = cred,
4312         };
4313         unsigned long now = jiffies;
4314         int status;
4315
4316         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4317         if (status < 0)
4318                 return status;
4319         do_renew_lease(clp, now);
4320         return 0;
4321 }
4322
4323 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4324 {
4325         return server->caps & NFS_CAP_ACLS;
4326 }
4327
4328 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4329  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4330  * the stack.
4331  */
4332 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4333
4334 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4335                 struct page **pages, unsigned int *pgbase)
4336 {
4337         struct page *newpage, **spages;
4338         int rc = 0;
4339         size_t len;
4340         spages = pages;
4341
4342         do {
4343                 len = min_t(size_t, PAGE_SIZE, buflen);
4344                 newpage = alloc_page(GFP_KERNEL);
4345
4346                 if (newpage == NULL)
4347                         goto unwind;
4348                 memcpy(page_address(newpage), buf, len);
4349                 buf += len;
4350                 buflen -= len;
4351                 *pages++ = newpage;
4352                 rc++;
4353         } while (buflen != 0);
4354
4355         return rc;
4356
4357 unwind:
4358         for(; rc > 0; rc--)
4359                 __free_page(spages[rc-1]);
4360         return -ENOMEM;
4361 }
4362
4363 struct nfs4_cached_acl {
4364         int cached;
4365         size_t len;
4366         char data[0];
4367 };
4368
4369 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4370 {
4371         struct nfs_inode *nfsi = NFS_I(inode);
4372
4373         spin_lock(&inode->i_lock);
4374         kfree(nfsi->nfs4_acl);
4375         nfsi->nfs4_acl = acl;
4376         spin_unlock(&inode->i_lock);
4377 }
4378
4379 static void nfs4_zap_acl_attr(struct inode *inode)
4380 {
4381         nfs4_set_cached_acl(inode, NULL);
4382 }
4383
4384 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4385 {
4386         struct nfs_inode *nfsi = NFS_I(inode);
4387         struct nfs4_cached_acl *acl;
4388         int ret = -ENOENT;
4389
4390         spin_lock(&inode->i_lock);
4391         acl = nfsi->nfs4_acl;
4392         if (acl == NULL)
4393                 goto out;
4394         if (buf == NULL) /* user is just asking for length */
4395                 goto out_len;
4396         if (acl->cached == 0)
4397                 goto out;
4398         ret = -ERANGE; /* see getxattr(2) man page */
4399         if (acl->len > buflen)
4400                 goto out;
4401         memcpy(buf, acl->data, acl->len);
4402 out_len:
4403         ret = acl->len;
4404 out:
4405         spin_unlock(&inode->i_lock);
4406         return ret;
4407 }
4408
4409 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4410 {
4411         struct nfs4_cached_acl *acl;
4412         size_t buflen = sizeof(*acl) + acl_len;
4413
4414         if (buflen <= PAGE_SIZE) {
4415                 acl = kmalloc(buflen, GFP_KERNEL);
4416                 if (acl == NULL)
4417                         goto out;
4418                 acl->cached = 1;
4419                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4420         } else {
4421                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4422                 if (acl == NULL)
4423                         goto out;
4424                 acl->cached = 0;
4425         }
4426         acl->len = acl_len;
4427 out:
4428         nfs4_set_cached_acl(inode, acl);
4429 }
4430
4431 /*
4432  * The getxattr API returns the required buffer length when called with a
4433  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4434  * the required buf.  On a NULL buf, we send a page of data to the server
4435  * guessing that the ACL request can be serviced by a page. If so, we cache
4436  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4437  * the cache. If not so, we throw away the page, and cache the required
4438  * length. The next getxattr call will then produce another round trip to
4439  * the server, this time with the input buf of the required size.
4440  */
4441 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4442 {
4443         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4444         struct nfs_getaclargs args = {
4445                 .fh = NFS_FH(inode),
4446                 .acl_pages = pages,
4447                 .acl_len = buflen,
4448         };
4449         struct nfs_getaclres res = {
4450                 .acl_len = buflen,
4451         };
4452         struct rpc_message msg = {
4453                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4454                 .rpc_argp = &args,
4455                 .rpc_resp = &res,
4456         };
4457         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4458         int ret = -ENOMEM, i;
4459
4460         /* As long as we're doing a round trip to the server anyway,
4461          * let's be prepared for a page of acl data. */
4462         if (npages == 0)
4463                 npages = 1;
4464         if (npages > ARRAY_SIZE(pages))
4465                 return -ERANGE;
4466
4467         for (i = 0; i < npages; i++) {
4468                 pages[i] = alloc_page(GFP_KERNEL);
4469                 if (!pages[i])
4470                         goto out_free;
4471         }
4472
4473         /* for decoding across pages */
4474         res.acl_scratch = alloc_page(GFP_KERNEL);
4475         if (!res.acl_scratch)
4476                 goto out_free;
4477
4478         args.acl_len = npages * PAGE_SIZE;
4479         args.acl_pgbase = 0;
4480
4481         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4482                 __func__, buf, buflen, npages, args.acl_len);
4483         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4484                              &msg, &args.seq_args, &res.seq_res, 0);
4485         if (ret)
4486                 goto out_free;
4487
4488         /* Handle the case where the passed-in buffer is too short */
4489         if (res.acl_flags & NFS4_ACL_TRUNC) {
4490                 /* Did the user only issue a request for the acl length? */
4491                 if (buf == NULL)
4492                         goto out_ok;
4493                 ret = -ERANGE;
4494                 goto out_free;
4495         }
4496         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4497         if (buf) {
4498                 if (res.acl_len > buflen) {
4499                         ret = -ERANGE;
4500                         goto out_free;
4501                 }
4502                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4503         }
4504 out_ok:
4505         ret = res.acl_len;
4506 out_free:
4507         for (i = 0; i < npages; i++)
4508                 if (pages[i])
4509                         __free_page(pages[i]);
4510         if (res.acl_scratch)
4511                 __free_page(res.acl_scratch);
4512         return ret;
4513 }
4514
4515 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4516 {
4517         struct nfs4_exception exception = { };
4518         ssize_t ret;
4519         do {
4520                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4521                 trace_nfs4_get_acl(inode, ret);
4522                 if (ret >= 0)
4523                         break;
4524                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4525         } while (exception.retry);
4526         return ret;
4527 }
4528
4529 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4530 {
4531         struct nfs_server *server = NFS_SERVER(inode);
4532         int ret;
4533
4534         if (!nfs4_server_supports_acls(server))
4535                 return -EOPNOTSUPP;
4536         ret = nfs_revalidate_inode(server, inode);
4537         if (ret < 0)
4538                 return ret;
4539         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4540                 nfs_zap_acl_cache(inode);
4541         ret = nfs4_read_cached_acl(inode, buf, buflen);
4542         if (ret != -ENOENT)
4543                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4544                  * but no cached acl data, just the acl length */
4545                 return ret;
4546         return nfs4_get_acl_uncached(inode, buf, buflen);
4547 }
4548
4549 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4550 {
4551         struct nfs_server *server = NFS_SERVER(inode);
4552         struct page *pages[NFS4ACL_MAXPAGES];
4553         struct nfs_setaclargs arg = {
4554                 .fh             = NFS_FH(inode),
4555                 .acl_pages      = pages,
4556                 .acl_len        = buflen,
4557         };
4558         struct nfs_setaclres res;
4559         struct rpc_message msg = {
4560                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4561                 .rpc_argp       = &arg,
4562                 .rpc_resp       = &res,
4563         };
4564         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4565         int ret, i;
4566
4567         if (!nfs4_server_supports_acls(server))
4568                 return -EOPNOTSUPP;
4569         if (npages > ARRAY_SIZE(pages))
4570                 return -ERANGE;
4571         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4572         if (i < 0)
4573                 return i;
4574         nfs4_inode_return_delegation(inode);
4575         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4576
4577         /*
4578          * Free each page after tx, so the only ref left is
4579          * held by the network stack
4580          */
4581         for (; i > 0; i--)
4582                 put_page(pages[i-1]);
4583
4584         /*
4585          * Acl update can result in inode attribute update.
4586          * so mark the attribute cache invalid.
4587          */
4588         spin_lock(&inode->i_lock);
4589         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4590         spin_unlock(&inode->i_lock);
4591         nfs_access_zap_cache(inode);
4592         nfs_zap_acl_cache(inode);
4593         return ret;
4594 }
4595
4596 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4597 {
4598         struct nfs4_exception exception = { };
4599         int err;
4600         do {
4601                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4602                 trace_nfs4_set_acl(inode, err);
4603                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4604                                 &exception);
4605         } while (exception.retry);
4606         return err;
4607 }
4608
4609 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4610 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4611                                         size_t buflen)
4612 {
4613         struct nfs_server *server = NFS_SERVER(inode);
4614         struct nfs_fattr fattr;
4615         struct nfs4_label label = {0, 0, buflen, buf};
4616
4617         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4618         struct nfs4_getattr_arg arg = {
4619                 .fh             = NFS_FH(inode),
4620                 .bitmask        = bitmask,
4621         };
4622         struct nfs4_getattr_res res = {
4623                 .fattr          = &fattr,
4624                 .label          = &label,
4625                 .server         = server,
4626         };
4627         struct rpc_message msg = {
4628                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4629                 .rpc_argp       = &arg,
4630                 .rpc_resp       = &res,
4631         };
4632         int ret;
4633
4634         nfs_fattr_init(&fattr);
4635
4636         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4637         if (ret)
4638                 return ret;
4639         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4640                 return -ENOENT;
4641         if (buflen < label.len)
4642                 return -ERANGE;
4643         return 0;
4644 }
4645
4646 static int nfs4_get_security_label(struct inode *inode, void *buf,
4647                                         size_t buflen)
4648 {
4649         struct nfs4_exception exception = { };
4650         int err;
4651
4652         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4653                 return -EOPNOTSUPP;
4654
4655         do {
4656                 err = _nfs4_get_security_label(inode, buf, buflen);
4657                 trace_nfs4_get_security_label(inode, err);
4658                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4659                                 &exception);
4660         } while (exception.retry);
4661         return err;
4662 }
4663
4664 static int _nfs4_do_set_security_label(struct inode *inode,
4665                 struct nfs4_label *ilabel,
4666                 struct nfs_fattr *fattr,
4667                 struct nfs4_label *olabel)
4668 {
4669
4670         struct iattr sattr = {0};
4671         struct nfs_server *server = NFS_SERVER(inode);
4672         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4673         struct nfs_setattrargs arg = {
4674                 .fh             = NFS_FH(inode),
4675                 .iap            = &sattr,
4676                 .server         = server,
4677                 .bitmask        = bitmask,
4678                 .label          = ilabel,
4679         };
4680         struct nfs_setattrres res = {
4681                 .fattr          = fattr,
4682                 .label          = olabel,
4683                 .server         = server,
4684         };
4685         struct rpc_message msg = {
4686                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4687                 .rpc_argp       = &arg,
4688                 .rpc_resp       = &res,
4689         };
4690         int status;
4691
4692         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4693
4694         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4695         if (status)
4696                 dprintk("%s failed: %d\n", __func__, status);
4697
4698         return status;
4699 }
4700
4701 static int nfs4_do_set_security_label(struct inode *inode,
4702                 struct nfs4_label *ilabel,
4703                 struct nfs_fattr *fattr,
4704                 struct nfs4_label *olabel)
4705 {
4706         struct nfs4_exception exception = { };
4707         int err;
4708
4709         do {
4710                 err = _nfs4_do_set_security_label(inode, ilabel,
4711                                 fattr, olabel);
4712                 trace_nfs4_set_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
4720 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4721 {
4722         struct nfs4_label ilabel, *olabel = NULL;
4723         struct nfs_fattr fattr;
4724         struct rpc_cred *cred;
4725         struct inode *inode = dentry->d_inode;
4726         int status;
4727
4728         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4729                 return -EOPNOTSUPP;
4730
4731         nfs_fattr_init(&fattr);
4732
4733         ilabel.pi = 0;
4734         ilabel.lfs = 0;
4735         ilabel.label = (char *)buf;
4736         ilabel.len = buflen;
4737
4738         cred = rpc_lookup_cred();
4739         if (IS_ERR(cred))
4740                 return PTR_ERR(cred);
4741
4742         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4743         if (IS_ERR(olabel)) {
4744                 status = -PTR_ERR(olabel);
4745                 goto out;
4746         }
4747
4748         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4749         if (status == 0)
4750                 nfs_setsecurity(inode, &fattr, olabel);
4751
4752         nfs4_label_free(olabel);
4753 out:
4754         put_rpccred(cred);
4755         return status;
4756 }
4757 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4758
4759
4760 static int
4761 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4762 {
4763         struct nfs_client *clp = server->nfs_client;
4764
4765         if (task->tk_status >= 0)
4766                 return 0;
4767         switch(task->tk_status) {
4768                 case -NFS4ERR_DELEG_REVOKED:
4769                 case -NFS4ERR_ADMIN_REVOKED:
4770                 case -NFS4ERR_BAD_STATEID:
4771                         if (state == NULL)
4772                                 break;
4773                         nfs_remove_bad_delegation(state->inode);
4774                 case -NFS4ERR_OPENMODE:
4775                         if (state == NULL)
4776                                 break;
4777                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4778                                 goto recovery_failed;
4779                         goto wait_on_recovery;
4780                 case -NFS4ERR_EXPIRED:
4781                         if (state != NULL) {
4782                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4783                                         goto recovery_failed;
4784                         }
4785                 case -NFS4ERR_STALE_STATEID:
4786                 case -NFS4ERR_STALE_CLIENTID:
4787                         nfs4_schedule_lease_recovery(clp);
4788                         goto wait_on_recovery;
4789                 case -NFS4ERR_MOVED:
4790                         if (nfs4_schedule_migration_recovery(server) < 0)
4791                                 goto recovery_failed;
4792                         goto wait_on_recovery;
4793                 case -NFS4ERR_LEASE_MOVED:
4794                         nfs4_schedule_lease_moved_recovery(clp);
4795                         goto wait_on_recovery;
4796 #if defined(CONFIG_NFS_V4_1)
4797                 case -NFS4ERR_BADSESSION:
4798                 case -NFS4ERR_BADSLOT:
4799                 case -NFS4ERR_BAD_HIGH_SLOT:
4800                 case -NFS4ERR_DEADSESSION:
4801                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4802                 case -NFS4ERR_SEQ_FALSE_RETRY:
4803                 case -NFS4ERR_SEQ_MISORDERED:
4804                         dprintk("%s ERROR %d, Reset session\n", __func__,
4805                                 task->tk_status);
4806                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4807                         goto wait_on_recovery;
4808 #endif /* CONFIG_NFS_V4_1 */
4809                 case -NFS4ERR_DELAY:
4810                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4811                 case -NFS4ERR_GRACE:
4812                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4813                 case -NFS4ERR_RETRY_UNCACHED_REP:
4814                 case -NFS4ERR_OLD_STATEID:
4815                         goto restart_call;
4816         }
4817         task->tk_status = nfs4_map_errors(task->tk_status);
4818         return 0;
4819 recovery_failed:
4820         task->tk_status = -EIO;
4821         return 0;
4822 wait_on_recovery:
4823         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4824         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4825                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4826         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4827                 goto recovery_failed;
4828 restart_call:
4829         task->tk_status = 0;
4830         return -EAGAIN;
4831 }
4832
4833 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4834                                     nfs4_verifier *bootverf)
4835 {
4836         __be32 verf[2];
4837
4838         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4839                 /* An impossible timestamp guarantees this value
4840                  * will never match a generated boot time. */
4841                 verf[0] = 0;
4842                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4843         } else {
4844                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4845                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4846                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4847         }
4848         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4849 }
4850
4851 static unsigned int
4852 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4853                                    char *buf, size_t len)
4854 {
4855         unsigned int result;
4856
4857         rcu_read_lock();
4858         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4859                                 clp->cl_ipaddr,
4860                                 rpc_peeraddr2str(clp->cl_rpcclient,
4861                                                         RPC_DISPLAY_ADDR),
4862                                 rpc_peeraddr2str(clp->cl_rpcclient,
4863                                                         RPC_DISPLAY_PROTO));
4864         rcu_read_unlock();
4865         return result;
4866 }
4867
4868 static unsigned int
4869 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4870                                 char *buf, size_t len)
4871 {
4872         const char *nodename = clp->cl_rpcclient->cl_nodename;
4873
4874         if (nfs4_client_id_uniquifier[0] != '\0')
4875                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4876                                 clp->rpc_ops->version,
4877                                 clp->cl_minorversion,
4878                                 nfs4_client_id_uniquifier,
4879                                 nodename);
4880         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4881                                 clp->rpc_ops->version, clp->cl_minorversion,
4882                                 nodename);
4883 }
4884
4885 /*
4886  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4887  * services.  Advertise one based on the address family of the
4888  * clientaddr.
4889  */
4890 static unsigned int
4891 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4892 {
4893         if (strchr(clp->cl_ipaddr, ':') != NULL)
4894                 return scnprintf(buf, len, "tcp6");
4895         else
4896                 return scnprintf(buf, len, "tcp");
4897 }
4898
4899 /**
4900  * nfs4_proc_setclientid - Negotiate client ID
4901  * @clp: state data structure
4902  * @program: RPC program for NFSv4 callback service
4903  * @port: IP port number for NFS4 callback service
4904  * @cred: RPC credential to use for this call
4905  * @res: where to place the result
4906  *
4907  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4908  */
4909 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4910                 unsigned short port, struct rpc_cred *cred,
4911                 struct nfs4_setclientid_res *res)
4912 {
4913         nfs4_verifier sc_verifier;
4914         struct nfs4_setclientid setclientid = {
4915                 .sc_verifier = &sc_verifier,
4916                 .sc_prog = program,
4917                 .sc_cb_ident = clp->cl_cb_ident,
4918         };
4919         struct rpc_message msg = {
4920                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4921                 .rpc_argp = &setclientid,
4922                 .rpc_resp = res,
4923                 .rpc_cred = cred,
4924         };
4925         int status;
4926
4927         /* nfs_client_id4 */
4928         nfs4_init_boot_verifier(clp, &sc_verifier);
4929         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4930                 setclientid.sc_name_len =
4931                                 nfs4_init_uniform_client_string(clp,
4932                                                 setclientid.sc_name,
4933                                                 sizeof(setclientid.sc_name));
4934         else
4935                 setclientid.sc_name_len =
4936                                 nfs4_init_nonuniform_client_string(clp,
4937                                                 setclientid.sc_name,
4938                                                 sizeof(setclientid.sc_name));
4939         /* cb_client4 */
4940         setclientid.sc_netid_len =
4941                                 nfs4_init_callback_netid(clp,
4942                                                 setclientid.sc_netid,
4943                                                 sizeof(setclientid.sc_netid));
4944         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4945                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4946                                 clp->cl_ipaddr, port >> 8, port & 255);
4947
4948         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4949                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4950                 setclientid.sc_name_len, setclientid.sc_name);
4951         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4952         trace_nfs4_setclientid(clp, status);
4953         dprintk("NFS reply setclientid: %d\n", status);
4954         return status;
4955 }
4956
4957 /**
4958  * nfs4_proc_setclientid_confirm - Confirm client ID
4959  * @clp: state data structure
4960  * @res: result of a previous SETCLIENTID
4961  * @cred: RPC credential to use for this call
4962  *
4963  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4964  */
4965 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4966                 struct nfs4_setclientid_res *arg,
4967                 struct rpc_cred *cred)
4968 {
4969         struct rpc_message msg = {
4970                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4971                 .rpc_argp = arg,
4972                 .rpc_cred = cred,
4973         };
4974         int status;
4975
4976         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4977                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4978                 clp->cl_clientid);
4979         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4980         trace_nfs4_setclientid_confirm(clp, status);
4981         dprintk("NFS reply setclientid_confirm: %d\n", status);
4982         return status;
4983 }
4984
4985 struct nfs4_delegreturndata {
4986         struct nfs4_delegreturnargs args;
4987         struct nfs4_delegreturnres res;
4988         struct nfs_fh fh;
4989         nfs4_stateid stateid;
4990         unsigned long timestamp;
4991         struct nfs_fattr fattr;
4992         int rpc_status;
4993 };
4994
4995 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4996 {
4997         struct nfs4_delegreturndata *data = calldata;
4998
4999         if (!nfs4_sequence_done(task, &data->res.seq_res))
5000                 return;
5001
5002         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5003         switch (task->tk_status) {
5004         case 0:
5005                 renew_lease(data->res.server, data->timestamp);
5006                 break;
5007         case -NFS4ERR_ADMIN_REVOKED:
5008         case -NFS4ERR_DELEG_REVOKED:
5009         case -NFS4ERR_BAD_STATEID:
5010         case -NFS4ERR_OLD_STATEID:
5011         case -NFS4ERR_STALE_STATEID:
5012         case -NFS4ERR_EXPIRED:
5013                 task->tk_status = 0;
5014                 break;
5015         default:
5016                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5017                                 -EAGAIN) {
5018                         rpc_restart_call_prepare(task);
5019                         return;
5020                 }
5021         }
5022         data->rpc_status = task->tk_status;
5023 }
5024
5025 static void nfs4_delegreturn_release(void *calldata)
5026 {
5027         kfree(calldata);
5028 }
5029
5030 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5031 {
5032         struct nfs4_delegreturndata *d_data;
5033
5034         d_data = (struct nfs4_delegreturndata *)data;
5035
5036         nfs4_setup_sequence(d_data->res.server,
5037                         &d_data->args.seq_args,
5038                         &d_data->res.seq_res,
5039                         task);
5040 }
5041
5042 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5043         .rpc_call_prepare = nfs4_delegreturn_prepare,
5044         .rpc_call_done = nfs4_delegreturn_done,
5045         .rpc_release = nfs4_delegreturn_release,
5046 };
5047
5048 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5049 {
5050         struct nfs4_delegreturndata *data;
5051         struct nfs_server *server = NFS_SERVER(inode);
5052         struct rpc_task *task;
5053         struct rpc_message msg = {
5054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5055                 .rpc_cred = cred,
5056         };
5057         struct rpc_task_setup task_setup_data = {
5058                 .rpc_client = server->client,
5059                 .rpc_message = &msg,
5060                 .callback_ops = &nfs4_delegreturn_ops,
5061                 .flags = RPC_TASK_ASYNC,
5062         };
5063         int status = 0;
5064
5065         data = kzalloc(sizeof(*data), GFP_NOFS);
5066         if (data == NULL)
5067                 return -ENOMEM;
5068         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5069         data->args.fhandle = &data->fh;
5070         data->args.stateid = &data->stateid;
5071         data->args.bitmask = server->cache_consistency_bitmask;
5072         nfs_copy_fh(&data->fh, NFS_FH(inode));
5073         nfs4_stateid_copy(&data->stateid, stateid);
5074         data->res.fattr = &data->fattr;
5075         data->res.server = server;
5076         nfs_fattr_init(data->res.fattr);
5077         data->timestamp = jiffies;
5078         data->rpc_status = 0;
5079
5080         task_setup_data.callback_data = data;
5081         msg.rpc_argp = &data->args;
5082         msg.rpc_resp = &data->res;
5083         task = rpc_run_task(&task_setup_data);
5084         if (IS_ERR(task))
5085                 return PTR_ERR(task);
5086         if (!issync)
5087                 goto out;
5088         status = nfs4_wait_for_completion_rpc_task(task);
5089         if (status != 0)
5090                 goto out;
5091         status = data->rpc_status;
5092         if (status == 0)
5093                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5094         else
5095                 nfs_refresh_inode(inode, &data->fattr);
5096 out:
5097         rpc_put_task(task);
5098         return status;
5099 }
5100
5101 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5102 {
5103         struct nfs_server *server = NFS_SERVER(inode);
5104         struct nfs4_exception exception = { };
5105         int err;
5106         do {
5107                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5108                 trace_nfs4_delegreturn(inode, err);
5109                 switch (err) {
5110                         case -NFS4ERR_STALE_STATEID:
5111                         case -NFS4ERR_EXPIRED:
5112                         case 0:
5113                                 return 0;
5114                 }
5115                 err = nfs4_handle_exception(server, err, &exception);
5116         } while (exception.retry);
5117         return err;
5118 }
5119
5120 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5121 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5122
5123 /*
5124  * sleep, with exponential backoff, and retry the LOCK operation.
5125  */
5126 static unsigned long
5127 nfs4_set_lock_task_retry(unsigned long timeout)
5128 {
5129         freezable_schedule_timeout_killable_unsafe(timeout);
5130         timeout <<= 1;
5131         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5132                 return NFS4_LOCK_MAXTIMEOUT;
5133         return timeout;
5134 }
5135
5136 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5137 {
5138         struct inode *inode = state->inode;
5139         struct nfs_server *server = NFS_SERVER(inode);
5140         struct nfs_client *clp = server->nfs_client;
5141         struct nfs_lockt_args arg = {
5142                 .fh = NFS_FH(inode),
5143                 .fl = request,
5144         };
5145         struct nfs_lockt_res res = {
5146                 .denied = request,
5147         };
5148         struct rpc_message msg = {
5149                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5150                 .rpc_argp       = &arg,
5151                 .rpc_resp       = &res,
5152                 .rpc_cred       = state->owner->so_cred,
5153         };
5154         struct nfs4_lock_state *lsp;
5155         int status;
5156
5157         arg.lock_owner.clientid = clp->cl_clientid;
5158         status = nfs4_set_lock_state(state, request);
5159         if (status != 0)
5160                 goto out;
5161         lsp = request->fl_u.nfs4_fl.owner;
5162         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5163         arg.lock_owner.s_dev = server->s_dev;
5164         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5165         switch (status) {
5166                 case 0:
5167                         request->fl_type = F_UNLCK;
5168                         break;
5169                 case -NFS4ERR_DENIED:
5170                         status = 0;
5171         }
5172         request->fl_ops->fl_release_private(request);
5173         request->fl_ops = NULL;
5174 out:
5175         return status;
5176 }
5177
5178 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5179 {
5180         struct nfs4_exception exception = { };
5181         int err;
5182
5183         do {
5184                 err = _nfs4_proc_getlk(state, cmd, request);
5185                 trace_nfs4_get_lock(request, state, cmd, err);
5186                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5187                                 &exception);
5188         } while (exception.retry);
5189         return err;
5190 }
5191
5192 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5193 {
5194         int res = 0;
5195         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5196                 case FL_POSIX:
5197                         res = posix_lock_file_wait(file, fl);
5198                         break;
5199                 case FL_FLOCK:
5200                         res = flock_lock_file_wait(file, fl);
5201                         break;
5202                 default:
5203                         BUG();
5204         }
5205         return res;
5206 }
5207
5208 struct nfs4_unlockdata {
5209         struct nfs_locku_args arg;
5210         struct nfs_locku_res res;
5211         struct nfs4_lock_state *lsp;
5212         struct nfs_open_context *ctx;
5213         struct file_lock fl;
5214         const struct nfs_server *server;
5215         unsigned long timestamp;
5216 };
5217
5218 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5219                 struct nfs_open_context *ctx,
5220                 struct nfs4_lock_state *lsp,
5221                 struct nfs_seqid *seqid)
5222 {
5223         struct nfs4_unlockdata *p;
5224         struct inode *inode = lsp->ls_state->inode;
5225
5226         p = kzalloc(sizeof(*p), GFP_NOFS);
5227         if (p == NULL)
5228                 return NULL;
5229         p->arg.fh = NFS_FH(inode);
5230         p->arg.fl = &p->fl;
5231         p->arg.seqid = seqid;
5232         p->res.seqid = seqid;
5233         p->arg.stateid = &lsp->ls_stateid;
5234         p->lsp = lsp;
5235         atomic_inc(&lsp->ls_count);
5236         /* Ensure we don't close file until we're done freeing locks! */
5237         p->ctx = get_nfs_open_context(ctx);
5238         memcpy(&p->fl, fl, sizeof(p->fl));
5239         p->server = NFS_SERVER(inode);
5240         return p;
5241 }
5242
5243 static void nfs4_locku_release_calldata(void *data)
5244 {
5245         struct nfs4_unlockdata *calldata = data;
5246         nfs_free_seqid(calldata->arg.seqid);
5247         nfs4_put_lock_state(calldata->lsp);
5248         put_nfs_open_context(calldata->ctx);
5249         kfree(calldata);
5250 }
5251
5252 static void nfs4_locku_done(struct rpc_task *task, void *data)
5253 {
5254         struct nfs4_unlockdata *calldata = data;
5255
5256         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5257                 return;
5258         switch (task->tk_status) {
5259                 case 0:
5260                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5261                                         &calldata->res.stateid);
5262                         renew_lease(calldata->server, calldata->timestamp);
5263                         break;
5264                 case -NFS4ERR_BAD_STATEID:
5265                 case -NFS4ERR_OLD_STATEID:
5266                 case -NFS4ERR_STALE_STATEID:
5267                 case -NFS4ERR_EXPIRED:
5268                         break;
5269                 default:
5270                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5271                                 rpc_restart_call_prepare(task);
5272         }
5273         nfs_release_seqid(calldata->arg.seqid);
5274 }
5275
5276 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5277 {
5278         struct nfs4_unlockdata *calldata = data;
5279
5280         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5281                 goto out_wait;
5282         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5283                 /* Note: exit _without_ running nfs4_locku_done */
5284                 goto out_no_action;
5285         }
5286         calldata->timestamp = jiffies;
5287         if (nfs4_setup_sequence(calldata->server,
5288                                 &calldata->arg.seq_args,
5289                                 &calldata->res.seq_res,
5290                                 task) != 0)
5291                 nfs_release_seqid(calldata->arg.seqid);
5292         return;
5293 out_no_action:
5294         task->tk_action = NULL;
5295 out_wait:
5296         nfs4_sequence_done(task, &calldata->res.seq_res);
5297 }
5298
5299 static const struct rpc_call_ops nfs4_locku_ops = {
5300         .rpc_call_prepare = nfs4_locku_prepare,
5301         .rpc_call_done = nfs4_locku_done,
5302         .rpc_release = nfs4_locku_release_calldata,
5303 };
5304
5305 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5306                 struct nfs_open_context *ctx,
5307                 struct nfs4_lock_state *lsp,
5308                 struct nfs_seqid *seqid)
5309 {
5310         struct nfs4_unlockdata *data;
5311         struct rpc_message msg = {
5312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5313                 .rpc_cred = ctx->cred,
5314         };
5315         struct rpc_task_setup task_setup_data = {
5316                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5317                 .rpc_message = &msg,
5318                 .callback_ops = &nfs4_locku_ops,
5319                 .workqueue = nfsiod_workqueue,
5320                 .flags = RPC_TASK_ASYNC,
5321         };
5322
5323         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5324                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5325
5326         /* Ensure this is an unlock - when canceling a lock, the
5327          * canceled lock is passed in, and it won't be an unlock.
5328          */
5329         fl->fl_type = F_UNLCK;
5330
5331         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5332         if (data == NULL) {
5333                 nfs_free_seqid(seqid);
5334                 return ERR_PTR(-ENOMEM);
5335         }
5336
5337         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5338         msg.rpc_argp = &data->arg;
5339         msg.rpc_resp = &data->res;
5340         task_setup_data.callback_data = data;
5341         return rpc_run_task(&task_setup_data);
5342 }
5343
5344 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5345 {
5346         struct inode *inode = state->inode;
5347         struct nfs4_state_owner *sp = state->owner;
5348         struct nfs_inode *nfsi = NFS_I(inode);
5349         struct nfs_seqid *seqid;
5350         struct nfs4_lock_state *lsp;
5351         struct rpc_task *task;
5352         int status = 0;
5353         unsigned char fl_flags = request->fl_flags;
5354
5355         status = nfs4_set_lock_state(state, request);
5356         /* Unlock _before_ we do the RPC call */
5357         request->fl_flags |= FL_EXISTS;
5358         /* Exclude nfs_delegation_claim_locks() */
5359         mutex_lock(&sp->so_delegreturn_mutex);
5360         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5361         down_read(&nfsi->rwsem);
5362         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5363                 up_read(&nfsi->rwsem);
5364                 mutex_unlock(&sp->so_delegreturn_mutex);
5365                 goto out;
5366         }
5367         up_read(&nfsi->rwsem);
5368         mutex_unlock(&sp->so_delegreturn_mutex);
5369         if (status != 0)
5370                 goto out;
5371         /* Is this a delegated lock? */
5372         lsp = request->fl_u.nfs4_fl.owner;
5373         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5374                 goto out;
5375         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5376         status = -ENOMEM;
5377         if (seqid == NULL)
5378                 goto out;
5379         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5380         status = PTR_ERR(task);
5381         if (IS_ERR(task))
5382                 goto out;
5383         status = nfs4_wait_for_completion_rpc_task(task);
5384         rpc_put_task(task);
5385 out:
5386         request->fl_flags = fl_flags;
5387         trace_nfs4_unlock(request, state, F_SETLK, status);
5388         return status;
5389 }
5390
5391 struct nfs4_lockdata {
5392         struct nfs_lock_args arg;
5393         struct nfs_lock_res res;
5394         struct nfs4_lock_state *lsp;
5395         struct nfs_open_context *ctx;
5396         struct file_lock fl;
5397         unsigned long timestamp;
5398         int rpc_status;
5399         int cancelled;
5400         struct nfs_server *server;
5401 };
5402
5403 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5404                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5405                 gfp_t gfp_mask)
5406 {
5407         struct nfs4_lockdata *p;
5408         struct inode *inode = lsp->ls_state->inode;
5409         struct nfs_server *server = NFS_SERVER(inode);
5410
5411         p = kzalloc(sizeof(*p), gfp_mask);
5412         if (p == NULL)
5413                 return NULL;
5414
5415         p->arg.fh = NFS_FH(inode);
5416         p->arg.fl = &p->fl;
5417         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5418         if (p->arg.open_seqid == NULL)
5419                 goto out_free;
5420         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5421         if (p->arg.lock_seqid == NULL)
5422                 goto out_free_seqid;
5423         p->arg.lock_stateid = &lsp->ls_stateid;
5424         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5425         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5426         p->arg.lock_owner.s_dev = server->s_dev;
5427         p->res.lock_seqid = p->arg.lock_seqid;
5428         p->lsp = lsp;
5429         p->server = server;
5430         atomic_inc(&lsp->ls_count);
5431         p->ctx = get_nfs_open_context(ctx);
5432         memcpy(&p->fl, fl, sizeof(p->fl));
5433         return p;
5434 out_free_seqid:
5435         nfs_free_seqid(p->arg.open_seqid);
5436 out_free:
5437         kfree(p);
5438         return NULL;
5439 }
5440
5441 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5442 {
5443         struct nfs4_lockdata *data = calldata;
5444         struct nfs4_state *state = data->lsp->ls_state;
5445
5446         dprintk("%s: begin!\n", __func__);
5447         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5448                 goto out_wait;
5449         /* Do we need to do an open_to_lock_owner? */
5450         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5451                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5452                         goto out_release_lock_seqid;
5453                 }
5454                 data->arg.open_stateid = &state->open_stateid;
5455                 data->arg.new_lock_owner = 1;
5456                 data->res.open_seqid = data->arg.open_seqid;
5457         } else
5458                 data->arg.new_lock_owner = 0;
5459         if (!nfs4_valid_open_stateid(state)) {
5460                 data->rpc_status = -EBADF;
5461                 task->tk_action = NULL;
5462                 goto out_release_open_seqid;
5463         }
5464         data->timestamp = jiffies;
5465         if (nfs4_setup_sequence(data->server,
5466                                 &data->arg.seq_args,
5467                                 &data->res.seq_res,
5468                                 task) == 0)
5469                 return;
5470 out_release_open_seqid:
5471         nfs_release_seqid(data->arg.open_seqid);
5472 out_release_lock_seqid:
5473         nfs_release_seqid(data->arg.lock_seqid);
5474 out_wait:
5475         nfs4_sequence_done(task, &data->res.seq_res);
5476         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5477 }
5478
5479 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5480 {
5481         struct nfs4_lockdata *data = calldata;
5482
5483         dprintk("%s: begin!\n", __func__);
5484
5485         if (!nfs4_sequence_done(task, &data->res.seq_res))
5486                 return;
5487
5488         data->rpc_status = task->tk_status;
5489         if (data->arg.new_lock_owner != 0) {
5490                 if (data->rpc_status == 0)
5491                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5492                 else
5493                         goto out;
5494         }
5495         if (data->rpc_status == 0) {
5496                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5497                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5498                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5499         }
5500 out:
5501         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5502 }
5503
5504 static void nfs4_lock_release(void *calldata)
5505 {
5506         struct nfs4_lockdata *data = calldata;
5507
5508         dprintk("%s: begin!\n", __func__);
5509         nfs_free_seqid(data->arg.open_seqid);
5510         if (data->cancelled != 0) {
5511                 struct rpc_task *task;
5512                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5513                                 data->arg.lock_seqid);
5514                 if (!IS_ERR(task))
5515                         rpc_put_task_async(task);
5516                 dprintk("%s: cancelling lock!\n", __func__);
5517         } else
5518                 nfs_free_seqid(data->arg.lock_seqid);
5519         nfs4_put_lock_state(data->lsp);
5520         put_nfs_open_context(data->ctx);
5521         kfree(data);
5522         dprintk("%s: done!\n", __func__);
5523 }
5524
5525 static const struct rpc_call_ops nfs4_lock_ops = {
5526         .rpc_call_prepare = nfs4_lock_prepare,
5527         .rpc_call_done = nfs4_lock_done,
5528         .rpc_release = nfs4_lock_release,
5529 };
5530
5531 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5532 {
5533         switch (error) {
5534         case -NFS4ERR_ADMIN_REVOKED:
5535         case -NFS4ERR_BAD_STATEID:
5536                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5537                 if (new_lock_owner != 0 ||
5538                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5539                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5540                 break;
5541         case -NFS4ERR_STALE_STATEID:
5542                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5543         case -NFS4ERR_EXPIRED:
5544                 nfs4_schedule_lease_recovery(server->nfs_client);
5545         };
5546 }
5547
5548 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5549 {
5550         struct nfs4_lockdata *data;
5551         struct rpc_task *task;
5552         struct rpc_message msg = {
5553                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5554                 .rpc_cred = state->owner->so_cred,
5555         };
5556         struct rpc_task_setup task_setup_data = {
5557                 .rpc_client = NFS_CLIENT(state->inode),
5558                 .rpc_message = &msg,
5559                 .callback_ops = &nfs4_lock_ops,
5560                 .workqueue = nfsiod_workqueue,
5561                 .flags = RPC_TASK_ASYNC,
5562         };
5563         int ret;
5564
5565         dprintk("%s: begin!\n", __func__);
5566         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5567                         fl->fl_u.nfs4_fl.owner,
5568                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5569         if (data == NULL)
5570                 return -ENOMEM;
5571         if (IS_SETLKW(cmd))
5572                 data->arg.block = 1;
5573         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5574         msg.rpc_argp = &data->arg;
5575         msg.rpc_resp = &data->res;
5576         task_setup_data.callback_data = data;
5577         if (recovery_type > NFS_LOCK_NEW) {
5578                 if (recovery_type == NFS_LOCK_RECLAIM)
5579                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5580                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5581         }
5582         task = rpc_run_task(&task_setup_data);
5583         if (IS_ERR(task))
5584                 return PTR_ERR(task);
5585         ret = nfs4_wait_for_completion_rpc_task(task);
5586         if (ret == 0) {
5587                 ret = data->rpc_status;
5588                 if (ret)
5589                         nfs4_handle_setlk_error(data->server, data->lsp,
5590                                         data->arg.new_lock_owner, ret);
5591         } else
5592                 data->cancelled = 1;
5593         rpc_put_task(task);
5594         dprintk("%s: done, ret = %d!\n", __func__, ret);
5595         return ret;
5596 }
5597
5598 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5599 {
5600         struct nfs_server *server = NFS_SERVER(state->inode);
5601         struct nfs4_exception exception = {
5602                 .inode = state->inode,
5603         };
5604         int err;
5605
5606         do {
5607                 /* Cache the lock if possible... */
5608                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5609                         return 0;
5610                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5611                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5612                 if (err != -NFS4ERR_DELAY)
5613                         break;
5614                 nfs4_handle_exception(server, err, &exception);
5615         } while (exception.retry);
5616         return err;
5617 }
5618
5619 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5620 {
5621         struct nfs_server *server = NFS_SERVER(state->inode);
5622         struct nfs4_exception exception = {
5623                 .inode = state->inode,
5624         };
5625         int err;
5626
5627         err = nfs4_set_lock_state(state, request);
5628         if (err != 0)
5629                 return err;
5630         if (!recover_lost_locks) {
5631                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5632                 return 0;
5633         }
5634         do {
5635                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5636                         return 0;
5637                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5638                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5639                 switch (err) {
5640                 default:
5641                         goto out;
5642                 case -NFS4ERR_GRACE:
5643                 case -NFS4ERR_DELAY:
5644                         nfs4_handle_exception(server, err, &exception);
5645                         err = 0;
5646                 }
5647         } while (exception.retry);
5648 out:
5649         return err;
5650 }
5651
5652 #if defined(CONFIG_NFS_V4_1)
5653 /**
5654  * nfs41_check_expired_locks - possibly free a lock stateid
5655  *
5656  * @state: NFSv4 state for an inode
5657  *
5658  * Returns NFS_OK if recovery for this stateid is now finished.
5659  * Otherwise a negative NFS4ERR value is returned.
5660  */
5661 static int nfs41_check_expired_locks(struct nfs4_state *state)
5662 {
5663         int status, ret = -NFS4ERR_BAD_STATEID;
5664         struct nfs4_lock_state *lsp;
5665         struct nfs_server *server = NFS_SERVER(state->inode);
5666
5667         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5668                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5669                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5670
5671                         status = nfs41_test_stateid(server,
5672                                         &lsp->ls_stateid,
5673                                         cred);
5674                         trace_nfs4_test_lock_stateid(state, lsp, status);
5675                         if (status != NFS_OK) {
5676                                 /* Free the stateid unless the server
5677                                  * informs us the stateid is unrecognized. */
5678                                 if (status != -NFS4ERR_BAD_STATEID)
5679                                         nfs41_free_stateid(server,
5680                                                         &lsp->ls_stateid,
5681                                                         cred);
5682                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5683                                 ret = status;
5684                         }
5685                 }
5686         };
5687
5688         return ret;
5689 }
5690
5691 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5692 {
5693         int status = NFS_OK;
5694
5695         if (test_bit(LK_STATE_IN_USE, &state->flags))
5696                 status = nfs41_check_expired_locks(state);
5697         if (status != NFS_OK)
5698                 status = nfs4_lock_expired(state, request);
5699         return status;
5700 }
5701 #endif
5702
5703 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5704 {
5705         struct nfs4_state_owner *sp = state->owner;
5706         struct nfs_inode *nfsi = NFS_I(state->inode);
5707         unsigned char fl_flags = request->fl_flags;
5708         unsigned int seq;
5709         int status = -ENOLCK;
5710
5711         if ((fl_flags & FL_POSIX) &&
5712                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5713                 goto out;
5714         /* Is this a delegated open? */
5715         status = nfs4_set_lock_state(state, request);
5716         if (status != 0)
5717                 goto out;
5718         request->fl_flags |= FL_ACCESS;
5719         status = do_vfs_lock(request->fl_file, request);
5720         if (status < 0)
5721                 goto out;
5722         down_read(&nfsi->rwsem);
5723         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5724                 /* Yes: cache locks! */
5725                 /* ...but avoid races with delegation recall... */
5726                 request->fl_flags = fl_flags & ~FL_SLEEP;
5727                 status = do_vfs_lock(request->fl_file, request);
5728                 goto out_unlock;
5729         }
5730         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5731         up_read(&nfsi->rwsem);
5732         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5733         if (status != 0)
5734                 goto out;
5735         down_read(&nfsi->rwsem);
5736         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5737                 status = -NFS4ERR_DELAY;
5738                 goto out_unlock;
5739         }
5740         /* Note: we always want to sleep here! */
5741         request->fl_flags = fl_flags | FL_SLEEP;
5742         if (do_vfs_lock(request->fl_file, request) < 0)
5743                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5744                         "manager!\n", __func__);
5745 out_unlock:
5746         up_read(&nfsi->rwsem);
5747 out:
5748         request->fl_flags = fl_flags;
5749         return status;
5750 }
5751
5752 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5753 {
5754         struct nfs4_exception exception = {
5755                 .state = state,
5756                 .inode = state->inode,
5757         };
5758         int err;
5759
5760         do {
5761                 err = _nfs4_proc_setlk(state, cmd, request);
5762                 trace_nfs4_set_lock(request, state, cmd, err);
5763                 if (err == -NFS4ERR_DENIED)
5764                         err = -EAGAIN;
5765                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5766                                 err, &exception);
5767         } while (exception.retry);
5768         return err;
5769 }
5770
5771 static int
5772 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5773 {
5774         struct nfs_open_context *ctx;
5775         struct nfs4_state *state;
5776         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5777         int status;
5778
5779         /* verify open state */
5780         ctx = nfs_file_open_context(filp);
5781         state = ctx->state;
5782
5783         if (request->fl_start < 0 || request->fl_end < 0)
5784                 return -EINVAL;
5785
5786         if (IS_GETLK(cmd)) {
5787                 if (state != NULL)
5788                         return nfs4_proc_getlk(state, F_GETLK, request);
5789                 return 0;
5790         }
5791
5792         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5793                 return -EINVAL;
5794
5795         if (request->fl_type == F_UNLCK) {
5796                 if (state != NULL)
5797                         return nfs4_proc_unlck(state, cmd, request);
5798                 return 0;
5799         }
5800
5801         if (state == NULL)
5802                 return -ENOLCK;
5803         /*
5804          * Don't rely on the VFS having checked the file open mode,
5805          * since it won't do this for flock() locks.
5806          */
5807         switch (request->fl_type) {
5808         case F_RDLCK:
5809                 if (!(filp->f_mode & FMODE_READ))
5810                         return -EBADF;
5811                 break;
5812         case F_WRLCK:
5813                 if (!(filp->f_mode & FMODE_WRITE))
5814                         return -EBADF;
5815         }
5816
5817         do {
5818                 status = nfs4_proc_setlk(state, cmd, request);
5819                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5820                         break;
5821                 timeout = nfs4_set_lock_task_retry(timeout);
5822                 status = -ERESTARTSYS;
5823                 if (signalled())
5824                         break;
5825         } while(status < 0);
5826         return status;
5827 }
5828
5829 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5830 {
5831         struct nfs_server *server = NFS_SERVER(state->inode);
5832         int err;
5833
5834         err = nfs4_set_lock_state(state, fl);
5835         if (err != 0)
5836                 return err;
5837         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5838         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5839 }
5840
5841 struct nfs_release_lockowner_data {
5842         struct nfs4_lock_state *lsp;
5843         struct nfs_server *server;
5844         struct nfs_release_lockowner_args args;
5845         struct nfs_release_lockowner_res res;
5846         unsigned long timestamp;
5847 };
5848
5849 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5850 {
5851         struct nfs_release_lockowner_data *data = calldata;
5852         nfs40_setup_sequence(data->server,
5853                                 &data->args.seq_args, &data->res.seq_res, task);
5854         data->timestamp = jiffies;
5855 }
5856
5857 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5858 {
5859         struct nfs_release_lockowner_data *data = calldata;
5860         struct nfs_server *server = data->server;
5861
5862         nfs40_sequence_done(task, &data->res.seq_res);
5863
5864         switch (task->tk_status) {
5865         case 0:
5866                 renew_lease(server, data->timestamp);
5867                 break;
5868         case -NFS4ERR_STALE_CLIENTID:
5869         case -NFS4ERR_EXPIRED:
5870         case -NFS4ERR_LEASE_MOVED:
5871         case -NFS4ERR_DELAY:
5872                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5873                         rpc_restart_call_prepare(task);
5874         }
5875 }
5876
5877 static void nfs4_release_lockowner_release(void *calldata)
5878 {
5879         struct nfs_release_lockowner_data *data = calldata;
5880         nfs4_free_lock_state(data->server, data->lsp);
5881         kfree(calldata);
5882 }
5883
5884 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5885         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5886         .rpc_call_done = nfs4_release_lockowner_done,
5887         .rpc_release = nfs4_release_lockowner_release,
5888 };
5889
5890 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5891 {
5892         struct nfs_release_lockowner_data *data;
5893         struct rpc_message msg = {
5894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5895         };
5896
5897         if (server->nfs_client->cl_mvops->minor_version != 0)
5898                 return -EINVAL;
5899
5900         data = kmalloc(sizeof(*data), GFP_NOFS);
5901         if (!data)
5902                 return -ENOMEM;
5903         data->lsp = lsp;
5904         data->server = server;
5905         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5906         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5907         data->args.lock_owner.s_dev = server->s_dev;
5908
5909         msg.rpc_argp = &data->args;
5910         msg.rpc_resp = &data->res;
5911         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
5912         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5913         return 0;
5914 }
5915
5916 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5917
5918 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5919                                    const void *buf, size_t buflen,
5920                                    int flags, int type)
5921 {
5922         if (strcmp(key, "") != 0)
5923                 return -EINVAL;
5924
5925         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5926 }
5927
5928 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5929                                    void *buf, size_t buflen, int type)
5930 {
5931         if (strcmp(key, "") != 0)
5932                 return -EINVAL;
5933
5934         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5935 }
5936
5937 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5938                                        size_t list_len, const char *name,
5939                                        size_t name_len, int type)
5940 {
5941         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5942
5943         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5944                 return 0;
5945
5946         if (list && len <= list_len)
5947                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5948         return len;
5949 }
5950
5951 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5952 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5953 {
5954         return server->caps & NFS_CAP_SECURITY_LABEL;
5955 }
5956
5957 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5958                                    const void *buf, size_t buflen,
5959                                    int flags, int type)
5960 {
5961         if (security_ismaclabel(key))
5962                 return nfs4_set_security_label(dentry, buf, buflen);
5963
5964         return -EOPNOTSUPP;
5965 }
5966
5967 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5968                                    void *buf, size_t buflen, int type)
5969 {
5970         if (security_ismaclabel(key))
5971                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5972         return -EOPNOTSUPP;
5973 }
5974
5975 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5976                                        size_t list_len, const char *name,
5977                                        size_t name_len, int type)
5978 {
5979         size_t len = 0;
5980
5981         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5982                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5983                 if (list && len <= list_len)
5984                         security_inode_listsecurity(dentry->d_inode, list, len);
5985         }
5986         return len;
5987 }
5988
5989 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5990         .prefix = XATTR_SECURITY_PREFIX,
5991         .list   = nfs4_xattr_list_nfs4_label,
5992         .get    = nfs4_xattr_get_nfs4_label,
5993         .set    = nfs4_xattr_set_nfs4_label,
5994 };
5995 #endif
5996
5997
5998 /*
5999  * nfs_fhget will use either the mounted_on_fileid or the fileid
6000  */
6001 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6002 {
6003         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6004                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6005               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6006               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6007                 return;
6008
6009         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6010                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6011         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6012         fattr->nlink = 2;
6013 }
6014
6015 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6016                                    const struct qstr *name,
6017                                    struct nfs4_fs_locations *fs_locations,
6018                                    struct page *page)
6019 {
6020         struct nfs_server *server = NFS_SERVER(dir);
6021         u32 bitmask[3] = {
6022                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6023         };
6024         struct nfs4_fs_locations_arg args = {
6025                 .dir_fh = NFS_FH(dir),
6026                 .name = name,
6027                 .page = page,
6028                 .bitmask = bitmask,
6029         };
6030         struct nfs4_fs_locations_res res = {
6031                 .fs_locations = fs_locations,
6032         };
6033         struct rpc_message msg = {
6034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6035                 .rpc_argp = &args,
6036                 .rpc_resp = &res,
6037         };
6038         int status;
6039
6040         dprintk("%s: start\n", __func__);
6041
6042         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6043          * is not supported */
6044         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6045                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6046         else
6047                 bitmask[0] |= FATTR4_WORD0_FILEID;
6048
6049         nfs_fattr_init(&fs_locations->fattr);
6050         fs_locations->server = server;
6051         fs_locations->nlocations = 0;
6052         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6053         dprintk("%s: returned status = %d\n", __func__, status);
6054         return status;
6055 }
6056
6057 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6058                            const struct qstr *name,
6059                            struct nfs4_fs_locations *fs_locations,
6060                            struct page *page)
6061 {
6062         struct nfs4_exception exception = { };
6063         int err;
6064         do {
6065                 err = _nfs4_proc_fs_locations(client, dir, name,
6066                                 fs_locations, page);
6067                 trace_nfs4_get_fs_locations(dir, name, err);
6068                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6069                                 &exception);
6070         } while (exception.retry);
6071         return err;
6072 }
6073
6074 /*
6075  * This operation also signals the server that this client is
6076  * performing migration recovery.  The server can stop returning
6077  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6078  * appended to this compound to identify the client ID which is
6079  * performing recovery.
6080  */
6081 static int _nfs40_proc_get_locations(struct inode *inode,
6082                                      struct nfs4_fs_locations *locations,
6083                                      struct page *page, struct rpc_cred *cred)
6084 {
6085         struct nfs_server *server = NFS_SERVER(inode);
6086         struct rpc_clnt *clnt = server->client;
6087         u32 bitmask[2] = {
6088                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6089         };
6090         struct nfs4_fs_locations_arg args = {
6091                 .clientid       = server->nfs_client->cl_clientid,
6092                 .fh             = NFS_FH(inode),
6093                 .page           = page,
6094                 .bitmask        = bitmask,
6095                 .migration      = 1,            /* skip LOOKUP */
6096                 .renew          = 1,            /* append RENEW */
6097         };
6098         struct nfs4_fs_locations_res res = {
6099                 .fs_locations   = locations,
6100                 .migration      = 1,
6101                 .renew          = 1,
6102         };
6103         struct rpc_message msg = {
6104                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6105                 .rpc_argp       = &args,
6106                 .rpc_resp       = &res,
6107                 .rpc_cred       = cred,
6108         };
6109         unsigned long now = jiffies;
6110         int status;
6111
6112         nfs_fattr_init(&locations->fattr);
6113         locations->server = server;
6114         locations->nlocations = 0;
6115
6116         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6117         nfs4_set_sequence_privileged(&args.seq_args);
6118         status = nfs4_call_sync_sequence(clnt, server, &msg,
6119                                         &args.seq_args, &res.seq_res);
6120         if (status)
6121                 return status;
6122
6123         renew_lease(server, now);
6124         return 0;
6125 }
6126
6127 #ifdef CONFIG_NFS_V4_1
6128
6129 /*
6130  * This operation also signals the server that this client is
6131  * performing migration recovery.  The server can stop asserting
6132  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6133  * performing this operation is identified in the SEQUENCE
6134  * operation in this compound.
6135  *
6136  * When the client supports GETATTR(fs_locations_info), it can
6137  * be plumbed in here.
6138  */
6139 static int _nfs41_proc_get_locations(struct inode *inode,
6140                                      struct nfs4_fs_locations *locations,
6141                                      struct page *page, struct rpc_cred *cred)
6142 {
6143         struct nfs_server *server = NFS_SERVER(inode);
6144         struct rpc_clnt *clnt = server->client;
6145         u32 bitmask[2] = {
6146                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6147         };
6148         struct nfs4_fs_locations_arg args = {
6149                 .fh             = NFS_FH(inode),
6150                 .page           = page,
6151                 .bitmask        = bitmask,
6152                 .migration      = 1,            /* skip LOOKUP */
6153         };
6154         struct nfs4_fs_locations_res res = {
6155                 .fs_locations   = locations,
6156                 .migration      = 1,
6157         };
6158         struct rpc_message msg = {
6159                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6160                 .rpc_argp       = &args,
6161                 .rpc_resp       = &res,
6162                 .rpc_cred       = cred,
6163         };
6164         int status;
6165
6166         nfs_fattr_init(&locations->fattr);
6167         locations->server = server;
6168         locations->nlocations = 0;
6169
6170         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6171         nfs4_set_sequence_privileged(&args.seq_args);
6172         status = nfs4_call_sync_sequence(clnt, server, &msg,
6173                                         &args.seq_args, &res.seq_res);
6174         if (status == NFS4_OK &&
6175             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6176                 status = -NFS4ERR_LEASE_MOVED;
6177         return status;
6178 }
6179
6180 #endif  /* CONFIG_NFS_V4_1 */
6181
6182 /**
6183  * nfs4_proc_get_locations - discover locations for a migrated FSID
6184  * @inode: inode on FSID that is migrating
6185  * @locations: result of query
6186  * @page: buffer
6187  * @cred: credential to use for this operation
6188  *
6189  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6190  * operation failed, or a negative errno if a local error occurred.
6191  *
6192  * On success, "locations" is filled in, but if the server has
6193  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6194  * asserted.
6195  *
6196  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6197  * from this client that require migration recovery.
6198  */
6199 int nfs4_proc_get_locations(struct inode *inode,
6200                             struct nfs4_fs_locations *locations,
6201                             struct page *page, struct rpc_cred *cred)
6202 {
6203         struct nfs_server *server = NFS_SERVER(inode);
6204         struct nfs_client *clp = server->nfs_client;
6205         const struct nfs4_mig_recovery_ops *ops =
6206                                         clp->cl_mvops->mig_recovery_ops;
6207         struct nfs4_exception exception = { };
6208         int status;
6209
6210         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6211                 (unsigned long long)server->fsid.major,
6212                 (unsigned long long)server->fsid.minor,
6213                 clp->cl_hostname);
6214         nfs_display_fhandle(NFS_FH(inode), __func__);
6215
6216         do {
6217                 status = ops->get_locations(inode, locations, page, cred);
6218                 if (status != -NFS4ERR_DELAY)
6219                         break;
6220                 nfs4_handle_exception(server, status, &exception);
6221         } while (exception.retry);
6222         return status;
6223 }
6224
6225 /*
6226  * This operation also signals the server that this client is
6227  * performing "lease moved" recovery.  The server can stop
6228  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6229  * is appended to this compound to identify the client ID which is
6230  * performing recovery.
6231  */
6232 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6233 {
6234         struct nfs_server *server = NFS_SERVER(inode);
6235         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6236         struct rpc_clnt *clnt = server->client;
6237         struct nfs4_fsid_present_arg args = {
6238                 .fh             = NFS_FH(inode),
6239                 .clientid       = clp->cl_clientid,
6240                 .renew          = 1,            /* append RENEW */
6241         };
6242         struct nfs4_fsid_present_res res = {
6243                 .renew          = 1,
6244         };
6245         struct rpc_message msg = {
6246                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6247                 .rpc_argp       = &args,
6248                 .rpc_resp       = &res,
6249                 .rpc_cred       = cred,
6250         };
6251         unsigned long now = jiffies;
6252         int status;
6253
6254         res.fh = nfs_alloc_fhandle();
6255         if (res.fh == NULL)
6256                 return -ENOMEM;
6257
6258         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6259         nfs4_set_sequence_privileged(&args.seq_args);
6260         status = nfs4_call_sync_sequence(clnt, server, &msg,
6261                                                 &args.seq_args, &res.seq_res);
6262         nfs_free_fhandle(res.fh);
6263         if (status)
6264                 return status;
6265
6266         do_renew_lease(clp, now);
6267         return 0;
6268 }
6269
6270 #ifdef CONFIG_NFS_V4_1
6271
6272 /*
6273  * This operation also signals the server that this client is
6274  * performing "lease moved" recovery.  The server can stop asserting
6275  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6276  * this operation is identified in the SEQUENCE operation in this
6277  * compound.
6278  */
6279 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6280 {
6281         struct nfs_server *server = NFS_SERVER(inode);
6282         struct rpc_clnt *clnt = server->client;
6283         struct nfs4_fsid_present_arg args = {
6284                 .fh             = NFS_FH(inode),
6285         };
6286         struct nfs4_fsid_present_res res = {
6287         };
6288         struct rpc_message msg = {
6289                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6290                 .rpc_argp       = &args,
6291                 .rpc_resp       = &res,
6292                 .rpc_cred       = cred,
6293         };
6294         int status;
6295
6296         res.fh = nfs_alloc_fhandle();
6297         if (res.fh == NULL)
6298                 return -ENOMEM;
6299
6300         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6301         nfs4_set_sequence_privileged(&args.seq_args);
6302         status = nfs4_call_sync_sequence(clnt, server, &msg,
6303                                                 &args.seq_args, &res.seq_res);
6304         nfs_free_fhandle(res.fh);
6305         if (status == NFS4_OK &&
6306             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6307                 status = -NFS4ERR_LEASE_MOVED;
6308         return status;
6309 }
6310
6311 #endif  /* CONFIG_NFS_V4_1 */
6312
6313 /**
6314  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6315  * @inode: inode on FSID to check
6316  * @cred: credential to use for this operation
6317  *
6318  * Server indicates whether the FSID is present, moved, or not
6319  * recognized.  This operation is necessary to clear a LEASE_MOVED
6320  * condition for this client ID.
6321  *
6322  * Returns NFS4_OK if the FSID is present on this server,
6323  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6324  *  NFS4ERR code if some error occurred on the server, or a
6325  *  negative errno if a local failure occurred.
6326  */
6327 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6328 {
6329         struct nfs_server *server = NFS_SERVER(inode);
6330         struct nfs_client *clp = server->nfs_client;
6331         const struct nfs4_mig_recovery_ops *ops =
6332                                         clp->cl_mvops->mig_recovery_ops;
6333         struct nfs4_exception exception = { };
6334         int status;
6335
6336         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6337                 (unsigned long long)server->fsid.major,
6338                 (unsigned long long)server->fsid.minor,
6339                 clp->cl_hostname);
6340         nfs_display_fhandle(NFS_FH(inode), __func__);
6341
6342         do {
6343                 status = ops->fsid_present(inode, cred);
6344                 if (status != -NFS4ERR_DELAY)
6345                         break;
6346                 nfs4_handle_exception(server, status, &exception);
6347         } while (exception.retry);
6348         return status;
6349 }
6350
6351 /**
6352  * If 'use_integrity' is true and the state managment nfs_client
6353  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6354  * and the machine credential as per RFC3530bis and RFC5661 Security
6355  * Considerations sections. Otherwise, just use the user cred with the
6356  * filesystem's rpc_client.
6357  */
6358 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6359 {
6360         int status;
6361         struct nfs4_secinfo_arg args = {
6362                 .dir_fh = NFS_FH(dir),
6363                 .name   = name,
6364         };
6365         struct nfs4_secinfo_res res = {
6366                 .flavors     = flavors,
6367         };
6368         struct rpc_message msg = {
6369                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6370                 .rpc_argp = &args,
6371                 .rpc_resp = &res,
6372         };
6373         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6374         struct rpc_cred *cred = NULL;
6375
6376         if (use_integrity) {
6377                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6378                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6379                 msg.rpc_cred = cred;
6380         }
6381
6382         dprintk("NFS call  secinfo %s\n", name->name);
6383
6384         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6385                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6386
6387         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6388                                 &res.seq_res, 0);
6389         dprintk("NFS reply  secinfo: %d\n", status);
6390
6391         if (cred)
6392                 put_rpccred(cred);
6393
6394         return status;
6395 }
6396
6397 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6398                       struct nfs4_secinfo_flavors *flavors)
6399 {
6400         struct nfs4_exception exception = { };
6401         int err;
6402         do {
6403                 err = -NFS4ERR_WRONGSEC;
6404
6405                 /* try to use integrity protection with machine cred */
6406                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6407                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6408
6409                 /*
6410                  * if unable to use integrity protection, or SECINFO with
6411                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6412                  * disallowed by spec, but exists in deployed servers) use
6413                  * the current filesystem's rpc_client and the user cred.
6414                  */
6415                 if (err == -NFS4ERR_WRONGSEC)
6416                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6417
6418                 trace_nfs4_secinfo(dir, name, err);
6419                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6420                                 &exception);
6421         } while (exception.retry);
6422         return err;
6423 }
6424
6425 #ifdef CONFIG_NFS_V4_1
6426 /*
6427  * Check the exchange flags returned by the server for invalid flags, having
6428  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6429  * DS flags set.
6430  */
6431 static int nfs4_check_cl_exchange_flags(u32 flags)
6432 {
6433         if (flags & ~EXCHGID4_FLAG_MASK_R)
6434                 goto out_inval;
6435         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6436             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6437                 goto out_inval;
6438         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6439                 goto out_inval;
6440         return NFS_OK;
6441 out_inval:
6442         return -NFS4ERR_INVAL;
6443 }
6444
6445 static bool
6446 nfs41_same_server_scope(struct nfs41_server_scope *a,
6447                         struct nfs41_server_scope *b)
6448 {
6449         if (a->server_scope_sz == b->server_scope_sz &&
6450             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6451                 return true;
6452
6453         return false;
6454 }
6455
6456 /*
6457  * nfs4_proc_bind_conn_to_session()
6458  *
6459  * The 4.1 client currently uses the same TCP connection for the
6460  * fore and backchannel.
6461  */
6462 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6463 {
6464         int status;
6465         struct nfs41_bind_conn_to_session_res res;
6466         struct rpc_message msg = {
6467                 .rpc_proc =
6468                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6469                 .rpc_argp = clp,
6470                 .rpc_resp = &res,
6471                 .rpc_cred = cred,
6472         };
6473
6474         dprintk("--> %s\n", __func__);
6475
6476         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6477         if (unlikely(res.session == NULL)) {
6478                 status = -ENOMEM;
6479                 goto out;
6480         }
6481
6482         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6483         trace_nfs4_bind_conn_to_session(clp, status);
6484         if (status == 0) {
6485                 if (memcmp(res.session->sess_id.data,
6486                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6487                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6488                         status = -EIO;
6489                         goto out_session;
6490                 }
6491                 if (res.dir != NFS4_CDFS4_BOTH) {
6492                         dprintk("NFS: %s: Unexpected direction from server\n",
6493                                 __func__);
6494                         status = -EIO;
6495                         goto out_session;
6496                 }
6497                 if (res.use_conn_in_rdma_mode) {
6498                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6499                                 __func__);
6500                         status = -EIO;
6501                         goto out_session;
6502                 }
6503         }
6504 out_session:
6505         kfree(res.session);
6506 out:
6507         dprintk("<-- %s status= %d\n", __func__, status);
6508         return status;
6509 }
6510
6511 /*
6512  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6513  * and operations we'd like to see to enable certain features in the allow map
6514  */
6515 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6516         .how = SP4_MACH_CRED,
6517         .enforce.u.words = {
6518                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6519                       1 << (OP_EXCHANGE_ID - 32) |
6520                       1 << (OP_CREATE_SESSION - 32) |
6521                       1 << (OP_DESTROY_SESSION - 32) |
6522                       1 << (OP_DESTROY_CLIENTID - 32)
6523         },
6524         .allow.u.words = {
6525                 [0] = 1 << (OP_CLOSE) |
6526                       1 << (OP_LOCKU) |
6527                       1 << (OP_COMMIT),
6528                 [1] = 1 << (OP_SECINFO - 32) |
6529                       1 << (OP_SECINFO_NO_NAME - 32) |
6530                       1 << (OP_TEST_STATEID - 32) |
6531                       1 << (OP_FREE_STATEID - 32) |
6532                       1 << (OP_WRITE - 32)
6533         }
6534 };
6535
6536 /*
6537  * Select the state protection mode for client `clp' given the server results
6538  * from exchange_id in `sp'.
6539  *
6540  * Returns 0 on success, negative errno otherwise.
6541  */
6542 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6543                                  struct nfs41_state_protection *sp)
6544 {
6545         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6546                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6547                       1 << (OP_EXCHANGE_ID - 32) |
6548                       1 << (OP_CREATE_SESSION - 32) |
6549                       1 << (OP_DESTROY_SESSION - 32) |
6550                       1 << (OP_DESTROY_CLIENTID - 32)
6551         };
6552         unsigned int i;
6553
6554         if (sp->how == SP4_MACH_CRED) {
6555                 /* Print state protect result */
6556                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6557                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6558                         if (test_bit(i, sp->enforce.u.longs))
6559                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6560                         if (test_bit(i, sp->allow.u.longs))
6561                                 dfprintk(MOUNT, "  allow op %d\n", i);
6562                 }
6563
6564                 /* make sure nothing is on enforce list that isn't supported */
6565                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6566                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6567                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6568                                 return -EINVAL;
6569                         }
6570                 }
6571
6572                 /*
6573                  * Minimal mode - state operations are allowed to use machine
6574                  * credential.  Note this already happens by default, so the
6575                  * client doesn't have to do anything more than the negotiation.
6576                  *
6577                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6578                  *       we're already using the machine cred for exchange_id
6579                  *       and will never use a different cred.
6580                  */
6581                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6582                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6583                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6584                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6585                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6586                         dfprintk(MOUNT, "  minimal mode enabled\n");
6587                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6588                 } else {
6589                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6590                         return -EINVAL;
6591                 }
6592
6593                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6594                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6595                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6596                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6597                 }
6598
6599                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6600                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6601                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6602                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6603                 }
6604
6605                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6606                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6607                         dfprintk(MOUNT, "  stateid mode enabled\n");
6608                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6609                 }
6610
6611                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6612                         dfprintk(MOUNT, "  write mode enabled\n");
6613                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6614                 }
6615
6616                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6617                         dfprintk(MOUNT, "  commit mode enabled\n");
6618                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6619                 }
6620         }
6621
6622         return 0;
6623 }
6624
6625 /*
6626  * _nfs4_proc_exchange_id()
6627  *
6628  * Wrapper for EXCHANGE_ID operation.
6629  */
6630 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6631         u32 sp4_how)
6632 {
6633         nfs4_verifier verifier;
6634         struct nfs41_exchange_id_args args = {
6635                 .verifier = &verifier,
6636                 .client = clp,
6637 #ifdef CONFIG_NFS_V4_1_MIGRATION
6638                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6639                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6640                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6641 #else
6642                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6643                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6644 #endif
6645         };
6646         struct nfs41_exchange_id_res res = {
6647                 0
6648         };
6649         int status;
6650         struct rpc_message msg = {
6651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6652                 .rpc_argp = &args,
6653                 .rpc_resp = &res,
6654                 .rpc_cred = cred,
6655         };
6656
6657         nfs4_init_boot_verifier(clp, &verifier);
6658         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6659                                                         sizeof(args.id));
6660         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6661                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6662                 args.id_len, args.id);
6663
6664         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6665                                         GFP_NOFS);
6666         if (unlikely(res.server_owner == NULL)) {
6667                 status = -ENOMEM;
6668                 goto out;
6669         }
6670
6671         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6672                                         GFP_NOFS);
6673         if (unlikely(res.server_scope == NULL)) {
6674                 status = -ENOMEM;
6675                 goto out_server_owner;
6676         }
6677
6678         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6679         if (unlikely(res.impl_id == NULL)) {
6680                 status = -ENOMEM;
6681                 goto out_server_scope;
6682         }
6683
6684         switch (sp4_how) {
6685         case SP4_NONE:
6686                 args.state_protect.how = SP4_NONE;
6687                 break;
6688
6689         case SP4_MACH_CRED:
6690                 args.state_protect = nfs4_sp4_mach_cred_request;
6691                 break;
6692
6693         default:
6694                 /* unsupported! */
6695                 WARN_ON_ONCE(1);
6696                 status = -EINVAL;
6697                 goto out_server_scope;
6698         }
6699
6700         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6701         trace_nfs4_exchange_id(clp, status);
6702         if (status == 0)
6703                 status = nfs4_check_cl_exchange_flags(res.flags);
6704
6705         if (status == 0)
6706                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6707
6708         if (status == 0) {
6709                 clp->cl_clientid = res.clientid;
6710                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6711                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6712                         clp->cl_seqid = res.seqid;
6713
6714                 kfree(clp->cl_serverowner);
6715                 clp->cl_serverowner = res.server_owner;
6716                 res.server_owner = NULL;
6717
6718                 /* use the most recent implementation id */
6719                 kfree(clp->cl_implid);
6720                 clp->cl_implid = res.impl_id;
6721
6722                 if (clp->cl_serverscope != NULL &&
6723                     !nfs41_same_server_scope(clp->cl_serverscope,
6724                                              res.server_scope)) {
6725                         dprintk("%s: server_scope mismatch detected\n",
6726                                 __func__);
6727                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6728                         kfree(clp->cl_serverscope);
6729                         clp->cl_serverscope = NULL;
6730                 }
6731
6732                 if (clp->cl_serverscope == NULL) {
6733                         clp->cl_serverscope = res.server_scope;
6734                         goto out;
6735                 }
6736         } else
6737                 kfree(res.impl_id);
6738
6739 out_server_owner:
6740         kfree(res.server_owner);
6741 out_server_scope:
6742         kfree(res.server_scope);
6743 out:
6744         if (clp->cl_implid != NULL)
6745                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6746                         "domain: %s, name: %s, date: %llu,%u\n",
6747                         clp->cl_implid->domain, clp->cl_implid->name,
6748                         clp->cl_implid->date.seconds,
6749                         clp->cl_implid->date.nseconds);
6750         dprintk("NFS reply exchange_id: %d\n", status);
6751         return status;
6752 }
6753
6754 /*
6755  * nfs4_proc_exchange_id()
6756  *
6757  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6758  *
6759  * Since the clientid has expired, all compounds using sessions
6760  * associated with the stale clientid will be returning
6761  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6762  * be in some phase of session reset.
6763  *
6764  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6765  */
6766 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6767 {
6768         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6769         int status;
6770
6771         /* try SP4_MACH_CRED if krb5i/p */
6772         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6773             authflavor == RPC_AUTH_GSS_KRB5P) {
6774                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6775                 if (!status)
6776                         return 0;
6777         }
6778
6779         /* try SP4_NONE */
6780         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6781 }
6782
6783 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6784                 struct rpc_cred *cred)
6785 {
6786         struct rpc_message msg = {
6787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6788                 .rpc_argp = clp,
6789                 .rpc_cred = cred,
6790         };
6791         int status;
6792
6793         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6794         trace_nfs4_destroy_clientid(clp, status);
6795         if (status)
6796                 dprintk("NFS: Got error %d from the server %s on "
6797                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6798         return status;
6799 }
6800
6801 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6802                 struct rpc_cred *cred)
6803 {
6804         unsigned int loop;
6805         int ret;
6806
6807         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6808                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6809                 switch (ret) {
6810                 case -NFS4ERR_DELAY:
6811                 case -NFS4ERR_CLIENTID_BUSY:
6812                         ssleep(1);
6813                         break;
6814                 default:
6815                         return ret;
6816                 }
6817         }
6818         return 0;
6819 }
6820
6821 int nfs4_destroy_clientid(struct nfs_client *clp)
6822 {
6823         struct rpc_cred *cred;
6824         int ret = 0;
6825
6826         if (clp->cl_mvops->minor_version < 1)
6827                 goto out;
6828         if (clp->cl_exchange_flags == 0)
6829                 goto out;
6830         if (clp->cl_preserve_clid)
6831                 goto out;
6832         cred = nfs4_get_clid_cred(clp);
6833         ret = nfs4_proc_destroy_clientid(clp, cred);
6834         if (cred)
6835                 put_rpccred(cred);
6836         switch (ret) {
6837         case 0:
6838         case -NFS4ERR_STALE_CLIENTID:
6839                 clp->cl_exchange_flags = 0;
6840         }
6841 out:
6842         return ret;
6843 }
6844
6845 struct nfs4_get_lease_time_data {
6846         struct nfs4_get_lease_time_args *args;
6847         struct nfs4_get_lease_time_res *res;
6848         struct nfs_client *clp;
6849 };
6850
6851 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6852                                         void *calldata)
6853 {
6854         struct nfs4_get_lease_time_data *data =
6855                         (struct nfs4_get_lease_time_data *)calldata;
6856
6857         dprintk("--> %s\n", __func__);
6858         /* just setup sequence, do not trigger session recovery
6859            since we're invoked within one */
6860         nfs41_setup_sequence(data->clp->cl_session,
6861                         &data->args->la_seq_args,
6862                         &data->res->lr_seq_res,
6863                         task);
6864         dprintk("<-- %s\n", __func__);
6865 }
6866
6867 /*
6868  * Called from nfs4_state_manager thread for session setup, so don't recover
6869  * from sequence operation or clientid errors.
6870  */
6871 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6872 {
6873         struct nfs4_get_lease_time_data *data =
6874                         (struct nfs4_get_lease_time_data *)calldata;
6875
6876         dprintk("--> %s\n", __func__);
6877         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6878                 return;
6879         switch (task->tk_status) {
6880         case -NFS4ERR_DELAY:
6881         case -NFS4ERR_GRACE:
6882                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6883                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6884                 task->tk_status = 0;
6885                 /* fall through */
6886         case -NFS4ERR_RETRY_UNCACHED_REP:
6887                 rpc_restart_call_prepare(task);
6888                 return;
6889         }
6890         dprintk("<-- %s\n", __func__);
6891 }
6892
6893 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6894         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6895         .rpc_call_done = nfs4_get_lease_time_done,
6896 };
6897
6898 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6899 {
6900         struct rpc_task *task;
6901         struct nfs4_get_lease_time_args args;
6902         struct nfs4_get_lease_time_res res = {
6903                 .lr_fsinfo = fsinfo,
6904         };
6905         struct nfs4_get_lease_time_data data = {
6906                 .args = &args,
6907                 .res = &res,
6908                 .clp = clp,
6909         };
6910         struct rpc_message msg = {
6911                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6912                 .rpc_argp = &args,
6913                 .rpc_resp = &res,
6914         };
6915         struct rpc_task_setup task_setup = {
6916                 .rpc_client = clp->cl_rpcclient,
6917                 .rpc_message = &msg,
6918                 .callback_ops = &nfs4_get_lease_time_ops,
6919                 .callback_data = &data,
6920                 .flags = RPC_TASK_TIMEOUT,
6921         };
6922         int status;
6923
6924         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6925         nfs4_set_sequence_privileged(&args.la_seq_args);
6926         dprintk("--> %s\n", __func__);
6927         task = rpc_run_task(&task_setup);
6928
6929         if (IS_ERR(task))
6930                 status = PTR_ERR(task);
6931         else {
6932                 status = task->tk_status;
6933                 rpc_put_task(task);
6934         }
6935         dprintk("<-- %s return %d\n", __func__, status);
6936
6937         return status;
6938 }
6939
6940 /*
6941  * Initialize the values to be used by the client in CREATE_SESSION
6942  * If nfs4_init_session set the fore channel request and response sizes,
6943  * use them.
6944  *
6945  * Set the back channel max_resp_sz_cached to zero to force the client to
6946  * always set csa_cachethis to FALSE because the current implementation
6947  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6948  */
6949 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6950 {
6951         unsigned int max_rqst_sz, max_resp_sz;
6952
6953         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6954         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6955
6956         /* Fore channel attributes */
6957         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6958         args->fc_attrs.max_resp_sz = max_resp_sz;
6959         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6960         args->fc_attrs.max_reqs = max_session_slots;
6961
6962         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6963                 "max_ops=%u max_reqs=%u\n",
6964                 __func__,
6965                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6966                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6967
6968         /* Back channel attributes */
6969         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6970         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6971         args->bc_attrs.max_resp_sz_cached = 0;
6972         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6973         args->bc_attrs.max_reqs = 1;
6974
6975         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6976                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6977                 __func__,
6978                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6979                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6980                 args->bc_attrs.max_reqs);
6981 }
6982
6983 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6984 {
6985         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6986         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6987
6988         if (rcvd->max_resp_sz > sent->max_resp_sz)
6989                 return -EINVAL;
6990         /*
6991          * Our requested max_ops is the minimum we need; we're not
6992          * prepared to break up compounds into smaller pieces than that.
6993          * So, no point even trying to continue if the server won't
6994          * cooperate:
6995          */
6996         if (rcvd->max_ops < sent->max_ops)
6997                 return -EINVAL;
6998         if (rcvd->max_reqs == 0)
6999                 return -EINVAL;
7000         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7001                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7002         return 0;
7003 }
7004
7005 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7006 {
7007         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7008         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7009
7010         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7011                 return -EINVAL;
7012         if (rcvd->max_resp_sz < sent->max_resp_sz)
7013                 return -EINVAL;
7014         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7015                 return -EINVAL;
7016         /* These would render the backchannel useless: */
7017         if (rcvd->max_ops != sent->max_ops)
7018                 return -EINVAL;
7019         if (rcvd->max_reqs != sent->max_reqs)
7020                 return -EINVAL;
7021         return 0;
7022 }
7023
7024 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7025                                      struct nfs4_session *session)
7026 {
7027         int ret;
7028
7029         ret = nfs4_verify_fore_channel_attrs(args, session);
7030         if (ret)
7031                 return ret;
7032         return nfs4_verify_back_channel_attrs(args, session);
7033 }
7034
7035 static int _nfs4_proc_create_session(struct nfs_client *clp,
7036                 struct rpc_cred *cred)
7037 {
7038         struct nfs4_session *session = clp->cl_session;
7039         struct nfs41_create_session_args args = {
7040                 .client = clp,
7041                 .cb_program = NFS4_CALLBACK,
7042         };
7043         struct nfs41_create_session_res res = {
7044                 .client = clp,
7045         };
7046         struct rpc_message msg = {
7047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7048                 .rpc_argp = &args,
7049                 .rpc_resp = &res,
7050                 .rpc_cred = cred,
7051         };
7052         int status;
7053
7054         nfs4_init_channel_attrs(&args);
7055         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7056
7057         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7058         trace_nfs4_create_session(clp, status);
7059
7060         if (!status) {
7061                 /* Verify the session's negotiated channel_attrs values */
7062                 status = nfs4_verify_channel_attrs(&args, session);
7063                 /* Increment the clientid slot sequence id */
7064                 clp->cl_seqid++;
7065         }
7066
7067         return status;
7068 }
7069
7070 /*
7071  * Issues a CREATE_SESSION operation to the server.
7072  * It is the responsibility of the caller to verify the session is
7073  * expired before calling this routine.
7074  */
7075 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7076 {
7077         int status;
7078         unsigned *ptr;
7079         struct nfs4_session *session = clp->cl_session;
7080
7081         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7082
7083         status = _nfs4_proc_create_session(clp, cred);
7084         if (status)
7085                 goto out;
7086
7087         /* Init or reset the session slot tables */
7088         status = nfs4_setup_session_slot_tables(session);
7089         dprintk("slot table setup returned %d\n", status);
7090         if (status)
7091                 goto out;
7092
7093         ptr = (unsigned *)&session->sess_id.data[0];
7094         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7095                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7096 out:
7097         dprintk("<-- %s\n", __func__);
7098         return status;
7099 }
7100
7101 /*
7102  * Issue the over-the-wire RPC DESTROY_SESSION.
7103  * The caller must serialize access to this routine.
7104  */
7105 int nfs4_proc_destroy_session(struct nfs4_session *session,
7106                 struct rpc_cred *cred)
7107 {
7108         struct rpc_message msg = {
7109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7110                 .rpc_argp = session,
7111                 .rpc_cred = cred,
7112         };
7113         int status = 0;
7114
7115         dprintk("--> nfs4_proc_destroy_session\n");
7116
7117         /* session is still being setup */
7118         if (session->clp->cl_cons_state != NFS_CS_READY)
7119                 return status;
7120
7121         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7122         trace_nfs4_destroy_session(session->clp, status);
7123
7124         if (status)
7125                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7126                         "Session has been destroyed regardless...\n", status);
7127
7128         dprintk("<-- nfs4_proc_destroy_session\n");
7129         return status;
7130 }
7131
7132 /*
7133  * Renew the cl_session lease.
7134  */
7135 struct nfs4_sequence_data {
7136         struct nfs_client *clp;
7137         struct nfs4_sequence_args args;
7138         struct nfs4_sequence_res res;
7139 };
7140
7141 static void nfs41_sequence_release(void *data)
7142 {
7143         struct nfs4_sequence_data *calldata = data;
7144         struct nfs_client *clp = calldata->clp;
7145
7146         if (atomic_read(&clp->cl_count) > 1)
7147                 nfs4_schedule_state_renewal(clp);
7148         nfs_put_client(clp);
7149         kfree(calldata);
7150 }
7151
7152 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7153 {
7154         switch(task->tk_status) {
7155         case -NFS4ERR_DELAY:
7156                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7157                 return -EAGAIN;
7158         default:
7159                 nfs4_schedule_lease_recovery(clp);
7160         }
7161         return 0;
7162 }
7163
7164 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7165 {
7166         struct nfs4_sequence_data *calldata = data;
7167         struct nfs_client *clp = calldata->clp;
7168
7169         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7170                 return;
7171
7172         trace_nfs4_sequence(clp, task->tk_status);
7173         if (task->tk_status < 0) {
7174                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7175                 if (atomic_read(&clp->cl_count) == 1)
7176                         goto out;
7177
7178                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7179                         rpc_restart_call_prepare(task);
7180                         return;
7181                 }
7182         }
7183         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7184 out:
7185         dprintk("<-- %s\n", __func__);
7186 }
7187
7188 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7189 {
7190         struct nfs4_sequence_data *calldata = data;
7191         struct nfs_client *clp = calldata->clp;
7192         struct nfs4_sequence_args *args;
7193         struct nfs4_sequence_res *res;
7194
7195         args = task->tk_msg.rpc_argp;
7196         res = task->tk_msg.rpc_resp;
7197
7198         nfs41_setup_sequence(clp->cl_session, args, res, task);
7199 }
7200
7201 static const struct rpc_call_ops nfs41_sequence_ops = {
7202         .rpc_call_done = nfs41_sequence_call_done,
7203         .rpc_call_prepare = nfs41_sequence_prepare,
7204         .rpc_release = nfs41_sequence_release,
7205 };
7206
7207 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7208                 struct rpc_cred *cred,
7209                 bool is_privileged)
7210 {
7211         struct nfs4_sequence_data *calldata;
7212         struct rpc_message msg = {
7213                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7214                 .rpc_cred = cred,
7215         };
7216         struct rpc_task_setup task_setup_data = {
7217                 .rpc_client = clp->cl_rpcclient,
7218                 .rpc_message = &msg,
7219                 .callback_ops = &nfs41_sequence_ops,
7220                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7221         };
7222
7223         if (!atomic_inc_not_zero(&clp->cl_count))
7224                 return ERR_PTR(-EIO);
7225         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7226         if (calldata == NULL) {
7227                 nfs_put_client(clp);
7228                 return ERR_PTR(-ENOMEM);
7229         }
7230         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7231         if (is_privileged)
7232                 nfs4_set_sequence_privileged(&calldata->args);
7233         msg.rpc_argp = &calldata->args;
7234         msg.rpc_resp = &calldata->res;
7235         calldata->clp = clp;
7236         task_setup_data.callback_data = calldata;
7237
7238         return rpc_run_task(&task_setup_data);
7239 }
7240
7241 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7242 {
7243         struct rpc_task *task;
7244         int ret = 0;
7245
7246         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7247                 return 0;
7248         task = _nfs41_proc_sequence(clp, cred, false);
7249         if (IS_ERR(task))
7250                 ret = PTR_ERR(task);
7251         else
7252                 rpc_put_task_async(task);
7253         dprintk("<-- %s status=%d\n", __func__, ret);
7254         return ret;
7255 }
7256
7257 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7258 {
7259         struct rpc_task *task;
7260         int ret;
7261
7262         task = _nfs41_proc_sequence(clp, cred, true);
7263         if (IS_ERR(task)) {
7264                 ret = PTR_ERR(task);
7265                 goto out;
7266         }
7267         ret = rpc_wait_for_completion_task(task);
7268         if (!ret) {
7269                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7270
7271                 if (task->tk_status == 0)
7272                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7273                 ret = task->tk_status;
7274         }
7275         rpc_put_task(task);
7276 out:
7277         dprintk("<-- %s status=%d\n", __func__, ret);
7278         return ret;
7279 }
7280
7281 struct nfs4_reclaim_complete_data {
7282         struct nfs_client *clp;
7283         struct nfs41_reclaim_complete_args arg;
7284         struct nfs41_reclaim_complete_res res;
7285 };
7286
7287 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7288 {
7289         struct nfs4_reclaim_complete_data *calldata = data;
7290
7291         nfs41_setup_sequence(calldata->clp->cl_session,
7292                         &calldata->arg.seq_args,
7293                         &calldata->res.seq_res,
7294                         task);
7295 }
7296
7297 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7298 {
7299         switch(task->tk_status) {
7300         case 0:
7301         case -NFS4ERR_COMPLETE_ALREADY:
7302         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7303                 break;
7304         case -NFS4ERR_DELAY:
7305                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7306                 /* fall through */
7307         case -NFS4ERR_RETRY_UNCACHED_REP:
7308                 return -EAGAIN;
7309         default:
7310                 nfs4_schedule_lease_recovery(clp);
7311         }
7312         return 0;
7313 }
7314
7315 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7316 {
7317         struct nfs4_reclaim_complete_data *calldata = data;
7318         struct nfs_client *clp = calldata->clp;
7319         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7320
7321         dprintk("--> %s\n", __func__);
7322         if (!nfs41_sequence_done(task, res))
7323                 return;
7324
7325         trace_nfs4_reclaim_complete(clp, task->tk_status);
7326         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7327                 rpc_restart_call_prepare(task);
7328                 return;
7329         }
7330         dprintk("<-- %s\n", __func__);
7331 }
7332
7333 static void nfs4_free_reclaim_complete_data(void *data)
7334 {
7335         struct nfs4_reclaim_complete_data *calldata = data;
7336
7337         kfree(calldata);
7338 }
7339
7340 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7341         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7342         .rpc_call_done = nfs4_reclaim_complete_done,
7343         .rpc_release = nfs4_free_reclaim_complete_data,
7344 };
7345
7346 /*
7347  * Issue a global reclaim complete.
7348  */
7349 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7350                 struct rpc_cred *cred)
7351 {
7352         struct nfs4_reclaim_complete_data *calldata;
7353         struct rpc_task *task;
7354         struct rpc_message msg = {
7355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7356                 .rpc_cred = cred,
7357         };
7358         struct rpc_task_setup task_setup_data = {
7359                 .rpc_client = clp->cl_rpcclient,
7360                 .rpc_message = &msg,
7361                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7362                 .flags = RPC_TASK_ASYNC,
7363         };
7364         int status = -ENOMEM;
7365
7366         dprintk("--> %s\n", __func__);
7367         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7368         if (calldata == NULL)
7369                 goto out;
7370         calldata->clp = clp;
7371         calldata->arg.one_fs = 0;
7372
7373         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7374         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7375         msg.rpc_argp = &calldata->arg;
7376         msg.rpc_resp = &calldata->res;
7377         task_setup_data.callback_data = calldata;
7378         task = rpc_run_task(&task_setup_data);
7379         if (IS_ERR(task)) {
7380                 status = PTR_ERR(task);
7381                 goto out;
7382         }
7383         status = nfs4_wait_for_completion_rpc_task(task);
7384         if (status == 0)
7385                 status = task->tk_status;
7386         rpc_put_task(task);
7387         return 0;
7388 out:
7389         dprintk("<-- %s status=%d\n", __func__, status);
7390         return status;
7391 }
7392
7393 static void
7394 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7395 {
7396         struct nfs4_layoutget *lgp = calldata;
7397         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7398         struct nfs4_session *session = nfs4_get_session(server);
7399
7400         dprintk("--> %s\n", __func__);
7401         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7402          * right now covering the LAYOUTGET we are about to send.
7403          * However, that is not so catastrophic, and there seems
7404          * to be no way to prevent it completely.
7405          */
7406         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7407                                 &lgp->res.seq_res, task))
7408                 return;
7409         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7410                                           NFS_I(lgp->args.inode)->layout,
7411                                           lgp->args.ctx->state)) {
7412                 rpc_exit(task, NFS4_OK);
7413         }
7414 }
7415
7416 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7417 {
7418         struct nfs4_layoutget *lgp = calldata;
7419         struct inode *inode = lgp->args.inode;
7420         struct nfs_server *server = NFS_SERVER(inode);
7421         struct pnfs_layout_hdr *lo;
7422         struct nfs4_state *state = NULL;
7423         unsigned long timeo, now, giveup;
7424
7425         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7426
7427         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7428                 goto out;
7429
7430         switch (task->tk_status) {
7431         case 0:
7432                 goto out;
7433         /*
7434          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7435          * (or clients) writing to the same RAID stripe
7436          */
7437         case -NFS4ERR_LAYOUTTRYLATER:
7438         /*
7439          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7440          * existing layout before getting a new one).
7441          */
7442         case -NFS4ERR_RECALLCONFLICT:
7443                 timeo = rpc_get_timeout(task->tk_client);
7444                 giveup = lgp->args.timestamp + timeo;
7445                 now = jiffies;
7446                 if (time_after(giveup, now)) {
7447                         unsigned long delay;
7448
7449                         /* Delay for:
7450                          * - Not less then NFS4_POLL_RETRY_MIN.
7451                          * - One last time a jiffie before we give up
7452                          * - exponential backoff (time_now minus start_attempt)
7453                          */
7454                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7455                                     min((giveup - now - 1),
7456                                         now - lgp->args.timestamp));
7457
7458                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7459                                 __func__, delay);
7460                         rpc_delay(task, delay);
7461                         task->tk_status = 0;
7462                         rpc_restart_call_prepare(task);
7463                         goto out; /* Do not call nfs4_async_handle_error() */
7464                 }
7465                 break;
7466         case -NFS4ERR_EXPIRED:
7467         case -NFS4ERR_BAD_STATEID:
7468                 spin_lock(&inode->i_lock);
7469                 lo = NFS_I(inode)->layout;
7470                 if (!lo || list_empty(&lo->plh_segs)) {
7471                         spin_unlock(&inode->i_lock);
7472                         /* If the open stateid was bad, then recover it. */
7473                         state = lgp->args.ctx->state;
7474                 } else {
7475                         LIST_HEAD(head);
7476
7477                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7478                         spin_unlock(&inode->i_lock);
7479                         /* Mark the bad layout state as invalid, then
7480                          * retry using the open stateid. */
7481                         pnfs_free_lseg_list(&head);
7482                 }
7483         }
7484         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7485                 rpc_restart_call_prepare(task);
7486 out:
7487         dprintk("<-- %s\n", __func__);
7488 }
7489
7490 static size_t max_response_pages(struct nfs_server *server)
7491 {
7492         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7493         return nfs_page_array_len(0, max_resp_sz);
7494 }
7495
7496 static void nfs4_free_pages(struct page **pages, size_t size)
7497 {
7498         int i;
7499
7500         if (!pages)
7501                 return;
7502
7503         for (i = 0; i < size; i++) {
7504                 if (!pages[i])
7505                         break;
7506                 __free_page(pages[i]);
7507         }
7508         kfree(pages);
7509 }
7510
7511 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7512 {
7513         struct page **pages;
7514         int i;
7515
7516         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7517         if (!pages) {
7518                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7519                 return NULL;
7520         }
7521
7522         for (i = 0; i < size; i++) {
7523                 pages[i] = alloc_page(gfp_flags);
7524                 if (!pages[i]) {
7525                         dprintk("%s: failed to allocate page\n", __func__);
7526                         nfs4_free_pages(pages, size);
7527                         return NULL;
7528                 }
7529         }
7530
7531         return pages;
7532 }
7533
7534 static void nfs4_layoutget_release(void *calldata)
7535 {
7536         struct nfs4_layoutget *lgp = calldata;
7537         struct inode *inode = lgp->args.inode;
7538         struct nfs_server *server = NFS_SERVER(inode);
7539         size_t max_pages = max_response_pages(server);
7540
7541         dprintk("--> %s\n", __func__);
7542         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7543         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7544         put_nfs_open_context(lgp->args.ctx);
7545         kfree(calldata);
7546         dprintk("<-- %s\n", __func__);
7547 }
7548
7549 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7550         .rpc_call_prepare = nfs4_layoutget_prepare,
7551         .rpc_call_done = nfs4_layoutget_done,
7552         .rpc_release = nfs4_layoutget_release,
7553 };
7554
7555 struct pnfs_layout_segment *
7556 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7557 {
7558         struct inode *inode = lgp->args.inode;
7559         struct nfs_server *server = NFS_SERVER(inode);
7560         size_t max_pages = max_response_pages(server);
7561         struct rpc_task *task;
7562         struct rpc_message msg = {
7563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7564                 .rpc_argp = &lgp->args,
7565                 .rpc_resp = &lgp->res,
7566                 .rpc_cred = lgp->cred,
7567         };
7568         struct rpc_task_setup task_setup_data = {
7569                 .rpc_client = server->client,
7570                 .rpc_message = &msg,
7571                 .callback_ops = &nfs4_layoutget_call_ops,
7572                 .callback_data = lgp,
7573                 .flags = RPC_TASK_ASYNC,
7574         };
7575         struct pnfs_layout_segment *lseg = NULL;
7576         int status = 0;
7577
7578         dprintk("--> %s\n", __func__);
7579
7580         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7581         if (!lgp->args.layout.pages) {
7582                 nfs4_layoutget_release(lgp);
7583                 return ERR_PTR(-ENOMEM);
7584         }
7585         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7586         lgp->args.timestamp = jiffies;
7587
7588         lgp->res.layoutp = &lgp->args.layout;
7589         lgp->res.seq_res.sr_slot = NULL;
7590         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7591
7592         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7593         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7594
7595         task = rpc_run_task(&task_setup_data);
7596         if (IS_ERR(task))
7597                 return ERR_CAST(task);
7598         status = nfs4_wait_for_completion_rpc_task(task);
7599         if (status == 0)
7600                 status = task->tk_status;
7601         trace_nfs4_layoutget(lgp->args.ctx,
7602                         &lgp->args.range,
7603                         &lgp->res.range,
7604                         status);
7605         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7606         if (status == 0 && lgp->res.layoutp->len)
7607                 lseg = pnfs_layout_process(lgp);
7608         rpc_put_task(task);
7609         dprintk("<-- %s status=%d\n", __func__, status);
7610         if (status)
7611                 return ERR_PTR(status);
7612         return lseg;
7613 }
7614
7615 static void
7616 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7617 {
7618         struct nfs4_layoutreturn *lrp = calldata;
7619
7620         dprintk("--> %s\n", __func__);
7621         nfs41_setup_sequence(lrp->clp->cl_session,
7622                         &lrp->args.seq_args,
7623                         &lrp->res.seq_res,
7624                         task);
7625 }
7626
7627 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7628 {
7629         struct nfs4_layoutreturn *lrp = calldata;
7630         struct nfs_server *server;
7631
7632         dprintk("--> %s\n", __func__);
7633
7634         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7635                 return;
7636
7637         server = NFS_SERVER(lrp->args.inode);
7638         switch (task->tk_status) {
7639         default:
7640                 task->tk_status = 0;
7641         case 0:
7642                 break;
7643         case -NFS4ERR_DELAY:
7644                 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
7645                         break;
7646                 rpc_restart_call_prepare(task);
7647                 return;
7648         }
7649         dprintk("<-- %s\n", __func__);
7650 }
7651
7652 static void nfs4_layoutreturn_release(void *calldata)
7653 {
7654         struct nfs4_layoutreturn *lrp = calldata;
7655         struct pnfs_layout_hdr *lo = lrp->args.layout;
7656
7657         dprintk("--> %s\n", __func__);
7658         spin_lock(&lo->plh_inode->i_lock);
7659         if (lrp->res.lrs_present)
7660                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7661         lo->plh_block_lgets--;
7662         spin_unlock(&lo->plh_inode->i_lock);
7663         pnfs_put_layout_hdr(lrp->args.layout);
7664         kfree(calldata);
7665         dprintk("<-- %s\n", __func__);
7666 }
7667
7668 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7669         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7670         .rpc_call_done = nfs4_layoutreturn_done,
7671         .rpc_release = nfs4_layoutreturn_release,
7672 };
7673
7674 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7675 {
7676         struct rpc_task *task;
7677         struct rpc_message msg = {
7678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7679                 .rpc_argp = &lrp->args,
7680                 .rpc_resp = &lrp->res,
7681                 .rpc_cred = lrp->cred,
7682         };
7683         struct rpc_task_setup task_setup_data = {
7684                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7685                 .rpc_message = &msg,
7686                 .callback_ops = &nfs4_layoutreturn_call_ops,
7687                 .callback_data = lrp,
7688         };
7689         int status;
7690
7691         dprintk("--> %s\n", __func__);
7692         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7693         task = rpc_run_task(&task_setup_data);
7694         if (IS_ERR(task))
7695                 return PTR_ERR(task);
7696         status = task->tk_status;
7697         trace_nfs4_layoutreturn(lrp->args.inode, status);
7698         dprintk("<-- %s status=%d\n", __func__, status);
7699         rpc_put_task(task);
7700         return status;
7701 }
7702
7703 /*
7704  * Retrieve the list of Data Server devices from the MDS.
7705  */
7706 static int _nfs4_getdevicelist(struct nfs_server *server,
7707                                     const struct nfs_fh *fh,
7708                                     struct pnfs_devicelist *devlist)
7709 {
7710         struct nfs4_getdevicelist_args args = {
7711                 .fh = fh,
7712                 .layoutclass = server->pnfs_curr_ld->id,
7713         };
7714         struct nfs4_getdevicelist_res res = {
7715                 .devlist = devlist,
7716         };
7717         struct rpc_message msg = {
7718                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7719                 .rpc_argp = &args,
7720                 .rpc_resp = &res,
7721         };
7722         int status;
7723
7724         dprintk("--> %s\n", __func__);
7725         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7726                                 &res.seq_res, 0);
7727         dprintk("<-- %s status=%d\n", __func__, status);
7728         return status;
7729 }
7730
7731 int nfs4_proc_getdevicelist(struct nfs_server *server,
7732                             const struct nfs_fh *fh,
7733                             struct pnfs_devicelist *devlist)
7734 {
7735         struct nfs4_exception exception = { };
7736         int err;
7737
7738         do {
7739                 err = nfs4_handle_exception(server,
7740                                 _nfs4_getdevicelist(server, fh, devlist),
7741                                 &exception);
7742         } while (exception.retry);
7743
7744         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7745                 err, devlist->num_devs);
7746
7747         return err;
7748 }
7749 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7750
7751 static int
7752 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7753                 struct pnfs_device *pdev,
7754                 struct rpc_cred *cred)
7755 {
7756         struct nfs4_getdeviceinfo_args args = {
7757                 .pdev = pdev,
7758         };
7759         struct nfs4_getdeviceinfo_res res = {
7760                 .pdev = pdev,
7761         };
7762         struct rpc_message msg = {
7763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7764                 .rpc_argp = &args,
7765                 .rpc_resp = &res,
7766                 .rpc_cred = cred,
7767         };
7768         int status;
7769
7770         dprintk("--> %s\n", __func__);
7771         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7772         dprintk("<-- %s status=%d\n", __func__, status);
7773
7774         return status;
7775 }
7776
7777 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7778                 struct pnfs_device *pdev,
7779                 struct rpc_cred *cred)
7780 {
7781         struct nfs4_exception exception = { };
7782         int err;
7783
7784         do {
7785                 err = nfs4_handle_exception(server,
7786                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7787                                         &exception);
7788         } while (exception.retry);
7789         return err;
7790 }
7791 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7792
7793 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7794 {
7795         struct nfs4_layoutcommit_data *data = calldata;
7796         struct nfs_server *server = NFS_SERVER(data->args.inode);
7797         struct nfs4_session *session = nfs4_get_session(server);
7798
7799         nfs41_setup_sequence(session,
7800                         &data->args.seq_args,
7801                         &data->res.seq_res,
7802                         task);
7803 }
7804
7805 static void
7806 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7807 {
7808         struct nfs4_layoutcommit_data *data = calldata;
7809         struct nfs_server *server = NFS_SERVER(data->args.inode);
7810
7811         if (!nfs41_sequence_done(task, &data->res.seq_res))
7812                 return;
7813
7814         switch (task->tk_status) { /* Just ignore these failures */
7815         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7816         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7817         case -NFS4ERR_BADLAYOUT:     /* no layout */
7818         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7819                 task->tk_status = 0;
7820         case 0:
7821                 break;
7822         default:
7823                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7824                         rpc_restart_call_prepare(task);
7825                         return;
7826                 }
7827         }
7828 }
7829
7830 static void nfs4_layoutcommit_release(void *calldata)
7831 {
7832         struct nfs4_layoutcommit_data *data = calldata;
7833
7834         pnfs_cleanup_layoutcommit(data);
7835         nfs_post_op_update_inode_force_wcc(data->args.inode,
7836                                            data->res.fattr);
7837         put_rpccred(data->cred);
7838         kfree(data);
7839 }
7840
7841 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7842         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7843         .rpc_call_done = nfs4_layoutcommit_done,
7844         .rpc_release = nfs4_layoutcommit_release,
7845 };
7846
7847 int
7848 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7849 {
7850         struct rpc_message msg = {
7851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7852                 .rpc_argp = &data->args,
7853                 .rpc_resp = &data->res,
7854                 .rpc_cred = data->cred,
7855         };
7856         struct rpc_task_setup task_setup_data = {
7857                 .task = &data->task,
7858                 .rpc_client = NFS_CLIENT(data->args.inode),
7859                 .rpc_message = &msg,
7860                 .callback_ops = &nfs4_layoutcommit_ops,
7861                 .callback_data = data,
7862                 .flags = RPC_TASK_ASYNC,
7863         };
7864         struct rpc_task *task;
7865         int status = 0;
7866
7867         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7868                 "lbw: %llu inode %lu\n",
7869                 data->task.tk_pid, sync,
7870                 data->args.lastbytewritten,
7871                 data->args.inode->i_ino);
7872
7873         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7874         task = rpc_run_task(&task_setup_data);
7875         if (IS_ERR(task))
7876                 return PTR_ERR(task);
7877         if (sync == false)
7878                 goto out;
7879         status = nfs4_wait_for_completion_rpc_task(task);
7880         if (status != 0)
7881                 goto out;
7882         status = task->tk_status;
7883         trace_nfs4_layoutcommit(data->args.inode, status);
7884 out:
7885         dprintk("%s: status %d\n", __func__, status);
7886         rpc_put_task(task);
7887         return status;
7888 }
7889
7890 /**
7891  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7892  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7893  */
7894 static int
7895 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7896                     struct nfs_fsinfo *info,
7897                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7898 {
7899         struct nfs41_secinfo_no_name_args args = {
7900                 .style = SECINFO_STYLE_CURRENT_FH,
7901         };
7902         struct nfs4_secinfo_res res = {
7903                 .flavors = flavors,
7904         };
7905         struct rpc_message msg = {
7906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7907                 .rpc_argp = &args,
7908                 .rpc_resp = &res,
7909         };
7910         struct rpc_clnt *clnt = server->client;
7911         struct rpc_cred *cred = NULL;
7912         int status;
7913
7914         if (use_integrity) {
7915                 clnt = server->nfs_client->cl_rpcclient;
7916                 cred = nfs4_get_clid_cred(server->nfs_client);
7917                 msg.rpc_cred = cred;
7918         }
7919
7920         dprintk("--> %s\n", __func__);
7921         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7922                                 &res.seq_res, 0);
7923         dprintk("<-- %s status=%d\n", __func__, status);
7924
7925         if (cred)
7926                 put_rpccred(cred);
7927
7928         return status;
7929 }
7930
7931 static int
7932 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7933                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7934 {
7935         struct nfs4_exception exception = { };
7936         int err;
7937         do {
7938                 /* first try using integrity protection */
7939                 err = -NFS4ERR_WRONGSEC;
7940
7941                 /* try to use integrity protection with machine cred */
7942                 if (_nfs4_is_integrity_protected(server->nfs_client))
7943                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7944                                                           flavors, true);
7945
7946                 /*
7947                  * if unable to use integrity protection, or SECINFO with
7948                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7949                  * disallowed by spec, but exists in deployed servers) use
7950                  * the current filesystem's rpc_client and the user cred.
7951                  */
7952                 if (err == -NFS4ERR_WRONGSEC)
7953                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7954                                                           flavors, false);
7955
7956                 switch (err) {
7957                 case 0:
7958                 case -NFS4ERR_WRONGSEC:
7959                 case -ENOTSUPP:
7960                         goto out;
7961                 default:
7962                         err = nfs4_handle_exception(server, err, &exception);
7963                 }
7964         } while (exception.retry);
7965 out:
7966         return err;
7967 }
7968
7969 static int
7970 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7971                     struct nfs_fsinfo *info)
7972 {
7973         int err;
7974         struct page *page;
7975         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7976         struct nfs4_secinfo_flavors *flavors;
7977         struct nfs4_secinfo4 *secinfo;
7978         int i;
7979
7980         page = alloc_page(GFP_KERNEL);
7981         if (!page) {
7982                 err = -ENOMEM;
7983                 goto out;
7984         }
7985
7986         flavors = page_address(page);
7987         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7988
7989         /*
7990          * Fall back on "guess and check" method if
7991          * the server doesn't support SECINFO_NO_NAME
7992          */
7993         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
7994                 err = nfs4_find_root_sec(server, fhandle, info);
7995                 goto out_freepage;
7996         }
7997         if (err)
7998                 goto out_freepage;
7999
8000         for (i = 0; i < flavors->num_flavors; i++) {
8001                 secinfo = &flavors->flavors[i];
8002
8003                 switch (secinfo->flavor) {
8004                 case RPC_AUTH_NULL:
8005                 case RPC_AUTH_UNIX:
8006                 case RPC_AUTH_GSS:
8007                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8008                                         &secinfo->flavor_info);
8009                         break;
8010                 default:
8011                         flavor = RPC_AUTH_MAXFLAVOR;
8012                         break;
8013                 }
8014
8015                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8016                         flavor = RPC_AUTH_MAXFLAVOR;
8017
8018                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8019                         err = nfs4_lookup_root_sec(server, fhandle,
8020                                                    info, flavor);
8021                         if (!err)
8022                                 break;
8023                 }
8024         }
8025
8026         if (flavor == RPC_AUTH_MAXFLAVOR)
8027                 err = -EPERM;
8028
8029 out_freepage:
8030         put_page(page);
8031         if (err == -EACCES)
8032                 return -EPERM;
8033 out:
8034         return err;
8035 }
8036
8037 static int _nfs41_test_stateid(struct nfs_server *server,
8038                 nfs4_stateid *stateid,
8039                 struct rpc_cred *cred)
8040 {
8041         int status;
8042         struct nfs41_test_stateid_args args = {
8043                 .stateid = stateid,
8044         };
8045         struct nfs41_test_stateid_res res;
8046         struct rpc_message msg = {
8047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8048                 .rpc_argp = &args,
8049                 .rpc_resp = &res,
8050                 .rpc_cred = cred,
8051         };
8052         struct rpc_clnt *rpc_client = server->client;
8053
8054         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8055                 &rpc_client, &msg);
8056
8057         dprintk("NFS call  test_stateid %p\n", stateid);
8058         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8059         nfs4_set_sequence_privileged(&args.seq_args);
8060         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8061                         &args.seq_args, &res.seq_res);
8062         if (status != NFS_OK) {
8063                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8064                 return status;
8065         }
8066         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8067         return -res.status;
8068 }
8069
8070 /**
8071  * nfs41_test_stateid - perform a TEST_STATEID operation
8072  *
8073  * @server: server / transport on which to perform the operation
8074  * @stateid: state ID to test
8075  * @cred: credential
8076  *
8077  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8078  * Otherwise a negative NFS4ERR value is returned if the operation
8079  * failed or the state ID is not currently valid.
8080  */
8081 static int nfs41_test_stateid(struct nfs_server *server,
8082                 nfs4_stateid *stateid,
8083                 struct rpc_cred *cred)
8084 {
8085         struct nfs4_exception exception = { };
8086         int err;
8087         do {
8088                 err = _nfs41_test_stateid(server, stateid, cred);
8089                 if (err != -NFS4ERR_DELAY)
8090                         break;
8091                 nfs4_handle_exception(server, err, &exception);
8092         } while (exception.retry);
8093         return err;
8094 }
8095
8096 struct nfs_free_stateid_data {
8097         struct nfs_server *server;
8098         struct nfs41_free_stateid_args args;
8099         struct nfs41_free_stateid_res res;
8100 };
8101
8102 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8103 {
8104         struct nfs_free_stateid_data *data = calldata;
8105         nfs41_setup_sequence(nfs4_get_session(data->server),
8106                         &data->args.seq_args,
8107                         &data->res.seq_res,
8108                         task);
8109 }
8110
8111 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8112 {
8113         struct nfs_free_stateid_data *data = calldata;
8114
8115         nfs41_sequence_done(task, &data->res.seq_res);
8116
8117         switch (task->tk_status) {
8118         case -NFS4ERR_DELAY:
8119                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8120                         rpc_restart_call_prepare(task);
8121         }
8122 }
8123
8124 static void nfs41_free_stateid_release(void *calldata)
8125 {
8126         kfree(calldata);
8127 }
8128
8129 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8130         .rpc_call_prepare = nfs41_free_stateid_prepare,
8131         .rpc_call_done = nfs41_free_stateid_done,
8132         .rpc_release = nfs41_free_stateid_release,
8133 };
8134
8135 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8136                 nfs4_stateid *stateid,
8137                 struct rpc_cred *cred,
8138                 bool privileged)
8139 {
8140         struct rpc_message msg = {
8141                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8142                 .rpc_cred = cred,
8143         };
8144         struct rpc_task_setup task_setup = {
8145                 .rpc_client = server->client,
8146                 .rpc_message = &msg,
8147                 .callback_ops = &nfs41_free_stateid_ops,
8148                 .flags = RPC_TASK_ASYNC,
8149         };
8150         struct nfs_free_stateid_data *data;
8151
8152         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8153                 &task_setup.rpc_client, &msg);
8154
8155         dprintk("NFS call  free_stateid %p\n", stateid);
8156         data = kmalloc(sizeof(*data), GFP_NOFS);
8157         if (!data)
8158                 return ERR_PTR(-ENOMEM);
8159         data->server = server;
8160         nfs4_stateid_copy(&data->args.stateid, stateid);
8161
8162         task_setup.callback_data = data;
8163
8164         msg.rpc_argp = &data->args;
8165         msg.rpc_resp = &data->res;
8166         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8167         if (privileged)
8168                 nfs4_set_sequence_privileged(&data->args.seq_args);
8169
8170         return rpc_run_task(&task_setup);
8171 }
8172
8173 /**
8174  * nfs41_free_stateid - perform a FREE_STATEID operation
8175  *
8176  * @server: server / transport on which to perform the operation
8177  * @stateid: state ID to release
8178  * @cred: credential
8179  *
8180  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8181  * negative NFS4ERR value is returned.
8182  */
8183 static int nfs41_free_stateid(struct nfs_server *server,
8184                 nfs4_stateid *stateid,
8185                 struct rpc_cred *cred)
8186 {
8187         struct rpc_task *task;
8188         int ret;
8189
8190         task = _nfs41_free_stateid(server, stateid, cred, true);
8191         if (IS_ERR(task))
8192                 return PTR_ERR(task);
8193         ret = rpc_wait_for_completion_task(task);
8194         if (!ret)
8195                 ret = task->tk_status;
8196         rpc_put_task(task);
8197         return ret;
8198 }
8199
8200 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8201 {
8202         struct rpc_task *task;
8203         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8204
8205         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8206         nfs4_free_lock_state(server, lsp);
8207         if (IS_ERR(task))
8208                 return PTR_ERR(task);
8209         rpc_put_task(task);
8210         return 0;
8211 }
8212
8213 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8214                 const nfs4_stateid *s2)
8215 {
8216         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8217                 return false;
8218
8219         if (s1->seqid == s2->seqid)
8220                 return true;
8221         if (s1->seqid == 0 || s2->seqid == 0)
8222                 return true;
8223
8224         return false;
8225 }
8226
8227 #endif /* CONFIG_NFS_V4_1 */
8228
8229 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8230                 const nfs4_stateid *s2)
8231 {
8232         return nfs4_stateid_match(s1, s2);
8233 }
8234
8235
8236 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8237         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8238         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8239         .recover_open   = nfs4_open_reclaim,
8240         .recover_lock   = nfs4_lock_reclaim,
8241         .establish_clid = nfs4_init_clientid,
8242         .detect_trunking = nfs40_discover_server_trunking,
8243 };
8244
8245 #if defined(CONFIG_NFS_V4_1)
8246 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8247         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8248         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8249         .recover_open   = nfs4_open_reclaim,
8250         .recover_lock   = nfs4_lock_reclaim,
8251         .establish_clid = nfs41_init_clientid,
8252         .reclaim_complete = nfs41_proc_reclaim_complete,
8253         .detect_trunking = nfs41_discover_server_trunking,
8254 };
8255 #endif /* CONFIG_NFS_V4_1 */
8256
8257 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8258         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8259         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8260         .recover_open   = nfs4_open_expired,
8261         .recover_lock   = nfs4_lock_expired,
8262         .establish_clid = nfs4_init_clientid,
8263 };
8264
8265 #if defined(CONFIG_NFS_V4_1)
8266 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8267         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8268         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8269         .recover_open   = nfs41_open_expired,
8270         .recover_lock   = nfs41_lock_expired,
8271         .establish_clid = nfs41_init_clientid,
8272 };
8273 #endif /* CONFIG_NFS_V4_1 */
8274
8275 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8276         .sched_state_renewal = nfs4_proc_async_renew,
8277         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8278         .renew_lease = nfs4_proc_renew,
8279 };
8280
8281 #if defined(CONFIG_NFS_V4_1)
8282 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8283         .sched_state_renewal = nfs41_proc_async_sequence,
8284         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8285         .renew_lease = nfs4_proc_sequence,
8286 };
8287 #endif
8288
8289 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8290         .get_locations = _nfs40_proc_get_locations,
8291         .fsid_present = _nfs40_proc_fsid_present,
8292 };
8293
8294 #if defined(CONFIG_NFS_V4_1)
8295 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8296         .get_locations = _nfs41_proc_get_locations,
8297         .fsid_present = _nfs41_proc_fsid_present,
8298 };
8299 #endif  /* CONFIG_NFS_V4_1 */
8300
8301 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8302         .minor_version = 0,
8303         .init_caps = NFS_CAP_READDIRPLUS
8304                 | NFS_CAP_ATOMIC_OPEN
8305                 | NFS_CAP_CHANGE_ATTR
8306                 | NFS_CAP_POSIX_LOCK,
8307         .init_client = nfs40_init_client,
8308         .shutdown_client = nfs40_shutdown_client,
8309         .match_stateid = nfs4_match_stateid,
8310         .find_root_sec = nfs4_find_root_sec,
8311         .free_lock_state = nfs4_release_lockowner,
8312         .call_sync_ops = &nfs40_call_sync_ops,
8313         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8314         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8315         .state_renewal_ops = &nfs40_state_renewal_ops,
8316         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8317 };
8318
8319 #if defined(CONFIG_NFS_V4_1)
8320 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8321         .minor_version = 1,
8322         .init_caps = NFS_CAP_READDIRPLUS
8323                 | NFS_CAP_ATOMIC_OPEN
8324                 | NFS_CAP_CHANGE_ATTR
8325                 | NFS_CAP_POSIX_LOCK
8326                 | NFS_CAP_STATEID_NFSV41
8327                 | NFS_CAP_ATOMIC_OPEN_V1,
8328         .init_client = nfs41_init_client,
8329         .shutdown_client = nfs41_shutdown_client,
8330         .match_stateid = nfs41_match_stateid,
8331         .find_root_sec = nfs41_find_root_sec,
8332         .free_lock_state = nfs41_free_lock_state,
8333         .call_sync_ops = &nfs41_call_sync_ops,
8334         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8335         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8336         .state_renewal_ops = &nfs41_state_renewal_ops,
8337         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8338 };
8339 #endif
8340
8341 #if defined(CONFIG_NFS_V4_2)
8342 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8343         .minor_version = 2,
8344         .init_caps = NFS_CAP_READDIRPLUS
8345                 | NFS_CAP_ATOMIC_OPEN
8346                 | NFS_CAP_CHANGE_ATTR
8347                 | NFS_CAP_POSIX_LOCK
8348                 | NFS_CAP_STATEID_NFSV41
8349                 | NFS_CAP_ATOMIC_OPEN_V1,
8350         .init_client = nfs41_init_client,
8351         .shutdown_client = nfs41_shutdown_client,
8352         .match_stateid = nfs41_match_stateid,
8353         .find_root_sec = nfs41_find_root_sec,
8354         .free_lock_state = nfs41_free_lock_state,
8355         .call_sync_ops = &nfs41_call_sync_ops,
8356         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8357         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8358         .state_renewal_ops = &nfs41_state_renewal_ops,
8359 };
8360 #endif
8361
8362 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8363         [0] = &nfs_v4_0_minor_ops,
8364 #if defined(CONFIG_NFS_V4_1)
8365         [1] = &nfs_v4_1_minor_ops,
8366 #endif
8367 #if defined(CONFIG_NFS_V4_2)
8368         [2] = &nfs_v4_2_minor_ops,
8369 #endif
8370 };
8371
8372 static const struct inode_operations nfs4_dir_inode_operations = {
8373         .create         = nfs_create,
8374         .lookup         = nfs_lookup,
8375         .atomic_open    = nfs_atomic_open,
8376         .link           = nfs_link,
8377         .unlink         = nfs_unlink,
8378         .symlink        = nfs_symlink,
8379         .mkdir          = nfs_mkdir,
8380         .rmdir          = nfs_rmdir,
8381         .mknod          = nfs_mknod,
8382         .rename         = nfs_rename,
8383         .permission     = nfs_permission,
8384         .getattr        = nfs_getattr,
8385         .setattr        = nfs_setattr,
8386         .getxattr       = generic_getxattr,
8387         .setxattr       = generic_setxattr,
8388         .listxattr      = generic_listxattr,
8389         .removexattr    = generic_removexattr,
8390 };
8391
8392 static const struct inode_operations nfs4_file_inode_operations = {
8393         .permission     = nfs_permission,
8394         .getattr        = nfs_getattr,
8395         .setattr        = nfs_setattr,
8396         .getxattr       = generic_getxattr,
8397         .setxattr       = generic_setxattr,
8398         .listxattr      = generic_listxattr,
8399         .removexattr    = generic_removexattr,
8400 };
8401
8402 const struct nfs_rpc_ops nfs_v4_clientops = {
8403         .version        = 4,                    /* protocol version */
8404         .dentry_ops     = &nfs4_dentry_operations,
8405         .dir_inode_ops  = &nfs4_dir_inode_operations,
8406         .file_inode_ops = &nfs4_file_inode_operations,
8407         .file_ops       = &nfs4_file_operations,
8408         .getroot        = nfs4_proc_get_root,
8409         .submount       = nfs4_submount,
8410         .try_mount      = nfs4_try_mount,
8411         .getattr        = nfs4_proc_getattr,
8412         .setattr        = nfs4_proc_setattr,
8413         .lookup         = nfs4_proc_lookup,
8414         .access         = nfs4_proc_access,
8415         .readlink       = nfs4_proc_readlink,
8416         .create         = nfs4_proc_create,
8417         .remove         = nfs4_proc_remove,
8418         .unlink_setup   = nfs4_proc_unlink_setup,
8419         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8420         .unlink_done    = nfs4_proc_unlink_done,
8421         .rename_setup   = nfs4_proc_rename_setup,
8422         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8423         .rename_done    = nfs4_proc_rename_done,
8424         .link           = nfs4_proc_link,
8425         .symlink        = nfs4_proc_symlink,
8426         .mkdir          = nfs4_proc_mkdir,
8427         .rmdir          = nfs4_proc_remove,
8428         .readdir        = nfs4_proc_readdir,
8429         .mknod          = nfs4_proc_mknod,
8430         .statfs         = nfs4_proc_statfs,
8431         .fsinfo         = nfs4_proc_fsinfo,
8432         .pathconf       = nfs4_proc_pathconf,
8433         .set_capabilities = nfs4_server_capabilities,
8434         .decode_dirent  = nfs4_decode_dirent,
8435         .read_setup     = nfs4_proc_read_setup,
8436         .read_pageio_init = pnfs_pageio_init_read,
8437         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8438         .read_done      = nfs4_read_done,
8439         .write_setup    = nfs4_proc_write_setup,
8440         .write_pageio_init = pnfs_pageio_init_write,
8441         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8442         .write_done     = nfs4_write_done,
8443         .commit_setup   = nfs4_proc_commit_setup,
8444         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8445         .commit_done    = nfs4_commit_done,
8446         .lock           = nfs4_proc_lock,
8447         .clear_acl_cache = nfs4_zap_acl_attr,
8448         .close_context  = nfs4_close_context,
8449         .open_context   = nfs4_atomic_open,
8450         .have_delegation = nfs4_have_delegation,
8451         .return_delegation = nfs4_inode_return_delegation,
8452         .alloc_client   = nfs4_alloc_client,
8453         .init_client    = nfs4_init_client,
8454         .free_client    = nfs4_free_client,
8455         .create_server  = nfs4_create_server,
8456         .clone_server   = nfs_clone_server,
8457 };
8458
8459 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8460         .prefix = XATTR_NAME_NFSV4_ACL,
8461         .list   = nfs4_xattr_list_nfs4_acl,
8462         .get    = nfs4_xattr_get_nfs4_acl,
8463         .set    = nfs4_xattr_set_nfs4_acl,
8464 };
8465
8466 const struct xattr_handler *nfs4_xattr_handlers[] = {
8467         &nfs4_xattr_nfs4_acl_handler,
8468 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8469         &nfs4_xattr_nfs4_label_handler,
8470 #endif
8471         NULL
8472 };
8473
8474 /*
8475  * Local variables:
8476  *  c-basic-offset: 8
8477  * End:
8478  */