fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_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 long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 348 {
 349         struct nfs_client *clp = server->nfs_client;
 350         struct nfs4_state *state = exception->state;
 351         struct inode *inode = exception->inode;
 352         int ret = errorcode;
 353
 354         exception->retry = 0;
 355         switch(errorcode) {
 356                 case 0:
 357                         return 0;
 358                 case -NFS4ERR_OPENMODE:
 359                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 360                                 nfs4_inode_return_delegation(inode);
 361                                 exception->retry = 1;
 362                                 return 0;
 363                         }
 364                         if (state == NULL)
 365                                 break;
 366                         ret = nfs4_schedule_stateid_recovery(server, state);
 367                         if (ret < 0)
 368                                 break;
 369                         goto wait_on_recovery;
 370                 case -NFS4ERR_DELEG_REVOKED:
 371                 case -NFS4ERR_ADMIN_REVOKED:
 372                 case -NFS4ERR_BAD_STATEID:
 373                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 374                                 nfs_remove_bad_delegation(inode);
 375                                 exception->retry = 1;
 376                                 break;
 377                         }
 378                         if (state == NULL)
 379                                 break;
 380                         ret = nfs4_schedule_stateid_recovery(server, state);
 381                         if (ret < 0)
 382                                 break;
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_EXPIRED:
 385                         if (state != NULL) {
 386                                 ret = nfs4_schedule_stateid_recovery(server, state);
 387                                 if (ret < 0)
 388                                         break;
 389                         }
 390                 case -NFS4ERR_STALE_STATEID:
 391                 case -NFS4ERR_STALE_CLIENTID:
 392                         nfs4_schedule_lease_recovery(clp);
 393                         goto wait_on_recovery;
 394                 case -NFS4ERR_MOVED:
 395                         ret = nfs4_schedule_migration_recovery(server);
 396                         if (ret < 0)
 397                                 break;
 398                         goto wait_on_recovery;
 399                 case -NFS4ERR_LEASE_MOVED:
 400                         nfs4_schedule_lease_moved_recovery(clp);
 401                         goto wait_on_recovery;
 402 #if defined(CONFIG_NFS_V4_1)
 403                 case -NFS4ERR_BADSESSION:
 404                 case -NFS4ERR_BADSLOT:
 405                 case -NFS4ERR_BAD_HIGH_SLOT:
 406                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 407                 case -NFS4ERR_DEADSESSION:
 408                 case -NFS4ERR_SEQ_FALSE_RETRY:
 409                 case -NFS4ERR_SEQ_MISORDERED:
 410                         dprintk("%s ERROR: %d Reset session\n", __func__,
 411                                 errorcode);
 412                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 413                         goto wait_on_recovery;
 414 #endif /* defined(CONFIG_NFS_V4_1) */
 415                 case -NFS4ERR_FILE_OPEN:
 416                         if (exception->timeout > HZ) {
 417                                 /* We have retried a decent amount, time to
 418                                  * fail
 419                                  */
 420                                 ret = -EBUSY;
 421                                 break;
 422                         }
 423                 case -NFS4ERR_GRACE:
 424                 case -NFS4ERR_DELAY:
 425                         ret = nfs4_delay(server->client, &exception->timeout);
 426                         if (ret != 0)
 427                                 break;
 428                 case -NFS4ERR_RETRY_UNCACHED_REP:
 429                 case -NFS4ERR_OLD_STATEID:
 430                         exception->retry = 1;
 431                         break;
 432                 case -NFS4ERR_BADOWNER:
 433                         /* The following works around a Linux server bug! */
 434                 case -NFS4ERR_BADNAME:
 435                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 436                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 437                                 exception->retry = 1;
 438                                 printk(KERN_WARNING "NFS: v4 server %s "
 439                                                 "does not accept raw "
 440                                                 "uid/gids. "
 441                                                 "Reenabling the idmapper.\n",
 442                                                 server->nfs_client->cl_hostname);
 443                         }
 444         }
 445         /* We failed to handle the error */
 446         return nfs4_map_errors(ret);
 447 wait_on_recovery:
 448         ret = nfs4_wait_clnt_recover(clp);
 449         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 450                 return -EIO;
 451         if (ret == 0)
 452                 exception->retry = 1;
 453         return ret;
 454 }
 455
 456 /*
 457  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 458  * or 'false' otherwise.
 459  */
 460 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 461 {
 462         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 463
 464         if (flavor == RPC_AUTH_GSS_KRB5I ||
 465             flavor == RPC_AUTH_GSS_KRB5P)
 466                 return true;
 467
 468         return false;
 469 }
 470
 471 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 472 {
 473         spin_lock(&clp->cl_lock);
 474         if (time_before(clp->cl_last_renewal,timestamp))
 475                 clp->cl_last_renewal = timestamp;
 476         spin_unlock(&clp->cl_lock);
 477 }
 478
 479 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 480 {
 481         do_renew_lease(server->nfs_client, timestamp);
 482 }
 483
 484 struct nfs4_call_sync_data {
 485         const struct nfs_server *seq_server;
 486         struct nfs4_sequence_args *seq_args;
 487         struct nfs4_sequence_res *seq_res;
 488 };
 489
 490 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 491                                struct nfs4_sequence_res *res, int cache_reply)
 492 {
 493         args->sa_slot = NULL;
 494         args->sa_cache_this = cache_reply;
 495         args->sa_privileged = 0;
 496
 497         res->sr_slot = NULL;
 498 }
 499
 500 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 501 {
 502         args->sa_privileged = 1;
 503 }
 504
 505 static int nfs40_setup_sequence(const struct nfs_server *server,
 506                                 struct nfs4_sequence_args *args,
 507                                 struct nfs4_sequence_res *res,
 508                                 struct rpc_task *task)
 509 {
 510         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 511         struct nfs4_slot *slot;
 512
 513         /* slot already allocated? */
 514         if (res->sr_slot != NULL)
 515                 goto out_start;
 516
 517         spin_lock(&tbl->slot_tbl_lock);
 518         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 519                 goto out_sleep;
 520
 521         slot = nfs4_alloc_slot(tbl);
 522         if (IS_ERR(slot)) {
 523                 if (slot == ERR_PTR(-ENOMEM))
 524                         task->tk_timeout = HZ >> 2;
 525                 goto out_sleep;
 526         }
 527         spin_unlock(&tbl->slot_tbl_lock);
 528
 529         args->sa_slot = slot;
 530         res->sr_slot = slot;
 531
 532 out_start:
 533         rpc_call_start(task);
 534         return 0;
 535
 536 out_sleep:
 537         if (args->sa_privileged)
 538                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 539                                 NULL, RPC_PRIORITY_PRIVILEGED);
 540         else
 541                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 542         spin_unlock(&tbl->slot_tbl_lock);
 543         return -EAGAIN;
 544 }
 545
 546 static int nfs40_sequence_done(struct rpc_task *task,
 547                                struct nfs4_sequence_res *res)
 548 {
 549         struct nfs4_slot *slot = res->sr_slot;
 550         struct nfs4_slot_table *tbl;
 551
 552         if (slot == NULL)
 553                 goto out;
 554
 555         tbl = slot->table;
 556         spin_lock(&tbl->slot_tbl_lock);
 557         if (!nfs41_wake_and_assign_slot(tbl, slot))
 558                 nfs4_free_slot(tbl, slot);
 559         spin_unlock(&tbl->slot_tbl_lock);
 560
 561         res->sr_slot = NULL;
 562 out:
 563         return 1;
 564 }
 565
 566 #if defined(CONFIG_NFS_V4_1)
 567
 568 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 569 {
 570         struct nfs4_session *session;
 571         struct nfs4_slot_table *tbl;
 572         struct nfs4_slot *slot = res->sr_slot;
 573         bool send_new_highest_used_slotid = false;
 574
 575         tbl = slot->table;
 576         session = tbl->session;
 577
 578         spin_lock(&tbl->slot_tbl_lock);
 579         /* Be nice to the server: try to ensure that the last transmitted
 580          * value for highest_user_slotid <= target_highest_slotid
 581          */
 582         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 583                 send_new_highest_used_slotid = true;
 584
 585         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 586                 send_new_highest_used_slotid = false;
 587                 goto out_unlock;
 588         }
 589         nfs4_free_slot(tbl, slot);
 590
 591         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 592                 send_new_highest_used_slotid = false;
 593 out_unlock:
 594         spin_unlock(&tbl->slot_tbl_lock);
 595         res->sr_slot = NULL;
 596         if (send_new_highest_used_slotid)
 597                 nfs41_server_notify_highest_slotid_update(session->clp);
 598 }
 599
 600 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 601 {
 602         struct nfs4_session *session;
 603         struct nfs4_slot *slot = res->sr_slot;
 604         struct nfs_client *clp;
 605         bool interrupted = false;
 606         int ret = 1;
 607
 608         if (slot == NULL)
 609                 goto out_noaction;
 610         /* don't increment the sequence number if the task wasn't sent */
 611         if (!RPC_WAS_SENT(task))
 612                 goto out;
 613
 614         session = slot->table->session;
 615
 616         if (slot->interrupted) {
 617                 slot->interrupted = 0;
 618                 interrupted = true;
 619         }
 620
 621         trace_nfs4_sequence_done(session, res);
 622         /* Check the SEQUENCE operation status */
 623         switch (res->sr_status) {
 624         case 0:
 625                 /* Update the slot's sequence and clientid lease timer */
 626                 ++slot->seq_nr;
 627                 clp = session->clp;
 628                 do_renew_lease(clp, res->sr_timestamp);
 629                 /* Check sequence flags */
 630                 if (res->sr_status_flags != 0)
 631                         nfs4_schedule_lease_recovery(clp);
 632                 nfs41_update_target_slotid(slot->table, slot, res);
 633                 break;
 634         case 1:
 635                 /*
 636                  * sr_status remains 1 if an RPC level error occurred.
 637                  * The server may or may not have processed the sequence
 638                  * operation..
 639                  * Mark the slot as having hosted an interrupted RPC call.
 640                  */
 641                 slot->interrupted = 1;
 642                 goto out;
 643         case -NFS4ERR_DELAY:
 644                 /* The server detected a resend of the RPC call and
 645                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 646                  * of RFC5661.
 647                  */
 648                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 649                         __func__,
 650                         slot->slot_nr,
 651                         slot->seq_nr);
 652                 goto out_retry;
 653         case -NFS4ERR_BADSLOT:
 654                 /*
 655                  * The slot id we used was probably retired. Try again
 656                  * using a different slot id.
 657                  */
 658                 goto retry_nowait;
 659         case -NFS4ERR_SEQ_MISORDERED:
 660                 /*
 661                  * Was the last operation on this sequence interrupted?
 662                  * If so, retry after bumping the sequence number.
 663                  */
 664                 if (interrupted) {
 665                         ++slot->seq_nr;
 666                         goto retry_nowait;
 667                 }
 668                 /*
 669                  * Could this slot have been previously retired?
 670                  * If so, then the server may be expecting seq_nr = 1!
 671                  */
 672                 if (slot->seq_nr != 1) {
 673                         slot->seq_nr = 1;
 674                         goto retry_nowait;
 675                 }
 676                 break;
 677         case -NFS4ERR_SEQ_FALSE_RETRY:
 678                 ++slot->seq_nr;
 679                 goto retry_nowait;
 680         default:
 681                 /* Just update the slot sequence no. */
 682                 ++slot->seq_nr;
 683         }
 684 out:
 685         /* The session may be reset by one of the error handlers. */
 686         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 687         nfs41_sequence_free_slot(res);
 688 out_noaction:
 689         return ret;
 690 retry_nowait:
 691         if (rpc_restart_call_prepare(task)) {
 692                 task->tk_status = 0;
 693                 ret = 0;
 694         }
 695         goto out;
 696 out_retry:
 697         if (!rpc_restart_call(task))
 698                 goto out;
 699         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 700         return 0;
 701 }
 702 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 703
 704 static int nfs4_sequence_done(struct rpc_task *task,
 705                                struct nfs4_sequence_res *res)
 706 {
 707         if (res->sr_slot == NULL)
 708                 return 1;
 709         if (!res->sr_slot->table->session)
 710                 return nfs40_sequence_done(task, res);
 711         return nfs41_sequence_done(task, res);
 712 }
 713
 714 int nfs41_setup_sequence(struct nfs4_session *session,
 715                                 struct nfs4_sequence_args *args,
 716                                 struct nfs4_sequence_res *res,
 717                                 struct rpc_task *task)
 718 {
 719         struct nfs4_slot *slot;
 720         struct nfs4_slot_table *tbl;
 721
 722         dprintk("--> %s\n", __func__);
 723         /* slot already allocated? */
 724         if (res->sr_slot != NULL)
 725                 goto out_success;
 726
 727         tbl = &session->fc_slot_table;
 728
 729         task->tk_timeout = 0;
 730
 731         spin_lock(&tbl->slot_tbl_lock);
 732         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 733             !args->sa_privileged) {
 734                 /* The state manager will wait until the slot table is empty */
 735                 dprintk("%s session is draining\n", __func__);
 736                 goto out_sleep;
 737         }
 738
 739         slot = nfs4_alloc_slot(tbl);
 740         if (IS_ERR(slot)) {
 741                 /* If out of memory, try again in 1/4 second */
 742                 if (slot == ERR_PTR(-ENOMEM))
 743                         task->tk_timeout = HZ >> 2;
 744                 dprintk("<-- %s: no free slots\n", __func__);
 745                 goto out_sleep;
 746         }
 747         spin_unlock(&tbl->slot_tbl_lock);
 748
 749         args->sa_slot = slot;
 750
 751         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 752                         slot->slot_nr, slot->seq_nr);
 753
 754         res->sr_slot = slot;
 755         res->sr_timestamp = jiffies;
 756         res->sr_status_flags = 0;
 757         /*
 758          * sr_status is only set in decode_sequence, and so will remain
 759          * set to 1 if an rpc level failure occurs.
 760          */
 761         res->sr_status = 1;
 762         trace_nfs4_setup_sequence(session, args);
 763 out_success:
 764         rpc_call_start(task);
 765         return 0;
 766 out_sleep:
 767         /* Privileged tasks are queued with top priority */
 768         if (args->sa_privileged)
 769                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 770                                 NULL, RPC_PRIORITY_PRIVILEGED);
 771         else
 772                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 773         spin_unlock(&tbl->slot_tbl_lock);
 774         return -EAGAIN;
 775 }
 776 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 777
 778 static int nfs4_setup_sequence(const struct nfs_server *server,
 779                                struct nfs4_sequence_args *args,
 780                                struct nfs4_sequence_res *res,
 781                                struct rpc_task *task)
 782 {
 783         struct nfs4_session *session = nfs4_get_session(server);
 784         int ret = 0;
 785
 786         if (!session)
 787                 return nfs40_setup_sequence(server, args, res, task);
 788
 789         dprintk("--> %s clp %p session %p sr_slot %u\n",
 790                 __func__, session->clp, session, res->sr_slot ?
 791                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 792
 793         ret = nfs41_setup_sequence(session, args, res, task);
 794
 795         dprintk("<-- %s status=%d\n", __func__, ret);
 796         return ret;
 797 }
 798
 799 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_call_sync_data *data = calldata;
 802         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 803
 804         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 805
 806         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 807 }
 808
 809 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 810 {
 811         struct nfs4_call_sync_data *data = calldata;
 812
 813         nfs41_sequence_done(task, data->seq_res);
 814 }
 815
 816 static const struct rpc_call_ops nfs41_call_sync_ops = {
 817         .rpc_call_prepare = nfs41_call_sync_prepare,
 818         .rpc_call_done = nfs41_call_sync_done,
 819 };
 820
 821 #else   /* !CONFIG_NFS_V4_1 */
 822
 823 static int nfs4_setup_sequence(const struct nfs_server *server,
 824                                struct nfs4_sequence_args *args,
 825                                struct nfs4_sequence_res *res,
 826                                struct rpc_task *task)
 827 {
 828         return nfs40_setup_sequence(server, args, res, task);
 829 }
 830
 831 static int nfs4_sequence_done(struct rpc_task *task,
 832                                struct nfs4_sequence_res *res)
 833 {
 834         return nfs40_sequence_done(task, res);
 835 }
 836
 837 #endif  /* !CONFIG_NFS_V4_1 */
 838
 839 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_call_sync_data *data = calldata;
 842         nfs4_setup_sequence(data->seq_server,
 843                                 data->seq_args, data->seq_res, task);
 844 }
 845
 846 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 847 {
 848         struct nfs4_call_sync_data *data = calldata;
 849         nfs4_sequence_done(task, data->seq_res);
 850 }
 851
 852 static const struct rpc_call_ops nfs40_call_sync_ops = {
 853         .rpc_call_prepare = nfs40_call_sync_prepare,
 854         .rpc_call_done = nfs40_call_sync_done,
 855 };
 856
 857 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 858                                    struct nfs_server *server,
 859                                    struct rpc_message *msg,
 860                                    struct nfs4_sequence_args *args,
 861                                    struct nfs4_sequence_res *res)
 862 {
 863         int ret;
 864         struct rpc_task *task;
 865         struct nfs_client *clp = server->nfs_client;
 866         struct nfs4_call_sync_data data = {
 867                 .seq_server = server,
 868                 .seq_args = args,
 869                 .seq_res = res,
 870         };
 871         struct rpc_task_setup task_setup = {
 872                 .rpc_client = clnt,
 873                 .rpc_message = msg,
 874                 .callback_ops = clp->cl_mvops->call_sync_ops,
 875                 .callback_data = &data
 876         };
 877
 878         task = rpc_run_task(&task_setup);
 879         if (IS_ERR(task))
 880                 ret = PTR_ERR(task);
 881         else {
 882                 ret = task->tk_status;
 883                 rpc_put_task(task);
 884         }
 885         return ret;
 886 }
 887
 888 int nfs4_call_sync(struct rpc_clnt *clnt,
 889                    struct nfs_server *server,
 890                    struct rpc_message *msg,
 891                    struct nfs4_sequence_args *args,
 892                    struct nfs4_sequence_res *res,
 893                    int cache_reply)
 894 {
 895         nfs4_init_sequence(args, res, cache_reply);
 896         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 897 }
 898
 899 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 900 {
 901         struct nfs_inode *nfsi = NFS_I(dir);
 902
 903         spin_lock(&dir->i_lock);
 904         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 905         if (!cinfo->atomic || cinfo->before != dir->i_version)
 906                 nfs_force_lookup_revalidate(dir);
 907         dir->i_version = cinfo->after;
 908         nfs_fscache_invalidate(dir);
 909         spin_unlock(&dir->i_lock);
 910 }
 911
 912 struct nfs4_opendata {
 913         struct kref kref;
 914         struct nfs_openargs o_arg;
 915         struct nfs_openres o_res;
 916         struct nfs_open_confirmargs c_arg;
 917         struct nfs_open_confirmres c_res;
 918         struct nfs4_string owner_name;
 919         struct nfs4_string group_name;
 920         struct nfs_fattr f_attr;
 921         struct nfs4_label *f_label;
 922         struct dentry *dir;
 923         struct dentry *dentry;
 924         struct nfs4_state_owner *owner;
 925         struct nfs4_state *state;
 926         struct iattr attrs;
 927         unsigned long timestamp;
 928         unsigned int rpc_done : 1;
 929         unsigned int file_created : 1;
 930         unsigned int is_recover : 1;
 931         int rpc_status;
 932         int cancelled;
 933 };
 934
 935 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 936                 int err, struct nfs4_exception *exception)
 937 {
 938         if (err != -EINVAL)
 939                 return false;
 940         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 941                 return false;
 942         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 943         exception->retry = 1;
 944         return true;
 945 }
 946
 947 static enum open_claim_type4
 948 nfs4_map_atomic_open_claim(struct nfs_server *server,
 949                 enum open_claim_type4 claim)
 950 {
 951         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 952                 return claim;
 953         switch (claim) {
 954         default:
 955                 return claim;
 956         case NFS4_OPEN_CLAIM_FH:
 957                 return NFS4_OPEN_CLAIM_NULL;
 958         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 959                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 960         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 961                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 962         }
 963 }
 964
 965 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 966 {
 967         p->o_res.f_attr = &p->f_attr;
 968         p->o_res.f_label = p->f_label;
 969         p->o_res.seqid = p->o_arg.seqid;
 970         p->c_res.seqid = p->c_arg.seqid;
 971         p->o_res.server = p->o_arg.server;
 972         p->o_res.access_request = p->o_arg.access;
 973         nfs_fattr_init(&p->f_attr);
 974         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 975 }
 976
 977 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 978                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 979                 const struct iattr *attrs,
 980                 struct nfs4_label *label,
 981                 enum open_claim_type4 claim,
 982                 gfp_t gfp_mask)
 983 {
 984         struct dentry *parent = dget_parent(dentry);
 985         struct inode *dir = parent->d_inode;
 986         struct nfs_server *server = NFS_SERVER(dir);
 987         struct nfs4_opendata *p;
 988
 989         p = kzalloc(sizeof(*p), gfp_mask);
 990         if (p == NULL)
 991                 goto err;
 992
 993         p->f_label = nfs4_label_alloc(server, gfp_mask);
 994         if (IS_ERR(p->f_label))
 995                 goto err_free_p;
 996
 997         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 998         if (p->o_arg.seqid == NULL)
 999                 goto err_free_label;
1000         nfs_sb_active(dentry->d_sb);
1001         p->dentry = dget(dentry);
1002         p->dir = parent;
1003         p->owner = sp;
1004         atomic_inc(&sp->so_count);
1005         p->o_arg.open_flags = flags;
1006         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1007         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1008          * will return permission denied for all bits until close */
1009         if (!(flags & O_EXCL)) {
1010                 /* ask server to check for all possible rights as results
1011                  * are cached */
1012                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1013                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1014         }
1015         p->o_arg.clientid = server->nfs_client->cl_clientid;
1016         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1017         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1018         p->o_arg.name = &dentry->d_name;
1019         p->o_arg.server = server;
1020         p->o_arg.bitmask = nfs4_bitmask(server, label);
1021         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1022         p->o_arg.label = label;
1023         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1024         switch (p->o_arg.claim) {
1025         case NFS4_OPEN_CLAIM_NULL:
1026         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1027         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1028                 p->o_arg.fh = NFS_FH(dir);
1029                 break;
1030         case NFS4_OPEN_CLAIM_PREVIOUS:
1031         case NFS4_OPEN_CLAIM_FH:
1032         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1033         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1034                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1035         }
1036         if (attrs != NULL && attrs->ia_valid != 0) {
1037                 __u32 verf[2];
1038
1039                 p->o_arg.u.attrs = &p->attrs;
1040                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1041
1042                 verf[0] = jiffies;
1043                 verf[1] = current->pid;
1044                 memcpy(p->o_arg.u.verifier.data, verf,
1045                                 sizeof(p->o_arg.u.verifier.data));
1046         }
1047         p->c_arg.fh = &p->o_res.fh;
1048         p->c_arg.stateid = &p->o_res.stateid;
1049         p->c_arg.seqid = p->o_arg.seqid;
1050         nfs4_init_opendata_res(p);
1051         kref_init(&p->kref);
1052         return p;
1053
1054 err_free_label:
1055         nfs4_label_free(p->f_label);
1056 err_free_p:
1057         kfree(p);
1058 err:
1059         dput(parent);
1060         return NULL;
1061 }
1062
1063 static void nfs4_opendata_free(struct kref *kref)
1064 {
1065         struct nfs4_opendata *p = container_of(kref,
1066                         struct nfs4_opendata, kref);
1067         struct super_block *sb = p->dentry->d_sb;
1068
1069         nfs_free_seqid(p->o_arg.seqid);
1070         if (p->state != NULL)
1071                 nfs4_put_open_state(p->state);
1072         nfs4_put_state_owner(p->owner);
1073
1074         nfs4_label_free(p->f_label);
1075
1076         dput(p->dir);
1077         dput(p->dentry);
1078         nfs_sb_deactive(sb);
1079         nfs_fattr_free_names(&p->f_attr);
1080         kfree(p->f_attr.mdsthreshold);
1081         kfree(p);
1082 }
1083
1084 static void nfs4_opendata_put(struct nfs4_opendata *p)
1085 {
1086         if (p != NULL)
1087                 kref_put(&p->kref, nfs4_opendata_free);
1088 }
1089
1090 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1091 {
1092         int ret;
1093
1094         ret = rpc_wait_for_completion_task(task);
1095         return ret;
1096 }
1097
1098 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1099 {
1100         int ret = 0;
1101
1102         if (open_mode & (O_EXCL|O_TRUNC))
1103                 goto out;
1104         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1105                 case FMODE_READ:
1106                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1107                                 && state->n_rdonly != 0;
1108                         break;
1109                 case FMODE_WRITE:
1110                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1111                                 && state->n_wronly != 0;
1112                         break;
1113                 case FMODE_READ|FMODE_WRITE:
1114                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1115                                 && state->n_rdwr != 0;
1116         }
1117 out:
1118         return ret;
1119 }
1120
1121 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1122 {
1123         if (delegation == NULL)
1124                 return 0;
1125         if ((delegation->type & fmode) != fmode)
1126                 return 0;
1127         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1128                 return 0;
1129         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1130                 return 0;
1131         nfs_mark_delegation_referenced(delegation);
1132         return 1;
1133 }
1134
1135 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1136 {
1137         switch (fmode) {
1138                 case FMODE_WRITE:
1139                         state->n_wronly++;
1140                         break;
1141                 case FMODE_READ:
1142                         state->n_rdonly++;
1143                         break;
1144                 case FMODE_READ|FMODE_WRITE:
1145                         state->n_rdwr++;
1146         }
1147         nfs4_state_set_mode_locked(state, state->state | fmode);
1148 }
1149
1150 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1151 {
1152         struct nfs_client *clp = state->owner->so_server->nfs_client;
1153         bool need_recover = false;
1154
1155         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1156                 need_recover = true;
1157         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1158                 need_recover = true;
1159         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1160                 need_recover = true;
1161         if (need_recover)
1162                 nfs4_state_mark_reclaim_nograce(clp, state);
1163 }
1164
1165 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1166                 nfs4_stateid *stateid)
1167 {
1168         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1169                 return true;
1170         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1171                 nfs_test_and_clear_all_open_stateid(state);
1172                 return true;
1173         }
1174         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1175                 return true;
1176         return false;
1177 }
1178
1179 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1180                 nfs4_stateid *stateid, fmode_t fmode)
1181 {
1182         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1183         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1184         case FMODE_WRITE:
1185                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1186                 break;
1187         case FMODE_READ:
1188                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1189                 break;
1190         case 0:
1191                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1192                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1193                 clear_bit(NFS_OPEN_STATE, &state->flags);
1194         }
1195         if (stateid == NULL)
1196                 return;
1197         if (!nfs_need_update_open_stateid(state, stateid))
1198                 return;
1199         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1200                 nfs4_stateid_copy(&state->stateid, stateid);
1201         nfs4_stateid_copy(&state->open_stateid, stateid);
1202 }
1203
1204 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205 {
1206         write_seqlock(&state->seqlock);
1207         nfs_clear_open_stateid_locked(state, stateid, fmode);
1208         write_sequnlock(&state->seqlock);
1209         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1210                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1211 }
1212
1213 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1214 {
1215         switch (fmode) {
1216                 case FMODE_READ:
1217                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1218                         break;
1219                 case FMODE_WRITE:
1220                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1221                         break;
1222                 case FMODE_READ|FMODE_WRITE:
1223                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1224         }
1225         if (!nfs_need_update_open_stateid(state, stateid))
1226                 return;
1227         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1228                 nfs4_stateid_copy(&state->stateid, stateid);
1229         nfs4_stateid_copy(&state->open_stateid, stateid);
1230 }
1231
1232 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1233 {
1234         /*
1235          * Protect the call to nfs4_state_set_mode_locked and
1236          * serialise the stateid update
1237          */
1238         write_seqlock(&state->seqlock);
1239         if (deleg_stateid != NULL) {
1240                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1241                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1242         }
1243         if (open_stateid != NULL)
1244                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1245         write_sequnlock(&state->seqlock);
1246         spin_lock(&state->owner->so_lock);
1247         update_open_stateflags(state, fmode);
1248         spin_unlock(&state->owner->so_lock);
1249 }
1250
1251 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1252 {
1253         struct nfs_inode *nfsi = NFS_I(state->inode);
1254         struct nfs_delegation *deleg_cur;
1255         int ret = 0;
1256
1257         fmode &= (FMODE_READ|FMODE_WRITE);
1258
1259         rcu_read_lock();
1260         deleg_cur = rcu_dereference(nfsi->delegation);
1261         if (deleg_cur == NULL)
1262                 goto no_delegation;
1263
1264         spin_lock(&deleg_cur->lock);
1265         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1266            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1267             (deleg_cur->type & fmode) != fmode)
1268                 goto no_delegation_unlock;
1269
1270         if (delegation == NULL)
1271                 delegation = &deleg_cur->stateid;
1272         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1273                 goto no_delegation_unlock;
1274
1275         nfs_mark_delegation_referenced(deleg_cur);
1276         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1277         ret = 1;
1278 no_delegation_unlock:
1279         spin_unlock(&deleg_cur->lock);
1280 no_delegation:
1281         rcu_read_unlock();
1282
1283         if (!ret && open_stateid != NULL) {
1284                 __update_open_stateid(state, open_stateid, NULL, fmode);
1285                 ret = 1;
1286         }
1287         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1288                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1289
1290         return ret;
1291 }
1292
1293
1294 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1295 {
1296         struct nfs_delegation *delegation;
1297
1298         rcu_read_lock();
1299         delegation = rcu_dereference(NFS_I(inode)->delegation);
1300         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1301                 rcu_read_unlock();
1302                 return;
1303         }
1304         rcu_read_unlock();
1305         nfs4_inode_return_delegation(inode);
1306 }
1307
1308 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1309 {
1310         struct nfs4_state *state = opendata->state;
1311         struct nfs_inode *nfsi = NFS_I(state->inode);
1312         struct nfs_delegation *delegation;
1313         int open_mode = opendata->o_arg.open_flags;
1314         fmode_t fmode = opendata->o_arg.fmode;
1315         nfs4_stateid stateid;
1316         int ret = -EAGAIN;
1317
1318         for (;;) {
1319                 spin_lock(&state->owner->so_lock);
1320                 if (can_open_cached(state, fmode, open_mode)) {
1321                         update_open_stateflags(state, fmode);
1322                         spin_unlock(&state->owner->so_lock);
1323                         goto out_return_state;
1324                 }
1325                 spin_unlock(&state->owner->so_lock);
1326                 rcu_read_lock();
1327                 delegation = rcu_dereference(nfsi->delegation);
1328                 if (!can_open_delegated(delegation, fmode)) {
1329                         rcu_read_unlock();
1330                         break;
1331                 }
1332                 /* Save the delegation */
1333                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1334                 rcu_read_unlock();
1335                 nfs_release_seqid(opendata->o_arg.seqid);
1336                 if (!opendata->is_recover) {
1337                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1338                         if (ret != 0)
1339                                 goto out;
1340                 }
1341                 ret = -EAGAIN;
1342
1343                 /* Try to update the stateid using the delegation */
1344                 if (update_open_stateid(state, NULL, &stateid, fmode))
1345                         goto out_return_state;
1346         }
1347 out:
1348         return ERR_PTR(ret);
1349 out_return_state:
1350         atomic_inc(&state->count);
1351         return state;
1352 }
1353
1354 static void
1355 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1356 {
1357         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1358         struct nfs_delegation *delegation;
1359         int delegation_flags = 0;
1360
1361         rcu_read_lock();
1362         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1363         if (delegation)
1364                 delegation_flags = delegation->flags;
1365         rcu_read_unlock();
1366         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1367                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1368                                    "returning a delegation for "
1369                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1370                                    clp->cl_hostname);
1371         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1372                 nfs_inode_set_delegation(state->inode,
1373                                          data->owner->so_cred,
1374                                          &data->o_res);
1375         else
1376                 nfs_inode_reclaim_delegation(state->inode,
1377                                              data->owner->so_cred,
1378                                              &data->o_res);
1379 }
1380
1381 /*
1382  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1383  * and update the nfs4_state.
1384  */
1385 static struct nfs4_state *
1386 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1387 {
1388         struct inode *inode = data->state->inode;
1389         struct nfs4_state *state = data->state;
1390         int ret;
1391
1392         if (!data->rpc_done) {
1393                 if (data->rpc_status) {
1394                         ret = data->rpc_status;
1395                         goto err;
1396                 }
1397                 /* cached opens have already been processed */
1398                 goto update;
1399         }
1400
1401         ret = nfs_refresh_inode(inode, &data->f_attr);
1402         if (ret)
1403                 goto err;
1404
1405         if (data->o_res.delegation_type != 0)
1406                 nfs4_opendata_check_deleg(data, state);
1407 update:
1408         update_open_stateid(state, &data->o_res.stateid, NULL,
1409                             data->o_arg.fmode);
1410         atomic_inc(&state->count);
1411
1412         return state;
1413 err:
1414         return ERR_PTR(ret);
1415
1416 }
1417
1418 static struct nfs4_state *
1419 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1420 {
1421         struct inode *inode;
1422         struct nfs4_state *state = NULL;
1423         int ret;
1424
1425         if (!data->rpc_done) {
1426                 state = nfs4_try_open_cached(data);
1427                 goto out;
1428         }
1429
1430         ret = -EAGAIN;
1431         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1432                 goto err;
1433         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1434         ret = PTR_ERR(inode);
1435         if (IS_ERR(inode))
1436                 goto err;
1437         ret = -ENOMEM;
1438         state = nfs4_get_open_state(inode, data->owner);
1439         if (state == NULL)
1440                 goto err_put_inode;
1441         if (data->o_res.delegation_type != 0)
1442                 nfs4_opendata_check_deleg(data, state);
1443         update_open_stateid(state, &data->o_res.stateid, NULL,
1444                         data->o_arg.fmode);
1445         iput(inode);
1446 out:
1447         nfs_release_seqid(data->o_arg.seqid);
1448         return state;
1449 err_put_inode:
1450         iput(inode);
1451 err:
1452         return ERR_PTR(ret);
1453 }
1454
1455 static struct nfs4_state *
1456 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1457 {
1458         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1459                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1460         return _nfs4_opendata_to_nfs4_state(data);
1461 }
1462
1463 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1464 {
1465         struct nfs_inode *nfsi = NFS_I(state->inode);
1466         struct nfs_open_context *ctx;
1467
1468         spin_lock(&state->inode->i_lock);
1469         list_for_each_entry(ctx, &nfsi->open_files, list) {
1470                 if (ctx->state != state)
1471                         continue;
1472                 get_nfs_open_context(ctx);
1473                 spin_unlock(&state->inode->i_lock);
1474                 return ctx;
1475         }
1476         spin_unlock(&state->inode->i_lock);
1477         return ERR_PTR(-ENOENT);
1478 }
1479
1480 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1481                 struct nfs4_state *state, enum open_claim_type4 claim)
1482 {
1483         struct nfs4_opendata *opendata;
1484
1485         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1486                         NULL, NULL, claim, GFP_NOFS);
1487         if (opendata == NULL)
1488                 return ERR_PTR(-ENOMEM);
1489         opendata->state = state;
1490         atomic_inc(&state->count);
1491         return opendata;
1492 }
1493
1494 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1495 {
1496         struct nfs4_state *newstate;
1497         int ret;
1498
1499         opendata->o_arg.open_flags = 0;
1500         opendata->o_arg.fmode = fmode;
1501         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1502         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1503         nfs4_init_opendata_res(opendata);
1504         ret = _nfs4_recover_proc_open(opendata);
1505         if (ret != 0)
1506                 return ret;
1507         newstate = nfs4_opendata_to_nfs4_state(opendata);
1508         if (IS_ERR(newstate))
1509                 return PTR_ERR(newstate);
1510         nfs4_close_state(newstate, fmode);
1511         *res = newstate;
1512         return 0;
1513 }
1514
1515 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1516 {
1517         struct nfs4_state *newstate;
1518         int ret;
1519
1520         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1521         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1522         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1523         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1524         /* memory barrier prior to reading state->n_* */
1525         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1526         clear_bit(NFS_OPEN_STATE, &state->flags);
1527         smp_rmb();
1528         if (state->n_rdwr != 0) {
1529                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1530                 if (ret != 0)
1531                         return ret;
1532                 if (newstate != state)
1533                         return -ESTALE;
1534         }
1535         if (state->n_wronly != 0) {
1536                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1537                 if (ret != 0)
1538                         return ret;
1539                 if (newstate != state)
1540                         return -ESTALE;
1541         }
1542         if (state->n_rdonly != 0) {
1543                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1544                 if (ret != 0)
1545                         return ret;
1546                 if (newstate != state)
1547                         return -ESTALE;
1548         }
1549         /*
1550          * We may have performed cached opens for all three recoveries.
1551          * Check if we need to update the current stateid.
1552          */
1553         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1554             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1555                 write_seqlock(&state->seqlock);
1556                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1557                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1558                 write_sequnlock(&state->seqlock);
1559         }
1560         return 0;
1561 }
1562
1563 /*
1564  * OPEN_RECLAIM:
1565  *      reclaim state on the server after a reboot.
1566  */
1567 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1568 {
1569         struct nfs_delegation *delegation;
1570         struct nfs4_opendata *opendata;
1571         fmode_t delegation_type = 0;
1572         int status;
1573
1574         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1575                         NFS4_OPEN_CLAIM_PREVIOUS);
1576         if (IS_ERR(opendata))
1577                 return PTR_ERR(opendata);
1578         rcu_read_lock();
1579         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1580         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1581                 delegation_type = delegation->type;
1582         rcu_read_unlock();
1583         opendata->o_arg.u.delegation_type = delegation_type;
1584         status = nfs4_open_recover(opendata, state);
1585         nfs4_opendata_put(opendata);
1586         return status;
1587 }
1588
1589 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1590 {
1591         struct nfs_server *server = NFS_SERVER(state->inode);
1592         struct nfs4_exception exception = { };
1593         int err;
1594         do {
1595                 err = _nfs4_do_open_reclaim(ctx, state);
1596                 trace_nfs4_open_reclaim(ctx, 0, err);
1597                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1598                         continue;
1599                 if (err != -NFS4ERR_DELAY)
1600                         break;
1601                 nfs4_handle_exception(server, err, &exception);
1602         } while (exception.retry);
1603         return err;
1604 }
1605
1606 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1607 {
1608         struct nfs_open_context *ctx;
1609         int ret;
1610
1611         ctx = nfs4_state_find_open_context(state);
1612         if (IS_ERR(ctx))
1613                 return -EAGAIN;
1614         ret = nfs4_do_open_reclaim(ctx, state);
1615         put_nfs_open_context(ctx);
1616         return ret;
1617 }
1618
1619 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1620 {
1621         switch (err) {
1622                 default:
1623                         printk(KERN_ERR "NFS: %s: unhandled error "
1624                                         "%d.\n", __func__, err);
1625                 case 0:
1626                 case -ENOENT:
1627                 case -ESTALE:
1628                         break;
1629                 case -NFS4ERR_BADSESSION:
1630                 case -NFS4ERR_BADSLOT:
1631                 case -NFS4ERR_BAD_HIGH_SLOT:
1632                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1633                 case -NFS4ERR_DEADSESSION:
1634                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1635                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1636                         return -EAGAIN;
1637                 case -NFS4ERR_STALE_CLIENTID:
1638                 case -NFS4ERR_STALE_STATEID:
1639                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1640                 case -NFS4ERR_EXPIRED:
1641                         /* Don't recall a delegation if it was lost */
1642                         nfs4_schedule_lease_recovery(server->nfs_client);
1643                         return -EAGAIN;
1644                 case -NFS4ERR_MOVED:
1645                         nfs4_schedule_migration_recovery(server);
1646                         return -EAGAIN;
1647                 case -NFS4ERR_LEASE_MOVED:
1648                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1649                         return -EAGAIN;
1650                 case -NFS4ERR_DELEG_REVOKED:
1651                 case -NFS4ERR_ADMIN_REVOKED:
1652                 case -NFS4ERR_BAD_STATEID:
1653                 case -NFS4ERR_OPENMODE:
1654                         nfs_inode_find_state_and_recover(state->inode,
1655                                         stateid);
1656                         nfs4_schedule_stateid_recovery(server, state);
1657                         return 0;
1658                 case -NFS4ERR_DELAY:
1659                 case -NFS4ERR_GRACE:
1660                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1661                         ssleep(1);
1662                         return -EAGAIN;
1663                 case -ENOMEM:
1664                 case -NFS4ERR_DENIED:
1665                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1666                         return 0;
1667         }
1668         return err;
1669 }
1670
1671 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1672 {
1673         struct nfs_server *server = NFS_SERVER(state->inode);
1674         struct nfs4_opendata *opendata;
1675         int err;
1676
1677         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1678                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1679         if (IS_ERR(opendata))
1680                 return PTR_ERR(opendata);
1681         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1682         err = nfs4_open_recover(opendata, state);
1683         nfs4_opendata_put(opendata);
1684         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1685 }
1686
1687 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1688 {
1689         struct nfs4_opendata *data = calldata;
1690
1691         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1692                                 &data->c_res.seq_res, task);
1693 }
1694
1695 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1696 {
1697         struct nfs4_opendata *data = calldata;
1698
1699         nfs40_sequence_done(task, &data->c_res.seq_res);
1700
1701         data->rpc_status = task->tk_status;
1702         if (data->rpc_status == 0) {
1703                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1704                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1705                 renew_lease(data->o_res.server, data->timestamp);
1706                 data->rpc_done = 1;
1707         }
1708 }
1709
1710 static void nfs4_open_confirm_release(void *calldata)
1711 {
1712         struct nfs4_opendata *data = calldata;
1713         struct nfs4_state *state = NULL;
1714
1715         /* If this request hasn't been cancelled, do nothing */
1716         if (data->cancelled == 0)
1717                 goto out_free;
1718         /* In case of error, no cleanup! */
1719         if (!data->rpc_done)
1720                 goto out_free;
1721         state = nfs4_opendata_to_nfs4_state(data);
1722         if (!IS_ERR(state))
1723                 nfs4_close_state(state, data->o_arg.fmode);
1724 out_free:
1725         nfs4_opendata_put(data);
1726 }
1727
1728 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1729         .rpc_call_prepare = nfs4_open_confirm_prepare,
1730         .rpc_call_done = nfs4_open_confirm_done,
1731         .rpc_release = nfs4_open_confirm_release,
1732 };
1733
1734 /*
1735  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1736  */
1737 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1738 {
1739         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1740         struct rpc_task *task;
1741         struct  rpc_message msg = {
1742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1743                 .rpc_argp = &data->c_arg,
1744                 .rpc_resp = &data->c_res,
1745                 .rpc_cred = data->owner->so_cred,
1746         };
1747         struct rpc_task_setup task_setup_data = {
1748                 .rpc_client = server->client,
1749                 .rpc_message = &msg,
1750                 .callback_ops = &nfs4_open_confirm_ops,
1751                 .callback_data = data,
1752                 .workqueue = nfsiod_workqueue,
1753                 .flags = RPC_TASK_ASYNC,
1754         };
1755         int status;
1756
1757         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1758         kref_get(&data->kref);
1759         data->rpc_done = 0;
1760         data->rpc_status = 0;
1761         data->timestamp = jiffies;
1762         task = rpc_run_task(&task_setup_data);
1763         if (IS_ERR(task))
1764                 return PTR_ERR(task);
1765         status = nfs4_wait_for_completion_rpc_task(task);
1766         if (status != 0) {
1767                 data->cancelled = 1;
1768                 smp_wmb();
1769         } else
1770                 status = data->rpc_status;
1771         rpc_put_task(task);
1772         return status;
1773 }
1774
1775 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1776 {
1777         struct nfs4_opendata *data = calldata;
1778         struct nfs4_state_owner *sp = data->owner;
1779         struct nfs_client *clp = sp->so_server->nfs_client;
1780
1781         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1782                 goto out_wait;
1783         /*
1784          * Check if we still need to send an OPEN call, or if we can use
1785          * a delegation instead.
1786          */
1787         if (data->state != NULL) {
1788                 struct nfs_delegation *delegation;
1789
1790                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1791                         goto out_no_action;
1792                 rcu_read_lock();
1793                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1794                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1795                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1796                     can_open_delegated(delegation, data->o_arg.fmode))
1797                         goto unlock_no_action;
1798                 rcu_read_unlock();
1799         }
1800         /* Update client id. */
1801         data->o_arg.clientid = clp->cl_clientid;
1802         switch (data->o_arg.claim) {
1803         case NFS4_OPEN_CLAIM_PREVIOUS:
1804         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1805         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1806                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1807         case NFS4_OPEN_CLAIM_FH:
1808                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1809                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1810         }
1811         data->timestamp = jiffies;
1812         if (nfs4_setup_sequence(data->o_arg.server,
1813                                 &data->o_arg.seq_args,
1814                                 &data->o_res.seq_res,
1815                                 task) != 0)
1816                 nfs_release_seqid(data->o_arg.seqid);
1817
1818         /* Set the create mode (note dependency on the session type) */
1819         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1820         if (data->o_arg.open_flags & O_EXCL) {
1821                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1822                 if (nfs4_has_persistent_session(clp))
1823                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1824                 else if (clp->cl_mvops->minor_version > 0)
1825                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1826         }
1827         return;
1828 unlock_no_action:
1829         rcu_read_unlock();
1830 out_no_action:
1831         task->tk_action = NULL;
1832 out_wait:
1833         nfs4_sequence_done(task, &data->o_res.seq_res);
1834 }
1835
1836 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1837 {
1838         struct nfs4_opendata *data = calldata;
1839
1840         data->rpc_status = task->tk_status;
1841
1842         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1843                 return;
1844
1845         if (task->tk_status == 0) {
1846                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1847                         switch (data->o_res.f_attr->mode & S_IFMT) {
1848                         case S_IFREG:
1849                                 break;
1850                         case S_IFLNK:
1851                                 data->rpc_status = -ELOOP;
1852                                 break;
1853                         case S_IFDIR:
1854                                 data->rpc_status = -EISDIR;
1855                                 break;
1856                         default:
1857                                 data->rpc_status = -ENOTDIR;
1858                         }
1859                 }
1860                 renew_lease(data->o_res.server, data->timestamp);
1861                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1862                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1863         }
1864         data->rpc_done = 1;
1865 }
1866
1867 static void nfs4_open_release(void *calldata)
1868 {
1869         struct nfs4_opendata *data = calldata;
1870         struct nfs4_state *state = NULL;
1871
1872         /* If this request hasn't been cancelled, do nothing */
1873         if (data->cancelled == 0)
1874                 goto out_free;
1875         /* In case of error, no cleanup! */
1876         if (data->rpc_status != 0 || !data->rpc_done)
1877                 goto out_free;
1878         /* In case we need an open_confirm, no cleanup! */
1879         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1880                 goto out_free;
1881         state = nfs4_opendata_to_nfs4_state(data);
1882         if (!IS_ERR(state))
1883                 nfs4_close_state(state, data->o_arg.fmode);
1884 out_free:
1885         nfs4_opendata_put(data);
1886 }
1887
1888 static const struct rpc_call_ops nfs4_open_ops = {
1889         .rpc_call_prepare = nfs4_open_prepare,
1890         .rpc_call_done = nfs4_open_done,
1891         .rpc_release = nfs4_open_release,
1892 };
1893
1894 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1895 {
1896         struct inode *dir = data->dir->d_inode;
1897         struct nfs_server *server = NFS_SERVER(dir);
1898         struct nfs_openargs *o_arg = &data->o_arg;
1899         struct nfs_openres *o_res = &data->o_res;
1900         struct rpc_task *task;
1901         struct rpc_message msg = {
1902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1903                 .rpc_argp = o_arg,
1904                 .rpc_resp = o_res,
1905                 .rpc_cred = data->owner->so_cred,
1906         };
1907         struct rpc_task_setup task_setup_data = {
1908                 .rpc_client = server->client,
1909                 .rpc_message = &msg,
1910                 .callback_ops = &nfs4_open_ops,
1911                 .callback_data = data,
1912                 .workqueue = nfsiod_workqueue,
1913                 .flags = RPC_TASK_ASYNC,
1914         };
1915         int status;
1916
1917         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1918         kref_get(&data->kref);
1919         data->rpc_done = 0;
1920         data->rpc_status = 0;
1921         data->cancelled = 0;
1922         data->is_recover = 0;
1923         if (isrecover) {
1924                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1925                 data->is_recover = 1;
1926         }
1927         task = rpc_run_task(&task_setup_data);
1928         if (IS_ERR(task))
1929                 return PTR_ERR(task);
1930         status = nfs4_wait_for_completion_rpc_task(task);
1931         if (status != 0) {
1932                 data->cancelled = 1;
1933                 smp_wmb();
1934         } else
1935                 status = data->rpc_status;
1936         rpc_put_task(task);
1937
1938         return status;
1939 }
1940
1941 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1942 {
1943         struct inode *dir = data->dir->d_inode;
1944         struct nfs_openres *o_res = &data->o_res;
1945         int status;
1946
1947         status = nfs4_run_open_task(data, 1);
1948         if (status != 0 || !data->rpc_done)
1949                 return status;
1950
1951         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1952
1953         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1954                 status = _nfs4_proc_open_confirm(data);
1955                 if (status != 0)
1956                         return status;
1957         }
1958
1959         return status;
1960 }
1961
1962 /*
1963  * Additional permission checks in order to distinguish between an
1964  * open for read, and an open for execute. This works around the
1965  * fact that NFSv4 OPEN treats read and execute permissions as being
1966  * the same.
1967  * Note that in the non-execute case, we want to turn off permission
1968  * checking if we just created a new file (POSIX open() semantics).
1969  */
1970 static int nfs4_opendata_access(struct rpc_cred *cred,
1971                                 struct nfs4_opendata *opendata,
1972                                 struct nfs4_state *state, fmode_t fmode,
1973                                 int openflags)
1974 {
1975         struct nfs_access_entry cache;
1976         u32 mask;
1977
1978         /* access call failed or for some reason the server doesn't
1979          * support any access modes -- defer access call until later */
1980         if (opendata->o_res.access_supported == 0)
1981                 return 0;
1982
1983         mask = 0;
1984         /*
1985          * Use openflags to check for exec, because fmode won't
1986          * always have FMODE_EXEC set when file open for exec.
1987          */
1988         if (openflags & __FMODE_EXEC) {
1989                 /* ONLY check for exec rights */
1990                 mask = MAY_EXEC;
1991         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1992                 mask = MAY_READ;
1993
1994         cache.cred = cred;
1995         cache.jiffies = jiffies;
1996         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1997         nfs_access_add_cache(state->inode, &cache);
1998
1999         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2000                 return 0;
2001
2002         /* even though OPEN succeeded, access is denied. Close the file */
2003         nfs4_close_state(state, fmode);
2004         return -EACCES;
2005 }
2006
2007 /*
2008  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2009  */
2010 static int _nfs4_proc_open(struct nfs4_opendata *data)
2011 {
2012         struct inode *dir = data->dir->d_inode;
2013         struct nfs_server *server = NFS_SERVER(dir);
2014         struct nfs_openargs *o_arg = &data->o_arg;
2015         struct nfs_openres *o_res = &data->o_res;
2016         int status;
2017
2018         status = nfs4_run_open_task(data, 0);
2019         if (!data->rpc_done)
2020                 return status;
2021         if (status != 0) {
2022                 if (status == -NFS4ERR_BADNAME &&
2023                                 !(o_arg->open_flags & O_CREAT))
2024                         return -ENOENT;
2025                 return status;
2026         }
2027
2028         nfs_fattr_map_and_free_names(server, &data->f_attr);
2029
2030         if (o_arg->open_flags & O_CREAT) {
2031                 update_changeattr(dir, &o_res->cinfo);
2032                 if (o_arg->open_flags & O_EXCL)
2033                         data->file_created = 1;
2034                 else if (o_res->cinfo.before != o_res->cinfo.after)
2035                         data->file_created = 1;
2036         }
2037         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2038                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2039         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2040                 status = _nfs4_proc_open_confirm(data);
2041                 if (status != 0)
2042                         return status;
2043         }
2044         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2045                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2046         return 0;
2047 }
2048
2049 static int nfs4_recover_expired_lease(struct nfs_server *server)
2050 {
2051         return nfs4_client_recover_expired_lease(server->nfs_client);
2052 }
2053
2054 /*
2055  * OPEN_EXPIRED:
2056  *      reclaim state on the server after a network partition.
2057  *      Assumes caller holds the appropriate lock
2058  */
2059 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2060 {
2061         struct nfs4_opendata *opendata;
2062         int ret;
2063
2064         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2065                         NFS4_OPEN_CLAIM_FH);
2066         if (IS_ERR(opendata))
2067                 return PTR_ERR(opendata);
2068         ret = nfs4_open_recover(opendata, state);
2069         if (ret == -ESTALE)
2070                 d_drop(ctx->dentry);
2071         nfs4_opendata_put(opendata);
2072         return ret;
2073 }
2074
2075 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2076 {
2077         struct nfs_server *server = NFS_SERVER(state->inode);
2078         struct nfs4_exception exception = { };
2079         int err;
2080
2081         do {
2082                 err = _nfs4_open_expired(ctx, state);
2083                 trace_nfs4_open_expired(ctx, 0, err);
2084                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2085                         continue;
2086                 switch (err) {
2087                 default:
2088                         goto out;
2089                 case -NFS4ERR_GRACE:
2090                 case -NFS4ERR_DELAY:
2091                         nfs4_handle_exception(server, err, &exception);
2092                         err = 0;
2093                 }
2094         } while (exception.retry);
2095 out:
2096         return err;
2097 }
2098
2099 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2100 {
2101         struct nfs_open_context *ctx;
2102         int ret;
2103
2104         ctx = nfs4_state_find_open_context(state);
2105         if (IS_ERR(ctx))
2106                 return -EAGAIN;
2107         ret = nfs4_do_open_expired(ctx, state);
2108         put_nfs_open_context(ctx);
2109         return ret;
2110 }
2111
2112 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2113 {
2114         nfs_remove_bad_delegation(state->inode);
2115         write_seqlock(&state->seqlock);
2116         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2117         write_sequnlock(&state->seqlock);
2118         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2119 }
2120
2121 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2122 {
2123         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2124                 nfs_finish_clear_delegation_stateid(state);
2125 }
2126
2127 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2128 {
2129         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2130         nfs40_clear_delegation_stateid(state);
2131         return nfs4_open_expired(sp, state);
2132 }
2133
2134 #if defined(CONFIG_NFS_V4_1)
2135 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2136 {
2137         struct nfs_server *server = NFS_SERVER(state->inode);
2138         nfs4_stateid stateid;
2139         struct nfs_delegation *delegation;
2140         struct rpc_cred *cred;
2141         int status;
2142
2143         /* Get the delegation credential for use by test/free_stateid */
2144         rcu_read_lock();
2145         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2146         if (delegation == NULL) {
2147                 rcu_read_unlock();
2148                 return;
2149         }
2150
2151         nfs4_stateid_copy(&stateid, &delegation->stateid);
2152         cred = get_rpccred(delegation->cred);
2153         rcu_read_unlock();
2154         status = nfs41_test_stateid(server, &stateid, cred);
2155         trace_nfs4_test_delegation_stateid(state, NULL, status);
2156
2157         if (status != NFS_OK) {
2158                 /* Free the stateid unless the server explicitly
2159                  * informs us the stateid is unrecognized. */
2160                 if (status != -NFS4ERR_BAD_STATEID)
2161                         nfs41_free_stateid(server, &stateid, cred);
2162                 nfs_finish_clear_delegation_stateid(state);
2163         }
2164
2165         put_rpccred(cred);
2166 }
2167
2168 /**
2169  * nfs41_check_open_stateid - possibly free an open stateid
2170  *
2171  * @state: NFSv4 state for an inode
2172  *
2173  * Returns NFS_OK if recovery for this stateid is now finished.
2174  * Otherwise a negative NFS4ERR value is returned.
2175  */
2176 static int nfs41_check_open_stateid(struct nfs4_state *state)
2177 {
2178         struct nfs_server *server = NFS_SERVER(state->inode);
2179         nfs4_stateid *stateid = &state->open_stateid;
2180         struct rpc_cred *cred = state->owner->so_cred;
2181         int status;
2182
2183         /* If a state reset has been done, test_stateid is unneeded */
2184         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2185             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2186             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2187                 return -NFS4ERR_BAD_STATEID;
2188
2189         status = nfs41_test_stateid(server, stateid, cred);
2190         trace_nfs4_test_open_stateid(state, NULL, status);
2191         if (status != NFS_OK) {
2192                 /* Free the stateid unless the server explicitly
2193                  * informs us the stateid is unrecognized. */
2194                 if (status != -NFS4ERR_BAD_STATEID)
2195                         nfs41_free_stateid(server, stateid, cred);
2196
2197                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2198                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2199                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2200                 clear_bit(NFS_OPEN_STATE, &state->flags);
2201         }
2202         return status;
2203 }
2204
2205 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2206 {
2207         int status;
2208
2209         nfs41_check_delegation_stateid(state);
2210         status = nfs41_check_open_stateid(state);
2211         if (status != NFS_OK)
2212                 status = nfs4_open_expired(sp, state);
2213         return status;
2214 }
2215 #endif
2216
2217 /*
2218  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2219  * fields corresponding to attributes that were used to store the verifier.
2220  * Make sure we clobber those fields in the later setattr call
2221  */
2222 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2223 {
2224         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2225             !(sattr->ia_valid & ATTR_ATIME_SET))
2226                 sattr->ia_valid |= ATTR_ATIME;
2227
2228         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2229             !(sattr->ia_valid & ATTR_MTIME_SET))
2230                 sattr->ia_valid |= ATTR_MTIME;
2231 }
2232
2233 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2234                 fmode_t fmode,
2235                 int flags,
2236                 struct nfs_open_context *ctx)
2237 {
2238         struct nfs4_state_owner *sp = opendata->owner;
2239         struct nfs_server *server = sp->so_server;
2240         struct dentry *dentry;
2241         struct nfs4_state *state;
2242         unsigned int seq;
2243         int ret;
2244
2245         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2246
2247         ret = _nfs4_proc_open(opendata);
2248         if (ret != 0)
2249                 goto out;
2250
2251         state = nfs4_opendata_to_nfs4_state(opendata);
2252         ret = PTR_ERR(state);
2253         if (IS_ERR(state))
2254                 goto out;
2255         if (server->caps & NFS_CAP_POSIX_LOCK)
2256                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2257
2258         dentry = opendata->dentry;
2259         if (dentry->d_inode == NULL) {
2260                 /* FIXME: Is this d_drop() ever needed? */
2261                 d_drop(dentry);
2262                 dentry = d_add_unique(dentry, igrab(state->inode));
2263                 if (dentry == NULL) {
2264                         dentry = opendata->dentry;
2265                 } else if (dentry != ctx->dentry) {
2266                         dput(ctx->dentry);
2267                         ctx->dentry = dget(dentry);
2268                 }
2269                 nfs_set_verifier(dentry,
2270                                 nfs_save_change_attribute(opendata->dir->d_inode));
2271         }
2272
2273         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2274         if (ret != 0)
2275                 goto out;
2276
2277         ctx->state = state;
2278         if (dentry->d_inode == state->inode) {
2279                 nfs_inode_attach_open_context(ctx);
2280                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2281                         nfs4_schedule_stateid_recovery(server, state);
2282         }
2283 out:
2284         return ret;
2285 }
2286
2287 /*
2288  * Returns a referenced nfs4_state
2289  */
2290 static int _nfs4_do_open(struct inode *dir,
2291                         struct nfs_open_context *ctx,
2292                         int flags,
2293                         struct iattr *sattr,
2294                         struct nfs4_label *label,
2295                         int *opened)
2296 {
2297         struct nfs4_state_owner  *sp;
2298         struct nfs4_state     *state = NULL;
2299         struct nfs_server       *server = NFS_SERVER(dir);
2300         struct nfs4_opendata *opendata;
2301         struct dentry *dentry = ctx->dentry;
2302         struct rpc_cred *cred = ctx->cred;
2303         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2304         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2305         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2306         struct nfs4_label *olabel = NULL;
2307         int status;
2308
2309         /* Protect against reboot recovery conflicts */
2310         status = -ENOMEM;
2311         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2312         if (sp == NULL) {
2313                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2314                 goto out_err;
2315         }
2316         status = nfs4_recover_expired_lease(server);
2317         if (status != 0)
2318                 goto err_put_state_owner;
2319         if (dentry->d_inode != NULL)
2320                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2321         status = -ENOMEM;
2322         if (dentry->d_inode)
2323                 claim = NFS4_OPEN_CLAIM_FH;
2324         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2325                         label, claim, GFP_KERNEL);
2326         if (opendata == NULL)
2327                 goto err_put_state_owner;
2328
2329         if (label) {
2330                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2331                 if (IS_ERR(olabel)) {
2332                         status = PTR_ERR(olabel);
2333                         goto err_opendata_put;
2334                 }
2335         }
2336
2337         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2338                 if (!opendata->f_attr.mdsthreshold) {
2339                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2340                         if (!opendata->f_attr.mdsthreshold)
2341                                 goto err_free_label;
2342                 }
2343                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2344         }
2345         if (dentry->d_inode != NULL)
2346                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2347
2348         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2349         if (status != 0)
2350                 goto err_free_label;
2351         state = ctx->state;
2352
2353         if ((opendata->o_arg.open_flags & O_EXCL) &&
2354             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2355                 nfs4_exclusive_attrset(opendata, sattr);
2356
2357                 nfs_fattr_init(opendata->o_res.f_attr);
2358                 status = nfs4_do_setattr(state->inode, cred,
2359                                 opendata->o_res.f_attr, sattr,
2360                                 state, label, olabel);
2361                 if (status == 0) {
2362                         nfs_setattr_update_inode(state->inode, sattr);
2363                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2364                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2365                 }
2366         }
2367         if (opendata->file_created)
2368                 *opened |= FILE_CREATED;
2369
2370         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2371                 *ctx_th = opendata->f_attr.mdsthreshold;
2372                 opendata->f_attr.mdsthreshold = NULL;
2373         }
2374
2375         nfs4_label_free(olabel);
2376
2377         nfs4_opendata_put(opendata);
2378         nfs4_put_state_owner(sp);
2379         return 0;
2380 err_free_label:
2381         nfs4_label_free(olabel);
2382 err_opendata_put:
2383         nfs4_opendata_put(opendata);
2384 err_put_state_owner:
2385         nfs4_put_state_owner(sp);
2386 out_err:
2387         return status;
2388 }
2389
2390
2391 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2392                                         struct nfs_open_context *ctx,
2393                                         int flags,
2394                                         struct iattr *sattr,
2395                                         struct nfs4_label *label,
2396                                         int *opened)
2397 {
2398         struct nfs_server *server = NFS_SERVER(dir);
2399         struct nfs4_exception exception = { };
2400         struct nfs4_state *res;
2401         int status;
2402
2403         do {
2404                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2405                 res = ctx->state;
2406                 trace_nfs4_open_file(ctx, flags, status);
2407                 if (status == 0)
2408                         break;
2409                 /* NOTE: BAD_SEQID means the server and client disagree about the
2410                  * book-keeping w.r.t. state-changing operations
2411                  * (OPEN/CLOSE/LOCK/LOCKU...)
2412                  * It is actually a sign of a bug on the client or on the server.
2413                  *
2414                  * If we receive a BAD_SEQID error in the particular case of
2415                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2416                  * have unhashed the old state_owner for us, and that we can
2417                  * therefore safely retry using a new one. We should still warn
2418                  * the user though...
2419                  */
2420                 if (status == -NFS4ERR_BAD_SEQID) {
2421                         pr_warn_ratelimited("NFS: v4 server %s "
2422                                         " returned a bad sequence-id error!\n",
2423                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2424                         exception.retry = 1;
2425                         continue;
2426                 }
2427                 /*
2428                  * BAD_STATEID on OPEN means that the server cancelled our
2429                  * state before it received the OPEN_CONFIRM.
2430                  * Recover by retrying the request as per the discussion
2431                  * on Page 181 of RFC3530.
2432                  */
2433                 if (status == -NFS4ERR_BAD_STATEID) {
2434                         exception.retry = 1;
2435                         continue;
2436                 }
2437                 if (status == -EAGAIN) {
2438                         /* We must have found a delegation */
2439                         exception.retry = 1;
2440                         continue;
2441                 }
2442                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2443                         continue;
2444                 res = ERR_PTR(nfs4_handle_exception(server,
2445                                         status, &exception));
2446         } while (exception.retry);
2447         return res;
2448 }
2449
2450 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2451                             struct nfs_fattr *fattr, struct iattr *sattr,
2452                             struct nfs4_state *state, struct nfs4_label *ilabel,
2453                             struct nfs4_label *olabel)
2454 {
2455         struct nfs_server *server = NFS_SERVER(inode);
2456         struct nfs_setattrargs  arg = {
2457                 .fh             = NFS_FH(inode),
2458                 .iap            = sattr,
2459                 .server         = server,
2460                 .bitmask = server->attr_bitmask,
2461                 .label          = ilabel,
2462         };
2463         struct nfs_setattrres  res = {
2464                 .fattr          = fattr,
2465                 .label          = olabel,
2466                 .server         = server,
2467         };
2468         struct rpc_message msg = {
2469                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2470                 .rpc_argp       = &arg,
2471                 .rpc_resp       = &res,
2472                 .rpc_cred       = cred,
2473         };
2474         unsigned long timestamp = jiffies;
2475         fmode_t fmode;
2476         bool truncate;
2477         int status;
2478
2479         arg.bitmask = nfs4_bitmask(server, ilabel);
2480         if (ilabel)
2481                 arg.bitmask = nfs4_bitmask(server, olabel);
2482
2483         nfs_fattr_init(fattr);
2484
2485         /* Servers should only apply open mode checks for file size changes */
2486         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2487         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2488
2489         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2490                 /* Use that stateid */
2491         } else if (truncate && state != NULL) {
2492                 struct nfs_lockowner lockowner = {
2493                         .l_owner = current->files,
2494                         .l_pid = current->tgid,
2495                 };
2496                 if (!nfs4_valid_open_stateid(state))
2497                         return -EBADF;
2498                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2499                                 &lockowner) == -EIO)
2500                         return -EBADF;
2501         } else
2502                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2503
2504         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2505         if (status == 0 && state != NULL)
2506                 renew_lease(server, timestamp);
2507         return status;
2508 }
2509
2510 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2511                            struct nfs_fattr *fattr, struct iattr *sattr,
2512                            struct nfs4_state *state, struct nfs4_label *ilabel,
2513                            struct nfs4_label *olabel)
2514 {
2515         struct nfs_server *server = NFS_SERVER(inode);
2516         struct nfs4_exception exception = {
2517                 .state = state,
2518                 .inode = inode,
2519         };
2520         int err;
2521         do {
2522                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2523                 trace_nfs4_setattr(inode, err);
2524                 switch (err) {
2525                 case -NFS4ERR_OPENMODE:
2526                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2527                                 pr_warn_once("NFSv4: server %s is incorrectly "
2528                                                 "applying open mode checks to "
2529                                                 "a SETATTR that is not "
2530                                                 "changing file size.\n",
2531                                                 server->nfs_client->cl_hostname);
2532                         }
2533                         if (state && !(state->state & FMODE_WRITE)) {
2534                                 err = -EBADF;
2535                                 if (sattr->ia_valid & ATTR_OPEN)
2536                                         err = -EACCES;
2537                                 goto out;
2538                         }
2539                 }
2540                 err = nfs4_handle_exception(server, err, &exception);
2541         } while (exception.retry);
2542 out:
2543         return err;
2544 }
2545
2546 struct nfs4_closedata {
2547         struct inode *inode;
2548         struct nfs4_state *state;
2549         struct nfs_closeargs arg;
2550         struct nfs_closeres res;
2551         struct nfs_fattr fattr;
2552         unsigned long timestamp;
2553         bool roc;
2554         u32 roc_barrier;
2555 };
2556
2557 static void nfs4_free_closedata(void *data)
2558 {
2559         struct nfs4_closedata *calldata = data;
2560         struct nfs4_state_owner *sp = calldata->state->owner;
2561         struct super_block *sb = calldata->state->inode->i_sb;
2562
2563         if (calldata->roc)
2564                 pnfs_roc_release(calldata->state->inode);
2565         nfs4_put_open_state(calldata->state);
2566         nfs_free_seqid(calldata->arg.seqid);
2567         nfs4_put_state_owner(sp);
2568         nfs_sb_deactive(sb);
2569         kfree(calldata);
2570 }
2571
2572 static void nfs4_close_done(struct rpc_task *task, void *data)
2573 {
2574         struct nfs4_closedata *calldata = data;
2575         struct nfs4_state *state = calldata->state;
2576         struct nfs_server *server = NFS_SERVER(calldata->inode);
2577         nfs4_stateid *res_stateid = NULL;
2578
2579         dprintk("%s: begin!\n", __func__);
2580         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2581                 return;
2582         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2583         /* hmm. we are done with the inode, and in the process of freeing
2584          * the state_owner. we keep this around to process errors
2585          */
2586         switch (task->tk_status) {
2587                 case 0:
2588                         res_stateid = &calldata->res.stateid;
2589                         if (calldata->arg.fmode == 0 && calldata->roc)
2590                                 pnfs_roc_set_barrier(state->inode,
2591                                                      calldata->roc_barrier);
2592                         renew_lease(server, calldata->timestamp);
2593                         break;
2594                 case -NFS4ERR_ADMIN_REVOKED:
2595                 case -NFS4ERR_STALE_STATEID:
2596                 case -NFS4ERR_OLD_STATEID:
2597                 case -NFS4ERR_BAD_STATEID:
2598                 case -NFS4ERR_EXPIRED:
2599                         if (calldata->arg.fmode == 0)
2600                                 break;
2601                 default:
2602                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2603                                 rpc_restart_call_prepare(task);
2604                                 goto out_release;
2605                         }
2606         }
2607         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2608 out_release:
2609         nfs_release_seqid(calldata->arg.seqid);
2610         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2611         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2612 }
2613
2614 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2615 {
2616         struct nfs4_closedata *calldata = data;
2617         struct nfs4_state *state = calldata->state;
2618         struct inode *inode = calldata->inode;
2619         bool is_rdonly, is_wronly, is_rdwr;
2620         int call_close = 0;
2621
2622         dprintk("%s: begin!\n", __func__);
2623         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2624                 goto out_wait;
2625
2626         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2627         spin_lock(&state->owner->so_lock);
2628         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2629         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2630         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2631         /* Calculate the change in open mode */
2632         calldata->arg.fmode = 0;
2633         if (state->n_rdwr == 0) {
2634                 if (state->n_rdonly == 0)
2635                         call_close |= is_rdonly;
2636                 else if (is_rdonly)
2637                         calldata->arg.fmode |= FMODE_READ;
2638                 if (state->n_wronly == 0)
2639                         call_close |= is_wronly;
2640                 else if (is_wronly)
2641                         calldata->arg.fmode |= FMODE_WRITE;
2642         } else if (is_rdwr)
2643                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2644
2645         if (calldata->arg.fmode == 0)
2646                 call_close |= is_rdwr;
2647
2648         if (!nfs4_valid_open_stateid(state))
2649                 call_close = 0;
2650         spin_unlock(&state->owner->so_lock);
2651
2652         if (!call_close) {
2653                 /* Note: exit _without_ calling nfs4_close_done */
2654                 goto out_no_action;
2655         }
2656
2657         if (calldata->arg.fmode == 0) {
2658                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2659                 if (calldata->roc &&
2660                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2661                         nfs_release_seqid(calldata->arg.seqid);
2662                         goto out_wait;
2663                     }
2664         }
2665
2666         nfs_fattr_init(calldata->res.fattr);
2667         calldata->timestamp = jiffies;
2668         if (nfs4_setup_sequence(NFS_SERVER(inode),
2669                                 &calldata->arg.seq_args,
2670                                 &calldata->res.seq_res,
2671                                 task) != 0)
2672                 nfs_release_seqid(calldata->arg.seqid);
2673         dprintk("%s: done!\n", __func__);
2674         return;
2675 out_no_action:
2676         task->tk_action = NULL;
2677 out_wait:
2678         nfs4_sequence_done(task, &calldata->res.seq_res);
2679 }
2680
2681 static const struct rpc_call_ops nfs4_close_ops = {
2682         .rpc_call_prepare = nfs4_close_prepare,
2683         .rpc_call_done = nfs4_close_done,
2684         .rpc_release = nfs4_free_closedata,
2685 };
2686
2687 static bool nfs4_state_has_opener(struct nfs4_state *state)
2688 {
2689         /* first check existing openers */
2690         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2691             state->n_rdonly != 0)
2692                 return true;
2693
2694         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2695             state->n_wronly != 0)
2696                 return true;
2697
2698         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2699             state->n_rdwr != 0)
2700                 return true;
2701
2702         return false;
2703 }
2704
2705 static bool nfs4_roc(struct inode *inode)
2706 {
2707         struct nfs_inode *nfsi = NFS_I(inode);
2708         struct nfs_open_context *ctx;
2709         struct nfs4_state *state;
2710
2711         spin_lock(&inode->i_lock);
2712         list_for_each_entry(ctx, &nfsi->open_files, list) {
2713                 state = ctx->state;
2714                 if (state == NULL)
2715                         continue;
2716                 if (nfs4_state_has_opener(state)) {
2717                         spin_unlock(&inode->i_lock);
2718                         return false;
2719                 }
2720         }
2721         spin_unlock(&inode->i_lock);
2722
2723         if (nfs4_check_delegation(inode, FMODE_READ))
2724                 return false;
2725
2726         return pnfs_roc(inode);
2727 }
2728
2729 /*
2730  * It is possible for data to be read/written from a mem-mapped file
2731  * after the sys_close call (which hits the vfs layer as a flush).
2732  * This means that we can't safely call nfsv4 close on a file until
2733  * the inode is cleared. This in turn means that we are not good
2734  * NFSv4 citizens - we do not indicate to the server to update the file's
2735  * share state even when we are done with one of the three share
2736  * stateid's in the inode.
2737  *
2738  * NOTE: Caller must be holding the sp->so_owner semaphore!
2739  */
2740 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2741 {
2742         struct nfs_server *server = NFS_SERVER(state->inode);
2743         struct nfs4_closedata *calldata;
2744         struct nfs4_state_owner *sp = state->owner;
2745         struct rpc_task *task;
2746         struct rpc_message msg = {
2747                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2748                 .rpc_cred = state->owner->so_cred,
2749         };
2750         struct rpc_task_setup task_setup_data = {
2751                 .rpc_client = server->client,
2752                 .rpc_message = &msg,
2753                 .callback_ops = &nfs4_close_ops,
2754                 .workqueue = nfsiod_workqueue,
2755                 .flags = RPC_TASK_ASYNC,
2756         };
2757         int status = -ENOMEM;
2758
2759         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2760                 &task_setup_data.rpc_client, &msg);
2761
2762         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2763         if (calldata == NULL)
2764                 goto out;
2765         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2766         calldata->inode = state->inode;
2767         calldata->state = state;
2768         calldata->arg.fh = NFS_FH(state->inode);
2769         calldata->arg.stateid = &state->open_stateid;
2770         /* Serialization for the sequence id */
2771         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2772         if (calldata->arg.seqid == NULL)
2773                 goto out_free_calldata;
2774         calldata->arg.fmode = 0;
2775         calldata->arg.bitmask = server->cache_consistency_bitmask;
2776         calldata->res.fattr = &calldata->fattr;
2777         calldata->res.seqid = calldata->arg.seqid;
2778         calldata->res.server = server;
2779         calldata->roc = nfs4_roc(state->inode);
2780         nfs_sb_active(calldata->inode->i_sb);
2781
2782         msg.rpc_argp = &calldata->arg;
2783         msg.rpc_resp = &calldata->res;
2784         task_setup_data.callback_data = calldata;
2785         task = rpc_run_task(&task_setup_data);
2786         if (IS_ERR(task))
2787                 return PTR_ERR(task);
2788         status = 0;
2789         if (wait)
2790                 status = rpc_wait_for_completion_task(task);
2791         rpc_put_task(task);
2792         return status;
2793 out_free_calldata:
2794         kfree(calldata);
2795 out:
2796         nfs4_put_open_state(state);
2797         nfs4_put_state_owner(sp);
2798         return status;
2799 }
2800
2801 static struct inode *
2802 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2803                 int open_flags, struct iattr *attr, int *opened)
2804 {
2805         struct nfs4_state *state;
2806         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2807
2808         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2809
2810         /* Protect against concurrent sillydeletes */
2811         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2812
2813         nfs4_label_release_security(label);
2814
2815         if (IS_ERR(state))
2816                 return ERR_CAST(state);
2817         return state->inode;
2818 }
2819
2820 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2821 {
2822         if (ctx->state == NULL)
2823                 return;
2824         if (is_sync)
2825                 nfs4_close_sync(ctx->state, ctx->mode);
2826         else
2827                 nfs4_close_state(ctx->state, ctx->mode);
2828 }
2829
2830 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2831 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2832 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2833
2834 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2835 {
2836         struct nfs4_server_caps_arg args = {
2837                 .fhandle = fhandle,
2838         };
2839         struct nfs4_server_caps_res res = {};
2840         struct rpc_message msg = {
2841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2842                 .rpc_argp = &args,
2843                 .rpc_resp = &res,
2844         };
2845         int status;
2846
2847         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2848         if (status == 0) {
2849                 /* Sanity check the server answers */
2850                 switch (server->nfs_client->cl_minorversion) {
2851                 case 0:
2852                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2853                         res.attr_bitmask[2] = 0;
2854                         break;
2855                 case 1:
2856                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2857                         break;
2858                 case 2:
2859                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2860                 }
2861                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2862                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2863                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2864                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2865                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2866                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2867                                 NFS_CAP_SECURITY_LABEL);
2868                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2869                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2870                         server->caps |= NFS_CAP_ACLS;
2871                 if (res.has_links != 0)
2872                         server->caps |= NFS_CAP_HARDLINKS;
2873                 if (res.has_symlinks != 0)
2874                         server->caps |= NFS_CAP_SYMLINKS;
2875                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2876                         server->caps |= NFS_CAP_FILEID;
2877                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2878                         server->caps |= NFS_CAP_MODE;
2879                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2880                         server->caps |= NFS_CAP_NLINK;
2881                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2882                         server->caps |= NFS_CAP_OWNER;
2883                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2884                         server->caps |= NFS_CAP_OWNER_GROUP;
2885                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2886                         server->caps |= NFS_CAP_ATIME;
2887                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2888                         server->caps |= NFS_CAP_CTIME;
2889                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2890                         server->caps |= NFS_CAP_MTIME;
2891 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2892                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2893                         server->caps |= NFS_CAP_SECURITY_LABEL;
2894 #endif
2895                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2896                                 sizeof(server->attr_bitmask));
2897                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2898
2899                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2900                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2901                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2902                 server->cache_consistency_bitmask[2] = 0;
2903                 server->acl_bitmask = res.acl_bitmask;
2904                 server->fh_expire_type = res.fh_expire_type;
2905         }
2906
2907         return status;
2908 }
2909
2910 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2911 {
2912         struct nfs4_exception exception = { };
2913         int err;
2914         do {
2915                 err = nfs4_handle_exception(server,
2916                                 _nfs4_server_capabilities(server, fhandle),
2917                                 &exception);
2918         } while (exception.retry);
2919         return err;
2920 }
2921
2922 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2923                 struct nfs_fsinfo *info)
2924 {
2925         u32 bitmask[3];
2926         struct nfs4_lookup_root_arg args = {
2927                 .bitmask = bitmask,
2928         };
2929         struct nfs4_lookup_res res = {
2930                 .server = server,
2931                 .fattr = info->fattr,
2932                 .fh = fhandle,
2933         };
2934         struct rpc_message msg = {
2935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2936                 .rpc_argp = &args,
2937                 .rpc_resp = &res,
2938         };
2939
2940         bitmask[0] = nfs4_fattr_bitmap[0];
2941         bitmask[1] = nfs4_fattr_bitmap[1];
2942         /*
2943          * Process the label in the upcoming getfattr
2944          */
2945         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2946
2947         nfs_fattr_init(info->fattr);
2948         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2949 }
2950
2951 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2952                 struct nfs_fsinfo *info)
2953 {
2954         struct nfs4_exception exception = { };
2955         int err;
2956         do {
2957                 err = _nfs4_lookup_root(server, fhandle, info);
2958                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2959                 switch (err) {
2960                 case 0:
2961                 case -NFS4ERR_WRONGSEC:
2962                         goto out;
2963                 default:
2964                         err = nfs4_handle_exception(server, err, &exception);
2965                 }
2966         } while (exception.retry);
2967 out:
2968         return err;
2969 }
2970
2971 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2972                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2973 {
2974         struct rpc_auth_create_args auth_args = {
2975                 .pseudoflavor = flavor,
2976         };
2977         struct rpc_auth *auth;
2978         int ret;
2979
2980         auth = rpcauth_create(&auth_args, server->client);
2981         if (IS_ERR(auth)) {
2982                 ret = -EACCES;
2983                 goto out;
2984         }
2985         ret = nfs4_lookup_root(server, fhandle, info);
2986 out:
2987         return ret;
2988 }
2989
2990 /*
2991  * Retry pseudoroot lookup with various security flavors.  We do this when:
2992  *
2993  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2994  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2995  *
2996  * Returns zero on success, or a negative NFS4ERR value, or a
2997  * negative errno value.
2998  */
2999 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3000                               struct nfs_fsinfo *info)
3001 {
3002         /* Per 3530bis 15.33.5 */
3003         static const rpc_authflavor_t flav_array[] = {
3004                 RPC_AUTH_GSS_KRB5P,
3005                 RPC_AUTH_GSS_KRB5I,
3006                 RPC_AUTH_GSS_KRB5,
3007                 RPC_AUTH_UNIX,                  /* courtesy */
3008                 RPC_AUTH_NULL,
3009         };
3010         int status = -EPERM;
3011         size_t i;
3012
3013         if (server->auth_info.flavor_len > 0) {
3014                 /* try each flavor specified by user */
3015                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3016                         status = nfs4_lookup_root_sec(server, fhandle, info,
3017                                                 server->auth_info.flavors[i]);
3018                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3019                                 continue;
3020                         break;
3021                 }
3022         } else {
3023                 /* no flavors specified by user, try default list */
3024                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3025                         status = nfs4_lookup_root_sec(server, fhandle, info,
3026                                                       flav_array[i]);
3027                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3028                                 continue;
3029                         break;
3030                 }
3031         }
3032
3033         /*
3034          * -EACCESS could mean that the user doesn't have correct permissions
3035          * to access the mount.  It could also mean that we tried to mount
3036          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3037          * existing mount programs don't handle -EACCES very well so it should
3038          * be mapped to -EPERM instead.
3039          */
3040         if (status == -EACCES)
3041                 status = -EPERM;
3042         return status;
3043 }
3044
3045 static int nfs4_do_find_root_sec(struct nfs_server *server,
3046                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3047 {
3048         int mv = server->nfs_client->cl_minorversion;
3049         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3050 }
3051
3052 /**
3053  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3054  * @server: initialized nfs_server handle
3055  * @fhandle: we fill in the pseudo-fs root file handle
3056  * @info: we fill in an FSINFO struct
3057  * @auth_probe: probe the auth flavours
3058  *
3059  * Returns zero on success, or a negative errno.
3060  */
3061 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3062                          struct nfs_fsinfo *info,
3063                          bool auth_probe)
3064 {
3065         int status;
3066
3067         switch (auth_probe) {
3068         case false:
3069                 status = nfs4_lookup_root(server, fhandle, info);
3070                 if (status != -NFS4ERR_WRONGSEC)
3071                         break;
3072         default:
3073                 status = nfs4_do_find_root_sec(server, fhandle, info);
3074         }
3075
3076         if (status == 0)
3077                 status = nfs4_server_capabilities(server, fhandle);
3078         if (status == 0)
3079                 status = nfs4_do_fsinfo(server, fhandle, info);
3080
3081         return nfs4_map_errors(status);
3082 }
3083
3084 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3085                               struct nfs_fsinfo *info)
3086 {
3087         int error;
3088         struct nfs_fattr *fattr = info->fattr;
3089         struct nfs4_label *label = NULL;
3090
3091         error = nfs4_server_capabilities(server, mntfh);
3092         if (error < 0) {
3093                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3094                 return error;
3095         }
3096
3097         label = nfs4_label_alloc(server, GFP_KERNEL);
3098         if (IS_ERR(label))
3099                 return PTR_ERR(label);
3100
3101         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3102         if (error < 0) {
3103                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3104                 goto err_free_label;
3105         }
3106
3107         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3108             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3109                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3110
3111 err_free_label:
3112         nfs4_label_free(label);
3113
3114         return error;
3115 }
3116
3117 /*
3118  * Get locations and (maybe) other attributes of a referral.
3119  * Note that we'll actually follow the referral later when
3120  * we detect fsid mismatch in inode revalidation
3121  */
3122 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3123                              const struct qstr *name, struct nfs_fattr *fattr,
3124                              struct nfs_fh *fhandle)
3125 {
3126         int status = -ENOMEM;
3127         struct page *page = NULL;
3128         struct nfs4_fs_locations *locations = NULL;
3129
3130         page = alloc_page(GFP_KERNEL);
3131         if (page == NULL)
3132                 goto out;
3133         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3134         if (locations == NULL)
3135                 goto out;
3136
3137         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3138         if (status != 0)
3139                 goto out;
3140
3141         /*
3142          * If the fsid didn't change, this is a migration event, not a
3143          * referral.  Cause us to drop into the exception handler, which
3144          * will kick off migration recovery.
3145          */
3146         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3147                 dprintk("%s: server did not return a different fsid for"
3148                         " a referral at %s\n", __func__, name->name);
3149                 status = -NFS4ERR_MOVED;
3150                 goto out;
3151         }
3152         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3153         nfs_fixup_referral_attributes(&locations->fattr);
3154
3155         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3156         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3157         memset(fhandle, 0, sizeof(struct nfs_fh));
3158 out:
3159         if (page)
3160                 __free_page(page);
3161         kfree(locations);
3162         return status;
3163 }
3164
3165 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3166                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3167 {
3168         struct nfs4_getattr_arg args = {
3169                 .fh = fhandle,
3170                 .bitmask = server->attr_bitmask,
3171         };
3172         struct nfs4_getattr_res res = {
3173                 .fattr = fattr,
3174                 .label = label,
3175                 .server = server,
3176         };
3177         struct rpc_message msg = {
3178                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3179                 .rpc_argp = &args,
3180                 .rpc_resp = &res,
3181         };
3182
3183         args.bitmask = nfs4_bitmask(server, label);
3184
3185         nfs_fattr_init(fattr);
3186         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3187 }
3188
3189 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3190                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3191 {
3192         struct nfs4_exception exception = { };
3193         int err;
3194         do {
3195                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3196                 trace_nfs4_getattr(server, fhandle, fattr, err);
3197                 err = nfs4_handle_exception(server, err,
3198                                 &exception);
3199         } while (exception.retry);
3200         return err;
3201 }
3202
3203 /*
3204  * The file is not closed if it is opened due to the a request to change
3205  * the size of the file. The open call will not be needed once the
3206  * VFS layer lookup-intents are implemented.
3207  *
3208  * Close is called when the inode is destroyed.
3209  * If we haven't opened the file for O_WRONLY, we
3210  * need to in the size_change case to obtain a stateid.
3211  *
3212  * Got race?
3213  * Because OPEN is always done by name in nfsv4, it is
3214  * possible that we opened a different file by the same
3215  * name.  We can recognize this race condition, but we
3216  * can't do anything about it besides returning an error.
3217  *
3218  * This will be fixed with VFS changes (lookup-intent).
3219  */
3220 static int
3221 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3222                   struct iattr *sattr)
3223 {
3224         struct inode *inode = dentry->d_inode;
3225         struct rpc_cred *cred = NULL;
3226         struct nfs4_state *state = NULL;
3227         struct nfs4_label *label = NULL;
3228         int status;
3229
3230         if (pnfs_ld_layoutret_on_setattr(inode) &&
3231             sattr->ia_valid & ATTR_SIZE &&
3232             sattr->ia_size < i_size_read(inode))
3233                 pnfs_commit_and_return_layout(inode);
3234
3235         nfs_fattr_init(fattr);
3236
3237         /* Deal with open(O_TRUNC) */
3238         if (sattr->ia_valid & ATTR_OPEN)
3239                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3240
3241         /* Optimization: if the end result is no change, don't RPC */
3242         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3243                 return 0;
3244
3245         /* Search for an existing open(O_WRITE) file */
3246         if (sattr->ia_valid & ATTR_FILE) {
3247                 struct nfs_open_context *ctx;
3248
3249                 ctx = nfs_file_open_context(sattr->ia_file);
3250                 if (ctx) {
3251                         cred = ctx->cred;
3252                         state = ctx->state;
3253                 }
3254         }
3255
3256         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3257         if (IS_ERR(label))
3258                 return PTR_ERR(label);
3259
3260         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3261         if (status == 0) {
3262                 nfs_setattr_update_inode(inode, sattr);
3263                 nfs_setsecurity(inode, fattr, label);
3264         }
3265         nfs4_label_free(label);
3266         return status;
3267 }
3268
3269 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3270                 const struct qstr *name, struct nfs_fh *fhandle,
3271                 struct nfs_fattr *fattr, struct nfs4_label *label)
3272 {
3273         struct nfs_server *server = NFS_SERVER(dir);
3274         int                    status;
3275         struct nfs4_lookup_arg args = {
3276                 .bitmask = server->attr_bitmask,
3277                 .dir_fh = NFS_FH(dir),
3278                 .name = name,
3279         };
3280         struct nfs4_lookup_res res = {
3281                 .server = server,
3282                 .fattr = fattr,
3283                 .label = label,
3284                 .fh = fhandle,
3285         };
3286         struct rpc_message msg = {
3287                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3288                 .rpc_argp = &args,
3289                 .rpc_resp = &res,
3290         };
3291
3292         args.bitmask = nfs4_bitmask(server, label);
3293
3294         nfs_fattr_init(fattr);
3295
3296         dprintk("NFS call  lookup %s\n", name->name);
3297         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3298         dprintk("NFS reply lookup: %d\n", status);
3299         return status;
3300 }
3301
3302 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3303 {
3304         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3305                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3306         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3307         fattr->nlink = 2;
3308 }
3309
3310 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3311                                    struct qstr *name, struct nfs_fh *fhandle,
3312                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3313 {
3314         struct nfs4_exception exception = { };
3315         struct rpc_clnt *client = *clnt;
3316         int err;
3317         do {
3318                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3319                 trace_nfs4_lookup(dir, name, err);
3320                 switch (err) {
3321                 case -NFS4ERR_BADNAME:
3322                         err = -ENOENT;
3323                         goto out;
3324                 case -NFS4ERR_MOVED:
3325                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3326                         goto out;
3327                 case -NFS4ERR_WRONGSEC:
3328                         err = -EPERM;
3329                         if (client != *clnt)
3330                                 goto out;
3331                         client = nfs4_negotiate_security(client, dir, name);
3332                         if (IS_ERR(client))
3333                                 return PTR_ERR(client);
3334
3335                         exception.retry = 1;
3336                         break;
3337                 default:
3338                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3339                 }
3340         } while (exception.retry);
3341
3342 out:
3343         if (err == 0)
3344                 *clnt = client;
3345         else if (client != *clnt)
3346                 rpc_shutdown_client(client);
3347
3348         return err;
3349 }
3350
3351 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3352                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3353                             struct nfs4_label *label)
3354 {
3355         int status;
3356         struct rpc_clnt *client = NFS_CLIENT(dir);
3357
3358         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3359         if (client != NFS_CLIENT(dir)) {
3360                 rpc_shutdown_client(client);
3361                 nfs_fixup_secinfo_attributes(fattr);
3362         }
3363         return status;
3364 }
3365
3366 struct rpc_clnt *
3367 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3368                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3369 {
3370         struct rpc_clnt *client = NFS_CLIENT(dir);
3371         int status;
3372
3373         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3374         if (status < 0)
3375                 return ERR_PTR(status);
3376         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3377 }
3378
3379 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3380 {
3381         struct nfs_server *server = NFS_SERVER(inode);
3382         struct nfs4_accessargs args = {
3383                 .fh = NFS_FH(inode),
3384                 .bitmask = server->cache_consistency_bitmask,
3385         };
3386         struct nfs4_accessres res = {
3387                 .server = server,
3388         };
3389         struct rpc_message msg = {
3390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3391                 .rpc_argp = &args,
3392                 .rpc_resp = &res,
3393                 .rpc_cred = entry->cred,
3394         };
3395         int mode = entry->mask;
3396         int status = 0;
3397
3398         /*
3399          * Determine which access bits we want to ask for...
3400          */
3401         if (mode & MAY_READ)
3402                 args.access |= NFS4_ACCESS_READ;
3403         if (S_ISDIR(inode->i_mode)) {
3404                 if (mode & MAY_WRITE)
3405                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3406                 if (mode & MAY_EXEC)
3407                         args.access |= NFS4_ACCESS_LOOKUP;
3408         } else {
3409                 if (mode & MAY_WRITE)
3410                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3411                 if (mode & MAY_EXEC)
3412                         args.access |= NFS4_ACCESS_EXECUTE;
3413         }
3414
3415         res.fattr = nfs_alloc_fattr();
3416         if (res.fattr == NULL)
3417                 return -ENOMEM;
3418
3419         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3420         if (!status) {
3421                 nfs_access_set_mask(entry, res.access);
3422                 nfs_refresh_inode(inode, res.fattr);
3423         }
3424         nfs_free_fattr(res.fattr);
3425         return status;
3426 }
3427
3428 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3429 {
3430         struct nfs4_exception exception = { };
3431         int err;
3432         do {
3433                 err = _nfs4_proc_access(inode, entry);
3434                 trace_nfs4_access(inode, err);
3435                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3436                                 &exception);
3437         } while (exception.retry);
3438         return err;
3439 }
3440
3441 /*
3442  * TODO: For the time being, we don't try to get any attributes
3443  * along with any of the zero-copy operations READ, READDIR,
3444  * READLINK, WRITE.
3445  *
3446  * In the case of the first three, we want to put the GETATTR
3447  * after the read-type operation -- this is because it is hard
3448  * to predict the length of a GETATTR response in v4, and thus
3449  * align the READ data correctly.  This means that the GETATTR
3450  * may end up partially falling into the page cache, and we should
3451  * shift it into the 'tail' of the xdr_buf before processing.
3452  * To do this efficiently, we need to know the total length
3453  * of data received, which doesn't seem to be available outside
3454  * of the RPC layer.
3455  *
3456  * In the case of WRITE, we also want to put the GETATTR after
3457  * the operation -- in this case because we want to make sure
3458  * we get the post-operation mtime and size.
3459  *
3460  * Both of these changes to the XDR layer would in fact be quite
3461  * minor, but I decided to leave them for a subsequent patch.
3462  */
3463 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3464                 unsigned int pgbase, unsigned int pglen)
3465 {
3466         struct nfs4_readlink args = {
3467                 .fh       = NFS_FH(inode),
3468                 .pgbase   = pgbase,
3469                 .pglen    = pglen,
3470                 .pages    = &page,
3471         };
3472         struct nfs4_readlink_res res;
3473         struct rpc_message msg = {
3474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3475                 .rpc_argp = &args,
3476                 .rpc_resp = &res,
3477         };
3478
3479         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3480 }
3481
3482 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3483                 unsigned int pgbase, unsigned int pglen)
3484 {
3485         struct nfs4_exception exception = { };
3486         int err;
3487         do {
3488                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3489                 trace_nfs4_readlink(inode, err);
3490                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3491                                 &exception);
3492         } while (exception.retry);
3493         return err;
3494 }
3495
3496 /*
3497  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3498  */
3499 static int
3500 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3501                  int flags)
3502 {
3503         struct nfs4_label l, *ilabel = NULL;
3504         struct nfs_open_context *ctx;
3505         struct nfs4_state *state;
3506         int opened = 0;
3507         int status = 0;
3508
3509         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3510         if (IS_ERR(ctx))
3511                 return PTR_ERR(ctx);
3512
3513         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3514
3515         sattr->ia_mode &= ~current_umask();
3516         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3517         if (IS_ERR(state)) {
3518                 status = PTR_ERR(state);
3519                 goto out;
3520         }
3521 out:
3522         nfs4_label_release_security(ilabel);
3523         put_nfs_open_context(ctx);
3524         return status;
3525 }
3526
3527 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3528 {
3529         struct nfs_server *server = NFS_SERVER(dir);
3530         struct nfs_removeargs args = {
3531                 .fh = NFS_FH(dir),
3532                 .name = *name,
3533         };
3534         struct nfs_removeres res = {
3535                 .server = server,
3536         };
3537         struct rpc_message msg = {
3538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3539                 .rpc_argp = &args,
3540                 .rpc_resp = &res,
3541         };
3542         int status;
3543
3544         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3545         if (status == 0)
3546                 update_changeattr(dir, &res.cinfo);
3547         return status;
3548 }
3549
3550 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3551 {
3552         struct nfs4_exception exception = { };
3553         int err;
3554         do {
3555                 err = _nfs4_proc_remove(dir, name);
3556                 trace_nfs4_remove(dir, name, err);
3557                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3558                                 &exception);
3559         } while (exception.retry);
3560         return err;
3561 }
3562
3563 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3564 {
3565         struct nfs_server *server = NFS_SERVER(dir);
3566         struct nfs_removeargs *args = msg->rpc_argp;
3567         struct nfs_removeres *res = msg->rpc_resp;
3568
3569         res->server = server;
3570         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3571         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3572
3573         nfs_fattr_init(res->dir_attr);
3574 }
3575
3576 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3577 {
3578         nfs4_setup_sequence(NFS_SERVER(data->dir),
3579                         &data->args.seq_args,
3580                         &data->res.seq_res,
3581                         task);
3582 }
3583
3584 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3585 {
3586         struct nfs_unlinkdata *data = task->tk_calldata;
3587         struct nfs_removeres *res = &data->res;
3588
3589         if (!nfs4_sequence_done(task, &res->seq_res))
3590                 return 0;
3591         if (nfs4_async_handle_error(task, res->server, NULL,
3592                                     &data->timeout) == -EAGAIN)
3593                 return 0;
3594         update_changeattr(dir, &res->cinfo);
3595         return 1;
3596 }
3597
3598 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3599 {
3600         struct nfs_server *server = NFS_SERVER(dir);
3601         struct nfs_renameargs *arg = msg->rpc_argp;
3602         struct nfs_renameres *res = msg->rpc_resp;
3603
3604         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3605         res->server = server;
3606         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3607 }
3608
3609 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3610 {
3611         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3612                         &data->args.seq_args,
3613                         &data->res.seq_res,
3614                         task);
3615 }
3616
3617 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3618                                  struct inode *new_dir)
3619 {
3620         struct nfs_renamedata *data = task->tk_calldata;
3621         struct nfs_renameres *res = &data->res;
3622
3623         if (!nfs4_sequence_done(task, &res->seq_res))
3624                 return 0;
3625         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3626                 return 0;
3627
3628         update_changeattr(old_dir, &res->old_cinfo);
3629         update_changeattr(new_dir, &res->new_cinfo);
3630         return 1;
3631 }
3632
3633 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3634 {
3635         struct nfs_server *server = NFS_SERVER(inode);
3636         struct nfs4_link_arg arg = {
3637                 .fh     = NFS_FH(inode),
3638                 .dir_fh = NFS_FH(dir),
3639                 .name   = name,
3640                 .bitmask = server->attr_bitmask,
3641         };
3642         struct nfs4_link_res res = {
3643                 .server = server,
3644                 .label = NULL,
3645         };
3646         struct rpc_message msg = {
3647                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3648                 .rpc_argp = &arg,
3649                 .rpc_resp = &res,
3650         };
3651         int status = -ENOMEM;
3652
3653         res.fattr = nfs_alloc_fattr();
3654         if (res.fattr == NULL)
3655                 goto out;
3656
3657         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3658         if (IS_ERR(res.label)) {
3659                 status = PTR_ERR(res.label);
3660                 goto out;
3661         }
3662         arg.bitmask = nfs4_bitmask(server, res.label);
3663
3664         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3665         if (!status) {
3666                 update_changeattr(dir, &res.cinfo);
3667                 status = nfs_post_op_update_inode(inode, res.fattr);
3668                 if (!status)
3669                         nfs_setsecurity(inode, res.fattr, res.label);
3670         }
3671
3672
3673         nfs4_label_free(res.label);
3674
3675 out:
3676         nfs_free_fattr(res.fattr);
3677         return status;
3678 }
3679
3680 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3681 {
3682         struct nfs4_exception exception = { };
3683         int err;
3684         do {
3685                 err = nfs4_handle_exception(NFS_SERVER(inode),
3686                                 _nfs4_proc_link(inode, dir, name),
3687                                 &exception);
3688         } while (exception.retry);
3689         return err;
3690 }
3691
3692 struct nfs4_createdata {
3693         struct rpc_message msg;
3694         struct nfs4_create_arg arg;
3695         struct nfs4_create_res res;
3696         struct nfs_fh fh;
3697         struct nfs_fattr fattr;
3698         struct nfs4_label *label;
3699 };
3700
3701 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3702                 struct qstr *name, struct iattr *sattr, u32 ftype)
3703 {
3704         struct nfs4_createdata *data;
3705
3706         data = kzalloc(sizeof(*data), GFP_KERNEL);
3707         if (data != NULL) {
3708                 struct nfs_server *server = NFS_SERVER(dir);
3709
3710                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3711                 if (IS_ERR(data->label))
3712                         goto out_free;
3713
3714                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3715                 data->msg.rpc_argp = &data->arg;
3716                 data->msg.rpc_resp = &data->res;
3717                 data->arg.dir_fh = NFS_FH(dir);
3718                 data->arg.server = server;
3719                 data->arg.name = name;
3720                 data->arg.attrs = sattr;
3721                 data->arg.ftype = ftype;
3722                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3723                 data->res.server = server;
3724                 data->res.fh = &data->fh;
3725                 data->res.fattr = &data->fattr;
3726                 data->res.label = data->label;
3727                 nfs_fattr_init(data->res.fattr);
3728         }
3729         return data;
3730 out_free:
3731         kfree(data);
3732         return NULL;
3733 }
3734
3735 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3736 {
3737         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3738                                     &data->arg.seq_args, &data->res.seq_res, 1);
3739         if (status == 0) {
3740                 update_changeattr(dir, &data->res.dir_cinfo);
3741                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3742         }
3743         return status;
3744 }
3745
3746 static void nfs4_free_createdata(struct nfs4_createdata *data)
3747 {
3748         nfs4_label_free(data->label);
3749         kfree(data);
3750 }
3751
3752 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3753                 struct page *page, unsigned int len, struct iattr *sattr,
3754                 struct nfs4_label *label)
3755 {
3756         struct nfs4_createdata *data;
3757         int status = -ENAMETOOLONG;
3758
3759         if (len > NFS4_MAXPATHLEN)
3760                 goto out;
3761
3762         status = -ENOMEM;
3763         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3764         if (data == NULL)
3765                 goto out;
3766
3767         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3768         data->arg.u.symlink.pages = &page;
3769         data->arg.u.symlink.len = len;
3770         data->arg.label = label;
3771
3772         status = nfs4_do_create(dir, dentry, data);
3773
3774         nfs4_free_createdata(data);
3775 out:
3776         return status;
3777 }
3778
3779 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3780                 struct page *page, unsigned int len, struct iattr *sattr)
3781 {
3782         struct nfs4_exception exception = { };
3783         struct nfs4_label l, *label = NULL;
3784         int err;
3785
3786         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3787
3788         do {
3789                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3790                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3791                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3792                                 &exception);
3793         } while (exception.retry);
3794
3795         nfs4_label_release_security(label);
3796         return err;
3797 }
3798
3799 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3800                 struct iattr *sattr, struct nfs4_label *label)
3801 {
3802         struct nfs4_createdata *data;
3803         int status = -ENOMEM;
3804
3805         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3806         if (data == NULL)
3807                 goto out;
3808
3809         data->arg.label = label;
3810         status = nfs4_do_create(dir, dentry, data);
3811
3812         nfs4_free_createdata(data);
3813 out:
3814         return status;
3815 }
3816
3817 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3818                 struct iattr *sattr)
3819 {
3820         struct nfs4_exception exception = { };
3821         struct nfs4_label l, *label = NULL;
3822         int err;
3823
3824         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3825
3826         sattr->ia_mode &= ~current_umask();
3827         do {
3828                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3829                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3830                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3831                                 &exception);
3832         } while (exception.retry);
3833         nfs4_label_release_security(label);
3834
3835         return err;
3836 }
3837
3838 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3839                 u64 cookie, struct page **pages, unsigned int count, int plus)
3840 {
3841         struct inode            *dir = dentry->d_inode;
3842         struct nfs4_readdir_arg args = {
3843                 .fh = NFS_FH(dir),
3844                 .pages = pages,
3845                 .pgbase = 0,
3846                 .count = count,
3847                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3848                 .plus = plus,
3849         };
3850         struct nfs4_readdir_res res;
3851         struct rpc_message msg = {
3852                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3853                 .rpc_argp = &args,
3854                 .rpc_resp = &res,
3855                 .rpc_cred = cred,
3856         };
3857         int                     status;
3858
3859         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3860                         dentry,
3861                         (unsigned long long)cookie);
3862         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3863         res.pgbase = args.pgbase;
3864         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3865         if (status >= 0) {
3866                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3867                 status += args.pgbase;
3868         }
3869
3870         nfs_invalidate_atime(dir);
3871
3872         dprintk("%s: returns %d\n", __func__, status);
3873         return status;
3874 }
3875
3876 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3877                 u64 cookie, struct page **pages, unsigned int count, int plus)
3878 {
3879         struct nfs4_exception exception = { };
3880         int err;
3881         do {
3882                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3883                                 pages, count, plus);
3884                 trace_nfs4_readdir(dentry->d_inode, err);
3885                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3886                                 &exception);
3887         } while (exception.retry);
3888         return err;
3889 }
3890
3891 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3892                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3893 {
3894         struct nfs4_createdata *data;
3895         int mode = sattr->ia_mode;
3896         int status = -ENOMEM;
3897
3898         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3899         if (data == NULL)
3900                 goto out;
3901
3902         if (S_ISFIFO(mode))
3903                 data->arg.ftype = NF4FIFO;
3904         else if (S_ISBLK(mode)) {
3905                 data->arg.ftype = NF4BLK;
3906                 data->arg.u.device.specdata1 = MAJOR(rdev);
3907                 data->arg.u.device.specdata2 = MINOR(rdev);
3908         }
3909         else if (S_ISCHR(mode)) {
3910                 data->arg.ftype = NF4CHR;
3911                 data->arg.u.device.specdata1 = MAJOR(rdev);
3912                 data->arg.u.device.specdata2 = MINOR(rdev);
3913         } else if (!S_ISSOCK(mode)) {
3914                 status = -EINVAL;
3915                 goto out_free;
3916         }
3917
3918         data->arg.label = label;
3919         status = nfs4_do_create(dir, dentry, data);
3920 out_free:
3921         nfs4_free_createdata(data);
3922 out:
3923         return status;
3924 }
3925
3926 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3927                 struct iattr *sattr, dev_t rdev)
3928 {
3929         struct nfs4_exception exception = { };
3930         struct nfs4_label l, *label = NULL;
3931         int err;
3932
3933         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3934
3935         sattr->ia_mode &= ~current_umask();
3936         do {
3937                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3938                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3939                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3940                                 &exception);
3941         } while (exception.retry);
3942
3943         nfs4_label_release_security(label);
3944
3945         return err;
3946 }
3947
3948 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3949                  struct nfs_fsstat *fsstat)
3950 {
3951         struct nfs4_statfs_arg args = {
3952                 .fh = fhandle,
3953                 .bitmask = server->attr_bitmask,
3954         };
3955         struct nfs4_statfs_res res = {
3956                 .fsstat = fsstat,
3957         };
3958         struct rpc_message msg = {
3959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3960                 .rpc_argp = &args,
3961                 .rpc_resp = &res,
3962         };
3963
3964         nfs_fattr_init(fsstat->fattr);
3965         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3966 }
3967
3968 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3969 {
3970         struct nfs4_exception exception = { };
3971         int err;
3972         do {
3973                 err = nfs4_handle_exception(server,
3974                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3975                                 &exception);
3976         } while (exception.retry);
3977         return err;
3978 }
3979
3980 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3981                 struct nfs_fsinfo *fsinfo)
3982 {
3983         struct nfs4_fsinfo_arg args = {
3984                 .fh = fhandle,
3985                 .bitmask = server->attr_bitmask,
3986         };
3987         struct nfs4_fsinfo_res res = {
3988                 .fsinfo = fsinfo,
3989         };
3990         struct rpc_message msg = {
3991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3992                 .rpc_argp = &args,
3993                 .rpc_resp = &res,
3994         };
3995
3996         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3997 }
3998
3999 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4000 {
4001         struct nfs4_exception exception = { };
4002         unsigned long now = jiffies;
4003         int err;
4004
4005         do {
4006                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4007                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4008                 if (err == 0) {
4009                         struct nfs_client *clp = server->nfs_client;
4010
4011                         spin_lock(&clp->cl_lock);
4012                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4013                         clp->cl_last_renewal = now;
4014                         spin_unlock(&clp->cl_lock);
4015                         break;
4016                 }
4017                 err = nfs4_handle_exception(server, err, &exception);
4018         } while (exception.retry);
4019         return err;
4020 }
4021
4022 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4023 {
4024         int error;
4025
4026         nfs_fattr_init(fsinfo->fattr);
4027         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4028         if (error == 0) {
4029                 /* block layout checks this! */
4030                 server->pnfs_blksize = fsinfo->blksize;
4031                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4032         }
4033
4034         return error;
4035 }
4036
4037 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4038                 struct nfs_pathconf *pathconf)
4039 {
4040         struct nfs4_pathconf_arg args = {
4041                 .fh = fhandle,
4042                 .bitmask = server->attr_bitmask,
4043         };
4044         struct nfs4_pathconf_res res = {
4045                 .pathconf = pathconf,
4046         };
4047         struct rpc_message msg = {
4048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4049                 .rpc_argp = &args,
4050                 .rpc_resp = &res,
4051         };
4052
4053         /* None of the pathconf attributes are mandatory to implement */
4054         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4055                 memset(pathconf, 0, sizeof(*pathconf));
4056                 return 0;
4057         }
4058
4059         nfs_fattr_init(pathconf->fattr);
4060         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4061 }
4062
4063 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4064                 struct nfs_pathconf *pathconf)
4065 {
4066         struct nfs4_exception exception = { };
4067         int err;
4068
4069         do {
4070                 err = nfs4_handle_exception(server,
4071                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4072                                 &exception);
4073         } while (exception.retry);
4074         return err;
4075 }
4076
4077 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4078                 const struct nfs_open_context *ctx,
4079                 const struct nfs_lock_context *l_ctx,
4080                 fmode_t fmode)
4081 {
4082         const struct nfs_lockowner *lockowner = NULL;
4083
4084         if (l_ctx != NULL)
4085                 lockowner = &l_ctx->lockowner;
4086         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4087 }
4088 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4089
4090 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4091                 const struct nfs_open_context *ctx,
4092                 const struct nfs_lock_context *l_ctx,
4093                 fmode_t fmode)
4094 {
4095         nfs4_stateid current_stateid;
4096
4097         /* If the current stateid represents a lost lock, then exit */
4098         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4099                 return true;
4100         return nfs4_stateid_match(stateid, &current_stateid);
4101 }
4102
4103 static bool nfs4_error_stateid_expired(int err)
4104 {
4105         switch (err) {
4106         case -NFS4ERR_DELEG_REVOKED:
4107         case -NFS4ERR_ADMIN_REVOKED:
4108         case -NFS4ERR_BAD_STATEID:
4109         case -NFS4ERR_STALE_STATEID:
4110         case -NFS4ERR_OLD_STATEID:
4111         case -NFS4ERR_OPENMODE:
4112         case -NFS4ERR_EXPIRED:
4113                 return true;
4114         }
4115         return false;
4116 }
4117
4118 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4119 {
4120         nfs_invalidate_atime(hdr->inode);
4121 }
4122
4123 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4124 {
4125         struct nfs_server *server = NFS_SERVER(hdr->inode);
4126
4127         trace_nfs4_read(hdr, task->tk_status);
4128         if (nfs4_async_handle_error(task, server,
4129                                     hdr->args.context->state,
4130                                     NULL) == -EAGAIN) {
4131                 rpc_restart_call_prepare(task);
4132                 return -EAGAIN;
4133         }
4134
4135         __nfs4_read_done_cb(hdr);
4136         if (task->tk_status > 0)
4137                 renew_lease(server, hdr->timestamp);
4138         return 0;
4139 }
4140
4141 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4142                 struct nfs_pgio_args *args)
4143 {
4144
4145         if (!nfs4_error_stateid_expired(task->tk_status) ||
4146                 nfs4_stateid_is_current(&args->stateid,
4147                                 args->context,
4148                                 args->lock_context,
4149                                 FMODE_READ))
4150                 return false;
4151         rpc_restart_call_prepare(task);
4152         return true;
4153 }
4154
4155 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4156 {
4157
4158         dprintk("--> %s\n", __func__);
4159
4160         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4161                 return -EAGAIN;
4162         if (nfs4_read_stateid_changed(task, &hdr->args))
4163                 return -EAGAIN;
4164         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4165                                     nfs4_read_done_cb(task, hdr);
4166 }
4167
4168 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4169                                  struct rpc_message *msg)
4170 {
4171         hdr->timestamp   = jiffies;
4172         hdr->pgio_done_cb = nfs4_read_done_cb;
4173         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4174         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4175 }
4176
4177 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4178                                       struct nfs_pgio_header *hdr)
4179 {
4180         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4181                         &hdr->args.seq_args,
4182                         &hdr->res.seq_res,
4183                         task))
4184                 return 0;
4185         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4186                                 hdr->args.lock_context,
4187                                 hdr->rw_ops->rw_mode) == -EIO)
4188                 return -EIO;
4189         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4190                 return -EIO;
4191         return 0;
4192 }
4193
4194 static int nfs4_write_done_cb(struct rpc_task *task,
4195                               struct nfs_pgio_header *hdr)
4196 {
4197         struct inode *inode = hdr->inode;
4198
4199         trace_nfs4_write(hdr, task->tk_status);
4200         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4201                                     hdr->args.context->state,
4202                                     NULL) == -EAGAIN) {
4203                 rpc_restart_call_prepare(task);
4204                 return -EAGAIN;
4205         }
4206         if (task->tk_status >= 0) {
4207                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4208                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4209         }
4210         return 0;
4211 }
4212
4213 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4214                 struct nfs_pgio_args *args)
4215 {
4216
4217         if (!nfs4_error_stateid_expired(task->tk_status) ||
4218                 nfs4_stateid_is_current(&args->stateid,
4219                                 args->context,
4220                                 args->lock_context,
4221                                 FMODE_WRITE))
4222                 return false;
4223         rpc_restart_call_prepare(task);
4224         return true;
4225 }
4226
4227 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4228 {
4229         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4230                 return -EAGAIN;
4231         if (nfs4_write_stateid_changed(task, &hdr->args))
4232                 return -EAGAIN;
4233         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4234                 nfs4_write_done_cb(task, hdr);
4235 }
4236
4237 static
4238 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4239 {
4240         /* Don't request attributes for pNFS or O_DIRECT writes */
4241         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4242                 return false;
4243         /* Otherwise, request attributes if and only if we don't hold
4244          * a delegation
4245          */
4246         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4247 }
4248
4249 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4250                                   struct rpc_message *msg)
4251 {
4252         struct nfs_server *server = NFS_SERVER(hdr->inode);
4253
4254         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4255                 hdr->args.bitmask = NULL;
4256                 hdr->res.fattr = NULL;
4257         } else
4258                 hdr->args.bitmask = server->cache_consistency_bitmask;
4259
4260         if (!hdr->pgio_done_cb)
4261                 hdr->pgio_done_cb = nfs4_write_done_cb;
4262         hdr->res.server = server;
4263         hdr->timestamp   = jiffies;
4264
4265         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4266         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4267 }
4268
4269 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4270 {
4271         nfs4_setup_sequence(NFS_SERVER(data->inode),
4272                         &data->args.seq_args,
4273                         &data->res.seq_res,
4274                         task);
4275 }
4276
4277 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4278 {
4279         struct inode *inode = data->inode;
4280
4281         trace_nfs4_commit(data, task->tk_status);
4282         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4283                                     NULL, NULL) == -EAGAIN) {
4284                 rpc_restart_call_prepare(task);
4285                 return -EAGAIN;
4286         }
4287         return 0;
4288 }
4289
4290 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4291 {
4292         if (!nfs4_sequence_done(task, &data->res.seq_res))
4293                 return -EAGAIN;
4294         return data->commit_done_cb(task, data);
4295 }
4296
4297 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4298 {
4299         struct nfs_server *server = NFS_SERVER(data->inode);
4300
4301         if (data->commit_done_cb == NULL)
4302                 data->commit_done_cb = nfs4_commit_done_cb;
4303         data->res.server = server;
4304         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4305         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4306 }
4307
4308 struct nfs4_renewdata {
4309         struct nfs_client       *client;
4310         unsigned long           timestamp;
4311 };
4312
4313 /*
4314  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4315  * standalone procedure for queueing an asynchronous RENEW.
4316  */
4317 static void nfs4_renew_release(void *calldata)
4318 {
4319         struct nfs4_renewdata *data = calldata;
4320         struct nfs_client *clp = data->client;
4321
4322         if (atomic_read(&clp->cl_count) > 1)
4323                 nfs4_schedule_state_renewal(clp);
4324         nfs_put_client(clp);
4325         kfree(data);
4326 }
4327
4328 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4329 {
4330         struct nfs4_renewdata *data = calldata;
4331         struct nfs_client *clp = data->client;
4332         unsigned long timestamp = data->timestamp;
4333
4334         trace_nfs4_renew_async(clp, task->tk_status);
4335         switch (task->tk_status) {
4336         case 0:
4337                 break;
4338         case -NFS4ERR_LEASE_MOVED:
4339                 nfs4_schedule_lease_moved_recovery(clp);
4340                 break;
4341         default:
4342                 /* Unless we're shutting down, schedule state recovery! */
4343                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4344                         return;
4345                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4346                         nfs4_schedule_lease_recovery(clp);
4347                         return;
4348                 }
4349                 nfs4_schedule_path_down_recovery(clp);
4350         }
4351         do_renew_lease(clp, timestamp);
4352 }
4353
4354 static const struct rpc_call_ops nfs4_renew_ops = {
4355         .rpc_call_done = nfs4_renew_done,
4356         .rpc_release = nfs4_renew_release,
4357 };
4358
4359 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4360 {
4361         struct rpc_message msg = {
4362                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4363                 .rpc_argp       = clp,
4364                 .rpc_cred       = cred,
4365         };
4366         struct nfs4_renewdata *data;
4367
4368         if (renew_flags == 0)
4369                 return 0;
4370         if (!atomic_inc_not_zero(&clp->cl_count))
4371                 return -EIO;
4372         data = kmalloc(sizeof(*data), GFP_NOFS);
4373         if (data == NULL)
4374                 return -ENOMEM;
4375         data->client = clp;
4376         data->timestamp = jiffies;
4377         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4378                         &nfs4_renew_ops, data);
4379 }
4380
4381 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4382 {
4383         struct rpc_message msg = {
4384                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4385                 .rpc_argp       = clp,
4386                 .rpc_cred       = cred,
4387         };
4388         unsigned long now = jiffies;
4389         int status;
4390
4391         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4392         if (status < 0)
4393                 return status;
4394         do_renew_lease(clp, now);
4395         return 0;
4396 }
4397
4398 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4399 {
4400         return server->caps & NFS_CAP_ACLS;
4401 }
4402
4403 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4404  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4405  * the stack.
4406  */
4407 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4408
4409 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4410                 struct page **pages, unsigned int *pgbase)
4411 {
4412         struct page *newpage, **spages;
4413         int rc = 0;
4414         size_t len;
4415         spages = pages;
4416
4417         do {
4418                 len = min_t(size_t, PAGE_SIZE, buflen);
4419                 newpage = alloc_page(GFP_KERNEL);
4420
4421                 if (newpage == NULL)
4422                         goto unwind;
4423                 memcpy(page_address(newpage), buf, len);
4424                 buf += len;
4425                 buflen -= len;
4426                 *pages++ = newpage;
4427                 rc++;
4428         } while (buflen != 0);
4429
4430         return rc;
4431
4432 unwind:
4433         for(; rc > 0; rc--)
4434                 __free_page(spages[rc-1]);
4435         return -ENOMEM;
4436 }
4437
4438 struct nfs4_cached_acl {
4439         int cached;
4440         size_t len;
4441         char data[0];
4442 };
4443
4444 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4445 {
4446         struct nfs_inode *nfsi = NFS_I(inode);
4447
4448         spin_lock(&inode->i_lock);
4449         kfree(nfsi->nfs4_acl);
4450         nfsi->nfs4_acl = acl;
4451         spin_unlock(&inode->i_lock);
4452 }
4453
4454 static void nfs4_zap_acl_attr(struct inode *inode)
4455 {
4456         nfs4_set_cached_acl(inode, NULL);
4457 }
4458
4459 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4460 {
4461         struct nfs_inode *nfsi = NFS_I(inode);
4462         struct nfs4_cached_acl *acl;
4463         int ret = -ENOENT;
4464
4465         spin_lock(&inode->i_lock);
4466         acl = nfsi->nfs4_acl;
4467         if (acl == NULL)
4468                 goto out;
4469         if (buf == NULL) /* user is just asking for length */
4470                 goto out_len;
4471         if (acl->cached == 0)
4472                 goto out;
4473         ret = -ERANGE; /* see getxattr(2) man page */
4474         if (acl->len > buflen)
4475                 goto out;
4476         memcpy(buf, acl->data, acl->len);
4477 out_len:
4478         ret = acl->len;
4479 out:
4480         spin_unlock(&inode->i_lock);
4481         return ret;
4482 }
4483
4484 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4485 {
4486         struct nfs4_cached_acl *acl;
4487         size_t buflen = sizeof(*acl) + acl_len;
4488
4489         if (buflen <= PAGE_SIZE) {
4490                 acl = kmalloc(buflen, GFP_KERNEL);
4491                 if (acl == NULL)
4492                         goto out;
4493                 acl->cached = 1;
4494                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4495         } else {
4496                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4497                 if (acl == NULL)
4498                         goto out;
4499                 acl->cached = 0;
4500         }
4501         acl->len = acl_len;
4502 out:
4503         nfs4_set_cached_acl(inode, acl);
4504 }
4505
4506 /*
4507  * The getxattr API returns the required buffer length when called with a
4508  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4509  * the required buf.  On a NULL buf, we send a page of data to the server
4510  * guessing that the ACL request can be serviced by a page. If so, we cache
4511  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4512  * the cache. If not so, we throw away the page, and cache the required
4513  * length. The next getxattr call will then produce another round trip to
4514  * the server, this time with the input buf of the required size.
4515  */
4516 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4517 {
4518         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4519         struct nfs_getaclargs args = {
4520                 .fh = NFS_FH(inode),
4521                 .acl_pages = pages,
4522                 .acl_len = buflen,
4523         };
4524         struct nfs_getaclres res = {
4525                 .acl_len = buflen,
4526         };
4527         struct rpc_message msg = {
4528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4529                 .rpc_argp = &args,
4530                 .rpc_resp = &res,
4531         };
4532         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4533         int ret = -ENOMEM, i;
4534
4535         /* As long as we're doing a round trip to the server anyway,
4536          * let's be prepared for a page of acl data. */
4537         if (npages == 0)
4538                 npages = 1;
4539         if (npages > ARRAY_SIZE(pages))
4540                 return -ERANGE;
4541
4542         for (i = 0; i < npages; i++) {
4543                 pages[i] = alloc_page(GFP_KERNEL);
4544                 if (!pages[i])
4545                         goto out_free;
4546         }
4547
4548         /* for decoding across pages */
4549         res.acl_scratch = alloc_page(GFP_KERNEL);
4550         if (!res.acl_scratch)
4551                 goto out_free;
4552
4553         args.acl_len = npages * PAGE_SIZE;
4554         args.acl_pgbase = 0;
4555
4556         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4557                 __func__, buf, buflen, npages, args.acl_len);
4558         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4559                              &msg, &args.seq_args, &res.seq_res, 0);
4560         if (ret)
4561                 goto out_free;
4562
4563         /* Handle the case where the passed-in buffer is too short */
4564         if (res.acl_flags & NFS4_ACL_TRUNC) {
4565                 /* Did the user only issue a request for the acl length? */
4566                 if (buf == NULL)
4567                         goto out_ok;
4568                 ret = -ERANGE;
4569                 goto out_free;
4570         }
4571         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4572         if (buf) {
4573                 if (res.acl_len > buflen) {
4574                         ret = -ERANGE;
4575                         goto out_free;
4576                 }
4577                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4578         }
4579 out_ok:
4580         ret = res.acl_len;
4581 out_free:
4582         for (i = 0; i < npages; i++)
4583                 if (pages[i])
4584                         __free_page(pages[i]);
4585         if (res.acl_scratch)
4586                 __free_page(res.acl_scratch);
4587         return ret;
4588 }
4589
4590 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4591 {
4592         struct nfs4_exception exception = { };
4593         ssize_t ret;
4594         do {
4595                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4596                 trace_nfs4_get_acl(inode, ret);
4597                 if (ret >= 0)
4598                         break;
4599                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4600         } while (exception.retry);
4601         return ret;
4602 }
4603
4604 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4605 {
4606         struct nfs_server *server = NFS_SERVER(inode);
4607         int ret;
4608
4609         if (!nfs4_server_supports_acls(server))
4610                 return -EOPNOTSUPP;
4611         ret = nfs_revalidate_inode(server, inode);
4612         if (ret < 0)
4613                 return ret;
4614         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4615                 nfs_zap_acl_cache(inode);
4616         ret = nfs4_read_cached_acl(inode, buf, buflen);
4617         if (ret != -ENOENT)
4618                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4619                  * but no cached acl data, just the acl length */
4620                 return ret;
4621         return nfs4_get_acl_uncached(inode, buf, buflen);
4622 }
4623
4624 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4625 {
4626         struct nfs_server *server = NFS_SERVER(inode);
4627         struct page *pages[NFS4ACL_MAXPAGES];
4628         struct nfs_setaclargs arg = {
4629                 .fh             = NFS_FH(inode),
4630                 .acl_pages      = pages,
4631                 .acl_len        = buflen,
4632         };
4633         struct nfs_setaclres res;
4634         struct rpc_message msg = {
4635                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4636                 .rpc_argp       = &arg,
4637                 .rpc_resp       = &res,
4638         };
4639         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4640         int ret, i;
4641
4642         if (!nfs4_server_supports_acls(server))
4643                 return -EOPNOTSUPP;
4644         if (npages > ARRAY_SIZE(pages))
4645                 return -ERANGE;
4646         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4647         if (i < 0)
4648                 return i;
4649         nfs4_inode_return_delegation(inode);
4650         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4651
4652         /*
4653          * Free each page after tx, so the only ref left is
4654          * held by the network stack
4655          */
4656         for (; i > 0; i--)
4657                 put_page(pages[i-1]);
4658
4659         /*
4660          * Acl update can result in inode attribute update.
4661          * so mark the attribute cache invalid.
4662          */
4663         spin_lock(&inode->i_lock);
4664         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4665         spin_unlock(&inode->i_lock);
4666         nfs_access_zap_cache(inode);
4667         nfs_zap_acl_cache(inode);
4668         return ret;
4669 }
4670
4671 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4672 {
4673         struct nfs4_exception exception = { };
4674         int err;
4675         do {
4676                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4677                 trace_nfs4_set_acl(inode, err);
4678                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4679                                 &exception);
4680         } while (exception.retry);
4681         return err;
4682 }
4683
4684 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4685 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4686                                         size_t buflen)
4687 {
4688         struct nfs_server *server = NFS_SERVER(inode);
4689         struct nfs_fattr fattr;
4690         struct nfs4_label label = {0, 0, buflen, buf};
4691
4692         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4693         struct nfs4_getattr_arg arg = {
4694                 .fh             = NFS_FH(inode),
4695                 .bitmask        = bitmask,
4696         };
4697         struct nfs4_getattr_res res = {
4698                 .fattr          = &fattr,
4699                 .label          = &label,
4700                 .server         = server,
4701         };
4702         struct rpc_message msg = {
4703                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4704                 .rpc_argp       = &arg,
4705                 .rpc_resp       = &res,
4706         };
4707         int ret;
4708
4709         nfs_fattr_init(&fattr);
4710
4711         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4712         if (ret)
4713                 return ret;
4714         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4715                 return -ENOENT;
4716         if (buflen < label.len)
4717                 return -ERANGE;
4718         return 0;
4719 }
4720
4721 static int nfs4_get_security_label(struct inode *inode, void *buf,
4722                                         size_t buflen)
4723 {
4724         struct nfs4_exception exception = { };
4725         int err;
4726
4727         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4728                 return -EOPNOTSUPP;
4729
4730         do {
4731                 err = _nfs4_get_security_label(inode, buf, buflen);
4732                 trace_nfs4_get_security_label(inode, err);
4733                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4734                                 &exception);
4735         } while (exception.retry);
4736         return err;
4737 }
4738
4739 static int _nfs4_do_set_security_label(struct inode *inode,
4740                 struct nfs4_label *ilabel,
4741                 struct nfs_fattr *fattr,
4742                 struct nfs4_label *olabel)
4743 {
4744
4745         struct iattr sattr = {0};
4746         struct nfs_server *server = NFS_SERVER(inode);
4747         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4748         struct nfs_setattrargs arg = {
4749                 .fh             = NFS_FH(inode),
4750                 .iap            = &sattr,
4751                 .server         = server,
4752                 .bitmask        = bitmask,
4753                 .label          = ilabel,
4754         };
4755         struct nfs_setattrres res = {
4756                 .fattr          = fattr,
4757                 .label          = olabel,
4758                 .server         = server,
4759         };
4760         struct rpc_message msg = {
4761                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4762                 .rpc_argp       = &arg,
4763                 .rpc_resp       = &res,
4764         };
4765         int status;
4766
4767         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4768
4769         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4770         if (status)
4771                 dprintk("%s failed: %d\n", __func__, status);
4772
4773         return status;
4774 }
4775
4776 static int nfs4_do_set_security_label(struct inode *inode,
4777                 struct nfs4_label *ilabel,
4778                 struct nfs_fattr *fattr,
4779                 struct nfs4_label *olabel)
4780 {
4781         struct nfs4_exception exception = { };
4782         int err;
4783
4784         do {
4785                 err = _nfs4_do_set_security_label(inode, ilabel,
4786                                 fattr, olabel);
4787                 trace_nfs4_set_security_label(inode, err);
4788                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4789                                 &exception);
4790         } while (exception.retry);
4791         return err;
4792 }
4793
4794 static int
4795 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4796 {
4797         struct nfs4_label ilabel, *olabel = NULL;
4798         struct nfs_fattr fattr;
4799         struct rpc_cred *cred;
4800         struct inode *inode = dentry->d_inode;
4801         int status;
4802
4803         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4804                 return -EOPNOTSUPP;
4805
4806         nfs_fattr_init(&fattr);
4807
4808         ilabel.pi = 0;
4809         ilabel.lfs = 0;
4810         ilabel.label = (char *)buf;
4811         ilabel.len = buflen;
4812
4813         cred = rpc_lookup_cred();
4814         if (IS_ERR(cred))
4815                 return PTR_ERR(cred);
4816
4817         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4818         if (IS_ERR(olabel)) {
4819                 status = -PTR_ERR(olabel);
4820                 goto out;
4821         }
4822
4823         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4824         if (status == 0)
4825                 nfs_setsecurity(inode, &fattr, olabel);
4826
4827         nfs4_label_free(olabel);
4828 out:
4829         put_rpccred(cred);
4830         return status;
4831 }
4832 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4833
4834
4835 static int
4836 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4837                         struct nfs4_state *state, long *timeout)
4838 {
4839         struct nfs_client *clp = server->nfs_client;
4840
4841         if (task->tk_status >= 0)
4842                 return 0;
4843         switch(task->tk_status) {
4844                 case -NFS4ERR_DELEG_REVOKED:
4845                 case -NFS4ERR_ADMIN_REVOKED:
4846                 case -NFS4ERR_BAD_STATEID:
4847                         if (state == NULL)
4848                                 break;
4849                         nfs_remove_bad_delegation(state->inode);
4850                 case -NFS4ERR_OPENMODE:
4851                         if (state == NULL)
4852                                 break;
4853                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4854                                 goto recovery_failed;
4855                         goto wait_on_recovery;
4856                 case -NFS4ERR_EXPIRED:
4857                         if (state != NULL) {
4858                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4859                                         goto recovery_failed;
4860                         }
4861                 case -NFS4ERR_STALE_STATEID:
4862                 case -NFS4ERR_STALE_CLIENTID:
4863                         nfs4_schedule_lease_recovery(clp);
4864                         goto wait_on_recovery;
4865                 case -NFS4ERR_MOVED:
4866                         if (nfs4_schedule_migration_recovery(server) < 0)
4867                                 goto recovery_failed;
4868                         goto wait_on_recovery;
4869                 case -NFS4ERR_LEASE_MOVED:
4870                         nfs4_schedule_lease_moved_recovery(clp);
4871                         goto wait_on_recovery;
4872 #if defined(CONFIG_NFS_V4_1)
4873                 case -NFS4ERR_BADSESSION:
4874                 case -NFS4ERR_BADSLOT:
4875                 case -NFS4ERR_BAD_HIGH_SLOT:
4876                 case -NFS4ERR_DEADSESSION:
4877                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4878                 case -NFS4ERR_SEQ_FALSE_RETRY:
4879                 case -NFS4ERR_SEQ_MISORDERED:
4880                         dprintk("%s ERROR %d, Reset session\n", __func__,
4881                                 task->tk_status);
4882                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4883                         goto wait_on_recovery;
4884 #endif /* CONFIG_NFS_V4_1 */
4885                 case -NFS4ERR_DELAY:
4886                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4887                         rpc_delay(task, nfs4_update_delay(timeout));
4888                         goto restart_call;
4889                 case -NFS4ERR_GRACE:
4890                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4891                 case -NFS4ERR_RETRY_UNCACHED_REP:
4892                 case -NFS4ERR_OLD_STATEID:
4893                         goto restart_call;
4894         }
4895         task->tk_status = nfs4_map_errors(task->tk_status);
4896         return 0;
4897 recovery_failed:
4898         task->tk_status = -EIO;
4899         return 0;
4900 wait_on_recovery:
4901         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4902         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4903                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4904         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4905                 goto recovery_failed;
4906 restart_call:
4907         task->tk_status = 0;
4908         return -EAGAIN;
4909 }
4910
4911 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4912                                     nfs4_verifier *bootverf)
4913 {
4914         __be32 verf[2];
4915
4916         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4917                 /* An impossible timestamp guarantees this value
4918                  * will never match a generated boot time. */
4919                 verf[0] = 0;
4920                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4921         } else {
4922                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4923                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4924                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4925         }
4926         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4927 }
4928
4929 static unsigned int
4930 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4931                                    char *buf, size_t len)
4932 {
4933         unsigned int result;
4934
4935         rcu_read_lock();
4936         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4937                                 clp->cl_ipaddr,
4938                                 rpc_peeraddr2str(clp->cl_rpcclient,
4939                                                         RPC_DISPLAY_ADDR),
4940                                 rpc_peeraddr2str(clp->cl_rpcclient,
4941                                                         RPC_DISPLAY_PROTO));
4942         rcu_read_unlock();
4943         return result;
4944 }
4945
4946 static unsigned int
4947 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4948                                 char *buf, size_t len)
4949 {
4950         const char *nodename = clp->cl_rpcclient->cl_nodename;
4951
4952         if (nfs4_client_id_uniquifier[0] != '\0')
4953                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4954                                 clp->rpc_ops->version,
4955                                 clp->cl_minorversion,
4956                                 nfs4_client_id_uniquifier,
4957                                 nodename);
4958         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4959                                 clp->rpc_ops->version, clp->cl_minorversion,
4960                                 nodename);
4961 }
4962
4963 /*
4964  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4965  * services.  Advertise one based on the address family of the
4966  * clientaddr.
4967  */
4968 static unsigned int
4969 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4970 {
4971         if (strchr(clp->cl_ipaddr, ':') != NULL)
4972                 return scnprintf(buf, len, "tcp6");
4973         else
4974                 return scnprintf(buf, len, "tcp");
4975 }
4976
4977 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4978 {
4979         struct nfs4_setclientid *sc = calldata;
4980
4981         if (task->tk_status == 0)
4982                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4983 }
4984
4985 static const struct rpc_call_ops nfs4_setclientid_ops = {
4986         .rpc_call_done = nfs4_setclientid_done,
4987 };
4988
4989 /**
4990  * nfs4_proc_setclientid - Negotiate client ID
4991  * @clp: state data structure
4992  * @program: RPC program for NFSv4 callback service
4993  * @port: IP port number for NFS4 callback service
4994  * @cred: RPC credential to use for this call
4995  * @res: where to place the result
4996  *
4997  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4998  */
4999 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5000                 unsigned short port, struct rpc_cred *cred,
5001                 struct nfs4_setclientid_res *res)
5002 {
5003         nfs4_verifier sc_verifier;
5004         struct nfs4_setclientid setclientid = {
5005                 .sc_verifier = &sc_verifier,
5006                 .sc_prog = program,
5007                 .sc_cb_ident = clp->cl_cb_ident,
5008         };
5009         struct rpc_message msg = {
5010                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5011                 .rpc_argp = &setclientid,
5012                 .rpc_resp = res,
5013                 .rpc_cred = cred,
5014         };
5015         struct rpc_task *task;
5016         struct rpc_task_setup task_setup_data = {
5017                 .rpc_client = clp->cl_rpcclient,
5018                 .rpc_message = &msg,
5019                 .callback_ops = &nfs4_setclientid_ops,
5020                 .callback_data = &setclientid,
5021                 .flags = RPC_TASK_TIMEOUT,
5022         };
5023         int status;
5024
5025         /* nfs_client_id4 */
5026         nfs4_init_boot_verifier(clp, &sc_verifier);
5027         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5028                 setclientid.sc_name_len =
5029                                 nfs4_init_uniform_client_string(clp,
5030                                                 setclientid.sc_name,
5031                                                 sizeof(setclientid.sc_name));
5032         else
5033                 setclientid.sc_name_len =
5034                                 nfs4_init_nonuniform_client_string(clp,
5035                                                 setclientid.sc_name,
5036                                                 sizeof(setclientid.sc_name));
5037         /* cb_client4 */
5038         setclientid.sc_netid_len =
5039                                 nfs4_init_callback_netid(clp,
5040                                                 setclientid.sc_netid,
5041                                                 sizeof(setclientid.sc_netid));
5042         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5043                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5044                                 clp->cl_ipaddr, port >> 8, port & 255);
5045
5046         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5047                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5048                 setclientid.sc_name_len, setclientid.sc_name);
5049         task = rpc_run_task(&task_setup_data);
5050         if (IS_ERR(task)) {
5051                 status = PTR_ERR(task);
5052                 goto out;
5053         }
5054         status = task->tk_status;
5055         if (setclientid.sc_cred) {
5056                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5057                 put_rpccred(setclientid.sc_cred);
5058         }
5059         rpc_put_task(task);
5060 out:
5061         trace_nfs4_setclientid(clp, status);
5062         dprintk("NFS reply setclientid: %d\n", status);
5063         return status;
5064 }
5065
5066 /**
5067  * nfs4_proc_setclientid_confirm - Confirm client ID
5068  * @clp: state data structure
5069  * @res: result of a previous SETCLIENTID
5070  * @cred: RPC credential to use for this call
5071  *
5072  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5073  */
5074 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5075                 struct nfs4_setclientid_res *arg,
5076                 struct rpc_cred *cred)
5077 {
5078         struct rpc_message msg = {
5079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5080                 .rpc_argp = arg,
5081                 .rpc_cred = cred,
5082         };
5083         int status;
5084
5085         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5086                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5087                 clp->cl_clientid);
5088         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5089         trace_nfs4_setclientid_confirm(clp, status);
5090         dprintk("NFS reply setclientid_confirm: %d\n", status);
5091         return status;
5092 }
5093
5094 struct nfs4_delegreturndata {
5095         struct nfs4_delegreturnargs args;
5096         struct nfs4_delegreturnres res;
5097         struct nfs_fh fh;
5098         nfs4_stateid stateid;
5099         unsigned long timestamp;
5100         struct nfs_fattr fattr;
5101         int rpc_status;
5102         struct inode *inode;
5103         bool roc;
5104         u32 roc_barrier;
5105 };
5106
5107 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5108 {
5109         struct nfs4_delegreturndata *data = calldata;
5110
5111         if (!nfs4_sequence_done(task, &data->res.seq_res))
5112                 return;
5113
5114         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5115         switch (task->tk_status) {
5116         case 0:
5117                 renew_lease(data->res.server, data->timestamp);
5118         case -NFS4ERR_ADMIN_REVOKED:
5119         case -NFS4ERR_DELEG_REVOKED:
5120         case -NFS4ERR_BAD_STATEID:
5121         case -NFS4ERR_OLD_STATEID:
5122         case -NFS4ERR_STALE_STATEID:
5123         case -NFS4ERR_EXPIRED:
5124                 task->tk_status = 0;
5125                 if (data->roc)
5126                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5127                 break;
5128         default:
5129                 if (nfs4_async_handle_error(task, data->res.server,
5130                                             NULL, NULL) == -EAGAIN) {
5131                         rpc_restart_call_prepare(task);
5132                         return;
5133                 }
5134         }
5135         data->rpc_status = task->tk_status;
5136 }
5137
5138 static void nfs4_delegreturn_release(void *calldata)
5139 {
5140         struct nfs4_delegreturndata *data = calldata;
5141
5142         if (data->roc)
5143                 pnfs_roc_release(data->inode);
5144         kfree(calldata);
5145 }
5146
5147 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5148 {
5149         struct nfs4_delegreturndata *d_data;
5150
5151         d_data = (struct nfs4_delegreturndata *)data;
5152
5153         if (d_data->roc &&
5154             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5155                 return;
5156
5157         nfs4_setup_sequence(d_data->res.server,
5158                         &d_data->args.seq_args,
5159                         &d_data->res.seq_res,
5160                         task);
5161 }
5162
5163 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5164         .rpc_call_prepare = nfs4_delegreturn_prepare,
5165         .rpc_call_done = nfs4_delegreturn_done,
5166         .rpc_release = nfs4_delegreturn_release,
5167 };
5168
5169 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5170 {
5171         struct nfs4_delegreturndata *data;
5172         struct nfs_server *server = NFS_SERVER(inode);
5173         struct rpc_task *task;
5174         struct rpc_message msg = {
5175                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5176                 .rpc_cred = cred,
5177         };
5178         struct rpc_task_setup task_setup_data = {
5179                 .rpc_client = server->client,
5180                 .rpc_message = &msg,
5181                 .callback_ops = &nfs4_delegreturn_ops,
5182                 .flags = RPC_TASK_ASYNC,
5183         };
5184         int status = 0;
5185
5186         data = kzalloc(sizeof(*data), GFP_NOFS);
5187         if (data == NULL)
5188                 return -ENOMEM;
5189         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5190         data->args.fhandle = &data->fh;
5191         data->args.stateid = &data->stateid;
5192         data->args.bitmask = server->cache_consistency_bitmask;
5193         nfs_copy_fh(&data->fh, NFS_FH(inode));
5194         nfs4_stateid_copy(&data->stateid, stateid);
5195         data->res.fattr = &data->fattr;
5196         data->res.server = server;
5197         nfs_fattr_init(data->res.fattr);
5198         data->timestamp = jiffies;
5199         data->rpc_status = 0;
5200         data->inode = inode;
5201         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5202                     pnfs_roc(inode) : false;
5203
5204         task_setup_data.callback_data = data;
5205         msg.rpc_argp = &data->args;
5206         msg.rpc_resp = &data->res;
5207         task = rpc_run_task(&task_setup_data);
5208         if (IS_ERR(task))
5209                 return PTR_ERR(task);
5210         if (!issync)
5211                 goto out;
5212         status = nfs4_wait_for_completion_rpc_task(task);
5213         if (status != 0)
5214                 goto out;
5215         status = data->rpc_status;
5216         if (status == 0)
5217                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5218         else
5219                 nfs_refresh_inode(inode, &data->fattr);
5220 out:
5221         rpc_put_task(task);
5222         return status;
5223 }
5224
5225 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5226 {
5227         struct nfs_server *server = NFS_SERVER(inode);
5228         struct nfs4_exception exception = { };
5229         int err;
5230         do {
5231                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5232                 trace_nfs4_delegreturn(inode, err);
5233                 switch (err) {
5234                         case -NFS4ERR_STALE_STATEID:
5235                         case -NFS4ERR_EXPIRED:
5236                         case 0:
5237                                 return 0;
5238                 }
5239                 err = nfs4_handle_exception(server, err, &exception);
5240         } while (exception.retry);
5241         return err;
5242 }
5243
5244 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5245 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5246
5247 /*
5248  * sleep, with exponential backoff, and retry the LOCK operation.
5249  */
5250 static unsigned long
5251 nfs4_set_lock_task_retry(unsigned long timeout)
5252 {
5253         freezable_schedule_timeout_killable_unsafe(timeout);
5254         timeout <<= 1;
5255         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5256                 return NFS4_LOCK_MAXTIMEOUT;
5257         return timeout;
5258 }
5259
5260 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5261 {
5262         struct inode *inode = state->inode;
5263         struct nfs_server *server = NFS_SERVER(inode);
5264         struct nfs_client *clp = server->nfs_client;
5265         struct nfs_lockt_args arg = {
5266                 .fh = NFS_FH(inode),
5267                 .fl = request,
5268         };
5269         struct nfs_lockt_res res = {
5270                 .denied = request,
5271         };
5272         struct rpc_message msg = {
5273                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5274                 .rpc_argp       = &arg,
5275                 .rpc_resp       = &res,
5276                 .rpc_cred       = state->owner->so_cred,
5277         };
5278         struct nfs4_lock_state *lsp;
5279         int status;
5280
5281         arg.lock_owner.clientid = clp->cl_clientid;
5282         status = nfs4_set_lock_state(state, request);
5283         if (status != 0)
5284                 goto out;
5285         lsp = request->fl_u.nfs4_fl.owner;
5286         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5287         arg.lock_owner.s_dev = server->s_dev;
5288         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5289         switch (status) {
5290                 case 0:
5291                         request->fl_type = F_UNLCK;
5292                         break;
5293                 case -NFS4ERR_DENIED:
5294                         status = 0;
5295         }
5296         request->fl_ops->fl_release_private(request);
5297         request->fl_ops = NULL;
5298 out:
5299         return status;
5300 }
5301
5302 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5303 {
5304         struct nfs4_exception exception = { };
5305         int err;
5306
5307         do {
5308                 err = _nfs4_proc_getlk(state, cmd, request);
5309                 trace_nfs4_get_lock(request, state, cmd, err);
5310                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5311                                 &exception);
5312         } while (exception.retry);
5313         return err;
5314 }
5315
5316 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5317 {
5318         int res = 0;
5319         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5320                 case FL_POSIX:
5321                         res = posix_lock_file_wait(file, fl);
5322                         break;
5323                 case FL_FLOCK:
5324                         res = flock_lock_file_wait(file, fl);
5325                         break;
5326                 default:
5327                         BUG();
5328         }
5329         return res;
5330 }
5331
5332 struct nfs4_unlockdata {
5333         struct nfs_locku_args arg;
5334         struct nfs_locku_res res;
5335         struct nfs4_lock_state *lsp;
5336         struct nfs_open_context *ctx;
5337         struct file_lock fl;
5338         const struct nfs_server *server;
5339         unsigned long timestamp;
5340 };
5341
5342 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5343                 struct nfs_open_context *ctx,
5344                 struct nfs4_lock_state *lsp,
5345                 struct nfs_seqid *seqid)
5346 {
5347         struct nfs4_unlockdata *p;
5348         struct inode *inode = lsp->ls_state->inode;
5349
5350         p = kzalloc(sizeof(*p), GFP_NOFS);
5351         if (p == NULL)
5352                 return NULL;
5353         p->arg.fh = NFS_FH(inode);
5354         p->arg.fl = &p->fl;
5355         p->arg.seqid = seqid;
5356         p->res.seqid = seqid;
5357         p->arg.stateid = &lsp->ls_stateid;
5358         p->lsp = lsp;
5359         atomic_inc(&lsp->ls_count);
5360         /* Ensure we don't close file until we're done freeing locks! */
5361         p->ctx = get_nfs_open_context(ctx);
5362         memcpy(&p->fl, fl, sizeof(p->fl));
5363         p->server = NFS_SERVER(inode);
5364         return p;
5365 }
5366
5367 static void nfs4_locku_release_calldata(void *data)
5368 {
5369         struct nfs4_unlockdata *calldata = data;
5370         nfs_free_seqid(calldata->arg.seqid);
5371         nfs4_put_lock_state(calldata->lsp);
5372         put_nfs_open_context(calldata->ctx);
5373         kfree(calldata);
5374 }
5375
5376 static void nfs4_locku_done(struct rpc_task *task, void *data)
5377 {
5378         struct nfs4_unlockdata *calldata = data;
5379
5380         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5381                 return;
5382         switch (task->tk_status) {
5383                 case 0:
5384                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5385                                         &calldata->res.stateid);
5386                         renew_lease(calldata->server, calldata->timestamp);
5387                         break;
5388                 case -NFS4ERR_BAD_STATEID:
5389                 case -NFS4ERR_OLD_STATEID:
5390                 case -NFS4ERR_STALE_STATEID:
5391                 case -NFS4ERR_EXPIRED:
5392                         break;
5393                 default:
5394                         if (nfs4_async_handle_error(task, calldata->server,
5395                                                     NULL, NULL) == -EAGAIN)
5396                                 rpc_restart_call_prepare(task);
5397         }
5398         nfs_release_seqid(calldata->arg.seqid);
5399 }
5400
5401 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5402 {
5403         struct nfs4_unlockdata *calldata = data;
5404
5405         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5406                 goto out_wait;
5407         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5408                 /* Note: exit _without_ running nfs4_locku_done */
5409                 goto out_no_action;
5410         }
5411         calldata->timestamp = jiffies;
5412         if (nfs4_setup_sequence(calldata->server,
5413                                 &calldata->arg.seq_args,
5414                                 &calldata->res.seq_res,
5415                                 task) != 0)
5416                 nfs_release_seqid(calldata->arg.seqid);
5417         return;
5418 out_no_action:
5419         task->tk_action = NULL;
5420 out_wait:
5421         nfs4_sequence_done(task, &calldata->res.seq_res);
5422 }
5423
5424 static const struct rpc_call_ops nfs4_locku_ops = {
5425         .rpc_call_prepare = nfs4_locku_prepare,
5426         .rpc_call_done = nfs4_locku_done,
5427         .rpc_release = nfs4_locku_release_calldata,
5428 };
5429
5430 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5431                 struct nfs_open_context *ctx,
5432                 struct nfs4_lock_state *lsp,
5433                 struct nfs_seqid *seqid)
5434 {
5435         struct nfs4_unlockdata *data;
5436         struct rpc_message msg = {
5437                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5438                 .rpc_cred = ctx->cred,
5439         };
5440         struct rpc_task_setup task_setup_data = {
5441                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5442                 .rpc_message = &msg,
5443                 .callback_ops = &nfs4_locku_ops,
5444                 .workqueue = nfsiod_workqueue,
5445                 .flags = RPC_TASK_ASYNC,
5446         };
5447
5448         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5449                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5450
5451         /* Ensure this is an unlock - when canceling a lock, the
5452          * canceled lock is passed in, and it won't be an unlock.
5453          */
5454         fl->fl_type = F_UNLCK;
5455
5456         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5457         if (data == NULL) {
5458                 nfs_free_seqid(seqid);
5459                 return ERR_PTR(-ENOMEM);
5460         }
5461
5462         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5463         msg.rpc_argp = &data->arg;
5464         msg.rpc_resp = &data->res;
5465         task_setup_data.callback_data = data;
5466         return rpc_run_task(&task_setup_data);
5467 }
5468
5469 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5470 {
5471         struct inode *inode = state->inode;
5472         struct nfs4_state_owner *sp = state->owner;
5473         struct nfs_inode *nfsi = NFS_I(inode);
5474         struct nfs_seqid *seqid;
5475         struct nfs4_lock_state *lsp;
5476         struct rpc_task *task;
5477         int status = 0;
5478         unsigned char fl_flags = request->fl_flags;
5479
5480         status = nfs4_set_lock_state(state, request);
5481         /* Unlock _before_ we do the RPC call */
5482         request->fl_flags |= FL_EXISTS;
5483         /* Exclude nfs_delegation_claim_locks() */
5484         mutex_lock(&sp->so_delegreturn_mutex);
5485         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5486         down_read(&nfsi->rwsem);
5487         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5488                 up_read(&nfsi->rwsem);
5489                 mutex_unlock(&sp->so_delegreturn_mutex);
5490                 goto out;
5491         }
5492         up_read(&nfsi->rwsem);
5493         mutex_unlock(&sp->so_delegreturn_mutex);
5494         if (status != 0)
5495                 goto out;
5496         /* Is this a delegated lock? */
5497         lsp = request->fl_u.nfs4_fl.owner;
5498         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5499                 goto out;
5500         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5501         status = -ENOMEM;
5502         if (seqid == NULL)
5503                 goto out;
5504         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5505         status = PTR_ERR(task);
5506         if (IS_ERR(task))
5507                 goto out;
5508         status = nfs4_wait_for_completion_rpc_task(task);
5509         rpc_put_task(task);
5510 out:
5511         request->fl_flags = fl_flags;
5512         trace_nfs4_unlock(request, state, F_SETLK, status);
5513         return status;
5514 }
5515
5516 struct nfs4_lockdata {
5517         struct nfs_lock_args arg;
5518         struct nfs_lock_res res;
5519         struct nfs4_lock_state *lsp;
5520         struct nfs_open_context *ctx;
5521         struct file_lock fl;
5522         unsigned long timestamp;
5523         int rpc_status;
5524         int cancelled;
5525         struct nfs_server *server;
5526 };
5527
5528 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5529                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5530                 gfp_t gfp_mask)
5531 {
5532         struct nfs4_lockdata *p;
5533         struct inode *inode = lsp->ls_state->inode;
5534         struct nfs_server *server = NFS_SERVER(inode);
5535
5536         p = kzalloc(sizeof(*p), gfp_mask);
5537         if (p == NULL)
5538                 return NULL;
5539
5540         p->arg.fh = NFS_FH(inode);
5541         p->arg.fl = &p->fl;
5542         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5543         if (p->arg.open_seqid == NULL)
5544                 goto out_free;
5545         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5546         if (p->arg.lock_seqid == NULL)
5547                 goto out_free_seqid;
5548         p->arg.lock_stateid = &lsp->ls_stateid;
5549         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5550         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5551         p->arg.lock_owner.s_dev = server->s_dev;
5552         p->res.lock_seqid = p->arg.lock_seqid;
5553         p->lsp = lsp;
5554         p->server = server;
5555         atomic_inc(&lsp->ls_count);
5556         p->ctx = get_nfs_open_context(ctx);
5557         memcpy(&p->fl, fl, sizeof(p->fl));
5558         return p;
5559 out_free_seqid:
5560         nfs_free_seqid(p->arg.open_seqid);
5561 out_free:
5562         kfree(p);
5563         return NULL;
5564 }
5565
5566 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5567 {
5568         struct nfs4_lockdata *data = calldata;
5569         struct nfs4_state *state = data->lsp->ls_state;
5570
5571         dprintk("%s: begin!\n", __func__);
5572         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5573                 goto out_wait;
5574         /* Do we need to do an open_to_lock_owner? */
5575         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5576                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5577                         goto out_release_lock_seqid;
5578                 }
5579                 data->arg.open_stateid = &state->open_stateid;
5580                 data->arg.new_lock_owner = 1;
5581                 data->res.open_seqid = data->arg.open_seqid;
5582         } else
5583                 data->arg.new_lock_owner = 0;
5584         if (!nfs4_valid_open_stateid(state)) {
5585                 data->rpc_status = -EBADF;
5586                 task->tk_action = NULL;
5587                 goto out_release_open_seqid;
5588         }
5589         data->timestamp = jiffies;
5590         if (nfs4_setup_sequence(data->server,
5591                                 &data->arg.seq_args,
5592                                 &data->res.seq_res,
5593                                 task) == 0)
5594                 return;
5595 out_release_open_seqid:
5596         nfs_release_seqid(data->arg.open_seqid);
5597 out_release_lock_seqid:
5598         nfs_release_seqid(data->arg.lock_seqid);
5599 out_wait:
5600         nfs4_sequence_done(task, &data->res.seq_res);
5601         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5602 }
5603
5604 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5605 {
5606         struct nfs4_lockdata *data = calldata;
5607
5608         dprintk("%s: begin!\n", __func__);
5609
5610         if (!nfs4_sequence_done(task, &data->res.seq_res))
5611                 return;
5612
5613         data->rpc_status = task->tk_status;
5614         if (data->arg.new_lock_owner != 0) {
5615                 if (data->rpc_status == 0)
5616                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5617                 else
5618                         goto out;
5619         }
5620         if (data->rpc_status == 0) {
5621                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5622                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5623                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5624         }
5625 out:
5626         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5627 }
5628
5629 static void nfs4_lock_release(void *calldata)
5630 {
5631         struct nfs4_lockdata *data = calldata;
5632
5633         dprintk("%s: begin!\n", __func__);
5634         nfs_free_seqid(data->arg.open_seqid);
5635         if (data->cancelled != 0) {
5636                 struct rpc_task *task;
5637                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5638                                 data->arg.lock_seqid);
5639                 if (!IS_ERR(task))
5640                         rpc_put_task_async(task);
5641                 dprintk("%s: cancelling lock!\n", __func__);
5642         } else
5643                 nfs_free_seqid(data->arg.lock_seqid);
5644         nfs4_put_lock_state(data->lsp);
5645         put_nfs_open_context(data->ctx);
5646         kfree(data);
5647         dprintk("%s: done!\n", __func__);
5648 }
5649
5650 static const struct rpc_call_ops nfs4_lock_ops = {
5651         .rpc_call_prepare = nfs4_lock_prepare,
5652         .rpc_call_done = nfs4_lock_done,
5653         .rpc_release = nfs4_lock_release,
5654 };
5655
5656 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5657 {
5658         switch (error) {
5659         case -NFS4ERR_ADMIN_REVOKED:
5660         case -NFS4ERR_BAD_STATEID:
5661                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5662                 if (new_lock_owner != 0 ||
5663                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5664                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5665                 break;
5666         case -NFS4ERR_STALE_STATEID:
5667                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5668         case -NFS4ERR_EXPIRED:
5669                 nfs4_schedule_lease_recovery(server->nfs_client);
5670         };
5671 }
5672
5673 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5674 {
5675         struct nfs4_lockdata *data;
5676         struct rpc_task *task;
5677         struct rpc_message msg = {
5678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5679                 .rpc_cred = state->owner->so_cred,
5680         };
5681         struct rpc_task_setup task_setup_data = {
5682                 .rpc_client = NFS_CLIENT(state->inode),
5683                 .rpc_message = &msg,
5684                 .callback_ops = &nfs4_lock_ops,
5685                 .workqueue = nfsiod_workqueue,
5686                 .flags = RPC_TASK_ASYNC,
5687         };
5688         int ret;
5689
5690         dprintk("%s: begin!\n", __func__);
5691         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5692                         fl->fl_u.nfs4_fl.owner,
5693                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5694         if (data == NULL)
5695                 return -ENOMEM;
5696         if (IS_SETLKW(cmd))
5697                 data->arg.block = 1;
5698         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5699         msg.rpc_argp = &data->arg;
5700         msg.rpc_resp = &data->res;
5701         task_setup_data.callback_data = data;
5702         if (recovery_type > NFS_LOCK_NEW) {
5703                 if (recovery_type == NFS_LOCK_RECLAIM)
5704                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5705                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5706         }
5707         task = rpc_run_task(&task_setup_data);
5708         if (IS_ERR(task))
5709                 return PTR_ERR(task);
5710         ret = nfs4_wait_for_completion_rpc_task(task);
5711         if (ret == 0) {
5712                 ret = data->rpc_status;
5713                 if (ret)
5714                         nfs4_handle_setlk_error(data->server, data->lsp,
5715                                         data->arg.new_lock_owner, ret);
5716         } else
5717                 data->cancelled = 1;
5718         rpc_put_task(task);
5719         dprintk("%s: done, ret = %d!\n", __func__, ret);
5720         return ret;
5721 }
5722
5723 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5724 {
5725         struct nfs_server *server = NFS_SERVER(state->inode);
5726         struct nfs4_exception exception = {
5727                 .inode = state->inode,
5728         };
5729         int err;
5730
5731         do {
5732                 /* Cache the lock if possible... */
5733                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5734                         return 0;
5735                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5736                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5737                 if (err != -NFS4ERR_DELAY)
5738                         break;
5739                 nfs4_handle_exception(server, err, &exception);
5740         } while (exception.retry);
5741         return err;
5742 }
5743
5744 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5745 {
5746         struct nfs_server *server = NFS_SERVER(state->inode);
5747         struct nfs4_exception exception = {
5748                 .inode = state->inode,
5749         };
5750         int err;
5751
5752         err = nfs4_set_lock_state(state, request);
5753         if (err != 0)
5754                 return err;
5755         if (!recover_lost_locks) {
5756                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5757                 return 0;
5758         }
5759         do {
5760                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5761                         return 0;
5762                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5763                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5764                 switch (err) {
5765                 default:
5766                         goto out;
5767                 case -NFS4ERR_GRACE:
5768                 case -NFS4ERR_DELAY:
5769                         nfs4_handle_exception(server, err, &exception);
5770                         err = 0;
5771                 }
5772         } while (exception.retry);
5773 out:
5774         return err;
5775 }
5776
5777 #if defined(CONFIG_NFS_V4_1)
5778 /**
5779  * nfs41_check_expired_locks - possibly free a lock stateid
5780  *
5781  * @state: NFSv4 state for an inode
5782  *
5783  * Returns NFS_OK if recovery for this stateid is now finished.
5784  * Otherwise a negative NFS4ERR value is returned.
5785  */
5786 static int nfs41_check_expired_locks(struct nfs4_state *state)
5787 {
5788         int status, ret = -NFS4ERR_BAD_STATEID;
5789         struct nfs4_lock_state *lsp;
5790         struct nfs_server *server = NFS_SERVER(state->inode);
5791
5792         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5793                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5794                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5795
5796                         status = nfs41_test_stateid(server,
5797                                         &lsp->ls_stateid,
5798                                         cred);
5799                         trace_nfs4_test_lock_stateid(state, lsp, status);
5800                         if (status != NFS_OK) {
5801                                 /* Free the stateid unless the server
5802                                  * informs us the stateid is unrecognized. */
5803                                 if (status != -NFS4ERR_BAD_STATEID)
5804                                         nfs41_free_stateid(server,
5805                                                         &lsp->ls_stateid,
5806                                                         cred);
5807                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5808                                 ret = status;
5809                         }
5810                 }
5811         };
5812
5813         return ret;
5814 }
5815
5816 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5817 {
5818         int status = NFS_OK;
5819
5820         if (test_bit(LK_STATE_IN_USE, &state->flags))
5821                 status = nfs41_check_expired_locks(state);
5822         if (status != NFS_OK)
5823                 status = nfs4_lock_expired(state, request);
5824         return status;
5825 }
5826 #endif
5827
5828 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5829 {
5830         struct nfs4_state_owner *sp = state->owner;
5831         struct nfs_inode *nfsi = NFS_I(state->inode);
5832         unsigned char fl_flags = request->fl_flags;
5833         unsigned int seq;
5834         int status = -ENOLCK;
5835
5836         if ((fl_flags & FL_POSIX) &&
5837                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5838                 goto out;
5839         /* Is this a delegated open? */
5840         status = nfs4_set_lock_state(state, request);
5841         if (status != 0)
5842                 goto out;
5843         request->fl_flags |= FL_ACCESS;
5844         status = do_vfs_lock(request->fl_file, request);
5845         if (status < 0)
5846                 goto out;
5847         down_read(&nfsi->rwsem);
5848         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5849                 /* Yes: cache locks! */
5850                 /* ...but avoid races with delegation recall... */
5851                 request->fl_flags = fl_flags & ~FL_SLEEP;
5852                 status = do_vfs_lock(request->fl_file, request);
5853                 goto out_unlock;
5854         }
5855         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5856         up_read(&nfsi->rwsem);
5857         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5858         if (status != 0)
5859                 goto out;
5860         down_read(&nfsi->rwsem);
5861         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5862                 status = -NFS4ERR_DELAY;
5863                 goto out_unlock;
5864         }
5865         /* Note: we always want to sleep here! */
5866         request->fl_flags = fl_flags | FL_SLEEP;
5867         if (do_vfs_lock(request->fl_file, request) < 0)
5868                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5869                         "manager!\n", __func__);
5870 out_unlock:
5871         up_read(&nfsi->rwsem);
5872 out:
5873         request->fl_flags = fl_flags;
5874         return status;
5875 }
5876
5877 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5878 {
5879         struct nfs4_exception exception = {
5880                 .state = state,
5881                 .inode = state->inode,
5882         };
5883         int err;
5884
5885         do {
5886                 err = _nfs4_proc_setlk(state, cmd, request);
5887                 trace_nfs4_set_lock(request, state, cmd, err);
5888                 if (err == -NFS4ERR_DENIED)
5889                         err = -EAGAIN;
5890                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5891                                 err, &exception);
5892         } while (exception.retry);
5893         return err;
5894 }
5895
5896 static int
5897 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5898 {
5899         struct nfs_open_context *ctx;
5900         struct nfs4_state *state;
5901         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5902         int status;
5903
5904         /* verify open state */
5905         ctx = nfs_file_open_context(filp);
5906         state = ctx->state;
5907
5908         if (request->fl_start < 0 || request->fl_end < 0)
5909                 return -EINVAL;
5910
5911         if (IS_GETLK(cmd)) {
5912                 if (state != NULL)
5913                         return nfs4_proc_getlk(state, F_GETLK, request);
5914                 return 0;
5915         }
5916
5917         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5918                 return -EINVAL;
5919
5920         if (request->fl_type == F_UNLCK) {
5921                 if (state != NULL)
5922                         return nfs4_proc_unlck(state, cmd, request);
5923                 return 0;
5924         }
5925
5926         if (state == NULL)
5927                 return -ENOLCK;
5928         /*
5929          * Don't rely on the VFS having checked the file open mode,
5930          * since it won't do this for flock() locks.
5931          */
5932         switch (request->fl_type) {
5933         case F_RDLCK:
5934                 if (!(filp->f_mode & FMODE_READ))
5935                         return -EBADF;
5936                 break;
5937         case F_WRLCK:
5938                 if (!(filp->f_mode & FMODE_WRITE))
5939                         return -EBADF;
5940         }
5941
5942         do {
5943                 status = nfs4_proc_setlk(state, cmd, request);
5944                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5945                         break;
5946                 timeout = nfs4_set_lock_task_retry(timeout);
5947                 status = -ERESTARTSYS;
5948                 if (signalled())
5949                         break;
5950         } while(status < 0);
5951         return status;
5952 }
5953
5954 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5955 {
5956         struct nfs_server *server = NFS_SERVER(state->inode);
5957         int err;
5958
5959         err = nfs4_set_lock_state(state, fl);
5960         if (err != 0)
5961                 return err;
5962         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5963         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5964 }
5965
5966 struct nfs_release_lockowner_data {
5967         struct nfs4_lock_state *lsp;
5968         struct nfs_server *server;
5969         struct nfs_release_lockowner_args args;
5970         struct nfs_release_lockowner_res res;
5971         unsigned long timestamp;
5972 };
5973
5974 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5975 {
5976         struct nfs_release_lockowner_data *data = calldata;
5977         struct nfs_server *server = data->server;
5978         nfs40_setup_sequence(server, &data->args.seq_args,
5979                                 &data->res.seq_res, task);
5980         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5981         data->timestamp = jiffies;
5982 }
5983
5984 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5985 {
5986         struct nfs_release_lockowner_data *data = calldata;
5987         struct nfs_server *server = data->server;
5988
5989         nfs40_sequence_done(task, &data->res.seq_res);
5990
5991         switch (task->tk_status) {
5992         case 0:
5993                 renew_lease(server, data->timestamp);
5994                 break;
5995         case -NFS4ERR_STALE_CLIENTID:
5996         case -NFS4ERR_EXPIRED:
5997                 nfs4_schedule_lease_recovery(server->nfs_client);
5998                 break;
5999         case -NFS4ERR_LEASE_MOVED:
6000         case -NFS4ERR_DELAY:
6001                 if (nfs4_async_handle_error(task, server,
6002                                             NULL, NULL) == -EAGAIN)
6003                         rpc_restart_call_prepare(task);
6004         }
6005 }
6006
6007 static void nfs4_release_lockowner_release(void *calldata)
6008 {
6009         struct nfs_release_lockowner_data *data = calldata;
6010         nfs4_free_lock_state(data->server, data->lsp);
6011         kfree(calldata);
6012 }
6013
6014 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6015         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6016         .rpc_call_done = nfs4_release_lockowner_done,
6017         .rpc_release = nfs4_release_lockowner_release,
6018 };
6019
6020 static void
6021 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6022 {
6023         struct nfs_release_lockowner_data *data;
6024         struct rpc_message msg = {
6025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6026         };
6027
6028         if (server->nfs_client->cl_mvops->minor_version != 0)
6029                 return;
6030
6031         data = kmalloc(sizeof(*data), GFP_NOFS);
6032         if (!data)
6033                 return;
6034         data->lsp = lsp;
6035         data->server = server;
6036         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6037         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6038         data->args.lock_owner.s_dev = server->s_dev;
6039
6040         msg.rpc_argp = &data->args;
6041         msg.rpc_resp = &data->res;
6042         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6043         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6044 }
6045
6046 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6047
6048 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6049                                    const void *buf, size_t buflen,
6050                                    int flags, int type)
6051 {
6052         if (strcmp(key, "") != 0)
6053                 return -EINVAL;
6054
6055         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6056 }
6057
6058 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6059                                    void *buf, size_t buflen, int type)
6060 {
6061         if (strcmp(key, "") != 0)
6062                 return -EINVAL;
6063
6064         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6065 }
6066
6067 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6068                                        size_t list_len, const char *name,
6069                                        size_t name_len, int type)
6070 {
6071         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6072
6073         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6074                 return 0;
6075
6076         if (list && len <= list_len)
6077                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6078         return len;
6079 }
6080
6081 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6082 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6083 {
6084         return server->caps & NFS_CAP_SECURITY_LABEL;
6085 }
6086
6087 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6088                                    const void *buf, size_t buflen,
6089                                    int flags, int type)
6090 {
6091         if (security_ismaclabel(key))
6092                 return nfs4_set_security_label(dentry, buf, buflen);
6093
6094         return -EOPNOTSUPP;
6095 }
6096
6097 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6098                                    void *buf, size_t buflen, int type)
6099 {
6100         if (security_ismaclabel(key))
6101                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6102         return -EOPNOTSUPP;
6103 }
6104
6105 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6106                                        size_t list_len, const char *name,
6107                                        size_t name_len, int type)
6108 {
6109         size_t len = 0;
6110
6111         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6112                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6113                 if (list && len <= list_len)
6114                         security_inode_listsecurity(dentry->d_inode, list, len);
6115         }
6116         return len;
6117 }
6118
6119 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6120         .prefix = XATTR_SECURITY_PREFIX,
6121         .list   = nfs4_xattr_list_nfs4_label,
6122         .get    = nfs4_xattr_get_nfs4_label,
6123         .set    = nfs4_xattr_set_nfs4_label,
6124 };
6125 #endif
6126
6127
6128 /*
6129  * nfs_fhget will use either the mounted_on_fileid or the fileid
6130  */
6131 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6132 {
6133         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6134                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6135               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6136               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6137                 return;
6138
6139         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6140                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6141         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6142         fattr->nlink = 2;
6143 }
6144
6145 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6146                                    const struct qstr *name,
6147                                    struct nfs4_fs_locations *fs_locations,
6148                                    struct page *page)
6149 {
6150         struct nfs_server *server = NFS_SERVER(dir);
6151         u32 bitmask[3] = {
6152                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6153         };
6154         struct nfs4_fs_locations_arg args = {
6155                 .dir_fh = NFS_FH(dir),
6156                 .name = name,
6157                 .page = page,
6158                 .bitmask = bitmask,
6159         };
6160         struct nfs4_fs_locations_res res = {
6161                 .fs_locations = fs_locations,
6162         };
6163         struct rpc_message msg = {
6164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6165                 .rpc_argp = &args,
6166                 .rpc_resp = &res,
6167         };
6168         int status;
6169
6170         dprintk("%s: start\n", __func__);
6171
6172         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6173          * is not supported */
6174         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6175                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6176         else
6177                 bitmask[0] |= FATTR4_WORD0_FILEID;
6178
6179         nfs_fattr_init(&fs_locations->fattr);
6180         fs_locations->server = server;
6181         fs_locations->nlocations = 0;
6182         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6183         dprintk("%s: returned status = %d\n", __func__, status);
6184         return status;
6185 }
6186
6187 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6188                            const struct qstr *name,
6189                            struct nfs4_fs_locations *fs_locations,
6190                            struct page *page)
6191 {
6192         struct nfs4_exception exception = { };
6193         int err;
6194         do {
6195                 err = _nfs4_proc_fs_locations(client, dir, name,
6196                                 fs_locations, page);
6197                 trace_nfs4_get_fs_locations(dir, name, err);
6198                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6199                                 &exception);
6200         } while (exception.retry);
6201         return err;
6202 }
6203
6204 /*
6205  * This operation also signals the server that this client is
6206  * performing migration recovery.  The server can stop returning
6207  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6208  * appended to this compound to identify the client ID which is
6209  * performing recovery.
6210  */
6211 static int _nfs40_proc_get_locations(struct inode *inode,
6212                                      struct nfs4_fs_locations *locations,
6213                                      struct page *page, struct rpc_cred *cred)
6214 {
6215         struct nfs_server *server = NFS_SERVER(inode);
6216         struct rpc_clnt *clnt = server->client;
6217         u32 bitmask[2] = {
6218                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6219         };
6220         struct nfs4_fs_locations_arg args = {
6221                 .clientid       = server->nfs_client->cl_clientid,
6222                 .fh             = NFS_FH(inode),
6223                 .page           = page,
6224                 .bitmask        = bitmask,
6225                 .migration      = 1,            /* skip LOOKUP */
6226                 .renew          = 1,            /* append RENEW */
6227         };
6228         struct nfs4_fs_locations_res res = {
6229                 .fs_locations   = locations,
6230                 .migration      = 1,
6231                 .renew          = 1,
6232         };
6233         struct rpc_message msg = {
6234                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6235                 .rpc_argp       = &args,
6236                 .rpc_resp       = &res,
6237                 .rpc_cred       = cred,
6238         };
6239         unsigned long now = jiffies;
6240         int status;
6241
6242         nfs_fattr_init(&locations->fattr);
6243         locations->server = server;
6244         locations->nlocations = 0;
6245
6246         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6247         nfs4_set_sequence_privileged(&args.seq_args);
6248         status = nfs4_call_sync_sequence(clnt, server, &msg,
6249                                         &args.seq_args, &res.seq_res);
6250         if (status)
6251                 return status;
6252
6253         renew_lease(server, now);
6254         return 0;
6255 }
6256
6257 #ifdef CONFIG_NFS_V4_1
6258
6259 /*
6260  * This operation also signals the server that this client is
6261  * performing migration recovery.  The server can stop asserting
6262  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6263  * performing this operation is identified in the SEQUENCE
6264  * operation in this compound.
6265  *
6266  * When the client supports GETATTR(fs_locations_info), it can
6267  * be plumbed in here.
6268  */
6269 static int _nfs41_proc_get_locations(struct inode *inode,
6270                                      struct nfs4_fs_locations *locations,
6271                                      struct page *page, struct rpc_cred *cred)
6272 {
6273         struct nfs_server *server = NFS_SERVER(inode);
6274         struct rpc_clnt *clnt = server->client;
6275         u32 bitmask[2] = {
6276                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6277         };
6278         struct nfs4_fs_locations_arg args = {
6279                 .fh             = NFS_FH(inode),
6280                 .page           = page,
6281                 .bitmask        = bitmask,
6282                 .migration      = 1,            /* skip LOOKUP */
6283         };
6284         struct nfs4_fs_locations_res res = {
6285                 .fs_locations   = locations,
6286                 .migration      = 1,
6287         };
6288         struct rpc_message msg = {
6289                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6290                 .rpc_argp       = &args,
6291                 .rpc_resp       = &res,
6292                 .rpc_cred       = cred,
6293         };
6294         int status;
6295
6296         nfs_fattr_init(&locations->fattr);
6297         locations->server = server;
6298         locations->nlocations = 0;
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         if (status == NFS4_OK &&
6305             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6306                 status = -NFS4ERR_LEASE_MOVED;
6307         return status;
6308 }
6309
6310 #endif  /* CONFIG_NFS_V4_1 */
6311
6312 /**
6313  * nfs4_proc_get_locations - discover locations for a migrated FSID
6314  * @inode: inode on FSID that is migrating
6315  * @locations: result of query
6316  * @page: buffer
6317  * @cred: credential to use for this operation
6318  *
6319  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6320  * operation failed, or a negative errno if a local error occurred.
6321  *
6322  * On success, "locations" is filled in, but if the server has
6323  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6324  * asserted.
6325  *
6326  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6327  * from this client that require migration recovery.
6328  */
6329 int nfs4_proc_get_locations(struct inode *inode,
6330                             struct nfs4_fs_locations *locations,
6331                             struct page *page, struct rpc_cred *cred)
6332 {
6333         struct nfs_server *server = NFS_SERVER(inode);
6334         struct nfs_client *clp = server->nfs_client;
6335         const struct nfs4_mig_recovery_ops *ops =
6336                                         clp->cl_mvops->mig_recovery_ops;
6337         struct nfs4_exception exception = { };
6338         int status;
6339
6340         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6341                 (unsigned long long)server->fsid.major,
6342                 (unsigned long long)server->fsid.minor,
6343                 clp->cl_hostname);
6344         nfs_display_fhandle(NFS_FH(inode), __func__);
6345
6346         do {
6347                 status = ops->get_locations(inode, locations, page, cred);
6348                 if (status != -NFS4ERR_DELAY)
6349                         break;
6350                 nfs4_handle_exception(server, status, &exception);
6351         } while (exception.retry);
6352         return status;
6353 }
6354
6355 /*
6356  * This operation also signals the server that this client is
6357  * performing "lease moved" recovery.  The server can stop
6358  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6359  * is appended to this compound to identify the client ID which is
6360  * performing recovery.
6361  */
6362 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6363 {
6364         struct nfs_server *server = NFS_SERVER(inode);
6365         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6366         struct rpc_clnt *clnt = server->client;
6367         struct nfs4_fsid_present_arg args = {
6368                 .fh             = NFS_FH(inode),
6369                 .clientid       = clp->cl_clientid,
6370                 .renew          = 1,            /* append RENEW */
6371         };
6372         struct nfs4_fsid_present_res res = {
6373                 .renew          = 1,
6374         };
6375         struct rpc_message msg = {
6376                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6377                 .rpc_argp       = &args,
6378                 .rpc_resp       = &res,
6379                 .rpc_cred       = cred,
6380         };
6381         unsigned long now = jiffies;
6382         int status;
6383
6384         res.fh = nfs_alloc_fhandle();
6385         if (res.fh == NULL)
6386                 return -ENOMEM;
6387
6388         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6389         nfs4_set_sequence_privileged(&args.seq_args);
6390         status = nfs4_call_sync_sequence(clnt, server, &msg,
6391                                                 &args.seq_args, &res.seq_res);
6392         nfs_free_fhandle(res.fh);
6393         if (status)
6394                 return status;
6395
6396         do_renew_lease(clp, now);
6397         return 0;
6398 }
6399
6400 #ifdef CONFIG_NFS_V4_1
6401
6402 /*
6403  * This operation also signals the server that this client is
6404  * performing "lease moved" recovery.  The server can stop asserting
6405  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6406  * this operation is identified in the SEQUENCE operation in this
6407  * compound.
6408  */
6409 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6410 {
6411         struct nfs_server *server = NFS_SERVER(inode);
6412         struct rpc_clnt *clnt = server->client;
6413         struct nfs4_fsid_present_arg args = {
6414                 .fh             = NFS_FH(inode),
6415         };
6416         struct nfs4_fsid_present_res res = {
6417         };
6418         struct rpc_message msg = {
6419                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6420                 .rpc_argp       = &args,
6421                 .rpc_resp       = &res,
6422                 .rpc_cred       = cred,
6423         };
6424         int status;
6425
6426         res.fh = nfs_alloc_fhandle();
6427         if (res.fh == NULL)
6428                 return -ENOMEM;
6429
6430         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6431         nfs4_set_sequence_privileged(&args.seq_args);
6432         status = nfs4_call_sync_sequence(clnt, server, &msg,
6433                                                 &args.seq_args, &res.seq_res);
6434         nfs_free_fhandle(res.fh);
6435         if (status == NFS4_OK &&
6436             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6437                 status = -NFS4ERR_LEASE_MOVED;
6438         return status;
6439 }
6440
6441 #endif  /* CONFIG_NFS_V4_1 */
6442
6443 /**
6444  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6445  * @inode: inode on FSID to check
6446  * @cred: credential to use for this operation
6447  *
6448  * Server indicates whether the FSID is present, moved, or not
6449  * recognized.  This operation is necessary to clear a LEASE_MOVED
6450  * condition for this client ID.
6451  *
6452  * Returns NFS4_OK if the FSID is present on this server,
6453  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6454  *  NFS4ERR code if some error occurred on the server, or a
6455  *  negative errno if a local failure occurred.
6456  */
6457 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6458 {
6459         struct nfs_server *server = NFS_SERVER(inode);
6460         struct nfs_client *clp = server->nfs_client;
6461         const struct nfs4_mig_recovery_ops *ops =
6462                                         clp->cl_mvops->mig_recovery_ops;
6463         struct nfs4_exception exception = { };
6464         int status;
6465
6466         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6467                 (unsigned long long)server->fsid.major,
6468                 (unsigned long long)server->fsid.minor,
6469                 clp->cl_hostname);
6470         nfs_display_fhandle(NFS_FH(inode), __func__);
6471
6472         do {
6473                 status = ops->fsid_present(inode, cred);
6474                 if (status != -NFS4ERR_DELAY)
6475                         break;
6476                 nfs4_handle_exception(server, status, &exception);
6477         } while (exception.retry);
6478         return status;
6479 }
6480
6481 /**
6482  * If 'use_integrity' is true and the state managment nfs_client
6483  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6484  * and the machine credential as per RFC3530bis and RFC5661 Security
6485  * Considerations sections. Otherwise, just use the user cred with the
6486  * filesystem's rpc_client.
6487  */
6488 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6489 {
6490         int status;
6491         struct nfs4_secinfo_arg args = {
6492                 .dir_fh = NFS_FH(dir),
6493                 .name   = name,
6494         };
6495         struct nfs4_secinfo_res res = {
6496                 .flavors     = flavors,
6497         };
6498         struct rpc_message msg = {
6499                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6500                 .rpc_argp = &args,
6501                 .rpc_resp = &res,
6502         };
6503         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6504         struct rpc_cred *cred = NULL;
6505
6506         if (use_integrity) {
6507                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6508                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6509                 msg.rpc_cred = cred;
6510         }
6511
6512         dprintk("NFS call  secinfo %s\n", name->name);
6513
6514         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6515                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6516
6517         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6518                                 &res.seq_res, 0);
6519         dprintk("NFS reply  secinfo: %d\n", status);
6520
6521         if (cred)
6522                 put_rpccred(cred);
6523
6524         return status;
6525 }
6526
6527 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6528                       struct nfs4_secinfo_flavors *flavors)
6529 {
6530         struct nfs4_exception exception = { };
6531         int err;
6532         do {
6533                 err = -NFS4ERR_WRONGSEC;
6534
6535                 /* try to use integrity protection with machine cred */
6536                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6537                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6538
6539                 /*
6540                  * if unable to use integrity protection, or SECINFO with
6541                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6542                  * disallowed by spec, but exists in deployed servers) use
6543                  * the current filesystem's rpc_client and the user cred.
6544                  */
6545                 if (err == -NFS4ERR_WRONGSEC)
6546                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6547
6548                 trace_nfs4_secinfo(dir, name, err);
6549                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6550                                 &exception);
6551         } while (exception.retry);
6552         return err;
6553 }
6554
6555 #ifdef CONFIG_NFS_V4_1
6556 /*
6557  * Check the exchange flags returned by the server for invalid flags, having
6558  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6559  * DS flags set.
6560  */
6561 static int nfs4_check_cl_exchange_flags(u32 flags)
6562 {
6563         if (flags & ~EXCHGID4_FLAG_MASK_R)
6564                 goto out_inval;
6565         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6566             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6567                 goto out_inval;
6568         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6569                 goto out_inval;
6570         return NFS_OK;
6571 out_inval:
6572         return -NFS4ERR_INVAL;
6573 }
6574
6575 static bool
6576 nfs41_same_server_scope(struct nfs41_server_scope *a,
6577                         struct nfs41_server_scope *b)
6578 {
6579         if (a->server_scope_sz == b->server_scope_sz &&
6580             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6581                 return true;
6582
6583         return false;
6584 }
6585
6586 /*
6587  * nfs4_proc_bind_conn_to_session()
6588  *
6589  * The 4.1 client currently uses the same TCP connection for the
6590  * fore and backchannel.
6591  */
6592 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6593 {
6594         int status;
6595         struct nfs41_bind_conn_to_session_res res;
6596         struct rpc_message msg = {
6597                 .rpc_proc =
6598                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6599                 .rpc_argp = clp,
6600                 .rpc_resp = &res,
6601                 .rpc_cred = cred,
6602         };
6603
6604         dprintk("--> %s\n", __func__);
6605
6606         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6607         if (unlikely(res.session == NULL)) {
6608                 status = -ENOMEM;
6609                 goto out;
6610         }
6611
6612         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6613         trace_nfs4_bind_conn_to_session(clp, status);
6614         if (status == 0) {
6615                 if (memcmp(res.session->sess_id.data,
6616                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6617                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6618                         status = -EIO;
6619                         goto out_session;
6620                 }
6621                 if (res.dir != NFS4_CDFS4_BOTH) {
6622                         dprintk("NFS: %s: Unexpected direction from server\n",
6623                                 __func__);
6624                         status = -EIO;
6625                         goto out_session;
6626                 }
6627                 if (res.use_conn_in_rdma_mode) {
6628                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6629                                 __func__);
6630                         status = -EIO;
6631                         goto out_session;
6632                 }
6633         }
6634 out_session:
6635         kfree(res.session);
6636 out:
6637         dprintk("<-- %s status= %d\n", __func__, status);
6638         return status;
6639 }
6640
6641 /*
6642  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6643  * and operations we'd like to see to enable certain features in the allow map
6644  */
6645 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6646         .how = SP4_MACH_CRED,
6647         .enforce.u.words = {
6648                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6649                       1 << (OP_EXCHANGE_ID - 32) |
6650                       1 << (OP_CREATE_SESSION - 32) |
6651                       1 << (OP_DESTROY_SESSION - 32) |
6652                       1 << (OP_DESTROY_CLIENTID - 32)
6653         },
6654         .allow.u.words = {
6655                 [0] = 1 << (OP_CLOSE) |
6656                       1 << (OP_LOCKU) |
6657                       1 << (OP_COMMIT),
6658                 [1] = 1 << (OP_SECINFO - 32) |
6659                       1 << (OP_SECINFO_NO_NAME - 32) |
6660                       1 << (OP_TEST_STATEID - 32) |
6661                       1 << (OP_FREE_STATEID - 32) |
6662                       1 << (OP_WRITE - 32)
6663         }
6664 };
6665
6666 /*
6667  * Select the state protection mode for client `clp' given the server results
6668  * from exchange_id in `sp'.
6669  *
6670  * Returns 0 on success, negative errno otherwise.
6671  */
6672 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6673                                  struct nfs41_state_protection *sp)
6674 {
6675         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6676                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6677                       1 << (OP_EXCHANGE_ID - 32) |
6678                       1 << (OP_CREATE_SESSION - 32) |
6679                       1 << (OP_DESTROY_SESSION - 32) |
6680                       1 << (OP_DESTROY_CLIENTID - 32)
6681         };
6682         unsigned int i;
6683
6684         if (sp->how == SP4_MACH_CRED) {
6685                 /* Print state protect result */
6686                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6687                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6688                         if (test_bit(i, sp->enforce.u.longs))
6689                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6690                         if (test_bit(i, sp->allow.u.longs))
6691                                 dfprintk(MOUNT, "  allow op %d\n", i);
6692                 }
6693
6694                 /* make sure nothing is on enforce list that isn't supported */
6695                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6696                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6697                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6698                                 return -EINVAL;
6699                         }
6700                 }
6701
6702                 /*
6703                  * Minimal mode - state operations are allowed to use machine
6704                  * credential.  Note this already happens by default, so the
6705                  * client doesn't have to do anything more than the negotiation.
6706                  *
6707                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6708                  *       we're already using the machine cred for exchange_id
6709                  *       and will never use a different cred.
6710                  */
6711                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6712                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6713                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6714                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6715                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6716                         dfprintk(MOUNT, "  minimal mode enabled\n");
6717                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6718                 } else {
6719                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6720                         return -EINVAL;
6721                 }
6722
6723                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6724                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6725                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6726                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6727                 }
6728
6729                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6730                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6731                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6732                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6733                 }
6734
6735                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6736                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6737                         dfprintk(MOUNT, "  stateid mode enabled\n");
6738                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6739                 }
6740
6741                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6742                         dfprintk(MOUNT, "  write mode enabled\n");
6743                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6744                 }
6745
6746                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6747                         dfprintk(MOUNT, "  commit mode enabled\n");
6748                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6749                 }
6750         }
6751
6752         return 0;
6753 }
6754
6755 /*
6756  * _nfs4_proc_exchange_id()
6757  *
6758  * Wrapper for EXCHANGE_ID operation.
6759  */
6760 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6761         u32 sp4_how)
6762 {
6763         nfs4_verifier verifier;
6764         struct nfs41_exchange_id_args args = {
6765                 .verifier = &verifier,
6766                 .client = clp,
6767 #ifdef CONFIG_NFS_V4_1_MIGRATION
6768                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6769                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6770                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6771 #else
6772                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6773                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6774 #endif
6775         };
6776         struct nfs41_exchange_id_res res = {
6777                 0
6778         };
6779         int status;
6780         struct rpc_message msg = {
6781                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6782                 .rpc_argp = &args,
6783                 .rpc_resp = &res,
6784                 .rpc_cred = cred,
6785         };
6786
6787         nfs4_init_boot_verifier(clp, &verifier);
6788         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6789                                                         sizeof(args.id));
6790         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6791                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6792                 args.id_len, args.id);
6793
6794         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6795                                         GFP_NOFS);
6796         if (unlikely(res.server_owner == NULL)) {
6797                 status = -ENOMEM;
6798                 goto out;
6799         }
6800
6801         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6802                                         GFP_NOFS);
6803         if (unlikely(res.server_scope == NULL)) {
6804                 status = -ENOMEM;
6805                 goto out_server_owner;
6806         }
6807
6808         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6809         if (unlikely(res.impl_id == NULL)) {
6810                 status = -ENOMEM;
6811                 goto out_server_scope;
6812         }
6813
6814         switch (sp4_how) {
6815         case SP4_NONE:
6816                 args.state_protect.how = SP4_NONE;
6817                 break;
6818
6819         case SP4_MACH_CRED:
6820                 args.state_protect = nfs4_sp4_mach_cred_request;
6821                 break;
6822
6823         default:
6824                 /* unsupported! */
6825                 WARN_ON_ONCE(1);
6826                 status = -EINVAL;
6827                 goto out_server_scope;
6828         }
6829
6830         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6831         trace_nfs4_exchange_id(clp, status);
6832         if (status == 0)
6833                 status = nfs4_check_cl_exchange_flags(res.flags);
6834
6835         if (status == 0)
6836                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6837
6838         if (status == 0) {
6839                 clp->cl_clientid = res.clientid;
6840                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6841                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6842                         clp->cl_seqid = res.seqid;
6843
6844                 kfree(clp->cl_serverowner);
6845                 clp->cl_serverowner = res.server_owner;
6846                 res.server_owner = NULL;
6847
6848                 /* use the most recent implementation id */
6849                 kfree(clp->cl_implid);
6850                 clp->cl_implid = res.impl_id;
6851
6852                 if (clp->cl_serverscope != NULL &&
6853                     !nfs41_same_server_scope(clp->cl_serverscope,
6854                                              res.server_scope)) {
6855                         dprintk("%s: server_scope mismatch detected\n",
6856                                 __func__);
6857                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6858                         kfree(clp->cl_serverscope);
6859                         clp->cl_serverscope = NULL;
6860                 }
6861
6862                 if (clp->cl_serverscope == NULL) {
6863                         clp->cl_serverscope = res.server_scope;
6864                         goto out;
6865                 }
6866         } else
6867                 kfree(res.impl_id);
6868
6869 out_server_owner:
6870         kfree(res.server_owner);
6871 out_server_scope:
6872         kfree(res.server_scope);
6873 out:
6874         if (clp->cl_implid != NULL)
6875                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6876                         "domain: %s, name: %s, date: %llu,%u\n",
6877                         clp->cl_implid->domain, clp->cl_implid->name,
6878                         clp->cl_implid->date.seconds,
6879                         clp->cl_implid->date.nseconds);
6880         dprintk("NFS reply exchange_id: %d\n", status);
6881         return status;
6882 }
6883
6884 /*
6885  * nfs4_proc_exchange_id()
6886  *
6887  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6888  *
6889  * Since the clientid has expired, all compounds using sessions
6890  * associated with the stale clientid will be returning
6891  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6892  * be in some phase of session reset.
6893  *
6894  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6895  */
6896 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6897 {
6898         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6899         int status;
6900
6901         /* try SP4_MACH_CRED if krb5i/p */
6902         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6903             authflavor == RPC_AUTH_GSS_KRB5P) {
6904                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6905                 if (!status)
6906                         return 0;
6907         }
6908
6909         /* try SP4_NONE */
6910         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6911 }
6912
6913 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6914                 struct rpc_cred *cred)
6915 {
6916         struct rpc_message msg = {
6917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6918                 .rpc_argp = clp,
6919                 .rpc_cred = cred,
6920         };
6921         int status;
6922
6923         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6924         trace_nfs4_destroy_clientid(clp, status);
6925         if (status)
6926                 dprintk("NFS: Got error %d from the server %s on "
6927                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6928         return status;
6929 }
6930
6931 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6932                 struct rpc_cred *cred)
6933 {
6934         unsigned int loop;
6935         int ret;
6936
6937         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6938                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6939                 switch (ret) {
6940                 case -NFS4ERR_DELAY:
6941                 case -NFS4ERR_CLIENTID_BUSY:
6942                         ssleep(1);
6943                         break;
6944                 default:
6945                         return ret;
6946                 }
6947         }
6948         return 0;
6949 }
6950
6951 int nfs4_destroy_clientid(struct nfs_client *clp)
6952 {
6953         struct rpc_cred *cred;
6954         int ret = 0;
6955
6956         if (clp->cl_mvops->minor_version < 1)
6957                 goto out;
6958         if (clp->cl_exchange_flags == 0)
6959                 goto out;
6960         if (clp->cl_preserve_clid)
6961                 goto out;
6962         cred = nfs4_get_clid_cred(clp);
6963         ret = nfs4_proc_destroy_clientid(clp, cred);
6964         if (cred)
6965                 put_rpccred(cred);
6966         switch (ret) {
6967         case 0:
6968         case -NFS4ERR_STALE_CLIENTID:
6969                 clp->cl_exchange_flags = 0;
6970         }
6971 out:
6972         return ret;
6973 }
6974
6975 struct nfs4_get_lease_time_data {
6976         struct nfs4_get_lease_time_args *args;
6977         struct nfs4_get_lease_time_res *res;
6978         struct nfs_client *clp;
6979 };
6980
6981 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6982                                         void *calldata)
6983 {
6984         struct nfs4_get_lease_time_data *data =
6985                         (struct nfs4_get_lease_time_data *)calldata;
6986
6987         dprintk("--> %s\n", __func__);
6988         /* just setup sequence, do not trigger session recovery
6989            since we're invoked within one */
6990         nfs41_setup_sequence(data->clp->cl_session,
6991                         &data->args->la_seq_args,
6992                         &data->res->lr_seq_res,
6993                         task);
6994         dprintk("<-- %s\n", __func__);
6995 }
6996
6997 /*
6998  * Called from nfs4_state_manager thread for session setup, so don't recover
6999  * from sequence operation or clientid errors.
7000  */
7001 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7002 {
7003         struct nfs4_get_lease_time_data *data =
7004                         (struct nfs4_get_lease_time_data *)calldata;
7005
7006         dprintk("--> %s\n", __func__);
7007         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7008                 return;
7009         switch (task->tk_status) {
7010         case -NFS4ERR_DELAY:
7011         case -NFS4ERR_GRACE:
7012                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7013                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7014                 task->tk_status = 0;
7015                 /* fall through */
7016         case -NFS4ERR_RETRY_UNCACHED_REP:
7017                 rpc_restart_call_prepare(task);
7018                 return;
7019         }
7020         dprintk("<-- %s\n", __func__);
7021 }
7022
7023 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7024         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7025         .rpc_call_done = nfs4_get_lease_time_done,
7026 };
7027
7028 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7029 {
7030         struct rpc_task *task;
7031         struct nfs4_get_lease_time_args args;
7032         struct nfs4_get_lease_time_res res = {
7033                 .lr_fsinfo = fsinfo,
7034         };
7035         struct nfs4_get_lease_time_data data = {
7036                 .args = &args,
7037                 .res = &res,
7038                 .clp = clp,
7039         };
7040         struct rpc_message msg = {
7041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7042                 .rpc_argp = &args,
7043                 .rpc_resp = &res,
7044         };
7045         struct rpc_task_setup task_setup = {
7046                 .rpc_client = clp->cl_rpcclient,
7047                 .rpc_message = &msg,
7048                 .callback_ops = &nfs4_get_lease_time_ops,
7049                 .callback_data = &data,
7050                 .flags = RPC_TASK_TIMEOUT,
7051         };
7052         int status;
7053
7054         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7055         nfs4_set_sequence_privileged(&args.la_seq_args);
7056         dprintk("--> %s\n", __func__);
7057         task = rpc_run_task(&task_setup);
7058
7059         if (IS_ERR(task))
7060                 status = PTR_ERR(task);
7061         else {
7062                 status = task->tk_status;
7063                 rpc_put_task(task);
7064         }
7065         dprintk("<-- %s return %d\n", __func__, status);
7066
7067         return status;
7068 }
7069
7070 /*
7071  * Initialize the values to be used by the client in CREATE_SESSION
7072  * If nfs4_init_session set the fore channel request and response sizes,
7073  * use them.
7074  *
7075  * Set the back channel max_resp_sz_cached to zero to force the client to
7076  * always set csa_cachethis to FALSE because the current implementation
7077  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7078  */
7079 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7080 {
7081         unsigned int max_rqst_sz, max_resp_sz;
7082
7083         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7084         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7085
7086         /* Fore channel attributes */
7087         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7088         args->fc_attrs.max_resp_sz = max_resp_sz;
7089         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7090         args->fc_attrs.max_reqs = max_session_slots;
7091
7092         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7093                 "max_ops=%u max_reqs=%u\n",
7094                 __func__,
7095                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7096                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7097
7098         /* Back channel attributes */
7099         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7100         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7101         args->bc_attrs.max_resp_sz_cached = 0;
7102         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7103         args->bc_attrs.max_reqs = 1;
7104
7105         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7106                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7107                 __func__,
7108                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7109                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7110                 args->bc_attrs.max_reqs);
7111 }
7112
7113 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7114 {
7115         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7116         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7117
7118         if (rcvd->max_resp_sz > sent->max_resp_sz)
7119                 return -EINVAL;
7120         /*
7121          * Our requested max_ops is the minimum we need; we're not
7122          * prepared to break up compounds into smaller pieces than that.
7123          * So, no point even trying to continue if the server won't
7124          * cooperate:
7125          */
7126         if (rcvd->max_ops < sent->max_ops)
7127                 return -EINVAL;
7128         if (rcvd->max_reqs == 0)
7129                 return -EINVAL;
7130         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7131                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7132         return 0;
7133 }
7134
7135 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7136 {
7137         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7138         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7139
7140         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7141                 return -EINVAL;
7142         if (rcvd->max_resp_sz < sent->max_resp_sz)
7143                 return -EINVAL;
7144         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7145                 return -EINVAL;
7146         /* These would render the backchannel useless: */
7147         if (rcvd->max_ops != sent->max_ops)
7148                 return -EINVAL;
7149         if (rcvd->max_reqs != sent->max_reqs)
7150                 return -EINVAL;
7151         return 0;
7152 }
7153
7154 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7155                                      struct nfs4_session *session)
7156 {
7157         int ret;
7158
7159         ret = nfs4_verify_fore_channel_attrs(args, session);
7160         if (ret)
7161                 return ret;
7162         return nfs4_verify_back_channel_attrs(args, session);
7163 }
7164
7165 static int _nfs4_proc_create_session(struct nfs_client *clp,
7166                 struct rpc_cred *cred)
7167 {
7168         struct nfs4_session *session = clp->cl_session;
7169         struct nfs41_create_session_args args = {
7170                 .client = clp,
7171                 .cb_program = NFS4_CALLBACK,
7172         };
7173         struct nfs41_create_session_res res = {
7174                 .client = clp,
7175         };
7176         struct rpc_message msg = {
7177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7178                 .rpc_argp = &args,
7179                 .rpc_resp = &res,
7180                 .rpc_cred = cred,
7181         };
7182         int status;
7183
7184         nfs4_init_channel_attrs(&args);
7185         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7186
7187         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7188         trace_nfs4_create_session(clp, status);
7189
7190         if (!status) {
7191                 /* Verify the session's negotiated channel_attrs values */
7192                 status = nfs4_verify_channel_attrs(&args, session);
7193                 /* Increment the clientid slot sequence id */
7194                 clp->cl_seqid++;
7195         }
7196
7197         return status;
7198 }
7199
7200 /*
7201  * Issues a CREATE_SESSION operation to the server.
7202  * It is the responsibility of the caller to verify the session is
7203  * expired before calling this routine.
7204  */
7205 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7206 {
7207         int status;
7208         unsigned *ptr;
7209         struct nfs4_session *session = clp->cl_session;
7210
7211         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7212
7213         status = _nfs4_proc_create_session(clp, cred);
7214         if (status)
7215                 goto out;
7216
7217         /* Init or reset the session slot tables */
7218         status = nfs4_setup_session_slot_tables(session);
7219         dprintk("slot table setup returned %d\n", status);
7220         if (status)
7221                 goto out;
7222
7223         ptr = (unsigned *)&session->sess_id.data[0];
7224         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7225                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7226 out:
7227         dprintk("<-- %s\n", __func__);
7228         return status;
7229 }
7230
7231 /*
7232  * Issue the over-the-wire RPC DESTROY_SESSION.
7233  * The caller must serialize access to this routine.
7234  */
7235 int nfs4_proc_destroy_session(struct nfs4_session *session,
7236                 struct rpc_cred *cred)
7237 {
7238         struct rpc_message msg = {
7239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7240                 .rpc_argp = session,
7241                 .rpc_cred = cred,
7242         };
7243         int status = 0;
7244
7245         dprintk("--> nfs4_proc_destroy_session\n");
7246
7247         /* session is still being setup */
7248         if (session->clp->cl_cons_state != NFS_CS_READY)
7249                 return status;
7250
7251         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7252         trace_nfs4_destroy_session(session->clp, status);
7253
7254         if (status)
7255                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7256                         "Session has been destroyed regardless...\n", status);
7257
7258         dprintk("<-- nfs4_proc_destroy_session\n");
7259         return status;
7260 }
7261
7262 /*
7263  * Renew the cl_session lease.
7264  */
7265 struct nfs4_sequence_data {
7266         struct nfs_client *clp;
7267         struct nfs4_sequence_args args;
7268         struct nfs4_sequence_res res;
7269 };
7270
7271 static void nfs41_sequence_release(void *data)
7272 {
7273         struct nfs4_sequence_data *calldata = data;
7274         struct nfs_client *clp = calldata->clp;
7275
7276         if (atomic_read(&clp->cl_count) > 1)
7277                 nfs4_schedule_state_renewal(clp);
7278         nfs_put_client(clp);
7279         kfree(calldata);
7280 }
7281
7282 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7283 {
7284         switch(task->tk_status) {
7285         case -NFS4ERR_DELAY:
7286                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7287                 return -EAGAIN;
7288         default:
7289                 nfs4_schedule_lease_recovery(clp);
7290         }
7291         return 0;
7292 }
7293
7294 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7295 {
7296         struct nfs4_sequence_data *calldata = data;
7297         struct nfs_client *clp = calldata->clp;
7298
7299         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7300                 return;
7301
7302         trace_nfs4_sequence(clp, task->tk_status);
7303         if (task->tk_status < 0) {
7304                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7305                 if (atomic_read(&clp->cl_count) == 1)
7306                         goto out;
7307
7308                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7309                         rpc_restart_call_prepare(task);
7310                         return;
7311                 }
7312         }
7313         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7314 out:
7315         dprintk("<-- %s\n", __func__);
7316 }
7317
7318 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7319 {
7320         struct nfs4_sequence_data *calldata = data;
7321         struct nfs_client *clp = calldata->clp;
7322         struct nfs4_sequence_args *args;
7323         struct nfs4_sequence_res *res;
7324
7325         args = task->tk_msg.rpc_argp;
7326         res = task->tk_msg.rpc_resp;
7327
7328         nfs41_setup_sequence(clp->cl_session, args, res, task);
7329 }
7330
7331 static const struct rpc_call_ops nfs41_sequence_ops = {
7332         .rpc_call_done = nfs41_sequence_call_done,
7333         .rpc_call_prepare = nfs41_sequence_prepare,
7334         .rpc_release = nfs41_sequence_release,
7335 };
7336
7337 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7338                 struct rpc_cred *cred,
7339                 bool is_privileged)
7340 {
7341         struct nfs4_sequence_data *calldata;
7342         struct rpc_message msg = {
7343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7344                 .rpc_cred = cred,
7345         };
7346         struct rpc_task_setup task_setup_data = {
7347                 .rpc_client = clp->cl_rpcclient,
7348                 .rpc_message = &msg,
7349                 .callback_ops = &nfs41_sequence_ops,
7350                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7351         };
7352
7353         if (!atomic_inc_not_zero(&clp->cl_count))
7354                 return ERR_PTR(-EIO);
7355         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7356         if (calldata == NULL) {
7357                 nfs_put_client(clp);
7358                 return ERR_PTR(-ENOMEM);
7359         }
7360         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7361         if (is_privileged)
7362                 nfs4_set_sequence_privileged(&calldata->args);
7363         msg.rpc_argp = &calldata->args;
7364         msg.rpc_resp = &calldata->res;
7365         calldata->clp = clp;
7366         task_setup_data.callback_data = calldata;
7367
7368         return rpc_run_task(&task_setup_data);
7369 }
7370
7371 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7372 {
7373         struct rpc_task *task;
7374         int ret = 0;
7375
7376         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7377                 return -EAGAIN;
7378         task = _nfs41_proc_sequence(clp, cred, false);
7379         if (IS_ERR(task))
7380                 ret = PTR_ERR(task);
7381         else
7382                 rpc_put_task_async(task);
7383         dprintk("<-- %s status=%d\n", __func__, ret);
7384         return ret;
7385 }
7386
7387 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7388 {
7389         struct rpc_task *task;
7390         int ret;
7391
7392         task = _nfs41_proc_sequence(clp, cred, true);
7393         if (IS_ERR(task)) {
7394                 ret = PTR_ERR(task);
7395                 goto out;
7396         }
7397         ret = rpc_wait_for_completion_task(task);
7398         if (!ret) {
7399                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7400
7401                 if (task->tk_status == 0)
7402                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7403                 ret = task->tk_status;
7404         }
7405         rpc_put_task(task);
7406 out:
7407         dprintk("<-- %s status=%d\n", __func__, ret);
7408         return ret;
7409 }
7410
7411 struct nfs4_reclaim_complete_data {
7412         struct nfs_client *clp;
7413         struct nfs41_reclaim_complete_args arg;
7414         struct nfs41_reclaim_complete_res res;
7415 };
7416
7417 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7418 {
7419         struct nfs4_reclaim_complete_data *calldata = data;
7420
7421         nfs41_setup_sequence(calldata->clp->cl_session,
7422                         &calldata->arg.seq_args,
7423                         &calldata->res.seq_res,
7424                         task);
7425 }
7426
7427 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7428 {
7429         switch(task->tk_status) {
7430         case 0:
7431         case -NFS4ERR_COMPLETE_ALREADY:
7432         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7433                 break;
7434         case -NFS4ERR_DELAY:
7435                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7436                 /* fall through */
7437         case -NFS4ERR_RETRY_UNCACHED_REP:
7438                 return -EAGAIN;
7439         default:
7440                 nfs4_schedule_lease_recovery(clp);
7441         }
7442         return 0;
7443 }
7444
7445 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7446 {
7447         struct nfs4_reclaim_complete_data *calldata = data;
7448         struct nfs_client *clp = calldata->clp;
7449         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7450
7451         dprintk("--> %s\n", __func__);
7452         if (!nfs41_sequence_done(task, res))
7453                 return;
7454
7455         trace_nfs4_reclaim_complete(clp, task->tk_status);
7456         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7457                 rpc_restart_call_prepare(task);
7458                 return;
7459         }
7460         dprintk("<-- %s\n", __func__);
7461 }
7462
7463 static void nfs4_free_reclaim_complete_data(void *data)
7464 {
7465         struct nfs4_reclaim_complete_data *calldata = data;
7466
7467         kfree(calldata);
7468 }
7469
7470 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7471         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7472         .rpc_call_done = nfs4_reclaim_complete_done,
7473         .rpc_release = nfs4_free_reclaim_complete_data,
7474 };
7475
7476 /*
7477  * Issue a global reclaim complete.
7478  */
7479 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7480                 struct rpc_cred *cred)
7481 {
7482         struct nfs4_reclaim_complete_data *calldata;
7483         struct rpc_task *task;
7484         struct rpc_message msg = {
7485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7486                 .rpc_cred = cred,
7487         };
7488         struct rpc_task_setup task_setup_data = {
7489                 .rpc_client = clp->cl_rpcclient,
7490                 .rpc_message = &msg,
7491                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7492                 .flags = RPC_TASK_ASYNC,
7493         };
7494         int status = -ENOMEM;
7495
7496         dprintk("--> %s\n", __func__);
7497         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7498         if (calldata == NULL)
7499                 goto out;
7500         calldata->clp = clp;
7501         calldata->arg.one_fs = 0;
7502
7503         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7504         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7505         msg.rpc_argp = &calldata->arg;
7506         msg.rpc_resp = &calldata->res;
7507         task_setup_data.callback_data = calldata;
7508         task = rpc_run_task(&task_setup_data);
7509         if (IS_ERR(task)) {
7510                 status = PTR_ERR(task);
7511                 goto out;
7512         }
7513         status = nfs4_wait_for_completion_rpc_task(task);
7514         if (status == 0)
7515                 status = task->tk_status;
7516         rpc_put_task(task);
7517         return 0;
7518 out:
7519         dprintk("<-- %s status=%d\n", __func__, status);
7520         return status;
7521 }
7522
7523 static void
7524 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7525 {
7526         struct nfs4_layoutget *lgp = calldata;
7527         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7528         struct nfs4_session *session = nfs4_get_session(server);
7529
7530         dprintk("--> %s\n", __func__);
7531         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7532          * right now covering the LAYOUTGET we are about to send.
7533          * However, that is not so catastrophic, and there seems
7534          * to be no way to prevent it completely.
7535          */
7536         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7537                                 &lgp->res.seq_res, task))
7538                 return;
7539         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7540                                           NFS_I(lgp->args.inode)->layout,
7541                                           lgp->args.ctx->state)) {
7542                 rpc_exit(task, NFS4_OK);
7543         }
7544 }
7545
7546 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7547 {
7548         struct nfs4_layoutget *lgp = calldata;
7549         struct inode *inode = lgp->args.inode;
7550         struct nfs_server *server = NFS_SERVER(inode);
7551         struct pnfs_layout_hdr *lo;
7552         struct nfs4_state *state = NULL;
7553         unsigned long timeo, now, giveup;
7554
7555         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7556
7557         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7558                 goto out;
7559
7560         switch (task->tk_status) {
7561         case 0:
7562                 goto out;
7563         /*
7564          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7565          * (or clients) writing to the same RAID stripe
7566          */
7567         case -NFS4ERR_LAYOUTTRYLATER:
7568         /*
7569          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7570          * existing layout before getting a new one).
7571          */
7572         case -NFS4ERR_RECALLCONFLICT:
7573                 timeo = rpc_get_timeout(task->tk_client);
7574                 giveup = lgp->args.timestamp + timeo;
7575                 now = jiffies;
7576                 if (time_after(giveup, now)) {
7577                         unsigned long delay;
7578
7579                         /* Delay for:
7580                          * - Not less then NFS4_POLL_RETRY_MIN.
7581                          * - One last time a jiffie before we give up
7582                          * - exponential backoff (time_now minus start_attempt)
7583                          */
7584                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7585                                     min((giveup - now - 1),
7586                                         now - lgp->args.timestamp));
7587
7588                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7589                                 __func__, delay);
7590                         rpc_delay(task, delay);
7591                         task->tk_status = 0;
7592                         rpc_restart_call_prepare(task);
7593                         goto out; /* Do not call nfs4_async_handle_error() */
7594                 }
7595                 break;
7596         case -NFS4ERR_EXPIRED:
7597         case -NFS4ERR_BAD_STATEID:
7598                 spin_lock(&inode->i_lock);
7599                 lo = NFS_I(inode)->layout;
7600                 if (!lo || list_empty(&lo->plh_segs)) {
7601                         spin_unlock(&inode->i_lock);
7602                         /* If the open stateid was bad, then recover it. */
7603                         state = lgp->args.ctx->state;
7604                 } else {
7605                         LIST_HEAD(head);
7606
7607                         /*
7608                          * Mark the bad layout state as invalid, then retry
7609                          * with the current stateid.
7610                          */
7611                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7612                         spin_unlock(&inode->i_lock);
7613                         pnfs_free_lseg_list(&head);
7614
7615                         task->tk_status = 0;
7616                         rpc_restart_call_prepare(task);
7617                 }
7618         }
7619         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7620                 rpc_restart_call_prepare(task);
7621 out:
7622         dprintk("<-- %s\n", __func__);
7623 }
7624
7625 static size_t max_response_pages(struct nfs_server *server)
7626 {
7627         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7628         return nfs_page_array_len(0, max_resp_sz);
7629 }
7630
7631 static void nfs4_free_pages(struct page **pages, size_t size)
7632 {
7633         int i;
7634
7635         if (!pages)
7636                 return;
7637
7638         for (i = 0; i < size; i++) {
7639                 if (!pages[i])
7640                         break;
7641                 __free_page(pages[i]);
7642         }
7643         kfree(pages);
7644 }
7645
7646 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7647 {
7648         struct page **pages;
7649         int i;
7650
7651         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7652         if (!pages) {
7653                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7654                 return NULL;
7655         }
7656
7657         for (i = 0; i < size; i++) {
7658                 pages[i] = alloc_page(gfp_flags);
7659                 if (!pages[i]) {
7660                         dprintk("%s: failed to allocate page\n", __func__);
7661                         nfs4_free_pages(pages, size);
7662                         return NULL;
7663                 }
7664         }
7665
7666         return pages;
7667 }
7668
7669 static void nfs4_layoutget_release(void *calldata)
7670 {
7671         struct nfs4_layoutget *lgp = calldata;
7672         struct inode *inode = lgp->args.inode;
7673         struct nfs_server *server = NFS_SERVER(inode);
7674         size_t max_pages = max_response_pages(server);
7675
7676         dprintk("--> %s\n", __func__);
7677         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7678         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7679         put_nfs_open_context(lgp->args.ctx);
7680         kfree(calldata);
7681         dprintk("<-- %s\n", __func__);
7682 }
7683
7684 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7685         .rpc_call_prepare = nfs4_layoutget_prepare,
7686         .rpc_call_done = nfs4_layoutget_done,
7687         .rpc_release = nfs4_layoutget_release,
7688 };
7689
7690 struct pnfs_layout_segment *
7691 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7692 {
7693         struct inode *inode = lgp->args.inode;
7694         struct nfs_server *server = NFS_SERVER(inode);
7695         size_t max_pages = max_response_pages(server);
7696         struct rpc_task *task;
7697         struct rpc_message msg = {
7698                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7699                 .rpc_argp = &lgp->args,
7700                 .rpc_resp = &lgp->res,
7701                 .rpc_cred = lgp->cred,
7702         };
7703         struct rpc_task_setup task_setup_data = {
7704                 .rpc_client = server->client,
7705                 .rpc_message = &msg,
7706                 .callback_ops = &nfs4_layoutget_call_ops,
7707                 .callback_data = lgp,
7708                 .flags = RPC_TASK_ASYNC,
7709         };
7710         struct pnfs_layout_segment *lseg = NULL;
7711         int status = 0;
7712
7713         dprintk("--> %s\n", __func__);
7714
7715         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7716         if (!lgp->args.layout.pages) {
7717                 nfs4_layoutget_release(lgp);
7718                 return ERR_PTR(-ENOMEM);
7719         }
7720         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7721         lgp->args.timestamp = jiffies;
7722
7723         lgp->res.layoutp = &lgp->args.layout;
7724         lgp->res.seq_res.sr_slot = NULL;
7725         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7726
7727         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7728         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7729
7730         task = rpc_run_task(&task_setup_data);
7731         if (IS_ERR(task))
7732                 return ERR_CAST(task);
7733         status = nfs4_wait_for_completion_rpc_task(task);
7734         if (status == 0)
7735                 status = task->tk_status;
7736         trace_nfs4_layoutget(lgp->args.ctx,
7737                         &lgp->args.range,
7738                         &lgp->res.range,
7739                         status);
7740         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7741         if (status == 0 && lgp->res.layoutp->len)
7742                 lseg = pnfs_layout_process(lgp);
7743         rpc_put_task(task);
7744         dprintk("<-- %s status=%d\n", __func__, status);
7745         if (status)
7746                 return ERR_PTR(status);
7747         return lseg;
7748 }
7749
7750 static void
7751 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7752 {
7753         struct nfs4_layoutreturn *lrp = calldata;
7754
7755         dprintk("--> %s\n", __func__);
7756         nfs41_setup_sequence(lrp->clp->cl_session,
7757                         &lrp->args.seq_args,
7758                         &lrp->res.seq_res,
7759                         task);
7760 }
7761
7762 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7763 {
7764         struct nfs4_layoutreturn *lrp = calldata;
7765         struct nfs_server *server;
7766
7767         dprintk("--> %s\n", __func__);
7768
7769         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7770                 return;
7771
7772         server = NFS_SERVER(lrp->args.inode);
7773         switch (task->tk_status) {
7774         default:
7775                 task->tk_status = 0;
7776         case 0:
7777                 break;
7778         case -NFS4ERR_DELAY:
7779                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7780                         break;
7781                 rpc_restart_call_prepare(task);
7782                 return;
7783         }
7784         dprintk("<-- %s\n", __func__);
7785 }
7786
7787 static void nfs4_layoutreturn_release(void *calldata)
7788 {
7789         struct nfs4_layoutreturn *lrp = calldata;
7790         struct pnfs_layout_hdr *lo = lrp->args.layout;
7791
7792         dprintk("--> %s\n", __func__);
7793         spin_lock(&lo->plh_inode->i_lock);
7794         if (lrp->res.lrs_present)
7795                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7796         lo->plh_block_lgets--;
7797         spin_unlock(&lo->plh_inode->i_lock);
7798         pnfs_put_layout_hdr(lrp->args.layout);
7799         kfree(calldata);
7800         dprintk("<-- %s\n", __func__);
7801 }
7802
7803 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7804         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7805         .rpc_call_done = nfs4_layoutreturn_done,
7806         .rpc_release = nfs4_layoutreturn_release,
7807 };
7808
7809 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7810 {
7811         struct rpc_task *task;
7812         struct rpc_message msg = {
7813                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7814                 .rpc_argp = &lrp->args,
7815                 .rpc_resp = &lrp->res,
7816                 .rpc_cred = lrp->cred,
7817         };
7818         struct rpc_task_setup task_setup_data = {
7819                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7820                 .rpc_message = &msg,
7821                 .callback_ops = &nfs4_layoutreturn_call_ops,
7822                 .callback_data = lrp,
7823         };
7824         int status;
7825
7826         dprintk("--> %s\n", __func__);
7827         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7828         task = rpc_run_task(&task_setup_data);
7829         if (IS_ERR(task))
7830                 return PTR_ERR(task);
7831         status = task->tk_status;
7832         trace_nfs4_layoutreturn(lrp->args.inode, status);
7833         dprintk("<-- %s status=%d\n", __func__, status);
7834         rpc_put_task(task);
7835         return status;
7836 }
7837
7838 static int
7839 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7840                 struct pnfs_device *pdev,
7841                 struct rpc_cred *cred)
7842 {
7843         struct nfs4_getdeviceinfo_args args = {
7844                 .pdev = pdev,
7845         };
7846         struct nfs4_getdeviceinfo_res res = {
7847                 .pdev = pdev,
7848         };
7849         struct rpc_message msg = {
7850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7851                 .rpc_argp = &args,
7852                 .rpc_resp = &res,
7853                 .rpc_cred = cred,
7854         };
7855         int status;
7856
7857         dprintk("--> %s\n", __func__);
7858         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7859         dprintk("<-- %s status=%d\n", __func__, status);
7860
7861         return status;
7862 }
7863
7864 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7865                 struct pnfs_device *pdev,
7866                 struct rpc_cred *cred)
7867 {
7868         struct nfs4_exception exception = { };
7869         int err;
7870
7871         do {
7872                 err = nfs4_handle_exception(server,
7873                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7874                                         &exception);
7875         } while (exception.retry);
7876         return err;
7877 }
7878 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7879
7880 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7881 {
7882         struct nfs4_layoutcommit_data *data = calldata;
7883         struct nfs_server *server = NFS_SERVER(data->args.inode);
7884         struct nfs4_session *session = nfs4_get_session(server);
7885
7886         nfs41_setup_sequence(session,
7887                         &data->args.seq_args,
7888                         &data->res.seq_res,
7889                         task);
7890 }
7891
7892 static void
7893 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7894 {
7895         struct nfs4_layoutcommit_data *data = calldata;
7896         struct nfs_server *server = NFS_SERVER(data->args.inode);
7897
7898         if (!nfs41_sequence_done(task, &data->res.seq_res))
7899                 return;
7900
7901         switch (task->tk_status) { /* Just ignore these failures */
7902         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7903         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7904         case -NFS4ERR_BADLAYOUT:     /* no layout */
7905         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7906                 task->tk_status = 0;
7907         case 0:
7908                 break;
7909         default:
7910                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7911                         rpc_restart_call_prepare(task);
7912                         return;
7913                 }
7914         }
7915 }
7916
7917 static void nfs4_layoutcommit_release(void *calldata)
7918 {
7919         struct nfs4_layoutcommit_data *data = calldata;
7920
7921         pnfs_cleanup_layoutcommit(data);
7922         nfs_post_op_update_inode_force_wcc(data->args.inode,
7923                                            data->res.fattr);
7924         put_rpccred(data->cred);
7925         kfree(data);
7926 }
7927
7928 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7929         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7930         .rpc_call_done = nfs4_layoutcommit_done,
7931         .rpc_release = nfs4_layoutcommit_release,
7932 };
7933
7934 int
7935 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7936 {
7937         struct rpc_message msg = {
7938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7939                 .rpc_argp = &data->args,
7940                 .rpc_resp = &data->res,
7941                 .rpc_cred = data->cred,
7942         };
7943         struct rpc_task_setup task_setup_data = {
7944                 .task = &data->task,
7945                 .rpc_client = NFS_CLIENT(data->args.inode),
7946                 .rpc_message = &msg,
7947                 .callback_ops = &nfs4_layoutcommit_ops,
7948                 .callback_data = data,
7949                 .flags = RPC_TASK_ASYNC,
7950         };
7951         struct rpc_task *task;
7952         int status = 0;
7953
7954         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7955                 "lbw: %llu inode %lu\n",
7956                 data->task.tk_pid, sync,
7957                 data->args.lastbytewritten,
7958                 data->args.inode->i_ino);
7959
7960         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7961         task = rpc_run_task(&task_setup_data);
7962         if (IS_ERR(task))
7963                 return PTR_ERR(task);
7964         if (sync == false)
7965                 goto out;
7966         status = nfs4_wait_for_completion_rpc_task(task);
7967         if (status != 0)
7968                 goto out;
7969         status = task->tk_status;
7970         trace_nfs4_layoutcommit(data->args.inode, status);
7971 out:
7972         dprintk("%s: status %d\n", __func__, status);
7973         rpc_put_task(task);
7974         return status;
7975 }
7976
7977 /**
7978  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7979  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7980  */
7981 static int
7982 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7983                     struct nfs_fsinfo *info,
7984                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7985 {
7986         struct nfs41_secinfo_no_name_args args = {
7987                 .style = SECINFO_STYLE_CURRENT_FH,
7988         };
7989         struct nfs4_secinfo_res res = {
7990                 .flavors = flavors,
7991         };
7992         struct rpc_message msg = {
7993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7994                 .rpc_argp = &args,
7995                 .rpc_resp = &res,
7996         };
7997         struct rpc_clnt *clnt = server->client;
7998         struct rpc_cred *cred = NULL;
7999         int status;
8000
8001         if (use_integrity) {
8002                 clnt = server->nfs_client->cl_rpcclient;
8003                 cred = nfs4_get_clid_cred(server->nfs_client);
8004                 msg.rpc_cred = cred;
8005         }
8006
8007         dprintk("--> %s\n", __func__);
8008         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8009                                 &res.seq_res, 0);
8010         dprintk("<-- %s status=%d\n", __func__, status);
8011
8012         if (cred)
8013                 put_rpccred(cred);
8014
8015         return status;
8016 }
8017
8018 static int
8019 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8020                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8021 {
8022         struct nfs4_exception exception = { };
8023         int err;
8024         do {
8025                 /* first try using integrity protection */
8026                 err = -NFS4ERR_WRONGSEC;
8027
8028                 /* try to use integrity protection with machine cred */
8029                 if (_nfs4_is_integrity_protected(server->nfs_client))
8030                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8031                                                           flavors, true);
8032
8033                 /*
8034                  * if unable to use integrity protection, or SECINFO with
8035                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8036                  * disallowed by spec, but exists in deployed servers) use
8037                  * the current filesystem's rpc_client and the user cred.
8038                  */
8039                 if (err == -NFS4ERR_WRONGSEC)
8040                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8041                                                           flavors, false);
8042
8043                 switch (err) {
8044                 case 0:
8045                 case -NFS4ERR_WRONGSEC:
8046                 case -ENOTSUPP:
8047                         goto out;
8048                 default:
8049                         err = nfs4_handle_exception(server, err, &exception);
8050                 }
8051         } while (exception.retry);
8052 out:
8053         return err;
8054 }
8055
8056 static int
8057 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8058                     struct nfs_fsinfo *info)
8059 {
8060         int err;
8061         struct page *page;
8062         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8063         struct nfs4_secinfo_flavors *flavors;
8064         struct nfs4_secinfo4 *secinfo;
8065         int i;
8066
8067         page = alloc_page(GFP_KERNEL);
8068         if (!page) {
8069                 err = -ENOMEM;
8070                 goto out;
8071         }
8072
8073         flavors = page_address(page);
8074         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8075
8076         /*
8077          * Fall back on "guess and check" method if
8078          * the server doesn't support SECINFO_NO_NAME
8079          */
8080         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8081                 err = nfs4_find_root_sec(server, fhandle, info);
8082                 goto out_freepage;
8083         }
8084         if (err)
8085                 goto out_freepage;
8086
8087         for (i = 0; i < flavors->num_flavors; i++) {
8088                 secinfo = &flavors->flavors[i];
8089
8090                 switch (secinfo->flavor) {
8091                 case RPC_AUTH_NULL:
8092                 case RPC_AUTH_UNIX:
8093                 case RPC_AUTH_GSS:
8094                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8095                                         &secinfo->flavor_info);
8096                         break;
8097                 default:
8098                         flavor = RPC_AUTH_MAXFLAVOR;
8099                         break;
8100                 }
8101
8102                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8103                         flavor = RPC_AUTH_MAXFLAVOR;
8104
8105                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8106                         err = nfs4_lookup_root_sec(server, fhandle,
8107                                                    info, flavor);
8108                         if (!err)
8109                                 break;
8110                 }
8111         }
8112
8113         if (flavor == RPC_AUTH_MAXFLAVOR)
8114                 err = -EPERM;
8115
8116 out_freepage:
8117         put_page(page);
8118         if (err == -EACCES)
8119                 return -EPERM;
8120 out:
8121         return err;
8122 }
8123
8124 static int _nfs41_test_stateid(struct nfs_server *server,
8125                 nfs4_stateid *stateid,
8126                 struct rpc_cred *cred)
8127 {
8128         int status;
8129         struct nfs41_test_stateid_args args = {
8130                 .stateid = stateid,
8131         };
8132         struct nfs41_test_stateid_res res;
8133         struct rpc_message msg = {
8134                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8135                 .rpc_argp = &args,
8136                 .rpc_resp = &res,
8137                 .rpc_cred = cred,
8138         };
8139         struct rpc_clnt *rpc_client = server->client;
8140
8141         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8142                 &rpc_client, &msg);
8143
8144         dprintk("NFS call  test_stateid %p\n", stateid);
8145         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8146         nfs4_set_sequence_privileged(&args.seq_args);
8147         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8148                         &args.seq_args, &res.seq_res);
8149         if (status != NFS_OK) {
8150                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8151                 return status;
8152         }
8153         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8154         return -res.status;
8155 }
8156
8157 /**
8158  * nfs41_test_stateid - perform a TEST_STATEID operation
8159  *
8160  * @server: server / transport on which to perform the operation
8161  * @stateid: state ID to test
8162  * @cred: credential
8163  *
8164  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8165  * Otherwise a negative NFS4ERR value is returned if the operation
8166  * failed or the state ID is not currently valid.
8167  */
8168 static int nfs41_test_stateid(struct nfs_server *server,
8169                 nfs4_stateid *stateid,
8170                 struct rpc_cred *cred)
8171 {
8172         struct nfs4_exception exception = { };
8173         int err;
8174         do {
8175                 err = _nfs41_test_stateid(server, stateid, cred);
8176                 if (err != -NFS4ERR_DELAY)
8177                         break;
8178                 nfs4_handle_exception(server, err, &exception);
8179         } while (exception.retry);
8180         return err;
8181 }
8182
8183 struct nfs_free_stateid_data {
8184         struct nfs_server *server;
8185         struct nfs41_free_stateid_args args;
8186         struct nfs41_free_stateid_res res;
8187 };
8188
8189 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8190 {
8191         struct nfs_free_stateid_data *data = calldata;
8192         nfs41_setup_sequence(nfs4_get_session(data->server),
8193                         &data->args.seq_args,
8194                         &data->res.seq_res,
8195                         task);
8196 }
8197
8198 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8199 {
8200         struct nfs_free_stateid_data *data = calldata;
8201
8202         nfs41_sequence_done(task, &data->res.seq_res);
8203
8204         switch (task->tk_status) {
8205         case -NFS4ERR_DELAY:
8206                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8207                         rpc_restart_call_prepare(task);
8208         }
8209 }
8210
8211 static void nfs41_free_stateid_release(void *calldata)
8212 {
8213         kfree(calldata);
8214 }
8215
8216 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8217         .rpc_call_prepare = nfs41_free_stateid_prepare,
8218         .rpc_call_done = nfs41_free_stateid_done,
8219         .rpc_release = nfs41_free_stateid_release,
8220 };
8221
8222 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8223                 nfs4_stateid *stateid,
8224                 struct rpc_cred *cred,
8225                 bool privileged)
8226 {
8227         struct rpc_message msg = {
8228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8229                 .rpc_cred = cred,
8230         };
8231         struct rpc_task_setup task_setup = {
8232                 .rpc_client = server->client,
8233                 .rpc_message = &msg,
8234                 .callback_ops = &nfs41_free_stateid_ops,
8235                 .flags = RPC_TASK_ASYNC,
8236         };
8237         struct nfs_free_stateid_data *data;
8238
8239         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8240                 &task_setup.rpc_client, &msg);
8241
8242         dprintk("NFS call  free_stateid %p\n", stateid);
8243         data = kmalloc(sizeof(*data), GFP_NOFS);
8244         if (!data)
8245                 return ERR_PTR(-ENOMEM);
8246         data->server = server;
8247         nfs4_stateid_copy(&data->args.stateid, stateid);
8248
8249         task_setup.callback_data = data;
8250
8251         msg.rpc_argp = &data->args;
8252         msg.rpc_resp = &data->res;
8253         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8254         if (privileged)
8255                 nfs4_set_sequence_privileged(&data->args.seq_args);
8256
8257         return rpc_run_task(&task_setup);
8258 }
8259
8260 /**
8261  * nfs41_free_stateid - perform a FREE_STATEID operation
8262  *
8263  * @server: server / transport on which to perform the operation
8264  * @stateid: state ID to release
8265  * @cred: credential
8266  *
8267  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8268  * negative NFS4ERR value is returned.
8269  */
8270 static int nfs41_free_stateid(struct nfs_server *server,
8271                 nfs4_stateid *stateid,
8272                 struct rpc_cred *cred)
8273 {
8274         struct rpc_task *task;
8275         int ret;
8276
8277         task = _nfs41_free_stateid(server, stateid, cred, true);
8278         if (IS_ERR(task))
8279                 return PTR_ERR(task);
8280         ret = rpc_wait_for_completion_task(task);
8281         if (!ret)
8282                 ret = task->tk_status;
8283         rpc_put_task(task);
8284         return ret;
8285 }
8286
8287 static void
8288 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8289 {
8290         struct rpc_task *task;
8291         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8292
8293         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8294         nfs4_free_lock_state(server, lsp);
8295         if (IS_ERR(task))
8296                 return;
8297         rpc_put_task(task);
8298 }
8299
8300 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8301                 const nfs4_stateid *s2)
8302 {
8303         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8304                 return false;
8305
8306         if (s1->seqid == s2->seqid)
8307                 return true;
8308         if (s1->seqid == 0 || s2->seqid == 0)
8309                 return true;
8310
8311         return false;
8312 }
8313
8314 #endif /* CONFIG_NFS_V4_1 */
8315
8316 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8317                 const nfs4_stateid *s2)
8318 {
8319         return nfs4_stateid_match(s1, s2);
8320 }
8321
8322
8323 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8324         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8325         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8326         .recover_open   = nfs4_open_reclaim,
8327         .recover_lock   = nfs4_lock_reclaim,
8328         .establish_clid = nfs4_init_clientid,
8329         .detect_trunking = nfs40_discover_server_trunking,
8330 };
8331
8332 #if defined(CONFIG_NFS_V4_1)
8333 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8334         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8335         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8336         .recover_open   = nfs4_open_reclaim,
8337         .recover_lock   = nfs4_lock_reclaim,
8338         .establish_clid = nfs41_init_clientid,
8339         .reclaim_complete = nfs41_proc_reclaim_complete,
8340         .detect_trunking = nfs41_discover_server_trunking,
8341 };
8342 #endif /* CONFIG_NFS_V4_1 */
8343
8344 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8345         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8346         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8347         .recover_open   = nfs40_open_expired,
8348         .recover_lock   = nfs4_lock_expired,
8349         .establish_clid = nfs4_init_clientid,
8350 };
8351
8352 #if defined(CONFIG_NFS_V4_1)
8353 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8354         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8355         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8356         .recover_open   = nfs41_open_expired,
8357         .recover_lock   = nfs41_lock_expired,
8358         .establish_clid = nfs41_init_clientid,
8359 };
8360 #endif /* CONFIG_NFS_V4_1 */
8361
8362 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8363         .sched_state_renewal = nfs4_proc_async_renew,
8364         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8365         .renew_lease = nfs4_proc_renew,
8366 };
8367
8368 #if defined(CONFIG_NFS_V4_1)
8369 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8370         .sched_state_renewal = nfs41_proc_async_sequence,
8371         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8372         .renew_lease = nfs4_proc_sequence,
8373 };
8374 #endif
8375
8376 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8377         .get_locations = _nfs40_proc_get_locations,
8378         .fsid_present = _nfs40_proc_fsid_present,
8379 };
8380
8381 #if defined(CONFIG_NFS_V4_1)
8382 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8383         .get_locations = _nfs41_proc_get_locations,
8384         .fsid_present = _nfs41_proc_fsid_present,
8385 };
8386 #endif  /* CONFIG_NFS_V4_1 */
8387
8388 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8389         .minor_version = 0,
8390         .init_caps = NFS_CAP_READDIRPLUS
8391                 | NFS_CAP_ATOMIC_OPEN
8392                 | NFS_CAP_CHANGE_ATTR
8393                 | NFS_CAP_POSIX_LOCK,
8394         .init_client = nfs40_init_client,
8395         .shutdown_client = nfs40_shutdown_client,
8396         .match_stateid = nfs4_match_stateid,
8397         .find_root_sec = nfs4_find_root_sec,
8398         .free_lock_state = nfs4_release_lockowner,
8399         .call_sync_ops = &nfs40_call_sync_ops,
8400         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8401         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8402         .state_renewal_ops = &nfs40_state_renewal_ops,
8403         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8404 };
8405
8406 #if defined(CONFIG_NFS_V4_1)
8407 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8408         .minor_version = 1,
8409         .init_caps = NFS_CAP_READDIRPLUS
8410                 | NFS_CAP_ATOMIC_OPEN
8411                 | NFS_CAP_CHANGE_ATTR
8412                 | NFS_CAP_POSIX_LOCK
8413                 | NFS_CAP_STATEID_NFSV41
8414                 | NFS_CAP_ATOMIC_OPEN_V1,
8415         .init_client = nfs41_init_client,
8416         .shutdown_client = nfs41_shutdown_client,
8417         .match_stateid = nfs41_match_stateid,
8418         .find_root_sec = nfs41_find_root_sec,
8419         .free_lock_state = nfs41_free_lock_state,
8420         .call_sync_ops = &nfs41_call_sync_ops,
8421         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8422         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8423         .state_renewal_ops = &nfs41_state_renewal_ops,
8424         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8425 };
8426 #endif
8427
8428 #if defined(CONFIG_NFS_V4_2)
8429 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8430         .minor_version = 2,
8431         .init_caps = NFS_CAP_READDIRPLUS
8432                 | NFS_CAP_ATOMIC_OPEN
8433                 | NFS_CAP_CHANGE_ATTR
8434                 | NFS_CAP_POSIX_LOCK
8435                 | NFS_CAP_STATEID_NFSV41
8436                 | NFS_CAP_ATOMIC_OPEN_V1
8437                 | NFS_CAP_SEEK,
8438         .init_client = nfs41_init_client,
8439         .shutdown_client = nfs41_shutdown_client,
8440         .match_stateid = nfs41_match_stateid,
8441         .find_root_sec = nfs41_find_root_sec,
8442         .free_lock_state = nfs41_free_lock_state,
8443         .call_sync_ops = &nfs41_call_sync_ops,
8444         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8445         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8446         .state_renewal_ops = &nfs41_state_renewal_ops,
8447 };
8448 #endif
8449
8450 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8451         [0] = &nfs_v4_0_minor_ops,
8452 #if defined(CONFIG_NFS_V4_1)
8453         [1] = &nfs_v4_1_minor_ops,
8454 #endif
8455 #if defined(CONFIG_NFS_V4_2)
8456         [2] = &nfs_v4_2_minor_ops,
8457 #endif
8458 };
8459
8460 static const struct inode_operations nfs4_dir_inode_operations = {
8461         .create         = nfs_create,
8462         .lookup         = nfs_lookup,
8463         .atomic_open    = nfs_atomic_open,
8464         .link           = nfs_link,
8465         .unlink         = nfs_unlink,
8466         .symlink        = nfs_symlink,
8467         .mkdir          = nfs_mkdir,
8468         .rmdir          = nfs_rmdir,
8469         .mknod          = nfs_mknod,
8470         .rename         = nfs_rename,
8471         .permission     = nfs_permission,
8472         .getattr        = nfs_getattr,
8473         .setattr        = nfs_setattr,
8474         .getxattr       = generic_getxattr,
8475         .setxattr       = generic_setxattr,
8476         .listxattr      = generic_listxattr,
8477         .removexattr    = generic_removexattr,
8478 };
8479
8480 static const struct inode_operations nfs4_file_inode_operations = {
8481         .permission     = nfs_permission,
8482         .getattr        = nfs_getattr,
8483         .setattr        = nfs_setattr,
8484         .getxattr       = generic_getxattr,
8485         .setxattr       = generic_setxattr,
8486         .listxattr      = generic_listxattr,
8487         .removexattr    = generic_removexattr,
8488 };
8489
8490 const struct nfs_rpc_ops nfs_v4_clientops = {
8491         .version        = 4,                    /* protocol version */
8492         .dentry_ops     = &nfs4_dentry_operations,
8493         .dir_inode_ops  = &nfs4_dir_inode_operations,
8494         .file_inode_ops = &nfs4_file_inode_operations,
8495         .file_ops       = &nfs4_file_operations,
8496         .getroot        = nfs4_proc_get_root,
8497         .submount       = nfs4_submount,
8498         .try_mount      = nfs4_try_mount,
8499         .getattr        = nfs4_proc_getattr,
8500         .setattr        = nfs4_proc_setattr,
8501         .lookup         = nfs4_proc_lookup,
8502         .access         = nfs4_proc_access,
8503         .readlink       = nfs4_proc_readlink,
8504         .create         = nfs4_proc_create,
8505         .remove         = nfs4_proc_remove,
8506         .unlink_setup   = nfs4_proc_unlink_setup,
8507         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8508         .unlink_done    = nfs4_proc_unlink_done,
8509         .rename_setup   = nfs4_proc_rename_setup,
8510         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8511         .rename_done    = nfs4_proc_rename_done,
8512         .link           = nfs4_proc_link,
8513         .symlink        = nfs4_proc_symlink,
8514         .mkdir          = nfs4_proc_mkdir,
8515         .rmdir          = nfs4_proc_remove,
8516         .readdir        = nfs4_proc_readdir,
8517         .mknod          = nfs4_proc_mknod,
8518         .statfs         = nfs4_proc_statfs,
8519         .fsinfo         = nfs4_proc_fsinfo,
8520         .pathconf       = nfs4_proc_pathconf,
8521         .set_capabilities = nfs4_server_capabilities,
8522         .decode_dirent  = nfs4_decode_dirent,
8523         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8524         .read_setup     = nfs4_proc_read_setup,
8525         .read_done      = nfs4_read_done,
8526         .write_setup    = nfs4_proc_write_setup,
8527         .write_done     = nfs4_write_done,
8528         .commit_setup   = nfs4_proc_commit_setup,
8529         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8530         .commit_done    = nfs4_commit_done,
8531         .lock           = nfs4_proc_lock,
8532         .clear_acl_cache = nfs4_zap_acl_attr,
8533         .close_context  = nfs4_close_context,
8534         .open_context   = nfs4_atomic_open,
8535         .have_delegation = nfs4_have_delegation,
8536         .return_delegation = nfs4_inode_return_delegation,
8537         .alloc_client   = nfs4_alloc_client,
8538         .init_client    = nfs4_init_client,
8539         .free_client    = nfs4_free_client,
8540         .create_server  = nfs4_create_server,
8541         .clone_server   = nfs_clone_server,
8542 };
8543
8544 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8545         .prefix = XATTR_NAME_NFSV4_ACL,
8546         .list   = nfs4_xattr_list_nfs4_acl,
8547         .get    = nfs4_xattr_get_nfs4_acl,
8548         .set    = nfs4_xattr_set_nfs4_acl,
8549 };
8550
8551 const struct xattr_handler *nfs4_xattr_handlers[] = {
8552         &nfs4_xattr_nfs4_acl_handler,
8553 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8554         &nfs4_xattr_nfs4_label_handler,
8555 #endif
8556         NULL
8557 };
8558
8559 /*
8560  * Local variables:
8561  *  c-basic-offset: 8
8562  * End:
8563  */