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 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96                 return -EREMOTEIO;
  97         case -NFS4ERR_WRONGSEC:
  98                 return -EPERM;
  99         case -NFS4ERR_BADOWNER:
 100         case -NFS4ERR_BADNAME:
 101                 return -EINVAL;
 102         case -NFS4ERR_SHARE_DENIED:
 103                 return -EACCES;
 104         case -NFS4ERR_MINOR_VERS_MISMATCH:
 105                 return -EPROTONOSUPPORT;
 106         case -NFS4ERR_ACCESS:
 107                 return -EACCES;
 108         default:
 109                 dprintk("%s could not handle NFSv4 error %d\n",
 110                                 __func__, -err);
 111                 break;
 112         }
 113         return -EIO;
 114 }
 115
 116 /*
 117  * This is our standard bitmap for GETATTR requests.
 118  */
 119 const u32 nfs4_fattr_bitmap[3] = {
 120         FATTR4_WORD0_TYPE
 121         | FATTR4_WORD0_CHANGE
 122         | FATTR4_WORD0_SIZE
 123         | FATTR4_WORD0_FSID
 124         | FATTR4_WORD0_FILEID,
 125         FATTR4_WORD1_MODE
 126         | FATTR4_WORD1_NUMLINKS
 127         | FATTR4_WORD1_OWNER
 128         | FATTR4_WORD1_OWNER_GROUP
 129         | FATTR4_WORD1_RAWDEV
 130         | FATTR4_WORD1_SPACE_USED
 131         | FATTR4_WORD1_TIME_ACCESS
 132         | FATTR4_WORD1_TIME_METADATA
 133         | FATTR4_WORD1_TIME_MODIFY
 134 };
 135
 136 static const u32 nfs4_pnfs_open_bitmap[3] = {
 137         FATTR4_WORD0_TYPE
 138         | FATTR4_WORD0_CHANGE
 139         | FATTR4_WORD0_SIZE
 140         | FATTR4_WORD0_FSID
 141         | FATTR4_WORD0_FILEID,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY,
 151         FATTR4_WORD2_MDSTHRESHOLD
 152 };
 153
 154 static const u32 nfs4_open_noattr_bitmap[3] = {
 155         FATTR4_WORD0_TYPE
 156         | FATTR4_WORD0_CHANGE
 157         | FATTR4_WORD0_FILEID,
 158 };
 159
 160 const u32 nfs4_statfs_bitmap[2] = {
 161         FATTR4_WORD0_FILES_AVAIL
 162         | FATTR4_WORD0_FILES_FREE
 163         | FATTR4_WORD0_FILES_TOTAL,
 164         FATTR4_WORD1_SPACE_AVAIL
 165         | FATTR4_WORD1_SPACE_FREE
 166         | FATTR4_WORD1_SPACE_TOTAL
 167 };
 168
 169 const u32 nfs4_pathconf_bitmap[2] = {
 170         FATTR4_WORD0_MAXLINK
 171         | FATTR4_WORD0_MAXNAME,
 172         0
 173 };
 174
 175 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 176                         | FATTR4_WORD0_MAXREAD
 177                         | FATTR4_WORD0_MAXWRITE
 178                         | FATTR4_WORD0_LEASE_TIME,
 179                         FATTR4_WORD1_TIME_DELTA
 180                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 181                         FATTR4_WORD2_LAYOUT_BLKSIZE
 182 };
 183
 184 const u32 nfs4_fs_locations_bitmap[2] = {
 185         FATTR4_WORD0_TYPE
 186         | FATTR4_WORD0_CHANGE
 187         | FATTR4_WORD0_SIZE
 188         | FATTR4_WORD0_FSID
 189         | FATTR4_WORD0_FILEID
 190         | FATTR4_WORD0_FS_LOCATIONS,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID
 201 };
 202
 203 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 204                 struct nfs4_readdir_arg *readdir)
 205 {
 206         __be32 *start, *p;
 207
 208         if (cookie > 2) {
 209                 readdir->cookie = cookie;
 210                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 211                 return;
 212         }
 213
 214         readdir->cookie = 0;
 215         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 216         if (cookie == 2)
 217                 return;
 218
 219         /*
 220          * NFSv4 servers do not return entries for '.' and '..'
 221          * Therefore, we fake these entries here.  We let '.'
 222          * have cookie 0 and '..' have cookie 1.  Note that
 223          * when talking to the server, we always send cookie 0
 224          * instead of 1 or 2.
 225          */
 226         start = p = kmap_atomic(*readdir->pages);
 227
 228         if (cookie == 0) {
 229                 *p++ = xdr_one;                                  /* next */
 230                 *p++ = xdr_zero;                   /* cookie, first word */
 231                 *p++ = xdr_one;                   /* cookie, second word */
 232                 *p++ = xdr_one;                             /* entry len */
 233                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 234                 p++;
 235                 *p++ = xdr_one;                         /* bitmap length */
 236                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 237                 *p++ = htonl(8);              /* attribute buffer length */
 238                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 239         }
 240
 241         *p++ = xdr_one;                                  /* next */
 242         *p++ = xdr_zero;                   /* cookie, first word */
 243         *p++ = xdr_two;                   /* cookie, second word */
 244         *p++ = xdr_two;                             /* entry len */
 245         memcpy(p, "..\0\0", 4);                         /* entry */
 246         p++;
 247         *p++ = xdr_one;                         /* bitmap length */
 248         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 249         *p++ = htonl(8);              /* attribute buffer length */
 250         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 251
 252         readdir->pgbase = (char *)p - (char *)start;
 253         readdir->count -= readdir->pgbase;
 254         kunmap_atomic(start);
 255 }
 256
 257 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 258 {
 259         int res = 0;
 260
 261         might_sleep();
 262
 263         if (*timeout <= 0)
 264                 *timeout = NFS4_POLL_RETRY_MIN;
 265         if (*timeout > NFS4_POLL_RETRY_MAX)
 266                 *timeout = NFS4_POLL_RETRY_MAX;
 267         freezable_schedule_timeout_killable(*timeout);
 268         if (fatal_signal_pending(current))
 269                 res = -ERESTARTSYS;
 270         *timeout <<= 1;
 271         return res;
 272 }
 273
 274 /* This is the error handling routine for processes that are allowed
 275  * to sleep.
 276  */
 277 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 278 {
 279         struct nfs_client *clp = server->nfs_client;
 280         struct nfs4_state *state = exception->state;
 281         struct inode *inode = exception->inode;
 282         int ret = errorcode;
 283
 284         exception->retry = 0;
 285         switch(errorcode) {
 286                 case 0:
 287                         return 0;
 288                 case -NFS4ERR_OPENMODE:
 289                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 290                                 nfs4_inode_return_delegation(inode);
 291                                 exception->retry = 1;
 292                                 return 0;
 293                         }
 294                         if (state == NULL)
 295                                 break;
 296                         nfs4_schedule_stateid_recovery(server, state);
 297                         goto wait_on_recovery;
 298                 case -NFS4ERR_DELEG_REVOKED:
 299                 case -NFS4ERR_ADMIN_REVOKED:
 300                 case -NFS4ERR_BAD_STATEID:
 301                         if (state == NULL)
 302                                 break;
 303                         nfs_remove_bad_delegation(state->inode);
 304                         nfs4_schedule_stateid_recovery(server, state);
 305                         goto wait_on_recovery;
 306                 case -NFS4ERR_EXPIRED:
 307                         if (state != NULL)
 308                                 nfs4_schedule_stateid_recovery(server, state);
 309                 case -NFS4ERR_STALE_STATEID:
 310                 case -NFS4ERR_STALE_CLIENTID:
 311                         nfs4_schedule_lease_recovery(clp);
 312                         goto wait_on_recovery;
 313 #if defined(CONFIG_NFS_V4_1)
 314                 case -NFS4ERR_BADSESSION:
 315                 case -NFS4ERR_BADSLOT:
 316                 case -NFS4ERR_BAD_HIGH_SLOT:
 317                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 318                 case -NFS4ERR_DEADSESSION:
 319                 case -NFS4ERR_SEQ_FALSE_RETRY:
 320                 case -NFS4ERR_SEQ_MISORDERED:
 321                         dprintk("%s ERROR: %d Reset session\n", __func__,
 322                                 errorcode);
 323                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 324                         goto wait_on_recovery;
 325 #endif /* defined(CONFIG_NFS_V4_1) */
 326                 case -NFS4ERR_FILE_OPEN:
 327                         if (exception->timeout > HZ) {
 328                                 /* We have retried a decent amount, time to
 329                                  * fail
 330                                  */
 331                                 ret = -EBUSY;
 332                                 break;
 333                         }
 334                 case -NFS4ERR_GRACE:
 335                 case -NFS4ERR_DELAY:
 336                         ret = nfs4_delay(server->client, &exception->timeout);
 337                         if (ret != 0)
 338                                 break;
 339                 case -NFS4ERR_RETRY_UNCACHED_REP:
 340                 case -NFS4ERR_OLD_STATEID:
 341                         exception->retry = 1;
 342                         break;
 343                 case -NFS4ERR_BADOWNER:
 344                         /* The following works around a Linux server bug! */
 345                 case -NFS4ERR_BADNAME:
 346                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 347                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 348                                 exception->retry = 1;
 349                                 printk(KERN_WARNING "NFS: v4 server %s "
 350                                                 "does not accept raw "
 351                                                 "uid/gids. "
 352                                                 "Reenabling the idmapper.\n",
 353                                                 server->nfs_client->cl_hostname);
 354                         }
 355         }
 356         /* We failed to handle the error */
 357         return nfs4_map_errors(ret);
 358 wait_on_recovery:
 359         ret = nfs4_wait_clnt_recover(clp);
 360         if (ret == 0)
 361                 exception->retry = 1;
 362         return ret;
 363 }
 364
 365
 366 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 367 {
 368         spin_lock(&clp->cl_lock);
 369         if (time_before(clp->cl_last_renewal,timestamp))
 370                 clp->cl_last_renewal = timestamp;
 371         spin_unlock(&clp->cl_lock);
 372 }
 373
 374 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 375 {
 376         do_renew_lease(server->nfs_client, timestamp);
 377 }
 378
 379 #if defined(CONFIG_NFS_V4_1)
 380
 381 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 382 {
 383         struct nfs4_session *session;
 384         struct nfs4_slot_table *tbl;
 385         bool send_new_highest_used_slotid = false;
 386
 387         if (!res->sr_slot) {
 388                 /* just wake up the next guy waiting since
 389                  * we may have not consumed a slot after all */
 390                 dprintk("%s: No slot\n", __func__);
 391                 return;
 392         }
 393         tbl = res->sr_slot->table;
 394         session = tbl->session;
 395
 396         spin_lock(&tbl->slot_tbl_lock);
 397         /* Be nice to the server: try to ensure that the last transmitted
 398          * value for highest_user_slotid <= target_highest_slotid
 399          */
 400         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 401                 send_new_highest_used_slotid = true;
 402
 403         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 404                 send_new_highest_used_slotid = false;
 405                 goto out_unlock;
 406         }
 407         nfs4_free_slot(tbl, res->sr_slot);
 408
 409         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 410                 send_new_highest_used_slotid = false;
 411 out_unlock:
 412         spin_unlock(&tbl->slot_tbl_lock);
 413         res->sr_slot = NULL;
 414         if (send_new_highest_used_slotid)
 415                 nfs41_server_notify_highest_slotid_update(session->clp);
 416 }
 417
 418 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 419 {
 420         struct nfs4_session *session;
 421         struct nfs4_slot *slot;
 422         struct nfs_client *clp;
 423         bool interrupted = false;
 424         int ret = 1;
 425
 426         /* don't increment the sequence number if the task wasn't sent */
 427         if (!RPC_WAS_SENT(task))
 428                 goto out;
 429
 430         slot = res->sr_slot;
 431         session = slot->table->session;
 432
 433         if (slot->interrupted) {
 434                 slot->interrupted = 0;
 435                 interrupted = true;
 436         }
 437
 438         /* Check the SEQUENCE operation status */
 439         switch (res->sr_status) {
 440         case 0:
 441                 /* Update the slot's sequence and clientid lease timer */
 442                 ++slot->seq_nr;
 443                 clp = session->clp;
 444                 do_renew_lease(clp, res->sr_timestamp);
 445                 /* Check sequence flags */
 446                 if (res->sr_status_flags != 0)
 447                         nfs4_schedule_lease_recovery(clp);
 448                 nfs41_update_target_slotid(slot->table, slot, res);
 449                 break;
 450         case 1:
 451                 /*
 452                  * sr_status remains 1 if an RPC level error occurred.
 453                  * The server may or may not have processed the sequence
 454                  * operation..
 455                  * Mark the slot as having hosted an interrupted RPC call.
 456                  */
 457                 slot->interrupted = 1;
 458                 goto out;
 459         case -NFS4ERR_DELAY:
 460                 /* The server detected a resend of the RPC call and
 461                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 462                  * of RFC5661.
 463                  */
 464                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 465                         __func__,
 466                         slot->slot_nr,
 467                         slot->seq_nr);
 468                 goto out_retry;
 469         case -NFS4ERR_BADSLOT:
 470                 /*
 471                  * The slot id we used was probably retired. Try again
 472                  * using a different slot id.
 473                  */
 474                 goto retry_nowait;
 475         case -NFS4ERR_SEQ_MISORDERED:
 476                 /*
 477                  * Was the last operation on this sequence interrupted?
 478                  * If so, retry after bumping the sequence number.
 479                  */
 480                 if (interrupted) {
 481                         ++slot->seq_nr;
 482                         goto retry_nowait;
 483                 }
 484                 /*
 485                  * Could this slot have been previously retired?
 486                  * If so, then the server may be expecting seq_nr = 1!
 487                  */
 488                 if (slot->seq_nr != 1) {
 489                         slot->seq_nr = 1;
 490                         goto retry_nowait;
 491                 }
 492                 break;
 493         case -NFS4ERR_SEQ_FALSE_RETRY:
 494                 ++slot->seq_nr;
 495                 goto retry_nowait;
 496         default:
 497                 /* Just update the slot sequence no. */
 498                 ++slot->seq_nr;
 499         }
 500 out:
 501         /* The session may be reset by one of the error handlers. */
 502         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 503         nfs41_sequence_free_slot(res);
 504         return ret;
 505 retry_nowait:
 506         if (rpc_restart_call_prepare(task)) {
 507                 task->tk_status = 0;
 508                 ret = 0;
 509         }
 510         goto out;
 511 out_retry:
 512         if (!rpc_restart_call(task))
 513                 goto out;
 514         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 515         return 0;
 516 }
 517
 518 static int nfs4_sequence_done(struct rpc_task *task,
 519                                struct nfs4_sequence_res *res)
 520 {
 521         if (res->sr_slot == NULL)
 522                 return 1;
 523         return nfs41_sequence_done(task, res);
 524 }
 525
 526 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 527                 struct nfs4_sequence_res *res, int cache_reply)
 528 {
 529         args->sa_slot = NULL;
 530         args->sa_cache_this = 0;
 531         args->sa_privileged = 0;
 532         if (cache_reply)
 533                 args->sa_cache_this = 1;
 534         res->sr_slot = NULL;
 535 }
 536
 537 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 538 {
 539         args->sa_privileged = 1;
 540 }
 541
 542 int nfs41_setup_sequence(struct nfs4_session *session,
 543                                 struct nfs4_sequence_args *args,
 544                                 struct nfs4_sequence_res *res,
 545                                 struct rpc_task *task)
 546 {
 547         struct nfs4_slot *slot;
 548         struct nfs4_slot_table *tbl;
 549
 550         dprintk("--> %s\n", __func__);
 551         /* slot already allocated? */
 552         if (res->sr_slot != NULL)
 553                 goto out_success;
 554
 555         tbl = &session->fc_slot_table;
 556
 557         task->tk_timeout = 0;
 558
 559         spin_lock(&tbl->slot_tbl_lock);
 560         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 561             !args->sa_privileged) {
 562                 /* The state manager will wait until the slot table is empty */
 563                 dprintk("%s session is draining\n", __func__);
 564                 goto out_sleep;
 565         }
 566
 567         slot = nfs4_alloc_slot(tbl);
 568         if (IS_ERR(slot)) {
 569                 /* If out of memory, try again in 1/4 second */
 570                 if (slot == ERR_PTR(-ENOMEM))
 571                         task->tk_timeout = HZ >> 2;
 572                 dprintk("<-- %s: no free slots\n", __func__);
 573                 goto out_sleep;
 574         }
 575         spin_unlock(&tbl->slot_tbl_lock);
 576
 577         args->sa_slot = slot;
 578
 579         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 580                         slot->slot_nr, slot->seq_nr);
 581
 582         res->sr_slot = slot;
 583         res->sr_timestamp = jiffies;
 584         res->sr_status_flags = 0;
 585         /*
 586          * sr_status is only set in decode_sequence, and so will remain
 587          * set to 1 if an rpc level failure occurs.
 588          */
 589         res->sr_status = 1;
 590 out_success:
 591         rpc_call_start(task);
 592         return 0;
 593 out_sleep:
 594         /* Privileged tasks are queued with top priority */
 595         if (args->sa_privileged)
 596                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 597                                 NULL, RPC_PRIORITY_PRIVILEGED);
 598         else
 599                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 600         spin_unlock(&tbl->slot_tbl_lock);
 601         return -EAGAIN;
 602 }
 603 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 604
 605 int nfs4_setup_sequence(const struct nfs_server *server,
 606                         struct nfs4_sequence_args *args,
 607                         struct nfs4_sequence_res *res,
 608                         struct rpc_task *task)
 609 {
 610         struct nfs4_session *session = nfs4_get_session(server);
 611         int ret = 0;
 612
 613         if (session == NULL) {
 614                 rpc_call_start(task);
 615                 goto out;
 616         }
 617
 618         dprintk("--> %s clp %p session %p sr_slot %d\n",
 619                 __func__, session->clp, session, res->sr_slot ?
 620                         res->sr_slot->slot_nr : -1);
 621
 622         ret = nfs41_setup_sequence(session, args, res, task);
 623 out:
 624         dprintk("<-- %s status=%d\n", __func__, ret);
 625         return ret;
 626 }
 627
 628 struct nfs41_call_sync_data {
 629         const struct nfs_server *seq_server;
 630         struct nfs4_sequence_args *seq_args;
 631         struct nfs4_sequence_res *seq_res;
 632 };
 633
 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 635 {
 636         struct nfs41_call_sync_data *data = calldata;
 637         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 638
 639         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 640
 641         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 642 }
 643
 644 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 645 {
 646         struct nfs41_call_sync_data *data = calldata;
 647
 648         nfs41_sequence_done(task, data->seq_res);
 649 }
 650
 651 static const struct rpc_call_ops nfs41_call_sync_ops = {
 652         .rpc_call_prepare = nfs41_call_sync_prepare,
 653         .rpc_call_done = nfs41_call_sync_done,
 654 };
 655
 656 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 657                                    struct nfs_server *server,
 658                                    struct rpc_message *msg,
 659                                    struct nfs4_sequence_args *args,
 660                                    struct nfs4_sequence_res *res)
 661 {
 662         int ret;
 663         struct rpc_task *task;
 664         struct nfs41_call_sync_data data = {
 665                 .seq_server = server,
 666                 .seq_args = args,
 667                 .seq_res = res,
 668         };
 669         struct rpc_task_setup task_setup = {
 670                 .rpc_client = clnt,
 671                 .rpc_message = msg,
 672                 .callback_ops = &nfs41_call_sync_ops,
 673                 .callback_data = &data
 674         };
 675
 676         task = rpc_run_task(&task_setup);
 677         if (IS_ERR(task))
 678                 ret = PTR_ERR(task);
 679         else {
 680                 ret = task->tk_status;
 681                 rpc_put_task(task);
 682         }
 683         return ret;
 684 }
 685
 686 #else
 687 static
 688 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 689                 struct nfs4_sequence_res *res, int cache_reply)
 690 {
 691 }
 692
 693 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 694 {
 695 }
 696
 697
 698 static int nfs4_sequence_done(struct rpc_task *task,
 699                                struct nfs4_sequence_res *res)
 700 {
 701         return 1;
 702 }
 703 #endif /* CONFIG_NFS_V4_1 */
 704
 705 static
 706 int _nfs4_call_sync(struct rpc_clnt *clnt,
 707                     struct nfs_server *server,
 708                     struct rpc_message *msg,
 709                     struct nfs4_sequence_args *args,
 710                     struct nfs4_sequence_res *res)
 711 {
 712         return rpc_call_sync(clnt, msg, 0);
 713 }
 714
 715 static
 716 int nfs4_call_sync(struct rpc_clnt *clnt,
 717                    struct nfs_server *server,
 718                    struct rpc_message *msg,
 719                    struct nfs4_sequence_args *args,
 720                    struct nfs4_sequence_res *res,
 721                    int cache_reply)
 722 {
 723         nfs41_init_sequence(args, res, cache_reply);
 724         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 725                                                 args, res);
 726 }
 727
 728 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 729 {
 730         struct nfs_inode *nfsi = NFS_I(dir);
 731
 732         spin_lock(&dir->i_lock);
 733         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 734         if (!cinfo->atomic || cinfo->before != dir->i_version)
 735                 nfs_force_lookup_revalidate(dir);
 736         dir->i_version = cinfo->after;
 737         nfs_fscache_invalidate(dir);
 738         spin_unlock(&dir->i_lock);
 739 }
 740
 741 struct nfs4_opendata {
 742         struct kref kref;
 743         struct nfs_openargs o_arg;
 744         struct nfs_openres o_res;
 745         struct nfs_open_confirmargs c_arg;
 746         struct nfs_open_confirmres c_res;
 747         struct nfs4_string owner_name;
 748         struct nfs4_string group_name;
 749         struct nfs_fattr f_attr;
 750         struct dentry *dir;
 751         struct dentry *dentry;
 752         struct nfs4_state_owner *owner;
 753         struct nfs4_state *state;
 754         struct iattr attrs;
 755         unsigned long timestamp;
 756         unsigned int rpc_done : 1;
 757         int rpc_status;
 758         int cancelled;
 759 };
 760
 761
 762 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 763 {
 764         p->o_res.f_attr = &p->f_attr;
 765         p->o_res.seqid = p->o_arg.seqid;
 766         p->c_res.seqid = p->c_arg.seqid;
 767         p->o_res.server = p->o_arg.server;
 768         p->o_res.access_request = p->o_arg.access;
 769         nfs_fattr_init(&p->f_attr);
 770         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 771 }
 772
 773 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 774                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 775                 const struct iattr *attrs,
 776                 gfp_t gfp_mask)
 777 {
 778         struct dentry *parent = dget_parent(dentry);
 779         struct inode *dir = parent->d_inode;
 780         struct nfs_server *server = NFS_SERVER(dir);
 781         struct nfs4_opendata *p;
 782
 783         p = kzalloc(sizeof(*p), gfp_mask);
 784         if (p == NULL)
 785                 goto err;
 786         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 787         if (p->o_arg.seqid == NULL)
 788                 goto err_free;
 789         nfs_sb_active(dentry->d_sb);
 790         p->dentry = dget(dentry);
 791         p->dir = parent;
 792         p->owner = sp;
 793         atomic_inc(&sp->so_count);
 794         p->o_arg.fh = NFS_FH(dir);
 795         p->o_arg.open_flags = flags;
 796         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 797         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 798          * will return permission denied for all bits until close */
 799         if (!(flags & O_EXCL)) {
 800                 /* ask server to check for all possible rights as results
 801                  * are cached */
 802                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 803                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 804         }
 805         p->o_arg.clientid = server->nfs_client->cl_clientid;
 806         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 807         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 808         p->o_arg.name = &dentry->d_name;
 809         p->o_arg.server = server;
 810         p->o_arg.bitmask = server->attr_bitmask;
 811         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 812         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 813         if (attrs != NULL && attrs->ia_valid != 0) {
 814                 __be32 verf[2];
 815
 816                 p->o_arg.u.attrs = &p->attrs;
 817                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 818
 819                 verf[0] = jiffies;
 820                 verf[1] = current->pid;
 821                 memcpy(p->o_arg.u.verifier.data, verf,
 822                                 sizeof(p->o_arg.u.verifier.data));
 823         }
 824         p->c_arg.fh = &p->o_res.fh;
 825         p->c_arg.stateid = &p->o_res.stateid;
 826         p->c_arg.seqid = p->o_arg.seqid;
 827         nfs4_init_opendata_res(p);
 828         kref_init(&p->kref);
 829         return p;
 830 err_free:
 831         kfree(p);
 832 err:
 833         dput(parent);
 834         return NULL;
 835 }
 836
 837 static void nfs4_opendata_free(struct kref *kref)
 838 {
 839         struct nfs4_opendata *p = container_of(kref,
 840                         struct nfs4_opendata, kref);
 841         struct super_block *sb = p->dentry->d_sb;
 842
 843         nfs_free_seqid(p->o_arg.seqid);
 844         if (p->state != NULL)
 845                 nfs4_put_open_state(p->state);
 846         nfs4_put_state_owner(p->owner);
 847         dput(p->dir);
 848         dput(p->dentry);
 849         nfs_sb_deactive(sb);
 850         nfs_fattr_free_names(&p->f_attr);
 851         kfree(p);
 852 }
 853
 854 static void nfs4_opendata_put(struct nfs4_opendata *p)
 855 {
 856         if (p != NULL)
 857                 kref_put(&p->kref, nfs4_opendata_free);
 858 }
 859
 860 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 861 {
 862         int ret;
 863
 864         ret = rpc_wait_for_completion_task(task);
 865         return ret;
 866 }
 867
 868 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 869 {
 870         int ret = 0;
 871
 872         if (open_mode & (O_EXCL|O_TRUNC))
 873                 goto out;
 874         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 875                 case FMODE_READ:
 876                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 877                                 && state->n_rdonly != 0;
 878                         break;
 879                 case FMODE_WRITE:
 880                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 881                                 && state->n_wronly != 0;
 882                         break;
 883                 case FMODE_READ|FMODE_WRITE:
 884                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 885                                 && state->n_rdwr != 0;
 886         }
 887 out:
 888         return ret;
 889 }
 890
 891 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 892 {
 893         if (delegation == NULL)
 894                 return 0;
 895         if ((delegation->type & fmode) != fmode)
 896                 return 0;
 897         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 898                 return 0;
 899         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 900                 return 0;
 901         nfs_mark_delegation_referenced(delegation);
 902         return 1;
 903 }
 904
 905 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 906 {
 907         switch (fmode) {
 908                 case FMODE_WRITE:
 909                         state->n_wronly++;
 910                         break;
 911                 case FMODE_READ:
 912                         state->n_rdonly++;
 913                         break;
 914                 case FMODE_READ|FMODE_WRITE:
 915                         state->n_rdwr++;
 916         }
 917         nfs4_state_set_mode_locked(state, state->state | fmode);
 918 }
 919
 920 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 921 {
 922         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 923                 nfs4_stateid_copy(&state->stateid, stateid);
 924         nfs4_stateid_copy(&state->open_stateid, stateid);
 925         switch (fmode) {
 926                 case FMODE_READ:
 927                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_WRITE:
 930                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 931                         break;
 932                 case FMODE_READ|FMODE_WRITE:
 933                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 934         }
 935 }
 936
 937 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 938 {
 939         write_seqlock(&state->seqlock);
 940         nfs_set_open_stateid_locked(state, stateid, fmode);
 941         write_sequnlock(&state->seqlock);
 942 }
 943
 944 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 945 {
 946         /*
 947          * Protect the call to nfs4_state_set_mode_locked and
 948          * serialise the stateid update
 949          */
 950         write_seqlock(&state->seqlock);
 951         if (deleg_stateid != NULL) {
 952                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 953                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 954         }
 955         if (open_stateid != NULL)
 956                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 957         write_sequnlock(&state->seqlock);
 958         spin_lock(&state->owner->so_lock);
 959         update_open_stateflags(state, fmode);
 960         spin_unlock(&state->owner->so_lock);
 961 }
 962
 963 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 964 {
 965         struct nfs_inode *nfsi = NFS_I(state->inode);
 966         struct nfs_delegation *deleg_cur;
 967         int ret = 0;
 968
 969         fmode &= (FMODE_READ|FMODE_WRITE);
 970
 971         rcu_read_lock();
 972         deleg_cur = rcu_dereference(nfsi->delegation);
 973         if (deleg_cur == NULL)
 974                 goto no_delegation;
 975
 976         spin_lock(&deleg_cur->lock);
 977         if (nfsi->delegation != deleg_cur ||
 978            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
 979             (deleg_cur->type & fmode) != fmode)
 980                 goto no_delegation_unlock;
 981
 982         if (delegation == NULL)
 983                 delegation = &deleg_cur->stateid;
 984         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 985                 goto no_delegation_unlock;
 986
 987         nfs_mark_delegation_referenced(deleg_cur);
 988         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 989         ret = 1;
 990 no_delegation_unlock:
 991         spin_unlock(&deleg_cur->lock);
 992 no_delegation:
 993         rcu_read_unlock();
 994
 995         if (!ret && open_stateid != NULL) {
 996                 __update_open_stateid(state, open_stateid, NULL, fmode);
 997                 ret = 1;
 998         }
 999
1000         return ret;
1001 }
1002
1003
1004 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1005 {
1006         struct nfs_delegation *delegation;
1007
1008         rcu_read_lock();
1009         delegation = rcu_dereference(NFS_I(inode)->delegation);
1010         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1011                 rcu_read_unlock();
1012                 return;
1013         }
1014         rcu_read_unlock();
1015         nfs4_inode_return_delegation(inode);
1016 }
1017
1018 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1019 {
1020         struct nfs4_state *state = opendata->state;
1021         struct nfs_inode *nfsi = NFS_I(state->inode);
1022         struct nfs_delegation *delegation;
1023         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1024         fmode_t fmode = opendata->o_arg.fmode;
1025         nfs4_stateid stateid;
1026         int ret = -EAGAIN;
1027
1028         for (;;) {
1029                 if (can_open_cached(state, fmode, open_mode)) {
1030                         spin_lock(&state->owner->so_lock);
1031                         if (can_open_cached(state, fmode, open_mode)) {
1032                                 update_open_stateflags(state, fmode);
1033                                 spin_unlock(&state->owner->so_lock);
1034                                 goto out_return_state;
1035                         }
1036                         spin_unlock(&state->owner->so_lock);
1037                 }
1038                 rcu_read_lock();
1039                 delegation = rcu_dereference(nfsi->delegation);
1040                 if (!can_open_delegated(delegation, fmode)) {
1041                         rcu_read_unlock();
1042                         break;
1043                 }
1044                 /* Save the delegation */
1045                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1046                 rcu_read_unlock();
1047                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1048                 if (ret != 0)
1049                         goto out;
1050                 ret = -EAGAIN;
1051
1052                 /* Try to update the stateid using the delegation */
1053                 if (update_open_stateid(state, NULL, &stateid, fmode))
1054                         goto out_return_state;
1055         }
1056 out:
1057         return ERR_PTR(ret);
1058 out_return_state:
1059         atomic_inc(&state->count);
1060         return state;
1061 }
1062
1063 static void
1064 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1065 {
1066         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1067         struct nfs_delegation *delegation;
1068         int delegation_flags = 0;
1069
1070         rcu_read_lock();
1071         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1072         if (delegation)
1073                 delegation_flags = delegation->flags;
1074         rcu_read_unlock();
1075         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1076                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1077                                    "returning a delegation for "
1078                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1079                                    clp->cl_hostname);
1080         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1081                 nfs_inode_set_delegation(state->inode,
1082                                          data->owner->so_cred,
1083                                          &data->o_res);
1084         else
1085                 nfs_inode_reclaim_delegation(state->inode,
1086                                              data->owner->so_cred,
1087                                              &data->o_res);
1088 }
1089
1090 /*
1091  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1092  * and update the nfs4_state.
1093  */
1094 static struct nfs4_state *
1095 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1096 {
1097         struct inode *inode = data->state->inode;
1098         struct nfs4_state *state = data->state;
1099         int ret;
1100
1101         if (!data->rpc_done) {
1102                 ret = data->rpc_status;
1103                 goto err;
1104         }
1105
1106         ret = -ESTALE;
1107         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1108             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1109             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1110                 goto err;
1111
1112         ret = -ENOMEM;
1113         state = nfs4_get_open_state(inode, data->owner);
1114         if (state == NULL)
1115                 goto err;
1116
1117         ret = nfs_refresh_inode(inode, &data->f_attr);
1118         if (ret)
1119                 goto err;
1120
1121         if (data->o_res.delegation_type != 0)
1122                 nfs4_opendata_check_deleg(data, state);
1123         update_open_stateid(state, &data->o_res.stateid, NULL,
1124                             data->o_arg.fmode);
1125
1126         return state;
1127 err:
1128         return ERR_PTR(ret);
1129
1130 }
1131
1132 static struct nfs4_state *
1133 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1134 {
1135         struct inode *inode;
1136         struct nfs4_state *state = NULL;
1137         int ret;
1138
1139         if (!data->rpc_done) {
1140                 state = nfs4_try_open_cached(data);
1141                 goto out;
1142         }
1143
1144         ret = -EAGAIN;
1145         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1146                 goto err;
1147         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1148         ret = PTR_ERR(inode);
1149         if (IS_ERR(inode))
1150                 goto err;
1151         ret = -ENOMEM;
1152         state = nfs4_get_open_state(inode, data->owner);
1153         if (state == NULL)
1154                 goto err_put_inode;
1155         if (data->o_res.delegation_type != 0)
1156                 nfs4_opendata_check_deleg(data, state);
1157         update_open_stateid(state, &data->o_res.stateid, NULL,
1158                         data->o_arg.fmode);
1159         iput(inode);
1160 out:
1161         return state;
1162 err_put_inode:
1163         iput(inode);
1164 err:
1165         return ERR_PTR(ret);
1166 }
1167
1168 static struct nfs4_state *
1169 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1170 {
1171         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1172                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1173         return _nfs4_opendata_to_nfs4_state(data);
1174 }
1175
1176 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1177 {
1178         struct nfs_inode *nfsi = NFS_I(state->inode);
1179         struct nfs_open_context *ctx;
1180
1181         spin_lock(&state->inode->i_lock);
1182         list_for_each_entry(ctx, &nfsi->open_files, list) {
1183                 if (ctx->state != state)
1184                         continue;
1185                 get_nfs_open_context(ctx);
1186                 spin_unlock(&state->inode->i_lock);
1187                 return ctx;
1188         }
1189         spin_unlock(&state->inode->i_lock);
1190         return ERR_PTR(-ENOENT);
1191 }
1192
1193 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1194 {
1195         struct nfs4_opendata *opendata;
1196
1197         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1198         if (opendata == NULL)
1199                 return ERR_PTR(-ENOMEM);
1200         opendata->state = state;
1201         atomic_inc(&state->count);
1202         return opendata;
1203 }
1204
1205 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1206 {
1207         struct nfs4_state *newstate;
1208         int ret;
1209
1210         opendata->o_arg.open_flags = 0;
1211         opendata->o_arg.fmode = fmode;
1212         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1213         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1214         nfs4_init_opendata_res(opendata);
1215         ret = _nfs4_recover_proc_open(opendata);
1216         if (ret != 0)
1217                 return ret;
1218         newstate = nfs4_opendata_to_nfs4_state(opendata);
1219         if (IS_ERR(newstate))
1220                 return PTR_ERR(newstate);
1221         nfs4_close_state(newstate, fmode);
1222         *res = newstate;
1223         return 0;
1224 }
1225
1226 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1227 {
1228         struct nfs4_state *newstate;
1229         int ret;
1230
1231         /* memory barrier prior to reading state->n_* */
1232         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1233         smp_rmb();
1234         if (state->n_rdwr != 0) {
1235                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1236                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1237                 if (ret != 0)
1238                         return ret;
1239                 if (newstate != state)
1240                         return -ESTALE;
1241         }
1242         if (state->n_wronly != 0) {
1243                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1244                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1245                 if (ret != 0)
1246                         return ret;
1247                 if (newstate != state)
1248                         return -ESTALE;
1249         }
1250         if (state->n_rdonly != 0) {
1251                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1252                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1253                 if (ret != 0)
1254                         return ret;
1255                 if (newstate != state)
1256                         return -ESTALE;
1257         }
1258         /*
1259          * We may have performed cached opens for all three recoveries.
1260          * Check if we need to update the current stateid.
1261          */
1262         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1263             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1264                 write_seqlock(&state->seqlock);
1265                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1266                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1267                 write_sequnlock(&state->seqlock);
1268         }
1269         return 0;
1270 }
1271
1272 /*
1273  * OPEN_RECLAIM:
1274  *      reclaim state on the server after a reboot.
1275  */
1276 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1277 {
1278         struct nfs_delegation *delegation;
1279         struct nfs4_opendata *opendata;
1280         fmode_t delegation_type = 0;
1281         int status;
1282
1283         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1284         if (IS_ERR(opendata))
1285                 return PTR_ERR(opendata);
1286         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1287         opendata->o_arg.fh = NFS_FH(state->inode);
1288         rcu_read_lock();
1289         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1290         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1291                 delegation_type = delegation->type;
1292         rcu_read_unlock();
1293         opendata->o_arg.u.delegation_type = delegation_type;
1294         status = nfs4_open_recover(opendata, state);
1295         nfs4_opendata_put(opendata);
1296         return status;
1297 }
1298
1299 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1300 {
1301         struct nfs_server *server = NFS_SERVER(state->inode);
1302         struct nfs4_exception exception = { };
1303         int err;
1304         do {
1305                 err = _nfs4_do_open_reclaim(ctx, state);
1306                 if (err != -NFS4ERR_DELAY)
1307                         break;
1308                 nfs4_handle_exception(server, err, &exception);
1309         } while (exception.retry);
1310         return err;
1311 }
1312
1313 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1314 {
1315         struct nfs_open_context *ctx;
1316         int ret;
1317
1318         ctx = nfs4_state_find_open_context(state);
1319         if (IS_ERR(ctx))
1320                 return PTR_ERR(ctx);
1321         ret = nfs4_do_open_reclaim(ctx, state);
1322         put_nfs_open_context(ctx);
1323         return ret;
1324 }
1325
1326 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1327 {
1328         struct nfs4_opendata *opendata;
1329         int ret;
1330
1331         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1332         if (IS_ERR(opendata))
1333                 return PTR_ERR(opendata);
1334         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1335         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1336         ret = nfs4_open_recover(opendata, state);
1337         nfs4_opendata_put(opendata);
1338         return ret;
1339 }
1340
1341 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1342 {
1343         struct nfs4_exception exception = { };
1344         struct nfs_server *server = NFS_SERVER(state->inode);
1345         int err;
1346         do {
1347                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1348                 switch (err) {
1349                         case 0:
1350                         case -ENOENT:
1351                         case -ESTALE:
1352                                 goto out;
1353                         case -NFS4ERR_BADSESSION:
1354                         case -NFS4ERR_BADSLOT:
1355                         case -NFS4ERR_BAD_HIGH_SLOT:
1356                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1357                         case -NFS4ERR_DEADSESSION:
1358                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1359                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1360                                 err = -EAGAIN;
1361                                 goto out;
1362                         case -NFS4ERR_STALE_CLIENTID:
1363                         case -NFS4ERR_STALE_STATEID:
1364                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1365                         case -NFS4ERR_EXPIRED:
1366                                 /* Don't recall a delegation if it was lost */
1367                                 nfs4_schedule_lease_recovery(server->nfs_client);
1368                                 err = -EAGAIN;
1369                                 goto out;
1370                         case -NFS4ERR_DELEG_REVOKED:
1371                         case -NFS4ERR_ADMIN_REVOKED:
1372                         case -NFS4ERR_BAD_STATEID:
1373                                 nfs_inode_find_state_and_recover(state->inode,
1374                                                 stateid);
1375                                 nfs4_schedule_stateid_recovery(server, state);
1376                         case -ENOMEM:
1377                                 err = 0;
1378                                 goto out;
1379                 }
1380                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1381                 err = nfs4_handle_exception(server, err, &exception);
1382         } while (exception.retry);
1383 out:
1384         return err;
1385 }
1386
1387 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1388 {
1389         struct nfs4_opendata *data = calldata;
1390
1391         data->rpc_status = task->tk_status;
1392         if (data->rpc_status == 0) {
1393                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1394                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1395                 renew_lease(data->o_res.server, data->timestamp);
1396                 data->rpc_done = 1;
1397         }
1398 }
1399
1400 static void nfs4_open_confirm_release(void *calldata)
1401 {
1402         struct nfs4_opendata *data = calldata;
1403         struct nfs4_state *state = NULL;
1404
1405         /* If this request hasn't been cancelled, do nothing */
1406         if (data->cancelled == 0)
1407                 goto out_free;
1408         /* In case of error, no cleanup! */
1409         if (!data->rpc_done)
1410                 goto out_free;
1411         state = nfs4_opendata_to_nfs4_state(data);
1412         if (!IS_ERR(state))
1413                 nfs4_close_state(state, data->o_arg.fmode);
1414 out_free:
1415         nfs4_opendata_put(data);
1416 }
1417
1418 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1419         .rpc_call_done = nfs4_open_confirm_done,
1420         .rpc_release = nfs4_open_confirm_release,
1421 };
1422
1423 /*
1424  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1425  */
1426 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1427 {
1428         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1429         struct rpc_task *task;
1430         struct  rpc_message msg = {
1431                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1432                 .rpc_argp = &data->c_arg,
1433                 .rpc_resp = &data->c_res,
1434                 .rpc_cred = data->owner->so_cred,
1435         };
1436         struct rpc_task_setup task_setup_data = {
1437                 .rpc_client = server->client,
1438                 .rpc_message = &msg,
1439                 .callback_ops = &nfs4_open_confirm_ops,
1440                 .callback_data = data,
1441                 .workqueue = nfsiod_workqueue,
1442                 .flags = RPC_TASK_ASYNC,
1443         };
1444         int status;
1445
1446         kref_get(&data->kref);
1447         data->rpc_done = 0;
1448         data->rpc_status = 0;
1449         data->timestamp = jiffies;
1450         task = rpc_run_task(&task_setup_data);
1451         if (IS_ERR(task))
1452                 return PTR_ERR(task);
1453         status = nfs4_wait_for_completion_rpc_task(task);
1454         if (status != 0) {
1455                 data->cancelled = 1;
1456                 smp_wmb();
1457         } else
1458                 status = data->rpc_status;
1459         rpc_put_task(task);
1460         return status;
1461 }
1462
1463 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1464 {
1465         struct nfs4_opendata *data = calldata;
1466         struct nfs4_state_owner *sp = data->owner;
1467
1468         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1469                 return;
1470         /*
1471          * Check if we still need to send an OPEN call, or if we can use
1472          * a delegation instead.
1473          */
1474         if (data->state != NULL) {
1475                 struct nfs_delegation *delegation;
1476
1477                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1478                         goto out_no_action;
1479                 rcu_read_lock();
1480                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1481                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1482                     can_open_delegated(delegation, data->o_arg.fmode))
1483                         goto unlock_no_action;
1484                 rcu_read_unlock();
1485         }
1486         /* Update client id. */
1487         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1488         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1489                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1490                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1491                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1492         }
1493         data->timestamp = jiffies;
1494         if (nfs4_setup_sequence(data->o_arg.server,
1495                                 &data->o_arg.seq_args,
1496                                 &data->o_res.seq_res,
1497                                 task) != 0)
1498                 nfs_release_seqid(data->o_arg.seqid);
1499         return;
1500 unlock_no_action:
1501         rcu_read_unlock();
1502 out_no_action:
1503         task->tk_action = NULL;
1504         nfs4_sequence_done(task, &data->o_res.seq_res);
1505 }
1506
1507 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1508 {
1509         struct nfs4_opendata *data = calldata;
1510
1511         data->rpc_status = task->tk_status;
1512
1513         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1514                 return;
1515
1516         if (task->tk_status == 0) {
1517                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1518                         switch (data->o_res.f_attr->mode & S_IFMT) {
1519                         case S_IFREG:
1520                                 break;
1521                         case S_IFLNK:
1522                                 data->rpc_status = -ELOOP;
1523                                 break;
1524                         case S_IFDIR:
1525                                 data->rpc_status = -EISDIR;
1526                                 break;
1527                         default:
1528                                 data->rpc_status = -ENOTDIR;
1529                         }
1530                 }
1531                 renew_lease(data->o_res.server, data->timestamp);
1532                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1533                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1534         }
1535         data->rpc_done = 1;
1536 }
1537
1538 static void nfs4_open_release(void *calldata)
1539 {
1540         struct nfs4_opendata *data = calldata;
1541         struct nfs4_state *state = NULL;
1542
1543         /* If this request hasn't been cancelled, do nothing */
1544         if (data->cancelled == 0)
1545                 goto out_free;
1546         /* In case of error, no cleanup! */
1547         if (data->rpc_status != 0 || !data->rpc_done)
1548                 goto out_free;
1549         /* In case we need an open_confirm, no cleanup! */
1550         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1551                 goto out_free;
1552         state = nfs4_opendata_to_nfs4_state(data);
1553         if (!IS_ERR(state))
1554                 nfs4_close_state(state, data->o_arg.fmode);
1555 out_free:
1556         nfs4_opendata_put(data);
1557 }
1558
1559 static const struct rpc_call_ops nfs4_open_ops = {
1560         .rpc_call_prepare = nfs4_open_prepare,
1561         .rpc_call_done = nfs4_open_done,
1562         .rpc_release = nfs4_open_release,
1563 };
1564
1565 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1566 {
1567         struct inode *dir = data->dir->d_inode;
1568         struct nfs_server *server = NFS_SERVER(dir);
1569         struct nfs_openargs *o_arg = &data->o_arg;
1570         struct nfs_openres *o_res = &data->o_res;
1571         struct rpc_task *task;
1572         struct rpc_message msg = {
1573                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1574                 .rpc_argp = o_arg,
1575                 .rpc_resp = o_res,
1576                 .rpc_cred = data->owner->so_cred,
1577         };
1578         struct rpc_task_setup task_setup_data = {
1579                 .rpc_client = server->client,
1580                 .rpc_message = &msg,
1581                 .callback_ops = &nfs4_open_ops,
1582                 .callback_data = data,
1583                 .workqueue = nfsiod_workqueue,
1584                 .flags = RPC_TASK_ASYNC,
1585         };
1586         int status;
1587
1588         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1589         kref_get(&data->kref);
1590         data->rpc_done = 0;
1591         data->rpc_status = 0;
1592         data->cancelled = 0;
1593         if (isrecover)
1594                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1595         task = rpc_run_task(&task_setup_data);
1596         if (IS_ERR(task))
1597                 return PTR_ERR(task);
1598         status = nfs4_wait_for_completion_rpc_task(task);
1599         if (status != 0) {
1600                 data->cancelled = 1;
1601                 smp_wmb();
1602         } else
1603                 status = data->rpc_status;
1604         rpc_put_task(task);
1605
1606         return status;
1607 }
1608
1609 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1610 {
1611         struct inode *dir = data->dir->d_inode;
1612         struct nfs_openres *o_res = &data->o_res;
1613         int status;
1614
1615         status = nfs4_run_open_task(data, 1);
1616         if (status != 0 || !data->rpc_done)
1617                 return status;
1618
1619         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1620
1621         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1622                 status = _nfs4_proc_open_confirm(data);
1623                 if (status != 0)
1624                         return status;
1625         }
1626
1627         return status;
1628 }
1629
1630 static int nfs4_opendata_access(struct rpc_cred *cred,
1631                                 struct nfs4_opendata *opendata,
1632                                 struct nfs4_state *state, fmode_t fmode,
1633                                 int openflags)
1634 {
1635         struct nfs_access_entry cache;
1636         u32 mask;
1637
1638         /* access call failed or for some reason the server doesn't
1639          * support any access modes -- defer access call until later */
1640         if (opendata->o_res.access_supported == 0)
1641                 return 0;
1642
1643         mask = 0;
1644         /* don't check MAY_WRITE - a newly created file may not have
1645          * write mode bits, but POSIX allows the creating process to write.
1646          * use openflags to check for exec, because fmode won't
1647          * always have FMODE_EXEC set when file open for exec. */
1648         if (openflags & __FMODE_EXEC) {
1649                 /* ONLY check for exec rights */
1650                 mask = MAY_EXEC;
1651         } else if (fmode & FMODE_READ)
1652                 mask = MAY_READ;
1653
1654         cache.cred = cred;
1655         cache.jiffies = jiffies;
1656         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1657         nfs_access_add_cache(state->inode, &cache);
1658
1659         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1660                 return 0;
1661
1662         /* even though OPEN succeeded, access is denied. Close the file */
1663         nfs4_close_state(state, fmode);
1664         return -EACCES;
1665 }
1666
1667 /*
1668  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1669  */
1670 static int _nfs4_proc_open(struct nfs4_opendata *data)
1671 {
1672         struct inode *dir = data->dir->d_inode;
1673         struct nfs_server *server = NFS_SERVER(dir);
1674         struct nfs_openargs *o_arg = &data->o_arg;
1675         struct nfs_openres *o_res = &data->o_res;
1676         int status;
1677
1678         status = nfs4_run_open_task(data, 0);
1679         if (!data->rpc_done)
1680                 return status;
1681         if (status != 0) {
1682                 if (status == -NFS4ERR_BADNAME &&
1683                                 !(o_arg->open_flags & O_CREAT))
1684                         return -ENOENT;
1685                 return status;
1686         }
1687
1688         nfs_fattr_map_and_free_names(server, &data->f_attr);
1689
1690         if (o_arg->open_flags & O_CREAT)
1691                 update_changeattr(dir, &o_res->cinfo);
1692         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1693                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1694         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1695                 status = _nfs4_proc_open_confirm(data);
1696                 if (status != 0)
1697                         return status;
1698         }
1699         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1700                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1701         return 0;
1702 }
1703
1704 static int nfs4_recover_expired_lease(struct nfs_server *server)
1705 {
1706         return nfs4_client_recover_expired_lease(server->nfs_client);
1707 }
1708
1709 /*
1710  * OPEN_EXPIRED:
1711  *      reclaim state on the server after a network partition.
1712  *      Assumes caller holds the appropriate lock
1713  */
1714 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1715 {
1716         struct nfs4_opendata *opendata;
1717         int ret;
1718
1719         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1720         if (IS_ERR(opendata))
1721                 return PTR_ERR(opendata);
1722         ret = nfs4_open_recover(opendata, state);
1723         if (ret == -ESTALE)
1724                 d_drop(ctx->dentry);
1725         nfs4_opendata_put(opendata);
1726         return ret;
1727 }
1728
1729 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1730 {
1731         struct nfs_server *server = NFS_SERVER(state->inode);
1732         struct nfs4_exception exception = { };
1733         int err;
1734
1735         do {
1736                 err = _nfs4_open_expired(ctx, state);
1737                 switch (err) {
1738                 default:
1739                         goto out;
1740                 case -NFS4ERR_GRACE:
1741                 case -NFS4ERR_DELAY:
1742                         nfs4_handle_exception(server, err, &exception);
1743                         err = 0;
1744                 }
1745         } while (exception.retry);
1746 out:
1747         return err;
1748 }
1749
1750 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1751 {
1752         struct nfs_open_context *ctx;
1753         int ret;
1754
1755         ctx = nfs4_state_find_open_context(state);
1756         if (IS_ERR(ctx))
1757                 return PTR_ERR(ctx);
1758         ret = nfs4_do_open_expired(ctx, state);
1759         put_nfs_open_context(ctx);
1760         return ret;
1761 }
1762
1763 #if defined(CONFIG_NFS_V4_1)
1764 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1765 {
1766         struct nfs_server *server = NFS_SERVER(state->inode);
1767         nfs4_stateid *stateid = &state->stateid;
1768         int status;
1769
1770         /* If a state reset has been done, test_stateid is unneeded */
1771         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1772                 return;
1773
1774         status = nfs41_test_stateid(server, stateid);
1775         if (status != NFS_OK) {
1776                 /* Free the stateid unless the server explicitly
1777                  * informs us the stateid is unrecognized. */
1778                 if (status != -NFS4ERR_BAD_STATEID)
1779                         nfs41_free_stateid(server, stateid);
1780                 nfs_remove_bad_delegation(state->inode);
1781
1782                 write_seqlock(&state->seqlock);
1783                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1784                 write_sequnlock(&state->seqlock);
1785                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1786         }
1787 }
1788
1789 /**
1790  * nfs41_check_open_stateid - possibly free an open stateid
1791  *
1792  * @state: NFSv4 state for an inode
1793  *
1794  * Returns NFS_OK if recovery for this stateid is now finished.
1795  * Otherwise a negative NFS4ERR value is returned.
1796  */
1797 static int nfs41_check_open_stateid(struct nfs4_state *state)
1798 {
1799         struct nfs_server *server = NFS_SERVER(state->inode);
1800         nfs4_stateid *stateid = &state->open_stateid;
1801         int status;
1802
1803         /* If a state reset has been done, test_stateid is unneeded */
1804         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1805             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1806             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1807                 return -NFS4ERR_BAD_STATEID;
1808
1809         status = nfs41_test_stateid(server, stateid);
1810         if (status != NFS_OK) {
1811                 /* Free the stateid unless the server explicitly
1812                  * informs us the stateid is unrecognized. */
1813                 if (status != -NFS4ERR_BAD_STATEID)
1814                         nfs41_free_stateid(server, stateid);
1815
1816                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1817                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1818                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1819         }
1820         return status;
1821 }
1822
1823 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1824 {
1825         int status;
1826
1827         nfs41_clear_delegation_stateid(state);
1828         status = nfs41_check_open_stateid(state);
1829         if (status != NFS_OK)
1830                 status = nfs4_open_expired(sp, state);
1831         return status;
1832 }
1833 #endif
1834
1835 /*
1836  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1837  * fields corresponding to attributes that were used to store the verifier.
1838  * Make sure we clobber those fields in the later setattr call
1839  */
1840 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1841 {
1842         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1843             !(sattr->ia_valid & ATTR_ATIME_SET))
1844                 sattr->ia_valid |= ATTR_ATIME;
1845
1846         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1847             !(sattr->ia_valid & ATTR_MTIME_SET))
1848                 sattr->ia_valid |= ATTR_MTIME;
1849 }
1850
1851 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1852                 fmode_t fmode,
1853                 int flags,
1854                 struct nfs4_state **res)
1855 {
1856         struct nfs4_state_owner *sp = opendata->owner;
1857         struct nfs_server *server = sp->so_server;
1858         struct nfs4_state *state;
1859         unsigned int seq;
1860         int ret;
1861
1862         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1863
1864         ret = _nfs4_proc_open(opendata);
1865         if (ret != 0)
1866                 goto out;
1867
1868         state = nfs4_opendata_to_nfs4_state(opendata);
1869         ret = PTR_ERR(state);
1870         if (IS_ERR(state))
1871                 goto out;
1872         if (server->caps & NFS_CAP_POSIX_LOCK)
1873                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1874
1875         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1876         if (ret != 0)
1877                 goto out;
1878
1879         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
1880                 nfs4_schedule_stateid_recovery(server, state);
1881                 nfs4_wait_clnt_recover(server->nfs_client);
1882         }
1883         *res = state;
1884 out:
1885         return ret;
1886 }
1887
1888 /*
1889  * Returns a referenced nfs4_state
1890  */
1891 static int _nfs4_do_open(struct inode *dir,
1892                         struct dentry *dentry,
1893                         fmode_t fmode,
1894                         int flags,
1895                         struct iattr *sattr,
1896                         struct rpc_cred *cred,
1897                         struct nfs4_state **res,
1898                         struct nfs4_threshold **ctx_th)
1899 {
1900         struct nfs4_state_owner  *sp;
1901         struct nfs4_state     *state = NULL;
1902         struct nfs_server       *server = NFS_SERVER(dir);
1903         struct nfs4_opendata *opendata;
1904         int status;
1905
1906         /* Protect against reboot recovery conflicts */
1907         status = -ENOMEM;
1908         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1909         if (sp == NULL) {
1910                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1911                 goto out_err;
1912         }
1913         status = nfs4_recover_expired_lease(server);
1914         if (status != 0)
1915                 goto err_put_state_owner;
1916         if (dentry->d_inode != NULL)
1917                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1918         status = -ENOMEM;
1919         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1920         if (opendata == NULL)
1921                 goto err_put_state_owner;
1922
1923         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1924                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1925                 if (!opendata->f_attr.mdsthreshold)
1926                         goto err_opendata_put;
1927                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1928         }
1929         if (dentry->d_inode != NULL)
1930                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1931
1932         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1933         if (status != 0)
1934                 goto err_opendata_put;
1935
1936         if (opendata->o_arg.open_flags & O_EXCL) {
1937                 nfs4_exclusive_attrset(opendata, sattr);
1938
1939                 nfs_fattr_init(opendata->o_res.f_attr);
1940                 status = nfs4_do_setattr(state->inode, cred,
1941                                 opendata->o_res.f_attr, sattr,
1942                                 state);
1943                 if (status == 0)
1944                         nfs_setattr_update_inode(state->inode, sattr);
1945                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1946         }
1947
1948         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1949                 *ctx_th = opendata->f_attr.mdsthreshold;
1950         else
1951                 kfree(opendata->f_attr.mdsthreshold);
1952         opendata->f_attr.mdsthreshold = NULL;
1953
1954         nfs4_opendata_put(opendata);
1955         nfs4_put_state_owner(sp);
1956         *res = state;
1957         return 0;
1958 err_opendata_put:
1959         kfree(opendata->f_attr.mdsthreshold);
1960         nfs4_opendata_put(opendata);
1961 err_put_state_owner:
1962         nfs4_put_state_owner(sp);
1963 out_err:
1964         *res = NULL;
1965         return status;
1966 }
1967
1968
1969 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1970                                         struct dentry *dentry,
1971                                         fmode_t fmode,
1972                                         int flags,
1973                                         struct iattr *sattr,
1974                                         struct rpc_cred *cred,
1975                                         struct nfs4_threshold **ctx_th)
1976 {
1977         struct nfs4_exception exception = { };
1978         struct nfs4_state *res;
1979         int status;
1980
1981         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1982         do {
1983                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1984                                        &res, ctx_th);
1985                 if (status == 0)
1986                         break;
1987                 /* NOTE: BAD_SEQID means the server and client disagree about the
1988                  * book-keeping w.r.t. state-changing operations
1989                  * (OPEN/CLOSE/LOCK/LOCKU...)
1990                  * It is actually a sign of a bug on the client or on the server.
1991                  *
1992                  * If we receive a BAD_SEQID error in the particular case of
1993                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1994                  * have unhashed the old state_owner for us, and that we can
1995                  * therefore safely retry using a new one. We should still warn
1996                  * the user though...
1997                  */
1998                 if (status == -NFS4ERR_BAD_SEQID) {
1999                         pr_warn_ratelimited("NFS: v4 server %s "
2000                                         " returned a bad sequence-id error!\n",
2001                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2002                         exception.retry = 1;
2003                         continue;
2004                 }
2005                 /*
2006                  * BAD_STATEID on OPEN means that the server cancelled our
2007                  * state before it received the OPEN_CONFIRM.
2008                  * Recover by retrying the request as per the discussion
2009                  * on Page 181 of RFC3530.
2010                  */
2011                 if (status == -NFS4ERR_BAD_STATEID) {
2012                         exception.retry = 1;
2013                         continue;
2014                 }
2015                 if (status == -EAGAIN) {
2016                         /* We must have found a delegation */
2017                         exception.retry = 1;
2018                         continue;
2019                 }
2020                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2021                                         status, &exception));
2022         } while (exception.retry);
2023         return res;
2024 }
2025
2026 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2027                             struct nfs_fattr *fattr, struct iattr *sattr,
2028                             struct nfs4_state *state)
2029 {
2030         struct nfs_server *server = NFS_SERVER(inode);
2031         struct nfs_setattrargs  arg = {
2032                 .fh             = NFS_FH(inode),
2033                 .iap            = sattr,
2034                 .server         = server,
2035                 .bitmask = server->attr_bitmask,
2036         };
2037         struct nfs_setattrres  res = {
2038                 .fattr          = fattr,
2039                 .server         = server,
2040         };
2041         struct rpc_message msg = {
2042                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2043                 .rpc_argp       = &arg,
2044                 .rpc_resp       = &res,
2045                 .rpc_cred       = cred,
2046         };
2047         unsigned long timestamp = jiffies;
2048         int status;
2049
2050         nfs_fattr_init(fattr);
2051
2052         if (state != NULL) {
2053                 struct nfs_lockowner lockowner = {
2054                         .l_owner = current->files,
2055                         .l_pid = current->tgid,
2056                 };
2057                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2058                                 &lockowner);
2059         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2060                                 FMODE_WRITE)) {
2061                 /* Use that stateid */
2062         } else
2063                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2064
2065         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2066         if (status == 0 && state != NULL)
2067                 renew_lease(server, timestamp);
2068         return status;
2069 }
2070
2071 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2072                            struct nfs_fattr *fattr, struct iattr *sattr,
2073                            struct nfs4_state *state)
2074 {
2075         struct nfs_server *server = NFS_SERVER(inode);
2076         struct nfs4_exception exception = {
2077                 .state = state,
2078                 .inode = inode,
2079         };
2080         int err;
2081         do {
2082                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2083                 switch (err) {
2084                 case -NFS4ERR_OPENMODE:
2085                         if (state && !(state->state & FMODE_WRITE)) {
2086                                 err = -EBADF;
2087                                 if (sattr->ia_valid & ATTR_OPEN)
2088                                         err = -EACCES;
2089                                 goto out;
2090                         }
2091                 }
2092                 err = nfs4_handle_exception(server, err, &exception);
2093         } while (exception.retry);
2094 out:
2095         return err;
2096 }
2097
2098 struct nfs4_closedata {
2099         struct inode *inode;
2100         struct nfs4_state *state;
2101         struct nfs_closeargs arg;
2102         struct nfs_closeres res;
2103         struct nfs_fattr fattr;
2104         unsigned long timestamp;
2105         bool roc;
2106         u32 roc_barrier;
2107 };
2108
2109 static void nfs4_free_closedata(void *data)
2110 {
2111         struct nfs4_closedata *calldata = data;
2112         struct nfs4_state_owner *sp = calldata->state->owner;
2113         struct super_block *sb = calldata->state->inode->i_sb;
2114
2115         if (calldata->roc)
2116                 pnfs_roc_release(calldata->state->inode);
2117         nfs4_put_open_state(calldata->state);
2118         nfs_free_seqid(calldata->arg.seqid);
2119         nfs4_put_state_owner(sp);
2120         nfs_sb_deactive(sb);
2121         kfree(calldata);
2122 }
2123
2124 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2125                 fmode_t fmode)
2126 {
2127         spin_lock(&state->owner->so_lock);
2128         if (!(fmode & FMODE_READ))
2129                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2130         if (!(fmode & FMODE_WRITE))
2131                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2132         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2133         spin_unlock(&state->owner->so_lock);
2134 }
2135
2136 static void nfs4_close_done(struct rpc_task *task, void *data)
2137 {
2138         struct nfs4_closedata *calldata = data;
2139         struct nfs4_state *state = calldata->state;
2140         struct nfs_server *server = NFS_SERVER(calldata->inode);
2141
2142         dprintk("%s: begin!\n", __func__);
2143         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2144                 return;
2145         /* hmm. we are done with the inode, and in the process of freeing
2146          * the state_owner. we keep this around to process errors
2147          */
2148         switch (task->tk_status) {
2149                 case 0:
2150                         if (calldata->roc)
2151                                 pnfs_roc_set_barrier(state->inode,
2152                                                      calldata->roc_barrier);
2153                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2154                         renew_lease(server, calldata->timestamp);
2155                         nfs4_close_clear_stateid_flags(state,
2156                                         calldata->arg.fmode);
2157                         break;
2158                 case -NFS4ERR_STALE_STATEID:
2159                 case -NFS4ERR_OLD_STATEID:
2160                 case -NFS4ERR_BAD_STATEID:
2161                 case -NFS4ERR_EXPIRED:
2162                         if (calldata->arg.fmode == 0)
2163                                 break;
2164                 default:
2165                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2166                                 rpc_restart_call_prepare(task);
2167         }
2168         nfs_release_seqid(calldata->arg.seqid);
2169         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2170         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2171 }
2172
2173 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2174 {
2175         struct nfs4_closedata *calldata = data;
2176         struct nfs4_state *state = calldata->state;
2177         struct inode *inode = calldata->inode;
2178         int call_close = 0;
2179
2180         dprintk("%s: begin!\n", __func__);
2181         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2182                 return;
2183
2184         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2185         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2186         spin_lock(&state->owner->so_lock);
2187         /* Calculate the change in open mode */
2188         if (state->n_rdwr == 0) {
2189                 if (state->n_rdonly == 0) {
2190                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2191                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2192                         calldata->arg.fmode &= ~FMODE_READ;
2193                 }
2194                 if (state->n_wronly == 0) {
2195                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2196                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2197                         calldata->arg.fmode &= ~FMODE_WRITE;
2198                 }
2199         }
2200         spin_unlock(&state->owner->so_lock);
2201
2202         if (!call_close) {
2203                 /* Note: exit _without_ calling nfs4_close_done */
2204                 task->tk_action = NULL;
2205                 nfs4_sequence_done(task, &calldata->res.seq_res);
2206                 goto out;
2207         }
2208
2209         if (calldata->arg.fmode == 0) {
2210                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2211                 if (calldata->roc &&
2212                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2213                         goto out;
2214         }
2215
2216         nfs_fattr_init(calldata->res.fattr);
2217         calldata->timestamp = jiffies;
2218         if (nfs4_setup_sequence(NFS_SERVER(inode),
2219                                 &calldata->arg.seq_args,
2220                                 &calldata->res.seq_res,
2221                                 task) != 0)
2222                 nfs_release_seqid(calldata->arg.seqid);
2223 out:
2224         dprintk("%s: done!\n", __func__);
2225 }
2226
2227 static const struct rpc_call_ops nfs4_close_ops = {
2228         .rpc_call_prepare = nfs4_close_prepare,
2229         .rpc_call_done = nfs4_close_done,
2230         .rpc_release = nfs4_free_closedata,
2231 };
2232
2233 /*
2234  * It is possible for data to be read/written from a mem-mapped file
2235  * after the sys_close call (which hits the vfs layer as a flush).
2236  * This means that we can't safely call nfsv4 close on a file until
2237  * the inode is cleared. This in turn means that we are not good
2238  * NFSv4 citizens - we do not indicate to the server to update the file's
2239  * share state even when we are done with one of the three share
2240  * stateid's in the inode.
2241  *
2242  * NOTE: Caller must be holding the sp->so_owner semaphore!
2243  */
2244 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2245 {
2246         struct nfs_server *server = NFS_SERVER(state->inode);
2247         struct nfs4_closedata *calldata;
2248         struct nfs4_state_owner *sp = state->owner;
2249         struct rpc_task *task;
2250         struct rpc_message msg = {
2251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2252                 .rpc_cred = state->owner->so_cred,
2253         };
2254         struct rpc_task_setup task_setup_data = {
2255                 .rpc_client = server->client,
2256                 .rpc_message = &msg,
2257                 .callback_ops = &nfs4_close_ops,
2258                 .workqueue = nfsiod_workqueue,
2259                 .flags = RPC_TASK_ASYNC,
2260         };
2261         int status = -ENOMEM;
2262
2263         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2264         if (calldata == NULL)
2265                 goto out;
2266         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2267         calldata->inode = state->inode;
2268         calldata->state = state;
2269         calldata->arg.fh = NFS_FH(state->inode);
2270         calldata->arg.stateid = &state->open_stateid;
2271         /* Serialization for the sequence id */
2272         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2273         if (calldata->arg.seqid == NULL)
2274                 goto out_free_calldata;
2275         calldata->arg.fmode = 0;
2276         calldata->arg.bitmask = server->cache_consistency_bitmask;
2277         calldata->res.fattr = &calldata->fattr;
2278         calldata->res.seqid = calldata->arg.seqid;
2279         calldata->res.server = server;
2280         calldata->roc = pnfs_roc(state->inode);
2281         nfs_sb_active(calldata->inode->i_sb);
2282
2283         msg.rpc_argp = &calldata->arg;
2284         msg.rpc_resp = &calldata->res;
2285         task_setup_data.callback_data = calldata;
2286         task = rpc_run_task(&task_setup_data);
2287         if (IS_ERR(task))
2288                 return PTR_ERR(task);
2289         status = 0;
2290         if (wait)
2291                 status = rpc_wait_for_completion_task(task);
2292         rpc_put_task(task);
2293         return status;
2294 out_free_calldata:
2295         kfree(calldata);
2296 out:
2297         nfs4_put_open_state(state);
2298         nfs4_put_state_owner(sp);
2299         return status;
2300 }
2301
2302 static struct inode *
2303 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2304 {
2305         struct nfs4_state *state;
2306
2307         /* Protect against concurrent sillydeletes */
2308         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2309                              ctx->cred, &ctx->mdsthreshold);
2310         if (IS_ERR(state))
2311                 return ERR_CAST(state);
2312         ctx->state = state;
2313         return igrab(state->inode);
2314 }
2315
2316 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2317 {
2318         if (ctx->state == NULL)
2319                 return;
2320         if (is_sync)
2321                 nfs4_close_sync(ctx->state, ctx->mode);
2322         else
2323                 nfs4_close_state(ctx->state, ctx->mode);
2324 }
2325
2326 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2327 {
2328         struct nfs4_server_caps_arg args = {
2329                 .fhandle = fhandle,
2330         };
2331         struct nfs4_server_caps_res res = {};
2332         struct rpc_message msg = {
2333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2334                 .rpc_argp = &args,
2335                 .rpc_resp = &res,
2336         };
2337         int status;
2338
2339         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2340         if (status == 0) {
2341                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2342                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2343                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2344                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2345                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2346                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2347                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2348                         server->caps |= NFS_CAP_ACLS;
2349                 if (res.has_links != 0)
2350                         server->caps |= NFS_CAP_HARDLINKS;
2351                 if (res.has_symlinks != 0)
2352                         server->caps |= NFS_CAP_SYMLINKS;
2353                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2354                         server->caps |= NFS_CAP_FILEID;
2355                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2356                         server->caps |= NFS_CAP_MODE;
2357                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2358                         server->caps |= NFS_CAP_NLINK;
2359                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2360                         server->caps |= NFS_CAP_OWNER;
2361                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2362                         server->caps |= NFS_CAP_OWNER_GROUP;
2363                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2364                         server->caps |= NFS_CAP_ATIME;
2365                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2366                         server->caps |= NFS_CAP_CTIME;
2367                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2368                         server->caps |= NFS_CAP_MTIME;
2369
2370                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2371                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2372                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2373                 server->acl_bitmask = res.acl_bitmask;
2374                 server->fh_expire_type = res.fh_expire_type;
2375         }
2376
2377         return status;
2378 }
2379
2380 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2381 {
2382         struct nfs4_exception exception = { };
2383         int err;
2384         do {
2385                 err = nfs4_handle_exception(server,
2386                                 _nfs4_server_capabilities(server, fhandle),
2387                                 &exception);
2388         } while (exception.retry);
2389         return err;
2390 }
2391
2392 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2393                 struct nfs_fsinfo *info)
2394 {
2395         struct nfs4_lookup_root_arg args = {
2396                 .bitmask = nfs4_fattr_bitmap,
2397         };
2398         struct nfs4_lookup_res res = {
2399                 .server = server,
2400                 .fattr = info->fattr,
2401                 .fh = fhandle,
2402         };
2403         struct rpc_message msg = {
2404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2405                 .rpc_argp = &args,
2406                 .rpc_resp = &res,
2407         };
2408
2409         nfs_fattr_init(info->fattr);
2410         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2411 }
2412
2413 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2414                 struct nfs_fsinfo *info)
2415 {
2416         struct nfs4_exception exception = { };
2417         int err;
2418         do {
2419                 err = _nfs4_lookup_root(server, fhandle, info);
2420                 switch (err) {
2421                 case 0:
2422                 case -NFS4ERR_WRONGSEC:
2423                         goto out;
2424                 default:
2425                         err = nfs4_handle_exception(server, err, &exception);
2426                 }
2427         } while (exception.retry);
2428 out:
2429         return err;
2430 }
2431
2432 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2433                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2434 {
2435         struct rpc_auth *auth;
2436         int ret;
2437
2438         auth = rpcauth_create(flavor, server->client);
2439         if (IS_ERR(auth)) {
2440                 ret = -EIO;
2441                 goto out;
2442         }
2443         ret = nfs4_lookup_root(server, fhandle, info);
2444 out:
2445         return ret;
2446 }
2447
2448 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2449                               struct nfs_fsinfo *info)
2450 {
2451         int i, len, status = 0;
2452         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2453
2454         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2455         if (len < 0)
2456                 return len;
2457
2458         for (i = 0; i < len; i++) {
2459                 /* AUTH_UNIX is the default flavor if none was specified,
2460                  * thus has already been tried. */
2461                 if (flav_array[i] == RPC_AUTH_UNIX)
2462                         continue;
2463
2464                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2465                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2466                         continue;
2467                 break;
2468         }
2469         /*
2470          * -EACCESS could mean that the user doesn't have correct permissions
2471          * to access the mount.  It could also mean that we tried to mount
2472          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2473          * existing mount programs don't handle -EACCES very well so it should
2474          * be mapped to -EPERM instead.
2475          */
2476         if (status == -EACCES)
2477                 status = -EPERM;
2478         return status;
2479 }
2480
2481 /*
2482  * get the file handle for the "/" directory on the server
2483  */
2484 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2485                          struct nfs_fsinfo *info)
2486 {
2487         int minor_version = server->nfs_client->cl_minorversion;
2488         int status = nfs4_lookup_root(server, fhandle, info);
2489         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2490                 /*
2491                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2492                  * by nfs4_map_errors() as this function exits.
2493                  */
2494                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2495         if (status == 0)
2496                 status = nfs4_server_capabilities(server, fhandle);
2497         if (status == 0)
2498                 status = nfs4_do_fsinfo(server, fhandle, info);
2499         return nfs4_map_errors(status);
2500 }
2501
2502 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2503                               struct nfs_fsinfo *info)
2504 {
2505         int error;
2506         struct nfs_fattr *fattr = info->fattr;
2507
2508         error = nfs4_server_capabilities(server, mntfh);
2509         if (error < 0) {
2510                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2511                 return error;
2512         }
2513
2514         error = nfs4_proc_getattr(server, mntfh, fattr);
2515         if (error < 0) {
2516                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2517                 return error;
2518         }
2519
2520         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2521             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2522                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2523
2524         return error;
2525 }
2526
2527 /*
2528  * Get locations and (maybe) other attributes of a referral.
2529  * Note that we'll actually follow the referral later when
2530  * we detect fsid mismatch in inode revalidation
2531  */
2532 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2533                              const struct qstr *name, struct nfs_fattr *fattr,
2534                              struct nfs_fh *fhandle)
2535 {
2536         int status = -ENOMEM;
2537         struct page *page = NULL;
2538         struct nfs4_fs_locations *locations = NULL;
2539
2540         page = alloc_page(GFP_KERNEL);
2541         if (page == NULL)
2542                 goto out;
2543         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2544         if (locations == NULL)
2545                 goto out;
2546
2547         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2548         if (status != 0)
2549                 goto out;
2550         /* Make sure server returned a different fsid for the referral */
2551         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2552                 dprintk("%s: server did not return a different fsid for"
2553                         " a referral at %s\n", __func__, name->name);
2554                 status = -EIO;
2555                 goto out;
2556         }
2557         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2558         nfs_fixup_referral_attributes(&locations->fattr);
2559
2560         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2561         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2562         memset(fhandle, 0, sizeof(struct nfs_fh));
2563 out:
2564         if (page)
2565                 __free_page(page);
2566         kfree(locations);
2567         return status;
2568 }
2569
2570 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2571 {
2572         struct nfs4_getattr_arg args = {
2573                 .fh = fhandle,
2574                 .bitmask = server->attr_bitmask,
2575         };
2576         struct nfs4_getattr_res res = {
2577                 .fattr = fattr,
2578                 .server = server,
2579         };
2580         struct rpc_message msg = {
2581                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2582                 .rpc_argp = &args,
2583                 .rpc_resp = &res,
2584         };
2585
2586         nfs_fattr_init(fattr);
2587         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2588 }
2589
2590 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2591 {
2592         struct nfs4_exception exception = { };
2593         int err;
2594         do {
2595                 err = nfs4_handle_exception(server,
2596                                 _nfs4_proc_getattr(server, fhandle, fattr),
2597                                 &exception);
2598         } while (exception.retry);
2599         return err;
2600 }
2601
2602 /*
2603  * The file is not closed if it is opened due to the a request to change
2604  * the size of the file. The open call will not be needed once the
2605  * VFS layer lookup-intents are implemented.
2606  *
2607  * Close is called when the inode is destroyed.
2608  * If we haven't opened the file for O_WRONLY, we
2609  * need to in the size_change case to obtain a stateid.
2610  *
2611  * Got race?
2612  * Because OPEN is always done by name in nfsv4, it is
2613  * possible that we opened a different file by the same
2614  * name.  We can recognize this race condition, but we
2615  * can't do anything about it besides returning an error.
2616  *
2617  * This will be fixed with VFS changes (lookup-intent).
2618  */
2619 static int
2620 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2621                   struct iattr *sattr)
2622 {
2623         struct inode *inode = dentry->d_inode;
2624         struct rpc_cred *cred = NULL;
2625         struct nfs4_state *state = NULL;
2626         int status;
2627
2628         if (pnfs_ld_layoutret_on_setattr(inode))
2629                 pnfs_return_layout(inode);
2630
2631         nfs_fattr_init(fattr);
2632
2633         /* Deal with open(O_TRUNC) */
2634         if (sattr->ia_valid & ATTR_OPEN)
2635                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2636
2637         /* Optimization: if the end result is no change, don't RPC */
2638         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2639                 return 0;
2640
2641         /* Search for an existing open(O_WRITE) file */
2642         if (sattr->ia_valid & ATTR_FILE) {
2643                 struct nfs_open_context *ctx;
2644
2645                 ctx = nfs_file_open_context(sattr->ia_file);
2646                 if (ctx) {
2647                         cred = ctx->cred;
2648                         state = ctx->state;
2649                 }
2650         }
2651
2652         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2653         if (status == 0)
2654                 nfs_setattr_update_inode(inode, sattr);
2655         return status;
2656 }
2657
2658 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2659                 const struct qstr *name, struct nfs_fh *fhandle,
2660                 struct nfs_fattr *fattr)
2661 {
2662         struct nfs_server *server = NFS_SERVER(dir);
2663         int                    status;
2664         struct nfs4_lookup_arg args = {
2665                 .bitmask = server->attr_bitmask,
2666                 .dir_fh = NFS_FH(dir),
2667                 .name = name,
2668         };
2669         struct nfs4_lookup_res res = {
2670                 .server = server,
2671                 .fattr = fattr,
2672                 .fh = fhandle,
2673         };
2674         struct rpc_message msg = {
2675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2676                 .rpc_argp = &args,
2677                 .rpc_resp = &res,
2678         };
2679
2680         nfs_fattr_init(fattr);
2681
2682         dprintk("NFS call  lookup %s\n", name->name);
2683         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2684         dprintk("NFS reply lookup: %d\n", status);
2685         return status;
2686 }
2687
2688 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2689 {
2690         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2691                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2692         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2693         fattr->nlink = 2;
2694 }
2695
2696 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2697                                    struct qstr *name, struct nfs_fh *fhandle,
2698                                    struct nfs_fattr *fattr)
2699 {
2700         struct nfs4_exception exception = { };
2701         struct rpc_clnt *client = *clnt;
2702         int err;
2703         do {
2704                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2705                 switch (err) {
2706                 case -NFS4ERR_BADNAME:
2707                         err = -ENOENT;
2708                         goto out;
2709                 case -NFS4ERR_MOVED:
2710                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2711                         goto out;
2712                 case -NFS4ERR_WRONGSEC:
2713                         err = -EPERM;
2714                         if (client != *clnt)
2715                                 goto out;
2716
2717                         client = nfs4_create_sec_client(client, dir, name);
2718                         if (IS_ERR(client))
2719                                 return PTR_ERR(client);
2720
2721                         exception.retry = 1;
2722                         break;
2723                 default:
2724                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2725                 }
2726         } while (exception.retry);
2727
2728 out:
2729         if (err == 0)
2730                 *clnt = client;
2731         else if (client != *clnt)
2732                 rpc_shutdown_client(client);
2733
2734         return err;
2735 }
2736
2737 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2738                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2739 {
2740         int status;
2741         struct rpc_clnt *client = NFS_CLIENT(dir);
2742
2743         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2744         if (client != NFS_CLIENT(dir)) {
2745                 rpc_shutdown_client(client);
2746                 nfs_fixup_secinfo_attributes(fattr);
2747         }
2748         return status;
2749 }
2750
2751 struct rpc_clnt *
2752 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2753                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2754 {
2755         int status;
2756         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2757
2758         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2759         if (status < 0) {
2760                 rpc_shutdown_client(client);
2761                 return ERR_PTR(status);
2762         }
2763         return client;
2764 }
2765
2766 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2767 {
2768         struct nfs_server *server = NFS_SERVER(inode);
2769         struct nfs4_accessargs args = {
2770                 .fh = NFS_FH(inode),
2771                 .bitmask = server->cache_consistency_bitmask,
2772         };
2773         struct nfs4_accessres res = {
2774                 .server = server,
2775         };
2776         struct rpc_message msg = {
2777                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2778                 .rpc_argp = &args,
2779                 .rpc_resp = &res,
2780                 .rpc_cred = entry->cred,
2781         };
2782         int mode = entry->mask;
2783         int status;
2784
2785         /*
2786          * Determine which access bits we want to ask for...
2787          */
2788         if (mode & MAY_READ)
2789                 args.access |= NFS4_ACCESS_READ;
2790         if (S_ISDIR(inode->i_mode)) {
2791                 if (mode & MAY_WRITE)
2792                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2793                 if (mode & MAY_EXEC)
2794                         args.access |= NFS4_ACCESS_LOOKUP;
2795         } else {
2796                 if (mode & MAY_WRITE)
2797                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2798                 if (mode & MAY_EXEC)
2799                         args.access |= NFS4_ACCESS_EXECUTE;
2800         }
2801
2802         res.fattr = nfs_alloc_fattr();
2803         if (res.fattr == NULL)
2804                 return -ENOMEM;
2805
2806         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2807         if (!status) {
2808                 nfs_access_set_mask(entry, res.access);
2809                 nfs_refresh_inode(inode, res.fattr);
2810         }
2811         nfs_free_fattr(res.fattr);
2812         return status;
2813 }
2814
2815 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2816 {
2817         struct nfs4_exception exception = { };
2818         int err;
2819         do {
2820                 err = nfs4_handle_exception(NFS_SERVER(inode),
2821                                 _nfs4_proc_access(inode, entry),
2822                                 &exception);
2823         } while (exception.retry);
2824         return err;
2825 }
2826
2827 /*
2828  * TODO: For the time being, we don't try to get any attributes
2829  * along with any of the zero-copy operations READ, READDIR,
2830  * READLINK, WRITE.
2831  *
2832  * In the case of the first three, we want to put the GETATTR
2833  * after the read-type operation -- this is because it is hard
2834  * to predict the length of a GETATTR response in v4, and thus
2835  * align the READ data correctly.  This means that the GETATTR
2836  * may end up partially falling into the page cache, and we should
2837  * shift it into the 'tail' of the xdr_buf before processing.
2838  * To do this efficiently, we need to know the total length
2839  * of data received, which doesn't seem to be available outside
2840  * of the RPC layer.
2841  *
2842  * In the case of WRITE, we also want to put the GETATTR after
2843  * the operation -- in this case because we want to make sure
2844  * we get the post-operation mtime and size.
2845  *
2846  * Both of these changes to the XDR layer would in fact be quite
2847  * minor, but I decided to leave them for a subsequent patch.
2848  */
2849 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2850                 unsigned int pgbase, unsigned int pglen)
2851 {
2852         struct nfs4_readlink args = {
2853                 .fh       = NFS_FH(inode),
2854                 .pgbase   = pgbase,
2855                 .pglen    = pglen,
2856                 .pages    = &page,
2857         };
2858         struct nfs4_readlink_res res;
2859         struct rpc_message msg = {
2860                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2861                 .rpc_argp = &args,
2862                 .rpc_resp = &res,
2863         };
2864
2865         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2866 }
2867
2868 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2869                 unsigned int pgbase, unsigned int pglen)
2870 {
2871         struct nfs4_exception exception = { };
2872         int err;
2873         do {
2874                 err = nfs4_handle_exception(NFS_SERVER(inode),
2875                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2876                                 &exception);
2877         } while (exception.retry);
2878         return err;
2879 }
2880
2881 /*
2882  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2883  */
2884 static int
2885 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2886                  int flags)
2887 {
2888         struct nfs_open_context *ctx;
2889         struct nfs4_state *state;
2890         int status = 0;
2891
2892         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2893         if (IS_ERR(ctx))
2894                 return PTR_ERR(ctx);
2895
2896         sattr->ia_mode &= ~current_umask();
2897         state = nfs4_do_open(dir, dentry, ctx->mode,
2898                         flags, sattr, ctx->cred,
2899                         &ctx->mdsthreshold);
2900         d_drop(dentry);
2901         if (IS_ERR(state)) {
2902                 status = PTR_ERR(state);
2903                 goto out;
2904         }
2905         d_add(dentry, igrab(state->inode));
2906         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2907         ctx->state = state;
2908 out:
2909         put_nfs_open_context(ctx);
2910         return status;
2911 }
2912
2913 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2914 {
2915         struct nfs_server *server = NFS_SERVER(dir);
2916         struct nfs_removeargs args = {
2917                 .fh = NFS_FH(dir),
2918                 .name = *name,
2919         };
2920         struct nfs_removeres res = {
2921                 .server = server,
2922         };
2923         struct rpc_message msg = {
2924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2925                 .rpc_argp = &args,
2926                 .rpc_resp = &res,
2927         };
2928         int status;
2929
2930         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2931         if (status == 0)
2932                 update_changeattr(dir, &res.cinfo);
2933         return status;
2934 }
2935
2936 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2937 {
2938         struct nfs4_exception exception = { };
2939         int err;
2940         do {
2941                 err = nfs4_handle_exception(NFS_SERVER(dir),
2942                                 _nfs4_proc_remove(dir, name),
2943                                 &exception);
2944         } while (exception.retry);
2945         return err;
2946 }
2947
2948 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2949 {
2950         struct nfs_server *server = NFS_SERVER(dir);
2951         struct nfs_removeargs *args = msg->rpc_argp;
2952         struct nfs_removeres *res = msg->rpc_resp;
2953
2954         res->server = server;
2955         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2956         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2957 }
2958
2959 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2960 {
2961         nfs4_setup_sequence(NFS_SERVER(data->dir),
2962                         &data->args.seq_args,
2963                         &data->res.seq_res,
2964                         task);
2965 }
2966
2967 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2968 {
2969         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2970
2971         if (!nfs4_sequence_done(task, &res->seq_res))
2972                 return 0;
2973         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2974                 return 0;
2975         update_changeattr(dir, &res->cinfo);
2976         return 1;
2977 }
2978
2979 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2980 {
2981         struct nfs_server *server = NFS_SERVER(dir);
2982         struct nfs_renameargs *arg = msg->rpc_argp;
2983         struct nfs_renameres *res = msg->rpc_resp;
2984
2985         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2986         res->server = server;
2987         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2988 }
2989
2990 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2991 {
2992         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2993                         &data->args.seq_args,
2994                         &data->res.seq_res,
2995                         task);
2996 }
2997
2998 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2999                                  struct inode *new_dir)
3000 {
3001         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3002
3003         if (!nfs4_sequence_done(task, &res->seq_res))
3004                 return 0;
3005         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3006                 return 0;
3007
3008         update_changeattr(old_dir, &res->old_cinfo);
3009         update_changeattr(new_dir, &res->new_cinfo);
3010         return 1;
3011 }
3012
3013 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3014                 struct inode *new_dir, struct qstr *new_name)
3015 {
3016         struct nfs_server *server = NFS_SERVER(old_dir);
3017         struct nfs_renameargs arg = {
3018                 .old_dir = NFS_FH(old_dir),
3019                 .new_dir = NFS_FH(new_dir),
3020                 .old_name = old_name,
3021                 .new_name = new_name,
3022         };
3023         struct nfs_renameres res = {
3024                 .server = server,
3025         };
3026         struct rpc_message msg = {
3027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3028                 .rpc_argp = &arg,
3029                 .rpc_resp = &res,
3030         };
3031         int status = -ENOMEM;
3032
3033         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3034         if (!status) {
3035                 update_changeattr(old_dir, &res.old_cinfo);
3036                 update_changeattr(new_dir, &res.new_cinfo);
3037         }
3038         return status;
3039 }
3040
3041 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3042                 struct inode *new_dir, struct qstr *new_name)
3043 {
3044         struct nfs4_exception exception = { };
3045         int err;
3046         do {
3047                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3048                                 _nfs4_proc_rename(old_dir, old_name,
3049                                         new_dir, new_name),
3050                                 &exception);
3051         } while (exception.retry);
3052         return err;
3053 }
3054
3055 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3056 {
3057         struct nfs_server *server = NFS_SERVER(inode);
3058         struct nfs4_link_arg arg = {
3059                 .fh     = NFS_FH(inode),
3060                 .dir_fh = NFS_FH(dir),
3061                 .name   = name,
3062                 .bitmask = server->attr_bitmask,
3063         };
3064         struct nfs4_link_res res = {
3065                 .server = server,
3066         };
3067         struct rpc_message msg = {
3068                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3069                 .rpc_argp = &arg,
3070                 .rpc_resp = &res,
3071         };
3072         int status = -ENOMEM;
3073
3074         res.fattr = nfs_alloc_fattr();
3075         if (res.fattr == NULL)
3076                 goto out;
3077
3078         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3079         if (!status) {
3080                 update_changeattr(dir, &res.cinfo);
3081                 nfs_post_op_update_inode(inode, res.fattr);
3082         }
3083 out:
3084         nfs_free_fattr(res.fattr);
3085         return status;
3086 }
3087
3088 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3089 {
3090         struct nfs4_exception exception = { };
3091         int err;
3092         do {
3093                 err = nfs4_handle_exception(NFS_SERVER(inode),
3094                                 _nfs4_proc_link(inode, dir, name),
3095                                 &exception);
3096         } while (exception.retry);
3097         return err;
3098 }
3099
3100 struct nfs4_createdata {
3101         struct rpc_message msg;
3102         struct nfs4_create_arg arg;
3103         struct nfs4_create_res res;
3104         struct nfs_fh fh;
3105         struct nfs_fattr fattr;
3106 };
3107
3108 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3109                 struct qstr *name, struct iattr *sattr, u32 ftype)
3110 {
3111         struct nfs4_createdata *data;
3112
3113         data = kzalloc(sizeof(*data), GFP_KERNEL);
3114         if (data != NULL) {
3115                 struct nfs_server *server = NFS_SERVER(dir);
3116
3117                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3118                 data->msg.rpc_argp = &data->arg;
3119                 data->msg.rpc_resp = &data->res;
3120                 data->arg.dir_fh = NFS_FH(dir);
3121                 data->arg.server = server;
3122                 data->arg.name = name;
3123                 data->arg.attrs = sattr;
3124                 data->arg.ftype = ftype;
3125                 data->arg.bitmask = server->attr_bitmask;
3126                 data->res.server = server;
3127                 data->res.fh = &data->fh;
3128                 data->res.fattr = &data->fattr;
3129                 nfs_fattr_init(data->res.fattr);
3130         }
3131         return data;
3132 }
3133
3134 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3135 {
3136         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3137                                     &data->arg.seq_args, &data->res.seq_res, 1);
3138         if (status == 0) {
3139                 update_changeattr(dir, &data->res.dir_cinfo);
3140                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3141         }
3142         return status;
3143 }
3144
3145 static void nfs4_free_createdata(struct nfs4_createdata *data)
3146 {
3147         kfree(data);
3148 }
3149
3150 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3151                 struct page *page, unsigned int len, struct iattr *sattr)
3152 {
3153         struct nfs4_createdata *data;
3154         int status = -ENAMETOOLONG;
3155
3156         if (len > NFS4_MAXPATHLEN)
3157                 goto out;
3158
3159         status = -ENOMEM;
3160         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3161         if (data == NULL)
3162                 goto out;
3163
3164         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3165         data->arg.u.symlink.pages = &page;
3166         data->arg.u.symlink.len = len;
3167
3168         status = nfs4_do_create(dir, dentry, data);
3169
3170         nfs4_free_createdata(data);
3171 out:
3172         return status;
3173 }
3174
3175 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3176                 struct page *page, unsigned int len, struct iattr *sattr)
3177 {
3178         struct nfs4_exception exception = { };
3179         int err;
3180         do {
3181                 err = nfs4_handle_exception(NFS_SERVER(dir),
3182                                 _nfs4_proc_symlink(dir, dentry, page,
3183                                                         len, sattr),
3184                                 &exception);
3185         } while (exception.retry);
3186         return err;
3187 }
3188
3189 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3190                 struct iattr *sattr)
3191 {
3192         struct nfs4_createdata *data;
3193         int status = -ENOMEM;
3194
3195         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3196         if (data == NULL)
3197                 goto out;
3198
3199         status = nfs4_do_create(dir, dentry, data);
3200
3201         nfs4_free_createdata(data);
3202 out:
3203         return status;
3204 }
3205
3206 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3207                 struct iattr *sattr)
3208 {
3209         struct nfs4_exception exception = { };
3210         int err;
3211
3212         sattr->ia_mode &= ~current_umask();
3213         do {
3214                 err = nfs4_handle_exception(NFS_SERVER(dir),
3215                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3216                                 &exception);
3217         } while (exception.retry);
3218         return err;
3219 }
3220
3221 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3222                 u64 cookie, struct page **pages, unsigned int count, int plus)
3223 {
3224         struct inode            *dir = dentry->d_inode;
3225         struct nfs4_readdir_arg args = {
3226                 .fh = NFS_FH(dir),
3227                 .pages = pages,
3228                 .pgbase = 0,
3229                 .count = count,
3230                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3231                 .plus = plus,
3232         };
3233         struct nfs4_readdir_res res;
3234         struct rpc_message msg = {
3235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3236                 .rpc_argp = &args,
3237                 .rpc_resp = &res,
3238                 .rpc_cred = cred,
3239         };
3240         int                     status;
3241
3242         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3243                         dentry->d_parent->d_name.name,
3244                         dentry->d_name.name,
3245                         (unsigned long long)cookie);
3246         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3247         res.pgbase = args.pgbase;
3248         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3249         if (status >= 0) {
3250                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3251                 status += args.pgbase;
3252         }
3253
3254         nfs_invalidate_atime(dir);
3255
3256         dprintk("%s: returns %d\n", __func__, status);
3257         return status;
3258 }
3259
3260 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3261                 u64 cookie, struct page **pages, unsigned int count, int plus)
3262 {
3263         struct nfs4_exception exception = { };
3264         int err;
3265         do {
3266                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3267                                 _nfs4_proc_readdir(dentry, cred, cookie,
3268                                         pages, count, plus),
3269                                 &exception);
3270         } while (exception.retry);
3271         return err;
3272 }
3273
3274 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3275                 struct iattr *sattr, dev_t rdev)
3276 {
3277         struct nfs4_createdata *data;
3278         int mode = sattr->ia_mode;
3279         int status = -ENOMEM;
3280
3281         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3282         if (data == NULL)
3283                 goto out;
3284
3285         if (S_ISFIFO(mode))
3286                 data->arg.ftype = NF4FIFO;
3287         else if (S_ISBLK(mode)) {
3288                 data->arg.ftype = NF4BLK;
3289                 data->arg.u.device.specdata1 = MAJOR(rdev);
3290                 data->arg.u.device.specdata2 = MINOR(rdev);
3291         }
3292         else if (S_ISCHR(mode)) {
3293                 data->arg.ftype = NF4CHR;
3294                 data->arg.u.device.specdata1 = MAJOR(rdev);
3295                 data->arg.u.device.specdata2 = MINOR(rdev);
3296         } else if (!S_ISSOCK(mode)) {
3297                 status = -EINVAL;
3298                 goto out_free;
3299         }
3300
3301         status = nfs4_do_create(dir, dentry, data);
3302 out_free:
3303         nfs4_free_createdata(data);
3304 out:
3305         return status;
3306 }
3307
3308 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3309                 struct iattr *sattr, dev_t rdev)
3310 {
3311         struct nfs4_exception exception = { };
3312         int err;
3313
3314         sattr->ia_mode &= ~current_umask();
3315         do {
3316                 err = nfs4_handle_exception(NFS_SERVER(dir),
3317                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3318                                 &exception);
3319         } while (exception.retry);
3320         return err;
3321 }
3322
3323 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3324                  struct nfs_fsstat *fsstat)
3325 {
3326         struct nfs4_statfs_arg args = {
3327                 .fh = fhandle,
3328                 .bitmask = server->attr_bitmask,
3329         };
3330         struct nfs4_statfs_res res = {
3331                 .fsstat = fsstat,
3332         };
3333         struct rpc_message msg = {
3334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3335                 .rpc_argp = &args,
3336                 .rpc_resp = &res,
3337         };
3338
3339         nfs_fattr_init(fsstat->fattr);
3340         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3341 }
3342
3343 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3344 {
3345         struct nfs4_exception exception = { };
3346         int err;
3347         do {
3348                 err = nfs4_handle_exception(server,
3349                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3350                                 &exception);
3351         } while (exception.retry);
3352         return err;
3353 }
3354
3355 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3356                 struct nfs_fsinfo *fsinfo)
3357 {
3358         struct nfs4_fsinfo_arg args = {
3359                 .fh = fhandle,
3360                 .bitmask = server->attr_bitmask,
3361         };
3362         struct nfs4_fsinfo_res res = {
3363                 .fsinfo = fsinfo,
3364         };
3365         struct rpc_message msg = {
3366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3367                 .rpc_argp = &args,
3368                 .rpc_resp = &res,
3369         };
3370
3371         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3372 }
3373
3374 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3375 {
3376         struct nfs4_exception exception = { };
3377         int err;
3378
3379         do {
3380                 err = nfs4_handle_exception(server,
3381                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3382                                 &exception);
3383         } while (exception.retry);
3384         return err;
3385 }
3386
3387 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3388 {
3389         int error;
3390
3391         nfs_fattr_init(fsinfo->fattr);
3392         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3393         if (error == 0) {
3394                 /* block layout checks this! */
3395                 server->pnfs_blksize = fsinfo->blksize;
3396                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3397         }
3398
3399         return error;
3400 }
3401
3402 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3403                 struct nfs_pathconf *pathconf)
3404 {
3405         struct nfs4_pathconf_arg args = {
3406                 .fh = fhandle,
3407                 .bitmask = server->attr_bitmask,
3408         };
3409         struct nfs4_pathconf_res res = {
3410                 .pathconf = pathconf,
3411         };
3412         struct rpc_message msg = {
3413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3414                 .rpc_argp = &args,
3415                 .rpc_resp = &res,
3416         };
3417
3418         /* None of the pathconf attributes are mandatory to implement */
3419         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3420                 memset(pathconf, 0, sizeof(*pathconf));
3421                 return 0;
3422         }
3423
3424         nfs_fattr_init(pathconf->fattr);
3425         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3426 }
3427
3428 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3429                 struct nfs_pathconf *pathconf)
3430 {
3431         struct nfs4_exception exception = { };
3432         int err;
3433
3434         do {
3435                 err = nfs4_handle_exception(server,
3436                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3437                                 &exception);
3438         } while (exception.retry);
3439         return err;
3440 }
3441
3442 void __nfs4_read_done_cb(struct nfs_read_data *data)
3443 {
3444         nfs_invalidate_atime(data->header->inode);
3445 }
3446
3447 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3448 {
3449         struct nfs_server *server = NFS_SERVER(data->header->inode);
3450
3451         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3452                 rpc_restart_call_prepare(task);
3453                 return -EAGAIN;
3454         }
3455
3456         __nfs4_read_done_cb(data);
3457         if (task->tk_status > 0)
3458                 renew_lease(server, data->timestamp);
3459         return 0;
3460 }
3461
3462 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3463 {
3464
3465         dprintk("--> %s\n", __func__);
3466
3467         if (!nfs4_sequence_done(task, &data->res.seq_res))
3468                 return -EAGAIN;
3469
3470         return data->read_done_cb ? data->read_done_cb(task, data) :
3471                                     nfs4_read_done_cb(task, data);
3472 }
3473
3474 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3475 {
3476         data->timestamp   = jiffies;
3477         data->read_done_cb = nfs4_read_done_cb;
3478         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3479         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3480 }
3481
3482 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3483 {
3484         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3485                         &data->args.seq_args,
3486                         &data->res.seq_res,
3487                         task);
3488 }
3489
3490 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3491 {
3492         struct inode *inode = data->header->inode;
3493
3494         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3495                 rpc_restart_call_prepare(task);
3496                 return -EAGAIN;
3497         }
3498         if (task->tk_status >= 0) {
3499                 renew_lease(NFS_SERVER(inode), data->timestamp);
3500                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3501         }
3502         return 0;
3503 }
3504
3505 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3506 {
3507         if (!nfs4_sequence_done(task, &data->res.seq_res))
3508                 return -EAGAIN;
3509         return data->write_done_cb ? data->write_done_cb(task, data) :
3510                 nfs4_write_done_cb(task, data);
3511 }
3512
3513 static
3514 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3515 {
3516         const struct nfs_pgio_header *hdr = data->header;
3517
3518         /* Don't request attributes for pNFS or O_DIRECT writes */
3519         if (data->ds_clp != NULL || hdr->dreq != NULL)
3520                 return false;
3521         /* Otherwise, request attributes if and only if we don't hold
3522          * a delegation
3523          */
3524         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3525 }
3526
3527 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3528 {
3529         struct nfs_server *server = NFS_SERVER(data->header->inode);
3530
3531         if (!nfs4_write_need_cache_consistency_data(data)) {
3532                 data->args.bitmask = NULL;
3533                 data->res.fattr = NULL;
3534         } else
3535                 data->args.bitmask = server->cache_consistency_bitmask;
3536
3537         if (!data->write_done_cb)
3538                 data->write_done_cb = nfs4_write_done_cb;
3539         data->res.server = server;
3540         data->timestamp   = jiffies;
3541
3542         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3543         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3544 }
3545
3546 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3547 {
3548         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3549                         &data->args.seq_args,
3550                         &data->res.seq_res,
3551                         task);
3552 }
3553
3554 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3555 {
3556         nfs4_setup_sequence(NFS_SERVER(data->inode),
3557                         &data->args.seq_args,
3558                         &data->res.seq_res,
3559                         task);
3560 }
3561
3562 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3563 {
3564         struct inode *inode = data->inode;
3565
3566         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3567                 rpc_restart_call_prepare(task);
3568                 return -EAGAIN;
3569         }
3570         return 0;
3571 }
3572
3573 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3574 {
3575         if (!nfs4_sequence_done(task, &data->res.seq_res))
3576                 return -EAGAIN;
3577         return data->commit_done_cb(task, data);
3578 }
3579
3580 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3581 {
3582         struct nfs_server *server = NFS_SERVER(data->inode);
3583
3584         if (data->commit_done_cb == NULL)
3585                 data->commit_done_cb = nfs4_commit_done_cb;
3586         data->res.server = server;
3587         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3588         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3589 }
3590
3591 struct nfs4_renewdata {
3592         struct nfs_client       *client;
3593         unsigned long           timestamp;
3594 };
3595
3596 /*
3597  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3598  * standalone procedure for queueing an asynchronous RENEW.
3599  */
3600 static void nfs4_renew_release(void *calldata)
3601 {
3602         struct nfs4_renewdata *data = calldata;
3603         struct nfs_client *clp = data->client;
3604
3605         if (atomic_read(&clp->cl_count) > 1)
3606                 nfs4_schedule_state_renewal(clp);
3607         nfs_put_client(clp);
3608         kfree(data);
3609 }
3610
3611 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3612 {
3613         struct nfs4_renewdata *data = calldata;
3614         struct nfs_client *clp = data->client;
3615         unsigned long timestamp = data->timestamp;
3616
3617         if (task->tk_status < 0) {
3618                 /* Unless we're shutting down, schedule state recovery! */
3619                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3620                         return;
3621                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3622                         nfs4_schedule_lease_recovery(clp);
3623                         return;
3624                 }
3625                 nfs4_schedule_path_down_recovery(clp);
3626         }
3627         do_renew_lease(clp, timestamp);
3628 }
3629
3630 static const struct rpc_call_ops nfs4_renew_ops = {
3631         .rpc_call_done = nfs4_renew_done,
3632         .rpc_release = nfs4_renew_release,
3633 };
3634
3635 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3636 {
3637         struct rpc_message msg = {
3638                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3639                 .rpc_argp       = clp,
3640                 .rpc_cred       = cred,
3641         };
3642         struct nfs4_renewdata *data;
3643
3644         if (renew_flags == 0)
3645                 return 0;
3646         if (!atomic_inc_not_zero(&clp->cl_count))
3647                 return -EIO;
3648         data = kmalloc(sizeof(*data), GFP_NOFS);
3649         if (data == NULL)
3650                 return -ENOMEM;
3651         data->client = clp;
3652         data->timestamp = jiffies;
3653         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3654                         &nfs4_renew_ops, data);
3655 }
3656
3657 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3658 {
3659         struct rpc_message msg = {
3660                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3661                 .rpc_argp       = clp,
3662                 .rpc_cred       = cred,
3663         };
3664         unsigned long now = jiffies;
3665         int status;
3666
3667         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3668         if (status < 0)
3669                 return status;
3670         do_renew_lease(clp, now);
3671         return 0;
3672 }
3673
3674 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3675 {
3676         return (server->caps & NFS_CAP_ACLS)
3677                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3678                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3679 }
3680
3681 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3682  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3683  * the stack.
3684  */
3685 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3686
3687 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3688                 struct page **pages, unsigned int *pgbase)
3689 {
3690         struct page *newpage, **spages;
3691         int rc = 0;
3692         size_t len;
3693         spages = pages;
3694
3695         do {
3696                 len = min_t(size_t, PAGE_SIZE, buflen);
3697                 newpage = alloc_page(GFP_KERNEL);
3698
3699                 if (newpage == NULL)
3700                         goto unwind;
3701                 memcpy(page_address(newpage), buf, len);
3702                 buf += len;
3703                 buflen -= len;
3704                 *pages++ = newpage;
3705                 rc++;
3706         } while (buflen != 0);
3707
3708         return rc;
3709
3710 unwind:
3711         for(; rc > 0; rc--)
3712                 __free_page(spages[rc-1]);
3713         return -ENOMEM;
3714 }
3715
3716 struct nfs4_cached_acl {
3717         int cached;
3718         size_t len;
3719         char data[0];
3720 };
3721
3722 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3723 {
3724         struct nfs_inode *nfsi = NFS_I(inode);
3725
3726         spin_lock(&inode->i_lock);
3727         kfree(nfsi->nfs4_acl);
3728         nfsi->nfs4_acl = acl;
3729         spin_unlock(&inode->i_lock);
3730 }
3731
3732 static void nfs4_zap_acl_attr(struct inode *inode)
3733 {
3734         nfs4_set_cached_acl(inode, NULL);
3735 }
3736
3737 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3738 {
3739         struct nfs_inode *nfsi = NFS_I(inode);
3740         struct nfs4_cached_acl *acl;
3741         int ret = -ENOENT;
3742
3743         spin_lock(&inode->i_lock);
3744         acl = nfsi->nfs4_acl;
3745         if (acl == NULL)
3746                 goto out;
3747         if (buf == NULL) /* user is just asking for length */
3748                 goto out_len;
3749         if (acl->cached == 0)
3750                 goto out;
3751         ret = -ERANGE; /* see getxattr(2) man page */
3752         if (acl->len > buflen)
3753                 goto out;
3754         memcpy(buf, acl->data, acl->len);
3755 out_len:
3756         ret = acl->len;
3757 out:
3758         spin_unlock(&inode->i_lock);
3759         return ret;
3760 }
3761
3762 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3763 {
3764         struct nfs4_cached_acl *acl;
3765         size_t buflen = sizeof(*acl) + acl_len;
3766
3767         if (buflen <= PAGE_SIZE) {
3768                 acl = kmalloc(buflen, GFP_KERNEL);
3769                 if (acl == NULL)
3770                         goto out;
3771                 acl->cached = 1;
3772                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3773         } else {
3774                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3775                 if (acl == NULL)
3776                         goto out;
3777                 acl->cached = 0;
3778         }
3779         acl->len = acl_len;
3780 out:
3781         nfs4_set_cached_acl(inode, acl);
3782 }
3783
3784 /*
3785  * The getxattr API returns the required buffer length when called with a
3786  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3787  * the required buf.  On a NULL buf, we send a page of data to the server
3788  * guessing that the ACL request can be serviced by a page. If so, we cache
3789  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3790  * the cache. If not so, we throw away the page, and cache the required
3791  * length. The next getxattr call will then produce another round trip to
3792  * the server, this time with the input buf of the required size.
3793  */
3794 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3795 {
3796         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3797         struct nfs_getaclargs args = {
3798                 .fh = NFS_FH(inode),
3799                 .acl_pages = pages,
3800                 .acl_len = buflen,
3801         };
3802         struct nfs_getaclres res = {
3803                 .acl_len = buflen,
3804         };
3805         struct rpc_message msg = {
3806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3807                 .rpc_argp = &args,
3808                 .rpc_resp = &res,
3809         };
3810         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3811         int ret = -ENOMEM, i;
3812
3813         /* As long as we're doing a round trip to the server anyway,
3814          * let's be prepared for a page of acl data. */
3815         if (npages == 0)
3816                 npages = 1;
3817         if (npages > ARRAY_SIZE(pages))
3818                 return -ERANGE;
3819
3820         for (i = 0; i < npages; i++) {
3821                 pages[i] = alloc_page(GFP_KERNEL);
3822                 if (!pages[i])
3823                         goto out_free;
3824         }
3825
3826         /* for decoding across pages */
3827         res.acl_scratch = alloc_page(GFP_KERNEL);
3828         if (!res.acl_scratch)
3829                 goto out_free;
3830
3831         args.acl_len = npages * PAGE_SIZE;
3832         args.acl_pgbase = 0;
3833
3834         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3835                 __func__, buf, buflen, npages, args.acl_len);
3836         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3837                              &msg, &args.seq_args, &res.seq_res, 0);
3838         if (ret)
3839                 goto out_free;
3840
3841         /* Handle the case where the passed-in buffer is too short */
3842         if (res.acl_flags & NFS4_ACL_TRUNC) {
3843                 /* Did the user only issue a request for the acl length? */
3844                 if (buf == NULL)
3845                         goto out_ok;
3846                 ret = -ERANGE;
3847                 goto out_free;
3848         }
3849         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3850         if (buf) {
3851                 if (res.acl_len > buflen) {
3852                         ret = -ERANGE;
3853                         goto out_free;
3854                 }
3855                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3856         }
3857 out_ok:
3858         ret = res.acl_len;
3859 out_free:
3860         for (i = 0; i < npages; i++)
3861                 if (pages[i])
3862                         __free_page(pages[i]);
3863         if (res.acl_scratch)
3864                 __free_page(res.acl_scratch);
3865         return ret;
3866 }
3867
3868 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3869 {
3870         struct nfs4_exception exception = { };
3871         ssize_t ret;
3872         do {
3873                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3874                 if (ret >= 0)
3875                         break;
3876                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3877         } while (exception.retry);
3878         return ret;
3879 }
3880
3881 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3882 {
3883         struct nfs_server *server = NFS_SERVER(inode);
3884         int ret;
3885
3886         if (!nfs4_server_supports_acls(server))
3887                 return -EOPNOTSUPP;
3888         ret = nfs_revalidate_inode(server, inode);
3889         if (ret < 0)
3890                 return ret;
3891         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3892                 nfs_zap_acl_cache(inode);
3893         ret = nfs4_read_cached_acl(inode, buf, buflen);
3894         if (ret != -ENOENT)
3895                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3896                  * but no cached acl data, just the acl length */
3897                 return ret;
3898         return nfs4_get_acl_uncached(inode, buf, buflen);
3899 }
3900
3901 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3902 {
3903         struct nfs_server *server = NFS_SERVER(inode);
3904         struct page *pages[NFS4ACL_MAXPAGES];
3905         struct nfs_setaclargs arg = {
3906                 .fh             = NFS_FH(inode),
3907                 .acl_pages      = pages,
3908                 .acl_len        = buflen,
3909         };
3910         struct nfs_setaclres res;
3911         struct rpc_message msg = {
3912                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3913                 .rpc_argp       = &arg,
3914                 .rpc_resp       = &res,
3915         };
3916         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3917         int ret, i;
3918
3919         if (!nfs4_server_supports_acls(server))
3920                 return -EOPNOTSUPP;
3921         if (npages > ARRAY_SIZE(pages))
3922                 return -ERANGE;
3923         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3924         if (i < 0)
3925                 return i;
3926         nfs4_inode_return_delegation(inode);
3927         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3928
3929         /*
3930          * Free each page after tx, so the only ref left is
3931          * held by the network stack
3932          */
3933         for (; i > 0; i--)
3934                 put_page(pages[i-1]);
3935
3936         /*
3937          * Acl update can result in inode attribute update.
3938          * so mark the attribute cache invalid.
3939          */
3940         spin_lock(&inode->i_lock);
3941         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3942         spin_unlock(&inode->i_lock);
3943         nfs_access_zap_cache(inode);
3944         nfs_zap_acl_cache(inode);
3945         return ret;
3946 }
3947
3948 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3949 {
3950         struct nfs4_exception exception = { };
3951         int err;
3952         do {
3953                 err = nfs4_handle_exception(NFS_SERVER(inode),
3954                                 __nfs4_proc_set_acl(inode, buf, buflen),
3955                                 &exception);
3956         } while (exception.retry);
3957         return err;
3958 }
3959
3960 static int
3961 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3962 {
3963         struct nfs_client *clp = server->nfs_client;
3964
3965         if (task->tk_status >= 0)
3966                 return 0;
3967         switch(task->tk_status) {
3968                 case -NFS4ERR_DELEG_REVOKED:
3969                 case -NFS4ERR_ADMIN_REVOKED:
3970                 case -NFS4ERR_BAD_STATEID:
3971                         if (state == NULL)
3972                                 break;
3973                         nfs_remove_bad_delegation(state->inode);
3974                 case -NFS4ERR_OPENMODE:
3975                         if (state == NULL)
3976                                 break;
3977                         nfs4_schedule_stateid_recovery(server, state);
3978                         goto wait_on_recovery;
3979                 case -NFS4ERR_EXPIRED:
3980                         if (state != NULL)
3981                                 nfs4_schedule_stateid_recovery(server, state);
3982                 case -NFS4ERR_STALE_STATEID:
3983                 case -NFS4ERR_STALE_CLIENTID:
3984                         nfs4_schedule_lease_recovery(clp);
3985                         goto wait_on_recovery;
3986 #if defined(CONFIG_NFS_V4_1)
3987                 case -NFS4ERR_BADSESSION:
3988                 case -NFS4ERR_BADSLOT:
3989                 case -NFS4ERR_BAD_HIGH_SLOT:
3990                 case -NFS4ERR_DEADSESSION:
3991                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3992                 case -NFS4ERR_SEQ_FALSE_RETRY:
3993                 case -NFS4ERR_SEQ_MISORDERED:
3994                         dprintk("%s ERROR %d, Reset session\n", __func__,
3995                                 task->tk_status);
3996                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3997                         task->tk_status = 0;
3998                         return -EAGAIN;
3999 #endif /* CONFIG_NFS_V4_1 */
4000                 case -NFS4ERR_DELAY:
4001                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4002                 case -NFS4ERR_GRACE:
4003                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4004                         task->tk_status = 0;
4005                         return -EAGAIN;
4006                 case -NFS4ERR_RETRY_UNCACHED_REP:
4007                 case -NFS4ERR_OLD_STATEID:
4008                         task->tk_status = 0;
4009                         return -EAGAIN;
4010         }
4011         task->tk_status = nfs4_map_errors(task->tk_status);
4012         return 0;
4013 wait_on_recovery:
4014         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4015         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4016                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4017         task->tk_status = 0;
4018         return -EAGAIN;
4019 }
4020
4021 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4022                                     nfs4_verifier *bootverf)
4023 {
4024         __be32 verf[2];
4025
4026         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4027                 /* An impossible timestamp guarantees this value
4028                  * will never match a generated boot time. */
4029                 verf[0] = 0;
4030                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4031         } else {
4032                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4033                 verf[0] = (__be32)nn->boot_time.tv_sec;
4034                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4035         }
4036         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4037 }
4038
4039 static unsigned int
4040 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4041                                    char *buf, size_t len)
4042 {
4043         unsigned int result;
4044
4045         rcu_read_lock();
4046         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4047                                 clp->cl_ipaddr,
4048                                 rpc_peeraddr2str(clp->cl_rpcclient,
4049                                                         RPC_DISPLAY_ADDR),
4050                                 rpc_peeraddr2str(clp->cl_rpcclient,
4051                                                         RPC_DISPLAY_PROTO));
4052         rcu_read_unlock();
4053         return result;
4054 }
4055
4056 static unsigned int
4057 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4058                                 char *buf, size_t len)
4059 {
4060         char *nodename = clp->cl_rpcclient->cl_nodename;
4061
4062         if (nfs4_client_id_uniquifier[0] != '\0')
4063                 nodename = nfs4_client_id_uniquifier;
4064         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4065                                 clp->rpc_ops->version, clp->cl_minorversion,
4066                                 nodename);
4067 }
4068
4069 /**
4070  * nfs4_proc_setclientid - Negotiate client ID
4071  * @clp: state data structure
4072  * @program: RPC program for NFSv4 callback service
4073  * @port: IP port number for NFS4 callback service
4074  * @cred: RPC credential to use for this call
4075  * @res: where to place the result
4076  *
4077  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4078  */
4079 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4080                 unsigned short port, struct rpc_cred *cred,
4081                 struct nfs4_setclientid_res *res)
4082 {
4083         nfs4_verifier sc_verifier;
4084         struct nfs4_setclientid setclientid = {
4085                 .sc_verifier = &sc_verifier,
4086                 .sc_prog = program,
4087                 .sc_cb_ident = clp->cl_cb_ident,
4088         };
4089         struct rpc_message msg = {
4090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4091                 .rpc_argp = &setclientid,
4092                 .rpc_resp = res,
4093                 .rpc_cred = cred,
4094         };
4095         int status;
4096
4097         /* nfs_client_id4 */
4098         nfs4_init_boot_verifier(clp, &sc_verifier);
4099         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4100                 setclientid.sc_name_len =
4101                                 nfs4_init_uniform_client_string(clp,
4102                                                 setclientid.sc_name,
4103                                                 sizeof(setclientid.sc_name));
4104         else
4105                 setclientid.sc_name_len =
4106                                 nfs4_init_nonuniform_client_string(clp,
4107                                                 setclientid.sc_name,
4108                                                 sizeof(setclientid.sc_name));
4109         /* cb_client4 */
4110         rcu_read_lock();
4111         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4112                                 sizeof(setclientid.sc_netid),
4113                                 rpc_peeraddr2str(clp->cl_rpcclient,
4114                                                         RPC_DISPLAY_NETID));
4115         rcu_read_unlock();
4116         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4117                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4118                                 clp->cl_ipaddr, port >> 8, port & 255);
4119
4120         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4121                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4122                 setclientid.sc_name_len, setclientid.sc_name);
4123         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4124         dprintk("NFS reply setclientid: %d\n", status);
4125         return status;
4126 }
4127
4128 /**
4129  * nfs4_proc_setclientid_confirm - Confirm client ID
4130  * @clp: state data structure
4131  * @res: result of a previous SETCLIENTID
4132  * @cred: RPC credential to use for this call
4133  *
4134  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4135  */
4136 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4137                 struct nfs4_setclientid_res *arg,
4138                 struct rpc_cred *cred)
4139 {
4140         struct nfs_fsinfo fsinfo;
4141         struct rpc_message msg = {
4142                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4143                 .rpc_argp = arg,
4144                 .rpc_resp = &fsinfo,
4145                 .rpc_cred = cred,
4146         };
4147         unsigned long now;
4148         int status;
4149
4150         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4151                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4152                 clp->cl_clientid);
4153         now = jiffies;
4154         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4155         if (status == 0) {
4156                 spin_lock(&clp->cl_lock);
4157                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4158                 clp->cl_last_renewal = now;
4159                 spin_unlock(&clp->cl_lock);
4160         }
4161         dprintk("NFS reply setclientid_confirm: %d\n", status);
4162         return status;
4163 }
4164
4165 struct nfs4_delegreturndata {
4166         struct nfs4_delegreturnargs args;
4167         struct nfs4_delegreturnres res;
4168         struct nfs_fh fh;
4169         nfs4_stateid stateid;
4170         unsigned long timestamp;
4171         struct nfs_fattr fattr;
4172         int rpc_status;
4173 };
4174
4175 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4176 {
4177         struct nfs4_delegreturndata *data = calldata;
4178
4179         if (!nfs4_sequence_done(task, &data->res.seq_res))
4180                 return;
4181
4182         switch (task->tk_status) {
4183         case -NFS4ERR_STALE_STATEID:
4184         case -NFS4ERR_EXPIRED:
4185         case 0:
4186                 renew_lease(data->res.server, data->timestamp);
4187                 break;
4188         default:
4189                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4190                                 -EAGAIN) {
4191                         rpc_restart_call_prepare(task);
4192                         return;
4193                 }
4194         }
4195         data->rpc_status = task->tk_status;
4196 }
4197
4198 static void nfs4_delegreturn_release(void *calldata)
4199 {
4200         kfree(calldata);
4201 }
4202
4203 #if defined(CONFIG_NFS_V4_1)
4204 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4205 {
4206         struct nfs4_delegreturndata *d_data;
4207
4208         d_data = (struct nfs4_delegreturndata *)data;
4209
4210         nfs4_setup_sequence(d_data->res.server,
4211                         &d_data->args.seq_args,
4212                         &d_data->res.seq_res,
4213                         task);
4214 }
4215 #endif /* CONFIG_NFS_V4_1 */
4216
4217 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4218 #if defined(CONFIG_NFS_V4_1)
4219         .rpc_call_prepare = nfs4_delegreturn_prepare,
4220 #endif /* CONFIG_NFS_V4_1 */
4221         .rpc_call_done = nfs4_delegreturn_done,
4222         .rpc_release = nfs4_delegreturn_release,
4223 };
4224
4225 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4226 {
4227         struct nfs4_delegreturndata *data;
4228         struct nfs_server *server = NFS_SERVER(inode);
4229         struct rpc_task *task;
4230         struct rpc_message msg = {
4231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4232                 .rpc_cred = cred,
4233         };
4234         struct rpc_task_setup task_setup_data = {
4235                 .rpc_client = server->client,
4236                 .rpc_message = &msg,
4237                 .callback_ops = &nfs4_delegreturn_ops,
4238                 .flags = RPC_TASK_ASYNC,
4239         };
4240         int status = 0;
4241
4242         data = kzalloc(sizeof(*data), GFP_NOFS);
4243         if (data == NULL)
4244                 return -ENOMEM;
4245         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4246         data->args.fhandle = &data->fh;
4247         data->args.stateid = &data->stateid;
4248         data->args.bitmask = server->cache_consistency_bitmask;
4249         nfs_copy_fh(&data->fh, NFS_FH(inode));
4250         nfs4_stateid_copy(&data->stateid, stateid);
4251         data->res.fattr = &data->fattr;
4252         data->res.server = server;
4253         nfs_fattr_init(data->res.fattr);
4254         data->timestamp = jiffies;
4255         data->rpc_status = 0;
4256
4257         task_setup_data.callback_data = data;
4258         msg.rpc_argp = &data->args;
4259         msg.rpc_resp = &data->res;
4260         task = rpc_run_task(&task_setup_data);
4261         if (IS_ERR(task))
4262                 return PTR_ERR(task);
4263         if (!issync)
4264                 goto out;
4265         status = nfs4_wait_for_completion_rpc_task(task);
4266         if (status != 0)
4267                 goto out;
4268         status = data->rpc_status;
4269         if (status == 0)
4270                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4271         else
4272                 nfs_refresh_inode(inode, &data->fattr);
4273 out:
4274         rpc_put_task(task);
4275         return status;
4276 }
4277
4278 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4279 {
4280         struct nfs_server *server = NFS_SERVER(inode);
4281         struct nfs4_exception exception = { };
4282         int err;
4283         do {
4284                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4285                 switch (err) {
4286                         case -NFS4ERR_STALE_STATEID:
4287                         case -NFS4ERR_EXPIRED:
4288                         case 0:
4289                                 return 0;
4290                 }
4291                 err = nfs4_handle_exception(server, err, &exception);
4292         } while (exception.retry);
4293         return err;
4294 }
4295
4296 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4297 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4298
4299 /*
4300  * sleep, with exponential backoff, and retry the LOCK operation.
4301  */
4302 static unsigned long
4303 nfs4_set_lock_task_retry(unsigned long timeout)
4304 {
4305         freezable_schedule_timeout_killable(timeout);
4306         timeout <<= 1;
4307         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4308                 return NFS4_LOCK_MAXTIMEOUT;
4309         return timeout;
4310 }
4311
4312 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4313 {
4314         struct inode *inode = state->inode;
4315         struct nfs_server *server = NFS_SERVER(inode);
4316         struct nfs_client *clp = server->nfs_client;
4317         struct nfs_lockt_args arg = {
4318                 .fh = NFS_FH(inode),
4319                 .fl = request,
4320         };
4321         struct nfs_lockt_res res = {
4322                 .denied = request,
4323         };
4324         struct rpc_message msg = {
4325                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4326                 .rpc_argp       = &arg,
4327                 .rpc_resp       = &res,
4328                 .rpc_cred       = state->owner->so_cred,
4329         };
4330         struct nfs4_lock_state *lsp;
4331         int status;
4332
4333         arg.lock_owner.clientid = clp->cl_clientid;
4334         status = nfs4_set_lock_state(state, request);
4335         if (status != 0)
4336                 goto out;
4337         lsp = request->fl_u.nfs4_fl.owner;
4338         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4339         arg.lock_owner.s_dev = server->s_dev;
4340         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4341         switch (status) {
4342                 case 0:
4343                         request->fl_type = F_UNLCK;
4344                         break;
4345                 case -NFS4ERR_DENIED:
4346                         status = 0;
4347         }
4348         request->fl_ops->fl_release_private(request);
4349 out:
4350         return status;
4351 }
4352
4353 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4354 {
4355         struct nfs4_exception exception = { };
4356         int err;
4357
4358         do {
4359                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4360                                 _nfs4_proc_getlk(state, cmd, request),
4361                                 &exception);
4362         } while (exception.retry);
4363         return err;
4364 }
4365
4366 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4367 {
4368         int res = 0;
4369         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4370                 case FL_POSIX:
4371                         res = posix_lock_file_wait(file, fl);
4372                         break;
4373                 case FL_FLOCK:
4374                         res = flock_lock_file_wait(file, fl);
4375                         break;
4376                 default:
4377                         BUG();
4378         }
4379         return res;
4380 }
4381
4382 struct nfs4_unlockdata {
4383         struct nfs_locku_args arg;
4384         struct nfs_locku_res res;
4385         struct nfs4_lock_state *lsp;
4386         struct nfs_open_context *ctx;
4387         struct file_lock fl;
4388         const struct nfs_server *server;
4389         unsigned long timestamp;
4390 };
4391
4392 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4393                 struct nfs_open_context *ctx,
4394                 struct nfs4_lock_state *lsp,
4395                 struct nfs_seqid *seqid)
4396 {
4397         struct nfs4_unlockdata *p;
4398         struct inode *inode = lsp->ls_state->inode;
4399
4400         p = kzalloc(sizeof(*p), GFP_NOFS);
4401         if (p == NULL)
4402                 return NULL;
4403         p->arg.fh = NFS_FH(inode);
4404         p->arg.fl = &p->fl;
4405         p->arg.seqid = seqid;
4406         p->res.seqid = seqid;
4407         p->arg.stateid = &lsp->ls_stateid;
4408         p->lsp = lsp;
4409         atomic_inc(&lsp->ls_count);
4410         /* Ensure we don't close file until we're done freeing locks! */
4411         p->ctx = get_nfs_open_context(ctx);
4412         memcpy(&p->fl, fl, sizeof(p->fl));
4413         p->server = NFS_SERVER(inode);
4414         return p;
4415 }
4416
4417 static void nfs4_locku_release_calldata(void *data)
4418 {
4419         struct nfs4_unlockdata *calldata = data;
4420         nfs_free_seqid(calldata->arg.seqid);
4421         nfs4_put_lock_state(calldata->lsp);
4422         put_nfs_open_context(calldata->ctx);
4423         kfree(calldata);
4424 }
4425
4426 static void nfs4_locku_done(struct rpc_task *task, void *data)
4427 {
4428         struct nfs4_unlockdata *calldata = data;
4429
4430         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4431                 return;
4432         switch (task->tk_status) {
4433                 case 0:
4434                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4435                                         &calldata->res.stateid);
4436                         renew_lease(calldata->server, calldata->timestamp);
4437                         break;
4438                 case -NFS4ERR_BAD_STATEID:
4439                 case -NFS4ERR_OLD_STATEID:
4440                 case -NFS4ERR_STALE_STATEID:
4441                 case -NFS4ERR_EXPIRED:
4442                         break;
4443                 default:
4444                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4445                                 rpc_restart_call_prepare(task);
4446         }
4447         nfs_release_seqid(calldata->arg.seqid);
4448 }
4449
4450 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4451 {
4452         struct nfs4_unlockdata *calldata = data;
4453
4454         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4455                 return;
4456         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4457                 /* Note: exit _without_ running nfs4_locku_done */
4458                 task->tk_action = NULL;
4459                 nfs4_sequence_done(task, &calldata->res.seq_res);
4460                 return;
4461         }
4462         calldata->timestamp = jiffies;
4463         if (nfs4_setup_sequence(calldata->server,
4464                                 &calldata->arg.seq_args,
4465                                 &calldata->res.seq_res,
4466                                 task) != 0)
4467                 nfs_release_seqid(calldata->arg.seqid);
4468 }
4469
4470 static const struct rpc_call_ops nfs4_locku_ops = {
4471         .rpc_call_prepare = nfs4_locku_prepare,
4472         .rpc_call_done = nfs4_locku_done,
4473         .rpc_release = nfs4_locku_release_calldata,
4474 };
4475
4476 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4477                 struct nfs_open_context *ctx,
4478                 struct nfs4_lock_state *lsp,
4479                 struct nfs_seqid *seqid)
4480 {
4481         struct nfs4_unlockdata *data;
4482         struct rpc_message msg = {
4483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4484                 .rpc_cred = ctx->cred,
4485         };
4486         struct rpc_task_setup task_setup_data = {
4487                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4488                 .rpc_message = &msg,
4489                 .callback_ops = &nfs4_locku_ops,
4490                 .workqueue = nfsiod_workqueue,
4491                 .flags = RPC_TASK_ASYNC,
4492         };
4493
4494         /* Ensure this is an unlock - when canceling a lock, the
4495          * canceled lock is passed in, and it won't be an unlock.
4496          */
4497         fl->fl_type = F_UNLCK;
4498
4499         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4500         if (data == NULL) {
4501                 nfs_free_seqid(seqid);
4502                 return ERR_PTR(-ENOMEM);
4503         }
4504
4505         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4506         msg.rpc_argp = &data->arg;
4507         msg.rpc_resp = &data->res;
4508         task_setup_data.callback_data = data;
4509         return rpc_run_task(&task_setup_data);
4510 }
4511
4512 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4513 {
4514         struct inode *inode = state->inode;
4515         struct nfs4_state_owner *sp = state->owner;
4516         struct nfs_inode *nfsi = NFS_I(inode);
4517         struct nfs_seqid *seqid;
4518         struct nfs4_lock_state *lsp;
4519         struct rpc_task *task;
4520         int status = 0;
4521         unsigned char fl_flags = request->fl_flags;
4522
4523         status = nfs4_set_lock_state(state, request);
4524         /* Unlock _before_ we do the RPC call */
4525         request->fl_flags |= FL_EXISTS;
4526         /* Exclude nfs_delegation_claim_locks() */
4527         mutex_lock(&sp->so_delegreturn_mutex);
4528         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4529         down_read(&nfsi->rwsem);
4530         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4531                 up_read(&nfsi->rwsem);
4532                 mutex_unlock(&sp->so_delegreturn_mutex);
4533                 goto out;
4534         }
4535         up_read(&nfsi->rwsem);
4536         mutex_unlock(&sp->so_delegreturn_mutex);
4537         if (status != 0)
4538                 goto out;
4539         /* Is this a delegated lock? */
4540         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4541                 goto out;
4542         lsp = request->fl_u.nfs4_fl.owner;
4543         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4544         status = -ENOMEM;
4545         if (seqid == NULL)
4546                 goto out;
4547         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4548         status = PTR_ERR(task);
4549         if (IS_ERR(task))
4550                 goto out;
4551         status = nfs4_wait_for_completion_rpc_task(task);
4552         rpc_put_task(task);
4553 out:
4554         request->fl_flags = fl_flags;
4555         return status;
4556 }
4557
4558 struct nfs4_lockdata {
4559         struct nfs_lock_args arg;
4560         struct nfs_lock_res res;
4561         struct nfs4_lock_state *lsp;
4562         struct nfs_open_context *ctx;
4563         struct file_lock fl;
4564         unsigned long timestamp;
4565         int rpc_status;
4566         int cancelled;
4567         struct nfs_server *server;
4568 };
4569
4570 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4571                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4572                 gfp_t gfp_mask)
4573 {
4574         struct nfs4_lockdata *p;
4575         struct inode *inode = lsp->ls_state->inode;
4576         struct nfs_server *server = NFS_SERVER(inode);
4577
4578         p = kzalloc(sizeof(*p), gfp_mask);
4579         if (p == NULL)
4580                 return NULL;
4581
4582         p->arg.fh = NFS_FH(inode);
4583         p->arg.fl = &p->fl;
4584         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4585         if (p->arg.open_seqid == NULL)
4586                 goto out_free;
4587         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4588         if (p->arg.lock_seqid == NULL)
4589                 goto out_free_seqid;
4590         p->arg.lock_stateid = &lsp->ls_stateid;
4591         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4592         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4593         p->arg.lock_owner.s_dev = server->s_dev;
4594         p->res.lock_seqid = p->arg.lock_seqid;
4595         p->lsp = lsp;
4596         p->server = server;
4597         atomic_inc(&lsp->ls_count);
4598         p->ctx = get_nfs_open_context(ctx);
4599         memcpy(&p->fl, fl, sizeof(p->fl));
4600         return p;
4601 out_free_seqid:
4602         nfs_free_seqid(p->arg.open_seqid);
4603 out_free:
4604         kfree(p);
4605         return NULL;
4606 }
4607
4608 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4609 {
4610         struct nfs4_lockdata *data = calldata;
4611         struct nfs4_state *state = data->lsp->ls_state;
4612
4613         dprintk("%s: begin!\n", __func__);
4614         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4615                 return;
4616         /* Do we need to do an open_to_lock_owner? */
4617         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4618                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4619                         goto out_release_lock_seqid;
4620                 }
4621                 data->arg.open_stateid = &state->stateid;
4622                 data->arg.new_lock_owner = 1;
4623                 data->res.open_seqid = data->arg.open_seqid;
4624         } else
4625                 data->arg.new_lock_owner = 0;
4626         data->timestamp = jiffies;
4627         if (nfs4_setup_sequence(data->server,
4628                                 &data->arg.seq_args,
4629                                 &data->res.seq_res,
4630                                 task) == 0)
4631                 return;
4632         nfs_release_seqid(data->arg.open_seqid);
4633 out_release_lock_seqid:
4634         nfs_release_seqid(data->arg.lock_seqid);
4635         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4636 }
4637
4638 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4639 {
4640         struct nfs4_lockdata *data = calldata;
4641
4642         dprintk("%s: begin!\n", __func__);
4643
4644         if (!nfs4_sequence_done(task, &data->res.seq_res))
4645                 return;
4646
4647         data->rpc_status = task->tk_status;
4648         if (data->arg.new_lock_owner != 0) {
4649                 if (data->rpc_status == 0)
4650                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4651                 else
4652                         goto out;
4653         }
4654         if (data->rpc_status == 0) {
4655                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4656                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4657                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4658         }
4659 out:
4660         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4661 }
4662
4663 static void nfs4_lock_release(void *calldata)
4664 {
4665         struct nfs4_lockdata *data = calldata;
4666
4667         dprintk("%s: begin!\n", __func__);
4668         nfs_free_seqid(data->arg.open_seqid);
4669         if (data->cancelled != 0) {
4670                 struct rpc_task *task;
4671                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4672                                 data->arg.lock_seqid);
4673                 if (!IS_ERR(task))
4674                         rpc_put_task_async(task);
4675                 dprintk("%s: cancelling lock!\n", __func__);
4676         } else
4677                 nfs_free_seqid(data->arg.lock_seqid);
4678         nfs4_put_lock_state(data->lsp);
4679         put_nfs_open_context(data->ctx);
4680         kfree(data);
4681         dprintk("%s: done!\n", __func__);
4682 }
4683
4684 static const struct rpc_call_ops nfs4_lock_ops = {
4685         .rpc_call_prepare = nfs4_lock_prepare,
4686         .rpc_call_done = nfs4_lock_done,
4687         .rpc_release = nfs4_lock_release,
4688 };
4689
4690 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4691 {
4692         switch (error) {
4693         case -NFS4ERR_ADMIN_REVOKED:
4694         case -NFS4ERR_BAD_STATEID:
4695                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4696                 if (new_lock_owner != 0 ||
4697                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4698                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4699                 break;
4700         case -NFS4ERR_STALE_STATEID:
4701                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4702         case -NFS4ERR_EXPIRED:
4703                 nfs4_schedule_lease_recovery(server->nfs_client);
4704         };
4705 }
4706
4707 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4708 {
4709         struct nfs4_lockdata *data;
4710         struct rpc_task *task;
4711         struct rpc_message msg = {
4712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4713                 .rpc_cred = state->owner->so_cred,
4714         };
4715         struct rpc_task_setup task_setup_data = {
4716                 .rpc_client = NFS_CLIENT(state->inode),
4717                 .rpc_message = &msg,
4718                 .callback_ops = &nfs4_lock_ops,
4719                 .workqueue = nfsiod_workqueue,
4720                 .flags = RPC_TASK_ASYNC,
4721         };
4722         int ret;
4723
4724         dprintk("%s: begin!\n", __func__);
4725         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4726                         fl->fl_u.nfs4_fl.owner,
4727                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4728         if (data == NULL)
4729                 return -ENOMEM;
4730         if (IS_SETLKW(cmd))
4731                 data->arg.block = 1;
4732         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4733         msg.rpc_argp = &data->arg;
4734         msg.rpc_resp = &data->res;
4735         task_setup_data.callback_data = data;
4736         if (recovery_type > NFS_LOCK_NEW) {
4737                 if (recovery_type == NFS_LOCK_RECLAIM)
4738                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4739                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4740         }
4741         task = rpc_run_task(&task_setup_data);
4742         if (IS_ERR(task))
4743                 return PTR_ERR(task);
4744         ret = nfs4_wait_for_completion_rpc_task(task);
4745         if (ret == 0) {
4746                 ret = data->rpc_status;
4747                 if (ret)
4748                         nfs4_handle_setlk_error(data->server, data->lsp,
4749                                         data->arg.new_lock_owner, ret);
4750         } else
4751                 data->cancelled = 1;
4752         rpc_put_task(task);
4753         dprintk("%s: done, ret = %d!\n", __func__, ret);
4754         return ret;
4755 }
4756
4757 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4758 {
4759         struct nfs_server *server = NFS_SERVER(state->inode);
4760         struct nfs4_exception exception = {
4761                 .inode = state->inode,
4762         };
4763         int err;
4764
4765         do {
4766                 /* Cache the lock if possible... */
4767                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4768                         return 0;
4769                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4770                 if (err != -NFS4ERR_DELAY)
4771                         break;
4772                 nfs4_handle_exception(server, err, &exception);
4773         } while (exception.retry);
4774         return err;
4775 }
4776
4777 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4778 {
4779         struct nfs_server *server = NFS_SERVER(state->inode);
4780         struct nfs4_exception exception = {
4781                 .inode = state->inode,
4782         };
4783         int err;
4784
4785         err = nfs4_set_lock_state(state, request);
4786         if (err != 0)
4787                 return err;
4788         do {
4789                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4790                         return 0;
4791                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4792                 switch (err) {
4793                 default:
4794                         goto out;
4795                 case -NFS4ERR_GRACE:
4796                 case -NFS4ERR_DELAY:
4797                         nfs4_handle_exception(server, err, &exception);
4798                         err = 0;
4799                 }
4800         } while (exception.retry);
4801 out:
4802         return err;
4803 }
4804
4805 #if defined(CONFIG_NFS_V4_1)
4806 /**
4807  * nfs41_check_expired_locks - possibly free a lock stateid
4808  *
4809  * @state: NFSv4 state for an inode
4810  *
4811  * Returns NFS_OK if recovery for this stateid is now finished.
4812  * Otherwise a negative NFS4ERR value is returned.
4813  */
4814 static int nfs41_check_expired_locks(struct nfs4_state *state)
4815 {
4816         int status, ret = -NFS4ERR_BAD_STATEID;
4817         struct nfs4_lock_state *lsp;
4818         struct nfs_server *server = NFS_SERVER(state->inode);
4819
4820         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4821                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4822                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4823                         if (status != NFS_OK) {
4824                                 /* Free the stateid unless the server
4825                                  * informs us the stateid is unrecognized. */
4826                                 if (status != -NFS4ERR_BAD_STATEID)
4827                                         nfs41_free_stateid(server,
4828                                                         &lsp->ls_stateid);
4829                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4830                                 ret = status;
4831                         }
4832                 }
4833         };
4834
4835         return ret;
4836 }
4837
4838 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4839 {
4840         int status = NFS_OK;
4841
4842         if (test_bit(LK_STATE_IN_USE, &state->flags))
4843                 status = nfs41_check_expired_locks(state);
4844         if (status != NFS_OK)
4845                 status = nfs4_lock_expired(state, request);
4846         return status;
4847 }
4848 #endif
4849
4850 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4851 {
4852         struct nfs4_state_owner *sp = state->owner;
4853         struct nfs_inode *nfsi = NFS_I(state->inode);
4854         unsigned char fl_flags = request->fl_flags;
4855         unsigned int seq;
4856         int status = -ENOLCK;
4857
4858         if ((fl_flags & FL_POSIX) &&
4859                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4860                 goto out;
4861         /* Is this a delegated open? */
4862         status = nfs4_set_lock_state(state, request);
4863         if (status != 0)
4864                 goto out;
4865         request->fl_flags |= FL_ACCESS;
4866         status = do_vfs_lock(request->fl_file, request);
4867         if (status < 0)
4868                 goto out;
4869         down_read(&nfsi->rwsem);
4870         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4871                 /* Yes: cache locks! */
4872                 /* ...but avoid races with delegation recall... */
4873                 request->fl_flags = fl_flags & ~FL_SLEEP;
4874                 status = do_vfs_lock(request->fl_file, request);
4875                 goto out_unlock;
4876         }
4877         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
4878         up_read(&nfsi->rwsem);
4879         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4880         if (status != 0)
4881                 goto out;
4882         down_read(&nfsi->rwsem);
4883         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
4884                 status = -NFS4ERR_DELAY;
4885                 goto out_unlock;
4886         }
4887         /* Note: we always want to sleep here! */
4888         request->fl_flags = fl_flags | FL_SLEEP;
4889         if (do_vfs_lock(request->fl_file, request) < 0)
4890                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4891                         "manager!\n", __func__);
4892 out_unlock:
4893         up_read(&nfsi->rwsem);
4894 out:
4895         request->fl_flags = fl_flags;
4896         return status;
4897 }
4898
4899 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4900 {
4901         struct nfs4_exception exception = {
4902                 .state = state,
4903                 .inode = state->inode,
4904         };
4905         int err;
4906
4907         do {
4908                 err = _nfs4_proc_setlk(state, cmd, request);
4909                 if (err == -NFS4ERR_DENIED)
4910                         err = -EAGAIN;
4911                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4912                                 err, &exception);
4913         } while (exception.retry);
4914         return err;
4915 }
4916
4917 static int
4918 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4919 {
4920         struct nfs_open_context *ctx;
4921         struct nfs4_state *state;
4922         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4923         int status;
4924
4925         /* verify open state */
4926         ctx = nfs_file_open_context(filp);
4927         state = ctx->state;
4928
4929         if (request->fl_start < 0 || request->fl_end < 0)
4930                 return -EINVAL;
4931
4932         if (IS_GETLK(cmd)) {
4933                 if (state != NULL)
4934                         return nfs4_proc_getlk(state, F_GETLK, request);
4935                 return 0;
4936         }
4937
4938         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4939                 return -EINVAL;
4940
4941         if (request->fl_type == F_UNLCK) {
4942                 if (state != NULL)
4943                         return nfs4_proc_unlck(state, cmd, request);
4944                 return 0;
4945         }
4946
4947         if (state == NULL)
4948                 return -ENOLCK;
4949         /*
4950          * Don't rely on the VFS having checked the file open mode,
4951          * since it won't do this for flock() locks.
4952          */
4953         switch (request->fl_type) {
4954         case F_RDLCK:
4955                 if (!(filp->f_mode & FMODE_READ))
4956                         return -EBADF;
4957                 break;
4958         case F_WRLCK:
4959                 if (!(filp->f_mode & FMODE_WRITE))
4960                         return -EBADF;
4961         }
4962
4963         do {
4964                 status = nfs4_proc_setlk(state, cmd, request);
4965                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4966                         break;
4967                 timeout = nfs4_set_lock_task_retry(timeout);
4968                 status = -ERESTARTSYS;
4969                 if (signalled())
4970                         break;
4971         } while(status < 0);
4972         return status;
4973 }
4974
4975 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4976 {
4977         struct nfs_server *server = NFS_SERVER(state->inode);
4978         struct nfs4_exception exception = { };
4979         int err;
4980
4981         err = nfs4_set_lock_state(state, fl);
4982         if (err != 0)
4983                 goto out;
4984         do {
4985                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4986                 switch (err) {
4987                         default:
4988                                 printk(KERN_ERR "NFS: %s: unhandled error "
4989                                         "%d.\n", __func__, err);
4990                         case 0:
4991                         case -ESTALE:
4992                                 goto out;
4993                         case -NFS4ERR_STALE_CLIENTID:
4994                         case -NFS4ERR_STALE_STATEID:
4995                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
4996                         case -NFS4ERR_EXPIRED:
4997                                 nfs4_schedule_lease_recovery(server->nfs_client);
4998                                 err = -EAGAIN;
4999                                 goto out;
5000                         case -NFS4ERR_BADSESSION:
5001                         case -NFS4ERR_BADSLOT:
5002                         case -NFS4ERR_BAD_HIGH_SLOT:
5003                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5004                         case -NFS4ERR_DEADSESSION:
5005                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5006                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5007                                 err = -EAGAIN;
5008                                 goto out;
5009                         case -NFS4ERR_DELEG_REVOKED:
5010                         case -NFS4ERR_ADMIN_REVOKED:
5011                         case -NFS4ERR_BAD_STATEID:
5012                         case -NFS4ERR_OPENMODE:
5013                                 nfs4_schedule_stateid_recovery(server, state);
5014                                 err = 0;
5015                                 goto out;
5016                         case -ENOMEM:
5017                         case -NFS4ERR_DENIED:
5018                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5019                                 err = 0;
5020                                 goto out;
5021                 }
5022                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5023                 err = nfs4_handle_exception(server, err, &exception);
5024         } while (exception.retry);
5025 out:
5026         return err;
5027 }
5028
5029 struct nfs_release_lockowner_data {
5030         struct nfs4_lock_state *lsp;
5031         struct nfs_server *server;
5032         struct nfs_release_lockowner_args args;
5033 };
5034
5035 static void nfs4_release_lockowner_release(void *calldata)
5036 {
5037         struct nfs_release_lockowner_data *data = calldata;
5038         nfs4_free_lock_state(data->server, data->lsp);
5039         kfree(calldata);
5040 }
5041
5042 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5043         .rpc_release = nfs4_release_lockowner_release,
5044 };
5045
5046 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5047 {
5048         struct nfs_server *server = lsp->ls_state->owner->so_server;
5049         struct nfs_release_lockowner_data *data;
5050         struct rpc_message msg = {
5051                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5052         };
5053
5054         if (server->nfs_client->cl_mvops->minor_version != 0)
5055                 return -EINVAL;
5056         data = kmalloc(sizeof(*data), GFP_NOFS);
5057         if (!data)
5058                 return -ENOMEM;
5059         data->lsp = lsp;
5060         data->server = server;
5061         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5062         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5063         data->args.lock_owner.s_dev = server->s_dev;
5064         msg.rpc_argp = &data->args;
5065         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5066         return 0;
5067 }
5068
5069 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5070
5071 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5072                                    const void *buf, size_t buflen,
5073                                    int flags, int type)
5074 {
5075         if (strcmp(key, "") != 0)
5076                 return -EINVAL;
5077
5078         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5079 }
5080
5081 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5082                                    void *buf, size_t buflen, int type)
5083 {
5084         if (strcmp(key, "") != 0)
5085                 return -EINVAL;
5086
5087         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5088 }
5089
5090 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5091                                        size_t list_len, const char *name,
5092                                        size_t name_len, int type)
5093 {
5094         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5095
5096         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5097                 return 0;
5098
5099         if (list && len <= list_len)
5100                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5101         return len;
5102 }
5103
5104 /*
5105  * nfs_fhget will use either the mounted_on_fileid or the fileid
5106  */
5107 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5108 {
5109         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5110                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5111               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5112               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5113                 return;
5114
5115         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5116                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5117         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5118         fattr->nlink = 2;
5119 }
5120
5121 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5122                                    const struct qstr *name,
5123                                    struct nfs4_fs_locations *fs_locations,
5124                                    struct page *page)
5125 {
5126         struct nfs_server *server = NFS_SERVER(dir);
5127         u32 bitmask[2] = {
5128                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5129         };
5130         struct nfs4_fs_locations_arg args = {
5131                 .dir_fh = NFS_FH(dir),
5132                 .name = name,
5133                 .page = page,
5134                 .bitmask = bitmask,
5135         };
5136         struct nfs4_fs_locations_res res = {
5137                 .fs_locations = fs_locations,
5138         };
5139         struct rpc_message msg = {
5140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5141                 .rpc_argp = &args,
5142                 .rpc_resp = &res,
5143         };
5144         int status;
5145
5146         dprintk("%s: start\n", __func__);
5147
5148         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5149          * is not supported */
5150         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5151                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5152         else
5153                 bitmask[0] |= FATTR4_WORD0_FILEID;
5154
5155         nfs_fattr_init(&fs_locations->fattr);
5156         fs_locations->server = server;
5157         fs_locations->nlocations = 0;
5158         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5159         dprintk("%s: returned status = %d\n", __func__, status);
5160         return status;
5161 }
5162
5163 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5164                            const struct qstr *name,
5165                            struct nfs4_fs_locations *fs_locations,
5166                            struct page *page)
5167 {
5168         struct nfs4_exception exception = { };
5169         int err;
5170         do {
5171                 err = nfs4_handle_exception(NFS_SERVER(dir),
5172                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5173                                 &exception);
5174         } while (exception.retry);
5175         return err;
5176 }
5177
5178 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5179 {
5180         int status;
5181         struct nfs4_secinfo_arg args = {
5182                 .dir_fh = NFS_FH(dir),
5183                 .name   = name,
5184         };
5185         struct nfs4_secinfo_res res = {
5186                 .flavors     = flavors,
5187         };
5188         struct rpc_message msg = {
5189                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5190                 .rpc_argp = &args,
5191                 .rpc_resp = &res,
5192         };
5193
5194         dprintk("NFS call  secinfo %s\n", name->name);
5195         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5196         dprintk("NFS reply  secinfo: %d\n", status);
5197         return status;
5198 }
5199
5200 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5201                       struct nfs4_secinfo_flavors *flavors)
5202 {
5203         struct nfs4_exception exception = { };
5204         int err;
5205         do {
5206                 err = nfs4_handle_exception(NFS_SERVER(dir),
5207                                 _nfs4_proc_secinfo(dir, name, flavors),
5208                                 &exception);
5209         } while (exception.retry);
5210         return err;
5211 }
5212
5213 #ifdef CONFIG_NFS_V4_1
5214 /*
5215  * Check the exchange flags returned by the server for invalid flags, having
5216  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5217  * DS flags set.
5218  */
5219 static int nfs4_check_cl_exchange_flags(u32 flags)
5220 {
5221         if (flags & ~EXCHGID4_FLAG_MASK_R)
5222                 goto out_inval;
5223         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5224             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5225                 goto out_inval;
5226         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5227                 goto out_inval;
5228         return NFS_OK;
5229 out_inval:
5230         return -NFS4ERR_INVAL;
5231 }
5232
5233 static bool
5234 nfs41_same_server_scope(struct nfs41_server_scope *a,
5235                         struct nfs41_server_scope *b)
5236 {
5237         if (a->server_scope_sz == b->server_scope_sz &&
5238             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5239                 return true;
5240
5241         return false;
5242 }
5243
5244 /*
5245  * nfs4_proc_bind_conn_to_session()
5246  *
5247  * The 4.1 client currently uses the same TCP connection for the
5248  * fore and backchannel.
5249  */
5250 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5251 {
5252         int status;
5253         struct nfs41_bind_conn_to_session_res res;
5254         struct rpc_message msg = {
5255                 .rpc_proc =
5256                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5257                 .rpc_argp = clp,
5258                 .rpc_resp = &res,
5259                 .rpc_cred = cred,
5260         };
5261
5262         dprintk("--> %s\n", __func__);
5263
5264         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5265         if (unlikely(res.session == NULL)) {
5266                 status = -ENOMEM;
5267                 goto out;
5268         }
5269
5270         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5271         if (status == 0) {
5272                 if (memcmp(res.session->sess_id.data,
5273                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5274                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5275                         status = -EIO;
5276                         goto out_session;
5277                 }
5278                 if (res.dir != NFS4_CDFS4_BOTH) {
5279                         dprintk("NFS: %s: Unexpected direction from server\n",
5280                                 __func__);
5281                         status = -EIO;
5282                         goto out_session;
5283                 }
5284                 if (res.use_conn_in_rdma_mode) {
5285                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5286                                 __func__);
5287                         status = -EIO;
5288                         goto out_session;
5289                 }
5290         }
5291 out_session:
5292         kfree(res.session);
5293 out:
5294         dprintk("<-- %s status= %d\n", __func__, status);
5295         return status;
5296 }
5297
5298 /*
5299  * nfs4_proc_exchange_id()
5300  *
5301  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5302  *
5303  * Since the clientid has expired, all compounds using sessions
5304  * associated with the stale clientid will be returning
5305  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5306  * be in some phase of session reset.
5307  */
5308 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5309 {
5310         nfs4_verifier verifier;
5311         struct nfs41_exchange_id_args args = {
5312                 .verifier = &verifier,
5313                 .client = clp,
5314                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5315         };
5316         struct nfs41_exchange_id_res res = {
5317                 0
5318         };
5319         int status;
5320         struct rpc_message msg = {
5321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5322                 .rpc_argp = &args,
5323                 .rpc_resp = &res,
5324                 .rpc_cred = cred,
5325         };
5326
5327         nfs4_init_boot_verifier(clp, &verifier);
5328         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5329                                                         sizeof(args.id));
5330         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5331                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5332                 args.id_len, args.id);
5333
5334         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5335                                         GFP_NOFS);
5336         if (unlikely(res.server_owner == NULL)) {
5337                 status = -ENOMEM;
5338                 goto out;
5339         }
5340
5341         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5342                                         GFP_NOFS);
5343         if (unlikely(res.server_scope == NULL)) {
5344                 status = -ENOMEM;
5345                 goto out_server_owner;
5346         }
5347
5348         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5349         if (unlikely(res.impl_id == NULL)) {
5350                 status = -ENOMEM;
5351                 goto out_server_scope;
5352         }
5353
5354         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5355         if (status == 0)
5356                 status = nfs4_check_cl_exchange_flags(res.flags);
5357
5358         if (status == 0) {
5359                 clp->cl_clientid = res.clientid;
5360                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5361                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5362                         clp->cl_seqid = res.seqid;
5363
5364                 kfree(clp->cl_serverowner);
5365                 clp->cl_serverowner = res.server_owner;
5366                 res.server_owner = NULL;
5367
5368                 /* use the most recent implementation id */
5369                 kfree(clp->cl_implid);
5370                 clp->cl_implid = res.impl_id;
5371
5372                 if (clp->cl_serverscope != NULL &&
5373                     !nfs41_same_server_scope(clp->cl_serverscope,
5374                                              res.server_scope)) {
5375                         dprintk("%s: server_scope mismatch detected\n",
5376                                 __func__);
5377                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5378                         kfree(clp->cl_serverscope);
5379                         clp->cl_serverscope = NULL;
5380                 }
5381
5382                 if (clp->cl_serverscope == NULL) {
5383                         clp->cl_serverscope = res.server_scope;
5384                         goto out;
5385                 }
5386         } else
5387                 kfree(res.impl_id);
5388
5389 out_server_owner:
5390         kfree(res.server_owner);
5391 out_server_scope:
5392         kfree(res.server_scope);
5393 out:
5394         if (clp->cl_implid != NULL)
5395                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5396                         "domain: %s, name: %s, date: %llu,%u\n",
5397                         clp->cl_implid->domain, clp->cl_implid->name,
5398                         clp->cl_implid->date.seconds,
5399                         clp->cl_implid->date.nseconds);
5400         dprintk("NFS reply exchange_id: %d\n", status);
5401         return status;
5402 }
5403
5404 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5405                 struct rpc_cred *cred)
5406 {
5407         struct rpc_message msg = {
5408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5409                 .rpc_argp = clp,
5410                 .rpc_cred = cred,
5411         };
5412         int status;
5413
5414         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5415         if (status)
5416                 dprintk("NFS: Got error %d from the server %s on "
5417                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5418         return status;
5419 }
5420
5421 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5422                 struct rpc_cred *cred)
5423 {
5424         unsigned int loop;
5425         int ret;
5426
5427         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5428                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5429                 switch (ret) {
5430                 case -NFS4ERR_DELAY:
5431                 case -NFS4ERR_CLIENTID_BUSY:
5432                         ssleep(1);
5433                         break;
5434                 default:
5435                         return ret;
5436                 }
5437         }
5438         return 0;
5439 }
5440
5441 int nfs4_destroy_clientid(struct nfs_client *clp)
5442 {
5443         struct rpc_cred *cred;
5444         int ret = 0;
5445
5446         if (clp->cl_mvops->minor_version < 1)
5447                 goto out;
5448         if (clp->cl_exchange_flags == 0)
5449                 goto out;
5450         if (clp->cl_preserve_clid)
5451                 goto out;
5452         cred = nfs4_get_exchange_id_cred(clp);
5453         ret = nfs4_proc_destroy_clientid(clp, cred);
5454         if (cred)
5455                 put_rpccred(cred);
5456         switch (ret) {
5457         case 0:
5458         case -NFS4ERR_STALE_CLIENTID:
5459                 clp->cl_exchange_flags = 0;
5460         }
5461 out:
5462         return ret;
5463 }
5464
5465 struct nfs4_get_lease_time_data {
5466         struct nfs4_get_lease_time_args *args;
5467         struct nfs4_get_lease_time_res *res;
5468         struct nfs_client *clp;
5469 };
5470
5471 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5472                                         void *calldata)
5473 {
5474         struct nfs4_get_lease_time_data *data =
5475                         (struct nfs4_get_lease_time_data *)calldata;
5476
5477         dprintk("--> %s\n", __func__);
5478         /* just setup sequence, do not trigger session recovery
5479            since we're invoked within one */
5480         nfs41_setup_sequence(data->clp->cl_session,
5481                         &data->args->la_seq_args,
5482                         &data->res->lr_seq_res,
5483                         task);
5484         dprintk("<-- %s\n", __func__);
5485 }
5486
5487 /*
5488  * Called from nfs4_state_manager thread for session setup, so don't recover
5489  * from sequence operation or clientid errors.
5490  */
5491 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5492 {
5493         struct nfs4_get_lease_time_data *data =
5494                         (struct nfs4_get_lease_time_data *)calldata;
5495
5496         dprintk("--> %s\n", __func__);
5497         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5498                 return;
5499         switch (task->tk_status) {
5500         case -NFS4ERR_DELAY:
5501         case -NFS4ERR_GRACE:
5502                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5503                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5504                 task->tk_status = 0;
5505                 /* fall through */
5506         case -NFS4ERR_RETRY_UNCACHED_REP:
5507                 rpc_restart_call_prepare(task);
5508                 return;
5509         }
5510         dprintk("<-- %s\n", __func__);
5511 }
5512
5513 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5514         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5515         .rpc_call_done = nfs4_get_lease_time_done,
5516 };
5517
5518 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5519 {
5520         struct rpc_task *task;
5521         struct nfs4_get_lease_time_args args;
5522         struct nfs4_get_lease_time_res res = {
5523                 .lr_fsinfo = fsinfo,
5524         };
5525         struct nfs4_get_lease_time_data data = {
5526                 .args = &args,
5527                 .res = &res,
5528                 .clp = clp,
5529         };
5530         struct rpc_message msg = {
5531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5532                 .rpc_argp = &args,
5533                 .rpc_resp = &res,
5534         };
5535         struct rpc_task_setup task_setup = {
5536                 .rpc_client = clp->cl_rpcclient,
5537                 .rpc_message = &msg,
5538                 .callback_ops = &nfs4_get_lease_time_ops,
5539                 .callback_data = &data,
5540                 .flags = RPC_TASK_TIMEOUT,
5541         };
5542         int status;
5543
5544         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5545         nfs4_set_sequence_privileged(&args.la_seq_args);
5546         dprintk("--> %s\n", __func__);
5547         task = rpc_run_task(&task_setup);
5548
5549         if (IS_ERR(task))
5550                 status = PTR_ERR(task);
5551         else {
5552                 status = task->tk_status;
5553                 rpc_put_task(task);
5554         }
5555         dprintk("<-- %s return %d\n", __func__, status);
5556
5557         return status;
5558 }
5559
5560 /*
5561  * Initialize the values to be used by the client in CREATE_SESSION
5562  * If nfs4_init_session set the fore channel request and response sizes,
5563  * use them.
5564  *
5565  * Set the back channel max_resp_sz_cached to zero to force the client to
5566  * always set csa_cachethis to FALSE because the current implementation
5567  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5568  */
5569 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5570 {
5571         struct nfs4_session *session = args->client->cl_session;
5572         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5573                      mxresp_sz = session->fc_target_max_resp_sz;
5574
5575         if (mxrqst_sz == 0)
5576                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5577         if (mxresp_sz == 0)
5578                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5579         /* Fore channel attributes */
5580         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5581         args->fc_attrs.max_resp_sz = mxresp_sz;
5582         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5583         args->fc_attrs.max_reqs = max_session_slots;
5584
5585         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5586                 "max_ops=%u max_reqs=%u\n",
5587                 __func__,
5588                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5589                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5590
5591         /* Back channel attributes */
5592         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5593         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5594         args->bc_attrs.max_resp_sz_cached = 0;
5595         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5596         args->bc_attrs.max_reqs = 1;
5597
5598         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5599                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5600                 __func__,
5601                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5602                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5603                 args->bc_attrs.max_reqs);
5604 }
5605
5606 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5607 {
5608         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5609         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5610
5611         if (rcvd->max_resp_sz > sent->max_resp_sz)
5612                 return -EINVAL;
5613         /*
5614          * Our requested max_ops is the minimum we need; we're not
5615          * prepared to break up compounds into smaller pieces than that.
5616          * So, no point even trying to continue if the server won't
5617          * cooperate:
5618          */
5619         if (rcvd->max_ops < sent->max_ops)
5620                 return -EINVAL;
5621         if (rcvd->max_reqs == 0)
5622                 return -EINVAL;
5623         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5624                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5625         return 0;
5626 }
5627
5628 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5629 {
5630         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5631         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5632
5633         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5634                 return -EINVAL;
5635         if (rcvd->max_resp_sz < sent->max_resp_sz)
5636                 return -EINVAL;
5637         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5638                 return -EINVAL;
5639         /* These would render the backchannel useless: */
5640         if (rcvd->max_ops != sent->max_ops)
5641                 return -EINVAL;
5642         if (rcvd->max_reqs != sent->max_reqs)
5643                 return -EINVAL;
5644         return 0;
5645 }
5646
5647 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5648                                      struct nfs4_session *session)
5649 {
5650         int ret;
5651
5652         ret = nfs4_verify_fore_channel_attrs(args, session);
5653         if (ret)
5654                 return ret;
5655         return nfs4_verify_back_channel_attrs(args, session);
5656 }
5657
5658 static int _nfs4_proc_create_session(struct nfs_client *clp,
5659                 struct rpc_cred *cred)
5660 {
5661         struct nfs4_session *session = clp->cl_session;
5662         struct nfs41_create_session_args args = {
5663                 .client = clp,
5664                 .cb_program = NFS4_CALLBACK,
5665         };
5666         struct nfs41_create_session_res res = {
5667                 .client = clp,
5668         };
5669         struct rpc_message msg = {
5670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5671                 .rpc_argp = &args,
5672                 .rpc_resp = &res,
5673                 .rpc_cred = cred,
5674         };
5675         int status;
5676
5677         nfs4_init_channel_attrs(&args);
5678         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5679
5680         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5681
5682         if (!status) {
5683                 /* Verify the session's negotiated channel_attrs values */
5684                 status = nfs4_verify_channel_attrs(&args, session);
5685                 /* Increment the clientid slot sequence id */
5686                 clp->cl_seqid++;
5687         }
5688
5689         return status;
5690 }
5691
5692 /*
5693  * Issues a CREATE_SESSION operation to the server.
5694  * It is the responsibility of the caller to verify the session is
5695  * expired before calling this routine.
5696  */
5697 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5698 {
5699         int status;
5700         unsigned *ptr;
5701         struct nfs4_session *session = clp->cl_session;
5702
5703         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5704
5705         status = _nfs4_proc_create_session(clp, cred);
5706         if (status)
5707                 goto out;
5708
5709         /* Init or reset the session slot tables */
5710         status = nfs4_setup_session_slot_tables(session);
5711         dprintk("slot table setup returned %d\n", status);
5712         if (status)
5713                 goto out;
5714
5715         ptr = (unsigned *)&session->sess_id.data[0];
5716         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5717                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5718 out:
5719         dprintk("<-- %s\n", __func__);
5720         return status;
5721 }
5722
5723 /*
5724  * Issue the over-the-wire RPC DESTROY_SESSION.
5725  * The caller must serialize access to this routine.
5726  */
5727 int nfs4_proc_destroy_session(struct nfs4_session *session,
5728                 struct rpc_cred *cred)
5729 {
5730         struct rpc_message msg = {
5731                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5732                 .rpc_argp = session,
5733                 .rpc_cred = cred,
5734         };
5735         int status = 0;
5736
5737         dprintk("--> nfs4_proc_destroy_session\n");
5738
5739         /* session is still being setup */
5740         if (session->clp->cl_cons_state != NFS_CS_READY)
5741                 return status;
5742
5743         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5744
5745         if (status)
5746                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5747                         "Session has been destroyed regardless...\n", status);
5748
5749         dprintk("<-- nfs4_proc_destroy_session\n");
5750         return status;
5751 }
5752
5753 /*
5754  * Renew the cl_session lease.
5755  */
5756 struct nfs4_sequence_data {
5757         struct nfs_client *clp;
5758         struct nfs4_sequence_args args;
5759         struct nfs4_sequence_res res;
5760 };
5761
5762 static void nfs41_sequence_release(void *data)
5763 {
5764         struct nfs4_sequence_data *calldata = data;
5765         struct nfs_client *clp = calldata->clp;
5766
5767         if (atomic_read(&clp->cl_count) > 1)
5768                 nfs4_schedule_state_renewal(clp);
5769         nfs_put_client(clp);
5770         kfree(calldata);
5771 }
5772
5773 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5774 {
5775         switch(task->tk_status) {
5776         case -NFS4ERR_DELAY:
5777                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5778                 return -EAGAIN;
5779         default:
5780                 nfs4_schedule_lease_recovery(clp);
5781         }
5782         return 0;
5783 }
5784
5785 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5786 {
5787         struct nfs4_sequence_data *calldata = data;
5788         struct nfs_client *clp = calldata->clp;
5789
5790         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5791                 return;
5792
5793         if (task->tk_status < 0) {
5794                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5795                 if (atomic_read(&clp->cl_count) == 1)
5796                         goto out;
5797
5798                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5799                         rpc_restart_call_prepare(task);
5800                         return;
5801                 }
5802         }
5803         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5804 out:
5805         dprintk("<-- %s\n", __func__);
5806 }
5807
5808 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5809 {
5810         struct nfs4_sequence_data *calldata = data;
5811         struct nfs_client *clp = calldata->clp;
5812         struct nfs4_sequence_args *args;
5813         struct nfs4_sequence_res *res;
5814
5815         args = task->tk_msg.rpc_argp;
5816         res = task->tk_msg.rpc_resp;
5817
5818         nfs41_setup_sequence(clp->cl_session, args, res, task);
5819 }
5820
5821 static const struct rpc_call_ops nfs41_sequence_ops = {
5822         .rpc_call_done = nfs41_sequence_call_done,
5823         .rpc_call_prepare = nfs41_sequence_prepare,
5824         .rpc_release = nfs41_sequence_release,
5825 };
5826
5827 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5828                 struct rpc_cred *cred,
5829                 bool is_privileged)
5830 {
5831         struct nfs4_sequence_data *calldata;
5832         struct rpc_message msg = {
5833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5834                 .rpc_cred = cred,
5835         };
5836         struct rpc_task_setup task_setup_data = {
5837                 .rpc_client = clp->cl_rpcclient,
5838                 .rpc_message = &msg,
5839                 .callback_ops = &nfs41_sequence_ops,
5840                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5841         };
5842
5843         if (!atomic_inc_not_zero(&clp->cl_count))
5844                 return ERR_PTR(-EIO);
5845         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5846         if (calldata == NULL) {
5847                 nfs_put_client(clp);
5848                 return ERR_PTR(-ENOMEM);
5849         }
5850         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5851         if (is_privileged)
5852                 nfs4_set_sequence_privileged(&calldata->args);
5853         msg.rpc_argp = &calldata->args;
5854         msg.rpc_resp = &calldata->res;
5855         calldata->clp = clp;
5856         task_setup_data.callback_data = calldata;
5857
5858         return rpc_run_task(&task_setup_data);
5859 }
5860
5861 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5862 {
5863         struct rpc_task *task;
5864         int ret = 0;
5865
5866         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5867                 return 0;
5868         task = _nfs41_proc_sequence(clp, cred, false);
5869         if (IS_ERR(task))
5870                 ret = PTR_ERR(task);
5871         else
5872                 rpc_put_task_async(task);
5873         dprintk("<-- %s status=%d\n", __func__, ret);
5874         return ret;
5875 }
5876
5877 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5878 {
5879         struct rpc_task *task;
5880         int ret;
5881
5882         task = _nfs41_proc_sequence(clp, cred, true);
5883         if (IS_ERR(task)) {
5884                 ret = PTR_ERR(task);
5885                 goto out;
5886         }
5887         ret = rpc_wait_for_completion_task(task);
5888         if (!ret) {
5889                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5890
5891                 if (task->tk_status == 0)
5892                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5893                 ret = task->tk_status;
5894         }
5895         rpc_put_task(task);
5896 out:
5897         dprintk("<-- %s status=%d\n", __func__, ret);
5898         return ret;
5899 }
5900
5901 struct nfs4_reclaim_complete_data {
5902         struct nfs_client *clp;
5903         struct nfs41_reclaim_complete_args arg;
5904         struct nfs41_reclaim_complete_res res;
5905 };
5906
5907 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5908 {
5909         struct nfs4_reclaim_complete_data *calldata = data;
5910
5911         nfs41_setup_sequence(calldata->clp->cl_session,
5912                         &calldata->arg.seq_args,
5913                         &calldata->res.seq_res,
5914                         task);
5915 }
5916
5917 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5918 {
5919         switch(task->tk_status) {
5920         case 0:
5921         case -NFS4ERR_COMPLETE_ALREADY:
5922         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5923                 break;
5924         case -NFS4ERR_DELAY:
5925                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5926                 /* fall through */
5927         case -NFS4ERR_RETRY_UNCACHED_REP:
5928                 return -EAGAIN;
5929         default:
5930                 nfs4_schedule_lease_recovery(clp);
5931         }
5932         return 0;
5933 }
5934
5935 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5936 {
5937         struct nfs4_reclaim_complete_data *calldata = data;
5938         struct nfs_client *clp = calldata->clp;
5939         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5940
5941         dprintk("--> %s\n", __func__);
5942         if (!nfs41_sequence_done(task, res))
5943                 return;
5944
5945         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5946                 rpc_restart_call_prepare(task);
5947                 return;
5948         }
5949         dprintk("<-- %s\n", __func__);
5950 }
5951
5952 static void nfs4_free_reclaim_complete_data(void *data)
5953 {
5954         struct nfs4_reclaim_complete_data *calldata = data;
5955
5956         kfree(calldata);
5957 }
5958
5959 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5960         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5961         .rpc_call_done = nfs4_reclaim_complete_done,
5962         .rpc_release = nfs4_free_reclaim_complete_data,
5963 };
5964
5965 /*
5966  * Issue a global reclaim complete.
5967  */
5968 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5969 {
5970         struct nfs4_reclaim_complete_data *calldata;
5971         struct rpc_task *task;
5972         struct rpc_message msg = {
5973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5974         };
5975         struct rpc_task_setup task_setup_data = {
5976                 .rpc_client = clp->cl_rpcclient,
5977                 .rpc_message = &msg,
5978                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5979                 .flags = RPC_TASK_ASYNC,
5980         };
5981         int status = -ENOMEM;
5982
5983         dprintk("--> %s\n", __func__);
5984         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5985         if (calldata == NULL)
5986                 goto out;
5987         calldata->clp = clp;
5988         calldata->arg.one_fs = 0;
5989
5990         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5991         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
5992         msg.rpc_argp = &calldata->arg;
5993         msg.rpc_resp = &calldata->res;
5994         task_setup_data.callback_data = calldata;
5995         task = rpc_run_task(&task_setup_data);
5996         if (IS_ERR(task)) {
5997                 status = PTR_ERR(task);
5998                 goto out;
5999         }
6000         status = nfs4_wait_for_completion_rpc_task(task);
6001         if (status == 0)
6002                 status = task->tk_status;
6003         rpc_put_task(task);
6004         return 0;
6005 out:
6006         dprintk("<-- %s status=%d\n", __func__, status);
6007         return status;
6008 }
6009
6010 static void
6011 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6012 {
6013         struct nfs4_layoutget *lgp = calldata;
6014         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6015         struct nfs4_session *session = nfs4_get_session(server);
6016
6017         dprintk("--> %s\n", __func__);
6018         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6019          * right now covering the LAYOUTGET we are about to send.
6020          * However, that is not so catastrophic, and there seems
6021          * to be no way to prevent it completely.
6022          */
6023         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6024                                 &lgp->res.seq_res, task))
6025                 return;
6026         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6027                                           NFS_I(lgp->args.inode)->layout,
6028                                           lgp->args.ctx->state)) {
6029                 rpc_exit(task, NFS4_OK);
6030         }
6031 }
6032
6033 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6034 {
6035         struct nfs4_layoutget *lgp = calldata;
6036         struct inode *inode = lgp->args.inode;
6037         struct nfs_server *server = NFS_SERVER(inode);
6038         struct pnfs_layout_hdr *lo;
6039         struct nfs4_state *state = NULL;
6040
6041         dprintk("--> %s\n", __func__);
6042
6043         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6044                 goto out;
6045
6046         switch (task->tk_status) {
6047         case 0:
6048                 goto out;
6049         case -NFS4ERR_LAYOUTTRYLATER:
6050         case -NFS4ERR_RECALLCONFLICT:
6051                 task->tk_status = -NFS4ERR_DELAY;
6052                 break;
6053         case -NFS4ERR_EXPIRED:
6054         case -NFS4ERR_BAD_STATEID:
6055                 spin_lock(&inode->i_lock);
6056                 lo = NFS_I(inode)->layout;
6057                 if (!lo || list_empty(&lo->plh_segs)) {
6058                         spin_unlock(&inode->i_lock);
6059                         /* If the open stateid was bad, then recover it. */
6060                         state = lgp->args.ctx->state;
6061                 } else {
6062                         LIST_HEAD(head);
6063
6064                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6065                         spin_unlock(&inode->i_lock);
6066                         /* Mark the bad layout state as invalid, then
6067                          * retry using the open stateid. */
6068                         pnfs_free_lseg_list(&head);
6069                 }
6070         }
6071         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6072                 rpc_restart_call_prepare(task);
6073 out:
6074         dprintk("<-- %s\n", __func__);
6075 }
6076
6077 static size_t max_response_pages(struct nfs_server *server)
6078 {
6079         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6080         return nfs_page_array_len(0, max_resp_sz);
6081 }
6082
6083 static void nfs4_free_pages(struct page **pages, size_t size)
6084 {
6085         int i;
6086
6087         if (!pages)
6088                 return;
6089
6090         for (i = 0; i < size; i++) {
6091                 if (!pages[i])
6092                         break;
6093                 __free_page(pages[i]);
6094         }
6095         kfree(pages);
6096 }
6097
6098 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6099 {
6100         struct page **pages;
6101         int i;
6102
6103         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6104         if (!pages) {
6105                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6106                 return NULL;
6107         }
6108
6109         for (i = 0; i < size; i++) {
6110                 pages[i] = alloc_page(gfp_flags);
6111                 if (!pages[i]) {
6112                         dprintk("%s: failed to allocate page\n", __func__);
6113                         nfs4_free_pages(pages, size);
6114                         return NULL;
6115                 }
6116         }
6117
6118         return pages;
6119 }
6120
6121 static void nfs4_layoutget_release(void *calldata)
6122 {
6123         struct nfs4_layoutget *lgp = calldata;
6124         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6125         size_t max_pages = max_response_pages(server);
6126
6127         dprintk("--> %s\n", __func__);
6128         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6129         put_nfs_open_context(lgp->args.ctx);
6130         kfree(calldata);
6131         dprintk("<-- %s\n", __func__);
6132 }
6133
6134 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6135         .rpc_call_prepare = nfs4_layoutget_prepare,
6136         .rpc_call_done = nfs4_layoutget_done,
6137         .rpc_release = nfs4_layoutget_release,
6138 };
6139
6140 struct pnfs_layout_segment *
6141 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6142 {
6143         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6144         size_t max_pages = max_response_pages(server);
6145         struct rpc_task *task;
6146         struct rpc_message msg = {
6147                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6148                 .rpc_argp = &lgp->args,
6149                 .rpc_resp = &lgp->res,
6150         };
6151         struct rpc_task_setup task_setup_data = {
6152                 .rpc_client = server->client,
6153                 .rpc_message = &msg,
6154                 .callback_ops = &nfs4_layoutget_call_ops,
6155                 .callback_data = lgp,
6156                 .flags = RPC_TASK_ASYNC,
6157         };
6158         struct pnfs_layout_segment *lseg = NULL;
6159         int status = 0;
6160
6161         dprintk("--> %s\n", __func__);
6162
6163         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6164         if (!lgp->args.layout.pages) {
6165                 nfs4_layoutget_release(lgp);
6166                 return ERR_PTR(-ENOMEM);
6167         }
6168         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6169
6170         lgp->res.layoutp = &lgp->args.layout;
6171         lgp->res.seq_res.sr_slot = NULL;
6172         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6173         task = rpc_run_task(&task_setup_data);
6174         if (IS_ERR(task))
6175                 return ERR_CAST(task);
6176         status = nfs4_wait_for_completion_rpc_task(task);
6177         if (status == 0)
6178                 status = task->tk_status;
6179         if (status == 0)
6180                 lseg = pnfs_layout_process(lgp);
6181         rpc_put_task(task);
6182         dprintk("<-- %s status=%d\n", __func__, status);
6183         if (status)
6184                 return ERR_PTR(status);
6185         return lseg;
6186 }
6187
6188 static void
6189 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6190 {
6191         struct nfs4_layoutreturn *lrp = calldata;
6192
6193         dprintk("--> %s\n", __func__);
6194         nfs41_setup_sequence(lrp->clp->cl_session,
6195                         &lrp->args.seq_args,
6196                         &lrp->res.seq_res,
6197                         task);
6198 }
6199
6200 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6201 {
6202         struct nfs4_layoutreturn *lrp = calldata;
6203         struct nfs_server *server;
6204
6205         dprintk("--> %s\n", __func__);
6206
6207         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6208                 return;
6209
6210         server = NFS_SERVER(lrp->args.inode);
6211         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6212                 rpc_restart_call_prepare(task);
6213                 return;
6214         }
6215         dprintk("<-- %s\n", __func__);
6216 }
6217
6218 static void nfs4_layoutreturn_release(void *calldata)
6219 {
6220         struct nfs4_layoutreturn *lrp = calldata;
6221         struct pnfs_layout_hdr *lo = lrp->args.layout;
6222
6223         dprintk("--> %s\n", __func__);
6224         spin_lock(&lo->plh_inode->i_lock);
6225         if (lrp->res.lrs_present)
6226                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6227         lo->plh_block_lgets--;
6228         spin_unlock(&lo->plh_inode->i_lock);
6229         pnfs_put_layout_hdr(lrp->args.layout);
6230         kfree(calldata);
6231         dprintk("<-- %s\n", __func__);
6232 }
6233
6234 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6235         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6236         .rpc_call_done = nfs4_layoutreturn_done,
6237         .rpc_release = nfs4_layoutreturn_release,
6238 };
6239
6240 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6241 {
6242         struct rpc_task *task;
6243         struct rpc_message msg = {
6244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6245                 .rpc_argp = &lrp->args,
6246                 .rpc_resp = &lrp->res,
6247         };
6248         struct rpc_task_setup task_setup_data = {
6249                 .rpc_client = lrp->clp->cl_rpcclient,
6250                 .rpc_message = &msg,
6251                 .callback_ops = &nfs4_layoutreturn_call_ops,
6252                 .callback_data = lrp,
6253         };
6254         int status;
6255
6256         dprintk("--> %s\n", __func__);
6257         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6258         task = rpc_run_task(&task_setup_data);
6259         if (IS_ERR(task))
6260                 return PTR_ERR(task);
6261         status = task->tk_status;
6262         dprintk("<-- %s status=%d\n", __func__, status);
6263         rpc_put_task(task);
6264         return status;
6265 }
6266
6267 /*
6268  * Retrieve the list of Data Server devices from the MDS.
6269  */
6270 static int _nfs4_getdevicelist(struct nfs_server *server,
6271                                     const struct nfs_fh *fh,
6272                                     struct pnfs_devicelist *devlist)
6273 {
6274         struct nfs4_getdevicelist_args args = {
6275                 .fh = fh,
6276                 .layoutclass = server->pnfs_curr_ld->id,
6277         };
6278         struct nfs4_getdevicelist_res res = {
6279                 .devlist = devlist,
6280         };
6281         struct rpc_message msg = {
6282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6283                 .rpc_argp = &args,
6284                 .rpc_resp = &res,
6285         };
6286         int status;
6287
6288         dprintk("--> %s\n", __func__);
6289         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6290                                 &res.seq_res, 0);
6291         dprintk("<-- %s status=%d\n", __func__, status);
6292         return status;
6293 }
6294
6295 int nfs4_proc_getdevicelist(struct nfs_server *server,
6296                             const struct nfs_fh *fh,
6297                             struct pnfs_devicelist *devlist)
6298 {
6299         struct nfs4_exception exception = { };
6300         int err;
6301
6302         do {
6303                 err = nfs4_handle_exception(server,
6304                                 _nfs4_getdevicelist(server, fh, devlist),
6305                                 &exception);
6306         } while (exception.retry);
6307
6308         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6309                 err, devlist->num_devs);
6310
6311         return err;
6312 }
6313 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6314
6315 static int
6316 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6317 {
6318         struct nfs4_getdeviceinfo_args args = {
6319                 .pdev = pdev,
6320         };
6321         struct nfs4_getdeviceinfo_res res = {
6322                 .pdev = pdev,
6323         };
6324         struct rpc_message msg = {
6325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6326                 .rpc_argp = &args,
6327                 .rpc_resp = &res,
6328         };
6329         int status;
6330
6331         dprintk("--> %s\n", __func__);
6332         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6333         dprintk("<-- %s status=%d\n", __func__, status);
6334
6335         return status;
6336 }
6337
6338 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6339 {
6340         struct nfs4_exception exception = { };
6341         int err;
6342
6343         do {
6344                 err = nfs4_handle_exception(server,
6345                                         _nfs4_proc_getdeviceinfo(server, pdev),
6346                                         &exception);
6347         } while (exception.retry);
6348         return err;
6349 }
6350 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6351
6352 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6353 {
6354         struct nfs4_layoutcommit_data *data = calldata;
6355         struct nfs_server *server = NFS_SERVER(data->args.inode);
6356         struct nfs4_session *session = nfs4_get_session(server);
6357
6358         nfs41_setup_sequence(session,
6359                         &data->args.seq_args,
6360                         &data->res.seq_res,
6361                         task);
6362 }
6363
6364 static void
6365 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6366 {
6367         struct nfs4_layoutcommit_data *data = calldata;
6368         struct nfs_server *server = NFS_SERVER(data->args.inode);
6369
6370         if (!nfs41_sequence_done(task, &data->res.seq_res))
6371                 return;
6372
6373         switch (task->tk_status) { /* Just ignore these failures */
6374         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6375         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6376         case -NFS4ERR_BADLAYOUT:     /* no layout */
6377         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6378                 task->tk_status = 0;
6379                 break;
6380         case 0:
6381                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6382                                                    data->res.fattr);
6383                 break;
6384         default:
6385                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6386                         rpc_restart_call_prepare(task);
6387                         return;
6388                 }
6389         }
6390 }
6391
6392 static void nfs4_layoutcommit_release(void *calldata)
6393 {
6394         struct nfs4_layoutcommit_data *data = calldata;
6395         struct pnfs_layout_segment *lseg, *tmp;
6396         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6397
6398         pnfs_cleanup_layoutcommit(data);
6399         /* Matched by references in pnfs_set_layoutcommit */
6400         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6401                 list_del_init(&lseg->pls_lc_list);
6402                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6403                                        &lseg->pls_flags))
6404                         pnfs_put_lseg(lseg);
6405         }
6406
6407         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6408         smp_mb__after_clear_bit();
6409         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6410
6411         put_rpccred(data->cred);
6412         kfree(data);
6413 }
6414
6415 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6416         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6417         .rpc_call_done = nfs4_layoutcommit_done,
6418         .rpc_release = nfs4_layoutcommit_release,
6419 };
6420
6421 int
6422 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6423 {
6424         struct rpc_message msg = {
6425                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6426                 .rpc_argp = &data->args,
6427                 .rpc_resp = &data->res,
6428                 .rpc_cred = data->cred,
6429         };
6430         struct rpc_task_setup task_setup_data = {
6431                 .task = &data->task,
6432                 .rpc_client = NFS_CLIENT(data->args.inode),
6433                 .rpc_message = &msg,
6434                 .callback_ops = &nfs4_layoutcommit_ops,
6435                 .callback_data = data,
6436                 .flags = RPC_TASK_ASYNC,
6437         };
6438         struct rpc_task *task;
6439         int status = 0;
6440
6441         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6442                 "lbw: %llu inode %lu\n",
6443                 data->task.tk_pid, sync,
6444                 data->args.lastbytewritten,
6445                 data->args.inode->i_ino);
6446
6447         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6448         task = rpc_run_task(&task_setup_data);
6449         if (IS_ERR(task))
6450                 return PTR_ERR(task);
6451         if (sync == false)
6452                 goto out;
6453         status = nfs4_wait_for_completion_rpc_task(task);
6454         if (status != 0)
6455                 goto out;
6456         status = task->tk_status;
6457 out:
6458         dprintk("%s: status %d\n", __func__, status);
6459         rpc_put_task(task);
6460         return status;
6461 }
6462
6463 static int
6464 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6465                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6466 {
6467         struct nfs41_secinfo_no_name_args args = {
6468                 .style = SECINFO_STYLE_CURRENT_FH,
6469         };
6470         struct nfs4_secinfo_res res = {
6471                 .flavors = flavors,
6472         };
6473         struct rpc_message msg = {
6474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6475                 .rpc_argp = &args,
6476                 .rpc_resp = &res,
6477         };
6478         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6479 }
6480
6481 static int
6482 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6483                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6484 {
6485         struct nfs4_exception exception = { };
6486         int err;
6487         do {
6488                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6489                 switch (err) {
6490                 case 0:
6491                 case -NFS4ERR_WRONGSEC:
6492                 case -NFS4ERR_NOTSUPP:
6493                         goto out;
6494                 default:
6495                         err = nfs4_handle_exception(server, err, &exception);
6496                 }
6497         } while (exception.retry);
6498 out:
6499         return err;
6500 }
6501
6502 static int
6503 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6504                     struct nfs_fsinfo *info)
6505 {
6506         int err;
6507         struct page *page;
6508         rpc_authflavor_t flavor;
6509         struct nfs4_secinfo_flavors *flavors;
6510
6511         page = alloc_page(GFP_KERNEL);
6512         if (!page) {
6513                 err = -ENOMEM;
6514                 goto out;
6515         }
6516
6517         flavors = page_address(page);
6518         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6519
6520         /*
6521          * Fall back on "guess and check" method if
6522          * the server doesn't support SECINFO_NO_NAME
6523          */
6524         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6525                 err = nfs4_find_root_sec(server, fhandle, info);
6526                 goto out_freepage;
6527         }
6528         if (err)
6529                 goto out_freepage;
6530
6531         flavor = nfs_find_best_sec(flavors);
6532         if (err == 0)
6533                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6534
6535 out_freepage:
6536         put_page(page);
6537         if (err == -EACCES)
6538                 return -EPERM;
6539 out:
6540         return err;
6541 }
6542
6543 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6544 {
6545         int status;
6546         struct nfs41_test_stateid_args args = {
6547                 .stateid = stateid,
6548         };
6549         struct nfs41_test_stateid_res res;
6550         struct rpc_message msg = {
6551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6552                 .rpc_argp = &args,
6553                 .rpc_resp = &res,
6554         };
6555
6556         dprintk("NFS call  test_stateid %p\n", stateid);
6557         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6558         nfs4_set_sequence_privileged(&args.seq_args);
6559         status = nfs4_call_sync_sequence(server->client, server, &msg,
6560                         &args.seq_args, &res.seq_res);
6561         if (status != NFS_OK) {
6562                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6563                 return status;
6564         }
6565         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6566         return -res.status;
6567 }
6568
6569 /**
6570  * nfs41_test_stateid - perform a TEST_STATEID operation
6571  *
6572  * @server: server / transport on which to perform the operation
6573  * @stateid: state ID to test
6574  *
6575  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6576  * Otherwise a negative NFS4ERR value is returned if the operation
6577  * failed or the state ID is not currently valid.
6578  */
6579 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6580 {
6581         struct nfs4_exception exception = { };
6582         int err;
6583         do {
6584                 err = _nfs41_test_stateid(server, stateid);
6585                 if (err != -NFS4ERR_DELAY)
6586                         break;
6587                 nfs4_handle_exception(server, err, &exception);
6588         } while (exception.retry);
6589         return err;
6590 }
6591
6592 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6593 {
6594         struct nfs41_free_stateid_args args = {
6595                 .stateid = stateid,
6596         };
6597         struct nfs41_free_stateid_res res;
6598         struct rpc_message msg = {
6599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6600                 .rpc_argp = &args,
6601                 .rpc_resp = &res,
6602         };
6603         int status;
6604
6605         dprintk("NFS call  free_stateid %p\n", stateid);
6606         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6607         nfs4_set_sequence_privileged(&args.seq_args);
6608         status = nfs4_call_sync_sequence(server->client, server, &msg,
6609                         &args.seq_args, &res.seq_res);
6610         dprintk("NFS reply free_stateid: %d\n", status);
6611         return status;
6612 }
6613
6614 /**
6615  * nfs41_free_stateid - perform a FREE_STATEID operation
6616  *
6617  * @server: server / transport on which to perform the operation
6618  * @stateid: state ID to release
6619  *
6620  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6621  * negative NFS4ERR value is returned.
6622  */
6623 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6624 {
6625         struct nfs4_exception exception = { };
6626         int err;
6627         do {
6628                 err = _nfs4_free_stateid(server, stateid);
6629                 if (err != -NFS4ERR_DELAY)
6630                         break;
6631                 nfs4_handle_exception(server, err, &exception);
6632         } while (exception.retry);
6633         return err;
6634 }
6635
6636 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6637                 const nfs4_stateid *s2)
6638 {
6639         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6640                 return false;
6641
6642         if (s1->seqid == s2->seqid)
6643                 return true;
6644         if (s1->seqid == 0 || s2->seqid == 0)
6645                 return true;
6646
6647         return false;
6648 }
6649
6650 #endif /* CONFIG_NFS_V4_1 */
6651
6652 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6653                 const nfs4_stateid *s2)
6654 {
6655         return nfs4_stateid_match(s1, s2);
6656 }
6657
6658
6659 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6660         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6661         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6662         .recover_open   = nfs4_open_reclaim,
6663         .recover_lock   = nfs4_lock_reclaim,
6664         .establish_clid = nfs4_init_clientid,
6665         .get_clid_cred  = nfs4_get_setclientid_cred,
6666         .detect_trunking = nfs40_discover_server_trunking,
6667 };
6668
6669 #if defined(CONFIG_NFS_V4_1)
6670 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6671         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6672         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6673         .recover_open   = nfs4_open_reclaim,
6674         .recover_lock   = nfs4_lock_reclaim,
6675         .establish_clid = nfs41_init_clientid,
6676         .get_clid_cred  = nfs4_get_exchange_id_cred,
6677         .reclaim_complete = nfs41_proc_reclaim_complete,
6678         .detect_trunking = nfs41_discover_server_trunking,
6679 };
6680 #endif /* CONFIG_NFS_V4_1 */
6681
6682 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6683         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6684         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6685         .recover_open   = nfs4_open_expired,
6686         .recover_lock   = nfs4_lock_expired,
6687         .establish_clid = nfs4_init_clientid,
6688         .get_clid_cred  = nfs4_get_setclientid_cred,
6689 };
6690
6691 #if defined(CONFIG_NFS_V4_1)
6692 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6693         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6694         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6695         .recover_open   = nfs41_open_expired,
6696         .recover_lock   = nfs41_lock_expired,
6697         .establish_clid = nfs41_init_clientid,
6698         .get_clid_cred  = nfs4_get_exchange_id_cred,
6699 };
6700 #endif /* CONFIG_NFS_V4_1 */
6701
6702 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6703         .sched_state_renewal = nfs4_proc_async_renew,
6704         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6705         .renew_lease = nfs4_proc_renew,
6706 };
6707
6708 #if defined(CONFIG_NFS_V4_1)
6709 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6710         .sched_state_renewal = nfs41_proc_async_sequence,
6711         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6712         .renew_lease = nfs4_proc_sequence,
6713 };
6714 #endif
6715
6716 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6717         .minor_version = 0,
6718         .call_sync = _nfs4_call_sync,
6719         .match_stateid = nfs4_match_stateid,
6720         .find_root_sec = nfs4_find_root_sec,
6721         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6722         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6723         .state_renewal_ops = &nfs40_state_renewal_ops,
6724 };
6725
6726 #if defined(CONFIG_NFS_V4_1)
6727 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6728         .minor_version = 1,
6729         .call_sync = nfs4_call_sync_sequence,
6730         .match_stateid = nfs41_match_stateid,
6731         .find_root_sec = nfs41_find_root_sec,
6732         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6733         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6734         .state_renewal_ops = &nfs41_state_renewal_ops,
6735 };
6736 #endif
6737
6738 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6739         [0] = &nfs_v4_0_minor_ops,
6740 #if defined(CONFIG_NFS_V4_1)
6741         [1] = &nfs_v4_1_minor_ops,
6742 #endif
6743 };
6744
6745 const struct inode_operations nfs4_dir_inode_operations = {
6746         .create         = nfs_create,
6747         .lookup         = nfs_lookup,
6748         .atomic_open    = nfs_atomic_open,
6749         .link           = nfs_link,
6750         .unlink         = nfs_unlink,
6751         .symlink        = nfs_symlink,
6752         .mkdir          = nfs_mkdir,
6753         .rmdir          = nfs_rmdir,
6754         .mknod          = nfs_mknod,
6755         .rename         = nfs_rename,
6756         .permission     = nfs_permission,
6757         .getattr        = nfs_getattr,
6758         .setattr        = nfs_setattr,
6759         .getxattr       = generic_getxattr,
6760         .setxattr       = generic_setxattr,
6761         .listxattr      = generic_listxattr,
6762         .removexattr    = generic_removexattr,
6763 };
6764
6765 static const struct inode_operations nfs4_file_inode_operations = {
6766         .permission     = nfs_permission,
6767         .getattr        = nfs_getattr,
6768         .setattr        = nfs_setattr,
6769         .getxattr       = generic_getxattr,
6770         .setxattr       = generic_setxattr,
6771         .listxattr      = generic_listxattr,
6772         .removexattr    = generic_removexattr,
6773 };
6774
6775 const struct nfs_rpc_ops nfs_v4_clientops = {
6776         .version        = 4,                    /* protocol version */
6777         .dentry_ops     = &nfs4_dentry_operations,
6778         .dir_inode_ops  = &nfs4_dir_inode_operations,
6779         .file_inode_ops = &nfs4_file_inode_operations,
6780         .file_ops       = &nfs4_file_operations,
6781         .getroot        = nfs4_proc_get_root,
6782         .submount       = nfs4_submount,
6783         .try_mount      = nfs4_try_mount,
6784         .getattr        = nfs4_proc_getattr,
6785         .setattr        = nfs4_proc_setattr,
6786         .lookup         = nfs4_proc_lookup,
6787         .access         = nfs4_proc_access,
6788         .readlink       = nfs4_proc_readlink,
6789         .create         = nfs4_proc_create,
6790         .remove         = nfs4_proc_remove,
6791         .unlink_setup   = nfs4_proc_unlink_setup,
6792         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6793         .unlink_done    = nfs4_proc_unlink_done,
6794         .rename         = nfs4_proc_rename,
6795         .rename_setup   = nfs4_proc_rename_setup,
6796         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6797         .rename_done    = nfs4_proc_rename_done,
6798         .link           = nfs4_proc_link,
6799         .symlink        = nfs4_proc_symlink,
6800         .mkdir          = nfs4_proc_mkdir,
6801         .rmdir          = nfs4_proc_remove,
6802         .readdir        = nfs4_proc_readdir,
6803         .mknod          = nfs4_proc_mknod,
6804         .statfs         = nfs4_proc_statfs,
6805         .fsinfo         = nfs4_proc_fsinfo,
6806         .pathconf       = nfs4_proc_pathconf,
6807         .set_capabilities = nfs4_server_capabilities,
6808         .decode_dirent  = nfs4_decode_dirent,
6809         .read_setup     = nfs4_proc_read_setup,
6810         .read_pageio_init = pnfs_pageio_init_read,
6811         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6812         .read_done      = nfs4_read_done,
6813         .write_setup    = nfs4_proc_write_setup,
6814         .write_pageio_init = pnfs_pageio_init_write,
6815         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6816         .write_done     = nfs4_write_done,
6817         .commit_setup   = nfs4_proc_commit_setup,
6818         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6819         .commit_done    = nfs4_commit_done,
6820         .lock           = nfs4_proc_lock,
6821         .clear_acl_cache = nfs4_zap_acl_attr,
6822         .close_context  = nfs4_close_context,
6823         .open_context   = nfs4_atomic_open,
6824         .have_delegation = nfs4_have_delegation,
6825         .return_delegation = nfs4_inode_return_delegation,
6826         .alloc_client   = nfs4_alloc_client,
6827         .init_client    = nfs4_init_client,
6828         .free_client    = nfs4_free_client,
6829         .create_server  = nfs4_create_server,
6830         .clone_server   = nfs_clone_server,
6831 };
6832
6833 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6834         .prefix = XATTR_NAME_NFSV4_ACL,
6835         .list   = nfs4_xattr_list_nfs4_acl,
6836         .get    = nfs4_xattr_get_nfs4_acl,
6837         .set    = nfs4_xattr_set_nfs4_acl,
6838 };
6839
6840 const struct xattr_handler *nfs4_xattr_handlers[] = {
6841         &nfs4_xattr_nfs4_acl_handler,
6842         NULL
6843 };
6844
6845 /*
6846  * Local variables:
6847  *  c-basic-offset: 8
6848  * End:
6849  */