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                 goto out_wait;
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 out_wait:
1505         nfs4_sequence_done(task, &data->o_res.seq_res);
1506 }
1507
1508 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1509 {
1510         struct nfs4_opendata *data = calldata;
1511
1512         data->rpc_status = task->tk_status;
1513
1514         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1515                 return;
1516
1517         if (task->tk_status == 0) {
1518                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1519                         switch (data->o_res.f_attr->mode & S_IFMT) {
1520                         case S_IFREG:
1521                                 break;
1522                         case S_IFLNK:
1523                                 data->rpc_status = -ELOOP;
1524                                 break;
1525                         case S_IFDIR:
1526                                 data->rpc_status = -EISDIR;
1527                                 break;
1528                         default:
1529                                 data->rpc_status = -ENOTDIR;
1530                         }
1531                 }
1532                 renew_lease(data->o_res.server, data->timestamp);
1533                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1534                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1535         }
1536         data->rpc_done = 1;
1537 }
1538
1539 static void nfs4_open_release(void *calldata)
1540 {
1541         struct nfs4_opendata *data = calldata;
1542         struct nfs4_state *state = NULL;
1543
1544         /* If this request hasn't been cancelled, do nothing */
1545         if (data->cancelled == 0)
1546                 goto out_free;
1547         /* In case of error, no cleanup! */
1548         if (data->rpc_status != 0 || !data->rpc_done)
1549                 goto out_free;
1550         /* In case we need an open_confirm, no cleanup! */
1551         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1552                 goto out_free;
1553         state = nfs4_opendata_to_nfs4_state(data);
1554         if (!IS_ERR(state))
1555                 nfs4_close_state(state, data->o_arg.fmode);
1556 out_free:
1557         nfs4_opendata_put(data);
1558 }
1559
1560 static const struct rpc_call_ops nfs4_open_ops = {
1561         .rpc_call_prepare = nfs4_open_prepare,
1562         .rpc_call_done = nfs4_open_done,
1563         .rpc_release = nfs4_open_release,
1564 };
1565
1566 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1567 {
1568         struct inode *dir = data->dir->d_inode;
1569         struct nfs_server *server = NFS_SERVER(dir);
1570         struct nfs_openargs *o_arg = &data->o_arg;
1571         struct nfs_openres *o_res = &data->o_res;
1572         struct rpc_task *task;
1573         struct rpc_message msg = {
1574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1575                 .rpc_argp = o_arg,
1576                 .rpc_resp = o_res,
1577                 .rpc_cred = data->owner->so_cred,
1578         };
1579         struct rpc_task_setup task_setup_data = {
1580                 .rpc_client = server->client,
1581                 .rpc_message = &msg,
1582                 .callback_ops = &nfs4_open_ops,
1583                 .callback_data = data,
1584                 .workqueue = nfsiod_workqueue,
1585                 .flags = RPC_TASK_ASYNC,
1586         };
1587         int status;
1588
1589         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1590         kref_get(&data->kref);
1591         data->rpc_done = 0;
1592         data->rpc_status = 0;
1593         data->cancelled = 0;
1594         if (isrecover)
1595                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1596         task = rpc_run_task(&task_setup_data);
1597         if (IS_ERR(task))
1598                 return PTR_ERR(task);
1599         status = nfs4_wait_for_completion_rpc_task(task);
1600         if (status != 0) {
1601                 data->cancelled = 1;
1602                 smp_wmb();
1603         } else
1604                 status = data->rpc_status;
1605         rpc_put_task(task);
1606
1607         return status;
1608 }
1609
1610 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1611 {
1612         struct inode *dir = data->dir->d_inode;
1613         struct nfs_openres *o_res = &data->o_res;
1614         int status;
1615
1616         status = nfs4_run_open_task(data, 1);
1617         if (status != 0 || !data->rpc_done)
1618                 return status;
1619
1620         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1621
1622         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1623                 status = _nfs4_proc_open_confirm(data);
1624                 if (status != 0)
1625                         return status;
1626         }
1627
1628         return status;
1629 }
1630
1631 static int nfs4_opendata_access(struct rpc_cred *cred,
1632                                 struct nfs4_opendata *opendata,
1633                                 struct nfs4_state *state, fmode_t fmode,
1634                                 int openflags)
1635 {
1636         struct nfs_access_entry cache;
1637         u32 mask;
1638
1639         /* access call failed or for some reason the server doesn't
1640          * support any access modes -- defer access call until later */
1641         if (opendata->o_res.access_supported == 0)
1642                 return 0;
1643
1644         mask = 0;
1645         /* don't check MAY_WRITE - a newly created file may not have
1646          * write mode bits, but POSIX allows the creating process to write.
1647          * use openflags to check for exec, because fmode won't
1648          * always have FMODE_EXEC set when file open for exec. */
1649         if (openflags & __FMODE_EXEC) {
1650                 /* ONLY check for exec rights */
1651                 mask = MAY_EXEC;
1652         } else if (fmode & FMODE_READ)
1653                 mask = MAY_READ;
1654
1655         cache.cred = cred;
1656         cache.jiffies = jiffies;
1657         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1658         nfs_access_add_cache(state->inode, &cache);
1659
1660         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1661                 return 0;
1662
1663         /* even though OPEN succeeded, access is denied. Close the file */
1664         nfs4_close_state(state, fmode);
1665         return -EACCES;
1666 }
1667
1668 /*
1669  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1670  */
1671 static int _nfs4_proc_open(struct nfs4_opendata *data)
1672 {
1673         struct inode *dir = data->dir->d_inode;
1674         struct nfs_server *server = NFS_SERVER(dir);
1675         struct nfs_openargs *o_arg = &data->o_arg;
1676         struct nfs_openres *o_res = &data->o_res;
1677         int status;
1678
1679         status = nfs4_run_open_task(data, 0);
1680         if (!data->rpc_done)
1681                 return status;
1682         if (status != 0) {
1683                 if (status == -NFS4ERR_BADNAME &&
1684                                 !(o_arg->open_flags & O_CREAT))
1685                         return -ENOENT;
1686                 return status;
1687         }
1688
1689         nfs_fattr_map_and_free_names(server, &data->f_attr);
1690
1691         if (o_arg->open_flags & O_CREAT)
1692                 update_changeattr(dir, &o_res->cinfo);
1693         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1694                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1695         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1696                 status = _nfs4_proc_open_confirm(data);
1697                 if (status != 0)
1698                         return status;
1699         }
1700         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1701                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1702         return 0;
1703 }
1704
1705 static int nfs4_recover_expired_lease(struct nfs_server *server)
1706 {
1707         return nfs4_client_recover_expired_lease(server->nfs_client);
1708 }
1709
1710 /*
1711  * OPEN_EXPIRED:
1712  *      reclaim state on the server after a network partition.
1713  *      Assumes caller holds the appropriate lock
1714  */
1715 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1716 {
1717         struct nfs4_opendata *opendata;
1718         int ret;
1719
1720         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1721         if (IS_ERR(opendata))
1722                 return PTR_ERR(opendata);
1723         ret = nfs4_open_recover(opendata, state);
1724         if (ret == -ESTALE)
1725                 d_drop(ctx->dentry);
1726         nfs4_opendata_put(opendata);
1727         return ret;
1728 }
1729
1730 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1731 {
1732         struct nfs_server *server = NFS_SERVER(state->inode);
1733         struct nfs4_exception exception = { };
1734         int err;
1735
1736         do {
1737                 err = _nfs4_open_expired(ctx, state);
1738                 switch (err) {
1739                 default:
1740                         goto out;
1741                 case -NFS4ERR_GRACE:
1742                 case -NFS4ERR_DELAY:
1743                         nfs4_handle_exception(server, err, &exception);
1744                         err = 0;
1745                 }
1746         } while (exception.retry);
1747 out:
1748         return err;
1749 }
1750
1751 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1752 {
1753         struct nfs_open_context *ctx;
1754         int ret;
1755
1756         ctx = nfs4_state_find_open_context(state);
1757         if (IS_ERR(ctx))
1758                 return PTR_ERR(ctx);
1759         ret = nfs4_do_open_expired(ctx, state);
1760         put_nfs_open_context(ctx);
1761         return ret;
1762 }
1763
1764 #if defined(CONFIG_NFS_V4_1)
1765 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1766 {
1767         struct nfs_server *server = NFS_SERVER(state->inode);
1768         nfs4_stateid *stateid = &state->stateid;
1769         int status;
1770
1771         /* If a state reset has been done, test_stateid is unneeded */
1772         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1773                 return;
1774
1775         status = nfs41_test_stateid(server, stateid);
1776         if (status != NFS_OK) {
1777                 /* Free the stateid unless the server explicitly
1778                  * informs us the stateid is unrecognized. */
1779                 if (status != -NFS4ERR_BAD_STATEID)
1780                         nfs41_free_stateid(server, stateid);
1781                 nfs_remove_bad_delegation(state->inode);
1782
1783                 write_seqlock(&state->seqlock);
1784                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1785                 write_sequnlock(&state->seqlock);
1786                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1787         }
1788 }
1789
1790 /**
1791  * nfs41_check_open_stateid - possibly free an open stateid
1792  *
1793  * @state: NFSv4 state for an inode
1794  *
1795  * Returns NFS_OK if recovery for this stateid is now finished.
1796  * Otherwise a negative NFS4ERR value is returned.
1797  */
1798 static int nfs41_check_open_stateid(struct nfs4_state *state)
1799 {
1800         struct nfs_server *server = NFS_SERVER(state->inode);
1801         nfs4_stateid *stateid = &state->open_stateid;
1802         int status;
1803
1804         /* If a state reset has been done, test_stateid is unneeded */
1805         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1806             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1807             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1808                 return -NFS4ERR_BAD_STATEID;
1809
1810         status = nfs41_test_stateid(server, stateid);
1811         if (status != NFS_OK) {
1812                 /* Free the stateid unless the server explicitly
1813                  * informs us the stateid is unrecognized. */
1814                 if (status != -NFS4ERR_BAD_STATEID)
1815                         nfs41_free_stateid(server, stateid);
1816
1817                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1818                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1819                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1820         }
1821         return status;
1822 }
1823
1824 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1825 {
1826         int status;
1827
1828         nfs41_clear_delegation_stateid(state);
1829         status = nfs41_check_open_stateid(state);
1830         if (status != NFS_OK)
1831                 status = nfs4_open_expired(sp, state);
1832         return status;
1833 }
1834 #endif
1835
1836 /*
1837  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1838  * fields corresponding to attributes that were used to store the verifier.
1839  * Make sure we clobber those fields in the later setattr call
1840  */
1841 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1842 {
1843         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1844             !(sattr->ia_valid & ATTR_ATIME_SET))
1845                 sattr->ia_valid |= ATTR_ATIME;
1846
1847         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1848             !(sattr->ia_valid & ATTR_MTIME_SET))
1849                 sattr->ia_valid |= ATTR_MTIME;
1850 }
1851
1852 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1853                 fmode_t fmode,
1854                 int flags,
1855                 struct nfs4_state **res)
1856 {
1857         struct nfs4_state_owner *sp = opendata->owner;
1858         struct nfs_server *server = sp->so_server;
1859         struct nfs4_state *state;
1860         unsigned int seq;
1861         int ret;
1862
1863         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1864
1865         ret = _nfs4_proc_open(opendata);
1866         if (ret != 0)
1867                 goto out;
1868
1869         state = nfs4_opendata_to_nfs4_state(opendata);
1870         ret = PTR_ERR(state);
1871         if (IS_ERR(state))
1872                 goto out;
1873         if (server->caps & NFS_CAP_POSIX_LOCK)
1874                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1875
1876         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1877         if (ret != 0)
1878                 goto out;
1879
1880         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
1881                 nfs4_schedule_stateid_recovery(server, state);
1882                 nfs4_wait_clnt_recover(server->nfs_client);
1883         }
1884         *res = state;
1885 out:
1886         return ret;
1887 }
1888
1889 /*
1890  * Returns a referenced nfs4_state
1891  */
1892 static int _nfs4_do_open(struct inode *dir,
1893                         struct dentry *dentry,
1894                         fmode_t fmode,
1895                         int flags,
1896                         struct iattr *sattr,
1897                         struct rpc_cred *cred,
1898                         struct nfs4_state **res,
1899                         struct nfs4_threshold **ctx_th)
1900 {
1901         struct nfs4_state_owner  *sp;
1902         struct nfs4_state     *state = NULL;
1903         struct nfs_server       *server = NFS_SERVER(dir);
1904         struct nfs4_opendata *opendata;
1905         int status;
1906
1907         /* Protect against reboot recovery conflicts */
1908         status = -ENOMEM;
1909         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1910         if (sp == NULL) {
1911                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1912                 goto out_err;
1913         }
1914         status = nfs4_recover_expired_lease(server);
1915         if (status != 0)
1916                 goto err_put_state_owner;
1917         if (dentry->d_inode != NULL)
1918                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1919         status = -ENOMEM;
1920         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1921         if (opendata == NULL)
1922                 goto err_put_state_owner;
1923
1924         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1925                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1926                 if (!opendata->f_attr.mdsthreshold)
1927                         goto err_opendata_put;
1928                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1929         }
1930         if (dentry->d_inode != NULL)
1931                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1932
1933         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1934         if (status != 0)
1935                 goto err_opendata_put;
1936
1937         if (opendata->o_arg.open_flags & O_EXCL) {
1938                 nfs4_exclusive_attrset(opendata, sattr);
1939
1940                 nfs_fattr_init(opendata->o_res.f_attr);
1941                 status = nfs4_do_setattr(state->inode, cred,
1942                                 opendata->o_res.f_attr, sattr,
1943                                 state);
1944                 if (status == 0)
1945                         nfs_setattr_update_inode(state->inode, sattr);
1946                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1947         }
1948
1949         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1950                 *ctx_th = opendata->f_attr.mdsthreshold;
1951         else
1952                 kfree(opendata->f_attr.mdsthreshold);
1953         opendata->f_attr.mdsthreshold = NULL;
1954
1955         nfs4_opendata_put(opendata);
1956         nfs4_put_state_owner(sp);
1957         *res = state;
1958         return 0;
1959 err_opendata_put:
1960         kfree(opendata->f_attr.mdsthreshold);
1961         nfs4_opendata_put(opendata);
1962 err_put_state_owner:
1963         nfs4_put_state_owner(sp);
1964 out_err:
1965         *res = NULL;
1966         return status;
1967 }
1968
1969
1970 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1971                                         struct dentry *dentry,
1972                                         fmode_t fmode,
1973                                         int flags,
1974                                         struct iattr *sattr,
1975                                         struct rpc_cred *cred,
1976                                         struct nfs4_threshold **ctx_th)
1977 {
1978         struct nfs4_exception exception = { };
1979         struct nfs4_state *res;
1980         int status;
1981
1982         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1983         do {
1984                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1985                                        &res, ctx_th);
1986                 if (status == 0)
1987                         break;
1988                 /* NOTE: BAD_SEQID means the server and client disagree about the
1989                  * book-keeping w.r.t. state-changing operations
1990                  * (OPEN/CLOSE/LOCK/LOCKU...)
1991                  * It is actually a sign of a bug on the client or on the server.
1992                  *
1993                  * If we receive a BAD_SEQID error in the particular case of
1994                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1995                  * have unhashed the old state_owner for us, and that we can
1996                  * therefore safely retry using a new one. We should still warn
1997                  * the user though...
1998                  */
1999                 if (status == -NFS4ERR_BAD_SEQID) {
2000                         pr_warn_ratelimited("NFS: v4 server %s "
2001                                         " returned a bad sequence-id error!\n",
2002                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2003                         exception.retry = 1;
2004                         continue;
2005                 }
2006                 /*
2007                  * BAD_STATEID on OPEN means that the server cancelled our
2008                  * state before it received the OPEN_CONFIRM.
2009                  * Recover by retrying the request as per the discussion
2010                  * on Page 181 of RFC3530.
2011                  */
2012                 if (status == -NFS4ERR_BAD_STATEID) {
2013                         exception.retry = 1;
2014                         continue;
2015                 }
2016                 if (status == -EAGAIN) {
2017                         /* We must have found a delegation */
2018                         exception.retry = 1;
2019                         continue;
2020                 }
2021                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2022                                         status, &exception));
2023         } while (exception.retry);
2024         return res;
2025 }
2026
2027 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2028                             struct nfs_fattr *fattr, struct iattr *sattr,
2029                             struct nfs4_state *state)
2030 {
2031         struct nfs_server *server = NFS_SERVER(inode);
2032         struct nfs_setattrargs  arg = {
2033                 .fh             = NFS_FH(inode),
2034                 .iap            = sattr,
2035                 .server         = server,
2036                 .bitmask = server->attr_bitmask,
2037         };
2038         struct nfs_setattrres  res = {
2039                 .fattr          = fattr,
2040                 .server         = server,
2041         };
2042         struct rpc_message msg = {
2043                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2044                 .rpc_argp       = &arg,
2045                 .rpc_resp       = &res,
2046                 .rpc_cred       = cred,
2047         };
2048         unsigned long timestamp = jiffies;
2049         int status;
2050
2051         nfs_fattr_init(fattr);
2052
2053         if (state != NULL) {
2054                 struct nfs_lockowner lockowner = {
2055                         .l_owner = current->files,
2056                         .l_pid = current->tgid,
2057                 };
2058                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2059                                 &lockowner);
2060         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2061                                 FMODE_WRITE)) {
2062                 /* Use that stateid */
2063         } else
2064                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2065
2066         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2067         if (status == 0 && state != NULL)
2068                 renew_lease(server, timestamp);
2069         return status;
2070 }
2071
2072 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2073                            struct nfs_fattr *fattr, struct iattr *sattr,
2074                            struct nfs4_state *state)
2075 {
2076         struct nfs_server *server = NFS_SERVER(inode);
2077         struct nfs4_exception exception = {
2078                 .state = state,
2079                 .inode = inode,
2080         };
2081         int err;
2082         do {
2083                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2084                 switch (err) {
2085                 case -NFS4ERR_OPENMODE:
2086                         if (state && !(state->state & FMODE_WRITE)) {
2087                                 err = -EBADF;
2088                                 if (sattr->ia_valid & ATTR_OPEN)
2089                                         err = -EACCES;
2090                                 goto out;
2091                         }
2092                 }
2093                 err = nfs4_handle_exception(server, err, &exception);
2094         } while (exception.retry);
2095 out:
2096         return err;
2097 }
2098
2099 struct nfs4_closedata {
2100         struct inode *inode;
2101         struct nfs4_state *state;
2102         struct nfs_closeargs arg;
2103         struct nfs_closeres res;
2104         struct nfs_fattr fattr;
2105         unsigned long timestamp;
2106         bool roc;
2107         u32 roc_barrier;
2108 };
2109
2110 static void nfs4_free_closedata(void *data)
2111 {
2112         struct nfs4_closedata *calldata = data;
2113         struct nfs4_state_owner *sp = calldata->state->owner;
2114         struct super_block *sb = calldata->state->inode->i_sb;
2115
2116         if (calldata->roc)
2117                 pnfs_roc_release(calldata->state->inode);
2118         nfs4_put_open_state(calldata->state);
2119         nfs_free_seqid(calldata->arg.seqid);
2120         nfs4_put_state_owner(sp);
2121         nfs_sb_deactive(sb);
2122         kfree(calldata);
2123 }
2124
2125 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2126                 fmode_t fmode)
2127 {
2128         spin_lock(&state->owner->so_lock);
2129         if (!(fmode & FMODE_READ))
2130                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2131         if (!(fmode & FMODE_WRITE))
2132                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2133         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2134         spin_unlock(&state->owner->so_lock);
2135 }
2136
2137 static void nfs4_close_done(struct rpc_task *task, void *data)
2138 {
2139         struct nfs4_closedata *calldata = data;
2140         struct nfs4_state *state = calldata->state;
2141         struct nfs_server *server = NFS_SERVER(calldata->inode);
2142
2143         dprintk("%s: begin!\n", __func__);
2144         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2145                 return;
2146         /* hmm. we are done with the inode, and in the process of freeing
2147          * the state_owner. we keep this around to process errors
2148          */
2149         switch (task->tk_status) {
2150                 case 0:
2151                         if (calldata->roc)
2152                                 pnfs_roc_set_barrier(state->inode,
2153                                                      calldata->roc_barrier);
2154                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2155                         renew_lease(server, calldata->timestamp);
2156                         nfs4_close_clear_stateid_flags(state,
2157                                         calldata->arg.fmode);
2158                         break;
2159                 case -NFS4ERR_STALE_STATEID:
2160                 case -NFS4ERR_OLD_STATEID:
2161                 case -NFS4ERR_BAD_STATEID:
2162                 case -NFS4ERR_EXPIRED:
2163                         if (calldata->arg.fmode == 0)
2164                                 break;
2165                 default:
2166                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2167                                 rpc_restart_call_prepare(task);
2168         }
2169         nfs_release_seqid(calldata->arg.seqid);
2170         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2171         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2172 }
2173
2174 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2175 {
2176         struct nfs4_closedata *calldata = data;
2177         struct nfs4_state *state = calldata->state;
2178         struct inode *inode = calldata->inode;
2179         int call_close = 0;
2180
2181         dprintk("%s: begin!\n", __func__);
2182         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2183                 goto out_wait;
2184
2185         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2186         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2187         spin_lock(&state->owner->so_lock);
2188         /* Calculate the change in open mode */
2189         if (state->n_rdwr == 0) {
2190                 if (state->n_rdonly == 0) {
2191                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2192                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2193                         calldata->arg.fmode &= ~FMODE_READ;
2194                 }
2195                 if (state->n_wronly == 0) {
2196                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2197                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2198                         calldata->arg.fmode &= ~FMODE_WRITE;
2199                 }
2200         }
2201         spin_unlock(&state->owner->so_lock);
2202
2203         if (!call_close) {
2204                 /* Note: exit _without_ calling nfs4_close_done */
2205                 goto out_no_action;
2206         }
2207
2208         if (calldata->arg.fmode == 0) {
2209                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2210                 if (calldata->roc &&
2211                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2212                         goto out_wait;
2213         }
2214
2215         nfs_fattr_init(calldata->res.fattr);
2216         calldata->timestamp = jiffies;
2217         if (nfs4_setup_sequence(NFS_SERVER(inode),
2218                                 &calldata->arg.seq_args,
2219                                 &calldata->res.seq_res,
2220                                 task) != 0)
2221                 nfs_release_seqid(calldata->arg.seqid);
2222         dprintk("%s: done!\n", __func__);
2223         return;
2224 out_no_action:
2225         task->tk_action = NULL;
2226 out_wait:
2227         nfs4_sequence_done(task, &calldata->res.seq_res);
2228 }
2229
2230 static const struct rpc_call_ops nfs4_close_ops = {
2231         .rpc_call_prepare = nfs4_close_prepare,
2232         .rpc_call_done = nfs4_close_done,
2233         .rpc_release = nfs4_free_closedata,
2234 };
2235
2236 /*
2237  * It is possible for data to be read/written from a mem-mapped file
2238  * after the sys_close call (which hits the vfs layer as a flush).
2239  * This means that we can't safely call nfsv4 close on a file until
2240  * the inode is cleared. This in turn means that we are not good
2241  * NFSv4 citizens - we do not indicate to the server to update the file's
2242  * share state even when we are done with one of the three share
2243  * stateid's in the inode.
2244  *
2245  * NOTE: Caller must be holding the sp->so_owner semaphore!
2246  */
2247 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2248 {
2249         struct nfs_server *server = NFS_SERVER(state->inode);
2250         struct nfs4_closedata *calldata;
2251         struct nfs4_state_owner *sp = state->owner;
2252         struct rpc_task *task;
2253         struct rpc_message msg = {
2254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2255                 .rpc_cred = state->owner->so_cred,
2256         };
2257         struct rpc_task_setup task_setup_data = {
2258                 .rpc_client = server->client,
2259                 .rpc_message = &msg,
2260                 .callback_ops = &nfs4_close_ops,
2261                 .workqueue = nfsiod_workqueue,
2262                 .flags = RPC_TASK_ASYNC,
2263         };
2264         int status = -ENOMEM;
2265
2266         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2267         if (calldata == NULL)
2268                 goto out;
2269         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2270         calldata->inode = state->inode;
2271         calldata->state = state;
2272         calldata->arg.fh = NFS_FH(state->inode);
2273         calldata->arg.stateid = &state->open_stateid;
2274         /* Serialization for the sequence id */
2275         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2276         if (calldata->arg.seqid == NULL)
2277                 goto out_free_calldata;
2278         calldata->arg.fmode = 0;
2279         calldata->arg.bitmask = server->cache_consistency_bitmask;
2280         calldata->res.fattr = &calldata->fattr;
2281         calldata->res.seqid = calldata->arg.seqid;
2282         calldata->res.server = server;
2283         calldata->roc = pnfs_roc(state->inode);
2284         nfs_sb_active(calldata->inode->i_sb);
2285
2286         msg.rpc_argp = &calldata->arg;
2287         msg.rpc_resp = &calldata->res;
2288         task_setup_data.callback_data = calldata;
2289         task = rpc_run_task(&task_setup_data);
2290         if (IS_ERR(task))
2291                 return PTR_ERR(task);
2292         status = 0;
2293         if (wait)
2294                 status = rpc_wait_for_completion_task(task);
2295         rpc_put_task(task);
2296         return status;
2297 out_free_calldata:
2298         kfree(calldata);
2299 out:
2300         nfs4_put_open_state(state);
2301         nfs4_put_state_owner(sp);
2302         return status;
2303 }
2304
2305 static struct inode *
2306 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2307 {
2308         struct nfs4_state *state;
2309
2310         /* Protect against concurrent sillydeletes */
2311         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2312                              ctx->cred, &ctx->mdsthreshold);
2313         if (IS_ERR(state))
2314                 return ERR_CAST(state);
2315         ctx->state = state;
2316         return igrab(state->inode);
2317 }
2318
2319 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2320 {
2321         if (ctx->state == NULL)
2322                 return;
2323         if (is_sync)
2324                 nfs4_close_sync(ctx->state, ctx->mode);
2325         else
2326                 nfs4_close_state(ctx->state, ctx->mode);
2327 }
2328
2329 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2330 {
2331         struct nfs4_server_caps_arg args = {
2332                 .fhandle = fhandle,
2333         };
2334         struct nfs4_server_caps_res res = {};
2335         struct rpc_message msg = {
2336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2337                 .rpc_argp = &args,
2338                 .rpc_resp = &res,
2339         };
2340         int status;
2341
2342         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2343         if (status == 0) {
2344                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2345                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2346                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2347                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2348                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2349                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2350                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2351                         server->caps |= NFS_CAP_ACLS;
2352                 if (res.has_links != 0)
2353                         server->caps |= NFS_CAP_HARDLINKS;
2354                 if (res.has_symlinks != 0)
2355                         server->caps |= NFS_CAP_SYMLINKS;
2356                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2357                         server->caps |= NFS_CAP_FILEID;
2358                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2359                         server->caps |= NFS_CAP_MODE;
2360                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2361                         server->caps |= NFS_CAP_NLINK;
2362                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2363                         server->caps |= NFS_CAP_OWNER;
2364                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2365                         server->caps |= NFS_CAP_OWNER_GROUP;
2366                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2367                         server->caps |= NFS_CAP_ATIME;
2368                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2369                         server->caps |= NFS_CAP_CTIME;
2370                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2371                         server->caps |= NFS_CAP_MTIME;
2372
2373                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2374                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2375                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2376                 server->acl_bitmask = res.acl_bitmask;
2377                 server->fh_expire_type = res.fh_expire_type;
2378         }
2379
2380         return status;
2381 }
2382
2383 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2384 {
2385         struct nfs4_exception exception = { };
2386         int err;
2387         do {
2388                 err = nfs4_handle_exception(server,
2389                                 _nfs4_server_capabilities(server, fhandle),
2390                                 &exception);
2391         } while (exception.retry);
2392         return err;
2393 }
2394
2395 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2396                 struct nfs_fsinfo *info)
2397 {
2398         struct nfs4_lookup_root_arg args = {
2399                 .bitmask = nfs4_fattr_bitmap,
2400         };
2401         struct nfs4_lookup_res res = {
2402                 .server = server,
2403                 .fattr = info->fattr,
2404                 .fh = fhandle,
2405         };
2406         struct rpc_message msg = {
2407                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2408                 .rpc_argp = &args,
2409                 .rpc_resp = &res,
2410         };
2411
2412         nfs_fattr_init(info->fattr);
2413         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2414 }
2415
2416 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2417                 struct nfs_fsinfo *info)
2418 {
2419         struct nfs4_exception exception = { };
2420         int err;
2421         do {
2422                 err = _nfs4_lookup_root(server, fhandle, info);
2423                 switch (err) {
2424                 case 0:
2425                 case -NFS4ERR_WRONGSEC:
2426                         goto out;
2427                 default:
2428                         err = nfs4_handle_exception(server, err, &exception);
2429                 }
2430         } while (exception.retry);
2431 out:
2432         return err;
2433 }
2434
2435 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2436                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2437 {
2438         struct rpc_auth *auth;
2439         int ret;
2440
2441         auth = rpcauth_create(flavor, server->client);
2442         if (IS_ERR(auth)) {
2443                 ret = -EIO;
2444                 goto out;
2445         }
2446         ret = nfs4_lookup_root(server, fhandle, info);
2447 out:
2448         return ret;
2449 }
2450
2451 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2452                               struct nfs_fsinfo *info)
2453 {
2454         int i, len, status = 0;
2455         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2456
2457         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2458         if (len < 0)
2459                 return len;
2460
2461         for (i = 0; i < len; i++) {
2462                 /* AUTH_UNIX is the default flavor if none was specified,
2463                  * thus has already been tried. */
2464                 if (flav_array[i] == RPC_AUTH_UNIX)
2465                         continue;
2466
2467                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2468                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2469                         continue;
2470                 break;
2471         }
2472         /*
2473          * -EACCESS could mean that the user doesn't have correct permissions
2474          * to access the mount.  It could also mean that we tried to mount
2475          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2476          * existing mount programs don't handle -EACCES very well so it should
2477          * be mapped to -EPERM instead.
2478          */
2479         if (status == -EACCES)
2480                 status = -EPERM;
2481         return status;
2482 }
2483
2484 /*
2485  * get the file handle for the "/" directory on the server
2486  */
2487 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2488                          struct nfs_fsinfo *info)
2489 {
2490         int minor_version = server->nfs_client->cl_minorversion;
2491         int status = nfs4_lookup_root(server, fhandle, info);
2492         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2493                 /*
2494                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2495                  * by nfs4_map_errors() as this function exits.
2496                  */
2497                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2498         if (status == 0)
2499                 status = nfs4_server_capabilities(server, fhandle);
2500         if (status == 0)
2501                 status = nfs4_do_fsinfo(server, fhandle, info);
2502         return nfs4_map_errors(status);
2503 }
2504
2505 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2506                               struct nfs_fsinfo *info)
2507 {
2508         int error;
2509         struct nfs_fattr *fattr = info->fattr;
2510
2511         error = nfs4_server_capabilities(server, mntfh);
2512         if (error < 0) {
2513                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2514                 return error;
2515         }
2516
2517         error = nfs4_proc_getattr(server, mntfh, fattr);
2518         if (error < 0) {
2519                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2520                 return error;
2521         }
2522
2523         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2524             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2525                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2526
2527         return error;
2528 }
2529
2530 /*
2531  * Get locations and (maybe) other attributes of a referral.
2532  * Note that we'll actually follow the referral later when
2533  * we detect fsid mismatch in inode revalidation
2534  */
2535 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2536                              const struct qstr *name, struct nfs_fattr *fattr,
2537                              struct nfs_fh *fhandle)
2538 {
2539         int status = -ENOMEM;
2540         struct page *page = NULL;
2541         struct nfs4_fs_locations *locations = NULL;
2542
2543         page = alloc_page(GFP_KERNEL);
2544         if (page == NULL)
2545                 goto out;
2546         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2547         if (locations == NULL)
2548                 goto out;
2549
2550         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2551         if (status != 0)
2552                 goto out;
2553         /* Make sure server returned a different fsid for the referral */
2554         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2555                 dprintk("%s: server did not return a different fsid for"
2556                         " a referral at %s\n", __func__, name->name);
2557                 status = -EIO;
2558                 goto out;
2559         }
2560         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2561         nfs_fixup_referral_attributes(&locations->fattr);
2562
2563         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2564         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2565         memset(fhandle, 0, sizeof(struct nfs_fh));
2566 out:
2567         if (page)
2568                 __free_page(page);
2569         kfree(locations);
2570         return status;
2571 }
2572
2573 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2574 {
2575         struct nfs4_getattr_arg args = {
2576                 .fh = fhandle,
2577                 .bitmask = server->attr_bitmask,
2578         };
2579         struct nfs4_getattr_res res = {
2580                 .fattr = fattr,
2581                 .server = server,
2582         };
2583         struct rpc_message msg = {
2584                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2585                 .rpc_argp = &args,
2586                 .rpc_resp = &res,
2587         };
2588
2589         nfs_fattr_init(fattr);
2590         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2591 }
2592
2593 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2594 {
2595         struct nfs4_exception exception = { };
2596         int err;
2597         do {
2598                 err = nfs4_handle_exception(server,
2599                                 _nfs4_proc_getattr(server, fhandle, fattr),
2600                                 &exception);
2601         } while (exception.retry);
2602         return err;
2603 }
2604
2605 /*
2606  * The file is not closed if it is opened due to the a request to change
2607  * the size of the file. The open call will not be needed once the
2608  * VFS layer lookup-intents are implemented.
2609  *
2610  * Close is called when the inode is destroyed.
2611  * If we haven't opened the file for O_WRONLY, we
2612  * need to in the size_change case to obtain a stateid.
2613  *
2614  * Got race?
2615  * Because OPEN is always done by name in nfsv4, it is
2616  * possible that we opened a different file by the same
2617  * name.  We can recognize this race condition, but we
2618  * can't do anything about it besides returning an error.
2619  *
2620  * This will be fixed with VFS changes (lookup-intent).
2621  */
2622 static int
2623 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2624                   struct iattr *sattr)
2625 {
2626         struct inode *inode = dentry->d_inode;
2627         struct rpc_cred *cred = NULL;
2628         struct nfs4_state *state = NULL;
2629         int status;
2630
2631         if (pnfs_ld_layoutret_on_setattr(inode))
2632                 pnfs_return_layout(inode);
2633
2634         nfs_fattr_init(fattr);
2635
2636         /* Deal with open(O_TRUNC) */
2637         if (sattr->ia_valid & ATTR_OPEN)
2638                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2639
2640         /* Optimization: if the end result is no change, don't RPC */
2641         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2642                 return 0;
2643
2644         /* Search for an existing open(O_WRITE) file */
2645         if (sattr->ia_valid & ATTR_FILE) {
2646                 struct nfs_open_context *ctx;
2647
2648                 ctx = nfs_file_open_context(sattr->ia_file);
2649                 if (ctx) {
2650                         cred = ctx->cred;
2651                         state = ctx->state;
2652                 }
2653         }
2654
2655         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2656         if (status == 0)
2657                 nfs_setattr_update_inode(inode, sattr);
2658         return status;
2659 }
2660
2661 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2662                 const struct qstr *name, struct nfs_fh *fhandle,
2663                 struct nfs_fattr *fattr)
2664 {
2665         struct nfs_server *server = NFS_SERVER(dir);
2666         int                    status;
2667         struct nfs4_lookup_arg args = {
2668                 .bitmask = server->attr_bitmask,
2669                 .dir_fh = NFS_FH(dir),
2670                 .name = name,
2671         };
2672         struct nfs4_lookup_res res = {
2673                 .server = server,
2674                 .fattr = fattr,
2675                 .fh = fhandle,
2676         };
2677         struct rpc_message msg = {
2678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2679                 .rpc_argp = &args,
2680                 .rpc_resp = &res,
2681         };
2682
2683         nfs_fattr_init(fattr);
2684
2685         dprintk("NFS call  lookup %s\n", name->name);
2686         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2687         dprintk("NFS reply lookup: %d\n", status);
2688         return status;
2689 }
2690
2691 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2692 {
2693         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2694                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2695         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2696         fattr->nlink = 2;
2697 }
2698
2699 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2700                                    struct qstr *name, struct nfs_fh *fhandle,
2701                                    struct nfs_fattr *fattr)
2702 {
2703         struct nfs4_exception exception = { };
2704         struct rpc_clnt *client = *clnt;
2705         int err;
2706         do {
2707                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2708                 switch (err) {
2709                 case -NFS4ERR_BADNAME:
2710                         err = -ENOENT;
2711                         goto out;
2712                 case -NFS4ERR_MOVED:
2713                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2714                         goto out;
2715                 case -NFS4ERR_WRONGSEC:
2716                         err = -EPERM;
2717                         if (client != *clnt)
2718                                 goto out;
2719
2720                         client = nfs4_create_sec_client(client, dir, name);
2721                         if (IS_ERR(client))
2722                                 return PTR_ERR(client);
2723
2724                         exception.retry = 1;
2725                         break;
2726                 default:
2727                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2728                 }
2729         } while (exception.retry);
2730
2731 out:
2732         if (err == 0)
2733                 *clnt = client;
2734         else if (client != *clnt)
2735                 rpc_shutdown_client(client);
2736
2737         return err;
2738 }
2739
2740 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2741                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2742 {
2743         int status;
2744         struct rpc_clnt *client = NFS_CLIENT(dir);
2745
2746         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2747         if (client != NFS_CLIENT(dir)) {
2748                 rpc_shutdown_client(client);
2749                 nfs_fixup_secinfo_attributes(fattr);
2750         }
2751         return status;
2752 }
2753
2754 struct rpc_clnt *
2755 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2756                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2757 {
2758         int status;
2759         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2760
2761         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2762         if (status < 0) {
2763                 rpc_shutdown_client(client);
2764                 return ERR_PTR(status);
2765         }
2766         return client;
2767 }
2768
2769 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2770 {
2771         struct nfs_server *server = NFS_SERVER(inode);
2772         struct nfs4_accessargs args = {
2773                 .fh = NFS_FH(inode),
2774                 .bitmask = server->cache_consistency_bitmask,
2775         };
2776         struct nfs4_accessres res = {
2777                 .server = server,
2778         };
2779         struct rpc_message msg = {
2780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2781                 .rpc_argp = &args,
2782                 .rpc_resp = &res,
2783                 .rpc_cred = entry->cred,
2784         };
2785         int mode = entry->mask;
2786         int status;
2787
2788         /*
2789          * Determine which access bits we want to ask for...
2790          */
2791         if (mode & MAY_READ)
2792                 args.access |= NFS4_ACCESS_READ;
2793         if (S_ISDIR(inode->i_mode)) {
2794                 if (mode & MAY_WRITE)
2795                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2796                 if (mode & MAY_EXEC)
2797                         args.access |= NFS4_ACCESS_LOOKUP;
2798         } else {
2799                 if (mode & MAY_WRITE)
2800                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2801                 if (mode & MAY_EXEC)
2802                         args.access |= NFS4_ACCESS_EXECUTE;
2803         }
2804
2805         res.fattr = nfs_alloc_fattr();
2806         if (res.fattr == NULL)
2807                 return -ENOMEM;
2808
2809         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2810         if (!status) {
2811                 nfs_access_set_mask(entry, res.access);
2812                 nfs_refresh_inode(inode, res.fattr);
2813         }
2814         nfs_free_fattr(res.fattr);
2815         return status;
2816 }
2817
2818 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2819 {
2820         struct nfs4_exception exception = { };
2821         int err;
2822         do {
2823                 err = nfs4_handle_exception(NFS_SERVER(inode),
2824                                 _nfs4_proc_access(inode, entry),
2825                                 &exception);
2826         } while (exception.retry);
2827         return err;
2828 }
2829
2830 /*
2831  * TODO: For the time being, we don't try to get any attributes
2832  * along with any of the zero-copy operations READ, READDIR,
2833  * READLINK, WRITE.
2834  *
2835  * In the case of the first three, we want to put the GETATTR
2836  * after the read-type operation -- this is because it is hard
2837  * to predict the length of a GETATTR response in v4, and thus
2838  * align the READ data correctly.  This means that the GETATTR
2839  * may end up partially falling into the page cache, and we should
2840  * shift it into the 'tail' of the xdr_buf before processing.
2841  * To do this efficiently, we need to know the total length
2842  * of data received, which doesn't seem to be available outside
2843  * of the RPC layer.
2844  *
2845  * In the case of WRITE, we also want to put the GETATTR after
2846  * the operation -- in this case because we want to make sure
2847  * we get the post-operation mtime and size.
2848  *
2849  * Both of these changes to the XDR layer would in fact be quite
2850  * minor, but I decided to leave them for a subsequent patch.
2851  */
2852 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2853                 unsigned int pgbase, unsigned int pglen)
2854 {
2855         struct nfs4_readlink args = {
2856                 .fh       = NFS_FH(inode),
2857                 .pgbase   = pgbase,
2858                 .pglen    = pglen,
2859                 .pages    = &page,
2860         };
2861         struct nfs4_readlink_res res;
2862         struct rpc_message msg = {
2863                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2864                 .rpc_argp = &args,
2865                 .rpc_resp = &res,
2866         };
2867
2868         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2869 }
2870
2871 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2872                 unsigned int pgbase, unsigned int pglen)
2873 {
2874         struct nfs4_exception exception = { };
2875         int err;
2876         do {
2877                 err = nfs4_handle_exception(NFS_SERVER(inode),
2878                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2879                                 &exception);
2880         } while (exception.retry);
2881         return err;
2882 }
2883
2884 /*
2885  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2886  */
2887 static int
2888 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2889                  int flags)
2890 {
2891         struct nfs_open_context *ctx;
2892         struct nfs4_state *state;
2893         int status = 0;
2894
2895         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2896         if (IS_ERR(ctx))
2897                 return PTR_ERR(ctx);
2898
2899         sattr->ia_mode &= ~current_umask();
2900         state = nfs4_do_open(dir, dentry, ctx->mode,
2901                         flags, sattr, ctx->cred,
2902                         &ctx->mdsthreshold);
2903         d_drop(dentry);
2904         if (IS_ERR(state)) {
2905                 status = PTR_ERR(state);
2906                 goto out;
2907         }
2908         d_add(dentry, igrab(state->inode));
2909         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2910         ctx->state = state;
2911 out:
2912         put_nfs_open_context(ctx);
2913         return status;
2914 }
2915
2916 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2917 {
2918         struct nfs_server *server = NFS_SERVER(dir);
2919         struct nfs_removeargs args = {
2920                 .fh = NFS_FH(dir),
2921                 .name = *name,
2922         };
2923         struct nfs_removeres res = {
2924                 .server = server,
2925         };
2926         struct rpc_message msg = {
2927                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2928                 .rpc_argp = &args,
2929                 .rpc_resp = &res,
2930         };
2931         int status;
2932
2933         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2934         if (status == 0)
2935                 update_changeattr(dir, &res.cinfo);
2936         return status;
2937 }
2938
2939 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2940 {
2941         struct nfs4_exception exception = { };
2942         int err;
2943         do {
2944                 err = nfs4_handle_exception(NFS_SERVER(dir),
2945                                 _nfs4_proc_remove(dir, name),
2946                                 &exception);
2947         } while (exception.retry);
2948         return err;
2949 }
2950
2951 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2952 {
2953         struct nfs_server *server = NFS_SERVER(dir);
2954         struct nfs_removeargs *args = msg->rpc_argp;
2955         struct nfs_removeres *res = msg->rpc_resp;
2956
2957         res->server = server;
2958         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2959         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2960 }
2961
2962 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2963 {
2964         nfs4_setup_sequence(NFS_SERVER(data->dir),
2965                         &data->args.seq_args,
2966                         &data->res.seq_res,
2967                         task);
2968 }
2969
2970 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2971 {
2972         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2973
2974         if (!nfs4_sequence_done(task, &res->seq_res))
2975                 return 0;
2976         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2977                 return 0;
2978         update_changeattr(dir, &res->cinfo);
2979         return 1;
2980 }
2981
2982 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2983 {
2984         struct nfs_server *server = NFS_SERVER(dir);
2985         struct nfs_renameargs *arg = msg->rpc_argp;
2986         struct nfs_renameres *res = msg->rpc_resp;
2987
2988         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2989         res->server = server;
2990         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2991 }
2992
2993 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2994 {
2995         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2996                         &data->args.seq_args,
2997                         &data->res.seq_res,
2998                         task);
2999 }
3000
3001 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3002                                  struct inode *new_dir)
3003 {
3004         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3005
3006         if (!nfs4_sequence_done(task, &res->seq_res))
3007                 return 0;
3008         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3009                 return 0;
3010
3011         update_changeattr(old_dir, &res->old_cinfo);
3012         update_changeattr(new_dir, &res->new_cinfo);
3013         return 1;
3014 }
3015
3016 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3017                 struct inode *new_dir, struct qstr *new_name)
3018 {
3019         struct nfs_server *server = NFS_SERVER(old_dir);
3020         struct nfs_renameargs arg = {
3021                 .old_dir = NFS_FH(old_dir),
3022                 .new_dir = NFS_FH(new_dir),
3023                 .old_name = old_name,
3024                 .new_name = new_name,
3025         };
3026         struct nfs_renameres res = {
3027                 .server = server,
3028         };
3029         struct rpc_message msg = {
3030                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3031                 .rpc_argp = &arg,
3032                 .rpc_resp = &res,
3033         };
3034         int status = -ENOMEM;
3035
3036         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3037         if (!status) {
3038                 update_changeattr(old_dir, &res.old_cinfo);
3039                 update_changeattr(new_dir, &res.new_cinfo);
3040         }
3041         return status;
3042 }
3043
3044 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3045                 struct inode *new_dir, struct qstr *new_name)
3046 {
3047         struct nfs4_exception exception = { };
3048         int err;
3049         do {
3050                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3051                                 _nfs4_proc_rename(old_dir, old_name,
3052                                         new_dir, new_name),
3053                                 &exception);
3054         } while (exception.retry);
3055         return err;
3056 }
3057
3058 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3059 {
3060         struct nfs_server *server = NFS_SERVER(inode);
3061         struct nfs4_link_arg arg = {
3062                 .fh     = NFS_FH(inode),
3063                 .dir_fh = NFS_FH(dir),
3064                 .name   = name,
3065                 .bitmask = server->attr_bitmask,
3066         };
3067         struct nfs4_link_res res = {
3068                 .server = server,
3069         };
3070         struct rpc_message msg = {
3071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3072                 .rpc_argp = &arg,
3073                 .rpc_resp = &res,
3074         };
3075         int status = -ENOMEM;
3076
3077         res.fattr = nfs_alloc_fattr();
3078         if (res.fattr == NULL)
3079                 goto out;
3080
3081         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3082         if (!status) {
3083                 update_changeattr(dir, &res.cinfo);
3084                 nfs_post_op_update_inode(inode, res.fattr);
3085         }
3086 out:
3087         nfs_free_fattr(res.fattr);
3088         return status;
3089 }
3090
3091 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3092 {
3093         struct nfs4_exception exception = { };
3094         int err;
3095         do {
3096                 err = nfs4_handle_exception(NFS_SERVER(inode),
3097                                 _nfs4_proc_link(inode, dir, name),
3098                                 &exception);
3099         } while (exception.retry);
3100         return err;
3101 }
3102
3103 struct nfs4_createdata {
3104         struct rpc_message msg;
3105         struct nfs4_create_arg arg;
3106         struct nfs4_create_res res;
3107         struct nfs_fh fh;
3108         struct nfs_fattr fattr;
3109 };
3110
3111 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3112                 struct qstr *name, struct iattr *sattr, u32 ftype)
3113 {
3114         struct nfs4_createdata *data;
3115
3116         data = kzalloc(sizeof(*data), GFP_KERNEL);
3117         if (data != NULL) {
3118                 struct nfs_server *server = NFS_SERVER(dir);
3119
3120                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3121                 data->msg.rpc_argp = &data->arg;
3122                 data->msg.rpc_resp = &data->res;
3123                 data->arg.dir_fh = NFS_FH(dir);
3124                 data->arg.server = server;
3125                 data->arg.name = name;
3126                 data->arg.attrs = sattr;
3127                 data->arg.ftype = ftype;
3128                 data->arg.bitmask = server->attr_bitmask;
3129                 data->res.server = server;
3130                 data->res.fh = &data->fh;
3131                 data->res.fattr = &data->fattr;
3132                 nfs_fattr_init(data->res.fattr);
3133         }
3134         return data;
3135 }
3136
3137 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3138 {
3139         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3140                                     &data->arg.seq_args, &data->res.seq_res, 1);
3141         if (status == 0) {
3142                 update_changeattr(dir, &data->res.dir_cinfo);
3143                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3144         }
3145         return status;
3146 }
3147
3148 static void nfs4_free_createdata(struct nfs4_createdata *data)
3149 {
3150         kfree(data);
3151 }
3152
3153 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3154                 struct page *page, unsigned int len, struct iattr *sattr)
3155 {
3156         struct nfs4_createdata *data;
3157         int status = -ENAMETOOLONG;
3158
3159         if (len > NFS4_MAXPATHLEN)
3160                 goto out;
3161
3162         status = -ENOMEM;
3163         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3164         if (data == NULL)
3165                 goto out;
3166
3167         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3168         data->arg.u.symlink.pages = &page;
3169         data->arg.u.symlink.len = len;
3170
3171         status = nfs4_do_create(dir, dentry, data);
3172
3173         nfs4_free_createdata(data);
3174 out:
3175         return status;
3176 }
3177
3178 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3179                 struct page *page, unsigned int len, struct iattr *sattr)
3180 {
3181         struct nfs4_exception exception = { };
3182         int err;
3183         do {
3184                 err = nfs4_handle_exception(NFS_SERVER(dir),
3185                                 _nfs4_proc_symlink(dir, dentry, page,
3186                                                         len, sattr),
3187                                 &exception);
3188         } while (exception.retry);
3189         return err;
3190 }
3191
3192 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3193                 struct iattr *sattr)
3194 {
3195         struct nfs4_createdata *data;
3196         int status = -ENOMEM;
3197
3198         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3199         if (data == NULL)
3200                 goto out;
3201
3202         status = nfs4_do_create(dir, dentry, data);
3203
3204         nfs4_free_createdata(data);
3205 out:
3206         return status;
3207 }
3208
3209 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3210                 struct iattr *sattr)
3211 {
3212         struct nfs4_exception exception = { };
3213         int err;
3214
3215         sattr->ia_mode &= ~current_umask();
3216         do {
3217                 err = nfs4_handle_exception(NFS_SERVER(dir),
3218                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3219                                 &exception);
3220         } while (exception.retry);
3221         return err;
3222 }
3223
3224 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3225                 u64 cookie, struct page **pages, unsigned int count, int plus)
3226 {
3227         struct inode            *dir = dentry->d_inode;
3228         struct nfs4_readdir_arg args = {
3229                 .fh = NFS_FH(dir),
3230                 .pages = pages,
3231                 .pgbase = 0,
3232                 .count = count,
3233                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3234                 .plus = plus,
3235         };
3236         struct nfs4_readdir_res res;
3237         struct rpc_message msg = {
3238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3239                 .rpc_argp = &args,
3240                 .rpc_resp = &res,
3241                 .rpc_cred = cred,
3242         };
3243         int                     status;
3244
3245         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3246                         dentry->d_parent->d_name.name,
3247                         dentry->d_name.name,
3248                         (unsigned long long)cookie);
3249         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3250         res.pgbase = args.pgbase;
3251         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3252         if (status >= 0) {
3253                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3254                 status += args.pgbase;
3255         }
3256
3257         nfs_invalidate_atime(dir);
3258
3259         dprintk("%s: returns %d\n", __func__, status);
3260         return status;
3261 }
3262
3263 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3264                 u64 cookie, struct page **pages, unsigned int count, int plus)
3265 {
3266         struct nfs4_exception exception = { };
3267         int err;
3268         do {
3269                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3270                                 _nfs4_proc_readdir(dentry, cred, cookie,
3271                                         pages, count, plus),
3272                                 &exception);
3273         } while (exception.retry);
3274         return err;
3275 }
3276
3277 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3278                 struct iattr *sattr, dev_t rdev)
3279 {
3280         struct nfs4_createdata *data;
3281         int mode = sattr->ia_mode;
3282         int status = -ENOMEM;
3283
3284         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3285         if (data == NULL)
3286                 goto out;
3287
3288         if (S_ISFIFO(mode))
3289                 data->arg.ftype = NF4FIFO;
3290         else if (S_ISBLK(mode)) {
3291                 data->arg.ftype = NF4BLK;
3292                 data->arg.u.device.specdata1 = MAJOR(rdev);
3293                 data->arg.u.device.specdata2 = MINOR(rdev);
3294         }
3295         else if (S_ISCHR(mode)) {
3296                 data->arg.ftype = NF4CHR;
3297                 data->arg.u.device.specdata1 = MAJOR(rdev);
3298                 data->arg.u.device.specdata2 = MINOR(rdev);
3299         } else if (!S_ISSOCK(mode)) {
3300                 status = -EINVAL;
3301                 goto out_free;
3302         }
3303
3304         status = nfs4_do_create(dir, dentry, data);
3305 out_free:
3306         nfs4_free_createdata(data);
3307 out:
3308         return status;
3309 }
3310
3311 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3312                 struct iattr *sattr, dev_t rdev)
3313 {
3314         struct nfs4_exception exception = { };
3315         int err;
3316
3317         sattr->ia_mode &= ~current_umask();
3318         do {
3319                 err = nfs4_handle_exception(NFS_SERVER(dir),
3320                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3321                                 &exception);
3322         } while (exception.retry);
3323         return err;
3324 }
3325
3326 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3327                  struct nfs_fsstat *fsstat)
3328 {
3329         struct nfs4_statfs_arg args = {
3330                 .fh = fhandle,
3331                 .bitmask = server->attr_bitmask,
3332         };
3333         struct nfs4_statfs_res res = {
3334                 .fsstat = fsstat,
3335         };
3336         struct rpc_message msg = {
3337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3338                 .rpc_argp = &args,
3339                 .rpc_resp = &res,
3340         };
3341
3342         nfs_fattr_init(fsstat->fattr);
3343         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3344 }
3345
3346 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3347 {
3348         struct nfs4_exception exception = { };
3349         int err;
3350         do {
3351                 err = nfs4_handle_exception(server,
3352                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3353                                 &exception);
3354         } while (exception.retry);
3355         return err;
3356 }
3357
3358 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3359                 struct nfs_fsinfo *fsinfo)
3360 {
3361         struct nfs4_fsinfo_arg args = {
3362                 .fh = fhandle,
3363                 .bitmask = server->attr_bitmask,
3364         };
3365         struct nfs4_fsinfo_res res = {
3366                 .fsinfo = fsinfo,
3367         };
3368         struct rpc_message msg = {
3369                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3370                 .rpc_argp = &args,
3371                 .rpc_resp = &res,
3372         };
3373
3374         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3375 }
3376
3377 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3378 {
3379         struct nfs4_exception exception = { };
3380         int err;
3381
3382         do {
3383                 err = nfs4_handle_exception(server,
3384                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3385                                 &exception);
3386         } while (exception.retry);
3387         return err;
3388 }
3389
3390 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3391 {
3392         int error;
3393
3394         nfs_fattr_init(fsinfo->fattr);
3395         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3396         if (error == 0) {
3397                 /* block layout checks this! */
3398                 server->pnfs_blksize = fsinfo->blksize;
3399                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3400         }
3401
3402         return error;
3403 }
3404
3405 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3406                 struct nfs_pathconf *pathconf)
3407 {
3408         struct nfs4_pathconf_arg args = {
3409                 .fh = fhandle,
3410                 .bitmask = server->attr_bitmask,
3411         };
3412         struct nfs4_pathconf_res res = {
3413                 .pathconf = pathconf,
3414         };
3415         struct rpc_message msg = {
3416                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3417                 .rpc_argp = &args,
3418                 .rpc_resp = &res,
3419         };
3420
3421         /* None of the pathconf attributes are mandatory to implement */
3422         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3423                 memset(pathconf, 0, sizeof(*pathconf));
3424                 return 0;
3425         }
3426
3427         nfs_fattr_init(pathconf->fattr);
3428         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3429 }
3430
3431 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3432                 struct nfs_pathconf *pathconf)
3433 {
3434         struct nfs4_exception exception = { };
3435         int err;
3436
3437         do {
3438                 err = nfs4_handle_exception(server,
3439                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3440                                 &exception);
3441         } while (exception.retry);
3442         return err;
3443 }
3444
3445 void __nfs4_read_done_cb(struct nfs_read_data *data)
3446 {
3447         nfs_invalidate_atime(data->header->inode);
3448 }
3449
3450 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3451 {
3452         struct nfs_server *server = NFS_SERVER(data->header->inode);
3453
3454         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3455                 rpc_restart_call_prepare(task);
3456                 return -EAGAIN;
3457         }
3458
3459         __nfs4_read_done_cb(data);
3460         if (task->tk_status > 0)
3461                 renew_lease(server, data->timestamp);
3462         return 0;
3463 }
3464
3465 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3466 {
3467
3468         dprintk("--> %s\n", __func__);
3469
3470         if (!nfs4_sequence_done(task, &data->res.seq_res))
3471                 return -EAGAIN;
3472
3473         return data->read_done_cb ? data->read_done_cb(task, data) :
3474                                     nfs4_read_done_cb(task, data);
3475 }
3476
3477 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3478 {
3479         data->timestamp   = jiffies;
3480         data->read_done_cb = nfs4_read_done_cb;
3481         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3482         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3483 }
3484
3485 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3486 {
3487         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3488                         &data->args.seq_args,
3489                         &data->res.seq_res,
3490                         task);
3491 }
3492
3493 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3494 {
3495         struct inode *inode = data->header->inode;
3496
3497         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3498                 rpc_restart_call_prepare(task);
3499                 return -EAGAIN;
3500         }
3501         if (task->tk_status >= 0) {
3502                 renew_lease(NFS_SERVER(inode), data->timestamp);
3503                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3504         }
3505         return 0;
3506 }
3507
3508 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3509 {
3510         if (!nfs4_sequence_done(task, &data->res.seq_res))
3511                 return -EAGAIN;
3512         return data->write_done_cb ? data->write_done_cb(task, data) :
3513                 nfs4_write_done_cb(task, data);
3514 }
3515
3516 static
3517 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3518 {
3519         const struct nfs_pgio_header *hdr = data->header;
3520
3521         /* Don't request attributes for pNFS or O_DIRECT writes */
3522         if (data->ds_clp != NULL || hdr->dreq != NULL)
3523                 return false;
3524         /* Otherwise, request attributes if and only if we don't hold
3525          * a delegation
3526          */
3527         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3528 }
3529
3530 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3531 {
3532         struct nfs_server *server = NFS_SERVER(data->header->inode);
3533
3534         if (!nfs4_write_need_cache_consistency_data(data)) {
3535                 data->args.bitmask = NULL;
3536                 data->res.fattr = NULL;
3537         } else
3538                 data->args.bitmask = server->cache_consistency_bitmask;
3539
3540         if (!data->write_done_cb)
3541                 data->write_done_cb = nfs4_write_done_cb;
3542         data->res.server = server;
3543         data->timestamp   = jiffies;
3544
3545         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3546         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3547 }
3548
3549 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3550 {
3551         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3552                         &data->args.seq_args,
3553                         &data->res.seq_res,
3554                         task);
3555 }
3556
3557 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3558 {
3559         nfs4_setup_sequence(NFS_SERVER(data->inode),
3560                         &data->args.seq_args,
3561                         &data->res.seq_res,
3562                         task);
3563 }
3564
3565 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3566 {
3567         struct inode *inode = data->inode;
3568
3569         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3570                 rpc_restart_call_prepare(task);
3571                 return -EAGAIN;
3572         }
3573         return 0;
3574 }
3575
3576 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3577 {
3578         if (!nfs4_sequence_done(task, &data->res.seq_res))
3579                 return -EAGAIN;
3580         return data->commit_done_cb(task, data);
3581 }
3582
3583 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3584 {
3585         struct nfs_server *server = NFS_SERVER(data->inode);
3586
3587         if (data->commit_done_cb == NULL)
3588                 data->commit_done_cb = nfs4_commit_done_cb;
3589         data->res.server = server;
3590         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3591         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3592 }
3593
3594 struct nfs4_renewdata {
3595         struct nfs_client       *client;
3596         unsigned long           timestamp;
3597 };
3598
3599 /*
3600  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3601  * standalone procedure for queueing an asynchronous RENEW.
3602  */
3603 static void nfs4_renew_release(void *calldata)
3604 {
3605         struct nfs4_renewdata *data = calldata;
3606         struct nfs_client *clp = data->client;
3607
3608         if (atomic_read(&clp->cl_count) > 1)
3609                 nfs4_schedule_state_renewal(clp);
3610         nfs_put_client(clp);
3611         kfree(data);
3612 }
3613
3614 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3615 {
3616         struct nfs4_renewdata *data = calldata;
3617         struct nfs_client *clp = data->client;
3618         unsigned long timestamp = data->timestamp;
3619
3620         if (task->tk_status < 0) {
3621                 /* Unless we're shutting down, schedule state recovery! */
3622                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3623                         return;
3624                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3625                         nfs4_schedule_lease_recovery(clp);
3626                         return;
3627                 }
3628                 nfs4_schedule_path_down_recovery(clp);
3629         }
3630         do_renew_lease(clp, timestamp);
3631 }
3632
3633 static const struct rpc_call_ops nfs4_renew_ops = {
3634         .rpc_call_done = nfs4_renew_done,
3635         .rpc_release = nfs4_renew_release,
3636 };
3637
3638 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3639 {
3640         struct rpc_message msg = {
3641                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3642                 .rpc_argp       = clp,
3643                 .rpc_cred       = cred,
3644         };
3645         struct nfs4_renewdata *data;
3646
3647         if (renew_flags == 0)
3648                 return 0;
3649         if (!atomic_inc_not_zero(&clp->cl_count))
3650                 return -EIO;
3651         data = kmalloc(sizeof(*data), GFP_NOFS);
3652         if (data == NULL)
3653                 return -ENOMEM;
3654         data->client = clp;
3655         data->timestamp = jiffies;
3656         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3657                         &nfs4_renew_ops, data);
3658 }
3659
3660 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3661 {
3662         struct rpc_message msg = {
3663                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3664                 .rpc_argp       = clp,
3665                 .rpc_cred       = cred,
3666         };
3667         unsigned long now = jiffies;
3668         int status;
3669
3670         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3671         if (status < 0)
3672                 return status;
3673         do_renew_lease(clp, now);
3674         return 0;
3675 }
3676
3677 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3678 {
3679         return (server->caps & NFS_CAP_ACLS)
3680                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3681                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3682 }
3683
3684 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3685  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3686  * the stack.
3687  */
3688 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3689
3690 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3691                 struct page **pages, unsigned int *pgbase)
3692 {
3693         struct page *newpage, **spages;
3694         int rc = 0;
3695         size_t len;
3696         spages = pages;
3697
3698         do {
3699                 len = min_t(size_t, PAGE_SIZE, buflen);
3700                 newpage = alloc_page(GFP_KERNEL);
3701
3702                 if (newpage == NULL)
3703                         goto unwind;
3704                 memcpy(page_address(newpage), buf, len);
3705                 buf += len;
3706                 buflen -= len;
3707                 *pages++ = newpage;
3708                 rc++;
3709         } while (buflen != 0);
3710
3711         return rc;
3712
3713 unwind:
3714         for(; rc > 0; rc--)
3715                 __free_page(spages[rc-1]);
3716         return -ENOMEM;
3717 }
3718
3719 struct nfs4_cached_acl {
3720         int cached;
3721         size_t len;
3722         char data[0];
3723 };
3724
3725 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3726 {
3727         struct nfs_inode *nfsi = NFS_I(inode);
3728
3729         spin_lock(&inode->i_lock);
3730         kfree(nfsi->nfs4_acl);
3731         nfsi->nfs4_acl = acl;
3732         spin_unlock(&inode->i_lock);
3733 }
3734
3735 static void nfs4_zap_acl_attr(struct inode *inode)
3736 {
3737         nfs4_set_cached_acl(inode, NULL);
3738 }
3739
3740 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3741 {
3742         struct nfs_inode *nfsi = NFS_I(inode);
3743         struct nfs4_cached_acl *acl;
3744         int ret = -ENOENT;
3745
3746         spin_lock(&inode->i_lock);
3747         acl = nfsi->nfs4_acl;
3748         if (acl == NULL)
3749                 goto out;
3750         if (buf == NULL) /* user is just asking for length */
3751                 goto out_len;
3752         if (acl->cached == 0)
3753                 goto out;
3754         ret = -ERANGE; /* see getxattr(2) man page */
3755         if (acl->len > buflen)
3756                 goto out;
3757         memcpy(buf, acl->data, acl->len);
3758 out_len:
3759         ret = acl->len;
3760 out:
3761         spin_unlock(&inode->i_lock);
3762         return ret;
3763 }
3764
3765 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3766 {
3767         struct nfs4_cached_acl *acl;
3768         size_t buflen = sizeof(*acl) + acl_len;
3769
3770         if (buflen <= PAGE_SIZE) {
3771                 acl = kmalloc(buflen, GFP_KERNEL);
3772                 if (acl == NULL)
3773                         goto out;
3774                 acl->cached = 1;
3775                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3776         } else {
3777                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3778                 if (acl == NULL)
3779                         goto out;
3780                 acl->cached = 0;
3781         }
3782         acl->len = acl_len;
3783 out:
3784         nfs4_set_cached_acl(inode, acl);
3785 }
3786
3787 /*
3788  * The getxattr API returns the required buffer length when called with a
3789  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3790  * the required buf.  On a NULL buf, we send a page of data to the server
3791  * guessing that the ACL request can be serviced by a page. If so, we cache
3792  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3793  * the cache. If not so, we throw away the page, and cache the required
3794  * length. The next getxattr call will then produce another round trip to
3795  * the server, this time with the input buf of the required size.
3796  */
3797 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3798 {
3799         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3800         struct nfs_getaclargs args = {
3801                 .fh = NFS_FH(inode),
3802                 .acl_pages = pages,
3803                 .acl_len = buflen,
3804         };
3805         struct nfs_getaclres res = {
3806                 .acl_len = buflen,
3807         };
3808         struct rpc_message msg = {
3809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3810                 .rpc_argp = &args,
3811                 .rpc_resp = &res,
3812         };
3813         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3814         int ret = -ENOMEM, i;
3815
3816         /* As long as we're doing a round trip to the server anyway,
3817          * let's be prepared for a page of acl data. */
3818         if (npages == 0)
3819                 npages = 1;
3820         if (npages > ARRAY_SIZE(pages))
3821                 return -ERANGE;
3822
3823         for (i = 0; i < npages; i++) {
3824                 pages[i] = alloc_page(GFP_KERNEL);
3825                 if (!pages[i])
3826                         goto out_free;
3827         }
3828
3829         /* for decoding across pages */
3830         res.acl_scratch = alloc_page(GFP_KERNEL);
3831         if (!res.acl_scratch)
3832                 goto out_free;
3833
3834         args.acl_len = npages * PAGE_SIZE;
3835         args.acl_pgbase = 0;
3836
3837         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3838                 __func__, buf, buflen, npages, args.acl_len);
3839         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3840                              &msg, &args.seq_args, &res.seq_res, 0);
3841         if (ret)
3842                 goto out_free;
3843
3844         /* Handle the case where the passed-in buffer is too short */
3845         if (res.acl_flags & NFS4_ACL_TRUNC) {
3846                 /* Did the user only issue a request for the acl length? */
3847                 if (buf == NULL)
3848                         goto out_ok;
3849                 ret = -ERANGE;
3850                 goto out_free;
3851         }
3852         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3853         if (buf) {
3854                 if (res.acl_len > buflen) {
3855                         ret = -ERANGE;
3856                         goto out_free;
3857                 }
3858                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3859         }
3860 out_ok:
3861         ret = res.acl_len;
3862 out_free:
3863         for (i = 0; i < npages; i++)
3864                 if (pages[i])
3865                         __free_page(pages[i]);
3866         if (res.acl_scratch)
3867                 __free_page(res.acl_scratch);
3868         return ret;
3869 }
3870
3871 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3872 {
3873         struct nfs4_exception exception = { };
3874         ssize_t ret;
3875         do {
3876                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3877                 if (ret >= 0)
3878                         break;
3879                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3880         } while (exception.retry);
3881         return ret;
3882 }
3883
3884 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3885 {
3886         struct nfs_server *server = NFS_SERVER(inode);
3887         int ret;
3888
3889         if (!nfs4_server_supports_acls(server))
3890                 return -EOPNOTSUPP;
3891         ret = nfs_revalidate_inode(server, inode);
3892         if (ret < 0)
3893                 return ret;
3894         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3895                 nfs_zap_acl_cache(inode);
3896         ret = nfs4_read_cached_acl(inode, buf, buflen);
3897         if (ret != -ENOENT)
3898                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3899                  * but no cached acl data, just the acl length */
3900                 return ret;
3901         return nfs4_get_acl_uncached(inode, buf, buflen);
3902 }
3903
3904 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3905 {
3906         struct nfs_server *server = NFS_SERVER(inode);
3907         struct page *pages[NFS4ACL_MAXPAGES];
3908         struct nfs_setaclargs arg = {
3909                 .fh             = NFS_FH(inode),
3910                 .acl_pages      = pages,
3911                 .acl_len        = buflen,
3912         };
3913         struct nfs_setaclres res;
3914         struct rpc_message msg = {
3915                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3916                 .rpc_argp       = &arg,
3917                 .rpc_resp       = &res,
3918         };
3919         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3920         int ret, i;
3921
3922         if (!nfs4_server_supports_acls(server))
3923                 return -EOPNOTSUPP;
3924         if (npages > ARRAY_SIZE(pages))
3925                 return -ERANGE;
3926         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3927         if (i < 0)
3928                 return i;
3929         nfs4_inode_return_delegation(inode);
3930         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3931
3932         /*
3933          * Free each page after tx, so the only ref left is
3934          * held by the network stack
3935          */
3936         for (; i > 0; i--)
3937                 put_page(pages[i-1]);
3938
3939         /*
3940          * Acl update can result in inode attribute update.
3941          * so mark the attribute cache invalid.
3942          */
3943         spin_lock(&inode->i_lock);
3944         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3945         spin_unlock(&inode->i_lock);
3946         nfs_access_zap_cache(inode);
3947         nfs_zap_acl_cache(inode);
3948         return ret;
3949 }
3950
3951 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3952 {
3953         struct nfs4_exception exception = { };
3954         int err;
3955         do {
3956                 err = nfs4_handle_exception(NFS_SERVER(inode),
3957                                 __nfs4_proc_set_acl(inode, buf, buflen),
3958                                 &exception);
3959         } while (exception.retry);
3960         return err;
3961 }
3962
3963 static int
3964 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3965 {
3966         struct nfs_client *clp = server->nfs_client;
3967
3968         if (task->tk_status >= 0)
3969                 return 0;
3970         switch(task->tk_status) {
3971                 case -NFS4ERR_DELEG_REVOKED:
3972                 case -NFS4ERR_ADMIN_REVOKED:
3973                 case -NFS4ERR_BAD_STATEID:
3974                         if (state == NULL)
3975                                 break;
3976                         nfs_remove_bad_delegation(state->inode);
3977                 case -NFS4ERR_OPENMODE:
3978                         if (state == NULL)
3979                                 break;
3980                         nfs4_schedule_stateid_recovery(server, state);
3981                         goto wait_on_recovery;
3982                 case -NFS4ERR_EXPIRED:
3983                         if (state != NULL)
3984                                 nfs4_schedule_stateid_recovery(server, state);
3985                 case -NFS4ERR_STALE_STATEID:
3986                 case -NFS4ERR_STALE_CLIENTID:
3987                         nfs4_schedule_lease_recovery(clp);
3988                         goto wait_on_recovery;
3989 #if defined(CONFIG_NFS_V4_1)
3990                 case -NFS4ERR_BADSESSION:
3991                 case -NFS4ERR_BADSLOT:
3992                 case -NFS4ERR_BAD_HIGH_SLOT:
3993                 case -NFS4ERR_DEADSESSION:
3994                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3995                 case -NFS4ERR_SEQ_FALSE_RETRY:
3996                 case -NFS4ERR_SEQ_MISORDERED:
3997                         dprintk("%s ERROR %d, Reset session\n", __func__,
3998                                 task->tk_status);
3999                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4000                         task->tk_status = 0;
4001                         return -EAGAIN;
4002 #endif /* CONFIG_NFS_V4_1 */
4003                 case -NFS4ERR_DELAY:
4004                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4005                 case -NFS4ERR_GRACE:
4006                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4007                         task->tk_status = 0;
4008                         return -EAGAIN;
4009                 case -NFS4ERR_RETRY_UNCACHED_REP:
4010                 case -NFS4ERR_OLD_STATEID:
4011                         task->tk_status = 0;
4012                         return -EAGAIN;
4013         }
4014         task->tk_status = nfs4_map_errors(task->tk_status);
4015         return 0;
4016 wait_on_recovery:
4017         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4018         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4019                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4020         task->tk_status = 0;
4021         return -EAGAIN;
4022 }
4023
4024 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4025                                     nfs4_verifier *bootverf)
4026 {
4027         __be32 verf[2];
4028
4029         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4030                 /* An impossible timestamp guarantees this value
4031                  * will never match a generated boot time. */
4032                 verf[0] = 0;
4033                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4034         } else {
4035                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4036                 verf[0] = (__be32)nn->boot_time.tv_sec;
4037                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4038         }
4039         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4040 }
4041
4042 static unsigned int
4043 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4044                                    char *buf, size_t len)
4045 {
4046         unsigned int result;
4047
4048         rcu_read_lock();
4049         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4050                                 clp->cl_ipaddr,
4051                                 rpc_peeraddr2str(clp->cl_rpcclient,
4052                                                         RPC_DISPLAY_ADDR),
4053                                 rpc_peeraddr2str(clp->cl_rpcclient,
4054                                                         RPC_DISPLAY_PROTO));
4055         rcu_read_unlock();
4056         return result;
4057 }
4058
4059 static unsigned int
4060 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4061                                 char *buf, size_t len)
4062 {
4063         char *nodename = clp->cl_rpcclient->cl_nodename;
4064
4065         if (nfs4_client_id_uniquifier[0] != '\0')
4066                 nodename = nfs4_client_id_uniquifier;
4067         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4068                                 clp->rpc_ops->version, clp->cl_minorversion,
4069                                 nodename);
4070 }
4071
4072 /**
4073  * nfs4_proc_setclientid - Negotiate client ID
4074  * @clp: state data structure
4075  * @program: RPC program for NFSv4 callback service
4076  * @port: IP port number for NFS4 callback service
4077  * @cred: RPC credential to use for this call
4078  * @res: where to place the result
4079  *
4080  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4081  */
4082 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4083                 unsigned short port, struct rpc_cred *cred,
4084                 struct nfs4_setclientid_res *res)
4085 {
4086         nfs4_verifier sc_verifier;
4087         struct nfs4_setclientid setclientid = {
4088                 .sc_verifier = &sc_verifier,
4089                 .sc_prog = program,
4090                 .sc_cb_ident = clp->cl_cb_ident,
4091         };
4092         struct rpc_message msg = {
4093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4094                 .rpc_argp = &setclientid,
4095                 .rpc_resp = res,
4096                 .rpc_cred = cred,
4097         };
4098         int status;
4099
4100         /* nfs_client_id4 */
4101         nfs4_init_boot_verifier(clp, &sc_verifier);
4102         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4103                 setclientid.sc_name_len =
4104                                 nfs4_init_uniform_client_string(clp,
4105                                                 setclientid.sc_name,
4106                                                 sizeof(setclientid.sc_name));
4107         else
4108                 setclientid.sc_name_len =
4109                                 nfs4_init_nonuniform_client_string(clp,
4110                                                 setclientid.sc_name,
4111                                                 sizeof(setclientid.sc_name));
4112         /* cb_client4 */
4113         rcu_read_lock();
4114         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4115                                 sizeof(setclientid.sc_netid),
4116                                 rpc_peeraddr2str(clp->cl_rpcclient,
4117                                                         RPC_DISPLAY_NETID));
4118         rcu_read_unlock();
4119         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4120                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4121                                 clp->cl_ipaddr, port >> 8, port & 255);
4122
4123         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4124                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4125                 setclientid.sc_name_len, setclientid.sc_name);
4126         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4127         dprintk("NFS reply setclientid: %d\n", status);
4128         return status;
4129 }
4130
4131 /**
4132  * nfs4_proc_setclientid_confirm - Confirm client ID
4133  * @clp: state data structure
4134  * @res: result of a previous SETCLIENTID
4135  * @cred: RPC credential to use for this call
4136  *
4137  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4138  */
4139 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4140                 struct nfs4_setclientid_res *arg,
4141                 struct rpc_cred *cred)
4142 {
4143         struct nfs_fsinfo fsinfo;
4144         struct rpc_message msg = {
4145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4146                 .rpc_argp = arg,
4147                 .rpc_resp = &fsinfo,
4148                 .rpc_cred = cred,
4149         };
4150         unsigned long now;
4151         int status;
4152
4153         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4154                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4155                 clp->cl_clientid);
4156         now = jiffies;
4157         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4158         if (status == 0) {
4159                 spin_lock(&clp->cl_lock);
4160                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4161                 clp->cl_last_renewal = now;
4162                 spin_unlock(&clp->cl_lock);
4163         }
4164         dprintk("NFS reply setclientid_confirm: %d\n", status);
4165         return status;
4166 }
4167
4168 struct nfs4_delegreturndata {
4169         struct nfs4_delegreturnargs args;
4170         struct nfs4_delegreturnres res;
4171         struct nfs_fh fh;
4172         nfs4_stateid stateid;
4173         unsigned long timestamp;
4174         struct nfs_fattr fattr;
4175         int rpc_status;
4176 };
4177
4178 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4179 {
4180         struct nfs4_delegreturndata *data = calldata;
4181
4182         if (!nfs4_sequence_done(task, &data->res.seq_res))
4183                 return;
4184
4185         switch (task->tk_status) {
4186         case -NFS4ERR_STALE_STATEID:
4187         case -NFS4ERR_EXPIRED:
4188         case 0:
4189                 renew_lease(data->res.server, data->timestamp);
4190                 break;
4191         default:
4192                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4193                                 -EAGAIN) {
4194                         rpc_restart_call_prepare(task);
4195                         return;
4196                 }
4197         }
4198         data->rpc_status = task->tk_status;
4199 }
4200
4201 static void nfs4_delegreturn_release(void *calldata)
4202 {
4203         kfree(calldata);
4204 }
4205
4206 #if defined(CONFIG_NFS_V4_1)
4207 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4208 {
4209         struct nfs4_delegreturndata *d_data;
4210
4211         d_data = (struct nfs4_delegreturndata *)data;
4212
4213         nfs4_setup_sequence(d_data->res.server,
4214                         &d_data->args.seq_args,
4215                         &d_data->res.seq_res,
4216                         task);
4217 }
4218 #endif /* CONFIG_NFS_V4_1 */
4219
4220 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4221 #if defined(CONFIG_NFS_V4_1)
4222         .rpc_call_prepare = nfs4_delegreturn_prepare,
4223 #endif /* CONFIG_NFS_V4_1 */
4224         .rpc_call_done = nfs4_delegreturn_done,
4225         .rpc_release = nfs4_delegreturn_release,
4226 };
4227
4228 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4229 {
4230         struct nfs4_delegreturndata *data;
4231         struct nfs_server *server = NFS_SERVER(inode);
4232         struct rpc_task *task;
4233         struct rpc_message msg = {
4234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4235                 .rpc_cred = cred,
4236         };
4237         struct rpc_task_setup task_setup_data = {
4238                 .rpc_client = server->client,
4239                 .rpc_message = &msg,
4240                 .callback_ops = &nfs4_delegreturn_ops,
4241                 .flags = RPC_TASK_ASYNC,
4242         };
4243         int status = 0;
4244
4245         data = kzalloc(sizeof(*data), GFP_NOFS);
4246         if (data == NULL)
4247                 return -ENOMEM;
4248         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4249         data->args.fhandle = &data->fh;
4250         data->args.stateid = &data->stateid;
4251         data->args.bitmask = server->cache_consistency_bitmask;
4252         nfs_copy_fh(&data->fh, NFS_FH(inode));
4253         nfs4_stateid_copy(&data->stateid, stateid);
4254         data->res.fattr = &data->fattr;
4255         data->res.server = server;
4256         nfs_fattr_init(data->res.fattr);
4257         data->timestamp = jiffies;
4258         data->rpc_status = 0;
4259
4260         task_setup_data.callback_data = data;
4261         msg.rpc_argp = &data->args;
4262         msg.rpc_resp = &data->res;
4263         task = rpc_run_task(&task_setup_data);
4264         if (IS_ERR(task))
4265                 return PTR_ERR(task);
4266         if (!issync)
4267                 goto out;
4268         status = nfs4_wait_for_completion_rpc_task(task);
4269         if (status != 0)
4270                 goto out;
4271         status = data->rpc_status;
4272         if (status == 0)
4273                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4274         else
4275                 nfs_refresh_inode(inode, &data->fattr);
4276 out:
4277         rpc_put_task(task);
4278         return status;
4279 }
4280
4281 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4282 {
4283         struct nfs_server *server = NFS_SERVER(inode);
4284         struct nfs4_exception exception = { };
4285         int err;
4286         do {
4287                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4288                 switch (err) {
4289                         case -NFS4ERR_STALE_STATEID:
4290                         case -NFS4ERR_EXPIRED:
4291                         case 0:
4292                                 return 0;
4293                 }
4294                 err = nfs4_handle_exception(server, err, &exception);
4295         } while (exception.retry);
4296         return err;
4297 }
4298
4299 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4300 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4301
4302 /*
4303  * sleep, with exponential backoff, and retry the LOCK operation.
4304  */
4305 static unsigned long
4306 nfs4_set_lock_task_retry(unsigned long timeout)
4307 {
4308         freezable_schedule_timeout_killable(timeout);
4309         timeout <<= 1;
4310         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4311                 return NFS4_LOCK_MAXTIMEOUT;
4312         return timeout;
4313 }
4314
4315 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4316 {
4317         struct inode *inode = state->inode;
4318         struct nfs_server *server = NFS_SERVER(inode);
4319         struct nfs_client *clp = server->nfs_client;
4320         struct nfs_lockt_args arg = {
4321                 .fh = NFS_FH(inode),
4322                 .fl = request,
4323         };
4324         struct nfs_lockt_res res = {
4325                 .denied = request,
4326         };
4327         struct rpc_message msg = {
4328                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4329                 .rpc_argp       = &arg,
4330                 .rpc_resp       = &res,
4331                 .rpc_cred       = state->owner->so_cred,
4332         };
4333         struct nfs4_lock_state *lsp;
4334         int status;
4335
4336         arg.lock_owner.clientid = clp->cl_clientid;
4337         status = nfs4_set_lock_state(state, request);
4338         if (status != 0)
4339                 goto out;
4340         lsp = request->fl_u.nfs4_fl.owner;
4341         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4342         arg.lock_owner.s_dev = server->s_dev;
4343         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4344         switch (status) {
4345                 case 0:
4346                         request->fl_type = F_UNLCK;
4347                         break;
4348                 case -NFS4ERR_DENIED:
4349                         status = 0;
4350         }
4351         request->fl_ops->fl_release_private(request);
4352 out:
4353         return status;
4354 }
4355
4356 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4357 {
4358         struct nfs4_exception exception = { };
4359         int err;
4360
4361         do {
4362                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4363                                 _nfs4_proc_getlk(state, cmd, request),
4364                                 &exception);
4365         } while (exception.retry);
4366         return err;
4367 }
4368
4369 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4370 {
4371         int res = 0;
4372         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4373                 case FL_POSIX:
4374                         res = posix_lock_file_wait(file, fl);
4375                         break;
4376                 case FL_FLOCK:
4377                         res = flock_lock_file_wait(file, fl);
4378                         break;
4379                 default:
4380                         BUG();
4381         }
4382         return res;
4383 }
4384
4385 struct nfs4_unlockdata {
4386         struct nfs_locku_args arg;
4387         struct nfs_locku_res res;
4388         struct nfs4_lock_state *lsp;
4389         struct nfs_open_context *ctx;
4390         struct file_lock fl;
4391         const struct nfs_server *server;
4392         unsigned long timestamp;
4393 };
4394
4395 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4396                 struct nfs_open_context *ctx,
4397                 struct nfs4_lock_state *lsp,
4398                 struct nfs_seqid *seqid)
4399 {
4400         struct nfs4_unlockdata *p;
4401         struct inode *inode = lsp->ls_state->inode;
4402
4403         p = kzalloc(sizeof(*p), GFP_NOFS);
4404         if (p == NULL)
4405                 return NULL;
4406         p->arg.fh = NFS_FH(inode);
4407         p->arg.fl = &p->fl;
4408         p->arg.seqid = seqid;
4409         p->res.seqid = seqid;
4410         p->arg.stateid = &lsp->ls_stateid;
4411         p->lsp = lsp;
4412         atomic_inc(&lsp->ls_count);
4413         /* Ensure we don't close file until we're done freeing locks! */
4414         p->ctx = get_nfs_open_context(ctx);
4415         memcpy(&p->fl, fl, sizeof(p->fl));
4416         p->server = NFS_SERVER(inode);
4417         return p;
4418 }
4419
4420 static void nfs4_locku_release_calldata(void *data)
4421 {
4422         struct nfs4_unlockdata *calldata = data;
4423         nfs_free_seqid(calldata->arg.seqid);
4424         nfs4_put_lock_state(calldata->lsp);
4425         put_nfs_open_context(calldata->ctx);
4426         kfree(calldata);
4427 }
4428
4429 static void nfs4_locku_done(struct rpc_task *task, void *data)
4430 {
4431         struct nfs4_unlockdata *calldata = data;
4432
4433         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4434                 return;
4435         switch (task->tk_status) {
4436                 case 0:
4437                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4438                                         &calldata->res.stateid);
4439                         renew_lease(calldata->server, calldata->timestamp);
4440                         break;
4441                 case -NFS4ERR_BAD_STATEID:
4442                 case -NFS4ERR_OLD_STATEID:
4443                 case -NFS4ERR_STALE_STATEID:
4444                 case -NFS4ERR_EXPIRED:
4445                         break;
4446                 default:
4447                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4448                                 rpc_restart_call_prepare(task);
4449         }
4450         nfs_release_seqid(calldata->arg.seqid);
4451 }
4452
4453 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4454 {
4455         struct nfs4_unlockdata *calldata = data;
4456
4457         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4458                 goto out_wait;
4459         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4460                 /* Note: exit _without_ running nfs4_locku_done */
4461                 goto out_no_action;
4462         }
4463         calldata->timestamp = jiffies;
4464         if (nfs4_setup_sequence(calldata->server,
4465                                 &calldata->arg.seq_args,
4466                                 &calldata->res.seq_res,
4467                                 task) != 0)
4468                 nfs_release_seqid(calldata->arg.seqid);
4469         return;
4470 out_no_action:
4471         task->tk_action = NULL;
4472 out_wait:
4473         nfs4_sequence_done(task, &calldata->res.seq_res);
4474 }
4475
4476 static const struct rpc_call_ops nfs4_locku_ops = {
4477         .rpc_call_prepare = nfs4_locku_prepare,
4478         .rpc_call_done = nfs4_locku_done,
4479         .rpc_release = nfs4_locku_release_calldata,
4480 };
4481
4482 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4483                 struct nfs_open_context *ctx,
4484                 struct nfs4_lock_state *lsp,
4485                 struct nfs_seqid *seqid)
4486 {
4487         struct nfs4_unlockdata *data;
4488         struct rpc_message msg = {
4489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4490                 .rpc_cred = ctx->cred,
4491         };
4492         struct rpc_task_setup task_setup_data = {
4493                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4494                 .rpc_message = &msg,
4495                 .callback_ops = &nfs4_locku_ops,
4496                 .workqueue = nfsiod_workqueue,
4497                 .flags = RPC_TASK_ASYNC,
4498         };
4499
4500         /* Ensure this is an unlock - when canceling a lock, the
4501          * canceled lock is passed in, and it won't be an unlock.
4502          */
4503         fl->fl_type = F_UNLCK;
4504
4505         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4506         if (data == NULL) {
4507                 nfs_free_seqid(seqid);
4508                 return ERR_PTR(-ENOMEM);
4509         }
4510
4511         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4512         msg.rpc_argp = &data->arg;
4513         msg.rpc_resp = &data->res;
4514         task_setup_data.callback_data = data;
4515         return rpc_run_task(&task_setup_data);
4516 }
4517
4518 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4519 {
4520         struct inode *inode = state->inode;
4521         struct nfs4_state_owner *sp = state->owner;
4522         struct nfs_inode *nfsi = NFS_I(inode);
4523         struct nfs_seqid *seqid;
4524         struct nfs4_lock_state *lsp;
4525         struct rpc_task *task;
4526         int status = 0;
4527         unsigned char fl_flags = request->fl_flags;
4528
4529         status = nfs4_set_lock_state(state, request);
4530         /* Unlock _before_ we do the RPC call */
4531         request->fl_flags |= FL_EXISTS;
4532         /* Exclude nfs_delegation_claim_locks() */
4533         mutex_lock(&sp->so_delegreturn_mutex);
4534         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4535         down_read(&nfsi->rwsem);
4536         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4537                 up_read(&nfsi->rwsem);
4538                 mutex_unlock(&sp->so_delegreturn_mutex);
4539                 goto out;
4540         }
4541         up_read(&nfsi->rwsem);
4542         mutex_unlock(&sp->so_delegreturn_mutex);
4543         if (status != 0)
4544                 goto out;
4545         /* Is this a delegated lock? */
4546         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4547                 goto out;
4548         lsp = request->fl_u.nfs4_fl.owner;
4549         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4550         status = -ENOMEM;
4551         if (seqid == NULL)
4552                 goto out;
4553         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4554         status = PTR_ERR(task);
4555         if (IS_ERR(task))
4556                 goto out;
4557         status = nfs4_wait_for_completion_rpc_task(task);
4558         rpc_put_task(task);
4559 out:
4560         request->fl_flags = fl_flags;
4561         return status;
4562 }
4563
4564 struct nfs4_lockdata {
4565         struct nfs_lock_args arg;
4566         struct nfs_lock_res res;
4567         struct nfs4_lock_state *lsp;
4568         struct nfs_open_context *ctx;
4569         struct file_lock fl;
4570         unsigned long timestamp;
4571         int rpc_status;
4572         int cancelled;
4573         struct nfs_server *server;
4574 };
4575
4576 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4577                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4578                 gfp_t gfp_mask)
4579 {
4580         struct nfs4_lockdata *p;
4581         struct inode *inode = lsp->ls_state->inode;
4582         struct nfs_server *server = NFS_SERVER(inode);
4583
4584         p = kzalloc(sizeof(*p), gfp_mask);
4585         if (p == NULL)
4586                 return NULL;
4587
4588         p->arg.fh = NFS_FH(inode);
4589         p->arg.fl = &p->fl;
4590         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4591         if (p->arg.open_seqid == NULL)
4592                 goto out_free;
4593         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4594         if (p->arg.lock_seqid == NULL)
4595                 goto out_free_seqid;
4596         p->arg.lock_stateid = &lsp->ls_stateid;
4597         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4598         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4599         p->arg.lock_owner.s_dev = server->s_dev;
4600         p->res.lock_seqid = p->arg.lock_seqid;
4601         p->lsp = lsp;
4602         p->server = server;
4603         atomic_inc(&lsp->ls_count);
4604         p->ctx = get_nfs_open_context(ctx);
4605         memcpy(&p->fl, fl, sizeof(p->fl));
4606         return p;
4607 out_free_seqid:
4608         nfs_free_seqid(p->arg.open_seqid);
4609 out_free:
4610         kfree(p);
4611         return NULL;
4612 }
4613
4614 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4615 {
4616         struct nfs4_lockdata *data = calldata;
4617         struct nfs4_state *state = data->lsp->ls_state;
4618
4619         dprintk("%s: begin!\n", __func__);
4620         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4621                 goto out_wait;
4622         /* Do we need to do an open_to_lock_owner? */
4623         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4624                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4625                         goto out_release_lock_seqid;
4626                 }
4627                 data->arg.open_stateid = &state->stateid;
4628                 data->arg.new_lock_owner = 1;
4629                 data->res.open_seqid = data->arg.open_seqid;
4630         } else
4631                 data->arg.new_lock_owner = 0;
4632         data->timestamp = jiffies;
4633         if (nfs4_setup_sequence(data->server,
4634                                 &data->arg.seq_args,
4635                                 &data->res.seq_res,
4636                                 task) == 0)
4637                 return;
4638         nfs_release_seqid(data->arg.open_seqid);
4639 out_release_lock_seqid:
4640         nfs_release_seqid(data->arg.lock_seqid);
4641 out_wait:
4642         nfs4_sequence_done(task, &data->res.seq_res);
4643         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4644 }
4645
4646 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4647 {
4648         struct nfs4_lockdata *data = calldata;
4649
4650         dprintk("%s: begin!\n", __func__);
4651
4652         if (!nfs4_sequence_done(task, &data->res.seq_res))
4653                 return;
4654
4655         data->rpc_status = task->tk_status;
4656         if (data->arg.new_lock_owner != 0) {
4657                 if (data->rpc_status == 0)
4658                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4659                 else
4660                         goto out;
4661         }
4662         if (data->rpc_status == 0) {
4663                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4664                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4665                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4666         }
4667 out:
4668         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4669 }
4670
4671 static void nfs4_lock_release(void *calldata)
4672 {
4673         struct nfs4_lockdata *data = calldata;
4674
4675         dprintk("%s: begin!\n", __func__);
4676         nfs_free_seqid(data->arg.open_seqid);
4677         if (data->cancelled != 0) {
4678                 struct rpc_task *task;
4679                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4680                                 data->arg.lock_seqid);
4681                 if (!IS_ERR(task))
4682                         rpc_put_task_async(task);
4683                 dprintk("%s: cancelling lock!\n", __func__);
4684         } else
4685                 nfs_free_seqid(data->arg.lock_seqid);
4686         nfs4_put_lock_state(data->lsp);
4687         put_nfs_open_context(data->ctx);
4688         kfree(data);
4689         dprintk("%s: done!\n", __func__);
4690 }
4691
4692 static const struct rpc_call_ops nfs4_lock_ops = {
4693         .rpc_call_prepare = nfs4_lock_prepare,
4694         .rpc_call_done = nfs4_lock_done,
4695         .rpc_release = nfs4_lock_release,
4696 };
4697
4698 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4699 {
4700         switch (error) {
4701         case -NFS4ERR_ADMIN_REVOKED:
4702         case -NFS4ERR_BAD_STATEID:
4703                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4704                 if (new_lock_owner != 0 ||
4705                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4706                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4707                 break;
4708         case -NFS4ERR_STALE_STATEID:
4709                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4710         case -NFS4ERR_EXPIRED:
4711                 nfs4_schedule_lease_recovery(server->nfs_client);
4712         };
4713 }
4714
4715 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4716 {
4717         struct nfs4_lockdata *data;
4718         struct rpc_task *task;
4719         struct rpc_message msg = {
4720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4721                 .rpc_cred = state->owner->so_cred,
4722         };
4723         struct rpc_task_setup task_setup_data = {
4724                 .rpc_client = NFS_CLIENT(state->inode),
4725                 .rpc_message = &msg,
4726                 .callback_ops = &nfs4_lock_ops,
4727                 .workqueue = nfsiod_workqueue,
4728                 .flags = RPC_TASK_ASYNC,
4729         };
4730         int ret;
4731
4732         dprintk("%s: begin!\n", __func__);
4733         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4734                         fl->fl_u.nfs4_fl.owner,
4735                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4736         if (data == NULL)
4737                 return -ENOMEM;
4738         if (IS_SETLKW(cmd))
4739                 data->arg.block = 1;
4740         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4741         msg.rpc_argp = &data->arg;
4742         msg.rpc_resp = &data->res;
4743         task_setup_data.callback_data = data;
4744         if (recovery_type > NFS_LOCK_NEW) {
4745                 if (recovery_type == NFS_LOCK_RECLAIM)
4746                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4747                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4748         }
4749         task = rpc_run_task(&task_setup_data);
4750         if (IS_ERR(task))
4751                 return PTR_ERR(task);
4752         ret = nfs4_wait_for_completion_rpc_task(task);
4753         if (ret == 0) {
4754                 ret = data->rpc_status;
4755                 if (ret)
4756                         nfs4_handle_setlk_error(data->server, data->lsp,
4757                                         data->arg.new_lock_owner, ret);
4758         } else
4759                 data->cancelled = 1;
4760         rpc_put_task(task);
4761         dprintk("%s: done, ret = %d!\n", __func__, ret);
4762         return ret;
4763 }
4764
4765 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4766 {
4767         struct nfs_server *server = NFS_SERVER(state->inode);
4768         struct nfs4_exception exception = {
4769                 .inode = state->inode,
4770         };
4771         int err;
4772
4773         do {
4774                 /* Cache the lock if possible... */
4775                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4776                         return 0;
4777                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4778                 if (err != -NFS4ERR_DELAY)
4779                         break;
4780                 nfs4_handle_exception(server, err, &exception);
4781         } while (exception.retry);
4782         return err;
4783 }
4784
4785 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4786 {
4787         struct nfs_server *server = NFS_SERVER(state->inode);
4788         struct nfs4_exception exception = {
4789                 .inode = state->inode,
4790         };
4791         int err;
4792
4793         err = nfs4_set_lock_state(state, request);
4794         if (err != 0)
4795                 return err;
4796         do {
4797                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4798                         return 0;
4799                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4800                 switch (err) {
4801                 default:
4802                         goto out;
4803                 case -NFS4ERR_GRACE:
4804                 case -NFS4ERR_DELAY:
4805                         nfs4_handle_exception(server, err, &exception);
4806                         err = 0;
4807                 }
4808         } while (exception.retry);
4809 out:
4810         return err;
4811 }
4812
4813 #if defined(CONFIG_NFS_V4_1)
4814 /**
4815  * nfs41_check_expired_locks - possibly free a lock stateid
4816  *
4817  * @state: NFSv4 state for an inode
4818  *
4819  * Returns NFS_OK if recovery for this stateid is now finished.
4820  * Otherwise a negative NFS4ERR value is returned.
4821  */
4822 static int nfs41_check_expired_locks(struct nfs4_state *state)
4823 {
4824         int status, ret = -NFS4ERR_BAD_STATEID;
4825         struct nfs4_lock_state *lsp;
4826         struct nfs_server *server = NFS_SERVER(state->inode);
4827
4828         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4829                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4830                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4831                         if (status != NFS_OK) {
4832                                 /* Free the stateid unless the server
4833                                  * informs us the stateid is unrecognized. */
4834                                 if (status != -NFS4ERR_BAD_STATEID)
4835                                         nfs41_free_stateid(server,
4836                                                         &lsp->ls_stateid);
4837                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4838                                 ret = status;
4839                         }
4840                 }
4841         };
4842
4843         return ret;
4844 }
4845
4846 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4847 {
4848         int status = NFS_OK;
4849
4850         if (test_bit(LK_STATE_IN_USE, &state->flags))
4851                 status = nfs41_check_expired_locks(state);
4852         if (status != NFS_OK)
4853                 status = nfs4_lock_expired(state, request);
4854         return status;
4855 }
4856 #endif
4857
4858 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4859 {
4860         struct nfs4_state_owner *sp = state->owner;
4861         struct nfs_inode *nfsi = NFS_I(state->inode);
4862         unsigned char fl_flags = request->fl_flags;
4863         unsigned int seq;
4864         int status = -ENOLCK;
4865
4866         if ((fl_flags & FL_POSIX) &&
4867                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4868                 goto out;
4869         /* Is this a delegated open? */
4870         status = nfs4_set_lock_state(state, request);
4871         if (status != 0)
4872                 goto out;
4873         request->fl_flags |= FL_ACCESS;
4874         status = do_vfs_lock(request->fl_file, request);
4875         if (status < 0)
4876                 goto out;
4877         down_read(&nfsi->rwsem);
4878         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4879                 /* Yes: cache locks! */
4880                 /* ...but avoid races with delegation recall... */
4881                 request->fl_flags = fl_flags & ~FL_SLEEP;
4882                 status = do_vfs_lock(request->fl_file, request);
4883                 goto out_unlock;
4884         }
4885         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
4886         up_read(&nfsi->rwsem);
4887         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4888         if (status != 0)
4889                 goto out;
4890         down_read(&nfsi->rwsem);
4891         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
4892                 status = -NFS4ERR_DELAY;
4893                 goto out_unlock;
4894         }
4895         /* Note: we always want to sleep here! */
4896         request->fl_flags = fl_flags | FL_SLEEP;
4897         if (do_vfs_lock(request->fl_file, request) < 0)
4898                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4899                         "manager!\n", __func__);
4900 out_unlock:
4901         up_read(&nfsi->rwsem);
4902 out:
4903         request->fl_flags = fl_flags;
4904         return status;
4905 }
4906
4907 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4908 {
4909         struct nfs4_exception exception = {
4910                 .state = state,
4911                 .inode = state->inode,
4912         };
4913         int err;
4914
4915         do {
4916                 err = _nfs4_proc_setlk(state, cmd, request);
4917                 if (err == -NFS4ERR_DENIED)
4918                         err = -EAGAIN;
4919                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4920                                 err, &exception);
4921         } while (exception.retry);
4922         return err;
4923 }
4924
4925 static int
4926 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4927 {
4928         struct nfs_open_context *ctx;
4929         struct nfs4_state *state;
4930         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4931         int status;
4932
4933         /* verify open state */
4934         ctx = nfs_file_open_context(filp);
4935         state = ctx->state;
4936
4937         if (request->fl_start < 0 || request->fl_end < 0)
4938                 return -EINVAL;
4939
4940         if (IS_GETLK(cmd)) {
4941                 if (state != NULL)
4942                         return nfs4_proc_getlk(state, F_GETLK, request);
4943                 return 0;
4944         }
4945
4946         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4947                 return -EINVAL;
4948
4949         if (request->fl_type == F_UNLCK) {
4950                 if (state != NULL)
4951                         return nfs4_proc_unlck(state, cmd, request);
4952                 return 0;
4953         }
4954
4955         if (state == NULL)
4956                 return -ENOLCK;
4957         /*
4958          * Don't rely on the VFS having checked the file open mode,
4959          * since it won't do this for flock() locks.
4960          */
4961         switch (request->fl_type) {
4962         case F_RDLCK:
4963                 if (!(filp->f_mode & FMODE_READ))
4964                         return -EBADF;
4965                 break;
4966         case F_WRLCK:
4967                 if (!(filp->f_mode & FMODE_WRITE))
4968                         return -EBADF;
4969         }
4970
4971         do {
4972                 status = nfs4_proc_setlk(state, cmd, request);
4973                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4974                         break;
4975                 timeout = nfs4_set_lock_task_retry(timeout);
4976                 status = -ERESTARTSYS;
4977                 if (signalled())
4978                         break;
4979         } while(status < 0);
4980         return status;
4981 }
4982
4983 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4984 {
4985         struct nfs_server *server = NFS_SERVER(state->inode);
4986         struct nfs4_exception exception = { };
4987         int err;
4988
4989         err = nfs4_set_lock_state(state, fl);
4990         if (err != 0)
4991                 goto out;
4992         do {
4993                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4994                 switch (err) {
4995                         default:
4996                                 printk(KERN_ERR "NFS: %s: unhandled error "
4997                                         "%d.\n", __func__, err);
4998                         case 0:
4999                         case -ESTALE:
5000                                 goto out;
5001                         case -NFS4ERR_STALE_CLIENTID:
5002                         case -NFS4ERR_STALE_STATEID:
5003                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5004                         case -NFS4ERR_EXPIRED:
5005                                 nfs4_schedule_lease_recovery(server->nfs_client);
5006                                 err = -EAGAIN;
5007                                 goto out;
5008                         case -NFS4ERR_BADSESSION:
5009                         case -NFS4ERR_BADSLOT:
5010                         case -NFS4ERR_BAD_HIGH_SLOT:
5011                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5012                         case -NFS4ERR_DEADSESSION:
5013                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5014                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5015                                 err = -EAGAIN;
5016                                 goto out;
5017                         case -NFS4ERR_DELEG_REVOKED:
5018                         case -NFS4ERR_ADMIN_REVOKED:
5019                         case -NFS4ERR_BAD_STATEID:
5020                         case -NFS4ERR_OPENMODE:
5021                                 nfs4_schedule_stateid_recovery(server, state);
5022                                 err = 0;
5023                                 goto out;
5024                         case -ENOMEM:
5025                         case -NFS4ERR_DENIED:
5026                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5027                                 err = 0;
5028                                 goto out;
5029                 }
5030                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5031                 err = nfs4_handle_exception(server, err, &exception);
5032         } while (exception.retry);
5033 out:
5034         return err;
5035 }
5036
5037 struct nfs_release_lockowner_data {
5038         struct nfs4_lock_state *lsp;
5039         struct nfs_server *server;
5040         struct nfs_release_lockowner_args args;
5041 };
5042
5043 static void nfs4_release_lockowner_release(void *calldata)
5044 {
5045         struct nfs_release_lockowner_data *data = calldata;
5046         nfs4_free_lock_state(data->server, data->lsp);
5047         kfree(calldata);
5048 }
5049
5050 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5051         .rpc_release = nfs4_release_lockowner_release,
5052 };
5053
5054 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5055 {
5056         struct nfs_server *server = lsp->ls_state->owner->so_server;
5057         struct nfs_release_lockowner_data *data;
5058         struct rpc_message msg = {
5059                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5060         };
5061
5062         if (server->nfs_client->cl_mvops->minor_version != 0)
5063                 return -EINVAL;
5064         data = kmalloc(sizeof(*data), GFP_NOFS);
5065         if (!data)
5066                 return -ENOMEM;
5067         data->lsp = lsp;
5068         data->server = server;
5069         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5070         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5071         data->args.lock_owner.s_dev = server->s_dev;
5072         msg.rpc_argp = &data->args;
5073         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5074         return 0;
5075 }
5076
5077 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5078
5079 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5080                                    const void *buf, size_t buflen,
5081                                    int flags, int type)
5082 {
5083         if (strcmp(key, "") != 0)
5084                 return -EINVAL;
5085
5086         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5087 }
5088
5089 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5090                                    void *buf, size_t buflen, int type)
5091 {
5092         if (strcmp(key, "") != 0)
5093                 return -EINVAL;
5094
5095         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5096 }
5097
5098 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5099                                        size_t list_len, const char *name,
5100                                        size_t name_len, int type)
5101 {
5102         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5103
5104         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5105                 return 0;
5106
5107         if (list && len <= list_len)
5108                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5109         return len;
5110 }
5111
5112 /*
5113  * nfs_fhget will use either the mounted_on_fileid or the fileid
5114  */
5115 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5116 {
5117         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5118                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5119               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5120               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5121                 return;
5122
5123         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5124                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5125         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5126         fattr->nlink = 2;
5127 }
5128
5129 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5130                                    const struct qstr *name,
5131                                    struct nfs4_fs_locations *fs_locations,
5132                                    struct page *page)
5133 {
5134         struct nfs_server *server = NFS_SERVER(dir);
5135         u32 bitmask[2] = {
5136                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5137         };
5138         struct nfs4_fs_locations_arg args = {
5139                 .dir_fh = NFS_FH(dir),
5140                 .name = name,
5141                 .page = page,
5142                 .bitmask = bitmask,
5143         };
5144         struct nfs4_fs_locations_res res = {
5145                 .fs_locations = fs_locations,
5146         };
5147         struct rpc_message msg = {
5148                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5149                 .rpc_argp = &args,
5150                 .rpc_resp = &res,
5151         };
5152         int status;
5153
5154         dprintk("%s: start\n", __func__);
5155
5156         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5157          * is not supported */
5158         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5159                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5160         else
5161                 bitmask[0] |= FATTR4_WORD0_FILEID;
5162
5163         nfs_fattr_init(&fs_locations->fattr);
5164         fs_locations->server = server;
5165         fs_locations->nlocations = 0;
5166         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5167         dprintk("%s: returned status = %d\n", __func__, status);
5168         return status;
5169 }
5170
5171 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5172                            const struct qstr *name,
5173                            struct nfs4_fs_locations *fs_locations,
5174                            struct page *page)
5175 {
5176         struct nfs4_exception exception = { };
5177         int err;
5178         do {
5179                 err = nfs4_handle_exception(NFS_SERVER(dir),
5180                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5181                                 &exception);
5182         } while (exception.retry);
5183         return err;
5184 }
5185
5186 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5187 {
5188         int status;
5189         struct nfs4_secinfo_arg args = {
5190                 .dir_fh = NFS_FH(dir),
5191                 .name   = name,
5192         };
5193         struct nfs4_secinfo_res res = {
5194                 .flavors     = flavors,
5195         };
5196         struct rpc_message msg = {
5197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5198                 .rpc_argp = &args,
5199                 .rpc_resp = &res,
5200         };
5201
5202         dprintk("NFS call  secinfo %s\n", name->name);
5203         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5204         dprintk("NFS reply  secinfo: %d\n", status);
5205         return status;
5206 }
5207
5208 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5209                       struct nfs4_secinfo_flavors *flavors)
5210 {
5211         struct nfs4_exception exception = { };
5212         int err;
5213         do {
5214                 err = nfs4_handle_exception(NFS_SERVER(dir),
5215                                 _nfs4_proc_secinfo(dir, name, flavors),
5216                                 &exception);
5217         } while (exception.retry);
5218         return err;
5219 }
5220
5221 #ifdef CONFIG_NFS_V4_1
5222 /*
5223  * Check the exchange flags returned by the server for invalid flags, having
5224  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5225  * DS flags set.
5226  */
5227 static int nfs4_check_cl_exchange_flags(u32 flags)
5228 {
5229         if (flags & ~EXCHGID4_FLAG_MASK_R)
5230                 goto out_inval;
5231         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5232             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5233                 goto out_inval;
5234         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5235                 goto out_inval;
5236         return NFS_OK;
5237 out_inval:
5238         return -NFS4ERR_INVAL;
5239 }
5240
5241 static bool
5242 nfs41_same_server_scope(struct nfs41_server_scope *a,
5243                         struct nfs41_server_scope *b)
5244 {
5245         if (a->server_scope_sz == b->server_scope_sz &&
5246             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5247                 return true;
5248
5249         return false;
5250 }
5251
5252 /*
5253  * nfs4_proc_bind_conn_to_session()
5254  *
5255  * The 4.1 client currently uses the same TCP connection for the
5256  * fore and backchannel.
5257  */
5258 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5259 {
5260         int status;
5261         struct nfs41_bind_conn_to_session_res res;
5262         struct rpc_message msg = {
5263                 .rpc_proc =
5264                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5265                 .rpc_argp = clp,
5266                 .rpc_resp = &res,
5267                 .rpc_cred = cred,
5268         };
5269
5270         dprintk("--> %s\n", __func__);
5271
5272         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5273         if (unlikely(res.session == NULL)) {
5274                 status = -ENOMEM;
5275                 goto out;
5276         }
5277
5278         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5279         if (status == 0) {
5280                 if (memcmp(res.session->sess_id.data,
5281                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5282                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5283                         status = -EIO;
5284                         goto out_session;
5285                 }
5286                 if (res.dir != NFS4_CDFS4_BOTH) {
5287                         dprintk("NFS: %s: Unexpected direction from server\n",
5288                                 __func__);
5289                         status = -EIO;
5290                         goto out_session;
5291                 }
5292                 if (res.use_conn_in_rdma_mode) {
5293                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5294                                 __func__);
5295                         status = -EIO;
5296                         goto out_session;
5297                 }
5298         }
5299 out_session:
5300         kfree(res.session);
5301 out:
5302         dprintk("<-- %s status= %d\n", __func__, status);
5303         return status;
5304 }
5305
5306 /*
5307  * nfs4_proc_exchange_id()
5308  *
5309  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5310  *
5311  * Since the clientid has expired, all compounds using sessions
5312  * associated with the stale clientid will be returning
5313  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5314  * be in some phase of session reset.
5315  */
5316 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5317 {
5318         nfs4_verifier verifier;
5319         struct nfs41_exchange_id_args args = {
5320                 .verifier = &verifier,
5321                 .client = clp,
5322                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5323         };
5324         struct nfs41_exchange_id_res res = {
5325                 0
5326         };
5327         int status;
5328         struct rpc_message msg = {
5329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5330                 .rpc_argp = &args,
5331                 .rpc_resp = &res,
5332                 .rpc_cred = cred,
5333         };
5334
5335         nfs4_init_boot_verifier(clp, &verifier);
5336         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5337                                                         sizeof(args.id));
5338         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5339                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5340                 args.id_len, args.id);
5341
5342         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5343                                         GFP_NOFS);
5344         if (unlikely(res.server_owner == NULL)) {
5345                 status = -ENOMEM;
5346                 goto out;
5347         }
5348
5349         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5350                                         GFP_NOFS);
5351         if (unlikely(res.server_scope == NULL)) {
5352                 status = -ENOMEM;
5353                 goto out_server_owner;
5354         }
5355
5356         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5357         if (unlikely(res.impl_id == NULL)) {
5358                 status = -ENOMEM;
5359                 goto out_server_scope;
5360         }
5361
5362         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5363         if (status == 0)
5364                 status = nfs4_check_cl_exchange_flags(res.flags);
5365
5366         if (status == 0) {
5367                 clp->cl_clientid = res.clientid;
5368                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5369                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5370                         clp->cl_seqid = res.seqid;
5371
5372                 kfree(clp->cl_serverowner);
5373                 clp->cl_serverowner = res.server_owner;
5374                 res.server_owner = NULL;
5375
5376                 /* use the most recent implementation id */
5377                 kfree(clp->cl_implid);
5378                 clp->cl_implid = res.impl_id;
5379
5380                 if (clp->cl_serverscope != NULL &&
5381                     !nfs41_same_server_scope(clp->cl_serverscope,
5382                                              res.server_scope)) {
5383                         dprintk("%s: server_scope mismatch detected\n",
5384                                 __func__);
5385                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5386                         kfree(clp->cl_serverscope);
5387                         clp->cl_serverscope = NULL;
5388                 }
5389
5390                 if (clp->cl_serverscope == NULL) {
5391                         clp->cl_serverscope = res.server_scope;
5392                         goto out;
5393                 }
5394         } else
5395                 kfree(res.impl_id);
5396
5397 out_server_owner:
5398         kfree(res.server_owner);
5399 out_server_scope:
5400         kfree(res.server_scope);
5401 out:
5402         if (clp->cl_implid != NULL)
5403                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5404                         "domain: %s, name: %s, date: %llu,%u\n",
5405                         clp->cl_implid->domain, clp->cl_implid->name,
5406                         clp->cl_implid->date.seconds,
5407                         clp->cl_implid->date.nseconds);
5408         dprintk("NFS reply exchange_id: %d\n", status);
5409         return status;
5410 }
5411
5412 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5413                 struct rpc_cred *cred)
5414 {
5415         struct rpc_message msg = {
5416                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5417                 .rpc_argp = clp,
5418                 .rpc_cred = cred,
5419         };
5420         int status;
5421
5422         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5423         if (status)
5424                 dprintk("NFS: Got error %d from the server %s on "
5425                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5426         return status;
5427 }
5428
5429 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5430                 struct rpc_cred *cred)
5431 {
5432         unsigned int loop;
5433         int ret;
5434
5435         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5436                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5437                 switch (ret) {
5438                 case -NFS4ERR_DELAY:
5439                 case -NFS4ERR_CLIENTID_BUSY:
5440                         ssleep(1);
5441                         break;
5442                 default:
5443                         return ret;
5444                 }
5445         }
5446         return 0;
5447 }
5448
5449 int nfs4_destroy_clientid(struct nfs_client *clp)
5450 {
5451         struct rpc_cred *cred;
5452         int ret = 0;
5453
5454         if (clp->cl_mvops->minor_version < 1)
5455                 goto out;
5456         if (clp->cl_exchange_flags == 0)
5457                 goto out;
5458         if (clp->cl_preserve_clid)
5459                 goto out;
5460         cred = nfs4_get_exchange_id_cred(clp);
5461         ret = nfs4_proc_destroy_clientid(clp, cred);
5462         if (cred)
5463                 put_rpccred(cred);
5464         switch (ret) {
5465         case 0:
5466         case -NFS4ERR_STALE_CLIENTID:
5467                 clp->cl_exchange_flags = 0;
5468         }
5469 out:
5470         return ret;
5471 }
5472
5473 struct nfs4_get_lease_time_data {
5474         struct nfs4_get_lease_time_args *args;
5475         struct nfs4_get_lease_time_res *res;
5476         struct nfs_client *clp;
5477 };
5478
5479 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5480                                         void *calldata)
5481 {
5482         struct nfs4_get_lease_time_data *data =
5483                         (struct nfs4_get_lease_time_data *)calldata;
5484
5485         dprintk("--> %s\n", __func__);
5486         /* just setup sequence, do not trigger session recovery
5487            since we're invoked within one */
5488         nfs41_setup_sequence(data->clp->cl_session,
5489                         &data->args->la_seq_args,
5490                         &data->res->lr_seq_res,
5491                         task);
5492         dprintk("<-- %s\n", __func__);
5493 }
5494
5495 /*
5496  * Called from nfs4_state_manager thread for session setup, so don't recover
5497  * from sequence operation or clientid errors.
5498  */
5499 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5500 {
5501         struct nfs4_get_lease_time_data *data =
5502                         (struct nfs4_get_lease_time_data *)calldata;
5503
5504         dprintk("--> %s\n", __func__);
5505         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5506                 return;
5507         switch (task->tk_status) {
5508         case -NFS4ERR_DELAY:
5509         case -NFS4ERR_GRACE:
5510                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5511                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5512                 task->tk_status = 0;
5513                 /* fall through */
5514         case -NFS4ERR_RETRY_UNCACHED_REP:
5515                 rpc_restart_call_prepare(task);
5516                 return;
5517         }
5518         dprintk("<-- %s\n", __func__);
5519 }
5520
5521 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5522         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5523         .rpc_call_done = nfs4_get_lease_time_done,
5524 };
5525
5526 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5527 {
5528         struct rpc_task *task;
5529         struct nfs4_get_lease_time_args args;
5530         struct nfs4_get_lease_time_res res = {
5531                 .lr_fsinfo = fsinfo,
5532         };
5533         struct nfs4_get_lease_time_data data = {
5534                 .args = &args,
5535                 .res = &res,
5536                 .clp = clp,
5537         };
5538         struct rpc_message msg = {
5539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5540                 .rpc_argp = &args,
5541                 .rpc_resp = &res,
5542         };
5543         struct rpc_task_setup task_setup = {
5544                 .rpc_client = clp->cl_rpcclient,
5545                 .rpc_message = &msg,
5546                 .callback_ops = &nfs4_get_lease_time_ops,
5547                 .callback_data = &data,
5548                 .flags = RPC_TASK_TIMEOUT,
5549         };
5550         int status;
5551
5552         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5553         nfs4_set_sequence_privileged(&args.la_seq_args);
5554         dprintk("--> %s\n", __func__);
5555         task = rpc_run_task(&task_setup);
5556
5557         if (IS_ERR(task))
5558                 status = PTR_ERR(task);
5559         else {
5560                 status = task->tk_status;
5561                 rpc_put_task(task);
5562         }
5563         dprintk("<-- %s return %d\n", __func__, status);
5564
5565         return status;
5566 }
5567
5568 /*
5569  * Initialize the values to be used by the client in CREATE_SESSION
5570  * If nfs4_init_session set the fore channel request and response sizes,
5571  * use them.
5572  *
5573  * Set the back channel max_resp_sz_cached to zero to force the client to
5574  * always set csa_cachethis to FALSE because the current implementation
5575  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5576  */
5577 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5578 {
5579         struct nfs4_session *session = args->client->cl_session;
5580         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5581                      mxresp_sz = session->fc_target_max_resp_sz;
5582
5583         if (mxrqst_sz == 0)
5584                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5585         if (mxresp_sz == 0)
5586                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5587         /* Fore channel attributes */
5588         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5589         args->fc_attrs.max_resp_sz = mxresp_sz;
5590         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5591         args->fc_attrs.max_reqs = max_session_slots;
5592
5593         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5594                 "max_ops=%u max_reqs=%u\n",
5595                 __func__,
5596                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5597                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5598
5599         /* Back channel attributes */
5600         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5601         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5602         args->bc_attrs.max_resp_sz_cached = 0;
5603         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5604         args->bc_attrs.max_reqs = 1;
5605
5606         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5607                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5608                 __func__,
5609                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5610                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5611                 args->bc_attrs.max_reqs);
5612 }
5613
5614 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5615 {
5616         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5617         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5618
5619         if (rcvd->max_resp_sz > sent->max_resp_sz)
5620                 return -EINVAL;
5621         /*
5622          * Our requested max_ops is the minimum we need; we're not
5623          * prepared to break up compounds into smaller pieces than that.
5624          * So, no point even trying to continue if the server won't
5625          * cooperate:
5626          */
5627         if (rcvd->max_ops < sent->max_ops)
5628                 return -EINVAL;
5629         if (rcvd->max_reqs == 0)
5630                 return -EINVAL;
5631         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5632                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5633         return 0;
5634 }
5635
5636 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5637 {
5638         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5639         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5640
5641         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5642                 return -EINVAL;
5643         if (rcvd->max_resp_sz < sent->max_resp_sz)
5644                 return -EINVAL;
5645         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5646                 return -EINVAL;
5647         /* These would render the backchannel useless: */
5648         if (rcvd->max_ops != sent->max_ops)
5649                 return -EINVAL;
5650         if (rcvd->max_reqs != sent->max_reqs)
5651                 return -EINVAL;
5652         return 0;
5653 }
5654
5655 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5656                                      struct nfs4_session *session)
5657 {
5658         int ret;
5659
5660         ret = nfs4_verify_fore_channel_attrs(args, session);
5661         if (ret)
5662                 return ret;
5663         return nfs4_verify_back_channel_attrs(args, session);
5664 }
5665
5666 static int _nfs4_proc_create_session(struct nfs_client *clp,
5667                 struct rpc_cred *cred)
5668 {
5669         struct nfs4_session *session = clp->cl_session;
5670         struct nfs41_create_session_args args = {
5671                 .client = clp,
5672                 .cb_program = NFS4_CALLBACK,
5673         };
5674         struct nfs41_create_session_res res = {
5675                 .client = clp,
5676         };
5677         struct rpc_message msg = {
5678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5679                 .rpc_argp = &args,
5680                 .rpc_resp = &res,
5681                 .rpc_cred = cred,
5682         };
5683         int status;
5684
5685         nfs4_init_channel_attrs(&args);
5686         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5687
5688         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5689
5690         if (!status) {
5691                 /* Verify the session's negotiated channel_attrs values */
5692                 status = nfs4_verify_channel_attrs(&args, session);
5693                 /* Increment the clientid slot sequence id */
5694                 clp->cl_seqid++;
5695         }
5696
5697         return status;
5698 }
5699
5700 /*
5701  * Issues a CREATE_SESSION operation to the server.
5702  * It is the responsibility of the caller to verify the session is
5703  * expired before calling this routine.
5704  */
5705 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5706 {
5707         int status;
5708         unsigned *ptr;
5709         struct nfs4_session *session = clp->cl_session;
5710
5711         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5712
5713         status = _nfs4_proc_create_session(clp, cred);
5714         if (status)
5715                 goto out;
5716
5717         /* Init or reset the session slot tables */
5718         status = nfs4_setup_session_slot_tables(session);
5719         dprintk("slot table setup returned %d\n", status);
5720         if (status)
5721                 goto out;
5722
5723         ptr = (unsigned *)&session->sess_id.data[0];
5724         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5725                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5726 out:
5727         dprintk("<-- %s\n", __func__);
5728         return status;
5729 }
5730
5731 /*
5732  * Issue the over-the-wire RPC DESTROY_SESSION.
5733  * The caller must serialize access to this routine.
5734  */
5735 int nfs4_proc_destroy_session(struct nfs4_session *session,
5736                 struct rpc_cred *cred)
5737 {
5738         struct rpc_message msg = {
5739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5740                 .rpc_argp = session,
5741                 .rpc_cred = cred,
5742         };
5743         int status = 0;
5744
5745         dprintk("--> nfs4_proc_destroy_session\n");
5746
5747         /* session is still being setup */
5748         if (session->clp->cl_cons_state != NFS_CS_READY)
5749                 return status;
5750
5751         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5752
5753         if (status)
5754                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5755                         "Session has been destroyed regardless...\n", status);
5756
5757         dprintk("<-- nfs4_proc_destroy_session\n");
5758         return status;
5759 }
5760
5761 /*
5762  * Renew the cl_session lease.
5763  */
5764 struct nfs4_sequence_data {
5765         struct nfs_client *clp;
5766         struct nfs4_sequence_args args;
5767         struct nfs4_sequence_res res;
5768 };
5769
5770 static void nfs41_sequence_release(void *data)
5771 {
5772         struct nfs4_sequence_data *calldata = data;
5773         struct nfs_client *clp = calldata->clp;
5774
5775         if (atomic_read(&clp->cl_count) > 1)
5776                 nfs4_schedule_state_renewal(clp);
5777         nfs_put_client(clp);
5778         kfree(calldata);
5779 }
5780
5781 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5782 {
5783         switch(task->tk_status) {
5784         case -NFS4ERR_DELAY:
5785                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5786                 return -EAGAIN;
5787         default:
5788                 nfs4_schedule_lease_recovery(clp);
5789         }
5790         return 0;
5791 }
5792
5793 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5794 {
5795         struct nfs4_sequence_data *calldata = data;
5796         struct nfs_client *clp = calldata->clp;
5797
5798         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5799                 return;
5800
5801         if (task->tk_status < 0) {
5802                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5803                 if (atomic_read(&clp->cl_count) == 1)
5804                         goto out;
5805
5806                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5807                         rpc_restart_call_prepare(task);
5808                         return;
5809                 }
5810         }
5811         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5812 out:
5813         dprintk("<-- %s\n", __func__);
5814 }
5815
5816 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5817 {
5818         struct nfs4_sequence_data *calldata = data;
5819         struct nfs_client *clp = calldata->clp;
5820         struct nfs4_sequence_args *args;
5821         struct nfs4_sequence_res *res;
5822
5823         args = task->tk_msg.rpc_argp;
5824         res = task->tk_msg.rpc_resp;
5825
5826         nfs41_setup_sequence(clp->cl_session, args, res, task);
5827 }
5828
5829 static const struct rpc_call_ops nfs41_sequence_ops = {
5830         .rpc_call_done = nfs41_sequence_call_done,
5831         .rpc_call_prepare = nfs41_sequence_prepare,
5832         .rpc_release = nfs41_sequence_release,
5833 };
5834
5835 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5836                 struct rpc_cred *cred,
5837                 bool is_privileged)
5838 {
5839         struct nfs4_sequence_data *calldata;
5840         struct rpc_message msg = {
5841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5842                 .rpc_cred = cred,
5843         };
5844         struct rpc_task_setup task_setup_data = {
5845                 .rpc_client = clp->cl_rpcclient,
5846                 .rpc_message = &msg,
5847                 .callback_ops = &nfs41_sequence_ops,
5848                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5849         };
5850
5851         if (!atomic_inc_not_zero(&clp->cl_count))
5852                 return ERR_PTR(-EIO);
5853         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5854         if (calldata == NULL) {
5855                 nfs_put_client(clp);
5856                 return ERR_PTR(-ENOMEM);
5857         }
5858         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5859         if (is_privileged)
5860                 nfs4_set_sequence_privileged(&calldata->args);
5861         msg.rpc_argp = &calldata->args;
5862         msg.rpc_resp = &calldata->res;
5863         calldata->clp = clp;
5864         task_setup_data.callback_data = calldata;
5865
5866         return rpc_run_task(&task_setup_data);
5867 }
5868
5869 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5870 {
5871         struct rpc_task *task;
5872         int ret = 0;
5873
5874         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5875                 return 0;
5876         task = _nfs41_proc_sequence(clp, cred, false);
5877         if (IS_ERR(task))
5878                 ret = PTR_ERR(task);
5879         else
5880                 rpc_put_task_async(task);
5881         dprintk("<-- %s status=%d\n", __func__, ret);
5882         return ret;
5883 }
5884
5885 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5886 {
5887         struct rpc_task *task;
5888         int ret;
5889
5890         task = _nfs41_proc_sequence(clp, cred, true);
5891         if (IS_ERR(task)) {
5892                 ret = PTR_ERR(task);
5893                 goto out;
5894         }
5895         ret = rpc_wait_for_completion_task(task);
5896         if (!ret) {
5897                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5898
5899                 if (task->tk_status == 0)
5900                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5901                 ret = task->tk_status;
5902         }
5903         rpc_put_task(task);
5904 out:
5905         dprintk("<-- %s status=%d\n", __func__, ret);
5906         return ret;
5907 }
5908
5909 struct nfs4_reclaim_complete_data {
5910         struct nfs_client *clp;
5911         struct nfs41_reclaim_complete_args arg;
5912         struct nfs41_reclaim_complete_res res;
5913 };
5914
5915 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5916 {
5917         struct nfs4_reclaim_complete_data *calldata = data;
5918
5919         nfs41_setup_sequence(calldata->clp->cl_session,
5920                         &calldata->arg.seq_args,
5921                         &calldata->res.seq_res,
5922                         task);
5923 }
5924
5925 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5926 {
5927         switch(task->tk_status) {
5928         case 0:
5929         case -NFS4ERR_COMPLETE_ALREADY:
5930         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5931                 break;
5932         case -NFS4ERR_DELAY:
5933                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5934                 /* fall through */
5935         case -NFS4ERR_RETRY_UNCACHED_REP:
5936                 return -EAGAIN;
5937         default:
5938                 nfs4_schedule_lease_recovery(clp);
5939         }
5940         return 0;
5941 }
5942
5943 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5944 {
5945         struct nfs4_reclaim_complete_data *calldata = data;
5946         struct nfs_client *clp = calldata->clp;
5947         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5948
5949         dprintk("--> %s\n", __func__);
5950         if (!nfs41_sequence_done(task, res))
5951                 return;
5952
5953         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5954                 rpc_restart_call_prepare(task);
5955                 return;
5956         }
5957         dprintk("<-- %s\n", __func__);
5958 }
5959
5960 static void nfs4_free_reclaim_complete_data(void *data)
5961 {
5962         struct nfs4_reclaim_complete_data *calldata = data;
5963
5964         kfree(calldata);
5965 }
5966
5967 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5968         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5969         .rpc_call_done = nfs4_reclaim_complete_done,
5970         .rpc_release = nfs4_free_reclaim_complete_data,
5971 };
5972
5973 /*
5974  * Issue a global reclaim complete.
5975  */
5976 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5977 {
5978         struct nfs4_reclaim_complete_data *calldata;
5979         struct rpc_task *task;
5980         struct rpc_message msg = {
5981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5982         };
5983         struct rpc_task_setup task_setup_data = {
5984                 .rpc_client = clp->cl_rpcclient,
5985                 .rpc_message = &msg,
5986                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5987                 .flags = RPC_TASK_ASYNC,
5988         };
5989         int status = -ENOMEM;
5990
5991         dprintk("--> %s\n", __func__);
5992         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5993         if (calldata == NULL)
5994                 goto out;
5995         calldata->clp = clp;
5996         calldata->arg.one_fs = 0;
5997
5998         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5999         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6000         msg.rpc_argp = &calldata->arg;
6001         msg.rpc_resp = &calldata->res;
6002         task_setup_data.callback_data = calldata;
6003         task = rpc_run_task(&task_setup_data);
6004         if (IS_ERR(task)) {
6005                 status = PTR_ERR(task);
6006                 goto out;
6007         }
6008         status = nfs4_wait_for_completion_rpc_task(task);
6009         if (status == 0)
6010                 status = task->tk_status;
6011         rpc_put_task(task);
6012         return 0;
6013 out:
6014         dprintk("<-- %s status=%d\n", __func__, status);
6015         return status;
6016 }
6017
6018 static void
6019 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6020 {
6021         struct nfs4_layoutget *lgp = calldata;
6022         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6023         struct nfs4_session *session = nfs4_get_session(server);
6024
6025         dprintk("--> %s\n", __func__);
6026         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6027          * right now covering the LAYOUTGET we are about to send.
6028          * However, that is not so catastrophic, and there seems
6029          * to be no way to prevent it completely.
6030          */
6031         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6032                                 &lgp->res.seq_res, task))
6033                 return;
6034         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6035                                           NFS_I(lgp->args.inode)->layout,
6036                                           lgp->args.ctx->state)) {
6037                 rpc_exit(task, NFS4_OK);
6038         }
6039 }
6040
6041 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6042 {
6043         struct nfs4_layoutget *lgp = calldata;
6044         struct inode *inode = lgp->args.inode;
6045         struct nfs_server *server = NFS_SERVER(inode);
6046         struct pnfs_layout_hdr *lo;
6047         struct nfs4_state *state = NULL;
6048
6049         dprintk("--> %s\n", __func__);
6050
6051         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6052                 goto out;
6053
6054         switch (task->tk_status) {
6055         case 0:
6056                 goto out;
6057         case -NFS4ERR_LAYOUTTRYLATER:
6058         case -NFS4ERR_RECALLCONFLICT:
6059                 task->tk_status = -NFS4ERR_DELAY;
6060                 break;
6061         case -NFS4ERR_EXPIRED:
6062         case -NFS4ERR_BAD_STATEID:
6063                 spin_lock(&inode->i_lock);
6064                 lo = NFS_I(inode)->layout;
6065                 if (!lo || list_empty(&lo->plh_segs)) {
6066                         spin_unlock(&inode->i_lock);
6067                         /* If the open stateid was bad, then recover it. */
6068                         state = lgp->args.ctx->state;
6069                 } else {
6070                         LIST_HEAD(head);
6071
6072                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6073                         spin_unlock(&inode->i_lock);
6074                         /* Mark the bad layout state as invalid, then
6075                          * retry using the open stateid. */
6076                         pnfs_free_lseg_list(&head);
6077                 }
6078         }
6079         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6080                 rpc_restart_call_prepare(task);
6081 out:
6082         dprintk("<-- %s\n", __func__);
6083 }
6084
6085 static size_t max_response_pages(struct nfs_server *server)
6086 {
6087         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6088         return nfs_page_array_len(0, max_resp_sz);
6089 }
6090
6091 static void nfs4_free_pages(struct page **pages, size_t size)
6092 {
6093         int i;
6094
6095         if (!pages)
6096                 return;
6097
6098         for (i = 0; i < size; i++) {
6099                 if (!pages[i])
6100                         break;
6101                 __free_page(pages[i]);
6102         }
6103         kfree(pages);
6104 }
6105
6106 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6107 {
6108         struct page **pages;
6109         int i;
6110
6111         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6112         if (!pages) {
6113                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6114                 return NULL;
6115         }
6116
6117         for (i = 0; i < size; i++) {
6118                 pages[i] = alloc_page(gfp_flags);
6119                 if (!pages[i]) {
6120                         dprintk("%s: failed to allocate page\n", __func__);
6121                         nfs4_free_pages(pages, size);
6122                         return NULL;
6123                 }
6124         }
6125
6126         return pages;
6127 }
6128
6129 static void nfs4_layoutget_release(void *calldata)
6130 {
6131         struct nfs4_layoutget *lgp = calldata;
6132         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6133         size_t max_pages = max_response_pages(server);
6134
6135         dprintk("--> %s\n", __func__);
6136         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6137         put_nfs_open_context(lgp->args.ctx);
6138         kfree(calldata);
6139         dprintk("<-- %s\n", __func__);
6140 }
6141
6142 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6143         .rpc_call_prepare = nfs4_layoutget_prepare,
6144         .rpc_call_done = nfs4_layoutget_done,
6145         .rpc_release = nfs4_layoutget_release,
6146 };
6147
6148 struct pnfs_layout_segment *
6149 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6150 {
6151         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6152         size_t max_pages = max_response_pages(server);
6153         struct rpc_task *task;
6154         struct rpc_message msg = {
6155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6156                 .rpc_argp = &lgp->args,
6157                 .rpc_resp = &lgp->res,
6158         };
6159         struct rpc_task_setup task_setup_data = {
6160                 .rpc_client = server->client,
6161                 .rpc_message = &msg,
6162                 .callback_ops = &nfs4_layoutget_call_ops,
6163                 .callback_data = lgp,
6164                 .flags = RPC_TASK_ASYNC,
6165         };
6166         struct pnfs_layout_segment *lseg = NULL;
6167         int status = 0;
6168
6169         dprintk("--> %s\n", __func__);
6170
6171         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6172         if (!lgp->args.layout.pages) {
6173                 nfs4_layoutget_release(lgp);
6174                 return ERR_PTR(-ENOMEM);
6175         }
6176         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6177
6178         lgp->res.layoutp = &lgp->args.layout;
6179         lgp->res.seq_res.sr_slot = NULL;
6180         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6181         task = rpc_run_task(&task_setup_data);
6182         if (IS_ERR(task))
6183                 return ERR_CAST(task);
6184         status = nfs4_wait_for_completion_rpc_task(task);
6185         if (status == 0)
6186                 status = task->tk_status;
6187         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6188         if (status == 0 && lgp->res.layoutp->len)
6189                 lseg = pnfs_layout_process(lgp);
6190         rpc_put_task(task);
6191         dprintk("<-- %s status=%d\n", __func__, status);
6192         if (status)
6193                 return ERR_PTR(status);
6194         return lseg;
6195 }
6196
6197 static void
6198 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6199 {
6200         struct nfs4_layoutreturn *lrp = calldata;
6201
6202         dprintk("--> %s\n", __func__);
6203         nfs41_setup_sequence(lrp->clp->cl_session,
6204                         &lrp->args.seq_args,
6205                         &lrp->res.seq_res,
6206                         task);
6207 }
6208
6209 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6210 {
6211         struct nfs4_layoutreturn *lrp = calldata;
6212         struct nfs_server *server;
6213
6214         dprintk("--> %s\n", __func__);
6215
6216         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6217                 return;
6218
6219         server = NFS_SERVER(lrp->args.inode);
6220         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6221                 rpc_restart_call_prepare(task);
6222                 return;
6223         }
6224         dprintk("<-- %s\n", __func__);
6225 }
6226
6227 static void nfs4_layoutreturn_release(void *calldata)
6228 {
6229         struct nfs4_layoutreturn *lrp = calldata;
6230         struct pnfs_layout_hdr *lo = lrp->args.layout;
6231
6232         dprintk("--> %s\n", __func__);
6233         spin_lock(&lo->plh_inode->i_lock);
6234         if (lrp->res.lrs_present)
6235                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6236         lo->plh_block_lgets--;
6237         spin_unlock(&lo->plh_inode->i_lock);
6238         pnfs_put_layout_hdr(lrp->args.layout);
6239         kfree(calldata);
6240         dprintk("<-- %s\n", __func__);
6241 }
6242
6243 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6244         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6245         .rpc_call_done = nfs4_layoutreturn_done,
6246         .rpc_release = nfs4_layoutreturn_release,
6247 };
6248
6249 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6250 {
6251         struct rpc_task *task;
6252         struct rpc_message msg = {
6253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6254                 .rpc_argp = &lrp->args,
6255                 .rpc_resp = &lrp->res,
6256         };
6257         struct rpc_task_setup task_setup_data = {
6258                 .rpc_client = lrp->clp->cl_rpcclient,
6259                 .rpc_message = &msg,
6260                 .callback_ops = &nfs4_layoutreturn_call_ops,
6261                 .callback_data = lrp,
6262         };
6263         int status;
6264
6265         dprintk("--> %s\n", __func__);
6266         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6267         task = rpc_run_task(&task_setup_data);
6268         if (IS_ERR(task))
6269                 return PTR_ERR(task);
6270         status = task->tk_status;
6271         dprintk("<-- %s status=%d\n", __func__, status);
6272         rpc_put_task(task);
6273         return status;
6274 }
6275
6276 /*
6277  * Retrieve the list of Data Server devices from the MDS.
6278  */
6279 static int _nfs4_getdevicelist(struct nfs_server *server,
6280                                     const struct nfs_fh *fh,
6281                                     struct pnfs_devicelist *devlist)
6282 {
6283         struct nfs4_getdevicelist_args args = {
6284                 .fh = fh,
6285                 .layoutclass = server->pnfs_curr_ld->id,
6286         };
6287         struct nfs4_getdevicelist_res res = {
6288                 .devlist = devlist,
6289         };
6290         struct rpc_message msg = {
6291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6292                 .rpc_argp = &args,
6293                 .rpc_resp = &res,
6294         };
6295         int status;
6296
6297         dprintk("--> %s\n", __func__);
6298         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6299                                 &res.seq_res, 0);
6300         dprintk("<-- %s status=%d\n", __func__, status);
6301         return status;
6302 }
6303
6304 int nfs4_proc_getdevicelist(struct nfs_server *server,
6305                             const struct nfs_fh *fh,
6306                             struct pnfs_devicelist *devlist)
6307 {
6308         struct nfs4_exception exception = { };
6309         int err;
6310
6311         do {
6312                 err = nfs4_handle_exception(server,
6313                                 _nfs4_getdevicelist(server, fh, devlist),
6314                                 &exception);
6315         } while (exception.retry);
6316
6317         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6318                 err, devlist->num_devs);
6319
6320         return err;
6321 }
6322 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6323
6324 static int
6325 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6326 {
6327         struct nfs4_getdeviceinfo_args args = {
6328                 .pdev = pdev,
6329         };
6330         struct nfs4_getdeviceinfo_res res = {
6331                 .pdev = pdev,
6332         };
6333         struct rpc_message msg = {
6334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6335                 .rpc_argp = &args,
6336                 .rpc_resp = &res,
6337         };
6338         int status;
6339
6340         dprintk("--> %s\n", __func__);
6341         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6342         dprintk("<-- %s status=%d\n", __func__, status);
6343
6344         return status;
6345 }
6346
6347 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6348 {
6349         struct nfs4_exception exception = { };
6350         int err;
6351
6352         do {
6353                 err = nfs4_handle_exception(server,
6354                                         _nfs4_proc_getdeviceinfo(server, pdev),
6355                                         &exception);
6356         } while (exception.retry);
6357         return err;
6358 }
6359 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6360
6361 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6362 {
6363         struct nfs4_layoutcommit_data *data = calldata;
6364         struct nfs_server *server = NFS_SERVER(data->args.inode);
6365         struct nfs4_session *session = nfs4_get_session(server);
6366
6367         nfs41_setup_sequence(session,
6368                         &data->args.seq_args,
6369                         &data->res.seq_res,
6370                         task);
6371 }
6372
6373 static void
6374 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6375 {
6376         struct nfs4_layoutcommit_data *data = calldata;
6377         struct nfs_server *server = NFS_SERVER(data->args.inode);
6378
6379         if (!nfs41_sequence_done(task, &data->res.seq_res))
6380                 return;
6381
6382         switch (task->tk_status) { /* Just ignore these failures */
6383         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6384         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6385         case -NFS4ERR_BADLAYOUT:     /* no layout */
6386         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6387                 task->tk_status = 0;
6388                 break;
6389         case 0:
6390                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6391                                                    data->res.fattr);
6392                 break;
6393         default:
6394                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6395                         rpc_restart_call_prepare(task);
6396                         return;
6397                 }
6398         }
6399 }
6400
6401 static void nfs4_layoutcommit_release(void *calldata)
6402 {
6403         struct nfs4_layoutcommit_data *data = calldata;
6404         struct pnfs_layout_segment *lseg, *tmp;
6405         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6406
6407         pnfs_cleanup_layoutcommit(data);
6408         /* Matched by references in pnfs_set_layoutcommit */
6409         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6410                 list_del_init(&lseg->pls_lc_list);
6411                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6412                                        &lseg->pls_flags))
6413                         pnfs_put_lseg(lseg);
6414         }
6415
6416         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6417         smp_mb__after_clear_bit();
6418         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6419
6420         put_rpccred(data->cred);
6421         kfree(data);
6422 }
6423
6424 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6425         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6426         .rpc_call_done = nfs4_layoutcommit_done,
6427         .rpc_release = nfs4_layoutcommit_release,
6428 };
6429
6430 int
6431 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6432 {
6433         struct rpc_message msg = {
6434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6435                 .rpc_argp = &data->args,
6436                 .rpc_resp = &data->res,
6437                 .rpc_cred = data->cred,
6438         };
6439         struct rpc_task_setup task_setup_data = {
6440                 .task = &data->task,
6441                 .rpc_client = NFS_CLIENT(data->args.inode),
6442                 .rpc_message = &msg,
6443                 .callback_ops = &nfs4_layoutcommit_ops,
6444                 .callback_data = data,
6445                 .flags = RPC_TASK_ASYNC,
6446         };
6447         struct rpc_task *task;
6448         int status = 0;
6449
6450         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6451                 "lbw: %llu inode %lu\n",
6452                 data->task.tk_pid, sync,
6453                 data->args.lastbytewritten,
6454                 data->args.inode->i_ino);
6455
6456         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6457         task = rpc_run_task(&task_setup_data);
6458         if (IS_ERR(task))
6459                 return PTR_ERR(task);
6460         if (sync == false)
6461                 goto out;
6462         status = nfs4_wait_for_completion_rpc_task(task);
6463         if (status != 0)
6464                 goto out;
6465         status = task->tk_status;
6466 out:
6467         dprintk("%s: status %d\n", __func__, status);
6468         rpc_put_task(task);
6469         return status;
6470 }
6471
6472 static int
6473 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6474                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6475 {
6476         struct nfs41_secinfo_no_name_args args = {
6477                 .style = SECINFO_STYLE_CURRENT_FH,
6478         };
6479         struct nfs4_secinfo_res res = {
6480                 .flavors = flavors,
6481         };
6482         struct rpc_message msg = {
6483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6484                 .rpc_argp = &args,
6485                 .rpc_resp = &res,
6486         };
6487         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6488 }
6489
6490 static int
6491 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6492                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6493 {
6494         struct nfs4_exception exception = { };
6495         int err;
6496         do {
6497                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6498                 switch (err) {
6499                 case 0:
6500                 case -NFS4ERR_WRONGSEC:
6501                 case -NFS4ERR_NOTSUPP:
6502                         goto out;
6503                 default:
6504                         err = nfs4_handle_exception(server, err, &exception);
6505                 }
6506         } while (exception.retry);
6507 out:
6508         return err;
6509 }
6510
6511 static int
6512 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6513                     struct nfs_fsinfo *info)
6514 {
6515         int err;
6516         struct page *page;
6517         rpc_authflavor_t flavor;
6518         struct nfs4_secinfo_flavors *flavors;
6519
6520         page = alloc_page(GFP_KERNEL);
6521         if (!page) {
6522                 err = -ENOMEM;
6523                 goto out;
6524         }
6525
6526         flavors = page_address(page);
6527         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6528
6529         /*
6530          * Fall back on "guess and check" method if
6531          * the server doesn't support SECINFO_NO_NAME
6532          */
6533         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6534                 err = nfs4_find_root_sec(server, fhandle, info);
6535                 goto out_freepage;
6536         }
6537         if (err)
6538                 goto out_freepage;
6539
6540         flavor = nfs_find_best_sec(flavors);
6541         if (err == 0)
6542                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6543
6544 out_freepage:
6545         put_page(page);
6546         if (err == -EACCES)
6547                 return -EPERM;
6548 out:
6549         return err;
6550 }
6551
6552 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6553 {
6554         int status;
6555         struct nfs41_test_stateid_args args = {
6556                 .stateid = stateid,
6557         };
6558         struct nfs41_test_stateid_res res;
6559         struct rpc_message msg = {
6560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6561                 .rpc_argp = &args,
6562                 .rpc_resp = &res,
6563         };
6564
6565         dprintk("NFS call  test_stateid %p\n", stateid);
6566         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6567         nfs4_set_sequence_privileged(&args.seq_args);
6568         status = nfs4_call_sync_sequence(server->client, server, &msg,
6569                         &args.seq_args, &res.seq_res);
6570         if (status != NFS_OK) {
6571                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6572                 return status;
6573         }
6574         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6575         return -res.status;
6576 }
6577
6578 /**
6579  * nfs41_test_stateid - perform a TEST_STATEID operation
6580  *
6581  * @server: server / transport on which to perform the operation
6582  * @stateid: state ID to test
6583  *
6584  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6585  * Otherwise a negative NFS4ERR value is returned if the operation
6586  * failed or the state ID is not currently valid.
6587  */
6588 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6589 {
6590         struct nfs4_exception exception = { };
6591         int err;
6592         do {
6593                 err = _nfs41_test_stateid(server, stateid);
6594                 if (err != -NFS4ERR_DELAY)
6595                         break;
6596                 nfs4_handle_exception(server, err, &exception);
6597         } while (exception.retry);
6598         return err;
6599 }
6600
6601 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6602 {
6603         struct nfs41_free_stateid_args args = {
6604                 .stateid = stateid,
6605         };
6606         struct nfs41_free_stateid_res res;
6607         struct rpc_message msg = {
6608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6609                 .rpc_argp = &args,
6610                 .rpc_resp = &res,
6611         };
6612         int status;
6613
6614         dprintk("NFS call  free_stateid %p\n", stateid);
6615         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6616         nfs4_set_sequence_privileged(&args.seq_args);
6617         status = nfs4_call_sync_sequence(server->client, server, &msg,
6618                         &args.seq_args, &res.seq_res);
6619         dprintk("NFS reply free_stateid: %d\n", status);
6620         return status;
6621 }
6622
6623 /**
6624  * nfs41_free_stateid - perform a FREE_STATEID operation
6625  *
6626  * @server: server / transport on which to perform the operation
6627  * @stateid: state ID to release
6628  *
6629  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6630  * negative NFS4ERR value is returned.
6631  */
6632 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6633 {
6634         struct nfs4_exception exception = { };
6635         int err;
6636         do {
6637                 err = _nfs4_free_stateid(server, stateid);
6638                 if (err != -NFS4ERR_DELAY)
6639                         break;
6640                 nfs4_handle_exception(server, err, &exception);
6641         } while (exception.retry);
6642         return err;
6643 }
6644
6645 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6646                 const nfs4_stateid *s2)
6647 {
6648         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6649                 return false;
6650
6651         if (s1->seqid == s2->seqid)
6652                 return true;
6653         if (s1->seqid == 0 || s2->seqid == 0)
6654                 return true;
6655
6656         return false;
6657 }
6658
6659 #endif /* CONFIG_NFS_V4_1 */
6660
6661 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6662                 const nfs4_stateid *s2)
6663 {
6664         return nfs4_stateid_match(s1, s2);
6665 }
6666
6667
6668 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6669         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6670         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6671         .recover_open   = nfs4_open_reclaim,
6672         .recover_lock   = nfs4_lock_reclaim,
6673         .establish_clid = nfs4_init_clientid,
6674         .get_clid_cred  = nfs4_get_setclientid_cred,
6675         .detect_trunking = nfs40_discover_server_trunking,
6676 };
6677
6678 #if defined(CONFIG_NFS_V4_1)
6679 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6680         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6681         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6682         .recover_open   = nfs4_open_reclaim,
6683         .recover_lock   = nfs4_lock_reclaim,
6684         .establish_clid = nfs41_init_clientid,
6685         .get_clid_cred  = nfs4_get_exchange_id_cred,
6686         .reclaim_complete = nfs41_proc_reclaim_complete,
6687         .detect_trunking = nfs41_discover_server_trunking,
6688 };
6689 #endif /* CONFIG_NFS_V4_1 */
6690
6691 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6692         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6693         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6694         .recover_open   = nfs4_open_expired,
6695         .recover_lock   = nfs4_lock_expired,
6696         .establish_clid = nfs4_init_clientid,
6697         .get_clid_cred  = nfs4_get_setclientid_cred,
6698 };
6699
6700 #if defined(CONFIG_NFS_V4_1)
6701 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6702         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6703         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6704         .recover_open   = nfs41_open_expired,
6705         .recover_lock   = nfs41_lock_expired,
6706         .establish_clid = nfs41_init_clientid,
6707         .get_clid_cred  = nfs4_get_exchange_id_cred,
6708 };
6709 #endif /* CONFIG_NFS_V4_1 */
6710
6711 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6712         .sched_state_renewal = nfs4_proc_async_renew,
6713         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6714         .renew_lease = nfs4_proc_renew,
6715 };
6716
6717 #if defined(CONFIG_NFS_V4_1)
6718 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6719         .sched_state_renewal = nfs41_proc_async_sequence,
6720         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6721         .renew_lease = nfs4_proc_sequence,
6722 };
6723 #endif
6724
6725 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6726         .minor_version = 0,
6727         .call_sync = _nfs4_call_sync,
6728         .match_stateid = nfs4_match_stateid,
6729         .find_root_sec = nfs4_find_root_sec,
6730         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6731         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6732         .state_renewal_ops = &nfs40_state_renewal_ops,
6733 };
6734
6735 #if defined(CONFIG_NFS_V4_1)
6736 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6737         .minor_version = 1,
6738         .call_sync = nfs4_call_sync_sequence,
6739         .match_stateid = nfs41_match_stateid,
6740         .find_root_sec = nfs41_find_root_sec,
6741         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6742         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6743         .state_renewal_ops = &nfs41_state_renewal_ops,
6744 };
6745 #endif
6746
6747 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6748         [0] = &nfs_v4_0_minor_ops,
6749 #if defined(CONFIG_NFS_V4_1)
6750         [1] = &nfs_v4_1_minor_ops,
6751 #endif
6752 };
6753
6754 const struct inode_operations nfs4_dir_inode_operations = {
6755         .create         = nfs_create,
6756         .lookup         = nfs_lookup,
6757         .atomic_open    = nfs_atomic_open,
6758         .link           = nfs_link,
6759         .unlink         = nfs_unlink,
6760         .symlink        = nfs_symlink,
6761         .mkdir          = nfs_mkdir,
6762         .rmdir          = nfs_rmdir,
6763         .mknod          = nfs_mknod,
6764         .rename         = nfs_rename,
6765         .permission     = nfs_permission,
6766         .getattr        = nfs_getattr,
6767         .setattr        = nfs_setattr,
6768         .getxattr       = generic_getxattr,
6769         .setxattr       = generic_setxattr,
6770         .listxattr      = generic_listxattr,
6771         .removexattr    = generic_removexattr,
6772 };
6773
6774 static const struct inode_operations nfs4_file_inode_operations = {
6775         .permission     = nfs_permission,
6776         .getattr        = nfs_getattr,
6777         .setattr        = nfs_setattr,
6778         .getxattr       = generic_getxattr,
6779         .setxattr       = generic_setxattr,
6780         .listxattr      = generic_listxattr,
6781         .removexattr    = generic_removexattr,
6782 };
6783
6784 const struct nfs_rpc_ops nfs_v4_clientops = {
6785         .version        = 4,                    /* protocol version */
6786         .dentry_ops     = &nfs4_dentry_operations,
6787         .dir_inode_ops  = &nfs4_dir_inode_operations,
6788         .file_inode_ops = &nfs4_file_inode_operations,
6789         .file_ops       = &nfs4_file_operations,
6790         .getroot        = nfs4_proc_get_root,
6791         .submount       = nfs4_submount,
6792         .try_mount      = nfs4_try_mount,
6793         .getattr        = nfs4_proc_getattr,
6794         .setattr        = nfs4_proc_setattr,
6795         .lookup         = nfs4_proc_lookup,
6796         .access         = nfs4_proc_access,
6797         .readlink       = nfs4_proc_readlink,
6798         .create         = nfs4_proc_create,
6799         .remove         = nfs4_proc_remove,
6800         .unlink_setup   = nfs4_proc_unlink_setup,
6801         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6802         .unlink_done    = nfs4_proc_unlink_done,
6803         .rename         = nfs4_proc_rename,
6804         .rename_setup   = nfs4_proc_rename_setup,
6805         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6806         .rename_done    = nfs4_proc_rename_done,
6807         .link           = nfs4_proc_link,
6808         .symlink        = nfs4_proc_symlink,
6809         .mkdir          = nfs4_proc_mkdir,
6810         .rmdir          = nfs4_proc_remove,
6811         .readdir        = nfs4_proc_readdir,
6812         .mknod          = nfs4_proc_mknod,
6813         .statfs         = nfs4_proc_statfs,
6814         .fsinfo         = nfs4_proc_fsinfo,
6815         .pathconf       = nfs4_proc_pathconf,
6816         .set_capabilities = nfs4_server_capabilities,
6817         .decode_dirent  = nfs4_decode_dirent,
6818         .read_setup     = nfs4_proc_read_setup,
6819         .read_pageio_init = pnfs_pageio_init_read,
6820         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6821         .read_done      = nfs4_read_done,
6822         .write_setup    = nfs4_proc_write_setup,
6823         .write_pageio_init = pnfs_pageio_init_write,
6824         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6825         .write_done     = nfs4_write_done,
6826         .commit_setup   = nfs4_proc_commit_setup,
6827         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6828         .commit_done    = nfs4_commit_done,
6829         .lock           = nfs4_proc_lock,
6830         .clear_acl_cache = nfs4_zap_acl_attr,
6831         .close_context  = nfs4_close_context,
6832         .open_context   = nfs4_atomic_open,
6833         .have_delegation = nfs4_have_delegation,
6834         .return_delegation = nfs4_inode_return_delegation,
6835         .alloc_client   = nfs4_alloc_client,
6836         .init_client    = nfs4_init_client,
6837         .free_client    = nfs4_free_client,
6838         .create_server  = nfs4_create_server,
6839         .clone_server   = nfs_clone_server,
6840 };
6841
6842 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6843         .prefix = XATTR_NAME_NFSV4_ACL,
6844         .list   = nfs4_xattr_list_nfs4_acl,
6845         .get    = nfs4_xattr_get_nfs4_acl,
6846         .set    = nfs4_xattr_set_nfs4_acl,
6847 };
6848
6849 const struct xattr_handler *nfs4_xattr_handlers[] = {
6850         &nfs4_xattr_nfs4_acl_handler,
6851         NULL
6852 };
6853
6854 /*
6855  * Local variables:
6856  *  c-basic-offset: 8
6857  * End:
6858  */