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
  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                 case -EKEYEXPIRED:
 337                         ret = nfs4_delay(server->client, &exception->timeout);
 338                         if (ret != 0)
 339                                 break;
 340                 case -NFS4ERR_RETRY_UNCACHED_REP:
 341                 case -NFS4ERR_OLD_STATEID:
 342                         exception->retry = 1;
 343                         break;
 344                 case -NFS4ERR_BADOWNER:
 345                         /* The following works around a Linux server bug! */
 346                 case -NFS4ERR_BADNAME:
 347                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 348                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 349                                 exception->retry = 1;
 350                                 printk(KERN_WARNING "NFS: v4 server %s "
 351                                                 "does not accept raw "
 352                                                 "uid/gids. "
 353                                                 "Reenabling the idmapper.\n",
 354                                                 server->nfs_client->cl_hostname);
 355                         }
 356         }
 357         /* We failed to handle the error */
 358         return nfs4_map_errors(ret);
 359 wait_on_recovery:
 360         ret = nfs4_wait_clnt_recover(clp);
 361         if (ret == 0)
 362                 exception->retry = 1;
 363         return ret;
 364 }
 365
 366
 367 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 368 {
 369         spin_lock(&clp->cl_lock);
 370         if (time_before(clp->cl_last_renewal,timestamp))
 371                 clp->cl_last_renewal = timestamp;
 372         spin_unlock(&clp->cl_lock);
 373 }
 374
 375 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 376 {
 377         do_renew_lease(server->nfs_client, timestamp);
 378 }
 379
 380 #if defined(CONFIG_NFS_V4_1)
 381
 382 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 383 {
 384         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 385         return true;
 386 }
 387
 388 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 389 {
 390         struct nfs4_session *session;
 391         struct nfs4_slot_table *tbl;
 392         bool send_new_highest_used_slotid = false;
 393
 394         if (!res->sr_slot) {
 395                 /* just wake up the next guy waiting since
 396                  * we may have not consumed a slot after all */
 397                 dprintk("%s: No slot\n", __func__);
 398                 return;
 399         }
 400         tbl = res->sr_slot->table;
 401         session = tbl->session;
 402
 403         spin_lock(&tbl->slot_tbl_lock);
 404         /* Be nice to the server: try to ensure that the last transmitted
 405          * value for highest_user_slotid <= target_highest_slotid
 406          */
 407         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 408                 send_new_highest_used_slotid = true;
 409
 410         nfs4_free_slot(tbl, res->sr_slot);
 411
 412         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 413                 send_new_highest_used_slotid = false;
 414         if (!nfs4_session_draining(session)) {
 415                 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
 416                                 nfs4_set_task_privileged, NULL) != NULL)
 417                         send_new_highest_used_slotid = false;
 418         }
 419         spin_unlock(&tbl->slot_tbl_lock);
 420         res->sr_slot = NULL;
 421         if (send_new_highest_used_slotid)
 422                 nfs41_server_notify_highest_slotid_update(session->clp);
 423 }
 424
 425 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 426 {
 427         struct nfs4_session *session;
 428         struct nfs4_slot *slot;
 429         unsigned long timestamp;
 430         struct nfs_client *clp;
 431
 432         /*
 433          * sr_status remains 1 if an RPC level error occurred. The server
 434          * may or may not have processed the sequence operation..
 435          * Proceed as if the server received and processed the sequence
 436          * operation.
 437          */
 438         if (res->sr_status == 1)
 439                 res->sr_status = NFS_OK;
 440
 441         /* don't increment the sequence number if the task wasn't sent */
 442         if (!RPC_WAS_SENT(task))
 443                 goto out;
 444
 445         slot = res->sr_slot;
 446         session = slot->table->session;
 447
 448         /* Check the SEQUENCE operation status */
 449         switch (res->sr_status) {
 450         case 0:
 451                 /* Update the slot's sequence and clientid lease timer */
 452                 ++slot->seq_nr;
 453                 timestamp = slot->renewal_time;
 454                 clp = session->clp;
 455                 do_renew_lease(clp, timestamp);
 456                 /* Check sequence flags */
 457                 if (res->sr_status_flags != 0)
 458                         nfs4_schedule_lease_recovery(clp);
 459                 nfs41_update_target_slotid(slot->table, slot, res);
 460                 break;
 461         case -NFS4ERR_DELAY:
 462                 /* The server detected a resend of the RPC call and
 463                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 464                  * of RFC5661.
 465                  */
 466                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 467                         __func__,
 468                         slot->slot_nr,
 469                         slot->seq_nr);
 470                 goto out_retry;
 471         default:
 472                 /* Just update the slot sequence no. */
 473                 ++slot->seq_nr;
 474         }
 475 out:
 476         /* The session may be reset by one of the error handlers. */
 477         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 478         nfs41_sequence_free_slot(res);
 479         return 1;
 480 out_retry:
 481         if (!rpc_restart_call(task))
 482                 goto out;
 483         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 484         return 0;
 485 }
 486
 487 static int nfs4_sequence_done(struct rpc_task *task,
 488                                struct nfs4_sequence_res *res)
 489 {
 490         if (res->sr_slot == NULL)
 491                 return 1;
 492         return nfs41_sequence_done(task, res);
 493 }
 494
 495 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 496                 struct nfs4_sequence_res *res, int cache_reply)
 497 {
 498         args->sa_slot = NULL;
 499         args->sa_cache_this = 0;
 500         if (cache_reply)
 501                 args->sa_cache_this = 1;
 502         res->sr_slot = NULL;
 503 }
 504
 505 int nfs41_setup_sequence(struct nfs4_session *session,
 506                                 struct nfs4_sequence_args *args,
 507                                 struct nfs4_sequence_res *res,
 508                                 struct rpc_task *task)
 509 {
 510         struct nfs4_slot *slot;
 511         struct nfs4_slot_table *tbl;
 512
 513         dprintk("--> %s\n", __func__);
 514         /* slot already allocated? */
 515         if (res->sr_slot != NULL)
 516                 goto out_success;
 517
 518         tbl = &session->fc_slot_table;
 519
 520         task->tk_timeout = 0;
 521
 522         spin_lock(&tbl->slot_tbl_lock);
 523         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 524             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 525                 /* The state manager will wait until the slot table is empty */
 526                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 527                 spin_unlock(&tbl->slot_tbl_lock);
 528                 dprintk("%s session is draining\n", __func__);
 529                 return -EAGAIN;
 530         }
 531
 532         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 533             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535                 spin_unlock(&tbl->slot_tbl_lock);
 536                 dprintk("%s enforce FIFO order\n", __func__);
 537                 return -EAGAIN;
 538         }
 539
 540         slot = nfs4_alloc_slot(tbl);
 541         if (IS_ERR(slot)) {
 542                 /* If out of memory, try again in 1/4 second */
 543                 if (slot == ERR_PTR(-ENOMEM))
 544                         task->tk_timeout = HZ >> 2;
 545                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 546                 spin_unlock(&tbl->slot_tbl_lock);
 547                 dprintk("<-- %s: no free slots\n", __func__);
 548                 return -EAGAIN;
 549         }
 550         spin_unlock(&tbl->slot_tbl_lock);
 551
 552         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 553
 554         args->sa_slot = slot;
 555
 556         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 557                         slot->slot_nr, slot->seq_nr);
 558
 559         res->sr_slot = slot;
 560         res->sr_status_flags = 0;
 561         /*
 562          * sr_status is only set in decode_sequence, and so will remain
 563          * set to 1 if an rpc level failure occurs.
 564          */
 565         res->sr_status = 1;
 566 out_success:
 567         rpc_call_start(task);
 568         return 0;
 569 }
 570 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 571
 572 int nfs4_setup_sequence(const struct nfs_server *server,
 573                         struct nfs4_sequence_args *args,
 574                         struct nfs4_sequence_res *res,
 575                         struct rpc_task *task)
 576 {
 577         struct nfs4_session *session = nfs4_get_session(server);
 578         int ret = 0;
 579
 580         if (session == NULL) {
 581                 rpc_call_start(task);
 582                 goto out;
 583         }
 584
 585         dprintk("--> %s clp %p session %p sr_slot %d\n",
 586                 __func__, session->clp, session, res->sr_slot ?
 587                         res->sr_slot->slot_nr : -1);
 588
 589         ret = nfs41_setup_sequence(session, args, res, task);
 590 out:
 591         dprintk("<-- %s status=%d\n", __func__, ret);
 592         return ret;
 593 }
 594
 595 struct nfs41_call_sync_data {
 596         const struct nfs_server *seq_server;
 597         struct nfs4_sequence_args *seq_args;
 598         struct nfs4_sequence_res *seq_res;
 599 };
 600
 601 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 602 {
 603         struct nfs41_call_sync_data *data = calldata;
 604         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 605
 606         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 607
 608         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 609 }
 610
 611 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 612 {
 613         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 614         nfs41_call_sync_prepare(task, calldata);
 615 }
 616
 617 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 618 {
 619         struct nfs41_call_sync_data *data = calldata;
 620
 621         nfs41_sequence_done(task, data->seq_res);
 622 }
 623
 624 static const struct rpc_call_ops nfs41_call_sync_ops = {
 625         .rpc_call_prepare = nfs41_call_sync_prepare,
 626         .rpc_call_done = nfs41_call_sync_done,
 627 };
 628
 629 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 630         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 631         .rpc_call_done = nfs41_call_sync_done,
 632 };
 633
 634 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 635                                    struct nfs_server *server,
 636                                    struct rpc_message *msg,
 637                                    struct nfs4_sequence_args *args,
 638                                    struct nfs4_sequence_res *res,
 639                                    int privileged)
 640 {
 641         int ret;
 642         struct rpc_task *task;
 643         struct nfs41_call_sync_data data = {
 644                 .seq_server = server,
 645                 .seq_args = args,
 646                 .seq_res = res,
 647         };
 648         struct rpc_task_setup task_setup = {
 649                 .rpc_client = clnt,
 650                 .rpc_message = msg,
 651                 .callback_ops = &nfs41_call_sync_ops,
 652                 .callback_data = &data
 653         };
 654
 655         if (privileged)
 656                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 657         task = rpc_run_task(&task_setup);
 658         if (IS_ERR(task))
 659                 ret = PTR_ERR(task);
 660         else {
 661                 ret = task->tk_status;
 662                 rpc_put_task(task);
 663         }
 664         return ret;
 665 }
 666
 667 static
 668 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 669                             struct nfs_server *server,
 670                             struct rpc_message *msg,
 671                             struct nfs4_sequence_args *args,
 672                             struct nfs4_sequence_res *res)
 673 {
 674         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 675 }
 676
 677 #else
 678 static inline
 679 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 680                 struct nfs4_sequence_res *res, int cache_reply)
 681 {
 682 }
 683
 684 static int nfs4_sequence_done(struct rpc_task *task,
 685                                struct nfs4_sequence_res *res)
 686 {
 687         return 1;
 688 }
 689 #endif /* CONFIG_NFS_V4_1 */
 690
 691 static
 692 int _nfs4_call_sync(struct rpc_clnt *clnt,
 693                     struct nfs_server *server,
 694                     struct rpc_message *msg,
 695                     struct nfs4_sequence_args *args,
 696                     struct nfs4_sequence_res *res)
 697 {
 698         return rpc_call_sync(clnt, msg, 0);
 699 }
 700
 701 static
 702 int nfs4_call_sync(struct rpc_clnt *clnt,
 703                    struct nfs_server *server,
 704                    struct rpc_message *msg,
 705                    struct nfs4_sequence_args *args,
 706                    struct nfs4_sequence_res *res,
 707                    int cache_reply)
 708 {
 709         nfs41_init_sequence(args, res, cache_reply);
 710         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 711                                                 args, res);
 712 }
 713
 714 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 715 {
 716         struct nfs_inode *nfsi = NFS_I(dir);
 717
 718         spin_lock(&dir->i_lock);
 719         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 720         if (!cinfo->atomic || cinfo->before != dir->i_version)
 721                 nfs_force_lookup_revalidate(dir);
 722         dir->i_version = cinfo->after;
 723         spin_unlock(&dir->i_lock);
 724 }
 725
 726 struct nfs4_opendata {
 727         struct kref kref;
 728         struct nfs_openargs o_arg;
 729         struct nfs_openres o_res;
 730         struct nfs_open_confirmargs c_arg;
 731         struct nfs_open_confirmres c_res;
 732         struct nfs4_string owner_name;
 733         struct nfs4_string group_name;
 734         struct nfs_fattr f_attr;
 735         struct dentry *dir;
 736         struct dentry *dentry;
 737         struct nfs4_state_owner *owner;
 738         struct nfs4_state *state;
 739         struct iattr attrs;
 740         unsigned long timestamp;
 741         unsigned int rpc_done : 1;
 742         int rpc_status;
 743         int cancelled;
 744 };
 745
 746
 747 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 748 {
 749         p->o_res.f_attr = &p->f_attr;
 750         p->o_res.seqid = p->o_arg.seqid;
 751         p->c_res.seqid = p->c_arg.seqid;
 752         p->o_res.server = p->o_arg.server;
 753         p->o_res.access_request = p->o_arg.access;
 754         nfs_fattr_init(&p->f_attr);
 755         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 756 }
 757
 758 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 759                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 760                 const struct iattr *attrs,
 761                 gfp_t gfp_mask)
 762 {
 763         struct dentry *parent = dget_parent(dentry);
 764         struct inode *dir = parent->d_inode;
 765         struct nfs_server *server = NFS_SERVER(dir);
 766         struct nfs4_opendata *p;
 767
 768         p = kzalloc(sizeof(*p), gfp_mask);
 769         if (p == NULL)
 770                 goto err;
 771         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 772         if (p->o_arg.seqid == NULL)
 773                 goto err_free;
 774         nfs_sb_active(dentry->d_sb);
 775         p->dentry = dget(dentry);
 776         p->dir = parent;
 777         p->owner = sp;
 778         atomic_inc(&sp->so_count);
 779         p->o_arg.fh = NFS_FH(dir);
 780         p->o_arg.open_flags = flags;
 781         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 782         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 783          * will return permission denied for all bits until close */
 784         if (!(flags & O_EXCL)) {
 785                 /* ask server to check for all possible rights as results
 786                  * are cached */
 787                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 788                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 789         }
 790         p->o_arg.clientid = server->nfs_client->cl_clientid;
 791         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 792         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 793         p->o_arg.name = &dentry->d_name;
 794         p->o_arg.server = server;
 795         p->o_arg.bitmask = server->attr_bitmask;
 796         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 797         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 798         if (attrs != NULL && attrs->ia_valid != 0) {
 799                 __be32 verf[2];
 800
 801                 p->o_arg.u.attrs = &p->attrs;
 802                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 803
 804                 verf[0] = jiffies;
 805                 verf[1] = current->pid;
 806                 memcpy(p->o_arg.u.verifier.data, verf,
 807                                 sizeof(p->o_arg.u.verifier.data));
 808         }
 809         p->c_arg.fh = &p->o_res.fh;
 810         p->c_arg.stateid = &p->o_res.stateid;
 811         p->c_arg.seqid = p->o_arg.seqid;
 812         nfs4_init_opendata_res(p);
 813         kref_init(&p->kref);
 814         return p;
 815 err_free:
 816         kfree(p);
 817 err:
 818         dput(parent);
 819         return NULL;
 820 }
 821
 822 static void nfs4_opendata_free(struct kref *kref)
 823 {
 824         struct nfs4_opendata *p = container_of(kref,
 825                         struct nfs4_opendata, kref);
 826         struct super_block *sb = p->dentry->d_sb;
 827
 828         nfs_free_seqid(p->o_arg.seqid);
 829         if (p->state != NULL)
 830                 nfs4_put_open_state(p->state);
 831         nfs4_put_state_owner(p->owner);
 832         dput(p->dir);
 833         dput(p->dentry);
 834         nfs_sb_deactive(sb);
 835         nfs_fattr_free_names(&p->f_attr);
 836         kfree(p);
 837 }
 838
 839 static void nfs4_opendata_put(struct nfs4_opendata *p)
 840 {
 841         if (p != NULL)
 842                 kref_put(&p->kref, nfs4_opendata_free);
 843 }
 844
 845 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 846 {
 847         int ret;
 848
 849         ret = rpc_wait_for_completion_task(task);
 850         return ret;
 851 }
 852
 853 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 854 {
 855         int ret = 0;
 856
 857         if (open_mode & (O_EXCL|O_TRUNC))
 858                 goto out;
 859         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 860                 case FMODE_READ:
 861                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 862                                 && state->n_rdonly != 0;
 863                         break;
 864                 case FMODE_WRITE:
 865                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 866                                 && state->n_wronly != 0;
 867                         break;
 868                 case FMODE_READ|FMODE_WRITE:
 869                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 870                                 && state->n_rdwr != 0;
 871         }
 872 out:
 873         return ret;
 874 }
 875
 876 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 877 {
 878         if (delegation == NULL)
 879                 return 0;
 880         if ((delegation->type & fmode) != fmode)
 881                 return 0;
 882         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 883                 return 0;
 884         nfs_mark_delegation_referenced(delegation);
 885         return 1;
 886 }
 887
 888 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 889 {
 890         switch (fmode) {
 891                 case FMODE_WRITE:
 892                         state->n_wronly++;
 893                         break;
 894                 case FMODE_READ:
 895                         state->n_rdonly++;
 896                         break;
 897                 case FMODE_READ|FMODE_WRITE:
 898                         state->n_rdwr++;
 899         }
 900         nfs4_state_set_mode_locked(state, state->state | fmode);
 901 }
 902
 903 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 904 {
 905         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 906                 nfs4_stateid_copy(&state->stateid, stateid);
 907         nfs4_stateid_copy(&state->open_stateid, stateid);
 908         switch (fmode) {
 909                 case FMODE_READ:
 910                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 911                         break;
 912                 case FMODE_WRITE:
 913                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 914                         break;
 915                 case FMODE_READ|FMODE_WRITE:
 916                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 917         }
 918 }
 919
 920 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 921 {
 922         write_seqlock(&state->seqlock);
 923         nfs_set_open_stateid_locked(state, stateid, fmode);
 924         write_sequnlock(&state->seqlock);
 925 }
 926
 927 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 928 {
 929         /*
 930          * Protect the call to nfs4_state_set_mode_locked and
 931          * serialise the stateid update
 932          */
 933         write_seqlock(&state->seqlock);
 934         if (deleg_stateid != NULL) {
 935                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 936                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 937         }
 938         if (open_stateid != NULL)
 939                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 940         write_sequnlock(&state->seqlock);
 941         spin_lock(&state->owner->so_lock);
 942         update_open_stateflags(state, fmode);
 943         spin_unlock(&state->owner->so_lock);
 944 }
 945
 946 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 947 {
 948         struct nfs_inode *nfsi = NFS_I(state->inode);
 949         struct nfs_delegation *deleg_cur;
 950         int ret = 0;
 951
 952         fmode &= (FMODE_READ|FMODE_WRITE);
 953
 954         rcu_read_lock();
 955         deleg_cur = rcu_dereference(nfsi->delegation);
 956         if (deleg_cur == NULL)
 957                 goto no_delegation;
 958
 959         spin_lock(&deleg_cur->lock);
 960         if (nfsi->delegation != deleg_cur ||
 961             (deleg_cur->type & fmode) != fmode)
 962                 goto no_delegation_unlock;
 963
 964         if (delegation == NULL)
 965                 delegation = &deleg_cur->stateid;
 966         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 967                 goto no_delegation_unlock;
 968
 969         nfs_mark_delegation_referenced(deleg_cur);
 970         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 971         ret = 1;
 972 no_delegation_unlock:
 973         spin_unlock(&deleg_cur->lock);
 974 no_delegation:
 975         rcu_read_unlock();
 976
 977         if (!ret && open_stateid != NULL) {
 978                 __update_open_stateid(state, open_stateid, NULL, fmode);
 979                 ret = 1;
 980         }
 981
 982         return ret;
 983 }
 984
 985
 986 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 987 {
 988         struct nfs_delegation *delegation;
 989
 990         rcu_read_lock();
 991         delegation = rcu_dereference(NFS_I(inode)->delegation);
 992         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 993                 rcu_read_unlock();
 994                 return;
 995         }
 996         rcu_read_unlock();
 997         nfs4_inode_return_delegation(inode);
 998 }
 999
1000 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1001 {
1002         struct nfs4_state *state = opendata->state;
1003         struct nfs_inode *nfsi = NFS_I(state->inode);
1004         struct nfs_delegation *delegation;
1005         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1006         fmode_t fmode = opendata->o_arg.fmode;
1007         nfs4_stateid stateid;
1008         int ret = -EAGAIN;
1009
1010         for (;;) {
1011                 if (can_open_cached(state, fmode, open_mode)) {
1012                         spin_lock(&state->owner->so_lock);
1013                         if (can_open_cached(state, fmode, open_mode)) {
1014                                 update_open_stateflags(state, fmode);
1015                                 spin_unlock(&state->owner->so_lock);
1016                                 goto out_return_state;
1017                         }
1018                         spin_unlock(&state->owner->so_lock);
1019                 }
1020                 rcu_read_lock();
1021                 delegation = rcu_dereference(nfsi->delegation);
1022                 if (!can_open_delegated(delegation, fmode)) {
1023                         rcu_read_unlock();
1024                         break;
1025                 }
1026                 /* Save the delegation */
1027                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1028                 rcu_read_unlock();
1029                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1030                 if (ret != 0)
1031                         goto out;
1032                 ret = -EAGAIN;
1033
1034                 /* Try to update the stateid using the delegation */
1035                 if (update_open_stateid(state, NULL, &stateid, fmode))
1036                         goto out_return_state;
1037         }
1038 out:
1039         return ERR_PTR(ret);
1040 out_return_state:
1041         atomic_inc(&state->count);
1042         return state;
1043 }
1044
1045 static void
1046 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1047 {
1048         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1049         struct nfs_delegation *delegation;
1050         int delegation_flags = 0;
1051
1052         rcu_read_lock();
1053         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1054         if (delegation)
1055                 delegation_flags = delegation->flags;
1056         rcu_read_unlock();
1057         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1058                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1059                                    "returning a delegation for "
1060                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1061                                    clp->cl_hostname);
1062         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1063                 nfs_inode_set_delegation(state->inode,
1064                                          data->owner->so_cred,
1065                                          &data->o_res);
1066         else
1067                 nfs_inode_reclaim_delegation(state->inode,
1068                                              data->owner->so_cred,
1069                                              &data->o_res);
1070 }
1071
1072 /*
1073  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1074  * and update the nfs4_state.
1075  */
1076 static struct nfs4_state *
1077 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1078 {
1079         struct inode *inode = data->state->inode;
1080         struct nfs4_state *state = data->state;
1081         int ret;
1082
1083         if (!data->rpc_done) {
1084                 ret = data->rpc_status;
1085                 goto err;
1086         }
1087
1088         ret = -ESTALE;
1089         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1090             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1091             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1092                 goto err;
1093
1094         ret = -ENOMEM;
1095         state = nfs4_get_open_state(inode, data->owner);
1096         if (state == NULL)
1097                 goto err;
1098
1099         ret = nfs_refresh_inode(inode, &data->f_attr);
1100         if (ret)
1101                 goto err;
1102
1103         if (data->o_res.delegation_type != 0)
1104                 nfs4_opendata_check_deleg(data, state);
1105         update_open_stateid(state, &data->o_res.stateid, NULL,
1106                             data->o_arg.fmode);
1107
1108         return state;
1109 err:
1110         return ERR_PTR(ret);
1111
1112 }
1113
1114 static struct nfs4_state *
1115 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1116 {
1117         struct inode *inode;
1118         struct nfs4_state *state = NULL;
1119         int ret;
1120
1121         if (!data->rpc_done) {
1122                 state = nfs4_try_open_cached(data);
1123                 goto out;
1124         }
1125
1126         ret = -EAGAIN;
1127         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1128                 goto err;
1129         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1130         ret = PTR_ERR(inode);
1131         if (IS_ERR(inode))
1132                 goto err;
1133         ret = -ENOMEM;
1134         state = nfs4_get_open_state(inode, data->owner);
1135         if (state == NULL)
1136                 goto err_put_inode;
1137         if (data->o_res.delegation_type != 0)
1138                 nfs4_opendata_check_deleg(data, state);
1139         update_open_stateid(state, &data->o_res.stateid, NULL,
1140                         data->o_arg.fmode);
1141         iput(inode);
1142 out:
1143         return state;
1144 err_put_inode:
1145         iput(inode);
1146 err:
1147         return ERR_PTR(ret);
1148 }
1149
1150 static struct nfs4_state *
1151 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1152 {
1153         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1154                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1155         return _nfs4_opendata_to_nfs4_state(data);
1156 }
1157
1158 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1159 {
1160         struct nfs_inode *nfsi = NFS_I(state->inode);
1161         struct nfs_open_context *ctx;
1162
1163         spin_lock(&state->inode->i_lock);
1164         list_for_each_entry(ctx, &nfsi->open_files, list) {
1165                 if (ctx->state != state)
1166                         continue;
1167                 get_nfs_open_context(ctx);
1168                 spin_unlock(&state->inode->i_lock);
1169                 return ctx;
1170         }
1171         spin_unlock(&state->inode->i_lock);
1172         return ERR_PTR(-ENOENT);
1173 }
1174
1175 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1176 {
1177         struct nfs4_opendata *opendata;
1178
1179         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1180         if (opendata == NULL)
1181                 return ERR_PTR(-ENOMEM);
1182         opendata->state = state;
1183         atomic_inc(&state->count);
1184         return opendata;
1185 }
1186
1187 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1188 {
1189         struct nfs4_state *newstate;
1190         int ret;
1191
1192         opendata->o_arg.open_flags = 0;
1193         opendata->o_arg.fmode = fmode;
1194         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1195         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1196         nfs4_init_opendata_res(opendata);
1197         ret = _nfs4_recover_proc_open(opendata);
1198         if (ret != 0)
1199                 return ret;
1200         newstate = nfs4_opendata_to_nfs4_state(opendata);
1201         if (IS_ERR(newstate))
1202                 return PTR_ERR(newstate);
1203         nfs4_close_state(newstate, fmode);
1204         *res = newstate;
1205         return 0;
1206 }
1207
1208 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1209 {
1210         struct nfs4_state *newstate;
1211         int ret;
1212
1213         /* memory barrier prior to reading state->n_* */
1214         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1215         smp_rmb();
1216         if (state->n_rdwr != 0) {
1217                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1218                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1219                 if (ret != 0)
1220                         return ret;
1221                 if (newstate != state)
1222                         return -ESTALE;
1223         }
1224         if (state->n_wronly != 0) {
1225                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1227                 if (ret != 0)
1228                         return ret;
1229                 if (newstate != state)
1230                         return -ESTALE;
1231         }
1232         if (state->n_rdonly != 0) {
1233                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1234                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1235                 if (ret != 0)
1236                         return ret;
1237                 if (newstate != state)
1238                         return -ESTALE;
1239         }
1240         /*
1241          * We may have performed cached opens for all three recoveries.
1242          * Check if we need to update the current stateid.
1243          */
1244         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1245             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1246                 write_seqlock(&state->seqlock);
1247                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1248                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1249                 write_sequnlock(&state->seqlock);
1250         }
1251         return 0;
1252 }
1253
1254 /*
1255  * OPEN_RECLAIM:
1256  *      reclaim state on the server after a reboot.
1257  */
1258 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1259 {
1260         struct nfs_delegation *delegation;
1261         struct nfs4_opendata *opendata;
1262         fmode_t delegation_type = 0;
1263         int status;
1264
1265         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1266         if (IS_ERR(opendata))
1267                 return PTR_ERR(opendata);
1268         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1269         opendata->o_arg.fh = NFS_FH(state->inode);
1270         rcu_read_lock();
1271         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1272         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1273                 delegation_type = delegation->type;
1274         rcu_read_unlock();
1275         opendata->o_arg.u.delegation_type = delegation_type;
1276         status = nfs4_open_recover(opendata, state);
1277         nfs4_opendata_put(opendata);
1278         return status;
1279 }
1280
1281 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1282 {
1283         struct nfs_server *server = NFS_SERVER(state->inode);
1284         struct nfs4_exception exception = { };
1285         int err;
1286         do {
1287                 err = _nfs4_do_open_reclaim(ctx, state);
1288                 if (err != -NFS4ERR_DELAY)
1289                         break;
1290                 nfs4_handle_exception(server, err, &exception);
1291         } while (exception.retry);
1292         return err;
1293 }
1294
1295 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1296 {
1297         struct nfs_open_context *ctx;
1298         int ret;
1299
1300         ctx = nfs4_state_find_open_context(state);
1301         if (IS_ERR(ctx))
1302                 return PTR_ERR(ctx);
1303         ret = nfs4_do_open_reclaim(ctx, state);
1304         put_nfs_open_context(ctx);
1305         return ret;
1306 }
1307
1308 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1309 {
1310         struct nfs4_opendata *opendata;
1311         int ret;
1312
1313         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1314         if (IS_ERR(opendata))
1315                 return PTR_ERR(opendata);
1316         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1317         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1318         ret = nfs4_open_recover(opendata, state);
1319         nfs4_opendata_put(opendata);
1320         return ret;
1321 }
1322
1323 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1324 {
1325         struct nfs4_exception exception = { };
1326         struct nfs_server *server = NFS_SERVER(state->inode);
1327         int err;
1328         do {
1329                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1330                 switch (err) {
1331                         case 0:
1332                         case -ENOENT:
1333                         case -ESTALE:
1334                                 goto out;
1335                         case -NFS4ERR_BADSESSION:
1336                         case -NFS4ERR_BADSLOT:
1337                         case -NFS4ERR_BAD_HIGH_SLOT:
1338                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1339                         case -NFS4ERR_DEADSESSION:
1340                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1341                                 goto out;
1342                         case -NFS4ERR_STALE_CLIENTID:
1343                         case -NFS4ERR_STALE_STATEID:
1344                         case -NFS4ERR_EXPIRED:
1345                                 /* Don't recall a delegation if it was lost */
1346                                 nfs4_schedule_lease_recovery(server->nfs_client);
1347                                 goto out;
1348                         case -ERESTARTSYS:
1349                                 /*
1350                                  * The show must go on: exit, but mark the
1351                                  * stateid as needing recovery.
1352                                  */
1353                         case -NFS4ERR_DELEG_REVOKED:
1354                         case -NFS4ERR_ADMIN_REVOKED:
1355                         case -NFS4ERR_BAD_STATEID:
1356                                 nfs_inode_find_state_and_recover(state->inode,
1357                                                 stateid);
1358                                 nfs4_schedule_stateid_recovery(server, state);
1359                         case -EKEYEXPIRED:
1360                                 /*
1361                                  * User RPCSEC_GSS context has expired.
1362                                  * We cannot recover this stateid now, so
1363                                  * skip it and allow recovery thread to
1364                                  * proceed.
1365                                  */
1366                         case -ENOMEM:
1367                                 err = 0;
1368                                 goto out;
1369                 }
1370                 err = nfs4_handle_exception(server, err, &exception);
1371         } while (exception.retry);
1372 out:
1373         return err;
1374 }
1375
1376 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1377 {
1378         struct nfs4_opendata *data = calldata;
1379
1380         data->rpc_status = task->tk_status;
1381         if (data->rpc_status == 0) {
1382                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1383                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1384                 renew_lease(data->o_res.server, data->timestamp);
1385                 data->rpc_done = 1;
1386         }
1387 }
1388
1389 static void nfs4_open_confirm_release(void *calldata)
1390 {
1391         struct nfs4_opendata *data = calldata;
1392         struct nfs4_state *state = NULL;
1393
1394         /* If this request hasn't been cancelled, do nothing */
1395         if (data->cancelled == 0)
1396                 goto out_free;
1397         /* In case of error, no cleanup! */
1398         if (!data->rpc_done)
1399                 goto out_free;
1400         state = nfs4_opendata_to_nfs4_state(data);
1401         if (!IS_ERR(state))
1402                 nfs4_close_state(state, data->o_arg.fmode);
1403 out_free:
1404         nfs4_opendata_put(data);
1405 }
1406
1407 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1408         .rpc_call_done = nfs4_open_confirm_done,
1409         .rpc_release = nfs4_open_confirm_release,
1410 };
1411
1412 /*
1413  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1414  */
1415 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1416 {
1417         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1418         struct rpc_task *task;
1419         struct  rpc_message msg = {
1420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1421                 .rpc_argp = &data->c_arg,
1422                 .rpc_resp = &data->c_res,
1423                 .rpc_cred = data->owner->so_cred,
1424         };
1425         struct rpc_task_setup task_setup_data = {
1426                 .rpc_client = server->client,
1427                 .rpc_message = &msg,
1428                 .callback_ops = &nfs4_open_confirm_ops,
1429                 .callback_data = data,
1430                 .workqueue = nfsiod_workqueue,
1431                 .flags = RPC_TASK_ASYNC,
1432         };
1433         int status;
1434
1435         kref_get(&data->kref);
1436         data->rpc_done = 0;
1437         data->rpc_status = 0;
1438         data->timestamp = jiffies;
1439         task = rpc_run_task(&task_setup_data);
1440         if (IS_ERR(task))
1441                 return PTR_ERR(task);
1442         status = nfs4_wait_for_completion_rpc_task(task);
1443         if (status != 0) {
1444                 data->cancelled = 1;
1445                 smp_wmb();
1446         } else
1447                 status = data->rpc_status;
1448         rpc_put_task(task);
1449         return status;
1450 }
1451
1452 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1453 {
1454         struct nfs4_opendata *data = calldata;
1455         struct nfs4_state_owner *sp = data->owner;
1456
1457         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1458                 return;
1459         /*
1460          * Check if we still need to send an OPEN call, or if we can use
1461          * a delegation instead.
1462          */
1463         if (data->state != NULL) {
1464                 struct nfs_delegation *delegation;
1465
1466                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1467                         goto out_no_action;
1468                 rcu_read_lock();
1469                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1470                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1471                     can_open_delegated(delegation, data->o_arg.fmode))
1472                         goto unlock_no_action;
1473                 rcu_read_unlock();
1474         }
1475         /* Update client id. */
1476         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1477         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1478                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1479                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1480                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1481         }
1482         data->timestamp = jiffies;
1483         if (nfs4_setup_sequence(data->o_arg.server,
1484                                 &data->o_arg.seq_args,
1485                                 &data->o_res.seq_res,
1486                                 task) != 0)
1487                 nfs_release_seqid(data->o_arg.seqid);
1488         return;
1489 unlock_no_action:
1490         rcu_read_unlock();
1491 out_no_action:
1492         task->tk_action = NULL;
1493
1494 }
1495
1496 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1497 {
1498         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1499         nfs4_open_prepare(task, calldata);
1500 }
1501
1502 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1503 {
1504         struct nfs4_opendata *data = calldata;
1505
1506         data->rpc_status = task->tk_status;
1507
1508         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1509                 return;
1510
1511         if (task->tk_status == 0) {
1512                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1513                         switch (data->o_res.f_attr->mode & S_IFMT) {
1514                         case S_IFREG:
1515                                 break;
1516                         case S_IFLNK:
1517                                 data->rpc_status = -ELOOP;
1518                                 break;
1519                         case S_IFDIR:
1520                                 data->rpc_status = -EISDIR;
1521                                 break;
1522                         default:
1523                                 data->rpc_status = -ENOTDIR;
1524                         }
1525                 }
1526                 renew_lease(data->o_res.server, data->timestamp);
1527                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1528                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1529         }
1530         data->rpc_done = 1;
1531 }
1532
1533 static void nfs4_open_release(void *calldata)
1534 {
1535         struct nfs4_opendata *data = calldata;
1536         struct nfs4_state *state = NULL;
1537
1538         /* If this request hasn't been cancelled, do nothing */
1539         if (data->cancelled == 0)
1540                 goto out_free;
1541         /* In case of error, no cleanup! */
1542         if (data->rpc_status != 0 || !data->rpc_done)
1543                 goto out_free;
1544         /* In case we need an open_confirm, no cleanup! */
1545         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1546                 goto out_free;
1547         state = nfs4_opendata_to_nfs4_state(data);
1548         if (!IS_ERR(state))
1549                 nfs4_close_state(state, data->o_arg.fmode);
1550 out_free:
1551         nfs4_opendata_put(data);
1552 }
1553
1554 static const struct rpc_call_ops nfs4_open_ops = {
1555         .rpc_call_prepare = nfs4_open_prepare,
1556         .rpc_call_done = nfs4_open_done,
1557         .rpc_release = nfs4_open_release,
1558 };
1559
1560 static const struct rpc_call_ops nfs4_recover_open_ops = {
1561         .rpc_call_prepare = nfs4_recover_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                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
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 {
1635         struct nfs_access_entry cache;
1636         u32 mask;
1637
1638         /* access call failed or for some reason the server doesn't
1639          * support any access modes -- defer access call until later */
1640         if (opendata->o_res.access_supported == 0)
1641                 return 0;
1642
1643         mask = 0;
1644         /* don't check MAY_WRITE - a newly created file may not have
1645          * write mode bits, but POSIX allows the creating process to write */
1646         if (fmode & FMODE_READ)
1647                 mask |= MAY_READ;
1648         if (fmode & FMODE_EXEC)
1649                 mask |= MAY_EXEC;
1650
1651         cache.cred = cred;
1652         cache.jiffies = jiffies;
1653         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1654         nfs_access_add_cache(state->inode, &cache);
1655
1656         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1657                 return 0;
1658
1659         /* even though OPEN succeeded, access is denied. Close the file */
1660         nfs4_close_state(state, fmode);
1661         return -EACCES;
1662 }
1663
1664 /*
1665  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1666  */
1667 static int _nfs4_proc_open(struct nfs4_opendata *data)
1668 {
1669         struct inode *dir = data->dir->d_inode;
1670         struct nfs_server *server = NFS_SERVER(dir);
1671         struct nfs_openargs *o_arg = &data->o_arg;
1672         struct nfs_openres *o_res = &data->o_res;
1673         int status;
1674
1675         status = nfs4_run_open_task(data, 0);
1676         if (!data->rpc_done)
1677                 return status;
1678         if (status != 0) {
1679                 if (status == -NFS4ERR_BADNAME &&
1680                                 !(o_arg->open_flags & O_CREAT))
1681                         return -ENOENT;
1682                 return status;
1683         }
1684
1685         nfs_fattr_map_and_free_names(server, &data->f_attr);
1686
1687         if (o_arg->open_flags & O_CREAT)
1688                 update_changeattr(dir, &o_res->cinfo);
1689         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1690                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1691         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1692                 status = _nfs4_proc_open_confirm(data);
1693                 if (status != 0)
1694                         return status;
1695         }
1696         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1697                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1698         return 0;
1699 }
1700
1701 static int nfs4_recover_expired_lease(struct nfs_server *server)
1702 {
1703         return nfs4_client_recover_expired_lease(server->nfs_client);
1704 }
1705
1706 /*
1707  * OPEN_EXPIRED:
1708  *      reclaim state on the server after a network partition.
1709  *      Assumes caller holds the appropriate lock
1710  */
1711 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1712 {
1713         struct nfs4_opendata *opendata;
1714         int ret;
1715
1716         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1717         if (IS_ERR(opendata))
1718                 return PTR_ERR(opendata);
1719         ret = nfs4_open_recover(opendata, state);
1720         if (ret == -ESTALE)
1721                 d_drop(ctx->dentry);
1722         nfs4_opendata_put(opendata);
1723         return ret;
1724 }
1725
1726 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1727 {
1728         struct nfs_server *server = NFS_SERVER(state->inode);
1729         struct nfs4_exception exception = { };
1730         int err;
1731
1732         do {
1733                 err = _nfs4_open_expired(ctx, state);
1734                 switch (err) {
1735                 default:
1736                         goto out;
1737                 case -NFS4ERR_GRACE:
1738                 case -NFS4ERR_DELAY:
1739                         nfs4_handle_exception(server, err, &exception);
1740                         err = 0;
1741                 }
1742         } while (exception.retry);
1743 out:
1744         return err;
1745 }
1746
1747 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1748 {
1749         struct nfs_open_context *ctx;
1750         int ret;
1751
1752         ctx = nfs4_state_find_open_context(state);
1753         if (IS_ERR(ctx))
1754                 return PTR_ERR(ctx);
1755         ret = nfs4_do_open_expired(ctx, state);
1756         put_nfs_open_context(ctx);
1757         return ret;
1758 }
1759
1760 #if defined(CONFIG_NFS_V4_1)
1761 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1762 {
1763         struct nfs_server *server = NFS_SERVER(state->inode);
1764         nfs4_stateid *stateid = &state->stateid;
1765         int status;
1766
1767         /* If a state reset has been done, test_stateid is unneeded */
1768         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1769                 return;
1770
1771         status = nfs41_test_stateid(server, stateid);
1772         if (status != NFS_OK) {
1773                 /* Free the stateid unless the server explicitly
1774                  * informs us the stateid is unrecognized. */
1775                 if (status != -NFS4ERR_BAD_STATEID)
1776                         nfs41_free_stateid(server, stateid);
1777                 nfs_remove_bad_delegation(state->inode);
1778
1779                 write_seqlock(&state->seqlock);
1780                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1781                 write_sequnlock(&state->seqlock);
1782                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1783         }
1784 }
1785
1786 /**
1787  * nfs41_check_open_stateid - possibly free an open stateid
1788  *
1789  * @state: NFSv4 state for an inode
1790  *
1791  * Returns NFS_OK if recovery for this stateid is now finished.
1792  * Otherwise a negative NFS4ERR value is returned.
1793  */
1794 static int nfs41_check_open_stateid(struct nfs4_state *state)
1795 {
1796         struct nfs_server *server = NFS_SERVER(state->inode);
1797         nfs4_stateid *stateid = &state->open_stateid;
1798         int status;
1799
1800         /* If a state reset has been done, test_stateid is unneeded */
1801         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1802             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1803             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1804                 return -NFS4ERR_BAD_STATEID;
1805
1806         status = nfs41_test_stateid(server, stateid);
1807         if (status != NFS_OK) {
1808                 /* Free the stateid unless the server explicitly
1809                  * informs us the stateid is unrecognized. */
1810                 if (status != -NFS4ERR_BAD_STATEID)
1811                         nfs41_free_stateid(server, stateid);
1812
1813                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1814                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1815                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1816         }
1817         return status;
1818 }
1819
1820 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1821 {
1822         int status;
1823
1824         nfs41_clear_delegation_stateid(state);
1825         status = nfs41_check_open_stateid(state);
1826         if (status != NFS_OK)
1827                 status = nfs4_open_expired(sp, state);
1828         return status;
1829 }
1830 #endif
1831
1832 /*
1833  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1834  * fields corresponding to attributes that were used to store the verifier.
1835  * Make sure we clobber those fields in the later setattr call
1836  */
1837 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1838 {
1839         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1840             !(sattr->ia_valid & ATTR_ATIME_SET))
1841                 sattr->ia_valid |= ATTR_ATIME;
1842
1843         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1844             !(sattr->ia_valid & ATTR_MTIME_SET))
1845                 sattr->ia_valid |= ATTR_MTIME;
1846 }
1847
1848 /*
1849  * Returns a referenced nfs4_state
1850  */
1851 static int _nfs4_do_open(struct inode *dir,
1852                         struct dentry *dentry,
1853                         fmode_t fmode,
1854                         int flags,
1855                         struct iattr *sattr,
1856                         struct rpc_cred *cred,
1857                         struct nfs4_state **res,
1858                         struct nfs4_threshold **ctx_th)
1859 {
1860         struct nfs4_state_owner  *sp;
1861         struct nfs4_state     *state = NULL;
1862         struct nfs_server       *server = NFS_SERVER(dir);
1863         struct nfs4_opendata *opendata;
1864         int status;
1865
1866         /* Protect against reboot recovery conflicts */
1867         status = -ENOMEM;
1868         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1869         if (sp == NULL) {
1870                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1871                 goto out_err;
1872         }
1873         status = nfs4_recover_expired_lease(server);
1874         if (status != 0)
1875                 goto err_put_state_owner;
1876         if (dentry->d_inode != NULL)
1877                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1878         status = -ENOMEM;
1879         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1880         if (opendata == NULL)
1881                 goto err_put_state_owner;
1882
1883         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1884                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1885                 if (!opendata->f_attr.mdsthreshold)
1886                         goto err_opendata_put;
1887                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1888         }
1889         if (dentry->d_inode != NULL)
1890                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1891
1892         status = _nfs4_proc_open(opendata);
1893         if (status != 0)
1894                 goto err_opendata_put;
1895
1896         state = nfs4_opendata_to_nfs4_state(opendata);
1897         status = PTR_ERR(state);
1898         if (IS_ERR(state))
1899                 goto err_opendata_put;
1900         if (server->caps & NFS_CAP_POSIX_LOCK)
1901                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1902
1903         status = nfs4_opendata_access(cred, opendata, state, fmode);
1904         if (status != 0)
1905                 goto err_opendata_put;
1906
1907         if (opendata->o_arg.open_flags & O_EXCL) {
1908                 nfs4_exclusive_attrset(opendata, sattr);
1909
1910                 nfs_fattr_init(opendata->o_res.f_attr);
1911                 status = nfs4_do_setattr(state->inode, cred,
1912                                 opendata->o_res.f_attr, sattr,
1913                                 state);
1914                 if (status == 0)
1915                         nfs_setattr_update_inode(state->inode, sattr);
1916                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1917         }
1918
1919         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1920                 *ctx_th = opendata->f_attr.mdsthreshold;
1921         else
1922                 kfree(opendata->f_attr.mdsthreshold);
1923         opendata->f_attr.mdsthreshold = NULL;
1924
1925         nfs4_opendata_put(opendata);
1926         nfs4_put_state_owner(sp);
1927         *res = state;
1928         return 0;
1929 err_opendata_put:
1930         kfree(opendata->f_attr.mdsthreshold);
1931         nfs4_opendata_put(opendata);
1932 err_put_state_owner:
1933         nfs4_put_state_owner(sp);
1934 out_err:
1935         *res = NULL;
1936         return status;
1937 }
1938
1939
1940 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1941                                         struct dentry *dentry,
1942                                         fmode_t fmode,
1943                                         int flags,
1944                                         struct iattr *sattr,
1945                                         struct rpc_cred *cred,
1946                                         struct nfs4_threshold **ctx_th)
1947 {
1948         struct nfs4_exception exception = { };
1949         struct nfs4_state *res;
1950         int status;
1951
1952         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1953         do {
1954                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1955                                        &res, ctx_th);
1956                 if (status == 0)
1957                         break;
1958                 /* NOTE: BAD_SEQID means the server and client disagree about the
1959                  * book-keeping w.r.t. state-changing operations
1960                  * (OPEN/CLOSE/LOCK/LOCKU...)
1961                  * It is actually a sign of a bug on the client or on the server.
1962                  *
1963                  * If we receive a BAD_SEQID error in the particular case of
1964                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1965                  * have unhashed the old state_owner for us, and that we can
1966                  * therefore safely retry using a new one. We should still warn
1967                  * the user though...
1968                  */
1969                 if (status == -NFS4ERR_BAD_SEQID) {
1970                         pr_warn_ratelimited("NFS: v4 server %s "
1971                                         " returned a bad sequence-id error!\n",
1972                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1973                         exception.retry = 1;
1974                         continue;
1975                 }
1976                 /*
1977                  * BAD_STATEID on OPEN means that the server cancelled our
1978                  * state before it received the OPEN_CONFIRM.
1979                  * Recover by retrying the request as per the discussion
1980                  * on Page 181 of RFC3530.
1981                  */
1982                 if (status == -NFS4ERR_BAD_STATEID) {
1983                         exception.retry = 1;
1984                         continue;
1985                 }
1986                 if (status == -EAGAIN) {
1987                         /* We must have found a delegation */
1988                         exception.retry = 1;
1989                         continue;
1990                 }
1991                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1992                                         status, &exception));
1993         } while (exception.retry);
1994         return res;
1995 }
1996
1997 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1998                             struct nfs_fattr *fattr, struct iattr *sattr,
1999                             struct nfs4_state *state)
2000 {
2001         struct nfs_server *server = NFS_SERVER(inode);
2002         struct nfs_setattrargs  arg = {
2003                 .fh             = NFS_FH(inode),
2004                 .iap            = sattr,
2005                 .server         = server,
2006                 .bitmask = server->attr_bitmask,
2007         };
2008         struct nfs_setattrres  res = {
2009                 .fattr          = fattr,
2010                 .server         = server,
2011         };
2012         struct rpc_message msg = {
2013                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2014                 .rpc_argp       = &arg,
2015                 .rpc_resp       = &res,
2016                 .rpc_cred       = cred,
2017         };
2018         unsigned long timestamp = jiffies;
2019         int status;
2020
2021         nfs_fattr_init(fattr);
2022
2023         if (state != NULL) {
2024                 struct nfs_lockowner lockowner = {
2025                         .l_owner = current->files,
2026                         .l_pid = current->tgid,
2027                 };
2028                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2029                                 &lockowner);
2030         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2031                                 FMODE_WRITE)) {
2032                 /* Use that stateid */
2033         } else
2034                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2035
2036         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2037         if (status == 0 && state != NULL)
2038                 renew_lease(server, timestamp);
2039         return status;
2040 }
2041
2042 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2043                            struct nfs_fattr *fattr, struct iattr *sattr,
2044                            struct nfs4_state *state)
2045 {
2046         struct nfs_server *server = NFS_SERVER(inode);
2047         struct nfs4_exception exception = {
2048                 .state = state,
2049                 .inode = inode,
2050         };
2051         int err;
2052         do {
2053                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2054                 switch (err) {
2055                 case -NFS4ERR_OPENMODE:
2056                         if (state && !(state->state & FMODE_WRITE)) {
2057                                 err = -EBADF;
2058                                 if (sattr->ia_valid & ATTR_OPEN)
2059                                         err = -EACCES;
2060                                 goto out;
2061                         }
2062                 }
2063                 err = nfs4_handle_exception(server, err, &exception);
2064         } while (exception.retry);
2065 out:
2066         return err;
2067 }
2068
2069 struct nfs4_closedata {
2070         struct inode *inode;
2071         struct nfs4_state *state;
2072         struct nfs_closeargs arg;
2073         struct nfs_closeres res;
2074         struct nfs_fattr fattr;
2075         unsigned long timestamp;
2076         bool roc;
2077         u32 roc_barrier;
2078 };
2079
2080 static void nfs4_free_closedata(void *data)
2081 {
2082         struct nfs4_closedata *calldata = data;
2083         struct nfs4_state_owner *sp = calldata->state->owner;
2084         struct super_block *sb = calldata->state->inode->i_sb;
2085
2086         if (calldata->roc)
2087                 pnfs_roc_release(calldata->state->inode);
2088         nfs4_put_open_state(calldata->state);
2089         nfs_free_seqid(calldata->arg.seqid);
2090         nfs4_put_state_owner(sp);
2091         nfs_sb_deactive_async(sb);
2092         kfree(calldata);
2093 }
2094
2095 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2096                 fmode_t fmode)
2097 {
2098         spin_lock(&state->owner->so_lock);
2099         if (!(fmode & FMODE_READ))
2100                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2101         if (!(fmode & FMODE_WRITE))
2102                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2103         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2104         spin_unlock(&state->owner->so_lock);
2105 }
2106
2107 static void nfs4_close_done(struct rpc_task *task, void *data)
2108 {
2109         struct nfs4_closedata *calldata = data;
2110         struct nfs4_state *state = calldata->state;
2111         struct nfs_server *server = NFS_SERVER(calldata->inode);
2112
2113         dprintk("%s: begin!\n", __func__);
2114         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2115                 return;
2116         /* hmm. we are done with the inode, and in the process of freeing
2117          * the state_owner. we keep this around to process errors
2118          */
2119         switch (task->tk_status) {
2120                 case 0:
2121                         if (calldata->roc)
2122                                 pnfs_roc_set_barrier(state->inode,
2123                                                      calldata->roc_barrier);
2124                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2125                         renew_lease(server, calldata->timestamp);
2126                         nfs4_close_clear_stateid_flags(state,
2127                                         calldata->arg.fmode);
2128                         break;
2129                 case -NFS4ERR_STALE_STATEID:
2130                 case -NFS4ERR_OLD_STATEID:
2131                 case -NFS4ERR_BAD_STATEID:
2132                 case -NFS4ERR_EXPIRED:
2133                         if (calldata->arg.fmode == 0)
2134                                 break;
2135                 default:
2136                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2137                                 rpc_restart_call_prepare(task);
2138         }
2139         nfs_release_seqid(calldata->arg.seqid);
2140         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2141         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2142 }
2143
2144 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2145 {
2146         struct nfs4_closedata *calldata = data;
2147         struct nfs4_state *state = calldata->state;
2148         struct inode *inode = calldata->inode;
2149         int call_close = 0;
2150
2151         dprintk("%s: begin!\n", __func__);
2152         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2153                 return;
2154
2155         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2156         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2157         spin_lock(&state->owner->so_lock);
2158         /* Calculate the change in open mode */
2159         if (state->n_rdwr == 0) {
2160                 if (state->n_rdonly == 0) {
2161                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2162                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2163                         calldata->arg.fmode &= ~FMODE_READ;
2164                 }
2165                 if (state->n_wronly == 0) {
2166                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2167                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2168                         calldata->arg.fmode &= ~FMODE_WRITE;
2169                 }
2170         }
2171         spin_unlock(&state->owner->so_lock);
2172
2173         if (!call_close) {
2174                 /* Note: exit _without_ calling nfs4_close_done */
2175                 task->tk_action = NULL;
2176                 goto out;
2177         }
2178
2179         if (calldata->arg.fmode == 0) {
2180                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2181                 if (calldata->roc &&
2182                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2183                         goto out;
2184         }
2185
2186         nfs_fattr_init(calldata->res.fattr);
2187         calldata->timestamp = jiffies;
2188         if (nfs4_setup_sequence(NFS_SERVER(inode),
2189                                 &calldata->arg.seq_args,
2190                                 &calldata->res.seq_res,
2191                                 task) != 0)
2192                 nfs_release_seqid(calldata->arg.seqid);
2193 out:
2194         dprintk("%s: done!\n", __func__);
2195 }
2196
2197 static const struct rpc_call_ops nfs4_close_ops = {
2198         .rpc_call_prepare = nfs4_close_prepare,
2199         .rpc_call_done = nfs4_close_done,
2200         .rpc_release = nfs4_free_closedata,
2201 };
2202
2203 /*
2204  * It is possible for data to be read/written from a mem-mapped file
2205  * after the sys_close call (which hits the vfs layer as a flush).
2206  * This means that we can't safely call nfsv4 close on a file until
2207  * the inode is cleared. This in turn means that we are not good
2208  * NFSv4 citizens - we do not indicate to the server to update the file's
2209  * share state even when we are done with one of the three share
2210  * stateid's in the inode.
2211  *
2212  * NOTE: Caller must be holding the sp->so_owner semaphore!
2213  */
2214 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2215 {
2216         struct nfs_server *server = NFS_SERVER(state->inode);
2217         struct nfs4_closedata *calldata;
2218         struct nfs4_state_owner *sp = state->owner;
2219         struct rpc_task *task;
2220         struct rpc_message msg = {
2221                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2222                 .rpc_cred = state->owner->so_cred,
2223         };
2224         struct rpc_task_setup task_setup_data = {
2225                 .rpc_client = server->client,
2226                 .rpc_message = &msg,
2227                 .callback_ops = &nfs4_close_ops,
2228                 .workqueue = nfsiod_workqueue,
2229                 .flags = RPC_TASK_ASYNC,
2230         };
2231         int status = -ENOMEM;
2232
2233         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2234         if (calldata == NULL)
2235                 goto out;
2236         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2237         calldata->inode = state->inode;
2238         calldata->state = state;
2239         calldata->arg.fh = NFS_FH(state->inode);
2240         calldata->arg.stateid = &state->open_stateid;
2241         /* Serialization for the sequence id */
2242         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2243         if (calldata->arg.seqid == NULL)
2244                 goto out_free_calldata;
2245         calldata->arg.fmode = 0;
2246         calldata->arg.bitmask = server->cache_consistency_bitmask;
2247         calldata->res.fattr = &calldata->fattr;
2248         calldata->res.seqid = calldata->arg.seqid;
2249         calldata->res.server = server;
2250         calldata->roc = pnfs_roc(state->inode);
2251         nfs_sb_active(calldata->inode->i_sb);
2252
2253         msg.rpc_argp = &calldata->arg;
2254         msg.rpc_resp = &calldata->res;
2255         task_setup_data.callback_data = calldata;
2256         task = rpc_run_task(&task_setup_data);
2257         if (IS_ERR(task))
2258                 return PTR_ERR(task);
2259         status = 0;
2260         if (wait)
2261                 status = rpc_wait_for_completion_task(task);
2262         rpc_put_task(task);
2263         return status;
2264 out_free_calldata:
2265         kfree(calldata);
2266 out:
2267         nfs4_put_open_state(state);
2268         nfs4_put_state_owner(sp);
2269         return status;
2270 }
2271
2272 static struct inode *
2273 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2274 {
2275         struct nfs4_state *state;
2276
2277         /* Protect against concurrent sillydeletes */
2278         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2279                              ctx->cred, &ctx->mdsthreshold);
2280         if (IS_ERR(state))
2281                 return ERR_CAST(state);
2282         ctx->state = state;
2283         return igrab(state->inode);
2284 }
2285
2286 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2287 {
2288         if (ctx->state == NULL)
2289                 return;
2290         if (is_sync)
2291                 nfs4_close_sync(ctx->state, ctx->mode);
2292         else
2293                 nfs4_close_state(ctx->state, ctx->mode);
2294 }
2295
2296 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2297 {
2298         struct nfs4_server_caps_arg args = {
2299                 .fhandle = fhandle,
2300         };
2301         struct nfs4_server_caps_res res = {};
2302         struct rpc_message msg = {
2303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2304                 .rpc_argp = &args,
2305                 .rpc_resp = &res,
2306         };
2307         int status;
2308
2309         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2310         if (status == 0) {
2311                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2312                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2313                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2314                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2315                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2316                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2317                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2318                         server->caps |= NFS_CAP_ACLS;
2319                 if (res.has_links != 0)
2320                         server->caps |= NFS_CAP_HARDLINKS;
2321                 if (res.has_symlinks != 0)
2322                         server->caps |= NFS_CAP_SYMLINKS;
2323                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2324                         server->caps |= NFS_CAP_FILEID;
2325                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2326                         server->caps |= NFS_CAP_MODE;
2327                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2328                         server->caps |= NFS_CAP_NLINK;
2329                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2330                         server->caps |= NFS_CAP_OWNER;
2331                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2332                         server->caps |= NFS_CAP_OWNER_GROUP;
2333                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2334                         server->caps |= NFS_CAP_ATIME;
2335                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2336                         server->caps |= NFS_CAP_CTIME;
2337                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2338                         server->caps |= NFS_CAP_MTIME;
2339
2340                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2341                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2342                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2343                 server->acl_bitmask = res.acl_bitmask;
2344                 server->fh_expire_type = res.fh_expire_type;
2345         }
2346
2347         return status;
2348 }
2349
2350 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2351 {
2352         struct nfs4_exception exception = { };
2353         int err;
2354         do {
2355                 err = nfs4_handle_exception(server,
2356                                 _nfs4_server_capabilities(server, fhandle),
2357                                 &exception);
2358         } while (exception.retry);
2359         return err;
2360 }
2361
2362 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2363                 struct nfs_fsinfo *info)
2364 {
2365         struct nfs4_lookup_root_arg args = {
2366                 .bitmask = nfs4_fattr_bitmap,
2367         };
2368         struct nfs4_lookup_res res = {
2369                 .server = server,
2370                 .fattr = info->fattr,
2371                 .fh = fhandle,
2372         };
2373         struct rpc_message msg = {
2374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2375                 .rpc_argp = &args,
2376                 .rpc_resp = &res,
2377         };
2378
2379         nfs_fattr_init(info->fattr);
2380         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2381 }
2382
2383 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2384                 struct nfs_fsinfo *info)
2385 {
2386         struct nfs4_exception exception = { };
2387         int err;
2388         do {
2389                 err = _nfs4_lookup_root(server, fhandle, info);
2390                 switch (err) {
2391                 case 0:
2392                 case -NFS4ERR_WRONGSEC:
2393                         goto out;
2394                 default:
2395                         err = nfs4_handle_exception(server, err, &exception);
2396                 }
2397         } while (exception.retry);
2398 out:
2399         return err;
2400 }
2401
2402 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2403                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2404 {
2405         struct rpc_auth *auth;
2406         int ret;
2407
2408         auth = rpcauth_create(flavor, server->client);
2409         if (IS_ERR(auth)) {
2410                 ret = -EIO;
2411                 goto out;
2412         }
2413         ret = nfs4_lookup_root(server, fhandle, info);
2414 out:
2415         return ret;
2416 }
2417
2418 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2419                               struct nfs_fsinfo *info)
2420 {
2421         int i, len, status = 0;
2422         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2423
2424         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2425         if (len < 0)
2426                 return len;
2427
2428         for (i = 0; i < len; i++) {
2429                 /* AUTH_UNIX is the default flavor if none was specified,
2430                  * thus has already been tried. */
2431                 if (flav_array[i] == RPC_AUTH_UNIX)
2432                         continue;
2433
2434                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2435                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2436                         continue;
2437                 break;
2438         }
2439         /*
2440          * -EACCESS could mean that the user doesn't have correct permissions
2441          * to access the mount.  It could also mean that we tried to mount
2442          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2443          * existing mount programs don't handle -EACCES very well so it should
2444          * be mapped to -EPERM instead.
2445          */
2446         if (status == -EACCES)
2447                 status = -EPERM;
2448         return status;
2449 }
2450
2451 /*
2452  * get the file handle for the "/" directory on the server
2453  */
2454 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2455                          struct nfs_fsinfo *info)
2456 {
2457         int minor_version = server->nfs_client->cl_minorversion;
2458         int status = nfs4_lookup_root(server, fhandle, info);
2459         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2460                 /*
2461                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2462                  * by nfs4_map_errors() as this function exits.
2463                  */
2464                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2465         if (status == 0)
2466                 status = nfs4_server_capabilities(server, fhandle);
2467         if (status == 0)
2468                 status = nfs4_do_fsinfo(server, fhandle, info);
2469         return nfs4_map_errors(status);
2470 }
2471
2472 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2473                               struct nfs_fsinfo *info)
2474 {
2475         int error;
2476         struct nfs_fattr *fattr = info->fattr;
2477
2478         error = nfs4_server_capabilities(server, mntfh);
2479         if (error < 0) {
2480                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2481                 return error;
2482         }
2483
2484         error = nfs4_proc_getattr(server, mntfh, fattr);
2485         if (error < 0) {
2486                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2487                 return error;
2488         }
2489
2490         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2491             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2492                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2493
2494         return error;
2495 }
2496
2497 /*
2498  * Get locations and (maybe) other attributes of a referral.
2499  * Note that we'll actually follow the referral later when
2500  * we detect fsid mismatch in inode revalidation
2501  */
2502 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2503                              const struct qstr *name, struct nfs_fattr *fattr,
2504                              struct nfs_fh *fhandle)
2505 {
2506         int status = -ENOMEM;
2507         struct page *page = NULL;
2508         struct nfs4_fs_locations *locations = NULL;
2509
2510         page = alloc_page(GFP_KERNEL);
2511         if (page == NULL)
2512                 goto out;
2513         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2514         if (locations == NULL)
2515                 goto out;
2516
2517         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2518         if (status != 0)
2519                 goto out;
2520         /* Make sure server returned a different fsid for the referral */
2521         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2522                 dprintk("%s: server did not return a different fsid for"
2523                         " a referral at %s\n", __func__, name->name);
2524                 status = -EIO;
2525                 goto out;
2526         }
2527         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2528         nfs_fixup_referral_attributes(&locations->fattr);
2529
2530         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2531         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2532         memset(fhandle, 0, sizeof(struct nfs_fh));
2533 out:
2534         if (page)
2535                 __free_page(page);
2536         kfree(locations);
2537         return status;
2538 }
2539
2540 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2541 {
2542         struct nfs4_getattr_arg args = {
2543                 .fh = fhandle,
2544                 .bitmask = server->attr_bitmask,
2545         };
2546         struct nfs4_getattr_res res = {
2547                 .fattr = fattr,
2548                 .server = server,
2549         };
2550         struct rpc_message msg = {
2551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2552                 .rpc_argp = &args,
2553                 .rpc_resp = &res,
2554         };
2555
2556         nfs_fattr_init(fattr);
2557         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2558 }
2559
2560 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2561 {
2562         struct nfs4_exception exception = { };
2563         int err;
2564         do {
2565                 err = nfs4_handle_exception(server,
2566                                 _nfs4_proc_getattr(server, fhandle, fattr),
2567                                 &exception);
2568         } while (exception.retry);
2569         return err;
2570 }
2571
2572 /*
2573  * The file is not closed if it is opened due to the a request to change
2574  * the size of the file. The open call will not be needed once the
2575  * VFS layer lookup-intents are implemented.
2576  *
2577  * Close is called when the inode is destroyed.
2578  * If we haven't opened the file for O_WRONLY, we
2579  * need to in the size_change case to obtain a stateid.
2580  *
2581  * Got race?
2582  * Because OPEN is always done by name in nfsv4, it is
2583  * possible that we opened a different file by the same
2584  * name.  We can recognize this race condition, but we
2585  * can't do anything about it besides returning an error.
2586  *
2587  * This will be fixed with VFS changes (lookup-intent).
2588  */
2589 static int
2590 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2591                   struct iattr *sattr)
2592 {
2593         struct inode *inode = dentry->d_inode;
2594         struct rpc_cred *cred = NULL;
2595         struct nfs4_state *state = NULL;
2596         int status;
2597
2598         if (pnfs_ld_layoutret_on_setattr(inode))
2599                 pnfs_return_layout(inode);
2600
2601         nfs_fattr_init(fattr);
2602
2603         /* Deal with open(O_TRUNC) */
2604         if (sattr->ia_valid & ATTR_OPEN)
2605                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2606
2607         /* Optimization: if the end result is no change, don't RPC */
2608         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2609                 return 0;
2610
2611         /* Search for an existing open(O_WRITE) file */
2612         if (sattr->ia_valid & ATTR_FILE) {
2613                 struct nfs_open_context *ctx;
2614
2615                 ctx = nfs_file_open_context(sattr->ia_file);
2616                 if (ctx) {
2617                         cred = ctx->cred;
2618                         state = ctx->state;
2619                 }
2620         }
2621
2622         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2623         if (status == 0)
2624                 nfs_setattr_update_inode(inode, sattr);
2625         return status;
2626 }
2627
2628 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2629                 const struct qstr *name, struct nfs_fh *fhandle,
2630                 struct nfs_fattr *fattr)
2631 {
2632         struct nfs_server *server = NFS_SERVER(dir);
2633         int                    status;
2634         struct nfs4_lookup_arg args = {
2635                 .bitmask = server->attr_bitmask,
2636                 .dir_fh = NFS_FH(dir),
2637                 .name = name,
2638         };
2639         struct nfs4_lookup_res res = {
2640                 .server = server,
2641                 .fattr = fattr,
2642                 .fh = fhandle,
2643         };
2644         struct rpc_message msg = {
2645                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2646                 .rpc_argp = &args,
2647                 .rpc_resp = &res,
2648         };
2649
2650         nfs_fattr_init(fattr);
2651
2652         dprintk("NFS call  lookup %s\n", name->name);
2653         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2654         dprintk("NFS reply lookup: %d\n", status);
2655         return status;
2656 }
2657
2658 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2659 {
2660         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2661                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2662         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2663         fattr->nlink = 2;
2664 }
2665
2666 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2667                                    struct qstr *name, struct nfs_fh *fhandle,
2668                                    struct nfs_fattr *fattr)
2669 {
2670         struct nfs4_exception exception = { };
2671         struct rpc_clnt *client = *clnt;
2672         int err;
2673         do {
2674                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2675                 switch (err) {
2676                 case -NFS4ERR_BADNAME:
2677                         err = -ENOENT;
2678                         goto out;
2679                 case -NFS4ERR_MOVED:
2680                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2681                         goto out;
2682                 case -NFS4ERR_WRONGSEC:
2683                         err = -EPERM;
2684                         if (client != *clnt)
2685                                 goto out;
2686
2687                         client = nfs4_create_sec_client(client, dir, name);
2688                         if (IS_ERR(client))
2689                                 return PTR_ERR(client);
2690
2691                         exception.retry = 1;
2692                         break;
2693                 default:
2694                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2695                 }
2696         } while (exception.retry);
2697
2698 out:
2699         if (err == 0)
2700                 *clnt = client;
2701         else if (client != *clnt)
2702                 rpc_shutdown_client(client);
2703
2704         return err;
2705 }
2706
2707 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2708                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2709 {
2710         int status;
2711         struct rpc_clnt *client = NFS_CLIENT(dir);
2712
2713         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2714         if (client != NFS_CLIENT(dir)) {
2715                 rpc_shutdown_client(client);
2716                 nfs_fixup_secinfo_attributes(fattr);
2717         }
2718         return status;
2719 }
2720
2721 struct rpc_clnt *
2722 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2723                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2724 {
2725         int status;
2726         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2727
2728         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2729         if (status < 0) {
2730                 rpc_shutdown_client(client);
2731                 return ERR_PTR(status);
2732         }
2733         return client;
2734 }
2735
2736 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2737 {
2738         struct nfs_server *server = NFS_SERVER(inode);
2739         struct nfs4_accessargs args = {
2740                 .fh = NFS_FH(inode),
2741                 .bitmask = server->cache_consistency_bitmask,
2742         };
2743         struct nfs4_accessres res = {
2744                 .server = server,
2745         };
2746         struct rpc_message msg = {
2747                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2748                 .rpc_argp = &args,
2749                 .rpc_resp = &res,
2750                 .rpc_cred = entry->cred,
2751         };
2752         int mode = entry->mask;
2753         int status;
2754
2755         /*
2756          * Determine which access bits we want to ask for...
2757          */
2758         if (mode & MAY_READ)
2759                 args.access |= NFS4_ACCESS_READ;
2760         if (S_ISDIR(inode->i_mode)) {
2761                 if (mode & MAY_WRITE)
2762                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2763                 if (mode & MAY_EXEC)
2764                         args.access |= NFS4_ACCESS_LOOKUP;
2765         } else {
2766                 if (mode & MAY_WRITE)
2767                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2768                 if (mode & MAY_EXEC)
2769                         args.access |= NFS4_ACCESS_EXECUTE;
2770         }
2771
2772         res.fattr = nfs_alloc_fattr();
2773         if (res.fattr == NULL)
2774                 return -ENOMEM;
2775
2776         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2777         if (!status) {
2778                 nfs_access_set_mask(entry, res.access);
2779                 nfs_refresh_inode(inode, res.fattr);
2780         }
2781         nfs_free_fattr(res.fattr);
2782         return status;
2783 }
2784
2785 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2786 {
2787         struct nfs4_exception exception = { };
2788         int err;
2789         do {
2790                 err = nfs4_handle_exception(NFS_SERVER(inode),
2791                                 _nfs4_proc_access(inode, entry),
2792                                 &exception);
2793         } while (exception.retry);
2794         return err;
2795 }
2796
2797 /*
2798  * TODO: For the time being, we don't try to get any attributes
2799  * along with any of the zero-copy operations READ, READDIR,
2800  * READLINK, WRITE.
2801  *
2802  * In the case of the first three, we want to put the GETATTR
2803  * after the read-type operation -- this is because it is hard
2804  * to predict the length of a GETATTR response in v4, and thus
2805  * align the READ data correctly.  This means that the GETATTR
2806  * may end up partially falling into the page cache, and we should
2807  * shift it into the 'tail' of the xdr_buf before processing.
2808  * To do this efficiently, we need to know the total length
2809  * of data received, which doesn't seem to be available outside
2810  * of the RPC layer.
2811  *
2812  * In the case of WRITE, we also want to put the GETATTR after
2813  * the operation -- in this case because we want to make sure
2814  * we get the post-operation mtime and size.
2815  *
2816  * Both of these changes to the XDR layer would in fact be quite
2817  * minor, but I decided to leave them for a subsequent patch.
2818  */
2819 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2820                 unsigned int pgbase, unsigned int pglen)
2821 {
2822         struct nfs4_readlink args = {
2823                 .fh       = NFS_FH(inode),
2824                 .pgbase   = pgbase,
2825                 .pglen    = pglen,
2826                 .pages    = &page,
2827         };
2828         struct nfs4_readlink_res res;
2829         struct rpc_message msg = {
2830                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2831                 .rpc_argp = &args,
2832                 .rpc_resp = &res,
2833         };
2834
2835         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2836 }
2837
2838 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2839                 unsigned int pgbase, unsigned int pglen)
2840 {
2841         struct nfs4_exception exception = { };
2842         int err;
2843         do {
2844                 err = nfs4_handle_exception(NFS_SERVER(inode),
2845                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2846                                 &exception);
2847         } while (exception.retry);
2848         return err;
2849 }
2850
2851 /*
2852  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2853  */
2854 static int
2855 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2856                  int flags)
2857 {
2858         struct nfs_open_context *ctx;
2859         struct nfs4_state *state;
2860         int status = 0;
2861
2862         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2863         if (IS_ERR(ctx))
2864                 return PTR_ERR(ctx);
2865
2866         sattr->ia_mode &= ~current_umask();
2867         state = nfs4_do_open(dir, dentry, ctx->mode,
2868                         flags, sattr, ctx->cred,
2869                         &ctx->mdsthreshold);
2870         d_drop(dentry);
2871         if (IS_ERR(state)) {
2872                 status = PTR_ERR(state);
2873                 goto out;
2874         }
2875         d_add(dentry, igrab(state->inode));
2876         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2877         ctx->state = state;
2878 out:
2879         put_nfs_open_context(ctx);
2880         return status;
2881 }
2882
2883 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2884 {
2885         struct nfs_server *server = NFS_SERVER(dir);
2886         struct nfs_removeargs args = {
2887                 .fh = NFS_FH(dir),
2888                 .name = *name,
2889         };
2890         struct nfs_removeres res = {
2891                 .server = server,
2892         };
2893         struct rpc_message msg = {
2894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2895                 .rpc_argp = &args,
2896                 .rpc_resp = &res,
2897         };
2898         int status;
2899
2900         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2901         if (status == 0)
2902                 update_changeattr(dir, &res.cinfo);
2903         return status;
2904 }
2905
2906 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2907 {
2908         struct nfs4_exception exception = { };
2909         int err;
2910         do {
2911                 err = nfs4_handle_exception(NFS_SERVER(dir),
2912                                 _nfs4_proc_remove(dir, name),
2913                                 &exception);
2914         } while (exception.retry);
2915         return err;
2916 }
2917
2918 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2919 {
2920         struct nfs_server *server = NFS_SERVER(dir);
2921         struct nfs_removeargs *args = msg->rpc_argp;
2922         struct nfs_removeres *res = msg->rpc_resp;
2923
2924         res->server = server;
2925         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2926         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2927 }
2928
2929 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2930 {
2931         nfs4_setup_sequence(NFS_SERVER(data->dir),
2932                         &data->args.seq_args,
2933                         &data->res.seq_res,
2934                         task);
2935 }
2936
2937 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2938 {
2939         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2940
2941         if (!nfs4_sequence_done(task, &res->seq_res))
2942                 return 0;
2943         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2944                 return 0;
2945         update_changeattr(dir, &res->cinfo);
2946         return 1;
2947 }
2948
2949 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2950 {
2951         struct nfs_server *server = NFS_SERVER(dir);
2952         struct nfs_renameargs *arg = msg->rpc_argp;
2953         struct nfs_renameres *res = msg->rpc_resp;
2954
2955         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2956         res->server = server;
2957         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2958 }
2959
2960 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2961 {
2962         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2963                         &data->args.seq_args,
2964                         &data->res.seq_res,
2965                         task);
2966 }
2967
2968 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2969                                  struct inode *new_dir)
2970 {
2971         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2972
2973         if (!nfs4_sequence_done(task, &res->seq_res))
2974                 return 0;
2975         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2976                 return 0;
2977
2978         update_changeattr(old_dir, &res->old_cinfo);
2979         update_changeattr(new_dir, &res->new_cinfo);
2980         return 1;
2981 }
2982
2983 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2984                 struct inode *new_dir, struct qstr *new_name)
2985 {
2986         struct nfs_server *server = NFS_SERVER(old_dir);
2987         struct nfs_renameargs arg = {
2988                 .old_dir = NFS_FH(old_dir),
2989                 .new_dir = NFS_FH(new_dir),
2990                 .old_name = old_name,
2991                 .new_name = new_name,
2992         };
2993         struct nfs_renameres res = {
2994                 .server = server,
2995         };
2996         struct rpc_message msg = {
2997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2998                 .rpc_argp = &arg,
2999                 .rpc_resp = &res,
3000         };
3001         int status = -ENOMEM;
3002
3003         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3004         if (!status) {
3005                 update_changeattr(old_dir, &res.old_cinfo);
3006                 update_changeattr(new_dir, &res.new_cinfo);
3007         }
3008         return status;
3009 }
3010
3011 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3012                 struct inode *new_dir, struct qstr *new_name)
3013 {
3014         struct nfs4_exception exception = { };
3015         int err;
3016         do {
3017                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3018                                 _nfs4_proc_rename(old_dir, old_name,
3019                                         new_dir, new_name),
3020                                 &exception);
3021         } while (exception.retry);
3022         return err;
3023 }
3024
3025 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3026 {
3027         struct nfs_server *server = NFS_SERVER(inode);
3028         struct nfs4_link_arg arg = {
3029                 .fh     = NFS_FH(inode),
3030                 .dir_fh = NFS_FH(dir),
3031                 .name   = name,
3032                 .bitmask = server->attr_bitmask,
3033         };
3034         struct nfs4_link_res res = {
3035                 .server = server,
3036         };
3037         struct rpc_message msg = {
3038                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3039                 .rpc_argp = &arg,
3040                 .rpc_resp = &res,
3041         };
3042         int status = -ENOMEM;
3043
3044         res.fattr = nfs_alloc_fattr();
3045         if (res.fattr == NULL)
3046                 goto out;
3047
3048         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3049         if (!status) {
3050                 update_changeattr(dir, &res.cinfo);
3051                 nfs_post_op_update_inode(inode, res.fattr);
3052         }
3053 out:
3054         nfs_free_fattr(res.fattr);
3055         return status;
3056 }
3057
3058 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3059 {
3060         struct nfs4_exception exception = { };
3061         int err;
3062         do {
3063                 err = nfs4_handle_exception(NFS_SERVER(inode),
3064                                 _nfs4_proc_link(inode, dir, name),
3065                                 &exception);
3066         } while (exception.retry);
3067         return err;
3068 }
3069
3070 struct nfs4_createdata {
3071         struct rpc_message msg;
3072         struct nfs4_create_arg arg;
3073         struct nfs4_create_res res;
3074         struct nfs_fh fh;
3075         struct nfs_fattr fattr;
3076 };
3077
3078 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3079                 struct qstr *name, struct iattr *sattr, u32 ftype)
3080 {
3081         struct nfs4_createdata *data;
3082
3083         data = kzalloc(sizeof(*data), GFP_KERNEL);
3084         if (data != NULL) {
3085                 struct nfs_server *server = NFS_SERVER(dir);
3086
3087                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3088                 data->msg.rpc_argp = &data->arg;
3089                 data->msg.rpc_resp = &data->res;
3090                 data->arg.dir_fh = NFS_FH(dir);
3091                 data->arg.server = server;
3092                 data->arg.name = name;
3093                 data->arg.attrs = sattr;
3094                 data->arg.ftype = ftype;
3095                 data->arg.bitmask = server->attr_bitmask;
3096                 data->res.server = server;
3097                 data->res.fh = &data->fh;
3098                 data->res.fattr = &data->fattr;
3099                 nfs_fattr_init(data->res.fattr);
3100         }
3101         return data;
3102 }
3103
3104 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3105 {
3106         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3107                                     &data->arg.seq_args, &data->res.seq_res, 1);
3108         if (status == 0) {
3109                 update_changeattr(dir, &data->res.dir_cinfo);
3110                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3111         }
3112         return status;
3113 }
3114
3115 static void nfs4_free_createdata(struct nfs4_createdata *data)
3116 {
3117         kfree(data);
3118 }
3119
3120 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3121                 struct page *page, unsigned int len, struct iattr *sattr)
3122 {
3123         struct nfs4_createdata *data;
3124         int status = -ENAMETOOLONG;
3125
3126         if (len > NFS4_MAXPATHLEN)
3127                 goto out;
3128
3129         status = -ENOMEM;
3130         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3131         if (data == NULL)
3132                 goto out;
3133
3134         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3135         data->arg.u.symlink.pages = &page;
3136         data->arg.u.symlink.len = len;
3137
3138         status = nfs4_do_create(dir, dentry, data);
3139
3140         nfs4_free_createdata(data);
3141 out:
3142         return status;
3143 }
3144
3145 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3146                 struct page *page, unsigned int len, struct iattr *sattr)
3147 {
3148         struct nfs4_exception exception = { };
3149         int err;
3150         do {
3151                 err = nfs4_handle_exception(NFS_SERVER(dir),
3152                                 _nfs4_proc_symlink(dir, dentry, page,
3153                                                         len, sattr),
3154                                 &exception);
3155         } while (exception.retry);
3156         return err;
3157 }
3158
3159 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3160                 struct iattr *sattr)
3161 {
3162         struct nfs4_createdata *data;
3163         int status = -ENOMEM;
3164
3165         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3166         if (data == NULL)
3167                 goto out;
3168
3169         status = nfs4_do_create(dir, dentry, data);
3170
3171         nfs4_free_createdata(data);
3172 out:
3173         return status;
3174 }
3175
3176 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3177                 struct iattr *sattr)
3178 {
3179         struct nfs4_exception exception = { };
3180         int err;
3181
3182         sattr->ia_mode &= ~current_umask();
3183         do {
3184                 err = nfs4_handle_exception(NFS_SERVER(dir),
3185                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3186                                 &exception);
3187         } while (exception.retry);
3188         return err;
3189 }
3190
3191 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3192                 u64 cookie, struct page **pages, unsigned int count, int plus)
3193 {
3194         struct inode            *dir = dentry->d_inode;
3195         struct nfs4_readdir_arg args = {
3196                 .fh = NFS_FH(dir),
3197                 .pages = pages,
3198                 .pgbase = 0,
3199                 .count = count,
3200                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3201                 .plus = plus,
3202         };
3203         struct nfs4_readdir_res res;
3204         struct rpc_message msg = {
3205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3206                 .rpc_argp = &args,
3207                 .rpc_resp = &res,
3208                 .rpc_cred = cred,
3209         };
3210         int                     status;
3211
3212         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3213                         dentry->d_parent->d_name.name,
3214                         dentry->d_name.name,
3215                         (unsigned long long)cookie);
3216         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3217         res.pgbase = args.pgbase;
3218         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3219         if (status >= 0) {
3220                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3221                 status += args.pgbase;
3222         }
3223
3224         nfs_invalidate_atime(dir);
3225
3226         dprintk("%s: returns %d\n", __func__, status);
3227         return status;
3228 }
3229
3230 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3231                 u64 cookie, struct page **pages, unsigned int count, int plus)
3232 {
3233         struct nfs4_exception exception = { };
3234         int err;
3235         do {
3236                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3237                                 _nfs4_proc_readdir(dentry, cred, cookie,
3238                                         pages, count, plus),
3239                                 &exception);
3240         } while (exception.retry);
3241         return err;
3242 }
3243
3244 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3245                 struct iattr *sattr, dev_t rdev)
3246 {
3247         struct nfs4_createdata *data;
3248         int mode = sattr->ia_mode;
3249         int status = -ENOMEM;
3250
3251         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3252         if (data == NULL)
3253                 goto out;
3254
3255         if (S_ISFIFO(mode))
3256                 data->arg.ftype = NF4FIFO;
3257         else if (S_ISBLK(mode)) {
3258                 data->arg.ftype = NF4BLK;
3259                 data->arg.u.device.specdata1 = MAJOR(rdev);
3260                 data->arg.u.device.specdata2 = MINOR(rdev);
3261         }
3262         else if (S_ISCHR(mode)) {
3263                 data->arg.ftype = NF4CHR;
3264                 data->arg.u.device.specdata1 = MAJOR(rdev);
3265                 data->arg.u.device.specdata2 = MINOR(rdev);
3266         } else if (!S_ISSOCK(mode)) {
3267                 status = -EINVAL;
3268                 goto out_free;
3269         }
3270
3271         status = nfs4_do_create(dir, dentry, data);
3272 out_free:
3273         nfs4_free_createdata(data);
3274 out:
3275         return status;
3276 }
3277
3278 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3279                 struct iattr *sattr, dev_t rdev)
3280 {
3281         struct nfs4_exception exception = { };
3282         int err;
3283
3284         sattr->ia_mode &= ~current_umask();
3285         do {
3286                 err = nfs4_handle_exception(NFS_SERVER(dir),
3287                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3288                                 &exception);
3289         } while (exception.retry);
3290         return err;
3291 }
3292
3293 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3294                  struct nfs_fsstat *fsstat)
3295 {
3296         struct nfs4_statfs_arg args = {
3297                 .fh = fhandle,
3298                 .bitmask = server->attr_bitmask,
3299         };
3300         struct nfs4_statfs_res res = {
3301                 .fsstat = fsstat,
3302         };
3303         struct rpc_message msg = {
3304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3305                 .rpc_argp = &args,
3306                 .rpc_resp = &res,
3307         };
3308
3309         nfs_fattr_init(fsstat->fattr);
3310         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3311 }
3312
3313 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3314 {
3315         struct nfs4_exception exception = { };
3316         int err;
3317         do {
3318                 err = nfs4_handle_exception(server,
3319                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3320                                 &exception);
3321         } while (exception.retry);
3322         return err;
3323 }
3324
3325 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3326                 struct nfs_fsinfo *fsinfo)
3327 {
3328         struct nfs4_fsinfo_arg args = {
3329                 .fh = fhandle,
3330                 .bitmask = server->attr_bitmask,
3331         };
3332         struct nfs4_fsinfo_res res = {
3333                 .fsinfo = fsinfo,
3334         };
3335         struct rpc_message msg = {
3336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3337                 .rpc_argp = &args,
3338                 .rpc_resp = &res,
3339         };
3340
3341         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3342 }
3343
3344 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3345 {
3346         struct nfs4_exception exception = { };
3347         int err;
3348
3349         do {
3350                 err = nfs4_handle_exception(server,
3351                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3352                                 &exception);
3353         } while (exception.retry);
3354         return err;
3355 }
3356
3357 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3358 {
3359         int error;
3360
3361         nfs_fattr_init(fsinfo->fattr);
3362         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3363         if (error == 0) {
3364                 /* block layout checks this! */
3365                 server->pnfs_blksize = fsinfo->blksize;
3366                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3367         }
3368
3369         return error;
3370 }
3371
3372 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3373                 struct nfs_pathconf *pathconf)
3374 {
3375         struct nfs4_pathconf_arg args = {
3376                 .fh = fhandle,
3377                 .bitmask = server->attr_bitmask,
3378         };
3379         struct nfs4_pathconf_res res = {
3380                 .pathconf = pathconf,
3381         };
3382         struct rpc_message msg = {
3383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3384                 .rpc_argp = &args,
3385                 .rpc_resp = &res,
3386         };
3387
3388         /* None of the pathconf attributes are mandatory to implement */
3389         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3390                 memset(pathconf, 0, sizeof(*pathconf));
3391                 return 0;
3392         }
3393
3394         nfs_fattr_init(pathconf->fattr);
3395         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3396 }
3397
3398 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3399                 struct nfs_pathconf *pathconf)
3400 {
3401         struct nfs4_exception exception = { };
3402         int err;
3403
3404         do {
3405                 err = nfs4_handle_exception(server,
3406                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3407                                 &exception);
3408         } while (exception.retry);
3409         return err;
3410 }
3411
3412 void __nfs4_read_done_cb(struct nfs_read_data *data)
3413 {
3414         nfs_invalidate_atime(data->header->inode);
3415 }
3416
3417 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3418 {
3419         struct nfs_server *server = NFS_SERVER(data->header->inode);
3420
3421         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3422                 rpc_restart_call_prepare(task);
3423                 return -EAGAIN;
3424         }
3425
3426         __nfs4_read_done_cb(data);
3427         if (task->tk_status > 0)
3428                 renew_lease(server, data->timestamp);
3429         return 0;
3430 }
3431
3432 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3433 {
3434
3435         dprintk("--> %s\n", __func__);
3436
3437         if (!nfs4_sequence_done(task, &data->res.seq_res))
3438                 return -EAGAIN;
3439
3440         return data->read_done_cb ? data->read_done_cb(task, data) :
3441                                     nfs4_read_done_cb(task, data);
3442 }
3443
3444 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3445 {
3446         data->timestamp   = jiffies;
3447         data->read_done_cb = nfs4_read_done_cb;
3448         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3449         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3450 }
3451
3452 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3453 {
3454         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3455                         &data->args.seq_args,
3456                         &data->res.seq_res,
3457                         task);
3458 }
3459
3460 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3461 {
3462         struct inode *inode = data->header->inode;
3463
3464         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3465                 rpc_restart_call_prepare(task);
3466                 return -EAGAIN;
3467         }
3468         if (task->tk_status >= 0) {
3469                 renew_lease(NFS_SERVER(inode), data->timestamp);
3470                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3471         }
3472         return 0;
3473 }
3474
3475 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3476 {
3477         if (!nfs4_sequence_done(task, &data->res.seq_res))
3478                 return -EAGAIN;
3479         return data->write_done_cb ? data->write_done_cb(task, data) :
3480                 nfs4_write_done_cb(task, data);
3481 }
3482
3483 static
3484 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3485 {
3486         const struct nfs_pgio_header *hdr = data->header;
3487
3488         /* Don't request attributes for pNFS or O_DIRECT writes */
3489         if (data->ds_clp != NULL || hdr->dreq != NULL)
3490                 return false;
3491         /* Otherwise, request attributes if and only if we don't hold
3492          * a delegation
3493          */
3494         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3495 }
3496
3497 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3498 {
3499         struct nfs_server *server = NFS_SERVER(data->header->inode);
3500
3501         if (!nfs4_write_need_cache_consistency_data(data)) {
3502                 data->args.bitmask = NULL;
3503                 data->res.fattr = NULL;
3504         } else
3505                 data->args.bitmask = server->cache_consistency_bitmask;
3506
3507         if (!data->write_done_cb)
3508                 data->write_done_cb = nfs4_write_done_cb;
3509         data->res.server = server;
3510         data->timestamp   = jiffies;
3511
3512         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3513         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3514 }
3515
3516 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3517 {
3518         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3519                         &data->args.seq_args,
3520                         &data->res.seq_res,
3521                         task);
3522 }
3523
3524 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3525 {
3526         nfs4_setup_sequence(NFS_SERVER(data->inode),
3527                         &data->args.seq_args,
3528                         &data->res.seq_res,
3529                         task);
3530 }
3531
3532 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3533 {
3534         struct inode *inode = data->inode;
3535
3536         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3537                 rpc_restart_call_prepare(task);
3538                 return -EAGAIN;
3539         }
3540         return 0;
3541 }
3542
3543 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3544 {
3545         if (!nfs4_sequence_done(task, &data->res.seq_res))
3546                 return -EAGAIN;
3547         return data->commit_done_cb(task, data);
3548 }
3549
3550 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3551 {
3552         struct nfs_server *server = NFS_SERVER(data->inode);
3553
3554         if (data->commit_done_cb == NULL)
3555                 data->commit_done_cb = nfs4_commit_done_cb;
3556         data->res.server = server;
3557         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3558         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3559 }
3560
3561 struct nfs4_renewdata {
3562         struct nfs_client       *client;
3563         unsigned long           timestamp;
3564 };
3565
3566 /*
3567  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3568  * standalone procedure for queueing an asynchronous RENEW.
3569  */
3570 static void nfs4_renew_release(void *calldata)
3571 {
3572         struct nfs4_renewdata *data = calldata;
3573         struct nfs_client *clp = data->client;
3574
3575         if (atomic_read(&clp->cl_count) > 1)
3576                 nfs4_schedule_state_renewal(clp);
3577         nfs_put_client(clp);
3578         kfree(data);
3579 }
3580
3581 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3582 {
3583         struct nfs4_renewdata *data = calldata;
3584         struct nfs_client *clp = data->client;
3585         unsigned long timestamp = data->timestamp;
3586
3587         if (task->tk_status < 0) {
3588                 /* Unless we're shutting down, schedule state recovery! */
3589                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3590                         return;
3591                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3592                         nfs4_schedule_lease_recovery(clp);
3593                         return;
3594                 }
3595                 nfs4_schedule_path_down_recovery(clp);
3596         }
3597         do_renew_lease(clp, timestamp);
3598 }
3599
3600 static const struct rpc_call_ops nfs4_renew_ops = {
3601         .rpc_call_done = nfs4_renew_done,
3602         .rpc_release = nfs4_renew_release,
3603 };
3604
3605 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3606 {
3607         struct rpc_message msg = {
3608                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3609                 .rpc_argp       = clp,
3610                 .rpc_cred       = cred,
3611         };
3612         struct nfs4_renewdata *data;
3613
3614         if (renew_flags == 0)
3615                 return 0;
3616         if (!atomic_inc_not_zero(&clp->cl_count))
3617                 return -EIO;
3618         data = kmalloc(sizeof(*data), GFP_NOFS);
3619         if (data == NULL)
3620                 return -ENOMEM;
3621         data->client = clp;
3622         data->timestamp = jiffies;
3623         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3624                         &nfs4_renew_ops, data);
3625 }
3626
3627 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3628 {
3629         struct rpc_message msg = {
3630                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3631                 .rpc_argp       = clp,
3632                 .rpc_cred       = cred,
3633         };
3634         unsigned long now = jiffies;
3635         int status;
3636
3637         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3638         if (status < 0)
3639                 return status;
3640         do_renew_lease(clp, now);
3641         return 0;
3642 }
3643
3644 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3645 {
3646         return (server->caps & NFS_CAP_ACLS)
3647                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3648                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3649 }
3650
3651 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3652  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3653  * the stack.
3654  */
3655 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3656
3657 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3658                 struct page **pages, unsigned int *pgbase)
3659 {
3660         struct page *newpage, **spages;
3661         int rc = 0;
3662         size_t len;
3663         spages = pages;
3664
3665         do {
3666                 len = min_t(size_t, PAGE_SIZE, buflen);
3667                 newpage = alloc_page(GFP_KERNEL);
3668
3669                 if (newpage == NULL)
3670                         goto unwind;
3671                 memcpy(page_address(newpage), buf, len);
3672                 buf += len;
3673                 buflen -= len;
3674                 *pages++ = newpage;
3675                 rc++;
3676         } while (buflen != 0);
3677
3678         return rc;
3679
3680 unwind:
3681         for(; rc > 0; rc--)
3682                 __free_page(spages[rc-1]);
3683         return -ENOMEM;
3684 }
3685
3686 struct nfs4_cached_acl {
3687         int cached;
3688         size_t len;
3689         char data[0];
3690 };
3691
3692 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3693 {
3694         struct nfs_inode *nfsi = NFS_I(inode);
3695
3696         spin_lock(&inode->i_lock);
3697         kfree(nfsi->nfs4_acl);
3698         nfsi->nfs4_acl = acl;
3699         spin_unlock(&inode->i_lock);
3700 }
3701
3702 static void nfs4_zap_acl_attr(struct inode *inode)
3703 {
3704         nfs4_set_cached_acl(inode, NULL);
3705 }
3706
3707 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3708 {
3709         struct nfs_inode *nfsi = NFS_I(inode);
3710         struct nfs4_cached_acl *acl;
3711         int ret = -ENOENT;
3712
3713         spin_lock(&inode->i_lock);
3714         acl = nfsi->nfs4_acl;
3715         if (acl == NULL)
3716                 goto out;
3717         if (buf == NULL) /* user is just asking for length */
3718                 goto out_len;
3719         if (acl->cached == 0)
3720                 goto out;
3721         ret = -ERANGE; /* see getxattr(2) man page */
3722         if (acl->len > buflen)
3723                 goto out;
3724         memcpy(buf, acl->data, acl->len);
3725 out_len:
3726         ret = acl->len;
3727 out:
3728         spin_unlock(&inode->i_lock);
3729         return ret;
3730 }
3731
3732 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3733 {
3734         struct nfs4_cached_acl *acl;
3735         size_t buflen = sizeof(*acl) + acl_len;
3736
3737         if (buflen <= PAGE_SIZE) {
3738                 acl = kmalloc(buflen, GFP_KERNEL);
3739                 if (acl == NULL)
3740                         goto out;
3741                 acl->cached = 1;
3742                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3743         } else {
3744                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3745                 if (acl == NULL)
3746                         goto out;
3747                 acl->cached = 0;
3748         }
3749         acl->len = acl_len;
3750 out:
3751         nfs4_set_cached_acl(inode, acl);
3752 }
3753
3754 /*
3755  * The getxattr API returns the required buffer length when called with a
3756  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3757  * the required buf.  On a NULL buf, we send a page of data to the server
3758  * guessing that the ACL request can be serviced by a page. If so, we cache
3759  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3760  * the cache. If not so, we throw away the page, and cache the required
3761  * length. The next getxattr call will then produce another round trip to
3762  * the server, this time with the input buf of the required size.
3763  */
3764 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3765 {
3766         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3767         struct nfs_getaclargs args = {
3768                 .fh = NFS_FH(inode),
3769                 .acl_pages = pages,
3770                 .acl_len = buflen,
3771         };
3772         struct nfs_getaclres res = {
3773                 .acl_len = buflen,
3774         };
3775         struct rpc_message msg = {
3776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3777                 .rpc_argp = &args,
3778                 .rpc_resp = &res,
3779         };
3780         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3781         int ret = -ENOMEM, i;
3782
3783         /* As long as we're doing a round trip to the server anyway,
3784          * let's be prepared for a page of acl data. */
3785         if (npages == 0)
3786                 npages = 1;
3787         if (npages > ARRAY_SIZE(pages))
3788                 return -ERANGE;
3789
3790         for (i = 0; i < npages; i++) {
3791                 pages[i] = alloc_page(GFP_KERNEL);
3792                 if (!pages[i])
3793                         goto out_free;
3794         }
3795
3796         /* for decoding across pages */
3797         res.acl_scratch = alloc_page(GFP_KERNEL);
3798         if (!res.acl_scratch)
3799                 goto out_free;
3800
3801         args.acl_len = npages * PAGE_SIZE;
3802         args.acl_pgbase = 0;
3803
3804         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3805                 __func__, buf, buflen, npages, args.acl_len);
3806         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3807                              &msg, &args.seq_args, &res.seq_res, 0);
3808         if (ret)
3809                 goto out_free;
3810
3811         /* Handle the case where the passed-in buffer is too short */
3812         if (res.acl_flags & NFS4_ACL_TRUNC) {
3813                 /* Did the user only issue a request for the acl length? */
3814                 if (buf == NULL)
3815                         goto out_ok;
3816                 ret = -ERANGE;
3817                 goto out_free;
3818         }
3819         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3820         if (buf)
3821                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3822 out_ok:
3823         ret = res.acl_len;
3824 out_free:
3825         for (i = 0; i < npages; i++)
3826                 if (pages[i])
3827                         __free_page(pages[i]);
3828         if (res.acl_scratch)
3829                 __free_page(res.acl_scratch);
3830         return ret;
3831 }
3832
3833 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3834 {
3835         struct nfs4_exception exception = { };
3836         ssize_t ret;
3837         do {
3838                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3839                 if (ret >= 0)
3840                         break;
3841                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3842         } while (exception.retry);
3843         return ret;
3844 }
3845
3846 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3847 {
3848         struct nfs_server *server = NFS_SERVER(inode);
3849         int ret;
3850
3851         if (!nfs4_server_supports_acls(server))
3852                 return -EOPNOTSUPP;
3853         ret = nfs_revalidate_inode(server, inode);
3854         if (ret < 0)
3855                 return ret;
3856         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3857                 nfs_zap_acl_cache(inode);
3858         ret = nfs4_read_cached_acl(inode, buf, buflen);
3859         if (ret != -ENOENT)
3860                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3861                  * but no cached acl data, just the acl length */
3862                 return ret;
3863         return nfs4_get_acl_uncached(inode, buf, buflen);
3864 }
3865
3866 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3867 {
3868         struct nfs_server *server = NFS_SERVER(inode);
3869         struct page *pages[NFS4ACL_MAXPAGES];
3870         struct nfs_setaclargs arg = {
3871                 .fh             = NFS_FH(inode),
3872                 .acl_pages      = pages,
3873                 .acl_len        = buflen,
3874         };
3875         struct nfs_setaclres res;
3876         struct rpc_message msg = {
3877                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3878                 .rpc_argp       = &arg,
3879                 .rpc_resp       = &res,
3880         };
3881         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3882         int ret, i;
3883
3884         if (!nfs4_server_supports_acls(server))
3885                 return -EOPNOTSUPP;
3886         if (npages > ARRAY_SIZE(pages))
3887                 return -ERANGE;
3888         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3889         if (i < 0)
3890                 return i;
3891         nfs4_inode_return_delegation(inode);
3892         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3893
3894         /*
3895          * Free each page after tx, so the only ref left is
3896          * held by the network stack
3897          */
3898         for (; i > 0; i--)
3899                 put_page(pages[i-1]);
3900
3901         /*
3902          * Acl update can result in inode attribute update.
3903          * so mark the attribute cache invalid.
3904          */
3905         spin_lock(&inode->i_lock);
3906         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3907         spin_unlock(&inode->i_lock);
3908         nfs_access_zap_cache(inode);
3909         nfs_zap_acl_cache(inode);
3910         return ret;
3911 }
3912
3913 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3914 {
3915         struct nfs4_exception exception = { };
3916         int err;
3917         do {
3918                 err = nfs4_handle_exception(NFS_SERVER(inode),
3919                                 __nfs4_proc_set_acl(inode, buf, buflen),
3920                                 &exception);
3921         } while (exception.retry);
3922         return err;
3923 }
3924
3925 static int
3926 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3927 {
3928         struct nfs_client *clp = server->nfs_client;
3929
3930         if (task->tk_status >= 0)
3931                 return 0;
3932         switch(task->tk_status) {
3933                 case -NFS4ERR_DELEG_REVOKED:
3934                 case -NFS4ERR_ADMIN_REVOKED:
3935                 case -NFS4ERR_BAD_STATEID:
3936                         if (state == NULL)
3937                                 break;
3938                         nfs_remove_bad_delegation(state->inode);
3939                 case -NFS4ERR_OPENMODE:
3940                         if (state == NULL)
3941                                 break;
3942                         nfs4_schedule_stateid_recovery(server, state);
3943                         goto wait_on_recovery;
3944                 case -NFS4ERR_EXPIRED:
3945                         if (state != NULL)
3946                                 nfs4_schedule_stateid_recovery(server, state);
3947                 case -NFS4ERR_STALE_STATEID:
3948                 case -NFS4ERR_STALE_CLIENTID:
3949                         nfs4_schedule_lease_recovery(clp);
3950                         goto wait_on_recovery;
3951 #if defined(CONFIG_NFS_V4_1)
3952                 case -NFS4ERR_BADSESSION:
3953                 case -NFS4ERR_BADSLOT:
3954                 case -NFS4ERR_BAD_HIGH_SLOT:
3955                 case -NFS4ERR_DEADSESSION:
3956                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3957                 case -NFS4ERR_SEQ_FALSE_RETRY:
3958                 case -NFS4ERR_SEQ_MISORDERED:
3959                         dprintk("%s ERROR %d, Reset session\n", __func__,
3960                                 task->tk_status);
3961                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3962                         task->tk_status = 0;
3963                         return -EAGAIN;
3964 #endif /* CONFIG_NFS_V4_1 */
3965                 case -NFS4ERR_DELAY:
3966                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3967                 case -NFS4ERR_GRACE:
3968                 case -EKEYEXPIRED:
3969                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3970                         task->tk_status = 0;
3971                         return -EAGAIN;
3972                 case -NFS4ERR_RETRY_UNCACHED_REP:
3973                 case -NFS4ERR_OLD_STATEID:
3974                         task->tk_status = 0;
3975                         return -EAGAIN;
3976         }
3977         task->tk_status = nfs4_map_errors(task->tk_status);
3978         return 0;
3979 wait_on_recovery:
3980         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3981         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3982                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3983         task->tk_status = 0;
3984         return -EAGAIN;
3985 }
3986
3987 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3988                                     nfs4_verifier *bootverf)
3989 {
3990         __be32 verf[2];
3991
3992         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3993                 /* An impossible timestamp guarantees this value
3994                  * will never match a generated boot time. */
3995                 verf[0] = 0;
3996                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3997         } else {
3998                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3999                 verf[0] = (__be32)nn->boot_time.tv_sec;
4000                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4001         }
4002         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4003 }
4004
4005 static unsigned int
4006 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4007                                    char *buf, size_t len)
4008 {
4009         unsigned int result;
4010
4011         rcu_read_lock();
4012         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4013                                 clp->cl_ipaddr,
4014                                 rpc_peeraddr2str(clp->cl_rpcclient,
4015                                                         RPC_DISPLAY_ADDR),
4016                                 rpc_peeraddr2str(clp->cl_rpcclient,
4017                                                         RPC_DISPLAY_PROTO));
4018         rcu_read_unlock();
4019         return result;
4020 }
4021
4022 static unsigned int
4023 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4024                                 char *buf, size_t len)
4025 {
4026         char *nodename = clp->cl_rpcclient->cl_nodename;
4027
4028         if (nfs4_client_id_uniquifier[0] != '\0')
4029                 nodename = nfs4_client_id_uniquifier;
4030         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4031                                 clp->rpc_ops->version, clp->cl_minorversion,
4032                                 nodename);
4033 }
4034
4035 /**
4036  * nfs4_proc_setclientid - Negotiate client ID
4037  * @clp: state data structure
4038  * @program: RPC program for NFSv4 callback service
4039  * @port: IP port number for NFS4 callback service
4040  * @cred: RPC credential to use for this call
4041  * @res: where to place the result
4042  *
4043  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4044  */
4045 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4046                 unsigned short port, struct rpc_cred *cred,
4047                 struct nfs4_setclientid_res *res)
4048 {
4049         nfs4_verifier sc_verifier;
4050         struct nfs4_setclientid setclientid = {
4051                 .sc_verifier = &sc_verifier,
4052                 .sc_prog = program,
4053                 .sc_cb_ident = clp->cl_cb_ident,
4054         };
4055         struct rpc_message msg = {
4056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4057                 .rpc_argp = &setclientid,
4058                 .rpc_resp = res,
4059                 .rpc_cred = cred,
4060         };
4061         int status;
4062
4063         /* nfs_client_id4 */
4064         nfs4_init_boot_verifier(clp, &sc_verifier);
4065         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4066                 setclientid.sc_name_len =
4067                                 nfs4_init_uniform_client_string(clp,
4068                                                 setclientid.sc_name,
4069                                                 sizeof(setclientid.sc_name));
4070         else
4071                 setclientid.sc_name_len =
4072                                 nfs4_init_nonuniform_client_string(clp,
4073                                                 setclientid.sc_name,
4074                                                 sizeof(setclientid.sc_name));
4075         /* cb_client4 */
4076         rcu_read_lock();
4077         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4078                                 sizeof(setclientid.sc_netid),
4079                                 rpc_peeraddr2str(clp->cl_rpcclient,
4080                                                         RPC_DISPLAY_NETID));
4081         rcu_read_unlock();
4082         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4083                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4084                                 clp->cl_ipaddr, port >> 8, port & 255);
4085
4086         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4087                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4088                 setclientid.sc_name_len, setclientid.sc_name);
4089         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4090         dprintk("NFS reply setclientid: %d\n", status);
4091         return status;
4092 }
4093
4094 /**
4095  * nfs4_proc_setclientid_confirm - Confirm client ID
4096  * @clp: state data structure
4097  * @res: result of a previous SETCLIENTID
4098  * @cred: RPC credential to use for this call
4099  *
4100  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4101  */
4102 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4103                 struct nfs4_setclientid_res *arg,
4104                 struct rpc_cred *cred)
4105 {
4106         struct nfs_fsinfo fsinfo;
4107         struct rpc_message msg = {
4108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4109                 .rpc_argp = arg,
4110                 .rpc_resp = &fsinfo,
4111                 .rpc_cred = cred,
4112         };
4113         unsigned long now;
4114         int status;
4115
4116         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4117                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4118                 clp->cl_clientid);
4119         now = jiffies;
4120         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4121         if (status == 0) {
4122                 spin_lock(&clp->cl_lock);
4123                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4124                 clp->cl_last_renewal = now;
4125                 spin_unlock(&clp->cl_lock);
4126         }
4127         dprintk("NFS reply setclientid_confirm: %d\n", status);
4128         return status;
4129 }
4130
4131 struct nfs4_delegreturndata {
4132         struct nfs4_delegreturnargs args;
4133         struct nfs4_delegreturnres res;
4134         struct nfs_fh fh;
4135         nfs4_stateid stateid;
4136         unsigned long timestamp;
4137         struct nfs_fattr fattr;
4138         int rpc_status;
4139 };
4140
4141 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4142 {
4143         struct nfs4_delegreturndata *data = calldata;
4144
4145         if (!nfs4_sequence_done(task, &data->res.seq_res))
4146                 return;
4147
4148         switch (task->tk_status) {
4149         case -NFS4ERR_STALE_STATEID:
4150         case -NFS4ERR_EXPIRED:
4151         case 0:
4152                 renew_lease(data->res.server, data->timestamp);
4153                 break;
4154         default:
4155                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4156                                 -EAGAIN) {
4157                         rpc_restart_call_prepare(task);
4158                         return;
4159                 }
4160         }
4161         data->rpc_status = task->tk_status;
4162 }
4163
4164 static void nfs4_delegreturn_release(void *calldata)
4165 {
4166         kfree(calldata);
4167 }
4168
4169 #if defined(CONFIG_NFS_V4_1)
4170 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4171 {
4172         struct nfs4_delegreturndata *d_data;
4173
4174         d_data = (struct nfs4_delegreturndata *)data;
4175
4176         nfs4_setup_sequence(d_data->res.server,
4177                         &d_data->args.seq_args,
4178                         &d_data->res.seq_res,
4179                         task);
4180 }
4181 #endif /* CONFIG_NFS_V4_1 */
4182
4183 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4184 #if defined(CONFIG_NFS_V4_1)
4185         .rpc_call_prepare = nfs4_delegreturn_prepare,
4186 #endif /* CONFIG_NFS_V4_1 */
4187         .rpc_call_done = nfs4_delegreturn_done,
4188         .rpc_release = nfs4_delegreturn_release,
4189 };
4190
4191 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4192 {
4193         struct nfs4_delegreturndata *data;
4194         struct nfs_server *server = NFS_SERVER(inode);
4195         struct rpc_task *task;
4196         struct rpc_message msg = {
4197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4198                 .rpc_cred = cred,
4199         };
4200         struct rpc_task_setup task_setup_data = {
4201                 .rpc_client = server->client,
4202                 .rpc_message = &msg,
4203                 .callback_ops = &nfs4_delegreturn_ops,
4204                 .flags = RPC_TASK_ASYNC,
4205         };
4206         int status = 0;
4207
4208         data = kzalloc(sizeof(*data), GFP_NOFS);
4209         if (data == NULL)
4210                 return -ENOMEM;
4211         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4212         data->args.fhandle = &data->fh;
4213         data->args.stateid = &data->stateid;
4214         data->args.bitmask = server->cache_consistency_bitmask;
4215         nfs_copy_fh(&data->fh, NFS_FH(inode));
4216         nfs4_stateid_copy(&data->stateid, stateid);
4217         data->res.fattr = &data->fattr;
4218         data->res.server = server;
4219         nfs_fattr_init(data->res.fattr);
4220         data->timestamp = jiffies;
4221         data->rpc_status = 0;
4222
4223         task_setup_data.callback_data = data;
4224         msg.rpc_argp = &data->args;
4225         msg.rpc_resp = &data->res;
4226         task = rpc_run_task(&task_setup_data);
4227         if (IS_ERR(task))
4228                 return PTR_ERR(task);
4229         if (!issync)
4230                 goto out;
4231         status = nfs4_wait_for_completion_rpc_task(task);
4232         if (status != 0)
4233                 goto out;
4234         status = data->rpc_status;
4235         if (status == 0)
4236                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4237         else
4238                 nfs_refresh_inode(inode, &data->fattr);
4239 out:
4240         rpc_put_task(task);
4241         return status;
4242 }
4243
4244 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4245 {
4246         struct nfs_server *server = NFS_SERVER(inode);
4247         struct nfs4_exception exception = { };
4248         int err;
4249         do {
4250                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4251                 switch (err) {
4252                         case -NFS4ERR_STALE_STATEID:
4253                         case -NFS4ERR_EXPIRED:
4254                         case 0:
4255                                 return 0;
4256                 }
4257                 err = nfs4_handle_exception(server, err, &exception);
4258         } while (exception.retry);
4259         return err;
4260 }
4261
4262 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4263 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4264
4265 /*
4266  * sleep, with exponential backoff, and retry the LOCK operation.
4267  */
4268 static unsigned long
4269 nfs4_set_lock_task_retry(unsigned long timeout)
4270 {
4271         freezable_schedule_timeout_killable(timeout);
4272         timeout <<= 1;
4273         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4274                 return NFS4_LOCK_MAXTIMEOUT;
4275         return timeout;
4276 }
4277
4278 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4279 {
4280         struct inode *inode = state->inode;
4281         struct nfs_server *server = NFS_SERVER(inode);
4282         struct nfs_client *clp = server->nfs_client;
4283         struct nfs_lockt_args arg = {
4284                 .fh = NFS_FH(inode),
4285                 .fl = request,
4286         };
4287         struct nfs_lockt_res res = {
4288                 .denied = request,
4289         };
4290         struct rpc_message msg = {
4291                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4292                 .rpc_argp       = &arg,
4293                 .rpc_resp       = &res,
4294                 .rpc_cred       = state->owner->so_cred,
4295         };
4296         struct nfs4_lock_state *lsp;
4297         int status;
4298
4299         arg.lock_owner.clientid = clp->cl_clientid;
4300         status = nfs4_set_lock_state(state, request);
4301         if (status != 0)
4302                 goto out;
4303         lsp = request->fl_u.nfs4_fl.owner;
4304         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4305         arg.lock_owner.s_dev = server->s_dev;
4306         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4307         switch (status) {
4308                 case 0:
4309                         request->fl_type = F_UNLCK;
4310                         break;
4311                 case -NFS4ERR_DENIED:
4312                         status = 0;
4313         }
4314         request->fl_ops->fl_release_private(request);
4315 out:
4316         return status;
4317 }
4318
4319 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4320 {
4321         struct nfs4_exception exception = { };
4322         int err;
4323
4324         do {
4325                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4326                                 _nfs4_proc_getlk(state, cmd, request),
4327                                 &exception);
4328         } while (exception.retry);
4329         return err;
4330 }
4331
4332 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4333 {
4334         int res = 0;
4335         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4336                 case FL_POSIX:
4337                         res = posix_lock_file_wait(file, fl);
4338                         break;
4339                 case FL_FLOCK:
4340                         res = flock_lock_file_wait(file, fl);
4341                         break;
4342                 default:
4343                         BUG();
4344         }
4345         return res;
4346 }
4347
4348 struct nfs4_unlockdata {
4349         struct nfs_locku_args arg;
4350         struct nfs_locku_res res;
4351         struct nfs4_lock_state *lsp;
4352         struct nfs_open_context *ctx;
4353         struct file_lock fl;
4354         const struct nfs_server *server;
4355         unsigned long timestamp;
4356 };
4357
4358 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4359                 struct nfs_open_context *ctx,
4360                 struct nfs4_lock_state *lsp,
4361                 struct nfs_seqid *seqid)
4362 {
4363         struct nfs4_unlockdata *p;
4364         struct inode *inode = lsp->ls_state->inode;
4365
4366         p = kzalloc(sizeof(*p), GFP_NOFS);
4367         if (p == NULL)
4368                 return NULL;
4369         p->arg.fh = NFS_FH(inode);
4370         p->arg.fl = &p->fl;
4371         p->arg.seqid = seqid;
4372         p->res.seqid = seqid;
4373         p->arg.stateid = &lsp->ls_stateid;
4374         p->lsp = lsp;
4375         atomic_inc(&lsp->ls_count);
4376         /* Ensure we don't close file until we're done freeing locks! */
4377         p->ctx = get_nfs_open_context(ctx);
4378         memcpy(&p->fl, fl, sizeof(p->fl));
4379         p->server = NFS_SERVER(inode);
4380         return p;
4381 }
4382
4383 static void nfs4_locku_release_calldata(void *data)
4384 {
4385         struct nfs4_unlockdata *calldata = data;
4386         nfs_free_seqid(calldata->arg.seqid);
4387         nfs4_put_lock_state(calldata->lsp);
4388         put_nfs_open_context(calldata->ctx);
4389         kfree(calldata);
4390 }
4391
4392 static void nfs4_locku_done(struct rpc_task *task, void *data)
4393 {
4394         struct nfs4_unlockdata *calldata = data;
4395
4396         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4397                 return;
4398         switch (task->tk_status) {
4399                 case 0:
4400                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4401                                         &calldata->res.stateid);
4402                         renew_lease(calldata->server, calldata->timestamp);
4403                         break;
4404                 case -NFS4ERR_BAD_STATEID:
4405                 case -NFS4ERR_OLD_STATEID:
4406                 case -NFS4ERR_STALE_STATEID:
4407                 case -NFS4ERR_EXPIRED:
4408                         break;
4409                 default:
4410                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4411                                 rpc_restart_call_prepare(task);
4412         }
4413         nfs_release_seqid(calldata->arg.seqid);
4414 }
4415
4416 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4417 {
4418         struct nfs4_unlockdata *calldata = data;
4419
4420         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4421                 return;
4422         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4423                 /* Note: exit _without_ running nfs4_locku_done */
4424                 task->tk_action = NULL;
4425                 return;
4426         }
4427         calldata->timestamp = jiffies;
4428         if (nfs4_setup_sequence(calldata->server,
4429                                 &calldata->arg.seq_args,
4430                                 &calldata->res.seq_res,
4431                                 task) != 0)
4432                 nfs_release_seqid(calldata->arg.seqid);
4433 }
4434
4435 static const struct rpc_call_ops nfs4_locku_ops = {
4436         .rpc_call_prepare = nfs4_locku_prepare,
4437         .rpc_call_done = nfs4_locku_done,
4438         .rpc_release = nfs4_locku_release_calldata,
4439 };
4440
4441 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4442                 struct nfs_open_context *ctx,
4443                 struct nfs4_lock_state *lsp,
4444                 struct nfs_seqid *seqid)
4445 {
4446         struct nfs4_unlockdata *data;
4447         struct rpc_message msg = {
4448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4449                 .rpc_cred = ctx->cred,
4450         };
4451         struct rpc_task_setup task_setup_data = {
4452                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4453                 .rpc_message = &msg,
4454                 .callback_ops = &nfs4_locku_ops,
4455                 .workqueue = nfsiod_workqueue,
4456                 .flags = RPC_TASK_ASYNC,
4457         };
4458
4459         /* Ensure this is an unlock - when canceling a lock, the
4460          * canceled lock is passed in, and it won't be an unlock.
4461          */
4462         fl->fl_type = F_UNLCK;
4463
4464         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4465         if (data == NULL) {
4466                 nfs_free_seqid(seqid);
4467                 return ERR_PTR(-ENOMEM);
4468         }
4469
4470         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4471         msg.rpc_argp = &data->arg;
4472         msg.rpc_resp = &data->res;
4473         task_setup_data.callback_data = data;
4474         return rpc_run_task(&task_setup_data);
4475 }
4476
4477 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4478 {
4479         struct nfs_inode *nfsi = NFS_I(state->inode);
4480         struct nfs_seqid *seqid;
4481         struct nfs4_lock_state *lsp;
4482         struct rpc_task *task;
4483         int status = 0;
4484         unsigned char fl_flags = request->fl_flags;
4485
4486         status = nfs4_set_lock_state(state, request);
4487         /* Unlock _before_ we do the RPC call */
4488         request->fl_flags |= FL_EXISTS;
4489         down_read(&nfsi->rwsem);
4490         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4491                 up_read(&nfsi->rwsem);
4492                 goto out;
4493         }
4494         up_read(&nfsi->rwsem);
4495         if (status != 0)
4496                 goto out;
4497         /* Is this a delegated lock? */
4498         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4499                 goto out;
4500         lsp = request->fl_u.nfs4_fl.owner;
4501         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4502         status = -ENOMEM;
4503         if (seqid == NULL)
4504                 goto out;
4505         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4506         status = PTR_ERR(task);
4507         if (IS_ERR(task))
4508                 goto out;
4509         status = nfs4_wait_for_completion_rpc_task(task);
4510         rpc_put_task(task);
4511 out:
4512         request->fl_flags = fl_flags;
4513         return status;
4514 }
4515
4516 struct nfs4_lockdata {
4517         struct nfs_lock_args arg;
4518         struct nfs_lock_res res;
4519         struct nfs4_lock_state *lsp;
4520         struct nfs_open_context *ctx;
4521         struct file_lock fl;
4522         unsigned long timestamp;
4523         int rpc_status;
4524         int cancelled;
4525         struct nfs_server *server;
4526 };
4527
4528 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4529                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4530                 gfp_t gfp_mask)
4531 {
4532         struct nfs4_lockdata *p;
4533         struct inode *inode = lsp->ls_state->inode;
4534         struct nfs_server *server = NFS_SERVER(inode);
4535
4536         p = kzalloc(sizeof(*p), gfp_mask);
4537         if (p == NULL)
4538                 return NULL;
4539
4540         p->arg.fh = NFS_FH(inode);
4541         p->arg.fl = &p->fl;
4542         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4543         if (p->arg.open_seqid == NULL)
4544                 goto out_free;
4545         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4546         if (p->arg.lock_seqid == NULL)
4547                 goto out_free_seqid;
4548         p->arg.lock_stateid = &lsp->ls_stateid;
4549         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4550         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4551         p->arg.lock_owner.s_dev = server->s_dev;
4552         p->res.lock_seqid = p->arg.lock_seqid;
4553         p->lsp = lsp;
4554         p->server = server;
4555         atomic_inc(&lsp->ls_count);
4556         p->ctx = get_nfs_open_context(ctx);
4557         memcpy(&p->fl, fl, sizeof(p->fl));
4558         return p;
4559 out_free_seqid:
4560         nfs_free_seqid(p->arg.open_seqid);
4561 out_free:
4562         kfree(p);
4563         return NULL;
4564 }
4565
4566 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4567 {
4568         struct nfs4_lockdata *data = calldata;
4569         struct nfs4_state *state = data->lsp->ls_state;
4570
4571         dprintk("%s: begin!\n", __func__);
4572         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4573                 return;
4574         /* Do we need to do an open_to_lock_owner? */
4575         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4576                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4577                         goto out_release_lock_seqid;
4578                 data->arg.open_stateid = &state->stateid;
4579                 data->arg.new_lock_owner = 1;
4580                 data->res.open_seqid = data->arg.open_seqid;
4581         } else
4582                 data->arg.new_lock_owner = 0;
4583         data->timestamp = jiffies;
4584         if (nfs4_setup_sequence(data->server,
4585                                 &data->arg.seq_args,
4586                                 &data->res.seq_res,
4587                                 task) == 0)
4588                 return;
4589         nfs_release_seqid(data->arg.open_seqid);
4590 out_release_lock_seqid:
4591         nfs_release_seqid(data->arg.lock_seqid);
4592         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4593 }
4594
4595 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4596 {
4597         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4598         nfs4_lock_prepare(task, calldata);
4599 }
4600
4601 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4602 {
4603         struct nfs4_lockdata *data = calldata;
4604
4605         dprintk("%s: begin!\n", __func__);
4606
4607         if (!nfs4_sequence_done(task, &data->res.seq_res))
4608                 return;
4609
4610         data->rpc_status = task->tk_status;
4611         if (data->arg.new_lock_owner != 0) {
4612                 if (data->rpc_status == 0)
4613                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4614                 else
4615                         goto out;
4616         }
4617         if (data->rpc_status == 0) {
4618                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4619                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4620                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4621         }
4622 out:
4623         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4624 }
4625
4626 static void nfs4_lock_release(void *calldata)
4627 {
4628         struct nfs4_lockdata *data = calldata;
4629
4630         dprintk("%s: begin!\n", __func__);
4631         nfs_free_seqid(data->arg.open_seqid);
4632         if (data->cancelled != 0) {
4633                 struct rpc_task *task;
4634                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4635                                 data->arg.lock_seqid);
4636                 if (!IS_ERR(task))
4637                         rpc_put_task_async(task);
4638                 dprintk("%s: cancelling lock!\n", __func__);
4639         } else
4640                 nfs_free_seqid(data->arg.lock_seqid);
4641         nfs4_put_lock_state(data->lsp);
4642         put_nfs_open_context(data->ctx);
4643         kfree(data);
4644         dprintk("%s: done!\n", __func__);
4645 }
4646
4647 static const struct rpc_call_ops nfs4_lock_ops = {
4648         .rpc_call_prepare = nfs4_lock_prepare,
4649         .rpc_call_done = nfs4_lock_done,
4650         .rpc_release = nfs4_lock_release,
4651 };
4652
4653 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4654         .rpc_call_prepare = nfs4_recover_lock_prepare,
4655         .rpc_call_done = nfs4_lock_done,
4656         .rpc_release = nfs4_lock_release,
4657 };
4658
4659 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4660 {
4661         switch (error) {
4662         case -NFS4ERR_ADMIN_REVOKED:
4663         case -NFS4ERR_BAD_STATEID:
4664                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4665                 if (new_lock_owner != 0 ||
4666                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4667                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4668                 break;
4669         case -NFS4ERR_STALE_STATEID:
4670                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4671         case -NFS4ERR_EXPIRED:
4672                 nfs4_schedule_lease_recovery(server->nfs_client);
4673         };
4674 }
4675
4676 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4677 {
4678         struct nfs4_lockdata *data;
4679         struct rpc_task *task;
4680         struct rpc_message msg = {
4681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4682                 .rpc_cred = state->owner->so_cred,
4683         };
4684         struct rpc_task_setup task_setup_data = {
4685                 .rpc_client = NFS_CLIENT(state->inode),
4686                 .rpc_message = &msg,
4687                 .callback_ops = &nfs4_lock_ops,
4688                 .workqueue = nfsiod_workqueue,
4689                 .flags = RPC_TASK_ASYNC,
4690         };
4691         int ret;
4692
4693         dprintk("%s: begin!\n", __func__);
4694         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4695                         fl->fl_u.nfs4_fl.owner,
4696                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4697         if (data == NULL)
4698                 return -ENOMEM;
4699         if (IS_SETLKW(cmd))
4700                 data->arg.block = 1;
4701         if (recovery_type > NFS_LOCK_NEW) {
4702                 if (recovery_type == NFS_LOCK_RECLAIM)
4703                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4704                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4705         }
4706         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4707         msg.rpc_argp = &data->arg;
4708         msg.rpc_resp = &data->res;
4709         task_setup_data.callback_data = data;
4710         task = rpc_run_task(&task_setup_data);
4711         if (IS_ERR(task))
4712                 return PTR_ERR(task);
4713         ret = nfs4_wait_for_completion_rpc_task(task);
4714         if (ret == 0) {
4715                 ret = data->rpc_status;
4716                 if (ret)
4717                         nfs4_handle_setlk_error(data->server, data->lsp,
4718                                         data->arg.new_lock_owner, ret);
4719         } else
4720                 data->cancelled = 1;
4721         rpc_put_task(task);
4722         dprintk("%s: done, ret = %d!\n", __func__, ret);
4723         return ret;
4724 }
4725
4726 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4727 {
4728         struct nfs_server *server = NFS_SERVER(state->inode);
4729         struct nfs4_exception exception = {
4730                 .inode = state->inode,
4731         };
4732         int err;
4733
4734         do {
4735                 /* Cache the lock if possible... */
4736                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4737                         return 0;
4738                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4739                 if (err != -NFS4ERR_DELAY)
4740                         break;
4741                 nfs4_handle_exception(server, err, &exception);
4742         } while (exception.retry);
4743         return err;
4744 }
4745
4746 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4747 {
4748         struct nfs_server *server = NFS_SERVER(state->inode);
4749         struct nfs4_exception exception = {
4750                 .inode = state->inode,
4751         };
4752         int err;
4753
4754         err = nfs4_set_lock_state(state, request);
4755         if (err != 0)
4756                 return err;
4757         do {
4758                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4759                         return 0;
4760                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4761                 switch (err) {
4762                 default:
4763                         goto out;
4764                 case -NFS4ERR_GRACE:
4765                 case -NFS4ERR_DELAY:
4766                         nfs4_handle_exception(server, err, &exception);
4767                         err = 0;
4768                 }
4769         } while (exception.retry);
4770 out:
4771         return err;
4772 }
4773
4774 #if defined(CONFIG_NFS_V4_1)
4775 /**
4776  * nfs41_check_expired_locks - possibly free a lock stateid
4777  *
4778  * @state: NFSv4 state for an inode
4779  *
4780  * Returns NFS_OK if recovery for this stateid is now finished.
4781  * Otherwise a negative NFS4ERR value is returned.
4782  */
4783 static int nfs41_check_expired_locks(struct nfs4_state *state)
4784 {
4785         int status, ret = -NFS4ERR_BAD_STATEID;
4786         struct nfs4_lock_state *lsp;
4787         struct nfs_server *server = NFS_SERVER(state->inode);
4788
4789         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4790                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4791                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4792                         if (status != NFS_OK) {
4793                                 /* Free the stateid unless the server
4794                                  * informs us the stateid is unrecognized. */
4795                                 if (status != -NFS4ERR_BAD_STATEID)
4796                                         nfs41_free_stateid(server,
4797                                                         &lsp->ls_stateid);
4798                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4799                                 ret = status;
4800                         }
4801                 }
4802         };
4803
4804         return ret;
4805 }
4806
4807 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4808 {
4809         int status = NFS_OK;
4810
4811         if (test_bit(LK_STATE_IN_USE, &state->flags))
4812                 status = nfs41_check_expired_locks(state);
4813         if (status != NFS_OK)
4814                 status = nfs4_lock_expired(state, request);
4815         return status;
4816 }
4817 #endif
4818
4819 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4820 {
4821         struct nfs_inode *nfsi = NFS_I(state->inode);
4822         unsigned char fl_flags = request->fl_flags;
4823         int status = -ENOLCK;
4824
4825         if ((fl_flags & FL_POSIX) &&
4826                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4827                 goto out;
4828         /* Is this a delegated open? */
4829         status = nfs4_set_lock_state(state, request);
4830         if (status != 0)
4831                 goto out;
4832         request->fl_flags |= FL_ACCESS;
4833         status = do_vfs_lock(request->fl_file, request);
4834         if (status < 0)
4835                 goto out;
4836         down_read(&nfsi->rwsem);
4837         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4838                 /* Yes: cache locks! */
4839                 /* ...but avoid races with delegation recall... */
4840                 request->fl_flags = fl_flags & ~FL_SLEEP;
4841                 status = do_vfs_lock(request->fl_file, request);
4842                 goto out_unlock;
4843         }
4844         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4845         if (status != 0)
4846                 goto out_unlock;
4847         /* Note: we always want to sleep here! */
4848         request->fl_flags = fl_flags | FL_SLEEP;
4849         if (do_vfs_lock(request->fl_file, request) < 0)
4850                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4851                         "manager!\n", __func__);
4852 out_unlock:
4853         up_read(&nfsi->rwsem);
4854 out:
4855         request->fl_flags = fl_flags;
4856         return status;
4857 }
4858
4859 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4860 {
4861         struct nfs4_exception exception = {
4862                 .state = state,
4863                 .inode = state->inode,
4864         };
4865         int err;
4866
4867         do {
4868                 err = _nfs4_proc_setlk(state, cmd, request);
4869                 if (err == -NFS4ERR_DENIED)
4870                         err = -EAGAIN;
4871                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4872                                 err, &exception);
4873         } while (exception.retry);
4874         return err;
4875 }
4876
4877 static int
4878 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4879 {
4880         struct nfs_open_context *ctx;
4881         struct nfs4_state *state;
4882         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4883         int status;
4884
4885         /* verify open state */
4886         ctx = nfs_file_open_context(filp);
4887         state = ctx->state;
4888
4889         if (request->fl_start < 0 || request->fl_end < 0)
4890                 return -EINVAL;
4891
4892         if (IS_GETLK(cmd)) {
4893                 if (state != NULL)
4894                         return nfs4_proc_getlk(state, F_GETLK, request);
4895                 return 0;
4896         }
4897
4898         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4899                 return -EINVAL;
4900
4901         if (request->fl_type == F_UNLCK) {
4902                 if (state != NULL)
4903                         return nfs4_proc_unlck(state, cmd, request);
4904                 return 0;
4905         }
4906
4907         if (state == NULL)
4908                 return -ENOLCK;
4909         /*
4910          * Don't rely on the VFS having checked the file open mode,
4911          * since it won't do this for flock() locks.
4912          */
4913         switch (request->fl_type) {
4914         case F_RDLCK:
4915                 if (!(filp->f_mode & FMODE_READ))
4916                         return -EBADF;
4917                 break;
4918         case F_WRLCK:
4919                 if (!(filp->f_mode & FMODE_WRITE))
4920                         return -EBADF;
4921         }
4922
4923         do {
4924                 status = nfs4_proc_setlk(state, cmd, request);
4925                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4926                         break;
4927                 timeout = nfs4_set_lock_task_retry(timeout);
4928                 status = -ERESTARTSYS;
4929                 if (signalled())
4930                         break;
4931         } while(status < 0);
4932         return status;
4933 }
4934
4935 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4936 {
4937         struct nfs_server *server = NFS_SERVER(state->inode);
4938         struct nfs4_exception exception = { };
4939         int err;
4940
4941         err = nfs4_set_lock_state(state, fl);
4942         if (err != 0)
4943                 goto out;
4944         do {
4945                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4946                 switch (err) {
4947                         default:
4948                                 printk(KERN_ERR "NFS: %s: unhandled error "
4949                                         "%d.\n", __func__, err);
4950                         case 0:
4951                         case -ESTALE:
4952                                 goto out;
4953                         case -NFS4ERR_EXPIRED:
4954                                 nfs4_schedule_stateid_recovery(server, state);
4955                         case -NFS4ERR_STALE_CLIENTID:
4956                         case -NFS4ERR_STALE_STATEID:
4957                                 nfs4_schedule_lease_recovery(server->nfs_client);
4958                                 goto out;
4959                         case -NFS4ERR_BADSESSION:
4960                         case -NFS4ERR_BADSLOT:
4961                         case -NFS4ERR_BAD_HIGH_SLOT:
4962                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4963                         case -NFS4ERR_DEADSESSION:
4964                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4965                                 goto out;
4966                         case -ERESTARTSYS:
4967                                 /*
4968                                  * The show must go on: exit, but mark the
4969                                  * stateid as needing recovery.
4970                                  */
4971                         case -NFS4ERR_DELEG_REVOKED:
4972                         case -NFS4ERR_ADMIN_REVOKED:
4973                         case -NFS4ERR_BAD_STATEID:
4974                         case -NFS4ERR_OPENMODE:
4975                                 nfs4_schedule_stateid_recovery(server, state);
4976                                 err = 0;
4977                                 goto out;
4978                         case -EKEYEXPIRED:
4979                                 /*
4980                                  * User RPCSEC_GSS context has expired.
4981                                  * We cannot recover this stateid now, so
4982                                  * skip it and allow recovery thread to
4983                                  * proceed.
4984                                  */
4985                                 err = 0;
4986                                 goto out;
4987                         case -ENOMEM:
4988                         case -NFS4ERR_DENIED:
4989                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4990                                 err = 0;
4991                                 goto out;
4992                         case -NFS4ERR_DELAY:
4993                                 break;
4994                 }
4995                 err = nfs4_handle_exception(server, err, &exception);
4996         } while (exception.retry);
4997 out:
4998         return err;
4999 }
5000
5001 struct nfs_release_lockowner_data {
5002         struct nfs4_lock_state *lsp;
5003         struct nfs_server *server;
5004         struct nfs_release_lockowner_args args;
5005 };
5006
5007 static void nfs4_release_lockowner_release(void *calldata)
5008 {
5009         struct nfs_release_lockowner_data *data = calldata;
5010         nfs4_free_lock_state(data->server, data->lsp);
5011         kfree(calldata);
5012 }
5013
5014 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5015         .rpc_release = nfs4_release_lockowner_release,
5016 };
5017
5018 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5019 {
5020         struct nfs_server *server = lsp->ls_state->owner->so_server;
5021         struct nfs_release_lockowner_data *data;
5022         struct rpc_message msg = {
5023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5024         };
5025
5026         if (server->nfs_client->cl_mvops->minor_version != 0)
5027                 return -EINVAL;
5028         data = kmalloc(sizeof(*data), GFP_NOFS);
5029         if (!data)
5030                 return -ENOMEM;
5031         data->lsp = lsp;
5032         data->server = server;
5033         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5034         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5035         data->args.lock_owner.s_dev = server->s_dev;
5036         msg.rpc_argp = &data->args;
5037         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5038         return 0;
5039 }
5040
5041 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5042
5043 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5044                                    const void *buf, size_t buflen,
5045                                    int flags, int type)
5046 {
5047         if (strcmp(key, "") != 0)
5048                 return -EINVAL;
5049
5050         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5051 }
5052
5053 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5054                                    void *buf, size_t buflen, int type)
5055 {
5056         if (strcmp(key, "") != 0)
5057                 return -EINVAL;
5058
5059         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5060 }
5061
5062 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5063                                        size_t list_len, const char *name,
5064                                        size_t name_len, int type)
5065 {
5066         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5067
5068         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5069                 return 0;
5070
5071         if (list && len <= list_len)
5072                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5073         return len;
5074 }
5075
5076 /*
5077  * nfs_fhget will use either the mounted_on_fileid or the fileid
5078  */
5079 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5080 {
5081         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5082                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5083               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5084               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5085                 return;
5086
5087         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5088                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5089         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5090         fattr->nlink = 2;
5091 }
5092
5093 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5094                                    const struct qstr *name,
5095                                    struct nfs4_fs_locations *fs_locations,
5096                                    struct page *page)
5097 {
5098         struct nfs_server *server = NFS_SERVER(dir);
5099         u32 bitmask[2] = {
5100                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5101         };
5102         struct nfs4_fs_locations_arg args = {
5103                 .dir_fh = NFS_FH(dir),
5104                 .name = name,
5105                 .page = page,
5106                 .bitmask = bitmask,
5107         };
5108         struct nfs4_fs_locations_res res = {
5109                 .fs_locations = fs_locations,
5110         };
5111         struct rpc_message msg = {
5112                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5113                 .rpc_argp = &args,
5114                 .rpc_resp = &res,
5115         };
5116         int status;
5117
5118         dprintk("%s: start\n", __func__);
5119
5120         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5121          * is not supported */
5122         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5123                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5124         else
5125                 bitmask[0] |= FATTR4_WORD0_FILEID;
5126
5127         nfs_fattr_init(&fs_locations->fattr);
5128         fs_locations->server = server;
5129         fs_locations->nlocations = 0;
5130         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5131         dprintk("%s: returned status = %d\n", __func__, status);
5132         return status;
5133 }
5134
5135 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5136                            const struct qstr *name,
5137                            struct nfs4_fs_locations *fs_locations,
5138                            struct page *page)
5139 {
5140         struct nfs4_exception exception = { };
5141         int err;
5142         do {
5143                 err = nfs4_handle_exception(NFS_SERVER(dir),
5144                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5145                                 &exception);
5146         } while (exception.retry);
5147         return err;
5148 }
5149
5150 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5151 {
5152         int status;
5153         struct nfs4_secinfo_arg args = {
5154                 .dir_fh = NFS_FH(dir),
5155                 .name   = name,
5156         };
5157         struct nfs4_secinfo_res res = {
5158                 .flavors     = flavors,
5159         };
5160         struct rpc_message msg = {
5161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5162                 .rpc_argp = &args,
5163                 .rpc_resp = &res,
5164         };
5165
5166         dprintk("NFS call  secinfo %s\n", name->name);
5167         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5168         dprintk("NFS reply  secinfo: %d\n", status);
5169         return status;
5170 }
5171
5172 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5173                       struct nfs4_secinfo_flavors *flavors)
5174 {
5175         struct nfs4_exception exception = { };
5176         int err;
5177         do {
5178                 err = nfs4_handle_exception(NFS_SERVER(dir),
5179                                 _nfs4_proc_secinfo(dir, name, flavors),
5180                                 &exception);
5181         } while (exception.retry);
5182         return err;
5183 }
5184
5185 #ifdef CONFIG_NFS_V4_1
5186 /*
5187  * Check the exchange flags returned by the server for invalid flags, having
5188  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5189  * DS flags set.
5190  */
5191 static int nfs4_check_cl_exchange_flags(u32 flags)
5192 {
5193         if (flags & ~EXCHGID4_FLAG_MASK_R)
5194                 goto out_inval;
5195         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5196             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5197                 goto out_inval;
5198         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5199                 goto out_inval;
5200         return NFS_OK;
5201 out_inval:
5202         return -NFS4ERR_INVAL;
5203 }
5204
5205 static bool
5206 nfs41_same_server_scope(struct nfs41_server_scope *a,
5207                         struct nfs41_server_scope *b)
5208 {
5209         if (a->server_scope_sz == b->server_scope_sz &&
5210             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5211                 return true;
5212
5213         return false;
5214 }
5215
5216 /*
5217  * nfs4_proc_bind_conn_to_session()
5218  *
5219  * The 4.1 client currently uses the same TCP connection for the
5220  * fore and backchannel.
5221  */
5222 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5223 {
5224         int status;
5225         struct nfs41_bind_conn_to_session_res res;
5226         struct rpc_message msg = {
5227                 .rpc_proc =
5228                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5229                 .rpc_argp = clp,
5230                 .rpc_resp = &res,
5231                 .rpc_cred = cred,
5232         };
5233
5234         dprintk("--> %s\n", __func__);
5235
5236         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5237         if (unlikely(res.session == NULL)) {
5238                 status = -ENOMEM;
5239                 goto out;
5240         }
5241
5242         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5243         if (status == 0) {
5244                 if (memcmp(res.session->sess_id.data,
5245                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5246                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5247                         status = -EIO;
5248                         goto out_session;
5249                 }
5250                 if (res.dir != NFS4_CDFS4_BOTH) {
5251                         dprintk("NFS: %s: Unexpected direction from server\n",
5252                                 __func__);
5253                         status = -EIO;
5254                         goto out_session;
5255                 }
5256                 if (res.use_conn_in_rdma_mode) {
5257                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5258                                 __func__);
5259                         status = -EIO;
5260                         goto out_session;
5261                 }
5262         }
5263 out_session:
5264         kfree(res.session);
5265 out:
5266         dprintk("<-- %s status= %d\n", __func__, status);
5267         return status;
5268 }
5269
5270 /*
5271  * nfs4_proc_exchange_id()
5272  *
5273  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5274  *
5275  * Since the clientid has expired, all compounds using sessions
5276  * associated with the stale clientid will be returning
5277  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5278  * be in some phase of session reset.
5279  */
5280 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5281 {
5282         nfs4_verifier verifier;
5283         struct nfs41_exchange_id_args args = {
5284                 .verifier = &verifier,
5285                 .client = clp,
5286                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5287         };
5288         struct nfs41_exchange_id_res res = {
5289                 0
5290         };
5291         int status;
5292         struct rpc_message msg = {
5293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5294                 .rpc_argp = &args,
5295                 .rpc_resp = &res,
5296                 .rpc_cred = cred,
5297         };
5298
5299         nfs4_init_boot_verifier(clp, &verifier);
5300         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5301                                                         sizeof(args.id));
5302         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5303                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5304                 args.id_len, args.id);
5305
5306         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5307                                         GFP_NOFS);
5308         if (unlikely(res.server_owner == NULL)) {
5309                 status = -ENOMEM;
5310                 goto out;
5311         }
5312
5313         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5314                                         GFP_NOFS);
5315         if (unlikely(res.server_scope == NULL)) {
5316                 status = -ENOMEM;
5317                 goto out_server_owner;
5318         }
5319
5320         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5321         if (unlikely(res.impl_id == NULL)) {
5322                 status = -ENOMEM;
5323                 goto out_server_scope;
5324         }
5325
5326         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5327         if (status == 0)
5328                 status = nfs4_check_cl_exchange_flags(res.flags);
5329
5330         if (status == 0) {
5331                 clp->cl_clientid = res.clientid;
5332                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5333                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5334                         clp->cl_seqid = res.seqid;
5335
5336                 kfree(clp->cl_serverowner);
5337                 clp->cl_serverowner = res.server_owner;
5338                 res.server_owner = NULL;
5339
5340                 /* use the most recent implementation id */
5341                 kfree(clp->cl_implid);
5342                 clp->cl_implid = res.impl_id;
5343
5344                 if (clp->cl_serverscope != NULL &&
5345                     !nfs41_same_server_scope(clp->cl_serverscope,
5346                                              res.server_scope)) {
5347                         dprintk("%s: server_scope mismatch detected\n",
5348                                 __func__);
5349                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5350                         kfree(clp->cl_serverscope);
5351                         clp->cl_serverscope = NULL;
5352                 }
5353
5354                 if (clp->cl_serverscope == NULL) {
5355                         clp->cl_serverscope = res.server_scope;
5356                         goto out;
5357                 }
5358         } else
5359                 kfree(res.impl_id);
5360
5361 out_server_owner:
5362         kfree(res.server_owner);
5363 out_server_scope:
5364         kfree(res.server_scope);
5365 out:
5366         if (clp->cl_implid != NULL)
5367                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5368                         "domain: %s, name: %s, date: %llu,%u\n",
5369                         clp->cl_implid->domain, clp->cl_implid->name,
5370                         clp->cl_implid->date.seconds,
5371                         clp->cl_implid->date.nseconds);
5372         dprintk("NFS reply exchange_id: %d\n", status);
5373         return status;
5374 }
5375
5376 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5377                 struct rpc_cred *cred)
5378 {
5379         struct rpc_message msg = {
5380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5381                 .rpc_argp = clp,
5382                 .rpc_cred = cred,
5383         };
5384         int status;
5385
5386         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5387         if (status)
5388                 dprintk("NFS: Got error %d from the server %s on "
5389                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5390         return status;
5391 }
5392
5393 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5394                 struct rpc_cred *cred)
5395 {
5396         unsigned int loop;
5397         int ret;
5398
5399         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5400                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5401                 switch (ret) {
5402                 case -NFS4ERR_DELAY:
5403                 case -NFS4ERR_CLIENTID_BUSY:
5404                         ssleep(1);
5405                         break;
5406                 default:
5407                         return ret;
5408                 }
5409         }
5410         return 0;
5411 }
5412
5413 int nfs4_destroy_clientid(struct nfs_client *clp)
5414 {
5415         struct rpc_cred *cred;
5416         int ret = 0;
5417
5418         if (clp->cl_mvops->minor_version < 1)
5419                 goto out;
5420         if (clp->cl_exchange_flags == 0)
5421                 goto out;
5422         if (clp->cl_preserve_clid)
5423                 goto out;
5424         cred = nfs4_get_exchange_id_cred(clp);
5425         ret = nfs4_proc_destroy_clientid(clp, cred);
5426         if (cred)
5427                 put_rpccred(cred);
5428         switch (ret) {
5429         case 0:
5430         case -NFS4ERR_STALE_CLIENTID:
5431                 clp->cl_exchange_flags = 0;
5432         }
5433 out:
5434         return ret;
5435 }
5436
5437 struct nfs4_get_lease_time_data {
5438         struct nfs4_get_lease_time_args *args;
5439         struct nfs4_get_lease_time_res *res;
5440         struct nfs_client *clp;
5441 };
5442
5443 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5444                                         void *calldata)
5445 {
5446         struct nfs4_get_lease_time_data *data =
5447                         (struct nfs4_get_lease_time_data *)calldata;
5448
5449         dprintk("--> %s\n", __func__);
5450         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5451         /* just setup sequence, do not trigger session recovery
5452            since we're invoked within one */
5453         nfs41_setup_sequence(data->clp->cl_session,
5454                         &data->args->la_seq_args,
5455                         &data->res->lr_seq_res,
5456                         task);
5457         dprintk("<-- %s\n", __func__);
5458 }
5459
5460 /*
5461  * Called from nfs4_state_manager thread for session setup, so don't recover
5462  * from sequence operation or clientid errors.
5463  */
5464 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5465 {
5466         struct nfs4_get_lease_time_data *data =
5467                         (struct nfs4_get_lease_time_data *)calldata;
5468
5469         dprintk("--> %s\n", __func__);
5470         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5471                 return;
5472         switch (task->tk_status) {
5473         case -NFS4ERR_DELAY:
5474         case -NFS4ERR_GRACE:
5475                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5476                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5477                 task->tk_status = 0;
5478                 /* fall through */
5479         case -NFS4ERR_RETRY_UNCACHED_REP:
5480                 rpc_restart_call_prepare(task);
5481                 return;
5482         }
5483         dprintk("<-- %s\n", __func__);
5484 }
5485
5486 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5487         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5488         .rpc_call_done = nfs4_get_lease_time_done,
5489 };
5490
5491 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5492 {
5493         struct rpc_task *task;
5494         struct nfs4_get_lease_time_args args;
5495         struct nfs4_get_lease_time_res res = {
5496                 .lr_fsinfo = fsinfo,
5497         };
5498         struct nfs4_get_lease_time_data data = {
5499                 .args = &args,
5500                 .res = &res,
5501                 .clp = clp,
5502         };
5503         struct rpc_message msg = {
5504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5505                 .rpc_argp = &args,
5506                 .rpc_resp = &res,
5507         };
5508         struct rpc_task_setup task_setup = {
5509                 .rpc_client = clp->cl_rpcclient,
5510                 .rpc_message = &msg,
5511                 .callback_ops = &nfs4_get_lease_time_ops,
5512                 .callback_data = &data,
5513                 .flags = RPC_TASK_TIMEOUT,
5514         };
5515         int status;
5516
5517         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5518         dprintk("--> %s\n", __func__);
5519         task = rpc_run_task(&task_setup);
5520
5521         if (IS_ERR(task))
5522                 status = PTR_ERR(task);
5523         else {
5524                 status = task->tk_status;
5525                 rpc_put_task(task);
5526         }
5527         dprintk("<-- %s return %d\n", __func__, status);
5528
5529         return status;
5530 }
5531
5532 /*
5533  * Initialize the values to be used by the client in CREATE_SESSION
5534  * If nfs4_init_session set the fore channel request and response sizes,
5535  * use them.
5536  *
5537  * Set the back channel max_resp_sz_cached to zero to force the client to
5538  * always set csa_cachethis to FALSE because the current implementation
5539  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5540  */
5541 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5542 {
5543         struct nfs4_session *session = args->client->cl_session;
5544         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5545                      mxresp_sz = session->fc_target_max_resp_sz;
5546
5547         if (mxrqst_sz == 0)
5548                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5549         if (mxresp_sz == 0)
5550                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5551         /* Fore channel attributes */
5552         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5553         args->fc_attrs.max_resp_sz = mxresp_sz;
5554         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5555         args->fc_attrs.max_reqs = max_session_slots;
5556
5557         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5558                 "max_ops=%u max_reqs=%u\n",
5559                 __func__,
5560                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5561                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5562
5563         /* Back channel attributes */
5564         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5565         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5566         args->bc_attrs.max_resp_sz_cached = 0;
5567         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5568         args->bc_attrs.max_reqs = 1;
5569
5570         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5571                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5572                 __func__,
5573                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5574                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5575                 args->bc_attrs.max_reqs);
5576 }
5577
5578 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5579 {
5580         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5581         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5582
5583         if (rcvd->max_resp_sz > sent->max_resp_sz)
5584                 return -EINVAL;
5585         /*
5586          * Our requested max_ops is the minimum we need; we're not
5587          * prepared to break up compounds into smaller pieces than that.
5588          * So, no point even trying to continue if the server won't
5589          * cooperate:
5590          */
5591         if (rcvd->max_ops < sent->max_ops)
5592                 return -EINVAL;
5593         if (rcvd->max_reqs == 0)
5594                 return -EINVAL;
5595         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5596                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5597         return 0;
5598 }
5599
5600 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5601 {
5602         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5603         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5604
5605         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5606                 return -EINVAL;
5607         if (rcvd->max_resp_sz < sent->max_resp_sz)
5608                 return -EINVAL;
5609         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5610                 return -EINVAL;
5611         /* These would render the backchannel useless: */
5612         if (rcvd->max_ops != sent->max_ops)
5613                 return -EINVAL;
5614         if (rcvd->max_reqs != sent->max_reqs)
5615                 return -EINVAL;
5616         return 0;
5617 }
5618
5619 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5620                                      struct nfs4_session *session)
5621 {
5622         int ret;
5623
5624         ret = nfs4_verify_fore_channel_attrs(args, session);
5625         if (ret)
5626                 return ret;
5627         return nfs4_verify_back_channel_attrs(args, session);
5628 }
5629
5630 static int _nfs4_proc_create_session(struct nfs_client *clp,
5631                 struct rpc_cred *cred)
5632 {
5633         struct nfs4_session *session = clp->cl_session;
5634         struct nfs41_create_session_args args = {
5635                 .client = clp,
5636                 .cb_program = NFS4_CALLBACK,
5637         };
5638         struct nfs41_create_session_res res = {
5639                 .client = clp,
5640         };
5641         struct rpc_message msg = {
5642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5643                 .rpc_argp = &args,
5644                 .rpc_resp = &res,
5645                 .rpc_cred = cred,
5646         };
5647         int status;
5648
5649         nfs4_init_channel_attrs(&args);
5650         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5651
5652         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5653
5654         if (!status) {
5655                 /* Verify the session's negotiated channel_attrs values */
5656                 status = nfs4_verify_channel_attrs(&args, session);
5657                 /* Increment the clientid slot sequence id */
5658                 clp->cl_seqid++;
5659         }
5660
5661         return status;
5662 }
5663
5664 /*
5665  * Issues a CREATE_SESSION operation to the server.
5666  * It is the responsibility of the caller to verify the session is
5667  * expired before calling this routine.
5668  */
5669 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5670 {
5671         int status;
5672         unsigned *ptr;
5673         struct nfs4_session *session = clp->cl_session;
5674
5675         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5676
5677         status = _nfs4_proc_create_session(clp, cred);
5678         if (status)
5679                 goto out;
5680
5681         /* Init or reset the session slot tables */
5682         status = nfs4_setup_session_slot_tables(session);
5683         dprintk("slot table setup returned %d\n", status);
5684         if (status)
5685                 goto out;
5686
5687         ptr = (unsigned *)&session->sess_id.data[0];
5688         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5689                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5690 out:
5691         dprintk("<-- %s\n", __func__);
5692         return status;
5693 }
5694
5695 /*
5696  * Issue the over-the-wire RPC DESTROY_SESSION.
5697  * The caller must serialize access to this routine.
5698  */
5699 int nfs4_proc_destroy_session(struct nfs4_session *session,
5700                 struct rpc_cred *cred)
5701 {
5702         struct rpc_message msg = {
5703                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5704                 .rpc_argp = session,
5705                 .rpc_cred = cred,
5706         };
5707         int status = 0;
5708
5709         dprintk("--> nfs4_proc_destroy_session\n");
5710
5711         /* session is still being setup */
5712         if (session->clp->cl_cons_state != NFS_CS_READY)
5713                 return status;
5714
5715         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5716
5717         if (status)
5718                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5719                         "Session has been destroyed regardless...\n", status);
5720
5721         dprintk("<-- nfs4_proc_destroy_session\n");
5722         return status;
5723 }
5724
5725 /*
5726  * Renew the cl_session lease.
5727  */
5728 struct nfs4_sequence_data {
5729         struct nfs_client *clp;
5730         struct nfs4_sequence_args args;
5731         struct nfs4_sequence_res res;
5732 };
5733
5734 static void nfs41_sequence_release(void *data)
5735 {
5736         struct nfs4_sequence_data *calldata = data;
5737         struct nfs_client *clp = calldata->clp;
5738
5739         if (atomic_read(&clp->cl_count) > 1)
5740                 nfs4_schedule_state_renewal(clp);
5741         nfs_put_client(clp);
5742         kfree(calldata);
5743 }
5744
5745 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5746 {
5747         switch(task->tk_status) {
5748         case -NFS4ERR_DELAY:
5749                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5750                 return -EAGAIN;
5751         default:
5752                 nfs4_schedule_lease_recovery(clp);
5753         }
5754         return 0;
5755 }
5756
5757 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5758 {
5759         struct nfs4_sequence_data *calldata = data;
5760         struct nfs_client *clp = calldata->clp;
5761
5762         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5763                 return;
5764
5765         if (task->tk_status < 0) {
5766                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5767                 if (atomic_read(&clp->cl_count) == 1)
5768                         goto out;
5769
5770                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5771                         rpc_restart_call_prepare(task);
5772                         return;
5773                 }
5774         }
5775         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5776 out:
5777         dprintk("<-- %s\n", __func__);
5778 }
5779
5780 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5781 {
5782         struct nfs4_sequence_data *calldata = data;
5783         struct nfs_client *clp = calldata->clp;
5784         struct nfs4_sequence_args *args;
5785         struct nfs4_sequence_res *res;
5786
5787         args = task->tk_msg.rpc_argp;
5788         res = task->tk_msg.rpc_resp;
5789
5790         nfs41_setup_sequence(clp->cl_session, args, res, task);
5791 }
5792
5793 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5794 {
5795         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5796         nfs41_sequence_prepare(task, data);
5797 }
5798
5799 static const struct rpc_call_ops nfs41_sequence_ops = {
5800         .rpc_call_done = nfs41_sequence_call_done,
5801         .rpc_call_prepare = nfs41_sequence_prepare,
5802         .rpc_release = nfs41_sequence_release,
5803 };
5804
5805 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5806         .rpc_call_done = nfs41_sequence_call_done,
5807         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5808         .rpc_release = nfs41_sequence_release,
5809 };
5810
5811 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5812                                              const struct rpc_call_ops *seq_ops)
5813 {
5814         struct nfs4_sequence_data *calldata;
5815         struct rpc_message msg = {
5816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5817                 .rpc_cred = cred,
5818         };
5819         struct rpc_task_setup task_setup_data = {
5820                 .rpc_client = clp->cl_rpcclient,
5821                 .rpc_message = &msg,
5822                 .callback_ops = seq_ops,
5823                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5824         };
5825
5826         if (!atomic_inc_not_zero(&clp->cl_count))
5827                 return ERR_PTR(-EIO);
5828         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5829         if (calldata == NULL) {
5830                 nfs_put_client(clp);
5831                 return ERR_PTR(-ENOMEM);
5832         }
5833         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5834         msg.rpc_argp = &calldata->args;
5835         msg.rpc_resp = &calldata->res;
5836         calldata->clp = clp;
5837         task_setup_data.callback_data = calldata;
5838
5839         return rpc_run_task(&task_setup_data);
5840 }
5841
5842 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5843 {
5844         struct rpc_task *task;
5845         int ret = 0;
5846
5847         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5848                 return 0;
5849         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5850         if (IS_ERR(task))
5851                 ret = PTR_ERR(task);
5852         else
5853                 rpc_put_task_async(task);
5854         dprintk("<-- %s status=%d\n", __func__, ret);
5855         return ret;
5856 }
5857
5858 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5859 {
5860         struct rpc_task *task;
5861         int ret;
5862
5863         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5864         if (IS_ERR(task)) {
5865                 ret = PTR_ERR(task);
5866                 goto out;
5867         }
5868         ret = rpc_wait_for_completion_task(task);
5869         if (!ret) {
5870                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5871
5872                 if (task->tk_status == 0)
5873                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5874                 ret = task->tk_status;
5875         }
5876         rpc_put_task(task);
5877 out:
5878         dprintk("<-- %s status=%d\n", __func__, ret);
5879         return ret;
5880 }
5881
5882 struct nfs4_reclaim_complete_data {
5883         struct nfs_client *clp;
5884         struct nfs41_reclaim_complete_args arg;
5885         struct nfs41_reclaim_complete_res res;
5886 };
5887
5888 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5889 {
5890         struct nfs4_reclaim_complete_data *calldata = data;
5891
5892         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5893         nfs41_setup_sequence(calldata->clp->cl_session,
5894                         &calldata->arg.seq_args,
5895                         &calldata->res.seq_res,
5896                         task);
5897 }
5898
5899 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5900 {
5901         switch(task->tk_status) {
5902         case 0:
5903         case -NFS4ERR_COMPLETE_ALREADY:
5904         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5905                 break;
5906         case -NFS4ERR_DELAY:
5907                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5908                 /* fall through */
5909         case -NFS4ERR_RETRY_UNCACHED_REP:
5910                 return -EAGAIN;
5911         default:
5912                 nfs4_schedule_lease_recovery(clp);
5913         }
5914         return 0;
5915 }
5916
5917 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5918 {
5919         struct nfs4_reclaim_complete_data *calldata = data;
5920         struct nfs_client *clp = calldata->clp;
5921         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5922
5923         dprintk("--> %s\n", __func__);
5924         if (!nfs41_sequence_done(task, res))
5925                 return;
5926
5927         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5928                 rpc_restart_call_prepare(task);
5929                 return;
5930         }
5931         dprintk("<-- %s\n", __func__);
5932 }
5933
5934 static void nfs4_free_reclaim_complete_data(void *data)
5935 {
5936         struct nfs4_reclaim_complete_data *calldata = data;
5937
5938         kfree(calldata);
5939 }
5940
5941 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5942         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5943         .rpc_call_done = nfs4_reclaim_complete_done,
5944         .rpc_release = nfs4_free_reclaim_complete_data,
5945 };
5946
5947 /*
5948  * Issue a global reclaim complete.
5949  */
5950 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5951 {
5952         struct nfs4_reclaim_complete_data *calldata;
5953         struct rpc_task *task;
5954         struct rpc_message msg = {
5955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5956         };
5957         struct rpc_task_setup task_setup_data = {
5958                 .rpc_client = clp->cl_rpcclient,
5959                 .rpc_message = &msg,
5960                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5961                 .flags = RPC_TASK_ASYNC,
5962         };
5963         int status = -ENOMEM;
5964
5965         dprintk("--> %s\n", __func__);
5966         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5967         if (calldata == NULL)
5968                 goto out;
5969         calldata->clp = clp;
5970         calldata->arg.one_fs = 0;
5971
5972         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5973         msg.rpc_argp = &calldata->arg;
5974         msg.rpc_resp = &calldata->res;
5975         task_setup_data.callback_data = calldata;
5976         task = rpc_run_task(&task_setup_data);
5977         if (IS_ERR(task)) {
5978                 status = PTR_ERR(task);
5979                 goto out;
5980         }
5981         status = nfs4_wait_for_completion_rpc_task(task);
5982         if (status == 0)
5983                 status = task->tk_status;
5984         rpc_put_task(task);
5985         return 0;
5986 out:
5987         dprintk("<-- %s status=%d\n", __func__, status);
5988         return status;
5989 }
5990
5991 static void
5992 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5993 {
5994         struct nfs4_layoutget *lgp = calldata;
5995         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5996         struct nfs4_session *session = nfs4_get_session(server);
5997
5998         dprintk("--> %s\n", __func__);
5999         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6000          * right now covering the LAYOUTGET we are about to send.
6001          * However, that is not so catastrophic, and there seems
6002          * to be no way to prevent it completely.
6003          */
6004         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6005                                 &lgp->res.seq_res, task))
6006                 return;
6007         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6008                                           NFS_I(lgp->args.inode)->layout,
6009                                           lgp->args.ctx->state)) {
6010                 rpc_exit(task, NFS4_OK);
6011         }
6012 }
6013
6014 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6015 {
6016         struct nfs4_layoutget *lgp = calldata;
6017         struct inode *inode = lgp->args.inode;
6018         struct nfs_server *server = NFS_SERVER(inode);
6019         struct pnfs_layout_hdr *lo;
6020         struct nfs4_state *state = NULL;
6021
6022         dprintk("--> %s\n", __func__);
6023
6024         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6025                 goto out;
6026
6027         switch (task->tk_status) {
6028         case 0:
6029                 goto out;
6030         case -NFS4ERR_LAYOUTTRYLATER:
6031         case -NFS4ERR_RECALLCONFLICT:
6032                 task->tk_status = -NFS4ERR_DELAY;
6033                 break;
6034         case -NFS4ERR_EXPIRED:
6035         case -NFS4ERR_BAD_STATEID:
6036                 spin_lock(&inode->i_lock);
6037                 lo = NFS_I(inode)->layout;
6038                 if (!lo || list_empty(&lo->plh_segs)) {
6039                         spin_unlock(&inode->i_lock);
6040                         /* If the open stateid was bad, then recover it. */
6041                         state = lgp->args.ctx->state;
6042                 } else {
6043                         LIST_HEAD(head);
6044
6045                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6046                         spin_unlock(&inode->i_lock);
6047                         /* Mark the bad layout state as invalid, then
6048                          * retry using the open stateid. */
6049                         pnfs_free_lseg_list(&head);
6050                 }
6051         }
6052         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6053                 rpc_restart_call_prepare(task);
6054 out:
6055         dprintk("<-- %s\n", __func__);
6056 }
6057
6058 static size_t max_response_pages(struct nfs_server *server)
6059 {
6060         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6061         return nfs_page_array_len(0, max_resp_sz);
6062 }
6063
6064 static void nfs4_free_pages(struct page **pages, size_t size)
6065 {
6066         int i;
6067
6068         if (!pages)
6069                 return;
6070
6071         for (i = 0; i < size; i++) {
6072                 if (!pages[i])
6073                         break;
6074                 __free_page(pages[i]);
6075         }
6076         kfree(pages);
6077 }
6078
6079 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6080 {
6081         struct page **pages;
6082         int i;
6083
6084         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6085         if (!pages) {
6086                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6087                 return NULL;
6088         }
6089
6090         for (i = 0; i < size; i++) {
6091                 pages[i] = alloc_page(gfp_flags);
6092                 if (!pages[i]) {
6093                         dprintk("%s: failed to allocate page\n", __func__);
6094                         nfs4_free_pages(pages, size);
6095                         return NULL;
6096                 }
6097         }
6098
6099         return pages;
6100 }
6101
6102 static void nfs4_layoutget_release(void *calldata)
6103 {
6104         struct nfs4_layoutget *lgp = calldata;
6105         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6106         size_t max_pages = max_response_pages(server);
6107
6108         dprintk("--> %s\n", __func__);
6109         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6110         put_nfs_open_context(lgp->args.ctx);
6111         kfree(calldata);
6112         dprintk("<-- %s\n", __func__);
6113 }
6114
6115 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6116         .rpc_call_prepare = nfs4_layoutget_prepare,
6117         .rpc_call_done = nfs4_layoutget_done,
6118         .rpc_release = nfs4_layoutget_release,
6119 };
6120
6121 struct pnfs_layout_segment *
6122 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6123 {
6124         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6125         size_t max_pages = max_response_pages(server);
6126         struct rpc_task *task;
6127         struct rpc_message msg = {
6128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6129                 .rpc_argp = &lgp->args,
6130                 .rpc_resp = &lgp->res,
6131         };
6132         struct rpc_task_setup task_setup_data = {
6133                 .rpc_client = server->client,
6134                 .rpc_message = &msg,
6135                 .callback_ops = &nfs4_layoutget_call_ops,
6136                 .callback_data = lgp,
6137                 .flags = RPC_TASK_ASYNC,
6138         };
6139         struct pnfs_layout_segment *lseg = NULL;
6140         int status = 0;
6141
6142         dprintk("--> %s\n", __func__);
6143
6144         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6145         if (!lgp->args.layout.pages) {
6146                 nfs4_layoutget_release(lgp);
6147                 return ERR_PTR(-ENOMEM);
6148         }
6149         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6150
6151         lgp->res.layoutp = &lgp->args.layout;
6152         lgp->res.seq_res.sr_slot = NULL;
6153         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6154         task = rpc_run_task(&task_setup_data);
6155         if (IS_ERR(task))
6156                 return ERR_CAST(task);
6157         status = nfs4_wait_for_completion_rpc_task(task);
6158         if (status == 0)
6159                 status = task->tk_status;
6160         if (status == 0)
6161                 lseg = pnfs_layout_process(lgp);
6162         rpc_put_task(task);
6163         dprintk("<-- %s status=%d\n", __func__, status);
6164         if (status)
6165                 return ERR_PTR(status);
6166         return lseg;
6167 }
6168
6169 static void
6170 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6171 {
6172         struct nfs4_layoutreturn *lrp = calldata;
6173
6174         dprintk("--> %s\n", __func__);
6175         nfs41_setup_sequence(lrp->clp->cl_session,
6176                         &lrp->args.seq_args,
6177                         &lrp->res.seq_res,
6178                         task);
6179 }
6180
6181 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6182 {
6183         struct nfs4_layoutreturn *lrp = calldata;
6184         struct nfs_server *server;
6185
6186         dprintk("--> %s\n", __func__);
6187
6188         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6189                 return;
6190
6191         server = NFS_SERVER(lrp->args.inode);
6192         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6193                 rpc_restart_call_prepare(task);
6194                 return;
6195         }
6196         dprintk("<-- %s\n", __func__);
6197 }
6198
6199 static void nfs4_layoutreturn_release(void *calldata)
6200 {
6201         struct nfs4_layoutreturn *lrp = calldata;
6202         struct pnfs_layout_hdr *lo = lrp->args.layout;
6203
6204         dprintk("--> %s\n", __func__);
6205         spin_lock(&lo->plh_inode->i_lock);
6206         if (lrp->res.lrs_present)
6207                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6208         lo->plh_block_lgets--;
6209         spin_unlock(&lo->plh_inode->i_lock);
6210         pnfs_put_layout_hdr(lrp->args.layout);
6211         kfree(calldata);
6212         dprintk("<-- %s\n", __func__);
6213 }
6214
6215 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6216         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6217         .rpc_call_done = nfs4_layoutreturn_done,
6218         .rpc_release = nfs4_layoutreturn_release,
6219 };
6220
6221 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6222 {
6223         struct rpc_task *task;
6224         struct rpc_message msg = {
6225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6226                 .rpc_argp = &lrp->args,
6227                 .rpc_resp = &lrp->res,
6228         };
6229         struct rpc_task_setup task_setup_data = {
6230                 .rpc_client = lrp->clp->cl_rpcclient,
6231                 .rpc_message = &msg,
6232                 .callback_ops = &nfs4_layoutreturn_call_ops,
6233                 .callback_data = lrp,
6234         };
6235         int status;
6236
6237         dprintk("--> %s\n", __func__);
6238         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6239         task = rpc_run_task(&task_setup_data);
6240         if (IS_ERR(task))
6241                 return PTR_ERR(task);
6242         status = task->tk_status;
6243         dprintk("<-- %s status=%d\n", __func__, status);
6244         rpc_put_task(task);
6245         return status;
6246 }
6247
6248 /*
6249  * Retrieve the list of Data Server devices from the MDS.
6250  */
6251 static int _nfs4_getdevicelist(struct nfs_server *server,
6252                                     const struct nfs_fh *fh,
6253                                     struct pnfs_devicelist *devlist)
6254 {
6255         struct nfs4_getdevicelist_args args = {
6256                 .fh = fh,
6257                 .layoutclass = server->pnfs_curr_ld->id,
6258         };
6259         struct nfs4_getdevicelist_res res = {
6260                 .devlist = devlist,
6261         };
6262         struct rpc_message msg = {
6263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6264                 .rpc_argp = &args,
6265                 .rpc_resp = &res,
6266         };
6267         int status;
6268
6269         dprintk("--> %s\n", __func__);
6270         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6271                                 &res.seq_res, 0);
6272         dprintk("<-- %s status=%d\n", __func__, status);
6273         return status;
6274 }
6275
6276 int nfs4_proc_getdevicelist(struct nfs_server *server,
6277                             const struct nfs_fh *fh,
6278                             struct pnfs_devicelist *devlist)
6279 {
6280         struct nfs4_exception exception = { };
6281         int err;
6282
6283         do {
6284                 err = nfs4_handle_exception(server,
6285                                 _nfs4_getdevicelist(server, fh, devlist),
6286                                 &exception);
6287         } while (exception.retry);
6288
6289         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6290                 err, devlist->num_devs);
6291
6292         return err;
6293 }
6294 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6295
6296 static int
6297 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6298 {
6299         struct nfs4_getdeviceinfo_args args = {
6300                 .pdev = pdev,
6301         };
6302         struct nfs4_getdeviceinfo_res res = {
6303                 .pdev = pdev,
6304         };
6305         struct rpc_message msg = {
6306                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6307                 .rpc_argp = &args,
6308                 .rpc_resp = &res,
6309         };
6310         int status;
6311
6312         dprintk("--> %s\n", __func__);
6313         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6314         dprintk("<-- %s status=%d\n", __func__, status);
6315
6316         return status;
6317 }
6318
6319 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6320 {
6321         struct nfs4_exception exception = { };
6322         int err;
6323
6324         do {
6325                 err = nfs4_handle_exception(server,
6326                                         _nfs4_proc_getdeviceinfo(server, pdev),
6327                                         &exception);
6328         } while (exception.retry);
6329         return err;
6330 }
6331 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6332
6333 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6334 {
6335         struct nfs4_layoutcommit_data *data = calldata;
6336         struct nfs_server *server = NFS_SERVER(data->args.inode);
6337         struct nfs4_session *session = nfs4_get_session(server);
6338
6339         nfs41_setup_sequence(session,
6340                         &data->args.seq_args,
6341                         &data->res.seq_res,
6342                         task);
6343 }
6344
6345 static void
6346 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6347 {
6348         struct nfs4_layoutcommit_data *data = calldata;
6349         struct nfs_server *server = NFS_SERVER(data->args.inode);
6350
6351         if (!nfs41_sequence_done(task, &data->res.seq_res))
6352                 return;
6353
6354         switch (task->tk_status) { /* Just ignore these failures */
6355         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6356         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6357         case -NFS4ERR_BADLAYOUT:     /* no layout */
6358         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6359                 task->tk_status = 0;
6360                 break;
6361         case 0:
6362                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6363                                                    data->res.fattr);
6364                 break;
6365         default:
6366                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6367                         rpc_restart_call_prepare(task);
6368                         return;
6369                 }
6370         }
6371 }
6372
6373 static void nfs4_layoutcommit_release(void *calldata)
6374 {
6375         struct nfs4_layoutcommit_data *data = calldata;
6376         struct pnfs_layout_segment *lseg, *tmp;
6377         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6378
6379         pnfs_cleanup_layoutcommit(data);
6380         /* Matched by references in pnfs_set_layoutcommit */
6381         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6382                 list_del_init(&lseg->pls_lc_list);
6383                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6384                                        &lseg->pls_flags))
6385                         pnfs_put_lseg(lseg);
6386         }
6387
6388         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6389         smp_mb__after_clear_bit();
6390         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6391
6392         put_rpccred(data->cred);
6393         kfree(data);
6394 }
6395
6396 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6397         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6398         .rpc_call_done = nfs4_layoutcommit_done,
6399         .rpc_release = nfs4_layoutcommit_release,
6400 };
6401
6402 int
6403 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6404 {
6405         struct rpc_message msg = {
6406                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6407                 .rpc_argp = &data->args,
6408                 .rpc_resp = &data->res,
6409                 .rpc_cred = data->cred,
6410         };
6411         struct rpc_task_setup task_setup_data = {
6412                 .task = &data->task,
6413                 .rpc_client = NFS_CLIENT(data->args.inode),
6414                 .rpc_message = &msg,
6415                 .callback_ops = &nfs4_layoutcommit_ops,
6416                 .callback_data = data,
6417                 .flags = RPC_TASK_ASYNC,
6418         };
6419         struct rpc_task *task;
6420         int status = 0;
6421
6422         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6423                 "lbw: %llu inode %lu\n",
6424                 data->task.tk_pid, sync,
6425                 data->args.lastbytewritten,
6426                 data->args.inode->i_ino);
6427
6428         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6429         task = rpc_run_task(&task_setup_data);
6430         if (IS_ERR(task))
6431                 return PTR_ERR(task);
6432         if (sync == false)
6433                 goto out;
6434         status = nfs4_wait_for_completion_rpc_task(task);
6435         if (status != 0)
6436                 goto out;
6437         status = task->tk_status;
6438 out:
6439         dprintk("%s: status %d\n", __func__, status);
6440         rpc_put_task(task);
6441         return status;
6442 }
6443
6444 static int
6445 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6446                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6447 {
6448         struct nfs41_secinfo_no_name_args args = {
6449                 .style = SECINFO_STYLE_CURRENT_FH,
6450         };
6451         struct nfs4_secinfo_res res = {
6452                 .flavors = flavors,
6453         };
6454         struct rpc_message msg = {
6455                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6456                 .rpc_argp = &args,
6457                 .rpc_resp = &res,
6458         };
6459         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6460 }
6461
6462 static int
6463 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6464                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6465 {
6466         struct nfs4_exception exception = { };
6467         int err;
6468         do {
6469                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6470                 switch (err) {
6471                 case 0:
6472                 case -NFS4ERR_WRONGSEC:
6473                 case -NFS4ERR_NOTSUPP:
6474                         goto out;
6475                 default:
6476                         err = nfs4_handle_exception(server, err, &exception);
6477                 }
6478         } while (exception.retry);
6479 out:
6480         return err;
6481 }
6482
6483 static int
6484 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6485                     struct nfs_fsinfo *info)
6486 {
6487         int err;
6488         struct page *page;
6489         rpc_authflavor_t flavor;
6490         struct nfs4_secinfo_flavors *flavors;
6491
6492         page = alloc_page(GFP_KERNEL);
6493         if (!page) {
6494                 err = -ENOMEM;
6495                 goto out;
6496         }
6497
6498         flavors = page_address(page);
6499         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6500
6501         /*
6502          * Fall back on "guess and check" method if
6503          * the server doesn't support SECINFO_NO_NAME
6504          */
6505         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6506                 err = nfs4_find_root_sec(server, fhandle, info);
6507                 goto out_freepage;
6508         }
6509         if (err)
6510                 goto out_freepage;
6511
6512         flavor = nfs_find_best_sec(flavors);
6513         if (err == 0)
6514                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6515
6516 out_freepage:
6517         put_page(page);
6518         if (err == -EACCES)
6519                 return -EPERM;
6520 out:
6521         return err;
6522 }
6523
6524 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6525 {
6526         int status;
6527         struct nfs41_test_stateid_args args = {
6528                 .stateid = stateid,
6529         };
6530         struct nfs41_test_stateid_res res;
6531         struct rpc_message msg = {
6532                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6533                 .rpc_argp = &args,
6534                 .rpc_resp = &res,
6535         };
6536
6537         dprintk("NFS call  test_stateid %p\n", stateid);
6538         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6539         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6540         if (status != NFS_OK) {
6541                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6542                 return status;
6543         }
6544         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6545         return -res.status;
6546 }
6547
6548 /**
6549  * nfs41_test_stateid - perform a TEST_STATEID operation
6550  *
6551  * @server: server / transport on which to perform the operation
6552  * @stateid: state ID to test
6553  *
6554  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6555  * Otherwise a negative NFS4ERR value is returned if the operation
6556  * failed or the state ID is not currently valid.
6557  */
6558 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6559 {
6560         struct nfs4_exception exception = { };
6561         int err;
6562         do {
6563                 err = _nfs41_test_stateid(server, stateid);
6564                 if (err != -NFS4ERR_DELAY)
6565                         break;
6566                 nfs4_handle_exception(server, err, &exception);
6567         } while (exception.retry);
6568         return err;
6569 }
6570
6571 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6572 {
6573         struct nfs41_free_stateid_args args = {
6574                 .stateid = stateid,
6575         };
6576         struct nfs41_free_stateid_res res;
6577         struct rpc_message msg = {
6578                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6579                 .rpc_argp = &args,
6580                 .rpc_resp = &res,
6581         };
6582         int status;
6583
6584         dprintk("NFS call  free_stateid %p\n", stateid);
6585         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6586         status = nfs4_call_sync_sequence(server->client, server, &msg,
6587                                          &args.seq_args, &res.seq_res, 1);
6588         dprintk("NFS reply free_stateid: %d\n", status);
6589         return status;
6590 }
6591
6592 /**
6593  * nfs41_free_stateid - perform a FREE_STATEID operation
6594  *
6595  * @server: server / transport on which to perform the operation
6596  * @stateid: state ID to release
6597  *
6598  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6599  * negative NFS4ERR value is returned.
6600  */
6601 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6602 {
6603         struct nfs4_exception exception = { };
6604         int err;
6605         do {
6606                 err = _nfs4_free_stateid(server, stateid);
6607                 if (err != -NFS4ERR_DELAY)
6608                         break;
6609                 nfs4_handle_exception(server, err, &exception);
6610         } while (exception.retry);
6611         return err;
6612 }
6613
6614 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6615                 const nfs4_stateid *s2)
6616 {
6617         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6618                 return false;
6619
6620         if (s1->seqid == s2->seqid)
6621                 return true;
6622         if (s1->seqid == 0 || s2->seqid == 0)
6623                 return true;
6624
6625         return false;
6626 }
6627
6628 #endif /* CONFIG_NFS_V4_1 */
6629
6630 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6631                 const nfs4_stateid *s2)
6632 {
6633         return nfs4_stateid_match(s1, s2);
6634 }
6635
6636
6637 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6638         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6639         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6640         .recover_open   = nfs4_open_reclaim,
6641         .recover_lock   = nfs4_lock_reclaim,
6642         .establish_clid = nfs4_init_clientid,
6643         .get_clid_cred  = nfs4_get_setclientid_cred,
6644         .detect_trunking = nfs40_discover_server_trunking,
6645 };
6646
6647 #if defined(CONFIG_NFS_V4_1)
6648 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6649         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6650         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6651         .recover_open   = nfs4_open_reclaim,
6652         .recover_lock   = nfs4_lock_reclaim,
6653         .establish_clid = nfs41_init_clientid,
6654         .get_clid_cred  = nfs4_get_exchange_id_cred,
6655         .reclaim_complete = nfs41_proc_reclaim_complete,
6656         .detect_trunking = nfs41_discover_server_trunking,
6657 };
6658 #endif /* CONFIG_NFS_V4_1 */
6659
6660 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6661         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6662         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6663         .recover_open   = nfs4_open_expired,
6664         .recover_lock   = nfs4_lock_expired,
6665         .establish_clid = nfs4_init_clientid,
6666         .get_clid_cred  = nfs4_get_setclientid_cred,
6667 };
6668
6669 #if defined(CONFIG_NFS_V4_1)
6670 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6671         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6672         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6673         .recover_open   = nfs41_open_expired,
6674         .recover_lock   = nfs41_lock_expired,
6675         .establish_clid = nfs41_init_clientid,
6676         .get_clid_cred  = nfs4_get_exchange_id_cred,
6677 };
6678 #endif /* CONFIG_NFS_V4_1 */
6679
6680 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6681         .sched_state_renewal = nfs4_proc_async_renew,
6682         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6683         .renew_lease = nfs4_proc_renew,
6684 };
6685
6686 #if defined(CONFIG_NFS_V4_1)
6687 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6688         .sched_state_renewal = nfs41_proc_async_sequence,
6689         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6690         .renew_lease = nfs4_proc_sequence,
6691 };
6692 #endif
6693
6694 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6695         .minor_version = 0,
6696         .call_sync = _nfs4_call_sync,
6697         .match_stateid = nfs4_match_stateid,
6698         .find_root_sec = nfs4_find_root_sec,
6699         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6700         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6701         .state_renewal_ops = &nfs40_state_renewal_ops,
6702 };
6703
6704 #if defined(CONFIG_NFS_V4_1)
6705 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6706         .minor_version = 1,
6707         .call_sync = _nfs4_call_sync_session,
6708         .match_stateid = nfs41_match_stateid,
6709         .find_root_sec = nfs41_find_root_sec,
6710         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6711         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6712         .state_renewal_ops = &nfs41_state_renewal_ops,
6713 };
6714 #endif
6715
6716 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6717         [0] = &nfs_v4_0_minor_ops,
6718 #if defined(CONFIG_NFS_V4_1)
6719         [1] = &nfs_v4_1_minor_ops,
6720 #endif
6721 };
6722
6723 const struct inode_operations nfs4_dir_inode_operations = {
6724         .create         = nfs_create,
6725         .lookup         = nfs_lookup,
6726         .atomic_open    = nfs_atomic_open,
6727         .link           = nfs_link,
6728         .unlink         = nfs_unlink,
6729         .symlink        = nfs_symlink,
6730         .mkdir          = nfs_mkdir,
6731         .rmdir          = nfs_rmdir,
6732         .mknod          = nfs_mknod,
6733         .rename         = nfs_rename,
6734         .permission     = nfs_permission,
6735         .getattr        = nfs_getattr,
6736         .setattr        = nfs_setattr,
6737         .getxattr       = generic_getxattr,
6738         .setxattr       = generic_setxattr,
6739         .listxattr      = generic_listxattr,
6740         .removexattr    = generic_removexattr,
6741 };
6742
6743 static const struct inode_operations nfs4_file_inode_operations = {
6744         .permission     = nfs_permission,
6745         .getattr        = nfs_getattr,
6746         .setattr        = nfs_setattr,
6747         .getxattr       = generic_getxattr,
6748         .setxattr       = generic_setxattr,
6749         .listxattr      = generic_listxattr,
6750         .removexattr    = generic_removexattr,
6751 };
6752
6753 const struct nfs_rpc_ops nfs_v4_clientops = {
6754         .version        = 4,                    /* protocol version */
6755         .dentry_ops     = &nfs4_dentry_operations,
6756         .dir_inode_ops  = &nfs4_dir_inode_operations,
6757         .file_inode_ops = &nfs4_file_inode_operations,
6758         .file_ops       = &nfs4_file_operations,
6759         .getroot        = nfs4_proc_get_root,
6760         .submount       = nfs4_submount,
6761         .try_mount      = nfs4_try_mount,
6762         .getattr        = nfs4_proc_getattr,
6763         .setattr        = nfs4_proc_setattr,
6764         .lookup         = nfs4_proc_lookup,
6765         .access         = nfs4_proc_access,
6766         .readlink       = nfs4_proc_readlink,
6767         .create         = nfs4_proc_create,
6768         .remove         = nfs4_proc_remove,
6769         .unlink_setup   = nfs4_proc_unlink_setup,
6770         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6771         .unlink_done    = nfs4_proc_unlink_done,
6772         .rename         = nfs4_proc_rename,
6773         .rename_setup   = nfs4_proc_rename_setup,
6774         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6775         .rename_done    = nfs4_proc_rename_done,
6776         .link           = nfs4_proc_link,
6777         .symlink        = nfs4_proc_symlink,
6778         .mkdir          = nfs4_proc_mkdir,
6779         .rmdir          = nfs4_proc_remove,
6780         .readdir        = nfs4_proc_readdir,
6781         .mknod          = nfs4_proc_mknod,
6782         .statfs         = nfs4_proc_statfs,
6783         .fsinfo         = nfs4_proc_fsinfo,
6784         .pathconf       = nfs4_proc_pathconf,
6785         .set_capabilities = nfs4_server_capabilities,
6786         .decode_dirent  = nfs4_decode_dirent,
6787         .read_setup     = nfs4_proc_read_setup,
6788         .read_pageio_init = pnfs_pageio_init_read,
6789         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6790         .read_done      = nfs4_read_done,
6791         .write_setup    = nfs4_proc_write_setup,
6792         .write_pageio_init = pnfs_pageio_init_write,
6793         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6794         .write_done     = nfs4_write_done,
6795         .commit_setup   = nfs4_proc_commit_setup,
6796         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6797         .commit_done    = nfs4_commit_done,
6798         .lock           = nfs4_proc_lock,
6799         .clear_acl_cache = nfs4_zap_acl_attr,
6800         .close_context  = nfs4_close_context,
6801         .open_context   = nfs4_atomic_open,
6802         .have_delegation = nfs4_have_delegation,
6803         .return_delegation = nfs4_inode_return_delegation,
6804         .alloc_client   = nfs4_alloc_client,
6805         .init_client    = nfs4_init_client,
6806         .free_client    = nfs4_free_client,
6807         .create_server  = nfs4_create_server,
6808         .clone_server   = nfs_clone_server,
6809 };
6810
6811 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6812         .prefix = XATTR_NAME_NFSV4_ACL,
6813         .list   = nfs4_xattr_list_nfs4_acl,
6814         .get    = nfs4_xattr_get_nfs4_acl,
6815         .set    = nfs4_xattr_set_nfs4_acl,
6816 };
6817
6818 const struct xattr_handler *nfs4_xattr_handlers[] = {
6819         &nfs4_xattr_nfs4_acl_handler,
6820         NULL
6821 };
6822
6823 /*
6824  * Local variables:
6825  *  c-basic-offset: 8
6826  * End:
6827  */