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                 dprintk("%s session is draining\n", __func__);
 527                 goto out_sleep;
 528         }
 529
 530         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 531             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 532                 dprintk("%s enforce FIFO order\n", __func__);
 533                 goto out_sleep;
 534         }
 535
 536         slot = nfs4_alloc_slot(tbl);
 537         if (IS_ERR(slot)) {
 538                 /* If out of memory, try again in 1/4 second */
 539                 if (slot == ERR_PTR(-ENOMEM))
 540                         task->tk_timeout = HZ >> 2;
 541                 dprintk("<-- %s: no free slots\n", __func__);
 542                 goto out_sleep;
 543         }
 544         spin_unlock(&tbl->slot_tbl_lock);
 545
 546         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 547
 548         args->sa_slot = slot;
 549
 550         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 551                         slot->slot_nr, slot->seq_nr);
 552
 553         res->sr_slot = slot;
 554         res->sr_status_flags = 0;
 555         /*
 556          * sr_status is only set in decode_sequence, and so will remain
 557          * set to 1 if an rpc level failure occurs.
 558          */
 559         res->sr_status = 1;
 560 out_success:
 561         rpc_call_start(task);
 562         return 0;
 563 out_sleep:
 564         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 565         spin_unlock(&tbl->slot_tbl_lock);
 566         return -EAGAIN;
 567 }
 568 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 569
 570 int nfs4_setup_sequence(const struct nfs_server *server,
 571                         struct nfs4_sequence_args *args,
 572                         struct nfs4_sequence_res *res,
 573                         struct rpc_task *task)
 574 {
 575         struct nfs4_session *session = nfs4_get_session(server);
 576         int ret = 0;
 577
 578         if (session == NULL) {
 579                 rpc_call_start(task);
 580                 goto out;
 581         }
 582
 583         dprintk("--> %s clp %p session %p sr_slot %d\n",
 584                 __func__, session->clp, session, res->sr_slot ?
 585                         res->sr_slot->slot_nr : -1);
 586
 587         ret = nfs41_setup_sequence(session, args, res, task);
 588 out:
 589         dprintk("<-- %s status=%d\n", __func__, ret);
 590         return ret;
 591 }
 592
 593 struct nfs41_call_sync_data {
 594         const struct nfs_server *seq_server;
 595         struct nfs4_sequence_args *seq_args;
 596         struct nfs4_sequence_res *seq_res;
 597 };
 598
 599 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 600 {
 601         struct nfs41_call_sync_data *data = calldata;
 602         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 603
 604         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 605
 606         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 607 }
 608
 609 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 610 {
 611         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 612         nfs41_call_sync_prepare(task, calldata);
 613 }
 614
 615 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 616 {
 617         struct nfs41_call_sync_data *data = calldata;
 618
 619         nfs41_sequence_done(task, data->seq_res);
 620 }
 621
 622 static const struct rpc_call_ops nfs41_call_sync_ops = {
 623         .rpc_call_prepare = nfs41_call_sync_prepare,
 624         .rpc_call_done = nfs41_call_sync_done,
 625 };
 626
 627 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 628         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 629         .rpc_call_done = nfs41_call_sync_done,
 630 };
 631
 632 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 633                                    struct nfs_server *server,
 634                                    struct rpc_message *msg,
 635                                    struct nfs4_sequence_args *args,
 636                                    struct nfs4_sequence_res *res,
 637                                    int privileged)
 638 {
 639         int ret;
 640         struct rpc_task *task;
 641         struct nfs41_call_sync_data data = {
 642                 .seq_server = server,
 643                 .seq_args = args,
 644                 .seq_res = res,
 645         };
 646         struct rpc_task_setup task_setup = {
 647                 .rpc_client = clnt,
 648                 .rpc_message = msg,
 649                 .callback_ops = &nfs41_call_sync_ops,
 650                 .callback_data = &data
 651         };
 652
 653         if (privileged)
 654                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 655         task = rpc_run_task(&task_setup);
 656         if (IS_ERR(task))
 657                 ret = PTR_ERR(task);
 658         else {
 659                 ret = task->tk_status;
 660                 rpc_put_task(task);
 661         }
 662         return ret;
 663 }
 664
 665 static
 666 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 667                             struct nfs_server *server,
 668                             struct rpc_message *msg,
 669                             struct nfs4_sequence_args *args,
 670                             struct nfs4_sequence_res *res)
 671 {
 672         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 673 }
 674
 675 #else
 676 static inline
 677 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 678                 struct nfs4_sequence_res *res, int cache_reply)
 679 {
 680 }
 681
 682 static int nfs4_sequence_done(struct rpc_task *task,
 683                                struct nfs4_sequence_res *res)
 684 {
 685         return 1;
 686 }
 687 #endif /* CONFIG_NFS_V4_1 */
 688
 689 static
 690 int _nfs4_call_sync(struct rpc_clnt *clnt,
 691                     struct nfs_server *server,
 692                     struct rpc_message *msg,
 693                     struct nfs4_sequence_args *args,
 694                     struct nfs4_sequence_res *res)
 695 {
 696         return rpc_call_sync(clnt, msg, 0);
 697 }
 698
 699 static
 700 int nfs4_call_sync(struct rpc_clnt *clnt,
 701                    struct nfs_server *server,
 702                    struct rpc_message *msg,
 703                    struct nfs4_sequence_args *args,
 704                    struct nfs4_sequence_res *res,
 705                    int cache_reply)
 706 {
 707         nfs41_init_sequence(args, res, cache_reply);
 708         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 709                                                 args, res);
 710 }
 711
 712 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 713 {
 714         struct nfs_inode *nfsi = NFS_I(dir);
 715
 716         spin_lock(&dir->i_lock);
 717         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 718         if (!cinfo->atomic || cinfo->before != dir->i_version)
 719                 nfs_force_lookup_revalidate(dir);
 720         dir->i_version = cinfo->after;
 721         spin_unlock(&dir->i_lock);
 722 }
 723
 724 struct nfs4_opendata {
 725         struct kref kref;
 726         struct nfs_openargs o_arg;
 727         struct nfs_openres o_res;
 728         struct nfs_open_confirmargs c_arg;
 729         struct nfs_open_confirmres c_res;
 730         struct nfs4_string owner_name;
 731         struct nfs4_string group_name;
 732         struct nfs_fattr f_attr;
 733         struct dentry *dir;
 734         struct dentry *dentry;
 735         struct nfs4_state_owner *owner;
 736         struct nfs4_state *state;
 737         struct iattr attrs;
 738         unsigned long timestamp;
 739         unsigned int rpc_done : 1;
 740         int rpc_status;
 741         int cancelled;
 742 };
 743
 744
 745 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 746 {
 747         p->o_res.f_attr = &p->f_attr;
 748         p->o_res.seqid = p->o_arg.seqid;
 749         p->c_res.seqid = p->c_arg.seqid;
 750         p->o_res.server = p->o_arg.server;
 751         p->o_res.access_request = p->o_arg.access;
 752         nfs_fattr_init(&p->f_attr);
 753         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 754 }
 755
 756 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 757                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 758                 const struct iattr *attrs,
 759                 gfp_t gfp_mask)
 760 {
 761         struct dentry *parent = dget_parent(dentry);
 762         struct inode *dir = parent->d_inode;
 763         struct nfs_server *server = NFS_SERVER(dir);
 764         struct nfs4_opendata *p;
 765
 766         p = kzalloc(sizeof(*p), gfp_mask);
 767         if (p == NULL)
 768                 goto err;
 769         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 770         if (p->o_arg.seqid == NULL)
 771                 goto err_free;
 772         nfs_sb_active(dentry->d_sb);
 773         p->dentry = dget(dentry);
 774         p->dir = parent;
 775         p->owner = sp;
 776         atomic_inc(&sp->so_count);
 777         p->o_arg.fh = NFS_FH(dir);
 778         p->o_arg.open_flags = flags;
 779         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 780         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 781          * will return permission denied for all bits until close */
 782         if (!(flags & O_EXCL)) {
 783                 /* ask server to check for all possible rights as results
 784                  * are cached */
 785                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 786                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 787         }
 788         p->o_arg.clientid = server->nfs_client->cl_clientid;
 789         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 790         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 791         p->o_arg.name = &dentry->d_name;
 792         p->o_arg.server = server;
 793         p->o_arg.bitmask = server->attr_bitmask;
 794         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 795         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 796         if (attrs != NULL && attrs->ia_valid != 0) {
 797                 __be32 verf[2];
 798
 799                 p->o_arg.u.attrs = &p->attrs;
 800                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 801
 802                 verf[0] = jiffies;
 803                 verf[1] = current->pid;
 804                 memcpy(p->o_arg.u.verifier.data, verf,
 805                                 sizeof(p->o_arg.u.verifier.data));
 806         }
 807         p->c_arg.fh = &p->o_res.fh;
 808         p->c_arg.stateid = &p->o_res.stateid;
 809         p->c_arg.seqid = p->o_arg.seqid;
 810         nfs4_init_opendata_res(p);
 811         kref_init(&p->kref);
 812         return p;
 813 err_free:
 814         kfree(p);
 815 err:
 816         dput(parent);
 817         return NULL;
 818 }
 819
 820 static void nfs4_opendata_free(struct kref *kref)
 821 {
 822         struct nfs4_opendata *p = container_of(kref,
 823                         struct nfs4_opendata, kref);
 824         struct super_block *sb = p->dentry->d_sb;
 825
 826         nfs_free_seqid(p->o_arg.seqid);
 827         if (p->state != NULL)
 828                 nfs4_put_open_state(p->state);
 829         nfs4_put_state_owner(p->owner);
 830         dput(p->dir);
 831         dput(p->dentry);
 832         nfs_sb_deactive(sb);
 833         nfs_fattr_free_names(&p->f_attr);
 834         kfree(p);
 835 }
 836
 837 static void nfs4_opendata_put(struct nfs4_opendata *p)
 838 {
 839         if (p != NULL)
 840                 kref_put(&p->kref, nfs4_opendata_free);
 841 }
 842
 843 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 844 {
 845         int ret;
 846
 847         ret = rpc_wait_for_completion_task(task);
 848         return ret;
 849 }
 850
 851 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 852 {
 853         int ret = 0;
 854
 855         if (open_mode & (O_EXCL|O_TRUNC))
 856                 goto out;
 857         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 858                 case FMODE_READ:
 859                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 860                                 && state->n_rdonly != 0;
 861                         break;
 862                 case FMODE_WRITE:
 863                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 864                                 && state->n_wronly != 0;
 865                         break;
 866                 case FMODE_READ|FMODE_WRITE:
 867                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 868                                 && state->n_rdwr != 0;
 869         }
 870 out:
 871         return ret;
 872 }
 873
 874 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 875 {
 876         if (delegation == NULL)
 877                 return 0;
 878         if ((delegation->type & fmode) != fmode)
 879                 return 0;
 880         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 881                 return 0;
 882         nfs_mark_delegation_referenced(delegation);
 883         return 1;
 884 }
 885
 886 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 887 {
 888         switch (fmode) {
 889                 case FMODE_WRITE:
 890                         state->n_wronly++;
 891                         break;
 892                 case FMODE_READ:
 893                         state->n_rdonly++;
 894                         break;
 895                 case FMODE_READ|FMODE_WRITE:
 896                         state->n_rdwr++;
 897         }
 898         nfs4_state_set_mode_locked(state, state->state | fmode);
 899 }
 900
 901 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 902 {
 903         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 904                 nfs4_stateid_copy(&state->stateid, stateid);
 905         nfs4_stateid_copy(&state->open_stateid, stateid);
 906         switch (fmode) {
 907                 case FMODE_READ:
 908                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 909                         break;
 910                 case FMODE_WRITE:
 911                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 912                         break;
 913                 case FMODE_READ|FMODE_WRITE:
 914                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 915         }
 916 }
 917
 918 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 919 {
 920         write_seqlock(&state->seqlock);
 921         nfs_set_open_stateid_locked(state, stateid, fmode);
 922         write_sequnlock(&state->seqlock);
 923 }
 924
 925 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 926 {
 927         /*
 928          * Protect the call to nfs4_state_set_mode_locked and
 929          * serialise the stateid update
 930          */
 931         write_seqlock(&state->seqlock);
 932         if (deleg_stateid != NULL) {
 933                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 934                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 935         }
 936         if (open_stateid != NULL)
 937                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 938         write_sequnlock(&state->seqlock);
 939         spin_lock(&state->owner->so_lock);
 940         update_open_stateflags(state, fmode);
 941         spin_unlock(&state->owner->so_lock);
 942 }
 943
 944 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 945 {
 946         struct nfs_inode *nfsi = NFS_I(state->inode);
 947         struct nfs_delegation *deleg_cur;
 948         int ret = 0;
 949
 950         fmode &= (FMODE_READ|FMODE_WRITE);
 951
 952         rcu_read_lock();
 953         deleg_cur = rcu_dereference(nfsi->delegation);
 954         if (deleg_cur == NULL)
 955                 goto no_delegation;
 956
 957         spin_lock(&deleg_cur->lock);
 958         if (nfsi->delegation != deleg_cur ||
 959             (deleg_cur->type & fmode) != fmode)
 960                 goto no_delegation_unlock;
 961
 962         if (delegation == NULL)
 963                 delegation = &deleg_cur->stateid;
 964         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 965                 goto no_delegation_unlock;
 966
 967         nfs_mark_delegation_referenced(deleg_cur);
 968         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 969         ret = 1;
 970 no_delegation_unlock:
 971         spin_unlock(&deleg_cur->lock);
 972 no_delegation:
 973         rcu_read_unlock();
 974
 975         if (!ret && open_stateid != NULL) {
 976                 __update_open_stateid(state, open_stateid, NULL, fmode);
 977                 ret = 1;
 978         }
 979
 980         return ret;
 981 }
 982
 983
 984 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 985 {
 986         struct nfs_delegation *delegation;
 987
 988         rcu_read_lock();
 989         delegation = rcu_dereference(NFS_I(inode)->delegation);
 990         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 991                 rcu_read_unlock();
 992                 return;
 993         }
 994         rcu_read_unlock();
 995         nfs4_inode_return_delegation(inode);
 996 }
 997
 998 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 999 {
1000         struct nfs4_state *state = opendata->state;
1001         struct nfs_inode *nfsi = NFS_I(state->inode);
1002         struct nfs_delegation *delegation;
1003         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1004         fmode_t fmode = opendata->o_arg.fmode;
1005         nfs4_stateid stateid;
1006         int ret = -EAGAIN;
1007
1008         for (;;) {
1009                 if (can_open_cached(state, fmode, open_mode)) {
1010                         spin_lock(&state->owner->so_lock);
1011                         if (can_open_cached(state, fmode, open_mode)) {
1012                                 update_open_stateflags(state, fmode);
1013                                 spin_unlock(&state->owner->so_lock);
1014                                 goto out_return_state;
1015                         }
1016                         spin_unlock(&state->owner->so_lock);
1017                 }
1018                 rcu_read_lock();
1019                 delegation = rcu_dereference(nfsi->delegation);
1020                 if (!can_open_delegated(delegation, fmode)) {
1021                         rcu_read_unlock();
1022                         break;
1023                 }
1024                 /* Save the delegation */
1025                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1026                 rcu_read_unlock();
1027                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1028                 if (ret != 0)
1029                         goto out;
1030                 ret = -EAGAIN;
1031
1032                 /* Try to update the stateid using the delegation */
1033                 if (update_open_stateid(state, NULL, &stateid, fmode))
1034                         goto out_return_state;
1035         }
1036 out:
1037         return ERR_PTR(ret);
1038 out_return_state:
1039         atomic_inc(&state->count);
1040         return state;
1041 }
1042
1043 static void
1044 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1045 {
1046         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1047         struct nfs_delegation *delegation;
1048         int delegation_flags = 0;
1049
1050         rcu_read_lock();
1051         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1052         if (delegation)
1053                 delegation_flags = delegation->flags;
1054         rcu_read_unlock();
1055         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1056                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1057                                    "returning a delegation for "
1058                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1059                                    clp->cl_hostname);
1060         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1061                 nfs_inode_set_delegation(state->inode,
1062                                          data->owner->so_cred,
1063                                          &data->o_res);
1064         else
1065                 nfs_inode_reclaim_delegation(state->inode,
1066                                              data->owner->so_cred,
1067                                              &data->o_res);
1068 }
1069
1070 /*
1071  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1072  * and update the nfs4_state.
1073  */
1074 static struct nfs4_state *
1075 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1076 {
1077         struct inode *inode = data->state->inode;
1078         struct nfs4_state *state = data->state;
1079         int ret;
1080
1081         if (!data->rpc_done) {
1082                 ret = data->rpc_status;
1083                 goto err;
1084         }
1085
1086         ret = -ESTALE;
1087         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1088             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1089             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1090                 goto err;
1091
1092         ret = -ENOMEM;
1093         state = nfs4_get_open_state(inode, data->owner);
1094         if (state == NULL)
1095                 goto err;
1096
1097         ret = nfs_refresh_inode(inode, &data->f_attr);
1098         if (ret)
1099                 goto err;
1100
1101         if (data->o_res.delegation_type != 0)
1102                 nfs4_opendata_check_deleg(data, state);
1103         update_open_stateid(state, &data->o_res.stateid, NULL,
1104                             data->o_arg.fmode);
1105
1106         return state;
1107 err:
1108         return ERR_PTR(ret);
1109
1110 }
1111
1112 static struct nfs4_state *
1113 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1114 {
1115         struct inode *inode;
1116         struct nfs4_state *state = NULL;
1117         int ret;
1118
1119         if (!data->rpc_done) {
1120                 state = nfs4_try_open_cached(data);
1121                 goto out;
1122         }
1123
1124         ret = -EAGAIN;
1125         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1126                 goto err;
1127         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1128         ret = PTR_ERR(inode);
1129         if (IS_ERR(inode))
1130                 goto err;
1131         ret = -ENOMEM;
1132         state = nfs4_get_open_state(inode, data->owner);
1133         if (state == NULL)
1134                 goto err_put_inode;
1135         if (data->o_res.delegation_type != 0)
1136                 nfs4_opendata_check_deleg(data, state);
1137         update_open_stateid(state, &data->o_res.stateid, NULL,
1138                         data->o_arg.fmode);
1139         iput(inode);
1140 out:
1141         return state;
1142 err_put_inode:
1143         iput(inode);
1144 err:
1145         return ERR_PTR(ret);
1146 }
1147
1148 static struct nfs4_state *
1149 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1150 {
1151         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1152                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1153         return _nfs4_opendata_to_nfs4_state(data);
1154 }
1155
1156 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1157 {
1158         struct nfs_inode *nfsi = NFS_I(state->inode);
1159         struct nfs_open_context *ctx;
1160
1161         spin_lock(&state->inode->i_lock);
1162         list_for_each_entry(ctx, &nfsi->open_files, list) {
1163                 if (ctx->state != state)
1164                         continue;
1165                 get_nfs_open_context(ctx);
1166                 spin_unlock(&state->inode->i_lock);
1167                 return ctx;
1168         }
1169         spin_unlock(&state->inode->i_lock);
1170         return ERR_PTR(-ENOENT);
1171 }
1172
1173 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1174 {
1175         struct nfs4_opendata *opendata;
1176
1177         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1178         if (opendata == NULL)
1179                 return ERR_PTR(-ENOMEM);
1180         opendata->state = state;
1181         atomic_inc(&state->count);
1182         return opendata;
1183 }
1184
1185 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1186 {
1187         struct nfs4_state *newstate;
1188         int ret;
1189
1190         opendata->o_arg.open_flags = 0;
1191         opendata->o_arg.fmode = fmode;
1192         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1193         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1194         nfs4_init_opendata_res(opendata);
1195         ret = _nfs4_recover_proc_open(opendata);
1196         if (ret != 0)
1197                 return ret;
1198         newstate = nfs4_opendata_to_nfs4_state(opendata);
1199         if (IS_ERR(newstate))
1200                 return PTR_ERR(newstate);
1201         nfs4_close_state(newstate, fmode);
1202         *res = newstate;
1203         return 0;
1204 }
1205
1206 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1207 {
1208         struct nfs4_state *newstate;
1209         int ret;
1210
1211         /* memory barrier prior to reading state->n_* */
1212         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1213         smp_rmb();
1214         if (state->n_rdwr != 0) {
1215                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1216                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1217                 if (ret != 0)
1218                         return ret;
1219                 if (newstate != state)
1220                         return -ESTALE;
1221         }
1222         if (state->n_wronly != 0) {
1223                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1224                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1225                 if (ret != 0)
1226                         return ret;
1227                 if (newstate != state)
1228                         return -ESTALE;
1229         }
1230         if (state->n_rdonly != 0) {
1231                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1232                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1233                 if (ret != 0)
1234                         return ret;
1235                 if (newstate != state)
1236                         return -ESTALE;
1237         }
1238         /*
1239          * We may have performed cached opens for all three recoveries.
1240          * Check if we need to update the current stateid.
1241          */
1242         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1243             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1244                 write_seqlock(&state->seqlock);
1245                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1246                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1247                 write_sequnlock(&state->seqlock);
1248         }
1249         return 0;
1250 }
1251
1252 /*
1253  * OPEN_RECLAIM:
1254  *      reclaim state on the server after a reboot.
1255  */
1256 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1257 {
1258         struct nfs_delegation *delegation;
1259         struct nfs4_opendata *opendata;
1260         fmode_t delegation_type = 0;
1261         int status;
1262
1263         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1264         if (IS_ERR(opendata))
1265                 return PTR_ERR(opendata);
1266         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1267         opendata->o_arg.fh = NFS_FH(state->inode);
1268         rcu_read_lock();
1269         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1270         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1271                 delegation_type = delegation->type;
1272         rcu_read_unlock();
1273         opendata->o_arg.u.delegation_type = delegation_type;
1274         status = nfs4_open_recover(opendata, state);
1275         nfs4_opendata_put(opendata);
1276         return status;
1277 }
1278
1279 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1280 {
1281         struct nfs_server *server = NFS_SERVER(state->inode);
1282         struct nfs4_exception exception = { };
1283         int err;
1284         do {
1285                 err = _nfs4_do_open_reclaim(ctx, state);
1286                 if (err != -NFS4ERR_DELAY)
1287                         break;
1288                 nfs4_handle_exception(server, err, &exception);
1289         } while (exception.retry);
1290         return err;
1291 }
1292
1293 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1294 {
1295         struct nfs_open_context *ctx;
1296         int ret;
1297
1298         ctx = nfs4_state_find_open_context(state);
1299         if (IS_ERR(ctx))
1300                 return PTR_ERR(ctx);
1301         ret = nfs4_do_open_reclaim(ctx, state);
1302         put_nfs_open_context(ctx);
1303         return ret;
1304 }
1305
1306 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1307 {
1308         struct nfs4_opendata *opendata;
1309         int ret;
1310
1311         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1312         if (IS_ERR(opendata))
1313                 return PTR_ERR(opendata);
1314         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1315         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1316         ret = nfs4_open_recover(opendata, state);
1317         nfs4_opendata_put(opendata);
1318         return ret;
1319 }
1320
1321 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1322 {
1323         struct nfs4_exception exception = { };
1324         struct nfs_server *server = NFS_SERVER(state->inode);
1325         int err;
1326         do {
1327                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1328                 switch (err) {
1329                         case 0:
1330                         case -ENOENT:
1331                         case -ESTALE:
1332                                 goto out;
1333                         case -NFS4ERR_BADSESSION:
1334                         case -NFS4ERR_BADSLOT:
1335                         case -NFS4ERR_BAD_HIGH_SLOT:
1336                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1337                         case -NFS4ERR_DEADSESSION:
1338                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1339                                 goto out;
1340                         case -NFS4ERR_STALE_CLIENTID:
1341                         case -NFS4ERR_STALE_STATEID:
1342                         case -NFS4ERR_EXPIRED:
1343                                 /* Don't recall a delegation if it was lost */
1344                                 nfs4_schedule_lease_recovery(server->nfs_client);
1345                                 goto out;
1346                         case -ERESTARTSYS:
1347                                 /*
1348                                  * The show must go on: exit, but mark the
1349                                  * stateid as needing recovery.
1350                                  */
1351                         case -NFS4ERR_DELEG_REVOKED:
1352                         case -NFS4ERR_ADMIN_REVOKED:
1353                         case -NFS4ERR_BAD_STATEID:
1354                                 nfs_inode_find_state_and_recover(state->inode,
1355                                                 stateid);
1356                                 nfs4_schedule_stateid_recovery(server, state);
1357                         case -EKEYEXPIRED:
1358                                 /*
1359                                  * User RPCSEC_GSS context has expired.
1360                                  * We cannot recover this stateid now, so
1361                                  * skip it and allow recovery thread to
1362                                  * proceed.
1363                                  */
1364                         case -ENOMEM:
1365                                 err = 0;
1366                                 goto out;
1367                 }
1368                 err = nfs4_handle_exception(server, err, &exception);
1369         } while (exception.retry);
1370 out:
1371         return err;
1372 }
1373
1374 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1375 {
1376         struct nfs4_opendata *data = calldata;
1377
1378         data->rpc_status = task->tk_status;
1379         if (data->rpc_status == 0) {
1380                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1381                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1382                 renew_lease(data->o_res.server, data->timestamp);
1383                 data->rpc_done = 1;
1384         }
1385 }
1386
1387 static void nfs4_open_confirm_release(void *calldata)
1388 {
1389         struct nfs4_opendata *data = calldata;
1390         struct nfs4_state *state = NULL;
1391
1392         /* If this request hasn't been cancelled, do nothing */
1393         if (data->cancelled == 0)
1394                 goto out_free;
1395         /* In case of error, no cleanup! */
1396         if (!data->rpc_done)
1397                 goto out_free;
1398         state = nfs4_opendata_to_nfs4_state(data);
1399         if (!IS_ERR(state))
1400                 nfs4_close_state(state, data->o_arg.fmode);
1401 out_free:
1402         nfs4_opendata_put(data);
1403 }
1404
1405 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1406         .rpc_call_done = nfs4_open_confirm_done,
1407         .rpc_release = nfs4_open_confirm_release,
1408 };
1409
1410 /*
1411  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1412  */
1413 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1414 {
1415         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1416         struct rpc_task *task;
1417         struct  rpc_message msg = {
1418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1419                 .rpc_argp = &data->c_arg,
1420                 .rpc_resp = &data->c_res,
1421                 .rpc_cred = data->owner->so_cred,
1422         };
1423         struct rpc_task_setup task_setup_data = {
1424                 .rpc_client = server->client,
1425                 .rpc_message = &msg,
1426                 .callback_ops = &nfs4_open_confirm_ops,
1427                 .callback_data = data,
1428                 .workqueue = nfsiod_workqueue,
1429                 .flags = RPC_TASK_ASYNC,
1430         };
1431         int status;
1432
1433         kref_get(&data->kref);
1434         data->rpc_done = 0;
1435         data->rpc_status = 0;
1436         data->timestamp = jiffies;
1437         task = rpc_run_task(&task_setup_data);
1438         if (IS_ERR(task))
1439                 return PTR_ERR(task);
1440         status = nfs4_wait_for_completion_rpc_task(task);
1441         if (status != 0) {
1442                 data->cancelled = 1;
1443                 smp_wmb();
1444         } else
1445                 status = data->rpc_status;
1446         rpc_put_task(task);
1447         return status;
1448 }
1449
1450 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1451 {
1452         struct nfs4_opendata *data = calldata;
1453         struct nfs4_state_owner *sp = data->owner;
1454
1455         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1456                 return;
1457         /*
1458          * Check if we still need to send an OPEN call, or if we can use
1459          * a delegation instead.
1460          */
1461         if (data->state != NULL) {
1462                 struct nfs_delegation *delegation;
1463
1464                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1465                         goto out_no_action;
1466                 rcu_read_lock();
1467                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1468                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1469                     can_open_delegated(delegation, data->o_arg.fmode))
1470                         goto unlock_no_action;
1471                 rcu_read_unlock();
1472         }
1473         /* Update client id. */
1474         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1475         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1476                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1477                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1478                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1479         }
1480         data->timestamp = jiffies;
1481         if (nfs4_setup_sequence(data->o_arg.server,
1482                                 &data->o_arg.seq_args,
1483                                 &data->o_res.seq_res,
1484                                 task) != 0)
1485                 nfs_release_seqid(data->o_arg.seqid);
1486         return;
1487 unlock_no_action:
1488         rcu_read_unlock();
1489 out_no_action:
1490         task->tk_action = NULL;
1491
1492 }
1493
1494 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1495 {
1496         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1497         nfs4_open_prepare(task, calldata);
1498 }
1499
1500 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1501 {
1502         struct nfs4_opendata *data = calldata;
1503
1504         data->rpc_status = task->tk_status;
1505
1506         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1507                 return;
1508
1509         if (task->tk_status == 0) {
1510                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1511                         switch (data->o_res.f_attr->mode & S_IFMT) {
1512                         case S_IFREG:
1513                                 break;
1514                         case S_IFLNK:
1515                                 data->rpc_status = -ELOOP;
1516                                 break;
1517                         case S_IFDIR:
1518                                 data->rpc_status = -EISDIR;
1519                                 break;
1520                         default:
1521                                 data->rpc_status = -ENOTDIR;
1522                         }
1523                 }
1524                 renew_lease(data->o_res.server, data->timestamp);
1525                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1526                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1527         }
1528         data->rpc_done = 1;
1529 }
1530
1531 static void nfs4_open_release(void *calldata)
1532 {
1533         struct nfs4_opendata *data = calldata;
1534         struct nfs4_state *state = NULL;
1535
1536         /* If this request hasn't been cancelled, do nothing */
1537         if (data->cancelled == 0)
1538                 goto out_free;
1539         /* In case of error, no cleanup! */
1540         if (data->rpc_status != 0 || !data->rpc_done)
1541                 goto out_free;
1542         /* In case we need an open_confirm, no cleanup! */
1543         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1544                 goto out_free;
1545         state = nfs4_opendata_to_nfs4_state(data);
1546         if (!IS_ERR(state))
1547                 nfs4_close_state(state, data->o_arg.fmode);
1548 out_free:
1549         nfs4_opendata_put(data);
1550 }
1551
1552 static const struct rpc_call_ops nfs4_open_ops = {
1553         .rpc_call_prepare = nfs4_open_prepare,
1554         .rpc_call_done = nfs4_open_done,
1555         .rpc_release = nfs4_open_release,
1556 };
1557
1558 static const struct rpc_call_ops nfs4_recover_open_ops = {
1559         .rpc_call_prepare = nfs4_recover_open_prepare,
1560         .rpc_call_done = nfs4_open_done,
1561         .rpc_release = nfs4_open_release,
1562 };
1563
1564 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1565 {
1566         struct inode *dir = data->dir->d_inode;
1567         struct nfs_server *server = NFS_SERVER(dir);
1568         struct nfs_openargs *o_arg = &data->o_arg;
1569         struct nfs_openres *o_res = &data->o_res;
1570         struct rpc_task *task;
1571         struct rpc_message msg = {
1572                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1573                 .rpc_argp = o_arg,
1574                 .rpc_resp = o_res,
1575                 .rpc_cred = data->owner->so_cred,
1576         };
1577         struct rpc_task_setup task_setup_data = {
1578                 .rpc_client = server->client,
1579                 .rpc_message = &msg,
1580                 .callback_ops = &nfs4_open_ops,
1581                 .callback_data = data,
1582                 .workqueue = nfsiod_workqueue,
1583                 .flags = RPC_TASK_ASYNC,
1584         };
1585         int status;
1586
1587         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1588         kref_get(&data->kref);
1589         data->rpc_done = 0;
1590         data->rpc_status = 0;
1591         data->cancelled = 0;
1592         if (isrecover)
1593                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1594         task = rpc_run_task(&task_setup_data);
1595         if (IS_ERR(task))
1596                 return PTR_ERR(task);
1597         status = nfs4_wait_for_completion_rpc_task(task);
1598         if (status != 0) {
1599                 data->cancelled = 1;
1600                 smp_wmb();
1601         } else
1602                 status = data->rpc_status;
1603         rpc_put_task(task);
1604
1605         return status;
1606 }
1607
1608 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1609 {
1610         struct inode *dir = data->dir->d_inode;
1611         struct nfs_openres *o_res = &data->o_res;
1612         int status;
1613
1614         status = nfs4_run_open_task(data, 1);
1615         if (status != 0 || !data->rpc_done)
1616                 return status;
1617
1618         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1619
1620         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1621                 status = _nfs4_proc_open_confirm(data);
1622                 if (status != 0)
1623                         return status;
1624         }
1625
1626         return status;
1627 }
1628
1629 static int nfs4_opendata_access(struct rpc_cred *cred,
1630                                 struct nfs4_opendata *opendata,
1631                                 struct nfs4_state *state, fmode_t fmode)
1632 {
1633         struct nfs_access_entry cache;
1634         u32 mask;
1635
1636         /* access call failed or for some reason the server doesn't
1637          * support any access modes -- defer access call until later */
1638         if (opendata->o_res.access_supported == 0)
1639                 return 0;
1640
1641         mask = 0;
1642         /* don't check MAY_WRITE - a newly created file may not have
1643          * write mode bits, but POSIX allows the creating process to write */
1644         if (fmode & FMODE_READ)
1645                 mask |= MAY_READ;
1646         if (fmode & FMODE_EXEC)
1647                 mask |= MAY_EXEC;
1648
1649         cache.cred = cred;
1650         cache.jiffies = jiffies;
1651         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1652         nfs_access_add_cache(state->inode, &cache);
1653
1654         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1655                 return 0;
1656
1657         /* even though OPEN succeeded, access is denied. Close the file */
1658         nfs4_close_state(state, fmode);
1659         return -EACCES;
1660 }
1661
1662 /*
1663  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1664  */
1665 static int _nfs4_proc_open(struct nfs4_opendata *data)
1666 {
1667         struct inode *dir = data->dir->d_inode;
1668         struct nfs_server *server = NFS_SERVER(dir);
1669         struct nfs_openargs *o_arg = &data->o_arg;
1670         struct nfs_openres *o_res = &data->o_res;
1671         int status;
1672
1673         status = nfs4_run_open_task(data, 0);
1674         if (!data->rpc_done)
1675                 return status;
1676         if (status != 0) {
1677                 if (status == -NFS4ERR_BADNAME &&
1678                                 !(o_arg->open_flags & O_CREAT))
1679                         return -ENOENT;
1680                 return status;
1681         }
1682
1683         nfs_fattr_map_and_free_names(server, &data->f_attr);
1684
1685         if (o_arg->open_flags & O_CREAT)
1686                 update_changeattr(dir, &o_res->cinfo);
1687         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1688                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1689         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1690                 status = _nfs4_proc_open_confirm(data);
1691                 if (status != 0)
1692                         return status;
1693         }
1694         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1695                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1696         return 0;
1697 }
1698
1699 static int nfs4_recover_expired_lease(struct nfs_server *server)
1700 {
1701         return nfs4_client_recover_expired_lease(server->nfs_client);
1702 }
1703
1704 /*
1705  * OPEN_EXPIRED:
1706  *      reclaim state on the server after a network partition.
1707  *      Assumes caller holds the appropriate lock
1708  */
1709 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1710 {
1711         struct nfs4_opendata *opendata;
1712         int ret;
1713
1714         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1715         if (IS_ERR(opendata))
1716                 return PTR_ERR(opendata);
1717         ret = nfs4_open_recover(opendata, state);
1718         if (ret == -ESTALE)
1719                 d_drop(ctx->dentry);
1720         nfs4_opendata_put(opendata);
1721         return ret;
1722 }
1723
1724 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1725 {
1726         struct nfs_server *server = NFS_SERVER(state->inode);
1727         struct nfs4_exception exception = { };
1728         int err;
1729
1730         do {
1731                 err = _nfs4_open_expired(ctx, state);
1732                 switch (err) {
1733                 default:
1734                         goto out;
1735                 case -NFS4ERR_GRACE:
1736                 case -NFS4ERR_DELAY:
1737                         nfs4_handle_exception(server, err, &exception);
1738                         err = 0;
1739                 }
1740         } while (exception.retry);
1741 out:
1742         return err;
1743 }
1744
1745 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1746 {
1747         struct nfs_open_context *ctx;
1748         int ret;
1749
1750         ctx = nfs4_state_find_open_context(state);
1751         if (IS_ERR(ctx))
1752                 return PTR_ERR(ctx);
1753         ret = nfs4_do_open_expired(ctx, state);
1754         put_nfs_open_context(ctx);
1755         return ret;
1756 }
1757
1758 #if defined(CONFIG_NFS_V4_1)
1759 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1760 {
1761         struct nfs_server *server = NFS_SERVER(state->inode);
1762         nfs4_stateid *stateid = &state->stateid;
1763         int status;
1764
1765         /* If a state reset has been done, test_stateid is unneeded */
1766         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1767                 return;
1768
1769         status = nfs41_test_stateid(server, stateid);
1770         if (status != NFS_OK) {
1771                 /* Free the stateid unless the server explicitly
1772                  * informs us the stateid is unrecognized. */
1773                 if (status != -NFS4ERR_BAD_STATEID)
1774                         nfs41_free_stateid(server, stateid);
1775                 nfs_remove_bad_delegation(state->inode);
1776
1777                 write_seqlock(&state->seqlock);
1778                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1779                 write_sequnlock(&state->seqlock);
1780                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1781         }
1782 }
1783
1784 /**
1785  * nfs41_check_open_stateid - possibly free an open stateid
1786  *
1787  * @state: NFSv4 state for an inode
1788  *
1789  * Returns NFS_OK if recovery for this stateid is now finished.
1790  * Otherwise a negative NFS4ERR value is returned.
1791  */
1792 static int nfs41_check_open_stateid(struct nfs4_state *state)
1793 {
1794         struct nfs_server *server = NFS_SERVER(state->inode);
1795         nfs4_stateid *stateid = &state->open_stateid;
1796         int status;
1797
1798         /* If a state reset has been done, test_stateid is unneeded */
1799         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1800             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1801             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1802                 return -NFS4ERR_BAD_STATEID;
1803
1804         status = nfs41_test_stateid(server, stateid);
1805         if (status != NFS_OK) {
1806                 /* Free the stateid unless the server explicitly
1807                  * informs us the stateid is unrecognized. */
1808                 if (status != -NFS4ERR_BAD_STATEID)
1809                         nfs41_free_stateid(server, stateid);
1810
1811                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1812                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1813                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1814         }
1815         return status;
1816 }
1817
1818 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1819 {
1820         int status;
1821
1822         nfs41_clear_delegation_stateid(state);
1823         status = nfs41_check_open_stateid(state);
1824         if (status != NFS_OK)
1825                 status = nfs4_open_expired(sp, state);
1826         return status;
1827 }
1828 #endif
1829
1830 /*
1831  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1832  * fields corresponding to attributes that were used to store the verifier.
1833  * Make sure we clobber those fields in the later setattr call
1834  */
1835 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1836 {
1837         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1838             !(sattr->ia_valid & ATTR_ATIME_SET))
1839                 sattr->ia_valid |= ATTR_ATIME;
1840
1841         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1842             !(sattr->ia_valid & ATTR_MTIME_SET))
1843                 sattr->ia_valid |= ATTR_MTIME;
1844 }
1845
1846 /*
1847  * Returns a referenced nfs4_state
1848  */
1849 static int _nfs4_do_open(struct inode *dir,
1850                         struct dentry *dentry,
1851                         fmode_t fmode,
1852                         int flags,
1853                         struct iattr *sattr,
1854                         struct rpc_cred *cred,
1855                         struct nfs4_state **res,
1856                         struct nfs4_threshold **ctx_th)
1857 {
1858         struct nfs4_state_owner  *sp;
1859         struct nfs4_state     *state = NULL;
1860         struct nfs_server       *server = NFS_SERVER(dir);
1861         struct nfs4_opendata *opendata;
1862         int status;
1863
1864         /* Protect against reboot recovery conflicts */
1865         status = -ENOMEM;
1866         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1867         if (sp == NULL) {
1868                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1869                 goto out_err;
1870         }
1871         status = nfs4_recover_expired_lease(server);
1872         if (status != 0)
1873                 goto err_put_state_owner;
1874         if (dentry->d_inode != NULL)
1875                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1876         status = -ENOMEM;
1877         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1878         if (opendata == NULL)
1879                 goto err_put_state_owner;
1880
1881         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1882                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1883                 if (!opendata->f_attr.mdsthreshold)
1884                         goto err_opendata_put;
1885                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1886         }
1887         if (dentry->d_inode != NULL)
1888                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1889
1890         status = _nfs4_proc_open(opendata);
1891         if (status != 0)
1892                 goto err_opendata_put;
1893
1894         state = nfs4_opendata_to_nfs4_state(opendata);
1895         status = PTR_ERR(state);
1896         if (IS_ERR(state))
1897                 goto err_opendata_put;
1898         if (server->caps & NFS_CAP_POSIX_LOCK)
1899                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1900
1901         status = nfs4_opendata_access(cred, opendata, state, fmode);
1902         if (status != 0)
1903                 goto err_opendata_put;
1904
1905         if (opendata->o_arg.open_flags & O_EXCL) {
1906                 nfs4_exclusive_attrset(opendata, sattr);
1907
1908                 nfs_fattr_init(opendata->o_res.f_attr);
1909                 status = nfs4_do_setattr(state->inode, cred,
1910                                 opendata->o_res.f_attr, sattr,
1911                                 state);
1912                 if (status == 0)
1913                         nfs_setattr_update_inode(state->inode, sattr);
1914                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1915         }
1916
1917         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1918                 *ctx_th = opendata->f_attr.mdsthreshold;
1919         else
1920                 kfree(opendata->f_attr.mdsthreshold);
1921         opendata->f_attr.mdsthreshold = NULL;
1922
1923         nfs4_opendata_put(opendata);
1924         nfs4_put_state_owner(sp);
1925         *res = state;
1926         return 0;
1927 err_opendata_put:
1928         kfree(opendata->f_attr.mdsthreshold);
1929         nfs4_opendata_put(opendata);
1930 err_put_state_owner:
1931         nfs4_put_state_owner(sp);
1932 out_err:
1933         *res = NULL;
1934         return status;
1935 }
1936
1937
1938 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1939                                         struct dentry *dentry,
1940                                         fmode_t fmode,
1941                                         int flags,
1942                                         struct iattr *sattr,
1943                                         struct rpc_cred *cred,
1944                                         struct nfs4_threshold **ctx_th)
1945 {
1946         struct nfs4_exception exception = { };
1947         struct nfs4_state *res;
1948         int status;
1949
1950         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1951         do {
1952                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1953                                        &res, ctx_th);
1954                 if (status == 0)
1955                         break;
1956                 /* NOTE: BAD_SEQID means the server and client disagree about the
1957                  * book-keeping w.r.t. state-changing operations
1958                  * (OPEN/CLOSE/LOCK/LOCKU...)
1959                  * It is actually a sign of a bug on the client or on the server.
1960                  *
1961                  * If we receive a BAD_SEQID error in the particular case of
1962                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1963                  * have unhashed the old state_owner for us, and that we can
1964                  * therefore safely retry using a new one. We should still warn
1965                  * the user though...
1966                  */
1967                 if (status == -NFS4ERR_BAD_SEQID) {
1968                         pr_warn_ratelimited("NFS: v4 server %s "
1969                                         " returned a bad sequence-id error!\n",
1970                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1971                         exception.retry = 1;
1972                         continue;
1973                 }
1974                 /*
1975                  * BAD_STATEID on OPEN means that the server cancelled our
1976                  * state before it received the OPEN_CONFIRM.
1977                  * Recover by retrying the request as per the discussion
1978                  * on Page 181 of RFC3530.
1979                  */
1980                 if (status == -NFS4ERR_BAD_STATEID) {
1981                         exception.retry = 1;
1982                         continue;
1983                 }
1984                 if (status == -EAGAIN) {
1985                         /* We must have found a delegation */
1986                         exception.retry = 1;
1987                         continue;
1988                 }
1989                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1990                                         status, &exception));
1991         } while (exception.retry);
1992         return res;
1993 }
1994
1995 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1996                             struct nfs_fattr *fattr, struct iattr *sattr,
1997                             struct nfs4_state *state)
1998 {
1999         struct nfs_server *server = NFS_SERVER(inode);
2000         struct nfs_setattrargs  arg = {
2001                 .fh             = NFS_FH(inode),
2002                 .iap            = sattr,
2003                 .server         = server,
2004                 .bitmask = server->attr_bitmask,
2005         };
2006         struct nfs_setattrres  res = {
2007                 .fattr          = fattr,
2008                 .server         = server,
2009         };
2010         struct rpc_message msg = {
2011                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2012                 .rpc_argp       = &arg,
2013                 .rpc_resp       = &res,
2014                 .rpc_cred       = cred,
2015         };
2016         unsigned long timestamp = jiffies;
2017         int status;
2018
2019         nfs_fattr_init(fattr);
2020
2021         if (state != NULL) {
2022                 struct nfs_lockowner lockowner = {
2023                         .l_owner = current->files,
2024                         .l_pid = current->tgid,
2025                 };
2026                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2027                                 &lockowner);
2028         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2029                                 FMODE_WRITE)) {
2030                 /* Use that stateid */
2031         } else
2032                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2033
2034         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2035         if (status == 0 && state != NULL)
2036                 renew_lease(server, timestamp);
2037         return status;
2038 }
2039
2040 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2041                            struct nfs_fattr *fattr, struct iattr *sattr,
2042                            struct nfs4_state *state)
2043 {
2044         struct nfs_server *server = NFS_SERVER(inode);
2045         struct nfs4_exception exception = {
2046                 .state = state,
2047                 .inode = inode,
2048         };
2049         int err;
2050         do {
2051                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2052                 switch (err) {
2053                 case -NFS4ERR_OPENMODE:
2054                         if (state && !(state->state & FMODE_WRITE)) {
2055                                 err = -EBADF;
2056                                 if (sattr->ia_valid & ATTR_OPEN)
2057                                         err = -EACCES;
2058                                 goto out;
2059                         }
2060                 }
2061                 err = nfs4_handle_exception(server, err, &exception);
2062         } while (exception.retry);
2063 out:
2064         return err;
2065 }
2066
2067 struct nfs4_closedata {
2068         struct inode *inode;
2069         struct nfs4_state *state;
2070         struct nfs_closeargs arg;
2071         struct nfs_closeres res;
2072         struct nfs_fattr fattr;
2073         unsigned long timestamp;
2074         bool roc;
2075         u32 roc_barrier;
2076 };
2077
2078 static void nfs4_free_closedata(void *data)
2079 {
2080         struct nfs4_closedata *calldata = data;
2081         struct nfs4_state_owner *sp = calldata->state->owner;
2082         struct super_block *sb = calldata->state->inode->i_sb;
2083
2084         if (calldata->roc)
2085                 pnfs_roc_release(calldata->state->inode);
2086         nfs4_put_open_state(calldata->state);
2087         nfs_free_seqid(calldata->arg.seqid);
2088         nfs4_put_state_owner(sp);
2089         nfs_sb_deactive_async(sb);
2090         kfree(calldata);
2091 }
2092
2093 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2094                 fmode_t fmode)
2095 {
2096         spin_lock(&state->owner->so_lock);
2097         if (!(fmode & FMODE_READ))
2098                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2099         if (!(fmode & FMODE_WRITE))
2100                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2101         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2102         spin_unlock(&state->owner->so_lock);
2103 }
2104
2105 static void nfs4_close_done(struct rpc_task *task, void *data)
2106 {
2107         struct nfs4_closedata *calldata = data;
2108         struct nfs4_state *state = calldata->state;
2109         struct nfs_server *server = NFS_SERVER(calldata->inode);
2110
2111         dprintk("%s: begin!\n", __func__);
2112         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2113                 return;
2114         /* hmm. we are done with the inode, and in the process of freeing
2115          * the state_owner. we keep this around to process errors
2116          */
2117         switch (task->tk_status) {
2118                 case 0:
2119                         if (calldata->roc)
2120                                 pnfs_roc_set_barrier(state->inode,
2121                                                      calldata->roc_barrier);
2122                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2123                         renew_lease(server, calldata->timestamp);
2124                         nfs4_close_clear_stateid_flags(state,
2125                                         calldata->arg.fmode);
2126                         break;
2127                 case -NFS4ERR_STALE_STATEID:
2128                 case -NFS4ERR_OLD_STATEID:
2129                 case -NFS4ERR_BAD_STATEID:
2130                 case -NFS4ERR_EXPIRED:
2131                         if (calldata->arg.fmode == 0)
2132                                 break;
2133                 default:
2134                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2135                                 rpc_restart_call_prepare(task);
2136         }
2137         nfs_release_seqid(calldata->arg.seqid);
2138         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2139         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2140 }
2141
2142 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2143 {
2144         struct nfs4_closedata *calldata = data;
2145         struct nfs4_state *state = calldata->state;
2146         struct inode *inode = calldata->inode;
2147         int call_close = 0;
2148
2149         dprintk("%s: begin!\n", __func__);
2150         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2151                 return;
2152
2153         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2154         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2155         spin_lock(&state->owner->so_lock);
2156         /* Calculate the change in open mode */
2157         if (state->n_rdwr == 0) {
2158                 if (state->n_rdonly == 0) {
2159                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2160                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2161                         calldata->arg.fmode &= ~FMODE_READ;
2162                 }
2163                 if (state->n_wronly == 0) {
2164                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2165                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2166                         calldata->arg.fmode &= ~FMODE_WRITE;
2167                 }
2168         }
2169         spin_unlock(&state->owner->so_lock);
2170
2171         if (!call_close) {
2172                 /* Note: exit _without_ calling nfs4_close_done */
2173                 task->tk_action = NULL;
2174                 goto out;
2175         }
2176
2177         if (calldata->arg.fmode == 0) {
2178                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2179                 if (calldata->roc &&
2180                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2181                         goto out;
2182         }
2183
2184         nfs_fattr_init(calldata->res.fattr);
2185         calldata->timestamp = jiffies;
2186         if (nfs4_setup_sequence(NFS_SERVER(inode),
2187                                 &calldata->arg.seq_args,
2188                                 &calldata->res.seq_res,
2189                                 task) != 0)
2190                 nfs_release_seqid(calldata->arg.seqid);
2191 out:
2192         dprintk("%s: done!\n", __func__);
2193 }
2194
2195 static const struct rpc_call_ops nfs4_close_ops = {
2196         .rpc_call_prepare = nfs4_close_prepare,
2197         .rpc_call_done = nfs4_close_done,
2198         .rpc_release = nfs4_free_closedata,
2199 };
2200
2201 /*
2202  * It is possible for data to be read/written from a mem-mapped file
2203  * after the sys_close call (which hits the vfs layer as a flush).
2204  * This means that we can't safely call nfsv4 close on a file until
2205  * the inode is cleared. This in turn means that we are not good
2206  * NFSv4 citizens - we do not indicate to the server to update the file's
2207  * share state even when we are done with one of the three share
2208  * stateid's in the inode.
2209  *
2210  * NOTE: Caller must be holding the sp->so_owner semaphore!
2211  */
2212 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2213 {
2214         struct nfs_server *server = NFS_SERVER(state->inode);
2215         struct nfs4_closedata *calldata;
2216         struct nfs4_state_owner *sp = state->owner;
2217         struct rpc_task *task;
2218         struct rpc_message msg = {
2219                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2220                 .rpc_cred = state->owner->so_cred,
2221         };
2222         struct rpc_task_setup task_setup_data = {
2223                 .rpc_client = server->client,
2224                 .rpc_message = &msg,
2225                 .callback_ops = &nfs4_close_ops,
2226                 .workqueue = nfsiod_workqueue,
2227                 .flags = RPC_TASK_ASYNC,
2228         };
2229         int status = -ENOMEM;
2230
2231         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2232         if (calldata == NULL)
2233                 goto out;
2234         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2235         calldata->inode = state->inode;
2236         calldata->state = state;
2237         calldata->arg.fh = NFS_FH(state->inode);
2238         calldata->arg.stateid = &state->open_stateid;
2239         /* Serialization for the sequence id */
2240         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2241         if (calldata->arg.seqid == NULL)
2242                 goto out_free_calldata;
2243         calldata->arg.fmode = 0;
2244         calldata->arg.bitmask = server->cache_consistency_bitmask;
2245         calldata->res.fattr = &calldata->fattr;
2246         calldata->res.seqid = calldata->arg.seqid;
2247         calldata->res.server = server;
2248         calldata->roc = pnfs_roc(state->inode);
2249         nfs_sb_active(calldata->inode->i_sb);
2250
2251         msg.rpc_argp = &calldata->arg;
2252         msg.rpc_resp = &calldata->res;
2253         task_setup_data.callback_data = calldata;
2254         task = rpc_run_task(&task_setup_data);
2255         if (IS_ERR(task))
2256                 return PTR_ERR(task);
2257         status = 0;
2258         if (wait)
2259                 status = rpc_wait_for_completion_task(task);
2260         rpc_put_task(task);
2261         return status;
2262 out_free_calldata:
2263         kfree(calldata);
2264 out:
2265         nfs4_put_open_state(state);
2266         nfs4_put_state_owner(sp);
2267         return status;
2268 }
2269
2270 static struct inode *
2271 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2272 {
2273         struct nfs4_state *state;
2274
2275         /* Protect against concurrent sillydeletes */
2276         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2277                              ctx->cred, &ctx->mdsthreshold);
2278         if (IS_ERR(state))
2279                 return ERR_CAST(state);
2280         ctx->state = state;
2281         return igrab(state->inode);
2282 }
2283
2284 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2285 {
2286         if (ctx->state == NULL)
2287                 return;
2288         if (is_sync)
2289                 nfs4_close_sync(ctx->state, ctx->mode);
2290         else
2291                 nfs4_close_state(ctx->state, ctx->mode);
2292 }
2293
2294 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2295 {
2296         struct nfs4_server_caps_arg args = {
2297                 .fhandle = fhandle,
2298         };
2299         struct nfs4_server_caps_res res = {};
2300         struct rpc_message msg = {
2301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2302                 .rpc_argp = &args,
2303                 .rpc_resp = &res,
2304         };
2305         int status;
2306
2307         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2308         if (status == 0) {
2309                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2310                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2311                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2312                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2313                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2314                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2315                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2316                         server->caps |= NFS_CAP_ACLS;
2317                 if (res.has_links != 0)
2318                         server->caps |= NFS_CAP_HARDLINKS;
2319                 if (res.has_symlinks != 0)
2320                         server->caps |= NFS_CAP_SYMLINKS;
2321                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2322                         server->caps |= NFS_CAP_FILEID;
2323                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2324                         server->caps |= NFS_CAP_MODE;
2325                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2326                         server->caps |= NFS_CAP_NLINK;
2327                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2328                         server->caps |= NFS_CAP_OWNER;
2329                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2330                         server->caps |= NFS_CAP_OWNER_GROUP;
2331                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2332                         server->caps |= NFS_CAP_ATIME;
2333                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2334                         server->caps |= NFS_CAP_CTIME;
2335                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2336                         server->caps |= NFS_CAP_MTIME;
2337
2338                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2339                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2340                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2341                 server->acl_bitmask = res.acl_bitmask;
2342                 server->fh_expire_type = res.fh_expire_type;
2343         }
2344
2345         return status;
2346 }
2347
2348 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2349 {
2350         struct nfs4_exception exception = { };
2351         int err;
2352         do {
2353                 err = nfs4_handle_exception(server,
2354                                 _nfs4_server_capabilities(server, fhandle),
2355                                 &exception);
2356         } while (exception.retry);
2357         return err;
2358 }
2359
2360 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2361                 struct nfs_fsinfo *info)
2362 {
2363         struct nfs4_lookup_root_arg args = {
2364                 .bitmask = nfs4_fattr_bitmap,
2365         };
2366         struct nfs4_lookup_res res = {
2367                 .server = server,
2368                 .fattr = info->fattr,
2369                 .fh = fhandle,
2370         };
2371         struct rpc_message msg = {
2372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2373                 .rpc_argp = &args,
2374                 .rpc_resp = &res,
2375         };
2376
2377         nfs_fattr_init(info->fattr);
2378         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2379 }
2380
2381 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2382                 struct nfs_fsinfo *info)
2383 {
2384         struct nfs4_exception exception = { };
2385         int err;
2386         do {
2387                 err = _nfs4_lookup_root(server, fhandle, info);
2388                 switch (err) {
2389                 case 0:
2390                 case -NFS4ERR_WRONGSEC:
2391                         goto out;
2392                 default:
2393                         err = nfs4_handle_exception(server, err, &exception);
2394                 }
2395         } while (exception.retry);
2396 out:
2397         return err;
2398 }
2399
2400 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2401                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2402 {
2403         struct rpc_auth *auth;
2404         int ret;
2405
2406         auth = rpcauth_create(flavor, server->client);
2407         if (IS_ERR(auth)) {
2408                 ret = -EIO;
2409                 goto out;
2410         }
2411         ret = nfs4_lookup_root(server, fhandle, info);
2412 out:
2413         return ret;
2414 }
2415
2416 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2417                               struct nfs_fsinfo *info)
2418 {
2419         int i, len, status = 0;
2420         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2421
2422         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2423         if (len < 0)
2424                 return len;
2425
2426         for (i = 0; i < len; i++) {
2427                 /* AUTH_UNIX is the default flavor if none was specified,
2428                  * thus has already been tried. */
2429                 if (flav_array[i] == RPC_AUTH_UNIX)
2430                         continue;
2431
2432                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2433                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2434                         continue;
2435                 break;
2436         }
2437         /*
2438          * -EACCESS could mean that the user doesn't have correct permissions
2439          * to access the mount.  It could also mean that we tried to mount
2440          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2441          * existing mount programs don't handle -EACCES very well so it should
2442          * be mapped to -EPERM instead.
2443          */
2444         if (status == -EACCES)
2445                 status = -EPERM;
2446         return status;
2447 }
2448
2449 /*
2450  * get the file handle for the "/" directory on the server
2451  */
2452 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2453                          struct nfs_fsinfo *info)
2454 {
2455         int minor_version = server->nfs_client->cl_minorversion;
2456         int status = nfs4_lookup_root(server, fhandle, info);
2457         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2458                 /*
2459                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2460                  * by nfs4_map_errors() as this function exits.
2461                  */
2462                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2463         if (status == 0)
2464                 status = nfs4_server_capabilities(server, fhandle);
2465         if (status == 0)
2466                 status = nfs4_do_fsinfo(server, fhandle, info);
2467         return nfs4_map_errors(status);
2468 }
2469
2470 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2471                               struct nfs_fsinfo *info)
2472 {
2473         int error;
2474         struct nfs_fattr *fattr = info->fattr;
2475
2476         error = nfs4_server_capabilities(server, mntfh);
2477         if (error < 0) {
2478                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2479                 return error;
2480         }
2481
2482         error = nfs4_proc_getattr(server, mntfh, fattr);
2483         if (error < 0) {
2484                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2485                 return error;
2486         }
2487
2488         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2489             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2490                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2491
2492         return error;
2493 }
2494
2495 /*
2496  * Get locations and (maybe) other attributes of a referral.
2497  * Note that we'll actually follow the referral later when
2498  * we detect fsid mismatch in inode revalidation
2499  */
2500 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2501                              const struct qstr *name, struct nfs_fattr *fattr,
2502                              struct nfs_fh *fhandle)
2503 {
2504         int status = -ENOMEM;
2505         struct page *page = NULL;
2506         struct nfs4_fs_locations *locations = NULL;
2507
2508         page = alloc_page(GFP_KERNEL);
2509         if (page == NULL)
2510                 goto out;
2511         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2512         if (locations == NULL)
2513                 goto out;
2514
2515         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2516         if (status != 0)
2517                 goto out;
2518         /* Make sure server returned a different fsid for the referral */
2519         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2520                 dprintk("%s: server did not return a different fsid for"
2521                         " a referral at %s\n", __func__, name->name);
2522                 status = -EIO;
2523                 goto out;
2524         }
2525         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2526         nfs_fixup_referral_attributes(&locations->fattr);
2527
2528         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2529         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2530         memset(fhandle, 0, sizeof(struct nfs_fh));
2531 out:
2532         if (page)
2533                 __free_page(page);
2534         kfree(locations);
2535         return status;
2536 }
2537
2538 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2539 {
2540         struct nfs4_getattr_arg args = {
2541                 .fh = fhandle,
2542                 .bitmask = server->attr_bitmask,
2543         };
2544         struct nfs4_getattr_res res = {
2545                 .fattr = fattr,
2546                 .server = server,
2547         };
2548         struct rpc_message msg = {
2549                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2550                 .rpc_argp = &args,
2551                 .rpc_resp = &res,
2552         };
2553
2554         nfs_fattr_init(fattr);
2555         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2556 }
2557
2558 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2559 {
2560         struct nfs4_exception exception = { };
2561         int err;
2562         do {
2563                 err = nfs4_handle_exception(server,
2564                                 _nfs4_proc_getattr(server, fhandle, fattr),
2565                                 &exception);
2566         } while (exception.retry);
2567         return err;
2568 }
2569
2570 /*
2571  * The file is not closed if it is opened due to the a request to change
2572  * the size of the file. The open call will not be needed once the
2573  * VFS layer lookup-intents are implemented.
2574  *
2575  * Close is called when the inode is destroyed.
2576  * If we haven't opened the file for O_WRONLY, we
2577  * need to in the size_change case to obtain a stateid.
2578  *
2579  * Got race?
2580  * Because OPEN is always done by name in nfsv4, it is
2581  * possible that we opened a different file by the same
2582  * name.  We can recognize this race condition, but we
2583  * can't do anything about it besides returning an error.
2584  *
2585  * This will be fixed with VFS changes (lookup-intent).
2586  */
2587 static int
2588 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2589                   struct iattr *sattr)
2590 {
2591         struct inode *inode = dentry->d_inode;
2592         struct rpc_cred *cred = NULL;
2593         struct nfs4_state *state = NULL;
2594         int status;
2595
2596         if (pnfs_ld_layoutret_on_setattr(inode))
2597                 pnfs_return_layout(inode);
2598
2599         nfs_fattr_init(fattr);
2600
2601         /* Deal with open(O_TRUNC) */
2602         if (sattr->ia_valid & ATTR_OPEN)
2603                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2604
2605         /* Optimization: if the end result is no change, don't RPC */
2606         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2607                 return 0;
2608
2609         /* Search for an existing open(O_WRITE) file */
2610         if (sattr->ia_valid & ATTR_FILE) {
2611                 struct nfs_open_context *ctx;
2612
2613                 ctx = nfs_file_open_context(sattr->ia_file);
2614                 if (ctx) {
2615                         cred = ctx->cred;
2616                         state = ctx->state;
2617                 }
2618         }
2619
2620         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2621         if (status == 0)
2622                 nfs_setattr_update_inode(inode, sattr);
2623         return status;
2624 }
2625
2626 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2627                 const struct qstr *name, struct nfs_fh *fhandle,
2628                 struct nfs_fattr *fattr)
2629 {
2630         struct nfs_server *server = NFS_SERVER(dir);
2631         int                    status;
2632         struct nfs4_lookup_arg args = {
2633                 .bitmask = server->attr_bitmask,
2634                 .dir_fh = NFS_FH(dir),
2635                 .name = name,
2636         };
2637         struct nfs4_lookup_res res = {
2638                 .server = server,
2639                 .fattr = fattr,
2640                 .fh = fhandle,
2641         };
2642         struct rpc_message msg = {
2643                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2644                 .rpc_argp = &args,
2645                 .rpc_resp = &res,
2646         };
2647
2648         nfs_fattr_init(fattr);
2649
2650         dprintk("NFS call  lookup %s\n", name->name);
2651         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2652         dprintk("NFS reply lookup: %d\n", status);
2653         return status;
2654 }
2655
2656 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2657 {
2658         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2659                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2660         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2661         fattr->nlink = 2;
2662 }
2663
2664 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2665                                    struct qstr *name, struct nfs_fh *fhandle,
2666                                    struct nfs_fattr *fattr)
2667 {
2668         struct nfs4_exception exception = { };
2669         struct rpc_clnt *client = *clnt;
2670         int err;
2671         do {
2672                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2673                 switch (err) {
2674                 case -NFS4ERR_BADNAME:
2675                         err = -ENOENT;
2676                         goto out;
2677                 case -NFS4ERR_MOVED:
2678                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2679                         goto out;
2680                 case -NFS4ERR_WRONGSEC:
2681                         err = -EPERM;
2682                         if (client != *clnt)
2683                                 goto out;
2684
2685                         client = nfs4_create_sec_client(client, dir, name);
2686                         if (IS_ERR(client))
2687                                 return PTR_ERR(client);
2688
2689                         exception.retry = 1;
2690                         break;
2691                 default:
2692                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2693                 }
2694         } while (exception.retry);
2695
2696 out:
2697         if (err == 0)
2698                 *clnt = client;
2699         else if (client != *clnt)
2700                 rpc_shutdown_client(client);
2701
2702         return err;
2703 }
2704
2705 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2706                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2707 {
2708         int status;
2709         struct rpc_clnt *client = NFS_CLIENT(dir);
2710
2711         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2712         if (client != NFS_CLIENT(dir)) {
2713                 rpc_shutdown_client(client);
2714                 nfs_fixup_secinfo_attributes(fattr);
2715         }
2716         return status;
2717 }
2718
2719 struct rpc_clnt *
2720 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2721                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2722 {
2723         int status;
2724         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2725
2726         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2727         if (status < 0) {
2728                 rpc_shutdown_client(client);
2729                 return ERR_PTR(status);
2730         }
2731         return client;
2732 }
2733
2734 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2735 {
2736         struct nfs_server *server = NFS_SERVER(inode);
2737         struct nfs4_accessargs args = {
2738                 .fh = NFS_FH(inode),
2739                 .bitmask = server->cache_consistency_bitmask,
2740         };
2741         struct nfs4_accessres res = {
2742                 .server = server,
2743         };
2744         struct rpc_message msg = {
2745                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2746                 .rpc_argp = &args,
2747                 .rpc_resp = &res,
2748                 .rpc_cred = entry->cred,
2749         };
2750         int mode = entry->mask;
2751         int status;
2752
2753         /*
2754          * Determine which access bits we want to ask for...
2755          */
2756         if (mode & MAY_READ)
2757                 args.access |= NFS4_ACCESS_READ;
2758         if (S_ISDIR(inode->i_mode)) {
2759                 if (mode & MAY_WRITE)
2760                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2761                 if (mode & MAY_EXEC)
2762                         args.access |= NFS4_ACCESS_LOOKUP;
2763         } else {
2764                 if (mode & MAY_WRITE)
2765                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2766                 if (mode & MAY_EXEC)
2767                         args.access |= NFS4_ACCESS_EXECUTE;
2768         }
2769
2770         res.fattr = nfs_alloc_fattr();
2771         if (res.fattr == NULL)
2772                 return -ENOMEM;
2773
2774         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2775         if (!status) {
2776                 nfs_access_set_mask(entry, res.access);
2777                 nfs_refresh_inode(inode, res.fattr);
2778         }
2779         nfs_free_fattr(res.fattr);
2780         return status;
2781 }
2782
2783 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2784 {
2785         struct nfs4_exception exception = { };
2786         int err;
2787         do {
2788                 err = nfs4_handle_exception(NFS_SERVER(inode),
2789                                 _nfs4_proc_access(inode, entry),
2790                                 &exception);
2791         } while (exception.retry);
2792         return err;
2793 }
2794
2795 /*
2796  * TODO: For the time being, we don't try to get any attributes
2797  * along with any of the zero-copy operations READ, READDIR,
2798  * READLINK, WRITE.
2799  *
2800  * In the case of the first three, we want to put the GETATTR
2801  * after the read-type operation -- this is because it is hard
2802  * to predict the length of a GETATTR response in v4, and thus
2803  * align the READ data correctly.  This means that the GETATTR
2804  * may end up partially falling into the page cache, and we should
2805  * shift it into the 'tail' of the xdr_buf before processing.
2806  * To do this efficiently, we need to know the total length
2807  * of data received, which doesn't seem to be available outside
2808  * of the RPC layer.
2809  *
2810  * In the case of WRITE, we also want to put the GETATTR after
2811  * the operation -- in this case because we want to make sure
2812  * we get the post-operation mtime and size.
2813  *
2814  * Both of these changes to the XDR layer would in fact be quite
2815  * minor, but I decided to leave them for a subsequent patch.
2816  */
2817 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2818                 unsigned int pgbase, unsigned int pglen)
2819 {
2820         struct nfs4_readlink args = {
2821                 .fh       = NFS_FH(inode),
2822                 .pgbase   = pgbase,
2823                 .pglen    = pglen,
2824                 .pages    = &page,
2825         };
2826         struct nfs4_readlink_res res;
2827         struct rpc_message msg = {
2828                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2829                 .rpc_argp = &args,
2830                 .rpc_resp = &res,
2831         };
2832
2833         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2834 }
2835
2836 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2837                 unsigned int pgbase, unsigned int pglen)
2838 {
2839         struct nfs4_exception exception = { };
2840         int err;
2841         do {
2842                 err = nfs4_handle_exception(NFS_SERVER(inode),
2843                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2844                                 &exception);
2845         } while (exception.retry);
2846         return err;
2847 }
2848
2849 /*
2850  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2851  */
2852 static int
2853 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2854                  int flags)
2855 {
2856         struct nfs_open_context *ctx;
2857         struct nfs4_state *state;
2858         int status = 0;
2859
2860         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2861         if (IS_ERR(ctx))
2862                 return PTR_ERR(ctx);
2863
2864         sattr->ia_mode &= ~current_umask();
2865         state = nfs4_do_open(dir, dentry, ctx->mode,
2866                         flags, sattr, ctx->cred,
2867                         &ctx->mdsthreshold);
2868         d_drop(dentry);
2869         if (IS_ERR(state)) {
2870                 status = PTR_ERR(state);
2871                 goto out;
2872         }
2873         d_add(dentry, igrab(state->inode));
2874         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2875         ctx->state = state;
2876 out:
2877         put_nfs_open_context(ctx);
2878         return status;
2879 }
2880
2881 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2882 {
2883         struct nfs_server *server = NFS_SERVER(dir);
2884         struct nfs_removeargs args = {
2885                 .fh = NFS_FH(dir),
2886                 .name = *name,
2887         };
2888         struct nfs_removeres res = {
2889                 .server = server,
2890         };
2891         struct rpc_message msg = {
2892                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2893                 .rpc_argp = &args,
2894                 .rpc_resp = &res,
2895         };
2896         int status;
2897
2898         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2899         if (status == 0)
2900                 update_changeattr(dir, &res.cinfo);
2901         return status;
2902 }
2903
2904 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2905 {
2906         struct nfs4_exception exception = { };
2907         int err;
2908         do {
2909                 err = nfs4_handle_exception(NFS_SERVER(dir),
2910                                 _nfs4_proc_remove(dir, name),
2911                                 &exception);
2912         } while (exception.retry);
2913         return err;
2914 }
2915
2916 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2917 {
2918         struct nfs_server *server = NFS_SERVER(dir);
2919         struct nfs_removeargs *args = msg->rpc_argp;
2920         struct nfs_removeres *res = msg->rpc_resp;
2921
2922         res->server = server;
2923         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2924         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2925 }
2926
2927 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2928 {
2929         nfs4_setup_sequence(NFS_SERVER(data->dir),
2930                         &data->args.seq_args,
2931                         &data->res.seq_res,
2932                         task);
2933 }
2934
2935 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2936 {
2937         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2938
2939         if (!nfs4_sequence_done(task, &res->seq_res))
2940                 return 0;
2941         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2942                 return 0;
2943         update_changeattr(dir, &res->cinfo);
2944         return 1;
2945 }
2946
2947 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2948 {
2949         struct nfs_server *server = NFS_SERVER(dir);
2950         struct nfs_renameargs *arg = msg->rpc_argp;
2951         struct nfs_renameres *res = msg->rpc_resp;
2952
2953         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2954         res->server = server;
2955         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2956 }
2957
2958 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2959 {
2960         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2961                         &data->args.seq_args,
2962                         &data->res.seq_res,
2963                         task);
2964 }
2965
2966 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2967                                  struct inode *new_dir)
2968 {
2969         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2970
2971         if (!nfs4_sequence_done(task, &res->seq_res))
2972                 return 0;
2973         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2974                 return 0;
2975
2976         update_changeattr(old_dir, &res->old_cinfo);
2977         update_changeattr(new_dir, &res->new_cinfo);
2978         return 1;
2979 }
2980
2981 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2982                 struct inode *new_dir, struct qstr *new_name)
2983 {
2984         struct nfs_server *server = NFS_SERVER(old_dir);
2985         struct nfs_renameargs arg = {
2986                 .old_dir = NFS_FH(old_dir),
2987                 .new_dir = NFS_FH(new_dir),
2988                 .old_name = old_name,
2989                 .new_name = new_name,
2990         };
2991         struct nfs_renameres res = {
2992                 .server = server,
2993         };
2994         struct rpc_message msg = {
2995                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2996                 .rpc_argp = &arg,
2997                 .rpc_resp = &res,
2998         };
2999         int status = -ENOMEM;
3000
3001         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3002         if (!status) {
3003                 update_changeattr(old_dir, &res.old_cinfo);
3004                 update_changeattr(new_dir, &res.new_cinfo);
3005         }
3006         return status;
3007 }
3008
3009 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3010                 struct inode *new_dir, struct qstr *new_name)
3011 {
3012         struct nfs4_exception exception = { };
3013         int err;
3014         do {
3015                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3016                                 _nfs4_proc_rename(old_dir, old_name,
3017                                         new_dir, new_name),
3018                                 &exception);
3019         } while (exception.retry);
3020         return err;
3021 }
3022
3023 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3024 {
3025         struct nfs_server *server = NFS_SERVER(inode);
3026         struct nfs4_link_arg arg = {
3027                 .fh     = NFS_FH(inode),
3028                 .dir_fh = NFS_FH(dir),
3029                 .name   = name,
3030                 .bitmask = server->attr_bitmask,
3031         };
3032         struct nfs4_link_res res = {
3033                 .server = server,
3034         };
3035         struct rpc_message msg = {
3036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3037                 .rpc_argp = &arg,
3038                 .rpc_resp = &res,
3039         };
3040         int status = -ENOMEM;
3041
3042         res.fattr = nfs_alloc_fattr();
3043         if (res.fattr == NULL)
3044                 goto out;
3045
3046         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3047         if (!status) {
3048                 update_changeattr(dir, &res.cinfo);
3049                 nfs_post_op_update_inode(inode, res.fattr);
3050         }
3051 out:
3052         nfs_free_fattr(res.fattr);
3053         return status;
3054 }
3055
3056 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3057 {
3058         struct nfs4_exception exception = { };
3059         int err;
3060         do {
3061                 err = nfs4_handle_exception(NFS_SERVER(inode),
3062                                 _nfs4_proc_link(inode, dir, name),
3063                                 &exception);
3064         } while (exception.retry);
3065         return err;
3066 }
3067
3068 struct nfs4_createdata {
3069         struct rpc_message msg;
3070         struct nfs4_create_arg arg;
3071         struct nfs4_create_res res;
3072         struct nfs_fh fh;
3073         struct nfs_fattr fattr;
3074 };
3075
3076 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3077                 struct qstr *name, struct iattr *sattr, u32 ftype)
3078 {
3079         struct nfs4_createdata *data;
3080
3081         data = kzalloc(sizeof(*data), GFP_KERNEL);
3082         if (data != NULL) {
3083                 struct nfs_server *server = NFS_SERVER(dir);
3084
3085                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3086                 data->msg.rpc_argp = &data->arg;
3087                 data->msg.rpc_resp = &data->res;
3088                 data->arg.dir_fh = NFS_FH(dir);
3089                 data->arg.server = server;
3090                 data->arg.name = name;
3091                 data->arg.attrs = sattr;
3092                 data->arg.ftype = ftype;
3093                 data->arg.bitmask = server->attr_bitmask;
3094                 data->res.server = server;
3095                 data->res.fh = &data->fh;
3096                 data->res.fattr = &data->fattr;
3097                 nfs_fattr_init(data->res.fattr);
3098         }
3099         return data;
3100 }
3101
3102 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3103 {
3104         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3105                                     &data->arg.seq_args, &data->res.seq_res, 1);
3106         if (status == 0) {
3107                 update_changeattr(dir, &data->res.dir_cinfo);
3108                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3109         }
3110         return status;
3111 }
3112
3113 static void nfs4_free_createdata(struct nfs4_createdata *data)
3114 {
3115         kfree(data);
3116 }
3117
3118 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3119                 struct page *page, unsigned int len, struct iattr *sattr)
3120 {
3121         struct nfs4_createdata *data;
3122         int status = -ENAMETOOLONG;
3123
3124         if (len > NFS4_MAXPATHLEN)
3125                 goto out;
3126
3127         status = -ENOMEM;
3128         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3129         if (data == NULL)
3130                 goto out;
3131
3132         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3133         data->arg.u.symlink.pages = &page;
3134         data->arg.u.symlink.len = len;
3135
3136         status = nfs4_do_create(dir, dentry, data);
3137
3138         nfs4_free_createdata(data);
3139 out:
3140         return status;
3141 }
3142
3143 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3144                 struct page *page, unsigned int len, struct iattr *sattr)
3145 {
3146         struct nfs4_exception exception = { };
3147         int err;
3148         do {
3149                 err = nfs4_handle_exception(NFS_SERVER(dir),
3150                                 _nfs4_proc_symlink(dir, dentry, page,
3151                                                         len, sattr),
3152                                 &exception);
3153         } while (exception.retry);
3154         return err;
3155 }
3156
3157 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3158                 struct iattr *sattr)
3159 {
3160         struct nfs4_createdata *data;
3161         int status = -ENOMEM;
3162
3163         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3164         if (data == NULL)
3165                 goto out;
3166
3167         status = nfs4_do_create(dir, dentry, data);
3168
3169         nfs4_free_createdata(data);
3170 out:
3171         return status;
3172 }
3173
3174 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3175                 struct iattr *sattr)
3176 {
3177         struct nfs4_exception exception = { };
3178         int err;
3179
3180         sattr->ia_mode &= ~current_umask();
3181         do {
3182                 err = nfs4_handle_exception(NFS_SERVER(dir),
3183                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3184                                 &exception);
3185         } while (exception.retry);
3186         return err;
3187 }
3188
3189 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3190                 u64 cookie, struct page **pages, unsigned int count, int plus)
3191 {
3192         struct inode            *dir = dentry->d_inode;
3193         struct nfs4_readdir_arg args = {
3194                 .fh = NFS_FH(dir),
3195                 .pages = pages,
3196                 .pgbase = 0,
3197                 .count = count,
3198                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3199                 .plus = plus,
3200         };
3201         struct nfs4_readdir_res res;
3202         struct rpc_message msg = {
3203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3204                 .rpc_argp = &args,
3205                 .rpc_resp = &res,
3206                 .rpc_cred = cred,
3207         };
3208         int                     status;
3209
3210         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3211                         dentry->d_parent->d_name.name,
3212                         dentry->d_name.name,
3213                         (unsigned long long)cookie);
3214         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3215         res.pgbase = args.pgbase;
3216         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3217         if (status >= 0) {
3218                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3219                 status += args.pgbase;
3220         }
3221
3222         nfs_invalidate_atime(dir);
3223
3224         dprintk("%s: returns %d\n", __func__, status);
3225         return status;
3226 }
3227
3228 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3229                 u64 cookie, struct page **pages, unsigned int count, int plus)
3230 {
3231         struct nfs4_exception exception = { };
3232         int err;
3233         do {
3234                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3235                                 _nfs4_proc_readdir(dentry, cred, cookie,
3236                                         pages, count, plus),
3237                                 &exception);
3238         } while (exception.retry);
3239         return err;
3240 }
3241
3242 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3243                 struct iattr *sattr, dev_t rdev)
3244 {
3245         struct nfs4_createdata *data;
3246         int mode = sattr->ia_mode;
3247         int status = -ENOMEM;
3248
3249         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3250         if (data == NULL)
3251                 goto out;
3252
3253         if (S_ISFIFO(mode))
3254                 data->arg.ftype = NF4FIFO;
3255         else if (S_ISBLK(mode)) {
3256                 data->arg.ftype = NF4BLK;
3257                 data->arg.u.device.specdata1 = MAJOR(rdev);
3258                 data->arg.u.device.specdata2 = MINOR(rdev);
3259         }
3260         else if (S_ISCHR(mode)) {
3261                 data->arg.ftype = NF4CHR;
3262                 data->arg.u.device.specdata1 = MAJOR(rdev);
3263                 data->arg.u.device.specdata2 = MINOR(rdev);
3264         } else if (!S_ISSOCK(mode)) {
3265                 status = -EINVAL;
3266                 goto out_free;
3267         }
3268
3269         status = nfs4_do_create(dir, dentry, data);
3270 out_free:
3271         nfs4_free_createdata(data);
3272 out:
3273         return status;
3274 }
3275
3276 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3277                 struct iattr *sattr, dev_t rdev)
3278 {
3279         struct nfs4_exception exception = { };
3280         int err;
3281
3282         sattr->ia_mode &= ~current_umask();
3283         do {
3284                 err = nfs4_handle_exception(NFS_SERVER(dir),
3285                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3286                                 &exception);
3287         } while (exception.retry);
3288         return err;
3289 }
3290
3291 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3292                  struct nfs_fsstat *fsstat)
3293 {
3294         struct nfs4_statfs_arg args = {
3295                 .fh = fhandle,
3296                 .bitmask = server->attr_bitmask,
3297         };
3298         struct nfs4_statfs_res res = {
3299                 .fsstat = fsstat,
3300         };
3301         struct rpc_message msg = {
3302                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3303                 .rpc_argp = &args,
3304                 .rpc_resp = &res,
3305         };
3306
3307         nfs_fattr_init(fsstat->fattr);
3308         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3309 }
3310
3311 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3312 {
3313         struct nfs4_exception exception = { };
3314         int err;
3315         do {
3316                 err = nfs4_handle_exception(server,
3317                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3318                                 &exception);
3319         } while (exception.retry);
3320         return err;
3321 }
3322
3323 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3324                 struct nfs_fsinfo *fsinfo)
3325 {
3326         struct nfs4_fsinfo_arg args = {
3327                 .fh = fhandle,
3328                 .bitmask = server->attr_bitmask,
3329         };
3330         struct nfs4_fsinfo_res res = {
3331                 .fsinfo = fsinfo,
3332         };
3333         struct rpc_message msg = {
3334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3335                 .rpc_argp = &args,
3336                 .rpc_resp = &res,
3337         };
3338
3339         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3340 }
3341
3342 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3343 {
3344         struct nfs4_exception exception = { };
3345         int err;
3346
3347         do {
3348                 err = nfs4_handle_exception(server,
3349                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3350                                 &exception);
3351         } while (exception.retry);
3352         return err;
3353 }
3354
3355 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3356 {
3357         int error;
3358
3359         nfs_fattr_init(fsinfo->fattr);
3360         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3361         if (error == 0) {
3362                 /* block layout checks this! */
3363                 server->pnfs_blksize = fsinfo->blksize;
3364                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3365         }
3366
3367         return error;
3368 }
3369
3370 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3371                 struct nfs_pathconf *pathconf)
3372 {
3373         struct nfs4_pathconf_arg args = {
3374                 .fh = fhandle,
3375                 .bitmask = server->attr_bitmask,
3376         };
3377         struct nfs4_pathconf_res res = {
3378                 .pathconf = pathconf,
3379         };
3380         struct rpc_message msg = {
3381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3382                 .rpc_argp = &args,
3383                 .rpc_resp = &res,
3384         };
3385
3386         /* None of the pathconf attributes are mandatory to implement */
3387         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3388                 memset(pathconf, 0, sizeof(*pathconf));
3389                 return 0;
3390         }
3391
3392         nfs_fattr_init(pathconf->fattr);
3393         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3394 }
3395
3396 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3397                 struct nfs_pathconf *pathconf)
3398 {
3399         struct nfs4_exception exception = { };
3400         int err;
3401
3402         do {
3403                 err = nfs4_handle_exception(server,
3404                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3405                                 &exception);
3406         } while (exception.retry);
3407         return err;
3408 }
3409
3410 void __nfs4_read_done_cb(struct nfs_read_data *data)
3411 {
3412         nfs_invalidate_atime(data->header->inode);
3413 }
3414
3415 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3416 {
3417         struct nfs_server *server = NFS_SERVER(data->header->inode);
3418
3419         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3420                 rpc_restart_call_prepare(task);
3421                 return -EAGAIN;
3422         }
3423
3424         __nfs4_read_done_cb(data);
3425         if (task->tk_status > 0)
3426                 renew_lease(server, data->timestamp);
3427         return 0;
3428 }
3429
3430 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3431 {
3432
3433         dprintk("--> %s\n", __func__);
3434
3435         if (!nfs4_sequence_done(task, &data->res.seq_res))
3436                 return -EAGAIN;
3437
3438         return data->read_done_cb ? data->read_done_cb(task, data) :
3439                                     nfs4_read_done_cb(task, data);
3440 }
3441
3442 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3443 {
3444         data->timestamp   = jiffies;
3445         data->read_done_cb = nfs4_read_done_cb;
3446         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3447         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3448 }
3449
3450 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3451 {
3452         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3453                         &data->args.seq_args,
3454                         &data->res.seq_res,
3455                         task);
3456 }
3457
3458 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3459 {
3460         struct inode *inode = data->header->inode;
3461
3462         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3463                 rpc_restart_call_prepare(task);
3464                 return -EAGAIN;
3465         }
3466         if (task->tk_status >= 0) {
3467                 renew_lease(NFS_SERVER(inode), data->timestamp);
3468                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3469         }
3470         return 0;
3471 }
3472
3473 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3474 {
3475         if (!nfs4_sequence_done(task, &data->res.seq_res))
3476                 return -EAGAIN;
3477         return data->write_done_cb ? data->write_done_cb(task, data) :
3478                 nfs4_write_done_cb(task, data);
3479 }
3480
3481 static
3482 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3483 {
3484         const struct nfs_pgio_header *hdr = data->header;
3485
3486         /* Don't request attributes for pNFS or O_DIRECT writes */
3487         if (data->ds_clp != NULL || hdr->dreq != NULL)
3488                 return false;
3489         /* Otherwise, request attributes if and only if we don't hold
3490          * a delegation
3491          */
3492         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3493 }
3494
3495 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3496 {
3497         struct nfs_server *server = NFS_SERVER(data->header->inode);
3498
3499         if (!nfs4_write_need_cache_consistency_data(data)) {
3500                 data->args.bitmask = NULL;
3501                 data->res.fattr = NULL;
3502         } else
3503                 data->args.bitmask = server->cache_consistency_bitmask;
3504
3505         if (!data->write_done_cb)
3506                 data->write_done_cb = nfs4_write_done_cb;
3507         data->res.server = server;
3508         data->timestamp   = jiffies;
3509
3510         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3511         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3512 }
3513
3514 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3515 {
3516         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3517                         &data->args.seq_args,
3518                         &data->res.seq_res,
3519                         task);
3520 }
3521
3522 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3523 {
3524         nfs4_setup_sequence(NFS_SERVER(data->inode),
3525                         &data->args.seq_args,
3526                         &data->res.seq_res,
3527                         task);
3528 }
3529
3530 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3531 {
3532         struct inode *inode = data->inode;
3533
3534         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3535                 rpc_restart_call_prepare(task);
3536                 return -EAGAIN;
3537         }
3538         return 0;
3539 }
3540
3541 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3542 {
3543         if (!nfs4_sequence_done(task, &data->res.seq_res))
3544                 return -EAGAIN;
3545         return data->commit_done_cb(task, data);
3546 }
3547
3548 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3549 {
3550         struct nfs_server *server = NFS_SERVER(data->inode);
3551
3552         if (data->commit_done_cb == NULL)
3553                 data->commit_done_cb = nfs4_commit_done_cb;
3554         data->res.server = server;
3555         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3556         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3557 }
3558
3559 struct nfs4_renewdata {
3560         struct nfs_client       *client;
3561         unsigned long           timestamp;
3562 };
3563
3564 /*
3565  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3566  * standalone procedure for queueing an asynchronous RENEW.
3567  */
3568 static void nfs4_renew_release(void *calldata)
3569 {
3570         struct nfs4_renewdata *data = calldata;
3571         struct nfs_client *clp = data->client;
3572
3573         if (atomic_read(&clp->cl_count) > 1)
3574                 nfs4_schedule_state_renewal(clp);
3575         nfs_put_client(clp);
3576         kfree(data);
3577 }
3578
3579 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3580 {
3581         struct nfs4_renewdata *data = calldata;
3582         struct nfs_client *clp = data->client;
3583         unsigned long timestamp = data->timestamp;
3584
3585         if (task->tk_status < 0) {
3586                 /* Unless we're shutting down, schedule state recovery! */
3587                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3588                         return;
3589                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3590                         nfs4_schedule_lease_recovery(clp);
3591                         return;
3592                 }
3593                 nfs4_schedule_path_down_recovery(clp);
3594         }
3595         do_renew_lease(clp, timestamp);
3596 }
3597
3598 static const struct rpc_call_ops nfs4_renew_ops = {
3599         .rpc_call_done = nfs4_renew_done,
3600         .rpc_release = nfs4_renew_release,
3601 };
3602
3603 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3604 {
3605         struct rpc_message msg = {
3606                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3607                 .rpc_argp       = clp,
3608                 .rpc_cred       = cred,
3609         };
3610         struct nfs4_renewdata *data;
3611
3612         if (renew_flags == 0)
3613                 return 0;
3614         if (!atomic_inc_not_zero(&clp->cl_count))
3615                 return -EIO;
3616         data = kmalloc(sizeof(*data), GFP_NOFS);
3617         if (data == NULL)
3618                 return -ENOMEM;
3619         data->client = clp;
3620         data->timestamp = jiffies;
3621         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3622                         &nfs4_renew_ops, data);
3623 }
3624
3625 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3626 {
3627         struct rpc_message msg = {
3628                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3629                 .rpc_argp       = clp,
3630                 .rpc_cred       = cred,
3631         };
3632         unsigned long now = jiffies;
3633         int status;
3634
3635         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3636         if (status < 0)
3637                 return status;
3638         do_renew_lease(clp, now);
3639         return 0;
3640 }
3641
3642 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3643 {
3644         return (server->caps & NFS_CAP_ACLS)
3645                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3646                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3647 }
3648
3649 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3650  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3651  * the stack.
3652  */
3653 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3654
3655 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3656                 struct page **pages, unsigned int *pgbase)
3657 {
3658         struct page *newpage, **spages;
3659         int rc = 0;
3660         size_t len;
3661         spages = pages;
3662
3663         do {
3664                 len = min_t(size_t, PAGE_SIZE, buflen);
3665                 newpage = alloc_page(GFP_KERNEL);
3666
3667                 if (newpage == NULL)
3668                         goto unwind;
3669                 memcpy(page_address(newpage), buf, len);
3670                 buf += len;
3671                 buflen -= len;
3672                 *pages++ = newpage;
3673                 rc++;
3674         } while (buflen != 0);
3675
3676         return rc;
3677
3678 unwind:
3679         for(; rc > 0; rc--)
3680                 __free_page(spages[rc-1]);
3681         return -ENOMEM;
3682 }
3683
3684 struct nfs4_cached_acl {
3685         int cached;
3686         size_t len;
3687         char data[0];
3688 };
3689
3690 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3691 {
3692         struct nfs_inode *nfsi = NFS_I(inode);
3693
3694         spin_lock(&inode->i_lock);
3695         kfree(nfsi->nfs4_acl);
3696         nfsi->nfs4_acl = acl;
3697         spin_unlock(&inode->i_lock);
3698 }
3699
3700 static void nfs4_zap_acl_attr(struct inode *inode)
3701 {
3702         nfs4_set_cached_acl(inode, NULL);
3703 }
3704
3705 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3706 {
3707         struct nfs_inode *nfsi = NFS_I(inode);
3708         struct nfs4_cached_acl *acl;
3709         int ret = -ENOENT;
3710
3711         spin_lock(&inode->i_lock);
3712         acl = nfsi->nfs4_acl;
3713         if (acl == NULL)
3714                 goto out;
3715         if (buf == NULL) /* user is just asking for length */
3716                 goto out_len;
3717         if (acl->cached == 0)
3718                 goto out;
3719         ret = -ERANGE; /* see getxattr(2) man page */
3720         if (acl->len > buflen)
3721                 goto out;
3722         memcpy(buf, acl->data, acl->len);
3723 out_len:
3724         ret = acl->len;
3725 out:
3726         spin_unlock(&inode->i_lock);
3727         return ret;
3728 }
3729
3730 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3731 {
3732         struct nfs4_cached_acl *acl;
3733         size_t buflen = sizeof(*acl) + acl_len;
3734
3735         if (buflen <= PAGE_SIZE) {
3736                 acl = kmalloc(buflen, GFP_KERNEL);
3737                 if (acl == NULL)
3738                         goto out;
3739                 acl->cached = 1;
3740                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3741         } else {
3742                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3743                 if (acl == NULL)
3744                         goto out;
3745                 acl->cached = 0;
3746         }
3747         acl->len = acl_len;
3748 out:
3749         nfs4_set_cached_acl(inode, acl);
3750 }
3751
3752 /*
3753  * The getxattr API returns the required buffer length when called with a
3754  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3755  * the required buf.  On a NULL buf, we send a page of data to the server
3756  * guessing that the ACL request can be serviced by a page. If so, we cache
3757  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3758  * the cache. If not so, we throw away the page, and cache the required
3759  * length. The next getxattr call will then produce another round trip to
3760  * the server, this time with the input buf of the required size.
3761  */
3762 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3763 {
3764         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3765         struct nfs_getaclargs args = {
3766                 .fh = NFS_FH(inode),
3767                 .acl_pages = pages,
3768                 .acl_len = buflen,
3769         };
3770         struct nfs_getaclres res = {
3771                 .acl_len = buflen,
3772         };
3773         struct rpc_message msg = {
3774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3775                 .rpc_argp = &args,
3776                 .rpc_resp = &res,
3777         };
3778         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3779         int ret = -ENOMEM, i;
3780
3781         /* As long as we're doing a round trip to the server anyway,
3782          * let's be prepared for a page of acl data. */
3783         if (npages == 0)
3784                 npages = 1;
3785         if (npages > ARRAY_SIZE(pages))
3786                 return -ERANGE;
3787
3788         for (i = 0; i < npages; i++) {
3789                 pages[i] = alloc_page(GFP_KERNEL);
3790                 if (!pages[i])
3791                         goto out_free;
3792         }
3793
3794         /* for decoding across pages */
3795         res.acl_scratch = alloc_page(GFP_KERNEL);
3796         if (!res.acl_scratch)
3797                 goto out_free;
3798
3799         args.acl_len = npages * PAGE_SIZE;
3800         args.acl_pgbase = 0;
3801
3802         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3803                 __func__, buf, buflen, npages, args.acl_len);
3804         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3805                              &msg, &args.seq_args, &res.seq_res, 0);
3806         if (ret)
3807                 goto out_free;
3808
3809         /* Handle the case where the passed-in buffer is too short */
3810         if (res.acl_flags & NFS4_ACL_TRUNC) {
3811                 /* Did the user only issue a request for the acl length? */
3812                 if (buf == NULL)
3813                         goto out_ok;
3814                 ret = -ERANGE;
3815                 goto out_free;
3816         }
3817         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3818         if (buf)
3819                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3820 out_ok:
3821         ret = res.acl_len;
3822 out_free:
3823         for (i = 0; i < npages; i++)
3824                 if (pages[i])
3825                         __free_page(pages[i]);
3826         if (res.acl_scratch)
3827                 __free_page(res.acl_scratch);
3828         return ret;
3829 }
3830
3831 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3832 {
3833         struct nfs4_exception exception = { };
3834         ssize_t ret;
3835         do {
3836                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3837                 if (ret >= 0)
3838                         break;
3839                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3840         } while (exception.retry);
3841         return ret;
3842 }
3843
3844 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3845 {
3846         struct nfs_server *server = NFS_SERVER(inode);
3847         int ret;
3848
3849         if (!nfs4_server_supports_acls(server))
3850                 return -EOPNOTSUPP;
3851         ret = nfs_revalidate_inode(server, inode);
3852         if (ret < 0)
3853                 return ret;
3854         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3855                 nfs_zap_acl_cache(inode);
3856         ret = nfs4_read_cached_acl(inode, buf, buflen);
3857         if (ret != -ENOENT)
3858                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3859                  * but no cached acl data, just the acl length */
3860                 return ret;
3861         return nfs4_get_acl_uncached(inode, buf, buflen);
3862 }
3863
3864 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3865 {
3866         struct nfs_server *server = NFS_SERVER(inode);
3867         struct page *pages[NFS4ACL_MAXPAGES];
3868         struct nfs_setaclargs arg = {
3869                 .fh             = NFS_FH(inode),
3870                 .acl_pages      = pages,
3871                 .acl_len        = buflen,
3872         };
3873         struct nfs_setaclres res;
3874         struct rpc_message msg = {
3875                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3876                 .rpc_argp       = &arg,
3877                 .rpc_resp       = &res,
3878         };
3879         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3880         int ret, i;
3881
3882         if (!nfs4_server_supports_acls(server))
3883                 return -EOPNOTSUPP;
3884         if (npages > ARRAY_SIZE(pages))
3885                 return -ERANGE;
3886         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3887         if (i < 0)
3888                 return i;
3889         nfs4_inode_return_delegation(inode);
3890         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3891
3892         /*
3893          * Free each page after tx, so the only ref left is
3894          * held by the network stack
3895          */
3896         for (; i > 0; i--)
3897                 put_page(pages[i-1]);
3898
3899         /*
3900          * Acl update can result in inode attribute update.
3901          * so mark the attribute cache invalid.
3902          */
3903         spin_lock(&inode->i_lock);
3904         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3905         spin_unlock(&inode->i_lock);
3906         nfs_access_zap_cache(inode);
3907         nfs_zap_acl_cache(inode);
3908         return ret;
3909 }
3910
3911 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3912 {
3913         struct nfs4_exception exception = { };
3914         int err;
3915         do {
3916                 err = nfs4_handle_exception(NFS_SERVER(inode),
3917                                 __nfs4_proc_set_acl(inode, buf, buflen),
3918                                 &exception);
3919         } while (exception.retry);
3920         return err;
3921 }
3922
3923 static int
3924 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3925 {
3926         struct nfs_client *clp = server->nfs_client;
3927
3928         if (task->tk_status >= 0)
3929                 return 0;
3930         switch(task->tk_status) {
3931                 case -NFS4ERR_DELEG_REVOKED:
3932                 case -NFS4ERR_ADMIN_REVOKED:
3933                 case -NFS4ERR_BAD_STATEID:
3934                         if (state == NULL)
3935                                 break;
3936                         nfs_remove_bad_delegation(state->inode);
3937                 case -NFS4ERR_OPENMODE:
3938                         if (state == NULL)
3939                                 break;
3940                         nfs4_schedule_stateid_recovery(server, state);
3941                         goto wait_on_recovery;
3942                 case -NFS4ERR_EXPIRED:
3943                         if (state != NULL)
3944                                 nfs4_schedule_stateid_recovery(server, state);
3945                 case -NFS4ERR_STALE_STATEID:
3946                 case -NFS4ERR_STALE_CLIENTID:
3947                         nfs4_schedule_lease_recovery(clp);
3948                         goto wait_on_recovery;
3949 #if defined(CONFIG_NFS_V4_1)
3950                 case -NFS4ERR_BADSESSION:
3951                 case -NFS4ERR_BADSLOT:
3952                 case -NFS4ERR_BAD_HIGH_SLOT:
3953                 case -NFS4ERR_DEADSESSION:
3954                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3955                 case -NFS4ERR_SEQ_FALSE_RETRY:
3956                 case -NFS4ERR_SEQ_MISORDERED:
3957                         dprintk("%s ERROR %d, Reset session\n", __func__,
3958                                 task->tk_status);
3959                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3960                         task->tk_status = 0;
3961                         return -EAGAIN;
3962 #endif /* CONFIG_NFS_V4_1 */
3963                 case -NFS4ERR_DELAY:
3964                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3965                 case -NFS4ERR_GRACE:
3966                 case -EKEYEXPIRED:
3967                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3968                         task->tk_status = 0;
3969                         return -EAGAIN;
3970                 case -NFS4ERR_RETRY_UNCACHED_REP:
3971                 case -NFS4ERR_OLD_STATEID:
3972                         task->tk_status = 0;
3973                         return -EAGAIN;
3974         }
3975         task->tk_status = nfs4_map_errors(task->tk_status);
3976         return 0;
3977 wait_on_recovery:
3978         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3979         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3980                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3981         task->tk_status = 0;
3982         return -EAGAIN;
3983 }
3984
3985 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3986                                     nfs4_verifier *bootverf)
3987 {
3988         __be32 verf[2];
3989
3990         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3991                 /* An impossible timestamp guarantees this value
3992                  * will never match a generated boot time. */
3993                 verf[0] = 0;
3994                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3995         } else {
3996                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3997                 verf[0] = (__be32)nn->boot_time.tv_sec;
3998                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3999         }
4000         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4001 }
4002
4003 static unsigned int
4004 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4005                                    char *buf, size_t len)
4006 {
4007         unsigned int result;
4008
4009         rcu_read_lock();
4010         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4011                                 clp->cl_ipaddr,
4012                                 rpc_peeraddr2str(clp->cl_rpcclient,
4013                                                         RPC_DISPLAY_ADDR),
4014                                 rpc_peeraddr2str(clp->cl_rpcclient,
4015                                                         RPC_DISPLAY_PROTO));
4016         rcu_read_unlock();
4017         return result;
4018 }
4019
4020 static unsigned int
4021 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4022                                 char *buf, size_t len)
4023 {
4024         char *nodename = clp->cl_rpcclient->cl_nodename;
4025
4026         if (nfs4_client_id_uniquifier[0] != '\0')
4027                 nodename = nfs4_client_id_uniquifier;
4028         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4029                                 clp->rpc_ops->version, clp->cl_minorversion,
4030                                 nodename);
4031 }
4032
4033 /**
4034  * nfs4_proc_setclientid - Negotiate client ID
4035  * @clp: state data structure
4036  * @program: RPC program for NFSv4 callback service
4037  * @port: IP port number for NFS4 callback service
4038  * @cred: RPC credential to use for this call
4039  * @res: where to place the result
4040  *
4041  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4042  */
4043 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4044                 unsigned short port, struct rpc_cred *cred,
4045                 struct nfs4_setclientid_res *res)
4046 {
4047         nfs4_verifier sc_verifier;
4048         struct nfs4_setclientid setclientid = {
4049                 .sc_verifier = &sc_verifier,
4050                 .sc_prog = program,
4051                 .sc_cb_ident = clp->cl_cb_ident,
4052         };
4053         struct rpc_message msg = {
4054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4055                 .rpc_argp = &setclientid,
4056                 .rpc_resp = res,
4057                 .rpc_cred = cred,
4058         };
4059         int status;
4060
4061         /* nfs_client_id4 */
4062         nfs4_init_boot_verifier(clp, &sc_verifier);
4063         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4064                 setclientid.sc_name_len =
4065                                 nfs4_init_uniform_client_string(clp,
4066                                                 setclientid.sc_name,
4067                                                 sizeof(setclientid.sc_name));
4068         else
4069                 setclientid.sc_name_len =
4070                                 nfs4_init_nonuniform_client_string(clp,
4071                                                 setclientid.sc_name,
4072                                                 sizeof(setclientid.sc_name));
4073         /* cb_client4 */
4074         rcu_read_lock();
4075         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4076                                 sizeof(setclientid.sc_netid),
4077                                 rpc_peeraddr2str(clp->cl_rpcclient,
4078                                                         RPC_DISPLAY_NETID));
4079         rcu_read_unlock();
4080         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4081                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4082                                 clp->cl_ipaddr, port >> 8, port & 255);
4083
4084         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4085                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4086                 setclientid.sc_name_len, setclientid.sc_name);
4087         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4088         dprintk("NFS reply setclientid: %d\n", status);
4089         return status;
4090 }
4091
4092 /**
4093  * nfs4_proc_setclientid_confirm - Confirm client ID
4094  * @clp: state data structure
4095  * @res: result of a previous SETCLIENTID
4096  * @cred: RPC credential to use for this call
4097  *
4098  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4099  */
4100 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4101                 struct nfs4_setclientid_res *arg,
4102                 struct rpc_cred *cred)
4103 {
4104         struct nfs_fsinfo fsinfo;
4105         struct rpc_message msg = {
4106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4107                 .rpc_argp = arg,
4108                 .rpc_resp = &fsinfo,
4109                 .rpc_cred = cred,
4110         };
4111         unsigned long now;
4112         int status;
4113
4114         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4115                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4116                 clp->cl_clientid);
4117         now = jiffies;
4118         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4119         if (status == 0) {
4120                 spin_lock(&clp->cl_lock);
4121                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4122                 clp->cl_last_renewal = now;
4123                 spin_unlock(&clp->cl_lock);
4124         }
4125         dprintk("NFS reply setclientid_confirm: %d\n", status);
4126         return status;
4127 }
4128
4129 struct nfs4_delegreturndata {
4130         struct nfs4_delegreturnargs args;
4131         struct nfs4_delegreturnres res;
4132         struct nfs_fh fh;
4133         nfs4_stateid stateid;
4134         unsigned long timestamp;
4135         struct nfs_fattr fattr;
4136         int rpc_status;
4137 };
4138
4139 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4140 {
4141         struct nfs4_delegreturndata *data = calldata;
4142
4143         if (!nfs4_sequence_done(task, &data->res.seq_res))
4144                 return;
4145
4146         switch (task->tk_status) {
4147         case -NFS4ERR_STALE_STATEID:
4148         case -NFS4ERR_EXPIRED:
4149         case 0:
4150                 renew_lease(data->res.server, data->timestamp);
4151                 break;
4152         default:
4153                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4154                                 -EAGAIN) {
4155                         rpc_restart_call_prepare(task);
4156                         return;
4157                 }
4158         }
4159         data->rpc_status = task->tk_status;
4160 }
4161
4162 static void nfs4_delegreturn_release(void *calldata)
4163 {
4164         kfree(calldata);
4165 }
4166
4167 #if defined(CONFIG_NFS_V4_1)
4168 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4169 {
4170         struct nfs4_delegreturndata *d_data;
4171
4172         d_data = (struct nfs4_delegreturndata *)data;
4173
4174         nfs4_setup_sequence(d_data->res.server,
4175                         &d_data->args.seq_args,
4176                         &d_data->res.seq_res,
4177                         task);
4178 }
4179 #endif /* CONFIG_NFS_V4_1 */
4180
4181 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4182 #if defined(CONFIG_NFS_V4_1)
4183         .rpc_call_prepare = nfs4_delegreturn_prepare,
4184 #endif /* CONFIG_NFS_V4_1 */
4185         .rpc_call_done = nfs4_delegreturn_done,
4186         .rpc_release = nfs4_delegreturn_release,
4187 };
4188
4189 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4190 {
4191         struct nfs4_delegreturndata *data;
4192         struct nfs_server *server = NFS_SERVER(inode);
4193         struct rpc_task *task;
4194         struct rpc_message msg = {
4195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4196                 .rpc_cred = cred,
4197         };
4198         struct rpc_task_setup task_setup_data = {
4199                 .rpc_client = server->client,
4200                 .rpc_message = &msg,
4201                 .callback_ops = &nfs4_delegreturn_ops,
4202                 .flags = RPC_TASK_ASYNC,
4203         };
4204         int status = 0;
4205
4206         data = kzalloc(sizeof(*data), GFP_NOFS);
4207         if (data == NULL)
4208                 return -ENOMEM;
4209         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4210         data->args.fhandle = &data->fh;
4211         data->args.stateid = &data->stateid;
4212         data->args.bitmask = server->cache_consistency_bitmask;
4213         nfs_copy_fh(&data->fh, NFS_FH(inode));
4214         nfs4_stateid_copy(&data->stateid, stateid);
4215         data->res.fattr = &data->fattr;
4216         data->res.server = server;
4217         nfs_fattr_init(data->res.fattr);
4218         data->timestamp = jiffies;
4219         data->rpc_status = 0;
4220
4221         task_setup_data.callback_data = data;
4222         msg.rpc_argp = &data->args;
4223         msg.rpc_resp = &data->res;
4224         task = rpc_run_task(&task_setup_data);
4225         if (IS_ERR(task))
4226                 return PTR_ERR(task);
4227         if (!issync)
4228                 goto out;
4229         status = nfs4_wait_for_completion_rpc_task(task);
4230         if (status != 0)
4231                 goto out;
4232         status = data->rpc_status;
4233         if (status == 0)
4234                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4235         else
4236                 nfs_refresh_inode(inode, &data->fattr);
4237 out:
4238         rpc_put_task(task);
4239         return status;
4240 }
4241
4242 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4243 {
4244         struct nfs_server *server = NFS_SERVER(inode);
4245         struct nfs4_exception exception = { };
4246         int err;
4247         do {
4248                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4249                 switch (err) {
4250                         case -NFS4ERR_STALE_STATEID:
4251                         case -NFS4ERR_EXPIRED:
4252                         case 0:
4253                                 return 0;
4254                 }
4255                 err = nfs4_handle_exception(server, err, &exception);
4256         } while (exception.retry);
4257         return err;
4258 }
4259
4260 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4261 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4262
4263 /*
4264  * sleep, with exponential backoff, and retry the LOCK operation.
4265  */
4266 static unsigned long
4267 nfs4_set_lock_task_retry(unsigned long timeout)
4268 {
4269         freezable_schedule_timeout_killable(timeout);
4270         timeout <<= 1;
4271         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4272                 return NFS4_LOCK_MAXTIMEOUT;
4273         return timeout;
4274 }
4275
4276 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4277 {
4278         struct inode *inode = state->inode;
4279         struct nfs_server *server = NFS_SERVER(inode);
4280         struct nfs_client *clp = server->nfs_client;
4281         struct nfs_lockt_args arg = {
4282                 .fh = NFS_FH(inode),
4283                 .fl = request,
4284         };
4285         struct nfs_lockt_res res = {
4286                 .denied = request,
4287         };
4288         struct rpc_message msg = {
4289                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4290                 .rpc_argp       = &arg,
4291                 .rpc_resp       = &res,
4292                 .rpc_cred       = state->owner->so_cred,
4293         };
4294         struct nfs4_lock_state *lsp;
4295         int status;
4296
4297         arg.lock_owner.clientid = clp->cl_clientid;
4298         status = nfs4_set_lock_state(state, request);
4299         if (status != 0)
4300                 goto out;
4301         lsp = request->fl_u.nfs4_fl.owner;
4302         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4303         arg.lock_owner.s_dev = server->s_dev;
4304         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4305         switch (status) {
4306                 case 0:
4307                         request->fl_type = F_UNLCK;
4308                         break;
4309                 case -NFS4ERR_DENIED:
4310                         status = 0;
4311         }
4312         request->fl_ops->fl_release_private(request);
4313 out:
4314         return status;
4315 }
4316
4317 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4318 {
4319         struct nfs4_exception exception = { };
4320         int err;
4321
4322         do {
4323                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4324                                 _nfs4_proc_getlk(state, cmd, request),
4325                                 &exception);
4326         } while (exception.retry);
4327         return err;
4328 }
4329
4330 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4331 {
4332         int res = 0;
4333         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4334                 case FL_POSIX:
4335                         res = posix_lock_file_wait(file, fl);
4336                         break;
4337                 case FL_FLOCK:
4338                         res = flock_lock_file_wait(file, fl);
4339                         break;
4340                 default:
4341                         BUG();
4342         }
4343         return res;
4344 }
4345
4346 struct nfs4_unlockdata {
4347         struct nfs_locku_args arg;
4348         struct nfs_locku_res res;
4349         struct nfs4_lock_state *lsp;
4350         struct nfs_open_context *ctx;
4351         struct file_lock fl;
4352         const struct nfs_server *server;
4353         unsigned long timestamp;
4354 };
4355
4356 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4357                 struct nfs_open_context *ctx,
4358                 struct nfs4_lock_state *lsp,
4359                 struct nfs_seqid *seqid)
4360 {
4361         struct nfs4_unlockdata *p;
4362         struct inode *inode = lsp->ls_state->inode;
4363
4364         p = kzalloc(sizeof(*p), GFP_NOFS);
4365         if (p == NULL)
4366                 return NULL;
4367         p->arg.fh = NFS_FH(inode);
4368         p->arg.fl = &p->fl;
4369         p->arg.seqid = seqid;
4370         p->res.seqid = seqid;
4371         p->arg.stateid = &lsp->ls_stateid;
4372         p->lsp = lsp;
4373         atomic_inc(&lsp->ls_count);
4374         /* Ensure we don't close file until we're done freeing locks! */
4375         p->ctx = get_nfs_open_context(ctx);
4376         memcpy(&p->fl, fl, sizeof(p->fl));
4377         p->server = NFS_SERVER(inode);
4378         return p;
4379 }
4380
4381 static void nfs4_locku_release_calldata(void *data)
4382 {
4383         struct nfs4_unlockdata *calldata = data;
4384         nfs_free_seqid(calldata->arg.seqid);
4385         nfs4_put_lock_state(calldata->lsp);
4386         put_nfs_open_context(calldata->ctx);
4387         kfree(calldata);
4388 }
4389
4390 static void nfs4_locku_done(struct rpc_task *task, void *data)
4391 {
4392         struct nfs4_unlockdata *calldata = data;
4393
4394         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4395                 return;
4396         switch (task->tk_status) {
4397                 case 0:
4398                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4399                                         &calldata->res.stateid);
4400                         renew_lease(calldata->server, calldata->timestamp);
4401                         break;
4402                 case -NFS4ERR_BAD_STATEID:
4403                 case -NFS4ERR_OLD_STATEID:
4404                 case -NFS4ERR_STALE_STATEID:
4405                 case -NFS4ERR_EXPIRED:
4406                         break;
4407                 default:
4408                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4409                                 rpc_restart_call_prepare(task);
4410         }
4411         nfs_release_seqid(calldata->arg.seqid);
4412 }
4413
4414 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4415 {
4416         struct nfs4_unlockdata *calldata = data;
4417
4418         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4419                 return;
4420         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4421                 /* Note: exit _without_ running nfs4_locku_done */
4422                 task->tk_action = NULL;
4423                 return;
4424         }
4425         calldata->timestamp = jiffies;
4426         if (nfs4_setup_sequence(calldata->server,
4427                                 &calldata->arg.seq_args,
4428                                 &calldata->res.seq_res,
4429                                 task) != 0)
4430                 nfs_release_seqid(calldata->arg.seqid);
4431 }
4432
4433 static const struct rpc_call_ops nfs4_locku_ops = {
4434         .rpc_call_prepare = nfs4_locku_prepare,
4435         .rpc_call_done = nfs4_locku_done,
4436         .rpc_release = nfs4_locku_release_calldata,
4437 };
4438
4439 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4440                 struct nfs_open_context *ctx,
4441                 struct nfs4_lock_state *lsp,
4442                 struct nfs_seqid *seqid)
4443 {
4444         struct nfs4_unlockdata *data;
4445         struct rpc_message msg = {
4446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4447                 .rpc_cred = ctx->cred,
4448         };
4449         struct rpc_task_setup task_setup_data = {
4450                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4451                 .rpc_message = &msg,
4452                 .callback_ops = &nfs4_locku_ops,
4453                 .workqueue = nfsiod_workqueue,
4454                 .flags = RPC_TASK_ASYNC,
4455         };
4456
4457         /* Ensure this is an unlock - when canceling a lock, the
4458          * canceled lock is passed in, and it won't be an unlock.
4459          */
4460         fl->fl_type = F_UNLCK;
4461
4462         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4463         if (data == NULL) {
4464                 nfs_free_seqid(seqid);
4465                 return ERR_PTR(-ENOMEM);
4466         }
4467
4468         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4469         msg.rpc_argp = &data->arg;
4470         msg.rpc_resp = &data->res;
4471         task_setup_data.callback_data = data;
4472         return rpc_run_task(&task_setup_data);
4473 }
4474
4475 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4476 {
4477         struct nfs_inode *nfsi = NFS_I(state->inode);
4478         struct nfs_seqid *seqid;
4479         struct nfs4_lock_state *lsp;
4480         struct rpc_task *task;
4481         int status = 0;
4482         unsigned char fl_flags = request->fl_flags;
4483
4484         status = nfs4_set_lock_state(state, request);
4485         /* Unlock _before_ we do the RPC call */
4486         request->fl_flags |= FL_EXISTS;
4487         down_read(&nfsi->rwsem);
4488         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4489                 up_read(&nfsi->rwsem);
4490                 goto out;
4491         }
4492         up_read(&nfsi->rwsem);
4493         if (status != 0)
4494                 goto out;
4495         /* Is this a delegated lock? */
4496         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4497                 goto out;
4498         lsp = request->fl_u.nfs4_fl.owner;
4499         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4500         status = -ENOMEM;
4501         if (seqid == NULL)
4502                 goto out;
4503         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4504         status = PTR_ERR(task);
4505         if (IS_ERR(task))
4506                 goto out;
4507         status = nfs4_wait_for_completion_rpc_task(task);
4508         rpc_put_task(task);
4509 out:
4510         request->fl_flags = fl_flags;
4511         return status;
4512 }
4513
4514 struct nfs4_lockdata {
4515         struct nfs_lock_args arg;
4516         struct nfs_lock_res res;
4517         struct nfs4_lock_state *lsp;
4518         struct nfs_open_context *ctx;
4519         struct file_lock fl;
4520         unsigned long timestamp;
4521         int rpc_status;
4522         int cancelled;
4523         struct nfs_server *server;
4524 };
4525
4526 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4527                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4528                 gfp_t gfp_mask)
4529 {
4530         struct nfs4_lockdata *p;
4531         struct inode *inode = lsp->ls_state->inode;
4532         struct nfs_server *server = NFS_SERVER(inode);
4533
4534         p = kzalloc(sizeof(*p), gfp_mask);
4535         if (p == NULL)
4536                 return NULL;
4537
4538         p->arg.fh = NFS_FH(inode);
4539         p->arg.fl = &p->fl;
4540         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4541         if (p->arg.open_seqid == NULL)
4542                 goto out_free;
4543         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4544         if (p->arg.lock_seqid == NULL)
4545                 goto out_free_seqid;
4546         p->arg.lock_stateid = &lsp->ls_stateid;
4547         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4548         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4549         p->arg.lock_owner.s_dev = server->s_dev;
4550         p->res.lock_seqid = p->arg.lock_seqid;
4551         p->lsp = lsp;
4552         p->server = server;
4553         atomic_inc(&lsp->ls_count);
4554         p->ctx = get_nfs_open_context(ctx);
4555         memcpy(&p->fl, fl, sizeof(p->fl));
4556         return p;
4557 out_free_seqid:
4558         nfs_free_seqid(p->arg.open_seqid);
4559 out_free:
4560         kfree(p);
4561         return NULL;
4562 }
4563
4564 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4565 {
4566         struct nfs4_lockdata *data = calldata;
4567         struct nfs4_state *state = data->lsp->ls_state;
4568
4569         dprintk("%s: begin!\n", __func__);
4570         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4571                 return;
4572         /* Do we need to do an open_to_lock_owner? */
4573         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4574                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4575                         goto out_release_lock_seqid;
4576                 data->arg.open_stateid = &state->stateid;
4577                 data->arg.new_lock_owner = 1;
4578                 data->res.open_seqid = data->arg.open_seqid;
4579         } else
4580                 data->arg.new_lock_owner = 0;
4581         data->timestamp = jiffies;
4582         if (nfs4_setup_sequence(data->server,
4583                                 &data->arg.seq_args,
4584                                 &data->res.seq_res,
4585                                 task) == 0)
4586                 return;
4587         nfs_release_seqid(data->arg.open_seqid);
4588 out_release_lock_seqid:
4589         nfs_release_seqid(data->arg.lock_seqid);
4590         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4591 }
4592
4593 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4594 {
4595         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4596         nfs4_lock_prepare(task, calldata);
4597 }
4598
4599 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4600 {
4601         struct nfs4_lockdata *data = calldata;
4602
4603         dprintk("%s: begin!\n", __func__);
4604
4605         if (!nfs4_sequence_done(task, &data->res.seq_res))
4606                 return;
4607
4608         data->rpc_status = task->tk_status;
4609         if (data->arg.new_lock_owner != 0) {
4610                 if (data->rpc_status == 0)
4611                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4612                 else
4613                         goto out;
4614         }
4615         if (data->rpc_status == 0) {
4616                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4617                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4618                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4619         }
4620 out:
4621         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4622 }
4623
4624 static void nfs4_lock_release(void *calldata)
4625 {
4626         struct nfs4_lockdata *data = calldata;
4627
4628         dprintk("%s: begin!\n", __func__);
4629         nfs_free_seqid(data->arg.open_seqid);
4630         if (data->cancelled != 0) {
4631                 struct rpc_task *task;
4632                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4633                                 data->arg.lock_seqid);
4634                 if (!IS_ERR(task))
4635                         rpc_put_task_async(task);
4636                 dprintk("%s: cancelling lock!\n", __func__);
4637         } else
4638                 nfs_free_seqid(data->arg.lock_seqid);
4639         nfs4_put_lock_state(data->lsp);
4640         put_nfs_open_context(data->ctx);
4641         kfree(data);
4642         dprintk("%s: done!\n", __func__);
4643 }
4644
4645 static const struct rpc_call_ops nfs4_lock_ops = {
4646         .rpc_call_prepare = nfs4_lock_prepare,
4647         .rpc_call_done = nfs4_lock_done,
4648         .rpc_release = nfs4_lock_release,
4649 };
4650
4651 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4652         .rpc_call_prepare = nfs4_recover_lock_prepare,
4653         .rpc_call_done = nfs4_lock_done,
4654         .rpc_release = nfs4_lock_release,
4655 };
4656
4657 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4658 {
4659         switch (error) {
4660         case -NFS4ERR_ADMIN_REVOKED:
4661         case -NFS4ERR_BAD_STATEID:
4662                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4663                 if (new_lock_owner != 0 ||
4664                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4665                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4666                 break;
4667         case -NFS4ERR_STALE_STATEID:
4668                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4669         case -NFS4ERR_EXPIRED:
4670                 nfs4_schedule_lease_recovery(server->nfs_client);
4671         };
4672 }
4673
4674 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4675 {
4676         struct nfs4_lockdata *data;
4677         struct rpc_task *task;
4678         struct rpc_message msg = {
4679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4680                 .rpc_cred = state->owner->so_cred,
4681         };
4682         struct rpc_task_setup task_setup_data = {
4683                 .rpc_client = NFS_CLIENT(state->inode),
4684                 .rpc_message = &msg,
4685                 .callback_ops = &nfs4_lock_ops,
4686                 .workqueue = nfsiod_workqueue,
4687                 .flags = RPC_TASK_ASYNC,
4688         };
4689         int ret;
4690
4691         dprintk("%s: begin!\n", __func__);
4692         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4693                         fl->fl_u.nfs4_fl.owner,
4694                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4695         if (data == NULL)
4696                 return -ENOMEM;
4697         if (IS_SETLKW(cmd))
4698                 data->arg.block = 1;
4699         if (recovery_type > NFS_LOCK_NEW) {
4700                 if (recovery_type == NFS_LOCK_RECLAIM)
4701                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4702                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4703         }
4704         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4705         msg.rpc_argp = &data->arg;
4706         msg.rpc_resp = &data->res;
4707         task_setup_data.callback_data = data;
4708         task = rpc_run_task(&task_setup_data);
4709         if (IS_ERR(task))
4710                 return PTR_ERR(task);
4711         ret = nfs4_wait_for_completion_rpc_task(task);
4712         if (ret == 0) {
4713                 ret = data->rpc_status;
4714                 if (ret)
4715                         nfs4_handle_setlk_error(data->server, data->lsp,
4716                                         data->arg.new_lock_owner, ret);
4717         } else
4718                 data->cancelled = 1;
4719         rpc_put_task(task);
4720         dprintk("%s: done, ret = %d!\n", __func__, ret);
4721         return ret;
4722 }
4723
4724 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4725 {
4726         struct nfs_server *server = NFS_SERVER(state->inode);
4727         struct nfs4_exception exception = {
4728                 .inode = state->inode,
4729         };
4730         int err;
4731
4732         do {
4733                 /* Cache the lock if possible... */
4734                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4735                         return 0;
4736                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4737                 if (err != -NFS4ERR_DELAY)
4738                         break;
4739                 nfs4_handle_exception(server, err, &exception);
4740         } while (exception.retry);
4741         return err;
4742 }
4743
4744 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4745 {
4746         struct nfs_server *server = NFS_SERVER(state->inode);
4747         struct nfs4_exception exception = {
4748                 .inode = state->inode,
4749         };
4750         int err;
4751
4752         err = nfs4_set_lock_state(state, request);
4753         if (err != 0)
4754                 return err;
4755         do {
4756                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4757                         return 0;
4758                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4759                 switch (err) {
4760                 default:
4761                         goto out;
4762                 case -NFS4ERR_GRACE:
4763                 case -NFS4ERR_DELAY:
4764                         nfs4_handle_exception(server, err, &exception);
4765                         err = 0;
4766                 }
4767         } while (exception.retry);
4768 out:
4769         return err;
4770 }
4771
4772 #if defined(CONFIG_NFS_V4_1)
4773 /**
4774  * nfs41_check_expired_locks - possibly free a lock stateid
4775  *
4776  * @state: NFSv4 state for an inode
4777  *
4778  * Returns NFS_OK if recovery for this stateid is now finished.
4779  * Otherwise a negative NFS4ERR value is returned.
4780  */
4781 static int nfs41_check_expired_locks(struct nfs4_state *state)
4782 {
4783         int status, ret = -NFS4ERR_BAD_STATEID;
4784         struct nfs4_lock_state *lsp;
4785         struct nfs_server *server = NFS_SERVER(state->inode);
4786
4787         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4788                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4789                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4790                         if (status != NFS_OK) {
4791                                 /* Free the stateid unless the server
4792                                  * informs us the stateid is unrecognized. */
4793                                 if (status != -NFS4ERR_BAD_STATEID)
4794                                         nfs41_free_stateid(server,
4795                                                         &lsp->ls_stateid);
4796                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4797                                 ret = status;
4798                         }
4799                 }
4800         };
4801
4802         return ret;
4803 }
4804
4805 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4806 {
4807         int status = NFS_OK;
4808
4809         if (test_bit(LK_STATE_IN_USE, &state->flags))
4810                 status = nfs41_check_expired_locks(state);
4811         if (status != NFS_OK)
4812                 status = nfs4_lock_expired(state, request);
4813         return status;
4814 }
4815 #endif
4816
4817 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4818 {
4819         struct nfs_inode *nfsi = NFS_I(state->inode);
4820         unsigned char fl_flags = request->fl_flags;
4821         int status = -ENOLCK;
4822
4823         if ((fl_flags & FL_POSIX) &&
4824                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4825                 goto out;
4826         /* Is this a delegated open? */
4827         status = nfs4_set_lock_state(state, request);
4828         if (status != 0)
4829                 goto out;
4830         request->fl_flags |= FL_ACCESS;
4831         status = do_vfs_lock(request->fl_file, request);
4832         if (status < 0)
4833                 goto out;
4834         down_read(&nfsi->rwsem);
4835         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4836                 /* Yes: cache locks! */
4837                 /* ...but avoid races with delegation recall... */
4838                 request->fl_flags = fl_flags & ~FL_SLEEP;
4839                 status = do_vfs_lock(request->fl_file, request);
4840                 goto out_unlock;
4841         }
4842         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4843         if (status != 0)
4844                 goto out_unlock;
4845         /* Note: we always want to sleep here! */
4846         request->fl_flags = fl_flags | FL_SLEEP;
4847         if (do_vfs_lock(request->fl_file, request) < 0)
4848                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4849                         "manager!\n", __func__);
4850 out_unlock:
4851         up_read(&nfsi->rwsem);
4852 out:
4853         request->fl_flags = fl_flags;
4854         return status;
4855 }
4856
4857 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4858 {
4859         struct nfs4_exception exception = {
4860                 .state = state,
4861                 .inode = state->inode,
4862         };
4863         int err;
4864
4865         do {
4866                 err = _nfs4_proc_setlk(state, cmd, request);
4867                 if (err == -NFS4ERR_DENIED)
4868                         err = -EAGAIN;
4869                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4870                                 err, &exception);
4871         } while (exception.retry);
4872         return err;
4873 }
4874
4875 static int
4876 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4877 {
4878         struct nfs_open_context *ctx;
4879         struct nfs4_state *state;
4880         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4881         int status;
4882
4883         /* verify open state */
4884         ctx = nfs_file_open_context(filp);
4885         state = ctx->state;
4886
4887         if (request->fl_start < 0 || request->fl_end < 0)
4888                 return -EINVAL;
4889
4890         if (IS_GETLK(cmd)) {
4891                 if (state != NULL)
4892                         return nfs4_proc_getlk(state, F_GETLK, request);
4893                 return 0;
4894         }
4895
4896         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4897                 return -EINVAL;
4898
4899         if (request->fl_type == F_UNLCK) {
4900                 if (state != NULL)
4901                         return nfs4_proc_unlck(state, cmd, request);
4902                 return 0;
4903         }
4904
4905         if (state == NULL)
4906                 return -ENOLCK;
4907         /*
4908          * Don't rely on the VFS having checked the file open mode,
4909          * since it won't do this for flock() locks.
4910          */
4911         switch (request->fl_type) {
4912         case F_RDLCK:
4913                 if (!(filp->f_mode & FMODE_READ))
4914                         return -EBADF;
4915                 break;
4916         case F_WRLCK:
4917                 if (!(filp->f_mode & FMODE_WRITE))
4918                         return -EBADF;
4919         }
4920
4921         do {
4922                 status = nfs4_proc_setlk(state, cmd, request);
4923                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4924                         break;
4925                 timeout = nfs4_set_lock_task_retry(timeout);
4926                 status = -ERESTARTSYS;
4927                 if (signalled())
4928                         break;
4929         } while(status < 0);
4930         return status;
4931 }
4932
4933 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4934 {
4935         struct nfs_server *server = NFS_SERVER(state->inode);
4936         struct nfs4_exception exception = { };
4937         int err;
4938
4939         err = nfs4_set_lock_state(state, fl);
4940         if (err != 0)
4941                 goto out;
4942         do {
4943                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4944                 switch (err) {
4945                         default:
4946                                 printk(KERN_ERR "NFS: %s: unhandled error "
4947                                         "%d.\n", __func__, err);
4948                         case 0:
4949                         case -ESTALE:
4950                                 goto out;
4951                         case -NFS4ERR_EXPIRED:
4952                                 nfs4_schedule_stateid_recovery(server, state);
4953                         case -NFS4ERR_STALE_CLIENTID:
4954                         case -NFS4ERR_STALE_STATEID:
4955                                 nfs4_schedule_lease_recovery(server->nfs_client);
4956                                 goto out;
4957                         case -NFS4ERR_BADSESSION:
4958                         case -NFS4ERR_BADSLOT:
4959                         case -NFS4ERR_BAD_HIGH_SLOT:
4960                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4961                         case -NFS4ERR_DEADSESSION:
4962                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4963                                 goto out;
4964                         case -ERESTARTSYS:
4965                                 /*
4966                                  * The show must go on: exit, but mark the
4967                                  * stateid as needing recovery.
4968                                  */
4969                         case -NFS4ERR_DELEG_REVOKED:
4970                         case -NFS4ERR_ADMIN_REVOKED:
4971                         case -NFS4ERR_BAD_STATEID:
4972                         case -NFS4ERR_OPENMODE:
4973                                 nfs4_schedule_stateid_recovery(server, state);
4974                                 err = 0;
4975                                 goto out;
4976                         case -EKEYEXPIRED:
4977                                 /*
4978                                  * User RPCSEC_GSS context has expired.
4979                                  * We cannot recover this stateid now, so
4980                                  * skip it and allow recovery thread to
4981                                  * proceed.
4982                                  */
4983                                 err = 0;
4984                                 goto out;
4985                         case -ENOMEM:
4986                         case -NFS4ERR_DENIED:
4987                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4988                                 err = 0;
4989                                 goto out;
4990                         case -NFS4ERR_DELAY:
4991                                 break;
4992                 }
4993                 err = nfs4_handle_exception(server, err, &exception);
4994         } while (exception.retry);
4995 out:
4996         return err;
4997 }
4998
4999 struct nfs_release_lockowner_data {
5000         struct nfs4_lock_state *lsp;
5001         struct nfs_server *server;
5002         struct nfs_release_lockowner_args args;
5003 };
5004
5005 static void nfs4_release_lockowner_release(void *calldata)
5006 {
5007         struct nfs_release_lockowner_data *data = calldata;
5008         nfs4_free_lock_state(data->server, data->lsp);
5009         kfree(calldata);
5010 }
5011
5012 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5013         .rpc_release = nfs4_release_lockowner_release,
5014 };
5015
5016 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5017 {
5018         struct nfs_server *server = lsp->ls_state->owner->so_server;
5019         struct nfs_release_lockowner_data *data;
5020         struct rpc_message msg = {
5021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5022         };
5023
5024         if (server->nfs_client->cl_mvops->minor_version != 0)
5025                 return -EINVAL;
5026         data = kmalloc(sizeof(*data), GFP_NOFS);
5027         if (!data)
5028                 return -ENOMEM;
5029         data->lsp = lsp;
5030         data->server = server;
5031         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5032         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5033         data->args.lock_owner.s_dev = server->s_dev;
5034         msg.rpc_argp = &data->args;
5035         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5036         return 0;
5037 }
5038
5039 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5040
5041 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5042                                    const void *buf, size_t buflen,
5043                                    int flags, int type)
5044 {
5045         if (strcmp(key, "") != 0)
5046                 return -EINVAL;
5047
5048         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5049 }
5050
5051 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5052                                    void *buf, size_t buflen, int type)
5053 {
5054         if (strcmp(key, "") != 0)
5055                 return -EINVAL;
5056
5057         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5058 }
5059
5060 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5061                                        size_t list_len, const char *name,
5062                                        size_t name_len, int type)
5063 {
5064         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5065
5066         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5067                 return 0;
5068
5069         if (list && len <= list_len)
5070                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5071         return len;
5072 }
5073
5074 /*
5075  * nfs_fhget will use either the mounted_on_fileid or the fileid
5076  */
5077 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5078 {
5079         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5080                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5081               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5082               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5083                 return;
5084
5085         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5086                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5087         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5088         fattr->nlink = 2;
5089 }
5090
5091 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5092                                    const struct qstr *name,
5093                                    struct nfs4_fs_locations *fs_locations,
5094                                    struct page *page)
5095 {
5096         struct nfs_server *server = NFS_SERVER(dir);
5097         u32 bitmask[2] = {
5098                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5099         };
5100         struct nfs4_fs_locations_arg args = {
5101                 .dir_fh = NFS_FH(dir),
5102                 .name = name,
5103                 .page = page,
5104                 .bitmask = bitmask,
5105         };
5106         struct nfs4_fs_locations_res res = {
5107                 .fs_locations = fs_locations,
5108         };
5109         struct rpc_message msg = {
5110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5111                 .rpc_argp = &args,
5112                 .rpc_resp = &res,
5113         };
5114         int status;
5115
5116         dprintk("%s: start\n", __func__);
5117
5118         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5119          * is not supported */
5120         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5121                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5122         else
5123                 bitmask[0] |= FATTR4_WORD0_FILEID;
5124
5125         nfs_fattr_init(&fs_locations->fattr);
5126         fs_locations->server = server;
5127         fs_locations->nlocations = 0;
5128         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5129         dprintk("%s: returned status = %d\n", __func__, status);
5130         return status;
5131 }
5132
5133 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5134                            const struct qstr *name,
5135                            struct nfs4_fs_locations *fs_locations,
5136                            struct page *page)
5137 {
5138         struct nfs4_exception exception = { };
5139         int err;
5140         do {
5141                 err = nfs4_handle_exception(NFS_SERVER(dir),
5142                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5143                                 &exception);
5144         } while (exception.retry);
5145         return err;
5146 }
5147
5148 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5149 {
5150         int status;
5151         struct nfs4_secinfo_arg args = {
5152                 .dir_fh = NFS_FH(dir),
5153                 .name   = name,
5154         };
5155         struct nfs4_secinfo_res res = {
5156                 .flavors     = flavors,
5157         };
5158         struct rpc_message msg = {
5159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5160                 .rpc_argp = &args,
5161                 .rpc_resp = &res,
5162         };
5163
5164         dprintk("NFS call  secinfo %s\n", name->name);
5165         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5166         dprintk("NFS reply  secinfo: %d\n", status);
5167         return status;
5168 }
5169
5170 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5171                       struct nfs4_secinfo_flavors *flavors)
5172 {
5173         struct nfs4_exception exception = { };
5174         int err;
5175         do {
5176                 err = nfs4_handle_exception(NFS_SERVER(dir),
5177                                 _nfs4_proc_secinfo(dir, name, flavors),
5178                                 &exception);
5179         } while (exception.retry);
5180         return err;
5181 }
5182
5183 #ifdef CONFIG_NFS_V4_1
5184 /*
5185  * Check the exchange flags returned by the server for invalid flags, having
5186  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5187  * DS flags set.
5188  */
5189 static int nfs4_check_cl_exchange_flags(u32 flags)
5190 {
5191         if (flags & ~EXCHGID4_FLAG_MASK_R)
5192                 goto out_inval;
5193         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5194             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5195                 goto out_inval;
5196         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5197                 goto out_inval;
5198         return NFS_OK;
5199 out_inval:
5200         return -NFS4ERR_INVAL;
5201 }
5202
5203 static bool
5204 nfs41_same_server_scope(struct nfs41_server_scope *a,
5205                         struct nfs41_server_scope *b)
5206 {
5207         if (a->server_scope_sz == b->server_scope_sz &&
5208             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5209                 return true;
5210
5211         return false;
5212 }
5213
5214 /*
5215  * nfs4_proc_bind_conn_to_session()
5216  *
5217  * The 4.1 client currently uses the same TCP connection for the
5218  * fore and backchannel.
5219  */
5220 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5221 {
5222         int status;
5223         struct nfs41_bind_conn_to_session_res res;
5224         struct rpc_message msg = {
5225                 .rpc_proc =
5226                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5227                 .rpc_argp = clp,
5228                 .rpc_resp = &res,
5229                 .rpc_cred = cred,
5230         };
5231
5232         dprintk("--> %s\n", __func__);
5233
5234         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5235         if (unlikely(res.session == NULL)) {
5236                 status = -ENOMEM;
5237                 goto out;
5238         }
5239
5240         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5241         if (status == 0) {
5242                 if (memcmp(res.session->sess_id.data,
5243                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5244                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5245                         status = -EIO;
5246                         goto out_session;
5247                 }
5248                 if (res.dir != NFS4_CDFS4_BOTH) {
5249                         dprintk("NFS: %s: Unexpected direction from server\n",
5250                                 __func__);
5251                         status = -EIO;
5252                         goto out_session;
5253                 }
5254                 if (res.use_conn_in_rdma_mode) {
5255                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5256                                 __func__);
5257                         status = -EIO;
5258                         goto out_session;
5259                 }
5260         }
5261 out_session:
5262         kfree(res.session);
5263 out:
5264         dprintk("<-- %s status= %d\n", __func__, status);
5265         return status;
5266 }
5267
5268 /*
5269  * nfs4_proc_exchange_id()
5270  *
5271  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5272  *
5273  * Since the clientid has expired, all compounds using sessions
5274  * associated with the stale clientid will be returning
5275  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5276  * be in some phase of session reset.
5277  */
5278 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5279 {
5280         nfs4_verifier verifier;
5281         struct nfs41_exchange_id_args args = {
5282                 .verifier = &verifier,
5283                 .client = clp,
5284                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5285         };
5286         struct nfs41_exchange_id_res res = {
5287                 0
5288         };
5289         int status;
5290         struct rpc_message msg = {
5291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5292                 .rpc_argp = &args,
5293                 .rpc_resp = &res,
5294                 .rpc_cred = cred,
5295         };
5296
5297         nfs4_init_boot_verifier(clp, &verifier);
5298         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5299                                                         sizeof(args.id));
5300         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5301                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5302                 args.id_len, args.id);
5303
5304         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5305                                         GFP_NOFS);
5306         if (unlikely(res.server_owner == NULL)) {
5307                 status = -ENOMEM;
5308                 goto out;
5309         }
5310
5311         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5312                                         GFP_NOFS);
5313         if (unlikely(res.server_scope == NULL)) {
5314                 status = -ENOMEM;
5315                 goto out_server_owner;
5316         }
5317
5318         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5319         if (unlikely(res.impl_id == NULL)) {
5320                 status = -ENOMEM;
5321                 goto out_server_scope;
5322         }
5323
5324         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5325         if (status == 0)
5326                 status = nfs4_check_cl_exchange_flags(res.flags);
5327
5328         if (status == 0) {
5329                 clp->cl_clientid = res.clientid;
5330                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5331                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5332                         clp->cl_seqid = res.seqid;
5333
5334                 kfree(clp->cl_serverowner);
5335                 clp->cl_serverowner = res.server_owner;
5336                 res.server_owner = NULL;
5337
5338                 /* use the most recent implementation id */
5339                 kfree(clp->cl_implid);
5340                 clp->cl_implid = res.impl_id;
5341
5342                 if (clp->cl_serverscope != NULL &&
5343                     !nfs41_same_server_scope(clp->cl_serverscope,
5344                                              res.server_scope)) {
5345                         dprintk("%s: server_scope mismatch detected\n",
5346                                 __func__);
5347                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5348                         kfree(clp->cl_serverscope);
5349                         clp->cl_serverscope = NULL;
5350                 }
5351
5352                 if (clp->cl_serverscope == NULL) {
5353                         clp->cl_serverscope = res.server_scope;
5354                         goto out;
5355                 }
5356         } else
5357                 kfree(res.impl_id);
5358
5359 out_server_owner:
5360         kfree(res.server_owner);
5361 out_server_scope:
5362         kfree(res.server_scope);
5363 out:
5364         if (clp->cl_implid != NULL)
5365                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5366                         "domain: %s, name: %s, date: %llu,%u\n",
5367                         clp->cl_implid->domain, clp->cl_implid->name,
5368                         clp->cl_implid->date.seconds,
5369                         clp->cl_implid->date.nseconds);
5370         dprintk("NFS reply exchange_id: %d\n", status);
5371         return status;
5372 }
5373
5374 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5375                 struct rpc_cred *cred)
5376 {
5377         struct rpc_message msg = {
5378                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5379                 .rpc_argp = clp,
5380                 .rpc_cred = cred,
5381         };
5382         int status;
5383
5384         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5385         if (status)
5386                 dprintk("NFS: Got error %d from the server %s on "
5387                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5388         return status;
5389 }
5390
5391 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5392                 struct rpc_cred *cred)
5393 {
5394         unsigned int loop;
5395         int ret;
5396
5397         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5398                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5399                 switch (ret) {
5400                 case -NFS4ERR_DELAY:
5401                 case -NFS4ERR_CLIENTID_BUSY:
5402                         ssleep(1);
5403                         break;
5404                 default:
5405                         return ret;
5406                 }
5407         }
5408         return 0;
5409 }
5410
5411 int nfs4_destroy_clientid(struct nfs_client *clp)
5412 {
5413         struct rpc_cred *cred;
5414         int ret = 0;
5415
5416         if (clp->cl_mvops->minor_version < 1)
5417                 goto out;
5418         if (clp->cl_exchange_flags == 0)
5419                 goto out;
5420         if (clp->cl_preserve_clid)
5421                 goto out;
5422         cred = nfs4_get_exchange_id_cred(clp);
5423         ret = nfs4_proc_destroy_clientid(clp, cred);
5424         if (cred)
5425                 put_rpccred(cred);
5426         switch (ret) {
5427         case 0:
5428         case -NFS4ERR_STALE_CLIENTID:
5429                 clp->cl_exchange_flags = 0;
5430         }
5431 out:
5432         return ret;
5433 }
5434
5435 struct nfs4_get_lease_time_data {
5436         struct nfs4_get_lease_time_args *args;
5437         struct nfs4_get_lease_time_res *res;
5438         struct nfs_client *clp;
5439 };
5440
5441 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5442                                         void *calldata)
5443 {
5444         struct nfs4_get_lease_time_data *data =
5445                         (struct nfs4_get_lease_time_data *)calldata;
5446
5447         dprintk("--> %s\n", __func__);
5448         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5449         /* just setup sequence, do not trigger session recovery
5450            since we're invoked within one */
5451         nfs41_setup_sequence(data->clp->cl_session,
5452                         &data->args->la_seq_args,
5453                         &data->res->lr_seq_res,
5454                         task);
5455         dprintk("<-- %s\n", __func__);
5456 }
5457
5458 /*
5459  * Called from nfs4_state_manager thread for session setup, so don't recover
5460  * from sequence operation or clientid errors.
5461  */
5462 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5463 {
5464         struct nfs4_get_lease_time_data *data =
5465                         (struct nfs4_get_lease_time_data *)calldata;
5466
5467         dprintk("--> %s\n", __func__);
5468         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5469                 return;
5470         switch (task->tk_status) {
5471         case -NFS4ERR_DELAY:
5472         case -NFS4ERR_GRACE:
5473                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5474                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5475                 task->tk_status = 0;
5476                 /* fall through */
5477         case -NFS4ERR_RETRY_UNCACHED_REP:
5478                 rpc_restart_call_prepare(task);
5479                 return;
5480         }
5481         dprintk("<-- %s\n", __func__);
5482 }
5483
5484 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5485         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5486         .rpc_call_done = nfs4_get_lease_time_done,
5487 };
5488
5489 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5490 {
5491         struct rpc_task *task;
5492         struct nfs4_get_lease_time_args args;
5493         struct nfs4_get_lease_time_res res = {
5494                 .lr_fsinfo = fsinfo,
5495         };
5496         struct nfs4_get_lease_time_data data = {
5497                 .args = &args,
5498                 .res = &res,
5499                 .clp = clp,
5500         };
5501         struct rpc_message msg = {
5502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5503                 .rpc_argp = &args,
5504                 .rpc_resp = &res,
5505         };
5506         struct rpc_task_setup task_setup = {
5507                 .rpc_client = clp->cl_rpcclient,
5508                 .rpc_message = &msg,
5509                 .callback_ops = &nfs4_get_lease_time_ops,
5510                 .callback_data = &data,
5511                 .flags = RPC_TASK_TIMEOUT,
5512         };
5513         int status;
5514
5515         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5516         dprintk("--> %s\n", __func__);
5517         task = rpc_run_task(&task_setup);
5518
5519         if (IS_ERR(task))
5520                 status = PTR_ERR(task);
5521         else {
5522                 status = task->tk_status;
5523                 rpc_put_task(task);
5524         }
5525         dprintk("<-- %s return %d\n", __func__, status);
5526
5527         return status;
5528 }
5529
5530 /*
5531  * Initialize the values to be used by the client in CREATE_SESSION
5532  * If nfs4_init_session set the fore channel request and response sizes,
5533  * use them.
5534  *
5535  * Set the back channel max_resp_sz_cached to zero to force the client to
5536  * always set csa_cachethis to FALSE because the current implementation
5537  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5538  */
5539 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5540 {
5541         struct nfs4_session *session = args->client->cl_session;
5542         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5543                      mxresp_sz = session->fc_target_max_resp_sz;
5544
5545         if (mxrqst_sz == 0)
5546                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5547         if (mxresp_sz == 0)
5548                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5549         /* Fore channel attributes */
5550         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5551         args->fc_attrs.max_resp_sz = mxresp_sz;
5552         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5553         args->fc_attrs.max_reqs = max_session_slots;
5554
5555         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5556                 "max_ops=%u max_reqs=%u\n",
5557                 __func__,
5558                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5559                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5560
5561         /* Back channel attributes */
5562         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5563         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5564         args->bc_attrs.max_resp_sz_cached = 0;
5565         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5566         args->bc_attrs.max_reqs = 1;
5567
5568         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5569                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5570                 __func__,
5571                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5572                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5573                 args->bc_attrs.max_reqs);
5574 }
5575
5576 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5577 {
5578         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5579         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5580
5581         if (rcvd->max_resp_sz > sent->max_resp_sz)
5582                 return -EINVAL;
5583         /*
5584          * Our requested max_ops is the minimum we need; we're not
5585          * prepared to break up compounds into smaller pieces than that.
5586          * So, no point even trying to continue if the server won't
5587          * cooperate:
5588          */
5589         if (rcvd->max_ops < sent->max_ops)
5590                 return -EINVAL;
5591         if (rcvd->max_reqs == 0)
5592                 return -EINVAL;
5593         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5594                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5595         return 0;
5596 }
5597
5598 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5599 {
5600         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5601         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5602
5603         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5604                 return -EINVAL;
5605         if (rcvd->max_resp_sz < sent->max_resp_sz)
5606                 return -EINVAL;
5607         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5608                 return -EINVAL;
5609         /* These would render the backchannel useless: */
5610         if (rcvd->max_ops != sent->max_ops)
5611                 return -EINVAL;
5612         if (rcvd->max_reqs != sent->max_reqs)
5613                 return -EINVAL;
5614         return 0;
5615 }
5616
5617 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5618                                      struct nfs4_session *session)
5619 {
5620         int ret;
5621
5622         ret = nfs4_verify_fore_channel_attrs(args, session);
5623         if (ret)
5624                 return ret;
5625         return nfs4_verify_back_channel_attrs(args, session);
5626 }
5627
5628 static int _nfs4_proc_create_session(struct nfs_client *clp,
5629                 struct rpc_cred *cred)
5630 {
5631         struct nfs4_session *session = clp->cl_session;
5632         struct nfs41_create_session_args args = {
5633                 .client = clp,
5634                 .cb_program = NFS4_CALLBACK,
5635         };
5636         struct nfs41_create_session_res res = {
5637                 .client = clp,
5638         };
5639         struct rpc_message msg = {
5640                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5641                 .rpc_argp = &args,
5642                 .rpc_resp = &res,
5643                 .rpc_cred = cred,
5644         };
5645         int status;
5646
5647         nfs4_init_channel_attrs(&args);
5648         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5649
5650         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5651
5652         if (!status) {
5653                 /* Verify the session's negotiated channel_attrs values */
5654                 status = nfs4_verify_channel_attrs(&args, session);
5655                 /* Increment the clientid slot sequence id */
5656                 clp->cl_seqid++;
5657         }
5658
5659         return status;
5660 }
5661
5662 /*
5663  * Issues a CREATE_SESSION operation to the server.
5664  * It is the responsibility of the caller to verify the session is
5665  * expired before calling this routine.
5666  */
5667 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5668 {
5669         int status;
5670         unsigned *ptr;
5671         struct nfs4_session *session = clp->cl_session;
5672
5673         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5674
5675         status = _nfs4_proc_create_session(clp, cred);
5676         if (status)
5677                 goto out;
5678
5679         /* Init or reset the session slot tables */
5680         status = nfs4_setup_session_slot_tables(session);
5681         dprintk("slot table setup returned %d\n", status);
5682         if (status)
5683                 goto out;
5684
5685         ptr = (unsigned *)&session->sess_id.data[0];
5686         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5687                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5688 out:
5689         dprintk("<-- %s\n", __func__);
5690         return status;
5691 }
5692
5693 /*
5694  * Issue the over-the-wire RPC DESTROY_SESSION.
5695  * The caller must serialize access to this routine.
5696  */
5697 int nfs4_proc_destroy_session(struct nfs4_session *session,
5698                 struct rpc_cred *cred)
5699 {
5700         struct rpc_message msg = {
5701                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5702                 .rpc_argp = session,
5703                 .rpc_cred = cred,
5704         };
5705         int status = 0;
5706
5707         dprintk("--> nfs4_proc_destroy_session\n");
5708
5709         /* session is still being setup */
5710         if (session->clp->cl_cons_state != NFS_CS_READY)
5711                 return status;
5712
5713         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5714
5715         if (status)
5716                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5717                         "Session has been destroyed regardless...\n", status);
5718
5719         dprintk("<-- nfs4_proc_destroy_session\n");
5720         return status;
5721 }
5722
5723 /*
5724  * Renew the cl_session lease.
5725  */
5726 struct nfs4_sequence_data {
5727         struct nfs_client *clp;
5728         struct nfs4_sequence_args args;
5729         struct nfs4_sequence_res res;
5730 };
5731
5732 static void nfs41_sequence_release(void *data)
5733 {
5734         struct nfs4_sequence_data *calldata = data;
5735         struct nfs_client *clp = calldata->clp;
5736
5737         if (atomic_read(&clp->cl_count) > 1)
5738                 nfs4_schedule_state_renewal(clp);
5739         nfs_put_client(clp);
5740         kfree(calldata);
5741 }
5742
5743 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5744 {
5745         switch(task->tk_status) {
5746         case -NFS4ERR_DELAY:
5747                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5748                 return -EAGAIN;
5749         default:
5750                 nfs4_schedule_lease_recovery(clp);
5751         }
5752         return 0;
5753 }
5754
5755 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5756 {
5757         struct nfs4_sequence_data *calldata = data;
5758         struct nfs_client *clp = calldata->clp;
5759
5760         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5761                 return;
5762
5763         if (task->tk_status < 0) {
5764                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5765                 if (atomic_read(&clp->cl_count) == 1)
5766                         goto out;
5767
5768                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5769                         rpc_restart_call_prepare(task);
5770                         return;
5771                 }
5772         }
5773         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5774 out:
5775         dprintk("<-- %s\n", __func__);
5776 }
5777
5778 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5779 {
5780         struct nfs4_sequence_data *calldata = data;
5781         struct nfs_client *clp = calldata->clp;
5782         struct nfs4_sequence_args *args;
5783         struct nfs4_sequence_res *res;
5784
5785         args = task->tk_msg.rpc_argp;
5786         res = task->tk_msg.rpc_resp;
5787
5788         nfs41_setup_sequence(clp->cl_session, args, res, task);
5789 }
5790
5791 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5792 {
5793         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5794         nfs41_sequence_prepare(task, data);
5795 }
5796
5797 static const struct rpc_call_ops nfs41_sequence_ops = {
5798         .rpc_call_done = nfs41_sequence_call_done,
5799         .rpc_call_prepare = nfs41_sequence_prepare,
5800         .rpc_release = nfs41_sequence_release,
5801 };
5802
5803 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5804         .rpc_call_done = nfs41_sequence_call_done,
5805         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5806         .rpc_release = nfs41_sequence_release,
5807 };
5808
5809 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5810                                              const struct rpc_call_ops *seq_ops)
5811 {
5812         struct nfs4_sequence_data *calldata;
5813         struct rpc_message msg = {
5814                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5815                 .rpc_cred = cred,
5816         };
5817         struct rpc_task_setup task_setup_data = {
5818                 .rpc_client = clp->cl_rpcclient,
5819                 .rpc_message = &msg,
5820                 .callback_ops = seq_ops,
5821                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5822         };
5823
5824         if (!atomic_inc_not_zero(&clp->cl_count))
5825                 return ERR_PTR(-EIO);
5826         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5827         if (calldata == NULL) {
5828                 nfs_put_client(clp);
5829                 return ERR_PTR(-ENOMEM);
5830         }
5831         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5832         msg.rpc_argp = &calldata->args;
5833         msg.rpc_resp = &calldata->res;
5834         calldata->clp = clp;
5835         task_setup_data.callback_data = calldata;
5836
5837         return rpc_run_task(&task_setup_data);
5838 }
5839
5840 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5841 {
5842         struct rpc_task *task;
5843         int ret = 0;
5844
5845         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5846                 return 0;
5847         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5848         if (IS_ERR(task))
5849                 ret = PTR_ERR(task);
5850         else
5851                 rpc_put_task_async(task);
5852         dprintk("<-- %s status=%d\n", __func__, ret);
5853         return ret;
5854 }
5855
5856 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5857 {
5858         struct rpc_task *task;
5859         int ret;
5860
5861         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5862         if (IS_ERR(task)) {
5863                 ret = PTR_ERR(task);
5864                 goto out;
5865         }
5866         ret = rpc_wait_for_completion_task(task);
5867         if (!ret) {
5868                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5869
5870                 if (task->tk_status == 0)
5871                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5872                 ret = task->tk_status;
5873         }
5874         rpc_put_task(task);
5875 out:
5876         dprintk("<-- %s status=%d\n", __func__, ret);
5877         return ret;
5878 }
5879
5880 struct nfs4_reclaim_complete_data {
5881         struct nfs_client *clp;
5882         struct nfs41_reclaim_complete_args arg;
5883         struct nfs41_reclaim_complete_res res;
5884 };
5885
5886 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5887 {
5888         struct nfs4_reclaim_complete_data *calldata = data;
5889
5890         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5891         nfs41_setup_sequence(calldata->clp->cl_session,
5892                         &calldata->arg.seq_args,
5893                         &calldata->res.seq_res,
5894                         task);
5895 }
5896
5897 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5898 {
5899         switch(task->tk_status) {
5900         case 0:
5901         case -NFS4ERR_COMPLETE_ALREADY:
5902         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5903                 break;
5904         case -NFS4ERR_DELAY:
5905                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5906                 /* fall through */
5907         case -NFS4ERR_RETRY_UNCACHED_REP:
5908                 return -EAGAIN;
5909         default:
5910                 nfs4_schedule_lease_recovery(clp);
5911         }
5912         return 0;
5913 }
5914
5915 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5916 {
5917         struct nfs4_reclaim_complete_data *calldata = data;
5918         struct nfs_client *clp = calldata->clp;
5919         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5920
5921         dprintk("--> %s\n", __func__);
5922         if (!nfs41_sequence_done(task, res))
5923                 return;
5924
5925         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5926                 rpc_restart_call_prepare(task);
5927                 return;
5928         }
5929         dprintk("<-- %s\n", __func__);
5930 }
5931
5932 static void nfs4_free_reclaim_complete_data(void *data)
5933 {
5934         struct nfs4_reclaim_complete_data *calldata = data;
5935
5936         kfree(calldata);
5937 }
5938
5939 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5940         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5941         .rpc_call_done = nfs4_reclaim_complete_done,
5942         .rpc_release = nfs4_free_reclaim_complete_data,
5943 };
5944
5945 /*
5946  * Issue a global reclaim complete.
5947  */
5948 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5949 {
5950         struct nfs4_reclaim_complete_data *calldata;
5951         struct rpc_task *task;
5952         struct rpc_message msg = {
5953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5954         };
5955         struct rpc_task_setup task_setup_data = {
5956                 .rpc_client = clp->cl_rpcclient,
5957                 .rpc_message = &msg,
5958                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5959                 .flags = RPC_TASK_ASYNC,
5960         };
5961         int status = -ENOMEM;
5962
5963         dprintk("--> %s\n", __func__);
5964         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5965         if (calldata == NULL)
5966                 goto out;
5967         calldata->clp = clp;
5968         calldata->arg.one_fs = 0;
5969
5970         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5971         msg.rpc_argp = &calldata->arg;
5972         msg.rpc_resp = &calldata->res;
5973         task_setup_data.callback_data = calldata;
5974         task = rpc_run_task(&task_setup_data);
5975         if (IS_ERR(task)) {
5976                 status = PTR_ERR(task);
5977                 goto out;
5978         }
5979         status = nfs4_wait_for_completion_rpc_task(task);
5980         if (status == 0)
5981                 status = task->tk_status;
5982         rpc_put_task(task);
5983         return 0;
5984 out:
5985         dprintk("<-- %s status=%d\n", __func__, status);
5986         return status;
5987 }
5988
5989 static void
5990 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5991 {
5992         struct nfs4_layoutget *lgp = calldata;
5993         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5994         struct nfs4_session *session = nfs4_get_session(server);
5995
5996         dprintk("--> %s\n", __func__);
5997         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5998          * right now covering the LAYOUTGET we are about to send.
5999          * However, that is not so catastrophic, and there seems
6000          * to be no way to prevent it completely.
6001          */
6002         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6003                                 &lgp->res.seq_res, task))
6004                 return;
6005         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6006                                           NFS_I(lgp->args.inode)->layout,
6007                                           lgp->args.ctx->state)) {
6008                 rpc_exit(task, NFS4_OK);
6009         }
6010 }
6011
6012 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6013 {
6014         struct nfs4_layoutget *lgp = calldata;
6015         struct inode *inode = lgp->args.inode;
6016         struct nfs_server *server = NFS_SERVER(inode);
6017         struct pnfs_layout_hdr *lo;
6018         struct nfs4_state *state = NULL;
6019
6020         dprintk("--> %s\n", __func__);
6021
6022         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6023                 goto out;
6024
6025         switch (task->tk_status) {
6026         case 0:
6027                 goto out;
6028         case -NFS4ERR_LAYOUTTRYLATER:
6029         case -NFS4ERR_RECALLCONFLICT:
6030                 task->tk_status = -NFS4ERR_DELAY;
6031                 break;
6032         case -NFS4ERR_EXPIRED:
6033         case -NFS4ERR_BAD_STATEID:
6034                 spin_lock(&inode->i_lock);
6035                 lo = NFS_I(inode)->layout;
6036                 if (!lo || list_empty(&lo->plh_segs)) {
6037                         spin_unlock(&inode->i_lock);
6038                         /* If the open stateid was bad, then recover it. */
6039                         state = lgp->args.ctx->state;
6040                 } else {
6041                         LIST_HEAD(head);
6042
6043                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6044                         spin_unlock(&inode->i_lock);
6045                         /* Mark the bad layout state as invalid, then
6046                          * retry using the open stateid. */
6047                         pnfs_free_lseg_list(&head);
6048                 }
6049         }
6050         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6051                 rpc_restart_call_prepare(task);
6052 out:
6053         dprintk("<-- %s\n", __func__);
6054 }
6055
6056 static size_t max_response_pages(struct nfs_server *server)
6057 {
6058         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6059         return nfs_page_array_len(0, max_resp_sz);
6060 }
6061
6062 static void nfs4_free_pages(struct page **pages, size_t size)
6063 {
6064         int i;
6065
6066         if (!pages)
6067                 return;
6068
6069         for (i = 0; i < size; i++) {
6070                 if (!pages[i])
6071                         break;
6072                 __free_page(pages[i]);
6073         }
6074         kfree(pages);
6075 }
6076
6077 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6078 {
6079         struct page **pages;
6080         int i;
6081
6082         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6083         if (!pages) {
6084                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6085                 return NULL;
6086         }
6087
6088         for (i = 0; i < size; i++) {
6089                 pages[i] = alloc_page(gfp_flags);
6090                 if (!pages[i]) {
6091                         dprintk("%s: failed to allocate page\n", __func__);
6092                         nfs4_free_pages(pages, size);
6093                         return NULL;
6094                 }
6095         }
6096
6097         return pages;
6098 }
6099
6100 static void nfs4_layoutget_release(void *calldata)
6101 {
6102         struct nfs4_layoutget *lgp = calldata;
6103         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6104         size_t max_pages = max_response_pages(server);
6105
6106         dprintk("--> %s\n", __func__);
6107         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6108         put_nfs_open_context(lgp->args.ctx);
6109         kfree(calldata);
6110         dprintk("<-- %s\n", __func__);
6111 }
6112
6113 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6114         .rpc_call_prepare = nfs4_layoutget_prepare,
6115         .rpc_call_done = nfs4_layoutget_done,
6116         .rpc_release = nfs4_layoutget_release,
6117 };
6118
6119 struct pnfs_layout_segment *
6120 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6121 {
6122         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6123         size_t max_pages = max_response_pages(server);
6124         struct rpc_task *task;
6125         struct rpc_message msg = {
6126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6127                 .rpc_argp = &lgp->args,
6128                 .rpc_resp = &lgp->res,
6129         };
6130         struct rpc_task_setup task_setup_data = {
6131                 .rpc_client = server->client,
6132                 .rpc_message = &msg,
6133                 .callback_ops = &nfs4_layoutget_call_ops,
6134                 .callback_data = lgp,
6135                 .flags = RPC_TASK_ASYNC,
6136         };
6137         struct pnfs_layout_segment *lseg = NULL;
6138         int status = 0;
6139
6140         dprintk("--> %s\n", __func__);
6141
6142         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6143         if (!lgp->args.layout.pages) {
6144                 nfs4_layoutget_release(lgp);
6145                 return ERR_PTR(-ENOMEM);
6146         }
6147         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6148
6149         lgp->res.layoutp = &lgp->args.layout;
6150         lgp->res.seq_res.sr_slot = NULL;
6151         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6152         task = rpc_run_task(&task_setup_data);
6153         if (IS_ERR(task))
6154                 return ERR_CAST(task);
6155         status = nfs4_wait_for_completion_rpc_task(task);
6156         if (status == 0)
6157                 status = task->tk_status;
6158         if (status == 0)
6159                 lseg = pnfs_layout_process(lgp);
6160         rpc_put_task(task);
6161         dprintk("<-- %s status=%d\n", __func__, status);
6162         if (status)
6163                 return ERR_PTR(status);
6164         return lseg;
6165 }
6166
6167 static void
6168 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6169 {
6170         struct nfs4_layoutreturn *lrp = calldata;
6171
6172         dprintk("--> %s\n", __func__);
6173         nfs41_setup_sequence(lrp->clp->cl_session,
6174                         &lrp->args.seq_args,
6175                         &lrp->res.seq_res,
6176                         task);
6177 }
6178
6179 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6180 {
6181         struct nfs4_layoutreturn *lrp = calldata;
6182         struct nfs_server *server;
6183
6184         dprintk("--> %s\n", __func__);
6185
6186         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6187                 return;
6188
6189         server = NFS_SERVER(lrp->args.inode);
6190         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6191                 rpc_restart_call_prepare(task);
6192                 return;
6193         }
6194         dprintk("<-- %s\n", __func__);
6195 }
6196
6197 static void nfs4_layoutreturn_release(void *calldata)
6198 {
6199         struct nfs4_layoutreturn *lrp = calldata;
6200         struct pnfs_layout_hdr *lo = lrp->args.layout;
6201
6202         dprintk("--> %s\n", __func__);
6203         spin_lock(&lo->plh_inode->i_lock);
6204         if (lrp->res.lrs_present)
6205                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6206         lo->plh_block_lgets--;
6207         spin_unlock(&lo->plh_inode->i_lock);
6208         pnfs_put_layout_hdr(lrp->args.layout);
6209         kfree(calldata);
6210         dprintk("<-- %s\n", __func__);
6211 }
6212
6213 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6214         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6215         .rpc_call_done = nfs4_layoutreturn_done,
6216         .rpc_release = nfs4_layoutreturn_release,
6217 };
6218
6219 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6220 {
6221         struct rpc_task *task;
6222         struct rpc_message msg = {
6223                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6224                 .rpc_argp = &lrp->args,
6225                 .rpc_resp = &lrp->res,
6226         };
6227         struct rpc_task_setup task_setup_data = {
6228                 .rpc_client = lrp->clp->cl_rpcclient,
6229                 .rpc_message = &msg,
6230                 .callback_ops = &nfs4_layoutreturn_call_ops,
6231                 .callback_data = lrp,
6232         };
6233         int status;
6234
6235         dprintk("--> %s\n", __func__);
6236         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6237         task = rpc_run_task(&task_setup_data);
6238         if (IS_ERR(task))
6239                 return PTR_ERR(task);
6240         status = task->tk_status;
6241         dprintk("<-- %s status=%d\n", __func__, status);
6242         rpc_put_task(task);
6243         return status;
6244 }
6245
6246 /*
6247  * Retrieve the list of Data Server devices from the MDS.
6248  */
6249 static int _nfs4_getdevicelist(struct nfs_server *server,
6250                                     const struct nfs_fh *fh,
6251                                     struct pnfs_devicelist *devlist)
6252 {
6253         struct nfs4_getdevicelist_args args = {
6254                 .fh = fh,
6255                 .layoutclass = server->pnfs_curr_ld->id,
6256         };
6257         struct nfs4_getdevicelist_res res = {
6258                 .devlist = devlist,
6259         };
6260         struct rpc_message msg = {
6261                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6262                 .rpc_argp = &args,
6263                 .rpc_resp = &res,
6264         };
6265         int status;
6266
6267         dprintk("--> %s\n", __func__);
6268         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6269                                 &res.seq_res, 0);
6270         dprintk("<-- %s status=%d\n", __func__, status);
6271         return status;
6272 }
6273
6274 int nfs4_proc_getdevicelist(struct nfs_server *server,
6275                             const struct nfs_fh *fh,
6276                             struct pnfs_devicelist *devlist)
6277 {
6278         struct nfs4_exception exception = { };
6279         int err;
6280
6281         do {
6282                 err = nfs4_handle_exception(server,
6283                                 _nfs4_getdevicelist(server, fh, devlist),
6284                                 &exception);
6285         } while (exception.retry);
6286
6287         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6288                 err, devlist->num_devs);
6289
6290         return err;
6291 }
6292 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6293
6294 static int
6295 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6296 {
6297         struct nfs4_getdeviceinfo_args args = {
6298                 .pdev = pdev,
6299         };
6300         struct nfs4_getdeviceinfo_res res = {
6301                 .pdev = pdev,
6302         };
6303         struct rpc_message msg = {
6304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6305                 .rpc_argp = &args,
6306                 .rpc_resp = &res,
6307         };
6308         int status;
6309
6310         dprintk("--> %s\n", __func__);
6311         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6312         dprintk("<-- %s status=%d\n", __func__, status);
6313
6314         return status;
6315 }
6316
6317 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6318 {
6319         struct nfs4_exception exception = { };
6320         int err;
6321
6322         do {
6323                 err = nfs4_handle_exception(server,
6324                                         _nfs4_proc_getdeviceinfo(server, pdev),
6325                                         &exception);
6326         } while (exception.retry);
6327         return err;
6328 }
6329 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6330
6331 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6332 {
6333         struct nfs4_layoutcommit_data *data = calldata;
6334         struct nfs_server *server = NFS_SERVER(data->args.inode);
6335         struct nfs4_session *session = nfs4_get_session(server);
6336
6337         nfs41_setup_sequence(session,
6338                         &data->args.seq_args,
6339                         &data->res.seq_res,
6340                         task);
6341 }
6342
6343 static void
6344 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6345 {
6346         struct nfs4_layoutcommit_data *data = calldata;
6347         struct nfs_server *server = NFS_SERVER(data->args.inode);
6348
6349         if (!nfs41_sequence_done(task, &data->res.seq_res))
6350                 return;
6351
6352         switch (task->tk_status) { /* Just ignore these failures */
6353         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6354         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6355         case -NFS4ERR_BADLAYOUT:     /* no layout */
6356         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6357                 task->tk_status = 0;
6358                 break;
6359         case 0:
6360                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6361                                                    data->res.fattr);
6362                 break;
6363         default:
6364                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6365                         rpc_restart_call_prepare(task);
6366                         return;
6367                 }
6368         }
6369 }
6370
6371 static void nfs4_layoutcommit_release(void *calldata)
6372 {
6373         struct nfs4_layoutcommit_data *data = calldata;
6374         struct pnfs_layout_segment *lseg, *tmp;
6375         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6376
6377         pnfs_cleanup_layoutcommit(data);
6378         /* Matched by references in pnfs_set_layoutcommit */
6379         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6380                 list_del_init(&lseg->pls_lc_list);
6381                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6382                                        &lseg->pls_flags))
6383                         pnfs_put_lseg(lseg);
6384         }
6385
6386         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6387         smp_mb__after_clear_bit();
6388         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6389
6390         put_rpccred(data->cred);
6391         kfree(data);
6392 }
6393
6394 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6395         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6396         .rpc_call_done = nfs4_layoutcommit_done,
6397         .rpc_release = nfs4_layoutcommit_release,
6398 };
6399
6400 int
6401 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6402 {
6403         struct rpc_message msg = {
6404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6405                 .rpc_argp = &data->args,
6406                 .rpc_resp = &data->res,
6407                 .rpc_cred = data->cred,
6408         };
6409         struct rpc_task_setup task_setup_data = {
6410                 .task = &data->task,
6411                 .rpc_client = NFS_CLIENT(data->args.inode),
6412                 .rpc_message = &msg,
6413                 .callback_ops = &nfs4_layoutcommit_ops,
6414                 .callback_data = data,
6415                 .flags = RPC_TASK_ASYNC,
6416         };
6417         struct rpc_task *task;
6418         int status = 0;
6419
6420         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6421                 "lbw: %llu inode %lu\n",
6422                 data->task.tk_pid, sync,
6423                 data->args.lastbytewritten,
6424                 data->args.inode->i_ino);
6425
6426         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6427         task = rpc_run_task(&task_setup_data);
6428         if (IS_ERR(task))
6429                 return PTR_ERR(task);
6430         if (sync == false)
6431                 goto out;
6432         status = nfs4_wait_for_completion_rpc_task(task);
6433         if (status != 0)
6434                 goto out;
6435         status = task->tk_status;
6436 out:
6437         dprintk("%s: status %d\n", __func__, status);
6438         rpc_put_task(task);
6439         return status;
6440 }
6441
6442 static int
6443 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6444                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6445 {
6446         struct nfs41_secinfo_no_name_args args = {
6447                 .style = SECINFO_STYLE_CURRENT_FH,
6448         };
6449         struct nfs4_secinfo_res res = {
6450                 .flavors = flavors,
6451         };
6452         struct rpc_message msg = {
6453                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6454                 .rpc_argp = &args,
6455                 .rpc_resp = &res,
6456         };
6457         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6458 }
6459
6460 static int
6461 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6462                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6463 {
6464         struct nfs4_exception exception = { };
6465         int err;
6466         do {
6467                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6468                 switch (err) {
6469                 case 0:
6470                 case -NFS4ERR_WRONGSEC:
6471                 case -NFS4ERR_NOTSUPP:
6472                         goto out;
6473                 default:
6474                         err = nfs4_handle_exception(server, err, &exception);
6475                 }
6476         } while (exception.retry);
6477 out:
6478         return err;
6479 }
6480
6481 static int
6482 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6483                     struct nfs_fsinfo *info)
6484 {
6485         int err;
6486         struct page *page;
6487         rpc_authflavor_t flavor;
6488         struct nfs4_secinfo_flavors *flavors;
6489
6490         page = alloc_page(GFP_KERNEL);
6491         if (!page) {
6492                 err = -ENOMEM;
6493                 goto out;
6494         }
6495
6496         flavors = page_address(page);
6497         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6498
6499         /*
6500          * Fall back on "guess and check" method if
6501          * the server doesn't support SECINFO_NO_NAME
6502          */
6503         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6504                 err = nfs4_find_root_sec(server, fhandle, info);
6505                 goto out_freepage;
6506         }
6507         if (err)
6508                 goto out_freepage;
6509
6510         flavor = nfs_find_best_sec(flavors);
6511         if (err == 0)
6512                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6513
6514 out_freepage:
6515         put_page(page);
6516         if (err == -EACCES)
6517                 return -EPERM;
6518 out:
6519         return err;
6520 }
6521
6522 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6523 {
6524         int status;
6525         struct nfs41_test_stateid_args args = {
6526                 .stateid = stateid,
6527         };
6528         struct nfs41_test_stateid_res res;
6529         struct rpc_message msg = {
6530                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6531                 .rpc_argp = &args,
6532                 .rpc_resp = &res,
6533         };
6534
6535         dprintk("NFS call  test_stateid %p\n", stateid);
6536         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6537         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6538         if (status != NFS_OK) {
6539                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6540                 return status;
6541         }
6542         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6543         return -res.status;
6544 }
6545
6546 /**
6547  * nfs41_test_stateid - perform a TEST_STATEID operation
6548  *
6549  * @server: server / transport on which to perform the operation
6550  * @stateid: state ID to test
6551  *
6552  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6553  * Otherwise a negative NFS4ERR value is returned if the operation
6554  * failed or the state ID is not currently valid.
6555  */
6556 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6557 {
6558         struct nfs4_exception exception = { };
6559         int err;
6560         do {
6561                 err = _nfs41_test_stateid(server, stateid);
6562                 if (err != -NFS4ERR_DELAY)
6563                         break;
6564                 nfs4_handle_exception(server, err, &exception);
6565         } while (exception.retry);
6566         return err;
6567 }
6568
6569 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6570 {
6571         struct nfs41_free_stateid_args args = {
6572                 .stateid = stateid,
6573         };
6574         struct nfs41_free_stateid_res res;
6575         struct rpc_message msg = {
6576                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6577                 .rpc_argp = &args,
6578                 .rpc_resp = &res,
6579         };
6580         int status;
6581
6582         dprintk("NFS call  free_stateid %p\n", stateid);
6583         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6584         status = nfs4_call_sync_sequence(server->client, server, &msg,
6585                                          &args.seq_args, &res.seq_res, 1);
6586         dprintk("NFS reply free_stateid: %d\n", status);
6587         return status;
6588 }
6589
6590 /**
6591  * nfs41_free_stateid - perform a FREE_STATEID operation
6592  *
6593  * @server: server / transport on which to perform the operation
6594  * @stateid: state ID to release
6595  *
6596  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6597  * negative NFS4ERR value is returned.
6598  */
6599 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6600 {
6601         struct nfs4_exception exception = { };
6602         int err;
6603         do {
6604                 err = _nfs4_free_stateid(server, stateid);
6605                 if (err != -NFS4ERR_DELAY)
6606                         break;
6607                 nfs4_handle_exception(server, err, &exception);
6608         } while (exception.retry);
6609         return err;
6610 }
6611
6612 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6613                 const nfs4_stateid *s2)
6614 {
6615         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6616                 return false;
6617
6618         if (s1->seqid == s2->seqid)
6619                 return true;
6620         if (s1->seqid == 0 || s2->seqid == 0)
6621                 return true;
6622
6623         return false;
6624 }
6625
6626 #endif /* CONFIG_NFS_V4_1 */
6627
6628 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6629                 const nfs4_stateid *s2)
6630 {
6631         return nfs4_stateid_match(s1, s2);
6632 }
6633
6634
6635 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6636         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6637         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6638         .recover_open   = nfs4_open_reclaim,
6639         .recover_lock   = nfs4_lock_reclaim,
6640         .establish_clid = nfs4_init_clientid,
6641         .get_clid_cred  = nfs4_get_setclientid_cred,
6642         .detect_trunking = nfs40_discover_server_trunking,
6643 };
6644
6645 #if defined(CONFIG_NFS_V4_1)
6646 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6647         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6648         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6649         .recover_open   = nfs4_open_reclaim,
6650         .recover_lock   = nfs4_lock_reclaim,
6651         .establish_clid = nfs41_init_clientid,
6652         .get_clid_cred  = nfs4_get_exchange_id_cred,
6653         .reclaim_complete = nfs41_proc_reclaim_complete,
6654         .detect_trunking = nfs41_discover_server_trunking,
6655 };
6656 #endif /* CONFIG_NFS_V4_1 */
6657
6658 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6659         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6660         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6661         .recover_open   = nfs4_open_expired,
6662         .recover_lock   = nfs4_lock_expired,
6663         .establish_clid = nfs4_init_clientid,
6664         .get_clid_cred  = nfs4_get_setclientid_cred,
6665 };
6666
6667 #if defined(CONFIG_NFS_V4_1)
6668 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6669         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6670         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6671         .recover_open   = nfs41_open_expired,
6672         .recover_lock   = nfs41_lock_expired,
6673         .establish_clid = nfs41_init_clientid,
6674         .get_clid_cred  = nfs4_get_exchange_id_cred,
6675 };
6676 #endif /* CONFIG_NFS_V4_1 */
6677
6678 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6679         .sched_state_renewal = nfs4_proc_async_renew,
6680         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6681         .renew_lease = nfs4_proc_renew,
6682 };
6683
6684 #if defined(CONFIG_NFS_V4_1)
6685 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6686         .sched_state_renewal = nfs41_proc_async_sequence,
6687         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6688         .renew_lease = nfs4_proc_sequence,
6689 };
6690 #endif
6691
6692 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6693         .minor_version = 0,
6694         .call_sync = _nfs4_call_sync,
6695         .match_stateid = nfs4_match_stateid,
6696         .find_root_sec = nfs4_find_root_sec,
6697         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6698         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6699         .state_renewal_ops = &nfs40_state_renewal_ops,
6700 };
6701
6702 #if defined(CONFIG_NFS_V4_1)
6703 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6704         .minor_version = 1,
6705         .call_sync = _nfs4_call_sync_session,
6706         .match_stateid = nfs41_match_stateid,
6707         .find_root_sec = nfs41_find_root_sec,
6708         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6709         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6710         .state_renewal_ops = &nfs41_state_renewal_ops,
6711 };
6712 #endif
6713
6714 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6715         [0] = &nfs_v4_0_minor_ops,
6716 #if defined(CONFIG_NFS_V4_1)
6717         [1] = &nfs_v4_1_minor_ops,
6718 #endif
6719 };
6720
6721 const struct inode_operations nfs4_dir_inode_operations = {
6722         .create         = nfs_create,
6723         .lookup         = nfs_lookup,
6724         .atomic_open    = nfs_atomic_open,
6725         .link           = nfs_link,
6726         .unlink         = nfs_unlink,
6727         .symlink        = nfs_symlink,
6728         .mkdir          = nfs_mkdir,
6729         .rmdir          = nfs_rmdir,
6730         .mknod          = nfs_mknod,
6731         .rename         = nfs_rename,
6732         .permission     = nfs_permission,
6733         .getattr        = nfs_getattr,
6734         .setattr        = nfs_setattr,
6735         .getxattr       = generic_getxattr,
6736         .setxattr       = generic_setxattr,
6737         .listxattr      = generic_listxattr,
6738         .removexattr    = generic_removexattr,
6739 };
6740
6741 static const struct inode_operations nfs4_file_inode_operations = {
6742         .permission     = nfs_permission,
6743         .getattr        = nfs_getattr,
6744         .setattr        = nfs_setattr,
6745         .getxattr       = generic_getxattr,
6746         .setxattr       = generic_setxattr,
6747         .listxattr      = generic_listxattr,
6748         .removexattr    = generic_removexattr,
6749 };
6750
6751 const struct nfs_rpc_ops nfs_v4_clientops = {
6752         .version        = 4,                    /* protocol version */
6753         .dentry_ops     = &nfs4_dentry_operations,
6754         .dir_inode_ops  = &nfs4_dir_inode_operations,
6755         .file_inode_ops = &nfs4_file_inode_operations,
6756         .file_ops       = &nfs4_file_operations,
6757         .getroot        = nfs4_proc_get_root,
6758         .submount       = nfs4_submount,
6759         .try_mount      = nfs4_try_mount,
6760         .getattr        = nfs4_proc_getattr,
6761         .setattr        = nfs4_proc_setattr,
6762         .lookup         = nfs4_proc_lookup,
6763         .access         = nfs4_proc_access,
6764         .readlink       = nfs4_proc_readlink,
6765         .create         = nfs4_proc_create,
6766         .remove         = nfs4_proc_remove,
6767         .unlink_setup   = nfs4_proc_unlink_setup,
6768         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6769         .unlink_done    = nfs4_proc_unlink_done,
6770         .rename         = nfs4_proc_rename,
6771         .rename_setup   = nfs4_proc_rename_setup,
6772         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6773         .rename_done    = nfs4_proc_rename_done,
6774         .link           = nfs4_proc_link,
6775         .symlink        = nfs4_proc_symlink,
6776         .mkdir          = nfs4_proc_mkdir,
6777         .rmdir          = nfs4_proc_remove,
6778         .readdir        = nfs4_proc_readdir,
6779         .mknod          = nfs4_proc_mknod,
6780         .statfs         = nfs4_proc_statfs,
6781         .fsinfo         = nfs4_proc_fsinfo,
6782         .pathconf       = nfs4_proc_pathconf,
6783         .set_capabilities = nfs4_server_capabilities,
6784         .decode_dirent  = nfs4_decode_dirent,
6785         .read_setup     = nfs4_proc_read_setup,
6786         .read_pageio_init = pnfs_pageio_init_read,
6787         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6788         .read_done      = nfs4_read_done,
6789         .write_setup    = nfs4_proc_write_setup,
6790         .write_pageio_init = pnfs_pageio_init_write,
6791         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6792         .write_done     = nfs4_write_done,
6793         .commit_setup   = nfs4_proc_commit_setup,
6794         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6795         .commit_done    = nfs4_commit_done,
6796         .lock           = nfs4_proc_lock,
6797         .clear_acl_cache = nfs4_zap_acl_attr,
6798         .close_context  = nfs4_close_context,
6799         .open_context   = nfs4_atomic_open,
6800         .have_delegation = nfs4_have_delegation,
6801         .return_delegation = nfs4_inode_return_delegation,
6802         .alloc_client   = nfs4_alloc_client,
6803         .init_client    = nfs4_init_client,
6804         .free_client    = nfs4_free_client,
6805         .create_server  = nfs4_create_server,
6806         .clone_server   = nfs_clone_server,
6807 };
6808
6809 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6810         .prefix = XATTR_NAME_NFSV4_ACL,
6811         .list   = nfs4_xattr_list_nfs4_acl,
6812         .get    = nfs4_xattr_get_nfs4_acl,
6813         .set    = nfs4_xattr_set_nfs4_acl,
6814 };
6815
6816 const struct xattr_handler *nfs4_xattr_handlers[] = {
6817         &nfs4_xattr_nfs4_acl_handler,
6818         NULL
6819 };
6820
6821 /*
6822  * Local variables:
6823  *  c-basic-offset: 8
6824  * End:
6825  */