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                 return 0;
 517
 518         tbl = &session->fc_slot_table;
 519
 520         task->tk_timeout = 0;
 521
 522         spin_lock(&tbl->slot_tbl_lock);
 523         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 524             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 525                 /* The state manager will wait until the slot table is empty */
 526                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 527                 spin_unlock(&tbl->slot_tbl_lock);
 528                 dprintk("%s session is draining\n", __func__);
 529                 return -EAGAIN;
 530         }
 531
 532         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 533             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535                 spin_unlock(&tbl->slot_tbl_lock);
 536                 dprintk("%s enforce FIFO order\n", __func__);
 537                 return -EAGAIN;
 538         }
 539
 540         slot = nfs4_alloc_slot(tbl);
 541         if (IS_ERR(slot)) {
 542                 /* If out of memory, try again in 1/4 second */
 543                 if (slot == ERR_PTR(-ENOMEM))
 544                         task->tk_timeout = HZ >> 2;
 545                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 546                 spin_unlock(&tbl->slot_tbl_lock);
 547                 dprintk("<-- %s: no free slots\n", __func__);
 548                 return -EAGAIN;
 549         }
 550         spin_unlock(&tbl->slot_tbl_lock);
 551
 552         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 553
 554         args->sa_slot = slot;
 555
 556         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 557                         slot->slot_nr, slot->seq_nr);
 558
 559         res->sr_slot = slot;
 560         res->sr_status_flags = 0;
 561         /*
 562          * sr_status is only set in decode_sequence, and so will remain
 563          * set to 1 if an rpc level failure occurs.
 564          */
 565         res->sr_status = 1;
 566         return 0;
 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                 goto out;
 580
 581         dprintk("--> %s clp %p session %p sr_slot %d\n",
 582                 __func__, session->clp, session, res->sr_slot ?
 583                         res->sr_slot->slot_nr : -1);
 584
 585         ret = nfs41_setup_sequence(session, args, res, task);
 586 out:
 587         dprintk("<-- %s status=%d\n", __func__, ret);
 588         return ret;
 589 }
 590
 591 struct nfs41_call_sync_data {
 592         const struct nfs_server *seq_server;
 593         struct nfs4_sequence_args *seq_args;
 594         struct nfs4_sequence_res *seq_res;
 595 };
 596
 597 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 598 {
 599         struct nfs41_call_sync_data *data = calldata;
 600
 601         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 602
 603         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 604                                 data->seq_res, task))
 605                 return;
 606         rpc_call_start(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 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 666                             struct nfs_server *server,
 667                             struct rpc_message *msg,
 668                             struct nfs4_sequence_args *args,
 669                             struct nfs4_sequence_res *res,
 670                             int cache_reply)
 671 {
 672         nfs41_init_sequence(args, res, cache_reply);
 673         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 674 }
 675
 676 #else
 677 static inline
 678 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 679                 struct nfs4_sequence_res *res, int cache_reply)
 680 {
 681 }
 682
 683 static int nfs4_sequence_done(struct rpc_task *task,
 684                                struct nfs4_sequence_res *res)
 685 {
 686         return 1;
 687 }
 688 #endif /* CONFIG_NFS_V4_1 */
 689
 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                     int cache_reply)
 696 {
 697         nfs41_init_sequence(args, res, cache_reply);
 698         return rpc_call_sync(clnt, msg, 0);
 699 }
 700
 701 static inline
 702 int nfs4_call_sync(struct rpc_clnt *clnt,
 703                    struct nfs_server *server,
 704                    struct rpc_message *msg,
 705                    struct nfs4_sequence_args *args,
 706                    struct nfs4_sequence_res *res,
 707                    int cache_reply)
 708 {
 709         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 710                                                 args, res, cache_reply);
 711 }
 712
 713 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 714 {
 715         struct nfs_inode *nfsi = NFS_I(dir);
 716
 717         spin_lock(&dir->i_lock);
 718         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 719         if (!cinfo->atomic || cinfo->before != dir->i_version)
 720                 nfs_force_lookup_revalidate(dir);
 721         dir->i_version = cinfo->after;
 722         spin_unlock(&dir->i_lock);
 723 }
 724
 725 struct nfs4_opendata {
 726         struct kref kref;
 727         struct nfs_openargs o_arg;
 728         struct nfs_openres o_res;
 729         struct nfs_open_confirmargs c_arg;
 730         struct nfs_open_confirmres c_res;
 731         struct nfs4_string owner_name;
 732         struct nfs4_string group_name;
 733         struct nfs_fattr f_attr;
 734         struct dentry *dir;
 735         struct dentry *dentry;
 736         struct nfs4_state_owner *owner;
 737         struct nfs4_state *state;
 738         struct iattr attrs;
 739         unsigned long timestamp;
 740         unsigned int rpc_done : 1;
 741         int rpc_status;
 742         int cancelled;
 743 };
 744
 745
 746 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 747 {
 748         p->o_res.f_attr = &p->f_attr;
 749         p->o_res.seqid = p->o_arg.seqid;
 750         p->c_res.seqid = p->c_arg.seqid;
 751         p->o_res.server = p->o_arg.server;
 752         p->o_res.access_request = p->o_arg.access;
 753         nfs_fattr_init(&p->f_attr);
 754         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 755 }
 756
 757 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 758                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 759                 const struct iattr *attrs,
 760                 gfp_t gfp_mask)
 761 {
 762         struct dentry *parent = dget_parent(dentry);
 763         struct inode *dir = parent->d_inode;
 764         struct nfs_server *server = NFS_SERVER(dir);
 765         struct nfs4_opendata *p;
 766
 767         p = kzalloc(sizeof(*p), gfp_mask);
 768         if (p == NULL)
 769                 goto err;
 770         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 771         if (p->o_arg.seqid == NULL)
 772                 goto err_free;
 773         nfs_sb_active(dentry->d_sb);
 774         p->dentry = dget(dentry);
 775         p->dir = parent;
 776         p->owner = sp;
 777         atomic_inc(&sp->so_count);
 778         p->o_arg.fh = NFS_FH(dir);
 779         p->o_arg.open_flags = flags;
 780         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 781         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 782          * will return permission denied for all bits until close */
 783         if (!(flags & O_EXCL)) {
 784                 /* ask server to check for all possible rights as results
 785                  * are cached */
 786                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 787                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 788         }
 789         p->o_arg.clientid = server->nfs_client->cl_clientid;
 790         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 791         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 792         p->o_arg.name = &dentry->d_name;
 793         p->o_arg.server = server;
 794         p->o_arg.bitmask = server->attr_bitmask;
 795         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 796         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 797         if (attrs != NULL && attrs->ia_valid != 0) {
 798                 __be32 verf[2];
 799
 800                 p->o_arg.u.attrs = &p->attrs;
 801                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 802
 803                 verf[0] = jiffies;
 804                 verf[1] = current->pid;
 805                 memcpy(p->o_arg.u.verifier.data, verf,
 806                                 sizeof(p->o_arg.u.verifier.data));
 807         }
 808         p->c_arg.fh = &p->o_res.fh;
 809         p->c_arg.stateid = &p->o_res.stateid;
 810         p->c_arg.seqid = p->o_arg.seqid;
 811         nfs4_init_opendata_res(p);
 812         kref_init(&p->kref);
 813         return p;
 814 err_free:
 815         kfree(p);
 816 err:
 817         dput(parent);
 818         return NULL;
 819 }
 820
 821 static void nfs4_opendata_free(struct kref *kref)
 822 {
 823         struct nfs4_opendata *p = container_of(kref,
 824                         struct nfs4_opendata, kref);
 825         struct super_block *sb = p->dentry->d_sb;
 826
 827         nfs_free_seqid(p->o_arg.seqid);
 828         if (p->state != NULL)
 829                 nfs4_put_open_state(p->state);
 830         nfs4_put_state_owner(p->owner);
 831         dput(p->dir);
 832         dput(p->dentry);
 833         nfs_sb_deactive(sb);
 834         nfs_fattr_free_names(&p->f_attr);
 835         kfree(p);
 836 }
 837
 838 static void nfs4_opendata_put(struct nfs4_opendata *p)
 839 {
 840         if (p != NULL)
 841                 kref_put(&p->kref, nfs4_opendata_free);
 842 }
 843
 844 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 845 {
 846         int ret;
 847
 848         ret = rpc_wait_for_completion_task(task);
 849         return ret;
 850 }
 851
 852 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 853 {
 854         int ret = 0;
 855
 856         if (open_mode & (O_EXCL|O_TRUNC))
 857                 goto out;
 858         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 859                 case FMODE_READ:
 860                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 861                                 && state->n_rdonly != 0;
 862                         break;
 863                 case FMODE_WRITE:
 864                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 865                                 && state->n_wronly != 0;
 866                         break;
 867                 case FMODE_READ|FMODE_WRITE:
 868                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 869                                 && state->n_rdwr != 0;
 870         }
 871 out:
 872         return ret;
 873 }
 874
 875 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 876 {
 877         if (delegation == NULL)
 878                 return 0;
 879         if ((delegation->type & fmode) != fmode)
 880                 return 0;
 881         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 882                 return 0;
 883         nfs_mark_delegation_referenced(delegation);
 884         return 1;
 885 }
 886
 887 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 888 {
 889         switch (fmode) {
 890                 case FMODE_WRITE:
 891                         state->n_wronly++;
 892                         break;
 893                 case FMODE_READ:
 894                         state->n_rdonly++;
 895                         break;
 896                 case FMODE_READ|FMODE_WRITE:
 897                         state->n_rdwr++;
 898         }
 899         nfs4_state_set_mode_locked(state, state->state | fmode);
 900 }
 901
 902 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 903 {
 904         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 905                 nfs4_stateid_copy(&state->stateid, stateid);
 906         nfs4_stateid_copy(&state->open_stateid, stateid);
 907         switch (fmode) {
 908                 case FMODE_READ:
 909                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 910                         break;
 911                 case FMODE_WRITE:
 912                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 913                         break;
 914                 case FMODE_READ|FMODE_WRITE:
 915                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 916         }
 917 }
 918
 919 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 920 {
 921         write_seqlock(&state->seqlock);
 922         nfs_set_open_stateid_locked(state, stateid, fmode);
 923         write_sequnlock(&state->seqlock);
 924 }
 925
 926 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 927 {
 928         /*
 929          * Protect the call to nfs4_state_set_mode_locked and
 930          * serialise the stateid update
 931          */
 932         write_seqlock(&state->seqlock);
 933         if (deleg_stateid != NULL) {
 934                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 935                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 936         }
 937         if (open_stateid != NULL)
 938                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 939         write_sequnlock(&state->seqlock);
 940         spin_lock(&state->owner->so_lock);
 941         update_open_stateflags(state, fmode);
 942         spin_unlock(&state->owner->so_lock);
 943 }
 944
 945 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 946 {
 947         struct nfs_inode *nfsi = NFS_I(state->inode);
 948         struct nfs_delegation *deleg_cur;
 949         int ret = 0;
 950
 951         fmode &= (FMODE_READ|FMODE_WRITE);
 952
 953         rcu_read_lock();
 954         deleg_cur = rcu_dereference(nfsi->delegation);
 955         if (deleg_cur == NULL)
 956                 goto no_delegation;
 957
 958         spin_lock(&deleg_cur->lock);
 959         if (nfsi->delegation != deleg_cur ||
 960             (deleg_cur->type & fmode) != fmode)
 961                 goto no_delegation_unlock;
 962
 963         if (delegation == NULL)
 964                 delegation = &deleg_cur->stateid;
 965         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 966                 goto no_delegation_unlock;
 967
 968         nfs_mark_delegation_referenced(deleg_cur);
 969         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 970         ret = 1;
 971 no_delegation_unlock:
 972         spin_unlock(&deleg_cur->lock);
 973 no_delegation:
 974         rcu_read_unlock();
 975
 976         if (!ret && open_stateid != NULL) {
 977                 __update_open_stateid(state, open_stateid, NULL, fmode);
 978                 ret = 1;
 979         }
 980
 981         return ret;
 982 }
 983
 984
 985 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 986 {
 987         struct nfs_delegation *delegation;
 988
 989         rcu_read_lock();
 990         delegation = rcu_dereference(NFS_I(inode)->delegation);
 991         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 992                 rcu_read_unlock();
 993                 return;
 994         }
 995         rcu_read_unlock();
 996         nfs4_inode_return_delegation(inode);
 997 }
 998
 999 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1000 {
1001         struct nfs4_state *state = opendata->state;
1002         struct nfs_inode *nfsi = NFS_I(state->inode);
1003         struct nfs_delegation *delegation;
1004         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1005         fmode_t fmode = opendata->o_arg.fmode;
1006         nfs4_stateid stateid;
1007         int ret = -EAGAIN;
1008
1009         for (;;) {
1010                 if (can_open_cached(state, fmode, open_mode)) {
1011                         spin_lock(&state->owner->so_lock);
1012                         if (can_open_cached(state, fmode, open_mode)) {
1013                                 update_open_stateflags(state, fmode);
1014                                 spin_unlock(&state->owner->so_lock);
1015                                 goto out_return_state;
1016                         }
1017                         spin_unlock(&state->owner->so_lock);
1018                 }
1019                 rcu_read_lock();
1020                 delegation = rcu_dereference(nfsi->delegation);
1021                 if (!can_open_delegated(delegation, fmode)) {
1022                         rcu_read_unlock();
1023                         break;
1024                 }
1025                 /* Save the delegation */
1026                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1027                 rcu_read_unlock();
1028                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1029                 if (ret != 0)
1030                         goto out;
1031                 ret = -EAGAIN;
1032
1033                 /* Try to update the stateid using the delegation */
1034                 if (update_open_stateid(state, NULL, &stateid, fmode))
1035                         goto out_return_state;
1036         }
1037 out:
1038         return ERR_PTR(ret);
1039 out_return_state:
1040         atomic_inc(&state->count);
1041         return state;
1042 }
1043
1044 static void
1045 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1046 {
1047         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1048         struct nfs_delegation *delegation;
1049         int delegation_flags = 0;
1050
1051         rcu_read_lock();
1052         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1053         if (delegation)
1054                 delegation_flags = delegation->flags;
1055         rcu_read_unlock();
1056         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1057                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1058                                    "returning a delegation for "
1059                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1060                                    clp->cl_hostname);
1061         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1062                 nfs_inode_set_delegation(state->inode,
1063                                          data->owner->so_cred,
1064                                          &data->o_res);
1065         else
1066                 nfs_inode_reclaim_delegation(state->inode,
1067                                              data->owner->so_cred,
1068                                              &data->o_res);
1069 }
1070
1071 /*
1072  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1073  * and update the nfs4_state.
1074  */
1075 static struct nfs4_state *
1076 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1077 {
1078         struct inode *inode = data->state->inode;
1079         struct nfs4_state *state = data->state;
1080         int ret;
1081
1082         if (!data->rpc_done) {
1083                 ret = data->rpc_status;
1084                 goto err;
1085         }
1086
1087         ret = -ESTALE;
1088         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1089             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1090             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1091                 goto err;
1092
1093         ret = -ENOMEM;
1094         state = nfs4_get_open_state(inode, data->owner);
1095         if (state == NULL)
1096                 goto err;
1097
1098         ret = nfs_refresh_inode(inode, &data->f_attr);
1099         if (ret)
1100                 goto err;
1101
1102         if (data->o_res.delegation_type != 0)
1103                 nfs4_opendata_check_deleg(data, state);
1104         update_open_stateid(state, &data->o_res.stateid, NULL,
1105                             data->o_arg.fmode);
1106
1107         return state;
1108 err:
1109         return ERR_PTR(ret);
1110
1111 }
1112
1113 static struct nfs4_state *
1114 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1115 {
1116         struct inode *inode;
1117         struct nfs4_state *state = NULL;
1118         int ret;
1119
1120         if (!data->rpc_done) {
1121                 state = nfs4_try_open_cached(data);
1122                 goto out;
1123         }
1124
1125         ret = -EAGAIN;
1126         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1127                 goto err;
1128         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1129         ret = PTR_ERR(inode);
1130         if (IS_ERR(inode))
1131                 goto err;
1132         ret = -ENOMEM;
1133         state = nfs4_get_open_state(inode, data->owner);
1134         if (state == NULL)
1135                 goto err_put_inode;
1136         if (data->o_res.delegation_type != 0)
1137                 nfs4_opendata_check_deleg(data, state);
1138         update_open_stateid(state, &data->o_res.stateid, NULL,
1139                         data->o_arg.fmode);
1140         iput(inode);
1141 out:
1142         return state;
1143 err_put_inode:
1144         iput(inode);
1145 err:
1146         return ERR_PTR(ret);
1147 }
1148
1149 static struct nfs4_state *
1150 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1151 {
1152         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1153                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1154         return _nfs4_opendata_to_nfs4_state(data);
1155 }
1156
1157 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1158 {
1159         struct nfs_inode *nfsi = NFS_I(state->inode);
1160         struct nfs_open_context *ctx;
1161
1162         spin_lock(&state->inode->i_lock);
1163         list_for_each_entry(ctx, &nfsi->open_files, list) {
1164                 if (ctx->state != state)
1165                         continue;
1166                 get_nfs_open_context(ctx);
1167                 spin_unlock(&state->inode->i_lock);
1168                 return ctx;
1169         }
1170         spin_unlock(&state->inode->i_lock);
1171         return ERR_PTR(-ENOENT);
1172 }
1173
1174 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1175 {
1176         struct nfs4_opendata *opendata;
1177
1178         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1179         if (opendata == NULL)
1180                 return ERR_PTR(-ENOMEM);
1181         opendata->state = state;
1182         atomic_inc(&state->count);
1183         return opendata;
1184 }
1185
1186 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1187 {
1188         struct nfs4_state *newstate;
1189         int ret;
1190
1191         opendata->o_arg.open_flags = 0;
1192         opendata->o_arg.fmode = fmode;
1193         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1194         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1195         nfs4_init_opendata_res(opendata);
1196         ret = _nfs4_recover_proc_open(opendata);
1197         if (ret != 0)
1198                 return ret;
1199         newstate = nfs4_opendata_to_nfs4_state(opendata);
1200         if (IS_ERR(newstate))
1201                 return PTR_ERR(newstate);
1202         nfs4_close_state(newstate, fmode);
1203         *res = newstate;
1204         return 0;
1205 }
1206
1207 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1208 {
1209         struct nfs4_state *newstate;
1210         int ret;
1211
1212         /* memory barrier prior to reading state->n_* */
1213         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1214         smp_rmb();
1215         if (state->n_rdwr != 0) {
1216                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1217                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1218                 if (ret != 0)
1219                         return ret;
1220                 if (newstate != state)
1221                         return -ESTALE;
1222         }
1223         if (state->n_wronly != 0) {
1224                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1225                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1226                 if (ret != 0)
1227                         return ret;
1228                 if (newstate != state)
1229                         return -ESTALE;
1230         }
1231         if (state->n_rdonly != 0) {
1232                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1233                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1234                 if (ret != 0)
1235                         return ret;
1236                 if (newstate != state)
1237                         return -ESTALE;
1238         }
1239         /*
1240          * We may have performed cached opens for all three recoveries.
1241          * Check if we need to update the current stateid.
1242          */
1243         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1244             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1245                 write_seqlock(&state->seqlock);
1246                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1247                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1248                 write_sequnlock(&state->seqlock);
1249         }
1250         return 0;
1251 }
1252
1253 /*
1254  * OPEN_RECLAIM:
1255  *      reclaim state on the server after a reboot.
1256  */
1257 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1258 {
1259         struct nfs_delegation *delegation;
1260         struct nfs4_opendata *opendata;
1261         fmode_t delegation_type = 0;
1262         int status;
1263
1264         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1265         if (IS_ERR(opendata))
1266                 return PTR_ERR(opendata);
1267         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1268         opendata->o_arg.fh = NFS_FH(state->inode);
1269         rcu_read_lock();
1270         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1271         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1272                 delegation_type = delegation->type;
1273         rcu_read_unlock();
1274         opendata->o_arg.u.delegation_type = delegation_type;
1275         status = nfs4_open_recover(opendata, state);
1276         nfs4_opendata_put(opendata);
1277         return status;
1278 }
1279
1280 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1281 {
1282         struct nfs_server *server = NFS_SERVER(state->inode);
1283         struct nfs4_exception exception = { };
1284         int err;
1285         do {
1286                 err = _nfs4_do_open_reclaim(ctx, state);
1287                 if (err != -NFS4ERR_DELAY)
1288                         break;
1289                 nfs4_handle_exception(server, err, &exception);
1290         } while (exception.retry);
1291         return err;
1292 }
1293
1294 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1295 {
1296         struct nfs_open_context *ctx;
1297         int ret;
1298
1299         ctx = nfs4_state_find_open_context(state);
1300         if (IS_ERR(ctx))
1301                 return PTR_ERR(ctx);
1302         ret = nfs4_do_open_reclaim(ctx, state);
1303         put_nfs_open_context(ctx);
1304         return ret;
1305 }
1306
1307 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1308 {
1309         struct nfs4_opendata *opendata;
1310         int ret;
1311
1312         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1313         if (IS_ERR(opendata))
1314                 return PTR_ERR(opendata);
1315         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1316         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1317         ret = nfs4_open_recover(opendata, state);
1318         nfs4_opendata_put(opendata);
1319         return ret;
1320 }
1321
1322 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1323 {
1324         struct nfs4_exception exception = { };
1325         struct nfs_server *server = NFS_SERVER(state->inode);
1326         int err;
1327         do {
1328                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1329                 switch (err) {
1330                         case 0:
1331                         case -ENOENT:
1332                         case -ESTALE:
1333                                 goto out;
1334                         case -NFS4ERR_BADSESSION:
1335                         case -NFS4ERR_BADSLOT:
1336                         case -NFS4ERR_BAD_HIGH_SLOT:
1337                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1338                         case -NFS4ERR_DEADSESSION:
1339                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1340                                 goto out;
1341                         case -NFS4ERR_STALE_CLIENTID:
1342                         case -NFS4ERR_STALE_STATEID:
1343                         case -NFS4ERR_EXPIRED:
1344                                 /* Don't recall a delegation if it was lost */
1345                                 nfs4_schedule_lease_recovery(server->nfs_client);
1346                                 goto out;
1347                         case -ERESTARTSYS:
1348                                 /*
1349                                  * The show must go on: exit, but mark the
1350                                  * stateid as needing recovery.
1351                                  */
1352                         case -NFS4ERR_DELEG_REVOKED:
1353                         case -NFS4ERR_ADMIN_REVOKED:
1354                         case -NFS4ERR_BAD_STATEID:
1355                                 nfs_inode_find_state_and_recover(state->inode,
1356                                                 stateid);
1357                                 nfs4_schedule_stateid_recovery(server, state);
1358                         case -EKEYEXPIRED:
1359                                 /*
1360                                  * User RPCSEC_GSS context has expired.
1361                                  * We cannot recover this stateid now, so
1362                                  * skip it and allow recovery thread to
1363                                  * proceed.
1364                                  */
1365                         case -ENOMEM:
1366                                 err = 0;
1367                                 goto out;
1368                 }
1369                 err = nfs4_handle_exception(server, err, &exception);
1370         } while (exception.retry);
1371 out:
1372         return err;
1373 }
1374
1375 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1376 {
1377         struct nfs4_opendata *data = calldata;
1378
1379         data->rpc_status = task->tk_status;
1380         if (data->rpc_status == 0) {
1381                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1382                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1383                 renew_lease(data->o_res.server, data->timestamp);
1384                 data->rpc_done = 1;
1385         }
1386 }
1387
1388 static void nfs4_open_confirm_release(void *calldata)
1389 {
1390         struct nfs4_opendata *data = calldata;
1391         struct nfs4_state *state = NULL;
1392
1393         /* If this request hasn't been cancelled, do nothing */
1394         if (data->cancelled == 0)
1395                 goto out_free;
1396         /* In case of error, no cleanup! */
1397         if (!data->rpc_done)
1398                 goto out_free;
1399         state = nfs4_opendata_to_nfs4_state(data);
1400         if (!IS_ERR(state))
1401                 nfs4_close_state(state, data->o_arg.fmode);
1402 out_free:
1403         nfs4_opendata_put(data);
1404 }
1405
1406 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1407         .rpc_call_done = nfs4_open_confirm_done,
1408         .rpc_release = nfs4_open_confirm_release,
1409 };
1410
1411 /*
1412  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1413  */
1414 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1415 {
1416         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1417         struct rpc_task *task;
1418         struct  rpc_message msg = {
1419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1420                 .rpc_argp = &data->c_arg,
1421                 .rpc_resp = &data->c_res,
1422                 .rpc_cred = data->owner->so_cred,
1423         };
1424         struct rpc_task_setup task_setup_data = {
1425                 .rpc_client = server->client,
1426                 .rpc_message = &msg,
1427                 .callback_ops = &nfs4_open_confirm_ops,
1428                 .callback_data = data,
1429                 .workqueue = nfsiod_workqueue,
1430                 .flags = RPC_TASK_ASYNC,
1431         };
1432         int status;
1433
1434         kref_get(&data->kref);
1435         data->rpc_done = 0;
1436         data->rpc_status = 0;
1437         data->timestamp = jiffies;
1438         task = rpc_run_task(&task_setup_data);
1439         if (IS_ERR(task))
1440                 return PTR_ERR(task);
1441         status = nfs4_wait_for_completion_rpc_task(task);
1442         if (status != 0) {
1443                 data->cancelled = 1;
1444                 smp_wmb();
1445         } else
1446                 status = data->rpc_status;
1447         rpc_put_task(task);
1448         return status;
1449 }
1450
1451 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1452 {
1453         struct nfs4_opendata *data = calldata;
1454         struct nfs4_state_owner *sp = data->owner;
1455
1456         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1457                 return;
1458         /*
1459          * Check if we still need to send an OPEN call, or if we can use
1460          * a delegation instead.
1461          */
1462         if (data->state != NULL) {
1463                 struct nfs_delegation *delegation;
1464
1465                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1466                         goto out_no_action;
1467                 rcu_read_lock();
1468                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1469                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1470                     can_open_delegated(delegation, data->o_arg.fmode))
1471                         goto unlock_no_action;
1472                 rcu_read_unlock();
1473         }
1474         /* Update client id. */
1475         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1476         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1477                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1478                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1479                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1480         }
1481         data->timestamp = jiffies;
1482         if (nfs4_setup_sequence(data->o_arg.server,
1483                                 &data->o_arg.seq_args,
1484                                 &data->o_res.seq_res,
1485                                 task) != 0)
1486                 nfs_release_seqid(data->o_arg.seqid);
1487         else
1488                 rpc_call_start(task);
1489         return;
1490 unlock_no_action:
1491         rcu_read_unlock();
1492 out_no_action:
1493         task->tk_action = NULL;
1494
1495 }
1496
1497 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1498 {
1499         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1500         nfs4_open_prepare(task, calldata);
1501 }
1502
1503 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1504 {
1505         struct nfs4_opendata *data = calldata;
1506
1507         data->rpc_status = task->tk_status;
1508
1509         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1510                 return;
1511
1512         if (task->tk_status == 0) {
1513                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1514                         switch (data->o_res.f_attr->mode & S_IFMT) {
1515                         case S_IFREG:
1516                                 break;
1517                         case S_IFLNK:
1518                                 data->rpc_status = -ELOOP;
1519                                 break;
1520                         case S_IFDIR:
1521                                 data->rpc_status = -EISDIR;
1522                                 break;
1523                         default:
1524                                 data->rpc_status = -ENOTDIR;
1525                         }
1526                 }
1527                 renew_lease(data->o_res.server, data->timestamp);
1528                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1529                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1530         }
1531         data->rpc_done = 1;
1532 }
1533
1534 static void nfs4_open_release(void *calldata)
1535 {
1536         struct nfs4_opendata *data = calldata;
1537         struct nfs4_state *state = NULL;
1538
1539         /* If this request hasn't been cancelled, do nothing */
1540         if (data->cancelled == 0)
1541                 goto out_free;
1542         /* In case of error, no cleanup! */
1543         if (data->rpc_status != 0 || !data->rpc_done)
1544                 goto out_free;
1545         /* In case we need an open_confirm, no cleanup! */
1546         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1547                 goto out_free;
1548         state = nfs4_opendata_to_nfs4_state(data);
1549         if (!IS_ERR(state))
1550                 nfs4_close_state(state, data->o_arg.fmode);
1551 out_free:
1552         nfs4_opendata_put(data);
1553 }
1554
1555 static const struct rpc_call_ops nfs4_open_ops = {
1556         .rpc_call_prepare = nfs4_open_prepare,
1557         .rpc_call_done = nfs4_open_done,
1558         .rpc_release = nfs4_open_release,
1559 };
1560
1561 static const struct rpc_call_ops nfs4_recover_open_ops = {
1562         .rpc_call_prepare = nfs4_recover_open_prepare,
1563         .rpc_call_done = nfs4_open_done,
1564         .rpc_release = nfs4_open_release,
1565 };
1566
1567 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1568 {
1569         struct inode *dir = data->dir->d_inode;
1570         struct nfs_server *server = NFS_SERVER(dir);
1571         struct nfs_openargs *o_arg = &data->o_arg;
1572         struct nfs_openres *o_res = &data->o_res;
1573         struct rpc_task *task;
1574         struct rpc_message msg = {
1575                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1576                 .rpc_argp = o_arg,
1577                 .rpc_resp = o_res,
1578                 .rpc_cred = data->owner->so_cred,
1579         };
1580         struct rpc_task_setup task_setup_data = {
1581                 .rpc_client = server->client,
1582                 .rpc_message = &msg,
1583                 .callback_ops = &nfs4_open_ops,
1584                 .callback_data = data,
1585                 .workqueue = nfsiod_workqueue,
1586                 .flags = RPC_TASK_ASYNC,
1587         };
1588         int status;
1589
1590         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1591         kref_get(&data->kref);
1592         data->rpc_done = 0;
1593         data->rpc_status = 0;
1594         data->cancelled = 0;
1595         if (isrecover)
1596                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1597         task = rpc_run_task(&task_setup_data);
1598         if (IS_ERR(task))
1599                 return PTR_ERR(task);
1600         status = nfs4_wait_for_completion_rpc_task(task);
1601         if (status != 0) {
1602                 data->cancelled = 1;
1603                 smp_wmb();
1604         } else
1605                 status = data->rpc_status;
1606         rpc_put_task(task);
1607
1608         return status;
1609 }
1610
1611 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1612 {
1613         struct inode *dir = data->dir->d_inode;
1614         struct nfs_openres *o_res = &data->o_res;
1615         int status;
1616
1617         status = nfs4_run_open_task(data, 1);
1618         if (status != 0 || !data->rpc_done)
1619                 return status;
1620
1621         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1622
1623         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1624                 status = _nfs4_proc_open_confirm(data);
1625                 if (status != 0)
1626                         return status;
1627         }
1628
1629         return status;
1630 }
1631
1632 static int nfs4_opendata_access(struct rpc_cred *cred,
1633                                 struct nfs4_opendata *opendata,
1634                                 struct nfs4_state *state, fmode_t fmode)
1635 {
1636         struct nfs_access_entry cache;
1637         u32 mask;
1638
1639         /* access call failed or for some reason the server doesn't
1640          * support any access modes -- defer access call until later */
1641         if (opendata->o_res.access_supported == 0)
1642                 return 0;
1643
1644         mask = 0;
1645         /* don't check MAY_WRITE - a newly created file may not have
1646          * write mode bits, but POSIX allows the creating process to write */
1647         if (fmode & FMODE_READ)
1648                 mask |= MAY_READ;
1649         if (fmode & FMODE_EXEC)
1650                 mask |= MAY_EXEC;
1651
1652         cache.cred = cred;
1653         cache.jiffies = jiffies;
1654         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1655         nfs_access_add_cache(state->inode, &cache);
1656
1657         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1658                 return 0;
1659
1660         /* even though OPEN succeeded, access is denied. Close the file */
1661         nfs4_close_state(state, fmode);
1662         return -EACCES;
1663 }
1664
1665 /*
1666  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1667  */
1668 static int _nfs4_proc_open(struct nfs4_opendata *data)
1669 {
1670         struct inode *dir = data->dir->d_inode;
1671         struct nfs_server *server = NFS_SERVER(dir);
1672         struct nfs_openargs *o_arg = &data->o_arg;
1673         struct nfs_openres *o_res = &data->o_res;
1674         int status;
1675
1676         status = nfs4_run_open_task(data, 0);
1677         if (!data->rpc_done)
1678                 return status;
1679         if (status != 0) {
1680                 if (status == -NFS4ERR_BADNAME &&
1681                                 !(o_arg->open_flags & O_CREAT))
1682                         return -ENOENT;
1683                 return status;
1684         }
1685
1686         nfs_fattr_map_and_free_names(server, &data->f_attr);
1687
1688         if (o_arg->open_flags & O_CREAT)
1689                 update_changeattr(dir, &o_res->cinfo);
1690         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1691                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1692         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1693                 status = _nfs4_proc_open_confirm(data);
1694                 if (status != 0)
1695                         return status;
1696         }
1697         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1698                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1699         return 0;
1700 }
1701
1702 static int nfs4_recover_expired_lease(struct nfs_server *server)
1703 {
1704         return nfs4_client_recover_expired_lease(server->nfs_client);
1705 }
1706
1707 /*
1708  * OPEN_EXPIRED:
1709  *      reclaim state on the server after a network partition.
1710  *      Assumes caller holds the appropriate lock
1711  */
1712 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1713 {
1714         struct nfs4_opendata *opendata;
1715         int ret;
1716
1717         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1718         if (IS_ERR(opendata))
1719                 return PTR_ERR(opendata);
1720         ret = nfs4_open_recover(opendata, state);
1721         if (ret == -ESTALE)
1722                 d_drop(ctx->dentry);
1723         nfs4_opendata_put(opendata);
1724         return ret;
1725 }
1726
1727 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1728 {
1729         struct nfs_server *server = NFS_SERVER(state->inode);
1730         struct nfs4_exception exception = { };
1731         int err;
1732
1733         do {
1734                 err = _nfs4_open_expired(ctx, state);
1735                 switch (err) {
1736                 default:
1737                         goto out;
1738                 case -NFS4ERR_GRACE:
1739                 case -NFS4ERR_DELAY:
1740                         nfs4_handle_exception(server, err, &exception);
1741                         err = 0;
1742                 }
1743         } while (exception.retry);
1744 out:
1745         return err;
1746 }
1747
1748 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1749 {
1750         struct nfs_open_context *ctx;
1751         int ret;
1752
1753         ctx = nfs4_state_find_open_context(state);
1754         if (IS_ERR(ctx))
1755                 return PTR_ERR(ctx);
1756         ret = nfs4_do_open_expired(ctx, state);
1757         put_nfs_open_context(ctx);
1758         return ret;
1759 }
1760
1761 #if defined(CONFIG_NFS_V4_1)
1762 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1763 {
1764         struct nfs_server *server = NFS_SERVER(state->inode);
1765         nfs4_stateid *stateid = &state->stateid;
1766         int status;
1767
1768         /* If a state reset has been done, test_stateid is unneeded */
1769         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1770                 return;
1771
1772         status = nfs41_test_stateid(server, stateid);
1773         if (status != NFS_OK) {
1774                 /* Free the stateid unless the server explicitly
1775                  * informs us the stateid is unrecognized. */
1776                 if (status != -NFS4ERR_BAD_STATEID)
1777                         nfs41_free_stateid(server, stateid);
1778                 nfs_remove_bad_delegation(state->inode);
1779
1780                 write_seqlock(&state->seqlock);
1781                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1782                 write_sequnlock(&state->seqlock);
1783                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1784         }
1785 }
1786
1787 /**
1788  * nfs41_check_open_stateid - possibly free an open stateid
1789  *
1790  * @state: NFSv4 state for an inode
1791  *
1792  * Returns NFS_OK if recovery for this stateid is now finished.
1793  * Otherwise a negative NFS4ERR value is returned.
1794  */
1795 static int nfs41_check_open_stateid(struct nfs4_state *state)
1796 {
1797         struct nfs_server *server = NFS_SERVER(state->inode);
1798         nfs4_stateid *stateid = &state->open_stateid;
1799         int status;
1800
1801         /* If a state reset has been done, test_stateid is unneeded */
1802         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1803             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1804             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1805                 return -NFS4ERR_BAD_STATEID;
1806
1807         status = nfs41_test_stateid(server, stateid);
1808         if (status != NFS_OK) {
1809                 /* Free the stateid unless the server explicitly
1810                  * informs us the stateid is unrecognized. */
1811                 if (status != -NFS4ERR_BAD_STATEID)
1812                         nfs41_free_stateid(server, stateid);
1813
1814                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1815                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1816                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1817         }
1818         return status;
1819 }
1820
1821 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1822 {
1823         int status;
1824
1825         nfs41_clear_delegation_stateid(state);
1826         status = nfs41_check_open_stateid(state);
1827         if (status != NFS_OK)
1828                 status = nfs4_open_expired(sp, state);
1829         return status;
1830 }
1831 #endif
1832
1833 /*
1834  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1835  * fields corresponding to attributes that were used to store the verifier.
1836  * Make sure we clobber those fields in the later setattr call
1837  */
1838 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1839 {
1840         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1841             !(sattr->ia_valid & ATTR_ATIME_SET))
1842                 sattr->ia_valid |= ATTR_ATIME;
1843
1844         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1845             !(sattr->ia_valid & ATTR_MTIME_SET))
1846                 sattr->ia_valid |= ATTR_MTIME;
1847 }
1848
1849 /*
1850  * Returns a referenced nfs4_state
1851  */
1852 static int _nfs4_do_open(struct inode *dir,
1853                         struct dentry *dentry,
1854                         fmode_t fmode,
1855                         int flags,
1856                         struct iattr *sattr,
1857                         struct rpc_cred *cred,
1858                         struct nfs4_state **res,
1859                         struct nfs4_threshold **ctx_th)
1860 {
1861         struct nfs4_state_owner  *sp;
1862         struct nfs4_state     *state = NULL;
1863         struct nfs_server       *server = NFS_SERVER(dir);
1864         struct nfs4_opendata *opendata;
1865         int status;
1866
1867         /* Protect against reboot recovery conflicts */
1868         status = -ENOMEM;
1869         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1870         if (sp == NULL) {
1871                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1872                 goto out_err;
1873         }
1874         status = nfs4_recover_expired_lease(server);
1875         if (status != 0)
1876                 goto err_put_state_owner;
1877         if (dentry->d_inode != NULL)
1878                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1879         status = -ENOMEM;
1880         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1881         if (opendata == NULL)
1882                 goto err_put_state_owner;
1883
1884         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1885                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1886                 if (!opendata->f_attr.mdsthreshold)
1887                         goto err_opendata_put;
1888                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1889         }
1890         if (dentry->d_inode != NULL)
1891                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1892
1893         status = _nfs4_proc_open(opendata);
1894         if (status != 0)
1895                 goto err_opendata_put;
1896
1897         state = nfs4_opendata_to_nfs4_state(opendata);
1898         status = PTR_ERR(state);
1899         if (IS_ERR(state))
1900                 goto err_opendata_put;
1901         if (server->caps & NFS_CAP_POSIX_LOCK)
1902                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1903
1904         status = nfs4_opendata_access(cred, opendata, state, fmode);
1905         if (status != 0)
1906                 goto err_opendata_put;
1907
1908         if (opendata->o_arg.open_flags & O_EXCL) {
1909                 nfs4_exclusive_attrset(opendata, sattr);
1910
1911                 nfs_fattr_init(opendata->o_res.f_attr);
1912                 status = nfs4_do_setattr(state->inode, cred,
1913                                 opendata->o_res.f_attr, sattr,
1914                                 state);
1915                 if (status == 0)
1916                         nfs_setattr_update_inode(state->inode, sattr);
1917                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1918         }
1919
1920         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1921                 *ctx_th = opendata->f_attr.mdsthreshold;
1922         else
1923                 kfree(opendata->f_attr.mdsthreshold);
1924         opendata->f_attr.mdsthreshold = NULL;
1925
1926         nfs4_opendata_put(opendata);
1927         nfs4_put_state_owner(sp);
1928         *res = state;
1929         return 0;
1930 err_opendata_put:
1931         kfree(opendata->f_attr.mdsthreshold);
1932         nfs4_opendata_put(opendata);
1933 err_put_state_owner:
1934         nfs4_put_state_owner(sp);
1935 out_err:
1936         *res = NULL;
1937         return status;
1938 }
1939
1940
1941 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1942                                         struct dentry *dentry,
1943                                         fmode_t fmode,
1944                                         int flags,
1945                                         struct iattr *sattr,
1946                                         struct rpc_cred *cred,
1947                                         struct nfs4_threshold **ctx_th)
1948 {
1949         struct nfs4_exception exception = { };
1950         struct nfs4_state *res;
1951         int status;
1952
1953         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1954         do {
1955                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1956                                        &res, ctx_th);
1957                 if (status == 0)
1958                         break;
1959                 /* NOTE: BAD_SEQID means the server and client disagree about the
1960                  * book-keeping w.r.t. state-changing operations
1961                  * (OPEN/CLOSE/LOCK/LOCKU...)
1962                  * It is actually a sign of a bug on the client or on the server.
1963                  *
1964                  * If we receive a BAD_SEQID error in the particular case of
1965                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1966                  * have unhashed the old state_owner for us, and that we can
1967                  * therefore safely retry using a new one. We should still warn
1968                  * the user though...
1969                  */
1970                 if (status == -NFS4ERR_BAD_SEQID) {
1971                         pr_warn_ratelimited("NFS: v4 server %s "
1972                                         " returned a bad sequence-id error!\n",
1973                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1974                         exception.retry = 1;
1975                         continue;
1976                 }
1977                 /*
1978                  * BAD_STATEID on OPEN means that the server cancelled our
1979                  * state before it received the OPEN_CONFIRM.
1980                  * Recover by retrying the request as per the discussion
1981                  * on Page 181 of RFC3530.
1982                  */
1983                 if (status == -NFS4ERR_BAD_STATEID) {
1984                         exception.retry = 1;
1985                         continue;
1986                 }
1987                 if (status == -EAGAIN) {
1988                         /* We must have found a delegation */
1989                         exception.retry = 1;
1990                         continue;
1991                 }
1992                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1993                                         status, &exception));
1994         } while (exception.retry);
1995         return res;
1996 }
1997
1998 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1999                             struct nfs_fattr *fattr, struct iattr *sattr,
2000                             struct nfs4_state *state)
2001 {
2002         struct nfs_server *server = NFS_SERVER(inode);
2003         struct nfs_setattrargs  arg = {
2004                 .fh             = NFS_FH(inode),
2005                 .iap            = sattr,
2006                 .server         = server,
2007                 .bitmask = server->attr_bitmask,
2008         };
2009         struct nfs_setattrres  res = {
2010                 .fattr          = fattr,
2011                 .server         = server,
2012         };
2013         struct rpc_message msg = {
2014                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2015                 .rpc_argp       = &arg,
2016                 .rpc_resp       = &res,
2017                 .rpc_cred       = cred,
2018         };
2019         unsigned long timestamp = jiffies;
2020         int status;
2021
2022         nfs_fattr_init(fattr);
2023
2024         if (state != NULL) {
2025                 struct nfs_lockowner lockowner = {
2026                         .l_owner = current->files,
2027                         .l_pid = current->tgid,
2028                 };
2029                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2030                                 &lockowner);
2031         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2032                                 FMODE_WRITE)) {
2033                 /* Use that stateid */
2034         } else
2035                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2036
2037         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2038         if (status == 0 && state != NULL)
2039                 renew_lease(server, timestamp);
2040         return status;
2041 }
2042
2043 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2044                            struct nfs_fattr *fattr, struct iattr *sattr,
2045                            struct nfs4_state *state)
2046 {
2047         struct nfs_server *server = NFS_SERVER(inode);
2048         struct nfs4_exception exception = {
2049                 .state = state,
2050                 .inode = inode,
2051         };
2052         int err;
2053         do {
2054                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2055                 switch (err) {
2056                 case -NFS4ERR_OPENMODE:
2057                         if (state && !(state->state & FMODE_WRITE)) {
2058                                 err = -EBADF;
2059                                 if (sattr->ia_valid & ATTR_OPEN)
2060                                         err = -EACCES;
2061                                 goto out;
2062                         }
2063                 }
2064                 err = nfs4_handle_exception(server, err, &exception);
2065         } while (exception.retry);
2066 out:
2067         return err;
2068 }
2069
2070 struct nfs4_closedata {
2071         struct inode *inode;
2072         struct nfs4_state *state;
2073         struct nfs_closeargs arg;
2074         struct nfs_closeres res;
2075         struct nfs_fattr fattr;
2076         unsigned long timestamp;
2077         bool roc;
2078         u32 roc_barrier;
2079 };
2080
2081 static void nfs4_free_closedata(void *data)
2082 {
2083         struct nfs4_closedata *calldata = data;
2084         struct nfs4_state_owner *sp = calldata->state->owner;
2085         struct super_block *sb = calldata->state->inode->i_sb;
2086
2087         if (calldata->roc)
2088                 pnfs_roc_release(calldata->state->inode);
2089         nfs4_put_open_state(calldata->state);
2090         nfs_free_seqid(calldata->arg.seqid);
2091         nfs4_put_state_owner(sp);
2092         nfs_sb_deactive_async(sb);
2093         kfree(calldata);
2094 }
2095
2096 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2097                 fmode_t fmode)
2098 {
2099         spin_lock(&state->owner->so_lock);
2100         if (!(fmode & FMODE_READ))
2101                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2102         if (!(fmode & FMODE_WRITE))
2103                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2104         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2105         spin_unlock(&state->owner->so_lock);
2106 }
2107
2108 static void nfs4_close_done(struct rpc_task *task, void *data)
2109 {
2110         struct nfs4_closedata *calldata = data;
2111         struct nfs4_state *state = calldata->state;
2112         struct nfs_server *server = NFS_SERVER(calldata->inode);
2113
2114         dprintk("%s: begin!\n", __func__);
2115         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2116                 return;
2117         /* hmm. we are done with the inode, and in the process of freeing
2118          * the state_owner. we keep this around to process errors
2119          */
2120         switch (task->tk_status) {
2121                 case 0:
2122                         if (calldata->roc)
2123                                 pnfs_roc_set_barrier(state->inode,
2124                                                      calldata->roc_barrier);
2125                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2126                         renew_lease(server, calldata->timestamp);
2127                         nfs4_close_clear_stateid_flags(state,
2128                                         calldata->arg.fmode);
2129                         break;
2130                 case -NFS4ERR_STALE_STATEID:
2131                 case -NFS4ERR_OLD_STATEID:
2132                 case -NFS4ERR_BAD_STATEID:
2133                 case -NFS4ERR_EXPIRED:
2134                         if (calldata->arg.fmode == 0)
2135                                 break;
2136                 default:
2137                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2138                                 rpc_restart_call_prepare(task);
2139         }
2140         nfs_release_seqid(calldata->arg.seqid);
2141         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2142         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2143 }
2144
2145 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2146 {
2147         struct nfs4_closedata *calldata = data;
2148         struct nfs4_state *state = calldata->state;
2149         struct inode *inode = calldata->inode;
2150         int call_close = 0;
2151
2152         dprintk("%s: begin!\n", __func__);
2153         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2154                 return;
2155
2156         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2157         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2158         spin_lock(&state->owner->so_lock);
2159         /* Calculate the change in open mode */
2160         if (state->n_rdwr == 0) {
2161                 if (state->n_rdonly == 0) {
2162                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2163                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2164                         calldata->arg.fmode &= ~FMODE_READ;
2165                 }
2166                 if (state->n_wronly == 0) {
2167                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2168                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2169                         calldata->arg.fmode &= ~FMODE_WRITE;
2170                 }
2171         }
2172         spin_unlock(&state->owner->so_lock);
2173
2174         if (!call_close) {
2175                 /* Note: exit _without_ calling nfs4_close_done */
2176                 task->tk_action = NULL;
2177                 goto out;
2178         }
2179
2180         if (calldata->arg.fmode == 0) {
2181                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2182                 if (calldata->roc &&
2183                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2184                         goto out;
2185         }
2186
2187         nfs_fattr_init(calldata->res.fattr);
2188         calldata->timestamp = jiffies;
2189         if (nfs4_setup_sequence(NFS_SERVER(inode),
2190                                 &calldata->arg.seq_args,
2191                                 &calldata->res.seq_res,
2192                                 task) != 0)
2193                 nfs_release_seqid(calldata->arg.seqid);
2194         else
2195                 rpc_call_start(task);
2196 out:
2197         dprintk("%s: done!\n", __func__);
2198 }
2199
2200 static const struct rpc_call_ops nfs4_close_ops = {
2201         .rpc_call_prepare = nfs4_close_prepare,
2202         .rpc_call_done = nfs4_close_done,
2203         .rpc_release = nfs4_free_closedata,
2204 };
2205
2206 /*
2207  * It is possible for data to be read/written from a mem-mapped file
2208  * after the sys_close call (which hits the vfs layer as a flush).
2209  * This means that we can't safely call nfsv4 close on a file until
2210  * the inode is cleared. This in turn means that we are not good
2211  * NFSv4 citizens - we do not indicate to the server to update the file's
2212  * share state even when we are done with one of the three share
2213  * stateid's in the inode.
2214  *
2215  * NOTE: Caller must be holding the sp->so_owner semaphore!
2216  */
2217 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2218 {
2219         struct nfs_server *server = NFS_SERVER(state->inode);
2220         struct nfs4_closedata *calldata;
2221         struct nfs4_state_owner *sp = state->owner;
2222         struct rpc_task *task;
2223         struct rpc_message msg = {
2224                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2225                 .rpc_cred = state->owner->so_cred,
2226         };
2227         struct rpc_task_setup task_setup_data = {
2228                 .rpc_client = server->client,
2229                 .rpc_message = &msg,
2230                 .callback_ops = &nfs4_close_ops,
2231                 .workqueue = nfsiod_workqueue,
2232                 .flags = RPC_TASK_ASYNC,
2233         };
2234         int status = -ENOMEM;
2235
2236         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2237         if (calldata == NULL)
2238                 goto out;
2239         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2240         calldata->inode = state->inode;
2241         calldata->state = state;
2242         calldata->arg.fh = NFS_FH(state->inode);
2243         calldata->arg.stateid = &state->open_stateid;
2244         /* Serialization for the sequence id */
2245         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2246         if (calldata->arg.seqid == NULL)
2247                 goto out_free_calldata;
2248         calldata->arg.fmode = 0;
2249         calldata->arg.bitmask = server->cache_consistency_bitmask;
2250         calldata->res.fattr = &calldata->fattr;
2251         calldata->res.seqid = calldata->arg.seqid;
2252         calldata->res.server = server;
2253         calldata->roc = pnfs_roc(state->inode);
2254         nfs_sb_active(calldata->inode->i_sb);
2255
2256         msg.rpc_argp = &calldata->arg;
2257         msg.rpc_resp = &calldata->res;
2258         task_setup_data.callback_data = calldata;
2259         task = rpc_run_task(&task_setup_data);
2260         if (IS_ERR(task))
2261                 return PTR_ERR(task);
2262         status = 0;
2263         if (wait)
2264                 status = rpc_wait_for_completion_task(task);
2265         rpc_put_task(task);
2266         return status;
2267 out_free_calldata:
2268         kfree(calldata);
2269 out:
2270         nfs4_put_open_state(state);
2271         nfs4_put_state_owner(sp);
2272         return status;
2273 }
2274
2275 static struct inode *
2276 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2277 {
2278         struct nfs4_state *state;
2279
2280         /* Protect against concurrent sillydeletes */
2281         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2282                              ctx->cred, &ctx->mdsthreshold);
2283         if (IS_ERR(state))
2284                 return ERR_CAST(state);
2285         ctx->state = state;
2286         return igrab(state->inode);
2287 }
2288
2289 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2290 {
2291         if (ctx->state == NULL)
2292                 return;
2293         if (is_sync)
2294                 nfs4_close_sync(ctx->state, ctx->mode);
2295         else
2296                 nfs4_close_state(ctx->state, ctx->mode);
2297 }
2298
2299 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2300 {
2301         struct nfs4_server_caps_arg args = {
2302                 .fhandle = fhandle,
2303         };
2304         struct nfs4_server_caps_res res = {};
2305         struct rpc_message msg = {
2306                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2307                 .rpc_argp = &args,
2308                 .rpc_resp = &res,
2309         };
2310         int status;
2311
2312         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2313         if (status == 0) {
2314                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2315                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2316                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2317                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2318                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2319                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2320                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2321                         server->caps |= NFS_CAP_ACLS;
2322                 if (res.has_links != 0)
2323                         server->caps |= NFS_CAP_HARDLINKS;
2324                 if (res.has_symlinks != 0)
2325                         server->caps |= NFS_CAP_SYMLINKS;
2326                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2327                         server->caps |= NFS_CAP_FILEID;
2328                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2329                         server->caps |= NFS_CAP_MODE;
2330                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2331                         server->caps |= NFS_CAP_NLINK;
2332                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2333                         server->caps |= NFS_CAP_OWNER;
2334                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2335                         server->caps |= NFS_CAP_OWNER_GROUP;
2336                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2337                         server->caps |= NFS_CAP_ATIME;
2338                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2339                         server->caps |= NFS_CAP_CTIME;
2340                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2341                         server->caps |= NFS_CAP_MTIME;
2342
2343                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2344                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2345                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2346                 server->acl_bitmask = res.acl_bitmask;
2347                 server->fh_expire_type = res.fh_expire_type;
2348         }
2349
2350         return status;
2351 }
2352
2353 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2354 {
2355         struct nfs4_exception exception = { };
2356         int err;
2357         do {
2358                 err = nfs4_handle_exception(server,
2359                                 _nfs4_server_capabilities(server, fhandle),
2360                                 &exception);
2361         } while (exception.retry);
2362         return err;
2363 }
2364
2365 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2366                 struct nfs_fsinfo *info)
2367 {
2368         struct nfs4_lookup_root_arg args = {
2369                 .bitmask = nfs4_fattr_bitmap,
2370         };
2371         struct nfs4_lookup_res res = {
2372                 .server = server,
2373                 .fattr = info->fattr,
2374                 .fh = fhandle,
2375         };
2376         struct rpc_message msg = {
2377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2378                 .rpc_argp = &args,
2379                 .rpc_resp = &res,
2380         };
2381
2382         nfs_fattr_init(info->fattr);
2383         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2384 }
2385
2386 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2387                 struct nfs_fsinfo *info)
2388 {
2389         struct nfs4_exception exception = { };
2390         int err;
2391         do {
2392                 err = _nfs4_lookup_root(server, fhandle, info);
2393                 switch (err) {
2394                 case 0:
2395                 case -NFS4ERR_WRONGSEC:
2396                         goto out;
2397                 default:
2398                         err = nfs4_handle_exception(server, err, &exception);
2399                 }
2400         } while (exception.retry);
2401 out:
2402         return err;
2403 }
2404
2405 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2406                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2407 {
2408         struct rpc_auth *auth;
2409         int ret;
2410
2411         auth = rpcauth_create(flavor, server->client);
2412         if (IS_ERR(auth)) {
2413                 ret = -EIO;
2414                 goto out;
2415         }
2416         ret = nfs4_lookup_root(server, fhandle, info);
2417 out:
2418         return ret;
2419 }
2420
2421 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2422                               struct nfs_fsinfo *info)
2423 {
2424         int i, len, status = 0;
2425         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2426
2427         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2428         if (len < 0)
2429                 return len;
2430
2431         for (i = 0; i < len; i++) {
2432                 /* AUTH_UNIX is the default flavor if none was specified,
2433                  * thus has already been tried. */
2434                 if (flav_array[i] == RPC_AUTH_UNIX)
2435                         continue;
2436
2437                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2438                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2439                         continue;
2440                 break;
2441         }
2442         /*
2443          * -EACCESS could mean that the user doesn't have correct permissions
2444          * to access the mount.  It could also mean that we tried to mount
2445          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2446          * existing mount programs don't handle -EACCES very well so it should
2447          * be mapped to -EPERM instead.
2448          */
2449         if (status == -EACCES)
2450                 status = -EPERM;
2451         return status;
2452 }
2453
2454 /*
2455  * get the file handle for the "/" directory on the server
2456  */
2457 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2458                          struct nfs_fsinfo *info)
2459 {
2460         int minor_version = server->nfs_client->cl_minorversion;
2461         int status = nfs4_lookup_root(server, fhandle, info);
2462         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2463                 /*
2464                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2465                  * by nfs4_map_errors() as this function exits.
2466                  */
2467                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2468         if (status == 0)
2469                 status = nfs4_server_capabilities(server, fhandle);
2470         if (status == 0)
2471                 status = nfs4_do_fsinfo(server, fhandle, info);
2472         return nfs4_map_errors(status);
2473 }
2474
2475 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2476                               struct nfs_fsinfo *info)
2477 {
2478         int error;
2479         struct nfs_fattr *fattr = info->fattr;
2480
2481         error = nfs4_server_capabilities(server, mntfh);
2482         if (error < 0) {
2483                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2484                 return error;
2485         }
2486
2487         error = nfs4_proc_getattr(server, mntfh, fattr);
2488         if (error < 0) {
2489                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2490                 return error;
2491         }
2492
2493         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2494             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2495                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2496
2497         return error;
2498 }
2499
2500 /*
2501  * Get locations and (maybe) other attributes of a referral.
2502  * Note that we'll actually follow the referral later when
2503  * we detect fsid mismatch in inode revalidation
2504  */
2505 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2506                              const struct qstr *name, struct nfs_fattr *fattr,
2507                              struct nfs_fh *fhandle)
2508 {
2509         int status = -ENOMEM;
2510         struct page *page = NULL;
2511         struct nfs4_fs_locations *locations = NULL;
2512
2513         page = alloc_page(GFP_KERNEL);
2514         if (page == NULL)
2515                 goto out;
2516         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2517         if (locations == NULL)
2518                 goto out;
2519
2520         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2521         if (status != 0)
2522                 goto out;
2523         /* Make sure server returned a different fsid for the referral */
2524         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2525                 dprintk("%s: server did not return a different fsid for"
2526                         " a referral at %s\n", __func__, name->name);
2527                 status = -EIO;
2528                 goto out;
2529         }
2530         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2531         nfs_fixup_referral_attributes(&locations->fattr);
2532
2533         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2534         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2535         memset(fhandle, 0, sizeof(struct nfs_fh));
2536 out:
2537         if (page)
2538                 __free_page(page);
2539         kfree(locations);
2540         return status;
2541 }
2542
2543 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2544 {
2545         struct nfs4_getattr_arg args = {
2546                 .fh = fhandle,
2547                 .bitmask = server->attr_bitmask,
2548         };
2549         struct nfs4_getattr_res res = {
2550                 .fattr = fattr,
2551                 .server = server,
2552         };
2553         struct rpc_message msg = {
2554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2555                 .rpc_argp = &args,
2556                 .rpc_resp = &res,
2557         };
2558
2559         nfs_fattr_init(fattr);
2560         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2561 }
2562
2563 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2564 {
2565         struct nfs4_exception exception = { };
2566         int err;
2567         do {
2568                 err = nfs4_handle_exception(server,
2569                                 _nfs4_proc_getattr(server, fhandle, fattr),
2570                                 &exception);
2571         } while (exception.retry);
2572         return err;
2573 }
2574
2575 /*
2576  * The file is not closed if it is opened due to the a request to change
2577  * the size of the file. The open call will not be needed once the
2578  * VFS layer lookup-intents are implemented.
2579  *
2580  * Close is called when the inode is destroyed.
2581  * If we haven't opened the file for O_WRONLY, we
2582  * need to in the size_change case to obtain a stateid.
2583  *
2584  * Got race?
2585  * Because OPEN is always done by name in nfsv4, it is
2586  * possible that we opened a different file by the same
2587  * name.  We can recognize this race condition, but we
2588  * can't do anything about it besides returning an error.
2589  *
2590  * This will be fixed with VFS changes (lookup-intent).
2591  */
2592 static int
2593 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2594                   struct iattr *sattr)
2595 {
2596         struct inode *inode = dentry->d_inode;
2597         struct rpc_cred *cred = NULL;
2598         struct nfs4_state *state = NULL;
2599         int status;
2600
2601         if (pnfs_ld_layoutret_on_setattr(inode))
2602                 pnfs_return_layout(inode);
2603
2604         nfs_fattr_init(fattr);
2605
2606         /* Deal with open(O_TRUNC) */
2607         if (sattr->ia_valid & ATTR_OPEN)
2608                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2609
2610         /* Optimization: if the end result is no change, don't RPC */
2611         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2612                 return 0;
2613
2614         /* Search for an existing open(O_WRITE) file */
2615         if (sattr->ia_valid & ATTR_FILE) {
2616                 struct nfs_open_context *ctx;
2617
2618                 ctx = nfs_file_open_context(sattr->ia_file);
2619                 if (ctx) {
2620                         cred = ctx->cred;
2621                         state = ctx->state;
2622                 }
2623         }
2624
2625         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2626         if (status == 0)
2627                 nfs_setattr_update_inode(inode, sattr);
2628         return status;
2629 }
2630
2631 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2632                 const struct qstr *name, struct nfs_fh *fhandle,
2633                 struct nfs_fattr *fattr)
2634 {
2635         struct nfs_server *server = NFS_SERVER(dir);
2636         int                    status;
2637         struct nfs4_lookup_arg args = {
2638                 .bitmask = server->attr_bitmask,
2639                 .dir_fh = NFS_FH(dir),
2640                 .name = name,
2641         };
2642         struct nfs4_lookup_res res = {
2643                 .server = server,
2644                 .fattr = fattr,
2645                 .fh = fhandle,
2646         };
2647         struct rpc_message msg = {
2648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2649                 .rpc_argp = &args,
2650                 .rpc_resp = &res,
2651         };
2652
2653         nfs_fattr_init(fattr);
2654
2655         dprintk("NFS call  lookup %s\n", name->name);
2656         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2657         dprintk("NFS reply lookup: %d\n", status);
2658         return status;
2659 }
2660
2661 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2662 {
2663         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2664                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2665         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2666         fattr->nlink = 2;
2667 }
2668
2669 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2670                                    struct qstr *name, struct nfs_fh *fhandle,
2671                                    struct nfs_fattr *fattr)
2672 {
2673         struct nfs4_exception exception = { };
2674         struct rpc_clnt *client = *clnt;
2675         int err;
2676         do {
2677                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2678                 switch (err) {
2679                 case -NFS4ERR_BADNAME:
2680                         err = -ENOENT;
2681                         goto out;
2682                 case -NFS4ERR_MOVED:
2683                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2684                         goto out;
2685                 case -NFS4ERR_WRONGSEC:
2686                         err = -EPERM;
2687                         if (client != *clnt)
2688                                 goto out;
2689
2690                         client = nfs4_create_sec_client(client, dir, name);
2691                         if (IS_ERR(client))
2692                                 return PTR_ERR(client);
2693
2694                         exception.retry = 1;
2695                         break;
2696                 default:
2697                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2698                 }
2699         } while (exception.retry);
2700
2701 out:
2702         if (err == 0)
2703                 *clnt = client;
2704         else if (client != *clnt)
2705                 rpc_shutdown_client(client);
2706
2707         return err;
2708 }
2709
2710 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2711                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2712 {
2713         int status;
2714         struct rpc_clnt *client = NFS_CLIENT(dir);
2715
2716         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2717         if (client != NFS_CLIENT(dir)) {
2718                 rpc_shutdown_client(client);
2719                 nfs_fixup_secinfo_attributes(fattr);
2720         }
2721         return status;
2722 }
2723
2724 struct rpc_clnt *
2725 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2726                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2727 {
2728         int status;
2729         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2730
2731         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2732         if (status < 0) {
2733                 rpc_shutdown_client(client);
2734                 return ERR_PTR(status);
2735         }
2736         return client;
2737 }
2738
2739 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2740 {
2741         struct nfs_server *server = NFS_SERVER(inode);
2742         struct nfs4_accessargs args = {
2743                 .fh = NFS_FH(inode),
2744                 .bitmask = server->cache_consistency_bitmask,
2745         };
2746         struct nfs4_accessres res = {
2747                 .server = server,
2748         };
2749         struct rpc_message msg = {
2750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2751                 .rpc_argp = &args,
2752                 .rpc_resp = &res,
2753                 .rpc_cred = entry->cred,
2754         };
2755         int mode = entry->mask;
2756         int status;
2757
2758         /*
2759          * Determine which access bits we want to ask for...
2760          */
2761         if (mode & MAY_READ)
2762                 args.access |= NFS4_ACCESS_READ;
2763         if (S_ISDIR(inode->i_mode)) {
2764                 if (mode & MAY_WRITE)
2765                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2766                 if (mode & MAY_EXEC)
2767                         args.access |= NFS4_ACCESS_LOOKUP;
2768         } else {
2769                 if (mode & MAY_WRITE)
2770                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2771                 if (mode & MAY_EXEC)
2772                         args.access |= NFS4_ACCESS_EXECUTE;
2773         }
2774
2775         res.fattr = nfs_alloc_fattr();
2776         if (res.fattr == NULL)
2777                 return -ENOMEM;
2778
2779         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2780         if (!status) {
2781                 nfs_access_set_mask(entry, res.access);
2782                 nfs_refresh_inode(inode, res.fattr);
2783         }
2784         nfs_free_fattr(res.fattr);
2785         return status;
2786 }
2787
2788 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2789 {
2790         struct nfs4_exception exception = { };
2791         int err;
2792         do {
2793                 err = nfs4_handle_exception(NFS_SERVER(inode),
2794                                 _nfs4_proc_access(inode, entry),
2795                                 &exception);
2796         } while (exception.retry);
2797         return err;
2798 }
2799
2800 /*
2801  * TODO: For the time being, we don't try to get any attributes
2802  * along with any of the zero-copy operations READ, READDIR,
2803  * READLINK, WRITE.
2804  *
2805  * In the case of the first three, we want to put the GETATTR
2806  * after the read-type operation -- this is because it is hard
2807  * to predict the length of a GETATTR response in v4, and thus
2808  * align the READ data correctly.  This means that the GETATTR
2809  * may end up partially falling into the page cache, and we should
2810  * shift it into the 'tail' of the xdr_buf before processing.
2811  * To do this efficiently, we need to know the total length
2812  * of data received, which doesn't seem to be available outside
2813  * of the RPC layer.
2814  *
2815  * In the case of WRITE, we also want to put the GETATTR after
2816  * the operation -- in this case because we want to make sure
2817  * we get the post-operation mtime and size.
2818  *
2819  * Both of these changes to the XDR layer would in fact be quite
2820  * minor, but I decided to leave them for a subsequent patch.
2821  */
2822 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2823                 unsigned int pgbase, unsigned int pglen)
2824 {
2825         struct nfs4_readlink args = {
2826                 .fh       = NFS_FH(inode),
2827                 .pgbase   = pgbase,
2828                 .pglen    = pglen,
2829                 .pages    = &page,
2830         };
2831         struct nfs4_readlink_res res;
2832         struct rpc_message msg = {
2833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2834                 .rpc_argp = &args,
2835                 .rpc_resp = &res,
2836         };
2837
2838         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2839 }
2840
2841 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2842                 unsigned int pgbase, unsigned int pglen)
2843 {
2844         struct nfs4_exception exception = { };
2845         int err;
2846         do {
2847                 err = nfs4_handle_exception(NFS_SERVER(inode),
2848                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2849                                 &exception);
2850         } while (exception.retry);
2851         return err;
2852 }
2853
2854 /*
2855  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2856  */
2857 static int
2858 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2859                  int flags)
2860 {
2861         struct nfs_open_context *ctx;
2862         struct nfs4_state *state;
2863         int status = 0;
2864
2865         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2866         if (IS_ERR(ctx))
2867                 return PTR_ERR(ctx);
2868
2869         sattr->ia_mode &= ~current_umask();
2870         state = nfs4_do_open(dir, dentry, ctx->mode,
2871                         flags, sattr, ctx->cred,
2872                         &ctx->mdsthreshold);
2873         d_drop(dentry);
2874         if (IS_ERR(state)) {
2875                 status = PTR_ERR(state);
2876                 goto out;
2877         }
2878         d_add(dentry, igrab(state->inode));
2879         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2880         ctx->state = state;
2881 out:
2882         put_nfs_open_context(ctx);
2883         return status;
2884 }
2885
2886 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2887 {
2888         struct nfs_server *server = NFS_SERVER(dir);
2889         struct nfs_removeargs args = {
2890                 .fh = NFS_FH(dir),
2891                 .name = *name,
2892         };
2893         struct nfs_removeres res = {
2894                 .server = server,
2895         };
2896         struct rpc_message msg = {
2897                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2898                 .rpc_argp = &args,
2899                 .rpc_resp = &res,
2900         };
2901         int status;
2902
2903         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2904         if (status == 0)
2905                 update_changeattr(dir, &res.cinfo);
2906         return status;
2907 }
2908
2909 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2910 {
2911         struct nfs4_exception exception = { };
2912         int err;
2913         do {
2914                 err = nfs4_handle_exception(NFS_SERVER(dir),
2915                                 _nfs4_proc_remove(dir, name),
2916                                 &exception);
2917         } while (exception.retry);
2918         return err;
2919 }
2920
2921 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2922 {
2923         struct nfs_server *server = NFS_SERVER(dir);
2924         struct nfs_removeargs *args = msg->rpc_argp;
2925         struct nfs_removeres *res = msg->rpc_resp;
2926
2927         res->server = server;
2928         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2929         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2930 }
2931
2932 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2933 {
2934         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2935                                 &data->args.seq_args,
2936                                 &data->res.seq_res,
2937                                 task))
2938                 return;
2939         rpc_call_start(task);
2940 }
2941
2942 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2943 {
2944         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2945
2946         if (!nfs4_sequence_done(task, &res->seq_res))
2947                 return 0;
2948         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2949                 return 0;
2950         update_changeattr(dir, &res->cinfo);
2951         return 1;
2952 }
2953
2954 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2955 {
2956         struct nfs_server *server = NFS_SERVER(dir);
2957         struct nfs_renameargs *arg = msg->rpc_argp;
2958         struct nfs_renameres *res = msg->rpc_resp;
2959
2960         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2961         res->server = server;
2962         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2963 }
2964
2965 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2966 {
2967         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2968                                 &data->args.seq_args,
2969                                 &data->res.seq_res,
2970                                 task))
2971                 return;
2972         rpc_call_start(task);
2973 }
2974
2975 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2976                                  struct inode *new_dir)
2977 {
2978         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2979
2980         if (!nfs4_sequence_done(task, &res->seq_res))
2981                 return 0;
2982         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2983                 return 0;
2984
2985         update_changeattr(old_dir, &res->old_cinfo);
2986         update_changeattr(new_dir, &res->new_cinfo);
2987         return 1;
2988 }
2989
2990 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2991                 struct inode *new_dir, struct qstr *new_name)
2992 {
2993         struct nfs_server *server = NFS_SERVER(old_dir);
2994         struct nfs_renameargs arg = {
2995                 .old_dir = NFS_FH(old_dir),
2996                 .new_dir = NFS_FH(new_dir),
2997                 .old_name = old_name,
2998                 .new_name = new_name,
2999         };
3000         struct nfs_renameres res = {
3001                 .server = server,
3002         };
3003         struct rpc_message msg = {
3004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3005                 .rpc_argp = &arg,
3006                 .rpc_resp = &res,
3007         };
3008         int status = -ENOMEM;
3009
3010         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3011         if (!status) {
3012                 update_changeattr(old_dir, &res.old_cinfo);
3013                 update_changeattr(new_dir, &res.new_cinfo);
3014         }
3015         return status;
3016 }
3017
3018 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3019                 struct inode *new_dir, struct qstr *new_name)
3020 {
3021         struct nfs4_exception exception = { };
3022         int err;
3023         do {
3024                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3025                                 _nfs4_proc_rename(old_dir, old_name,
3026                                         new_dir, new_name),
3027                                 &exception);
3028         } while (exception.retry);
3029         return err;
3030 }
3031
3032 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3033 {
3034         struct nfs_server *server = NFS_SERVER(inode);
3035         struct nfs4_link_arg arg = {
3036                 .fh     = NFS_FH(inode),
3037                 .dir_fh = NFS_FH(dir),
3038                 .name   = name,
3039                 .bitmask = server->attr_bitmask,
3040         };
3041         struct nfs4_link_res res = {
3042                 .server = server,
3043         };
3044         struct rpc_message msg = {
3045                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3046                 .rpc_argp = &arg,
3047                 .rpc_resp = &res,
3048         };
3049         int status = -ENOMEM;
3050
3051         res.fattr = nfs_alloc_fattr();
3052         if (res.fattr == NULL)
3053                 goto out;
3054
3055         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3056         if (!status) {
3057                 update_changeattr(dir, &res.cinfo);
3058                 nfs_post_op_update_inode(inode, res.fattr);
3059         }
3060 out:
3061         nfs_free_fattr(res.fattr);
3062         return status;
3063 }
3064
3065 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3066 {
3067         struct nfs4_exception exception = { };
3068         int err;
3069         do {
3070                 err = nfs4_handle_exception(NFS_SERVER(inode),
3071                                 _nfs4_proc_link(inode, dir, name),
3072                                 &exception);
3073         } while (exception.retry);
3074         return err;
3075 }
3076
3077 struct nfs4_createdata {
3078         struct rpc_message msg;
3079         struct nfs4_create_arg arg;
3080         struct nfs4_create_res res;
3081         struct nfs_fh fh;
3082         struct nfs_fattr fattr;
3083 };
3084
3085 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3086                 struct qstr *name, struct iattr *sattr, u32 ftype)
3087 {
3088         struct nfs4_createdata *data;
3089
3090         data = kzalloc(sizeof(*data), GFP_KERNEL);
3091         if (data != NULL) {
3092                 struct nfs_server *server = NFS_SERVER(dir);
3093
3094                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3095                 data->msg.rpc_argp = &data->arg;
3096                 data->msg.rpc_resp = &data->res;
3097                 data->arg.dir_fh = NFS_FH(dir);
3098                 data->arg.server = server;
3099                 data->arg.name = name;
3100                 data->arg.attrs = sattr;
3101                 data->arg.ftype = ftype;
3102                 data->arg.bitmask = server->attr_bitmask;
3103                 data->res.server = server;
3104                 data->res.fh = &data->fh;
3105                 data->res.fattr = &data->fattr;
3106                 nfs_fattr_init(data->res.fattr);
3107         }
3108         return data;
3109 }
3110
3111 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3112 {
3113         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3114                                     &data->arg.seq_args, &data->res.seq_res, 1);
3115         if (status == 0) {
3116                 update_changeattr(dir, &data->res.dir_cinfo);
3117                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3118         }
3119         return status;
3120 }
3121
3122 static void nfs4_free_createdata(struct nfs4_createdata *data)
3123 {
3124         kfree(data);
3125 }
3126
3127 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3128                 struct page *page, unsigned int len, struct iattr *sattr)
3129 {
3130         struct nfs4_createdata *data;
3131         int status = -ENAMETOOLONG;
3132
3133         if (len > NFS4_MAXPATHLEN)
3134                 goto out;
3135
3136         status = -ENOMEM;
3137         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3138         if (data == NULL)
3139                 goto out;
3140
3141         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3142         data->arg.u.symlink.pages = &page;
3143         data->arg.u.symlink.len = len;
3144
3145         status = nfs4_do_create(dir, dentry, data);
3146
3147         nfs4_free_createdata(data);
3148 out:
3149         return status;
3150 }
3151
3152 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3153                 struct page *page, unsigned int len, struct iattr *sattr)
3154 {
3155         struct nfs4_exception exception = { };
3156         int err;
3157         do {
3158                 err = nfs4_handle_exception(NFS_SERVER(dir),
3159                                 _nfs4_proc_symlink(dir, dentry, page,
3160                                                         len, sattr),
3161                                 &exception);
3162         } while (exception.retry);
3163         return err;
3164 }
3165
3166 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3167                 struct iattr *sattr)
3168 {
3169         struct nfs4_createdata *data;
3170         int status = -ENOMEM;
3171
3172         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3173         if (data == NULL)
3174                 goto out;
3175
3176         status = nfs4_do_create(dir, dentry, data);
3177
3178         nfs4_free_createdata(data);
3179 out:
3180         return status;
3181 }
3182
3183 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3184                 struct iattr *sattr)
3185 {
3186         struct nfs4_exception exception = { };
3187         int err;
3188
3189         sattr->ia_mode &= ~current_umask();
3190         do {
3191                 err = nfs4_handle_exception(NFS_SERVER(dir),
3192                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3193                                 &exception);
3194         } while (exception.retry);
3195         return err;
3196 }
3197
3198 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3199                 u64 cookie, struct page **pages, unsigned int count, int plus)
3200 {
3201         struct inode            *dir = dentry->d_inode;
3202         struct nfs4_readdir_arg args = {
3203                 .fh = NFS_FH(dir),
3204                 .pages = pages,
3205                 .pgbase = 0,
3206                 .count = count,
3207                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3208                 .plus = plus,
3209         };
3210         struct nfs4_readdir_res res;
3211         struct rpc_message msg = {
3212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3213                 .rpc_argp = &args,
3214                 .rpc_resp = &res,
3215                 .rpc_cred = cred,
3216         };
3217         int                     status;
3218
3219         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3220                         dentry->d_parent->d_name.name,
3221                         dentry->d_name.name,
3222                         (unsigned long long)cookie);
3223         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3224         res.pgbase = args.pgbase;
3225         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3226         if (status >= 0) {
3227                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3228                 status += args.pgbase;
3229         }
3230
3231         nfs_invalidate_atime(dir);
3232
3233         dprintk("%s: returns %d\n", __func__, status);
3234         return status;
3235 }
3236
3237 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3238                 u64 cookie, struct page **pages, unsigned int count, int plus)
3239 {
3240         struct nfs4_exception exception = { };
3241         int err;
3242         do {
3243                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3244                                 _nfs4_proc_readdir(dentry, cred, cookie,
3245                                         pages, count, plus),
3246                                 &exception);
3247         } while (exception.retry);
3248         return err;
3249 }
3250
3251 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3252                 struct iattr *sattr, dev_t rdev)
3253 {
3254         struct nfs4_createdata *data;
3255         int mode = sattr->ia_mode;
3256         int status = -ENOMEM;
3257
3258         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3259         if (data == NULL)
3260                 goto out;
3261
3262         if (S_ISFIFO(mode))
3263                 data->arg.ftype = NF4FIFO;
3264         else if (S_ISBLK(mode)) {
3265                 data->arg.ftype = NF4BLK;
3266                 data->arg.u.device.specdata1 = MAJOR(rdev);
3267                 data->arg.u.device.specdata2 = MINOR(rdev);
3268         }
3269         else if (S_ISCHR(mode)) {
3270                 data->arg.ftype = NF4CHR;
3271                 data->arg.u.device.specdata1 = MAJOR(rdev);
3272                 data->arg.u.device.specdata2 = MINOR(rdev);
3273         } else if (!S_ISSOCK(mode)) {
3274                 status = -EINVAL;
3275                 goto out_free;
3276         }
3277
3278         status = nfs4_do_create(dir, dentry, data);
3279 out_free:
3280         nfs4_free_createdata(data);
3281 out:
3282         return status;
3283 }
3284
3285 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3286                 struct iattr *sattr, dev_t rdev)
3287 {
3288         struct nfs4_exception exception = { };
3289         int err;
3290
3291         sattr->ia_mode &= ~current_umask();
3292         do {
3293                 err = nfs4_handle_exception(NFS_SERVER(dir),
3294                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3295                                 &exception);
3296         } while (exception.retry);
3297         return err;
3298 }
3299
3300 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3301                  struct nfs_fsstat *fsstat)
3302 {
3303         struct nfs4_statfs_arg args = {
3304                 .fh = fhandle,
3305                 .bitmask = server->attr_bitmask,
3306         };
3307         struct nfs4_statfs_res res = {
3308                 .fsstat = fsstat,
3309         };
3310         struct rpc_message msg = {
3311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3312                 .rpc_argp = &args,
3313                 .rpc_resp = &res,
3314         };
3315
3316         nfs_fattr_init(fsstat->fattr);
3317         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3318 }
3319
3320 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3321 {
3322         struct nfs4_exception exception = { };
3323         int err;
3324         do {
3325                 err = nfs4_handle_exception(server,
3326                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3327                                 &exception);
3328         } while (exception.retry);
3329         return err;
3330 }
3331
3332 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3333                 struct nfs_fsinfo *fsinfo)
3334 {
3335         struct nfs4_fsinfo_arg args = {
3336                 .fh = fhandle,
3337                 .bitmask = server->attr_bitmask,
3338         };
3339         struct nfs4_fsinfo_res res = {
3340                 .fsinfo = fsinfo,
3341         };
3342         struct rpc_message msg = {
3343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3344                 .rpc_argp = &args,
3345                 .rpc_resp = &res,
3346         };
3347
3348         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3349 }
3350
3351 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3352 {
3353         struct nfs4_exception exception = { };
3354         int err;
3355
3356         do {
3357                 err = nfs4_handle_exception(server,
3358                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3359                                 &exception);
3360         } while (exception.retry);
3361         return err;
3362 }
3363
3364 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3365 {
3366         int error;
3367
3368         nfs_fattr_init(fsinfo->fattr);
3369         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3370         if (error == 0) {
3371                 /* block layout checks this! */
3372                 server->pnfs_blksize = fsinfo->blksize;
3373                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3374         }
3375
3376         return error;
3377 }
3378
3379 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3380                 struct nfs_pathconf *pathconf)
3381 {
3382         struct nfs4_pathconf_arg args = {
3383                 .fh = fhandle,
3384                 .bitmask = server->attr_bitmask,
3385         };
3386         struct nfs4_pathconf_res res = {
3387                 .pathconf = pathconf,
3388         };
3389         struct rpc_message msg = {
3390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3391                 .rpc_argp = &args,
3392                 .rpc_resp = &res,
3393         };
3394
3395         /* None of the pathconf attributes are mandatory to implement */
3396         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3397                 memset(pathconf, 0, sizeof(*pathconf));
3398                 return 0;
3399         }
3400
3401         nfs_fattr_init(pathconf->fattr);
3402         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3403 }
3404
3405 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3406                 struct nfs_pathconf *pathconf)
3407 {
3408         struct nfs4_exception exception = { };
3409         int err;
3410
3411         do {
3412                 err = nfs4_handle_exception(server,
3413                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3414                                 &exception);
3415         } while (exception.retry);
3416         return err;
3417 }
3418
3419 void __nfs4_read_done_cb(struct nfs_read_data *data)
3420 {
3421         nfs_invalidate_atime(data->header->inode);
3422 }
3423
3424 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3425 {
3426         struct nfs_server *server = NFS_SERVER(data->header->inode);
3427
3428         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3429                 rpc_restart_call_prepare(task);
3430                 return -EAGAIN;
3431         }
3432
3433         __nfs4_read_done_cb(data);
3434         if (task->tk_status > 0)
3435                 renew_lease(server, data->timestamp);
3436         return 0;
3437 }
3438
3439 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3440 {
3441
3442         dprintk("--> %s\n", __func__);
3443
3444         if (!nfs4_sequence_done(task, &data->res.seq_res))
3445                 return -EAGAIN;
3446
3447         return data->read_done_cb ? data->read_done_cb(task, data) :
3448                                     nfs4_read_done_cb(task, data);
3449 }
3450
3451 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3452 {
3453         data->timestamp   = jiffies;
3454         data->read_done_cb = nfs4_read_done_cb;
3455         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3456         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3457 }
3458
3459 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3460 {
3461         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3462                                 &data->args.seq_args,
3463                                 &data->res.seq_res,
3464                                 task))
3465                 return;
3466         rpc_call_start(task);
3467 }
3468
3469 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3470 {
3471         struct inode *inode = data->header->inode;
3472
3473         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3474                 rpc_restart_call_prepare(task);
3475                 return -EAGAIN;
3476         }
3477         if (task->tk_status >= 0) {
3478                 renew_lease(NFS_SERVER(inode), data->timestamp);
3479                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3480         }
3481         return 0;
3482 }
3483
3484 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3485 {
3486         if (!nfs4_sequence_done(task, &data->res.seq_res))
3487                 return -EAGAIN;
3488         return data->write_done_cb ? data->write_done_cb(task, data) :
3489                 nfs4_write_done_cb(task, data);
3490 }
3491
3492 static
3493 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3494 {
3495         const struct nfs_pgio_header *hdr = data->header;
3496
3497         /* Don't request attributes for pNFS or O_DIRECT writes */
3498         if (data->ds_clp != NULL || hdr->dreq != NULL)
3499                 return false;
3500         /* Otherwise, request attributes if and only if we don't hold
3501          * a delegation
3502          */
3503         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3504 }
3505
3506 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3507 {
3508         struct nfs_server *server = NFS_SERVER(data->header->inode);
3509
3510         if (!nfs4_write_need_cache_consistency_data(data)) {
3511                 data->args.bitmask = NULL;
3512                 data->res.fattr = NULL;
3513         } else
3514                 data->args.bitmask = server->cache_consistency_bitmask;
3515
3516         if (!data->write_done_cb)
3517                 data->write_done_cb = nfs4_write_done_cb;
3518         data->res.server = server;
3519         data->timestamp   = jiffies;
3520
3521         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3522         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3523 }
3524
3525 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3526 {
3527         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3528                                 &data->args.seq_args,
3529                                 &data->res.seq_res,
3530                                 task))
3531                 return;
3532         rpc_call_start(task);
3533 }
3534
3535 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3536 {
3537         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3538                                 &data->args.seq_args,
3539                                 &data->res.seq_res,
3540                                 task))
3541                 return;
3542         rpc_call_start(task);
3543 }
3544
3545 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3546 {
3547         struct inode *inode = data->inode;
3548
3549         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3550                 rpc_restart_call_prepare(task);
3551                 return -EAGAIN;
3552         }
3553         return 0;
3554 }
3555
3556 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3557 {
3558         if (!nfs4_sequence_done(task, &data->res.seq_res))
3559                 return -EAGAIN;
3560         return data->commit_done_cb(task, data);
3561 }
3562
3563 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3564 {
3565         struct nfs_server *server = NFS_SERVER(data->inode);
3566
3567         if (data->commit_done_cb == NULL)
3568                 data->commit_done_cb = nfs4_commit_done_cb;
3569         data->res.server = server;
3570         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3571         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3572 }
3573
3574 struct nfs4_renewdata {
3575         struct nfs_client       *client;
3576         unsigned long           timestamp;
3577 };
3578
3579 /*
3580  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3581  * standalone procedure for queueing an asynchronous RENEW.
3582  */
3583 static void nfs4_renew_release(void *calldata)
3584 {
3585         struct nfs4_renewdata *data = calldata;
3586         struct nfs_client *clp = data->client;
3587
3588         if (atomic_read(&clp->cl_count) > 1)
3589                 nfs4_schedule_state_renewal(clp);
3590         nfs_put_client(clp);
3591         kfree(data);
3592 }
3593
3594 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3595 {
3596         struct nfs4_renewdata *data = calldata;
3597         struct nfs_client *clp = data->client;
3598         unsigned long timestamp = data->timestamp;
3599
3600         if (task->tk_status < 0) {
3601                 /* Unless we're shutting down, schedule state recovery! */
3602                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3603                         return;
3604                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3605                         nfs4_schedule_lease_recovery(clp);
3606                         return;
3607                 }
3608                 nfs4_schedule_path_down_recovery(clp);
3609         }
3610         do_renew_lease(clp, timestamp);
3611 }
3612
3613 static const struct rpc_call_ops nfs4_renew_ops = {
3614         .rpc_call_done = nfs4_renew_done,
3615         .rpc_release = nfs4_renew_release,
3616 };
3617
3618 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3619 {
3620         struct rpc_message msg = {
3621                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3622                 .rpc_argp       = clp,
3623                 .rpc_cred       = cred,
3624         };
3625         struct nfs4_renewdata *data;
3626
3627         if (renew_flags == 0)
3628                 return 0;
3629         if (!atomic_inc_not_zero(&clp->cl_count))
3630                 return -EIO;
3631         data = kmalloc(sizeof(*data), GFP_NOFS);
3632         if (data == NULL)
3633                 return -ENOMEM;
3634         data->client = clp;
3635         data->timestamp = jiffies;
3636         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3637                         &nfs4_renew_ops, data);
3638 }
3639
3640 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3641 {
3642         struct rpc_message msg = {
3643                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3644                 .rpc_argp       = clp,
3645                 .rpc_cred       = cred,
3646         };
3647         unsigned long now = jiffies;
3648         int status;
3649
3650         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3651         if (status < 0)
3652                 return status;
3653         do_renew_lease(clp, now);
3654         return 0;
3655 }
3656
3657 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3658 {
3659         return (server->caps & NFS_CAP_ACLS)
3660                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3661                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3662 }
3663
3664 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3665  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3666  * the stack.
3667  */
3668 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3669
3670 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3671                 struct page **pages, unsigned int *pgbase)
3672 {
3673         struct page *newpage, **spages;
3674         int rc = 0;
3675         size_t len;
3676         spages = pages;
3677
3678         do {
3679                 len = min_t(size_t, PAGE_SIZE, buflen);
3680                 newpage = alloc_page(GFP_KERNEL);
3681
3682                 if (newpage == NULL)
3683                         goto unwind;
3684                 memcpy(page_address(newpage), buf, len);
3685                 buf += len;
3686                 buflen -= len;
3687                 *pages++ = newpage;
3688                 rc++;
3689         } while (buflen != 0);
3690
3691         return rc;
3692
3693 unwind:
3694         for(; rc > 0; rc--)
3695                 __free_page(spages[rc-1]);
3696         return -ENOMEM;
3697 }
3698
3699 struct nfs4_cached_acl {
3700         int cached;
3701         size_t len;
3702         char data[0];
3703 };
3704
3705 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3706 {
3707         struct nfs_inode *nfsi = NFS_I(inode);
3708
3709         spin_lock(&inode->i_lock);
3710         kfree(nfsi->nfs4_acl);
3711         nfsi->nfs4_acl = acl;
3712         spin_unlock(&inode->i_lock);
3713 }
3714
3715 static void nfs4_zap_acl_attr(struct inode *inode)
3716 {
3717         nfs4_set_cached_acl(inode, NULL);
3718 }
3719
3720 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3721 {
3722         struct nfs_inode *nfsi = NFS_I(inode);
3723         struct nfs4_cached_acl *acl;
3724         int ret = -ENOENT;
3725
3726         spin_lock(&inode->i_lock);
3727         acl = nfsi->nfs4_acl;
3728         if (acl == NULL)
3729                 goto out;
3730         if (buf == NULL) /* user is just asking for length */
3731                 goto out_len;
3732         if (acl->cached == 0)
3733                 goto out;
3734         ret = -ERANGE; /* see getxattr(2) man page */
3735         if (acl->len > buflen)
3736                 goto out;
3737         memcpy(buf, acl->data, acl->len);
3738 out_len:
3739         ret = acl->len;
3740 out:
3741         spin_unlock(&inode->i_lock);
3742         return ret;
3743 }
3744
3745 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3746 {
3747         struct nfs4_cached_acl *acl;
3748         size_t buflen = sizeof(*acl) + acl_len;
3749
3750         if (buflen <= PAGE_SIZE) {
3751                 acl = kmalloc(buflen, GFP_KERNEL);
3752                 if (acl == NULL)
3753                         goto out;
3754                 acl->cached = 1;
3755                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3756         } else {
3757                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3758                 if (acl == NULL)
3759                         goto out;
3760                 acl->cached = 0;
3761         }
3762         acl->len = acl_len;
3763 out:
3764         nfs4_set_cached_acl(inode, acl);
3765 }
3766
3767 /*
3768  * The getxattr API returns the required buffer length when called with a
3769  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3770  * the required buf.  On a NULL buf, we send a page of data to the server
3771  * guessing that the ACL request can be serviced by a page. If so, we cache
3772  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3773  * the cache. If not so, we throw away the page, and cache the required
3774  * length. The next getxattr call will then produce another round trip to
3775  * the server, this time with the input buf of the required size.
3776  */
3777 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3778 {
3779         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3780         struct nfs_getaclargs args = {
3781                 .fh = NFS_FH(inode),
3782                 .acl_pages = pages,
3783                 .acl_len = buflen,
3784         };
3785         struct nfs_getaclres res = {
3786                 .acl_len = buflen,
3787         };
3788         struct rpc_message msg = {
3789                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3790                 .rpc_argp = &args,
3791                 .rpc_resp = &res,
3792         };
3793         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3794         int ret = -ENOMEM, i;
3795
3796         /* As long as we're doing a round trip to the server anyway,
3797          * let's be prepared for a page of acl data. */
3798         if (npages == 0)
3799                 npages = 1;
3800         if (npages > ARRAY_SIZE(pages))
3801                 return -ERANGE;
3802
3803         for (i = 0; i < npages; i++) {
3804                 pages[i] = alloc_page(GFP_KERNEL);
3805                 if (!pages[i])
3806                         goto out_free;
3807         }
3808
3809         /* for decoding across pages */
3810         res.acl_scratch = alloc_page(GFP_KERNEL);
3811         if (!res.acl_scratch)
3812                 goto out_free;
3813
3814         args.acl_len = npages * PAGE_SIZE;
3815         args.acl_pgbase = 0;
3816
3817         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3818                 __func__, buf, buflen, npages, args.acl_len);
3819         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3820                              &msg, &args.seq_args, &res.seq_res, 0);
3821         if (ret)
3822                 goto out_free;
3823
3824         /* Handle the case where the passed-in buffer is too short */
3825         if (res.acl_flags & NFS4_ACL_TRUNC) {
3826                 /* Did the user only issue a request for the acl length? */
3827                 if (buf == NULL)
3828                         goto out_ok;
3829                 ret = -ERANGE;
3830                 goto out_free;
3831         }
3832         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3833         if (buf)
3834                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3835 out_ok:
3836         ret = res.acl_len;
3837 out_free:
3838         for (i = 0; i < npages; i++)
3839                 if (pages[i])
3840                         __free_page(pages[i]);
3841         if (res.acl_scratch)
3842                 __free_page(res.acl_scratch);
3843         return ret;
3844 }
3845
3846 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3847 {
3848         struct nfs4_exception exception = { };
3849         ssize_t ret;
3850         do {
3851                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3852                 if (ret >= 0)
3853                         break;
3854                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3855         } while (exception.retry);
3856         return ret;
3857 }
3858
3859 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3860 {
3861         struct nfs_server *server = NFS_SERVER(inode);
3862         int ret;
3863
3864         if (!nfs4_server_supports_acls(server))
3865                 return -EOPNOTSUPP;
3866         ret = nfs_revalidate_inode(server, inode);
3867         if (ret < 0)
3868                 return ret;
3869         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3870                 nfs_zap_acl_cache(inode);
3871         ret = nfs4_read_cached_acl(inode, buf, buflen);
3872         if (ret != -ENOENT)
3873                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3874                  * but no cached acl data, just the acl length */
3875                 return ret;
3876         return nfs4_get_acl_uncached(inode, buf, buflen);
3877 }
3878
3879 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3880 {
3881         struct nfs_server *server = NFS_SERVER(inode);
3882         struct page *pages[NFS4ACL_MAXPAGES];
3883         struct nfs_setaclargs arg = {
3884                 .fh             = NFS_FH(inode),
3885                 .acl_pages      = pages,
3886                 .acl_len        = buflen,
3887         };
3888         struct nfs_setaclres res;
3889         struct rpc_message msg = {
3890                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3891                 .rpc_argp       = &arg,
3892                 .rpc_resp       = &res,
3893         };
3894         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3895         int ret, i;
3896
3897         if (!nfs4_server_supports_acls(server))
3898                 return -EOPNOTSUPP;
3899         if (npages > ARRAY_SIZE(pages))
3900                 return -ERANGE;
3901         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3902         if (i < 0)
3903                 return i;
3904         nfs4_inode_return_delegation(inode);
3905         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3906
3907         /*
3908          * Free each page after tx, so the only ref left is
3909          * held by the network stack
3910          */
3911         for (; i > 0; i--)
3912                 put_page(pages[i-1]);
3913
3914         /*
3915          * Acl update can result in inode attribute update.
3916          * so mark the attribute cache invalid.
3917          */
3918         spin_lock(&inode->i_lock);
3919         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3920         spin_unlock(&inode->i_lock);
3921         nfs_access_zap_cache(inode);
3922         nfs_zap_acl_cache(inode);
3923         return ret;
3924 }
3925
3926 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3927 {
3928         struct nfs4_exception exception = { };
3929         int err;
3930         do {
3931                 err = nfs4_handle_exception(NFS_SERVER(inode),
3932                                 __nfs4_proc_set_acl(inode, buf, buflen),
3933                                 &exception);
3934         } while (exception.retry);
3935         return err;
3936 }
3937
3938 static int
3939 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3940 {
3941         struct nfs_client *clp = server->nfs_client;
3942
3943         if (task->tk_status >= 0)
3944                 return 0;
3945         switch(task->tk_status) {
3946                 case -NFS4ERR_DELEG_REVOKED:
3947                 case -NFS4ERR_ADMIN_REVOKED:
3948                 case -NFS4ERR_BAD_STATEID:
3949                         if (state == NULL)
3950                                 break;
3951                         nfs_remove_bad_delegation(state->inode);
3952                 case -NFS4ERR_OPENMODE:
3953                         if (state == NULL)
3954                                 break;
3955                         nfs4_schedule_stateid_recovery(server, state);
3956                         goto wait_on_recovery;
3957                 case -NFS4ERR_EXPIRED:
3958                         if (state != NULL)
3959                                 nfs4_schedule_stateid_recovery(server, state);
3960                 case -NFS4ERR_STALE_STATEID:
3961                 case -NFS4ERR_STALE_CLIENTID:
3962                         nfs4_schedule_lease_recovery(clp);
3963                         goto wait_on_recovery;
3964 #if defined(CONFIG_NFS_V4_1)
3965                 case -NFS4ERR_BADSESSION:
3966                 case -NFS4ERR_BADSLOT:
3967                 case -NFS4ERR_BAD_HIGH_SLOT:
3968                 case -NFS4ERR_DEADSESSION:
3969                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3970                 case -NFS4ERR_SEQ_FALSE_RETRY:
3971                 case -NFS4ERR_SEQ_MISORDERED:
3972                         dprintk("%s ERROR %d, Reset session\n", __func__,
3973                                 task->tk_status);
3974                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3975                         task->tk_status = 0;
3976                         return -EAGAIN;
3977 #endif /* CONFIG_NFS_V4_1 */
3978                 case -NFS4ERR_DELAY:
3979                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3980                 case -NFS4ERR_GRACE:
3981                 case -EKEYEXPIRED:
3982                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3983                         task->tk_status = 0;
3984                         return -EAGAIN;
3985                 case -NFS4ERR_RETRY_UNCACHED_REP:
3986                 case -NFS4ERR_OLD_STATEID:
3987                         task->tk_status = 0;
3988                         return -EAGAIN;
3989         }
3990         task->tk_status = nfs4_map_errors(task->tk_status);
3991         return 0;
3992 wait_on_recovery:
3993         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3994         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3995                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3996         task->tk_status = 0;
3997         return -EAGAIN;
3998 }
3999
4000 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4001                                     nfs4_verifier *bootverf)
4002 {
4003         __be32 verf[2];
4004
4005         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4006                 /* An impossible timestamp guarantees this value
4007                  * will never match a generated boot time. */
4008                 verf[0] = 0;
4009                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4010         } else {
4011                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4012                 verf[0] = (__be32)nn->boot_time.tv_sec;
4013                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4014         }
4015         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4016 }
4017
4018 static unsigned int
4019 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4020                                    char *buf, size_t len)
4021 {
4022         unsigned int result;
4023
4024         rcu_read_lock();
4025         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4026                                 clp->cl_ipaddr,
4027                                 rpc_peeraddr2str(clp->cl_rpcclient,
4028                                                         RPC_DISPLAY_ADDR),
4029                                 rpc_peeraddr2str(clp->cl_rpcclient,
4030                                                         RPC_DISPLAY_PROTO));
4031         rcu_read_unlock();
4032         return result;
4033 }
4034
4035 static unsigned int
4036 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4037                                 char *buf, size_t len)
4038 {
4039         char *nodename = clp->cl_rpcclient->cl_nodename;
4040
4041         if (nfs4_client_id_uniquifier[0] != '\0')
4042                 nodename = nfs4_client_id_uniquifier;
4043         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4044                                 clp->rpc_ops->version, clp->cl_minorversion,
4045                                 nodename);
4046 }
4047
4048 /**
4049  * nfs4_proc_setclientid - Negotiate client ID
4050  * @clp: state data structure
4051  * @program: RPC program for NFSv4 callback service
4052  * @port: IP port number for NFS4 callback service
4053  * @cred: RPC credential to use for this call
4054  * @res: where to place the result
4055  *
4056  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4057  */
4058 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4059                 unsigned short port, struct rpc_cred *cred,
4060                 struct nfs4_setclientid_res *res)
4061 {
4062         nfs4_verifier sc_verifier;
4063         struct nfs4_setclientid setclientid = {
4064                 .sc_verifier = &sc_verifier,
4065                 .sc_prog = program,
4066                 .sc_cb_ident = clp->cl_cb_ident,
4067         };
4068         struct rpc_message msg = {
4069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4070                 .rpc_argp = &setclientid,
4071                 .rpc_resp = res,
4072                 .rpc_cred = cred,
4073         };
4074         int status;
4075
4076         /* nfs_client_id4 */
4077         nfs4_init_boot_verifier(clp, &sc_verifier);
4078         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4079                 setclientid.sc_name_len =
4080                                 nfs4_init_uniform_client_string(clp,
4081                                                 setclientid.sc_name,
4082                                                 sizeof(setclientid.sc_name));
4083         else
4084                 setclientid.sc_name_len =
4085                                 nfs4_init_nonuniform_client_string(clp,
4086                                                 setclientid.sc_name,
4087                                                 sizeof(setclientid.sc_name));
4088         /* cb_client4 */
4089         rcu_read_lock();
4090         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4091                                 sizeof(setclientid.sc_netid),
4092                                 rpc_peeraddr2str(clp->cl_rpcclient,
4093                                                         RPC_DISPLAY_NETID));
4094         rcu_read_unlock();
4095         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4096                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4097                                 clp->cl_ipaddr, port >> 8, port & 255);
4098
4099         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4100                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4101                 setclientid.sc_name_len, setclientid.sc_name);
4102         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4103         dprintk("NFS reply setclientid: %d\n", status);
4104         return status;
4105 }
4106
4107 /**
4108  * nfs4_proc_setclientid_confirm - Confirm client ID
4109  * @clp: state data structure
4110  * @res: result of a previous SETCLIENTID
4111  * @cred: RPC credential to use for this call
4112  *
4113  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4114  */
4115 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4116                 struct nfs4_setclientid_res *arg,
4117                 struct rpc_cred *cred)
4118 {
4119         struct nfs_fsinfo fsinfo;
4120         struct rpc_message msg = {
4121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4122                 .rpc_argp = arg,
4123                 .rpc_resp = &fsinfo,
4124                 .rpc_cred = cred,
4125         };
4126         unsigned long now;
4127         int status;
4128
4129         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4130                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4131                 clp->cl_clientid);
4132         now = jiffies;
4133         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4134         if (status == 0) {
4135                 spin_lock(&clp->cl_lock);
4136                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4137                 clp->cl_last_renewal = now;
4138                 spin_unlock(&clp->cl_lock);
4139         }
4140         dprintk("NFS reply setclientid_confirm: %d\n", status);
4141         return status;
4142 }
4143
4144 struct nfs4_delegreturndata {
4145         struct nfs4_delegreturnargs args;
4146         struct nfs4_delegreturnres res;
4147         struct nfs_fh fh;
4148         nfs4_stateid stateid;
4149         unsigned long timestamp;
4150         struct nfs_fattr fattr;
4151         int rpc_status;
4152 };
4153
4154 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4155 {
4156         struct nfs4_delegreturndata *data = calldata;
4157
4158         if (!nfs4_sequence_done(task, &data->res.seq_res))
4159                 return;
4160
4161         switch (task->tk_status) {
4162         case -NFS4ERR_STALE_STATEID:
4163         case -NFS4ERR_EXPIRED:
4164         case 0:
4165                 renew_lease(data->res.server, data->timestamp);
4166                 break;
4167         default:
4168                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4169                                 -EAGAIN) {
4170                         rpc_restart_call_prepare(task);
4171                         return;
4172                 }
4173         }
4174         data->rpc_status = task->tk_status;
4175 }
4176
4177 static void nfs4_delegreturn_release(void *calldata)
4178 {
4179         kfree(calldata);
4180 }
4181
4182 #if defined(CONFIG_NFS_V4_1)
4183 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4184 {
4185         struct nfs4_delegreturndata *d_data;
4186
4187         d_data = (struct nfs4_delegreturndata *)data;
4188
4189         if (nfs4_setup_sequence(d_data->res.server,
4190                                 &d_data->args.seq_args,
4191                                 &d_data->res.seq_res, task))
4192                 return;
4193         rpc_call_start(task);
4194 }
4195 #endif /* CONFIG_NFS_V4_1 */
4196
4197 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4198 #if defined(CONFIG_NFS_V4_1)
4199         .rpc_call_prepare = nfs4_delegreturn_prepare,
4200 #endif /* CONFIG_NFS_V4_1 */
4201         .rpc_call_done = nfs4_delegreturn_done,
4202         .rpc_release = nfs4_delegreturn_release,
4203 };
4204
4205 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4206 {
4207         struct nfs4_delegreturndata *data;
4208         struct nfs_server *server = NFS_SERVER(inode);
4209         struct rpc_task *task;
4210         struct rpc_message msg = {
4211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4212                 .rpc_cred = cred,
4213         };
4214         struct rpc_task_setup task_setup_data = {
4215                 .rpc_client = server->client,
4216                 .rpc_message = &msg,
4217                 .callback_ops = &nfs4_delegreturn_ops,
4218                 .flags = RPC_TASK_ASYNC,
4219         };
4220         int status = 0;
4221
4222         data = kzalloc(sizeof(*data), GFP_NOFS);
4223         if (data == NULL)
4224                 return -ENOMEM;
4225         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4226         data->args.fhandle = &data->fh;
4227         data->args.stateid = &data->stateid;
4228         data->args.bitmask = server->cache_consistency_bitmask;
4229         nfs_copy_fh(&data->fh, NFS_FH(inode));
4230         nfs4_stateid_copy(&data->stateid, stateid);
4231         data->res.fattr = &data->fattr;
4232         data->res.server = server;
4233         nfs_fattr_init(data->res.fattr);
4234         data->timestamp = jiffies;
4235         data->rpc_status = 0;
4236
4237         task_setup_data.callback_data = data;
4238         msg.rpc_argp = &data->args;
4239         msg.rpc_resp = &data->res;
4240         task = rpc_run_task(&task_setup_data);
4241         if (IS_ERR(task))
4242                 return PTR_ERR(task);
4243         if (!issync)
4244                 goto out;
4245         status = nfs4_wait_for_completion_rpc_task(task);
4246         if (status != 0)
4247                 goto out;
4248         status = data->rpc_status;
4249         if (status == 0)
4250                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4251         else
4252                 nfs_refresh_inode(inode, &data->fattr);
4253 out:
4254         rpc_put_task(task);
4255         return status;
4256 }
4257
4258 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4259 {
4260         struct nfs_server *server = NFS_SERVER(inode);
4261         struct nfs4_exception exception = { };
4262         int err;
4263         do {
4264                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4265                 switch (err) {
4266                         case -NFS4ERR_STALE_STATEID:
4267                         case -NFS4ERR_EXPIRED:
4268                         case 0:
4269                                 return 0;
4270                 }
4271                 err = nfs4_handle_exception(server, err, &exception);
4272         } while (exception.retry);
4273         return err;
4274 }
4275
4276 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4277 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4278
4279 /*
4280  * sleep, with exponential backoff, and retry the LOCK operation.
4281  */
4282 static unsigned long
4283 nfs4_set_lock_task_retry(unsigned long timeout)
4284 {
4285         freezable_schedule_timeout_killable(timeout);
4286         timeout <<= 1;
4287         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4288                 return NFS4_LOCK_MAXTIMEOUT;
4289         return timeout;
4290 }
4291
4292 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4293 {
4294         struct inode *inode = state->inode;
4295         struct nfs_server *server = NFS_SERVER(inode);
4296         struct nfs_client *clp = server->nfs_client;
4297         struct nfs_lockt_args arg = {
4298                 .fh = NFS_FH(inode),
4299                 .fl = request,
4300         };
4301         struct nfs_lockt_res res = {
4302                 .denied = request,
4303         };
4304         struct rpc_message msg = {
4305                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4306                 .rpc_argp       = &arg,
4307                 .rpc_resp       = &res,
4308                 .rpc_cred       = state->owner->so_cred,
4309         };
4310         struct nfs4_lock_state *lsp;
4311         int status;
4312
4313         arg.lock_owner.clientid = clp->cl_clientid;
4314         status = nfs4_set_lock_state(state, request);
4315         if (status != 0)
4316                 goto out;
4317         lsp = request->fl_u.nfs4_fl.owner;
4318         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4319         arg.lock_owner.s_dev = server->s_dev;
4320         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4321         switch (status) {
4322                 case 0:
4323                         request->fl_type = F_UNLCK;
4324                         break;
4325                 case -NFS4ERR_DENIED:
4326                         status = 0;
4327         }
4328         request->fl_ops->fl_release_private(request);
4329 out:
4330         return status;
4331 }
4332
4333 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4334 {
4335         struct nfs4_exception exception = { };
4336         int err;
4337
4338         do {
4339                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4340                                 _nfs4_proc_getlk(state, cmd, request),
4341                                 &exception);
4342         } while (exception.retry);
4343         return err;
4344 }
4345
4346 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4347 {
4348         int res = 0;
4349         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4350                 case FL_POSIX:
4351                         res = posix_lock_file_wait(file, fl);
4352                         break;
4353                 case FL_FLOCK:
4354                         res = flock_lock_file_wait(file, fl);
4355                         break;
4356                 default:
4357                         BUG();
4358         }
4359         return res;
4360 }
4361
4362 struct nfs4_unlockdata {
4363         struct nfs_locku_args arg;
4364         struct nfs_locku_res res;
4365         struct nfs4_lock_state *lsp;
4366         struct nfs_open_context *ctx;
4367         struct file_lock fl;
4368         const struct nfs_server *server;
4369         unsigned long timestamp;
4370 };
4371
4372 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4373                 struct nfs_open_context *ctx,
4374                 struct nfs4_lock_state *lsp,
4375                 struct nfs_seqid *seqid)
4376 {
4377         struct nfs4_unlockdata *p;
4378         struct inode *inode = lsp->ls_state->inode;
4379
4380         p = kzalloc(sizeof(*p), GFP_NOFS);
4381         if (p == NULL)
4382                 return NULL;
4383         p->arg.fh = NFS_FH(inode);
4384         p->arg.fl = &p->fl;
4385         p->arg.seqid = seqid;
4386         p->res.seqid = seqid;
4387         p->arg.stateid = &lsp->ls_stateid;
4388         p->lsp = lsp;
4389         atomic_inc(&lsp->ls_count);
4390         /* Ensure we don't close file until we're done freeing locks! */
4391         p->ctx = get_nfs_open_context(ctx);
4392         memcpy(&p->fl, fl, sizeof(p->fl));
4393         p->server = NFS_SERVER(inode);
4394         return p;
4395 }
4396
4397 static void nfs4_locku_release_calldata(void *data)
4398 {
4399         struct nfs4_unlockdata *calldata = data;
4400         nfs_free_seqid(calldata->arg.seqid);
4401         nfs4_put_lock_state(calldata->lsp);
4402         put_nfs_open_context(calldata->ctx);
4403         kfree(calldata);
4404 }
4405
4406 static void nfs4_locku_done(struct rpc_task *task, void *data)
4407 {
4408         struct nfs4_unlockdata *calldata = data;
4409
4410         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4411                 return;
4412         switch (task->tk_status) {
4413                 case 0:
4414                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4415                                         &calldata->res.stateid);
4416                         renew_lease(calldata->server, calldata->timestamp);
4417                         break;
4418                 case -NFS4ERR_BAD_STATEID:
4419                 case -NFS4ERR_OLD_STATEID:
4420                 case -NFS4ERR_STALE_STATEID:
4421                 case -NFS4ERR_EXPIRED:
4422                         break;
4423                 default:
4424                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4425                                 rpc_restart_call_prepare(task);
4426         }
4427         nfs_release_seqid(calldata->arg.seqid);
4428 }
4429
4430 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4431 {
4432         struct nfs4_unlockdata *calldata = data;
4433
4434         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4435                 return;
4436         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4437                 /* Note: exit _without_ running nfs4_locku_done */
4438                 task->tk_action = NULL;
4439                 return;
4440         }
4441         calldata->timestamp = jiffies;
4442         if (nfs4_setup_sequence(calldata->server,
4443                                 &calldata->arg.seq_args,
4444                                 &calldata->res.seq_res,
4445                                 task) != 0)
4446                 nfs_release_seqid(calldata->arg.seqid);
4447         else
4448                 rpc_call_start(task);
4449 }
4450
4451 static const struct rpc_call_ops nfs4_locku_ops = {
4452         .rpc_call_prepare = nfs4_locku_prepare,
4453         .rpc_call_done = nfs4_locku_done,
4454         .rpc_release = nfs4_locku_release_calldata,
4455 };
4456
4457 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4458                 struct nfs_open_context *ctx,
4459                 struct nfs4_lock_state *lsp,
4460                 struct nfs_seqid *seqid)
4461 {
4462         struct nfs4_unlockdata *data;
4463         struct rpc_message msg = {
4464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4465                 .rpc_cred = ctx->cred,
4466         };
4467         struct rpc_task_setup task_setup_data = {
4468                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4469                 .rpc_message = &msg,
4470                 .callback_ops = &nfs4_locku_ops,
4471                 .workqueue = nfsiod_workqueue,
4472                 .flags = RPC_TASK_ASYNC,
4473         };
4474
4475         /* Ensure this is an unlock - when canceling a lock, the
4476          * canceled lock is passed in, and it won't be an unlock.
4477          */
4478         fl->fl_type = F_UNLCK;
4479
4480         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4481         if (data == NULL) {
4482                 nfs_free_seqid(seqid);
4483                 return ERR_PTR(-ENOMEM);
4484         }
4485
4486         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4487         msg.rpc_argp = &data->arg;
4488         msg.rpc_resp = &data->res;
4489         task_setup_data.callback_data = data;
4490         return rpc_run_task(&task_setup_data);
4491 }
4492
4493 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4494 {
4495         struct nfs_inode *nfsi = NFS_I(state->inode);
4496         struct nfs_seqid *seqid;
4497         struct nfs4_lock_state *lsp;
4498         struct rpc_task *task;
4499         int status = 0;
4500         unsigned char fl_flags = request->fl_flags;
4501
4502         status = nfs4_set_lock_state(state, request);
4503         /* Unlock _before_ we do the RPC call */
4504         request->fl_flags |= FL_EXISTS;
4505         down_read(&nfsi->rwsem);
4506         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4507                 up_read(&nfsi->rwsem);
4508                 goto out;
4509         }
4510         up_read(&nfsi->rwsem);
4511         if (status != 0)
4512                 goto out;
4513         /* Is this a delegated lock? */
4514         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4515                 goto out;
4516         lsp = request->fl_u.nfs4_fl.owner;
4517         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4518         status = -ENOMEM;
4519         if (seqid == NULL)
4520                 goto out;
4521         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4522         status = PTR_ERR(task);
4523         if (IS_ERR(task))
4524                 goto out;
4525         status = nfs4_wait_for_completion_rpc_task(task);
4526         rpc_put_task(task);
4527 out:
4528         request->fl_flags = fl_flags;
4529         return status;
4530 }
4531
4532 struct nfs4_lockdata {
4533         struct nfs_lock_args arg;
4534         struct nfs_lock_res res;
4535         struct nfs4_lock_state *lsp;
4536         struct nfs_open_context *ctx;
4537         struct file_lock fl;
4538         unsigned long timestamp;
4539         int rpc_status;
4540         int cancelled;
4541         struct nfs_server *server;
4542 };
4543
4544 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4545                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4546                 gfp_t gfp_mask)
4547 {
4548         struct nfs4_lockdata *p;
4549         struct inode *inode = lsp->ls_state->inode;
4550         struct nfs_server *server = NFS_SERVER(inode);
4551
4552         p = kzalloc(sizeof(*p), gfp_mask);
4553         if (p == NULL)
4554                 return NULL;
4555
4556         p->arg.fh = NFS_FH(inode);
4557         p->arg.fl = &p->fl;
4558         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4559         if (p->arg.open_seqid == NULL)
4560                 goto out_free;
4561         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4562         if (p->arg.lock_seqid == NULL)
4563                 goto out_free_seqid;
4564         p->arg.lock_stateid = &lsp->ls_stateid;
4565         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4566         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4567         p->arg.lock_owner.s_dev = server->s_dev;
4568         p->res.lock_seqid = p->arg.lock_seqid;
4569         p->lsp = lsp;
4570         p->server = server;
4571         atomic_inc(&lsp->ls_count);
4572         p->ctx = get_nfs_open_context(ctx);
4573         memcpy(&p->fl, fl, sizeof(p->fl));
4574         return p;
4575 out_free_seqid:
4576         nfs_free_seqid(p->arg.open_seqid);
4577 out_free:
4578         kfree(p);
4579         return NULL;
4580 }
4581
4582 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4583 {
4584         struct nfs4_lockdata *data = calldata;
4585         struct nfs4_state *state = data->lsp->ls_state;
4586
4587         dprintk("%s: begin!\n", __func__);
4588         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4589                 return;
4590         /* Do we need to do an open_to_lock_owner? */
4591         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4592                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4593                         goto out_release_lock_seqid;
4594                 data->arg.open_stateid = &state->stateid;
4595                 data->arg.new_lock_owner = 1;
4596                 data->res.open_seqid = data->arg.open_seqid;
4597         } else
4598                 data->arg.new_lock_owner = 0;
4599         data->timestamp = jiffies;
4600         if (nfs4_setup_sequence(data->server,
4601                                 &data->arg.seq_args,
4602                                 &data->res.seq_res,
4603                                 task) == 0) {
4604                 rpc_call_start(task);
4605                 return;
4606         }
4607         nfs_release_seqid(data->arg.open_seqid);
4608 out_release_lock_seqid:
4609         nfs_release_seqid(data->arg.lock_seqid);
4610         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4611 }
4612
4613 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4614 {
4615         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4616         nfs4_lock_prepare(task, calldata);
4617 }
4618
4619 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4620 {
4621         struct nfs4_lockdata *data = calldata;
4622
4623         dprintk("%s: begin!\n", __func__);
4624
4625         if (!nfs4_sequence_done(task, &data->res.seq_res))
4626                 return;
4627
4628         data->rpc_status = task->tk_status;
4629         if (data->arg.new_lock_owner != 0) {
4630                 if (data->rpc_status == 0)
4631                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4632                 else
4633                         goto out;
4634         }
4635         if (data->rpc_status == 0) {
4636                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4637                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4638                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4639         }
4640 out:
4641         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4642 }
4643
4644 static void nfs4_lock_release(void *calldata)
4645 {
4646         struct nfs4_lockdata *data = calldata;
4647
4648         dprintk("%s: begin!\n", __func__);
4649         nfs_free_seqid(data->arg.open_seqid);
4650         if (data->cancelled != 0) {
4651                 struct rpc_task *task;
4652                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4653                                 data->arg.lock_seqid);
4654                 if (!IS_ERR(task))
4655                         rpc_put_task_async(task);
4656                 dprintk("%s: cancelling lock!\n", __func__);
4657         } else
4658                 nfs_free_seqid(data->arg.lock_seqid);
4659         nfs4_put_lock_state(data->lsp);
4660         put_nfs_open_context(data->ctx);
4661         kfree(data);
4662         dprintk("%s: done!\n", __func__);
4663 }
4664
4665 static const struct rpc_call_ops nfs4_lock_ops = {
4666         .rpc_call_prepare = nfs4_lock_prepare,
4667         .rpc_call_done = nfs4_lock_done,
4668         .rpc_release = nfs4_lock_release,
4669 };
4670
4671 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4672         .rpc_call_prepare = nfs4_recover_lock_prepare,
4673         .rpc_call_done = nfs4_lock_done,
4674         .rpc_release = nfs4_lock_release,
4675 };
4676
4677 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4678 {
4679         switch (error) {
4680         case -NFS4ERR_ADMIN_REVOKED:
4681         case -NFS4ERR_BAD_STATEID:
4682                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4683                 if (new_lock_owner != 0 ||
4684                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4685                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4686                 break;
4687         case -NFS4ERR_STALE_STATEID:
4688                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4689         case -NFS4ERR_EXPIRED:
4690                 nfs4_schedule_lease_recovery(server->nfs_client);
4691         };
4692 }
4693
4694 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4695 {
4696         struct nfs4_lockdata *data;
4697         struct rpc_task *task;
4698         struct rpc_message msg = {
4699                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4700                 .rpc_cred = state->owner->so_cred,
4701         };
4702         struct rpc_task_setup task_setup_data = {
4703                 .rpc_client = NFS_CLIENT(state->inode),
4704                 .rpc_message = &msg,
4705                 .callback_ops = &nfs4_lock_ops,
4706                 .workqueue = nfsiod_workqueue,
4707                 .flags = RPC_TASK_ASYNC,
4708         };
4709         int ret;
4710
4711         dprintk("%s: begin!\n", __func__);
4712         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4713                         fl->fl_u.nfs4_fl.owner,
4714                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4715         if (data == NULL)
4716                 return -ENOMEM;
4717         if (IS_SETLKW(cmd))
4718                 data->arg.block = 1;
4719         if (recovery_type > NFS_LOCK_NEW) {
4720                 if (recovery_type == NFS_LOCK_RECLAIM)
4721                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4722                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4723         }
4724         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4725         msg.rpc_argp = &data->arg;
4726         msg.rpc_resp = &data->res;
4727         task_setup_data.callback_data = data;
4728         task = rpc_run_task(&task_setup_data);
4729         if (IS_ERR(task))
4730                 return PTR_ERR(task);
4731         ret = nfs4_wait_for_completion_rpc_task(task);
4732         if (ret == 0) {
4733                 ret = data->rpc_status;
4734                 if (ret)
4735                         nfs4_handle_setlk_error(data->server, data->lsp,
4736                                         data->arg.new_lock_owner, ret);
4737         } else
4738                 data->cancelled = 1;
4739         rpc_put_task(task);
4740         dprintk("%s: done, ret = %d!\n", __func__, ret);
4741         return ret;
4742 }
4743
4744 static int nfs4_lock_reclaim(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         do {
4753                 /* Cache the lock if possible... */
4754                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4755                         return 0;
4756                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4757                 if (err != -NFS4ERR_DELAY)
4758                         break;
4759                 nfs4_handle_exception(server, err, &exception);
4760         } while (exception.retry);
4761         return err;
4762 }
4763
4764 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4765 {
4766         struct nfs_server *server = NFS_SERVER(state->inode);
4767         struct nfs4_exception exception = {
4768                 .inode = state->inode,
4769         };
4770         int err;
4771
4772         err = nfs4_set_lock_state(state, request);
4773         if (err != 0)
4774                 return err;
4775         do {
4776                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4777                         return 0;
4778                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4779                 switch (err) {
4780                 default:
4781                         goto out;
4782                 case -NFS4ERR_GRACE:
4783                 case -NFS4ERR_DELAY:
4784                         nfs4_handle_exception(server, err, &exception);
4785                         err = 0;
4786                 }
4787         } while (exception.retry);
4788 out:
4789         return err;
4790 }
4791
4792 #if defined(CONFIG_NFS_V4_1)
4793 /**
4794  * nfs41_check_expired_locks - possibly free a lock stateid
4795  *
4796  * @state: NFSv4 state for an inode
4797  *
4798  * Returns NFS_OK if recovery for this stateid is now finished.
4799  * Otherwise a negative NFS4ERR value is returned.
4800  */
4801 static int nfs41_check_expired_locks(struct nfs4_state *state)
4802 {
4803         int status, ret = -NFS4ERR_BAD_STATEID;
4804         struct nfs4_lock_state *lsp;
4805         struct nfs_server *server = NFS_SERVER(state->inode);
4806
4807         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4808                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4809                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4810                         if (status != NFS_OK) {
4811                                 /* Free the stateid unless the server
4812                                  * informs us the stateid is unrecognized. */
4813                                 if (status != -NFS4ERR_BAD_STATEID)
4814                                         nfs41_free_stateid(server,
4815                                                         &lsp->ls_stateid);
4816                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4817                                 ret = status;
4818                         }
4819                 }
4820         };
4821
4822         return ret;
4823 }
4824
4825 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4826 {
4827         int status = NFS_OK;
4828
4829         if (test_bit(LK_STATE_IN_USE, &state->flags))
4830                 status = nfs41_check_expired_locks(state);
4831         if (status != NFS_OK)
4832                 status = nfs4_lock_expired(state, request);
4833         return status;
4834 }
4835 #endif
4836
4837 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4838 {
4839         struct nfs_inode *nfsi = NFS_I(state->inode);
4840         unsigned char fl_flags = request->fl_flags;
4841         int status = -ENOLCK;
4842
4843         if ((fl_flags & FL_POSIX) &&
4844                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4845                 goto out;
4846         /* Is this a delegated open? */
4847         status = nfs4_set_lock_state(state, request);
4848         if (status != 0)
4849                 goto out;
4850         request->fl_flags |= FL_ACCESS;
4851         status = do_vfs_lock(request->fl_file, request);
4852         if (status < 0)
4853                 goto out;
4854         down_read(&nfsi->rwsem);
4855         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4856                 /* Yes: cache locks! */
4857                 /* ...but avoid races with delegation recall... */
4858                 request->fl_flags = fl_flags & ~FL_SLEEP;
4859                 status = do_vfs_lock(request->fl_file, request);
4860                 goto out_unlock;
4861         }
4862         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4863         if (status != 0)
4864                 goto out_unlock;
4865         /* Note: we always want to sleep here! */
4866         request->fl_flags = fl_flags | FL_SLEEP;
4867         if (do_vfs_lock(request->fl_file, request) < 0)
4868                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4869                         "manager!\n", __func__);
4870 out_unlock:
4871         up_read(&nfsi->rwsem);
4872 out:
4873         request->fl_flags = fl_flags;
4874         return status;
4875 }
4876
4877 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4878 {
4879         struct nfs4_exception exception = {
4880                 .state = state,
4881                 .inode = state->inode,
4882         };
4883         int err;
4884
4885         do {
4886                 err = _nfs4_proc_setlk(state, cmd, request);
4887                 if (err == -NFS4ERR_DENIED)
4888                         err = -EAGAIN;
4889                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4890                                 err, &exception);
4891         } while (exception.retry);
4892         return err;
4893 }
4894
4895 static int
4896 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4897 {
4898         struct nfs_open_context *ctx;
4899         struct nfs4_state *state;
4900         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4901         int status;
4902
4903         /* verify open state */
4904         ctx = nfs_file_open_context(filp);
4905         state = ctx->state;
4906
4907         if (request->fl_start < 0 || request->fl_end < 0)
4908                 return -EINVAL;
4909
4910         if (IS_GETLK(cmd)) {
4911                 if (state != NULL)
4912                         return nfs4_proc_getlk(state, F_GETLK, request);
4913                 return 0;
4914         }
4915
4916         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4917                 return -EINVAL;
4918
4919         if (request->fl_type == F_UNLCK) {
4920                 if (state != NULL)
4921                         return nfs4_proc_unlck(state, cmd, request);
4922                 return 0;
4923         }
4924
4925         if (state == NULL)
4926                 return -ENOLCK;
4927         /*
4928          * Don't rely on the VFS having checked the file open mode,
4929          * since it won't do this for flock() locks.
4930          */
4931         switch (request->fl_type) {
4932         case F_RDLCK:
4933                 if (!(filp->f_mode & FMODE_READ))
4934                         return -EBADF;
4935                 break;
4936         case F_WRLCK:
4937                 if (!(filp->f_mode & FMODE_WRITE))
4938                         return -EBADF;
4939         }
4940
4941         do {
4942                 status = nfs4_proc_setlk(state, cmd, request);
4943                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4944                         break;
4945                 timeout = nfs4_set_lock_task_retry(timeout);
4946                 status = -ERESTARTSYS;
4947                 if (signalled())
4948                         break;
4949         } while(status < 0);
4950         return status;
4951 }
4952
4953 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4954 {
4955         struct nfs_server *server = NFS_SERVER(state->inode);
4956         struct nfs4_exception exception = { };
4957         int err;
4958
4959         err = nfs4_set_lock_state(state, fl);
4960         if (err != 0)
4961                 goto out;
4962         do {
4963                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4964                 switch (err) {
4965                         default:
4966                                 printk(KERN_ERR "NFS: %s: unhandled error "
4967                                         "%d.\n", __func__, err);
4968                         case 0:
4969                         case -ESTALE:
4970                                 goto out;
4971                         case -NFS4ERR_EXPIRED:
4972                                 nfs4_schedule_stateid_recovery(server, state);
4973                         case -NFS4ERR_STALE_CLIENTID:
4974                         case -NFS4ERR_STALE_STATEID:
4975                                 nfs4_schedule_lease_recovery(server->nfs_client);
4976                                 goto out;
4977                         case -NFS4ERR_BADSESSION:
4978                         case -NFS4ERR_BADSLOT:
4979                         case -NFS4ERR_BAD_HIGH_SLOT:
4980                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4981                         case -NFS4ERR_DEADSESSION:
4982                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4983                                 goto out;
4984                         case -ERESTARTSYS:
4985                                 /*
4986                                  * The show must go on: exit, but mark the
4987                                  * stateid as needing recovery.
4988                                  */
4989                         case -NFS4ERR_DELEG_REVOKED:
4990                         case -NFS4ERR_ADMIN_REVOKED:
4991                         case -NFS4ERR_BAD_STATEID:
4992                         case -NFS4ERR_OPENMODE:
4993                                 nfs4_schedule_stateid_recovery(server, state);
4994                                 err = 0;
4995                                 goto out;
4996                         case -EKEYEXPIRED:
4997                                 /*
4998                                  * User RPCSEC_GSS context has expired.
4999                                  * We cannot recover this stateid now, so
5000                                  * skip it and allow recovery thread to
5001                                  * proceed.
5002                                  */
5003                                 err = 0;
5004                                 goto out;
5005                         case -ENOMEM:
5006                         case -NFS4ERR_DENIED:
5007                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5008                                 err = 0;
5009                                 goto out;
5010                         case -NFS4ERR_DELAY:
5011                                 break;
5012                 }
5013                 err = nfs4_handle_exception(server, err, &exception);
5014         } while (exception.retry);
5015 out:
5016         return err;
5017 }
5018
5019 struct nfs_release_lockowner_data {
5020         struct nfs4_lock_state *lsp;
5021         struct nfs_server *server;
5022         struct nfs_release_lockowner_args args;
5023 };
5024
5025 static void nfs4_release_lockowner_release(void *calldata)
5026 {
5027         struct nfs_release_lockowner_data *data = calldata;
5028         nfs4_free_lock_state(data->server, data->lsp);
5029         kfree(calldata);
5030 }
5031
5032 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5033         .rpc_release = nfs4_release_lockowner_release,
5034 };
5035
5036 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5037 {
5038         struct nfs_server *server = lsp->ls_state->owner->so_server;
5039         struct nfs_release_lockowner_data *data;
5040         struct rpc_message msg = {
5041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5042         };
5043
5044         if (server->nfs_client->cl_mvops->minor_version != 0)
5045                 return -EINVAL;
5046         data = kmalloc(sizeof(*data), GFP_NOFS);
5047         if (!data)
5048                 return -ENOMEM;
5049         data->lsp = lsp;
5050         data->server = server;
5051         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5052         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5053         data->args.lock_owner.s_dev = server->s_dev;
5054         msg.rpc_argp = &data->args;
5055         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5056         return 0;
5057 }
5058
5059 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5060
5061 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5062                                    const void *buf, size_t buflen,
5063                                    int flags, int type)
5064 {
5065         if (strcmp(key, "") != 0)
5066                 return -EINVAL;
5067
5068         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5069 }
5070
5071 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5072                                    void *buf, size_t buflen, int type)
5073 {
5074         if (strcmp(key, "") != 0)
5075                 return -EINVAL;
5076
5077         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5078 }
5079
5080 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5081                                        size_t list_len, const char *name,
5082                                        size_t name_len, int type)
5083 {
5084         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5085
5086         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5087                 return 0;
5088
5089         if (list && len <= list_len)
5090                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5091         return len;
5092 }
5093
5094 /*
5095  * nfs_fhget will use either the mounted_on_fileid or the fileid
5096  */
5097 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5098 {
5099         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5100                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5101               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5102               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5103                 return;
5104
5105         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5106                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5107         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5108         fattr->nlink = 2;
5109 }
5110
5111 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5112                                    const struct qstr *name,
5113                                    struct nfs4_fs_locations *fs_locations,
5114                                    struct page *page)
5115 {
5116         struct nfs_server *server = NFS_SERVER(dir);
5117         u32 bitmask[2] = {
5118                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5119         };
5120         struct nfs4_fs_locations_arg args = {
5121                 .dir_fh = NFS_FH(dir),
5122                 .name = name,
5123                 .page = page,
5124                 .bitmask = bitmask,
5125         };
5126         struct nfs4_fs_locations_res res = {
5127                 .fs_locations = fs_locations,
5128         };
5129         struct rpc_message msg = {
5130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5131                 .rpc_argp = &args,
5132                 .rpc_resp = &res,
5133         };
5134         int status;
5135
5136         dprintk("%s: start\n", __func__);
5137
5138         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5139          * is not supported */
5140         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5141                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5142         else
5143                 bitmask[0] |= FATTR4_WORD0_FILEID;
5144
5145         nfs_fattr_init(&fs_locations->fattr);
5146         fs_locations->server = server;
5147         fs_locations->nlocations = 0;
5148         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5149         dprintk("%s: returned status = %d\n", __func__, status);
5150         return status;
5151 }
5152
5153 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5154                            const struct qstr *name,
5155                            struct nfs4_fs_locations *fs_locations,
5156                            struct page *page)
5157 {
5158         struct nfs4_exception exception = { };
5159         int err;
5160         do {
5161                 err = nfs4_handle_exception(NFS_SERVER(dir),
5162                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5163                                 &exception);
5164         } while (exception.retry);
5165         return err;
5166 }
5167
5168 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5169 {
5170         int status;
5171         struct nfs4_secinfo_arg args = {
5172                 .dir_fh = NFS_FH(dir),
5173                 .name   = name,
5174         };
5175         struct nfs4_secinfo_res res = {
5176                 .flavors     = flavors,
5177         };
5178         struct rpc_message msg = {
5179                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5180                 .rpc_argp = &args,
5181                 .rpc_resp = &res,
5182         };
5183
5184         dprintk("NFS call  secinfo %s\n", name->name);
5185         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5186         dprintk("NFS reply  secinfo: %d\n", status);
5187         return status;
5188 }
5189
5190 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5191                       struct nfs4_secinfo_flavors *flavors)
5192 {
5193         struct nfs4_exception exception = { };
5194         int err;
5195         do {
5196                 err = nfs4_handle_exception(NFS_SERVER(dir),
5197                                 _nfs4_proc_secinfo(dir, name, flavors),
5198                                 &exception);
5199         } while (exception.retry);
5200         return err;
5201 }
5202
5203 #ifdef CONFIG_NFS_V4_1
5204 /*
5205  * Check the exchange flags returned by the server for invalid flags, having
5206  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5207  * DS flags set.
5208  */
5209 static int nfs4_check_cl_exchange_flags(u32 flags)
5210 {
5211         if (flags & ~EXCHGID4_FLAG_MASK_R)
5212                 goto out_inval;
5213         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5214             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5215                 goto out_inval;
5216         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5217                 goto out_inval;
5218         return NFS_OK;
5219 out_inval:
5220         return -NFS4ERR_INVAL;
5221 }
5222
5223 static bool
5224 nfs41_same_server_scope(struct nfs41_server_scope *a,
5225                         struct nfs41_server_scope *b)
5226 {
5227         if (a->server_scope_sz == b->server_scope_sz &&
5228             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5229                 return true;
5230
5231         return false;
5232 }
5233
5234 /*
5235  * nfs4_proc_bind_conn_to_session()
5236  *
5237  * The 4.1 client currently uses the same TCP connection for the
5238  * fore and backchannel.
5239  */
5240 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5241 {
5242         int status;
5243         struct nfs41_bind_conn_to_session_res res;
5244         struct rpc_message msg = {
5245                 .rpc_proc =
5246                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5247                 .rpc_argp = clp,
5248                 .rpc_resp = &res,
5249                 .rpc_cred = cred,
5250         };
5251
5252         dprintk("--> %s\n", __func__);
5253
5254         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5255         if (unlikely(res.session == NULL)) {
5256                 status = -ENOMEM;
5257                 goto out;
5258         }
5259
5260         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5261         if (status == 0) {
5262                 if (memcmp(res.session->sess_id.data,
5263                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5264                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5265                         status = -EIO;
5266                         goto out_session;
5267                 }
5268                 if (res.dir != NFS4_CDFS4_BOTH) {
5269                         dprintk("NFS: %s: Unexpected direction from server\n",
5270                                 __func__);
5271                         status = -EIO;
5272                         goto out_session;
5273                 }
5274                 if (res.use_conn_in_rdma_mode) {
5275                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5276                                 __func__);
5277                         status = -EIO;
5278                         goto out_session;
5279                 }
5280         }
5281 out_session:
5282         kfree(res.session);
5283 out:
5284         dprintk("<-- %s status= %d\n", __func__, status);
5285         return status;
5286 }
5287
5288 /*
5289  * nfs4_proc_exchange_id()
5290  *
5291  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5292  *
5293  * Since the clientid has expired, all compounds using sessions
5294  * associated with the stale clientid will be returning
5295  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5296  * be in some phase of session reset.
5297  */
5298 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5299 {
5300         nfs4_verifier verifier;
5301         struct nfs41_exchange_id_args args = {
5302                 .verifier = &verifier,
5303                 .client = clp,
5304                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5305         };
5306         struct nfs41_exchange_id_res res = {
5307                 0
5308         };
5309         int status;
5310         struct rpc_message msg = {
5311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5312                 .rpc_argp = &args,
5313                 .rpc_resp = &res,
5314                 .rpc_cred = cred,
5315         };
5316
5317         nfs4_init_boot_verifier(clp, &verifier);
5318         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5319                                                         sizeof(args.id));
5320         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5321                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5322                 args.id_len, args.id);
5323
5324         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5325                                         GFP_NOFS);
5326         if (unlikely(res.server_owner == NULL)) {
5327                 status = -ENOMEM;
5328                 goto out;
5329         }
5330
5331         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5332                                         GFP_NOFS);
5333         if (unlikely(res.server_scope == NULL)) {
5334                 status = -ENOMEM;
5335                 goto out_server_owner;
5336         }
5337
5338         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5339         if (unlikely(res.impl_id == NULL)) {
5340                 status = -ENOMEM;
5341                 goto out_server_scope;
5342         }
5343
5344         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5345         if (status == 0)
5346                 status = nfs4_check_cl_exchange_flags(res.flags);
5347
5348         if (status == 0) {
5349                 clp->cl_clientid = res.clientid;
5350                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5351                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5352                         clp->cl_seqid = res.seqid;
5353
5354                 kfree(clp->cl_serverowner);
5355                 clp->cl_serverowner = res.server_owner;
5356                 res.server_owner = NULL;
5357
5358                 /* use the most recent implementation id */
5359                 kfree(clp->cl_implid);
5360                 clp->cl_implid = res.impl_id;
5361
5362                 if (clp->cl_serverscope != NULL &&
5363                     !nfs41_same_server_scope(clp->cl_serverscope,
5364                                              res.server_scope)) {
5365                         dprintk("%s: server_scope mismatch detected\n",
5366                                 __func__);
5367                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5368                         kfree(clp->cl_serverscope);
5369                         clp->cl_serverscope = NULL;
5370                 }
5371
5372                 if (clp->cl_serverscope == NULL) {
5373                         clp->cl_serverscope = res.server_scope;
5374                         goto out;
5375                 }
5376         } else
5377                 kfree(res.impl_id);
5378
5379 out_server_owner:
5380         kfree(res.server_owner);
5381 out_server_scope:
5382         kfree(res.server_scope);
5383 out:
5384         if (clp->cl_implid != NULL)
5385                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5386                         "domain: %s, name: %s, date: %llu,%u\n",
5387                         clp->cl_implid->domain, clp->cl_implid->name,
5388                         clp->cl_implid->date.seconds,
5389                         clp->cl_implid->date.nseconds);
5390         dprintk("NFS reply exchange_id: %d\n", status);
5391         return status;
5392 }
5393
5394 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5395                 struct rpc_cred *cred)
5396 {
5397         struct rpc_message msg = {
5398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5399                 .rpc_argp = clp,
5400                 .rpc_cred = cred,
5401         };
5402         int status;
5403
5404         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5405         if (status)
5406                 dprintk("NFS: Got error %d from the server %s on "
5407                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5408         return status;
5409 }
5410
5411 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5412                 struct rpc_cred *cred)
5413 {
5414         unsigned int loop;
5415         int ret;
5416
5417         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5418                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5419                 switch (ret) {
5420                 case -NFS4ERR_DELAY:
5421                 case -NFS4ERR_CLIENTID_BUSY:
5422                         ssleep(1);
5423                         break;
5424                 default:
5425                         return ret;
5426                 }
5427         }
5428         return 0;
5429 }
5430
5431 int nfs4_destroy_clientid(struct nfs_client *clp)
5432 {
5433         struct rpc_cred *cred;
5434         int ret = 0;
5435
5436         if (clp->cl_mvops->minor_version < 1)
5437                 goto out;
5438         if (clp->cl_exchange_flags == 0)
5439                 goto out;
5440         if (clp->cl_preserve_clid)
5441                 goto out;
5442         cred = nfs4_get_exchange_id_cred(clp);
5443         ret = nfs4_proc_destroy_clientid(clp, cred);
5444         if (cred)
5445                 put_rpccred(cred);
5446         switch (ret) {
5447         case 0:
5448         case -NFS4ERR_STALE_CLIENTID:
5449                 clp->cl_exchange_flags = 0;
5450         }
5451 out:
5452         return ret;
5453 }
5454
5455 struct nfs4_get_lease_time_data {
5456         struct nfs4_get_lease_time_args *args;
5457         struct nfs4_get_lease_time_res *res;
5458         struct nfs_client *clp;
5459 };
5460
5461 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5462                                         void *calldata)
5463 {
5464         int ret;
5465         struct nfs4_get_lease_time_data *data =
5466                         (struct nfs4_get_lease_time_data *)calldata;
5467
5468         dprintk("--> %s\n", __func__);
5469         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5470         /* just setup sequence, do not trigger session recovery
5471            since we're invoked within one */
5472         ret = nfs41_setup_sequence(data->clp->cl_session,
5473                                    &data->args->la_seq_args,
5474                                    &data->res->lr_seq_res, task);
5475
5476         if (ret != -EAGAIN)
5477                 rpc_call_start(task);
5478         dprintk("<-- %s\n", __func__);
5479 }
5480
5481 /*
5482  * Called from nfs4_state_manager thread for session setup, so don't recover
5483  * from sequence operation or clientid errors.
5484  */
5485 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5486 {
5487         struct nfs4_get_lease_time_data *data =
5488                         (struct nfs4_get_lease_time_data *)calldata;
5489
5490         dprintk("--> %s\n", __func__);
5491         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5492                 return;
5493         switch (task->tk_status) {
5494         case -NFS4ERR_DELAY:
5495         case -NFS4ERR_GRACE:
5496                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5497                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5498                 task->tk_status = 0;
5499                 /* fall through */
5500         case -NFS4ERR_RETRY_UNCACHED_REP:
5501                 rpc_restart_call_prepare(task);
5502                 return;
5503         }
5504         dprintk("<-- %s\n", __func__);
5505 }
5506
5507 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5508         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5509         .rpc_call_done = nfs4_get_lease_time_done,
5510 };
5511
5512 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5513 {
5514         struct rpc_task *task;
5515         struct nfs4_get_lease_time_args args;
5516         struct nfs4_get_lease_time_res res = {
5517                 .lr_fsinfo = fsinfo,
5518         };
5519         struct nfs4_get_lease_time_data data = {
5520                 .args = &args,
5521                 .res = &res,
5522                 .clp = clp,
5523         };
5524         struct rpc_message msg = {
5525                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5526                 .rpc_argp = &args,
5527                 .rpc_resp = &res,
5528         };
5529         struct rpc_task_setup task_setup = {
5530                 .rpc_client = clp->cl_rpcclient,
5531                 .rpc_message = &msg,
5532                 .callback_ops = &nfs4_get_lease_time_ops,
5533                 .callback_data = &data,
5534                 .flags = RPC_TASK_TIMEOUT,
5535         };
5536         int status;
5537
5538         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5539         dprintk("--> %s\n", __func__);
5540         task = rpc_run_task(&task_setup);
5541
5542         if (IS_ERR(task))
5543                 status = PTR_ERR(task);
5544         else {
5545                 status = task->tk_status;
5546                 rpc_put_task(task);
5547         }
5548         dprintk("<-- %s return %d\n", __func__, status);
5549
5550         return status;
5551 }
5552
5553 /*
5554  * Initialize the values to be used by the client in CREATE_SESSION
5555  * If nfs4_init_session set the fore channel request and response sizes,
5556  * use them.
5557  *
5558  * Set the back channel max_resp_sz_cached to zero to force the client to
5559  * always set csa_cachethis to FALSE because the current implementation
5560  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5561  */
5562 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5563 {
5564         struct nfs4_session *session = args->client->cl_session;
5565         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5566                      mxresp_sz = session->fc_target_max_resp_sz;
5567
5568         if (mxrqst_sz == 0)
5569                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5570         if (mxresp_sz == 0)
5571                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5572         /* Fore channel attributes */
5573         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5574         args->fc_attrs.max_resp_sz = mxresp_sz;
5575         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5576         args->fc_attrs.max_reqs = max_session_slots;
5577
5578         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5579                 "max_ops=%u max_reqs=%u\n",
5580                 __func__,
5581                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5582                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5583
5584         /* Back channel attributes */
5585         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5586         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5587         args->bc_attrs.max_resp_sz_cached = 0;
5588         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5589         args->bc_attrs.max_reqs = 1;
5590
5591         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5592                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5593                 __func__,
5594                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5595                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5596                 args->bc_attrs.max_reqs);
5597 }
5598
5599 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5600 {
5601         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5602         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5603
5604         if (rcvd->max_resp_sz > sent->max_resp_sz)
5605                 return -EINVAL;
5606         /*
5607          * Our requested max_ops is the minimum we need; we're not
5608          * prepared to break up compounds into smaller pieces than that.
5609          * So, no point even trying to continue if the server won't
5610          * cooperate:
5611          */
5612         if (rcvd->max_ops < sent->max_ops)
5613                 return -EINVAL;
5614         if (rcvd->max_reqs == 0)
5615                 return -EINVAL;
5616         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5617                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5618         return 0;
5619 }
5620
5621 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5622 {
5623         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5624         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5625
5626         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5627                 return -EINVAL;
5628         if (rcvd->max_resp_sz < sent->max_resp_sz)
5629                 return -EINVAL;
5630         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5631                 return -EINVAL;
5632         /* These would render the backchannel useless: */
5633         if (rcvd->max_ops != sent->max_ops)
5634                 return -EINVAL;
5635         if (rcvd->max_reqs != sent->max_reqs)
5636                 return -EINVAL;
5637         return 0;
5638 }
5639
5640 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5641                                      struct nfs4_session *session)
5642 {
5643         int ret;
5644
5645         ret = nfs4_verify_fore_channel_attrs(args, session);
5646         if (ret)
5647                 return ret;
5648         return nfs4_verify_back_channel_attrs(args, session);
5649 }
5650
5651 static int _nfs4_proc_create_session(struct nfs_client *clp,
5652                 struct rpc_cred *cred)
5653 {
5654         struct nfs4_session *session = clp->cl_session;
5655         struct nfs41_create_session_args args = {
5656                 .client = clp,
5657                 .cb_program = NFS4_CALLBACK,
5658         };
5659         struct nfs41_create_session_res res = {
5660                 .client = clp,
5661         };
5662         struct rpc_message msg = {
5663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5664                 .rpc_argp = &args,
5665                 .rpc_resp = &res,
5666                 .rpc_cred = cred,
5667         };
5668         int status;
5669
5670         nfs4_init_channel_attrs(&args);
5671         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5672
5673         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5674
5675         if (!status) {
5676                 /* Verify the session's negotiated channel_attrs values */
5677                 status = nfs4_verify_channel_attrs(&args, session);
5678                 /* Increment the clientid slot sequence id */
5679                 clp->cl_seqid++;
5680         }
5681
5682         return status;
5683 }
5684
5685 /*
5686  * Issues a CREATE_SESSION operation to the server.
5687  * It is the responsibility of the caller to verify the session is
5688  * expired before calling this routine.
5689  */
5690 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5691 {
5692         int status;
5693         unsigned *ptr;
5694         struct nfs4_session *session = clp->cl_session;
5695
5696         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5697
5698         status = _nfs4_proc_create_session(clp, cred);
5699         if (status)
5700                 goto out;
5701
5702         /* Init or reset the session slot tables */
5703         status = nfs4_setup_session_slot_tables(session);
5704         dprintk("slot table setup returned %d\n", status);
5705         if (status)
5706                 goto out;
5707
5708         ptr = (unsigned *)&session->sess_id.data[0];
5709         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5710                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5711 out:
5712         dprintk("<-- %s\n", __func__);
5713         return status;
5714 }
5715
5716 /*
5717  * Issue the over-the-wire RPC DESTROY_SESSION.
5718  * The caller must serialize access to this routine.
5719  */
5720 int nfs4_proc_destroy_session(struct nfs4_session *session,
5721                 struct rpc_cred *cred)
5722 {
5723         struct rpc_message msg = {
5724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5725                 .rpc_argp = session,
5726                 .rpc_cred = cred,
5727         };
5728         int status = 0;
5729
5730         dprintk("--> nfs4_proc_destroy_session\n");
5731
5732         /* session is still being setup */
5733         if (session->clp->cl_cons_state != NFS_CS_READY)
5734                 return status;
5735
5736         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5737
5738         if (status)
5739                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5740                         "Session has been destroyed regardless...\n", status);
5741
5742         dprintk("<-- nfs4_proc_destroy_session\n");
5743         return status;
5744 }
5745
5746 /*
5747  * Renew the cl_session lease.
5748  */
5749 struct nfs4_sequence_data {
5750         struct nfs_client *clp;
5751         struct nfs4_sequence_args args;
5752         struct nfs4_sequence_res res;
5753 };
5754
5755 static void nfs41_sequence_release(void *data)
5756 {
5757         struct nfs4_sequence_data *calldata = data;
5758         struct nfs_client *clp = calldata->clp;
5759
5760         if (atomic_read(&clp->cl_count) > 1)
5761                 nfs4_schedule_state_renewal(clp);
5762         nfs_put_client(clp);
5763         kfree(calldata);
5764 }
5765
5766 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5767 {
5768         switch(task->tk_status) {
5769         case -NFS4ERR_DELAY:
5770                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5771                 return -EAGAIN;
5772         default:
5773                 nfs4_schedule_lease_recovery(clp);
5774         }
5775         return 0;
5776 }
5777
5778 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5779 {
5780         struct nfs4_sequence_data *calldata = data;
5781         struct nfs_client *clp = calldata->clp;
5782
5783         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5784                 return;
5785
5786         if (task->tk_status < 0) {
5787                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5788                 if (atomic_read(&clp->cl_count) == 1)
5789                         goto out;
5790
5791                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5792                         rpc_restart_call_prepare(task);
5793                         return;
5794                 }
5795         }
5796         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5797 out:
5798         dprintk("<-- %s\n", __func__);
5799 }
5800
5801 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5802 {
5803         struct nfs4_sequence_data *calldata = data;
5804         struct nfs_client *clp = calldata->clp;
5805         struct nfs4_sequence_args *args;
5806         struct nfs4_sequence_res *res;
5807
5808         args = task->tk_msg.rpc_argp;
5809         res = task->tk_msg.rpc_resp;
5810
5811         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5812                 return;
5813         rpc_call_start(task);
5814 }
5815
5816 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5817 {
5818         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5819         nfs41_sequence_prepare(task, data);
5820 }
5821
5822 static const struct rpc_call_ops nfs41_sequence_ops = {
5823         .rpc_call_done = nfs41_sequence_call_done,
5824         .rpc_call_prepare = nfs41_sequence_prepare,
5825         .rpc_release = nfs41_sequence_release,
5826 };
5827
5828 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5829         .rpc_call_done = nfs41_sequence_call_done,
5830         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5831         .rpc_release = nfs41_sequence_release,
5832 };
5833
5834 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5835                                              const struct rpc_call_ops *seq_ops)
5836 {
5837         struct nfs4_sequence_data *calldata;
5838         struct rpc_message msg = {
5839                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5840                 .rpc_cred = cred,
5841         };
5842         struct rpc_task_setup task_setup_data = {
5843                 .rpc_client = clp->cl_rpcclient,
5844                 .rpc_message = &msg,
5845                 .callback_ops = seq_ops,
5846                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5847         };
5848
5849         if (!atomic_inc_not_zero(&clp->cl_count))
5850                 return ERR_PTR(-EIO);
5851         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5852         if (calldata == NULL) {
5853                 nfs_put_client(clp);
5854                 return ERR_PTR(-ENOMEM);
5855         }
5856         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5857         msg.rpc_argp = &calldata->args;
5858         msg.rpc_resp = &calldata->res;
5859         calldata->clp = clp;
5860         task_setup_data.callback_data = calldata;
5861
5862         return rpc_run_task(&task_setup_data);
5863 }
5864
5865 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5866 {
5867         struct rpc_task *task;
5868         int ret = 0;
5869
5870         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5871                 return 0;
5872         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5873         if (IS_ERR(task))
5874                 ret = PTR_ERR(task);
5875         else
5876                 rpc_put_task_async(task);
5877         dprintk("<-- %s status=%d\n", __func__, ret);
5878         return ret;
5879 }
5880
5881 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5882 {
5883         struct rpc_task *task;
5884         int ret;
5885
5886         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5887         if (IS_ERR(task)) {
5888                 ret = PTR_ERR(task);
5889                 goto out;
5890         }
5891         ret = rpc_wait_for_completion_task(task);
5892         if (!ret) {
5893                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5894
5895                 if (task->tk_status == 0)
5896                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5897                 ret = task->tk_status;
5898         }
5899         rpc_put_task(task);
5900 out:
5901         dprintk("<-- %s status=%d\n", __func__, ret);
5902         return ret;
5903 }
5904
5905 struct nfs4_reclaim_complete_data {
5906         struct nfs_client *clp;
5907         struct nfs41_reclaim_complete_args arg;
5908         struct nfs41_reclaim_complete_res res;
5909 };
5910
5911 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5912 {
5913         struct nfs4_reclaim_complete_data *calldata = data;
5914
5915         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5916         if (nfs41_setup_sequence(calldata->clp->cl_session,
5917                                 &calldata->arg.seq_args,
5918                                 &calldata->res.seq_res, task))
5919                 return;
5920
5921         rpc_call_start(task);
5922 }
5923
5924 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5925 {
5926         switch(task->tk_status) {
5927         case 0:
5928         case -NFS4ERR_COMPLETE_ALREADY:
5929         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5930                 break;
5931         case -NFS4ERR_DELAY:
5932                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5933                 /* fall through */
5934         case -NFS4ERR_RETRY_UNCACHED_REP:
5935                 return -EAGAIN;
5936         default:
5937                 nfs4_schedule_lease_recovery(clp);
5938         }
5939         return 0;
5940 }
5941
5942 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5943 {
5944         struct nfs4_reclaim_complete_data *calldata = data;
5945         struct nfs_client *clp = calldata->clp;
5946         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5947
5948         dprintk("--> %s\n", __func__);
5949         if (!nfs41_sequence_done(task, res))
5950                 return;
5951
5952         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5953                 rpc_restart_call_prepare(task);
5954                 return;
5955         }
5956         dprintk("<-- %s\n", __func__);
5957 }
5958
5959 static void nfs4_free_reclaim_complete_data(void *data)
5960 {
5961         struct nfs4_reclaim_complete_data *calldata = data;
5962
5963         kfree(calldata);
5964 }
5965
5966 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5967         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5968         .rpc_call_done = nfs4_reclaim_complete_done,
5969         .rpc_release = nfs4_free_reclaim_complete_data,
5970 };
5971
5972 /*
5973  * Issue a global reclaim complete.
5974  */
5975 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5976 {
5977         struct nfs4_reclaim_complete_data *calldata;
5978         struct rpc_task *task;
5979         struct rpc_message msg = {
5980                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5981         };
5982         struct rpc_task_setup task_setup_data = {
5983                 .rpc_client = clp->cl_rpcclient,
5984                 .rpc_message = &msg,
5985                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5986                 .flags = RPC_TASK_ASYNC,
5987         };
5988         int status = -ENOMEM;
5989
5990         dprintk("--> %s\n", __func__);
5991         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5992         if (calldata == NULL)
5993                 goto out;
5994         calldata->clp = clp;
5995         calldata->arg.one_fs = 0;
5996
5997         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5998         msg.rpc_argp = &calldata->arg;
5999         msg.rpc_resp = &calldata->res;
6000         task_setup_data.callback_data = calldata;
6001         task = rpc_run_task(&task_setup_data);
6002         if (IS_ERR(task)) {
6003                 status = PTR_ERR(task);
6004                 goto out;
6005         }
6006         status = nfs4_wait_for_completion_rpc_task(task);
6007         if (status == 0)
6008                 status = task->tk_status;
6009         rpc_put_task(task);
6010         return 0;
6011 out:
6012         dprintk("<-- %s status=%d\n", __func__, status);
6013         return status;
6014 }
6015
6016 static void
6017 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6018 {
6019         struct nfs4_layoutget *lgp = calldata;
6020         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6021
6022         dprintk("--> %s\n", __func__);
6023         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6024          * right now covering the LAYOUTGET we are about to send.
6025          * However, that is not so catastrophic, and there seems
6026          * to be no way to prevent it completely.
6027          */
6028         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6029                                 &lgp->res.seq_res, task))
6030                 return;
6031         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6032                                           NFS_I(lgp->args.inode)->layout,
6033                                           lgp->args.ctx->state)) {
6034                 rpc_exit(task, NFS4_OK);
6035                 return;
6036         }
6037         rpc_call_start(task);
6038 }
6039
6040 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6041 {
6042         struct nfs4_layoutget *lgp = calldata;
6043         struct inode *inode = lgp->args.inode;
6044         struct nfs_server *server = NFS_SERVER(inode);
6045         struct pnfs_layout_hdr *lo;
6046         struct nfs4_state *state = NULL;
6047
6048         dprintk("--> %s\n", __func__);
6049
6050         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6051                 goto out;
6052
6053         switch (task->tk_status) {
6054         case 0:
6055                 goto out;
6056         case -NFS4ERR_LAYOUTTRYLATER:
6057         case -NFS4ERR_RECALLCONFLICT:
6058                 task->tk_status = -NFS4ERR_DELAY;
6059                 break;
6060         case -NFS4ERR_EXPIRED:
6061         case -NFS4ERR_BAD_STATEID:
6062                 spin_lock(&inode->i_lock);
6063                 lo = NFS_I(inode)->layout;
6064                 if (!lo || list_empty(&lo->plh_segs)) {
6065                         spin_unlock(&inode->i_lock);
6066                         /* If the open stateid was bad, then recover it. */
6067                         state = lgp->args.ctx->state;
6068                 } else {
6069                         LIST_HEAD(head);
6070
6071                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6072                         spin_unlock(&inode->i_lock);
6073                         /* Mark the bad layout state as invalid, then
6074                          * retry using the open stateid. */
6075                         pnfs_free_lseg_list(&head);
6076                 }
6077         }
6078         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6079                 rpc_restart_call_prepare(task);
6080 out:
6081         dprintk("<-- %s\n", __func__);
6082 }
6083
6084 static size_t max_response_pages(struct nfs_server *server)
6085 {
6086         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6087         return nfs_page_array_len(0, max_resp_sz);
6088 }
6089
6090 static void nfs4_free_pages(struct page **pages, size_t size)
6091 {
6092         int i;
6093
6094         if (!pages)
6095                 return;
6096
6097         for (i = 0; i < size; i++) {
6098                 if (!pages[i])
6099                         break;
6100                 __free_page(pages[i]);
6101         }
6102         kfree(pages);
6103 }
6104
6105 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6106 {
6107         struct page **pages;
6108         int i;
6109
6110         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6111         if (!pages) {
6112                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6113                 return NULL;
6114         }
6115
6116         for (i = 0; i < size; i++) {
6117                 pages[i] = alloc_page(gfp_flags);
6118                 if (!pages[i]) {
6119                         dprintk("%s: failed to allocate page\n", __func__);
6120                         nfs4_free_pages(pages, size);
6121                         return NULL;
6122                 }
6123         }
6124
6125         return pages;
6126 }
6127
6128 static void nfs4_layoutget_release(void *calldata)
6129 {
6130         struct nfs4_layoutget *lgp = calldata;
6131         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6132         size_t max_pages = max_response_pages(server);
6133
6134         dprintk("--> %s\n", __func__);
6135         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6136         put_nfs_open_context(lgp->args.ctx);
6137         kfree(calldata);
6138         dprintk("<-- %s\n", __func__);
6139 }
6140
6141 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6142         .rpc_call_prepare = nfs4_layoutget_prepare,
6143         .rpc_call_done = nfs4_layoutget_done,
6144         .rpc_release = nfs4_layoutget_release,
6145 };
6146
6147 struct pnfs_layout_segment *
6148 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6149 {
6150         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6151         size_t max_pages = max_response_pages(server);
6152         struct rpc_task *task;
6153         struct rpc_message msg = {
6154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6155                 .rpc_argp = &lgp->args,
6156                 .rpc_resp = &lgp->res,
6157         };
6158         struct rpc_task_setup task_setup_data = {
6159                 .rpc_client = server->client,
6160                 .rpc_message = &msg,
6161                 .callback_ops = &nfs4_layoutget_call_ops,
6162                 .callback_data = lgp,
6163                 .flags = RPC_TASK_ASYNC,
6164         };
6165         struct pnfs_layout_segment *lseg = NULL;
6166         int status = 0;
6167
6168         dprintk("--> %s\n", __func__);
6169
6170         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6171         if (!lgp->args.layout.pages) {
6172                 nfs4_layoutget_release(lgp);
6173                 return ERR_PTR(-ENOMEM);
6174         }
6175         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6176
6177         lgp->res.layoutp = &lgp->args.layout;
6178         lgp->res.seq_res.sr_slot = NULL;
6179         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6180         task = rpc_run_task(&task_setup_data);
6181         if (IS_ERR(task))
6182                 return ERR_CAST(task);
6183         status = nfs4_wait_for_completion_rpc_task(task);
6184         if (status == 0)
6185                 status = task->tk_status;
6186         if (status == 0)
6187                 lseg = pnfs_layout_process(lgp);
6188         rpc_put_task(task);
6189         dprintk("<-- %s status=%d\n", __func__, status);
6190         if (status)
6191                 return ERR_PTR(status);
6192         return lseg;
6193 }
6194
6195 static void
6196 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6197 {
6198         struct nfs4_layoutreturn *lrp = calldata;
6199
6200         dprintk("--> %s\n", __func__);
6201         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6202                                 &lrp->res.seq_res, task))
6203                 return;
6204         rpc_call_start(task);
6205 }
6206
6207 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6208 {
6209         struct nfs4_layoutreturn *lrp = calldata;
6210         struct nfs_server *server;
6211
6212         dprintk("--> %s\n", __func__);
6213
6214         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6215                 return;
6216
6217         server = NFS_SERVER(lrp->args.inode);
6218         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6219                 rpc_restart_call_prepare(task);
6220                 return;
6221         }
6222         dprintk("<-- %s\n", __func__);
6223 }
6224
6225 static void nfs4_layoutreturn_release(void *calldata)
6226 {
6227         struct nfs4_layoutreturn *lrp = calldata;
6228         struct pnfs_layout_hdr *lo = lrp->args.layout;
6229
6230         dprintk("--> %s\n", __func__);
6231         spin_lock(&lo->plh_inode->i_lock);
6232         if (lrp->res.lrs_present)
6233                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6234         lo->plh_block_lgets--;
6235         spin_unlock(&lo->plh_inode->i_lock);
6236         pnfs_put_layout_hdr(lrp->args.layout);
6237         kfree(calldata);
6238         dprintk("<-- %s\n", __func__);
6239 }
6240
6241 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6242         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6243         .rpc_call_done = nfs4_layoutreturn_done,
6244         .rpc_release = nfs4_layoutreturn_release,
6245 };
6246
6247 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6248 {
6249         struct rpc_task *task;
6250         struct rpc_message msg = {
6251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6252                 .rpc_argp = &lrp->args,
6253                 .rpc_resp = &lrp->res,
6254         };
6255         struct rpc_task_setup task_setup_data = {
6256                 .rpc_client = lrp->clp->cl_rpcclient,
6257                 .rpc_message = &msg,
6258                 .callback_ops = &nfs4_layoutreturn_call_ops,
6259                 .callback_data = lrp,
6260         };
6261         int status;
6262
6263         dprintk("--> %s\n", __func__);
6264         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6265         task = rpc_run_task(&task_setup_data);
6266         if (IS_ERR(task))
6267                 return PTR_ERR(task);
6268         status = task->tk_status;
6269         dprintk("<-- %s status=%d\n", __func__, status);
6270         rpc_put_task(task);
6271         return status;
6272 }
6273
6274 /*
6275  * Retrieve the list of Data Server devices from the MDS.
6276  */
6277 static int _nfs4_getdevicelist(struct nfs_server *server,
6278                                     const struct nfs_fh *fh,
6279                                     struct pnfs_devicelist *devlist)
6280 {
6281         struct nfs4_getdevicelist_args args = {
6282                 .fh = fh,
6283                 .layoutclass = server->pnfs_curr_ld->id,
6284         };
6285         struct nfs4_getdevicelist_res res = {
6286                 .devlist = devlist,
6287         };
6288         struct rpc_message msg = {
6289                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6290                 .rpc_argp = &args,
6291                 .rpc_resp = &res,
6292         };
6293         int status;
6294
6295         dprintk("--> %s\n", __func__);
6296         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6297                                 &res.seq_res, 0);
6298         dprintk("<-- %s status=%d\n", __func__, status);
6299         return status;
6300 }
6301
6302 int nfs4_proc_getdevicelist(struct nfs_server *server,
6303                             const struct nfs_fh *fh,
6304                             struct pnfs_devicelist *devlist)
6305 {
6306         struct nfs4_exception exception = { };
6307         int err;
6308
6309         do {
6310                 err = nfs4_handle_exception(server,
6311                                 _nfs4_getdevicelist(server, fh, devlist),
6312                                 &exception);
6313         } while (exception.retry);
6314
6315         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6316                 err, devlist->num_devs);
6317
6318         return err;
6319 }
6320 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6321
6322 static int
6323 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6324 {
6325         struct nfs4_getdeviceinfo_args args = {
6326                 .pdev = pdev,
6327         };
6328         struct nfs4_getdeviceinfo_res res = {
6329                 .pdev = pdev,
6330         };
6331         struct rpc_message msg = {
6332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6333                 .rpc_argp = &args,
6334                 .rpc_resp = &res,
6335         };
6336         int status;
6337
6338         dprintk("--> %s\n", __func__);
6339         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6340         dprintk("<-- %s status=%d\n", __func__, status);
6341
6342         return status;
6343 }
6344
6345 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6346 {
6347         struct nfs4_exception exception = { };
6348         int err;
6349
6350         do {
6351                 err = nfs4_handle_exception(server,
6352                                         _nfs4_proc_getdeviceinfo(server, pdev),
6353                                         &exception);
6354         } while (exception.retry);
6355         return err;
6356 }
6357 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6358
6359 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6360 {
6361         struct nfs4_layoutcommit_data *data = calldata;
6362         struct nfs_server *server = NFS_SERVER(data->args.inode);
6363
6364         if (nfs4_setup_sequence(server, &data->args.seq_args,
6365                                 &data->res.seq_res, task))
6366                 return;
6367         rpc_call_start(task);
6368 }
6369
6370 static void
6371 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6372 {
6373         struct nfs4_layoutcommit_data *data = calldata;
6374         struct nfs_server *server = NFS_SERVER(data->args.inode);
6375
6376         if (!nfs4_sequence_done(task, &data->res.seq_res))
6377                 return;
6378
6379         switch (task->tk_status) { /* Just ignore these failures */
6380         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6381         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6382         case -NFS4ERR_BADLAYOUT:     /* no layout */
6383         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6384                 task->tk_status = 0;
6385                 break;
6386         case 0:
6387                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6388                                                    data->res.fattr);
6389                 break;
6390         default:
6391                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6392                         rpc_restart_call_prepare(task);
6393                         return;
6394                 }
6395         }
6396 }
6397
6398 static void nfs4_layoutcommit_release(void *calldata)
6399 {
6400         struct nfs4_layoutcommit_data *data = calldata;
6401         struct pnfs_layout_segment *lseg, *tmp;
6402         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6403
6404         pnfs_cleanup_layoutcommit(data);
6405         /* Matched by references in pnfs_set_layoutcommit */
6406         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6407                 list_del_init(&lseg->pls_lc_list);
6408                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6409                                        &lseg->pls_flags))
6410                         pnfs_put_lseg(lseg);
6411         }
6412
6413         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6414         smp_mb__after_clear_bit();
6415         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6416
6417         put_rpccred(data->cred);
6418         kfree(data);
6419 }
6420
6421 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6422         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6423         .rpc_call_done = nfs4_layoutcommit_done,
6424         .rpc_release = nfs4_layoutcommit_release,
6425 };
6426
6427 int
6428 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6429 {
6430         struct rpc_message msg = {
6431                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6432                 .rpc_argp = &data->args,
6433                 .rpc_resp = &data->res,
6434                 .rpc_cred = data->cred,
6435         };
6436         struct rpc_task_setup task_setup_data = {
6437                 .task = &data->task,
6438                 .rpc_client = NFS_CLIENT(data->args.inode),
6439                 .rpc_message = &msg,
6440                 .callback_ops = &nfs4_layoutcommit_ops,
6441                 .callback_data = data,
6442                 .flags = RPC_TASK_ASYNC,
6443         };
6444         struct rpc_task *task;
6445         int status = 0;
6446
6447         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6448                 "lbw: %llu inode %lu\n",
6449                 data->task.tk_pid, sync,
6450                 data->args.lastbytewritten,
6451                 data->args.inode->i_ino);
6452
6453         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6454         task = rpc_run_task(&task_setup_data);
6455         if (IS_ERR(task))
6456                 return PTR_ERR(task);
6457         if (sync == false)
6458                 goto out;
6459         status = nfs4_wait_for_completion_rpc_task(task);
6460         if (status != 0)
6461                 goto out;
6462         status = task->tk_status;
6463 out:
6464         dprintk("%s: status %d\n", __func__, status);
6465         rpc_put_task(task);
6466         return status;
6467 }
6468
6469 static int
6470 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6471                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6472 {
6473         struct nfs41_secinfo_no_name_args args = {
6474                 .style = SECINFO_STYLE_CURRENT_FH,
6475         };
6476         struct nfs4_secinfo_res res = {
6477                 .flavors = flavors,
6478         };
6479         struct rpc_message msg = {
6480                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6481                 .rpc_argp = &args,
6482                 .rpc_resp = &res,
6483         };
6484         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6485 }
6486
6487 static int
6488 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6489                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6490 {
6491         struct nfs4_exception exception = { };
6492         int err;
6493         do {
6494                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6495                 switch (err) {
6496                 case 0:
6497                 case -NFS4ERR_WRONGSEC:
6498                 case -NFS4ERR_NOTSUPP:
6499                         goto out;
6500                 default:
6501                         err = nfs4_handle_exception(server, err, &exception);
6502                 }
6503         } while (exception.retry);
6504 out:
6505         return err;
6506 }
6507
6508 static int
6509 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6510                     struct nfs_fsinfo *info)
6511 {
6512         int err;
6513         struct page *page;
6514         rpc_authflavor_t flavor;
6515         struct nfs4_secinfo_flavors *flavors;
6516
6517         page = alloc_page(GFP_KERNEL);
6518         if (!page) {
6519                 err = -ENOMEM;
6520                 goto out;
6521         }
6522
6523         flavors = page_address(page);
6524         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6525
6526         /*
6527          * Fall back on "guess and check" method if
6528          * the server doesn't support SECINFO_NO_NAME
6529          */
6530         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6531                 err = nfs4_find_root_sec(server, fhandle, info);
6532                 goto out_freepage;
6533         }
6534         if (err)
6535                 goto out_freepage;
6536
6537         flavor = nfs_find_best_sec(flavors);
6538         if (err == 0)
6539                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6540
6541 out_freepage:
6542         put_page(page);
6543         if (err == -EACCES)
6544                 return -EPERM;
6545 out:
6546         return err;
6547 }
6548
6549 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6550 {
6551         int status;
6552         struct nfs41_test_stateid_args args = {
6553                 .stateid = stateid,
6554         };
6555         struct nfs41_test_stateid_res res;
6556         struct rpc_message msg = {
6557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6558                 .rpc_argp = &args,
6559                 .rpc_resp = &res,
6560         };
6561
6562         dprintk("NFS call  test_stateid %p\n", stateid);
6563         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6564         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6565         if (status != NFS_OK) {
6566                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6567                 return status;
6568         }
6569         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6570         return -res.status;
6571 }
6572
6573 /**
6574  * nfs41_test_stateid - perform a TEST_STATEID operation
6575  *
6576  * @server: server / transport on which to perform the operation
6577  * @stateid: state ID to test
6578  *
6579  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6580  * Otherwise a negative NFS4ERR value is returned if the operation
6581  * failed or the state ID is not currently valid.
6582  */
6583 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6584 {
6585         struct nfs4_exception exception = { };
6586         int err;
6587         do {
6588                 err = _nfs41_test_stateid(server, stateid);
6589                 if (err != -NFS4ERR_DELAY)
6590                         break;
6591                 nfs4_handle_exception(server, err, &exception);
6592         } while (exception.retry);
6593         return err;
6594 }
6595
6596 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6597 {
6598         struct nfs41_free_stateid_args args = {
6599                 .stateid = stateid,
6600         };
6601         struct nfs41_free_stateid_res res;
6602         struct rpc_message msg = {
6603                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6604                 .rpc_argp = &args,
6605                 .rpc_resp = &res,
6606         };
6607         int status;
6608
6609         dprintk("NFS call  free_stateid %p\n", stateid);
6610         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6611         status = nfs4_call_sync_sequence(server->client, server, &msg,
6612                                          &args.seq_args, &res.seq_res, 1);
6613         dprintk("NFS reply free_stateid: %d\n", status);
6614         return status;
6615 }
6616
6617 /**
6618  * nfs41_free_stateid - perform a FREE_STATEID operation
6619  *
6620  * @server: server / transport on which to perform the operation
6621  * @stateid: state ID to release
6622  *
6623  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6624  * negative NFS4ERR value is returned.
6625  */
6626 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6627 {
6628         struct nfs4_exception exception = { };
6629         int err;
6630         do {
6631                 err = _nfs4_free_stateid(server, stateid);
6632                 if (err != -NFS4ERR_DELAY)
6633                         break;
6634                 nfs4_handle_exception(server, err, &exception);
6635         } while (exception.retry);
6636         return err;
6637 }
6638
6639 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6640                 const nfs4_stateid *s2)
6641 {
6642         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6643                 return false;
6644
6645         if (s1->seqid == s2->seqid)
6646                 return true;
6647         if (s1->seqid == 0 || s2->seqid == 0)
6648                 return true;
6649
6650         return false;
6651 }
6652
6653 #endif /* CONFIG_NFS_V4_1 */
6654
6655 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6656                 const nfs4_stateid *s2)
6657 {
6658         return nfs4_stateid_match(s1, s2);
6659 }
6660
6661
6662 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6663         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6664         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6665         .recover_open   = nfs4_open_reclaim,
6666         .recover_lock   = nfs4_lock_reclaim,
6667         .establish_clid = nfs4_init_clientid,
6668         .get_clid_cred  = nfs4_get_setclientid_cred,
6669         .detect_trunking = nfs40_discover_server_trunking,
6670 };
6671
6672 #if defined(CONFIG_NFS_V4_1)
6673 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6674         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6675         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6676         .recover_open   = nfs4_open_reclaim,
6677         .recover_lock   = nfs4_lock_reclaim,
6678         .establish_clid = nfs41_init_clientid,
6679         .get_clid_cred  = nfs4_get_exchange_id_cred,
6680         .reclaim_complete = nfs41_proc_reclaim_complete,
6681         .detect_trunking = nfs41_discover_server_trunking,
6682 };
6683 #endif /* CONFIG_NFS_V4_1 */
6684
6685 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6686         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6687         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6688         .recover_open   = nfs4_open_expired,
6689         .recover_lock   = nfs4_lock_expired,
6690         .establish_clid = nfs4_init_clientid,
6691         .get_clid_cred  = nfs4_get_setclientid_cred,
6692 };
6693
6694 #if defined(CONFIG_NFS_V4_1)
6695 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6696         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6697         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6698         .recover_open   = nfs41_open_expired,
6699         .recover_lock   = nfs41_lock_expired,
6700         .establish_clid = nfs41_init_clientid,
6701         .get_clid_cred  = nfs4_get_exchange_id_cred,
6702 };
6703 #endif /* CONFIG_NFS_V4_1 */
6704
6705 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6706         .sched_state_renewal = nfs4_proc_async_renew,
6707         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6708         .renew_lease = nfs4_proc_renew,
6709 };
6710
6711 #if defined(CONFIG_NFS_V4_1)
6712 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6713         .sched_state_renewal = nfs41_proc_async_sequence,
6714         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6715         .renew_lease = nfs4_proc_sequence,
6716 };
6717 #endif
6718
6719 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6720         .minor_version = 0,
6721         .call_sync = _nfs4_call_sync,
6722         .match_stateid = nfs4_match_stateid,
6723         .find_root_sec = nfs4_find_root_sec,
6724         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6725         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6726         .state_renewal_ops = &nfs40_state_renewal_ops,
6727 };
6728
6729 #if defined(CONFIG_NFS_V4_1)
6730 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6731         .minor_version = 1,
6732         .call_sync = _nfs4_call_sync_session,
6733         .match_stateid = nfs41_match_stateid,
6734         .find_root_sec = nfs41_find_root_sec,
6735         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6736         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6737         .state_renewal_ops = &nfs41_state_renewal_ops,
6738 };
6739 #endif
6740
6741 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6742         [0] = &nfs_v4_0_minor_ops,
6743 #if defined(CONFIG_NFS_V4_1)
6744         [1] = &nfs_v4_1_minor_ops,
6745 #endif
6746 };
6747
6748 const struct inode_operations nfs4_dir_inode_operations = {
6749         .create         = nfs_create,
6750         .lookup         = nfs_lookup,
6751         .atomic_open    = nfs_atomic_open,
6752         .link           = nfs_link,
6753         .unlink         = nfs_unlink,
6754         .symlink        = nfs_symlink,
6755         .mkdir          = nfs_mkdir,
6756         .rmdir          = nfs_rmdir,
6757         .mknod          = nfs_mknod,
6758         .rename         = nfs_rename,
6759         .permission     = nfs_permission,
6760         .getattr        = nfs_getattr,
6761         .setattr        = nfs_setattr,
6762         .getxattr       = generic_getxattr,
6763         .setxattr       = generic_setxattr,
6764         .listxattr      = generic_listxattr,
6765         .removexattr    = generic_removexattr,
6766 };
6767
6768 static const struct inode_operations nfs4_file_inode_operations = {
6769         .permission     = nfs_permission,
6770         .getattr        = nfs_getattr,
6771         .setattr        = nfs_setattr,
6772         .getxattr       = generic_getxattr,
6773         .setxattr       = generic_setxattr,
6774         .listxattr      = generic_listxattr,
6775         .removexattr    = generic_removexattr,
6776 };
6777
6778 const struct nfs_rpc_ops nfs_v4_clientops = {
6779         .version        = 4,                    /* protocol version */
6780         .dentry_ops     = &nfs4_dentry_operations,
6781         .dir_inode_ops  = &nfs4_dir_inode_operations,
6782         .file_inode_ops = &nfs4_file_inode_operations,
6783         .file_ops       = &nfs4_file_operations,
6784         .getroot        = nfs4_proc_get_root,
6785         .submount       = nfs4_submount,
6786         .try_mount      = nfs4_try_mount,
6787         .getattr        = nfs4_proc_getattr,
6788         .setattr        = nfs4_proc_setattr,
6789         .lookup         = nfs4_proc_lookup,
6790         .access         = nfs4_proc_access,
6791         .readlink       = nfs4_proc_readlink,
6792         .create         = nfs4_proc_create,
6793         .remove         = nfs4_proc_remove,
6794         .unlink_setup   = nfs4_proc_unlink_setup,
6795         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6796         .unlink_done    = nfs4_proc_unlink_done,
6797         .rename         = nfs4_proc_rename,
6798         .rename_setup   = nfs4_proc_rename_setup,
6799         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6800         .rename_done    = nfs4_proc_rename_done,
6801         .link           = nfs4_proc_link,
6802         .symlink        = nfs4_proc_symlink,
6803         .mkdir          = nfs4_proc_mkdir,
6804         .rmdir          = nfs4_proc_remove,
6805         .readdir        = nfs4_proc_readdir,
6806         .mknod          = nfs4_proc_mknod,
6807         .statfs         = nfs4_proc_statfs,
6808         .fsinfo         = nfs4_proc_fsinfo,
6809         .pathconf       = nfs4_proc_pathconf,
6810         .set_capabilities = nfs4_server_capabilities,
6811         .decode_dirent  = nfs4_decode_dirent,
6812         .read_setup     = nfs4_proc_read_setup,
6813         .read_pageio_init = pnfs_pageio_init_read,
6814         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6815         .read_done      = nfs4_read_done,
6816         .write_setup    = nfs4_proc_write_setup,
6817         .write_pageio_init = pnfs_pageio_init_write,
6818         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6819         .write_done     = nfs4_write_done,
6820         .commit_setup   = nfs4_proc_commit_setup,
6821         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6822         .commit_done    = nfs4_commit_done,
6823         .lock           = nfs4_proc_lock,
6824         .clear_acl_cache = nfs4_zap_acl_attr,
6825         .close_context  = nfs4_close_context,
6826         .open_context   = nfs4_atomic_open,
6827         .have_delegation = nfs4_have_delegation,
6828         .return_delegation = nfs4_inode_return_delegation,
6829         .alloc_client   = nfs4_alloc_client,
6830         .init_client    = nfs4_init_client,
6831         .free_client    = nfs4_free_client,
6832         .create_server  = nfs4_create_server,
6833         .clone_server   = nfs_clone_server,
6834 };
6835
6836 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6837         .prefix = XATTR_NAME_NFSV4_ACL,
6838         .list   = nfs4_xattr_list_nfs4_acl,
6839         .get    = nfs4_xattr_get_nfs4_acl,
6840         .set    = nfs4_xattr_set_nfs4_acl,
6841 };
6842
6843 const struct xattr_handler *nfs4_xattr_handlers[] = {
6844         &nfs4_xattr_nfs4_acl_handler,
6845         NULL
6846 };
6847
6848 /*
6849  * Local variables:
6850  *  c-basic-offset: 8
6851  * End:
6852  */