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/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  74                             struct nfs_fattr *fattr, struct iattr *sattr,
  75                             struct nfs4_state *state);
  76
  77 /* Prevent leaks of NFSv4 errors into userland */
  78 static int nfs4_map_errors(int err)
  79 {
  80         if (err >= -1000)
  81                 return err;
  82         switch (err) {
  83         case -NFS4ERR_RESOURCE:
  84                 return -EREMOTEIO;
  85         default:
  86                 dprintk("%s could not handle NFSv4 error %d\n",
  87                                 __func__, -err);
  88                 break;
  89         }
  90         return -EIO;
  91 }
  92
  93 /*
  94  * This is our standard bitmap for GETATTR requests.
  95  */
  96 const u32 nfs4_fattr_bitmap[2] = {
  97         FATTR4_WORD0_TYPE
  98         | FATTR4_WORD0_CHANGE
  99         | FATTR4_WORD0_SIZE
 100         | FATTR4_WORD0_FSID
 101         | FATTR4_WORD0_FILEID,
 102         FATTR4_WORD1_MODE
 103         | FATTR4_WORD1_NUMLINKS
 104         | FATTR4_WORD1_OWNER
 105         | FATTR4_WORD1_OWNER_GROUP
 106         | FATTR4_WORD1_RAWDEV
 107         | FATTR4_WORD1_SPACE_USED
 108         | FATTR4_WORD1_TIME_ACCESS
 109         | FATTR4_WORD1_TIME_METADATA
 110         | FATTR4_WORD1_TIME_MODIFY
 111 };
 112
 113 const u32 nfs4_statfs_bitmap[2] = {
 114         FATTR4_WORD0_FILES_AVAIL
 115         | FATTR4_WORD0_FILES_FREE
 116         | FATTR4_WORD0_FILES_TOTAL,
 117         FATTR4_WORD1_SPACE_AVAIL
 118         | FATTR4_WORD1_SPACE_FREE
 119         | FATTR4_WORD1_SPACE_TOTAL
 120 };
 121
 122 const u32 nfs4_pathconf_bitmap[2] = {
 123         FATTR4_WORD0_MAXLINK
 124         | FATTR4_WORD0_MAXNAME,
 125         0
 126 };
 127
 128 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 129                         | FATTR4_WORD0_MAXREAD
 130                         | FATTR4_WORD0_MAXWRITE
 131                         | FATTR4_WORD0_LEASE_TIME,
 132                         0
 133 };
 134
 135 const u32 nfs4_fs_locations_bitmap[2] = {
 136         FATTR4_WORD0_TYPE
 137         | FATTR4_WORD0_CHANGE
 138         | FATTR4_WORD0_SIZE
 139         | FATTR4_WORD0_FSID
 140         | FATTR4_WORD0_FILEID
 141         | FATTR4_WORD0_FS_LOCATIONS,
 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_WORD1_MOUNTED_ON_FILEID
 152 };
 153
 154 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 155                 struct nfs4_readdir_arg *readdir)
 156 {
 157         __be32 *start, *p;
 158
 159         BUG_ON(readdir->count < 80);
 160         if (cookie > 2) {
 161                 readdir->cookie = cookie;
 162                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 163                 return;
 164         }
 165
 166         readdir->cookie = 0;
 167         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 168         if (cookie == 2)
 169                 return;
 170
 171         /*
 172          * NFSv4 servers do not return entries for '.' and '..'
 173          * Therefore, we fake these entries here.  We let '.'
 174          * have cookie 0 and '..' have cookie 1.  Note that
 175          * when talking to the server, we always send cookie 0
 176          * instead of 1 or 2.
 177          */
 178         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 179
 180         if (cookie == 0) {
 181                 *p++ = xdr_one;                                  /* next */
 182                 *p++ = xdr_zero;                   /* cookie, first word */
 183                 *p++ = xdr_one;                   /* cookie, second word */
 184                 *p++ = xdr_one;                             /* entry len */
 185                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 186                 p++;
 187                 *p++ = xdr_one;                         /* bitmap length */
 188                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189                 *p++ = htonl(8);              /* attribute buffer length */
 190                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 191         }
 192
 193         *p++ = xdr_one;                                  /* next */
 194         *p++ = xdr_zero;                   /* cookie, first word */
 195         *p++ = xdr_two;                   /* cookie, second word */
 196         *p++ = xdr_two;                             /* entry len */
 197         memcpy(p, "..\0\0", 4);                         /* entry */
 198         p++;
 199         *p++ = xdr_one;                         /* bitmap length */
 200         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201         *p++ = htonl(8);              /* attribute buffer length */
 202         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 203
 204         readdir->pgbase = (char *)p - (char *)start;
 205         readdir->count -= readdir->pgbase;
 206         kunmap_atomic(start, KM_USER0);
 207 }
 208
 209 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 210 {
 211         int res;
 212
 213         might_sleep();
 214
 215         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 216                         nfs_wait_bit_killable, TASK_KILLABLE);
 217         return res;
 218 }
 219
 220 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 221 {
 222         int res = 0;
 223
 224         might_sleep();
 225
 226         if (*timeout <= 0)
 227                 *timeout = NFS4_POLL_RETRY_MIN;
 228         if (*timeout > NFS4_POLL_RETRY_MAX)
 229                 *timeout = NFS4_POLL_RETRY_MAX;
 230         schedule_timeout_killable(*timeout);
 231         if (fatal_signal_pending(current))
 232                 res = -ERESTARTSYS;
 233         *timeout <<= 1;
 234         return res;
 235 }
 236
 237 /* This is the error handling routine for processes that are allowed
 238  * to sleep.
 239  */
 240 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 241 {
 242         struct nfs_client *clp = server->nfs_client;
 243         struct nfs4_state *state = exception->state;
 244         int ret = errorcode;
 245
 246         exception->retry = 0;
 247         switch(errorcode) {
 248                 case 0:
 249                         return 0;
 250                 case -NFS4ERR_ADMIN_REVOKED:
 251                 case -NFS4ERR_BAD_STATEID:
 252                 case -NFS4ERR_OPENMODE:
 253                         if (state == NULL)
 254                                 break;
 255                         nfs4_state_mark_reclaim_nograce(clp, state);
 256                         goto do_state_recovery;
 257                 case -NFS4ERR_STALE_STATEID:
 258                         if (state == NULL)
 259                                 break;
 260                         nfs4_state_mark_reclaim_reboot(clp, state);
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 307 {
 308         spin_lock(&clp->cl_lock);
 309         if (time_before(clp->cl_last_renewal,timestamp))
 310                 clp->cl_last_renewal = timestamp;
 311         spin_unlock(&clp->cl_lock);
 312 }
 313
 314 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 315 {
 316         do_renew_lease(server->nfs_client, timestamp);
 317 }
 318
 319 #if defined(CONFIG_NFS_V4_1)
 320
 321 /*
 322  * nfs4_free_slot - free a slot and efficiently update slot table.
 323  *
 324  * freeing a slot is trivially done by clearing its respective bit
 325  * in the bitmap.
 326  * If the freed slotid equals highest_used_slotid we want to update it
 327  * so that the server would be able to size down the slot table if needed,
 328  * otherwise we know that the highest_used_slotid is still in use.
 329  * When updating highest_used_slotid there may be "holes" in the bitmap
 330  * so we need to scan down from highest_used_slotid to 0 looking for the now
 331  * highest slotid in use.
 332  * If none found, highest_used_slotid is set to -1.
 333  *
 334  * Must be called while holding tbl->slot_tbl_lock
 335  */
 336 static void
 337 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 338 {
 339         int slotid = free_slotid;
 340
 341         /* clear used bit in bitmap */
 342         __clear_bit(slotid, tbl->used_slots);
 343
 344         /* update highest_used_slotid when it is freed */
 345         if (slotid == tbl->highest_used_slotid) {
 346                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 347                 if (slotid < tbl->max_slots)
 348                         tbl->highest_used_slotid = slotid;
 349                 else
 350                         tbl->highest_used_slotid = -1;
 351         }
 352         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 353                 free_slotid, tbl->highest_used_slotid);
 354 }
 355
 356 /*
 357  * Signal state manager thread if session is drained
 358  */
 359 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 360 {
 361         struct rpc_task *task;
 362
 363         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 364                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 365                 if (task)
 366                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 367                 return;
 368         }
 369
 370         if (ses->fc_slot_table.highest_used_slotid != -1)
 371                 return;
 372
 373         dprintk("%s COMPLETE: Session Drained\n", __func__);
 374         complete(&ses->complete);
 375 }
 376
 377 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 378 {
 379         struct nfs4_slot_table *tbl;
 380
 381         tbl = &res->sr_session->fc_slot_table;
 382         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 383                 /* just wake up the next guy waiting since
 384                  * we may have not consumed a slot after all */
 385                 dprintk("%s: No slot\n", __func__);
 386                 return;
 387         }
 388
 389         spin_lock(&tbl->slot_tbl_lock);
 390         nfs4_free_slot(tbl, res->sr_slotid);
 391         nfs41_check_drain_session_complete(res->sr_session);
 392         spin_unlock(&tbl->slot_tbl_lock);
 393         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 394 }
 395
 396 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 397 {
 398         unsigned long timestamp;
 399         struct nfs4_slot_table *tbl;
 400         struct nfs4_slot *slot;
 401         struct nfs_client *clp;
 402
 403         /*
 404          * sr_status remains 1 if an RPC level error occurred. The server
 405          * may or may not have processed the sequence operation..
 406          * Proceed as if the server received and processed the sequence
 407          * operation.
 408          */
 409         if (res->sr_status == 1)
 410                 res->sr_status = NFS_OK;
 411
 412         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 413         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 414                 goto out;
 415
 416         tbl = &res->sr_session->fc_slot_table;
 417         slot = tbl->slots + res->sr_slotid;
 418
 419         /* Check the SEQUENCE operation status */
 420         switch (res->sr_status) {
 421         case 0:
 422                 /* Update the slot's sequence and clientid lease timer */
 423                 ++slot->seq_nr;
 424                 timestamp = res->sr_renewal_time;
 425                 clp = res->sr_session->clp;
 426                 do_renew_lease(clp, timestamp);
 427                 /* Check sequence flags */
 428                 if (atomic_read(&clp->cl_count) > 1)
 429                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 430                 break;
 431         case -NFS4ERR_DELAY:
 432                 /* The server detected a resend of the RPC call and
 433                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 434                  * of RFC5661.
 435                  */
 436                 dprintk("%s: slot=%d seq=%d: Operation in progress\n",
 437                                 __func__, res->sr_slotid, slot->seq_nr);
 438                 goto out_retry;
 439         default:
 440                 /* Just update the slot sequence no. */
 441                 ++slot->seq_nr;
 442         }
 443 out:
 444         /* The session may be reset by one of the error handlers. */
 445         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 446         nfs41_sequence_free_slot(res);
 447         return 1;
 448 out_retry:
 449         if (!rpc_restart_call(task))
 450                 goto out;
 451         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 452         return 0;
 453 }
 454
 455 static int nfs4_sequence_done(struct rpc_task *task,
 456                                struct nfs4_sequence_res *res)
 457 {
 458         if (res->sr_session == NULL)
 459                 return 1;
 460         return nfs41_sequence_done(task, res);
 461 }
 462
 463 /*
 464  * nfs4_find_slot - efficiently look for a free slot
 465  *
 466  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 467  * If found, we mark the slot as used, update the highest_used_slotid,
 468  * and respectively set up the sequence operation args.
 469  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 470  *
 471  * Note: must be called with under the slot_tbl_lock.
 472  */
 473 static u8
 474 nfs4_find_slot(struct nfs4_slot_table *tbl)
 475 {
 476         int slotid;
 477         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 478         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 479
 480         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 481                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 482                 tbl->max_slots);
 483         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 484         if (slotid >= tbl->max_slots)
 485                 goto out;
 486         __set_bit(slotid, tbl->used_slots);
 487         if (slotid > tbl->highest_used_slotid)
 488                 tbl->highest_used_slotid = slotid;
 489         ret_id = slotid;
 490 out:
 491         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 492                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 493         return ret_id;
 494 }
 495
 496 static int nfs41_setup_sequence(struct nfs4_session *session,
 497                                 struct nfs4_sequence_args *args,
 498                                 struct nfs4_sequence_res *res,
 499                                 int cache_reply,
 500                                 struct rpc_task *task)
 501 {
 502         struct nfs4_slot *slot;
 503         struct nfs4_slot_table *tbl;
 504         u8 slotid;
 505
 506         dprintk("--> %s\n", __func__);
 507         /* slot already allocated? */
 508         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 509                 return 0;
 510
 511         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 512         tbl = &session->fc_slot_table;
 513
 514         spin_lock(&tbl->slot_tbl_lock);
 515         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 516             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 517                 /*
 518                  * The state manager will wait until the slot table is empty.
 519                  * Schedule the reset thread
 520                  */
 521                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 522                 spin_unlock(&tbl->slot_tbl_lock);
 523                 dprintk("%s Schedule Session Reset\n", __func__);
 524                 return -EAGAIN;
 525         }
 526
 527         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 528             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 529                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 530                 spin_unlock(&tbl->slot_tbl_lock);
 531                 dprintk("%s enforce FIFO order\n", __func__);
 532                 return -EAGAIN;
 533         }
 534
 535         slotid = nfs4_find_slot(tbl);
 536         if (slotid == NFS4_MAX_SLOT_TABLE) {
 537                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 538                 spin_unlock(&tbl->slot_tbl_lock);
 539                 dprintk("<-- %s: no free slots\n", __func__);
 540                 return -EAGAIN;
 541         }
 542         spin_unlock(&tbl->slot_tbl_lock);
 543
 544         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 545         slot = tbl->slots + slotid;
 546         args->sa_session = session;
 547         args->sa_slotid = slotid;
 548         args->sa_cache_this = cache_reply;
 549
 550         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 551
 552         res->sr_session = session;
 553         res->sr_slotid = slotid;
 554         res->sr_renewal_time = jiffies;
 555         res->sr_status_flags = 0;
 556         /*
 557          * sr_status is only set in decode_sequence, and so will remain
 558          * set to 1 if an rpc level failure occurs.
 559          */
 560         res->sr_status = 1;
 561         return 0;
 562 }
 563
 564 int nfs4_setup_sequence(const struct nfs_server *server,
 565                         struct nfs4_sequence_args *args,
 566                         struct nfs4_sequence_res *res,
 567                         int cache_reply,
 568                         struct rpc_task *task)
 569 {
 570         struct nfs4_session *session = nfs4_get_session(server);
 571         int ret = 0;
 572
 573         if (session == NULL) {
 574                 args->sa_session = NULL;
 575                 res->sr_session = NULL;
 576                 goto out;
 577         }
 578
 579         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 580                 __func__, session->clp, session, res->sr_slotid);
 581
 582         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 583                                    task);
 584 out:
 585         dprintk("<-- %s status=%d\n", __func__, ret);
 586         return ret;
 587 }
 588
 589 struct nfs41_call_sync_data {
 590         const struct nfs_server *seq_server;
 591         struct nfs4_sequence_args *seq_args;
 592         struct nfs4_sequence_res *seq_res;
 593         int cache_reply;
 594 };
 595
 596 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 597 {
 598         struct nfs41_call_sync_data *data = calldata;
 599
 600         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 601
 602         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 603                                 data->seq_res, data->cache_reply, task))
 604                 return;
 605         rpc_call_start(task);
 606 }
 607
 608 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 609 {
 610         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 611         nfs41_call_sync_prepare(task, calldata);
 612 }
 613
 614 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 615 {
 616         struct nfs41_call_sync_data *data = calldata;
 617
 618         nfs41_sequence_done(task, data->seq_res);
 619 }
 620
 621 struct rpc_call_ops nfs41_call_sync_ops = {
 622         .rpc_call_prepare = nfs41_call_sync_prepare,
 623         .rpc_call_done = nfs41_call_sync_done,
 624 };
 625
 626 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 627         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 628         .rpc_call_done = nfs41_call_sync_done,
 629 };
 630
 631 static int nfs4_call_sync_sequence(struct nfs_server *server,
 632                                    struct rpc_message *msg,
 633                                    struct nfs4_sequence_args *args,
 634                                    struct nfs4_sequence_res *res,
 635                                    int cache_reply,
 636                                    int privileged)
 637 {
 638         int ret;
 639         struct rpc_task *task;
 640         struct nfs41_call_sync_data data = {
 641                 .seq_server = server,
 642                 .seq_args = args,
 643                 .seq_res = res,
 644                 .cache_reply = cache_reply,
 645         };
 646         struct rpc_task_setup task_setup = {
 647                 .rpc_client = server->client,
 648                 .rpc_message = msg,
 649                 .callback_ops = &nfs41_call_sync_ops,
 650                 .callback_data = &data
 651         };
 652
 653         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 654         if (privileged)
 655                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 656         task = rpc_run_task(&task_setup);
 657         if (IS_ERR(task))
 658                 ret = PTR_ERR(task);
 659         else {
 660                 ret = task->tk_status;
 661                 rpc_put_task(task);
 662         }
 663         return ret;
 664 }
 665
 666 int _nfs4_call_sync_session(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         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 673 }
 674
 675 #else
 676 static int nfs4_sequence_done(struct rpc_task *task,
 677                                struct nfs4_sequence_res *res)
 678 {
 679         return 1;
 680 }
 681 #endif /* CONFIG_NFS_V4_1 */
 682
 683 int _nfs4_call_sync(struct nfs_server *server,
 684                     struct rpc_message *msg,
 685                     struct nfs4_sequence_args *args,
 686                     struct nfs4_sequence_res *res,
 687                     int cache_reply)
 688 {
 689         args->sa_session = res->sr_session = NULL;
 690         return rpc_call_sync(server->client, msg, 0);
 691 }
 692
 693 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 694         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 695                         &(res)->seq_res, (cache_reply))
 696
 697 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 698 {
 699         struct nfs_inode *nfsi = NFS_I(dir);
 700
 701         spin_lock(&dir->i_lock);
 702         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 703         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 704                 nfs_force_lookup_revalidate(dir);
 705         nfsi->change_attr = cinfo->after;
 706         spin_unlock(&dir->i_lock);
 707 }
 708
 709 struct nfs4_opendata {
 710         struct kref kref;
 711         struct nfs_openargs o_arg;
 712         struct nfs_openres o_res;
 713         struct nfs_open_confirmargs c_arg;
 714         struct nfs_open_confirmres c_res;
 715         struct nfs_fattr f_attr;
 716         struct nfs_fattr dir_attr;
 717         struct path path;
 718         struct dentry *dir;
 719         struct nfs4_state_owner *owner;
 720         struct nfs4_state *state;
 721         struct iattr attrs;
 722         unsigned long timestamp;
 723         unsigned int rpc_done : 1;
 724         int rpc_status;
 725         int cancelled;
 726 };
 727
 728
 729 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 730 {
 731         p->o_res.f_attr = &p->f_attr;
 732         p->o_res.dir_attr = &p->dir_attr;
 733         p->o_res.seqid = p->o_arg.seqid;
 734         p->c_res.seqid = p->c_arg.seqid;
 735         p->o_res.server = p->o_arg.server;
 736         nfs_fattr_init(&p->f_attr);
 737         nfs_fattr_init(&p->dir_attr);
 738         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 739 }
 740
 741 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 742                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 743                 const struct iattr *attrs,
 744                 gfp_t gfp_mask)
 745 {
 746         struct dentry *parent = dget_parent(path->dentry);
 747         struct inode *dir = parent->d_inode;
 748         struct nfs_server *server = NFS_SERVER(dir);
 749         struct nfs4_opendata *p;
 750
 751         p = kzalloc(sizeof(*p), gfp_mask);
 752         if (p == NULL)
 753                 goto err;
 754         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 755         if (p->o_arg.seqid == NULL)
 756                 goto err_free;
 757         path_get(path);
 758         p->path = *path;
 759         p->dir = parent;
 760         p->owner = sp;
 761         atomic_inc(&sp->so_count);
 762         p->o_arg.fh = NFS_FH(dir);
 763         p->o_arg.open_flags = flags;
 764         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 765         p->o_arg.clientid = server->nfs_client->cl_clientid;
 766         p->o_arg.id = sp->so_owner_id.id;
 767         p->o_arg.name = &p->path.dentry->d_name;
 768         p->o_arg.server = server;
 769         p->o_arg.bitmask = server->attr_bitmask;
 770         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 771         if (flags & O_CREAT) {
 772                 u32 *s;
 773
 774                 p->o_arg.u.attrs = &p->attrs;
 775                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 776                 s = (u32 *) p->o_arg.u.verifier.data;
 777                 s[0] = jiffies;
 778                 s[1] = current->pid;
 779         }
 780         p->c_arg.fh = &p->o_res.fh;
 781         p->c_arg.stateid = &p->o_res.stateid;
 782         p->c_arg.seqid = p->o_arg.seqid;
 783         nfs4_init_opendata_res(p);
 784         kref_init(&p->kref);
 785         return p;
 786 err_free:
 787         kfree(p);
 788 err:
 789         dput(parent);
 790         return NULL;
 791 }
 792
 793 static void nfs4_opendata_free(struct kref *kref)
 794 {
 795         struct nfs4_opendata *p = container_of(kref,
 796                         struct nfs4_opendata, kref);
 797
 798         nfs_free_seqid(p->o_arg.seqid);
 799         if (p->state != NULL)
 800                 nfs4_put_open_state(p->state);
 801         nfs4_put_state_owner(p->owner);
 802         dput(p->dir);
 803         path_put(&p->path);
 804         kfree(p);
 805 }
 806
 807 static void nfs4_opendata_put(struct nfs4_opendata *p)
 808 {
 809         if (p != NULL)
 810                 kref_put(&p->kref, nfs4_opendata_free);
 811 }
 812
 813 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 814 {
 815         int ret;
 816
 817         ret = rpc_wait_for_completion_task(task);
 818         return ret;
 819 }
 820
 821 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 822 {
 823         int ret = 0;
 824
 825         if (open_mode & O_EXCL)
 826                 goto out;
 827         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 828                 case FMODE_READ:
 829                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 830                                 && state->n_rdonly != 0;
 831                         break;
 832                 case FMODE_WRITE:
 833                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 834                                 && state->n_wronly != 0;
 835                         break;
 836                 case FMODE_READ|FMODE_WRITE:
 837                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 838                                 && state->n_rdwr != 0;
 839         }
 840 out:
 841         return ret;
 842 }
 843
 844 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 845 {
 846         if ((delegation->type & fmode) != fmode)
 847                 return 0;
 848         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 849                 return 0;
 850         nfs_mark_delegation_referenced(delegation);
 851         return 1;
 852 }
 853
 854 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 855 {
 856         switch (fmode) {
 857                 case FMODE_WRITE:
 858                         state->n_wronly++;
 859                         break;
 860                 case FMODE_READ:
 861                         state->n_rdonly++;
 862                         break;
 863                 case FMODE_READ|FMODE_WRITE:
 864                         state->n_rdwr++;
 865         }
 866         nfs4_state_set_mode_locked(state, state->state | fmode);
 867 }
 868
 869 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 870 {
 871         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 872                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 873         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 874         switch (fmode) {
 875                 case FMODE_READ:
 876                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 877                         break;
 878                 case FMODE_WRITE:
 879                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 880                         break;
 881                 case FMODE_READ|FMODE_WRITE:
 882                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 883         }
 884 }
 885
 886 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 887 {
 888         write_seqlock(&state->seqlock);
 889         nfs_set_open_stateid_locked(state, stateid, fmode);
 890         write_sequnlock(&state->seqlock);
 891 }
 892
 893 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 894 {
 895         /*
 896          * Protect the call to nfs4_state_set_mode_locked and
 897          * serialise the stateid update
 898          */
 899         write_seqlock(&state->seqlock);
 900         if (deleg_stateid != NULL) {
 901                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 902                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 903         }
 904         if (open_stateid != NULL)
 905                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 906         write_sequnlock(&state->seqlock);
 907         spin_lock(&state->owner->so_lock);
 908         update_open_stateflags(state, fmode);
 909         spin_unlock(&state->owner->so_lock);
 910 }
 911
 912 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 913 {
 914         struct nfs_inode *nfsi = NFS_I(state->inode);
 915         struct nfs_delegation *deleg_cur;
 916         int ret = 0;
 917
 918         fmode &= (FMODE_READ|FMODE_WRITE);
 919
 920         rcu_read_lock();
 921         deleg_cur = rcu_dereference(nfsi->delegation);
 922         if (deleg_cur == NULL)
 923                 goto no_delegation;
 924
 925         spin_lock(&deleg_cur->lock);
 926         if (nfsi->delegation != deleg_cur ||
 927             (deleg_cur->type & fmode) != fmode)
 928                 goto no_delegation_unlock;
 929
 930         if (delegation == NULL)
 931                 delegation = &deleg_cur->stateid;
 932         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 933                 goto no_delegation_unlock;
 934
 935         nfs_mark_delegation_referenced(deleg_cur);
 936         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 937         ret = 1;
 938 no_delegation_unlock:
 939         spin_unlock(&deleg_cur->lock);
 940 no_delegation:
 941         rcu_read_unlock();
 942
 943         if (!ret && open_stateid != NULL) {
 944                 __update_open_stateid(state, open_stateid, NULL, fmode);
 945                 ret = 1;
 946         }
 947
 948         return ret;
 949 }
 950
 951
 952 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 953 {
 954         struct nfs_delegation *delegation;
 955
 956         rcu_read_lock();
 957         delegation = rcu_dereference(NFS_I(inode)->delegation);
 958         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 959                 rcu_read_unlock();
 960                 return;
 961         }
 962         rcu_read_unlock();
 963         nfs_inode_return_delegation(inode);
 964 }
 965
 966 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 967 {
 968         struct nfs4_state *state = opendata->state;
 969         struct nfs_inode *nfsi = NFS_I(state->inode);
 970         struct nfs_delegation *delegation;
 971         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 972         fmode_t fmode = opendata->o_arg.fmode;
 973         nfs4_stateid stateid;
 974         int ret = -EAGAIN;
 975
 976         for (;;) {
 977                 if (can_open_cached(state, fmode, open_mode)) {
 978                         spin_lock(&state->owner->so_lock);
 979                         if (can_open_cached(state, fmode, open_mode)) {
 980                                 update_open_stateflags(state, fmode);
 981                                 spin_unlock(&state->owner->so_lock);
 982                                 goto out_return_state;
 983                         }
 984                         spin_unlock(&state->owner->so_lock);
 985                 }
 986                 rcu_read_lock();
 987                 delegation = rcu_dereference(nfsi->delegation);
 988                 if (delegation == NULL ||
 989                     !can_open_delegated(delegation, fmode)) {
 990                         rcu_read_unlock();
 991                         break;
 992                 }
 993                 /* Save the delegation */
 994                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 995                 rcu_read_unlock();
 996                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 997                 if (ret != 0)
 998                         goto out;
 999                 ret = -EAGAIN;
1000
1001                 /* Try to update the stateid using the delegation */
1002                 if (update_open_stateid(state, NULL, &stateid, fmode))
1003                         goto out_return_state;
1004         }
1005 out:
1006         return ERR_PTR(ret);
1007 out_return_state:
1008         atomic_inc(&state->count);
1009         return state;
1010 }
1011
1012 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1013 {
1014         struct inode *inode;
1015         struct nfs4_state *state = NULL;
1016         struct nfs_delegation *delegation;
1017         int ret;
1018
1019         if (!data->rpc_done) {
1020                 state = nfs4_try_open_cached(data);
1021                 goto out;
1022         }
1023
1024         ret = -EAGAIN;
1025         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1026                 goto err;
1027         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1028         ret = PTR_ERR(inode);
1029         if (IS_ERR(inode))
1030                 goto err;
1031         ret = -ENOMEM;
1032         state = nfs4_get_open_state(inode, data->owner);
1033         if (state == NULL)
1034                 goto err_put_inode;
1035         if (data->o_res.delegation_type != 0) {
1036                 int delegation_flags = 0;
1037
1038                 rcu_read_lock();
1039                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1040                 if (delegation)
1041                         delegation_flags = delegation->flags;
1042                 rcu_read_unlock();
1043                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1044                         nfs_inode_set_delegation(state->inode,
1045                                         data->owner->so_cred,
1046                                         &data->o_res);
1047                 else
1048                         nfs_inode_reclaim_delegation(state->inode,
1049                                         data->owner->so_cred,
1050                                         &data->o_res);
1051         }
1052
1053         update_open_stateid(state, &data->o_res.stateid, NULL,
1054                         data->o_arg.fmode);
1055         iput(inode);
1056 out:
1057         return state;
1058 err_put_inode:
1059         iput(inode);
1060 err:
1061         return ERR_PTR(ret);
1062 }
1063
1064 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1065 {
1066         struct nfs_inode *nfsi = NFS_I(state->inode);
1067         struct nfs_open_context *ctx;
1068
1069         spin_lock(&state->inode->i_lock);
1070         list_for_each_entry(ctx, &nfsi->open_files, list) {
1071                 if (ctx->state != state)
1072                         continue;
1073                 get_nfs_open_context(ctx);
1074                 spin_unlock(&state->inode->i_lock);
1075                 return ctx;
1076         }
1077         spin_unlock(&state->inode->i_lock);
1078         return ERR_PTR(-ENOENT);
1079 }
1080
1081 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1082 {
1083         struct nfs4_opendata *opendata;
1084
1085         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1086         if (opendata == NULL)
1087                 return ERR_PTR(-ENOMEM);
1088         opendata->state = state;
1089         atomic_inc(&state->count);
1090         return opendata;
1091 }
1092
1093 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1094 {
1095         struct nfs4_state *newstate;
1096         int ret;
1097
1098         opendata->o_arg.open_flags = 0;
1099         opendata->o_arg.fmode = fmode;
1100         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1101         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1102         nfs4_init_opendata_res(opendata);
1103         ret = _nfs4_recover_proc_open(opendata);
1104         if (ret != 0)
1105                 return ret;
1106         newstate = nfs4_opendata_to_nfs4_state(opendata);
1107         if (IS_ERR(newstate))
1108                 return PTR_ERR(newstate);
1109         nfs4_close_state(&opendata->path, newstate, fmode);
1110         *res = newstate;
1111         return 0;
1112 }
1113
1114 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1115 {
1116         struct nfs4_state *newstate;
1117         int ret;
1118
1119         /* memory barrier prior to reading state->n_* */
1120         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1121         smp_rmb();
1122         if (state->n_rdwr != 0) {
1123                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1124                 if (ret != 0)
1125                         return ret;
1126                 if (newstate != state)
1127                         return -ESTALE;
1128         }
1129         if (state->n_wronly != 0) {
1130                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1131                 if (ret != 0)
1132                         return ret;
1133                 if (newstate != state)
1134                         return -ESTALE;
1135         }
1136         if (state->n_rdonly != 0) {
1137                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1138                 if (ret != 0)
1139                         return ret;
1140                 if (newstate != state)
1141                         return -ESTALE;
1142         }
1143         /*
1144          * We may have performed cached opens for all three recoveries.
1145          * Check if we need to update the current stateid.
1146          */
1147         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1148             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1149                 write_seqlock(&state->seqlock);
1150                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1151                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1152                 write_sequnlock(&state->seqlock);
1153         }
1154         return 0;
1155 }
1156
1157 /*
1158  * OPEN_RECLAIM:
1159  *      reclaim state on the server after a reboot.
1160  */
1161 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1162 {
1163         struct nfs_delegation *delegation;
1164         struct nfs4_opendata *opendata;
1165         fmode_t delegation_type = 0;
1166         int status;
1167
1168         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1169         if (IS_ERR(opendata))
1170                 return PTR_ERR(opendata);
1171         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1172         opendata->o_arg.fh = NFS_FH(state->inode);
1173         rcu_read_lock();
1174         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1175         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1176                 delegation_type = delegation->type;
1177         rcu_read_unlock();
1178         opendata->o_arg.u.delegation_type = delegation_type;
1179         status = nfs4_open_recover(opendata, state);
1180         nfs4_opendata_put(opendata);
1181         return status;
1182 }
1183
1184 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1185 {
1186         struct nfs_server *server = NFS_SERVER(state->inode);
1187         struct nfs4_exception exception = { };
1188         int err;
1189         do {
1190                 err = _nfs4_do_open_reclaim(ctx, state);
1191                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1192                         break;
1193                 nfs4_handle_exception(server, err, &exception);
1194         } while (exception.retry);
1195         return err;
1196 }
1197
1198 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1199 {
1200         struct nfs_open_context *ctx;
1201         int ret;
1202
1203         ctx = nfs4_state_find_open_context(state);
1204         if (IS_ERR(ctx))
1205                 return PTR_ERR(ctx);
1206         ret = nfs4_do_open_reclaim(ctx, state);
1207         put_nfs_open_context(ctx);
1208         return ret;
1209 }
1210
1211 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1212 {
1213         struct nfs4_opendata *opendata;
1214         int ret;
1215
1216         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1217         if (IS_ERR(opendata))
1218                 return PTR_ERR(opendata);
1219         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1220         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1221                         sizeof(opendata->o_arg.u.delegation.data));
1222         ret = nfs4_open_recover(opendata, state);
1223         nfs4_opendata_put(opendata);
1224         return ret;
1225 }
1226
1227 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1228 {
1229         struct nfs4_exception exception = { };
1230         struct nfs_server *server = NFS_SERVER(state->inode);
1231         int err;
1232         do {
1233                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1234                 switch (err) {
1235                         case 0:
1236                         case -ENOENT:
1237                         case -ESTALE:
1238                                 goto out;
1239                         case -NFS4ERR_BADSESSION:
1240                         case -NFS4ERR_BADSLOT:
1241                         case -NFS4ERR_BAD_HIGH_SLOT:
1242                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1243                         case -NFS4ERR_DEADSESSION:
1244                                 nfs4_schedule_state_recovery(
1245                                         server->nfs_client);
1246                                 goto out;
1247                         case -NFS4ERR_STALE_CLIENTID:
1248                         case -NFS4ERR_STALE_STATEID:
1249                         case -NFS4ERR_EXPIRED:
1250                                 /* Don't recall a delegation if it was lost */
1251                                 nfs4_schedule_state_recovery(server->nfs_client);
1252                                 goto out;
1253                         case -ERESTARTSYS:
1254                                 /*
1255                                  * The show must go on: exit, but mark the
1256                                  * stateid as needing recovery.
1257                                  */
1258                         case -NFS4ERR_ADMIN_REVOKED:
1259                         case -NFS4ERR_BAD_STATEID:
1260                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1261                         case -ENOMEM:
1262                                 err = 0;
1263                                 goto out;
1264                 }
1265                 err = nfs4_handle_exception(server, err, &exception);
1266         } while (exception.retry);
1267 out:
1268         return err;
1269 }
1270
1271 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1272 {
1273         struct nfs4_opendata *data = calldata;
1274
1275         data->rpc_status = task->tk_status;
1276         if (data->rpc_status == 0) {
1277                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1278                                 sizeof(data->o_res.stateid.data));
1279                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1280                 renew_lease(data->o_res.server, data->timestamp);
1281                 data->rpc_done = 1;
1282         }
1283 }
1284
1285 static void nfs4_open_confirm_release(void *calldata)
1286 {
1287         struct nfs4_opendata *data = calldata;
1288         struct nfs4_state *state = NULL;
1289
1290         /* If this request hasn't been cancelled, do nothing */
1291         if (data->cancelled == 0)
1292                 goto out_free;
1293         /* In case of error, no cleanup! */
1294         if (!data->rpc_done)
1295                 goto out_free;
1296         state = nfs4_opendata_to_nfs4_state(data);
1297         if (!IS_ERR(state))
1298                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1299 out_free:
1300         nfs4_opendata_put(data);
1301 }
1302
1303 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1304         .rpc_call_done = nfs4_open_confirm_done,
1305         .rpc_release = nfs4_open_confirm_release,
1306 };
1307
1308 /*
1309  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1310  */
1311 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1312 {
1313         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1314         struct rpc_task *task;
1315         struct  rpc_message msg = {
1316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1317                 .rpc_argp = &data->c_arg,
1318                 .rpc_resp = &data->c_res,
1319                 .rpc_cred = data->owner->so_cred,
1320         };
1321         struct rpc_task_setup task_setup_data = {
1322                 .rpc_client = server->client,
1323                 .rpc_message = &msg,
1324                 .callback_ops = &nfs4_open_confirm_ops,
1325                 .callback_data = data,
1326                 .workqueue = nfsiod_workqueue,
1327                 .flags = RPC_TASK_ASYNC,
1328         };
1329         int status;
1330
1331         kref_get(&data->kref);
1332         data->rpc_done = 0;
1333         data->rpc_status = 0;
1334         data->timestamp = jiffies;
1335         task = rpc_run_task(&task_setup_data);
1336         if (IS_ERR(task))
1337                 return PTR_ERR(task);
1338         status = nfs4_wait_for_completion_rpc_task(task);
1339         if (status != 0) {
1340                 data->cancelled = 1;
1341                 smp_wmb();
1342         } else
1343                 status = data->rpc_status;
1344         rpc_put_task(task);
1345         return status;
1346 }
1347
1348 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1349 {
1350         struct nfs4_opendata *data = calldata;
1351         struct nfs4_state_owner *sp = data->owner;
1352
1353         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1354                 return;
1355         /*
1356          * Check if we still need to send an OPEN call, or if we can use
1357          * a delegation instead.
1358          */
1359         if (data->state != NULL) {
1360                 struct nfs_delegation *delegation;
1361
1362                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1363                         goto out_no_action;
1364                 rcu_read_lock();
1365                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1366                 if (delegation != NULL &&
1367                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1368                         rcu_read_unlock();
1369                         goto out_no_action;
1370                 }
1371                 rcu_read_unlock();
1372         }
1373         /* Update sequence id. */
1374         data->o_arg.id = sp->so_owner_id.id;
1375         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1376         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1377                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1378                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1379         }
1380         data->timestamp = jiffies;
1381         if (nfs4_setup_sequence(data->o_arg.server,
1382                                 &data->o_arg.seq_args,
1383                                 &data->o_res.seq_res, 1, task))
1384                 return;
1385         rpc_call_start(task);
1386         return;
1387 out_no_action:
1388         task->tk_action = NULL;
1389
1390 }
1391
1392 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1393 {
1394         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1395         nfs4_open_prepare(task, calldata);
1396 }
1397
1398 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1399 {
1400         struct nfs4_opendata *data = calldata;
1401
1402         data->rpc_status = task->tk_status;
1403
1404         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1405                 return;
1406
1407         if (task->tk_status == 0) {
1408                 switch (data->o_res.f_attr->mode & S_IFMT) {
1409                         case S_IFREG:
1410                                 break;
1411                         case S_IFLNK:
1412                                 data->rpc_status = -ELOOP;
1413                                 break;
1414                         case S_IFDIR:
1415                                 data->rpc_status = -EISDIR;
1416                                 break;
1417                         default:
1418                                 data->rpc_status = -ENOTDIR;
1419                 }
1420                 renew_lease(data->o_res.server, data->timestamp);
1421                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1422                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1423         }
1424         data->rpc_done = 1;
1425 }
1426
1427 static void nfs4_open_release(void *calldata)
1428 {
1429         struct nfs4_opendata *data = calldata;
1430         struct nfs4_state *state = NULL;
1431
1432         /* If this request hasn't been cancelled, do nothing */
1433         if (data->cancelled == 0)
1434                 goto out_free;
1435         /* In case of error, no cleanup! */
1436         if (data->rpc_status != 0 || !data->rpc_done)
1437                 goto out_free;
1438         /* In case we need an open_confirm, no cleanup! */
1439         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1440                 goto out_free;
1441         state = nfs4_opendata_to_nfs4_state(data);
1442         if (!IS_ERR(state))
1443                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1444 out_free:
1445         nfs4_opendata_put(data);
1446 }
1447
1448 static const struct rpc_call_ops nfs4_open_ops = {
1449         .rpc_call_prepare = nfs4_open_prepare,
1450         .rpc_call_done = nfs4_open_done,
1451         .rpc_release = nfs4_open_release,
1452 };
1453
1454 static const struct rpc_call_ops nfs4_recover_open_ops = {
1455         .rpc_call_prepare = nfs4_recover_open_prepare,
1456         .rpc_call_done = nfs4_open_done,
1457         .rpc_release = nfs4_open_release,
1458 };
1459
1460 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1461 {
1462         struct inode *dir = data->dir->d_inode;
1463         struct nfs_server *server = NFS_SERVER(dir);
1464         struct nfs_openargs *o_arg = &data->o_arg;
1465         struct nfs_openres *o_res = &data->o_res;
1466         struct rpc_task *task;
1467         struct rpc_message msg = {
1468                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1469                 .rpc_argp = o_arg,
1470                 .rpc_resp = o_res,
1471                 .rpc_cred = data->owner->so_cred,
1472         };
1473         struct rpc_task_setup task_setup_data = {
1474                 .rpc_client = server->client,
1475                 .rpc_message = &msg,
1476                 .callback_ops = &nfs4_open_ops,
1477                 .callback_data = data,
1478                 .workqueue = nfsiod_workqueue,
1479                 .flags = RPC_TASK_ASYNC,
1480         };
1481         int status;
1482
1483         kref_get(&data->kref);
1484         data->rpc_done = 0;
1485         data->rpc_status = 0;
1486         data->cancelled = 0;
1487         if (isrecover)
1488                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1489         task = rpc_run_task(&task_setup_data);
1490         if (IS_ERR(task))
1491                 return PTR_ERR(task);
1492         status = nfs4_wait_for_completion_rpc_task(task);
1493         if (status != 0) {
1494                 data->cancelled = 1;
1495                 smp_wmb();
1496         } else
1497                 status = data->rpc_status;
1498         rpc_put_task(task);
1499
1500         return status;
1501 }
1502
1503 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1504 {
1505         struct inode *dir = data->dir->d_inode;
1506         struct nfs_openres *o_res = &data->o_res;
1507         int status;
1508
1509         status = nfs4_run_open_task(data, 1);
1510         if (status != 0 || !data->rpc_done)
1511                 return status;
1512
1513         nfs_refresh_inode(dir, o_res->dir_attr);
1514
1515         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1516                 status = _nfs4_proc_open_confirm(data);
1517                 if (status != 0)
1518                         return status;
1519         }
1520
1521         return status;
1522 }
1523
1524 /*
1525  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1526  */
1527 static int _nfs4_proc_open(struct nfs4_opendata *data)
1528 {
1529         struct inode *dir = data->dir->d_inode;
1530         struct nfs_server *server = NFS_SERVER(dir);
1531         struct nfs_openargs *o_arg = &data->o_arg;
1532         struct nfs_openres *o_res = &data->o_res;
1533         int status;
1534
1535         status = nfs4_run_open_task(data, 0);
1536         if (status != 0 || !data->rpc_done)
1537                 return status;
1538
1539         if (o_arg->open_flags & O_CREAT) {
1540                 update_changeattr(dir, &o_res->cinfo);
1541                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1542         } else
1543                 nfs_refresh_inode(dir, o_res->dir_attr);
1544         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1545                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1546         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1547                 status = _nfs4_proc_open_confirm(data);
1548                 if (status != 0)
1549                         return status;
1550         }
1551         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1552                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1553         return 0;
1554 }
1555
1556 static int nfs4_recover_expired_lease(struct nfs_server *server)
1557 {
1558         struct nfs_client *clp = server->nfs_client;
1559         unsigned int loop;
1560         int ret;
1561
1562         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1563                 ret = nfs4_wait_clnt_recover(clp);
1564                 if (ret != 0)
1565                         break;
1566                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1567                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1568                         break;
1569                 nfs4_schedule_state_recovery(clp);
1570                 ret = -EIO;
1571         }
1572         return ret;
1573 }
1574
1575 /*
1576  * OPEN_EXPIRED:
1577  *      reclaim state on the server after a network partition.
1578  *      Assumes caller holds the appropriate lock
1579  */
1580 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1581 {
1582         struct nfs4_opendata *opendata;
1583         int ret;
1584
1585         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1586         if (IS_ERR(opendata))
1587                 return PTR_ERR(opendata);
1588         ret = nfs4_open_recover(opendata, state);
1589         if (ret == -ESTALE)
1590                 d_drop(ctx->path.dentry);
1591         nfs4_opendata_put(opendata);
1592         return ret;
1593 }
1594
1595 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1596 {
1597         struct nfs_server *server = NFS_SERVER(state->inode);
1598         struct nfs4_exception exception = { };
1599         int err;
1600
1601         do {
1602                 err = _nfs4_open_expired(ctx, state);
1603                 switch (err) {
1604                 default:
1605                         goto out;
1606                 case -NFS4ERR_GRACE:
1607                 case -NFS4ERR_DELAY:
1608                 case -EKEYEXPIRED:
1609                         nfs4_handle_exception(server, err, &exception);
1610                         err = 0;
1611                 }
1612         } while (exception.retry);
1613 out:
1614         return err;
1615 }
1616
1617 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1618 {
1619         struct nfs_open_context *ctx;
1620         int ret;
1621
1622         ctx = nfs4_state_find_open_context(state);
1623         if (IS_ERR(ctx))
1624                 return PTR_ERR(ctx);
1625         ret = nfs4_do_open_expired(ctx, state);
1626         put_nfs_open_context(ctx);
1627         return ret;
1628 }
1629
1630 /*
1631  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1632  * fields corresponding to attributes that were used to store the verifier.
1633  * Make sure we clobber those fields in the later setattr call
1634  */
1635 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1636 {
1637         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1638             !(sattr->ia_valid & ATTR_ATIME_SET))
1639                 sattr->ia_valid |= ATTR_ATIME;
1640
1641         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1642             !(sattr->ia_valid & ATTR_MTIME_SET))
1643                 sattr->ia_valid |= ATTR_MTIME;
1644 }
1645
1646 /*
1647  * Returns a referenced nfs4_state
1648  */
1649 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1650 {
1651         struct nfs4_state_owner  *sp;
1652         struct nfs4_state     *state = NULL;
1653         struct nfs_server       *server = NFS_SERVER(dir);
1654         struct nfs4_opendata *opendata;
1655         int status;
1656
1657         /* Protect against reboot recovery conflicts */
1658         status = -ENOMEM;
1659         if (!(sp = nfs4_get_state_owner(server, cred))) {
1660                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1661                 goto out_err;
1662         }
1663         status = nfs4_recover_expired_lease(server);
1664         if (status != 0)
1665                 goto err_put_state_owner;
1666         if (path->dentry->d_inode != NULL)
1667                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1668         status = -ENOMEM;
1669         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1670         if (opendata == NULL)
1671                 goto err_put_state_owner;
1672
1673         if (path->dentry->d_inode != NULL)
1674                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1675
1676         status = _nfs4_proc_open(opendata);
1677         if (status != 0)
1678                 goto err_opendata_put;
1679
1680         state = nfs4_opendata_to_nfs4_state(opendata);
1681         status = PTR_ERR(state);
1682         if (IS_ERR(state))
1683                 goto err_opendata_put;
1684         if (server->caps & NFS_CAP_POSIX_LOCK)
1685                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1686
1687         if (opendata->o_arg.open_flags & O_EXCL) {
1688                 nfs4_exclusive_attrset(opendata, sattr);
1689
1690                 nfs_fattr_init(opendata->o_res.f_attr);
1691                 status = nfs4_do_setattr(state->inode, cred,
1692                                 opendata->o_res.f_attr, sattr,
1693                                 state);
1694                 if (status == 0)
1695                         nfs_setattr_update_inode(state->inode, sattr);
1696                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1697         }
1698         nfs4_opendata_put(opendata);
1699         nfs4_put_state_owner(sp);
1700         *res = state;
1701         return 0;
1702 err_opendata_put:
1703         nfs4_opendata_put(opendata);
1704 err_put_state_owner:
1705         nfs4_put_state_owner(sp);
1706 out_err:
1707         *res = NULL;
1708         return status;
1709 }
1710
1711
1712 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1713 {
1714         struct nfs4_exception exception = { };
1715         struct nfs4_state *res;
1716         int status;
1717
1718         do {
1719                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1720                 if (status == 0)
1721                         break;
1722                 /* NOTE: BAD_SEQID means the server and client disagree about the
1723                  * book-keeping w.r.t. state-changing operations
1724                  * (OPEN/CLOSE/LOCK/LOCKU...)
1725                  * It is actually a sign of a bug on the client or on the server.
1726                  *
1727                  * If we receive a BAD_SEQID error in the particular case of
1728                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1729                  * have unhashed the old state_owner for us, and that we can
1730                  * therefore safely retry using a new one. We should still warn
1731                  * the user though...
1732                  */
1733                 if (status == -NFS4ERR_BAD_SEQID) {
1734                         printk(KERN_WARNING "NFS: v4 server %s "
1735                                         " returned a bad sequence-id error!\n",
1736                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1737                         exception.retry = 1;
1738                         continue;
1739                 }
1740                 /*
1741                  * BAD_STATEID on OPEN means that the server cancelled our
1742                  * state before it received the OPEN_CONFIRM.
1743                  * Recover by retrying the request as per the discussion
1744                  * on Page 181 of RFC3530.
1745                  */
1746                 if (status == -NFS4ERR_BAD_STATEID) {
1747                         exception.retry = 1;
1748                         continue;
1749                 }
1750                 if (status == -EAGAIN) {
1751                         /* We must have found a delegation */
1752                         exception.retry = 1;
1753                         continue;
1754                 }
1755                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1756                                         status, &exception));
1757         } while (exception.retry);
1758         return res;
1759 }
1760
1761 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1762                             struct nfs_fattr *fattr, struct iattr *sattr,
1763                             struct nfs4_state *state)
1764 {
1765         struct nfs_server *server = NFS_SERVER(inode);
1766         struct nfs_setattrargs  arg = {
1767                 .fh             = NFS_FH(inode),
1768                 .iap            = sattr,
1769                 .server         = server,
1770                 .bitmask = server->attr_bitmask,
1771         };
1772         struct nfs_setattrres  res = {
1773                 .fattr          = fattr,
1774                 .server         = server,
1775         };
1776         struct rpc_message msg = {
1777                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1778                 .rpc_argp       = &arg,
1779                 .rpc_resp       = &res,
1780                 .rpc_cred       = cred,
1781         };
1782         unsigned long timestamp = jiffies;
1783         int status;
1784
1785         nfs_fattr_init(fattr);
1786
1787         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1788                 /* Use that stateid */
1789         } else if (state != NULL) {
1790                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1791         } else
1792                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1793
1794         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1795         if (status == 0 && state != NULL)
1796                 renew_lease(server, timestamp);
1797         return status;
1798 }
1799
1800 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1801                            struct nfs_fattr *fattr, struct iattr *sattr,
1802                            struct nfs4_state *state)
1803 {
1804         struct nfs_server *server = NFS_SERVER(inode);
1805         struct nfs4_exception exception = { };
1806         int err;
1807         do {
1808                 err = nfs4_handle_exception(server,
1809                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1810                                 &exception);
1811         } while (exception.retry);
1812         return err;
1813 }
1814
1815 struct nfs4_closedata {
1816         struct path path;
1817         struct inode *inode;
1818         struct nfs4_state *state;
1819         struct nfs_closeargs arg;
1820         struct nfs_closeres res;
1821         struct nfs_fattr fattr;
1822         unsigned long timestamp;
1823 };
1824
1825 static void nfs4_free_closedata(void *data)
1826 {
1827         struct nfs4_closedata *calldata = data;
1828         struct nfs4_state_owner *sp = calldata->state->owner;
1829
1830         nfs4_put_open_state(calldata->state);
1831         nfs_free_seqid(calldata->arg.seqid);
1832         nfs4_put_state_owner(sp);
1833         path_put(&calldata->path);
1834         kfree(calldata);
1835 }
1836
1837 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1838                 fmode_t fmode)
1839 {
1840         spin_lock(&state->owner->so_lock);
1841         if (!(fmode & FMODE_READ))
1842                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1843         if (!(fmode & FMODE_WRITE))
1844                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1845         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1846         spin_unlock(&state->owner->so_lock);
1847 }
1848
1849 static void nfs4_close_done(struct rpc_task *task, void *data)
1850 {
1851         struct nfs4_closedata *calldata = data;
1852         struct nfs4_state *state = calldata->state;
1853         struct nfs_server *server = NFS_SERVER(calldata->inode);
1854
1855         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1856                 return;
1857         /* hmm. we are done with the inode, and in the process of freeing
1858          * the state_owner. we keep this around to process errors
1859          */
1860         switch (task->tk_status) {
1861                 case 0:
1862                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1863                         renew_lease(server, calldata->timestamp);
1864                         nfs4_close_clear_stateid_flags(state,
1865                                         calldata->arg.fmode);
1866                         break;
1867                 case -NFS4ERR_STALE_STATEID:
1868                 case -NFS4ERR_OLD_STATEID:
1869                 case -NFS4ERR_BAD_STATEID:
1870                 case -NFS4ERR_EXPIRED:
1871                         if (calldata->arg.fmode == 0)
1872                                 break;
1873                 default:
1874                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1875                                 rpc_restart_call_prepare(task);
1876         }
1877         nfs_release_seqid(calldata->arg.seqid);
1878         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1879 }
1880
1881 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1882 {
1883         struct nfs4_closedata *calldata = data;
1884         struct nfs4_state *state = calldata->state;
1885         int call_close = 0;
1886
1887         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1888                 return;
1889
1890         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1891         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1892         spin_lock(&state->owner->so_lock);
1893         /* Calculate the change in open mode */
1894         if (state->n_rdwr == 0) {
1895                 if (state->n_rdonly == 0) {
1896                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1897                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1898                         calldata->arg.fmode &= ~FMODE_READ;
1899                 }
1900                 if (state->n_wronly == 0) {
1901                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1902                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1903                         calldata->arg.fmode &= ~FMODE_WRITE;
1904                 }
1905         }
1906         spin_unlock(&state->owner->so_lock);
1907
1908         if (!call_close) {
1909                 /* Note: exit _without_ calling nfs4_close_done */
1910                 task->tk_action = NULL;
1911                 return;
1912         }
1913
1914         if (calldata->arg.fmode == 0)
1915                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1916
1917         nfs_fattr_init(calldata->res.fattr);
1918         calldata->timestamp = jiffies;
1919         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1920                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1921                                 1, task))
1922                 return;
1923         rpc_call_start(task);
1924 }
1925
1926 static const struct rpc_call_ops nfs4_close_ops = {
1927         .rpc_call_prepare = nfs4_close_prepare,
1928         .rpc_call_done = nfs4_close_done,
1929         .rpc_release = nfs4_free_closedata,
1930 };
1931
1932 /*
1933  * It is possible for data to be read/written from a mem-mapped file
1934  * after the sys_close call (which hits the vfs layer as a flush).
1935  * This means that we can't safely call nfsv4 close on a file until
1936  * the inode is cleared. This in turn means that we are not good
1937  * NFSv4 citizens - we do not indicate to the server to update the file's
1938  * share state even when we are done with one of the three share
1939  * stateid's in the inode.
1940  *
1941  * NOTE: Caller must be holding the sp->so_owner semaphore!
1942  */
1943 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1944 {
1945         struct nfs_server *server = NFS_SERVER(state->inode);
1946         struct nfs4_closedata *calldata;
1947         struct nfs4_state_owner *sp = state->owner;
1948         struct rpc_task *task;
1949         struct rpc_message msg = {
1950                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1951                 .rpc_cred = state->owner->so_cred,
1952         };
1953         struct rpc_task_setup task_setup_data = {
1954                 .rpc_client = server->client,
1955                 .rpc_message = &msg,
1956                 .callback_ops = &nfs4_close_ops,
1957                 .workqueue = nfsiod_workqueue,
1958                 .flags = RPC_TASK_ASYNC,
1959         };
1960         int status = -ENOMEM;
1961
1962         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1963         if (calldata == NULL)
1964                 goto out;
1965         calldata->inode = state->inode;
1966         calldata->state = state;
1967         calldata->arg.fh = NFS_FH(state->inode);
1968         calldata->arg.stateid = &state->open_stateid;
1969         /* Serialization for the sequence id */
1970         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1971         if (calldata->arg.seqid == NULL)
1972                 goto out_free_calldata;
1973         calldata->arg.fmode = 0;
1974         calldata->arg.bitmask = server->cache_consistency_bitmask;
1975         calldata->res.fattr = &calldata->fattr;
1976         calldata->res.seqid = calldata->arg.seqid;
1977         calldata->res.server = server;
1978         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1979         path_get(path);
1980         calldata->path = *path;
1981
1982         msg.rpc_argp = &calldata->arg,
1983         msg.rpc_resp = &calldata->res,
1984         task_setup_data.callback_data = calldata;
1985         task = rpc_run_task(&task_setup_data);
1986         if (IS_ERR(task))
1987                 return PTR_ERR(task);
1988         status = 0;
1989         if (wait)
1990                 status = rpc_wait_for_completion_task(task);
1991         rpc_put_task(task);
1992         return status;
1993 out_free_calldata:
1994         kfree(calldata);
1995 out:
1996         nfs4_put_open_state(state);
1997         nfs4_put_state_owner(sp);
1998         return status;
1999 }
2000
2001 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
2002 {
2003         struct file *filp;
2004         int ret;
2005
2006         /* If the open_intent is for execute, we have an extra check to make */
2007         if (fmode & FMODE_EXEC) {
2008                 ret = nfs_may_open(state->inode,
2009                                 state->owner->so_cred,
2010                                 nd->intent.open.flags);
2011                 if (ret < 0)
2012                         goto out_close;
2013         }
2014         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
2015         if (!IS_ERR(filp)) {
2016                 struct nfs_open_context *ctx;
2017                 ctx = nfs_file_open_context(filp);
2018                 ctx->state = state;
2019                 return 0;
2020         }
2021         ret = PTR_ERR(filp);
2022 out_close:
2023         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
2024         return ret;
2025 }
2026
2027 struct dentry *
2028 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2029 {
2030         struct path path = {
2031                 .mnt = nd->path.mnt,
2032                 .dentry = dentry,
2033         };
2034         struct dentry *parent;
2035         struct iattr attr;
2036         struct rpc_cred *cred;
2037         struct nfs4_state *state;
2038         struct dentry *res;
2039         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2040
2041         if (nd->flags & LOOKUP_CREATE) {
2042                 attr.ia_mode = nd->intent.open.create_mode;
2043                 attr.ia_valid = ATTR_MODE;
2044                 if (!IS_POSIXACL(dir))
2045                         attr.ia_mode &= ~current_umask();
2046         } else {
2047                 attr.ia_valid = 0;
2048                 BUG_ON(nd->intent.open.flags & O_CREAT);
2049         }
2050
2051         cred = rpc_lookup_cred();
2052         if (IS_ERR(cred))
2053                 return (struct dentry *)cred;
2054         parent = dentry->d_parent;
2055         /* Protect against concurrent sillydeletes */
2056         nfs_block_sillyrename(parent);
2057         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2058         put_rpccred(cred);
2059         if (IS_ERR(state)) {
2060                 if (PTR_ERR(state) == -ENOENT) {
2061                         d_add(dentry, NULL);
2062                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2063                 }
2064                 nfs_unblock_sillyrename(parent);
2065                 return (struct dentry *)state;
2066         }
2067         res = d_add_unique(dentry, igrab(state->inode));
2068         if (res != NULL)
2069                 path.dentry = res;
2070         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2071         nfs_unblock_sillyrename(parent);
2072         nfs4_intent_set_file(nd, &path, state, fmode);
2073         return res;
2074 }
2075
2076 int
2077 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2078 {
2079         struct path path = {
2080                 .mnt = nd->path.mnt,
2081                 .dentry = dentry,
2082         };
2083         struct rpc_cred *cred;
2084         struct nfs4_state *state;
2085         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2086
2087         cred = rpc_lookup_cred();
2088         if (IS_ERR(cred))
2089                 return PTR_ERR(cred);
2090         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2091         put_rpccred(cred);
2092         if (IS_ERR(state)) {
2093                 switch (PTR_ERR(state)) {
2094                         case -EPERM:
2095                         case -EACCES:
2096                         case -EDQUOT:
2097                         case -ENOSPC:
2098                         case -EROFS:
2099                                 return PTR_ERR(state);
2100                         default:
2101                                 goto out_drop;
2102                 }
2103         }
2104         if (state->inode == dentry->d_inode) {
2105                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2106                 nfs4_intent_set_file(nd, &path, state, fmode);
2107                 return 1;
2108         }
2109         nfs4_close_sync(&path, state, fmode);
2110 out_drop:
2111         d_drop(dentry);
2112         return 0;
2113 }
2114
2115 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2116 {
2117         if (ctx->state == NULL)
2118                 return;
2119         if (is_sync)
2120                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2121         else
2122                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2123 }
2124
2125 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2126 {
2127         struct nfs4_server_caps_arg args = {
2128                 .fhandle = fhandle,
2129         };
2130         struct nfs4_server_caps_res res = {};
2131         struct rpc_message msg = {
2132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2133                 .rpc_argp = &args,
2134                 .rpc_resp = &res,
2135         };
2136         int status;
2137
2138         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2139         if (status == 0) {
2140                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2141                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2142                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2143                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2144                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2145                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2146                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2147                         server->caps |= NFS_CAP_ACLS;
2148                 if (res.has_links != 0)
2149                         server->caps |= NFS_CAP_HARDLINKS;
2150                 if (res.has_symlinks != 0)
2151                         server->caps |= NFS_CAP_SYMLINKS;
2152                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2153                         server->caps |= NFS_CAP_FILEID;
2154                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2155                         server->caps |= NFS_CAP_MODE;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2157                         server->caps |= NFS_CAP_NLINK;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2159                         server->caps |= NFS_CAP_OWNER;
2160                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2161                         server->caps |= NFS_CAP_OWNER_GROUP;
2162                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2163                         server->caps |= NFS_CAP_ATIME;
2164                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2165                         server->caps |= NFS_CAP_CTIME;
2166                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2167                         server->caps |= NFS_CAP_MTIME;
2168
2169                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2170                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2171                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2172                 server->acl_bitmask = res.acl_bitmask;
2173         }
2174
2175         return status;
2176 }
2177
2178 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2179 {
2180         struct nfs4_exception exception = { };
2181         int err;
2182         do {
2183                 err = nfs4_handle_exception(server,
2184                                 _nfs4_server_capabilities(server, fhandle),
2185                                 &exception);
2186         } while (exception.retry);
2187         return err;
2188 }
2189
2190 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2191                 struct nfs_fsinfo *info)
2192 {
2193         struct nfs4_lookup_root_arg args = {
2194                 .bitmask = nfs4_fattr_bitmap,
2195         };
2196         struct nfs4_lookup_res res = {
2197                 .server = server,
2198                 .fattr = info->fattr,
2199                 .fh = fhandle,
2200         };
2201         struct rpc_message msg = {
2202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2203                 .rpc_argp = &args,
2204                 .rpc_resp = &res,
2205         };
2206
2207         nfs_fattr_init(info->fattr);
2208         return nfs4_call_sync(server, &msg, &args, &res, 0);
2209 }
2210
2211 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2212                 struct nfs_fsinfo *info)
2213 {
2214         struct nfs4_exception exception = { };
2215         int err;
2216         do {
2217                 err = nfs4_handle_exception(server,
2218                                 _nfs4_lookup_root(server, fhandle, info),
2219                                 &exception);
2220         } while (exception.retry);
2221         return err;
2222 }
2223
2224 /*
2225  * get the file handle for the "/" directory on the server
2226  */
2227 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2228                               struct nfs_fsinfo *info)
2229 {
2230         int status;
2231
2232         status = nfs4_lookup_root(server, fhandle, info);
2233         if (status == 0)
2234                 status = nfs4_server_capabilities(server, fhandle);
2235         if (status == 0)
2236                 status = nfs4_do_fsinfo(server, fhandle, info);
2237         return nfs4_map_errors(status);
2238 }
2239
2240 /*
2241  * Get locations and (maybe) other attributes of a referral.
2242  * Note that we'll actually follow the referral later when
2243  * we detect fsid mismatch in inode revalidation
2244  */
2245 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2246 {
2247         int status = -ENOMEM;
2248         struct page *page = NULL;
2249         struct nfs4_fs_locations *locations = NULL;
2250
2251         page = alloc_page(GFP_KERNEL);
2252         if (page == NULL)
2253                 goto out;
2254         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2255         if (locations == NULL)
2256                 goto out;
2257
2258         status = nfs4_proc_fs_locations(dir, name, locations, page);
2259         if (status != 0)
2260                 goto out;
2261         /* Make sure server returned a different fsid for the referral */
2262         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2263                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2264                 status = -EIO;
2265                 goto out;
2266         }
2267
2268         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2269         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2270         if (!fattr->mode)
2271                 fattr->mode = S_IFDIR;
2272         memset(fhandle, 0, sizeof(struct nfs_fh));
2273 out:
2274         if (page)
2275                 __free_page(page);
2276         kfree(locations);
2277         return status;
2278 }
2279
2280 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2281 {
2282         struct nfs4_getattr_arg args = {
2283                 .fh = fhandle,
2284                 .bitmask = server->attr_bitmask,
2285         };
2286         struct nfs4_getattr_res res = {
2287                 .fattr = fattr,
2288                 .server = server,
2289         };
2290         struct rpc_message msg = {
2291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2292                 .rpc_argp = &args,
2293                 .rpc_resp = &res,
2294         };
2295
2296         nfs_fattr_init(fattr);
2297         return nfs4_call_sync(server, &msg, &args, &res, 0);
2298 }
2299
2300 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2301 {
2302         struct nfs4_exception exception = { };
2303         int err;
2304         do {
2305                 err = nfs4_handle_exception(server,
2306                                 _nfs4_proc_getattr(server, fhandle, fattr),
2307                                 &exception);
2308         } while (exception.retry);
2309         return err;
2310 }
2311
2312 /*
2313  * The file is not closed if it is opened due to the a request to change
2314  * the size of the file. The open call will not be needed once the
2315  * VFS layer lookup-intents are implemented.
2316  *
2317  * Close is called when the inode is destroyed.
2318  * If we haven't opened the file for O_WRONLY, we
2319  * need to in the size_change case to obtain a stateid.
2320  *
2321  * Got race?
2322  * Because OPEN is always done by name in nfsv4, it is
2323  * possible that we opened a different file by the same
2324  * name.  We can recognize this race condition, but we
2325  * can't do anything about it besides returning an error.
2326  *
2327  * This will be fixed with VFS changes (lookup-intent).
2328  */
2329 static int
2330 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2331                   struct iattr *sattr)
2332 {
2333         struct inode *inode = dentry->d_inode;
2334         struct rpc_cred *cred = NULL;
2335         struct nfs4_state *state = NULL;
2336         int status;
2337
2338         nfs_fattr_init(fattr);
2339
2340         /* Search for an existing open(O_WRITE) file */
2341         if (sattr->ia_valid & ATTR_FILE) {
2342                 struct nfs_open_context *ctx;
2343
2344                 ctx = nfs_file_open_context(sattr->ia_file);
2345                 if (ctx) {
2346                         cred = ctx->cred;
2347                         state = ctx->state;
2348                 }
2349         }
2350
2351         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2352         if (status == 0)
2353                 nfs_setattr_update_inode(inode, sattr);
2354         return status;
2355 }
2356
2357 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2358                 const struct qstr *name, struct nfs_fh *fhandle,
2359                 struct nfs_fattr *fattr)
2360 {
2361         int                    status;
2362         struct nfs4_lookup_arg args = {
2363                 .bitmask = server->attr_bitmask,
2364                 .dir_fh = dirfh,
2365                 .name = name,
2366         };
2367         struct nfs4_lookup_res res = {
2368                 .server = server,
2369                 .fattr = fattr,
2370                 .fh = fhandle,
2371         };
2372         struct rpc_message msg = {
2373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2374                 .rpc_argp = &args,
2375                 .rpc_resp = &res,
2376         };
2377
2378         nfs_fattr_init(fattr);
2379
2380         dprintk("NFS call  lookupfh %s\n", name->name);
2381         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2382         dprintk("NFS reply lookupfh: %d\n", status);
2383         return status;
2384 }
2385
2386 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2387                               struct qstr *name, struct nfs_fh *fhandle,
2388                               struct nfs_fattr *fattr)
2389 {
2390         struct nfs4_exception exception = { };
2391         int err;
2392         do {
2393                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2394                 /* FIXME: !!!! */
2395                 if (err == -NFS4ERR_MOVED) {
2396                         err = -EREMOTE;
2397                         break;
2398                 }
2399                 err = nfs4_handle_exception(server, err, &exception);
2400         } while (exception.retry);
2401         return err;
2402 }
2403
2404 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2405                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2406 {
2407         int status;
2408
2409         dprintk("NFS call  lookup %s\n", name->name);
2410         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2411         if (status == -NFS4ERR_MOVED)
2412                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2413         dprintk("NFS reply lookup: %d\n", status);
2414         return status;
2415 }
2416
2417 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2418 {
2419         struct nfs4_exception exception = { };
2420         int err;
2421         do {
2422                 err = nfs4_handle_exception(NFS_SERVER(dir),
2423                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2424                                 &exception);
2425         } while (exception.retry);
2426         return err;
2427 }
2428
2429 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2430 {
2431         struct nfs_server *server = NFS_SERVER(inode);
2432         struct nfs4_accessargs args = {
2433                 .fh = NFS_FH(inode),
2434                 .bitmask = server->attr_bitmask,
2435         };
2436         struct nfs4_accessres res = {
2437                 .server = server,
2438         };
2439         struct rpc_message msg = {
2440                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2441                 .rpc_argp = &args,
2442                 .rpc_resp = &res,
2443                 .rpc_cred = entry->cred,
2444         };
2445         int mode = entry->mask;
2446         int status;
2447
2448         /*
2449          * Determine which access bits we want to ask for...
2450          */
2451         if (mode & MAY_READ)
2452                 args.access |= NFS4_ACCESS_READ;
2453         if (S_ISDIR(inode->i_mode)) {
2454                 if (mode & MAY_WRITE)
2455                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2456                 if (mode & MAY_EXEC)
2457                         args.access |= NFS4_ACCESS_LOOKUP;
2458         } else {
2459                 if (mode & MAY_WRITE)
2460                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2461                 if (mode & MAY_EXEC)
2462                         args.access |= NFS4_ACCESS_EXECUTE;
2463         }
2464
2465         res.fattr = nfs_alloc_fattr();
2466         if (res.fattr == NULL)
2467                 return -ENOMEM;
2468
2469         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2470         if (!status) {
2471                 entry->mask = 0;
2472                 if (res.access & NFS4_ACCESS_READ)
2473                         entry->mask |= MAY_READ;
2474                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2475                         entry->mask |= MAY_WRITE;
2476                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2477                         entry->mask |= MAY_EXEC;
2478                 nfs_refresh_inode(inode, res.fattr);
2479         }
2480         nfs_free_fattr(res.fattr);
2481         return status;
2482 }
2483
2484 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2485 {
2486         struct nfs4_exception exception = { };
2487         int err;
2488         do {
2489                 err = nfs4_handle_exception(NFS_SERVER(inode),
2490                                 _nfs4_proc_access(inode, entry),
2491                                 &exception);
2492         } while (exception.retry);
2493         return err;
2494 }
2495
2496 /*
2497  * TODO: For the time being, we don't try to get any attributes
2498  * along with any of the zero-copy operations READ, READDIR,
2499  * READLINK, WRITE.
2500  *
2501  * In the case of the first three, we want to put the GETATTR
2502  * after the read-type operation -- this is because it is hard
2503  * to predict the length of a GETATTR response in v4, and thus
2504  * align the READ data correctly.  This means that the GETATTR
2505  * may end up partially falling into the page cache, and we should
2506  * shift it into the 'tail' of the xdr_buf before processing.
2507  * To do this efficiently, we need to know the total length
2508  * of data received, which doesn't seem to be available outside
2509  * of the RPC layer.
2510  *
2511  * In the case of WRITE, we also want to put the GETATTR after
2512  * the operation -- in this case because we want to make sure
2513  * we get the post-operation mtime and size.  This means that
2514  * we can't use xdr_encode_pages() as written: we need a variant
2515  * of it which would leave room in the 'tail' iovec.
2516  *
2517  * Both of these changes to the XDR layer would in fact be quite
2518  * minor, but I decided to leave them for a subsequent patch.
2519  */
2520 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2521                 unsigned int pgbase, unsigned int pglen)
2522 {
2523         struct nfs4_readlink args = {
2524                 .fh       = NFS_FH(inode),
2525                 .pgbase   = pgbase,
2526                 .pglen    = pglen,
2527                 .pages    = &page,
2528         };
2529         struct nfs4_readlink_res res;
2530         struct rpc_message msg = {
2531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2532                 .rpc_argp = &args,
2533                 .rpc_resp = &res,
2534         };
2535
2536         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2537 }
2538
2539 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2540                 unsigned int pgbase, unsigned int pglen)
2541 {
2542         struct nfs4_exception exception = { };
2543         int err;
2544         do {
2545                 err = nfs4_handle_exception(NFS_SERVER(inode),
2546                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2547                                 &exception);
2548         } while (exception.retry);
2549         return err;
2550 }
2551
2552 /*
2553  * Got race?
2554  * We will need to arrange for the VFS layer to provide an atomic open.
2555  * Until then, this create/open method is prone to inefficiency and race
2556  * conditions due to the lookup, create, and open VFS calls from sys_open()
2557  * placed on the wire.
2558  *
2559  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2560  * The file will be opened again in the subsequent VFS open call
2561  * (nfs4_proc_file_open).
2562  *
2563  * The open for read will just hang around to be used by any process that
2564  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2565  */
2566
2567 static int
2568 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2569                  int flags, struct nameidata *nd)
2570 {
2571         struct path path = {
2572                 .mnt = nd->path.mnt,
2573                 .dentry = dentry,
2574         };
2575         struct nfs4_state *state;
2576         struct rpc_cred *cred;
2577         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2578         int status = 0;
2579
2580         cred = rpc_lookup_cred();
2581         if (IS_ERR(cred)) {
2582                 status = PTR_ERR(cred);
2583                 goto out;
2584         }
2585         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2586         d_drop(dentry);
2587         if (IS_ERR(state)) {
2588                 status = PTR_ERR(state);
2589                 goto out_putcred;
2590         }
2591         d_add(dentry, igrab(state->inode));
2592         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2593         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2594                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2595         else
2596                 nfs4_close_sync(&path, state, fmode);
2597 out_putcred:
2598         put_rpccred(cred);
2599 out:
2600         return status;
2601 }
2602
2603 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2604 {
2605         struct nfs_server *server = NFS_SERVER(dir);
2606         struct nfs_removeargs args = {
2607                 .fh = NFS_FH(dir),
2608                 .name.len = name->len,
2609                 .name.name = name->name,
2610                 .bitmask = server->attr_bitmask,
2611         };
2612         struct nfs_removeres res = {
2613                 .server = server,
2614         };
2615         struct rpc_message msg = {
2616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2617                 .rpc_argp = &args,
2618                 .rpc_resp = &res,
2619         };
2620         int status = -ENOMEM;
2621
2622         res.dir_attr = nfs_alloc_fattr();
2623         if (res.dir_attr == NULL)
2624                 goto out;
2625
2626         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2627         if (status == 0) {
2628                 update_changeattr(dir, &res.cinfo);
2629                 nfs_post_op_update_inode(dir, res.dir_attr);
2630         }
2631         nfs_free_fattr(res.dir_attr);
2632 out:
2633         return status;
2634 }
2635
2636 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2637 {
2638         struct nfs4_exception exception = { };
2639         int err;
2640         do {
2641                 err = nfs4_handle_exception(NFS_SERVER(dir),
2642                                 _nfs4_proc_remove(dir, name),
2643                                 &exception);
2644         } while (exception.retry);
2645         return err;
2646 }
2647
2648 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2649 {
2650         struct nfs_server *server = NFS_SERVER(dir);
2651         struct nfs_removeargs *args = msg->rpc_argp;
2652         struct nfs_removeres *res = msg->rpc_resp;
2653
2654         args->bitmask = server->cache_consistency_bitmask;
2655         res->server = server;
2656         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2657 }
2658
2659 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2660 {
2661         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2662
2663         if (!nfs4_sequence_done(task, &res->seq_res))
2664                 return 0;
2665         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2666                 return 0;
2667         update_changeattr(dir, &res->cinfo);
2668         nfs_post_op_update_inode(dir, res->dir_attr);
2669         return 1;
2670 }
2671
2672 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2673                 struct inode *new_dir, struct qstr *new_name)
2674 {
2675         struct nfs_server *server = NFS_SERVER(old_dir);
2676         struct nfs4_rename_arg arg = {
2677                 .old_dir = NFS_FH(old_dir),
2678                 .new_dir = NFS_FH(new_dir),
2679                 .old_name = old_name,
2680                 .new_name = new_name,
2681                 .bitmask = server->attr_bitmask,
2682         };
2683         struct nfs4_rename_res res = {
2684                 .server = server,
2685         };
2686         struct rpc_message msg = {
2687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2688                 .rpc_argp = &arg,
2689                 .rpc_resp = &res,
2690         };
2691         int status = -ENOMEM;
2692
2693         res.old_fattr = nfs_alloc_fattr();
2694         res.new_fattr = nfs_alloc_fattr();
2695         if (res.old_fattr == NULL || res.new_fattr == NULL)
2696                 goto out;
2697
2698         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2699         if (!status) {
2700                 update_changeattr(old_dir, &res.old_cinfo);
2701                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2702                 update_changeattr(new_dir, &res.new_cinfo);
2703                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2704         }
2705 out:
2706         nfs_free_fattr(res.new_fattr);
2707         nfs_free_fattr(res.old_fattr);
2708         return status;
2709 }
2710
2711 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2712                 struct inode *new_dir, struct qstr *new_name)
2713 {
2714         struct nfs4_exception exception = { };
2715         int err;
2716         do {
2717                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2718                                 _nfs4_proc_rename(old_dir, old_name,
2719                                         new_dir, new_name),
2720                                 &exception);
2721         } while (exception.retry);
2722         return err;
2723 }
2724
2725 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2726 {
2727         struct nfs_server *server = NFS_SERVER(inode);
2728         struct nfs4_link_arg arg = {
2729                 .fh     = NFS_FH(inode),
2730                 .dir_fh = NFS_FH(dir),
2731                 .name   = name,
2732                 .bitmask = server->attr_bitmask,
2733         };
2734         struct nfs4_link_res res = {
2735                 .server = server,
2736         };
2737         struct rpc_message msg = {
2738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2739                 .rpc_argp = &arg,
2740                 .rpc_resp = &res,
2741         };
2742         int status = -ENOMEM;
2743
2744         res.fattr = nfs_alloc_fattr();
2745         res.dir_attr = nfs_alloc_fattr();
2746         if (res.fattr == NULL || res.dir_attr == NULL)
2747                 goto out;
2748
2749         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2750         if (!status) {
2751                 update_changeattr(dir, &res.cinfo);
2752                 nfs_post_op_update_inode(dir, res.dir_attr);
2753                 nfs_post_op_update_inode(inode, res.fattr);
2754         }
2755 out:
2756         nfs_free_fattr(res.dir_attr);
2757         nfs_free_fattr(res.fattr);
2758         return status;
2759 }
2760
2761 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2762 {
2763         struct nfs4_exception exception = { };
2764         int err;
2765         do {
2766                 err = nfs4_handle_exception(NFS_SERVER(inode),
2767                                 _nfs4_proc_link(inode, dir, name),
2768                                 &exception);
2769         } while (exception.retry);
2770         return err;
2771 }
2772
2773 struct nfs4_createdata {
2774         struct rpc_message msg;
2775         struct nfs4_create_arg arg;
2776         struct nfs4_create_res res;
2777         struct nfs_fh fh;
2778         struct nfs_fattr fattr;
2779         struct nfs_fattr dir_fattr;
2780 };
2781
2782 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2783                 struct qstr *name, struct iattr *sattr, u32 ftype)
2784 {
2785         struct nfs4_createdata *data;
2786
2787         data = kzalloc(sizeof(*data), GFP_KERNEL);
2788         if (data != NULL) {
2789                 struct nfs_server *server = NFS_SERVER(dir);
2790
2791                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2792                 data->msg.rpc_argp = &data->arg;
2793                 data->msg.rpc_resp = &data->res;
2794                 data->arg.dir_fh = NFS_FH(dir);
2795                 data->arg.server = server;
2796                 data->arg.name = name;
2797                 data->arg.attrs = sattr;
2798                 data->arg.ftype = ftype;
2799                 data->arg.bitmask = server->attr_bitmask;
2800                 data->res.server = server;
2801                 data->res.fh = &data->fh;
2802                 data->res.fattr = &data->fattr;
2803                 data->res.dir_fattr = &data->dir_fattr;
2804                 nfs_fattr_init(data->res.fattr);
2805                 nfs_fattr_init(data->res.dir_fattr);
2806         }
2807         return data;
2808 }
2809
2810 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2811 {
2812         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2813                                     &data->arg, &data->res, 1);
2814         if (status == 0) {
2815                 update_changeattr(dir, &data->res.dir_cinfo);
2816                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2817                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2818         }
2819         return status;
2820 }
2821
2822 static void nfs4_free_createdata(struct nfs4_createdata *data)
2823 {
2824         kfree(data);
2825 }
2826
2827 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2828                 struct page *page, unsigned int len, struct iattr *sattr)
2829 {
2830         struct nfs4_createdata *data;
2831         int status = -ENAMETOOLONG;
2832
2833         if (len > NFS4_MAXPATHLEN)
2834                 goto out;
2835
2836         status = -ENOMEM;
2837         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2838         if (data == NULL)
2839                 goto out;
2840
2841         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2842         data->arg.u.symlink.pages = &page;
2843         data->arg.u.symlink.len = len;
2844
2845         status = nfs4_do_create(dir, dentry, data);
2846
2847         nfs4_free_createdata(data);
2848 out:
2849         return status;
2850 }
2851
2852 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2853                 struct page *page, unsigned int len, struct iattr *sattr)
2854 {
2855         struct nfs4_exception exception = { };
2856         int err;
2857         do {
2858                 err = nfs4_handle_exception(NFS_SERVER(dir),
2859                                 _nfs4_proc_symlink(dir, dentry, page,
2860                                                         len, sattr),
2861                                 &exception);
2862         } while (exception.retry);
2863         return err;
2864 }
2865
2866 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2867                 struct iattr *sattr)
2868 {
2869         struct nfs4_createdata *data;
2870         int status = -ENOMEM;
2871
2872         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2873         if (data == NULL)
2874                 goto out;
2875
2876         status = nfs4_do_create(dir, dentry, data);
2877
2878         nfs4_free_createdata(data);
2879 out:
2880         return status;
2881 }
2882
2883 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2884                 struct iattr *sattr)
2885 {
2886         struct nfs4_exception exception = { };
2887         int err;
2888         do {
2889                 err = nfs4_handle_exception(NFS_SERVER(dir),
2890                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2891                                 &exception);
2892         } while (exception.retry);
2893         return err;
2894 }
2895
2896 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2897                   u64 cookie, struct page *page, unsigned int count, int plus)
2898 {
2899         struct inode            *dir = dentry->d_inode;
2900         struct nfs4_readdir_arg args = {
2901                 .fh = NFS_FH(dir),
2902                 .pages = &page,
2903                 .pgbase = 0,
2904                 .count = count,
2905                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2906         };
2907         struct nfs4_readdir_res res;
2908         struct rpc_message msg = {
2909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2910                 .rpc_argp = &args,
2911                 .rpc_resp = &res,
2912                 .rpc_cred = cred,
2913         };
2914         int                     status;
2915
2916         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2917                         dentry->d_parent->d_name.name,
2918                         dentry->d_name.name,
2919                         (unsigned long long)cookie);
2920         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2921         res.pgbase = args.pgbase;
2922         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2923         if (status == 0)
2924                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2925
2926         nfs_invalidate_atime(dir);
2927
2928         dprintk("%s: returns %d\n", __func__, status);
2929         return status;
2930 }
2931
2932 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2933                   u64 cookie, struct page *page, unsigned int count, int plus)
2934 {
2935         struct nfs4_exception exception = { };
2936         int err;
2937         do {
2938                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2939                                 _nfs4_proc_readdir(dentry, cred, cookie,
2940                                         page, count, plus),
2941                                 &exception);
2942         } while (exception.retry);
2943         return err;
2944 }
2945
2946 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2947                 struct iattr *sattr, dev_t rdev)
2948 {
2949         struct nfs4_createdata *data;
2950         int mode = sattr->ia_mode;
2951         int status = -ENOMEM;
2952
2953         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2954         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2955
2956         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2957         if (data == NULL)
2958                 goto out;
2959
2960         if (S_ISFIFO(mode))
2961                 data->arg.ftype = NF4FIFO;
2962         else if (S_ISBLK(mode)) {
2963                 data->arg.ftype = NF4BLK;
2964                 data->arg.u.device.specdata1 = MAJOR(rdev);
2965                 data->arg.u.device.specdata2 = MINOR(rdev);
2966         }
2967         else if (S_ISCHR(mode)) {
2968                 data->arg.ftype = NF4CHR;
2969                 data->arg.u.device.specdata1 = MAJOR(rdev);
2970                 data->arg.u.device.specdata2 = MINOR(rdev);
2971         }
2972
2973         status = nfs4_do_create(dir, dentry, data);
2974
2975         nfs4_free_createdata(data);
2976 out:
2977         return status;
2978 }
2979
2980 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2981                 struct iattr *sattr, dev_t rdev)
2982 {
2983         struct nfs4_exception exception = { };
2984         int err;
2985         do {
2986                 err = nfs4_handle_exception(NFS_SERVER(dir),
2987                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2988                                 &exception);
2989         } while (exception.retry);
2990         return err;
2991 }
2992
2993 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2994                  struct nfs_fsstat *fsstat)
2995 {
2996         struct nfs4_statfs_arg args = {
2997                 .fh = fhandle,
2998                 .bitmask = server->attr_bitmask,
2999         };
3000         struct nfs4_statfs_res res = {
3001                 .fsstat = fsstat,
3002         };
3003         struct rpc_message msg = {
3004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3005                 .rpc_argp = &args,
3006                 .rpc_resp = &res,
3007         };
3008
3009         nfs_fattr_init(fsstat->fattr);
3010         return  nfs4_call_sync(server, &msg, &args, &res, 0);
3011 }
3012
3013 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3014 {
3015         struct nfs4_exception exception = { };
3016         int err;
3017         do {
3018                 err = nfs4_handle_exception(server,
3019                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3020                                 &exception);
3021         } while (exception.retry);
3022         return err;
3023 }
3024
3025 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3026                 struct nfs_fsinfo *fsinfo)
3027 {
3028         struct nfs4_fsinfo_arg args = {
3029                 .fh = fhandle,
3030                 .bitmask = server->attr_bitmask,
3031         };
3032         struct nfs4_fsinfo_res res = {
3033                 .fsinfo = fsinfo,
3034         };
3035         struct rpc_message msg = {
3036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3037                 .rpc_argp = &args,
3038                 .rpc_resp = &res,
3039         };
3040
3041         return nfs4_call_sync(server, &msg, &args, &res, 0);
3042 }
3043
3044 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3045 {
3046         struct nfs4_exception exception = { };
3047         int err;
3048
3049         do {
3050                 err = nfs4_handle_exception(server,
3051                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3052                                 &exception);
3053         } while (exception.retry);
3054         return err;
3055 }
3056
3057 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3058 {
3059         nfs_fattr_init(fsinfo->fattr);
3060         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3061 }
3062
3063 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3064                 struct nfs_pathconf *pathconf)
3065 {
3066         struct nfs4_pathconf_arg args = {
3067                 .fh = fhandle,
3068                 .bitmask = server->attr_bitmask,
3069         };
3070         struct nfs4_pathconf_res res = {
3071                 .pathconf = pathconf,
3072         };
3073         struct rpc_message msg = {
3074                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3075                 .rpc_argp = &args,
3076                 .rpc_resp = &res,
3077         };
3078
3079         /* None of the pathconf attributes are mandatory to implement */
3080         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3081                 memset(pathconf, 0, sizeof(*pathconf));
3082                 return 0;
3083         }
3084
3085         nfs_fattr_init(pathconf->fattr);
3086         return nfs4_call_sync(server, &msg, &args, &res, 0);
3087 }
3088
3089 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3090                 struct nfs_pathconf *pathconf)
3091 {
3092         struct nfs4_exception exception = { };
3093         int err;
3094
3095         do {
3096                 err = nfs4_handle_exception(server,
3097                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3098                                 &exception);
3099         } while (exception.retry);
3100         return err;
3101 }
3102
3103 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3104 {
3105         struct nfs_server *server = NFS_SERVER(data->inode);
3106
3107         dprintk("--> %s\n", __func__);
3108
3109         if (!nfs4_sequence_done(task, &data->res.seq_res))
3110                 return -EAGAIN;
3111
3112         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3113                 nfs_restart_rpc(task, server->nfs_client);
3114                 return -EAGAIN;
3115         }
3116
3117         nfs_invalidate_atime(data->inode);
3118         if (task->tk_status > 0)
3119                 renew_lease(server, data->timestamp);
3120         return 0;
3121 }
3122
3123 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3124 {
3125         data->timestamp   = jiffies;
3126         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3127 }
3128
3129 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3130 {
3131         struct inode *inode = data->inode;
3132
3133         if (!nfs4_sequence_done(task, &data->res.seq_res))
3134                 return -EAGAIN;
3135
3136         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3137                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3138                 return -EAGAIN;
3139         }
3140         if (task->tk_status >= 0) {
3141                 renew_lease(NFS_SERVER(inode), data->timestamp);
3142                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3143         }
3144         return 0;
3145 }
3146
3147 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3148 {
3149         struct nfs_server *server = NFS_SERVER(data->inode);
3150
3151         data->args.bitmask = server->cache_consistency_bitmask;
3152         data->res.server = server;
3153         data->timestamp   = jiffies;
3154
3155         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3156 }
3157
3158 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3159 {
3160         struct inode *inode = data->inode;
3161
3162         if (!nfs4_sequence_done(task, &data->res.seq_res))
3163                 return -EAGAIN;
3164
3165         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3166                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3167                 return -EAGAIN;
3168         }
3169         nfs_refresh_inode(inode, data->res.fattr);
3170         return 0;
3171 }
3172
3173 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3174 {
3175         struct nfs_server *server = NFS_SERVER(data->inode);
3176
3177         data->args.bitmask = server->cache_consistency_bitmask;
3178         data->res.server = server;
3179         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3180 }
3181
3182 struct nfs4_renewdata {
3183         struct nfs_client       *client;
3184         unsigned long           timestamp;
3185 };
3186
3187 /*
3188  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3189  * standalone procedure for queueing an asynchronous RENEW.
3190  */
3191 static void nfs4_renew_release(void *calldata)
3192 {
3193         struct nfs4_renewdata *data = calldata;
3194         struct nfs_client *clp = data->client;
3195
3196         if (atomic_read(&clp->cl_count) > 1)
3197                 nfs4_schedule_state_renewal(clp);
3198         nfs_put_client(clp);
3199         kfree(data);
3200 }
3201
3202 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3203 {
3204         struct nfs4_renewdata *data = calldata;
3205         struct nfs_client *clp = data->client;
3206         unsigned long timestamp = data->timestamp;
3207
3208         if (task->tk_status < 0) {
3209                 /* Unless we're shutting down, schedule state recovery! */
3210                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3211                         nfs4_schedule_state_recovery(clp);
3212                 return;
3213         }
3214         do_renew_lease(clp, timestamp);
3215 }
3216
3217 static const struct rpc_call_ops nfs4_renew_ops = {
3218         .rpc_call_done = nfs4_renew_done,
3219         .rpc_release = nfs4_renew_release,
3220 };
3221
3222 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3223 {
3224         struct rpc_message msg = {
3225                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3226                 .rpc_argp       = clp,
3227                 .rpc_cred       = cred,
3228         };
3229         struct nfs4_renewdata *data;
3230
3231         if (!atomic_inc_not_zero(&clp->cl_count))
3232                 return -EIO;
3233         data = kmalloc(sizeof(*data), GFP_KERNEL);
3234         if (data == NULL)
3235                 return -ENOMEM;
3236         data->client = clp;
3237         data->timestamp = jiffies;
3238         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3239                         &nfs4_renew_ops, data);
3240 }
3241
3242 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3243 {
3244         struct rpc_message msg = {
3245                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3246                 .rpc_argp       = clp,
3247                 .rpc_cred       = cred,
3248         };
3249         unsigned long now = jiffies;
3250         int status;
3251
3252         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3253         if (status < 0)
3254                 return status;
3255         do_renew_lease(clp, now);
3256         return 0;
3257 }
3258
3259 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3260 {
3261         return (server->caps & NFS_CAP_ACLS)
3262                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3263                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3264 }
3265
3266 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3267  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3268  * the stack.
3269  */
3270 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3271
3272 static void buf_to_pages(const void *buf, size_t buflen,
3273                 struct page **pages, unsigned int *pgbase)
3274 {
3275         const void *p = buf;
3276
3277         *pgbase = offset_in_page(buf);
3278         p -= *pgbase;
3279         while (p < buf + buflen) {
3280                 *(pages++) = virt_to_page(p);
3281                 p += PAGE_CACHE_SIZE;
3282         }
3283 }
3284
3285 struct nfs4_cached_acl {
3286         int cached;
3287         size_t len;
3288         char data[0];
3289 };
3290
3291 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3292 {
3293         struct nfs_inode *nfsi = NFS_I(inode);
3294
3295         spin_lock(&inode->i_lock);
3296         kfree(nfsi->nfs4_acl);
3297         nfsi->nfs4_acl = acl;
3298         spin_unlock(&inode->i_lock);
3299 }
3300
3301 static void nfs4_zap_acl_attr(struct inode *inode)
3302 {
3303         nfs4_set_cached_acl(inode, NULL);
3304 }
3305
3306 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3307 {
3308         struct nfs_inode *nfsi = NFS_I(inode);
3309         struct nfs4_cached_acl *acl;
3310         int ret = -ENOENT;
3311
3312         spin_lock(&inode->i_lock);
3313         acl = nfsi->nfs4_acl;
3314         if (acl == NULL)
3315                 goto out;
3316         if (buf == NULL) /* user is just asking for length */
3317                 goto out_len;
3318         if (acl->cached == 0)
3319                 goto out;
3320         ret = -ERANGE; /* see getxattr(2) man page */
3321         if (acl->len > buflen)
3322                 goto out;
3323         memcpy(buf, acl->data, acl->len);
3324 out_len:
3325         ret = acl->len;
3326 out:
3327         spin_unlock(&inode->i_lock);
3328         return ret;
3329 }
3330
3331 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3332 {
3333         struct nfs4_cached_acl *acl;
3334
3335         if (buf && acl_len <= PAGE_SIZE) {
3336                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3337                 if (acl == NULL)
3338                         goto out;
3339                 acl->cached = 1;
3340                 memcpy(acl->data, buf, acl_len);
3341         } else {
3342                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3343                 if (acl == NULL)
3344                         goto out;
3345                 acl->cached = 0;
3346         }
3347         acl->len = acl_len;
3348 out:
3349         nfs4_set_cached_acl(inode, acl);
3350 }
3351
3352 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3353 {
3354         struct page *pages[NFS4ACL_MAXPAGES];
3355         struct nfs_getaclargs args = {
3356                 .fh = NFS_FH(inode),
3357                 .acl_pages = pages,
3358                 .acl_len = buflen,
3359         };
3360         struct nfs_getaclres res = {
3361                 .acl_len = buflen,
3362         };
3363         void *resp_buf;
3364         struct rpc_message msg = {
3365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3366                 .rpc_argp = &args,
3367                 .rpc_resp = &res,
3368         };
3369         struct page *localpage = NULL;
3370         int ret;
3371
3372         if (buflen < PAGE_SIZE) {
3373                 /* As long as we're doing a round trip to the server anyway,
3374                  * let's be prepared for a page of acl data. */
3375                 localpage = alloc_page(GFP_KERNEL);
3376                 resp_buf = page_address(localpage);
3377                 if (localpage == NULL)
3378                         return -ENOMEM;
3379                 args.acl_pages[0] = localpage;
3380                 args.acl_pgbase = 0;
3381                 args.acl_len = PAGE_SIZE;
3382         } else {
3383                 resp_buf = buf;
3384                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3385         }
3386         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3387         if (ret)
3388                 goto out_free;
3389         if (res.acl_len > args.acl_len)
3390                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3391         else
3392                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3393         if (buf) {
3394                 ret = -ERANGE;
3395                 if (res.acl_len > buflen)
3396                         goto out_free;
3397                 if (localpage)
3398                         memcpy(buf, resp_buf, res.acl_len);
3399         }
3400         ret = res.acl_len;
3401 out_free:
3402         if (localpage)
3403                 __free_page(localpage);
3404         return ret;
3405 }
3406
3407 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3408 {
3409         struct nfs4_exception exception = { };
3410         ssize_t ret;
3411         do {
3412                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3413                 if (ret >= 0)
3414                         break;
3415                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3416         } while (exception.retry);
3417         return ret;
3418 }
3419
3420 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3421 {
3422         struct nfs_server *server = NFS_SERVER(inode);
3423         int ret;
3424
3425         if (!nfs4_server_supports_acls(server))
3426                 return -EOPNOTSUPP;
3427         ret = nfs_revalidate_inode(server, inode);
3428         if (ret < 0)
3429                 return ret;
3430         ret = nfs4_read_cached_acl(inode, buf, buflen);
3431         if (ret != -ENOENT)
3432                 return ret;
3433         return nfs4_get_acl_uncached(inode, buf, buflen);
3434 }
3435
3436 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3437 {
3438         struct nfs_server *server = NFS_SERVER(inode);
3439         struct page *pages[NFS4ACL_MAXPAGES];
3440         struct nfs_setaclargs arg = {
3441                 .fh             = NFS_FH(inode),
3442                 .acl_pages      = pages,
3443                 .acl_len        = buflen,
3444         };
3445         struct nfs_setaclres res;
3446         struct rpc_message msg = {
3447                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3448                 .rpc_argp       = &arg,
3449                 .rpc_resp       = &res,
3450         };
3451         int ret;
3452
3453         if (!nfs4_server_supports_acls(server))
3454                 return -EOPNOTSUPP;
3455         nfs_inode_return_delegation(inode);
3456         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3457         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3458         nfs_access_zap_cache(inode);
3459         nfs_zap_acl_cache(inode);
3460         return ret;
3461 }
3462
3463 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3464 {
3465         struct nfs4_exception exception = { };
3466         int err;
3467         do {
3468                 err = nfs4_handle_exception(NFS_SERVER(inode),
3469                                 __nfs4_proc_set_acl(inode, buf, buflen),
3470                                 &exception);
3471         } while (exception.retry);
3472         return err;
3473 }
3474
3475 static int
3476 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3477 {
3478         struct nfs_client *clp = server->nfs_client;
3479
3480         if (task->tk_status >= 0)
3481                 return 0;
3482         switch(task->tk_status) {
3483                 case -NFS4ERR_ADMIN_REVOKED:
3484                 case -NFS4ERR_BAD_STATEID:
3485                 case -NFS4ERR_OPENMODE:
3486                         if (state == NULL)
3487                                 break;
3488                         nfs4_state_mark_reclaim_nograce(clp, state);
3489                         goto do_state_recovery;
3490                 case -NFS4ERR_STALE_STATEID:
3491                         if (state == NULL)
3492                                 break;
3493                         nfs4_state_mark_reclaim_reboot(clp, state);
3494                 case -NFS4ERR_STALE_CLIENTID:
3495                 case -NFS4ERR_EXPIRED:
3496                         goto do_state_recovery;
3497 #if defined(CONFIG_NFS_V4_1)
3498                 case -NFS4ERR_BADSESSION:
3499                 case -NFS4ERR_BADSLOT:
3500                 case -NFS4ERR_BAD_HIGH_SLOT:
3501                 case -NFS4ERR_DEADSESSION:
3502                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3503                 case -NFS4ERR_SEQ_FALSE_RETRY:
3504                 case -NFS4ERR_SEQ_MISORDERED:
3505                         dprintk("%s ERROR %d, Reset session\n", __func__,
3506                                 task->tk_status);
3507                         nfs4_schedule_state_recovery(clp);
3508                         task->tk_status = 0;
3509                         return -EAGAIN;
3510 #endif /* CONFIG_NFS_V4_1 */
3511                 case -NFS4ERR_DELAY:
3512                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3513                 case -NFS4ERR_GRACE:
3514                 case -EKEYEXPIRED:
3515                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3516                         task->tk_status = 0;
3517                         return -EAGAIN;
3518                 case -NFS4ERR_OLD_STATEID:
3519                         task->tk_status = 0;
3520                         return -EAGAIN;
3521         }
3522         task->tk_status = nfs4_map_errors(task->tk_status);
3523         return 0;
3524 do_state_recovery:
3525         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3526         nfs4_schedule_state_recovery(clp);
3527         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3528                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3529         task->tk_status = 0;
3530         return -EAGAIN;
3531 }
3532
3533 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3534                 unsigned short port, struct rpc_cred *cred,
3535                 struct nfs4_setclientid_res *res)
3536 {
3537         nfs4_verifier sc_verifier;
3538         struct nfs4_setclientid setclientid = {
3539                 .sc_verifier = &sc_verifier,
3540                 .sc_prog = program,
3541         };
3542         struct rpc_message msg = {
3543                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3544                 .rpc_argp = &setclientid,
3545                 .rpc_resp = res,
3546                 .rpc_cred = cred,
3547         };
3548         __be32 *p;
3549         int loop = 0;
3550         int status;
3551
3552         p = (__be32*)sc_verifier.data;
3553         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3554         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3555
3556         for(;;) {
3557                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3558                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3559                                 clp->cl_ipaddr,
3560                                 rpc_peeraddr2str(clp->cl_rpcclient,
3561                                                         RPC_DISPLAY_ADDR),
3562                                 rpc_peeraddr2str(clp->cl_rpcclient,
3563                                                         RPC_DISPLAY_PROTO),
3564                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3565                                 clp->cl_id_uniquifier);
3566                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3567                                 sizeof(setclientid.sc_netid),
3568                                 rpc_peeraddr2str(clp->cl_rpcclient,
3569                                                         RPC_DISPLAY_NETID));
3570                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3571                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3572                                 clp->cl_ipaddr, port >> 8, port & 255);
3573
3574                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3575                 if (status != -NFS4ERR_CLID_INUSE)
3576                         break;
3577                 if (signalled())
3578                         break;
3579                 if (loop++ & 1)
3580                         ssleep(clp->cl_lease_time + 1);
3581                 else
3582                         if (++clp->cl_id_uniquifier == 0)
3583                                 break;
3584         }
3585         return status;
3586 }
3587
3588 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3589                 struct nfs4_setclientid_res *arg,
3590                 struct rpc_cred *cred)
3591 {
3592         struct nfs_fsinfo fsinfo;
3593         struct rpc_message msg = {
3594                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3595                 .rpc_argp = arg,
3596                 .rpc_resp = &fsinfo,
3597                 .rpc_cred = cred,
3598         };
3599         unsigned long now;
3600         int status;
3601
3602         now = jiffies;
3603         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3604         if (status == 0) {
3605                 spin_lock(&clp->cl_lock);
3606                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3607                 clp->cl_last_renewal = now;
3608                 spin_unlock(&clp->cl_lock);
3609         }
3610         return status;
3611 }
3612
3613 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3614                 struct nfs4_setclientid_res *arg,
3615                 struct rpc_cred *cred)
3616 {
3617         long timeout = 0;
3618         int err;
3619         do {
3620                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3621                 switch (err) {
3622                         case 0:
3623                                 return err;
3624                         case -NFS4ERR_RESOURCE:
3625                                 /* The IBM lawyers misread another document! */
3626                         case -NFS4ERR_DELAY:
3627                         case -EKEYEXPIRED:
3628                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3629                 }
3630         } while (err == 0);
3631         return err;
3632 }
3633
3634 struct nfs4_delegreturndata {
3635         struct nfs4_delegreturnargs args;
3636         struct nfs4_delegreturnres res;
3637         struct nfs_fh fh;
3638         nfs4_stateid stateid;
3639         unsigned long timestamp;
3640         struct nfs_fattr fattr;
3641         int rpc_status;
3642 };
3643
3644 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3645 {
3646         struct nfs4_delegreturndata *data = calldata;
3647
3648         if (!nfs4_sequence_done(task, &data->res.seq_res))
3649                 return;
3650
3651         switch (task->tk_status) {
3652         case -NFS4ERR_STALE_STATEID:
3653         case -NFS4ERR_EXPIRED:
3654         case 0:
3655                 renew_lease(data->res.server, data->timestamp);
3656                 break;
3657         default:
3658                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3659                                 -EAGAIN) {
3660                         nfs_restart_rpc(task, data->res.server->nfs_client);
3661                         return;
3662                 }
3663         }
3664         data->rpc_status = task->tk_status;
3665 }
3666
3667 static void nfs4_delegreturn_release(void *calldata)
3668 {
3669         kfree(calldata);
3670 }
3671
3672 #if defined(CONFIG_NFS_V4_1)
3673 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3674 {
3675         struct nfs4_delegreturndata *d_data;
3676
3677         d_data = (struct nfs4_delegreturndata *)data;
3678
3679         if (nfs4_setup_sequence(d_data->res.server,
3680                                 &d_data->args.seq_args,
3681                                 &d_data->res.seq_res, 1, task))
3682                 return;
3683         rpc_call_start(task);
3684 }
3685 #endif /* CONFIG_NFS_V4_1 */
3686
3687 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3688 #if defined(CONFIG_NFS_V4_1)
3689         .rpc_call_prepare = nfs4_delegreturn_prepare,
3690 #endif /* CONFIG_NFS_V4_1 */
3691         .rpc_call_done = nfs4_delegreturn_done,
3692         .rpc_release = nfs4_delegreturn_release,
3693 };
3694
3695 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3696 {
3697         struct nfs4_delegreturndata *data;
3698         struct nfs_server *server = NFS_SERVER(inode);
3699         struct rpc_task *task;
3700         struct rpc_message msg = {
3701                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3702                 .rpc_cred = cred,
3703         };
3704         struct rpc_task_setup task_setup_data = {
3705                 .rpc_client = server->client,
3706                 .rpc_message = &msg,
3707                 .callback_ops = &nfs4_delegreturn_ops,
3708                 .flags = RPC_TASK_ASYNC,
3709         };
3710         int status = 0;
3711
3712         data = kzalloc(sizeof(*data), GFP_NOFS);
3713         if (data == NULL)
3714                 return -ENOMEM;
3715         data->args.fhandle = &data->fh;
3716         data->args.stateid = &data->stateid;
3717         data->args.bitmask = server->attr_bitmask;
3718         nfs_copy_fh(&data->fh, NFS_FH(inode));
3719         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3720         data->res.fattr = &data->fattr;
3721         data->res.server = server;
3722         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3723         nfs_fattr_init(data->res.fattr);
3724         data->timestamp = jiffies;
3725         data->rpc_status = 0;
3726
3727         task_setup_data.callback_data = data;
3728         msg.rpc_argp = &data->args,
3729         msg.rpc_resp = &data->res,
3730         task = rpc_run_task(&task_setup_data);
3731         if (IS_ERR(task))
3732                 return PTR_ERR(task);
3733         if (!issync)
3734                 goto out;
3735         status = nfs4_wait_for_completion_rpc_task(task);
3736         if (status != 0)
3737                 goto out;
3738         status = data->rpc_status;
3739         if (status != 0)
3740                 goto out;
3741         nfs_refresh_inode(inode, &data->fattr);
3742 out:
3743         rpc_put_task(task);
3744         return status;
3745 }
3746
3747 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3748 {
3749         struct nfs_server *server = NFS_SERVER(inode);
3750         struct nfs4_exception exception = { };
3751         int err;
3752         do {
3753                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3754                 switch (err) {
3755                         case -NFS4ERR_STALE_STATEID:
3756                         case -NFS4ERR_EXPIRED:
3757                         case 0:
3758                                 return 0;
3759                 }
3760                 err = nfs4_handle_exception(server, err, &exception);
3761         } while (exception.retry);
3762         return err;
3763 }
3764
3765 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3766 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3767
3768 /*
3769  * sleep, with exponential backoff, and retry the LOCK operation.
3770  */
3771 static unsigned long
3772 nfs4_set_lock_task_retry(unsigned long timeout)
3773 {
3774         schedule_timeout_killable(timeout);
3775         timeout <<= 1;
3776         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3777                 return NFS4_LOCK_MAXTIMEOUT;
3778         return timeout;
3779 }
3780
3781 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3782 {
3783         struct inode *inode = state->inode;
3784         struct nfs_server *server = NFS_SERVER(inode);
3785         struct nfs_client *clp = server->nfs_client;
3786         struct nfs_lockt_args arg = {
3787                 .fh = NFS_FH(inode),
3788                 .fl = request,
3789         };
3790         struct nfs_lockt_res res = {
3791                 .denied = request,
3792         };
3793         struct rpc_message msg = {
3794                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3795                 .rpc_argp       = &arg,
3796                 .rpc_resp       = &res,
3797                 .rpc_cred       = state->owner->so_cred,
3798         };
3799         struct nfs4_lock_state *lsp;
3800         int status;
3801
3802         arg.lock_owner.clientid = clp->cl_clientid;
3803         status = nfs4_set_lock_state(state, request);
3804         if (status != 0)
3805                 goto out;
3806         lsp = request->fl_u.nfs4_fl.owner;
3807         arg.lock_owner.id = lsp->ls_id.id;
3808         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3809         switch (status) {
3810                 case 0:
3811                         request->fl_type = F_UNLCK;
3812                         break;
3813                 case -NFS4ERR_DENIED:
3814                         status = 0;
3815         }
3816         request->fl_ops->fl_release_private(request);
3817 out:
3818         return status;
3819 }
3820
3821 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3822 {
3823         struct nfs4_exception exception = { };
3824         int err;
3825
3826         do {
3827                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3828                                 _nfs4_proc_getlk(state, cmd, request),
3829                                 &exception);
3830         } while (exception.retry);
3831         return err;
3832 }
3833
3834 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3835 {
3836         int res = 0;
3837         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3838                 case FL_POSIX:
3839                         res = posix_lock_file_wait(file, fl);
3840                         break;
3841                 case FL_FLOCK:
3842                         res = flock_lock_file_wait(file, fl);
3843                         break;
3844                 default:
3845                         BUG();
3846         }
3847         return res;
3848 }
3849
3850 struct nfs4_unlockdata {
3851         struct nfs_locku_args arg;
3852         struct nfs_locku_res res;
3853         struct nfs4_lock_state *lsp;
3854         struct nfs_open_context *ctx;
3855         struct file_lock fl;
3856         const struct nfs_server *server;
3857         unsigned long timestamp;
3858 };
3859
3860 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3861                 struct nfs_open_context *ctx,
3862                 struct nfs4_lock_state *lsp,
3863                 struct nfs_seqid *seqid)
3864 {
3865         struct nfs4_unlockdata *p;
3866         struct inode *inode = lsp->ls_state->inode;
3867
3868         p = kzalloc(sizeof(*p), GFP_NOFS);
3869         if (p == NULL)
3870                 return NULL;
3871         p->arg.fh = NFS_FH(inode);
3872         p->arg.fl = &p->fl;
3873         p->arg.seqid = seqid;
3874         p->res.seqid = seqid;
3875         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3876         p->arg.stateid = &lsp->ls_stateid;
3877         p->lsp = lsp;
3878         atomic_inc(&lsp->ls_count);
3879         /* Ensure we don't close file until we're done freeing locks! */
3880         p->ctx = get_nfs_open_context(ctx);
3881         memcpy(&p->fl, fl, sizeof(p->fl));
3882         p->server = NFS_SERVER(inode);
3883         return p;
3884 }
3885
3886 static void nfs4_locku_release_calldata(void *data)
3887 {
3888         struct nfs4_unlockdata *calldata = data;
3889         nfs_free_seqid(calldata->arg.seqid);
3890         nfs4_put_lock_state(calldata->lsp);
3891         put_nfs_open_context(calldata->ctx);
3892         kfree(calldata);
3893 }
3894
3895 static void nfs4_locku_done(struct rpc_task *task, void *data)
3896 {
3897         struct nfs4_unlockdata *calldata = data;
3898
3899         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3900                 return;
3901         switch (task->tk_status) {
3902                 case 0:
3903                         memcpy(calldata->lsp->ls_stateid.data,
3904                                         calldata->res.stateid.data,
3905                                         sizeof(calldata->lsp->ls_stateid.data));
3906                         renew_lease(calldata->server, calldata->timestamp);
3907                         break;
3908                 case -NFS4ERR_BAD_STATEID:
3909                 case -NFS4ERR_OLD_STATEID:
3910                 case -NFS4ERR_STALE_STATEID:
3911                 case -NFS4ERR_EXPIRED:
3912                         break;
3913                 default:
3914                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3915                                 nfs_restart_rpc(task,
3916                                                  calldata->server->nfs_client);
3917         }
3918 }
3919
3920 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3921 {
3922         struct nfs4_unlockdata *calldata = data;
3923
3924         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3925                 return;
3926         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3927                 /* Note: exit _without_ running nfs4_locku_done */
3928                 task->tk_action = NULL;
3929                 return;
3930         }
3931         calldata->timestamp = jiffies;
3932         if (nfs4_setup_sequence(calldata->server,
3933                                 &calldata->arg.seq_args,
3934                                 &calldata->res.seq_res, 1, task))
3935                 return;
3936         rpc_call_start(task);
3937 }
3938
3939 static const struct rpc_call_ops nfs4_locku_ops = {
3940         .rpc_call_prepare = nfs4_locku_prepare,
3941         .rpc_call_done = nfs4_locku_done,
3942         .rpc_release = nfs4_locku_release_calldata,
3943 };
3944
3945 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3946                 struct nfs_open_context *ctx,
3947                 struct nfs4_lock_state *lsp,
3948                 struct nfs_seqid *seqid)
3949 {
3950         struct nfs4_unlockdata *data;
3951         struct rpc_message msg = {
3952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3953                 .rpc_cred = ctx->cred,
3954         };
3955         struct rpc_task_setup task_setup_data = {
3956                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3957                 .rpc_message = &msg,
3958                 .callback_ops = &nfs4_locku_ops,
3959                 .workqueue = nfsiod_workqueue,
3960                 .flags = RPC_TASK_ASYNC,
3961         };
3962
3963         /* Ensure this is an unlock - when canceling a lock, the
3964          * canceled lock is passed in, and it won't be an unlock.
3965          */
3966         fl->fl_type = F_UNLCK;
3967
3968         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3969         if (data == NULL) {
3970                 nfs_free_seqid(seqid);
3971                 return ERR_PTR(-ENOMEM);
3972         }
3973
3974         msg.rpc_argp = &data->arg,
3975         msg.rpc_resp = &data->res,
3976         task_setup_data.callback_data = data;
3977         return rpc_run_task(&task_setup_data);
3978 }
3979
3980 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3981 {
3982         struct nfs_inode *nfsi = NFS_I(state->inode);
3983         struct nfs_seqid *seqid;
3984         struct nfs4_lock_state *lsp;
3985         struct rpc_task *task;
3986         int status = 0;
3987         unsigned char fl_flags = request->fl_flags;
3988
3989         status = nfs4_set_lock_state(state, request);
3990         /* Unlock _before_ we do the RPC call */
3991         request->fl_flags |= FL_EXISTS;
3992         down_read(&nfsi->rwsem);
3993         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3994                 up_read(&nfsi->rwsem);
3995                 goto out;
3996         }
3997         up_read(&nfsi->rwsem);
3998         if (status != 0)
3999                 goto out;
4000         /* Is this a delegated lock? */
4001         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4002                 goto out;
4003         lsp = request->fl_u.nfs4_fl.owner;
4004         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4005         status = -ENOMEM;
4006         if (seqid == NULL)
4007                 goto out;
4008         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4009         status = PTR_ERR(task);
4010         if (IS_ERR(task))
4011                 goto out;
4012         status = nfs4_wait_for_completion_rpc_task(task);
4013         rpc_put_task(task);
4014 out:
4015         request->fl_flags = fl_flags;
4016         return status;
4017 }
4018
4019 struct nfs4_lockdata {
4020         struct nfs_lock_args arg;
4021         struct nfs_lock_res res;
4022         struct nfs4_lock_state *lsp;
4023         struct nfs_open_context *ctx;
4024         struct file_lock fl;
4025         unsigned long timestamp;
4026         int rpc_status;
4027         int cancelled;
4028         struct nfs_server *server;
4029 };
4030
4031 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4032                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4033                 gfp_t gfp_mask)
4034 {
4035         struct nfs4_lockdata *p;
4036         struct inode *inode = lsp->ls_state->inode;
4037         struct nfs_server *server = NFS_SERVER(inode);
4038
4039         p = kzalloc(sizeof(*p), gfp_mask);
4040         if (p == NULL)
4041                 return NULL;
4042
4043         p->arg.fh = NFS_FH(inode);
4044         p->arg.fl = &p->fl;
4045         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4046         if (p->arg.open_seqid == NULL)
4047                 goto out_free;
4048         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4049         if (p->arg.lock_seqid == NULL)
4050                 goto out_free_seqid;
4051         p->arg.lock_stateid = &lsp->ls_stateid;
4052         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4053         p->arg.lock_owner.id = lsp->ls_id.id;
4054         p->res.lock_seqid = p->arg.lock_seqid;
4055         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4056         p->lsp = lsp;
4057         p->server = server;
4058         atomic_inc(&lsp->ls_count);
4059         p->ctx = get_nfs_open_context(ctx);
4060         memcpy(&p->fl, fl, sizeof(p->fl));
4061         return p;
4062 out_free_seqid:
4063         nfs_free_seqid(p->arg.open_seqid);
4064 out_free:
4065         kfree(p);
4066         return NULL;
4067 }
4068
4069 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4070 {
4071         struct nfs4_lockdata *data = calldata;
4072         struct nfs4_state *state = data->lsp->ls_state;
4073
4074         dprintk("%s: begin!\n", __func__);
4075         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4076                 return;
4077         /* Do we need to do an open_to_lock_owner? */
4078         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4079                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4080                         return;
4081                 data->arg.open_stateid = &state->stateid;
4082                 data->arg.new_lock_owner = 1;
4083                 data->res.open_seqid = data->arg.open_seqid;
4084         } else
4085                 data->arg.new_lock_owner = 0;
4086         data->timestamp = jiffies;
4087         if (nfs4_setup_sequence(data->server,
4088                                 &data->arg.seq_args,
4089                                 &data->res.seq_res, 1, task))
4090                 return;
4091         rpc_call_start(task);
4092         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4093 }
4094
4095 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4096 {
4097         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4098         nfs4_lock_prepare(task, calldata);
4099 }
4100
4101 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4102 {
4103         struct nfs4_lockdata *data = calldata;
4104
4105         dprintk("%s: begin!\n", __func__);
4106
4107         if (!nfs4_sequence_done(task, &data->res.seq_res))
4108                 return;
4109
4110         data->rpc_status = task->tk_status;
4111         if (data->arg.new_lock_owner != 0) {
4112                 if (data->rpc_status == 0)
4113                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4114                 else
4115                         goto out;
4116         }
4117         if (data->rpc_status == 0) {
4118                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4119                                         sizeof(data->lsp->ls_stateid.data));
4120                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4121                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4122         }
4123 out:
4124         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4125 }
4126
4127 static void nfs4_lock_release(void *calldata)
4128 {
4129         struct nfs4_lockdata *data = calldata;
4130
4131         dprintk("%s: begin!\n", __func__);
4132         nfs_free_seqid(data->arg.open_seqid);
4133         if (data->cancelled != 0) {
4134                 struct rpc_task *task;
4135                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4136                                 data->arg.lock_seqid);
4137                 if (!IS_ERR(task))
4138                         rpc_put_task(task);
4139                 dprintk("%s: cancelling lock!\n", __func__);
4140         } else
4141                 nfs_free_seqid(data->arg.lock_seqid);
4142         nfs4_put_lock_state(data->lsp);
4143         put_nfs_open_context(data->ctx);
4144         kfree(data);
4145         dprintk("%s: done!\n", __func__);
4146 }
4147
4148 static const struct rpc_call_ops nfs4_lock_ops = {
4149         .rpc_call_prepare = nfs4_lock_prepare,
4150         .rpc_call_done = nfs4_lock_done,
4151         .rpc_release = nfs4_lock_release,
4152 };
4153
4154 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4155         .rpc_call_prepare = nfs4_recover_lock_prepare,
4156         .rpc_call_done = nfs4_lock_done,
4157         .rpc_release = nfs4_lock_release,
4158 };
4159
4160 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4161 {
4162         struct nfs_client *clp = server->nfs_client;
4163         struct nfs4_state *state = lsp->ls_state;
4164
4165         switch (error) {
4166         case -NFS4ERR_ADMIN_REVOKED:
4167         case -NFS4ERR_BAD_STATEID:
4168         case -NFS4ERR_EXPIRED:
4169                 if (new_lock_owner != 0 ||
4170                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4171                         nfs4_state_mark_reclaim_nograce(clp, state);
4172                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4173                 break;
4174         case -NFS4ERR_STALE_STATEID:
4175                 if (new_lock_owner != 0 ||
4176                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4177                         nfs4_state_mark_reclaim_reboot(clp, state);
4178                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4179         };
4180 }
4181
4182 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4183 {
4184         struct nfs4_lockdata *data;
4185         struct rpc_task *task;
4186         struct rpc_message msg = {
4187                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4188                 .rpc_cred = state->owner->so_cred,
4189         };
4190         struct rpc_task_setup task_setup_data = {
4191                 .rpc_client = NFS_CLIENT(state->inode),
4192                 .rpc_message = &msg,
4193                 .callback_ops = &nfs4_lock_ops,
4194                 .workqueue = nfsiod_workqueue,
4195                 .flags = RPC_TASK_ASYNC,
4196         };
4197         int ret;
4198
4199         dprintk("%s: begin!\n", __func__);
4200         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4201                         fl->fl_u.nfs4_fl.owner,
4202                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4203         if (data == NULL)
4204                 return -ENOMEM;
4205         if (IS_SETLKW(cmd))
4206                 data->arg.block = 1;
4207         if (recovery_type > NFS_LOCK_NEW) {
4208                 if (recovery_type == NFS_LOCK_RECLAIM)
4209                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4210                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4211         }
4212         msg.rpc_argp = &data->arg,
4213         msg.rpc_resp = &data->res,
4214         task_setup_data.callback_data = data;
4215         task = rpc_run_task(&task_setup_data);
4216         if (IS_ERR(task))
4217                 return PTR_ERR(task);
4218         ret = nfs4_wait_for_completion_rpc_task(task);
4219         if (ret == 0) {
4220                 ret = data->rpc_status;
4221                 if (ret)
4222                         nfs4_handle_setlk_error(data->server, data->lsp,
4223                                         data->arg.new_lock_owner, ret);
4224         } else
4225                 data->cancelled = 1;
4226         rpc_put_task(task);
4227         dprintk("%s: done, ret = %d!\n", __func__, ret);
4228         return ret;
4229 }
4230
4231 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4232 {
4233         struct nfs_server *server = NFS_SERVER(state->inode);
4234         struct nfs4_exception exception = { };
4235         int err;
4236
4237         do {
4238                 /* Cache the lock if possible... */
4239                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4240                         return 0;
4241                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4242                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4243                         break;
4244                 nfs4_handle_exception(server, err, &exception);
4245         } while (exception.retry);
4246         return err;
4247 }
4248
4249 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4250 {
4251         struct nfs_server *server = NFS_SERVER(state->inode);
4252         struct nfs4_exception exception = { };
4253         int err;
4254
4255         err = nfs4_set_lock_state(state, request);
4256         if (err != 0)
4257                 return err;
4258         do {
4259                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4260                         return 0;
4261                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4262                 switch (err) {
4263                 default:
4264                         goto out;
4265                 case -NFS4ERR_GRACE:
4266                 case -NFS4ERR_DELAY:
4267                 case -EKEYEXPIRED:
4268                         nfs4_handle_exception(server, err, &exception);
4269                         err = 0;
4270                 }
4271         } while (exception.retry);
4272 out:
4273         return err;
4274 }
4275
4276 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4277 {
4278         struct nfs_inode *nfsi = NFS_I(state->inode);
4279         unsigned char fl_flags = request->fl_flags;
4280         int status = -ENOLCK;
4281
4282         if ((fl_flags & FL_POSIX) &&
4283                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4284                 goto out;
4285         /* Is this a delegated open? */
4286         status = nfs4_set_lock_state(state, request);
4287         if (status != 0)
4288                 goto out;
4289         request->fl_flags |= FL_ACCESS;
4290         status = do_vfs_lock(request->fl_file, request);
4291         if (status < 0)
4292                 goto out;
4293         down_read(&nfsi->rwsem);
4294         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4295                 /* Yes: cache locks! */
4296                 /* ...but avoid races with delegation recall... */
4297                 request->fl_flags = fl_flags & ~FL_SLEEP;
4298                 status = do_vfs_lock(request->fl_file, request);
4299                 goto out_unlock;
4300         }
4301         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4302         if (status != 0)
4303                 goto out_unlock;
4304         /* Note: we always want to sleep here! */
4305         request->fl_flags = fl_flags | FL_SLEEP;
4306         if (do_vfs_lock(request->fl_file, request) < 0)
4307                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4308 out_unlock:
4309         up_read(&nfsi->rwsem);
4310 out:
4311         request->fl_flags = fl_flags;
4312         return status;
4313 }
4314
4315 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4316 {
4317         struct nfs4_exception exception = { };
4318         int err;
4319
4320         do {
4321                 err = _nfs4_proc_setlk(state, cmd, request);
4322                 if (err == -NFS4ERR_DENIED)
4323                         err = -EAGAIN;
4324                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4325                                 err, &exception);
4326         } while (exception.retry);
4327         return err;
4328 }
4329
4330 static int
4331 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4332 {
4333         struct nfs_open_context *ctx;
4334         struct nfs4_state *state;
4335         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4336         int status;
4337
4338         /* verify open state */
4339         ctx = nfs_file_open_context(filp);
4340         state = ctx->state;
4341
4342         if (request->fl_start < 0 || request->fl_end < 0)
4343                 return -EINVAL;
4344
4345         if (IS_GETLK(cmd)) {
4346                 if (state != NULL)
4347                         return nfs4_proc_getlk(state, F_GETLK, request);
4348                 return 0;
4349         }
4350
4351         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4352                 return -EINVAL;
4353
4354         if (request->fl_type == F_UNLCK) {
4355                 if (state != NULL)
4356                         return nfs4_proc_unlck(state, cmd, request);
4357                 return 0;
4358         }
4359
4360         if (state == NULL)
4361                 return -ENOLCK;
4362         do {
4363                 status = nfs4_proc_setlk(state, cmd, request);
4364                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4365                         break;
4366                 timeout = nfs4_set_lock_task_retry(timeout);
4367                 status = -ERESTARTSYS;
4368                 if (signalled())
4369                         break;
4370         } while(status < 0);
4371         return status;
4372 }
4373
4374 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4375 {
4376         struct nfs_server *server = NFS_SERVER(state->inode);
4377         struct nfs4_exception exception = { };
4378         int err;
4379
4380         err = nfs4_set_lock_state(state, fl);
4381         if (err != 0)
4382                 goto out;
4383         do {
4384                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4385                 switch (err) {
4386                         default:
4387                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4388                                                 __func__, err);
4389                         case 0:
4390                         case -ESTALE:
4391                                 goto out;
4392                         case -NFS4ERR_EXPIRED:
4393                         case -NFS4ERR_STALE_CLIENTID:
4394                         case -NFS4ERR_STALE_STATEID:
4395                         case -NFS4ERR_BADSESSION:
4396                         case -NFS4ERR_BADSLOT:
4397                         case -NFS4ERR_BAD_HIGH_SLOT:
4398                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4399                         case -NFS4ERR_DEADSESSION:
4400                                 nfs4_schedule_state_recovery(server->nfs_client);
4401                                 goto out;
4402                         case -ERESTARTSYS:
4403                                 /*
4404                                  * The show must go on: exit, but mark the
4405                                  * stateid as needing recovery.
4406                                  */
4407                         case -NFS4ERR_ADMIN_REVOKED:
4408                         case -NFS4ERR_BAD_STATEID:
4409                         case -NFS4ERR_OPENMODE:
4410                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4411                                 err = 0;
4412                                 goto out;
4413                         case -ENOMEM:
4414                         case -NFS4ERR_DENIED:
4415                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4416                                 err = 0;
4417                                 goto out;
4418                         case -NFS4ERR_DELAY:
4419                         case -EKEYEXPIRED:
4420                                 break;
4421                 }
4422                 err = nfs4_handle_exception(server, err, &exception);
4423         } while (exception.retry);
4424 out:
4425         return err;
4426 }
4427
4428 static void nfs4_release_lockowner_release(void *calldata)
4429 {
4430         kfree(calldata);
4431 }
4432
4433 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4434         .rpc_release = nfs4_release_lockowner_release,
4435 };
4436
4437 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4438 {
4439         struct nfs_server *server = lsp->ls_state->owner->so_server;
4440         struct nfs_release_lockowner_args *args;
4441         struct rpc_message msg = {
4442                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4443         };
4444
4445         if (server->nfs_client->cl_mvops->minor_version != 0)
4446                 return;
4447         args = kmalloc(sizeof(*args), GFP_NOFS);
4448         if (!args)
4449                 return;
4450         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4451         args->lock_owner.id = lsp->ls_id.id;
4452         msg.rpc_argp = args;
4453         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4454 }
4455
4456 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4457
4458 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4459                 size_t buflen, int flags)
4460 {
4461         struct inode *inode = dentry->d_inode;
4462
4463         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4464                 return -EOPNOTSUPP;
4465
4466         return nfs4_proc_set_acl(inode, buf, buflen);
4467 }
4468
4469 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4470  * and that's what we'll do for e.g. user attributes that haven't been set.
4471  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4472  * attributes in kernel-managed attribute namespaces. */
4473 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4474                 size_t buflen)
4475 {
4476         struct inode *inode = dentry->d_inode;
4477
4478         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4479                 return -EOPNOTSUPP;
4480
4481         return nfs4_proc_get_acl(inode, buf, buflen);
4482 }
4483
4484 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4485 {
4486         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4487
4488         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4489                 return 0;
4490         if (buf && buflen < len)
4491                 return -ERANGE;
4492         if (buf)
4493                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4494         return len;
4495 }
4496
4497 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4498 {
4499         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4500                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4501                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4502                 return;
4503
4504         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4505                 NFS_ATTR_FATTR_NLINK;
4506         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4507         fattr->nlink = 2;
4508 }
4509
4510 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4511                 struct nfs4_fs_locations *fs_locations, struct page *page)
4512 {
4513         struct nfs_server *server = NFS_SERVER(dir);
4514         u32 bitmask[2] = {
4515                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4516                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4517         };
4518         struct nfs4_fs_locations_arg args = {
4519                 .dir_fh = NFS_FH(dir),
4520                 .name = name,
4521                 .page = page,
4522                 .bitmask = bitmask,
4523         };
4524         struct nfs4_fs_locations_res res = {
4525                 .fs_locations = fs_locations,
4526         };
4527         struct rpc_message msg = {
4528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4529                 .rpc_argp = &args,
4530                 .rpc_resp = &res,
4531         };
4532         int status;
4533
4534         dprintk("%s: start\n", __func__);
4535         nfs_fattr_init(&fs_locations->fattr);
4536         fs_locations->server = server;
4537         fs_locations->nlocations = 0;
4538         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4539         nfs_fixup_referral_attributes(&fs_locations->fattr);
4540         dprintk("%s: returned status = %d\n", __func__, status);
4541         return status;
4542 }
4543
4544 #ifdef CONFIG_NFS_V4_1
4545 /*
4546  * nfs4_proc_exchange_id()
4547  *
4548  * Since the clientid has expired, all compounds using sessions
4549  * associated with the stale clientid will be returning
4550  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4551  * be in some phase of session reset.
4552  */
4553 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4554 {
4555         nfs4_verifier verifier;
4556         struct nfs41_exchange_id_args args = {
4557                 .client = clp,
4558                 .flags = clp->cl_exchange_flags,
4559         };
4560         struct nfs41_exchange_id_res res = {
4561                 .client = clp,
4562         };
4563         int status;
4564         struct rpc_message msg = {
4565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4566                 .rpc_argp = &args,
4567                 .rpc_resp = &res,
4568                 .rpc_cred = cred,
4569         };
4570         __be32 *p;
4571
4572         dprintk("--> %s\n", __func__);
4573         BUG_ON(clp == NULL);
4574
4575         /* Remove server-only flags */
4576         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4577
4578         p = (u32 *)verifier.data;
4579         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4580         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4581         args.verifier = &verifier;
4582
4583         while (1) {
4584                 args.id_len = scnprintf(args.id, sizeof(args.id),
4585                                         "%s/%s %u",
4586                                         clp->cl_ipaddr,
4587                                         rpc_peeraddr2str(clp->cl_rpcclient,
4588                                                          RPC_DISPLAY_ADDR),
4589                                         clp->cl_id_uniquifier);
4590
4591                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4592
4593                 if (status != -NFS4ERR_CLID_INUSE)
4594                         break;
4595
4596                 if (signalled())
4597                         break;
4598
4599                 if (++clp->cl_id_uniquifier == 0)
4600                         break;
4601         }
4602
4603         dprintk("<-- %s status= %d\n", __func__, status);
4604         return status;
4605 }
4606
4607 struct nfs4_get_lease_time_data {
4608         struct nfs4_get_lease_time_args *args;
4609         struct nfs4_get_lease_time_res *res;
4610         struct nfs_client *clp;
4611 };
4612
4613 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4614                                         void *calldata)
4615 {
4616         int ret;
4617         struct nfs4_get_lease_time_data *data =
4618                         (struct nfs4_get_lease_time_data *)calldata;
4619
4620         dprintk("--> %s\n", __func__);
4621         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4622         /* just setup sequence, do not trigger session recovery
4623            since we're invoked within one */
4624         ret = nfs41_setup_sequence(data->clp->cl_session,
4625                                    &data->args->la_seq_args,
4626                                    &data->res->lr_seq_res, 0, task);
4627
4628         BUG_ON(ret == -EAGAIN);
4629         rpc_call_start(task);
4630         dprintk("<-- %s\n", __func__);
4631 }
4632
4633 /*
4634  * Called from nfs4_state_manager thread for session setup, so don't recover
4635  * from sequence operation or clientid errors.
4636  */
4637 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4638 {
4639         struct nfs4_get_lease_time_data *data =
4640                         (struct nfs4_get_lease_time_data *)calldata;
4641
4642         dprintk("--> %s\n", __func__);
4643         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4644                 return;
4645         switch (task->tk_status) {
4646         case -NFS4ERR_DELAY:
4647         case -NFS4ERR_GRACE:
4648         case -EKEYEXPIRED:
4649                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4650                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4651                 task->tk_status = 0;
4652                 nfs_restart_rpc(task, data->clp);
4653                 return;
4654         }
4655         dprintk("<-- %s\n", __func__);
4656 }
4657
4658 struct rpc_call_ops nfs4_get_lease_time_ops = {
4659         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4660         .rpc_call_done = nfs4_get_lease_time_done,
4661 };
4662
4663 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4664 {
4665         struct rpc_task *task;
4666         struct nfs4_get_lease_time_args args;
4667         struct nfs4_get_lease_time_res res = {
4668                 .lr_fsinfo = fsinfo,
4669         };
4670         struct nfs4_get_lease_time_data data = {
4671                 .args = &args,
4672                 .res = &res,
4673                 .clp = clp,
4674         };
4675         struct rpc_message msg = {
4676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4677                 .rpc_argp = &args,
4678                 .rpc_resp = &res,
4679         };
4680         struct rpc_task_setup task_setup = {
4681                 .rpc_client = clp->cl_rpcclient,
4682                 .rpc_message = &msg,
4683                 .callback_ops = &nfs4_get_lease_time_ops,
4684                 .callback_data = &data
4685         };
4686         int status;
4687
4688         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4689         dprintk("--> %s\n", __func__);
4690         task = rpc_run_task(&task_setup);
4691
4692         if (IS_ERR(task))
4693                 status = PTR_ERR(task);
4694         else {
4695                 status = task->tk_status;
4696                 rpc_put_task(task);
4697         }
4698         dprintk("<-- %s return %d\n", __func__, status);
4699
4700         return status;
4701 }
4702
4703 /*
4704  * Reset a slot table
4705  */
4706 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4707                                  int ivalue)
4708 {
4709         struct nfs4_slot *new = NULL;
4710         int i;
4711         int ret = 0;
4712
4713         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4714                 max_reqs, tbl->max_slots);
4715
4716         /* Does the newly negotiated max_reqs match the existing slot table? */
4717         if (max_reqs != tbl->max_slots) {
4718                 ret = -ENOMEM;
4719                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4720                               GFP_NOFS);
4721                 if (!new)
4722                         goto out;
4723                 ret = 0;
4724                 kfree(tbl->slots);
4725         }
4726         spin_lock(&tbl->slot_tbl_lock);
4727         if (new) {
4728                 tbl->slots = new;
4729                 tbl->max_slots = max_reqs;
4730         }
4731         for (i = 0; i < tbl->max_slots; ++i)
4732                 tbl->slots[i].seq_nr = ivalue;
4733         spin_unlock(&tbl->slot_tbl_lock);
4734         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4735                 tbl, tbl->slots, tbl->max_slots);
4736 out:
4737         dprintk("<-- %s: return %d\n", __func__, ret);
4738         return ret;
4739 }
4740
4741 /*
4742  * Reset the forechannel and backchannel slot tables
4743  */
4744 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4745 {
4746         int status;
4747
4748         status = nfs4_reset_slot_table(&session->fc_slot_table,
4749                         session->fc_attrs.max_reqs, 1);
4750         if (status)
4751                 return status;
4752
4753         status = nfs4_reset_slot_table(&session->bc_slot_table,
4754                         session->bc_attrs.max_reqs, 0);
4755         return status;
4756 }
4757
4758 /* Destroy the slot table */
4759 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4760 {
4761         if (session->fc_slot_table.slots != NULL) {
4762                 kfree(session->fc_slot_table.slots);
4763                 session->fc_slot_table.slots = NULL;
4764         }
4765         if (session->bc_slot_table.slots != NULL) {
4766                 kfree(session->bc_slot_table.slots);
4767                 session->bc_slot_table.slots = NULL;
4768         }
4769         return;
4770 }
4771
4772 /*
4773  * Initialize slot table
4774  */
4775 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4776                 int max_slots, int ivalue)
4777 {
4778         struct nfs4_slot *slot;
4779         int ret = -ENOMEM;
4780
4781         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4782
4783         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4784
4785         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4786         if (!slot)
4787                 goto out;
4788         ret = 0;
4789
4790         spin_lock(&tbl->slot_tbl_lock);
4791         tbl->max_slots = max_slots;
4792         tbl->slots = slot;
4793         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4794         spin_unlock(&tbl->slot_tbl_lock);
4795         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4796                 tbl, tbl->slots, tbl->max_slots);
4797 out:
4798         dprintk("<-- %s: return %d\n", __func__, ret);
4799         return ret;
4800 }
4801
4802 /*
4803  * Initialize the forechannel and backchannel tables
4804  */
4805 static int nfs4_init_slot_tables(struct nfs4_session *session)
4806 {
4807         struct nfs4_slot_table *tbl;
4808         int status = 0;
4809
4810         tbl = &session->fc_slot_table;
4811         if (tbl->slots == NULL) {
4812                 status = nfs4_init_slot_table(tbl,
4813                                 session->fc_attrs.max_reqs, 1);
4814                 if (status)
4815                         return status;
4816         }
4817
4818         tbl = &session->bc_slot_table;
4819         if (tbl->slots == NULL) {
4820                 status = nfs4_init_slot_table(tbl,
4821                                 session->bc_attrs.max_reqs, 0);
4822                 if (status)
4823                         nfs4_destroy_slot_tables(session);
4824         }
4825
4826         return status;
4827 }
4828
4829 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4830 {
4831         struct nfs4_session *session;
4832         struct nfs4_slot_table *tbl;
4833
4834         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4835         if (!session)
4836                 return NULL;
4837
4838         init_completion(&session->complete);
4839
4840         tbl = &session->fc_slot_table;
4841         tbl->highest_used_slotid = -1;
4842         spin_lock_init(&tbl->slot_tbl_lock);
4843         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4844
4845         tbl = &session->bc_slot_table;
4846         tbl->highest_used_slotid = -1;
4847         spin_lock_init(&tbl->slot_tbl_lock);
4848         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4849
4850         session->session_state = 1<<NFS4_SESSION_INITING;
4851
4852         session->clp = clp;
4853         return session;
4854 }
4855
4856 void nfs4_destroy_session(struct nfs4_session *session)
4857 {
4858         nfs4_proc_destroy_session(session);
4859         dprintk("%s Destroy backchannel for xprt %p\n",
4860                 __func__, session->clp->cl_rpcclient->cl_xprt);
4861         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4862                                 NFS41_BC_MIN_CALLBACKS);
4863         nfs4_destroy_slot_tables(session);
4864         kfree(session);
4865 }
4866
4867 /*
4868  * Initialize the values to be used by the client in CREATE_SESSION
4869  * If nfs4_init_session set the fore channel request and response sizes,
4870  * use them.
4871  *
4872  * Set the back channel max_resp_sz_cached to zero to force the client to
4873  * always set csa_cachethis to FALSE because the current implementation
4874  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4875  */
4876 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4877 {
4878         struct nfs4_session *session = args->client->cl_session;
4879         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4880                      mxresp_sz = session->fc_attrs.max_resp_sz;
4881
4882         if (mxrqst_sz == 0)
4883                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4884         if (mxresp_sz == 0)
4885                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4886         /* Fore channel attributes */
4887         args->fc_attrs.headerpadsz = 0;
4888         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4889         args->fc_attrs.max_resp_sz = mxresp_sz;
4890         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4891         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4892
4893         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4894                 "max_ops=%u max_reqs=%u\n",
4895                 __func__,
4896                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4897                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4898
4899         /* Back channel attributes */
4900         args->bc_attrs.headerpadsz = 0;
4901         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4902         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4903         args->bc_attrs.max_resp_sz_cached = 0;
4904         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4905         args->bc_attrs.max_reqs = 1;
4906
4907         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4908                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4909                 __func__,
4910                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4911                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4912                 args->bc_attrs.max_reqs);
4913 }
4914
4915 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4916 {
4917         if (rcvd <= sent)
4918                 return 0;
4919         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4920                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4921         return -EINVAL;
4922 }
4923
4924 #define _verify_fore_channel_attr(_name_) \
4925         _verify_channel_attr("fore", #_name_, \
4926                              args->fc_attrs._name_, \
4927                              session->fc_attrs._name_)
4928
4929 #define _verify_back_channel_attr(_name_) \
4930         _verify_channel_attr("back", #_name_, \
4931                              args->bc_attrs._name_, \
4932                              session->bc_attrs._name_)
4933
4934 /*
4935  * The server is not allowed to increase the fore channel header pad size,
4936  * maximum response size, or maximum number of operations.
4937  *
4938  * The back channel attributes are only negotiatied down: We send what the
4939  * (back channel) server insists upon.
4940  */
4941 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4942                                      struct nfs4_session *session)
4943 {
4944         int ret = 0;
4945
4946         ret |= _verify_fore_channel_attr(headerpadsz);
4947         ret |= _verify_fore_channel_attr(max_resp_sz);
4948         ret |= _verify_fore_channel_attr(max_ops);
4949
4950         ret |= _verify_back_channel_attr(headerpadsz);
4951         ret |= _verify_back_channel_attr(max_rqst_sz);
4952         ret |= _verify_back_channel_attr(max_resp_sz);
4953         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4954         ret |= _verify_back_channel_attr(max_ops);
4955         ret |= _verify_back_channel_attr(max_reqs);
4956
4957         return ret;
4958 }
4959
4960 static int _nfs4_proc_create_session(struct nfs_client *clp)
4961 {
4962         struct nfs4_session *session = clp->cl_session;
4963         struct nfs41_create_session_args args = {
4964                 .client = clp,
4965                 .cb_program = NFS4_CALLBACK,
4966         };
4967         struct nfs41_create_session_res res = {
4968                 .client = clp,
4969         };
4970         struct rpc_message msg = {
4971                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4972                 .rpc_argp = &args,
4973                 .rpc_resp = &res,
4974         };
4975         int status;
4976
4977         nfs4_init_channel_attrs(&args);
4978         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4979
4980         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4981
4982         if (!status)
4983                 /* Verify the session's negotiated channel_attrs values */
4984                 status = nfs4_verify_channel_attrs(&args, session);
4985         if (!status) {
4986                 /* Increment the clientid slot sequence id */
4987                 clp->cl_seqid++;
4988         }
4989
4990         return status;
4991 }
4992
4993 /*
4994  * Issues a CREATE_SESSION operation to the server.
4995  * It is the responsibility of the caller to verify the session is
4996  * expired before calling this routine.
4997  */
4998 int nfs4_proc_create_session(struct nfs_client *clp)
4999 {
5000         int status;
5001         unsigned *ptr;
5002         struct nfs4_session *session = clp->cl_session;
5003
5004         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5005
5006         status = _nfs4_proc_create_session(clp);
5007         if (status)
5008                 goto out;
5009
5010         /* Init and reset the fore channel */
5011         status = nfs4_init_slot_tables(session);
5012         dprintk("slot table initialization returned %d\n", status);
5013         if (status)
5014                 goto out;
5015         status = nfs4_reset_slot_tables(session);
5016         dprintk("slot table reset returned %d\n", status);
5017         if (status)
5018                 goto out;
5019
5020         ptr = (unsigned *)&session->sess_id.data[0];
5021         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5022                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5023 out:
5024         dprintk("<-- %s\n", __func__);
5025         return status;
5026 }
5027
5028 /*
5029  * Issue the over-the-wire RPC DESTROY_SESSION.
5030  * The caller must serialize access to this routine.
5031  */
5032 int nfs4_proc_destroy_session(struct nfs4_session *session)
5033 {
5034         int status = 0;
5035         struct rpc_message msg;
5036
5037         dprintk("--> nfs4_proc_destroy_session\n");
5038
5039         /* session is still being setup */
5040         if (session->clp->cl_cons_state != NFS_CS_READY)
5041                 return status;
5042
5043         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5044         msg.rpc_argp = session;
5045         msg.rpc_resp = NULL;
5046         msg.rpc_cred = NULL;
5047         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5048
5049         if (status)
5050                 printk(KERN_WARNING
5051                         "Got error %d from the server on DESTROY_SESSION. "
5052                         "Session has been destroyed regardless...\n", status);
5053
5054         dprintk("<-- nfs4_proc_destroy_session\n");
5055         return status;
5056 }
5057
5058 int nfs4_init_session(struct nfs_server *server)
5059 {
5060         struct nfs_client *clp = server->nfs_client;
5061         struct nfs4_session *session;
5062         unsigned int rsize, wsize;
5063         int ret;
5064
5065         if (!nfs4_has_session(clp))
5066                 return 0;
5067
5068         session = clp->cl_session;
5069         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5070                 return 0;
5071
5072         rsize = server->rsize;
5073         if (rsize == 0)
5074                 rsize = NFS_MAX_FILE_IO_SIZE;
5075         wsize = server->wsize;
5076         if (wsize == 0)
5077                 wsize = NFS_MAX_FILE_IO_SIZE;
5078
5079         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5080         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5081
5082         ret = nfs4_recover_expired_lease(server);
5083         if (!ret)
5084                 ret = nfs4_check_client_ready(clp);
5085         return ret;
5086 }
5087
5088 /*
5089  * Renew the cl_session lease.
5090  */
5091 struct nfs4_sequence_data {
5092         struct nfs_client *clp;
5093         struct nfs4_sequence_args args;
5094         struct nfs4_sequence_res res;
5095 };
5096
5097 static void nfs41_sequence_release(void *data)
5098 {
5099         struct nfs4_sequence_data *calldata = data;
5100         struct nfs_client *clp = calldata->clp;
5101
5102         if (atomic_read(&clp->cl_count) > 1)
5103                 nfs4_schedule_state_renewal(clp);
5104         nfs_put_client(clp);
5105         kfree(calldata);
5106 }
5107
5108 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5109 {
5110         switch(task->tk_status) {
5111         case -NFS4ERR_DELAY:
5112         case -EKEYEXPIRED:
5113                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5114                 return -EAGAIN;
5115         default:
5116                 nfs4_schedule_state_recovery(clp);
5117         }
5118         return 0;
5119 }
5120
5121 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5122 {
5123         struct nfs4_sequence_data *calldata = data;
5124         struct nfs_client *clp = calldata->clp;
5125
5126         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5127                 return;
5128
5129         if (task->tk_status < 0) {
5130                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5131                 if (atomic_read(&clp->cl_count) == 1)
5132                         goto out;
5133
5134                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5135                         rpc_restart_call_prepare(task);
5136                         return;
5137                 }
5138         }
5139         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5140 out:
5141         dprintk("<-- %s\n", __func__);
5142 }
5143
5144 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5145 {
5146         struct nfs4_sequence_data *calldata = data;
5147         struct nfs_client *clp = calldata->clp;
5148         struct nfs4_sequence_args *args;
5149         struct nfs4_sequence_res *res;
5150
5151         args = task->tk_msg.rpc_argp;
5152         res = task->tk_msg.rpc_resp;
5153
5154         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5155                 return;
5156         rpc_call_start(task);
5157 }
5158
5159 static const struct rpc_call_ops nfs41_sequence_ops = {
5160         .rpc_call_done = nfs41_sequence_call_done,
5161         .rpc_call_prepare = nfs41_sequence_prepare,
5162         .rpc_release = nfs41_sequence_release,
5163 };
5164
5165 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5166 {
5167         struct nfs4_sequence_data *calldata;
5168         struct rpc_message msg = {
5169                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5170                 .rpc_cred = cred,
5171         };
5172         struct rpc_task_setup task_setup_data = {
5173                 .rpc_client = clp->cl_rpcclient,
5174                 .rpc_message = &msg,
5175                 .callback_ops = &nfs41_sequence_ops,
5176                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5177         };
5178
5179         if (!atomic_inc_not_zero(&clp->cl_count))
5180                 return ERR_PTR(-EIO);
5181         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5182         if (calldata == NULL) {
5183                 nfs_put_client(clp);
5184                 return ERR_PTR(-ENOMEM);
5185         }
5186         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5187         msg.rpc_argp = &calldata->args;
5188         msg.rpc_resp = &calldata->res;
5189         calldata->clp = clp;
5190         task_setup_data.callback_data = calldata;
5191
5192         return rpc_run_task(&task_setup_data);
5193 }
5194
5195 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5196 {
5197         struct rpc_task *task;
5198         int ret = 0;
5199
5200         task = _nfs41_proc_sequence(clp, cred);
5201         if (IS_ERR(task))
5202                 ret = PTR_ERR(task);
5203         else
5204                 rpc_put_task(task);
5205         dprintk("<-- %s status=%d\n", __func__, ret);
5206         return ret;
5207 }
5208
5209 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5210 {
5211         struct rpc_task *task;
5212         int ret;
5213
5214         task = _nfs41_proc_sequence(clp, cred);
5215         if (IS_ERR(task)) {
5216                 ret = PTR_ERR(task);
5217                 goto out;
5218         }
5219         ret = rpc_wait_for_completion_task(task);
5220         if (!ret)
5221                 ret = task->tk_status;
5222         rpc_put_task(task);
5223 out:
5224         dprintk("<-- %s status=%d\n", __func__, ret);
5225         return ret;
5226 }
5227
5228 struct nfs4_reclaim_complete_data {
5229         struct nfs_client *clp;
5230         struct nfs41_reclaim_complete_args arg;
5231         struct nfs41_reclaim_complete_res res;
5232 };
5233
5234 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5235 {
5236         struct nfs4_reclaim_complete_data *calldata = data;
5237
5238         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5239         if (nfs41_setup_sequence(calldata->clp->cl_session,
5240                                 &calldata->arg.seq_args,
5241                                 &calldata->res.seq_res, 0, task))
5242                 return;
5243
5244         rpc_call_start(task);
5245 }
5246
5247 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5248 {
5249         switch(task->tk_status) {
5250         case 0:
5251         case -NFS4ERR_COMPLETE_ALREADY:
5252         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5253                 break;
5254         case -NFS4ERR_DELAY:
5255         case -EKEYEXPIRED:
5256                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5257                 return -EAGAIN;
5258         default:
5259                 nfs4_schedule_state_recovery(clp);
5260         }
5261         return 0;
5262 }
5263
5264 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5265 {
5266         struct nfs4_reclaim_complete_data *calldata = data;
5267         struct nfs_client *clp = calldata->clp;
5268         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5269
5270         dprintk("--> %s\n", __func__);
5271         if (!nfs41_sequence_done(task, res))
5272                 return;
5273
5274         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5275                 rpc_restart_call_prepare(task);
5276                 return;
5277         }
5278         dprintk("<-- %s\n", __func__);
5279 }
5280
5281 static void nfs4_free_reclaim_complete_data(void *data)
5282 {
5283         struct nfs4_reclaim_complete_data *calldata = data;
5284
5285         kfree(calldata);
5286 }
5287
5288 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5289         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5290         .rpc_call_done = nfs4_reclaim_complete_done,
5291         .rpc_release = nfs4_free_reclaim_complete_data,
5292 };
5293
5294 /*
5295  * Issue a global reclaim complete.
5296  */
5297 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5298 {
5299         struct nfs4_reclaim_complete_data *calldata;
5300         struct rpc_task *task;
5301         struct rpc_message msg = {
5302                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5303         };
5304         struct rpc_task_setup task_setup_data = {
5305                 .rpc_client = clp->cl_rpcclient,
5306                 .rpc_message = &msg,
5307                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5308                 .flags = RPC_TASK_ASYNC,
5309         };
5310         int status = -ENOMEM;
5311
5312         dprintk("--> %s\n", __func__);
5313         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5314         if (calldata == NULL)
5315                 goto out;
5316         calldata->clp = clp;
5317         calldata->arg.one_fs = 0;
5318         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5319
5320         msg.rpc_argp = &calldata->arg;
5321         msg.rpc_resp = &calldata->res;
5322         task_setup_data.callback_data = calldata;
5323         task = rpc_run_task(&task_setup_data);
5324         if (IS_ERR(task)) {
5325                 status = PTR_ERR(task);
5326                 goto out;
5327         }
5328         rpc_put_task(task);
5329         return 0;
5330 out:
5331         dprintk("<-- %s status=%d\n", __func__, status);
5332         return status;
5333 }
5334 #endif /* CONFIG_NFS_V4_1 */
5335
5336 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5337         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5338         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5339         .recover_open   = nfs4_open_reclaim,
5340         .recover_lock   = nfs4_lock_reclaim,
5341         .establish_clid = nfs4_init_clientid,
5342         .get_clid_cred  = nfs4_get_setclientid_cred,
5343 };
5344
5345 #if defined(CONFIG_NFS_V4_1)
5346 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5347         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5348         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5349         .recover_open   = nfs4_open_reclaim,
5350         .recover_lock   = nfs4_lock_reclaim,
5351         .establish_clid = nfs41_init_clientid,
5352         .get_clid_cred  = nfs4_get_exchange_id_cred,
5353         .reclaim_complete = nfs41_proc_reclaim_complete,
5354 };
5355 #endif /* CONFIG_NFS_V4_1 */
5356
5357 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5358         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5359         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5360         .recover_open   = nfs4_open_expired,
5361         .recover_lock   = nfs4_lock_expired,
5362         .establish_clid = nfs4_init_clientid,
5363         .get_clid_cred  = nfs4_get_setclientid_cred,
5364 };
5365
5366 #if defined(CONFIG_NFS_V4_1)
5367 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5368         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5369         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5370         .recover_open   = nfs4_open_expired,
5371         .recover_lock   = nfs4_lock_expired,
5372         .establish_clid = nfs41_init_clientid,
5373         .get_clid_cred  = nfs4_get_exchange_id_cred,
5374 };
5375 #endif /* CONFIG_NFS_V4_1 */
5376
5377 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5378         .sched_state_renewal = nfs4_proc_async_renew,
5379         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5380         .renew_lease = nfs4_proc_renew,
5381 };
5382
5383 #if defined(CONFIG_NFS_V4_1)
5384 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5385         .sched_state_renewal = nfs41_proc_async_sequence,
5386         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5387         .renew_lease = nfs4_proc_sequence,
5388 };
5389 #endif
5390
5391 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5392         .minor_version = 0,
5393         .call_sync = _nfs4_call_sync,
5394         .validate_stateid = nfs4_validate_delegation_stateid,
5395         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5396         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5397         .state_renewal_ops = &nfs40_state_renewal_ops,
5398 };
5399
5400 #if defined(CONFIG_NFS_V4_1)
5401 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5402         .minor_version = 1,
5403         .call_sync = _nfs4_call_sync_session,
5404         .validate_stateid = nfs41_validate_delegation_stateid,
5405         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5406         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5407         .state_renewal_ops = &nfs41_state_renewal_ops,
5408 };
5409 #endif
5410
5411 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5412         [0] = &nfs_v4_0_minor_ops,
5413 #if defined(CONFIG_NFS_V4_1)
5414         [1] = &nfs_v4_1_minor_ops,
5415 #endif
5416 };
5417
5418 static const struct inode_operations nfs4_file_inode_operations = {
5419         .permission     = nfs_permission,
5420         .getattr        = nfs_getattr,
5421         .setattr        = nfs_setattr,
5422         .getxattr       = nfs4_getxattr,
5423         .setxattr       = nfs4_setxattr,
5424         .listxattr      = nfs4_listxattr,
5425 };
5426
5427 const struct nfs_rpc_ops nfs_v4_clientops = {
5428         .version        = 4,                    /* protocol version */
5429         .dentry_ops     = &nfs4_dentry_operations,
5430         .dir_inode_ops  = &nfs4_dir_inode_operations,
5431         .file_inode_ops = &nfs4_file_inode_operations,
5432         .getroot        = nfs4_proc_get_root,
5433         .getattr        = nfs4_proc_getattr,
5434         .setattr        = nfs4_proc_setattr,
5435         .lookupfh       = nfs4_proc_lookupfh,
5436         .lookup         = nfs4_proc_lookup,
5437         .access         = nfs4_proc_access,
5438         .readlink       = nfs4_proc_readlink,
5439         .create         = nfs4_proc_create,
5440         .remove         = nfs4_proc_remove,
5441         .unlink_setup   = nfs4_proc_unlink_setup,
5442         .unlink_done    = nfs4_proc_unlink_done,
5443         .rename         = nfs4_proc_rename,
5444         .link           = nfs4_proc_link,
5445         .symlink        = nfs4_proc_symlink,
5446         .mkdir          = nfs4_proc_mkdir,
5447         .rmdir          = nfs4_proc_remove,
5448         .readdir        = nfs4_proc_readdir,
5449         .mknod          = nfs4_proc_mknod,
5450         .statfs         = nfs4_proc_statfs,
5451         .fsinfo         = nfs4_proc_fsinfo,
5452         .pathconf       = nfs4_proc_pathconf,
5453         .set_capabilities = nfs4_server_capabilities,
5454         .decode_dirent  = nfs4_decode_dirent,
5455         .read_setup     = nfs4_proc_read_setup,
5456         .read_done      = nfs4_read_done,
5457         .write_setup    = nfs4_proc_write_setup,
5458         .write_done     = nfs4_write_done,
5459         .commit_setup   = nfs4_proc_commit_setup,
5460         .commit_done    = nfs4_commit_done,
5461         .lock           = nfs4_proc_lock,
5462         .clear_acl_cache = nfs4_zap_acl_attr,
5463         .close_context  = nfs4_close_context,
5464 };
5465
5466 /*
5467  * Local variables:
5468  *  c-basic-offset: 8
5469  * End:
5470  */