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         int open_flags = nd->intent.open.flags;
2040         fmode_t fmode = open_flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2041
2042         if (nd->flags & LOOKUP_CREATE) {
2043                 attr.ia_mode = nd->intent.open.create_mode;
2044                 attr.ia_valid = ATTR_MODE;
2045                 if (!IS_POSIXACL(dir))
2046                         attr.ia_mode &= ~current_umask();
2047         } else {
2048                 open_flags &= ~O_EXCL;
2049                 attr.ia_valid = 0;
2050                 BUG_ON(open_flags & O_CREAT);
2051         }
2052
2053         cred = rpc_lookup_cred();
2054         if (IS_ERR(cred))
2055                 return (struct dentry *)cred;
2056         parent = dentry->d_parent;
2057         /* Protect against concurrent sillydeletes */
2058         nfs_block_sillyrename(parent);
2059         state = nfs4_do_open(dir, &path, fmode, open_flags, &attr, cred);
2060         put_rpccred(cred);
2061         if (IS_ERR(state)) {
2062                 if (PTR_ERR(state) == -ENOENT) {
2063                         d_add(dentry, NULL);
2064                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2065                 }
2066                 nfs_unblock_sillyrename(parent);
2067                 return (struct dentry *)state;
2068         }
2069         res = d_add_unique(dentry, igrab(state->inode));
2070         if (res != NULL)
2071                 path.dentry = res;
2072         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2073         nfs_unblock_sillyrename(parent);
2074         nfs4_intent_set_file(nd, &path, state, fmode);
2075         return res;
2076 }
2077
2078 int
2079 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2080 {
2081         struct path path = {
2082                 .mnt = nd->path.mnt,
2083                 .dentry = dentry,
2084         };
2085         struct rpc_cred *cred;
2086         struct nfs4_state *state;
2087         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2088
2089         cred = rpc_lookup_cred();
2090         if (IS_ERR(cred))
2091                 return PTR_ERR(cred);
2092         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2093         put_rpccred(cred);
2094         if (IS_ERR(state)) {
2095                 switch (PTR_ERR(state)) {
2096                         case -EPERM:
2097                         case -EACCES:
2098                         case -EDQUOT:
2099                         case -ENOSPC:
2100                         case -EROFS:
2101                                 return PTR_ERR(state);
2102                         default:
2103                                 goto out_drop;
2104                 }
2105         }
2106         if (state->inode == dentry->d_inode) {
2107                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2108                 nfs4_intent_set_file(nd, &path, state, fmode);
2109                 return 1;
2110         }
2111         nfs4_close_sync(&path, state, fmode);
2112 out_drop:
2113         d_drop(dentry);
2114         return 0;
2115 }
2116
2117 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2118 {
2119         if (ctx->state == NULL)
2120                 return;
2121         if (is_sync)
2122                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2123         else
2124                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2125 }
2126
2127 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2128 {
2129         struct nfs4_server_caps_arg args = {
2130                 .fhandle = fhandle,
2131         };
2132         struct nfs4_server_caps_res res = {};
2133         struct rpc_message msg = {
2134                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2135                 .rpc_argp = &args,
2136                 .rpc_resp = &res,
2137         };
2138         int status;
2139
2140         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2141         if (status == 0) {
2142                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2143                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2144                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2145                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2146                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2147                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2148                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2149                         server->caps |= NFS_CAP_ACLS;
2150                 if (res.has_links != 0)
2151                         server->caps |= NFS_CAP_HARDLINKS;
2152                 if (res.has_symlinks != 0)
2153                         server->caps |= NFS_CAP_SYMLINKS;
2154                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2155                         server->caps |= NFS_CAP_FILEID;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2157                         server->caps |= NFS_CAP_MODE;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2159                         server->caps |= NFS_CAP_NLINK;
2160                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2161                         server->caps |= NFS_CAP_OWNER;
2162                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2163                         server->caps |= NFS_CAP_OWNER_GROUP;
2164                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2165                         server->caps |= NFS_CAP_ATIME;
2166                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2167                         server->caps |= NFS_CAP_CTIME;
2168                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2169                         server->caps |= NFS_CAP_MTIME;
2170
2171                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2172                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2173                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2174                 server->acl_bitmask = res.acl_bitmask;
2175         }
2176
2177         return status;
2178 }
2179
2180 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2181 {
2182         struct nfs4_exception exception = { };
2183         int err;
2184         do {
2185                 err = nfs4_handle_exception(server,
2186                                 _nfs4_server_capabilities(server, fhandle),
2187                                 &exception);
2188         } while (exception.retry);
2189         return err;
2190 }
2191
2192 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2193                 struct nfs_fsinfo *info)
2194 {
2195         struct nfs4_lookup_root_arg args = {
2196                 .bitmask = nfs4_fattr_bitmap,
2197         };
2198         struct nfs4_lookup_res res = {
2199                 .server = server,
2200                 .fattr = info->fattr,
2201                 .fh = fhandle,
2202         };
2203         struct rpc_message msg = {
2204                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2205                 .rpc_argp = &args,
2206                 .rpc_resp = &res,
2207         };
2208
2209         nfs_fattr_init(info->fattr);
2210         return nfs4_call_sync(server, &msg, &args, &res, 0);
2211 }
2212
2213 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2214                 struct nfs_fsinfo *info)
2215 {
2216         struct nfs4_exception exception = { };
2217         int err;
2218         do {
2219                 err = nfs4_handle_exception(server,
2220                                 _nfs4_lookup_root(server, fhandle, info),
2221                                 &exception);
2222         } while (exception.retry);
2223         return err;
2224 }
2225
2226 /*
2227  * get the file handle for the "/" directory on the server
2228  */
2229 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2230                               struct nfs_fsinfo *info)
2231 {
2232         int status;
2233
2234         status = nfs4_lookup_root(server, fhandle, info);
2235         if (status == 0)
2236                 status = nfs4_server_capabilities(server, fhandle);
2237         if (status == 0)
2238                 status = nfs4_do_fsinfo(server, fhandle, info);
2239         return nfs4_map_errors(status);
2240 }
2241
2242 /*
2243  * Get locations and (maybe) other attributes of a referral.
2244  * Note that we'll actually follow the referral later when
2245  * we detect fsid mismatch in inode revalidation
2246  */
2247 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2248 {
2249         int status = -ENOMEM;
2250         struct page *page = NULL;
2251         struct nfs4_fs_locations *locations = NULL;
2252
2253         page = alloc_page(GFP_KERNEL);
2254         if (page == NULL)
2255                 goto out;
2256         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2257         if (locations == NULL)
2258                 goto out;
2259
2260         status = nfs4_proc_fs_locations(dir, name, locations, page);
2261         if (status != 0)
2262                 goto out;
2263         /* Make sure server returned a different fsid for the referral */
2264         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2265                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2266                 status = -EIO;
2267                 goto out;
2268         }
2269
2270         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2271         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2272         if (!fattr->mode)
2273                 fattr->mode = S_IFDIR;
2274         memset(fhandle, 0, sizeof(struct nfs_fh));
2275 out:
2276         if (page)
2277                 __free_page(page);
2278         kfree(locations);
2279         return status;
2280 }
2281
2282 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2283 {
2284         struct nfs4_getattr_arg args = {
2285                 .fh = fhandle,
2286                 .bitmask = server->attr_bitmask,
2287         };
2288         struct nfs4_getattr_res res = {
2289                 .fattr = fattr,
2290                 .server = server,
2291         };
2292         struct rpc_message msg = {
2293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2294                 .rpc_argp = &args,
2295                 .rpc_resp = &res,
2296         };
2297
2298         nfs_fattr_init(fattr);
2299         return nfs4_call_sync(server, &msg, &args, &res, 0);
2300 }
2301
2302 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2303 {
2304         struct nfs4_exception exception = { };
2305         int err;
2306         do {
2307                 err = nfs4_handle_exception(server,
2308                                 _nfs4_proc_getattr(server, fhandle, fattr),
2309                                 &exception);
2310         } while (exception.retry);
2311         return err;
2312 }
2313
2314 /*
2315  * The file is not closed if it is opened due to the a request to change
2316  * the size of the file. The open call will not be needed once the
2317  * VFS layer lookup-intents are implemented.
2318  *
2319  * Close is called when the inode is destroyed.
2320  * If we haven't opened the file for O_WRONLY, we
2321  * need to in the size_change case to obtain a stateid.
2322  *
2323  * Got race?
2324  * Because OPEN is always done by name in nfsv4, it is
2325  * possible that we opened a different file by the same
2326  * name.  We can recognize this race condition, but we
2327  * can't do anything about it besides returning an error.
2328  *
2329  * This will be fixed with VFS changes (lookup-intent).
2330  */
2331 static int
2332 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2333                   struct iattr *sattr)
2334 {
2335         struct inode *inode = dentry->d_inode;
2336         struct rpc_cred *cred = NULL;
2337         struct nfs4_state *state = NULL;
2338         int status;
2339
2340         nfs_fattr_init(fattr);
2341
2342         /* Search for an existing open(O_WRITE) file */
2343         if (sattr->ia_valid & ATTR_FILE) {
2344                 struct nfs_open_context *ctx;
2345
2346                 ctx = nfs_file_open_context(sattr->ia_file);
2347                 if (ctx) {
2348                         cred = ctx->cred;
2349                         state = ctx->state;
2350                 }
2351         }
2352
2353         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2354         if (status == 0)
2355                 nfs_setattr_update_inode(inode, sattr);
2356         return status;
2357 }
2358
2359 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2360                 const struct qstr *name, struct nfs_fh *fhandle,
2361                 struct nfs_fattr *fattr)
2362 {
2363         int                    status;
2364         struct nfs4_lookup_arg args = {
2365                 .bitmask = server->attr_bitmask,
2366                 .dir_fh = dirfh,
2367                 .name = name,
2368         };
2369         struct nfs4_lookup_res res = {
2370                 .server = server,
2371                 .fattr = fattr,
2372                 .fh = fhandle,
2373         };
2374         struct rpc_message msg = {
2375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2376                 .rpc_argp = &args,
2377                 .rpc_resp = &res,
2378         };
2379
2380         nfs_fattr_init(fattr);
2381
2382         dprintk("NFS call  lookupfh %s\n", name->name);
2383         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2384         dprintk("NFS reply lookupfh: %d\n", status);
2385         return status;
2386 }
2387
2388 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2389                               struct qstr *name, struct nfs_fh *fhandle,
2390                               struct nfs_fattr *fattr)
2391 {
2392         struct nfs4_exception exception = { };
2393         int err;
2394         do {
2395                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2396                 /* FIXME: !!!! */
2397                 if (err == -NFS4ERR_MOVED) {
2398                         err = -EREMOTE;
2399                         break;
2400                 }
2401                 err = nfs4_handle_exception(server, err, &exception);
2402         } while (exception.retry);
2403         return err;
2404 }
2405
2406 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2407                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2408 {
2409         int status;
2410
2411         dprintk("NFS call  lookup %s\n", name->name);
2412         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2413         if (status == -NFS4ERR_MOVED)
2414                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2415         dprintk("NFS reply lookup: %d\n", status);
2416         return status;
2417 }
2418
2419 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2420 {
2421         struct nfs4_exception exception = { };
2422         int err;
2423         do {
2424                 err = nfs4_handle_exception(NFS_SERVER(dir),
2425                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2426                                 &exception);
2427         } while (exception.retry);
2428         return err;
2429 }
2430
2431 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2432 {
2433         struct nfs_server *server = NFS_SERVER(inode);
2434         struct nfs4_accessargs args = {
2435                 .fh = NFS_FH(inode),
2436                 .bitmask = server->attr_bitmask,
2437         };
2438         struct nfs4_accessres res = {
2439                 .server = server,
2440         };
2441         struct rpc_message msg = {
2442                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2443                 .rpc_argp = &args,
2444                 .rpc_resp = &res,
2445                 .rpc_cred = entry->cred,
2446         };
2447         int mode = entry->mask;
2448         int status;
2449
2450         /*
2451          * Determine which access bits we want to ask for...
2452          */
2453         if (mode & MAY_READ)
2454                 args.access |= NFS4_ACCESS_READ;
2455         if (S_ISDIR(inode->i_mode)) {
2456                 if (mode & MAY_WRITE)
2457                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2458                 if (mode & MAY_EXEC)
2459                         args.access |= NFS4_ACCESS_LOOKUP;
2460         } else {
2461                 if (mode & MAY_WRITE)
2462                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2463                 if (mode & MAY_EXEC)
2464                         args.access |= NFS4_ACCESS_EXECUTE;
2465         }
2466
2467         res.fattr = nfs_alloc_fattr();
2468         if (res.fattr == NULL)
2469                 return -ENOMEM;
2470
2471         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2472         if (!status) {
2473                 entry->mask = 0;
2474                 if (res.access & NFS4_ACCESS_READ)
2475                         entry->mask |= MAY_READ;
2476                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2477                         entry->mask |= MAY_WRITE;
2478                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2479                         entry->mask |= MAY_EXEC;
2480                 nfs_refresh_inode(inode, res.fattr);
2481         }
2482         nfs_free_fattr(res.fattr);
2483         return status;
2484 }
2485
2486 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2487 {
2488         struct nfs4_exception exception = { };
2489         int err;
2490         do {
2491                 err = nfs4_handle_exception(NFS_SERVER(inode),
2492                                 _nfs4_proc_access(inode, entry),
2493                                 &exception);
2494         } while (exception.retry);
2495         return err;
2496 }
2497
2498 /*
2499  * TODO: For the time being, we don't try to get any attributes
2500  * along with any of the zero-copy operations READ, READDIR,
2501  * READLINK, WRITE.
2502  *
2503  * In the case of the first three, we want to put the GETATTR
2504  * after the read-type operation -- this is because it is hard
2505  * to predict the length of a GETATTR response in v4, and thus
2506  * align the READ data correctly.  This means that the GETATTR
2507  * may end up partially falling into the page cache, and we should
2508  * shift it into the 'tail' of the xdr_buf before processing.
2509  * To do this efficiently, we need to know the total length
2510  * of data received, which doesn't seem to be available outside
2511  * of the RPC layer.
2512  *
2513  * In the case of WRITE, we also want to put the GETATTR after
2514  * the operation -- in this case because we want to make sure
2515  * we get the post-operation mtime and size.  This means that
2516  * we can't use xdr_encode_pages() as written: we need a variant
2517  * of it which would leave room in the 'tail' iovec.
2518  *
2519  * Both of these changes to the XDR layer would in fact be quite
2520  * minor, but I decided to leave them for a subsequent patch.
2521  */
2522 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2523                 unsigned int pgbase, unsigned int pglen)
2524 {
2525         struct nfs4_readlink args = {
2526                 .fh       = NFS_FH(inode),
2527                 .pgbase   = pgbase,
2528                 .pglen    = pglen,
2529                 .pages    = &page,
2530         };
2531         struct nfs4_readlink_res res;
2532         struct rpc_message msg = {
2533                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2534                 .rpc_argp = &args,
2535                 .rpc_resp = &res,
2536         };
2537
2538         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2539 }
2540
2541 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2542                 unsigned int pgbase, unsigned int pglen)
2543 {
2544         struct nfs4_exception exception = { };
2545         int err;
2546         do {
2547                 err = nfs4_handle_exception(NFS_SERVER(inode),
2548                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2549                                 &exception);
2550         } while (exception.retry);
2551         return err;
2552 }
2553
2554 /*
2555  * Got race?
2556  * We will need to arrange for the VFS layer to provide an atomic open.
2557  * Until then, this create/open method is prone to inefficiency and race
2558  * conditions due to the lookup, create, and open VFS calls from sys_open()
2559  * placed on the wire.
2560  *
2561  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2562  * The file will be opened again in the subsequent VFS open call
2563  * (nfs4_proc_file_open).
2564  *
2565  * The open for read will just hang around to be used by any process that
2566  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2567  */
2568
2569 static int
2570 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2571                  int flags, struct nameidata *nd)
2572 {
2573         struct path path = {
2574                 .mnt = nd->path.mnt,
2575                 .dentry = dentry,
2576         };
2577         struct nfs4_state *state;
2578         struct rpc_cred *cred;
2579         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2580         int status = 0;
2581
2582         cred = rpc_lookup_cred();
2583         if (IS_ERR(cred)) {
2584                 status = PTR_ERR(cred);
2585                 goto out;
2586         }
2587         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2588         d_drop(dentry);
2589         if (IS_ERR(state)) {
2590                 status = PTR_ERR(state);
2591                 goto out_putcred;
2592         }
2593         d_add(dentry, igrab(state->inode));
2594         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2595         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2596                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2597         else
2598                 nfs4_close_sync(&path, state, fmode);
2599 out_putcred:
2600         put_rpccred(cred);
2601 out:
2602         return status;
2603 }
2604
2605 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2606 {
2607         struct nfs_server *server = NFS_SERVER(dir);
2608         struct nfs_removeargs args = {
2609                 .fh = NFS_FH(dir),
2610                 .name.len = name->len,
2611                 .name.name = name->name,
2612                 .bitmask = server->attr_bitmask,
2613         };
2614         struct nfs_removeres res = {
2615                 .server = server,
2616         };
2617         struct rpc_message msg = {
2618                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2619                 .rpc_argp = &args,
2620                 .rpc_resp = &res,
2621         };
2622         int status = -ENOMEM;
2623
2624         res.dir_attr = nfs_alloc_fattr();
2625         if (res.dir_attr == NULL)
2626                 goto out;
2627
2628         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2629         if (status == 0) {
2630                 update_changeattr(dir, &res.cinfo);
2631                 nfs_post_op_update_inode(dir, res.dir_attr);
2632         }
2633         nfs_free_fattr(res.dir_attr);
2634 out:
2635         return status;
2636 }
2637
2638 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2639 {
2640         struct nfs4_exception exception = { };
2641         int err;
2642         do {
2643                 err = nfs4_handle_exception(NFS_SERVER(dir),
2644                                 _nfs4_proc_remove(dir, name),
2645                                 &exception);
2646         } while (exception.retry);
2647         return err;
2648 }
2649
2650 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2651 {
2652         struct nfs_server *server = NFS_SERVER(dir);
2653         struct nfs_removeargs *args = msg->rpc_argp;
2654         struct nfs_removeres *res = msg->rpc_resp;
2655
2656         args->bitmask = server->cache_consistency_bitmask;
2657         res->server = server;
2658         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2659 }
2660
2661 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2662 {
2663         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2664
2665         if (!nfs4_sequence_done(task, &res->seq_res))
2666                 return 0;
2667         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2668                 return 0;
2669         update_changeattr(dir, &res->cinfo);
2670         nfs_post_op_update_inode(dir, res->dir_attr);
2671         return 1;
2672 }
2673
2674 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2675                 struct inode *new_dir, struct qstr *new_name)
2676 {
2677         struct nfs_server *server = NFS_SERVER(old_dir);
2678         struct nfs4_rename_arg arg = {
2679                 .old_dir = NFS_FH(old_dir),
2680                 .new_dir = NFS_FH(new_dir),
2681                 .old_name = old_name,
2682                 .new_name = new_name,
2683                 .bitmask = server->attr_bitmask,
2684         };
2685         struct nfs4_rename_res res = {
2686                 .server = server,
2687         };
2688         struct rpc_message msg = {
2689                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2690                 .rpc_argp = &arg,
2691                 .rpc_resp = &res,
2692         };
2693         int status = -ENOMEM;
2694
2695         res.old_fattr = nfs_alloc_fattr();
2696         res.new_fattr = nfs_alloc_fattr();
2697         if (res.old_fattr == NULL || res.new_fattr == NULL)
2698                 goto out;
2699
2700         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2701         if (!status) {
2702                 update_changeattr(old_dir, &res.old_cinfo);
2703                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2704                 update_changeattr(new_dir, &res.new_cinfo);
2705                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2706         }
2707 out:
2708         nfs_free_fattr(res.new_fattr);
2709         nfs_free_fattr(res.old_fattr);
2710         return status;
2711 }
2712
2713 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2714                 struct inode *new_dir, struct qstr *new_name)
2715 {
2716         struct nfs4_exception exception = { };
2717         int err;
2718         do {
2719                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2720                                 _nfs4_proc_rename(old_dir, old_name,
2721                                         new_dir, new_name),
2722                                 &exception);
2723         } while (exception.retry);
2724         return err;
2725 }
2726
2727 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2728 {
2729         struct nfs_server *server = NFS_SERVER(inode);
2730         struct nfs4_link_arg arg = {
2731                 .fh     = NFS_FH(inode),
2732                 .dir_fh = NFS_FH(dir),
2733                 .name   = name,
2734                 .bitmask = server->attr_bitmask,
2735         };
2736         struct nfs4_link_res res = {
2737                 .server = server,
2738         };
2739         struct rpc_message msg = {
2740                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2741                 .rpc_argp = &arg,
2742                 .rpc_resp = &res,
2743         };
2744         int status = -ENOMEM;
2745
2746         res.fattr = nfs_alloc_fattr();
2747         res.dir_attr = nfs_alloc_fattr();
2748         if (res.fattr == NULL || res.dir_attr == NULL)
2749                 goto out;
2750
2751         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2752         if (!status) {
2753                 update_changeattr(dir, &res.cinfo);
2754                 nfs_post_op_update_inode(dir, res.dir_attr);
2755                 nfs_post_op_update_inode(inode, res.fattr);
2756         }
2757 out:
2758         nfs_free_fattr(res.dir_attr);
2759         nfs_free_fattr(res.fattr);
2760         return status;
2761 }
2762
2763 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2764 {
2765         struct nfs4_exception exception = { };
2766         int err;
2767         do {
2768                 err = nfs4_handle_exception(NFS_SERVER(inode),
2769                                 _nfs4_proc_link(inode, dir, name),
2770                                 &exception);
2771         } while (exception.retry);
2772         return err;
2773 }
2774
2775 struct nfs4_createdata {
2776         struct rpc_message msg;
2777         struct nfs4_create_arg arg;
2778         struct nfs4_create_res res;
2779         struct nfs_fh fh;
2780         struct nfs_fattr fattr;
2781         struct nfs_fattr dir_fattr;
2782 };
2783
2784 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2785                 struct qstr *name, struct iattr *sattr, u32 ftype)
2786 {
2787         struct nfs4_createdata *data;
2788
2789         data = kzalloc(sizeof(*data), GFP_KERNEL);
2790         if (data != NULL) {
2791                 struct nfs_server *server = NFS_SERVER(dir);
2792
2793                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2794                 data->msg.rpc_argp = &data->arg;
2795                 data->msg.rpc_resp = &data->res;
2796                 data->arg.dir_fh = NFS_FH(dir);
2797                 data->arg.server = server;
2798                 data->arg.name = name;
2799                 data->arg.attrs = sattr;
2800                 data->arg.ftype = ftype;
2801                 data->arg.bitmask = server->attr_bitmask;
2802                 data->res.server = server;
2803                 data->res.fh = &data->fh;
2804                 data->res.fattr = &data->fattr;
2805                 data->res.dir_fattr = &data->dir_fattr;
2806                 nfs_fattr_init(data->res.fattr);
2807                 nfs_fattr_init(data->res.dir_fattr);
2808         }
2809         return data;
2810 }
2811
2812 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2813 {
2814         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2815                                     &data->arg, &data->res, 1);
2816         if (status == 0) {
2817                 update_changeattr(dir, &data->res.dir_cinfo);
2818                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2819                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2820         }
2821         return status;
2822 }
2823
2824 static void nfs4_free_createdata(struct nfs4_createdata *data)
2825 {
2826         kfree(data);
2827 }
2828
2829 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2830                 struct page *page, unsigned int len, struct iattr *sattr)
2831 {
2832         struct nfs4_createdata *data;
2833         int status = -ENAMETOOLONG;
2834
2835         if (len > NFS4_MAXPATHLEN)
2836                 goto out;
2837
2838         status = -ENOMEM;
2839         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2840         if (data == NULL)
2841                 goto out;
2842
2843         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2844         data->arg.u.symlink.pages = &page;
2845         data->arg.u.symlink.len = len;
2846
2847         status = nfs4_do_create(dir, dentry, data);
2848
2849         nfs4_free_createdata(data);
2850 out:
2851         return status;
2852 }
2853
2854 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2855                 struct page *page, unsigned int len, struct iattr *sattr)
2856 {
2857         struct nfs4_exception exception = { };
2858         int err;
2859         do {
2860                 err = nfs4_handle_exception(NFS_SERVER(dir),
2861                                 _nfs4_proc_symlink(dir, dentry, page,
2862                                                         len, sattr),
2863                                 &exception);
2864         } while (exception.retry);
2865         return err;
2866 }
2867
2868 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2869                 struct iattr *sattr)
2870 {
2871         struct nfs4_createdata *data;
2872         int status = -ENOMEM;
2873
2874         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2875         if (data == NULL)
2876                 goto out;
2877
2878         status = nfs4_do_create(dir, dentry, data);
2879
2880         nfs4_free_createdata(data);
2881 out:
2882         return status;
2883 }
2884
2885 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2886                 struct iattr *sattr)
2887 {
2888         struct nfs4_exception exception = { };
2889         int err;
2890         do {
2891                 err = nfs4_handle_exception(NFS_SERVER(dir),
2892                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2893                                 &exception);
2894         } while (exception.retry);
2895         return err;
2896 }
2897
2898 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2899                   u64 cookie, struct page *page, unsigned int count, int plus)
2900 {
2901         struct inode            *dir = dentry->d_inode;
2902         struct nfs4_readdir_arg args = {
2903                 .fh = NFS_FH(dir),
2904                 .pages = &page,
2905                 .pgbase = 0,
2906                 .count = count,
2907                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2908         };
2909         struct nfs4_readdir_res res;
2910         struct rpc_message msg = {
2911                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2912                 .rpc_argp = &args,
2913                 .rpc_resp = &res,
2914                 .rpc_cred = cred,
2915         };
2916         int                     status;
2917
2918         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2919                         dentry->d_parent->d_name.name,
2920                         dentry->d_name.name,
2921                         (unsigned long long)cookie);
2922         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2923         res.pgbase = args.pgbase;
2924         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2925         if (status == 0)
2926                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2927
2928         nfs_invalidate_atime(dir);
2929
2930         dprintk("%s: returns %d\n", __func__, status);
2931         return status;
2932 }
2933
2934 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2935                   u64 cookie, struct page *page, unsigned int count, int plus)
2936 {
2937         struct nfs4_exception exception = { };
2938         int err;
2939         do {
2940                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2941                                 _nfs4_proc_readdir(dentry, cred, cookie,
2942                                         page, count, plus),
2943                                 &exception);
2944         } while (exception.retry);
2945         return err;
2946 }
2947
2948 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2949                 struct iattr *sattr, dev_t rdev)
2950 {
2951         struct nfs4_createdata *data;
2952         int mode = sattr->ia_mode;
2953         int status = -ENOMEM;
2954
2955         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2956         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2957
2958         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2959         if (data == NULL)
2960                 goto out;
2961
2962         if (S_ISFIFO(mode))
2963                 data->arg.ftype = NF4FIFO;
2964         else if (S_ISBLK(mode)) {
2965                 data->arg.ftype = NF4BLK;
2966                 data->arg.u.device.specdata1 = MAJOR(rdev);
2967                 data->arg.u.device.specdata2 = MINOR(rdev);
2968         }
2969         else if (S_ISCHR(mode)) {
2970                 data->arg.ftype = NF4CHR;
2971                 data->arg.u.device.specdata1 = MAJOR(rdev);
2972                 data->arg.u.device.specdata2 = MINOR(rdev);
2973         }
2974
2975         status = nfs4_do_create(dir, dentry, data);
2976
2977         nfs4_free_createdata(data);
2978 out:
2979         return status;
2980 }
2981
2982 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2983                 struct iattr *sattr, dev_t rdev)
2984 {
2985         struct nfs4_exception exception = { };
2986         int err;
2987         do {
2988                 err = nfs4_handle_exception(NFS_SERVER(dir),
2989                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2990                                 &exception);
2991         } while (exception.retry);
2992         return err;
2993 }
2994
2995 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2996                  struct nfs_fsstat *fsstat)
2997 {
2998         struct nfs4_statfs_arg args = {
2999                 .fh = fhandle,
3000                 .bitmask = server->attr_bitmask,
3001         };
3002         struct nfs4_statfs_res res = {
3003                 .fsstat = fsstat,
3004         };
3005         struct rpc_message msg = {
3006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3007                 .rpc_argp = &args,
3008                 .rpc_resp = &res,
3009         };
3010
3011         nfs_fattr_init(fsstat->fattr);
3012         return  nfs4_call_sync(server, &msg, &args, &res, 0);
3013 }
3014
3015 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3016 {
3017         struct nfs4_exception exception = { };
3018         int err;
3019         do {
3020                 err = nfs4_handle_exception(server,
3021                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3022                                 &exception);
3023         } while (exception.retry);
3024         return err;
3025 }
3026
3027 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3028                 struct nfs_fsinfo *fsinfo)
3029 {
3030         struct nfs4_fsinfo_arg args = {
3031                 .fh = fhandle,
3032                 .bitmask = server->attr_bitmask,
3033         };
3034         struct nfs4_fsinfo_res res = {
3035                 .fsinfo = fsinfo,
3036         };
3037         struct rpc_message msg = {
3038                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3039                 .rpc_argp = &args,
3040                 .rpc_resp = &res,
3041         };
3042
3043         return nfs4_call_sync(server, &msg, &args, &res, 0);
3044 }
3045
3046 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3047 {
3048         struct nfs4_exception exception = { };
3049         int err;
3050
3051         do {
3052                 err = nfs4_handle_exception(server,
3053                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3054                                 &exception);
3055         } while (exception.retry);
3056         return err;
3057 }
3058
3059 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3060 {
3061         nfs_fattr_init(fsinfo->fattr);
3062         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3063 }
3064
3065 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3066                 struct nfs_pathconf *pathconf)
3067 {
3068         struct nfs4_pathconf_arg args = {
3069                 .fh = fhandle,
3070                 .bitmask = server->attr_bitmask,
3071         };
3072         struct nfs4_pathconf_res res = {
3073                 .pathconf = pathconf,
3074         };
3075         struct rpc_message msg = {
3076                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3077                 .rpc_argp = &args,
3078                 .rpc_resp = &res,
3079         };
3080
3081         /* None of the pathconf attributes are mandatory to implement */
3082         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3083                 memset(pathconf, 0, sizeof(*pathconf));
3084                 return 0;
3085         }
3086
3087         nfs_fattr_init(pathconf->fattr);
3088         return nfs4_call_sync(server, &msg, &args, &res, 0);
3089 }
3090
3091 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3092                 struct nfs_pathconf *pathconf)
3093 {
3094         struct nfs4_exception exception = { };
3095         int err;
3096
3097         do {
3098                 err = nfs4_handle_exception(server,
3099                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3100                                 &exception);
3101         } while (exception.retry);
3102         return err;
3103 }
3104
3105 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3106 {
3107         struct nfs_server *server = NFS_SERVER(data->inode);
3108
3109         dprintk("--> %s\n", __func__);
3110
3111         if (!nfs4_sequence_done(task, &data->res.seq_res))
3112                 return -EAGAIN;
3113
3114         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3115                 nfs_restart_rpc(task, server->nfs_client);
3116                 return -EAGAIN;
3117         }
3118
3119         nfs_invalidate_atime(data->inode);
3120         if (task->tk_status > 0)
3121                 renew_lease(server, data->timestamp);
3122         return 0;
3123 }
3124
3125 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3126 {
3127         data->timestamp   = jiffies;
3128         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3129 }
3130
3131 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3132 {
3133         struct inode *inode = data->inode;
3134
3135         if (!nfs4_sequence_done(task, &data->res.seq_res))
3136                 return -EAGAIN;
3137
3138         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3139                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3140                 return -EAGAIN;
3141         }
3142         if (task->tk_status >= 0) {
3143                 renew_lease(NFS_SERVER(inode), data->timestamp);
3144                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3145         }
3146         return 0;
3147 }
3148
3149 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3150 {
3151         struct nfs_server *server = NFS_SERVER(data->inode);
3152
3153         data->args.bitmask = server->cache_consistency_bitmask;
3154         data->res.server = server;
3155         data->timestamp   = jiffies;
3156
3157         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3158 }
3159
3160 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3161 {
3162         struct inode *inode = data->inode;
3163
3164         if (!nfs4_sequence_done(task, &data->res.seq_res))
3165                 return -EAGAIN;
3166
3167         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3168                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3169                 return -EAGAIN;
3170         }
3171         nfs_refresh_inode(inode, data->res.fattr);
3172         return 0;
3173 }
3174
3175 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3176 {
3177         struct nfs_server *server = NFS_SERVER(data->inode);
3178
3179         data->args.bitmask = server->cache_consistency_bitmask;
3180         data->res.server = server;
3181         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3182 }
3183
3184 struct nfs4_renewdata {
3185         struct nfs_client       *client;
3186         unsigned long           timestamp;
3187 };
3188
3189 /*
3190  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3191  * standalone procedure for queueing an asynchronous RENEW.
3192  */
3193 static void nfs4_renew_release(void *calldata)
3194 {
3195         struct nfs4_renewdata *data = calldata;
3196         struct nfs_client *clp = data->client;
3197
3198         if (atomic_read(&clp->cl_count) > 1)
3199                 nfs4_schedule_state_renewal(clp);
3200         nfs_put_client(clp);
3201         kfree(data);
3202 }
3203
3204 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3205 {
3206         struct nfs4_renewdata *data = calldata;
3207         struct nfs_client *clp = data->client;
3208         unsigned long timestamp = data->timestamp;
3209
3210         if (task->tk_status < 0) {
3211                 /* Unless we're shutting down, schedule state recovery! */
3212                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3213                         nfs4_schedule_state_recovery(clp);
3214                 return;
3215         }
3216         do_renew_lease(clp, timestamp);
3217 }
3218
3219 static const struct rpc_call_ops nfs4_renew_ops = {
3220         .rpc_call_done = nfs4_renew_done,
3221         .rpc_release = nfs4_renew_release,
3222 };
3223
3224 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3225 {
3226         struct rpc_message msg = {
3227                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3228                 .rpc_argp       = clp,
3229                 .rpc_cred       = cred,
3230         };
3231         struct nfs4_renewdata *data;
3232
3233         if (!atomic_inc_not_zero(&clp->cl_count))
3234                 return -EIO;
3235         data = kmalloc(sizeof(*data), GFP_KERNEL);
3236         if (data == NULL)
3237                 return -ENOMEM;
3238         data->client = clp;
3239         data->timestamp = jiffies;
3240         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3241                         &nfs4_renew_ops, data);
3242 }
3243
3244 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3245 {
3246         struct rpc_message msg = {
3247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3248                 .rpc_argp       = clp,
3249                 .rpc_cred       = cred,
3250         };
3251         unsigned long now = jiffies;
3252         int status;
3253
3254         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3255         if (status < 0)
3256                 return status;
3257         do_renew_lease(clp, now);
3258         return 0;
3259 }
3260
3261 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3262 {
3263         return (server->caps & NFS_CAP_ACLS)
3264                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3265                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3266 }
3267
3268 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3269  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3270  * the stack.
3271  */
3272 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3273
3274 static void buf_to_pages(const void *buf, size_t buflen,
3275                 struct page **pages, unsigned int *pgbase)
3276 {
3277         const void *p = buf;
3278
3279         *pgbase = offset_in_page(buf);
3280         p -= *pgbase;
3281         while (p < buf + buflen) {
3282                 *(pages++) = virt_to_page(p);
3283                 p += PAGE_CACHE_SIZE;
3284         }
3285 }
3286
3287 struct nfs4_cached_acl {
3288         int cached;
3289         size_t len;
3290         char data[0];
3291 };
3292
3293 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3294 {
3295         struct nfs_inode *nfsi = NFS_I(inode);
3296
3297         spin_lock(&inode->i_lock);
3298         kfree(nfsi->nfs4_acl);
3299         nfsi->nfs4_acl = acl;
3300         spin_unlock(&inode->i_lock);
3301 }
3302
3303 static void nfs4_zap_acl_attr(struct inode *inode)
3304 {
3305         nfs4_set_cached_acl(inode, NULL);
3306 }
3307
3308 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3309 {
3310         struct nfs_inode *nfsi = NFS_I(inode);
3311         struct nfs4_cached_acl *acl;
3312         int ret = -ENOENT;
3313
3314         spin_lock(&inode->i_lock);
3315         acl = nfsi->nfs4_acl;
3316         if (acl == NULL)
3317                 goto out;
3318         if (buf == NULL) /* user is just asking for length */
3319                 goto out_len;
3320         if (acl->cached == 0)
3321                 goto out;
3322         ret = -ERANGE; /* see getxattr(2) man page */
3323         if (acl->len > buflen)
3324                 goto out;
3325         memcpy(buf, acl->data, acl->len);
3326 out_len:
3327         ret = acl->len;
3328 out:
3329         spin_unlock(&inode->i_lock);
3330         return ret;
3331 }
3332
3333 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3334 {
3335         struct nfs4_cached_acl *acl;
3336
3337         if (buf && acl_len <= PAGE_SIZE) {
3338                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3339                 if (acl == NULL)
3340                         goto out;
3341                 acl->cached = 1;
3342                 memcpy(acl->data, buf, acl_len);
3343         } else {
3344                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3345                 if (acl == NULL)
3346                         goto out;
3347                 acl->cached = 0;
3348         }
3349         acl->len = acl_len;
3350 out:
3351         nfs4_set_cached_acl(inode, acl);
3352 }
3353
3354 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3355 {
3356         struct page *pages[NFS4ACL_MAXPAGES];
3357         struct nfs_getaclargs args = {
3358                 .fh = NFS_FH(inode),
3359                 .acl_pages = pages,
3360                 .acl_len = buflen,
3361         };
3362         struct nfs_getaclres res = {
3363                 .acl_len = buflen,
3364         };
3365         void *resp_buf;
3366         struct rpc_message msg = {
3367                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3368                 .rpc_argp = &args,
3369                 .rpc_resp = &res,
3370         };
3371         struct page *localpage = NULL;
3372         int ret;
3373
3374         if (buflen < PAGE_SIZE) {
3375                 /* As long as we're doing a round trip to the server anyway,
3376                  * let's be prepared for a page of acl data. */
3377                 localpage = alloc_page(GFP_KERNEL);
3378                 resp_buf = page_address(localpage);
3379                 if (localpage == NULL)
3380                         return -ENOMEM;
3381                 args.acl_pages[0] = localpage;
3382                 args.acl_pgbase = 0;
3383                 args.acl_len = PAGE_SIZE;
3384         } else {
3385                 resp_buf = buf;
3386                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3387         }
3388         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3389         if (ret)
3390                 goto out_free;
3391         if (res.acl_len > args.acl_len)
3392                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3393         else
3394                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3395         if (buf) {
3396                 ret = -ERANGE;
3397                 if (res.acl_len > buflen)
3398                         goto out_free;
3399                 if (localpage)
3400                         memcpy(buf, resp_buf, res.acl_len);
3401         }
3402         ret = res.acl_len;
3403 out_free:
3404         if (localpage)
3405                 __free_page(localpage);
3406         return ret;
3407 }
3408
3409 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3410 {
3411         struct nfs4_exception exception = { };
3412         ssize_t ret;
3413         do {
3414                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3415                 if (ret >= 0)
3416                         break;
3417                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3418         } while (exception.retry);
3419         return ret;
3420 }
3421
3422 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3423 {
3424         struct nfs_server *server = NFS_SERVER(inode);
3425         int ret;
3426
3427         if (!nfs4_server_supports_acls(server))
3428                 return -EOPNOTSUPP;
3429         ret = nfs_revalidate_inode(server, inode);
3430         if (ret < 0)
3431                 return ret;
3432         ret = nfs4_read_cached_acl(inode, buf, buflen);
3433         if (ret != -ENOENT)
3434                 return ret;
3435         return nfs4_get_acl_uncached(inode, buf, buflen);
3436 }
3437
3438 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3439 {
3440         struct nfs_server *server = NFS_SERVER(inode);
3441         struct page *pages[NFS4ACL_MAXPAGES];
3442         struct nfs_setaclargs arg = {
3443                 .fh             = NFS_FH(inode),
3444                 .acl_pages      = pages,
3445                 .acl_len        = buflen,
3446         };
3447         struct nfs_setaclres res;
3448         struct rpc_message msg = {
3449                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3450                 .rpc_argp       = &arg,
3451                 .rpc_resp       = &res,
3452         };
3453         int ret;
3454
3455         if (!nfs4_server_supports_acls(server))
3456                 return -EOPNOTSUPP;
3457         nfs_inode_return_delegation(inode);
3458         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3459         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3460         nfs_access_zap_cache(inode);
3461         nfs_zap_acl_cache(inode);
3462         return ret;
3463 }
3464
3465 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3466 {
3467         struct nfs4_exception exception = { };
3468         int err;
3469         do {
3470                 err = nfs4_handle_exception(NFS_SERVER(inode),
3471                                 __nfs4_proc_set_acl(inode, buf, buflen),
3472                                 &exception);
3473         } while (exception.retry);
3474         return err;
3475 }
3476
3477 static int
3478 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3479 {
3480         struct nfs_client *clp = server->nfs_client;
3481
3482         if (task->tk_status >= 0)
3483                 return 0;
3484         switch(task->tk_status) {
3485                 case -NFS4ERR_ADMIN_REVOKED:
3486                 case -NFS4ERR_BAD_STATEID:
3487                 case -NFS4ERR_OPENMODE:
3488                         if (state == NULL)
3489                                 break;
3490                         nfs4_state_mark_reclaim_nograce(clp, state);
3491                         goto do_state_recovery;
3492                 case -NFS4ERR_STALE_STATEID:
3493                         if (state == NULL)
3494                                 break;
3495                         nfs4_state_mark_reclaim_reboot(clp, state);
3496                 case -NFS4ERR_STALE_CLIENTID:
3497                 case -NFS4ERR_EXPIRED:
3498                         goto do_state_recovery;
3499 #if defined(CONFIG_NFS_V4_1)
3500                 case -NFS4ERR_BADSESSION:
3501                 case -NFS4ERR_BADSLOT:
3502                 case -NFS4ERR_BAD_HIGH_SLOT:
3503                 case -NFS4ERR_DEADSESSION:
3504                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3505                 case -NFS4ERR_SEQ_FALSE_RETRY:
3506                 case -NFS4ERR_SEQ_MISORDERED:
3507                         dprintk("%s ERROR %d, Reset session\n", __func__,
3508                                 task->tk_status);
3509                         nfs4_schedule_state_recovery(clp);
3510                         task->tk_status = 0;
3511                         return -EAGAIN;
3512 #endif /* CONFIG_NFS_V4_1 */
3513                 case -NFS4ERR_DELAY:
3514                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3515                 case -NFS4ERR_GRACE:
3516                 case -EKEYEXPIRED:
3517                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3518                         task->tk_status = 0;
3519                         return -EAGAIN;
3520                 case -NFS4ERR_OLD_STATEID:
3521                         task->tk_status = 0;
3522                         return -EAGAIN;
3523         }
3524         task->tk_status = nfs4_map_errors(task->tk_status);
3525         return 0;
3526 do_state_recovery:
3527         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3528         nfs4_schedule_state_recovery(clp);
3529         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3530                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3531         task->tk_status = 0;
3532         return -EAGAIN;
3533 }
3534
3535 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3536                 unsigned short port, struct rpc_cred *cred,
3537                 struct nfs4_setclientid_res *res)
3538 {
3539         nfs4_verifier sc_verifier;
3540         struct nfs4_setclientid setclientid = {
3541                 .sc_verifier = &sc_verifier,
3542                 .sc_prog = program,
3543         };
3544         struct rpc_message msg = {
3545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3546                 .rpc_argp = &setclientid,
3547                 .rpc_resp = res,
3548                 .rpc_cred = cred,
3549         };
3550         __be32 *p;
3551         int loop = 0;
3552         int status;
3553
3554         p = (__be32*)sc_verifier.data;
3555         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3556         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3557
3558         for(;;) {
3559                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3560                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3561                                 clp->cl_ipaddr,
3562                                 rpc_peeraddr2str(clp->cl_rpcclient,
3563                                                         RPC_DISPLAY_ADDR),
3564                                 rpc_peeraddr2str(clp->cl_rpcclient,
3565                                                         RPC_DISPLAY_PROTO),
3566                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3567                                 clp->cl_id_uniquifier);
3568                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3569                                 sizeof(setclientid.sc_netid),
3570                                 rpc_peeraddr2str(clp->cl_rpcclient,
3571                                                         RPC_DISPLAY_NETID));
3572                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3573                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3574                                 clp->cl_ipaddr, port >> 8, port & 255);
3575
3576                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3577                 if (status != -NFS4ERR_CLID_INUSE)
3578                         break;
3579                 if (signalled())
3580                         break;
3581                 if (loop++ & 1)
3582                         ssleep(clp->cl_lease_time + 1);
3583                 else
3584                         if (++clp->cl_id_uniquifier == 0)
3585                                 break;
3586         }
3587         return status;
3588 }
3589
3590 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3591                 struct nfs4_setclientid_res *arg,
3592                 struct rpc_cred *cred)
3593 {
3594         struct nfs_fsinfo fsinfo;
3595         struct rpc_message msg = {
3596                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3597                 .rpc_argp = arg,
3598                 .rpc_resp = &fsinfo,
3599                 .rpc_cred = cred,
3600         };
3601         unsigned long now;
3602         int status;
3603
3604         now = jiffies;
3605         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3606         if (status == 0) {
3607                 spin_lock(&clp->cl_lock);
3608                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3609                 clp->cl_last_renewal = now;
3610                 spin_unlock(&clp->cl_lock);
3611         }
3612         return status;
3613 }
3614
3615 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3616                 struct nfs4_setclientid_res *arg,
3617                 struct rpc_cred *cred)
3618 {
3619         long timeout = 0;
3620         int err;
3621         do {
3622                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3623                 switch (err) {
3624                         case 0:
3625                                 return err;
3626                         case -NFS4ERR_RESOURCE:
3627                                 /* The IBM lawyers misread another document! */
3628                         case -NFS4ERR_DELAY:
3629                         case -EKEYEXPIRED:
3630                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3631                 }
3632         } while (err == 0);
3633         return err;
3634 }
3635
3636 struct nfs4_delegreturndata {
3637         struct nfs4_delegreturnargs args;
3638         struct nfs4_delegreturnres res;
3639         struct nfs_fh fh;
3640         nfs4_stateid stateid;
3641         unsigned long timestamp;
3642         struct nfs_fattr fattr;
3643         int rpc_status;
3644 };
3645
3646 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3647 {
3648         struct nfs4_delegreturndata *data = calldata;
3649
3650         if (!nfs4_sequence_done(task, &data->res.seq_res))
3651                 return;
3652
3653         switch (task->tk_status) {
3654         case -NFS4ERR_STALE_STATEID:
3655         case -NFS4ERR_EXPIRED:
3656         case 0:
3657                 renew_lease(data->res.server, data->timestamp);
3658                 break;
3659         default:
3660                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3661                                 -EAGAIN) {
3662                         nfs_restart_rpc(task, data->res.server->nfs_client);
3663                         return;
3664                 }
3665         }
3666         data->rpc_status = task->tk_status;
3667 }
3668
3669 static void nfs4_delegreturn_release(void *calldata)
3670 {
3671         kfree(calldata);
3672 }
3673
3674 #if defined(CONFIG_NFS_V4_1)
3675 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3676 {
3677         struct nfs4_delegreturndata *d_data;
3678
3679         d_data = (struct nfs4_delegreturndata *)data;
3680
3681         if (nfs4_setup_sequence(d_data->res.server,
3682                                 &d_data->args.seq_args,
3683                                 &d_data->res.seq_res, 1, task))
3684                 return;
3685         rpc_call_start(task);
3686 }
3687 #endif /* CONFIG_NFS_V4_1 */
3688
3689 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3690 #if defined(CONFIG_NFS_V4_1)
3691         .rpc_call_prepare = nfs4_delegreturn_prepare,
3692 #endif /* CONFIG_NFS_V4_1 */
3693         .rpc_call_done = nfs4_delegreturn_done,
3694         .rpc_release = nfs4_delegreturn_release,
3695 };
3696
3697 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3698 {
3699         struct nfs4_delegreturndata *data;
3700         struct nfs_server *server = NFS_SERVER(inode);
3701         struct rpc_task *task;
3702         struct rpc_message msg = {
3703                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3704                 .rpc_cred = cred,
3705         };
3706         struct rpc_task_setup task_setup_data = {
3707                 .rpc_client = server->client,
3708                 .rpc_message = &msg,
3709                 .callback_ops = &nfs4_delegreturn_ops,
3710                 .flags = RPC_TASK_ASYNC,
3711         };
3712         int status = 0;
3713
3714         data = kzalloc(sizeof(*data), GFP_NOFS);
3715         if (data == NULL)
3716                 return -ENOMEM;
3717         data->args.fhandle = &data->fh;
3718         data->args.stateid = &data->stateid;
3719         data->args.bitmask = server->attr_bitmask;
3720         nfs_copy_fh(&data->fh, NFS_FH(inode));
3721         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3722         data->res.fattr = &data->fattr;
3723         data->res.server = server;
3724         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3725         nfs_fattr_init(data->res.fattr);
3726         data->timestamp = jiffies;
3727         data->rpc_status = 0;
3728
3729         task_setup_data.callback_data = data;
3730         msg.rpc_argp = &data->args,
3731         msg.rpc_resp = &data->res,
3732         task = rpc_run_task(&task_setup_data);
3733         if (IS_ERR(task))
3734                 return PTR_ERR(task);
3735         if (!issync)
3736                 goto out;
3737         status = nfs4_wait_for_completion_rpc_task(task);
3738         if (status != 0)
3739                 goto out;
3740         status = data->rpc_status;
3741         if (status != 0)
3742                 goto out;
3743         nfs_refresh_inode(inode, &data->fattr);
3744 out:
3745         rpc_put_task(task);
3746         return status;
3747 }
3748
3749 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3750 {
3751         struct nfs_server *server = NFS_SERVER(inode);
3752         struct nfs4_exception exception = { };
3753         int err;
3754         do {
3755                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3756                 switch (err) {
3757                         case -NFS4ERR_STALE_STATEID:
3758                         case -NFS4ERR_EXPIRED:
3759                         case 0:
3760                                 return 0;
3761                 }
3762                 err = nfs4_handle_exception(server, err, &exception);
3763         } while (exception.retry);
3764         return err;
3765 }
3766
3767 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3768 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3769
3770 /*
3771  * sleep, with exponential backoff, and retry the LOCK operation.
3772  */
3773 static unsigned long
3774 nfs4_set_lock_task_retry(unsigned long timeout)
3775 {
3776         schedule_timeout_killable(timeout);
3777         timeout <<= 1;
3778         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3779                 return NFS4_LOCK_MAXTIMEOUT;
3780         return timeout;
3781 }
3782
3783 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3784 {
3785         struct inode *inode = state->inode;
3786         struct nfs_server *server = NFS_SERVER(inode);
3787         struct nfs_client *clp = server->nfs_client;
3788         struct nfs_lockt_args arg = {
3789                 .fh = NFS_FH(inode),
3790                 .fl = request,
3791         };
3792         struct nfs_lockt_res res = {
3793                 .denied = request,
3794         };
3795         struct rpc_message msg = {
3796                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3797                 .rpc_argp       = &arg,
3798                 .rpc_resp       = &res,
3799                 .rpc_cred       = state->owner->so_cred,
3800         };
3801         struct nfs4_lock_state *lsp;
3802         int status;
3803
3804         arg.lock_owner.clientid = clp->cl_clientid;
3805         status = nfs4_set_lock_state(state, request);
3806         if (status != 0)
3807                 goto out;
3808         lsp = request->fl_u.nfs4_fl.owner;
3809         arg.lock_owner.id = lsp->ls_id.id;
3810         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3811         switch (status) {
3812                 case 0:
3813                         request->fl_type = F_UNLCK;
3814                         break;
3815                 case -NFS4ERR_DENIED:
3816                         status = 0;
3817         }
3818         request->fl_ops->fl_release_private(request);
3819 out:
3820         return status;
3821 }
3822
3823 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3824 {
3825         struct nfs4_exception exception = { };
3826         int err;
3827
3828         do {
3829                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3830                                 _nfs4_proc_getlk(state, cmd, request),
3831                                 &exception);
3832         } while (exception.retry);
3833         return err;
3834 }
3835
3836 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3837 {
3838         int res = 0;
3839         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3840                 case FL_POSIX:
3841                         res = posix_lock_file_wait(file, fl);
3842                         break;
3843                 case FL_FLOCK:
3844                         res = flock_lock_file_wait(file, fl);
3845                         break;
3846                 default:
3847                         BUG();
3848         }
3849         return res;
3850 }
3851
3852 struct nfs4_unlockdata {
3853         struct nfs_locku_args arg;
3854         struct nfs_locku_res res;
3855         struct nfs4_lock_state *lsp;
3856         struct nfs_open_context *ctx;
3857         struct file_lock fl;
3858         const struct nfs_server *server;
3859         unsigned long timestamp;
3860 };
3861
3862 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3863                 struct nfs_open_context *ctx,
3864                 struct nfs4_lock_state *lsp,
3865                 struct nfs_seqid *seqid)
3866 {
3867         struct nfs4_unlockdata *p;
3868         struct inode *inode = lsp->ls_state->inode;
3869
3870         p = kzalloc(sizeof(*p), GFP_NOFS);
3871         if (p == NULL)
3872                 return NULL;
3873         p->arg.fh = NFS_FH(inode);
3874         p->arg.fl = &p->fl;
3875         p->arg.seqid = seqid;
3876         p->res.seqid = seqid;
3877         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3878         p->arg.stateid = &lsp->ls_stateid;
3879         p->lsp = lsp;
3880         atomic_inc(&lsp->ls_count);
3881         /* Ensure we don't close file until we're done freeing locks! */
3882         p->ctx = get_nfs_open_context(ctx);
3883         memcpy(&p->fl, fl, sizeof(p->fl));
3884         p->server = NFS_SERVER(inode);
3885         return p;
3886 }
3887
3888 static void nfs4_locku_release_calldata(void *data)
3889 {
3890         struct nfs4_unlockdata *calldata = data;
3891         nfs_free_seqid(calldata->arg.seqid);
3892         nfs4_put_lock_state(calldata->lsp);
3893         put_nfs_open_context(calldata->ctx);
3894         kfree(calldata);
3895 }
3896
3897 static void nfs4_locku_done(struct rpc_task *task, void *data)
3898 {
3899         struct nfs4_unlockdata *calldata = data;
3900
3901         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3902                 return;
3903         switch (task->tk_status) {
3904                 case 0:
3905                         memcpy(calldata->lsp->ls_stateid.data,
3906                                         calldata->res.stateid.data,
3907                                         sizeof(calldata->lsp->ls_stateid.data));
3908                         renew_lease(calldata->server, calldata->timestamp);
3909                         break;
3910                 case -NFS4ERR_BAD_STATEID:
3911                 case -NFS4ERR_OLD_STATEID:
3912                 case -NFS4ERR_STALE_STATEID:
3913                 case -NFS4ERR_EXPIRED:
3914                         break;
3915                 default:
3916                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3917                                 nfs_restart_rpc(task,
3918                                                  calldata->server->nfs_client);
3919         }
3920 }
3921
3922 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3923 {
3924         struct nfs4_unlockdata *calldata = data;
3925
3926         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3927                 return;
3928         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3929                 /* Note: exit _without_ running nfs4_locku_done */
3930                 task->tk_action = NULL;
3931                 return;
3932         }
3933         calldata->timestamp = jiffies;
3934         if (nfs4_setup_sequence(calldata->server,
3935                                 &calldata->arg.seq_args,
3936                                 &calldata->res.seq_res, 1, task))
3937                 return;
3938         rpc_call_start(task);
3939 }
3940
3941 static const struct rpc_call_ops nfs4_locku_ops = {
3942         .rpc_call_prepare = nfs4_locku_prepare,
3943         .rpc_call_done = nfs4_locku_done,
3944         .rpc_release = nfs4_locku_release_calldata,
3945 };
3946
3947 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3948                 struct nfs_open_context *ctx,
3949                 struct nfs4_lock_state *lsp,
3950                 struct nfs_seqid *seqid)
3951 {
3952         struct nfs4_unlockdata *data;
3953         struct rpc_message msg = {
3954                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3955                 .rpc_cred = ctx->cred,
3956         };
3957         struct rpc_task_setup task_setup_data = {
3958                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3959                 .rpc_message = &msg,
3960                 .callback_ops = &nfs4_locku_ops,
3961                 .workqueue = nfsiod_workqueue,
3962                 .flags = RPC_TASK_ASYNC,
3963         };
3964
3965         /* Ensure this is an unlock - when canceling a lock, the
3966          * canceled lock is passed in, and it won't be an unlock.
3967          */
3968         fl->fl_type = F_UNLCK;
3969
3970         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3971         if (data == NULL) {
3972                 nfs_free_seqid(seqid);
3973                 return ERR_PTR(-ENOMEM);
3974         }
3975
3976         msg.rpc_argp = &data->arg,
3977         msg.rpc_resp = &data->res,
3978         task_setup_data.callback_data = data;
3979         return rpc_run_task(&task_setup_data);
3980 }
3981
3982 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3983 {
3984         struct nfs_inode *nfsi = NFS_I(state->inode);
3985         struct nfs_seqid *seqid;
3986         struct nfs4_lock_state *lsp;
3987         struct rpc_task *task;
3988         int status = 0;
3989         unsigned char fl_flags = request->fl_flags;
3990
3991         status = nfs4_set_lock_state(state, request);
3992         /* Unlock _before_ we do the RPC call */
3993         request->fl_flags |= FL_EXISTS;
3994         down_read(&nfsi->rwsem);
3995         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3996                 up_read(&nfsi->rwsem);
3997                 goto out;
3998         }
3999         up_read(&nfsi->rwsem);
4000         if (status != 0)
4001                 goto out;
4002         /* Is this a delegated lock? */
4003         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4004                 goto out;
4005         lsp = request->fl_u.nfs4_fl.owner;
4006         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4007         status = -ENOMEM;
4008         if (seqid == NULL)
4009                 goto out;
4010         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4011         status = PTR_ERR(task);
4012         if (IS_ERR(task))
4013                 goto out;
4014         status = nfs4_wait_for_completion_rpc_task(task);
4015         rpc_put_task(task);
4016 out:
4017         request->fl_flags = fl_flags;
4018         return status;
4019 }
4020
4021 struct nfs4_lockdata {
4022         struct nfs_lock_args arg;
4023         struct nfs_lock_res res;
4024         struct nfs4_lock_state *lsp;
4025         struct nfs_open_context *ctx;
4026         struct file_lock fl;
4027         unsigned long timestamp;
4028         int rpc_status;
4029         int cancelled;
4030         struct nfs_server *server;
4031 };
4032
4033 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4034                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4035                 gfp_t gfp_mask)
4036 {
4037         struct nfs4_lockdata *p;
4038         struct inode *inode = lsp->ls_state->inode;
4039         struct nfs_server *server = NFS_SERVER(inode);
4040
4041         p = kzalloc(sizeof(*p), gfp_mask);
4042         if (p == NULL)
4043                 return NULL;
4044
4045         p->arg.fh = NFS_FH(inode);
4046         p->arg.fl = &p->fl;
4047         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4048         if (p->arg.open_seqid == NULL)
4049                 goto out_free;
4050         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4051         if (p->arg.lock_seqid == NULL)
4052                 goto out_free_seqid;
4053         p->arg.lock_stateid = &lsp->ls_stateid;
4054         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4055         p->arg.lock_owner.id = lsp->ls_id.id;
4056         p->res.lock_seqid = p->arg.lock_seqid;
4057         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4058         p->lsp = lsp;
4059         p->server = server;
4060         atomic_inc(&lsp->ls_count);
4061         p->ctx = get_nfs_open_context(ctx);
4062         memcpy(&p->fl, fl, sizeof(p->fl));
4063         return p;
4064 out_free_seqid:
4065         nfs_free_seqid(p->arg.open_seqid);
4066 out_free:
4067         kfree(p);
4068         return NULL;
4069 }
4070
4071 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4072 {
4073         struct nfs4_lockdata *data = calldata;
4074         struct nfs4_state *state = data->lsp->ls_state;
4075
4076         dprintk("%s: begin!\n", __func__);
4077         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4078                 return;
4079         /* Do we need to do an open_to_lock_owner? */
4080         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4081                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4082                         return;
4083                 data->arg.open_stateid = &state->stateid;
4084                 data->arg.new_lock_owner = 1;
4085                 data->res.open_seqid = data->arg.open_seqid;
4086         } else
4087                 data->arg.new_lock_owner = 0;
4088         data->timestamp = jiffies;
4089         if (nfs4_setup_sequence(data->server,
4090                                 &data->arg.seq_args,
4091                                 &data->res.seq_res, 1, task))
4092                 return;
4093         rpc_call_start(task);
4094         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4095 }
4096
4097 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4098 {
4099         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4100         nfs4_lock_prepare(task, calldata);
4101 }
4102
4103 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4104 {
4105         struct nfs4_lockdata *data = calldata;
4106
4107         dprintk("%s: begin!\n", __func__);
4108
4109         if (!nfs4_sequence_done(task, &data->res.seq_res))
4110                 return;
4111
4112         data->rpc_status = task->tk_status;
4113         if (data->arg.new_lock_owner != 0) {
4114                 if (data->rpc_status == 0)
4115                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4116                 else
4117                         goto out;
4118         }
4119         if (data->rpc_status == 0) {
4120                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4121                                         sizeof(data->lsp->ls_stateid.data));
4122                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4123                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4124         }
4125 out:
4126         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4127 }
4128
4129 static void nfs4_lock_release(void *calldata)
4130 {
4131         struct nfs4_lockdata *data = calldata;
4132
4133         dprintk("%s: begin!\n", __func__);
4134         nfs_free_seqid(data->arg.open_seqid);
4135         if (data->cancelled != 0) {
4136                 struct rpc_task *task;
4137                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4138                                 data->arg.lock_seqid);
4139                 if (!IS_ERR(task))
4140                         rpc_put_task(task);
4141                 dprintk("%s: cancelling lock!\n", __func__);
4142         } else
4143                 nfs_free_seqid(data->arg.lock_seqid);
4144         nfs4_put_lock_state(data->lsp);
4145         put_nfs_open_context(data->ctx);
4146         kfree(data);
4147         dprintk("%s: done!\n", __func__);
4148 }
4149
4150 static const struct rpc_call_ops nfs4_lock_ops = {
4151         .rpc_call_prepare = nfs4_lock_prepare,
4152         .rpc_call_done = nfs4_lock_done,
4153         .rpc_release = nfs4_lock_release,
4154 };
4155
4156 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4157         .rpc_call_prepare = nfs4_recover_lock_prepare,
4158         .rpc_call_done = nfs4_lock_done,
4159         .rpc_release = nfs4_lock_release,
4160 };
4161
4162 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4163 {
4164         struct nfs_client *clp = server->nfs_client;
4165         struct nfs4_state *state = lsp->ls_state;
4166
4167         switch (error) {
4168         case -NFS4ERR_ADMIN_REVOKED:
4169         case -NFS4ERR_BAD_STATEID:
4170         case -NFS4ERR_EXPIRED:
4171                 if (new_lock_owner != 0 ||
4172                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4173                         nfs4_state_mark_reclaim_nograce(clp, state);
4174                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4175                 break;
4176         case -NFS4ERR_STALE_STATEID:
4177                 if (new_lock_owner != 0 ||
4178                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4179                         nfs4_state_mark_reclaim_reboot(clp, state);
4180                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4181         };
4182 }
4183
4184 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4185 {
4186         struct nfs4_lockdata *data;
4187         struct rpc_task *task;
4188         struct rpc_message msg = {
4189                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4190                 .rpc_cred = state->owner->so_cred,
4191         };
4192         struct rpc_task_setup task_setup_data = {
4193                 .rpc_client = NFS_CLIENT(state->inode),
4194                 .rpc_message = &msg,
4195                 .callback_ops = &nfs4_lock_ops,
4196                 .workqueue = nfsiod_workqueue,
4197                 .flags = RPC_TASK_ASYNC,
4198         };
4199         int ret;
4200
4201         dprintk("%s: begin!\n", __func__);
4202         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4203                         fl->fl_u.nfs4_fl.owner,
4204                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4205         if (data == NULL)
4206                 return -ENOMEM;
4207         if (IS_SETLKW(cmd))
4208                 data->arg.block = 1;
4209         if (recovery_type > NFS_LOCK_NEW) {
4210                 if (recovery_type == NFS_LOCK_RECLAIM)
4211                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4212                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4213         }
4214         msg.rpc_argp = &data->arg,
4215         msg.rpc_resp = &data->res,
4216         task_setup_data.callback_data = data;
4217         task = rpc_run_task(&task_setup_data);
4218         if (IS_ERR(task))
4219                 return PTR_ERR(task);
4220         ret = nfs4_wait_for_completion_rpc_task(task);
4221         if (ret == 0) {
4222                 ret = data->rpc_status;
4223                 if (ret)
4224                         nfs4_handle_setlk_error(data->server, data->lsp,
4225                                         data->arg.new_lock_owner, ret);
4226         } else
4227                 data->cancelled = 1;
4228         rpc_put_task(task);
4229         dprintk("%s: done, ret = %d!\n", __func__, ret);
4230         return ret;
4231 }
4232
4233 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4234 {
4235         struct nfs_server *server = NFS_SERVER(state->inode);
4236         struct nfs4_exception exception = { };
4237         int err;
4238
4239         do {
4240                 /* Cache the lock if possible... */
4241                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4242                         return 0;
4243                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4244                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4245                         break;
4246                 nfs4_handle_exception(server, err, &exception);
4247         } while (exception.retry);
4248         return err;
4249 }
4250
4251 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4252 {
4253         struct nfs_server *server = NFS_SERVER(state->inode);
4254         struct nfs4_exception exception = { };
4255         int err;
4256
4257         err = nfs4_set_lock_state(state, request);
4258         if (err != 0)
4259                 return err;
4260         do {
4261                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4262                         return 0;
4263                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4264                 switch (err) {
4265                 default:
4266                         goto out;
4267                 case -NFS4ERR_GRACE:
4268                 case -NFS4ERR_DELAY:
4269                 case -EKEYEXPIRED:
4270                         nfs4_handle_exception(server, err, &exception);
4271                         err = 0;
4272                 }
4273         } while (exception.retry);
4274 out:
4275         return err;
4276 }
4277
4278 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4279 {
4280         struct nfs_inode *nfsi = NFS_I(state->inode);
4281         unsigned char fl_flags = request->fl_flags;
4282         int status = -ENOLCK;
4283
4284         if ((fl_flags & FL_POSIX) &&
4285                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4286                 goto out;
4287         /* Is this a delegated open? */
4288         status = nfs4_set_lock_state(state, request);
4289         if (status != 0)
4290                 goto out;
4291         request->fl_flags |= FL_ACCESS;
4292         status = do_vfs_lock(request->fl_file, request);
4293         if (status < 0)
4294                 goto out;
4295         down_read(&nfsi->rwsem);
4296         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4297                 /* Yes: cache locks! */
4298                 /* ...but avoid races with delegation recall... */
4299                 request->fl_flags = fl_flags & ~FL_SLEEP;
4300                 status = do_vfs_lock(request->fl_file, request);
4301                 goto out_unlock;
4302         }
4303         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4304         if (status != 0)
4305                 goto out_unlock;
4306         /* Note: we always want to sleep here! */
4307         request->fl_flags = fl_flags | FL_SLEEP;
4308         if (do_vfs_lock(request->fl_file, request) < 0)
4309                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4310 out_unlock:
4311         up_read(&nfsi->rwsem);
4312 out:
4313         request->fl_flags = fl_flags;
4314         return status;
4315 }
4316
4317 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4318 {
4319         struct nfs4_exception exception = { };
4320         int err;
4321
4322         do {
4323                 err = _nfs4_proc_setlk(state, cmd, request);
4324                 if (err == -NFS4ERR_DENIED)
4325                         err = -EAGAIN;
4326                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4327                                 err, &exception);
4328         } while (exception.retry);
4329         return err;
4330 }
4331
4332 static int
4333 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4334 {
4335         struct nfs_open_context *ctx;
4336         struct nfs4_state *state;
4337         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4338         int status;
4339
4340         /* verify open state */
4341         ctx = nfs_file_open_context(filp);
4342         state = ctx->state;
4343
4344         if (request->fl_start < 0 || request->fl_end < 0)
4345                 return -EINVAL;
4346
4347         if (IS_GETLK(cmd)) {
4348                 if (state != NULL)
4349                         return nfs4_proc_getlk(state, F_GETLK, request);
4350                 return 0;
4351         }
4352
4353         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4354                 return -EINVAL;
4355
4356         if (request->fl_type == F_UNLCK) {
4357                 if (state != NULL)
4358                         return nfs4_proc_unlck(state, cmd, request);
4359                 return 0;
4360         }
4361
4362         if (state == NULL)
4363                 return -ENOLCK;
4364         do {
4365                 status = nfs4_proc_setlk(state, cmd, request);
4366                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4367                         break;
4368                 timeout = nfs4_set_lock_task_retry(timeout);
4369                 status = -ERESTARTSYS;
4370                 if (signalled())
4371                         break;
4372         } while(status < 0);
4373         return status;
4374 }
4375
4376 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4377 {
4378         struct nfs_server *server = NFS_SERVER(state->inode);
4379         struct nfs4_exception exception = { };
4380         int err;
4381
4382         err = nfs4_set_lock_state(state, fl);
4383         if (err != 0)
4384                 goto out;
4385         do {
4386                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4387                 switch (err) {
4388                         default:
4389                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4390                                                 __func__, err);
4391                         case 0:
4392                         case -ESTALE:
4393                                 goto out;
4394                         case -NFS4ERR_EXPIRED:
4395                         case -NFS4ERR_STALE_CLIENTID:
4396                         case -NFS4ERR_STALE_STATEID:
4397                         case -NFS4ERR_BADSESSION:
4398                         case -NFS4ERR_BADSLOT:
4399                         case -NFS4ERR_BAD_HIGH_SLOT:
4400                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4401                         case -NFS4ERR_DEADSESSION:
4402                                 nfs4_schedule_state_recovery(server->nfs_client);
4403                                 goto out;
4404                         case -ERESTARTSYS:
4405                                 /*
4406                                  * The show must go on: exit, but mark the
4407                                  * stateid as needing recovery.
4408                                  */
4409                         case -NFS4ERR_ADMIN_REVOKED:
4410                         case -NFS4ERR_BAD_STATEID:
4411                         case -NFS4ERR_OPENMODE:
4412                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4413                                 err = 0;
4414                                 goto out;
4415                         case -ENOMEM:
4416                         case -NFS4ERR_DENIED:
4417                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4418                                 err = 0;
4419                                 goto out;
4420                         case -NFS4ERR_DELAY:
4421                         case -EKEYEXPIRED:
4422                                 break;
4423                 }
4424                 err = nfs4_handle_exception(server, err, &exception);
4425         } while (exception.retry);
4426 out:
4427         return err;
4428 }
4429
4430 static void nfs4_release_lockowner_release(void *calldata)
4431 {
4432         kfree(calldata);
4433 }
4434
4435 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4436         .rpc_release = nfs4_release_lockowner_release,
4437 };
4438
4439 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4440 {
4441         struct nfs_server *server = lsp->ls_state->owner->so_server;
4442         struct nfs_release_lockowner_args *args;
4443         struct rpc_message msg = {
4444                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4445         };
4446
4447         if (server->nfs_client->cl_mvops->minor_version != 0)
4448                 return;
4449         args = kmalloc(sizeof(*args), GFP_NOFS);
4450         if (!args)
4451                 return;
4452         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4453         args->lock_owner.id = lsp->ls_id.id;
4454         msg.rpc_argp = args;
4455         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4456 }
4457
4458 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4459
4460 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4461                 size_t buflen, int flags)
4462 {
4463         struct inode *inode = dentry->d_inode;
4464
4465         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4466                 return -EOPNOTSUPP;
4467
4468         return nfs4_proc_set_acl(inode, buf, buflen);
4469 }
4470
4471 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4472  * and that's what we'll do for e.g. user attributes that haven't been set.
4473  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4474  * attributes in kernel-managed attribute namespaces. */
4475 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4476                 size_t buflen)
4477 {
4478         struct inode *inode = dentry->d_inode;
4479
4480         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4481                 return -EOPNOTSUPP;
4482
4483         return nfs4_proc_get_acl(inode, buf, buflen);
4484 }
4485
4486 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4487 {
4488         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4489
4490         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4491                 return 0;
4492         if (buf && buflen < len)
4493                 return -ERANGE;
4494         if (buf)
4495                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4496         return len;
4497 }
4498
4499 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4500 {
4501         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4502                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4503                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4504                 return;
4505
4506         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4507                 NFS_ATTR_FATTR_NLINK;
4508         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4509         fattr->nlink = 2;
4510 }
4511
4512 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4513                 struct nfs4_fs_locations *fs_locations, struct page *page)
4514 {
4515         struct nfs_server *server = NFS_SERVER(dir);
4516         u32 bitmask[2] = {
4517                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4518                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4519         };
4520         struct nfs4_fs_locations_arg args = {
4521                 .dir_fh = NFS_FH(dir),
4522                 .name = name,
4523                 .page = page,
4524                 .bitmask = bitmask,
4525         };
4526         struct nfs4_fs_locations_res res = {
4527                 .fs_locations = fs_locations,
4528         };
4529         struct rpc_message msg = {
4530                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4531                 .rpc_argp = &args,
4532                 .rpc_resp = &res,
4533         };
4534         int status;
4535
4536         dprintk("%s: start\n", __func__);
4537         nfs_fattr_init(&fs_locations->fattr);
4538         fs_locations->server = server;
4539         fs_locations->nlocations = 0;
4540         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4541         nfs_fixup_referral_attributes(&fs_locations->fattr);
4542         dprintk("%s: returned status = %d\n", __func__, status);
4543         return status;
4544 }
4545
4546 #ifdef CONFIG_NFS_V4_1
4547 /*
4548  * nfs4_proc_exchange_id()
4549  *
4550  * Since the clientid has expired, all compounds using sessions
4551  * associated with the stale clientid will be returning
4552  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4553  * be in some phase of session reset.
4554  */
4555 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4556 {
4557         nfs4_verifier verifier;
4558         struct nfs41_exchange_id_args args = {
4559                 .client = clp,
4560                 .flags = clp->cl_exchange_flags,
4561         };
4562         struct nfs41_exchange_id_res res = {
4563                 .client = clp,
4564         };
4565         int status;
4566         struct rpc_message msg = {
4567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4568                 .rpc_argp = &args,
4569                 .rpc_resp = &res,
4570                 .rpc_cred = cred,
4571         };
4572         __be32 *p;
4573
4574         dprintk("--> %s\n", __func__);
4575         BUG_ON(clp == NULL);
4576
4577         /* Remove server-only flags */
4578         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4579
4580         p = (u32 *)verifier.data;
4581         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4582         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4583         args.verifier = &verifier;
4584
4585         while (1) {
4586                 args.id_len = scnprintf(args.id, sizeof(args.id),
4587                                         "%s/%s %u",
4588                                         clp->cl_ipaddr,
4589                                         rpc_peeraddr2str(clp->cl_rpcclient,
4590                                                          RPC_DISPLAY_ADDR),
4591                                         clp->cl_id_uniquifier);
4592
4593                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4594
4595                 if (status != -NFS4ERR_CLID_INUSE)
4596                         break;
4597
4598                 if (signalled())
4599                         break;
4600
4601                 if (++clp->cl_id_uniquifier == 0)
4602                         break;
4603         }
4604
4605         dprintk("<-- %s status= %d\n", __func__, status);
4606         return status;
4607 }
4608
4609 struct nfs4_get_lease_time_data {
4610         struct nfs4_get_lease_time_args *args;
4611         struct nfs4_get_lease_time_res *res;
4612         struct nfs_client *clp;
4613 };
4614
4615 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4616                                         void *calldata)
4617 {
4618         int ret;
4619         struct nfs4_get_lease_time_data *data =
4620                         (struct nfs4_get_lease_time_data *)calldata;
4621
4622         dprintk("--> %s\n", __func__);
4623         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4624         /* just setup sequence, do not trigger session recovery
4625            since we're invoked within one */
4626         ret = nfs41_setup_sequence(data->clp->cl_session,
4627                                    &data->args->la_seq_args,
4628                                    &data->res->lr_seq_res, 0, task);
4629
4630         BUG_ON(ret == -EAGAIN);
4631         rpc_call_start(task);
4632         dprintk("<-- %s\n", __func__);
4633 }
4634
4635 /*
4636  * Called from nfs4_state_manager thread for session setup, so don't recover
4637  * from sequence operation or clientid errors.
4638  */
4639 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4640 {
4641         struct nfs4_get_lease_time_data *data =
4642                         (struct nfs4_get_lease_time_data *)calldata;
4643
4644         dprintk("--> %s\n", __func__);
4645         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4646                 return;
4647         switch (task->tk_status) {
4648         case -NFS4ERR_DELAY:
4649         case -NFS4ERR_GRACE:
4650         case -EKEYEXPIRED:
4651                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4652                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4653                 task->tk_status = 0;
4654                 nfs_restart_rpc(task, data->clp);
4655                 return;
4656         }
4657         dprintk("<-- %s\n", __func__);
4658 }
4659
4660 struct rpc_call_ops nfs4_get_lease_time_ops = {
4661         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4662         .rpc_call_done = nfs4_get_lease_time_done,
4663 };
4664
4665 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4666 {
4667         struct rpc_task *task;
4668         struct nfs4_get_lease_time_args args;
4669         struct nfs4_get_lease_time_res res = {
4670                 .lr_fsinfo = fsinfo,
4671         };
4672         struct nfs4_get_lease_time_data data = {
4673                 .args = &args,
4674                 .res = &res,
4675                 .clp = clp,
4676         };
4677         struct rpc_message msg = {
4678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4679                 .rpc_argp = &args,
4680                 .rpc_resp = &res,
4681         };
4682         struct rpc_task_setup task_setup = {
4683                 .rpc_client = clp->cl_rpcclient,
4684                 .rpc_message = &msg,
4685                 .callback_ops = &nfs4_get_lease_time_ops,
4686                 .callback_data = &data
4687         };
4688         int status;
4689
4690         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4691         dprintk("--> %s\n", __func__);
4692         task = rpc_run_task(&task_setup);
4693
4694         if (IS_ERR(task))
4695                 status = PTR_ERR(task);
4696         else {
4697                 status = task->tk_status;
4698                 rpc_put_task(task);
4699         }
4700         dprintk("<-- %s return %d\n", __func__, status);
4701
4702         return status;
4703 }
4704
4705 /*
4706  * Reset a slot table
4707  */
4708 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4709                                  int ivalue)
4710 {
4711         struct nfs4_slot *new = NULL;
4712         int i;
4713         int ret = 0;
4714
4715         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4716                 max_reqs, tbl->max_slots);
4717
4718         /* Does the newly negotiated max_reqs match the existing slot table? */
4719         if (max_reqs != tbl->max_slots) {
4720                 ret = -ENOMEM;
4721                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4722                               GFP_NOFS);
4723                 if (!new)
4724                         goto out;
4725                 ret = 0;
4726                 kfree(tbl->slots);
4727         }
4728         spin_lock(&tbl->slot_tbl_lock);
4729         if (new) {
4730                 tbl->slots = new;
4731                 tbl->max_slots = max_reqs;
4732         }
4733         for (i = 0; i < tbl->max_slots; ++i)
4734                 tbl->slots[i].seq_nr = ivalue;
4735         spin_unlock(&tbl->slot_tbl_lock);
4736         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4737                 tbl, tbl->slots, tbl->max_slots);
4738 out:
4739         dprintk("<-- %s: return %d\n", __func__, ret);
4740         return ret;
4741 }
4742
4743 /*
4744  * Reset the forechannel and backchannel slot tables
4745  */
4746 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4747 {
4748         int status;
4749
4750         status = nfs4_reset_slot_table(&session->fc_slot_table,
4751                         session->fc_attrs.max_reqs, 1);
4752         if (status)
4753                 return status;
4754
4755         status = nfs4_reset_slot_table(&session->bc_slot_table,
4756                         session->bc_attrs.max_reqs, 0);
4757         return status;
4758 }
4759
4760 /* Destroy the slot table */
4761 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4762 {
4763         if (session->fc_slot_table.slots != NULL) {
4764                 kfree(session->fc_slot_table.slots);
4765                 session->fc_slot_table.slots = NULL;
4766         }
4767         if (session->bc_slot_table.slots != NULL) {
4768                 kfree(session->bc_slot_table.slots);
4769                 session->bc_slot_table.slots = NULL;
4770         }
4771         return;
4772 }
4773
4774 /*
4775  * Initialize slot table
4776  */
4777 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4778                 int max_slots, int ivalue)
4779 {
4780         struct nfs4_slot *slot;
4781         int ret = -ENOMEM;
4782
4783         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4784
4785         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4786
4787         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4788         if (!slot)
4789                 goto out;
4790         ret = 0;
4791
4792         spin_lock(&tbl->slot_tbl_lock);
4793         tbl->max_slots = max_slots;
4794         tbl->slots = slot;
4795         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4796         spin_unlock(&tbl->slot_tbl_lock);
4797         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4798                 tbl, tbl->slots, tbl->max_slots);
4799 out:
4800         dprintk("<-- %s: return %d\n", __func__, ret);
4801         return ret;
4802 }
4803
4804 /*
4805  * Initialize the forechannel and backchannel tables
4806  */
4807 static int nfs4_init_slot_tables(struct nfs4_session *session)
4808 {
4809         struct nfs4_slot_table *tbl;
4810         int status = 0;
4811
4812         tbl = &session->fc_slot_table;
4813         if (tbl->slots == NULL) {
4814                 status = nfs4_init_slot_table(tbl,
4815                                 session->fc_attrs.max_reqs, 1);
4816                 if (status)
4817                         return status;
4818         }
4819
4820         tbl = &session->bc_slot_table;
4821         if (tbl->slots == NULL) {
4822                 status = nfs4_init_slot_table(tbl,
4823                                 session->bc_attrs.max_reqs, 0);
4824                 if (status)
4825                         nfs4_destroy_slot_tables(session);
4826         }
4827
4828         return status;
4829 }
4830
4831 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4832 {
4833         struct nfs4_session *session;
4834         struct nfs4_slot_table *tbl;
4835
4836         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4837         if (!session)
4838                 return NULL;
4839
4840         init_completion(&session->complete);
4841
4842         tbl = &session->fc_slot_table;
4843         tbl->highest_used_slotid = -1;
4844         spin_lock_init(&tbl->slot_tbl_lock);
4845         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4846
4847         tbl = &session->bc_slot_table;
4848         tbl->highest_used_slotid = -1;
4849         spin_lock_init(&tbl->slot_tbl_lock);
4850         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4851
4852         session->session_state = 1<<NFS4_SESSION_INITING;
4853
4854         session->clp = clp;
4855         return session;
4856 }
4857
4858 void nfs4_destroy_session(struct nfs4_session *session)
4859 {
4860         nfs4_proc_destroy_session(session);
4861         dprintk("%s Destroy backchannel for xprt %p\n",
4862                 __func__, session->clp->cl_rpcclient->cl_xprt);
4863         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4864                                 NFS41_BC_MIN_CALLBACKS);
4865         nfs4_destroy_slot_tables(session);
4866         kfree(session);
4867 }
4868
4869 /*
4870  * Initialize the values to be used by the client in CREATE_SESSION
4871  * If nfs4_init_session set the fore channel request and response sizes,
4872  * use them.
4873  *
4874  * Set the back channel max_resp_sz_cached to zero to force the client to
4875  * always set csa_cachethis to FALSE because the current implementation
4876  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4877  */
4878 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4879 {
4880         struct nfs4_session *session = args->client->cl_session;
4881         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4882                      mxresp_sz = session->fc_attrs.max_resp_sz;
4883
4884         if (mxrqst_sz == 0)
4885                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4886         if (mxresp_sz == 0)
4887                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4888         /* Fore channel attributes */
4889         args->fc_attrs.headerpadsz = 0;
4890         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4891         args->fc_attrs.max_resp_sz = mxresp_sz;
4892         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4893         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4894
4895         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4896                 "max_ops=%u max_reqs=%u\n",
4897                 __func__,
4898                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4899                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4900
4901         /* Back channel attributes */
4902         args->bc_attrs.headerpadsz = 0;
4903         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4904         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4905         args->bc_attrs.max_resp_sz_cached = 0;
4906         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4907         args->bc_attrs.max_reqs = 1;
4908
4909         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4910                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4911                 __func__,
4912                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4913                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4914                 args->bc_attrs.max_reqs);
4915 }
4916
4917 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4918 {
4919         if (rcvd <= sent)
4920                 return 0;
4921         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4922                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4923         return -EINVAL;
4924 }
4925
4926 #define _verify_fore_channel_attr(_name_) \
4927         _verify_channel_attr("fore", #_name_, \
4928                              args->fc_attrs._name_, \
4929                              session->fc_attrs._name_)
4930
4931 #define _verify_back_channel_attr(_name_) \
4932         _verify_channel_attr("back", #_name_, \
4933                              args->bc_attrs._name_, \
4934                              session->bc_attrs._name_)
4935
4936 /*
4937  * The server is not allowed to increase the fore channel header pad size,
4938  * maximum response size, or maximum number of operations.
4939  *
4940  * The back channel attributes are only negotiatied down: We send what the
4941  * (back channel) server insists upon.
4942  */
4943 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4944                                      struct nfs4_session *session)
4945 {
4946         int ret = 0;
4947
4948         ret |= _verify_fore_channel_attr(headerpadsz);
4949         ret |= _verify_fore_channel_attr(max_resp_sz);
4950         ret |= _verify_fore_channel_attr(max_ops);
4951
4952         ret |= _verify_back_channel_attr(headerpadsz);
4953         ret |= _verify_back_channel_attr(max_rqst_sz);
4954         ret |= _verify_back_channel_attr(max_resp_sz);
4955         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4956         ret |= _verify_back_channel_attr(max_ops);
4957         ret |= _verify_back_channel_attr(max_reqs);
4958
4959         return ret;
4960 }
4961
4962 static int _nfs4_proc_create_session(struct nfs_client *clp)
4963 {
4964         struct nfs4_session *session = clp->cl_session;
4965         struct nfs41_create_session_args args = {
4966                 .client = clp,
4967                 .cb_program = NFS4_CALLBACK,
4968         };
4969         struct nfs41_create_session_res res = {
4970                 .client = clp,
4971         };
4972         struct rpc_message msg = {
4973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4974                 .rpc_argp = &args,
4975                 .rpc_resp = &res,
4976         };
4977         int status;
4978
4979         nfs4_init_channel_attrs(&args);
4980         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4981
4982         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4983
4984         if (!status)
4985                 /* Verify the session's negotiated channel_attrs values */
4986                 status = nfs4_verify_channel_attrs(&args, session);
4987         if (!status) {
4988                 /* Increment the clientid slot sequence id */
4989                 clp->cl_seqid++;
4990         }
4991
4992         return status;
4993 }
4994
4995 /*
4996  * Issues a CREATE_SESSION operation to the server.
4997  * It is the responsibility of the caller to verify the session is
4998  * expired before calling this routine.
4999  */
5000 int nfs4_proc_create_session(struct nfs_client *clp)
5001 {
5002         int status;
5003         unsigned *ptr;
5004         struct nfs4_session *session = clp->cl_session;
5005
5006         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5007
5008         status = _nfs4_proc_create_session(clp);
5009         if (status)
5010                 goto out;
5011
5012         /* Init and reset the fore channel */
5013         status = nfs4_init_slot_tables(session);
5014         dprintk("slot table initialization returned %d\n", status);
5015         if (status)
5016                 goto out;
5017         status = nfs4_reset_slot_tables(session);
5018         dprintk("slot table reset returned %d\n", status);
5019         if (status)
5020                 goto out;
5021
5022         ptr = (unsigned *)&session->sess_id.data[0];
5023         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5024                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5025 out:
5026         dprintk("<-- %s\n", __func__);
5027         return status;
5028 }
5029
5030 /*
5031  * Issue the over-the-wire RPC DESTROY_SESSION.
5032  * The caller must serialize access to this routine.
5033  */
5034 int nfs4_proc_destroy_session(struct nfs4_session *session)
5035 {
5036         int status = 0;
5037         struct rpc_message msg;
5038
5039         dprintk("--> nfs4_proc_destroy_session\n");
5040
5041         /* session is still being setup */
5042         if (session->clp->cl_cons_state != NFS_CS_READY)
5043                 return status;
5044
5045         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5046         msg.rpc_argp = session;
5047         msg.rpc_resp = NULL;
5048         msg.rpc_cred = NULL;
5049         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5050
5051         if (status)
5052                 printk(KERN_WARNING
5053                         "Got error %d from the server on DESTROY_SESSION. "
5054                         "Session has been destroyed regardless...\n", status);
5055
5056         dprintk("<-- nfs4_proc_destroy_session\n");
5057         return status;
5058 }
5059
5060 int nfs4_init_session(struct nfs_server *server)
5061 {
5062         struct nfs_client *clp = server->nfs_client;
5063         struct nfs4_session *session;
5064         unsigned int rsize, wsize;
5065         int ret;
5066
5067         if (!nfs4_has_session(clp))
5068                 return 0;
5069
5070         session = clp->cl_session;
5071         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5072                 return 0;
5073
5074         rsize = server->rsize;
5075         if (rsize == 0)
5076                 rsize = NFS_MAX_FILE_IO_SIZE;
5077         wsize = server->wsize;
5078         if (wsize == 0)
5079                 wsize = NFS_MAX_FILE_IO_SIZE;
5080
5081         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5082         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5083
5084         ret = nfs4_recover_expired_lease(server);
5085         if (!ret)
5086                 ret = nfs4_check_client_ready(clp);
5087         return ret;
5088 }
5089
5090 /*
5091  * Renew the cl_session lease.
5092  */
5093 struct nfs4_sequence_data {
5094         struct nfs_client *clp;
5095         struct nfs4_sequence_args args;
5096         struct nfs4_sequence_res res;
5097 };
5098
5099 static void nfs41_sequence_release(void *data)
5100 {
5101         struct nfs4_sequence_data *calldata = data;
5102         struct nfs_client *clp = calldata->clp;
5103
5104         if (atomic_read(&clp->cl_count) > 1)
5105                 nfs4_schedule_state_renewal(clp);
5106         nfs_put_client(clp);
5107         kfree(calldata);
5108 }
5109
5110 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5111 {
5112         switch(task->tk_status) {
5113         case -NFS4ERR_DELAY:
5114         case -EKEYEXPIRED:
5115                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5116                 return -EAGAIN;
5117         default:
5118                 nfs4_schedule_state_recovery(clp);
5119         }
5120         return 0;
5121 }
5122
5123 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5124 {
5125         struct nfs4_sequence_data *calldata = data;
5126         struct nfs_client *clp = calldata->clp;
5127
5128         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5129                 return;
5130
5131         if (task->tk_status < 0) {
5132                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5133                 if (atomic_read(&clp->cl_count) == 1)
5134                         goto out;
5135
5136                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5137                         rpc_restart_call_prepare(task);
5138                         return;
5139                 }
5140         }
5141         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5142 out:
5143         dprintk("<-- %s\n", __func__);
5144 }
5145
5146 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5147 {
5148         struct nfs4_sequence_data *calldata = data;
5149         struct nfs_client *clp = calldata->clp;
5150         struct nfs4_sequence_args *args;
5151         struct nfs4_sequence_res *res;
5152
5153         args = task->tk_msg.rpc_argp;
5154         res = task->tk_msg.rpc_resp;
5155
5156         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5157                 return;
5158         rpc_call_start(task);
5159 }
5160
5161 static const struct rpc_call_ops nfs41_sequence_ops = {
5162         .rpc_call_done = nfs41_sequence_call_done,
5163         .rpc_call_prepare = nfs41_sequence_prepare,
5164         .rpc_release = nfs41_sequence_release,
5165 };
5166
5167 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5168 {
5169         struct nfs4_sequence_data *calldata;
5170         struct rpc_message msg = {
5171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5172                 .rpc_cred = cred,
5173         };
5174         struct rpc_task_setup task_setup_data = {
5175                 .rpc_client = clp->cl_rpcclient,
5176                 .rpc_message = &msg,
5177                 .callback_ops = &nfs41_sequence_ops,
5178                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5179         };
5180
5181         if (!atomic_inc_not_zero(&clp->cl_count))
5182                 return ERR_PTR(-EIO);
5183         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5184         if (calldata == NULL) {
5185                 nfs_put_client(clp);
5186                 return ERR_PTR(-ENOMEM);
5187         }
5188         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5189         msg.rpc_argp = &calldata->args;
5190         msg.rpc_resp = &calldata->res;
5191         calldata->clp = clp;
5192         task_setup_data.callback_data = calldata;
5193
5194         return rpc_run_task(&task_setup_data);
5195 }
5196
5197 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5198 {
5199         struct rpc_task *task;
5200         int ret = 0;
5201
5202         task = _nfs41_proc_sequence(clp, cred);
5203         if (IS_ERR(task))
5204                 ret = PTR_ERR(task);
5205         else
5206                 rpc_put_task(task);
5207         dprintk("<-- %s status=%d\n", __func__, ret);
5208         return ret;
5209 }
5210
5211 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5212 {
5213         struct rpc_task *task;
5214         int ret;
5215
5216         task = _nfs41_proc_sequence(clp, cred);
5217         if (IS_ERR(task)) {
5218                 ret = PTR_ERR(task);
5219                 goto out;
5220         }
5221         ret = rpc_wait_for_completion_task(task);
5222         if (!ret)
5223                 ret = task->tk_status;
5224         rpc_put_task(task);
5225 out:
5226         dprintk("<-- %s status=%d\n", __func__, ret);
5227         return ret;
5228 }
5229
5230 struct nfs4_reclaim_complete_data {
5231         struct nfs_client *clp;
5232         struct nfs41_reclaim_complete_args arg;
5233         struct nfs41_reclaim_complete_res res;
5234 };
5235
5236 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5237 {
5238         struct nfs4_reclaim_complete_data *calldata = data;
5239
5240         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5241         if (nfs41_setup_sequence(calldata->clp->cl_session,
5242                                 &calldata->arg.seq_args,
5243                                 &calldata->res.seq_res, 0, task))
5244                 return;
5245
5246         rpc_call_start(task);
5247 }
5248
5249 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5250 {
5251         switch(task->tk_status) {
5252         case 0:
5253         case -NFS4ERR_COMPLETE_ALREADY:
5254         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5255                 break;
5256         case -NFS4ERR_DELAY:
5257         case -EKEYEXPIRED:
5258                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5259                 return -EAGAIN;
5260         default:
5261                 nfs4_schedule_state_recovery(clp);
5262         }
5263         return 0;
5264 }
5265
5266 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5267 {
5268         struct nfs4_reclaim_complete_data *calldata = data;
5269         struct nfs_client *clp = calldata->clp;
5270         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5271
5272         dprintk("--> %s\n", __func__);
5273         if (!nfs41_sequence_done(task, res))
5274                 return;
5275
5276         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5277                 rpc_restart_call_prepare(task);
5278                 return;
5279         }
5280         dprintk("<-- %s\n", __func__);
5281 }
5282
5283 static void nfs4_free_reclaim_complete_data(void *data)
5284 {
5285         struct nfs4_reclaim_complete_data *calldata = data;
5286
5287         kfree(calldata);
5288 }
5289
5290 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5291         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5292         .rpc_call_done = nfs4_reclaim_complete_done,
5293         .rpc_release = nfs4_free_reclaim_complete_data,
5294 };
5295
5296 /*
5297  * Issue a global reclaim complete.
5298  */
5299 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5300 {
5301         struct nfs4_reclaim_complete_data *calldata;
5302         struct rpc_task *task;
5303         struct rpc_message msg = {
5304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5305         };
5306         struct rpc_task_setup task_setup_data = {
5307                 .rpc_client = clp->cl_rpcclient,
5308                 .rpc_message = &msg,
5309                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5310                 .flags = RPC_TASK_ASYNC,
5311         };
5312         int status = -ENOMEM;
5313
5314         dprintk("--> %s\n", __func__);
5315         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5316         if (calldata == NULL)
5317                 goto out;
5318         calldata->clp = clp;
5319         calldata->arg.one_fs = 0;
5320         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5321
5322         msg.rpc_argp = &calldata->arg;
5323         msg.rpc_resp = &calldata->res;
5324         task_setup_data.callback_data = calldata;
5325         task = rpc_run_task(&task_setup_data);
5326         if (IS_ERR(task)) {
5327                 status = PTR_ERR(task);
5328                 goto out;
5329         }
5330         rpc_put_task(task);
5331         return 0;
5332 out:
5333         dprintk("<-- %s status=%d\n", __func__, status);
5334         return status;
5335 }
5336 #endif /* CONFIG_NFS_V4_1 */
5337
5338 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5339         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5340         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5341         .recover_open   = nfs4_open_reclaim,
5342         .recover_lock   = nfs4_lock_reclaim,
5343         .establish_clid = nfs4_init_clientid,
5344         .get_clid_cred  = nfs4_get_setclientid_cred,
5345 };
5346
5347 #if defined(CONFIG_NFS_V4_1)
5348 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5349         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5350         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5351         .recover_open   = nfs4_open_reclaim,
5352         .recover_lock   = nfs4_lock_reclaim,
5353         .establish_clid = nfs41_init_clientid,
5354         .get_clid_cred  = nfs4_get_exchange_id_cred,
5355         .reclaim_complete = nfs41_proc_reclaim_complete,
5356 };
5357 #endif /* CONFIG_NFS_V4_1 */
5358
5359 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5360         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5361         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5362         .recover_open   = nfs4_open_expired,
5363         .recover_lock   = nfs4_lock_expired,
5364         .establish_clid = nfs4_init_clientid,
5365         .get_clid_cred  = nfs4_get_setclientid_cred,
5366 };
5367
5368 #if defined(CONFIG_NFS_V4_1)
5369 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5370         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5371         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5372         .recover_open   = nfs4_open_expired,
5373         .recover_lock   = nfs4_lock_expired,
5374         .establish_clid = nfs41_init_clientid,
5375         .get_clid_cred  = nfs4_get_exchange_id_cred,
5376 };
5377 #endif /* CONFIG_NFS_V4_1 */
5378
5379 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5380         .sched_state_renewal = nfs4_proc_async_renew,
5381         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5382         .renew_lease = nfs4_proc_renew,
5383 };
5384
5385 #if defined(CONFIG_NFS_V4_1)
5386 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5387         .sched_state_renewal = nfs41_proc_async_sequence,
5388         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5389         .renew_lease = nfs4_proc_sequence,
5390 };
5391 #endif
5392
5393 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5394         .minor_version = 0,
5395         .call_sync = _nfs4_call_sync,
5396         .validate_stateid = nfs4_validate_delegation_stateid,
5397         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5398         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5399         .state_renewal_ops = &nfs40_state_renewal_ops,
5400 };
5401
5402 #if defined(CONFIG_NFS_V4_1)
5403 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5404         .minor_version = 1,
5405         .call_sync = _nfs4_call_sync_session,
5406         .validate_stateid = nfs41_validate_delegation_stateid,
5407         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5408         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5409         .state_renewal_ops = &nfs41_state_renewal_ops,
5410 };
5411 #endif
5412
5413 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5414         [0] = &nfs_v4_0_minor_ops,
5415 #if defined(CONFIG_NFS_V4_1)
5416         [1] = &nfs_v4_1_minor_ops,
5417 #endif
5418 };
5419
5420 static const struct inode_operations nfs4_file_inode_operations = {
5421         .permission     = nfs_permission,
5422         .getattr        = nfs_getattr,
5423         .setattr        = nfs_setattr,
5424         .getxattr       = nfs4_getxattr,
5425         .setxattr       = nfs4_setxattr,
5426         .listxattr      = nfs4_listxattr,
5427 };
5428
5429 const struct nfs_rpc_ops nfs_v4_clientops = {
5430         .version        = 4,                    /* protocol version */
5431         .dentry_ops     = &nfs4_dentry_operations,
5432         .dir_inode_ops  = &nfs4_dir_inode_operations,
5433         .file_inode_ops = &nfs4_file_inode_operations,
5434         .getroot        = nfs4_proc_get_root,
5435         .getattr        = nfs4_proc_getattr,
5436         .setattr        = nfs4_proc_setattr,
5437         .lookupfh       = nfs4_proc_lookupfh,
5438         .lookup         = nfs4_proc_lookup,
5439         .access         = nfs4_proc_access,
5440         .readlink       = nfs4_proc_readlink,
5441         .create         = nfs4_proc_create,
5442         .remove         = nfs4_proc_remove,
5443         .unlink_setup   = nfs4_proc_unlink_setup,
5444         .unlink_done    = nfs4_proc_unlink_done,
5445         .rename         = nfs4_proc_rename,
5446         .link           = nfs4_proc_link,
5447         .symlink        = nfs4_proc_symlink,
5448         .mkdir          = nfs4_proc_mkdir,
5449         .rmdir          = nfs4_proc_remove,
5450         .readdir        = nfs4_proc_readdir,
5451         .mknod          = nfs4_proc_mknod,
5452         .statfs         = nfs4_proc_statfs,
5453         .fsinfo         = nfs4_proc_fsinfo,
5454         .pathconf       = nfs4_proc_pathconf,
5455         .set_capabilities = nfs4_server_capabilities,
5456         .decode_dirent  = nfs4_decode_dirent,
5457         .read_setup     = nfs4_proc_read_setup,
5458         .read_done      = nfs4_read_done,
5459         .write_setup    = nfs4_proc_write_setup,
5460         .write_done     = nfs4_write_done,
5461         .commit_setup   = nfs4_proc_commit_setup,
5462         .commit_done    = nfs4_commit_done,
5463         .lock           = nfs4_proc_lock,
5464         .clear_acl_cache = nfs4_zap_acl_attr,
5465         .close_context  = nfs4_close_context,
5466 };
5467
5468 /*
5469  * Local variables:
5470  *  c-basic-offset: 8
5471  * End:
5472  */