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         rpc_restart_call(task);
 450         /* FIXME: rpc_restart_call() should be made to return success/fail */
 451         if (task->tk_action == NULL)
 452                 goto out;
 453         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 454         return 0;
 455 }
 456
 457 static int nfs4_sequence_done(struct rpc_task *task,
 458                                struct nfs4_sequence_res *res)
 459 {
 460         if (res->sr_session == NULL)
 461                 return 1;
 462         return nfs41_sequence_done(task, res);
 463 }
 464
 465 /*
 466  * nfs4_find_slot - efficiently look for a free slot
 467  *
 468  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 469  * If found, we mark the slot as used, update the highest_used_slotid,
 470  * and respectively set up the sequence operation args.
 471  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 472  *
 473  * Note: must be called with under the slot_tbl_lock.
 474  */
 475 static u8
 476 nfs4_find_slot(struct nfs4_slot_table *tbl)
 477 {
 478         int slotid;
 479         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 480         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 481
 482         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 483                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 484                 tbl->max_slots);
 485         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 486         if (slotid >= tbl->max_slots)
 487                 goto out;
 488         __set_bit(slotid, tbl->used_slots);
 489         if (slotid > tbl->highest_used_slotid)
 490                 tbl->highest_used_slotid = slotid;
 491         ret_id = slotid;
 492 out:
 493         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 494                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 495         return ret_id;
 496 }
 497
 498 static int nfs41_setup_sequence(struct nfs4_session *session,
 499                                 struct nfs4_sequence_args *args,
 500                                 struct nfs4_sequence_res *res,
 501                                 int cache_reply,
 502                                 struct rpc_task *task)
 503 {
 504         struct nfs4_slot *slot;
 505         struct nfs4_slot_table *tbl;
 506         u8 slotid;
 507
 508         dprintk("--> %s\n", __func__);
 509         /* slot already allocated? */
 510         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 511                 return 0;
 512
 513         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 514         tbl = &session->fc_slot_table;
 515
 516         spin_lock(&tbl->slot_tbl_lock);
 517         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 518             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 519                 /*
 520                  * The state manager will wait until the slot table is empty.
 521                  * Schedule the reset thread
 522                  */
 523                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 524                 spin_unlock(&tbl->slot_tbl_lock);
 525                 dprintk("%s Schedule Session Reset\n", __func__);
 526                 return -EAGAIN;
 527         }
 528
 529         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 530             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532                 spin_unlock(&tbl->slot_tbl_lock);
 533                 dprintk("%s enforce FIFO order\n", __func__);
 534                 return -EAGAIN;
 535         }
 536
 537         slotid = nfs4_find_slot(tbl);
 538         if (slotid == NFS4_MAX_SLOT_TABLE) {
 539                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 540                 spin_unlock(&tbl->slot_tbl_lock);
 541                 dprintk("<-- %s: no free slots\n", __func__);
 542                 return -EAGAIN;
 543         }
 544         spin_unlock(&tbl->slot_tbl_lock);
 545
 546         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 547         slot = tbl->slots + slotid;
 548         args->sa_session = session;
 549         args->sa_slotid = slotid;
 550         args->sa_cache_this = cache_reply;
 551
 552         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 553
 554         res->sr_session = session;
 555         res->sr_slotid = slotid;
 556         res->sr_renewal_time = jiffies;
 557         res->sr_status_flags = 0;
 558         /*
 559          * sr_status is only set in decode_sequence, and so will remain
 560          * set to 1 if an rpc level failure occurs.
 561          */
 562         res->sr_status = 1;
 563         return 0;
 564 }
 565
 566 int nfs4_setup_sequence(const struct nfs_server *server,
 567                         struct nfs4_sequence_args *args,
 568                         struct nfs4_sequence_res *res,
 569                         int cache_reply,
 570                         struct rpc_task *task)
 571 {
 572         struct nfs4_session *session = nfs4_get_session(server);
 573         int ret = 0;
 574
 575         if (session == NULL) {
 576                 args->sa_session = NULL;
 577                 res->sr_session = NULL;
 578                 goto out;
 579         }
 580
 581         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 582                 __func__, session->clp, session, res->sr_slotid);
 583
 584         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 585                                    task);
 586 out:
 587         dprintk("<-- %s status=%d\n", __func__, ret);
 588         return ret;
 589 }
 590
 591 struct nfs41_call_sync_data {
 592         const struct nfs_server *seq_server;
 593         struct nfs4_sequence_args *seq_args;
 594         struct nfs4_sequence_res *seq_res;
 595         int cache_reply;
 596 };
 597
 598 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 599 {
 600         struct nfs41_call_sync_data *data = calldata;
 601
 602         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 603
 604         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 605                                 data->seq_res, data->cache_reply, task))
 606                 return;
 607         rpc_call_start(task);
 608 }
 609
 610 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 611 {
 612         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 613         nfs41_call_sync_prepare(task, calldata);
 614 }
 615
 616 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 617 {
 618         struct nfs41_call_sync_data *data = calldata;
 619
 620         nfs41_sequence_done(task, data->seq_res);
 621 }
 622
 623 struct rpc_call_ops nfs41_call_sync_ops = {
 624         .rpc_call_prepare = nfs41_call_sync_prepare,
 625         .rpc_call_done = nfs41_call_sync_done,
 626 };
 627
 628 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 629         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 630         .rpc_call_done = nfs41_call_sync_done,
 631 };
 632
 633 static int nfs4_call_sync_sequence(struct nfs_server *server,
 634                                    struct rpc_message *msg,
 635                                    struct nfs4_sequence_args *args,
 636                                    struct nfs4_sequence_res *res,
 637                                    int cache_reply,
 638                                    int privileged)
 639 {
 640         int ret;
 641         struct rpc_task *task;
 642         struct nfs41_call_sync_data data = {
 643                 .seq_server = server,
 644                 .seq_args = args,
 645                 .seq_res = res,
 646                 .cache_reply = cache_reply,
 647         };
 648         struct rpc_task_setup task_setup = {
 649                 .rpc_client = server->client,
 650                 .rpc_message = msg,
 651                 .callback_ops = &nfs41_call_sync_ops,
 652                 .callback_data = &data
 653         };
 654
 655         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 656         if (privileged)
 657                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 658         task = rpc_run_task(&task_setup);
 659         if (IS_ERR(task))
 660                 ret = PTR_ERR(task);
 661         else {
 662                 ret = task->tk_status;
 663                 rpc_put_task(task);
 664         }
 665         return ret;
 666 }
 667
 668 int _nfs4_call_sync_session(struct nfs_server *server,
 669                             struct rpc_message *msg,
 670                             struct nfs4_sequence_args *args,
 671                             struct nfs4_sequence_res *res,
 672                             int cache_reply)
 673 {
 674         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 675 }
 676
 677 #else
 678 static int nfs4_sequence_done(struct rpc_task *task,
 679                                struct nfs4_sequence_res *res)
 680 {
 681         return 1;
 682 }
 683 #endif /* CONFIG_NFS_V4_1 */
 684
 685 int _nfs4_call_sync(struct nfs_server *server,
 686                     struct rpc_message *msg,
 687                     struct nfs4_sequence_args *args,
 688                     struct nfs4_sequence_res *res,
 689                     int cache_reply)
 690 {
 691         args->sa_session = res->sr_session = NULL;
 692         return rpc_call_sync(server->client, msg, 0);
 693 }
 694
 695 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 696         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 697                         &(res)->seq_res, (cache_reply))
 698
 699 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 700 {
 701         struct nfs_inode *nfsi = NFS_I(dir);
 702
 703         spin_lock(&dir->i_lock);
 704         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 705         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 706                 nfs_force_lookup_revalidate(dir);
 707         nfsi->change_attr = cinfo->after;
 708         spin_unlock(&dir->i_lock);
 709 }
 710
 711 struct nfs4_opendata {
 712         struct kref kref;
 713         struct nfs_openargs o_arg;
 714         struct nfs_openres o_res;
 715         struct nfs_open_confirmargs c_arg;
 716         struct nfs_open_confirmres c_res;
 717         struct nfs_fattr f_attr;
 718         struct nfs_fattr dir_attr;
 719         struct path path;
 720         struct dentry *dir;
 721         struct nfs4_state_owner *owner;
 722         struct nfs4_state *state;
 723         struct iattr attrs;
 724         unsigned long timestamp;
 725         unsigned int rpc_done : 1;
 726         int rpc_status;
 727         int cancelled;
 728 };
 729
 730
 731 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 732 {
 733         p->o_res.f_attr = &p->f_attr;
 734         p->o_res.dir_attr = &p->dir_attr;
 735         p->o_res.seqid = p->o_arg.seqid;
 736         p->c_res.seqid = p->c_arg.seqid;
 737         p->o_res.server = p->o_arg.server;
 738         nfs_fattr_init(&p->f_attr);
 739         nfs_fattr_init(&p->dir_attr);
 740         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 741 }
 742
 743 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 744                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 745                 const struct iattr *attrs,
 746                 gfp_t gfp_mask)
 747 {
 748         struct dentry *parent = dget_parent(path->dentry);
 749         struct inode *dir = parent->d_inode;
 750         struct nfs_server *server = NFS_SERVER(dir);
 751         struct nfs4_opendata *p;
 752
 753         p = kzalloc(sizeof(*p), gfp_mask);
 754         if (p == NULL)
 755                 goto err;
 756         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 757         if (p->o_arg.seqid == NULL)
 758                 goto err_free;
 759         path_get(path);
 760         p->path = *path;
 761         p->dir = parent;
 762         p->owner = sp;
 763         atomic_inc(&sp->so_count);
 764         p->o_arg.fh = NFS_FH(dir);
 765         p->o_arg.open_flags = flags;
 766         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 767         p->o_arg.clientid = server->nfs_client->cl_clientid;
 768         p->o_arg.id = sp->so_owner_id.id;
 769         p->o_arg.name = &p->path.dentry->d_name;
 770         p->o_arg.server = server;
 771         p->o_arg.bitmask = server->attr_bitmask;
 772         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 773         if (flags & O_CREAT) {
 774                 u32 *s;
 775
 776                 p->o_arg.u.attrs = &p->attrs;
 777                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 778                 s = (u32 *) p->o_arg.u.verifier.data;
 779                 s[0] = jiffies;
 780                 s[1] = current->pid;
 781         }
 782         p->c_arg.fh = &p->o_res.fh;
 783         p->c_arg.stateid = &p->o_res.stateid;
 784         p->c_arg.seqid = p->o_arg.seqid;
 785         nfs4_init_opendata_res(p);
 786         kref_init(&p->kref);
 787         return p;
 788 err_free:
 789         kfree(p);
 790 err:
 791         dput(parent);
 792         return NULL;
 793 }
 794
 795 static void nfs4_opendata_free(struct kref *kref)
 796 {
 797         struct nfs4_opendata *p = container_of(kref,
 798                         struct nfs4_opendata, kref);
 799
 800         nfs_free_seqid(p->o_arg.seqid);
 801         if (p->state != NULL)
 802                 nfs4_put_open_state(p->state);
 803         nfs4_put_state_owner(p->owner);
 804         dput(p->dir);
 805         path_put(&p->path);
 806         kfree(p);
 807 }
 808
 809 static void nfs4_opendata_put(struct nfs4_opendata *p)
 810 {
 811         if (p != NULL)
 812                 kref_put(&p->kref, nfs4_opendata_free);
 813 }
 814
 815 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 816 {
 817         int ret;
 818
 819         ret = rpc_wait_for_completion_task(task);
 820         return ret;
 821 }
 822
 823 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 824 {
 825         int ret = 0;
 826
 827         if (open_mode & O_EXCL)
 828                 goto out;
 829         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 830                 case FMODE_READ:
 831                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 832                                 && state->n_rdonly != 0;
 833                         break;
 834                 case FMODE_WRITE:
 835                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 836                                 && state->n_wronly != 0;
 837                         break;
 838                 case FMODE_READ|FMODE_WRITE:
 839                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 840                                 && state->n_rdwr != 0;
 841         }
 842 out:
 843         return ret;
 844 }
 845
 846 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 847 {
 848         if ((delegation->type & fmode) != fmode)
 849                 return 0;
 850         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 851                 return 0;
 852         nfs_mark_delegation_referenced(delegation);
 853         return 1;
 854 }
 855
 856 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 857 {
 858         switch (fmode) {
 859                 case FMODE_WRITE:
 860                         state->n_wronly++;
 861                         break;
 862                 case FMODE_READ:
 863                         state->n_rdonly++;
 864                         break;
 865                 case FMODE_READ|FMODE_WRITE:
 866                         state->n_rdwr++;
 867         }
 868         nfs4_state_set_mode_locked(state, state->state | fmode);
 869 }
 870
 871 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 872 {
 873         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 874                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 875         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 876         switch (fmode) {
 877                 case FMODE_READ:
 878                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 879                         break;
 880                 case FMODE_WRITE:
 881                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 882                         break;
 883                 case FMODE_READ|FMODE_WRITE:
 884                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 885         }
 886 }
 887
 888 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 889 {
 890         write_seqlock(&state->seqlock);
 891         nfs_set_open_stateid_locked(state, stateid, fmode);
 892         write_sequnlock(&state->seqlock);
 893 }
 894
 895 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 896 {
 897         /*
 898          * Protect the call to nfs4_state_set_mode_locked and
 899          * serialise the stateid update
 900          */
 901         write_seqlock(&state->seqlock);
 902         if (deleg_stateid != NULL) {
 903                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 904                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 905         }
 906         if (open_stateid != NULL)
 907                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 908         write_sequnlock(&state->seqlock);
 909         spin_lock(&state->owner->so_lock);
 910         update_open_stateflags(state, fmode);
 911         spin_unlock(&state->owner->so_lock);
 912 }
 913
 914 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 915 {
 916         struct nfs_inode *nfsi = NFS_I(state->inode);
 917         struct nfs_delegation *deleg_cur;
 918         int ret = 0;
 919
 920         fmode &= (FMODE_READ|FMODE_WRITE);
 921
 922         rcu_read_lock();
 923         deleg_cur = rcu_dereference(nfsi->delegation);
 924         if (deleg_cur == NULL)
 925                 goto no_delegation;
 926
 927         spin_lock(&deleg_cur->lock);
 928         if (nfsi->delegation != deleg_cur ||
 929             (deleg_cur->type & fmode) != fmode)
 930                 goto no_delegation_unlock;
 931
 932         if (delegation == NULL)
 933                 delegation = &deleg_cur->stateid;
 934         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 935                 goto no_delegation_unlock;
 936
 937         nfs_mark_delegation_referenced(deleg_cur);
 938         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 939         ret = 1;
 940 no_delegation_unlock:
 941         spin_unlock(&deleg_cur->lock);
 942 no_delegation:
 943         rcu_read_unlock();
 944
 945         if (!ret && open_stateid != NULL) {
 946                 __update_open_stateid(state, open_stateid, NULL, fmode);
 947                 ret = 1;
 948         }
 949
 950         return ret;
 951 }
 952
 953
 954 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 955 {
 956         struct nfs_delegation *delegation;
 957
 958         rcu_read_lock();
 959         delegation = rcu_dereference(NFS_I(inode)->delegation);
 960         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 961                 rcu_read_unlock();
 962                 return;
 963         }
 964         rcu_read_unlock();
 965         nfs_inode_return_delegation(inode);
 966 }
 967
 968 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 969 {
 970         struct nfs4_state *state = opendata->state;
 971         struct nfs_inode *nfsi = NFS_I(state->inode);
 972         struct nfs_delegation *delegation;
 973         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 974         fmode_t fmode = opendata->o_arg.fmode;
 975         nfs4_stateid stateid;
 976         int ret = -EAGAIN;
 977
 978         for (;;) {
 979                 if (can_open_cached(state, fmode, open_mode)) {
 980                         spin_lock(&state->owner->so_lock);
 981                         if (can_open_cached(state, fmode, open_mode)) {
 982                                 update_open_stateflags(state, fmode);
 983                                 spin_unlock(&state->owner->so_lock);
 984                                 goto out_return_state;
 985                         }
 986                         spin_unlock(&state->owner->so_lock);
 987                 }
 988                 rcu_read_lock();
 989                 delegation = rcu_dereference(nfsi->delegation);
 990                 if (delegation == NULL ||
 991                     !can_open_delegated(delegation, fmode)) {
 992                         rcu_read_unlock();
 993                         break;
 994                 }
 995                 /* Save the delegation */
 996                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 997                 rcu_read_unlock();
 998                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 999                 if (ret != 0)
1000                         goto out;
1001                 ret = -EAGAIN;
1002
1003                 /* Try to update the stateid using the delegation */
1004                 if (update_open_stateid(state, NULL, &stateid, fmode))
1005                         goto out_return_state;
1006         }
1007 out:
1008         return ERR_PTR(ret);
1009 out_return_state:
1010         atomic_inc(&state->count);
1011         return state;
1012 }
1013
1014 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1015 {
1016         struct inode *inode;
1017         struct nfs4_state *state = NULL;
1018         struct nfs_delegation *delegation;
1019         int ret;
1020
1021         if (!data->rpc_done) {
1022                 state = nfs4_try_open_cached(data);
1023                 goto out;
1024         }
1025
1026         ret = -EAGAIN;
1027         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1028                 goto err;
1029         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1030         ret = PTR_ERR(inode);
1031         if (IS_ERR(inode))
1032                 goto err;
1033         ret = -ENOMEM;
1034         state = nfs4_get_open_state(inode, data->owner);
1035         if (state == NULL)
1036                 goto err_put_inode;
1037         if (data->o_res.delegation_type != 0) {
1038                 int delegation_flags = 0;
1039
1040                 rcu_read_lock();
1041                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1042                 if (delegation)
1043                         delegation_flags = delegation->flags;
1044                 rcu_read_unlock();
1045                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1046                         nfs_inode_set_delegation(state->inode,
1047                                         data->owner->so_cred,
1048                                         &data->o_res);
1049                 else
1050                         nfs_inode_reclaim_delegation(state->inode,
1051                                         data->owner->so_cred,
1052                                         &data->o_res);
1053         }
1054
1055         update_open_stateid(state, &data->o_res.stateid, NULL,
1056                         data->o_arg.fmode);
1057         iput(inode);
1058 out:
1059         return state;
1060 err_put_inode:
1061         iput(inode);
1062 err:
1063         return ERR_PTR(ret);
1064 }
1065
1066 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1067 {
1068         struct nfs_inode *nfsi = NFS_I(state->inode);
1069         struct nfs_open_context *ctx;
1070
1071         spin_lock(&state->inode->i_lock);
1072         list_for_each_entry(ctx, &nfsi->open_files, list) {
1073                 if (ctx->state != state)
1074                         continue;
1075                 get_nfs_open_context(ctx);
1076                 spin_unlock(&state->inode->i_lock);
1077                 return ctx;
1078         }
1079         spin_unlock(&state->inode->i_lock);
1080         return ERR_PTR(-ENOENT);
1081 }
1082
1083 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1084 {
1085         struct nfs4_opendata *opendata;
1086
1087         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1088         if (opendata == NULL)
1089                 return ERR_PTR(-ENOMEM);
1090         opendata->state = state;
1091         atomic_inc(&state->count);
1092         return opendata;
1093 }
1094
1095 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1096 {
1097         struct nfs4_state *newstate;
1098         int ret;
1099
1100         opendata->o_arg.open_flags = 0;
1101         opendata->o_arg.fmode = fmode;
1102         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1103         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1104         nfs4_init_opendata_res(opendata);
1105         ret = _nfs4_recover_proc_open(opendata);
1106         if (ret != 0)
1107                 return ret;
1108         newstate = nfs4_opendata_to_nfs4_state(opendata);
1109         if (IS_ERR(newstate))
1110                 return PTR_ERR(newstate);
1111         nfs4_close_state(&opendata->path, newstate, fmode);
1112         *res = newstate;
1113         return 0;
1114 }
1115
1116 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1117 {
1118         struct nfs4_state *newstate;
1119         int ret;
1120
1121         /* memory barrier prior to reading state->n_* */
1122         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1123         smp_rmb();
1124         if (state->n_rdwr != 0) {
1125                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1126                 if (ret != 0)
1127                         return ret;
1128                 if (newstate != state)
1129                         return -ESTALE;
1130         }
1131         if (state->n_wronly != 0) {
1132                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1133                 if (ret != 0)
1134                         return ret;
1135                 if (newstate != state)
1136                         return -ESTALE;
1137         }
1138         if (state->n_rdonly != 0) {
1139                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1140                 if (ret != 0)
1141                         return ret;
1142                 if (newstate != state)
1143                         return -ESTALE;
1144         }
1145         /*
1146          * We may have performed cached opens for all three recoveries.
1147          * Check if we need to update the current stateid.
1148          */
1149         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1150             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1151                 write_seqlock(&state->seqlock);
1152                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1153                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1154                 write_sequnlock(&state->seqlock);
1155         }
1156         return 0;
1157 }
1158
1159 /*
1160  * OPEN_RECLAIM:
1161  *      reclaim state on the server after a reboot.
1162  */
1163 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1164 {
1165         struct nfs_delegation *delegation;
1166         struct nfs4_opendata *opendata;
1167         fmode_t delegation_type = 0;
1168         int status;
1169
1170         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1171         if (IS_ERR(opendata))
1172                 return PTR_ERR(opendata);
1173         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1174         opendata->o_arg.fh = NFS_FH(state->inode);
1175         rcu_read_lock();
1176         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1177         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1178                 delegation_type = delegation->type;
1179         rcu_read_unlock();
1180         opendata->o_arg.u.delegation_type = delegation_type;
1181         status = nfs4_open_recover(opendata, state);
1182         nfs4_opendata_put(opendata);
1183         return status;
1184 }
1185
1186 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1187 {
1188         struct nfs_server *server = NFS_SERVER(state->inode);
1189         struct nfs4_exception exception = { };
1190         int err;
1191         do {
1192                 err = _nfs4_do_open_reclaim(ctx, state);
1193                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1194                         break;
1195                 nfs4_handle_exception(server, err, &exception);
1196         } while (exception.retry);
1197         return err;
1198 }
1199
1200 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1201 {
1202         struct nfs_open_context *ctx;
1203         int ret;
1204
1205         ctx = nfs4_state_find_open_context(state);
1206         if (IS_ERR(ctx))
1207                 return PTR_ERR(ctx);
1208         ret = nfs4_do_open_reclaim(ctx, state);
1209         put_nfs_open_context(ctx);
1210         return ret;
1211 }
1212
1213 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1214 {
1215         struct nfs4_opendata *opendata;
1216         int ret;
1217
1218         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1219         if (IS_ERR(opendata))
1220                 return PTR_ERR(opendata);
1221         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1222         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1223                         sizeof(opendata->o_arg.u.delegation.data));
1224         ret = nfs4_open_recover(opendata, state);
1225         nfs4_opendata_put(opendata);
1226         return ret;
1227 }
1228
1229 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1230 {
1231         struct nfs4_exception exception = { };
1232         struct nfs_server *server = NFS_SERVER(state->inode);
1233         int err;
1234         do {
1235                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1236                 switch (err) {
1237                         case 0:
1238                         case -ENOENT:
1239                         case -ESTALE:
1240                                 goto out;
1241                         case -NFS4ERR_BADSESSION:
1242                         case -NFS4ERR_BADSLOT:
1243                         case -NFS4ERR_BAD_HIGH_SLOT:
1244                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1245                         case -NFS4ERR_DEADSESSION:
1246                                 nfs4_schedule_state_recovery(
1247                                         server->nfs_client);
1248                                 goto out;
1249                         case -NFS4ERR_STALE_CLIENTID:
1250                         case -NFS4ERR_STALE_STATEID:
1251                         case -NFS4ERR_EXPIRED:
1252                                 /* Don't recall a delegation if it was lost */
1253                                 nfs4_schedule_state_recovery(server->nfs_client);
1254                                 goto out;
1255                         case -ERESTARTSYS:
1256                                 /*
1257                                  * The show must go on: exit, but mark the
1258                                  * stateid as needing recovery.
1259                                  */
1260                         case -NFS4ERR_ADMIN_REVOKED:
1261                         case -NFS4ERR_BAD_STATEID:
1262                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1263                         case -ENOMEM:
1264                                 err = 0;
1265                                 goto out;
1266                 }
1267                 err = nfs4_handle_exception(server, err, &exception);
1268         } while (exception.retry);
1269 out:
1270         return err;
1271 }
1272
1273 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1274 {
1275         struct nfs4_opendata *data = calldata;
1276
1277         data->rpc_status = task->tk_status;
1278         if (data->rpc_status == 0) {
1279                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1280                                 sizeof(data->o_res.stateid.data));
1281                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1282                 renew_lease(data->o_res.server, data->timestamp);
1283                 data->rpc_done = 1;
1284         }
1285 }
1286
1287 static void nfs4_open_confirm_release(void *calldata)
1288 {
1289         struct nfs4_opendata *data = calldata;
1290         struct nfs4_state *state = NULL;
1291
1292         /* If this request hasn't been cancelled, do nothing */
1293         if (data->cancelled == 0)
1294                 goto out_free;
1295         /* In case of error, no cleanup! */
1296         if (!data->rpc_done)
1297                 goto out_free;
1298         state = nfs4_opendata_to_nfs4_state(data);
1299         if (!IS_ERR(state))
1300                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1301 out_free:
1302         nfs4_opendata_put(data);
1303 }
1304
1305 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1306         .rpc_call_done = nfs4_open_confirm_done,
1307         .rpc_release = nfs4_open_confirm_release,
1308 };
1309
1310 /*
1311  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1312  */
1313 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1314 {
1315         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1316         struct rpc_task *task;
1317         struct  rpc_message msg = {
1318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1319                 .rpc_argp = &data->c_arg,
1320                 .rpc_resp = &data->c_res,
1321                 .rpc_cred = data->owner->so_cred,
1322         };
1323         struct rpc_task_setup task_setup_data = {
1324                 .rpc_client = server->client,
1325                 .rpc_message = &msg,
1326                 .callback_ops = &nfs4_open_confirm_ops,
1327                 .callback_data = data,
1328                 .workqueue = nfsiod_workqueue,
1329                 .flags = RPC_TASK_ASYNC,
1330         };
1331         int status;
1332
1333         kref_get(&data->kref);
1334         data->rpc_done = 0;
1335         data->rpc_status = 0;
1336         data->timestamp = jiffies;
1337         task = rpc_run_task(&task_setup_data);
1338         if (IS_ERR(task))
1339                 return PTR_ERR(task);
1340         status = nfs4_wait_for_completion_rpc_task(task);
1341         if (status != 0) {
1342                 data->cancelled = 1;
1343                 smp_wmb();
1344         } else
1345                 status = data->rpc_status;
1346         rpc_put_task(task);
1347         return status;
1348 }
1349
1350 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1351 {
1352         struct nfs4_opendata *data = calldata;
1353         struct nfs4_state_owner *sp = data->owner;
1354
1355         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1356                 return;
1357         /*
1358          * Check if we still need to send an OPEN call, or if we can use
1359          * a delegation instead.
1360          */
1361         if (data->state != NULL) {
1362                 struct nfs_delegation *delegation;
1363
1364                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1365                         goto out_no_action;
1366                 rcu_read_lock();
1367                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1368                 if (delegation != NULL &&
1369                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1370                         rcu_read_unlock();
1371                         goto out_no_action;
1372                 }
1373                 rcu_read_unlock();
1374         }
1375         /* Update sequence id. */
1376         data->o_arg.id = sp->so_owner_id.id;
1377         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1378         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1379                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1380                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1381         }
1382         data->timestamp = jiffies;
1383         if (nfs4_setup_sequence(data->o_arg.server,
1384                                 &data->o_arg.seq_args,
1385                                 &data->o_res.seq_res, 1, task))
1386                 return;
1387         rpc_call_start(task);
1388         return;
1389 out_no_action:
1390         task->tk_action = NULL;
1391
1392 }
1393
1394 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1395 {
1396         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1397         nfs4_open_prepare(task, calldata);
1398 }
1399
1400 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1401 {
1402         struct nfs4_opendata *data = calldata;
1403
1404         data->rpc_status = task->tk_status;
1405
1406         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1407                 return;
1408
1409         if (task->tk_status == 0) {
1410                 switch (data->o_res.f_attr->mode & S_IFMT) {
1411                         case S_IFREG:
1412                                 break;
1413                         case S_IFLNK:
1414                                 data->rpc_status = -ELOOP;
1415                                 break;
1416                         case S_IFDIR:
1417                                 data->rpc_status = -EISDIR;
1418                                 break;
1419                         default:
1420                                 data->rpc_status = -ENOTDIR;
1421                 }
1422                 renew_lease(data->o_res.server, data->timestamp);
1423                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1424                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1425         }
1426         data->rpc_done = 1;
1427 }
1428
1429 static void nfs4_open_release(void *calldata)
1430 {
1431         struct nfs4_opendata *data = calldata;
1432         struct nfs4_state *state = NULL;
1433
1434         /* If this request hasn't been cancelled, do nothing */
1435         if (data->cancelled == 0)
1436                 goto out_free;
1437         /* In case of error, no cleanup! */
1438         if (data->rpc_status != 0 || !data->rpc_done)
1439                 goto out_free;
1440         /* In case we need an open_confirm, no cleanup! */
1441         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1442                 goto out_free;
1443         state = nfs4_opendata_to_nfs4_state(data);
1444         if (!IS_ERR(state))
1445                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1446 out_free:
1447         nfs4_opendata_put(data);
1448 }
1449
1450 static const struct rpc_call_ops nfs4_open_ops = {
1451         .rpc_call_prepare = nfs4_open_prepare,
1452         .rpc_call_done = nfs4_open_done,
1453         .rpc_release = nfs4_open_release,
1454 };
1455
1456 static const struct rpc_call_ops nfs4_recover_open_ops = {
1457         .rpc_call_prepare = nfs4_recover_open_prepare,
1458         .rpc_call_done = nfs4_open_done,
1459         .rpc_release = nfs4_open_release,
1460 };
1461
1462 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1463 {
1464         struct inode *dir = data->dir->d_inode;
1465         struct nfs_server *server = NFS_SERVER(dir);
1466         struct nfs_openargs *o_arg = &data->o_arg;
1467         struct nfs_openres *o_res = &data->o_res;
1468         struct rpc_task *task;
1469         struct rpc_message msg = {
1470                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1471                 .rpc_argp = o_arg,
1472                 .rpc_resp = o_res,
1473                 .rpc_cred = data->owner->so_cred,
1474         };
1475         struct rpc_task_setup task_setup_data = {
1476                 .rpc_client = server->client,
1477                 .rpc_message = &msg,
1478                 .callback_ops = &nfs4_open_ops,
1479                 .callback_data = data,
1480                 .workqueue = nfsiod_workqueue,
1481                 .flags = RPC_TASK_ASYNC,
1482         };
1483         int status;
1484
1485         kref_get(&data->kref);
1486         data->rpc_done = 0;
1487         data->rpc_status = 0;
1488         data->cancelled = 0;
1489         if (isrecover)
1490                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1491         task = rpc_run_task(&task_setup_data);
1492         if (IS_ERR(task))
1493                 return PTR_ERR(task);
1494         status = nfs4_wait_for_completion_rpc_task(task);
1495         if (status != 0) {
1496                 data->cancelled = 1;
1497                 smp_wmb();
1498         } else
1499                 status = data->rpc_status;
1500         rpc_put_task(task);
1501
1502         return status;
1503 }
1504
1505 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1506 {
1507         struct inode *dir = data->dir->d_inode;
1508         struct nfs_openres *o_res = &data->o_res;
1509         int status;
1510
1511         status = nfs4_run_open_task(data, 1);
1512         if (status != 0 || !data->rpc_done)
1513                 return status;
1514
1515         nfs_refresh_inode(dir, o_res->dir_attr);
1516
1517         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1518                 status = _nfs4_proc_open_confirm(data);
1519                 if (status != 0)
1520                         return status;
1521         }
1522
1523         return status;
1524 }
1525
1526 /*
1527  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1528  */
1529 static int _nfs4_proc_open(struct nfs4_opendata *data)
1530 {
1531         struct inode *dir = data->dir->d_inode;
1532         struct nfs_server *server = NFS_SERVER(dir);
1533         struct nfs_openargs *o_arg = &data->o_arg;
1534         struct nfs_openres *o_res = &data->o_res;
1535         int status;
1536
1537         status = nfs4_run_open_task(data, 0);
1538         if (status != 0 || !data->rpc_done)
1539                 return status;
1540
1541         if (o_arg->open_flags & O_CREAT) {
1542                 update_changeattr(dir, &o_res->cinfo);
1543                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1544         } else
1545                 nfs_refresh_inode(dir, o_res->dir_attr);
1546         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1547                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1548         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1549                 status = _nfs4_proc_open_confirm(data);
1550                 if (status != 0)
1551                         return status;
1552         }
1553         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1554                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1555         return 0;
1556 }
1557
1558 static int nfs4_recover_expired_lease(struct nfs_server *server)
1559 {
1560         struct nfs_client *clp = server->nfs_client;
1561         unsigned int loop;
1562         int ret;
1563
1564         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1565                 ret = nfs4_wait_clnt_recover(clp);
1566                 if (ret != 0)
1567                         break;
1568                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1569                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1570                         break;
1571                 nfs4_schedule_state_recovery(clp);
1572                 ret = -EIO;
1573         }
1574         return ret;
1575 }
1576
1577 /*
1578  * OPEN_EXPIRED:
1579  *      reclaim state on the server after a network partition.
1580  *      Assumes caller holds the appropriate lock
1581  */
1582 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1583 {
1584         struct nfs4_opendata *opendata;
1585         int ret;
1586
1587         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1588         if (IS_ERR(opendata))
1589                 return PTR_ERR(opendata);
1590         ret = nfs4_open_recover(opendata, state);
1591         if (ret == -ESTALE)
1592                 d_drop(ctx->path.dentry);
1593         nfs4_opendata_put(opendata);
1594         return ret;
1595 }
1596
1597 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1598 {
1599         struct nfs_server *server = NFS_SERVER(state->inode);
1600         struct nfs4_exception exception = { };
1601         int err;
1602
1603         do {
1604                 err = _nfs4_open_expired(ctx, state);
1605                 switch (err) {
1606                 default:
1607                         goto out;
1608                 case -NFS4ERR_GRACE:
1609                 case -NFS4ERR_DELAY:
1610                 case -EKEYEXPIRED:
1611                         nfs4_handle_exception(server, err, &exception);
1612                         err = 0;
1613                 }
1614         } while (exception.retry);
1615 out:
1616         return err;
1617 }
1618
1619 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1620 {
1621         struct nfs_open_context *ctx;
1622         int ret;
1623
1624         ctx = nfs4_state_find_open_context(state);
1625         if (IS_ERR(ctx))
1626                 return PTR_ERR(ctx);
1627         ret = nfs4_do_open_expired(ctx, state);
1628         put_nfs_open_context(ctx);
1629         return ret;
1630 }
1631
1632 /*
1633  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1634  * fields corresponding to attributes that were used to store the verifier.
1635  * Make sure we clobber those fields in the later setattr call
1636  */
1637 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1638 {
1639         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1640             !(sattr->ia_valid & ATTR_ATIME_SET))
1641                 sattr->ia_valid |= ATTR_ATIME;
1642
1643         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1644             !(sattr->ia_valid & ATTR_MTIME_SET))
1645                 sattr->ia_valid |= ATTR_MTIME;
1646 }
1647
1648 /*
1649  * Returns a referenced nfs4_state
1650  */
1651 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)
1652 {
1653         struct nfs4_state_owner  *sp;
1654         struct nfs4_state     *state = NULL;
1655         struct nfs_server       *server = NFS_SERVER(dir);
1656         struct nfs4_opendata *opendata;
1657         int status;
1658
1659         /* Protect against reboot recovery conflicts */
1660         status = -ENOMEM;
1661         if (!(sp = nfs4_get_state_owner(server, cred))) {
1662                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1663                 goto out_err;
1664         }
1665         status = nfs4_recover_expired_lease(server);
1666         if (status != 0)
1667                 goto err_put_state_owner;
1668         if (path->dentry->d_inode != NULL)
1669                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1670         status = -ENOMEM;
1671         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1672         if (opendata == NULL)
1673                 goto err_put_state_owner;
1674
1675         if (path->dentry->d_inode != NULL)
1676                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1677
1678         status = _nfs4_proc_open(opendata);
1679         if (status != 0)
1680                 goto err_opendata_put;
1681
1682         state = nfs4_opendata_to_nfs4_state(opendata);
1683         status = PTR_ERR(state);
1684         if (IS_ERR(state))
1685                 goto err_opendata_put;
1686         if (server->caps & NFS_CAP_POSIX_LOCK)
1687                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1688
1689         if (opendata->o_arg.open_flags & O_EXCL) {
1690                 nfs4_exclusive_attrset(opendata, sattr);
1691
1692                 nfs_fattr_init(opendata->o_res.f_attr);
1693                 status = nfs4_do_setattr(state->inode, cred,
1694                                 opendata->o_res.f_attr, sattr,
1695                                 state);
1696                 if (status == 0)
1697                         nfs_setattr_update_inode(state->inode, sattr);
1698                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1699         }
1700         nfs4_opendata_put(opendata);
1701         nfs4_put_state_owner(sp);
1702         *res = state;
1703         return 0;
1704 err_opendata_put:
1705         nfs4_opendata_put(opendata);
1706 err_put_state_owner:
1707         nfs4_put_state_owner(sp);
1708 out_err:
1709         *res = NULL;
1710         return status;
1711 }
1712
1713
1714 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)
1715 {
1716         struct nfs4_exception exception = { };
1717         struct nfs4_state *res;
1718         int status;
1719
1720         do {
1721                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1722                 if (status == 0)
1723                         break;
1724                 /* NOTE: BAD_SEQID means the server and client disagree about the
1725                  * book-keeping w.r.t. state-changing operations
1726                  * (OPEN/CLOSE/LOCK/LOCKU...)
1727                  * It is actually a sign of a bug on the client or on the server.
1728                  *
1729                  * If we receive a BAD_SEQID error in the particular case of
1730                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1731                  * have unhashed the old state_owner for us, and that we can
1732                  * therefore safely retry using a new one. We should still warn
1733                  * the user though...
1734                  */
1735                 if (status == -NFS4ERR_BAD_SEQID) {
1736                         printk(KERN_WARNING "NFS: v4 server %s "
1737                                         " returned a bad sequence-id error!\n",
1738                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1739                         exception.retry = 1;
1740                         continue;
1741                 }
1742                 /*
1743                  * BAD_STATEID on OPEN means that the server cancelled our
1744                  * state before it received the OPEN_CONFIRM.
1745                  * Recover by retrying the request as per the discussion
1746                  * on Page 181 of RFC3530.
1747                  */
1748                 if (status == -NFS4ERR_BAD_STATEID) {
1749                         exception.retry = 1;
1750                         continue;
1751                 }
1752                 if (status == -EAGAIN) {
1753                         /* We must have found a delegation */
1754                         exception.retry = 1;
1755                         continue;
1756                 }
1757                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1758                                         status, &exception));
1759         } while (exception.retry);
1760         return res;
1761 }
1762
1763 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1764                             struct nfs_fattr *fattr, struct iattr *sattr,
1765                             struct nfs4_state *state)
1766 {
1767         struct nfs_server *server = NFS_SERVER(inode);
1768         struct nfs_setattrargs  arg = {
1769                 .fh             = NFS_FH(inode),
1770                 .iap            = sattr,
1771                 .server         = server,
1772                 .bitmask = server->attr_bitmask,
1773         };
1774         struct nfs_setattrres  res = {
1775                 .fattr          = fattr,
1776                 .server         = server,
1777         };
1778         struct rpc_message msg = {
1779                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1780                 .rpc_argp       = &arg,
1781                 .rpc_resp       = &res,
1782                 .rpc_cred       = cred,
1783         };
1784         unsigned long timestamp = jiffies;
1785         int status;
1786
1787         nfs_fattr_init(fattr);
1788
1789         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1790                 /* Use that stateid */
1791         } else if (state != NULL) {
1792                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1793         } else
1794                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1795
1796         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1797         if (status == 0 && state != NULL)
1798                 renew_lease(server, timestamp);
1799         return status;
1800 }
1801
1802 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1803                            struct nfs_fattr *fattr, struct iattr *sattr,
1804                            struct nfs4_state *state)
1805 {
1806         struct nfs_server *server = NFS_SERVER(inode);
1807         struct nfs4_exception exception = { };
1808         int err;
1809         do {
1810                 err = nfs4_handle_exception(server,
1811                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1812                                 &exception);
1813         } while (exception.retry);
1814         return err;
1815 }
1816
1817 struct nfs4_closedata {
1818         struct path path;
1819         struct inode *inode;
1820         struct nfs4_state *state;
1821         struct nfs_closeargs arg;
1822         struct nfs_closeres res;
1823         struct nfs_fattr fattr;
1824         unsigned long timestamp;
1825 };
1826
1827 static void nfs4_free_closedata(void *data)
1828 {
1829         struct nfs4_closedata *calldata = data;
1830         struct nfs4_state_owner *sp = calldata->state->owner;
1831
1832         nfs4_put_open_state(calldata->state);
1833         nfs_free_seqid(calldata->arg.seqid);
1834         nfs4_put_state_owner(sp);
1835         path_put(&calldata->path);
1836         kfree(calldata);
1837 }
1838
1839 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1840                 fmode_t fmode)
1841 {
1842         spin_lock(&state->owner->so_lock);
1843         if (!(fmode & FMODE_READ))
1844                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1845         if (!(fmode & FMODE_WRITE))
1846                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1847         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1848         spin_unlock(&state->owner->so_lock);
1849 }
1850
1851 static void nfs4_close_done(struct rpc_task *task, void *data)
1852 {
1853         struct nfs4_closedata *calldata = data;
1854         struct nfs4_state *state = calldata->state;
1855         struct nfs_server *server = NFS_SERVER(calldata->inode);
1856
1857         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1858                 return;
1859         /* hmm. we are done with the inode, and in the process of freeing
1860          * the state_owner. we keep this around to process errors
1861          */
1862         switch (task->tk_status) {
1863                 case 0:
1864                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1865                         renew_lease(server, calldata->timestamp);
1866                         nfs4_close_clear_stateid_flags(state,
1867                                         calldata->arg.fmode);
1868                         break;
1869                 case -NFS4ERR_STALE_STATEID:
1870                 case -NFS4ERR_OLD_STATEID:
1871                 case -NFS4ERR_BAD_STATEID:
1872                 case -NFS4ERR_EXPIRED:
1873                         if (calldata->arg.fmode == 0)
1874                                 break;
1875                 default:
1876                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1877                                 rpc_restart_call_prepare(task);
1878         }
1879         nfs_release_seqid(calldata->arg.seqid);
1880         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1881 }
1882
1883 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1884 {
1885         struct nfs4_closedata *calldata = data;
1886         struct nfs4_state *state = calldata->state;
1887         int call_close = 0;
1888
1889         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1890                 return;
1891
1892         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1893         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1894         spin_lock(&state->owner->so_lock);
1895         /* Calculate the change in open mode */
1896         if (state->n_rdwr == 0) {
1897                 if (state->n_rdonly == 0) {
1898                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1899                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1900                         calldata->arg.fmode &= ~FMODE_READ;
1901                 }
1902                 if (state->n_wronly == 0) {
1903                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1904                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1905                         calldata->arg.fmode &= ~FMODE_WRITE;
1906                 }
1907         }
1908         spin_unlock(&state->owner->so_lock);
1909
1910         if (!call_close) {
1911                 /* Note: exit _without_ calling nfs4_close_done */
1912                 task->tk_action = NULL;
1913                 return;
1914         }
1915
1916         if (calldata->arg.fmode == 0)
1917                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1918
1919         nfs_fattr_init(calldata->res.fattr);
1920         calldata->timestamp = jiffies;
1921         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1922                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1923                                 1, task))
1924                 return;
1925         rpc_call_start(task);
1926 }
1927
1928 static const struct rpc_call_ops nfs4_close_ops = {
1929         .rpc_call_prepare = nfs4_close_prepare,
1930         .rpc_call_done = nfs4_close_done,
1931         .rpc_release = nfs4_free_closedata,
1932 };
1933
1934 /*
1935  * It is possible for data to be read/written from a mem-mapped file
1936  * after the sys_close call (which hits the vfs layer as a flush).
1937  * This means that we can't safely call nfsv4 close on a file until
1938  * the inode is cleared. This in turn means that we are not good
1939  * NFSv4 citizens - we do not indicate to the server to update the file's
1940  * share state even when we are done with one of the three share
1941  * stateid's in the inode.
1942  *
1943  * NOTE: Caller must be holding the sp->so_owner semaphore!
1944  */
1945 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1946 {
1947         struct nfs_server *server = NFS_SERVER(state->inode);
1948         struct nfs4_closedata *calldata;
1949         struct nfs4_state_owner *sp = state->owner;
1950         struct rpc_task *task;
1951         struct rpc_message msg = {
1952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1953                 .rpc_cred = state->owner->so_cred,
1954         };
1955         struct rpc_task_setup task_setup_data = {
1956                 .rpc_client = server->client,
1957                 .rpc_message = &msg,
1958                 .callback_ops = &nfs4_close_ops,
1959                 .workqueue = nfsiod_workqueue,
1960                 .flags = RPC_TASK_ASYNC,
1961         };
1962         int status = -ENOMEM;
1963
1964         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1965         if (calldata == NULL)
1966                 goto out;
1967         calldata->inode = state->inode;
1968         calldata->state = state;
1969         calldata->arg.fh = NFS_FH(state->inode);
1970         calldata->arg.stateid = &state->open_stateid;
1971         /* Serialization for the sequence id */
1972         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1973         if (calldata->arg.seqid == NULL)
1974                 goto out_free_calldata;
1975         calldata->arg.fmode = 0;
1976         calldata->arg.bitmask = server->cache_consistency_bitmask;
1977         calldata->res.fattr = &calldata->fattr;
1978         calldata->res.seqid = calldata->arg.seqid;
1979         calldata->res.server = server;
1980         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1981         path_get(path);
1982         calldata->path = *path;
1983
1984         msg.rpc_argp = &calldata->arg,
1985         msg.rpc_resp = &calldata->res,
1986         task_setup_data.callback_data = calldata;
1987         task = rpc_run_task(&task_setup_data);
1988         if (IS_ERR(task))
1989                 return PTR_ERR(task);
1990         status = 0;
1991         if (wait)
1992                 status = rpc_wait_for_completion_task(task);
1993         rpc_put_task(task);
1994         return status;
1995 out_free_calldata:
1996         kfree(calldata);
1997 out:
1998         nfs4_put_open_state(state);
1999         nfs4_put_state_owner(sp);
2000         return status;
2001 }
2002
2003 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
2004 {
2005         struct file *filp;
2006         int ret;
2007
2008         /* If the open_intent is for execute, we have an extra check to make */
2009         if (fmode & FMODE_EXEC) {
2010                 ret = nfs_may_open(state->inode,
2011                                 state->owner->so_cred,
2012                                 nd->intent.open.flags);
2013                 if (ret < 0)
2014                         goto out_close;
2015         }
2016         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
2017         if (!IS_ERR(filp)) {
2018                 struct nfs_open_context *ctx;
2019                 ctx = nfs_file_open_context(filp);
2020                 ctx->state = state;
2021                 return 0;
2022         }
2023         ret = PTR_ERR(filp);
2024 out_close:
2025         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
2026         return ret;
2027 }
2028
2029 struct dentry *
2030 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2031 {
2032         struct path path = {
2033                 .mnt = nd->path.mnt,
2034                 .dentry = dentry,
2035         };
2036         struct dentry *parent;
2037         struct iattr attr;
2038         struct rpc_cred *cred;
2039         struct nfs4_state *state;
2040         struct dentry *res;
2041         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2042
2043         if (nd->flags & LOOKUP_CREATE) {
2044                 attr.ia_mode = nd->intent.open.create_mode;
2045                 attr.ia_valid = ATTR_MODE;
2046                 if (!IS_POSIXACL(dir))
2047                         attr.ia_mode &= ~current_umask();
2048         } else {
2049                 attr.ia_valid = 0;
2050                 BUG_ON(nd->intent.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, nd->intent.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         if (locations)
2279                 kfree(locations);
2280         return status;
2281 }
2282
2283 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2284 {
2285         struct nfs4_getattr_arg args = {
2286                 .fh = fhandle,
2287                 .bitmask = server->attr_bitmask,
2288         };
2289         struct nfs4_getattr_res res = {
2290                 .fattr = fattr,
2291                 .server = server,
2292         };
2293         struct rpc_message msg = {
2294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2295                 .rpc_argp = &args,
2296                 .rpc_resp = &res,
2297         };
2298
2299         nfs_fattr_init(fattr);
2300         return nfs4_call_sync(server, &msg, &args, &res, 0);
2301 }
2302
2303 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2304 {
2305         struct nfs4_exception exception = { };
2306         int err;
2307         do {
2308                 err = nfs4_handle_exception(server,
2309                                 _nfs4_proc_getattr(server, fhandle, fattr),
2310                                 &exception);
2311         } while (exception.retry);
2312         return err;
2313 }
2314
2315 /*
2316  * The file is not closed if it is opened due to the a request to change
2317  * the size of the file. The open call will not be needed once the
2318  * VFS layer lookup-intents are implemented.
2319  *
2320  * Close is called when the inode is destroyed.
2321  * If we haven't opened the file for O_WRONLY, we
2322  * need to in the size_change case to obtain a stateid.
2323  *
2324  * Got race?
2325  * Because OPEN is always done by name in nfsv4, it is
2326  * possible that we opened a different file by the same
2327  * name.  We can recognize this race condition, but we
2328  * can't do anything about it besides returning an error.
2329  *
2330  * This will be fixed with VFS changes (lookup-intent).
2331  */
2332 static int
2333 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2334                   struct iattr *sattr)
2335 {
2336         struct inode *inode = dentry->d_inode;
2337         struct rpc_cred *cred = NULL;
2338         struct nfs4_state *state = NULL;
2339         int status;
2340
2341         nfs_fattr_init(fattr);
2342
2343         /* Search for an existing open(O_WRITE) file */
2344         if (sattr->ia_valid & ATTR_FILE) {
2345                 struct nfs_open_context *ctx;
2346
2347                 ctx = nfs_file_open_context(sattr->ia_file);
2348                 if (ctx) {
2349                         cred = ctx->cred;
2350                         state = ctx->state;
2351                 }
2352         }
2353
2354         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2355         if (status == 0)
2356                 nfs_setattr_update_inode(inode, sattr);
2357         return status;
2358 }
2359
2360 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2361                 const struct qstr *name, struct nfs_fh *fhandle,
2362                 struct nfs_fattr *fattr)
2363 {
2364         int                    status;
2365         struct nfs4_lookup_arg args = {
2366                 .bitmask = server->attr_bitmask,
2367                 .dir_fh = dirfh,
2368                 .name = name,
2369         };
2370         struct nfs4_lookup_res res = {
2371                 .server = server,
2372                 .fattr = fattr,
2373                 .fh = fhandle,
2374         };
2375         struct rpc_message msg = {
2376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2377                 .rpc_argp = &args,
2378                 .rpc_resp = &res,
2379         };
2380
2381         nfs_fattr_init(fattr);
2382
2383         dprintk("NFS call  lookupfh %s\n", name->name);
2384         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2385         dprintk("NFS reply lookupfh: %d\n", status);
2386         return status;
2387 }
2388
2389 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2390                               struct qstr *name, struct nfs_fh *fhandle,
2391                               struct nfs_fattr *fattr)
2392 {
2393         struct nfs4_exception exception = { };
2394         int err;
2395         do {
2396                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2397                 /* FIXME: !!!! */
2398                 if (err == -NFS4ERR_MOVED) {
2399                         err = -EREMOTE;
2400                         break;
2401                 }
2402                 err = nfs4_handle_exception(server, err, &exception);
2403         } while (exception.retry);
2404         return err;
2405 }
2406
2407 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2408                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2409 {
2410         int status;
2411
2412         dprintk("NFS call  lookup %s\n", name->name);
2413         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2414         if (status == -NFS4ERR_MOVED)
2415                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2416         dprintk("NFS reply lookup: %d\n", status);
2417         return status;
2418 }
2419
2420 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2421 {
2422         struct nfs4_exception exception = { };
2423         int err;
2424         do {
2425                 err = nfs4_handle_exception(NFS_SERVER(dir),
2426                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2427                                 &exception);
2428         } while (exception.retry);
2429         return err;
2430 }
2431
2432 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2433 {
2434         struct nfs_server *server = NFS_SERVER(inode);
2435         struct nfs4_accessargs args = {
2436                 .fh = NFS_FH(inode),
2437                 .bitmask = server->attr_bitmask,
2438         };
2439         struct nfs4_accessres res = {
2440                 .server = server,
2441         };
2442         struct rpc_message msg = {
2443                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2444                 .rpc_argp = &args,
2445                 .rpc_resp = &res,
2446                 .rpc_cred = entry->cred,
2447         };
2448         int mode = entry->mask;
2449         int status;
2450
2451         /*
2452          * Determine which access bits we want to ask for...
2453          */
2454         if (mode & MAY_READ)
2455                 args.access |= NFS4_ACCESS_READ;
2456         if (S_ISDIR(inode->i_mode)) {
2457                 if (mode & MAY_WRITE)
2458                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2459                 if (mode & MAY_EXEC)
2460                         args.access |= NFS4_ACCESS_LOOKUP;
2461         } else {
2462                 if (mode & MAY_WRITE)
2463                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2464                 if (mode & MAY_EXEC)
2465                         args.access |= NFS4_ACCESS_EXECUTE;
2466         }
2467
2468         res.fattr = nfs_alloc_fattr();
2469         if (res.fattr == NULL)
2470                 return -ENOMEM;
2471
2472         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2473         if (!status) {
2474                 entry->mask = 0;
2475                 if (res.access & NFS4_ACCESS_READ)
2476                         entry->mask |= MAY_READ;
2477                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2478                         entry->mask |= MAY_WRITE;
2479                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2480                         entry->mask |= MAY_EXEC;
2481                 nfs_refresh_inode(inode, res.fattr);
2482         }
2483         nfs_free_fattr(res.fattr);
2484         return status;
2485 }
2486
2487 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2488 {
2489         struct nfs4_exception exception = { };
2490         int err;
2491         do {
2492                 err = nfs4_handle_exception(NFS_SERVER(inode),
2493                                 _nfs4_proc_access(inode, entry),
2494                                 &exception);
2495         } while (exception.retry);
2496         return err;
2497 }
2498
2499 /*
2500  * TODO: For the time being, we don't try to get any attributes
2501  * along with any of the zero-copy operations READ, READDIR,
2502  * READLINK, WRITE.
2503  *
2504  * In the case of the first three, we want to put the GETATTR
2505  * after the read-type operation -- this is because it is hard
2506  * to predict the length of a GETATTR response in v4, and thus
2507  * align the READ data correctly.  This means that the GETATTR
2508  * may end up partially falling into the page cache, and we should
2509  * shift it into the 'tail' of the xdr_buf before processing.
2510  * To do this efficiently, we need to know the total length
2511  * of data received, which doesn't seem to be available outside
2512  * of the RPC layer.
2513  *
2514  * In the case of WRITE, we also want to put the GETATTR after
2515  * the operation -- in this case because we want to make sure
2516  * we get the post-operation mtime and size.  This means that
2517  * we can't use xdr_encode_pages() as written: we need a variant
2518  * of it which would leave room in the 'tail' iovec.
2519  *
2520  * Both of these changes to the XDR layer would in fact be quite
2521  * minor, but I decided to leave them for a subsequent patch.
2522  */
2523 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2524                 unsigned int pgbase, unsigned int pglen)
2525 {
2526         struct nfs4_readlink args = {
2527                 .fh       = NFS_FH(inode),
2528                 .pgbase   = pgbase,
2529                 .pglen    = pglen,
2530                 .pages    = &page,
2531         };
2532         struct nfs4_readlink_res res;
2533         struct rpc_message msg = {
2534                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2535                 .rpc_argp = &args,
2536                 .rpc_resp = &res,
2537         };
2538
2539         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2540 }
2541
2542 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2543                 unsigned int pgbase, unsigned int pglen)
2544 {
2545         struct nfs4_exception exception = { };
2546         int err;
2547         do {
2548                 err = nfs4_handle_exception(NFS_SERVER(inode),
2549                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2550                                 &exception);
2551         } while (exception.retry);
2552         return err;
2553 }
2554
2555 /*
2556  * Got race?
2557  * We will need to arrange for the VFS layer to provide an atomic open.
2558  * Until then, this create/open method is prone to inefficiency and race
2559  * conditions due to the lookup, create, and open VFS calls from sys_open()
2560  * placed on the wire.
2561  *
2562  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2563  * The file will be opened again in the subsequent VFS open call
2564  * (nfs4_proc_file_open).
2565  *
2566  * The open for read will just hang around to be used by any process that
2567  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2568  */
2569
2570 static int
2571 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2572                  int flags, struct nameidata *nd)
2573 {
2574         struct path path = {
2575                 .mnt = nd->path.mnt,
2576                 .dentry = dentry,
2577         };
2578         struct nfs4_state *state;
2579         struct rpc_cred *cred;
2580         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2581         int status = 0;
2582
2583         cred = rpc_lookup_cred();
2584         if (IS_ERR(cred)) {
2585                 status = PTR_ERR(cred);
2586                 goto out;
2587         }
2588         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2589         d_drop(dentry);
2590         if (IS_ERR(state)) {
2591                 status = PTR_ERR(state);
2592                 goto out_putcred;
2593         }
2594         d_add(dentry, igrab(state->inode));
2595         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2596         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2597                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2598         else
2599                 nfs4_close_sync(&path, state, fmode);
2600 out_putcred:
2601         put_rpccred(cred);
2602 out:
2603         return status;
2604 }
2605
2606 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2607 {
2608         struct nfs_server *server = NFS_SERVER(dir);
2609         struct nfs_removeargs args = {
2610                 .fh = NFS_FH(dir),
2611                 .name.len = name->len,
2612                 .name.name = name->name,
2613                 .bitmask = server->attr_bitmask,
2614         };
2615         struct nfs_removeres res = {
2616                 .server = server,
2617         };
2618         struct rpc_message msg = {
2619                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2620                 .rpc_argp = &args,
2621                 .rpc_resp = &res,
2622         };
2623         int status = -ENOMEM;
2624
2625         res.dir_attr = nfs_alloc_fattr();
2626         if (res.dir_attr == NULL)
2627                 goto out;
2628
2629         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2630         if (status == 0) {
2631                 update_changeattr(dir, &res.cinfo);
2632                 nfs_post_op_update_inode(dir, res.dir_attr);
2633         }
2634         nfs_free_fattr(res.dir_attr);
2635 out:
2636         return status;
2637 }
2638
2639 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2640 {
2641         struct nfs4_exception exception = { };
2642         int err;
2643         do {
2644                 err = nfs4_handle_exception(NFS_SERVER(dir),
2645                                 _nfs4_proc_remove(dir, name),
2646                                 &exception);
2647         } while (exception.retry);
2648         return err;
2649 }
2650
2651 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2652 {
2653         struct nfs_server *server = NFS_SERVER(dir);
2654         struct nfs_removeargs *args = msg->rpc_argp;
2655         struct nfs_removeres *res = msg->rpc_resp;
2656
2657         args->bitmask = server->cache_consistency_bitmask;
2658         res->server = server;
2659         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2660 }
2661
2662 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2663 {
2664         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2665
2666         if (!nfs4_sequence_done(task, &res->seq_res))
2667                 return 0;
2668         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2669                 return 0;
2670         update_changeattr(dir, &res->cinfo);
2671         nfs_post_op_update_inode(dir, res->dir_attr);
2672         return 1;
2673 }
2674
2675 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2676                 struct inode *new_dir, struct qstr *new_name)
2677 {
2678         struct nfs_server *server = NFS_SERVER(old_dir);
2679         struct nfs4_rename_arg arg = {
2680                 .old_dir = NFS_FH(old_dir),
2681                 .new_dir = NFS_FH(new_dir),
2682                 .old_name = old_name,
2683                 .new_name = new_name,
2684                 .bitmask = server->attr_bitmask,
2685         };
2686         struct nfs4_rename_res res = {
2687                 .server = server,
2688         };
2689         struct rpc_message msg = {
2690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2691                 .rpc_argp = &arg,
2692                 .rpc_resp = &res,
2693         };
2694         int status = -ENOMEM;
2695
2696         res.old_fattr = nfs_alloc_fattr();
2697         res.new_fattr = nfs_alloc_fattr();
2698         if (res.old_fattr == NULL || res.new_fattr == NULL)
2699                 goto out;
2700
2701         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2702         if (!status) {
2703                 update_changeattr(old_dir, &res.old_cinfo);
2704                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2705                 update_changeattr(new_dir, &res.new_cinfo);
2706                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2707         }
2708 out:
2709         nfs_free_fattr(res.new_fattr);
2710         nfs_free_fattr(res.old_fattr);
2711         return status;
2712 }
2713
2714 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2715                 struct inode *new_dir, struct qstr *new_name)
2716 {
2717         struct nfs4_exception exception = { };
2718         int err;
2719         do {
2720                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2721                                 _nfs4_proc_rename(old_dir, old_name,
2722                                         new_dir, new_name),
2723                                 &exception);
2724         } while (exception.retry);
2725         return err;
2726 }
2727
2728 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2729 {
2730         struct nfs_server *server = NFS_SERVER(inode);
2731         struct nfs4_link_arg arg = {
2732                 .fh     = NFS_FH(inode),
2733                 .dir_fh = NFS_FH(dir),
2734                 .name   = name,
2735                 .bitmask = server->attr_bitmask,
2736         };
2737         struct nfs4_link_res res = {
2738                 .server = server,
2739         };
2740         struct rpc_message msg = {
2741                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2742                 .rpc_argp = &arg,
2743                 .rpc_resp = &res,
2744         };
2745         int status = -ENOMEM;
2746
2747         res.fattr = nfs_alloc_fattr();
2748         res.dir_attr = nfs_alloc_fattr();
2749         if (res.fattr == NULL || res.dir_attr == NULL)
2750                 goto out;
2751
2752         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2753         if (!status) {
2754                 update_changeattr(dir, &res.cinfo);
2755                 nfs_post_op_update_inode(dir, res.dir_attr);
2756                 nfs_post_op_update_inode(inode, res.fattr);
2757         }
2758 out:
2759         nfs_free_fattr(res.dir_attr);
2760         nfs_free_fattr(res.fattr);
2761         return status;
2762 }
2763
2764 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2765 {
2766         struct nfs4_exception exception = { };
2767         int err;
2768         do {
2769                 err = nfs4_handle_exception(NFS_SERVER(inode),
2770                                 _nfs4_proc_link(inode, dir, name),
2771                                 &exception);
2772         } while (exception.retry);
2773         return err;
2774 }
2775
2776 struct nfs4_createdata {
2777         struct rpc_message msg;
2778         struct nfs4_create_arg arg;
2779         struct nfs4_create_res res;
2780         struct nfs_fh fh;
2781         struct nfs_fattr fattr;
2782         struct nfs_fattr dir_fattr;
2783 };
2784
2785 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2786                 struct qstr *name, struct iattr *sattr, u32 ftype)
2787 {
2788         struct nfs4_createdata *data;
2789
2790         data = kzalloc(sizeof(*data), GFP_KERNEL);
2791         if (data != NULL) {
2792                 struct nfs_server *server = NFS_SERVER(dir);
2793
2794                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2795                 data->msg.rpc_argp = &data->arg;
2796                 data->msg.rpc_resp = &data->res;
2797                 data->arg.dir_fh = NFS_FH(dir);
2798                 data->arg.server = server;
2799                 data->arg.name = name;
2800                 data->arg.attrs = sattr;
2801                 data->arg.ftype = ftype;
2802                 data->arg.bitmask = server->attr_bitmask;
2803                 data->res.server = server;
2804                 data->res.fh = &data->fh;
2805                 data->res.fattr = &data->fattr;
2806                 data->res.dir_fattr = &data->dir_fattr;
2807                 nfs_fattr_init(data->res.fattr);
2808                 nfs_fattr_init(data->res.dir_fattr);
2809         }
2810         return data;
2811 }
2812
2813 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2814 {
2815         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2816                                     &data->arg, &data->res, 1);
2817         if (status == 0) {
2818                 update_changeattr(dir, &data->res.dir_cinfo);
2819                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2820                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2821         }
2822         return status;
2823 }
2824
2825 static void nfs4_free_createdata(struct nfs4_createdata *data)
2826 {
2827         kfree(data);
2828 }
2829
2830 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2831                 struct page *page, unsigned int len, struct iattr *sattr)
2832 {
2833         struct nfs4_createdata *data;
2834         int status = -ENAMETOOLONG;
2835
2836         if (len > NFS4_MAXPATHLEN)
2837                 goto out;
2838
2839         status = -ENOMEM;
2840         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2841         if (data == NULL)
2842                 goto out;
2843
2844         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2845         data->arg.u.symlink.pages = &page;
2846         data->arg.u.symlink.len = len;
2847
2848         status = nfs4_do_create(dir, dentry, data);
2849
2850         nfs4_free_createdata(data);
2851 out:
2852         return status;
2853 }
2854
2855 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2856                 struct page *page, unsigned int len, struct iattr *sattr)
2857 {
2858         struct nfs4_exception exception = { };
2859         int err;
2860         do {
2861                 err = nfs4_handle_exception(NFS_SERVER(dir),
2862                                 _nfs4_proc_symlink(dir, dentry, page,
2863                                                         len, sattr),
2864                                 &exception);
2865         } while (exception.retry);
2866         return err;
2867 }
2868
2869 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2870                 struct iattr *sattr)
2871 {
2872         struct nfs4_createdata *data;
2873         int status = -ENOMEM;
2874
2875         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2876         if (data == NULL)
2877                 goto out;
2878
2879         status = nfs4_do_create(dir, dentry, data);
2880
2881         nfs4_free_createdata(data);
2882 out:
2883         return status;
2884 }
2885
2886 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2887                 struct iattr *sattr)
2888 {
2889         struct nfs4_exception exception = { };
2890         int err;
2891         do {
2892                 err = nfs4_handle_exception(NFS_SERVER(dir),
2893                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2894                                 &exception);
2895         } while (exception.retry);
2896         return err;
2897 }
2898
2899 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2900                   u64 cookie, struct page *page, unsigned int count, int plus)
2901 {
2902         struct inode            *dir = dentry->d_inode;
2903         struct nfs4_readdir_arg args = {
2904                 .fh = NFS_FH(dir),
2905                 .pages = &page,
2906                 .pgbase = 0,
2907                 .count = count,
2908                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2909         };
2910         struct nfs4_readdir_res res;
2911         struct rpc_message msg = {
2912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2913                 .rpc_argp = &args,
2914                 .rpc_resp = &res,
2915                 .rpc_cred = cred,
2916         };
2917         int                     status;
2918
2919         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2920                         dentry->d_parent->d_name.name,
2921                         dentry->d_name.name,
2922                         (unsigned long long)cookie);
2923         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2924         res.pgbase = args.pgbase;
2925         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2926         if (status == 0)
2927                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2928
2929         nfs_invalidate_atime(dir);
2930
2931         dprintk("%s: returns %d\n", __func__, status);
2932         return status;
2933 }
2934
2935 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2936                   u64 cookie, struct page *page, unsigned int count, int plus)
2937 {
2938         struct nfs4_exception exception = { };
2939         int err;
2940         do {
2941                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2942                                 _nfs4_proc_readdir(dentry, cred, cookie,
2943                                         page, count, plus),
2944                                 &exception);
2945         } while (exception.retry);
2946         return err;
2947 }
2948
2949 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2950                 struct iattr *sattr, dev_t rdev)
2951 {
2952         struct nfs4_createdata *data;
2953         int mode = sattr->ia_mode;
2954         int status = -ENOMEM;
2955
2956         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2957         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2958
2959         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2960         if (data == NULL)
2961                 goto out;
2962
2963         if (S_ISFIFO(mode))
2964                 data->arg.ftype = NF4FIFO;
2965         else if (S_ISBLK(mode)) {
2966                 data->arg.ftype = NF4BLK;
2967                 data->arg.u.device.specdata1 = MAJOR(rdev);
2968                 data->arg.u.device.specdata2 = MINOR(rdev);
2969         }
2970         else if (S_ISCHR(mode)) {
2971                 data->arg.ftype = NF4CHR;
2972                 data->arg.u.device.specdata1 = MAJOR(rdev);
2973                 data->arg.u.device.specdata2 = MINOR(rdev);
2974         }
2975
2976         status = nfs4_do_create(dir, dentry, data);
2977
2978         nfs4_free_createdata(data);
2979 out:
2980         return status;
2981 }
2982
2983 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2984                 struct iattr *sattr, dev_t rdev)
2985 {
2986         struct nfs4_exception exception = { };
2987         int err;
2988         do {
2989                 err = nfs4_handle_exception(NFS_SERVER(dir),
2990                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2991                                 &exception);
2992         } while (exception.retry);
2993         return err;
2994 }
2995
2996 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2997                  struct nfs_fsstat *fsstat)
2998 {
2999         struct nfs4_statfs_arg args = {
3000                 .fh = fhandle,
3001                 .bitmask = server->attr_bitmask,
3002         };
3003         struct nfs4_statfs_res res = {
3004                 .fsstat = fsstat,
3005         };
3006         struct rpc_message msg = {
3007                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3008                 .rpc_argp = &args,
3009                 .rpc_resp = &res,
3010         };
3011
3012         nfs_fattr_init(fsstat->fattr);
3013         return  nfs4_call_sync(server, &msg, &args, &res, 0);
3014 }
3015
3016 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3017 {
3018         struct nfs4_exception exception = { };
3019         int err;
3020         do {
3021                 err = nfs4_handle_exception(server,
3022                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3023                                 &exception);
3024         } while (exception.retry);
3025         return err;
3026 }
3027
3028 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3029                 struct nfs_fsinfo *fsinfo)
3030 {
3031         struct nfs4_fsinfo_arg args = {
3032                 .fh = fhandle,
3033                 .bitmask = server->attr_bitmask,
3034         };
3035         struct nfs4_fsinfo_res res = {
3036                 .fsinfo = fsinfo,
3037         };
3038         struct rpc_message msg = {
3039                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3040                 .rpc_argp = &args,
3041                 .rpc_resp = &res,
3042         };
3043
3044         return nfs4_call_sync(server, &msg, &args, &res, 0);
3045 }
3046
3047 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3048 {
3049         struct nfs4_exception exception = { };
3050         int err;
3051
3052         do {
3053                 err = nfs4_handle_exception(server,
3054                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3055                                 &exception);
3056         } while (exception.retry);
3057         return err;
3058 }
3059
3060 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3061 {
3062         nfs_fattr_init(fsinfo->fattr);
3063         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3064 }
3065
3066 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3067                 struct nfs_pathconf *pathconf)
3068 {
3069         struct nfs4_pathconf_arg args = {
3070                 .fh = fhandle,
3071                 .bitmask = server->attr_bitmask,
3072         };
3073         struct nfs4_pathconf_res res = {
3074                 .pathconf = pathconf,
3075         };
3076         struct rpc_message msg = {
3077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3078                 .rpc_argp = &args,
3079                 .rpc_resp = &res,
3080         };
3081
3082         /* None of the pathconf attributes are mandatory to implement */
3083         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3084                 memset(pathconf, 0, sizeof(*pathconf));
3085                 return 0;
3086         }
3087
3088         nfs_fattr_init(pathconf->fattr);
3089         return nfs4_call_sync(server, &msg, &args, &res, 0);
3090 }
3091
3092 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3093                 struct nfs_pathconf *pathconf)
3094 {
3095         struct nfs4_exception exception = { };
3096         int err;
3097
3098         do {
3099                 err = nfs4_handle_exception(server,
3100                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3101                                 &exception);
3102         } while (exception.retry);
3103         return err;
3104 }
3105
3106 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3107 {
3108         struct nfs_server *server = NFS_SERVER(data->inode);
3109
3110         dprintk("--> %s\n", __func__);
3111
3112         if (!nfs4_sequence_done(task, &data->res.seq_res))
3113                 return -EAGAIN;
3114
3115         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3116                 nfs_restart_rpc(task, server->nfs_client);
3117                 return -EAGAIN;
3118         }
3119
3120         nfs_invalidate_atime(data->inode);
3121         if (task->tk_status > 0)
3122                 renew_lease(server, data->timestamp);
3123         return 0;
3124 }
3125
3126 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3127 {
3128         data->timestamp   = jiffies;
3129         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3130 }
3131
3132 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3133 {
3134         struct inode *inode = data->inode;
3135
3136         if (!nfs4_sequence_done(task, &data->res.seq_res))
3137                 return -EAGAIN;
3138
3139         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3140                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3141                 return -EAGAIN;
3142         }
3143         if (task->tk_status >= 0) {
3144                 renew_lease(NFS_SERVER(inode), data->timestamp);
3145                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3146         }
3147         return 0;
3148 }
3149
3150 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3151 {
3152         struct nfs_server *server = NFS_SERVER(data->inode);
3153
3154         data->args.bitmask = server->cache_consistency_bitmask;
3155         data->res.server = server;
3156         data->timestamp   = jiffies;
3157
3158         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3159 }
3160
3161 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3162 {
3163         struct inode *inode = data->inode;
3164
3165         if (!nfs4_sequence_done(task, &data->res.seq_res))
3166                 return -EAGAIN;
3167
3168         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3169                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3170                 return -EAGAIN;
3171         }
3172         nfs_refresh_inode(inode, data->res.fattr);
3173         return 0;
3174 }
3175
3176 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3177 {
3178         struct nfs_server *server = NFS_SERVER(data->inode);
3179
3180         data->args.bitmask = server->cache_consistency_bitmask;
3181         data->res.server = server;
3182         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3183 }
3184
3185 struct nfs4_renewdata {
3186         struct nfs_client       *client;
3187         unsigned long           timestamp;
3188 };
3189
3190 /*
3191  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3192  * standalone procedure for queueing an asynchronous RENEW.
3193  */
3194 static void nfs4_renew_release(void *calldata)
3195 {
3196         struct nfs4_renewdata *data = calldata;
3197         struct nfs_client *clp = data->client;
3198
3199         if (atomic_read(&clp->cl_count) > 1)
3200                 nfs4_schedule_state_renewal(clp);
3201         nfs_put_client(clp);
3202         kfree(data);
3203 }
3204
3205 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3206 {
3207         struct nfs4_renewdata *data = calldata;
3208         struct nfs_client *clp = data->client;
3209         unsigned long timestamp = data->timestamp;
3210
3211         if (task->tk_status < 0) {
3212                 /* Unless we're shutting down, schedule state recovery! */
3213                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3214                         nfs4_schedule_state_recovery(clp);
3215                 return;
3216         }
3217         do_renew_lease(clp, timestamp);
3218 }
3219
3220 static const struct rpc_call_ops nfs4_renew_ops = {
3221         .rpc_call_done = nfs4_renew_done,
3222         .rpc_release = nfs4_renew_release,
3223 };
3224
3225 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3226 {
3227         struct rpc_message msg = {
3228                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3229                 .rpc_argp       = clp,
3230                 .rpc_cred       = cred,
3231         };
3232         struct nfs4_renewdata *data;
3233
3234         if (!atomic_inc_not_zero(&clp->cl_count))
3235                 return -EIO;
3236         data = kmalloc(sizeof(*data), GFP_KERNEL);
3237         if (data == NULL)
3238                 return -ENOMEM;
3239         data->client = clp;
3240         data->timestamp = jiffies;
3241         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3242                         &nfs4_renew_ops, data);
3243 }
3244
3245 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3246 {
3247         struct rpc_message msg = {
3248                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3249                 .rpc_argp       = clp,
3250                 .rpc_cred       = cred,
3251         };
3252         unsigned long now = jiffies;
3253         int status;
3254
3255         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3256         if (status < 0)
3257                 return status;
3258         do_renew_lease(clp, now);
3259         return 0;
3260 }
3261
3262 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3263 {
3264         return (server->caps & NFS_CAP_ACLS)
3265                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3266                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3267 }
3268
3269 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3270  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3271  * the stack.
3272  */
3273 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3274
3275 static void buf_to_pages(const void *buf, size_t buflen,
3276                 struct page **pages, unsigned int *pgbase)
3277 {
3278         const void *p = buf;
3279
3280         *pgbase = offset_in_page(buf);
3281         p -= *pgbase;
3282         while (p < buf + buflen) {
3283                 *(pages++) = virt_to_page(p);
3284                 p += PAGE_CACHE_SIZE;
3285         }
3286 }
3287
3288 struct nfs4_cached_acl {
3289         int cached;
3290         size_t len;
3291         char data[0];
3292 };
3293
3294 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3295 {
3296         struct nfs_inode *nfsi = NFS_I(inode);
3297
3298         spin_lock(&inode->i_lock);
3299         kfree(nfsi->nfs4_acl);
3300         nfsi->nfs4_acl = acl;
3301         spin_unlock(&inode->i_lock);
3302 }
3303
3304 static void nfs4_zap_acl_attr(struct inode *inode)
3305 {
3306         nfs4_set_cached_acl(inode, NULL);
3307 }
3308
3309 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3310 {
3311         struct nfs_inode *nfsi = NFS_I(inode);
3312         struct nfs4_cached_acl *acl;
3313         int ret = -ENOENT;
3314
3315         spin_lock(&inode->i_lock);
3316         acl = nfsi->nfs4_acl;
3317         if (acl == NULL)
3318                 goto out;
3319         if (buf == NULL) /* user is just asking for length */
3320                 goto out_len;
3321         if (acl->cached == 0)
3322                 goto out;
3323         ret = -ERANGE; /* see getxattr(2) man page */
3324         if (acl->len > buflen)
3325                 goto out;
3326         memcpy(buf, acl->data, acl->len);
3327 out_len:
3328         ret = acl->len;
3329 out:
3330         spin_unlock(&inode->i_lock);
3331         return ret;
3332 }
3333
3334 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3335 {
3336         struct nfs4_cached_acl *acl;
3337
3338         if (buf && acl_len <= PAGE_SIZE) {
3339                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3340                 if (acl == NULL)
3341                         goto out;
3342                 acl->cached = 1;
3343                 memcpy(acl->data, buf, acl_len);
3344         } else {
3345                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3346                 if (acl == NULL)
3347                         goto out;
3348                 acl->cached = 0;
3349         }
3350         acl->len = acl_len;
3351 out:
3352         nfs4_set_cached_acl(inode, acl);
3353 }
3354
3355 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3356 {
3357         struct page *pages[NFS4ACL_MAXPAGES];
3358         struct nfs_getaclargs args = {
3359                 .fh = NFS_FH(inode),
3360                 .acl_pages = pages,
3361                 .acl_len = buflen,
3362         };
3363         struct nfs_getaclres res = {
3364                 .acl_len = buflen,
3365         };
3366         void *resp_buf;
3367         struct rpc_message msg = {
3368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3369                 .rpc_argp = &args,
3370                 .rpc_resp = &res,
3371         };
3372         struct page *localpage = NULL;
3373         int ret;
3374
3375         if (buflen < PAGE_SIZE) {
3376                 /* As long as we're doing a round trip to the server anyway,
3377                  * let's be prepared for a page of acl data. */
3378                 localpage = alloc_page(GFP_KERNEL);
3379                 resp_buf = page_address(localpage);
3380                 if (localpage == NULL)
3381                         return -ENOMEM;
3382                 args.acl_pages[0] = localpage;
3383                 args.acl_pgbase = 0;
3384                 args.acl_len = PAGE_SIZE;
3385         } else {
3386                 resp_buf = buf;
3387                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3388         }
3389         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3390         if (ret)
3391                 goto out_free;
3392         if (res.acl_len > args.acl_len)
3393                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3394         else
3395                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3396         if (buf) {
3397                 ret = -ERANGE;
3398                 if (res.acl_len > buflen)
3399                         goto out_free;
3400                 if (localpage)
3401                         memcpy(buf, resp_buf, res.acl_len);
3402         }
3403         ret = res.acl_len;
3404 out_free:
3405         if (localpage)
3406                 __free_page(localpage);
3407         return ret;
3408 }
3409
3410 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3411 {
3412         struct nfs4_exception exception = { };
3413         ssize_t ret;
3414         do {
3415                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3416                 if (ret >= 0)
3417                         break;
3418                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3419         } while (exception.retry);
3420         return ret;
3421 }
3422
3423 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3424 {
3425         struct nfs_server *server = NFS_SERVER(inode);
3426         int ret;
3427
3428         if (!nfs4_server_supports_acls(server))
3429                 return -EOPNOTSUPP;
3430         ret = nfs_revalidate_inode(server, inode);
3431         if (ret < 0)
3432                 return ret;
3433         ret = nfs4_read_cached_acl(inode, buf, buflen);
3434         if (ret != -ENOENT)
3435                 return ret;
3436         return nfs4_get_acl_uncached(inode, buf, buflen);
3437 }
3438
3439 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3440 {
3441         struct nfs_server *server = NFS_SERVER(inode);
3442         struct page *pages[NFS4ACL_MAXPAGES];
3443         struct nfs_setaclargs arg = {
3444                 .fh             = NFS_FH(inode),
3445                 .acl_pages      = pages,
3446                 .acl_len        = buflen,
3447         };
3448         struct nfs_setaclres res;
3449         struct rpc_message msg = {
3450                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3451                 .rpc_argp       = &arg,
3452                 .rpc_resp       = &res,
3453         };
3454         int ret;
3455
3456         if (!nfs4_server_supports_acls(server))
3457                 return -EOPNOTSUPP;
3458         nfs_inode_return_delegation(inode);
3459         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3460         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3461         nfs_access_zap_cache(inode);
3462         nfs_zap_acl_cache(inode);
3463         return ret;
3464 }
3465
3466 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3467 {
3468         struct nfs4_exception exception = { };
3469         int err;
3470         do {
3471                 err = nfs4_handle_exception(NFS_SERVER(inode),
3472                                 __nfs4_proc_set_acl(inode, buf, buflen),
3473                                 &exception);
3474         } while (exception.retry);
3475         return err;
3476 }
3477
3478 static int
3479 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3480 {
3481         struct nfs_client *clp = server->nfs_client;
3482
3483         if (task->tk_status >= 0)
3484                 return 0;
3485         switch(task->tk_status) {
3486                 case -NFS4ERR_ADMIN_REVOKED:
3487                 case -NFS4ERR_BAD_STATEID:
3488                 case -NFS4ERR_OPENMODE:
3489                         if (state == NULL)
3490                                 break;
3491                         nfs4_state_mark_reclaim_nograce(clp, state);
3492                         goto do_state_recovery;
3493                 case -NFS4ERR_STALE_STATEID:
3494                         if (state == NULL)
3495                                 break;
3496                         nfs4_state_mark_reclaim_reboot(clp, state);
3497                 case -NFS4ERR_STALE_CLIENTID:
3498                 case -NFS4ERR_EXPIRED:
3499                         goto do_state_recovery;
3500 #if defined(CONFIG_NFS_V4_1)
3501                 case -NFS4ERR_BADSESSION:
3502                 case -NFS4ERR_BADSLOT:
3503                 case -NFS4ERR_BAD_HIGH_SLOT:
3504                 case -NFS4ERR_DEADSESSION:
3505                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3506                 case -NFS4ERR_SEQ_FALSE_RETRY:
3507                 case -NFS4ERR_SEQ_MISORDERED:
3508                         dprintk("%s ERROR %d, Reset session\n", __func__,
3509                                 task->tk_status);
3510                         nfs4_schedule_state_recovery(clp);
3511                         task->tk_status = 0;
3512                         return -EAGAIN;
3513 #endif /* CONFIG_NFS_V4_1 */
3514                 case -NFS4ERR_DELAY:
3515                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3516                 case -NFS4ERR_GRACE:
3517                 case -EKEYEXPIRED:
3518                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3519                         task->tk_status = 0;
3520                         return -EAGAIN;
3521                 case -NFS4ERR_OLD_STATEID:
3522                         task->tk_status = 0;
3523                         return -EAGAIN;
3524         }
3525         task->tk_status = nfs4_map_errors(task->tk_status);
3526         return 0;
3527 do_state_recovery:
3528         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3529         nfs4_schedule_state_recovery(clp);
3530         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3531                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3532         task->tk_status = 0;
3533         return -EAGAIN;
3534 }
3535
3536 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3537                 unsigned short port, struct rpc_cred *cred,
3538                 struct nfs4_setclientid_res *res)
3539 {
3540         nfs4_verifier sc_verifier;
3541         struct nfs4_setclientid setclientid = {
3542                 .sc_verifier = &sc_verifier,
3543                 .sc_prog = program,
3544         };
3545         struct rpc_message msg = {
3546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3547                 .rpc_argp = &setclientid,
3548                 .rpc_resp = res,
3549                 .rpc_cred = cred,
3550         };
3551         __be32 *p;
3552         int loop = 0;
3553         int status;
3554
3555         p = (__be32*)sc_verifier.data;
3556         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3557         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3558
3559         for(;;) {
3560                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3561                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3562                                 clp->cl_ipaddr,
3563                                 rpc_peeraddr2str(clp->cl_rpcclient,
3564                                                         RPC_DISPLAY_ADDR),
3565                                 rpc_peeraddr2str(clp->cl_rpcclient,
3566                                                         RPC_DISPLAY_PROTO),
3567                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3568                                 clp->cl_id_uniquifier);
3569                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3570                                 sizeof(setclientid.sc_netid),
3571                                 rpc_peeraddr2str(clp->cl_rpcclient,
3572                                                         RPC_DISPLAY_NETID));
3573                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3574                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3575                                 clp->cl_ipaddr, port >> 8, port & 255);
3576
3577                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3578                 if (status != -NFS4ERR_CLID_INUSE)
3579                         break;
3580                 if (signalled())
3581                         break;
3582                 if (loop++ & 1)
3583                         ssleep(clp->cl_lease_time + 1);
3584                 else
3585                         if (++clp->cl_id_uniquifier == 0)
3586                                 break;
3587         }
3588         return status;
3589 }
3590
3591 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3592                 struct nfs4_setclientid_res *arg,
3593                 struct rpc_cred *cred)
3594 {
3595         struct nfs_fsinfo fsinfo;
3596         struct rpc_message msg = {
3597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3598                 .rpc_argp = arg,
3599                 .rpc_resp = &fsinfo,
3600                 .rpc_cred = cred,
3601         };
3602         unsigned long now;
3603         int status;
3604
3605         now = jiffies;
3606         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3607         if (status == 0) {
3608                 spin_lock(&clp->cl_lock);
3609                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3610                 clp->cl_last_renewal = now;
3611                 spin_unlock(&clp->cl_lock);
3612         }
3613         return status;
3614 }
3615
3616 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3617                 struct nfs4_setclientid_res *arg,
3618                 struct rpc_cred *cred)
3619 {
3620         long timeout = 0;
3621         int err;
3622         do {
3623                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3624                 switch (err) {
3625                         case 0:
3626                                 return err;
3627                         case -NFS4ERR_RESOURCE:
3628                                 /* The IBM lawyers misread another document! */
3629                         case -NFS4ERR_DELAY:
3630                         case -EKEYEXPIRED:
3631                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3632                 }
3633         } while (err == 0);
3634         return err;
3635 }
3636
3637 struct nfs4_delegreturndata {
3638         struct nfs4_delegreturnargs args;
3639         struct nfs4_delegreturnres res;
3640         struct nfs_fh fh;
3641         nfs4_stateid stateid;
3642         unsigned long timestamp;
3643         struct nfs_fattr fattr;
3644         int rpc_status;
3645 };
3646
3647 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3648 {
3649         struct nfs4_delegreturndata *data = calldata;
3650
3651         if (!nfs4_sequence_done(task, &data->res.seq_res))
3652                 return;
3653
3654         switch (task->tk_status) {
3655         case -NFS4ERR_STALE_STATEID:
3656         case -NFS4ERR_EXPIRED:
3657         case 0:
3658                 renew_lease(data->res.server, data->timestamp);
3659                 break;
3660         default:
3661                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3662                                 -EAGAIN) {
3663                         nfs_restart_rpc(task, data->res.server->nfs_client);
3664                         return;
3665                 }
3666         }
3667         data->rpc_status = task->tk_status;
3668 }
3669
3670 static void nfs4_delegreturn_release(void *calldata)
3671 {
3672         kfree(calldata);
3673 }
3674
3675 #if defined(CONFIG_NFS_V4_1)
3676 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3677 {
3678         struct nfs4_delegreturndata *d_data;
3679
3680         d_data = (struct nfs4_delegreturndata *)data;
3681
3682         if (nfs4_setup_sequence(d_data->res.server,
3683                                 &d_data->args.seq_args,
3684                                 &d_data->res.seq_res, 1, task))
3685                 return;
3686         rpc_call_start(task);
3687 }
3688 #endif /* CONFIG_NFS_V4_1 */
3689
3690 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3691 #if defined(CONFIG_NFS_V4_1)
3692         .rpc_call_prepare = nfs4_delegreturn_prepare,
3693 #endif /* CONFIG_NFS_V4_1 */
3694         .rpc_call_done = nfs4_delegreturn_done,
3695         .rpc_release = nfs4_delegreturn_release,
3696 };
3697
3698 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3699 {
3700         struct nfs4_delegreturndata *data;
3701         struct nfs_server *server = NFS_SERVER(inode);
3702         struct rpc_task *task;
3703         struct rpc_message msg = {
3704                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3705                 .rpc_cred = cred,
3706         };
3707         struct rpc_task_setup task_setup_data = {
3708                 .rpc_client = server->client,
3709                 .rpc_message = &msg,
3710                 .callback_ops = &nfs4_delegreturn_ops,
3711                 .flags = RPC_TASK_ASYNC,
3712         };
3713         int status = 0;
3714
3715         data = kzalloc(sizeof(*data), GFP_NOFS);
3716         if (data == NULL)
3717                 return -ENOMEM;
3718         data->args.fhandle = &data->fh;
3719         data->args.stateid = &data->stateid;
3720         data->args.bitmask = server->attr_bitmask;
3721         nfs_copy_fh(&data->fh, NFS_FH(inode));
3722         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3723         data->res.fattr = &data->fattr;
3724         data->res.server = server;
3725         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3726         nfs_fattr_init(data->res.fattr);
3727         data->timestamp = jiffies;
3728         data->rpc_status = 0;
3729
3730         task_setup_data.callback_data = data;
3731         msg.rpc_argp = &data->args,
3732         msg.rpc_resp = &data->res,
3733         task = rpc_run_task(&task_setup_data);
3734         if (IS_ERR(task))
3735                 return PTR_ERR(task);
3736         if (!issync)
3737                 goto out;
3738         status = nfs4_wait_for_completion_rpc_task(task);
3739         if (status != 0)
3740                 goto out;
3741         status = data->rpc_status;
3742         if (status != 0)
3743                 goto out;
3744         nfs_refresh_inode(inode, &data->fattr);
3745 out:
3746         rpc_put_task(task);
3747         return status;
3748 }
3749
3750 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3751 {
3752         struct nfs_server *server = NFS_SERVER(inode);
3753         struct nfs4_exception exception = { };
3754         int err;
3755         do {
3756                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3757                 switch (err) {
3758                         case -NFS4ERR_STALE_STATEID:
3759                         case -NFS4ERR_EXPIRED:
3760                         case 0:
3761                                 return 0;
3762                 }
3763                 err = nfs4_handle_exception(server, err, &exception);
3764         } while (exception.retry);
3765         return err;
3766 }
3767
3768 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3769 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3770
3771 /*
3772  * sleep, with exponential backoff, and retry the LOCK operation.
3773  */
3774 static unsigned long
3775 nfs4_set_lock_task_retry(unsigned long timeout)
3776 {
3777         schedule_timeout_killable(timeout);
3778         timeout <<= 1;
3779         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3780                 return NFS4_LOCK_MAXTIMEOUT;
3781         return timeout;
3782 }
3783
3784 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3785 {
3786         struct inode *inode = state->inode;
3787         struct nfs_server *server = NFS_SERVER(inode);
3788         struct nfs_client *clp = server->nfs_client;
3789         struct nfs_lockt_args arg = {
3790                 .fh = NFS_FH(inode),
3791                 .fl = request,
3792         };
3793         struct nfs_lockt_res res = {
3794                 .denied = request,
3795         };
3796         struct rpc_message msg = {
3797                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3798                 .rpc_argp       = &arg,
3799                 .rpc_resp       = &res,
3800                 .rpc_cred       = state->owner->so_cred,
3801         };
3802         struct nfs4_lock_state *lsp;
3803         int status;
3804
3805         arg.lock_owner.clientid = clp->cl_clientid;
3806         status = nfs4_set_lock_state(state, request);
3807         if (status != 0)
3808                 goto out;
3809         lsp = request->fl_u.nfs4_fl.owner;
3810         arg.lock_owner.id = lsp->ls_id.id;
3811         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3812         switch (status) {
3813                 case 0:
3814                         request->fl_type = F_UNLCK;
3815                         break;
3816                 case -NFS4ERR_DENIED:
3817                         status = 0;
3818         }
3819         request->fl_ops->fl_release_private(request);
3820 out:
3821         return status;
3822 }
3823
3824 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3825 {
3826         struct nfs4_exception exception = { };
3827         int err;
3828
3829         do {
3830                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3831                                 _nfs4_proc_getlk(state, cmd, request),
3832                                 &exception);
3833         } while (exception.retry);
3834         return err;
3835 }
3836
3837 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3838 {
3839         int res = 0;
3840         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3841                 case FL_POSIX:
3842                         res = posix_lock_file_wait(file, fl);
3843                         break;
3844                 case FL_FLOCK:
3845                         res = flock_lock_file_wait(file, fl);
3846                         break;
3847                 default:
3848                         BUG();
3849         }
3850         return res;
3851 }
3852
3853 struct nfs4_unlockdata {
3854         struct nfs_locku_args arg;
3855         struct nfs_locku_res res;
3856         struct nfs4_lock_state *lsp;
3857         struct nfs_open_context *ctx;
3858         struct file_lock fl;
3859         const struct nfs_server *server;
3860         unsigned long timestamp;
3861 };
3862
3863 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3864                 struct nfs_open_context *ctx,
3865                 struct nfs4_lock_state *lsp,
3866                 struct nfs_seqid *seqid)
3867 {
3868         struct nfs4_unlockdata *p;
3869         struct inode *inode = lsp->ls_state->inode;
3870
3871         p = kzalloc(sizeof(*p), GFP_NOFS);
3872         if (p == NULL)
3873                 return NULL;
3874         p->arg.fh = NFS_FH(inode);
3875         p->arg.fl = &p->fl;
3876         p->arg.seqid = seqid;
3877         p->res.seqid = seqid;
3878         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3879         p->arg.stateid = &lsp->ls_stateid;
3880         p->lsp = lsp;
3881         atomic_inc(&lsp->ls_count);
3882         /* Ensure we don't close file until we're done freeing locks! */
3883         p->ctx = get_nfs_open_context(ctx);
3884         memcpy(&p->fl, fl, sizeof(p->fl));
3885         p->server = NFS_SERVER(inode);
3886         return p;
3887 }
3888
3889 static void nfs4_locku_release_calldata(void *data)
3890 {
3891         struct nfs4_unlockdata *calldata = data;
3892         nfs_free_seqid(calldata->arg.seqid);
3893         nfs4_put_lock_state(calldata->lsp);
3894         put_nfs_open_context(calldata->ctx);
3895         kfree(calldata);
3896 }
3897
3898 static void nfs4_locku_done(struct rpc_task *task, void *data)
3899 {
3900         struct nfs4_unlockdata *calldata = data;
3901
3902         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3903                 return;
3904         switch (task->tk_status) {
3905                 case 0:
3906                         memcpy(calldata->lsp->ls_stateid.data,
3907                                         calldata->res.stateid.data,
3908                                         sizeof(calldata->lsp->ls_stateid.data));
3909                         renew_lease(calldata->server, calldata->timestamp);
3910                         break;
3911                 case -NFS4ERR_BAD_STATEID:
3912                 case -NFS4ERR_OLD_STATEID:
3913                 case -NFS4ERR_STALE_STATEID:
3914                 case -NFS4ERR_EXPIRED:
3915                         break;
3916                 default:
3917                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3918                                 nfs_restart_rpc(task,
3919                                                  calldata->server->nfs_client);
3920         }
3921 }
3922
3923 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3924 {
3925         struct nfs4_unlockdata *calldata = data;
3926
3927         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3928                 return;
3929         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3930                 /* Note: exit _without_ running nfs4_locku_done */
3931                 task->tk_action = NULL;
3932                 return;
3933         }
3934         calldata->timestamp = jiffies;
3935         if (nfs4_setup_sequence(calldata->server,
3936                                 &calldata->arg.seq_args,
3937                                 &calldata->res.seq_res, 1, task))
3938                 return;
3939         rpc_call_start(task);
3940 }
3941
3942 static const struct rpc_call_ops nfs4_locku_ops = {
3943         .rpc_call_prepare = nfs4_locku_prepare,
3944         .rpc_call_done = nfs4_locku_done,
3945         .rpc_release = nfs4_locku_release_calldata,
3946 };
3947
3948 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3949                 struct nfs_open_context *ctx,
3950                 struct nfs4_lock_state *lsp,
3951                 struct nfs_seqid *seqid)
3952 {
3953         struct nfs4_unlockdata *data;
3954         struct rpc_message msg = {
3955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3956                 .rpc_cred = ctx->cred,
3957         };
3958         struct rpc_task_setup task_setup_data = {
3959                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3960                 .rpc_message = &msg,
3961                 .callback_ops = &nfs4_locku_ops,
3962                 .workqueue = nfsiod_workqueue,
3963                 .flags = RPC_TASK_ASYNC,
3964         };
3965
3966         /* Ensure this is an unlock - when canceling a lock, the
3967          * canceled lock is passed in, and it won't be an unlock.
3968          */
3969         fl->fl_type = F_UNLCK;
3970
3971         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3972         if (data == NULL) {
3973                 nfs_free_seqid(seqid);
3974                 return ERR_PTR(-ENOMEM);
3975         }
3976
3977         msg.rpc_argp = &data->arg,
3978         msg.rpc_resp = &data->res,
3979         task_setup_data.callback_data = data;
3980         return rpc_run_task(&task_setup_data);
3981 }
3982
3983 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3984 {
3985         struct nfs_inode *nfsi = NFS_I(state->inode);
3986         struct nfs_seqid *seqid;
3987         struct nfs4_lock_state *lsp;
3988         struct rpc_task *task;
3989         int status = 0;
3990         unsigned char fl_flags = request->fl_flags;
3991
3992         status = nfs4_set_lock_state(state, request);
3993         /* Unlock _before_ we do the RPC call */
3994         request->fl_flags |= FL_EXISTS;
3995         down_read(&nfsi->rwsem);
3996         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3997                 up_read(&nfsi->rwsem);
3998                 goto out;
3999         }
4000         up_read(&nfsi->rwsem);
4001         if (status != 0)
4002                 goto out;
4003         /* Is this a delegated lock? */
4004         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4005                 goto out;
4006         lsp = request->fl_u.nfs4_fl.owner;
4007         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4008         status = -ENOMEM;
4009         if (seqid == NULL)
4010                 goto out;
4011         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4012         status = PTR_ERR(task);
4013         if (IS_ERR(task))
4014                 goto out;
4015         status = nfs4_wait_for_completion_rpc_task(task);
4016         rpc_put_task(task);
4017 out:
4018         request->fl_flags = fl_flags;
4019         return status;
4020 }
4021
4022 struct nfs4_lockdata {
4023         struct nfs_lock_args arg;
4024         struct nfs_lock_res res;
4025         struct nfs4_lock_state *lsp;
4026         struct nfs_open_context *ctx;
4027         struct file_lock fl;
4028         unsigned long timestamp;
4029         int rpc_status;
4030         int cancelled;
4031         struct nfs_server *server;
4032 };
4033
4034 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4035                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4036                 gfp_t gfp_mask)
4037 {
4038         struct nfs4_lockdata *p;
4039         struct inode *inode = lsp->ls_state->inode;
4040         struct nfs_server *server = NFS_SERVER(inode);
4041
4042         p = kzalloc(sizeof(*p), gfp_mask);
4043         if (p == NULL)
4044                 return NULL;
4045
4046         p->arg.fh = NFS_FH(inode);
4047         p->arg.fl = &p->fl;
4048         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4049         if (p->arg.open_seqid == NULL)
4050                 goto out_free;
4051         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4052         if (p->arg.lock_seqid == NULL)
4053                 goto out_free_seqid;
4054         p->arg.lock_stateid = &lsp->ls_stateid;
4055         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4056         p->arg.lock_owner.id = lsp->ls_id.id;
4057         p->res.lock_seqid = p->arg.lock_seqid;
4058         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4059         p->lsp = lsp;
4060         p->server = server;
4061         atomic_inc(&lsp->ls_count);
4062         p->ctx = get_nfs_open_context(ctx);
4063         memcpy(&p->fl, fl, sizeof(p->fl));
4064         return p;
4065 out_free_seqid:
4066         nfs_free_seqid(p->arg.open_seqid);
4067 out_free:
4068         kfree(p);
4069         return NULL;
4070 }
4071
4072 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4073 {
4074         struct nfs4_lockdata *data = calldata;
4075         struct nfs4_state *state = data->lsp->ls_state;
4076
4077         dprintk("%s: begin!\n", __func__);
4078         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4079                 return;
4080         /* Do we need to do an open_to_lock_owner? */
4081         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4082                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4083                         return;
4084                 data->arg.open_stateid = &state->stateid;
4085                 data->arg.new_lock_owner = 1;
4086                 data->res.open_seqid = data->arg.open_seqid;
4087         } else
4088                 data->arg.new_lock_owner = 0;
4089         data->timestamp = jiffies;
4090         if (nfs4_setup_sequence(data->server,
4091                                 &data->arg.seq_args,
4092                                 &data->res.seq_res, 1, task))
4093                 return;
4094         rpc_call_start(task);
4095         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4096 }
4097
4098 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4099 {
4100         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4101         nfs4_lock_prepare(task, calldata);
4102 }
4103
4104 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4105 {
4106         struct nfs4_lockdata *data = calldata;
4107
4108         dprintk("%s: begin!\n", __func__);
4109
4110         if (!nfs4_sequence_done(task, &data->res.seq_res))
4111                 return;
4112
4113         data->rpc_status = task->tk_status;
4114         if (data->arg.new_lock_owner != 0) {
4115                 if (data->rpc_status == 0)
4116                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4117                 else
4118                         goto out;
4119         }
4120         if (data->rpc_status == 0) {
4121                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4122                                         sizeof(data->lsp->ls_stateid.data));
4123                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4124                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4125         }
4126 out:
4127         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4128 }
4129
4130 static void nfs4_lock_release(void *calldata)
4131 {
4132         struct nfs4_lockdata *data = calldata;
4133
4134         dprintk("%s: begin!\n", __func__);
4135         nfs_free_seqid(data->arg.open_seqid);
4136         if (data->cancelled != 0) {
4137                 struct rpc_task *task;
4138                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4139                                 data->arg.lock_seqid);
4140                 if (!IS_ERR(task))
4141                         rpc_put_task(task);
4142                 dprintk("%s: cancelling lock!\n", __func__);
4143         } else
4144                 nfs_free_seqid(data->arg.lock_seqid);
4145         nfs4_put_lock_state(data->lsp);
4146         put_nfs_open_context(data->ctx);
4147         kfree(data);
4148         dprintk("%s: done!\n", __func__);
4149 }
4150
4151 static const struct rpc_call_ops nfs4_lock_ops = {
4152         .rpc_call_prepare = nfs4_lock_prepare,
4153         .rpc_call_done = nfs4_lock_done,
4154         .rpc_release = nfs4_lock_release,
4155 };
4156
4157 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4158         .rpc_call_prepare = nfs4_recover_lock_prepare,
4159         .rpc_call_done = nfs4_lock_done,
4160         .rpc_release = nfs4_lock_release,
4161 };
4162
4163 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4164 {
4165         struct nfs_client *clp = server->nfs_client;
4166         struct nfs4_state *state = lsp->ls_state;
4167
4168         switch (error) {
4169         case -NFS4ERR_ADMIN_REVOKED:
4170         case -NFS4ERR_BAD_STATEID:
4171         case -NFS4ERR_EXPIRED:
4172                 if (new_lock_owner != 0 ||
4173                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4174                         nfs4_state_mark_reclaim_nograce(clp, state);
4175                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4176                 break;
4177         case -NFS4ERR_STALE_STATEID:
4178                 if (new_lock_owner != 0 ||
4179                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4180                         nfs4_state_mark_reclaim_reboot(clp, state);
4181                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4182         };
4183 }
4184
4185 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4186 {
4187         struct nfs4_lockdata *data;
4188         struct rpc_task *task;
4189         struct rpc_message msg = {
4190                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4191                 .rpc_cred = state->owner->so_cred,
4192         };
4193         struct rpc_task_setup task_setup_data = {
4194                 .rpc_client = NFS_CLIENT(state->inode),
4195                 .rpc_message = &msg,
4196                 .callback_ops = &nfs4_lock_ops,
4197                 .workqueue = nfsiod_workqueue,
4198                 .flags = RPC_TASK_ASYNC,
4199         };
4200         int ret;
4201
4202         dprintk("%s: begin!\n", __func__);
4203         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4204                         fl->fl_u.nfs4_fl.owner,
4205                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4206         if (data == NULL)
4207                 return -ENOMEM;
4208         if (IS_SETLKW(cmd))
4209                 data->arg.block = 1;
4210         if (recovery_type > NFS_LOCK_NEW) {
4211                 if (recovery_type == NFS_LOCK_RECLAIM)
4212                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4213                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4214         }
4215         msg.rpc_argp = &data->arg,
4216         msg.rpc_resp = &data->res,
4217         task_setup_data.callback_data = data;
4218         task = rpc_run_task(&task_setup_data);
4219         if (IS_ERR(task))
4220                 return PTR_ERR(task);
4221         ret = nfs4_wait_for_completion_rpc_task(task);
4222         if (ret == 0) {
4223                 ret = data->rpc_status;
4224                 if (ret)
4225                         nfs4_handle_setlk_error(data->server, data->lsp,
4226                                         data->arg.new_lock_owner, ret);
4227         } else
4228                 data->cancelled = 1;
4229         rpc_put_task(task);
4230         dprintk("%s: done, ret = %d!\n", __func__, ret);
4231         return ret;
4232 }
4233
4234 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4235 {
4236         struct nfs_server *server = NFS_SERVER(state->inode);
4237         struct nfs4_exception exception = { };
4238         int err;
4239
4240         do {
4241                 /* Cache the lock if possible... */
4242                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4243                         return 0;
4244                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4245                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4246                         break;
4247                 nfs4_handle_exception(server, err, &exception);
4248         } while (exception.retry);
4249         return err;
4250 }
4251
4252 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4253 {
4254         struct nfs_server *server = NFS_SERVER(state->inode);
4255         struct nfs4_exception exception = { };
4256         int err;
4257
4258         err = nfs4_set_lock_state(state, request);
4259         if (err != 0)
4260                 return err;
4261         do {
4262                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4263                         return 0;
4264                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4265                 switch (err) {
4266                 default:
4267                         goto out;
4268                 case -NFS4ERR_GRACE:
4269                 case -NFS4ERR_DELAY:
4270                 case -EKEYEXPIRED:
4271                         nfs4_handle_exception(server, err, &exception);
4272                         err = 0;
4273                 }
4274         } while (exception.retry);
4275 out:
4276         return err;
4277 }
4278
4279 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4280 {
4281         struct nfs_inode *nfsi = NFS_I(state->inode);
4282         unsigned char fl_flags = request->fl_flags;
4283         int status = -ENOLCK;
4284
4285         if ((fl_flags & FL_POSIX) &&
4286                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4287                 goto out;
4288         /* Is this a delegated open? */
4289         status = nfs4_set_lock_state(state, request);
4290         if (status != 0)
4291                 goto out;
4292         request->fl_flags |= FL_ACCESS;
4293         status = do_vfs_lock(request->fl_file, request);
4294         if (status < 0)
4295                 goto out;
4296         down_read(&nfsi->rwsem);
4297         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4298                 /* Yes: cache locks! */
4299                 /* ...but avoid races with delegation recall... */
4300                 request->fl_flags = fl_flags & ~FL_SLEEP;
4301                 status = do_vfs_lock(request->fl_file, request);
4302                 goto out_unlock;
4303         }
4304         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4305         if (status != 0)
4306                 goto out_unlock;
4307         /* Note: we always want to sleep here! */
4308         request->fl_flags = fl_flags | FL_SLEEP;
4309         if (do_vfs_lock(request->fl_file, request) < 0)
4310                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4311 out_unlock:
4312         up_read(&nfsi->rwsem);
4313 out:
4314         request->fl_flags = fl_flags;
4315         return status;
4316 }
4317
4318 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4319 {
4320         struct nfs4_exception exception = { };
4321         int err;
4322
4323         do {
4324                 err = _nfs4_proc_setlk(state, cmd, request);
4325                 if (err == -NFS4ERR_DENIED)
4326                         err = -EAGAIN;
4327                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4328                                 err, &exception);
4329         } while (exception.retry);
4330         return err;
4331 }
4332
4333 static int
4334 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4335 {
4336         struct nfs_open_context *ctx;
4337         struct nfs4_state *state;
4338         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4339         int status;
4340
4341         /* verify open state */
4342         ctx = nfs_file_open_context(filp);
4343         state = ctx->state;
4344
4345         if (request->fl_start < 0 || request->fl_end < 0)
4346                 return -EINVAL;
4347
4348         if (IS_GETLK(cmd)) {
4349                 if (state != NULL)
4350                         return nfs4_proc_getlk(state, F_GETLK, request);
4351                 return 0;
4352         }
4353
4354         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4355                 return -EINVAL;
4356
4357         if (request->fl_type == F_UNLCK) {
4358                 if (state != NULL)
4359                         return nfs4_proc_unlck(state, cmd, request);
4360                 return 0;
4361         }
4362
4363         if (state == NULL)
4364                 return -ENOLCK;
4365         do {
4366                 status = nfs4_proc_setlk(state, cmd, request);
4367                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4368                         break;
4369                 timeout = nfs4_set_lock_task_retry(timeout);
4370                 status = -ERESTARTSYS;
4371                 if (signalled())
4372                         break;
4373         } while(status < 0);
4374         return status;
4375 }
4376
4377 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4378 {
4379         struct nfs_server *server = NFS_SERVER(state->inode);
4380         struct nfs4_exception exception = { };
4381         int err;
4382
4383         err = nfs4_set_lock_state(state, fl);
4384         if (err != 0)
4385                 goto out;
4386         do {
4387                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4388                 switch (err) {
4389                         default:
4390                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4391                                                 __func__, err);
4392                         case 0:
4393                         case -ESTALE:
4394                                 goto out;
4395                         case -NFS4ERR_EXPIRED:
4396                         case -NFS4ERR_STALE_CLIENTID:
4397                         case -NFS4ERR_STALE_STATEID:
4398                         case -NFS4ERR_BADSESSION:
4399                         case -NFS4ERR_BADSLOT:
4400                         case -NFS4ERR_BAD_HIGH_SLOT:
4401                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4402                         case -NFS4ERR_DEADSESSION:
4403                                 nfs4_schedule_state_recovery(server->nfs_client);
4404                                 goto out;
4405                         case -ERESTARTSYS:
4406                                 /*
4407                                  * The show must go on: exit, but mark the
4408                                  * stateid as needing recovery.
4409                                  */
4410                         case -NFS4ERR_ADMIN_REVOKED:
4411                         case -NFS4ERR_BAD_STATEID:
4412                         case -NFS4ERR_OPENMODE:
4413                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4414                                 err = 0;
4415                                 goto out;
4416                         case -ENOMEM:
4417                         case -NFS4ERR_DENIED:
4418                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4419                                 err = 0;
4420                                 goto out;
4421                         case -NFS4ERR_DELAY:
4422                         case -EKEYEXPIRED:
4423                                 break;
4424                 }
4425                 err = nfs4_handle_exception(server, err, &exception);
4426         } while (exception.retry);
4427 out:
4428         return err;
4429 }
4430
4431 static void nfs4_release_lockowner_release(void *calldata)
4432 {
4433         kfree(calldata);
4434 }
4435
4436 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4437         .rpc_release = nfs4_release_lockowner_release,
4438 };
4439
4440 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4441 {
4442         struct nfs_server *server = lsp->ls_state->owner->so_server;
4443         struct nfs_release_lockowner_args *args;
4444         struct rpc_message msg = {
4445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4446         };
4447
4448         if (server->nfs_client->cl_mvops->minor_version != 0)
4449                 return;
4450         args = kmalloc(sizeof(*args), GFP_NOFS);
4451         if (!args)
4452                 return;
4453         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4454         args->lock_owner.id = lsp->ls_id.id;
4455         msg.rpc_argp = args;
4456         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4457 }
4458
4459 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4460
4461 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4462                 size_t buflen, int flags)
4463 {
4464         struct inode *inode = dentry->d_inode;
4465
4466         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4467                 return -EOPNOTSUPP;
4468
4469         return nfs4_proc_set_acl(inode, buf, buflen);
4470 }
4471
4472 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4473  * and that's what we'll do for e.g. user attributes that haven't been set.
4474  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4475  * attributes in kernel-managed attribute namespaces. */
4476 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4477                 size_t buflen)
4478 {
4479         struct inode *inode = dentry->d_inode;
4480
4481         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4482                 return -EOPNOTSUPP;
4483
4484         return nfs4_proc_get_acl(inode, buf, buflen);
4485 }
4486
4487 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4488 {
4489         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4490
4491         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4492                 return 0;
4493         if (buf && buflen < len)
4494                 return -ERANGE;
4495         if (buf)
4496                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4497         return len;
4498 }
4499
4500 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4501 {
4502         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4503                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4504                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4505                 return;
4506
4507         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4508                 NFS_ATTR_FATTR_NLINK;
4509         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4510         fattr->nlink = 2;
4511 }
4512
4513 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4514                 struct nfs4_fs_locations *fs_locations, struct page *page)
4515 {
4516         struct nfs_server *server = NFS_SERVER(dir);
4517         u32 bitmask[2] = {
4518                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4519                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4520         };
4521         struct nfs4_fs_locations_arg args = {
4522                 .dir_fh = NFS_FH(dir),
4523                 .name = name,
4524                 .page = page,
4525                 .bitmask = bitmask,
4526         };
4527         struct nfs4_fs_locations_res res = {
4528                 .fs_locations = fs_locations,
4529         };
4530         struct rpc_message msg = {
4531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4532                 .rpc_argp = &args,
4533                 .rpc_resp = &res,
4534         };
4535         int status;
4536
4537         dprintk("%s: start\n", __func__);
4538         nfs_fattr_init(&fs_locations->fattr);
4539         fs_locations->server = server;
4540         fs_locations->nlocations = 0;
4541         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4542         nfs_fixup_referral_attributes(&fs_locations->fattr);
4543         dprintk("%s: returned status = %d\n", __func__, status);
4544         return status;
4545 }
4546
4547 #ifdef CONFIG_NFS_V4_1
4548 /*
4549  * nfs4_proc_exchange_id()
4550  *
4551  * Since the clientid has expired, all compounds using sessions
4552  * associated with the stale clientid will be returning
4553  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4554  * be in some phase of session reset.
4555  */
4556 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4557 {
4558         nfs4_verifier verifier;
4559         struct nfs41_exchange_id_args args = {
4560                 .client = clp,
4561                 .flags = clp->cl_exchange_flags,
4562         };
4563         struct nfs41_exchange_id_res res = {
4564                 .client = clp,
4565         };
4566         int status;
4567         struct rpc_message msg = {
4568                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4569                 .rpc_argp = &args,
4570                 .rpc_resp = &res,
4571                 .rpc_cred = cred,
4572         };
4573         __be32 *p;
4574
4575         dprintk("--> %s\n", __func__);
4576         BUG_ON(clp == NULL);
4577
4578         /* Remove server-only flags */
4579         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4580
4581         p = (u32 *)verifier.data;
4582         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4583         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4584         args.verifier = &verifier;
4585
4586         while (1) {
4587                 args.id_len = scnprintf(args.id, sizeof(args.id),
4588                                         "%s/%s %u",
4589                                         clp->cl_ipaddr,
4590                                         rpc_peeraddr2str(clp->cl_rpcclient,
4591                                                          RPC_DISPLAY_ADDR),
4592                                         clp->cl_id_uniquifier);
4593
4594                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4595
4596                 if (status != -NFS4ERR_CLID_INUSE)
4597                         break;
4598
4599                 if (signalled())
4600                         break;
4601
4602                 if (++clp->cl_id_uniquifier == 0)
4603                         break;
4604         }
4605
4606         dprintk("<-- %s status= %d\n", __func__, status);
4607         return status;
4608 }
4609
4610 struct nfs4_get_lease_time_data {
4611         struct nfs4_get_lease_time_args *args;
4612         struct nfs4_get_lease_time_res *res;
4613         struct nfs_client *clp;
4614 };
4615
4616 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4617                                         void *calldata)
4618 {
4619         int ret;
4620         struct nfs4_get_lease_time_data *data =
4621                         (struct nfs4_get_lease_time_data *)calldata;
4622
4623         dprintk("--> %s\n", __func__);
4624         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4625         /* just setup sequence, do not trigger session recovery
4626            since we're invoked within one */
4627         ret = nfs41_setup_sequence(data->clp->cl_session,
4628                                    &data->args->la_seq_args,
4629                                    &data->res->lr_seq_res, 0, task);
4630
4631         BUG_ON(ret == -EAGAIN);
4632         rpc_call_start(task);
4633         dprintk("<-- %s\n", __func__);
4634 }
4635
4636 /*
4637  * Called from nfs4_state_manager thread for session setup, so don't recover
4638  * from sequence operation or clientid errors.
4639  */
4640 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4641 {
4642         struct nfs4_get_lease_time_data *data =
4643                         (struct nfs4_get_lease_time_data *)calldata;
4644
4645         dprintk("--> %s\n", __func__);
4646         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4647                 return;
4648         switch (task->tk_status) {
4649         case -NFS4ERR_DELAY:
4650         case -NFS4ERR_GRACE:
4651         case -EKEYEXPIRED:
4652                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4653                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4654                 task->tk_status = 0;
4655                 nfs_restart_rpc(task, data->clp);
4656                 return;
4657         }
4658         dprintk("<-- %s\n", __func__);
4659 }
4660
4661 struct rpc_call_ops nfs4_get_lease_time_ops = {
4662         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4663         .rpc_call_done = nfs4_get_lease_time_done,
4664 };
4665
4666 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4667 {
4668         struct rpc_task *task;
4669         struct nfs4_get_lease_time_args args;
4670         struct nfs4_get_lease_time_res res = {
4671                 .lr_fsinfo = fsinfo,
4672         };
4673         struct nfs4_get_lease_time_data data = {
4674                 .args = &args,
4675                 .res = &res,
4676                 .clp = clp,
4677         };
4678         struct rpc_message msg = {
4679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4680                 .rpc_argp = &args,
4681                 .rpc_resp = &res,
4682         };
4683         struct rpc_task_setup task_setup = {
4684                 .rpc_client = clp->cl_rpcclient,
4685                 .rpc_message = &msg,
4686                 .callback_ops = &nfs4_get_lease_time_ops,
4687                 .callback_data = &data
4688         };
4689         int status;
4690
4691         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4692         dprintk("--> %s\n", __func__);
4693         task = rpc_run_task(&task_setup);
4694
4695         if (IS_ERR(task))
4696                 status = PTR_ERR(task);
4697         else {
4698                 status = task->tk_status;
4699                 rpc_put_task(task);
4700         }
4701         dprintk("<-- %s return %d\n", __func__, status);
4702
4703         return status;
4704 }
4705
4706 /*
4707  * Reset a slot table
4708  */
4709 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4710                                  int ivalue)
4711 {
4712         struct nfs4_slot *new = NULL;
4713         int i;
4714         int ret = 0;
4715
4716         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4717                 max_reqs, tbl->max_slots);
4718
4719         /* Does the newly negotiated max_reqs match the existing slot table? */
4720         if (max_reqs != tbl->max_slots) {
4721                 ret = -ENOMEM;
4722                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4723                               GFP_NOFS);
4724                 if (!new)
4725                         goto out;
4726                 ret = 0;
4727                 kfree(tbl->slots);
4728         }
4729         spin_lock(&tbl->slot_tbl_lock);
4730         if (new) {
4731                 tbl->slots = new;
4732                 tbl->max_slots = max_reqs;
4733         }
4734         for (i = 0; i < tbl->max_slots; ++i)
4735                 tbl->slots[i].seq_nr = ivalue;
4736         spin_unlock(&tbl->slot_tbl_lock);
4737         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4738                 tbl, tbl->slots, tbl->max_slots);
4739 out:
4740         dprintk("<-- %s: return %d\n", __func__, ret);
4741         return ret;
4742 }
4743
4744 /*
4745  * Reset the forechannel and backchannel slot tables
4746  */
4747 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4748 {
4749         int status;
4750
4751         status = nfs4_reset_slot_table(&session->fc_slot_table,
4752                         session->fc_attrs.max_reqs, 1);
4753         if (status)
4754                 return status;
4755
4756         status = nfs4_reset_slot_table(&session->bc_slot_table,
4757                         session->bc_attrs.max_reqs, 0);
4758         return status;
4759 }
4760
4761 /* Destroy the slot table */
4762 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4763 {
4764         if (session->fc_slot_table.slots != NULL) {
4765                 kfree(session->fc_slot_table.slots);
4766                 session->fc_slot_table.slots = NULL;
4767         }
4768         if (session->bc_slot_table.slots != NULL) {
4769                 kfree(session->bc_slot_table.slots);
4770                 session->bc_slot_table.slots = NULL;
4771         }
4772         return;
4773 }
4774
4775 /*
4776  * Initialize slot table
4777  */
4778 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4779                 int max_slots, int ivalue)
4780 {
4781         struct nfs4_slot *slot;
4782         int ret = -ENOMEM;
4783
4784         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4785
4786         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4787
4788         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4789         if (!slot)
4790                 goto out;
4791         ret = 0;
4792
4793         spin_lock(&tbl->slot_tbl_lock);
4794         tbl->max_slots = max_slots;
4795         tbl->slots = slot;
4796         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4797         spin_unlock(&tbl->slot_tbl_lock);
4798         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4799                 tbl, tbl->slots, tbl->max_slots);
4800 out:
4801         dprintk("<-- %s: return %d\n", __func__, ret);
4802         return ret;
4803 }
4804
4805 /*
4806  * Initialize the forechannel and backchannel tables
4807  */
4808 static int nfs4_init_slot_tables(struct nfs4_session *session)
4809 {
4810         struct nfs4_slot_table *tbl;
4811         int status = 0;
4812
4813         tbl = &session->fc_slot_table;
4814         if (tbl->slots == NULL) {
4815                 status = nfs4_init_slot_table(tbl,
4816                                 session->fc_attrs.max_reqs, 1);
4817                 if (status)
4818                         return status;
4819         }
4820
4821         tbl = &session->bc_slot_table;
4822         if (tbl->slots == NULL) {
4823                 status = nfs4_init_slot_table(tbl,
4824                                 session->bc_attrs.max_reqs, 0);
4825                 if (status)
4826                         nfs4_destroy_slot_tables(session);
4827         }
4828
4829         return status;
4830 }
4831
4832 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4833 {
4834         struct nfs4_session *session;
4835         struct nfs4_slot_table *tbl;
4836
4837         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4838         if (!session)
4839                 return NULL;
4840
4841         init_completion(&session->complete);
4842
4843         tbl = &session->fc_slot_table;
4844         tbl->highest_used_slotid = -1;
4845         spin_lock_init(&tbl->slot_tbl_lock);
4846         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4847
4848         tbl = &session->bc_slot_table;
4849         tbl->highest_used_slotid = -1;
4850         spin_lock_init(&tbl->slot_tbl_lock);
4851         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4852
4853         session->session_state = 1<<NFS4_SESSION_INITING;
4854
4855         session->clp = clp;
4856         return session;
4857 }
4858
4859 void nfs4_destroy_session(struct nfs4_session *session)
4860 {
4861         nfs4_proc_destroy_session(session);
4862         dprintk("%s Destroy backchannel for xprt %p\n",
4863                 __func__, session->clp->cl_rpcclient->cl_xprt);
4864         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4865                                 NFS41_BC_MIN_CALLBACKS);
4866         nfs4_destroy_slot_tables(session);
4867         kfree(session);
4868 }
4869
4870 /*
4871  * Initialize the values to be used by the client in CREATE_SESSION
4872  * If nfs4_init_session set the fore channel request and response sizes,
4873  * use them.
4874  *
4875  * Set the back channel max_resp_sz_cached to zero to force the client to
4876  * always set csa_cachethis to FALSE because the current implementation
4877  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4878  */
4879 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4880 {
4881         struct nfs4_session *session = args->client->cl_session;
4882         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4883                      mxresp_sz = session->fc_attrs.max_resp_sz;
4884
4885         if (mxrqst_sz == 0)
4886                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4887         if (mxresp_sz == 0)
4888                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4889         /* Fore channel attributes */
4890         args->fc_attrs.headerpadsz = 0;
4891         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4892         args->fc_attrs.max_resp_sz = mxresp_sz;
4893         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4894         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4895
4896         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4897                 "max_ops=%u max_reqs=%u\n",
4898                 __func__,
4899                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4900                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4901
4902         /* Back channel attributes */
4903         args->bc_attrs.headerpadsz = 0;
4904         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4905         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4906         args->bc_attrs.max_resp_sz_cached = 0;
4907         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4908         args->bc_attrs.max_reqs = 1;
4909
4910         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4911                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4912                 __func__,
4913                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4914                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4915                 args->bc_attrs.max_reqs);
4916 }
4917
4918 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4919 {
4920         if (rcvd <= sent)
4921                 return 0;
4922         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4923                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4924         return -EINVAL;
4925 }
4926
4927 #define _verify_fore_channel_attr(_name_) \
4928         _verify_channel_attr("fore", #_name_, \
4929                              args->fc_attrs._name_, \
4930                              session->fc_attrs._name_)
4931
4932 #define _verify_back_channel_attr(_name_) \
4933         _verify_channel_attr("back", #_name_, \
4934                              args->bc_attrs._name_, \
4935                              session->bc_attrs._name_)
4936
4937 /*
4938  * The server is not allowed to increase the fore channel header pad size,
4939  * maximum response size, or maximum number of operations.
4940  *
4941  * The back channel attributes are only negotiatied down: We send what the
4942  * (back channel) server insists upon.
4943  */
4944 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4945                                      struct nfs4_session *session)
4946 {
4947         int ret = 0;
4948
4949         ret |= _verify_fore_channel_attr(headerpadsz);
4950         ret |= _verify_fore_channel_attr(max_resp_sz);
4951         ret |= _verify_fore_channel_attr(max_ops);
4952
4953         ret |= _verify_back_channel_attr(headerpadsz);
4954         ret |= _verify_back_channel_attr(max_rqst_sz);
4955         ret |= _verify_back_channel_attr(max_resp_sz);
4956         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4957         ret |= _verify_back_channel_attr(max_ops);
4958         ret |= _verify_back_channel_attr(max_reqs);
4959
4960         return ret;
4961 }
4962
4963 static int _nfs4_proc_create_session(struct nfs_client *clp)
4964 {
4965         struct nfs4_session *session = clp->cl_session;
4966         struct nfs41_create_session_args args = {
4967                 .client = clp,
4968                 .cb_program = NFS4_CALLBACK,
4969         };
4970         struct nfs41_create_session_res res = {
4971                 .client = clp,
4972         };
4973         struct rpc_message msg = {
4974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4975                 .rpc_argp = &args,
4976                 .rpc_resp = &res,
4977         };
4978         int status;
4979
4980         nfs4_init_channel_attrs(&args);
4981         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4982
4983         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4984
4985         if (!status)
4986                 /* Verify the session's negotiated channel_attrs values */
4987                 status = nfs4_verify_channel_attrs(&args, session);
4988         if (!status) {
4989                 /* Increment the clientid slot sequence id */
4990                 clp->cl_seqid++;
4991         }
4992
4993         return status;
4994 }
4995
4996 /*
4997  * Issues a CREATE_SESSION operation to the server.
4998  * It is the responsibility of the caller to verify the session is
4999  * expired before calling this routine.
5000  */
5001 int nfs4_proc_create_session(struct nfs_client *clp)
5002 {
5003         int status;
5004         unsigned *ptr;
5005         struct nfs4_session *session = clp->cl_session;
5006
5007         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5008
5009         status = _nfs4_proc_create_session(clp);
5010         if (status)
5011                 goto out;
5012
5013         /* Init and reset the fore channel */
5014         status = nfs4_init_slot_tables(session);
5015         dprintk("slot table initialization returned %d\n", status);
5016         if (status)
5017                 goto out;
5018         status = nfs4_reset_slot_tables(session);
5019         dprintk("slot table reset returned %d\n", status);
5020         if (status)
5021                 goto out;
5022
5023         ptr = (unsigned *)&session->sess_id.data[0];
5024         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5025                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5026 out:
5027         dprintk("<-- %s\n", __func__);
5028         return status;
5029 }
5030
5031 /*
5032  * Issue the over-the-wire RPC DESTROY_SESSION.
5033  * The caller must serialize access to this routine.
5034  */
5035 int nfs4_proc_destroy_session(struct nfs4_session *session)
5036 {
5037         int status = 0;
5038         struct rpc_message msg;
5039
5040         dprintk("--> nfs4_proc_destroy_session\n");
5041
5042         /* session is still being setup */
5043         if (session->clp->cl_cons_state != NFS_CS_READY)
5044                 return status;
5045
5046         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5047         msg.rpc_argp = session;
5048         msg.rpc_resp = NULL;
5049         msg.rpc_cred = NULL;
5050         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5051
5052         if (status)
5053                 printk(KERN_WARNING
5054                         "Got error %d from the server on DESTROY_SESSION. "
5055                         "Session has been destroyed regardless...\n", status);
5056
5057         dprintk("<-- nfs4_proc_destroy_session\n");
5058         return status;
5059 }
5060
5061 int nfs4_init_session(struct nfs_server *server)
5062 {
5063         struct nfs_client *clp = server->nfs_client;
5064         struct nfs4_session *session;
5065         unsigned int rsize, wsize;
5066         int ret;
5067
5068         if (!nfs4_has_session(clp))
5069                 return 0;
5070
5071         session = clp->cl_session;
5072         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5073                 return 0;
5074
5075         rsize = server->rsize;
5076         if (rsize == 0)
5077                 rsize = NFS_MAX_FILE_IO_SIZE;
5078         wsize = server->wsize;
5079         if (wsize == 0)
5080                 wsize = NFS_MAX_FILE_IO_SIZE;
5081
5082         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5083         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5084
5085         ret = nfs4_recover_expired_lease(server);
5086         if (!ret)
5087                 ret = nfs4_check_client_ready(clp);
5088         return ret;
5089 }
5090
5091 /*
5092  * Renew the cl_session lease.
5093  */
5094 struct nfs4_sequence_data {
5095         struct nfs_client *clp;
5096         struct nfs4_sequence_args args;
5097         struct nfs4_sequence_res res;
5098 };
5099
5100 static void nfs41_sequence_release(void *data)
5101 {
5102         struct nfs4_sequence_data *calldata = data;
5103         struct nfs_client *clp = calldata->clp;
5104
5105         if (atomic_read(&clp->cl_count) > 1)
5106                 nfs4_schedule_state_renewal(clp);
5107         nfs_put_client(clp);
5108         kfree(calldata);
5109 }
5110
5111 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5112 {
5113         switch(task->tk_status) {
5114         case -NFS4ERR_DELAY:
5115         case -EKEYEXPIRED:
5116                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5117                 return -EAGAIN;
5118         default:
5119                 nfs4_schedule_state_recovery(clp);
5120         }
5121         return 0;
5122 }
5123
5124 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5125 {
5126         struct nfs4_sequence_data *calldata = data;
5127         struct nfs_client *clp = calldata->clp;
5128
5129         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5130                 return;
5131
5132         if (task->tk_status < 0) {
5133                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5134                 if (atomic_read(&clp->cl_count) == 1)
5135                         goto out;
5136
5137                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5138                         rpc_restart_call_prepare(task);
5139                         return;
5140                 }
5141         }
5142         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5143 out:
5144         dprintk("<-- %s\n", __func__);
5145 }
5146
5147 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5148 {
5149         struct nfs4_sequence_data *calldata = data;
5150         struct nfs_client *clp = calldata->clp;
5151         struct nfs4_sequence_args *args;
5152         struct nfs4_sequence_res *res;
5153
5154         args = task->tk_msg.rpc_argp;
5155         res = task->tk_msg.rpc_resp;
5156
5157         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5158                 return;
5159         rpc_call_start(task);
5160 }
5161
5162 static const struct rpc_call_ops nfs41_sequence_ops = {
5163         .rpc_call_done = nfs41_sequence_call_done,
5164         .rpc_call_prepare = nfs41_sequence_prepare,
5165         .rpc_release = nfs41_sequence_release,
5166 };
5167
5168 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5169 {
5170         struct nfs4_sequence_data *calldata;
5171         struct rpc_message msg = {
5172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5173                 .rpc_cred = cred,
5174         };
5175         struct rpc_task_setup task_setup_data = {
5176                 .rpc_client = clp->cl_rpcclient,
5177                 .rpc_message = &msg,
5178                 .callback_ops = &nfs41_sequence_ops,
5179                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5180         };
5181
5182         if (!atomic_inc_not_zero(&clp->cl_count))
5183                 return ERR_PTR(-EIO);
5184         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5185         if (calldata == NULL) {
5186                 nfs_put_client(clp);
5187                 return ERR_PTR(-ENOMEM);
5188         }
5189         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5190         msg.rpc_argp = &calldata->args;
5191         msg.rpc_resp = &calldata->res;
5192         calldata->clp = clp;
5193         task_setup_data.callback_data = calldata;
5194
5195         return rpc_run_task(&task_setup_data);
5196 }
5197
5198 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5199 {
5200         struct rpc_task *task;
5201         int ret = 0;
5202
5203         task = _nfs41_proc_sequence(clp, cred);
5204         if (IS_ERR(task))
5205                 ret = PTR_ERR(task);
5206         else
5207                 rpc_put_task(task);
5208         dprintk("<-- %s status=%d\n", __func__, ret);
5209         return ret;
5210 }
5211
5212 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5213 {
5214         struct rpc_task *task;
5215         int ret;
5216
5217         task = _nfs41_proc_sequence(clp, cred);
5218         if (IS_ERR(task)) {
5219                 ret = PTR_ERR(task);
5220                 goto out;
5221         }
5222         ret = rpc_wait_for_completion_task(task);
5223         if (!ret)
5224                 ret = task->tk_status;
5225         rpc_put_task(task);
5226 out:
5227         dprintk("<-- %s status=%d\n", __func__, ret);
5228         return ret;
5229 }
5230
5231 struct nfs4_reclaim_complete_data {
5232         struct nfs_client *clp;
5233         struct nfs41_reclaim_complete_args arg;
5234         struct nfs41_reclaim_complete_res res;
5235 };
5236
5237 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5238 {
5239         struct nfs4_reclaim_complete_data *calldata = data;
5240
5241         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5242         if (nfs41_setup_sequence(calldata->clp->cl_session,
5243                                 &calldata->arg.seq_args,
5244                                 &calldata->res.seq_res, 0, task))
5245                 return;
5246
5247         rpc_call_start(task);
5248 }
5249
5250 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5251 {
5252         switch(task->tk_status) {
5253         case 0:
5254         case -NFS4ERR_COMPLETE_ALREADY:
5255         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5256                 break;
5257         case -NFS4ERR_DELAY:
5258         case -EKEYEXPIRED:
5259                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5260                 return -EAGAIN;
5261         default:
5262                 nfs4_schedule_state_recovery(clp);
5263         }
5264         return 0;
5265 }
5266
5267 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5268 {
5269         struct nfs4_reclaim_complete_data *calldata = data;
5270         struct nfs_client *clp = calldata->clp;
5271         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5272
5273         dprintk("--> %s\n", __func__);
5274         if (!nfs41_sequence_done(task, res))
5275                 return;
5276
5277         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5278                 rpc_restart_call_prepare(task);
5279                 return;
5280         }
5281         dprintk("<-- %s\n", __func__);
5282 }
5283
5284 static void nfs4_free_reclaim_complete_data(void *data)
5285 {
5286         struct nfs4_reclaim_complete_data *calldata = data;
5287
5288         kfree(calldata);
5289 }
5290
5291 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5292         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5293         .rpc_call_done = nfs4_reclaim_complete_done,
5294         .rpc_release = nfs4_free_reclaim_complete_data,
5295 };
5296
5297 /*
5298  * Issue a global reclaim complete.
5299  */
5300 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5301 {
5302         struct nfs4_reclaim_complete_data *calldata;
5303         struct rpc_task *task;
5304         struct rpc_message msg = {
5305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5306         };
5307         struct rpc_task_setup task_setup_data = {
5308                 .rpc_client = clp->cl_rpcclient,
5309                 .rpc_message = &msg,
5310                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5311                 .flags = RPC_TASK_ASYNC,
5312         };
5313         int status = -ENOMEM;
5314
5315         dprintk("--> %s\n", __func__);
5316         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5317         if (calldata == NULL)
5318                 goto out;
5319         calldata->clp = clp;
5320         calldata->arg.one_fs = 0;
5321         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5322
5323         msg.rpc_argp = &calldata->arg;
5324         msg.rpc_resp = &calldata->res;
5325         task_setup_data.callback_data = calldata;
5326         task = rpc_run_task(&task_setup_data);
5327         if (IS_ERR(task)) {
5328                 status = PTR_ERR(task);
5329                 goto out;
5330         }
5331         rpc_put_task(task);
5332         return 0;
5333 out:
5334         dprintk("<-- %s status=%d\n", __func__, status);
5335         return status;
5336 }
5337 #endif /* CONFIG_NFS_V4_1 */
5338
5339 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5340         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5341         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5342         .recover_open   = nfs4_open_reclaim,
5343         .recover_lock   = nfs4_lock_reclaim,
5344         .establish_clid = nfs4_init_clientid,
5345         .get_clid_cred  = nfs4_get_setclientid_cred,
5346 };
5347
5348 #if defined(CONFIG_NFS_V4_1)
5349 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5350         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5351         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5352         .recover_open   = nfs4_open_reclaim,
5353         .recover_lock   = nfs4_lock_reclaim,
5354         .establish_clid = nfs41_init_clientid,
5355         .get_clid_cred  = nfs4_get_exchange_id_cred,
5356         .reclaim_complete = nfs41_proc_reclaim_complete,
5357 };
5358 #endif /* CONFIG_NFS_V4_1 */
5359
5360 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5361         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5362         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5363         .recover_open   = nfs4_open_expired,
5364         .recover_lock   = nfs4_lock_expired,
5365         .establish_clid = nfs4_init_clientid,
5366         .get_clid_cred  = nfs4_get_setclientid_cred,
5367 };
5368
5369 #if defined(CONFIG_NFS_V4_1)
5370 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5371         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5372         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5373         .recover_open   = nfs4_open_expired,
5374         .recover_lock   = nfs4_lock_expired,
5375         .establish_clid = nfs41_init_clientid,
5376         .get_clid_cred  = nfs4_get_exchange_id_cred,
5377 };
5378 #endif /* CONFIG_NFS_V4_1 */
5379
5380 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5381         .sched_state_renewal = nfs4_proc_async_renew,
5382         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5383         .renew_lease = nfs4_proc_renew,
5384 };
5385
5386 #if defined(CONFIG_NFS_V4_1)
5387 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5388         .sched_state_renewal = nfs41_proc_async_sequence,
5389         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5390         .renew_lease = nfs4_proc_sequence,
5391 };
5392 #endif
5393
5394 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5395         .minor_version = 0,
5396         .call_sync = _nfs4_call_sync,
5397         .validate_stateid = nfs4_validate_delegation_stateid,
5398         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5399         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5400         .state_renewal_ops = &nfs40_state_renewal_ops,
5401 };
5402
5403 #if defined(CONFIG_NFS_V4_1)
5404 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5405         .minor_version = 1,
5406         .call_sync = _nfs4_call_sync_session,
5407         .validate_stateid = nfs41_validate_delegation_stateid,
5408         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5409         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5410         .state_renewal_ops = &nfs41_state_renewal_ops,
5411 };
5412 #endif
5413
5414 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5415         [0] = &nfs_v4_0_minor_ops,
5416 #if defined(CONFIG_NFS_V4_1)
5417         [1] = &nfs_v4_1_minor_ops,
5418 #endif
5419 };
5420
5421 static const struct inode_operations nfs4_file_inode_operations = {
5422         .permission     = nfs_permission,
5423         .getattr        = nfs_getattr,
5424         .setattr        = nfs_setattr,
5425         .getxattr       = nfs4_getxattr,
5426         .setxattr       = nfs4_setxattr,
5427         .listxattr      = nfs4_listxattr,
5428 };
5429
5430 const struct nfs_rpc_ops nfs_v4_clientops = {
5431         .version        = 4,                    /* protocol version */
5432         .dentry_ops     = &nfs4_dentry_operations,
5433         .dir_inode_ops  = &nfs4_dir_inode_operations,
5434         .file_inode_ops = &nfs4_file_inode_operations,
5435         .getroot        = nfs4_proc_get_root,
5436         .getattr        = nfs4_proc_getattr,
5437         .setattr        = nfs4_proc_setattr,
5438         .lookupfh       = nfs4_proc_lookupfh,
5439         .lookup         = nfs4_proc_lookup,
5440         .access         = nfs4_proc_access,
5441         .readlink       = nfs4_proc_readlink,
5442         .create         = nfs4_proc_create,
5443         .remove         = nfs4_proc_remove,
5444         .unlink_setup   = nfs4_proc_unlink_setup,
5445         .unlink_done    = nfs4_proc_unlink_done,
5446         .rename         = nfs4_proc_rename,
5447         .link           = nfs4_proc_link,
5448         .symlink        = nfs4_proc_symlink,
5449         .mkdir          = nfs4_proc_mkdir,
5450         .rmdir          = nfs4_proc_remove,
5451         .readdir        = nfs4_proc_readdir,
5452         .mknod          = nfs4_proc_mknod,
5453         .statfs         = nfs4_proc_statfs,
5454         .fsinfo         = nfs4_proc_fsinfo,
5455         .pathconf       = nfs4_proc_pathconf,
5456         .set_capabilities = nfs4_server_capabilities,
5457         .decode_dirent  = nfs4_decode_dirent,
5458         .read_setup     = nfs4_proc_read_setup,
5459         .read_done      = nfs4_read_done,
5460         .write_setup    = nfs4_proc_write_setup,
5461         .write_done     = nfs4_write_done,
5462         .commit_setup   = nfs4_proc_commit_setup,
5463         .commit_done    = nfs4_commit_done,
5464         .lock           = nfs4_proc_lock,
5465         .clear_acl_cache = nfs4_zap_acl_attr,
5466         .close_context  = nfs4_close_context,
5467 };
5468
5469 /*
5470  * Local variables:
5471  *  c-basic-offset: 8
5472  * End:
5473  */