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 (RPC_ASSASSINATED(task))
1279                 return;
1280         if (data->rpc_status == 0) {
1281                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1282                                 sizeof(data->o_res.stateid.data));
1283                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1284                 renew_lease(data->o_res.server, data->timestamp);
1285                 data->rpc_done = 1;
1286         }
1287 }
1288
1289 static void nfs4_open_confirm_release(void *calldata)
1290 {
1291         struct nfs4_opendata *data = calldata;
1292         struct nfs4_state *state = NULL;
1293
1294         /* If this request hasn't been cancelled, do nothing */
1295         if (data->cancelled == 0)
1296                 goto out_free;
1297         /* In case of error, no cleanup! */
1298         if (!data->rpc_done)
1299                 goto out_free;
1300         state = nfs4_opendata_to_nfs4_state(data);
1301         if (!IS_ERR(state))
1302                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1303 out_free:
1304         nfs4_opendata_put(data);
1305 }
1306
1307 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1308         .rpc_call_done = nfs4_open_confirm_done,
1309         .rpc_release = nfs4_open_confirm_release,
1310 };
1311
1312 /*
1313  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1314  */
1315 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1316 {
1317         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1318         struct rpc_task *task;
1319         struct  rpc_message msg = {
1320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1321                 .rpc_argp = &data->c_arg,
1322                 .rpc_resp = &data->c_res,
1323                 .rpc_cred = data->owner->so_cred,
1324         };
1325         struct rpc_task_setup task_setup_data = {
1326                 .rpc_client = server->client,
1327                 .rpc_message = &msg,
1328                 .callback_ops = &nfs4_open_confirm_ops,
1329                 .callback_data = data,
1330                 .workqueue = nfsiod_workqueue,
1331                 .flags = RPC_TASK_ASYNC,
1332         };
1333         int status;
1334
1335         kref_get(&data->kref);
1336         data->rpc_done = 0;
1337         data->rpc_status = 0;
1338         data->timestamp = jiffies;
1339         task = rpc_run_task(&task_setup_data);
1340         if (IS_ERR(task))
1341                 return PTR_ERR(task);
1342         status = nfs4_wait_for_completion_rpc_task(task);
1343         if (status != 0) {
1344                 data->cancelled = 1;
1345                 smp_wmb();
1346         } else
1347                 status = data->rpc_status;
1348         rpc_put_task(task);
1349         return status;
1350 }
1351
1352 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1353 {
1354         struct nfs4_opendata *data = calldata;
1355         struct nfs4_state_owner *sp = data->owner;
1356
1357         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1358                 return;
1359         /*
1360          * Check if we still need to send an OPEN call, or if we can use
1361          * a delegation instead.
1362          */
1363         if (data->state != NULL) {
1364                 struct nfs_delegation *delegation;
1365
1366                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1367                         goto out_no_action;
1368                 rcu_read_lock();
1369                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1370                 if (delegation != NULL &&
1371                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1372                         rcu_read_unlock();
1373                         goto out_no_action;
1374                 }
1375                 rcu_read_unlock();
1376         }
1377         /* Update sequence id. */
1378         data->o_arg.id = sp->so_owner_id.id;
1379         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1380         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1381                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1382                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1383         }
1384         data->timestamp = jiffies;
1385         if (nfs4_setup_sequence(data->o_arg.server,
1386                                 &data->o_arg.seq_args,
1387                                 &data->o_res.seq_res, 1, task))
1388                 return;
1389         rpc_call_start(task);
1390         return;
1391 out_no_action:
1392         task->tk_action = NULL;
1393
1394 }
1395
1396 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1397 {
1398         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1399         nfs4_open_prepare(task, calldata);
1400 }
1401
1402 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1403 {
1404         struct nfs4_opendata *data = calldata;
1405
1406         data->rpc_status = task->tk_status;
1407
1408         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1409                 return;
1410
1411         if (RPC_ASSASSINATED(task))
1412                 return;
1413         if (task->tk_status == 0) {
1414                 switch (data->o_res.f_attr->mode & S_IFMT) {
1415                         case S_IFREG:
1416                                 break;
1417                         case S_IFLNK:
1418                                 data->rpc_status = -ELOOP;
1419                                 break;
1420                         case S_IFDIR:
1421                                 data->rpc_status = -EISDIR;
1422                                 break;
1423                         default:
1424                                 data->rpc_status = -ENOTDIR;
1425                 }
1426                 renew_lease(data->o_res.server, data->timestamp);
1427                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1428                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1429         }
1430         data->rpc_done = 1;
1431 }
1432
1433 static void nfs4_open_release(void *calldata)
1434 {
1435         struct nfs4_opendata *data = calldata;
1436         struct nfs4_state *state = NULL;
1437
1438         /* If this request hasn't been cancelled, do nothing */
1439         if (data->cancelled == 0)
1440                 goto out_free;
1441         /* In case of error, no cleanup! */
1442         if (data->rpc_status != 0 || !data->rpc_done)
1443                 goto out_free;
1444         /* In case we need an open_confirm, no cleanup! */
1445         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1446                 goto out_free;
1447         state = nfs4_opendata_to_nfs4_state(data);
1448         if (!IS_ERR(state))
1449                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1450 out_free:
1451         nfs4_opendata_put(data);
1452 }
1453
1454 static const struct rpc_call_ops nfs4_open_ops = {
1455         .rpc_call_prepare = nfs4_open_prepare,
1456         .rpc_call_done = nfs4_open_done,
1457         .rpc_release = nfs4_open_release,
1458 };
1459
1460 static const struct rpc_call_ops nfs4_recover_open_ops = {
1461         .rpc_call_prepare = nfs4_recover_open_prepare,
1462         .rpc_call_done = nfs4_open_done,
1463         .rpc_release = nfs4_open_release,
1464 };
1465
1466 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1467 {
1468         struct inode *dir = data->dir->d_inode;
1469         struct nfs_server *server = NFS_SERVER(dir);
1470         struct nfs_openargs *o_arg = &data->o_arg;
1471         struct nfs_openres *o_res = &data->o_res;
1472         struct rpc_task *task;
1473         struct rpc_message msg = {
1474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1475                 .rpc_argp = o_arg,
1476                 .rpc_resp = o_res,
1477                 .rpc_cred = data->owner->so_cred,
1478         };
1479         struct rpc_task_setup task_setup_data = {
1480                 .rpc_client = server->client,
1481                 .rpc_message = &msg,
1482                 .callback_ops = &nfs4_open_ops,
1483                 .callback_data = data,
1484                 .workqueue = nfsiod_workqueue,
1485                 .flags = RPC_TASK_ASYNC,
1486         };
1487         int status;
1488
1489         kref_get(&data->kref);
1490         data->rpc_done = 0;
1491         data->rpc_status = 0;
1492         data->cancelled = 0;
1493         if (isrecover)
1494                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1495         task = rpc_run_task(&task_setup_data);
1496         if (IS_ERR(task))
1497                 return PTR_ERR(task);
1498         status = nfs4_wait_for_completion_rpc_task(task);
1499         if (status != 0) {
1500                 data->cancelled = 1;
1501                 smp_wmb();
1502         } else
1503                 status = data->rpc_status;
1504         rpc_put_task(task);
1505
1506         return status;
1507 }
1508
1509 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1510 {
1511         struct inode *dir = data->dir->d_inode;
1512         struct nfs_openres *o_res = &data->o_res;
1513         int status;
1514
1515         status = nfs4_run_open_task(data, 1);
1516         if (status != 0 || !data->rpc_done)
1517                 return status;
1518
1519         nfs_refresh_inode(dir, o_res->dir_attr);
1520
1521         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1522                 status = _nfs4_proc_open_confirm(data);
1523                 if (status != 0)
1524                         return status;
1525         }
1526
1527         return status;
1528 }
1529
1530 /*
1531  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1532  */
1533 static int _nfs4_proc_open(struct nfs4_opendata *data)
1534 {
1535         struct inode *dir = data->dir->d_inode;
1536         struct nfs_server *server = NFS_SERVER(dir);
1537         struct nfs_openargs *o_arg = &data->o_arg;
1538         struct nfs_openres *o_res = &data->o_res;
1539         int status;
1540
1541         status = nfs4_run_open_task(data, 0);
1542         if (status != 0 || !data->rpc_done)
1543                 return status;
1544
1545         if (o_arg->open_flags & O_CREAT) {
1546                 update_changeattr(dir, &o_res->cinfo);
1547                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1548         } else
1549                 nfs_refresh_inode(dir, o_res->dir_attr);
1550         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1551                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1552         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1553                 status = _nfs4_proc_open_confirm(data);
1554                 if (status != 0)
1555                         return status;
1556         }
1557         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1558                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1559         return 0;
1560 }
1561
1562 static int nfs4_recover_expired_lease(struct nfs_server *server)
1563 {
1564         struct nfs_client *clp = server->nfs_client;
1565         unsigned int loop;
1566         int ret;
1567
1568         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1569                 ret = nfs4_wait_clnt_recover(clp);
1570                 if (ret != 0)
1571                         break;
1572                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1573                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1574                         break;
1575                 nfs4_schedule_state_recovery(clp);
1576                 ret = -EIO;
1577         }
1578         return ret;
1579 }
1580
1581 /*
1582  * OPEN_EXPIRED:
1583  *      reclaim state on the server after a network partition.
1584  *      Assumes caller holds the appropriate lock
1585  */
1586 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1587 {
1588         struct nfs4_opendata *opendata;
1589         int ret;
1590
1591         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1592         if (IS_ERR(opendata))
1593                 return PTR_ERR(opendata);
1594         ret = nfs4_open_recover(opendata, state);
1595         if (ret == -ESTALE)
1596                 d_drop(ctx->path.dentry);
1597         nfs4_opendata_put(opendata);
1598         return ret;
1599 }
1600
1601 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1602 {
1603         struct nfs_server *server = NFS_SERVER(state->inode);
1604         struct nfs4_exception exception = { };
1605         int err;
1606
1607         do {
1608                 err = _nfs4_open_expired(ctx, state);
1609                 switch (err) {
1610                 default:
1611                         goto out;
1612                 case -NFS4ERR_GRACE:
1613                 case -NFS4ERR_DELAY:
1614                 case -EKEYEXPIRED:
1615                         nfs4_handle_exception(server, err, &exception);
1616                         err = 0;
1617                 }
1618         } while (exception.retry);
1619 out:
1620         return err;
1621 }
1622
1623 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1624 {
1625         struct nfs_open_context *ctx;
1626         int ret;
1627
1628         ctx = nfs4_state_find_open_context(state);
1629         if (IS_ERR(ctx))
1630                 return PTR_ERR(ctx);
1631         ret = nfs4_do_open_expired(ctx, state);
1632         put_nfs_open_context(ctx);
1633         return ret;
1634 }
1635
1636 /*
1637  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1638  * fields corresponding to attributes that were used to store the verifier.
1639  * Make sure we clobber those fields in the later setattr call
1640  */
1641 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1642 {
1643         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1644             !(sattr->ia_valid & ATTR_ATIME_SET))
1645                 sattr->ia_valid |= ATTR_ATIME;
1646
1647         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1648             !(sattr->ia_valid & ATTR_MTIME_SET))
1649                 sattr->ia_valid |= ATTR_MTIME;
1650 }
1651
1652 /*
1653  * Returns a referenced nfs4_state
1654  */
1655 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)
1656 {
1657         struct nfs4_state_owner  *sp;
1658         struct nfs4_state     *state = NULL;
1659         struct nfs_server       *server = NFS_SERVER(dir);
1660         struct nfs4_opendata *opendata;
1661         int status;
1662
1663         /* Protect against reboot recovery conflicts */
1664         status = -ENOMEM;
1665         if (!(sp = nfs4_get_state_owner(server, cred))) {
1666                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1667                 goto out_err;
1668         }
1669         status = nfs4_recover_expired_lease(server);
1670         if (status != 0)
1671                 goto err_put_state_owner;
1672         if (path->dentry->d_inode != NULL)
1673                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1674         status = -ENOMEM;
1675         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1676         if (opendata == NULL)
1677                 goto err_put_state_owner;
1678
1679         if (path->dentry->d_inode != NULL)
1680                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1681
1682         status = _nfs4_proc_open(opendata);
1683         if (status != 0)
1684                 goto err_opendata_put;
1685
1686         state = nfs4_opendata_to_nfs4_state(opendata);
1687         status = PTR_ERR(state);
1688         if (IS_ERR(state))
1689                 goto err_opendata_put;
1690         if (server->caps & NFS_CAP_POSIX_LOCK)
1691                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1692
1693         if (opendata->o_arg.open_flags & O_EXCL) {
1694                 nfs4_exclusive_attrset(opendata, sattr);
1695
1696                 nfs_fattr_init(opendata->o_res.f_attr);
1697                 status = nfs4_do_setattr(state->inode, cred,
1698                                 opendata->o_res.f_attr, sattr,
1699                                 state);
1700                 if (status == 0)
1701                         nfs_setattr_update_inode(state->inode, sattr);
1702                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1703         }
1704         nfs4_opendata_put(opendata);
1705         nfs4_put_state_owner(sp);
1706         *res = state;
1707         return 0;
1708 err_opendata_put:
1709         nfs4_opendata_put(opendata);
1710 err_put_state_owner:
1711         nfs4_put_state_owner(sp);
1712 out_err:
1713         *res = NULL;
1714         return status;
1715 }
1716
1717
1718 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)
1719 {
1720         struct nfs4_exception exception = { };
1721         struct nfs4_state *res;
1722         int status;
1723
1724         do {
1725                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1726                 if (status == 0)
1727                         break;
1728                 /* NOTE: BAD_SEQID means the server and client disagree about the
1729                  * book-keeping w.r.t. state-changing operations
1730                  * (OPEN/CLOSE/LOCK/LOCKU...)
1731                  * It is actually a sign of a bug on the client or on the server.
1732                  *
1733                  * If we receive a BAD_SEQID error in the particular case of
1734                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1735                  * have unhashed the old state_owner for us, and that we can
1736                  * therefore safely retry using a new one. We should still warn
1737                  * the user though...
1738                  */
1739                 if (status == -NFS4ERR_BAD_SEQID) {
1740                         printk(KERN_WARNING "NFS: v4 server %s "
1741                                         " returned a bad sequence-id error!\n",
1742                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1743                         exception.retry = 1;
1744                         continue;
1745                 }
1746                 /*
1747                  * BAD_STATEID on OPEN means that the server cancelled our
1748                  * state before it received the OPEN_CONFIRM.
1749                  * Recover by retrying the request as per the discussion
1750                  * on Page 181 of RFC3530.
1751                  */
1752                 if (status == -NFS4ERR_BAD_STATEID) {
1753                         exception.retry = 1;
1754                         continue;
1755                 }
1756                 if (status == -EAGAIN) {
1757                         /* We must have found a delegation */
1758                         exception.retry = 1;
1759                         continue;
1760                 }
1761                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1762                                         status, &exception));
1763         } while (exception.retry);
1764         return res;
1765 }
1766
1767 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1768                             struct nfs_fattr *fattr, struct iattr *sattr,
1769                             struct nfs4_state *state)
1770 {
1771         struct nfs_server *server = NFS_SERVER(inode);
1772         struct nfs_setattrargs  arg = {
1773                 .fh             = NFS_FH(inode),
1774                 .iap            = sattr,
1775                 .server         = server,
1776                 .bitmask = server->attr_bitmask,
1777         };
1778         struct nfs_setattrres  res = {
1779                 .fattr          = fattr,
1780                 .server         = server,
1781         };
1782         struct rpc_message msg = {
1783                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1784                 .rpc_argp       = &arg,
1785                 .rpc_resp       = &res,
1786                 .rpc_cred       = cred,
1787         };
1788         unsigned long timestamp = jiffies;
1789         int status;
1790
1791         nfs_fattr_init(fattr);
1792
1793         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1794                 /* Use that stateid */
1795         } else if (state != NULL) {
1796                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1797         } else
1798                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1799
1800         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1801         if (status == 0 && state != NULL)
1802                 renew_lease(server, timestamp);
1803         return status;
1804 }
1805
1806 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1807                            struct nfs_fattr *fattr, struct iattr *sattr,
1808                            struct nfs4_state *state)
1809 {
1810         struct nfs_server *server = NFS_SERVER(inode);
1811         struct nfs4_exception exception = { };
1812         int err;
1813         do {
1814                 err = nfs4_handle_exception(server,
1815                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1816                                 &exception);
1817         } while (exception.retry);
1818         return err;
1819 }
1820
1821 struct nfs4_closedata {
1822         struct path path;
1823         struct inode *inode;
1824         struct nfs4_state *state;
1825         struct nfs_closeargs arg;
1826         struct nfs_closeres res;
1827         struct nfs_fattr fattr;
1828         unsigned long timestamp;
1829 };
1830
1831 static void nfs4_free_closedata(void *data)
1832 {
1833         struct nfs4_closedata *calldata = data;
1834         struct nfs4_state_owner *sp = calldata->state->owner;
1835
1836         nfs4_put_open_state(calldata->state);
1837         nfs_free_seqid(calldata->arg.seqid);
1838         nfs4_put_state_owner(sp);
1839         path_put(&calldata->path);
1840         kfree(calldata);
1841 }
1842
1843 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1844                 fmode_t fmode)
1845 {
1846         spin_lock(&state->owner->so_lock);
1847         if (!(fmode & FMODE_READ))
1848                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1849         if (!(fmode & FMODE_WRITE))
1850                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1851         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1852         spin_unlock(&state->owner->so_lock);
1853 }
1854
1855 static void nfs4_close_done(struct rpc_task *task, void *data)
1856 {
1857         struct nfs4_closedata *calldata = data;
1858         struct nfs4_state *state = calldata->state;
1859         struct nfs_server *server = NFS_SERVER(calldata->inode);
1860
1861         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1862                 return;
1863         if (RPC_ASSASSINATED(task))
1864                 return;
1865         /* hmm. we are done with the inode, and in the process of freeing
1866          * the state_owner. we keep this around to process errors
1867          */
1868         switch (task->tk_status) {
1869                 case 0:
1870                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1871                         renew_lease(server, calldata->timestamp);
1872                         nfs4_close_clear_stateid_flags(state,
1873                                         calldata->arg.fmode);
1874                         break;
1875                 case -NFS4ERR_STALE_STATEID:
1876                 case -NFS4ERR_OLD_STATEID:
1877                 case -NFS4ERR_BAD_STATEID:
1878                 case -NFS4ERR_EXPIRED:
1879                         if (calldata->arg.fmode == 0)
1880                                 break;
1881                 default:
1882                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1883                                 rpc_restart_call_prepare(task);
1884         }
1885         nfs_release_seqid(calldata->arg.seqid);
1886         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1887 }
1888
1889 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1890 {
1891         struct nfs4_closedata *calldata = data;
1892         struct nfs4_state *state = calldata->state;
1893         int call_close = 0;
1894
1895         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1896                 return;
1897
1898         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1899         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1900         spin_lock(&state->owner->so_lock);
1901         /* Calculate the change in open mode */
1902         if (state->n_rdwr == 0) {
1903                 if (state->n_rdonly == 0) {
1904                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1905                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1906                         calldata->arg.fmode &= ~FMODE_READ;
1907                 }
1908                 if (state->n_wronly == 0) {
1909                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1910                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1911                         calldata->arg.fmode &= ~FMODE_WRITE;
1912                 }
1913         }
1914         spin_unlock(&state->owner->so_lock);
1915
1916         if (!call_close) {
1917                 /* Note: exit _without_ calling nfs4_close_done */
1918                 task->tk_action = NULL;
1919                 return;
1920         }
1921
1922         if (calldata->arg.fmode == 0)
1923                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1924
1925         nfs_fattr_init(calldata->res.fattr);
1926         calldata->timestamp = jiffies;
1927         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1928                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1929                                 1, task))
1930                 return;
1931         rpc_call_start(task);
1932 }
1933
1934 static const struct rpc_call_ops nfs4_close_ops = {
1935         .rpc_call_prepare = nfs4_close_prepare,
1936         .rpc_call_done = nfs4_close_done,
1937         .rpc_release = nfs4_free_closedata,
1938 };
1939
1940 /*
1941  * It is possible for data to be read/written from a mem-mapped file
1942  * after the sys_close call (which hits the vfs layer as a flush).
1943  * This means that we can't safely call nfsv4 close on a file until
1944  * the inode is cleared. This in turn means that we are not good
1945  * NFSv4 citizens - we do not indicate to the server to update the file's
1946  * share state even when we are done with one of the three share
1947  * stateid's in the inode.
1948  *
1949  * NOTE: Caller must be holding the sp->so_owner semaphore!
1950  */
1951 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1952 {
1953         struct nfs_server *server = NFS_SERVER(state->inode);
1954         struct nfs4_closedata *calldata;
1955         struct nfs4_state_owner *sp = state->owner;
1956         struct rpc_task *task;
1957         struct rpc_message msg = {
1958                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1959                 .rpc_cred = state->owner->so_cred,
1960         };
1961         struct rpc_task_setup task_setup_data = {
1962                 .rpc_client = server->client,
1963                 .rpc_message = &msg,
1964                 .callback_ops = &nfs4_close_ops,
1965                 .workqueue = nfsiod_workqueue,
1966                 .flags = RPC_TASK_ASYNC,
1967         };
1968         int status = -ENOMEM;
1969
1970         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1971         if (calldata == NULL)
1972                 goto out;
1973         calldata->inode = state->inode;
1974         calldata->state = state;
1975         calldata->arg.fh = NFS_FH(state->inode);
1976         calldata->arg.stateid = &state->open_stateid;
1977         /* Serialization for the sequence id */
1978         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1979         if (calldata->arg.seqid == NULL)
1980                 goto out_free_calldata;
1981         calldata->arg.fmode = 0;
1982         calldata->arg.bitmask = server->cache_consistency_bitmask;
1983         calldata->res.fattr = &calldata->fattr;
1984         calldata->res.seqid = calldata->arg.seqid;
1985         calldata->res.server = server;
1986         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1987         path_get(path);
1988         calldata->path = *path;
1989
1990         msg.rpc_argp = &calldata->arg,
1991         msg.rpc_resp = &calldata->res,
1992         task_setup_data.callback_data = calldata;
1993         task = rpc_run_task(&task_setup_data);
1994         if (IS_ERR(task))
1995                 return PTR_ERR(task);
1996         status = 0;
1997         if (wait)
1998                 status = rpc_wait_for_completion_task(task);
1999         rpc_put_task(task);
2000         return status;
2001 out_free_calldata:
2002         kfree(calldata);
2003 out:
2004         nfs4_put_open_state(state);
2005         nfs4_put_state_owner(sp);
2006         return status;
2007 }
2008
2009 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
2010 {
2011         struct file *filp;
2012         int ret;
2013
2014         /* If the open_intent is for execute, we have an extra check to make */
2015         if (fmode & FMODE_EXEC) {
2016                 ret = nfs_may_open(state->inode,
2017                                 state->owner->so_cred,
2018                                 nd->intent.open.flags);
2019                 if (ret < 0)
2020                         goto out_close;
2021         }
2022         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
2023         if (!IS_ERR(filp)) {
2024                 struct nfs_open_context *ctx;
2025                 ctx = nfs_file_open_context(filp);
2026                 ctx->state = state;
2027                 return 0;
2028         }
2029         ret = PTR_ERR(filp);
2030 out_close:
2031         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
2032         return ret;
2033 }
2034
2035 struct dentry *
2036 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2037 {
2038         struct path path = {
2039                 .mnt = nd->path.mnt,
2040                 .dentry = dentry,
2041         };
2042         struct dentry *parent;
2043         struct iattr attr;
2044         struct rpc_cred *cred;
2045         struct nfs4_state *state;
2046         struct dentry *res;
2047         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2048
2049         if (nd->flags & LOOKUP_CREATE) {
2050                 attr.ia_mode = nd->intent.open.create_mode;
2051                 attr.ia_valid = ATTR_MODE;
2052                 if (!IS_POSIXACL(dir))
2053                         attr.ia_mode &= ~current_umask();
2054         } else {
2055                 attr.ia_valid = 0;
2056                 BUG_ON(nd->intent.open.flags & O_CREAT);
2057         }
2058
2059         cred = rpc_lookup_cred();
2060         if (IS_ERR(cred))
2061                 return (struct dentry *)cred;
2062         parent = dentry->d_parent;
2063         /* Protect against concurrent sillydeletes */
2064         nfs_block_sillyrename(parent);
2065         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2066         put_rpccred(cred);
2067         if (IS_ERR(state)) {
2068                 if (PTR_ERR(state) == -ENOENT) {
2069                         d_add(dentry, NULL);
2070                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2071                 }
2072                 nfs_unblock_sillyrename(parent);
2073                 return (struct dentry *)state;
2074         }
2075         res = d_add_unique(dentry, igrab(state->inode));
2076         if (res != NULL)
2077                 path.dentry = res;
2078         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2079         nfs_unblock_sillyrename(parent);
2080         nfs4_intent_set_file(nd, &path, state, fmode);
2081         return res;
2082 }
2083
2084 int
2085 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2086 {
2087         struct path path = {
2088                 .mnt = nd->path.mnt,
2089                 .dentry = dentry,
2090         };
2091         struct rpc_cred *cred;
2092         struct nfs4_state *state;
2093         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2094
2095         cred = rpc_lookup_cred();
2096         if (IS_ERR(cred))
2097                 return PTR_ERR(cred);
2098         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2099         put_rpccred(cred);
2100         if (IS_ERR(state)) {
2101                 switch (PTR_ERR(state)) {
2102                         case -EPERM:
2103                         case -EACCES:
2104                         case -EDQUOT:
2105                         case -ENOSPC:
2106                         case -EROFS:
2107                                 return PTR_ERR(state);
2108                         default:
2109                                 goto out_drop;
2110                 }
2111         }
2112         if (state->inode == dentry->d_inode) {
2113                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2114                 nfs4_intent_set_file(nd, &path, state, fmode);
2115                 return 1;
2116         }
2117         nfs4_close_sync(&path, state, fmode);
2118 out_drop:
2119         d_drop(dentry);
2120         return 0;
2121 }
2122
2123 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2124 {
2125         if (ctx->state == NULL)
2126                 return;
2127         if (is_sync)
2128                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2129         else
2130                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2131 }
2132
2133 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2134 {
2135         struct nfs4_server_caps_arg args = {
2136                 .fhandle = fhandle,
2137         };
2138         struct nfs4_server_caps_res res = {};
2139         struct rpc_message msg = {
2140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2141                 .rpc_argp = &args,
2142                 .rpc_resp = &res,
2143         };
2144         int status;
2145
2146         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2147         if (status == 0) {
2148                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2149                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2150                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2151                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2152                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2153                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2154                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2155                         server->caps |= NFS_CAP_ACLS;
2156                 if (res.has_links != 0)
2157                         server->caps |= NFS_CAP_HARDLINKS;
2158                 if (res.has_symlinks != 0)
2159                         server->caps |= NFS_CAP_SYMLINKS;
2160                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2161                         server->caps |= NFS_CAP_FILEID;
2162                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2163                         server->caps |= NFS_CAP_MODE;
2164                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2165                         server->caps |= NFS_CAP_NLINK;
2166                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2167                         server->caps |= NFS_CAP_OWNER;
2168                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2169                         server->caps |= NFS_CAP_OWNER_GROUP;
2170                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2171                         server->caps |= NFS_CAP_ATIME;
2172                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2173                         server->caps |= NFS_CAP_CTIME;
2174                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2175                         server->caps |= NFS_CAP_MTIME;
2176
2177                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2178                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2179                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2180                 server->acl_bitmask = res.acl_bitmask;
2181         }
2182
2183         return status;
2184 }
2185
2186 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2187 {
2188         struct nfs4_exception exception = { };
2189         int err;
2190         do {
2191                 err = nfs4_handle_exception(server,
2192                                 _nfs4_server_capabilities(server, fhandle),
2193                                 &exception);
2194         } while (exception.retry);
2195         return err;
2196 }
2197
2198 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2199                 struct nfs_fsinfo *info)
2200 {
2201         struct nfs4_lookup_root_arg args = {
2202                 .bitmask = nfs4_fattr_bitmap,
2203         };
2204         struct nfs4_lookup_res res = {
2205                 .server = server,
2206                 .fattr = info->fattr,
2207                 .fh = fhandle,
2208         };
2209         struct rpc_message msg = {
2210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2211                 .rpc_argp = &args,
2212                 .rpc_resp = &res,
2213         };
2214
2215         nfs_fattr_init(info->fattr);
2216         return nfs4_call_sync(server, &msg, &args, &res, 0);
2217 }
2218
2219 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2220                 struct nfs_fsinfo *info)
2221 {
2222         struct nfs4_exception exception = { };
2223         int err;
2224         do {
2225                 err = nfs4_handle_exception(server,
2226                                 _nfs4_lookup_root(server, fhandle, info),
2227                                 &exception);
2228         } while (exception.retry);
2229         return err;
2230 }
2231
2232 /*
2233  * get the file handle for the "/" directory on the server
2234  */
2235 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2236                               struct nfs_fsinfo *info)
2237 {
2238         int status;
2239
2240         status = nfs4_lookup_root(server, fhandle, info);
2241         if (status == 0)
2242                 status = nfs4_server_capabilities(server, fhandle);
2243         if (status == 0)
2244                 status = nfs4_do_fsinfo(server, fhandle, info);
2245         return nfs4_map_errors(status);
2246 }
2247
2248 /*
2249  * Get locations and (maybe) other attributes of a referral.
2250  * Note that we'll actually follow the referral later when
2251  * we detect fsid mismatch in inode revalidation
2252  */
2253 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2254 {
2255         int status = -ENOMEM;
2256         struct page *page = NULL;
2257         struct nfs4_fs_locations *locations = NULL;
2258
2259         page = alloc_page(GFP_KERNEL);
2260         if (page == NULL)
2261                 goto out;
2262         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2263         if (locations == NULL)
2264                 goto out;
2265
2266         status = nfs4_proc_fs_locations(dir, name, locations, page);
2267         if (status != 0)
2268                 goto out;
2269         /* Make sure server returned a different fsid for the referral */
2270         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2271                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2272                 status = -EIO;
2273                 goto out;
2274         }
2275
2276         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2277         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2278         if (!fattr->mode)
2279                 fattr->mode = S_IFDIR;
2280         memset(fhandle, 0, sizeof(struct nfs_fh));
2281 out:
2282         if (page)
2283                 __free_page(page);
2284         if (locations)
2285                 kfree(locations);
2286         return status;
2287 }
2288
2289 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2290 {
2291         struct nfs4_getattr_arg args = {
2292                 .fh = fhandle,
2293                 .bitmask = server->attr_bitmask,
2294         };
2295         struct nfs4_getattr_res res = {
2296                 .fattr = fattr,
2297                 .server = server,
2298         };
2299         struct rpc_message msg = {
2300                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2301                 .rpc_argp = &args,
2302                 .rpc_resp = &res,
2303         };
2304
2305         nfs_fattr_init(fattr);
2306         return nfs4_call_sync(server, &msg, &args, &res, 0);
2307 }
2308
2309 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2310 {
2311         struct nfs4_exception exception = { };
2312         int err;
2313         do {
2314                 err = nfs4_handle_exception(server,
2315                                 _nfs4_proc_getattr(server, fhandle, fattr),
2316                                 &exception);
2317         } while (exception.retry);
2318         return err;
2319 }
2320
2321 /*
2322  * The file is not closed if it is opened due to the a request to change
2323  * the size of the file. The open call will not be needed once the
2324  * VFS layer lookup-intents are implemented.
2325  *
2326  * Close is called when the inode is destroyed.
2327  * If we haven't opened the file for O_WRONLY, we
2328  * need to in the size_change case to obtain a stateid.
2329  *
2330  * Got race?
2331  * Because OPEN is always done by name in nfsv4, it is
2332  * possible that we opened a different file by the same
2333  * name.  We can recognize this race condition, but we
2334  * can't do anything about it besides returning an error.
2335  *
2336  * This will be fixed with VFS changes (lookup-intent).
2337  */
2338 static int
2339 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2340                   struct iattr *sattr)
2341 {
2342         struct inode *inode = dentry->d_inode;
2343         struct rpc_cred *cred = NULL;
2344         struct nfs4_state *state = NULL;
2345         int status;
2346
2347         nfs_fattr_init(fattr);
2348
2349         /* Search for an existing open(O_WRITE) file */
2350         if (sattr->ia_valid & ATTR_FILE) {
2351                 struct nfs_open_context *ctx;
2352
2353                 ctx = nfs_file_open_context(sattr->ia_file);
2354                 if (ctx) {
2355                         cred = ctx->cred;
2356                         state = ctx->state;
2357                 }
2358         }
2359
2360         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2361         if (status == 0)
2362                 nfs_setattr_update_inode(inode, sattr);
2363         return status;
2364 }
2365
2366 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2367                 const struct qstr *name, struct nfs_fh *fhandle,
2368                 struct nfs_fattr *fattr)
2369 {
2370         int                    status;
2371         struct nfs4_lookup_arg args = {
2372                 .bitmask = server->attr_bitmask,
2373                 .dir_fh = dirfh,
2374                 .name = name,
2375         };
2376         struct nfs4_lookup_res res = {
2377                 .server = server,
2378                 .fattr = fattr,
2379                 .fh = fhandle,
2380         };
2381         struct rpc_message msg = {
2382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2383                 .rpc_argp = &args,
2384                 .rpc_resp = &res,
2385         };
2386
2387         nfs_fattr_init(fattr);
2388
2389         dprintk("NFS call  lookupfh %s\n", name->name);
2390         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2391         dprintk("NFS reply lookupfh: %d\n", status);
2392         return status;
2393 }
2394
2395 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2396                               struct qstr *name, struct nfs_fh *fhandle,
2397                               struct nfs_fattr *fattr)
2398 {
2399         struct nfs4_exception exception = { };
2400         int err;
2401         do {
2402                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2403                 /* FIXME: !!!! */
2404                 if (err == -NFS4ERR_MOVED) {
2405                         err = -EREMOTE;
2406                         break;
2407                 }
2408                 err = nfs4_handle_exception(server, err, &exception);
2409         } while (exception.retry);
2410         return err;
2411 }
2412
2413 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2414                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2415 {
2416         int status;
2417
2418         dprintk("NFS call  lookup %s\n", name->name);
2419         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2420         if (status == -NFS4ERR_MOVED)
2421                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2422         dprintk("NFS reply lookup: %d\n", status);
2423         return status;
2424 }
2425
2426 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2427 {
2428         struct nfs4_exception exception = { };
2429         int err;
2430         do {
2431                 err = nfs4_handle_exception(NFS_SERVER(dir),
2432                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2433                                 &exception);
2434         } while (exception.retry);
2435         return err;
2436 }
2437
2438 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2439 {
2440         struct nfs_server *server = NFS_SERVER(inode);
2441         struct nfs4_accessargs args = {
2442                 .fh = NFS_FH(inode),
2443                 .bitmask = server->attr_bitmask,
2444         };
2445         struct nfs4_accessres res = {
2446                 .server = server,
2447         };
2448         struct rpc_message msg = {
2449                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2450                 .rpc_argp = &args,
2451                 .rpc_resp = &res,
2452                 .rpc_cred = entry->cred,
2453         };
2454         int mode = entry->mask;
2455         int status;
2456
2457         /*
2458          * Determine which access bits we want to ask for...
2459          */
2460         if (mode & MAY_READ)
2461                 args.access |= NFS4_ACCESS_READ;
2462         if (S_ISDIR(inode->i_mode)) {
2463                 if (mode & MAY_WRITE)
2464                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2465                 if (mode & MAY_EXEC)
2466                         args.access |= NFS4_ACCESS_LOOKUP;
2467         } else {
2468                 if (mode & MAY_WRITE)
2469                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2470                 if (mode & MAY_EXEC)
2471                         args.access |= NFS4_ACCESS_EXECUTE;
2472         }
2473
2474         res.fattr = nfs_alloc_fattr();
2475         if (res.fattr == NULL)
2476                 return -ENOMEM;
2477
2478         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2479         if (!status) {
2480                 entry->mask = 0;
2481                 if (res.access & NFS4_ACCESS_READ)
2482                         entry->mask |= MAY_READ;
2483                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2484                         entry->mask |= MAY_WRITE;
2485                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2486                         entry->mask |= MAY_EXEC;
2487                 nfs_refresh_inode(inode, res.fattr);
2488         }
2489         nfs_free_fattr(res.fattr);
2490         return status;
2491 }
2492
2493 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2494 {
2495         struct nfs4_exception exception = { };
2496         int err;
2497         do {
2498                 err = nfs4_handle_exception(NFS_SERVER(inode),
2499                                 _nfs4_proc_access(inode, entry),
2500                                 &exception);
2501         } while (exception.retry);
2502         return err;
2503 }
2504
2505 /*
2506  * TODO: For the time being, we don't try to get any attributes
2507  * along with any of the zero-copy operations READ, READDIR,
2508  * READLINK, WRITE.
2509  *
2510  * In the case of the first three, we want to put the GETATTR
2511  * after the read-type operation -- this is because it is hard
2512  * to predict the length of a GETATTR response in v4, and thus
2513  * align the READ data correctly.  This means that the GETATTR
2514  * may end up partially falling into the page cache, and we should
2515  * shift it into the 'tail' of the xdr_buf before processing.
2516  * To do this efficiently, we need to know the total length
2517  * of data received, which doesn't seem to be available outside
2518  * of the RPC layer.
2519  *
2520  * In the case of WRITE, we also want to put the GETATTR after
2521  * the operation -- in this case because we want to make sure
2522  * we get the post-operation mtime and size.  This means that
2523  * we can't use xdr_encode_pages() as written: we need a variant
2524  * of it which would leave room in the 'tail' iovec.
2525  *
2526  * Both of these changes to the XDR layer would in fact be quite
2527  * minor, but I decided to leave them for a subsequent patch.
2528  */
2529 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2530                 unsigned int pgbase, unsigned int pglen)
2531 {
2532         struct nfs4_readlink args = {
2533                 .fh       = NFS_FH(inode),
2534                 .pgbase   = pgbase,
2535                 .pglen    = pglen,
2536                 .pages    = &page,
2537         };
2538         struct nfs4_readlink_res res;
2539         struct rpc_message msg = {
2540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2541                 .rpc_argp = &args,
2542                 .rpc_resp = &res,
2543         };
2544
2545         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2546 }
2547
2548 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2549                 unsigned int pgbase, unsigned int pglen)
2550 {
2551         struct nfs4_exception exception = { };
2552         int err;
2553         do {
2554                 err = nfs4_handle_exception(NFS_SERVER(inode),
2555                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2556                                 &exception);
2557         } while (exception.retry);
2558         return err;
2559 }
2560
2561 /*
2562  * Got race?
2563  * We will need to arrange for the VFS layer to provide an atomic open.
2564  * Until then, this create/open method is prone to inefficiency and race
2565  * conditions due to the lookup, create, and open VFS calls from sys_open()
2566  * placed on the wire.
2567  *
2568  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2569  * The file will be opened again in the subsequent VFS open call
2570  * (nfs4_proc_file_open).
2571  *
2572  * The open for read will just hang around to be used by any process that
2573  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2574  */
2575
2576 static int
2577 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2578                  int flags, struct nameidata *nd)
2579 {
2580         struct path path = {
2581                 .mnt = nd->path.mnt,
2582                 .dentry = dentry,
2583         };
2584         struct nfs4_state *state;
2585         struct rpc_cred *cred;
2586         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2587         int status = 0;
2588
2589         cred = rpc_lookup_cred();
2590         if (IS_ERR(cred)) {
2591                 status = PTR_ERR(cred);
2592                 goto out;
2593         }
2594         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2595         d_drop(dentry);
2596         if (IS_ERR(state)) {
2597                 status = PTR_ERR(state);
2598                 goto out_putcred;
2599         }
2600         d_add(dentry, igrab(state->inode));
2601         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2602         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2603                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2604         else
2605                 nfs4_close_sync(&path, state, fmode);
2606 out_putcred:
2607         put_rpccred(cred);
2608 out:
2609         return status;
2610 }
2611
2612 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2613 {
2614         struct nfs_server *server = NFS_SERVER(dir);
2615         struct nfs_removeargs args = {
2616                 .fh = NFS_FH(dir),
2617                 .name.len = name->len,
2618                 .name.name = name->name,
2619                 .bitmask = server->attr_bitmask,
2620         };
2621         struct nfs_removeres res = {
2622                 .server = server,
2623         };
2624         struct rpc_message msg = {
2625                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2626                 .rpc_argp = &args,
2627                 .rpc_resp = &res,
2628         };
2629         int status = -ENOMEM;
2630
2631         res.dir_attr = nfs_alloc_fattr();
2632         if (res.dir_attr == NULL)
2633                 goto out;
2634
2635         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2636         if (status == 0) {
2637                 update_changeattr(dir, &res.cinfo);
2638                 nfs_post_op_update_inode(dir, res.dir_attr);
2639         }
2640         nfs_free_fattr(res.dir_attr);
2641 out:
2642         return status;
2643 }
2644
2645 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2646 {
2647         struct nfs4_exception exception = { };
2648         int err;
2649         do {
2650                 err = nfs4_handle_exception(NFS_SERVER(dir),
2651                                 _nfs4_proc_remove(dir, name),
2652                                 &exception);
2653         } while (exception.retry);
2654         return err;
2655 }
2656
2657 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2658 {
2659         struct nfs_server *server = NFS_SERVER(dir);
2660         struct nfs_removeargs *args = msg->rpc_argp;
2661         struct nfs_removeres *res = msg->rpc_resp;
2662
2663         args->bitmask = server->cache_consistency_bitmask;
2664         res->server = server;
2665         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2666 }
2667
2668 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2669 {
2670         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2671
2672         if (!nfs4_sequence_done(task, &res->seq_res))
2673                 return 0;
2674         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2675                 return 0;
2676         update_changeattr(dir, &res->cinfo);
2677         nfs_post_op_update_inode(dir, res->dir_attr);
2678         return 1;
2679 }
2680
2681 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2682                 struct inode *new_dir, struct qstr *new_name)
2683 {
2684         struct nfs_server *server = NFS_SERVER(old_dir);
2685         struct nfs4_rename_arg arg = {
2686                 .old_dir = NFS_FH(old_dir),
2687                 .new_dir = NFS_FH(new_dir),
2688                 .old_name = old_name,
2689                 .new_name = new_name,
2690                 .bitmask = server->attr_bitmask,
2691         };
2692         struct nfs4_rename_res res = {
2693                 .server = server,
2694         };
2695         struct rpc_message msg = {
2696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2697                 .rpc_argp = &arg,
2698                 .rpc_resp = &res,
2699         };
2700         int status = -ENOMEM;
2701
2702         res.old_fattr = nfs_alloc_fattr();
2703         res.new_fattr = nfs_alloc_fattr();
2704         if (res.old_fattr == NULL || res.new_fattr == NULL)
2705                 goto out;
2706
2707         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2708         if (!status) {
2709                 update_changeattr(old_dir, &res.old_cinfo);
2710                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2711                 update_changeattr(new_dir, &res.new_cinfo);
2712                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2713         }
2714 out:
2715         nfs_free_fattr(res.new_fattr);
2716         nfs_free_fattr(res.old_fattr);
2717         return status;
2718 }
2719
2720 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2721                 struct inode *new_dir, struct qstr *new_name)
2722 {
2723         struct nfs4_exception exception = { };
2724         int err;
2725         do {
2726                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2727                                 _nfs4_proc_rename(old_dir, old_name,
2728                                         new_dir, new_name),
2729                                 &exception);
2730         } while (exception.retry);
2731         return err;
2732 }
2733
2734 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2735 {
2736         struct nfs_server *server = NFS_SERVER(inode);
2737         struct nfs4_link_arg arg = {
2738                 .fh     = NFS_FH(inode),
2739                 .dir_fh = NFS_FH(dir),
2740                 .name   = name,
2741                 .bitmask = server->attr_bitmask,
2742         };
2743         struct nfs4_link_res res = {
2744                 .server = server,
2745         };
2746         struct rpc_message msg = {
2747                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2748                 .rpc_argp = &arg,
2749                 .rpc_resp = &res,
2750         };
2751         int status = -ENOMEM;
2752
2753         res.fattr = nfs_alloc_fattr();
2754         res.dir_attr = nfs_alloc_fattr();
2755         if (res.fattr == NULL || res.dir_attr == NULL)
2756                 goto out;
2757
2758         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2759         if (!status) {
2760                 update_changeattr(dir, &res.cinfo);
2761                 nfs_post_op_update_inode(dir, res.dir_attr);
2762                 nfs_post_op_update_inode(inode, res.fattr);
2763         }
2764 out:
2765         nfs_free_fattr(res.dir_attr);
2766         nfs_free_fattr(res.fattr);
2767         return status;
2768 }
2769
2770 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2771 {
2772         struct nfs4_exception exception = { };
2773         int err;
2774         do {
2775                 err = nfs4_handle_exception(NFS_SERVER(inode),
2776                                 _nfs4_proc_link(inode, dir, name),
2777                                 &exception);
2778         } while (exception.retry);
2779         return err;
2780 }
2781
2782 struct nfs4_createdata {
2783         struct rpc_message msg;
2784         struct nfs4_create_arg arg;
2785         struct nfs4_create_res res;
2786         struct nfs_fh fh;
2787         struct nfs_fattr fattr;
2788         struct nfs_fattr dir_fattr;
2789 };
2790
2791 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2792                 struct qstr *name, struct iattr *sattr, u32 ftype)
2793 {
2794         struct nfs4_createdata *data;
2795
2796         data = kzalloc(sizeof(*data), GFP_KERNEL);
2797         if (data != NULL) {
2798                 struct nfs_server *server = NFS_SERVER(dir);
2799
2800                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2801                 data->msg.rpc_argp = &data->arg;
2802                 data->msg.rpc_resp = &data->res;
2803                 data->arg.dir_fh = NFS_FH(dir);
2804                 data->arg.server = server;
2805                 data->arg.name = name;
2806                 data->arg.attrs = sattr;
2807                 data->arg.ftype = ftype;
2808                 data->arg.bitmask = server->attr_bitmask;
2809                 data->res.server = server;
2810                 data->res.fh = &data->fh;
2811                 data->res.fattr = &data->fattr;
2812                 data->res.dir_fattr = &data->dir_fattr;
2813                 nfs_fattr_init(data->res.fattr);
2814                 nfs_fattr_init(data->res.dir_fattr);
2815         }
2816         return data;
2817 }
2818
2819 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2820 {
2821         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2822                                     &data->arg, &data->res, 1);
2823         if (status == 0) {
2824                 update_changeattr(dir, &data->res.dir_cinfo);
2825                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2826                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2827         }
2828         return status;
2829 }
2830
2831 static void nfs4_free_createdata(struct nfs4_createdata *data)
2832 {
2833         kfree(data);
2834 }
2835
2836 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2837                 struct page *page, unsigned int len, struct iattr *sattr)
2838 {
2839         struct nfs4_createdata *data;
2840         int status = -ENAMETOOLONG;
2841
2842         if (len > NFS4_MAXPATHLEN)
2843                 goto out;
2844
2845         status = -ENOMEM;
2846         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2847         if (data == NULL)
2848                 goto out;
2849
2850         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2851         data->arg.u.symlink.pages = &page;
2852         data->arg.u.symlink.len = len;
2853
2854         status = nfs4_do_create(dir, dentry, data);
2855
2856         nfs4_free_createdata(data);
2857 out:
2858         return status;
2859 }
2860
2861 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2862                 struct page *page, unsigned int len, struct iattr *sattr)
2863 {
2864         struct nfs4_exception exception = { };
2865         int err;
2866         do {
2867                 err = nfs4_handle_exception(NFS_SERVER(dir),
2868                                 _nfs4_proc_symlink(dir, dentry, page,
2869                                                         len, sattr),
2870                                 &exception);
2871         } while (exception.retry);
2872         return err;
2873 }
2874
2875 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2876                 struct iattr *sattr)
2877 {
2878         struct nfs4_createdata *data;
2879         int status = -ENOMEM;
2880
2881         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2882         if (data == NULL)
2883                 goto out;
2884
2885         status = nfs4_do_create(dir, dentry, data);
2886
2887         nfs4_free_createdata(data);
2888 out:
2889         return status;
2890 }
2891
2892 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2893                 struct iattr *sattr)
2894 {
2895         struct nfs4_exception exception = { };
2896         int err;
2897         do {
2898                 err = nfs4_handle_exception(NFS_SERVER(dir),
2899                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2900                                 &exception);
2901         } while (exception.retry);
2902         return err;
2903 }
2904
2905 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2906                   u64 cookie, struct page *page, unsigned int count, int plus)
2907 {
2908         struct inode            *dir = dentry->d_inode;
2909         struct nfs4_readdir_arg args = {
2910                 .fh = NFS_FH(dir),
2911                 .pages = &page,
2912                 .pgbase = 0,
2913                 .count = count,
2914                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2915         };
2916         struct nfs4_readdir_res res;
2917         struct rpc_message msg = {
2918                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2919                 .rpc_argp = &args,
2920                 .rpc_resp = &res,
2921                 .rpc_cred = cred,
2922         };
2923         int                     status;
2924
2925         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2926                         dentry->d_parent->d_name.name,
2927                         dentry->d_name.name,
2928                         (unsigned long long)cookie);
2929         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2930         res.pgbase = args.pgbase;
2931         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2932         if (status == 0)
2933                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2934
2935         nfs_invalidate_atime(dir);
2936
2937         dprintk("%s: returns %d\n", __func__, status);
2938         return status;
2939 }
2940
2941 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2942                   u64 cookie, struct page *page, unsigned int count, int plus)
2943 {
2944         struct nfs4_exception exception = { };
2945         int err;
2946         do {
2947                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2948                                 _nfs4_proc_readdir(dentry, cred, cookie,
2949                                         page, count, plus),
2950                                 &exception);
2951         } while (exception.retry);
2952         return err;
2953 }
2954
2955 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2956                 struct iattr *sattr, dev_t rdev)
2957 {
2958         struct nfs4_createdata *data;
2959         int mode = sattr->ia_mode;
2960         int status = -ENOMEM;
2961
2962         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2963         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2964
2965         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2966         if (data == NULL)
2967                 goto out;
2968
2969         if (S_ISFIFO(mode))
2970                 data->arg.ftype = NF4FIFO;
2971         else if (S_ISBLK(mode)) {
2972                 data->arg.ftype = NF4BLK;
2973                 data->arg.u.device.specdata1 = MAJOR(rdev);
2974                 data->arg.u.device.specdata2 = MINOR(rdev);
2975         }
2976         else if (S_ISCHR(mode)) {
2977                 data->arg.ftype = NF4CHR;
2978                 data->arg.u.device.specdata1 = MAJOR(rdev);
2979                 data->arg.u.device.specdata2 = MINOR(rdev);
2980         }
2981
2982         status = nfs4_do_create(dir, dentry, data);
2983
2984         nfs4_free_createdata(data);
2985 out:
2986         return status;
2987 }
2988
2989 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2990                 struct iattr *sattr, dev_t rdev)
2991 {
2992         struct nfs4_exception exception = { };
2993         int err;
2994         do {
2995                 err = nfs4_handle_exception(NFS_SERVER(dir),
2996                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2997                                 &exception);
2998         } while (exception.retry);
2999         return err;
3000 }
3001
3002 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3003                  struct nfs_fsstat *fsstat)
3004 {
3005         struct nfs4_statfs_arg args = {
3006                 .fh = fhandle,
3007                 .bitmask = server->attr_bitmask,
3008         };
3009         struct nfs4_statfs_res res = {
3010                 .fsstat = fsstat,
3011         };
3012         struct rpc_message msg = {
3013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3014                 .rpc_argp = &args,
3015                 .rpc_resp = &res,
3016         };
3017
3018         nfs_fattr_init(fsstat->fattr);
3019         return  nfs4_call_sync(server, &msg, &args, &res, 0);
3020 }
3021
3022 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3023 {
3024         struct nfs4_exception exception = { };
3025         int err;
3026         do {
3027                 err = nfs4_handle_exception(server,
3028                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3029                                 &exception);
3030         } while (exception.retry);
3031         return err;
3032 }
3033
3034 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3035                 struct nfs_fsinfo *fsinfo)
3036 {
3037         struct nfs4_fsinfo_arg args = {
3038                 .fh = fhandle,
3039                 .bitmask = server->attr_bitmask,
3040         };
3041         struct nfs4_fsinfo_res res = {
3042                 .fsinfo = fsinfo,
3043         };
3044         struct rpc_message msg = {
3045                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3046                 .rpc_argp = &args,
3047                 .rpc_resp = &res,
3048         };
3049
3050         return nfs4_call_sync(server, &msg, &args, &res, 0);
3051 }
3052
3053 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3054 {
3055         struct nfs4_exception exception = { };
3056         int err;
3057
3058         do {
3059                 err = nfs4_handle_exception(server,
3060                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3061                                 &exception);
3062         } while (exception.retry);
3063         return err;
3064 }
3065
3066 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3067 {
3068         nfs_fattr_init(fsinfo->fattr);
3069         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3070 }
3071
3072 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3073                 struct nfs_pathconf *pathconf)
3074 {
3075         struct nfs4_pathconf_arg args = {
3076                 .fh = fhandle,
3077                 .bitmask = server->attr_bitmask,
3078         };
3079         struct nfs4_pathconf_res res = {
3080                 .pathconf = pathconf,
3081         };
3082         struct rpc_message msg = {
3083                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3084                 .rpc_argp = &args,
3085                 .rpc_resp = &res,
3086         };
3087
3088         /* None of the pathconf attributes are mandatory to implement */
3089         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3090                 memset(pathconf, 0, sizeof(*pathconf));
3091                 return 0;
3092         }
3093
3094         nfs_fattr_init(pathconf->fattr);
3095         return nfs4_call_sync(server, &msg, &args, &res, 0);
3096 }
3097
3098 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3099                 struct nfs_pathconf *pathconf)
3100 {
3101         struct nfs4_exception exception = { };
3102         int err;
3103
3104         do {
3105                 err = nfs4_handle_exception(server,
3106                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3107                                 &exception);
3108         } while (exception.retry);
3109         return err;
3110 }
3111
3112 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3113 {
3114         struct nfs_server *server = NFS_SERVER(data->inode);
3115
3116         dprintk("--> %s\n", __func__);
3117
3118         if (!nfs4_sequence_done(task, &data->res.seq_res))
3119                 return -EAGAIN;
3120
3121         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3122                 nfs_restart_rpc(task, server->nfs_client);
3123                 return -EAGAIN;
3124         }
3125
3126         nfs_invalidate_atime(data->inode);
3127         if (task->tk_status > 0)
3128                 renew_lease(server, data->timestamp);
3129         return 0;
3130 }
3131
3132 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3133 {
3134         data->timestamp   = jiffies;
3135         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3136 }
3137
3138 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3139 {
3140         struct inode *inode = data->inode;
3141
3142         if (!nfs4_sequence_done(task, &data->res.seq_res))
3143                 return -EAGAIN;
3144
3145         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3146                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3147                 return -EAGAIN;
3148         }
3149         if (task->tk_status >= 0) {
3150                 renew_lease(NFS_SERVER(inode), data->timestamp);
3151                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3152         }
3153         return 0;
3154 }
3155
3156 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3157 {
3158         struct nfs_server *server = NFS_SERVER(data->inode);
3159
3160         data->args.bitmask = server->cache_consistency_bitmask;
3161         data->res.server = server;
3162         data->timestamp   = jiffies;
3163
3164         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3165 }
3166
3167 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3168 {
3169         struct inode *inode = data->inode;
3170
3171         if (!nfs4_sequence_done(task, &data->res.seq_res))
3172                 return -EAGAIN;
3173
3174         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3175                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3176                 return -EAGAIN;
3177         }
3178         nfs_refresh_inode(inode, data->res.fattr);
3179         return 0;
3180 }
3181
3182 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3183 {
3184         struct nfs_server *server = NFS_SERVER(data->inode);
3185
3186         data->args.bitmask = server->cache_consistency_bitmask;
3187         data->res.server = server;
3188         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3189 }
3190
3191 struct nfs4_renewdata {
3192         struct nfs_client       *client;
3193         unsigned long           timestamp;
3194 };
3195
3196 /*
3197  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3198  * standalone procedure for queueing an asynchronous RENEW.
3199  */
3200 static void nfs4_renew_release(void *calldata)
3201 {
3202         struct nfs4_renewdata *data = calldata;
3203         struct nfs_client *clp = data->client;
3204
3205         if (atomic_read(&clp->cl_count) > 1)
3206                 nfs4_schedule_state_renewal(clp);
3207         nfs_put_client(clp);
3208         kfree(data);
3209 }
3210
3211 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3212 {
3213         struct nfs4_renewdata *data = calldata;
3214         struct nfs_client *clp = data->client;
3215         unsigned long timestamp = data->timestamp;
3216
3217         if (task->tk_status < 0) {
3218                 /* Unless we're shutting down, schedule state recovery! */
3219                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3220                         nfs4_schedule_state_recovery(clp);
3221                 return;
3222         }
3223         do_renew_lease(clp, timestamp);
3224 }
3225
3226 static const struct rpc_call_ops nfs4_renew_ops = {
3227         .rpc_call_done = nfs4_renew_done,
3228         .rpc_release = nfs4_renew_release,
3229 };
3230
3231 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3232 {
3233         struct rpc_message msg = {
3234                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3235                 .rpc_argp       = clp,
3236                 .rpc_cred       = cred,
3237         };
3238         struct nfs4_renewdata *data;
3239
3240         if (!atomic_inc_not_zero(&clp->cl_count))
3241                 return -EIO;
3242         data = kmalloc(sizeof(*data), GFP_KERNEL);
3243         if (data == NULL)
3244                 return -ENOMEM;
3245         data->client = clp;
3246         data->timestamp = jiffies;
3247         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3248                         &nfs4_renew_ops, data);
3249 }
3250
3251 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3252 {
3253         struct rpc_message msg = {
3254                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3255                 .rpc_argp       = clp,
3256                 .rpc_cred       = cred,
3257         };
3258         unsigned long now = jiffies;
3259         int status;
3260
3261         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3262         if (status < 0)
3263                 return status;
3264         do_renew_lease(clp, now);
3265         return 0;
3266 }
3267
3268 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3269 {
3270         return (server->caps & NFS_CAP_ACLS)
3271                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3272                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3273 }
3274
3275 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3276  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3277  * the stack.
3278  */
3279 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3280
3281 static void buf_to_pages(const void *buf, size_t buflen,
3282                 struct page **pages, unsigned int *pgbase)
3283 {
3284         const void *p = buf;
3285
3286         *pgbase = offset_in_page(buf);
3287         p -= *pgbase;
3288         while (p < buf + buflen) {
3289                 *(pages++) = virt_to_page(p);
3290                 p += PAGE_CACHE_SIZE;
3291         }
3292 }
3293
3294 struct nfs4_cached_acl {
3295         int cached;
3296         size_t len;
3297         char data[0];
3298 };
3299
3300 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3301 {
3302         struct nfs_inode *nfsi = NFS_I(inode);
3303
3304         spin_lock(&inode->i_lock);
3305         kfree(nfsi->nfs4_acl);
3306         nfsi->nfs4_acl = acl;
3307         spin_unlock(&inode->i_lock);
3308 }
3309
3310 static void nfs4_zap_acl_attr(struct inode *inode)
3311 {
3312         nfs4_set_cached_acl(inode, NULL);
3313 }
3314
3315 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3316 {
3317         struct nfs_inode *nfsi = NFS_I(inode);
3318         struct nfs4_cached_acl *acl;
3319         int ret = -ENOENT;
3320
3321         spin_lock(&inode->i_lock);
3322         acl = nfsi->nfs4_acl;
3323         if (acl == NULL)
3324                 goto out;
3325         if (buf == NULL) /* user is just asking for length */
3326                 goto out_len;
3327         if (acl->cached == 0)
3328                 goto out;
3329         ret = -ERANGE; /* see getxattr(2) man page */
3330         if (acl->len > buflen)
3331                 goto out;
3332         memcpy(buf, acl->data, acl->len);
3333 out_len:
3334         ret = acl->len;
3335 out:
3336         spin_unlock(&inode->i_lock);
3337         return ret;
3338 }
3339
3340 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3341 {
3342         struct nfs4_cached_acl *acl;
3343
3344         if (buf && acl_len <= PAGE_SIZE) {
3345                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3346                 if (acl == NULL)
3347                         goto out;
3348                 acl->cached = 1;
3349                 memcpy(acl->data, buf, acl_len);
3350         } else {
3351                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3352                 if (acl == NULL)
3353                         goto out;
3354                 acl->cached = 0;
3355         }
3356         acl->len = acl_len;
3357 out:
3358         nfs4_set_cached_acl(inode, acl);
3359 }
3360
3361 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3362 {
3363         struct page *pages[NFS4ACL_MAXPAGES];
3364         struct nfs_getaclargs args = {
3365                 .fh = NFS_FH(inode),
3366                 .acl_pages = pages,
3367                 .acl_len = buflen,
3368         };
3369         struct nfs_getaclres res = {
3370                 .acl_len = buflen,
3371         };
3372         void *resp_buf;
3373         struct rpc_message msg = {
3374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3375                 .rpc_argp = &args,
3376                 .rpc_resp = &res,
3377         };
3378         struct page *localpage = NULL;
3379         int ret;
3380
3381         if (buflen < PAGE_SIZE) {
3382                 /* As long as we're doing a round trip to the server anyway,
3383                  * let's be prepared for a page of acl data. */
3384                 localpage = alloc_page(GFP_KERNEL);
3385                 resp_buf = page_address(localpage);
3386                 if (localpage == NULL)
3387                         return -ENOMEM;
3388                 args.acl_pages[0] = localpage;
3389                 args.acl_pgbase = 0;
3390                 args.acl_len = PAGE_SIZE;
3391         } else {
3392                 resp_buf = buf;
3393                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3394         }
3395         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3396         if (ret)
3397                 goto out_free;
3398         if (res.acl_len > args.acl_len)
3399                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3400         else
3401                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3402         if (buf) {
3403                 ret = -ERANGE;
3404                 if (res.acl_len > buflen)
3405                         goto out_free;
3406                 if (localpage)
3407                         memcpy(buf, resp_buf, res.acl_len);
3408         }
3409         ret = res.acl_len;
3410 out_free:
3411         if (localpage)
3412                 __free_page(localpage);
3413         return ret;
3414 }
3415
3416 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3417 {
3418         struct nfs4_exception exception = { };
3419         ssize_t ret;
3420         do {
3421                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3422                 if (ret >= 0)
3423                         break;
3424                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3425         } while (exception.retry);
3426         return ret;
3427 }
3428
3429 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3430 {
3431         struct nfs_server *server = NFS_SERVER(inode);
3432         int ret;
3433
3434         if (!nfs4_server_supports_acls(server))
3435                 return -EOPNOTSUPP;
3436         ret = nfs_revalidate_inode(server, inode);
3437         if (ret < 0)
3438                 return ret;
3439         ret = nfs4_read_cached_acl(inode, buf, buflen);
3440         if (ret != -ENOENT)
3441                 return ret;
3442         return nfs4_get_acl_uncached(inode, buf, buflen);
3443 }
3444
3445 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3446 {
3447         struct nfs_server *server = NFS_SERVER(inode);
3448         struct page *pages[NFS4ACL_MAXPAGES];
3449         struct nfs_setaclargs arg = {
3450                 .fh             = NFS_FH(inode),
3451                 .acl_pages      = pages,
3452                 .acl_len        = buflen,
3453         };
3454         struct nfs_setaclres res;
3455         struct rpc_message msg = {
3456                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3457                 .rpc_argp       = &arg,
3458                 .rpc_resp       = &res,
3459         };
3460         int ret;
3461
3462         if (!nfs4_server_supports_acls(server))
3463                 return -EOPNOTSUPP;
3464         nfs_inode_return_delegation(inode);
3465         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3466         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3467         nfs_access_zap_cache(inode);
3468         nfs_zap_acl_cache(inode);
3469         return ret;
3470 }
3471
3472 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3473 {
3474         struct nfs4_exception exception = { };
3475         int err;
3476         do {
3477                 err = nfs4_handle_exception(NFS_SERVER(inode),
3478                                 __nfs4_proc_set_acl(inode, buf, buflen),
3479                                 &exception);
3480         } while (exception.retry);
3481         return err;
3482 }
3483
3484 static int
3485 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3486 {
3487         struct nfs_client *clp = server->nfs_client;
3488
3489         if (task->tk_status >= 0)
3490                 return 0;
3491         switch(task->tk_status) {
3492                 case -NFS4ERR_ADMIN_REVOKED:
3493                 case -NFS4ERR_BAD_STATEID:
3494                 case -NFS4ERR_OPENMODE:
3495                         if (state == NULL)
3496                                 break;
3497                         nfs4_state_mark_reclaim_nograce(clp, state);
3498                         goto do_state_recovery;
3499                 case -NFS4ERR_STALE_STATEID:
3500                         if (state == NULL)
3501                                 break;
3502                         nfs4_state_mark_reclaim_reboot(clp, state);
3503                 case -NFS4ERR_STALE_CLIENTID:
3504                 case -NFS4ERR_EXPIRED:
3505                         goto do_state_recovery;
3506 #if defined(CONFIG_NFS_V4_1)
3507                 case -NFS4ERR_BADSESSION:
3508                 case -NFS4ERR_BADSLOT:
3509                 case -NFS4ERR_BAD_HIGH_SLOT:
3510                 case -NFS4ERR_DEADSESSION:
3511                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3512                 case -NFS4ERR_SEQ_FALSE_RETRY:
3513                 case -NFS4ERR_SEQ_MISORDERED:
3514                         dprintk("%s ERROR %d, Reset session\n", __func__,
3515                                 task->tk_status);
3516                         nfs4_schedule_state_recovery(clp);
3517                         task->tk_status = 0;
3518                         return -EAGAIN;
3519 #endif /* CONFIG_NFS_V4_1 */
3520                 case -NFS4ERR_DELAY:
3521                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3522                 case -NFS4ERR_GRACE:
3523                 case -EKEYEXPIRED:
3524                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3525                         task->tk_status = 0;
3526                         return -EAGAIN;
3527                 case -NFS4ERR_OLD_STATEID:
3528                         task->tk_status = 0;
3529                         return -EAGAIN;
3530         }
3531         task->tk_status = nfs4_map_errors(task->tk_status);
3532         return 0;
3533 do_state_recovery:
3534         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3535         nfs4_schedule_state_recovery(clp);
3536         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3537                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3538         task->tk_status = 0;
3539         return -EAGAIN;
3540 }
3541
3542 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3543                 unsigned short port, struct rpc_cred *cred,
3544                 struct nfs4_setclientid_res *res)
3545 {
3546         nfs4_verifier sc_verifier;
3547         struct nfs4_setclientid setclientid = {
3548                 .sc_verifier = &sc_verifier,
3549                 .sc_prog = program,
3550         };
3551         struct rpc_message msg = {
3552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3553                 .rpc_argp = &setclientid,
3554                 .rpc_resp = res,
3555                 .rpc_cred = cred,
3556         };
3557         __be32 *p;
3558         int loop = 0;
3559         int status;
3560
3561         p = (__be32*)sc_verifier.data;
3562         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3563         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3564
3565         for(;;) {
3566                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3567                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3568                                 clp->cl_ipaddr,
3569                                 rpc_peeraddr2str(clp->cl_rpcclient,
3570                                                         RPC_DISPLAY_ADDR),
3571                                 rpc_peeraddr2str(clp->cl_rpcclient,
3572                                                         RPC_DISPLAY_PROTO),
3573                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3574                                 clp->cl_id_uniquifier);
3575                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3576                                 sizeof(setclientid.sc_netid),
3577                                 rpc_peeraddr2str(clp->cl_rpcclient,
3578                                                         RPC_DISPLAY_NETID));
3579                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3580                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3581                                 clp->cl_ipaddr, port >> 8, port & 255);
3582
3583                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3584                 if (status != -NFS4ERR_CLID_INUSE)
3585                         break;
3586                 if (signalled())
3587                         break;
3588                 if (loop++ & 1)
3589                         ssleep(clp->cl_lease_time + 1);
3590                 else
3591                         if (++clp->cl_id_uniquifier == 0)
3592                                 break;
3593         }
3594         return status;
3595 }
3596
3597 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3598                 struct nfs4_setclientid_res *arg,
3599                 struct rpc_cred *cred)
3600 {
3601         struct nfs_fsinfo fsinfo;
3602         struct rpc_message msg = {
3603                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3604                 .rpc_argp = arg,
3605                 .rpc_resp = &fsinfo,
3606                 .rpc_cred = cred,
3607         };
3608         unsigned long now;
3609         int status;
3610
3611         now = jiffies;
3612         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3613         if (status == 0) {
3614                 spin_lock(&clp->cl_lock);
3615                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3616                 clp->cl_last_renewal = now;
3617                 spin_unlock(&clp->cl_lock);
3618         }
3619         return status;
3620 }
3621
3622 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3623                 struct nfs4_setclientid_res *arg,
3624                 struct rpc_cred *cred)
3625 {
3626         long timeout = 0;
3627         int err;
3628         do {
3629                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3630                 switch (err) {
3631                         case 0:
3632                                 return err;
3633                         case -NFS4ERR_RESOURCE:
3634                                 /* The IBM lawyers misread another document! */
3635                         case -NFS4ERR_DELAY:
3636                         case -EKEYEXPIRED:
3637                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3638                 }
3639         } while (err == 0);
3640         return err;
3641 }
3642
3643 struct nfs4_delegreturndata {
3644         struct nfs4_delegreturnargs args;
3645         struct nfs4_delegreturnres res;
3646         struct nfs_fh fh;
3647         nfs4_stateid stateid;
3648         unsigned long timestamp;
3649         struct nfs_fattr fattr;
3650         int rpc_status;
3651 };
3652
3653 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3654 {
3655         struct nfs4_delegreturndata *data = calldata;
3656
3657         if (!nfs4_sequence_done(task, &data->res.seq_res))
3658                 return;
3659
3660         switch (task->tk_status) {
3661         case -NFS4ERR_STALE_STATEID:
3662         case -NFS4ERR_EXPIRED:
3663         case 0:
3664                 renew_lease(data->res.server, data->timestamp);
3665                 break;
3666         default:
3667                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3668                                 -EAGAIN) {
3669                         nfs_restart_rpc(task, data->res.server->nfs_client);
3670                         return;
3671                 }
3672         }
3673         data->rpc_status = task->tk_status;
3674 }
3675
3676 static void nfs4_delegreturn_release(void *calldata)
3677 {
3678         kfree(calldata);
3679 }
3680
3681 #if defined(CONFIG_NFS_V4_1)
3682 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3683 {
3684         struct nfs4_delegreturndata *d_data;
3685
3686         d_data = (struct nfs4_delegreturndata *)data;
3687
3688         if (nfs4_setup_sequence(d_data->res.server,
3689                                 &d_data->args.seq_args,
3690                                 &d_data->res.seq_res, 1, task))
3691                 return;
3692         rpc_call_start(task);
3693 }
3694 #endif /* CONFIG_NFS_V4_1 */
3695
3696 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3697 #if defined(CONFIG_NFS_V4_1)
3698         .rpc_call_prepare = nfs4_delegreturn_prepare,
3699 #endif /* CONFIG_NFS_V4_1 */
3700         .rpc_call_done = nfs4_delegreturn_done,
3701         .rpc_release = nfs4_delegreturn_release,
3702 };
3703
3704 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3705 {
3706         struct nfs4_delegreturndata *data;
3707         struct nfs_server *server = NFS_SERVER(inode);
3708         struct rpc_task *task;
3709         struct rpc_message msg = {
3710                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3711                 .rpc_cred = cred,
3712         };
3713         struct rpc_task_setup task_setup_data = {
3714                 .rpc_client = server->client,
3715                 .rpc_message = &msg,
3716                 .callback_ops = &nfs4_delegreturn_ops,
3717                 .flags = RPC_TASK_ASYNC,
3718         };
3719         int status = 0;
3720
3721         data = kzalloc(sizeof(*data), GFP_NOFS);
3722         if (data == NULL)
3723                 return -ENOMEM;
3724         data->args.fhandle = &data->fh;
3725         data->args.stateid = &data->stateid;
3726         data->args.bitmask = server->attr_bitmask;
3727         nfs_copy_fh(&data->fh, NFS_FH(inode));
3728         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3729         data->res.fattr = &data->fattr;
3730         data->res.server = server;
3731         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3732         nfs_fattr_init(data->res.fattr);
3733         data->timestamp = jiffies;
3734         data->rpc_status = 0;
3735
3736         task_setup_data.callback_data = data;
3737         msg.rpc_argp = &data->args,
3738         msg.rpc_resp = &data->res,
3739         task = rpc_run_task(&task_setup_data);
3740         if (IS_ERR(task))
3741                 return PTR_ERR(task);
3742         if (!issync)
3743                 goto out;
3744         status = nfs4_wait_for_completion_rpc_task(task);
3745         if (status != 0)
3746                 goto out;
3747         status = data->rpc_status;
3748         if (status != 0)
3749                 goto out;
3750         nfs_refresh_inode(inode, &data->fattr);
3751 out:
3752         rpc_put_task(task);
3753         return status;
3754 }
3755
3756 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3757 {
3758         struct nfs_server *server = NFS_SERVER(inode);
3759         struct nfs4_exception exception = { };
3760         int err;
3761         do {
3762                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3763                 switch (err) {
3764                         case -NFS4ERR_STALE_STATEID:
3765                         case -NFS4ERR_EXPIRED:
3766                         case 0:
3767                                 return 0;
3768                 }
3769                 err = nfs4_handle_exception(server, err, &exception);
3770         } while (exception.retry);
3771         return err;
3772 }
3773
3774 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3775 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3776
3777 /*
3778  * sleep, with exponential backoff, and retry the LOCK operation.
3779  */
3780 static unsigned long
3781 nfs4_set_lock_task_retry(unsigned long timeout)
3782 {
3783         schedule_timeout_killable(timeout);
3784         timeout <<= 1;
3785         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3786                 return NFS4_LOCK_MAXTIMEOUT;
3787         return timeout;
3788 }
3789
3790 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3791 {
3792         struct inode *inode = state->inode;
3793         struct nfs_server *server = NFS_SERVER(inode);
3794         struct nfs_client *clp = server->nfs_client;
3795         struct nfs_lockt_args arg = {
3796                 .fh = NFS_FH(inode),
3797                 .fl = request,
3798         };
3799         struct nfs_lockt_res res = {
3800                 .denied = request,
3801         };
3802         struct rpc_message msg = {
3803                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3804                 .rpc_argp       = &arg,
3805                 .rpc_resp       = &res,
3806                 .rpc_cred       = state->owner->so_cred,
3807         };
3808         struct nfs4_lock_state *lsp;
3809         int status;
3810
3811         arg.lock_owner.clientid = clp->cl_clientid;
3812         status = nfs4_set_lock_state(state, request);
3813         if (status != 0)
3814                 goto out;
3815         lsp = request->fl_u.nfs4_fl.owner;
3816         arg.lock_owner.id = lsp->ls_id.id;
3817         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3818         switch (status) {
3819                 case 0:
3820                         request->fl_type = F_UNLCK;
3821                         break;
3822                 case -NFS4ERR_DENIED:
3823                         status = 0;
3824         }
3825         request->fl_ops->fl_release_private(request);
3826 out:
3827         return status;
3828 }
3829
3830 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3831 {
3832         struct nfs4_exception exception = { };
3833         int err;
3834
3835         do {
3836                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3837                                 _nfs4_proc_getlk(state, cmd, request),
3838                                 &exception);
3839         } while (exception.retry);
3840         return err;
3841 }
3842
3843 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3844 {
3845         int res = 0;
3846         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3847                 case FL_POSIX:
3848                         res = posix_lock_file_wait(file, fl);
3849                         break;
3850                 case FL_FLOCK:
3851                         res = flock_lock_file_wait(file, fl);
3852                         break;
3853                 default:
3854                         BUG();
3855         }
3856         return res;
3857 }
3858
3859 struct nfs4_unlockdata {
3860         struct nfs_locku_args arg;
3861         struct nfs_locku_res res;
3862         struct nfs4_lock_state *lsp;
3863         struct nfs_open_context *ctx;
3864         struct file_lock fl;
3865         const struct nfs_server *server;
3866         unsigned long timestamp;
3867 };
3868
3869 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3870                 struct nfs_open_context *ctx,
3871                 struct nfs4_lock_state *lsp,
3872                 struct nfs_seqid *seqid)
3873 {
3874         struct nfs4_unlockdata *p;
3875         struct inode *inode = lsp->ls_state->inode;
3876
3877         p = kzalloc(sizeof(*p), GFP_NOFS);
3878         if (p == NULL)
3879                 return NULL;
3880         p->arg.fh = NFS_FH(inode);
3881         p->arg.fl = &p->fl;
3882         p->arg.seqid = seqid;
3883         p->res.seqid = seqid;
3884         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3885         p->arg.stateid = &lsp->ls_stateid;
3886         p->lsp = lsp;
3887         atomic_inc(&lsp->ls_count);
3888         /* Ensure we don't close file until we're done freeing locks! */
3889         p->ctx = get_nfs_open_context(ctx);
3890         memcpy(&p->fl, fl, sizeof(p->fl));
3891         p->server = NFS_SERVER(inode);
3892         return p;
3893 }
3894
3895 static void nfs4_locku_release_calldata(void *data)
3896 {
3897         struct nfs4_unlockdata *calldata = data;
3898         nfs_free_seqid(calldata->arg.seqid);
3899         nfs4_put_lock_state(calldata->lsp);
3900         put_nfs_open_context(calldata->ctx);
3901         kfree(calldata);
3902 }
3903
3904 static void nfs4_locku_done(struct rpc_task *task, void *data)
3905 {
3906         struct nfs4_unlockdata *calldata = data;
3907
3908         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3909                 return;
3910         if (RPC_ASSASSINATED(task))
3911                 return;
3912         switch (task->tk_status) {
3913                 case 0:
3914                         memcpy(calldata->lsp->ls_stateid.data,
3915                                         calldata->res.stateid.data,
3916                                         sizeof(calldata->lsp->ls_stateid.data));
3917                         renew_lease(calldata->server, calldata->timestamp);
3918                         break;
3919                 case -NFS4ERR_BAD_STATEID:
3920                 case -NFS4ERR_OLD_STATEID:
3921                 case -NFS4ERR_STALE_STATEID:
3922                 case -NFS4ERR_EXPIRED:
3923                         break;
3924                 default:
3925                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3926                                 nfs_restart_rpc(task,
3927                                                  calldata->server->nfs_client);
3928         }
3929 }
3930
3931 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3932 {
3933         struct nfs4_unlockdata *calldata = data;
3934
3935         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3936                 return;
3937         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3938                 /* Note: exit _without_ running nfs4_locku_done */
3939                 task->tk_action = NULL;
3940                 return;
3941         }
3942         calldata->timestamp = jiffies;
3943         if (nfs4_setup_sequence(calldata->server,
3944                                 &calldata->arg.seq_args,
3945                                 &calldata->res.seq_res, 1, task))
3946                 return;
3947         rpc_call_start(task);
3948 }
3949
3950 static const struct rpc_call_ops nfs4_locku_ops = {
3951         .rpc_call_prepare = nfs4_locku_prepare,
3952         .rpc_call_done = nfs4_locku_done,
3953         .rpc_release = nfs4_locku_release_calldata,
3954 };
3955
3956 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3957                 struct nfs_open_context *ctx,
3958                 struct nfs4_lock_state *lsp,
3959                 struct nfs_seqid *seqid)
3960 {
3961         struct nfs4_unlockdata *data;
3962         struct rpc_message msg = {
3963                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3964                 .rpc_cred = ctx->cred,
3965         };
3966         struct rpc_task_setup task_setup_data = {
3967                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3968                 .rpc_message = &msg,
3969                 .callback_ops = &nfs4_locku_ops,
3970                 .workqueue = nfsiod_workqueue,
3971                 .flags = RPC_TASK_ASYNC,
3972         };
3973
3974         /* Ensure this is an unlock - when canceling a lock, the
3975          * canceled lock is passed in, and it won't be an unlock.
3976          */
3977         fl->fl_type = F_UNLCK;
3978
3979         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3980         if (data == NULL) {
3981                 nfs_free_seqid(seqid);
3982                 return ERR_PTR(-ENOMEM);
3983         }
3984
3985         msg.rpc_argp = &data->arg,
3986         msg.rpc_resp = &data->res,
3987         task_setup_data.callback_data = data;
3988         return rpc_run_task(&task_setup_data);
3989 }
3990
3991 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3992 {
3993         struct nfs_inode *nfsi = NFS_I(state->inode);
3994         struct nfs_seqid *seqid;
3995         struct nfs4_lock_state *lsp;
3996         struct rpc_task *task;
3997         int status = 0;
3998         unsigned char fl_flags = request->fl_flags;
3999
4000         status = nfs4_set_lock_state(state, request);
4001         /* Unlock _before_ we do the RPC call */
4002         request->fl_flags |= FL_EXISTS;
4003         down_read(&nfsi->rwsem);
4004         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4005                 up_read(&nfsi->rwsem);
4006                 goto out;
4007         }
4008         up_read(&nfsi->rwsem);
4009         if (status != 0)
4010                 goto out;
4011         /* Is this a delegated lock? */
4012         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4013                 goto out;
4014         lsp = request->fl_u.nfs4_fl.owner;
4015         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4016         status = -ENOMEM;
4017         if (seqid == NULL)
4018                 goto out;
4019         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4020         status = PTR_ERR(task);
4021         if (IS_ERR(task))
4022                 goto out;
4023         status = nfs4_wait_for_completion_rpc_task(task);
4024         rpc_put_task(task);
4025 out:
4026         request->fl_flags = fl_flags;
4027         return status;
4028 }
4029
4030 struct nfs4_lockdata {
4031         struct nfs_lock_args arg;
4032         struct nfs_lock_res res;
4033         struct nfs4_lock_state *lsp;
4034         struct nfs_open_context *ctx;
4035         struct file_lock fl;
4036         unsigned long timestamp;
4037         int rpc_status;
4038         int cancelled;
4039         struct nfs_server *server;
4040 };
4041
4042 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4043                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4044                 gfp_t gfp_mask)
4045 {
4046         struct nfs4_lockdata *p;
4047         struct inode *inode = lsp->ls_state->inode;
4048         struct nfs_server *server = NFS_SERVER(inode);
4049
4050         p = kzalloc(sizeof(*p), gfp_mask);
4051         if (p == NULL)
4052                 return NULL;
4053
4054         p->arg.fh = NFS_FH(inode);
4055         p->arg.fl = &p->fl;
4056         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4057         if (p->arg.open_seqid == NULL)
4058                 goto out_free;
4059         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4060         if (p->arg.lock_seqid == NULL)
4061                 goto out_free_seqid;
4062         p->arg.lock_stateid = &lsp->ls_stateid;
4063         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4064         p->arg.lock_owner.id = lsp->ls_id.id;
4065         p->res.lock_seqid = p->arg.lock_seqid;
4066         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4067         p->lsp = lsp;
4068         p->server = server;
4069         atomic_inc(&lsp->ls_count);
4070         p->ctx = get_nfs_open_context(ctx);
4071         memcpy(&p->fl, fl, sizeof(p->fl));
4072         return p;
4073 out_free_seqid:
4074         nfs_free_seqid(p->arg.open_seqid);
4075 out_free:
4076         kfree(p);
4077         return NULL;
4078 }
4079
4080 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4081 {
4082         struct nfs4_lockdata *data = calldata;
4083         struct nfs4_state *state = data->lsp->ls_state;
4084
4085         dprintk("%s: begin!\n", __func__);
4086         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4087                 return;
4088         /* Do we need to do an open_to_lock_owner? */
4089         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4090                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4091                         return;
4092                 data->arg.open_stateid = &state->stateid;
4093                 data->arg.new_lock_owner = 1;
4094                 data->res.open_seqid = data->arg.open_seqid;
4095         } else
4096                 data->arg.new_lock_owner = 0;
4097         data->timestamp = jiffies;
4098         if (nfs4_setup_sequence(data->server,
4099                                 &data->arg.seq_args,
4100                                 &data->res.seq_res, 1, task))
4101                 return;
4102         rpc_call_start(task);
4103         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4104 }
4105
4106 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4107 {
4108         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4109         nfs4_lock_prepare(task, calldata);
4110 }
4111
4112 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4113 {
4114         struct nfs4_lockdata *data = calldata;
4115
4116         dprintk("%s: begin!\n", __func__);
4117
4118         if (!nfs4_sequence_done(task, &data->res.seq_res))
4119                 return;
4120
4121         data->rpc_status = task->tk_status;
4122         if (RPC_ASSASSINATED(task))
4123                 goto out;
4124         if (data->arg.new_lock_owner != 0) {
4125                 if (data->rpc_status == 0)
4126                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4127                 else
4128                         goto out;
4129         }
4130         if (data->rpc_status == 0) {
4131                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4132                                         sizeof(data->lsp->ls_stateid.data));
4133                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4134                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4135         }
4136 out:
4137         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4138 }
4139
4140 static void nfs4_lock_release(void *calldata)
4141 {
4142         struct nfs4_lockdata *data = calldata;
4143
4144         dprintk("%s: begin!\n", __func__);
4145         nfs_free_seqid(data->arg.open_seqid);
4146         if (data->cancelled != 0) {
4147                 struct rpc_task *task;
4148                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4149                                 data->arg.lock_seqid);
4150                 if (!IS_ERR(task))
4151                         rpc_put_task(task);
4152                 dprintk("%s: cancelling lock!\n", __func__);
4153         } else
4154                 nfs_free_seqid(data->arg.lock_seqid);
4155         nfs4_put_lock_state(data->lsp);
4156         put_nfs_open_context(data->ctx);
4157         kfree(data);
4158         dprintk("%s: done!\n", __func__);
4159 }
4160
4161 static const struct rpc_call_ops nfs4_lock_ops = {
4162         .rpc_call_prepare = nfs4_lock_prepare,
4163         .rpc_call_done = nfs4_lock_done,
4164         .rpc_release = nfs4_lock_release,
4165 };
4166
4167 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4168         .rpc_call_prepare = nfs4_recover_lock_prepare,
4169         .rpc_call_done = nfs4_lock_done,
4170         .rpc_release = nfs4_lock_release,
4171 };
4172
4173 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4174 {
4175         struct nfs_client *clp = server->nfs_client;
4176         struct nfs4_state *state = lsp->ls_state;
4177
4178         switch (error) {
4179         case -NFS4ERR_ADMIN_REVOKED:
4180         case -NFS4ERR_BAD_STATEID:
4181         case -NFS4ERR_EXPIRED:
4182                 if (new_lock_owner != 0 ||
4183                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4184                         nfs4_state_mark_reclaim_nograce(clp, state);
4185                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4186                 break;
4187         case -NFS4ERR_STALE_STATEID:
4188                 if (new_lock_owner != 0 ||
4189                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4190                         nfs4_state_mark_reclaim_reboot(clp, state);
4191                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4192         };
4193 }
4194
4195 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4196 {
4197         struct nfs4_lockdata *data;
4198         struct rpc_task *task;
4199         struct rpc_message msg = {
4200                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4201                 .rpc_cred = state->owner->so_cred,
4202         };
4203         struct rpc_task_setup task_setup_data = {
4204                 .rpc_client = NFS_CLIENT(state->inode),
4205                 .rpc_message = &msg,
4206                 .callback_ops = &nfs4_lock_ops,
4207                 .workqueue = nfsiod_workqueue,
4208                 .flags = RPC_TASK_ASYNC,
4209         };
4210         int ret;
4211
4212         dprintk("%s: begin!\n", __func__);
4213         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4214                         fl->fl_u.nfs4_fl.owner,
4215                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4216         if (data == NULL)
4217                 return -ENOMEM;
4218         if (IS_SETLKW(cmd))
4219                 data->arg.block = 1;
4220         if (recovery_type > NFS_LOCK_NEW) {
4221                 if (recovery_type == NFS_LOCK_RECLAIM)
4222                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4223                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4224         }
4225         msg.rpc_argp = &data->arg,
4226         msg.rpc_resp = &data->res,
4227         task_setup_data.callback_data = data;
4228         task = rpc_run_task(&task_setup_data);
4229         if (IS_ERR(task))
4230                 return PTR_ERR(task);
4231         ret = nfs4_wait_for_completion_rpc_task(task);
4232         if (ret == 0) {
4233                 ret = data->rpc_status;
4234                 if (ret)
4235                         nfs4_handle_setlk_error(data->server, data->lsp,
4236                                         data->arg.new_lock_owner, ret);
4237         } else
4238                 data->cancelled = 1;
4239         rpc_put_task(task);
4240         dprintk("%s: done, ret = %d!\n", __func__, ret);
4241         return ret;
4242 }
4243
4244 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4245 {
4246         struct nfs_server *server = NFS_SERVER(state->inode);
4247         struct nfs4_exception exception = { };
4248         int err;
4249
4250         do {
4251                 /* Cache the lock if possible... */
4252                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4253                         return 0;
4254                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4255                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4256                         break;
4257                 nfs4_handle_exception(server, err, &exception);
4258         } while (exception.retry);
4259         return err;
4260 }
4261
4262 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4263 {
4264         struct nfs_server *server = NFS_SERVER(state->inode);
4265         struct nfs4_exception exception = { };
4266         int err;
4267
4268         err = nfs4_set_lock_state(state, request);
4269         if (err != 0)
4270                 return err;
4271         do {
4272                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4273                         return 0;
4274                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4275                 switch (err) {
4276                 default:
4277                         goto out;
4278                 case -NFS4ERR_GRACE:
4279                 case -NFS4ERR_DELAY:
4280                 case -EKEYEXPIRED:
4281                         nfs4_handle_exception(server, err, &exception);
4282                         err = 0;
4283                 }
4284         } while (exception.retry);
4285 out:
4286         return err;
4287 }
4288
4289 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4290 {
4291         struct nfs_inode *nfsi = NFS_I(state->inode);
4292         unsigned char fl_flags = request->fl_flags;
4293         int status = -ENOLCK;
4294
4295         if ((fl_flags & FL_POSIX) &&
4296                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4297                 goto out;
4298         /* Is this a delegated open? */
4299         status = nfs4_set_lock_state(state, request);
4300         if (status != 0)
4301                 goto out;
4302         request->fl_flags |= FL_ACCESS;
4303         status = do_vfs_lock(request->fl_file, request);
4304         if (status < 0)
4305                 goto out;
4306         down_read(&nfsi->rwsem);
4307         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4308                 /* Yes: cache locks! */
4309                 /* ...but avoid races with delegation recall... */
4310                 request->fl_flags = fl_flags & ~FL_SLEEP;
4311                 status = do_vfs_lock(request->fl_file, request);
4312                 goto out_unlock;
4313         }
4314         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4315         if (status != 0)
4316                 goto out_unlock;
4317         /* Note: we always want to sleep here! */
4318         request->fl_flags = fl_flags | FL_SLEEP;
4319         if (do_vfs_lock(request->fl_file, request) < 0)
4320                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4321 out_unlock:
4322         up_read(&nfsi->rwsem);
4323 out:
4324         request->fl_flags = fl_flags;
4325         return status;
4326 }
4327
4328 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4329 {
4330         struct nfs4_exception exception = { };
4331         int err;
4332
4333         do {
4334                 err = _nfs4_proc_setlk(state, cmd, request);
4335                 if (err == -NFS4ERR_DENIED)
4336                         err = -EAGAIN;
4337                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4338                                 err, &exception);
4339         } while (exception.retry);
4340         return err;
4341 }
4342
4343 static int
4344 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4345 {
4346         struct nfs_open_context *ctx;
4347         struct nfs4_state *state;
4348         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4349         int status;
4350
4351         /* verify open state */
4352         ctx = nfs_file_open_context(filp);
4353         state = ctx->state;
4354
4355         if (request->fl_start < 0 || request->fl_end < 0)
4356                 return -EINVAL;
4357
4358         if (IS_GETLK(cmd)) {
4359                 if (state != NULL)
4360                         return nfs4_proc_getlk(state, F_GETLK, request);
4361                 return 0;
4362         }
4363
4364         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4365                 return -EINVAL;
4366
4367         if (request->fl_type == F_UNLCK) {
4368                 if (state != NULL)
4369                         return nfs4_proc_unlck(state, cmd, request);
4370                 return 0;
4371         }
4372
4373         if (state == NULL)
4374                 return -ENOLCK;
4375         do {
4376                 status = nfs4_proc_setlk(state, cmd, request);
4377                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4378                         break;
4379                 timeout = nfs4_set_lock_task_retry(timeout);
4380                 status = -ERESTARTSYS;
4381                 if (signalled())
4382                         break;
4383         } while(status < 0);
4384         return status;
4385 }
4386
4387 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4388 {
4389         struct nfs_server *server = NFS_SERVER(state->inode);
4390         struct nfs4_exception exception = { };
4391         int err;
4392
4393         err = nfs4_set_lock_state(state, fl);
4394         if (err != 0)
4395                 goto out;
4396         do {
4397                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4398                 switch (err) {
4399                         default:
4400                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4401                                                 __func__, err);
4402                         case 0:
4403                         case -ESTALE:
4404                                 goto out;
4405                         case -NFS4ERR_EXPIRED:
4406                         case -NFS4ERR_STALE_CLIENTID:
4407                         case -NFS4ERR_STALE_STATEID:
4408                         case -NFS4ERR_BADSESSION:
4409                         case -NFS4ERR_BADSLOT:
4410                         case -NFS4ERR_BAD_HIGH_SLOT:
4411                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4412                         case -NFS4ERR_DEADSESSION:
4413                                 nfs4_schedule_state_recovery(server->nfs_client);
4414                                 goto out;
4415                         case -ERESTARTSYS:
4416                                 /*
4417                                  * The show must go on: exit, but mark the
4418                                  * stateid as needing recovery.
4419                                  */
4420                         case -NFS4ERR_ADMIN_REVOKED:
4421                         case -NFS4ERR_BAD_STATEID:
4422                         case -NFS4ERR_OPENMODE:
4423                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4424                                 err = 0;
4425                                 goto out;
4426                         case -ENOMEM:
4427                         case -NFS4ERR_DENIED:
4428                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4429                                 err = 0;
4430                                 goto out;
4431                         case -NFS4ERR_DELAY:
4432                         case -EKEYEXPIRED:
4433                                 break;
4434                 }
4435                 err = nfs4_handle_exception(server, err, &exception);
4436         } while (exception.retry);
4437 out:
4438         return err;
4439 }
4440
4441 static void nfs4_release_lockowner_release(void *calldata)
4442 {
4443         kfree(calldata);
4444 }
4445
4446 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4447         .rpc_release = nfs4_release_lockowner_release,
4448 };
4449
4450 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4451 {
4452         struct nfs_server *server = lsp->ls_state->owner->so_server;
4453         struct nfs_release_lockowner_args *args;
4454         struct rpc_message msg = {
4455                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4456         };
4457
4458         if (server->nfs_client->cl_mvops->minor_version != 0)
4459                 return;
4460         args = kmalloc(sizeof(*args), GFP_NOFS);
4461         if (!args)
4462                 return;
4463         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4464         args->lock_owner.id = lsp->ls_id.id;
4465         msg.rpc_argp = args;
4466         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4467 }
4468
4469 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4470
4471 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4472                 size_t buflen, int flags)
4473 {
4474         struct inode *inode = dentry->d_inode;
4475
4476         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4477                 return -EOPNOTSUPP;
4478
4479         return nfs4_proc_set_acl(inode, buf, buflen);
4480 }
4481
4482 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4483  * and that's what we'll do for e.g. user attributes that haven't been set.
4484  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4485  * attributes in kernel-managed attribute namespaces. */
4486 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4487                 size_t buflen)
4488 {
4489         struct inode *inode = dentry->d_inode;
4490
4491         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4492                 return -EOPNOTSUPP;
4493
4494         return nfs4_proc_get_acl(inode, buf, buflen);
4495 }
4496
4497 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4498 {
4499         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4500
4501         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4502                 return 0;
4503         if (buf && buflen < len)
4504                 return -ERANGE;
4505         if (buf)
4506                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4507         return len;
4508 }
4509
4510 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4511 {
4512         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4513                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4514                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4515                 return;
4516
4517         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4518                 NFS_ATTR_FATTR_NLINK;
4519         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4520         fattr->nlink = 2;
4521 }
4522
4523 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4524                 struct nfs4_fs_locations *fs_locations, struct page *page)
4525 {
4526         struct nfs_server *server = NFS_SERVER(dir);
4527         u32 bitmask[2] = {
4528                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4529                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4530         };
4531         struct nfs4_fs_locations_arg args = {
4532                 .dir_fh = NFS_FH(dir),
4533                 .name = name,
4534                 .page = page,
4535                 .bitmask = bitmask,
4536         };
4537         struct nfs4_fs_locations_res res = {
4538                 .fs_locations = fs_locations,
4539         };
4540         struct rpc_message msg = {
4541                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4542                 .rpc_argp = &args,
4543                 .rpc_resp = &res,
4544         };
4545         int status;
4546
4547         dprintk("%s: start\n", __func__);
4548         nfs_fattr_init(&fs_locations->fattr);
4549         fs_locations->server = server;
4550         fs_locations->nlocations = 0;
4551         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4552         nfs_fixup_referral_attributes(&fs_locations->fattr);
4553         dprintk("%s: returned status = %d\n", __func__, status);
4554         return status;
4555 }
4556
4557 #ifdef CONFIG_NFS_V4_1
4558 /*
4559  * nfs4_proc_exchange_id()
4560  *
4561  * Since the clientid has expired, all compounds using sessions
4562  * associated with the stale clientid will be returning
4563  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4564  * be in some phase of session reset.
4565  */
4566 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4567 {
4568         nfs4_verifier verifier;
4569         struct nfs41_exchange_id_args args = {
4570                 .client = clp,
4571                 .flags = clp->cl_exchange_flags,
4572         };
4573         struct nfs41_exchange_id_res res = {
4574                 .client = clp,
4575         };
4576         int status;
4577         struct rpc_message msg = {
4578                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4579                 .rpc_argp = &args,
4580                 .rpc_resp = &res,
4581                 .rpc_cred = cred,
4582         };
4583         __be32 *p;
4584
4585         dprintk("--> %s\n", __func__);
4586         BUG_ON(clp == NULL);
4587
4588         /* Remove server-only flags */
4589         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4590
4591         p = (u32 *)verifier.data;
4592         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4593         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4594         args.verifier = &verifier;
4595
4596         while (1) {
4597                 args.id_len = scnprintf(args.id, sizeof(args.id),
4598                                         "%s/%s %u",
4599                                         clp->cl_ipaddr,
4600                                         rpc_peeraddr2str(clp->cl_rpcclient,
4601                                                          RPC_DISPLAY_ADDR),
4602                                         clp->cl_id_uniquifier);
4603
4604                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4605
4606                 if (status != -NFS4ERR_CLID_INUSE)
4607                         break;
4608
4609                 if (signalled())
4610                         break;
4611
4612                 if (++clp->cl_id_uniquifier == 0)
4613                         break;
4614         }
4615
4616         dprintk("<-- %s status= %d\n", __func__, status);
4617         return status;
4618 }
4619
4620 struct nfs4_get_lease_time_data {
4621         struct nfs4_get_lease_time_args *args;
4622         struct nfs4_get_lease_time_res *res;
4623         struct nfs_client *clp;
4624 };
4625
4626 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4627                                         void *calldata)
4628 {
4629         int ret;
4630         struct nfs4_get_lease_time_data *data =
4631                         (struct nfs4_get_lease_time_data *)calldata;
4632
4633         dprintk("--> %s\n", __func__);
4634         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4635         /* just setup sequence, do not trigger session recovery
4636            since we're invoked within one */
4637         ret = nfs41_setup_sequence(data->clp->cl_session,
4638                                    &data->args->la_seq_args,
4639                                    &data->res->lr_seq_res, 0, task);
4640
4641         BUG_ON(ret == -EAGAIN);
4642         rpc_call_start(task);
4643         dprintk("<-- %s\n", __func__);
4644 }
4645
4646 /*
4647  * Called from nfs4_state_manager thread for session setup, so don't recover
4648  * from sequence operation or clientid errors.
4649  */
4650 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4651 {
4652         struct nfs4_get_lease_time_data *data =
4653                         (struct nfs4_get_lease_time_data *)calldata;
4654
4655         dprintk("--> %s\n", __func__);
4656         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4657                 return;
4658         switch (task->tk_status) {
4659         case -NFS4ERR_DELAY:
4660         case -NFS4ERR_GRACE:
4661         case -EKEYEXPIRED:
4662                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4663                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4664                 task->tk_status = 0;
4665                 nfs_restart_rpc(task, data->clp);
4666                 return;
4667         }
4668         dprintk("<-- %s\n", __func__);
4669 }
4670
4671 struct rpc_call_ops nfs4_get_lease_time_ops = {
4672         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4673         .rpc_call_done = nfs4_get_lease_time_done,
4674 };
4675
4676 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4677 {
4678         struct rpc_task *task;
4679         struct nfs4_get_lease_time_args args;
4680         struct nfs4_get_lease_time_res res = {
4681                 .lr_fsinfo = fsinfo,
4682         };
4683         struct nfs4_get_lease_time_data data = {
4684                 .args = &args,
4685                 .res = &res,
4686                 .clp = clp,
4687         };
4688         struct rpc_message msg = {
4689                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4690                 .rpc_argp = &args,
4691                 .rpc_resp = &res,
4692         };
4693         struct rpc_task_setup task_setup = {
4694                 .rpc_client = clp->cl_rpcclient,
4695                 .rpc_message = &msg,
4696                 .callback_ops = &nfs4_get_lease_time_ops,
4697                 .callback_data = &data
4698         };
4699         int status;
4700
4701         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4702         dprintk("--> %s\n", __func__);
4703         task = rpc_run_task(&task_setup);
4704
4705         if (IS_ERR(task))
4706                 status = PTR_ERR(task);
4707         else {
4708                 status = task->tk_status;
4709                 rpc_put_task(task);
4710         }
4711         dprintk("<-- %s return %d\n", __func__, status);
4712
4713         return status;
4714 }
4715
4716 /*
4717  * Reset a slot table
4718  */
4719 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4720                                  int ivalue)
4721 {
4722         struct nfs4_slot *new = NULL;
4723         int i;
4724         int ret = 0;
4725
4726         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4727                 max_reqs, tbl->max_slots);
4728
4729         /* Does the newly negotiated max_reqs match the existing slot table? */
4730         if (max_reqs != tbl->max_slots) {
4731                 ret = -ENOMEM;
4732                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4733                               GFP_NOFS);
4734                 if (!new)
4735                         goto out;
4736                 ret = 0;
4737                 kfree(tbl->slots);
4738         }
4739         spin_lock(&tbl->slot_tbl_lock);
4740         if (new) {
4741                 tbl->slots = new;
4742                 tbl->max_slots = max_reqs;
4743         }
4744         for (i = 0; i < tbl->max_slots; ++i)
4745                 tbl->slots[i].seq_nr = ivalue;
4746         spin_unlock(&tbl->slot_tbl_lock);
4747         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4748                 tbl, tbl->slots, tbl->max_slots);
4749 out:
4750         dprintk("<-- %s: return %d\n", __func__, ret);
4751         return ret;
4752 }
4753
4754 /*
4755  * Reset the forechannel and backchannel slot tables
4756  */
4757 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4758 {
4759         int status;
4760
4761         status = nfs4_reset_slot_table(&session->fc_slot_table,
4762                         session->fc_attrs.max_reqs, 1);
4763         if (status)
4764                 return status;
4765
4766         status = nfs4_reset_slot_table(&session->bc_slot_table,
4767                         session->bc_attrs.max_reqs, 0);
4768         return status;
4769 }
4770
4771 /* Destroy the slot table */
4772 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4773 {
4774         if (session->fc_slot_table.slots != NULL) {
4775                 kfree(session->fc_slot_table.slots);
4776                 session->fc_slot_table.slots = NULL;
4777         }
4778         if (session->bc_slot_table.slots != NULL) {
4779                 kfree(session->bc_slot_table.slots);
4780                 session->bc_slot_table.slots = NULL;
4781         }
4782         return;
4783 }
4784
4785 /*
4786  * Initialize slot table
4787  */
4788 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4789                 int max_slots, int ivalue)
4790 {
4791         struct nfs4_slot *slot;
4792         int ret = -ENOMEM;
4793
4794         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4795
4796         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4797
4798         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4799         if (!slot)
4800                 goto out;
4801         ret = 0;
4802
4803         spin_lock(&tbl->slot_tbl_lock);
4804         tbl->max_slots = max_slots;
4805         tbl->slots = slot;
4806         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4807         spin_unlock(&tbl->slot_tbl_lock);
4808         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4809                 tbl, tbl->slots, tbl->max_slots);
4810 out:
4811         dprintk("<-- %s: return %d\n", __func__, ret);
4812         return ret;
4813 }
4814
4815 /*
4816  * Initialize the forechannel and backchannel tables
4817  */
4818 static int nfs4_init_slot_tables(struct nfs4_session *session)
4819 {
4820         struct nfs4_slot_table *tbl;
4821         int status = 0;
4822
4823         tbl = &session->fc_slot_table;
4824         if (tbl->slots == NULL) {
4825                 status = nfs4_init_slot_table(tbl,
4826                                 session->fc_attrs.max_reqs, 1);
4827                 if (status)
4828                         return status;
4829         }
4830
4831         tbl = &session->bc_slot_table;
4832         if (tbl->slots == NULL) {
4833                 status = nfs4_init_slot_table(tbl,
4834                                 session->bc_attrs.max_reqs, 0);
4835                 if (status)
4836                         nfs4_destroy_slot_tables(session);
4837         }
4838
4839         return status;
4840 }
4841
4842 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4843 {
4844         struct nfs4_session *session;
4845         struct nfs4_slot_table *tbl;
4846
4847         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4848         if (!session)
4849                 return NULL;
4850
4851         init_completion(&session->complete);
4852
4853         tbl = &session->fc_slot_table;
4854         tbl->highest_used_slotid = -1;
4855         spin_lock_init(&tbl->slot_tbl_lock);
4856         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4857
4858         tbl = &session->bc_slot_table;
4859         tbl->highest_used_slotid = -1;
4860         spin_lock_init(&tbl->slot_tbl_lock);
4861         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4862
4863         session->session_state = 1<<NFS4_SESSION_INITING;
4864
4865         session->clp = clp;
4866         return session;
4867 }
4868
4869 void nfs4_destroy_session(struct nfs4_session *session)
4870 {
4871         nfs4_proc_destroy_session(session);
4872         dprintk("%s Destroy backchannel for xprt %p\n",
4873                 __func__, session->clp->cl_rpcclient->cl_xprt);
4874         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4875                                 NFS41_BC_MIN_CALLBACKS);
4876         nfs4_destroy_slot_tables(session);
4877         kfree(session);
4878 }
4879
4880 /*
4881  * Initialize the values to be used by the client in CREATE_SESSION
4882  * If nfs4_init_session set the fore channel request and response sizes,
4883  * use them.
4884  *
4885  * Set the back channel max_resp_sz_cached to zero to force the client to
4886  * always set csa_cachethis to FALSE because the current implementation
4887  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4888  */
4889 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4890 {
4891         struct nfs4_session *session = args->client->cl_session;
4892         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4893                      mxresp_sz = session->fc_attrs.max_resp_sz;
4894
4895         if (mxrqst_sz == 0)
4896                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4897         if (mxresp_sz == 0)
4898                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4899         /* Fore channel attributes */
4900         args->fc_attrs.headerpadsz = 0;
4901         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4902         args->fc_attrs.max_resp_sz = mxresp_sz;
4903         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4904         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4905
4906         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4907                 "max_ops=%u max_reqs=%u\n",
4908                 __func__,
4909                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4910                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4911
4912         /* Back channel attributes */
4913         args->bc_attrs.headerpadsz = 0;
4914         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4915         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4916         args->bc_attrs.max_resp_sz_cached = 0;
4917         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4918         args->bc_attrs.max_reqs = 1;
4919
4920         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4921                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4922                 __func__,
4923                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4924                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4925                 args->bc_attrs.max_reqs);
4926 }
4927
4928 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4929 {
4930         if (rcvd <= sent)
4931                 return 0;
4932         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4933                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4934         return -EINVAL;
4935 }
4936
4937 #define _verify_fore_channel_attr(_name_) \
4938         _verify_channel_attr("fore", #_name_, \
4939                              args->fc_attrs._name_, \
4940                              session->fc_attrs._name_)
4941
4942 #define _verify_back_channel_attr(_name_) \
4943         _verify_channel_attr("back", #_name_, \
4944                              args->bc_attrs._name_, \
4945                              session->bc_attrs._name_)
4946
4947 /*
4948  * The server is not allowed to increase the fore channel header pad size,
4949  * maximum response size, or maximum number of operations.
4950  *
4951  * The back channel attributes are only negotiatied down: We send what the
4952  * (back channel) server insists upon.
4953  */
4954 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4955                                      struct nfs4_session *session)
4956 {
4957         int ret = 0;
4958
4959         ret |= _verify_fore_channel_attr(headerpadsz);
4960         ret |= _verify_fore_channel_attr(max_resp_sz);
4961         ret |= _verify_fore_channel_attr(max_ops);
4962
4963         ret |= _verify_back_channel_attr(headerpadsz);
4964         ret |= _verify_back_channel_attr(max_rqst_sz);
4965         ret |= _verify_back_channel_attr(max_resp_sz);
4966         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4967         ret |= _verify_back_channel_attr(max_ops);
4968         ret |= _verify_back_channel_attr(max_reqs);
4969
4970         return ret;
4971 }
4972
4973 static int _nfs4_proc_create_session(struct nfs_client *clp)
4974 {
4975         struct nfs4_session *session = clp->cl_session;
4976         struct nfs41_create_session_args args = {
4977                 .client = clp,
4978                 .cb_program = NFS4_CALLBACK,
4979         };
4980         struct nfs41_create_session_res res = {
4981                 .client = clp,
4982         };
4983         struct rpc_message msg = {
4984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4985                 .rpc_argp = &args,
4986                 .rpc_resp = &res,
4987         };
4988         int status;
4989
4990         nfs4_init_channel_attrs(&args);
4991         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4992
4993         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4994
4995         if (!status)
4996                 /* Verify the session's negotiated channel_attrs values */
4997                 status = nfs4_verify_channel_attrs(&args, session);
4998         if (!status) {
4999                 /* Increment the clientid slot sequence id */
5000                 clp->cl_seqid++;
5001         }
5002
5003         return status;
5004 }
5005
5006 /*
5007  * Issues a CREATE_SESSION operation to the server.
5008  * It is the responsibility of the caller to verify the session is
5009  * expired before calling this routine.
5010  */
5011 int nfs4_proc_create_session(struct nfs_client *clp)
5012 {
5013         int status;
5014         unsigned *ptr;
5015         struct nfs4_session *session = clp->cl_session;
5016
5017         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5018
5019         status = _nfs4_proc_create_session(clp);
5020         if (status)
5021                 goto out;
5022
5023         /* Init and reset the fore channel */
5024         status = nfs4_init_slot_tables(session);
5025         dprintk("slot table initialization returned %d\n", status);
5026         if (status)
5027                 goto out;
5028         status = nfs4_reset_slot_tables(session);
5029         dprintk("slot table reset returned %d\n", status);
5030         if (status)
5031                 goto out;
5032
5033         ptr = (unsigned *)&session->sess_id.data[0];
5034         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5035                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5036 out:
5037         dprintk("<-- %s\n", __func__);
5038         return status;
5039 }
5040
5041 /*
5042  * Issue the over-the-wire RPC DESTROY_SESSION.
5043  * The caller must serialize access to this routine.
5044  */
5045 int nfs4_proc_destroy_session(struct nfs4_session *session)
5046 {
5047         int status = 0;
5048         struct rpc_message msg;
5049
5050         dprintk("--> nfs4_proc_destroy_session\n");
5051
5052         /* session is still being setup */
5053         if (session->clp->cl_cons_state != NFS_CS_READY)
5054                 return status;
5055
5056         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5057         msg.rpc_argp = session;
5058         msg.rpc_resp = NULL;
5059         msg.rpc_cred = NULL;
5060         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5061
5062         if (status)
5063                 printk(KERN_WARNING
5064                         "Got error %d from the server on DESTROY_SESSION. "
5065                         "Session has been destroyed regardless...\n", status);
5066
5067         dprintk("<-- nfs4_proc_destroy_session\n");
5068         return status;
5069 }
5070
5071 int nfs4_init_session(struct nfs_server *server)
5072 {
5073         struct nfs_client *clp = server->nfs_client;
5074         struct nfs4_session *session;
5075         unsigned int rsize, wsize;
5076         int ret;
5077
5078         if (!nfs4_has_session(clp))
5079                 return 0;
5080
5081         session = clp->cl_session;
5082         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5083                 return 0;
5084
5085         rsize = server->rsize;
5086         if (rsize == 0)
5087                 rsize = NFS_MAX_FILE_IO_SIZE;
5088         wsize = server->wsize;
5089         if (wsize == 0)
5090                 wsize = NFS_MAX_FILE_IO_SIZE;
5091
5092         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5093         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5094
5095         ret = nfs4_recover_expired_lease(server);
5096         if (!ret)
5097                 ret = nfs4_check_client_ready(clp);
5098         return ret;
5099 }
5100
5101 /*
5102  * Renew the cl_session lease.
5103  */
5104 struct nfs4_sequence_data {
5105         struct nfs_client *clp;
5106         struct nfs4_sequence_args args;
5107         struct nfs4_sequence_res res;
5108 };
5109
5110 static void nfs41_sequence_release(void *data)
5111 {
5112         struct nfs4_sequence_data *calldata = data;
5113         struct nfs_client *clp = calldata->clp;
5114
5115         if (atomic_read(&clp->cl_count) > 1)
5116                 nfs4_schedule_state_renewal(clp);
5117         nfs_put_client(clp);
5118         kfree(calldata);
5119 }
5120
5121 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5122 {
5123         switch(task->tk_status) {
5124         case -NFS4ERR_DELAY:
5125         case -EKEYEXPIRED:
5126                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5127                 return -EAGAIN;
5128         default:
5129                 nfs4_schedule_state_recovery(clp);
5130         }
5131         return 0;
5132 }
5133
5134 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5135 {
5136         struct nfs4_sequence_data *calldata = data;
5137         struct nfs_client *clp = calldata->clp;
5138
5139         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5140                 return;
5141
5142         if (task->tk_status < 0) {
5143                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5144                 if (atomic_read(&clp->cl_count) == 1)
5145                         goto out;
5146
5147                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5148                         rpc_restart_call_prepare(task);
5149                         return;
5150                 }
5151         }
5152         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5153 out:
5154         dprintk("<-- %s\n", __func__);
5155 }
5156
5157 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5158 {
5159         struct nfs4_sequence_data *calldata = data;
5160         struct nfs_client *clp = calldata->clp;
5161         struct nfs4_sequence_args *args;
5162         struct nfs4_sequence_res *res;
5163
5164         args = task->tk_msg.rpc_argp;
5165         res = task->tk_msg.rpc_resp;
5166
5167         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5168                 return;
5169         rpc_call_start(task);
5170 }
5171
5172 static const struct rpc_call_ops nfs41_sequence_ops = {
5173         .rpc_call_done = nfs41_sequence_call_done,
5174         .rpc_call_prepare = nfs41_sequence_prepare,
5175         .rpc_release = nfs41_sequence_release,
5176 };
5177
5178 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5179 {
5180         struct nfs4_sequence_data *calldata;
5181         struct rpc_message msg = {
5182                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5183                 .rpc_cred = cred,
5184         };
5185         struct rpc_task_setup task_setup_data = {
5186                 .rpc_client = clp->cl_rpcclient,
5187                 .rpc_message = &msg,
5188                 .callback_ops = &nfs41_sequence_ops,
5189                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5190         };
5191
5192         if (!atomic_inc_not_zero(&clp->cl_count))
5193                 return ERR_PTR(-EIO);
5194         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5195         if (calldata == NULL) {
5196                 nfs_put_client(clp);
5197                 return ERR_PTR(-ENOMEM);
5198         }
5199         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5200         msg.rpc_argp = &calldata->args;
5201         msg.rpc_resp = &calldata->res;
5202         calldata->clp = clp;
5203         task_setup_data.callback_data = calldata;
5204
5205         return rpc_run_task(&task_setup_data);
5206 }
5207
5208 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5209 {
5210         struct rpc_task *task;
5211         int ret = 0;
5212
5213         task = _nfs41_proc_sequence(clp, cred);
5214         if (IS_ERR(task))
5215                 ret = PTR_ERR(task);
5216         else
5217                 rpc_put_task(task);
5218         dprintk("<-- %s status=%d\n", __func__, ret);
5219         return ret;
5220 }
5221
5222 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5223 {
5224         struct rpc_task *task;
5225         int ret;
5226
5227         task = _nfs41_proc_sequence(clp, cred);
5228         if (IS_ERR(task)) {
5229                 ret = PTR_ERR(task);
5230                 goto out;
5231         }
5232         ret = rpc_wait_for_completion_task(task);
5233         if (!ret)
5234                 ret = task->tk_status;
5235         rpc_put_task(task);
5236 out:
5237         dprintk("<-- %s status=%d\n", __func__, ret);
5238         return ret;
5239 }
5240
5241 struct nfs4_reclaim_complete_data {
5242         struct nfs_client *clp;
5243         struct nfs41_reclaim_complete_args arg;
5244         struct nfs41_reclaim_complete_res res;
5245 };
5246
5247 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5248 {
5249         struct nfs4_reclaim_complete_data *calldata = data;
5250
5251         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5252         if (nfs41_setup_sequence(calldata->clp->cl_session,
5253                                 &calldata->arg.seq_args,
5254                                 &calldata->res.seq_res, 0, task))
5255                 return;
5256
5257         rpc_call_start(task);
5258 }
5259
5260 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5261 {
5262         switch(task->tk_status) {
5263         case 0:
5264         case -NFS4ERR_COMPLETE_ALREADY:
5265         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5266                 break;
5267         case -NFS4ERR_DELAY:
5268         case -EKEYEXPIRED:
5269                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5270                 return -EAGAIN;
5271         default:
5272                 nfs4_schedule_state_recovery(clp);
5273         }
5274         return 0;
5275 }
5276
5277 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5278 {
5279         struct nfs4_reclaim_complete_data *calldata = data;
5280         struct nfs_client *clp = calldata->clp;
5281         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5282
5283         dprintk("--> %s\n", __func__);
5284         if (!nfs41_sequence_done(task, res))
5285                 return;
5286
5287         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5288                 rpc_restart_call_prepare(task);
5289                 return;
5290         }
5291         dprintk("<-- %s\n", __func__);
5292 }
5293
5294 static void nfs4_free_reclaim_complete_data(void *data)
5295 {
5296         struct nfs4_reclaim_complete_data *calldata = data;
5297
5298         kfree(calldata);
5299 }
5300
5301 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5302         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5303         .rpc_call_done = nfs4_reclaim_complete_done,
5304         .rpc_release = nfs4_free_reclaim_complete_data,
5305 };
5306
5307 /*
5308  * Issue a global reclaim complete.
5309  */
5310 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5311 {
5312         struct nfs4_reclaim_complete_data *calldata;
5313         struct rpc_task *task;
5314         struct rpc_message msg = {
5315                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5316         };
5317         struct rpc_task_setup task_setup_data = {
5318                 .rpc_client = clp->cl_rpcclient,
5319                 .rpc_message = &msg,
5320                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5321                 .flags = RPC_TASK_ASYNC,
5322         };
5323         int status = -ENOMEM;
5324
5325         dprintk("--> %s\n", __func__);
5326         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5327         if (calldata == NULL)
5328                 goto out;
5329         calldata->clp = clp;
5330         calldata->arg.one_fs = 0;
5331         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5332
5333         msg.rpc_argp = &calldata->arg;
5334         msg.rpc_resp = &calldata->res;
5335         task_setup_data.callback_data = calldata;
5336         task = rpc_run_task(&task_setup_data);
5337         if (IS_ERR(task)) {
5338                 status = PTR_ERR(task);
5339                 goto out;
5340         }
5341         rpc_put_task(task);
5342         return 0;
5343 out:
5344         dprintk("<-- %s status=%d\n", __func__, status);
5345         return status;
5346 }
5347 #endif /* CONFIG_NFS_V4_1 */
5348
5349 struct nfs4_state_recovery_ops nfs40_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 = nfs4_init_clientid,
5355         .get_clid_cred  = nfs4_get_setclientid_cred,
5356 };
5357
5358 #if defined(CONFIG_NFS_V4_1)
5359 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5360         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5361         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5362         .recover_open   = nfs4_open_reclaim,
5363         .recover_lock   = nfs4_lock_reclaim,
5364         .establish_clid = nfs41_init_clientid,
5365         .get_clid_cred  = nfs4_get_exchange_id_cred,
5366         .reclaim_complete = nfs41_proc_reclaim_complete,
5367 };
5368 #endif /* CONFIG_NFS_V4_1 */
5369
5370 struct nfs4_state_recovery_ops nfs40_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 = nfs4_init_clientid,
5376         .get_clid_cred  = nfs4_get_setclientid_cred,
5377 };
5378
5379 #if defined(CONFIG_NFS_V4_1)
5380 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5381         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5382         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5383         .recover_open   = nfs4_open_expired,
5384         .recover_lock   = nfs4_lock_expired,
5385         .establish_clid = nfs41_init_clientid,
5386         .get_clid_cred  = nfs4_get_exchange_id_cred,
5387 };
5388 #endif /* CONFIG_NFS_V4_1 */
5389
5390 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5391         .sched_state_renewal = nfs4_proc_async_renew,
5392         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5393         .renew_lease = nfs4_proc_renew,
5394 };
5395
5396 #if defined(CONFIG_NFS_V4_1)
5397 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5398         .sched_state_renewal = nfs41_proc_async_sequence,
5399         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5400         .renew_lease = nfs4_proc_sequence,
5401 };
5402 #endif
5403
5404 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5405         .minor_version = 0,
5406         .call_sync = _nfs4_call_sync,
5407         .validate_stateid = nfs4_validate_delegation_stateid,
5408         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5409         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5410         .state_renewal_ops = &nfs40_state_renewal_ops,
5411 };
5412
5413 #if defined(CONFIG_NFS_V4_1)
5414 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5415         .minor_version = 1,
5416         .call_sync = _nfs4_call_sync_session,
5417         .validate_stateid = nfs41_validate_delegation_stateid,
5418         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5419         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5420         .state_renewal_ops = &nfs41_state_renewal_ops,
5421 };
5422 #endif
5423
5424 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5425         [0] = &nfs_v4_0_minor_ops,
5426 #if defined(CONFIG_NFS_V4_1)
5427         [1] = &nfs_v4_1_minor_ops,
5428 #endif
5429 };
5430
5431 static const struct inode_operations nfs4_file_inode_operations = {
5432         .permission     = nfs_permission,
5433         .getattr        = nfs_getattr,
5434         .setattr        = nfs_setattr,
5435         .getxattr       = nfs4_getxattr,
5436         .setxattr       = nfs4_setxattr,
5437         .listxattr      = nfs4_listxattr,
5438 };
5439
5440 const struct nfs_rpc_ops nfs_v4_clientops = {
5441         .version        = 4,                    /* protocol version */
5442         .dentry_ops     = &nfs4_dentry_operations,
5443         .dir_inode_ops  = &nfs4_dir_inode_operations,
5444         .file_inode_ops = &nfs4_file_inode_operations,
5445         .getroot        = nfs4_proc_get_root,
5446         .getattr        = nfs4_proc_getattr,
5447         .setattr        = nfs4_proc_setattr,
5448         .lookupfh       = nfs4_proc_lookupfh,
5449         .lookup         = nfs4_proc_lookup,
5450         .access         = nfs4_proc_access,
5451         .readlink       = nfs4_proc_readlink,
5452         .create         = nfs4_proc_create,
5453         .remove         = nfs4_proc_remove,
5454         .unlink_setup   = nfs4_proc_unlink_setup,
5455         .unlink_done    = nfs4_proc_unlink_done,
5456         .rename         = nfs4_proc_rename,
5457         .link           = nfs4_proc_link,
5458         .symlink        = nfs4_proc_symlink,
5459         .mkdir          = nfs4_proc_mkdir,
5460         .rmdir          = nfs4_proc_remove,
5461         .readdir        = nfs4_proc_readdir,
5462         .mknod          = nfs4_proc_mknod,
5463         .statfs         = nfs4_proc_statfs,
5464         .fsinfo         = nfs4_proc_fsinfo,
5465         .pathconf       = nfs4_proc_pathconf,
5466         .set_capabilities = nfs4_server_capabilities,
5467         .decode_dirent  = nfs4_decode_dirent,
5468         .read_setup     = nfs4_proc_read_setup,
5469         .read_done      = nfs4_read_done,
5470         .write_setup    = nfs4_proc_write_setup,
5471         .write_done     = nfs4_write_done,
5472         .commit_setup   = nfs4_proc_commit_setup,
5473         .commit_done    = nfs4_commit_done,
5474         .lock           = nfs4_proc_lock,
5475         .clear_acl_cache = nfs4_zap_acl_attr,
5476         .close_context  = nfs4_close_context,
5477 };
5478
5479 /*
5480  * Local variables:
5481  *  c-basic-offset: 8
5482  * End:
5483  */