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                         FATTR4_WORD1_TIME_DELTA
 133                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 134 };
 135
 136 const u32 nfs4_fs_locations_bitmap[2] = {
 137         FATTR4_WORD0_TYPE
 138         | FATTR4_WORD0_CHANGE
 139         | FATTR4_WORD0_SIZE
 140         | FATTR4_WORD0_FSID
 141         | FATTR4_WORD0_FILEID
 142         | FATTR4_WORD0_FS_LOCATIONS,
 143         FATTR4_WORD1_MODE
 144         | FATTR4_WORD1_NUMLINKS
 145         | FATTR4_WORD1_OWNER
 146         | FATTR4_WORD1_OWNER_GROUP
 147         | FATTR4_WORD1_RAWDEV
 148         | FATTR4_WORD1_SPACE_USED
 149         | FATTR4_WORD1_TIME_ACCESS
 150         | FATTR4_WORD1_TIME_METADATA
 151         | FATTR4_WORD1_TIME_MODIFY
 152         | FATTR4_WORD1_MOUNTED_ON_FILEID
 153 };
 154
 155 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 156                 struct nfs4_readdir_arg *readdir)
 157 {
 158         __be32 *start, *p;
 159
 160         BUG_ON(readdir->count < 80);
 161         if (cookie > 2) {
 162                 readdir->cookie = cookie;
 163                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 164                 return;
 165         }
 166
 167         readdir->cookie = 0;
 168         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 169         if (cookie == 2)
 170                 return;
 171
 172         /*
 173          * NFSv4 servers do not return entries for '.' and '..'
 174          * Therefore, we fake these entries here.  We let '.'
 175          * have cookie 0 and '..' have cookie 1.  Note that
 176          * when talking to the server, we always send cookie 0
 177          * instead of 1 or 2.
 178          */
 179         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 180
 181         if (cookie == 0) {
 182                 *p++ = xdr_one;                                  /* next */
 183                 *p++ = xdr_zero;                   /* cookie, first word */
 184                 *p++ = xdr_one;                   /* cookie, second word */
 185                 *p++ = xdr_one;                             /* entry len */
 186                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 187                 p++;
 188                 *p++ = xdr_one;                         /* bitmap length */
 189                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 190                 *p++ = htonl(8);              /* attribute buffer length */
 191                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 192         }
 193
 194         *p++ = xdr_one;                                  /* next */
 195         *p++ = xdr_zero;                   /* cookie, first word */
 196         *p++ = xdr_two;                   /* cookie, second word */
 197         *p++ = xdr_two;                             /* entry len */
 198         memcpy(p, "..\0\0", 4);                         /* entry */
 199         p++;
 200         *p++ = xdr_one;                         /* bitmap length */
 201         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202         *p++ = htonl(8);              /* attribute buffer length */
 203         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 204
 205         readdir->pgbase = (char *)p - (char *)start;
 206         readdir->count -= readdir->pgbase;
 207         kunmap_atomic(start, KM_USER0);
 208 }
 209
 210 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 211 {
 212         int res;
 213
 214         might_sleep();
 215
 216         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 217                         nfs_wait_bit_killable, TASK_KILLABLE);
 218         return res;
 219 }
 220
 221 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 222 {
 223         int res = 0;
 224
 225         might_sleep();
 226
 227         if (*timeout <= 0)
 228                 *timeout = NFS4_POLL_RETRY_MIN;
 229         if (*timeout > NFS4_POLL_RETRY_MAX)
 230                 *timeout = NFS4_POLL_RETRY_MAX;
 231         schedule_timeout_killable(*timeout);
 232         if (fatal_signal_pending(current))
 233                 res = -ERESTARTSYS;
 234         *timeout <<= 1;
 235         return res;
 236 }
 237
 238 /* This is the error handling routine for processes that are allowed
 239  * to sleep.
 240  */
 241 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 242 {
 243         struct nfs_client *clp = server->nfs_client;
 244         struct nfs4_state *state = exception->state;
 245         int ret = errorcode;
 246
 247         exception->retry = 0;
 248         switch(errorcode) {
 249                 case 0:
 250                         return 0;
 251                 case -NFS4ERR_ADMIN_REVOKED:
 252                 case -NFS4ERR_BAD_STATEID:
 253                 case -NFS4ERR_OPENMODE:
 254                         if (state == NULL)
 255                                 break;
 256                         nfs4_state_mark_reclaim_nograce(clp, state);
 257                         goto do_state_recovery;
 258                 case -NFS4ERR_STALE_STATEID:
 259                 case -NFS4ERR_STALE_CLIENTID:
 260                 case -NFS4ERR_EXPIRED:
 261                         goto do_state_recovery;
 262 #if defined(CONFIG_NFS_V4_1)
 263                 case -NFS4ERR_BADSESSION:
 264                 case -NFS4ERR_BADSLOT:
 265                 case -NFS4ERR_BAD_HIGH_SLOT:
 266                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 267                 case -NFS4ERR_DEADSESSION:
 268                 case -NFS4ERR_SEQ_FALSE_RETRY:
 269                 case -NFS4ERR_SEQ_MISORDERED:
 270                         dprintk("%s ERROR: %d Reset session\n", __func__,
 271                                 errorcode);
 272                         nfs4_schedule_state_recovery(clp);
 273                         exception->retry = 1;
 274                         break;
 275 #endif /* defined(CONFIG_NFS_V4_1) */
 276                 case -NFS4ERR_FILE_OPEN:
 277                         if (exception->timeout > HZ) {
 278                                 /* We have retried a decent amount, time to
 279                                  * fail
 280                                  */
 281                                 ret = -EBUSY;
 282                                 break;
 283                         }
 284                 case -NFS4ERR_GRACE:
 285                 case -NFS4ERR_DELAY:
 286                 case -EKEYEXPIRED:
 287                         ret = nfs4_delay(server->client, &exception->timeout);
 288                         if (ret != 0)
 289                                 break;
 290                 case -NFS4ERR_OLD_STATEID:
 291                         exception->retry = 1;
 292         }
 293         /* We failed to handle the error */
 294         return nfs4_map_errors(ret);
 295 do_state_recovery:
 296         nfs4_schedule_state_recovery(clp);
 297         ret = nfs4_wait_clnt_recover(clp);
 298         if (ret == 0)
 299                 exception->retry = 1;
 300         return ret;
 301 }
 302
 303
 304 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 305 {
 306         spin_lock(&clp->cl_lock);
 307         if (time_before(clp->cl_last_renewal,timestamp))
 308                 clp->cl_last_renewal = timestamp;
 309         spin_unlock(&clp->cl_lock);
 310 }
 311
 312 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 313 {
 314         do_renew_lease(server->nfs_client, timestamp);
 315 }
 316
 317 #if defined(CONFIG_NFS_V4_1)
 318
 319 /*
 320  * nfs4_free_slot - free a slot and efficiently update slot table.
 321  *
 322  * freeing a slot is trivially done by clearing its respective bit
 323  * in the bitmap.
 324  * If the freed slotid equals highest_used_slotid we want to update it
 325  * so that the server would be able to size down the slot table if needed,
 326  * otherwise we know that the highest_used_slotid is still in use.
 327  * When updating highest_used_slotid there may be "holes" in the bitmap
 328  * so we need to scan down from highest_used_slotid to 0 looking for the now
 329  * highest slotid in use.
 330  * If none found, highest_used_slotid is set to -1.
 331  *
 332  * Must be called while holding tbl->slot_tbl_lock
 333  */
 334 static void
 335 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 336 {
 337         int free_slotid = free_slot - tbl->slots;
 338         int slotid = free_slotid;
 339
 340         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 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_slot) {
 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_slot);
 391         nfs41_check_drain_session_complete(res->sr_session);
 392         spin_unlock(&tbl->slot_tbl_lock);
 393         res->sr_slot = NULL;
 394 }
 395
 396 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 397 {
 398         unsigned long timestamp;
 399         struct nfs_client *clp;
 400
 401         /*
 402          * sr_status remains 1 if an RPC level error occurred. The server
 403          * may or may not have processed the sequence operation..
 404          * Proceed as if the server received and processed the sequence
 405          * operation.
 406          */
 407         if (res->sr_status == 1)
 408                 res->sr_status = NFS_OK;
 409
 410         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 411         if (!res->sr_slot)
 412                 goto out;
 413
 414         /* Check the SEQUENCE operation status */
 415         switch (res->sr_status) {
 416         case 0:
 417                 /* Update the slot's sequence and clientid lease timer */
 418                 ++res->sr_slot->seq_nr;
 419                 timestamp = res->sr_renewal_time;
 420                 clp = res->sr_session->clp;
 421                 do_renew_lease(clp, timestamp);
 422                 /* Check sequence flags */
 423                 if (atomic_read(&clp->cl_count) > 1)
 424                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 425                 break;
 426         case -NFS4ERR_DELAY:
 427                 /* The server detected a resend of the RPC call and
 428                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 429                  * of RFC5661.
 430                  */
 431                 dprintk("%s: slot=%ld seq=%d: Operation in progress\n",
 432                         __func__,
 433                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 434                         res->sr_slot->seq_nr);
 435                 goto out_retry;
 436         default:
 437                 /* Just update the slot sequence no. */
 438                 ++res->sr_slot->seq_nr;
 439         }
 440 out:
 441         /* The session may be reset by one of the error handlers. */
 442         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 443         nfs41_sequence_free_slot(res);
 444         return 1;
 445 out_retry:
 446         if (!rpc_restart_call(task))
 447                 goto out;
 448         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 449         return 0;
 450 }
 451
 452 static int nfs4_sequence_done(struct rpc_task *task,
 453                                struct nfs4_sequence_res *res)
 454 {
 455         if (res->sr_session == NULL)
 456                 return 1;
 457         return nfs41_sequence_done(task, res);
 458 }
 459
 460 /*
 461  * nfs4_find_slot - efficiently look for a free slot
 462  *
 463  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 464  * If found, we mark the slot as used, update the highest_used_slotid,
 465  * and respectively set up the sequence operation args.
 466  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 467  *
 468  * Note: must be called with under the slot_tbl_lock.
 469  */
 470 static u8
 471 nfs4_find_slot(struct nfs4_slot_table *tbl)
 472 {
 473         int slotid;
 474         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 475         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 476
 477         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 478                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 479                 tbl->max_slots);
 480         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 481         if (slotid >= tbl->max_slots)
 482                 goto out;
 483         __set_bit(slotid, tbl->used_slots);
 484         if (slotid > tbl->highest_used_slotid)
 485                 tbl->highest_used_slotid = slotid;
 486         ret_id = slotid;
 487 out:
 488         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 489                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 490         return ret_id;
 491 }
 492
 493 static int nfs41_setup_sequence(struct nfs4_session *session,
 494                                 struct nfs4_sequence_args *args,
 495                                 struct nfs4_sequence_res *res,
 496                                 int cache_reply,
 497                                 struct rpc_task *task)
 498 {
 499         struct nfs4_slot *slot;
 500         struct nfs4_slot_table *tbl;
 501         u8 slotid;
 502
 503         dprintk("--> %s\n", __func__);
 504         /* slot already allocated? */
 505         if (res->sr_slot != NULL)
 506                 return 0;
 507
 508         tbl = &session->fc_slot_table;
 509
 510         spin_lock(&tbl->slot_tbl_lock);
 511         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 512             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 513                 /*
 514                  * The state manager will wait until the slot table is empty.
 515                  * Schedule the reset thread
 516                  */
 517                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 518                 spin_unlock(&tbl->slot_tbl_lock);
 519                 dprintk("%s Schedule Session Reset\n", __func__);
 520                 return -EAGAIN;
 521         }
 522
 523         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 524             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 525                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 526                 spin_unlock(&tbl->slot_tbl_lock);
 527                 dprintk("%s enforce FIFO order\n", __func__);
 528                 return -EAGAIN;
 529         }
 530
 531         slotid = nfs4_find_slot(tbl);
 532         if (slotid == NFS4_MAX_SLOT_TABLE) {
 533                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 534                 spin_unlock(&tbl->slot_tbl_lock);
 535                 dprintk("<-- %s: no free slots\n", __func__);
 536                 return -EAGAIN;
 537         }
 538         spin_unlock(&tbl->slot_tbl_lock);
 539
 540         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 541         slot = tbl->slots + slotid;
 542         args->sa_session = session;
 543         args->sa_slotid = slotid;
 544         args->sa_cache_this = cache_reply;
 545
 546         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 547
 548         res->sr_session = session;
 549         res->sr_slot = slot;
 550         res->sr_renewal_time = jiffies;
 551         res->sr_status_flags = 0;
 552         /*
 553          * sr_status is only set in decode_sequence, and so will remain
 554          * set to 1 if an rpc level failure occurs.
 555          */
 556         res->sr_status = 1;
 557         return 0;
 558 }
 559
 560 int nfs4_setup_sequence(const struct nfs_server *server,
 561                         struct nfs4_sequence_args *args,
 562                         struct nfs4_sequence_res *res,
 563                         int cache_reply,
 564                         struct rpc_task *task)
 565 {
 566         struct nfs4_session *session = nfs4_get_session(server);
 567         int ret = 0;
 568
 569         if (session == NULL) {
 570                 args->sa_session = NULL;
 571                 res->sr_session = NULL;
 572                 goto out;
 573         }
 574
 575         dprintk("--> %s clp %p session %p sr_slot %ld\n",
 576                 __func__, session->clp, session, res->sr_slot ?
 577                         res->sr_slot - session->fc_slot_table.slots : -1);
 578
 579         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 580                                    task);
 581 out:
 582         dprintk("<-- %s status=%d\n", __func__, ret);
 583         return ret;
 584 }
 585
 586 struct nfs41_call_sync_data {
 587         const struct nfs_server *seq_server;
 588         struct nfs4_sequence_args *seq_args;
 589         struct nfs4_sequence_res *seq_res;
 590         int cache_reply;
 591 };
 592
 593 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 594 {
 595         struct nfs41_call_sync_data *data = calldata;
 596
 597         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 598
 599         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 600                                 data->seq_res, data->cache_reply, task))
 601                 return;
 602         rpc_call_start(task);
 603 }
 604
 605 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 606 {
 607         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 608         nfs41_call_sync_prepare(task, calldata);
 609 }
 610
 611 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 612 {
 613         struct nfs41_call_sync_data *data = calldata;
 614
 615         nfs41_sequence_done(task, data->seq_res);
 616 }
 617
 618 struct rpc_call_ops nfs41_call_sync_ops = {
 619         .rpc_call_prepare = nfs41_call_sync_prepare,
 620         .rpc_call_done = nfs41_call_sync_done,
 621 };
 622
 623 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 624         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 625         .rpc_call_done = nfs41_call_sync_done,
 626 };
 627
 628 static int nfs4_call_sync_sequence(struct nfs_server *server,
 629                                    struct rpc_message *msg,
 630                                    struct nfs4_sequence_args *args,
 631                                    struct nfs4_sequence_res *res,
 632                                    int cache_reply,
 633                                    int privileged)
 634 {
 635         int ret;
 636         struct rpc_task *task;
 637         struct nfs41_call_sync_data data = {
 638                 .seq_server = server,
 639                 .seq_args = args,
 640                 .seq_res = res,
 641                 .cache_reply = cache_reply,
 642         };
 643         struct rpc_task_setup task_setup = {
 644                 .rpc_client = server->client,
 645                 .rpc_message = msg,
 646                 .callback_ops = &nfs41_call_sync_ops,
 647                 .callback_data = &data
 648         };
 649
 650         res->sr_slot = NULL;
 651         if (privileged)
 652                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 653         task = rpc_run_task(&task_setup);
 654         if (IS_ERR(task))
 655                 ret = PTR_ERR(task);
 656         else {
 657                 ret = task->tk_status;
 658                 rpc_put_task(task);
 659         }
 660         return ret;
 661 }
 662
 663 int _nfs4_call_sync_session(struct nfs_server *server,
 664                             struct rpc_message *msg,
 665                             struct nfs4_sequence_args *args,
 666                             struct nfs4_sequence_res *res,
 667                             int cache_reply)
 668 {
 669         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 670 }
 671
 672 #else
 673 static int nfs4_sequence_done(struct rpc_task *task,
 674                                struct nfs4_sequence_res *res)
 675 {
 676         return 1;
 677 }
 678 #endif /* CONFIG_NFS_V4_1 */
 679
 680 int _nfs4_call_sync(struct nfs_server *server,
 681                     struct rpc_message *msg,
 682                     struct nfs4_sequence_args *args,
 683                     struct nfs4_sequence_res *res,
 684                     int cache_reply)
 685 {
 686         args->sa_session = res->sr_session = NULL;
 687         return rpc_call_sync(server->client, msg, 0);
 688 }
 689
 690 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 691         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 692                         &(res)->seq_res, (cache_reply))
 693
 694 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 695 {
 696         struct nfs_inode *nfsi = NFS_I(dir);
 697
 698         spin_lock(&dir->i_lock);
 699         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 700         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 701                 nfs_force_lookup_revalidate(dir);
 702         nfsi->change_attr = cinfo->after;
 703         spin_unlock(&dir->i_lock);
 704 }
 705
 706 struct nfs4_opendata {
 707         struct kref kref;
 708         struct nfs_openargs o_arg;
 709         struct nfs_openres o_res;
 710         struct nfs_open_confirmargs c_arg;
 711         struct nfs_open_confirmres c_res;
 712         struct nfs_fattr f_attr;
 713         struct nfs_fattr dir_attr;
 714         struct path path;
 715         struct dentry *dir;
 716         struct nfs4_state_owner *owner;
 717         struct nfs4_state *state;
 718         struct iattr attrs;
 719         unsigned long timestamp;
 720         unsigned int rpc_done : 1;
 721         int rpc_status;
 722         int cancelled;
 723 };
 724
 725
 726 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 727 {
 728         p->o_res.f_attr = &p->f_attr;
 729         p->o_res.dir_attr = &p->dir_attr;
 730         p->o_res.seqid = p->o_arg.seqid;
 731         p->c_res.seqid = p->c_arg.seqid;
 732         p->o_res.server = p->o_arg.server;
 733         nfs_fattr_init(&p->f_attr);
 734         nfs_fattr_init(&p->dir_attr);
 735 }
 736
 737 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 738                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 739                 const struct iattr *attrs,
 740                 gfp_t gfp_mask)
 741 {
 742         struct dentry *parent = dget_parent(path->dentry);
 743         struct inode *dir = parent->d_inode;
 744         struct nfs_server *server = NFS_SERVER(dir);
 745         struct nfs4_opendata *p;
 746
 747         p = kzalloc(sizeof(*p), gfp_mask);
 748         if (p == NULL)
 749                 goto err;
 750         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 751         if (p->o_arg.seqid == NULL)
 752                 goto err_free;
 753         path_get(path);
 754         p->path = *path;
 755         p->dir = parent;
 756         p->owner = sp;
 757         atomic_inc(&sp->so_count);
 758         p->o_arg.fh = NFS_FH(dir);
 759         p->o_arg.open_flags = flags;
 760         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 761         p->o_arg.clientid = server->nfs_client->cl_clientid;
 762         p->o_arg.id = sp->so_owner_id.id;
 763         p->o_arg.name = &p->path.dentry->d_name;
 764         p->o_arg.server = server;
 765         p->o_arg.bitmask = server->attr_bitmask;
 766         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 767         if (flags & O_CREAT) {
 768                 u32 *s;
 769
 770                 p->o_arg.u.attrs = &p->attrs;
 771                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 772                 s = (u32 *) p->o_arg.u.verifier.data;
 773                 s[0] = jiffies;
 774                 s[1] = current->pid;
 775         }
 776         p->c_arg.fh = &p->o_res.fh;
 777         p->c_arg.stateid = &p->o_res.stateid;
 778         p->c_arg.seqid = p->o_arg.seqid;
 779         nfs4_init_opendata_res(p);
 780         kref_init(&p->kref);
 781         return p;
 782 err_free:
 783         kfree(p);
 784 err:
 785         dput(parent);
 786         return NULL;
 787 }
 788
 789 static void nfs4_opendata_free(struct kref *kref)
 790 {
 791         struct nfs4_opendata *p = container_of(kref,
 792                         struct nfs4_opendata, kref);
 793
 794         nfs_free_seqid(p->o_arg.seqid);
 795         if (p->state != NULL)
 796                 nfs4_put_open_state(p->state);
 797         nfs4_put_state_owner(p->owner);
 798         dput(p->dir);
 799         path_put(&p->path);
 800         kfree(p);
 801 }
 802
 803 static void nfs4_opendata_put(struct nfs4_opendata *p)
 804 {
 805         if (p != NULL)
 806                 kref_put(&p->kref, nfs4_opendata_free);
 807 }
 808
 809 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 810 {
 811         int ret;
 812
 813         ret = rpc_wait_for_completion_task(task);
 814         return ret;
 815 }
 816
 817 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 818 {
 819         int ret = 0;
 820
 821         if (open_mode & O_EXCL)
 822                 goto out;
 823         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 824                 case FMODE_READ:
 825                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 826                                 && state->n_rdonly != 0;
 827                         break;
 828                 case FMODE_WRITE:
 829                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 830                                 && state->n_wronly != 0;
 831                         break;
 832                 case FMODE_READ|FMODE_WRITE:
 833                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 834                                 && state->n_rdwr != 0;
 835         }
 836 out:
 837         return ret;
 838 }
 839
 840 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 841 {
 842         if ((delegation->type & fmode) != fmode)
 843                 return 0;
 844         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 845                 return 0;
 846         nfs_mark_delegation_referenced(delegation);
 847         return 1;
 848 }
 849
 850 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 851 {
 852         switch (fmode) {
 853                 case FMODE_WRITE:
 854                         state->n_wronly++;
 855                         break;
 856                 case FMODE_READ:
 857                         state->n_rdonly++;
 858                         break;
 859                 case FMODE_READ|FMODE_WRITE:
 860                         state->n_rdwr++;
 861         }
 862         nfs4_state_set_mode_locked(state, state->state | fmode);
 863 }
 864
 865 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 866 {
 867         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 868                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 869         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 870         switch (fmode) {
 871                 case FMODE_READ:
 872                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 873                         break;
 874                 case FMODE_WRITE:
 875                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 876                         break;
 877                 case FMODE_READ|FMODE_WRITE:
 878                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 879         }
 880 }
 881
 882 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 883 {
 884         write_seqlock(&state->seqlock);
 885         nfs_set_open_stateid_locked(state, stateid, fmode);
 886         write_sequnlock(&state->seqlock);
 887 }
 888
 889 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 890 {
 891         /*
 892          * Protect the call to nfs4_state_set_mode_locked and
 893          * serialise the stateid update
 894          */
 895         write_seqlock(&state->seqlock);
 896         if (deleg_stateid != NULL) {
 897                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 898                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 899         }
 900         if (open_stateid != NULL)
 901                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 902         write_sequnlock(&state->seqlock);
 903         spin_lock(&state->owner->so_lock);
 904         update_open_stateflags(state, fmode);
 905         spin_unlock(&state->owner->so_lock);
 906 }
 907
 908 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 909 {
 910         struct nfs_inode *nfsi = NFS_I(state->inode);
 911         struct nfs_delegation *deleg_cur;
 912         int ret = 0;
 913
 914         fmode &= (FMODE_READ|FMODE_WRITE);
 915
 916         rcu_read_lock();
 917         deleg_cur = rcu_dereference(nfsi->delegation);
 918         if (deleg_cur == NULL)
 919                 goto no_delegation;
 920
 921         spin_lock(&deleg_cur->lock);
 922         if (nfsi->delegation != deleg_cur ||
 923             (deleg_cur->type & fmode) != fmode)
 924                 goto no_delegation_unlock;
 925
 926         if (delegation == NULL)
 927                 delegation = &deleg_cur->stateid;
 928         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 929                 goto no_delegation_unlock;
 930
 931         nfs_mark_delegation_referenced(deleg_cur);
 932         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 933         ret = 1;
 934 no_delegation_unlock:
 935         spin_unlock(&deleg_cur->lock);
 936 no_delegation:
 937         rcu_read_unlock();
 938
 939         if (!ret && open_stateid != NULL) {
 940                 __update_open_stateid(state, open_stateid, NULL, fmode);
 941                 ret = 1;
 942         }
 943
 944         return ret;
 945 }
 946
 947
 948 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 949 {
 950         struct nfs_delegation *delegation;
 951
 952         rcu_read_lock();
 953         delegation = rcu_dereference(NFS_I(inode)->delegation);
 954         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 955                 rcu_read_unlock();
 956                 return;
 957         }
 958         rcu_read_unlock();
 959         nfs_inode_return_delegation(inode);
 960 }
 961
 962 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 963 {
 964         struct nfs4_state *state = opendata->state;
 965         struct nfs_inode *nfsi = NFS_I(state->inode);
 966         struct nfs_delegation *delegation;
 967         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 968         fmode_t fmode = opendata->o_arg.fmode;
 969         nfs4_stateid stateid;
 970         int ret = -EAGAIN;
 971
 972         for (;;) {
 973                 if (can_open_cached(state, fmode, open_mode)) {
 974                         spin_lock(&state->owner->so_lock);
 975                         if (can_open_cached(state, fmode, open_mode)) {
 976                                 update_open_stateflags(state, fmode);
 977                                 spin_unlock(&state->owner->so_lock);
 978                                 goto out_return_state;
 979                         }
 980                         spin_unlock(&state->owner->so_lock);
 981                 }
 982                 rcu_read_lock();
 983                 delegation = rcu_dereference(nfsi->delegation);
 984                 if (delegation == NULL ||
 985                     !can_open_delegated(delegation, fmode)) {
 986                         rcu_read_unlock();
 987                         break;
 988                 }
 989                 /* Save the delegation */
 990                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 991                 rcu_read_unlock();
 992                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 993                 if (ret != 0)
 994                         goto out;
 995                 ret = -EAGAIN;
 996
 997                 /* Try to update the stateid using the delegation */
 998                 if (update_open_stateid(state, NULL, &stateid, fmode))
 999                         goto out_return_state;
1000         }
1001 out:
1002         return ERR_PTR(ret);
1003 out_return_state:
1004         atomic_inc(&state->count);
1005         return state;
1006 }
1007
1008 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1009 {
1010         struct inode *inode;
1011         struct nfs4_state *state = NULL;
1012         struct nfs_delegation *delegation;
1013         int ret;
1014
1015         if (!data->rpc_done) {
1016                 state = nfs4_try_open_cached(data);
1017                 goto out;
1018         }
1019
1020         ret = -EAGAIN;
1021         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1022                 goto err;
1023         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1024         ret = PTR_ERR(inode);
1025         if (IS_ERR(inode))
1026                 goto err;
1027         ret = -ENOMEM;
1028         state = nfs4_get_open_state(inode, data->owner);
1029         if (state == NULL)
1030                 goto err_put_inode;
1031         if (data->o_res.delegation_type != 0) {
1032                 int delegation_flags = 0;
1033
1034                 rcu_read_lock();
1035                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1036                 if (delegation)
1037                         delegation_flags = delegation->flags;
1038                 rcu_read_unlock();
1039                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1040                         nfs_inode_set_delegation(state->inode,
1041                                         data->owner->so_cred,
1042                                         &data->o_res);
1043                 else
1044                         nfs_inode_reclaim_delegation(state->inode,
1045                                         data->owner->so_cred,
1046                                         &data->o_res);
1047         }
1048
1049         update_open_stateid(state, &data->o_res.stateid, NULL,
1050                         data->o_arg.fmode);
1051         iput(inode);
1052 out:
1053         return state;
1054 err_put_inode:
1055         iput(inode);
1056 err:
1057         return ERR_PTR(ret);
1058 }
1059
1060 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1061 {
1062         struct nfs_inode *nfsi = NFS_I(state->inode);
1063         struct nfs_open_context *ctx;
1064
1065         spin_lock(&state->inode->i_lock);
1066         list_for_each_entry(ctx, &nfsi->open_files, list) {
1067                 if (ctx->state != state)
1068                         continue;
1069                 get_nfs_open_context(ctx);
1070                 spin_unlock(&state->inode->i_lock);
1071                 return ctx;
1072         }
1073         spin_unlock(&state->inode->i_lock);
1074         return ERR_PTR(-ENOENT);
1075 }
1076
1077 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1078 {
1079         struct nfs4_opendata *opendata;
1080
1081         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1082         if (opendata == NULL)
1083                 return ERR_PTR(-ENOMEM);
1084         opendata->state = state;
1085         atomic_inc(&state->count);
1086         return opendata;
1087 }
1088
1089 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1090 {
1091         struct nfs4_state *newstate;
1092         int ret;
1093
1094         opendata->o_arg.open_flags = 0;
1095         opendata->o_arg.fmode = fmode;
1096         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1097         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1098         nfs4_init_opendata_res(opendata);
1099         ret = _nfs4_recover_proc_open(opendata);
1100         if (ret != 0)
1101                 return ret;
1102         newstate = nfs4_opendata_to_nfs4_state(opendata);
1103         if (IS_ERR(newstate))
1104                 return PTR_ERR(newstate);
1105         nfs4_close_state(&opendata->path, newstate, fmode);
1106         *res = newstate;
1107         return 0;
1108 }
1109
1110 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1111 {
1112         struct nfs4_state *newstate;
1113         int ret;
1114
1115         /* memory barrier prior to reading state->n_* */
1116         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1117         smp_rmb();
1118         if (state->n_rdwr != 0) {
1119                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1120                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1121                 if (ret != 0)
1122                         return ret;
1123                 if (newstate != state)
1124                         return -ESTALE;
1125         }
1126         if (state->n_wronly != 0) {
1127                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1128                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1129                 if (ret != 0)
1130                         return ret;
1131                 if (newstate != state)
1132                         return -ESTALE;
1133         }
1134         if (state->n_rdonly != 0) {
1135                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1136                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1137                 if (ret != 0)
1138                         return ret;
1139                 if (newstate != state)
1140                         return -ESTALE;
1141         }
1142         /*
1143          * We may have performed cached opens for all three recoveries.
1144          * Check if we need to update the current stateid.
1145          */
1146         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1147             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1148                 write_seqlock(&state->seqlock);
1149                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1150                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1151                 write_sequnlock(&state->seqlock);
1152         }
1153         return 0;
1154 }
1155
1156 /*
1157  * OPEN_RECLAIM:
1158  *      reclaim state on the server after a reboot.
1159  */
1160 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1161 {
1162         struct nfs_delegation *delegation;
1163         struct nfs4_opendata *opendata;
1164         fmode_t delegation_type = 0;
1165         int status;
1166
1167         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1168         if (IS_ERR(opendata))
1169                 return PTR_ERR(opendata);
1170         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1171         opendata->o_arg.fh = NFS_FH(state->inode);
1172         rcu_read_lock();
1173         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1174         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1175                 delegation_type = delegation->type;
1176         rcu_read_unlock();
1177         opendata->o_arg.u.delegation_type = delegation_type;
1178         status = nfs4_open_recover(opendata, state);
1179         nfs4_opendata_put(opendata);
1180         return status;
1181 }
1182
1183 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1184 {
1185         struct nfs_server *server = NFS_SERVER(state->inode);
1186         struct nfs4_exception exception = { };
1187         int err;
1188         do {
1189                 err = _nfs4_do_open_reclaim(ctx, state);
1190                 if (err != -NFS4ERR_DELAY)
1191                         break;
1192                 nfs4_handle_exception(server, err, &exception);
1193         } while (exception.retry);
1194         return err;
1195 }
1196
1197 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1198 {
1199         struct nfs_open_context *ctx;
1200         int ret;
1201
1202         ctx = nfs4_state_find_open_context(state);
1203         if (IS_ERR(ctx))
1204                 return PTR_ERR(ctx);
1205         ret = nfs4_do_open_reclaim(ctx, state);
1206         put_nfs_open_context(ctx);
1207         return ret;
1208 }
1209
1210 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1211 {
1212         struct nfs4_opendata *opendata;
1213         int ret;
1214
1215         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1216         if (IS_ERR(opendata))
1217                 return PTR_ERR(opendata);
1218         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1219         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1220                         sizeof(opendata->o_arg.u.delegation.data));
1221         ret = nfs4_open_recover(opendata, state);
1222         nfs4_opendata_put(opendata);
1223         return ret;
1224 }
1225
1226 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1227 {
1228         struct nfs4_exception exception = { };
1229         struct nfs_server *server = NFS_SERVER(state->inode);
1230         int err;
1231         do {
1232                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1233                 switch (err) {
1234                         case 0:
1235                         case -ENOENT:
1236                         case -ESTALE:
1237                                 goto out;
1238                         case -NFS4ERR_BADSESSION:
1239                         case -NFS4ERR_BADSLOT:
1240                         case -NFS4ERR_BAD_HIGH_SLOT:
1241                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1242                         case -NFS4ERR_DEADSESSION:
1243                                 nfs4_schedule_state_recovery(
1244                                         server->nfs_client);
1245                                 goto out;
1246                         case -NFS4ERR_STALE_CLIENTID:
1247                         case -NFS4ERR_STALE_STATEID:
1248                         case -NFS4ERR_EXPIRED:
1249                                 /* Don't recall a delegation if it was lost */
1250                                 nfs4_schedule_state_recovery(server->nfs_client);
1251                                 goto out;
1252                         case -ERESTARTSYS:
1253                                 /*
1254                                  * The show must go on: exit, but mark the
1255                                  * stateid as needing recovery.
1256                                  */
1257                         case -NFS4ERR_ADMIN_REVOKED:
1258                         case -NFS4ERR_BAD_STATEID:
1259                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1260                         case -EKEYEXPIRED:
1261                                 /*
1262                                  * User RPCSEC_GSS context has expired.
1263                                  * We cannot recover this stateid now, so
1264                                  * skip it and allow recovery thread to
1265                                  * proceed.
1266                                  */
1267                         case -ENOMEM:
1268                                 err = 0;
1269                                 goto out;
1270                 }
1271                 err = nfs4_handle_exception(server, err, &exception);
1272         } while (exception.retry);
1273 out:
1274         return err;
1275 }
1276
1277 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1278 {
1279         struct nfs4_opendata *data = calldata;
1280
1281         data->rpc_status = task->tk_status;
1282         if (data->rpc_status == 0) {
1283                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1284                                 sizeof(data->o_res.stateid.data));
1285                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1286                 renew_lease(data->o_res.server, data->timestamp);
1287                 data->rpc_done = 1;
1288         }
1289 }
1290
1291 static void nfs4_open_confirm_release(void *calldata)
1292 {
1293         struct nfs4_opendata *data = calldata;
1294         struct nfs4_state *state = NULL;
1295
1296         /* If this request hasn't been cancelled, do nothing */
1297         if (data->cancelled == 0)
1298                 goto out_free;
1299         /* In case of error, no cleanup! */
1300         if (!data->rpc_done)
1301                 goto out_free;
1302         state = nfs4_opendata_to_nfs4_state(data);
1303         if (!IS_ERR(state))
1304                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1305 out_free:
1306         nfs4_opendata_put(data);
1307 }
1308
1309 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1310         .rpc_call_done = nfs4_open_confirm_done,
1311         .rpc_release = nfs4_open_confirm_release,
1312 };
1313
1314 /*
1315  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1316  */
1317 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1318 {
1319         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1320         struct rpc_task *task;
1321         struct  rpc_message msg = {
1322                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1323                 .rpc_argp = &data->c_arg,
1324                 .rpc_resp = &data->c_res,
1325                 .rpc_cred = data->owner->so_cred,
1326         };
1327         struct rpc_task_setup task_setup_data = {
1328                 .rpc_client = server->client,
1329                 .rpc_message = &msg,
1330                 .callback_ops = &nfs4_open_confirm_ops,
1331                 .callback_data = data,
1332                 .workqueue = nfsiod_workqueue,
1333                 .flags = RPC_TASK_ASYNC,
1334         };
1335         int status;
1336
1337         kref_get(&data->kref);
1338         data->rpc_done = 0;
1339         data->rpc_status = 0;
1340         data->timestamp = jiffies;
1341         task = rpc_run_task(&task_setup_data);
1342         if (IS_ERR(task))
1343                 return PTR_ERR(task);
1344         status = nfs4_wait_for_completion_rpc_task(task);
1345         if (status != 0) {
1346                 data->cancelled = 1;
1347                 smp_wmb();
1348         } else
1349                 status = data->rpc_status;
1350         rpc_put_task(task);
1351         return status;
1352 }
1353
1354 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1355 {
1356         struct nfs4_opendata *data = calldata;
1357         struct nfs4_state_owner *sp = data->owner;
1358
1359         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1360                 return;
1361         /*
1362          * Check if we still need to send an OPEN call, or if we can use
1363          * a delegation instead.
1364          */
1365         if (data->state != NULL) {
1366                 struct nfs_delegation *delegation;
1367
1368                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1369                         goto out_no_action;
1370                 rcu_read_lock();
1371                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1372                 if (delegation != NULL &&
1373                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1374                         rcu_read_unlock();
1375                         goto out_no_action;
1376                 }
1377                 rcu_read_unlock();
1378         }
1379         /* Update sequence id. */
1380         data->o_arg.id = sp->so_owner_id.id;
1381         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1382         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1383                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1384                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1385         }
1386         data->timestamp = jiffies;
1387         if (nfs4_setup_sequence(data->o_arg.server,
1388                                 &data->o_arg.seq_args,
1389                                 &data->o_res.seq_res, 1, task))
1390                 return;
1391         rpc_call_start(task);
1392         return;
1393 out_no_action:
1394         task->tk_action = NULL;
1395
1396 }
1397
1398 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1399 {
1400         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1401         nfs4_open_prepare(task, calldata);
1402 }
1403
1404 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1405 {
1406         struct nfs4_opendata *data = calldata;
1407
1408         data->rpc_status = task->tk_status;
1409
1410         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1411                 return;
1412
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                         nfs4_handle_exception(server, err, &exception);
1615                         err = 0;
1616                 }
1617         } while (exception.retry);
1618 out:
1619         return err;
1620 }
1621
1622 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1623 {
1624         struct nfs_open_context *ctx;
1625         int ret;
1626
1627         ctx = nfs4_state_find_open_context(state);
1628         if (IS_ERR(ctx))
1629                 return PTR_ERR(ctx);
1630         ret = nfs4_do_open_expired(ctx, state);
1631         put_nfs_open_context(ctx);
1632         return ret;
1633 }
1634
1635 /*
1636  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1637  * fields corresponding to attributes that were used to store the verifier.
1638  * Make sure we clobber those fields in the later setattr call
1639  */
1640 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1641 {
1642         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1643             !(sattr->ia_valid & ATTR_ATIME_SET))
1644                 sattr->ia_valid |= ATTR_ATIME;
1645
1646         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1647             !(sattr->ia_valid & ATTR_MTIME_SET))
1648                 sattr->ia_valid |= ATTR_MTIME;
1649 }
1650
1651 /*
1652  * Returns a referenced nfs4_state
1653  */
1654 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)
1655 {
1656         struct nfs4_state_owner  *sp;
1657         struct nfs4_state     *state = NULL;
1658         struct nfs_server       *server = NFS_SERVER(dir);
1659         struct nfs4_opendata *opendata;
1660         int status;
1661
1662         /* Protect against reboot recovery conflicts */
1663         status = -ENOMEM;
1664         if (!(sp = nfs4_get_state_owner(server, cred))) {
1665                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1666                 goto out_err;
1667         }
1668         status = nfs4_recover_expired_lease(server);
1669         if (status != 0)
1670                 goto err_put_state_owner;
1671         if (path->dentry->d_inode != NULL)
1672                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1673         status = -ENOMEM;
1674         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1675         if (opendata == NULL)
1676                 goto err_put_state_owner;
1677
1678         if (path->dentry->d_inode != NULL)
1679                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1680
1681         status = _nfs4_proc_open(opendata);
1682         if (status != 0)
1683                 goto err_opendata_put;
1684
1685         state = nfs4_opendata_to_nfs4_state(opendata);
1686         status = PTR_ERR(state);
1687         if (IS_ERR(state))
1688                 goto err_opendata_put;
1689         if (server->caps & NFS_CAP_POSIX_LOCK)
1690                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1691
1692         if (opendata->o_arg.open_flags & O_EXCL) {
1693                 nfs4_exclusive_attrset(opendata, sattr);
1694
1695                 nfs_fattr_init(opendata->o_res.f_attr);
1696                 status = nfs4_do_setattr(state->inode, cred,
1697                                 opendata->o_res.f_attr, sattr,
1698                                 state);
1699                 if (status == 0)
1700                         nfs_setattr_update_inode(state->inode, sattr);
1701                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1702         }
1703         nfs4_opendata_put(opendata);
1704         nfs4_put_state_owner(sp);
1705         *res = state;
1706         return 0;
1707 err_opendata_put:
1708         nfs4_opendata_put(opendata);
1709 err_put_state_owner:
1710         nfs4_put_state_owner(sp);
1711 out_err:
1712         *res = NULL;
1713         return status;
1714 }
1715
1716
1717 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)
1718 {
1719         struct nfs4_exception exception = { };
1720         struct nfs4_state *res;
1721         int status;
1722
1723         do {
1724                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1725                 if (status == 0)
1726                         break;
1727                 /* NOTE: BAD_SEQID means the server and client disagree about the
1728                  * book-keeping w.r.t. state-changing operations
1729                  * (OPEN/CLOSE/LOCK/LOCKU...)
1730                  * It is actually a sign of a bug on the client or on the server.
1731                  *
1732                  * If we receive a BAD_SEQID error in the particular case of
1733                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1734                  * have unhashed the old state_owner for us, and that we can
1735                  * therefore safely retry using a new one. We should still warn
1736                  * the user though...
1737                  */
1738                 if (status == -NFS4ERR_BAD_SEQID) {
1739                         printk(KERN_WARNING "NFS: v4 server %s "
1740                                         " returned a bad sequence-id error!\n",
1741                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1742                         exception.retry = 1;
1743                         continue;
1744                 }
1745                 /*
1746                  * BAD_STATEID on OPEN means that the server cancelled our
1747                  * state before it received the OPEN_CONFIRM.
1748                  * Recover by retrying the request as per the discussion
1749                  * on Page 181 of RFC3530.
1750                  */
1751                 if (status == -NFS4ERR_BAD_STATEID) {
1752                         exception.retry = 1;
1753                         continue;
1754                 }
1755                 if (status == -EAGAIN) {
1756                         /* We must have found a delegation */
1757                         exception.retry = 1;
1758                         continue;
1759                 }
1760                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1761                                         status, &exception));
1762         } while (exception.retry);
1763         return res;
1764 }
1765
1766 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1767                             struct nfs_fattr *fattr, struct iattr *sattr,
1768                             struct nfs4_state *state)
1769 {
1770         struct nfs_server *server = NFS_SERVER(inode);
1771         struct nfs_setattrargs  arg = {
1772                 .fh             = NFS_FH(inode),
1773                 .iap            = sattr,
1774                 .server         = server,
1775                 .bitmask = server->attr_bitmask,
1776         };
1777         struct nfs_setattrres  res = {
1778                 .fattr          = fattr,
1779                 .server         = server,
1780         };
1781         struct rpc_message msg = {
1782                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1783                 .rpc_argp       = &arg,
1784                 .rpc_resp       = &res,
1785                 .rpc_cred       = cred,
1786         };
1787         unsigned long timestamp = jiffies;
1788         int status;
1789
1790         nfs_fattr_init(fattr);
1791
1792         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1793                 /* Use that stateid */
1794         } else if (state != NULL) {
1795                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1796         } else
1797                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1798
1799         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1800         if (status == 0 && state != NULL)
1801                 renew_lease(server, timestamp);
1802         return status;
1803 }
1804
1805 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1806                            struct nfs_fattr *fattr, struct iattr *sattr,
1807                            struct nfs4_state *state)
1808 {
1809         struct nfs_server *server = NFS_SERVER(inode);
1810         struct nfs4_exception exception = { };
1811         int err;
1812         do {
1813                 err = nfs4_handle_exception(server,
1814                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1815                                 &exception);
1816         } while (exception.retry);
1817         return err;
1818 }
1819
1820 struct nfs4_closedata {
1821         struct path path;
1822         struct inode *inode;
1823         struct nfs4_state *state;
1824         struct nfs_closeargs arg;
1825         struct nfs_closeres res;
1826         struct nfs_fattr fattr;
1827         unsigned long timestamp;
1828 };
1829
1830 static void nfs4_free_closedata(void *data)
1831 {
1832         struct nfs4_closedata *calldata = data;
1833         struct nfs4_state_owner *sp = calldata->state->owner;
1834
1835         nfs4_put_open_state(calldata->state);
1836         nfs_free_seqid(calldata->arg.seqid);
1837         nfs4_put_state_owner(sp);
1838         path_put(&calldata->path);
1839         kfree(calldata);
1840 }
1841
1842 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1843                 fmode_t fmode)
1844 {
1845         spin_lock(&state->owner->so_lock);
1846         if (!(fmode & FMODE_READ))
1847                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1848         if (!(fmode & FMODE_WRITE))
1849                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1850         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1851         spin_unlock(&state->owner->so_lock);
1852 }
1853
1854 static void nfs4_close_done(struct rpc_task *task, void *data)
1855 {
1856         struct nfs4_closedata *calldata = data;
1857         struct nfs4_state *state = calldata->state;
1858         struct nfs_server *server = NFS_SERVER(calldata->inode);
1859
1860         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1861                 return;
1862         /* hmm. we are done with the inode, and in the process of freeing
1863          * the state_owner. we keep this around to process errors
1864          */
1865         switch (task->tk_status) {
1866                 case 0:
1867                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1868                         renew_lease(server, calldata->timestamp);
1869                         nfs4_close_clear_stateid_flags(state,
1870                                         calldata->arg.fmode);
1871                         break;
1872                 case -NFS4ERR_STALE_STATEID:
1873                 case -NFS4ERR_OLD_STATEID:
1874                 case -NFS4ERR_BAD_STATEID:
1875                 case -NFS4ERR_EXPIRED:
1876                         if (calldata->arg.fmode == 0)
1877                                 break;
1878                 default:
1879                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1880                                 rpc_restart_call_prepare(task);
1881         }
1882         nfs_release_seqid(calldata->arg.seqid);
1883         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1884 }
1885
1886 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1887 {
1888         struct nfs4_closedata *calldata = data;
1889         struct nfs4_state *state = calldata->state;
1890         int call_close = 0;
1891
1892         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1893                 return;
1894
1895         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1896         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1897         spin_lock(&state->owner->so_lock);
1898         /* Calculate the change in open mode */
1899         if (state->n_rdwr == 0) {
1900                 if (state->n_rdonly == 0) {
1901                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1902                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1903                         calldata->arg.fmode &= ~FMODE_READ;
1904                 }
1905                 if (state->n_wronly == 0) {
1906                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1907                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1908                         calldata->arg.fmode &= ~FMODE_WRITE;
1909                 }
1910         }
1911         spin_unlock(&state->owner->so_lock);
1912
1913         if (!call_close) {
1914                 /* Note: exit _without_ calling nfs4_close_done */
1915                 task->tk_action = NULL;
1916                 return;
1917         }
1918
1919         if (calldata->arg.fmode == 0)
1920                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1921
1922         nfs_fattr_init(calldata->res.fattr);
1923         calldata->timestamp = jiffies;
1924         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1925                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1926                                 1, task))
1927                 return;
1928         rpc_call_start(task);
1929 }
1930
1931 static const struct rpc_call_ops nfs4_close_ops = {
1932         .rpc_call_prepare = nfs4_close_prepare,
1933         .rpc_call_done = nfs4_close_done,
1934         .rpc_release = nfs4_free_closedata,
1935 };
1936
1937 /*
1938  * It is possible for data to be read/written from a mem-mapped file
1939  * after the sys_close call (which hits the vfs layer as a flush).
1940  * This means that we can't safely call nfsv4 close on a file until
1941  * the inode is cleared. This in turn means that we are not good
1942  * NFSv4 citizens - we do not indicate to the server to update the file's
1943  * share state even when we are done with one of the three share
1944  * stateid's in the inode.
1945  *
1946  * NOTE: Caller must be holding the sp->so_owner semaphore!
1947  */
1948 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1949 {
1950         struct nfs_server *server = NFS_SERVER(state->inode);
1951         struct nfs4_closedata *calldata;
1952         struct nfs4_state_owner *sp = state->owner;
1953         struct rpc_task *task;
1954         struct rpc_message msg = {
1955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1956                 .rpc_cred = state->owner->so_cred,
1957         };
1958         struct rpc_task_setup task_setup_data = {
1959                 .rpc_client = server->client,
1960                 .rpc_message = &msg,
1961                 .callback_ops = &nfs4_close_ops,
1962                 .workqueue = nfsiod_workqueue,
1963                 .flags = RPC_TASK_ASYNC,
1964         };
1965         int status = -ENOMEM;
1966
1967         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1968         if (calldata == NULL)
1969                 goto out;
1970         calldata->inode = state->inode;
1971         calldata->state = state;
1972         calldata->arg.fh = NFS_FH(state->inode);
1973         calldata->arg.stateid = &state->open_stateid;
1974         /* Serialization for the sequence id */
1975         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1976         if (calldata->arg.seqid == NULL)
1977                 goto out_free_calldata;
1978         calldata->arg.fmode = 0;
1979         calldata->arg.bitmask = server->cache_consistency_bitmask;
1980         calldata->res.fattr = &calldata->fattr;
1981         calldata->res.seqid = calldata->arg.seqid;
1982         calldata->res.server = server;
1983         path_get(path);
1984         calldata->path = *path;
1985
1986         msg.rpc_argp = &calldata->arg,
1987         msg.rpc_resp = &calldata->res,
1988         task_setup_data.callback_data = calldata;
1989         task = rpc_run_task(&task_setup_data);
1990         if (IS_ERR(task))
1991                 return PTR_ERR(task);
1992         status = 0;
1993         if (wait)
1994                 status = rpc_wait_for_completion_task(task);
1995         rpc_put_task(task);
1996         return status;
1997 out_free_calldata:
1998         kfree(calldata);
1999 out:
2000         nfs4_put_open_state(state);
2001         nfs4_put_state_owner(sp);
2002         return status;
2003 }
2004
2005 static struct inode *
2006 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2007 {
2008         struct nfs4_state *state;
2009
2010         /* Protect against concurrent sillydeletes */
2011         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2012         if (IS_ERR(state))
2013                 return ERR_CAST(state);
2014         ctx->state = state;
2015         return igrab(state->inode);
2016 }
2017
2018 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2019 {
2020         if (ctx->state == NULL)
2021                 return;
2022         if (is_sync)
2023                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2024         else
2025                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2026 }
2027
2028 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2029 {
2030         struct nfs4_server_caps_arg args = {
2031                 .fhandle = fhandle,
2032         };
2033         struct nfs4_server_caps_res res = {};
2034         struct rpc_message msg = {
2035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2036                 .rpc_argp = &args,
2037                 .rpc_resp = &res,
2038         };
2039         int status;
2040
2041         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2042         if (status == 0) {
2043                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2044                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2045                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2046                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2047                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2048                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2049                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2050                         server->caps |= NFS_CAP_ACLS;
2051                 if (res.has_links != 0)
2052                         server->caps |= NFS_CAP_HARDLINKS;
2053                 if (res.has_symlinks != 0)
2054                         server->caps |= NFS_CAP_SYMLINKS;
2055                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2056                         server->caps |= NFS_CAP_FILEID;
2057                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2058                         server->caps |= NFS_CAP_MODE;
2059                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2060                         server->caps |= NFS_CAP_NLINK;
2061                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2062                         server->caps |= NFS_CAP_OWNER;
2063                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2064                         server->caps |= NFS_CAP_OWNER_GROUP;
2065                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2066                         server->caps |= NFS_CAP_ATIME;
2067                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2068                         server->caps |= NFS_CAP_CTIME;
2069                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2070                         server->caps |= NFS_CAP_MTIME;
2071
2072                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2073                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2074                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2075                 server->acl_bitmask = res.acl_bitmask;
2076         }
2077
2078         return status;
2079 }
2080
2081 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2082 {
2083         struct nfs4_exception exception = { };
2084         int err;
2085         do {
2086                 err = nfs4_handle_exception(server,
2087                                 _nfs4_server_capabilities(server, fhandle),
2088                                 &exception);
2089         } while (exception.retry);
2090         return err;
2091 }
2092
2093 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2094                 struct nfs_fsinfo *info)
2095 {
2096         struct nfs4_lookup_root_arg args = {
2097                 .bitmask = nfs4_fattr_bitmap,
2098         };
2099         struct nfs4_lookup_res res = {
2100                 .server = server,
2101                 .fattr = info->fattr,
2102                 .fh = fhandle,
2103         };
2104         struct rpc_message msg = {
2105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2106                 .rpc_argp = &args,
2107                 .rpc_resp = &res,
2108         };
2109
2110         nfs_fattr_init(info->fattr);
2111         return nfs4_call_sync(server, &msg, &args, &res, 0);
2112 }
2113
2114 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2115                 struct nfs_fsinfo *info)
2116 {
2117         struct nfs4_exception exception = { };
2118         int err;
2119         do {
2120                 err = nfs4_handle_exception(server,
2121                                 _nfs4_lookup_root(server, fhandle, info),
2122                                 &exception);
2123         } while (exception.retry);
2124         return err;
2125 }
2126
2127 /*
2128  * get the file handle for the "/" directory on the server
2129  */
2130 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2131                               struct nfs_fsinfo *info)
2132 {
2133         int status;
2134
2135         status = nfs4_lookup_root(server, fhandle, info);
2136         if (status == 0)
2137                 status = nfs4_server_capabilities(server, fhandle);
2138         if (status == 0)
2139                 status = nfs4_do_fsinfo(server, fhandle, info);
2140         return nfs4_map_errors(status);
2141 }
2142
2143 /*
2144  * Get locations and (maybe) other attributes of a referral.
2145  * Note that we'll actually follow the referral later when
2146  * we detect fsid mismatch in inode revalidation
2147  */
2148 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2149 {
2150         int status = -ENOMEM;
2151         struct page *page = NULL;
2152         struct nfs4_fs_locations *locations = NULL;
2153
2154         page = alloc_page(GFP_KERNEL);
2155         if (page == NULL)
2156                 goto out;
2157         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2158         if (locations == NULL)
2159                 goto out;
2160
2161         status = nfs4_proc_fs_locations(dir, name, locations, page);
2162         if (status != 0)
2163                 goto out;
2164         /* Make sure server returned a different fsid for the referral */
2165         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2166                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2167                 status = -EIO;
2168                 goto out;
2169         }
2170
2171         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2172         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2173         if (!fattr->mode)
2174                 fattr->mode = S_IFDIR;
2175         memset(fhandle, 0, sizeof(struct nfs_fh));
2176 out:
2177         if (page)
2178                 __free_page(page);
2179         kfree(locations);
2180         return status;
2181 }
2182
2183 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2184 {
2185         struct nfs4_getattr_arg args = {
2186                 .fh = fhandle,
2187                 .bitmask = server->attr_bitmask,
2188         };
2189         struct nfs4_getattr_res res = {
2190                 .fattr = fattr,
2191                 .server = server,
2192         };
2193         struct rpc_message msg = {
2194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2195                 .rpc_argp = &args,
2196                 .rpc_resp = &res,
2197         };
2198
2199         nfs_fattr_init(fattr);
2200         return nfs4_call_sync(server, &msg, &args, &res, 0);
2201 }
2202
2203 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2204 {
2205         struct nfs4_exception exception = { };
2206         int err;
2207         do {
2208                 err = nfs4_handle_exception(server,
2209                                 _nfs4_proc_getattr(server, fhandle, fattr),
2210                                 &exception);
2211         } while (exception.retry);
2212         return err;
2213 }
2214
2215 /*
2216  * The file is not closed if it is opened due to the a request to change
2217  * the size of the file. The open call will not be needed once the
2218  * VFS layer lookup-intents are implemented.
2219  *
2220  * Close is called when the inode is destroyed.
2221  * If we haven't opened the file for O_WRONLY, we
2222  * need to in the size_change case to obtain a stateid.
2223  *
2224  * Got race?
2225  * Because OPEN is always done by name in nfsv4, it is
2226  * possible that we opened a different file by the same
2227  * name.  We can recognize this race condition, but we
2228  * can't do anything about it besides returning an error.
2229  *
2230  * This will be fixed with VFS changes (lookup-intent).
2231  */
2232 static int
2233 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2234                   struct iattr *sattr)
2235 {
2236         struct inode *inode = dentry->d_inode;
2237         struct rpc_cred *cred = NULL;
2238         struct nfs4_state *state = NULL;
2239         int status;
2240
2241         nfs_fattr_init(fattr);
2242
2243         /* Search for an existing open(O_WRITE) file */
2244         if (sattr->ia_valid & ATTR_FILE) {
2245                 struct nfs_open_context *ctx;
2246
2247                 ctx = nfs_file_open_context(sattr->ia_file);
2248                 if (ctx) {
2249                         cred = ctx->cred;
2250                         state = ctx->state;
2251                 }
2252         }
2253
2254         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2255         if (status == 0)
2256                 nfs_setattr_update_inode(inode, sattr);
2257         return status;
2258 }
2259
2260 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2261                 const struct qstr *name, struct nfs_fh *fhandle,
2262                 struct nfs_fattr *fattr)
2263 {
2264         int                    status;
2265         struct nfs4_lookup_arg args = {
2266                 .bitmask = server->attr_bitmask,
2267                 .dir_fh = dirfh,
2268                 .name = name,
2269         };
2270         struct nfs4_lookup_res res = {
2271                 .server = server,
2272                 .fattr = fattr,
2273                 .fh = fhandle,
2274         };
2275         struct rpc_message msg = {
2276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2277                 .rpc_argp = &args,
2278                 .rpc_resp = &res,
2279         };
2280
2281         nfs_fattr_init(fattr);
2282
2283         dprintk("NFS call  lookupfh %s\n", name->name);
2284         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2285         dprintk("NFS reply lookupfh: %d\n", status);
2286         return status;
2287 }
2288
2289 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2290                               struct qstr *name, struct nfs_fh *fhandle,
2291                               struct nfs_fattr *fattr)
2292 {
2293         struct nfs4_exception exception = { };
2294         int err;
2295         do {
2296                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2297                 /* FIXME: !!!! */
2298                 if (err == -NFS4ERR_MOVED) {
2299                         err = -EREMOTE;
2300                         break;
2301                 }
2302                 err = nfs4_handle_exception(server, err, &exception);
2303         } while (exception.retry);
2304         return err;
2305 }
2306
2307 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2308                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2309 {
2310         int status;
2311
2312         dprintk("NFS call  lookup %s\n", name->name);
2313         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2314         if (status == -NFS4ERR_MOVED)
2315                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2316         dprintk("NFS reply lookup: %d\n", status);
2317         return status;
2318 }
2319
2320 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2321 {
2322         struct nfs4_exception exception = { };
2323         int err;
2324         do {
2325                 err = nfs4_handle_exception(NFS_SERVER(dir),
2326                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2327                                 &exception);
2328         } while (exception.retry);
2329         return err;
2330 }
2331
2332 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2333 {
2334         struct nfs_server *server = NFS_SERVER(inode);
2335         struct nfs4_accessargs args = {
2336                 .fh = NFS_FH(inode),
2337                 .bitmask = server->attr_bitmask,
2338         };
2339         struct nfs4_accessres res = {
2340                 .server = server,
2341         };
2342         struct rpc_message msg = {
2343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2344                 .rpc_argp = &args,
2345                 .rpc_resp = &res,
2346                 .rpc_cred = entry->cred,
2347         };
2348         int mode = entry->mask;
2349         int status;
2350
2351         /*
2352          * Determine which access bits we want to ask for...
2353          */
2354         if (mode & MAY_READ)
2355                 args.access |= NFS4_ACCESS_READ;
2356         if (S_ISDIR(inode->i_mode)) {
2357                 if (mode & MAY_WRITE)
2358                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2359                 if (mode & MAY_EXEC)
2360                         args.access |= NFS4_ACCESS_LOOKUP;
2361         } else {
2362                 if (mode & MAY_WRITE)
2363                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2364                 if (mode & MAY_EXEC)
2365                         args.access |= NFS4_ACCESS_EXECUTE;
2366         }
2367
2368         res.fattr = nfs_alloc_fattr();
2369         if (res.fattr == NULL)
2370                 return -ENOMEM;
2371
2372         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2373         if (!status) {
2374                 entry->mask = 0;
2375                 if (res.access & NFS4_ACCESS_READ)
2376                         entry->mask |= MAY_READ;
2377                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2378                         entry->mask |= MAY_WRITE;
2379                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2380                         entry->mask |= MAY_EXEC;
2381                 nfs_refresh_inode(inode, res.fattr);
2382         }
2383         nfs_free_fattr(res.fattr);
2384         return status;
2385 }
2386
2387 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2388 {
2389         struct nfs4_exception exception = { };
2390         int err;
2391         do {
2392                 err = nfs4_handle_exception(NFS_SERVER(inode),
2393                                 _nfs4_proc_access(inode, entry),
2394                                 &exception);
2395         } while (exception.retry);
2396         return err;
2397 }
2398
2399 /*
2400  * TODO: For the time being, we don't try to get any attributes
2401  * along with any of the zero-copy operations READ, READDIR,
2402  * READLINK, WRITE.
2403  *
2404  * In the case of the first three, we want to put the GETATTR
2405  * after the read-type operation -- this is because it is hard
2406  * to predict the length of a GETATTR response in v4, and thus
2407  * align the READ data correctly.  This means that the GETATTR
2408  * may end up partially falling into the page cache, and we should
2409  * shift it into the 'tail' of the xdr_buf before processing.
2410  * To do this efficiently, we need to know the total length
2411  * of data received, which doesn't seem to be available outside
2412  * of the RPC layer.
2413  *
2414  * In the case of WRITE, we also want to put the GETATTR after
2415  * the operation -- in this case because we want to make sure
2416  * we get the post-operation mtime and size.  This means that
2417  * we can't use xdr_encode_pages() as written: we need a variant
2418  * of it which would leave room in the 'tail' iovec.
2419  *
2420  * Both of these changes to the XDR layer would in fact be quite
2421  * minor, but I decided to leave them for a subsequent patch.
2422  */
2423 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2424                 unsigned int pgbase, unsigned int pglen)
2425 {
2426         struct nfs4_readlink args = {
2427                 .fh       = NFS_FH(inode),
2428                 .pgbase   = pgbase,
2429                 .pglen    = pglen,
2430                 .pages    = &page,
2431         };
2432         struct nfs4_readlink_res res;
2433         struct rpc_message msg = {
2434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2435                 .rpc_argp = &args,
2436                 .rpc_resp = &res,
2437         };
2438
2439         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2440 }
2441
2442 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2443                 unsigned int pgbase, unsigned int pglen)
2444 {
2445         struct nfs4_exception exception = { };
2446         int err;
2447         do {
2448                 err = nfs4_handle_exception(NFS_SERVER(inode),
2449                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2450                                 &exception);
2451         } while (exception.retry);
2452         return err;
2453 }
2454
2455 /*
2456  * Got race?
2457  * We will need to arrange for the VFS layer to provide an atomic open.
2458  * Until then, this create/open method is prone to inefficiency and race
2459  * conditions due to the lookup, create, and open VFS calls from sys_open()
2460  * placed on the wire.
2461  *
2462  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2463  * The file will be opened again in the subsequent VFS open call
2464  * (nfs4_proc_file_open).
2465  *
2466  * The open for read will just hang around to be used by any process that
2467  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2468  */
2469
2470 static int
2471 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2472                  int flags, struct nfs_open_context *ctx)
2473 {
2474         struct path my_path = {
2475                 .dentry = dentry,
2476         };
2477         struct path *path = &my_path;
2478         struct nfs4_state *state;
2479         struct rpc_cred *cred = NULL;
2480         fmode_t fmode = 0;
2481         int status = 0;
2482
2483         if (ctx != NULL) {
2484                 cred = ctx->cred;
2485                 path = &ctx->path;
2486                 fmode = ctx->mode;
2487         }
2488         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2489         d_drop(dentry);
2490         if (IS_ERR(state)) {
2491                 status = PTR_ERR(state);
2492                 goto out;
2493         }
2494         d_add(dentry, igrab(state->inode));
2495         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2496         if (ctx != NULL)
2497                 ctx->state = state;
2498         else
2499                 nfs4_close_sync(path, state, fmode);
2500 out:
2501         return status;
2502 }
2503
2504 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2505 {
2506         struct nfs_server *server = NFS_SERVER(dir);
2507         struct nfs_removeargs args = {
2508                 .fh = NFS_FH(dir),
2509                 .name.len = name->len,
2510                 .name.name = name->name,
2511                 .bitmask = server->attr_bitmask,
2512         };
2513         struct nfs_removeres res = {
2514                 .server = server,
2515         };
2516         struct rpc_message msg = {
2517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2518                 .rpc_argp = &args,
2519                 .rpc_resp = &res,
2520         };
2521         int status = -ENOMEM;
2522
2523         res.dir_attr = nfs_alloc_fattr();
2524         if (res.dir_attr == NULL)
2525                 goto out;
2526
2527         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2528         if (status == 0) {
2529                 update_changeattr(dir, &res.cinfo);
2530                 nfs_post_op_update_inode(dir, res.dir_attr);
2531         }
2532         nfs_free_fattr(res.dir_attr);
2533 out:
2534         return status;
2535 }
2536
2537 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2538 {
2539         struct nfs4_exception exception = { };
2540         int err;
2541         do {
2542                 err = nfs4_handle_exception(NFS_SERVER(dir),
2543                                 _nfs4_proc_remove(dir, name),
2544                                 &exception);
2545         } while (exception.retry);
2546         return err;
2547 }
2548
2549 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2550 {
2551         struct nfs_server *server = NFS_SERVER(dir);
2552         struct nfs_removeargs *args = msg->rpc_argp;
2553         struct nfs_removeres *res = msg->rpc_resp;
2554
2555         args->bitmask = server->cache_consistency_bitmask;
2556         res->server = server;
2557         res->seq_res.sr_slot = NULL;
2558         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2559 }
2560
2561 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2562 {
2563         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2564
2565         if (!nfs4_sequence_done(task, &res->seq_res))
2566                 return 0;
2567         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2568                 return 0;
2569         update_changeattr(dir, &res->cinfo);
2570         nfs_post_op_update_inode(dir, res->dir_attr);
2571         return 1;
2572 }
2573
2574 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2575 {
2576         struct nfs_server *server = NFS_SERVER(dir);
2577         struct nfs_renameargs *arg = msg->rpc_argp;
2578         struct nfs_renameres *res = msg->rpc_resp;
2579
2580         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2581         arg->bitmask = server->attr_bitmask;
2582         res->server = server;
2583 }
2584
2585 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2586                                  struct inode *new_dir)
2587 {
2588         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2589
2590         if (!nfs4_sequence_done(task, &res->seq_res))
2591                 return 0;
2592         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2593                 return 0;
2594
2595         update_changeattr(old_dir, &res->old_cinfo);
2596         nfs_post_op_update_inode(old_dir, res->old_fattr);
2597         update_changeattr(new_dir, &res->new_cinfo);
2598         nfs_post_op_update_inode(new_dir, res->new_fattr);
2599         return 1;
2600 }
2601
2602 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2603                 struct inode *new_dir, struct qstr *new_name)
2604 {
2605         struct nfs_server *server = NFS_SERVER(old_dir);
2606         struct nfs_renameargs arg = {
2607                 .old_dir = NFS_FH(old_dir),
2608                 .new_dir = NFS_FH(new_dir),
2609                 .old_name = old_name,
2610                 .new_name = new_name,
2611                 .bitmask = server->attr_bitmask,
2612         };
2613         struct nfs_renameres res = {
2614                 .server = server,
2615         };
2616         struct rpc_message msg = {
2617                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2618                 .rpc_argp = &arg,
2619                 .rpc_resp = &res,
2620         };
2621         int status = -ENOMEM;
2622
2623         res.old_fattr = nfs_alloc_fattr();
2624         res.new_fattr = nfs_alloc_fattr();
2625         if (res.old_fattr == NULL || res.new_fattr == NULL)
2626                 goto out;
2627
2628         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2629         if (!status) {
2630                 update_changeattr(old_dir, &res.old_cinfo);
2631                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2632                 update_changeattr(new_dir, &res.new_cinfo);
2633                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2634         }
2635 out:
2636         nfs_free_fattr(res.new_fattr);
2637         nfs_free_fattr(res.old_fattr);
2638         return status;
2639 }
2640
2641 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2642                 struct inode *new_dir, struct qstr *new_name)
2643 {
2644         struct nfs4_exception exception = { };
2645         int err;
2646         do {
2647                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2648                                 _nfs4_proc_rename(old_dir, old_name,
2649                                         new_dir, new_name),
2650                                 &exception);
2651         } while (exception.retry);
2652         return err;
2653 }
2654
2655 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2656 {
2657         struct nfs_server *server = NFS_SERVER(inode);
2658         struct nfs4_link_arg arg = {
2659                 .fh     = NFS_FH(inode),
2660                 .dir_fh = NFS_FH(dir),
2661                 .name   = name,
2662                 .bitmask = server->attr_bitmask,
2663         };
2664         struct nfs4_link_res res = {
2665                 .server = server,
2666         };
2667         struct rpc_message msg = {
2668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2669                 .rpc_argp = &arg,
2670                 .rpc_resp = &res,
2671         };
2672         int status = -ENOMEM;
2673
2674         res.fattr = nfs_alloc_fattr();
2675         res.dir_attr = nfs_alloc_fattr();
2676         if (res.fattr == NULL || res.dir_attr == NULL)
2677                 goto out;
2678
2679         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2680         if (!status) {
2681                 update_changeattr(dir, &res.cinfo);
2682                 nfs_post_op_update_inode(dir, res.dir_attr);
2683                 nfs_post_op_update_inode(inode, res.fattr);
2684         }
2685 out:
2686         nfs_free_fattr(res.dir_attr);
2687         nfs_free_fattr(res.fattr);
2688         return status;
2689 }
2690
2691 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2692 {
2693         struct nfs4_exception exception = { };
2694         int err;
2695         do {
2696                 err = nfs4_handle_exception(NFS_SERVER(inode),
2697                                 _nfs4_proc_link(inode, dir, name),
2698                                 &exception);
2699         } while (exception.retry);
2700         return err;
2701 }
2702
2703 struct nfs4_createdata {
2704         struct rpc_message msg;
2705         struct nfs4_create_arg arg;
2706         struct nfs4_create_res res;
2707         struct nfs_fh fh;
2708         struct nfs_fattr fattr;
2709         struct nfs_fattr dir_fattr;
2710 };
2711
2712 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2713                 struct qstr *name, struct iattr *sattr, u32 ftype)
2714 {
2715         struct nfs4_createdata *data;
2716
2717         data = kzalloc(sizeof(*data), GFP_KERNEL);
2718         if (data != NULL) {
2719                 struct nfs_server *server = NFS_SERVER(dir);
2720
2721                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2722                 data->msg.rpc_argp = &data->arg;
2723                 data->msg.rpc_resp = &data->res;
2724                 data->arg.dir_fh = NFS_FH(dir);
2725                 data->arg.server = server;
2726                 data->arg.name = name;
2727                 data->arg.attrs = sattr;
2728                 data->arg.ftype = ftype;
2729                 data->arg.bitmask = server->attr_bitmask;
2730                 data->res.server = server;
2731                 data->res.fh = &data->fh;
2732                 data->res.fattr = &data->fattr;
2733                 data->res.dir_fattr = &data->dir_fattr;
2734                 nfs_fattr_init(data->res.fattr);
2735                 nfs_fattr_init(data->res.dir_fattr);
2736         }
2737         return data;
2738 }
2739
2740 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2741 {
2742         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2743                                     &data->arg, &data->res, 1);
2744         if (status == 0) {
2745                 update_changeattr(dir, &data->res.dir_cinfo);
2746                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2747                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2748         }
2749         return status;
2750 }
2751
2752 static void nfs4_free_createdata(struct nfs4_createdata *data)
2753 {
2754         kfree(data);
2755 }
2756
2757 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2758                 struct page *page, unsigned int len, struct iattr *sattr)
2759 {
2760         struct nfs4_createdata *data;
2761         int status = -ENAMETOOLONG;
2762
2763         if (len > NFS4_MAXPATHLEN)
2764                 goto out;
2765
2766         status = -ENOMEM;
2767         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2768         if (data == NULL)
2769                 goto out;
2770
2771         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2772         data->arg.u.symlink.pages = &page;
2773         data->arg.u.symlink.len = len;
2774
2775         status = nfs4_do_create(dir, dentry, data);
2776
2777         nfs4_free_createdata(data);
2778 out:
2779         return status;
2780 }
2781
2782 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2783                 struct page *page, unsigned int len, struct iattr *sattr)
2784 {
2785         struct nfs4_exception exception = { };
2786         int err;
2787         do {
2788                 err = nfs4_handle_exception(NFS_SERVER(dir),
2789                                 _nfs4_proc_symlink(dir, dentry, page,
2790                                                         len, sattr),
2791                                 &exception);
2792         } while (exception.retry);
2793         return err;
2794 }
2795
2796 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2797                 struct iattr *sattr)
2798 {
2799         struct nfs4_createdata *data;
2800         int status = -ENOMEM;
2801
2802         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2803         if (data == NULL)
2804                 goto out;
2805
2806         status = nfs4_do_create(dir, dentry, data);
2807
2808         nfs4_free_createdata(data);
2809 out:
2810         return status;
2811 }
2812
2813 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2814                 struct iattr *sattr)
2815 {
2816         struct nfs4_exception exception = { };
2817         int err;
2818         do {
2819                 err = nfs4_handle_exception(NFS_SERVER(dir),
2820                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2821                                 &exception);
2822         } while (exception.retry);
2823         return err;
2824 }
2825
2826 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2827                 u64 cookie, struct page **pages, unsigned int count, int plus)
2828 {
2829         struct inode            *dir = dentry->d_inode;
2830         struct nfs4_readdir_arg args = {
2831                 .fh = NFS_FH(dir),
2832                 .pages = pages,
2833                 .pgbase = 0,
2834                 .count = count,
2835                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2836                 .plus = plus,
2837         };
2838         struct nfs4_readdir_res res;
2839         struct rpc_message msg = {
2840                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2841                 .rpc_argp = &args,
2842                 .rpc_resp = &res,
2843                 .rpc_cred = cred,
2844         };
2845         int                     status;
2846
2847         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2848                         dentry->d_parent->d_name.name,
2849                         dentry->d_name.name,
2850                         (unsigned long long)cookie);
2851         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2852         res.pgbase = args.pgbase;
2853         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2854         if (status == 0)
2855                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2856
2857         nfs_invalidate_atime(dir);
2858
2859         dprintk("%s: returns %d\n", __func__, status);
2860         return status;
2861 }
2862
2863 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2864                 u64 cookie, struct page **pages, unsigned int count, int plus)
2865 {
2866         struct nfs4_exception exception = { };
2867         int err;
2868         do {
2869                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2870                                 _nfs4_proc_readdir(dentry, cred, cookie,
2871                                         pages, count, plus),
2872                                 &exception);
2873         } while (exception.retry);
2874         return err;
2875 }
2876
2877 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2878                 struct iattr *sattr, dev_t rdev)
2879 {
2880         struct nfs4_createdata *data;
2881         int mode = sattr->ia_mode;
2882         int status = -ENOMEM;
2883
2884         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2885         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2886
2887         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2888         if (data == NULL)
2889                 goto out;
2890
2891         if (S_ISFIFO(mode))
2892                 data->arg.ftype = NF4FIFO;
2893         else if (S_ISBLK(mode)) {
2894                 data->arg.ftype = NF4BLK;
2895                 data->arg.u.device.specdata1 = MAJOR(rdev);
2896                 data->arg.u.device.specdata2 = MINOR(rdev);
2897         }
2898         else if (S_ISCHR(mode)) {
2899                 data->arg.ftype = NF4CHR;
2900                 data->arg.u.device.specdata1 = MAJOR(rdev);
2901                 data->arg.u.device.specdata2 = MINOR(rdev);
2902         }
2903
2904         status = nfs4_do_create(dir, dentry, data);
2905
2906         nfs4_free_createdata(data);
2907 out:
2908         return status;
2909 }
2910
2911 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2912                 struct iattr *sattr, dev_t rdev)
2913 {
2914         struct nfs4_exception exception = { };
2915         int err;
2916         do {
2917                 err = nfs4_handle_exception(NFS_SERVER(dir),
2918                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2919                                 &exception);
2920         } while (exception.retry);
2921         return err;
2922 }
2923
2924 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2925                  struct nfs_fsstat *fsstat)
2926 {
2927         struct nfs4_statfs_arg args = {
2928                 .fh = fhandle,
2929                 .bitmask = server->attr_bitmask,
2930         };
2931         struct nfs4_statfs_res res = {
2932                 .fsstat = fsstat,
2933         };
2934         struct rpc_message msg = {
2935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2936                 .rpc_argp = &args,
2937                 .rpc_resp = &res,
2938         };
2939
2940         nfs_fattr_init(fsstat->fattr);
2941         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2942 }
2943
2944 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2945 {
2946         struct nfs4_exception exception = { };
2947         int err;
2948         do {
2949                 err = nfs4_handle_exception(server,
2950                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2951                                 &exception);
2952         } while (exception.retry);
2953         return err;
2954 }
2955
2956 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2957                 struct nfs_fsinfo *fsinfo)
2958 {
2959         struct nfs4_fsinfo_arg args = {
2960                 .fh = fhandle,
2961                 .bitmask = server->attr_bitmask,
2962         };
2963         struct nfs4_fsinfo_res res = {
2964                 .fsinfo = fsinfo,
2965         };
2966         struct rpc_message msg = {
2967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2968                 .rpc_argp = &args,
2969                 .rpc_resp = &res,
2970         };
2971
2972         return nfs4_call_sync(server, &msg, &args, &res, 0);
2973 }
2974
2975 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2976 {
2977         struct nfs4_exception exception = { };
2978         int err;
2979
2980         do {
2981                 err = nfs4_handle_exception(server,
2982                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2983                                 &exception);
2984         } while (exception.retry);
2985         return err;
2986 }
2987
2988 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2989 {
2990         nfs_fattr_init(fsinfo->fattr);
2991         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2992 }
2993
2994 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2995                 struct nfs_pathconf *pathconf)
2996 {
2997         struct nfs4_pathconf_arg args = {
2998                 .fh = fhandle,
2999                 .bitmask = server->attr_bitmask,
3000         };
3001         struct nfs4_pathconf_res res = {
3002                 .pathconf = pathconf,
3003         };
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3006                 .rpc_argp = &args,
3007                 .rpc_resp = &res,
3008         };
3009
3010         /* None of the pathconf attributes are mandatory to implement */
3011         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3012                 memset(pathconf, 0, sizeof(*pathconf));
3013                 return 0;
3014         }
3015
3016         nfs_fattr_init(pathconf->fattr);
3017         return nfs4_call_sync(server, &msg, &args, &res, 0);
3018 }
3019
3020 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3021                 struct nfs_pathconf *pathconf)
3022 {
3023         struct nfs4_exception exception = { };
3024         int err;
3025
3026         do {
3027                 err = nfs4_handle_exception(server,
3028                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3029                                 &exception);
3030         } while (exception.retry);
3031         return err;
3032 }
3033
3034 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3035 {
3036         struct nfs_server *server = NFS_SERVER(data->inode);
3037
3038         dprintk("--> %s\n", __func__);
3039
3040         if (!nfs4_sequence_done(task, &data->res.seq_res))
3041                 return -EAGAIN;
3042
3043         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3044                 nfs_restart_rpc(task, server->nfs_client);
3045                 return -EAGAIN;
3046         }
3047
3048         nfs_invalidate_atime(data->inode);
3049         if (task->tk_status > 0)
3050                 renew_lease(server, data->timestamp);
3051         return 0;
3052 }
3053
3054 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3055 {
3056         data->timestamp   = jiffies;
3057         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3058 }
3059
3060 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3061 {
3062         struct inode *inode = data->inode;
3063
3064         if (!nfs4_sequence_done(task, &data->res.seq_res))
3065                 return -EAGAIN;
3066
3067         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3068                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3069                 return -EAGAIN;
3070         }
3071         if (task->tk_status >= 0) {
3072                 renew_lease(NFS_SERVER(inode), data->timestamp);
3073                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3074         }
3075         return 0;
3076 }
3077
3078 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3079 {
3080         struct nfs_server *server = NFS_SERVER(data->inode);
3081
3082         data->args.bitmask = server->cache_consistency_bitmask;
3083         data->res.server = server;
3084         data->timestamp   = jiffies;
3085
3086         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3087 }
3088
3089 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3090 {
3091         struct inode *inode = data->inode;
3092
3093         if (!nfs4_sequence_done(task, &data->res.seq_res))
3094                 return -EAGAIN;
3095
3096         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3097                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3098                 return -EAGAIN;
3099         }
3100         nfs_refresh_inode(inode, data->res.fattr);
3101         return 0;
3102 }
3103
3104 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3105 {
3106         struct nfs_server *server = NFS_SERVER(data->inode);
3107
3108         data->args.bitmask = server->cache_consistency_bitmask;
3109         data->res.server = server;
3110         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3111 }
3112
3113 struct nfs4_renewdata {
3114         struct nfs_client       *client;
3115         unsigned long           timestamp;
3116 };
3117
3118 /*
3119  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3120  * standalone procedure for queueing an asynchronous RENEW.
3121  */
3122 static void nfs4_renew_release(void *calldata)
3123 {
3124         struct nfs4_renewdata *data = calldata;
3125         struct nfs_client *clp = data->client;
3126
3127         if (atomic_read(&clp->cl_count) > 1)
3128                 nfs4_schedule_state_renewal(clp);
3129         nfs_put_client(clp);
3130         kfree(data);
3131 }
3132
3133 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3134 {
3135         struct nfs4_renewdata *data = calldata;
3136         struct nfs_client *clp = data->client;
3137         unsigned long timestamp = data->timestamp;
3138
3139         if (task->tk_status < 0) {
3140                 /* Unless we're shutting down, schedule state recovery! */
3141                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3142                         nfs4_schedule_state_recovery(clp);
3143                 return;
3144         }
3145         do_renew_lease(clp, timestamp);
3146 }
3147
3148 static const struct rpc_call_ops nfs4_renew_ops = {
3149         .rpc_call_done = nfs4_renew_done,
3150         .rpc_release = nfs4_renew_release,
3151 };
3152
3153 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3154 {
3155         struct rpc_message msg = {
3156                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3157                 .rpc_argp       = clp,
3158                 .rpc_cred       = cred,
3159         };
3160         struct nfs4_renewdata *data;
3161
3162         if (!atomic_inc_not_zero(&clp->cl_count))
3163                 return -EIO;
3164         data = kmalloc(sizeof(*data), GFP_KERNEL);
3165         if (data == NULL)
3166                 return -ENOMEM;
3167         data->client = clp;
3168         data->timestamp = jiffies;
3169         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3170                         &nfs4_renew_ops, data);
3171 }
3172
3173 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3174 {
3175         struct rpc_message msg = {
3176                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3177                 .rpc_argp       = clp,
3178                 .rpc_cred       = cred,
3179         };
3180         unsigned long now = jiffies;
3181         int status;
3182
3183         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3184         if (status < 0)
3185                 return status;
3186         do_renew_lease(clp, now);
3187         return 0;
3188 }
3189
3190 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3191 {
3192         return (server->caps & NFS_CAP_ACLS)
3193                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3194                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3195 }
3196
3197 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3198  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3199  * the stack.
3200  */
3201 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3202
3203 static void buf_to_pages(const void *buf, size_t buflen,
3204                 struct page **pages, unsigned int *pgbase)
3205 {
3206         const void *p = buf;
3207
3208         *pgbase = offset_in_page(buf);
3209         p -= *pgbase;
3210         while (p < buf + buflen) {
3211                 *(pages++) = virt_to_page(p);
3212                 p += PAGE_CACHE_SIZE;
3213         }
3214 }
3215
3216 struct nfs4_cached_acl {
3217         int cached;
3218         size_t len;
3219         char data[0];
3220 };
3221
3222 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3223 {
3224         struct nfs_inode *nfsi = NFS_I(inode);
3225
3226         spin_lock(&inode->i_lock);
3227         kfree(nfsi->nfs4_acl);
3228         nfsi->nfs4_acl = acl;
3229         spin_unlock(&inode->i_lock);
3230 }
3231
3232 static void nfs4_zap_acl_attr(struct inode *inode)
3233 {
3234         nfs4_set_cached_acl(inode, NULL);
3235 }
3236
3237 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3238 {
3239         struct nfs_inode *nfsi = NFS_I(inode);
3240         struct nfs4_cached_acl *acl;
3241         int ret = -ENOENT;
3242
3243         spin_lock(&inode->i_lock);
3244         acl = nfsi->nfs4_acl;
3245         if (acl == NULL)
3246                 goto out;
3247         if (buf == NULL) /* user is just asking for length */
3248                 goto out_len;
3249         if (acl->cached == 0)
3250                 goto out;
3251         ret = -ERANGE; /* see getxattr(2) man page */
3252         if (acl->len > buflen)
3253                 goto out;
3254         memcpy(buf, acl->data, acl->len);
3255 out_len:
3256         ret = acl->len;
3257 out:
3258         spin_unlock(&inode->i_lock);
3259         return ret;
3260 }
3261
3262 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3263 {
3264         struct nfs4_cached_acl *acl;
3265
3266         if (buf && acl_len <= PAGE_SIZE) {
3267                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3268                 if (acl == NULL)
3269                         goto out;
3270                 acl->cached = 1;
3271                 memcpy(acl->data, buf, acl_len);
3272         } else {
3273                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3274                 if (acl == NULL)
3275                         goto out;
3276                 acl->cached = 0;
3277         }
3278         acl->len = acl_len;
3279 out:
3280         nfs4_set_cached_acl(inode, acl);
3281 }
3282
3283 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3284 {
3285         struct page *pages[NFS4ACL_MAXPAGES];
3286         struct nfs_getaclargs args = {
3287                 .fh = NFS_FH(inode),
3288                 .acl_pages = pages,
3289                 .acl_len = buflen,
3290         };
3291         struct nfs_getaclres res = {
3292                 .acl_len = buflen,
3293         };
3294         void *resp_buf;
3295         struct rpc_message msg = {
3296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3297                 .rpc_argp = &args,
3298                 .rpc_resp = &res,
3299         };
3300         struct page *localpage = NULL;
3301         int ret;
3302
3303         if (buflen < PAGE_SIZE) {
3304                 /* As long as we're doing a round trip to the server anyway,
3305                  * let's be prepared for a page of acl data. */
3306                 localpage = alloc_page(GFP_KERNEL);
3307                 resp_buf = page_address(localpage);
3308                 if (localpage == NULL)
3309                         return -ENOMEM;
3310                 args.acl_pages[0] = localpage;
3311                 args.acl_pgbase = 0;
3312                 args.acl_len = PAGE_SIZE;
3313         } else {
3314                 resp_buf = buf;
3315                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3316         }
3317         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3318         if (ret)
3319                 goto out_free;
3320         if (res.acl_len > args.acl_len)
3321                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3322         else
3323                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3324         if (buf) {
3325                 ret = -ERANGE;
3326                 if (res.acl_len > buflen)
3327                         goto out_free;
3328                 if (localpage)
3329                         memcpy(buf, resp_buf, res.acl_len);
3330         }
3331         ret = res.acl_len;
3332 out_free:
3333         if (localpage)
3334                 __free_page(localpage);
3335         return ret;
3336 }
3337
3338 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3339 {
3340         struct nfs4_exception exception = { };
3341         ssize_t ret;
3342         do {
3343                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3344                 if (ret >= 0)
3345                         break;
3346                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3347         } while (exception.retry);
3348         return ret;
3349 }
3350
3351 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3352 {
3353         struct nfs_server *server = NFS_SERVER(inode);
3354         int ret;
3355
3356         if (!nfs4_server_supports_acls(server))
3357                 return -EOPNOTSUPP;
3358         ret = nfs_revalidate_inode(server, inode);
3359         if (ret < 0)
3360                 return ret;
3361         ret = nfs4_read_cached_acl(inode, buf, buflen);
3362         if (ret != -ENOENT)
3363                 return ret;
3364         return nfs4_get_acl_uncached(inode, buf, buflen);
3365 }
3366
3367 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3368 {
3369         struct nfs_server *server = NFS_SERVER(inode);
3370         struct page *pages[NFS4ACL_MAXPAGES];
3371         struct nfs_setaclargs arg = {
3372                 .fh             = NFS_FH(inode),
3373                 .acl_pages      = pages,
3374                 .acl_len        = buflen,
3375         };
3376         struct nfs_setaclres res;
3377         struct rpc_message msg = {
3378                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3379                 .rpc_argp       = &arg,
3380                 .rpc_resp       = &res,
3381         };
3382         int ret;
3383
3384         if (!nfs4_server_supports_acls(server))
3385                 return -EOPNOTSUPP;
3386         nfs_inode_return_delegation(inode);
3387         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3388         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3389         nfs_access_zap_cache(inode);
3390         nfs_zap_acl_cache(inode);
3391         return ret;
3392 }
3393
3394 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3395 {
3396         struct nfs4_exception exception = { };
3397         int err;
3398         do {
3399                 err = nfs4_handle_exception(NFS_SERVER(inode),
3400                                 __nfs4_proc_set_acl(inode, buf, buflen),
3401                                 &exception);
3402         } while (exception.retry);
3403         return err;
3404 }
3405
3406 static int
3407 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3408 {
3409         struct nfs_client *clp = server->nfs_client;
3410
3411         if (task->tk_status >= 0)
3412                 return 0;
3413         switch(task->tk_status) {
3414                 case -NFS4ERR_ADMIN_REVOKED:
3415                 case -NFS4ERR_BAD_STATEID:
3416                 case -NFS4ERR_OPENMODE:
3417                         if (state == NULL)
3418                                 break;
3419                         nfs4_state_mark_reclaim_nograce(clp, state);
3420                         goto do_state_recovery;
3421                 case -NFS4ERR_STALE_STATEID:
3422                 case -NFS4ERR_STALE_CLIENTID:
3423                 case -NFS4ERR_EXPIRED:
3424                         goto do_state_recovery;
3425 #if defined(CONFIG_NFS_V4_1)
3426                 case -NFS4ERR_BADSESSION:
3427                 case -NFS4ERR_BADSLOT:
3428                 case -NFS4ERR_BAD_HIGH_SLOT:
3429                 case -NFS4ERR_DEADSESSION:
3430                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3431                 case -NFS4ERR_SEQ_FALSE_RETRY:
3432                 case -NFS4ERR_SEQ_MISORDERED:
3433                         dprintk("%s ERROR %d, Reset session\n", __func__,
3434                                 task->tk_status);
3435                         nfs4_schedule_state_recovery(clp);
3436                         task->tk_status = 0;
3437                         return -EAGAIN;
3438 #endif /* CONFIG_NFS_V4_1 */
3439                 case -NFS4ERR_DELAY:
3440                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3441                 case -NFS4ERR_GRACE:
3442                 case -EKEYEXPIRED:
3443                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3444                         task->tk_status = 0;
3445                         return -EAGAIN;
3446                 case -NFS4ERR_OLD_STATEID:
3447                         task->tk_status = 0;
3448                         return -EAGAIN;
3449         }
3450         task->tk_status = nfs4_map_errors(task->tk_status);
3451         return 0;
3452 do_state_recovery:
3453         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3454         nfs4_schedule_state_recovery(clp);
3455         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3456                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3457         task->tk_status = 0;
3458         return -EAGAIN;
3459 }
3460
3461 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3462                 unsigned short port, struct rpc_cred *cred,
3463                 struct nfs4_setclientid_res *res)
3464 {
3465         nfs4_verifier sc_verifier;
3466         struct nfs4_setclientid setclientid = {
3467                 .sc_verifier = &sc_verifier,
3468                 .sc_prog = program,
3469         };
3470         struct rpc_message msg = {
3471                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3472                 .rpc_argp = &setclientid,
3473                 .rpc_resp = res,
3474                 .rpc_cred = cred,
3475         };
3476         __be32 *p;
3477         int loop = 0;
3478         int status;
3479
3480         p = (__be32*)sc_verifier.data;
3481         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3482         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3483
3484         for(;;) {
3485                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3486                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3487                                 clp->cl_ipaddr,
3488                                 rpc_peeraddr2str(clp->cl_rpcclient,
3489                                                         RPC_DISPLAY_ADDR),
3490                                 rpc_peeraddr2str(clp->cl_rpcclient,
3491                                                         RPC_DISPLAY_PROTO),
3492                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3493                                 clp->cl_id_uniquifier);
3494                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3495                                 sizeof(setclientid.sc_netid),
3496                                 rpc_peeraddr2str(clp->cl_rpcclient,
3497                                                         RPC_DISPLAY_NETID));
3498                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3499                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3500                                 clp->cl_ipaddr, port >> 8, port & 255);
3501
3502                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3503                 if (status != -NFS4ERR_CLID_INUSE)
3504                         break;
3505                 if (signalled())
3506                         break;
3507                 if (loop++ & 1)
3508                         ssleep(clp->cl_lease_time + 1);
3509                 else
3510                         if (++clp->cl_id_uniquifier == 0)
3511                                 break;
3512         }
3513         return status;
3514 }
3515
3516 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3517                 struct nfs4_setclientid_res *arg,
3518                 struct rpc_cred *cred)
3519 {
3520         struct nfs_fsinfo fsinfo;
3521         struct rpc_message msg = {
3522                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3523                 .rpc_argp = arg,
3524                 .rpc_resp = &fsinfo,
3525                 .rpc_cred = cred,
3526         };
3527         unsigned long now;
3528         int status;
3529
3530         now = jiffies;
3531         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3532         if (status == 0) {
3533                 spin_lock(&clp->cl_lock);
3534                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3535                 clp->cl_last_renewal = now;
3536                 spin_unlock(&clp->cl_lock);
3537         }
3538         return status;
3539 }
3540
3541 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3542                 struct nfs4_setclientid_res *arg,
3543                 struct rpc_cred *cred)
3544 {
3545         long timeout = 0;
3546         int err;
3547         do {
3548                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3549                 switch (err) {
3550                         case 0:
3551                                 return err;
3552                         case -NFS4ERR_RESOURCE:
3553                                 /* The IBM lawyers misread another document! */
3554                         case -NFS4ERR_DELAY:
3555                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3556                 }
3557         } while (err == 0);
3558         return err;
3559 }
3560
3561 struct nfs4_delegreturndata {
3562         struct nfs4_delegreturnargs args;
3563         struct nfs4_delegreturnres res;
3564         struct nfs_fh fh;
3565         nfs4_stateid stateid;
3566         unsigned long timestamp;
3567         struct nfs_fattr fattr;
3568         int rpc_status;
3569 };
3570
3571 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3572 {
3573         struct nfs4_delegreturndata *data = calldata;
3574
3575         if (!nfs4_sequence_done(task, &data->res.seq_res))
3576                 return;
3577
3578         switch (task->tk_status) {
3579         case -NFS4ERR_STALE_STATEID:
3580         case -NFS4ERR_EXPIRED:
3581         case 0:
3582                 renew_lease(data->res.server, data->timestamp);
3583                 break;
3584         default:
3585                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3586                                 -EAGAIN) {
3587                         nfs_restart_rpc(task, data->res.server->nfs_client);
3588                         return;
3589                 }
3590         }
3591         data->rpc_status = task->tk_status;
3592 }
3593
3594 static void nfs4_delegreturn_release(void *calldata)
3595 {
3596         kfree(calldata);
3597 }
3598
3599 #if defined(CONFIG_NFS_V4_1)
3600 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3601 {
3602         struct nfs4_delegreturndata *d_data;
3603
3604         d_data = (struct nfs4_delegreturndata *)data;
3605
3606         if (nfs4_setup_sequence(d_data->res.server,
3607                                 &d_data->args.seq_args,
3608                                 &d_data->res.seq_res, 1, task))
3609                 return;
3610         rpc_call_start(task);
3611 }
3612 #endif /* CONFIG_NFS_V4_1 */
3613
3614 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3615 #if defined(CONFIG_NFS_V4_1)
3616         .rpc_call_prepare = nfs4_delegreturn_prepare,
3617 #endif /* CONFIG_NFS_V4_1 */
3618         .rpc_call_done = nfs4_delegreturn_done,
3619         .rpc_release = nfs4_delegreturn_release,
3620 };
3621
3622 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3623 {
3624         struct nfs4_delegreturndata *data;
3625         struct nfs_server *server = NFS_SERVER(inode);
3626         struct rpc_task *task;
3627         struct rpc_message msg = {
3628                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3629                 .rpc_cred = cred,
3630         };
3631         struct rpc_task_setup task_setup_data = {
3632                 .rpc_client = server->client,
3633                 .rpc_message = &msg,
3634                 .callback_ops = &nfs4_delegreturn_ops,
3635                 .flags = RPC_TASK_ASYNC,
3636         };
3637         int status = 0;
3638
3639         data = kzalloc(sizeof(*data), GFP_NOFS);
3640         if (data == NULL)
3641                 return -ENOMEM;
3642         data->args.fhandle = &data->fh;
3643         data->args.stateid = &data->stateid;
3644         data->args.bitmask = server->attr_bitmask;
3645         nfs_copy_fh(&data->fh, NFS_FH(inode));
3646         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3647         data->res.fattr = &data->fattr;
3648         data->res.server = server;
3649         nfs_fattr_init(data->res.fattr);
3650         data->timestamp = jiffies;
3651         data->rpc_status = 0;
3652
3653         task_setup_data.callback_data = data;
3654         msg.rpc_argp = &data->args,
3655         msg.rpc_resp = &data->res,
3656         task = rpc_run_task(&task_setup_data);
3657         if (IS_ERR(task))
3658                 return PTR_ERR(task);
3659         if (!issync)
3660                 goto out;
3661         status = nfs4_wait_for_completion_rpc_task(task);
3662         if (status != 0)
3663                 goto out;
3664         status = data->rpc_status;
3665         if (status != 0)
3666                 goto out;
3667         nfs_refresh_inode(inode, &data->fattr);
3668 out:
3669         rpc_put_task(task);
3670         return status;
3671 }
3672
3673 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3674 {
3675         struct nfs_server *server = NFS_SERVER(inode);
3676         struct nfs4_exception exception = { };
3677         int err;
3678         do {
3679                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3680                 switch (err) {
3681                         case -NFS4ERR_STALE_STATEID:
3682                         case -NFS4ERR_EXPIRED:
3683                         case 0:
3684                                 return 0;
3685                 }
3686                 err = nfs4_handle_exception(server, err, &exception);
3687         } while (exception.retry);
3688         return err;
3689 }
3690
3691 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3692 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3693
3694 /*
3695  * sleep, with exponential backoff, and retry the LOCK operation.
3696  */
3697 static unsigned long
3698 nfs4_set_lock_task_retry(unsigned long timeout)
3699 {
3700         schedule_timeout_killable(timeout);
3701         timeout <<= 1;
3702         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3703                 return NFS4_LOCK_MAXTIMEOUT;
3704         return timeout;
3705 }
3706
3707 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3708 {
3709         struct inode *inode = state->inode;
3710         struct nfs_server *server = NFS_SERVER(inode);
3711         struct nfs_client *clp = server->nfs_client;
3712         struct nfs_lockt_args arg = {
3713                 .fh = NFS_FH(inode),
3714                 .fl = request,
3715         };
3716         struct nfs_lockt_res res = {
3717                 .denied = request,
3718         };
3719         struct rpc_message msg = {
3720                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3721                 .rpc_argp       = &arg,
3722                 .rpc_resp       = &res,
3723                 .rpc_cred       = state->owner->so_cred,
3724         };
3725         struct nfs4_lock_state *lsp;
3726         int status;
3727
3728         arg.lock_owner.clientid = clp->cl_clientid;
3729         status = nfs4_set_lock_state(state, request);
3730         if (status != 0)
3731                 goto out;
3732         lsp = request->fl_u.nfs4_fl.owner;
3733         arg.lock_owner.id = lsp->ls_id.id;
3734         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3735         switch (status) {
3736                 case 0:
3737                         request->fl_type = F_UNLCK;
3738                         break;
3739                 case -NFS4ERR_DENIED:
3740                         status = 0;
3741         }
3742         request->fl_ops->fl_release_private(request);
3743 out:
3744         return status;
3745 }
3746
3747 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3748 {
3749         struct nfs4_exception exception = { };
3750         int err;
3751
3752         do {
3753                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3754                                 _nfs4_proc_getlk(state, cmd, request),
3755                                 &exception);
3756         } while (exception.retry);
3757         return err;
3758 }
3759
3760 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3761 {
3762         int res = 0;
3763         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3764                 case FL_POSIX:
3765                         res = posix_lock_file_wait(file, fl);
3766                         break;
3767                 case FL_FLOCK:
3768                         res = flock_lock_file_wait(file, fl);
3769                         break;
3770                 default:
3771                         BUG();
3772         }
3773         return res;
3774 }
3775
3776 struct nfs4_unlockdata {
3777         struct nfs_locku_args arg;
3778         struct nfs_locku_res res;
3779         struct nfs4_lock_state *lsp;
3780         struct nfs_open_context *ctx;
3781         struct file_lock fl;
3782         const struct nfs_server *server;
3783         unsigned long timestamp;
3784 };
3785
3786 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3787                 struct nfs_open_context *ctx,
3788                 struct nfs4_lock_state *lsp,
3789                 struct nfs_seqid *seqid)
3790 {
3791         struct nfs4_unlockdata *p;
3792         struct inode *inode = lsp->ls_state->inode;
3793
3794         p = kzalloc(sizeof(*p), GFP_NOFS);
3795         if (p == NULL)
3796                 return NULL;
3797         p->arg.fh = NFS_FH(inode);
3798         p->arg.fl = &p->fl;
3799         p->arg.seqid = seqid;
3800         p->res.seqid = seqid;
3801         p->arg.stateid = &lsp->ls_stateid;
3802         p->lsp = lsp;
3803         atomic_inc(&lsp->ls_count);
3804         /* Ensure we don't close file until we're done freeing locks! */
3805         p->ctx = get_nfs_open_context(ctx);
3806         memcpy(&p->fl, fl, sizeof(p->fl));
3807         p->server = NFS_SERVER(inode);
3808         return p;
3809 }
3810
3811 static void nfs4_locku_release_calldata(void *data)
3812 {
3813         struct nfs4_unlockdata *calldata = data;
3814         nfs_free_seqid(calldata->arg.seqid);
3815         nfs4_put_lock_state(calldata->lsp);
3816         put_nfs_open_context(calldata->ctx);
3817         kfree(calldata);
3818 }
3819
3820 static void nfs4_locku_done(struct rpc_task *task, void *data)
3821 {
3822         struct nfs4_unlockdata *calldata = data;
3823
3824         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3825                 return;
3826         switch (task->tk_status) {
3827                 case 0:
3828                         memcpy(calldata->lsp->ls_stateid.data,
3829                                         calldata->res.stateid.data,
3830                                         sizeof(calldata->lsp->ls_stateid.data));
3831                         renew_lease(calldata->server, calldata->timestamp);
3832                         break;
3833                 case -NFS4ERR_BAD_STATEID:
3834                 case -NFS4ERR_OLD_STATEID:
3835                 case -NFS4ERR_STALE_STATEID:
3836                 case -NFS4ERR_EXPIRED:
3837                         break;
3838                 default:
3839                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3840                                 nfs_restart_rpc(task,
3841                                                  calldata->server->nfs_client);
3842         }
3843 }
3844
3845 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3846 {
3847         struct nfs4_unlockdata *calldata = data;
3848
3849         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3850                 return;
3851         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3852                 /* Note: exit _without_ running nfs4_locku_done */
3853                 task->tk_action = NULL;
3854                 return;
3855         }
3856         calldata->timestamp = jiffies;
3857         if (nfs4_setup_sequence(calldata->server,
3858                                 &calldata->arg.seq_args,
3859                                 &calldata->res.seq_res, 1, task))
3860                 return;
3861         rpc_call_start(task);
3862 }
3863
3864 static const struct rpc_call_ops nfs4_locku_ops = {
3865         .rpc_call_prepare = nfs4_locku_prepare,
3866         .rpc_call_done = nfs4_locku_done,
3867         .rpc_release = nfs4_locku_release_calldata,
3868 };
3869
3870 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3871                 struct nfs_open_context *ctx,
3872                 struct nfs4_lock_state *lsp,
3873                 struct nfs_seqid *seqid)
3874 {
3875         struct nfs4_unlockdata *data;
3876         struct rpc_message msg = {
3877                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3878                 .rpc_cred = ctx->cred,
3879         };
3880         struct rpc_task_setup task_setup_data = {
3881                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3882                 .rpc_message = &msg,
3883                 .callback_ops = &nfs4_locku_ops,
3884                 .workqueue = nfsiod_workqueue,
3885                 .flags = RPC_TASK_ASYNC,
3886         };
3887
3888         /* Ensure this is an unlock - when canceling a lock, the
3889          * canceled lock is passed in, and it won't be an unlock.
3890          */
3891         fl->fl_type = F_UNLCK;
3892
3893         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3894         if (data == NULL) {
3895                 nfs_free_seqid(seqid);
3896                 return ERR_PTR(-ENOMEM);
3897         }
3898
3899         msg.rpc_argp = &data->arg,
3900         msg.rpc_resp = &data->res,
3901         task_setup_data.callback_data = data;
3902         return rpc_run_task(&task_setup_data);
3903 }
3904
3905 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3906 {
3907         struct nfs_inode *nfsi = NFS_I(state->inode);
3908         struct nfs_seqid *seqid;
3909         struct nfs4_lock_state *lsp;
3910         struct rpc_task *task;
3911         int status = 0;
3912         unsigned char fl_flags = request->fl_flags;
3913
3914         status = nfs4_set_lock_state(state, request);
3915         /* Unlock _before_ we do the RPC call */
3916         request->fl_flags |= FL_EXISTS;
3917         down_read(&nfsi->rwsem);
3918         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3919                 up_read(&nfsi->rwsem);
3920                 goto out;
3921         }
3922         up_read(&nfsi->rwsem);
3923         if (status != 0)
3924                 goto out;
3925         /* Is this a delegated lock? */
3926         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3927                 goto out;
3928         lsp = request->fl_u.nfs4_fl.owner;
3929         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3930         status = -ENOMEM;
3931         if (seqid == NULL)
3932                 goto out;
3933         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3934         status = PTR_ERR(task);
3935         if (IS_ERR(task))
3936                 goto out;
3937         status = nfs4_wait_for_completion_rpc_task(task);
3938         rpc_put_task(task);
3939 out:
3940         request->fl_flags = fl_flags;
3941         return status;
3942 }
3943
3944 struct nfs4_lockdata {
3945         struct nfs_lock_args arg;
3946         struct nfs_lock_res res;
3947         struct nfs4_lock_state *lsp;
3948         struct nfs_open_context *ctx;
3949         struct file_lock fl;
3950         unsigned long timestamp;
3951         int rpc_status;
3952         int cancelled;
3953         struct nfs_server *server;
3954 };
3955
3956 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3957                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3958                 gfp_t gfp_mask)
3959 {
3960         struct nfs4_lockdata *p;
3961         struct inode *inode = lsp->ls_state->inode;
3962         struct nfs_server *server = NFS_SERVER(inode);
3963
3964         p = kzalloc(sizeof(*p), gfp_mask);
3965         if (p == NULL)
3966                 return NULL;
3967
3968         p->arg.fh = NFS_FH(inode);
3969         p->arg.fl = &p->fl;
3970         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
3971         if (p->arg.open_seqid == NULL)
3972                 goto out_free;
3973         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
3974         if (p->arg.lock_seqid == NULL)
3975                 goto out_free_seqid;
3976         p->arg.lock_stateid = &lsp->ls_stateid;
3977         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3978         p->arg.lock_owner.id = lsp->ls_id.id;
3979         p->res.lock_seqid = p->arg.lock_seqid;
3980         p->lsp = lsp;
3981         p->server = server;
3982         atomic_inc(&lsp->ls_count);
3983         p->ctx = get_nfs_open_context(ctx);
3984         memcpy(&p->fl, fl, sizeof(p->fl));
3985         return p;
3986 out_free_seqid:
3987         nfs_free_seqid(p->arg.open_seqid);
3988 out_free:
3989         kfree(p);
3990         return NULL;
3991 }
3992
3993 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3994 {
3995         struct nfs4_lockdata *data = calldata;
3996         struct nfs4_state *state = data->lsp->ls_state;
3997
3998         dprintk("%s: begin!\n", __func__);
3999         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4000                 return;
4001         /* Do we need to do an open_to_lock_owner? */
4002         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4003                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4004                         return;
4005                 data->arg.open_stateid = &state->stateid;
4006                 data->arg.new_lock_owner = 1;
4007                 data->res.open_seqid = data->arg.open_seqid;
4008         } else
4009                 data->arg.new_lock_owner = 0;
4010         data->timestamp = jiffies;
4011         if (nfs4_setup_sequence(data->server,
4012                                 &data->arg.seq_args,
4013                                 &data->res.seq_res, 1, task))
4014                 return;
4015         rpc_call_start(task);
4016         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4017 }
4018
4019 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4020 {
4021         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4022         nfs4_lock_prepare(task, calldata);
4023 }
4024
4025 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4026 {
4027         struct nfs4_lockdata *data = calldata;
4028
4029         dprintk("%s: begin!\n", __func__);
4030
4031         if (!nfs4_sequence_done(task, &data->res.seq_res))
4032                 return;
4033
4034         data->rpc_status = task->tk_status;
4035         if (data->arg.new_lock_owner != 0) {
4036                 if (data->rpc_status == 0)
4037                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4038                 else
4039                         goto out;
4040         }
4041         if (data->rpc_status == 0) {
4042                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4043                                         sizeof(data->lsp->ls_stateid.data));
4044                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4045                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4046         }
4047 out:
4048         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4049 }
4050
4051 static void nfs4_lock_release(void *calldata)
4052 {
4053         struct nfs4_lockdata *data = calldata;
4054
4055         dprintk("%s: begin!\n", __func__);
4056         nfs_free_seqid(data->arg.open_seqid);
4057         if (data->cancelled != 0) {
4058                 struct rpc_task *task;
4059                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4060                                 data->arg.lock_seqid);
4061                 if (!IS_ERR(task))
4062                         rpc_put_task(task);
4063                 dprintk("%s: cancelling lock!\n", __func__);
4064         } else
4065                 nfs_free_seqid(data->arg.lock_seqid);
4066         nfs4_put_lock_state(data->lsp);
4067         put_nfs_open_context(data->ctx);
4068         kfree(data);
4069         dprintk("%s: done!\n", __func__);
4070 }
4071
4072 static const struct rpc_call_ops nfs4_lock_ops = {
4073         .rpc_call_prepare = nfs4_lock_prepare,
4074         .rpc_call_done = nfs4_lock_done,
4075         .rpc_release = nfs4_lock_release,
4076 };
4077
4078 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4079         .rpc_call_prepare = nfs4_recover_lock_prepare,
4080         .rpc_call_done = nfs4_lock_done,
4081         .rpc_release = nfs4_lock_release,
4082 };
4083
4084 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4085 {
4086         struct nfs_client *clp = server->nfs_client;
4087         struct nfs4_state *state = lsp->ls_state;
4088
4089         switch (error) {
4090         case -NFS4ERR_ADMIN_REVOKED:
4091         case -NFS4ERR_BAD_STATEID:
4092         case -NFS4ERR_EXPIRED:
4093                 if (new_lock_owner != 0 ||
4094                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4095                         nfs4_state_mark_reclaim_nograce(clp, state);
4096                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4097                 break;
4098         case -NFS4ERR_STALE_STATEID:
4099                 if (new_lock_owner != 0 ||
4100                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4101                         nfs4_state_mark_reclaim_reboot(clp, state);
4102                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4103         };
4104 }
4105
4106 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4107 {
4108         struct nfs4_lockdata *data;
4109         struct rpc_task *task;
4110         struct rpc_message msg = {
4111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4112                 .rpc_cred = state->owner->so_cred,
4113         };
4114         struct rpc_task_setup task_setup_data = {
4115                 .rpc_client = NFS_CLIENT(state->inode),
4116                 .rpc_message = &msg,
4117                 .callback_ops = &nfs4_lock_ops,
4118                 .workqueue = nfsiod_workqueue,
4119                 .flags = RPC_TASK_ASYNC,
4120         };
4121         int ret;
4122
4123         dprintk("%s: begin!\n", __func__);
4124         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4125                         fl->fl_u.nfs4_fl.owner,
4126                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4127         if (data == NULL)
4128                 return -ENOMEM;
4129         if (IS_SETLKW(cmd))
4130                 data->arg.block = 1;
4131         if (recovery_type > NFS_LOCK_NEW) {
4132                 if (recovery_type == NFS_LOCK_RECLAIM)
4133                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4134                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4135         }
4136         msg.rpc_argp = &data->arg,
4137         msg.rpc_resp = &data->res,
4138         task_setup_data.callback_data = data;
4139         task = rpc_run_task(&task_setup_data);
4140         if (IS_ERR(task))
4141                 return PTR_ERR(task);
4142         ret = nfs4_wait_for_completion_rpc_task(task);
4143         if (ret == 0) {
4144                 ret = data->rpc_status;
4145                 if (ret)
4146                         nfs4_handle_setlk_error(data->server, data->lsp,
4147                                         data->arg.new_lock_owner, ret);
4148         } else
4149                 data->cancelled = 1;
4150         rpc_put_task(task);
4151         dprintk("%s: done, ret = %d!\n", __func__, ret);
4152         return ret;
4153 }
4154
4155 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4156 {
4157         struct nfs_server *server = NFS_SERVER(state->inode);
4158         struct nfs4_exception exception = { };
4159         int err;
4160
4161         do {
4162                 /* Cache the lock if possible... */
4163                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4164                         return 0;
4165                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4166                 if (err != -NFS4ERR_DELAY)
4167                         break;
4168                 nfs4_handle_exception(server, err, &exception);
4169         } while (exception.retry);
4170         return err;
4171 }
4172
4173 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4174 {
4175         struct nfs_server *server = NFS_SERVER(state->inode);
4176         struct nfs4_exception exception = { };
4177         int err;
4178
4179         err = nfs4_set_lock_state(state, request);
4180         if (err != 0)
4181                 return err;
4182         do {
4183                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4184                         return 0;
4185                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4186                 switch (err) {
4187                 default:
4188                         goto out;
4189                 case -NFS4ERR_GRACE:
4190                 case -NFS4ERR_DELAY:
4191                         nfs4_handle_exception(server, err, &exception);
4192                         err = 0;
4193                 }
4194         } while (exception.retry);
4195 out:
4196         return err;
4197 }
4198
4199 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4200 {
4201         struct nfs_inode *nfsi = NFS_I(state->inode);
4202         unsigned char fl_flags = request->fl_flags;
4203         int status = -ENOLCK;
4204
4205         if ((fl_flags & FL_POSIX) &&
4206                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4207                 goto out;
4208         /* Is this a delegated open? */
4209         status = nfs4_set_lock_state(state, request);
4210         if (status != 0)
4211                 goto out;
4212         request->fl_flags |= FL_ACCESS;
4213         status = do_vfs_lock(request->fl_file, request);
4214         if (status < 0)
4215                 goto out;
4216         down_read(&nfsi->rwsem);
4217         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4218                 /* Yes: cache locks! */
4219                 /* ...but avoid races with delegation recall... */
4220                 request->fl_flags = fl_flags & ~FL_SLEEP;
4221                 status = do_vfs_lock(request->fl_file, request);
4222                 goto out_unlock;
4223         }
4224         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4225         if (status != 0)
4226                 goto out_unlock;
4227         /* Note: we always want to sleep here! */
4228         request->fl_flags = fl_flags | FL_SLEEP;
4229         if (do_vfs_lock(request->fl_file, request) < 0)
4230                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4231 out_unlock:
4232         up_read(&nfsi->rwsem);
4233 out:
4234         request->fl_flags = fl_flags;
4235         return status;
4236 }
4237
4238 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4239 {
4240         struct nfs4_exception exception = { };
4241         int err;
4242
4243         do {
4244                 err = _nfs4_proc_setlk(state, cmd, request);
4245                 if (err == -NFS4ERR_DENIED)
4246                         err = -EAGAIN;
4247                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4248                                 err, &exception);
4249         } while (exception.retry);
4250         return err;
4251 }
4252
4253 static int
4254 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4255 {
4256         struct nfs_open_context *ctx;
4257         struct nfs4_state *state;
4258         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4259         int status;
4260
4261         /* verify open state */
4262         ctx = nfs_file_open_context(filp);
4263         state = ctx->state;
4264
4265         if (request->fl_start < 0 || request->fl_end < 0)
4266                 return -EINVAL;
4267
4268         if (IS_GETLK(cmd)) {
4269                 if (state != NULL)
4270                         return nfs4_proc_getlk(state, F_GETLK, request);
4271                 return 0;
4272         }
4273
4274         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4275                 return -EINVAL;
4276
4277         if (request->fl_type == F_UNLCK) {
4278                 if (state != NULL)
4279                         return nfs4_proc_unlck(state, cmd, request);
4280                 return 0;
4281         }
4282
4283         if (state == NULL)
4284                 return -ENOLCK;
4285         do {
4286                 status = nfs4_proc_setlk(state, cmd, request);
4287                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4288                         break;
4289                 timeout = nfs4_set_lock_task_retry(timeout);
4290                 status = -ERESTARTSYS;
4291                 if (signalled())
4292                         break;
4293         } while(status < 0);
4294         return status;
4295 }
4296
4297 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4298 {
4299         struct nfs_server *server = NFS_SERVER(state->inode);
4300         struct nfs4_exception exception = { };
4301         int err;
4302
4303         err = nfs4_set_lock_state(state, fl);
4304         if (err != 0)
4305                 goto out;
4306         do {
4307                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4308                 switch (err) {
4309                         default:
4310                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4311                                                 __func__, err);
4312                         case 0:
4313                         case -ESTALE:
4314                                 goto out;
4315                         case -NFS4ERR_EXPIRED:
4316                         case -NFS4ERR_STALE_CLIENTID:
4317                         case -NFS4ERR_STALE_STATEID:
4318                         case -NFS4ERR_BADSESSION:
4319                         case -NFS4ERR_BADSLOT:
4320                         case -NFS4ERR_BAD_HIGH_SLOT:
4321                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4322                         case -NFS4ERR_DEADSESSION:
4323                                 nfs4_schedule_state_recovery(server->nfs_client);
4324                                 goto out;
4325                         case -ERESTARTSYS:
4326                                 /*
4327                                  * The show must go on: exit, but mark the
4328                                  * stateid as needing recovery.
4329                                  */
4330                         case -NFS4ERR_ADMIN_REVOKED:
4331                         case -NFS4ERR_BAD_STATEID:
4332                         case -NFS4ERR_OPENMODE:
4333                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4334                                 err = 0;
4335                                 goto out;
4336                         case -EKEYEXPIRED:
4337                                 /*
4338                                  * User RPCSEC_GSS context has expired.
4339                                  * We cannot recover this stateid now, so
4340                                  * skip it and allow recovery thread to
4341                                  * proceed.
4342                                  */
4343                                 err = 0;
4344                                 goto out;
4345                         case -ENOMEM:
4346                         case -NFS4ERR_DENIED:
4347                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4348                                 err = 0;
4349                                 goto out;
4350                         case -NFS4ERR_DELAY:
4351                                 break;
4352                 }
4353                 err = nfs4_handle_exception(server, err, &exception);
4354         } while (exception.retry);
4355 out:
4356         return err;
4357 }
4358
4359 static void nfs4_release_lockowner_release(void *calldata)
4360 {
4361         kfree(calldata);
4362 }
4363
4364 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4365         .rpc_release = nfs4_release_lockowner_release,
4366 };
4367
4368 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4369 {
4370         struct nfs_server *server = lsp->ls_state->owner->so_server;
4371         struct nfs_release_lockowner_args *args;
4372         struct rpc_message msg = {
4373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4374         };
4375
4376         if (server->nfs_client->cl_mvops->minor_version != 0)
4377                 return;
4378         args = kmalloc(sizeof(*args), GFP_NOFS);
4379         if (!args)
4380                 return;
4381         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4382         args->lock_owner.id = lsp->ls_id.id;
4383         msg.rpc_argp = args;
4384         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4385 }
4386
4387 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4388
4389 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4390                 size_t buflen, int flags)
4391 {
4392         struct inode *inode = dentry->d_inode;
4393
4394         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4395                 return -EOPNOTSUPP;
4396
4397         return nfs4_proc_set_acl(inode, buf, buflen);
4398 }
4399
4400 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4401  * and that's what we'll do for e.g. user attributes that haven't been set.
4402  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4403  * attributes in kernel-managed attribute namespaces. */
4404 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4405                 size_t buflen)
4406 {
4407         struct inode *inode = dentry->d_inode;
4408
4409         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4410                 return -EOPNOTSUPP;
4411
4412         return nfs4_proc_get_acl(inode, buf, buflen);
4413 }
4414
4415 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4416 {
4417         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4418
4419         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4420                 return 0;
4421         if (buf && buflen < len)
4422                 return -ERANGE;
4423         if (buf)
4424                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4425         return len;
4426 }
4427
4428 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4429 {
4430         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4431                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4432                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4433                 return;
4434
4435         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4436                 NFS_ATTR_FATTR_NLINK;
4437         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4438         fattr->nlink = 2;
4439 }
4440
4441 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4442                 struct nfs4_fs_locations *fs_locations, struct page *page)
4443 {
4444         struct nfs_server *server = NFS_SERVER(dir);
4445         u32 bitmask[2] = {
4446                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4447                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4448         };
4449         struct nfs4_fs_locations_arg args = {
4450                 .dir_fh = NFS_FH(dir),
4451                 .name = name,
4452                 .page = page,
4453                 .bitmask = bitmask,
4454         };
4455         struct nfs4_fs_locations_res res = {
4456                 .fs_locations = fs_locations,
4457         };
4458         struct rpc_message msg = {
4459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4460                 .rpc_argp = &args,
4461                 .rpc_resp = &res,
4462         };
4463         int status;
4464
4465         dprintk("%s: start\n", __func__);
4466         nfs_fattr_init(&fs_locations->fattr);
4467         fs_locations->server = server;
4468         fs_locations->nlocations = 0;
4469         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4470         nfs_fixup_referral_attributes(&fs_locations->fattr);
4471         dprintk("%s: returned status = %d\n", __func__, status);
4472         return status;
4473 }
4474
4475 #ifdef CONFIG_NFS_V4_1
4476 /*
4477  * nfs4_proc_exchange_id()
4478  *
4479  * Since the clientid has expired, all compounds using sessions
4480  * associated with the stale clientid will be returning
4481  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4482  * be in some phase of session reset.
4483  */
4484 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4485 {
4486         nfs4_verifier verifier;
4487         struct nfs41_exchange_id_args args = {
4488                 .client = clp,
4489                 .flags = clp->cl_exchange_flags,
4490         };
4491         struct nfs41_exchange_id_res res = {
4492                 .client = clp,
4493         };
4494         int status;
4495         struct rpc_message msg = {
4496                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4497                 .rpc_argp = &args,
4498                 .rpc_resp = &res,
4499                 .rpc_cred = cred,
4500         };
4501         __be32 *p;
4502
4503         dprintk("--> %s\n", __func__);
4504         BUG_ON(clp == NULL);
4505
4506         /* Remove server-only flags */
4507         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4508
4509         p = (u32 *)verifier.data;
4510         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4511         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4512         args.verifier = &verifier;
4513
4514         while (1) {
4515                 args.id_len = scnprintf(args.id, sizeof(args.id),
4516                                         "%s/%s %u",
4517                                         clp->cl_ipaddr,
4518                                         rpc_peeraddr2str(clp->cl_rpcclient,
4519                                                          RPC_DISPLAY_ADDR),
4520                                         clp->cl_id_uniquifier);
4521
4522                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4523
4524                 if (status != -NFS4ERR_CLID_INUSE)
4525                         break;
4526
4527                 if (signalled())
4528                         break;
4529
4530                 if (++clp->cl_id_uniquifier == 0)
4531                         break;
4532         }
4533
4534         dprintk("<-- %s status= %d\n", __func__, status);
4535         return status;
4536 }
4537
4538 struct nfs4_get_lease_time_data {
4539         struct nfs4_get_lease_time_args *args;
4540         struct nfs4_get_lease_time_res *res;
4541         struct nfs_client *clp;
4542 };
4543
4544 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4545                                         void *calldata)
4546 {
4547         int ret;
4548         struct nfs4_get_lease_time_data *data =
4549                         (struct nfs4_get_lease_time_data *)calldata;
4550
4551         dprintk("--> %s\n", __func__);
4552         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4553         /* just setup sequence, do not trigger session recovery
4554            since we're invoked within one */
4555         ret = nfs41_setup_sequence(data->clp->cl_session,
4556                                    &data->args->la_seq_args,
4557                                    &data->res->lr_seq_res, 0, task);
4558
4559         BUG_ON(ret == -EAGAIN);
4560         rpc_call_start(task);
4561         dprintk("<-- %s\n", __func__);
4562 }
4563
4564 /*
4565  * Called from nfs4_state_manager thread for session setup, so don't recover
4566  * from sequence operation or clientid errors.
4567  */
4568 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4569 {
4570         struct nfs4_get_lease_time_data *data =
4571                         (struct nfs4_get_lease_time_data *)calldata;
4572
4573         dprintk("--> %s\n", __func__);
4574         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4575                 return;
4576         switch (task->tk_status) {
4577         case -NFS4ERR_DELAY:
4578         case -NFS4ERR_GRACE:
4579                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4580                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4581                 task->tk_status = 0;
4582                 nfs_restart_rpc(task, data->clp);
4583                 return;
4584         }
4585         dprintk("<-- %s\n", __func__);
4586 }
4587
4588 struct rpc_call_ops nfs4_get_lease_time_ops = {
4589         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4590         .rpc_call_done = nfs4_get_lease_time_done,
4591 };
4592
4593 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4594 {
4595         struct rpc_task *task;
4596         struct nfs4_get_lease_time_args args;
4597         struct nfs4_get_lease_time_res res = {
4598                 .lr_fsinfo = fsinfo,
4599         };
4600         struct nfs4_get_lease_time_data data = {
4601                 .args = &args,
4602                 .res = &res,
4603                 .clp = clp,
4604         };
4605         struct rpc_message msg = {
4606                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4607                 .rpc_argp = &args,
4608                 .rpc_resp = &res,
4609         };
4610         struct rpc_task_setup task_setup = {
4611                 .rpc_client = clp->cl_rpcclient,
4612                 .rpc_message = &msg,
4613                 .callback_ops = &nfs4_get_lease_time_ops,
4614                 .callback_data = &data
4615         };
4616         int status;
4617
4618         dprintk("--> %s\n", __func__);
4619         task = rpc_run_task(&task_setup);
4620
4621         if (IS_ERR(task))
4622                 status = PTR_ERR(task);
4623         else {
4624                 status = task->tk_status;
4625                 rpc_put_task(task);
4626         }
4627         dprintk("<-- %s return %d\n", __func__, status);
4628
4629         return status;
4630 }
4631
4632 /*
4633  * Reset a slot table
4634  */
4635 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4636                                  int ivalue)
4637 {
4638         struct nfs4_slot *new = NULL;
4639         int i;
4640         int ret = 0;
4641
4642         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4643                 max_reqs, tbl->max_slots);
4644
4645         /* Does the newly negotiated max_reqs match the existing slot table? */
4646         if (max_reqs != tbl->max_slots) {
4647                 ret = -ENOMEM;
4648                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4649                               GFP_NOFS);
4650                 if (!new)
4651                         goto out;
4652                 ret = 0;
4653                 kfree(tbl->slots);
4654         }
4655         spin_lock(&tbl->slot_tbl_lock);
4656         if (new) {
4657                 tbl->slots = new;
4658                 tbl->max_slots = max_reqs;
4659         }
4660         for (i = 0; i < tbl->max_slots; ++i)
4661                 tbl->slots[i].seq_nr = ivalue;
4662         spin_unlock(&tbl->slot_tbl_lock);
4663         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4664                 tbl, tbl->slots, tbl->max_slots);
4665 out:
4666         dprintk("<-- %s: return %d\n", __func__, ret);
4667         return ret;
4668 }
4669
4670 /*
4671  * Reset the forechannel and backchannel slot tables
4672  */
4673 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4674 {
4675         int status;
4676
4677         status = nfs4_reset_slot_table(&session->fc_slot_table,
4678                         session->fc_attrs.max_reqs, 1);
4679         if (status)
4680                 return status;
4681
4682         status = nfs4_reset_slot_table(&session->bc_slot_table,
4683                         session->bc_attrs.max_reqs, 0);
4684         return status;
4685 }
4686
4687 /* Destroy the slot table */
4688 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4689 {
4690         if (session->fc_slot_table.slots != NULL) {
4691                 kfree(session->fc_slot_table.slots);
4692                 session->fc_slot_table.slots = NULL;
4693         }
4694         if (session->bc_slot_table.slots != NULL) {
4695                 kfree(session->bc_slot_table.slots);
4696                 session->bc_slot_table.slots = NULL;
4697         }
4698         return;
4699 }
4700
4701 /*
4702  * Initialize slot table
4703  */
4704 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4705                 int max_slots, int ivalue)
4706 {
4707         struct nfs4_slot *slot;
4708         int ret = -ENOMEM;
4709
4710         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4711
4712         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4713
4714         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4715         if (!slot)
4716                 goto out;
4717         ret = 0;
4718
4719         spin_lock(&tbl->slot_tbl_lock);
4720         tbl->max_slots = max_slots;
4721         tbl->slots = slot;
4722         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4723         spin_unlock(&tbl->slot_tbl_lock);
4724         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4725                 tbl, tbl->slots, tbl->max_slots);
4726 out:
4727         dprintk("<-- %s: return %d\n", __func__, ret);
4728         return ret;
4729 }
4730
4731 /*
4732  * Initialize the forechannel and backchannel tables
4733  */
4734 static int nfs4_init_slot_tables(struct nfs4_session *session)
4735 {
4736         struct nfs4_slot_table *tbl;
4737         int status = 0;
4738
4739         tbl = &session->fc_slot_table;
4740         if (tbl->slots == NULL) {
4741                 status = nfs4_init_slot_table(tbl,
4742                                 session->fc_attrs.max_reqs, 1);
4743                 if (status)
4744                         return status;
4745         }
4746
4747         tbl = &session->bc_slot_table;
4748         if (tbl->slots == NULL) {
4749                 status = nfs4_init_slot_table(tbl,
4750                                 session->bc_attrs.max_reqs, 0);
4751                 if (status)
4752                         nfs4_destroy_slot_tables(session);
4753         }
4754
4755         return status;
4756 }
4757
4758 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4759 {
4760         struct nfs4_session *session;
4761         struct nfs4_slot_table *tbl;
4762
4763         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4764         if (!session)
4765                 return NULL;
4766
4767         init_completion(&session->complete);
4768
4769         tbl = &session->fc_slot_table;
4770         tbl->highest_used_slotid = -1;
4771         spin_lock_init(&tbl->slot_tbl_lock);
4772         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4773
4774         tbl = &session->bc_slot_table;
4775         tbl->highest_used_slotid = -1;
4776         spin_lock_init(&tbl->slot_tbl_lock);
4777         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4778
4779         session->session_state = 1<<NFS4_SESSION_INITING;
4780
4781         session->clp = clp;
4782         return session;
4783 }
4784
4785 void nfs4_destroy_session(struct nfs4_session *session)
4786 {
4787         nfs4_proc_destroy_session(session);
4788         dprintk("%s Destroy backchannel for xprt %p\n",
4789                 __func__, session->clp->cl_rpcclient->cl_xprt);
4790         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4791                                 NFS41_BC_MIN_CALLBACKS);
4792         nfs4_destroy_slot_tables(session);
4793         kfree(session);
4794 }
4795
4796 /*
4797  * Initialize the values to be used by the client in CREATE_SESSION
4798  * If nfs4_init_session set the fore channel request and response sizes,
4799  * use them.
4800  *
4801  * Set the back channel max_resp_sz_cached to zero to force the client to
4802  * always set csa_cachethis to FALSE because the current implementation
4803  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4804  */
4805 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4806 {
4807         struct nfs4_session *session = args->client->cl_session;
4808         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4809                      mxresp_sz = session->fc_attrs.max_resp_sz;
4810
4811         if (mxrqst_sz == 0)
4812                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4813         if (mxresp_sz == 0)
4814                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4815         /* Fore channel attributes */
4816         args->fc_attrs.headerpadsz = 0;
4817         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4818         args->fc_attrs.max_resp_sz = mxresp_sz;
4819         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4820         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4821
4822         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4823                 "max_ops=%u max_reqs=%u\n",
4824                 __func__,
4825                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4826                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4827
4828         /* Back channel attributes */
4829         args->bc_attrs.headerpadsz = 0;
4830         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4831         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4832         args->bc_attrs.max_resp_sz_cached = 0;
4833         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4834         args->bc_attrs.max_reqs = 1;
4835
4836         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4837                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4838                 __func__,
4839                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4840                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4841                 args->bc_attrs.max_reqs);
4842 }
4843
4844 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4845 {
4846         if (rcvd <= sent)
4847                 return 0;
4848         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4849                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4850         return -EINVAL;
4851 }
4852
4853 #define _verify_fore_channel_attr(_name_) \
4854         _verify_channel_attr("fore", #_name_, \
4855                              args->fc_attrs._name_, \
4856                              session->fc_attrs._name_)
4857
4858 #define _verify_back_channel_attr(_name_) \
4859         _verify_channel_attr("back", #_name_, \
4860                              args->bc_attrs._name_, \
4861                              session->bc_attrs._name_)
4862
4863 /*
4864  * The server is not allowed to increase the fore channel header pad size,
4865  * maximum response size, or maximum number of operations.
4866  *
4867  * The back channel attributes are only negotiatied down: We send what the
4868  * (back channel) server insists upon.
4869  */
4870 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4871                                      struct nfs4_session *session)
4872 {
4873         int ret = 0;
4874
4875         ret |= _verify_fore_channel_attr(headerpadsz);
4876         ret |= _verify_fore_channel_attr(max_resp_sz);
4877         ret |= _verify_fore_channel_attr(max_ops);
4878
4879         ret |= _verify_back_channel_attr(headerpadsz);
4880         ret |= _verify_back_channel_attr(max_rqst_sz);
4881         ret |= _verify_back_channel_attr(max_resp_sz);
4882         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4883         ret |= _verify_back_channel_attr(max_ops);
4884         ret |= _verify_back_channel_attr(max_reqs);
4885
4886         return ret;
4887 }
4888
4889 static int _nfs4_proc_create_session(struct nfs_client *clp)
4890 {
4891         struct nfs4_session *session = clp->cl_session;
4892         struct nfs41_create_session_args args = {
4893                 .client = clp,
4894                 .cb_program = NFS4_CALLBACK,
4895         };
4896         struct nfs41_create_session_res res = {
4897                 .client = clp,
4898         };
4899         struct rpc_message msg = {
4900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4901                 .rpc_argp = &args,
4902                 .rpc_resp = &res,
4903         };
4904         int status;
4905
4906         nfs4_init_channel_attrs(&args);
4907         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4908
4909         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4910
4911         if (!status)
4912                 /* Verify the session's negotiated channel_attrs values */
4913                 status = nfs4_verify_channel_attrs(&args, session);
4914         if (!status) {
4915                 /* Increment the clientid slot sequence id */
4916                 clp->cl_seqid++;
4917         }
4918
4919         return status;
4920 }
4921
4922 /*
4923  * Issues a CREATE_SESSION operation to the server.
4924  * It is the responsibility of the caller to verify the session is
4925  * expired before calling this routine.
4926  */
4927 int nfs4_proc_create_session(struct nfs_client *clp)
4928 {
4929         int status;
4930         unsigned *ptr;
4931         struct nfs4_session *session = clp->cl_session;
4932
4933         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4934
4935         status = _nfs4_proc_create_session(clp);
4936         if (status)
4937                 goto out;
4938
4939         /* Init and reset the fore channel */
4940         status = nfs4_init_slot_tables(session);
4941         dprintk("slot table initialization returned %d\n", status);
4942         if (status)
4943                 goto out;
4944         status = nfs4_reset_slot_tables(session);
4945         dprintk("slot table reset returned %d\n", status);
4946         if (status)
4947                 goto out;
4948
4949         ptr = (unsigned *)&session->sess_id.data[0];
4950         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4951                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4952 out:
4953         dprintk("<-- %s\n", __func__);
4954         return status;
4955 }
4956
4957 /*
4958  * Issue the over-the-wire RPC DESTROY_SESSION.
4959  * The caller must serialize access to this routine.
4960  */
4961 int nfs4_proc_destroy_session(struct nfs4_session *session)
4962 {
4963         int status = 0;
4964         struct rpc_message msg;
4965
4966         dprintk("--> nfs4_proc_destroy_session\n");
4967
4968         /* session is still being setup */
4969         if (session->clp->cl_cons_state != NFS_CS_READY)
4970                 return status;
4971
4972         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4973         msg.rpc_argp = session;
4974         msg.rpc_resp = NULL;
4975         msg.rpc_cred = NULL;
4976         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4977
4978         if (status)
4979                 printk(KERN_WARNING
4980                         "Got error %d from the server on DESTROY_SESSION. "
4981                         "Session has been destroyed regardless...\n", status);
4982
4983         dprintk("<-- nfs4_proc_destroy_session\n");
4984         return status;
4985 }
4986
4987 int nfs4_init_session(struct nfs_server *server)
4988 {
4989         struct nfs_client *clp = server->nfs_client;
4990         struct nfs4_session *session;
4991         unsigned int rsize, wsize;
4992         int ret;
4993
4994         if (!nfs4_has_session(clp))
4995                 return 0;
4996
4997         session = clp->cl_session;
4998         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
4999                 return 0;
5000
5001         rsize = server->rsize;
5002         if (rsize == 0)
5003                 rsize = NFS_MAX_FILE_IO_SIZE;
5004         wsize = server->wsize;
5005         if (wsize == 0)
5006                 wsize = NFS_MAX_FILE_IO_SIZE;
5007
5008         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5009         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5010
5011         ret = nfs4_recover_expired_lease(server);
5012         if (!ret)
5013                 ret = nfs4_check_client_ready(clp);
5014         return ret;
5015 }
5016
5017 /*
5018  * Renew the cl_session lease.
5019  */
5020 struct nfs4_sequence_data {
5021         struct nfs_client *clp;
5022         struct nfs4_sequence_args args;
5023         struct nfs4_sequence_res res;
5024 };
5025
5026 static void nfs41_sequence_release(void *data)
5027 {
5028         struct nfs4_sequence_data *calldata = data;
5029         struct nfs_client *clp = calldata->clp;
5030
5031         if (atomic_read(&clp->cl_count) > 1)
5032                 nfs4_schedule_state_renewal(clp);
5033         nfs_put_client(clp);
5034         kfree(calldata);
5035 }
5036
5037 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5038 {
5039         switch(task->tk_status) {
5040         case -NFS4ERR_DELAY:
5041                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5042                 return -EAGAIN;
5043         default:
5044                 nfs4_schedule_state_recovery(clp);
5045         }
5046         return 0;
5047 }
5048
5049 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5050 {
5051         struct nfs4_sequence_data *calldata = data;
5052         struct nfs_client *clp = calldata->clp;
5053
5054         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5055                 return;
5056
5057         if (task->tk_status < 0) {
5058                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5059                 if (atomic_read(&clp->cl_count) == 1)
5060                         goto out;
5061
5062                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5063                         rpc_restart_call_prepare(task);
5064                         return;
5065                 }
5066         }
5067         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5068 out:
5069         dprintk("<-- %s\n", __func__);
5070 }
5071
5072 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5073 {
5074         struct nfs4_sequence_data *calldata = data;
5075         struct nfs_client *clp = calldata->clp;
5076         struct nfs4_sequence_args *args;
5077         struct nfs4_sequence_res *res;
5078
5079         args = task->tk_msg.rpc_argp;
5080         res = task->tk_msg.rpc_resp;
5081
5082         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5083                 return;
5084         rpc_call_start(task);
5085 }
5086
5087 static const struct rpc_call_ops nfs41_sequence_ops = {
5088         .rpc_call_done = nfs41_sequence_call_done,
5089         .rpc_call_prepare = nfs41_sequence_prepare,
5090         .rpc_release = nfs41_sequence_release,
5091 };
5092
5093 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5094 {
5095         struct nfs4_sequence_data *calldata;
5096         struct rpc_message msg = {
5097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5098                 .rpc_cred = cred,
5099         };
5100         struct rpc_task_setup task_setup_data = {
5101                 .rpc_client = clp->cl_rpcclient,
5102                 .rpc_message = &msg,
5103                 .callback_ops = &nfs41_sequence_ops,
5104                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5105         };
5106
5107         if (!atomic_inc_not_zero(&clp->cl_count))
5108                 return ERR_PTR(-EIO);
5109         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5110         if (calldata == NULL) {
5111                 nfs_put_client(clp);
5112                 return ERR_PTR(-ENOMEM);
5113         }
5114         msg.rpc_argp = &calldata->args;
5115         msg.rpc_resp = &calldata->res;
5116         calldata->clp = clp;
5117         task_setup_data.callback_data = calldata;
5118
5119         return rpc_run_task(&task_setup_data);
5120 }
5121
5122 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5123 {
5124         struct rpc_task *task;
5125         int ret = 0;
5126
5127         task = _nfs41_proc_sequence(clp, cred);
5128         if (IS_ERR(task))
5129                 ret = PTR_ERR(task);
5130         else
5131                 rpc_put_task(task);
5132         dprintk("<-- %s status=%d\n", __func__, ret);
5133         return ret;
5134 }
5135
5136 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5137 {
5138         struct rpc_task *task;
5139         int ret;
5140
5141         task = _nfs41_proc_sequence(clp, cred);
5142         if (IS_ERR(task)) {
5143                 ret = PTR_ERR(task);
5144                 goto out;
5145         }
5146         ret = rpc_wait_for_completion_task(task);
5147         if (!ret)
5148                 ret = task->tk_status;
5149         rpc_put_task(task);
5150 out:
5151         dprintk("<-- %s status=%d\n", __func__, ret);
5152         return ret;
5153 }
5154
5155 struct nfs4_reclaim_complete_data {
5156         struct nfs_client *clp;
5157         struct nfs41_reclaim_complete_args arg;
5158         struct nfs41_reclaim_complete_res res;
5159 };
5160
5161 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5162 {
5163         struct nfs4_reclaim_complete_data *calldata = data;
5164
5165         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5166         if (nfs41_setup_sequence(calldata->clp->cl_session,
5167                                 &calldata->arg.seq_args,
5168                                 &calldata->res.seq_res, 0, task))
5169                 return;
5170
5171         rpc_call_start(task);
5172 }
5173
5174 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5175 {
5176         switch(task->tk_status) {
5177         case 0:
5178         case -NFS4ERR_COMPLETE_ALREADY:
5179         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5180                 break;
5181         case -NFS4ERR_DELAY:
5182                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5183                 return -EAGAIN;
5184         default:
5185                 nfs4_schedule_state_recovery(clp);
5186         }
5187         return 0;
5188 }
5189
5190 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5191 {
5192         struct nfs4_reclaim_complete_data *calldata = data;
5193         struct nfs_client *clp = calldata->clp;
5194         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5195
5196         dprintk("--> %s\n", __func__);
5197         if (!nfs41_sequence_done(task, res))
5198                 return;
5199
5200         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5201                 rpc_restart_call_prepare(task);
5202                 return;
5203         }
5204         dprintk("<-- %s\n", __func__);
5205 }
5206
5207 static void nfs4_free_reclaim_complete_data(void *data)
5208 {
5209         struct nfs4_reclaim_complete_data *calldata = data;
5210
5211         kfree(calldata);
5212 }
5213
5214 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5215         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5216         .rpc_call_done = nfs4_reclaim_complete_done,
5217         .rpc_release = nfs4_free_reclaim_complete_data,
5218 };
5219
5220 /*
5221  * Issue a global reclaim complete.
5222  */
5223 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5224 {
5225         struct nfs4_reclaim_complete_data *calldata;
5226         struct rpc_task *task;
5227         struct rpc_message msg = {
5228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5229         };
5230         struct rpc_task_setup task_setup_data = {
5231                 .rpc_client = clp->cl_rpcclient,
5232                 .rpc_message = &msg,
5233                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5234                 .flags = RPC_TASK_ASYNC,
5235         };
5236         int status = -ENOMEM;
5237
5238         dprintk("--> %s\n", __func__);
5239         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5240         if (calldata == NULL)
5241                 goto out;
5242         calldata->clp = clp;
5243         calldata->arg.one_fs = 0;
5244
5245         msg.rpc_argp = &calldata->arg;
5246         msg.rpc_resp = &calldata->res;
5247         task_setup_data.callback_data = calldata;
5248         task = rpc_run_task(&task_setup_data);
5249         if (IS_ERR(task)) {
5250                 status = PTR_ERR(task);
5251                 goto out;
5252         }
5253         rpc_put_task(task);
5254         return 0;
5255 out:
5256         dprintk("<-- %s status=%d\n", __func__, status);
5257         return status;
5258 }
5259 #endif /* CONFIG_NFS_V4_1 */
5260
5261 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5262         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5263         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5264         .recover_open   = nfs4_open_reclaim,
5265         .recover_lock   = nfs4_lock_reclaim,
5266         .establish_clid = nfs4_init_clientid,
5267         .get_clid_cred  = nfs4_get_setclientid_cred,
5268 };
5269
5270 #if defined(CONFIG_NFS_V4_1)
5271 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5272         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5273         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5274         .recover_open   = nfs4_open_reclaim,
5275         .recover_lock   = nfs4_lock_reclaim,
5276         .establish_clid = nfs41_init_clientid,
5277         .get_clid_cred  = nfs4_get_exchange_id_cred,
5278         .reclaim_complete = nfs41_proc_reclaim_complete,
5279 };
5280 #endif /* CONFIG_NFS_V4_1 */
5281
5282 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5283         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5284         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5285         .recover_open   = nfs4_open_expired,
5286         .recover_lock   = nfs4_lock_expired,
5287         .establish_clid = nfs4_init_clientid,
5288         .get_clid_cred  = nfs4_get_setclientid_cred,
5289 };
5290
5291 #if defined(CONFIG_NFS_V4_1)
5292 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5293         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5294         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5295         .recover_open   = nfs4_open_expired,
5296         .recover_lock   = nfs4_lock_expired,
5297         .establish_clid = nfs41_init_clientid,
5298         .get_clid_cred  = nfs4_get_exchange_id_cred,
5299 };
5300 #endif /* CONFIG_NFS_V4_1 */
5301
5302 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5303         .sched_state_renewal = nfs4_proc_async_renew,
5304         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5305         .renew_lease = nfs4_proc_renew,
5306 };
5307
5308 #if defined(CONFIG_NFS_V4_1)
5309 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5310         .sched_state_renewal = nfs41_proc_async_sequence,
5311         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5312         .renew_lease = nfs4_proc_sequence,
5313 };
5314 #endif
5315
5316 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5317         .minor_version = 0,
5318         .call_sync = _nfs4_call_sync,
5319         .validate_stateid = nfs4_validate_delegation_stateid,
5320         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5321         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5322         .state_renewal_ops = &nfs40_state_renewal_ops,
5323 };
5324
5325 #if defined(CONFIG_NFS_V4_1)
5326 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5327         .minor_version = 1,
5328         .call_sync = _nfs4_call_sync_session,
5329         .validate_stateid = nfs41_validate_delegation_stateid,
5330         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5331         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5332         .state_renewal_ops = &nfs41_state_renewal_ops,
5333 };
5334 #endif
5335
5336 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5337         [0] = &nfs_v4_0_minor_ops,
5338 #if defined(CONFIG_NFS_V4_1)
5339         [1] = &nfs_v4_1_minor_ops,
5340 #endif
5341 };
5342
5343 static const struct inode_operations nfs4_file_inode_operations = {
5344         .permission     = nfs_permission,
5345         .getattr        = nfs_getattr,
5346         .setattr        = nfs_setattr,
5347         .getxattr       = nfs4_getxattr,
5348         .setxattr       = nfs4_setxattr,
5349         .listxattr      = nfs4_listxattr,
5350 };
5351
5352 const struct nfs_rpc_ops nfs_v4_clientops = {
5353         .version        = 4,                    /* protocol version */
5354         .dentry_ops     = &nfs4_dentry_operations,
5355         .dir_inode_ops  = &nfs4_dir_inode_operations,
5356         .file_inode_ops = &nfs4_file_inode_operations,
5357         .getroot        = nfs4_proc_get_root,
5358         .getattr        = nfs4_proc_getattr,
5359         .setattr        = nfs4_proc_setattr,
5360         .lookupfh       = nfs4_proc_lookupfh,
5361         .lookup         = nfs4_proc_lookup,
5362         .access         = nfs4_proc_access,
5363         .readlink       = nfs4_proc_readlink,
5364         .create         = nfs4_proc_create,
5365         .remove         = nfs4_proc_remove,
5366         .unlink_setup   = nfs4_proc_unlink_setup,
5367         .unlink_done    = nfs4_proc_unlink_done,
5368         .rename         = nfs4_proc_rename,
5369         .rename_setup   = nfs4_proc_rename_setup,
5370         .rename_done    = nfs4_proc_rename_done,
5371         .link           = nfs4_proc_link,
5372         .symlink        = nfs4_proc_symlink,
5373         .mkdir          = nfs4_proc_mkdir,
5374         .rmdir          = nfs4_proc_remove,
5375         .readdir        = nfs4_proc_readdir,
5376         .mknod          = nfs4_proc_mknod,
5377         .statfs         = nfs4_proc_statfs,
5378         .fsinfo         = nfs4_proc_fsinfo,
5379         .pathconf       = nfs4_proc_pathconf,
5380         .set_capabilities = nfs4_server_capabilities,
5381         .decode_dirent  = nfs4_decode_dirent,
5382         .read_setup     = nfs4_proc_read_setup,
5383         .read_done      = nfs4_read_done,
5384         .write_setup    = nfs4_proc_write_setup,
5385         .write_done     = nfs4_write_done,
5386         .commit_setup   = nfs4_proc_commit_setup,
5387         .commit_done    = nfs4_commit_done,
5388         .lock           = nfs4_proc_lock,
5389         .clear_acl_cache = nfs4_zap_acl_attr,
5390         .close_context  = nfs4_close_context,
5391         .open_context   = nfs4_atomic_open,
5392 };
5393
5394 /*
5395  * Local variables:
5396  *  c-basic-offset: 8
5397  * End:
5398  */