fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  74                             struct nfs_fattr *fattr, struct iattr *sattr,
  75                             struct nfs4_state *state);
  76
  77 /* Prevent leaks of NFSv4 errors into userland */
  78 static int nfs4_map_errors(int err)
  79 {
  80         if (err >= -1000)
  81                 return err;
  82         switch (err) {
  83         case -NFS4ERR_RESOURCE:
  84                 return -EREMOTEIO;
  85         default:
  86                 dprintk("%s could not handle NFSv4 error %d\n",
  87                                 __func__, -err);
  88                 break;
  89         }
  90         return -EIO;
  91 }
  92
  93 /*
  94  * This is our standard bitmap for GETATTR requests.
  95  */
  96 const u32 nfs4_fattr_bitmap[2] = {
  97         FATTR4_WORD0_TYPE
  98         | FATTR4_WORD0_CHANGE
  99         | FATTR4_WORD0_SIZE
 100         | FATTR4_WORD0_FSID
 101         | FATTR4_WORD0_FILEID,
 102         FATTR4_WORD1_MODE
 103         | FATTR4_WORD1_NUMLINKS
 104         | FATTR4_WORD1_OWNER
 105         | FATTR4_WORD1_OWNER_GROUP
 106         | FATTR4_WORD1_RAWDEV
 107         | FATTR4_WORD1_SPACE_USED
 108         | FATTR4_WORD1_TIME_ACCESS
 109         | FATTR4_WORD1_TIME_METADATA
 110         | FATTR4_WORD1_TIME_MODIFY
 111 };
 112
 113 const u32 nfs4_statfs_bitmap[2] = {
 114         FATTR4_WORD0_FILES_AVAIL
 115         | FATTR4_WORD0_FILES_FREE
 116         | FATTR4_WORD0_FILES_TOTAL,
 117         FATTR4_WORD1_SPACE_AVAIL
 118         | FATTR4_WORD1_SPACE_FREE
 119         | FATTR4_WORD1_SPACE_TOTAL
 120 };
 121
 122 const u32 nfs4_pathconf_bitmap[2] = {
 123         FATTR4_WORD0_MAXLINK
 124         | FATTR4_WORD0_MAXNAME,
 125         0
 126 };
 127
 128 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 129                         | FATTR4_WORD0_MAXREAD
 130                         | FATTR4_WORD0_MAXWRITE
 131                         | FATTR4_WORD0_LEASE_TIME,
 132                         0
 133 };
 134
 135 const u32 nfs4_fs_locations_bitmap[2] = {
 136         FATTR4_WORD0_TYPE
 137         | FATTR4_WORD0_CHANGE
 138         | FATTR4_WORD0_SIZE
 139         | FATTR4_WORD0_FSID
 140         | FATTR4_WORD0_FILEID
 141         | FATTR4_WORD0_FS_LOCATIONS,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY
 151         | FATTR4_WORD1_MOUNTED_ON_FILEID
 152 };
 153
 154 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 155                 struct nfs4_readdir_arg *readdir)
 156 {
 157         __be32 *start, *p;
 158
 159         BUG_ON(readdir->count < 80);
 160         if (cookie > 2) {
 161                 readdir->cookie = cookie;
 162                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 163                 return;
 164         }
 165
 166         readdir->cookie = 0;
 167         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 168         if (cookie == 2)
 169                 return;
 170
 171         /*
 172          * NFSv4 servers do not return entries for '.' and '..'
 173          * Therefore, we fake these entries here.  We let '.'
 174          * have cookie 0 and '..' have cookie 1.  Note that
 175          * when talking to the server, we always send cookie 0
 176          * instead of 1 or 2.
 177          */
 178         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 179
 180         if (cookie == 0) {
 181                 *p++ = xdr_one;                                  /* next */
 182                 *p++ = xdr_zero;                   /* cookie, first word */
 183                 *p++ = xdr_one;                   /* cookie, second word */
 184                 *p++ = xdr_one;                             /* entry len */
 185                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 186                 p++;
 187                 *p++ = xdr_one;                         /* bitmap length */
 188                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189                 *p++ = htonl(8);              /* attribute buffer length */
 190                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 191         }
 192
 193         *p++ = xdr_one;                                  /* next */
 194         *p++ = xdr_zero;                   /* cookie, first word */
 195         *p++ = xdr_two;                   /* cookie, second word */
 196         *p++ = xdr_two;                             /* entry len */
 197         memcpy(p, "..\0\0", 4);                         /* entry */
 198         p++;
 199         *p++ = xdr_one;                         /* bitmap length */
 200         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201         *p++ = htonl(8);              /* attribute buffer length */
 202         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 203
 204         readdir->pgbase = (char *)p - (char *)start;
 205         readdir->count -= readdir->pgbase;
 206         kunmap_atomic(start, KM_USER0);
 207 }
 208
 209 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 210 {
 211         int res;
 212
 213         might_sleep();
 214
 215         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 216                         nfs_wait_bit_killable, TASK_KILLABLE);
 217         return res;
 218 }
 219
 220 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 221 {
 222         int res = 0;
 223
 224         might_sleep();
 225
 226         if (*timeout <= 0)
 227                 *timeout = NFS4_POLL_RETRY_MIN;
 228         if (*timeout > NFS4_POLL_RETRY_MAX)
 229                 *timeout = NFS4_POLL_RETRY_MAX;
 230         schedule_timeout_killable(*timeout);
 231         if (fatal_signal_pending(current))
 232                 res = -ERESTARTSYS;
 233         *timeout <<= 1;
 234         return res;
 235 }
 236
 237 /* This is the error handling routine for processes that are allowed
 238  * to sleep.
 239  */
 240 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 241 {
 242         struct nfs_client *clp = server->nfs_client;
 243         struct nfs4_state *state = exception->state;
 244         int ret = errorcode;
 245
 246         exception->retry = 0;
 247         switch(errorcode) {
 248                 case 0:
 249                         return 0;
 250                 case -NFS4ERR_ADMIN_REVOKED:
 251                 case -NFS4ERR_BAD_STATEID:
 252                 case -NFS4ERR_OPENMODE:
 253                         if (state == NULL)
 254                                 break;
 255                         nfs4_state_mark_reclaim_nograce(clp, state);
 256                         goto do_state_recovery;
 257                 case -NFS4ERR_STALE_STATEID:
 258                 case -NFS4ERR_STALE_CLIENTID:
 259                 case -NFS4ERR_EXPIRED:
 260                         goto do_state_recovery;
 261 #if defined(CONFIG_NFS_V4_1)
 262                 case -NFS4ERR_BADSESSION:
 263                 case -NFS4ERR_BADSLOT:
 264                 case -NFS4ERR_BAD_HIGH_SLOT:
 265                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 266                 case -NFS4ERR_DEADSESSION:
 267                 case -NFS4ERR_SEQ_FALSE_RETRY:
 268                 case -NFS4ERR_SEQ_MISORDERED:
 269                         dprintk("%s ERROR: %d Reset session\n", __func__,
 270                                 errorcode);
 271                         nfs4_schedule_state_recovery(clp);
 272                         exception->retry = 1;
 273                         break;
 274 #endif /* defined(CONFIG_NFS_V4_1) */
 275                 case -NFS4ERR_FILE_OPEN:
 276                         if (exception->timeout > HZ) {
 277                                 /* We have retried a decent amount, time to
 278                                  * fail
 279                                  */
 280                                 ret = -EBUSY;
 281                                 break;
 282                         }
 283                 case -NFS4ERR_GRACE:
 284                 case -NFS4ERR_DELAY:
 285                 case -EKEYEXPIRED:
 286                         ret = nfs4_delay(server->client, &exception->timeout);
 287                         if (ret != 0)
 288                                 break;
 289                 case -NFS4ERR_OLD_STATEID:
 290                         exception->retry = 1;
 291         }
 292         /* We failed to handle the error */
 293         return nfs4_map_errors(ret);
 294 do_state_recovery:
 295         nfs4_schedule_state_recovery(clp);
 296         ret = nfs4_wait_clnt_recover(clp);
 297         if (ret == 0)
 298                 exception->retry = 1;
 299         return ret;
 300 }
 301
 302
 303 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 304 {
 305         spin_lock(&clp->cl_lock);
 306         if (time_before(clp->cl_last_renewal,timestamp))
 307                 clp->cl_last_renewal = timestamp;
 308         spin_unlock(&clp->cl_lock);
 309 }
 310
 311 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 312 {
 313         do_renew_lease(server->nfs_client, timestamp);
 314 }
 315
 316 #if defined(CONFIG_NFS_V4_1)
 317
 318 /*
 319  * nfs4_free_slot - free a slot and efficiently update slot table.
 320  *
 321  * freeing a slot is trivially done by clearing its respective bit
 322  * in the bitmap.
 323  * If the freed slotid equals highest_used_slotid we want to update it
 324  * so that the server would be able to size down the slot table if needed,
 325  * otherwise we know that the highest_used_slotid is still in use.
 326  * When updating highest_used_slotid there may be "holes" in the bitmap
 327  * so we need to scan down from highest_used_slotid to 0 looking for the now
 328  * highest slotid in use.
 329  * If none found, highest_used_slotid is set to -1.
 330  *
 331  * Must be called while holding tbl->slot_tbl_lock
 332  */
 333 static void
 334 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 335 {
 336         int free_slotid = free_slot - tbl->slots;
 337         int slotid = free_slotid;
 338
 339         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 340         /* clear used bit in bitmap */
 341         __clear_bit(slotid, tbl->used_slots);
 342
 343         /* update highest_used_slotid when it is freed */
 344         if (slotid == tbl->highest_used_slotid) {
 345                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 346                 if (slotid < tbl->max_slots)
 347                         tbl->highest_used_slotid = slotid;
 348                 else
 349                         tbl->highest_used_slotid = -1;
 350         }
 351         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 352                 free_slotid, tbl->highest_used_slotid);
 353 }
 354
 355 /*
 356  * Signal state manager thread if session is drained
 357  */
 358 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 359 {
 360         struct rpc_task *task;
 361
 362         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 363                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 364                 if (task)
 365                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 366                 return;
 367         }
 368
 369         if (ses->fc_slot_table.highest_used_slotid != -1)
 370                 return;
 371
 372         dprintk("%s COMPLETE: Session Drained\n", __func__);
 373         complete(&ses->complete);
 374 }
 375
 376 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 377 {
 378         struct nfs4_slot_table *tbl;
 379
 380         tbl = &res->sr_session->fc_slot_table;
 381         if (!res->sr_slot) {
 382                 /* just wake up the next guy waiting since
 383                  * we may have not consumed a slot after all */
 384                 dprintk("%s: No slot\n", __func__);
 385                 return;
 386         }
 387
 388         spin_lock(&tbl->slot_tbl_lock);
 389         nfs4_free_slot(tbl, res->sr_slot);
 390         nfs41_check_drain_session_complete(res->sr_session);
 391         spin_unlock(&tbl->slot_tbl_lock);
 392         res->sr_slot = NULL;
 393 }
 394
 395 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 396 {
 397         unsigned long timestamp;
 398         struct nfs_client *clp;
 399
 400         /*
 401          * sr_status remains 1 if an RPC level error occurred. The server
 402          * may or may not have processed the sequence operation..
 403          * Proceed as if the server received and processed the sequence
 404          * operation.
 405          */
 406         if (res->sr_status == 1)
 407                 res->sr_status = NFS_OK;
 408
 409         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 410         if (!res->sr_slot)
 411                 goto out;
 412
 413         /* Check the SEQUENCE operation status */
 414         switch (res->sr_status) {
 415         case 0:
 416                 /* Update the slot's sequence and clientid lease timer */
 417                 ++res->sr_slot->seq_nr;
 418                 timestamp = res->sr_renewal_time;
 419                 clp = res->sr_session->clp;
 420                 do_renew_lease(clp, timestamp);
 421                 /* Check sequence flags */
 422                 if (atomic_read(&clp->cl_count) > 1)
 423                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 424                 break;
 425         case -NFS4ERR_DELAY:
 426                 /* The server detected a resend of the RPC call and
 427                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 428                  * of RFC5661.
 429                  */
 430                 dprintk("%s: slot=%ld seq=%d: Operation in progress\n",
 431                         __func__,
 432                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 433                         res->sr_slot->seq_nr);
 434                 goto out_retry;
 435         default:
 436                 /* Just update the slot sequence no. */
 437                 ++res->sr_slot->seq_nr;
 438         }
 439 out:
 440         /* The session may be reset by one of the error handlers. */
 441         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 442         nfs41_sequence_free_slot(res);
 443         return 1;
 444 out_retry:
 445         if (!rpc_restart_call(task))
 446                 goto out;
 447         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 448         return 0;
 449 }
 450
 451 static int nfs4_sequence_done(struct rpc_task *task,
 452                                struct nfs4_sequence_res *res)
 453 {
 454         if (res->sr_session == NULL)
 455                 return 1;
 456         return nfs41_sequence_done(task, res);
 457 }
 458
 459 /*
 460  * nfs4_find_slot - efficiently look for a free slot
 461  *
 462  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 463  * If found, we mark the slot as used, update the highest_used_slotid,
 464  * and respectively set up the sequence operation args.
 465  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 466  *
 467  * Note: must be called with under the slot_tbl_lock.
 468  */
 469 static u8
 470 nfs4_find_slot(struct nfs4_slot_table *tbl)
 471 {
 472         int slotid;
 473         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 474         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 475
 476         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 477                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 478                 tbl->max_slots);
 479         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 480         if (slotid >= tbl->max_slots)
 481                 goto out;
 482         __set_bit(slotid, tbl->used_slots);
 483         if (slotid > tbl->highest_used_slotid)
 484                 tbl->highest_used_slotid = slotid;
 485         ret_id = slotid;
 486 out:
 487         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 488                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 489         return ret_id;
 490 }
 491
 492 static int nfs41_setup_sequence(struct nfs4_session *session,
 493                                 struct nfs4_sequence_args *args,
 494                                 struct nfs4_sequence_res *res,
 495                                 int cache_reply,
 496                                 struct rpc_task *task)
 497 {
 498         struct nfs4_slot *slot;
 499         struct nfs4_slot_table *tbl;
 500         u8 slotid;
 501
 502         dprintk("--> %s\n", __func__);
 503         /* slot already allocated? */
 504         if (res->sr_slot != NULL)
 505                 return 0;
 506
 507         tbl = &session->fc_slot_table;
 508
 509         spin_lock(&tbl->slot_tbl_lock);
 510         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 511             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 512                 /*
 513                  * The state manager will wait until the slot table is empty.
 514                  * Schedule the reset thread
 515                  */
 516                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 517                 spin_unlock(&tbl->slot_tbl_lock);
 518                 dprintk("%s Schedule Session Reset\n", __func__);
 519                 return -EAGAIN;
 520         }
 521
 522         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 523             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 524                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 525                 spin_unlock(&tbl->slot_tbl_lock);
 526                 dprintk("%s enforce FIFO order\n", __func__);
 527                 return -EAGAIN;
 528         }
 529
 530         slotid = nfs4_find_slot(tbl);
 531         if (slotid == NFS4_MAX_SLOT_TABLE) {
 532                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 533                 spin_unlock(&tbl->slot_tbl_lock);
 534                 dprintk("<-- %s: no free slots\n", __func__);
 535                 return -EAGAIN;
 536         }
 537         spin_unlock(&tbl->slot_tbl_lock);
 538
 539         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 540         slot = tbl->slots + slotid;
 541         args->sa_session = session;
 542         args->sa_slotid = slotid;
 543         args->sa_cache_this = cache_reply;
 544
 545         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 546
 547         res->sr_session = session;
 548         res->sr_slot = slot;
 549         res->sr_renewal_time = jiffies;
 550         res->sr_status_flags = 0;
 551         /*
 552          * sr_status is only set in decode_sequence, and so will remain
 553          * set to 1 if an rpc level failure occurs.
 554          */
 555         res->sr_status = 1;
 556         return 0;
 557 }
 558
 559 int nfs4_setup_sequence(const struct nfs_server *server,
 560                         struct nfs4_sequence_args *args,
 561                         struct nfs4_sequence_res *res,
 562                         int cache_reply,
 563                         struct rpc_task *task)
 564 {
 565         struct nfs4_session *session = nfs4_get_session(server);
 566         int ret = 0;
 567
 568         if (session == NULL) {
 569                 args->sa_session = NULL;
 570                 res->sr_session = NULL;
 571                 goto out;
 572         }
 573
 574         dprintk("--> %s clp %p session %p sr_slot %ld\n",
 575                 __func__, session->clp, session, res->sr_slot ?
 576                         res->sr_slot - session->fc_slot_table.slots : -1);
 577
 578         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 579                                    task);
 580 out:
 581         dprintk("<-- %s status=%d\n", __func__, ret);
 582         return ret;
 583 }
 584
 585 struct nfs41_call_sync_data {
 586         const struct nfs_server *seq_server;
 587         struct nfs4_sequence_args *seq_args;
 588         struct nfs4_sequence_res *seq_res;
 589         int cache_reply;
 590 };
 591
 592 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 593 {
 594         struct nfs41_call_sync_data *data = calldata;
 595
 596         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 597
 598         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 599                                 data->seq_res, data->cache_reply, task))
 600                 return;
 601         rpc_call_start(task);
 602 }
 603
 604 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 605 {
 606         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 607         nfs41_call_sync_prepare(task, calldata);
 608 }
 609
 610 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 611 {
 612         struct nfs41_call_sync_data *data = calldata;
 613
 614         nfs41_sequence_done(task, data->seq_res);
 615 }
 616
 617 struct rpc_call_ops nfs41_call_sync_ops = {
 618         .rpc_call_prepare = nfs41_call_sync_prepare,
 619         .rpc_call_done = nfs41_call_sync_done,
 620 };
 621
 622 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 623         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 624         .rpc_call_done = nfs41_call_sync_done,
 625 };
 626
 627 static int nfs4_call_sync_sequence(struct nfs_server *server,
 628                                    struct rpc_message *msg,
 629                                    struct nfs4_sequence_args *args,
 630                                    struct nfs4_sequence_res *res,
 631                                    int cache_reply,
 632                                    int privileged)
 633 {
 634         int ret;
 635         struct rpc_task *task;
 636         struct nfs41_call_sync_data data = {
 637                 .seq_server = server,
 638                 .seq_args = args,
 639                 .seq_res = res,
 640                 .cache_reply = cache_reply,
 641         };
 642         struct rpc_task_setup task_setup = {
 643                 .rpc_client = server->client,
 644                 .rpc_message = msg,
 645                 .callback_ops = &nfs41_call_sync_ops,
 646                 .callback_data = &data
 647         };
 648
 649         res->sr_slot = NULL;
 650         if (privileged)
 651                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 652         task = rpc_run_task(&task_setup);
 653         if (IS_ERR(task))
 654                 ret = PTR_ERR(task);
 655         else {
 656                 ret = task->tk_status;
 657                 rpc_put_task(task);
 658         }
 659         return ret;
 660 }
 661
 662 int _nfs4_call_sync_session(struct nfs_server *server,
 663                             struct rpc_message *msg,
 664                             struct nfs4_sequence_args *args,
 665                             struct nfs4_sequence_res *res,
 666                             int cache_reply)
 667 {
 668         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 669 }
 670
 671 #else
 672 static int nfs4_sequence_done(struct rpc_task *task,
 673                                struct nfs4_sequence_res *res)
 674 {
 675         return 1;
 676 }
 677 #endif /* CONFIG_NFS_V4_1 */
 678
 679 int _nfs4_call_sync(struct nfs_server *server,
 680                     struct rpc_message *msg,
 681                     struct nfs4_sequence_args *args,
 682                     struct nfs4_sequence_res *res,
 683                     int cache_reply)
 684 {
 685         args->sa_session = res->sr_session = NULL;
 686         return rpc_call_sync(server->client, msg, 0);
 687 }
 688
 689 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 690         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 691                         &(res)->seq_res, (cache_reply))
 692
 693 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 694 {
 695         struct nfs_inode *nfsi = NFS_I(dir);
 696
 697         spin_lock(&dir->i_lock);
 698         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 699         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 700                 nfs_force_lookup_revalidate(dir);
 701         nfsi->change_attr = cinfo->after;
 702         spin_unlock(&dir->i_lock);
 703 }
 704
 705 struct nfs4_opendata {
 706         struct kref kref;
 707         struct nfs_openargs o_arg;
 708         struct nfs_openres o_res;
 709         struct nfs_open_confirmargs c_arg;
 710         struct nfs_open_confirmres c_res;
 711         struct nfs_fattr f_attr;
 712         struct nfs_fattr dir_attr;
 713         struct path path;
 714         struct dentry *dir;
 715         struct nfs4_state_owner *owner;
 716         struct nfs4_state *state;
 717         struct iattr attrs;
 718         unsigned long timestamp;
 719         unsigned int rpc_done : 1;
 720         int rpc_status;
 721         int cancelled;
 722 };
 723
 724
 725 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 726 {
 727         p->o_res.f_attr = &p->f_attr;
 728         p->o_res.dir_attr = &p->dir_attr;
 729         p->o_res.seqid = p->o_arg.seqid;
 730         p->c_res.seqid = p->c_arg.seqid;
 731         p->o_res.server = p->o_arg.server;
 732         nfs_fattr_init(&p->f_attr);
 733         nfs_fattr_init(&p->dir_attr);
 734 }
 735
 736 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 737                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 738                 const struct iattr *attrs,
 739                 gfp_t gfp_mask)
 740 {
 741         struct dentry *parent = dget_parent(path->dentry);
 742         struct inode *dir = parent->d_inode;
 743         struct nfs_server *server = NFS_SERVER(dir);
 744         struct nfs4_opendata *p;
 745
 746         p = kzalloc(sizeof(*p), gfp_mask);
 747         if (p == NULL)
 748                 goto err;
 749         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 750         if (p->o_arg.seqid == NULL)
 751                 goto err_free;
 752         path_get(path);
 753         p->path = *path;
 754         p->dir = parent;
 755         p->owner = sp;
 756         atomic_inc(&sp->so_count);
 757         p->o_arg.fh = NFS_FH(dir);
 758         p->o_arg.open_flags = flags;
 759         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 760         p->o_arg.clientid = server->nfs_client->cl_clientid;
 761         p->o_arg.id = sp->so_owner_id.id;
 762         p->o_arg.name = &p->path.dentry->d_name;
 763         p->o_arg.server = server;
 764         p->o_arg.bitmask = server->attr_bitmask;
 765         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 766         if (flags & O_CREAT) {
 767                 u32 *s;
 768
 769                 p->o_arg.u.attrs = &p->attrs;
 770                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 771                 s = (u32 *) p->o_arg.u.verifier.data;
 772                 s[0] = jiffies;
 773                 s[1] = current->pid;
 774         }
 775         p->c_arg.fh = &p->o_res.fh;
 776         p->c_arg.stateid = &p->o_res.stateid;
 777         p->c_arg.seqid = p->o_arg.seqid;
 778         nfs4_init_opendata_res(p);
 779         kref_init(&p->kref);
 780         return p;
 781 err_free:
 782         kfree(p);
 783 err:
 784         dput(parent);
 785         return NULL;
 786 }
 787
 788 static void nfs4_opendata_free(struct kref *kref)
 789 {
 790         struct nfs4_opendata *p = container_of(kref,
 791                         struct nfs4_opendata, kref);
 792
 793         nfs_free_seqid(p->o_arg.seqid);
 794         if (p->state != NULL)
 795                 nfs4_put_open_state(p->state);
 796         nfs4_put_state_owner(p->owner);
 797         dput(p->dir);
 798         path_put(&p->path);
 799         kfree(p);
 800 }
 801
 802 static void nfs4_opendata_put(struct nfs4_opendata *p)
 803 {
 804         if (p != NULL)
 805                 kref_put(&p->kref, nfs4_opendata_free);
 806 }
 807
 808 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 809 {
 810         int ret;
 811
 812         ret = rpc_wait_for_completion_task(task);
 813         return ret;
 814 }
 815
 816 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 817 {
 818         int ret = 0;
 819
 820         if (open_mode & O_EXCL)
 821                 goto out;
 822         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 823                 case FMODE_READ:
 824                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 825                                 && state->n_rdonly != 0;
 826                         break;
 827                 case FMODE_WRITE:
 828                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 829                                 && state->n_wronly != 0;
 830                         break;
 831                 case FMODE_READ|FMODE_WRITE:
 832                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 833                                 && state->n_rdwr != 0;
 834         }
 835 out:
 836         return ret;
 837 }
 838
 839 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 840 {
 841         if ((delegation->type & fmode) != fmode)
 842                 return 0;
 843         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 844                 return 0;
 845         nfs_mark_delegation_referenced(delegation);
 846         return 1;
 847 }
 848
 849 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 850 {
 851         switch (fmode) {
 852                 case FMODE_WRITE:
 853                         state->n_wronly++;
 854                         break;
 855                 case FMODE_READ:
 856                         state->n_rdonly++;
 857                         break;
 858                 case FMODE_READ|FMODE_WRITE:
 859                         state->n_rdwr++;
 860         }
 861         nfs4_state_set_mode_locked(state, state->state | fmode);
 862 }
 863
 864 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 865 {
 866         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 867                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 868         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 869         switch (fmode) {
 870                 case FMODE_READ:
 871                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 872                         break;
 873                 case FMODE_WRITE:
 874                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 875                         break;
 876                 case FMODE_READ|FMODE_WRITE:
 877                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 878         }
 879 }
 880
 881 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 882 {
 883         write_seqlock(&state->seqlock);
 884         nfs_set_open_stateid_locked(state, stateid, fmode);
 885         write_sequnlock(&state->seqlock);
 886 }
 887
 888 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 889 {
 890         /*
 891          * Protect the call to nfs4_state_set_mode_locked and
 892          * serialise the stateid update
 893          */
 894         write_seqlock(&state->seqlock);
 895         if (deleg_stateid != NULL) {
 896                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 897                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 898         }
 899         if (open_stateid != NULL)
 900                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 901         write_sequnlock(&state->seqlock);
 902         spin_lock(&state->owner->so_lock);
 903         update_open_stateflags(state, fmode);
 904         spin_unlock(&state->owner->so_lock);
 905 }
 906
 907 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 908 {
 909         struct nfs_inode *nfsi = NFS_I(state->inode);
 910         struct nfs_delegation *deleg_cur;
 911         int ret = 0;
 912
 913         fmode &= (FMODE_READ|FMODE_WRITE);
 914
 915         rcu_read_lock();
 916         deleg_cur = rcu_dereference(nfsi->delegation);
 917         if (deleg_cur == NULL)
 918                 goto no_delegation;
 919
 920         spin_lock(&deleg_cur->lock);
 921         if (nfsi->delegation != deleg_cur ||
 922             (deleg_cur->type & fmode) != fmode)
 923                 goto no_delegation_unlock;
 924
 925         if (delegation == NULL)
 926                 delegation = &deleg_cur->stateid;
 927         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 928                 goto no_delegation_unlock;
 929
 930         nfs_mark_delegation_referenced(deleg_cur);
 931         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 932         ret = 1;
 933 no_delegation_unlock:
 934         spin_unlock(&deleg_cur->lock);
 935 no_delegation:
 936         rcu_read_unlock();
 937
 938         if (!ret && open_stateid != NULL) {
 939                 __update_open_stateid(state, open_stateid, NULL, fmode);
 940                 ret = 1;
 941         }
 942
 943         return ret;
 944 }
 945
 946
 947 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 948 {
 949         struct nfs_delegation *delegation;
 950
 951         rcu_read_lock();
 952         delegation = rcu_dereference(NFS_I(inode)->delegation);
 953         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 954                 rcu_read_unlock();
 955                 return;
 956         }
 957         rcu_read_unlock();
 958         nfs_inode_return_delegation(inode);
 959 }
 960
 961 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 962 {
 963         struct nfs4_state *state = opendata->state;
 964         struct nfs_inode *nfsi = NFS_I(state->inode);
 965         struct nfs_delegation *delegation;
 966         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 967         fmode_t fmode = opendata->o_arg.fmode;
 968         nfs4_stateid stateid;
 969         int ret = -EAGAIN;
 970
 971         for (;;) {
 972                 if (can_open_cached(state, fmode, open_mode)) {
 973                         spin_lock(&state->owner->so_lock);
 974                         if (can_open_cached(state, fmode, open_mode)) {
 975                                 update_open_stateflags(state, fmode);
 976                                 spin_unlock(&state->owner->so_lock);
 977                                 goto out_return_state;
 978                         }
 979                         spin_unlock(&state->owner->so_lock);
 980                 }
 981                 rcu_read_lock();
 982                 delegation = rcu_dereference(nfsi->delegation);
 983                 if (delegation == NULL ||
 984                     !can_open_delegated(delegation, fmode)) {
 985                         rcu_read_unlock();
 986                         break;
 987                 }
 988                 /* Save the delegation */
 989                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 990                 rcu_read_unlock();
 991                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 992                 if (ret != 0)
 993                         goto out;
 994                 ret = -EAGAIN;
 995
 996                 /* Try to update the stateid using the delegation */
 997                 if (update_open_stateid(state, NULL, &stateid, fmode))
 998                         goto out_return_state;
 999         }
1000 out:
1001         return ERR_PTR(ret);
1002 out_return_state:
1003         atomic_inc(&state->count);
1004         return state;
1005 }
1006
1007 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1008 {
1009         struct inode *inode;
1010         struct nfs4_state *state = NULL;
1011         struct nfs_delegation *delegation;
1012         int ret;
1013
1014         if (!data->rpc_done) {
1015                 state = nfs4_try_open_cached(data);
1016                 goto out;
1017         }
1018
1019         ret = -EAGAIN;
1020         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1021                 goto err;
1022         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1023         ret = PTR_ERR(inode);
1024         if (IS_ERR(inode))
1025                 goto err;
1026         ret = -ENOMEM;
1027         state = nfs4_get_open_state(inode, data->owner);
1028         if (state == NULL)
1029                 goto err_put_inode;
1030         if (data->o_res.delegation_type != 0) {
1031                 int delegation_flags = 0;
1032
1033                 rcu_read_lock();
1034                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1035                 if (delegation)
1036                         delegation_flags = delegation->flags;
1037                 rcu_read_unlock();
1038                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1039                         nfs_inode_set_delegation(state->inode,
1040                                         data->owner->so_cred,
1041                                         &data->o_res);
1042                 else
1043                         nfs_inode_reclaim_delegation(state->inode,
1044                                         data->owner->so_cred,
1045                                         &data->o_res);
1046         }
1047
1048         update_open_stateid(state, &data->o_res.stateid, NULL,
1049                         data->o_arg.fmode);
1050         iput(inode);
1051 out:
1052         return state;
1053 err_put_inode:
1054         iput(inode);
1055 err:
1056         return ERR_PTR(ret);
1057 }
1058
1059 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1060 {
1061         struct nfs_inode *nfsi = NFS_I(state->inode);
1062         struct nfs_open_context *ctx;
1063
1064         spin_lock(&state->inode->i_lock);
1065         list_for_each_entry(ctx, &nfsi->open_files, list) {
1066                 if (ctx->state != state)
1067                         continue;
1068                 get_nfs_open_context(ctx);
1069                 spin_unlock(&state->inode->i_lock);
1070                 return ctx;
1071         }
1072         spin_unlock(&state->inode->i_lock);
1073         return ERR_PTR(-ENOENT);
1074 }
1075
1076 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1077 {
1078         struct nfs4_opendata *opendata;
1079
1080         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1081         if (opendata == NULL)
1082                 return ERR_PTR(-ENOMEM);
1083         opendata->state = state;
1084         atomic_inc(&state->count);
1085         return opendata;
1086 }
1087
1088 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1089 {
1090         struct nfs4_state *newstate;
1091         int ret;
1092
1093         opendata->o_arg.open_flags = 0;
1094         opendata->o_arg.fmode = fmode;
1095         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1096         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1097         nfs4_init_opendata_res(opendata);
1098         ret = _nfs4_recover_proc_open(opendata);
1099         if (ret != 0)
1100                 return ret;
1101         newstate = nfs4_opendata_to_nfs4_state(opendata);
1102         if (IS_ERR(newstate))
1103                 return PTR_ERR(newstate);
1104         nfs4_close_state(&opendata->path, newstate, fmode);
1105         *res = newstate;
1106         return 0;
1107 }
1108
1109 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1110 {
1111         struct nfs4_state *newstate;
1112         int ret;
1113
1114         /* memory barrier prior to reading state->n_* */
1115         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1116         smp_rmb();
1117         if (state->n_rdwr != 0) {
1118                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1119                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1120                 if (ret != 0)
1121                         return ret;
1122                 if (newstate != state)
1123                         return -ESTALE;
1124         }
1125         if (state->n_wronly != 0) {
1126                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1127                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1128                 if (ret != 0)
1129                         return ret;
1130                 if (newstate != state)
1131                         return -ESTALE;
1132         }
1133         if (state->n_rdonly != 0) {
1134                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1135                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1136                 if (ret != 0)
1137                         return ret;
1138                 if (newstate != state)
1139                         return -ESTALE;
1140         }
1141         /*
1142          * We may have performed cached opens for all three recoveries.
1143          * Check if we need to update the current stateid.
1144          */
1145         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1146             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1147                 write_seqlock(&state->seqlock);
1148                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1149                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1150                 write_sequnlock(&state->seqlock);
1151         }
1152         return 0;
1153 }
1154
1155 /*
1156  * OPEN_RECLAIM:
1157  *      reclaim state on the server after a reboot.
1158  */
1159 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1160 {
1161         struct nfs_delegation *delegation;
1162         struct nfs4_opendata *opendata;
1163         fmode_t delegation_type = 0;
1164         int status;
1165
1166         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1167         if (IS_ERR(opendata))
1168                 return PTR_ERR(opendata);
1169         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1170         opendata->o_arg.fh = NFS_FH(state->inode);
1171         rcu_read_lock();
1172         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1173         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1174                 delegation_type = delegation->type;
1175         rcu_read_unlock();
1176         opendata->o_arg.u.delegation_type = delegation_type;
1177         status = nfs4_open_recover(opendata, state);
1178         nfs4_opendata_put(opendata);
1179         return status;
1180 }
1181
1182 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1183 {
1184         struct nfs_server *server = NFS_SERVER(state->inode);
1185         struct nfs4_exception exception = { };
1186         int err;
1187         do {
1188                 err = _nfs4_do_open_reclaim(ctx, state);
1189                 if (err != -NFS4ERR_DELAY)
1190                         break;
1191                 nfs4_handle_exception(server, err, &exception);
1192         } while (exception.retry);
1193         return err;
1194 }
1195
1196 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1197 {
1198         struct nfs_open_context *ctx;
1199         int ret;
1200
1201         ctx = nfs4_state_find_open_context(state);
1202         if (IS_ERR(ctx))
1203                 return PTR_ERR(ctx);
1204         ret = nfs4_do_open_reclaim(ctx, state);
1205         put_nfs_open_context(ctx);
1206         return ret;
1207 }
1208
1209 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1210 {
1211         struct nfs4_opendata *opendata;
1212         int ret;
1213
1214         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1215         if (IS_ERR(opendata))
1216                 return PTR_ERR(opendata);
1217         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1218         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1219                         sizeof(opendata->o_arg.u.delegation.data));
1220         ret = nfs4_open_recover(opendata, state);
1221         nfs4_opendata_put(opendata);
1222         return ret;
1223 }
1224
1225 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1226 {
1227         struct nfs4_exception exception = { };
1228         struct nfs_server *server = NFS_SERVER(state->inode);
1229         int err;
1230         do {
1231                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1232                 switch (err) {
1233                         case 0:
1234                         case -ENOENT:
1235                         case -ESTALE:
1236                                 goto out;
1237                         case -NFS4ERR_BADSESSION:
1238                         case -NFS4ERR_BADSLOT:
1239                         case -NFS4ERR_BAD_HIGH_SLOT:
1240                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1241                         case -NFS4ERR_DEADSESSION:
1242                                 nfs4_schedule_state_recovery(
1243                                         server->nfs_client);
1244                                 goto out;
1245                         case -NFS4ERR_STALE_CLIENTID:
1246                         case -NFS4ERR_STALE_STATEID:
1247                         case -NFS4ERR_EXPIRED:
1248                                 /* Don't recall a delegation if it was lost */
1249                                 nfs4_schedule_state_recovery(server->nfs_client);
1250                                 goto out;
1251                         case -ERESTARTSYS:
1252                                 /*
1253                                  * The show must go on: exit, but mark the
1254                                  * stateid as needing recovery.
1255                                  */
1256                         case -NFS4ERR_ADMIN_REVOKED:
1257                         case -NFS4ERR_BAD_STATEID:
1258                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1259                         case -EKEYEXPIRED:
1260                                 /*
1261                                  * User RPCSEC_GSS context has expired.
1262                                  * We cannot recover this stateid now, so
1263                                  * skip it and allow recovery thread to
1264                                  * proceed.
1265                                  */
1266                         case -ENOMEM:
1267                                 err = 0;
1268                                 goto out;
1269                 }
1270                 err = nfs4_handle_exception(server, err, &exception);
1271         } while (exception.retry);
1272 out:
1273         return err;
1274 }
1275
1276 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1277 {
1278         struct nfs4_opendata *data = calldata;
1279
1280         data->rpc_status = task->tk_status;
1281         if (data->rpc_status == 0) {
1282                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1283                                 sizeof(data->o_res.stateid.data));
1284                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1285                 renew_lease(data->o_res.server, data->timestamp);
1286                 data->rpc_done = 1;
1287         }
1288 }
1289
1290 static void nfs4_open_confirm_release(void *calldata)
1291 {
1292         struct nfs4_opendata *data = calldata;
1293         struct nfs4_state *state = NULL;
1294
1295         /* If this request hasn't been cancelled, do nothing */
1296         if (data->cancelled == 0)
1297                 goto out_free;
1298         /* In case of error, no cleanup! */
1299         if (!data->rpc_done)
1300                 goto out_free;
1301         state = nfs4_opendata_to_nfs4_state(data);
1302         if (!IS_ERR(state))
1303                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1304 out_free:
1305         nfs4_opendata_put(data);
1306 }
1307
1308 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1309         .rpc_call_done = nfs4_open_confirm_done,
1310         .rpc_release = nfs4_open_confirm_release,
1311 };
1312
1313 /*
1314  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1315  */
1316 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1317 {
1318         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1319         struct rpc_task *task;
1320         struct  rpc_message msg = {
1321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1322                 .rpc_argp = &data->c_arg,
1323                 .rpc_resp = &data->c_res,
1324                 .rpc_cred = data->owner->so_cred,
1325         };
1326         struct rpc_task_setup task_setup_data = {
1327                 .rpc_client = server->client,
1328                 .rpc_message = &msg,
1329                 .callback_ops = &nfs4_open_confirm_ops,
1330                 .callback_data = data,
1331                 .workqueue = nfsiod_workqueue,
1332                 .flags = RPC_TASK_ASYNC,
1333         };
1334         int status;
1335
1336         kref_get(&data->kref);
1337         data->rpc_done = 0;
1338         data->rpc_status = 0;
1339         data->timestamp = jiffies;
1340         task = rpc_run_task(&task_setup_data);
1341         if (IS_ERR(task))
1342                 return PTR_ERR(task);
1343         status = nfs4_wait_for_completion_rpc_task(task);
1344         if (status != 0) {
1345                 data->cancelled = 1;
1346                 smp_wmb();
1347         } else
1348                 status = data->rpc_status;
1349         rpc_put_task(task);
1350         return status;
1351 }
1352
1353 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1354 {
1355         struct nfs4_opendata *data = calldata;
1356         struct nfs4_state_owner *sp = data->owner;
1357
1358         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1359                 return;
1360         /*
1361          * Check if we still need to send an OPEN call, or if we can use
1362          * a delegation instead.
1363          */
1364         if (data->state != NULL) {
1365                 struct nfs_delegation *delegation;
1366
1367                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1368                         goto out_no_action;
1369                 rcu_read_lock();
1370                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1371                 if (delegation != NULL &&
1372                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1373                         rcu_read_unlock();
1374                         goto out_no_action;
1375                 }
1376                 rcu_read_unlock();
1377         }
1378         /* Update sequence id. */
1379         data->o_arg.id = sp->so_owner_id.id;
1380         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1381         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1382                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1383                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1384         }
1385         data->timestamp = jiffies;
1386         if (nfs4_setup_sequence(data->o_arg.server,
1387                                 &data->o_arg.seq_args,
1388                                 &data->o_res.seq_res, 1, task))
1389                 return;
1390         rpc_call_start(task);
1391         return;
1392 out_no_action:
1393         task->tk_action = NULL;
1394
1395 }
1396
1397 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1398 {
1399         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1400         nfs4_open_prepare(task, calldata);
1401 }
1402
1403 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1404 {
1405         struct nfs4_opendata *data = calldata;
1406
1407         data->rpc_status = task->tk_status;
1408
1409         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1410                 return;
1411
1412         if (task->tk_status == 0) {
1413                 switch (data->o_res.f_attr->mode & S_IFMT) {
1414                         case S_IFREG:
1415                                 break;
1416                         case S_IFLNK:
1417                                 data->rpc_status = -ELOOP;
1418                                 break;
1419                         case S_IFDIR:
1420                                 data->rpc_status = -EISDIR;
1421                                 break;
1422                         default:
1423                                 data->rpc_status = -ENOTDIR;
1424                 }
1425                 renew_lease(data->o_res.server, data->timestamp);
1426                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1427                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1428         }
1429         data->rpc_done = 1;
1430 }
1431
1432 static void nfs4_open_release(void *calldata)
1433 {
1434         struct nfs4_opendata *data = calldata;
1435         struct nfs4_state *state = NULL;
1436
1437         /* If this request hasn't been cancelled, do nothing */
1438         if (data->cancelled == 0)
1439                 goto out_free;
1440         /* In case of error, no cleanup! */
1441         if (data->rpc_status != 0 || !data->rpc_done)
1442                 goto out_free;
1443         /* In case we need an open_confirm, no cleanup! */
1444         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1445                 goto out_free;
1446         state = nfs4_opendata_to_nfs4_state(data);
1447         if (!IS_ERR(state))
1448                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1449 out_free:
1450         nfs4_opendata_put(data);
1451 }
1452
1453 static const struct rpc_call_ops nfs4_open_ops = {
1454         .rpc_call_prepare = nfs4_open_prepare,
1455         .rpc_call_done = nfs4_open_done,
1456         .rpc_release = nfs4_open_release,
1457 };
1458
1459 static const struct rpc_call_ops nfs4_recover_open_ops = {
1460         .rpc_call_prepare = nfs4_recover_open_prepare,
1461         .rpc_call_done = nfs4_open_done,
1462         .rpc_release = nfs4_open_release,
1463 };
1464
1465 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1466 {
1467         struct inode *dir = data->dir->d_inode;
1468         struct nfs_server *server = NFS_SERVER(dir);
1469         struct nfs_openargs *o_arg = &data->o_arg;
1470         struct nfs_openres *o_res = &data->o_res;
1471         struct rpc_task *task;
1472         struct rpc_message msg = {
1473                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1474                 .rpc_argp = o_arg,
1475                 .rpc_resp = o_res,
1476                 .rpc_cred = data->owner->so_cred,
1477         };
1478         struct rpc_task_setup task_setup_data = {
1479                 .rpc_client = server->client,
1480                 .rpc_message = &msg,
1481                 .callback_ops = &nfs4_open_ops,
1482                 .callback_data = data,
1483                 .workqueue = nfsiod_workqueue,
1484                 .flags = RPC_TASK_ASYNC,
1485         };
1486         int status;
1487
1488         kref_get(&data->kref);
1489         data->rpc_done = 0;
1490         data->rpc_status = 0;
1491         data->cancelled = 0;
1492         if (isrecover)
1493                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1494         task = rpc_run_task(&task_setup_data);
1495         if (IS_ERR(task))
1496                 return PTR_ERR(task);
1497         status = nfs4_wait_for_completion_rpc_task(task);
1498         if (status != 0) {
1499                 data->cancelled = 1;
1500                 smp_wmb();
1501         } else
1502                 status = data->rpc_status;
1503         rpc_put_task(task);
1504
1505         return status;
1506 }
1507
1508 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1509 {
1510         struct inode *dir = data->dir->d_inode;
1511         struct nfs_openres *o_res = &data->o_res;
1512         int status;
1513
1514         status = nfs4_run_open_task(data, 1);
1515         if (status != 0 || !data->rpc_done)
1516                 return status;
1517
1518         nfs_refresh_inode(dir, o_res->dir_attr);
1519
1520         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1521                 status = _nfs4_proc_open_confirm(data);
1522                 if (status != 0)
1523                         return status;
1524         }
1525
1526         return status;
1527 }
1528
1529 /*
1530  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1531  */
1532 static int _nfs4_proc_open(struct nfs4_opendata *data)
1533 {
1534         struct inode *dir = data->dir->d_inode;
1535         struct nfs_server *server = NFS_SERVER(dir);
1536         struct nfs_openargs *o_arg = &data->o_arg;
1537         struct nfs_openres *o_res = &data->o_res;
1538         int status;
1539
1540         status = nfs4_run_open_task(data, 0);
1541         if (status != 0 || !data->rpc_done)
1542                 return status;
1543
1544         if (o_arg->open_flags & O_CREAT) {
1545                 update_changeattr(dir, &o_res->cinfo);
1546                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1547         } else
1548                 nfs_refresh_inode(dir, o_res->dir_attr);
1549         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1550                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1551         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1552                 status = _nfs4_proc_open_confirm(data);
1553                 if (status != 0)
1554                         return status;
1555         }
1556         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1557                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1558         return 0;
1559 }
1560
1561 static int nfs4_recover_expired_lease(struct nfs_server *server)
1562 {
1563         struct nfs_client *clp = server->nfs_client;
1564         unsigned int loop;
1565         int ret;
1566
1567         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1568                 ret = nfs4_wait_clnt_recover(clp);
1569                 if (ret != 0)
1570                         break;
1571                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1572                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1573                         break;
1574                 nfs4_schedule_state_recovery(clp);
1575                 ret = -EIO;
1576         }
1577         return ret;
1578 }
1579
1580 /*
1581  * OPEN_EXPIRED:
1582  *      reclaim state on the server after a network partition.
1583  *      Assumes caller holds the appropriate lock
1584  */
1585 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1586 {
1587         struct nfs4_opendata *opendata;
1588         int ret;
1589
1590         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1591         if (IS_ERR(opendata))
1592                 return PTR_ERR(opendata);
1593         ret = nfs4_open_recover(opendata, state);
1594         if (ret == -ESTALE)
1595                 d_drop(ctx->path.dentry);
1596         nfs4_opendata_put(opendata);
1597         return ret;
1598 }
1599
1600 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1601 {
1602         struct nfs_server *server = NFS_SERVER(state->inode);
1603         struct nfs4_exception exception = { };
1604         int err;
1605
1606         do {
1607                 err = _nfs4_open_expired(ctx, state);
1608                 switch (err) {
1609                 default:
1610                         goto out;
1611                 case -NFS4ERR_GRACE:
1612                 case -NFS4ERR_DELAY:
1613                         nfs4_handle_exception(server, err, &exception);
1614                         err = 0;
1615                 }
1616         } while (exception.retry);
1617 out:
1618         return err;
1619 }
1620
1621 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1622 {
1623         struct nfs_open_context *ctx;
1624         int ret;
1625
1626         ctx = nfs4_state_find_open_context(state);
1627         if (IS_ERR(ctx))
1628                 return PTR_ERR(ctx);
1629         ret = nfs4_do_open_expired(ctx, state);
1630         put_nfs_open_context(ctx);
1631         return ret;
1632 }
1633
1634 /*
1635  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1636  * fields corresponding to attributes that were used to store the verifier.
1637  * Make sure we clobber those fields in the later setattr call
1638  */
1639 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1640 {
1641         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1642             !(sattr->ia_valid & ATTR_ATIME_SET))
1643                 sattr->ia_valid |= ATTR_ATIME;
1644
1645         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1646             !(sattr->ia_valid & ATTR_MTIME_SET))
1647                 sattr->ia_valid |= ATTR_MTIME;
1648 }
1649
1650 /*
1651  * Returns a referenced nfs4_state
1652  */
1653 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)
1654 {
1655         struct nfs4_state_owner  *sp;
1656         struct nfs4_state     *state = NULL;
1657         struct nfs_server       *server = NFS_SERVER(dir);
1658         struct nfs4_opendata *opendata;
1659         int status;
1660
1661         /* Protect against reboot recovery conflicts */
1662         status = -ENOMEM;
1663         if (!(sp = nfs4_get_state_owner(server, cred))) {
1664                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1665                 goto out_err;
1666         }
1667         status = nfs4_recover_expired_lease(server);
1668         if (status != 0)
1669                 goto err_put_state_owner;
1670         if (path->dentry->d_inode != NULL)
1671                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1672         status = -ENOMEM;
1673         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1674         if (opendata == NULL)
1675                 goto err_put_state_owner;
1676
1677         if (path->dentry->d_inode != NULL)
1678                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1679
1680         status = _nfs4_proc_open(opendata);
1681         if (status != 0)
1682                 goto err_opendata_put;
1683
1684         state = nfs4_opendata_to_nfs4_state(opendata);
1685         status = PTR_ERR(state);
1686         if (IS_ERR(state))
1687                 goto err_opendata_put;
1688         if (server->caps & NFS_CAP_POSIX_LOCK)
1689                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1690
1691         if (opendata->o_arg.open_flags & O_EXCL) {
1692                 nfs4_exclusive_attrset(opendata, sattr);
1693
1694                 nfs_fattr_init(opendata->o_res.f_attr);
1695                 status = nfs4_do_setattr(state->inode, cred,
1696                                 opendata->o_res.f_attr, sattr,
1697                                 state);
1698                 if (status == 0)
1699                         nfs_setattr_update_inode(state->inode, sattr);
1700                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1701         }
1702         nfs4_opendata_put(opendata);
1703         nfs4_put_state_owner(sp);
1704         *res = state;
1705         return 0;
1706 err_opendata_put:
1707         nfs4_opendata_put(opendata);
1708 err_put_state_owner:
1709         nfs4_put_state_owner(sp);
1710 out_err:
1711         *res = NULL;
1712         return status;
1713 }
1714
1715
1716 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)
1717 {
1718         struct nfs4_exception exception = { };
1719         struct nfs4_state *res;
1720         int status;
1721
1722         do {
1723                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1724                 if (status == 0)
1725                         break;
1726                 /* NOTE: BAD_SEQID means the server and client disagree about the
1727                  * book-keeping w.r.t. state-changing operations
1728                  * (OPEN/CLOSE/LOCK/LOCKU...)
1729                  * It is actually a sign of a bug on the client or on the server.
1730                  *
1731                  * If we receive a BAD_SEQID error in the particular case of
1732                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1733                  * have unhashed the old state_owner for us, and that we can
1734                  * therefore safely retry using a new one. We should still warn
1735                  * the user though...
1736                  */
1737                 if (status == -NFS4ERR_BAD_SEQID) {
1738                         printk(KERN_WARNING "NFS: v4 server %s "
1739                                         " returned a bad sequence-id error!\n",
1740                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1741                         exception.retry = 1;
1742                         continue;
1743                 }
1744                 /*
1745                  * BAD_STATEID on OPEN means that the server cancelled our
1746                  * state before it received the OPEN_CONFIRM.
1747                  * Recover by retrying the request as per the discussion
1748                  * on Page 181 of RFC3530.
1749                  */
1750                 if (status == -NFS4ERR_BAD_STATEID) {
1751                         exception.retry = 1;
1752                         continue;
1753                 }
1754                 if (status == -EAGAIN) {
1755                         /* We must have found a delegation */
1756                         exception.retry = 1;
1757                         continue;
1758                 }
1759                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1760                                         status, &exception));
1761         } while (exception.retry);
1762         return res;
1763 }
1764
1765 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1766                             struct nfs_fattr *fattr, struct iattr *sattr,
1767                             struct nfs4_state *state)
1768 {
1769         struct nfs_server *server = NFS_SERVER(inode);
1770         struct nfs_setattrargs  arg = {
1771                 .fh             = NFS_FH(inode),
1772                 .iap            = sattr,
1773                 .server         = server,
1774                 .bitmask = server->attr_bitmask,
1775         };
1776         struct nfs_setattrres  res = {
1777                 .fattr          = fattr,
1778                 .server         = server,
1779         };
1780         struct rpc_message msg = {
1781                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1782                 .rpc_argp       = &arg,
1783                 .rpc_resp       = &res,
1784                 .rpc_cred       = cred,
1785         };
1786         unsigned long timestamp = jiffies;
1787         int status;
1788
1789         nfs_fattr_init(fattr);
1790
1791         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1792                 /* Use that stateid */
1793         } else if (state != NULL) {
1794                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1795         } else
1796                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1797
1798         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1799         if (status == 0 && state != NULL)
1800                 renew_lease(server, timestamp);
1801         return status;
1802 }
1803
1804 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1805                            struct nfs_fattr *fattr, struct iattr *sattr,
1806                            struct nfs4_state *state)
1807 {
1808         struct nfs_server *server = NFS_SERVER(inode);
1809         struct nfs4_exception exception = { };
1810         int err;
1811         do {
1812                 err = nfs4_handle_exception(server,
1813                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1814                                 &exception);
1815         } while (exception.retry);
1816         return err;
1817 }
1818
1819 struct nfs4_closedata {
1820         struct path path;
1821         struct inode *inode;
1822         struct nfs4_state *state;
1823         struct nfs_closeargs arg;
1824         struct nfs_closeres res;
1825         struct nfs_fattr fattr;
1826         unsigned long timestamp;
1827 };
1828
1829 static void nfs4_free_closedata(void *data)
1830 {
1831         struct nfs4_closedata *calldata = data;
1832         struct nfs4_state_owner *sp = calldata->state->owner;
1833
1834         nfs4_put_open_state(calldata->state);
1835         nfs_free_seqid(calldata->arg.seqid);
1836         nfs4_put_state_owner(sp);
1837         path_put(&calldata->path);
1838         kfree(calldata);
1839 }
1840
1841 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1842                 fmode_t fmode)
1843 {
1844         spin_lock(&state->owner->so_lock);
1845         if (!(fmode & FMODE_READ))
1846                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1847         if (!(fmode & FMODE_WRITE))
1848                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1849         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1850         spin_unlock(&state->owner->so_lock);
1851 }
1852
1853 static void nfs4_close_done(struct rpc_task *task, void *data)
1854 {
1855         struct nfs4_closedata *calldata = data;
1856         struct nfs4_state *state = calldata->state;
1857         struct nfs_server *server = NFS_SERVER(calldata->inode);
1858
1859         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1860                 return;
1861         /* hmm. we are done with the inode, and in the process of freeing
1862          * the state_owner. we keep this around to process errors
1863          */
1864         switch (task->tk_status) {
1865                 case 0:
1866                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1867                         renew_lease(server, calldata->timestamp);
1868                         nfs4_close_clear_stateid_flags(state,
1869                                         calldata->arg.fmode);
1870                         break;
1871                 case -NFS4ERR_STALE_STATEID:
1872                 case -NFS4ERR_OLD_STATEID:
1873                 case -NFS4ERR_BAD_STATEID:
1874                 case -NFS4ERR_EXPIRED:
1875                         if (calldata->arg.fmode == 0)
1876                                 break;
1877                 default:
1878                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1879                                 rpc_restart_call_prepare(task);
1880         }
1881         nfs_release_seqid(calldata->arg.seqid);
1882         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1883 }
1884
1885 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1886 {
1887         struct nfs4_closedata *calldata = data;
1888         struct nfs4_state *state = calldata->state;
1889         int call_close = 0;
1890
1891         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1892                 return;
1893
1894         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1895         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1896         spin_lock(&state->owner->so_lock);
1897         /* Calculate the change in open mode */
1898         if (state->n_rdwr == 0) {
1899                 if (state->n_rdonly == 0) {
1900                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1901                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1902                         calldata->arg.fmode &= ~FMODE_READ;
1903                 }
1904                 if (state->n_wronly == 0) {
1905                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1906                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1907                         calldata->arg.fmode &= ~FMODE_WRITE;
1908                 }
1909         }
1910         spin_unlock(&state->owner->so_lock);
1911
1912         if (!call_close) {
1913                 /* Note: exit _without_ calling nfs4_close_done */
1914                 task->tk_action = NULL;
1915                 return;
1916         }
1917
1918         if (calldata->arg.fmode == 0)
1919                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1920
1921         nfs_fattr_init(calldata->res.fattr);
1922         calldata->timestamp = jiffies;
1923         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1924                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1925                                 1, task))
1926                 return;
1927         rpc_call_start(task);
1928 }
1929
1930 static const struct rpc_call_ops nfs4_close_ops = {
1931         .rpc_call_prepare = nfs4_close_prepare,
1932         .rpc_call_done = nfs4_close_done,
1933         .rpc_release = nfs4_free_closedata,
1934 };
1935
1936 /*
1937  * It is possible for data to be read/written from a mem-mapped file
1938  * after the sys_close call (which hits the vfs layer as a flush).
1939  * This means that we can't safely call nfsv4 close on a file until
1940  * the inode is cleared. This in turn means that we are not good
1941  * NFSv4 citizens - we do not indicate to the server to update the file's
1942  * share state even when we are done with one of the three share
1943  * stateid's in the inode.
1944  *
1945  * NOTE: Caller must be holding the sp->so_owner semaphore!
1946  */
1947 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1948 {
1949         struct nfs_server *server = NFS_SERVER(state->inode);
1950         struct nfs4_closedata *calldata;
1951         struct nfs4_state_owner *sp = state->owner;
1952         struct rpc_task *task;
1953         struct rpc_message msg = {
1954                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1955                 .rpc_cred = state->owner->so_cred,
1956         };
1957         struct rpc_task_setup task_setup_data = {
1958                 .rpc_client = server->client,
1959                 .rpc_message = &msg,
1960                 .callback_ops = &nfs4_close_ops,
1961                 .workqueue = nfsiod_workqueue,
1962                 .flags = RPC_TASK_ASYNC,
1963         };
1964         int status = -ENOMEM;
1965
1966         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1967         if (calldata == NULL)
1968                 goto out;
1969         calldata->inode = state->inode;
1970         calldata->state = state;
1971         calldata->arg.fh = NFS_FH(state->inode);
1972         calldata->arg.stateid = &state->open_stateid;
1973         /* Serialization for the sequence id */
1974         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1975         if (calldata->arg.seqid == NULL)
1976                 goto out_free_calldata;
1977         calldata->arg.fmode = 0;
1978         calldata->arg.bitmask = server->cache_consistency_bitmask;
1979         calldata->res.fattr = &calldata->fattr;
1980         calldata->res.seqid = calldata->arg.seqid;
1981         calldata->res.server = server;
1982         path_get(path);
1983         calldata->path = *path;
1984
1985         msg.rpc_argp = &calldata->arg,
1986         msg.rpc_resp = &calldata->res,
1987         task_setup_data.callback_data = calldata;
1988         task = rpc_run_task(&task_setup_data);
1989         if (IS_ERR(task))
1990                 return PTR_ERR(task);
1991         status = 0;
1992         if (wait)
1993                 status = rpc_wait_for_completion_task(task);
1994         rpc_put_task(task);
1995         return status;
1996 out_free_calldata:
1997         kfree(calldata);
1998 out:
1999         nfs4_put_open_state(state);
2000         nfs4_put_state_owner(sp);
2001         return status;
2002 }
2003
2004 static struct inode *
2005 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2006 {
2007         struct nfs4_state *state;
2008
2009         /* Protect against concurrent sillydeletes */
2010         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2011         if (IS_ERR(state))
2012                 return ERR_CAST(state);
2013         ctx->state = state;
2014         return igrab(state->inode);
2015 }
2016
2017 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2018 {
2019         if (ctx->state == NULL)
2020                 return;
2021         if (is_sync)
2022                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2023         else
2024                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2025 }
2026
2027 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2028 {
2029         struct nfs4_server_caps_arg args = {
2030                 .fhandle = fhandle,
2031         };
2032         struct nfs4_server_caps_res res = {};
2033         struct rpc_message msg = {
2034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2035                 .rpc_argp = &args,
2036                 .rpc_resp = &res,
2037         };
2038         int status;
2039
2040         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2041         if (status == 0) {
2042                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2043                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2044                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2045                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2046                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2047                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2048                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2049                         server->caps |= NFS_CAP_ACLS;
2050                 if (res.has_links != 0)
2051                         server->caps |= NFS_CAP_HARDLINKS;
2052                 if (res.has_symlinks != 0)
2053                         server->caps |= NFS_CAP_SYMLINKS;
2054                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2055                         server->caps |= NFS_CAP_FILEID;
2056                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2057                         server->caps |= NFS_CAP_MODE;
2058                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2059                         server->caps |= NFS_CAP_NLINK;
2060                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2061                         server->caps |= NFS_CAP_OWNER;
2062                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2063                         server->caps |= NFS_CAP_OWNER_GROUP;
2064                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2065                         server->caps |= NFS_CAP_ATIME;
2066                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2067                         server->caps |= NFS_CAP_CTIME;
2068                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2069                         server->caps |= NFS_CAP_MTIME;
2070
2071                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2072                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2073                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2074                 server->acl_bitmask = res.acl_bitmask;
2075         }
2076
2077         return status;
2078 }
2079
2080 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2081 {
2082         struct nfs4_exception exception = { };
2083         int err;
2084         do {
2085                 err = nfs4_handle_exception(server,
2086                                 _nfs4_server_capabilities(server, fhandle),
2087                                 &exception);
2088         } while (exception.retry);
2089         return err;
2090 }
2091
2092 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2093                 struct nfs_fsinfo *info)
2094 {
2095         struct nfs4_lookup_root_arg args = {
2096                 .bitmask = nfs4_fattr_bitmap,
2097         };
2098         struct nfs4_lookup_res res = {
2099                 .server = server,
2100                 .fattr = info->fattr,
2101                 .fh = fhandle,
2102         };
2103         struct rpc_message msg = {
2104                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2105                 .rpc_argp = &args,
2106                 .rpc_resp = &res,
2107         };
2108
2109         nfs_fattr_init(info->fattr);
2110         return nfs4_call_sync(server, &msg, &args, &res, 0);
2111 }
2112
2113 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2114                 struct nfs_fsinfo *info)
2115 {
2116         struct nfs4_exception exception = { };
2117         int err;
2118         do {
2119                 err = nfs4_handle_exception(server,
2120                                 _nfs4_lookup_root(server, fhandle, info),
2121                                 &exception);
2122         } while (exception.retry);
2123         return err;
2124 }
2125
2126 /*
2127  * get the file handle for the "/" directory on the server
2128  */
2129 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2130                               struct nfs_fsinfo *info)
2131 {
2132         int status;
2133
2134         status = nfs4_lookup_root(server, fhandle, info);
2135         if (status == 0)
2136                 status = nfs4_server_capabilities(server, fhandle);
2137         if (status == 0)
2138                 status = nfs4_do_fsinfo(server, fhandle, info);
2139         return nfs4_map_errors(status);
2140 }
2141
2142 /*
2143  * Get locations and (maybe) other attributes of a referral.
2144  * Note that we'll actually follow the referral later when
2145  * we detect fsid mismatch in inode revalidation
2146  */
2147 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2148 {
2149         int status = -ENOMEM;
2150         struct page *page = NULL;
2151         struct nfs4_fs_locations *locations = NULL;
2152
2153         page = alloc_page(GFP_KERNEL);
2154         if (page == NULL)
2155                 goto out;
2156         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2157         if (locations == NULL)
2158                 goto out;
2159
2160         status = nfs4_proc_fs_locations(dir, name, locations, page);
2161         if (status != 0)
2162                 goto out;
2163         /* Make sure server returned a different fsid for the referral */
2164         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2165                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2166                 status = -EIO;
2167                 goto out;
2168         }
2169
2170         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2171         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2172         if (!fattr->mode)
2173                 fattr->mode = S_IFDIR;
2174         memset(fhandle, 0, sizeof(struct nfs_fh));
2175 out:
2176         if (page)
2177                 __free_page(page);
2178         kfree(locations);
2179         return status;
2180 }
2181
2182 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2183 {
2184         struct nfs4_getattr_arg args = {
2185                 .fh = fhandle,
2186                 .bitmask = server->attr_bitmask,
2187         };
2188         struct nfs4_getattr_res res = {
2189                 .fattr = fattr,
2190                 .server = server,
2191         };
2192         struct rpc_message msg = {
2193                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2194                 .rpc_argp = &args,
2195                 .rpc_resp = &res,
2196         };
2197
2198         nfs_fattr_init(fattr);
2199         return nfs4_call_sync(server, &msg, &args, &res, 0);
2200 }
2201
2202 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2203 {
2204         struct nfs4_exception exception = { };
2205         int err;
2206         do {
2207                 err = nfs4_handle_exception(server,
2208                                 _nfs4_proc_getattr(server, fhandle, fattr),
2209                                 &exception);
2210         } while (exception.retry);
2211         return err;
2212 }
2213
2214 /*
2215  * The file is not closed if it is opened due to the a request to change
2216  * the size of the file. The open call will not be needed once the
2217  * VFS layer lookup-intents are implemented.
2218  *
2219  * Close is called when the inode is destroyed.
2220  * If we haven't opened the file for O_WRONLY, we
2221  * need to in the size_change case to obtain a stateid.
2222  *
2223  * Got race?
2224  * Because OPEN is always done by name in nfsv4, it is
2225  * possible that we opened a different file by the same
2226  * name.  We can recognize this race condition, but we
2227  * can't do anything about it besides returning an error.
2228  *
2229  * This will be fixed with VFS changes (lookup-intent).
2230  */
2231 static int
2232 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2233                   struct iattr *sattr)
2234 {
2235         struct inode *inode = dentry->d_inode;
2236         struct rpc_cred *cred = NULL;
2237         struct nfs4_state *state = NULL;
2238         int status;
2239
2240         nfs_fattr_init(fattr);
2241
2242         /* Search for an existing open(O_WRITE) file */
2243         if (sattr->ia_valid & ATTR_FILE) {
2244                 struct nfs_open_context *ctx;
2245
2246                 ctx = nfs_file_open_context(sattr->ia_file);
2247                 if (ctx) {
2248                         cred = ctx->cred;
2249                         state = ctx->state;
2250                 }
2251         }
2252
2253         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2254         if (status == 0)
2255                 nfs_setattr_update_inode(inode, sattr);
2256         return status;
2257 }
2258
2259 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2260                 const struct qstr *name, struct nfs_fh *fhandle,
2261                 struct nfs_fattr *fattr)
2262 {
2263         int                    status;
2264         struct nfs4_lookup_arg args = {
2265                 .bitmask = server->attr_bitmask,
2266                 .dir_fh = dirfh,
2267                 .name = name,
2268         };
2269         struct nfs4_lookup_res res = {
2270                 .server = server,
2271                 .fattr = fattr,
2272                 .fh = fhandle,
2273         };
2274         struct rpc_message msg = {
2275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2276                 .rpc_argp = &args,
2277                 .rpc_resp = &res,
2278         };
2279
2280         nfs_fattr_init(fattr);
2281
2282         dprintk("NFS call  lookupfh %s\n", name->name);
2283         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2284         dprintk("NFS reply lookupfh: %d\n", status);
2285         return status;
2286 }
2287
2288 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2289                               struct qstr *name, struct nfs_fh *fhandle,
2290                               struct nfs_fattr *fattr)
2291 {
2292         struct nfs4_exception exception = { };
2293         int err;
2294         do {
2295                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2296                 /* FIXME: !!!! */
2297                 if (err == -NFS4ERR_MOVED) {
2298                         err = -EREMOTE;
2299                         break;
2300                 }
2301                 err = nfs4_handle_exception(server, err, &exception);
2302         } while (exception.retry);
2303         return err;
2304 }
2305
2306 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2307                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2308 {
2309         int status;
2310
2311         dprintk("NFS call  lookup %s\n", name->name);
2312         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2313         if (status == -NFS4ERR_MOVED)
2314                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2315         dprintk("NFS reply lookup: %d\n", status);
2316         return status;
2317 }
2318
2319 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2320 {
2321         struct nfs4_exception exception = { };
2322         int err;
2323         do {
2324                 err = nfs4_handle_exception(NFS_SERVER(dir),
2325                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2326                                 &exception);
2327         } while (exception.retry);
2328         return err;
2329 }
2330
2331 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2332 {
2333         struct nfs_server *server = NFS_SERVER(inode);
2334         struct nfs4_accessargs args = {
2335                 .fh = NFS_FH(inode),
2336                 .bitmask = server->attr_bitmask,
2337         };
2338         struct nfs4_accessres res = {
2339                 .server = server,
2340         };
2341         struct rpc_message msg = {
2342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2343                 .rpc_argp = &args,
2344                 .rpc_resp = &res,
2345                 .rpc_cred = entry->cred,
2346         };
2347         int mode = entry->mask;
2348         int status;
2349
2350         /*
2351          * Determine which access bits we want to ask for...
2352          */
2353         if (mode & MAY_READ)
2354                 args.access |= NFS4_ACCESS_READ;
2355         if (S_ISDIR(inode->i_mode)) {
2356                 if (mode & MAY_WRITE)
2357                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2358                 if (mode & MAY_EXEC)
2359                         args.access |= NFS4_ACCESS_LOOKUP;
2360         } else {
2361                 if (mode & MAY_WRITE)
2362                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2363                 if (mode & MAY_EXEC)
2364                         args.access |= NFS4_ACCESS_EXECUTE;
2365         }
2366
2367         res.fattr = nfs_alloc_fattr();
2368         if (res.fattr == NULL)
2369                 return -ENOMEM;
2370
2371         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2372         if (!status) {
2373                 entry->mask = 0;
2374                 if (res.access & NFS4_ACCESS_READ)
2375                         entry->mask |= MAY_READ;
2376                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2377                         entry->mask |= MAY_WRITE;
2378                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2379                         entry->mask |= MAY_EXEC;
2380                 nfs_refresh_inode(inode, res.fattr);
2381         }
2382         nfs_free_fattr(res.fattr);
2383         return status;
2384 }
2385
2386 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2387 {
2388         struct nfs4_exception exception = { };
2389         int err;
2390         do {
2391                 err = nfs4_handle_exception(NFS_SERVER(inode),
2392                                 _nfs4_proc_access(inode, entry),
2393                                 &exception);
2394         } while (exception.retry);
2395         return err;
2396 }
2397
2398 /*
2399  * TODO: For the time being, we don't try to get any attributes
2400  * along with any of the zero-copy operations READ, READDIR,
2401  * READLINK, WRITE.
2402  *
2403  * In the case of the first three, we want to put the GETATTR
2404  * after the read-type operation -- this is because it is hard
2405  * to predict the length of a GETATTR response in v4, and thus
2406  * align the READ data correctly.  This means that the GETATTR
2407  * may end up partially falling into the page cache, and we should
2408  * shift it into the 'tail' of the xdr_buf before processing.
2409  * To do this efficiently, we need to know the total length
2410  * of data received, which doesn't seem to be available outside
2411  * of the RPC layer.
2412  *
2413  * In the case of WRITE, we also want to put the GETATTR after
2414  * the operation -- in this case because we want to make sure
2415  * we get the post-operation mtime and size.  This means that
2416  * we can't use xdr_encode_pages() as written: we need a variant
2417  * of it which would leave room in the 'tail' iovec.
2418  *
2419  * Both of these changes to the XDR layer would in fact be quite
2420  * minor, but I decided to leave them for a subsequent patch.
2421  */
2422 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2423                 unsigned int pgbase, unsigned int pglen)
2424 {
2425         struct nfs4_readlink args = {
2426                 .fh       = NFS_FH(inode),
2427                 .pgbase   = pgbase,
2428                 .pglen    = pglen,
2429                 .pages    = &page,
2430         };
2431         struct nfs4_readlink_res res;
2432         struct rpc_message msg = {
2433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2434                 .rpc_argp = &args,
2435                 .rpc_resp = &res,
2436         };
2437
2438         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2439 }
2440
2441 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2442                 unsigned int pgbase, unsigned int pglen)
2443 {
2444         struct nfs4_exception exception = { };
2445         int err;
2446         do {
2447                 err = nfs4_handle_exception(NFS_SERVER(inode),
2448                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2449                                 &exception);
2450         } while (exception.retry);
2451         return err;
2452 }
2453
2454 /*
2455  * Got race?
2456  * We will need to arrange for the VFS layer to provide an atomic open.
2457  * Until then, this create/open method is prone to inefficiency and race
2458  * conditions due to the lookup, create, and open VFS calls from sys_open()
2459  * placed on the wire.
2460  *
2461  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2462  * The file will be opened again in the subsequent VFS open call
2463  * (nfs4_proc_file_open).
2464  *
2465  * The open for read will just hang around to be used by any process that
2466  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2467  */
2468
2469 static int
2470 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2471                  int flags, struct nfs_open_context *ctx)
2472 {
2473         struct path my_path = {
2474                 .dentry = dentry,
2475         };
2476         struct path *path = &my_path;
2477         struct nfs4_state *state;
2478         struct rpc_cred *cred = NULL;
2479         fmode_t fmode = 0;
2480         int status = 0;
2481
2482         if (ctx != NULL) {
2483                 cred = ctx->cred;
2484                 path = &ctx->path;
2485                 fmode = ctx->mode;
2486         }
2487         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2488         d_drop(dentry);
2489         if (IS_ERR(state)) {
2490                 status = PTR_ERR(state);
2491                 goto out;
2492         }
2493         d_add(dentry, igrab(state->inode));
2494         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2495         if (ctx != NULL)
2496                 ctx->state = state;
2497         else
2498                 nfs4_close_sync(path, state, fmode);
2499 out:
2500         return status;
2501 }
2502
2503 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2504 {
2505         struct nfs_server *server = NFS_SERVER(dir);
2506         struct nfs_removeargs args = {
2507                 .fh = NFS_FH(dir),
2508                 .name.len = name->len,
2509                 .name.name = name->name,
2510                 .bitmask = server->attr_bitmask,
2511         };
2512         struct nfs_removeres res = {
2513                 .server = server,
2514         };
2515         struct rpc_message msg = {
2516                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2517                 .rpc_argp = &args,
2518                 .rpc_resp = &res,
2519         };
2520         int status = -ENOMEM;
2521
2522         res.dir_attr = nfs_alloc_fattr();
2523         if (res.dir_attr == NULL)
2524                 goto out;
2525
2526         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2527         if (status == 0) {
2528                 update_changeattr(dir, &res.cinfo);
2529                 nfs_post_op_update_inode(dir, res.dir_attr);
2530         }
2531         nfs_free_fattr(res.dir_attr);
2532 out:
2533         return status;
2534 }
2535
2536 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2537 {
2538         struct nfs4_exception exception = { };
2539         int err;
2540         do {
2541                 err = nfs4_handle_exception(NFS_SERVER(dir),
2542                                 _nfs4_proc_remove(dir, name),
2543                                 &exception);
2544         } while (exception.retry);
2545         return err;
2546 }
2547
2548 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2549 {
2550         struct nfs_server *server = NFS_SERVER(dir);
2551         struct nfs_removeargs *args = msg->rpc_argp;
2552         struct nfs_removeres *res = msg->rpc_resp;
2553
2554         args->bitmask = server->cache_consistency_bitmask;
2555         res->server = server;
2556         res->seq_res.sr_slot = NULL;
2557         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2558 }
2559
2560 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2561 {
2562         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2563
2564         if (!nfs4_sequence_done(task, &res->seq_res))
2565                 return 0;
2566         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2567                 return 0;
2568         update_changeattr(dir, &res->cinfo);
2569         nfs_post_op_update_inode(dir, res->dir_attr);
2570         return 1;
2571 }
2572
2573 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2574 {
2575         struct nfs_server *server = NFS_SERVER(dir);
2576         struct nfs_renameargs *arg = msg->rpc_argp;
2577         struct nfs_renameres *res = msg->rpc_resp;
2578
2579         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2580         arg->bitmask = server->attr_bitmask;
2581         res->server = server;
2582 }
2583
2584 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2585                                  struct inode *new_dir)
2586 {
2587         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2588
2589         if (!nfs4_sequence_done(task, &res->seq_res))
2590                 return 0;
2591         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2592                 return 0;
2593
2594         update_changeattr(old_dir, &res->old_cinfo);
2595         nfs_post_op_update_inode(old_dir, res->old_fattr);
2596         update_changeattr(new_dir, &res->new_cinfo);
2597         nfs_post_op_update_inode(new_dir, res->new_fattr);
2598         return 1;
2599 }
2600
2601 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2602                 struct inode *new_dir, struct qstr *new_name)
2603 {
2604         struct nfs_server *server = NFS_SERVER(old_dir);
2605         struct nfs_renameargs arg = {
2606                 .old_dir = NFS_FH(old_dir),
2607                 .new_dir = NFS_FH(new_dir),
2608                 .old_name = old_name,
2609                 .new_name = new_name,
2610                 .bitmask = server->attr_bitmask,
2611         };
2612         struct nfs_renameres res = {
2613                 .server = server,
2614         };
2615         struct rpc_message msg = {
2616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2617                 .rpc_argp = &arg,
2618                 .rpc_resp = &res,
2619         };
2620         int status = -ENOMEM;
2621
2622         res.old_fattr = nfs_alloc_fattr();
2623         res.new_fattr = nfs_alloc_fattr();
2624         if (res.old_fattr == NULL || res.new_fattr == NULL)
2625                 goto out;
2626
2627         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2628         if (!status) {
2629                 update_changeattr(old_dir, &res.old_cinfo);
2630                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2631                 update_changeattr(new_dir, &res.new_cinfo);
2632                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2633         }
2634 out:
2635         nfs_free_fattr(res.new_fattr);
2636         nfs_free_fattr(res.old_fattr);
2637         return status;
2638 }
2639
2640 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2641                 struct inode *new_dir, struct qstr *new_name)
2642 {
2643         struct nfs4_exception exception = { };
2644         int err;
2645         do {
2646                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2647                                 _nfs4_proc_rename(old_dir, old_name,
2648                                         new_dir, new_name),
2649                                 &exception);
2650         } while (exception.retry);
2651         return err;
2652 }
2653
2654 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2655 {
2656         struct nfs_server *server = NFS_SERVER(inode);
2657         struct nfs4_link_arg arg = {
2658                 .fh     = NFS_FH(inode),
2659                 .dir_fh = NFS_FH(dir),
2660                 .name   = name,
2661                 .bitmask = server->attr_bitmask,
2662         };
2663         struct nfs4_link_res res = {
2664                 .server = server,
2665         };
2666         struct rpc_message msg = {
2667                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2668                 .rpc_argp = &arg,
2669                 .rpc_resp = &res,
2670         };
2671         int status = -ENOMEM;
2672
2673         res.fattr = nfs_alloc_fattr();
2674         res.dir_attr = nfs_alloc_fattr();
2675         if (res.fattr == NULL || res.dir_attr == NULL)
2676                 goto out;
2677
2678         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2679         if (!status) {
2680                 update_changeattr(dir, &res.cinfo);
2681                 nfs_post_op_update_inode(dir, res.dir_attr);
2682                 nfs_post_op_update_inode(inode, res.fattr);
2683         }
2684 out:
2685         nfs_free_fattr(res.dir_attr);
2686         nfs_free_fattr(res.fattr);
2687         return status;
2688 }
2689
2690 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2691 {
2692         struct nfs4_exception exception = { };
2693         int err;
2694         do {
2695                 err = nfs4_handle_exception(NFS_SERVER(inode),
2696                                 _nfs4_proc_link(inode, dir, name),
2697                                 &exception);
2698         } while (exception.retry);
2699         return err;
2700 }
2701
2702 struct nfs4_createdata {
2703         struct rpc_message msg;
2704         struct nfs4_create_arg arg;
2705         struct nfs4_create_res res;
2706         struct nfs_fh fh;
2707         struct nfs_fattr fattr;
2708         struct nfs_fattr dir_fattr;
2709 };
2710
2711 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2712                 struct qstr *name, struct iattr *sattr, u32 ftype)
2713 {
2714         struct nfs4_createdata *data;
2715
2716         data = kzalloc(sizeof(*data), GFP_KERNEL);
2717         if (data != NULL) {
2718                 struct nfs_server *server = NFS_SERVER(dir);
2719
2720                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2721                 data->msg.rpc_argp = &data->arg;
2722                 data->msg.rpc_resp = &data->res;
2723                 data->arg.dir_fh = NFS_FH(dir);
2724                 data->arg.server = server;
2725                 data->arg.name = name;
2726                 data->arg.attrs = sattr;
2727                 data->arg.ftype = ftype;
2728                 data->arg.bitmask = server->attr_bitmask;
2729                 data->res.server = server;
2730                 data->res.fh = &data->fh;
2731                 data->res.fattr = &data->fattr;
2732                 data->res.dir_fattr = &data->dir_fattr;
2733                 nfs_fattr_init(data->res.fattr);
2734                 nfs_fattr_init(data->res.dir_fattr);
2735         }
2736         return data;
2737 }
2738
2739 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2740 {
2741         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2742                                     &data->arg, &data->res, 1);
2743         if (status == 0) {
2744                 update_changeattr(dir, &data->res.dir_cinfo);
2745                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2746                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2747         }
2748         return status;
2749 }
2750
2751 static void nfs4_free_createdata(struct nfs4_createdata *data)
2752 {
2753         kfree(data);
2754 }
2755
2756 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2757                 struct page *page, unsigned int len, struct iattr *sattr)
2758 {
2759         struct nfs4_createdata *data;
2760         int status = -ENAMETOOLONG;
2761
2762         if (len > NFS4_MAXPATHLEN)
2763                 goto out;
2764
2765         status = -ENOMEM;
2766         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2767         if (data == NULL)
2768                 goto out;
2769
2770         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2771         data->arg.u.symlink.pages = &page;
2772         data->arg.u.symlink.len = len;
2773
2774         status = nfs4_do_create(dir, dentry, data);
2775
2776         nfs4_free_createdata(data);
2777 out:
2778         return status;
2779 }
2780
2781 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2782                 struct page *page, unsigned int len, struct iattr *sattr)
2783 {
2784         struct nfs4_exception exception = { };
2785         int err;
2786         do {
2787                 err = nfs4_handle_exception(NFS_SERVER(dir),
2788                                 _nfs4_proc_symlink(dir, dentry, page,
2789                                                         len, sattr),
2790                                 &exception);
2791         } while (exception.retry);
2792         return err;
2793 }
2794
2795 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2796                 struct iattr *sattr)
2797 {
2798         struct nfs4_createdata *data;
2799         int status = -ENOMEM;
2800
2801         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2802         if (data == NULL)
2803                 goto out;
2804
2805         status = nfs4_do_create(dir, dentry, data);
2806
2807         nfs4_free_createdata(data);
2808 out:
2809         return status;
2810 }
2811
2812 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2813                 struct iattr *sattr)
2814 {
2815         struct nfs4_exception exception = { };
2816         int err;
2817         do {
2818                 err = nfs4_handle_exception(NFS_SERVER(dir),
2819                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2820                                 &exception);
2821         } while (exception.retry);
2822         return err;
2823 }
2824
2825 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2826                   u64 cookie, struct page *page, unsigned int count, int plus)
2827 {
2828         struct inode            *dir = dentry->d_inode;
2829         struct nfs4_readdir_arg args = {
2830                 .fh = NFS_FH(dir),
2831                 .pages = &page,
2832                 .pgbase = 0,
2833                 .count = count,
2834                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2835         };
2836         struct nfs4_readdir_res res;
2837         struct rpc_message msg = {
2838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2839                 .rpc_argp = &args,
2840                 .rpc_resp = &res,
2841                 .rpc_cred = cred,
2842         };
2843         int                     status;
2844
2845         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2846                         dentry->d_parent->d_name.name,
2847                         dentry->d_name.name,
2848                         (unsigned long long)cookie);
2849         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2850         res.pgbase = args.pgbase;
2851         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2852         if (status == 0)
2853                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2854
2855         nfs_invalidate_atime(dir);
2856
2857         dprintk("%s: returns %d\n", __func__, status);
2858         return status;
2859 }
2860
2861 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2862                   u64 cookie, struct page *page, unsigned int count, int plus)
2863 {
2864         struct nfs4_exception exception = { };
2865         int err;
2866         do {
2867                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2868                                 _nfs4_proc_readdir(dentry, cred, cookie,
2869                                         page, count, plus),
2870                                 &exception);
2871         } while (exception.retry);
2872         return err;
2873 }
2874
2875 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2876                 struct iattr *sattr, dev_t rdev)
2877 {
2878         struct nfs4_createdata *data;
2879         int mode = sattr->ia_mode;
2880         int status = -ENOMEM;
2881
2882         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2883         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2884
2885         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2886         if (data == NULL)
2887                 goto out;
2888
2889         if (S_ISFIFO(mode))
2890                 data->arg.ftype = NF4FIFO;
2891         else if (S_ISBLK(mode)) {
2892                 data->arg.ftype = NF4BLK;
2893                 data->arg.u.device.specdata1 = MAJOR(rdev);
2894                 data->arg.u.device.specdata2 = MINOR(rdev);
2895         }
2896         else if (S_ISCHR(mode)) {
2897                 data->arg.ftype = NF4CHR;
2898                 data->arg.u.device.specdata1 = MAJOR(rdev);
2899                 data->arg.u.device.specdata2 = MINOR(rdev);
2900         }
2901
2902         status = nfs4_do_create(dir, dentry, data);
2903
2904         nfs4_free_createdata(data);
2905 out:
2906         return status;
2907 }
2908
2909 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2910                 struct iattr *sattr, dev_t rdev)
2911 {
2912         struct nfs4_exception exception = { };
2913         int err;
2914         do {
2915                 err = nfs4_handle_exception(NFS_SERVER(dir),
2916                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2917                                 &exception);
2918         } while (exception.retry);
2919         return err;
2920 }
2921
2922 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2923                  struct nfs_fsstat *fsstat)
2924 {
2925         struct nfs4_statfs_arg args = {
2926                 .fh = fhandle,
2927                 .bitmask = server->attr_bitmask,
2928         };
2929         struct nfs4_statfs_res res = {
2930                 .fsstat = fsstat,
2931         };
2932         struct rpc_message msg = {
2933                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2934                 .rpc_argp = &args,
2935                 .rpc_resp = &res,
2936         };
2937
2938         nfs_fattr_init(fsstat->fattr);
2939         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2940 }
2941
2942 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2943 {
2944         struct nfs4_exception exception = { };
2945         int err;
2946         do {
2947                 err = nfs4_handle_exception(server,
2948                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2949                                 &exception);
2950         } while (exception.retry);
2951         return err;
2952 }
2953
2954 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2955                 struct nfs_fsinfo *fsinfo)
2956 {
2957         struct nfs4_fsinfo_arg args = {
2958                 .fh = fhandle,
2959                 .bitmask = server->attr_bitmask,
2960         };
2961         struct nfs4_fsinfo_res res = {
2962                 .fsinfo = fsinfo,
2963         };
2964         struct rpc_message msg = {
2965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2966                 .rpc_argp = &args,
2967                 .rpc_resp = &res,
2968         };
2969
2970         return nfs4_call_sync(server, &msg, &args, &res, 0);
2971 }
2972
2973 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2974 {
2975         struct nfs4_exception exception = { };
2976         int err;
2977
2978         do {
2979                 err = nfs4_handle_exception(server,
2980                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2981                                 &exception);
2982         } while (exception.retry);
2983         return err;
2984 }
2985
2986 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2987 {
2988         nfs_fattr_init(fsinfo->fattr);
2989         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2990 }
2991
2992 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2993                 struct nfs_pathconf *pathconf)
2994 {
2995         struct nfs4_pathconf_arg args = {
2996                 .fh = fhandle,
2997                 .bitmask = server->attr_bitmask,
2998         };
2999         struct nfs4_pathconf_res res = {
3000                 .pathconf = pathconf,
3001         };
3002         struct rpc_message msg = {
3003                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3004                 .rpc_argp = &args,
3005                 .rpc_resp = &res,
3006         };
3007
3008         /* None of the pathconf attributes are mandatory to implement */
3009         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3010                 memset(pathconf, 0, sizeof(*pathconf));
3011                 return 0;
3012         }
3013
3014         nfs_fattr_init(pathconf->fattr);
3015         return nfs4_call_sync(server, &msg, &args, &res, 0);
3016 }
3017
3018 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3019                 struct nfs_pathconf *pathconf)
3020 {
3021         struct nfs4_exception exception = { };
3022         int err;
3023
3024         do {
3025                 err = nfs4_handle_exception(server,
3026                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3027                                 &exception);
3028         } while (exception.retry);
3029         return err;
3030 }
3031
3032 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3033 {
3034         struct nfs_server *server = NFS_SERVER(data->inode);
3035
3036         dprintk("--> %s\n", __func__);
3037
3038         if (!nfs4_sequence_done(task, &data->res.seq_res))
3039                 return -EAGAIN;
3040
3041         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3042                 nfs_restart_rpc(task, server->nfs_client);
3043                 return -EAGAIN;
3044         }
3045
3046         nfs_invalidate_atime(data->inode);
3047         if (task->tk_status > 0)
3048                 renew_lease(server, data->timestamp);
3049         return 0;
3050 }
3051
3052 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3053 {
3054         data->timestamp   = jiffies;
3055         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3056 }
3057
3058 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3059 {
3060         struct inode *inode = data->inode;
3061
3062         if (!nfs4_sequence_done(task, &data->res.seq_res))
3063                 return -EAGAIN;
3064
3065         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3066                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3067                 return -EAGAIN;
3068         }
3069         if (task->tk_status >= 0) {
3070                 renew_lease(NFS_SERVER(inode), data->timestamp);
3071                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3072         }
3073         return 0;
3074 }
3075
3076 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3077 {
3078         struct nfs_server *server = NFS_SERVER(data->inode);
3079
3080         data->args.bitmask = server->cache_consistency_bitmask;
3081         data->res.server = server;
3082         data->timestamp   = jiffies;
3083
3084         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3085 }
3086
3087 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3088 {
3089         struct inode *inode = data->inode;
3090
3091         if (!nfs4_sequence_done(task, &data->res.seq_res))
3092                 return -EAGAIN;
3093
3094         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3095                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3096                 return -EAGAIN;
3097         }
3098         nfs_refresh_inode(inode, data->res.fattr);
3099         return 0;
3100 }
3101
3102 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3103 {
3104         struct nfs_server *server = NFS_SERVER(data->inode);
3105
3106         data->args.bitmask = server->cache_consistency_bitmask;
3107         data->res.server = server;
3108         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3109 }
3110
3111 struct nfs4_renewdata {
3112         struct nfs_client       *client;
3113         unsigned long           timestamp;
3114 };
3115
3116 /*
3117  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3118  * standalone procedure for queueing an asynchronous RENEW.
3119  */
3120 static void nfs4_renew_release(void *calldata)
3121 {
3122         struct nfs4_renewdata *data = calldata;
3123         struct nfs_client *clp = data->client;
3124
3125         if (atomic_read(&clp->cl_count) > 1)
3126                 nfs4_schedule_state_renewal(clp);
3127         nfs_put_client(clp);
3128         kfree(data);
3129 }
3130
3131 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3132 {
3133         struct nfs4_renewdata *data = calldata;
3134         struct nfs_client *clp = data->client;
3135         unsigned long timestamp = data->timestamp;
3136
3137         if (task->tk_status < 0) {
3138                 /* Unless we're shutting down, schedule state recovery! */
3139                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3140                         nfs4_schedule_state_recovery(clp);
3141                 return;
3142         }
3143         do_renew_lease(clp, timestamp);
3144 }
3145
3146 static const struct rpc_call_ops nfs4_renew_ops = {
3147         .rpc_call_done = nfs4_renew_done,
3148         .rpc_release = nfs4_renew_release,
3149 };
3150
3151 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3152 {
3153         struct rpc_message msg = {
3154                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3155                 .rpc_argp       = clp,
3156                 .rpc_cred       = cred,
3157         };
3158         struct nfs4_renewdata *data;
3159
3160         if (!atomic_inc_not_zero(&clp->cl_count))
3161                 return -EIO;
3162         data = kmalloc(sizeof(*data), GFP_KERNEL);
3163         if (data == NULL)
3164                 return -ENOMEM;
3165         data->client = clp;
3166         data->timestamp = jiffies;
3167         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3168                         &nfs4_renew_ops, data);
3169 }
3170
3171 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3172 {
3173         struct rpc_message msg = {
3174                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3175                 .rpc_argp       = clp,
3176                 .rpc_cred       = cred,
3177         };
3178         unsigned long now = jiffies;
3179         int status;
3180
3181         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3182         if (status < 0)
3183                 return status;
3184         do_renew_lease(clp, now);
3185         return 0;
3186 }
3187
3188 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3189 {
3190         return (server->caps & NFS_CAP_ACLS)
3191                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3192                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3193 }
3194
3195 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3196  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3197  * the stack.
3198  */
3199 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3200
3201 static void buf_to_pages(const void *buf, size_t buflen,
3202                 struct page **pages, unsigned int *pgbase)
3203 {
3204         const void *p = buf;
3205
3206         *pgbase = offset_in_page(buf);
3207         p -= *pgbase;
3208         while (p < buf + buflen) {
3209                 *(pages++) = virt_to_page(p);
3210                 p += PAGE_CACHE_SIZE;
3211         }
3212 }
3213
3214 struct nfs4_cached_acl {
3215         int cached;
3216         size_t len;
3217         char data[0];
3218 };
3219
3220 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3221 {
3222         struct nfs_inode *nfsi = NFS_I(inode);
3223
3224         spin_lock(&inode->i_lock);
3225         kfree(nfsi->nfs4_acl);
3226         nfsi->nfs4_acl = acl;
3227         spin_unlock(&inode->i_lock);
3228 }
3229
3230 static void nfs4_zap_acl_attr(struct inode *inode)
3231 {
3232         nfs4_set_cached_acl(inode, NULL);
3233 }
3234
3235 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3236 {
3237         struct nfs_inode *nfsi = NFS_I(inode);
3238         struct nfs4_cached_acl *acl;
3239         int ret = -ENOENT;
3240
3241         spin_lock(&inode->i_lock);
3242         acl = nfsi->nfs4_acl;
3243         if (acl == NULL)
3244                 goto out;
3245         if (buf == NULL) /* user is just asking for length */
3246                 goto out_len;
3247         if (acl->cached == 0)
3248                 goto out;
3249         ret = -ERANGE; /* see getxattr(2) man page */
3250         if (acl->len > buflen)
3251                 goto out;
3252         memcpy(buf, acl->data, acl->len);
3253 out_len:
3254         ret = acl->len;
3255 out:
3256         spin_unlock(&inode->i_lock);
3257         return ret;
3258 }
3259
3260 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3261 {
3262         struct nfs4_cached_acl *acl;
3263
3264         if (buf && acl_len <= PAGE_SIZE) {
3265                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3266                 if (acl == NULL)
3267                         goto out;
3268                 acl->cached = 1;
3269                 memcpy(acl->data, buf, acl_len);
3270         } else {
3271                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3272                 if (acl == NULL)
3273                         goto out;
3274                 acl->cached = 0;
3275         }
3276         acl->len = acl_len;
3277 out:
3278         nfs4_set_cached_acl(inode, acl);
3279 }
3280
3281 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3282 {
3283         struct page *pages[NFS4ACL_MAXPAGES];
3284         struct nfs_getaclargs args = {
3285                 .fh = NFS_FH(inode),
3286                 .acl_pages = pages,
3287                 .acl_len = buflen,
3288         };
3289         struct nfs_getaclres res = {
3290                 .acl_len = buflen,
3291         };
3292         void *resp_buf;
3293         struct rpc_message msg = {
3294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3295                 .rpc_argp = &args,
3296                 .rpc_resp = &res,
3297         };
3298         struct page *localpage = NULL;
3299         int ret;
3300
3301         if (buflen < PAGE_SIZE) {
3302                 /* As long as we're doing a round trip to the server anyway,
3303                  * let's be prepared for a page of acl data. */
3304                 localpage = alloc_page(GFP_KERNEL);
3305                 resp_buf = page_address(localpage);
3306                 if (localpage == NULL)
3307                         return -ENOMEM;
3308                 args.acl_pages[0] = localpage;
3309                 args.acl_pgbase = 0;
3310                 args.acl_len = PAGE_SIZE;
3311         } else {
3312                 resp_buf = buf;
3313                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3314         }
3315         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3316         if (ret)
3317                 goto out_free;
3318         if (res.acl_len > args.acl_len)
3319                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3320         else
3321                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3322         if (buf) {
3323                 ret = -ERANGE;
3324                 if (res.acl_len > buflen)
3325                         goto out_free;
3326                 if (localpage)
3327                         memcpy(buf, resp_buf, res.acl_len);
3328         }
3329         ret = res.acl_len;
3330 out_free:
3331         if (localpage)
3332                 __free_page(localpage);
3333         return ret;
3334 }
3335
3336 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3337 {
3338         struct nfs4_exception exception = { };
3339         ssize_t ret;
3340         do {
3341                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3342                 if (ret >= 0)
3343                         break;
3344                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3345         } while (exception.retry);
3346         return ret;
3347 }
3348
3349 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3350 {
3351         struct nfs_server *server = NFS_SERVER(inode);
3352         int ret;
3353
3354         if (!nfs4_server_supports_acls(server))
3355                 return -EOPNOTSUPP;
3356         ret = nfs_revalidate_inode(server, inode);
3357         if (ret < 0)
3358                 return ret;
3359         ret = nfs4_read_cached_acl(inode, buf, buflen);
3360         if (ret != -ENOENT)
3361                 return ret;
3362         return nfs4_get_acl_uncached(inode, buf, buflen);
3363 }
3364
3365 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3366 {
3367         struct nfs_server *server = NFS_SERVER(inode);
3368         struct page *pages[NFS4ACL_MAXPAGES];
3369         struct nfs_setaclargs arg = {
3370                 .fh             = NFS_FH(inode),
3371                 .acl_pages      = pages,
3372                 .acl_len        = buflen,
3373         };
3374         struct nfs_setaclres res;
3375         struct rpc_message msg = {
3376                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3377                 .rpc_argp       = &arg,
3378                 .rpc_resp       = &res,
3379         };
3380         int ret;
3381
3382         if (!nfs4_server_supports_acls(server))
3383                 return -EOPNOTSUPP;
3384         nfs_inode_return_delegation(inode);
3385         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3386         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3387         nfs_access_zap_cache(inode);
3388         nfs_zap_acl_cache(inode);
3389         return ret;
3390 }
3391
3392 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3393 {
3394         struct nfs4_exception exception = { };
3395         int err;
3396         do {
3397                 err = nfs4_handle_exception(NFS_SERVER(inode),
3398                                 __nfs4_proc_set_acl(inode, buf, buflen),
3399                                 &exception);
3400         } while (exception.retry);
3401         return err;
3402 }
3403
3404 static int
3405 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3406 {
3407         struct nfs_client *clp = server->nfs_client;
3408
3409         if (task->tk_status >= 0)
3410                 return 0;
3411         switch(task->tk_status) {
3412                 case -NFS4ERR_ADMIN_REVOKED:
3413                 case -NFS4ERR_BAD_STATEID:
3414                 case -NFS4ERR_OPENMODE:
3415                         if (state == NULL)
3416                                 break;
3417                         nfs4_state_mark_reclaim_nograce(clp, state);
3418                         goto do_state_recovery;
3419                 case -NFS4ERR_STALE_STATEID:
3420                 case -NFS4ERR_STALE_CLIENTID:
3421                 case -NFS4ERR_EXPIRED:
3422                         goto do_state_recovery;
3423 #if defined(CONFIG_NFS_V4_1)
3424                 case -NFS4ERR_BADSESSION:
3425                 case -NFS4ERR_BADSLOT:
3426                 case -NFS4ERR_BAD_HIGH_SLOT:
3427                 case -NFS4ERR_DEADSESSION:
3428                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3429                 case -NFS4ERR_SEQ_FALSE_RETRY:
3430                 case -NFS4ERR_SEQ_MISORDERED:
3431                         dprintk("%s ERROR %d, Reset session\n", __func__,
3432                                 task->tk_status);
3433                         nfs4_schedule_state_recovery(clp);
3434                         task->tk_status = 0;
3435                         return -EAGAIN;
3436 #endif /* CONFIG_NFS_V4_1 */
3437                 case -NFS4ERR_DELAY:
3438                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3439                 case -NFS4ERR_GRACE:
3440                 case -EKEYEXPIRED:
3441                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3442                         task->tk_status = 0;
3443                         return -EAGAIN;
3444                 case -NFS4ERR_OLD_STATEID:
3445                         task->tk_status = 0;
3446                         return -EAGAIN;
3447         }
3448         task->tk_status = nfs4_map_errors(task->tk_status);
3449         return 0;
3450 do_state_recovery:
3451         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3452         nfs4_schedule_state_recovery(clp);
3453         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3454                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3455         task->tk_status = 0;
3456         return -EAGAIN;
3457 }
3458
3459 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3460                 unsigned short port, struct rpc_cred *cred,
3461                 struct nfs4_setclientid_res *res)
3462 {
3463         nfs4_verifier sc_verifier;
3464         struct nfs4_setclientid setclientid = {
3465                 .sc_verifier = &sc_verifier,
3466                 .sc_prog = program,
3467         };
3468         struct rpc_message msg = {
3469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3470                 .rpc_argp = &setclientid,
3471                 .rpc_resp = res,
3472                 .rpc_cred = cred,
3473         };
3474         __be32 *p;
3475         int loop = 0;
3476         int status;
3477
3478         p = (__be32*)sc_verifier.data;
3479         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3480         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3481
3482         for(;;) {
3483                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3484                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3485                                 clp->cl_ipaddr,
3486                                 rpc_peeraddr2str(clp->cl_rpcclient,
3487                                                         RPC_DISPLAY_ADDR),
3488                                 rpc_peeraddr2str(clp->cl_rpcclient,
3489                                                         RPC_DISPLAY_PROTO),
3490                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3491                                 clp->cl_id_uniquifier);
3492                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3493                                 sizeof(setclientid.sc_netid),
3494                                 rpc_peeraddr2str(clp->cl_rpcclient,
3495                                                         RPC_DISPLAY_NETID));
3496                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3497                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3498                                 clp->cl_ipaddr, port >> 8, port & 255);
3499
3500                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3501                 if (status != -NFS4ERR_CLID_INUSE)
3502                         break;
3503                 if (signalled())
3504                         break;
3505                 if (loop++ & 1)
3506                         ssleep(clp->cl_lease_time + 1);
3507                 else
3508                         if (++clp->cl_id_uniquifier == 0)
3509                                 break;
3510         }
3511         return status;
3512 }
3513
3514 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3515                 struct nfs4_setclientid_res *arg,
3516                 struct rpc_cred *cred)
3517 {
3518         struct nfs_fsinfo fsinfo;
3519         struct rpc_message msg = {
3520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3521                 .rpc_argp = arg,
3522                 .rpc_resp = &fsinfo,
3523                 .rpc_cred = cred,
3524         };
3525         unsigned long now;
3526         int status;
3527
3528         now = jiffies;
3529         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3530         if (status == 0) {
3531                 spin_lock(&clp->cl_lock);
3532                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3533                 clp->cl_last_renewal = now;
3534                 spin_unlock(&clp->cl_lock);
3535         }
3536         return status;
3537 }
3538
3539 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3540                 struct nfs4_setclientid_res *arg,
3541                 struct rpc_cred *cred)
3542 {
3543         long timeout = 0;
3544         int err;
3545         do {
3546                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3547                 switch (err) {
3548                         case 0:
3549                                 return err;
3550                         case -NFS4ERR_RESOURCE:
3551                                 /* The IBM lawyers misread another document! */
3552                         case -NFS4ERR_DELAY:
3553                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3554                 }
3555         } while (err == 0);
3556         return err;
3557 }
3558
3559 struct nfs4_delegreturndata {
3560         struct nfs4_delegreturnargs args;
3561         struct nfs4_delegreturnres res;
3562         struct nfs_fh fh;
3563         nfs4_stateid stateid;
3564         unsigned long timestamp;
3565         struct nfs_fattr fattr;
3566         int rpc_status;
3567 };
3568
3569 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3570 {
3571         struct nfs4_delegreturndata *data = calldata;
3572
3573         if (!nfs4_sequence_done(task, &data->res.seq_res))
3574                 return;
3575
3576         switch (task->tk_status) {
3577         case -NFS4ERR_STALE_STATEID:
3578         case -NFS4ERR_EXPIRED:
3579         case 0:
3580                 renew_lease(data->res.server, data->timestamp);
3581                 break;
3582         default:
3583                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3584                                 -EAGAIN) {
3585                         nfs_restart_rpc(task, data->res.server->nfs_client);
3586                         return;
3587                 }
3588         }
3589         data->rpc_status = task->tk_status;
3590 }
3591
3592 static void nfs4_delegreturn_release(void *calldata)
3593 {
3594         kfree(calldata);
3595 }
3596
3597 #if defined(CONFIG_NFS_V4_1)
3598 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3599 {
3600         struct nfs4_delegreturndata *d_data;
3601
3602         d_data = (struct nfs4_delegreturndata *)data;
3603
3604         if (nfs4_setup_sequence(d_data->res.server,
3605                                 &d_data->args.seq_args,
3606                                 &d_data->res.seq_res, 1, task))
3607                 return;
3608         rpc_call_start(task);
3609 }
3610 #endif /* CONFIG_NFS_V4_1 */
3611
3612 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3613 #if defined(CONFIG_NFS_V4_1)
3614         .rpc_call_prepare = nfs4_delegreturn_prepare,
3615 #endif /* CONFIG_NFS_V4_1 */
3616         .rpc_call_done = nfs4_delegreturn_done,
3617         .rpc_release = nfs4_delegreturn_release,
3618 };
3619
3620 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3621 {
3622         struct nfs4_delegreturndata *data;
3623         struct nfs_server *server = NFS_SERVER(inode);
3624         struct rpc_task *task;
3625         struct rpc_message msg = {
3626                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3627                 .rpc_cred = cred,
3628         };
3629         struct rpc_task_setup task_setup_data = {
3630                 .rpc_client = server->client,
3631                 .rpc_message = &msg,
3632                 .callback_ops = &nfs4_delegreturn_ops,
3633                 .flags = RPC_TASK_ASYNC,
3634         };
3635         int status = 0;
3636
3637         data = kzalloc(sizeof(*data), GFP_NOFS);
3638         if (data == NULL)
3639                 return -ENOMEM;
3640         data->args.fhandle = &data->fh;
3641         data->args.stateid = &data->stateid;
3642         data->args.bitmask = server->attr_bitmask;
3643         nfs_copy_fh(&data->fh, NFS_FH(inode));
3644         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3645         data->res.fattr = &data->fattr;
3646         data->res.server = server;
3647         nfs_fattr_init(data->res.fattr);
3648         data->timestamp = jiffies;
3649         data->rpc_status = 0;
3650
3651         task_setup_data.callback_data = data;
3652         msg.rpc_argp = &data->args,
3653         msg.rpc_resp = &data->res,
3654         task = rpc_run_task(&task_setup_data);
3655         if (IS_ERR(task))
3656                 return PTR_ERR(task);
3657         if (!issync)
3658                 goto out;
3659         status = nfs4_wait_for_completion_rpc_task(task);
3660         if (status != 0)
3661                 goto out;
3662         status = data->rpc_status;
3663         if (status != 0)
3664                 goto out;
3665         nfs_refresh_inode(inode, &data->fattr);
3666 out:
3667         rpc_put_task(task);
3668         return status;
3669 }
3670
3671 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3672 {
3673         struct nfs_server *server = NFS_SERVER(inode);
3674         struct nfs4_exception exception = { };
3675         int err;
3676         do {
3677                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3678                 switch (err) {
3679                         case -NFS4ERR_STALE_STATEID:
3680                         case -NFS4ERR_EXPIRED:
3681                         case 0:
3682                                 return 0;
3683                 }
3684                 err = nfs4_handle_exception(server, err, &exception);
3685         } while (exception.retry);
3686         return err;
3687 }
3688
3689 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3690 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3691
3692 /*
3693  * sleep, with exponential backoff, and retry the LOCK operation.
3694  */
3695 static unsigned long
3696 nfs4_set_lock_task_retry(unsigned long timeout)
3697 {
3698         schedule_timeout_killable(timeout);
3699         timeout <<= 1;
3700         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3701                 return NFS4_LOCK_MAXTIMEOUT;
3702         return timeout;
3703 }
3704
3705 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3706 {
3707         struct inode *inode = state->inode;
3708         struct nfs_server *server = NFS_SERVER(inode);
3709         struct nfs_client *clp = server->nfs_client;
3710         struct nfs_lockt_args arg = {
3711                 .fh = NFS_FH(inode),
3712                 .fl = request,
3713         };
3714         struct nfs_lockt_res res = {
3715                 .denied = request,
3716         };
3717         struct rpc_message msg = {
3718                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3719                 .rpc_argp       = &arg,
3720                 .rpc_resp       = &res,
3721                 .rpc_cred       = state->owner->so_cred,
3722         };
3723         struct nfs4_lock_state *lsp;
3724         int status;
3725
3726         arg.lock_owner.clientid = clp->cl_clientid;
3727         status = nfs4_set_lock_state(state, request);
3728         if (status != 0)
3729                 goto out;
3730         lsp = request->fl_u.nfs4_fl.owner;
3731         arg.lock_owner.id = lsp->ls_id.id;
3732         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3733         switch (status) {
3734                 case 0:
3735                         request->fl_type = F_UNLCK;
3736                         break;
3737                 case -NFS4ERR_DENIED:
3738                         status = 0;
3739         }
3740         request->fl_ops->fl_release_private(request);
3741 out:
3742         return status;
3743 }
3744
3745 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3746 {
3747         struct nfs4_exception exception = { };
3748         int err;
3749
3750         do {
3751                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3752                                 _nfs4_proc_getlk(state, cmd, request),
3753                                 &exception);
3754         } while (exception.retry);
3755         return err;
3756 }
3757
3758 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3759 {
3760         int res = 0;
3761         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3762                 case FL_POSIX:
3763                         res = posix_lock_file_wait(file, fl);
3764                         break;
3765                 case FL_FLOCK:
3766                         res = flock_lock_file_wait(file, fl);
3767                         break;
3768                 default:
3769                         BUG();
3770         }
3771         return res;
3772 }
3773
3774 struct nfs4_unlockdata {
3775         struct nfs_locku_args arg;
3776         struct nfs_locku_res res;
3777         struct nfs4_lock_state *lsp;
3778         struct nfs_open_context *ctx;
3779         struct file_lock fl;
3780         const struct nfs_server *server;
3781         unsigned long timestamp;
3782 };
3783
3784 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3785                 struct nfs_open_context *ctx,
3786                 struct nfs4_lock_state *lsp,
3787                 struct nfs_seqid *seqid)
3788 {
3789         struct nfs4_unlockdata *p;
3790         struct inode *inode = lsp->ls_state->inode;
3791
3792         p = kzalloc(sizeof(*p), GFP_NOFS);
3793         if (p == NULL)
3794                 return NULL;
3795         p->arg.fh = NFS_FH(inode);
3796         p->arg.fl = &p->fl;
3797         p->arg.seqid = seqid;
3798         p->res.seqid = seqid;
3799         p->arg.stateid = &lsp->ls_stateid;
3800         p->lsp = lsp;
3801         atomic_inc(&lsp->ls_count);
3802         /* Ensure we don't close file until we're done freeing locks! */
3803         p->ctx = get_nfs_open_context(ctx);
3804         memcpy(&p->fl, fl, sizeof(p->fl));
3805         p->server = NFS_SERVER(inode);
3806         return p;
3807 }
3808
3809 static void nfs4_locku_release_calldata(void *data)
3810 {
3811         struct nfs4_unlockdata *calldata = data;
3812         nfs_free_seqid(calldata->arg.seqid);
3813         nfs4_put_lock_state(calldata->lsp);
3814         put_nfs_open_context(calldata->ctx);
3815         kfree(calldata);
3816 }
3817
3818 static void nfs4_locku_done(struct rpc_task *task, void *data)
3819 {
3820         struct nfs4_unlockdata *calldata = data;
3821
3822         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3823                 return;
3824         switch (task->tk_status) {
3825                 case 0:
3826                         memcpy(calldata->lsp->ls_stateid.data,
3827                                         calldata->res.stateid.data,
3828                                         sizeof(calldata->lsp->ls_stateid.data));
3829                         renew_lease(calldata->server, calldata->timestamp);
3830                         break;
3831                 case -NFS4ERR_BAD_STATEID:
3832                 case -NFS4ERR_OLD_STATEID:
3833                 case -NFS4ERR_STALE_STATEID:
3834                 case -NFS4ERR_EXPIRED:
3835                         break;
3836                 default:
3837                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3838                                 nfs_restart_rpc(task,
3839                                                  calldata->server->nfs_client);
3840         }
3841 }
3842
3843 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3844 {
3845         struct nfs4_unlockdata *calldata = data;
3846
3847         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3848                 return;
3849         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3850                 /* Note: exit _without_ running nfs4_locku_done */
3851                 task->tk_action = NULL;
3852                 return;
3853         }
3854         calldata->timestamp = jiffies;
3855         if (nfs4_setup_sequence(calldata->server,
3856                                 &calldata->arg.seq_args,
3857                                 &calldata->res.seq_res, 1, task))
3858                 return;
3859         rpc_call_start(task);
3860 }
3861
3862 static const struct rpc_call_ops nfs4_locku_ops = {
3863         .rpc_call_prepare = nfs4_locku_prepare,
3864         .rpc_call_done = nfs4_locku_done,
3865         .rpc_release = nfs4_locku_release_calldata,
3866 };
3867
3868 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3869                 struct nfs_open_context *ctx,
3870                 struct nfs4_lock_state *lsp,
3871                 struct nfs_seqid *seqid)
3872 {
3873         struct nfs4_unlockdata *data;
3874         struct rpc_message msg = {
3875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3876                 .rpc_cred = ctx->cred,
3877         };
3878         struct rpc_task_setup task_setup_data = {
3879                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3880                 .rpc_message = &msg,
3881                 .callback_ops = &nfs4_locku_ops,
3882                 .workqueue = nfsiod_workqueue,
3883                 .flags = RPC_TASK_ASYNC,
3884         };
3885
3886         /* Ensure this is an unlock - when canceling a lock, the
3887          * canceled lock is passed in, and it won't be an unlock.
3888          */
3889         fl->fl_type = F_UNLCK;
3890
3891         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3892         if (data == NULL) {
3893                 nfs_free_seqid(seqid);
3894                 return ERR_PTR(-ENOMEM);
3895         }
3896
3897         msg.rpc_argp = &data->arg,
3898         msg.rpc_resp = &data->res,
3899         task_setup_data.callback_data = data;
3900         return rpc_run_task(&task_setup_data);
3901 }
3902
3903 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3904 {
3905         struct nfs_inode *nfsi = NFS_I(state->inode);
3906         struct nfs_seqid *seqid;
3907         struct nfs4_lock_state *lsp;
3908         struct rpc_task *task;
3909         int status = 0;
3910         unsigned char fl_flags = request->fl_flags;
3911
3912         status = nfs4_set_lock_state(state, request);
3913         /* Unlock _before_ we do the RPC call */
3914         request->fl_flags |= FL_EXISTS;
3915         down_read(&nfsi->rwsem);
3916         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3917                 up_read(&nfsi->rwsem);
3918                 goto out;
3919         }
3920         up_read(&nfsi->rwsem);
3921         if (status != 0)
3922                 goto out;
3923         /* Is this a delegated lock? */
3924         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3925                 goto out;
3926         lsp = request->fl_u.nfs4_fl.owner;
3927         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3928         status = -ENOMEM;
3929         if (seqid == NULL)
3930                 goto out;
3931         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3932         status = PTR_ERR(task);
3933         if (IS_ERR(task))
3934                 goto out;
3935         status = nfs4_wait_for_completion_rpc_task(task);
3936         rpc_put_task(task);
3937 out:
3938         request->fl_flags = fl_flags;
3939         return status;
3940 }
3941
3942 struct nfs4_lockdata {
3943         struct nfs_lock_args arg;
3944         struct nfs_lock_res res;
3945         struct nfs4_lock_state *lsp;
3946         struct nfs_open_context *ctx;
3947         struct file_lock fl;
3948         unsigned long timestamp;
3949         int rpc_status;
3950         int cancelled;
3951         struct nfs_server *server;
3952 };
3953
3954 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3955                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3956                 gfp_t gfp_mask)
3957 {
3958         struct nfs4_lockdata *p;
3959         struct inode *inode = lsp->ls_state->inode;
3960         struct nfs_server *server = NFS_SERVER(inode);
3961
3962         p = kzalloc(sizeof(*p), gfp_mask);
3963         if (p == NULL)
3964                 return NULL;
3965
3966         p->arg.fh = NFS_FH(inode);
3967         p->arg.fl = &p->fl;
3968         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
3969         if (p->arg.open_seqid == NULL)
3970                 goto out_free;
3971         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
3972         if (p->arg.lock_seqid == NULL)
3973                 goto out_free_seqid;
3974         p->arg.lock_stateid = &lsp->ls_stateid;
3975         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3976         p->arg.lock_owner.id = lsp->ls_id.id;
3977         p->res.lock_seqid = p->arg.lock_seqid;
3978         p->lsp = lsp;
3979         p->server = server;
3980         atomic_inc(&lsp->ls_count);
3981         p->ctx = get_nfs_open_context(ctx);
3982         memcpy(&p->fl, fl, sizeof(p->fl));
3983         return p;
3984 out_free_seqid:
3985         nfs_free_seqid(p->arg.open_seqid);
3986 out_free:
3987         kfree(p);
3988         return NULL;
3989 }
3990
3991 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3992 {
3993         struct nfs4_lockdata *data = calldata;
3994         struct nfs4_state *state = data->lsp->ls_state;
3995
3996         dprintk("%s: begin!\n", __func__);
3997         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3998                 return;
3999         /* Do we need to do an open_to_lock_owner? */
4000         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4001                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4002                         return;
4003                 data->arg.open_stateid = &state->stateid;
4004                 data->arg.new_lock_owner = 1;
4005                 data->res.open_seqid = data->arg.open_seqid;
4006         } else
4007                 data->arg.new_lock_owner = 0;
4008         data->timestamp = jiffies;
4009         if (nfs4_setup_sequence(data->server,
4010                                 &data->arg.seq_args,
4011                                 &data->res.seq_res, 1, task))
4012                 return;
4013         rpc_call_start(task);
4014         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4015 }
4016
4017 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4018 {
4019         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4020         nfs4_lock_prepare(task, calldata);
4021 }
4022
4023 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4024 {
4025         struct nfs4_lockdata *data = calldata;
4026
4027         dprintk("%s: begin!\n", __func__);
4028
4029         if (!nfs4_sequence_done(task, &data->res.seq_res))
4030                 return;
4031
4032         data->rpc_status = task->tk_status;
4033         if (data->arg.new_lock_owner != 0) {
4034                 if (data->rpc_status == 0)
4035                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4036                 else
4037                         goto out;
4038         }
4039         if (data->rpc_status == 0) {
4040                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4041                                         sizeof(data->lsp->ls_stateid.data));
4042                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4043                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4044         }
4045 out:
4046         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4047 }
4048
4049 static void nfs4_lock_release(void *calldata)
4050 {
4051         struct nfs4_lockdata *data = calldata;
4052
4053         dprintk("%s: begin!\n", __func__);
4054         nfs_free_seqid(data->arg.open_seqid);
4055         if (data->cancelled != 0) {
4056                 struct rpc_task *task;
4057                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4058                                 data->arg.lock_seqid);
4059                 if (!IS_ERR(task))
4060                         rpc_put_task(task);
4061                 dprintk("%s: cancelling lock!\n", __func__);
4062         } else
4063                 nfs_free_seqid(data->arg.lock_seqid);
4064         nfs4_put_lock_state(data->lsp);
4065         put_nfs_open_context(data->ctx);
4066         kfree(data);
4067         dprintk("%s: done!\n", __func__);
4068 }
4069
4070 static const struct rpc_call_ops nfs4_lock_ops = {
4071         .rpc_call_prepare = nfs4_lock_prepare,
4072         .rpc_call_done = nfs4_lock_done,
4073         .rpc_release = nfs4_lock_release,
4074 };
4075
4076 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4077         .rpc_call_prepare = nfs4_recover_lock_prepare,
4078         .rpc_call_done = nfs4_lock_done,
4079         .rpc_release = nfs4_lock_release,
4080 };
4081
4082 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4083 {
4084         struct nfs_client *clp = server->nfs_client;
4085         struct nfs4_state *state = lsp->ls_state;
4086
4087         switch (error) {
4088         case -NFS4ERR_ADMIN_REVOKED:
4089         case -NFS4ERR_BAD_STATEID:
4090         case -NFS4ERR_EXPIRED:
4091                 if (new_lock_owner != 0 ||
4092                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4093                         nfs4_state_mark_reclaim_nograce(clp, state);
4094                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4095                 break;
4096         case -NFS4ERR_STALE_STATEID:
4097                 if (new_lock_owner != 0 ||
4098                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4099                         nfs4_state_mark_reclaim_reboot(clp, state);
4100                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4101         };
4102 }
4103
4104 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4105 {
4106         struct nfs4_lockdata *data;
4107         struct rpc_task *task;
4108         struct rpc_message msg = {
4109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4110                 .rpc_cred = state->owner->so_cred,
4111         };
4112         struct rpc_task_setup task_setup_data = {
4113                 .rpc_client = NFS_CLIENT(state->inode),
4114                 .rpc_message = &msg,
4115                 .callback_ops = &nfs4_lock_ops,
4116                 .workqueue = nfsiod_workqueue,
4117                 .flags = RPC_TASK_ASYNC,
4118         };
4119         int ret;
4120
4121         dprintk("%s: begin!\n", __func__);
4122         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4123                         fl->fl_u.nfs4_fl.owner,
4124                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4125         if (data == NULL)
4126                 return -ENOMEM;
4127         if (IS_SETLKW(cmd))
4128                 data->arg.block = 1;
4129         if (recovery_type > NFS_LOCK_NEW) {
4130                 if (recovery_type == NFS_LOCK_RECLAIM)
4131                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4132                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4133         }
4134         msg.rpc_argp = &data->arg,
4135         msg.rpc_resp = &data->res,
4136         task_setup_data.callback_data = data;
4137         task = rpc_run_task(&task_setup_data);
4138         if (IS_ERR(task))
4139                 return PTR_ERR(task);
4140         ret = nfs4_wait_for_completion_rpc_task(task);
4141         if (ret == 0) {
4142                 ret = data->rpc_status;
4143                 if (ret)
4144                         nfs4_handle_setlk_error(data->server, data->lsp,
4145                                         data->arg.new_lock_owner, ret);
4146         } else
4147                 data->cancelled = 1;
4148         rpc_put_task(task);
4149         dprintk("%s: done, ret = %d!\n", __func__, ret);
4150         return ret;
4151 }
4152
4153 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4154 {
4155         struct nfs_server *server = NFS_SERVER(state->inode);
4156         struct nfs4_exception exception = { };
4157         int err;
4158
4159         do {
4160                 /* Cache the lock if possible... */
4161                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4162                         return 0;
4163                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4164                 if (err != -NFS4ERR_DELAY)
4165                         break;
4166                 nfs4_handle_exception(server, err, &exception);
4167         } while (exception.retry);
4168         return err;
4169 }
4170
4171 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4172 {
4173         struct nfs_server *server = NFS_SERVER(state->inode);
4174         struct nfs4_exception exception = { };
4175         int err;
4176
4177         err = nfs4_set_lock_state(state, request);
4178         if (err != 0)
4179                 return err;
4180         do {
4181                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4182                         return 0;
4183                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4184                 switch (err) {
4185                 default:
4186                         goto out;
4187                 case -NFS4ERR_GRACE:
4188                 case -NFS4ERR_DELAY:
4189                         nfs4_handle_exception(server, err, &exception);
4190                         err = 0;
4191                 }
4192         } while (exception.retry);
4193 out:
4194         return err;
4195 }
4196
4197 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4198 {
4199         struct nfs_inode *nfsi = NFS_I(state->inode);
4200         unsigned char fl_flags = request->fl_flags;
4201         int status = -ENOLCK;
4202
4203         if ((fl_flags & FL_POSIX) &&
4204                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4205                 goto out;
4206         /* Is this a delegated open? */
4207         status = nfs4_set_lock_state(state, request);
4208         if (status != 0)
4209                 goto out;
4210         request->fl_flags |= FL_ACCESS;
4211         status = do_vfs_lock(request->fl_file, request);
4212         if (status < 0)
4213                 goto out;
4214         down_read(&nfsi->rwsem);
4215         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4216                 /* Yes: cache locks! */
4217                 /* ...but avoid races with delegation recall... */
4218                 request->fl_flags = fl_flags & ~FL_SLEEP;
4219                 status = do_vfs_lock(request->fl_file, request);
4220                 goto out_unlock;
4221         }
4222         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4223         if (status != 0)
4224                 goto out_unlock;
4225         /* Note: we always want to sleep here! */
4226         request->fl_flags = fl_flags | FL_SLEEP;
4227         if (do_vfs_lock(request->fl_file, request) < 0)
4228                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4229 out_unlock:
4230         up_read(&nfsi->rwsem);
4231 out:
4232         request->fl_flags = fl_flags;
4233         return status;
4234 }
4235
4236 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4237 {
4238         struct nfs4_exception exception = { };
4239         int err;
4240
4241         do {
4242                 err = _nfs4_proc_setlk(state, cmd, request);
4243                 if (err == -NFS4ERR_DENIED)
4244                         err = -EAGAIN;
4245                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4246                                 err, &exception);
4247         } while (exception.retry);
4248         return err;
4249 }
4250
4251 static int
4252 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4253 {
4254         struct nfs_open_context *ctx;
4255         struct nfs4_state *state;
4256         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4257         int status;
4258
4259         /* verify open state */
4260         ctx = nfs_file_open_context(filp);
4261         state = ctx->state;
4262
4263         if (request->fl_start < 0 || request->fl_end < 0)
4264                 return -EINVAL;
4265
4266         if (IS_GETLK(cmd)) {
4267                 if (state != NULL)
4268                         return nfs4_proc_getlk(state, F_GETLK, request);
4269                 return 0;
4270         }
4271
4272         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4273                 return -EINVAL;
4274
4275         if (request->fl_type == F_UNLCK) {
4276                 if (state != NULL)
4277                         return nfs4_proc_unlck(state, cmd, request);
4278                 return 0;
4279         }
4280
4281         if (state == NULL)
4282                 return -ENOLCK;
4283         do {
4284                 status = nfs4_proc_setlk(state, cmd, request);
4285                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4286                         break;
4287                 timeout = nfs4_set_lock_task_retry(timeout);
4288                 status = -ERESTARTSYS;
4289                 if (signalled())
4290                         break;
4291         } while(status < 0);
4292         return status;
4293 }
4294
4295 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4296 {
4297         struct nfs_server *server = NFS_SERVER(state->inode);
4298         struct nfs4_exception exception = { };
4299         int err;
4300
4301         err = nfs4_set_lock_state(state, fl);
4302         if (err != 0)
4303                 goto out;
4304         do {
4305                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4306                 switch (err) {
4307                         default:
4308                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4309                                                 __func__, err);
4310                         case 0:
4311                         case -ESTALE:
4312                                 goto out;
4313                         case -NFS4ERR_EXPIRED:
4314                         case -NFS4ERR_STALE_CLIENTID:
4315                         case -NFS4ERR_STALE_STATEID:
4316                         case -NFS4ERR_BADSESSION:
4317                         case -NFS4ERR_BADSLOT:
4318                         case -NFS4ERR_BAD_HIGH_SLOT:
4319                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4320                         case -NFS4ERR_DEADSESSION:
4321                                 nfs4_schedule_state_recovery(server->nfs_client);
4322                                 goto out;
4323                         case -ERESTARTSYS:
4324                                 /*
4325                                  * The show must go on: exit, but mark the
4326                                  * stateid as needing recovery.
4327                                  */
4328                         case -NFS4ERR_ADMIN_REVOKED:
4329                         case -NFS4ERR_BAD_STATEID:
4330                         case -NFS4ERR_OPENMODE:
4331                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4332                                 err = 0;
4333                                 goto out;
4334                         case -EKEYEXPIRED:
4335                                 /*
4336                                  * User RPCSEC_GSS context has expired.
4337                                  * We cannot recover this stateid now, so
4338                                  * skip it and allow recovery thread to
4339                                  * proceed.
4340                                  */
4341                                 err = 0;
4342                                 goto out;
4343                         case -ENOMEM:
4344                         case -NFS4ERR_DENIED:
4345                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4346                                 err = 0;
4347                                 goto out;
4348                         case -NFS4ERR_DELAY:
4349                                 break;
4350                 }
4351                 err = nfs4_handle_exception(server, err, &exception);
4352         } while (exception.retry);
4353 out:
4354         return err;
4355 }
4356
4357 static void nfs4_release_lockowner_release(void *calldata)
4358 {
4359         kfree(calldata);
4360 }
4361
4362 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4363         .rpc_release = nfs4_release_lockowner_release,
4364 };
4365
4366 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4367 {
4368         struct nfs_server *server = lsp->ls_state->owner->so_server;
4369         struct nfs_release_lockowner_args *args;
4370         struct rpc_message msg = {
4371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4372         };
4373
4374         if (server->nfs_client->cl_mvops->minor_version != 0)
4375                 return;
4376         args = kmalloc(sizeof(*args), GFP_NOFS);
4377         if (!args)
4378                 return;
4379         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4380         args->lock_owner.id = lsp->ls_id.id;
4381         msg.rpc_argp = args;
4382         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4383 }
4384
4385 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4386
4387 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4388                 size_t buflen, int flags)
4389 {
4390         struct inode *inode = dentry->d_inode;
4391
4392         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4393                 return -EOPNOTSUPP;
4394
4395         return nfs4_proc_set_acl(inode, buf, buflen);
4396 }
4397
4398 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4399  * and that's what we'll do for e.g. user attributes that haven't been set.
4400  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4401  * attributes in kernel-managed attribute namespaces. */
4402 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4403                 size_t buflen)
4404 {
4405         struct inode *inode = dentry->d_inode;
4406
4407         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4408                 return -EOPNOTSUPP;
4409
4410         return nfs4_proc_get_acl(inode, buf, buflen);
4411 }
4412
4413 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4414 {
4415         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4416
4417         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4418                 return 0;
4419         if (buf && buflen < len)
4420                 return -ERANGE;
4421         if (buf)
4422                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4423         return len;
4424 }
4425
4426 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4427 {
4428         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4429                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4430                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4431                 return;
4432
4433         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4434                 NFS_ATTR_FATTR_NLINK;
4435         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4436         fattr->nlink = 2;
4437 }
4438
4439 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4440                 struct nfs4_fs_locations *fs_locations, struct page *page)
4441 {
4442         struct nfs_server *server = NFS_SERVER(dir);
4443         u32 bitmask[2] = {
4444                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4445                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4446         };
4447         struct nfs4_fs_locations_arg args = {
4448                 .dir_fh = NFS_FH(dir),
4449                 .name = name,
4450                 .page = page,
4451                 .bitmask = bitmask,
4452         };
4453         struct nfs4_fs_locations_res res = {
4454                 .fs_locations = fs_locations,
4455         };
4456         struct rpc_message msg = {
4457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4458                 .rpc_argp = &args,
4459                 .rpc_resp = &res,
4460         };
4461         int status;
4462
4463         dprintk("%s: start\n", __func__);
4464         nfs_fattr_init(&fs_locations->fattr);
4465         fs_locations->server = server;
4466         fs_locations->nlocations = 0;
4467         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4468         nfs_fixup_referral_attributes(&fs_locations->fattr);
4469         dprintk("%s: returned status = %d\n", __func__, status);
4470         return status;
4471 }
4472
4473 #ifdef CONFIG_NFS_V4_1
4474 /*
4475  * nfs4_proc_exchange_id()
4476  *
4477  * Since the clientid has expired, all compounds using sessions
4478  * associated with the stale clientid will be returning
4479  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4480  * be in some phase of session reset.
4481  */
4482 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4483 {
4484         nfs4_verifier verifier;
4485         struct nfs41_exchange_id_args args = {
4486                 .client = clp,
4487                 .flags = clp->cl_exchange_flags,
4488         };
4489         struct nfs41_exchange_id_res res = {
4490                 .client = clp,
4491         };
4492         int status;
4493         struct rpc_message msg = {
4494                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4495                 .rpc_argp = &args,
4496                 .rpc_resp = &res,
4497                 .rpc_cred = cred,
4498         };
4499         __be32 *p;
4500
4501         dprintk("--> %s\n", __func__);
4502         BUG_ON(clp == NULL);
4503
4504         /* Remove server-only flags */
4505         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4506
4507         p = (u32 *)verifier.data;
4508         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4509         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4510         args.verifier = &verifier;
4511
4512         while (1) {
4513                 args.id_len = scnprintf(args.id, sizeof(args.id),
4514                                         "%s/%s %u",
4515                                         clp->cl_ipaddr,
4516                                         rpc_peeraddr2str(clp->cl_rpcclient,
4517                                                          RPC_DISPLAY_ADDR),
4518                                         clp->cl_id_uniquifier);
4519
4520                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4521
4522                 if (status != -NFS4ERR_CLID_INUSE)
4523                         break;
4524
4525                 if (signalled())
4526                         break;
4527
4528                 if (++clp->cl_id_uniquifier == 0)
4529                         break;
4530         }
4531
4532         dprintk("<-- %s status= %d\n", __func__, status);
4533         return status;
4534 }
4535
4536 struct nfs4_get_lease_time_data {
4537         struct nfs4_get_lease_time_args *args;
4538         struct nfs4_get_lease_time_res *res;
4539         struct nfs_client *clp;
4540 };
4541
4542 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4543                                         void *calldata)
4544 {
4545         int ret;
4546         struct nfs4_get_lease_time_data *data =
4547                         (struct nfs4_get_lease_time_data *)calldata;
4548
4549         dprintk("--> %s\n", __func__);
4550         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4551         /* just setup sequence, do not trigger session recovery
4552            since we're invoked within one */
4553         ret = nfs41_setup_sequence(data->clp->cl_session,
4554                                    &data->args->la_seq_args,
4555                                    &data->res->lr_seq_res, 0, task);
4556
4557         BUG_ON(ret == -EAGAIN);
4558         rpc_call_start(task);
4559         dprintk("<-- %s\n", __func__);
4560 }
4561
4562 /*
4563  * Called from nfs4_state_manager thread for session setup, so don't recover
4564  * from sequence operation or clientid errors.
4565  */
4566 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4567 {
4568         struct nfs4_get_lease_time_data *data =
4569                         (struct nfs4_get_lease_time_data *)calldata;
4570
4571         dprintk("--> %s\n", __func__);
4572         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4573                 return;
4574         switch (task->tk_status) {
4575         case -NFS4ERR_DELAY:
4576         case -NFS4ERR_GRACE:
4577                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4578                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4579                 task->tk_status = 0;
4580                 nfs_restart_rpc(task, data->clp);
4581                 return;
4582         }
4583         dprintk("<-- %s\n", __func__);
4584 }
4585
4586 struct rpc_call_ops nfs4_get_lease_time_ops = {
4587         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4588         .rpc_call_done = nfs4_get_lease_time_done,
4589 };
4590
4591 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4592 {
4593         struct rpc_task *task;
4594         struct nfs4_get_lease_time_args args;
4595         struct nfs4_get_lease_time_res res = {
4596                 .lr_fsinfo = fsinfo,
4597         };
4598         struct nfs4_get_lease_time_data data = {
4599                 .args = &args,
4600                 .res = &res,
4601                 .clp = clp,
4602         };
4603         struct rpc_message msg = {
4604                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4605                 .rpc_argp = &args,
4606                 .rpc_resp = &res,
4607         };
4608         struct rpc_task_setup task_setup = {
4609                 .rpc_client = clp->cl_rpcclient,
4610                 .rpc_message = &msg,
4611                 .callback_ops = &nfs4_get_lease_time_ops,
4612                 .callback_data = &data
4613         };
4614         int status;
4615
4616         dprintk("--> %s\n", __func__);
4617         task = rpc_run_task(&task_setup);
4618
4619         if (IS_ERR(task))
4620                 status = PTR_ERR(task);
4621         else {
4622                 status = task->tk_status;
4623                 rpc_put_task(task);
4624         }
4625         dprintk("<-- %s return %d\n", __func__, status);
4626
4627         return status;
4628 }
4629
4630 /*
4631  * Reset a slot table
4632  */
4633 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4634                                  int ivalue)
4635 {
4636         struct nfs4_slot *new = NULL;
4637         int i;
4638         int ret = 0;
4639
4640         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4641                 max_reqs, tbl->max_slots);
4642
4643         /* Does the newly negotiated max_reqs match the existing slot table? */
4644         if (max_reqs != tbl->max_slots) {
4645                 ret = -ENOMEM;
4646                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4647                               GFP_NOFS);
4648                 if (!new)
4649                         goto out;
4650                 ret = 0;
4651                 kfree(tbl->slots);
4652         }
4653         spin_lock(&tbl->slot_tbl_lock);
4654         if (new) {
4655                 tbl->slots = new;
4656                 tbl->max_slots = max_reqs;
4657         }
4658         for (i = 0; i < tbl->max_slots; ++i)
4659                 tbl->slots[i].seq_nr = ivalue;
4660         spin_unlock(&tbl->slot_tbl_lock);
4661         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4662                 tbl, tbl->slots, tbl->max_slots);
4663 out:
4664         dprintk("<-- %s: return %d\n", __func__, ret);
4665         return ret;
4666 }
4667
4668 /*
4669  * Reset the forechannel and backchannel slot tables
4670  */
4671 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4672 {
4673         int status;
4674
4675         status = nfs4_reset_slot_table(&session->fc_slot_table,
4676                         session->fc_attrs.max_reqs, 1);
4677         if (status)
4678                 return status;
4679
4680         status = nfs4_reset_slot_table(&session->bc_slot_table,
4681                         session->bc_attrs.max_reqs, 0);
4682         return status;
4683 }
4684
4685 /* Destroy the slot table */
4686 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4687 {
4688         if (session->fc_slot_table.slots != NULL) {
4689                 kfree(session->fc_slot_table.slots);
4690                 session->fc_slot_table.slots = NULL;
4691         }
4692         if (session->bc_slot_table.slots != NULL) {
4693                 kfree(session->bc_slot_table.slots);
4694                 session->bc_slot_table.slots = NULL;
4695         }
4696         return;
4697 }
4698
4699 /*
4700  * Initialize slot table
4701  */
4702 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4703                 int max_slots, int ivalue)
4704 {
4705         struct nfs4_slot *slot;
4706         int ret = -ENOMEM;
4707
4708         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4709
4710         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4711
4712         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4713         if (!slot)
4714                 goto out;
4715         ret = 0;
4716
4717         spin_lock(&tbl->slot_tbl_lock);
4718         tbl->max_slots = max_slots;
4719         tbl->slots = slot;
4720         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4721         spin_unlock(&tbl->slot_tbl_lock);
4722         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4723                 tbl, tbl->slots, tbl->max_slots);
4724 out:
4725         dprintk("<-- %s: return %d\n", __func__, ret);
4726         return ret;
4727 }
4728
4729 /*
4730  * Initialize the forechannel and backchannel tables
4731  */
4732 static int nfs4_init_slot_tables(struct nfs4_session *session)
4733 {
4734         struct nfs4_slot_table *tbl;
4735         int status = 0;
4736
4737         tbl = &session->fc_slot_table;
4738         if (tbl->slots == NULL) {
4739                 status = nfs4_init_slot_table(tbl,
4740                                 session->fc_attrs.max_reqs, 1);
4741                 if (status)
4742                         return status;
4743         }
4744
4745         tbl = &session->bc_slot_table;
4746         if (tbl->slots == NULL) {
4747                 status = nfs4_init_slot_table(tbl,
4748                                 session->bc_attrs.max_reqs, 0);
4749                 if (status)
4750                         nfs4_destroy_slot_tables(session);
4751         }
4752
4753         return status;
4754 }
4755
4756 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4757 {
4758         struct nfs4_session *session;
4759         struct nfs4_slot_table *tbl;
4760
4761         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4762         if (!session)
4763                 return NULL;
4764
4765         init_completion(&session->complete);
4766
4767         tbl = &session->fc_slot_table;
4768         tbl->highest_used_slotid = -1;
4769         spin_lock_init(&tbl->slot_tbl_lock);
4770         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4771
4772         tbl = &session->bc_slot_table;
4773         tbl->highest_used_slotid = -1;
4774         spin_lock_init(&tbl->slot_tbl_lock);
4775         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4776
4777         session->session_state = 1<<NFS4_SESSION_INITING;
4778
4779         session->clp = clp;
4780         return session;
4781 }
4782
4783 void nfs4_destroy_session(struct nfs4_session *session)
4784 {
4785         nfs4_proc_destroy_session(session);
4786         dprintk("%s Destroy backchannel for xprt %p\n",
4787                 __func__, session->clp->cl_rpcclient->cl_xprt);
4788         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4789                                 NFS41_BC_MIN_CALLBACKS);
4790         nfs4_destroy_slot_tables(session);
4791         kfree(session);
4792 }
4793
4794 /*
4795  * Initialize the values to be used by the client in CREATE_SESSION
4796  * If nfs4_init_session set the fore channel request and response sizes,
4797  * use them.
4798  *
4799  * Set the back channel max_resp_sz_cached to zero to force the client to
4800  * always set csa_cachethis to FALSE because the current implementation
4801  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4802  */
4803 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4804 {
4805         struct nfs4_session *session = args->client->cl_session;
4806         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4807                      mxresp_sz = session->fc_attrs.max_resp_sz;
4808
4809         if (mxrqst_sz == 0)
4810                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4811         if (mxresp_sz == 0)
4812                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4813         /* Fore channel attributes */
4814         args->fc_attrs.headerpadsz = 0;
4815         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4816         args->fc_attrs.max_resp_sz = mxresp_sz;
4817         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4818         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4819
4820         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4821                 "max_ops=%u max_reqs=%u\n",
4822                 __func__,
4823                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4824                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4825
4826         /* Back channel attributes */
4827         args->bc_attrs.headerpadsz = 0;
4828         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4829         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4830         args->bc_attrs.max_resp_sz_cached = 0;
4831         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4832         args->bc_attrs.max_reqs = 1;
4833
4834         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4835                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4836                 __func__,
4837                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4838                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4839                 args->bc_attrs.max_reqs);
4840 }
4841
4842 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4843 {
4844         if (rcvd <= sent)
4845                 return 0;
4846         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4847                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4848         return -EINVAL;
4849 }
4850
4851 #define _verify_fore_channel_attr(_name_) \
4852         _verify_channel_attr("fore", #_name_, \
4853                              args->fc_attrs._name_, \
4854                              session->fc_attrs._name_)
4855
4856 #define _verify_back_channel_attr(_name_) \
4857         _verify_channel_attr("back", #_name_, \
4858                              args->bc_attrs._name_, \
4859                              session->bc_attrs._name_)
4860
4861 /*
4862  * The server is not allowed to increase the fore channel header pad size,
4863  * maximum response size, or maximum number of operations.
4864  *
4865  * The back channel attributes are only negotiatied down: We send what the
4866  * (back channel) server insists upon.
4867  */
4868 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4869                                      struct nfs4_session *session)
4870 {
4871         int ret = 0;
4872
4873         ret |= _verify_fore_channel_attr(headerpadsz);
4874         ret |= _verify_fore_channel_attr(max_resp_sz);
4875         ret |= _verify_fore_channel_attr(max_ops);
4876
4877         ret |= _verify_back_channel_attr(headerpadsz);
4878         ret |= _verify_back_channel_attr(max_rqst_sz);
4879         ret |= _verify_back_channel_attr(max_resp_sz);
4880         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4881         ret |= _verify_back_channel_attr(max_ops);
4882         ret |= _verify_back_channel_attr(max_reqs);
4883
4884         return ret;
4885 }
4886
4887 static int _nfs4_proc_create_session(struct nfs_client *clp)
4888 {
4889         struct nfs4_session *session = clp->cl_session;
4890         struct nfs41_create_session_args args = {
4891                 .client = clp,
4892                 .cb_program = NFS4_CALLBACK,
4893         };
4894         struct nfs41_create_session_res res = {
4895                 .client = clp,
4896         };
4897         struct rpc_message msg = {
4898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4899                 .rpc_argp = &args,
4900                 .rpc_resp = &res,
4901         };
4902         int status;
4903
4904         nfs4_init_channel_attrs(&args);
4905         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4906
4907         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4908
4909         if (!status)
4910                 /* Verify the session's negotiated channel_attrs values */
4911                 status = nfs4_verify_channel_attrs(&args, session);
4912         if (!status) {
4913                 /* Increment the clientid slot sequence id */
4914                 clp->cl_seqid++;
4915         }
4916
4917         return status;
4918 }
4919
4920 /*
4921  * Issues a CREATE_SESSION operation to the server.
4922  * It is the responsibility of the caller to verify the session is
4923  * expired before calling this routine.
4924  */
4925 int nfs4_proc_create_session(struct nfs_client *clp)
4926 {
4927         int status;
4928         unsigned *ptr;
4929         struct nfs4_session *session = clp->cl_session;
4930
4931         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4932
4933         status = _nfs4_proc_create_session(clp);
4934         if (status)
4935                 goto out;
4936
4937         /* Init and reset the fore channel */
4938         status = nfs4_init_slot_tables(session);
4939         dprintk("slot table initialization returned %d\n", status);
4940         if (status)
4941                 goto out;
4942         status = nfs4_reset_slot_tables(session);
4943         dprintk("slot table reset returned %d\n", status);
4944         if (status)
4945                 goto out;
4946
4947         ptr = (unsigned *)&session->sess_id.data[0];
4948         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4949                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4950 out:
4951         dprintk("<-- %s\n", __func__);
4952         return status;
4953 }
4954
4955 /*
4956  * Issue the over-the-wire RPC DESTROY_SESSION.
4957  * The caller must serialize access to this routine.
4958  */
4959 int nfs4_proc_destroy_session(struct nfs4_session *session)
4960 {
4961         int status = 0;
4962         struct rpc_message msg;
4963
4964         dprintk("--> nfs4_proc_destroy_session\n");
4965
4966         /* session is still being setup */
4967         if (session->clp->cl_cons_state != NFS_CS_READY)
4968                 return status;
4969
4970         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4971         msg.rpc_argp = session;
4972         msg.rpc_resp = NULL;
4973         msg.rpc_cred = NULL;
4974         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4975
4976         if (status)
4977                 printk(KERN_WARNING
4978                         "Got error %d from the server on DESTROY_SESSION. "
4979                         "Session has been destroyed regardless...\n", status);
4980
4981         dprintk("<-- nfs4_proc_destroy_session\n");
4982         return status;
4983 }
4984
4985 int nfs4_init_session(struct nfs_server *server)
4986 {
4987         struct nfs_client *clp = server->nfs_client;
4988         struct nfs4_session *session;
4989         unsigned int rsize, wsize;
4990         int ret;
4991
4992         if (!nfs4_has_session(clp))
4993                 return 0;
4994
4995         session = clp->cl_session;
4996         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
4997                 return 0;
4998
4999         rsize = server->rsize;
5000         if (rsize == 0)
5001                 rsize = NFS_MAX_FILE_IO_SIZE;
5002         wsize = server->wsize;
5003         if (wsize == 0)
5004                 wsize = NFS_MAX_FILE_IO_SIZE;
5005
5006         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5007         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5008
5009         ret = nfs4_recover_expired_lease(server);
5010         if (!ret)
5011                 ret = nfs4_check_client_ready(clp);
5012         return ret;
5013 }
5014
5015 /*
5016  * Renew the cl_session lease.
5017  */
5018 struct nfs4_sequence_data {
5019         struct nfs_client *clp;
5020         struct nfs4_sequence_args args;
5021         struct nfs4_sequence_res res;
5022 };
5023
5024 static void nfs41_sequence_release(void *data)
5025 {
5026         struct nfs4_sequence_data *calldata = data;
5027         struct nfs_client *clp = calldata->clp;
5028
5029         if (atomic_read(&clp->cl_count) > 1)
5030                 nfs4_schedule_state_renewal(clp);
5031         nfs_put_client(clp);
5032         kfree(calldata);
5033 }
5034
5035 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5036 {
5037         switch(task->tk_status) {
5038         case -NFS4ERR_DELAY:
5039                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5040                 return -EAGAIN;
5041         default:
5042                 nfs4_schedule_state_recovery(clp);
5043         }
5044         return 0;
5045 }
5046
5047 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5048 {
5049         struct nfs4_sequence_data *calldata = data;
5050         struct nfs_client *clp = calldata->clp;
5051
5052         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5053                 return;
5054
5055         if (task->tk_status < 0) {
5056                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5057                 if (atomic_read(&clp->cl_count) == 1)
5058                         goto out;
5059
5060                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5061                         rpc_restart_call_prepare(task);
5062                         return;
5063                 }
5064         }
5065         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5066 out:
5067         dprintk("<-- %s\n", __func__);
5068 }
5069
5070 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5071 {
5072         struct nfs4_sequence_data *calldata = data;
5073         struct nfs_client *clp = calldata->clp;
5074         struct nfs4_sequence_args *args;
5075         struct nfs4_sequence_res *res;
5076
5077         args = task->tk_msg.rpc_argp;
5078         res = task->tk_msg.rpc_resp;
5079
5080         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5081                 return;
5082         rpc_call_start(task);
5083 }
5084
5085 static const struct rpc_call_ops nfs41_sequence_ops = {
5086         .rpc_call_done = nfs41_sequence_call_done,
5087         .rpc_call_prepare = nfs41_sequence_prepare,
5088         .rpc_release = nfs41_sequence_release,
5089 };
5090
5091 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5092 {
5093         struct nfs4_sequence_data *calldata;
5094         struct rpc_message msg = {
5095                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5096                 .rpc_cred = cred,
5097         };
5098         struct rpc_task_setup task_setup_data = {
5099                 .rpc_client = clp->cl_rpcclient,
5100                 .rpc_message = &msg,
5101                 .callback_ops = &nfs41_sequence_ops,
5102                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5103         };
5104
5105         if (!atomic_inc_not_zero(&clp->cl_count))
5106                 return ERR_PTR(-EIO);
5107         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5108         if (calldata == NULL) {
5109                 nfs_put_client(clp);
5110                 return ERR_PTR(-ENOMEM);
5111         }
5112         msg.rpc_argp = &calldata->args;
5113         msg.rpc_resp = &calldata->res;
5114         calldata->clp = clp;
5115         task_setup_data.callback_data = calldata;
5116
5117         return rpc_run_task(&task_setup_data);
5118 }
5119
5120 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5121 {
5122         struct rpc_task *task;
5123         int ret = 0;
5124
5125         task = _nfs41_proc_sequence(clp, cred);
5126         if (IS_ERR(task))
5127                 ret = PTR_ERR(task);
5128         else
5129                 rpc_put_task(task);
5130         dprintk("<-- %s status=%d\n", __func__, ret);
5131         return ret;
5132 }
5133
5134 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5135 {
5136         struct rpc_task *task;
5137         int ret;
5138
5139         task = _nfs41_proc_sequence(clp, cred);
5140         if (IS_ERR(task)) {
5141                 ret = PTR_ERR(task);
5142                 goto out;
5143         }
5144         ret = rpc_wait_for_completion_task(task);
5145         if (!ret)
5146                 ret = task->tk_status;
5147         rpc_put_task(task);
5148 out:
5149         dprintk("<-- %s status=%d\n", __func__, ret);
5150         return ret;
5151 }
5152
5153 struct nfs4_reclaim_complete_data {
5154         struct nfs_client *clp;
5155         struct nfs41_reclaim_complete_args arg;
5156         struct nfs41_reclaim_complete_res res;
5157 };
5158
5159 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5160 {
5161         struct nfs4_reclaim_complete_data *calldata = data;
5162
5163         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5164         if (nfs41_setup_sequence(calldata->clp->cl_session,
5165                                 &calldata->arg.seq_args,
5166                                 &calldata->res.seq_res, 0, task))
5167                 return;
5168
5169         rpc_call_start(task);
5170 }
5171
5172 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5173 {
5174         switch(task->tk_status) {
5175         case 0:
5176         case -NFS4ERR_COMPLETE_ALREADY:
5177         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5178                 break;
5179         case -NFS4ERR_DELAY:
5180                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5181                 return -EAGAIN;
5182         default:
5183                 nfs4_schedule_state_recovery(clp);
5184         }
5185         return 0;
5186 }
5187
5188 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5189 {
5190         struct nfs4_reclaim_complete_data *calldata = data;
5191         struct nfs_client *clp = calldata->clp;
5192         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5193
5194         dprintk("--> %s\n", __func__);
5195         if (!nfs41_sequence_done(task, res))
5196                 return;
5197
5198         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5199                 rpc_restart_call_prepare(task);
5200                 return;
5201         }
5202         dprintk("<-- %s\n", __func__);
5203 }
5204
5205 static void nfs4_free_reclaim_complete_data(void *data)
5206 {
5207         struct nfs4_reclaim_complete_data *calldata = data;
5208
5209         kfree(calldata);
5210 }
5211
5212 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5213         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5214         .rpc_call_done = nfs4_reclaim_complete_done,
5215         .rpc_release = nfs4_free_reclaim_complete_data,
5216 };
5217
5218 /*
5219  * Issue a global reclaim complete.
5220  */
5221 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5222 {
5223         struct nfs4_reclaim_complete_data *calldata;
5224         struct rpc_task *task;
5225         struct rpc_message msg = {
5226                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5227         };
5228         struct rpc_task_setup task_setup_data = {
5229                 .rpc_client = clp->cl_rpcclient,
5230                 .rpc_message = &msg,
5231                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5232                 .flags = RPC_TASK_ASYNC,
5233         };
5234         int status = -ENOMEM;
5235
5236         dprintk("--> %s\n", __func__);
5237         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5238         if (calldata == NULL)
5239                 goto out;
5240         calldata->clp = clp;
5241         calldata->arg.one_fs = 0;
5242
5243         msg.rpc_argp = &calldata->arg;
5244         msg.rpc_resp = &calldata->res;
5245         task_setup_data.callback_data = calldata;
5246         task = rpc_run_task(&task_setup_data);
5247         if (IS_ERR(task)) {
5248                 status = PTR_ERR(task);
5249                 goto out;
5250         }
5251         rpc_put_task(task);
5252         return 0;
5253 out:
5254         dprintk("<-- %s status=%d\n", __func__, status);
5255         return status;
5256 }
5257 #endif /* CONFIG_NFS_V4_1 */
5258
5259 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5260         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5261         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5262         .recover_open   = nfs4_open_reclaim,
5263         .recover_lock   = nfs4_lock_reclaim,
5264         .establish_clid = nfs4_init_clientid,
5265         .get_clid_cred  = nfs4_get_setclientid_cred,
5266 };
5267
5268 #if defined(CONFIG_NFS_V4_1)
5269 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5270         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5271         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5272         .recover_open   = nfs4_open_reclaim,
5273         .recover_lock   = nfs4_lock_reclaim,
5274         .establish_clid = nfs41_init_clientid,
5275         .get_clid_cred  = nfs4_get_exchange_id_cred,
5276         .reclaim_complete = nfs41_proc_reclaim_complete,
5277 };
5278 #endif /* CONFIG_NFS_V4_1 */
5279
5280 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5281         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5282         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5283         .recover_open   = nfs4_open_expired,
5284         .recover_lock   = nfs4_lock_expired,
5285         .establish_clid = nfs4_init_clientid,
5286         .get_clid_cred  = nfs4_get_setclientid_cred,
5287 };
5288
5289 #if defined(CONFIG_NFS_V4_1)
5290 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5291         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5292         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5293         .recover_open   = nfs4_open_expired,
5294         .recover_lock   = nfs4_lock_expired,
5295         .establish_clid = nfs41_init_clientid,
5296         .get_clid_cred  = nfs4_get_exchange_id_cred,
5297 };
5298 #endif /* CONFIG_NFS_V4_1 */
5299
5300 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5301         .sched_state_renewal = nfs4_proc_async_renew,
5302         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5303         .renew_lease = nfs4_proc_renew,
5304 };
5305
5306 #if defined(CONFIG_NFS_V4_1)
5307 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5308         .sched_state_renewal = nfs41_proc_async_sequence,
5309         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5310         .renew_lease = nfs4_proc_sequence,
5311 };
5312 #endif
5313
5314 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5315         .minor_version = 0,
5316         .call_sync = _nfs4_call_sync,
5317         .validate_stateid = nfs4_validate_delegation_stateid,
5318         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5319         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5320         .state_renewal_ops = &nfs40_state_renewal_ops,
5321 };
5322
5323 #if defined(CONFIG_NFS_V4_1)
5324 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5325         .minor_version = 1,
5326         .call_sync = _nfs4_call_sync_session,
5327         .validate_stateid = nfs41_validate_delegation_stateid,
5328         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5329         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5330         .state_renewal_ops = &nfs41_state_renewal_ops,
5331 };
5332 #endif
5333
5334 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5335         [0] = &nfs_v4_0_minor_ops,
5336 #if defined(CONFIG_NFS_V4_1)
5337         [1] = &nfs_v4_1_minor_ops,
5338 #endif
5339 };
5340
5341 static const struct inode_operations nfs4_file_inode_operations = {
5342         .permission     = nfs_permission,
5343         .getattr        = nfs_getattr,
5344         .setattr        = nfs_setattr,
5345         .getxattr       = nfs4_getxattr,
5346         .setxattr       = nfs4_setxattr,
5347         .listxattr      = nfs4_listxattr,
5348 };
5349
5350 const struct nfs_rpc_ops nfs_v4_clientops = {
5351         .version        = 4,                    /* protocol version */
5352         .dentry_ops     = &nfs4_dentry_operations,
5353         .dir_inode_ops  = &nfs4_dir_inode_operations,
5354         .file_inode_ops = &nfs4_file_inode_operations,
5355         .getroot        = nfs4_proc_get_root,
5356         .getattr        = nfs4_proc_getattr,
5357         .setattr        = nfs4_proc_setattr,
5358         .lookupfh       = nfs4_proc_lookupfh,
5359         .lookup         = nfs4_proc_lookup,
5360         .access         = nfs4_proc_access,
5361         .readlink       = nfs4_proc_readlink,
5362         .create         = nfs4_proc_create,
5363         .remove         = nfs4_proc_remove,
5364         .unlink_setup   = nfs4_proc_unlink_setup,
5365         .unlink_done    = nfs4_proc_unlink_done,
5366         .rename         = nfs4_proc_rename,
5367         .rename_setup   = nfs4_proc_rename_setup,
5368         .rename_done    = nfs4_proc_rename_done,
5369         .link           = nfs4_proc_link,
5370         .symlink        = nfs4_proc_symlink,
5371         .mkdir          = nfs4_proc_mkdir,
5372         .rmdir          = nfs4_proc_remove,
5373         .readdir        = nfs4_proc_readdir,
5374         .mknod          = nfs4_proc_mknod,
5375         .statfs         = nfs4_proc_statfs,
5376         .fsinfo         = nfs4_proc_fsinfo,
5377         .pathconf       = nfs4_proc_pathconf,
5378         .set_capabilities = nfs4_server_capabilities,
5379         .decode_dirent  = nfs4_decode_dirent,
5380         .read_setup     = nfs4_proc_read_setup,
5381         .read_done      = nfs4_read_done,
5382         .write_setup    = nfs4_proc_write_setup,
5383         .write_done     = nfs4_write_done,
5384         .commit_setup   = nfs4_proc_commit_setup,
5385         .commit_done    = nfs4_commit_done,
5386         .lock           = nfs4_proc_lock,
5387         .clear_acl_cache = nfs4_zap_acl_attr,
5388         .close_context  = nfs4_close_context,
5389         .open_context   = nfs4_atomic_open,
5390 };
5391
5392 /*
5393  * Local variables:
5394  *  c-basic-offset: 8
5395  * End:
5396  */