fs/nfs/nfs4proc.c

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