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/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 struct nfs4_opendata;
  76 static int _nfs4_proc_open(struct nfs4_opendata *data);
  77 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  78 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  79 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  80 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  81 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  82                             struct nfs_fattr *fattr, struct iattr *sattr,
  83                             struct nfs4_state *state);
  84 #ifdef CONFIG_NFS_V4_1
  85 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  86 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  87 #endif
  88 /* Prevent leaks of NFSv4 errors into userland */
  89 static int nfs4_map_errors(int err)
  90 {
  91         if (err >= -1000)
  92                 return err;
  93         switch (err) {
  94         case -NFS4ERR_RESOURCE:
  95                 return -EREMOTEIO;
  96         case -NFS4ERR_WRONGSEC:
  97                 return -EPERM;
  98         case -NFS4ERR_BADOWNER:
  99         case -NFS4ERR_BADNAME:
 100                 return -EINVAL;
 101         default:
 102                 dprintk("%s could not handle NFSv4 error %d\n",
 103                                 __func__, -err);
 104                 break;
 105         }
 106         return -EIO;
 107 }
 108
 109 /*
 110  * This is our standard bitmap for GETATTR requests.
 111  */
 112 const u32 nfs4_fattr_bitmap[2] = {
 113         FATTR4_WORD0_TYPE
 114         | FATTR4_WORD0_CHANGE
 115         | FATTR4_WORD0_SIZE
 116         | FATTR4_WORD0_FSID
 117         | FATTR4_WORD0_FILEID,
 118         FATTR4_WORD1_MODE
 119         | FATTR4_WORD1_NUMLINKS
 120         | FATTR4_WORD1_OWNER
 121         | FATTR4_WORD1_OWNER_GROUP
 122         | FATTR4_WORD1_RAWDEV
 123         | FATTR4_WORD1_SPACE_USED
 124         | FATTR4_WORD1_TIME_ACCESS
 125         | FATTR4_WORD1_TIME_METADATA
 126         | FATTR4_WORD1_TIME_MODIFY
 127 };
 128
 129 const u32 nfs4_statfs_bitmap[2] = {
 130         FATTR4_WORD0_FILES_AVAIL
 131         | FATTR4_WORD0_FILES_FREE
 132         | FATTR4_WORD0_FILES_TOTAL,
 133         FATTR4_WORD1_SPACE_AVAIL
 134         | FATTR4_WORD1_SPACE_FREE
 135         | FATTR4_WORD1_SPACE_TOTAL
 136 };
 137
 138 const u32 nfs4_pathconf_bitmap[2] = {
 139         FATTR4_WORD0_MAXLINK
 140         | FATTR4_WORD0_MAXNAME,
 141         0
 142 };
 143
 144 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 145                         | FATTR4_WORD0_MAXREAD
 146                         | FATTR4_WORD0_MAXWRITE
 147                         | FATTR4_WORD0_LEASE_TIME,
 148                         FATTR4_WORD1_TIME_DELTA
 149                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 150                         FATTR4_WORD2_LAYOUT_BLKSIZE
 151 };
 152
 153 const u32 nfs4_fs_locations_bitmap[2] = {
 154         FATTR4_WORD0_TYPE
 155         | FATTR4_WORD0_CHANGE
 156         | FATTR4_WORD0_SIZE
 157         | FATTR4_WORD0_FSID
 158         | FATTR4_WORD0_FILEID
 159         | FATTR4_WORD0_FS_LOCATIONS,
 160         FATTR4_WORD1_MODE
 161         | FATTR4_WORD1_NUMLINKS
 162         | FATTR4_WORD1_OWNER
 163         | FATTR4_WORD1_OWNER_GROUP
 164         | FATTR4_WORD1_RAWDEV
 165         | FATTR4_WORD1_SPACE_USED
 166         | FATTR4_WORD1_TIME_ACCESS
 167         | FATTR4_WORD1_TIME_METADATA
 168         | FATTR4_WORD1_TIME_MODIFY
 169         | FATTR4_WORD1_MOUNTED_ON_FILEID
 170 };
 171
 172 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 173                 struct nfs4_readdir_arg *readdir)
 174 {
 175         __be32 *start, *p;
 176
 177         BUG_ON(readdir->count < 80);
 178         if (cookie > 2) {
 179                 readdir->cookie = cookie;
 180                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 181                 return;
 182         }
 183
 184         readdir->cookie = 0;
 185         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 186         if (cookie == 2)
 187                 return;
 188
 189         /*
 190          * NFSv4 servers do not return entries for '.' and '..'
 191          * Therefore, we fake these entries here.  We let '.'
 192          * have cookie 0 and '..' have cookie 1.  Note that
 193          * when talking to the server, we always send cookie 0
 194          * instead of 1 or 2.
 195          */
 196         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 197
 198         if (cookie == 0) {
 199                 *p++ = xdr_one;                                  /* next */
 200                 *p++ = xdr_zero;                   /* cookie, first word */
 201                 *p++ = xdr_one;                   /* cookie, second word */
 202                 *p++ = xdr_one;                             /* entry len */
 203                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 204                 p++;
 205                 *p++ = xdr_one;                         /* bitmap length */
 206                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 207                 *p++ = htonl(8);              /* attribute buffer length */
 208                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 209         }
 210
 211         *p++ = xdr_one;                                  /* next */
 212         *p++ = xdr_zero;                   /* cookie, first word */
 213         *p++ = xdr_two;                   /* cookie, second word */
 214         *p++ = xdr_two;                             /* entry len */
 215         memcpy(p, "..\0\0", 4);                         /* entry */
 216         p++;
 217         *p++ = xdr_one;                         /* bitmap length */
 218         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 219         *p++ = htonl(8);              /* attribute buffer length */
 220         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 221
 222         readdir->pgbase = (char *)p - (char *)start;
 223         readdir->count -= readdir->pgbase;
 224         kunmap_atomic(start, KM_USER0);
 225 }
 226
 227 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 228 {
 229         int res;
 230
 231         might_sleep();
 232
 233         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 234                         nfs_wait_bit_killable, TASK_KILLABLE);
 235         return res;
 236 }
 237
 238 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 239 {
 240         int res = 0;
 241
 242         might_sleep();
 243
 244         if (*timeout <= 0)
 245                 *timeout = NFS4_POLL_RETRY_MIN;
 246         if (*timeout > NFS4_POLL_RETRY_MAX)
 247                 *timeout = NFS4_POLL_RETRY_MAX;
 248         freezable_schedule_timeout_killable(*timeout);
 249         if (fatal_signal_pending(current))
 250                 res = -ERESTARTSYS;
 251         *timeout <<= 1;
 252         return res;
 253 }
 254
 255 /* This is the error handling routine for processes that are allowed
 256  * to sleep.
 257  */
 258 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 259 {
 260         struct nfs_client *clp = server->nfs_client;
 261         struct nfs4_state *state = exception->state;
 262         int ret = errorcode;
 263
 264         exception->retry = 0;
 265         switch(errorcode) {
 266                 case 0:
 267                         return 0;
 268                 case -NFS4ERR_ADMIN_REVOKED:
 269                 case -NFS4ERR_BAD_STATEID:
 270                 case -NFS4ERR_OPENMODE:
 271                         if (state == NULL)
 272                                 break;
 273                         nfs4_schedule_stateid_recovery(server, state);
 274                         goto wait_on_recovery;
 275                 case -NFS4ERR_EXPIRED:
 276                         if (state != NULL)
 277                                 nfs4_schedule_stateid_recovery(server, state);
 278                 case -NFS4ERR_STALE_STATEID:
 279                 case -NFS4ERR_STALE_CLIENTID:
 280                         nfs4_schedule_lease_recovery(clp);
 281                         goto wait_on_recovery;
 282 #if defined(CONFIG_NFS_V4_1)
 283                 case -NFS4ERR_BADSESSION:
 284                 case -NFS4ERR_BADSLOT:
 285                 case -NFS4ERR_BAD_HIGH_SLOT:
 286                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 287                 case -NFS4ERR_DEADSESSION:
 288                 case -NFS4ERR_SEQ_FALSE_RETRY:
 289                 case -NFS4ERR_SEQ_MISORDERED:
 290                         dprintk("%s ERROR: %d Reset session\n", __func__,
 291                                 errorcode);
 292                         nfs4_schedule_session_recovery(clp->cl_session);
 293                         exception->retry = 1;
 294                         break;
 295 #endif /* defined(CONFIG_NFS_V4_1) */
 296                 case -NFS4ERR_FILE_OPEN:
 297                         if (exception->timeout > HZ) {
 298                                 /* We have retried a decent amount, time to
 299                                  * fail
 300                                  */
 301                                 ret = -EBUSY;
 302                                 break;
 303                         }
 304                 case -NFS4ERR_GRACE:
 305                 case -NFS4ERR_DELAY:
 306                 case -EKEYEXPIRED:
 307                         ret = nfs4_delay(server->client, &exception->timeout);
 308                         if (ret != 0)
 309                                 break;
 310                 case -NFS4ERR_RETRY_UNCACHED_REP:
 311                 case -NFS4ERR_OLD_STATEID:
 312                         exception->retry = 1;
 313                         break;
 314                 case -NFS4ERR_BADOWNER:
 315                         /* The following works around a Linux server bug! */
 316                 case -NFS4ERR_BADNAME:
 317                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 318                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 319                                 exception->retry = 1;
 320                                 printk(KERN_WARNING "NFS: v4 server %s "
 321                                                 "does not accept raw "
 322                                                 "uid/gids. "
 323                                                 "Reenabling the idmapper.\n",
 324                                                 server->nfs_client->cl_hostname);
 325                         }
 326         }
 327         /* We failed to handle the error */
 328         return nfs4_map_errors(ret);
 329 wait_on_recovery:
 330         ret = nfs4_wait_clnt_recover(clp);
 331         if (ret == 0)
 332                 exception->retry = 1;
 333         return ret;
 334 }
 335
 336
 337 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 338 {
 339         spin_lock(&clp->cl_lock);
 340         if (time_before(clp->cl_last_renewal,timestamp))
 341                 clp->cl_last_renewal = timestamp;
 342         spin_unlock(&clp->cl_lock);
 343 }
 344
 345 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 346 {
 347         do_renew_lease(server->nfs_client, timestamp);
 348 }
 349
 350 #if defined(CONFIG_NFS_V4_1)
 351
 352 /*
 353  * nfs4_free_slot - free a slot and efficiently update slot table.
 354  *
 355  * freeing a slot is trivially done by clearing its respective bit
 356  * in the bitmap.
 357  * If the freed slotid equals highest_used_slotid we want to update it
 358  * so that the server would be able to size down the slot table if needed,
 359  * otherwise we know that the highest_used_slotid is still in use.
 360  * When updating highest_used_slotid there may be "holes" in the bitmap
 361  * so we need to scan down from highest_used_slotid to 0 looking for the now
 362  * highest slotid in use.
 363  * If none found, highest_used_slotid is set to -1.
 364  *
 365  * Must be called while holding tbl->slot_tbl_lock
 366  */
 367 static void
 368 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 369 {
 370         int slotid = free_slotid;
 371
 372         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 373         /* clear used bit in bitmap */
 374         __clear_bit(slotid, tbl->used_slots);
 375
 376         /* update highest_used_slotid when it is freed */
 377         if (slotid == tbl->highest_used_slotid) {
 378                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 379                 if (slotid < tbl->max_slots)
 380                         tbl->highest_used_slotid = slotid;
 381                 else
 382                         tbl->highest_used_slotid = -1;
 383         }
 384         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 385                 free_slotid, tbl->highest_used_slotid);
 386 }
 387
 388 /*
 389  * Signal state manager thread if session fore channel is drained
 390  */
 391 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 392 {
 393         struct rpc_task *task;
 394
 395         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 396                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 397                 if (task)
 398                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 399                 return;
 400         }
 401
 402         if (ses->fc_slot_table.highest_used_slotid != -1)
 403                 return;
 404
 405         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 406         complete(&ses->fc_slot_table.complete);
 407 }
 408
 409 /*
 410  * Signal state manager thread if session back channel is drained
 411  */
 412 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 413 {
 414         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 415             ses->bc_slot_table.highest_used_slotid != -1)
 416                 return;
 417         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 418         complete(&ses->bc_slot_table.complete);
 419 }
 420
 421 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 422 {
 423         struct nfs4_slot_table *tbl;
 424
 425         tbl = &res->sr_session->fc_slot_table;
 426         if (!res->sr_slot) {
 427                 /* just wake up the next guy waiting since
 428                  * we may have not consumed a slot after all */
 429                 dprintk("%s: No slot\n", __func__);
 430                 return;
 431         }
 432
 433         spin_lock(&tbl->slot_tbl_lock);
 434         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 435         nfs4_check_drain_fc_complete(res->sr_session);
 436         spin_unlock(&tbl->slot_tbl_lock);
 437         res->sr_slot = NULL;
 438 }
 439
 440 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 441 {
 442         unsigned long timestamp;
 443         struct nfs_client *clp;
 444
 445         /*
 446          * sr_status remains 1 if an RPC level error occurred. The server
 447          * may or may not have processed the sequence operation..
 448          * Proceed as if the server received and processed the sequence
 449          * operation.
 450          */
 451         if (res->sr_status == 1)
 452                 res->sr_status = NFS_OK;
 453
 454         /* don't increment the sequence number if the task wasn't sent */
 455         if (!RPC_WAS_SENT(task))
 456                 goto out;
 457
 458         /* Check the SEQUENCE operation status */
 459         switch (res->sr_status) {
 460         case 0:
 461                 /* Update the slot's sequence and clientid lease timer */
 462                 ++res->sr_slot->seq_nr;
 463                 timestamp = res->sr_renewal_time;
 464                 clp = res->sr_session->clp;
 465                 do_renew_lease(clp, timestamp);
 466                 /* Check sequence flags */
 467                 if (res->sr_status_flags != 0)
 468                         nfs4_schedule_lease_recovery(clp);
 469                 break;
 470         case -NFS4ERR_DELAY:
 471                 /* The server detected a resend of the RPC call and
 472                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 473                  * of RFC5661.
 474                  */
 475                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 476                         __func__,
 477                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 478                         res->sr_slot->seq_nr);
 479                 goto out_retry;
 480         default:
 481                 /* Just update the slot sequence no. */
 482                 ++res->sr_slot->seq_nr;
 483         }
 484 out:
 485         /* The session may be reset by one of the error handlers. */
 486         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 487         nfs41_sequence_free_slot(res);
 488         return 1;
 489 out_retry:
 490         if (!rpc_restart_call(task))
 491                 goto out;
 492         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 493         return 0;
 494 }
 495
 496 static int nfs4_sequence_done(struct rpc_task *task,
 497                                struct nfs4_sequence_res *res)
 498 {
 499         if (res->sr_session == NULL)
 500                 return 1;
 501         return nfs41_sequence_done(task, res);
 502 }
 503
 504 /*
 505  * nfs4_find_slot - efficiently look for a free slot
 506  *
 507  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 508  * If found, we mark the slot as used, update the highest_used_slotid,
 509  * and respectively set up the sequence operation args.
 510  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 511  *
 512  * Note: must be called with under the slot_tbl_lock.
 513  */
 514 static u8
 515 nfs4_find_slot(struct nfs4_slot_table *tbl)
 516 {
 517         int slotid;
 518         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 519         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 520
 521         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 522                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 523                 tbl->max_slots);
 524         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 525         if (slotid >= tbl->max_slots)
 526                 goto out;
 527         __set_bit(slotid, tbl->used_slots);
 528         if (slotid > tbl->highest_used_slotid)
 529                 tbl->highest_used_slotid = slotid;
 530         ret_id = slotid;
 531 out:
 532         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 533                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 534         return ret_id;
 535 }
 536
 537 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 538                 struct nfs4_sequence_res *res, int cache_reply)
 539 {
 540         args->sa_session = NULL;
 541         args->sa_cache_this = 0;
 542         if (cache_reply)
 543                 args->sa_cache_this = 1;
 544         res->sr_session = NULL;
 545         res->sr_slot = NULL;
 546 }
 547
 548 int nfs41_setup_sequence(struct nfs4_session *session,
 549                                 struct nfs4_sequence_args *args,
 550                                 struct nfs4_sequence_res *res,
 551                                 struct rpc_task *task)
 552 {
 553         struct nfs4_slot *slot;
 554         struct nfs4_slot_table *tbl;
 555         u8 slotid;
 556
 557         dprintk("--> %s\n", __func__);
 558         /* slot already allocated? */
 559         if (res->sr_slot != NULL)
 560                 return 0;
 561
 562         tbl = &session->fc_slot_table;
 563
 564         spin_lock(&tbl->slot_tbl_lock);
 565         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 566             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 567                 /* The state manager will wait until the slot table is empty */
 568                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 569                 spin_unlock(&tbl->slot_tbl_lock);
 570                 dprintk("%s session is draining\n", __func__);
 571                 return -EAGAIN;
 572         }
 573
 574         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 575             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 576                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 577                 spin_unlock(&tbl->slot_tbl_lock);
 578                 dprintk("%s enforce FIFO order\n", __func__);
 579                 return -EAGAIN;
 580         }
 581
 582         slotid = nfs4_find_slot(tbl);
 583         if (slotid == NFS4_MAX_SLOT_TABLE) {
 584                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 585                 spin_unlock(&tbl->slot_tbl_lock);
 586                 dprintk("<-- %s: no free slots\n", __func__);
 587                 return -EAGAIN;
 588         }
 589         spin_unlock(&tbl->slot_tbl_lock);
 590
 591         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 592         slot = tbl->slots + slotid;
 593         args->sa_session = session;
 594         args->sa_slotid = slotid;
 595
 596         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 597
 598         res->sr_session = session;
 599         res->sr_slot = slot;
 600         res->sr_renewal_time = jiffies;
 601         res->sr_status_flags = 0;
 602         /*
 603          * sr_status is only set in decode_sequence, and so will remain
 604          * set to 1 if an rpc level failure occurs.
 605          */
 606         res->sr_status = 1;
 607         return 0;
 608 }
 609 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 610
 611 int nfs4_setup_sequence(const struct nfs_server *server,
 612                         struct nfs4_sequence_args *args,
 613                         struct nfs4_sequence_res *res,
 614                         struct rpc_task *task)
 615 {
 616         struct nfs4_session *session = nfs4_get_session(server);
 617         int ret = 0;
 618
 619         if (session == NULL)
 620                 goto out;
 621
 622         dprintk("--> %s clp %p session %p sr_slot %td\n",
 623                 __func__, session->clp, session, res->sr_slot ?
 624                         res->sr_slot - session->fc_slot_table.slots : -1);
 625
 626         ret = nfs41_setup_sequence(session, args, res, task);
 627 out:
 628         dprintk("<-- %s status=%d\n", __func__, ret);
 629         return ret;
 630 }
 631
 632 struct nfs41_call_sync_data {
 633         const struct nfs_server *seq_server;
 634         struct nfs4_sequence_args *seq_args;
 635         struct nfs4_sequence_res *seq_res;
 636 };
 637
 638 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 639 {
 640         struct nfs41_call_sync_data *data = calldata;
 641
 642         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 643
 644         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 645                                 data->seq_res, task))
 646                 return;
 647         rpc_call_start(task);
 648 }
 649
 650 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 651 {
 652         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 653         nfs41_call_sync_prepare(task, calldata);
 654 }
 655
 656 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 657 {
 658         struct nfs41_call_sync_data *data = calldata;
 659
 660         nfs41_sequence_done(task, data->seq_res);
 661 }
 662
 663 struct rpc_call_ops nfs41_call_sync_ops = {
 664         .rpc_call_prepare = nfs41_call_sync_prepare,
 665         .rpc_call_done = nfs41_call_sync_done,
 666 };
 667
 668 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 669         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 670         .rpc_call_done = nfs41_call_sync_done,
 671 };
 672
 673 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 674                                    struct nfs_server *server,
 675                                    struct rpc_message *msg,
 676                                    struct nfs4_sequence_args *args,
 677                                    struct nfs4_sequence_res *res,
 678                                    int privileged)
 679 {
 680         int ret;
 681         struct rpc_task *task;
 682         struct nfs41_call_sync_data data = {
 683                 .seq_server = server,
 684                 .seq_args = args,
 685                 .seq_res = res,
 686         };
 687         struct rpc_task_setup task_setup = {
 688                 .rpc_client = clnt,
 689                 .rpc_message = msg,
 690                 .callback_ops = &nfs41_call_sync_ops,
 691                 .callback_data = &data
 692         };
 693
 694         if (privileged)
 695                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 696         task = rpc_run_task(&task_setup);
 697         if (IS_ERR(task))
 698                 ret = PTR_ERR(task);
 699         else {
 700                 ret = task->tk_status;
 701                 rpc_put_task(task);
 702         }
 703         return ret;
 704 }
 705
 706 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 707                             struct nfs_server *server,
 708                             struct rpc_message *msg,
 709                             struct nfs4_sequence_args *args,
 710                             struct nfs4_sequence_res *res,
 711                             int cache_reply)
 712 {
 713         nfs41_init_sequence(args, res, cache_reply);
 714         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 715 }
 716
 717 #else
 718 static inline
 719 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 720                 struct nfs4_sequence_res *res, int cache_reply)
 721 {
 722 }
 723
 724 static int nfs4_sequence_done(struct rpc_task *task,
 725                                struct nfs4_sequence_res *res)
 726 {
 727         return 1;
 728 }
 729 #endif /* CONFIG_NFS_V4_1 */
 730
 731 int _nfs4_call_sync(struct rpc_clnt *clnt,
 732                     struct nfs_server *server,
 733                     struct rpc_message *msg,
 734                     struct nfs4_sequence_args *args,
 735                     struct nfs4_sequence_res *res,
 736                     int cache_reply)
 737 {
 738         nfs41_init_sequence(args, res, cache_reply);
 739         return rpc_call_sync(clnt, msg, 0);
 740 }
 741
 742 static inline
 743 int nfs4_call_sync(struct rpc_clnt *clnt,
 744                    struct nfs_server *server,
 745                    struct rpc_message *msg,
 746                    struct nfs4_sequence_args *args,
 747                    struct nfs4_sequence_res *res,
 748                    int cache_reply)
 749 {
 750         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 751                                                 args, res, cache_reply);
 752 }
 753
 754 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 755 {
 756         struct nfs_inode *nfsi = NFS_I(dir);
 757
 758         spin_lock(&dir->i_lock);
 759         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 760         if (!cinfo->atomic || cinfo->before != dir->i_version)
 761                 nfs_force_lookup_revalidate(dir);
 762         dir->i_version = cinfo->after;
 763         spin_unlock(&dir->i_lock);
 764 }
 765
 766 struct nfs4_opendata {
 767         struct kref kref;
 768         struct nfs_openargs o_arg;
 769         struct nfs_openres o_res;
 770         struct nfs_open_confirmargs c_arg;
 771         struct nfs_open_confirmres c_res;
 772         struct nfs4_string owner_name;
 773         struct nfs4_string group_name;
 774         struct nfs_fattr f_attr;
 775         struct nfs_fattr dir_attr;
 776         struct dentry *dir;
 777         struct dentry *dentry;
 778         struct nfs4_state_owner *owner;
 779         struct nfs4_state *state;
 780         struct iattr attrs;
 781         unsigned long timestamp;
 782         unsigned int rpc_done : 1;
 783         int rpc_status;
 784         int cancelled;
 785 };
 786
 787
 788 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 789 {
 790         p->o_res.f_attr = &p->f_attr;
 791         p->o_res.dir_attr = &p->dir_attr;
 792         p->o_res.seqid = p->o_arg.seqid;
 793         p->c_res.seqid = p->c_arg.seqid;
 794         p->o_res.server = p->o_arg.server;
 795         nfs_fattr_init(&p->f_attr);
 796         nfs_fattr_init(&p->dir_attr);
 797         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 798 }
 799
 800 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 801                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 802                 const struct iattr *attrs,
 803                 gfp_t gfp_mask)
 804 {
 805         struct dentry *parent = dget_parent(dentry);
 806         struct inode *dir = parent->d_inode;
 807         struct nfs_server *server = NFS_SERVER(dir);
 808         struct nfs4_opendata *p;
 809
 810         p = kzalloc(sizeof(*p), gfp_mask);
 811         if (p == NULL)
 812                 goto err;
 813         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 814         if (p->o_arg.seqid == NULL)
 815                 goto err_free;
 816         nfs_sb_active(dentry->d_sb);
 817         p->dentry = dget(dentry);
 818         p->dir = parent;
 819         p->owner = sp;
 820         atomic_inc(&sp->so_count);
 821         p->o_arg.fh = NFS_FH(dir);
 822         p->o_arg.open_flags = flags;
 823         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 824         p->o_arg.clientid = server->nfs_client->cl_clientid;
 825         p->o_arg.id = sp->so_seqid.owner_id;
 826         p->o_arg.name = &dentry->d_name;
 827         p->o_arg.server = server;
 828         p->o_arg.bitmask = server->attr_bitmask;
 829         p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
 830         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 831         if (attrs != NULL && attrs->ia_valid != 0) {
 832                 u32 *s;
 833
 834                 p->o_arg.u.attrs = &p->attrs;
 835                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 836                 s = (u32 *) p->o_arg.u.verifier.data;
 837                 s[0] = jiffies;
 838                 s[1] = current->pid;
 839         }
 840         p->c_arg.fh = &p->o_res.fh;
 841         p->c_arg.stateid = &p->o_res.stateid;
 842         p->c_arg.seqid = p->o_arg.seqid;
 843         nfs4_init_opendata_res(p);
 844         kref_init(&p->kref);
 845         return p;
 846 err_free:
 847         kfree(p);
 848 err:
 849         dput(parent);
 850         return NULL;
 851 }
 852
 853 static void nfs4_opendata_free(struct kref *kref)
 854 {
 855         struct nfs4_opendata *p = container_of(kref,
 856                         struct nfs4_opendata, kref);
 857         struct super_block *sb = p->dentry->d_sb;
 858
 859         nfs_free_seqid(p->o_arg.seqid);
 860         if (p->state != NULL)
 861                 nfs4_put_open_state(p->state);
 862         nfs4_put_state_owner(p->owner);
 863         dput(p->dir);
 864         dput(p->dentry);
 865         nfs_sb_deactive(sb);
 866         nfs_fattr_free_names(&p->f_attr);
 867         kfree(p);
 868 }
 869
 870 static void nfs4_opendata_put(struct nfs4_opendata *p)
 871 {
 872         if (p != NULL)
 873                 kref_put(&p->kref, nfs4_opendata_free);
 874 }
 875
 876 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 877 {
 878         int ret;
 879
 880         ret = rpc_wait_for_completion_task(task);
 881         return ret;
 882 }
 883
 884 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 885 {
 886         int ret = 0;
 887
 888         if (open_mode & (O_EXCL|O_TRUNC))
 889                 goto out;
 890         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 891                 case FMODE_READ:
 892                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 893                                 && state->n_rdonly != 0;
 894                         break;
 895                 case FMODE_WRITE:
 896                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 897                                 && state->n_wronly != 0;
 898                         break;
 899                 case FMODE_READ|FMODE_WRITE:
 900                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 901                                 && state->n_rdwr != 0;
 902         }
 903 out:
 904         return ret;
 905 }
 906
 907 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 908 {
 909         if (delegation == NULL)
 910                 return 0;
 911         if ((delegation->type & fmode) != fmode)
 912                 return 0;
 913         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 914                 return 0;
 915         nfs_mark_delegation_referenced(delegation);
 916         return 1;
 917 }
 918
 919 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 920 {
 921         switch (fmode) {
 922                 case FMODE_WRITE:
 923                         state->n_wronly++;
 924                         break;
 925                 case FMODE_READ:
 926                         state->n_rdonly++;
 927                         break;
 928                 case FMODE_READ|FMODE_WRITE:
 929                         state->n_rdwr++;
 930         }
 931         nfs4_state_set_mode_locked(state, state->state | fmode);
 932 }
 933
 934 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 935 {
 936         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 937                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 938         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 939         switch (fmode) {
 940                 case FMODE_READ:
 941                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 942                         break;
 943                 case FMODE_WRITE:
 944                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 945                         break;
 946                 case FMODE_READ|FMODE_WRITE:
 947                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 948         }
 949 }
 950
 951 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 952 {
 953         write_seqlock(&state->seqlock);
 954         nfs_set_open_stateid_locked(state, stateid, fmode);
 955         write_sequnlock(&state->seqlock);
 956 }
 957
 958 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 959 {
 960         /*
 961          * Protect the call to nfs4_state_set_mode_locked and
 962          * serialise the stateid update
 963          */
 964         write_seqlock(&state->seqlock);
 965         if (deleg_stateid != NULL) {
 966                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 967                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 968         }
 969         if (open_stateid != NULL)
 970                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 971         write_sequnlock(&state->seqlock);
 972         spin_lock(&state->owner->so_lock);
 973         update_open_stateflags(state, fmode);
 974         spin_unlock(&state->owner->so_lock);
 975 }
 976
 977 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 978 {
 979         struct nfs_inode *nfsi = NFS_I(state->inode);
 980         struct nfs_delegation *deleg_cur;
 981         int ret = 0;
 982
 983         fmode &= (FMODE_READ|FMODE_WRITE);
 984
 985         rcu_read_lock();
 986         deleg_cur = rcu_dereference(nfsi->delegation);
 987         if (deleg_cur == NULL)
 988                 goto no_delegation;
 989
 990         spin_lock(&deleg_cur->lock);
 991         if (nfsi->delegation != deleg_cur ||
 992             (deleg_cur->type & fmode) != fmode)
 993                 goto no_delegation_unlock;
 994
 995         if (delegation == NULL)
 996                 delegation = &deleg_cur->stateid;
 997         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 998                 goto no_delegation_unlock;
 999
1000         nfs_mark_delegation_referenced(deleg_cur);
1001         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1002         ret = 1;
1003 no_delegation_unlock:
1004         spin_unlock(&deleg_cur->lock);
1005 no_delegation:
1006         rcu_read_unlock();
1007
1008         if (!ret && open_stateid != NULL) {
1009                 __update_open_stateid(state, open_stateid, NULL, fmode);
1010                 ret = 1;
1011         }
1012
1013         return ret;
1014 }
1015
1016
1017 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1018 {
1019         struct nfs_delegation *delegation;
1020
1021         rcu_read_lock();
1022         delegation = rcu_dereference(NFS_I(inode)->delegation);
1023         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1024                 rcu_read_unlock();
1025                 return;
1026         }
1027         rcu_read_unlock();
1028         nfs_inode_return_delegation(inode);
1029 }
1030
1031 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1032 {
1033         struct nfs4_state *state = opendata->state;
1034         struct nfs_inode *nfsi = NFS_I(state->inode);
1035         struct nfs_delegation *delegation;
1036         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1037         fmode_t fmode = opendata->o_arg.fmode;
1038         nfs4_stateid stateid;
1039         int ret = -EAGAIN;
1040
1041         for (;;) {
1042                 if (can_open_cached(state, fmode, open_mode)) {
1043                         spin_lock(&state->owner->so_lock);
1044                         if (can_open_cached(state, fmode, open_mode)) {
1045                                 update_open_stateflags(state, fmode);
1046                                 spin_unlock(&state->owner->so_lock);
1047                                 goto out_return_state;
1048                         }
1049                         spin_unlock(&state->owner->so_lock);
1050                 }
1051                 rcu_read_lock();
1052                 delegation = rcu_dereference(nfsi->delegation);
1053                 if (!can_open_delegated(delegation, fmode)) {
1054                         rcu_read_unlock();
1055                         break;
1056                 }
1057                 /* Save the delegation */
1058                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1059                 rcu_read_unlock();
1060                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1061                 if (ret != 0)
1062                         goto out;
1063                 ret = -EAGAIN;
1064
1065                 /* Try to update the stateid using the delegation */
1066                 if (update_open_stateid(state, NULL, &stateid, fmode))
1067                         goto out_return_state;
1068         }
1069 out:
1070         return ERR_PTR(ret);
1071 out_return_state:
1072         atomic_inc(&state->count);
1073         return state;
1074 }
1075
1076 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1077 {
1078         struct inode *inode;
1079         struct nfs4_state *state = NULL;
1080         struct nfs_delegation *delegation;
1081         int ret;
1082
1083         if (!data->rpc_done) {
1084                 state = nfs4_try_open_cached(data);
1085                 goto out;
1086         }
1087
1088         ret = -EAGAIN;
1089         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1090                 goto err;
1091         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1092         ret = PTR_ERR(inode);
1093         if (IS_ERR(inode))
1094                 goto err;
1095         ret = -ENOMEM;
1096         state = nfs4_get_open_state(inode, data->owner);
1097         if (state == NULL)
1098                 goto err_put_inode;
1099         if (data->o_res.delegation_type != 0) {
1100                 int delegation_flags = 0;
1101
1102                 rcu_read_lock();
1103                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1104                 if (delegation)
1105                         delegation_flags = delegation->flags;
1106                 rcu_read_unlock();
1107                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1108                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1109                                         "returning a delegation for "
1110                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1111                                         NFS_CLIENT(inode)->cl_server);
1112                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1113                         nfs_inode_set_delegation(state->inode,
1114                                         data->owner->so_cred,
1115                                         &data->o_res);
1116                 else
1117                         nfs_inode_reclaim_delegation(state->inode,
1118                                         data->owner->so_cred,
1119                                         &data->o_res);
1120         }
1121
1122         update_open_stateid(state, &data->o_res.stateid, NULL,
1123                         data->o_arg.fmode);
1124         iput(inode);
1125 out:
1126         return state;
1127 err_put_inode:
1128         iput(inode);
1129 err:
1130         return ERR_PTR(ret);
1131 }
1132
1133 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1134 {
1135         struct nfs_inode *nfsi = NFS_I(state->inode);
1136         struct nfs_open_context *ctx;
1137
1138         spin_lock(&state->inode->i_lock);
1139         list_for_each_entry(ctx, &nfsi->open_files, list) {
1140                 if (ctx->state != state)
1141                         continue;
1142                 get_nfs_open_context(ctx);
1143                 spin_unlock(&state->inode->i_lock);
1144                 return ctx;
1145         }
1146         spin_unlock(&state->inode->i_lock);
1147         return ERR_PTR(-ENOENT);
1148 }
1149
1150 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1151 {
1152         struct nfs4_opendata *opendata;
1153
1154         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1155         if (opendata == NULL)
1156                 return ERR_PTR(-ENOMEM);
1157         opendata->state = state;
1158         atomic_inc(&state->count);
1159         return opendata;
1160 }
1161
1162 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1163 {
1164         struct nfs4_state *newstate;
1165         int ret;
1166
1167         opendata->o_arg.open_flags = 0;
1168         opendata->o_arg.fmode = fmode;
1169         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1170         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1171         nfs4_init_opendata_res(opendata);
1172         ret = _nfs4_recover_proc_open(opendata);
1173         if (ret != 0)
1174                 return ret;
1175         newstate = nfs4_opendata_to_nfs4_state(opendata);
1176         if (IS_ERR(newstate))
1177                 return PTR_ERR(newstate);
1178         nfs4_close_state(newstate, fmode);
1179         *res = newstate;
1180         return 0;
1181 }
1182
1183 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1184 {
1185         struct nfs4_state *newstate;
1186         int ret;
1187
1188         /* memory barrier prior to reading state->n_* */
1189         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1190         smp_rmb();
1191         if (state->n_rdwr != 0) {
1192                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1193                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1194                 if (ret != 0)
1195                         return ret;
1196                 if (newstate != state)
1197                         return -ESTALE;
1198         }
1199         if (state->n_wronly != 0) {
1200                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1201                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1202                 if (ret != 0)
1203                         return ret;
1204                 if (newstate != state)
1205                         return -ESTALE;
1206         }
1207         if (state->n_rdonly != 0) {
1208                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1209                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1210                 if (ret != 0)
1211                         return ret;
1212                 if (newstate != state)
1213                         return -ESTALE;
1214         }
1215         /*
1216          * We may have performed cached opens for all three recoveries.
1217          * Check if we need to update the current stateid.
1218          */
1219         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1220             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1221                 write_seqlock(&state->seqlock);
1222                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1223                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1224                 write_sequnlock(&state->seqlock);
1225         }
1226         return 0;
1227 }
1228
1229 /*
1230  * OPEN_RECLAIM:
1231  *      reclaim state on the server after a reboot.
1232  */
1233 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1234 {
1235         struct nfs_delegation *delegation;
1236         struct nfs4_opendata *opendata;
1237         fmode_t delegation_type = 0;
1238         int status;
1239
1240         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1241         if (IS_ERR(opendata))
1242                 return PTR_ERR(opendata);
1243         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1244         opendata->o_arg.fh = NFS_FH(state->inode);
1245         rcu_read_lock();
1246         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1247         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1248                 delegation_type = delegation->type;
1249         rcu_read_unlock();
1250         opendata->o_arg.u.delegation_type = delegation_type;
1251         status = nfs4_open_recover(opendata, state);
1252         nfs4_opendata_put(opendata);
1253         return status;
1254 }
1255
1256 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1257 {
1258         struct nfs_server *server = NFS_SERVER(state->inode);
1259         struct nfs4_exception exception = { };
1260         int err;
1261         do {
1262                 err = _nfs4_do_open_reclaim(ctx, state);
1263                 if (err != -NFS4ERR_DELAY)
1264                         break;
1265                 nfs4_handle_exception(server, err, &exception);
1266         } while (exception.retry);
1267         return err;
1268 }
1269
1270 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1271 {
1272         struct nfs_open_context *ctx;
1273         int ret;
1274
1275         ctx = nfs4_state_find_open_context(state);
1276         if (IS_ERR(ctx))
1277                 return PTR_ERR(ctx);
1278         ret = nfs4_do_open_reclaim(ctx, state);
1279         put_nfs_open_context(ctx);
1280         return ret;
1281 }
1282
1283 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1284 {
1285         struct nfs4_opendata *opendata;
1286         int ret;
1287
1288         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1289         if (IS_ERR(opendata))
1290                 return PTR_ERR(opendata);
1291         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1292         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1293                         sizeof(opendata->o_arg.u.delegation.data));
1294         ret = nfs4_open_recover(opendata, state);
1295         nfs4_opendata_put(opendata);
1296         return ret;
1297 }
1298
1299 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1300 {
1301         struct nfs4_exception exception = { };
1302         struct nfs_server *server = NFS_SERVER(state->inode);
1303         int err;
1304         do {
1305                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1306                 switch (err) {
1307                         case 0:
1308                         case -ENOENT:
1309                         case -ESTALE:
1310                                 goto out;
1311                         case -NFS4ERR_BADSESSION:
1312                         case -NFS4ERR_BADSLOT:
1313                         case -NFS4ERR_BAD_HIGH_SLOT:
1314                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1315                         case -NFS4ERR_DEADSESSION:
1316                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1317                                 goto out;
1318                         case -NFS4ERR_STALE_CLIENTID:
1319                         case -NFS4ERR_STALE_STATEID:
1320                         case -NFS4ERR_EXPIRED:
1321                                 /* Don't recall a delegation if it was lost */
1322                                 nfs4_schedule_lease_recovery(server->nfs_client);
1323                                 goto out;
1324                         case -ERESTARTSYS:
1325                                 /*
1326                                  * The show must go on: exit, but mark the
1327                                  * stateid as needing recovery.
1328                                  */
1329                         case -NFS4ERR_ADMIN_REVOKED:
1330                         case -NFS4ERR_BAD_STATEID:
1331                                 nfs4_schedule_stateid_recovery(server, state);
1332                         case -EKEYEXPIRED:
1333                                 /*
1334                                  * User RPCSEC_GSS context has expired.
1335                                  * We cannot recover this stateid now, so
1336                                  * skip it and allow recovery thread to
1337                                  * proceed.
1338                                  */
1339                         case -ENOMEM:
1340                                 err = 0;
1341                                 goto out;
1342                 }
1343                 err = nfs4_handle_exception(server, err, &exception);
1344         } while (exception.retry);
1345 out:
1346         return err;
1347 }
1348
1349 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1350 {
1351         struct nfs4_opendata *data = calldata;
1352
1353         data->rpc_status = task->tk_status;
1354         if (data->rpc_status == 0) {
1355                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1356                                 sizeof(data->o_res.stateid.data));
1357                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1358                 renew_lease(data->o_res.server, data->timestamp);
1359                 data->rpc_done = 1;
1360         }
1361 }
1362
1363 static void nfs4_open_confirm_release(void *calldata)
1364 {
1365         struct nfs4_opendata *data = calldata;
1366         struct nfs4_state *state = NULL;
1367
1368         /* If this request hasn't been cancelled, do nothing */
1369         if (data->cancelled == 0)
1370                 goto out_free;
1371         /* In case of error, no cleanup! */
1372         if (!data->rpc_done)
1373                 goto out_free;
1374         state = nfs4_opendata_to_nfs4_state(data);
1375         if (!IS_ERR(state))
1376                 nfs4_close_state(state, data->o_arg.fmode);
1377 out_free:
1378         nfs4_opendata_put(data);
1379 }
1380
1381 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1382         .rpc_call_done = nfs4_open_confirm_done,
1383         .rpc_release = nfs4_open_confirm_release,
1384 };
1385
1386 /*
1387  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1388  */
1389 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1390 {
1391         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1392         struct rpc_task *task;
1393         struct  rpc_message msg = {
1394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1395                 .rpc_argp = &data->c_arg,
1396                 .rpc_resp = &data->c_res,
1397                 .rpc_cred = data->owner->so_cred,
1398         };
1399         struct rpc_task_setup task_setup_data = {
1400                 .rpc_client = server->client,
1401                 .rpc_message = &msg,
1402                 .callback_ops = &nfs4_open_confirm_ops,
1403                 .callback_data = data,
1404                 .workqueue = nfsiod_workqueue,
1405                 .flags = RPC_TASK_ASYNC,
1406         };
1407         int status;
1408
1409         kref_get(&data->kref);
1410         data->rpc_done = 0;
1411         data->rpc_status = 0;
1412         data->timestamp = jiffies;
1413         task = rpc_run_task(&task_setup_data);
1414         if (IS_ERR(task))
1415                 return PTR_ERR(task);
1416         status = nfs4_wait_for_completion_rpc_task(task);
1417         if (status != 0) {
1418                 data->cancelled = 1;
1419                 smp_wmb();
1420         } else
1421                 status = data->rpc_status;
1422         rpc_put_task(task);
1423         return status;
1424 }
1425
1426 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1427 {
1428         struct nfs4_opendata *data = calldata;
1429         struct nfs4_state_owner *sp = data->owner;
1430
1431         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1432                 return;
1433         /*
1434          * Check if we still need to send an OPEN call, or if we can use
1435          * a delegation instead.
1436          */
1437         if (data->state != NULL) {
1438                 struct nfs_delegation *delegation;
1439
1440                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1441                         goto out_no_action;
1442                 rcu_read_lock();
1443                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1444                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1445                     can_open_delegated(delegation, data->o_arg.fmode))
1446                         goto unlock_no_action;
1447                 rcu_read_unlock();
1448         }
1449         /* Update sequence id. */
1450         data->o_arg.id = sp->so_seqid.owner_id;
1451         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1452         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1453                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1454                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1455         }
1456         data->timestamp = jiffies;
1457         if (nfs4_setup_sequence(data->o_arg.server,
1458                                 &data->o_arg.seq_args,
1459                                 &data->o_res.seq_res, task))
1460                 return;
1461         rpc_call_start(task);
1462         return;
1463 unlock_no_action:
1464         rcu_read_unlock();
1465 out_no_action:
1466         task->tk_action = NULL;
1467
1468 }
1469
1470 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1471 {
1472         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1473         nfs4_open_prepare(task, calldata);
1474 }
1475
1476 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1477 {
1478         struct nfs4_opendata *data = calldata;
1479
1480         data->rpc_status = task->tk_status;
1481
1482         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1483                 return;
1484
1485         if (task->tk_status == 0) {
1486                 switch (data->o_res.f_attr->mode & S_IFMT) {
1487                         case S_IFREG:
1488                                 break;
1489                         case S_IFLNK:
1490                                 data->rpc_status = -ELOOP;
1491                                 break;
1492                         case S_IFDIR:
1493                                 data->rpc_status = -EISDIR;
1494                                 break;
1495                         default:
1496                                 data->rpc_status = -ENOTDIR;
1497                 }
1498                 renew_lease(data->o_res.server, data->timestamp);
1499                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1500                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1501         }
1502         data->rpc_done = 1;
1503 }
1504
1505 static void nfs4_open_release(void *calldata)
1506 {
1507         struct nfs4_opendata *data = calldata;
1508         struct nfs4_state *state = NULL;
1509
1510         /* If this request hasn't been cancelled, do nothing */
1511         if (data->cancelled == 0)
1512                 goto out_free;
1513         /* In case of error, no cleanup! */
1514         if (data->rpc_status != 0 || !data->rpc_done)
1515                 goto out_free;
1516         /* In case we need an open_confirm, no cleanup! */
1517         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1518                 goto out_free;
1519         state = nfs4_opendata_to_nfs4_state(data);
1520         if (!IS_ERR(state))
1521                 nfs4_close_state(state, data->o_arg.fmode);
1522 out_free:
1523         nfs4_opendata_put(data);
1524 }
1525
1526 static const struct rpc_call_ops nfs4_open_ops = {
1527         .rpc_call_prepare = nfs4_open_prepare,
1528         .rpc_call_done = nfs4_open_done,
1529         .rpc_release = nfs4_open_release,
1530 };
1531
1532 static const struct rpc_call_ops nfs4_recover_open_ops = {
1533         .rpc_call_prepare = nfs4_recover_open_prepare,
1534         .rpc_call_done = nfs4_open_done,
1535         .rpc_release = nfs4_open_release,
1536 };
1537
1538 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1539 {
1540         struct inode *dir = data->dir->d_inode;
1541         struct nfs_server *server = NFS_SERVER(dir);
1542         struct nfs_openargs *o_arg = &data->o_arg;
1543         struct nfs_openres *o_res = &data->o_res;
1544         struct rpc_task *task;
1545         struct rpc_message msg = {
1546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1547                 .rpc_argp = o_arg,
1548                 .rpc_resp = o_res,
1549                 .rpc_cred = data->owner->so_cred,
1550         };
1551         struct rpc_task_setup task_setup_data = {
1552                 .rpc_client = server->client,
1553                 .rpc_message = &msg,
1554                 .callback_ops = &nfs4_open_ops,
1555                 .callback_data = data,
1556                 .workqueue = nfsiod_workqueue,
1557                 .flags = RPC_TASK_ASYNC,
1558         };
1559         int status;
1560
1561         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1562         kref_get(&data->kref);
1563         data->rpc_done = 0;
1564         data->rpc_status = 0;
1565         data->cancelled = 0;
1566         if (isrecover)
1567                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1568         task = rpc_run_task(&task_setup_data);
1569         if (IS_ERR(task))
1570                 return PTR_ERR(task);
1571         status = nfs4_wait_for_completion_rpc_task(task);
1572         if (status != 0) {
1573                 data->cancelled = 1;
1574                 smp_wmb();
1575         } else
1576                 status = data->rpc_status;
1577         rpc_put_task(task);
1578
1579         return status;
1580 }
1581
1582 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1583 {
1584         struct inode *dir = data->dir->d_inode;
1585         struct nfs_openres *o_res = &data->o_res;
1586         int status;
1587
1588         status = nfs4_run_open_task(data, 1);
1589         if (status != 0 || !data->rpc_done)
1590                 return status;
1591
1592         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1593
1594         nfs_refresh_inode(dir, o_res->dir_attr);
1595
1596         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1597                 status = _nfs4_proc_open_confirm(data);
1598                 if (status != 0)
1599                         return status;
1600         }
1601
1602         return status;
1603 }
1604
1605 /*
1606  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1607  */
1608 static int _nfs4_proc_open(struct nfs4_opendata *data)
1609 {
1610         struct inode *dir = data->dir->d_inode;
1611         struct nfs_server *server = NFS_SERVER(dir);
1612         struct nfs_openargs *o_arg = &data->o_arg;
1613         struct nfs_openres *o_res = &data->o_res;
1614         int status;
1615
1616         status = nfs4_run_open_task(data, 0);
1617         if (!data->rpc_done)
1618                 return status;
1619         if (status != 0) {
1620                 if (status == -NFS4ERR_BADNAME &&
1621                                 !(o_arg->open_flags & O_CREAT))
1622                         return -ENOENT;
1623                 return status;
1624         }
1625
1626         nfs_fattr_map_and_free_names(server, &data->f_attr);
1627
1628         if (o_arg->open_flags & O_CREAT) {
1629                 update_changeattr(dir, &o_res->cinfo);
1630                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1631         } else
1632                 nfs_refresh_inode(dir, o_res->dir_attr);
1633         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1634                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1635         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1636                 status = _nfs4_proc_open_confirm(data);
1637                 if (status != 0)
1638                         return status;
1639         }
1640         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1641                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1642         return 0;
1643 }
1644
1645 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1646 {
1647         unsigned int loop;
1648         int ret;
1649
1650         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1651                 ret = nfs4_wait_clnt_recover(clp);
1652                 if (ret != 0)
1653                         break;
1654                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1655                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1656                         break;
1657                 nfs4_schedule_state_manager(clp);
1658                 ret = -EIO;
1659         }
1660         return ret;
1661 }
1662
1663 static int nfs4_recover_expired_lease(struct nfs_server *server)
1664 {
1665         return nfs4_client_recover_expired_lease(server->nfs_client);
1666 }
1667
1668 /*
1669  * OPEN_EXPIRED:
1670  *      reclaim state on the server after a network partition.
1671  *      Assumes caller holds the appropriate lock
1672  */
1673 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1674 {
1675         struct nfs4_opendata *opendata;
1676         int ret;
1677
1678         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1679         if (IS_ERR(opendata))
1680                 return PTR_ERR(opendata);
1681         ret = nfs4_open_recover(opendata, state);
1682         if (ret == -ESTALE)
1683                 d_drop(ctx->dentry);
1684         nfs4_opendata_put(opendata);
1685         return ret;
1686 }
1687
1688 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1689 {
1690         struct nfs_server *server = NFS_SERVER(state->inode);
1691         struct nfs4_exception exception = { };
1692         int err;
1693
1694         do {
1695                 err = _nfs4_open_expired(ctx, state);
1696                 switch (err) {
1697                 default:
1698                         goto out;
1699                 case -NFS4ERR_GRACE:
1700                 case -NFS4ERR_DELAY:
1701                         nfs4_handle_exception(server, err, &exception);
1702                         err = 0;
1703                 }
1704         } while (exception.retry);
1705 out:
1706         return err;
1707 }
1708
1709 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1710 {
1711         struct nfs_open_context *ctx;
1712         int ret;
1713
1714         ctx = nfs4_state_find_open_context(state);
1715         if (IS_ERR(ctx))
1716                 return PTR_ERR(ctx);
1717         ret = nfs4_do_open_expired(ctx, state);
1718         put_nfs_open_context(ctx);
1719         return ret;
1720 }
1721
1722 #if defined(CONFIG_NFS_V4_1)
1723 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1724 {
1725         int status;
1726         struct nfs_server *server = NFS_SERVER(state->inode);
1727
1728         status = nfs41_test_stateid(server, state);
1729         if (status == NFS_OK)
1730                 return 0;
1731         nfs41_free_stateid(server, state);
1732         return nfs4_open_expired(sp, state);
1733 }
1734 #endif
1735
1736 /*
1737  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1738  * fields corresponding to attributes that were used to store the verifier.
1739  * Make sure we clobber those fields in the later setattr call
1740  */
1741 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1742 {
1743         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1744             !(sattr->ia_valid & ATTR_ATIME_SET))
1745                 sattr->ia_valid |= ATTR_ATIME;
1746
1747         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1748             !(sattr->ia_valid & ATTR_MTIME_SET))
1749                 sattr->ia_valid |= ATTR_MTIME;
1750 }
1751
1752 /*
1753  * Returns a referenced nfs4_state
1754  */
1755 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1756 {
1757         struct nfs4_state_owner  *sp;
1758         struct nfs4_state     *state = NULL;
1759         struct nfs_server       *server = NFS_SERVER(dir);
1760         struct nfs4_opendata *opendata;
1761         int status;
1762
1763         /* Protect against reboot recovery conflicts */
1764         status = -ENOMEM;
1765         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1766         if (sp == NULL) {
1767                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1768                 goto out_err;
1769         }
1770         status = nfs4_recover_expired_lease(server);
1771         if (status != 0)
1772                 goto err_put_state_owner;
1773         if (dentry->d_inode != NULL)
1774                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1775         status = -ENOMEM;
1776         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1777         if (opendata == NULL)
1778                 goto err_put_state_owner;
1779
1780         if (dentry->d_inode != NULL)
1781                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1782
1783         status = _nfs4_proc_open(opendata);
1784         if (status != 0)
1785                 goto err_opendata_put;
1786
1787         state = nfs4_opendata_to_nfs4_state(opendata);
1788         status = PTR_ERR(state);
1789         if (IS_ERR(state))
1790                 goto err_opendata_put;
1791         if (server->caps & NFS_CAP_POSIX_LOCK)
1792                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1793
1794         if (opendata->o_arg.open_flags & O_EXCL) {
1795                 nfs4_exclusive_attrset(opendata, sattr);
1796
1797                 nfs_fattr_init(opendata->o_res.f_attr);
1798                 status = nfs4_do_setattr(state->inode, cred,
1799                                 opendata->o_res.f_attr, sattr,
1800                                 state);
1801                 if (status == 0)
1802                         nfs_setattr_update_inode(state->inode, sattr);
1803                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1804         }
1805         nfs4_opendata_put(opendata);
1806         nfs4_put_state_owner(sp);
1807         *res = state;
1808         return 0;
1809 err_opendata_put:
1810         nfs4_opendata_put(opendata);
1811 err_put_state_owner:
1812         nfs4_put_state_owner(sp);
1813 out_err:
1814         *res = NULL;
1815         return status;
1816 }
1817
1818
1819 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1820 {
1821         struct nfs4_exception exception = { };
1822         struct nfs4_state *res;
1823         int status;
1824
1825         do {
1826                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1827                 if (status == 0)
1828                         break;
1829                 /* NOTE: BAD_SEQID means the server and client disagree about the
1830                  * book-keeping w.r.t. state-changing operations
1831                  * (OPEN/CLOSE/LOCK/LOCKU...)
1832                  * It is actually a sign of a bug on the client or on the server.
1833                  *
1834                  * If we receive a BAD_SEQID error in the particular case of
1835                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1836                  * have unhashed the old state_owner for us, and that we can
1837                  * therefore safely retry using a new one. We should still warn
1838                  * the user though...
1839                  */
1840                 if (status == -NFS4ERR_BAD_SEQID) {
1841                         printk(KERN_WARNING "NFS: v4 server %s "
1842                                         " returned a bad sequence-id error!\n",
1843                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1844                         exception.retry = 1;
1845                         continue;
1846                 }
1847                 /*
1848                  * BAD_STATEID on OPEN means that the server cancelled our
1849                  * state before it received the OPEN_CONFIRM.
1850                  * Recover by retrying the request as per the discussion
1851                  * on Page 181 of RFC3530.
1852                  */
1853                 if (status == -NFS4ERR_BAD_STATEID) {
1854                         exception.retry = 1;
1855                         continue;
1856                 }
1857                 if (status == -EAGAIN) {
1858                         /* We must have found a delegation */
1859                         exception.retry = 1;
1860                         continue;
1861                 }
1862                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1863                                         status, &exception));
1864         } while (exception.retry);
1865         return res;
1866 }
1867
1868 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1869                             struct nfs_fattr *fattr, struct iattr *sattr,
1870                             struct nfs4_state *state)
1871 {
1872         struct nfs_server *server = NFS_SERVER(inode);
1873         struct nfs_setattrargs  arg = {
1874                 .fh             = NFS_FH(inode),
1875                 .iap            = sattr,
1876                 .server         = server,
1877                 .bitmask = server->attr_bitmask,
1878         };
1879         struct nfs_setattrres  res = {
1880                 .fattr          = fattr,
1881                 .server         = server,
1882         };
1883         struct rpc_message msg = {
1884                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1885                 .rpc_argp       = &arg,
1886                 .rpc_resp       = &res,
1887                 .rpc_cred       = cred,
1888         };
1889         unsigned long timestamp = jiffies;
1890         int status;
1891
1892         nfs_fattr_init(fattr);
1893
1894         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1895                 /* Use that stateid */
1896         } else if (state != NULL) {
1897                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1898         } else
1899                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1900
1901         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1902         if (status == 0 && state != NULL)
1903                 renew_lease(server, timestamp);
1904         return status;
1905 }
1906
1907 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1908                            struct nfs_fattr *fattr, struct iattr *sattr,
1909                            struct nfs4_state *state)
1910 {
1911         struct nfs_server *server = NFS_SERVER(inode);
1912         struct nfs4_exception exception = { };
1913         int err;
1914         do {
1915                 err = nfs4_handle_exception(server,
1916                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1917                                 &exception);
1918         } while (exception.retry);
1919         return err;
1920 }
1921
1922 struct nfs4_closedata {
1923         struct inode *inode;
1924         struct nfs4_state *state;
1925         struct nfs_closeargs arg;
1926         struct nfs_closeres res;
1927         struct nfs_fattr fattr;
1928         unsigned long timestamp;
1929         bool roc;
1930         u32 roc_barrier;
1931 };
1932
1933 static void nfs4_free_closedata(void *data)
1934 {
1935         struct nfs4_closedata *calldata = data;
1936         struct nfs4_state_owner *sp = calldata->state->owner;
1937         struct super_block *sb = calldata->state->inode->i_sb;
1938
1939         if (calldata->roc)
1940                 pnfs_roc_release(calldata->state->inode);
1941         nfs4_put_open_state(calldata->state);
1942         nfs_free_seqid(calldata->arg.seqid);
1943         nfs4_put_state_owner(sp);
1944         nfs_sb_deactive(sb);
1945         kfree(calldata);
1946 }
1947
1948 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1949                 fmode_t fmode)
1950 {
1951         spin_lock(&state->owner->so_lock);
1952         if (!(fmode & FMODE_READ))
1953                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1954         if (!(fmode & FMODE_WRITE))
1955                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1956         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1957         spin_unlock(&state->owner->so_lock);
1958 }
1959
1960 static void nfs4_close_done(struct rpc_task *task, void *data)
1961 {
1962         struct nfs4_closedata *calldata = data;
1963         struct nfs4_state *state = calldata->state;
1964         struct nfs_server *server = NFS_SERVER(calldata->inode);
1965
1966         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1967                 return;
1968         /* hmm. we are done with the inode, and in the process of freeing
1969          * the state_owner. we keep this around to process errors
1970          */
1971         switch (task->tk_status) {
1972                 case 0:
1973                         if (calldata->roc)
1974                                 pnfs_roc_set_barrier(state->inode,
1975                                                      calldata->roc_barrier);
1976                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1977                         renew_lease(server, calldata->timestamp);
1978                         nfs4_close_clear_stateid_flags(state,
1979                                         calldata->arg.fmode);
1980                         break;
1981                 case -NFS4ERR_STALE_STATEID:
1982                 case -NFS4ERR_OLD_STATEID:
1983                 case -NFS4ERR_BAD_STATEID:
1984                 case -NFS4ERR_EXPIRED:
1985                         if (calldata->arg.fmode == 0)
1986                                 break;
1987                 default:
1988                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1989                                 rpc_restart_call_prepare(task);
1990         }
1991         nfs_release_seqid(calldata->arg.seqid);
1992         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1993 }
1994
1995 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1996 {
1997         struct nfs4_closedata *calldata = data;
1998         struct nfs4_state *state = calldata->state;
1999         int call_close = 0;
2000
2001         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2002                 return;
2003
2004         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2005         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2006         spin_lock(&state->owner->so_lock);
2007         /* Calculate the change in open mode */
2008         if (state->n_rdwr == 0) {
2009                 if (state->n_rdonly == 0) {
2010                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2011                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2012                         calldata->arg.fmode &= ~FMODE_READ;
2013                 }
2014                 if (state->n_wronly == 0) {
2015                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2016                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2017                         calldata->arg.fmode &= ~FMODE_WRITE;
2018                 }
2019         }
2020         spin_unlock(&state->owner->so_lock);
2021
2022         if (!call_close) {
2023                 /* Note: exit _without_ calling nfs4_close_done */
2024                 task->tk_action = NULL;
2025                 return;
2026         }
2027
2028         if (calldata->arg.fmode == 0) {
2029                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2030                 if (calldata->roc &&
2031                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2032                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2033                                      task, NULL);
2034                         return;
2035                 }
2036         }
2037
2038         nfs_fattr_init(calldata->res.fattr);
2039         calldata->timestamp = jiffies;
2040         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2041                                 &calldata->arg.seq_args,
2042                                 &calldata->res.seq_res,
2043                                 task))
2044                 return;
2045         rpc_call_start(task);
2046 }
2047
2048 static const struct rpc_call_ops nfs4_close_ops = {
2049         .rpc_call_prepare = nfs4_close_prepare,
2050         .rpc_call_done = nfs4_close_done,
2051         .rpc_release = nfs4_free_closedata,
2052 };
2053
2054 /*
2055  * It is possible for data to be read/written from a mem-mapped file
2056  * after the sys_close call (which hits the vfs layer as a flush).
2057  * This means that we can't safely call nfsv4 close on a file until
2058  * the inode is cleared. This in turn means that we are not good
2059  * NFSv4 citizens - we do not indicate to the server to update the file's
2060  * share state even when we are done with one of the three share
2061  * stateid's in the inode.
2062  *
2063  * NOTE: Caller must be holding the sp->so_owner semaphore!
2064  */
2065 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2066 {
2067         struct nfs_server *server = NFS_SERVER(state->inode);
2068         struct nfs4_closedata *calldata;
2069         struct nfs4_state_owner *sp = state->owner;
2070         struct rpc_task *task;
2071         struct rpc_message msg = {
2072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2073                 .rpc_cred = state->owner->so_cred,
2074         };
2075         struct rpc_task_setup task_setup_data = {
2076                 .rpc_client = server->client,
2077                 .rpc_message = &msg,
2078                 .callback_ops = &nfs4_close_ops,
2079                 .workqueue = nfsiod_workqueue,
2080                 .flags = RPC_TASK_ASYNC,
2081         };
2082         int status = -ENOMEM;
2083
2084         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2085         if (calldata == NULL)
2086                 goto out;
2087         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2088         calldata->inode = state->inode;
2089         calldata->state = state;
2090         calldata->arg.fh = NFS_FH(state->inode);
2091         calldata->arg.stateid = &state->open_stateid;
2092         /* Serialization for the sequence id */
2093         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2094         if (calldata->arg.seqid == NULL)
2095                 goto out_free_calldata;
2096         calldata->arg.fmode = 0;
2097         calldata->arg.bitmask = server->cache_consistency_bitmask;
2098         calldata->res.fattr = &calldata->fattr;
2099         calldata->res.seqid = calldata->arg.seqid;
2100         calldata->res.server = server;
2101         calldata->roc = roc;
2102         nfs_sb_active(calldata->inode->i_sb);
2103
2104         msg.rpc_argp = &calldata->arg;
2105         msg.rpc_resp = &calldata->res;
2106         task_setup_data.callback_data = calldata;
2107         task = rpc_run_task(&task_setup_data);
2108         if (IS_ERR(task))
2109                 return PTR_ERR(task);
2110         status = 0;
2111         if (wait)
2112                 status = rpc_wait_for_completion_task(task);
2113         rpc_put_task(task);
2114         return status;
2115 out_free_calldata:
2116         kfree(calldata);
2117 out:
2118         if (roc)
2119                 pnfs_roc_release(state->inode);
2120         nfs4_put_open_state(state);
2121         nfs4_put_state_owner(sp);
2122         return status;
2123 }
2124
2125 static struct inode *
2126 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2127 {
2128         struct nfs4_state *state;
2129
2130         /* Protect against concurrent sillydeletes */
2131         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2132         if (IS_ERR(state))
2133                 return ERR_CAST(state);
2134         ctx->state = state;
2135         return igrab(state->inode);
2136 }
2137
2138 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2139 {
2140         if (ctx->state == NULL)
2141                 return;
2142         if (is_sync)
2143                 nfs4_close_sync(ctx->state, ctx->mode);
2144         else
2145                 nfs4_close_state(ctx->state, ctx->mode);
2146 }
2147
2148 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2149 {
2150         struct nfs4_server_caps_arg args = {
2151                 .fhandle = fhandle,
2152         };
2153         struct nfs4_server_caps_res res = {};
2154         struct rpc_message msg = {
2155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2156                 .rpc_argp = &args,
2157                 .rpc_resp = &res,
2158         };
2159         int status;
2160
2161         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2162         if (status == 0) {
2163                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2164                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2165                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2166                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2167                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2168                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2169                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2170                         server->caps |= NFS_CAP_ACLS;
2171                 if (res.has_links != 0)
2172                         server->caps |= NFS_CAP_HARDLINKS;
2173                 if (res.has_symlinks != 0)
2174                         server->caps |= NFS_CAP_SYMLINKS;
2175                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2176                         server->caps |= NFS_CAP_FILEID;
2177                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2178                         server->caps |= NFS_CAP_MODE;
2179                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2180                         server->caps |= NFS_CAP_NLINK;
2181                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2182                         server->caps |= NFS_CAP_OWNER;
2183                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2184                         server->caps |= NFS_CAP_OWNER_GROUP;
2185                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2186                         server->caps |= NFS_CAP_ATIME;
2187                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2188                         server->caps |= NFS_CAP_CTIME;
2189                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2190                         server->caps |= NFS_CAP_MTIME;
2191
2192                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2193                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2194                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2195                 server->acl_bitmask = res.acl_bitmask;
2196         }
2197
2198         return status;
2199 }
2200
2201 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2202 {
2203         struct nfs4_exception exception = { };
2204         int err;
2205         do {
2206                 err = nfs4_handle_exception(server,
2207                                 _nfs4_server_capabilities(server, fhandle),
2208                                 &exception);
2209         } while (exception.retry);
2210         return err;
2211 }
2212
2213 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2214                 struct nfs_fsinfo *info)
2215 {
2216         struct nfs4_lookup_root_arg args = {
2217                 .bitmask = nfs4_fattr_bitmap,
2218         };
2219         struct nfs4_lookup_res res = {
2220                 .server = server,
2221                 .fattr = info->fattr,
2222                 .fh = fhandle,
2223         };
2224         struct rpc_message msg = {
2225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2226                 .rpc_argp = &args,
2227                 .rpc_resp = &res,
2228         };
2229
2230         nfs_fattr_init(info->fattr);
2231         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2232 }
2233
2234 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2235                 struct nfs_fsinfo *info)
2236 {
2237         struct nfs4_exception exception = { };
2238         int err;
2239         do {
2240                 err = _nfs4_lookup_root(server, fhandle, info);
2241                 switch (err) {
2242                 case 0:
2243                 case -NFS4ERR_WRONGSEC:
2244                         break;
2245                 default:
2246                         err = nfs4_handle_exception(server, err, &exception);
2247                 }
2248         } while (exception.retry);
2249         return err;
2250 }
2251
2252 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2253                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2254 {
2255         struct rpc_auth *auth;
2256         int ret;
2257
2258         auth = rpcauth_create(flavor, server->client);
2259         if (!auth) {
2260                 ret = -EIO;
2261                 goto out;
2262         }
2263         ret = nfs4_lookup_root(server, fhandle, info);
2264 out:
2265         return ret;
2266 }
2267
2268 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2269                               struct nfs_fsinfo *info)
2270 {
2271         int i, len, status = 0;
2272         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2273
2274         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2275         flav_array[len] = RPC_AUTH_NULL;
2276         len += 1;
2277
2278         for (i = 0; i < len; i++) {
2279                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2280                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2281                         continue;
2282                 break;
2283         }
2284         /*
2285          * -EACCESS could mean that the user doesn't have correct permissions
2286          * to access the mount.  It could also mean that we tried to mount
2287          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2288          * existing mount programs don't handle -EACCES very well so it should
2289          * be mapped to -EPERM instead.
2290          */
2291         if (status == -EACCES)
2292                 status = -EPERM;
2293         return status;
2294 }
2295
2296 /*
2297  * get the file handle for the "/" directory on the server
2298  */
2299 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2300                               struct nfs_fsinfo *info)
2301 {
2302         int minor_version = server->nfs_client->cl_minorversion;
2303         int status = nfs4_lookup_root(server, fhandle, info);
2304         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2305                 /*
2306                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2307                  * by nfs4_map_errors() as this function exits.
2308                  */
2309                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2310         if (status == 0)
2311                 status = nfs4_server_capabilities(server, fhandle);
2312         if (status == 0)
2313                 status = nfs4_do_fsinfo(server, fhandle, info);
2314         return nfs4_map_errors(status);
2315 }
2316
2317 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2318 /*
2319  * Get locations and (maybe) other attributes of a referral.
2320  * Note that we'll actually follow the referral later when
2321  * we detect fsid mismatch in inode revalidation
2322  */
2323 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2324                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2325 {
2326         int status = -ENOMEM;
2327         struct page *page = NULL;
2328         struct nfs4_fs_locations *locations = NULL;
2329
2330         page = alloc_page(GFP_KERNEL);
2331         if (page == NULL)
2332                 goto out;
2333         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2334         if (locations == NULL)
2335                 goto out;
2336
2337         status = nfs4_proc_fs_locations(dir, name, locations, page);
2338         if (status != 0)
2339                 goto out;
2340         /* Make sure server returned a different fsid for the referral */
2341         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2342                 dprintk("%s: server did not return a different fsid for"
2343                         " a referral at %s\n", __func__, name->name);
2344                 status = -EIO;
2345                 goto out;
2346         }
2347         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2348         nfs_fixup_referral_attributes(&locations->fattr);
2349
2350         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2351         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2352         memset(fhandle, 0, sizeof(struct nfs_fh));
2353 out:
2354         if (page)
2355                 __free_page(page);
2356         kfree(locations);
2357         return status;
2358 }
2359
2360 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2361 {
2362         struct nfs4_getattr_arg args = {
2363                 .fh = fhandle,
2364                 .bitmask = server->attr_bitmask,
2365         };
2366         struct nfs4_getattr_res res = {
2367                 .fattr = fattr,
2368                 .server = server,
2369         };
2370         struct rpc_message msg = {
2371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2372                 .rpc_argp = &args,
2373                 .rpc_resp = &res,
2374         };
2375
2376         nfs_fattr_init(fattr);
2377         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2378 }
2379
2380 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2381 {
2382         struct nfs4_exception exception = { };
2383         int err;
2384         do {
2385                 err = nfs4_handle_exception(server,
2386                                 _nfs4_proc_getattr(server, fhandle, fattr),
2387                                 &exception);
2388         } while (exception.retry);
2389         return err;
2390 }
2391
2392 /*
2393  * The file is not closed if it is opened due to the a request to change
2394  * the size of the file. The open call will not be needed once the
2395  * VFS layer lookup-intents are implemented.
2396  *
2397  * Close is called when the inode is destroyed.
2398  * If we haven't opened the file for O_WRONLY, we
2399  * need to in the size_change case to obtain a stateid.
2400  *
2401  * Got race?
2402  * Because OPEN is always done by name in nfsv4, it is
2403  * possible that we opened a different file by the same
2404  * name.  We can recognize this race condition, but we
2405  * can't do anything about it besides returning an error.
2406  *
2407  * This will be fixed with VFS changes (lookup-intent).
2408  */
2409 static int
2410 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2411                   struct iattr *sattr)
2412 {
2413         struct inode *inode = dentry->d_inode;
2414         struct rpc_cred *cred = NULL;
2415         struct nfs4_state *state = NULL;
2416         int status;
2417
2418         if (pnfs_ld_layoutret_on_setattr(inode))
2419                 pnfs_return_layout(inode);
2420
2421         nfs_fattr_init(fattr);
2422
2423         /* Search for an existing open(O_WRITE) file */
2424         if (sattr->ia_valid & ATTR_FILE) {
2425                 struct nfs_open_context *ctx;
2426
2427                 ctx = nfs_file_open_context(sattr->ia_file);
2428                 if (ctx) {
2429                         cred = ctx->cred;
2430                         state = ctx->state;
2431                 }
2432         }
2433
2434         /* Deal with open(O_TRUNC) */
2435         if (sattr->ia_valid & ATTR_OPEN)
2436                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2437
2438         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2439         if (status == 0)
2440                 nfs_setattr_update_inode(inode, sattr);
2441         return status;
2442 }
2443
2444 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2445                 const struct qstr *name, struct nfs_fh *fhandle,
2446                 struct nfs_fattr *fattr)
2447 {
2448         struct nfs_server *server = NFS_SERVER(dir);
2449         int                    status;
2450         struct nfs4_lookup_arg args = {
2451                 .bitmask = server->attr_bitmask,
2452                 .dir_fh = NFS_FH(dir),
2453                 .name = name,
2454         };
2455         struct nfs4_lookup_res res = {
2456                 .server = server,
2457                 .fattr = fattr,
2458                 .fh = fhandle,
2459         };
2460         struct rpc_message msg = {
2461                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2462                 .rpc_argp = &args,
2463                 .rpc_resp = &res,
2464         };
2465
2466         nfs_fattr_init(fattr);
2467
2468         dprintk("NFS call  lookup %s\n", name->name);
2469         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2470         dprintk("NFS reply lookup: %d\n", status);
2471         return status;
2472 }
2473
2474 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2475 {
2476         memset(fh, 0, sizeof(struct nfs_fh));
2477         fattr->fsid.major = 1;
2478         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2479                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2480         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2481         fattr->nlink = 2;
2482 }
2483
2484 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2485                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2486 {
2487         struct nfs4_exception exception = { };
2488         int err;
2489         do {
2490                 int status;
2491
2492                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2493                 switch (status) {
2494                 case -NFS4ERR_BADNAME:
2495                         return -ENOENT;
2496                 case -NFS4ERR_MOVED:
2497                         return nfs4_get_referral(dir, name, fattr, fhandle);
2498                 case -NFS4ERR_WRONGSEC:
2499                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2500                 }
2501                 err = nfs4_handle_exception(NFS_SERVER(dir),
2502                                 status, &exception);
2503         } while (exception.retry);
2504         return err;
2505 }
2506
2507 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2508 {
2509         struct nfs_server *server = NFS_SERVER(inode);
2510         struct nfs4_accessargs args = {
2511                 .fh = NFS_FH(inode),
2512                 .bitmask = server->attr_bitmask,
2513         };
2514         struct nfs4_accessres res = {
2515                 .server = server,
2516         };
2517         struct rpc_message msg = {
2518                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2519                 .rpc_argp = &args,
2520                 .rpc_resp = &res,
2521                 .rpc_cred = entry->cred,
2522         };
2523         int mode = entry->mask;
2524         int status;
2525
2526         /*
2527          * Determine which access bits we want to ask for...
2528          */
2529         if (mode & MAY_READ)
2530                 args.access |= NFS4_ACCESS_READ;
2531         if (S_ISDIR(inode->i_mode)) {
2532                 if (mode & MAY_WRITE)
2533                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2534                 if (mode & MAY_EXEC)
2535                         args.access |= NFS4_ACCESS_LOOKUP;
2536         } else {
2537                 if (mode & MAY_WRITE)
2538                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2539                 if (mode & MAY_EXEC)
2540                         args.access |= NFS4_ACCESS_EXECUTE;
2541         }
2542
2543         res.fattr = nfs_alloc_fattr();
2544         if (res.fattr == NULL)
2545                 return -ENOMEM;
2546
2547         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2548         if (!status) {
2549                 entry->mask = 0;
2550                 if (res.access & NFS4_ACCESS_READ)
2551                         entry->mask |= MAY_READ;
2552                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2553                         entry->mask |= MAY_WRITE;
2554                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2555                         entry->mask |= MAY_EXEC;
2556                 nfs_refresh_inode(inode, res.fattr);
2557         }
2558         nfs_free_fattr(res.fattr);
2559         return status;
2560 }
2561
2562 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2563 {
2564         struct nfs4_exception exception = { };
2565         int err;
2566         do {
2567                 err = nfs4_handle_exception(NFS_SERVER(inode),
2568                                 _nfs4_proc_access(inode, entry),
2569                                 &exception);
2570         } while (exception.retry);
2571         return err;
2572 }
2573
2574 /*
2575  * TODO: For the time being, we don't try to get any attributes
2576  * along with any of the zero-copy operations READ, READDIR,
2577  * READLINK, WRITE.
2578  *
2579  * In the case of the first three, we want to put the GETATTR
2580  * after the read-type operation -- this is because it is hard
2581  * to predict the length of a GETATTR response in v4, and thus
2582  * align the READ data correctly.  This means that the GETATTR
2583  * may end up partially falling into the page cache, and we should
2584  * shift it into the 'tail' of the xdr_buf before processing.
2585  * To do this efficiently, we need to know the total length
2586  * of data received, which doesn't seem to be available outside
2587  * of the RPC layer.
2588  *
2589  * In the case of WRITE, we also want to put the GETATTR after
2590  * the operation -- in this case because we want to make sure
2591  * we get the post-operation mtime and size.  This means that
2592  * we can't use xdr_encode_pages() as written: we need a variant
2593  * of it which would leave room in the 'tail' iovec.
2594  *
2595  * Both of these changes to the XDR layer would in fact be quite
2596  * minor, but I decided to leave them for a subsequent patch.
2597  */
2598 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2599                 unsigned int pgbase, unsigned int pglen)
2600 {
2601         struct nfs4_readlink args = {
2602                 .fh       = NFS_FH(inode),
2603                 .pgbase   = pgbase,
2604                 .pglen    = pglen,
2605                 .pages    = &page,
2606         };
2607         struct nfs4_readlink_res res;
2608         struct rpc_message msg = {
2609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2610                 .rpc_argp = &args,
2611                 .rpc_resp = &res,
2612         };
2613
2614         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2615 }
2616
2617 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2618                 unsigned int pgbase, unsigned int pglen)
2619 {
2620         struct nfs4_exception exception = { };
2621         int err;
2622         do {
2623                 err = nfs4_handle_exception(NFS_SERVER(inode),
2624                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2625                                 &exception);
2626         } while (exception.retry);
2627         return err;
2628 }
2629
2630 /*
2631  * Got race?
2632  * We will need to arrange for the VFS layer to provide an atomic open.
2633  * Until then, this create/open method is prone to inefficiency and race
2634  * conditions due to the lookup, create, and open VFS calls from sys_open()
2635  * placed on the wire.
2636  *
2637  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2638  * The file will be opened again in the subsequent VFS open call
2639  * (nfs4_proc_file_open).
2640  *
2641  * The open for read will just hang around to be used by any process that
2642  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2643  */
2644
2645 static int
2646 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2647                  int flags, struct nfs_open_context *ctx)
2648 {
2649         struct dentry *de = dentry;
2650         struct nfs4_state *state;
2651         struct rpc_cred *cred = NULL;
2652         fmode_t fmode = 0;
2653         int status = 0;
2654
2655         if (ctx != NULL) {
2656                 cred = ctx->cred;
2657                 de = ctx->dentry;
2658                 fmode = ctx->mode;
2659         }
2660         sattr->ia_mode &= ~current_umask();
2661         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2662         d_drop(dentry);
2663         if (IS_ERR(state)) {
2664                 status = PTR_ERR(state);
2665                 goto out;
2666         }
2667         d_add(dentry, igrab(state->inode));
2668         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2669         if (ctx != NULL)
2670                 ctx->state = state;
2671         else
2672                 nfs4_close_sync(state, fmode);
2673 out:
2674         return status;
2675 }
2676
2677 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2678 {
2679         struct nfs_server *server = NFS_SERVER(dir);
2680         struct nfs_removeargs args = {
2681                 .fh = NFS_FH(dir),
2682                 .name.len = name->len,
2683                 .name.name = name->name,
2684                 .bitmask = server->attr_bitmask,
2685         };
2686         struct nfs_removeres res = {
2687                 .server = server,
2688         };
2689         struct rpc_message msg = {
2690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2691                 .rpc_argp = &args,
2692                 .rpc_resp = &res,
2693         };
2694         int status = -ENOMEM;
2695
2696         res.dir_attr = nfs_alloc_fattr();
2697         if (res.dir_attr == NULL)
2698                 goto out;
2699
2700         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2701         if (status == 0) {
2702                 update_changeattr(dir, &res.cinfo);
2703                 nfs_post_op_update_inode(dir, res.dir_attr);
2704         }
2705         nfs_free_fattr(res.dir_attr);
2706 out:
2707         return status;
2708 }
2709
2710 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2711 {
2712         struct nfs4_exception exception = { };
2713         int err;
2714         do {
2715                 err = nfs4_handle_exception(NFS_SERVER(dir),
2716                                 _nfs4_proc_remove(dir, name),
2717                                 &exception);
2718         } while (exception.retry);
2719         return err;
2720 }
2721
2722 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2723 {
2724         struct nfs_server *server = NFS_SERVER(dir);
2725         struct nfs_removeargs *args = msg->rpc_argp;
2726         struct nfs_removeres *res = msg->rpc_resp;
2727
2728         args->bitmask = server->cache_consistency_bitmask;
2729         res->server = server;
2730         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2731         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2732 }
2733
2734 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2735 {
2736         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2737
2738         if (!nfs4_sequence_done(task, &res->seq_res))
2739                 return 0;
2740         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2741                 return 0;
2742         update_changeattr(dir, &res->cinfo);
2743         nfs_post_op_update_inode(dir, res->dir_attr);
2744         return 1;
2745 }
2746
2747 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2748 {
2749         struct nfs_server *server = NFS_SERVER(dir);
2750         struct nfs_renameargs *arg = msg->rpc_argp;
2751         struct nfs_renameres *res = msg->rpc_resp;
2752
2753         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2754         arg->bitmask = server->attr_bitmask;
2755         res->server = server;
2756         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2757 }
2758
2759 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2760                                  struct inode *new_dir)
2761 {
2762         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2763
2764         if (!nfs4_sequence_done(task, &res->seq_res))
2765                 return 0;
2766         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2767                 return 0;
2768
2769         update_changeattr(old_dir, &res->old_cinfo);
2770         nfs_post_op_update_inode(old_dir, res->old_fattr);
2771         update_changeattr(new_dir, &res->new_cinfo);
2772         nfs_post_op_update_inode(new_dir, res->new_fattr);
2773         return 1;
2774 }
2775
2776 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2777                 struct inode *new_dir, struct qstr *new_name)
2778 {
2779         struct nfs_server *server = NFS_SERVER(old_dir);
2780         struct nfs_renameargs arg = {
2781                 .old_dir = NFS_FH(old_dir),
2782                 .new_dir = NFS_FH(new_dir),
2783                 .old_name = old_name,
2784                 .new_name = new_name,
2785                 .bitmask = server->attr_bitmask,
2786         };
2787         struct nfs_renameres res = {
2788                 .server = server,
2789         };
2790         struct rpc_message msg = {
2791                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2792                 .rpc_argp = &arg,
2793                 .rpc_resp = &res,
2794         };
2795         int status = -ENOMEM;
2796
2797         res.old_fattr = nfs_alloc_fattr();
2798         res.new_fattr = nfs_alloc_fattr();
2799         if (res.old_fattr == NULL || res.new_fattr == NULL)
2800                 goto out;
2801
2802         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2803         if (!status) {
2804                 update_changeattr(old_dir, &res.old_cinfo);
2805                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2806                 update_changeattr(new_dir, &res.new_cinfo);
2807                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2808         }
2809 out:
2810         nfs_free_fattr(res.new_fattr);
2811         nfs_free_fattr(res.old_fattr);
2812         return status;
2813 }
2814
2815 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2816                 struct inode *new_dir, struct qstr *new_name)
2817 {
2818         struct nfs4_exception exception = { };
2819         int err;
2820         do {
2821                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2822                                 _nfs4_proc_rename(old_dir, old_name,
2823                                         new_dir, new_name),
2824                                 &exception);
2825         } while (exception.retry);
2826         return err;
2827 }
2828
2829 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2830 {
2831         struct nfs_server *server = NFS_SERVER(inode);
2832         struct nfs4_link_arg arg = {
2833                 .fh     = NFS_FH(inode),
2834                 .dir_fh = NFS_FH(dir),
2835                 .name   = name,
2836                 .bitmask = server->attr_bitmask,
2837         };
2838         struct nfs4_link_res res = {
2839                 .server = server,
2840         };
2841         struct rpc_message msg = {
2842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2843                 .rpc_argp = &arg,
2844                 .rpc_resp = &res,
2845         };
2846         int status = -ENOMEM;
2847
2848         res.fattr = nfs_alloc_fattr();
2849         res.dir_attr = nfs_alloc_fattr();
2850         if (res.fattr == NULL || res.dir_attr == NULL)
2851                 goto out;
2852
2853         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2854         if (!status) {
2855                 update_changeattr(dir, &res.cinfo);
2856                 nfs_post_op_update_inode(dir, res.dir_attr);
2857                 nfs_post_op_update_inode(inode, res.fattr);
2858         }
2859 out:
2860         nfs_free_fattr(res.dir_attr);
2861         nfs_free_fattr(res.fattr);
2862         return status;
2863 }
2864
2865 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2866 {
2867         struct nfs4_exception exception = { };
2868         int err;
2869         do {
2870                 err = nfs4_handle_exception(NFS_SERVER(inode),
2871                                 _nfs4_proc_link(inode, dir, name),
2872                                 &exception);
2873         } while (exception.retry);
2874         return err;
2875 }
2876
2877 struct nfs4_createdata {
2878         struct rpc_message msg;
2879         struct nfs4_create_arg arg;
2880         struct nfs4_create_res res;
2881         struct nfs_fh fh;
2882         struct nfs_fattr fattr;
2883         struct nfs_fattr dir_fattr;
2884 };
2885
2886 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2887                 struct qstr *name, struct iattr *sattr, u32 ftype)
2888 {
2889         struct nfs4_createdata *data;
2890
2891         data = kzalloc(sizeof(*data), GFP_KERNEL);
2892         if (data != NULL) {
2893                 struct nfs_server *server = NFS_SERVER(dir);
2894
2895                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2896                 data->msg.rpc_argp = &data->arg;
2897                 data->msg.rpc_resp = &data->res;
2898                 data->arg.dir_fh = NFS_FH(dir);
2899                 data->arg.server = server;
2900                 data->arg.name = name;
2901                 data->arg.attrs = sattr;
2902                 data->arg.ftype = ftype;
2903                 data->arg.bitmask = server->attr_bitmask;
2904                 data->res.server = server;
2905                 data->res.fh = &data->fh;
2906                 data->res.fattr = &data->fattr;
2907                 data->res.dir_fattr = &data->dir_fattr;
2908                 nfs_fattr_init(data->res.fattr);
2909                 nfs_fattr_init(data->res.dir_fattr);
2910         }
2911         return data;
2912 }
2913
2914 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2915 {
2916         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2917                                     &data->arg.seq_args, &data->res.seq_res, 1);
2918         if (status == 0) {
2919                 update_changeattr(dir, &data->res.dir_cinfo);
2920                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2921                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2922         }
2923         return status;
2924 }
2925
2926 static void nfs4_free_createdata(struct nfs4_createdata *data)
2927 {
2928         kfree(data);
2929 }
2930
2931 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2932                 struct page *page, unsigned int len, struct iattr *sattr)
2933 {
2934         struct nfs4_createdata *data;
2935         int status = -ENAMETOOLONG;
2936
2937         if (len > NFS4_MAXPATHLEN)
2938                 goto out;
2939
2940         status = -ENOMEM;
2941         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2942         if (data == NULL)
2943                 goto out;
2944
2945         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2946         data->arg.u.symlink.pages = &page;
2947         data->arg.u.symlink.len = len;
2948
2949         status = nfs4_do_create(dir, dentry, data);
2950
2951         nfs4_free_createdata(data);
2952 out:
2953         return status;
2954 }
2955
2956 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2957                 struct page *page, unsigned int len, struct iattr *sattr)
2958 {
2959         struct nfs4_exception exception = { };
2960         int err;
2961         do {
2962                 err = nfs4_handle_exception(NFS_SERVER(dir),
2963                                 _nfs4_proc_symlink(dir, dentry, page,
2964                                                         len, sattr),
2965                                 &exception);
2966         } while (exception.retry);
2967         return err;
2968 }
2969
2970 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2971                 struct iattr *sattr)
2972 {
2973         struct nfs4_createdata *data;
2974         int status = -ENOMEM;
2975
2976         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2977         if (data == NULL)
2978                 goto out;
2979
2980         status = nfs4_do_create(dir, dentry, data);
2981
2982         nfs4_free_createdata(data);
2983 out:
2984         return status;
2985 }
2986
2987 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2988                 struct iattr *sattr)
2989 {
2990         struct nfs4_exception exception = { };
2991         int err;
2992
2993         sattr->ia_mode &= ~current_umask();
2994         do {
2995                 err = nfs4_handle_exception(NFS_SERVER(dir),
2996                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2997                                 &exception);
2998         } while (exception.retry);
2999         return err;
3000 }
3001
3002 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3003                 u64 cookie, struct page **pages, unsigned int count, int plus)
3004 {
3005         struct inode            *dir = dentry->d_inode;
3006         struct nfs4_readdir_arg args = {
3007                 .fh = NFS_FH(dir),
3008                 .pages = pages,
3009                 .pgbase = 0,
3010                 .count = count,
3011                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3012                 .plus = plus,
3013         };
3014         struct nfs4_readdir_res res;
3015         struct rpc_message msg = {
3016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3017                 .rpc_argp = &args,
3018                 .rpc_resp = &res,
3019                 .rpc_cred = cred,
3020         };
3021         int                     status;
3022
3023         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3024                         dentry->d_parent->d_name.name,
3025                         dentry->d_name.name,
3026                         (unsigned long long)cookie);
3027         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3028         res.pgbase = args.pgbase;
3029         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3030         if (status >= 0) {
3031                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3032                 status += args.pgbase;
3033         }
3034
3035         nfs_invalidate_atime(dir);
3036
3037         dprintk("%s: returns %d\n", __func__, status);
3038         return status;
3039 }
3040
3041 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3042                 u64 cookie, struct page **pages, unsigned int count, int plus)
3043 {
3044         struct nfs4_exception exception = { };
3045         int err;
3046         do {
3047                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3048                                 _nfs4_proc_readdir(dentry, cred, cookie,
3049                                         pages, count, plus),
3050                                 &exception);
3051         } while (exception.retry);
3052         return err;
3053 }
3054
3055 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3056                 struct iattr *sattr, dev_t rdev)
3057 {
3058         struct nfs4_createdata *data;
3059         int mode = sattr->ia_mode;
3060         int status = -ENOMEM;
3061
3062         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3063         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3064
3065         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3066         if (data == NULL)
3067                 goto out;
3068
3069         if (S_ISFIFO(mode))
3070                 data->arg.ftype = NF4FIFO;
3071         else if (S_ISBLK(mode)) {
3072                 data->arg.ftype = NF4BLK;
3073                 data->arg.u.device.specdata1 = MAJOR(rdev);
3074                 data->arg.u.device.specdata2 = MINOR(rdev);
3075         }
3076         else if (S_ISCHR(mode)) {
3077                 data->arg.ftype = NF4CHR;
3078                 data->arg.u.device.specdata1 = MAJOR(rdev);
3079                 data->arg.u.device.specdata2 = MINOR(rdev);
3080         }
3081
3082         status = nfs4_do_create(dir, dentry, data);
3083
3084         nfs4_free_createdata(data);
3085 out:
3086         return status;
3087 }
3088
3089 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3090                 struct iattr *sattr, dev_t rdev)
3091 {
3092         struct nfs4_exception exception = { };
3093         int err;
3094
3095         sattr->ia_mode &= ~current_umask();
3096         do {
3097                 err = nfs4_handle_exception(NFS_SERVER(dir),
3098                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3099                                 &exception);
3100         } while (exception.retry);
3101         return err;
3102 }
3103
3104 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3105                  struct nfs_fsstat *fsstat)
3106 {
3107         struct nfs4_statfs_arg args = {
3108                 .fh = fhandle,
3109                 .bitmask = server->attr_bitmask,
3110         };
3111         struct nfs4_statfs_res res = {
3112                 .fsstat = fsstat,
3113         };
3114         struct rpc_message msg = {
3115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3116                 .rpc_argp = &args,
3117                 .rpc_resp = &res,
3118         };
3119
3120         nfs_fattr_init(fsstat->fattr);
3121         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3122 }
3123
3124 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3125 {
3126         struct nfs4_exception exception = { };
3127         int err;
3128         do {
3129                 err = nfs4_handle_exception(server,
3130                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3131                                 &exception);
3132         } while (exception.retry);
3133         return err;
3134 }
3135
3136 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3137                 struct nfs_fsinfo *fsinfo)
3138 {
3139         struct nfs4_fsinfo_arg args = {
3140                 .fh = fhandle,
3141                 .bitmask = server->attr_bitmask,
3142         };
3143         struct nfs4_fsinfo_res res = {
3144                 .fsinfo = fsinfo,
3145         };
3146         struct rpc_message msg = {
3147                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3148                 .rpc_argp = &args,
3149                 .rpc_resp = &res,
3150         };
3151
3152         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3153 }
3154
3155 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3156 {
3157         struct nfs4_exception exception = { };
3158         int err;
3159
3160         do {
3161                 err = nfs4_handle_exception(server,
3162                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3163                                 &exception);
3164         } while (exception.retry);
3165         return err;
3166 }
3167
3168 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3169 {
3170         nfs_fattr_init(fsinfo->fattr);
3171         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3172 }
3173
3174 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3175                 struct nfs_pathconf *pathconf)
3176 {
3177         struct nfs4_pathconf_arg args = {
3178                 .fh = fhandle,
3179                 .bitmask = server->attr_bitmask,
3180         };
3181         struct nfs4_pathconf_res res = {
3182                 .pathconf = pathconf,
3183         };
3184         struct rpc_message msg = {
3185                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3186                 .rpc_argp = &args,
3187                 .rpc_resp = &res,
3188         };
3189
3190         /* None of the pathconf attributes are mandatory to implement */
3191         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3192                 memset(pathconf, 0, sizeof(*pathconf));
3193                 return 0;
3194         }
3195
3196         nfs_fattr_init(pathconf->fattr);
3197         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3198 }
3199
3200 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3201                 struct nfs_pathconf *pathconf)
3202 {
3203         struct nfs4_exception exception = { };
3204         int err;
3205
3206         do {
3207                 err = nfs4_handle_exception(server,
3208                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3209                                 &exception);
3210         } while (exception.retry);
3211         return err;
3212 }
3213
3214 void __nfs4_read_done_cb(struct nfs_read_data *data)
3215 {
3216         nfs_invalidate_atime(data->inode);
3217 }
3218
3219 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3220 {
3221         struct nfs_server *server = NFS_SERVER(data->inode);
3222
3223         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3224                 rpc_restart_call_prepare(task);
3225                 return -EAGAIN;
3226         }
3227
3228         __nfs4_read_done_cb(data);
3229         if (task->tk_status > 0)
3230                 renew_lease(server, data->timestamp);
3231         return 0;
3232 }
3233
3234 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3235 {
3236
3237         dprintk("--> %s\n", __func__);
3238
3239         if (!nfs4_sequence_done(task, &data->res.seq_res))
3240                 return -EAGAIN;
3241
3242         return data->read_done_cb ? data->read_done_cb(task, data) :
3243                                     nfs4_read_done_cb(task, data);
3244 }
3245
3246 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3247 {
3248         data->timestamp   = jiffies;
3249         data->read_done_cb = nfs4_read_done_cb;
3250         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3251         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3252 }
3253
3254 /* Reset the the nfs_read_data to send the read to the MDS. */
3255 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3256 {
3257         dprintk("%s Reset task for i/o through\n", __func__);
3258         put_lseg(data->lseg);
3259         data->lseg = NULL;
3260         /* offsets will differ in the dense stripe case */
3261         data->args.offset = data->mds_offset;
3262         data->ds_clp = NULL;
3263         data->args.fh     = NFS_FH(data->inode);
3264         data->read_done_cb = nfs4_read_done_cb;
3265         task->tk_ops = data->mds_ops;
3266         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3267 }
3268 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3269
3270 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3271 {
3272         struct inode *inode = data->inode;
3273
3274         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3275                 rpc_restart_call_prepare(task);
3276                 return -EAGAIN;
3277         }
3278         if (task->tk_status >= 0) {
3279                 renew_lease(NFS_SERVER(inode), data->timestamp);
3280                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3281         }
3282         return 0;
3283 }
3284
3285 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3286 {
3287         if (!nfs4_sequence_done(task, &data->res.seq_res))
3288                 return -EAGAIN;
3289         return data->write_done_cb ? data->write_done_cb(task, data) :
3290                 nfs4_write_done_cb(task, data);
3291 }
3292
3293 /* Reset the the nfs_write_data to send the write to the MDS. */
3294 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3295 {
3296         dprintk("%s Reset task for i/o through\n", __func__);
3297         put_lseg(data->lseg);
3298         data->lseg          = NULL;
3299         data->ds_clp        = NULL;
3300         data->write_done_cb = nfs4_write_done_cb;
3301         data->args.fh       = NFS_FH(data->inode);
3302         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3303         data->args.offset   = data->mds_offset;
3304         data->res.fattr     = &data->fattr;
3305         task->tk_ops        = data->mds_ops;
3306         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3307 }
3308 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3309
3310 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3311 {
3312         struct nfs_server *server = NFS_SERVER(data->inode);
3313
3314         if (data->lseg) {
3315                 data->args.bitmask = NULL;
3316                 data->res.fattr = NULL;
3317         } else
3318                 data->args.bitmask = server->cache_consistency_bitmask;
3319         if (!data->write_done_cb)
3320                 data->write_done_cb = nfs4_write_done_cb;
3321         data->res.server = server;
3322         data->timestamp   = jiffies;
3323
3324         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3325         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3326 }
3327
3328 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3329 {
3330         struct inode *inode = data->inode;
3331
3332         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3333                 rpc_restart_call_prepare(task);
3334                 return -EAGAIN;
3335         }
3336         nfs_refresh_inode(inode, data->res.fattr);
3337         return 0;
3338 }
3339
3340 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3341 {
3342         if (!nfs4_sequence_done(task, &data->res.seq_res))
3343                 return -EAGAIN;
3344         return data->write_done_cb(task, data);
3345 }
3346
3347 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3348 {
3349         struct nfs_server *server = NFS_SERVER(data->inode);
3350
3351         if (data->lseg) {
3352                 data->args.bitmask = NULL;
3353                 data->res.fattr = NULL;
3354         } else
3355                 data->args.bitmask = server->cache_consistency_bitmask;
3356         if (!data->write_done_cb)
3357                 data->write_done_cb = nfs4_commit_done_cb;
3358         data->res.server = server;
3359         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3360         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3361 }
3362
3363 struct nfs4_renewdata {
3364         struct nfs_client       *client;
3365         unsigned long           timestamp;
3366 };
3367
3368 /*
3369  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3370  * standalone procedure for queueing an asynchronous RENEW.
3371  */
3372 static void nfs4_renew_release(void *calldata)
3373 {
3374         struct nfs4_renewdata *data = calldata;
3375         struct nfs_client *clp = data->client;
3376
3377         if (atomic_read(&clp->cl_count) > 1)
3378                 nfs4_schedule_state_renewal(clp);
3379         nfs_put_client(clp);
3380         kfree(data);
3381 }
3382
3383 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3384 {
3385         struct nfs4_renewdata *data = calldata;
3386         struct nfs_client *clp = data->client;
3387         unsigned long timestamp = data->timestamp;
3388
3389         if (task->tk_status < 0) {
3390                 /* Unless we're shutting down, schedule state recovery! */
3391                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3392                         return;
3393                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3394                         nfs4_schedule_lease_recovery(clp);
3395                         return;
3396                 }
3397                 nfs4_schedule_path_down_recovery(clp);
3398         }
3399         do_renew_lease(clp, timestamp);
3400 }
3401
3402 static const struct rpc_call_ops nfs4_renew_ops = {
3403         .rpc_call_done = nfs4_renew_done,
3404         .rpc_release = nfs4_renew_release,
3405 };
3406
3407 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3408 {
3409         struct rpc_message msg = {
3410                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3411                 .rpc_argp       = clp,
3412                 .rpc_cred       = cred,
3413         };
3414         struct nfs4_renewdata *data;
3415
3416         if (renew_flags == 0)
3417                 return 0;
3418         if (!atomic_inc_not_zero(&clp->cl_count))
3419                 return -EIO;
3420         data = kmalloc(sizeof(*data), GFP_NOFS);
3421         if (data == NULL)
3422                 return -ENOMEM;
3423         data->client = clp;
3424         data->timestamp = jiffies;
3425         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3426                         &nfs4_renew_ops, data);
3427 }
3428
3429 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3430 {
3431         struct rpc_message msg = {
3432                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3433                 .rpc_argp       = clp,
3434                 .rpc_cred       = cred,
3435         };
3436         unsigned long now = jiffies;
3437         int status;
3438
3439         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3440         if (status < 0)
3441                 return status;
3442         do_renew_lease(clp, now);
3443         return 0;
3444 }
3445
3446 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3447 {
3448         return (server->caps & NFS_CAP_ACLS)
3449                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3450                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3451 }
3452
3453 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3454  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3455  * the stack.
3456  */
3457 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3458
3459 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3460                 struct page **pages, unsigned int *pgbase)
3461 {
3462         struct page *newpage, **spages;
3463         int rc = 0;
3464         size_t len;
3465         spages = pages;
3466
3467         do {
3468                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3469                 newpage = alloc_page(GFP_KERNEL);
3470
3471                 if (newpage == NULL)
3472                         goto unwind;
3473                 memcpy(page_address(newpage), buf, len);
3474                 buf += len;
3475                 buflen -= len;
3476                 *pages++ = newpage;
3477                 rc++;
3478         } while (buflen != 0);
3479
3480         return rc;
3481
3482 unwind:
3483         for(; rc > 0; rc--)
3484                 __free_page(spages[rc-1]);
3485         return -ENOMEM;
3486 }
3487
3488 struct nfs4_cached_acl {
3489         int cached;
3490         size_t len;
3491         char data[0];
3492 };
3493
3494 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3495 {
3496         struct nfs_inode *nfsi = NFS_I(inode);
3497
3498         spin_lock(&inode->i_lock);
3499         kfree(nfsi->nfs4_acl);
3500         nfsi->nfs4_acl = acl;
3501         spin_unlock(&inode->i_lock);
3502 }
3503
3504 static void nfs4_zap_acl_attr(struct inode *inode)
3505 {
3506         nfs4_set_cached_acl(inode, NULL);
3507 }
3508
3509 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3510 {
3511         struct nfs_inode *nfsi = NFS_I(inode);
3512         struct nfs4_cached_acl *acl;
3513         int ret = -ENOENT;
3514
3515         spin_lock(&inode->i_lock);
3516         acl = nfsi->nfs4_acl;
3517         if (acl == NULL)
3518                 goto out;
3519         if (buf == NULL) /* user is just asking for length */
3520                 goto out_len;
3521         if (acl->cached == 0)
3522                 goto out;
3523         ret = -ERANGE; /* see getxattr(2) man page */
3524         if (acl->len > buflen)
3525                 goto out;
3526         memcpy(buf, acl->data, acl->len);
3527 out_len:
3528         ret = acl->len;
3529 out:
3530         spin_unlock(&inode->i_lock);
3531         return ret;
3532 }
3533
3534 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3535 {
3536         struct nfs4_cached_acl *acl;
3537
3538         if (buf && acl_len <= PAGE_SIZE) {
3539                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3540                 if (acl == NULL)
3541                         goto out;
3542                 acl->cached = 1;
3543                 memcpy(acl->data, buf, acl_len);
3544         } else {
3545                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3546                 if (acl == NULL)
3547                         goto out;
3548                 acl->cached = 0;
3549         }
3550         acl->len = acl_len;
3551 out:
3552         nfs4_set_cached_acl(inode, acl);
3553 }
3554
3555 /*
3556  * The getxattr API returns the required buffer length when called with a
3557  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3558  * the required buf.  On a NULL buf, we send a page of data to the server
3559  * guessing that the ACL request can be serviced by a page. If so, we cache
3560  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3561  * the cache. If not so, we throw away the page, and cache the required
3562  * length. The next getxattr call will then produce another round trip to
3563  * the server, this time with the input buf of the required size.
3564  */
3565 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3566 {
3567         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3568         struct nfs_getaclargs args = {
3569                 .fh = NFS_FH(inode),
3570                 .acl_pages = pages,
3571                 .acl_len = buflen,
3572         };
3573         struct nfs_getaclres res = {
3574                 .acl_len = buflen,
3575         };
3576         void *resp_buf;
3577         struct rpc_message msg = {
3578                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3579                 .rpc_argp = &args,
3580                 .rpc_resp = &res,
3581         };
3582         int ret = -ENOMEM, npages, i, acl_len = 0;
3583
3584         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3585         /* As long as we're doing a round trip to the server anyway,
3586          * let's be prepared for a page of acl data. */
3587         if (npages == 0)
3588                 npages = 1;
3589
3590         for (i = 0; i < npages; i++) {
3591                 pages[i] = alloc_page(GFP_KERNEL);
3592                 if (!pages[i])
3593                         goto out_free;
3594         }
3595         if (npages > 1) {
3596                 /* for decoding across pages */
3597                 args.acl_scratch = alloc_page(GFP_KERNEL);
3598                 if (!args.acl_scratch)
3599                         goto out_free;
3600         }
3601         args.acl_len = npages * PAGE_SIZE;
3602         args.acl_pgbase = 0;
3603         /* Let decode_getfacl know not to fail if the ACL data is larger than
3604          * the page we send as a guess */
3605         if (buf == NULL)
3606                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3607         resp_buf = page_address(pages[0]);
3608
3609         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3610                 __func__, buf, buflen, npages, args.acl_len);
3611         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3612                              &msg, &args.seq_args, &res.seq_res, 0);
3613         if (ret)
3614                 goto out_free;
3615
3616         acl_len = res.acl_len - res.acl_data_offset;
3617         if (acl_len > args.acl_len)
3618                 nfs4_write_cached_acl(inode, NULL, acl_len);
3619         else
3620                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3621                                       acl_len);
3622         if (buf) {
3623                 ret = -ERANGE;
3624                 if (acl_len > buflen)
3625                         goto out_free;
3626                 _copy_from_pages(buf, pages, res.acl_data_offset,
3627                                 res.acl_len);
3628         }
3629         ret = acl_len;
3630 out_free:
3631         for (i = 0; i < npages; i++)
3632                 if (pages[i])
3633                         __free_page(pages[i]);
3634         if (args.acl_scratch)
3635                 __free_page(args.acl_scratch);
3636         return ret;
3637 }
3638
3639 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3640 {
3641         struct nfs4_exception exception = { };
3642         ssize_t ret;
3643         do {
3644                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3645                 if (ret >= 0)
3646                         break;
3647                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3648         } while (exception.retry);
3649         return ret;
3650 }
3651
3652 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3653 {
3654         struct nfs_server *server = NFS_SERVER(inode);
3655         int ret;
3656
3657         if (!nfs4_server_supports_acls(server))
3658                 return -EOPNOTSUPP;
3659         ret = nfs_revalidate_inode(server, inode);
3660         if (ret < 0)
3661                 return ret;
3662         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3663                 nfs_zap_acl_cache(inode);
3664         ret = nfs4_read_cached_acl(inode, buf, buflen);
3665         if (ret != -ENOENT)
3666                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3667                  * but no cached acl data, just the acl length */
3668                 return ret;
3669         return nfs4_get_acl_uncached(inode, buf, buflen);
3670 }
3671
3672 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3673 {
3674         struct nfs_server *server = NFS_SERVER(inode);
3675         struct page *pages[NFS4ACL_MAXPAGES];
3676         struct nfs_setaclargs arg = {
3677                 .fh             = NFS_FH(inode),
3678                 .acl_pages      = pages,
3679                 .acl_len        = buflen,
3680         };
3681         struct nfs_setaclres res;
3682         struct rpc_message msg = {
3683                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3684                 .rpc_argp       = &arg,
3685                 .rpc_resp       = &res,
3686         };
3687         int ret, i;
3688
3689         if (!nfs4_server_supports_acls(server))
3690                 return -EOPNOTSUPP;
3691         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3692         if (i < 0)
3693                 return i;
3694         nfs_inode_return_delegation(inode);
3695         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3696
3697         /*
3698          * Free each page after tx, so the only ref left is
3699          * held by the network stack
3700          */
3701         for (; i > 0; i--)
3702                 put_page(pages[i-1]);
3703
3704         /*
3705          * Acl update can result in inode attribute update.
3706          * so mark the attribute cache invalid.
3707          */
3708         spin_lock(&inode->i_lock);
3709         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3710         spin_unlock(&inode->i_lock);
3711         nfs_access_zap_cache(inode);
3712         nfs_zap_acl_cache(inode);
3713         return ret;
3714 }
3715
3716 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3717 {
3718         struct nfs4_exception exception = { };
3719         int err;
3720         do {
3721                 err = nfs4_handle_exception(NFS_SERVER(inode),
3722                                 __nfs4_proc_set_acl(inode, buf, buflen),
3723                                 &exception);
3724         } while (exception.retry);
3725         return err;
3726 }
3727
3728 static int
3729 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3730 {
3731         struct nfs_client *clp = server->nfs_client;
3732
3733         if (task->tk_status >= 0)
3734                 return 0;
3735         switch(task->tk_status) {
3736                 case -NFS4ERR_ADMIN_REVOKED:
3737                 case -NFS4ERR_BAD_STATEID:
3738                 case -NFS4ERR_OPENMODE:
3739                         if (state == NULL)
3740                                 break;
3741                         nfs4_schedule_stateid_recovery(server, state);
3742                         goto wait_on_recovery;
3743                 case -NFS4ERR_EXPIRED:
3744                         if (state != NULL)
3745                                 nfs4_schedule_stateid_recovery(server, state);
3746                 case -NFS4ERR_STALE_STATEID:
3747                 case -NFS4ERR_STALE_CLIENTID:
3748                         nfs4_schedule_lease_recovery(clp);
3749                         goto wait_on_recovery;
3750 #if defined(CONFIG_NFS_V4_1)
3751                 case -NFS4ERR_BADSESSION:
3752                 case -NFS4ERR_BADSLOT:
3753                 case -NFS4ERR_BAD_HIGH_SLOT:
3754                 case -NFS4ERR_DEADSESSION:
3755                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3756                 case -NFS4ERR_SEQ_FALSE_RETRY:
3757                 case -NFS4ERR_SEQ_MISORDERED:
3758                         dprintk("%s ERROR %d, Reset session\n", __func__,
3759                                 task->tk_status);
3760                         nfs4_schedule_session_recovery(clp->cl_session);
3761                         task->tk_status = 0;
3762                         return -EAGAIN;
3763 #endif /* CONFIG_NFS_V4_1 */
3764                 case -NFS4ERR_DELAY:
3765                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3766                 case -NFS4ERR_GRACE:
3767                 case -EKEYEXPIRED:
3768                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3769                         task->tk_status = 0;
3770                         return -EAGAIN;
3771                 case -NFS4ERR_RETRY_UNCACHED_REP:
3772                 case -NFS4ERR_OLD_STATEID:
3773                         task->tk_status = 0;
3774                         return -EAGAIN;
3775         }
3776         task->tk_status = nfs4_map_errors(task->tk_status);
3777         return 0;
3778 wait_on_recovery:
3779         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3780         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3781                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3782         task->tk_status = 0;
3783         return -EAGAIN;
3784 }
3785
3786 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3787                 unsigned short port, struct rpc_cred *cred,
3788                 struct nfs4_setclientid_res *res)
3789 {
3790         nfs4_verifier sc_verifier;
3791         struct nfs4_setclientid setclientid = {
3792                 .sc_verifier = &sc_verifier,
3793                 .sc_prog = program,
3794                 .sc_cb_ident = clp->cl_cb_ident,
3795         };
3796         struct rpc_message msg = {
3797                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3798                 .rpc_argp = &setclientid,
3799                 .rpc_resp = res,
3800                 .rpc_cred = cred,
3801         };
3802         __be32 *p;
3803         int loop = 0;
3804         int status;
3805
3806         p = (__be32*)sc_verifier.data;
3807         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3808         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3809
3810         for(;;) {
3811                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3812                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3813                                 clp->cl_ipaddr,
3814                                 rpc_peeraddr2str(clp->cl_rpcclient,
3815                                                         RPC_DISPLAY_ADDR),
3816                                 rpc_peeraddr2str(clp->cl_rpcclient,
3817                                                         RPC_DISPLAY_PROTO),
3818                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3819                                 clp->cl_id_uniquifier);
3820                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3821                                 sizeof(setclientid.sc_netid),
3822                                 rpc_peeraddr2str(clp->cl_rpcclient,
3823                                                         RPC_DISPLAY_NETID));
3824                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3825                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3826                                 clp->cl_ipaddr, port >> 8, port & 255);
3827
3828                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3829                 if (status != -NFS4ERR_CLID_INUSE)
3830                         break;
3831                 if (loop != 0) {
3832                         ++clp->cl_id_uniquifier;
3833                         break;
3834                 }
3835                 ++loop;
3836                 ssleep(clp->cl_lease_time / HZ + 1);
3837         }
3838         return status;
3839 }
3840
3841 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3842                 struct nfs4_setclientid_res *arg,
3843                 struct rpc_cred *cred)
3844 {
3845         struct nfs_fsinfo fsinfo;
3846         struct rpc_message msg = {
3847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3848                 .rpc_argp = arg,
3849                 .rpc_resp = &fsinfo,
3850                 .rpc_cred = cred,
3851         };
3852         unsigned long now;
3853         int status;
3854
3855         now = jiffies;
3856         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3857         if (status == 0) {
3858                 spin_lock(&clp->cl_lock);
3859                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3860                 clp->cl_last_renewal = now;
3861                 spin_unlock(&clp->cl_lock);
3862         }
3863         return status;
3864 }
3865
3866 struct nfs4_delegreturndata {
3867         struct nfs4_delegreturnargs args;
3868         struct nfs4_delegreturnres res;
3869         struct nfs_fh fh;
3870         nfs4_stateid stateid;
3871         unsigned long timestamp;
3872         struct nfs_fattr fattr;
3873         int rpc_status;
3874 };
3875
3876 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3877 {
3878         struct nfs4_delegreturndata *data = calldata;
3879
3880         if (!nfs4_sequence_done(task, &data->res.seq_res))
3881                 return;
3882
3883         switch (task->tk_status) {
3884         case -NFS4ERR_STALE_STATEID:
3885         case -NFS4ERR_EXPIRED:
3886         case 0:
3887                 renew_lease(data->res.server, data->timestamp);
3888                 break;
3889         default:
3890                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3891                                 -EAGAIN) {
3892                         rpc_restart_call_prepare(task);
3893                         return;
3894                 }
3895         }
3896         data->rpc_status = task->tk_status;
3897 }
3898
3899 static void nfs4_delegreturn_release(void *calldata)
3900 {
3901         kfree(calldata);
3902 }
3903
3904 #if defined(CONFIG_NFS_V4_1)
3905 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3906 {
3907         struct nfs4_delegreturndata *d_data;
3908
3909         d_data = (struct nfs4_delegreturndata *)data;
3910
3911         if (nfs4_setup_sequence(d_data->res.server,
3912                                 &d_data->args.seq_args,
3913                                 &d_data->res.seq_res, task))
3914                 return;
3915         rpc_call_start(task);
3916 }
3917 #endif /* CONFIG_NFS_V4_1 */
3918
3919 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3920 #if defined(CONFIG_NFS_V4_1)
3921         .rpc_call_prepare = nfs4_delegreturn_prepare,
3922 #endif /* CONFIG_NFS_V4_1 */
3923         .rpc_call_done = nfs4_delegreturn_done,
3924         .rpc_release = nfs4_delegreturn_release,
3925 };
3926
3927 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3928 {
3929         struct nfs4_delegreturndata *data;
3930         struct nfs_server *server = NFS_SERVER(inode);
3931         struct rpc_task *task;
3932         struct rpc_message msg = {
3933                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3934                 .rpc_cred = cred,
3935         };
3936         struct rpc_task_setup task_setup_data = {
3937                 .rpc_client = server->client,
3938                 .rpc_message = &msg,
3939                 .callback_ops = &nfs4_delegreturn_ops,
3940                 .flags = RPC_TASK_ASYNC,
3941         };
3942         int status = 0;
3943
3944         data = kzalloc(sizeof(*data), GFP_NOFS);
3945         if (data == NULL)
3946                 return -ENOMEM;
3947         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3948         data->args.fhandle = &data->fh;
3949         data->args.stateid = &data->stateid;
3950         data->args.bitmask = server->attr_bitmask;
3951         nfs_copy_fh(&data->fh, NFS_FH(inode));
3952         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3953         data->res.fattr = &data->fattr;
3954         data->res.server = server;
3955         nfs_fattr_init(data->res.fattr);
3956         data->timestamp = jiffies;
3957         data->rpc_status = 0;
3958
3959         task_setup_data.callback_data = data;
3960         msg.rpc_argp = &data->args;
3961         msg.rpc_resp = &data->res;
3962         task = rpc_run_task(&task_setup_data);
3963         if (IS_ERR(task))
3964                 return PTR_ERR(task);
3965         if (!issync)
3966                 goto out;
3967         status = nfs4_wait_for_completion_rpc_task(task);
3968         if (status != 0)
3969                 goto out;
3970         status = data->rpc_status;
3971         if (status != 0)
3972                 goto out;
3973         nfs_refresh_inode(inode, &data->fattr);
3974 out:
3975         rpc_put_task(task);
3976         return status;
3977 }
3978
3979 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3980 {
3981         struct nfs_server *server = NFS_SERVER(inode);
3982         struct nfs4_exception exception = { };
3983         int err;
3984         do {
3985                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3986                 switch (err) {
3987                         case -NFS4ERR_STALE_STATEID:
3988                         case -NFS4ERR_EXPIRED:
3989                         case 0:
3990                                 return 0;
3991                 }
3992                 err = nfs4_handle_exception(server, err, &exception);
3993         } while (exception.retry);
3994         return err;
3995 }
3996
3997 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3998 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3999
4000 /*
4001  * sleep, with exponential backoff, and retry the LOCK operation.
4002  */
4003 static unsigned long
4004 nfs4_set_lock_task_retry(unsigned long timeout)
4005 {
4006         freezable_schedule_timeout_killable(timeout);
4007         timeout <<= 1;
4008         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4009                 return NFS4_LOCK_MAXTIMEOUT;
4010         return timeout;
4011 }
4012
4013 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4014 {
4015         struct inode *inode = state->inode;
4016         struct nfs_server *server = NFS_SERVER(inode);
4017         struct nfs_client *clp = server->nfs_client;
4018         struct nfs_lockt_args arg = {
4019                 .fh = NFS_FH(inode),
4020                 .fl = request,
4021         };
4022         struct nfs_lockt_res res = {
4023                 .denied = request,
4024         };
4025         struct rpc_message msg = {
4026                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4027                 .rpc_argp       = &arg,
4028                 .rpc_resp       = &res,
4029                 .rpc_cred       = state->owner->so_cred,
4030         };
4031         struct nfs4_lock_state *lsp;
4032         int status;
4033
4034         arg.lock_owner.clientid = clp->cl_clientid;
4035         status = nfs4_set_lock_state(state, request);
4036         if (status != 0)
4037                 goto out;
4038         lsp = request->fl_u.nfs4_fl.owner;
4039         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4040         arg.lock_owner.s_dev = server->s_dev;
4041         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4042         switch (status) {
4043                 case 0:
4044                         request->fl_type = F_UNLCK;
4045                         break;
4046                 case -NFS4ERR_DENIED:
4047                         status = 0;
4048         }
4049         request->fl_ops->fl_release_private(request);
4050 out:
4051         return status;
4052 }
4053
4054 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4055 {
4056         struct nfs4_exception exception = { };
4057         int err;
4058
4059         do {
4060                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4061                                 _nfs4_proc_getlk(state, cmd, request),
4062                                 &exception);
4063         } while (exception.retry);
4064         return err;
4065 }
4066
4067 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4068 {
4069         int res = 0;
4070         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4071                 case FL_POSIX:
4072                         res = posix_lock_file_wait(file, fl);
4073                         break;
4074                 case FL_FLOCK:
4075                         res = flock_lock_file_wait(file, fl);
4076                         break;
4077                 default:
4078                         BUG();
4079         }
4080         return res;
4081 }
4082
4083 struct nfs4_unlockdata {
4084         struct nfs_locku_args arg;
4085         struct nfs_locku_res res;
4086         struct nfs4_lock_state *lsp;
4087         struct nfs_open_context *ctx;
4088         struct file_lock fl;
4089         const struct nfs_server *server;
4090         unsigned long timestamp;
4091 };
4092
4093 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4094                 struct nfs_open_context *ctx,
4095                 struct nfs4_lock_state *lsp,
4096                 struct nfs_seqid *seqid)
4097 {
4098         struct nfs4_unlockdata *p;
4099         struct inode *inode = lsp->ls_state->inode;
4100
4101         p = kzalloc(sizeof(*p), GFP_NOFS);
4102         if (p == NULL)
4103                 return NULL;
4104         p->arg.fh = NFS_FH(inode);
4105         p->arg.fl = &p->fl;
4106         p->arg.seqid = seqid;
4107         p->res.seqid = seqid;
4108         p->arg.stateid = &lsp->ls_stateid;
4109         p->lsp = lsp;
4110         atomic_inc(&lsp->ls_count);
4111         /* Ensure we don't close file until we're done freeing locks! */
4112         p->ctx = get_nfs_open_context(ctx);
4113         memcpy(&p->fl, fl, sizeof(p->fl));
4114         p->server = NFS_SERVER(inode);
4115         return p;
4116 }
4117
4118 static void nfs4_locku_release_calldata(void *data)
4119 {
4120         struct nfs4_unlockdata *calldata = data;
4121         nfs_free_seqid(calldata->arg.seqid);
4122         nfs4_put_lock_state(calldata->lsp);
4123         put_nfs_open_context(calldata->ctx);
4124         kfree(calldata);
4125 }
4126
4127 static void nfs4_locku_done(struct rpc_task *task, void *data)
4128 {
4129         struct nfs4_unlockdata *calldata = data;
4130
4131         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4132                 return;
4133         switch (task->tk_status) {
4134                 case 0:
4135                         memcpy(calldata->lsp->ls_stateid.data,
4136                                         calldata->res.stateid.data,
4137                                         sizeof(calldata->lsp->ls_stateid.data));
4138                         renew_lease(calldata->server, calldata->timestamp);
4139                         break;
4140                 case -NFS4ERR_BAD_STATEID:
4141                 case -NFS4ERR_OLD_STATEID:
4142                 case -NFS4ERR_STALE_STATEID:
4143                 case -NFS4ERR_EXPIRED:
4144                         break;
4145                 default:
4146                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4147                                 rpc_restart_call_prepare(task);
4148         }
4149 }
4150
4151 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4152 {
4153         struct nfs4_unlockdata *calldata = data;
4154
4155         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4156                 return;
4157         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4158                 /* Note: exit _without_ running nfs4_locku_done */
4159                 task->tk_action = NULL;
4160                 return;
4161         }
4162         calldata->timestamp = jiffies;
4163         if (nfs4_setup_sequence(calldata->server,
4164                                 &calldata->arg.seq_args,
4165                                 &calldata->res.seq_res, task))
4166                 return;
4167         rpc_call_start(task);
4168 }
4169
4170 static const struct rpc_call_ops nfs4_locku_ops = {
4171         .rpc_call_prepare = nfs4_locku_prepare,
4172         .rpc_call_done = nfs4_locku_done,
4173         .rpc_release = nfs4_locku_release_calldata,
4174 };
4175
4176 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4177                 struct nfs_open_context *ctx,
4178                 struct nfs4_lock_state *lsp,
4179                 struct nfs_seqid *seqid)
4180 {
4181         struct nfs4_unlockdata *data;
4182         struct rpc_message msg = {
4183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4184                 .rpc_cred = ctx->cred,
4185         };
4186         struct rpc_task_setup task_setup_data = {
4187                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4188                 .rpc_message = &msg,
4189                 .callback_ops = &nfs4_locku_ops,
4190                 .workqueue = nfsiod_workqueue,
4191                 .flags = RPC_TASK_ASYNC,
4192         };
4193
4194         /* Ensure this is an unlock - when canceling a lock, the
4195          * canceled lock is passed in, and it won't be an unlock.
4196          */
4197         fl->fl_type = F_UNLCK;
4198
4199         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4200         if (data == NULL) {
4201                 nfs_free_seqid(seqid);
4202                 return ERR_PTR(-ENOMEM);
4203         }
4204
4205         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4206         msg.rpc_argp = &data->arg;
4207         msg.rpc_resp = &data->res;
4208         task_setup_data.callback_data = data;
4209         return rpc_run_task(&task_setup_data);
4210 }
4211
4212 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4213 {
4214         struct nfs_inode *nfsi = NFS_I(state->inode);
4215         struct nfs_seqid *seqid;
4216         struct nfs4_lock_state *lsp;
4217         struct rpc_task *task;
4218         int status = 0;
4219         unsigned char fl_flags = request->fl_flags;
4220
4221         status = nfs4_set_lock_state(state, request);
4222         /* Unlock _before_ we do the RPC call */
4223         request->fl_flags |= FL_EXISTS;
4224         down_read(&nfsi->rwsem);
4225         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4226                 up_read(&nfsi->rwsem);
4227                 goto out;
4228         }
4229         up_read(&nfsi->rwsem);
4230         if (status != 0)
4231                 goto out;
4232         /* Is this a delegated lock? */
4233         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4234                 goto out;
4235         lsp = request->fl_u.nfs4_fl.owner;
4236         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4237         status = -ENOMEM;
4238         if (seqid == NULL)
4239                 goto out;
4240         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4241         status = PTR_ERR(task);
4242         if (IS_ERR(task))
4243                 goto out;
4244         status = nfs4_wait_for_completion_rpc_task(task);
4245         rpc_put_task(task);
4246 out:
4247         request->fl_flags = fl_flags;
4248         return status;
4249 }
4250
4251 struct nfs4_lockdata {
4252         struct nfs_lock_args arg;
4253         struct nfs_lock_res res;
4254         struct nfs4_lock_state *lsp;
4255         struct nfs_open_context *ctx;
4256         struct file_lock fl;
4257         unsigned long timestamp;
4258         int rpc_status;
4259         int cancelled;
4260         struct nfs_server *server;
4261 };
4262
4263 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4264                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4265                 gfp_t gfp_mask)
4266 {
4267         struct nfs4_lockdata *p;
4268         struct inode *inode = lsp->ls_state->inode;
4269         struct nfs_server *server = NFS_SERVER(inode);
4270
4271         p = kzalloc(sizeof(*p), gfp_mask);
4272         if (p == NULL)
4273                 return NULL;
4274
4275         p->arg.fh = NFS_FH(inode);
4276         p->arg.fl = &p->fl;
4277         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4278         if (p->arg.open_seqid == NULL)
4279                 goto out_free;
4280         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4281         if (p->arg.lock_seqid == NULL)
4282                 goto out_free_seqid;
4283         p->arg.lock_stateid = &lsp->ls_stateid;
4284         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4285         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4286         p->arg.lock_owner.s_dev = server->s_dev;
4287         p->res.lock_seqid = p->arg.lock_seqid;
4288         p->lsp = lsp;
4289         p->server = server;
4290         atomic_inc(&lsp->ls_count);
4291         p->ctx = get_nfs_open_context(ctx);
4292         memcpy(&p->fl, fl, sizeof(p->fl));
4293         return p;
4294 out_free_seqid:
4295         nfs_free_seqid(p->arg.open_seqid);
4296 out_free:
4297         kfree(p);
4298         return NULL;
4299 }
4300
4301 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4302 {
4303         struct nfs4_lockdata *data = calldata;
4304         struct nfs4_state *state = data->lsp->ls_state;
4305
4306         dprintk("%s: begin!\n", __func__);
4307         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4308                 return;
4309         /* Do we need to do an open_to_lock_owner? */
4310         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4311                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4312                         return;
4313                 data->arg.open_stateid = &state->stateid;
4314                 data->arg.new_lock_owner = 1;
4315                 data->res.open_seqid = data->arg.open_seqid;
4316         } else
4317                 data->arg.new_lock_owner = 0;
4318         data->timestamp = jiffies;
4319         if (nfs4_setup_sequence(data->server,
4320                                 &data->arg.seq_args,
4321                                 &data->res.seq_res, task))
4322                 return;
4323         rpc_call_start(task);
4324         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4325 }
4326
4327 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4328 {
4329         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4330         nfs4_lock_prepare(task, calldata);
4331 }
4332
4333 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4334 {
4335         struct nfs4_lockdata *data = calldata;
4336
4337         dprintk("%s: begin!\n", __func__);
4338
4339         if (!nfs4_sequence_done(task, &data->res.seq_res))
4340                 return;
4341
4342         data->rpc_status = task->tk_status;
4343         if (data->arg.new_lock_owner != 0) {
4344                 if (data->rpc_status == 0)
4345                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4346                 else
4347                         goto out;
4348         }
4349         if (data->rpc_status == 0) {
4350                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4351                                         sizeof(data->lsp->ls_stateid.data));
4352                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4353                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4354         }
4355 out:
4356         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4357 }
4358
4359 static void nfs4_lock_release(void *calldata)
4360 {
4361         struct nfs4_lockdata *data = calldata;
4362
4363         dprintk("%s: begin!\n", __func__);
4364         nfs_free_seqid(data->arg.open_seqid);
4365         if (data->cancelled != 0) {
4366                 struct rpc_task *task;
4367                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4368                                 data->arg.lock_seqid);
4369                 if (!IS_ERR(task))
4370                         rpc_put_task_async(task);
4371                 dprintk("%s: cancelling lock!\n", __func__);
4372         } else
4373                 nfs_free_seqid(data->arg.lock_seqid);
4374         nfs4_put_lock_state(data->lsp);
4375         put_nfs_open_context(data->ctx);
4376         kfree(data);
4377         dprintk("%s: done!\n", __func__);
4378 }
4379
4380 static const struct rpc_call_ops nfs4_lock_ops = {
4381         .rpc_call_prepare = nfs4_lock_prepare,
4382         .rpc_call_done = nfs4_lock_done,
4383         .rpc_release = nfs4_lock_release,
4384 };
4385
4386 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4387         .rpc_call_prepare = nfs4_recover_lock_prepare,
4388         .rpc_call_done = nfs4_lock_done,
4389         .rpc_release = nfs4_lock_release,
4390 };
4391
4392 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4393 {
4394         switch (error) {
4395         case -NFS4ERR_ADMIN_REVOKED:
4396         case -NFS4ERR_BAD_STATEID:
4397                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4398                 if (new_lock_owner != 0 ||
4399                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4400                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4401                 break;
4402         case -NFS4ERR_STALE_STATEID:
4403                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4404         case -NFS4ERR_EXPIRED:
4405                 nfs4_schedule_lease_recovery(server->nfs_client);
4406         };
4407 }
4408
4409 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4410 {
4411         struct nfs4_lockdata *data;
4412         struct rpc_task *task;
4413         struct rpc_message msg = {
4414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4415                 .rpc_cred = state->owner->so_cred,
4416         };
4417         struct rpc_task_setup task_setup_data = {
4418                 .rpc_client = NFS_CLIENT(state->inode),
4419                 .rpc_message = &msg,
4420                 .callback_ops = &nfs4_lock_ops,
4421                 .workqueue = nfsiod_workqueue,
4422                 .flags = RPC_TASK_ASYNC,
4423         };
4424         int ret;
4425
4426         dprintk("%s: begin!\n", __func__);
4427         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4428                         fl->fl_u.nfs4_fl.owner,
4429                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4430         if (data == NULL)
4431                 return -ENOMEM;
4432         if (IS_SETLKW(cmd))
4433                 data->arg.block = 1;
4434         if (recovery_type > NFS_LOCK_NEW) {
4435                 if (recovery_type == NFS_LOCK_RECLAIM)
4436                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4437                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4438         }
4439         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4440         msg.rpc_argp = &data->arg;
4441         msg.rpc_resp = &data->res;
4442         task_setup_data.callback_data = data;
4443         task = rpc_run_task(&task_setup_data);
4444         if (IS_ERR(task))
4445                 return PTR_ERR(task);
4446         ret = nfs4_wait_for_completion_rpc_task(task);
4447         if (ret == 0) {
4448                 ret = data->rpc_status;
4449                 if (ret)
4450                         nfs4_handle_setlk_error(data->server, data->lsp,
4451                                         data->arg.new_lock_owner, ret);
4452         } else
4453                 data->cancelled = 1;
4454         rpc_put_task(task);
4455         dprintk("%s: done, ret = %d!\n", __func__, ret);
4456         return ret;
4457 }
4458
4459 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4460 {
4461         struct nfs_server *server = NFS_SERVER(state->inode);
4462         struct nfs4_exception exception = { };
4463         int err;
4464
4465         do {
4466                 /* Cache the lock if possible... */
4467                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4468                         return 0;
4469                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4470                 if (err != -NFS4ERR_DELAY)
4471                         break;
4472                 nfs4_handle_exception(server, err, &exception);
4473         } while (exception.retry);
4474         return err;
4475 }
4476
4477 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4478 {
4479         struct nfs_server *server = NFS_SERVER(state->inode);
4480         struct nfs4_exception exception = { };
4481         int err;
4482
4483         err = nfs4_set_lock_state(state, request);
4484         if (err != 0)
4485                 return err;
4486         do {
4487                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4488                         return 0;
4489                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4490                 switch (err) {
4491                 default:
4492                         goto out;
4493                 case -NFS4ERR_GRACE:
4494                 case -NFS4ERR_DELAY:
4495                         nfs4_handle_exception(server, err, &exception);
4496                         err = 0;
4497                 }
4498         } while (exception.retry);
4499 out:
4500         return err;
4501 }
4502
4503 #if defined(CONFIG_NFS_V4_1)
4504 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4505 {
4506         int status;
4507         struct nfs_server *server = NFS_SERVER(state->inode);
4508
4509         status = nfs41_test_stateid(server, state);
4510         if (status == NFS_OK)
4511                 return 0;
4512         nfs41_free_stateid(server, state);
4513         return nfs4_lock_expired(state, request);
4514 }
4515 #endif
4516
4517 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4518 {
4519         struct nfs_inode *nfsi = NFS_I(state->inode);
4520         unsigned char fl_flags = request->fl_flags;
4521         int status = -ENOLCK;
4522
4523         if ((fl_flags & FL_POSIX) &&
4524                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4525                 goto out;
4526         /* Is this a delegated open? */
4527         status = nfs4_set_lock_state(state, request);
4528         if (status != 0)
4529                 goto out;
4530         request->fl_flags |= FL_ACCESS;
4531         status = do_vfs_lock(request->fl_file, request);
4532         if (status < 0)
4533                 goto out;
4534         down_read(&nfsi->rwsem);
4535         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4536                 /* Yes: cache locks! */
4537                 /* ...but avoid races with delegation recall... */
4538                 request->fl_flags = fl_flags & ~FL_SLEEP;
4539                 status = do_vfs_lock(request->fl_file, request);
4540                 goto out_unlock;
4541         }
4542         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4543         if (status != 0)
4544                 goto out_unlock;
4545         /* Note: we always want to sleep here! */
4546         request->fl_flags = fl_flags | FL_SLEEP;
4547         if (do_vfs_lock(request->fl_file, request) < 0)
4548                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4549 out_unlock:
4550         up_read(&nfsi->rwsem);
4551 out:
4552         request->fl_flags = fl_flags;
4553         return status;
4554 }
4555
4556 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4557 {
4558         struct nfs4_exception exception = { };
4559         int err;
4560
4561         do {
4562                 err = _nfs4_proc_setlk(state, cmd, request);
4563                 if (err == -NFS4ERR_DENIED)
4564                         err = -EAGAIN;
4565                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4566                                 err, &exception);
4567         } while (exception.retry);
4568         return err;
4569 }
4570
4571 static int
4572 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4573 {
4574         struct nfs_open_context *ctx;
4575         struct nfs4_state *state;
4576         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4577         int status;
4578
4579         /* verify open state */
4580         ctx = nfs_file_open_context(filp);
4581         state = ctx->state;
4582
4583         if (request->fl_start < 0 || request->fl_end < 0)
4584                 return -EINVAL;
4585
4586         if (IS_GETLK(cmd)) {
4587                 if (state != NULL)
4588                         return nfs4_proc_getlk(state, F_GETLK, request);
4589                 return 0;
4590         }
4591
4592         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4593                 return -EINVAL;
4594
4595         if (request->fl_type == F_UNLCK) {
4596                 if (state != NULL)
4597                         return nfs4_proc_unlck(state, cmd, request);
4598                 return 0;
4599         }
4600
4601         if (state == NULL)
4602                 return -ENOLCK;
4603         do {
4604                 status = nfs4_proc_setlk(state, cmd, request);
4605                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4606                         break;
4607                 timeout = nfs4_set_lock_task_retry(timeout);
4608                 status = -ERESTARTSYS;
4609                 if (signalled())
4610                         break;
4611         } while(status < 0);
4612         return status;
4613 }
4614
4615 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4616 {
4617         struct nfs_server *server = NFS_SERVER(state->inode);
4618         struct nfs4_exception exception = { };
4619         int err;
4620
4621         err = nfs4_set_lock_state(state, fl);
4622         if (err != 0)
4623                 goto out;
4624         do {
4625                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4626                 switch (err) {
4627                         default:
4628                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4629                                                 __func__, err);
4630                         case 0:
4631                         case -ESTALE:
4632                                 goto out;
4633                         case -NFS4ERR_EXPIRED:
4634                                 nfs4_schedule_stateid_recovery(server, state);
4635                         case -NFS4ERR_STALE_CLIENTID:
4636                         case -NFS4ERR_STALE_STATEID:
4637                                 nfs4_schedule_lease_recovery(server->nfs_client);
4638                                 goto out;
4639                         case -NFS4ERR_BADSESSION:
4640                         case -NFS4ERR_BADSLOT:
4641                         case -NFS4ERR_BAD_HIGH_SLOT:
4642                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4643                         case -NFS4ERR_DEADSESSION:
4644                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4645                                 goto out;
4646                         case -ERESTARTSYS:
4647                                 /*
4648                                  * The show must go on: exit, but mark the
4649                                  * stateid as needing recovery.
4650                                  */
4651                         case -NFS4ERR_ADMIN_REVOKED:
4652                         case -NFS4ERR_BAD_STATEID:
4653                         case -NFS4ERR_OPENMODE:
4654                                 nfs4_schedule_stateid_recovery(server, state);
4655                                 err = 0;
4656                                 goto out;
4657                         case -EKEYEXPIRED:
4658                                 /*
4659                                  * User RPCSEC_GSS context has expired.
4660                                  * We cannot recover this stateid now, so
4661                                  * skip it and allow recovery thread to
4662                                  * proceed.
4663                                  */
4664                                 err = 0;
4665                                 goto out;
4666                         case -ENOMEM:
4667                         case -NFS4ERR_DENIED:
4668                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4669                                 err = 0;
4670                                 goto out;
4671                         case -NFS4ERR_DELAY:
4672                                 break;
4673                 }
4674                 err = nfs4_handle_exception(server, err, &exception);
4675         } while (exception.retry);
4676 out:
4677         return err;
4678 }
4679
4680 static void nfs4_release_lockowner_release(void *calldata)
4681 {
4682         kfree(calldata);
4683 }
4684
4685 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4686         .rpc_release = nfs4_release_lockowner_release,
4687 };
4688
4689 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4690 {
4691         struct nfs_server *server = lsp->ls_state->owner->so_server;
4692         struct nfs_release_lockowner_args *args;
4693         struct rpc_message msg = {
4694                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4695         };
4696
4697         if (server->nfs_client->cl_mvops->minor_version != 0)
4698                 return;
4699         args = kmalloc(sizeof(*args), GFP_NOFS);
4700         if (!args)
4701                 return;
4702         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4703         args->lock_owner.id = lsp->ls_seqid.owner_id;
4704         args->lock_owner.s_dev = server->s_dev;
4705         msg.rpc_argp = args;
4706         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4707 }
4708
4709 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4710
4711 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4712                                    const void *buf, size_t buflen,
4713                                    int flags, int type)
4714 {
4715         if (strcmp(key, "") != 0)
4716                 return -EINVAL;
4717
4718         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4719 }
4720
4721 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4722                                    void *buf, size_t buflen, int type)
4723 {
4724         if (strcmp(key, "") != 0)
4725                 return -EINVAL;
4726
4727         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4728 }
4729
4730 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4731                                        size_t list_len, const char *name,
4732                                        size_t name_len, int type)
4733 {
4734         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4735
4736         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4737                 return 0;
4738
4739         if (list && len <= list_len)
4740                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4741         return len;
4742 }
4743
4744 /*
4745  * nfs_fhget will use either the mounted_on_fileid or the fileid
4746  */
4747 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4748 {
4749         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4750                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4751               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4752               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4753                 return;
4754
4755         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4756                 NFS_ATTR_FATTR_NLINK;
4757         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4758         fattr->nlink = 2;
4759 }
4760
4761 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4762                 struct nfs4_fs_locations *fs_locations, struct page *page)
4763 {
4764         struct nfs_server *server = NFS_SERVER(dir);
4765         u32 bitmask[2] = {
4766                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4767         };
4768         struct nfs4_fs_locations_arg args = {
4769                 .dir_fh = NFS_FH(dir),
4770                 .name = name,
4771                 .page = page,
4772                 .bitmask = bitmask,
4773         };
4774         struct nfs4_fs_locations_res res = {
4775                 .fs_locations = fs_locations,
4776         };
4777         struct rpc_message msg = {
4778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4779                 .rpc_argp = &args,
4780                 .rpc_resp = &res,
4781         };
4782         int status;
4783
4784         dprintk("%s: start\n", __func__);
4785
4786         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4787          * is not supported */
4788         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4789                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4790         else
4791                 bitmask[0] |= FATTR4_WORD0_FILEID;
4792
4793         nfs_fattr_init(&fs_locations->fattr);
4794         fs_locations->server = server;
4795         fs_locations->nlocations = 0;
4796         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4797         dprintk("%s: returned status = %d\n", __func__, status);
4798         return status;
4799 }
4800
4801 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4802 {
4803         int status;
4804         struct nfs4_secinfo_arg args = {
4805                 .dir_fh = NFS_FH(dir),
4806                 .name   = name,
4807         };
4808         struct nfs4_secinfo_res res = {
4809                 .flavors     = flavors,
4810         };
4811         struct rpc_message msg = {
4812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4813                 .rpc_argp = &args,
4814                 .rpc_resp = &res,
4815         };
4816
4817         dprintk("NFS call  secinfo %s\n", name->name);
4818         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4819         dprintk("NFS reply  secinfo: %d\n", status);
4820         return status;
4821 }
4822
4823 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4824 {
4825         struct nfs4_exception exception = { };
4826         int err;
4827         do {
4828                 err = nfs4_handle_exception(NFS_SERVER(dir),
4829                                 _nfs4_proc_secinfo(dir, name, flavors),
4830                                 &exception);
4831         } while (exception.retry);
4832         return err;
4833 }
4834
4835 #ifdef CONFIG_NFS_V4_1
4836 /*
4837  * Check the exchange flags returned by the server for invalid flags, having
4838  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4839  * DS flags set.
4840  */
4841 static int nfs4_check_cl_exchange_flags(u32 flags)
4842 {
4843         if (flags & ~EXCHGID4_FLAG_MASK_R)
4844                 goto out_inval;
4845         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4846             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4847                 goto out_inval;
4848         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4849                 goto out_inval;
4850         return NFS_OK;
4851 out_inval:
4852         return -NFS4ERR_INVAL;
4853 }
4854
4855 static bool
4856 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4857 {
4858         if (a->server_scope_sz == b->server_scope_sz &&
4859             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4860                 return true;
4861
4862         return false;
4863 }
4864
4865 /*
4866  * nfs4_proc_exchange_id()
4867  *
4868  * Since the clientid has expired, all compounds using sessions
4869  * associated with the stale clientid will be returning
4870  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4871  * be in some phase of session reset.
4872  */
4873 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4874 {
4875         nfs4_verifier verifier;
4876         struct nfs41_exchange_id_args args = {
4877                 .client = clp,
4878                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4879         };
4880         struct nfs41_exchange_id_res res = {
4881                 .client = clp,
4882         };
4883         int status;
4884         struct rpc_message msg = {
4885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4886                 .rpc_argp = &args,
4887                 .rpc_resp = &res,
4888                 .rpc_cred = cred,
4889         };
4890         __be32 *p;
4891
4892         dprintk("--> %s\n", __func__);
4893         BUG_ON(clp == NULL);
4894
4895         p = (u32 *)verifier.data;
4896         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4897         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4898         args.verifier = &verifier;
4899
4900         args.id_len = scnprintf(args.id, sizeof(args.id),
4901                                 "%s/%s.%s/%u",
4902                                 clp->cl_ipaddr,
4903                                 init_utsname()->nodename,
4904                                 init_utsname()->domainname,
4905                                 clp->cl_rpcclient->cl_auth->au_flavor);
4906
4907         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4908         if (unlikely(!res.server_scope))
4909                 return -ENOMEM;
4910
4911         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4912         if (!status)
4913                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4914
4915         if (!status) {
4916                 if (clp->server_scope &&
4917                     !nfs41_same_server_scope(clp->server_scope,
4918                                              res.server_scope)) {
4919                         dprintk("%s: server_scope mismatch detected\n",
4920                                 __func__);
4921                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4922                         kfree(clp->server_scope);
4923                         clp->server_scope = NULL;
4924                 }
4925
4926                 if (!clp->server_scope)
4927                         clp->server_scope = res.server_scope;
4928                 else
4929                         kfree(res.server_scope);
4930         }
4931
4932         dprintk("<-- %s status= %d\n", __func__, status);
4933         return status;
4934 }
4935
4936 struct nfs4_get_lease_time_data {
4937         struct nfs4_get_lease_time_args *args;
4938         struct nfs4_get_lease_time_res *res;
4939         struct nfs_client *clp;
4940 };
4941
4942 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4943                                         void *calldata)
4944 {
4945         int ret;
4946         struct nfs4_get_lease_time_data *data =
4947                         (struct nfs4_get_lease_time_data *)calldata;
4948
4949         dprintk("--> %s\n", __func__);
4950         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4951         /* just setup sequence, do not trigger session recovery
4952            since we're invoked within one */
4953         ret = nfs41_setup_sequence(data->clp->cl_session,
4954                                    &data->args->la_seq_args,
4955                                    &data->res->lr_seq_res, task);
4956
4957         BUG_ON(ret == -EAGAIN);
4958         rpc_call_start(task);
4959         dprintk("<-- %s\n", __func__);
4960 }
4961
4962 /*
4963  * Called from nfs4_state_manager thread for session setup, so don't recover
4964  * from sequence operation or clientid errors.
4965  */
4966 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4967 {
4968         struct nfs4_get_lease_time_data *data =
4969                         (struct nfs4_get_lease_time_data *)calldata;
4970
4971         dprintk("--> %s\n", __func__);
4972         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4973                 return;
4974         switch (task->tk_status) {
4975         case -NFS4ERR_DELAY:
4976         case -NFS4ERR_GRACE:
4977                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4978                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4979                 task->tk_status = 0;
4980                 /* fall through */
4981         case -NFS4ERR_RETRY_UNCACHED_REP:
4982                 rpc_restart_call_prepare(task);
4983                 return;
4984         }
4985         dprintk("<-- %s\n", __func__);
4986 }
4987
4988 struct rpc_call_ops nfs4_get_lease_time_ops = {
4989         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4990         .rpc_call_done = nfs4_get_lease_time_done,
4991 };
4992
4993 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4994 {
4995         struct rpc_task *task;
4996         struct nfs4_get_lease_time_args args;
4997         struct nfs4_get_lease_time_res res = {
4998                 .lr_fsinfo = fsinfo,
4999         };
5000         struct nfs4_get_lease_time_data data = {
5001                 .args = &args,
5002                 .res = &res,
5003                 .clp = clp,
5004         };
5005         struct rpc_message msg = {
5006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5007                 .rpc_argp = &args,
5008                 .rpc_resp = &res,
5009         };
5010         struct rpc_task_setup task_setup = {
5011                 .rpc_client = clp->cl_rpcclient,
5012                 .rpc_message = &msg,
5013                 .callback_ops = &nfs4_get_lease_time_ops,
5014                 .callback_data = &data,
5015                 .flags = RPC_TASK_TIMEOUT,
5016         };
5017         int status;
5018
5019         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5020         dprintk("--> %s\n", __func__);
5021         task = rpc_run_task(&task_setup);
5022
5023         if (IS_ERR(task))
5024                 status = PTR_ERR(task);
5025         else {
5026                 status = task->tk_status;
5027                 rpc_put_task(task);
5028         }
5029         dprintk("<-- %s return %d\n", __func__, status);
5030
5031         return status;
5032 }
5033
5034 /*
5035  * Reset a slot table
5036  */
5037 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5038                                  int ivalue)
5039 {
5040         struct nfs4_slot *new = NULL;
5041         int i;
5042         int ret = 0;
5043
5044         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5045                 max_reqs, tbl->max_slots);
5046
5047         /* Does the newly negotiated max_reqs match the existing slot table? */
5048         if (max_reqs != tbl->max_slots) {
5049                 ret = -ENOMEM;
5050                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5051                               GFP_NOFS);
5052                 if (!new)
5053                         goto out;
5054                 ret = 0;
5055                 kfree(tbl->slots);
5056         }
5057         spin_lock(&tbl->slot_tbl_lock);
5058         if (new) {
5059                 tbl->slots = new;
5060                 tbl->max_slots = max_reqs;
5061         }
5062         for (i = 0; i < tbl->max_slots; ++i)
5063                 tbl->slots[i].seq_nr = ivalue;
5064         spin_unlock(&tbl->slot_tbl_lock);
5065         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5066                 tbl, tbl->slots, tbl->max_slots);
5067 out:
5068         dprintk("<-- %s: return %d\n", __func__, ret);
5069         return ret;
5070 }
5071
5072 /* Destroy the slot table */
5073 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5074 {
5075         if (session->fc_slot_table.slots != NULL) {
5076                 kfree(session->fc_slot_table.slots);
5077                 session->fc_slot_table.slots = NULL;
5078         }
5079         if (session->bc_slot_table.slots != NULL) {
5080                 kfree(session->bc_slot_table.slots);
5081                 session->bc_slot_table.slots = NULL;
5082         }
5083         return;
5084 }
5085
5086 /*
5087  * Initialize slot table
5088  */
5089 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5090                 int max_slots, int ivalue)
5091 {
5092         struct nfs4_slot *slot;
5093         int ret = -ENOMEM;
5094
5095         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5096
5097         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5098
5099         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5100         if (!slot)
5101                 goto out;
5102         ret = 0;
5103
5104         spin_lock(&tbl->slot_tbl_lock);
5105         tbl->max_slots = max_slots;
5106         tbl->slots = slot;
5107         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5108         spin_unlock(&tbl->slot_tbl_lock);
5109         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5110                 tbl, tbl->slots, tbl->max_slots);
5111 out:
5112         dprintk("<-- %s: return %d\n", __func__, ret);
5113         return ret;
5114 }
5115
5116 /*
5117  * Initialize or reset the forechannel and backchannel tables
5118  */
5119 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5120 {
5121         struct nfs4_slot_table *tbl;
5122         int status;
5123
5124         dprintk("--> %s\n", __func__);
5125         /* Fore channel */
5126         tbl = &ses->fc_slot_table;
5127         if (tbl->slots == NULL) {
5128                 status = nfs4_init_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5129                 if (status) /* -ENOMEM */
5130                         return status;
5131         } else {
5132                 status = nfs4_reset_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5133                 if (status)
5134                         return status;
5135         }
5136         /* Back channel */
5137         tbl = &ses->bc_slot_table;
5138         if (tbl->slots == NULL) {
5139                 status = nfs4_init_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5140                 if (status)
5141                         /* Fore and back channel share a connection so get
5142                          * both slot tables or neither */
5143                         nfs4_destroy_slot_tables(ses);
5144         } else
5145                 status = nfs4_reset_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5146         return status;
5147 }
5148
5149 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5150 {
5151         struct nfs4_session *session;
5152         struct nfs4_slot_table *tbl;
5153
5154         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5155         if (!session)
5156                 return NULL;
5157
5158         tbl = &session->fc_slot_table;
5159         tbl->highest_used_slotid = -1;
5160         spin_lock_init(&tbl->slot_tbl_lock);
5161         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5162         init_completion(&tbl->complete);
5163
5164         tbl = &session->bc_slot_table;
5165         tbl->highest_used_slotid = -1;
5166         spin_lock_init(&tbl->slot_tbl_lock);
5167         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5168         init_completion(&tbl->complete);
5169
5170         session->session_state = 1<<NFS4_SESSION_INITING;
5171
5172         session->clp = clp;
5173         return session;
5174 }
5175
5176 void nfs4_destroy_session(struct nfs4_session *session)
5177 {
5178         nfs4_proc_destroy_session(session);
5179         dprintk("%s Destroy backchannel for xprt %p\n",
5180                 __func__, session->clp->cl_rpcclient->cl_xprt);
5181         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5182                                 NFS41_BC_MIN_CALLBACKS);
5183         nfs4_destroy_slot_tables(session);
5184         kfree(session);
5185 }
5186
5187 /*
5188  * Initialize the values to be used by the client in CREATE_SESSION
5189  * If nfs4_init_session set the fore channel request and response sizes,
5190  * use them.
5191  *
5192  * Set the back channel max_resp_sz_cached to zero to force the client to
5193  * always set csa_cachethis to FALSE because the current implementation
5194  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5195  */
5196 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5197 {
5198         struct nfs4_session *session = args->client->cl_session;
5199         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5200                      mxresp_sz = session->fc_attrs.max_resp_sz;
5201
5202         if (mxrqst_sz == 0)
5203                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5204         if (mxresp_sz == 0)
5205                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5206         /* Fore channel attributes */
5207         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5208         args->fc_attrs.max_resp_sz = mxresp_sz;
5209         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5210         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5211
5212         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5213                 "max_ops=%u max_reqs=%u\n",
5214                 __func__,
5215                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5216                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5217
5218         /* Back channel attributes */
5219         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5220         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5221         args->bc_attrs.max_resp_sz_cached = 0;
5222         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5223         args->bc_attrs.max_reqs = 1;
5224
5225         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5226                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5227                 __func__,
5228                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5229                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5230                 args->bc_attrs.max_reqs);
5231 }
5232
5233 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5234 {
5235         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5236         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5237
5238         if (rcvd->max_resp_sz > sent->max_resp_sz)
5239                 return -EINVAL;
5240         /*
5241          * Our requested max_ops is the minimum we need; we're not
5242          * prepared to break up compounds into smaller pieces than that.
5243          * So, no point even trying to continue if the server won't
5244          * cooperate:
5245          */
5246         if (rcvd->max_ops < sent->max_ops)
5247                 return -EINVAL;
5248         if (rcvd->max_reqs == 0)
5249                 return -EINVAL;
5250         return 0;
5251 }
5252
5253 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5254 {
5255         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5256         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5257
5258         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5259                 return -EINVAL;
5260         if (rcvd->max_resp_sz < sent->max_resp_sz)
5261                 return -EINVAL;
5262         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5263                 return -EINVAL;
5264         /* These would render the backchannel useless: */
5265         if (rcvd->max_ops  == 0)
5266                 return -EINVAL;
5267         if (rcvd->max_reqs == 0)
5268                 return -EINVAL;
5269         return 0;
5270 }
5271
5272 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5273                                      struct nfs4_session *session)
5274 {
5275         int ret;
5276
5277         ret = nfs4_verify_fore_channel_attrs(args, session);
5278         if (ret)
5279                 return ret;
5280         return nfs4_verify_back_channel_attrs(args, session);
5281 }
5282
5283 static int _nfs4_proc_create_session(struct nfs_client *clp)
5284 {
5285         struct nfs4_session *session = clp->cl_session;
5286         struct nfs41_create_session_args args = {
5287                 .client = clp,
5288                 .cb_program = NFS4_CALLBACK,
5289         };
5290         struct nfs41_create_session_res res = {
5291                 .client = clp,
5292         };
5293         struct rpc_message msg = {
5294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5295                 .rpc_argp = &args,
5296                 .rpc_resp = &res,
5297         };
5298         int status;
5299
5300         nfs4_init_channel_attrs(&args);
5301         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5302
5303         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5304
5305         if (!status)
5306                 /* Verify the session's negotiated channel_attrs values */
5307                 status = nfs4_verify_channel_attrs(&args, session);
5308         if (!status) {
5309                 /* Increment the clientid slot sequence id */
5310                 clp->cl_seqid++;
5311         }
5312
5313         return status;
5314 }
5315
5316 /*
5317  * Issues a CREATE_SESSION operation to the server.
5318  * It is the responsibility of the caller to verify the session is
5319  * expired before calling this routine.
5320  */
5321 int nfs4_proc_create_session(struct nfs_client *clp)
5322 {
5323         int status;
5324         unsigned *ptr;
5325         struct nfs4_session *session = clp->cl_session;
5326
5327         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5328
5329         status = _nfs4_proc_create_session(clp);
5330         if (status)
5331                 goto out;
5332
5333         /* Init or reset the session slot tables */
5334         status = nfs4_setup_session_slot_tables(session);
5335         dprintk("slot table setup returned %d\n", status);
5336         if (status)
5337                 goto out;
5338
5339         ptr = (unsigned *)&session->sess_id.data[0];
5340         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5341                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5342 out:
5343         dprintk("<-- %s\n", __func__);
5344         return status;
5345 }
5346
5347 /*
5348  * Issue the over-the-wire RPC DESTROY_SESSION.
5349  * The caller must serialize access to this routine.
5350  */
5351 int nfs4_proc_destroy_session(struct nfs4_session *session)
5352 {
5353         int status = 0;
5354         struct rpc_message msg;
5355
5356         dprintk("--> nfs4_proc_destroy_session\n");
5357
5358         /* session is still being setup */
5359         if (session->clp->cl_cons_state != NFS_CS_READY)
5360                 return status;
5361
5362         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5363         msg.rpc_argp = session;
5364         msg.rpc_resp = NULL;
5365         msg.rpc_cred = NULL;
5366         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5367
5368         if (status)
5369                 printk(KERN_WARNING
5370                         "Got error %d from the server on DESTROY_SESSION. "
5371                         "Session has been destroyed regardless...\n", status);
5372
5373         dprintk("<-- nfs4_proc_destroy_session\n");
5374         return status;
5375 }
5376
5377 int nfs4_init_session(struct nfs_server *server)
5378 {
5379         struct nfs_client *clp = server->nfs_client;
5380         struct nfs4_session *session;
5381         unsigned int rsize, wsize;
5382         int ret;
5383
5384         if (!nfs4_has_session(clp))
5385                 return 0;
5386
5387         session = clp->cl_session;
5388         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5389                 return 0;
5390
5391         rsize = server->rsize;
5392         if (rsize == 0)
5393                 rsize = NFS_MAX_FILE_IO_SIZE;
5394         wsize = server->wsize;
5395         if (wsize == 0)
5396                 wsize = NFS_MAX_FILE_IO_SIZE;
5397
5398         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5399         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5400
5401         ret = nfs4_recover_expired_lease(server);
5402         if (!ret)
5403                 ret = nfs4_check_client_ready(clp);
5404         return ret;
5405 }
5406
5407 int nfs4_init_ds_session(struct nfs_client *clp)
5408 {
5409         struct nfs4_session *session = clp->cl_session;
5410         int ret;
5411
5412         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5413                 return 0;
5414
5415         ret = nfs4_client_recover_expired_lease(clp);
5416         if (!ret)
5417                 /* Test for the DS role */
5418                 if (!is_ds_client(clp))
5419                         ret = -ENODEV;
5420         if (!ret)
5421                 ret = nfs4_check_client_ready(clp);
5422         return ret;
5423
5424 }
5425 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5426
5427
5428 /*
5429  * Renew the cl_session lease.
5430  */
5431 struct nfs4_sequence_data {
5432         struct nfs_client *clp;
5433         struct nfs4_sequence_args args;
5434         struct nfs4_sequence_res res;
5435 };
5436
5437 static void nfs41_sequence_release(void *data)
5438 {
5439         struct nfs4_sequence_data *calldata = data;
5440         struct nfs_client *clp = calldata->clp;
5441
5442         if (atomic_read(&clp->cl_count) > 1)
5443                 nfs4_schedule_state_renewal(clp);
5444         nfs_put_client(clp);
5445         kfree(calldata);
5446 }
5447
5448 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5449 {
5450         switch(task->tk_status) {
5451         case -NFS4ERR_DELAY:
5452                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5453                 return -EAGAIN;
5454         default:
5455                 nfs4_schedule_lease_recovery(clp);
5456         }
5457         return 0;
5458 }
5459
5460 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5461 {
5462         struct nfs4_sequence_data *calldata = data;
5463         struct nfs_client *clp = calldata->clp;
5464
5465         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5466                 return;
5467
5468         if (task->tk_status < 0) {
5469                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5470                 if (atomic_read(&clp->cl_count) == 1)
5471                         goto out;
5472
5473                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5474                         rpc_restart_call_prepare(task);
5475                         return;
5476                 }
5477         }
5478         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5479 out:
5480         dprintk("<-- %s\n", __func__);
5481 }
5482
5483 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5484 {
5485         struct nfs4_sequence_data *calldata = data;
5486         struct nfs_client *clp = calldata->clp;
5487         struct nfs4_sequence_args *args;
5488         struct nfs4_sequence_res *res;
5489
5490         args = task->tk_msg.rpc_argp;
5491         res = task->tk_msg.rpc_resp;
5492
5493         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5494                 return;
5495         rpc_call_start(task);
5496 }
5497
5498 static const struct rpc_call_ops nfs41_sequence_ops = {
5499         .rpc_call_done = nfs41_sequence_call_done,
5500         .rpc_call_prepare = nfs41_sequence_prepare,
5501         .rpc_release = nfs41_sequence_release,
5502 };
5503
5504 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5505 {
5506         struct nfs4_sequence_data *calldata;
5507         struct rpc_message msg = {
5508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5509                 .rpc_cred = cred,
5510         };
5511         struct rpc_task_setup task_setup_data = {
5512                 .rpc_client = clp->cl_rpcclient,
5513                 .rpc_message = &msg,
5514                 .callback_ops = &nfs41_sequence_ops,
5515                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5516         };
5517
5518         if (!atomic_inc_not_zero(&clp->cl_count))
5519                 return ERR_PTR(-EIO);
5520         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5521         if (calldata == NULL) {
5522                 nfs_put_client(clp);
5523                 return ERR_PTR(-ENOMEM);
5524         }
5525         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5526         msg.rpc_argp = &calldata->args;
5527         msg.rpc_resp = &calldata->res;
5528         calldata->clp = clp;
5529         task_setup_data.callback_data = calldata;
5530
5531         return rpc_run_task(&task_setup_data);
5532 }
5533
5534 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5535 {
5536         struct rpc_task *task;
5537         int ret = 0;
5538
5539         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5540                 return 0;
5541         task = _nfs41_proc_sequence(clp, cred);
5542         if (IS_ERR(task))
5543                 ret = PTR_ERR(task);
5544         else
5545                 rpc_put_task_async(task);
5546         dprintk("<-- %s status=%d\n", __func__, ret);
5547         return ret;
5548 }
5549
5550 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5551 {
5552         struct rpc_task *task;
5553         int ret;
5554
5555         task = _nfs41_proc_sequence(clp, cred);
5556         if (IS_ERR(task)) {
5557                 ret = PTR_ERR(task);
5558                 goto out;
5559         }
5560         ret = rpc_wait_for_completion_task(task);
5561         if (!ret) {
5562                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5563
5564                 if (task->tk_status == 0)
5565                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5566                 ret = task->tk_status;
5567         }
5568         rpc_put_task(task);
5569 out:
5570         dprintk("<-- %s status=%d\n", __func__, ret);
5571         return ret;
5572 }
5573
5574 struct nfs4_reclaim_complete_data {
5575         struct nfs_client *clp;
5576         struct nfs41_reclaim_complete_args arg;
5577         struct nfs41_reclaim_complete_res res;
5578 };
5579
5580 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5581 {
5582         struct nfs4_reclaim_complete_data *calldata = data;
5583
5584         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5585         if (nfs41_setup_sequence(calldata->clp->cl_session,
5586                                 &calldata->arg.seq_args,
5587                                 &calldata->res.seq_res, task))
5588                 return;
5589
5590         rpc_call_start(task);
5591 }
5592
5593 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5594 {
5595         switch(task->tk_status) {
5596         case 0:
5597         case -NFS4ERR_COMPLETE_ALREADY:
5598         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5599                 break;
5600         case -NFS4ERR_DELAY:
5601                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5602                 /* fall through */
5603         case -NFS4ERR_RETRY_UNCACHED_REP:
5604                 return -EAGAIN;
5605         default:
5606                 nfs4_schedule_lease_recovery(clp);
5607         }
5608         return 0;
5609 }
5610
5611 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5612 {
5613         struct nfs4_reclaim_complete_data *calldata = data;
5614         struct nfs_client *clp = calldata->clp;
5615         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5616
5617         dprintk("--> %s\n", __func__);
5618         if (!nfs41_sequence_done(task, res))
5619                 return;
5620
5621         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5622                 rpc_restart_call_prepare(task);
5623                 return;
5624         }
5625         dprintk("<-- %s\n", __func__);
5626 }
5627
5628 static void nfs4_free_reclaim_complete_data(void *data)
5629 {
5630         struct nfs4_reclaim_complete_data *calldata = data;
5631
5632         kfree(calldata);
5633 }
5634
5635 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5636         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5637         .rpc_call_done = nfs4_reclaim_complete_done,
5638         .rpc_release = nfs4_free_reclaim_complete_data,
5639 };
5640
5641 /*
5642  * Issue a global reclaim complete.
5643  */
5644 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5645 {
5646         struct nfs4_reclaim_complete_data *calldata;
5647         struct rpc_task *task;
5648         struct rpc_message msg = {
5649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5650         };
5651         struct rpc_task_setup task_setup_data = {
5652                 .rpc_client = clp->cl_rpcclient,
5653                 .rpc_message = &msg,
5654                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5655                 .flags = RPC_TASK_ASYNC,
5656         };
5657         int status = -ENOMEM;
5658
5659         dprintk("--> %s\n", __func__);
5660         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5661         if (calldata == NULL)
5662                 goto out;
5663         calldata->clp = clp;
5664         calldata->arg.one_fs = 0;
5665
5666         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5667         msg.rpc_argp = &calldata->arg;
5668         msg.rpc_resp = &calldata->res;
5669         task_setup_data.callback_data = calldata;
5670         task = rpc_run_task(&task_setup_data);
5671         if (IS_ERR(task)) {
5672                 status = PTR_ERR(task);
5673                 goto out;
5674         }
5675         status = nfs4_wait_for_completion_rpc_task(task);
5676         if (status == 0)
5677                 status = task->tk_status;
5678         rpc_put_task(task);
5679         return 0;
5680 out:
5681         dprintk("<-- %s status=%d\n", __func__, status);
5682         return status;
5683 }
5684
5685 static void
5686 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5687 {
5688         struct nfs4_layoutget *lgp = calldata;
5689         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5690
5691         dprintk("--> %s\n", __func__);
5692         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5693          * right now covering the LAYOUTGET we are about to send.
5694          * However, that is not so catastrophic, and there seems
5695          * to be no way to prevent it completely.
5696          */
5697         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5698                                 &lgp->res.seq_res, task))
5699                 return;
5700         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5701                                           NFS_I(lgp->args.inode)->layout,
5702                                           lgp->args.ctx->state)) {
5703                 rpc_exit(task, NFS4_OK);
5704                 return;
5705         }
5706         rpc_call_start(task);
5707 }
5708
5709 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5710 {
5711         struct nfs4_layoutget *lgp = calldata;
5712         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5713
5714         dprintk("--> %s\n", __func__);
5715
5716         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5717                 return;
5718
5719         switch (task->tk_status) {
5720         case 0:
5721                 break;
5722         case -NFS4ERR_LAYOUTTRYLATER:
5723         case -NFS4ERR_RECALLCONFLICT:
5724                 task->tk_status = -NFS4ERR_DELAY;
5725                 /* Fall through */
5726         default:
5727                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5728                         rpc_restart_call_prepare(task);
5729                         return;
5730                 }
5731         }
5732         dprintk("<-- %s\n", __func__);
5733 }
5734
5735 static void nfs4_layoutget_release(void *calldata)
5736 {
5737         struct nfs4_layoutget *lgp = calldata;
5738
5739         dprintk("--> %s\n", __func__);
5740         put_nfs_open_context(lgp->args.ctx);
5741         kfree(calldata);
5742         dprintk("<-- %s\n", __func__);
5743 }
5744
5745 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5746         .rpc_call_prepare = nfs4_layoutget_prepare,
5747         .rpc_call_done = nfs4_layoutget_done,
5748         .rpc_release = nfs4_layoutget_release,
5749 };
5750
5751 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5752 {
5753         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5754         struct rpc_task *task;
5755         struct rpc_message msg = {
5756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5757                 .rpc_argp = &lgp->args,
5758                 .rpc_resp = &lgp->res,
5759         };
5760         struct rpc_task_setup task_setup_data = {
5761                 .rpc_client = server->client,
5762                 .rpc_message = &msg,
5763                 .callback_ops = &nfs4_layoutget_call_ops,
5764                 .callback_data = lgp,
5765                 .flags = RPC_TASK_ASYNC,
5766         };
5767         int status = 0;
5768
5769         dprintk("--> %s\n", __func__);
5770
5771         lgp->res.layoutp = &lgp->args.layout;
5772         lgp->res.seq_res.sr_slot = NULL;
5773         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5774         task = rpc_run_task(&task_setup_data);
5775         if (IS_ERR(task))
5776                 return PTR_ERR(task);
5777         status = nfs4_wait_for_completion_rpc_task(task);
5778         if (status == 0)
5779                 status = task->tk_status;
5780         if (status == 0)
5781                 status = pnfs_layout_process(lgp);
5782         rpc_put_task(task);
5783         dprintk("<-- %s status=%d\n", __func__, status);
5784         return status;
5785 }
5786
5787 static void
5788 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5789 {
5790         struct nfs4_layoutreturn *lrp = calldata;
5791
5792         dprintk("--> %s\n", __func__);
5793         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5794                                 &lrp->res.seq_res, task))
5795                 return;
5796         rpc_call_start(task);
5797 }
5798
5799 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5800 {
5801         struct nfs4_layoutreturn *lrp = calldata;
5802         struct nfs_server *server;
5803         struct pnfs_layout_hdr *lo = lrp->args.layout;
5804
5805         dprintk("--> %s\n", __func__);
5806
5807         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5808                 return;
5809
5810         server = NFS_SERVER(lrp->args.inode);
5811         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5812                 rpc_restart_call_prepare(task);
5813                 return;
5814         }
5815         spin_lock(&lo->plh_inode->i_lock);
5816         if (task->tk_status == 0) {
5817                 if (lrp->res.lrs_present) {
5818                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5819                 } else
5820                         BUG_ON(!list_empty(&lo->plh_segs));
5821         }
5822         lo->plh_block_lgets--;
5823         spin_unlock(&lo->plh_inode->i_lock);
5824         dprintk("<-- %s\n", __func__);
5825 }
5826
5827 static void nfs4_layoutreturn_release(void *calldata)
5828 {
5829         struct nfs4_layoutreturn *lrp = calldata;
5830
5831         dprintk("--> %s\n", __func__);
5832         put_layout_hdr(lrp->args.layout);
5833         kfree(calldata);
5834         dprintk("<-- %s\n", __func__);
5835 }
5836
5837 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5838         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5839         .rpc_call_done = nfs4_layoutreturn_done,
5840         .rpc_release = nfs4_layoutreturn_release,
5841 };
5842
5843 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5844 {
5845         struct rpc_task *task;
5846         struct rpc_message msg = {
5847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5848                 .rpc_argp = &lrp->args,
5849                 .rpc_resp = &lrp->res,
5850         };
5851         struct rpc_task_setup task_setup_data = {
5852                 .rpc_client = lrp->clp->cl_rpcclient,
5853                 .rpc_message = &msg,
5854                 .callback_ops = &nfs4_layoutreturn_call_ops,
5855                 .callback_data = lrp,
5856         };
5857         int status;
5858
5859         dprintk("--> %s\n", __func__);
5860         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
5861         task = rpc_run_task(&task_setup_data);
5862         if (IS_ERR(task))
5863                 return PTR_ERR(task);
5864         status = task->tk_status;
5865         dprintk("<-- %s status=%d\n", __func__, status);
5866         rpc_put_task(task);
5867         return status;
5868 }
5869
5870 /*
5871  * Retrieve the list of Data Server devices from the MDS.
5872  */
5873 static int _nfs4_getdevicelist(struct nfs_server *server,
5874                                     const struct nfs_fh *fh,
5875                                     struct pnfs_devicelist *devlist)
5876 {
5877         struct nfs4_getdevicelist_args args = {
5878                 .fh = fh,
5879                 .layoutclass = server->pnfs_curr_ld->id,
5880         };
5881         struct nfs4_getdevicelist_res res = {
5882                 .devlist = devlist,
5883         };
5884         struct rpc_message msg = {
5885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5886                 .rpc_argp = &args,
5887                 .rpc_resp = &res,
5888         };
5889         int status;
5890
5891         dprintk("--> %s\n", __func__);
5892         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5893                                 &res.seq_res, 0);
5894         dprintk("<-- %s status=%d\n", __func__, status);
5895         return status;
5896 }
5897
5898 int nfs4_proc_getdevicelist(struct nfs_server *server,
5899                             const struct nfs_fh *fh,
5900                             struct pnfs_devicelist *devlist)
5901 {
5902         struct nfs4_exception exception = { };
5903         int err;
5904
5905         do {
5906                 err = nfs4_handle_exception(server,
5907                                 _nfs4_getdevicelist(server, fh, devlist),
5908                                 &exception);
5909         } while (exception.retry);
5910
5911         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5912                 err, devlist->num_devs);
5913
5914         return err;
5915 }
5916 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5917
5918 static int
5919 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5920 {
5921         struct nfs4_getdeviceinfo_args args = {
5922                 .pdev = pdev,
5923         };
5924         struct nfs4_getdeviceinfo_res res = {
5925                 .pdev = pdev,
5926         };
5927         struct rpc_message msg = {
5928                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5929                 .rpc_argp = &args,
5930                 .rpc_resp = &res,
5931         };
5932         int status;
5933
5934         dprintk("--> %s\n", __func__);
5935         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5936         dprintk("<-- %s status=%d\n", __func__, status);
5937
5938         return status;
5939 }
5940
5941 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5942 {
5943         struct nfs4_exception exception = { };
5944         int err;
5945
5946         do {
5947                 err = nfs4_handle_exception(server,
5948                                         _nfs4_proc_getdeviceinfo(server, pdev),
5949                                         &exception);
5950         } while (exception.retry);
5951         return err;
5952 }
5953 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5954
5955 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5956 {
5957         struct nfs4_layoutcommit_data *data = calldata;
5958         struct nfs_server *server = NFS_SERVER(data->args.inode);
5959
5960         if (nfs4_setup_sequence(server, &data->args.seq_args,
5961                                 &data->res.seq_res, task))
5962                 return;
5963         rpc_call_start(task);
5964 }
5965
5966 static void
5967 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5968 {
5969         struct nfs4_layoutcommit_data *data = calldata;
5970         struct nfs_server *server = NFS_SERVER(data->args.inode);
5971
5972         if (!nfs4_sequence_done(task, &data->res.seq_res))
5973                 return;
5974
5975         switch (task->tk_status) { /* Just ignore these failures */
5976         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5977         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5978         case NFS4ERR_BADLAYOUT:     /* no layout */
5979         case NFS4ERR_GRACE:         /* loca_recalim always false */
5980                 task->tk_status = 0;
5981         }
5982
5983         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5984                 rpc_restart_call_prepare(task);
5985                 return;
5986         }
5987
5988         if (task->tk_status == 0)
5989                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5990                                                    data->res.fattr);
5991 }
5992
5993 static void nfs4_layoutcommit_release(void *calldata)
5994 {
5995         struct nfs4_layoutcommit_data *data = calldata;
5996         struct pnfs_layout_segment *lseg, *tmp;
5997         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5998
5999         pnfs_cleanup_layoutcommit(data);
6000         /* Matched by references in pnfs_set_layoutcommit */
6001         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6002                 list_del_init(&lseg->pls_lc_list);
6003                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6004                                        &lseg->pls_flags))
6005                         put_lseg(lseg);
6006         }
6007
6008         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6009         smp_mb__after_clear_bit();
6010         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6011
6012         put_rpccred(data->cred);
6013         kfree(data);
6014 }
6015
6016 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6017         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6018         .rpc_call_done = nfs4_layoutcommit_done,
6019         .rpc_release = nfs4_layoutcommit_release,
6020 };
6021
6022 int
6023 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6024 {
6025         struct rpc_message msg = {
6026                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6027                 .rpc_argp = &data->args,
6028                 .rpc_resp = &data->res,
6029                 .rpc_cred = data->cred,
6030         };
6031         struct rpc_task_setup task_setup_data = {
6032                 .task = &data->task,
6033                 .rpc_client = NFS_CLIENT(data->args.inode),
6034                 .rpc_message = &msg,
6035                 .callback_ops = &nfs4_layoutcommit_ops,
6036                 .callback_data = data,
6037                 .flags = RPC_TASK_ASYNC,
6038         };
6039         struct rpc_task *task;
6040         int status = 0;
6041
6042         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6043                 "lbw: %llu inode %lu\n",
6044                 data->task.tk_pid, sync,
6045                 data->args.lastbytewritten,
6046                 data->args.inode->i_ino);
6047
6048         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6049         task = rpc_run_task(&task_setup_data);
6050         if (IS_ERR(task))
6051                 return PTR_ERR(task);
6052         if (sync == false)
6053                 goto out;
6054         status = nfs4_wait_for_completion_rpc_task(task);
6055         if (status != 0)
6056                 goto out;
6057         status = task->tk_status;
6058 out:
6059         dprintk("%s: status %d\n", __func__, status);
6060         rpc_put_task(task);
6061         return status;
6062 }
6063
6064 static int
6065 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6066                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6067 {
6068         struct nfs41_secinfo_no_name_args args = {
6069                 .style = SECINFO_STYLE_CURRENT_FH,
6070         };
6071         struct nfs4_secinfo_res res = {
6072                 .flavors = flavors,
6073         };
6074         struct rpc_message msg = {
6075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6076                 .rpc_argp = &args,
6077                 .rpc_resp = &res,
6078         };
6079         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6080 }
6081
6082 static int
6083 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6084                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6085 {
6086         struct nfs4_exception exception = { };
6087         int err;
6088         do {
6089                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6090                 switch (err) {
6091                 case 0:
6092                 case -NFS4ERR_WRONGSEC:
6093                 case -NFS4ERR_NOTSUPP:
6094                         break;
6095                 default:
6096                         err = nfs4_handle_exception(server, err, &exception);
6097                 }
6098         } while (exception.retry);
6099         return err;
6100 }
6101
6102 static int
6103 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6104                     struct nfs_fsinfo *info)
6105 {
6106         int err;
6107         struct page *page;
6108         rpc_authflavor_t flavor;
6109         struct nfs4_secinfo_flavors *flavors;
6110
6111         page = alloc_page(GFP_KERNEL);
6112         if (!page) {
6113                 err = -ENOMEM;
6114                 goto out;
6115         }
6116
6117         flavors = page_address(page);
6118         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6119
6120         /*
6121          * Fall back on "guess and check" method if
6122          * the server doesn't support SECINFO_NO_NAME
6123          */
6124         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6125                 err = nfs4_find_root_sec(server, fhandle, info);
6126                 goto out_freepage;
6127         }
6128         if (err)
6129                 goto out_freepage;
6130
6131         flavor = nfs_find_best_sec(flavors);
6132         if (err == 0)
6133                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6134
6135 out_freepage:
6136         put_page(page);
6137         if (err == -EACCES)
6138                 return -EPERM;
6139 out:
6140         return err;
6141 }
6142 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6143 {
6144         struct nfs41_test_stateid_args args = {
6145                 .stateid = &state->stateid,
6146         };
6147         struct nfs41_test_stateid_res res;
6148         struct rpc_message msg = {
6149                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6150                 .rpc_argp = &args,
6151                 .rpc_resp = &res,
6152         };
6153         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6154         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6155 }
6156
6157 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6158 {
6159         struct nfs4_exception exception = { };
6160         int err;
6161         do {
6162                 err = nfs4_handle_exception(server,
6163                                 _nfs41_test_stateid(server, state),
6164                                 &exception);
6165         } while (exception.retry);
6166         return err;
6167 }
6168
6169 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6170 {
6171         struct nfs41_free_stateid_args args = {
6172                 .stateid = &state->stateid,
6173         };
6174         struct nfs41_free_stateid_res res;
6175         struct rpc_message msg = {
6176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6177                 .rpc_argp = &args,
6178                 .rpc_resp = &res,
6179         };
6180
6181         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6182         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6183 }
6184
6185 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6186 {
6187         struct nfs4_exception exception = { };
6188         int err;
6189         do {
6190                 err = nfs4_handle_exception(server,
6191                                 _nfs4_free_stateid(server, state),
6192                                 &exception);
6193         } while (exception.retry);
6194         return err;
6195 }
6196 #endif /* CONFIG_NFS_V4_1 */
6197
6198 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6199         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6200         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6201         .recover_open   = nfs4_open_reclaim,
6202         .recover_lock   = nfs4_lock_reclaim,
6203         .establish_clid = nfs4_init_clientid,
6204         .get_clid_cred  = nfs4_get_setclientid_cred,
6205 };
6206
6207 #if defined(CONFIG_NFS_V4_1)
6208 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6209         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6210         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6211         .recover_open   = nfs4_open_reclaim,
6212         .recover_lock   = nfs4_lock_reclaim,
6213         .establish_clid = nfs41_init_clientid,
6214         .get_clid_cred  = nfs4_get_exchange_id_cred,
6215         .reclaim_complete = nfs41_proc_reclaim_complete,
6216 };
6217 #endif /* CONFIG_NFS_V4_1 */
6218
6219 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6220         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6221         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6222         .recover_open   = nfs4_open_expired,
6223         .recover_lock   = nfs4_lock_expired,
6224         .establish_clid = nfs4_init_clientid,
6225         .get_clid_cred  = nfs4_get_setclientid_cred,
6226 };
6227
6228 #if defined(CONFIG_NFS_V4_1)
6229 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6230         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6231         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6232         .recover_open   = nfs41_open_expired,
6233         .recover_lock   = nfs41_lock_expired,
6234         .establish_clid = nfs41_init_clientid,
6235         .get_clid_cred  = nfs4_get_exchange_id_cred,
6236 };
6237 #endif /* CONFIG_NFS_V4_1 */
6238
6239 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6240         .sched_state_renewal = nfs4_proc_async_renew,
6241         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6242         .renew_lease = nfs4_proc_renew,
6243 };
6244
6245 #if defined(CONFIG_NFS_V4_1)
6246 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6247         .sched_state_renewal = nfs41_proc_async_sequence,
6248         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6249         .renew_lease = nfs4_proc_sequence,
6250 };
6251 #endif
6252
6253 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6254         .minor_version = 0,
6255         .call_sync = _nfs4_call_sync,
6256         .validate_stateid = nfs4_validate_delegation_stateid,
6257         .find_root_sec = nfs4_find_root_sec,
6258         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6259         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6260         .state_renewal_ops = &nfs40_state_renewal_ops,
6261 };
6262
6263 #if defined(CONFIG_NFS_V4_1)
6264 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6265         .minor_version = 1,
6266         .call_sync = _nfs4_call_sync_session,
6267         .validate_stateid = nfs41_validate_delegation_stateid,
6268         .find_root_sec = nfs41_find_root_sec,
6269         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6270         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6271         .state_renewal_ops = &nfs41_state_renewal_ops,
6272 };
6273 #endif
6274
6275 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6276         [0] = &nfs_v4_0_minor_ops,
6277 #if defined(CONFIG_NFS_V4_1)
6278         [1] = &nfs_v4_1_minor_ops,
6279 #endif
6280 };
6281
6282 static const struct inode_operations nfs4_file_inode_operations = {
6283         .permission     = nfs_permission,
6284         .getattr        = nfs_getattr,
6285         .setattr        = nfs_setattr,
6286         .getxattr       = generic_getxattr,
6287         .setxattr       = generic_setxattr,
6288         .listxattr      = generic_listxattr,
6289         .removexattr    = generic_removexattr,
6290 };
6291
6292 const struct nfs_rpc_ops nfs_v4_clientops = {
6293         .version        = 4,                    /* protocol version */
6294         .dentry_ops     = &nfs4_dentry_operations,
6295         .dir_inode_ops  = &nfs4_dir_inode_operations,
6296         .file_inode_ops = &nfs4_file_inode_operations,
6297         .file_ops       = &nfs4_file_operations,
6298         .getroot        = nfs4_proc_get_root,
6299         .getattr        = nfs4_proc_getattr,
6300         .setattr        = nfs4_proc_setattr,
6301         .lookup         = nfs4_proc_lookup,
6302         .access         = nfs4_proc_access,
6303         .readlink       = nfs4_proc_readlink,
6304         .create         = nfs4_proc_create,
6305         .remove         = nfs4_proc_remove,
6306         .unlink_setup   = nfs4_proc_unlink_setup,
6307         .unlink_done    = nfs4_proc_unlink_done,
6308         .rename         = nfs4_proc_rename,
6309         .rename_setup   = nfs4_proc_rename_setup,
6310         .rename_done    = nfs4_proc_rename_done,
6311         .link           = nfs4_proc_link,
6312         .symlink        = nfs4_proc_symlink,
6313         .mkdir          = nfs4_proc_mkdir,
6314         .rmdir          = nfs4_proc_remove,
6315         .readdir        = nfs4_proc_readdir,
6316         .mknod          = nfs4_proc_mknod,
6317         .statfs         = nfs4_proc_statfs,
6318         .fsinfo         = nfs4_proc_fsinfo,
6319         .pathconf       = nfs4_proc_pathconf,
6320         .set_capabilities = nfs4_server_capabilities,
6321         .decode_dirent  = nfs4_decode_dirent,
6322         .read_setup     = nfs4_proc_read_setup,
6323         .read_done      = nfs4_read_done,
6324         .write_setup    = nfs4_proc_write_setup,
6325         .write_done     = nfs4_write_done,
6326         .commit_setup   = nfs4_proc_commit_setup,
6327         .commit_done    = nfs4_commit_done,
6328         .lock           = nfs4_proc_lock,
6329         .clear_acl_cache = nfs4_zap_acl_attr,
6330         .close_context  = nfs4_close_context,
6331         .open_context   = nfs4_atomic_open,
6332         .init_client    = nfs4_init_client,
6333         .secinfo        = nfs4_proc_secinfo,
6334 };
6335
6336 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6337         .prefix = XATTR_NAME_NFSV4_ACL,
6338         .list   = nfs4_xattr_list_nfs4_acl,
6339         .get    = nfs4_xattr_get_nfs4_acl,
6340         .set    = nfs4_xattr_set_nfs4_acl,
6341 };
6342
6343 const struct xattr_handler *nfs4_xattr_handlers[] = {
6344         &nfs4_xattr_nfs4_acl_handler,
6345         NULL
6346 };
6347
6348 /*
6349  * Local variables:
6350  *  c-basic-offset: 8
6351  * End:
6352  */