fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83 #ifdef CONFIG_NFS_V4_1
  84 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  85 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  86 #endif
  87 /* Prevent leaks of NFSv4 errors into userland */
  88 static int nfs4_map_errors(int err)
  89 {
  90         if (err >= -1000)
  91                 return err;
  92         switch (err) {
  93         case -NFS4ERR_RESOURCE:
  94                 return -EREMOTEIO;
  95         case -NFS4ERR_WRONGSEC:
  96                 return -EPERM;
  97         case -NFS4ERR_BADOWNER:
  98         case -NFS4ERR_BADNAME:
  99                 return -EINVAL;
 100         default:
 101                 dprintk("%s could not handle NFSv4 error %d\n",
 102                                 __func__, -err);
 103                 break;
 104         }
 105         return -EIO;
 106 }
 107
 108 /*
 109  * This is our standard bitmap for GETATTR requests.
 110  */
 111 const u32 nfs4_fattr_bitmap[2] = {
 112         FATTR4_WORD0_TYPE
 113         | FATTR4_WORD0_CHANGE
 114         | FATTR4_WORD0_SIZE
 115         | FATTR4_WORD0_FSID
 116         | FATTR4_WORD0_FILEID,
 117         FATTR4_WORD1_MODE
 118         | FATTR4_WORD1_NUMLINKS
 119         | FATTR4_WORD1_OWNER
 120         | FATTR4_WORD1_OWNER_GROUP
 121         | FATTR4_WORD1_RAWDEV
 122         | FATTR4_WORD1_SPACE_USED
 123         | FATTR4_WORD1_TIME_ACCESS
 124         | FATTR4_WORD1_TIME_METADATA
 125         | FATTR4_WORD1_TIME_MODIFY
 126 };
 127
 128 const u32 nfs4_statfs_bitmap[2] = {
 129         FATTR4_WORD0_FILES_AVAIL
 130         | FATTR4_WORD0_FILES_FREE
 131         | FATTR4_WORD0_FILES_TOTAL,
 132         FATTR4_WORD1_SPACE_AVAIL
 133         | FATTR4_WORD1_SPACE_FREE
 134         | FATTR4_WORD1_SPACE_TOTAL
 135 };
 136
 137 const u32 nfs4_pathconf_bitmap[2] = {
 138         FATTR4_WORD0_MAXLINK
 139         | FATTR4_WORD0_MAXNAME,
 140         0
 141 };
 142
 143 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 144                         | FATTR4_WORD0_MAXREAD
 145                         | FATTR4_WORD0_MAXWRITE
 146                         | FATTR4_WORD0_LEASE_TIME,
 147                         FATTR4_WORD1_TIME_DELTA
 148                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 149                         FATTR4_WORD2_LAYOUT_BLKSIZE
 150 };
 151
 152 const u32 nfs4_fs_locations_bitmap[2] = {
 153         FATTR4_WORD0_TYPE
 154         | FATTR4_WORD0_CHANGE
 155         | FATTR4_WORD0_SIZE
 156         | FATTR4_WORD0_FSID
 157         | FATTR4_WORD0_FILEID
 158         | FATTR4_WORD0_FS_LOCATIONS,
 159         FATTR4_WORD1_MODE
 160         | FATTR4_WORD1_NUMLINKS
 161         | FATTR4_WORD1_OWNER
 162         | FATTR4_WORD1_OWNER_GROUP
 163         | FATTR4_WORD1_RAWDEV
 164         | FATTR4_WORD1_SPACE_USED
 165         | FATTR4_WORD1_TIME_ACCESS
 166         | FATTR4_WORD1_TIME_METADATA
 167         | FATTR4_WORD1_TIME_MODIFY
 168         | FATTR4_WORD1_MOUNTED_ON_FILEID
 169 };
 170
 171 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 172                 struct nfs4_readdir_arg *readdir)
 173 {
 174         __be32 *start, *p;
 175
 176         BUG_ON(readdir->count < 80);
 177         if (cookie > 2) {
 178                 readdir->cookie = cookie;
 179                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 180                 return;
 181         }
 182
 183         readdir->cookie = 0;
 184         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 185         if (cookie == 2)
 186                 return;
 187
 188         /*
 189          * NFSv4 servers do not return entries for '.' and '..'
 190          * Therefore, we fake these entries here.  We let '.'
 191          * have cookie 0 and '..' have cookie 1.  Note that
 192          * when talking to the server, we always send cookie 0
 193          * instead of 1 or 2.
 194          */
 195         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 196
 197         if (cookie == 0) {
 198                 *p++ = xdr_one;                                  /* next */
 199                 *p++ = xdr_zero;                   /* cookie, first word */
 200                 *p++ = xdr_one;                   /* cookie, second word */
 201                 *p++ = xdr_one;                             /* entry len */
 202                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 203                 p++;
 204                 *p++ = xdr_one;                         /* bitmap length */
 205                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 206                 *p++ = htonl(8);              /* attribute buffer length */
 207                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 208         }
 209
 210         *p++ = xdr_one;                                  /* next */
 211         *p++ = xdr_zero;                   /* cookie, first word */
 212         *p++ = xdr_two;                   /* cookie, second word */
 213         *p++ = xdr_two;                             /* entry len */
 214         memcpy(p, "..\0\0", 4);                         /* entry */
 215         p++;
 216         *p++ = xdr_one;                         /* bitmap length */
 217         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 218         *p++ = htonl(8);              /* attribute buffer length */
 219         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 220
 221         readdir->pgbase = (char *)p - (char *)start;
 222         readdir->count -= readdir->pgbase;
 223         kunmap_atomic(start, KM_USER0);
 224 }
 225
 226 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 227 {
 228         int res;
 229
 230         might_sleep();
 231
 232         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 233                         nfs_wait_bit_killable, TASK_KILLABLE);
 234         return res;
 235 }
 236
 237 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 238 {
 239         int res = 0;
 240
 241         might_sleep();
 242
 243         if (*timeout <= 0)
 244                 *timeout = NFS4_POLL_RETRY_MIN;
 245         if (*timeout > NFS4_POLL_RETRY_MAX)
 246                 *timeout = NFS4_POLL_RETRY_MAX;
 247         schedule_timeout_killable(*timeout);
 248         if (fatal_signal_pending(current))
 249                 res = -ERESTARTSYS;
 250         *timeout <<= 1;
 251         return res;
 252 }
 253
 254 /* This is the error handling routine for processes that are allowed
 255  * to sleep.
 256  */
 257 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 258 {
 259         struct nfs_client *clp = server->nfs_client;
 260         struct nfs4_state *state = exception->state;
 261         int ret = errorcode;
 262
 263         exception->retry = 0;
 264         switch(errorcode) {
 265                 case 0:
 266                         return 0;
 267                 case -NFS4ERR_ADMIN_REVOKED:
 268                 case -NFS4ERR_BAD_STATEID:
 269                 case -NFS4ERR_OPENMODE:
 270                         if (state == NULL)
 271                                 break;
 272                         nfs4_schedule_stateid_recovery(server, state);
 273                         goto wait_on_recovery;
 274                 case -NFS4ERR_EXPIRED:
 275                         if (state != NULL)
 276                                 nfs4_schedule_stateid_recovery(server, state);
 277                 case -NFS4ERR_STALE_STATEID:
 278                 case -NFS4ERR_STALE_CLIENTID:
 279                         nfs4_schedule_lease_recovery(clp);
 280                         goto wait_on_recovery;
 281 #if defined(CONFIG_NFS_V4_1)
 282                 case -NFS4ERR_BADSESSION:
 283                 case -NFS4ERR_BADSLOT:
 284                 case -NFS4ERR_BAD_HIGH_SLOT:
 285                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 286                 case -NFS4ERR_DEADSESSION:
 287                 case -NFS4ERR_SEQ_FALSE_RETRY:
 288                 case -NFS4ERR_SEQ_MISORDERED:
 289                         dprintk("%s ERROR: %d Reset session\n", __func__,
 290                                 errorcode);
 291                         nfs4_schedule_session_recovery(clp->cl_session);
 292                         exception->retry = 1;
 293                         break;
 294 #endif /* defined(CONFIG_NFS_V4_1) */
 295                 case -NFS4ERR_FILE_OPEN:
 296                         if (exception->timeout > HZ) {
 297                                 /* We have retried a decent amount, time to
 298                                  * fail
 299                                  */
 300                                 ret = -EBUSY;
 301                                 break;
 302                         }
 303                 case -NFS4ERR_GRACE:
 304                 case -NFS4ERR_DELAY:
 305                 case -EKEYEXPIRED:
 306                         ret = nfs4_delay(server->client, &exception->timeout);
 307                         if (ret != 0)
 308                                 break;
 309                 case -NFS4ERR_RETRY_UNCACHED_REP:
 310                 case -NFS4ERR_OLD_STATEID:
 311                         exception->retry = 1;
 312                         break;
 313                 case -NFS4ERR_BADOWNER:
 314                         /* The following works around a Linux server bug! */
 315                 case -NFS4ERR_BADNAME:
 316                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 317                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 318                                 exception->retry = 1;
 319                                 printk(KERN_WARNING "NFS: v4 server %s "
 320                                                 "does not accept raw "
 321                                                 "uid/gids. "
 322                                                 "Reenabling the idmapper.\n",
 323                                                 server->nfs_client->cl_hostname);
 324                         }
 325         }
 326         /* We failed to handle the error */
 327         return nfs4_map_errors(ret);
 328 wait_on_recovery:
 329         ret = nfs4_wait_clnt_recover(clp);
 330         if (ret == 0)
 331                 exception->retry = 1;
 332         return ret;
 333 }
 334
 335
 336 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 337 {
 338         spin_lock(&clp->cl_lock);
 339         if (time_before(clp->cl_last_renewal,timestamp))
 340                 clp->cl_last_renewal = timestamp;
 341         spin_unlock(&clp->cl_lock);
 342 }
 343
 344 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 345 {
 346         do_renew_lease(server->nfs_client, timestamp);
 347 }
 348
 349 #if defined(CONFIG_NFS_V4_1)
 350
 351 /*
 352  * nfs4_free_slot - free a slot and efficiently update slot table.
 353  *
 354  * freeing a slot is trivially done by clearing its respective bit
 355  * in the bitmap.
 356  * If the freed slotid equals highest_used_slotid we want to update it
 357  * so that the server would be able to size down the slot table if needed,
 358  * otherwise we know that the highest_used_slotid is still in use.
 359  * When updating highest_used_slotid there may be "holes" in the bitmap
 360  * so we need to scan down from highest_used_slotid to 0 looking for the now
 361  * highest slotid in use.
 362  * If none found, highest_used_slotid is set to -1.
 363  *
 364  * Must be called while holding tbl->slot_tbl_lock
 365  */
 366 static void
 367 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 368 {
 369         int free_slotid = free_slot - tbl->slots;
 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);
 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 int nfs41_setup_sequence(struct nfs4_session *session,
 538                                 struct nfs4_sequence_args *args,
 539                                 struct nfs4_sequence_res *res,
 540                                 int cache_reply,
 541                                 struct rpc_task *task)
 542 {
 543         struct nfs4_slot *slot;
 544         struct nfs4_slot_table *tbl;
 545         u8 slotid;
 546
 547         dprintk("--> %s\n", __func__);
 548         /* slot already allocated? */
 549         if (res->sr_slot != NULL)
 550                 return 0;
 551
 552         tbl = &session->fc_slot_table;
 553
 554         spin_lock(&tbl->slot_tbl_lock);
 555         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 556             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 557                 /*
 558                  * The state manager will wait until the slot table is empty.
 559                  * Schedule the reset thread
 560                  */
 561                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 562                 spin_unlock(&tbl->slot_tbl_lock);
 563                 dprintk("%s Schedule Session Reset\n", __func__);
 564                 return -EAGAIN;
 565         }
 566
 567         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 568             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 569                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 570                 spin_unlock(&tbl->slot_tbl_lock);
 571                 dprintk("%s enforce FIFO order\n", __func__);
 572                 return -EAGAIN;
 573         }
 574
 575         slotid = nfs4_find_slot(tbl);
 576         if (slotid == NFS4_MAX_SLOT_TABLE) {
 577                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 578                 spin_unlock(&tbl->slot_tbl_lock);
 579                 dprintk("<-- %s: no free slots\n", __func__);
 580                 return -EAGAIN;
 581         }
 582         spin_unlock(&tbl->slot_tbl_lock);
 583
 584         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 585         slot = tbl->slots + slotid;
 586         args->sa_session = session;
 587         args->sa_slotid = slotid;
 588         args->sa_cache_this = cache_reply;
 589
 590         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 591
 592         res->sr_session = session;
 593         res->sr_slot = slot;
 594         res->sr_renewal_time = jiffies;
 595         res->sr_status_flags = 0;
 596         /*
 597          * sr_status is only set in decode_sequence, and so will remain
 598          * set to 1 if an rpc level failure occurs.
 599          */
 600         res->sr_status = 1;
 601         return 0;
 602 }
 603 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 604
 605 int nfs4_setup_sequence(const struct nfs_server *server,
 606                         struct nfs4_sequence_args *args,
 607                         struct nfs4_sequence_res *res,
 608                         int cache_reply,
 609                         struct rpc_task *task)
 610 {
 611         struct nfs4_session *session = nfs4_get_session(server);
 612         int ret = 0;
 613
 614         if (session == NULL) {
 615                 args->sa_session = NULL;
 616                 res->sr_session = NULL;
 617                 goto out;
 618         }
 619
 620         dprintk("--> %s clp %p session %p sr_slot %td\n",
 621                 __func__, session->clp, session, res->sr_slot ?
 622                         res->sr_slot - session->fc_slot_table.slots : -1);
 623
 624         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 625                                    task);
 626 out:
 627         dprintk("<-- %s status=%d\n", __func__, ret);
 628         return ret;
 629 }
 630
 631 struct nfs41_call_sync_data {
 632         const struct nfs_server *seq_server;
 633         struct nfs4_sequence_args *seq_args;
 634         struct nfs4_sequence_res *seq_res;
 635         int cache_reply;
 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, data->cache_reply, 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 cache_reply,
 679                                    int privileged)
 680 {
 681         int ret;
 682         struct rpc_task *task;
 683         struct nfs41_call_sync_data data = {
 684                 .seq_server = server,
 685                 .seq_args = args,
 686                 .seq_res = res,
 687                 .cache_reply = cache_reply,
 688         };
 689         struct rpc_task_setup task_setup = {
 690                 .rpc_client = clnt,
 691                 .rpc_message = msg,
 692                 .callback_ops = &nfs41_call_sync_ops,
 693                 .callback_data = &data
 694         };
 695
 696         res->sr_slot = NULL;
 697         if (privileged)
 698                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 699         task = rpc_run_task(&task_setup);
 700         if (IS_ERR(task))
 701                 ret = PTR_ERR(task);
 702         else {
 703                 ret = task->tk_status;
 704                 rpc_put_task(task);
 705         }
 706         return ret;
 707 }
 708
 709 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 710                             struct nfs_server *server,
 711                             struct rpc_message *msg,
 712                             struct nfs4_sequence_args *args,
 713                             struct nfs4_sequence_res *res,
 714                             int cache_reply)
 715 {
 716         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 717 }
 718
 719 #else
 720 static int nfs4_sequence_done(struct rpc_task *task,
 721                                struct nfs4_sequence_res *res)
 722 {
 723         return 1;
 724 }
 725 #endif /* CONFIG_NFS_V4_1 */
 726
 727 int _nfs4_call_sync(struct rpc_clnt *clnt,
 728                     struct nfs_server *server,
 729                     struct rpc_message *msg,
 730                     struct nfs4_sequence_args *args,
 731                     struct nfs4_sequence_res *res,
 732                     int cache_reply)
 733 {
 734         args->sa_session = res->sr_session = NULL;
 735         return rpc_call_sync(clnt, msg, 0);
 736 }
 737
 738 static inline
 739 int nfs4_call_sync(struct rpc_clnt *clnt,
 740                    struct nfs_server *server,
 741                    struct rpc_message *msg,
 742                    struct nfs4_sequence_args *args,
 743                    struct nfs4_sequence_res *res,
 744                    int cache_reply)
 745 {
 746         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 747                                                 args, res, cache_reply);
 748 }
 749
 750 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 751 {
 752         struct nfs_inode *nfsi = NFS_I(dir);
 753
 754         spin_lock(&dir->i_lock);
 755         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 756         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 757                 nfs_force_lookup_revalidate(dir);
 758         nfsi->change_attr = cinfo->after;
 759         spin_unlock(&dir->i_lock);
 760 }
 761
 762 struct nfs4_opendata {
 763         struct kref kref;
 764         struct nfs_openargs o_arg;
 765         struct nfs_openres o_res;
 766         struct nfs_open_confirmargs c_arg;
 767         struct nfs_open_confirmres c_res;
 768         struct nfs_fattr f_attr;
 769         struct nfs_fattr dir_attr;
 770         struct dentry *dir;
 771         struct dentry *dentry;
 772         struct nfs4_state_owner *owner;
 773         struct nfs4_state *state;
 774         struct iattr attrs;
 775         unsigned long timestamp;
 776         unsigned int rpc_done : 1;
 777         int rpc_status;
 778         int cancelled;
 779 };
 780
 781
 782 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 783 {
 784         p->o_res.f_attr = &p->f_attr;
 785         p->o_res.dir_attr = &p->dir_attr;
 786         p->o_res.seqid = p->o_arg.seqid;
 787         p->c_res.seqid = p->c_arg.seqid;
 788         p->o_res.server = p->o_arg.server;
 789         nfs_fattr_init(&p->f_attr);
 790         nfs_fattr_init(&p->dir_attr);
 791 }
 792
 793 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 794                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 795                 const struct iattr *attrs,
 796                 gfp_t gfp_mask)
 797 {
 798         struct dentry *parent = dget_parent(dentry);
 799         struct inode *dir = parent->d_inode;
 800         struct nfs_server *server = NFS_SERVER(dir);
 801         struct nfs4_opendata *p;
 802
 803         p = kzalloc(sizeof(*p), gfp_mask);
 804         if (p == NULL)
 805                 goto err;
 806         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 807         if (p->o_arg.seqid == NULL)
 808                 goto err_free;
 809         nfs_sb_active(dentry->d_sb);
 810         p->dentry = dget(dentry);
 811         p->dir = parent;
 812         p->owner = sp;
 813         atomic_inc(&sp->so_count);
 814         p->o_arg.fh = NFS_FH(dir);
 815         p->o_arg.open_flags = flags;
 816         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 817         p->o_arg.clientid = server->nfs_client->cl_clientid;
 818         p->o_arg.id = sp->so_owner_id.id;
 819         p->o_arg.name = &dentry->d_name;
 820         p->o_arg.server = server;
 821         p->o_arg.bitmask = server->attr_bitmask;
 822         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 823         if (flags & O_CREAT) {
 824                 u32 *s;
 825
 826                 p->o_arg.u.attrs = &p->attrs;
 827                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 828                 s = (u32 *) p->o_arg.u.verifier.data;
 829                 s[0] = jiffies;
 830                 s[1] = current->pid;
 831         }
 832         p->c_arg.fh = &p->o_res.fh;
 833         p->c_arg.stateid = &p->o_res.stateid;
 834         p->c_arg.seqid = p->o_arg.seqid;
 835         nfs4_init_opendata_res(p);
 836         kref_init(&p->kref);
 837         return p;
 838 err_free:
 839         kfree(p);
 840 err:
 841         dput(parent);
 842         return NULL;
 843 }
 844
 845 static void nfs4_opendata_free(struct kref *kref)
 846 {
 847         struct nfs4_opendata *p = container_of(kref,
 848                         struct nfs4_opendata, kref);
 849         struct super_block *sb = p->dentry->d_sb;
 850
 851         nfs_free_seqid(p->o_arg.seqid);
 852         if (p->state != NULL)
 853                 nfs4_put_open_state(p->state);
 854         nfs4_put_state_owner(p->owner);
 855         dput(p->dir);
 856         dput(p->dentry);
 857         nfs_sb_deactive(sb);
 858         kfree(p);
 859 }
 860
 861 static void nfs4_opendata_put(struct nfs4_opendata *p)
 862 {
 863         if (p != NULL)
 864                 kref_put(&p->kref, nfs4_opendata_free);
 865 }
 866
 867 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 868 {
 869         int ret;
 870
 871         ret = rpc_wait_for_completion_task(task);
 872         return ret;
 873 }
 874
 875 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 876 {
 877         int ret = 0;
 878
 879         if (open_mode & O_EXCL)
 880                 goto out;
 881         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 882                 case FMODE_READ:
 883                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 884                                 && state->n_rdonly != 0;
 885                         break;
 886                 case FMODE_WRITE:
 887                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 888                                 && state->n_wronly != 0;
 889                         break;
 890                 case FMODE_READ|FMODE_WRITE:
 891                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 892                                 && state->n_rdwr != 0;
 893         }
 894 out:
 895         return ret;
 896 }
 897
 898 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 899 {
 900         if ((delegation->type & fmode) != fmode)
 901                 return 0;
 902         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 903                 return 0;
 904         nfs_mark_delegation_referenced(delegation);
 905         return 1;
 906 }
 907
 908 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 909 {
 910         switch (fmode) {
 911                 case FMODE_WRITE:
 912                         state->n_wronly++;
 913                         break;
 914                 case FMODE_READ:
 915                         state->n_rdonly++;
 916                         break;
 917                 case FMODE_READ|FMODE_WRITE:
 918                         state->n_rdwr++;
 919         }
 920         nfs4_state_set_mode_locked(state, state->state | fmode);
 921 }
 922
 923 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 924 {
 925         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 926                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 927         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 928         switch (fmode) {
 929                 case FMODE_READ:
 930                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 931                         break;
 932                 case FMODE_WRITE:
 933                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 934                         break;
 935                 case FMODE_READ|FMODE_WRITE:
 936                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 937         }
 938 }
 939
 940 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 941 {
 942         write_seqlock(&state->seqlock);
 943         nfs_set_open_stateid_locked(state, stateid, fmode);
 944         write_sequnlock(&state->seqlock);
 945 }
 946
 947 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 948 {
 949         /*
 950          * Protect the call to nfs4_state_set_mode_locked and
 951          * serialise the stateid update
 952          */
 953         write_seqlock(&state->seqlock);
 954         if (deleg_stateid != NULL) {
 955                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 956                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 957         }
 958         if (open_stateid != NULL)
 959                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 960         write_sequnlock(&state->seqlock);
 961         spin_lock(&state->owner->so_lock);
 962         update_open_stateflags(state, fmode);
 963         spin_unlock(&state->owner->so_lock);
 964 }
 965
 966 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 967 {
 968         struct nfs_inode *nfsi = NFS_I(state->inode);
 969         struct nfs_delegation *deleg_cur;
 970         int ret = 0;
 971
 972         fmode &= (FMODE_READ|FMODE_WRITE);
 973
 974         rcu_read_lock();
 975         deleg_cur = rcu_dereference(nfsi->delegation);
 976         if (deleg_cur == NULL)
 977                 goto no_delegation;
 978
 979         spin_lock(&deleg_cur->lock);
 980         if (nfsi->delegation != deleg_cur ||
 981             (deleg_cur->type & fmode) != fmode)
 982                 goto no_delegation_unlock;
 983
 984         if (delegation == NULL)
 985                 delegation = &deleg_cur->stateid;
 986         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 987                 goto no_delegation_unlock;
 988
 989         nfs_mark_delegation_referenced(deleg_cur);
 990         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 991         ret = 1;
 992 no_delegation_unlock:
 993         spin_unlock(&deleg_cur->lock);
 994 no_delegation:
 995         rcu_read_unlock();
 996
 997         if (!ret && open_stateid != NULL) {
 998                 __update_open_stateid(state, open_stateid, NULL, fmode);
 999                 ret = 1;
1000         }
1001
1002         return ret;
1003 }
1004
1005
1006 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1007 {
1008         struct nfs_delegation *delegation;
1009
1010         rcu_read_lock();
1011         delegation = rcu_dereference(NFS_I(inode)->delegation);
1012         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1013                 rcu_read_unlock();
1014                 return;
1015         }
1016         rcu_read_unlock();
1017         nfs_inode_return_delegation(inode);
1018 }
1019
1020 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1021 {
1022         struct nfs4_state *state = opendata->state;
1023         struct nfs_inode *nfsi = NFS_I(state->inode);
1024         struct nfs_delegation *delegation;
1025         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1026         fmode_t fmode = opendata->o_arg.fmode;
1027         nfs4_stateid stateid;
1028         int ret = -EAGAIN;
1029
1030         for (;;) {
1031                 if (can_open_cached(state, fmode, open_mode)) {
1032                         spin_lock(&state->owner->so_lock);
1033                         if (can_open_cached(state, fmode, open_mode)) {
1034                                 update_open_stateflags(state, fmode);
1035                                 spin_unlock(&state->owner->so_lock);
1036                                 goto out_return_state;
1037                         }
1038                         spin_unlock(&state->owner->so_lock);
1039                 }
1040                 rcu_read_lock();
1041                 delegation = rcu_dereference(nfsi->delegation);
1042                 if (delegation == NULL ||
1043                     !can_open_delegated(delegation, fmode)) {
1044                         rcu_read_unlock();
1045                         break;
1046                 }
1047                 /* Save the delegation */
1048                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1049                 rcu_read_unlock();
1050                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1051                 if (ret != 0)
1052                         goto out;
1053                 ret = -EAGAIN;
1054
1055                 /* Try to update the stateid using the delegation */
1056                 if (update_open_stateid(state, NULL, &stateid, fmode))
1057                         goto out_return_state;
1058         }
1059 out:
1060         return ERR_PTR(ret);
1061 out_return_state:
1062         atomic_inc(&state->count);
1063         return state;
1064 }
1065
1066 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1067 {
1068         struct inode *inode;
1069         struct nfs4_state *state = NULL;
1070         struct nfs_delegation *delegation;
1071         int ret;
1072
1073         if (!data->rpc_done) {
1074                 state = nfs4_try_open_cached(data);
1075                 goto out;
1076         }
1077
1078         ret = -EAGAIN;
1079         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1080                 goto err;
1081         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1082         ret = PTR_ERR(inode);
1083         if (IS_ERR(inode))
1084                 goto err;
1085         ret = -ENOMEM;
1086         state = nfs4_get_open_state(inode, data->owner);
1087         if (state == NULL)
1088                 goto err_put_inode;
1089         if (data->o_res.delegation_type != 0) {
1090                 int delegation_flags = 0;
1091
1092                 rcu_read_lock();
1093                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1094                 if (delegation)
1095                         delegation_flags = delegation->flags;
1096                 rcu_read_unlock();
1097                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1098                         nfs_inode_set_delegation(state->inode,
1099                                         data->owner->so_cred,
1100                                         &data->o_res);
1101                 else
1102                         nfs_inode_reclaim_delegation(state->inode,
1103                                         data->owner->so_cred,
1104                                         &data->o_res);
1105         }
1106
1107         update_open_stateid(state, &data->o_res.stateid, NULL,
1108                         data->o_arg.fmode);
1109         iput(inode);
1110 out:
1111         return state;
1112 err_put_inode:
1113         iput(inode);
1114 err:
1115         return ERR_PTR(ret);
1116 }
1117
1118 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1119 {
1120         struct nfs_inode *nfsi = NFS_I(state->inode);
1121         struct nfs_open_context *ctx;
1122
1123         spin_lock(&state->inode->i_lock);
1124         list_for_each_entry(ctx, &nfsi->open_files, list) {
1125                 if (ctx->state != state)
1126                         continue;
1127                 get_nfs_open_context(ctx);
1128                 spin_unlock(&state->inode->i_lock);
1129                 return ctx;
1130         }
1131         spin_unlock(&state->inode->i_lock);
1132         return ERR_PTR(-ENOENT);
1133 }
1134
1135 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1136 {
1137         struct nfs4_opendata *opendata;
1138
1139         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1140         if (opendata == NULL)
1141                 return ERR_PTR(-ENOMEM);
1142         opendata->state = state;
1143         atomic_inc(&state->count);
1144         return opendata;
1145 }
1146
1147 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1148 {
1149         struct nfs4_state *newstate;
1150         int ret;
1151
1152         opendata->o_arg.open_flags = 0;
1153         opendata->o_arg.fmode = fmode;
1154         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1155         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1156         nfs4_init_opendata_res(opendata);
1157         ret = _nfs4_recover_proc_open(opendata);
1158         if (ret != 0)
1159                 return ret;
1160         newstate = nfs4_opendata_to_nfs4_state(opendata);
1161         if (IS_ERR(newstate))
1162                 return PTR_ERR(newstate);
1163         nfs4_close_state(newstate, fmode);
1164         *res = newstate;
1165         return 0;
1166 }
1167
1168 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1169 {
1170         struct nfs4_state *newstate;
1171         int ret;
1172
1173         /* memory barrier prior to reading state->n_* */
1174         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1175         smp_rmb();
1176         if (state->n_rdwr != 0) {
1177                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1178                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1179                 if (ret != 0)
1180                         return ret;
1181                 if (newstate != state)
1182                         return -ESTALE;
1183         }
1184         if (state->n_wronly != 0) {
1185                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1186                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1187                 if (ret != 0)
1188                         return ret;
1189                 if (newstate != state)
1190                         return -ESTALE;
1191         }
1192         if (state->n_rdonly != 0) {
1193                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1194                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1195                 if (ret != 0)
1196                         return ret;
1197                 if (newstate != state)
1198                         return -ESTALE;
1199         }
1200         /*
1201          * We may have performed cached opens for all three recoveries.
1202          * Check if we need to update the current stateid.
1203          */
1204         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1205             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1206                 write_seqlock(&state->seqlock);
1207                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1208                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1209                 write_sequnlock(&state->seqlock);
1210         }
1211         return 0;
1212 }
1213
1214 /*
1215  * OPEN_RECLAIM:
1216  *      reclaim state on the server after a reboot.
1217  */
1218 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1219 {
1220         struct nfs_delegation *delegation;
1221         struct nfs4_opendata *opendata;
1222         fmode_t delegation_type = 0;
1223         int status;
1224
1225         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1226         if (IS_ERR(opendata))
1227                 return PTR_ERR(opendata);
1228         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1229         opendata->o_arg.fh = NFS_FH(state->inode);
1230         rcu_read_lock();
1231         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1232         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1233                 delegation_type = delegation->type;
1234         rcu_read_unlock();
1235         opendata->o_arg.u.delegation_type = delegation_type;
1236         status = nfs4_open_recover(opendata, state);
1237         nfs4_opendata_put(opendata);
1238         return status;
1239 }
1240
1241 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1242 {
1243         struct nfs_server *server = NFS_SERVER(state->inode);
1244         struct nfs4_exception exception = { };
1245         int err;
1246         do {
1247                 err = _nfs4_do_open_reclaim(ctx, state);
1248                 if (err != -NFS4ERR_DELAY)
1249                         break;
1250                 nfs4_handle_exception(server, err, &exception);
1251         } while (exception.retry);
1252         return err;
1253 }
1254
1255 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1256 {
1257         struct nfs_open_context *ctx;
1258         int ret;
1259
1260         ctx = nfs4_state_find_open_context(state);
1261         if (IS_ERR(ctx))
1262                 return PTR_ERR(ctx);
1263         ret = nfs4_do_open_reclaim(ctx, state);
1264         put_nfs_open_context(ctx);
1265         return ret;
1266 }
1267
1268 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1269 {
1270         struct nfs4_opendata *opendata;
1271         int ret;
1272
1273         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1274         if (IS_ERR(opendata))
1275                 return PTR_ERR(opendata);
1276         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1277         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1278                         sizeof(opendata->o_arg.u.delegation.data));
1279         ret = nfs4_open_recover(opendata, state);
1280         nfs4_opendata_put(opendata);
1281         return ret;
1282 }
1283
1284 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1285 {
1286         struct nfs4_exception exception = { };
1287         struct nfs_server *server = NFS_SERVER(state->inode);
1288         int err;
1289         do {
1290                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1291                 switch (err) {
1292                         case 0:
1293                         case -ENOENT:
1294                         case -ESTALE:
1295                                 goto out;
1296                         case -NFS4ERR_BADSESSION:
1297                         case -NFS4ERR_BADSLOT:
1298                         case -NFS4ERR_BAD_HIGH_SLOT:
1299                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1300                         case -NFS4ERR_DEADSESSION:
1301                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1302                                 goto out;
1303                         case -NFS4ERR_STALE_CLIENTID:
1304                         case -NFS4ERR_STALE_STATEID:
1305                         case -NFS4ERR_EXPIRED:
1306                                 /* Don't recall a delegation if it was lost */
1307                                 nfs4_schedule_lease_recovery(server->nfs_client);
1308                                 goto out;
1309                         case -ERESTARTSYS:
1310                                 /*
1311                                  * The show must go on: exit, but mark the
1312                                  * stateid as needing recovery.
1313                                  */
1314                         case -NFS4ERR_ADMIN_REVOKED:
1315                         case -NFS4ERR_BAD_STATEID:
1316                                 nfs4_schedule_stateid_recovery(server, state);
1317                         case -EKEYEXPIRED:
1318                                 /*
1319                                  * User RPCSEC_GSS context has expired.
1320                                  * We cannot recover this stateid now, so
1321                                  * skip it and allow recovery thread to
1322                                  * proceed.
1323                                  */
1324                         case -ENOMEM:
1325                                 err = 0;
1326                                 goto out;
1327                 }
1328                 err = nfs4_handle_exception(server, err, &exception);
1329         } while (exception.retry);
1330 out:
1331         return err;
1332 }
1333
1334 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1335 {
1336         struct nfs4_opendata *data = calldata;
1337
1338         data->rpc_status = task->tk_status;
1339         if (data->rpc_status == 0) {
1340                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1341                                 sizeof(data->o_res.stateid.data));
1342                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1343                 renew_lease(data->o_res.server, data->timestamp);
1344                 data->rpc_done = 1;
1345         }
1346 }
1347
1348 static void nfs4_open_confirm_release(void *calldata)
1349 {
1350         struct nfs4_opendata *data = calldata;
1351         struct nfs4_state *state = NULL;
1352
1353         /* If this request hasn't been cancelled, do nothing */
1354         if (data->cancelled == 0)
1355                 goto out_free;
1356         /* In case of error, no cleanup! */
1357         if (!data->rpc_done)
1358                 goto out_free;
1359         state = nfs4_opendata_to_nfs4_state(data);
1360         if (!IS_ERR(state))
1361                 nfs4_close_state(state, data->o_arg.fmode);
1362 out_free:
1363         nfs4_opendata_put(data);
1364 }
1365
1366 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1367         .rpc_call_done = nfs4_open_confirm_done,
1368         .rpc_release = nfs4_open_confirm_release,
1369 };
1370
1371 /*
1372  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1373  */
1374 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1375 {
1376         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1377         struct rpc_task *task;
1378         struct  rpc_message msg = {
1379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1380                 .rpc_argp = &data->c_arg,
1381                 .rpc_resp = &data->c_res,
1382                 .rpc_cred = data->owner->so_cred,
1383         };
1384         struct rpc_task_setup task_setup_data = {
1385                 .rpc_client = server->client,
1386                 .rpc_message = &msg,
1387                 .callback_ops = &nfs4_open_confirm_ops,
1388                 .callback_data = data,
1389                 .workqueue = nfsiod_workqueue,
1390                 .flags = RPC_TASK_ASYNC,
1391         };
1392         int status;
1393
1394         kref_get(&data->kref);
1395         data->rpc_done = 0;
1396         data->rpc_status = 0;
1397         data->timestamp = jiffies;
1398         task = rpc_run_task(&task_setup_data);
1399         if (IS_ERR(task))
1400                 return PTR_ERR(task);
1401         status = nfs4_wait_for_completion_rpc_task(task);
1402         if (status != 0) {
1403                 data->cancelled = 1;
1404                 smp_wmb();
1405         } else
1406                 status = data->rpc_status;
1407         rpc_put_task(task);
1408         return status;
1409 }
1410
1411 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1412 {
1413         struct nfs4_opendata *data = calldata;
1414         struct nfs4_state_owner *sp = data->owner;
1415
1416         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1417                 return;
1418         /*
1419          * Check if we still need to send an OPEN call, or if we can use
1420          * a delegation instead.
1421          */
1422         if (data->state != NULL) {
1423                 struct nfs_delegation *delegation;
1424
1425                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1426                         goto out_no_action;
1427                 rcu_read_lock();
1428                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1429                 if (delegation != NULL &&
1430                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1431                         rcu_read_unlock();
1432                         goto out_no_action;
1433                 }
1434                 rcu_read_unlock();
1435         }
1436         /* Update sequence id. */
1437         data->o_arg.id = sp->so_owner_id.id;
1438         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1439         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1440                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1441                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1442         }
1443         data->timestamp = jiffies;
1444         if (nfs4_setup_sequence(data->o_arg.server,
1445                                 &data->o_arg.seq_args,
1446                                 &data->o_res.seq_res, 1, task))
1447                 return;
1448         rpc_call_start(task);
1449         return;
1450 out_no_action:
1451         task->tk_action = NULL;
1452
1453 }
1454
1455 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1456 {
1457         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1458         nfs4_open_prepare(task, calldata);
1459 }
1460
1461 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1462 {
1463         struct nfs4_opendata *data = calldata;
1464
1465         data->rpc_status = task->tk_status;
1466
1467         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1468                 return;
1469
1470         if (task->tk_status == 0) {
1471                 switch (data->o_res.f_attr->mode & S_IFMT) {
1472                         case S_IFREG:
1473                                 break;
1474                         case S_IFLNK:
1475                                 data->rpc_status = -ELOOP;
1476                                 break;
1477                         case S_IFDIR:
1478                                 data->rpc_status = -EISDIR;
1479                                 break;
1480                         default:
1481                                 data->rpc_status = -ENOTDIR;
1482                 }
1483                 renew_lease(data->o_res.server, data->timestamp);
1484                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1485                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1486         }
1487         data->rpc_done = 1;
1488 }
1489
1490 static void nfs4_open_release(void *calldata)
1491 {
1492         struct nfs4_opendata *data = calldata;
1493         struct nfs4_state *state = NULL;
1494
1495         /* If this request hasn't been cancelled, do nothing */
1496         if (data->cancelled == 0)
1497                 goto out_free;
1498         /* In case of error, no cleanup! */
1499         if (data->rpc_status != 0 || !data->rpc_done)
1500                 goto out_free;
1501         /* In case we need an open_confirm, no cleanup! */
1502         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1503                 goto out_free;
1504         state = nfs4_opendata_to_nfs4_state(data);
1505         if (!IS_ERR(state))
1506                 nfs4_close_state(state, data->o_arg.fmode);
1507 out_free:
1508         nfs4_opendata_put(data);
1509 }
1510
1511 static const struct rpc_call_ops nfs4_open_ops = {
1512         .rpc_call_prepare = nfs4_open_prepare,
1513         .rpc_call_done = nfs4_open_done,
1514         .rpc_release = nfs4_open_release,
1515 };
1516
1517 static const struct rpc_call_ops nfs4_recover_open_ops = {
1518         .rpc_call_prepare = nfs4_recover_open_prepare,
1519         .rpc_call_done = nfs4_open_done,
1520         .rpc_release = nfs4_open_release,
1521 };
1522
1523 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1524 {
1525         struct inode *dir = data->dir->d_inode;
1526         struct nfs_server *server = NFS_SERVER(dir);
1527         struct nfs_openargs *o_arg = &data->o_arg;
1528         struct nfs_openres *o_res = &data->o_res;
1529         struct rpc_task *task;
1530         struct rpc_message msg = {
1531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1532                 .rpc_argp = o_arg,
1533                 .rpc_resp = o_res,
1534                 .rpc_cred = data->owner->so_cred,
1535         };
1536         struct rpc_task_setup task_setup_data = {
1537                 .rpc_client = server->client,
1538                 .rpc_message = &msg,
1539                 .callback_ops = &nfs4_open_ops,
1540                 .callback_data = data,
1541                 .workqueue = nfsiod_workqueue,
1542                 .flags = RPC_TASK_ASYNC,
1543         };
1544         int status;
1545
1546         kref_get(&data->kref);
1547         data->rpc_done = 0;
1548         data->rpc_status = 0;
1549         data->cancelled = 0;
1550         if (isrecover)
1551                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1552         task = rpc_run_task(&task_setup_data);
1553         if (IS_ERR(task))
1554                 return PTR_ERR(task);
1555         status = nfs4_wait_for_completion_rpc_task(task);
1556         if (status != 0) {
1557                 data->cancelled = 1;
1558                 smp_wmb();
1559         } else
1560                 status = data->rpc_status;
1561         rpc_put_task(task);
1562
1563         return status;
1564 }
1565
1566 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1567 {
1568         struct inode *dir = data->dir->d_inode;
1569         struct nfs_openres *o_res = &data->o_res;
1570         int status;
1571
1572         status = nfs4_run_open_task(data, 1);
1573         if (status != 0 || !data->rpc_done)
1574                 return status;
1575
1576         nfs_refresh_inode(dir, o_res->dir_attr);
1577
1578         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1579                 status = _nfs4_proc_open_confirm(data);
1580                 if (status != 0)
1581                         return status;
1582         }
1583
1584         return status;
1585 }
1586
1587 /*
1588  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1589  */
1590 static int _nfs4_proc_open(struct nfs4_opendata *data)
1591 {
1592         struct inode *dir = data->dir->d_inode;
1593         struct nfs_server *server = NFS_SERVER(dir);
1594         struct nfs_openargs *o_arg = &data->o_arg;
1595         struct nfs_openres *o_res = &data->o_res;
1596         int status;
1597
1598         status = nfs4_run_open_task(data, 0);
1599         if (status != 0 || !data->rpc_done)
1600                 return status;
1601
1602         if (o_arg->open_flags & O_CREAT) {
1603                 update_changeattr(dir, &o_res->cinfo);
1604                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1605         } else
1606                 nfs_refresh_inode(dir, o_res->dir_attr);
1607         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1608                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1609         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1610                 status = _nfs4_proc_open_confirm(data);
1611                 if (status != 0)
1612                         return status;
1613         }
1614         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1615                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1616         return 0;
1617 }
1618
1619 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1620 {
1621         unsigned int loop;
1622         int ret;
1623
1624         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1625                 ret = nfs4_wait_clnt_recover(clp);
1626                 if (ret != 0)
1627                         break;
1628                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1629                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1630                         break;
1631                 nfs4_schedule_state_manager(clp);
1632                 ret = -EIO;
1633         }
1634         return ret;
1635 }
1636
1637 static int nfs4_recover_expired_lease(struct nfs_server *server)
1638 {
1639         return nfs4_client_recover_expired_lease(server->nfs_client);
1640 }
1641
1642 /*
1643  * OPEN_EXPIRED:
1644  *      reclaim state on the server after a network partition.
1645  *      Assumes caller holds the appropriate lock
1646  */
1647 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1648 {
1649         struct nfs4_opendata *opendata;
1650         int ret;
1651
1652         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1653         if (IS_ERR(opendata))
1654                 return PTR_ERR(opendata);
1655         ret = nfs4_open_recover(opendata, state);
1656         if (ret == -ESTALE)
1657                 d_drop(ctx->dentry);
1658         nfs4_opendata_put(opendata);
1659         return ret;
1660 }
1661
1662 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1663 {
1664         struct nfs_server *server = NFS_SERVER(state->inode);
1665         struct nfs4_exception exception = { };
1666         int err;
1667
1668         do {
1669                 err = _nfs4_open_expired(ctx, state);
1670                 switch (err) {
1671                 default:
1672                         goto out;
1673                 case -NFS4ERR_GRACE:
1674                 case -NFS4ERR_DELAY:
1675                         nfs4_handle_exception(server, err, &exception);
1676                         err = 0;
1677                 }
1678         } while (exception.retry);
1679 out:
1680         return err;
1681 }
1682
1683 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1684 {
1685         struct nfs_open_context *ctx;
1686         int ret;
1687
1688         ctx = nfs4_state_find_open_context(state);
1689         if (IS_ERR(ctx))
1690                 return PTR_ERR(ctx);
1691         ret = nfs4_do_open_expired(ctx, state);
1692         put_nfs_open_context(ctx);
1693         return ret;
1694 }
1695
1696 #if defined(CONFIG_NFS_V4_1)
1697 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1698 {
1699         int status;
1700         struct nfs_server *server = NFS_SERVER(state->inode);
1701
1702         status = nfs41_test_stateid(server, state);
1703         if (status == NFS_OK)
1704                 return 0;
1705         nfs41_free_stateid(server, state);
1706         return nfs4_open_expired(sp, state);
1707 }
1708 #endif
1709
1710 /*
1711  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1712  * fields corresponding to attributes that were used to store the verifier.
1713  * Make sure we clobber those fields in the later setattr call
1714  */
1715 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1716 {
1717         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1718             !(sattr->ia_valid & ATTR_ATIME_SET))
1719                 sattr->ia_valid |= ATTR_ATIME;
1720
1721         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1722             !(sattr->ia_valid & ATTR_MTIME_SET))
1723                 sattr->ia_valid |= ATTR_MTIME;
1724 }
1725
1726 /*
1727  * Returns a referenced nfs4_state
1728  */
1729 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)
1730 {
1731         struct nfs4_state_owner  *sp;
1732         struct nfs4_state     *state = NULL;
1733         struct nfs_server       *server = NFS_SERVER(dir);
1734         struct nfs4_opendata *opendata;
1735         int status;
1736
1737         /* Protect against reboot recovery conflicts */
1738         status = -ENOMEM;
1739         if (!(sp = nfs4_get_state_owner(server, cred))) {
1740                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1741                 goto out_err;
1742         }
1743         status = nfs4_recover_expired_lease(server);
1744         if (status != 0)
1745                 goto err_put_state_owner;
1746         if (dentry->d_inode != NULL)
1747                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1748         status = -ENOMEM;
1749         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1750         if (opendata == NULL)
1751                 goto err_put_state_owner;
1752
1753         if (dentry->d_inode != NULL)
1754                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1755
1756         status = _nfs4_proc_open(opendata);
1757         if (status != 0)
1758                 goto err_opendata_put;
1759
1760         state = nfs4_opendata_to_nfs4_state(opendata);
1761         status = PTR_ERR(state);
1762         if (IS_ERR(state))
1763                 goto err_opendata_put;
1764         if (server->caps & NFS_CAP_POSIX_LOCK)
1765                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1766
1767         if (opendata->o_arg.open_flags & O_EXCL) {
1768                 nfs4_exclusive_attrset(opendata, sattr);
1769
1770                 nfs_fattr_init(opendata->o_res.f_attr);
1771                 status = nfs4_do_setattr(state->inode, cred,
1772                                 opendata->o_res.f_attr, sattr,
1773                                 state);
1774                 if (status == 0)
1775                         nfs_setattr_update_inode(state->inode, sattr);
1776                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1777         }
1778         nfs4_opendata_put(opendata);
1779         nfs4_put_state_owner(sp);
1780         *res = state;
1781         return 0;
1782 err_opendata_put:
1783         nfs4_opendata_put(opendata);
1784 err_put_state_owner:
1785         nfs4_put_state_owner(sp);
1786 out_err:
1787         *res = NULL;
1788         return status;
1789 }
1790
1791
1792 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)
1793 {
1794         struct nfs4_exception exception = { };
1795         struct nfs4_state *res;
1796         int status;
1797
1798         do {
1799                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1800                 if (status == 0)
1801                         break;
1802                 /* NOTE: BAD_SEQID means the server and client disagree about the
1803                  * book-keeping w.r.t. state-changing operations
1804                  * (OPEN/CLOSE/LOCK/LOCKU...)
1805                  * It is actually a sign of a bug on the client or on the server.
1806                  *
1807                  * If we receive a BAD_SEQID error in the particular case of
1808                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1809                  * have unhashed the old state_owner for us, and that we can
1810                  * therefore safely retry using a new one. We should still warn
1811                  * the user though...
1812                  */
1813                 if (status == -NFS4ERR_BAD_SEQID) {
1814                         printk(KERN_WARNING "NFS: v4 server %s "
1815                                         " returned a bad sequence-id error!\n",
1816                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1817                         exception.retry = 1;
1818                         continue;
1819                 }
1820                 /*
1821                  * BAD_STATEID on OPEN means that the server cancelled our
1822                  * state before it received the OPEN_CONFIRM.
1823                  * Recover by retrying the request as per the discussion
1824                  * on Page 181 of RFC3530.
1825                  */
1826                 if (status == -NFS4ERR_BAD_STATEID) {
1827                         exception.retry = 1;
1828                         continue;
1829                 }
1830                 if (status == -EAGAIN) {
1831                         /* We must have found a delegation */
1832                         exception.retry = 1;
1833                         continue;
1834                 }
1835                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1836                                         status, &exception));
1837         } while (exception.retry);
1838         return res;
1839 }
1840
1841 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1842                             struct nfs_fattr *fattr, struct iattr *sattr,
1843                             struct nfs4_state *state)
1844 {
1845         struct nfs_server *server = NFS_SERVER(inode);
1846         struct nfs_setattrargs  arg = {
1847                 .fh             = NFS_FH(inode),
1848                 .iap            = sattr,
1849                 .server         = server,
1850                 .bitmask = server->attr_bitmask,
1851         };
1852         struct nfs_setattrres  res = {
1853                 .fattr          = fattr,
1854                 .server         = server,
1855         };
1856         struct rpc_message msg = {
1857                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1858                 .rpc_argp       = &arg,
1859                 .rpc_resp       = &res,
1860                 .rpc_cred       = cred,
1861         };
1862         unsigned long timestamp = jiffies;
1863         int status;
1864
1865         nfs_fattr_init(fattr);
1866
1867         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1868                 /* Use that stateid */
1869         } else if (state != NULL) {
1870                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1871         } else
1872                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1873
1874         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1875         if (status == 0 && state != NULL)
1876                 renew_lease(server, timestamp);
1877         return status;
1878 }
1879
1880 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1881                            struct nfs_fattr *fattr, struct iattr *sattr,
1882                            struct nfs4_state *state)
1883 {
1884         struct nfs_server *server = NFS_SERVER(inode);
1885         struct nfs4_exception exception = { };
1886         int err;
1887         do {
1888                 err = nfs4_handle_exception(server,
1889                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1890                                 &exception);
1891         } while (exception.retry);
1892         return err;
1893 }
1894
1895 struct nfs4_closedata {
1896         struct inode *inode;
1897         struct nfs4_state *state;
1898         struct nfs_closeargs arg;
1899         struct nfs_closeres res;
1900         struct nfs_fattr fattr;
1901         unsigned long timestamp;
1902         bool roc;
1903         u32 roc_barrier;
1904 };
1905
1906 static void nfs4_free_closedata(void *data)
1907 {
1908         struct nfs4_closedata *calldata = data;
1909         struct nfs4_state_owner *sp = calldata->state->owner;
1910         struct super_block *sb = calldata->state->inode->i_sb;
1911
1912         if (calldata->roc)
1913                 pnfs_roc_release(calldata->state->inode);
1914         nfs4_put_open_state(calldata->state);
1915         nfs_free_seqid(calldata->arg.seqid);
1916         nfs4_put_state_owner(sp);
1917         nfs_sb_deactive(sb);
1918         kfree(calldata);
1919 }
1920
1921 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1922                 fmode_t fmode)
1923 {
1924         spin_lock(&state->owner->so_lock);
1925         if (!(fmode & FMODE_READ))
1926                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1927         if (!(fmode & FMODE_WRITE))
1928                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1929         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1930         spin_unlock(&state->owner->so_lock);
1931 }
1932
1933 static void nfs4_close_done(struct rpc_task *task, void *data)
1934 {
1935         struct nfs4_closedata *calldata = data;
1936         struct nfs4_state *state = calldata->state;
1937         struct nfs_server *server = NFS_SERVER(calldata->inode);
1938
1939         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1940                 return;
1941         /* hmm. we are done with the inode, and in the process of freeing
1942          * the state_owner. we keep this around to process errors
1943          */
1944         switch (task->tk_status) {
1945                 case 0:
1946                         if (calldata->roc)
1947                                 pnfs_roc_set_barrier(state->inode,
1948                                                      calldata->roc_barrier);
1949                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1950                         renew_lease(server, calldata->timestamp);
1951                         nfs4_close_clear_stateid_flags(state,
1952                                         calldata->arg.fmode);
1953                         break;
1954                 case -NFS4ERR_STALE_STATEID:
1955                 case -NFS4ERR_OLD_STATEID:
1956                 case -NFS4ERR_BAD_STATEID:
1957                 case -NFS4ERR_EXPIRED:
1958                         if (calldata->arg.fmode == 0)
1959                                 break;
1960                 default:
1961                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1962                                 rpc_restart_call_prepare(task);
1963         }
1964         nfs_release_seqid(calldata->arg.seqid);
1965         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1966 }
1967
1968 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1969 {
1970         struct nfs4_closedata *calldata = data;
1971         struct nfs4_state *state = calldata->state;
1972         int call_close = 0;
1973
1974         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1975                 return;
1976
1977         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1978         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1979         spin_lock(&state->owner->so_lock);
1980         /* Calculate the change in open mode */
1981         if (state->n_rdwr == 0) {
1982                 if (state->n_rdonly == 0) {
1983                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1984                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1985                         calldata->arg.fmode &= ~FMODE_READ;
1986                 }
1987                 if (state->n_wronly == 0) {
1988                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1989                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1990                         calldata->arg.fmode &= ~FMODE_WRITE;
1991                 }
1992         }
1993         spin_unlock(&state->owner->so_lock);
1994
1995         if (!call_close) {
1996                 /* Note: exit _without_ calling nfs4_close_done */
1997                 task->tk_action = NULL;
1998                 return;
1999         }
2000
2001         if (calldata->arg.fmode == 0) {
2002                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2003                 if (calldata->roc &&
2004                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2005                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2006                                      task, NULL);
2007                         return;
2008                 }
2009         }
2010
2011         nfs_fattr_init(calldata->res.fattr);
2012         calldata->timestamp = jiffies;
2013         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2014                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2015                                 1, task))
2016                 return;
2017         rpc_call_start(task);
2018 }
2019
2020 static const struct rpc_call_ops nfs4_close_ops = {
2021         .rpc_call_prepare = nfs4_close_prepare,
2022         .rpc_call_done = nfs4_close_done,
2023         .rpc_release = nfs4_free_closedata,
2024 };
2025
2026 /*
2027  * It is possible for data to be read/written from a mem-mapped file
2028  * after the sys_close call (which hits the vfs layer as a flush).
2029  * This means that we can't safely call nfsv4 close on a file until
2030  * the inode is cleared. This in turn means that we are not good
2031  * NFSv4 citizens - we do not indicate to the server to update the file's
2032  * share state even when we are done with one of the three share
2033  * stateid's in the inode.
2034  *
2035  * NOTE: Caller must be holding the sp->so_owner semaphore!
2036  */
2037 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2038 {
2039         struct nfs_server *server = NFS_SERVER(state->inode);
2040         struct nfs4_closedata *calldata;
2041         struct nfs4_state_owner *sp = state->owner;
2042         struct rpc_task *task;
2043         struct rpc_message msg = {
2044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2045                 .rpc_cred = state->owner->so_cred,
2046         };
2047         struct rpc_task_setup task_setup_data = {
2048                 .rpc_client = server->client,
2049                 .rpc_message = &msg,
2050                 .callback_ops = &nfs4_close_ops,
2051                 .workqueue = nfsiod_workqueue,
2052                 .flags = RPC_TASK_ASYNC,
2053         };
2054         int status = -ENOMEM;
2055
2056         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2057         if (calldata == NULL)
2058                 goto out;
2059         calldata->inode = state->inode;
2060         calldata->state = state;
2061         calldata->arg.fh = NFS_FH(state->inode);
2062         calldata->arg.stateid = &state->open_stateid;
2063         /* Serialization for the sequence id */
2064         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2065         if (calldata->arg.seqid == NULL)
2066                 goto out_free_calldata;
2067         calldata->arg.fmode = 0;
2068         calldata->arg.bitmask = server->cache_consistency_bitmask;
2069         calldata->res.fattr = &calldata->fattr;
2070         calldata->res.seqid = calldata->arg.seqid;
2071         calldata->res.server = server;
2072         calldata->roc = roc;
2073         nfs_sb_active(calldata->inode->i_sb);
2074
2075         msg.rpc_argp = &calldata->arg;
2076         msg.rpc_resp = &calldata->res;
2077         task_setup_data.callback_data = calldata;
2078         task = rpc_run_task(&task_setup_data);
2079         if (IS_ERR(task))
2080                 return PTR_ERR(task);
2081         status = 0;
2082         if (wait)
2083                 status = rpc_wait_for_completion_task(task);
2084         rpc_put_task(task);
2085         return status;
2086 out_free_calldata:
2087         kfree(calldata);
2088 out:
2089         if (roc)
2090                 pnfs_roc_release(state->inode);
2091         nfs4_put_open_state(state);
2092         nfs4_put_state_owner(sp);
2093         return status;
2094 }
2095
2096 static struct inode *
2097 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2098 {
2099         struct nfs4_state *state;
2100
2101         /* Protect against concurrent sillydeletes */
2102         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2103         if (IS_ERR(state))
2104                 return ERR_CAST(state);
2105         ctx->state = state;
2106         return igrab(state->inode);
2107 }
2108
2109 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2110 {
2111         if (ctx->state == NULL)
2112                 return;
2113         if (is_sync)
2114                 nfs4_close_sync(ctx->state, ctx->mode);
2115         else
2116                 nfs4_close_state(ctx->state, ctx->mode);
2117 }
2118
2119 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2120 {
2121         struct nfs4_server_caps_arg args = {
2122                 .fhandle = fhandle,
2123         };
2124         struct nfs4_server_caps_res res = {};
2125         struct rpc_message msg = {
2126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2127                 .rpc_argp = &args,
2128                 .rpc_resp = &res,
2129         };
2130         int status;
2131
2132         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2133         if (status == 0) {
2134                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2135                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2136                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2137                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2138                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2139                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2140                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2141                         server->caps |= NFS_CAP_ACLS;
2142                 if (res.has_links != 0)
2143                         server->caps |= NFS_CAP_HARDLINKS;
2144                 if (res.has_symlinks != 0)
2145                         server->caps |= NFS_CAP_SYMLINKS;
2146                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2147                         server->caps |= NFS_CAP_FILEID;
2148                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2149                         server->caps |= NFS_CAP_MODE;
2150                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2151                         server->caps |= NFS_CAP_NLINK;
2152                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2153                         server->caps |= NFS_CAP_OWNER;
2154                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2155                         server->caps |= NFS_CAP_OWNER_GROUP;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2157                         server->caps |= NFS_CAP_ATIME;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2159                         server->caps |= NFS_CAP_CTIME;
2160                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2161                         server->caps |= NFS_CAP_MTIME;
2162
2163                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2164                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2165                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2166                 server->acl_bitmask = res.acl_bitmask;
2167         }
2168
2169         return status;
2170 }
2171
2172 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2173 {
2174         struct nfs4_exception exception = { };
2175         int err;
2176         do {
2177                 err = nfs4_handle_exception(server,
2178                                 _nfs4_server_capabilities(server, fhandle),
2179                                 &exception);
2180         } while (exception.retry);
2181         return err;
2182 }
2183
2184 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2185                 struct nfs_fsinfo *info)
2186 {
2187         struct nfs4_lookup_root_arg args = {
2188                 .bitmask = nfs4_fattr_bitmap,
2189         };
2190         struct nfs4_lookup_res res = {
2191                 .server = server,
2192                 .fattr = info->fattr,
2193                 .fh = fhandle,
2194         };
2195         struct rpc_message msg = {
2196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2197                 .rpc_argp = &args,
2198                 .rpc_resp = &res,
2199         };
2200
2201         nfs_fattr_init(info->fattr);
2202         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2203 }
2204
2205 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2206                 struct nfs_fsinfo *info)
2207 {
2208         struct nfs4_exception exception = { };
2209         int err;
2210         do {
2211                 err = _nfs4_lookup_root(server, fhandle, info);
2212                 switch (err) {
2213                 case 0:
2214                 case -NFS4ERR_WRONGSEC:
2215                         break;
2216                 default:
2217                         err = nfs4_handle_exception(server, err, &exception);
2218                 }
2219         } while (exception.retry);
2220         return err;
2221 }
2222
2223 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2224                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2225 {
2226         struct rpc_auth *auth;
2227         int ret;
2228
2229         auth = rpcauth_create(flavor, server->client);
2230         if (!auth) {
2231                 ret = -EIO;
2232                 goto out;
2233         }
2234         ret = nfs4_lookup_root(server, fhandle, info);
2235 out:
2236         return ret;
2237 }
2238
2239 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2240                               struct nfs_fsinfo *info)
2241 {
2242         int i, len, status = 0;
2243         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2244
2245         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2246         flav_array[len] = RPC_AUTH_NULL;
2247         len += 1;
2248
2249         for (i = 0; i < len; i++) {
2250                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2251                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2252                         continue;
2253                 break;
2254         }
2255         /*
2256          * -EACCESS could mean that the user doesn't have correct permissions
2257          * to access the mount.  It could also mean that we tried to mount
2258          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2259          * existing mount programs don't handle -EACCES very well so it should
2260          * be mapped to -EPERM instead.
2261          */
2262         if (status == -EACCES)
2263                 status = -EPERM;
2264         return status;
2265 }
2266
2267 /*
2268  * get the file handle for the "/" directory on the server
2269  */
2270 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271                               struct nfs_fsinfo *info)
2272 {
2273         int minor_version = server->nfs_client->cl_minorversion;
2274         int status = nfs4_lookup_root(server, fhandle, info);
2275         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2276                 /*
2277                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2278                  * by nfs4_map_errors() as this function exits.
2279                  */
2280                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2281         if (status == 0)
2282                 status = nfs4_server_capabilities(server, fhandle);
2283         if (status == 0)
2284                 status = nfs4_do_fsinfo(server, fhandle, info);
2285         return nfs4_map_errors(status);
2286 }
2287
2288 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2289 /*
2290  * Get locations and (maybe) other attributes of a referral.
2291  * Note that we'll actually follow the referral later when
2292  * we detect fsid mismatch in inode revalidation
2293  */
2294 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2295                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2296 {
2297         int status = -ENOMEM;
2298         struct page *page = NULL;
2299         struct nfs4_fs_locations *locations = NULL;
2300
2301         page = alloc_page(GFP_KERNEL);
2302         if (page == NULL)
2303                 goto out;
2304         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2305         if (locations == NULL)
2306                 goto out;
2307
2308         status = nfs4_proc_fs_locations(dir, name, locations, page);
2309         if (status != 0)
2310                 goto out;
2311         /* Make sure server returned a different fsid for the referral */
2312         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2313                 dprintk("%s: server did not return a different fsid for"
2314                         " a referral at %s\n", __func__, name->name);
2315                 status = -EIO;
2316                 goto out;
2317         }
2318         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2319         nfs_fixup_referral_attributes(&locations->fattr);
2320
2321         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2322         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2323         memset(fhandle, 0, sizeof(struct nfs_fh));
2324 out:
2325         if (page)
2326                 __free_page(page);
2327         kfree(locations);
2328         return status;
2329 }
2330
2331 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2332 {
2333         struct nfs4_getattr_arg args = {
2334                 .fh = fhandle,
2335                 .bitmask = server->attr_bitmask,
2336         };
2337         struct nfs4_getattr_res res = {
2338                 .fattr = fattr,
2339                 .server = server,
2340         };
2341         struct rpc_message msg = {
2342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2343                 .rpc_argp = &args,
2344                 .rpc_resp = &res,
2345         };
2346
2347         nfs_fattr_init(fattr);
2348         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2349 }
2350
2351 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2352 {
2353         struct nfs4_exception exception = { };
2354         int err;
2355         do {
2356                 err = nfs4_handle_exception(server,
2357                                 _nfs4_proc_getattr(server, fhandle, fattr),
2358                                 &exception);
2359         } while (exception.retry);
2360         return err;
2361 }
2362
2363 /*
2364  * The file is not closed if it is opened due to the a request to change
2365  * the size of the file. The open call will not be needed once the
2366  * VFS layer lookup-intents are implemented.
2367  *
2368  * Close is called when the inode is destroyed.
2369  * If we haven't opened the file for O_WRONLY, we
2370  * need to in the size_change case to obtain a stateid.
2371  *
2372  * Got race?
2373  * Because OPEN is always done by name in nfsv4, it is
2374  * possible that we opened a different file by the same
2375  * name.  We can recognize this race condition, but we
2376  * can't do anything about it besides returning an error.
2377  *
2378  * This will be fixed with VFS changes (lookup-intent).
2379  */
2380 static int
2381 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2382                   struct iattr *sattr)
2383 {
2384         struct inode *inode = dentry->d_inode;
2385         struct rpc_cred *cred = NULL;
2386         struct nfs4_state *state = NULL;
2387         int status;
2388
2389         if (pnfs_ld_layoutret_on_setattr(inode))
2390                 pnfs_return_layout(inode);
2391
2392         nfs_fattr_init(fattr);
2393
2394         /* Search for an existing open(O_WRITE) file */
2395         if (sattr->ia_valid & ATTR_FILE) {
2396                 struct nfs_open_context *ctx;
2397
2398                 ctx = nfs_file_open_context(sattr->ia_file);
2399                 if (ctx) {
2400                         cred = ctx->cred;
2401                         state = ctx->state;
2402                 }
2403         }
2404
2405         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2406         if (status == 0)
2407                 nfs_setattr_update_inode(inode, sattr);
2408         return status;
2409 }
2410
2411 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2412                 const struct nfs_fh *dirfh, const struct qstr *name,
2413                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2414 {
2415         int                    status;
2416         struct nfs4_lookup_arg args = {
2417                 .bitmask = server->attr_bitmask,
2418                 .dir_fh = dirfh,
2419                 .name = name,
2420         };
2421         struct nfs4_lookup_res res = {
2422                 .server = server,
2423                 .fattr = fattr,
2424                 .fh = fhandle,
2425         };
2426         struct rpc_message msg = {
2427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2428                 .rpc_argp = &args,
2429                 .rpc_resp = &res,
2430         };
2431
2432         nfs_fattr_init(fattr);
2433
2434         dprintk("NFS call  lookupfh %s\n", name->name);
2435         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2436         dprintk("NFS reply lookupfh: %d\n", status);
2437         return status;
2438 }
2439
2440 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2441                               struct qstr *name, struct nfs_fh *fhandle,
2442                               struct nfs_fattr *fattr)
2443 {
2444         struct nfs4_exception exception = { };
2445         int err;
2446         do {
2447                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2448                 /* FIXME: !!!! */
2449                 if (err == -NFS4ERR_MOVED) {
2450                         err = -EREMOTE;
2451                         break;
2452                 }
2453                 err = nfs4_handle_exception(server, err, &exception);
2454         } while (exception.retry);
2455         return err;
2456 }
2457
2458 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2459                 const struct qstr *name, struct nfs_fh *fhandle,
2460                 struct nfs_fattr *fattr)
2461 {
2462         int status;
2463
2464         dprintk("NFS call  lookup %s\n", name->name);
2465         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2466         if (status == -NFS4ERR_MOVED)
2467                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2468         dprintk("NFS reply lookup: %d\n", status);
2469         return status;
2470 }
2471
2472 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2473 {
2474         memset(fh, 0, sizeof(struct nfs_fh));
2475         fattr->fsid.major = 1;
2476         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2477                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2478         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2479         fattr->nlink = 2;
2480 }
2481
2482 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2483                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2484 {
2485         struct nfs4_exception exception = { };
2486         int err;
2487         do {
2488                 err = nfs4_handle_exception(NFS_SERVER(dir),
2489                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2490                                 &exception);
2491                 if (err == -EPERM)
2492                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2493         } while (exception.retry);
2494         return err;
2495 }
2496
2497 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2498 {
2499         struct nfs_server *server = NFS_SERVER(inode);
2500         struct nfs4_accessargs args = {
2501                 .fh = NFS_FH(inode),
2502                 .bitmask = server->attr_bitmask,
2503         };
2504         struct nfs4_accessres res = {
2505                 .server = server,
2506         };
2507         struct rpc_message msg = {
2508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2509                 .rpc_argp = &args,
2510                 .rpc_resp = &res,
2511                 .rpc_cred = entry->cred,
2512         };
2513         int mode = entry->mask;
2514         int status;
2515
2516         /*
2517          * Determine which access bits we want to ask for...
2518          */
2519         if (mode & MAY_READ)
2520                 args.access |= NFS4_ACCESS_READ;
2521         if (S_ISDIR(inode->i_mode)) {
2522                 if (mode & MAY_WRITE)
2523                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2524                 if (mode & MAY_EXEC)
2525                         args.access |= NFS4_ACCESS_LOOKUP;
2526         } else {
2527                 if (mode & MAY_WRITE)
2528                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2529                 if (mode & MAY_EXEC)
2530                         args.access |= NFS4_ACCESS_EXECUTE;
2531         }
2532
2533         res.fattr = nfs_alloc_fattr();
2534         if (res.fattr == NULL)
2535                 return -ENOMEM;
2536
2537         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2538         if (!status) {
2539                 entry->mask = 0;
2540                 if (res.access & NFS4_ACCESS_READ)
2541                         entry->mask |= MAY_READ;
2542                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2543                         entry->mask |= MAY_WRITE;
2544                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2545                         entry->mask |= MAY_EXEC;
2546                 nfs_refresh_inode(inode, res.fattr);
2547         }
2548         nfs_free_fattr(res.fattr);
2549         return status;
2550 }
2551
2552 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2553 {
2554         struct nfs4_exception exception = { };
2555         int err;
2556         do {
2557                 err = nfs4_handle_exception(NFS_SERVER(inode),
2558                                 _nfs4_proc_access(inode, entry),
2559                                 &exception);
2560         } while (exception.retry);
2561         return err;
2562 }
2563
2564 /*
2565  * TODO: For the time being, we don't try to get any attributes
2566  * along with any of the zero-copy operations READ, READDIR,
2567  * READLINK, WRITE.
2568  *
2569  * In the case of the first three, we want to put the GETATTR
2570  * after the read-type operation -- this is because it is hard
2571  * to predict the length of a GETATTR response in v4, and thus
2572  * align the READ data correctly.  This means that the GETATTR
2573  * may end up partially falling into the page cache, and we should
2574  * shift it into the 'tail' of the xdr_buf before processing.
2575  * To do this efficiently, we need to know the total length
2576  * of data received, which doesn't seem to be available outside
2577  * of the RPC layer.
2578  *
2579  * In the case of WRITE, we also want to put the GETATTR after
2580  * the operation -- in this case because we want to make sure
2581  * we get the post-operation mtime and size.  This means that
2582  * we can't use xdr_encode_pages() as written: we need a variant
2583  * of it which would leave room in the 'tail' iovec.
2584  *
2585  * Both of these changes to the XDR layer would in fact be quite
2586  * minor, but I decided to leave them for a subsequent patch.
2587  */
2588 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2589                 unsigned int pgbase, unsigned int pglen)
2590 {
2591         struct nfs4_readlink args = {
2592                 .fh       = NFS_FH(inode),
2593                 .pgbase   = pgbase,
2594                 .pglen    = pglen,
2595                 .pages    = &page,
2596         };
2597         struct nfs4_readlink_res res;
2598         struct rpc_message msg = {
2599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2600                 .rpc_argp = &args,
2601                 .rpc_resp = &res,
2602         };
2603
2604         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2605 }
2606
2607 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2608                 unsigned int pgbase, unsigned int pglen)
2609 {
2610         struct nfs4_exception exception = { };
2611         int err;
2612         do {
2613                 err = nfs4_handle_exception(NFS_SERVER(inode),
2614                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2615                                 &exception);
2616         } while (exception.retry);
2617         return err;
2618 }
2619
2620 /*
2621  * Got race?
2622  * We will need to arrange for the VFS layer to provide an atomic open.
2623  * Until then, this create/open method is prone to inefficiency and race
2624  * conditions due to the lookup, create, and open VFS calls from sys_open()
2625  * placed on the wire.
2626  *
2627  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2628  * The file will be opened again in the subsequent VFS open call
2629  * (nfs4_proc_file_open).
2630  *
2631  * The open for read will just hang around to be used by any process that
2632  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2633  */
2634
2635 static int
2636 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2637                  int flags, struct nfs_open_context *ctx)
2638 {
2639         struct dentry *de = dentry;
2640         struct nfs4_state *state;
2641         struct rpc_cred *cred = NULL;
2642         fmode_t fmode = 0;
2643         int status = 0;
2644
2645         if (ctx != NULL) {
2646                 cred = ctx->cred;
2647                 de = ctx->dentry;
2648                 fmode = ctx->mode;
2649         }
2650         sattr->ia_mode &= ~current_umask();
2651         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2652         d_drop(dentry);
2653         if (IS_ERR(state)) {
2654                 status = PTR_ERR(state);
2655                 goto out;
2656         }
2657         d_add(dentry, igrab(state->inode));
2658         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2659         if (ctx != NULL)
2660                 ctx->state = state;
2661         else
2662                 nfs4_close_sync(state, fmode);
2663 out:
2664         return status;
2665 }
2666
2667 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2668 {
2669         struct nfs_server *server = NFS_SERVER(dir);
2670         struct nfs_removeargs args = {
2671                 .fh = NFS_FH(dir),
2672                 .name.len = name->len,
2673                 .name.name = name->name,
2674                 .bitmask = server->attr_bitmask,
2675         };
2676         struct nfs_removeres res = {
2677                 .server = server,
2678         };
2679         struct rpc_message msg = {
2680                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2681                 .rpc_argp = &args,
2682                 .rpc_resp = &res,
2683         };
2684         int status = -ENOMEM;
2685
2686         res.dir_attr = nfs_alloc_fattr();
2687         if (res.dir_attr == NULL)
2688                 goto out;
2689
2690         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2691         if (status == 0) {
2692                 update_changeattr(dir, &res.cinfo);
2693                 nfs_post_op_update_inode(dir, res.dir_attr);
2694         }
2695         nfs_free_fattr(res.dir_attr);
2696 out:
2697         return status;
2698 }
2699
2700 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2701 {
2702         struct nfs4_exception exception = { };
2703         int err;
2704         do {
2705                 err = nfs4_handle_exception(NFS_SERVER(dir),
2706                                 _nfs4_proc_remove(dir, name),
2707                                 &exception);
2708         } while (exception.retry);
2709         return err;
2710 }
2711
2712 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2713 {
2714         struct nfs_server *server = NFS_SERVER(dir);
2715         struct nfs_removeargs *args = msg->rpc_argp;
2716         struct nfs_removeres *res = msg->rpc_resp;
2717
2718         args->bitmask = server->cache_consistency_bitmask;
2719         res->server = server;
2720         res->seq_res.sr_slot = NULL;
2721         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2722 }
2723
2724 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2725 {
2726         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2727
2728         if (!nfs4_sequence_done(task, &res->seq_res))
2729                 return 0;
2730         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2731                 return 0;
2732         update_changeattr(dir, &res->cinfo);
2733         nfs_post_op_update_inode(dir, res->dir_attr);
2734         return 1;
2735 }
2736
2737 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2738 {
2739         struct nfs_server *server = NFS_SERVER(dir);
2740         struct nfs_renameargs *arg = msg->rpc_argp;
2741         struct nfs_renameres *res = msg->rpc_resp;
2742
2743         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2744         arg->bitmask = server->attr_bitmask;
2745         res->server = server;
2746 }
2747
2748 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2749                                  struct inode *new_dir)
2750 {
2751         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2752
2753         if (!nfs4_sequence_done(task, &res->seq_res))
2754                 return 0;
2755         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2756                 return 0;
2757
2758         update_changeattr(old_dir, &res->old_cinfo);
2759         nfs_post_op_update_inode(old_dir, res->old_fattr);
2760         update_changeattr(new_dir, &res->new_cinfo);
2761         nfs_post_op_update_inode(new_dir, res->new_fattr);
2762         return 1;
2763 }
2764
2765 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2766                 struct inode *new_dir, struct qstr *new_name)
2767 {
2768         struct nfs_server *server = NFS_SERVER(old_dir);
2769         struct nfs_renameargs arg = {
2770                 .old_dir = NFS_FH(old_dir),
2771                 .new_dir = NFS_FH(new_dir),
2772                 .old_name = old_name,
2773                 .new_name = new_name,
2774                 .bitmask = server->attr_bitmask,
2775         };
2776         struct nfs_renameres res = {
2777                 .server = server,
2778         };
2779         struct rpc_message msg = {
2780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2781                 .rpc_argp = &arg,
2782                 .rpc_resp = &res,
2783         };
2784         int status = -ENOMEM;
2785
2786         res.old_fattr = nfs_alloc_fattr();
2787         res.new_fattr = nfs_alloc_fattr();
2788         if (res.old_fattr == NULL || res.new_fattr == NULL)
2789                 goto out;
2790
2791         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2792         if (!status) {
2793                 update_changeattr(old_dir, &res.old_cinfo);
2794                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2795                 update_changeattr(new_dir, &res.new_cinfo);
2796                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2797         }
2798 out:
2799         nfs_free_fattr(res.new_fattr);
2800         nfs_free_fattr(res.old_fattr);
2801         return status;
2802 }
2803
2804 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2805                 struct inode *new_dir, struct qstr *new_name)
2806 {
2807         struct nfs4_exception exception = { };
2808         int err;
2809         do {
2810                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2811                                 _nfs4_proc_rename(old_dir, old_name,
2812                                         new_dir, new_name),
2813                                 &exception);
2814         } while (exception.retry);
2815         return err;
2816 }
2817
2818 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2819 {
2820         struct nfs_server *server = NFS_SERVER(inode);
2821         struct nfs4_link_arg arg = {
2822                 .fh     = NFS_FH(inode),
2823                 .dir_fh = NFS_FH(dir),
2824                 .name   = name,
2825                 .bitmask = server->attr_bitmask,
2826         };
2827         struct nfs4_link_res res = {
2828                 .server = server,
2829         };
2830         struct rpc_message msg = {
2831                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2832                 .rpc_argp = &arg,
2833                 .rpc_resp = &res,
2834         };
2835         int status = -ENOMEM;
2836
2837         res.fattr = nfs_alloc_fattr();
2838         res.dir_attr = nfs_alloc_fattr();
2839         if (res.fattr == NULL || res.dir_attr == NULL)
2840                 goto out;
2841
2842         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2843         if (!status) {
2844                 update_changeattr(dir, &res.cinfo);
2845                 nfs_post_op_update_inode(dir, res.dir_attr);
2846                 nfs_post_op_update_inode(inode, res.fattr);
2847         }
2848 out:
2849         nfs_free_fattr(res.dir_attr);
2850         nfs_free_fattr(res.fattr);
2851         return status;
2852 }
2853
2854 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2855 {
2856         struct nfs4_exception exception = { };
2857         int err;
2858         do {
2859                 err = nfs4_handle_exception(NFS_SERVER(inode),
2860                                 _nfs4_proc_link(inode, dir, name),
2861                                 &exception);
2862         } while (exception.retry);
2863         return err;
2864 }
2865
2866 struct nfs4_createdata {
2867         struct rpc_message msg;
2868         struct nfs4_create_arg arg;
2869         struct nfs4_create_res res;
2870         struct nfs_fh fh;
2871         struct nfs_fattr fattr;
2872         struct nfs_fattr dir_fattr;
2873 };
2874
2875 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2876                 struct qstr *name, struct iattr *sattr, u32 ftype)
2877 {
2878         struct nfs4_createdata *data;
2879
2880         data = kzalloc(sizeof(*data), GFP_KERNEL);
2881         if (data != NULL) {
2882                 struct nfs_server *server = NFS_SERVER(dir);
2883
2884                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2885                 data->msg.rpc_argp = &data->arg;
2886                 data->msg.rpc_resp = &data->res;
2887                 data->arg.dir_fh = NFS_FH(dir);
2888                 data->arg.server = server;
2889                 data->arg.name = name;
2890                 data->arg.attrs = sattr;
2891                 data->arg.ftype = ftype;
2892                 data->arg.bitmask = server->attr_bitmask;
2893                 data->res.server = server;
2894                 data->res.fh = &data->fh;
2895                 data->res.fattr = &data->fattr;
2896                 data->res.dir_fattr = &data->dir_fattr;
2897                 nfs_fattr_init(data->res.fattr);
2898                 nfs_fattr_init(data->res.dir_fattr);
2899         }
2900         return data;
2901 }
2902
2903 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2904 {
2905         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2906                                     &data->arg.seq_args, &data->res.seq_res, 1);
2907         if (status == 0) {
2908                 update_changeattr(dir, &data->res.dir_cinfo);
2909                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2910                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2911         }
2912         return status;
2913 }
2914
2915 static void nfs4_free_createdata(struct nfs4_createdata *data)
2916 {
2917         kfree(data);
2918 }
2919
2920 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2921                 struct page *page, unsigned int len, struct iattr *sattr)
2922 {
2923         struct nfs4_createdata *data;
2924         int status = -ENAMETOOLONG;
2925
2926         if (len > NFS4_MAXPATHLEN)
2927                 goto out;
2928
2929         status = -ENOMEM;
2930         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2931         if (data == NULL)
2932                 goto out;
2933
2934         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2935         data->arg.u.symlink.pages = &page;
2936         data->arg.u.symlink.len = len;
2937
2938         status = nfs4_do_create(dir, dentry, data);
2939
2940         nfs4_free_createdata(data);
2941 out:
2942         return status;
2943 }
2944
2945 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2946                 struct page *page, unsigned int len, struct iattr *sattr)
2947 {
2948         struct nfs4_exception exception = { };
2949         int err;
2950         do {
2951                 err = nfs4_handle_exception(NFS_SERVER(dir),
2952                                 _nfs4_proc_symlink(dir, dentry, page,
2953                                                         len, sattr),
2954                                 &exception);
2955         } while (exception.retry);
2956         return err;
2957 }
2958
2959 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2960                 struct iattr *sattr)
2961 {
2962         struct nfs4_createdata *data;
2963         int status = -ENOMEM;
2964
2965         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2966         if (data == NULL)
2967                 goto out;
2968
2969         status = nfs4_do_create(dir, dentry, data);
2970
2971         nfs4_free_createdata(data);
2972 out:
2973         return status;
2974 }
2975
2976 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2977                 struct iattr *sattr)
2978 {
2979         struct nfs4_exception exception = { };
2980         int err;
2981
2982         sattr->ia_mode &= ~current_umask();
2983         do {
2984                 err = nfs4_handle_exception(NFS_SERVER(dir),
2985                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2986                                 &exception);
2987         } while (exception.retry);
2988         return err;
2989 }
2990
2991 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2992                 u64 cookie, struct page **pages, unsigned int count, int plus)
2993 {
2994         struct inode            *dir = dentry->d_inode;
2995         struct nfs4_readdir_arg args = {
2996                 .fh = NFS_FH(dir),
2997                 .pages = pages,
2998                 .pgbase = 0,
2999                 .count = count,
3000                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3001                 .plus = plus,
3002         };
3003         struct nfs4_readdir_res res;
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3006                 .rpc_argp = &args,
3007                 .rpc_resp = &res,
3008                 .rpc_cred = cred,
3009         };
3010         int                     status;
3011
3012         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3013                         dentry->d_parent->d_name.name,
3014                         dentry->d_name.name,
3015                         (unsigned long long)cookie);
3016         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3017         res.pgbase = args.pgbase;
3018         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3019         if (status >= 0) {
3020                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3021                 status += args.pgbase;
3022         }
3023
3024         nfs_invalidate_atime(dir);
3025
3026         dprintk("%s: returns %d\n", __func__, status);
3027         return status;
3028 }
3029
3030 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3031                 u64 cookie, struct page **pages, unsigned int count, int plus)
3032 {
3033         struct nfs4_exception exception = { };
3034         int err;
3035         do {
3036                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3037                                 _nfs4_proc_readdir(dentry, cred, cookie,
3038                                         pages, count, plus),
3039                                 &exception);
3040         } while (exception.retry);
3041         return err;
3042 }
3043
3044 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3045                 struct iattr *sattr, dev_t rdev)
3046 {
3047         struct nfs4_createdata *data;
3048         int mode = sattr->ia_mode;
3049         int status = -ENOMEM;
3050
3051         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3052         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3053
3054         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3055         if (data == NULL)
3056                 goto out;
3057
3058         if (S_ISFIFO(mode))
3059                 data->arg.ftype = NF4FIFO;
3060         else if (S_ISBLK(mode)) {
3061                 data->arg.ftype = NF4BLK;
3062                 data->arg.u.device.specdata1 = MAJOR(rdev);
3063                 data->arg.u.device.specdata2 = MINOR(rdev);
3064         }
3065         else if (S_ISCHR(mode)) {
3066                 data->arg.ftype = NF4CHR;
3067                 data->arg.u.device.specdata1 = MAJOR(rdev);
3068                 data->arg.u.device.specdata2 = MINOR(rdev);
3069         }
3070
3071         status = nfs4_do_create(dir, dentry, data);
3072
3073         nfs4_free_createdata(data);
3074 out:
3075         return status;
3076 }
3077
3078 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3079                 struct iattr *sattr, dev_t rdev)
3080 {
3081         struct nfs4_exception exception = { };
3082         int err;
3083
3084         sattr->ia_mode &= ~current_umask();
3085         do {
3086                 err = nfs4_handle_exception(NFS_SERVER(dir),
3087                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3088                                 &exception);
3089         } while (exception.retry);
3090         return err;
3091 }
3092
3093 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3094                  struct nfs_fsstat *fsstat)
3095 {
3096         struct nfs4_statfs_arg args = {
3097                 .fh = fhandle,
3098                 .bitmask = server->attr_bitmask,
3099         };
3100         struct nfs4_statfs_res res = {
3101                 .fsstat = fsstat,
3102         };
3103         struct rpc_message msg = {
3104                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3105                 .rpc_argp = &args,
3106                 .rpc_resp = &res,
3107         };
3108
3109         nfs_fattr_init(fsstat->fattr);
3110         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3111 }
3112
3113 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3114 {
3115         struct nfs4_exception exception = { };
3116         int err;
3117         do {
3118                 err = nfs4_handle_exception(server,
3119                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3120                                 &exception);
3121         } while (exception.retry);
3122         return err;
3123 }
3124
3125 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3126                 struct nfs_fsinfo *fsinfo)
3127 {
3128         struct nfs4_fsinfo_arg args = {
3129                 .fh = fhandle,
3130                 .bitmask = server->attr_bitmask,
3131         };
3132         struct nfs4_fsinfo_res res = {
3133                 .fsinfo = fsinfo,
3134         };
3135         struct rpc_message msg = {
3136                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3137                 .rpc_argp = &args,
3138                 .rpc_resp = &res,
3139         };
3140
3141         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3142 }
3143
3144 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3145 {
3146         struct nfs4_exception exception = { };
3147         int err;
3148
3149         do {
3150                 err = nfs4_handle_exception(server,
3151                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3152                                 &exception);
3153         } while (exception.retry);
3154         return err;
3155 }
3156
3157 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3158 {
3159         nfs_fattr_init(fsinfo->fattr);
3160         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3161 }
3162
3163 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3164                 struct nfs_pathconf *pathconf)
3165 {
3166         struct nfs4_pathconf_arg args = {
3167                 .fh = fhandle,
3168                 .bitmask = server->attr_bitmask,
3169         };
3170         struct nfs4_pathconf_res res = {
3171                 .pathconf = pathconf,
3172         };
3173         struct rpc_message msg = {
3174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3175                 .rpc_argp = &args,
3176                 .rpc_resp = &res,
3177         };
3178
3179         /* None of the pathconf attributes are mandatory to implement */
3180         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3181                 memset(pathconf, 0, sizeof(*pathconf));
3182                 return 0;
3183         }
3184
3185         nfs_fattr_init(pathconf->fattr);
3186         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3187 }
3188
3189 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3190                 struct nfs_pathconf *pathconf)
3191 {
3192         struct nfs4_exception exception = { };
3193         int err;
3194
3195         do {
3196                 err = nfs4_handle_exception(server,
3197                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3198                                 &exception);
3199         } while (exception.retry);
3200         return err;
3201 }
3202
3203 void __nfs4_read_done_cb(struct nfs_read_data *data)
3204 {
3205         nfs_invalidate_atime(data->inode);
3206 }
3207
3208 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3209 {
3210         struct nfs_server *server = NFS_SERVER(data->inode);
3211
3212         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3213                 nfs_restart_rpc(task, server->nfs_client);
3214                 return -EAGAIN;
3215         }
3216
3217         __nfs4_read_done_cb(data);
3218         if (task->tk_status > 0)
3219                 renew_lease(server, data->timestamp);
3220         return 0;
3221 }
3222
3223 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3224 {
3225
3226         dprintk("--> %s\n", __func__);
3227
3228         if (!nfs4_sequence_done(task, &data->res.seq_res))
3229                 return -EAGAIN;
3230
3231         return data->read_done_cb ? data->read_done_cb(task, data) :
3232                                     nfs4_read_done_cb(task, data);
3233 }
3234
3235 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3236 {
3237         data->timestamp   = jiffies;
3238         data->read_done_cb = nfs4_read_done_cb;
3239         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3240 }
3241
3242 /* Reset the the nfs_read_data to send the read to the MDS. */
3243 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3244 {
3245         dprintk("%s Reset task for i/o through\n", __func__);
3246         put_lseg(data->lseg);
3247         data->lseg = NULL;
3248         /* offsets will differ in the dense stripe case */
3249         data->args.offset = data->mds_offset;
3250         data->ds_clp = NULL;
3251         data->args.fh     = NFS_FH(data->inode);
3252         data->read_done_cb = nfs4_read_done_cb;
3253         task->tk_ops = data->mds_ops;
3254         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3255 }
3256 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3257
3258 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3259 {
3260         struct inode *inode = data->inode;
3261
3262         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3263                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3264                 return -EAGAIN;
3265         }
3266         if (task->tk_status >= 0) {
3267                 renew_lease(NFS_SERVER(inode), data->timestamp);
3268                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3269         }
3270         return 0;
3271 }
3272
3273 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3274 {
3275         if (!nfs4_sequence_done(task, &data->res.seq_res))
3276                 return -EAGAIN;
3277         return data->write_done_cb ? data->write_done_cb(task, data) :
3278                 nfs4_write_done_cb(task, data);
3279 }
3280
3281 /* Reset the the nfs_write_data to send the write to the MDS. */
3282 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3283 {
3284         dprintk("%s Reset task for i/o through\n", __func__);
3285         put_lseg(data->lseg);
3286         data->lseg          = NULL;
3287         data->ds_clp        = NULL;
3288         data->write_done_cb = nfs4_write_done_cb;
3289         data->args.fh       = NFS_FH(data->inode);
3290         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3291         data->args.offset   = data->mds_offset;
3292         data->res.fattr     = &data->fattr;
3293         task->tk_ops        = data->mds_ops;
3294         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3295 }
3296 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3297
3298 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3299 {
3300         struct nfs_server *server = NFS_SERVER(data->inode);
3301
3302         if (data->lseg) {
3303                 data->args.bitmask = NULL;
3304                 data->res.fattr = NULL;
3305         } else
3306                 data->args.bitmask = server->cache_consistency_bitmask;
3307         if (!data->write_done_cb)
3308                 data->write_done_cb = nfs4_write_done_cb;
3309         data->res.server = server;
3310         data->timestamp   = jiffies;
3311
3312         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3313 }
3314
3315 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3316 {
3317         struct inode *inode = data->inode;
3318
3319         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3320                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3321                 return -EAGAIN;
3322         }
3323         nfs_refresh_inode(inode, data->res.fattr);
3324         return 0;
3325 }
3326
3327 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3328 {
3329         if (!nfs4_sequence_done(task, &data->res.seq_res))
3330                 return -EAGAIN;
3331         return data->write_done_cb(task, data);
3332 }
3333
3334 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3335 {
3336         struct nfs_server *server = NFS_SERVER(data->inode);
3337
3338         if (data->lseg) {
3339                 data->args.bitmask = NULL;
3340                 data->res.fattr = NULL;
3341         } else
3342                 data->args.bitmask = server->cache_consistency_bitmask;
3343         if (!data->write_done_cb)
3344                 data->write_done_cb = nfs4_commit_done_cb;
3345         data->res.server = server;
3346         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3347 }
3348
3349 struct nfs4_renewdata {
3350         struct nfs_client       *client;
3351         unsigned long           timestamp;
3352 };
3353
3354 /*
3355  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3356  * standalone procedure for queueing an asynchronous RENEW.
3357  */
3358 static void nfs4_renew_release(void *calldata)
3359 {
3360         struct nfs4_renewdata *data = calldata;
3361         struct nfs_client *clp = data->client;
3362
3363         if (atomic_read(&clp->cl_count) > 1)
3364                 nfs4_schedule_state_renewal(clp);
3365         nfs_put_client(clp);
3366         kfree(data);
3367 }
3368
3369 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3370 {
3371         struct nfs4_renewdata *data = calldata;
3372         struct nfs_client *clp = data->client;
3373         unsigned long timestamp = data->timestamp;
3374
3375         if (task->tk_status < 0) {
3376                 /* Unless we're shutting down, schedule state recovery! */
3377                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3378                         return;
3379                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3380                         nfs4_schedule_lease_recovery(clp);
3381                         return;
3382                 }
3383                 nfs4_schedule_path_down_recovery(clp);
3384         }
3385         do_renew_lease(clp, timestamp);
3386 }
3387
3388 static const struct rpc_call_ops nfs4_renew_ops = {
3389         .rpc_call_done = nfs4_renew_done,
3390         .rpc_release = nfs4_renew_release,
3391 };
3392
3393 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3394 {
3395         struct rpc_message msg = {
3396                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3397                 .rpc_argp       = clp,
3398                 .rpc_cred       = cred,
3399         };
3400         struct nfs4_renewdata *data;
3401
3402         if (renew_flags == 0)
3403                 return 0;
3404         if (!atomic_inc_not_zero(&clp->cl_count))
3405                 return -EIO;
3406         data = kmalloc(sizeof(*data), GFP_NOFS);
3407         if (data == NULL)
3408                 return -ENOMEM;
3409         data->client = clp;
3410         data->timestamp = jiffies;
3411         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3412                         &nfs4_renew_ops, data);
3413 }
3414
3415 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3416 {
3417         struct rpc_message msg = {
3418                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3419                 .rpc_argp       = clp,
3420                 .rpc_cred       = cred,
3421         };
3422         unsigned long now = jiffies;
3423         int status;
3424
3425         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3426         if (status < 0)
3427                 return status;
3428         do_renew_lease(clp, now);
3429         return 0;
3430 }
3431
3432 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3433 {
3434         return (server->caps & NFS_CAP_ACLS)
3435                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3436                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3437 }
3438
3439 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3440  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3441  * the stack.
3442  */
3443 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3444
3445 static void buf_to_pages(const void *buf, size_t buflen,
3446                 struct page **pages, unsigned int *pgbase)
3447 {
3448         const void *p = buf;
3449
3450         *pgbase = offset_in_page(buf);
3451         p -= *pgbase;
3452         while (p < buf + buflen) {
3453                 *(pages++) = virt_to_page(p);
3454                 p += PAGE_CACHE_SIZE;
3455         }
3456 }
3457
3458 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3459                 struct page **pages, unsigned int *pgbase)
3460 {
3461         struct page *newpage, **spages;
3462         int rc = 0;
3463         size_t len;
3464         spages = pages;
3465
3466         do {
3467                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3468                 newpage = alloc_page(GFP_KERNEL);
3469
3470                 if (newpage == NULL)
3471                         goto unwind;
3472                 memcpy(page_address(newpage), buf, len);
3473                 buf += len;
3474                 buflen -= len;
3475                 *pages++ = newpage;
3476                 rc++;
3477         } while (buflen != 0);
3478
3479         return rc;
3480
3481 unwind:
3482         for(; rc > 0; rc--)
3483                 __free_page(spages[rc-1]);
3484         return -ENOMEM;
3485 }
3486
3487 struct nfs4_cached_acl {
3488         int cached;
3489         size_t len;
3490         char data[0];
3491 };
3492
3493 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3494 {
3495         struct nfs_inode *nfsi = NFS_I(inode);
3496
3497         spin_lock(&inode->i_lock);
3498         kfree(nfsi->nfs4_acl);
3499         nfsi->nfs4_acl = acl;
3500         spin_unlock(&inode->i_lock);
3501 }
3502
3503 static void nfs4_zap_acl_attr(struct inode *inode)
3504 {
3505         nfs4_set_cached_acl(inode, NULL);
3506 }
3507
3508 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3509 {
3510         struct nfs_inode *nfsi = NFS_I(inode);
3511         struct nfs4_cached_acl *acl;
3512         int ret = -ENOENT;
3513
3514         spin_lock(&inode->i_lock);
3515         acl = nfsi->nfs4_acl;
3516         if (acl == NULL)
3517                 goto out;
3518         if (buf == NULL) /* user is just asking for length */
3519                 goto out_len;
3520         if (acl->cached == 0)
3521                 goto out;
3522         ret = -ERANGE; /* see getxattr(2) man page */
3523         if (acl->len > buflen)
3524                 goto out;
3525         memcpy(buf, acl->data, acl->len);
3526 out_len:
3527         ret = acl->len;
3528 out:
3529         spin_unlock(&inode->i_lock);
3530         return ret;
3531 }
3532
3533 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3534 {
3535         struct nfs4_cached_acl *acl;
3536
3537         if (buf && acl_len <= PAGE_SIZE) {
3538                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3539                 if (acl == NULL)
3540                         goto out;
3541                 acl->cached = 1;
3542                 memcpy(acl->data, buf, acl_len);
3543         } else {
3544                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3545                 if (acl == NULL)
3546                         goto out;
3547                 acl->cached = 0;
3548         }
3549         acl->len = acl_len;
3550 out:
3551         nfs4_set_cached_acl(inode, acl);
3552 }
3553
3554 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3555 {
3556         struct page *pages[NFS4ACL_MAXPAGES];
3557         struct nfs_getaclargs args = {
3558                 .fh = NFS_FH(inode),
3559                 .acl_pages = pages,
3560                 .acl_len = buflen,
3561         };
3562         struct nfs_getaclres res = {
3563                 .acl_len = buflen,
3564         };
3565         void *resp_buf;
3566         struct rpc_message msg = {
3567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3568                 .rpc_argp = &args,
3569                 .rpc_resp = &res,
3570         };
3571         struct page *localpage = NULL;
3572         int ret;
3573
3574         if (buflen < PAGE_SIZE) {
3575                 /* As long as we're doing a round trip to the server anyway,
3576                  * let's be prepared for a page of acl data. */
3577                 localpage = alloc_page(GFP_KERNEL);
3578                 resp_buf = page_address(localpage);
3579                 if (localpage == NULL)
3580                         return -ENOMEM;
3581                 args.acl_pages[0] = localpage;
3582                 args.acl_pgbase = 0;
3583                 args.acl_len = PAGE_SIZE;
3584         } else {
3585                 resp_buf = buf;
3586                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3587         }
3588         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3589         if (ret)
3590                 goto out_free;
3591         if (res.acl_len > args.acl_len)
3592                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3593         else
3594                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3595         if (buf) {
3596                 ret = -ERANGE;
3597                 if (res.acl_len > buflen)
3598                         goto out_free;
3599                 if (localpage)
3600                         memcpy(buf, resp_buf, res.acl_len);
3601         }
3602         ret = res.acl_len;
3603 out_free:
3604         if (localpage)
3605                 __free_page(localpage);
3606         return ret;
3607 }
3608
3609 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3610 {
3611         struct nfs4_exception exception = { };
3612         ssize_t ret;
3613         do {
3614                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3615                 if (ret >= 0)
3616                         break;
3617                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3618         } while (exception.retry);
3619         return ret;
3620 }
3621
3622 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3623 {
3624         struct nfs_server *server = NFS_SERVER(inode);
3625         int ret;
3626
3627         if (!nfs4_server_supports_acls(server))
3628                 return -EOPNOTSUPP;
3629         ret = nfs_revalidate_inode(server, inode);
3630         if (ret < 0)
3631                 return ret;
3632         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3633                 nfs_zap_acl_cache(inode);
3634         ret = nfs4_read_cached_acl(inode, buf, buflen);
3635         if (ret != -ENOENT)
3636                 return ret;
3637         return nfs4_get_acl_uncached(inode, buf, buflen);
3638 }
3639
3640 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3641 {
3642         struct nfs_server *server = NFS_SERVER(inode);
3643         struct page *pages[NFS4ACL_MAXPAGES];
3644         struct nfs_setaclargs arg = {
3645                 .fh             = NFS_FH(inode),
3646                 .acl_pages      = pages,
3647                 .acl_len        = buflen,
3648         };
3649         struct nfs_setaclres res;
3650         struct rpc_message msg = {
3651                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3652                 .rpc_argp       = &arg,
3653                 .rpc_resp       = &res,
3654         };
3655         int ret, i;
3656
3657         if (!nfs4_server_supports_acls(server))
3658                 return -EOPNOTSUPP;
3659         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3660         if (i < 0)
3661                 return i;
3662         nfs_inode_return_delegation(inode);
3663         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3664
3665         /*
3666          * Free each page after tx, so the only ref left is
3667          * held by the network stack
3668          */
3669         for (; i > 0; i--)
3670                 put_page(pages[i-1]);
3671
3672         /*
3673          * Acl update can result in inode attribute update.
3674          * so mark the attribute cache invalid.
3675          */
3676         spin_lock(&inode->i_lock);
3677         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3678         spin_unlock(&inode->i_lock);
3679         nfs_access_zap_cache(inode);
3680         nfs_zap_acl_cache(inode);
3681         return ret;
3682 }
3683
3684 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3685 {
3686         struct nfs4_exception exception = { };
3687         int err;
3688         do {
3689                 err = nfs4_handle_exception(NFS_SERVER(inode),
3690                                 __nfs4_proc_set_acl(inode, buf, buflen),
3691                                 &exception);
3692         } while (exception.retry);
3693         return err;
3694 }
3695
3696 static int
3697 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3698 {
3699         struct nfs_client *clp = server->nfs_client;
3700
3701         if (task->tk_status >= 0)
3702                 return 0;
3703         switch(task->tk_status) {
3704                 case -NFS4ERR_ADMIN_REVOKED:
3705                 case -NFS4ERR_BAD_STATEID:
3706                 case -NFS4ERR_OPENMODE:
3707                         if (state == NULL)
3708                                 break;
3709                         nfs4_schedule_stateid_recovery(server, state);
3710                         goto wait_on_recovery;
3711                 case -NFS4ERR_EXPIRED:
3712                         if (state != NULL)
3713                                 nfs4_schedule_stateid_recovery(server, state);
3714                 case -NFS4ERR_STALE_STATEID:
3715                 case -NFS4ERR_STALE_CLIENTID:
3716                         nfs4_schedule_lease_recovery(clp);
3717                         goto wait_on_recovery;
3718 #if defined(CONFIG_NFS_V4_1)
3719                 case -NFS4ERR_BADSESSION:
3720                 case -NFS4ERR_BADSLOT:
3721                 case -NFS4ERR_BAD_HIGH_SLOT:
3722                 case -NFS4ERR_DEADSESSION:
3723                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3724                 case -NFS4ERR_SEQ_FALSE_RETRY:
3725                 case -NFS4ERR_SEQ_MISORDERED:
3726                         dprintk("%s ERROR %d, Reset session\n", __func__,
3727                                 task->tk_status);
3728                         nfs4_schedule_session_recovery(clp->cl_session);
3729                         task->tk_status = 0;
3730                         return -EAGAIN;
3731 #endif /* CONFIG_NFS_V4_1 */
3732                 case -NFS4ERR_DELAY:
3733                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3734                 case -NFS4ERR_GRACE:
3735                 case -EKEYEXPIRED:
3736                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3737                         task->tk_status = 0;
3738                         return -EAGAIN;
3739                 case -NFS4ERR_RETRY_UNCACHED_REP:
3740                 case -NFS4ERR_OLD_STATEID:
3741                         task->tk_status = 0;
3742                         return -EAGAIN;
3743         }
3744         task->tk_status = nfs4_map_errors(task->tk_status);
3745         return 0;
3746 wait_on_recovery:
3747         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3748         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3749                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3750         task->tk_status = 0;
3751         return -EAGAIN;
3752 }
3753
3754 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3755                 unsigned short port, struct rpc_cred *cred,
3756                 struct nfs4_setclientid_res *res)
3757 {
3758         nfs4_verifier sc_verifier;
3759         struct nfs4_setclientid setclientid = {
3760                 .sc_verifier = &sc_verifier,
3761                 .sc_prog = program,
3762                 .sc_cb_ident = clp->cl_cb_ident,
3763         };
3764         struct rpc_message msg = {
3765                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3766                 .rpc_argp = &setclientid,
3767                 .rpc_resp = res,
3768                 .rpc_cred = cred,
3769         };
3770         __be32 *p;
3771         int loop = 0;
3772         int status;
3773
3774         p = (__be32*)sc_verifier.data;
3775         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3776         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3777
3778         for(;;) {
3779                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3780                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3781                                 clp->cl_ipaddr,
3782                                 rpc_peeraddr2str(clp->cl_rpcclient,
3783                                                         RPC_DISPLAY_ADDR),
3784                                 rpc_peeraddr2str(clp->cl_rpcclient,
3785                                                         RPC_DISPLAY_PROTO),
3786                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3787                                 clp->cl_id_uniquifier);
3788                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3789                                 sizeof(setclientid.sc_netid),
3790                                 rpc_peeraddr2str(clp->cl_rpcclient,
3791                                                         RPC_DISPLAY_NETID));
3792                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3793                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3794                                 clp->cl_ipaddr, port >> 8, port & 255);
3795
3796                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3797                 if (status != -NFS4ERR_CLID_INUSE)
3798                         break;
3799                 if (loop != 0) {
3800                         ++clp->cl_id_uniquifier;
3801                         break;
3802                 }
3803                 ++loop;
3804                 ssleep(clp->cl_lease_time / HZ + 1);
3805         }
3806         return status;
3807 }
3808
3809 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3810                 struct nfs4_setclientid_res *arg,
3811                 struct rpc_cred *cred)
3812 {
3813         struct nfs_fsinfo fsinfo;
3814         struct rpc_message msg = {
3815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3816                 .rpc_argp = arg,
3817                 .rpc_resp = &fsinfo,
3818                 .rpc_cred = cred,
3819         };
3820         unsigned long now;
3821         int status;
3822
3823         now = jiffies;
3824         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3825         if (status == 0) {
3826                 spin_lock(&clp->cl_lock);
3827                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3828                 clp->cl_last_renewal = now;
3829                 spin_unlock(&clp->cl_lock);
3830         }
3831         return status;
3832 }
3833
3834 struct nfs4_delegreturndata {
3835         struct nfs4_delegreturnargs args;
3836         struct nfs4_delegreturnres res;
3837         struct nfs_fh fh;
3838         nfs4_stateid stateid;
3839         unsigned long timestamp;
3840         struct nfs_fattr fattr;
3841         int rpc_status;
3842 };
3843
3844 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3845 {
3846         struct nfs4_delegreturndata *data = calldata;
3847
3848         if (!nfs4_sequence_done(task, &data->res.seq_res))
3849                 return;
3850
3851         switch (task->tk_status) {
3852         case -NFS4ERR_STALE_STATEID:
3853         case -NFS4ERR_EXPIRED:
3854         case 0:
3855                 renew_lease(data->res.server, data->timestamp);
3856                 break;
3857         default:
3858                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3859                                 -EAGAIN) {
3860                         nfs_restart_rpc(task, data->res.server->nfs_client);
3861                         return;
3862                 }
3863         }
3864         data->rpc_status = task->tk_status;
3865 }
3866
3867 static void nfs4_delegreturn_release(void *calldata)
3868 {
3869         kfree(calldata);
3870 }
3871
3872 #if defined(CONFIG_NFS_V4_1)
3873 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3874 {
3875         struct nfs4_delegreturndata *d_data;
3876
3877         d_data = (struct nfs4_delegreturndata *)data;
3878
3879         if (nfs4_setup_sequence(d_data->res.server,
3880                                 &d_data->args.seq_args,
3881                                 &d_data->res.seq_res, 1, task))
3882                 return;
3883         rpc_call_start(task);
3884 }
3885 #endif /* CONFIG_NFS_V4_1 */
3886
3887 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3888 #if defined(CONFIG_NFS_V4_1)
3889         .rpc_call_prepare = nfs4_delegreturn_prepare,
3890 #endif /* CONFIG_NFS_V4_1 */
3891         .rpc_call_done = nfs4_delegreturn_done,
3892         .rpc_release = nfs4_delegreturn_release,
3893 };
3894
3895 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3896 {
3897         struct nfs4_delegreturndata *data;
3898         struct nfs_server *server = NFS_SERVER(inode);
3899         struct rpc_task *task;
3900         struct rpc_message msg = {
3901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3902                 .rpc_cred = cred,
3903         };
3904         struct rpc_task_setup task_setup_data = {
3905                 .rpc_client = server->client,
3906                 .rpc_message = &msg,
3907                 .callback_ops = &nfs4_delegreturn_ops,
3908                 .flags = RPC_TASK_ASYNC,
3909         };
3910         int status = 0;
3911
3912         data = kzalloc(sizeof(*data), GFP_NOFS);
3913         if (data == NULL)
3914                 return -ENOMEM;
3915         data->args.fhandle = &data->fh;
3916         data->args.stateid = &data->stateid;
3917         data->args.bitmask = server->attr_bitmask;
3918         nfs_copy_fh(&data->fh, NFS_FH(inode));
3919         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3920         data->res.fattr = &data->fattr;
3921         data->res.server = server;
3922         nfs_fattr_init(data->res.fattr);
3923         data->timestamp = jiffies;
3924         data->rpc_status = 0;
3925
3926         task_setup_data.callback_data = data;
3927         msg.rpc_argp = &data->args;
3928         msg.rpc_resp = &data->res;
3929         task = rpc_run_task(&task_setup_data);
3930         if (IS_ERR(task))
3931                 return PTR_ERR(task);
3932         if (!issync)
3933                 goto out;
3934         status = nfs4_wait_for_completion_rpc_task(task);
3935         if (status != 0)
3936                 goto out;
3937         status = data->rpc_status;
3938         if (status != 0)
3939                 goto out;
3940         nfs_refresh_inode(inode, &data->fattr);
3941 out:
3942         rpc_put_task(task);
3943         return status;
3944 }
3945
3946 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3947 {
3948         struct nfs_server *server = NFS_SERVER(inode);
3949         struct nfs4_exception exception = { };
3950         int err;
3951         do {
3952                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3953                 switch (err) {
3954                         case -NFS4ERR_STALE_STATEID:
3955                         case -NFS4ERR_EXPIRED:
3956                         case 0:
3957                                 return 0;
3958                 }
3959                 err = nfs4_handle_exception(server, err, &exception);
3960         } while (exception.retry);
3961         return err;
3962 }
3963
3964 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3965 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3966
3967 /*
3968  * sleep, with exponential backoff, and retry the LOCK operation.
3969  */
3970 static unsigned long
3971 nfs4_set_lock_task_retry(unsigned long timeout)
3972 {
3973         schedule_timeout_killable(timeout);
3974         timeout <<= 1;
3975         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3976                 return NFS4_LOCK_MAXTIMEOUT;
3977         return timeout;
3978 }
3979
3980 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3981 {
3982         struct inode *inode = state->inode;
3983         struct nfs_server *server = NFS_SERVER(inode);
3984         struct nfs_client *clp = server->nfs_client;
3985         struct nfs_lockt_args arg = {
3986                 .fh = NFS_FH(inode),
3987                 .fl = request,
3988         };
3989         struct nfs_lockt_res res = {
3990                 .denied = request,
3991         };
3992         struct rpc_message msg = {
3993                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3994                 .rpc_argp       = &arg,
3995                 .rpc_resp       = &res,
3996                 .rpc_cred       = state->owner->so_cred,
3997         };
3998         struct nfs4_lock_state *lsp;
3999         int status;
4000
4001         arg.lock_owner.clientid = clp->cl_clientid;
4002         status = nfs4_set_lock_state(state, request);
4003         if (status != 0)
4004                 goto out;
4005         lsp = request->fl_u.nfs4_fl.owner;
4006         arg.lock_owner.id = lsp->ls_id.id;
4007         arg.lock_owner.s_dev = server->s_dev;
4008         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4009         switch (status) {
4010                 case 0:
4011                         request->fl_type = F_UNLCK;
4012                         break;
4013                 case -NFS4ERR_DENIED:
4014                         status = 0;
4015         }
4016         request->fl_ops->fl_release_private(request);
4017 out:
4018         return status;
4019 }
4020
4021 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4022 {
4023         struct nfs4_exception exception = { };
4024         int err;
4025
4026         do {
4027                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4028                                 _nfs4_proc_getlk(state, cmd, request),
4029                                 &exception);
4030         } while (exception.retry);
4031         return err;
4032 }
4033
4034 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4035 {
4036         int res = 0;
4037         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4038                 case FL_POSIX:
4039                         res = posix_lock_file_wait(file, fl);
4040                         break;
4041                 case FL_FLOCK:
4042                         res = flock_lock_file_wait(file, fl);
4043                         break;
4044                 default:
4045                         BUG();
4046         }
4047         return res;
4048 }
4049
4050 struct nfs4_unlockdata {
4051         struct nfs_locku_args arg;
4052         struct nfs_locku_res res;
4053         struct nfs4_lock_state *lsp;
4054         struct nfs_open_context *ctx;
4055         struct file_lock fl;
4056         const struct nfs_server *server;
4057         unsigned long timestamp;
4058 };
4059
4060 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4061                 struct nfs_open_context *ctx,
4062                 struct nfs4_lock_state *lsp,
4063                 struct nfs_seqid *seqid)
4064 {
4065         struct nfs4_unlockdata *p;
4066         struct inode *inode = lsp->ls_state->inode;
4067
4068         p = kzalloc(sizeof(*p), GFP_NOFS);
4069         if (p == NULL)
4070                 return NULL;
4071         p->arg.fh = NFS_FH(inode);
4072         p->arg.fl = &p->fl;
4073         p->arg.seqid = seqid;
4074         p->res.seqid = seqid;
4075         p->arg.stateid = &lsp->ls_stateid;
4076         p->lsp = lsp;
4077         atomic_inc(&lsp->ls_count);
4078         /* Ensure we don't close file until we're done freeing locks! */
4079         p->ctx = get_nfs_open_context(ctx);
4080         memcpy(&p->fl, fl, sizeof(p->fl));
4081         p->server = NFS_SERVER(inode);
4082         return p;
4083 }
4084
4085 static void nfs4_locku_release_calldata(void *data)
4086 {
4087         struct nfs4_unlockdata *calldata = data;
4088         nfs_free_seqid(calldata->arg.seqid);
4089         nfs4_put_lock_state(calldata->lsp);
4090         put_nfs_open_context(calldata->ctx);
4091         kfree(calldata);
4092 }
4093
4094 static void nfs4_locku_done(struct rpc_task *task, void *data)
4095 {
4096         struct nfs4_unlockdata *calldata = data;
4097
4098         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4099                 return;
4100         switch (task->tk_status) {
4101                 case 0:
4102                         memcpy(calldata->lsp->ls_stateid.data,
4103                                         calldata->res.stateid.data,
4104                                         sizeof(calldata->lsp->ls_stateid.data));
4105                         renew_lease(calldata->server, calldata->timestamp);
4106                         break;
4107                 case -NFS4ERR_BAD_STATEID:
4108                 case -NFS4ERR_OLD_STATEID:
4109                 case -NFS4ERR_STALE_STATEID:
4110                 case -NFS4ERR_EXPIRED:
4111                         break;
4112                 default:
4113                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4114                                 nfs_restart_rpc(task,
4115                                                  calldata->server->nfs_client);
4116         }
4117 }
4118
4119 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4120 {
4121         struct nfs4_unlockdata *calldata = data;
4122
4123         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4124                 return;
4125         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4126                 /* Note: exit _without_ running nfs4_locku_done */
4127                 task->tk_action = NULL;
4128                 return;
4129         }
4130         calldata->timestamp = jiffies;
4131         if (nfs4_setup_sequence(calldata->server,
4132                                 &calldata->arg.seq_args,
4133                                 &calldata->res.seq_res, 1, task))
4134                 return;
4135         rpc_call_start(task);
4136 }
4137
4138 static const struct rpc_call_ops nfs4_locku_ops = {
4139         .rpc_call_prepare = nfs4_locku_prepare,
4140         .rpc_call_done = nfs4_locku_done,
4141         .rpc_release = nfs4_locku_release_calldata,
4142 };
4143
4144 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4145                 struct nfs_open_context *ctx,
4146                 struct nfs4_lock_state *lsp,
4147                 struct nfs_seqid *seqid)
4148 {
4149         struct nfs4_unlockdata *data;
4150         struct rpc_message msg = {
4151                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4152                 .rpc_cred = ctx->cred,
4153         };
4154         struct rpc_task_setup task_setup_data = {
4155                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4156                 .rpc_message = &msg,
4157                 .callback_ops = &nfs4_locku_ops,
4158                 .workqueue = nfsiod_workqueue,
4159                 .flags = RPC_TASK_ASYNC,
4160         };
4161
4162         /* Ensure this is an unlock - when canceling a lock, the
4163          * canceled lock is passed in, and it won't be an unlock.
4164          */
4165         fl->fl_type = F_UNLCK;
4166
4167         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4168         if (data == NULL) {
4169                 nfs_free_seqid(seqid);
4170                 return ERR_PTR(-ENOMEM);
4171         }
4172
4173         msg.rpc_argp = &data->arg;
4174         msg.rpc_resp = &data->res;
4175         task_setup_data.callback_data = data;
4176         return rpc_run_task(&task_setup_data);
4177 }
4178
4179 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4180 {
4181         struct nfs_inode *nfsi = NFS_I(state->inode);
4182         struct nfs_seqid *seqid;
4183         struct nfs4_lock_state *lsp;
4184         struct rpc_task *task;
4185         int status = 0;
4186         unsigned char fl_flags = request->fl_flags;
4187
4188         status = nfs4_set_lock_state(state, request);
4189         /* Unlock _before_ we do the RPC call */
4190         request->fl_flags |= FL_EXISTS;
4191         down_read(&nfsi->rwsem);
4192         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4193                 up_read(&nfsi->rwsem);
4194                 goto out;
4195         }
4196         up_read(&nfsi->rwsem);
4197         if (status != 0)
4198                 goto out;
4199         /* Is this a delegated lock? */
4200         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4201                 goto out;
4202         lsp = request->fl_u.nfs4_fl.owner;
4203         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4204         status = -ENOMEM;
4205         if (seqid == NULL)
4206                 goto out;
4207         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4208         status = PTR_ERR(task);
4209         if (IS_ERR(task))
4210                 goto out;
4211         status = nfs4_wait_for_completion_rpc_task(task);
4212         rpc_put_task(task);
4213 out:
4214         request->fl_flags = fl_flags;
4215         return status;
4216 }
4217
4218 struct nfs4_lockdata {
4219         struct nfs_lock_args arg;
4220         struct nfs_lock_res res;
4221         struct nfs4_lock_state *lsp;
4222         struct nfs_open_context *ctx;
4223         struct file_lock fl;
4224         unsigned long timestamp;
4225         int rpc_status;
4226         int cancelled;
4227         struct nfs_server *server;
4228 };
4229
4230 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4231                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4232                 gfp_t gfp_mask)
4233 {
4234         struct nfs4_lockdata *p;
4235         struct inode *inode = lsp->ls_state->inode;
4236         struct nfs_server *server = NFS_SERVER(inode);
4237
4238         p = kzalloc(sizeof(*p), gfp_mask);
4239         if (p == NULL)
4240                 return NULL;
4241
4242         p->arg.fh = NFS_FH(inode);
4243         p->arg.fl = &p->fl;
4244         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4245         if (p->arg.open_seqid == NULL)
4246                 goto out_free;
4247         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4248         if (p->arg.lock_seqid == NULL)
4249                 goto out_free_seqid;
4250         p->arg.lock_stateid = &lsp->ls_stateid;
4251         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4252         p->arg.lock_owner.id = lsp->ls_id.id;
4253         p->arg.lock_owner.s_dev = server->s_dev;
4254         p->res.lock_seqid = p->arg.lock_seqid;
4255         p->lsp = lsp;
4256         p->server = server;
4257         atomic_inc(&lsp->ls_count);
4258         p->ctx = get_nfs_open_context(ctx);
4259         memcpy(&p->fl, fl, sizeof(p->fl));
4260         return p;
4261 out_free_seqid:
4262         nfs_free_seqid(p->arg.open_seqid);
4263 out_free:
4264         kfree(p);
4265         return NULL;
4266 }
4267
4268 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4269 {
4270         struct nfs4_lockdata *data = calldata;
4271         struct nfs4_state *state = data->lsp->ls_state;
4272
4273         dprintk("%s: begin!\n", __func__);
4274         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4275                 return;
4276         /* Do we need to do an open_to_lock_owner? */
4277         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4278                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4279                         return;
4280                 data->arg.open_stateid = &state->stateid;
4281                 data->arg.new_lock_owner = 1;
4282                 data->res.open_seqid = data->arg.open_seqid;
4283         } else
4284                 data->arg.new_lock_owner = 0;
4285         data->timestamp = jiffies;
4286         if (nfs4_setup_sequence(data->server,
4287                                 &data->arg.seq_args,
4288                                 &data->res.seq_res, 1, task))
4289                 return;
4290         rpc_call_start(task);
4291         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4292 }
4293
4294 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4295 {
4296         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4297         nfs4_lock_prepare(task, calldata);
4298 }
4299
4300 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4301 {
4302         struct nfs4_lockdata *data = calldata;
4303
4304         dprintk("%s: begin!\n", __func__);
4305
4306         if (!nfs4_sequence_done(task, &data->res.seq_res))
4307                 return;
4308
4309         data->rpc_status = task->tk_status;
4310         if (data->arg.new_lock_owner != 0) {
4311                 if (data->rpc_status == 0)
4312                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4313                 else
4314                         goto out;
4315         }
4316         if (data->rpc_status == 0) {
4317                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4318                                         sizeof(data->lsp->ls_stateid.data));
4319                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4320                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4321         }
4322 out:
4323         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4324 }
4325
4326 static void nfs4_lock_release(void *calldata)
4327 {
4328         struct nfs4_lockdata *data = calldata;
4329
4330         dprintk("%s: begin!\n", __func__);
4331         nfs_free_seqid(data->arg.open_seqid);
4332         if (data->cancelled != 0) {
4333                 struct rpc_task *task;
4334                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4335                                 data->arg.lock_seqid);
4336                 if (!IS_ERR(task))
4337                         rpc_put_task_async(task);
4338                 dprintk("%s: cancelling lock!\n", __func__);
4339         } else
4340                 nfs_free_seqid(data->arg.lock_seqid);
4341         nfs4_put_lock_state(data->lsp);
4342         put_nfs_open_context(data->ctx);
4343         kfree(data);
4344         dprintk("%s: done!\n", __func__);
4345 }
4346
4347 static const struct rpc_call_ops nfs4_lock_ops = {
4348         .rpc_call_prepare = nfs4_lock_prepare,
4349         .rpc_call_done = nfs4_lock_done,
4350         .rpc_release = nfs4_lock_release,
4351 };
4352
4353 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4354         .rpc_call_prepare = nfs4_recover_lock_prepare,
4355         .rpc_call_done = nfs4_lock_done,
4356         .rpc_release = nfs4_lock_release,
4357 };
4358
4359 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4360 {
4361         switch (error) {
4362         case -NFS4ERR_ADMIN_REVOKED:
4363         case -NFS4ERR_BAD_STATEID:
4364                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4365                 if (new_lock_owner != 0 ||
4366                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4367                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4368                 break;
4369         case -NFS4ERR_STALE_STATEID:
4370                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4371         case -NFS4ERR_EXPIRED:
4372                 nfs4_schedule_lease_recovery(server->nfs_client);
4373         };
4374 }
4375
4376 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4377 {
4378         struct nfs4_lockdata *data;
4379         struct rpc_task *task;
4380         struct rpc_message msg = {
4381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4382                 .rpc_cred = state->owner->so_cred,
4383         };
4384         struct rpc_task_setup task_setup_data = {
4385                 .rpc_client = NFS_CLIENT(state->inode),
4386                 .rpc_message = &msg,
4387                 .callback_ops = &nfs4_lock_ops,
4388                 .workqueue = nfsiod_workqueue,
4389                 .flags = RPC_TASK_ASYNC,
4390         };
4391         int ret;
4392
4393         dprintk("%s: begin!\n", __func__);
4394         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4395                         fl->fl_u.nfs4_fl.owner,
4396                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4397         if (data == NULL)
4398                 return -ENOMEM;
4399         if (IS_SETLKW(cmd))
4400                 data->arg.block = 1;
4401         if (recovery_type > NFS_LOCK_NEW) {
4402                 if (recovery_type == NFS_LOCK_RECLAIM)
4403                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4404                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4405         }
4406         msg.rpc_argp = &data->arg;
4407         msg.rpc_resp = &data->res;
4408         task_setup_data.callback_data = data;
4409         task = rpc_run_task(&task_setup_data);
4410         if (IS_ERR(task))
4411                 return PTR_ERR(task);
4412         ret = nfs4_wait_for_completion_rpc_task(task);
4413         if (ret == 0) {
4414                 ret = data->rpc_status;
4415                 if (ret)
4416                         nfs4_handle_setlk_error(data->server, data->lsp,
4417                                         data->arg.new_lock_owner, ret);
4418         } else
4419                 data->cancelled = 1;
4420         rpc_put_task(task);
4421         dprintk("%s: done, ret = %d!\n", __func__, ret);
4422         return ret;
4423 }
4424
4425 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4426 {
4427         struct nfs_server *server = NFS_SERVER(state->inode);
4428         struct nfs4_exception exception = { };
4429         int err;
4430
4431         do {
4432                 /* Cache the lock if possible... */
4433                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4434                         return 0;
4435                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4436                 if (err != -NFS4ERR_DELAY)
4437                         break;
4438                 nfs4_handle_exception(server, err, &exception);
4439         } while (exception.retry);
4440         return err;
4441 }
4442
4443 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4444 {
4445         struct nfs_server *server = NFS_SERVER(state->inode);
4446         struct nfs4_exception exception = { };
4447         int err;
4448
4449         err = nfs4_set_lock_state(state, request);
4450         if (err != 0)
4451                 return err;
4452         do {
4453                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4454                         return 0;
4455                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4456                 switch (err) {
4457                 default:
4458                         goto out;
4459                 case -NFS4ERR_GRACE:
4460                 case -NFS4ERR_DELAY:
4461                         nfs4_handle_exception(server, err, &exception);
4462                         err = 0;
4463                 }
4464         } while (exception.retry);
4465 out:
4466         return err;
4467 }
4468
4469 #if defined(CONFIG_NFS_V4_1)
4470 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4471 {
4472         int status;
4473         struct nfs_server *server = NFS_SERVER(state->inode);
4474
4475         status = nfs41_test_stateid(server, state);
4476         if (status == NFS_OK)
4477                 return 0;
4478         nfs41_free_stateid(server, state);
4479         return nfs4_lock_expired(state, request);
4480 }
4481 #endif
4482
4483 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4484 {
4485         struct nfs_inode *nfsi = NFS_I(state->inode);
4486         unsigned char fl_flags = request->fl_flags;
4487         int status = -ENOLCK;
4488
4489         if ((fl_flags & FL_POSIX) &&
4490                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4491                 goto out;
4492         /* Is this a delegated open? */
4493         status = nfs4_set_lock_state(state, request);
4494         if (status != 0)
4495                 goto out;
4496         request->fl_flags |= FL_ACCESS;
4497         status = do_vfs_lock(request->fl_file, request);
4498         if (status < 0)
4499                 goto out;
4500         down_read(&nfsi->rwsem);
4501         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4502                 /* Yes: cache locks! */
4503                 /* ...but avoid races with delegation recall... */
4504                 request->fl_flags = fl_flags & ~FL_SLEEP;
4505                 status = do_vfs_lock(request->fl_file, request);
4506                 goto out_unlock;
4507         }
4508         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4509         if (status != 0)
4510                 goto out_unlock;
4511         /* Note: we always want to sleep here! */
4512         request->fl_flags = fl_flags | FL_SLEEP;
4513         if (do_vfs_lock(request->fl_file, request) < 0)
4514                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4515 out_unlock:
4516         up_read(&nfsi->rwsem);
4517 out:
4518         request->fl_flags = fl_flags;
4519         return status;
4520 }
4521
4522 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4523 {
4524         struct nfs4_exception exception = { };
4525         int err;
4526
4527         do {
4528                 err = _nfs4_proc_setlk(state, cmd, request);
4529                 if (err == -NFS4ERR_DENIED)
4530                         err = -EAGAIN;
4531                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4532                                 err, &exception);
4533         } while (exception.retry);
4534         return err;
4535 }
4536
4537 static int
4538 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4539 {
4540         struct nfs_open_context *ctx;
4541         struct nfs4_state *state;
4542         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4543         int status;
4544
4545         /* verify open state */
4546         ctx = nfs_file_open_context(filp);
4547         state = ctx->state;
4548
4549         if (request->fl_start < 0 || request->fl_end < 0)
4550                 return -EINVAL;
4551
4552         if (IS_GETLK(cmd)) {
4553                 if (state != NULL)
4554                         return nfs4_proc_getlk(state, F_GETLK, request);
4555                 return 0;
4556         }
4557
4558         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4559                 return -EINVAL;
4560
4561         if (request->fl_type == F_UNLCK) {
4562                 if (state != NULL)
4563                         return nfs4_proc_unlck(state, cmd, request);
4564                 return 0;
4565         }
4566
4567         if (state == NULL)
4568                 return -ENOLCK;
4569         do {
4570                 status = nfs4_proc_setlk(state, cmd, request);
4571                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4572                         break;
4573                 timeout = nfs4_set_lock_task_retry(timeout);
4574                 status = -ERESTARTSYS;
4575                 if (signalled())
4576                         break;
4577         } while(status < 0);
4578         return status;
4579 }
4580
4581 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4582 {
4583         struct nfs_server *server = NFS_SERVER(state->inode);
4584         struct nfs4_exception exception = { };
4585         int err;
4586
4587         err = nfs4_set_lock_state(state, fl);
4588         if (err != 0)
4589                 goto out;
4590         do {
4591                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4592                 switch (err) {
4593                         default:
4594                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4595                                                 __func__, err);
4596                         case 0:
4597                         case -ESTALE:
4598                                 goto out;
4599                         case -NFS4ERR_EXPIRED:
4600                                 nfs4_schedule_stateid_recovery(server, state);
4601                         case -NFS4ERR_STALE_CLIENTID:
4602                         case -NFS4ERR_STALE_STATEID:
4603                                 nfs4_schedule_lease_recovery(server->nfs_client);
4604                                 goto out;
4605                         case -NFS4ERR_BADSESSION:
4606                         case -NFS4ERR_BADSLOT:
4607                         case -NFS4ERR_BAD_HIGH_SLOT:
4608                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4609                         case -NFS4ERR_DEADSESSION:
4610                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4611                                 goto out;
4612                         case -ERESTARTSYS:
4613                                 /*
4614                                  * The show must go on: exit, but mark the
4615                                  * stateid as needing recovery.
4616                                  */
4617                         case -NFS4ERR_ADMIN_REVOKED:
4618                         case -NFS4ERR_BAD_STATEID:
4619                         case -NFS4ERR_OPENMODE:
4620                                 nfs4_schedule_stateid_recovery(server, state);
4621                                 err = 0;
4622                                 goto out;
4623                         case -EKEYEXPIRED:
4624                                 /*
4625                                  * User RPCSEC_GSS context has expired.
4626                                  * We cannot recover this stateid now, so
4627                                  * skip it and allow recovery thread to
4628                                  * proceed.
4629                                  */
4630                                 err = 0;
4631                                 goto out;
4632                         case -ENOMEM:
4633                         case -NFS4ERR_DENIED:
4634                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4635                                 err = 0;
4636                                 goto out;
4637                         case -NFS4ERR_DELAY:
4638                                 break;
4639                 }
4640                 err = nfs4_handle_exception(server, err, &exception);
4641         } while (exception.retry);
4642 out:
4643         return err;
4644 }
4645
4646 static void nfs4_release_lockowner_release(void *calldata)
4647 {
4648         kfree(calldata);
4649 }
4650
4651 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4652         .rpc_release = nfs4_release_lockowner_release,
4653 };
4654
4655 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4656 {
4657         struct nfs_server *server = lsp->ls_state->owner->so_server;
4658         struct nfs_release_lockowner_args *args;
4659         struct rpc_message msg = {
4660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4661         };
4662
4663         if (server->nfs_client->cl_mvops->minor_version != 0)
4664                 return;
4665         args = kmalloc(sizeof(*args), GFP_NOFS);
4666         if (!args)
4667                 return;
4668         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4669         args->lock_owner.id = lsp->ls_id.id;
4670         args->lock_owner.s_dev = server->s_dev;
4671         msg.rpc_argp = args;
4672         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4673 }
4674
4675 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4676
4677 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4678                                    const void *buf, size_t buflen,
4679                                    int flags, int type)
4680 {
4681         if (strcmp(key, "") != 0)
4682                 return -EINVAL;
4683
4684         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4685 }
4686
4687 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4688                                    void *buf, size_t buflen, int type)
4689 {
4690         if (strcmp(key, "") != 0)
4691                 return -EINVAL;
4692
4693         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4694 }
4695
4696 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4697                                        size_t list_len, const char *name,
4698                                        size_t name_len, int type)
4699 {
4700         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4701
4702         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4703                 return 0;
4704
4705         if (list && len <= list_len)
4706                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4707         return len;
4708 }
4709
4710 /*
4711  * nfs_fhget will use either the mounted_on_fileid or the fileid
4712  */
4713 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4714 {
4715         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4716                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4717               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4718               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4719                 return;
4720
4721         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4722                 NFS_ATTR_FATTR_NLINK;
4723         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4724         fattr->nlink = 2;
4725 }
4726
4727 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4728                 struct nfs4_fs_locations *fs_locations, struct page *page)
4729 {
4730         struct nfs_server *server = NFS_SERVER(dir);
4731         u32 bitmask[2] = {
4732                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4733         };
4734         struct nfs4_fs_locations_arg args = {
4735                 .dir_fh = NFS_FH(dir),
4736                 .name = name,
4737                 .page = page,
4738                 .bitmask = bitmask,
4739         };
4740         struct nfs4_fs_locations_res res = {
4741                 .fs_locations = fs_locations,
4742         };
4743         struct rpc_message msg = {
4744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4745                 .rpc_argp = &args,
4746                 .rpc_resp = &res,
4747         };
4748         int status;
4749
4750         dprintk("%s: start\n", __func__);
4751
4752         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4753          * is not supported */
4754         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4755                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4756         else
4757                 bitmask[0] |= FATTR4_WORD0_FILEID;
4758
4759         nfs_fattr_init(&fs_locations->fattr);
4760         fs_locations->server = server;
4761         fs_locations->nlocations = 0;
4762         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4763         dprintk("%s: returned status = %d\n", __func__, status);
4764         return status;
4765 }
4766
4767 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4768 {
4769         int status;
4770         struct nfs4_secinfo_arg args = {
4771                 .dir_fh = NFS_FH(dir),
4772                 .name   = name,
4773         };
4774         struct nfs4_secinfo_res res = {
4775                 .flavors     = flavors,
4776         };
4777         struct rpc_message msg = {
4778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4779                 .rpc_argp = &args,
4780                 .rpc_resp = &res,
4781         };
4782
4783         dprintk("NFS call  secinfo %s\n", name->name);
4784         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4785         dprintk("NFS reply  secinfo: %d\n", status);
4786         return status;
4787 }
4788
4789 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4790 {
4791         struct nfs4_exception exception = { };
4792         int err;
4793         do {
4794                 err = nfs4_handle_exception(NFS_SERVER(dir),
4795                                 _nfs4_proc_secinfo(dir, name, flavors),
4796                                 &exception);
4797         } while (exception.retry);
4798         return err;
4799 }
4800
4801 #ifdef CONFIG_NFS_V4_1
4802 /*
4803  * Check the exchange flags returned by the server for invalid flags, having
4804  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4805  * DS flags set.
4806  */
4807 static int nfs4_check_cl_exchange_flags(u32 flags)
4808 {
4809         if (flags & ~EXCHGID4_FLAG_MASK_R)
4810                 goto out_inval;
4811         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4812             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4813                 goto out_inval;
4814         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4815                 goto out_inval;
4816         return NFS_OK;
4817 out_inval:
4818         return -NFS4ERR_INVAL;
4819 }
4820
4821 static bool
4822 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4823 {
4824         if (a->server_scope_sz == b->server_scope_sz &&
4825             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4826                 return true;
4827
4828         return false;
4829 }
4830
4831 /*
4832  * nfs4_proc_exchange_id()
4833  *
4834  * Since the clientid has expired, all compounds using sessions
4835  * associated with the stale clientid will be returning
4836  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4837  * be in some phase of session reset.
4838  */
4839 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4840 {
4841         nfs4_verifier verifier;
4842         struct nfs41_exchange_id_args args = {
4843                 .client = clp,
4844                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4845         };
4846         struct nfs41_exchange_id_res res = {
4847                 .client = clp,
4848         };
4849         int status;
4850         struct rpc_message msg = {
4851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4852                 .rpc_argp = &args,
4853                 .rpc_resp = &res,
4854                 .rpc_cred = cred,
4855         };
4856         __be32 *p;
4857
4858         dprintk("--> %s\n", __func__);
4859         BUG_ON(clp == NULL);
4860
4861         p = (u32 *)verifier.data;
4862         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4863         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4864         args.verifier = &verifier;
4865
4866         args.id_len = scnprintf(args.id, sizeof(args.id),
4867                                 "%s/%s.%s/%u",
4868                                 clp->cl_ipaddr,
4869                                 init_utsname()->nodename,
4870                                 init_utsname()->domainname,
4871                                 clp->cl_rpcclient->cl_auth->au_flavor);
4872
4873         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4874         if (unlikely(!res.server_scope))
4875                 return -ENOMEM;
4876
4877         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4878         if (!status)
4879                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4880
4881         if (!status) {
4882                 if (clp->server_scope &&
4883                     !nfs41_same_server_scope(clp->server_scope,
4884                                              res.server_scope)) {
4885                         dprintk("%s: server_scope mismatch detected\n",
4886                                 __func__);
4887                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4888                         kfree(clp->server_scope);
4889                         clp->server_scope = NULL;
4890                 }
4891
4892                 if (!clp->server_scope)
4893                         clp->server_scope = res.server_scope;
4894                 else
4895                         kfree(res.server_scope);
4896         }
4897
4898         dprintk("<-- %s status= %d\n", __func__, status);
4899         return status;
4900 }
4901
4902 struct nfs4_get_lease_time_data {
4903         struct nfs4_get_lease_time_args *args;
4904         struct nfs4_get_lease_time_res *res;
4905         struct nfs_client *clp;
4906 };
4907
4908 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4909                                         void *calldata)
4910 {
4911         int ret;
4912         struct nfs4_get_lease_time_data *data =
4913                         (struct nfs4_get_lease_time_data *)calldata;
4914
4915         dprintk("--> %s\n", __func__);
4916         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4917         /* just setup sequence, do not trigger session recovery
4918            since we're invoked within one */
4919         ret = nfs41_setup_sequence(data->clp->cl_session,
4920                                    &data->args->la_seq_args,
4921                                    &data->res->lr_seq_res, 0, task);
4922
4923         BUG_ON(ret == -EAGAIN);
4924         rpc_call_start(task);
4925         dprintk("<-- %s\n", __func__);
4926 }
4927
4928 /*
4929  * Called from nfs4_state_manager thread for session setup, so don't recover
4930  * from sequence operation or clientid errors.
4931  */
4932 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4933 {
4934         struct nfs4_get_lease_time_data *data =
4935                         (struct nfs4_get_lease_time_data *)calldata;
4936
4937         dprintk("--> %s\n", __func__);
4938         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4939                 return;
4940         switch (task->tk_status) {
4941         case -NFS4ERR_DELAY:
4942         case -NFS4ERR_GRACE:
4943                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4944                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4945                 task->tk_status = 0;
4946                 /* fall through */
4947         case -NFS4ERR_RETRY_UNCACHED_REP:
4948                 nfs_restart_rpc(task, data->clp);
4949                 return;
4950         }
4951         dprintk("<-- %s\n", __func__);
4952 }
4953
4954 struct rpc_call_ops nfs4_get_lease_time_ops = {
4955         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4956         .rpc_call_done = nfs4_get_lease_time_done,
4957 };
4958
4959 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4960 {
4961         struct rpc_task *task;
4962         struct nfs4_get_lease_time_args args;
4963         struct nfs4_get_lease_time_res res = {
4964                 .lr_fsinfo = fsinfo,
4965         };
4966         struct nfs4_get_lease_time_data data = {
4967                 .args = &args,
4968                 .res = &res,
4969                 .clp = clp,
4970         };
4971         struct rpc_message msg = {
4972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4973                 .rpc_argp = &args,
4974                 .rpc_resp = &res,
4975         };
4976         struct rpc_task_setup task_setup = {
4977                 .rpc_client = clp->cl_rpcclient,
4978                 .rpc_message = &msg,
4979                 .callback_ops = &nfs4_get_lease_time_ops,
4980                 .callback_data = &data,
4981                 .flags = RPC_TASK_TIMEOUT,
4982         };
4983         int status;
4984
4985         dprintk("--> %s\n", __func__);
4986         task = rpc_run_task(&task_setup);
4987
4988         if (IS_ERR(task))
4989                 status = PTR_ERR(task);
4990         else {
4991                 status = task->tk_status;
4992                 rpc_put_task(task);
4993         }
4994         dprintk("<-- %s return %d\n", __func__, status);
4995
4996         return status;
4997 }
4998
4999 /*
5000  * Reset a slot table
5001  */
5002 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5003                                  int ivalue)
5004 {
5005         struct nfs4_slot *new = NULL;
5006         int i;
5007         int ret = 0;
5008
5009         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5010                 max_reqs, tbl->max_slots);
5011
5012         /* Does the newly negotiated max_reqs match the existing slot table? */
5013         if (max_reqs != tbl->max_slots) {
5014                 ret = -ENOMEM;
5015                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5016                               GFP_NOFS);
5017                 if (!new)
5018                         goto out;
5019                 ret = 0;
5020                 kfree(tbl->slots);
5021         }
5022         spin_lock(&tbl->slot_tbl_lock);
5023         if (new) {
5024                 tbl->slots = new;
5025                 tbl->max_slots = max_reqs;
5026         }
5027         for (i = 0; i < tbl->max_slots; ++i)
5028                 tbl->slots[i].seq_nr = ivalue;
5029         spin_unlock(&tbl->slot_tbl_lock);
5030         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5031                 tbl, tbl->slots, tbl->max_slots);
5032 out:
5033         dprintk("<-- %s: return %d\n", __func__, ret);
5034         return ret;
5035 }
5036
5037 /*
5038  * Reset the forechannel and backchannel slot tables
5039  */
5040 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5041 {
5042         int status;
5043
5044         status = nfs4_reset_slot_table(&session->fc_slot_table,
5045                         session->fc_attrs.max_reqs, 1);
5046         if (status)
5047                 return status;
5048
5049         status = nfs4_reset_slot_table(&session->bc_slot_table,
5050                         session->bc_attrs.max_reqs, 0);
5051         return status;
5052 }
5053
5054 /* Destroy the slot table */
5055 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5056 {
5057         if (session->fc_slot_table.slots != NULL) {
5058                 kfree(session->fc_slot_table.slots);
5059                 session->fc_slot_table.slots = NULL;
5060         }
5061         if (session->bc_slot_table.slots != NULL) {
5062                 kfree(session->bc_slot_table.slots);
5063                 session->bc_slot_table.slots = NULL;
5064         }
5065         return;
5066 }
5067
5068 /*
5069  * Initialize slot table
5070  */
5071 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5072                 int max_slots, int ivalue)
5073 {
5074         struct nfs4_slot *slot;
5075         int ret = -ENOMEM;
5076
5077         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5078
5079         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5080
5081         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5082         if (!slot)
5083                 goto out;
5084         ret = 0;
5085
5086         spin_lock(&tbl->slot_tbl_lock);
5087         tbl->max_slots = max_slots;
5088         tbl->slots = slot;
5089         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5090         spin_unlock(&tbl->slot_tbl_lock);
5091         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5092                 tbl, tbl->slots, tbl->max_slots);
5093 out:
5094         dprintk("<-- %s: return %d\n", __func__, ret);
5095         return ret;
5096 }
5097
5098 /*
5099  * Initialize the forechannel and backchannel tables
5100  */
5101 static int nfs4_init_slot_tables(struct nfs4_session *session)
5102 {
5103         struct nfs4_slot_table *tbl;
5104         int status = 0;
5105
5106         tbl = &session->fc_slot_table;
5107         if (tbl->slots == NULL) {
5108                 status = nfs4_init_slot_table(tbl,
5109                                 session->fc_attrs.max_reqs, 1);
5110                 if (status)
5111                         return status;
5112         }
5113
5114         tbl = &session->bc_slot_table;
5115         if (tbl->slots == NULL) {
5116                 status = nfs4_init_slot_table(tbl,
5117                                 session->bc_attrs.max_reqs, 0);
5118                 if (status)
5119                         nfs4_destroy_slot_tables(session);
5120         }
5121
5122         return status;
5123 }
5124
5125 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5126 {
5127         struct nfs4_session *session;
5128         struct nfs4_slot_table *tbl;
5129
5130         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5131         if (!session)
5132                 return NULL;
5133
5134         tbl = &session->fc_slot_table;
5135         tbl->highest_used_slotid = -1;
5136         spin_lock_init(&tbl->slot_tbl_lock);
5137         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5138         init_completion(&tbl->complete);
5139
5140         tbl = &session->bc_slot_table;
5141         tbl->highest_used_slotid = -1;
5142         spin_lock_init(&tbl->slot_tbl_lock);
5143         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5144         init_completion(&tbl->complete);
5145
5146         session->session_state = 1<<NFS4_SESSION_INITING;
5147
5148         session->clp = clp;
5149         return session;
5150 }
5151
5152 void nfs4_destroy_session(struct nfs4_session *session)
5153 {
5154         nfs4_proc_destroy_session(session);
5155         dprintk("%s Destroy backchannel for xprt %p\n",
5156                 __func__, session->clp->cl_rpcclient->cl_xprt);
5157         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5158                                 NFS41_BC_MIN_CALLBACKS);
5159         nfs4_destroy_slot_tables(session);
5160         kfree(session);
5161 }
5162
5163 /*
5164  * Initialize the values to be used by the client in CREATE_SESSION
5165  * If nfs4_init_session set the fore channel request and response sizes,
5166  * use them.
5167  *
5168  * Set the back channel max_resp_sz_cached to zero to force the client to
5169  * always set csa_cachethis to FALSE because the current implementation
5170  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5171  */
5172 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5173 {
5174         struct nfs4_session *session = args->client->cl_session;
5175         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5176                      mxresp_sz = session->fc_attrs.max_resp_sz;
5177
5178         if (mxrqst_sz == 0)
5179                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5180         if (mxresp_sz == 0)
5181                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5182         /* Fore channel attributes */
5183         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5184         args->fc_attrs.max_resp_sz = mxresp_sz;
5185         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5186         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5187
5188         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5189                 "max_ops=%u max_reqs=%u\n",
5190                 __func__,
5191                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5192                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5193
5194         /* Back channel attributes */
5195         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5196         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5197         args->bc_attrs.max_resp_sz_cached = 0;
5198         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5199         args->bc_attrs.max_reqs = 1;
5200
5201         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5202                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5203                 __func__,
5204                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5205                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5206                 args->bc_attrs.max_reqs);
5207 }
5208
5209 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5210 {
5211         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5212         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5213
5214         if (rcvd->max_resp_sz > sent->max_resp_sz)
5215                 return -EINVAL;
5216         /*
5217          * Our requested max_ops is the minimum we need; we're not
5218          * prepared to break up compounds into smaller pieces than that.
5219          * So, no point even trying to continue if the server won't
5220          * cooperate:
5221          */
5222         if (rcvd->max_ops < sent->max_ops)
5223                 return -EINVAL;
5224         if (rcvd->max_reqs == 0)
5225                 return -EINVAL;
5226         return 0;
5227 }
5228
5229 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5230 {
5231         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5232         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5233
5234         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5235                 return -EINVAL;
5236         if (rcvd->max_resp_sz < sent->max_resp_sz)
5237                 return -EINVAL;
5238         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5239                 return -EINVAL;
5240         /* These would render the backchannel useless: */
5241         if (rcvd->max_ops  == 0)
5242                 return -EINVAL;
5243         if (rcvd->max_reqs == 0)
5244                 return -EINVAL;
5245         return 0;
5246 }
5247
5248 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5249                                      struct nfs4_session *session)
5250 {
5251         int ret;
5252
5253         ret = nfs4_verify_fore_channel_attrs(args, session);
5254         if (ret)
5255                 return ret;
5256         return nfs4_verify_back_channel_attrs(args, session);
5257 }
5258
5259 static int _nfs4_proc_create_session(struct nfs_client *clp)
5260 {
5261         struct nfs4_session *session = clp->cl_session;
5262         struct nfs41_create_session_args args = {
5263                 .client = clp,
5264                 .cb_program = NFS4_CALLBACK,
5265         };
5266         struct nfs41_create_session_res res = {
5267                 .client = clp,
5268         };
5269         struct rpc_message msg = {
5270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5271                 .rpc_argp = &args,
5272                 .rpc_resp = &res,
5273         };
5274         int status;
5275
5276         nfs4_init_channel_attrs(&args);
5277         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5278
5279         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5280
5281         if (!status)
5282                 /* Verify the session's negotiated channel_attrs values */
5283                 status = nfs4_verify_channel_attrs(&args, session);
5284         if (!status) {
5285                 /* Increment the clientid slot sequence id */
5286                 clp->cl_seqid++;
5287         }
5288
5289         return status;
5290 }
5291
5292 /*
5293  * Issues a CREATE_SESSION operation to the server.
5294  * It is the responsibility of the caller to verify the session is
5295  * expired before calling this routine.
5296  */
5297 int nfs4_proc_create_session(struct nfs_client *clp)
5298 {
5299         int status;
5300         unsigned *ptr;
5301         struct nfs4_session *session = clp->cl_session;
5302
5303         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5304
5305         status = _nfs4_proc_create_session(clp);
5306         if (status)
5307                 goto out;
5308
5309         /* Init and reset the fore channel */
5310         status = nfs4_init_slot_tables(session);
5311         dprintk("slot table initialization returned %d\n", status);
5312         if (status)
5313                 goto out;
5314         status = nfs4_reset_slot_tables(session);
5315         dprintk("slot table reset returned %d\n", status);
5316         if (status)
5317                 goto out;
5318
5319         ptr = (unsigned *)&session->sess_id.data[0];
5320         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5321                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5322 out:
5323         dprintk("<-- %s\n", __func__);
5324         return status;
5325 }
5326
5327 /*
5328  * Issue the over-the-wire RPC DESTROY_SESSION.
5329  * The caller must serialize access to this routine.
5330  */
5331 int nfs4_proc_destroy_session(struct nfs4_session *session)
5332 {
5333         int status = 0;
5334         struct rpc_message msg;
5335
5336         dprintk("--> nfs4_proc_destroy_session\n");
5337
5338         /* session is still being setup */
5339         if (session->clp->cl_cons_state != NFS_CS_READY)
5340                 return status;
5341
5342         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5343         msg.rpc_argp = session;
5344         msg.rpc_resp = NULL;
5345         msg.rpc_cred = NULL;
5346         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5347
5348         if (status)
5349                 printk(KERN_WARNING
5350                         "Got error %d from the server on DESTROY_SESSION. "
5351                         "Session has been destroyed regardless...\n", status);
5352
5353         dprintk("<-- nfs4_proc_destroy_session\n");
5354         return status;
5355 }
5356
5357 int nfs4_init_session(struct nfs_server *server)
5358 {
5359         struct nfs_client *clp = server->nfs_client;
5360         struct nfs4_session *session;
5361         unsigned int rsize, wsize;
5362         int ret;
5363
5364         if (!nfs4_has_session(clp))
5365                 return 0;
5366
5367         session = clp->cl_session;
5368         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5369                 return 0;
5370
5371         rsize = server->rsize;
5372         if (rsize == 0)
5373                 rsize = NFS_MAX_FILE_IO_SIZE;
5374         wsize = server->wsize;
5375         if (wsize == 0)
5376                 wsize = NFS_MAX_FILE_IO_SIZE;
5377
5378         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5379         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5380
5381         ret = nfs4_recover_expired_lease(server);
5382         if (!ret)
5383                 ret = nfs4_check_client_ready(clp);
5384         return ret;
5385 }
5386
5387 int nfs4_init_ds_session(struct nfs_client *clp)
5388 {
5389         struct nfs4_session *session = clp->cl_session;
5390         int ret;
5391
5392         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5393                 return 0;
5394
5395         ret = nfs4_client_recover_expired_lease(clp);
5396         if (!ret)
5397                 /* Test for the DS role */
5398                 if (!is_ds_client(clp))
5399                         ret = -ENODEV;
5400         if (!ret)
5401                 ret = nfs4_check_client_ready(clp);
5402         return ret;
5403
5404 }
5405 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5406
5407
5408 /*
5409  * Renew the cl_session lease.
5410  */
5411 struct nfs4_sequence_data {
5412         struct nfs_client *clp;
5413         struct nfs4_sequence_args args;
5414         struct nfs4_sequence_res res;
5415 };
5416
5417 static void nfs41_sequence_release(void *data)
5418 {
5419         struct nfs4_sequence_data *calldata = data;
5420         struct nfs_client *clp = calldata->clp;
5421
5422         if (atomic_read(&clp->cl_count) > 1)
5423                 nfs4_schedule_state_renewal(clp);
5424         nfs_put_client(clp);
5425         kfree(calldata);
5426 }
5427
5428 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5429 {
5430         switch(task->tk_status) {
5431         case -NFS4ERR_DELAY:
5432                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5433                 return -EAGAIN;
5434         default:
5435                 nfs4_schedule_lease_recovery(clp);
5436         }
5437         return 0;
5438 }
5439
5440 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5441 {
5442         struct nfs4_sequence_data *calldata = data;
5443         struct nfs_client *clp = calldata->clp;
5444
5445         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5446                 return;
5447
5448         if (task->tk_status < 0) {
5449                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5450                 if (atomic_read(&clp->cl_count) == 1)
5451                         goto out;
5452
5453                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5454                         rpc_restart_call_prepare(task);
5455                         return;
5456                 }
5457         }
5458         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5459 out:
5460         dprintk("<-- %s\n", __func__);
5461 }
5462
5463 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5464 {
5465         struct nfs4_sequence_data *calldata = data;
5466         struct nfs_client *clp = calldata->clp;
5467         struct nfs4_sequence_args *args;
5468         struct nfs4_sequence_res *res;
5469
5470         args = task->tk_msg.rpc_argp;
5471         res = task->tk_msg.rpc_resp;
5472
5473         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5474                 return;
5475         rpc_call_start(task);
5476 }
5477
5478 static const struct rpc_call_ops nfs41_sequence_ops = {
5479         .rpc_call_done = nfs41_sequence_call_done,
5480         .rpc_call_prepare = nfs41_sequence_prepare,
5481         .rpc_release = nfs41_sequence_release,
5482 };
5483
5484 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5485 {
5486         struct nfs4_sequence_data *calldata;
5487         struct rpc_message msg = {
5488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5489                 .rpc_cred = cred,
5490         };
5491         struct rpc_task_setup task_setup_data = {
5492                 .rpc_client = clp->cl_rpcclient,
5493                 .rpc_message = &msg,
5494                 .callback_ops = &nfs41_sequence_ops,
5495                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5496         };
5497
5498         if (!atomic_inc_not_zero(&clp->cl_count))
5499                 return ERR_PTR(-EIO);
5500         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5501         if (calldata == NULL) {
5502                 nfs_put_client(clp);
5503                 return ERR_PTR(-ENOMEM);
5504         }
5505         msg.rpc_argp = &calldata->args;
5506         msg.rpc_resp = &calldata->res;
5507         calldata->clp = clp;
5508         task_setup_data.callback_data = calldata;
5509
5510         return rpc_run_task(&task_setup_data);
5511 }
5512
5513 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5514 {
5515         struct rpc_task *task;
5516         int ret = 0;
5517
5518         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5519                 return 0;
5520         task = _nfs41_proc_sequence(clp, cred);
5521         if (IS_ERR(task))
5522                 ret = PTR_ERR(task);
5523         else
5524                 rpc_put_task_async(task);
5525         dprintk("<-- %s status=%d\n", __func__, ret);
5526         return ret;
5527 }
5528
5529 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5530 {
5531         struct rpc_task *task;
5532         int ret;
5533
5534         task = _nfs41_proc_sequence(clp, cred);
5535         if (IS_ERR(task)) {
5536                 ret = PTR_ERR(task);
5537                 goto out;
5538         }
5539         ret = rpc_wait_for_completion_task(task);
5540         if (!ret) {
5541                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5542
5543                 if (task->tk_status == 0)
5544                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5545                 ret = task->tk_status;
5546         }
5547         rpc_put_task(task);
5548 out:
5549         dprintk("<-- %s status=%d\n", __func__, ret);
5550         return ret;
5551 }
5552
5553 struct nfs4_reclaim_complete_data {
5554         struct nfs_client *clp;
5555         struct nfs41_reclaim_complete_args arg;
5556         struct nfs41_reclaim_complete_res res;
5557 };
5558
5559 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5560 {
5561         struct nfs4_reclaim_complete_data *calldata = data;
5562
5563         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5564         if (nfs41_setup_sequence(calldata->clp->cl_session,
5565                                 &calldata->arg.seq_args,
5566                                 &calldata->res.seq_res, 0, task))
5567                 return;
5568
5569         rpc_call_start(task);
5570 }
5571
5572 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5573 {
5574         switch(task->tk_status) {
5575         case 0:
5576         case -NFS4ERR_COMPLETE_ALREADY:
5577         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5578                 break;
5579         case -NFS4ERR_DELAY:
5580                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5581                 /* fall through */
5582         case -NFS4ERR_RETRY_UNCACHED_REP:
5583                 return -EAGAIN;
5584         default:
5585                 nfs4_schedule_lease_recovery(clp);
5586         }
5587         return 0;
5588 }
5589
5590 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5591 {
5592         struct nfs4_reclaim_complete_data *calldata = data;
5593         struct nfs_client *clp = calldata->clp;
5594         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5595
5596         dprintk("--> %s\n", __func__);
5597         if (!nfs41_sequence_done(task, res))
5598                 return;
5599
5600         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5601                 rpc_restart_call_prepare(task);
5602                 return;
5603         }
5604         dprintk("<-- %s\n", __func__);
5605 }
5606
5607 static void nfs4_free_reclaim_complete_data(void *data)
5608 {
5609         struct nfs4_reclaim_complete_data *calldata = data;
5610
5611         kfree(calldata);
5612 }
5613
5614 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5615         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5616         .rpc_call_done = nfs4_reclaim_complete_done,
5617         .rpc_release = nfs4_free_reclaim_complete_data,
5618 };
5619
5620 /*
5621  * Issue a global reclaim complete.
5622  */
5623 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5624 {
5625         struct nfs4_reclaim_complete_data *calldata;
5626         struct rpc_task *task;
5627         struct rpc_message msg = {
5628                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5629         };
5630         struct rpc_task_setup task_setup_data = {
5631                 .rpc_client = clp->cl_rpcclient,
5632                 .rpc_message = &msg,
5633                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5634                 .flags = RPC_TASK_ASYNC,
5635         };
5636         int status = -ENOMEM;
5637
5638         dprintk("--> %s\n", __func__);
5639         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5640         if (calldata == NULL)
5641                 goto out;
5642         calldata->clp = clp;
5643         calldata->arg.one_fs = 0;
5644
5645         msg.rpc_argp = &calldata->arg;
5646         msg.rpc_resp = &calldata->res;
5647         task_setup_data.callback_data = calldata;
5648         task = rpc_run_task(&task_setup_data);
5649         if (IS_ERR(task)) {
5650                 status = PTR_ERR(task);
5651                 goto out;
5652         }
5653         status = nfs4_wait_for_completion_rpc_task(task);
5654         if (status == 0)
5655                 status = task->tk_status;
5656         rpc_put_task(task);
5657         return 0;
5658 out:
5659         dprintk("<-- %s status=%d\n", __func__, status);
5660         return status;
5661 }
5662
5663 static void
5664 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5665 {
5666         struct nfs4_layoutget *lgp = calldata;
5667         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5668
5669         dprintk("--> %s\n", __func__);
5670         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5671          * right now covering the LAYOUTGET we are about to send.
5672          * However, that is not so catastrophic, and there seems
5673          * to be no way to prevent it completely.
5674          */
5675         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5676                                 &lgp->res.seq_res, 0, task))
5677                 return;
5678         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5679                                           NFS_I(lgp->args.inode)->layout,
5680                                           lgp->args.ctx->state)) {
5681                 rpc_exit(task, NFS4_OK);
5682                 return;
5683         }
5684         rpc_call_start(task);
5685 }
5686
5687 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5688 {
5689         struct nfs4_layoutget *lgp = calldata;
5690         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5691
5692         dprintk("--> %s\n", __func__);
5693
5694         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5695                 return;
5696
5697         switch (task->tk_status) {
5698         case 0:
5699                 break;
5700         case -NFS4ERR_LAYOUTTRYLATER:
5701         case -NFS4ERR_RECALLCONFLICT:
5702                 task->tk_status = -NFS4ERR_DELAY;
5703                 /* Fall through */
5704         default:
5705                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5706                         rpc_restart_call_prepare(task);
5707                         return;
5708                 }
5709         }
5710         dprintk("<-- %s\n", __func__);
5711 }
5712
5713 static void nfs4_layoutget_release(void *calldata)
5714 {
5715         struct nfs4_layoutget *lgp = calldata;
5716
5717         dprintk("--> %s\n", __func__);
5718         put_nfs_open_context(lgp->args.ctx);
5719         kfree(calldata);
5720         dprintk("<-- %s\n", __func__);
5721 }
5722
5723 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5724         .rpc_call_prepare = nfs4_layoutget_prepare,
5725         .rpc_call_done = nfs4_layoutget_done,
5726         .rpc_release = nfs4_layoutget_release,
5727 };
5728
5729 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5730 {
5731         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5732         struct rpc_task *task;
5733         struct rpc_message msg = {
5734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5735                 .rpc_argp = &lgp->args,
5736                 .rpc_resp = &lgp->res,
5737         };
5738         struct rpc_task_setup task_setup_data = {
5739                 .rpc_client = server->client,
5740                 .rpc_message = &msg,
5741                 .callback_ops = &nfs4_layoutget_call_ops,
5742                 .callback_data = lgp,
5743                 .flags = RPC_TASK_ASYNC,
5744         };
5745         int status = 0;
5746
5747         dprintk("--> %s\n", __func__);
5748
5749         lgp->res.layoutp = &lgp->args.layout;
5750         lgp->res.seq_res.sr_slot = NULL;
5751         task = rpc_run_task(&task_setup_data);
5752         if (IS_ERR(task))
5753                 return PTR_ERR(task);
5754         status = nfs4_wait_for_completion_rpc_task(task);
5755         if (status == 0)
5756                 status = task->tk_status;
5757         if (status == 0)
5758                 status = pnfs_layout_process(lgp);
5759         rpc_put_task(task);
5760         dprintk("<-- %s status=%d\n", __func__, status);
5761         return status;
5762 }
5763
5764 static void
5765 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5766 {
5767         struct nfs4_layoutreturn *lrp = calldata;
5768
5769         dprintk("--> %s\n", __func__);
5770         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5771                                 &lrp->res.seq_res, 0, task))
5772                 return;
5773         rpc_call_start(task);
5774 }
5775
5776 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5777 {
5778         struct nfs4_layoutreturn *lrp = calldata;
5779         struct nfs_server *server;
5780         struct pnfs_layout_hdr *lo = lrp->args.layout;
5781
5782         dprintk("--> %s\n", __func__);
5783
5784         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5785                 return;
5786
5787         server = NFS_SERVER(lrp->args.inode);
5788         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5789                 nfs_restart_rpc(task, lrp->clp);
5790                 return;
5791         }
5792         spin_lock(&lo->plh_inode->i_lock);
5793         if (task->tk_status == 0) {
5794                 if (lrp->res.lrs_present) {
5795                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5796                 } else
5797                         BUG_ON(!list_empty(&lo->plh_segs));
5798         }
5799         lo->plh_block_lgets--;
5800         spin_unlock(&lo->plh_inode->i_lock);
5801         dprintk("<-- %s\n", __func__);
5802 }
5803
5804 static void nfs4_layoutreturn_release(void *calldata)
5805 {
5806         struct nfs4_layoutreturn *lrp = calldata;
5807
5808         dprintk("--> %s\n", __func__);
5809         put_layout_hdr(lrp->args.layout);
5810         kfree(calldata);
5811         dprintk("<-- %s\n", __func__);
5812 }
5813
5814 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5815         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5816         .rpc_call_done = nfs4_layoutreturn_done,
5817         .rpc_release = nfs4_layoutreturn_release,
5818 };
5819
5820 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5821 {
5822         struct rpc_task *task;
5823         struct rpc_message msg = {
5824                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5825                 .rpc_argp = &lrp->args,
5826                 .rpc_resp = &lrp->res,
5827         };
5828         struct rpc_task_setup task_setup_data = {
5829                 .rpc_client = lrp->clp->cl_rpcclient,
5830                 .rpc_message = &msg,
5831                 .callback_ops = &nfs4_layoutreturn_call_ops,
5832                 .callback_data = lrp,
5833         };
5834         int status;
5835
5836         dprintk("--> %s\n", __func__);
5837         task = rpc_run_task(&task_setup_data);
5838         if (IS_ERR(task))
5839                 return PTR_ERR(task);
5840         status = task->tk_status;
5841         dprintk("<-- %s status=%d\n", __func__, status);
5842         rpc_put_task(task);
5843         return status;
5844 }
5845
5846 /*
5847  * Retrieve the list of Data Server devices from the MDS.
5848  */
5849 static int _nfs4_getdevicelist(struct nfs_server *server,
5850                                     const struct nfs_fh *fh,
5851                                     struct pnfs_devicelist *devlist)
5852 {
5853         struct nfs4_getdevicelist_args args = {
5854                 .fh = fh,
5855                 .layoutclass = server->pnfs_curr_ld->id,
5856         };
5857         struct nfs4_getdevicelist_res res = {
5858                 .devlist = devlist,
5859         };
5860         struct rpc_message msg = {
5861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5862                 .rpc_argp = &args,
5863                 .rpc_resp = &res,
5864         };
5865         int status;
5866
5867         dprintk("--> %s\n", __func__);
5868         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5869                                 &res.seq_res, 0);
5870         dprintk("<-- %s status=%d\n", __func__, status);
5871         return status;
5872 }
5873
5874 int nfs4_proc_getdevicelist(struct nfs_server *server,
5875                             const struct nfs_fh *fh,
5876                             struct pnfs_devicelist *devlist)
5877 {
5878         struct nfs4_exception exception = { };
5879         int err;
5880
5881         do {
5882                 err = nfs4_handle_exception(server,
5883                                 _nfs4_getdevicelist(server, fh, devlist),
5884                                 &exception);
5885         } while (exception.retry);
5886
5887         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5888                 err, devlist->num_devs);
5889
5890         return err;
5891 }
5892 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5893
5894 static int
5895 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5896 {
5897         struct nfs4_getdeviceinfo_args args = {
5898                 .pdev = pdev,
5899         };
5900         struct nfs4_getdeviceinfo_res res = {
5901                 .pdev = pdev,
5902         };
5903         struct rpc_message msg = {
5904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5905                 .rpc_argp = &args,
5906                 .rpc_resp = &res,
5907         };
5908         int status;
5909
5910         dprintk("--> %s\n", __func__);
5911         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5912         dprintk("<-- %s status=%d\n", __func__, status);
5913
5914         return status;
5915 }
5916
5917 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5918 {
5919         struct nfs4_exception exception = { };
5920         int err;
5921
5922         do {
5923                 err = nfs4_handle_exception(server,
5924                                         _nfs4_proc_getdeviceinfo(server, pdev),
5925                                         &exception);
5926         } while (exception.retry);
5927         return err;
5928 }
5929 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5930
5931 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5932 {
5933         struct nfs4_layoutcommit_data *data = calldata;
5934         struct nfs_server *server = NFS_SERVER(data->args.inode);
5935
5936         if (nfs4_setup_sequence(server, &data->args.seq_args,
5937                                 &data->res.seq_res, 1, task))
5938                 return;
5939         rpc_call_start(task);
5940 }
5941
5942 static void
5943 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5944 {
5945         struct nfs4_layoutcommit_data *data = calldata;
5946         struct nfs_server *server = NFS_SERVER(data->args.inode);
5947
5948         if (!nfs4_sequence_done(task, &data->res.seq_res))
5949                 return;
5950
5951         switch (task->tk_status) { /* Just ignore these failures */
5952         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5953         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5954         case NFS4ERR_BADLAYOUT:     /* no layout */
5955         case NFS4ERR_GRACE:         /* loca_recalim always false */
5956                 task->tk_status = 0;
5957         }
5958
5959         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5960                 nfs_restart_rpc(task, server->nfs_client);
5961                 return;
5962         }
5963
5964         if (task->tk_status == 0)
5965                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5966                                                    data->res.fattr);
5967 }
5968
5969 static void nfs4_layoutcommit_release(void *calldata)
5970 {
5971         struct nfs4_layoutcommit_data *data = calldata;
5972         struct pnfs_layout_segment *lseg, *tmp;
5973
5974         pnfs_cleanup_layoutcommit(data);
5975         /* Matched by references in pnfs_set_layoutcommit */
5976         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5977                 list_del_init(&lseg->pls_lc_list);
5978                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5979                                        &lseg->pls_flags))
5980                         put_lseg(lseg);
5981         }
5982         put_rpccred(data->cred);
5983         kfree(data);
5984 }
5985
5986 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5987         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5988         .rpc_call_done = nfs4_layoutcommit_done,
5989         .rpc_release = nfs4_layoutcommit_release,
5990 };
5991
5992 int
5993 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5994 {
5995         struct rpc_message msg = {
5996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5997                 .rpc_argp = &data->args,
5998                 .rpc_resp = &data->res,
5999                 .rpc_cred = data->cred,
6000         };
6001         struct rpc_task_setup task_setup_data = {
6002                 .task = &data->task,
6003                 .rpc_client = NFS_CLIENT(data->args.inode),
6004                 .rpc_message = &msg,
6005                 .callback_ops = &nfs4_layoutcommit_ops,
6006                 .callback_data = data,
6007                 .flags = RPC_TASK_ASYNC,
6008         };
6009         struct rpc_task *task;
6010         int status = 0;
6011
6012         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6013                 "lbw: %llu inode %lu\n",
6014                 data->task.tk_pid, sync,
6015                 data->args.lastbytewritten,
6016                 data->args.inode->i_ino);
6017
6018         task = rpc_run_task(&task_setup_data);
6019         if (IS_ERR(task))
6020                 return PTR_ERR(task);
6021         if (sync == false)
6022                 goto out;
6023         status = nfs4_wait_for_completion_rpc_task(task);
6024         if (status != 0)
6025                 goto out;
6026         status = task->tk_status;
6027 out:
6028         dprintk("%s: status %d\n", __func__, status);
6029         rpc_put_task(task);
6030         return status;
6031 }
6032
6033 static int
6034 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6035                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6036 {
6037         struct nfs41_secinfo_no_name_args args = {
6038                 .style = SECINFO_STYLE_CURRENT_FH,
6039         };
6040         struct nfs4_secinfo_res res = {
6041                 .flavors = flavors,
6042         };
6043         struct rpc_message msg = {
6044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6045                 .rpc_argp = &args,
6046                 .rpc_resp = &res,
6047         };
6048         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6049 }
6050
6051 static int
6052 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6053                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6054 {
6055         struct nfs4_exception exception = { };
6056         int err;
6057         do {
6058                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6059                 switch (err) {
6060                 case 0:
6061                 case -NFS4ERR_WRONGSEC:
6062                 case -NFS4ERR_NOTSUPP:
6063                         break;
6064                 default:
6065                         err = nfs4_handle_exception(server, err, &exception);
6066                 }
6067         } while (exception.retry);
6068         return err;
6069 }
6070
6071 static int
6072 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6073                     struct nfs_fsinfo *info)
6074 {
6075         int err;
6076         struct page *page;
6077         rpc_authflavor_t flavor;
6078         struct nfs4_secinfo_flavors *flavors;
6079
6080         page = alloc_page(GFP_KERNEL);
6081         if (!page) {
6082                 err = -ENOMEM;
6083                 goto out;
6084         }
6085
6086         flavors = page_address(page);
6087         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6088
6089         /*
6090          * Fall back on "guess and check" method if
6091          * the server doesn't support SECINFO_NO_NAME
6092          */
6093         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6094                 err = nfs4_find_root_sec(server, fhandle, info);
6095                 goto out_freepage;
6096         }
6097         if (err)
6098                 goto out_freepage;
6099
6100         flavor = nfs_find_best_sec(flavors);
6101         if (err == 0)
6102                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6103
6104 out_freepage:
6105         put_page(page);
6106         if (err == -EACCES)
6107                 return -EPERM;
6108 out:
6109         return err;
6110 }
6111 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6112 {
6113         int status;
6114         struct nfs41_test_stateid_args args = {
6115                 .stateid = &state->stateid,
6116         };
6117         struct nfs41_test_stateid_res res;
6118         struct rpc_message msg = {
6119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6120                 .rpc_argp = &args,
6121                 .rpc_resp = &res,
6122         };
6123         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6124         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6125         return status;
6126 }
6127
6128 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6129 {
6130         struct nfs4_exception exception = { };
6131         int err;
6132         do {
6133                 err = nfs4_handle_exception(server,
6134                                 _nfs41_test_stateid(server, state),
6135                                 &exception);
6136         } while (exception.retry);
6137         return err;
6138 }
6139
6140 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6141 {
6142         int status;
6143         struct nfs41_free_stateid_args args = {
6144                 .stateid = &state->stateid,
6145         };
6146         struct nfs41_free_stateid_res res;
6147         struct rpc_message msg = {
6148                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6149                 .rpc_argp = &args,
6150                 .rpc_resp = &res,
6151         };
6152
6153         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6154         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6155         return status;
6156 }
6157
6158 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6159 {
6160         struct nfs4_exception exception = { };
6161         int err;
6162         do {
6163                 err = nfs4_handle_exception(server,
6164                                 _nfs4_free_stateid(server, state),
6165                                 &exception);
6166         } while (exception.retry);
6167         return err;
6168 }
6169 #endif /* CONFIG_NFS_V4_1 */
6170
6171 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6172         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6173         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6174         .recover_open   = nfs4_open_reclaim,
6175         .recover_lock   = nfs4_lock_reclaim,
6176         .establish_clid = nfs4_init_clientid,
6177         .get_clid_cred  = nfs4_get_setclientid_cred,
6178 };
6179
6180 #if defined(CONFIG_NFS_V4_1)
6181 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6182         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6183         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6184         .recover_open   = nfs4_open_reclaim,
6185         .recover_lock   = nfs4_lock_reclaim,
6186         .establish_clid = nfs41_init_clientid,
6187         .get_clid_cred  = nfs4_get_exchange_id_cred,
6188         .reclaim_complete = nfs41_proc_reclaim_complete,
6189 };
6190 #endif /* CONFIG_NFS_V4_1 */
6191
6192 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6193         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6194         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6195         .recover_open   = nfs4_open_expired,
6196         .recover_lock   = nfs4_lock_expired,
6197         .establish_clid = nfs4_init_clientid,
6198         .get_clid_cred  = nfs4_get_setclientid_cred,
6199 };
6200
6201 #if defined(CONFIG_NFS_V4_1)
6202 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6203         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6204         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6205         .recover_open   = nfs41_open_expired,
6206         .recover_lock   = nfs41_lock_expired,
6207         .establish_clid = nfs41_init_clientid,
6208         .get_clid_cred  = nfs4_get_exchange_id_cred,
6209 };
6210 #endif /* CONFIG_NFS_V4_1 */
6211
6212 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6213         .sched_state_renewal = nfs4_proc_async_renew,
6214         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6215         .renew_lease = nfs4_proc_renew,
6216 };
6217
6218 #if defined(CONFIG_NFS_V4_1)
6219 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6220         .sched_state_renewal = nfs41_proc_async_sequence,
6221         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6222         .renew_lease = nfs4_proc_sequence,
6223 };
6224 #endif
6225
6226 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6227         .minor_version = 0,
6228         .call_sync = _nfs4_call_sync,
6229         .validate_stateid = nfs4_validate_delegation_stateid,
6230         .find_root_sec = nfs4_find_root_sec,
6231         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6232         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6233         .state_renewal_ops = &nfs40_state_renewal_ops,
6234 };
6235
6236 #if defined(CONFIG_NFS_V4_1)
6237 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6238         .minor_version = 1,
6239         .call_sync = _nfs4_call_sync_session,
6240         .validate_stateid = nfs41_validate_delegation_stateid,
6241         .find_root_sec = nfs41_find_root_sec,
6242         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6243         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6244         .state_renewal_ops = &nfs41_state_renewal_ops,
6245 };
6246 #endif
6247
6248 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6249         [0] = &nfs_v4_0_minor_ops,
6250 #if defined(CONFIG_NFS_V4_1)
6251         [1] = &nfs_v4_1_minor_ops,
6252 #endif
6253 };
6254
6255 static const struct inode_operations nfs4_file_inode_operations = {
6256         .permission     = nfs_permission,
6257         .getattr        = nfs_getattr,
6258         .setattr        = nfs_setattr,
6259         .getxattr       = generic_getxattr,
6260         .setxattr       = generic_setxattr,
6261         .listxattr      = generic_listxattr,
6262         .removexattr    = generic_removexattr,
6263 };
6264
6265 const struct nfs_rpc_ops nfs_v4_clientops = {
6266         .version        = 4,                    /* protocol version */
6267         .dentry_ops     = &nfs4_dentry_operations,
6268         .dir_inode_ops  = &nfs4_dir_inode_operations,
6269         .file_inode_ops = &nfs4_file_inode_operations,
6270         .getroot        = nfs4_proc_get_root,
6271         .getattr        = nfs4_proc_getattr,
6272         .setattr        = nfs4_proc_setattr,
6273         .lookupfh       = nfs4_proc_lookupfh,
6274         .lookup         = nfs4_proc_lookup,
6275         .access         = nfs4_proc_access,
6276         .readlink       = nfs4_proc_readlink,
6277         .create         = nfs4_proc_create,
6278         .remove         = nfs4_proc_remove,
6279         .unlink_setup   = nfs4_proc_unlink_setup,
6280         .unlink_done    = nfs4_proc_unlink_done,
6281         .rename         = nfs4_proc_rename,
6282         .rename_setup   = nfs4_proc_rename_setup,
6283         .rename_done    = nfs4_proc_rename_done,
6284         .link           = nfs4_proc_link,
6285         .symlink        = nfs4_proc_symlink,
6286         .mkdir          = nfs4_proc_mkdir,
6287         .rmdir          = nfs4_proc_remove,
6288         .readdir        = nfs4_proc_readdir,
6289         .mknod          = nfs4_proc_mknod,
6290         .statfs         = nfs4_proc_statfs,
6291         .fsinfo         = nfs4_proc_fsinfo,
6292         .pathconf       = nfs4_proc_pathconf,
6293         .set_capabilities = nfs4_server_capabilities,
6294         .decode_dirent  = nfs4_decode_dirent,
6295         .read_setup     = nfs4_proc_read_setup,
6296         .read_done      = nfs4_read_done,
6297         .write_setup    = nfs4_proc_write_setup,
6298         .write_done     = nfs4_write_done,
6299         .commit_setup   = nfs4_proc_commit_setup,
6300         .commit_done    = nfs4_commit_done,
6301         .lock           = nfs4_proc_lock,
6302         .clear_acl_cache = nfs4_zap_acl_attr,
6303         .close_context  = nfs4_close_context,
6304         .open_context   = nfs4_atomic_open,
6305         .init_client    = nfs4_init_client,
6306         .secinfo        = nfs4_proc_secinfo,
6307 };
6308
6309 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6310         .prefix = XATTR_NAME_NFSV4_ACL,
6311         .list   = nfs4_xattr_list_nfs4_acl,
6312         .get    = nfs4_xattr_get_nfs4_acl,
6313         .set    = nfs4_xattr_set_nfs4_acl,
6314 };
6315
6316 const struct xattr_handler *nfs4_xattr_handlers[] = {
6317         &nfs4_xattr_nfs4_acl_handler,
6318         NULL
6319 };
6320
6321 /*
6322  * Local variables:
6323  *  c-basic-offset: 8
6324  * End:
6325  */