fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 struct nfs4_opendata;
  76 static int _nfs4_proc_open(struct nfs4_opendata *data);
  77 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  78 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  79 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  80 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  81 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  82                             struct nfs_fattr *fattr, struct iattr *sattr,
  83                             struct nfs4_state *state);
  84 #ifdef CONFIG_NFS_V4_1
  85 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  86 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  87 #endif
  88 /* Prevent leaks of NFSv4 errors into userland */
  89 static int nfs4_map_errors(int err)
  90 {
  91         if (err >= -1000)
  92                 return err;
  93         switch (err) {
  94         case -NFS4ERR_RESOURCE:
  95                 return -EREMOTEIO;
  96         case -NFS4ERR_WRONGSEC:
  97                 return -EPERM;
  98         case -NFS4ERR_BADOWNER:
  99         case -NFS4ERR_BADNAME:
 100                 return -EINVAL;
 101         default:
 102                 dprintk("%s could not handle NFSv4 error %d\n",
 103                                 __func__, -err);
 104                 break;
 105         }
 106         return -EIO;
 107 }
 108
 109 /*
 110  * This is our standard bitmap for GETATTR requests.
 111  */
 112 const u32 nfs4_fattr_bitmap[2] = {
 113         FATTR4_WORD0_TYPE
 114         | FATTR4_WORD0_CHANGE
 115         | FATTR4_WORD0_SIZE
 116         | FATTR4_WORD0_FSID
 117         | FATTR4_WORD0_FILEID,
 118         FATTR4_WORD1_MODE
 119         | FATTR4_WORD1_NUMLINKS
 120         | FATTR4_WORD1_OWNER
 121         | FATTR4_WORD1_OWNER_GROUP
 122         | FATTR4_WORD1_RAWDEV
 123         | FATTR4_WORD1_SPACE_USED
 124         | FATTR4_WORD1_TIME_ACCESS
 125         | FATTR4_WORD1_TIME_METADATA
 126         | FATTR4_WORD1_TIME_MODIFY
 127 };
 128
 129 const u32 nfs4_statfs_bitmap[2] = {
 130         FATTR4_WORD0_FILES_AVAIL
 131         | FATTR4_WORD0_FILES_FREE
 132         | FATTR4_WORD0_FILES_TOTAL,
 133         FATTR4_WORD1_SPACE_AVAIL
 134         | FATTR4_WORD1_SPACE_FREE
 135         | FATTR4_WORD1_SPACE_TOTAL
 136 };
 137
 138 const u32 nfs4_pathconf_bitmap[2] = {
 139         FATTR4_WORD0_MAXLINK
 140         | FATTR4_WORD0_MAXNAME,
 141         0
 142 };
 143
 144 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 145                         | FATTR4_WORD0_MAXREAD
 146                         | FATTR4_WORD0_MAXWRITE
 147                         | FATTR4_WORD0_LEASE_TIME,
 148                         FATTR4_WORD1_TIME_DELTA
 149                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 150                         FATTR4_WORD2_LAYOUT_BLKSIZE
 151 };
 152
 153 const u32 nfs4_fs_locations_bitmap[2] = {
 154         FATTR4_WORD0_TYPE
 155         | FATTR4_WORD0_CHANGE
 156         | FATTR4_WORD0_SIZE
 157         | FATTR4_WORD0_FSID
 158         | FATTR4_WORD0_FILEID
 159         | FATTR4_WORD0_FS_LOCATIONS,
 160         FATTR4_WORD1_MODE
 161         | FATTR4_WORD1_NUMLINKS
 162         | FATTR4_WORD1_OWNER
 163         | FATTR4_WORD1_OWNER_GROUP
 164         | FATTR4_WORD1_RAWDEV
 165         | FATTR4_WORD1_SPACE_USED
 166         | FATTR4_WORD1_TIME_ACCESS
 167         | FATTR4_WORD1_TIME_METADATA
 168         | FATTR4_WORD1_TIME_MODIFY
 169         | FATTR4_WORD1_MOUNTED_ON_FILEID
 170 };
 171
 172 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 173                 struct nfs4_readdir_arg *readdir)
 174 {
 175         __be32 *start, *p;
 176
 177         BUG_ON(readdir->count < 80);
 178         if (cookie > 2) {
 179                 readdir->cookie = cookie;
 180                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 181                 return;
 182         }
 183
 184         readdir->cookie = 0;
 185         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 186         if (cookie == 2)
 187                 return;
 188
 189         /*
 190          * NFSv4 servers do not return entries for '.' and '..'
 191          * Therefore, we fake these entries here.  We let '.'
 192          * have cookie 0 and '..' have cookie 1.  Note that
 193          * when talking to the server, we always send cookie 0
 194          * instead of 1 or 2.
 195          */
 196         start = p = kmap_atomic(*readdir->pages);
 197
 198         if (cookie == 0) {
 199                 *p++ = xdr_one;                                  /* next */
 200                 *p++ = xdr_zero;                   /* cookie, first word */
 201                 *p++ = xdr_one;                   /* cookie, second word */
 202                 *p++ = xdr_one;                             /* entry len */
 203                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 204                 p++;
 205                 *p++ = xdr_one;                         /* bitmap length */
 206                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 207                 *p++ = htonl(8);              /* attribute buffer length */
 208                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 209         }
 210
 211         *p++ = xdr_one;                                  /* next */
 212         *p++ = xdr_zero;                   /* cookie, first word */
 213         *p++ = xdr_two;                   /* cookie, second word */
 214         *p++ = xdr_two;                             /* entry len */
 215         memcpy(p, "..\0\0", 4);                         /* entry */
 216         p++;
 217         *p++ = xdr_one;                         /* bitmap length */
 218         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 219         *p++ = htonl(8);              /* attribute buffer length */
 220         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 221
 222         readdir->pgbase = (char *)p - (char *)start;
 223         readdir->count -= readdir->pgbase;
 224         kunmap_atomic(start);
 225 }
 226
 227 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 228 {
 229         int res;
 230
 231         might_sleep();
 232
 233         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 234                         nfs_wait_bit_killable, TASK_KILLABLE);
 235         return res;
 236 }
 237
 238 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 239 {
 240         int res = 0;
 241
 242         might_sleep();
 243
 244         if (*timeout <= 0)
 245                 *timeout = NFS4_POLL_RETRY_MIN;
 246         if (*timeout > NFS4_POLL_RETRY_MAX)
 247                 *timeout = NFS4_POLL_RETRY_MAX;
 248         freezable_schedule_timeout_killable(*timeout);
 249         if (fatal_signal_pending(current))
 250                 res = -ERESTARTSYS;
 251         *timeout <<= 1;
 252         return res;
 253 }
 254
 255 /* This is the error handling routine for processes that are allowed
 256  * to sleep.
 257  */
 258 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 259 {
 260         struct nfs_client *clp = server->nfs_client;
 261         struct nfs4_state *state = exception->state;
 262         int ret = errorcode;
 263
 264         exception->retry = 0;
 265         switch(errorcode) {
 266                 case 0:
 267                         return 0;
 268                 case -NFS4ERR_ADMIN_REVOKED:
 269                 case -NFS4ERR_BAD_STATEID:
 270                 case -NFS4ERR_OPENMODE:
 271                         if (state == NULL)
 272                                 break;
 273                         nfs4_schedule_stateid_recovery(server, state);
 274                         goto wait_on_recovery;
 275                 case -NFS4ERR_EXPIRED:
 276                         if (state != NULL)
 277                                 nfs4_schedule_stateid_recovery(server, state);
 278                 case -NFS4ERR_STALE_STATEID:
 279                 case -NFS4ERR_STALE_CLIENTID:
 280                         nfs4_schedule_lease_recovery(clp);
 281                         goto wait_on_recovery;
 282 #if defined(CONFIG_NFS_V4_1)
 283                 case -NFS4ERR_BADSESSION:
 284                 case -NFS4ERR_BADSLOT:
 285                 case -NFS4ERR_BAD_HIGH_SLOT:
 286                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 287                 case -NFS4ERR_DEADSESSION:
 288                 case -NFS4ERR_SEQ_FALSE_RETRY:
 289                 case -NFS4ERR_SEQ_MISORDERED:
 290                         dprintk("%s ERROR: %d Reset session\n", __func__,
 291                                 errorcode);
 292                         nfs4_schedule_session_recovery(clp->cl_session);
 293                         exception->retry = 1;
 294                         break;
 295 #endif /* defined(CONFIG_NFS_V4_1) */
 296                 case -NFS4ERR_FILE_OPEN:
 297                         if (exception->timeout > HZ) {
 298                                 /* We have retried a decent amount, time to
 299                                  * fail
 300                                  */
 301                                 ret = -EBUSY;
 302                                 break;
 303                         }
 304                 case -NFS4ERR_GRACE:
 305                 case -NFS4ERR_DELAY:
 306                 case -EKEYEXPIRED:
 307                         ret = nfs4_delay(server->client, &exception->timeout);
 308                         if (ret != 0)
 309                                 break;
 310                 case -NFS4ERR_RETRY_UNCACHED_REP:
 311                 case -NFS4ERR_OLD_STATEID:
 312                         exception->retry = 1;
 313                         break;
 314                 case -NFS4ERR_BADOWNER:
 315                         /* The following works around a Linux server bug! */
 316                 case -NFS4ERR_BADNAME:
 317                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 318                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 319                                 exception->retry = 1;
 320                                 printk(KERN_WARNING "NFS: v4 server %s "
 321                                                 "does not accept raw "
 322                                                 "uid/gids. "
 323                                                 "Reenabling the idmapper.\n",
 324                                                 server->nfs_client->cl_hostname);
 325                         }
 326         }
 327         /* We failed to handle the error */
 328         return nfs4_map_errors(ret);
 329 wait_on_recovery:
 330         ret = nfs4_wait_clnt_recover(clp);
 331         if (ret == 0)
 332                 exception->retry = 1;
 333         return ret;
 334 }
 335
 336
 337 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 338 {
 339         spin_lock(&clp->cl_lock);
 340         if (time_before(clp->cl_last_renewal,timestamp))
 341                 clp->cl_last_renewal = timestamp;
 342         spin_unlock(&clp->cl_lock);
 343 }
 344
 345 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 346 {
 347         do_renew_lease(server->nfs_client, timestamp);
 348 }
 349
 350 #if defined(CONFIG_NFS_V4_1)
 351
 352 /*
 353  * nfs4_free_slot - free a slot and efficiently update slot table.
 354  *
 355  * freeing a slot is trivially done by clearing its respective bit
 356  * in the bitmap.
 357  * If the freed slotid equals highest_used_slotid we want to update it
 358  * so that the server would be able to size down the slot table if needed,
 359  * otherwise we know that the highest_used_slotid is still in use.
 360  * When updating highest_used_slotid there may be "holes" in the bitmap
 361  * so we need to scan down from highest_used_slotid to 0 looking for the now
 362  * highest slotid in use.
 363  * If none found, highest_used_slotid is set to -1.
 364  *
 365  * Must be called while holding tbl->slot_tbl_lock
 366  */
 367 static void
 368 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 369 {
 370         int slotid = free_slotid;
 371
 372         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 373         /* clear used bit in bitmap */
 374         __clear_bit(slotid, tbl->used_slots);
 375
 376         /* update highest_used_slotid when it is freed */
 377         if (slotid == tbl->highest_used_slotid) {
 378                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 379                 if (slotid < tbl->max_slots)
 380                         tbl->highest_used_slotid = slotid;
 381                 else
 382                         tbl->highest_used_slotid = -1;
 383         }
 384         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 385                 free_slotid, tbl->highest_used_slotid);
 386 }
 387
 388 /*
 389  * Signal state manager thread if session fore channel is drained
 390  */
 391 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 392 {
 393         struct rpc_task *task;
 394
 395         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 396                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 397                 if (task)
 398                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 399                 return;
 400         }
 401
 402         if (ses->fc_slot_table.highest_used_slotid != -1)
 403                 return;
 404
 405         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 406         complete(&ses->fc_slot_table.complete);
 407 }
 408
 409 /*
 410  * Signal state manager thread if session back channel is drained
 411  */
 412 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 413 {
 414         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 415             ses->bc_slot_table.highest_used_slotid != -1)
 416                 return;
 417         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 418         complete(&ses->bc_slot_table.complete);
 419 }
 420
 421 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 422 {
 423         struct nfs4_slot_table *tbl;
 424
 425         tbl = &res->sr_session->fc_slot_table;
 426         if (!res->sr_slot) {
 427                 /* just wake up the next guy waiting since
 428                  * we may have not consumed a slot after all */
 429                 dprintk("%s: No slot\n", __func__);
 430                 return;
 431         }
 432
 433         spin_lock(&tbl->slot_tbl_lock);
 434         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 435         nfs4_check_drain_fc_complete(res->sr_session);
 436         spin_unlock(&tbl->slot_tbl_lock);
 437         res->sr_slot = NULL;
 438 }
 439
 440 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 441 {
 442         unsigned long timestamp;
 443         struct nfs_client *clp;
 444
 445         /*
 446          * sr_status remains 1 if an RPC level error occurred. The server
 447          * may or may not have processed the sequence operation..
 448          * Proceed as if the server received and processed the sequence
 449          * operation.
 450          */
 451         if (res->sr_status == 1)
 452                 res->sr_status = NFS_OK;
 453
 454         /* don't increment the sequence number if the task wasn't sent */
 455         if (!RPC_WAS_SENT(task))
 456                 goto out;
 457
 458         /* Check the SEQUENCE operation status */
 459         switch (res->sr_status) {
 460         case 0:
 461                 /* Update the slot's sequence and clientid lease timer */
 462                 ++res->sr_slot->seq_nr;
 463                 timestamp = res->sr_renewal_time;
 464                 clp = res->sr_session->clp;
 465                 do_renew_lease(clp, timestamp);
 466                 /* Check sequence flags */
 467                 if (res->sr_status_flags != 0)
 468                         nfs4_schedule_lease_recovery(clp);
 469                 break;
 470         case -NFS4ERR_DELAY:
 471                 /* The server detected a resend of the RPC call and
 472                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 473                  * of RFC5661.
 474                  */
 475                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 476                         __func__,
 477                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 478                         res->sr_slot->seq_nr);
 479                 goto out_retry;
 480         default:
 481                 /* Just update the slot sequence no. */
 482                 ++res->sr_slot->seq_nr;
 483         }
 484 out:
 485         /* The session may be reset by one of the error handlers. */
 486         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 487         nfs41_sequence_free_slot(res);
 488         return 1;
 489 out_retry:
 490         if (!rpc_restart_call(task))
 491                 goto out;
 492         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 493         return 0;
 494 }
 495
 496 static int nfs4_sequence_done(struct rpc_task *task,
 497                                struct nfs4_sequence_res *res)
 498 {
 499         if (res->sr_session == NULL)
 500                 return 1;
 501         return nfs41_sequence_done(task, res);
 502 }
 503
 504 /*
 505  * nfs4_find_slot - efficiently look for a free slot
 506  *
 507  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 508  * If found, we mark the slot as used, update the highest_used_slotid,
 509  * and respectively set up the sequence operation args.
 510  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 511  *
 512  * Note: must be called with under the slot_tbl_lock.
 513  */
 514 static u8
 515 nfs4_find_slot(struct nfs4_slot_table *tbl)
 516 {
 517         int slotid;
 518         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 519         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 520
 521         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 522                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 523                 tbl->max_slots);
 524         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 525         if (slotid >= tbl->max_slots)
 526                 goto out;
 527         __set_bit(slotid, tbl->used_slots);
 528         if (slotid > tbl->highest_used_slotid)
 529                 tbl->highest_used_slotid = slotid;
 530         ret_id = slotid;
 531 out:
 532         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 533                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 534         return ret_id;
 535 }
 536
 537 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                 /* The state manager will wait until the slot table is empty */
 558                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 559                 spin_unlock(&tbl->slot_tbl_lock);
 560                 dprintk("%s session is draining\n", __func__);
 561                 return -EAGAIN;
 562         }
 563
 564         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 565             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 566                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 567                 spin_unlock(&tbl->slot_tbl_lock);
 568                 dprintk("%s enforce FIFO order\n", __func__);
 569                 return -EAGAIN;
 570         }
 571
 572         slotid = nfs4_find_slot(tbl);
 573         if (slotid == NFS4_MAX_SLOT_TABLE) {
 574                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 575                 spin_unlock(&tbl->slot_tbl_lock);
 576                 dprintk("<-- %s: no free slots\n", __func__);
 577                 return -EAGAIN;
 578         }
 579         spin_unlock(&tbl->slot_tbl_lock);
 580
 581         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 582         slot = tbl->slots + slotid;
 583         args->sa_session = session;
 584         args->sa_slotid = slotid;
 585         args->sa_cache_this = cache_reply;
 586
 587         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 588
 589         res->sr_session = session;
 590         res->sr_slot = slot;
 591         res->sr_renewal_time = jiffies;
 592         res->sr_status_flags = 0;
 593         /*
 594          * sr_status is only set in decode_sequence, and so will remain
 595          * set to 1 if an rpc level failure occurs.
 596          */
 597         res->sr_status = 1;
 598         return 0;
 599 }
 600 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 601
 602 int nfs4_setup_sequence(const struct nfs_server *server,
 603                         struct nfs4_sequence_args *args,
 604                         struct nfs4_sequence_res *res,
 605                         int cache_reply,
 606                         struct rpc_task *task)
 607 {
 608         struct nfs4_session *session = nfs4_get_session(server);
 609         int ret = 0;
 610
 611         if (session == NULL) {
 612                 args->sa_session = NULL;
 613                 res->sr_session = NULL;
 614                 goto out;
 615         }
 616
 617         dprintk("--> %s clp %p session %p sr_slot %td\n",
 618                 __func__, session->clp, session, res->sr_slot ?
 619                         res->sr_slot - session->fc_slot_table.slots : -1);
 620
 621         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 622                                    task);
 623 out:
 624         dprintk("<-- %s status=%d\n", __func__, ret);
 625         return ret;
 626 }
 627
 628 struct nfs41_call_sync_data {
 629         const struct nfs_server *seq_server;
 630         struct nfs4_sequence_args *seq_args;
 631         struct nfs4_sequence_res *seq_res;
 632         int cache_reply;
 633 };
 634
 635 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 636 {
 637         struct nfs41_call_sync_data *data = calldata;
 638
 639         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 640
 641         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 642                                 data->seq_res, data->cache_reply, task))
 643                 return;
 644         rpc_call_start(task);
 645 }
 646
 647 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 648 {
 649         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 650         nfs41_call_sync_prepare(task, calldata);
 651 }
 652
 653 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 654 {
 655         struct nfs41_call_sync_data *data = calldata;
 656
 657         nfs41_sequence_done(task, data->seq_res);
 658 }
 659
 660 struct rpc_call_ops nfs41_call_sync_ops = {
 661         .rpc_call_prepare = nfs41_call_sync_prepare,
 662         .rpc_call_done = nfs41_call_sync_done,
 663 };
 664
 665 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 666         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 667         .rpc_call_done = nfs41_call_sync_done,
 668 };
 669
 670 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 671                                    struct nfs_server *server,
 672                                    struct rpc_message *msg,
 673                                    struct nfs4_sequence_args *args,
 674                                    struct nfs4_sequence_res *res,
 675                                    int cache_reply,
 676                                    int privileged)
 677 {
 678         int ret;
 679         struct rpc_task *task;
 680         struct nfs41_call_sync_data data = {
 681                 .seq_server = server,
 682                 .seq_args = args,
 683                 .seq_res = res,
 684                 .cache_reply = cache_reply,
 685         };
 686         struct rpc_task_setup task_setup = {
 687                 .rpc_client = clnt,
 688                 .rpc_message = msg,
 689                 .callback_ops = &nfs41_call_sync_ops,
 690                 .callback_data = &data
 691         };
 692
 693         res->sr_slot = NULL;
 694         if (privileged)
 695                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 696         task = rpc_run_task(&task_setup);
 697         if (IS_ERR(task))
 698                 ret = PTR_ERR(task);
 699         else {
 700                 ret = task->tk_status;
 701                 rpc_put_task(task);
 702         }
 703         return ret;
 704 }
 705
 706 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 707                             struct nfs_server *server,
 708                             struct rpc_message *msg,
 709                             struct nfs4_sequence_args *args,
 710                             struct nfs4_sequence_res *res,
 711                             int cache_reply)
 712 {
 713         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 714 }
 715
 716 #else
 717 static int nfs4_sequence_done(struct rpc_task *task,
 718                                struct nfs4_sequence_res *res)
 719 {
 720         return 1;
 721 }
 722 #endif /* CONFIG_NFS_V4_1 */
 723
 724 int _nfs4_call_sync(struct rpc_clnt *clnt,
 725                     struct nfs_server *server,
 726                     struct rpc_message *msg,
 727                     struct nfs4_sequence_args *args,
 728                     struct nfs4_sequence_res *res,
 729                     int cache_reply)
 730 {
 731         args->sa_session = res->sr_session = NULL;
 732         return rpc_call_sync(clnt, msg, 0);
 733 }
 734
 735 static inline
 736 int nfs4_call_sync(struct rpc_clnt *clnt,
 737                    struct nfs_server *server,
 738                    struct rpc_message *msg,
 739                    struct nfs4_sequence_args *args,
 740                    struct nfs4_sequence_res *res,
 741                    int cache_reply)
 742 {
 743         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 744                                                 args, res, cache_reply);
 745 }
 746
 747 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 748 {
 749         struct nfs_inode *nfsi = NFS_I(dir);
 750
 751         spin_lock(&dir->i_lock);
 752         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 753         if (!cinfo->atomic || cinfo->before != dir->i_version)
 754                 nfs_force_lookup_revalidate(dir);
 755         dir->i_version = cinfo->after;
 756         spin_unlock(&dir->i_lock);
 757 }
 758
 759 struct nfs4_opendata {
 760         struct kref kref;
 761         struct nfs_openargs o_arg;
 762         struct nfs_openres o_res;
 763         struct nfs_open_confirmargs c_arg;
 764         struct nfs_open_confirmres c_res;
 765         struct nfs4_string owner_name;
 766         struct nfs4_string group_name;
 767         struct nfs_fattr f_attr;
 768         struct nfs_fattr dir_attr;
 769         struct dentry *dir;
 770         struct dentry *dentry;
 771         struct nfs4_state_owner *owner;
 772         struct nfs4_state *state;
 773         struct iattr attrs;
 774         unsigned long timestamp;
 775         unsigned int rpc_done : 1;
 776         int rpc_status;
 777         int cancelled;
 778 };
 779
 780
 781 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 782 {
 783         p->o_res.f_attr = &p->f_attr;
 784         p->o_res.dir_attr = &p->dir_attr;
 785         p->o_res.seqid = p->o_arg.seqid;
 786         p->c_res.seqid = p->c_arg.seqid;
 787         p->o_res.server = p->o_arg.server;
 788         nfs_fattr_init(&p->f_attr);
 789         nfs_fattr_init(&p->dir_attr);
 790         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 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.dir_bitmask = server->cache_consistency_bitmask;
 823         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 824         if (flags & O_CREAT) {
 825                 u32 *s;
 826
 827                 p->o_arg.u.attrs = &p->attrs;
 828                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 829                 s = (u32 *) p->o_arg.u.verifier.data;
 830                 s[0] = jiffies;
 831                 s[1] = current->pid;
 832         }
 833         p->c_arg.fh = &p->o_res.fh;
 834         p->c_arg.stateid = &p->o_res.stateid;
 835         p->c_arg.seqid = p->o_arg.seqid;
 836         nfs4_init_opendata_res(p);
 837         kref_init(&p->kref);
 838         return p;
 839 err_free:
 840         kfree(p);
 841 err:
 842         dput(parent);
 843         return NULL;
 844 }
 845
 846 static void nfs4_opendata_free(struct kref *kref)
 847 {
 848         struct nfs4_opendata *p = container_of(kref,
 849                         struct nfs4_opendata, kref);
 850         struct super_block *sb = p->dentry->d_sb;
 851
 852         nfs_free_seqid(p->o_arg.seqid);
 853         if (p->state != NULL)
 854                 nfs4_put_open_state(p->state);
 855         nfs4_put_state_owner(p->owner);
 856         dput(p->dir);
 857         dput(p->dentry);
 858         nfs_sb_deactive(sb);
 859         nfs_fattr_free_names(&p->f_attr);
 860         kfree(p);
 861 }
 862
 863 static void nfs4_opendata_put(struct nfs4_opendata *p)
 864 {
 865         if (p != NULL)
 866                 kref_put(&p->kref, nfs4_opendata_free);
 867 }
 868
 869 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 870 {
 871         int ret;
 872
 873         ret = rpc_wait_for_completion_task(task);
 874         return ret;
 875 }
 876
 877 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 878 {
 879         int ret = 0;
 880
 881         if (open_mode & O_EXCL)
 882                 goto out;
 883         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 884                 case FMODE_READ:
 885                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 886                                 && state->n_rdonly != 0;
 887                         break;
 888                 case FMODE_WRITE:
 889                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 890                                 && state->n_wronly != 0;
 891                         break;
 892                 case FMODE_READ|FMODE_WRITE:
 893                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 894                                 && state->n_rdwr != 0;
 895         }
 896 out:
 897         return ret;
 898 }
 899
 900 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 901 {
 902         if (delegation == NULL)
 903                 return 0;
 904         if ((delegation->type & fmode) != fmode)
 905                 return 0;
 906         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 907                 return 0;
 908         nfs_mark_delegation_referenced(delegation);
 909         return 1;
 910 }
 911
 912 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 913 {
 914         switch (fmode) {
 915                 case FMODE_WRITE:
 916                         state->n_wronly++;
 917                         break;
 918                 case FMODE_READ:
 919                         state->n_rdonly++;
 920                         break;
 921                 case FMODE_READ|FMODE_WRITE:
 922                         state->n_rdwr++;
 923         }
 924         nfs4_state_set_mode_locked(state, state->state | fmode);
 925 }
 926
 927 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 928 {
 929         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 930                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 931         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 932         switch (fmode) {
 933                 case FMODE_READ:
 934                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 935                         break;
 936                 case FMODE_WRITE:
 937                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 938                         break;
 939                 case FMODE_READ|FMODE_WRITE:
 940                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 941         }
 942 }
 943
 944 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 945 {
 946         write_seqlock(&state->seqlock);
 947         nfs_set_open_stateid_locked(state, stateid, fmode);
 948         write_sequnlock(&state->seqlock);
 949 }
 950
 951 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 952 {
 953         /*
 954          * Protect the call to nfs4_state_set_mode_locked and
 955          * serialise the stateid update
 956          */
 957         write_seqlock(&state->seqlock);
 958         if (deleg_stateid != NULL) {
 959                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 960                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 961         }
 962         if (open_stateid != NULL)
 963                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 964         write_sequnlock(&state->seqlock);
 965         spin_lock(&state->owner->so_lock);
 966         update_open_stateflags(state, fmode);
 967         spin_unlock(&state->owner->so_lock);
 968 }
 969
 970 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 971 {
 972         struct nfs_inode *nfsi = NFS_I(state->inode);
 973         struct nfs_delegation *deleg_cur;
 974         int ret = 0;
 975
 976         fmode &= (FMODE_READ|FMODE_WRITE);
 977
 978         rcu_read_lock();
 979         deleg_cur = rcu_dereference(nfsi->delegation);
 980         if (deleg_cur == NULL)
 981                 goto no_delegation;
 982
 983         spin_lock(&deleg_cur->lock);
 984         if (nfsi->delegation != deleg_cur ||
 985             (deleg_cur->type & fmode) != fmode)
 986                 goto no_delegation_unlock;
 987
 988         if (delegation == NULL)
 989                 delegation = &deleg_cur->stateid;
 990         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 991                 goto no_delegation_unlock;
 992
 993         nfs_mark_delegation_referenced(deleg_cur);
 994         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 995         ret = 1;
 996 no_delegation_unlock:
 997         spin_unlock(&deleg_cur->lock);
 998 no_delegation:
 999         rcu_read_unlock();
1000
1001         if (!ret && open_stateid != NULL) {
1002                 __update_open_stateid(state, open_stateid, NULL, fmode);
1003                 ret = 1;
1004         }
1005
1006         return ret;
1007 }
1008
1009
1010 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1011 {
1012         struct nfs_delegation *delegation;
1013
1014         rcu_read_lock();
1015         delegation = rcu_dereference(NFS_I(inode)->delegation);
1016         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1017                 rcu_read_unlock();
1018                 return;
1019         }
1020         rcu_read_unlock();
1021         nfs_inode_return_delegation(inode);
1022 }
1023
1024 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1025 {
1026         struct nfs4_state *state = opendata->state;
1027         struct nfs_inode *nfsi = NFS_I(state->inode);
1028         struct nfs_delegation *delegation;
1029         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1030         fmode_t fmode = opendata->o_arg.fmode;
1031         nfs4_stateid stateid;
1032         int ret = -EAGAIN;
1033
1034         for (;;) {
1035                 if (can_open_cached(state, fmode, open_mode)) {
1036                         spin_lock(&state->owner->so_lock);
1037                         if (can_open_cached(state, fmode, open_mode)) {
1038                                 update_open_stateflags(state, fmode);
1039                                 spin_unlock(&state->owner->so_lock);
1040                                 goto out_return_state;
1041                         }
1042                         spin_unlock(&state->owner->so_lock);
1043                 }
1044                 rcu_read_lock();
1045                 delegation = rcu_dereference(nfsi->delegation);
1046                 if (!can_open_delegated(delegation, fmode)) {
1047                         rcu_read_unlock();
1048                         break;
1049                 }
1050                 /* Save the delegation */
1051                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1052                 rcu_read_unlock();
1053                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1054                 if (ret != 0)
1055                         goto out;
1056                 ret = -EAGAIN;
1057
1058                 /* Try to update the stateid using the delegation */
1059                 if (update_open_stateid(state, NULL, &stateid, fmode))
1060                         goto out_return_state;
1061         }
1062 out:
1063         return ERR_PTR(ret);
1064 out_return_state:
1065         atomic_inc(&state->count);
1066         return state;
1067 }
1068
1069 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1070 {
1071         struct inode *inode;
1072         struct nfs4_state *state = NULL;
1073         struct nfs_delegation *delegation;
1074         int ret;
1075
1076         if (!data->rpc_done) {
1077                 state = nfs4_try_open_cached(data);
1078                 goto out;
1079         }
1080
1081         ret = -EAGAIN;
1082         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1083                 goto err;
1084         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1085         ret = PTR_ERR(inode);
1086         if (IS_ERR(inode))
1087                 goto err;
1088         ret = -ENOMEM;
1089         state = nfs4_get_open_state(inode, data->owner);
1090         if (state == NULL)
1091                 goto err_put_inode;
1092         if (data->o_res.delegation_type != 0) {
1093                 int delegation_flags = 0;
1094
1095                 rcu_read_lock();
1096                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1097                 if (delegation)
1098                         delegation_flags = delegation->flags;
1099                 rcu_read_unlock();
1100                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1101                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1102                                         "returning a delegation for "
1103                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1104                                         NFS_CLIENT(inode)->cl_server);
1105                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1106                         nfs_inode_set_delegation(state->inode,
1107                                         data->owner->so_cred,
1108                                         &data->o_res);
1109                 else
1110                         nfs_inode_reclaim_delegation(state->inode,
1111                                         data->owner->so_cred,
1112                                         &data->o_res);
1113         }
1114
1115         update_open_stateid(state, &data->o_res.stateid, NULL,
1116                         data->o_arg.fmode);
1117         iput(inode);
1118 out:
1119         return state;
1120 err_put_inode:
1121         iput(inode);
1122 err:
1123         return ERR_PTR(ret);
1124 }
1125
1126 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1127 {
1128         struct nfs_inode *nfsi = NFS_I(state->inode);
1129         struct nfs_open_context *ctx;
1130
1131         spin_lock(&state->inode->i_lock);
1132         list_for_each_entry(ctx, &nfsi->open_files, list) {
1133                 if (ctx->state != state)
1134                         continue;
1135                 get_nfs_open_context(ctx);
1136                 spin_unlock(&state->inode->i_lock);
1137                 return ctx;
1138         }
1139         spin_unlock(&state->inode->i_lock);
1140         return ERR_PTR(-ENOENT);
1141 }
1142
1143 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1144 {
1145         struct nfs4_opendata *opendata;
1146
1147         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1148         if (opendata == NULL)
1149                 return ERR_PTR(-ENOMEM);
1150         opendata->state = state;
1151         atomic_inc(&state->count);
1152         return opendata;
1153 }
1154
1155 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1156 {
1157         struct nfs4_state *newstate;
1158         int ret;
1159
1160         opendata->o_arg.open_flags = 0;
1161         opendata->o_arg.fmode = fmode;
1162         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1163         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1164         nfs4_init_opendata_res(opendata);
1165         ret = _nfs4_recover_proc_open(opendata);
1166         if (ret != 0)
1167                 return ret;
1168         newstate = nfs4_opendata_to_nfs4_state(opendata);
1169         if (IS_ERR(newstate))
1170                 return PTR_ERR(newstate);
1171         nfs4_close_state(newstate, fmode);
1172         *res = newstate;
1173         return 0;
1174 }
1175
1176 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1177 {
1178         struct nfs4_state *newstate;
1179         int ret;
1180
1181         /* memory barrier prior to reading state->n_* */
1182         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1183         smp_rmb();
1184         if (state->n_rdwr != 0) {
1185                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1186                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1187                 if (ret != 0)
1188                         return ret;
1189                 if (newstate != state)
1190                         return -ESTALE;
1191         }
1192         if (state->n_wronly != 0) {
1193                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1194                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1195                 if (ret != 0)
1196                         return ret;
1197                 if (newstate != state)
1198                         return -ESTALE;
1199         }
1200         if (state->n_rdonly != 0) {
1201                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1202                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1203                 if (ret != 0)
1204                         return ret;
1205                 if (newstate != state)
1206                         return -ESTALE;
1207         }
1208         /*
1209          * We may have performed cached opens for all three recoveries.
1210          * Check if we need to update the current stateid.
1211          */
1212         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1213             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1214                 write_seqlock(&state->seqlock);
1215                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1216                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1217                 write_sequnlock(&state->seqlock);
1218         }
1219         return 0;
1220 }
1221
1222 /*
1223  * OPEN_RECLAIM:
1224  *      reclaim state on the server after a reboot.
1225  */
1226 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1227 {
1228         struct nfs_delegation *delegation;
1229         struct nfs4_opendata *opendata;
1230         fmode_t delegation_type = 0;
1231         int status;
1232
1233         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1234         if (IS_ERR(opendata))
1235                 return PTR_ERR(opendata);
1236         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1237         opendata->o_arg.fh = NFS_FH(state->inode);
1238         rcu_read_lock();
1239         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1240         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1241                 delegation_type = delegation->type;
1242         rcu_read_unlock();
1243         opendata->o_arg.u.delegation_type = delegation_type;
1244         status = nfs4_open_recover(opendata, state);
1245         nfs4_opendata_put(opendata);
1246         return status;
1247 }
1248
1249 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1250 {
1251         struct nfs_server *server = NFS_SERVER(state->inode);
1252         struct nfs4_exception exception = { };
1253         int err;
1254         do {
1255                 err = _nfs4_do_open_reclaim(ctx, state);
1256                 if (err != -NFS4ERR_DELAY)
1257                         break;
1258                 nfs4_handle_exception(server, err, &exception);
1259         } while (exception.retry);
1260         return err;
1261 }
1262
1263 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1264 {
1265         struct nfs_open_context *ctx;
1266         int ret;
1267
1268         ctx = nfs4_state_find_open_context(state);
1269         if (IS_ERR(ctx))
1270                 return PTR_ERR(ctx);
1271         ret = nfs4_do_open_reclaim(ctx, state);
1272         put_nfs_open_context(ctx);
1273         return ret;
1274 }
1275
1276 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1277 {
1278         struct nfs4_opendata *opendata;
1279         int ret;
1280
1281         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1282         if (IS_ERR(opendata))
1283                 return PTR_ERR(opendata);
1284         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1285         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1286                         sizeof(opendata->o_arg.u.delegation.data));
1287         ret = nfs4_open_recover(opendata, state);
1288         nfs4_opendata_put(opendata);
1289         return ret;
1290 }
1291
1292 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1293 {
1294         struct nfs4_exception exception = { };
1295         struct nfs_server *server = NFS_SERVER(state->inode);
1296         int err;
1297         do {
1298                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1299                 switch (err) {
1300                         case 0:
1301                         case -ENOENT:
1302                         case -ESTALE:
1303                                 goto out;
1304                         case -NFS4ERR_BADSESSION:
1305                         case -NFS4ERR_BADSLOT:
1306                         case -NFS4ERR_BAD_HIGH_SLOT:
1307                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1308                         case -NFS4ERR_DEADSESSION:
1309                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1310                                 goto out;
1311                         case -NFS4ERR_STALE_CLIENTID:
1312                         case -NFS4ERR_STALE_STATEID:
1313                         case -NFS4ERR_EXPIRED:
1314                                 /* Don't recall a delegation if it was lost */
1315                                 nfs4_schedule_lease_recovery(server->nfs_client);
1316                                 goto out;
1317                         case -ERESTARTSYS:
1318                                 /*
1319                                  * The show must go on: exit, but mark the
1320                                  * stateid as needing recovery.
1321                                  */
1322                         case -NFS4ERR_ADMIN_REVOKED:
1323                         case -NFS4ERR_BAD_STATEID:
1324                                 nfs4_schedule_stateid_recovery(server, state);
1325                         case -EKEYEXPIRED:
1326                                 /*
1327                                  * User RPCSEC_GSS context has expired.
1328                                  * We cannot recover this stateid now, so
1329                                  * skip it and allow recovery thread to
1330                                  * proceed.
1331                                  */
1332                         case -ENOMEM:
1333                                 err = 0;
1334                                 goto out;
1335                 }
1336                 err = nfs4_handle_exception(server, err, &exception);
1337         } while (exception.retry);
1338 out:
1339         return err;
1340 }
1341
1342 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1343 {
1344         struct nfs4_opendata *data = calldata;
1345
1346         data->rpc_status = task->tk_status;
1347         if (data->rpc_status == 0) {
1348                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1349                                 sizeof(data->o_res.stateid.data));
1350                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1351                 renew_lease(data->o_res.server, data->timestamp);
1352                 data->rpc_done = 1;
1353         }
1354 }
1355
1356 static void nfs4_open_confirm_release(void *calldata)
1357 {
1358         struct nfs4_opendata *data = calldata;
1359         struct nfs4_state *state = NULL;
1360
1361         /* If this request hasn't been cancelled, do nothing */
1362         if (data->cancelled == 0)
1363                 goto out_free;
1364         /* In case of error, no cleanup! */
1365         if (!data->rpc_done)
1366                 goto out_free;
1367         state = nfs4_opendata_to_nfs4_state(data);
1368         if (!IS_ERR(state))
1369                 nfs4_close_state(state, data->o_arg.fmode);
1370 out_free:
1371         nfs4_opendata_put(data);
1372 }
1373
1374 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1375         .rpc_call_done = nfs4_open_confirm_done,
1376         .rpc_release = nfs4_open_confirm_release,
1377 };
1378
1379 /*
1380  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1381  */
1382 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1383 {
1384         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1385         struct rpc_task *task;
1386         struct  rpc_message msg = {
1387                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1388                 .rpc_argp = &data->c_arg,
1389                 .rpc_resp = &data->c_res,
1390                 .rpc_cred = data->owner->so_cred,
1391         };
1392         struct rpc_task_setup task_setup_data = {
1393                 .rpc_client = server->client,
1394                 .rpc_message = &msg,
1395                 .callback_ops = &nfs4_open_confirm_ops,
1396                 .callback_data = data,
1397                 .workqueue = nfsiod_workqueue,
1398                 .flags = RPC_TASK_ASYNC,
1399         };
1400         int status;
1401
1402         kref_get(&data->kref);
1403         data->rpc_done = 0;
1404         data->rpc_status = 0;
1405         data->timestamp = jiffies;
1406         task = rpc_run_task(&task_setup_data);
1407         if (IS_ERR(task))
1408                 return PTR_ERR(task);
1409         status = nfs4_wait_for_completion_rpc_task(task);
1410         if (status != 0) {
1411                 data->cancelled = 1;
1412                 smp_wmb();
1413         } else
1414                 status = data->rpc_status;
1415         rpc_put_task(task);
1416         return status;
1417 }
1418
1419 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1420 {
1421         struct nfs4_opendata *data = calldata;
1422         struct nfs4_state_owner *sp = data->owner;
1423
1424         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1425                 return;
1426         /*
1427          * Check if we still need to send an OPEN call, or if we can use
1428          * a delegation instead.
1429          */
1430         if (data->state != NULL) {
1431                 struct nfs_delegation *delegation;
1432
1433                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1434                         goto out_no_action;
1435                 rcu_read_lock();
1436                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1437                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1438                     can_open_delegated(delegation, data->o_arg.fmode))
1439                         goto unlock_no_action;
1440                 rcu_read_unlock();
1441         }
1442         /* Update sequence id. */
1443         data->o_arg.id = sp->so_owner_id.id;
1444         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1445         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1446                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1447                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1448         }
1449         data->timestamp = jiffies;
1450         if (nfs4_setup_sequence(data->o_arg.server,
1451                                 &data->o_arg.seq_args,
1452                                 &data->o_res.seq_res, 1, task))
1453                 return;
1454         rpc_call_start(task);
1455         return;
1456 unlock_no_action:
1457         rcu_read_unlock();
1458 out_no_action:
1459         task->tk_action = NULL;
1460
1461 }
1462
1463 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1464 {
1465         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1466         nfs4_open_prepare(task, calldata);
1467 }
1468
1469 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1470 {
1471         struct nfs4_opendata *data = calldata;
1472
1473         data->rpc_status = task->tk_status;
1474
1475         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1476                 return;
1477
1478         if (task->tk_status == 0) {
1479                 switch (data->o_res.f_attr->mode & S_IFMT) {
1480                         case S_IFREG:
1481                                 break;
1482                         case S_IFLNK:
1483                                 data->rpc_status = -ELOOP;
1484                                 break;
1485                         case S_IFDIR:
1486                                 data->rpc_status = -EISDIR;
1487                                 break;
1488                         default:
1489                                 data->rpc_status = -ENOTDIR;
1490                 }
1491                 renew_lease(data->o_res.server, data->timestamp);
1492                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1493                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1494         }
1495         data->rpc_done = 1;
1496 }
1497
1498 static void nfs4_open_release(void *calldata)
1499 {
1500         struct nfs4_opendata *data = calldata;
1501         struct nfs4_state *state = NULL;
1502
1503         /* If this request hasn't been cancelled, do nothing */
1504         if (data->cancelled == 0)
1505                 goto out_free;
1506         /* In case of error, no cleanup! */
1507         if (data->rpc_status != 0 || !data->rpc_done)
1508                 goto out_free;
1509         /* In case we need an open_confirm, no cleanup! */
1510         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1511                 goto out_free;
1512         state = nfs4_opendata_to_nfs4_state(data);
1513         if (!IS_ERR(state))
1514                 nfs4_close_state(state, data->o_arg.fmode);
1515 out_free:
1516         nfs4_opendata_put(data);
1517 }
1518
1519 static const struct rpc_call_ops nfs4_open_ops = {
1520         .rpc_call_prepare = nfs4_open_prepare,
1521         .rpc_call_done = nfs4_open_done,
1522         .rpc_release = nfs4_open_release,
1523 };
1524
1525 static const struct rpc_call_ops nfs4_recover_open_ops = {
1526         .rpc_call_prepare = nfs4_recover_open_prepare,
1527         .rpc_call_done = nfs4_open_done,
1528         .rpc_release = nfs4_open_release,
1529 };
1530
1531 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1532 {
1533         struct inode *dir = data->dir->d_inode;
1534         struct nfs_server *server = NFS_SERVER(dir);
1535         struct nfs_openargs *o_arg = &data->o_arg;
1536         struct nfs_openres *o_res = &data->o_res;
1537         struct rpc_task *task;
1538         struct rpc_message msg = {
1539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1540                 .rpc_argp = o_arg,
1541                 .rpc_resp = o_res,
1542                 .rpc_cred = data->owner->so_cred,
1543         };
1544         struct rpc_task_setup task_setup_data = {
1545                 .rpc_client = server->client,
1546                 .rpc_message = &msg,
1547                 .callback_ops = &nfs4_open_ops,
1548                 .callback_data = data,
1549                 .workqueue = nfsiod_workqueue,
1550                 .flags = RPC_TASK_ASYNC,
1551         };
1552         int status;
1553
1554         kref_get(&data->kref);
1555         data->rpc_done = 0;
1556         data->rpc_status = 0;
1557         data->cancelled = 0;
1558         if (isrecover)
1559                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1560         task = rpc_run_task(&task_setup_data);
1561         if (IS_ERR(task))
1562                 return PTR_ERR(task);
1563         status = nfs4_wait_for_completion_rpc_task(task);
1564         if (status != 0) {
1565                 data->cancelled = 1;
1566                 smp_wmb();
1567         } else
1568                 status = data->rpc_status;
1569         rpc_put_task(task);
1570
1571         return status;
1572 }
1573
1574 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1575 {
1576         struct inode *dir = data->dir->d_inode;
1577         struct nfs_openres *o_res = &data->o_res;
1578         int status;
1579
1580         status = nfs4_run_open_task(data, 1);
1581         if (status != 0 || !data->rpc_done)
1582                 return status;
1583
1584         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1585
1586         nfs_refresh_inode(dir, o_res->dir_attr);
1587
1588         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1589                 status = _nfs4_proc_open_confirm(data);
1590                 if (status != 0)
1591                         return status;
1592         }
1593
1594         return status;
1595 }
1596
1597 /*
1598  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1599  */
1600 static int _nfs4_proc_open(struct nfs4_opendata *data)
1601 {
1602         struct inode *dir = data->dir->d_inode;
1603         struct nfs_server *server = NFS_SERVER(dir);
1604         struct nfs_openargs *o_arg = &data->o_arg;
1605         struct nfs_openres *o_res = &data->o_res;
1606         int status;
1607
1608         status = nfs4_run_open_task(data, 0);
1609         if (!data->rpc_done)
1610                 return status;
1611         if (status != 0) {
1612                 if (status == -NFS4ERR_BADNAME &&
1613                                 !(o_arg->open_flags & O_CREAT))
1614                         return -ENOENT;
1615                 return status;
1616         }
1617
1618         nfs_fattr_map_and_free_names(server, &data->f_attr);
1619
1620         if (o_arg->open_flags & O_CREAT) {
1621                 update_changeattr(dir, &o_res->cinfo);
1622                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1623         } else
1624                 nfs_refresh_inode(dir, o_res->dir_attr);
1625         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1626                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1627         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1628                 status = _nfs4_proc_open_confirm(data);
1629                 if (status != 0)
1630                         return status;
1631         }
1632         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1633                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1634         return 0;
1635 }
1636
1637 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1638 {
1639         unsigned int loop;
1640         int ret;
1641
1642         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1643                 ret = nfs4_wait_clnt_recover(clp);
1644                 if (ret != 0)
1645                         break;
1646                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1647                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1648                         break;
1649                 nfs4_schedule_state_manager(clp);
1650                 ret = -EIO;
1651         }
1652         return ret;
1653 }
1654
1655 static int nfs4_recover_expired_lease(struct nfs_server *server)
1656 {
1657         return nfs4_client_recover_expired_lease(server->nfs_client);
1658 }
1659
1660 /*
1661  * OPEN_EXPIRED:
1662  *      reclaim state on the server after a network partition.
1663  *      Assumes caller holds the appropriate lock
1664  */
1665 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1666 {
1667         struct nfs4_opendata *opendata;
1668         int ret;
1669
1670         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1671         if (IS_ERR(opendata))
1672                 return PTR_ERR(opendata);
1673         ret = nfs4_open_recover(opendata, state);
1674         if (ret == -ESTALE)
1675                 d_drop(ctx->dentry);
1676         nfs4_opendata_put(opendata);
1677         return ret;
1678 }
1679
1680 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1681 {
1682         struct nfs_server *server = NFS_SERVER(state->inode);
1683         struct nfs4_exception exception = { };
1684         int err;
1685
1686         do {
1687                 err = _nfs4_open_expired(ctx, state);
1688                 switch (err) {
1689                 default:
1690                         goto out;
1691                 case -NFS4ERR_GRACE:
1692                 case -NFS4ERR_DELAY:
1693                         nfs4_handle_exception(server, err, &exception);
1694                         err = 0;
1695                 }
1696         } while (exception.retry);
1697 out:
1698         return err;
1699 }
1700
1701 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1702 {
1703         struct nfs_open_context *ctx;
1704         int ret;
1705
1706         ctx = nfs4_state_find_open_context(state);
1707         if (IS_ERR(ctx))
1708                 return PTR_ERR(ctx);
1709         ret = nfs4_do_open_expired(ctx, state);
1710         put_nfs_open_context(ctx);
1711         return ret;
1712 }
1713
1714 #if defined(CONFIG_NFS_V4_1)
1715 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1716 {
1717         int status;
1718         struct nfs_server *server = NFS_SERVER(state->inode);
1719
1720         status = nfs41_test_stateid(server, state);
1721         if (status == NFS_OK)
1722                 return 0;
1723         nfs41_free_stateid(server, state);
1724         return nfs4_open_expired(sp, state);
1725 }
1726 #endif
1727
1728 /*
1729  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1730  * fields corresponding to attributes that were used to store the verifier.
1731  * Make sure we clobber those fields in the later setattr call
1732  */
1733 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1734 {
1735         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1736             !(sattr->ia_valid & ATTR_ATIME_SET))
1737                 sattr->ia_valid |= ATTR_ATIME;
1738
1739         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1740             !(sattr->ia_valid & ATTR_MTIME_SET))
1741                 sattr->ia_valid |= ATTR_MTIME;
1742 }
1743
1744 /*
1745  * Returns a referenced nfs4_state
1746  */
1747 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)
1748 {
1749         struct nfs4_state_owner  *sp;
1750         struct nfs4_state     *state = NULL;
1751         struct nfs_server       *server = NFS_SERVER(dir);
1752         struct nfs4_opendata *opendata;
1753         int status;
1754
1755         /* Protect against reboot recovery conflicts */
1756         status = -ENOMEM;
1757         if (!(sp = nfs4_get_state_owner(server, cred))) {
1758                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1759                 goto out_err;
1760         }
1761         status = nfs4_recover_expired_lease(server);
1762         if (status != 0)
1763                 goto err_put_state_owner;
1764         if (dentry->d_inode != NULL)
1765                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1766         status = -ENOMEM;
1767         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1768         if (opendata == NULL)
1769                 goto err_put_state_owner;
1770
1771         if (dentry->d_inode != NULL)
1772                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1773
1774         status = _nfs4_proc_open(opendata);
1775         if (status != 0)
1776                 goto err_opendata_put;
1777
1778         state = nfs4_opendata_to_nfs4_state(opendata);
1779         status = PTR_ERR(state);
1780         if (IS_ERR(state))
1781                 goto err_opendata_put;
1782         if (server->caps & NFS_CAP_POSIX_LOCK)
1783                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1784
1785         if (opendata->o_arg.open_flags & O_EXCL) {
1786                 nfs4_exclusive_attrset(opendata, sattr);
1787
1788                 nfs_fattr_init(opendata->o_res.f_attr);
1789                 status = nfs4_do_setattr(state->inode, cred,
1790                                 opendata->o_res.f_attr, sattr,
1791                                 state);
1792                 if (status == 0)
1793                         nfs_setattr_update_inode(state->inode, sattr);
1794                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1795         }
1796         nfs4_opendata_put(opendata);
1797         nfs4_put_state_owner(sp);
1798         *res = state;
1799         return 0;
1800 err_opendata_put:
1801         nfs4_opendata_put(opendata);
1802 err_put_state_owner:
1803         nfs4_put_state_owner(sp);
1804 out_err:
1805         *res = NULL;
1806         return status;
1807 }
1808
1809
1810 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)
1811 {
1812         struct nfs4_exception exception = { };
1813         struct nfs4_state *res;
1814         int status;
1815
1816         do {
1817                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1818                 if (status == 0)
1819                         break;
1820                 /* NOTE: BAD_SEQID means the server and client disagree about the
1821                  * book-keeping w.r.t. state-changing operations
1822                  * (OPEN/CLOSE/LOCK/LOCKU...)
1823                  * It is actually a sign of a bug on the client or on the server.
1824                  *
1825                  * If we receive a BAD_SEQID error in the particular case of
1826                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1827                  * have unhashed the old state_owner for us, and that we can
1828                  * therefore safely retry using a new one. We should still warn
1829                  * the user though...
1830                  */
1831                 if (status == -NFS4ERR_BAD_SEQID) {
1832                         printk(KERN_WARNING "NFS: v4 server %s "
1833                                         " returned a bad sequence-id error!\n",
1834                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1835                         exception.retry = 1;
1836                         continue;
1837                 }
1838                 /*
1839                  * BAD_STATEID on OPEN means that the server cancelled our
1840                  * state before it received the OPEN_CONFIRM.
1841                  * Recover by retrying the request as per the discussion
1842                  * on Page 181 of RFC3530.
1843                  */
1844                 if (status == -NFS4ERR_BAD_STATEID) {
1845                         exception.retry = 1;
1846                         continue;
1847                 }
1848                 if (status == -EAGAIN) {
1849                         /* We must have found a delegation */
1850                         exception.retry = 1;
1851                         continue;
1852                 }
1853                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1854                                         status, &exception));
1855         } while (exception.retry);
1856         return res;
1857 }
1858
1859 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1860                             struct nfs_fattr *fattr, struct iattr *sattr,
1861                             struct nfs4_state *state)
1862 {
1863         struct nfs_server *server = NFS_SERVER(inode);
1864         struct nfs_setattrargs  arg = {
1865                 .fh             = NFS_FH(inode),
1866                 .iap            = sattr,
1867                 .server         = server,
1868                 .bitmask = server->attr_bitmask,
1869         };
1870         struct nfs_setattrres  res = {
1871                 .fattr          = fattr,
1872                 .server         = server,
1873         };
1874         struct rpc_message msg = {
1875                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1876                 .rpc_argp       = &arg,
1877                 .rpc_resp       = &res,
1878                 .rpc_cred       = cred,
1879         };
1880         unsigned long timestamp = jiffies;
1881         int status;
1882
1883         nfs_fattr_init(fattr);
1884
1885         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1886                 /* Use that stateid */
1887         } else if (state != NULL) {
1888                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1889         } else
1890                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1891
1892         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1893         if (status == 0 && state != NULL)
1894                 renew_lease(server, timestamp);
1895         return status;
1896 }
1897
1898 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1899                            struct nfs_fattr *fattr, struct iattr *sattr,
1900                            struct nfs4_state *state)
1901 {
1902         struct nfs_server *server = NFS_SERVER(inode);
1903         struct nfs4_exception exception = { };
1904         int err;
1905         do {
1906                 err = nfs4_handle_exception(server,
1907                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1908                                 &exception);
1909         } while (exception.retry);
1910         return err;
1911 }
1912
1913 struct nfs4_closedata {
1914         struct inode *inode;
1915         struct nfs4_state *state;
1916         struct nfs_closeargs arg;
1917         struct nfs_closeres res;
1918         struct nfs_fattr fattr;
1919         unsigned long timestamp;
1920         bool roc;
1921         u32 roc_barrier;
1922 };
1923
1924 static void nfs4_free_closedata(void *data)
1925 {
1926         struct nfs4_closedata *calldata = data;
1927         struct nfs4_state_owner *sp = calldata->state->owner;
1928         struct super_block *sb = calldata->state->inode->i_sb;
1929
1930         if (calldata->roc)
1931                 pnfs_roc_release(calldata->state->inode);
1932         nfs4_put_open_state(calldata->state);
1933         nfs_free_seqid(calldata->arg.seqid);
1934         nfs4_put_state_owner(sp);
1935         nfs_sb_deactive(sb);
1936         kfree(calldata);
1937 }
1938
1939 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1940                 fmode_t fmode)
1941 {
1942         spin_lock(&state->owner->so_lock);
1943         if (!(fmode & FMODE_READ))
1944                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1945         if (!(fmode & FMODE_WRITE))
1946                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1947         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1948         spin_unlock(&state->owner->so_lock);
1949 }
1950
1951 static void nfs4_close_done(struct rpc_task *task, void *data)
1952 {
1953         struct nfs4_closedata *calldata = data;
1954         struct nfs4_state *state = calldata->state;
1955         struct nfs_server *server = NFS_SERVER(calldata->inode);
1956
1957         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1958                 return;
1959         /* hmm. we are done with the inode, and in the process of freeing
1960          * the state_owner. we keep this around to process errors
1961          */
1962         switch (task->tk_status) {
1963                 case 0:
1964                         if (calldata->roc)
1965                                 pnfs_roc_set_barrier(state->inode,
1966                                                      calldata->roc_barrier);
1967                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1968                         renew_lease(server, calldata->timestamp);
1969                         nfs4_close_clear_stateid_flags(state,
1970                                         calldata->arg.fmode);
1971                         break;
1972                 case -NFS4ERR_STALE_STATEID:
1973                 case -NFS4ERR_OLD_STATEID:
1974                 case -NFS4ERR_BAD_STATEID:
1975                 case -NFS4ERR_EXPIRED:
1976                         if (calldata->arg.fmode == 0)
1977                                 break;
1978                 default:
1979                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1980                                 rpc_restart_call_prepare(task);
1981         }
1982         nfs_release_seqid(calldata->arg.seqid);
1983         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1984 }
1985
1986 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1987 {
1988         struct nfs4_closedata *calldata = data;
1989         struct nfs4_state *state = calldata->state;
1990         int call_close = 0;
1991
1992         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1993                 return;
1994
1995         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1996         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1997         spin_lock(&state->owner->so_lock);
1998         /* Calculate the change in open mode */
1999         if (state->n_rdwr == 0) {
2000                 if (state->n_rdonly == 0) {
2001                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2002                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2003                         calldata->arg.fmode &= ~FMODE_READ;
2004                 }
2005                 if (state->n_wronly == 0) {
2006                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2007                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2008                         calldata->arg.fmode &= ~FMODE_WRITE;
2009                 }
2010         }
2011         spin_unlock(&state->owner->so_lock);
2012
2013         if (!call_close) {
2014                 /* Note: exit _without_ calling nfs4_close_done */
2015                 task->tk_action = NULL;
2016                 return;
2017         }
2018
2019         if (calldata->arg.fmode == 0) {
2020                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2021                 if (calldata->roc &&
2022                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2023                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2024                                      task, NULL);
2025                         return;
2026                 }
2027         }
2028
2029         nfs_fattr_init(calldata->res.fattr);
2030         calldata->timestamp = jiffies;
2031         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2032                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2033                                 1, task))
2034                 return;
2035         rpc_call_start(task);
2036 }
2037
2038 static const struct rpc_call_ops nfs4_close_ops = {
2039         .rpc_call_prepare = nfs4_close_prepare,
2040         .rpc_call_done = nfs4_close_done,
2041         .rpc_release = nfs4_free_closedata,
2042 };
2043
2044 /*
2045  * It is possible for data to be read/written from a mem-mapped file
2046  * after the sys_close call (which hits the vfs layer as a flush).
2047  * This means that we can't safely call nfsv4 close on a file until
2048  * the inode is cleared. This in turn means that we are not good
2049  * NFSv4 citizens - we do not indicate to the server to update the file's
2050  * share state even when we are done with one of the three share
2051  * stateid's in the inode.
2052  *
2053  * NOTE: Caller must be holding the sp->so_owner semaphore!
2054  */
2055 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2056 {
2057         struct nfs_server *server = NFS_SERVER(state->inode);
2058         struct nfs4_closedata *calldata;
2059         struct nfs4_state_owner *sp = state->owner;
2060         struct rpc_task *task;
2061         struct rpc_message msg = {
2062                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2063                 .rpc_cred = state->owner->so_cred,
2064         };
2065         struct rpc_task_setup task_setup_data = {
2066                 .rpc_client = server->client,
2067                 .rpc_message = &msg,
2068                 .callback_ops = &nfs4_close_ops,
2069                 .workqueue = nfsiod_workqueue,
2070                 .flags = RPC_TASK_ASYNC,
2071         };
2072         int status = -ENOMEM;
2073
2074         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2075         if (calldata == NULL)
2076                 goto out;
2077         calldata->inode = state->inode;
2078         calldata->state = state;
2079         calldata->arg.fh = NFS_FH(state->inode);
2080         calldata->arg.stateid = &state->open_stateid;
2081         /* Serialization for the sequence id */
2082         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2083         if (calldata->arg.seqid == NULL)
2084                 goto out_free_calldata;
2085         calldata->arg.fmode = 0;
2086         calldata->arg.bitmask = server->cache_consistency_bitmask;
2087         calldata->res.fattr = &calldata->fattr;
2088         calldata->res.seqid = calldata->arg.seqid;
2089         calldata->res.server = server;
2090         calldata->roc = roc;
2091         nfs_sb_active(calldata->inode->i_sb);
2092
2093         msg.rpc_argp = &calldata->arg;
2094         msg.rpc_resp = &calldata->res;
2095         task_setup_data.callback_data = calldata;
2096         task = rpc_run_task(&task_setup_data);
2097         if (IS_ERR(task))
2098                 return PTR_ERR(task);
2099         status = 0;
2100         if (wait)
2101                 status = rpc_wait_for_completion_task(task);
2102         rpc_put_task(task);
2103         return status;
2104 out_free_calldata:
2105         kfree(calldata);
2106 out:
2107         if (roc)
2108                 pnfs_roc_release(state->inode);
2109         nfs4_put_open_state(state);
2110         nfs4_put_state_owner(sp);
2111         return status;
2112 }
2113
2114 static struct inode *
2115 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2116 {
2117         struct nfs4_state *state;
2118
2119         /* Protect against concurrent sillydeletes */
2120         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2121         if (IS_ERR(state))
2122                 return ERR_CAST(state);
2123         ctx->state = state;
2124         return igrab(state->inode);
2125 }
2126
2127 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2128 {
2129         if (ctx->state == NULL)
2130                 return;
2131         if (is_sync)
2132                 nfs4_close_sync(ctx->state, ctx->mode);
2133         else
2134                 nfs4_close_state(ctx->state, ctx->mode);
2135 }
2136
2137 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2138 {
2139         struct nfs4_server_caps_arg args = {
2140                 .fhandle = fhandle,
2141         };
2142         struct nfs4_server_caps_res res = {};
2143         struct rpc_message msg = {
2144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2145                 .rpc_argp = &args,
2146                 .rpc_resp = &res,
2147         };
2148         int status;
2149
2150         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2151         if (status == 0) {
2152                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2153                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2154                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2155                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2156                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2157                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2158                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2159                         server->caps |= NFS_CAP_ACLS;
2160                 if (res.has_links != 0)
2161                         server->caps |= NFS_CAP_HARDLINKS;
2162                 if (res.has_symlinks != 0)
2163                         server->caps |= NFS_CAP_SYMLINKS;
2164                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2165                         server->caps |= NFS_CAP_FILEID;
2166                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2167                         server->caps |= NFS_CAP_MODE;
2168                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2169                         server->caps |= NFS_CAP_NLINK;
2170                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2171                         server->caps |= NFS_CAP_OWNER;
2172                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2173                         server->caps |= NFS_CAP_OWNER_GROUP;
2174                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2175                         server->caps |= NFS_CAP_ATIME;
2176                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2177                         server->caps |= NFS_CAP_CTIME;
2178                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2179                         server->caps |= NFS_CAP_MTIME;
2180
2181                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2182                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2183                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2184                 server->acl_bitmask = res.acl_bitmask;
2185         }
2186
2187         return status;
2188 }
2189
2190 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2191 {
2192         struct nfs4_exception exception = { };
2193         int err;
2194         do {
2195                 err = nfs4_handle_exception(server,
2196                                 _nfs4_server_capabilities(server, fhandle),
2197                                 &exception);
2198         } while (exception.retry);
2199         return err;
2200 }
2201
2202 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2203                 struct nfs_fsinfo *info)
2204 {
2205         struct nfs4_lookup_root_arg args = {
2206                 .bitmask = nfs4_fattr_bitmap,
2207         };
2208         struct nfs4_lookup_res res = {
2209                 .server = server,
2210                 .fattr = info->fattr,
2211                 .fh = fhandle,
2212         };
2213         struct rpc_message msg = {
2214                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2215                 .rpc_argp = &args,
2216                 .rpc_resp = &res,
2217         };
2218
2219         nfs_fattr_init(info->fattr);
2220         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2221 }
2222
2223 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2224                 struct nfs_fsinfo *info)
2225 {
2226         struct nfs4_exception exception = { };
2227         int err;
2228         do {
2229                 err = _nfs4_lookup_root(server, fhandle, info);
2230                 switch (err) {
2231                 case 0:
2232                 case -NFS4ERR_WRONGSEC:
2233                         break;
2234                 default:
2235                         err = nfs4_handle_exception(server, err, &exception);
2236                 }
2237         } while (exception.retry);
2238         return err;
2239 }
2240
2241 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2242                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2243 {
2244         struct rpc_auth *auth;
2245         int ret;
2246
2247         auth = rpcauth_create(flavor, server->client);
2248         if (!auth) {
2249                 ret = -EIO;
2250                 goto out;
2251         }
2252         ret = nfs4_lookup_root(server, fhandle, info);
2253 out:
2254         return ret;
2255 }
2256
2257 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2258                               struct nfs_fsinfo *info)
2259 {
2260         int i, len, status = 0;
2261         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2262
2263         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2264         flav_array[len] = RPC_AUTH_NULL;
2265         len += 1;
2266
2267         for (i = 0; i < len; i++) {
2268                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2269                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2270                         continue;
2271                 break;
2272         }
2273         /*
2274          * -EACCESS could mean that the user doesn't have correct permissions
2275          * to access the mount.  It could also mean that we tried to mount
2276          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2277          * existing mount programs don't handle -EACCES very well so it should
2278          * be mapped to -EPERM instead.
2279          */
2280         if (status == -EACCES)
2281                 status = -EPERM;
2282         return status;
2283 }
2284
2285 /*
2286  * get the file handle for the "/" directory on the server
2287  */
2288 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2289                               struct nfs_fsinfo *info)
2290 {
2291         int minor_version = server->nfs_client->cl_minorversion;
2292         int status = nfs4_lookup_root(server, fhandle, info);
2293         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2294                 /*
2295                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2296                  * by nfs4_map_errors() as this function exits.
2297                  */
2298                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2299         if (status == 0)
2300                 status = nfs4_server_capabilities(server, fhandle);
2301         if (status == 0)
2302                 status = nfs4_do_fsinfo(server, fhandle, info);
2303         return nfs4_map_errors(status);
2304 }
2305
2306 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2307 /*
2308  * Get locations and (maybe) other attributes of a referral.
2309  * Note that we'll actually follow the referral later when
2310  * we detect fsid mismatch in inode revalidation
2311  */
2312 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2313                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2314 {
2315         int status = -ENOMEM;
2316         struct page *page = NULL;
2317         struct nfs4_fs_locations *locations = NULL;
2318
2319         page = alloc_page(GFP_KERNEL);
2320         if (page == NULL)
2321                 goto out;
2322         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2323         if (locations == NULL)
2324                 goto out;
2325
2326         status = nfs4_proc_fs_locations(dir, name, locations, page);
2327         if (status != 0)
2328                 goto out;
2329         /* Make sure server returned a different fsid for the referral */
2330         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2331                 dprintk("%s: server did not return a different fsid for"
2332                         " a referral at %s\n", __func__, name->name);
2333                 status = -EIO;
2334                 goto out;
2335         }
2336         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2337         nfs_fixup_referral_attributes(&locations->fattr);
2338
2339         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2340         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2341         memset(fhandle, 0, sizeof(struct nfs_fh));
2342 out:
2343         if (page)
2344                 __free_page(page);
2345         kfree(locations);
2346         return status;
2347 }
2348
2349 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2350 {
2351         struct nfs4_getattr_arg args = {
2352                 .fh = fhandle,
2353                 .bitmask = server->attr_bitmask,
2354         };
2355         struct nfs4_getattr_res res = {
2356                 .fattr = fattr,
2357                 .server = server,
2358         };
2359         struct rpc_message msg = {
2360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2361                 .rpc_argp = &args,
2362                 .rpc_resp = &res,
2363         };
2364
2365         nfs_fattr_init(fattr);
2366         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2367 }
2368
2369 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2370 {
2371         struct nfs4_exception exception = { };
2372         int err;
2373         do {
2374                 err = nfs4_handle_exception(server,
2375                                 _nfs4_proc_getattr(server, fhandle, fattr),
2376                                 &exception);
2377         } while (exception.retry);
2378         return err;
2379 }
2380
2381 /*
2382  * The file is not closed if it is opened due to the a request to change
2383  * the size of the file. The open call will not be needed once the
2384  * VFS layer lookup-intents are implemented.
2385  *
2386  * Close is called when the inode is destroyed.
2387  * If we haven't opened the file for O_WRONLY, we
2388  * need to in the size_change case to obtain a stateid.
2389  *
2390  * Got race?
2391  * Because OPEN is always done by name in nfsv4, it is
2392  * possible that we opened a different file by the same
2393  * name.  We can recognize this race condition, but we
2394  * can't do anything about it besides returning an error.
2395  *
2396  * This will be fixed with VFS changes (lookup-intent).
2397  */
2398 static int
2399 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2400                   struct iattr *sattr)
2401 {
2402         struct inode *inode = dentry->d_inode;
2403         struct rpc_cred *cred = NULL;
2404         struct nfs4_state *state = NULL;
2405         int status;
2406
2407         if (pnfs_ld_layoutret_on_setattr(inode))
2408                 pnfs_return_layout(inode);
2409
2410         nfs_fattr_init(fattr);
2411
2412         /* Search for an existing open(O_WRITE) file */
2413         if (sattr->ia_valid & ATTR_FILE) {
2414                 struct nfs_open_context *ctx;
2415
2416                 ctx = nfs_file_open_context(sattr->ia_file);
2417                 if (ctx) {
2418                         cred = ctx->cred;
2419                         state = ctx->state;
2420                 }
2421         }
2422
2423         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2424         if (status == 0)
2425                 nfs_setattr_update_inode(inode, sattr);
2426         return status;
2427 }
2428
2429 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2430                 const struct qstr *name, struct nfs_fh *fhandle,
2431                 struct nfs_fattr *fattr)
2432 {
2433         struct nfs_server *server = NFS_SERVER(dir);
2434         int                    status;
2435         struct nfs4_lookup_arg args = {
2436                 .bitmask = server->attr_bitmask,
2437                 .dir_fh = NFS_FH(dir),
2438                 .name = name,
2439         };
2440         struct nfs4_lookup_res res = {
2441                 .server = server,
2442                 .fattr = fattr,
2443                 .fh = fhandle,
2444         };
2445         struct rpc_message msg = {
2446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2447                 .rpc_argp = &args,
2448                 .rpc_resp = &res,
2449         };
2450
2451         nfs_fattr_init(fattr);
2452
2453         dprintk("NFS call  lookup %s\n", name->name);
2454         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2455         dprintk("NFS reply lookup: %d\n", status);
2456         return status;
2457 }
2458
2459 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2460 {
2461         memset(fh, 0, sizeof(struct nfs_fh));
2462         fattr->fsid.major = 1;
2463         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2464                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2465         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2466         fattr->nlink = 2;
2467 }
2468
2469 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2470                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2471 {
2472         struct nfs4_exception exception = { };
2473         int err;
2474         do {
2475                 int status;
2476
2477                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2478                 switch (status) {
2479                 case -NFS4ERR_BADNAME:
2480                         return -ENOENT;
2481                 case -NFS4ERR_MOVED:
2482                         return nfs4_get_referral(dir, name, fattr, fhandle);
2483                 case -NFS4ERR_WRONGSEC:
2484                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2485                 }
2486                 err = nfs4_handle_exception(NFS_SERVER(dir),
2487                                 status, &exception);
2488         } while (exception.retry);
2489         return err;
2490 }
2491
2492 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2493 {
2494         struct nfs_server *server = NFS_SERVER(inode);
2495         struct nfs4_accessargs args = {
2496                 .fh = NFS_FH(inode),
2497                 .bitmask = server->attr_bitmask,
2498         };
2499         struct nfs4_accessres res = {
2500                 .server = server,
2501         };
2502         struct rpc_message msg = {
2503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2504                 .rpc_argp = &args,
2505                 .rpc_resp = &res,
2506                 .rpc_cred = entry->cred,
2507         };
2508         int mode = entry->mask;
2509         int status;
2510
2511         /*
2512          * Determine which access bits we want to ask for...
2513          */
2514         if (mode & MAY_READ)
2515                 args.access |= NFS4_ACCESS_READ;
2516         if (S_ISDIR(inode->i_mode)) {
2517                 if (mode & MAY_WRITE)
2518                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2519                 if (mode & MAY_EXEC)
2520                         args.access |= NFS4_ACCESS_LOOKUP;
2521         } else {
2522                 if (mode & MAY_WRITE)
2523                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2524                 if (mode & MAY_EXEC)
2525                         args.access |= NFS4_ACCESS_EXECUTE;
2526         }
2527
2528         res.fattr = nfs_alloc_fattr();
2529         if (res.fattr == NULL)
2530                 return -ENOMEM;
2531
2532         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2533         if (!status) {
2534                 entry->mask = 0;
2535                 if (res.access & NFS4_ACCESS_READ)
2536                         entry->mask |= MAY_READ;
2537                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2538                         entry->mask |= MAY_WRITE;
2539                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2540                         entry->mask |= MAY_EXEC;
2541                 nfs_refresh_inode(inode, res.fattr);
2542         }
2543         nfs_free_fattr(res.fattr);
2544         return status;
2545 }
2546
2547 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2548 {
2549         struct nfs4_exception exception = { };
2550         int err;
2551         do {
2552                 err = nfs4_handle_exception(NFS_SERVER(inode),
2553                                 _nfs4_proc_access(inode, entry),
2554                                 &exception);
2555         } while (exception.retry);
2556         return err;
2557 }
2558
2559 /*
2560  * TODO: For the time being, we don't try to get any attributes
2561  * along with any of the zero-copy operations READ, READDIR,
2562  * READLINK, WRITE.
2563  *
2564  * In the case of the first three, we want to put the GETATTR
2565  * after the read-type operation -- this is because it is hard
2566  * to predict the length of a GETATTR response in v4, and thus
2567  * align the READ data correctly.  This means that the GETATTR
2568  * may end up partially falling into the page cache, and we should
2569  * shift it into the 'tail' of the xdr_buf before processing.
2570  * To do this efficiently, we need to know the total length
2571  * of data received, which doesn't seem to be available outside
2572  * of the RPC layer.
2573  *
2574  * In the case of WRITE, we also want to put the GETATTR after
2575  * the operation -- in this case because we want to make sure
2576  * we get the post-operation mtime and size.  This means that
2577  * we can't use xdr_encode_pages() as written: we need a variant
2578  * of it which would leave room in the 'tail' iovec.
2579  *
2580  * Both of these changes to the XDR layer would in fact be quite
2581  * minor, but I decided to leave them for a subsequent patch.
2582  */
2583 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2584                 unsigned int pgbase, unsigned int pglen)
2585 {
2586         struct nfs4_readlink args = {
2587                 .fh       = NFS_FH(inode),
2588                 .pgbase   = pgbase,
2589                 .pglen    = pglen,
2590                 .pages    = &page,
2591         };
2592         struct nfs4_readlink_res res;
2593         struct rpc_message msg = {
2594                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2595                 .rpc_argp = &args,
2596                 .rpc_resp = &res,
2597         };
2598
2599         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2600 }
2601
2602 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2603                 unsigned int pgbase, unsigned int pglen)
2604 {
2605         struct nfs4_exception exception = { };
2606         int err;
2607         do {
2608                 err = nfs4_handle_exception(NFS_SERVER(inode),
2609                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2610                                 &exception);
2611         } while (exception.retry);
2612         return err;
2613 }
2614
2615 /*
2616  * Got race?
2617  * We will need to arrange for the VFS layer to provide an atomic open.
2618  * Until then, this create/open method is prone to inefficiency and race
2619  * conditions due to the lookup, create, and open VFS calls from sys_open()
2620  * placed on the wire.
2621  *
2622  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2623  * The file will be opened again in the subsequent VFS open call
2624  * (nfs4_proc_file_open).
2625  *
2626  * The open for read will just hang around to be used by any process that
2627  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2628  */
2629
2630 static int
2631 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2632                  int flags, struct nfs_open_context *ctx)
2633 {
2634         struct dentry *de = dentry;
2635         struct nfs4_state *state;
2636         struct rpc_cred *cred = NULL;
2637         fmode_t fmode = 0;
2638         int status = 0;
2639
2640         if (ctx != NULL) {
2641                 cred = ctx->cred;
2642                 de = ctx->dentry;
2643                 fmode = ctx->mode;
2644         }
2645         sattr->ia_mode &= ~current_umask();
2646         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2647         d_drop(dentry);
2648         if (IS_ERR(state)) {
2649                 status = PTR_ERR(state);
2650                 goto out;
2651         }
2652         d_add(dentry, igrab(state->inode));
2653         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2654         if (ctx != NULL)
2655                 ctx->state = state;
2656         else
2657                 nfs4_close_sync(state, fmode);
2658 out:
2659         return status;
2660 }
2661
2662 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2663 {
2664         struct nfs_server *server = NFS_SERVER(dir);
2665         struct nfs_removeargs args = {
2666                 .fh = NFS_FH(dir),
2667                 .name.len = name->len,
2668                 .name.name = name->name,
2669                 .bitmask = server->attr_bitmask,
2670         };
2671         struct nfs_removeres res = {
2672                 .server = server,
2673         };
2674         struct rpc_message msg = {
2675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2676                 .rpc_argp = &args,
2677                 .rpc_resp = &res,
2678         };
2679         int status = -ENOMEM;
2680
2681         res.dir_attr = nfs_alloc_fattr();
2682         if (res.dir_attr == NULL)
2683                 goto out;
2684
2685         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2686         if (status == 0) {
2687                 update_changeattr(dir, &res.cinfo);
2688                 nfs_post_op_update_inode(dir, res.dir_attr);
2689         }
2690         nfs_free_fattr(res.dir_attr);
2691 out:
2692         return status;
2693 }
2694
2695 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2696 {
2697         struct nfs4_exception exception = { };
2698         int err;
2699         do {
2700                 err = nfs4_handle_exception(NFS_SERVER(dir),
2701                                 _nfs4_proc_remove(dir, name),
2702                                 &exception);
2703         } while (exception.retry);
2704         return err;
2705 }
2706
2707 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2708 {
2709         struct nfs_server *server = NFS_SERVER(dir);
2710         struct nfs_removeargs *args = msg->rpc_argp;
2711         struct nfs_removeres *res = msg->rpc_resp;
2712
2713         args->bitmask = server->cache_consistency_bitmask;
2714         res->server = server;
2715         res->seq_res.sr_slot = NULL;
2716         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2717 }
2718
2719 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2720 {
2721         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2722
2723         if (!nfs4_sequence_done(task, &res->seq_res))
2724                 return 0;
2725         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2726                 return 0;
2727         update_changeattr(dir, &res->cinfo);
2728         nfs_post_op_update_inode(dir, res->dir_attr);
2729         return 1;
2730 }
2731
2732 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2733 {
2734         struct nfs_server *server = NFS_SERVER(dir);
2735         struct nfs_renameargs *arg = msg->rpc_argp;
2736         struct nfs_renameres *res = msg->rpc_resp;
2737
2738         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2739         arg->bitmask = server->attr_bitmask;
2740         res->server = server;
2741 }
2742
2743 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2744                                  struct inode *new_dir)
2745 {
2746         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2747
2748         if (!nfs4_sequence_done(task, &res->seq_res))
2749                 return 0;
2750         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2751                 return 0;
2752
2753         update_changeattr(old_dir, &res->old_cinfo);
2754         nfs_post_op_update_inode(old_dir, res->old_fattr);
2755         update_changeattr(new_dir, &res->new_cinfo);
2756         nfs_post_op_update_inode(new_dir, res->new_fattr);
2757         return 1;
2758 }
2759
2760 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2761                 struct inode *new_dir, struct qstr *new_name)
2762 {
2763         struct nfs_server *server = NFS_SERVER(old_dir);
2764         struct nfs_renameargs arg = {
2765                 .old_dir = NFS_FH(old_dir),
2766                 .new_dir = NFS_FH(new_dir),
2767                 .old_name = old_name,
2768                 .new_name = new_name,
2769                 .bitmask = server->attr_bitmask,
2770         };
2771         struct nfs_renameres res = {
2772                 .server = server,
2773         };
2774         struct rpc_message msg = {
2775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2776                 .rpc_argp = &arg,
2777                 .rpc_resp = &res,
2778         };
2779         int status = -ENOMEM;
2780
2781         res.old_fattr = nfs_alloc_fattr();
2782         res.new_fattr = nfs_alloc_fattr();
2783         if (res.old_fattr == NULL || res.new_fattr == NULL)
2784                 goto out;
2785
2786         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2787         if (!status) {
2788                 update_changeattr(old_dir, &res.old_cinfo);
2789                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2790                 update_changeattr(new_dir, &res.new_cinfo);
2791                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2792         }
2793 out:
2794         nfs_free_fattr(res.new_fattr);
2795         nfs_free_fattr(res.old_fattr);
2796         return status;
2797 }
2798
2799 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2800                 struct inode *new_dir, struct qstr *new_name)
2801 {
2802         struct nfs4_exception exception = { };
2803         int err;
2804         do {
2805                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2806                                 _nfs4_proc_rename(old_dir, old_name,
2807                                         new_dir, new_name),
2808                                 &exception);
2809         } while (exception.retry);
2810         return err;
2811 }
2812
2813 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2814 {
2815         struct nfs_server *server = NFS_SERVER(inode);
2816         struct nfs4_link_arg arg = {
2817                 .fh     = NFS_FH(inode),
2818                 .dir_fh = NFS_FH(dir),
2819                 .name   = name,
2820                 .bitmask = server->attr_bitmask,
2821         };
2822         struct nfs4_link_res res = {
2823                 .server = server,
2824         };
2825         struct rpc_message msg = {
2826                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2827                 .rpc_argp = &arg,
2828                 .rpc_resp = &res,
2829         };
2830         int status = -ENOMEM;
2831
2832         res.fattr = nfs_alloc_fattr();
2833         res.dir_attr = nfs_alloc_fattr();
2834         if (res.fattr == NULL || res.dir_attr == NULL)
2835                 goto out;
2836
2837         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2838         if (!status) {
2839                 update_changeattr(dir, &res.cinfo);
2840                 nfs_post_op_update_inode(dir, res.dir_attr);
2841                 nfs_post_op_update_inode(inode, res.fattr);
2842         }
2843 out:
2844         nfs_free_fattr(res.dir_attr);
2845         nfs_free_fattr(res.fattr);
2846         return status;
2847 }
2848
2849 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2850 {
2851         struct nfs4_exception exception = { };
2852         int err;
2853         do {
2854                 err = nfs4_handle_exception(NFS_SERVER(inode),
2855                                 _nfs4_proc_link(inode, dir, name),
2856                                 &exception);
2857         } while (exception.retry);
2858         return err;
2859 }
2860
2861 struct nfs4_createdata {
2862         struct rpc_message msg;
2863         struct nfs4_create_arg arg;
2864         struct nfs4_create_res res;
2865         struct nfs_fh fh;
2866         struct nfs_fattr fattr;
2867         struct nfs_fattr dir_fattr;
2868 };
2869
2870 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2871                 struct qstr *name, struct iattr *sattr, u32 ftype)
2872 {
2873         struct nfs4_createdata *data;
2874
2875         data = kzalloc(sizeof(*data), GFP_KERNEL);
2876         if (data != NULL) {
2877                 struct nfs_server *server = NFS_SERVER(dir);
2878
2879                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2880                 data->msg.rpc_argp = &data->arg;
2881                 data->msg.rpc_resp = &data->res;
2882                 data->arg.dir_fh = NFS_FH(dir);
2883                 data->arg.server = server;
2884                 data->arg.name = name;
2885                 data->arg.attrs = sattr;
2886                 data->arg.ftype = ftype;
2887                 data->arg.bitmask = server->attr_bitmask;
2888                 data->res.server = server;
2889                 data->res.fh = &data->fh;
2890                 data->res.fattr = &data->fattr;
2891                 data->res.dir_fattr = &data->dir_fattr;
2892                 nfs_fattr_init(data->res.fattr);
2893                 nfs_fattr_init(data->res.dir_fattr);
2894         }
2895         return data;
2896 }
2897
2898 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2899 {
2900         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2901                                     &data->arg.seq_args, &data->res.seq_res, 1);
2902         if (status == 0) {
2903                 update_changeattr(dir, &data->res.dir_cinfo);
2904                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2905                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2906         }
2907         return status;
2908 }
2909
2910 static void nfs4_free_createdata(struct nfs4_createdata *data)
2911 {
2912         kfree(data);
2913 }
2914
2915 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2916                 struct page *page, unsigned int len, struct iattr *sattr)
2917 {
2918         struct nfs4_createdata *data;
2919         int status = -ENAMETOOLONG;
2920
2921         if (len > NFS4_MAXPATHLEN)
2922                 goto out;
2923
2924         status = -ENOMEM;
2925         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2926         if (data == NULL)
2927                 goto out;
2928
2929         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2930         data->arg.u.symlink.pages = &page;
2931         data->arg.u.symlink.len = len;
2932
2933         status = nfs4_do_create(dir, dentry, data);
2934
2935         nfs4_free_createdata(data);
2936 out:
2937         return status;
2938 }
2939
2940 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2941                 struct page *page, unsigned int len, struct iattr *sattr)
2942 {
2943         struct nfs4_exception exception = { };
2944         int err;
2945         do {
2946                 err = nfs4_handle_exception(NFS_SERVER(dir),
2947                                 _nfs4_proc_symlink(dir, dentry, page,
2948                                                         len, sattr),
2949                                 &exception);
2950         } while (exception.retry);
2951         return err;
2952 }
2953
2954 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2955                 struct iattr *sattr)
2956 {
2957         struct nfs4_createdata *data;
2958         int status = -ENOMEM;
2959
2960         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2961         if (data == NULL)
2962                 goto out;
2963
2964         status = nfs4_do_create(dir, dentry, data);
2965
2966         nfs4_free_createdata(data);
2967 out:
2968         return status;
2969 }
2970
2971 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2972                 struct iattr *sattr)
2973 {
2974         struct nfs4_exception exception = { };
2975         int err;
2976
2977         sattr->ia_mode &= ~current_umask();
2978         do {
2979                 err = nfs4_handle_exception(NFS_SERVER(dir),
2980                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2981                                 &exception);
2982         } while (exception.retry);
2983         return err;
2984 }
2985
2986 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2987                 u64 cookie, struct page **pages, unsigned int count, int plus)
2988 {
2989         struct inode            *dir = dentry->d_inode;
2990         struct nfs4_readdir_arg args = {
2991                 .fh = NFS_FH(dir),
2992                 .pages = pages,
2993                 .pgbase = 0,
2994                 .count = count,
2995                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2996                 .plus = plus,
2997         };
2998         struct nfs4_readdir_res res;
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3001                 .rpc_argp = &args,
3002                 .rpc_resp = &res,
3003                 .rpc_cred = cred,
3004         };
3005         int                     status;
3006
3007         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3008                         dentry->d_parent->d_name.name,
3009                         dentry->d_name.name,
3010                         (unsigned long long)cookie);
3011         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3012         res.pgbase = args.pgbase;
3013         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3014         if (status >= 0) {
3015                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3016                 status += args.pgbase;
3017         }
3018
3019         nfs_invalidate_atime(dir);
3020
3021         dprintk("%s: returns %d\n", __func__, status);
3022         return status;
3023 }
3024
3025 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3026                 u64 cookie, struct page **pages, unsigned int count, int plus)
3027 {
3028         struct nfs4_exception exception = { };
3029         int err;
3030         do {
3031                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3032                                 _nfs4_proc_readdir(dentry, cred, cookie,
3033                                         pages, count, plus),
3034                                 &exception);
3035         } while (exception.retry);
3036         return err;
3037 }
3038
3039 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3040                 struct iattr *sattr, dev_t rdev)
3041 {
3042         struct nfs4_createdata *data;
3043         int mode = sattr->ia_mode;
3044         int status = -ENOMEM;
3045
3046         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3047         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3048
3049         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3050         if (data == NULL)
3051                 goto out;
3052
3053         if (S_ISFIFO(mode))
3054                 data->arg.ftype = NF4FIFO;
3055         else if (S_ISBLK(mode)) {
3056                 data->arg.ftype = NF4BLK;
3057                 data->arg.u.device.specdata1 = MAJOR(rdev);
3058                 data->arg.u.device.specdata2 = MINOR(rdev);
3059         }
3060         else if (S_ISCHR(mode)) {
3061                 data->arg.ftype = NF4CHR;
3062                 data->arg.u.device.specdata1 = MAJOR(rdev);
3063                 data->arg.u.device.specdata2 = MINOR(rdev);
3064         }
3065
3066         status = nfs4_do_create(dir, dentry, data);
3067
3068         nfs4_free_createdata(data);
3069 out:
3070         return status;
3071 }
3072
3073 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3074                 struct iattr *sattr, dev_t rdev)
3075 {
3076         struct nfs4_exception exception = { };
3077         int err;
3078
3079         sattr->ia_mode &= ~current_umask();
3080         do {
3081                 err = nfs4_handle_exception(NFS_SERVER(dir),
3082                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3083                                 &exception);
3084         } while (exception.retry);
3085         return err;
3086 }
3087
3088 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3089                  struct nfs_fsstat *fsstat)
3090 {
3091         struct nfs4_statfs_arg args = {
3092                 .fh = fhandle,
3093                 .bitmask = server->attr_bitmask,
3094         };
3095         struct nfs4_statfs_res res = {
3096                 .fsstat = fsstat,
3097         };
3098         struct rpc_message msg = {
3099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3100                 .rpc_argp = &args,
3101                 .rpc_resp = &res,
3102         };
3103
3104         nfs_fattr_init(fsstat->fattr);
3105         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3106 }
3107
3108 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3109 {
3110         struct nfs4_exception exception = { };
3111         int err;
3112         do {
3113                 err = nfs4_handle_exception(server,
3114                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3115                                 &exception);
3116         } while (exception.retry);
3117         return err;
3118 }
3119
3120 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3121                 struct nfs_fsinfo *fsinfo)
3122 {
3123         struct nfs4_fsinfo_arg args = {
3124                 .fh = fhandle,
3125                 .bitmask = server->attr_bitmask,
3126         };
3127         struct nfs4_fsinfo_res res = {
3128                 .fsinfo = fsinfo,
3129         };
3130         struct rpc_message msg = {
3131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3132                 .rpc_argp = &args,
3133                 .rpc_resp = &res,
3134         };
3135
3136         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3137 }
3138
3139 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3140 {
3141         struct nfs4_exception exception = { };
3142         int err;
3143
3144         do {
3145                 err = nfs4_handle_exception(server,
3146                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3147                                 &exception);
3148         } while (exception.retry);
3149         return err;
3150 }
3151
3152 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3153 {
3154         nfs_fattr_init(fsinfo->fattr);
3155         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3156 }
3157
3158 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3159                 struct nfs_pathconf *pathconf)
3160 {
3161         struct nfs4_pathconf_arg args = {
3162                 .fh = fhandle,
3163                 .bitmask = server->attr_bitmask,
3164         };
3165         struct nfs4_pathconf_res res = {
3166                 .pathconf = pathconf,
3167         };
3168         struct rpc_message msg = {
3169                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3170                 .rpc_argp = &args,
3171                 .rpc_resp = &res,
3172         };
3173
3174         /* None of the pathconf attributes are mandatory to implement */
3175         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3176                 memset(pathconf, 0, sizeof(*pathconf));
3177                 return 0;
3178         }
3179
3180         nfs_fattr_init(pathconf->fattr);
3181         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3182 }
3183
3184 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3185                 struct nfs_pathconf *pathconf)
3186 {
3187         struct nfs4_exception exception = { };
3188         int err;
3189
3190         do {
3191                 err = nfs4_handle_exception(server,
3192                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3193                                 &exception);
3194         } while (exception.retry);
3195         return err;
3196 }
3197
3198 void __nfs4_read_done_cb(struct nfs_read_data *data)
3199 {
3200         nfs_invalidate_atime(data->inode);
3201 }
3202
3203 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3204 {
3205         struct nfs_server *server = NFS_SERVER(data->inode);
3206
3207         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3208                 rpc_restart_call_prepare(task);
3209                 return -EAGAIN;
3210         }
3211
3212         __nfs4_read_done_cb(data);
3213         if (task->tk_status > 0)
3214                 renew_lease(server, data->timestamp);
3215         return 0;
3216 }
3217
3218 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3219 {
3220
3221         dprintk("--> %s\n", __func__);
3222
3223         if (!nfs4_sequence_done(task, &data->res.seq_res))
3224                 return -EAGAIN;
3225
3226         return data->read_done_cb ? data->read_done_cb(task, data) :
3227                                     nfs4_read_done_cb(task, data);
3228 }
3229
3230 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3231 {
3232         data->timestamp   = jiffies;
3233         data->read_done_cb = nfs4_read_done_cb;
3234         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3235 }
3236
3237 /* Reset the the nfs_read_data to send the read to the MDS. */
3238 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3239 {
3240         dprintk("%s Reset task for i/o through\n", __func__);
3241         put_lseg(data->lseg);
3242         data->lseg = NULL;
3243         /* offsets will differ in the dense stripe case */
3244         data->args.offset = data->mds_offset;
3245         data->ds_clp = NULL;
3246         data->args.fh     = NFS_FH(data->inode);
3247         data->read_done_cb = nfs4_read_done_cb;
3248         task->tk_ops = data->mds_ops;
3249         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3250 }
3251 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3252
3253 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3254 {
3255         struct inode *inode = data->inode;
3256
3257         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3258                 rpc_restart_call_prepare(task);
3259                 return -EAGAIN;
3260         }
3261         if (task->tk_status >= 0) {
3262                 renew_lease(NFS_SERVER(inode), data->timestamp);
3263                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3264         }
3265         return 0;
3266 }
3267
3268 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3269 {
3270         if (!nfs4_sequence_done(task, &data->res.seq_res))
3271                 return -EAGAIN;
3272         return data->write_done_cb ? data->write_done_cb(task, data) :
3273                 nfs4_write_done_cb(task, data);
3274 }
3275
3276 /* Reset the the nfs_write_data to send the write to the MDS. */
3277 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3278 {
3279         dprintk("%s Reset task for i/o through\n", __func__);
3280         put_lseg(data->lseg);
3281         data->lseg          = NULL;
3282         data->ds_clp        = NULL;
3283         data->write_done_cb = nfs4_write_done_cb;
3284         data->args.fh       = NFS_FH(data->inode);
3285         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3286         data->args.offset   = data->mds_offset;
3287         data->res.fattr     = &data->fattr;
3288         task->tk_ops        = data->mds_ops;
3289         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3290 }
3291 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3292
3293 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3294 {
3295         struct nfs_server *server = NFS_SERVER(data->inode);
3296
3297         if (data->lseg) {
3298                 data->args.bitmask = NULL;
3299                 data->res.fattr = NULL;
3300         } else
3301                 data->args.bitmask = server->cache_consistency_bitmask;
3302         if (!data->write_done_cb)
3303                 data->write_done_cb = nfs4_write_done_cb;
3304         data->res.server = server;
3305         data->timestamp   = jiffies;
3306
3307         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3308 }
3309
3310 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3311 {
3312         struct inode *inode = data->inode;
3313
3314         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3315                 rpc_restart_call_prepare(task);
3316                 return -EAGAIN;
3317         }
3318         nfs_refresh_inode(inode, data->res.fattr);
3319         return 0;
3320 }
3321
3322 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3323 {
3324         if (!nfs4_sequence_done(task, &data->res.seq_res))
3325                 return -EAGAIN;
3326         return data->write_done_cb(task, data);
3327 }
3328
3329 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3330 {
3331         struct nfs_server *server = NFS_SERVER(data->inode);
3332
3333         if (data->lseg) {
3334                 data->args.bitmask = NULL;
3335                 data->res.fattr = NULL;
3336         } else
3337                 data->args.bitmask = server->cache_consistency_bitmask;
3338         if (!data->write_done_cb)
3339                 data->write_done_cb = nfs4_commit_done_cb;
3340         data->res.server = server;
3341         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3342 }
3343
3344 struct nfs4_renewdata {
3345         struct nfs_client       *client;
3346         unsigned long           timestamp;
3347 };
3348
3349 /*
3350  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3351  * standalone procedure for queueing an asynchronous RENEW.
3352  */
3353 static void nfs4_renew_release(void *calldata)
3354 {
3355         struct nfs4_renewdata *data = calldata;
3356         struct nfs_client *clp = data->client;
3357
3358         if (atomic_read(&clp->cl_count) > 1)
3359                 nfs4_schedule_state_renewal(clp);
3360         nfs_put_client(clp);
3361         kfree(data);
3362 }
3363
3364 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3365 {
3366         struct nfs4_renewdata *data = calldata;
3367         struct nfs_client *clp = data->client;
3368         unsigned long timestamp = data->timestamp;
3369
3370         if (task->tk_status < 0) {
3371                 /* Unless we're shutting down, schedule state recovery! */
3372                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3373                         return;
3374                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3375                         nfs4_schedule_lease_recovery(clp);
3376                         return;
3377                 }
3378                 nfs4_schedule_path_down_recovery(clp);
3379         }
3380         do_renew_lease(clp, timestamp);
3381 }
3382
3383 static const struct rpc_call_ops nfs4_renew_ops = {
3384         .rpc_call_done = nfs4_renew_done,
3385         .rpc_release = nfs4_renew_release,
3386 };
3387
3388 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3389 {
3390         struct rpc_message msg = {
3391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3392                 .rpc_argp       = clp,
3393                 .rpc_cred       = cred,
3394         };
3395         struct nfs4_renewdata *data;
3396
3397         if (renew_flags == 0)
3398                 return 0;
3399         if (!atomic_inc_not_zero(&clp->cl_count))
3400                 return -EIO;
3401         data = kmalloc(sizeof(*data), GFP_NOFS);
3402         if (data == NULL)
3403                 return -ENOMEM;
3404         data->client = clp;
3405         data->timestamp = jiffies;
3406         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3407                         &nfs4_renew_ops, data);
3408 }
3409
3410 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3411 {
3412         struct rpc_message msg = {
3413                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3414                 .rpc_argp       = clp,
3415                 .rpc_cred       = cred,
3416         };
3417         unsigned long now = jiffies;
3418         int status;
3419
3420         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3421         if (status < 0)
3422                 return status;
3423         do_renew_lease(clp, now);
3424         return 0;
3425 }
3426
3427 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3428 {
3429         return (server->caps & NFS_CAP_ACLS)
3430                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3431                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3432 }
3433
3434 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3435  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3436  * the stack.
3437  */
3438 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3439
3440 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3441                 struct page **pages, unsigned int *pgbase)
3442 {
3443         struct page *newpage, **spages;
3444         int rc = 0;
3445         size_t len;
3446         spages = pages;
3447
3448         do {
3449                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3450                 newpage = alloc_page(GFP_KERNEL);
3451
3452                 if (newpage == NULL)
3453                         goto unwind;
3454                 memcpy(page_address(newpage), buf, len);
3455                 buf += len;
3456                 buflen -= len;
3457                 *pages++ = newpage;
3458                 rc++;
3459         } while (buflen != 0);
3460
3461         return rc;
3462
3463 unwind:
3464         for(; rc > 0; rc--)
3465                 __free_page(spages[rc-1]);
3466         return -ENOMEM;
3467 }
3468
3469 struct nfs4_cached_acl {
3470         int cached;
3471         size_t len;
3472         char data[0];
3473 };
3474
3475 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3476 {
3477         struct nfs_inode *nfsi = NFS_I(inode);
3478
3479         spin_lock(&inode->i_lock);
3480         kfree(nfsi->nfs4_acl);
3481         nfsi->nfs4_acl = acl;
3482         spin_unlock(&inode->i_lock);
3483 }
3484
3485 static void nfs4_zap_acl_attr(struct inode *inode)
3486 {
3487         nfs4_set_cached_acl(inode, NULL);
3488 }
3489
3490 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3491 {
3492         struct nfs_inode *nfsi = NFS_I(inode);
3493         struct nfs4_cached_acl *acl;
3494         int ret = -ENOENT;
3495
3496         spin_lock(&inode->i_lock);
3497         acl = nfsi->nfs4_acl;
3498         if (acl == NULL)
3499                 goto out;
3500         if (buf == NULL) /* user is just asking for length */
3501                 goto out_len;
3502         if (acl->cached == 0)
3503                 goto out;
3504         ret = -ERANGE; /* see getxattr(2) man page */
3505         if (acl->len > buflen)
3506                 goto out;
3507         memcpy(buf, acl->data, acl->len);
3508 out_len:
3509         ret = acl->len;
3510 out:
3511         spin_unlock(&inode->i_lock);
3512         return ret;
3513 }
3514
3515 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3516 {
3517         struct nfs4_cached_acl *acl;
3518
3519         if (buf && acl_len <= PAGE_SIZE) {
3520                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3521                 if (acl == NULL)
3522                         goto out;
3523                 acl->cached = 1;
3524                 memcpy(acl->data, buf, acl_len);
3525         } else {
3526                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3527                 if (acl == NULL)
3528                         goto out;
3529                 acl->cached = 0;
3530         }
3531         acl->len = acl_len;
3532 out:
3533         nfs4_set_cached_acl(inode, acl);
3534 }
3535
3536 /*
3537  * The getxattr API returns the required buffer length when called with a
3538  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3539  * the required buf.  On a NULL buf, we send a page of data to the server
3540  * guessing that the ACL request can be serviced by a page. If so, we cache
3541  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3542  * the cache. If not so, we throw away the page, and cache the required
3543  * length. The next getxattr call will then produce another round trip to
3544  * the server, this time with the input buf of the required size.
3545  */
3546 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3547 {
3548         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3549         struct nfs_getaclargs args = {
3550                 .fh = NFS_FH(inode),
3551                 .acl_pages = pages,
3552                 .acl_len = buflen,
3553         };
3554         struct nfs_getaclres res = {
3555                 .acl_len = buflen,
3556         };
3557         void *resp_buf;
3558         struct rpc_message msg = {
3559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3560                 .rpc_argp = &args,
3561                 .rpc_resp = &res,
3562         };
3563         int ret = -ENOMEM, npages, i, acl_len = 0;
3564
3565         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3566         /* As long as we're doing a round trip to the server anyway,
3567          * let's be prepared for a page of acl data. */
3568         if (npages == 0)
3569                 npages = 1;
3570
3571         for (i = 0; i < npages; i++) {
3572                 pages[i] = alloc_page(GFP_KERNEL);
3573                 if (!pages[i])
3574                         goto out_free;
3575         }
3576         if (npages > 1) {
3577                 /* for decoding across pages */
3578                 res.acl_scratch = alloc_page(GFP_KERNEL);
3579                 if (!res.acl_scratch)
3580                         goto out_free;
3581         }
3582         args.acl_len = npages * PAGE_SIZE;
3583         args.acl_pgbase = 0;
3584         /* Let decode_getfacl know not to fail if the ACL data is larger than
3585          * the page we send as a guess */
3586         if (buf == NULL)
3587                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3588         resp_buf = page_address(pages[0]);
3589
3590         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3591                 __func__, buf, buflen, npages, args.acl_len);
3592         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3593                              &msg, &args.seq_args, &res.seq_res, 0);
3594         if (ret)
3595                 goto out_free;
3596
3597         acl_len = res.acl_len - res.acl_data_offset;
3598         if (acl_len > args.acl_len)
3599                 nfs4_write_cached_acl(inode, NULL, acl_len);
3600         else
3601                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3602                                       acl_len);
3603         if (buf) {
3604                 ret = -ERANGE;
3605                 if (acl_len > buflen)
3606                         goto out_free;
3607                 _copy_from_pages(buf, pages, res.acl_data_offset,
3608                                 res.acl_len);
3609         }
3610         ret = acl_len;
3611 out_free:
3612         for (i = 0; i < npages; i++)
3613                 if (pages[i])
3614                         __free_page(pages[i]);
3615         if (res.acl_scratch)
3616                 __free_page(res.acl_scratch);
3617         return ret;
3618 }
3619
3620 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3621 {
3622         struct nfs4_exception exception = { };
3623         ssize_t ret;
3624         do {
3625                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3626                 if (ret >= 0)
3627                         break;
3628                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3629         } while (exception.retry);
3630         return ret;
3631 }
3632
3633 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3634 {
3635         struct nfs_server *server = NFS_SERVER(inode);
3636         int ret;
3637
3638         if (!nfs4_server_supports_acls(server))
3639                 return -EOPNOTSUPP;
3640         ret = nfs_revalidate_inode(server, inode);
3641         if (ret < 0)
3642                 return ret;
3643         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3644                 nfs_zap_acl_cache(inode);
3645         ret = nfs4_read_cached_acl(inode, buf, buflen);
3646         if (ret != -ENOENT)
3647                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3648                  * but no cached acl data, just the acl length */
3649                 return ret;
3650         return nfs4_get_acl_uncached(inode, buf, buflen);
3651 }
3652
3653 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3654 {
3655         struct nfs_server *server = NFS_SERVER(inode);
3656         struct page *pages[NFS4ACL_MAXPAGES];
3657         struct nfs_setaclargs arg = {
3658                 .fh             = NFS_FH(inode),
3659                 .acl_pages      = pages,
3660                 .acl_len        = buflen,
3661         };
3662         struct nfs_setaclres res;
3663         struct rpc_message msg = {
3664                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3665                 .rpc_argp       = &arg,
3666                 .rpc_resp       = &res,
3667         };
3668         int ret, i;
3669
3670         if (!nfs4_server_supports_acls(server))
3671                 return -EOPNOTSUPP;
3672         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3673         if (i < 0)
3674                 return i;
3675         nfs_inode_return_delegation(inode);
3676         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3677
3678         /*
3679          * Free each page after tx, so the only ref left is
3680          * held by the network stack
3681          */
3682         for (; i > 0; i--)
3683                 put_page(pages[i-1]);
3684
3685         /*
3686          * Acl update can result in inode attribute update.
3687          * so mark the attribute cache invalid.
3688          */
3689         spin_lock(&inode->i_lock);
3690         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3691         spin_unlock(&inode->i_lock);
3692         nfs_access_zap_cache(inode);
3693         nfs_zap_acl_cache(inode);
3694         return ret;
3695 }
3696
3697 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3698 {
3699         struct nfs4_exception exception = { };
3700         int err;
3701         do {
3702                 err = nfs4_handle_exception(NFS_SERVER(inode),
3703                                 __nfs4_proc_set_acl(inode, buf, buflen),
3704                                 &exception);
3705         } while (exception.retry);
3706         return err;
3707 }
3708
3709 static int
3710 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3711 {
3712         struct nfs_client *clp = server->nfs_client;
3713
3714         if (task->tk_status >= 0)
3715                 return 0;
3716         switch(task->tk_status) {
3717                 case -NFS4ERR_ADMIN_REVOKED:
3718                 case -NFS4ERR_BAD_STATEID:
3719                 case -NFS4ERR_OPENMODE:
3720                         if (state == NULL)
3721                                 break;
3722                         nfs4_schedule_stateid_recovery(server, state);
3723                         goto wait_on_recovery;
3724                 case -NFS4ERR_EXPIRED:
3725                         if (state != NULL)
3726                                 nfs4_schedule_stateid_recovery(server, state);
3727                 case -NFS4ERR_STALE_STATEID:
3728                 case -NFS4ERR_STALE_CLIENTID:
3729                         nfs4_schedule_lease_recovery(clp);
3730                         goto wait_on_recovery;
3731 #if defined(CONFIG_NFS_V4_1)
3732                 case -NFS4ERR_BADSESSION:
3733                 case -NFS4ERR_BADSLOT:
3734                 case -NFS4ERR_BAD_HIGH_SLOT:
3735                 case -NFS4ERR_DEADSESSION:
3736                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3737                 case -NFS4ERR_SEQ_FALSE_RETRY:
3738                 case -NFS4ERR_SEQ_MISORDERED:
3739                         dprintk("%s ERROR %d, Reset session\n", __func__,
3740                                 task->tk_status);
3741                         nfs4_schedule_session_recovery(clp->cl_session);
3742                         task->tk_status = 0;
3743                         return -EAGAIN;
3744 #endif /* CONFIG_NFS_V4_1 */
3745                 case -NFS4ERR_DELAY:
3746                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3747                 case -NFS4ERR_GRACE:
3748                 case -EKEYEXPIRED:
3749                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3750                         task->tk_status = 0;
3751                         return -EAGAIN;
3752                 case -NFS4ERR_RETRY_UNCACHED_REP:
3753                 case -NFS4ERR_OLD_STATEID:
3754                         task->tk_status = 0;
3755                         return -EAGAIN;
3756         }
3757         task->tk_status = nfs4_map_errors(task->tk_status);
3758         return 0;
3759 wait_on_recovery:
3760         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3761         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3762                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3763         task->tk_status = 0;
3764         return -EAGAIN;
3765 }
3766
3767 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3768                 unsigned short port, struct rpc_cred *cred,
3769                 struct nfs4_setclientid_res *res)
3770 {
3771         nfs4_verifier sc_verifier;
3772         struct nfs4_setclientid setclientid = {
3773                 .sc_verifier = &sc_verifier,
3774                 .sc_prog = program,
3775                 .sc_cb_ident = clp->cl_cb_ident,
3776         };
3777         struct rpc_message msg = {
3778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3779                 .rpc_argp = &setclientid,
3780                 .rpc_resp = res,
3781                 .rpc_cred = cred,
3782         };
3783         __be32 *p;
3784         int loop = 0;
3785         int status;
3786
3787         p = (__be32*)sc_verifier.data;
3788         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3789         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3790
3791         for(;;) {
3792                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3793                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3794                                 clp->cl_ipaddr,
3795                                 rpc_peeraddr2str(clp->cl_rpcclient,
3796                                                         RPC_DISPLAY_ADDR),
3797                                 rpc_peeraddr2str(clp->cl_rpcclient,
3798                                                         RPC_DISPLAY_PROTO),
3799                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3800                                 clp->cl_id_uniquifier);
3801                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3802                                 sizeof(setclientid.sc_netid),
3803                                 rpc_peeraddr2str(clp->cl_rpcclient,
3804                                                         RPC_DISPLAY_NETID));
3805                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3806                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3807                                 clp->cl_ipaddr, port >> 8, port & 255);
3808
3809                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3810                 if (status != -NFS4ERR_CLID_INUSE)
3811                         break;
3812                 if (loop != 0) {
3813                         ++clp->cl_id_uniquifier;
3814                         break;
3815                 }
3816                 ++loop;
3817                 ssleep(clp->cl_lease_time / HZ + 1);
3818         }
3819         return status;
3820 }
3821
3822 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3823                 struct nfs4_setclientid_res *arg,
3824                 struct rpc_cred *cred)
3825 {
3826         struct nfs_fsinfo fsinfo;
3827         struct rpc_message msg = {
3828                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3829                 .rpc_argp = arg,
3830                 .rpc_resp = &fsinfo,
3831                 .rpc_cred = cred,
3832         };
3833         unsigned long now;
3834         int status;
3835
3836         now = jiffies;
3837         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3838         if (status == 0) {
3839                 spin_lock(&clp->cl_lock);
3840                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3841                 clp->cl_last_renewal = now;
3842                 spin_unlock(&clp->cl_lock);
3843         }
3844         return status;
3845 }
3846
3847 struct nfs4_delegreturndata {
3848         struct nfs4_delegreturnargs args;
3849         struct nfs4_delegreturnres res;
3850         struct nfs_fh fh;
3851         nfs4_stateid stateid;
3852         unsigned long timestamp;
3853         struct nfs_fattr fattr;
3854         int rpc_status;
3855 };
3856
3857 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3858 {
3859         struct nfs4_delegreturndata *data = calldata;
3860
3861         if (!nfs4_sequence_done(task, &data->res.seq_res))
3862                 return;
3863
3864         switch (task->tk_status) {
3865         case -NFS4ERR_STALE_STATEID:
3866         case -NFS4ERR_EXPIRED:
3867         case 0:
3868                 renew_lease(data->res.server, data->timestamp);
3869                 break;
3870         default:
3871                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3872                                 -EAGAIN) {
3873                         rpc_restart_call_prepare(task);
3874                         return;
3875                 }
3876         }
3877         data->rpc_status = task->tk_status;
3878 }
3879
3880 static void nfs4_delegreturn_release(void *calldata)
3881 {
3882         kfree(calldata);
3883 }
3884
3885 #if defined(CONFIG_NFS_V4_1)
3886 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3887 {
3888         struct nfs4_delegreturndata *d_data;
3889
3890         d_data = (struct nfs4_delegreturndata *)data;
3891
3892         if (nfs4_setup_sequence(d_data->res.server,
3893                                 &d_data->args.seq_args,
3894                                 &d_data->res.seq_res, 1, task))
3895                 return;
3896         rpc_call_start(task);
3897 }
3898 #endif /* CONFIG_NFS_V4_1 */
3899
3900 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3901 #if defined(CONFIG_NFS_V4_1)
3902         .rpc_call_prepare = nfs4_delegreturn_prepare,
3903 #endif /* CONFIG_NFS_V4_1 */
3904         .rpc_call_done = nfs4_delegreturn_done,
3905         .rpc_release = nfs4_delegreturn_release,
3906 };
3907
3908 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3909 {
3910         struct nfs4_delegreturndata *data;
3911         struct nfs_server *server = NFS_SERVER(inode);
3912         struct rpc_task *task;
3913         struct rpc_message msg = {
3914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3915                 .rpc_cred = cred,
3916         };
3917         struct rpc_task_setup task_setup_data = {
3918                 .rpc_client = server->client,
3919                 .rpc_message = &msg,
3920                 .callback_ops = &nfs4_delegreturn_ops,
3921                 .flags = RPC_TASK_ASYNC,
3922         };
3923         int status = 0;
3924
3925         data = kzalloc(sizeof(*data), GFP_NOFS);
3926         if (data == NULL)
3927                 return -ENOMEM;
3928         data->args.fhandle = &data->fh;
3929         data->args.stateid = &data->stateid;
3930         data->args.bitmask = server->attr_bitmask;
3931         nfs_copy_fh(&data->fh, NFS_FH(inode));
3932         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3933         data->res.fattr = &data->fattr;
3934         data->res.server = server;
3935         nfs_fattr_init(data->res.fattr);
3936         data->timestamp = jiffies;
3937         data->rpc_status = 0;
3938
3939         task_setup_data.callback_data = data;
3940         msg.rpc_argp = &data->args;
3941         msg.rpc_resp = &data->res;
3942         task = rpc_run_task(&task_setup_data);
3943         if (IS_ERR(task))
3944                 return PTR_ERR(task);
3945         if (!issync)
3946                 goto out;
3947         status = nfs4_wait_for_completion_rpc_task(task);
3948         if (status != 0)
3949                 goto out;
3950         status = data->rpc_status;
3951         if (status != 0)
3952                 goto out;
3953         nfs_refresh_inode(inode, &data->fattr);
3954 out:
3955         rpc_put_task(task);
3956         return status;
3957 }
3958
3959 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3960 {
3961         struct nfs_server *server = NFS_SERVER(inode);
3962         struct nfs4_exception exception = { };
3963         int err;
3964         do {
3965                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3966                 switch (err) {
3967                         case -NFS4ERR_STALE_STATEID:
3968                         case -NFS4ERR_EXPIRED:
3969                         case 0:
3970                                 return 0;
3971                 }
3972                 err = nfs4_handle_exception(server, err, &exception);
3973         } while (exception.retry);
3974         return err;
3975 }
3976
3977 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3978 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3979
3980 /*
3981  * sleep, with exponential backoff, and retry the LOCK operation.
3982  */
3983 static unsigned long
3984 nfs4_set_lock_task_retry(unsigned long timeout)
3985 {
3986         freezable_schedule_timeout_killable(timeout);
3987         timeout <<= 1;
3988         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3989                 return NFS4_LOCK_MAXTIMEOUT;
3990         return timeout;
3991 }
3992
3993 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3994 {
3995         struct inode *inode = state->inode;
3996         struct nfs_server *server = NFS_SERVER(inode);
3997         struct nfs_client *clp = server->nfs_client;
3998         struct nfs_lockt_args arg = {
3999                 .fh = NFS_FH(inode),
4000                 .fl = request,
4001         };
4002         struct nfs_lockt_res res = {
4003                 .denied = request,
4004         };
4005         struct rpc_message msg = {
4006                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4007                 .rpc_argp       = &arg,
4008                 .rpc_resp       = &res,
4009                 .rpc_cred       = state->owner->so_cred,
4010         };
4011         struct nfs4_lock_state *lsp;
4012         int status;
4013
4014         arg.lock_owner.clientid = clp->cl_clientid;
4015         status = nfs4_set_lock_state(state, request);
4016         if (status != 0)
4017                 goto out;
4018         lsp = request->fl_u.nfs4_fl.owner;
4019         arg.lock_owner.id = lsp->ls_id.id;
4020         arg.lock_owner.s_dev = server->s_dev;
4021         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4022         switch (status) {
4023                 case 0:
4024                         request->fl_type = F_UNLCK;
4025                         break;
4026                 case -NFS4ERR_DENIED:
4027                         status = 0;
4028         }
4029         request->fl_ops->fl_release_private(request);
4030 out:
4031         return status;
4032 }
4033
4034 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4035 {
4036         struct nfs4_exception exception = { };
4037         int err;
4038
4039         do {
4040                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4041                                 _nfs4_proc_getlk(state, cmd, request),
4042                                 &exception);
4043         } while (exception.retry);
4044         return err;
4045 }
4046
4047 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4048 {
4049         int res = 0;
4050         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4051                 case FL_POSIX:
4052                         res = posix_lock_file_wait(file, fl);
4053                         break;
4054                 case FL_FLOCK:
4055                         res = flock_lock_file_wait(file, fl);
4056                         break;
4057                 default:
4058                         BUG();
4059         }
4060         return res;
4061 }
4062
4063 struct nfs4_unlockdata {
4064         struct nfs_locku_args arg;
4065         struct nfs_locku_res res;
4066         struct nfs4_lock_state *lsp;
4067         struct nfs_open_context *ctx;
4068         struct file_lock fl;
4069         const struct nfs_server *server;
4070         unsigned long timestamp;
4071 };
4072
4073 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4074                 struct nfs_open_context *ctx,
4075                 struct nfs4_lock_state *lsp,
4076                 struct nfs_seqid *seqid)
4077 {
4078         struct nfs4_unlockdata *p;
4079         struct inode *inode = lsp->ls_state->inode;
4080
4081         p = kzalloc(sizeof(*p), GFP_NOFS);
4082         if (p == NULL)
4083                 return NULL;
4084         p->arg.fh = NFS_FH(inode);
4085         p->arg.fl = &p->fl;
4086         p->arg.seqid = seqid;
4087         p->res.seqid = seqid;
4088         p->arg.stateid = &lsp->ls_stateid;
4089         p->lsp = lsp;
4090         atomic_inc(&lsp->ls_count);
4091         /* Ensure we don't close file until we're done freeing locks! */
4092         p->ctx = get_nfs_open_context(ctx);
4093         memcpy(&p->fl, fl, sizeof(p->fl));
4094         p->server = NFS_SERVER(inode);
4095         return p;
4096 }
4097
4098 static void nfs4_locku_release_calldata(void *data)
4099 {
4100         struct nfs4_unlockdata *calldata = data;
4101         nfs_free_seqid(calldata->arg.seqid);
4102         nfs4_put_lock_state(calldata->lsp);
4103         put_nfs_open_context(calldata->ctx);
4104         kfree(calldata);
4105 }
4106
4107 static void nfs4_locku_done(struct rpc_task *task, void *data)
4108 {
4109         struct nfs4_unlockdata *calldata = data;
4110
4111         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4112                 return;
4113         switch (task->tk_status) {
4114                 case 0:
4115                         memcpy(calldata->lsp->ls_stateid.data,
4116                                         calldata->res.stateid.data,
4117                                         sizeof(calldata->lsp->ls_stateid.data));
4118                         renew_lease(calldata->server, calldata->timestamp);
4119                         break;
4120                 case -NFS4ERR_BAD_STATEID:
4121                 case -NFS4ERR_OLD_STATEID:
4122                 case -NFS4ERR_STALE_STATEID:
4123                 case -NFS4ERR_EXPIRED:
4124                         break;
4125                 default:
4126                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4127                                 rpc_restart_call_prepare(task);
4128         }
4129 }
4130
4131 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4132 {
4133         struct nfs4_unlockdata *calldata = data;
4134
4135         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4136                 return;
4137         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4138                 /* Note: exit _without_ running nfs4_locku_done */
4139                 task->tk_action = NULL;
4140                 return;
4141         }
4142         calldata->timestamp = jiffies;
4143         if (nfs4_setup_sequence(calldata->server,
4144                                 &calldata->arg.seq_args,
4145                                 &calldata->res.seq_res, 1, task))
4146                 return;
4147         rpc_call_start(task);
4148 }
4149
4150 static const struct rpc_call_ops nfs4_locku_ops = {
4151         .rpc_call_prepare = nfs4_locku_prepare,
4152         .rpc_call_done = nfs4_locku_done,
4153         .rpc_release = nfs4_locku_release_calldata,
4154 };
4155
4156 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4157                 struct nfs_open_context *ctx,
4158                 struct nfs4_lock_state *lsp,
4159                 struct nfs_seqid *seqid)
4160 {
4161         struct nfs4_unlockdata *data;
4162         struct rpc_message msg = {
4163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4164                 .rpc_cred = ctx->cred,
4165         };
4166         struct rpc_task_setup task_setup_data = {
4167                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4168                 .rpc_message = &msg,
4169                 .callback_ops = &nfs4_locku_ops,
4170                 .workqueue = nfsiod_workqueue,
4171                 .flags = RPC_TASK_ASYNC,
4172         };
4173
4174         /* Ensure this is an unlock - when canceling a lock, the
4175          * canceled lock is passed in, and it won't be an unlock.
4176          */
4177         fl->fl_type = F_UNLCK;
4178
4179         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4180         if (data == NULL) {
4181                 nfs_free_seqid(seqid);
4182                 return ERR_PTR(-ENOMEM);
4183         }
4184
4185         msg.rpc_argp = &data->arg;
4186         msg.rpc_resp = &data->res;
4187         task_setup_data.callback_data = data;
4188         return rpc_run_task(&task_setup_data);
4189 }
4190
4191 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4192 {
4193         struct nfs_inode *nfsi = NFS_I(state->inode);
4194         struct nfs_seqid *seqid;
4195         struct nfs4_lock_state *lsp;
4196         struct rpc_task *task;
4197         int status = 0;
4198         unsigned char fl_flags = request->fl_flags;
4199
4200         status = nfs4_set_lock_state(state, request);
4201         /* Unlock _before_ we do the RPC call */
4202         request->fl_flags |= FL_EXISTS;
4203         down_read(&nfsi->rwsem);
4204         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4205                 up_read(&nfsi->rwsem);
4206                 goto out;
4207         }
4208         up_read(&nfsi->rwsem);
4209         if (status != 0)
4210                 goto out;
4211         /* Is this a delegated lock? */
4212         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4213                 goto out;
4214         lsp = request->fl_u.nfs4_fl.owner;
4215         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4216         status = -ENOMEM;
4217         if (seqid == NULL)
4218                 goto out;
4219         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4220         status = PTR_ERR(task);
4221         if (IS_ERR(task))
4222                 goto out;
4223         status = nfs4_wait_for_completion_rpc_task(task);
4224         rpc_put_task(task);
4225 out:
4226         request->fl_flags = fl_flags;
4227         return status;
4228 }
4229
4230 struct nfs4_lockdata {
4231         struct nfs_lock_args arg;
4232         struct nfs_lock_res res;
4233         struct nfs4_lock_state *lsp;
4234         struct nfs_open_context *ctx;
4235         struct file_lock fl;
4236         unsigned long timestamp;
4237         int rpc_status;
4238         int cancelled;
4239         struct nfs_server *server;
4240 };
4241
4242 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4243                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4244                 gfp_t gfp_mask)
4245 {
4246         struct nfs4_lockdata *p;
4247         struct inode *inode = lsp->ls_state->inode;
4248         struct nfs_server *server = NFS_SERVER(inode);
4249
4250         p = kzalloc(sizeof(*p), gfp_mask);
4251         if (p == NULL)
4252                 return NULL;
4253
4254         p->arg.fh = NFS_FH(inode);
4255         p->arg.fl = &p->fl;
4256         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4257         if (p->arg.open_seqid == NULL)
4258                 goto out_free;
4259         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4260         if (p->arg.lock_seqid == NULL)
4261                 goto out_free_seqid;
4262         p->arg.lock_stateid = &lsp->ls_stateid;
4263         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4264         p->arg.lock_owner.id = lsp->ls_id.id;
4265         p->arg.lock_owner.s_dev = server->s_dev;
4266         p->res.lock_seqid = p->arg.lock_seqid;
4267         p->lsp = lsp;
4268         p->server = server;
4269         atomic_inc(&lsp->ls_count);
4270         p->ctx = get_nfs_open_context(ctx);
4271         memcpy(&p->fl, fl, sizeof(p->fl));
4272         return p;
4273 out_free_seqid:
4274         nfs_free_seqid(p->arg.open_seqid);
4275 out_free:
4276         kfree(p);
4277         return NULL;
4278 }
4279
4280 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4281 {
4282         struct nfs4_lockdata *data = calldata;
4283         struct nfs4_state *state = data->lsp->ls_state;
4284
4285         dprintk("%s: begin!\n", __func__);
4286         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4287                 return;
4288         /* Do we need to do an open_to_lock_owner? */
4289         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4290                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4291                         return;
4292                 data->arg.open_stateid = &state->stateid;
4293                 data->arg.new_lock_owner = 1;
4294                 data->res.open_seqid = data->arg.open_seqid;
4295         } else
4296                 data->arg.new_lock_owner = 0;
4297         data->timestamp = jiffies;
4298         if (nfs4_setup_sequence(data->server,
4299                                 &data->arg.seq_args,
4300                                 &data->res.seq_res, 1, task))
4301                 return;
4302         rpc_call_start(task);
4303         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4304 }
4305
4306 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4307 {
4308         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4309         nfs4_lock_prepare(task, calldata);
4310 }
4311
4312 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4313 {
4314         struct nfs4_lockdata *data = calldata;
4315
4316         dprintk("%s: begin!\n", __func__);
4317
4318         if (!nfs4_sequence_done(task, &data->res.seq_res))
4319                 return;
4320
4321         data->rpc_status = task->tk_status;
4322         if (data->arg.new_lock_owner != 0) {
4323                 if (data->rpc_status == 0)
4324                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4325                 else
4326                         goto out;
4327         }
4328         if (data->rpc_status == 0) {
4329                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4330                                         sizeof(data->lsp->ls_stateid.data));
4331                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4332                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4333         }
4334 out:
4335         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4336 }
4337
4338 static void nfs4_lock_release(void *calldata)
4339 {
4340         struct nfs4_lockdata *data = calldata;
4341
4342         dprintk("%s: begin!\n", __func__);
4343         nfs_free_seqid(data->arg.open_seqid);
4344         if (data->cancelled != 0) {
4345                 struct rpc_task *task;
4346                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4347                                 data->arg.lock_seqid);
4348                 if (!IS_ERR(task))
4349                         rpc_put_task_async(task);
4350                 dprintk("%s: cancelling lock!\n", __func__);
4351         } else
4352                 nfs_free_seqid(data->arg.lock_seqid);
4353         nfs4_put_lock_state(data->lsp);
4354         put_nfs_open_context(data->ctx);
4355         kfree(data);
4356         dprintk("%s: done!\n", __func__);
4357 }
4358
4359 static const struct rpc_call_ops nfs4_lock_ops = {
4360         .rpc_call_prepare = nfs4_lock_prepare,
4361         .rpc_call_done = nfs4_lock_done,
4362         .rpc_release = nfs4_lock_release,
4363 };
4364
4365 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4366         .rpc_call_prepare = nfs4_recover_lock_prepare,
4367         .rpc_call_done = nfs4_lock_done,
4368         .rpc_release = nfs4_lock_release,
4369 };
4370
4371 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4372 {
4373         switch (error) {
4374         case -NFS4ERR_ADMIN_REVOKED:
4375         case -NFS4ERR_BAD_STATEID:
4376                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4377                 if (new_lock_owner != 0 ||
4378                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4379                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4380                 break;
4381         case -NFS4ERR_STALE_STATEID:
4382                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4383         case -NFS4ERR_EXPIRED:
4384                 nfs4_schedule_lease_recovery(server->nfs_client);
4385         };
4386 }
4387
4388 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4389 {
4390         struct nfs4_lockdata *data;
4391         struct rpc_task *task;
4392         struct rpc_message msg = {
4393                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4394                 .rpc_cred = state->owner->so_cred,
4395         };
4396         struct rpc_task_setup task_setup_data = {
4397                 .rpc_client = NFS_CLIENT(state->inode),
4398                 .rpc_message = &msg,
4399                 .callback_ops = &nfs4_lock_ops,
4400                 .workqueue = nfsiod_workqueue,
4401                 .flags = RPC_TASK_ASYNC,
4402         };
4403         int ret;
4404
4405         dprintk("%s: begin!\n", __func__);
4406         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4407                         fl->fl_u.nfs4_fl.owner,
4408                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4409         if (data == NULL)
4410                 return -ENOMEM;
4411         if (IS_SETLKW(cmd))
4412                 data->arg.block = 1;
4413         if (recovery_type > NFS_LOCK_NEW) {
4414                 if (recovery_type == NFS_LOCK_RECLAIM)
4415                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4416                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4417         }
4418         msg.rpc_argp = &data->arg;
4419         msg.rpc_resp = &data->res;
4420         task_setup_data.callback_data = data;
4421         task = rpc_run_task(&task_setup_data);
4422         if (IS_ERR(task))
4423                 return PTR_ERR(task);
4424         ret = nfs4_wait_for_completion_rpc_task(task);
4425         if (ret == 0) {
4426                 ret = data->rpc_status;
4427                 if (ret)
4428                         nfs4_handle_setlk_error(data->server, data->lsp,
4429                                         data->arg.new_lock_owner, ret);
4430         } else
4431                 data->cancelled = 1;
4432         rpc_put_task(task);
4433         dprintk("%s: done, ret = %d!\n", __func__, ret);
4434         return ret;
4435 }
4436
4437 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4438 {
4439         struct nfs_server *server = NFS_SERVER(state->inode);
4440         struct nfs4_exception exception = { };
4441         int err;
4442
4443         do {
4444                 /* Cache the lock if possible... */
4445                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4446                         return 0;
4447                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4448                 if (err != -NFS4ERR_DELAY)
4449                         break;
4450                 nfs4_handle_exception(server, err, &exception);
4451         } while (exception.retry);
4452         return err;
4453 }
4454
4455 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4456 {
4457         struct nfs_server *server = NFS_SERVER(state->inode);
4458         struct nfs4_exception exception = { };
4459         int err;
4460
4461         err = nfs4_set_lock_state(state, request);
4462         if (err != 0)
4463                 return err;
4464         do {
4465                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4466                         return 0;
4467                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4468                 switch (err) {
4469                 default:
4470                         goto out;
4471                 case -NFS4ERR_GRACE:
4472                 case -NFS4ERR_DELAY:
4473                         nfs4_handle_exception(server, err, &exception);
4474                         err = 0;
4475                 }
4476         } while (exception.retry);
4477 out:
4478         return err;
4479 }
4480
4481 #if defined(CONFIG_NFS_V4_1)
4482 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4483 {
4484         int status;
4485         struct nfs_server *server = NFS_SERVER(state->inode);
4486
4487         status = nfs41_test_stateid(server, state);
4488         if (status == NFS_OK)
4489                 return 0;
4490         nfs41_free_stateid(server, state);
4491         return nfs4_lock_expired(state, request);
4492 }
4493 #endif
4494
4495 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4496 {
4497         struct nfs_inode *nfsi = NFS_I(state->inode);
4498         unsigned char fl_flags = request->fl_flags;
4499         int status = -ENOLCK;
4500
4501         if ((fl_flags & FL_POSIX) &&
4502                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4503                 goto out;
4504         /* Is this a delegated open? */
4505         status = nfs4_set_lock_state(state, request);
4506         if (status != 0)
4507                 goto out;
4508         request->fl_flags |= FL_ACCESS;
4509         status = do_vfs_lock(request->fl_file, request);
4510         if (status < 0)
4511                 goto out;
4512         down_read(&nfsi->rwsem);
4513         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4514                 /* Yes: cache locks! */
4515                 /* ...but avoid races with delegation recall... */
4516                 request->fl_flags = fl_flags & ~FL_SLEEP;
4517                 status = do_vfs_lock(request->fl_file, request);
4518                 goto out_unlock;
4519         }
4520         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4521         if (status != 0)
4522                 goto out_unlock;
4523         /* Note: we always want to sleep here! */
4524         request->fl_flags = fl_flags | FL_SLEEP;
4525         if (do_vfs_lock(request->fl_file, request) < 0)
4526                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4527 out_unlock:
4528         up_read(&nfsi->rwsem);
4529 out:
4530         request->fl_flags = fl_flags;
4531         return status;
4532 }
4533
4534 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4535 {
4536         struct nfs4_exception exception = { };
4537         int err;
4538
4539         do {
4540                 err = _nfs4_proc_setlk(state, cmd, request);
4541                 if (err == -NFS4ERR_DENIED)
4542                         err = -EAGAIN;
4543                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4544                                 err, &exception);
4545         } while (exception.retry);
4546         return err;
4547 }
4548
4549 static int
4550 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4551 {
4552         struct nfs_open_context *ctx;
4553         struct nfs4_state *state;
4554         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4555         int status;
4556
4557         /* verify open state */
4558         ctx = nfs_file_open_context(filp);
4559         state = ctx->state;
4560
4561         if (request->fl_start < 0 || request->fl_end < 0)
4562                 return -EINVAL;
4563
4564         if (IS_GETLK(cmd)) {
4565                 if (state != NULL)
4566                         return nfs4_proc_getlk(state, F_GETLK, request);
4567                 return 0;
4568         }
4569
4570         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4571                 return -EINVAL;
4572
4573         if (request->fl_type == F_UNLCK) {
4574                 if (state != NULL)
4575                         return nfs4_proc_unlck(state, cmd, request);
4576                 return 0;
4577         }
4578
4579         if (state == NULL)
4580                 return -ENOLCK;
4581         do {
4582                 status = nfs4_proc_setlk(state, cmd, request);
4583                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4584                         break;
4585                 timeout = nfs4_set_lock_task_retry(timeout);
4586                 status = -ERESTARTSYS;
4587                 if (signalled())
4588                         break;
4589         } while(status < 0);
4590         return status;
4591 }
4592
4593 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4594 {
4595         struct nfs_server *server = NFS_SERVER(state->inode);
4596         struct nfs4_exception exception = { };
4597         int err;
4598
4599         err = nfs4_set_lock_state(state, fl);
4600         if (err != 0)
4601                 goto out;
4602         do {
4603                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4604                 switch (err) {
4605                         default:
4606                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4607                                                 __func__, err);
4608                         case 0:
4609                         case -ESTALE:
4610                                 goto out;
4611                         case -NFS4ERR_EXPIRED:
4612                                 nfs4_schedule_stateid_recovery(server, state);
4613                         case -NFS4ERR_STALE_CLIENTID:
4614                         case -NFS4ERR_STALE_STATEID:
4615                                 nfs4_schedule_lease_recovery(server->nfs_client);
4616                                 goto out;
4617                         case -NFS4ERR_BADSESSION:
4618                         case -NFS4ERR_BADSLOT:
4619                         case -NFS4ERR_BAD_HIGH_SLOT:
4620                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4621                         case -NFS4ERR_DEADSESSION:
4622                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4623                                 goto out;
4624                         case -ERESTARTSYS:
4625                                 /*
4626                                  * The show must go on: exit, but mark the
4627                                  * stateid as needing recovery.
4628                                  */
4629                         case -NFS4ERR_ADMIN_REVOKED:
4630                         case -NFS4ERR_BAD_STATEID:
4631                         case -NFS4ERR_OPENMODE:
4632                                 nfs4_schedule_stateid_recovery(server, state);
4633                                 err = 0;
4634                                 goto out;
4635                         case -EKEYEXPIRED:
4636                                 /*
4637                                  * User RPCSEC_GSS context has expired.
4638                                  * We cannot recover this stateid now, so
4639                                  * skip it and allow recovery thread to
4640                                  * proceed.
4641                                  */
4642                                 err = 0;
4643                                 goto out;
4644                         case -ENOMEM:
4645                         case -NFS4ERR_DENIED:
4646                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4647                                 err = 0;
4648                                 goto out;
4649                         case -NFS4ERR_DELAY:
4650                                 break;
4651                 }
4652                 err = nfs4_handle_exception(server, err, &exception);
4653         } while (exception.retry);
4654 out:
4655         return err;
4656 }
4657
4658 static void nfs4_release_lockowner_release(void *calldata)
4659 {
4660         kfree(calldata);
4661 }
4662
4663 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4664         .rpc_release = nfs4_release_lockowner_release,
4665 };
4666
4667 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4668 {
4669         struct nfs_server *server = lsp->ls_state->owner->so_server;
4670         struct nfs_release_lockowner_args *args;
4671         struct rpc_message msg = {
4672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4673         };
4674
4675         if (server->nfs_client->cl_mvops->minor_version != 0)
4676                 return;
4677         args = kmalloc(sizeof(*args), GFP_NOFS);
4678         if (!args)
4679                 return;
4680         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4681         args->lock_owner.id = lsp->ls_id.id;
4682         args->lock_owner.s_dev = server->s_dev;
4683         msg.rpc_argp = args;
4684         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4685 }
4686
4687 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4688
4689 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4690                                    const void *buf, size_t buflen,
4691                                    int flags, int type)
4692 {
4693         if (strcmp(key, "") != 0)
4694                 return -EINVAL;
4695
4696         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4697 }
4698
4699 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4700                                    void *buf, size_t buflen, int type)
4701 {
4702         if (strcmp(key, "") != 0)
4703                 return -EINVAL;
4704
4705         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4706 }
4707
4708 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4709                                        size_t list_len, const char *name,
4710                                        size_t name_len, int type)
4711 {
4712         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4713
4714         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4715                 return 0;
4716
4717         if (list && len <= list_len)
4718                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4719         return len;
4720 }
4721
4722 /*
4723  * nfs_fhget will use either the mounted_on_fileid or the fileid
4724  */
4725 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4726 {
4727         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4728                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4729               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4730               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4731                 return;
4732
4733         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4734                 NFS_ATTR_FATTR_NLINK;
4735         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4736         fattr->nlink = 2;
4737 }
4738
4739 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4740                 struct nfs4_fs_locations *fs_locations, struct page *page)
4741 {
4742         struct nfs_server *server = NFS_SERVER(dir);
4743         u32 bitmask[2] = {
4744                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4745         };
4746         struct nfs4_fs_locations_arg args = {
4747                 .dir_fh = NFS_FH(dir),
4748                 .name = name,
4749                 .page = page,
4750                 .bitmask = bitmask,
4751         };
4752         struct nfs4_fs_locations_res res = {
4753                 .fs_locations = fs_locations,
4754         };
4755         struct rpc_message msg = {
4756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4757                 .rpc_argp = &args,
4758                 .rpc_resp = &res,
4759         };
4760         int status;
4761
4762         dprintk("%s: start\n", __func__);
4763
4764         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4765          * is not supported */
4766         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4767                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4768         else
4769                 bitmask[0] |= FATTR4_WORD0_FILEID;
4770
4771         nfs_fattr_init(&fs_locations->fattr);
4772         fs_locations->server = server;
4773         fs_locations->nlocations = 0;
4774         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4775         dprintk("%s: returned status = %d\n", __func__, status);
4776         return status;
4777 }
4778
4779 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4780 {
4781         int status;
4782         struct nfs4_secinfo_arg args = {
4783                 .dir_fh = NFS_FH(dir),
4784                 .name   = name,
4785         };
4786         struct nfs4_secinfo_res res = {
4787                 .flavors     = flavors,
4788         };
4789         struct rpc_message msg = {
4790                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4791                 .rpc_argp = &args,
4792                 .rpc_resp = &res,
4793         };
4794
4795         dprintk("NFS call  secinfo %s\n", name->name);
4796         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4797         dprintk("NFS reply  secinfo: %d\n", status);
4798         return status;
4799 }
4800
4801 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4802 {
4803         struct nfs4_exception exception = { };
4804         int err;
4805         do {
4806                 err = nfs4_handle_exception(NFS_SERVER(dir),
4807                                 _nfs4_proc_secinfo(dir, name, flavors),
4808                                 &exception);
4809         } while (exception.retry);
4810         return err;
4811 }
4812
4813 #ifdef CONFIG_NFS_V4_1
4814 /*
4815  * Check the exchange flags returned by the server for invalid flags, having
4816  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4817  * DS flags set.
4818  */
4819 static int nfs4_check_cl_exchange_flags(u32 flags)
4820 {
4821         if (flags & ~EXCHGID4_FLAG_MASK_R)
4822                 goto out_inval;
4823         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4824             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4825                 goto out_inval;
4826         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4827                 goto out_inval;
4828         return NFS_OK;
4829 out_inval:
4830         return -NFS4ERR_INVAL;
4831 }
4832
4833 static bool
4834 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4835 {
4836         if (a->server_scope_sz == b->server_scope_sz &&
4837             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4838                 return true;
4839
4840         return false;
4841 }
4842
4843 /*
4844  * nfs4_proc_exchange_id()
4845  *
4846  * Since the clientid has expired, all compounds using sessions
4847  * associated with the stale clientid will be returning
4848  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4849  * be in some phase of session reset.
4850  */
4851 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4852 {
4853         nfs4_verifier verifier;
4854         struct nfs41_exchange_id_args args = {
4855                 .client = clp,
4856                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4857         };
4858         struct nfs41_exchange_id_res res = {
4859                 .client = clp,
4860         };
4861         int status;
4862         struct rpc_message msg = {
4863                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4864                 .rpc_argp = &args,
4865                 .rpc_resp = &res,
4866                 .rpc_cred = cred,
4867         };
4868         __be32 *p;
4869
4870         dprintk("--> %s\n", __func__);
4871         BUG_ON(clp == NULL);
4872
4873         p = (u32 *)verifier.data;
4874         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4875         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4876         args.verifier = &verifier;
4877
4878         args.id_len = scnprintf(args.id, sizeof(args.id),
4879                                 "%s/%s.%s/%u",
4880                                 clp->cl_ipaddr,
4881                                 init_utsname()->nodename,
4882                                 init_utsname()->domainname,
4883                                 clp->cl_rpcclient->cl_auth->au_flavor);
4884
4885         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4886         if (unlikely(!res.server_scope)) {
4887                 status = -ENOMEM;
4888                 goto out;
4889         }
4890
4891         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4892         if (!status)
4893                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4894
4895         if (!status) {
4896                 if (clp->server_scope &&
4897                     !nfs41_same_server_scope(clp->server_scope,
4898                                              res.server_scope)) {
4899                         dprintk("%s: server_scope mismatch detected\n",
4900                                 __func__);
4901                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4902                         kfree(clp->server_scope);
4903                         clp->server_scope = NULL;
4904                 }
4905
4906                 if (!clp->server_scope) {
4907                         clp->server_scope = res.server_scope;
4908                         goto out;
4909                 }
4910         }
4911         kfree(res.server_scope);
4912 out:
4913         dprintk("<-- %s status= %d\n", __func__, status);
4914         return status;
4915 }
4916
4917 struct nfs4_get_lease_time_data {
4918         struct nfs4_get_lease_time_args *args;
4919         struct nfs4_get_lease_time_res *res;
4920         struct nfs_client *clp;
4921 };
4922
4923 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4924                                         void *calldata)
4925 {
4926         int ret;
4927         struct nfs4_get_lease_time_data *data =
4928                         (struct nfs4_get_lease_time_data *)calldata;
4929
4930         dprintk("--> %s\n", __func__);
4931         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4932         /* just setup sequence, do not trigger session recovery
4933            since we're invoked within one */
4934         ret = nfs41_setup_sequence(data->clp->cl_session,
4935                                    &data->args->la_seq_args,
4936                                    &data->res->lr_seq_res, 0, task);
4937
4938         BUG_ON(ret == -EAGAIN);
4939         rpc_call_start(task);
4940         dprintk("<-- %s\n", __func__);
4941 }
4942
4943 /*
4944  * Called from nfs4_state_manager thread for session setup, so don't recover
4945  * from sequence operation or clientid errors.
4946  */
4947 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4948 {
4949         struct nfs4_get_lease_time_data *data =
4950                         (struct nfs4_get_lease_time_data *)calldata;
4951
4952         dprintk("--> %s\n", __func__);
4953         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4954                 return;
4955         switch (task->tk_status) {
4956         case -NFS4ERR_DELAY:
4957         case -NFS4ERR_GRACE:
4958                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4959                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4960                 task->tk_status = 0;
4961                 /* fall through */
4962         case -NFS4ERR_RETRY_UNCACHED_REP:
4963                 rpc_restart_call_prepare(task);
4964                 return;
4965         }
4966         dprintk("<-- %s\n", __func__);
4967 }
4968
4969 struct rpc_call_ops nfs4_get_lease_time_ops = {
4970         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4971         .rpc_call_done = nfs4_get_lease_time_done,
4972 };
4973
4974 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4975 {
4976         struct rpc_task *task;
4977         struct nfs4_get_lease_time_args args;
4978         struct nfs4_get_lease_time_res res = {
4979                 .lr_fsinfo = fsinfo,
4980         };
4981         struct nfs4_get_lease_time_data data = {
4982                 .args = &args,
4983                 .res = &res,
4984                 .clp = clp,
4985         };
4986         struct rpc_message msg = {
4987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4988                 .rpc_argp = &args,
4989                 .rpc_resp = &res,
4990         };
4991         struct rpc_task_setup task_setup = {
4992                 .rpc_client = clp->cl_rpcclient,
4993                 .rpc_message = &msg,
4994                 .callback_ops = &nfs4_get_lease_time_ops,
4995                 .callback_data = &data,
4996                 .flags = RPC_TASK_TIMEOUT,
4997         };
4998         int status;
4999
5000         dprintk("--> %s\n", __func__);
5001         task = rpc_run_task(&task_setup);
5002
5003         if (IS_ERR(task))
5004                 status = PTR_ERR(task);
5005         else {
5006                 status = task->tk_status;
5007                 rpc_put_task(task);
5008         }
5009         dprintk("<-- %s return %d\n", __func__, status);
5010
5011         return status;
5012 }
5013
5014 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5015 {
5016         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5017 }
5018
5019 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5020                 struct nfs4_slot *new,
5021                 u32 max_slots,
5022                 u32 ivalue)
5023 {
5024         struct nfs4_slot *old = NULL;
5025         u32 i;
5026
5027         spin_lock(&tbl->slot_tbl_lock);
5028         if (new) {
5029                 old = tbl->slots;
5030                 tbl->slots = new;
5031                 tbl->max_slots = max_slots;
5032         }
5033         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5034         for (i = 0; i < tbl->max_slots; i++)
5035                 tbl->slots[i].seq_nr = ivalue;
5036         spin_unlock(&tbl->slot_tbl_lock);
5037         kfree(old);
5038 }
5039
5040 /*
5041  * (re)Initialise a slot table
5042  */
5043 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5044                                  u32 ivalue)
5045 {
5046         struct nfs4_slot *new = NULL;
5047         int ret = -ENOMEM;
5048
5049         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5050                 max_reqs, tbl->max_slots);
5051
5052         /* Does the newly negotiated max_reqs match the existing slot table? */
5053         if (max_reqs != tbl->max_slots) {
5054                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5055                 if (!new)
5056                         goto out;
5057         }
5058         ret = 0;
5059
5060         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5061         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5062                 tbl, tbl->slots, tbl->max_slots);
5063 out:
5064         dprintk("<-- %s: return %d\n", __func__, ret);
5065         return ret;
5066 }
5067
5068 /* Destroy the slot table */
5069 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5070 {
5071         if (session->fc_slot_table.slots != NULL) {
5072                 kfree(session->fc_slot_table.slots);
5073                 session->fc_slot_table.slots = NULL;
5074         }
5075         if (session->bc_slot_table.slots != NULL) {
5076                 kfree(session->bc_slot_table.slots);
5077                 session->bc_slot_table.slots = NULL;
5078         }
5079         return;
5080 }
5081
5082 /*
5083  * Initialize or reset the forechannel and backchannel tables
5084  */
5085 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5086 {
5087         struct nfs4_slot_table *tbl;
5088         int status;
5089
5090         dprintk("--> %s\n", __func__);
5091         /* Fore channel */
5092         tbl = &ses->fc_slot_table;
5093         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5094         if (status) /* -ENOMEM */
5095                 return status;
5096         /* Back channel */
5097         tbl = &ses->bc_slot_table;
5098         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5099         if (status && tbl->slots == NULL)
5100                 /* Fore and back channel share a connection so get
5101                  * both slot tables or neither */
5102                 nfs4_destroy_slot_tables(ses);
5103         return status;
5104 }
5105
5106 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5107 {
5108         struct nfs4_session *session;
5109         struct nfs4_slot_table *tbl;
5110
5111         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5112         if (!session)
5113                 return NULL;
5114
5115         tbl = &session->fc_slot_table;
5116         tbl->highest_used_slotid = -1;
5117         spin_lock_init(&tbl->slot_tbl_lock);
5118         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5119         init_completion(&tbl->complete);
5120
5121         tbl = &session->bc_slot_table;
5122         tbl->highest_used_slotid = -1;
5123         spin_lock_init(&tbl->slot_tbl_lock);
5124         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5125         init_completion(&tbl->complete);
5126
5127         session->session_state = 1<<NFS4_SESSION_INITING;
5128
5129         session->clp = clp;
5130         return session;
5131 }
5132
5133 void nfs4_destroy_session(struct nfs4_session *session)
5134 {
5135         nfs4_proc_destroy_session(session);
5136         dprintk("%s Destroy backchannel for xprt %p\n",
5137                 __func__, session->clp->cl_rpcclient->cl_xprt);
5138         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5139                                 NFS41_BC_MIN_CALLBACKS);
5140         nfs4_destroy_slot_tables(session);
5141         kfree(session);
5142 }
5143
5144 /*
5145  * Initialize the values to be used by the client in CREATE_SESSION
5146  * If nfs4_init_session set the fore channel request and response sizes,
5147  * use them.
5148  *
5149  * Set the back channel max_resp_sz_cached to zero to force the client to
5150  * always set csa_cachethis to FALSE because the current implementation
5151  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5152  */
5153 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5154 {
5155         struct nfs4_session *session = args->client->cl_session;
5156         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5157                      mxresp_sz = session->fc_attrs.max_resp_sz;
5158
5159         if (mxrqst_sz == 0)
5160                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5161         if (mxresp_sz == 0)
5162                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5163         /* Fore channel attributes */
5164         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5165         args->fc_attrs.max_resp_sz = mxresp_sz;
5166         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5167         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5168
5169         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5170                 "max_ops=%u max_reqs=%u\n",
5171                 __func__,
5172                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5173                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5174
5175         /* Back channel attributes */
5176         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5177         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5178         args->bc_attrs.max_resp_sz_cached = 0;
5179         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5180         args->bc_attrs.max_reqs = 1;
5181
5182         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5183                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5184                 __func__,
5185                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5186                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5187                 args->bc_attrs.max_reqs);
5188 }
5189
5190 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5191 {
5192         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5193         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5194
5195         if (rcvd->max_resp_sz > sent->max_resp_sz)
5196                 return -EINVAL;
5197         /*
5198          * Our requested max_ops is the minimum we need; we're not
5199          * prepared to break up compounds into smaller pieces than that.
5200          * So, no point even trying to continue if the server won't
5201          * cooperate:
5202          */
5203         if (rcvd->max_ops < sent->max_ops)
5204                 return -EINVAL;
5205         if (rcvd->max_reqs == 0)
5206                 return -EINVAL;
5207         return 0;
5208 }
5209
5210 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5211 {
5212         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5213         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5214
5215         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5216                 return -EINVAL;
5217         if (rcvd->max_resp_sz < sent->max_resp_sz)
5218                 return -EINVAL;
5219         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5220                 return -EINVAL;
5221         /* These would render the backchannel useless: */
5222         if (rcvd->max_ops  == 0)
5223                 return -EINVAL;
5224         if (rcvd->max_reqs == 0)
5225                 return -EINVAL;
5226         return 0;
5227 }
5228
5229 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5230                                      struct nfs4_session *session)
5231 {
5232         int ret;
5233
5234         ret = nfs4_verify_fore_channel_attrs(args, session);
5235         if (ret)
5236                 return ret;
5237         return nfs4_verify_back_channel_attrs(args, session);
5238 }
5239
5240 static int _nfs4_proc_create_session(struct nfs_client *clp)
5241 {
5242         struct nfs4_session *session = clp->cl_session;
5243         struct nfs41_create_session_args args = {
5244                 .client = clp,
5245                 .cb_program = NFS4_CALLBACK,
5246         };
5247         struct nfs41_create_session_res res = {
5248                 .client = clp,
5249         };
5250         struct rpc_message msg = {
5251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5252                 .rpc_argp = &args,
5253                 .rpc_resp = &res,
5254         };
5255         int status;
5256
5257         nfs4_init_channel_attrs(&args);
5258         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5259
5260         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5261
5262         if (!status)
5263                 /* Verify the session's negotiated channel_attrs values */
5264                 status = nfs4_verify_channel_attrs(&args, session);
5265         if (!status) {
5266                 /* Increment the clientid slot sequence id */
5267                 clp->cl_seqid++;
5268         }
5269
5270         return status;
5271 }
5272
5273 /*
5274  * Issues a CREATE_SESSION operation to the server.
5275  * It is the responsibility of the caller to verify the session is
5276  * expired before calling this routine.
5277  */
5278 int nfs4_proc_create_session(struct nfs_client *clp)
5279 {
5280         int status;
5281         unsigned *ptr;
5282         struct nfs4_session *session = clp->cl_session;
5283
5284         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5285
5286         status = _nfs4_proc_create_session(clp);
5287         if (status)
5288                 goto out;
5289
5290         /* Init or reset the session slot tables */
5291         status = nfs4_setup_session_slot_tables(session);
5292         dprintk("slot table setup returned %d\n", status);
5293         if (status)
5294                 goto out;
5295
5296         ptr = (unsigned *)&session->sess_id.data[0];
5297         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5298                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5299 out:
5300         dprintk("<-- %s\n", __func__);
5301         return status;
5302 }
5303
5304 /*
5305  * Issue the over-the-wire RPC DESTROY_SESSION.
5306  * The caller must serialize access to this routine.
5307  */
5308 int nfs4_proc_destroy_session(struct nfs4_session *session)
5309 {
5310         int status = 0;
5311         struct rpc_message msg;
5312
5313         dprintk("--> nfs4_proc_destroy_session\n");
5314
5315         /* session is still being setup */
5316         if (session->clp->cl_cons_state != NFS_CS_READY)
5317                 return status;
5318
5319         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5320         msg.rpc_argp = session;
5321         msg.rpc_resp = NULL;
5322         msg.rpc_cred = NULL;
5323         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5324
5325         if (status)
5326                 printk(KERN_WARNING
5327                         "Got error %d from the server on DESTROY_SESSION. "
5328                         "Session has been destroyed regardless...\n", status);
5329
5330         dprintk("<-- nfs4_proc_destroy_session\n");
5331         return status;
5332 }
5333
5334 int nfs4_init_session(struct nfs_server *server)
5335 {
5336         struct nfs_client *clp = server->nfs_client;
5337         struct nfs4_session *session;
5338         unsigned int rsize, wsize;
5339         int ret;
5340
5341         if (!nfs4_has_session(clp))
5342                 return 0;
5343
5344         session = clp->cl_session;
5345         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5346                 return 0;
5347
5348         rsize = server->rsize;
5349         if (rsize == 0)
5350                 rsize = NFS_MAX_FILE_IO_SIZE;
5351         wsize = server->wsize;
5352         if (wsize == 0)
5353                 wsize = NFS_MAX_FILE_IO_SIZE;
5354
5355         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5356         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5357
5358         ret = nfs4_recover_expired_lease(server);
5359         if (!ret)
5360                 ret = nfs4_check_client_ready(clp);
5361         return ret;
5362 }
5363
5364 int nfs4_init_ds_session(struct nfs_client *clp)
5365 {
5366         struct nfs4_session *session = clp->cl_session;
5367         int ret;
5368
5369         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5370                 return 0;
5371
5372         ret = nfs4_client_recover_expired_lease(clp);
5373         if (!ret)
5374                 /* Test for the DS role */
5375                 if (!is_ds_client(clp))
5376                         ret = -ENODEV;
5377         if (!ret)
5378                 ret = nfs4_check_client_ready(clp);
5379         return ret;
5380
5381 }
5382 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5383
5384
5385 /*
5386  * Renew the cl_session lease.
5387  */
5388 struct nfs4_sequence_data {
5389         struct nfs_client *clp;
5390         struct nfs4_sequence_args args;
5391         struct nfs4_sequence_res res;
5392 };
5393
5394 static void nfs41_sequence_release(void *data)
5395 {
5396         struct nfs4_sequence_data *calldata = data;
5397         struct nfs_client *clp = calldata->clp;
5398
5399         if (atomic_read(&clp->cl_count) > 1)
5400                 nfs4_schedule_state_renewal(clp);
5401         nfs_put_client(clp);
5402         kfree(calldata);
5403 }
5404
5405 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5406 {
5407         switch(task->tk_status) {
5408         case -NFS4ERR_DELAY:
5409                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5410                 return -EAGAIN;
5411         default:
5412                 nfs4_schedule_lease_recovery(clp);
5413         }
5414         return 0;
5415 }
5416
5417 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5418 {
5419         struct nfs4_sequence_data *calldata = data;
5420         struct nfs_client *clp = calldata->clp;
5421
5422         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5423                 return;
5424
5425         if (task->tk_status < 0) {
5426                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5427                 if (atomic_read(&clp->cl_count) == 1)
5428                         goto out;
5429
5430                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5431                         rpc_restart_call_prepare(task);
5432                         return;
5433                 }
5434         }
5435         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5436 out:
5437         dprintk("<-- %s\n", __func__);
5438 }
5439
5440 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5441 {
5442         struct nfs4_sequence_data *calldata = data;
5443         struct nfs_client *clp = calldata->clp;
5444         struct nfs4_sequence_args *args;
5445         struct nfs4_sequence_res *res;
5446
5447         args = task->tk_msg.rpc_argp;
5448         res = task->tk_msg.rpc_resp;
5449
5450         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5451                 return;
5452         rpc_call_start(task);
5453 }
5454
5455 static const struct rpc_call_ops nfs41_sequence_ops = {
5456         .rpc_call_done = nfs41_sequence_call_done,
5457         .rpc_call_prepare = nfs41_sequence_prepare,
5458         .rpc_release = nfs41_sequence_release,
5459 };
5460
5461 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5462 {
5463         struct nfs4_sequence_data *calldata;
5464         struct rpc_message msg = {
5465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5466                 .rpc_cred = cred,
5467         };
5468         struct rpc_task_setup task_setup_data = {
5469                 .rpc_client = clp->cl_rpcclient,
5470                 .rpc_message = &msg,
5471                 .callback_ops = &nfs41_sequence_ops,
5472                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5473         };
5474
5475         if (!atomic_inc_not_zero(&clp->cl_count))
5476                 return ERR_PTR(-EIO);
5477         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5478         if (calldata == NULL) {
5479                 nfs_put_client(clp);
5480                 return ERR_PTR(-ENOMEM);
5481         }
5482         msg.rpc_argp = &calldata->args;
5483         msg.rpc_resp = &calldata->res;
5484         calldata->clp = clp;
5485         task_setup_data.callback_data = calldata;
5486
5487         return rpc_run_task(&task_setup_data);
5488 }
5489
5490 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5491 {
5492         struct rpc_task *task;
5493         int ret = 0;
5494
5495         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5496                 return 0;
5497         task = _nfs41_proc_sequence(clp, cred);
5498         if (IS_ERR(task))
5499                 ret = PTR_ERR(task);
5500         else
5501                 rpc_put_task_async(task);
5502         dprintk("<-- %s status=%d\n", __func__, ret);
5503         return ret;
5504 }
5505
5506 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5507 {
5508         struct rpc_task *task;
5509         int ret;
5510
5511         task = _nfs41_proc_sequence(clp, cred);
5512         if (IS_ERR(task)) {
5513                 ret = PTR_ERR(task);
5514                 goto out;
5515         }
5516         ret = rpc_wait_for_completion_task(task);
5517         if (!ret) {
5518                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5519
5520                 if (task->tk_status == 0)
5521                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5522                 ret = task->tk_status;
5523         }
5524         rpc_put_task(task);
5525 out:
5526         dprintk("<-- %s status=%d\n", __func__, ret);
5527         return ret;
5528 }
5529
5530 struct nfs4_reclaim_complete_data {
5531         struct nfs_client *clp;
5532         struct nfs41_reclaim_complete_args arg;
5533         struct nfs41_reclaim_complete_res res;
5534 };
5535
5536 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5537 {
5538         struct nfs4_reclaim_complete_data *calldata = data;
5539
5540         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5541         if (nfs41_setup_sequence(calldata->clp->cl_session,
5542                                 &calldata->arg.seq_args,
5543                                 &calldata->res.seq_res, 0, task))
5544                 return;
5545
5546         rpc_call_start(task);
5547 }
5548
5549 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5550 {
5551         switch(task->tk_status) {
5552         case 0:
5553         case -NFS4ERR_COMPLETE_ALREADY:
5554         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5555                 break;
5556         case -NFS4ERR_DELAY:
5557                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5558                 /* fall through */
5559         case -NFS4ERR_RETRY_UNCACHED_REP:
5560                 return -EAGAIN;
5561         default:
5562                 nfs4_schedule_lease_recovery(clp);
5563         }
5564         return 0;
5565 }
5566
5567 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5568 {
5569         struct nfs4_reclaim_complete_data *calldata = data;
5570         struct nfs_client *clp = calldata->clp;
5571         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5572
5573         dprintk("--> %s\n", __func__);
5574         if (!nfs41_sequence_done(task, res))
5575                 return;
5576
5577         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5578                 rpc_restart_call_prepare(task);
5579                 return;
5580         }
5581         dprintk("<-- %s\n", __func__);
5582 }
5583
5584 static void nfs4_free_reclaim_complete_data(void *data)
5585 {
5586         struct nfs4_reclaim_complete_data *calldata = data;
5587
5588         kfree(calldata);
5589 }
5590
5591 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5592         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5593         .rpc_call_done = nfs4_reclaim_complete_done,
5594         .rpc_release = nfs4_free_reclaim_complete_data,
5595 };
5596
5597 /*
5598  * Issue a global reclaim complete.
5599  */
5600 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5601 {
5602         struct nfs4_reclaim_complete_data *calldata;
5603         struct rpc_task *task;
5604         struct rpc_message msg = {
5605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5606         };
5607         struct rpc_task_setup task_setup_data = {
5608                 .rpc_client = clp->cl_rpcclient,
5609                 .rpc_message = &msg,
5610                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5611                 .flags = RPC_TASK_ASYNC,
5612         };
5613         int status = -ENOMEM;
5614
5615         dprintk("--> %s\n", __func__);
5616         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5617         if (calldata == NULL)
5618                 goto out;
5619         calldata->clp = clp;
5620         calldata->arg.one_fs = 0;
5621
5622         msg.rpc_argp = &calldata->arg;
5623         msg.rpc_resp = &calldata->res;
5624         task_setup_data.callback_data = calldata;
5625         task = rpc_run_task(&task_setup_data);
5626         if (IS_ERR(task)) {
5627                 status = PTR_ERR(task);
5628                 goto out;
5629         }
5630         status = nfs4_wait_for_completion_rpc_task(task);
5631         if (status == 0)
5632                 status = task->tk_status;
5633         rpc_put_task(task);
5634         return 0;
5635 out:
5636         dprintk("<-- %s status=%d\n", __func__, status);
5637         return status;
5638 }
5639
5640 static void
5641 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5642 {
5643         struct nfs4_layoutget *lgp = calldata;
5644         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5645
5646         dprintk("--> %s\n", __func__);
5647         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5648          * right now covering the LAYOUTGET we are about to send.
5649          * However, that is not so catastrophic, and there seems
5650          * to be no way to prevent it completely.
5651          */
5652         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5653                                 &lgp->res.seq_res, 0, task))
5654                 return;
5655         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5656                                           NFS_I(lgp->args.inode)->layout,
5657                                           lgp->args.ctx->state)) {
5658                 rpc_exit(task, NFS4_OK);
5659                 return;
5660         }
5661         rpc_call_start(task);
5662 }
5663
5664 static void nfs4_layoutget_done(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
5671         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5672                 return;
5673
5674         switch (task->tk_status) {
5675         case 0:
5676                 break;
5677         case -NFS4ERR_LAYOUTTRYLATER:
5678         case -NFS4ERR_RECALLCONFLICT:
5679                 task->tk_status = -NFS4ERR_DELAY;
5680                 /* Fall through */
5681         default:
5682                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5683                         rpc_restart_call_prepare(task);
5684                         return;
5685                 }
5686         }
5687         dprintk("<-- %s\n", __func__);
5688 }
5689
5690 static void nfs4_layoutget_release(void *calldata)
5691 {
5692         struct nfs4_layoutget *lgp = calldata;
5693
5694         dprintk("--> %s\n", __func__);
5695         put_nfs_open_context(lgp->args.ctx);
5696         kfree(calldata);
5697         dprintk("<-- %s\n", __func__);
5698 }
5699
5700 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5701         .rpc_call_prepare = nfs4_layoutget_prepare,
5702         .rpc_call_done = nfs4_layoutget_done,
5703         .rpc_release = nfs4_layoutget_release,
5704 };
5705
5706 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5707 {
5708         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5709         struct rpc_task *task;
5710         struct rpc_message msg = {
5711                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5712                 .rpc_argp = &lgp->args,
5713                 .rpc_resp = &lgp->res,
5714         };
5715         struct rpc_task_setup task_setup_data = {
5716                 .rpc_client = server->client,
5717                 .rpc_message = &msg,
5718                 .callback_ops = &nfs4_layoutget_call_ops,
5719                 .callback_data = lgp,
5720                 .flags = RPC_TASK_ASYNC,
5721         };
5722         int status = 0;
5723
5724         dprintk("--> %s\n", __func__);
5725
5726         lgp->res.layoutp = &lgp->args.layout;
5727         lgp->res.seq_res.sr_slot = NULL;
5728         task = rpc_run_task(&task_setup_data);
5729         if (IS_ERR(task))
5730                 return PTR_ERR(task);
5731         status = nfs4_wait_for_completion_rpc_task(task);
5732         if (status == 0)
5733                 status = task->tk_status;
5734         if (status == 0)
5735                 status = pnfs_layout_process(lgp);
5736         rpc_put_task(task);
5737         dprintk("<-- %s status=%d\n", __func__, status);
5738         return status;
5739 }
5740
5741 static void
5742 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5743 {
5744         struct nfs4_layoutreturn *lrp = calldata;
5745
5746         dprintk("--> %s\n", __func__);
5747         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5748                                 &lrp->res.seq_res, 0, task))
5749                 return;
5750         rpc_call_start(task);
5751 }
5752
5753 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5754 {
5755         struct nfs4_layoutreturn *lrp = calldata;
5756         struct nfs_server *server;
5757         struct pnfs_layout_hdr *lo = lrp->args.layout;
5758
5759         dprintk("--> %s\n", __func__);
5760
5761         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5762                 return;
5763
5764         server = NFS_SERVER(lrp->args.inode);
5765         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5766                 rpc_restart_call_prepare(task);
5767                 return;
5768         }
5769         spin_lock(&lo->plh_inode->i_lock);
5770         if (task->tk_status == 0) {
5771                 if (lrp->res.lrs_present) {
5772                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5773                 } else
5774                         BUG_ON(!list_empty(&lo->plh_segs));
5775         }
5776         lo->plh_block_lgets--;
5777         spin_unlock(&lo->plh_inode->i_lock);
5778         dprintk("<-- %s\n", __func__);
5779 }
5780
5781 static void nfs4_layoutreturn_release(void *calldata)
5782 {
5783         struct nfs4_layoutreturn *lrp = calldata;
5784
5785         dprintk("--> %s\n", __func__);
5786         put_layout_hdr(lrp->args.layout);
5787         kfree(calldata);
5788         dprintk("<-- %s\n", __func__);
5789 }
5790
5791 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5792         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5793         .rpc_call_done = nfs4_layoutreturn_done,
5794         .rpc_release = nfs4_layoutreturn_release,
5795 };
5796
5797 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5798 {
5799         struct rpc_task *task;
5800         struct rpc_message msg = {
5801                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5802                 .rpc_argp = &lrp->args,
5803                 .rpc_resp = &lrp->res,
5804         };
5805         struct rpc_task_setup task_setup_data = {
5806                 .rpc_client = lrp->clp->cl_rpcclient,
5807                 .rpc_message = &msg,
5808                 .callback_ops = &nfs4_layoutreturn_call_ops,
5809                 .callback_data = lrp,
5810         };
5811         int status;
5812
5813         dprintk("--> %s\n", __func__);
5814         task = rpc_run_task(&task_setup_data);
5815         if (IS_ERR(task))
5816                 return PTR_ERR(task);
5817         status = task->tk_status;
5818         dprintk("<-- %s status=%d\n", __func__, status);
5819         rpc_put_task(task);
5820         return status;
5821 }
5822
5823 /*
5824  * Retrieve the list of Data Server devices from the MDS.
5825  */
5826 static int _nfs4_getdevicelist(struct nfs_server *server,
5827                                     const struct nfs_fh *fh,
5828                                     struct pnfs_devicelist *devlist)
5829 {
5830         struct nfs4_getdevicelist_args args = {
5831                 .fh = fh,
5832                 .layoutclass = server->pnfs_curr_ld->id,
5833         };
5834         struct nfs4_getdevicelist_res res = {
5835                 .devlist = devlist,
5836         };
5837         struct rpc_message msg = {
5838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5839                 .rpc_argp = &args,
5840                 .rpc_resp = &res,
5841         };
5842         int status;
5843
5844         dprintk("--> %s\n", __func__);
5845         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5846                                 &res.seq_res, 0);
5847         dprintk("<-- %s status=%d\n", __func__, status);
5848         return status;
5849 }
5850
5851 int nfs4_proc_getdevicelist(struct nfs_server *server,
5852                             const struct nfs_fh *fh,
5853                             struct pnfs_devicelist *devlist)
5854 {
5855         struct nfs4_exception exception = { };
5856         int err;
5857
5858         do {
5859                 err = nfs4_handle_exception(server,
5860                                 _nfs4_getdevicelist(server, fh, devlist),
5861                                 &exception);
5862         } while (exception.retry);
5863
5864         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5865                 err, devlist->num_devs);
5866
5867         return err;
5868 }
5869 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5870
5871 static int
5872 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5873 {
5874         struct nfs4_getdeviceinfo_args args = {
5875                 .pdev = pdev,
5876         };
5877         struct nfs4_getdeviceinfo_res res = {
5878                 .pdev = pdev,
5879         };
5880         struct rpc_message msg = {
5881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5882                 .rpc_argp = &args,
5883                 .rpc_resp = &res,
5884         };
5885         int status;
5886
5887         dprintk("--> %s\n", __func__);
5888         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5889         dprintk("<-- %s status=%d\n", __func__, status);
5890
5891         return status;
5892 }
5893
5894 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5895 {
5896         struct nfs4_exception exception = { };
5897         int err;
5898
5899         do {
5900                 err = nfs4_handle_exception(server,
5901                                         _nfs4_proc_getdeviceinfo(server, pdev),
5902                                         &exception);
5903         } while (exception.retry);
5904         return err;
5905 }
5906 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5907
5908 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5909 {
5910         struct nfs4_layoutcommit_data *data = calldata;
5911         struct nfs_server *server = NFS_SERVER(data->args.inode);
5912
5913         if (nfs4_setup_sequence(server, &data->args.seq_args,
5914                                 &data->res.seq_res, 1, task))
5915                 return;
5916         rpc_call_start(task);
5917 }
5918
5919 static void
5920 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5921 {
5922         struct nfs4_layoutcommit_data *data = calldata;
5923         struct nfs_server *server = NFS_SERVER(data->args.inode);
5924
5925         if (!nfs4_sequence_done(task, &data->res.seq_res))
5926                 return;
5927
5928         switch (task->tk_status) { /* Just ignore these failures */
5929         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5930         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5931         case NFS4ERR_BADLAYOUT:     /* no layout */
5932         case NFS4ERR_GRACE:         /* loca_recalim always false */
5933                 task->tk_status = 0;
5934         }
5935
5936         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5937                 rpc_restart_call_prepare(task);
5938                 return;
5939         }
5940
5941         if (task->tk_status == 0)
5942                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5943                                                    data->res.fattr);
5944 }
5945
5946 static void nfs4_layoutcommit_release(void *calldata)
5947 {
5948         struct nfs4_layoutcommit_data *data = calldata;
5949         struct pnfs_layout_segment *lseg, *tmp;
5950         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5951
5952         pnfs_cleanup_layoutcommit(data);
5953         /* Matched by references in pnfs_set_layoutcommit */
5954         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5955                 list_del_init(&lseg->pls_lc_list);
5956                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5957                                        &lseg->pls_flags))
5958                         put_lseg(lseg);
5959         }
5960
5961         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
5962         smp_mb__after_clear_bit();
5963         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
5964
5965         put_rpccred(data->cred);
5966         kfree(data);
5967 }
5968
5969 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5970         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5971         .rpc_call_done = nfs4_layoutcommit_done,
5972         .rpc_release = nfs4_layoutcommit_release,
5973 };
5974
5975 int
5976 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5977 {
5978         struct rpc_message msg = {
5979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5980                 .rpc_argp = &data->args,
5981                 .rpc_resp = &data->res,
5982                 .rpc_cred = data->cred,
5983         };
5984         struct rpc_task_setup task_setup_data = {
5985                 .task = &data->task,
5986                 .rpc_client = NFS_CLIENT(data->args.inode),
5987                 .rpc_message = &msg,
5988                 .callback_ops = &nfs4_layoutcommit_ops,
5989                 .callback_data = data,
5990                 .flags = RPC_TASK_ASYNC,
5991         };
5992         struct rpc_task *task;
5993         int status = 0;
5994
5995         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5996                 "lbw: %llu inode %lu\n",
5997                 data->task.tk_pid, sync,
5998                 data->args.lastbytewritten,
5999                 data->args.inode->i_ino);
6000
6001         task = rpc_run_task(&task_setup_data);
6002         if (IS_ERR(task))
6003                 return PTR_ERR(task);
6004         if (sync == false)
6005                 goto out;
6006         status = nfs4_wait_for_completion_rpc_task(task);
6007         if (status != 0)
6008                 goto out;
6009         status = task->tk_status;
6010 out:
6011         dprintk("%s: status %d\n", __func__, status);
6012         rpc_put_task(task);
6013         return status;
6014 }
6015
6016 static int
6017 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6018                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6019 {
6020         struct nfs41_secinfo_no_name_args args = {
6021                 .style = SECINFO_STYLE_CURRENT_FH,
6022         };
6023         struct nfs4_secinfo_res res = {
6024                 .flavors = flavors,
6025         };
6026         struct rpc_message msg = {
6027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6028                 .rpc_argp = &args,
6029                 .rpc_resp = &res,
6030         };
6031         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6032 }
6033
6034 static int
6035 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6036                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6037 {
6038         struct nfs4_exception exception = { };
6039         int err;
6040         do {
6041                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6042                 switch (err) {
6043                 case 0:
6044                 case -NFS4ERR_WRONGSEC:
6045                 case -NFS4ERR_NOTSUPP:
6046                         break;
6047                 default:
6048                         err = nfs4_handle_exception(server, err, &exception);
6049                 }
6050         } while (exception.retry);
6051         return err;
6052 }
6053
6054 static int
6055 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6056                     struct nfs_fsinfo *info)
6057 {
6058         int err;
6059         struct page *page;
6060         rpc_authflavor_t flavor;
6061         struct nfs4_secinfo_flavors *flavors;
6062
6063         page = alloc_page(GFP_KERNEL);
6064         if (!page) {
6065                 err = -ENOMEM;
6066                 goto out;
6067         }
6068
6069         flavors = page_address(page);
6070         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6071
6072         /*
6073          * Fall back on "guess and check" method if
6074          * the server doesn't support SECINFO_NO_NAME
6075          */
6076         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6077                 err = nfs4_find_root_sec(server, fhandle, info);
6078                 goto out_freepage;
6079         }
6080         if (err)
6081                 goto out_freepage;
6082
6083         flavor = nfs_find_best_sec(flavors);
6084         if (err == 0)
6085                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6086
6087 out_freepage:
6088         put_page(page);
6089         if (err == -EACCES)
6090                 return -EPERM;
6091 out:
6092         return err;
6093 }
6094 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6095 {
6096         int status;
6097         struct nfs41_test_stateid_args args = {
6098                 .stateid = &state->stateid,
6099         };
6100         struct nfs41_test_stateid_res res;
6101         struct rpc_message msg = {
6102                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6103                 .rpc_argp = &args,
6104                 .rpc_resp = &res,
6105         };
6106         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6107         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6108         return status;
6109 }
6110
6111 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6112 {
6113         struct nfs4_exception exception = { };
6114         int err;
6115         do {
6116                 err = nfs4_handle_exception(server,
6117                                 _nfs41_test_stateid(server, state),
6118                                 &exception);
6119         } while (exception.retry);
6120         return err;
6121 }
6122
6123 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6124 {
6125         int status;
6126         struct nfs41_free_stateid_args args = {
6127                 .stateid = &state->stateid,
6128         };
6129         struct nfs41_free_stateid_res res;
6130         struct rpc_message msg = {
6131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6132                 .rpc_argp = &args,
6133                 .rpc_resp = &res,
6134         };
6135
6136         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6137         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6138         return status;
6139 }
6140
6141 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6142 {
6143         struct nfs4_exception exception = { };
6144         int err;
6145         do {
6146                 err = nfs4_handle_exception(server,
6147                                 _nfs4_free_stateid(server, state),
6148                                 &exception);
6149         } while (exception.retry);
6150         return err;
6151 }
6152 #endif /* CONFIG_NFS_V4_1 */
6153
6154 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6155         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6156         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6157         .recover_open   = nfs4_open_reclaim,
6158         .recover_lock   = nfs4_lock_reclaim,
6159         .establish_clid = nfs4_init_clientid,
6160         .get_clid_cred  = nfs4_get_setclientid_cred,
6161 };
6162
6163 #if defined(CONFIG_NFS_V4_1)
6164 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6165         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6166         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6167         .recover_open   = nfs4_open_reclaim,
6168         .recover_lock   = nfs4_lock_reclaim,
6169         .establish_clid = nfs41_init_clientid,
6170         .get_clid_cred  = nfs4_get_exchange_id_cred,
6171         .reclaim_complete = nfs41_proc_reclaim_complete,
6172 };
6173 #endif /* CONFIG_NFS_V4_1 */
6174
6175 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6176         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6177         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6178         .recover_open   = nfs4_open_expired,
6179         .recover_lock   = nfs4_lock_expired,
6180         .establish_clid = nfs4_init_clientid,
6181         .get_clid_cred  = nfs4_get_setclientid_cred,
6182 };
6183
6184 #if defined(CONFIG_NFS_V4_1)
6185 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6186         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6187         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6188         .recover_open   = nfs41_open_expired,
6189         .recover_lock   = nfs41_lock_expired,
6190         .establish_clid = nfs41_init_clientid,
6191         .get_clid_cred  = nfs4_get_exchange_id_cred,
6192 };
6193 #endif /* CONFIG_NFS_V4_1 */
6194
6195 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6196         .sched_state_renewal = nfs4_proc_async_renew,
6197         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6198         .renew_lease = nfs4_proc_renew,
6199 };
6200
6201 #if defined(CONFIG_NFS_V4_1)
6202 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6203         .sched_state_renewal = nfs41_proc_async_sequence,
6204         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6205         .renew_lease = nfs4_proc_sequence,
6206 };
6207 #endif
6208
6209 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6210         .minor_version = 0,
6211         .call_sync = _nfs4_call_sync,
6212         .validate_stateid = nfs4_validate_delegation_stateid,
6213         .find_root_sec = nfs4_find_root_sec,
6214         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6215         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6216         .state_renewal_ops = &nfs40_state_renewal_ops,
6217 };
6218
6219 #if defined(CONFIG_NFS_V4_1)
6220 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6221         .minor_version = 1,
6222         .call_sync = _nfs4_call_sync_session,
6223         .validate_stateid = nfs41_validate_delegation_stateid,
6224         .find_root_sec = nfs41_find_root_sec,
6225         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6226         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6227         .state_renewal_ops = &nfs41_state_renewal_ops,
6228 };
6229 #endif
6230
6231 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6232         [0] = &nfs_v4_0_minor_ops,
6233 #if defined(CONFIG_NFS_V4_1)
6234         [1] = &nfs_v4_1_minor_ops,
6235 #endif
6236 };
6237
6238 static const struct inode_operations nfs4_file_inode_operations = {
6239         .permission     = nfs_permission,
6240         .getattr        = nfs_getattr,
6241         .setattr        = nfs_setattr,
6242         .getxattr       = generic_getxattr,
6243         .setxattr       = generic_setxattr,
6244         .listxattr      = generic_listxattr,
6245         .removexattr    = generic_removexattr,
6246 };
6247
6248 const struct nfs_rpc_ops nfs_v4_clientops = {
6249         .version        = 4,                    /* protocol version */
6250         .dentry_ops     = &nfs4_dentry_operations,
6251         .dir_inode_ops  = &nfs4_dir_inode_operations,
6252         .file_inode_ops = &nfs4_file_inode_operations,
6253         .file_ops       = &nfs4_file_operations,
6254         .getroot        = nfs4_proc_get_root,
6255         .getattr        = nfs4_proc_getattr,
6256         .setattr        = nfs4_proc_setattr,
6257         .lookup         = nfs4_proc_lookup,
6258         .access         = nfs4_proc_access,
6259         .readlink       = nfs4_proc_readlink,
6260         .create         = nfs4_proc_create,
6261         .remove         = nfs4_proc_remove,
6262         .unlink_setup   = nfs4_proc_unlink_setup,
6263         .unlink_done    = nfs4_proc_unlink_done,
6264         .rename         = nfs4_proc_rename,
6265         .rename_setup   = nfs4_proc_rename_setup,
6266         .rename_done    = nfs4_proc_rename_done,
6267         .link           = nfs4_proc_link,
6268         .symlink        = nfs4_proc_symlink,
6269         .mkdir          = nfs4_proc_mkdir,
6270         .rmdir          = nfs4_proc_remove,
6271         .readdir        = nfs4_proc_readdir,
6272         .mknod          = nfs4_proc_mknod,
6273         .statfs         = nfs4_proc_statfs,
6274         .fsinfo         = nfs4_proc_fsinfo,
6275         .pathconf       = nfs4_proc_pathconf,
6276         .set_capabilities = nfs4_server_capabilities,
6277         .decode_dirent  = nfs4_decode_dirent,
6278         .read_setup     = nfs4_proc_read_setup,
6279         .read_done      = nfs4_read_done,
6280         .write_setup    = nfs4_proc_write_setup,
6281         .write_done     = nfs4_write_done,
6282         .commit_setup   = nfs4_proc_commit_setup,
6283         .commit_done    = nfs4_commit_done,
6284         .lock           = nfs4_proc_lock,
6285         .clear_acl_cache = nfs4_zap_acl_attr,
6286         .close_context  = nfs4_close_context,
6287         .open_context   = nfs4_atomic_open,
6288         .init_client    = nfs4_init_client,
6289         .secinfo        = nfs4_proc_secinfo,
6290 };
6291
6292 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6293         .prefix = XATTR_NAME_NFSV4_ACL,
6294         .list   = nfs4_xattr_list_nfs4_acl,
6295         .get    = nfs4_xattr_get_nfs4_acl,
6296         .set    = nfs4_xattr_set_nfs4_acl,
6297 };
6298
6299 const struct xattr_handler *nfs4_xattr_handlers[] = {
6300         &nfs4_xattr_nfs4_acl_handler,
6301         NULL
6302 };
6303
6304 /*
6305  * Local variables:
6306  *  c-basic-offset: 8
6307  * End:
6308  */