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 static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  82 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  83 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  84 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  85 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  86                             struct nfs_fattr *fattr, struct iattr *sattr,
  87                             struct nfs4_state *state);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  90 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  91 #endif
  92 /* Prevent leaks of NFSv4 errors into userland */
  93 static int nfs4_map_errors(int err)
  94 {
  95         if (err >= -1000)
  96                 return err;
  97         switch (err) {
  98         case -NFS4ERR_RESOURCE:
  99                 return -EREMOTEIO;
 100         case -NFS4ERR_WRONGSEC:
 101                 return -EPERM;
 102         case -NFS4ERR_BADOWNER:
 103         case -NFS4ERR_BADNAME:
 104                 return -EINVAL;
 105         default:
 106                 dprintk("%s could not handle NFSv4 error %d\n",
 107                                 __func__, -err);
 108                 break;
 109         }
 110         return -EIO;
 111 }
 112
 113 /*
 114  * This is our standard bitmap for GETATTR requests.
 115  */
 116 const u32 nfs4_fattr_bitmap[2] = {
 117         FATTR4_WORD0_TYPE
 118         | FATTR4_WORD0_CHANGE
 119         | FATTR4_WORD0_SIZE
 120         | FATTR4_WORD0_FSID
 121         | FATTR4_WORD0_FILEID,
 122         FATTR4_WORD1_MODE
 123         | FATTR4_WORD1_NUMLINKS
 124         | FATTR4_WORD1_OWNER
 125         | FATTR4_WORD1_OWNER_GROUP
 126         | FATTR4_WORD1_RAWDEV
 127         | FATTR4_WORD1_SPACE_USED
 128         | FATTR4_WORD1_TIME_ACCESS
 129         | FATTR4_WORD1_TIME_METADATA
 130         | FATTR4_WORD1_TIME_MODIFY
 131 };
 132
 133 const u32 nfs4_statfs_bitmap[2] = {
 134         FATTR4_WORD0_FILES_AVAIL
 135         | FATTR4_WORD0_FILES_FREE
 136         | FATTR4_WORD0_FILES_TOTAL,
 137         FATTR4_WORD1_SPACE_AVAIL
 138         | FATTR4_WORD1_SPACE_FREE
 139         | FATTR4_WORD1_SPACE_TOTAL
 140 };
 141
 142 const u32 nfs4_pathconf_bitmap[2] = {
 143         FATTR4_WORD0_MAXLINK
 144         | FATTR4_WORD0_MAXNAME,
 145         0
 146 };
 147
 148 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 149                         | FATTR4_WORD0_MAXREAD
 150                         | FATTR4_WORD0_MAXWRITE
 151                         | FATTR4_WORD0_LEASE_TIME,
 152                         FATTR4_WORD1_TIME_DELTA
 153                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 154                         FATTR4_WORD2_LAYOUT_BLKSIZE
 155 };
 156
 157 const u32 nfs4_fs_locations_bitmap[2] = {
 158         FATTR4_WORD0_TYPE
 159         | FATTR4_WORD0_CHANGE
 160         | FATTR4_WORD0_SIZE
 161         | FATTR4_WORD0_FSID
 162         | FATTR4_WORD0_FILEID
 163         | FATTR4_WORD0_FS_LOCATIONS,
 164         FATTR4_WORD1_MODE
 165         | FATTR4_WORD1_NUMLINKS
 166         | FATTR4_WORD1_OWNER
 167         | FATTR4_WORD1_OWNER_GROUP
 168         | FATTR4_WORD1_RAWDEV
 169         | FATTR4_WORD1_SPACE_USED
 170         | FATTR4_WORD1_TIME_ACCESS
 171         | FATTR4_WORD1_TIME_METADATA
 172         | FATTR4_WORD1_TIME_MODIFY
 173         | FATTR4_WORD1_MOUNTED_ON_FILEID
 174 };
 175
 176 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 177                 struct nfs4_readdir_arg *readdir)
 178 {
 179         __be32 *start, *p;
 180
 181         BUG_ON(readdir->count < 80);
 182         if (cookie > 2) {
 183                 readdir->cookie = cookie;
 184                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 185                 return;
 186         }
 187
 188         readdir->cookie = 0;
 189         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 190         if (cookie == 2)
 191                 return;
 192
 193         /*
 194          * NFSv4 servers do not return entries for '.' and '..'
 195          * Therefore, we fake these entries here.  We let '.'
 196          * have cookie 0 and '..' have cookie 1.  Note that
 197          * when talking to the server, we always send cookie 0
 198          * instead of 1 or 2.
 199          */
 200         start = p = kmap_atomic(*readdir->pages);
 201
 202         if (cookie == 0) {
 203                 *p++ = xdr_one;                                  /* next */
 204                 *p++ = xdr_zero;                   /* cookie, first word */
 205                 *p++ = xdr_one;                   /* cookie, second word */
 206                 *p++ = xdr_one;                             /* entry len */
 207                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 208                 p++;
 209                 *p++ = xdr_one;                         /* bitmap length */
 210                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 211                 *p++ = htonl(8);              /* attribute buffer length */
 212                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 213         }
 214
 215         *p++ = xdr_one;                                  /* next */
 216         *p++ = xdr_zero;                   /* cookie, first word */
 217         *p++ = xdr_two;                   /* cookie, second word */
 218         *p++ = xdr_two;                             /* entry len */
 219         memcpy(p, "..\0\0", 4);                         /* entry */
 220         p++;
 221         *p++ = xdr_one;                         /* bitmap length */
 222         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 223         *p++ = htonl(8);              /* attribute buffer length */
 224         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 225
 226         readdir->pgbase = (char *)p - (char *)start;
 227         readdir->count -= readdir->pgbase;
 228         kunmap_atomic(start);
 229 }
 230
 231 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 232 {
 233         int res;
 234
 235         might_sleep();
 236
 237         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 238                         nfs_wait_bit_killable, TASK_KILLABLE);
 239         return res;
 240 }
 241
 242 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 243 {
 244         int res = 0;
 245
 246         might_sleep();
 247
 248         if (*timeout <= 0)
 249                 *timeout = NFS4_POLL_RETRY_MIN;
 250         if (*timeout > NFS4_POLL_RETRY_MAX)
 251                 *timeout = NFS4_POLL_RETRY_MAX;
 252         freezable_schedule_timeout_killable(*timeout);
 253         if (fatal_signal_pending(current))
 254                 res = -ERESTARTSYS;
 255         *timeout <<= 1;
 256         return res;
 257 }
 258
 259 /* This is the error handling routine for processes that are allowed
 260  * to sleep.
 261  */
 262 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 263 {
 264         struct nfs_client *clp = server->nfs_client;
 265         struct nfs4_state *state = exception->state;
 266         struct inode *inode = exception->inode;
 267         int ret = errorcode;
 268
 269         exception->retry = 0;
 270         switch(errorcode) {
 271                 case 0:
 272                         return 0;
 273                 case -NFS4ERR_OPENMODE:
 274                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 275                                 nfs_inode_return_delegation(inode);
 276                                 exception->retry = 1;
 277                                 return 0;
 278                         }
 279                         if (state == NULL)
 280                                 break;
 281                         nfs4_schedule_stateid_recovery(server, state);
 282                         goto wait_on_recovery;
 283                 case -NFS4ERR_DELEG_REVOKED:
 284                 case -NFS4ERR_ADMIN_REVOKED:
 285                 case -NFS4ERR_BAD_STATEID:
 286                         if (state == NULL)
 287                                 break;
 288                         nfs_remove_bad_delegation(state->inode);
 289                         nfs4_schedule_stateid_recovery(server, state);
 290                         goto wait_on_recovery;
 291                 case -NFS4ERR_EXPIRED:
 292                         if (state != NULL)
 293                                 nfs4_schedule_stateid_recovery(server, state);
 294                 case -NFS4ERR_STALE_STATEID:
 295                 case -NFS4ERR_STALE_CLIENTID:
 296                         nfs4_schedule_lease_recovery(clp);
 297                         goto wait_on_recovery;
 298 #if defined(CONFIG_NFS_V4_1)
 299                 case -NFS4ERR_BADSESSION:
 300                 case -NFS4ERR_BADSLOT:
 301                 case -NFS4ERR_BAD_HIGH_SLOT:
 302                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 303                 case -NFS4ERR_DEADSESSION:
 304                 case -NFS4ERR_SEQ_FALSE_RETRY:
 305                 case -NFS4ERR_SEQ_MISORDERED:
 306                         dprintk("%s ERROR: %d Reset session\n", __func__,
 307                                 errorcode);
 308                         nfs4_schedule_session_recovery(clp->cl_session);
 309                         exception->retry = 1;
 310                         break;
 311 #endif /* defined(CONFIG_NFS_V4_1) */
 312                 case -NFS4ERR_FILE_OPEN:
 313                         if (exception->timeout > HZ) {
 314                                 /* We have retried a decent amount, time to
 315                                  * fail
 316                                  */
 317                                 ret = -EBUSY;
 318                                 break;
 319                         }
 320                 case -NFS4ERR_GRACE:
 321                 case -NFS4ERR_DELAY:
 322                 case -EKEYEXPIRED:
 323                         ret = nfs4_delay(server->client, &exception->timeout);
 324                         if (ret != 0)
 325                                 break;
 326                 case -NFS4ERR_RETRY_UNCACHED_REP:
 327                 case -NFS4ERR_OLD_STATEID:
 328                         exception->retry = 1;
 329                         break;
 330                 case -NFS4ERR_BADOWNER:
 331                         /* The following works around a Linux server bug! */
 332                 case -NFS4ERR_BADNAME:
 333                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 334                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 335                                 exception->retry = 1;
 336                                 printk(KERN_WARNING "NFS: v4 server %s "
 337                                                 "does not accept raw "
 338                                                 "uid/gids. "
 339                                                 "Reenabling the idmapper.\n",
 340                                                 server->nfs_client->cl_hostname);
 341                         }
 342         }
 343         /* We failed to handle the error */
 344         return nfs4_map_errors(ret);
 345 wait_on_recovery:
 346         ret = nfs4_wait_clnt_recover(clp);
 347         if (ret == 0)
 348                 exception->retry = 1;
 349         return ret;
 350 }
 351
 352
 353 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 354 {
 355         spin_lock(&clp->cl_lock);
 356         if (time_before(clp->cl_last_renewal,timestamp))
 357                 clp->cl_last_renewal = timestamp;
 358         spin_unlock(&clp->cl_lock);
 359 }
 360
 361 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 362 {
 363         do_renew_lease(server->nfs_client, timestamp);
 364 }
 365
 366 #if defined(CONFIG_NFS_V4_1)
 367
 368 /*
 369  * nfs4_free_slot - free a slot and efficiently update slot table.
 370  *
 371  * freeing a slot is trivially done by clearing its respective bit
 372  * in the bitmap.
 373  * If the freed slotid equals highest_used_slotid we want to update it
 374  * so that the server would be able to size down the slot table if needed,
 375  * otherwise we know that the highest_used_slotid is still in use.
 376  * When updating highest_used_slotid there may be "holes" in the bitmap
 377  * so we need to scan down from highest_used_slotid to 0 looking for the now
 378  * highest slotid in use.
 379  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 380  *
 381  * Must be called while holding tbl->slot_tbl_lock
 382  */
 383 static void
 384 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 385 {
 386         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 387         /* clear used bit in bitmap */
 388         __clear_bit(slotid, tbl->used_slots);
 389
 390         /* update highest_used_slotid when it is freed */
 391         if (slotid == tbl->highest_used_slotid) {
 392                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 393                 if (slotid < tbl->max_slots)
 394                         tbl->highest_used_slotid = slotid;
 395                 else
 396                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 397         }
 398         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 399                 slotid, tbl->highest_used_slotid);
 400 }
 401
 402 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 403 {
 404         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 405         return true;
 406 }
 407
 408 /*
 409  * Signal state manager thread if session fore channel is drained
 410  */
 411 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 412 {
 413         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 414                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 415                                 nfs4_set_task_privileged, NULL);
 416                 return;
 417         }
 418
 419         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 420                 return;
 421
 422         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 423         complete(&ses->fc_slot_table.complete);
 424 }
 425
 426 /*
 427  * Signal state manager thread if session back channel is drained
 428  */
 429 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 430 {
 431         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 432             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 433                 return;
 434         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 435         complete(&ses->bc_slot_table.complete);
 436 }
 437
 438 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 439 {
 440         struct nfs4_slot_table *tbl;
 441
 442         tbl = &res->sr_session->fc_slot_table;
 443         if (!res->sr_slot) {
 444                 /* just wake up the next guy waiting since
 445                  * we may have not consumed a slot after all */
 446                 dprintk("%s: No slot\n", __func__);
 447                 return;
 448         }
 449
 450         spin_lock(&tbl->slot_tbl_lock);
 451         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 452         nfs4_check_drain_fc_complete(res->sr_session);
 453         spin_unlock(&tbl->slot_tbl_lock);
 454         res->sr_slot = NULL;
 455 }
 456
 457 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 458 {
 459         unsigned long timestamp;
 460         struct nfs_client *clp;
 461
 462         /*
 463          * sr_status remains 1 if an RPC level error occurred. The server
 464          * may or may not have processed the sequence operation..
 465          * Proceed as if the server received and processed the sequence
 466          * operation.
 467          */
 468         if (res->sr_status == 1)
 469                 res->sr_status = NFS_OK;
 470
 471         /* don't increment the sequence number if the task wasn't sent */
 472         if (!RPC_WAS_SENT(task))
 473                 goto out;
 474
 475         /* Check the SEQUENCE operation status */
 476         switch (res->sr_status) {
 477         case 0:
 478                 /* Update the slot's sequence and clientid lease timer */
 479                 ++res->sr_slot->seq_nr;
 480                 timestamp = res->sr_renewal_time;
 481                 clp = res->sr_session->clp;
 482                 do_renew_lease(clp, timestamp);
 483                 /* Check sequence flags */
 484                 if (res->sr_status_flags != 0)
 485                         nfs4_schedule_lease_recovery(clp);
 486                 break;
 487         case -NFS4ERR_DELAY:
 488                 /* The server detected a resend of the RPC call and
 489                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 490                  * of RFC5661.
 491                  */
 492                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 493                         __func__,
 494                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 495                         res->sr_slot->seq_nr);
 496                 goto out_retry;
 497         default:
 498                 /* Just update the slot sequence no. */
 499                 ++res->sr_slot->seq_nr;
 500         }
 501 out:
 502         /* The session may be reset by one of the error handlers. */
 503         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 504         nfs41_sequence_free_slot(res);
 505         return 1;
 506 out_retry:
 507         if (!rpc_restart_call(task))
 508                 goto out;
 509         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 510         return 0;
 511 }
 512
 513 static int nfs4_sequence_done(struct rpc_task *task,
 514                                struct nfs4_sequence_res *res)
 515 {
 516         if (res->sr_session == NULL)
 517                 return 1;
 518         return nfs41_sequence_done(task, res);
 519 }
 520
 521 /*
 522  * nfs4_find_slot - efficiently look for a free slot
 523  *
 524  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 525  * If found, we mark the slot as used, update the highest_used_slotid,
 526  * and respectively set up the sequence operation args.
 527  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 528  *
 529  * Note: must be called with under the slot_tbl_lock.
 530  */
 531 static u32
 532 nfs4_find_slot(struct nfs4_slot_table *tbl)
 533 {
 534         u32 slotid;
 535         u32 ret_id = NFS4_NO_SLOT;
 536
 537         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 538                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 539                 tbl->max_slots);
 540         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 541         if (slotid >= tbl->max_slots)
 542                 goto out;
 543         __set_bit(slotid, tbl->used_slots);
 544         if (slotid > tbl->highest_used_slotid ||
 545                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 546                 tbl->highest_used_slotid = slotid;
 547         ret_id = slotid;
 548 out:
 549         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 550                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 551         return ret_id;
 552 }
 553
 554 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 555                 struct nfs4_sequence_res *res, int cache_reply)
 556 {
 557         args->sa_session = NULL;
 558         args->sa_cache_this = 0;
 559         if (cache_reply)
 560                 args->sa_cache_this = 1;
 561         res->sr_session = NULL;
 562         res->sr_slot = NULL;
 563 }
 564
 565 int nfs41_setup_sequence(struct nfs4_session *session,
 566                                 struct nfs4_sequence_args *args,
 567                                 struct nfs4_sequence_res *res,
 568                                 struct rpc_task *task)
 569 {
 570         struct nfs4_slot *slot;
 571         struct nfs4_slot_table *tbl;
 572         u32 slotid;
 573
 574         dprintk("--> %s\n", __func__);
 575         /* slot already allocated? */
 576         if (res->sr_slot != NULL)
 577                 return 0;
 578
 579         tbl = &session->fc_slot_table;
 580
 581         spin_lock(&tbl->slot_tbl_lock);
 582         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 583             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 584                 /* The state manager will wait until the slot table is empty */
 585                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 586                 spin_unlock(&tbl->slot_tbl_lock);
 587                 dprintk("%s session is draining\n", __func__);
 588                 return -EAGAIN;
 589         }
 590
 591         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 592             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 593                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 594                 spin_unlock(&tbl->slot_tbl_lock);
 595                 dprintk("%s enforce FIFO order\n", __func__);
 596                 return -EAGAIN;
 597         }
 598
 599         slotid = nfs4_find_slot(tbl);
 600         if (slotid == NFS4_NO_SLOT) {
 601                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 602                 spin_unlock(&tbl->slot_tbl_lock);
 603                 dprintk("<-- %s: no free slots\n", __func__);
 604                 return -EAGAIN;
 605         }
 606         spin_unlock(&tbl->slot_tbl_lock);
 607
 608         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 609         slot = tbl->slots + slotid;
 610         args->sa_session = session;
 611         args->sa_slotid = slotid;
 612
 613         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 614
 615         res->sr_session = session;
 616         res->sr_slot = slot;
 617         res->sr_renewal_time = jiffies;
 618         res->sr_status_flags = 0;
 619         /*
 620          * sr_status is only set in decode_sequence, and so will remain
 621          * set to 1 if an rpc level failure occurs.
 622          */
 623         res->sr_status = 1;
 624         return 0;
 625 }
 626 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 627
 628 int nfs4_setup_sequence(const struct nfs_server *server,
 629                         struct nfs4_sequence_args *args,
 630                         struct nfs4_sequence_res *res,
 631                         struct rpc_task *task)
 632 {
 633         struct nfs4_session *session = nfs4_get_session(server);
 634         int ret = 0;
 635
 636         if (session == NULL)
 637                 goto out;
 638
 639         dprintk("--> %s clp %p session %p sr_slot %td\n",
 640                 __func__, session->clp, session, res->sr_slot ?
 641                         res->sr_slot - session->fc_slot_table.slots : -1);
 642
 643         ret = nfs41_setup_sequence(session, args, res, task);
 644 out:
 645         dprintk("<-- %s status=%d\n", __func__, ret);
 646         return ret;
 647 }
 648
 649 struct nfs41_call_sync_data {
 650         const struct nfs_server *seq_server;
 651         struct nfs4_sequence_args *seq_args;
 652         struct nfs4_sequence_res *seq_res;
 653 };
 654
 655 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 656 {
 657         struct nfs41_call_sync_data *data = calldata;
 658
 659         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 660
 661         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 662                                 data->seq_res, task))
 663                 return;
 664         rpc_call_start(task);
 665 }
 666
 667 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 668 {
 669         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 670         nfs41_call_sync_prepare(task, calldata);
 671 }
 672
 673 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 674 {
 675         struct nfs41_call_sync_data *data = calldata;
 676
 677         nfs41_sequence_done(task, data->seq_res);
 678 }
 679
 680 static const struct rpc_call_ops nfs41_call_sync_ops = {
 681         .rpc_call_prepare = nfs41_call_sync_prepare,
 682         .rpc_call_done = nfs41_call_sync_done,
 683 };
 684
 685 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 686         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 687         .rpc_call_done = nfs41_call_sync_done,
 688 };
 689
 690 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 691                                    struct nfs_server *server,
 692                                    struct rpc_message *msg,
 693                                    struct nfs4_sequence_args *args,
 694                                    struct nfs4_sequence_res *res,
 695                                    int privileged)
 696 {
 697         int ret;
 698         struct rpc_task *task;
 699         struct nfs41_call_sync_data data = {
 700                 .seq_server = server,
 701                 .seq_args = args,
 702                 .seq_res = res,
 703         };
 704         struct rpc_task_setup task_setup = {
 705                 .rpc_client = clnt,
 706                 .rpc_message = msg,
 707                 .callback_ops = &nfs41_call_sync_ops,
 708                 .callback_data = &data
 709         };
 710
 711         if (privileged)
 712                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 713         task = rpc_run_task(&task_setup);
 714         if (IS_ERR(task))
 715                 ret = PTR_ERR(task);
 716         else {
 717                 ret = task->tk_status;
 718                 rpc_put_task(task);
 719         }
 720         return ret;
 721 }
 722
 723 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 724                             struct nfs_server *server,
 725                             struct rpc_message *msg,
 726                             struct nfs4_sequence_args *args,
 727                             struct nfs4_sequence_res *res,
 728                             int cache_reply)
 729 {
 730         nfs41_init_sequence(args, res, cache_reply);
 731         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 732 }
 733
 734 #else
 735 static inline
 736 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 737                 struct nfs4_sequence_res *res, int cache_reply)
 738 {
 739 }
 740
 741 static int nfs4_sequence_done(struct rpc_task *task,
 742                                struct nfs4_sequence_res *res)
 743 {
 744         return 1;
 745 }
 746 #endif /* CONFIG_NFS_V4_1 */
 747
 748 int _nfs4_call_sync(struct rpc_clnt *clnt,
 749                     struct nfs_server *server,
 750                     struct rpc_message *msg,
 751                     struct nfs4_sequence_args *args,
 752                     struct nfs4_sequence_res *res,
 753                     int cache_reply)
 754 {
 755         nfs41_init_sequence(args, res, cache_reply);
 756         return rpc_call_sync(clnt, msg, 0);
 757 }
 758
 759 static inline
 760 int nfs4_call_sync(struct rpc_clnt *clnt,
 761                    struct nfs_server *server,
 762                    struct rpc_message *msg,
 763                    struct nfs4_sequence_args *args,
 764                    struct nfs4_sequence_res *res,
 765                    int cache_reply)
 766 {
 767         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 768                                                 args, res, cache_reply);
 769 }
 770
 771 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 772 {
 773         struct nfs_inode *nfsi = NFS_I(dir);
 774
 775         spin_lock(&dir->i_lock);
 776         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 777         if (!cinfo->atomic || cinfo->before != dir->i_version)
 778                 nfs_force_lookup_revalidate(dir);
 779         dir->i_version = cinfo->after;
 780         spin_unlock(&dir->i_lock);
 781 }
 782
 783 struct nfs4_opendata {
 784         struct kref kref;
 785         struct nfs_openargs o_arg;
 786         struct nfs_openres o_res;
 787         struct nfs_open_confirmargs c_arg;
 788         struct nfs_open_confirmres c_res;
 789         struct nfs4_string owner_name;
 790         struct nfs4_string group_name;
 791         struct nfs_fattr f_attr;
 792         struct dentry *dir;
 793         struct dentry *dentry;
 794         struct nfs4_state_owner *owner;
 795         struct nfs4_state *state;
 796         struct iattr attrs;
 797         unsigned long timestamp;
 798         unsigned int rpc_done : 1;
 799         int rpc_status;
 800         int cancelled;
 801 };
 802
 803
 804 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 805 {
 806         p->o_res.f_attr = &p->f_attr;
 807         p->o_res.seqid = p->o_arg.seqid;
 808         p->c_res.seqid = p->c_arg.seqid;
 809         p->o_res.server = p->o_arg.server;
 810         nfs_fattr_init(&p->f_attr);
 811         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 812 }
 813
 814 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 815                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 816                 const struct iattr *attrs,
 817                 gfp_t gfp_mask)
 818 {
 819         struct dentry *parent = dget_parent(dentry);
 820         struct inode *dir = parent->d_inode;
 821         struct nfs_server *server = NFS_SERVER(dir);
 822         struct nfs4_opendata *p;
 823
 824         p = kzalloc(sizeof(*p), gfp_mask);
 825         if (p == NULL)
 826                 goto err;
 827         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 828         if (p->o_arg.seqid == NULL)
 829                 goto err_free;
 830         nfs_sb_active(dentry->d_sb);
 831         p->dentry = dget(dentry);
 832         p->dir = parent;
 833         p->owner = sp;
 834         atomic_inc(&sp->so_count);
 835         p->o_arg.fh = NFS_FH(dir);
 836         p->o_arg.open_flags = flags;
 837         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 838         p->o_arg.clientid = server->nfs_client->cl_clientid;
 839         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 840         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 841         p->o_arg.name = &dentry->d_name;
 842         p->o_arg.server = server;
 843         p->o_arg.bitmask = server->attr_bitmask;
 844         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 845         if (attrs != NULL && attrs->ia_valid != 0) {
 846                 __be32 verf[2];
 847
 848                 p->o_arg.u.attrs = &p->attrs;
 849                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 850
 851                 verf[0] = jiffies;
 852                 verf[1] = current->pid;
 853                 memcpy(p->o_arg.u.verifier.data, verf,
 854                                 sizeof(p->o_arg.u.verifier.data));
 855         }
 856         p->c_arg.fh = &p->o_res.fh;
 857         p->c_arg.stateid = &p->o_res.stateid;
 858         p->c_arg.seqid = p->o_arg.seqid;
 859         nfs4_init_opendata_res(p);
 860         kref_init(&p->kref);
 861         return p;
 862 err_free:
 863         kfree(p);
 864 err:
 865         dput(parent);
 866         return NULL;
 867 }
 868
 869 static void nfs4_opendata_free(struct kref *kref)
 870 {
 871         struct nfs4_opendata *p = container_of(kref,
 872                         struct nfs4_opendata, kref);
 873         struct super_block *sb = p->dentry->d_sb;
 874
 875         nfs_free_seqid(p->o_arg.seqid);
 876         if (p->state != NULL)
 877                 nfs4_put_open_state(p->state);
 878         nfs4_put_state_owner(p->owner);
 879         dput(p->dir);
 880         dput(p->dentry);
 881         nfs_sb_deactive(sb);
 882         nfs_fattr_free_names(&p->f_attr);
 883         kfree(p);
 884 }
 885
 886 static void nfs4_opendata_put(struct nfs4_opendata *p)
 887 {
 888         if (p != NULL)
 889                 kref_put(&p->kref, nfs4_opendata_free);
 890 }
 891
 892 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 893 {
 894         int ret;
 895
 896         ret = rpc_wait_for_completion_task(task);
 897         return ret;
 898 }
 899
 900 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 901 {
 902         int ret = 0;
 903
 904         if (open_mode & (O_EXCL|O_TRUNC))
 905                 goto out;
 906         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 907                 case FMODE_READ:
 908                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 909                                 && state->n_rdonly != 0;
 910                         break;
 911                 case FMODE_WRITE:
 912                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 913                                 && state->n_wronly != 0;
 914                         break;
 915                 case FMODE_READ|FMODE_WRITE:
 916                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 917                                 && state->n_rdwr != 0;
 918         }
 919 out:
 920         return ret;
 921 }
 922
 923 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 924 {
 925         if (delegation == NULL)
 926                 return 0;
 927         if ((delegation->type & fmode) != fmode)
 928                 return 0;
 929         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 930                 return 0;
 931         nfs_mark_delegation_referenced(delegation);
 932         return 1;
 933 }
 934
 935 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 936 {
 937         switch (fmode) {
 938                 case FMODE_WRITE:
 939                         state->n_wronly++;
 940                         break;
 941                 case FMODE_READ:
 942                         state->n_rdonly++;
 943                         break;
 944                 case FMODE_READ|FMODE_WRITE:
 945                         state->n_rdwr++;
 946         }
 947         nfs4_state_set_mode_locked(state, state->state | fmode);
 948 }
 949
 950 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 951 {
 952         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 953                 nfs4_stateid_copy(&state->stateid, stateid);
 954         nfs4_stateid_copy(&state->open_stateid, stateid);
 955         switch (fmode) {
 956                 case FMODE_READ:
 957                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 958                         break;
 959                 case FMODE_WRITE:
 960                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 961                         break;
 962                 case FMODE_READ|FMODE_WRITE:
 963                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 964         }
 965 }
 966
 967 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 968 {
 969         write_seqlock(&state->seqlock);
 970         nfs_set_open_stateid_locked(state, stateid, fmode);
 971         write_sequnlock(&state->seqlock);
 972 }
 973
 974 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 975 {
 976         /*
 977          * Protect the call to nfs4_state_set_mode_locked and
 978          * serialise the stateid update
 979          */
 980         write_seqlock(&state->seqlock);
 981         if (deleg_stateid != NULL) {
 982                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 983                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 984         }
 985         if (open_stateid != NULL)
 986                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 987         write_sequnlock(&state->seqlock);
 988         spin_lock(&state->owner->so_lock);
 989         update_open_stateflags(state, fmode);
 990         spin_unlock(&state->owner->so_lock);
 991 }
 992
 993 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 994 {
 995         struct nfs_inode *nfsi = NFS_I(state->inode);
 996         struct nfs_delegation *deleg_cur;
 997         int ret = 0;
 998
 999         fmode &= (FMODE_READ|FMODE_WRITE);
1000
1001         rcu_read_lock();
1002         deleg_cur = rcu_dereference(nfsi->delegation);
1003         if (deleg_cur == NULL)
1004                 goto no_delegation;
1005
1006         spin_lock(&deleg_cur->lock);
1007         if (nfsi->delegation != deleg_cur ||
1008             (deleg_cur->type & fmode) != fmode)
1009                 goto no_delegation_unlock;
1010
1011         if (delegation == NULL)
1012                 delegation = &deleg_cur->stateid;
1013         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1014                 goto no_delegation_unlock;
1015
1016         nfs_mark_delegation_referenced(deleg_cur);
1017         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1018         ret = 1;
1019 no_delegation_unlock:
1020         spin_unlock(&deleg_cur->lock);
1021 no_delegation:
1022         rcu_read_unlock();
1023
1024         if (!ret && open_stateid != NULL) {
1025                 __update_open_stateid(state, open_stateid, NULL, fmode);
1026                 ret = 1;
1027         }
1028
1029         return ret;
1030 }
1031
1032
1033 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1034 {
1035         struct nfs_delegation *delegation;
1036
1037         rcu_read_lock();
1038         delegation = rcu_dereference(NFS_I(inode)->delegation);
1039         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1040                 rcu_read_unlock();
1041                 return;
1042         }
1043         rcu_read_unlock();
1044         nfs_inode_return_delegation(inode);
1045 }
1046
1047 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1048 {
1049         struct nfs4_state *state = opendata->state;
1050         struct nfs_inode *nfsi = NFS_I(state->inode);
1051         struct nfs_delegation *delegation;
1052         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1053         fmode_t fmode = opendata->o_arg.fmode;
1054         nfs4_stateid stateid;
1055         int ret = -EAGAIN;
1056
1057         for (;;) {
1058                 if (can_open_cached(state, fmode, open_mode)) {
1059                         spin_lock(&state->owner->so_lock);
1060                         if (can_open_cached(state, fmode, open_mode)) {
1061                                 update_open_stateflags(state, fmode);
1062                                 spin_unlock(&state->owner->so_lock);
1063                                 goto out_return_state;
1064                         }
1065                         spin_unlock(&state->owner->so_lock);
1066                 }
1067                 rcu_read_lock();
1068                 delegation = rcu_dereference(nfsi->delegation);
1069                 if (!can_open_delegated(delegation, fmode)) {
1070                         rcu_read_unlock();
1071                         break;
1072                 }
1073                 /* Save the delegation */
1074                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1075                 rcu_read_unlock();
1076                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1077                 if (ret != 0)
1078                         goto out;
1079                 ret = -EAGAIN;
1080
1081                 /* Try to update the stateid using the delegation */
1082                 if (update_open_stateid(state, NULL, &stateid, fmode))
1083                         goto out_return_state;
1084         }
1085 out:
1086         return ERR_PTR(ret);
1087 out_return_state:
1088         atomic_inc(&state->count);
1089         return state;
1090 }
1091
1092 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1093 {
1094         struct inode *inode;
1095         struct nfs4_state *state = NULL;
1096         struct nfs_delegation *delegation;
1097         int ret;
1098
1099         if (!data->rpc_done) {
1100                 state = nfs4_try_open_cached(data);
1101                 goto out;
1102         }
1103
1104         ret = -EAGAIN;
1105         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1106                 goto err;
1107         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1108         ret = PTR_ERR(inode);
1109         if (IS_ERR(inode))
1110                 goto err;
1111         ret = -ENOMEM;
1112         state = nfs4_get_open_state(inode, data->owner);
1113         if (state == NULL)
1114                 goto err_put_inode;
1115         if (data->o_res.delegation_type != 0) {
1116                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1117                 int delegation_flags = 0;
1118
1119                 rcu_read_lock();
1120                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1121                 if (delegation)
1122                         delegation_flags = delegation->flags;
1123                 rcu_read_unlock();
1124                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1125                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1126                                         "returning a delegation for "
1127                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1128                                         clp->cl_hostname);
1129                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1130                         nfs_inode_set_delegation(state->inode,
1131                                         data->owner->so_cred,
1132                                         &data->o_res);
1133                 else
1134                         nfs_inode_reclaim_delegation(state->inode,
1135                                         data->owner->so_cred,
1136                                         &data->o_res);
1137         }
1138
1139         update_open_stateid(state, &data->o_res.stateid, NULL,
1140                         data->o_arg.fmode);
1141         iput(inode);
1142 out:
1143         return state;
1144 err_put_inode:
1145         iput(inode);
1146 err:
1147         return ERR_PTR(ret);
1148 }
1149
1150 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1151 {
1152         struct nfs_inode *nfsi = NFS_I(state->inode);
1153         struct nfs_open_context *ctx;
1154
1155         spin_lock(&state->inode->i_lock);
1156         list_for_each_entry(ctx, &nfsi->open_files, list) {
1157                 if (ctx->state != state)
1158                         continue;
1159                 get_nfs_open_context(ctx);
1160                 spin_unlock(&state->inode->i_lock);
1161                 return ctx;
1162         }
1163         spin_unlock(&state->inode->i_lock);
1164         return ERR_PTR(-ENOENT);
1165 }
1166
1167 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1168 {
1169         struct nfs4_opendata *opendata;
1170
1171         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1172         if (opendata == NULL)
1173                 return ERR_PTR(-ENOMEM);
1174         opendata->state = state;
1175         atomic_inc(&state->count);
1176         return opendata;
1177 }
1178
1179 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1180 {
1181         struct nfs4_state *newstate;
1182         int ret;
1183
1184         opendata->o_arg.open_flags = 0;
1185         opendata->o_arg.fmode = fmode;
1186         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1187         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1188         nfs4_init_opendata_res(opendata);
1189         ret = _nfs4_recover_proc_open(opendata);
1190         if (ret != 0)
1191                 return ret;
1192         newstate = nfs4_opendata_to_nfs4_state(opendata);
1193         if (IS_ERR(newstate))
1194                 return PTR_ERR(newstate);
1195         nfs4_close_state(newstate, fmode);
1196         *res = newstate;
1197         return 0;
1198 }
1199
1200 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1201 {
1202         struct nfs4_state *newstate;
1203         int ret;
1204
1205         /* memory barrier prior to reading state->n_* */
1206         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1207         smp_rmb();
1208         if (state->n_rdwr != 0) {
1209                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1210                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1211                 if (ret != 0)
1212                         return ret;
1213                 if (newstate != state)
1214                         return -ESTALE;
1215         }
1216         if (state->n_wronly != 0) {
1217                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1218                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1219                 if (ret != 0)
1220                         return ret;
1221                 if (newstate != state)
1222                         return -ESTALE;
1223         }
1224         if (state->n_rdonly != 0) {
1225                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1226                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1227                 if (ret != 0)
1228                         return ret;
1229                 if (newstate != state)
1230                         return -ESTALE;
1231         }
1232         /*
1233          * We may have performed cached opens for all three recoveries.
1234          * Check if we need to update the current stateid.
1235          */
1236         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1237             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1238                 write_seqlock(&state->seqlock);
1239                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1240                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1241                 write_sequnlock(&state->seqlock);
1242         }
1243         return 0;
1244 }
1245
1246 /*
1247  * OPEN_RECLAIM:
1248  *      reclaim state on the server after a reboot.
1249  */
1250 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1251 {
1252         struct nfs_delegation *delegation;
1253         struct nfs4_opendata *opendata;
1254         fmode_t delegation_type = 0;
1255         int status;
1256
1257         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1258         if (IS_ERR(opendata))
1259                 return PTR_ERR(opendata);
1260         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1261         opendata->o_arg.fh = NFS_FH(state->inode);
1262         rcu_read_lock();
1263         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1264         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1265                 delegation_type = delegation->type;
1266         rcu_read_unlock();
1267         opendata->o_arg.u.delegation_type = delegation_type;
1268         status = nfs4_open_recover(opendata, state);
1269         nfs4_opendata_put(opendata);
1270         return status;
1271 }
1272
1273 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1274 {
1275         struct nfs_server *server = NFS_SERVER(state->inode);
1276         struct nfs4_exception exception = { };
1277         int err;
1278         do {
1279                 err = _nfs4_do_open_reclaim(ctx, state);
1280                 if (err != -NFS4ERR_DELAY)
1281                         break;
1282                 nfs4_handle_exception(server, err, &exception);
1283         } while (exception.retry);
1284         return err;
1285 }
1286
1287 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1288 {
1289         struct nfs_open_context *ctx;
1290         int ret;
1291
1292         ctx = nfs4_state_find_open_context(state);
1293         if (IS_ERR(ctx))
1294                 return PTR_ERR(ctx);
1295         ret = nfs4_do_open_reclaim(ctx, state);
1296         put_nfs_open_context(ctx);
1297         return ret;
1298 }
1299
1300 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1301 {
1302         struct nfs4_opendata *opendata;
1303         int ret;
1304
1305         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1306         if (IS_ERR(opendata))
1307                 return PTR_ERR(opendata);
1308         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1309         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1310         ret = nfs4_open_recover(opendata, state);
1311         nfs4_opendata_put(opendata);
1312         return ret;
1313 }
1314
1315 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1316 {
1317         struct nfs4_exception exception = { };
1318         struct nfs_server *server = NFS_SERVER(state->inode);
1319         int err;
1320         do {
1321                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1322                 switch (err) {
1323                         case 0:
1324                         case -ENOENT:
1325                         case -ESTALE:
1326                                 goto out;
1327                         case -NFS4ERR_BADSESSION:
1328                         case -NFS4ERR_BADSLOT:
1329                         case -NFS4ERR_BAD_HIGH_SLOT:
1330                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1331                         case -NFS4ERR_DEADSESSION:
1332                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1333                                 goto out;
1334                         case -NFS4ERR_STALE_CLIENTID:
1335                         case -NFS4ERR_STALE_STATEID:
1336                         case -NFS4ERR_EXPIRED:
1337                                 /* Don't recall a delegation if it was lost */
1338                                 nfs4_schedule_lease_recovery(server->nfs_client);
1339                                 goto out;
1340                         case -ERESTARTSYS:
1341                                 /*
1342                                  * The show must go on: exit, but mark the
1343                                  * stateid as needing recovery.
1344                                  */
1345                         case -NFS4ERR_DELEG_REVOKED:
1346                         case -NFS4ERR_ADMIN_REVOKED:
1347                         case -NFS4ERR_BAD_STATEID:
1348                                 nfs_inode_find_state_and_recover(state->inode,
1349                                                 stateid);
1350                                 nfs4_schedule_stateid_recovery(server, state);
1351                         case -EKEYEXPIRED:
1352                                 /*
1353                                  * User RPCSEC_GSS context has expired.
1354                                  * We cannot recover this stateid now, so
1355                                  * skip it and allow recovery thread to
1356                                  * proceed.
1357                                  */
1358                         case -ENOMEM:
1359                                 err = 0;
1360                                 goto out;
1361                 }
1362                 err = nfs4_handle_exception(server, err, &exception);
1363         } while (exception.retry);
1364 out:
1365         return err;
1366 }
1367
1368 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1369 {
1370         struct nfs4_opendata *data = calldata;
1371
1372         data->rpc_status = task->tk_status;
1373         if (data->rpc_status == 0) {
1374                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1375                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1376                 renew_lease(data->o_res.server, data->timestamp);
1377                 data->rpc_done = 1;
1378         }
1379 }
1380
1381 static void nfs4_open_confirm_release(void *calldata)
1382 {
1383         struct nfs4_opendata *data = calldata;
1384         struct nfs4_state *state = NULL;
1385
1386         /* If this request hasn't been cancelled, do nothing */
1387         if (data->cancelled == 0)
1388                 goto out_free;
1389         /* In case of error, no cleanup! */
1390         if (!data->rpc_done)
1391                 goto out_free;
1392         state = nfs4_opendata_to_nfs4_state(data);
1393         if (!IS_ERR(state))
1394                 nfs4_close_state(state, data->o_arg.fmode);
1395 out_free:
1396         nfs4_opendata_put(data);
1397 }
1398
1399 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1400         .rpc_call_done = nfs4_open_confirm_done,
1401         .rpc_release = nfs4_open_confirm_release,
1402 };
1403
1404 /*
1405  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1406  */
1407 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1408 {
1409         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1410         struct rpc_task *task;
1411         struct  rpc_message msg = {
1412                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1413                 .rpc_argp = &data->c_arg,
1414                 .rpc_resp = &data->c_res,
1415                 .rpc_cred = data->owner->so_cred,
1416         };
1417         struct rpc_task_setup task_setup_data = {
1418                 .rpc_client = server->client,
1419                 .rpc_message = &msg,
1420                 .callback_ops = &nfs4_open_confirm_ops,
1421                 .callback_data = data,
1422                 .workqueue = nfsiod_workqueue,
1423                 .flags = RPC_TASK_ASYNC,
1424         };
1425         int status;
1426
1427         kref_get(&data->kref);
1428         data->rpc_done = 0;
1429         data->rpc_status = 0;
1430         data->timestamp = jiffies;
1431         task = rpc_run_task(&task_setup_data);
1432         if (IS_ERR(task))
1433                 return PTR_ERR(task);
1434         status = nfs4_wait_for_completion_rpc_task(task);
1435         if (status != 0) {
1436                 data->cancelled = 1;
1437                 smp_wmb();
1438         } else
1439                 status = data->rpc_status;
1440         rpc_put_task(task);
1441         return status;
1442 }
1443
1444 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1445 {
1446         struct nfs4_opendata *data = calldata;
1447         struct nfs4_state_owner *sp = data->owner;
1448
1449         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1450                 return;
1451         /*
1452          * Check if we still need to send an OPEN call, or if we can use
1453          * a delegation instead.
1454          */
1455         if (data->state != NULL) {
1456                 struct nfs_delegation *delegation;
1457
1458                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1459                         goto out_no_action;
1460                 rcu_read_lock();
1461                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1462                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1463                     can_open_delegated(delegation, data->o_arg.fmode))
1464                         goto unlock_no_action;
1465                 rcu_read_unlock();
1466         }
1467         /* Update client id. */
1468         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1469         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1470                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1471                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1472         }
1473         data->timestamp = jiffies;
1474         if (nfs4_setup_sequence(data->o_arg.server,
1475                                 &data->o_arg.seq_args,
1476                                 &data->o_res.seq_res, task))
1477                 return;
1478         rpc_call_start(task);
1479         return;
1480 unlock_no_action:
1481         rcu_read_unlock();
1482 out_no_action:
1483         task->tk_action = NULL;
1484
1485 }
1486
1487 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1488 {
1489         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1490         nfs4_open_prepare(task, calldata);
1491 }
1492
1493 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1494 {
1495         struct nfs4_opendata *data = calldata;
1496
1497         data->rpc_status = task->tk_status;
1498
1499         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1500                 return;
1501
1502         if (task->tk_status == 0) {
1503                 switch (data->o_res.f_attr->mode & S_IFMT) {
1504                         case S_IFREG:
1505                                 break;
1506                         case S_IFLNK:
1507                                 data->rpc_status = -ELOOP;
1508                                 break;
1509                         case S_IFDIR:
1510                                 data->rpc_status = -EISDIR;
1511                                 break;
1512                         default:
1513                                 data->rpc_status = -ENOTDIR;
1514                 }
1515                 renew_lease(data->o_res.server, data->timestamp);
1516                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1517                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1518         }
1519         data->rpc_done = 1;
1520 }
1521
1522 static void nfs4_open_release(void *calldata)
1523 {
1524         struct nfs4_opendata *data = calldata;
1525         struct nfs4_state *state = NULL;
1526
1527         /* If this request hasn't been cancelled, do nothing */
1528         if (data->cancelled == 0)
1529                 goto out_free;
1530         /* In case of error, no cleanup! */
1531         if (data->rpc_status != 0 || !data->rpc_done)
1532                 goto out_free;
1533         /* In case we need an open_confirm, no cleanup! */
1534         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1535                 goto out_free;
1536         state = nfs4_opendata_to_nfs4_state(data);
1537         if (!IS_ERR(state))
1538                 nfs4_close_state(state, data->o_arg.fmode);
1539 out_free:
1540         nfs4_opendata_put(data);
1541 }
1542
1543 static const struct rpc_call_ops nfs4_open_ops = {
1544         .rpc_call_prepare = nfs4_open_prepare,
1545         .rpc_call_done = nfs4_open_done,
1546         .rpc_release = nfs4_open_release,
1547 };
1548
1549 static const struct rpc_call_ops nfs4_recover_open_ops = {
1550         .rpc_call_prepare = nfs4_recover_open_prepare,
1551         .rpc_call_done = nfs4_open_done,
1552         .rpc_release = nfs4_open_release,
1553 };
1554
1555 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1556 {
1557         struct inode *dir = data->dir->d_inode;
1558         struct nfs_server *server = NFS_SERVER(dir);
1559         struct nfs_openargs *o_arg = &data->o_arg;
1560         struct nfs_openres *o_res = &data->o_res;
1561         struct rpc_task *task;
1562         struct rpc_message msg = {
1563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1564                 .rpc_argp = o_arg,
1565                 .rpc_resp = o_res,
1566                 .rpc_cred = data->owner->so_cred,
1567         };
1568         struct rpc_task_setup task_setup_data = {
1569                 .rpc_client = server->client,
1570                 .rpc_message = &msg,
1571                 .callback_ops = &nfs4_open_ops,
1572                 .callback_data = data,
1573                 .workqueue = nfsiod_workqueue,
1574                 .flags = RPC_TASK_ASYNC,
1575         };
1576         int status;
1577
1578         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1579         kref_get(&data->kref);
1580         data->rpc_done = 0;
1581         data->rpc_status = 0;
1582         data->cancelled = 0;
1583         if (isrecover)
1584                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1585         task = rpc_run_task(&task_setup_data);
1586         if (IS_ERR(task))
1587                 return PTR_ERR(task);
1588         status = nfs4_wait_for_completion_rpc_task(task);
1589         if (status != 0) {
1590                 data->cancelled = 1;
1591                 smp_wmb();
1592         } else
1593                 status = data->rpc_status;
1594         rpc_put_task(task);
1595
1596         return status;
1597 }
1598
1599 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1600 {
1601         struct inode *dir = data->dir->d_inode;
1602         struct nfs_openres *o_res = &data->o_res;
1603         int status;
1604
1605         status = nfs4_run_open_task(data, 1);
1606         if (status != 0 || !data->rpc_done)
1607                 return status;
1608
1609         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1610
1611         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1612                 status = _nfs4_proc_open_confirm(data);
1613                 if (status != 0)
1614                         return status;
1615         }
1616
1617         return status;
1618 }
1619
1620 /*
1621  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1622  */
1623 static int _nfs4_proc_open(struct nfs4_opendata *data)
1624 {
1625         struct inode *dir = data->dir->d_inode;
1626         struct nfs_server *server = NFS_SERVER(dir);
1627         struct nfs_openargs *o_arg = &data->o_arg;
1628         struct nfs_openres *o_res = &data->o_res;
1629         int status;
1630
1631         status = nfs4_run_open_task(data, 0);
1632         if (!data->rpc_done)
1633                 return status;
1634         if (status != 0) {
1635                 if (status == -NFS4ERR_BADNAME &&
1636                                 !(o_arg->open_flags & O_CREAT))
1637                         return -ENOENT;
1638                 return status;
1639         }
1640
1641         nfs_fattr_map_and_free_names(server, &data->f_attr);
1642
1643         if (o_arg->open_flags & O_CREAT)
1644                 update_changeattr(dir, &o_res->cinfo);
1645         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1646                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1647         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1648                 status = _nfs4_proc_open_confirm(data);
1649                 if (status != 0)
1650                         return status;
1651         }
1652         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1653                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1654         return 0;
1655 }
1656
1657 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1658 {
1659         unsigned int loop;
1660         int ret;
1661
1662         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1663                 ret = nfs4_wait_clnt_recover(clp);
1664                 if (ret != 0)
1665                         break;
1666                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1667                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1668                         break;
1669                 nfs4_schedule_state_manager(clp);
1670                 ret = -EIO;
1671         }
1672         return ret;
1673 }
1674
1675 static int nfs4_recover_expired_lease(struct nfs_server *server)
1676 {
1677         return nfs4_client_recover_expired_lease(server->nfs_client);
1678 }
1679
1680 /*
1681  * OPEN_EXPIRED:
1682  *      reclaim state on the server after a network partition.
1683  *      Assumes caller holds the appropriate lock
1684  */
1685 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1686 {
1687         struct nfs4_opendata *opendata;
1688         int ret;
1689
1690         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1691         if (IS_ERR(opendata))
1692                 return PTR_ERR(opendata);
1693         ret = nfs4_open_recover(opendata, state);
1694         if (ret == -ESTALE)
1695                 d_drop(ctx->dentry);
1696         nfs4_opendata_put(opendata);
1697         return ret;
1698 }
1699
1700 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1701 {
1702         struct nfs_server *server = NFS_SERVER(state->inode);
1703         struct nfs4_exception exception = { };
1704         int err;
1705
1706         do {
1707                 err = _nfs4_open_expired(ctx, state);
1708                 switch (err) {
1709                 default:
1710                         goto out;
1711                 case -NFS4ERR_GRACE:
1712                 case -NFS4ERR_DELAY:
1713                         nfs4_handle_exception(server, err, &exception);
1714                         err = 0;
1715                 }
1716         } while (exception.retry);
1717 out:
1718         return err;
1719 }
1720
1721 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1722 {
1723         struct nfs_open_context *ctx;
1724         int ret;
1725
1726         ctx = nfs4_state_find_open_context(state);
1727         if (IS_ERR(ctx))
1728                 return PTR_ERR(ctx);
1729         ret = nfs4_do_open_expired(ctx, state);
1730         put_nfs_open_context(ctx);
1731         return ret;
1732 }
1733
1734 #if defined(CONFIG_NFS_V4_1)
1735 static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1736 {
1737         int status = NFS_OK;
1738         struct nfs_server *server = NFS_SERVER(state->inode);
1739
1740         if (state->flags & flags) {
1741                 status = nfs41_test_stateid(server, stateid);
1742                 if (status != NFS_OK) {
1743                         nfs41_free_stateid(server, stateid);
1744                         state->flags &= ~flags;
1745                 }
1746         }
1747         return status;
1748 }
1749
1750 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1751 {
1752         int deleg_status, open_status;
1753         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1754         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1755
1756         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1757         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1758
1759         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1760                 return NFS_OK;
1761         return nfs4_open_expired(sp, state);
1762 }
1763 #endif
1764
1765 /*
1766  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1767  * fields corresponding to attributes that were used to store the verifier.
1768  * Make sure we clobber those fields in the later setattr call
1769  */
1770 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1771 {
1772         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1773             !(sattr->ia_valid & ATTR_ATIME_SET))
1774                 sattr->ia_valid |= ATTR_ATIME;
1775
1776         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1777             !(sattr->ia_valid & ATTR_MTIME_SET))
1778                 sattr->ia_valid |= ATTR_MTIME;
1779 }
1780
1781 /*
1782  * Returns a referenced nfs4_state
1783  */
1784 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)
1785 {
1786         struct nfs4_state_owner  *sp;
1787         struct nfs4_state     *state = NULL;
1788         struct nfs_server       *server = NFS_SERVER(dir);
1789         struct nfs4_opendata *opendata;
1790         int status;
1791
1792         /* Protect against reboot recovery conflicts */
1793         status = -ENOMEM;
1794         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1795         if (sp == NULL) {
1796                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1797                 goto out_err;
1798         }
1799         status = nfs4_recover_expired_lease(server);
1800         if (status != 0)
1801                 goto err_put_state_owner;
1802         if (dentry->d_inode != NULL)
1803                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1804         status = -ENOMEM;
1805         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1806         if (opendata == NULL)
1807                 goto err_put_state_owner;
1808
1809         if (dentry->d_inode != NULL)
1810                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1811
1812         status = _nfs4_proc_open(opendata);
1813         if (status != 0)
1814                 goto err_opendata_put;
1815
1816         state = nfs4_opendata_to_nfs4_state(opendata);
1817         status = PTR_ERR(state);
1818         if (IS_ERR(state))
1819                 goto err_opendata_put;
1820         if (server->caps & NFS_CAP_POSIX_LOCK)
1821                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1822
1823         if (opendata->o_arg.open_flags & O_EXCL) {
1824                 nfs4_exclusive_attrset(opendata, sattr);
1825
1826                 nfs_fattr_init(opendata->o_res.f_attr);
1827                 status = nfs4_do_setattr(state->inode, cred,
1828                                 opendata->o_res.f_attr, sattr,
1829                                 state);
1830                 if (status == 0)
1831                         nfs_setattr_update_inode(state->inode, sattr);
1832                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1833         }
1834         nfs4_opendata_put(opendata);
1835         nfs4_put_state_owner(sp);
1836         *res = state;
1837         return 0;
1838 err_opendata_put:
1839         nfs4_opendata_put(opendata);
1840 err_put_state_owner:
1841         nfs4_put_state_owner(sp);
1842 out_err:
1843         *res = NULL;
1844         return status;
1845 }
1846
1847
1848 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)
1849 {
1850         struct nfs4_exception exception = { };
1851         struct nfs4_state *res;
1852         int status;
1853
1854         do {
1855                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1856                 if (status == 0)
1857                         break;
1858                 /* NOTE: BAD_SEQID means the server and client disagree about the
1859                  * book-keeping w.r.t. state-changing operations
1860                  * (OPEN/CLOSE/LOCK/LOCKU...)
1861                  * It is actually a sign of a bug on the client or on the server.
1862                  *
1863                  * If we receive a BAD_SEQID error in the particular case of
1864                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1865                  * have unhashed the old state_owner for us, and that we can
1866                  * therefore safely retry using a new one. We should still warn
1867                  * the user though...
1868                  */
1869                 if (status == -NFS4ERR_BAD_SEQID) {
1870                         pr_warn_ratelimited("NFS: v4 server %s "
1871                                         " returned a bad sequence-id error!\n",
1872                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1873                         exception.retry = 1;
1874                         continue;
1875                 }
1876                 /*
1877                  * BAD_STATEID on OPEN means that the server cancelled our
1878                  * state before it received the OPEN_CONFIRM.
1879                  * Recover by retrying the request as per the discussion
1880                  * on Page 181 of RFC3530.
1881                  */
1882                 if (status == -NFS4ERR_BAD_STATEID) {
1883                         exception.retry = 1;
1884                         continue;
1885                 }
1886                 if (status == -EAGAIN) {
1887                         /* We must have found a delegation */
1888                         exception.retry = 1;
1889                         continue;
1890                 }
1891                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1892                                         status, &exception));
1893         } while (exception.retry);
1894         return res;
1895 }
1896
1897 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1898                             struct nfs_fattr *fattr, struct iattr *sattr,
1899                             struct nfs4_state *state)
1900 {
1901         struct nfs_server *server = NFS_SERVER(inode);
1902         struct nfs_setattrargs  arg = {
1903                 .fh             = NFS_FH(inode),
1904                 .iap            = sattr,
1905                 .server         = server,
1906                 .bitmask = server->attr_bitmask,
1907         };
1908         struct nfs_setattrres  res = {
1909                 .fattr          = fattr,
1910                 .server         = server,
1911         };
1912         struct rpc_message msg = {
1913                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1914                 .rpc_argp       = &arg,
1915                 .rpc_resp       = &res,
1916                 .rpc_cred       = cred,
1917         };
1918         unsigned long timestamp = jiffies;
1919         int status;
1920
1921         nfs_fattr_init(fattr);
1922
1923         if (state != NULL) {
1924                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1925                                 current->files, current->tgid);
1926         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1927                                 FMODE_WRITE)) {
1928                 /* Use that stateid */
1929         } else
1930                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1931
1932         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1933         if (status == 0 && state != NULL)
1934                 renew_lease(server, timestamp);
1935         return status;
1936 }
1937
1938 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1939                            struct nfs_fattr *fattr, struct iattr *sattr,
1940                            struct nfs4_state *state)
1941 {
1942         struct nfs_server *server = NFS_SERVER(inode);
1943         struct nfs4_exception exception = {
1944                 .state = state,
1945                 .inode = inode,
1946         };
1947         int err;
1948         do {
1949                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1950                 switch (err) {
1951                 case -NFS4ERR_OPENMODE:
1952                         if (state && !(state->state & FMODE_WRITE)) {
1953                                 err = -EBADF;
1954                                 if (sattr->ia_valid & ATTR_OPEN)
1955                                         err = -EACCES;
1956                                 goto out;
1957                         }
1958                 }
1959                 err = nfs4_handle_exception(server, err, &exception);
1960         } while (exception.retry);
1961 out:
1962         return err;
1963 }
1964
1965 struct nfs4_closedata {
1966         struct inode *inode;
1967         struct nfs4_state *state;
1968         struct nfs_closeargs arg;
1969         struct nfs_closeres res;
1970         struct nfs_fattr fattr;
1971         unsigned long timestamp;
1972         bool roc;
1973         u32 roc_barrier;
1974 };
1975
1976 static void nfs4_free_closedata(void *data)
1977 {
1978         struct nfs4_closedata *calldata = data;
1979         struct nfs4_state_owner *sp = calldata->state->owner;
1980         struct super_block *sb = calldata->state->inode->i_sb;
1981
1982         if (calldata->roc)
1983                 pnfs_roc_release(calldata->state->inode);
1984         nfs4_put_open_state(calldata->state);
1985         nfs_free_seqid(calldata->arg.seqid);
1986         nfs4_put_state_owner(sp);
1987         nfs_sb_deactive(sb);
1988         kfree(calldata);
1989 }
1990
1991 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1992                 fmode_t fmode)
1993 {
1994         spin_lock(&state->owner->so_lock);
1995         if (!(fmode & FMODE_READ))
1996                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1997         if (!(fmode & FMODE_WRITE))
1998                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1999         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2000         spin_unlock(&state->owner->so_lock);
2001 }
2002
2003 static void nfs4_close_done(struct rpc_task *task, void *data)
2004 {
2005         struct nfs4_closedata *calldata = data;
2006         struct nfs4_state *state = calldata->state;
2007         struct nfs_server *server = NFS_SERVER(calldata->inode);
2008
2009         dprintk("%s: begin!\n", __func__);
2010         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2011                 return;
2012         /* hmm. we are done with the inode, and in the process of freeing
2013          * the state_owner. we keep this around to process errors
2014          */
2015         switch (task->tk_status) {
2016                 case 0:
2017                         if (calldata->roc)
2018                                 pnfs_roc_set_barrier(state->inode,
2019                                                      calldata->roc_barrier);
2020                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2021                         renew_lease(server, calldata->timestamp);
2022                         nfs4_close_clear_stateid_flags(state,
2023                                         calldata->arg.fmode);
2024                         break;
2025                 case -NFS4ERR_STALE_STATEID:
2026                 case -NFS4ERR_OLD_STATEID:
2027                 case -NFS4ERR_BAD_STATEID:
2028                 case -NFS4ERR_EXPIRED:
2029                         if (calldata->arg.fmode == 0)
2030                                 break;
2031                 default:
2032                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2033                                 rpc_restart_call_prepare(task);
2034         }
2035         nfs_release_seqid(calldata->arg.seqid);
2036         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2037         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2038 }
2039
2040 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2041 {
2042         struct nfs4_closedata *calldata = data;
2043         struct nfs4_state *state = calldata->state;
2044         int call_close = 0;
2045
2046         dprintk("%s: begin!\n", __func__);
2047         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2048                 return;
2049
2050         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2051         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2052         spin_lock(&state->owner->so_lock);
2053         /* Calculate the change in open mode */
2054         if (state->n_rdwr == 0) {
2055                 if (state->n_rdonly == 0) {
2056                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2057                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2058                         calldata->arg.fmode &= ~FMODE_READ;
2059                 }
2060                 if (state->n_wronly == 0) {
2061                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2062                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2063                         calldata->arg.fmode &= ~FMODE_WRITE;
2064                 }
2065         }
2066         spin_unlock(&state->owner->so_lock);
2067
2068         if (!call_close) {
2069                 /* Note: exit _without_ calling nfs4_close_done */
2070                 task->tk_action = NULL;
2071                 goto out;
2072         }
2073
2074         if (calldata->arg.fmode == 0) {
2075                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2076                 if (calldata->roc &&
2077                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2078                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2079                                      task, NULL);
2080                         goto out;
2081                 }
2082         }
2083
2084         nfs_fattr_init(calldata->res.fattr);
2085         calldata->timestamp = jiffies;
2086         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2087                                 &calldata->arg.seq_args,
2088                                 &calldata->res.seq_res,
2089                                 task))
2090                 goto out;
2091         rpc_call_start(task);
2092 out:
2093         dprintk("%s: done!\n", __func__);
2094 }
2095
2096 static const struct rpc_call_ops nfs4_close_ops = {
2097         .rpc_call_prepare = nfs4_close_prepare,
2098         .rpc_call_done = nfs4_close_done,
2099         .rpc_release = nfs4_free_closedata,
2100 };
2101
2102 /*
2103  * It is possible for data to be read/written from a mem-mapped file
2104  * after the sys_close call (which hits the vfs layer as a flush).
2105  * This means that we can't safely call nfsv4 close on a file until
2106  * the inode is cleared. This in turn means that we are not good
2107  * NFSv4 citizens - we do not indicate to the server to update the file's
2108  * share state even when we are done with one of the three share
2109  * stateid's in the inode.
2110  *
2111  * NOTE: Caller must be holding the sp->so_owner semaphore!
2112  */
2113 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2114 {
2115         struct nfs_server *server = NFS_SERVER(state->inode);
2116         struct nfs4_closedata *calldata;
2117         struct nfs4_state_owner *sp = state->owner;
2118         struct rpc_task *task;
2119         struct rpc_message msg = {
2120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2121                 .rpc_cred = state->owner->so_cred,
2122         };
2123         struct rpc_task_setup task_setup_data = {
2124                 .rpc_client = server->client,
2125                 .rpc_message = &msg,
2126                 .callback_ops = &nfs4_close_ops,
2127                 .workqueue = nfsiod_workqueue,
2128                 .flags = RPC_TASK_ASYNC,
2129         };
2130         int status = -ENOMEM;
2131
2132         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2133         if (calldata == NULL)
2134                 goto out;
2135         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2136         calldata->inode = state->inode;
2137         calldata->state = state;
2138         calldata->arg.fh = NFS_FH(state->inode);
2139         calldata->arg.stateid = &state->open_stateid;
2140         /* Serialization for the sequence id */
2141         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2142         if (calldata->arg.seqid == NULL)
2143                 goto out_free_calldata;
2144         calldata->arg.fmode = 0;
2145         calldata->arg.bitmask = server->cache_consistency_bitmask;
2146         calldata->res.fattr = &calldata->fattr;
2147         calldata->res.seqid = calldata->arg.seqid;
2148         calldata->res.server = server;
2149         calldata->roc = roc;
2150         nfs_sb_active(calldata->inode->i_sb);
2151
2152         msg.rpc_argp = &calldata->arg;
2153         msg.rpc_resp = &calldata->res;
2154         task_setup_data.callback_data = calldata;
2155         task = rpc_run_task(&task_setup_data);
2156         if (IS_ERR(task))
2157                 return PTR_ERR(task);
2158         status = 0;
2159         if (wait)
2160                 status = rpc_wait_for_completion_task(task);
2161         rpc_put_task(task);
2162         return status;
2163 out_free_calldata:
2164         kfree(calldata);
2165 out:
2166         if (roc)
2167                 pnfs_roc_release(state->inode);
2168         nfs4_put_open_state(state);
2169         nfs4_put_state_owner(sp);
2170         return status;
2171 }
2172
2173 static struct inode *
2174 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2175 {
2176         struct nfs4_state *state;
2177
2178         /* Protect against concurrent sillydeletes */
2179         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2180         if (IS_ERR(state))
2181                 return ERR_CAST(state);
2182         ctx->state = state;
2183         return igrab(state->inode);
2184 }
2185
2186 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2187 {
2188         if (ctx->state == NULL)
2189                 return;
2190         if (is_sync)
2191                 nfs4_close_sync(ctx->state, ctx->mode);
2192         else
2193                 nfs4_close_state(ctx->state, ctx->mode);
2194 }
2195
2196 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2197 {
2198         struct nfs4_server_caps_arg args = {
2199                 .fhandle = fhandle,
2200         };
2201         struct nfs4_server_caps_res res = {};
2202         struct rpc_message msg = {
2203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2204                 .rpc_argp = &args,
2205                 .rpc_resp = &res,
2206         };
2207         int status;
2208
2209         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2210         if (status == 0) {
2211                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2212                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2213                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2214                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2215                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2216                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2217                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2218                         server->caps |= NFS_CAP_ACLS;
2219                 if (res.has_links != 0)
2220                         server->caps |= NFS_CAP_HARDLINKS;
2221                 if (res.has_symlinks != 0)
2222                         server->caps |= NFS_CAP_SYMLINKS;
2223                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2224                         server->caps |= NFS_CAP_FILEID;
2225                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2226                         server->caps |= NFS_CAP_MODE;
2227                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2228                         server->caps |= NFS_CAP_NLINK;
2229                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2230                         server->caps |= NFS_CAP_OWNER;
2231                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2232                         server->caps |= NFS_CAP_OWNER_GROUP;
2233                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2234                         server->caps |= NFS_CAP_ATIME;
2235                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2236                         server->caps |= NFS_CAP_CTIME;
2237                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2238                         server->caps |= NFS_CAP_MTIME;
2239
2240                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2241                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2242                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2243                 server->acl_bitmask = res.acl_bitmask;
2244                 server->fh_expire_type = res.fh_expire_type;
2245         }
2246
2247         return status;
2248 }
2249
2250 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2251 {
2252         struct nfs4_exception exception = { };
2253         int err;
2254         do {
2255                 err = nfs4_handle_exception(server,
2256                                 _nfs4_server_capabilities(server, fhandle),
2257                                 &exception);
2258         } while (exception.retry);
2259         return err;
2260 }
2261
2262 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2263                 struct nfs_fsinfo *info)
2264 {
2265         struct nfs4_lookup_root_arg args = {
2266                 .bitmask = nfs4_fattr_bitmap,
2267         };
2268         struct nfs4_lookup_res res = {
2269                 .server = server,
2270                 .fattr = info->fattr,
2271                 .fh = fhandle,
2272         };
2273         struct rpc_message msg = {
2274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2275                 .rpc_argp = &args,
2276                 .rpc_resp = &res,
2277         };
2278
2279         nfs_fattr_init(info->fattr);
2280         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2281 }
2282
2283 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2284                 struct nfs_fsinfo *info)
2285 {
2286         struct nfs4_exception exception = { };
2287         int err;
2288         do {
2289                 err = _nfs4_lookup_root(server, fhandle, info);
2290                 switch (err) {
2291                 case 0:
2292                 case -NFS4ERR_WRONGSEC:
2293                         goto out;
2294                 default:
2295                         err = nfs4_handle_exception(server, err, &exception);
2296                 }
2297         } while (exception.retry);
2298 out:
2299         return err;
2300 }
2301
2302 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2303                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2304 {
2305         struct rpc_auth *auth;
2306         int ret;
2307
2308         auth = rpcauth_create(flavor, server->client);
2309         if (!auth) {
2310                 ret = -EIO;
2311                 goto out;
2312         }
2313         ret = nfs4_lookup_root(server, fhandle, info);
2314 out:
2315         return ret;
2316 }
2317
2318 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2319                               struct nfs_fsinfo *info)
2320 {
2321         int i, len, status = 0;
2322         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2323
2324         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2325         flav_array[len] = RPC_AUTH_NULL;
2326         len += 1;
2327
2328         for (i = 0; i < len; i++) {
2329                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2330                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2331                         continue;
2332                 break;
2333         }
2334         /*
2335          * -EACCESS could mean that the user doesn't have correct permissions
2336          * to access the mount.  It could also mean that we tried to mount
2337          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2338          * existing mount programs don't handle -EACCES very well so it should
2339          * be mapped to -EPERM instead.
2340          */
2341         if (status == -EACCES)
2342                 status = -EPERM;
2343         return status;
2344 }
2345
2346 /*
2347  * get the file handle for the "/" directory on the server
2348  */
2349 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2350                          struct nfs_fsinfo *info)
2351 {
2352         int minor_version = server->nfs_client->cl_minorversion;
2353         int status = nfs4_lookup_root(server, fhandle, info);
2354         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2355                 /*
2356                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2357                  * by nfs4_map_errors() as this function exits.
2358                  */
2359                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2360         if (status == 0)
2361                 status = nfs4_server_capabilities(server, fhandle);
2362         if (status == 0)
2363                 status = nfs4_do_fsinfo(server, fhandle, info);
2364         return nfs4_map_errors(status);
2365 }
2366
2367 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2368                               struct nfs_fsinfo *info)
2369 {
2370         int error;
2371         struct nfs_fattr *fattr = info->fattr;
2372
2373         error = nfs4_server_capabilities(server, mntfh);
2374         if (error < 0) {
2375                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2376                 return error;
2377         }
2378
2379         error = nfs4_proc_getattr(server, mntfh, fattr);
2380         if (error < 0) {
2381                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2382                 return error;
2383         }
2384
2385         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2386             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2387                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2388
2389         return error;
2390 }
2391
2392 /*
2393  * Get locations and (maybe) other attributes of a referral.
2394  * Note that we'll actually follow the referral later when
2395  * we detect fsid mismatch in inode revalidation
2396  */
2397 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2398                              const struct qstr *name, struct nfs_fattr *fattr,
2399                              struct nfs_fh *fhandle)
2400 {
2401         int status = -ENOMEM;
2402         struct page *page = NULL;
2403         struct nfs4_fs_locations *locations = NULL;
2404
2405         page = alloc_page(GFP_KERNEL);
2406         if (page == NULL)
2407                 goto out;
2408         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2409         if (locations == NULL)
2410                 goto out;
2411
2412         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2413         if (status != 0)
2414                 goto out;
2415         /* Make sure server returned a different fsid for the referral */
2416         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2417                 dprintk("%s: server did not return a different fsid for"
2418                         " a referral at %s\n", __func__, name->name);
2419                 status = -EIO;
2420                 goto out;
2421         }
2422         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2423         nfs_fixup_referral_attributes(&locations->fattr);
2424
2425         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2426         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2427         memset(fhandle, 0, sizeof(struct nfs_fh));
2428 out:
2429         if (page)
2430                 __free_page(page);
2431         kfree(locations);
2432         return status;
2433 }
2434
2435 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2436 {
2437         struct nfs4_getattr_arg args = {
2438                 .fh = fhandle,
2439                 .bitmask = server->attr_bitmask,
2440         };
2441         struct nfs4_getattr_res res = {
2442                 .fattr = fattr,
2443                 .server = server,
2444         };
2445         struct rpc_message msg = {
2446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2447                 .rpc_argp = &args,
2448                 .rpc_resp = &res,
2449         };
2450
2451         nfs_fattr_init(fattr);
2452         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2453 }
2454
2455 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2456 {
2457         struct nfs4_exception exception = { };
2458         int err;
2459         do {
2460                 err = nfs4_handle_exception(server,
2461                                 _nfs4_proc_getattr(server, fhandle, fattr),
2462                                 &exception);
2463         } while (exception.retry);
2464         return err;
2465 }
2466
2467 /*
2468  * The file is not closed if it is opened due to the a request to change
2469  * the size of the file. The open call will not be needed once the
2470  * VFS layer lookup-intents are implemented.
2471  *
2472  * Close is called when the inode is destroyed.
2473  * If we haven't opened the file for O_WRONLY, we
2474  * need to in the size_change case to obtain a stateid.
2475  *
2476  * Got race?
2477  * Because OPEN is always done by name in nfsv4, it is
2478  * possible that we opened a different file by the same
2479  * name.  We can recognize this race condition, but we
2480  * can't do anything about it besides returning an error.
2481  *
2482  * This will be fixed with VFS changes (lookup-intent).
2483  */
2484 static int
2485 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2486                   struct iattr *sattr)
2487 {
2488         struct inode *inode = dentry->d_inode;
2489         struct rpc_cred *cred = NULL;
2490         struct nfs4_state *state = NULL;
2491         int status;
2492
2493         if (pnfs_ld_layoutret_on_setattr(inode))
2494                 pnfs_return_layout(inode);
2495
2496         nfs_fattr_init(fattr);
2497
2498         /* Search for an existing open(O_WRITE) file */
2499         if (sattr->ia_valid & ATTR_FILE) {
2500                 struct nfs_open_context *ctx;
2501
2502                 ctx = nfs_file_open_context(sattr->ia_file);
2503                 if (ctx) {
2504                         cred = ctx->cred;
2505                         state = ctx->state;
2506                 }
2507         }
2508
2509         /* Deal with open(O_TRUNC) */
2510         if (sattr->ia_valid & ATTR_OPEN)
2511                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2512
2513         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2514         if (status == 0)
2515                 nfs_setattr_update_inode(inode, sattr);
2516         return status;
2517 }
2518
2519 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2520                 const struct qstr *name, struct nfs_fh *fhandle,
2521                 struct nfs_fattr *fattr)
2522 {
2523         struct nfs_server *server = NFS_SERVER(dir);
2524         int                    status;
2525         struct nfs4_lookup_arg args = {
2526                 .bitmask = server->attr_bitmask,
2527                 .dir_fh = NFS_FH(dir),
2528                 .name = name,
2529         };
2530         struct nfs4_lookup_res res = {
2531                 .server = server,
2532                 .fattr = fattr,
2533                 .fh = fhandle,
2534         };
2535         struct rpc_message msg = {
2536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2537                 .rpc_argp = &args,
2538                 .rpc_resp = &res,
2539         };
2540
2541         nfs_fattr_init(fattr);
2542
2543         dprintk("NFS call  lookup %s\n", name->name);
2544         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2545         dprintk("NFS reply lookup: %d\n", status);
2546         return status;
2547 }
2548
2549 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2550 {
2551         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2552                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2553         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2554         fattr->nlink = 2;
2555 }
2556
2557 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2558                                    struct qstr *name, struct nfs_fh *fhandle,
2559                                    struct nfs_fattr *fattr)
2560 {
2561         struct nfs4_exception exception = { };
2562         struct rpc_clnt *client = *clnt;
2563         int err;
2564         do {
2565                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2566                 switch (err) {
2567                 case -NFS4ERR_BADNAME:
2568                         err = -ENOENT;
2569                         goto out;
2570                 case -NFS4ERR_MOVED:
2571                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2572                         goto out;
2573                 case -NFS4ERR_WRONGSEC:
2574                         err = -EPERM;
2575                         if (client != *clnt)
2576                                 goto out;
2577
2578                         client = nfs4_create_sec_client(client, dir, name);
2579                         if (IS_ERR(client))
2580                                 return PTR_ERR(client);
2581
2582                         exception.retry = 1;
2583                         break;
2584                 default:
2585                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2586                 }
2587         } while (exception.retry);
2588
2589 out:
2590         if (err == 0)
2591                 *clnt = client;
2592         else if (client != *clnt)
2593                 rpc_shutdown_client(client);
2594
2595         return err;
2596 }
2597
2598 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2599                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2600 {
2601         int status;
2602         struct rpc_clnt *client = NFS_CLIENT(dir);
2603
2604         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2605         if (client != NFS_CLIENT(dir)) {
2606                 rpc_shutdown_client(client);
2607                 nfs_fixup_secinfo_attributes(fattr);
2608         }
2609         return status;
2610 }
2611
2612 struct rpc_clnt *
2613 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2614                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2615 {
2616         int status;
2617         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2618
2619         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2620         if (status < 0) {
2621                 rpc_shutdown_client(client);
2622                 return ERR_PTR(status);
2623         }
2624         return client;
2625 }
2626
2627 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2628 {
2629         struct nfs_server *server = NFS_SERVER(inode);
2630         struct nfs4_accessargs args = {
2631                 .fh = NFS_FH(inode),
2632                 .bitmask = server->cache_consistency_bitmask,
2633         };
2634         struct nfs4_accessres res = {
2635                 .server = server,
2636         };
2637         struct rpc_message msg = {
2638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2639                 .rpc_argp = &args,
2640                 .rpc_resp = &res,
2641                 .rpc_cred = entry->cred,
2642         };
2643         int mode = entry->mask;
2644         int status;
2645
2646         /*
2647          * Determine which access bits we want to ask for...
2648          */
2649         if (mode & MAY_READ)
2650                 args.access |= NFS4_ACCESS_READ;
2651         if (S_ISDIR(inode->i_mode)) {
2652                 if (mode & MAY_WRITE)
2653                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2654                 if (mode & MAY_EXEC)
2655                         args.access |= NFS4_ACCESS_LOOKUP;
2656         } else {
2657                 if (mode & MAY_WRITE)
2658                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2659                 if (mode & MAY_EXEC)
2660                         args.access |= NFS4_ACCESS_EXECUTE;
2661         }
2662
2663         res.fattr = nfs_alloc_fattr();
2664         if (res.fattr == NULL)
2665                 return -ENOMEM;
2666
2667         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2668         if (!status) {
2669                 entry->mask = 0;
2670                 if (res.access & NFS4_ACCESS_READ)
2671                         entry->mask |= MAY_READ;
2672                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2673                         entry->mask |= MAY_WRITE;
2674                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2675                         entry->mask |= MAY_EXEC;
2676                 nfs_refresh_inode(inode, res.fattr);
2677         }
2678         nfs_free_fattr(res.fattr);
2679         return status;
2680 }
2681
2682 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2683 {
2684         struct nfs4_exception exception = { };
2685         int err;
2686         do {
2687                 err = nfs4_handle_exception(NFS_SERVER(inode),
2688                                 _nfs4_proc_access(inode, entry),
2689                                 &exception);
2690         } while (exception.retry);
2691         return err;
2692 }
2693
2694 /*
2695  * TODO: For the time being, we don't try to get any attributes
2696  * along with any of the zero-copy operations READ, READDIR,
2697  * READLINK, WRITE.
2698  *
2699  * In the case of the first three, we want to put the GETATTR
2700  * after the read-type operation -- this is because it is hard
2701  * to predict the length of a GETATTR response in v4, and thus
2702  * align the READ data correctly.  This means that the GETATTR
2703  * may end up partially falling into the page cache, and we should
2704  * shift it into the 'tail' of the xdr_buf before processing.
2705  * To do this efficiently, we need to know the total length
2706  * of data received, which doesn't seem to be available outside
2707  * of the RPC layer.
2708  *
2709  * In the case of WRITE, we also want to put the GETATTR after
2710  * the operation -- in this case because we want to make sure
2711  * we get the post-operation mtime and size.  This means that
2712  * we can't use xdr_encode_pages() as written: we need a variant
2713  * of it which would leave room in the 'tail' iovec.
2714  *
2715  * Both of these changes to the XDR layer would in fact be quite
2716  * minor, but I decided to leave them for a subsequent patch.
2717  */
2718 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2719                 unsigned int pgbase, unsigned int pglen)
2720 {
2721         struct nfs4_readlink args = {
2722                 .fh       = NFS_FH(inode),
2723                 .pgbase   = pgbase,
2724                 .pglen    = pglen,
2725                 .pages    = &page,
2726         };
2727         struct nfs4_readlink_res res;
2728         struct rpc_message msg = {
2729                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2730                 .rpc_argp = &args,
2731                 .rpc_resp = &res,
2732         };
2733
2734         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2735 }
2736
2737 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2738                 unsigned int pgbase, unsigned int pglen)
2739 {
2740         struct nfs4_exception exception = { };
2741         int err;
2742         do {
2743                 err = nfs4_handle_exception(NFS_SERVER(inode),
2744                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2745                                 &exception);
2746         } while (exception.retry);
2747         return err;
2748 }
2749
2750 /*
2751  * Got race?
2752  * We will need to arrange for the VFS layer to provide an atomic open.
2753  * Until then, this create/open method is prone to inefficiency and race
2754  * conditions due to the lookup, create, and open VFS calls from sys_open()
2755  * placed on the wire.
2756  *
2757  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2758  * The file will be opened again in the subsequent VFS open call
2759  * (nfs4_proc_file_open).
2760  *
2761  * The open for read will just hang around to be used by any process that
2762  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2763  */
2764
2765 static int
2766 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2767                  int flags, struct nfs_open_context *ctx)
2768 {
2769         struct dentry *de = dentry;
2770         struct nfs4_state *state;
2771         struct rpc_cred *cred = NULL;
2772         fmode_t fmode = 0;
2773         int status = 0;
2774
2775         if (ctx != NULL) {
2776                 cred = ctx->cred;
2777                 de = ctx->dentry;
2778                 fmode = ctx->mode;
2779         }
2780         sattr->ia_mode &= ~current_umask();
2781         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2782         d_drop(dentry);
2783         if (IS_ERR(state)) {
2784                 status = PTR_ERR(state);
2785                 goto out;
2786         }
2787         d_add(dentry, igrab(state->inode));
2788         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2789         if (ctx != NULL)
2790                 ctx->state = state;
2791         else
2792                 nfs4_close_sync(state, fmode);
2793 out:
2794         return status;
2795 }
2796
2797 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2798 {
2799         struct nfs_server *server = NFS_SERVER(dir);
2800         struct nfs_removeargs args = {
2801                 .fh = NFS_FH(dir),
2802                 .name.len = name->len,
2803                 .name.name = name->name,
2804         };
2805         struct nfs_removeres res = {
2806                 .server = server,
2807         };
2808         struct rpc_message msg = {
2809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2810                 .rpc_argp = &args,
2811                 .rpc_resp = &res,
2812         };
2813         int status;
2814
2815         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2816         if (status == 0)
2817                 update_changeattr(dir, &res.cinfo);
2818         return status;
2819 }
2820
2821 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2822 {
2823         struct nfs4_exception exception = { };
2824         int err;
2825         do {
2826                 err = nfs4_handle_exception(NFS_SERVER(dir),
2827                                 _nfs4_proc_remove(dir, name),
2828                                 &exception);
2829         } while (exception.retry);
2830         return err;
2831 }
2832
2833 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2834 {
2835         struct nfs_server *server = NFS_SERVER(dir);
2836         struct nfs_removeargs *args = msg->rpc_argp;
2837         struct nfs_removeres *res = msg->rpc_resp;
2838
2839         res->server = server;
2840         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2841         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2842 }
2843
2844 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2845 {
2846         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2847                                 &data->args.seq_args,
2848                                 &data->res.seq_res,
2849                                 task))
2850                 return;
2851         rpc_call_start(task);
2852 }
2853
2854 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2855 {
2856         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2857
2858         if (!nfs4_sequence_done(task, &res->seq_res))
2859                 return 0;
2860         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2861                 return 0;
2862         update_changeattr(dir, &res->cinfo);
2863         return 1;
2864 }
2865
2866 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2867 {
2868         struct nfs_server *server = NFS_SERVER(dir);
2869         struct nfs_renameargs *arg = msg->rpc_argp;
2870         struct nfs_renameres *res = msg->rpc_resp;
2871
2872         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2873         res->server = server;
2874         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2875 }
2876
2877 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2878 {
2879         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2880                                 &data->args.seq_args,
2881                                 &data->res.seq_res,
2882                                 task))
2883                 return;
2884         rpc_call_start(task);
2885 }
2886
2887 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2888                                  struct inode *new_dir)
2889 {
2890         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2891
2892         if (!nfs4_sequence_done(task, &res->seq_res))
2893                 return 0;
2894         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2895                 return 0;
2896
2897         update_changeattr(old_dir, &res->old_cinfo);
2898         update_changeattr(new_dir, &res->new_cinfo);
2899         return 1;
2900 }
2901
2902 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2903                 struct inode *new_dir, struct qstr *new_name)
2904 {
2905         struct nfs_server *server = NFS_SERVER(old_dir);
2906         struct nfs_renameargs arg = {
2907                 .old_dir = NFS_FH(old_dir),
2908                 .new_dir = NFS_FH(new_dir),
2909                 .old_name = old_name,
2910                 .new_name = new_name,
2911         };
2912         struct nfs_renameres res = {
2913                 .server = server,
2914         };
2915         struct rpc_message msg = {
2916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2917                 .rpc_argp = &arg,
2918                 .rpc_resp = &res,
2919         };
2920         int status = -ENOMEM;
2921
2922         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2923         if (!status) {
2924                 update_changeattr(old_dir, &res.old_cinfo);
2925                 update_changeattr(new_dir, &res.new_cinfo);
2926         }
2927         return status;
2928 }
2929
2930 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2931                 struct inode *new_dir, struct qstr *new_name)
2932 {
2933         struct nfs4_exception exception = { };
2934         int err;
2935         do {
2936                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2937                                 _nfs4_proc_rename(old_dir, old_name,
2938                                         new_dir, new_name),
2939                                 &exception);
2940         } while (exception.retry);
2941         return err;
2942 }
2943
2944 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2945 {
2946         struct nfs_server *server = NFS_SERVER(inode);
2947         struct nfs4_link_arg arg = {
2948                 .fh     = NFS_FH(inode),
2949                 .dir_fh = NFS_FH(dir),
2950                 .name   = name,
2951                 .bitmask = server->attr_bitmask,
2952         };
2953         struct nfs4_link_res res = {
2954                 .server = server,
2955         };
2956         struct rpc_message msg = {
2957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2958                 .rpc_argp = &arg,
2959                 .rpc_resp = &res,
2960         };
2961         int status = -ENOMEM;
2962
2963         res.fattr = nfs_alloc_fattr();
2964         if (res.fattr == NULL)
2965                 goto out;
2966
2967         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2968         if (!status) {
2969                 update_changeattr(dir, &res.cinfo);
2970                 nfs_post_op_update_inode(inode, res.fattr);
2971         }
2972 out:
2973         nfs_free_fattr(res.fattr);
2974         return status;
2975 }
2976
2977 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2978 {
2979         struct nfs4_exception exception = { };
2980         int err;
2981         do {
2982                 err = nfs4_handle_exception(NFS_SERVER(inode),
2983                                 _nfs4_proc_link(inode, dir, name),
2984                                 &exception);
2985         } while (exception.retry);
2986         return err;
2987 }
2988
2989 struct nfs4_createdata {
2990         struct rpc_message msg;
2991         struct nfs4_create_arg arg;
2992         struct nfs4_create_res res;
2993         struct nfs_fh fh;
2994         struct nfs_fattr fattr;
2995 };
2996
2997 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2998                 struct qstr *name, struct iattr *sattr, u32 ftype)
2999 {
3000         struct nfs4_createdata *data;
3001
3002         data = kzalloc(sizeof(*data), GFP_KERNEL);
3003         if (data != NULL) {
3004                 struct nfs_server *server = NFS_SERVER(dir);
3005
3006                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3007                 data->msg.rpc_argp = &data->arg;
3008                 data->msg.rpc_resp = &data->res;
3009                 data->arg.dir_fh = NFS_FH(dir);
3010                 data->arg.server = server;
3011                 data->arg.name = name;
3012                 data->arg.attrs = sattr;
3013                 data->arg.ftype = ftype;
3014                 data->arg.bitmask = server->attr_bitmask;
3015                 data->res.server = server;
3016                 data->res.fh = &data->fh;
3017                 data->res.fattr = &data->fattr;
3018                 nfs_fattr_init(data->res.fattr);
3019         }
3020         return data;
3021 }
3022
3023 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3024 {
3025         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3026                                     &data->arg.seq_args, &data->res.seq_res, 1);
3027         if (status == 0) {
3028                 update_changeattr(dir, &data->res.dir_cinfo);
3029                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3030         }
3031         return status;
3032 }
3033
3034 static void nfs4_free_createdata(struct nfs4_createdata *data)
3035 {
3036         kfree(data);
3037 }
3038
3039 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3040                 struct page *page, unsigned int len, struct iattr *sattr)
3041 {
3042         struct nfs4_createdata *data;
3043         int status = -ENAMETOOLONG;
3044
3045         if (len > NFS4_MAXPATHLEN)
3046                 goto out;
3047
3048         status = -ENOMEM;
3049         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3050         if (data == NULL)
3051                 goto out;
3052
3053         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3054         data->arg.u.symlink.pages = &page;
3055         data->arg.u.symlink.len = len;
3056
3057         status = nfs4_do_create(dir, dentry, data);
3058
3059         nfs4_free_createdata(data);
3060 out:
3061         return status;
3062 }
3063
3064 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3065                 struct page *page, unsigned int len, struct iattr *sattr)
3066 {
3067         struct nfs4_exception exception = { };
3068         int err;
3069         do {
3070                 err = nfs4_handle_exception(NFS_SERVER(dir),
3071                                 _nfs4_proc_symlink(dir, dentry, page,
3072                                                         len, sattr),
3073                                 &exception);
3074         } while (exception.retry);
3075         return err;
3076 }
3077
3078 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3079                 struct iattr *sattr)
3080 {
3081         struct nfs4_createdata *data;
3082         int status = -ENOMEM;
3083
3084         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3085         if (data == NULL)
3086                 goto out;
3087
3088         status = nfs4_do_create(dir, dentry, data);
3089
3090         nfs4_free_createdata(data);
3091 out:
3092         return status;
3093 }
3094
3095 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3096                 struct iattr *sattr)
3097 {
3098         struct nfs4_exception exception = { };
3099         int err;
3100
3101         sattr->ia_mode &= ~current_umask();
3102         do {
3103                 err = nfs4_handle_exception(NFS_SERVER(dir),
3104                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3105                                 &exception);
3106         } while (exception.retry);
3107         return err;
3108 }
3109
3110 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3111                 u64 cookie, struct page **pages, unsigned int count, int plus)
3112 {
3113         struct inode            *dir = dentry->d_inode;
3114         struct nfs4_readdir_arg args = {
3115                 .fh = NFS_FH(dir),
3116                 .pages = pages,
3117                 .pgbase = 0,
3118                 .count = count,
3119                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3120                 .plus = plus,
3121         };
3122         struct nfs4_readdir_res res;
3123         struct rpc_message msg = {
3124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3125                 .rpc_argp = &args,
3126                 .rpc_resp = &res,
3127                 .rpc_cred = cred,
3128         };
3129         int                     status;
3130
3131         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3132                         dentry->d_parent->d_name.name,
3133                         dentry->d_name.name,
3134                         (unsigned long long)cookie);
3135         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3136         res.pgbase = args.pgbase;
3137         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3138         if (status >= 0) {
3139                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3140                 status += args.pgbase;
3141         }
3142
3143         nfs_invalidate_atime(dir);
3144
3145         dprintk("%s: returns %d\n", __func__, status);
3146         return status;
3147 }
3148
3149 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3150                 u64 cookie, struct page **pages, unsigned int count, int plus)
3151 {
3152         struct nfs4_exception exception = { };
3153         int err;
3154         do {
3155                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3156                                 _nfs4_proc_readdir(dentry, cred, cookie,
3157                                         pages, count, plus),
3158                                 &exception);
3159         } while (exception.retry);
3160         return err;
3161 }
3162
3163 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3164                 struct iattr *sattr, dev_t rdev)
3165 {
3166         struct nfs4_createdata *data;
3167         int mode = sattr->ia_mode;
3168         int status = -ENOMEM;
3169
3170         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3171         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3172
3173         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3174         if (data == NULL)
3175                 goto out;
3176
3177         if (S_ISFIFO(mode))
3178                 data->arg.ftype = NF4FIFO;
3179         else if (S_ISBLK(mode)) {
3180                 data->arg.ftype = NF4BLK;
3181                 data->arg.u.device.specdata1 = MAJOR(rdev);
3182                 data->arg.u.device.specdata2 = MINOR(rdev);
3183         }
3184         else if (S_ISCHR(mode)) {
3185                 data->arg.ftype = NF4CHR;
3186                 data->arg.u.device.specdata1 = MAJOR(rdev);
3187                 data->arg.u.device.specdata2 = MINOR(rdev);
3188         }
3189
3190         status = nfs4_do_create(dir, dentry, data);
3191
3192         nfs4_free_createdata(data);
3193 out:
3194         return status;
3195 }
3196
3197 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3198                 struct iattr *sattr, dev_t rdev)
3199 {
3200         struct nfs4_exception exception = { };
3201         int err;
3202
3203         sattr->ia_mode &= ~current_umask();
3204         do {
3205                 err = nfs4_handle_exception(NFS_SERVER(dir),
3206                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3207                                 &exception);
3208         } while (exception.retry);
3209         return err;
3210 }
3211
3212 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3213                  struct nfs_fsstat *fsstat)
3214 {
3215         struct nfs4_statfs_arg args = {
3216                 .fh = fhandle,
3217                 .bitmask = server->attr_bitmask,
3218         };
3219         struct nfs4_statfs_res res = {
3220                 .fsstat = fsstat,
3221         };
3222         struct rpc_message msg = {
3223                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3224                 .rpc_argp = &args,
3225                 .rpc_resp = &res,
3226         };
3227
3228         nfs_fattr_init(fsstat->fattr);
3229         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3230 }
3231
3232 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3233 {
3234         struct nfs4_exception exception = { };
3235         int err;
3236         do {
3237                 err = nfs4_handle_exception(server,
3238                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3239                                 &exception);
3240         } while (exception.retry);
3241         return err;
3242 }
3243
3244 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3245                 struct nfs_fsinfo *fsinfo)
3246 {
3247         struct nfs4_fsinfo_arg args = {
3248                 .fh = fhandle,
3249                 .bitmask = server->attr_bitmask,
3250         };
3251         struct nfs4_fsinfo_res res = {
3252                 .fsinfo = fsinfo,
3253         };
3254         struct rpc_message msg = {
3255                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3256                 .rpc_argp = &args,
3257                 .rpc_resp = &res,
3258         };
3259
3260         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3261 }
3262
3263 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3264 {
3265         struct nfs4_exception exception = { };
3266         int err;
3267
3268         do {
3269                 err = nfs4_handle_exception(server,
3270                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3271                                 &exception);
3272         } while (exception.retry);
3273         return err;
3274 }
3275
3276 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3277 {
3278         nfs_fattr_init(fsinfo->fattr);
3279         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3280 }
3281
3282 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3283                 struct nfs_pathconf *pathconf)
3284 {
3285         struct nfs4_pathconf_arg args = {
3286                 .fh = fhandle,
3287                 .bitmask = server->attr_bitmask,
3288         };
3289         struct nfs4_pathconf_res res = {
3290                 .pathconf = pathconf,
3291         };
3292         struct rpc_message msg = {
3293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3294                 .rpc_argp = &args,
3295                 .rpc_resp = &res,
3296         };
3297
3298         /* None of the pathconf attributes are mandatory to implement */
3299         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3300                 memset(pathconf, 0, sizeof(*pathconf));
3301                 return 0;
3302         }
3303
3304         nfs_fattr_init(pathconf->fattr);
3305         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3306 }
3307
3308 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3309                 struct nfs_pathconf *pathconf)
3310 {
3311         struct nfs4_exception exception = { };
3312         int err;
3313
3314         do {
3315                 err = nfs4_handle_exception(server,
3316                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3317                                 &exception);
3318         } while (exception.retry);
3319         return err;
3320 }
3321
3322 void __nfs4_read_done_cb(struct nfs_read_data *data)
3323 {
3324         nfs_invalidate_atime(data->header->inode);
3325 }
3326
3327 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3328 {
3329         struct nfs_server *server = NFS_SERVER(data->header->inode);
3330
3331         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3332                 rpc_restart_call_prepare(task);
3333                 return -EAGAIN;
3334         }
3335
3336         __nfs4_read_done_cb(data);
3337         if (task->tk_status > 0)
3338                 renew_lease(server, data->timestamp);
3339         return 0;
3340 }
3341
3342 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3343 {
3344
3345         dprintk("--> %s\n", __func__);
3346
3347         if (!nfs4_sequence_done(task, &data->res.seq_res))
3348                 return -EAGAIN;
3349
3350         return data->read_done_cb ? data->read_done_cb(task, data) :
3351                                     nfs4_read_done_cb(task, data);
3352 }
3353
3354 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3355 {
3356         data->timestamp   = jiffies;
3357         data->read_done_cb = nfs4_read_done_cb;
3358         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3359         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3360 }
3361
3362 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3363 {
3364         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3365                                 &data->args.seq_args,
3366                                 &data->res.seq_res,
3367                                 task))
3368                 return;
3369         rpc_call_start(task);
3370 }
3371
3372 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3373 {
3374         struct inode *inode = data->header->inode;
3375
3376         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3377                 rpc_restart_call_prepare(task);
3378                 return -EAGAIN;
3379         }
3380         if (task->tk_status >= 0) {
3381                 renew_lease(NFS_SERVER(inode), data->timestamp);
3382                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3383         }
3384         return 0;
3385 }
3386
3387 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3388 {
3389         if (!nfs4_sequence_done(task, &data->res.seq_res))
3390                 return -EAGAIN;
3391         return data->write_done_cb ? data->write_done_cb(task, data) :
3392                 nfs4_write_done_cb(task, data);
3393 }
3394
3395 static
3396 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3397 {
3398         const struct nfs_pgio_header *hdr = data->header;
3399
3400         /* Don't request attributes for pNFS or O_DIRECT writes */
3401         if (data->ds_clp != NULL || hdr->dreq != NULL)
3402                 return false;
3403         /* Otherwise, request attributes if and only if we don't hold
3404          * a delegation
3405          */
3406         return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3407 }
3408
3409 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3410 {
3411         struct nfs_server *server = NFS_SERVER(data->header->inode);
3412
3413         if (!nfs4_write_need_cache_consistency_data(data)) {
3414                 data->args.bitmask = NULL;
3415                 data->res.fattr = NULL;
3416         } else
3417                 data->args.bitmask = server->cache_consistency_bitmask;
3418
3419         if (!data->write_done_cb)
3420                 data->write_done_cb = nfs4_write_done_cb;
3421         data->res.server = server;
3422         data->timestamp   = jiffies;
3423
3424         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3425         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3426 }
3427
3428 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3429 {
3430         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3431                                 &data->args.seq_args,
3432                                 &data->res.seq_res,
3433                                 task))
3434                 return;
3435         rpc_call_start(task);
3436 }
3437
3438 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3439 {
3440         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3441                                 &data->args.seq_args,
3442                                 &data->res.seq_res,
3443                                 task))
3444                 return;
3445         rpc_call_start(task);
3446 }
3447
3448 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3449 {
3450         struct inode *inode = data->inode;
3451
3452         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3453                 rpc_restart_call_prepare(task);
3454                 return -EAGAIN;
3455         }
3456         return 0;
3457 }
3458
3459 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3460 {
3461         if (!nfs4_sequence_done(task, &data->res.seq_res))
3462                 return -EAGAIN;
3463         return data->commit_done_cb(task, data);
3464 }
3465
3466 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3467 {
3468         struct nfs_server *server = NFS_SERVER(data->inode);
3469
3470         if (data->commit_done_cb == NULL)
3471                 data->commit_done_cb = nfs4_commit_done_cb;
3472         data->res.server = server;
3473         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3474         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3475 }
3476
3477 struct nfs4_renewdata {
3478         struct nfs_client       *client;
3479         unsigned long           timestamp;
3480 };
3481
3482 /*
3483  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3484  * standalone procedure for queueing an asynchronous RENEW.
3485  */
3486 static void nfs4_renew_release(void *calldata)
3487 {
3488         struct nfs4_renewdata *data = calldata;
3489         struct nfs_client *clp = data->client;
3490
3491         if (atomic_read(&clp->cl_count) > 1)
3492                 nfs4_schedule_state_renewal(clp);
3493         nfs_put_client(clp);
3494         kfree(data);
3495 }
3496
3497 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3498 {
3499         struct nfs4_renewdata *data = calldata;
3500         struct nfs_client *clp = data->client;
3501         unsigned long timestamp = data->timestamp;
3502
3503         if (task->tk_status < 0) {
3504                 /* Unless we're shutting down, schedule state recovery! */
3505                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3506                         return;
3507                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3508                         nfs4_schedule_lease_recovery(clp);
3509                         return;
3510                 }
3511                 nfs4_schedule_path_down_recovery(clp);
3512         }
3513         do_renew_lease(clp, timestamp);
3514 }
3515
3516 static const struct rpc_call_ops nfs4_renew_ops = {
3517         .rpc_call_done = nfs4_renew_done,
3518         .rpc_release = nfs4_renew_release,
3519 };
3520
3521 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3522 {
3523         struct rpc_message msg = {
3524                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3525                 .rpc_argp       = clp,
3526                 .rpc_cred       = cred,
3527         };
3528         struct nfs4_renewdata *data;
3529
3530         if (renew_flags == 0)
3531                 return 0;
3532         if (!atomic_inc_not_zero(&clp->cl_count))
3533                 return -EIO;
3534         data = kmalloc(sizeof(*data), GFP_NOFS);
3535         if (data == NULL)
3536                 return -ENOMEM;
3537         data->client = clp;
3538         data->timestamp = jiffies;
3539         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3540                         &nfs4_renew_ops, data);
3541 }
3542
3543 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3544 {
3545         struct rpc_message msg = {
3546                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3547                 .rpc_argp       = clp,
3548                 .rpc_cred       = cred,
3549         };
3550         unsigned long now = jiffies;
3551         int status;
3552
3553         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3554         if (status < 0)
3555                 return status;
3556         do_renew_lease(clp, now);
3557         return 0;
3558 }
3559
3560 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3561 {
3562         return (server->caps & NFS_CAP_ACLS)
3563                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3564                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3565 }
3566
3567 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3568  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3569  * the stack.
3570  */
3571 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3572
3573 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3574                 struct page **pages, unsigned int *pgbase)
3575 {
3576         struct page *newpage, **spages;
3577         int rc = 0;
3578         size_t len;
3579         spages = pages;
3580
3581         do {
3582                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3583                 newpage = alloc_page(GFP_KERNEL);
3584
3585                 if (newpage == NULL)
3586                         goto unwind;
3587                 memcpy(page_address(newpage), buf, len);
3588                 buf += len;
3589                 buflen -= len;
3590                 *pages++ = newpage;
3591                 rc++;
3592         } while (buflen != 0);
3593
3594         return rc;
3595
3596 unwind:
3597         for(; rc > 0; rc--)
3598                 __free_page(spages[rc-1]);
3599         return -ENOMEM;
3600 }
3601
3602 struct nfs4_cached_acl {
3603         int cached;
3604         size_t len;
3605         char data[0];
3606 };
3607
3608 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3609 {
3610         struct nfs_inode *nfsi = NFS_I(inode);
3611
3612         spin_lock(&inode->i_lock);
3613         kfree(nfsi->nfs4_acl);
3614         nfsi->nfs4_acl = acl;
3615         spin_unlock(&inode->i_lock);
3616 }
3617
3618 static void nfs4_zap_acl_attr(struct inode *inode)
3619 {
3620         nfs4_set_cached_acl(inode, NULL);
3621 }
3622
3623 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3624 {
3625         struct nfs_inode *nfsi = NFS_I(inode);
3626         struct nfs4_cached_acl *acl;
3627         int ret = -ENOENT;
3628
3629         spin_lock(&inode->i_lock);
3630         acl = nfsi->nfs4_acl;
3631         if (acl == NULL)
3632                 goto out;
3633         if (buf == NULL) /* user is just asking for length */
3634                 goto out_len;
3635         if (acl->cached == 0)
3636                 goto out;
3637         ret = -ERANGE; /* see getxattr(2) man page */
3638         if (acl->len > buflen)
3639                 goto out;
3640         memcpy(buf, acl->data, acl->len);
3641 out_len:
3642         ret = acl->len;
3643 out:
3644         spin_unlock(&inode->i_lock);
3645         return ret;
3646 }
3647
3648 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3649 {
3650         struct nfs4_cached_acl *acl;
3651
3652         if (pages && acl_len <= PAGE_SIZE) {
3653                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3654                 if (acl == NULL)
3655                         goto out;
3656                 acl->cached = 1;
3657                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3658         } else {
3659                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3660                 if (acl == NULL)
3661                         goto out;
3662                 acl->cached = 0;
3663         }
3664         acl->len = acl_len;
3665 out:
3666         nfs4_set_cached_acl(inode, acl);
3667 }
3668
3669 /*
3670  * The getxattr API returns the required buffer length when called with a
3671  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3672  * the required buf.  On a NULL buf, we send a page of data to the server
3673  * guessing that the ACL request can be serviced by a page. If so, we cache
3674  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3675  * the cache. If not so, we throw away the page, and cache the required
3676  * length. The next getxattr call will then produce another round trip to
3677  * the server, this time with the input buf of the required size.
3678  */
3679 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3680 {
3681         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3682         struct nfs_getaclargs args = {
3683                 .fh = NFS_FH(inode),
3684                 .acl_pages = pages,
3685                 .acl_len = buflen,
3686         };
3687         struct nfs_getaclres res = {
3688                 .acl_len = buflen,
3689         };
3690         struct rpc_message msg = {
3691                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3692                 .rpc_argp = &args,
3693                 .rpc_resp = &res,
3694         };
3695         int ret = -ENOMEM, npages, i, acl_len = 0;
3696
3697         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3698         /* As long as we're doing a round trip to the server anyway,
3699          * let's be prepared for a page of acl data. */
3700         if (npages == 0)
3701                 npages = 1;
3702
3703         /* Add an extra page to handle the bitmap returned */
3704         npages++;
3705
3706         for (i = 0; i < npages; i++) {
3707                 pages[i] = alloc_page(GFP_KERNEL);
3708                 if (!pages[i])
3709                         goto out_free;
3710         }
3711
3712         /* for decoding across pages */
3713         res.acl_scratch = alloc_page(GFP_KERNEL);
3714         if (!res.acl_scratch)
3715                 goto out_free;
3716
3717         args.acl_len = npages * PAGE_SIZE;
3718         args.acl_pgbase = 0;
3719
3720         /* Let decode_getfacl know not to fail if the ACL data is larger than
3721          * the page we send as a guess */
3722         if (buf == NULL)
3723                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3724
3725         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3726                 __func__, buf, buflen, npages, args.acl_len);
3727         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3728                              &msg, &args.seq_args, &res.seq_res, 0);
3729         if (ret)
3730                 goto out_free;
3731
3732         acl_len = res.acl_len - res.acl_data_offset;
3733         if (acl_len > args.acl_len)
3734                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3735         else
3736                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3737                                       acl_len);
3738         if (buf) {
3739                 ret = -ERANGE;
3740                 if (acl_len > buflen)
3741                         goto out_free;
3742                 _copy_from_pages(buf, pages, res.acl_data_offset,
3743                                 acl_len);
3744         }
3745         ret = acl_len;
3746 out_free:
3747         for (i = 0; i < npages; i++)
3748                 if (pages[i])
3749                         __free_page(pages[i]);
3750         if (res.acl_scratch)
3751                 __free_page(res.acl_scratch);
3752         return ret;
3753 }
3754
3755 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3756 {
3757         struct nfs4_exception exception = { };
3758         ssize_t ret;
3759         do {
3760                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3761                 if (ret >= 0)
3762                         break;
3763                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3764         } while (exception.retry);
3765         return ret;
3766 }
3767
3768 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3769 {
3770         struct nfs_server *server = NFS_SERVER(inode);
3771         int ret;
3772
3773         if (!nfs4_server_supports_acls(server))
3774                 return -EOPNOTSUPP;
3775         ret = nfs_revalidate_inode(server, inode);
3776         if (ret < 0)
3777                 return ret;
3778         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3779                 nfs_zap_acl_cache(inode);
3780         ret = nfs4_read_cached_acl(inode, buf, buflen);
3781         if (ret != -ENOENT)
3782                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3783                  * but no cached acl data, just the acl length */
3784                 return ret;
3785         return nfs4_get_acl_uncached(inode, buf, buflen);
3786 }
3787
3788 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3789 {
3790         struct nfs_server *server = NFS_SERVER(inode);
3791         struct page *pages[NFS4ACL_MAXPAGES];
3792         struct nfs_setaclargs arg = {
3793                 .fh             = NFS_FH(inode),
3794                 .acl_pages      = pages,
3795                 .acl_len        = buflen,
3796         };
3797         struct nfs_setaclres res;
3798         struct rpc_message msg = {
3799                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3800                 .rpc_argp       = &arg,
3801                 .rpc_resp       = &res,
3802         };
3803         int ret, i;
3804
3805         if (!nfs4_server_supports_acls(server))
3806                 return -EOPNOTSUPP;
3807         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3808         if (i < 0)
3809                 return i;
3810         nfs_inode_return_delegation(inode);
3811         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3812
3813         /*
3814          * Free each page after tx, so the only ref left is
3815          * held by the network stack
3816          */
3817         for (; i > 0; i--)
3818                 put_page(pages[i-1]);
3819
3820         /*
3821          * Acl update can result in inode attribute update.
3822          * so mark the attribute cache invalid.
3823          */
3824         spin_lock(&inode->i_lock);
3825         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3826         spin_unlock(&inode->i_lock);
3827         nfs_access_zap_cache(inode);
3828         nfs_zap_acl_cache(inode);
3829         return ret;
3830 }
3831
3832 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3833 {
3834         struct nfs4_exception exception = { };
3835         int err;
3836         do {
3837                 err = nfs4_handle_exception(NFS_SERVER(inode),
3838                                 __nfs4_proc_set_acl(inode, buf, buflen),
3839                                 &exception);
3840         } while (exception.retry);
3841         return err;
3842 }
3843
3844 static int
3845 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3846 {
3847         struct nfs_client *clp = server->nfs_client;
3848
3849         if (task->tk_status >= 0)
3850                 return 0;
3851         switch(task->tk_status) {
3852                 case -NFS4ERR_DELEG_REVOKED:
3853                 case -NFS4ERR_ADMIN_REVOKED:
3854                 case -NFS4ERR_BAD_STATEID:
3855                         if (state == NULL)
3856                                 break;
3857                         nfs_remove_bad_delegation(state->inode);
3858                 case -NFS4ERR_OPENMODE:
3859                         if (state == NULL)
3860                                 break;
3861                         nfs4_schedule_stateid_recovery(server, state);
3862                         goto wait_on_recovery;
3863                 case -NFS4ERR_EXPIRED:
3864                         if (state != NULL)
3865                                 nfs4_schedule_stateid_recovery(server, state);
3866                 case -NFS4ERR_STALE_STATEID:
3867                 case -NFS4ERR_STALE_CLIENTID:
3868                         nfs4_schedule_lease_recovery(clp);
3869                         goto wait_on_recovery;
3870 #if defined(CONFIG_NFS_V4_1)
3871                 case -NFS4ERR_BADSESSION:
3872                 case -NFS4ERR_BADSLOT:
3873                 case -NFS4ERR_BAD_HIGH_SLOT:
3874                 case -NFS4ERR_DEADSESSION:
3875                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3876                 case -NFS4ERR_SEQ_FALSE_RETRY:
3877                 case -NFS4ERR_SEQ_MISORDERED:
3878                         dprintk("%s ERROR %d, Reset session\n", __func__,
3879                                 task->tk_status);
3880                         nfs4_schedule_session_recovery(clp->cl_session);
3881                         task->tk_status = 0;
3882                         return -EAGAIN;
3883 #endif /* CONFIG_NFS_V4_1 */
3884                 case -NFS4ERR_DELAY:
3885                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3886                 case -NFS4ERR_GRACE:
3887                 case -EKEYEXPIRED:
3888                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3889                         task->tk_status = 0;
3890                         return -EAGAIN;
3891                 case -NFS4ERR_RETRY_UNCACHED_REP:
3892                 case -NFS4ERR_OLD_STATEID:
3893                         task->tk_status = 0;
3894                         return -EAGAIN;
3895         }
3896         task->tk_status = nfs4_map_errors(task->tk_status);
3897         return 0;
3898 wait_on_recovery:
3899         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3900         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3901                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3902         task->tk_status = 0;
3903         return -EAGAIN;
3904 }
3905
3906 static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3907                                          nfs4_verifier *bootverf)
3908 {
3909         __be32 verf[2];
3910
3911         verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3912         verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3913         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3914 }
3915
3916 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3917                 unsigned short port, struct rpc_cred *cred,
3918                 struct nfs4_setclientid_res *res)
3919 {
3920         nfs4_verifier sc_verifier;
3921         struct nfs4_setclientid setclientid = {
3922                 .sc_verifier = &sc_verifier,
3923                 .sc_prog = program,
3924                 .sc_cb_ident = clp->cl_cb_ident,
3925         };
3926         struct rpc_message msg = {
3927                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3928                 .rpc_argp = &setclientid,
3929                 .rpc_resp = res,
3930                 .rpc_cred = cred,
3931         };
3932         int loop = 0;
3933         int status;
3934
3935         nfs4_construct_boot_verifier(clp, &sc_verifier);
3936
3937         for(;;) {
3938                 rcu_read_lock();
3939                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3940                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3941                                 clp->cl_ipaddr,
3942                                 rpc_peeraddr2str(clp->cl_rpcclient,
3943                                                         RPC_DISPLAY_ADDR),
3944                                 rpc_peeraddr2str(clp->cl_rpcclient,
3945                                                         RPC_DISPLAY_PROTO),
3946                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3947                                 clp->cl_id_uniquifier);
3948                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3949                                 sizeof(setclientid.sc_netid),
3950                                 rpc_peeraddr2str(clp->cl_rpcclient,
3951                                                         RPC_DISPLAY_NETID));
3952                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3953                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3954                                 clp->cl_ipaddr, port >> 8, port & 255);
3955                 rcu_read_unlock();
3956
3957                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3958                 if (status != -NFS4ERR_CLID_INUSE)
3959                         break;
3960                 if (loop != 0) {
3961                         ++clp->cl_id_uniquifier;
3962                         break;
3963                 }
3964                 ++loop;
3965                 ssleep(clp->cl_lease_time / HZ + 1);
3966         }
3967         return status;
3968 }
3969
3970 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3971                 struct nfs4_setclientid_res *arg,
3972                 struct rpc_cred *cred)
3973 {
3974         struct nfs_fsinfo fsinfo;
3975         struct rpc_message msg = {
3976                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3977                 .rpc_argp = arg,
3978                 .rpc_resp = &fsinfo,
3979                 .rpc_cred = cred,
3980         };
3981         unsigned long now;
3982         int status;
3983
3984         now = jiffies;
3985         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3986         if (status == 0) {
3987                 spin_lock(&clp->cl_lock);
3988                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3989                 clp->cl_last_renewal = now;
3990                 spin_unlock(&clp->cl_lock);
3991         }
3992         return status;
3993 }
3994
3995 struct nfs4_delegreturndata {
3996         struct nfs4_delegreturnargs args;
3997         struct nfs4_delegreturnres res;
3998         struct nfs_fh fh;
3999         nfs4_stateid stateid;
4000         unsigned long timestamp;
4001         struct nfs_fattr fattr;
4002         int rpc_status;
4003 };
4004
4005 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4006 {
4007         struct nfs4_delegreturndata *data = calldata;
4008
4009         if (!nfs4_sequence_done(task, &data->res.seq_res))
4010                 return;
4011
4012         switch (task->tk_status) {
4013         case -NFS4ERR_STALE_STATEID:
4014         case -NFS4ERR_EXPIRED:
4015         case 0:
4016                 renew_lease(data->res.server, data->timestamp);
4017                 break;
4018         default:
4019                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4020                                 -EAGAIN) {
4021                         rpc_restart_call_prepare(task);
4022                         return;
4023                 }
4024         }
4025         data->rpc_status = task->tk_status;
4026 }
4027
4028 static void nfs4_delegreturn_release(void *calldata)
4029 {
4030         kfree(calldata);
4031 }
4032
4033 #if defined(CONFIG_NFS_V4_1)
4034 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4035 {
4036         struct nfs4_delegreturndata *d_data;
4037
4038         d_data = (struct nfs4_delegreturndata *)data;
4039
4040         if (nfs4_setup_sequence(d_data->res.server,
4041                                 &d_data->args.seq_args,
4042                                 &d_data->res.seq_res, task))
4043                 return;
4044         rpc_call_start(task);
4045 }
4046 #endif /* CONFIG_NFS_V4_1 */
4047
4048 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4049 #if defined(CONFIG_NFS_V4_1)
4050         .rpc_call_prepare = nfs4_delegreturn_prepare,
4051 #endif /* CONFIG_NFS_V4_1 */
4052         .rpc_call_done = nfs4_delegreturn_done,
4053         .rpc_release = nfs4_delegreturn_release,
4054 };
4055
4056 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4057 {
4058         struct nfs4_delegreturndata *data;
4059         struct nfs_server *server = NFS_SERVER(inode);
4060         struct rpc_task *task;
4061         struct rpc_message msg = {
4062                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4063                 .rpc_cred = cred,
4064         };
4065         struct rpc_task_setup task_setup_data = {
4066                 .rpc_client = server->client,
4067                 .rpc_message = &msg,
4068                 .callback_ops = &nfs4_delegreturn_ops,
4069                 .flags = RPC_TASK_ASYNC,
4070         };
4071         int status = 0;
4072
4073         data = kzalloc(sizeof(*data), GFP_NOFS);
4074         if (data == NULL)
4075                 return -ENOMEM;
4076         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4077         data->args.fhandle = &data->fh;
4078         data->args.stateid = &data->stateid;
4079         data->args.bitmask = server->cache_consistency_bitmask;
4080         nfs_copy_fh(&data->fh, NFS_FH(inode));
4081         nfs4_stateid_copy(&data->stateid, stateid);
4082         data->res.fattr = &data->fattr;
4083         data->res.server = server;
4084         nfs_fattr_init(data->res.fattr);
4085         data->timestamp = jiffies;
4086         data->rpc_status = 0;
4087
4088         task_setup_data.callback_data = data;
4089         msg.rpc_argp = &data->args;
4090         msg.rpc_resp = &data->res;
4091         task = rpc_run_task(&task_setup_data);
4092         if (IS_ERR(task))
4093                 return PTR_ERR(task);
4094         if (!issync)
4095                 goto out;
4096         status = nfs4_wait_for_completion_rpc_task(task);
4097         if (status != 0)
4098                 goto out;
4099         status = data->rpc_status;
4100         if (status == 0)
4101                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4102         else
4103                 nfs_refresh_inode(inode, &data->fattr);
4104 out:
4105         rpc_put_task(task);
4106         return status;
4107 }
4108
4109 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4110 {
4111         struct nfs_server *server = NFS_SERVER(inode);
4112         struct nfs4_exception exception = { };
4113         int err;
4114         do {
4115                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4116                 switch (err) {
4117                         case -NFS4ERR_STALE_STATEID:
4118                         case -NFS4ERR_EXPIRED:
4119                         case 0:
4120                                 return 0;
4121                 }
4122                 err = nfs4_handle_exception(server, err, &exception);
4123         } while (exception.retry);
4124         return err;
4125 }
4126
4127 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4128 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4129
4130 /*
4131  * sleep, with exponential backoff, and retry the LOCK operation.
4132  */
4133 static unsigned long
4134 nfs4_set_lock_task_retry(unsigned long timeout)
4135 {
4136         freezable_schedule_timeout_killable(timeout);
4137         timeout <<= 1;
4138         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4139                 return NFS4_LOCK_MAXTIMEOUT;
4140         return timeout;
4141 }
4142
4143 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4144 {
4145         struct inode *inode = state->inode;
4146         struct nfs_server *server = NFS_SERVER(inode);
4147         struct nfs_client *clp = server->nfs_client;
4148         struct nfs_lockt_args arg = {
4149                 .fh = NFS_FH(inode),
4150                 .fl = request,
4151         };
4152         struct nfs_lockt_res res = {
4153                 .denied = request,
4154         };
4155         struct rpc_message msg = {
4156                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4157                 .rpc_argp       = &arg,
4158                 .rpc_resp       = &res,
4159                 .rpc_cred       = state->owner->so_cred,
4160         };
4161         struct nfs4_lock_state *lsp;
4162         int status;
4163
4164         arg.lock_owner.clientid = clp->cl_clientid;
4165         status = nfs4_set_lock_state(state, request);
4166         if (status != 0)
4167                 goto out;
4168         lsp = request->fl_u.nfs4_fl.owner;
4169         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4170         arg.lock_owner.s_dev = server->s_dev;
4171         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4172         switch (status) {
4173                 case 0:
4174                         request->fl_type = F_UNLCK;
4175                         break;
4176                 case -NFS4ERR_DENIED:
4177                         status = 0;
4178         }
4179         request->fl_ops->fl_release_private(request);
4180 out:
4181         return status;
4182 }
4183
4184 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4185 {
4186         struct nfs4_exception exception = { };
4187         int err;
4188
4189         do {
4190                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4191                                 _nfs4_proc_getlk(state, cmd, request),
4192                                 &exception);
4193         } while (exception.retry);
4194         return err;
4195 }
4196
4197 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4198 {
4199         int res = 0;
4200         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4201                 case FL_POSIX:
4202                         res = posix_lock_file_wait(file, fl);
4203                         break;
4204                 case FL_FLOCK:
4205                         res = flock_lock_file_wait(file, fl);
4206                         break;
4207                 default:
4208                         BUG();
4209         }
4210         return res;
4211 }
4212
4213 struct nfs4_unlockdata {
4214         struct nfs_locku_args arg;
4215         struct nfs_locku_res res;
4216         struct nfs4_lock_state *lsp;
4217         struct nfs_open_context *ctx;
4218         struct file_lock fl;
4219         const struct nfs_server *server;
4220         unsigned long timestamp;
4221 };
4222
4223 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4224                 struct nfs_open_context *ctx,
4225                 struct nfs4_lock_state *lsp,
4226                 struct nfs_seqid *seqid)
4227 {
4228         struct nfs4_unlockdata *p;
4229         struct inode *inode = lsp->ls_state->inode;
4230
4231         p = kzalloc(sizeof(*p), GFP_NOFS);
4232         if (p == NULL)
4233                 return NULL;
4234         p->arg.fh = NFS_FH(inode);
4235         p->arg.fl = &p->fl;
4236         p->arg.seqid = seqid;
4237         p->res.seqid = seqid;
4238         p->arg.stateid = &lsp->ls_stateid;
4239         p->lsp = lsp;
4240         atomic_inc(&lsp->ls_count);
4241         /* Ensure we don't close file until we're done freeing locks! */
4242         p->ctx = get_nfs_open_context(ctx);
4243         memcpy(&p->fl, fl, sizeof(p->fl));
4244         p->server = NFS_SERVER(inode);
4245         return p;
4246 }
4247
4248 static void nfs4_locku_release_calldata(void *data)
4249 {
4250         struct nfs4_unlockdata *calldata = data;
4251         nfs_free_seqid(calldata->arg.seqid);
4252         nfs4_put_lock_state(calldata->lsp);
4253         put_nfs_open_context(calldata->ctx);
4254         kfree(calldata);
4255 }
4256
4257 static void nfs4_locku_done(struct rpc_task *task, void *data)
4258 {
4259         struct nfs4_unlockdata *calldata = data;
4260
4261         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4262                 return;
4263         switch (task->tk_status) {
4264                 case 0:
4265                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4266                                         &calldata->res.stateid);
4267                         renew_lease(calldata->server, calldata->timestamp);
4268                         break;
4269                 case -NFS4ERR_BAD_STATEID:
4270                 case -NFS4ERR_OLD_STATEID:
4271                 case -NFS4ERR_STALE_STATEID:
4272                 case -NFS4ERR_EXPIRED:
4273                         break;
4274                 default:
4275                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4276                                 rpc_restart_call_prepare(task);
4277         }
4278 }
4279
4280 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4281 {
4282         struct nfs4_unlockdata *calldata = data;
4283
4284         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4285                 return;
4286         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4287                 /* Note: exit _without_ running nfs4_locku_done */
4288                 task->tk_action = NULL;
4289                 return;
4290         }
4291         calldata->timestamp = jiffies;
4292         if (nfs4_setup_sequence(calldata->server,
4293                                 &calldata->arg.seq_args,
4294                                 &calldata->res.seq_res, task))
4295                 return;
4296         rpc_call_start(task);
4297 }
4298
4299 static const struct rpc_call_ops nfs4_locku_ops = {
4300         .rpc_call_prepare = nfs4_locku_prepare,
4301         .rpc_call_done = nfs4_locku_done,
4302         .rpc_release = nfs4_locku_release_calldata,
4303 };
4304
4305 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4306                 struct nfs_open_context *ctx,
4307                 struct nfs4_lock_state *lsp,
4308                 struct nfs_seqid *seqid)
4309 {
4310         struct nfs4_unlockdata *data;
4311         struct rpc_message msg = {
4312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4313                 .rpc_cred = ctx->cred,
4314         };
4315         struct rpc_task_setup task_setup_data = {
4316                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4317                 .rpc_message = &msg,
4318                 .callback_ops = &nfs4_locku_ops,
4319                 .workqueue = nfsiod_workqueue,
4320                 .flags = RPC_TASK_ASYNC,
4321         };
4322
4323         /* Ensure this is an unlock - when canceling a lock, the
4324          * canceled lock is passed in, and it won't be an unlock.
4325          */
4326         fl->fl_type = F_UNLCK;
4327
4328         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4329         if (data == NULL) {
4330                 nfs_free_seqid(seqid);
4331                 return ERR_PTR(-ENOMEM);
4332         }
4333
4334         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4335         msg.rpc_argp = &data->arg;
4336         msg.rpc_resp = &data->res;
4337         task_setup_data.callback_data = data;
4338         return rpc_run_task(&task_setup_data);
4339 }
4340
4341 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4342 {
4343         struct nfs_inode *nfsi = NFS_I(state->inode);
4344         struct nfs_seqid *seqid;
4345         struct nfs4_lock_state *lsp;
4346         struct rpc_task *task;
4347         int status = 0;
4348         unsigned char fl_flags = request->fl_flags;
4349
4350         status = nfs4_set_lock_state(state, request);
4351         /* Unlock _before_ we do the RPC call */
4352         request->fl_flags |= FL_EXISTS;
4353         down_read(&nfsi->rwsem);
4354         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4355                 up_read(&nfsi->rwsem);
4356                 goto out;
4357         }
4358         up_read(&nfsi->rwsem);
4359         if (status != 0)
4360                 goto out;
4361         /* Is this a delegated lock? */
4362         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4363                 goto out;
4364         lsp = request->fl_u.nfs4_fl.owner;
4365         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4366         status = -ENOMEM;
4367         if (seqid == NULL)
4368                 goto out;
4369         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4370         status = PTR_ERR(task);
4371         if (IS_ERR(task))
4372                 goto out;
4373         status = nfs4_wait_for_completion_rpc_task(task);
4374         rpc_put_task(task);
4375 out:
4376         request->fl_flags = fl_flags;
4377         return status;
4378 }
4379
4380 struct nfs4_lockdata {
4381         struct nfs_lock_args arg;
4382         struct nfs_lock_res res;
4383         struct nfs4_lock_state *lsp;
4384         struct nfs_open_context *ctx;
4385         struct file_lock fl;
4386         unsigned long timestamp;
4387         int rpc_status;
4388         int cancelled;
4389         struct nfs_server *server;
4390 };
4391
4392 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4393                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4394                 gfp_t gfp_mask)
4395 {
4396         struct nfs4_lockdata *p;
4397         struct inode *inode = lsp->ls_state->inode;
4398         struct nfs_server *server = NFS_SERVER(inode);
4399
4400         p = kzalloc(sizeof(*p), gfp_mask);
4401         if (p == NULL)
4402                 return NULL;
4403
4404         p->arg.fh = NFS_FH(inode);
4405         p->arg.fl = &p->fl;
4406         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4407         if (p->arg.open_seqid == NULL)
4408                 goto out_free;
4409         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4410         if (p->arg.lock_seqid == NULL)
4411                 goto out_free_seqid;
4412         p->arg.lock_stateid = &lsp->ls_stateid;
4413         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4414         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4415         p->arg.lock_owner.s_dev = server->s_dev;
4416         p->res.lock_seqid = p->arg.lock_seqid;
4417         p->lsp = lsp;
4418         p->server = server;
4419         atomic_inc(&lsp->ls_count);
4420         p->ctx = get_nfs_open_context(ctx);
4421         memcpy(&p->fl, fl, sizeof(p->fl));
4422         return p;
4423 out_free_seqid:
4424         nfs_free_seqid(p->arg.open_seqid);
4425 out_free:
4426         kfree(p);
4427         return NULL;
4428 }
4429
4430 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4431 {
4432         struct nfs4_lockdata *data = calldata;
4433         struct nfs4_state *state = data->lsp->ls_state;
4434
4435         dprintk("%s: begin!\n", __func__);
4436         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4437                 return;
4438         /* Do we need to do an open_to_lock_owner? */
4439         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4440                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4441                         return;
4442                 data->arg.open_stateid = &state->stateid;
4443                 data->arg.new_lock_owner = 1;
4444                 data->res.open_seqid = data->arg.open_seqid;
4445         } else
4446                 data->arg.new_lock_owner = 0;
4447         data->timestamp = jiffies;
4448         if (nfs4_setup_sequence(data->server,
4449                                 &data->arg.seq_args,
4450                                 &data->res.seq_res, task))
4451                 return;
4452         rpc_call_start(task);
4453         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4454 }
4455
4456 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4457 {
4458         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4459         nfs4_lock_prepare(task, calldata);
4460 }
4461
4462 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4463 {
4464         struct nfs4_lockdata *data = calldata;
4465
4466         dprintk("%s: begin!\n", __func__);
4467
4468         if (!nfs4_sequence_done(task, &data->res.seq_res))
4469                 return;
4470
4471         data->rpc_status = task->tk_status;
4472         if (data->arg.new_lock_owner != 0) {
4473                 if (data->rpc_status == 0)
4474                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4475                 else
4476                         goto out;
4477         }
4478         if (data->rpc_status == 0) {
4479                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4480                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4481                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4482         }
4483 out:
4484         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4485 }
4486
4487 static void nfs4_lock_release(void *calldata)
4488 {
4489         struct nfs4_lockdata *data = calldata;
4490
4491         dprintk("%s: begin!\n", __func__);
4492         nfs_free_seqid(data->arg.open_seqid);
4493         if (data->cancelled != 0) {
4494                 struct rpc_task *task;
4495                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4496                                 data->arg.lock_seqid);
4497                 if (!IS_ERR(task))
4498                         rpc_put_task_async(task);
4499                 dprintk("%s: cancelling lock!\n", __func__);
4500         } else
4501                 nfs_free_seqid(data->arg.lock_seqid);
4502         nfs4_put_lock_state(data->lsp);
4503         put_nfs_open_context(data->ctx);
4504         kfree(data);
4505         dprintk("%s: done!\n", __func__);
4506 }
4507
4508 static const struct rpc_call_ops nfs4_lock_ops = {
4509         .rpc_call_prepare = nfs4_lock_prepare,
4510         .rpc_call_done = nfs4_lock_done,
4511         .rpc_release = nfs4_lock_release,
4512 };
4513
4514 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4515         .rpc_call_prepare = nfs4_recover_lock_prepare,
4516         .rpc_call_done = nfs4_lock_done,
4517         .rpc_release = nfs4_lock_release,
4518 };
4519
4520 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4521 {
4522         switch (error) {
4523         case -NFS4ERR_ADMIN_REVOKED:
4524         case -NFS4ERR_BAD_STATEID:
4525                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4526                 if (new_lock_owner != 0 ||
4527                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4528                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4529                 break;
4530         case -NFS4ERR_STALE_STATEID:
4531                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4532         case -NFS4ERR_EXPIRED:
4533                 nfs4_schedule_lease_recovery(server->nfs_client);
4534         };
4535 }
4536
4537 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4538 {
4539         struct nfs4_lockdata *data;
4540         struct rpc_task *task;
4541         struct rpc_message msg = {
4542                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4543                 .rpc_cred = state->owner->so_cred,
4544         };
4545         struct rpc_task_setup task_setup_data = {
4546                 .rpc_client = NFS_CLIENT(state->inode),
4547                 .rpc_message = &msg,
4548                 .callback_ops = &nfs4_lock_ops,
4549                 .workqueue = nfsiod_workqueue,
4550                 .flags = RPC_TASK_ASYNC,
4551         };
4552         int ret;
4553
4554         dprintk("%s: begin!\n", __func__);
4555         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4556                         fl->fl_u.nfs4_fl.owner,
4557                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4558         if (data == NULL)
4559                 return -ENOMEM;
4560         if (IS_SETLKW(cmd))
4561                 data->arg.block = 1;
4562         if (recovery_type > NFS_LOCK_NEW) {
4563                 if (recovery_type == NFS_LOCK_RECLAIM)
4564                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4565                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4566         }
4567         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4568         msg.rpc_argp = &data->arg;
4569         msg.rpc_resp = &data->res;
4570         task_setup_data.callback_data = data;
4571         task = rpc_run_task(&task_setup_data);
4572         if (IS_ERR(task))
4573                 return PTR_ERR(task);
4574         ret = nfs4_wait_for_completion_rpc_task(task);
4575         if (ret == 0) {
4576                 ret = data->rpc_status;
4577                 if (ret)
4578                         nfs4_handle_setlk_error(data->server, data->lsp,
4579                                         data->arg.new_lock_owner, ret);
4580         } else
4581                 data->cancelled = 1;
4582         rpc_put_task(task);
4583         dprintk("%s: done, ret = %d!\n", __func__, ret);
4584         return ret;
4585 }
4586
4587 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4588 {
4589         struct nfs_server *server = NFS_SERVER(state->inode);
4590         struct nfs4_exception exception = {
4591                 .inode = state->inode,
4592         };
4593         int err;
4594
4595         do {
4596                 /* Cache the lock if possible... */
4597                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4598                         return 0;
4599                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4600                 if (err != -NFS4ERR_DELAY)
4601                         break;
4602                 nfs4_handle_exception(server, err, &exception);
4603         } while (exception.retry);
4604         return err;
4605 }
4606
4607 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4608 {
4609         struct nfs_server *server = NFS_SERVER(state->inode);
4610         struct nfs4_exception exception = {
4611                 .inode = state->inode,
4612         };
4613         int err;
4614
4615         err = nfs4_set_lock_state(state, request);
4616         if (err != 0)
4617                 return err;
4618         do {
4619                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4620                         return 0;
4621                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4622                 switch (err) {
4623                 default:
4624                         goto out;
4625                 case -NFS4ERR_GRACE:
4626                 case -NFS4ERR_DELAY:
4627                         nfs4_handle_exception(server, err, &exception);
4628                         err = 0;
4629                 }
4630         } while (exception.retry);
4631 out:
4632         return err;
4633 }
4634
4635 #if defined(CONFIG_NFS_V4_1)
4636 static int nfs41_check_expired_locks(struct nfs4_state *state)
4637 {
4638         int status, ret = NFS_OK;
4639         struct nfs4_lock_state *lsp;
4640         struct nfs_server *server = NFS_SERVER(state->inode);
4641
4642         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4643                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4644                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4645                         if (status != NFS_OK) {
4646                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4647                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4648                                 ret = status;
4649                         }
4650                 }
4651         };
4652
4653         return ret;
4654 }
4655
4656 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4657 {
4658         int status = NFS_OK;
4659
4660         if (test_bit(LK_STATE_IN_USE, &state->flags))
4661                 status = nfs41_check_expired_locks(state);
4662         if (status == NFS_OK)
4663                 return status;
4664         return nfs4_lock_expired(state, request);
4665 }
4666 #endif
4667
4668 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4669 {
4670         struct nfs_inode *nfsi = NFS_I(state->inode);
4671         unsigned char fl_flags = request->fl_flags;
4672         int status = -ENOLCK;
4673
4674         if ((fl_flags & FL_POSIX) &&
4675                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4676                 goto out;
4677         /* Is this a delegated open? */
4678         status = nfs4_set_lock_state(state, request);
4679         if (status != 0)
4680                 goto out;
4681         request->fl_flags |= FL_ACCESS;
4682         status = do_vfs_lock(request->fl_file, request);
4683         if (status < 0)
4684                 goto out;
4685         down_read(&nfsi->rwsem);
4686         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4687                 /* Yes: cache locks! */
4688                 /* ...but avoid races with delegation recall... */
4689                 request->fl_flags = fl_flags & ~FL_SLEEP;
4690                 status = do_vfs_lock(request->fl_file, request);
4691                 goto out_unlock;
4692         }
4693         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4694         if (status != 0)
4695                 goto out_unlock;
4696         /* Note: we always want to sleep here! */
4697         request->fl_flags = fl_flags | FL_SLEEP;
4698         if (do_vfs_lock(request->fl_file, request) < 0)
4699                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4700                         "manager!\n", __func__);
4701 out_unlock:
4702         up_read(&nfsi->rwsem);
4703 out:
4704         request->fl_flags = fl_flags;
4705         return status;
4706 }
4707
4708 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4709 {
4710         struct nfs4_exception exception = {
4711                 .state = state,
4712                 .inode = state->inode,
4713         };
4714         int err;
4715
4716         do {
4717                 err = _nfs4_proc_setlk(state, cmd, request);
4718                 if (err == -NFS4ERR_DENIED)
4719                         err = -EAGAIN;
4720                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4721                                 err, &exception);
4722         } while (exception.retry);
4723         return err;
4724 }
4725
4726 static int
4727 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4728 {
4729         struct nfs_open_context *ctx;
4730         struct nfs4_state *state;
4731         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4732         int status;
4733
4734         /* verify open state */
4735         ctx = nfs_file_open_context(filp);
4736         state = ctx->state;
4737
4738         if (request->fl_start < 0 || request->fl_end < 0)
4739                 return -EINVAL;
4740
4741         if (IS_GETLK(cmd)) {
4742                 if (state != NULL)
4743                         return nfs4_proc_getlk(state, F_GETLK, request);
4744                 return 0;
4745         }
4746
4747         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4748                 return -EINVAL;
4749
4750         if (request->fl_type == F_UNLCK) {
4751                 if (state != NULL)
4752                         return nfs4_proc_unlck(state, cmd, request);
4753                 return 0;
4754         }
4755
4756         if (state == NULL)
4757                 return -ENOLCK;
4758         /*
4759          * Don't rely on the VFS having checked the file open mode,
4760          * since it won't do this for flock() locks.
4761          */
4762         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4763         case F_RDLCK:
4764                 if (!(filp->f_mode & FMODE_READ))
4765                         return -EBADF;
4766                 break;
4767         case F_WRLCK:
4768                 if (!(filp->f_mode & FMODE_WRITE))
4769                         return -EBADF;
4770         }
4771
4772         do {
4773                 status = nfs4_proc_setlk(state, cmd, request);
4774                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4775                         break;
4776                 timeout = nfs4_set_lock_task_retry(timeout);
4777                 status = -ERESTARTSYS;
4778                 if (signalled())
4779                         break;
4780         } while(status < 0);
4781         return status;
4782 }
4783
4784 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4785 {
4786         struct nfs_server *server = NFS_SERVER(state->inode);
4787         struct nfs4_exception exception = { };
4788         int err;
4789
4790         err = nfs4_set_lock_state(state, fl);
4791         if (err != 0)
4792                 goto out;
4793         do {
4794                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4795                 switch (err) {
4796                         default:
4797                                 printk(KERN_ERR "NFS: %s: unhandled error "
4798                                         "%d.\n", __func__, err);
4799                         case 0:
4800                         case -ESTALE:
4801                                 goto out;
4802                         case -NFS4ERR_EXPIRED:
4803                                 nfs4_schedule_stateid_recovery(server, state);
4804                         case -NFS4ERR_STALE_CLIENTID:
4805                         case -NFS4ERR_STALE_STATEID:
4806                                 nfs4_schedule_lease_recovery(server->nfs_client);
4807                                 goto out;
4808                         case -NFS4ERR_BADSESSION:
4809                         case -NFS4ERR_BADSLOT:
4810                         case -NFS4ERR_BAD_HIGH_SLOT:
4811                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4812                         case -NFS4ERR_DEADSESSION:
4813                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4814                                 goto out;
4815                         case -ERESTARTSYS:
4816                                 /*
4817                                  * The show must go on: exit, but mark the
4818                                  * stateid as needing recovery.
4819                                  */
4820                         case -NFS4ERR_DELEG_REVOKED:
4821                         case -NFS4ERR_ADMIN_REVOKED:
4822                         case -NFS4ERR_BAD_STATEID:
4823                         case -NFS4ERR_OPENMODE:
4824                                 nfs4_schedule_stateid_recovery(server, state);
4825                                 err = 0;
4826                                 goto out;
4827                         case -EKEYEXPIRED:
4828                                 /*
4829                                  * User RPCSEC_GSS context has expired.
4830                                  * We cannot recover this stateid now, so
4831                                  * skip it and allow recovery thread to
4832                                  * proceed.
4833                                  */
4834                                 err = 0;
4835                                 goto out;
4836                         case -ENOMEM:
4837                         case -NFS4ERR_DENIED:
4838                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4839                                 err = 0;
4840                                 goto out;
4841                         case -NFS4ERR_DELAY:
4842                                 break;
4843                 }
4844                 err = nfs4_handle_exception(server, err, &exception);
4845         } while (exception.retry);
4846 out:
4847         return err;
4848 }
4849
4850 struct nfs_release_lockowner_data {
4851         struct nfs4_lock_state *lsp;
4852         struct nfs_server *server;
4853         struct nfs_release_lockowner_args args;
4854 };
4855
4856 static void nfs4_release_lockowner_release(void *calldata)
4857 {
4858         struct nfs_release_lockowner_data *data = calldata;
4859         nfs4_free_lock_state(data->server, data->lsp);
4860         kfree(calldata);
4861 }
4862
4863 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4864         .rpc_release = nfs4_release_lockowner_release,
4865 };
4866
4867 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4868 {
4869         struct nfs_server *server = lsp->ls_state->owner->so_server;
4870         struct nfs_release_lockowner_data *data;
4871         struct rpc_message msg = {
4872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4873         };
4874
4875         if (server->nfs_client->cl_mvops->minor_version != 0)
4876                 return -EINVAL;
4877         data = kmalloc(sizeof(*data), GFP_NOFS);
4878         if (!data)
4879                 return -ENOMEM;
4880         data->lsp = lsp;
4881         data->server = server;
4882         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4883         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4884         data->args.lock_owner.s_dev = server->s_dev;
4885         msg.rpc_argp = &data->args;
4886         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4887         return 0;
4888 }
4889
4890 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4891
4892 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4893                                    const void *buf, size_t buflen,
4894                                    int flags, int type)
4895 {
4896         if (strcmp(key, "") != 0)
4897                 return -EINVAL;
4898
4899         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4900 }
4901
4902 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4903                                    void *buf, size_t buflen, int type)
4904 {
4905         if (strcmp(key, "") != 0)
4906                 return -EINVAL;
4907
4908         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4909 }
4910
4911 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4912                                        size_t list_len, const char *name,
4913                                        size_t name_len, int type)
4914 {
4915         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4916
4917         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4918                 return 0;
4919
4920         if (list && len <= list_len)
4921                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4922         return len;
4923 }
4924
4925 /*
4926  * nfs_fhget will use either the mounted_on_fileid or the fileid
4927  */
4928 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4929 {
4930         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4931                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4932               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4933               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4934                 return;
4935
4936         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4937                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4938         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4939         fattr->nlink = 2;
4940 }
4941
4942 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4943                                    const struct qstr *name,
4944                                    struct nfs4_fs_locations *fs_locations,
4945                                    struct page *page)
4946 {
4947         struct nfs_server *server = NFS_SERVER(dir);
4948         u32 bitmask[2] = {
4949                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4950         };
4951         struct nfs4_fs_locations_arg args = {
4952                 .dir_fh = NFS_FH(dir),
4953                 .name = name,
4954                 .page = page,
4955                 .bitmask = bitmask,
4956         };
4957         struct nfs4_fs_locations_res res = {
4958                 .fs_locations = fs_locations,
4959         };
4960         struct rpc_message msg = {
4961                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4962                 .rpc_argp = &args,
4963                 .rpc_resp = &res,
4964         };
4965         int status;
4966
4967         dprintk("%s: start\n", __func__);
4968
4969         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4970          * is not supported */
4971         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4972                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4973         else
4974                 bitmask[0] |= FATTR4_WORD0_FILEID;
4975
4976         nfs_fattr_init(&fs_locations->fattr);
4977         fs_locations->server = server;
4978         fs_locations->nlocations = 0;
4979         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
4980         dprintk("%s: returned status = %d\n", __func__, status);
4981         return status;
4982 }
4983
4984 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4985                            const struct qstr *name,
4986                            struct nfs4_fs_locations *fs_locations,
4987                            struct page *page)
4988 {
4989         struct nfs4_exception exception = { };
4990         int err;
4991         do {
4992                 err = nfs4_handle_exception(NFS_SERVER(dir),
4993                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
4994                                 &exception);
4995         } while (exception.retry);
4996         return err;
4997 }
4998
4999 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5000 {
5001         int status;
5002         struct nfs4_secinfo_arg args = {
5003                 .dir_fh = NFS_FH(dir),
5004                 .name   = name,
5005         };
5006         struct nfs4_secinfo_res res = {
5007                 .flavors     = flavors,
5008         };
5009         struct rpc_message msg = {
5010                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5011                 .rpc_argp = &args,
5012                 .rpc_resp = &res,
5013         };
5014
5015         dprintk("NFS call  secinfo %s\n", name->name);
5016         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5017         dprintk("NFS reply  secinfo: %d\n", status);
5018         return status;
5019 }
5020
5021 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5022                       struct nfs4_secinfo_flavors *flavors)
5023 {
5024         struct nfs4_exception exception = { };
5025         int err;
5026         do {
5027                 err = nfs4_handle_exception(NFS_SERVER(dir),
5028                                 _nfs4_proc_secinfo(dir, name, flavors),
5029                                 &exception);
5030         } while (exception.retry);
5031         return err;
5032 }
5033
5034 #ifdef CONFIG_NFS_V4_1
5035 /*
5036  * Check the exchange flags returned by the server for invalid flags, having
5037  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5038  * DS flags set.
5039  */
5040 static int nfs4_check_cl_exchange_flags(u32 flags)
5041 {
5042         if (flags & ~EXCHGID4_FLAG_MASK_R)
5043                 goto out_inval;
5044         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5045             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5046                 goto out_inval;
5047         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5048                 goto out_inval;
5049         return NFS_OK;
5050 out_inval:
5051         return -NFS4ERR_INVAL;
5052 }
5053
5054 static bool
5055 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5056 {
5057         if (a->server_scope_sz == b->server_scope_sz &&
5058             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5059                 return true;
5060
5061         return false;
5062 }
5063
5064 /*
5065  * nfs4_proc_exchange_id()
5066  *
5067  * Since the clientid has expired, all compounds using sessions
5068  * associated with the stale clientid will be returning
5069  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5070  * be in some phase of session reset.
5071  */
5072 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5073 {
5074         nfs4_verifier verifier;
5075         struct nfs41_exchange_id_args args = {
5076                 .verifier = &verifier,
5077                 .client = clp,
5078                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5079         };
5080         struct nfs41_exchange_id_res res = {
5081                 .client = clp,
5082         };
5083         int status;
5084         struct rpc_message msg = {
5085                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5086                 .rpc_argp = &args,
5087                 .rpc_resp = &res,
5088                 .rpc_cred = cred,
5089         };
5090
5091         dprintk("--> %s\n", __func__);
5092         BUG_ON(clp == NULL);
5093
5094         nfs4_construct_boot_verifier(clp, &verifier);
5095
5096         args.id_len = scnprintf(args.id, sizeof(args.id),
5097                                 "%s/%s/%u",
5098                                 clp->cl_ipaddr,
5099                                 clp->cl_rpcclient->cl_nodename,
5100                                 clp->cl_rpcclient->cl_auth->au_flavor);
5101
5102         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5103         if (unlikely(!res.server_scope)) {
5104                 status = -ENOMEM;
5105                 goto out;
5106         }
5107
5108         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5109         if (unlikely(!res.impl_id)) {
5110                 status = -ENOMEM;
5111                 goto out_server_scope;
5112         }
5113
5114         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5115         if (!status)
5116                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5117
5118         if (!status) {
5119                 /* use the most recent implementation id */
5120                 kfree(clp->impl_id);
5121                 clp->impl_id = res.impl_id;
5122         } else
5123                 kfree(res.impl_id);
5124
5125         if (!status) {
5126                 if (clp->server_scope &&
5127                     !nfs41_same_server_scope(clp->server_scope,
5128                                              res.server_scope)) {
5129                         dprintk("%s: server_scope mismatch detected\n",
5130                                 __func__);
5131                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5132                         kfree(clp->server_scope);
5133                         clp->server_scope = NULL;
5134                 }
5135
5136                 if (!clp->server_scope) {
5137                         clp->server_scope = res.server_scope;
5138                         goto out;
5139                 }
5140         }
5141
5142 out_server_scope:
5143         kfree(res.server_scope);
5144 out:
5145         if (clp->impl_id)
5146                 dprintk("%s: Server Implementation ID: "
5147                         "domain: %s, name: %s, date: %llu,%u\n",
5148                         __func__, clp->impl_id->domain, clp->impl_id->name,
5149                         clp->impl_id->date.seconds,
5150                         clp->impl_id->date.nseconds);
5151         dprintk("<-- %s status= %d\n", __func__, status);
5152         return status;
5153 }
5154
5155 struct nfs4_get_lease_time_data {
5156         struct nfs4_get_lease_time_args *args;
5157         struct nfs4_get_lease_time_res *res;
5158         struct nfs_client *clp;
5159 };
5160
5161 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5162                                         void *calldata)
5163 {
5164         int ret;
5165         struct nfs4_get_lease_time_data *data =
5166                         (struct nfs4_get_lease_time_data *)calldata;
5167
5168         dprintk("--> %s\n", __func__);
5169         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5170         /* just setup sequence, do not trigger session recovery
5171            since we're invoked within one */
5172         ret = nfs41_setup_sequence(data->clp->cl_session,
5173                                    &data->args->la_seq_args,
5174                                    &data->res->lr_seq_res, task);
5175
5176         BUG_ON(ret == -EAGAIN);
5177         rpc_call_start(task);
5178         dprintk("<-- %s\n", __func__);
5179 }
5180
5181 /*
5182  * Called from nfs4_state_manager thread for session setup, so don't recover
5183  * from sequence operation or clientid errors.
5184  */
5185 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5186 {
5187         struct nfs4_get_lease_time_data *data =
5188                         (struct nfs4_get_lease_time_data *)calldata;
5189
5190         dprintk("--> %s\n", __func__);
5191         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5192                 return;
5193         switch (task->tk_status) {
5194         case -NFS4ERR_DELAY:
5195         case -NFS4ERR_GRACE:
5196                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5197                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5198                 task->tk_status = 0;
5199                 /* fall through */
5200         case -NFS4ERR_RETRY_UNCACHED_REP:
5201                 rpc_restart_call_prepare(task);
5202                 return;
5203         }
5204         dprintk("<-- %s\n", __func__);
5205 }
5206
5207 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5208         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5209         .rpc_call_done = nfs4_get_lease_time_done,
5210 };
5211
5212 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5213 {
5214         struct rpc_task *task;
5215         struct nfs4_get_lease_time_args args;
5216         struct nfs4_get_lease_time_res res = {
5217                 .lr_fsinfo = fsinfo,
5218         };
5219         struct nfs4_get_lease_time_data data = {
5220                 .args = &args,
5221                 .res = &res,
5222                 .clp = clp,
5223         };
5224         struct rpc_message msg = {
5225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5226                 .rpc_argp = &args,
5227                 .rpc_resp = &res,
5228         };
5229         struct rpc_task_setup task_setup = {
5230                 .rpc_client = clp->cl_rpcclient,
5231                 .rpc_message = &msg,
5232                 .callback_ops = &nfs4_get_lease_time_ops,
5233                 .callback_data = &data,
5234                 .flags = RPC_TASK_TIMEOUT,
5235         };
5236         int status;
5237
5238         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5239         dprintk("--> %s\n", __func__);
5240         task = rpc_run_task(&task_setup);
5241
5242         if (IS_ERR(task))
5243                 status = PTR_ERR(task);
5244         else {
5245                 status = task->tk_status;
5246                 rpc_put_task(task);
5247         }
5248         dprintk("<-- %s return %d\n", __func__, status);
5249
5250         return status;
5251 }
5252
5253 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5254 {
5255         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5256 }
5257
5258 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5259                 struct nfs4_slot *new,
5260                 u32 max_slots,
5261                 u32 ivalue)
5262 {
5263         struct nfs4_slot *old = NULL;
5264         u32 i;
5265
5266         spin_lock(&tbl->slot_tbl_lock);
5267         if (new) {
5268                 old = tbl->slots;
5269                 tbl->slots = new;
5270                 tbl->max_slots = max_slots;
5271         }
5272         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5273         for (i = 0; i < tbl->max_slots; i++)
5274                 tbl->slots[i].seq_nr = ivalue;
5275         spin_unlock(&tbl->slot_tbl_lock);
5276         kfree(old);
5277 }
5278
5279 /*
5280  * (re)Initialise a slot table
5281  */
5282 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5283                                  u32 ivalue)
5284 {
5285         struct nfs4_slot *new = NULL;
5286         int ret = -ENOMEM;
5287
5288         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5289                 max_reqs, tbl->max_slots);
5290
5291         /* Does the newly negotiated max_reqs match the existing slot table? */
5292         if (max_reqs != tbl->max_slots) {
5293                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5294                 if (!new)
5295                         goto out;
5296         }
5297         ret = 0;
5298
5299         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5300         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5301                 tbl, tbl->slots, tbl->max_slots);
5302 out:
5303         dprintk("<-- %s: return %d\n", __func__, ret);
5304         return ret;
5305 }
5306
5307 /* Destroy the slot table */
5308 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5309 {
5310         if (session->fc_slot_table.slots != NULL) {
5311                 kfree(session->fc_slot_table.slots);
5312                 session->fc_slot_table.slots = NULL;
5313         }
5314         if (session->bc_slot_table.slots != NULL) {
5315                 kfree(session->bc_slot_table.slots);
5316                 session->bc_slot_table.slots = NULL;
5317         }
5318         return;
5319 }
5320
5321 /*
5322  * Initialize or reset the forechannel and backchannel tables
5323  */
5324 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5325 {
5326         struct nfs4_slot_table *tbl;
5327         int status;
5328
5329         dprintk("--> %s\n", __func__);
5330         /* Fore channel */
5331         tbl = &ses->fc_slot_table;
5332         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5333         if (status) /* -ENOMEM */
5334                 return status;
5335         /* Back channel */
5336         tbl = &ses->bc_slot_table;
5337         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5338         if (status && tbl->slots == NULL)
5339                 /* Fore and back channel share a connection so get
5340                  * both slot tables or neither */
5341                 nfs4_destroy_slot_tables(ses);
5342         return status;
5343 }
5344
5345 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5346 {
5347         struct nfs4_session *session;
5348         struct nfs4_slot_table *tbl;
5349
5350         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5351         if (!session)
5352                 return NULL;
5353
5354         tbl = &session->fc_slot_table;
5355         tbl->highest_used_slotid = NFS4_NO_SLOT;
5356         spin_lock_init(&tbl->slot_tbl_lock);
5357         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5358         init_completion(&tbl->complete);
5359
5360         tbl = &session->bc_slot_table;
5361         tbl->highest_used_slotid = NFS4_NO_SLOT;
5362         spin_lock_init(&tbl->slot_tbl_lock);
5363         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5364         init_completion(&tbl->complete);
5365
5366         session->session_state = 1<<NFS4_SESSION_INITING;
5367
5368         session->clp = clp;
5369         return session;
5370 }
5371
5372 void nfs4_destroy_session(struct nfs4_session *session)
5373 {
5374         struct rpc_xprt *xprt;
5375
5376         nfs4_proc_destroy_session(session);
5377
5378         rcu_read_lock();
5379         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5380         rcu_read_unlock();
5381         dprintk("%s Destroy backchannel for xprt %p\n",
5382                 __func__, xprt);
5383         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5384         nfs4_destroy_slot_tables(session);
5385         kfree(session);
5386 }
5387
5388 /*
5389  * Initialize the values to be used by the client in CREATE_SESSION
5390  * If nfs4_init_session set the fore channel request and response sizes,
5391  * use them.
5392  *
5393  * Set the back channel max_resp_sz_cached to zero to force the client to
5394  * always set csa_cachethis to FALSE because the current implementation
5395  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5396  */
5397 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5398 {
5399         struct nfs4_session *session = args->client->cl_session;
5400         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5401                      mxresp_sz = session->fc_attrs.max_resp_sz;
5402
5403         if (mxrqst_sz == 0)
5404                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5405         if (mxresp_sz == 0)
5406                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5407         /* Fore channel attributes */
5408         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5409         args->fc_attrs.max_resp_sz = mxresp_sz;
5410         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5411         args->fc_attrs.max_reqs = max_session_slots;
5412
5413         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5414                 "max_ops=%u max_reqs=%u\n",
5415                 __func__,
5416                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5417                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5418
5419         /* Back channel attributes */
5420         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5421         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5422         args->bc_attrs.max_resp_sz_cached = 0;
5423         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5424         args->bc_attrs.max_reqs = 1;
5425
5426         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5427                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5428                 __func__,
5429                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5430                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5431                 args->bc_attrs.max_reqs);
5432 }
5433
5434 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5435 {
5436         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5437         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5438
5439         if (rcvd->max_resp_sz > sent->max_resp_sz)
5440                 return -EINVAL;
5441         /*
5442          * Our requested max_ops is the minimum we need; we're not
5443          * prepared to break up compounds into smaller pieces than that.
5444          * So, no point even trying to continue if the server won't
5445          * cooperate:
5446          */
5447         if (rcvd->max_ops < sent->max_ops)
5448                 return -EINVAL;
5449         if (rcvd->max_reqs == 0)
5450                 return -EINVAL;
5451         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5452                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5453         return 0;
5454 }
5455
5456 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5457 {
5458         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5459         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5460
5461         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5462                 return -EINVAL;
5463         if (rcvd->max_resp_sz < sent->max_resp_sz)
5464                 return -EINVAL;
5465         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5466                 return -EINVAL;
5467         /* These would render the backchannel useless: */
5468         if (rcvd->max_ops != sent->max_ops)
5469                 return -EINVAL;
5470         if (rcvd->max_reqs != sent->max_reqs)
5471                 return -EINVAL;
5472         return 0;
5473 }
5474
5475 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5476                                      struct nfs4_session *session)
5477 {
5478         int ret;
5479
5480         ret = nfs4_verify_fore_channel_attrs(args, session);
5481         if (ret)
5482                 return ret;
5483         return nfs4_verify_back_channel_attrs(args, session);
5484 }
5485
5486 static int _nfs4_proc_create_session(struct nfs_client *clp)
5487 {
5488         struct nfs4_session *session = clp->cl_session;
5489         struct nfs41_create_session_args args = {
5490                 .client = clp,
5491                 .cb_program = NFS4_CALLBACK,
5492         };
5493         struct nfs41_create_session_res res = {
5494                 .client = clp,
5495         };
5496         struct rpc_message msg = {
5497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5498                 .rpc_argp = &args,
5499                 .rpc_resp = &res,
5500         };
5501         int status;
5502
5503         nfs4_init_channel_attrs(&args);
5504         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5505
5506         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5507
5508         if (!status)
5509                 /* Verify the session's negotiated channel_attrs values */
5510                 status = nfs4_verify_channel_attrs(&args, session);
5511         if (!status) {
5512                 /* Increment the clientid slot sequence id */
5513                 clp->cl_seqid++;
5514         }
5515
5516         return status;
5517 }
5518
5519 /*
5520  * Issues a CREATE_SESSION operation to the server.
5521  * It is the responsibility of the caller to verify the session is
5522  * expired before calling this routine.
5523  */
5524 int nfs4_proc_create_session(struct nfs_client *clp)
5525 {
5526         int status;
5527         unsigned *ptr;
5528         struct nfs4_session *session = clp->cl_session;
5529
5530         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5531
5532         status = _nfs4_proc_create_session(clp);
5533         if (status)
5534                 goto out;
5535
5536         /* Init or reset the session slot tables */
5537         status = nfs4_setup_session_slot_tables(session);
5538         dprintk("slot table setup returned %d\n", status);
5539         if (status)
5540                 goto out;
5541
5542         ptr = (unsigned *)&session->sess_id.data[0];
5543         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5544                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5545 out:
5546         dprintk("<-- %s\n", __func__);
5547         return status;
5548 }
5549
5550 /*
5551  * Issue the over-the-wire RPC DESTROY_SESSION.
5552  * The caller must serialize access to this routine.
5553  */
5554 int nfs4_proc_destroy_session(struct nfs4_session *session)
5555 {
5556         int status = 0;
5557         struct rpc_message msg;
5558
5559         dprintk("--> nfs4_proc_destroy_session\n");
5560
5561         /* session is still being setup */
5562         if (session->clp->cl_cons_state != NFS_CS_READY)
5563                 return status;
5564
5565         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5566         msg.rpc_argp = session;
5567         msg.rpc_resp = NULL;
5568         msg.rpc_cred = NULL;
5569         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5570
5571         if (status)
5572                 printk(KERN_WARNING
5573                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5574                         "Session has been destroyed regardless...\n", status);
5575
5576         dprintk("<-- nfs4_proc_destroy_session\n");
5577         return status;
5578 }
5579
5580 int nfs4_init_session(struct nfs_server *server)
5581 {
5582         struct nfs_client *clp = server->nfs_client;
5583         struct nfs4_session *session;
5584         unsigned int rsize, wsize;
5585         int ret;
5586
5587         if (!nfs4_has_session(clp))
5588                 return 0;
5589
5590         session = clp->cl_session;
5591         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5592                 return 0;
5593
5594         rsize = server->rsize;
5595         if (rsize == 0)
5596                 rsize = NFS_MAX_FILE_IO_SIZE;
5597         wsize = server->wsize;
5598         if (wsize == 0)
5599                 wsize = NFS_MAX_FILE_IO_SIZE;
5600
5601         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5602         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5603
5604         ret = nfs4_recover_expired_lease(server);
5605         if (!ret)
5606                 ret = nfs4_check_client_ready(clp);
5607         return ret;
5608 }
5609
5610 int nfs4_init_ds_session(struct nfs_client *clp)
5611 {
5612         struct nfs4_session *session = clp->cl_session;
5613         int ret;
5614
5615         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5616                 return 0;
5617
5618         ret = nfs4_client_recover_expired_lease(clp);
5619         if (!ret)
5620                 /* Test for the DS role */
5621                 if (!is_ds_client(clp))
5622                         ret = -ENODEV;
5623         if (!ret)
5624                 ret = nfs4_check_client_ready(clp);
5625         return ret;
5626
5627 }
5628 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5629
5630
5631 /*
5632  * Renew the cl_session lease.
5633  */
5634 struct nfs4_sequence_data {
5635         struct nfs_client *clp;
5636         struct nfs4_sequence_args args;
5637         struct nfs4_sequence_res res;
5638 };
5639
5640 static void nfs41_sequence_release(void *data)
5641 {
5642         struct nfs4_sequence_data *calldata = data;
5643         struct nfs_client *clp = calldata->clp;
5644
5645         if (atomic_read(&clp->cl_count) > 1)
5646                 nfs4_schedule_state_renewal(clp);
5647         nfs_put_client(clp);
5648         kfree(calldata);
5649 }
5650
5651 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5652 {
5653         switch(task->tk_status) {
5654         case -NFS4ERR_DELAY:
5655                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5656                 return -EAGAIN;
5657         default:
5658                 nfs4_schedule_lease_recovery(clp);
5659         }
5660         return 0;
5661 }
5662
5663 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5664 {
5665         struct nfs4_sequence_data *calldata = data;
5666         struct nfs_client *clp = calldata->clp;
5667
5668         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5669                 return;
5670
5671         if (task->tk_status < 0) {
5672                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5673                 if (atomic_read(&clp->cl_count) == 1)
5674                         goto out;
5675
5676                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5677                         rpc_restart_call_prepare(task);
5678                         return;
5679                 }
5680         }
5681         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5682 out:
5683         dprintk("<-- %s\n", __func__);
5684 }
5685
5686 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5687 {
5688         struct nfs4_sequence_data *calldata = data;
5689         struct nfs_client *clp = calldata->clp;
5690         struct nfs4_sequence_args *args;
5691         struct nfs4_sequence_res *res;
5692
5693         args = task->tk_msg.rpc_argp;
5694         res = task->tk_msg.rpc_resp;
5695
5696         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5697                 return;
5698         rpc_call_start(task);
5699 }
5700
5701 static const struct rpc_call_ops nfs41_sequence_ops = {
5702         .rpc_call_done = nfs41_sequence_call_done,
5703         .rpc_call_prepare = nfs41_sequence_prepare,
5704         .rpc_release = nfs41_sequence_release,
5705 };
5706
5707 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5708 {
5709         struct nfs4_sequence_data *calldata;
5710         struct rpc_message msg = {
5711                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5712                 .rpc_cred = cred,
5713         };
5714         struct rpc_task_setup task_setup_data = {
5715                 .rpc_client = clp->cl_rpcclient,
5716                 .rpc_message = &msg,
5717                 .callback_ops = &nfs41_sequence_ops,
5718                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5719         };
5720
5721         if (!atomic_inc_not_zero(&clp->cl_count))
5722                 return ERR_PTR(-EIO);
5723         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5724         if (calldata == NULL) {
5725                 nfs_put_client(clp);
5726                 return ERR_PTR(-ENOMEM);
5727         }
5728         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5729         msg.rpc_argp = &calldata->args;
5730         msg.rpc_resp = &calldata->res;
5731         calldata->clp = clp;
5732         task_setup_data.callback_data = calldata;
5733
5734         return rpc_run_task(&task_setup_data);
5735 }
5736
5737 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5738 {
5739         struct rpc_task *task;
5740         int ret = 0;
5741
5742         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5743                 return 0;
5744         task = _nfs41_proc_sequence(clp, cred);
5745         if (IS_ERR(task))
5746                 ret = PTR_ERR(task);
5747         else
5748                 rpc_put_task_async(task);
5749         dprintk("<-- %s status=%d\n", __func__, ret);
5750         return ret;
5751 }
5752
5753 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5754 {
5755         struct rpc_task *task;
5756         int ret;
5757
5758         task = _nfs41_proc_sequence(clp, cred);
5759         if (IS_ERR(task)) {
5760                 ret = PTR_ERR(task);
5761                 goto out;
5762         }
5763         ret = rpc_wait_for_completion_task(task);
5764         if (!ret) {
5765                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5766
5767                 if (task->tk_status == 0)
5768                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5769                 ret = task->tk_status;
5770         }
5771         rpc_put_task(task);
5772 out:
5773         dprintk("<-- %s status=%d\n", __func__, ret);
5774         return ret;
5775 }
5776
5777 struct nfs4_reclaim_complete_data {
5778         struct nfs_client *clp;
5779         struct nfs41_reclaim_complete_args arg;
5780         struct nfs41_reclaim_complete_res res;
5781 };
5782
5783 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5784 {
5785         struct nfs4_reclaim_complete_data *calldata = data;
5786
5787         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5788         if (nfs41_setup_sequence(calldata->clp->cl_session,
5789                                 &calldata->arg.seq_args,
5790                                 &calldata->res.seq_res, task))
5791                 return;
5792
5793         rpc_call_start(task);
5794 }
5795
5796 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5797 {
5798         switch(task->tk_status) {
5799         case 0:
5800         case -NFS4ERR_COMPLETE_ALREADY:
5801         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5802                 break;
5803         case -NFS4ERR_DELAY:
5804                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5805                 /* fall through */
5806         case -NFS4ERR_RETRY_UNCACHED_REP:
5807                 return -EAGAIN;
5808         default:
5809                 nfs4_schedule_lease_recovery(clp);
5810         }
5811         return 0;
5812 }
5813
5814 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5815 {
5816         struct nfs4_reclaim_complete_data *calldata = data;
5817         struct nfs_client *clp = calldata->clp;
5818         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5819
5820         dprintk("--> %s\n", __func__);
5821         if (!nfs41_sequence_done(task, res))
5822                 return;
5823
5824         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5825                 rpc_restart_call_prepare(task);
5826                 return;
5827         }
5828         dprintk("<-- %s\n", __func__);
5829 }
5830
5831 static void nfs4_free_reclaim_complete_data(void *data)
5832 {
5833         struct nfs4_reclaim_complete_data *calldata = data;
5834
5835         kfree(calldata);
5836 }
5837
5838 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5839         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5840         .rpc_call_done = nfs4_reclaim_complete_done,
5841         .rpc_release = nfs4_free_reclaim_complete_data,
5842 };
5843
5844 /*
5845  * Issue a global reclaim complete.
5846  */
5847 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5848 {
5849         struct nfs4_reclaim_complete_data *calldata;
5850         struct rpc_task *task;
5851         struct rpc_message msg = {
5852                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5853         };
5854         struct rpc_task_setup task_setup_data = {
5855                 .rpc_client = clp->cl_rpcclient,
5856                 .rpc_message = &msg,
5857                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5858                 .flags = RPC_TASK_ASYNC,
5859         };
5860         int status = -ENOMEM;
5861
5862         dprintk("--> %s\n", __func__);
5863         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5864         if (calldata == NULL)
5865                 goto out;
5866         calldata->clp = clp;
5867         calldata->arg.one_fs = 0;
5868
5869         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5870         msg.rpc_argp = &calldata->arg;
5871         msg.rpc_resp = &calldata->res;
5872         task_setup_data.callback_data = calldata;
5873         task = rpc_run_task(&task_setup_data);
5874         if (IS_ERR(task)) {
5875                 status = PTR_ERR(task);
5876                 goto out;
5877         }
5878         status = nfs4_wait_for_completion_rpc_task(task);
5879         if (status == 0)
5880                 status = task->tk_status;
5881         rpc_put_task(task);
5882         return 0;
5883 out:
5884         dprintk("<-- %s status=%d\n", __func__, status);
5885         return status;
5886 }
5887
5888 static void
5889 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5890 {
5891         struct nfs4_layoutget *lgp = calldata;
5892         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5893
5894         dprintk("--> %s\n", __func__);
5895         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5896          * right now covering the LAYOUTGET we are about to send.
5897          * However, that is not so catastrophic, and there seems
5898          * to be no way to prevent it completely.
5899          */
5900         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5901                                 &lgp->res.seq_res, task))
5902                 return;
5903         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5904                                           NFS_I(lgp->args.inode)->layout,
5905                                           lgp->args.ctx->state)) {
5906                 rpc_exit(task, NFS4_OK);
5907                 return;
5908         }
5909         rpc_call_start(task);
5910 }
5911
5912 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5913 {
5914         struct nfs4_layoutget *lgp = calldata;
5915         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5916
5917         dprintk("--> %s\n", __func__);
5918
5919         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5920                 return;
5921
5922         switch (task->tk_status) {
5923         case 0:
5924                 break;
5925         case -NFS4ERR_LAYOUTTRYLATER:
5926         case -NFS4ERR_RECALLCONFLICT:
5927                 task->tk_status = -NFS4ERR_DELAY;
5928                 /* Fall through */
5929         default:
5930                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5931                         rpc_restart_call_prepare(task);
5932                         return;
5933                 }
5934         }
5935         dprintk("<-- %s\n", __func__);
5936 }
5937
5938 static void nfs4_layoutget_release(void *calldata)
5939 {
5940         struct nfs4_layoutget *lgp = calldata;
5941
5942         dprintk("--> %s\n", __func__);
5943         put_nfs_open_context(lgp->args.ctx);
5944         kfree(calldata);
5945         dprintk("<-- %s\n", __func__);
5946 }
5947
5948 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5949         .rpc_call_prepare = nfs4_layoutget_prepare,
5950         .rpc_call_done = nfs4_layoutget_done,
5951         .rpc_release = nfs4_layoutget_release,
5952 };
5953
5954 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5955 {
5956         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5957         struct rpc_task *task;
5958         struct rpc_message msg = {
5959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5960                 .rpc_argp = &lgp->args,
5961                 .rpc_resp = &lgp->res,
5962         };
5963         struct rpc_task_setup task_setup_data = {
5964                 .rpc_client = server->client,
5965                 .rpc_message = &msg,
5966                 .callback_ops = &nfs4_layoutget_call_ops,
5967                 .callback_data = lgp,
5968                 .flags = RPC_TASK_ASYNC,
5969         };
5970         int status = 0;
5971
5972         dprintk("--> %s\n", __func__);
5973
5974         lgp->res.layoutp = &lgp->args.layout;
5975         lgp->res.seq_res.sr_slot = NULL;
5976         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5977         task = rpc_run_task(&task_setup_data);
5978         if (IS_ERR(task))
5979                 return PTR_ERR(task);
5980         status = nfs4_wait_for_completion_rpc_task(task);
5981         if (status == 0)
5982                 status = task->tk_status;
5983         if (status == 0)
5984                 status = pnfs_layout_process(lgp);
5985         rpc_put_task(task);
5986         dprintk("<-- %s status=%d\n", __func__, status);
5987         return status;
5988 }
5989
5990 static void
5991 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5992 {
5993         struct nfs4_layoutreturn *lrp = calldata;
5994
5995         dprintk("--> %s\n", __func__);
5996         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5997                                 &lrp->res.seq_res, task))
5998                 return;
5999         rpc_call_start(task);
6000 }
6001
6002 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6003 {
6004         struct nfs4_layoutreturn *lrp = calldata;
6005         struct nfs_server *server;
6006         struct pnfs_layout_hdr *lo = lrp->args.layout;
6007
6008         dprintk("--> %s\n", __func__);
6009
6010         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6011                 return;
6012
6013         server = NFS_SERVER(lrp->args.inode);
6014         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6015                 rpc_restart_call_prepare(task);
6016                 return;
6017         }
6018         spin_lock(&lo->plh_inode->i_lock);
6019         if (task->tk_status == 0) {
6020                 if (lrp->res.lrs_present) {
6021                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6022                 } else
6023                         BUG_ON(!list_empty(&lo->plh_segs));
6024         }
6025         lo->plh_block_lgets--;
6026         spin_unlock(&lo->plh_inode->i_lock);
6027         dprintk("<-- %s\n", __func__);
6028 }
6029
6030 static void nfs4_layoutreturn_release(void *calldata)
6031 {
6032         struct nfs4_layoutreturn *lrp = calldata;
6033
6034         dprintk("--> %s\n", __func__);
6035         put_layout_hdr(lrp->args.layout);
6036         kfree(calldata);
6037         dprintk("<-- %s\n", __func__);
6038 }
6039
6040 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6041         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6042         .rpc_call_done = nfs4_layoutreturn_done,
6043         .rpc_release = nfs4_layoutreturn_release,
6044 };
6045
6046 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6047 {
6048         struct rpc_task *task;
6049         struct rpc_message msg = {
6050                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6051                 .rpc_argp = &lrp->args,
6052                 .rpc_resp = &lrp->res,
6053         };
6054         struct rpc_task_setup task_setup_data = {
6055                 .rpc_client = lrp->clp->cl_rpcclient,
6056                 .rpc_message = &msg,
6057                 .callback_ops = &nfs4_layoutreturn_call_ops,
6058                 .callback_data = lrp,
6059         };
6060         int status;
6061
6062         dprintk("--> %s\n", __func__);
6063         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6064         task = rpc_run_task(&task_setup_data);
6065         if (IS_ERR(task))
6066                 return PTR_ERR(task);
6067         status = task->tk_status;
6068         dprintk("<-- %s status=%d\n", __func__, status);
6069         rpc_put_task(task);
6070         return status;
6071 }
6072
6073 /*
6074  * Retrieve the list of Data Server devices from the MDS.
6075  */
6076 static int _nfs4_getdevicelist(struct nfs_server *server,
6077                                     const struct nfs_fh *fh,
6078                                     struct pnfs_devicelist *devlist)
6079 {
6080         struct nfs4_getdevicelist_args args = {
6081                 .fh = fh,
6082                 .layoutclass = server->pnfs_curr_ld->id,
6083         };
6084         struct nfs4_getdevicelist_res res = {
6085                 .devlist = devlist,
6086         };
6087         struct rpc_message msg = {
6088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6089                 .rpc_argp = &args,
6090                 .rpc_resp = &res,
6091         };
6092         int status;
6093
6094         dprintk("--> %s\n", __func__);
6095         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6096                                 &res.seq_res, 0);
6097         dprintk("<-- %s status=%d\n", __func__, status);
6098         return status;
6099 }
6100
6101 int nfs4_proc_getdevicelist(struct nfs_server *server,
6102                             const struct nfs_fh *fh,
6103                             struct pnfs_devicelist *devlist)
6104 {
6105         struct nfs4_exception exception = { };
6106         int err;
6107
6108         do {
6109                 err = nfs4_handle_exception(server,
6110                                 _nfs4_getdevicelist(server, fh, devlist),
6111                                 &exception);
6112         } while (exception.retry);
6113
6114         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6115                 err, devlist->num_devs);
6116
6117         return err;
6118 }
6119 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6120
6121 static int
6122 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6123 {
6124         struct nfs4_getdeviceinfo_args args = {
6125                 .pdev = pdev,
6126         };
6127         struct nfs4_getdeviceinfo_res res = {
6128                 .pdev = pdev,
6129         };
6130         struct rpc_message msg = {
6131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6132                 .rpc_argp = &args,
6133                 .rpc_resp = &res,
6134         };
6135         int status;
6136
6137         dprintk("--> %s\n", __func__);
6138         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6139         dprintk("<-- %s status=%d\n", __func__, status);
6140
6141         return status;
6142 }
6143
6144 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6145 {
6146         struct nfs4_exception exception = { };
6147         int err;
6148
6149         do {
6150                 err = nfs4_handle_exception(server,
6151                                         _nfs4_proc_getdeviceinfo(server, pdev),
6152                                         &exception);
6153         } while (exception.retry);
6154         return err;
6155 }
6156 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6157
6158 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6159 {
6160         struct nfs4_layoutcommit_data *data = calldata;
6161         struct nfs_server *server = NFS_SERVER(data->args.inode);
6162
6163         if (nfs4_setup_sequence(server, &data->args.seq_args,
6164                                 &data->res.seq_res, task))
6165                 return;
6166         rpc_call_start(task);
6167 }
6168
6169 static void
6170 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6171 {
6172         struct nfs4_layoutcommit_data *data = calldata;
6173         struct nfs_server *server = NFS_SERVER(data->args.inode);
6174
6175         if (!nfs4_sequence_done(task, &data->res.seq_res))
6176                 return;
6177
6178         switch (task->tk_status) { /* Just ignore these failures */
6179         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6180         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6181         case -NFS4ERR_BADLAYOUT:     /* no layout */
6182         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6183                 task->tk_status = 0;
6184                 break;
6185         case 0:
6186                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6187                                                    data->res.fattr);
6188                 break;
6189         default:
6190                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6191                         rpc_restart_call_prepare(task);
6192                         return;
6193                 }
6194         }
6195 }
6196
6197 static void nfs4_layoutcommit_release(void *calldata)
6198 {
6199         struct nfs4_layoutcommit_data *data = calldata;
6200         struct pnfs_layout_segment *lseg, *tmp;
6201         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6202
6203         pnfs_cleanup_layoutcommit(data);
6204         /* Matched by references in pnfs_set_layoutcommit */
6205         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6206                 list_del_init(&lseg->pls_lc_list);
6207                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6208                                        &lseg->pls_flags))
6209                         put_lseg(lseg);
6210         }
6211
6212         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6213         smp_mb__after_clear_bit();
6214         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6215
6216         put_rpccred(data->cred);
6217         kfree(data);
6218 }
6219
6220 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6221         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6222         .rpc_call_done = nfs4_layoutcommit_done,
6223         .rpc_release = nfs4_layoutcommit_release,
6224 };
6225
6226 int
6227 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6228 {
6229         struct rpc_message msg = {
6230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6231                 .rpc_argp = &data->args,
6232                 .rpc_resp = &data->res,
6233                 .rpc_cred = data->cred,
6234         };
6235         struct rpc_task_setup task_setup_data = {
6236                 .task = &data->task,
6237                 .rpc_client = NFS_CLIENT(data->args.inode),
6238                 .rpc_message = &msg,
6239                 .callback_ops = &nfs4_layoutcommit_ops,
6240                 .callback_data = data,
6241                 .flags = RPC_TASK_ASYNC,
6242         };
6243         struct rpc_task *task;
6244         int status = 0;
6245
6246         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6247                 "lbw: %llu inode %lu\n",
6248                 data->task.tk_pid, sync,
6249                 data->args.lastbytewritten,
6250                 data->args.inode->i_ino);
6251
6252         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6253         task = rpc_run_task(&task_setup_data);
6254         if (IS_ERR(task))
6255                 return PTR_ERR(task);
6256         if (sync == false)
6257                 goto out;
6258         status = nfs4_wait_for_completion_rpc_task(task);
6259         if (status != 0)
6260                 goto out;
6261         status = task->tk_status;
6262 out:
6263         dprintk("%s: status %d\n", __func__, status);
6264         rpc_put_task(task);
6265         return status;
6266 }
6267
6268 static int
6269 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6270                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6271 {
6272         struct nfs41_secinfo_no_name_args args = {
6273                 .style = SECINFO_STYLE_CURRENT_FH,
6274         };
6275         struct nfs4_secinfo_res res = {
6276                 .flavors = flavors,
6277         };
6278         struct rpc_message msg = {
6279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6280                 .rpc_argp = &args,
6281                 .rpc_resp = &res,
6282         };
6283         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6284 }
6285
6286 static int
6287 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6288                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6289 {
6290         struct nfs4_exception exception = { };
6291         int err;
6292         do {
6293                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6294                 switch (err) {
6295                 case 0:
6296                 case -NFS4ERR_WRONGSEC:
6297                 case -NFS4ERR_NOTSUPP:
6298                         goto out;
6299                 default:
6300                         err = nfs4_handle_exception(server, err, &exception);
6301                 }
6302         } while (exception.retry);
6303 out:
6304         return err;
6305 }
6306
6307 static int
6308 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6309                     struct nfs_fsinfo *info)
6310 {
6311         int err;
6312         struct page *page;
6313         rpc_authflavor_t flavor;
6314         struct nfs4_secinfo_flavors *flavors;
6315
6316         page = alloc_page(GFP_KERNEL);
6317         if (!page) {
6318                 err = -ENOMEM;
6319                 goto out;
6320         }
6321
6322         flavors = page_address(page);
6323         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6324
6325         /*
6326          * Fall back on "guess and check" method if
6327          * the server doesn't support SECINFO_NO_NAME
6328          */
6329         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6330                 err = nfs4_find_root_sec(server, fhandle, info);
6331                 goto out_freepage;
6332         }
6333         if (err)
6334                 goto out_freepage;
6335
6336         flavor = nfs_find_best_sec(flavors);
6337         if (err == 0)
6338                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6339
6340 out_freepage:
6341         put_page(page);
6342         if (err == -EACCES)
6343                 return -EPERM;
6344 out:
6345         return err;
6346 }
6347
6348 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6349 {
6350         int status;
6351         struct nfs41_test_stateid_args args = {
6352                 .stateid = stateid,
6353         };
6354         struct nfs41_test_stateid_res res;
6355         struct rpc_message msg = {
6356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6357                 .rpc_argp = &args,
6358                 .rpc_resp = &res,
6359         };
6360
6361         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6362         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6363
6364         if (status == NFS_OK)
6365                 return res.status;
6366         return status;
6367 }
6368
6369 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6370 {
6371         struct nfs4_exception exception = { };
6372         int err;
6373         do {
6374                 err = nfs4_handle_exception(server,
6375                                 _nfs41_test_stateid(server, stateid),
6376                                 &exception);
6377         } while (exception.retry);
6378         return err;
6379 }
6380
6381 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6382 {
6383         struct nfs41_free_stateid_args args = {
6384                 .stateid = stateid,
6385         };
6386         struct nfs41_free_stateid_res res;
6387         struct rpc_message msg = {
6388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6389                 .rpc_argp = &args,
6390                 .rpc_resp = &res,
6391         };
6392
6393         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6394         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6395 }
6396
6397 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6398 {
6399         struct nfs4_exception exception = { };
6400         int err;
6401         do {
6402                 err = nfs4_handle_exception(server,
6403                                 _nfs4_free_stateid(server, stateid),
6404                                 &exception);
6405         } while (exception.retry);
6406         return err;
6407 }
6408
6409 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6410                 const nfs4_stateid *s2)
6411 {
6412         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6413                 return false;
6414
6415         if (s1->seqid == s2->seqid)
6416                 return true;
6417         if (s1->seqid == 0 || s2->seqid == 0)
6418                 return true;
6419
6420         return false;
6421 }
6422
6423 #endif /* CONFIG_NFS_V4_1 */
6424
6425 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6426                 const nfs4_stateid *s2)
6427 {
6428         return nfs4_stateid_match(s1, s2);
6429 }
6430
6431
6432 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6433         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6434         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6435         .recover_open   = nfs4_open_reclaim,
6436         .recover_lock   = nfs4_lock_reclaim,
6437         .establish_clid = nfs4_init_clientid,
6438         .get_clid_cred  = nfs4_get_setclientid_cred,
6439 };
6440
6441 #if defined(CONFIG_NFS_V4_1)
6442 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6443         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6444         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6445         .recover_open   = nfs4_open_reclaim,
6446         .recover_lock   = nfs4_lock_reclaim,
6447         .establish_clid = nfs41_init_clientid,
6448         .get_clid_cred  = nfs4_get_exchange_id_cred,
6449         .reclaim_complete = nfs41_proc_reclaim_complete,
6450 };
6451 #endif /* CONFIG_NFS_V4_1 */
6452
6453 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6454         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6455         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6456         .recover_open   = nfs4_open_expired,
6457         .recover_lock   = nfs4_lock_expired,
6458         .establish_clid = nfs4_init_clientid,
6459         .get_clid_cred  = nfs4_get_setclientid_cred,
6460 };
6461
6462 #if defined(CONFIG_NFS_V4_1)
6463 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6464         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6465         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6466         .recover_open   = nfs41_open_expired,
6467         .recover_lock   = nfs41_lock_expired,
6468         .establish_clid = nfs41_init_clientid,
6469         .get_clid_cred  = nfs4_get_exchange_id_cred,
6470 };
6471 #endif /* CONFIG_NFS_V4_1 */
6472
6473 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6474         .sched_state_renewal = nfs4_proc_async_renew,
6475         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6476         .renew_lease = nfs4_proc_renew,
6477 };
6478
6479 #if defined(CONFIG_NFS_V4_1)
6480 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6481         .sched_state_renewal = nfs41_proc_async_sequence,
6482         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6483         .renew_lease = nfs4_proc_sequence,
6484 };
6485 #endif
6486
6487 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6488         .minor_version = 0,
6489         .call_sync = _nfs4_call_sync,
6490         .match_stateid = nfs4_match_stateid,
6491         .find_root_sec = nfs4_find_root_sec,
6492         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6493         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6494         .state_renewal_ops = &nfs40_state_renewal_ops,
6495 };
6496
6497 #if defined(CONFIG_NFS_V4_1)
6498 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6499         .minor_version = 1,
6500         .call_sync = _nfs4_call_sync_session,
6501         .match_stateid = nfs41_match_stateid,
6502         .find_root_sec = nfs41_find_root_sec,
6503         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6504         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6505         .state_renewal_ops = &nfs41_state_renewal_ops,
6506 };
6507 #endif
6508
6509 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6510         [0] = &nfs_v4_0_minor_ops,
6511 #if defined(CONFIG_NFS_V4_1)
6512         [1] = &nfs_v4_1_minor_ops,
6513 #endif
6514 };
6515
6516 static const struct inode_operations nfs4_file_inode_operations = {
6517         .permission     = nfs_permission,
6518         .getattr        = nfs_getattr,
6519         .setattr        = nfs_setattr,
6520         .getxattr       = generic_getxattr,
6521         .setxattr       = generic_setxattr,
6522         .listxattr      = generic_listxattr,
6523         .removexattr    = generic_removexattr,
6524 };
6525
6526 const struct nfs_rpc_ops nfs_v4_clientops = {
6527         .version        = 4,                    /* protocol version */
6528         .dentry_ops     = &nfs4_dentry_operations,
6529         .dir_inode_ops  = &nfs4_dir_inode_operations,
6530         .file_inode_ops = &nfs4_file_inode_operations,
6531         .file_ops       = &nfs4_file_operations,
6532         .getroot        = nfs4_proc_get_root,
6533         .submount       = nfs4_submount,
6534         .getattr        = nfs4_proc_getattr,
6535         .setattr        = nfs4_proc_setattr,
6536         .lookup         = nfs4_proc_lookup,
6537         .access         = nfs4_proc_access,
6538         .readlink       = nfs4_proc_readlink,
6539         .create         = nfs4_proc_create,
6540         .remove         = nfs4_proc_remove,
6541         .unlink_setup   = nfs4_proc_unlink_setup,
6542         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6543         .unlink_done    = nfs4_proc_unlink_done,
6544         .rename         = nfs4_proc_rename,
6545         .rename_setup   = nfs4_proc_rename_setup,
6546         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6547         .rename_done    = nfs4_proc_rename_done,
6548         .link           = nfs4_proc_link,
6549         .symlink        = nfs4_proc_symlink,
6550         .mkdir          = nfs4_proc_mkdir,
6551         .rmdir          = nfs4_proc_remove,
6552         .readdir        = nfs4_proc_readdir,
6553         .mknod          = nfs4_proc_mknod,
6554         .statfs         = nfs4_proc_statfs,
6555         .fsinfo         = nfs4_proc_fsinfo,
6556         .pathconf       = nfs4_proc_pathconf,
6557         .set_capabilities = nfs4_server_capabilities,
6558         .decode_dirent  = nfs4_decode_dirent,
6559         .read_setup     = nfs4_proc_read_setup,
6560         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6561         .read_done      = nfs4_read_done,
6562         .write_setup    = nfs4_proc_write_setup,
6563         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6564         .write_done     = nfs4_write_done,
6565         .commit_setup   = nfs4_proc_commit_setup,
6566         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6567         .commit_done    = nfs4_commit_done,
6568         .lock           = nfs4_proc_lock,
6569         .clear_acl_cache = nfs4_zap_acl_attr,
6570         .close_context  = nfs4_close_context,
6571         .open_context   = nfs4_atomic_open,
6572         .init_client    = nfs4_init_client,
6573 };
6574
6575 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6576         .prefix = XATTR_NAME_NFSV4_ACL,
6577         .list   = nfs4_xattr_list_nfs4_acl,
6578         .get    = nfs4_xattr_get_nfs4_acl,
6579         .set    = nfs4_xattr_set_nfs4_acl,
6580 };
6581
6582 const struct xattr_handler *nfs4_xattr_handlers[] = {
6583         &nfs4_xattr_nfs4_acl_handler,
6584         NULL
6585 };
6586
6587 module_param(max_session_slots, ushort, 0644);
6588 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6589                 "requests the client will negotiate");
6590
6591 /*
6592  * Local variables:
6593  *  c-basic-offset: 8
6594  * End:
6595  */