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/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.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/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  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 *, long *);
  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 *, struct nfs4_label *label);
  84 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  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, struct nfs4_label *ilabel,
  88                             struct nfs4_label *olabel);
  89 #ifdef CONFIG_NFS_V4_1
  90 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  91                 struct rpc_cred *);
  92 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  93                 struct rpc_cred *);
  94 #endif
  95
  96 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  97 static inline struct nfs4_label *
  98 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  99         struct iattr *sattr, struct nfs4_label *label)
 100 {
 101         int err;
 102
 103         if (label == NULL)
 104                 return NULL;
 105
 106         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 107                 return NULL;
 108
 109         err = security_dentry_init_security(dentry, sattr->ia_mode,
 110                                 &dentry->d_name, (void **)&label->label, &label->len);
 111         if (err == 0)
 112                 return label;
 113
 114         return NULL;
 115 }
 116 static inline void
 117 nfs4_label_release_security(struct nfs4_label *label)
 118 {
 119         if (label)
 120                 security_release_secctx(label->label, label->len);
 121 }
 122 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 123 {
 124         if (label)
 125                 return server->attr_bitmask;
 126
 127         return server->attr_bitmask_nl;
 128 }
 129 #else
 130 static inline struct nfs4_label *
 131 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 132         struct iattr *sattr, struct nfs4_label *l)
 133 { return NULL; }
 134 static inline void
 135 nfs4_label_release_security(struct nfs4_label *label)
 136 { return; }
 137 static inline u32 *
 138 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 139 { return server->attr_bitmask; }
 140 #endif
 141
 142 /* Prevent leaks of NFSv4 errors into userland */
 143 static int nfs4_map_errors(int err)
 144 {
 145         if (err >= -1000)
 146                 return err;
 147         switch (err) {
 148         case -NFS4ERR_RESOURCE:
 149         case -NFS4ERR_LAYOUTTRYLATER:
 150         case -NFS4ERR_RECALLCONFLICT:
 151                 return -EREMOTEIO;
 152         case -NFS4ERR_WRONGSEC:
 153         case -NFS4ERR_WRONG_CRED:
 154                 return -EPERM;
 155         case -NFS4ERR_BADOWNER:
 156         case -NFS4ERR_BADNAME:
 157                 return -EINVAL;
 158         case -NFS4ERR_SHARE_DENIED:
 159                 return -EACCES;
 160         case -NFS4ERR_MINOR_VERS_MISMATCH:
 161                 return -EPROTONOSUPPORT;
 162         case -NFS4ERR_FILE_OPEN:
 163                 return -EBUSY;
 164         default:
 165                 dprintk("%s could not handle NFSv4 error %d\n",
 166                                 __func__, -err);
 167                 break;
 168         }
 169         return -EIO;
 170 }
 171
 172 /*
 173  * This is our standard bitmap for GETATTR requests.
 174  */
 175 const u32 nfs4_fattr_bitmap[3] = {
 176         FATTR4_WORD0_TYPE
 177         | FATTR4_WORD0_CHANGE
 178         | FATTR4_WORD0_SIZE
 179         | FATTR4_WORD0_FSID
 180         | FATTR4_WORD0_FILEID,
 181         FATTR4_WORD1_MODE
 182         | FATTR4_WORD1_NUMLINKS
 183         | FATTR4_WORD1_OWNER
 184         | FATTR4_WORD1_OWNER_GROUP
 185         | FATTR4_WORD1_RAWDEV
 186         | FATTR4_WORD1_SPACE_USED
 187         | FATTR4_WORD1_TIME_ACCESS
 188         | FATTR4_WORD1_TIME_METADATA
 189         | FATTR4_WORD1_TIME_MODIFY
 190         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 348 {
 349         struct nfs_client *clp = server->nfs_client;
 350         struct nfs4_state *state = exception->state;
 351         struct inode *inode = exception->inode;
 352         int ret = errorcode;
 353
 354         exception->retry = 0;
 355         switch(errorcode) {
 356                 case 0:
 357                         return 0;
 358                 case -NFS4ERR_OPENMODE:
 359                 case -NFS4ERR_DELEG_REVOKED:
 360                 case -NFS4ERR_ADMIN_REVOKED:
 361                 case -NFS4ERR_BAD_STATEID:
 362                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 363                                 nfs4_inode_return_delegation(inode);
 364                                 exception->retry = 1;
 365                                 return 0;
 366                         }
 367                         if (state == NULL)
 368                                 break;
 369                         ret = nfs4_schedule_stateid_recovery(server, state);
 370                         if (ret < 0)
 371                                 break;
 372                         goto wait_on_recovery;
 373                 case -NFS4ERR_EXPIRED:
 374                         if (state != NULL) {
 375                                 ret = nfs4_schedule_stateid_recovery(server, state);
 376                                 if (ret < 0)
 377                                         break;
 378                         }
 379                 case -NFS4ERR_STALE_STATEID:
 380                 case -NFS4ERR_STALE_CLIENTID:
 381                         nfs4_schedule_lease_recovery(clp);
 382                         goto wait_on_recovery;
 383                 case -NFS4ERR_MOVED:
 384                         ret = nfs4_schedule_migration_recovery(server);
 385                         if (ret < 0)
 386                                 break;
 387                         goto wait_on_recovery;
 388                 case -NFS4ERR_LEASE_MOVED:
 389                         nfs4_schedule_lease_moved_recovery(clp);
 390                         goto wait_on_recovery;
 391 #if defined(CONFIG_NFS_V4_1)
 392                 case -NFS4ERR_BADSESSION:
 393                 case -NFS4ERR_BADSLOT:
 394                 case -NFS4ERR_BAD_HIGH_SLOT:
 395                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 396                 case -NFS4ERR_DEADSESSION:
 397                 case -NFS4ERR_SEQ_FALSE_RETRY:
 398                 case -NFS4ERR_SEQ_MISORDERED:
 399                         dprintk("%s ERROR: %d Reset session\n", __func__,
 400                                 errorcode);
 401                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 402                         goto wait_on_recovery;
 403 #endif /* defined(CONFIG_NFS_V4_1) */
 404                 case -NFS4ERR_FILE_OPEN:
 405                         if (exception->timeout > HZ) {
 406                                 /* We have retried a decent amount, time to
 407                                  * fail
 408                                  */
 409                                 ret = -EBUSY;
 410                                 break;
 411                         }
 412                 case -NFS4ERR_GRACE:
 413                 case -NFS4ERR_DELAY:
 414                         ret = nfs4_delay(server->client, &exception->timeout);
 415                         if (ret != 0)
 416                                 break;
 417                 case -NFS4ERR_RETRY_UNCACHED_REP:
 418                 case -NFS4ERR_OLD_STATEID:
 419                         exception->retry = 1;
 420                         break;
 421                 case -NFS4ERR_BADOWNER:
 422                         /* The following works around a Linux server bug! */
 423                 case -NFS4ERR_BADNAME:
 424                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 425                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 426                                 exception->retry = 1;
 427                                 printk(KERN_WARNING "NFS: v4 server %s "
 428                                                 "does not accept raw "
 429                                                 "uid/gids. "
 430                                                 "Reenabling the idmapper.\n",
 431                                                 server->nfs_client->cl_hostname);
 432                         }
 433         }
 434         /* We failed to handle the error */
 435         return nfs4_map_errors(ret);
 436 wait_on_recovery:
 437         ret = nfs4_wait_clnt_recover(clp);
 438         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 439                 return -EIO;
 440         if (ret == 0)
 441                 exception->retry = 1;
 442         return ret;
 443 }
 444
 445 /*
 446  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 447  * or 'false' otherwise.
 448  */
 449 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 450 {
 451         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 452
 453         if (flavor == RPC_AUTH_GSS_KRB5I ||
 454             flavor == RPC_AUTH_GSS_KRB5P)
 455                 return true;
 456
 457         return false;
 458 }
 459
 460 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 461 {
 462         spin_lock(&clp->cl_lock);
 463         if (time_before(clp->cl_last_renewal,timestamp))
 464                 clp->cl_last_renewal = timestamp;
 465         spin_unlock(&clp->cl_lock);
 466 }
 467
 468 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 469 {
 470         struct nfs_client *clp = server->nfs_client;
 471
 472         if (!nfs4_has_session(clp))
 473                 do_renew_lease(clp, timestamp);
 474 }
 475
 476 struct nfs4_call_sync_data {
 477         const struct nfs_server *seq_server;
 478         struct nfs4_sequence_args *seq_args;
 479         struct nfs4_sequence_res *seq_res;
 480 };
 481
 482 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 483                         struct nfs4_sequence_res *res, int cache_reply)
 484 {
 485         args->sa_slot = NULL;
 486         args->sa_cache_this = cache_reply;
 487         args->sa_privileged = 0;
 488
 489         res->sr_slot = NULL;
 490 }
 491
 492 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 493 {
 494         args->sa_privileged = 1;
 495 }
 496
 497 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 498                          struct nfs4_sequence_args *args,
 499                          struct nfs4_sequence_res *res,
 500                          struct rpc_task *task)
 501 {
 502         struct nfs4_slot *slot;
 503
 504         /* slot already allocated? */
 505         if (res->sr_slot != NULL)
 506                 goto out_start;
 507
 508         spin_lock(&tbl->slot_tbl_lock);
 509         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 510                 goto out_sleep;
 511
 512         slot = nfs4_alloc_slot(tbl);
 513         if (IS_ERR(slot)) {
 514                 if (slot == ERR_PTR(-ENOMEM))
 515                         task->tk_timeout = HZ >> 2;
 516                 goto out_sleep;
 517         }
 518         spin_unlock(&tbl->slot_tbl_lock);
 519
 520         args->sa_slot = slot;
 521         res->sr_slot = slot;
 522
 523 out_start:
 524         rpc_call_start(task);
 525         return 0;
 526
 527 out_sleep:
 528         if (args->sa_privileged)
 529                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 530                                 NULL, RPC_PRIORITY_PRIVILEGED);
 531         else
 532                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 533         spin_unlock(&tbl->slot_tbl_lock);
 534         return -EAGAIN;
 535 }
 536 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 537
 538 static int nfs40_sequence_done(struct rpc_task *task,
 539                                struct nfs4_sequence_res *res)
 540 {
 541         struct nfs4_slot *slot = res->sr_slot;
 542         struct nfs4_slot_table *tbl;
 543
 544         if (slot == NULL)
 545                 goto out;
 546
 547         tbl = slot->table;
 548         spin_lock(&tbl->slot_tbl_lock);
 549         if (!nfs41_wake_and_assign_slot(tbl, slot))
 550                 nfs4_free_slot(tbl, slot);
 551         spin_unlock(&tbl->slot_tbl_lock);
 552
 553         res->sr_slot = NULL;
 554 out:
 555         return 1;
 556 }
 557
 558 #if defined(CONFIG_NFS_V4_1)
 559
 560 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 561 {
 562         struct nfs4_session *session;
 563         struct nfs4_slot_table *tbl;
 564         struct nfs4_slot *slot = res->sr_slot;
 565         bool send_new_highest_used_slotid = false;
 566
 567         tbl = slot->table;
 568         session = tbl->session;
 569
 570         spin_lock(&tbl->slot_tbl_lock);
 571         /* Be nice to the server: try to ensure that the last transmitted
 572          * value for highest_user_slotid <= target_highest_slotid
 573          */
 574         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 575                 send_new_highest_used_slotid = true;
 576
 577         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 578                 send_new_highest_used_slotid = false;
 579                 goto out_unlock;
 580         }
 581         nfs4_free_slot(tbl, slot);
 582
 583         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 584                 send_new_highest_used_slotid = false;
 585 out_unlock:
 586         spin_unlock(&tbl->slot_tbl_lock);
 587         res->sr_slot = NULL;
 588         if (send_new_highest_used_slotid)
 589                 nfs41_notify_server(session->clp);
 590 }
 591
 592 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 593 {
 594         struct nfs4_session *session;
 595         struct nfs4_slot *slot = res->sr_slot;
 596         struct nfs_client *clp;
 597         bool interrupted = false;
 598         int ret = 1;
 599
 600         if (slot == NULL)
 601                 goto out_noaction;
 602         /* don't increment the sequence number if the task wasn't sent */
 603         if (!RPC_WAS_SENT(task))
 604                 goto out;
 605
 606         session = slot->table->session;
 607
 608         if (slot->interrupted) {
 609                 slot->interrupted = 0;
 610                 interrupted = true;
 611         }
 612
 613         trace_nfs4_sequence_done(session, res);
 614         /* Check the SEQUENCE operation status */
 615         switch (res->sr_status) {
 616         case 0:
 617                 /* Update the slot's sequence and clientid lease timer */
 618                 ++slot->seq_nr;
 619                 clp = session->clp;
 620                 do_renew_lease(clp, res->sr_timestamp);
 621                 /* Check sequence flags */
 622                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 623                 nfs41_update_target_slotid(slot->table, slot, res);
 624                 break;
 625         case 1:
 626                 /*
 627                  * sr_status remains 1 if an RPC level error occurred.
 628                  * The server may or may not have processed the sequence
 629                  * operation..
 630                  * Mark the slot as having hosted an interrupted RPC call.
 631                  */
 632                 slot->interrupted = 1;
 633                 goto out;
 634         case -NFS4ERR_DELAY:
 635                 /* The server detected a resend of the RPC call and
 636                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 637                  * of RFC5661.
 638                  */
 639                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 640                         __func__,
 641                         slot->slot_nr,
 642                         slot->seq_nr);
 643                 goto out_retry;
 644         case -NFS4ERR_BADSLOT:
 645                 /*
 646                  * The slot id we used was probably retired. Try again
 647                  * using a different slot id.
 648                  */
 649                 goto retry_nowait;
 650         case -NFS4ERR_SEQ_MISORDERED:
 651                 /*
 652                  * Was the last operation on this sequence interrupted?
 653                  * If so, retry after bumping the sequence number.
 654                  */
 655                 if (interrupted) {
 656                         ++slot->seq_nr;
 657                         goto retry_nowait;
 658                 }
 659                 /*
 660                  * Could this slot have been previously retired?
 661                  * If so, then the server may be expecting seq_nr = 1!
 662                  */
 663                 if (slot->seq_nr != 1) {
 664                         slot->seq_nr = 1;
 665                         goto retry_nowait;
 666                 }
 667                 break;
 668         case -NFS4ERR_SEQ_FALSE_RETRY:
 669                 ++slot->seq_nr;
 670                 goto retry_nowait;
 671         default:
 672                 /* Just update the slot sequence no. */
 673                 ++slot->seq_nr;
 674         }
 675 out:
 676         /* The session may be reset by one of the error handlers. */
 677         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 678         nfs41_sequence_free_slot(res);
 679 out_noaction:
 680         return ret;
 681 retry_nowait:
 682         if (rpc_restart_call_prepare(task)) {
 683                 task->tk_status = 0;
 684                 ret = 0;
 685         }
 686         goto out;
 687 out_retry:
 688         if (!rpc_restart_call(task))
 689                 goto out;
 690         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 691         return 0;
 692 }
 693 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 694
 695 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 696 {
 697         if (res->sr_slot == NULL)
 698                 return 1;
 699         if (!res->sr_slot->table->session)
 700                 return nfs40_sequence_done(task, res);
 701         return nfs41_sequence_done(task, res);
 702 }
 703 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 704
 705 int nfs41_setup_sequence(struct nfs4_session *session,
 706                                 struct nfs4_sequence_args *args,
 707                                 struct nfs4_sequence_res *res,
 708                                 struct rpc_task *task)
 709 {
 710         struct nfs4_slot *slot;
 711         struct nfs4_slot_table *tbl;
 712
 713         dprintk("--> %s\n", __func__);
 714         /* slot already allocated? */
 715         if (res->sr_slot != NULL)
 716                 goto out_success;
 717
 718         tbl = &session->fc_slot_table;
 719
 720         task->tk_timeout = 0;
 721
 722         spin_lock(&tbl->slot_tbl_lock);
 723         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 724             !args->sa_privileged) {
 725                 /* The state manager will wait until the slot table is empty */
 726                 dprintk("%s session is draining\n", __func__);
 727                 goto out_sleep;
 728         }
 729
 730         slot = nfs4_alloc_slot(tbl);
 731         if (IS_ERR(slot)) {
 732                 /* If out of memory, try again in 1/4 second */
 733                 if (slot == ERR_PTR(-ENOMEM))
 734                         task->tk_timeout = HZ >> 2;
 735                 dprintk("<-- %s: no free slots\n", __func__);
 736                 goto out_sleep;
 737         }
 738         spin_unlock(&tbl->slot_tbl_lock);
 739
 740         args->sa_slot = slot;
 741
 742         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 743                         slot->slot_nr, slot->seq_nr);
 744
 745         res->sr_slot = slot;
 746         res->sr_timestamp = jiffies;
 747         res->sr_status_flags = 0;
 748         /*
 749          * sr_status is only set in decode_sequence, and so will remain
 750          * set to 1 if an rpc level failure occurs.
 751          */
 752         res->sr_status = 1;
 753         trace_nfs4_setup_sequence(session, args);
 754 out_success:
 755         rpc_call_start(task);
 756         return 0;
 757 out_sleep:
 758         /* Privileged tasks are queued with top priority */
 759         if (args->sa_privileged)
 760                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 761                                 NULL, RPC_PRIORITY_PRIVILEGED);
 762         else
 763                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 764         spin_unlock(&tbl->slot_tbl_lock);
 765         return -EAGAIN;
 766 }
 767 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 768
 769 static int nfs4_setup_sequence(const struct nfs_server *server,
 770                                struct nfs4_sequence_args *args,
 771                                struct nfs4_sequence_res *res,
 772                                struct rpc_task *task)
 773 {
 774         struct nfs4_session *session = nfs4_get_session(server);
 775         int ret = 0;
 776
 777         if (!session)
 778                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 779                                             args, res, task);
 780
 781         dprintk("--> %s clp %p session %p sr_slot %u\n",
 782                 __func__, session->clp, session, res->sr_slot ?
 783                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 784
 785         ret = nfs41_setup_sequence(session, args, res, task);
 786
 787         dprintk("<-- %s status=%d\n", __func__, ret);
 788         return ret;
 789 }
 790
 791 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 792 {
 793         struct nfs4_call_sync_data *data = calldata;
 794         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 795
 796         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 797
 798         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 799 }
 800
 801 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_call_sync_data *data = calldata;
 804
 805         nfs41_sequence_done(task, data->seq_res);
 806 }
 807
 808 static const struct rpc_call_ops nfs41_call_sync_ops = {
 809         .rpc_call_prepare = nfs41_call_sync_prepare,
 810         .rpc_call_done = nfs41_call_sync_done,
 811 };
 812
 813 #else   /* !CONFIG_NFS_V4_1 */
 814
 815 static int nfs4_setup_sequence(const struct nfs_server *server,
 816                                struct nfs4_sequence_args *args,
 817                                struct nfs4_sequence_res *res,
 818                                struct rpc_task *task)
 819 {
 820         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 821                                     args, res, task);
 822 }
 823
 824 int nfs4_sequence_done(struct rpc_task *task,
 825                        struct nfs4_sequence_res *res)
 826 {
 827         return nfs40_sequence_done(task, res);
 828 }
 829 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 830
 831 #endif  /* !CONFIG_NFS_V4_1 */
 832
 833 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 834 {
 835         struct nfs4_call_sync_data *data = calldata;
 836         nfs4_setup_sequence(data->seq_server,
 837                                 data->seq_args, data->seq_res, task);
 838 }
 839
 840 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 841 {
 842         struct nfs4_call_sync_data *data = calldata;
 843         nfs4_sequence_done(task, data->seq_res);
 844 }
 845
 846 static const struct rpc_call_ops nfs40_call_sync_ops = {
 847         .rpc_call_prepare = nfs40_call_sync_prepare,
 848         .rpc_call_done = nfs40_call_sync_done,
 849 };
 850
 851 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 852                                    struct nfs_server *server,
 853                                    struct rpc_message *msg,
 854                                    struct nfs4_sequence_args *args,
 855                                    struct nfs4_sequence_res *res)
 856 {
 857         int ret;
 858         struct rpc_task *task;
 859         struct nfs_client *clp = server->nfs_client;
 860         struct nfs4_call_sync_data data = {
 861                 .seq_server = server,
 862                 .seq_args = args,
 863                 .seq_res = res,
 864         };
 865         struct rpc_task_setup task_setup = {
 866                 .rpc_client = clnt,
 867                 .rpc_message = msg,
 868                 .callback_ops = clp->cl_mvops->call_sync_ops,
 869                 .callback_data = &data
 870         };
 871
 872         task = rpc_run_task(&task_setup);
 873         if (IS_ERR(task))
 874                 ret = PTR_ERR(task);
 875         else {
 876                 ret = task->tk_status;
 877                 rpc_put_task(task);
 878         }
 879         return ret;
 880 }
 881
 882 int nfs4_call_sync(struct rpc_clnt *clnt,
 883                    struct nfs_server *server,
 884                    struct rpc_message *msg,
 885                    struct nfs4_sequence_args *args,
 886                    struct nfs4_sequence_res *res,
 887                    int cache_reply)
 888 {
 889         nfs4_init_sequence(args, res, cache_reply);
 890         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 891 }
 892
 893 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 894 {
 895         struct nfs_inode *nfsi = NFS_I(dir);
 896
 897         spin_lock(&dir->i_lock);
 898         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 899         if (!cinfo->atomic || cinfo->before != dir->i_version)
 900                 nfs_force_lookup_revalidate(dir);
 901         dir->i_version = cinfo->after;
 902         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 903         nfs_fscache_invalidate(dir);
 904         spin_unlock(&dir->i_lock);
 905 }
 906
 907 struct nfs4_opendata {
 908         struct kref kref;
 909         struct nfs_openargs o_arg;
 910         struct nfs_openres o_res;
 911         struct nfs_open_confirmargs c_arg;
 912         struct nfs_open_confirmres c_res;
 913         struct nfs4_string owner_name;
 914         struct nfs4_string group_name;
 915         struct nfs4_label *a_label;
 916         struct nfs_fattr f_attr;
 917         struct nfs4_label *f_label;
 918         struct dentry *dir;
 919         struct dentry *dentry;
 920         struct nfs4_state_owner *owner;
 921         struct nfs4_state *state;
 922         struct iattr attrs;
 923         unsigned long timestamp;
 924         unsigned int rpc_done : 1;
 925         unsigned int file_created : 1;
 926         unsigned int is_recover : 1;
 927         int rpc_status;
 928         int cancelled;
 929 };
 930
 931 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 932                 int err, struct nfs4_exception *exception)
 933 {
 934         if (err != -EINVAL)
 935                 return false;
 936         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 937                 return false;
 938         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 939         exception->retry = 1;
 940         return true;
 941 }
 942
 943 static u32
 944 nfs4_map_atomic_open_share(struct nfs_server *server,
 945                 fmode_t fmode, int openflags)
 946 {
 947         u32 res = 0;
 948
 949         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 950         case FMODE_READ:
 951                 res = NFS4_SHARE_ACCESS_READ;
 952                 break;
 953         case FMODE_WRITE:
 954                 res = NFS4_SHARE_ACCESS_WRITE;
 955                 break;
 956         case FMODE_READ|FMODE_WRITE:
 957                 res = NFS4_SHARE_ACCESS_BOTH;
 958         }
 959         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 960                 goto out;
 961         /* Want no delegation if we're using O_DIRECT */
 962         if (openflags & O_DIRECT)
 963                 res |= NFS4_SHARE_WANT_NO_DELEG;
 964 out:
 965         return res;
 966 }
 967
 968 static enum open_claim_type4
 969 nfs4_map_atomic_open_claim(struct nfs_server *server,
 970                 enum open_claim_type4 claim)
 971 {
 972         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 973                 return claim;
 974         switch (claim) {
 975         default:
 976                 return claim;
 977         case NFS4_OPEN_CLAIM_FH:
 978                 return NFS4_OPEN_CLAIM_NULL;
 979         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 980                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 981         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 982                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 983         }
 984 }
 985
 986 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 987 {
 988         p->o_res.f_attr = &p->f_attr;
 989         p->o_res.f_label = p->f_label;
 990         p->o_res.seqid = p->o_arg.seqid;
 991         p->c_res.seqid = p->c_arg.seqid;
 992         p->o_res.server = p->o_arg.server;
 993         p->o_res.access_request = p->o_arg.access;
 994         nfs_fattr_init(&p->f_attr);
 995         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 996 }
 997
 998 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 999                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1000                 const struct iattr *attrs,
1001                 struct nfs4_label *label,
1002                 enum open_claim_type4 claim,
1003                 gfp_t gfp_mask)
1004 {
1005         struct dentry *parent = dget_parent(dentry);
1006         struct inode *dir = d_inode(parent);
1007         struct nfs_server *server = NFS_SERVER(dir);
1008         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1009         struct nfs4_opendata *p;
1010
1011         p = kzalloc(sizeof(*p), gfp_mask);
1012         if (p == NULL)
1013                 goto err;
1014
1015         p->f_label = nfs4_label_alloc(server, gfp_mask);
1016         if (IS_ERR(p->f_label))
1017                 goto err_free_p;
1018
1019         p->a_label = nfs4_label_alloc(server, gfp_mask);
1020         if (IS_ERR(p->a_label))
1021                 goto err_free_f;
1022
1023         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1024         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1025         if (IS_ERR(p->o_arg.seqid))
1026                 goto err_free_label;
1027         nfs_sb_active(dentry->d_sb);
1028         p->dentry = dget(dentry);
1029         p->dir = parent;
1030         p->owner = sp;
1031         atomic_inc(&sp->so_count);
1032         p->o_arg.open_flags = flags;
1033         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1034         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1035                         fmode, flags);
1036         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1037          * will return permission denied for all bits until close */
1038         if (!(flags & O_EXCL)) {
1039                 /* ask server to check for all possible rights as results
1040                  * are cached */
1041                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1042                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1043         }
1044         p->o_arg.clientid = server->nfs_client->cl_clientid;
1045         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1046         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1047         p->o_arg.name = &dentry->d_name;
1048         p->o_arg.server = server;
1049         p->o_arg.bitmask = nfs4_bitmask(server, label);
1050         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1051         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1052         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1053         switch (p->o_arg.claim) {
1054         case NFS4_OPEN_CLAIM_NULL:
1055         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1056         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1057                 p->o_arg.fh = NFS_FH(dir);
1058                 break;
1059         case NFS4_OPEN_CLAIM_PREVIOUS:
1060         case NFS4_OPEN_CLAIM_FH:
1061         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1062         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1063                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1064         }
1065         if (attrs != NULL && attrs->ia_valid != 0) {
1066                 __u32 verf[2];
1067
1068                 p->o_arg.u.attrs = &p->attrs;
1069                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1070
1071                 verf[0] = jiffies;
1072                 verf[1] = current->pid;
1073                 memcpy(p->o_arg.u.verifier.data, verf,
1074                                 sizeof(p->o_arg.u.verifier.data));
1075         }
1076         p->c_arg.fh = &p->o_res.fh;
1077         p->c_arg.stateid = &p->o_res.stateid;
1078         p->c_arg.seqid = p->o_arg.seqid;
1079         nfs4_init_opendata_res(p);
1080         kref_init(&p->kref);
1081         return p;
1082
1083 err_free_label:
1084         nfs4_label_free(p->a_label);
1085 err_free_f:
1086         nfs4_label_free(p->f_label);
1087 err_free_p:
1088         kfree(p);
1089 err:
1090         dput(parent);
1091         return NULL;
1092 }
1093
1094 static void nfs4_opendata_free(struct kref *kref)
1095 {
1096         struct nfs4_opendata *p = container_of(kref,
1097                         struct nfs4_opendata, kref);
1098         struct super_block *sb = p->dentry->d_sb;
1099
1100         nfs_free_seqid(p->o_arg.seqid);
1101         if (p->state != NULL)
1102                 nfs4_put_open_state(p->state);
1103         nfs4_put_state_owner(p->owner);
1104
1105         nfs4_label_free(p->a_label);
1106         nfs4_label_free(p->f_label);
1107
1108         dput(p->dir);
1109         dput(p->dentry);
1110         nfs_sb_deactive(sb);
1111         nfs_fattr_free_names(&p->f_attr);
1112         kfree(p->f_attr.mdsthreshold);
1113         kfree(p);
1114 }
1115
1116 static void nfs4_opendata_put(struct nfs4_opendata *p)
1117 {
1118         if (p != NULL)
1119                 kref_put(&p->kref, nfs4_opendata_free);
1120 }
1121
1122 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1123 {
1124         int ret;
1125
1126         ret = rpc_wait_for_completion_task(task);
1127         return ret;
1128 }
1129
1130 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1131 {
1132         int ret = 0;
1133
1134         if (open_mode & (O_EXCL|O_TRUNC))
1135                 goto out;
1136         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1137                 case FMODE_READ:
1138                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1139                                 && state->n_rdonly != 0;
1140                         break;
1141                 case FMODE_WRITE:
1142                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1143                                 && state->n_wronly != 0;
1144                         break;
1145                 case FMODE_READ|FMODE_WRITE:
1146                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1147                                 && state->n_rdwr != 0;
1148         }
1149 out:
1150         return ret;
1151 }
1152
1153 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1154                 enum open_claim_type4 claim)
1155 {
1156         if (delegation == NULL)
1157                 return 0;
1158         if ((delegation->type & fmode) != fmode)
1159                 return 0;
1160         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1161                 return 0;
1162         switch (claim) {
1163         case NFS4_OPEN_CLAIM_NULL:
1164         case NFS4_OPEN_CLAIM_FH:
1165                 break;
1166         case NFS4_OPEN_CLAIM_PREVIOUS:
1167                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1168                         break;
1169         default:
1170                 return 0;
1171         }
1172         nfs_mark_delegation_referenced(delegation);
1173         return 1;
1174 }
1175
1176 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1177 {
1178         switch (fmode) {
1179                 case FMODE_WRITE:
1180                         state->n_wronly++;
1181                         break;
1182                 case FMODE_READ:
1183                         state->n_rdonly++;
1184                         break;
1185                 case FMODE_READ|FMODE_WRITE:
1186                         state->n_rdwr++;
1187         }
1188         nfs4_state_set_mode_locked(state, state->state | fmode);
1189 }
1190
1191 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1192 {
1193         struct nfs_client *clp = state->owner->so_server->nfs_client;
1194         bool need_recover = false;
1195
1196         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1197                 need_recover = true;
1198         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1199                 need_recover = true;
1200         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1201                 need_recover = true;
1202         if (need_recover)
1203                 nfs4_state_mark_reclaim_nograce(clp, state);
1204 }
1205
1206 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1207                 nfs4_stateid *stateid)
1208 {
1209         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1210                 return true;
1211         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1212                 nfs_test_and_clear_all_open_stateid(state);
1213                 return true;
1214         }
1215         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1216                 return true;
1217         return false;
1218 }
1219
1220 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1221 {
1222         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1223                 return;
1224         if (state->n_wronly)
1225                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1226         if (state->n_rdonly)
1227                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1228         if (state->n_rdwr)
1229                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1230         set_bit(NFS_OPEN_STATE, &state->flags);
1231 }
1232
1233 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1234                 nfs4_stateid *arg_stateid,
1235                 nfs4_stateid *stateid, fmode_t fmode)
1236 {
1237         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1238         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1239         case FMODE_WRITE:
1240                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1241                 break;
1242         case FMODE_READ:
1243                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1244                 break;
1245         case 0:
1246                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1247                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1248                 clear_bit(NFS_OPEN_STATE, &state->flags);
1249         }
1250         if (stateid == NULL)
1251                 return;
1252         /* Handle races with OPEN */
1253         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1254             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1255             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1256                 nfs_resync_open_stateid_locked(state);
1257                 return;
1258         }
1259         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1260                 nfs4_stateid_copy(&state->stateid, stateid);
1261         nfs4_stateid_copy(&state->open_stateid, stateid);
1262 }
1263
1264 static void nfs_clear_open_stateid(struct nfs4_state *state,
1265         nfs4_stateid *arg_stateid,
1266         nfs4_stateid *stateid, fmode_t fmode)
1267 {
1268         write_seqlock(&state->seqlock);
1269         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1270         write_sequnlock(&state->seqlock);
1271         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1272                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1273 }
1274
1275 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1276 {
1277         switch (fmode) {
1278                 case FMODE_READ:
1279                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1280                         break;
1281                 case FMODE_WRITE:
1282                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1283                         break;
1284                 case FMODE_READ|FMODE_WRITE:
1285                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1286         }
1287         if (!nfs_need_update_open_stateid(state, stateid))
1288                 return;
1289         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1290                 nfs4_stateid_copy(&state->stateid, stateid);
1291         nfs4_stateid_copy(&state->open_stateid, stateid);
1292 }
1293
1294 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1295 {
1296         /*
1297          * Protect the call to nfs4_state_set_mode_locked and
1298          * serialise the stateid update
1299          */
1300         write_seqlock(&state->seqlock);
1301         if (deleg_stateid != NULL) {
1302                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1303                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1304         }
1305         if (open_stateid != NULL)
1306                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1307         write_sequnlock(&state->seqlock);
1308         spin_lock(&state->owner->so_lock);
1309         update_open_stateflags(state, fmode);
1310         spin_unlock(&state->owner->so_lock);
1311 }
1312
1313 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1314 {
1315         struct nfs_inode *nfsi = NFS_I(state->inode);
1316         struct nfs_delegation *deleg_cur;
1317         int ret = 0;
1318
1319         fmode &= (FMODE_READ|FMODE_WRITE);
1320
1321         rcu_read_lock();
1322         deleg_cur = rcu_dereference(nfsi->delegation);
1323         if (deleg_cur == NULL)
1324                 goto no_delegation;
1325
1326         spin_lock(&deleg_cur->lock);
1327         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1328            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1329             (deleg_cur->type & fmode) != fmode)
1330                 goto no_delegation_unlock;
1331
1332         if (delegation == NULL)
1333                 delegation = &deleg_cur->stateid;
1334         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1335                 goto no_delegation_unlock;
1336
1337         nfs_mark_delegation_referenced(deleg_cur);
1338         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1339         ret = 1;
1340 no_delegation_unlock:
1341         spin_unlock(&deleg_cur->lock);
1342 no_delegation:
1343         rcu_read_unlock();
1344
1345         if (!ret && open_stateid != NULL) {
1346                 __update_open_stateid(state, open_stateid, NULL, fmode);
1347                 ret = 1;
1348         }
1349         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1350                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1351
1352         return ret;
1353 }
1354
1355 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1356                 const nfs4_stateid *stateid)
1357 {
1358         struct nfs4_state *state = lsp->ls_state;
1359         bool ret = false;
1360
1361         spin_lock(&state->state_lock);
1362         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1363                 goto out_noupdate;
1364         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1365                 goto out_noupdate;
1366         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1367         ret = true;
1368 out_noupdate:
1369         spin_unlock(&state->state_lock);
1370         return ret;
1371 }
1372
1373 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1374 {
1375         struct nfs_delegation *delegation;
1376
1377         rcu_read_lock();
1378         delegation = rcu_dereference(NFS_I(inode)->delegation);
1379         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1380                 rcu_read_unlock();
1381                 return;
1382         }
1383         rcu_read_unlock();
1384         nfs4_inode_return_delegation(inode);
1385 }
1386
1387 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1388 {
1389         struct nfs4_state *state = opendata->state;
1390         struct nfs_inode *nfsi = NFS_I(state->inode);
1391         struct nfs_delegation *delegation;
1392         int open_mode = opendata->o_arg.open_flags;
1393         fmode_t fmode = opendata->o_arg.fmode;
1394         enum open_claim_type4 claim = opendata->o_arg.claim;
1395         nfs4_stateid stateid;
1396         int ret = -EAGAIN;
1397
1398         for (;;) {
1399                 spin_lock(&state->owner->so_lock);
1400                 if (can_open_cached(state, fmode, open_mode)) {
1401                         update_open_stateflags(state, fmode);
1402                         spin_unlock(&state->owner->so_lock);
1403                         goto out_return_state;
1404                 }
1405                 spin_unlock(&state->owner->so_lock);
1406                 rcu_read_lock();
1407                 delegation = rcu_dereference(nfsi->delegation);
1408                 if (!can_open_delegated(delegation, fmode, claim)) {
1409                         rcu_read_unlock();
1410                         break;
1411                 }
1412                 /* Save the delegation */
1413                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1414                 rcu_read_unlock();
1415                 nfs_release_seqid(opendata->o_arg.seqid);
1416                 if (!opendata->is_recover) {
1417                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1418                         if (ret != 0)
1419                                 goto out;
1420                 }
1421                 ret = -EAGAIN;
1422
1423                 /* Try to update the stateid using the delegation */
1424                 if (update_open_stateid(state, NULL, &stateid, fmode))
1425                         goto out_return_state;
1426         }
1427 out:
1428         return ERR_PTR(ret);
1429 out_return_state:
1430         atomic_inc(&state->count);
1431         return state;
1432 }
1433
1434 static void
1435 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1436 {
1437         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1438         struct nfs_delegation *delegation;
1439         int delegation_flags = 0;
1440
1441         rcu_read_lock();
1442         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1443         if (delegation)
1444                 delegation_flags = delegation->flags;
1445         rcu_read_unlock();
1446         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1447                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1448                                    "returning a delegation for "
1449                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1450                                    clp->cl_hostname);
1451         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1452                 nfs_inode_set_delegation(state->inode,
1453                                          data->owner->so_cred,
1454                                          &data->o_res);
1455         else
1456                 nfs_inode_reclaim_delegation(state->inode,
1457                                              data->owner->so_cred,
1458                                              &data->o_res);
1459 }
1460
1461 /*
1462  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1463  * and update the nfs4_state.
1464  */
1465 static struct nfs4_state *
1466 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1467 {
1468         struct inode *inode = data->state->inode;
1469         struct nfs4_state *state = data->state;
1470         int ret;
1471
1472         if (!data->rpc_done) {
1473                 if (data->rpc_status) {
1474                         ret = data->rpc_status;
1475                         goto err;
1476                 }
1477                 /* cached opens have already been processed */
1478                 goto update;
1479         }
1480
1481         ret = nfs_refresh_inode(inode, &data->f_attr);
1482         if (ret)
1483                 goto err;
1484
1485         if (data->o_res.delegation_type != 0)
1486                 nfs4_opendata_check_deleg(data, state);
1487 update:
1488         update_open_stateid(state, &data->o_res.stateid, NULL,
1489                             data->o_arg.fmode);
1490         atomic_inc(&state->count);
1491
1492         return state;
1493 err:
1494         return ERR_PTR(ret);
1495
1496 }
1497
1498 static struct nfs4_state *
1499 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1500 {
1501         struct inode *inode;
1502         struct nfs4_state *state = NULL;
1503         int ret;
1504
1505         if (!data->rpc_done) {
1506                 state = nfs4_try_open_cached(data);
1507                 goto out;
1508         }
1509
1510         ret = -EAGAIN;
1511         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1512                 goto err;
1513         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1514         ret = PTR_ERR(inode);
1515         if (IS_ERR(inode))
1516                 goto err;
1517         ret = -ENOMEM;
1518         state = nfs4_get_open_state(inode, data->owner);
1519         if (state == NULL)
1520                 goto err_put_inode;
1521         if (data->o_res.delegation_type != 0)
1522                 nfs4_opendata_check_deleg(data, state);
1523         update_open_stateid(state, &data->o_res.stateid, NULL,
1524                         data->o_arg.fmode);
1525         iput(inode);
1526 out:
1527         nfs_release_seqid(data->o_arg.seqid);
1528         return state;
1529 err_put_inode:
1530         iput(inode);
1531 err:
1532         return ERR_PTR(ret);
1533 }
1534
1535 static struct nfs4_state *
1536 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1537 {
1538         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1539                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1540         return _nfs4_opendata_to_nfs4_state(data);
1541 }
1542
1543 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1544 {
1545         struct nfs_inode *nfsi = NFS_I(state->inode);
1546         struct nfs_open_context *ctx;
1547
1548         spin_lock(&state->inode->i_lock);
1549         list_for_each_entry(ctx, &nfsi->open_files, list) {
1550                 if (ctx->state != state)
1551                         continue;
1552                 get_nfs_open_context(ctx);
1553                 spin_unlock(&state->inode->i_lock);
1554                 return ctx;
1555         }
1556         spin_unlock(&state->inode->i_lock);
1557         return ERR_PTR(-ENOENT);
1558 }
1559
1560 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1561                 struct nfs4_state *state, enum open_claim_type4 claim)
1562 {
1563         struct nfs4_opendata *opendata;
1564
1565         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1566                         NULL, NULL, claim, GFP_NOFS);
1567         if (opendata == NULL)
1568                 return ERR_PTR(-ENOMEM);
1569         opendata->state = state;
1570         atomic_inc(&state->count);
1571         return opendata;
1572 }
1573
1574 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1575 {
1576         struct nfs4_state *newstate;
1577         int ret;
1578
1579         if ((opendata->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
1580              opendata->o_arg.claim == NFS4_OPEN_CLAIM_DELEG_CUR_FH) &&
1581             (opendata->o_arg.u.delegation_type & fmode) != fmode)
1582                 /* This mode can't have been delegated, so we must have
1583                  * a valid open_stateid to cover it - not need to reclaim.
1584                  */
1585                 return 0;
1586         opendata->o_arg.open_flags = 0;
1587         opendata->o_arg.fmode = fmode;
1588         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1589                         NFS_SB(opendata->dentry->d_sb),
1590                         fmode, 0);
1591         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1592         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1593         nfs4_init_opendata_res(opendata);
1594         ret = _nfs4_recover_proc_open(opendata);
1595         if (ret != 0)
1596                 return ret;
1597         newstate = nfs4_opendata_to_nfs4_state(opendata);
1598         if (IS_ERR(newstate))
1599                 return PTR_ERR(newstate);
1600         nfs4_close_state(newstate, fmode);
1601         *res = newstate;
1602         return 0;
1603 }
1604
1605 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1606 {
1607         struct nfs4_state *newstate;
1608         int ret;
1609
1610         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1611         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1612         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1613         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1614         /* memory barrier prior to reading state->n_* */
1615         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1616         clear_bit(NFS_OPEN_STATE, &state->flags);
1617         smp_rmb();
1618         if (state->n_rdwr != 0) {
1619                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1620                 if (ret != 0)
1621                         return ret;
1622                 if (newstate != state)
1623                         return -ESTALE;
1624         }
1625         if (state->n_wronly != 0) {
1626                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1627                 if (ret != 0)
1628                         return ret;
1629                 if (newstate != state)
1630                         return -ESTALE;
1631         }
1632         if (state->n_rdonly != 0) {
1633                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1634                 if (ret != 0)
1635                         return ret;
1636                 if (newstate != state)
1637                         return -ESTALE;
1638         }
1639         /*
1640          * We may have performed cached opens for all three recoveries.
1641          * Check if we need to update the current stateid.
1642          */
1643         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1644             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1645                 write_seqlock(&state->seqlock);
1646                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1647                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1648                 write_sequnlock(&state->seqlock);
1649         }
1650         return 0;
1651 }
1652
1653 /*
1654  * OPEN_RECLAIM:
1655  *      reclaim state on the server after a reboot.
1656  */
1657 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1658 {
1659         struct nfs_delegation *delegation;
1660         struct nfs4_opendata *opendata;
1661         fmode_t delegation_type = 0;
1662         int status;
1663
1664         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1665                         NFS4_OPEN_CLAIM_PREVIOUS);
1666         if (IS_ERR(opendata))
1667                 return PTR_ERR(opendata);
1668         rcu_read_lock();
1669         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1670         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1671                 delegation_type = delegation->type;
1672         rcu_read_unlock();
1673         opendata->o_arg.u.delegation_type = delegation_type;
1674         status = nfs4_open_recover(opendata, state);
1675         nfs4_opendata_put(opendata);
1676         return status;
1677 }
1678
1679 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1680 {
1681         struct nfs_server *server = NFS_SERVER(state->inode);
1682         struct nfs4_exception exception = { };
1683         int err;
1684         do {
1685                 err = _nfs4_do_open_reclaim(ctx, state);
1686                 trace_nfs4_open_reclaim(ctx, 0, err);
1687                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1688                         continue;
1689                 if (err != -NFS4ERR_DELAY)
1690                         break;
1691                 nfs4_handle_exception(server, err, &exception);
1692         } while (exception.retry);
1693         return err;
1694 }
1695
1696 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1697 {
1698         struct nfs_open_context *ctx;
1699         int ret;
1700
1701         ctx = nfs4_state_find_open_context(state);
1702         if (IS_ERR(ctx))
1703                 return -EAGAIN;
1704         ret = nfs4_do_open_reclaim(ctx, state);
1705         put_nfs_open_context(ctx);
1706         return ret;
1707 }
1708
1709 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1710 {
1711         switch (err) {
1712                 default:
1713                         printk(KERN_ERR "NFS: %s: unhandled error "
1714                                         "%d.\n", __func__, err);
1715                 case 0:
1716                 case -ENOENT:
1717                 case -EAGAIN:
1718                 case -ESTALE:
1719                         break;
1720                 case -NFS4ERR_BADSESSION:
1721                 case -NFS4ERR_BADSLOT:
1722                 case -NFS4ERR_BAD_HIGH_SLOT:
1723                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1724                 case -NFS4ERR_DEADSESSION:
1725                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1726                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1727                         return -EAGAIN;
1728                 case -NFS4ERR_STALE_CLIENTID:
1729                 case -NFS4ERR_STALE_STATEID:
1730                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1731                 case -NFS4ERR_EXPIRED:
1732                         /* Don't recall a delegation if it was lost */
1733                         nfs4_schedule_lease_recovery(server->nfs_client);
1734                         return -EAGAIN;
1735                 case -NFS4ERR_MOVED:
1736                         nfs4_schedule_migration_recovery(server);
1737                         return -EAGAIN;
1738                 case -NFS4ERR_LEASE_MOVED:
1739                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1740                         return -EAGAIN;
1741                 case -NFS4ERR_DELEG_REVOKED:
1742                 case -NFS4ERR_ADMIN_REVOKED:
1743                 case -NFS4ERR_BAD_STATEID:
1744                 case -NFS4ERR_OPENMODE:
1745                         nfs_inode_find_state_and_recover(state->inode,
1746                                         stateid);
1747                         nfs4_schedule_stateid_recovery(server, state);
1748                         return -EAGAIN;
1749                 case -NFS4ERR_DELAY:
1750                 case -NFS4ERR_GRACE:
1751                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1752                         ssleep(1);
1753                         return -EAGAIN;
1754                 case -ENOMEM:
1755                 case -NFS4ERR_DENIED:
1756                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1757                         return 0;
1758         }
1759         return err;
1760 }
1761
1762 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1763 {
1764         struct nfs_server *server = NFS_SERVER(state->inode);
1765         struct nfs4_opendata *opendata;
1766         int err;
1767
1768         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1769                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1770         if (IS_ERR(opendata))
1771                 return PTR_ERR(opendata);
1772         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1773         err = nfs4_open_recover(opendata, state);
1774         nfs4_opendata_put(opendata);
1775         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1776 }
1777
1778 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1779 {
1780         struct nfs4_opendata *data = calldata;
1781
1782         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1783                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1784 }
1785
1786 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1787 {
1788         struct nfs4_opendata *data = calldata;
1789
1790         nfs40_sequence_done(task, &data->c_res.seq_res);
1791
1792         data->rpc_status = task->tk_status;
1793         if (data->rpc_status == 0) {
1794                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1795                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1796                 renew_lease(data->o_res.server, data->timestamp);
1797                 data->rpc_done = 1;
1798         }
1799 }
1800
1801 static void nfs4_open_confirm_release(void *calldata)
1802 {
1803         struct nfs4_opendata *data = calldata;
1804         struct nfs4_state *state = NULL;
1805
1806         /* If this request hasn't been cancelled, do nothing */
1807         if (data->cancelled == 0)
1808                 goto out_free;
1809         /* In case of error, no cleanup! */
1810         if (!data->rpc_done)
1811                 goto out_free;
1812         state = nfs4_opendata_to_nfs4_state(data);
1813         if (!IS_ERR(state))
1814                 nfs4_close_state(state, data->o_arg.fmode);
1815 out_free:
1816         nfs4_opendata_put(data);
1817 }
1818
1819 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1820         .rpc_call_prepare = nfs4_open_confirm_prepare,
1821         .rpc_call_done = nfs4_open_confirm_done,
1822         .rpc_release = nfs4_open_confirm_release,
1823 };
1824
1825 /*
1826  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1827  */
1828 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1829 {
1830         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1831         struct rpc_task *task;
1832         struct  rpc_message msg = {
1833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1834                 .rpc_argp = &data->c_arg,
1835                 .rpc_resp = &data->c_res,
1836                 .rpc_cred = data->owner->so_cred,
1837         };
1838         struct rpc_task_setup task_setup_data = {
1839                 .rpc_client = server->client,
1840                 .rpc_message = &msg,
1841                 .callback_ops = &nfs4_open_confirm_ops,
1842                 .callback_data = data,
1843                 .workqueue = nfsiod_workqueue,
1844                 .flags = RPC_TASK_ASYNC,
1845         };
1846         int status;
1847
1848         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1849         kref_get(&data->kref);
1850         data->rpc_done = 0;
1851         data->rpc_status = 0;
1852         data->timestamp = jiffies;
1853         task = rpc_run_task(&task_setup_data);
1854         if (IS_ERR(task))
1855                 return PTR_ERR(task);
1856         status = nfs4_wait_for_completion_rpc_task(task);
1857         if (status != 0) {
1858                 data->cancelled = 1;
1859                 smp_wmb();
1860         } else
1861                 status = data->rpc_status;
1862         rpc_put_task(task);
1863         return status;
1864 }
1865
1866 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1867 {
1868         struct nfs4_opendata *data = calldata;
1869         struct nfs4_state_owner *sp = data->owner;
1870         struct nfs_client *clp = sp->so_server->nfs_client;
1871         enum open_claim_type4 claim = data->o_arg.claim;
1872
1873         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1874                 goto out_wait;
1875         /*
1876          * Check if we still need to send an OPEN call, or if we can use
1877          * a delegation instead.
1878          */
1879         if (data->state != NULL) {
1880                 struct nfs_delegation *delegation;
1881
1882                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1883                         goto out_no_action;
1884                 rcu_read_lock();
1885                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1886                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
1887                         goto unlock_no_action;
1888                 rcu_read_unlock();
1889         }
1890         /* Update client id. */
1891         data->o_arg.clientid = clp->cl_clientid;
1892         switch (claim) {
1893         default:
1894                 break;
1895         case NFS4_OPEN_CLAIM_PREVIOUS:
1896         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1897         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1898                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1899         case NFS4_OPEN_CLAIM_FH:
1900                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1901                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1902         }
1903         data->timestamp = jiffies;
1904         if (nfs4_setup_sequence(data->o_arg.server,
1905                                 &data->o_arg.seq_args,
1906                                 &data->o_res.seq_res,
1907                                 task) != 0)
1908                 nfs_release_seqid(data->o_arg.seqid);
1909
1910         /* Set the create mode (note dependency on the session type) */
1911         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1912         if (data->o_arg.open_flags & O_EXCL) {
1913                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1914                 if (nfs4_has_persistent_session(clp))
1915                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1916                 else if (clp->cl_mvops->minor_version > 0)
1917                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1918         }
1919         return;
1920 unlock_no_action:
1921         rcu_read_unlock();
1922 out_no_action:
1923         task->tk_action = NULL;
1924 out_wait:
1925         nfs4_sequence_done(task, &data->o_res.seq_res);
1926 }
1927
1928 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1929 {
1930         struct nfs4_opendata *data = calldata;
1931
1932         data->rpc_status = task->tk_status;
1933
1934         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1935                 return;
1936
1937         if (task->tk_status == 0) {
1938                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1939                         switch (data->o_res.f_attr->mode & S_IFMT) {
1940                         case S_IFREG:
1941                                 break;
1942                         case S_IFLNK:
1943                                 data->rpc_status = -ELOOP;
1944                                 break;
1945                         case S_IFDIR:
1946                                 data->rpc_status = -EISDIR;
1947                                 break;
1948                         default:
1949                                 data->rpc_status = -ENOTDIR;
1950                         }
1951                 }
1952                 renew_lease(data->o_res.server, data->timestamp);
1953                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1954                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1955         }
1956         data->rpc_done = 1;
1957 }
1958
1959 static void nfs4_open_release(void *calldata)
1960 {
1961         struct nfs4_opendata *data = calldata;
1962         struct nfs4_state *state = NULL;
1963
1964         /* If this request hasn't been cancelled, do nothing */
1965         if (data->cancelled == 0)
1966                 goto out_free;
1967         /* In case of error, no cleanup! */
1968         if (data->rpc_status != 0 || !data->rpc_done)
1969                 goto out_free;
1970         /* In case we need an open_confirm, no cleanup! */
1971         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1972                 goto out_free;
1973         state = nfs4_opendata_to_nfs4_state(data);
1974         if (!IS_ERR(state))
1975                 nfs4_close_state(state, data->o_arg.fmode);
1976 out_free:
1977         nfs4_opendata_put(data);
1978 }
1979
1980 static const struct rpc_call_ops nfs4_open_ops = {
1981         .rpc_call_prepare = nfs4_open_prepare,
1982         .rpc_call_done = nfs4_open_done,
1983         .rpc_release = nfs4_open_release,
1984 };
1985
1986 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1987 {
1988         struct inode *dir = d_inode(data->dir);
1989         struct nfs_server *server = NFS_SERVER(dir);
1990         struct nfs_openargs *o_arg = &data->o_arg;
1991         struct nfs_openres *o_res = &data->o_res;
1992         struct rpc_task *task;
1993         struct rpc_message msg = {
1994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1995                 .rpc_argp = o_arg,
1996                 .rpc_resp = o_res,
1997                 .rpc_cred = data->owner->so_cred,
1998         };
1999         struct rpc_task_setup task_setup_data = {
2000                 .rpc_client = server->client,
2001                 .rpc_message = &msg,
2002                 .callback_ops = &nfs4_open_ops,
2003                 .callback_data = data,
2004                 .workqueue = nfsiod_workqueue,
2005                 .flags = RPC_TASK_ASYNC,
2006         };
2007         int status;
2008
2009         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2010         kref_get(&data->kref);
2011         data->rpc_done = 0;
2012         data->rpc_status = 0;
2013         data->cancelled = 0;
2014         data->is_recover = 0;
2015         if (isrecover) {
2016                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2017                 data->is_recover = 1;
2018         }
2019         task = rpc_run_task(&task_setup_data);
2020         if (IS_ERR(task))
2021                 return PTR_ERR(task);
2022         status = nfs4_wait_for_completion_rpc_task(task);
2023         if (status != 0) {
2024                 data->cancelled = 1;
2025                 smp_wmb();
2026         } else
2027                 status = data->rpc_status;
2028         rpc_put_task(task);
2029
2030         return status;
2031 }
2032
2033 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2034 {
2035         struct inode *dir = d_inode(data->dir);
2036         struct nfs_openres *o_res = &data->o_res;
2037         int status;
2038
2039         status = nfs4_run_open_task(data, 1);
2040         if (status != 0 || !data->rpc_done)
2041                 return status;
2042
2043         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2044
2045         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2046                 status = _nfs4_proc_open_confirm(data);
2047                 if (status != 0)
2048                         return status;
2049         }
2050
2051         return status;
2052 }
2053
2054 /*
2055  * Additional permission checks in order to distinguish between an
2056  * open for read, and an open for execute. This works around the
2057  * fact that NFSv4 OPEN treats read and execute permissions as being
2058  * the same.
2059  * Note that in the non-execute case, we want to turn off permission
2060  * checking if we just created a new file (POSIX open() semantics).
2061  */
2062 static int nfs4_opendata_access(struct rpc_cred *cred,
2063                                 struct nfs4_opendata *opendata,
2064                                 struct nfs4_state *state, fmode_t fmode,
2065                                 int openflags)
2066 {
2067         struct nfs_access_entry cache;
2068         u32 mask;
2069
2070         /* access call failed or for some reason the server doesn't
2071          * support any access modes -- defer access call until later */
2072         if (opendata->o_res.access_supported == 0)
2073                 return 0;
2074
2075         mask = 0;
2076         /*
2077          * Use openflags to check for exec, because fmode won't
2078          * always have FMODE_EXEC set when file open for exec.
2079          */
2080         if (openflags & __FMODE_EXEC) {
2081                 /* ONLY check for exec rights */
2082                 mask = MAY_EXEC;
2083         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2084                 mask = MAY_READ;
2085
2086         cache.cred = cred;
2087         cache.jiffies = jiffies;
2088         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2089         nfs_access_add_cache(state->inode, &cache);
2090
2091         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2092                 return 0;
2093
2094         /* even though OPEN succeeded, access is denied. Close the file */
2095         nfs4_close_state(state, fmode);
2096         return -EACCES;
2097 }
2098
2099 /*
2100  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2101  */
2102 static int _nfs4_proc_open(struct nfs4_opendata *data)
2103 {
2104         struct inode *dir = d_inode(data->dir);
2105         struct nfs_server *server = NFS_SERVER(dir);
2106         struct nfs_openargs *o_arg = &data->o_arg;
2107         struct nfs_openres *o_res = &data->o_res;
2108         int status;
2109
2110         status = nfs4_run_open_task(data, 0);
2111         if (!data->rpc_done)
2112                 return status;
2113         if (status != 0) {
2114                 if (status == -NFS4ERR_BADNAME &&
2115                                 !(o_arg->open_flags & O_CREAT))
2116                         return -ENOENT;
2117                 return status;
2118         }
2119
2120         nfs_fattr_map_and_free_names(server, &data->f_attr);
2121
2122         if (o_arg->open_flags & O_CREAT) {
2123                 update_changeattr(dir, &o_res->cinfo);
2124                 if (o_arg->open_flags & O_EXCL)
2125                         data->file_created = 1;
2126                 else if (o_res->cinfo.before != o_res->cinfo.after)
2127                         data->file_created = 1;
2128         }
2129         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2130                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2131         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2132                 status = _nfs4_proc_open_confirm(data);
2133                 if (status != 0)
2134                         return status;
2135         }
2136         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2137                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2138         return 0;
2139 }
2140
2141 static int nfs4_recover_expired_lease(struct nfs_server *server)
2142 {
2143         return nfs4_client_recover_expired_lease(server->nfs_client);
2144 }
2145
2146 /*
2147  * OPEN_EXPIRED:
2148  *      reclaim state on the server after a network partition.
2149  *      Assumes caller holds the appropriate lock
2150  */
2151 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2152 {
2153         struct nfs4_opendata *opendata;
2154         int ret;
2155
2156         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2157                         NFS4_OPEN_CLAIM_FH);
2158         if (IS_ERR(opendata))
2159                 return PTR_ERR(opendata);
2160         ret = nfs4_open_recover(opendata, state);
2161         if (ret == -ESTALE)
2162                 d_drop(ctx->dentry);
2163         nfs4_opendata_put(opendata);
2164         return ret;
2165 }
2166
2167 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2168 {
2169         struct nfs_server *server = NFS_SERVER(state->inode);
2170         struct nfs4_exception exception = { };
2171         int err;
2172
2173         do {
2174                 err = _nfs4_open_expired(ctx, state);
2175                 trace_nfs4_open_expired(ctx, 0, err);
2176                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2177                         continue;
2178                 switch (err) {
2179                 default:
2180                         goto out;
2181                 case -NFS4ERR_GRACE:
2182                 case -NFS4ERR_DELAY:
2183                         nfs4_handle_exception(server, err, &exception);
2184                         err = 0;
2185                 }
2186         } while (exception.retry);
2187 out:
2188         return err;
2189 }
2190
2191 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2192 {
2193         struct nfs_open_context *ctx;
2194         int ret;
2195
2196         ctx = nfs4_state_find_open_context(state);
2197         if (IS_ERR(ctx))
2198                 return -EAGAIN;
2199         ret = nfs4_do_open_expired(ctx, state);
2200         put_nfs_open_context(ctx);
2201         return ret;
2202 }
2203
2204 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2205 {
2206         nfs_remove_bad_delegation(state->inode);
2207         write_seqlock(&state->seqlock);
2208         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2209         write_sequnlock(&state->seqlock);
2210         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2211 }
2212
2213 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2214 {
2215         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2216                 nfs_finish_clear_delegation_stateid(state);
2217 }
2218
2219 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2220 {
2221         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2222         nfs40_clear_delegation_stateid(state);
2223         return nfs4_open_expired(sp, state);
2224 }
2225
2226 #if defined(CONFIG_NFS_V4_1)
2227 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2228 {
2229         struct nfs_server *server = NFS_SERVER(state->inode);
2230         nfs4_stateid stateid;
2231         struct nfs_delegation *delegation;
2232         struct rpc_cred *cred;
2233         int status;
2234
2235         /* Get the delegation credential for use by test/free_stateid */
2236         rcu_read_lock();
2237         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2238         if (delegation == NULL) {
2239                 rcu_read_unlock();
2240                 return;
2241         }
2242
2243         nfs4_stateid_copy(&stateid, &delegation->stateid);
2244         cred = get_rpccred(delegation->cred);
2245         rcu_read_unlock();
2246         status = nfs41_test_stateid(server, &stateid, cred);
2247         trace_nfs4_test_delegation_stateid(state, NULL, status);
2248
2249         if (status != NFS_OK) {
2250                 /* Free the stateid unless the server explicitly
2251                  * informs us the stateid is unrecognized. */
2252                 if (status != -NFS4ERR_BAD_STATEID)
2253                         nfs41_free_stateid(server, &stateid, cred);
2254                 nfs_finish_clear_delegation_stateid(state);
2255         }
2256
2257         put_rpccred(cred);
2258 }
2259
2260 /**
2261  * nfs41_check_open_stateid - possibly free an open stateid
2262  *
2263  * @state: NFSv4 state for an inode
2264  *
2265  * Returns NFS_OK if recovery for this stateid is now finished.
2266  * Otherwise a negative NFS4ERR value is returned.
2267  */
2268 static int nfs41_check_open_stateid(struct nfs4_state *state)
2269 {
2270         struct nfs_server *server = NFS_SERVER(state->inode);
2271         nfs4_stateid *stateid = &state->open_stateid;
2272         struct rpc_cred *cred = state->owner->so_cred;
2273         int status;
2274
2275         /* If a state reset has been done, test_stateid is unneeded */
2276         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2277             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2278             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2279                 return -NFS4ERR_BAD_STATEID;
2280
2281         status = nfs41_test_stateid(server, stateid, cred);
2282         trace_nfs4_test_open_stateid(state, NULL, status);
2283         if (status != NFS_OK) {
2284                 /* Free the stateid unless the server explicitly
2285                  * informs us the stateid is unrecognized. */
2286                 if (status != -NFS4ERR_BAD_STATEID)
2287                         nfs41_free_stateid(server, stateid, cred);
2288
2289                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2290                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2291                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2292                 clear_bit(NFS_OPEN_STATE, &state->flags);
2293         }
2294         return status;
2295 }
2296
2297 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2298 {
2299         int status;
2300
2301         nfs41_check_delegation_stateid(state);
2302         status = nfs41_check_open_stateid(state);
2303         if (status != NFS_OK)
2304                 status = nfs4_open_expired(sp, state);
2305         return status;
2306 }
2307 #endif
2308
2309 /*
2310  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2311  * fields corresponding to attributes that were used to store the verifier.
2312  * Make sure we clobber those fields in the later setattr call
2313  */
2314 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2315                                 struct iattr *sattr, struct nfs4_label **label)
2316 {
2317         const u32 *attrset = opendata->o_res.attrset;
2318
2319         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2320             !(sattr->ia_valid & ATTR_ATIME_SET))
2321                 sattr->ia_valid |= ATTR_ATIME;
2322
2323         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2324             !(sattr->ia_valid & ATTR_MTIME_SET))
2325                 sattr->ia_valid |= ATTR_MTIME;
2326
2327         /* Except MODE, it seems harmless of setting twice. */
2328         if ((attrset[1] & FATTR4_WORD1_MODE))
2329                 sattr->ia_valid &= ~ATTR_MODE;
2330
2331         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2332                 *label = NULL;
2333 }
2334
2335 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2336                 fmode_t fmode,
2337                 int flags,
2338                 struct nfs_open_context *ctx)
2339 {
2340         struct nfs4_state_owner *sp = opendata->owner;
2341         struct nfs_server *server = sp->so_server;
2342         struct dentry *dentry;
2343         struct nfs4_state *state;
2344         unsigned int seq;
2345         int ret;
2346
2347         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2348
2349         ret = _nfs4_proc_open(opendata);
2350         if (ret != 0)
2351                 goto out;
2352
2353         state = nfs4_opendata_to_nfs4_state(opendata);
2354         ret = PTR_ERR(state);
2355         if (IS_ERR(state))
2356                 goto out;
2357         if (server->caps & NFS_CAP_POSIX_LOCK)
2358                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2359
2360         dentry = opendata->dentry;
2361         if (d_really_is_negative(dentry)) {
2362                 /* FIXME: Is this d_drop() ever needed? */
2363                 d_drop(dentry);
2364                 dentry = d_add_unique(dentry, igrab(state->inode));
2365                 if (dentry == NULL) {
2366                         dentry = opendata->dentry;
2367                 } else if (dentry != ctx->dentry) {
2368                         dput(ctx->dentry);
2369                         ctx->dentry = dget(dentry);
2370                 }
2371                 nfs_set_verifier(dentry,
2372                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2373         }
2374
2375         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2376         if (ret != 0)
2377                 goto out;
2378
2379         ctx->state = state;
2380         if (d_inode(dentry) == state->inode) {
2381                 nfs_inode_attach_open_context(ctx);
2382                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2383                         nfs4_schedule_stateid_recovery(server, state);
2384         }
2385 out:
2386         return ret;
2387 }
2388
2389 /*
2390  * Returns a referenced nfs4_state
2391  */
2392 static int _nfs4_do_open(struct inode *dir,
2393                         struct nfs_open_context *ctx,
2394                         int flags,
2395                         struct iattr *sattr,
2396                         struct nfs4_label *label,
2397                         int *opened)
2398 {
2399         struct nfs4_state_owner  *sp;
2400         struct nfs4_state     *state = NULL;
2401         struct nfs_server       *server = NFS_SERVER(dir);
2402         struct nfs4_opendata *opendata;
2403         struct dentry *dentry = ctx->dentry;
2404         struct rpc_cred *cred = ctx->cred;
2405         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2406         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2407         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2408         struct nfs4_label *olabel = NULL;
2409         int status;
2410
2411         /* Protect against reboot recovery conflicts */
2412         status = -ENOMEM;
2413         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2414         if (sp == NULL) {
2415                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2416                 goto out_err;
2417         }
2418         status = nfs4_recover_expired_lease(server);
2419         if (status != 0)
2420                 goto err_put_state_owner;
2421         if (d_really_is_positive(dentry))
2422                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2423         status = -ENOMEM;
2424         if (d_really_is_positive(dentry))
2425                 claim = NFS4_OPEN_CLAIM_FH;
2426         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2427                         label, claim, GFP_KERNEL);
2428         if (opendata == NULL)
2429                 goto err_put_state_owner;
2430
2431         if (label) {
2432                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2433                 if (IS_ERR(olabel)) {
2434                         status = PTR_ERR(olabel);
2435                         goto err_opendata_put;
2436                 }
2437         }
2438
2439         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2440                 if (!opendata->f_attr.mdsthreshold) {
2441                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2442                         if (!opendata->f_attr.mdsthreshold)
2443                                 goto err_free_label;
2444                 }
2445                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2446         }
2447         if (d_really_is_positive(dentry))
2448                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2449
2450         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2451         if (status != 0)
2452                 goto err_free_label;
2453         state = ctx->state;
2454
2455         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2456             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2457                 nfs4_exclusive_attrset(opendata, sattr, &label);
2458
2459                 nfs_fattr_init(opendata->o_res.f_attr);
2460                 status = nfs4_do_setattr(state->inode, cred,
2461                                 opendata->o_res.f_attr, sattr,
2462                                 state, label, olabel);
2463                 if (status == 0) {
2464                         nfs_setattr_update_inode(state->inode, sattr,
2465                                         opendata->o_res.f_attr);
2466                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2467                 }
2468         }
2469         if (opened && opendata->file_created)
2470                 *opened |= FILE_CREATED;
2471
2472         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2473                 *ctx_th = opendata->f_attr.mdsthreshold;
2474                 opendata->f_attr.mdsthreshold = NULL;
2475         }
2476
2477         nfs4_label_free(olabel);
2478
2479         nfs4_opendata_put(opendata);
2480         nfs4_put_state_owner(sp);
2481         return 0;
2482 err_free_label:
2483         nfs4_label_free(olabel);
2484 err_opendata_put:
2485         nfs4_opendata_put(opendata);
2486 err_put_state_owner:
2487         nfs4_put_state_owner(sp);
2488 out_err:
2489         return status;
2490 }
2491
2492
2493 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2494                                         struct nfs_open_context *ctx,
2495                                         int flags,
2496                                         struct iattr *sattr,
2497                                         struct nfs4_label *label,
2498                                         int *opened)
2499 {
2500         struct nfs_server *server = NFS_SERVER(dir);
2501         struct nfs4_exception exception = { };
2502         struct nfs4_state *res;
2503         int status;
2504
2505         do {
2506                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2507                 res = ctx->state;
2508                 trace_nfs4_open_file(ctx, flags, status);
2509                 if (status == 0)
2510                         break;
2511                 /* NOTE: BAD_SEQID means the server and client disagree about the
2512                  * book-keeping w.r.t. state-changing operations
2513                  * (OPEN/CLOSE/LOCK/LOCKU...)
2514                  * It is actually a sign of a bug on the client or on the server.
2515                  *
2516                  * If we receive a BAD_SEQID error in the particular case of
2517                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2518                  * have unhashed the old state_owner for us, and that we can
2519                  * therefore safely retry using a new one. We should still warn
2520                  * the user though...
2521                  */
2522                 if (status == -NFS4ERR_BAD_SEQID) {
2523                         pr_warn_ratelimited("NFS: v4 server %s "
2524                                         " returned a bad sequence-id error!\n",
2525                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2526                         exception.retry = 1;
2527                         continue;
2528                 }
2529                 /*
2530                  * BAD_STATEID on OPEN means that the server cancelled our
2531                  * state before it received the OPEN_CONFIRM.
2532                  * Recover by retrying the request as per the discussion
2533                  * on Page 181 of RFC3530.
2534                  */
2535                 if (status == -NFS4ERR_BAD_STATEID) {
2536                         exception.retry = 1;
2537                         continue;
2538                 }
2539                 if (status == -EAGAIN) {
2540                         /* We must have found a delegation */
2541                         exception.retry = 1;
2542                         continue;
2543                 }
2544                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2545                         continue;
2546                 res = ERR_PTR(nfs4_handle_exception(server,
2547                                         status, &exception));
2548         } while (exception.retry);
2549         return res;
2550 }
2551
2552 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2553                             struct nfs_fattr *fattr, struct iattr *sattr,
2554                             struct nfs4_state *state, struct nfs4_label *ilabel,
2555                             struct nfs4_label *olabel)
2556 {
2557         struct nfs_server *server = NFS_SERVER(inode);
2558         struct nfs_setattrargs  arg = {
2559                 .fh             = NFS_FH(inode),
2560                 .iap            = sattr,
2561                 .server         = server,
2562                 .bitmask = server->attr_bitmask,
2563                 .label          = ilabel,
2564         };
2565         struct nfs_setattrres  res = {
2566                 .fattr          = fattr,
2567                 .label          = olabel,
2568                 .server         = server,
2569         };
2570         struct rpc_message msg = {
2571                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2572                 .rpc_argp       = &arg,
2573                 .rpc_resp       = &res,
2574                 .rpc_cred       = cred,
2575         };
2576         unsigned long timestamp = jiffies;
2577         fmode_t fmode;
2578         bool truncate;
2579         int status;
2580
2581         arg.bitmask = nfs4_bitmask(server, ilabel);
2582         if (ilabel)
2583                 arg.bitmask = nfs4_bitmask(server, olabel);
2584
2585         nfs_fattr_init(fattr);
2586
2587         /* Servers should only apply open mode checks for file size changes */
2588         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2589         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2590
2591         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2592                 /* Use that stateid */
2593         } else if (truncate && state != NULL) {
2594                 struct nfs_lockowner lockowner = {
2595                         .l_owner = current->files,
2596                         .l_pid = current->tgid,
2597                 };
2598                 if (!nfs4_valid_open_stateid(state))
2599                         return -EBADF;
2600                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2601                                 &lockowner) == -EIO)
2602                         return -EBADF;
2603         } else
2604                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2605
2606         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2607         if (status == 0 && state != NULL)
2608                 renew_lease(server, timestamp);
2609         return status;
2610 }
2611
2612 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2613                            struct nfs_fattr *fattr, struct iattr *sattr,
2614                            struct nfs4_state *state, struct nfs4_label *ilabel,
2615                            struct nfs4_label *olabel)
2616 {
2617         struct nfs_server *server = NFS_SERVER(inode);
2618         struct nfs4_exception exception = {
2619                 .state = state,
2620                 .inode = inode,
2621         };
2622         int err;
2623         do {
2624                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2625                 trace_nfs4_setattr(inode, err);
2626                 switch (err) {
2627                 case -NFS4ERR_OPENMODE:
2628                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2629                                 pr_warn_once("NFSv4: server %s is incorrectly "
2630                                                 "applying open mode checks to "
2631                                                 "a SETATTR that is not "
2632                                                 "changing file size.\n",
2633                                                 server->nfs_client->cl_hostname);
2634                         }
2635                         if (state && !(state->state & FMODE_WRITE)) {
2636                                 err = -EBADF;
2637                                 if (sattr->ia_valid & ATTR_OPEN)
2638                                         err = -EACCES;
2639                                 goto out;
2640                         }
2641                 }
2642                 err = nfs4_handle_exception(server, err, &exception);
2643         } while (exception.retry);
2644 out:
2645         return err;
2646 }
2647
2648 struct nfs4_closedata {
2649         struct inode *inode;
2650         struct nfs4_state *state;
2651         struct nfs_closeargs arg;
2652         struct nfs_closeres res;
2653         struct nfs_fattr fattr;
2654         unsigned long timestamp;
2655         bool roc;
2656         u32 roc_barrier;
2657 };
2658
2659 static void nfs4_free_closedata(void *data)
2660 {
2661         struct nfs4_closedata *calldata = data;
2662         struct nfs4_state_owner *sp = calldata->state->owner;
2663         struct super_block *sb = calldata->state->inode->i_sb;
2664
2665         if (calldata->roc)
2666                 pnfs_roc_release(calldata->state->inode);
2667         nfs4_put_open_state(calldata->state);
2668         nfs_free_seqid(calldata->arg.seqid);
2669         nfs4_put_state_owner(sp);
2670         nfs_sb_deactive(sb);
2671         kfree(calldata);
2672 }
2673
2674 static void nfs4_close_done(struct rpc_task *task, void *data)
2675 {
2676         struct nfs4_closedata *calldata = data;
2677         struct nfs4_state *state = calldata->state;
2678         struct nfs_server *server = NFS_SERVER(calldata->inode);
2679         nfs4_stateid *res_stateid = NULL;
2680
2681         dprintk("%s: begin!\n", __func__);
2682         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2683                 return;
2684         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2685         /* hmm. we are done with the inode, and in the process of freeing
2686          * the state_owner. we keep this around to process errors
2687          */
2688         switch (task->tk_status) {
2689                 case 0:
2690                         res_stateid = &calldata->res.stateid;
2691                         if (calldata->roc)
2692                                 pnfs_roc_set_barrier(state->inode,
2693                                                      calldata->roc_barrier);
2694                         renew_lease(server, calldata->timestamp);
2695                         break;
2696                 case -NFS4ERR_ADMIN_REVOKED:
2697                 case -NFS4ERR_STALE_STATEID:
2698                 case -NFS4ERR_OLD_STATEID:
2699                 case -NFS4ERR_BAD_STATEID:
2700                 case -NFS4ERR_EXPIRED:
2701                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2702                                                 &state->open_stateid)) {
2703                                 rpc_restart_call_prepare(task);
2704                                 goto out_release;
2705                         }
2706                         if (calldata->arg.fmode == 0)
2707                                 break;
2708                 default:
2709                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2710                                 rpc_restart_call_prepare(task);
2711                                 goto out_release;
2712                         }
2713         }
2714         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2715                         res_stateid, calldata->arg.fmode);
2716 out_release:
2717         nfs_release_seqid(calldata->arg.seqid);
2718         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2719         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2720 }
2721
2722 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2723 {
2724         struct nfs4_closedata *calldata = data;
2725         struct nfs4_state *state = calldata->state;
2726         struct inode *inode = calldata->inode;
2727         bool is_rdonly, is_wronly, is_rdwr;
2728         int call_close = 0;
2729
2730         dprintk("%s: begin!\n", __func__);
2731         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2732                 goto out_wait;
2733
2734         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2735         spin_lock(&state->owner->so_lock);
2736         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2737         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2738         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2739         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2740         /* Calculate the change in open mode */
2741         calldata->arg.fmode = 0;
2742         if (state->n_rdwr == 0) {
2743                 if (state->n_rdonly == 0)
2744                         call_close |= is_rdonly;
2745                 else if (is_rdonly)
2746                         calldata->arg.fmode |= FMODE_READ;
2747                 if (state->n_wronly == 0)
2748                         call_close |= is_wronly;
2749                 else if (is_wronly)
2750                         calldata->arg.fmode |= FMODE_WRITE;
2751         } else if (is_rdwr)
2752                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2753
2754         if (calldata->arg.fmode == 0)
2755                 call_close |= is_rdwr;
2756
2757         if (!nfs4_valid_open_stateid(state))
2758                 call_close = 0;
2759         spin_unlock(&state->owner->so_lock);
2760
2761         if (!call_close) {
2762                 /* Note: exit _without_ calling nfs4_close_done */
2763                 goto out_no_action;
2764         }
2765
2766         if (calldata->arg.fmode == 0)
2767                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2768         if (calldata->roc)
2769                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2770
2771         calldata->arg.share_access =
2772                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2773                                 calldata->arg.fmode, 0);
2774
2775         nfs_fattr_init(calldata->res.fattr);
2776         calldata->timestamp = jiffies;
2777         if (nfs4_setup_sequence(NFS_SERVER(inode),
2778                                 &calldata->arg.seq_args,
2779                                 &calldata->res.seq_res,
2780                                 task) != 0)
2781                 nfs_release_seqid(calldata->arg.seqid);
2782         dprintk("%s: done!\n", __func__);
2783         return;
2784 out_no_action:
2785         task->tk_action = NULL;
2786 out_wait:
2787         nfs4_sequence_done(task, &calldata->res.seq_res);
2788 }
2789
2790 static const struct rpc_call_ops nfs4_close_ops = {
2791         .rpc_call_prepare = nfs4_close_prepare,
2792         .rpc_call_done = nfs4_close_done,
2793         .rpc_release = nfs4_free_closedata,
2794 };
2795
2796 static bool nfs4_roc(struct inode *inode)
2797 {
2798         if (!nfs_have_layout(inode))
2799                 return false;
2800         return pnfs_roc(inode);
2801 }
2802
2803 /*
2804  * It is possible for data to be read/written from a mem-mapped file
2805  * after the sys_close call (which hits the vfs layer as a flush).
2806  * This means that we can't safely call nfsv4 close on a file until
2807  * the inode is cleared. This in turn means that we are not good
2808  * NFSv4 citizens - we do not indicate to the server to update the file's
2809  * share state even when we are done with one of the three share
2810  * stateid's in the inode.
2811  *
2812  * NOTE: Caller must be holding the sp->so_owner semaphore!
2813  */
2814 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2815 {
2816         struct nfs_server *server = NFS_SERVER(state->inode);
2817         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2818         struct nfs4_closedata *calldata;
2819         struct nfs4_state_owner *sp = state->owner;
2820         struct rpc_task *task;
2821         struct rpc_message msg = {
2822                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2823                 .rpc_cred = state->owner->so_cred,
2824         };
2825         struct rpc_task_setup task_setup_data = {
2826                 .rpc_client = server->client,
2827                 .rpc_message = &msg,
2828                 .callback_ops = &nfs4_close_ops,
2829                 .workqueue = nfsiod_workqueue,
2830                 .flags = RPC_TASK_ASYNC,
2831         };
2832         int status = -ENOMEM;
2833
2834         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2835                 &task_setup_data.rpc_client, &msg);
2836
2837         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2838         if (calldata == NULL)
2839                 goto out;
2840         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2841         calldata->inode = state->inode;
2842         calldata->state = state;
2843         calldata->arg.fh = NFS_FH(state->inode);
2844         /* Serialization for the sequence id */
2845         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2846         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2847         if (IS_ERR(calldata->arg.seqid))
2848                 goto out_free_calldata;
2849         calldata->arg.fmode = 0;
2850         calldata->arg.bitmask = server->cache_consistency_bitmask;
2851         calldata->res.fattr = &calldata->fattr;
2852         calldata->res.seqid = calldata->arg.seqid;
2853         calldata->res.server = server;
2854         calldata->roc = nfs4_roc(state->inode);
2855         nfs_sb_active(calldata->inode->i_sb);
2856
2857         msg.rpc_argp = &calldata->arg;
2858         msg.rpc_resp = &calldata->res;
2859         task_setup_data.callback_data = calldata;
2860         task = rpc_run_task(&task_setup_data);
2861         if (IS_ERR(task))
2862                 return PTR_ERR(task);
2863         status = 0;
2864         if (wait)
2865                 status = rpc_wait_for_completion_task(task);
2866         rpc_put_task(task);
2867         return status;
2868 out_free_calldata:
2869         kfree(calldata);
2870 out:
2871         nfs4_put_open_state(state);
2872         nfs4_put_state_owner(sp);
2873         return status;
2874 }
2875
2876 static struct inode *
2877 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2878                 int open_flags, struct iattr *attr, int *opened)
2879 {
2880         struct nfs4_state *state;
2881         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2882
2883         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2884
2885         /* Protect against concurrent sillydeletes */
2886         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2887
2888         nfs4_label_release_security(label);
2889
2890         if (IS_ERR(state))
2891                 return ERR_CAST(state);
2892         return state->inode;
2893 }
2894
2895 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2896 {
2897         if (ctx->state == NULL)
2898                 return;
2899         if (is_sync)
2900                 nfs4_close_sync(ctx->state, ctx->mode);
2901         else
2902                 nfs4_close_state(ctx->state, ctx->mode);
2903 }
2904
2905 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2906 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2907 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2908
2909 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2910 {
2911         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
2912         struct nfs4_server_caps_arg args = {
2913                 .fhandle = fhandle,
2914                 .bitmask = bitmask,
2915         };
2916         struct nfs4_server_caps_res res = {};
2917         struct rpc_message msg = {
2918                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2919                 .rpc_argp = &args,
2920                 .rpc_resp = &res,
2921         };
2922         int status;
2923
2924         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
2925                      FATTR4_WORD0_FH_EXPIRE_TYPE |
2926                      FATTR4_WORD0_LINK_SUPPORT |
2927                      FATTR4_WORD0_SYMLINK_SUPPORT |
2928                      FATTR4_WORD0_ACLSUPPORT;
2929         if (minorversion)
2930                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
2931
2932         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2933         if (status == 0) {
2934                 /* Sanity check the server answers */
2935                 switch (minorversion) {
2936                 case 0:
2937                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2938                         res.attr_bitmask[2] = 0;
2939                         break;
2940                 case 1:
2941                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2942                         break;
2943                 case 2:
2944                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2945                 }
2946                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2947                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2948                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2949                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2950                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2951                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2952                                 NFS_CAP_SECURITY_LABEL);
2953                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2954                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2955                         server->caps |= NFS_CAP_ACLS;
2956                 if (res.has_links != 0)
2957                         server->caps |= NFS_CAP_HARDLINKS;
2958                 if (res.has_symlinks != 0)
2959                         server->caps |= NFS_CAP_SYMLINKS;
2960                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2961                         server->caps |= NFS_CAP_FILEID;
2962                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2963                         server->caps |= NFS_CAP_MODE;
2964                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2965                         server->caps |= NFS_CAP_NLINK;
2966                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2967                         server->caps |= NFS_CAP_OWNER;
2968                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2969                         server->caps |= NFS_CAP_OWNER_GROUP;
2970                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2971                         server->caps |= NFS_CAP_ATIME;
2972                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2973                         server->caps |= NFS_CAP_CTIME;
2974                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2975                         server->caps |= NFS_CAP_MTIME;
2976 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2977                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2978                         server->caps |= NFS_CAP_SECURITY_LABEL;
2979 #endif
2980                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2981                                 sizeof(server->attr_bitmask));
2982                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2983
2984                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2985                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2986                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2987                 server->cache_consistency_bitmask[2] = 0;
2988                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
2989                         sizeof(server->exclcreat_bitmask));
2990                 server->acl_bitmask = res.acl_bitmask;
2991                 server->fh_expire_type = res.fh_expire_type;
2992         }
2993
2994         return status;
2995 }
2996
2997 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2998 {
2999         struct nfs4_exception exception = { };
3000         int err;
3001         do {
3002                 err = nfs4_handle_exception(server,
3003                                 _nfs4_server_capabilities(server, fhandle),
3004                                 &exception);
3005         } while (exception.retry);
3006         return err;
3007 }
3008
3009 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3010                 struct nfs_fsinfo *info)
3011 {
3012         u32 bitmask[3];
3013         struct nfs4_lookup_root_arg args = {
3014                 .bitmask = bitmask,
3015         };
3016         struct nfs4_lookup_res res = {
3017                 .server = server,
3018                 .fattr = info->fattr,
3019                 .fh = fhandle,
3020         };
3021         struct rpc_message msg = {
3022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3023                 .rpc_argp = &args,
3024                 .rpc_resp = &res,
3025         };
3026
3027         bitmask[0] = nfs4_fattr_bitmap[0];
3028         bitmask[1] = nfs4_fattr_bitmap[1];
3029         /*
3030          * Process the label in the upcoming getfattr
3031          */
3032         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3033
3034         nfs_fattr_init(info->fattr);
3035         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3036 }
3037
3038 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3039                 struct nfs_fsinfo *info)
3040 {
3041         struct nfs4_exception exception = { };
3042         int err;
3043         do {
3044                 err = _nfs4_lookup_root(server, fhandle, info);
3045                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3046                 switch (err) {
3047                 case 0:
3048                 case -NFS4ERR_WRONGSEC:
3049                         goto out;
3050                 default:
3051                         err = nfs4_handle_exception(server, err, &exception);
3052                 }
3053         } while (exception.retry);
3054 out:
3055         return err;
3056 }
3057
3058 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3059                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3060 {
3061         struct rpc_auth_create_args auth_args = {
3062                 .pseudoflavor = flavor,
3063         };
3064         struct rpc_auth *auth;
3065         int ret;
3066
3067         auth = rpcauth_create(&auth_args, server->client);
3068         if (IS_ERR(auth)) {
3069                 ret = -EACCES;
3070                 goto out;
3071         }
3072         ret = nfs4_lookup_root(server, fhandle, info);
3073 out:
3074         return ret;
3075 }
3076
3077 /*
3078  * Retry pseudoroot lookup with various security flavors.  We do this when:
3079  *
3080  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3081  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3082  *
3083  * Returns zero on success, or a negative NFS4ERR value, or a
3084  * negative errno value.
3085  */
3086 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3087                               struct nfs_fsinfo *info)
3088 {
3089         /* Per 3530bis 15.33.5 */
3090         static const rpc_authflavor_t flav_array[] = {
3091                 RPC_AUTH_GSS_KRB5P,
3092                 RPC_AUTH_GSS_KRB5I,
3093                 RPC_AUTH_GSS_KRB5,
3094                 RPC_AUTH_UNIX,                  /* courtesy */
3095                 RPC_AUTH_NULL,
3096         };
3097         int status = -EPERM;
3098         size_t i;
3099
3100         if (server->auth_info.flavor_len > 0) {
3101                 /* try each flavor specified by user */
3102                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3103                         status = nfs4_lookup_root_sec(server, fhandle, info,
3104                                                 server->auth_info.flavors[i]);
3105                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3106                                 continue;
3107                         break;
3108                 }
3109         } else {
3110                 /* no flavors specified by user, try default list */
3111                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3112                         status = nfs4_lookup_root_sec(server, fhandle, info,
3113                                                       flav_array[i]);
3114                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3115                                 continue;
3116                         break;
3117                 }
3118         }
3119
3120         /*
3121          * -EACCESS could mean that the user doesn't have correct permissions
3122          * to access the mount.  It could also mean that we tried to mount
3123          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3124          * existing mount programs don't handle -EACCES very well so it should
3125          * be mapped to -EPERM instead.
3126          */
3127         if (status == -EACCES)
3128                 status = -EPERM;
3129         return status;
3130 }
3131
3132 static int nfs4_do_find_root_sec(struct nfs_server *server,
3133                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3134 {
3135         int mv = server->nfs_client->cl_minorversion;
3136         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3137 }
3138
3139 /**
3140  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3141  * @server: initialized nfs_server handle
3142  * @fhandle: we fill in the pseudo-fs root file handle
3143  * @info: we fill in an FSINFO struct
3144  * @auth_probe: probe the auth flavours
3145  *
3146  * Returns zero on success, or a negative errno.
3147  */
3148 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3149                          struct nfs_fsinfo *info,
3150                          bool auth_probe)
3151 {
3152         int status = 0;
3153
3154         if (!auth_probe)
3155                 status = nfs4_lookup_root(server, fhandle, info);
3156
3157         if (auth_probe || status == NFS4ERR_WRONGSEC)
3158                 status = nfs4_do_find_root_sec(server, fhandle, info);
3159
3160         if (status == 0)
3161                 status = nfs4_server_capabilities(server, fhandle);
3162         if (status == 0)
3163                 status = nfs4_do_fsinfo(server, fhandle, info);
3164
3165         return nfs4_map_errors(status);
3166 }
3167
3168 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3169                               struct nfs_fsinfo *info)
3170 {
3171         int error;
3172         struct nfs_fattr *fattr = info->fattr;
3173         struct nfs4_label *label = NULL;
3174
3175         error = nfs4_server_capabilities(server, mntfh);
3176         if (error < 0) {
3177                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3178                 return error;
3179         }
3180
3181         label = nfs4_label_alloc(server, GFP_KERNEL);
3182         if (IS_ERR(label))
3183                 return PTR_ERR(label);
3184
3185         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3186         if (error < 0) {
3187                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3188                 goto err_free_label;
3189         }
3190
3191         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3192             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3193                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3194
3195 err_free_label:
3196         nfs4_label_free(label);
3197
3198         return error;
3199 }
3200
3201 /*
3202  * Get locations and (maybe) other attributes of a referral.
3203  * Note that we'll actually follow the referral later when
3204  * we detect fsid mismatch in inode revalidation
3205  */
3206 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3207                              const struct qstr *name, struct nfs_fattr *fattr,
3208                              struct nfs_fh *fhandle)
3209 {
3210         int status = -ENOMEM;
3211         struct page *page = NULL;
3212         struct nfs4_fs_locations *locations = NULL;
3213
3214         page = alloc_page(GFP_KERNEL);
3215         if (page == NULL)
3216                 goto out;
3217         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3218         if (locations == NULL)
3219                 goto out;
3220
3221         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3222         if (status != 0)
3223                 goto out;
3224
3225         /*
3226          * If the fsid didn't change, this is a migration event, not a
3227          * referral.  Cause us to drop into the exception handler, which
3228          * will kick off migration recovery.
3229          */
3230         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3231                 dprintk("%s: server did not return a different fsid for"
3232                         " a referral at %s\n", __func__, name->name);
3233                 status = -NFS4ERR_MOVED;
3234                 goto out;
3235         }
3236         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3237         nfs_fixup_referral_attributes(&locations->fattr);
3238
3239         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3240         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3241         memset(fhandle, 0, sizeof(struct nfs_fh));
3242 out:
3243         if (page)
3244                 __free_page(page);
3245         kfree(locations);
3246         return status;
3247 }
3248
3249 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3250                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3251 {
3252         struct nfs4_getattr_arg args = {
3253                 .fh = fhandle,
3254                 .bitmask = server->attr_bitmask,
3255         };
3256         struct nfs4_getattr_res res = {
3257                 .fattr = fattr,
3258                 .label = label,
3259                 .server = server,
3260         };
3261         struct rpc_message msg = {
3262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3263                 .rpc_argp = &args,
3264                 .rpc_resp = &res,
3265         };
3266
3267         args.bitmask = nfs4_bitmask(server, label);
3268
3269         nfs_fattr_init(fattr);
3270         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3271 }
3272
3273 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3274                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3275 {
3276         struct nfs4_exception exception = { };
3277         int err;
3278         do {
3279                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3280                 trace_nfs4_getattr(server, fhandle, fattr, err);
3281                 err = nfs4_handle_exception(server, err,
3282                                 &exception);
3283         } while (exception.retry);
3284         return err;
3285 }
3286
3287 /*
3288  * The file is not closed if it is opened due to the a request to change
3289  * the size of the file. The open call will not be needed once the
3290  * VFS layer lookup-intents are implemented.
3291  *
3292  * Close is called when the inode is destroyed.
3293  * If we haven't opened the file for O_WRONLY, we
3294  * need to in the size_change case to obtain a stateid.
3295  *
3296  * Got race?
3297  * Because OPEN is always done by name in nfsv4, it is
3298  * possible that we opened a different file by the same
3299  * name.  We can recognize this race condition, but we
3300  * can't do anything about it besides returning an error.
3301  *
3302  * This will be fixed with VFS changes (lookup-intent).
3303  */
3304 static int
3305 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3306                   struct iattr *sattr)
3307 {
3308         struct inode *inode = d_inode(dentry);
3309         struct rpc_cred *cred = NULL;
3310         struct nfs4_state *state = NULL;
3311         struct nfs4_label *label = NULL;
3312         int status;
3313
3314         if (pnfs_ld_layoutret_on_setattr(inode) &&
3315             sattr->ia_valid & ATTR_SIZE &&
3316             sattr->ia_size < i_size_read(inode))
3317                 pnfs_commit_and_return_layout(inode);
3318
3319         nfs_fattr_init(fattr);
3320
3321         /* Deal with open(O_TRUNC) */
3322         if (sattr->ia_valid & ATTR_OPEN)
3323                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3324
3325         /* Optimization: if the end result is no change, don't RPC */
3326         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3327                 return 0;
3328
3329         /* Search for an existing open(O_WRITE) file */
3330         if (sattr->ia_valid & ATTR_FILE) {
3331                 struct nfs_open_context *ctx;
3332
3333                 ctx = nfs_file_open_context(sattr->ia_file);
3334                 if (ctx) {
3335                         cred = ctx->cred;
3336                         state = ctx->state;
3337                 }
3338         }
3339
3340         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3341         if (IS_ERR(label))
3342                 return PTR_ERR(label);
3343
3344         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3345         if (status == 0) {
3346                 nfs_setattr_update_inode(inode, sattr, fattr);
3347                 nfs_setsecurity(inode, fattr, label);
3348         }
3349         nfs4_label_free(label);
3350         return status;
3351 }
3352
3353 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3354                 const struct qstr *name, struct nfs_fh *fhandle,
3355                 struct nfs_fattr *fattr, struct nfs4_label *label)
3356 {
3357         struct nfs_server *server = NFS_SERVER(dir);
3358         int                    status;
3359         struct nfs4_lookup_arg args = {
3360                 .bitmask = server->attr_bitmask,
3361                 .dir_fh = NFS_FH(dir),
3362                 .name = name,
3363         };
3364         struct nfs4_lookup_res res = {
3365                 .server = server,
3366                 .fattr = fattr,
3367                 .label = label,
3368                 .fh = fhandle,
3369         };
3370         struct rpc_message msg = {
3371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3372                 .rpc_argp = &args,
3373                 .rpc_resp = &res,
3374         };
3375
3376         args.bitmask = nfs4_bitmask(server, label);
3377
3378         nfs_fattr_init(fattr);
3379
3380         dprintk("NFS call  lookup %s\n", name->name);
3381         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3382         dprintk("NFS reply lookup: %d\n", status);
3383         return status;
3384 }
3385
3386 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3387 {
3388         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3389                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3390         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3391         fattr->nlink = 2;
3392 }
3393
3394 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3395                                    struct qstr *name, struct nfs_fh *fhandle,
3396                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3397 {
3398         struct nfs4_exception exception = { };
3399         struct rpc_clnt *client = *clnt;
3400         int err;
3401         do {
3402                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3403                 trace_nfs4_lookup(dir, name, err);
3404                 switch (err) {
3405                 case -NFS4ERR_BADNAME:
3406                         err = -ENOENT;
3407                         goto out;
3408                 case -NFS4ERR_MOVED:
3409                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3410                         if (err == -NFS4ERR_MOVED)
3411                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3412                         goto out;
3413                 case -NFS4ERR_WRONGSEC:
3414                         err = -EPERM;
3415                         if (client != *clnt)
3416                                 goto out;
3417                         client = nfs4_negotiate_security(client, dir, name);
3418                         if (IS_ERR(client))
3419                                 return PTR_ERR(client);
3420
3421                         exception.retry = 1;
3422                         break;
3423                 default:
3424                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3425                 }
3426         } while (exception.retry);
3427
3428 out:
3429         if (err == 0)
3430                 *clnt = client;
3431         else if (client != *clnt)
3432                 rpc_shutdown_client(client);
3433
3434         return err;
3435 }
3436
3437 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3438                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3439                             struct nfs4_label *label)
3440 {
3441         int status;
3442         struct rpc_clnt *client = NFS_CLIENT(dir);
3443
3444         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3445         if (client != NFS_CLIENT(dir)) {
3446                 rpc_shutdown_client(client);
3447                 nfs_fixup_secinfo_attributes(fattr);
3448         }
3449         return status;
3450 }
3451
3452 struct rpc_clnt *
3453 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3454                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3455 {
3456         struct rpc_clnt *client = NFS_CLIENT(dir);
3457         int status;
3458
3459         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3460         if (status < 0)
3461                 return ERR_PTR(status);
3462         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3463 }
3464
3465 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3466 {
3467         struct nfs_server *server = NFS_SERVER(inode);
3468         struct nfs4_accessargs args = {
3469                 .fh = NFS_FH(inode),
3470                 .bitmask = server->cache_consistency_bitmask,
3471         };
3472         struct nfs4_accessres res = {
3473                 .server = server,
3474         };
3475         struct rpc_message msg = {
3476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3477                 .rpc_argp = &args,
3478                 .rpc_resp = &res,
3479                 .rpc_cred = entry->cred,
3480         };
3481         int mode = entry->mask;
3482         int status = 0;
3483
3484         /*
3485          * Determine which access bits we want to ask for...
3486          */
3487         if (mode & MAY_READ)
3488                 args.access |= NFS4_ACCESS_READ;
3489         if (S_ISDIR(inode->i_mode)) {
3490                 if (mode & MAY_WRITE)
3491                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3492                 if (mode & MAY_EXEC)
3493                         args.access |= NFS4_ACCESS_LOOKUP;
3494         } else {
3495                 if (mode & MAY_WRITE)
3496                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3497                 if (mode & MAY_EXEC)
3498                         args.access |= NFS4_ACCESS_EXECUTE;
3499         }
3500
3501         res.fattr = nfs_alloc_fattr();
3502         if (res.fattr == NULL)
3503                 return -ENOMEM;
3504
3505         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3506         if (!status) {
3507                 nfs_access_set_mask(entry, res.access);
3508                 nfs_refresh_inode(inode, res.fattr);
3509         }
3510         nfs_free_fattr(res.fattr);
3511         return status;
3512 }
3513
3514 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3515 {
3516         struct nfs4_exception exception = { };
3517         int err;
3518         do {
3519                 err = _nfs4_proc_access(inode, entry);
3520                 trace_nfs4_access(inode, err);
3521                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3522                                 &exception);
3523         } while (exception.retry);
3524         return err;
3525 }
3526
3527 /*
3528  * TODO: For the time being, we don't try to get any attributes
3529  * along with any of the zero-copy operations READ, READDIR,
3530  * READLINK, WRITE.
3531  *
3532  * In the case of the first three, we want to put the GETATTR
3533  * after the read-type operation -- this is because it is hard
3534  * to predict the length of a GETATTR response in v4, and thus
3535  * align the READ data correctly.  This means that the GETATTR
3536  * may end up partially falling into the page cache, and we should
3537  * shift it into the 'tail' of the xdr_buf before processing.
3538  * To do this efficiently, we need to know the total length
3539  * of data received, which doesn't seem to be available outside
3540  * of the RPC layer.
3541  *
3542  * In the case of WRITE, we also want to put the GETATTR after
3543  * the operation -- in this case because we want to make sure
3544  * we get the post-operation mtime and size.
3545  *
3546  * Both of these changes to the XDR layer would in fact be quite
3547  * minor, but I decided to leave them for a subsequent patch.
3548  */
3549 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3550                 unsigned int pgbase, unsigned int pglen)
3551 {
3552         struct nfs4_readlink args = {
3553                 .fh       = NFS_FH(inode),
3554                 .pgbase   = pgbase,
3555                 .pglen    = pglen,
3556                 .pages    = &page,
3557         };
3558         struct nfs4_readlink_res res;
3559         struct rpc_message msg = {
3560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3561                 .rpc_argp = &args,
3562                 .rpc_resp = &res,
3563         };
3564
3565         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3566 }
3567
3568 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3569                 unsigned int pgbase, unsigned int pglen)
3570 {
3571         struct nfs4_exception exception = { };
3572         int err;
3573         do {
3574                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3575                 trace_nfs4_readlink(inode, err);
3576                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3577                                 &exception);
3578         } while (exception.retry);
3579         return err;
3580 }
3581
3582 /*
3583  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3584  */
3585 static int
3586 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3587                  int flags)
3588 {
3589         struct nfs4_label l, *ilabel = NULL;
3590         struct nfs_open_context *ctx;
3591         struct nfs4_state *state;
3592         int status = 0;
3593
3594         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3595         if (IS_ERR(ctx))
3596                 return PTR_ERR(ctx);
3597
3598         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3599
3600         sattr->ia_mode &= ~current_umask();
3601         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3602         if (IS_ERR(state)) {
3603                 status = PTR_ERR(state);
3604                 goto out;
3605         }
3606 out:
3607         nfs4_label_release_security(ilabel);
3608         put_nfs_open_context(ctx);
3609         return status;
3610 }
3611
3612 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3613 {
3614         struct nfs_server *server = NFS_SERVER(dir);
3615         struct nfs_removeargs args = {
3616                 .fh = NFS_FH(dir),
3617                 .name = *name,
3618         };
3619         struct nfs_removeres res = {
3620                 .server = server,
3621         };
3622         struct rpc_message msg = {
3623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3624                 .rpc_argp = &args,
3625                 .rpc_resp = &res,
3626         };
3627         int status;
3628
3629         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3630         if (status == 0)
3631                 update_changeattr(dir, &res.cinfo);
3632         return status;
3633 }
3634
3635 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3636 {
3637         struct nfs4_exception exception = { };
3638         int err;
3639         do {
3640                 err = _nfs4_proc_remove(dir, name);
3641                 trace_nfs4_remove(dir, name, err);
3642                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3643                                 &exception);
3644         } while (exception.retry);
3645         return err;
3646 }
3647
3648 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3649 {
3650         struct nfs_server *server = NFS_SERVER(dir);
3651         struct nfs_removeargs *args = msg->rpc_argp;
3652         struct nfs_removeres *res = msg->rpc_resp;
3653
3654         res->server = server;
3655         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3656         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3657
3658         nfs_fattr_init(res->dir_attr);
3659 }
3660
3661 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3662 {
3663         nfs4_setup_sequence(NFS_SERVER(data->dir),
3664                         &data->args.seq_args,
3665                         &data->res.seq_res,
3666                         task);
3667 }
3668
3669 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3670 {
3671         struct nfs_unlinkdata *data = task->tk_calldata;
3672         struct nfs_removeres *res = &data->res;
3673
3674         if (!nfs4_sequence_done(task, &res->seq_res))
3675                 return 0;
3676         if (nfs4_async_handle_error(task, res->server, NULL,
3677                                     &data->timeout) == -EAGAIN)
3678                 return 0;
3679         update_changeattr(dir, &res->cinfo);
3680         return 1;
3681 }
3682
3683 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3684 {
3685         struct nfs_server *server = NFS_SERVER(dir);
3686         struct nfs_renameargs *arg = msg->rpc_argp;
3687         struct nfs_renameres *res = msg->rpc_resp;
3688
3689         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3690         res->server = server;
3691         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3692 }
3693
3694 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3695 {
3696         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3697                         &data->args.seq_args,
3698                         &data->res.seq_res,
3699                         task);
3700 }
3701
3702 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3703                                  struct inode *new_dir)
3704 {
3705         struct nfs_renamedata *data = task->tk_calldata;
3706         struct nfs_renameres *res = &data->res;
3707
3708         if (!nfs4_sequence_done(task, &res->seq_res))
3709                 return 0;
3710         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3711                 return 0;
3712
3713         update_changeattr(old_dir, &res->old_cinfo);
3714         update_changeattr(new_dir, &res->new_cinfo);
3715         return 1;
3716 }
3717
3718 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3719 {
3720         struct nfs_server *server = NFS_SERVER(inode);
3721         struct nfs4_link_arg arg = {
3722                 .fh     = NFS_FH(inode),
3723                 .dir_fh = NFS_FH(dir),
3724                 .name   = name,
3725                 .bitmask = server->attr_bitmask,
3726         };
3727         struct nfs4_link_res res = {
3728                 .server = server,
3729                 .label = NULL,
3730         };
3731         struct rpc_message msg = {
3732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3733                 .rpc_argp = &arg,
3734                 .rpc_resp = &res,
3735         };
3736         int status = -ENOMEM;
3737
3738         res.fattr = nfs_alloc_fattr();
3739         if (res.fattr == NULL)
3740                 goto out;
3741
3742         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3743         if (IS_ERR(res.label)) {
3744                 status = PTR_ERR(res.label);
3745                 goto out;
3746         }
3747         arg.bitmask = nfs4_bitmask(server, res.label);
3748
3749         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3750         if (!status) {
3751                 update_changeattr(dir, &res.cinfo);
3752                 status = nfs_post_op_update_inode(inode, res.fattr);
3753                 if (!status)
3754                         nfs_setsecurity(inode, res.fattr, res.label);
3755         }
3756
3757
3758         nfs4_label_free(res.label);
3759
3760 out:
3761         nfs_free_fattr(res.fattr);
3762         return status;
3763 }
3764
3765 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3766 {
3767         struct nfs4_exception exception = { };
3768         int err;
3769         do {
3770                 err = nfs4_handle_exception(NFS_SERVER(inode),
3771                                 _nfs4_proc_link(inode, dir, name),
3772                                 &exception);
3773         } while (exception.retry);
3774         return err;
3775 }
3776
3777 struct nfs4_createdata {
3778         struct rpc_message msg;
3779         struct nfs4_create_arg arg;
3780         struct nfs4_create_res res;
3781         struct nfs_fh fh;
3782         struct nfs_fattr fattr;
3783         struct nfs4_label *label;
3784 };
3785
3786 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3787                 struct qstr *name, struct iattr *sattr, u32 ftype)
3788 {
3789         struct nfs4_createdata *data;
3790
3791         data = kzalloc(sizeof(*data), GFP_KERNEL);
3792         if (data != NULL) {
3793                 struct nfs_server *server = NFS_SERVER(dir);
3794
3795                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3796                 if (IS_ERR(data->label))
3797                         goto out_free;
3798
3799                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3800                 data->msg.rpc_argp = &data->arg;
3801                 data->msg.rpc_resp = &data->res;
3802                 data->arg.dir_fh = NFS_FH(dir);
3803                 data->arg.server = server;
3804                 data->arg.name = name;
3805                 data->arg.attrs = sattr;
3806                 data->arg.ftype = ftype;
3807                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3808                 data->res.server = server;
3809                 data->res.fh = &data->fh;
3810                 data->res.fattr = &data->fattr;
3811                 data->res.label = data->label;
3812                 nfs_fattr_init(data->res.fattr);
3813         }
3814         return data;
3815 out_free:
3816         kfree(data);
3817         return NULL;
3818 }
3819
3820 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3821 {
3822         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3823                                     &data->arg.seq_args, &data->res.seq_res, 1);
3824         if (status == 0) {
3825                 update_changeattr(dir, &data->res.dir_cinfo);
3826                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3827         }
3828         return status;
3829 }
3830
3831 static void nfs4_free_createdata(struct nfs4_createdata *data)
3832 {
3833         nfs4_label_free(data->label);
3834         kfree(data);
3835 }
3836
3837 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3838                 struct page *page, unsigned int len, struct iattr *sattr,
3839                 struct nfs4_label *label)
3840 {
3841         struct nfs4_createdata *data;
3842         int status = -ENAMETOOLONG;
3843
3844         if (len > NFS4_MAXPATHLEN)
3845                 goto out;
3846
3847         status = -ENOMEM;
3848         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3849         if (data == NULL)
3850                 goto out;
3851
3852         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3853         data->arg.u.symlink.pages = &page;
3854         data->arg.u.symlink.len = len;
3855         data->arg.label = label;
3856
3857         status = nfs4_do_create(dir, dentry, data);
3858
3859         nfs4_free_createdata(data);
3860 out:
3861         return status;
3862 }
3863
3864 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3865                 struct page *page, unsigned int len, struct iattr *sattr)
3866 {
3867         struct nfs4_exception exception = { };
3868         struct nfs4_label l, *label = NULL;
3869         int err;
3870
3871         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3872
3873         do {
3874                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3875                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3876                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3877                                 &exception);
3878         } while (exception.retry);
3879
3880         nfs4_label_release_security(label);
3881         return err;
3882 }
3883
3884 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3885                 struct iattr *sattr, struct nfs4_label *label)
3886 {
3887         struct nfs4_createdata *data;
3888         int status = -ENOMEM;
3889
3890         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3891         if (data == NULL)
3892                 goto out;
3893
3894         data->arg.label = label;
3895         status = nfs4_do_create(dir, dentry, data);
3896
3897         nfs4_free_createdata(data);
3898 out:
3899         return status;
3900 }
3901
3902 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3903                 struct iattr *sattr)
3904 {
3905         struct nfs4_exception exception = { };
3906         struct nfs4_label l, *label = NULL;
3907         int err;
3908
3909         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3910
3911         sattr->ia_mode &= ~current_umask();
3912         do {
3913                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3914                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3915                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3916                                 &exception);
3917         } while (exception.retry);
3918         nfs4_label_release_security(label);
3919
3920         return err;
3921 }
3922
3923 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3924                 u64 cookie, struct page **pages, unsigned int count, int plus)
3925 {
3926         struct inode            *dir = d_inode(dentry);
3927         struct nfs4_readdir_arg args = {
3928                 .fh = NFS_FH(dir),
3929                 .pages = pages,
3930                 .pgbase = 0,
3931                 .count = count,
3932                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
3933                 .plus = plus,
3934         };
3935         struct nfs4_readdir_res res;
3936         struct rpc_message msg = {
3937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3938                 .rpc_argp = &args,
3939                 .rpc_resp = &res,
3940                 .rpc_cred = cred,
3941         };
3942         int                     status;
3943
3944         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3945                         dentry,
3946                         (unsigned long long)cookie);
3947         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3948         res.pgbase = args.pgbase;
3949         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3950         if (status >= 0) {
3951                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3952                 status += args.pgbase;
3953         }
3954
3955         nfs_invalidate_atime(dir);
3956
3957         dprintk("%s: returns %d\n", __func__, status);
3958         return status;
3959 }
3960
3961 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3962                 u64 cookie, struct page **pages, unsigned int count, int plus)
3963 {
3964         struct nfs4_exception exception = { };
3965         int err;
3966         do {
3967                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3968                                 pages, count, plus);
3969                 trace_nfs4_readdir(d_inode(dentry), err);
3970                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
3971                                 &exception);
3972         } while (exception.retry);
3973         return err;
3974 }
3975
3976 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3977                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3978 {
3979         struct nfs4_createdata *data;
3980         int mode = sattr->ia_mode;
3981         int status = -ENOMEM;
3982
3983         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3984         if (data == NULL)
3985                 goto out;
3986
3987         if (S_ISFIFO(mode))
3988                 data->arg.ftype = NF4FIFO;
3989         else if (S_ISBLK(mode)) {
3990                 data->arg.ftype = NF4BLK;
3991                 data->arg.u.device.specdata1 = MAJOR(rdev);
3992                 data->arg.u.device.specdata2 = MINOR(rdev);
3993         }
3994         else if (S_ISCHR(mode)) {
3995                 data->arg.ftype = NF4CHR;
3996                 data->arg.u.device.specdata1 = MAJOR(rdev);
3997                 data->arg.u.device.specdata2 = MINOR(rdev);
3998         } else if (!S_ISSOCK(mode)) {
3999                 status = -EINVAL;
4000                 goto out_free;
4001         }
4002
4003         data->arg.label = label;
4004         status = nfs4_do_create(dir, dentry, data);
4005 out_free:
4006         nfs4_free_createdata(data);
4007 out:
4008         return status;
4009 }
4010
4011 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4012                 struct iattr *sattr, dev_t rdev)
4013 {
4014         struct nfs4_exception exception = { };
4015         struct nfs4_label l, *label = NULL;
4016         int err;
4017
4018         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4019
4020         sattr->ia_mode &= ~current_umask();
4021         do {
4022                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4023                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4024                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4025                                 &exception);
4026         } while (exception.retry);
4027
4028         nfs4_label_release_security(label);
4029
4030         return err;
4031 }
4032
4033 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4034                  struct nfs_fsstat *fsstat)
4035 {
4036         struct nfs4_statfs_arg args = {
4037                 .fh = fhandle,
4038                 .bitmask = server->attr_bitmask,
4039         };
4040         struct nfs4_statfs_res res = {
4041                 .fsstat = fsstat,
4042         };
4043         struct rpc_message msg = {
4044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4045                 .rpc_argp = &args,
4046                 .rpc_resp = &res,
4047         };
4048
4049         nfs_fattr_init(fsstat->fattr);
4050         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4051 }
4052
4053 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4054 {
4055         struct nfs4_exception exception = { };
4056         int err;
4057         do {
4058                 err = nfs4_handle_exception(server,
4059                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4060                                 &exception);
4061         } while (exception.retry);
4062         return err;
4063 }
4064
4065 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4066                 struct nfs_fsinfo *fsinfo)
4067 {
4068         struct nfs4_fsinfo_arg args = {
4069                 .fh = fhandle,
4070                 .bitmask = server->attr_bitmask,
4071         };
4072         struct nfs4_fsinfo_res res = {
4073                 .fsinfo = fsinfo,
4074         };
4075         struct rpc_message msg = {
4076                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4077                 .rpc_argp = &args,
4078                 .rpc_resp = &res,
4079         };
4080
4081         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4082 }
4083
4084 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4085 {
4086         struct nfs4_exception exception = { };
4087         unsigned long now = jiffies;
4088         int err;
4089
4090         do {
4091                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4092                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4093                 if (err == 0) {
4094                         struct nfs_client *clp = server->nfs_client;
4095
4096                         spin_lock(&clp->cl_lock);
4097                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4098                         clp->cl_last_renewal = now;
4099                         spin_unlock(&clp->cl_lock);
4100                         break;
4101                 }
4102                 err = nfs4_handle_exception(server, err, &exception);
4103         } while (exception.retry);
4104         return err;
4105 }
4106
4107 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4108 {
4109         int error;
4110
4111         nfs_fattr_init(fsinfo->fattr);
4112         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4113         if (error == 0) {
4114                 /* block layout checks this! */
4115                 server->pnfs_blksize = fsinfo->blksize;
4116                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4117         }
4118
4119         return error;
4120 }
4121
4122 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4123                 struct nfs_pathconf *pathconf)
4124 {
4125         struct nfs4_pathconf_arg args = {
4126                 .fh = fhandle,
4127                 .bitmask = server->attr_bitmask,
4128         };
4129         struct nfs4_pathconf_res res = {
4130                 .pathconf = pathconf,
4131         };
4132         struct rpc_message msg = {
4133                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4134                 .rpc_argp = &args,
4135                 .rpc_resp = &res,
4136         };
4137
4138         /* None of the pathconf attributes are mandatory to implement */
4139         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4140                 memset(pathconf, 0, sizeof(*pathconf));
4141                 return 0;
4142         }
4143
4144         nfs_fattr_init(pathconf->fattr);
4145         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4146 }
4147
4148 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4149                 struct nfs_pathconf *pathconf)
4150 {
4151         struct nfs4_exception exception = { };
4152         int err;
4153
4154         do {
4155                 err = nfs4_handle_exception(server,
4156                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4157                                 &exception);
4158         } while (exception.retry);
4159         return err;
4160 }
4161
4162 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4163                 const struct nfs_open_context *ctx,
4164                 const struct nfs_lock_context *l_ctx,
4165                 fmode_t fmode)
4166 {
4167         const struct nfs_lockowner *lockowner = NULL;
4168
4169         if (l_ctx != NULL)
4170                 lockowner = &l_ctx->lockowner;
4171         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4172 }
4173 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4174
4175 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4176                 const struct nfs_open_context *ctx,
4177                 const struct nfs_lock_context *l_ctx,
4178                 fmode_t fmode)
4179 {
4180         nfs4_stateid current_stateid;
4181
4182         /* If the current stateid represents a lost lock, then exit */
4183         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4184                 return true;
4185         return nfs4_stateid_match(stateid, &current_stateid);
4186 }
4187
4188 static bool nfs4_error_stateid_expired(int err)
4189 {
4190         switch (err) {
4191         case -NFS4ERR_DELEG_REVOKED:
4192         case -NFS4ERR_ADMIN_REVOKED:
4193         case -NFS4ERR_BAD_STATEID:
4194         case -NFS4ERR_STALE_STATEID:
4195         case -NFS4ERR_OLD_STATEID:
4196         case -NFS4ERR_OPENMODE:
4197         case -NFS4ERR_EXPIRED:
4198                 return true;
4199         }
4200         return false;
4201 }
4202
4203 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4204 {
4205         nfs_invalidate_atime(hdr->inode);
4206 }
4207
4208 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4209 {
4210         struct nfs_server *server = NFS_SERVER(hdr->inode);
4211
4212         trace_nfs4_read(hdr, task->tk_status);
4213         if (nfs4_async_handle_error(task, server,
4214                                     hdr->args.context->state,
4215                                     NULL) == -EAGAIN) {
4216                 rpc_restart_call_prepare(task);
4217                 return -EAGAIN;
4218         }
4219
4220         __nfs4_read_done_cb(hdr);
4221         if (task->tk_status > 0)
4222                 renew_lease(server, hdr->timestamp);
4223         return 0;
4224 }
4225
4226 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4227                 struct nfs_pgio_args *args)
4228 {
4229
4230         if (!nfs4_error_stateid_expired(task->tk_status) ||
4231                 nfs4_stateid_is_current(&args->stateid,
4232                                 args->context,
4233                                 args->lock_context,
4234                                 FMODE_READ))
4235                 return false;
4236         rpc_restart_call_prepare(task);
4237         return true;
4238 }
4239
4240 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4241 {
4242
4243         dprintk("--> %s\n", __func__);
4244
4245         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4246                 return -EAGAIN;
4247         if (nfs4_read_stateid_changed(task, &hdr->args))
4248                 return -EAGAIN;
4249         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4250                                     nfs4_read_done_cb(task, hdr);
4251 }
4252
4253 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4254                                  struct rpc_message *msg)
4255 {
4256         hdr->timestamp   = jiffies;
4257         hdr->pgio_done_cb = nfs4_read_done_cb;
4258         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4259         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4260 }
4261
4262 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4263                                       struct nfs_pgio_header *hdr)
4264 {
4265         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4266                         &hdr->args.seq_args,
4267                         &hdr->res.seq_res,
4268                         task))
4269                 return 0;
4270         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4271                                 hdr->args.lock_context,
4272                                 hdr->rw_ops->rw_mode) == -EIO)
4273                 return -EIO;
4274         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4275                 return -EIO;
4276         return 0;
4277 }
4278
4279 static int nfs4_write_done_cb(struct rpc_task *task,
4280                               struct nfs_pgio_header *hdr)
4281 {
4282         struct inode *inode = hdr->inode;
4283
4284         trace_nfs4_write(hdr, task->tk_status);
4285         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4286                                     hdr->args.context->state,
4287                                     NULL) == -EAGAIN) {
4288                 rpc_restart_call_prepare(task);
4289                 return -EAGAIN;
4290         }
4291         if (task->tk_status >= 0) {
4292                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4293                 nfs_writeback_update_inode(hdr);
4294         }
4295         return 0;
4296 }
4297
4298 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4299                 struct nfs_pgio_args *args)
4300 {
4301
4302         if (!nfs4_error_stateid_expired(task->tk_status) ||
4303                 nfs4_stateid_is_current(&args->stateid,
4304                                 args->context,
4305                                 args->lock_context,
4306                                 FMODE_WRITE))
4307                 return false;
4308         rpc_restart_call_prepare(task);
4309         return true;
4310 }
4311
4312 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4313 {
4314         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4315                 return -EAGAIN;
4316         if (nfs4_write_stateid_changed(task, &hdr->args))
4317                 return -EAGAIN;
4318         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4319                 nfs4_write_done_cb(task, hdr);
4320 }
4321
4322 static
4323 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4324 {
4325         /* Don't request attributes for pNFS or O_DIRECT writes */
4326         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4327                 return false;
4328         /* Otherwise, request attributes if and only if we don't hold
4329          * a delegation
4330          */
4331         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4332 }
4333
4334 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4335                                   struct rpc_message *msg)
4336 {
4337         struct nfs_server *server = NFS_SERVER(hdr->inode);
4338
4339         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4340                 hdr->args.bitmask = NULL;
4341                 hdr->res.fattr = NULL;
4342         } else
4343                 hdr->args.bitmask = server->cache_consistency_bitmask;
4344
4345         if (!hdr->pgio_done_cb)
4346                 hdr->pgio_done_cb = nfs4_write_done_cb;
4347         hdr->res.server = server;
4348         hdr->timestamp   = jiffies;
4349
4350         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4351         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4352 }
4353
4354 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4355 {
4356         nfs4_setup_sequence(NFS_SERVER(data->inode),
4357                         &data->args.seq_args,
4358                         &data->res.seq_res,
4359                         task);
4360 }
4361
4362 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4363 {
4364         struct inode *inode = data->inode;
4365
4366         trace_nfs4_commit(data, task->tk_status);
4367         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4368                                     NULL, NULL) == -EAGAIN) {
4369                 rpc_restart_call_prepare(task);
4370                 return -EAGAIN;
4371         }
4372         return 0;
4373 }
4374
4375 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4376 {
4377         if (!nfs4_sequence_done(task, &data->res.seq_res))
4378                 return -EAGAIN;
4379         return data->commit_done_cb(task, data);
4380 }
4381
4382 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4383 {
4384         struct nfs_server *server = NFS_SERVER(data->inode);
4385
4386         if (data->commit_done_cb == NULL)
4387                 data->commit_done_cb = nfs4_commit_done_cb;
4388         data->res.server = server;
4389         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4390         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4391 }
4392
4393 struct nfs4_renewdata {
4394         struct nfs_client       *client;
4395         unsigned long           timestamp;
4396 };
4397
4398 /*
4399  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4400  * standalone procedure for queueing an asynchronous RENEW.
4401  */
4402 static void nfs4_renew_release(void *calldata)
4403 {
4404         struct nfs4_renewdata *data = calldata;
4405         struct nfs_client *clp = data->client;
4406
4407         if (atomic_read(&clp->cl_count) > 1)
4408                 nfs4_schedule_state_renewal(clp);
4409         nfs_put_client(clp);
4410         kfree(data);
4411 }
4412
4413 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4414 {
4415         struct nfs4_renewdata *data = calldata;
4416         struct nfs_client *clp = data->client;
4417         unsigned long timestamp = data->timestamp;
4418
4419         trace_nfs4_renew_async(clp, task->tk_status);
4420         switch (task->tk_status) {
4421         case 0:
4422                 break;
4423         case -NFS4ERR_LEASE_MOVED:
4424                 nfs4_schedule_lease_moved_recovery(clp);
4425                 break;
4426         default:
4427                 /* Unless we're shutting down, schedule state recovery! */
4428                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4429                         return;
4430                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4431                         nfs4_schedule_lease_recovery(clp);
4432                         return;
4433                 }
4434                 nfs4_schedule_path_down_recovery(clp);
4435         }
4436         do_renew_lease(clp, timestamp);
4437 }
4438
4439 static const struct rpc_call_ops nfs4_renew_ops = {
4440         .rpc_call_done = nfs4_renew_done,
4441         .rpc_release = nfs4_renew_release,
4442 };
4443
4444 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4445 {
4446         struct rpc_message msg = {
4447                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4448                 .rpc_argp       = clp,
4449                 .rpc_cred       = cred,
4450         };
4451         struct nfs4_renewdata *data;
4452
4453         if (renew_flags == 0)
4454                 return 0;
4455         if (!atomic_inc_not_zero(&clp->cl_count))
4456                 return -EIO;
4457         data = kmalloc(sizeof(*data), GFP_NOFS);
4458         if (data == NULL)
4459                 return -ENOMEM;
4460         data->client = clp;
4461         data->timestamp = jiffies;
4462         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4463                         &nfs4_renew_ops, data);
4464 }
4465
4466 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4467 {
4468         struct rpc_message msg = {
4469                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4470                 .rpc_argp       = clp,
4471                 .rpc_cred       = cred,
4472         };
4473         unsigned long now = jiffies;
4474         int status;
4475
4476         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4477         if (status < 0)
4478                 return status;
4479         do_renew_lease(clp, now);
4480         return 0;
4481 }
4482
4483 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4484 {
4485         return server->caps & NFS_CAP_ACLS;
4486 }
4487
4488 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4489  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4490  * the stack.
4491  */
4492 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4493
4494 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4495                 struct page **pages, unsigned int *pgbase)
4496 {
4497         struct page *newpage, **spages;
4498         int rc = 0;
4499         size_t len;
4500         spages = pages;
4501
4502         do {
4503                 len = min_t(size_t, PAGE_SIZE, buflen);
4504                 newpage = alloc_page(GFP_KERNEL);
4505
4506                 if (newpage == NULL)
4507                         goto unwind;
4508                 memcpy(page_address(newpage), buf, len);
4509                 buf += len;
4510                 buflen -= len;
4511                 *pages++ = newpage;
4512                 rc++;
4513         } while (buflen != 0);
4514
4515         return rc;
4516
4517 unwind:
4518         for(; rc > 0; rc--)
4519                 __free_page(spages[rc-1]);
4520         return -ENOMEM;
4521 }
4522
4523 struct nfs4_cached_acl {
4524         int cached;
4525         size_t len;
4526         char data[0];
4527 };
4528
4529 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4530 {
4531         struct nfs_inode *nfsi = NFS_I(inode);
4532
4533         spin_lock(&inode->i_lock);
4534         kfree(nfsi->nfs4_acl);
4535         nfsi->nfs4_acl = acl;
4536         spin_unlock(&inode->i_lock);
4537 }
4538
4539 static void nfs4_zap_acl_attr(struct inode *inode)
4540 {
4541         nfs4_set_cached_acl(inode, NULL);
4542 }
4543
4544 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4545 {
4546         struct nfs_inode *nfsi = NFS_I(inode);
4547         struct nfs4_cached_acl *acl;
4548         int ret = -ENOENT;
4549
4550         spin_lock(&inode->i_lock);
4551         acl = nfsi->nfs4_acl;
4552         if (acl == NULL)
4553                 goto out;
4554         if (buf == NULL) /* user is just asking for length */
4555                 goto out_len;
4556         if (acl->cached == 0)
4557                 goto out;
4558         ret = -ERANGE; /* see getxattr(2) man page */
4559         if (acl->len > buflen)
4560                 goto out;
4561         memcpy(buf, acl->data, acl->len);
4562 out_len:
4563         ret = acl->len;
4564 out:
4565         spin_unlock(&inode->i_lock);
4566         return ret;
4567 }
4568
4569 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4570 {
4571         struct nfs4_cached_acl *acl;
4572         size_t buflen = sizeof(*acl) + acl_len;
4573
4574         if (buflen <= PAGE_SIZE) {
4575                 acl = kmalloc(buflen, GFP_KERNEL);
4576                 if (acl == NULL)
4577                         goto out;
4578                 acl->cached = 1;
4579                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4580         } else {
4581                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4582                 if (acl == NULL)
4583                         goto out;
4584                 acl->cached = 0;
4585         }
4586         acl->len = acl_len;
4587 out:
4588         nfs4_set_cached_acl(inode, acl);
4589 }
4590
4591 /*
4592  * The getxattr API returns the required buffer length when called with a
4593  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4594  * the required buf.  On a NULL buf, we send a page of data to the server
4595  * guessing that the ACL request can be serviced by a page. If so, we cache
4596  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4597  * the cache. If not so, we throw away the page, and cache the required
4598  * length. The next getxattr call will then produce another round trip to
4599  * the server, this time with the input buf of the required size.
4600  */
4601 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4602 {
4603         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4604         struct nfs_getaclargs args = {
4605                 .fh = NFS_FH(inode),
4606                 .acl_pages = pages,
4607                 .acl_len = buflen,
4608         };
4609         struct nfs_getaclres res = {
4610                 .acl_len = buflen,
4611         };
4612         struct rpc_message msg = {
4613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4614                 .rpc_argp = &args,
4615                 .rpc_resp = &res,
4616         };
4617         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4618         int ret = -ENOMEM, i;
4619
4620         /* As long as we're doing a round trip to the server anyway,
4621          * let's be prepared for a page of acl data. */
4622         if (npages == 0)
4623                 npages = 1;
4624         if (npages > ARRAY_SIZE(pages))
4625                 return -ERANGE;
4626
4627         for (i = 0; i < npages; i++) {
4628                 pages[i] = alloc_page(GFP_KERNEL);
4629                 if (!pages[i])
4630                         goto out_free;
4631         }
4632
4633         /* for decoding across pages */
4634         res.acl_scratch = alloc_page(GFP_KERNEL);
4635         if (!res.acl_scratch)
4636                 goto out_free;
4637
4638         args.acl_len = npages * PAGE_SIZE;
4639         args.acl_pgbase = 0;
4640
4641         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4642                 __func__, buf, buflen, npages, args.acl_len);
4643         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4644                              &msg, &args.seq_args, &res.seq_res, 0);
4645         if (ret)
4646                 goto out_free;
4647
4648         /* Handle the case where the passed-in buffer is too short */
4649         if (res.acl_flags & NFS4_ACL_TRUNC) {
4650                 /* Did the user only issue a request for the acl length? */
4651                 if (buf == NULL)
4652                         goto out_ok;
4653                 ret = -ERANGE;
4654                 goto out_free;
4655         }
4656         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4657         if (buf) {
4658                 if (res.acl_len > buflen) {
4659                         ret = -ERANGE;
4660                         goto out_free;
4661                 }
4662                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4663         }
4664 out_ok:
4665         ret = res.acl_len;
4666 out_free:
4667         for (i = 0; i < npages; i++)
4668                 if (pages[i])
4669                         __free_page(pages[i]);
4670         if (res.acl_scratch)
4671                 __free_page(res.acl_scratch);
4672         return ret;
4673 }
4674
4675 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4676 {
4677         struct nfs4_exception exception = { };
4678         ssize_t ret;
4679         do {
4680                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4681                 trace_nfs4_get_acl(inode, ret);
4682                 if (ret >= 0)
4683                         break;
4684                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4685         } while (exception.retry);
4686         return ret;
4687 }
4688
4689 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4690 {
4691         struct nfs_server *server = NFS_SERVER(inode);
4692         int ret;
4693
4694         if (!nfs4_server_supports_acls(server))
4695                 return -EOPNOTSUPP;
4696         ret = nfs_revalidate_inode(server, inode);
4697         if (ret < 0)
4698                 return ret;
4699         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4700                 nfs_zap_acl_cache(inode);
4701         ret = nfs4_read_cached_acl(inode, buf, buflen);
4702         if (ret != -ENOENT)
4703                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4704                  * but no cached acl data, just the acl length */
4705                 return ret;
4706         return nfs4_get_acl_uncached(inode, buf, buflen);
4707 }
4708
4709 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4710 {
4711         struct nfs_server *server = NFS_SERVER(inode);
4712         struct page *pages[NFS4ACL_MAXPAGES];
4713         struct nfs_setaclargs arg = {
4714                 .fh             = NFS_FH(inode),
4715                 .acl_pages      = pages,
4716                 .acl_len        = buflen,
4717         };
4718         struct nfs_setaclres res;
4719         struct rpc_message msg = {
4720                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4721                 .rpc_argp       = &arg,
4722                 .rpc_resp       = &res,
4723         };
4724         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4725         int ret, i;
4726
4727         if (!nfs4_server_supports_acls(server))
4728                 return -EOPNOTSUPP;
4729         if (npages > ARRAY_SIZE(pages))
4730                 return -ERANGE;
4731         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4732         if (i < 0)
4733                 return i;
4734         nfs4_inode_return_delegation(inode);
4735         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4736
4737         /*
4738          * Free each page after tx, so the only ref left is
4739          * held by the network stack
4740          */
4741         for (; i > 0; i--)
4742                 put_page(pages[i-1]);
4743
4744         /*
4745          * Acl update can result in inode attribute update.
4746          * so mark the attribute cache invalid.
4747          */
4748         spin_lock(&inode->i_lock);
4749         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4750         spin_unlock(&inode->i_lock);
4751         nfs_access_zap_cache(inode);
4752         nfs_zap_acl_cache(inode);
4753         return ret;
4754 }
4755
4756 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4757 {
4758         struct nfs4_exception exception = { };
4759         int err;
4760         do {
4761                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4762                 trace_nfs4_set_acl(inode, err);
4763                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4764                                 &exception);
4765         } while (exception.retry);
4766         return err;
4767 }
4768
4769 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4770 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4771                                         size_t buflen)
4772 {
4773         struct nfs_server *server = NFS_SERVER(inode);
4774         struct nfs_fattr fattr;
4775         struct nfs4_label label = {0, 0, buflen, buf};
4776
4777         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4778         struct nfs4_getattr_arg arg = {
4779                 .fh             = NFS_FH(inode),
4780                 .bitmask        = bitmask,
4781         };
4782         struct nfs4_getattr_res res = {
4783                 .fattr          = &fattr,
4784                 .label          = &label,
4785                 .server         = server,
4786         };
4787         struct rpc_message msg = {
4788                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4789                 .rpc_argp       = &arg,
4790                 .rpc_resp       = &res,
4791         };
4792         int ret;
4793
4794         nfs_fattr_init(&fattr);
4795
4796         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4797         if (ret)
4798                 return ret;
4799         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4800                 return -ENOENT;
4801         if (buflen < label.len)
4802                 return -ERANGE;
4803         return 0;
4804 }
4805
4806 static int nfs4_get_security_label(struct inode *inode, void *buf,
4807                                         size_t buflen)
4808 {
4809         struct nfs4_exception exception = { };
4810         int err;
4811
4812         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4813                 return -EOPNOTSUPP;
4814
4815         do {
4816                 err = _nfs4_get_security_label(inode, buf, buflen);
4817                 trace_nfs4_get_security_label(inode, err);
4818                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4819                                 &exception);
4820         } while (exception.retry);
4821         return err;
4822 }
4823
4824 static int _nfs4_do_set_security_label(struct inode *inode,
4825                 struct nfs4_label *ilabel,
4826                 struct nfs_fattr *fattr,
4827                 struct nfs4_label *olabel)
4828 {
4829
4830         struct iattr sattr = {0};
4831         struct nfs_server *server = NFS_SERVER(inode);
4832         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4833         struct nfs_setattrargs arg = {
4834                 .fh             = NFS_FH(inode),
4835                 .iap            = &sattr,
4836                 .server         = server,
4837                 .bitmask        = bitmask,
4838                 .label          = ilabel,
4839         };
4840         struct nfs_setattrres res = {
4841                 .fattr          = fattr,
4842                 .label          = olabel,
4843                 .server         = server,
4844         };
4845         struct rpc_message msg = {
4846                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4847                 .rpc_argp       = &arg,
4848                 .rpc_resp       = &res,
4849         };
4850         int status;
4851
4852         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4853
4854         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4855         if (status)
4856                 dprintk("%s failed: %d\n", __func__, status);
4857
4858         return status;
4859 }
4860
4861 static int nfs4_do_set_security_label(struct inode *inode,
4862                 struct nfs4_label *ilabel,
4863                 struct nfs_fattr *fattr,
4864                 struct nfs4_label *olabel)
4865 {
4866         struct nfs4_exception exception = { };
4867         int err;
4868
4869         do {
4870                 err = _nfs4_do_set_security_label(inode, ilabel,
4871                                 fattr, olabel);
4872                 trace_nfs4_set_security_label(inode, err);
4873                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4874                                 &exception);
4875         } while (exception.retry);
4876         return err;
4877 }
4878
4879 static int
4880 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4881 {
4882         struct nfs4_label ilabel, *olabel = NULL;
4883         struct nfs_fattr fattr;
4884         struct rpc_cred *cred;
4885         struct inode *inode = d_inode(dentry);
4886         int status;
4887
4888         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4889                 return -EOPNOTSUPP;
4890
4891         nfs_fattr_init(&fattr);
4892
4893         ilabel.pi = 0;
4894         ilabel.lfs = 0;
4895         ilabel.label = (char *)buf;
4896         ilabel.len = buflen;
4897
4898         cred = rpc_lookup_cred();
4899         if (IS_ERR(cred))
4900                 return PTR_ERR(cred);
4901
4902         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4903         if (IS_ERR(olabel)) {
4904                 status = -PTR_ERR(olabel);
4905                 goto out;
4906         }
4907
4908         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4909         if (status == 0)
4910                 nfs_setsecurity(inode, &fattr, olabel);
4911
4912         nfs4_label_free(olabel);
4913 out:
4914         put_rpccred(cred);
4915         return status;
4916 }
4917 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4918
4919
4920 static int
4921 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4922                         struct nfs4_state *state, long *timeout)
4923 {
4924         struct nfs_client *clp = server->nfs_client;
4925
4926         if (task->tk_status >= 0)
4927                 return 0;
4928         switch(task->tk_status) {
4929                 case -NFS4ERR_DELEG_REVOKED:
4930                 case -NFS4ERR_ADMIN_REVOKED:
4931                 case -NFS4ERR_BAD_STATEID:
4932                 case -NFS4ERR_OPENMODE:
4933                         if (state == NULL)
4934                                 break;
4935                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4936                                 goto recovery_failed;
4937                         goto wait_on_recovery;
4938                 case -NFS4ERR_EXPIRED:
4939                         if (state != NULL) {
4940                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4941                                         goto recovery_failed;
4942                         }
4943                 case -NFS4ERR_STALE_STATEID:
4944                 case -NFS4ERR_STALE_CLIENTID:
4945                         nfs4_schedule_lease_recovery(clp);
4946                         goto wait_on_recovery;
4947                 case -NFS4ERR_MOVED:
4948                         if (nfs4_schedule_migration_recovery(server) < 0)
4949                                 goto recovery_failed;
4950                         goto wait_on_recovery;
4951                 case -NFS4ERR_LEASE_MOVED:
4952                         nfs4_schedule_lease_moved_recovery(clp);
4953                         goto wait_on_recovery;
4954 #if defined(CONFIG_NFS_V4_1)
4955                 case -NFS4ERR_BADSESSION:
4956                 case -NFS4ERR_BADSLOT:
4957                 case -NFS4ERR_BAD_HIGH_SLOT:
4958                 case -NFS4ERR_DEADSESSION:
4959                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4960                 case -NFS4ERR_SEQ_FALSE_RETRY:
4961                 case -NFS4ERR_SEQ_MISORDERED:
4962                         dprintk("%s ERROR %d, Reset session\n", __func__,
4963                                 task->tk_status);
4964                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4965                         goto wait_on_recovery;
4966 #endif /* CONFIG_NFS_V4_1 */
4967                 case -NFS4ERR_DELAY:
4968                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4969                         rpc_delay(task, nfs4_update_delay(timeout));
4970                         goto restart_call;
4971                 case -NFS4ERR_GRACE:
4972                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4973                 case -NFS4ERR_RETRY_UNCACHED_REP:
4974                 case -NFS4ERR_OLD_STATEID:
4975                         goto restart_call;
4976         }
4977         task->tk_status = nfs4_map_errors(task->tk_status);
4978         return 0;
4979 recovery_failed:
4980         task->tk_status = -EIO;
4981         return 0;
4982 wait_on_recovery:
4983         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4984         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4985                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4986         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4987                 goto recovery_failed;
4988 restart_call:
4989         task->tk_status = 0;
4990         return -EAGAIN;
4991 }
4992
4993 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4994                                     nfs4_verifier *bootverf)
4995 {
4996         __be32 verf[2];
4997
4998         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4999                 /* An impossible timestamp guarantees this value
5000                  * will never match a generated boot time. */
5001                 verf[0] = 0;
5002                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5003         } else {
5004                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5005                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5006                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5007         }
5008         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5009 }
5010
5011 static int
5012 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5013 {
5014         int result;
5015         size_t len;
5016         char *str;
5017         bool retried = false;
5018
5019         if (clp->cl_owner_id != NULL)
5020                 return 0;
5021 retry:
5022         rcu_read_lock();
5023         len = 10 + strlen(clp->cl_ipaddr) + 1 +
5024                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5025                 1 +
5026                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5027                 1;
5028         rcu_read_unlock();
5029
5030         if (len > NFS4_OPAQUE_LIMIT + 1)
5031                 return -EINVAL;
5032
5033         /*
5034          * Since this string is allocated at mount time, and held until the
5035          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5036          * about a memory-reclaim deadlock.
5037          */
5038         str = kmalloc(len, GFP_KERNEL);
5039         if (!str)
5040                 return -ENOMEM;
5041
5042         rcu_read_lock();
5043         result = scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5044                         clp->cl_ipaddr,
5045                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5046                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5047         rcu_read_unlock();
5048
5049         /* Did something change? */
5050         if (result >= len) {
5051                 kfree(str);
5052                 if (retried)
5053                         return -EINVAL;
5054                 retried = true;
5055                 goto retry;
5056         }
5057         clp->cl_owner_id = str;
5058         return 0;
5059 }
5060
5061 static int
5062 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5063 {
5064         int result;
5065         size_t len;
5066         char *str;
5067
5068         len = 10 + 10 + 1 + 10 + 1 +
5069                 strlen(nfs4_client_id_uniquifier) + 1 +
5070                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5071
5072         if (len > NFS4_OPAQUE_LIMIT + 1)
5073                 return -EINVAL;
5074
5075         /*
5076          * Since this string is allocated at mount time, and held until the
5077          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5078          * about a memory-reclaim deadlock.
5079          */
5080         str = kmalloc(len, GFP_KERNEL);
5081         if (!str)
5082                 return -ENOMEM;
5083
5084         result = scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5085                         clp->rpc_ops->version, clp->cl_minorversion,
5086                         nfs4_client_id_uniquifier,
5087                         clp->cl_rpcclient->cl_nodename);
5088         if (result >= len) {
5089                 kfree(str);
5090                 return -EINVAL;
5091         }
5092         clp->cl_owner_id = str;
5093         return 0;
5094 }
5095
5096 static int
5097 nfs4_init_uniform_client_string(struct nfs_client *clp)
5098 {
5099         int result;
5100         size_t len;
5101         char *str;
5102
5103         if (clp->cl_owner_id != NULL)
5104                 return 0;
5105
5106         if (nfs4_client_id_uniquifier[0] != '\0')
5107                 return nfs4_init_uniquifier_client_string(clp);
5108
5109         len = 10 + 10 + 1 + 10 + 1 +
5110                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5111
5112         if (len > NFS4_OPAQUE_LIMIT + 1)
5113                 return -EINVAL;
5114
5115         /*
5116          * Since this string is allocated at mount time, and held until the
5117          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5118          * about a memory-reclaim deadlock.
5119          */
5120         str = kmalloc(len, GFP_KERNEL);
5121         if (!str)
5122                 return -ENOMEM;
5123
5124         result = scnprintf(str, len, "Linux NFSv%u.%u %s",
5125                         clp->rpc_ops->version, clp->cl_minorversion,
5126                         clp->cl_rpcclient->cl_nodename);
5127         if (result >= len) {
5128                 kfree(str);
5129                 return -EINVAL;
5130         }
5131         clp->cl_owner_id = str;
5132         return 0;
5133 }
5134
5135 /*
5136  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5137  * services.  Advertise one based on the address family of the
5138  * clientaddr.
5139  */
5140 static unsigned int
5141 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5142 {
5143         if (strchr(clp->cl_ipaddr, ':') != NULL)
5144                 return scnprintf(buf, len, "tcp6");
5145         else
5146                 return scnprintf(buf, len, "tcp");
5147 }
5148
5149 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5150 {
5151         struct nfs4_setclientid *sc = calldata;
5152
5153         if (task->tk_status == 0)
5154                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5155 }
5156
5157 static const struct rpc_call_ops nfs4_setclientid_ops = {
5158         .rpc_call_done = nfs4_setclientid_done,
5159 };
5160
5161 /**
5162  * nfs4_proc_setclientid - Negotiate client ID
5163  * @clp: state data structure
5164  * @program: RPC program for NFSv4 callback service
5165  * @port: IP port number for NFS4 callback service
5166  * @cred: RPC credential to use for this call
5167  * @res: where to place the result
5168  *
5169  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5170  */
5171 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5172                 unsigned short port, struct rpc_cred *cred,
5173                 struct nfs4_setclientid_res *res)
5174 {
5175         nfs4_verifier sc_verifier;
5176         struct nfs4_setclientid setclientid = {
5177                 .sc_verifier = &sc_verifier,
5178                 .sc_prog = program,
5179                 .sc_clnt = clp,
5180         };
5181         struct rpc_message msg = {
5182                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5183                 .rpc_argp = &setclientid,
5184                 .rpc_resp = res,
5185                 .rpc_cred = cred,
5186         };
5187         struct rpc_task *task;
5188         struct rpc_task_setup task_setup_data = {
5189                 .rpc_client = clp->cl_rpcclient,
5190                 .rpc_message = &msg,
5191                 .callback_ops = &nfs4_setclientid_ops,
5192                 .callback_data = &setclientid,
5193                 .flags = RPC_TASK_TIMEOUT,
5194         };
5195         int status;
5196
5197         /* nfs_client_id4 */
5198         nfs4_init_boot_verifier(clp, &sc_verifier);
5199
5200         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5201                 status = nfs4_init_uniform_client_string(clp);
5202         else
5203                 status = nfs4_init_nonuniform_client_string(clp);
5204
5205         if (status)
5206                 goto out;
5207
5208         /* cb_client4 */
5209         setclientid.sc_netid_len =
5210                                 nfs4_init_callback_netid(clp,
5211                                                 setclientid.sc_netid,
5212                                                 sizeof(setclientid.sc_netid));
5213         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5214                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5215                                 clp->cl_ipaddr, port >> 8, port & 255);
5216
5217         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5218                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5219                 clp->cl_owner_id);
5220         task = rpc_run_task(&task_setup_data);
5221         if (IS_ERR(task)) {
5222                 status = PTR_ERR(task);
5223                 goto out;
5224         }
5225         status = task->tk_status;
5226         if (setclientid.sc_cred) {
5227                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5228                 put_rpccred(setclientid.sc_cred);
5229         }
5230         rpc_put_task(task);
5231 out:
5232         trace_nfs4_setclientid(clp, status);
5233         dprintk("NFS reply setclientid: %d\n", status);
5234         return status;
5235 }
5236
5237 /**
5238  * nfs4_proc_setclientid_confirm - Confirm client ID
5239  * @clp: state data structure
5240  * @res: result of a previous SETCLIENTID
5241  * @cred: RPC credential to use for this call
5242  *
5243  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5244  */
5245 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5246                 struct nfs4_setclientid_res *arg,
5247                 struct rpc_cred *cred)
5248 {
5249         struct rpc_message msg = {
5250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5251                 .rpc_argp = arg,
5252                 .rpc_cred = cred,
5253         };
5254         int status;
5255
5256         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5257                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5258                 clp->cl_clientid);
5259         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5260         trace_nfs4_setclientid_confirm(clp, status);
5261         dprintk("NFS reply setclientid_confirm: %d\n", status);
5262         return status;
5263 }
5264
5265 struct nfs4_delegreturndata {
5266         struct nfs4_delegreturnargs args;
5267         struct nfs4_delegreturnres res;
5268         struct nfs_fh fh;
5269         nfs4_stateid stateid;
5270         unsigned long timestamp;
5271         struct nfs_fattr fattr;
5272         int rpc_status;
5273         struct inode *inode;
5274         bool roc;
5275         u32 roc_barrier;
5276 };
5277
5278 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5279 {
5280         struct nfs4_delegreturndata *data = calldata;
5281
5282         if (!nfs4_sequence_done(task, &data->res.seq_res))
5283                 return;
5284
5285         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5286         switch (task->tk_status) {
5287         case 0:
5288                 renew_lease(data->res.server, data->timestamp);
5289         case -NFS4ERR_ADMIN_REVOKED:
5290         case -NFS4ERR_DELEG_REVOKED:
5291         case -NFS4ERR_BAD_STATEID:
5292         case -NFS4ERR_OLD_STATEID:
5293         case -NFS4ERR_STALE_STATEID:
5294         case -NFS4ERR_EXPIRED:
5295                 task->tk_status = 0;
5296                 if (data->roc)
5297                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5298                 break;
5299         default:
5300                 if (nfs4_async_handle_error(task, data->res.server,
5301                                             NULL, NULL) == -EAGAIN) {
5302                         rpc_restart_call_prepare(task);
5303                         return;
5304                 }
5305         }
5306         data->rpc_status = task->tk_status;
5307 }
5308
5309 static void nfs4_delegreturn_release(void *calldata)
5310 {
5311         struct nfs4_delegreturndata *data = calldata;
5312         struct inode *inode = data->inode;
5313
5314         if (inode) {
5315                 if (data->roc)
5316                         pnfs_roc_release(inode);
5317                 nfs_iput_and_deactive(inode);
5318         }
5319         kfree(calldata);
5320 }
5321
5322 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5323 {
5324         struct nfs4_delegreturndata *d_data;
5325
5326         d_data = (struct nfs4_delegreturndata *)data;
5327
5328         if (d_data->roc)
5329                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5330
5331         nfs4_setup_sequence(d_data->res.server,
5332                         &d_data->args.seq_args,
5333                         &d_data->res.seq_res,
5334                         task);
5335 }
5336
5337 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5338         .rpc_call_prepare = nfs4_delegreturn_prepare,
5339         .rpc_call_done = nfs4_delegreturn_done,
5340         .rpc_release = nfs4_delegreturn_release,
5341 };
5342
5343 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5344 {
5345         struct nfs4_delegreturndata *data;
5346         struct nfs_server *server = NFS_SERVER(inode);
5347         struct rpc_task *task;
5348         struct rpc_message msg = {
5349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5350                 .rpc_cred = cred,
5351         };
5352         struct rpc_task_setup task_setup_data = {
5353                 .rpc_client = server->client,
5354                 .rpc_message = &msg,
5355                 .callback_ops = &nfs4_delegreturn_ops,
5356                 .flags = RPC_TASK_ASYNC,
5357         };
5358         int status = 0;
5359
5360         data = kzalloc(sizeof(*data), GFP_NOFS);
5361         if (data == NULL)
5362                 return -ENOMEM;
5363         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5364         data->args.fhandle = &data->fh;
5365         data->args.stateid = &data->stateid;
5366         data->args.bitmask = server->cache_consistency_bitmask;
5367         nfs_copy_fh(&data->fh, NFS_FH(inode));
5368         nfs4_stateid_copy(&data->stateid, stateid);
5369         data->res.fattr = &data->fattr;
5370         data->res.server = server;
5371         nfs_fattr_init(data->res.fattr);
5372         data->timestamp = jiffies;
5373         data->rpc_status = 0;
5374         data->inode = nfs_igrab_and_active(inode);
5375         if (data->inode)
5376                 data->roc = nfs4_roc(inode);
5377
5378         task_setup_data.callback_data = data;
5379         msg.rpc_argp = &data->args;
5380         msg.rpc_resp = &data->res;
5381         task = rpc_run_task(&task_setup_data);
5382         if (IS_ERR(task))
5383                 return PTR_ERR(task);
5384         if (!issync)
5385                 goto out;
5386         status = nfs4_wait_for_completion_rpc_task(task);
5387         if (status != 0)
5388                 goto out;
5389         status = data->rpc_status;
5390         if (status == 0)
5391                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5392         else
5393                 nfs_refresh_inode(inode, &data->fattr);
5394 out:
5395         rpc_put_task(task);
5396         return status;
5397 }
5398
5399 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5400 {
5401         struct nfs_server *server = NFS_SERVER(inode);
5402         struct nfs4_exception exception = { };
5403         int err;
5404         do {
5405                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5406                 trace_nfs4_delegreturn(inode, err);
5407                 switch (err) {
5408                         case -NFS4ERR_STALE_STATEID:
5409                         case -NFS4ERR_EXPIRED:
5410                         case 0:
5411                                 return 0;
5412                 }
5413                 err = nfs4_handle_exception(server, err, &exception);
5414         } while (exception.retry);
5415         return err;
5416 }
5417
5418 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5419 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5420
5421 /*
5422  * sleep, with exponential backoff, and retry the LOCK operation.
5423  */
5424 static unsigned long
5425 nfs4_set_lock_task_retry(unsigned long timeout)
5426 {
5427         freezable_schedule_timeout_killable_unsafe(timeout);
5428         timeout <<= 1;
5429         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5430                 return NFS4_LOCK_MAXTIMEOUT;
5431         return timeout;
5432 }
5433
5434 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5435 {
5436         struct inode *inode = state->inode;
5437         struct nfs_server *server = NFS_SERVER(inode);
5438         struct nfs_client *clp = server->nfs_client;
5439         struct nfs_lockt_args arg = {
5440                 .fh = NFS_FH(inode),
5441                 .fl = request,
5442         };
5443         struct nfs_lockt_res res = {
5444                 .denied = request,
5445         };
5446         struct rpc_message msg = {
5447                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5448                 .rpc_argp       = &arg,
5449                 .rpc_resp       = &res,
5450                 .rpc_cred       = state->owner->so_cred,
5451         };
5452         struct nfs4_lock_state *lsp;
5453         int status;
5454
5455         arg.lock_owner.clientid = clp->cl_clientid;
5456         status = nfs4_set_lock_state(state, request);
5457         if (status != 0)
5458                 goto out;
5459         lsp = request->fl_u.nfs4_fl.owner;
5460         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5461         arg.lock_owner.s_dev = server->s_dev;
5462         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5463         switch (status) {
5464                 case 0:
5465                         request->fl_type = F_UNLCK;
5466                         break;
5467                 case -NFS4ERR_DENIED:
5468                         status = 0;
5469         }
5470         request->fl_ops->fl_release_private(request);
5471         request->fl_ops = NULL;
5472 out:
5473         return status;
5474 }
5475
5476 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5477 {
5478         struct nfs4_exception exception = { };
5479         int err;
5480
5481         do {
5482                 err = _nfs4_proc_getlk(state, cmd, request);
5483                 trace_nfs4_get_lock(request, state, cmd, err);
5484                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5485                                 &exception);
5486         } while (exception.retry);
5487         return err;
5488 }
5489
5490 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5491 {
5492         int res = 0;
5493         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5494                 case FL_POSIX:
5495                         res = posix_lock_inode_wait(inode, fl);
5496                         break;
5497                 case FL_FLOCK:
5498                         res = flock_lock_inode_wait(inode, fl);
5499                         break;
5500                 default:
5501                         BUG();
5502         }
5503         return res;
5504 }
5505
5506 struct nfs4_unlockdata {
5507         struct nfs_locku_args arg;
5508         struct nfs_locku_res res;
5509         struct nfs4_lock_state *lsp;
5510         struct nfs_open_context *ctx;
5511         struct file_lock fl;
5512         const struct nfs_server *server;
5513         unsigned long timestamp;
5514 };
5515
5516 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5517                 struct nfs_open_context *ctx,
5518                 struct nfs4_lock_state *lsp,
5519                 struct nfs_seqid *seqid)
5520 {
5521         struct nfs4_unlockdata *p;
5522         struct inode *inode = lsp->ls_state->inode;
5523
5524         p = kzalloc(sizeof(*p), GFP_NOFS);
5525         if (p == NULL)
5526                 return NULL;
5527         p->arg.fh = NFS_FH(inode);
5528         p->arg.fl = &p->fl;
5529         p->arg.seqid = seqid;
5530         p->res.seqid = seqid;
5531         p->lsp = lsp;
5532         atomic_inc(&lsp->ls_count);
5533         /* Ensure we don't close file until we're done freeing locks! */
5534         p->ctx = get_nfs_open_context(ctx);
5535         memcpy(&p->fl, fl, sizeof(p->fl));
5536         p->server = NFS_SERVER(inode);
5537         return p;
5538 }
5539
5540 static void nfs4_locku_release_calldata(void *data)
5541 {
5542         struct nfs4_unlockdata *calldata = data;
5543         nfs_free_seqid(calldata->arg.seqid);
5544         nfs4_put_lock_state(calldata->lsp);
5545         put_nfs_open_context(calldata->ctx);
5546         kfree(calldata);
5547 }
5548
5549 static void nfs4_locku_done(struct rpc_task *task, void *data)
5550 {
5551         struct nfs4_unlockdata *calldata = data;
5552
5553         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5554                 return;
5555         switch (task->tk_status) {
5556                 case 0:
5557                         renew_lease(calldata->server, calldata->timestamp);
5558                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5559                         if (nfs4_update_lock_stateid(calldata->lsp,
5560                                         &calldata->res.stateid))
5561                                 break;
5562                 case -NFS4ERR_BAD_STATEID:
5563                 case -NFS4ERR_OLD_STATEID:
5564                 case -NFS4ERR_STALE_STATEID:
5565                 case -NFS4ERR_EXPIRED:
5566                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5567                                                 &calldata->lsp->ls_stateid))
5568                                 rpc_restart_call_prepare(task);
5569                         break;
5570                 default:
5571                         if (nfs4_async_handle_error(task, calldata->server,
5572                                                     NULL, NULL) == -EAGAIN)
5573                                 rpc_restart_call_prepare(task);
5574         }
5575         nfs_release_seqid(calldata->arg.seqid);
5576 }
5577
5578 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5579 {
5580         struct nfs4_unlockdata *calldata = data;
5581
5582         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5583                 goto out_wait;
5584         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5585         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5586                 /* Note: exit _without_ running nfs4_locku_done */
5587                 goto out_no_action;
5588         }
5589         calldata->timestamp = jiffies;
5590         if (nfs4_setup_sequence(calldata->server,
5591                                 &calldata->arg.seq_args,
5592                                 &calldata->res.seq_res,
5593                                 task) != 0)
5594                 nfs_release_seqid(calldata->arg.seqid);
5595         return;
5596 out_no_action:
5597         task->tk_action = NULL;
5598 out_wait:
5599         nfs4_sequence_done(task, &calldata->res.seq_res);
5600 }
5601
5602 static const struct rpc_call_ops nfs4_locku_ops = {
5603         .rpc_call_prepare = nfs4_locku_prepare,
5604         .rpc_call_done = nfs4_locku_done,
5605         .rpc_release = nfs4_locku_release_calldata,
5606 };
5607
5608 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5609                 struct nfs_open_context *ctx,
5610                 struct nfs4_lock_state *lsp,
5611                 struct nfs_seqid *seqid)
5612 {
5613         struct nfs4_unlockdata *data;
5614         struct rpc_message msg = {
5615                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5616                 .rpc_cred = ctx->cred,
5617         };
5618         struct rpc_task_setup task_setup_data = {
5619                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5620                 .rpc_message = &msg,
5621                 .callback_ops = &nfs4_locku_ops,
5622                 .workqueue = nfsiod_workqueue,
5623                 .flags = RPC_TASK_ASYNC,
5624         };
5625
5626         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5627                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5628
5629         /* Ensure this is an unlock - when canceling a lock, the
5630          * canceled lock is passed in, and it won't be an unlock.
5631          */
5632         fl->fl_type = F_UNLCK;
5633
5634         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5635         if (data == NULL) {
5636                 nfs_free_seqid(seqid);
5637                 return ERR_PTR(-ENOMEM);
5638         }
5639
5640         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5641         msg.rpc_argp = &data->arg;
5642         msg.rpc_resp = &data->res;
5643         task_setup_data.callback_data = data;
5644         return rpc_run_task(&task_setup_data);
5645 }
5646
5647 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5648 {
5649         struct inode *inode = state->inode;
5650         struct nfs4_state_owner *sp = state->owner;
5651         struct nfs_inode *nfsi = NFS_I(inode);
5652         struct nfs_seqid *seqid;
5653         struct nfs4_lock_state *lsp;
5654         struct rpc_task *task;
5655         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5656         int status = 0;
5657         unsigned char fl_flags = request->fl_flags;
5658
5659         status = nfs4_set_lock_state(state, request);
5660         /* Unlock _before_ we do the RPC call */
5661         request->fl_flags |= FL_EXISTS;
5662         /* Exclude nfs_delegation_claim_locks() */
5663         mutex_lock(&sp->so_delegreturn_mutex);
5664         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5665         down_read(&nfsi->rwsem);
5666         if (do_vfs_lock(inode, request) == -ENOENT) {
5667                 up_read(&nfsi->rwsem);
5668                 mutex_unlock(&sp->so_delegreturn_mutex);
5669                 goto out;
5670         }
5671         up_read(&nfsi->rwsem);
5672         mutex_unlock(&sp->so_delegreturn_mutex);
5673         if (status != 0)
5674                 goto out;
5675         /* Is this a delegated lock? */
5676         lsp = request->fl_u.nfs4_fl.owner;
5677         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5678                 goto out;
5679         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5680         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5681         status = -ENOMEM;
5682         if (IS_ERR(seqid))
5683                 goto out;
5684         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5685         status = PTR_ERR(task);
5686         if (IS_ERR(task))
5687                 goto out;
5688         status = nfs4_wait_for_completion_rpc_task(task);
5689         rpc_put_task(task);
5690 out:
5691         request->fl_flags = fl_flags;
5692         trace_nfs4_unlock(request, state, F_SETLK, status);
5693         return status;
5694 }
5695
5696 struct nfs4_lockdata {
5697         struct nfs_lock_args arg;
5698         struct nfs_lock_res res;
5699         struct nfs4_lock_state *lsp;
5700         struct nfs_open_context *ctx;
5701         struct file_lock fl;
5702         unsigned long timestamp;
5703         int rpc_status;
5704         int cancelled;
5705         struct nfs_server *server;
5706 };
5707
5708 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5709                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5710                 gfp_t gfp_mask)
5711 {
5712         struct nfs4_lockdata *p;
5713         struct inode *inode = lsp->ls_state->inode;
5714         struct nfs_server *server = NFS_SERVER(inode);
5715         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5716
5717         p = kzalloc(sizeof(*p), gfp_mask);
5718         if (p == NULL)
5719                 return NULL;
5720
5721         p->arg.fh = NFS_FH(inode);
5722         p->arg.fl = &p->fl;
5723         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5724         if (IS_ERR(p->arg.open_seqid))
5725                 goto out_free;
5726         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5727         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5728         if (IS_ERR(p->arg.lock_seqid))
5729                 goto out_free_seqid;
5730         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5731         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5732         p->arg.lock_owner.s_dev = server->s_dev;
5733         p->res.lock_seqid = p->arg.lock_seqid;
5734         p->lsp = lsp;
5735         p->server = server;
5736         atomic_inc(&lsp->ls_count);
5737         p->ctx = get_nfs_open_context(ctx);
5738         get_file(fl->fl_file);
5739         memcpy(&p->fl, fl, sizeof(p->fl));
5740         return p;
5741 out_free_seqid:
5742         nfs_free_seqid(p->arg.open_seqid);
5743 out_free:
5744         kfree(p);
5745         return NULL;
5746 }
5747
5748 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5749 {
5750         struct nfs4_lockdata *data = calldata;
5751         struct nfs4_state *state = data->lsp->ls_state;
5752
5753         dprintk("%s: begin!\n", __func__);
5754         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5755                 goto out_wait;
5756         /* Do we need to do an open_to_lock_owner? */
5757         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5758                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5759                         goto out_release_lock_seqid;
5760                 }
5761                 nfs4_stateid_copy(&data->arg.open_stateid,
5762                                 &state->open_stateid);
5763                 data->arg.new_lock_owner = 1;
5764                 data->res.open_seqid = data->arg.open_seqid;
5765         } else {
5766                 data->arg.new_lock_owner = 0;
5767                 nfs4_stateid_copy(&data->arg.lock_stateid,
5768                                 &data->lsp->ls_stateid);
5769         }
5770         if (!nfs4_valid_open_stateid(state)) {
5771                 data->rpc_status = -EBADF;
5772                 task->tk_action = NULL;
5773                 goto out_release_open_seqid;
5774         }
5775         data->timestamp = jiffies;
5776         if (nfs4_setup_sequence(data->server,
5777                                 &data->arg.seq_args,
5778                                 &data->res.seq_res,
5779                                 task) == 0)
5780                 return;
5781 out_release_open_seqid:
5782         nfs_release_seqid(data->arg.open_seqid);
5783 out_release_lock_seqid:
5784         nfs_release_seqid(data->arg.lock_seqid);
5785 out_wait:
5786         nfs4_sequence_done(task, &data->res.seq_res);
5787         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5788 }
5789
5790 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5791 {
5792         struct nfs4_lockdata *data = calldata;
5793         struct nfs4_lock_state *lsp = data->lsp;
5794
5795         dprintk("%s: begin!\n", __func__);
5796
5797         if (!nfs4_sequence_done(task, &data->res.seq_res))
5798                 return;
5799
5800         data->rpc_status = task->tk_status;
5801         switch (task->tk_status) {
5802         case 0:
5803                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5804                                 data->timestamp);
5805                 if (data->arg.new_lock) {
5806                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5807                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5808                                 rpc_restart_call_prepare(task);
5809                                 break;
5810                         }
5811                 }
5812                 if (data->arg.new_lock_owner != 0) {
5813                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5814                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5815                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5816                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5817                         rpc_restart_call_prepare(task);
5818                 break;
5819         case -NFS4ERR_BAD_STATEID:
5820         case -NFS4ERR_OLD_STATEID:
5821         case -NFS4ERR_STALE_STATEID:
5822         case -NFS4ERR_EXPIRED:
5823                 if (data->arg.new_lock_owner != 0) {
5824                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5825                                                 &lsp->ls_state->open_stateid))
5826                                 rpc_restart_call_prepare(task);
5827                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5828                                                 &lsp->ls_stateid))
5829                                 rpc_restart_call_prepare(task);
5830         }
5831         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5832 }
5833
5834 static void nfs4_lock_release(void *calldata)
5835 {
5836         struct nfs4_lockdata *data = calldata;
5837
5838         dprintk("%s: begin!\n", __func__);
5839         nfs_free_seqid(data->arg.open_seqid);
5840         if (data->cancelled != 0) {
5841                 struct rpc_task *task;
5842                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5843                                 data->arg.lock_seqid);
5844                 if (!IS_ERR(task))
5845                         rpc_put_task_async(task);
5846                 dprintk("%s: cancelling lock!\n", __func__);
5847         } else
5848                 nfs_free_seqid(data->arg.lock_seqid);
5849         nfs4_put_lock_state(data->lsp);
5850         put_nfs_open_context(data->ctx);
5851         fput(data->fl.fl_file);
5852         kfree(data);
5853         dprintk("%s: done!\n", __func__);
5854 }
5855
5856 static const struct rpc_call_ops nfs4_lock_ops = {
5857         .rpc_call_prepare = nfs4_lock_prepare,
5858         .rpc_call_done = nfs4_lock_done,
5859         .rpc_release = nfs4_lock_release,
5860 };
5861
5862 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5863 {
5864         switch (error) {
5865         case -NFS4ERR_ADMIN_REVOKED:
5866         case -NFS4ERR_BAD_STATEID:
5867                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5868                 if (new_lock_owner != 0 ||
5869                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5870                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5871                 break;
5872         case -NFS4ERR_STALE_STATEID:
5873                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5874         case -NFS4ERR_EXPIRED:
5875                 nfs4_schedule_lease_recovery(server->nfs_client);
5876         };
5877 }
5878
5879 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5880 {
5881         struct nfs4_lockdata *data;
5882         struct rpc_task *task;
5883         struct rpc_message msg = {
5884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5885                 .rpc_cred = state->owner->so_cred,
5886         };
5887         struct rpc_task_setup task_setup_data = {
5888                 .rpc_client = NFS_CLIENT(state->inode),
5889                 .rpc_message = &msg,
5890                 .callback_ops = &nfs4_lock_ops,
5891                 .workqueue = nfsiod_workqueue,
5892                 .flags = RPC_TASK_ASYNC,
5893         };
5894         int ret;
5895
5896         dprintk("%s: begin!\n", __func__);
5897         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5898                         fl->fl_u.nfs4_fl.owner,
5899                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5900         if (data == NULL)
5901                 return -ENOMEM;
5902         if (IS_SETLKW(cmd))
5903                 data->arg.block = 1;
5904         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5905         msg.rpc_argp = &data->arg;
5906         msg.rpc_resp = &data->res;
5907         task_setup_data.callback_data = data;
5908         if (recovery_type > NFS_LOCK_NEW) {
5909                 if (recovery_type == NFS_LOCK_RECLAIM)
5910                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5911                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5912         } else
5913                 data->arg.new_lock = 1;
5914         task = rpc_run_task(&task_setup_data);
5915         if (IS_ERR(task))
5916                 return PTR_ERR(task);
5917         ret = nfs4_wait_for_completion_rpc_task(task);
5918         if (ret == 0) {
5919                 ret = data->rpc_status;
5920                 if (ret)
5921                         nfs4_handle_setlk_error(data->server, data->lsp,
5922                                         data->arg.new_lock_owner, ret);
5923         } else
5924                 data->cancelled = 1;
5925         rpc_put_task(task);
5926         dprintk("%s: done, ret = %d!\n", __func__, ret);
5927         return ret;
5928 }
5929
5930 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5931 {
5932         struct nfs_server *server = NFS_SERVER(state->inode);
5933         struct nfs4_exception exception = {
5934                 .inode = state->inode,
5935         };
5936         int err;
5937
5938         do {
5939                 /* Cache the lock if possible... */
5940                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5941                         return 0;
5942                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5943                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5944                 if (err != -NFS4ERR_DELAY)
5945                         break;
5946                 nfs4_handle_exception(server, err, &exception);
5947         } while (exception.retry);
5948         return err;
5949 }
5950
5951 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5952 {
5953         struct nfs_server *server = NFS_SERVER(state->inode);
5954         struct nfs4_exception exception = {
5955                 .inode = state->inode,
5956         };
5957         int err;
5958
5959         err = nfs4_set_lock_state(state, request);
5960         if (err != 0)
5961                 return err;
5962         if (!recover_lost_locks) {
5963                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5964                 return 0;
5965         }
5966         do {
5967                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5968                         return 0;
5969                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5970                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5971                 switch (err) {
5972                 default:
5973                         goto out;
5974                 case -NFS4ERR_GRACE:
5975                 case -NFS4ERR_DELAY:
5976                         nfs4_handle_exception(server, err, &exception);
5977                         err = 0;
5978                 }
5979         } while (exception.retry);
5980 out:
5981         return err;
5982 }
5983
5984 #if defined(CONFIG_NFS_V4_1)
5985 /**
5986  * nfs41_check_expired_locks - possibly free a lock stateid
5987  *
5988  * @state: NFSv4 state for an inode
5989  *
5990  * Returns NFS_OK if recovery for this stateid is now finished.
5991  * Otherwise a negative NFS4ERR value is returned.
5992  */
5993 static int nfs41_check_expired_locks(struct nfs4_state *state)
5994 {
5995         int status, ret = -NFS4ERR_BAD_STATEID;
5996         struct nfs4_lock_state *lsp;
5997         struct nfs_server *server = NFS_SERVER(state->inode);
5998
5999         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6000                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6001                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6002
6003                         status = nfs41_test_stateid(server,
6004                                         &lsp->ls_stateid,
6005                                         cred);
6006                         trace_nfs4_test_lock_stateid(state, lsp, status);
6007                         if (status != NFS_OK) {
6008                                 /* Free the stateid unless the server
6009                                  * informs us the stateid is unrecognized. */
6010                                 if (status != -NFS4ERR_BAD_STATEID)
6011                                         nfs41_free_stateid(server,
6012                                                         &lsp->ls_stateid,
6013                                                         cred);
6014                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6015                                 ret = status;
6016                         }
6017                 }
6018         };
6019
6020         return ret;
6021 }
6022
6023 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6024 {
6025         int status = NFS_OK;
6026
6027         if (test_bit(LK_STATE_IN_USE, &state->flags))
6028                 status = nfs41_check_expired_locks(state);
6029         if (status != NFS_OK)
6030                 status = nfs4_lock_expired(state, request);
6031         return status;
6032 }
6033 #endif
6034
6035 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6036 {
6037         struct nfs_inode *nfsi = NFS_I(state->inode);
6038         unsigned char fl_flags = request->fl_flags;
6039         int status = -ENOLCK;
6040
6041         if ((fl_flags & FL_POSIX) &&
6042                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6043                 goto out;
6044         /* Is this a delegated open? */
6045         status = nfs4_set_lock_state(state, request);
6046         if (status != 0)
6047                 goto out;
6048         request->fl_flags |= FL_ACCESS;
6049         status = do_vfs_lock(state->inode, request);
6050         if (status < 0)
6051                 goto out;
6052         down_read(&nfsi->rwsem);
6053         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6054                 /* Yes: cache locks! */
6055                 /* ...but avoid races with delegation recall... */
6056                 request->fl_flags = fl_flags & ~FL_SLEEP;
6057                 status = do_vfs_lock(state->inode, request);
6058                 up_read(&nfsi->rwsem);
6059                 goto out;
6060         }
6061         up_read(&nfsi->rwsem);
6062         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6063 out:
6064         request->fl_flags = fl_flags;
6065         return status;
6066 }
6067
6068 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6069 {
6070         struct nfs4_exception exception = {
6071                 .state = state,
6072                 .inode = state->inode,
6073         };
6074         int err;
6075
6076         do {
6077                 err = _nfs4_proc_setlk(state, cmd, request);
6078                 trace_nfs4_set_lock(request, state, cmd, err);
6079                 if (err == -NFS4ERR_DENIED)
6080                         err = -EAGAIN;
6081                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6082                                 err, &exception);
6083         } while (exception.retry);
6084         return err;
6085 }
6086
6087 static int
6088 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6089 {
6090         struct nfs_open_context *ctx;
6091         struct nfs4_state *state;
6092         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6093         int status;
6094
6095         /* verify open state */
6096         ctx = nfs_file_open_context(filp);
6097         state = ctx->state;
6098
6099         if (request->fl_start < 0 || request->fl_end < 0)
6100                 return -EINVAL;
6101
6102         if (IS_GETLK(cmd)) {
6103                 if (state != NULL)
6104                         return nfs4_proc_getlk(state, F_GETLK, request);
6105                 return 0;
6106         }
6107
6108         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6109                 return -EINVAL;
6110
6111         if (request->fl_type == F_UNLCK) {
6112                 if (state != NULL)
6113                         return nfs4_proc_unlck(state, cmd, request);
6114                 return 0;
6115         }
6116
6117         if (state == NULL)
6118                 return -ENOLCK;
6119         /*
6120          * Don't rely on the VFS having checked the file open mode,
6121          * since it won't do this for flock() locks.
6122          */
6123         switch (request->fl_type) {
6124         case F_RDLCK:
6125                 if (!(filp->f_mode & FMODE_READ))
6126                         return -EBADF;
6127                 break;
6128         case F_WRLCK:
6129                 if (!(filp->f_mode & FMODE_WRITE))
6130                         return -EBADF;
6131         }
6132
6133         do {
6134                 status = nfs4_proc_setlk(state, cmd, request);
6135                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6136                         break;
6137                 timeout = nfs4_set_lock_task_retry(timeout);
6138                 status = -ERESTARTSYS;
6139                 if (signalled())
6140                         break;
6141         } while(status < 0);
6142         return status;
6143 }
6144
6145 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6146 {
6147         struct nfs_server *server = NFS_SERVER(state->inode);
6148         int err;
6149
6150         err = nfs4_set_lock_state(state, fl);
6151         if (err != 0)
6152                 return err;
6153         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6154         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6155 }
6156
6157 struct nfs_release_lockowner_data {
6158         struct nfs4_lock_state *lsp;
6159         struct nfs_server *server;
6160         struct nfs_release_lockowner_args args;
6161         struct nfs_release_lockowner_res res;
6162         unsigned long timestamp;
6163 };
6164
6165 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6166 {
6167         struct nfs_release_lockowner_data *data = calldata;
6168         struct nfs_server *server = data->server;
6169         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6170                              &data->args.seq_args, &data->res.seq_res, task);
6171         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6172         data->timestamp = jiffies;
6173 }
6174
6175 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6176 {
6177         struct nfs_release_lockowner_data *data = calldata;
6178         struct nfs_server *server = data->server;
6179
6180         nfs40_sequence_done(task, &data->res.seq_res);
6181
6182         switch (task->tk_status) {
6183         case 0:
6184                 renew_lease(server, data->timestamp);
6185                 break;
6186         case -NFS4ERR_STALE_CLIENTID:
6187         case -NFS4ERR_EXPIRED:
6188                 nfs4_schedule_lease_recovery(server->nfs_client);
6189                 break;
6190         case -NFS4ERR_LEASE_MOVED:
6191         case -NFS4ERR_DELAY:
6192                 if (nfs4_async_handle_error(task, server,
6193                                             NULL, NULL) == -EAGAIN)
6194                         rpc_restart_call_prepare(task);
6195         }
6196 }
6197
6198 static void nfs4_release_lockowner_release(void *calldata)
6199 {
6200         struct nfs_release_lockowner_data *data = calldata;
6201         nfs4_free_lock_state(data->server, data->lsp);
6202         kfree(calldata);
6203 }
6204
6205 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6206         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6207         .rpc_call_done = nfs4_release_lockowner_done,
6208         .rpc_release = nfs4_release_lockowner_release,
6209 };
6210
6211 static void
6212 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6213 {
6214         struct nfs_release_lockowner_data *data;
6215         struct rpc_message msg = {
6216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6217         };
6218
6219         if (server->nfs_client->cl_mvops->minor_version != 0)
6220                 return;
6221
6222         data = kmalloc(sizeof(*data), GFP_NOFS);
6223         if (!data)
6224                 return;
6225         data->lsp = lsp;
6226         data->server = server;
6227         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6228         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6229         data->args.lock_owner.s_dev = server->s_dev;
6230
6231         msg.rpc_argp = &data->args;
6232         msg.rpc_resp = &data->res;
6233         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6234         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6235 }
6236
6237 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6238
6239 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6240                                    const void *buf, size_t buflen,
6241                                    int flags, int type)
6242 {
6243         if (strcmp(key, "") != 0)
6244                 return -EINVAL;
6245
6246         return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6247 }
6248
6249 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6250                                    void *buf, size_t buflen, int type)
6251 {
6252         if (strcmp(key, "") != 0)
6253                 return -EINVAL;
6254
6255         return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
6256 }
6257
6258 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6259                                        size_t list_len, const char *name,
6260                                        size_t name_len, int type)
6261 {
6262         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6263
6264         if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
6265                 return 0;
6266
6267         if (list && len <= list_len)
6268                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6269         return len;
6270 }
6271
6272 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6273 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6274 {
6275         return server->caps & NFS_CAP_SECURITY_LABEL;
6276 }
6277
6278 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6279                                    const void *buf, size_t buflen,
6280                                    int flags, int type)
6281 {
6282         if (security_ismaclabel(key))
6283                 return nfs4_set_security_label(dentry, buf, buflen);
6284
6285         return -EOPNOTSUPP;
6286 }
6287
6288 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6289                                    void *buf, size_t buflen, int type)
6290 {
6291         if (security_ismaclabel(key))
6292                 return nfs4_get_security_label(d_inode(dentry), buf, buflen);
6293         return -EOPNOTSUPP;
6294 }
6295
6296 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6297                                        size_t list_len, const char *name,
6298                                        size_t name_len, int type)
6299 {
6300         size_t len = 0;
6301
6302         if (nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) {
6303                 len = security_inode_listsecurity(d_inode(dentry), NULL, 0);
6304                 if (list && len <= list_len)
6305                         security_inode_listsecurity(d_inode(dentry), list, len);
6306         }
6307         return len;
6308 }
6309
6310 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6311         .prefix = XATTR_SECURITY_PREFIX,
6312         .list   = nfs4_xattr_list_nfs4_label,
6313         .get    = nfs4_xattr_get_nfs4_label,
6314         .set    = nfs4_xattr_set_nfs4_label,
6315 };
6316 #endif
6317
6318
6319 /*
6320  * nfs_fhget will use either the mounted_on_fileid or the fileid
6321  */
6322 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6323 {
6324         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6325                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6326               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6327               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6328                 return;
6329
6330         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6331                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6332         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6333         fattr->nlink = 2;
6334 }
6335
6336 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6337                                    const struct qstr *name,
6338                                    struct nfs4_fs_locations *fs_locations,
6339                                    struct page *page)
6340 {
6341         struct nfs_server *server = NFS_SERVER(dir);
6342         u32 bitmask[3] = {
6343                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6344         };
6345         struct nfs4_fs_locations_arg args = {
6346                 .dir_fh = NFS_FH(dir),
6347                 .name = name,
6348                 .page = page,
6349                 .bitmask = bitmask,
6350         };
6351         struct nfs4_fs_locations_res res = {
6352                 .fs_locations = fs_locations,
6353         };
6354         struct rpc_message msg = {
6355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6356                 .rpc_argp = &args,
6357                 .rpc_resp = &res,
6358         };
6359         int status;
6360
6361         dprintk("%s: start\n", __func__);
6362
6363         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6364          * is not supported */
6365         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6366                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6367         else
6368                 bitmask[0] |= FATTR4_WORD0_FILEID;
6369
6370         nfs_fattr_init(&fs_locations->fattr);
6371         fs_locations->server = server;
6372         fs_locations->nlocations = 0;
6373         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6374         dprintk("%s: returned status = %d\n", __func__, status);
6375         return status;
6376 }
6377
6378 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6379                            const struct qstr *name,
6380                            struct nfs4_fs_locations *fs_locations,
6381                            struct page *page)
6382 {
6383         struct nfs4_exception exception = { };
6384         int err;
6385         do {
6386                 err = _nfs4_proc_fs_locations(client, dir, name,
6387                                 fs_locations, page);
6388                 trace_nfs4_get_fs_locations(dir, name, err);
6389                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6390                                 &exception);
6391         } while (exception.retry);
6392         return err;
6393 }
6394
6395 /*
6396  * This operation also signals the server that this client is
6397  * performing migration recovery.  The server can stop returning
6398  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6399  * appended to this compound to identify the client ID which is
6400  * performing recovery.
6401  */
6402 static int _nfs40_proc_get_locations(struct inode *inode,
6403                                      struct nfs4_fs_locations *locations,
6404                                      struct page *page, struct rpc_cred *cred)
6405 {
6406         struct nfs_server *server = NFS_SERVER(inode);
6407         struct rpc_clnt *clnt = server->client;
6408         u32 bitmask[2] = {
6409                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6410         };
6411         struct nfs4_fs_locations_arg args = {
6412                 .clientid       = server->nfs_client->cl_clientid,
6413                 .fh             = NFS_FH(inode),
6414                 .page           = page,
6415                 .bitmask        = bitmask,
6416                 .migration      = 1,            /* skip LOOKUP */
6417                 .renew          = 1,            /* append RENEW */
6418         };
6419         struct nfs4_fs_locations_res res = {
6420                 .fs_locations   = locations,
6421                 .migration      = 1,
6422                 .renew          = 1,
6423         };
6424         struct rpc_message msg = {
6425                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6426                 .rpc_argp       = &args,
6427                 .rpc_resp       = &res,
6428                 .rpc_cred       = cred,
6429         };
6430         unsigned long now = jiffies;
6431         int status;
6432
6433         nfs_fattr_init(&locations->fattr);
6434         locations->server = server;
6435         locations->nlocations = 0;
6436
6437         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6438         nfs4_set_sequence_privileged(&args.seq_args);
6439         status = nfs4_call_sync_sequence(clnt, server, &msg,
6440                                         &args.seq_args, &res.seq_res);
6441         if (status)
6442                 return status;
6443
6444         renew_lease(server, now);
6445         return 0;
6446 }
6447
6448 #ifdef CONFIG_NFS_V4_1
6449
6450 /*
6451  * This operation also signals the server that this client is
6452  * performing migration recovery.  The server can stop asserting
6453  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6454  * performing this operation is identified in the SEQUENCE
6455  * operation in this compound.
6456  *
6457  * When the client supports GETATTR(fs_locations_info), it can
6458  * be plumbed in here.
6459  */
6460 static int _nfs41_proc_get_locations(struct inode *inode,
6461                                      struct nfs4_fs_locations *locations,
6462                                      struct page *page, struct rpc_cred *cred)
6463 {
6464         struct nfs_server *server = NFS_SERVER(inode);
6465         struct rpc_clnt *clnt = server->client;
6466         u32 bitmask[2] = {
6467                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6468         };
6469         struct nfs4_fs_locations_arg args = {
6470                 .fh             = NFS_FH(inode),
6471                 .page           = page,
6472                 .bitmask        = bitmask,
6473                 .migration      = 1,            /* skip LOOKUP */
6474         };
6475         struct nfs4_fs_locations_res res = {
6476                 .fs_locations   = locations,
6477                 .migration      = 1,
6478         };
6479         struct rpc_message msg = {
6480                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6481                 .rpc_argp       = &args,
6482                 .rpc_resp       = &res,
6483                 .rpc_cred       = cred,
6484         };
6485         int status;
6486
6487         nfs_fattr_init(&locations->fattr);
6488         locations->server = server;
6489         locations->nlocations = 0;
6490
6491         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6492         nfs4_set_sequence_privileged(&args.seq_args);
6493         status = nfs4_call_sync_sequence(clnt, server, &msg,
6494                                         &args.seq_args, &res.seq_res);
6495         if (status == NFS4_OK &&
6496             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6497                 status = -NFS4ERR_LEASE_MOVED;
6498         return status;
6499 }
6500
6501 #endif  /* CONFIG_NFS_V4_1 */
6502
6503 /**
6504  * nfs4_proc_get_locations - discover locations for a migrated FSID
6505  * @inode: inode on FSID that is migrating
6506  * @locations: result of query
6507  * @page: buffer
6508  * @cred: credential to use for this operation
6509  *
6510  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6511  * operation failed, or a negative errno if a local error occurred.
6512  *
6513  * On success, "locations" is filled in, but if the server has
6514  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6515  * asserted.
6516  *
6517  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6518  * from this client that require migration recovery.
6519  */
6520 int nfs4_proc_get_locations(struct inode *inode,
6521                             struct nfs4_fs_locations *locations,
6522                             struct page *page, struct rpc_cred *cred)
6523 {
6524         struct nfs_server *server = NFS_SERVER(inode);
6525         struct nfs_client *clp = server->nfs_client;
6526         const struct nfs4_mig_recovery_ops *ops =
6527                                         clp->cl_mvops->mig_recovery_ops;
6528         struct nfs4_exception exception = { };
6529         int status;
6530
6531         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6532                 (unsigned long long)server->fsid.major,
6533                 (unsigned long long)server->fsid.minor,
6534                 clp->cl_hostname);
6535         nfs_display_fhandle(NFS_FH(inode), __func__);
6536
6537         do {
6538                 status = ops->get_locations(inode, locations, page, cred);
6539                 if (status != -NFS4ERR_DELAY)
6540                         break;
6541                 nfs4_handle_exception(server, status, &exception);
6542         } while (exception.retry);
6543         return status;
6544 }
6545
6546 /*
6547  * This operation also signals the server that this client is
6548  * performing "lease moved" recovery.  The server can stop
6549  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6550  * is appended to this compound to identify the client ID which is
6551  * performing recovery.
6552  */
6553 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6554 {
6555         struct nfs_server *server = NFS_SERVER(inode);
6556         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6557         struct rpc_clnt *clnt = server->client;
6558         struct nfs4_fsid_present_arg args = {
6559                 .fh             = NFS_FH(inode),
6560                 .clientid       = clp->cl_clientid,
6561                 .renew          = 1,            /* append RENEW */
6562         };
6563         struct nfs4_fsid_present_res res = {
6564                 .renew          = 1,
6565         };
6566         struct rpc_message msg = {
6567                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6568                 .rpc_argp       = &args,
6569                 .rpc_resp       = &res,
6570                 .rpc_cred       = cred,
6571         };
6572         unsigned long now = jiffies;
6573         int status;
6574
6575         res.fh = nfs_alloc_fhandle();
6576         if (res.fh == NULL)
6577                 return -ENOMEM;
6578
6579         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6580         nfs4_set_sequence_privileged(&args.seq_args);
6581         status = nfs4_call_sync_sequence(clnt, server, &msg,
6582                                                 &args.seq_args, &res.seq_res);
6583         nfs_free_fhandle(res.fh);
6584         if (status)
6585                 return status;
6586
6587         do_renew_lease(clp, now);
6588         return 0;
6589 }
6590
6591 #ifdef CONFIG_NFS_V4_1
6592
6593 /*
6594  * This operation also signals the server that this client is
6595  * performing "lease moved" recovery.  The server can stop asserting
6596  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6597  * this operation is identified in the SEQUENCE operation in this
6598  * compound.
6599  */
6600 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6601 {
6602         struct nfs_server *server = NFS_SERVER(inode);
6603         struct rpc_clnt *clnt = server->client;
6604         struct nfs4_fsid_present_arg args = {
6605                 .fh             = NFS_FH(inode),
6606         };
6607         struct nfs4_fsid_present_res res = {
6608         };
6609         struct rpc_message msg = {
6610                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6611                 .rpc_argp       = &args,
6612                 .rpc_resp       = &res,
6613                 .rpc_cred       = cred,
6614         };
6615         int status;
6616
6617         res.fh = nfs_alloc_fhandle();
6618         if (res.fh == NULL)
6619                 return -ENOMEM;
6620
6621         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6622         nfs4_set_sequence_privileged(&args.seq_args);
6623         status = nfs4_call_sync_sequence(clnt, server, &msg,
6624                                                 &args.seq_args, &res.seq_res);
6625         nfs_free_fhandle(res.fh);
6626         if (status == NFS4_OK &&
6627             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6628                 status = -NFS4ERR_LEASE_MOVED;
6629         return status;
6630 }
6631
6632 #endif  /* CONFIG_NFS_V4_1 */
6633
6634 /**
6635  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6636  * @inode: inode on FSID to check
6637  * @cred: credential to use for this operation
6638  *
6639  * Server indicates whether the FSID is present, moved, or not
6640  * recognized.  This operation is necessary to clear a LEASE_MOVED
6641  * condition for this client ID.
6642  *
6643  * Returns NFS4_OK if the FSID is present on this server,
6644  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6645  *  NFS4ERR code if some error occurred on the server, or a
6646  *  negative errno if a local failure occurred.
6647  */
6648 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6649 {
6650         struct nfs_server *server = NFS_SERVER(inode);
6651         struct nfs_client *clp = server->nfs_client;
6652         const struct nfs4_mig_recovery_ops *ops =
6653                                         clp->cl_mvops->mig_recovery_ops;
6654         struct nfs4_exception exception = { };
6655         int status;
6656
6657         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6658                 (unsigned long long)server->fsid.major,
6659                 (unsigned long long)server->fsid.minor,
6660                 clp->cl_hostname);
6661         nfs_display_fhandle(NFS_FH(inode), __func__);
6662
6663         do {
6664                 status = ops->fsid_present(inode, cred);
6665                 if (status != -NFS4ERR_DELAY)
6666                         break;
6667                 nfs4_handle_exception(server, status, &exception);
6668         } while (exception.retry);
6669         return status;
6670 }
6671
6672 /**
6673  * If 'use_integrity' is true and the state managment nfs_client
6674  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6675  * and the machine credential as per RFC3530bis and RFC5661 Security
6676  * Considerations sections. Otherwise, just use the user cred with the
6677  * filesystem's rpc_client.
6678  */
6679 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6680 {
6681         int status;
6682         struct nfs4_secinfo_arg args = {
6683                 .dir_fh = NFS_FH(dir),
6684                 .name   = name,
6685         };
6686         struct nfs4_secinfo_res res = {
6687                 .flavors     = flavors,
6688         };
6689         struct rpc_message msg = {
6690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6691                 .rpc_argp = &args,
6692                 .rpc_resp = &res,
6693         };
6694         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6695         struct rpc_cred *cred = NULL;
6696
6697         if (use_integrity) {
6698                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6699                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6700                 msg.rpc_cred = cred;
6701         }
6702
6703         dprintk("NFS call  secinfo %s\n", name->name);
6704
6705         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6706                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6707
6708         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6709                                 &res.seq_res, 0);
6710         dprintk("NFS reply  secinfo: %d\n", status);
6711
6712         if (cred)
6713                 put_rpccred(cred);
6714
6715         return status;
6716 }
6717
6718 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6719                       struct nfs4_secinfo_flavors *flavors)
6720 {
6721         struct nfs4_exception exception = { };
6722         int err;
6723         do {
6724                 err = -NFS4ERR_WRONGSEC;
6725
6726                 /* try to use integrity protection with machine cred */
6727                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6728                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6729
6730                 /*
6731                  * if unable to use integrity protection, or SECINFO with
6732                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6733                  * disallowed by spec, but exists in deployed servers) use
6734                  * the current filesystem's rpc_client and the user cred.
6735                  */
6736                 if (err == -NFS4ERR_WRONGSEC)
6737                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6738
6739                 trace_nfs4_secinfo(dir, name, err);
6740                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6741                                 &exception);
6742         } while (exception.retry);
6743         return err;
6744 }
6745
6746 #ifdef CONFIG_NFS_V4_1
6747 /*
6748  * Check the exchange flags returned by the server for invalid flags, having
6749  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6750  * DS flags set.
6751  */
6752 static int nfs4_check_cl_exchange_flags(u32 flags)
6753 {
6754         if (flags & ~EXCHGID4_FLAG_MASK_R)
6755                 goto out_inval;
6756         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6757             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6758                 goto out_inval;
6759         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6760                 goto out_inval;
6761         return NFS_OK;
6762 out_inval:
6763         return -NFS4ERR_INVAL;
6764 }
6765
6766 static bool
6767 nfs41_same_server_scope(struct nfs41_server_scope *a,
6768                         struct nfs41_server_scope *b)
6769 {
6770         if (a->server_scope_sz == b->server_scope_sz &&
6771             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6772                 return true;
6773
6774         return false;
6775 }
6776
6777 /*
6778  * nfs4_proc_bind_conn_to_session()
6779  *
6780  * The 4.1 client currently uses the same TCP connection for the
6781  * fore and backchannel.
6782  */
6783 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6784 {
6785         int status;
6786         struct nfs41_bind_conn_to_session_args args = {
6787                 .client = clp,
6788                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6789         };
6790         struct nfs41_bind_conn_to_session_res res;
6791         struct rpc_message msg = {
6792                 .rpc_proc =
6793                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6794                 .rpc_argp = &args,
6795                 .rpc_resp = &res,
6796                 .rpc_cred = cred,
6797         };
6798
6799         dprintk("--> %s\n", __func__);
6800
6801         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6802         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6803                 args.dir = NFS4_CDFC4_FORE;
6804
6805         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6806         trace_nfs4_bind_conn_to_session(clp, status);
6807         if (status == 0) {
6808                 if (memcmp(res.sessionid.data,
6809                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6810                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6811                         status = -EIO;
6812                         goto out;
6813                 }
6814                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6815                         dprintk("NFS: %s: Unexpected direction from server\n",
6816                                 __func__);
6817                         status = -EIO;
6818                         goto out;
6819                 }
6820                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6821                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6822                                 __func__);
6823                         status = -EIO;
6824                         goto out;
6825                 }
6826         }
6827 out:
6828         dprintk("<-- %s status= %d\n", __func__, status);
6829         return status;
6830 }
6831
6832 /*
6833  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6834  * and operations we'd like to see to enable certain features in the allow map
6835  */
6836 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6837         .how = SP4_MACH_CRED,
6838         .enforce.u.words = {
6839                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6840                       1 << (OP_EXCHANGE_ID - 32) |
6841                       1 << (OP_CREATE_SESSION - 32) |
6842                       1 << (OP_DESTROY_SESSION - 32) |
6843                       1 << (OP_DESTROY_CLIENTID - 32)
6844         },
6845         .allow.u.words = {
6846                 [0] = 1 << (OP_CLOSE) |
6847                       1 << (OP_LOCKU) |
6848                       1 << (OP_COMMIT),
6849                 [1] = 1 << (OP_SECINFO - 32) |
6850                       1 << (OP_SECINFO_NO_NAME - 32) |
6851                       1 << (OP_TEST_STATEID - 32) |
6852                       1 << (OP_FREE_STATEID - 32) |
6853                       1 << (OP_WRITE - 32)
6854         }
6855 };
6856
6857 /*
6858  * Select the state protection mode for client `clp' given the server results
6859  * from exchange_id in `sp'.
6860  *
6861  * Returns 0 on success, negative errno otherwise.
6862  */
6863 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6864                                  struct nfs41_state_protection *sp)
6865 {
6866         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6867                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6868                       1 << (OP_EXCHANGE_ID - 32) |
6869                       1 << (OP_CREATE_SESSION - 32) |
6870                       1 << (OP_DESTROY_SESSION - 32) |
6871                       1 << (OP_DESTROY_CLIENTID - 32)
6872         };
6873         unsigned int i;
6874
6875         if (sp->how == SP4_MACH_CRED) {
6876                 /* Print state protect result */
6877                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6878                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6879                         if (test_bit(i, sp->enforce.u.longs))
6880                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6881                         if (test_bit(i, sp->allow.u.longs))
6882                                 dfprintk(MOUNT, "  allow op %d\n", i);
6883                 }
6884
6885                 /* make sure nothing is on enforce list that isn't supported */
6886                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6887                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6888                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6889                                 return -EINVAL;
6890                         }
6891                 }
6892
6893                 /*
6894                  * Minimal mode - state operations are allowed to use machine
6895                  * credential.  Note this already happens by default, so the
6896                  * client doesn't have to do anything more than the negotiation.
6897                  *
6898                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6899                  *       we're already using the machine cred for exchange_id
6900                  *       and will never use a different cred.
6901                  */
6902                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6903                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6904                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6905                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6906                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6907                         dfprintk(MOUNT, "  minimal mode enabled\n");
6908                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6909                 } else {
6910                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6911                         return -EINVAL;
6912                 }
6913
6914                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6915                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6916                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6917                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6918                 }
6919
6920                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6921                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6922                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6923                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6924                 }
6925
6926                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6927                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6928                         dfprintk(MOUNT, "  stateid mode enabled\n");
6929                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6930                 }
6931
6932                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6933                         dfprintk(MOUNT, "  write mode enabled\n");
6934                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6935                 }
6936
6937                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6938                         dfprintk(MOUNT, "  commit mode enabled\n");
6939                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6940                 }
6941         }
6942
6943         return 0;
6944 }
6945
6946 /*
6947  * _nfs4_proc_exchange_id()
6948  *
6949  * Wrapper for EXCHANGE_ID operation.
6950  */
6951 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6952         u32 sp4_how)
6953 {
6954         nfs4_verifier verifier;
6955         struct nfs41_exchange_id_args args = {
6956                 .verifier = &verifier,
6957                 .client = clp,
6958 #ifdef CONFIG_NFS_V4_1_MIGRATION
6959                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6960                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6961                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6962 #else
6963                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6964                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6965 #endif
6966         };
6967         struct nfs41_exchange_id_res res = {
6968                 0
6969         };
6970         int status;
6971         struct rpc_message msg = {
6972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6973                 .rpc_argp = &args,
6974                 .rpc_resp = &res,
6975                 .rpc_cred = cred,
6976         };
6977
6978         nfs4_init_boot_verifier(clp, &verifier);
6979
6980         status = nfs4_init_uniform_client_string(clp);
6981         if (status)
6982                 goto out;
6983
6984         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
6985                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6986                 clp->cl_owner_id);
6987
6988         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6989                                         GFP_NOFS);
6990         if (unlikely(res.server_owner == NULL)) {
6991                 status = -ENOMEM;
6992                 goto out;
6993         }
6994
6995         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6996                                         GFP_NOFS);
6997         if (unlikely(res.server_scope == NULL)) {
6998                 status = -ENOMEM;
6999                 goto out_server_owner;
7000         }
7001
7002         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7003         if (unlikely(res.impl_id == NULL)) {
7004                 status = -ENOMEM;
7005                 goto out_server_scope;
7006         }
7007
7008         switch (sp4_how) {
7009         case SP4_NONE:
7010                 args.state_protect.how = SP4_NONE;
7011                 break;
7012
7013         case SP4_MACH_CRED:
7014                 args.state_protect = nfs4_sp4_mach_cred_request;
7015                 break;
7016
7017         default:
7018                 /* unsupported! */
7019                 WARN_ON_ONCE(1);
7020                 status = -EINVAL;
7021                 goto out_impl_id;
7022         }
7023
7024         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7025         trace_nfs4_exchange_id(clp, status);
7026         if (status == 0)
7027                 status = nfs4_check_cl_exchange_flags(res.flags);
7028
7029         if (status == 0)
7030                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7031
7032         if (status == 0) {
7033                 clp->cl_clientid = res.clientid;
7034                 clp->cl_exchange_flags = res.flags;
7035                 /* Client ID is not confirmed */
7036                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7037                         clear_bit(NFS4_SESSION_ESTABLISHED,
7038                                         &clp->cl_session->session_state);
7039                         clp->cl_seqid = res.seqid;
7040                 }
7041
7042                 kfree(clp->cl_serverowner);
7043                 clp->cl_serverowner = res.server_owner;
7044                 res.server_owner = NULL;
7045
7046                 /* use the most recent implementation id */
7047                 kfree(clp->cl_implid);
7048                 clp->cl_implid = res.impl_id;
7049                 res.impl_id = NULL;
7050
7051                 if (clp->cl_serverscope != NULL &&
7052                     !nfs41_same_server_scope(clp->cl_serverscope,
7053                                              res.server_scope)) {
7054                         dprintk("%s: server_scope mismatch detected\n",
7055                                 __func__);
7056                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7057                         kfree(clp->cl_serverscope);
7058                         clp->cl_serverscope = NULL;
7059                 }
7060
7061                 if (clp->cl_serverscope == NULL) {
7062                         clp->cl_serverscope = res.server_scope;
7063                         res.server_scope = NULL;
7064                 }
7065         }
7066
7067 out_impl_id:
7068         kfree(res.impl_id);
7069 out_server_scope:
7070         kfree(res.server_scope);
7071 out_server_owner:
7072         kfree(res.server_owner);
7073 out:
7074         if (clp->cl_implid != NULL)
7075                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7076                         "domain: %s, name: %s, date: %llu,%u\n",
7077                         clp->cl_implid->domain, clp->cl_implid->name,
7078                         clp->cl_implid->date.seconds,
7079                         clp->cl_implid->date.nseconds);
7080         dprintk("NFS reply exchange_id: %d\n", status);
7081         return status;
7082 }
7083
7084 /*
7085  * nfs4_proc_exchange_id()
7086  *
7087  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7088  *
7089  * Since the clientid has expired, all compounds using sessions
7090  * associated with the stale clientid will be returning
7091  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7092  * be in some phase of session reset.
7093  *
7094  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7095  */
7096 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7097 {
7098         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7099         int status;
7100
7101         /* try SP4_MACH_CRED if krb5i/p */
7102         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7103             authflavor == RPC_AUTH_GSS_KRB5P) {
7104                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7105                 if (!status)
7106                         return 0;
7107         }
7108
7109         /* try SP4_NONE */
7110         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7111 }
7112
7113 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7114                 struct rpc_cred *cred)
7115 {
7116         struct rpc_message msg = {
7117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7118                 .rpc_argp = clp,
7119                 .rpc_cred = cred,
7120         };
7121         int status;
7122
7123         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7124         trace_nfs4_destroy_clientid(clp, status);
7125         if (status)
7126                 dprintk("NFS: Got error %d from the server %s on "
7127                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7128         return status;
7129 }
7130
7131 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7132                 struct rpc_cred *cred)
7133 {
7134         unsigned int loop;
7135         int ret;
7136
7137         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7138                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7139                 switch (ret) {
7140                 case -NFS4ERR_DELAY:
7141                 case -NFS4ERR_CLIENTID_BUSY:
7142                         ssleep(1);
7143                         break;
7144                 default:
7145                         return ret;
7146                 }
7147         }
7148         return 0;
7149 }
7150
7151 int nfs4_destroy_clientid(struct nfs_client *clp)
7152 {
7153         struct rpc_cred *cred;
7154         int ret = 0;
7155
7156         if (clp->cl_mvops->minor_version < 1)
7157                 goto out;
7158         if (clp->cl_exchange_flags == 0)
7159                 goto out;
7160         if (clp->cl_preserve_clid)
7161                 goto out;
7162         cred = nfs4_get_clid_cred(clp);
7163         ret = nfs4_proc_destroy_clientid(clp, cred);
7164         if (cred)
7165                 put_rpccred(cred);
7166         switch (ret) {
7167         case 0:
7168         case -NFS4ERR_STALE_CLIENTID:
7169                 clp->cl_exchange_flags = 0;
7170         }
7171 out:
7172         return ret;
7173 }
7174
7175 struct nfs4_get_lease_time_data {
7176         struct nfs4_get_lease_time_args *args;
7177         struct nfs4_get_lease_time_res *res;
7178         struct nfs_client *clp;
7179 };
7180
7181 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7182                                         void *calldata)
7183 {
7184         struct nfs4_get_lease_time_data *data =
7185                         (struct nfs4_get_lease_time_data *)calldata;
7186
7187         dprintk("--> %s\n", __func__);
7188         /* just setup sequence, do not trigger session recovery
7189            since we're invoked within one */
7190         nfs41_setup_sequence(data->clp->cl_session,
7191                         &data->args->la_seq_args,
7192                         &data->res->lr_seq_res,
7193                         task);
7194         dprintk("<-- %s\n", __func__);
7195 }
7196
7197 /*
7198  * Called from nfs4_state_manager thread for session setup, so don't recover
7199  * from sequence operation or clientid errors.
7200  */
7201 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7202 {
7203         struct nfs4_get_lease_time_data *data =
7204                         (struct nfs4_get_lease_time_data *)calldata;
7205
7206         dprintk("--> %s\n", __func__);
7207         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7208                 return;
7209         switch (task->tk_status) {
7210         case -NFS4ERR_DELAY:
7211         case -NFS4ERR_GRACE:
7212                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7213                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7214                 task->tk_status = 0;
7215                 /* fall through */
7216         case -NFS4ERR_RETRY_UNCACHED_REP:
7217                 rpc_restart_call_prepare(task);
7218                 return;
7219         }
7220         dprintk("<-- %s\n", __func__);
7221 }
7222
7223 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7224         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7225         .rpc_call_done = nfs4_get_lease_time_done,
7226 };
7227
7228 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7229 {
7230         struct rpc_task *task;
7231         struct nfs4_get_lease_time_args args;
7232         struct nfs4_get_lease_time_res res = {
7233                 .lr_fsinfo = fsinfo,
7234         };
7235         struct nfs4_get_lease_time_data data = {
7236                 .args = &args,
7237                 .res = &res,
7238                 .clp = clp,
7239         };
7240         struct rpc_message msg = {
7241                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7242                 .rpc_argp = &args,
7243                 .rpc_resp = &res,
7244         };
7245         struct rpc_task_setup task_setup = {
7246                 .rpc_client = clp->cl_rpcclient,
7247                 .rpc_message = &msg,
7248                 .callback_ops = &nfs4_get_lease_time_ops,
7249                 .callback_data = &data,
7250                 .flags = RPC_TASK_TIMEOUT,
7251         };
7252         int status;
7253
7254         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7255         nfs4_set_sequence_privileged(&args.la_seq_args);
7256         dprintk("--> %s\n", __func__);
7257         task = rpc_run_task(&task_setup);
7258
7259         if (IS_ERR(task))
7260                 status = PTR_ERR(task);
7261         else {
7262                 status = task->tk_status;
7263                 rpc_put_task(task);
7264         }
7265         dprintk("<-- %s return %d\n", __func__, status);
7266
7267         return status;
7268 }
7269
7270 /*
7271  * Initialize the values to be used by the client in CREATE_SESSION
7272  * If nfs4_init_session set the fore channel request and response sizes,
7273  * use them.
7274  *
7275  * Set the back channel max_resp_sz_cached to zero to force the client to
7276  * always set csa_cachethis to FALSE because the current implementation
7277  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7278  */
7279 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7280 {
7281         unsigned int max_rqst_sz, max_resp_sz;
7282
7283         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7284         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7285
7286         /* Fore channel attributes */
7287         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7288         args->fc_attrs.max_resp_sz = max_resp_sz;
7289         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7290         args->fc_attrs.max_reqs = max_session_slots;
7291
7292         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7293                 "max_ops=%u max_reqs=%u\n",
7294                 __func__,
7295                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7296                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7297
7298         /* Back channel attributes */
7299         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7300         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7301         args->bc_attrs.max_resp_sz_cached = 0;
7302         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7303         args->bc_attrs.max_reqs = 1;
7304
7305         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7306                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7307                 __func__,
7308                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7309                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7310                 args->bc_attrs.max_reqs);
7311 }
7312
7313 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7314                 struct nfs41_create_session_res *res)
7315 {
7316         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7317         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7318
7319         if (rcvd->max_resp_sz > sent->max_resp_sz)
7320                 return -EINVAL;
7321         /*
7322          * Our requested max_ops is the minimum we need; we're not
7323          * prepared to break up compounds into smaller pieces than that.
7324          * So, no point even trying to continue if the server won't
7325          * cooperate:
7326          */
7327         if (rcvd->max_ops < sent->max_ops)
7328                 return -EINVAL;
7329         if (rcvd->max_reqs == 0)
7330                 return -EINVAL;
7331         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7332                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7333         return 0;
7334 }
7335
7336 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7337                 struct nfs41_create_session_res *res)
7338 {
7339         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7340         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7341
7342         if (!(res->flags & SESSION4_BACK_CHAN))
7343                 goto out;
7344         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7345                 return -EINVAL;
7346         if (rcvd->max_resp_sz < sent->max_resp_sz)
7347                 return -EINVAL;
7348         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7349                 return -EINVAL;
7350         /* These would render the backchannel useless: */
7351         if (rcvd->max_ops != sent->max_ops)
7352                 return -EINVAL;
7353         if (rcvd->max_reqs != sent->max_reqs)
7354                 return -EINVAL;
7355 out:
7356         return 0;
7357 }
7358
7359 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7360                                      struct nfs41_create_session_res *res)
7361 {
7362         int ret;
7363
7364         ret = nfs4_verify_fore_channel_attrs(args, res);
7365         if (ret)
7366                 return ret;
7367         return nfs4_verify_back_channel_attrs(args, res);
7368 }
7369
7370 static void nfs4_update_session(struct nfs4_session *session,
7371                 struct nfs41_create_session_res *res)
7372 {
7373         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7374         /* Mark client id and session as being confirmed */
7375         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7376         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7377         session->flags = res->flags;
7378         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7379         if (res->flags & SESSION4_BACK_CHAN)
7380                 memcpy(&session->bc_attrs, &res->bc_attrs,
7381                                 sizeof(session->bc_attrs));
7382 }
7383
7384 static int _nfs4_proc_create_session(struct nfs_client *clp,
7385                 struct rpc_cred *cred)
7386 {
7387         struct nfs4_session *session = clp->cl_session;
7388         struct nfs41_create_session_args args = {
7389                 .client = clp,
7390                 .clientid = clp->cl_clientid,
7391                 .seqid = clp->cl_seqid,
7392                 .cb_program = NFS4_CALLBACK,
7393         };
7394         struct nfs41_create_session_res res;
7395
7396         struct rpc_message msg = {
7397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7398                 .rpc_argp = &args,
7399                 .rpc_resp = &res,
7400                 .rpc_cred = cred,
7401         };
7402         int status;
7403
7404         nfs4_init_channel_attrs(&args);
7405         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7406
7407         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7408         trace_nfs4_create_session(clp, status);
7409
7410         if (!status) {
7411                 /* Verify the session's negotiated channel_attrs values */
7412                 status = nfs4_verify_channel_attrs(&args, &res);
7413                 /* Increment the clientid slot sequence id */
7414                 if (clp->cl_seqid == res.seqid)
7415                         clp->cl_seqid++;
7416                 if (status)
7417                         goto out;
7418                 nfs4_update_session(session, &res);
7419         }
7420 out:
7421         return status;
7422 }
7423
7424 /*
7425  * Issues a CREATE_SESSION operation to the server.
7426  * It is the responsibility of the caller to verify the session is
7427  * expired before calling this routine.
7428  */
7429 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7430 {
7431         int status;
7432         unsigned *ptr;
7433         struct nfs4_session *session = clp->cl_session;
7434
7435         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7436
7437         status = _nfs4_proc_create_session(clp, cred);
7438         if (status)
7439                 goto out;
7440
7441         /* Init or reset the session slot tables */
7442         status = nfs4_setup_session_slot_tables(session);
7443         dprintk("slot table setup returned %d\n", status);
7444         if (status)
7445                 goto out;
7446
7447         ptr = (unsigned *)&session->sess_id.data[0];
7448         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7449                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7450 out:
7451         dprintk("<-- %s\n", __func__);
7452         return status;
7453 }
7454
7455 /*
7456  * Issue the over-the-wire RPC DESTROY_SESSION.
7457  * The caller must serialize access to this routine.
7458  */
7459 int nfs4_proc_destroy_session(struct nfs4_session *session,
7460                 struct rpc_cred *cred)
7461 {
7462         struct rpc_message msg = {
7463                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7464                 .rpc_argp = session,
7465                 .rpc_cred = cred,
7466         };
7467         int status = 0;
7468
7469         dprintk("--> nfs4_proc_destroy_session\n");
7470
7471         /* session is still being setup */
7472         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7473                 return 0;
7474
7475         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7476         trace_nfs4_destroy_session(session->clp, status);
7477
7478         if (status)
7479                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7480                         "Session has been destroyed regardless...\n", status);
7481
7482         dprintk("<-- nfs4_proc_destroy_session\n");
7483         return status;
7484 }
7485
7486 /*
7487  * Renew the cl_session lease.
7488  */
7489 struct nfs4_sequence_data {
7490         struct nfs_client *clp;
7491         struct nfs4_sequence_args args;
7492         struct nfs4_sequence_res res;
7493 };
7494
7495 static void nfs41_sequence_release(void *data)
7496 {
7497         struct nfs4_sequence_data *calldata = data;
7498         struct nfs_client *clp = calldata->clp;
7499
7500         if (atomic_read(&clp->cl_count) > 1)
7501                 nfs4_schedule_state_renewal(clp);
7502         nfs_put_client(clp);
7503         kfree(calldata);
7504 }
7505
7506 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7507 {
7508         switch(task->tk_status) {
7509         case -NFS4ERR_DELAY:
7510                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7511                 return -EAGAIN;
7512         default:
7513                 nfs4_schedule_lease_recovery(clp);
7514         }
7515         return 0;
7516 }
7517
7518 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7519 {
7520         struct nfs4_sequence_data *calldata = data;
7521         struct nfs_client *clp = calldata->clp;
7522
7523         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7524                 return;
7525
7526         trace_nfs4_sequence(clp, task->tk_status);
7527         if (task->tk_status < 0) {
7528                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7529                 if (atomic_read(&clp->cl_count) == 1)
7530                         goto out;
7531
7532                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7533                         rpc_restart_call_prepare(task);
7534                         return;
7535                 }
7536         }
7537         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7538 out:
7539         dprintk("<-- %s\n", __func__);
7540 }
7541
7542 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7543 {
7544         struct nfs4_sequence_data *calldata = data;
7545         struct nfs_client *clp = calldata->clp;
7546         struct nfs4_sequence_args *args;
7547         struct nfs4_sequence_res *res;
7548
7549         args = task->tk_msg.rpc_argp;
7550         res = task->tk_msg.rpc_resp;
7551
7552         nfs41_setup_sequence(clp->cl_session, args, res, task);
7553 }
7554
7555 static const struct rpc_call_ops nfs41_sequence_ops = {
7556         .rpc_call_done = nfs41_sequence_call_done,
7557         .rpc_call_prepare = nfs41_sequence_prepare,
7558         .rpc_release = nfs41_sequence_release,
7559 };
7560
7561 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7562                 struct rpc_cred *cred,
7563                 bool is_privileged)
7564 {
7565         struct nfs4_sequence_data *calldata;
7566         struct rpc_message msg = {
7567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7568                 .rpc_cred = cred,
7569         };
7570         struct rpc_task_setup task_setup_data = {
7571                 .rpc_client = clp->cl_rpcclient,
7572                 .rpc_message = &msg,
7573                 .callback_ops = &nfs41_sequence_ops,
7574                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7575         };
7576
7577         if (!atomic_inc_not_zero(&clp->cl_count))
7578                 return ERR_PTR(-EIO);
7579         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7580         if (calldata == NULL) {
7581                 nfs_put_client(clp);
7582                 return ERR_PTR(-ENOMEM);
7583         }
7584         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7585         if (is_privileged)
7586                 nfs4_set_sequence_privileged(&calldata->args);
7587         msg.rpc_argp = &calldata->args;
7588         msg.rpc_resp = &calldata->res;
7589         calldata->clp = clp;
7590         task_setup_data.callback_data = calldata;
7591
7592         return rpc_run_task(&task_setup_data);
7593 }
7594
7595 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7596 {
7597         struct rpc_task *task;
7598         int ret = 0;
7599
7600         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7601                 return -EAGAIN;
7602         task = _nfs41_proc_sequence(clp, cred, false);
7603         if (IS_ERR(task))
7604                 ret = PTR_ERR(task);
7605         else
7606                 rpc_put_task_async(task);
7607         dprintk("<-- %s status=%d\n", __func__, ret);
7608         return ret;
7609 }
7610
7611 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7612 {
7613         struct rpc_task *task;
7614         int ret;
7615
7616         task = _nfs41_proc_sequence(clp, cred, true);
7617         if (IS_ERR(task)) {
7618                 ret = PTR_ERR(task);
7619                 goto out;
7620         }
7621         ret = rpc_wait_for_completion_task(task);
7622         if (!ret)
7623                 ret = task->tk_status;
7624         rpc_put_task(task);
7625 out:
7626         dprintk("<-- %s status=%d\n", __func__, ret);
7627         return ret;
7628 }
7629
7630 struct nfs4_reclaim_complete_data {
7631         struct nfs_client *clp;
7632         struct nfs41_reclaim_complete_args arg;
7633         struct nfs41_reclaim_complete_res res;
7634 };
7635
7636 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7637 {
7638         struct nfs4_reclaim_complete_data *calldata = data;
7639
7640         nfs41_setup_sequence(calldata->clp->cl_session,
7641                         &calldata->arg.seq_args,
7642                         &calldata->res.seq_res,
7643                         task);
7644 }
7645
7646 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7647 {
7648         switch(task->tk_status) {
7649         case 0:
7650         case -NFS4ERR_COMPLETE_ALREADY:
7651         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7652                 break;
7653         case -NFS4ERR_DELAY:
7654                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7655                 /* fall through */
7656         case -NFS4ERR_RETRY_UNCACHED_REP:
7657                 return -EAGAIN;
7658         default:
7659                 nfs4_schedule_lease_recovery(clp);
7660         }
7661         return 0;
7662 }
7663
7664 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7665 {
7666         struct nfs4_reclaim_complete_data *calldata = data;
7667         struct nfs_client *clp = calldata->clp;
7668         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7669
7670         dprintk("--> %s\n", __func__);
7671         if (!nfs41_sequence_done(task, res))
7672                 return;
7673
7674         trace_nfs4_reclaim_complete(clp, task->tk_status);
7675         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7676                 rpc_restart_call_prepare(task);
7677                 return;
7678         }
7679         dprintk("<-- %s\n", __func__);
7680 }
7681
7682 static void nfs4_free_reclaim_complete_data(void *data)
7683 {
7684         struct nfs4_reclaim_complete_data *calldata = data;
7685
7686         kfree(calldata);
7687 }
7688
7689 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7690         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7691         .rpc_call_done = nfs4_reclaim_complete_done,
7692         .rpc_release = nfs4_free_reclaim_complete_data,
7693 };
7694
7695 /*
7696  * Issue a global reclaim complete.
7697  */
7698 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7699                 struct rpc_cred *cred)
7700 {
7701         struct nfs4_reclaim_complete_data *calldata;
7702         struct rpc_task *task;
7703         struct rpc_message msg = {
7704                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7705                 .rpc_cred = cred,
7706         };
7707         struct rpc_task_setup task_setup_data = {
7708                 .rpc_client = clp->cl_rpcclient,
7709                 .rpc_message = &msg,
7710                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7711                 .flags = RPC_TASK_ASYNC,
7712         };
7713         int status = -ENOMEM;
7714
7715         dprintk("--> %s\n", __func__);
7716         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7717         if (calldata == NULL)
7718                 goto out;
7719         calldata->clp = clp;
7720         calldata->arg.one_fs = 0;
7721
7722         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7723         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7724         msg.rpc_argp = &calldata->arg;
7725         msg.rpc_resp = &calldata->res;
7726         task_setup_data.callback_data = calldata;
7727         task = rpc_run_task(&task_setup_data);
7728         if (IS_ERR(task)) {
7729                 status = PTR_ERR(task);
7730                 goto out;
7731         }
7732         status = nfs4_wait_for_completion_rpc_task(task);
7733         if (status == 0)
7734                 status = task->tk_status;
7735         rpc_put_task(task);
7736         return 0;
7737 out:
7738         dprintk("<-- %s status=%d\n", __func__, status);
7739         return status;
7740 }
7741
7742 static void
7743 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7744 {
7745         struct nfs4_layoutget *lgp = calldata;
7746         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7747         struct nfs4_session *session = nfs4_get_session(server);
7748
7749         dprintk("--> %s\n", __func__);
7750         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7751          * right now covering the LAYOUTGET we are about to send.
7752          * However, that is not so catastrophic, and there seems
7753          * to be no way to prevent it completely.
7754          */
7755         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7756                                 &lgp->res.seq_res, task))
7757                 return;
7758         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7759                                           NFS_I(lgp->args.inode)->layout,
7760                                           &lgp->args.range,
7761                                           lgp->args.ctx->state)) {
7762                 rpc_exit(task, NFS4_OK);
7763         }
7764 }
7765
7766 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7767 {
7768         struct nfs4_layoutget *lgp = calldata;
7769         struct inode *inode = lgp->args.inode;
7770         struct nfs_server *server = NFS_SERVER(inode);
7771         struct pnfs_layout_hdr *lo;
7772         struct nfs4_state *state = NULL;
7773         unsigned long timeo, now, giveup;
7774
7775         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7776
7777         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7778                 goto out;
7779
7780         switch (task->tk_status) {
7781         case 0:
7782                 goto out;
7783         /*
7784          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7785          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7786          */
7787         case -NFS4ERR_BADLAYOUT:
7788                 goto out_overflow;
7789         /*
7790          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7791          * (or clients) writing to the same RAID stripe except when
7792          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7793          */
7794         case -NFS4ERR_LAYOUTTRYLATER:
7795                 if (lgp->args.minlength == 0)
7796                         goto out_overflow;
7797         /*
7798          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7799          * existing layout before getting a new one).
7800          */
7801         case -NFS4ERR_RECALLCONFLICT:
7802                 timeo = rpc_get_timeout(task->tk_client);
7803                 giveup = lgp->args.timestamp + timeo;
7804                 now = jiffies;
7805                 if (time_after(giveup, now)) {
7806                         unsigned long delay;
7807
7808                         /* Delay for:
7809                          * - Not less then NFS4_POLL_RETRY_MIN.
7810                          * - One last time a jiffie before we give up
7811                          * - exponential backoff (time_now minus start_attempt)
7812                          */
7813                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7814                                     min((giveup - now - 1),
7815                                         now - lgp->args.timestamp));
7816
7817                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7818                                 __func__, delay);
7819                         rpc_delay(task, delay);
7820                         task->tk_status = 0;
7821                         rpc_restart_call_prepare(task);
7822                         goto out; /* Do not call nfs4_async_handle_error() */
7823                 }
7824                 break;
7825         case -NFS4ERR_EXPIRED:
7826         case -NFS4ERR_BAD_STATEID:
7827                 spin_lock(&inode->i_lock);
7828                 lo = NFS_I(inode)->layout;
7829                 if (!lo || list_empty(&lo->plh_segs)) {
7830                         spin_unlock(&inode->i_lock);
7831                         /* If the open stateid was bad, then recover it. */
7832                         state = lgp->args.ctx->state;
7833                 } else {
7834                         LIST_HEAD(head);
7835
7836                         /*
7837                          * Mark the bad layout state as invalid, then retry
7838                          * with the current stateid.
7839                          */
7840                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7841                         spin_unlock(&inode->i_lock);
7842                         pnfs_free_lseg_list(&head);
7843
7844                         task->tk_status = 0;
7845                         rpc_restart_call_prepare(task);
7846                 }
7847         }
7848         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7849                 rpc_restart_call_prepare(task);
7850 out:
7851         dprintk("<-- %s\n", __func__);
7852         return;
7853 out_overflow:
7854         task->tk_status = -EOVERFLOW;
7855         goto out;
7856 }
7857
7858 static size_t max_response_pages(struct nfs_server *server)
7859 {
7860         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7861         return nfs_page_array_len(0, max_resp_sz);
7862 }
7863
7864 static void nfs4_free_pages(struct page **pages, size_t size)
7865 {
7866         int i;
7867
7868         if (!pages)
7869                 return;
7870
7871         for (i = 0; i < size; i++) {
7872                 if (!pages[i])
7873                         break;
7874                 __free_page(pages[i]);
7875         }
7876         kfree(pages);
7877 }
7878
7879 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7880 {
7881         struct page **pages;
7882         int i;
7883
7884         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7885         if (!pages) {
7886                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7887                 return NULL;
7888         }
7889
7890         for (i = 0; i < size; i++) {
7891                 pages[i] = alloc_page(gfp_flags);
7892                 if (!pages[i]) {
7893                         dprintk("%s: failed to allocate page\n", __func__);
7894                         nfs4_free_pages(pages, size);
7895                         return NULL;
7896                 }
7897         }
7898
7899         return pages;
7900 }
7901
7902 static void nfs4_layoutget_release(void *calldata)
7903 {
7904         struct nfs4_layoutget *lgp = calldata;
7905         struct inode *inode = lgp->args.inode;
7906         struct nfs_server *server = NFS_SERVER(inode);
7907         size_t max_pages = max_response_pages(server);
7908
7909         dprintk("--> %s\n", __func__);
7910         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7911         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7912         put_nfs_open_context(lgp->args.ctx);
7913         kfree(calldata);
7914         dprintk("<-- %s\n", __func__);
7915 }
7916
7917 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7918         .rpc_call_prepare = nfs4_layoutget_prepare,
7919         .rpc_call_done = nfs4_layoutget_done,
7920         .rpc_release = nfs4_layoutget_release,
7921 };
7922
7923 struct pnfs_layout_segment *
7924 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7925 {
7926         struct inode *inode = lgp->args.inode;
7927         struct nfs_server *server = NFS_SERVER(inode);
7928         size_t max_pages = max_response_pages(server);
7929         struct rpc_task *task;
7930         struct rpc_message msg = {
7931                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7932                 .rpc_argp = &lgp->args,
7933                 .rpc_resp = &lgp->res,
7934                 .rpc_cred = lgp->cred,
7935         };
7936         struct rpc_task_setup task_setup_data = {
7937                 .rpc_client = server->client,
7938                 .rpc_message = &msg,
7939                 .callback_ops = &nfs4_layoutget_call_ops,
7940                 .callback_data = lgp,
7941                 .flags = RPC_TASK_ASYNC,
7942         };
7943         struct pnfs_layout_segment *lseg = NULL;
7944         int status = 0;
7945
7946         dprintk("--> %s\n", __func__);
7947
7948         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7949         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7950
7951         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7952         if (!lgp->args.layout.pages) {
7953                 nfs4_layoutget_release(lgp);
7954                 return ERR_PTR(-ENOMEM);
7955         }
7956         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7957         lgp->args.timestamp = jiffies;
7958
7959         lgp->res.layoutp = &lgp->args.layout;
7960         lgp->res.seq_res.sr_slot = NULL;
7961         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7962
7963         task = rpc_run_task(&task_setup_data);
7964         if (IS_ERR(task))
7965                 return ERR_CAST(task);
7966         status = nfs4_wait_for_completion_rpc_task(task);
7967         if (status == 0)
7968                 status = task->tk_status;
7969         trace_nfs4_layoutget(lgp->args.ctx,
7970                         &lgp->args.range,
7971                         &lgp->res.range,
7972                         status);
7973         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7974         if (status == 0 && lgp->res.layoutp->len)
7975                 lseg = pnfs_layout_process(lgp);
7976         rpc_put_task(task);
7977         dprintk("<-- %s status=%d\n", __func__, status);
7978         if (status)
7979                 return ERR_PTR(status);
7980         return lseg;
7981 }
7982
7983 static void
7984 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7985 {
7986         struct nfs4_layoutreturn *lrp = calldata;
7987
7988         dprintk("--> %s\n", __func__);
7989         nfs41_setup_sequence(lrp->clp->cl_session,
7990                         &lrp->args.seq_args,
7991                         &lrp->res.seq_res,
7992                         task);
7993 }
7994
7995 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7996 {
7997         struct nfs4_layoutreturn *lrp = calldata;
7998         struct nfs_server *server;
7999
8000         dprintk("--> %s\n", __func__);
8001
8002         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
8003                 return;
8004
8005         server = NFS_SERVER(lrp->args.inode);
8006         switch (task->tk_status) {
8007         default:
8008                 task->tk_status = 0;
8009         case 0:
8010                 break;
8011         case -NFS4ERR_DELAY:
8012                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8013                         break;
8014                 rpc_restart_call_prepare(task);
8015                 return;
8016         }
8017         dprintk("<-- %s\n", __func__);
8018 }
8019
8020 static void nfs4_layoutreturn_release(void *calldata)
8021 {
8022         struct nfs4_layoutreturn *lrp = calldata;
8023         struct pnfs_layout_hdr *lo = lrp->args.layout;
8024         LIST_HEAD(freeme);
8025
8026         dprintk("--> %s\n", __func__);
8027         spin_lock(&lo->plh_inode->i_lock);
8028         if (lrp->res.lrs_present)
8029                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8030         pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range);
8031         pnfs_clear_layoutreturn_waitbit(lo);
8032         lo->plh_block_lgets--;
8033         spin_unlock(&lo->plh_inode->i_lock);
8034         pnfs_free_lseg_list(&freeme);
8035         pnfs_put_layout_hdr(lrp->args.layout);
8036         nfs_iput_and_deactive(lrp->inode);
8037         kfree(calldata);
8038         dprintk("<-- %s\n", __func__);
8039 }
8040
8041 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8042         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8043         .rpc_call_done = nfs4_layoutreturn_done,
8044         .rpc_release = nfs4_layoutreturn_release,
8045 };
8046
8047 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8048 {
8049         struct rpc_task *task;
8050         struct rpc_message msg = {
8051                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8052                 .rpc_argp = &lrp->args,
8053                 .rpc_resp = &lrp->res,
8054                 .rpc_cred = lrp->cred,
8055         };
8056         struct rpc_task_setup task_setup_data = {
8057                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8058                 .rpc_message = &msg,
8059                 .callback_ops = &nfs4_layoutreturn_call_ops,
8060                 .callback_data = lrp,
8061         };
8062         int status = 0;
8063
8064         dprintk("--> %s\n", __func__);
8065         if (!sync) {
8066                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8067                 if (!lrp->inode) {
8068                         nfs4_layoutreturn_release(lrp);
8069                         return -EAGAIN;
8070                 }
8071                 task_setup_data.flags |= RPC_TASK_ASYNC;
8072         }
8073         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8074         task = rpc_run_task(&task_setup_data);
8075         if (IS_ERR(task))
8076                 return PTR_ERR(task);
8077         if (sync)
8078                 status = task->tk_status;
8079         trace_nfs4_layoutreturn(lrp->args.inode, status);
8080         dprintk("<-- %s status=%d\n", __func__, status);
8081         rpc_put_task(task);
8082         return status;
8083 }
8084
8085 static int
8086 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8087                 struct pnfs_device *pdev,
8088                 struct rpc_cred *cred)
8089 {
8090         struct nfs4_getdeviceinfo_args args = {
8091                 .pdev = pdev,
8092                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8093                         NOTIFY_DEVICEID4_DELETE,
8094         };
8095         struct nfs4_getdeviceinfo_res res = {
8096                 .pdev = pdev,
8097         };
8098         struct rpc_message msg = {
8099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8100                 .rpc_argp = &args,
8101                 .rpc_resp = &res,
8102                 .rpc_cred = cred,
8103         };
8104         int status;
8105
8106         dprintk("--> %s\n", __func__);
8107         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8108         if (res.notification & ~args.notify_types)
8109                 dprintk("%s: unsupported notification\n", __func__);
8110         if (res.notification != args.notify_types)
8111                 pdev->nocache = 1;
8112
8113         dprintk("<-- %s status=%d\n", __func__, status);
8114
8115         return status;
8116 }
8117
8118 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8119                 struct pnfs_device *pdev,
8120                 struct rpc_cred *cred)
8121 {
8122         struct nfs4_exception exception = { };
8123         int err;
8124
8125         do {
8126                 err = nfs4_handle_exception(server,
8127                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8128                                         &exception);
8129         } while (exception.retry);
8130         return err;
8131 }
8132 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8133
8134 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8135 {
8136         struct nfs4_layoutcommit_data *data = calldata;
8137         struct nfs_server *server = NFS_SERVER(data->args.inode);
8138         struct nfs4_session *session = nfs4_get_session(server);
8139
8140         nfs41_setup_sequence(session,
8141                         &data->args.seq_args,
8142                         &data->res.seq_res,
8143                         task);
8144 }
8145
8146 static void
8147 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8148 {
8149         struct nfs4_layoutcommit_data *data = calldata;
8150         struct nfs_server *server = NFS_SERVER(data->args.inode);
8151
8152         if (!nfs41_sequence_done(task, &data->res.seq_res))
8153                 return;
8154
8155         switch (task->tk_status) { /* Just ignore these failures */
8156         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8157         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8158         case -NFS4ERR_BADLAYOUT:     /* no layout */
8159         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8160                 task->tk_status = 0;
8161         case 0:
8162                 break;
8163         default:
8164                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8165                         rpc_restart_call_prepare(task);
8166                         return;
8167                 }
8168         }
8169 }
8170
8171 static void nfs4_layoutcommit_release(void *calldata)
8172 {
8173         struct nfs4_layoutcommit_data *data = calldata;
8174
8175         pnfs_cleanup_layoutcommit(data);
8176         nfs_post_op_update_inode_force_wcc(data->args.inode,
8177                                            data->res.fattr);
8178         put_rpccred(data->cred);
8179         nfs_iput_and_deactive(data->inode);
8180         kfree(data);
8181 }
8182
8183 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8184         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8185         .rpc_call_done = nfs4_layoutcommit_done,
8186         .rpc_release = nfs4_layoutcommit_release,
8187 };
8188
8189 int
8190 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8191 {
8192         struct rpc_message msg = {
8193                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8194                 .rpc_argp = &data->args,
8195                 .rpc_resp = &data->res,
8196                 .rpc_cred = data->cred,
8197         };
8198         struct rpc_task_setup task_setup_data = {
8199                 .task = &data->task,
8200                 .rpc_client = NFS_CLIENT(data->args.inode),
8201                 .rpc_message = &msg,
8202                 .callback_ops = &nfs4_layoutcommit_ops,
8203                 .callback_data = data,
8204         };
8205         struct rpc_task *task;
8206         int status = 0;
8207
8208         dprintk("NFS: initiating layoutcommit call. sync %d "
8209                 "lbw: %llu inode %lu\n", sync,
8210                 data->args.lastbytewritten,
8211                 data->args.inode->i_ino);
8212
8213         if (!sync) {
8214                 data->inode = nfs_igrab_and_active(data->args.inode);
8215                 if (data->inode == NULL) {
8216                         nfs4_layoutcommit_release(data);
8217                         return -EAGAIN;
8218                 }
8219                 task_setup_data.flags = RPC_TASK_ASYNC;
8220         }
8221         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8222         task = rpc_run_task(&task_setup_data);
8223         if (IS_ERR(task))
8224                 return PTR_ERR(task);
8225         if (sync)
8226                 status = task->tk_status;
8227         trace_nfs4_layoutcommit(data->args.inode, status);
8228         dprintk("%s: status %d\n", __func__, status);
8229         rpc_put_task(task);
8230         return status;
8231 }
8232
8233 /**
8234  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8235  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8236  */
8237 static int
8238 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8239                     struct nfs_fsinfo *info,
8240                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8241 {
8242         struct nfs41_secinfo_no_name_args args = {
8243                 .style = SECINFO_STYLE_CURRENT_FH,
8244         };
8245         struct nfs4_secinfo_res res = {
8246                 .flavors = flavors,
8247         };
8248         struct rpc_message msg = {
8249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8250                 .rpc_argp = &args,
8251                 .rpc_resp = &res,
8252         };
8253         struct rpc_clnt *clnt = server->client;
8254         struct rpc_cred *cred = NULL;
8255         int status;
8256
8257         if (use_integrity) {
8258                 clnt = server->nfs_client->cl_rpcclient;
8259                 cred = nfs4_get_clid_cred(server->nfs_client);
8260                 msg.rpc_cred = cred;
8261         }
8262
8263         dprintk("--> %s\n", __func__);
8264         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8265                                 &res.seq_res, 0);
8266         dprintk("<-- %s status=%d\n", __func__, status);
8267
8268         if (cred)
8269                 put_rpccred(cred);
8270
8271         return status;
8272 }
8273
8274 static int
8275 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8276                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8277 {
8278         struct nfs4_exception exception = { };
8279         int err;
8280         do {
8281                 /* first try using integrity protection */
8282                 err = -NFS4ERR_WRONGSEC;
8283
8284                 /* try to use integrity protection with machine cred */
8285                 if (_nfs4_is_integrity_protected(server->nfs_client))
8286                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8287                                                           flavors, true);
8288
8289                 /*
8290                  * if unable to use integrity protection, or SECINFO with
8291                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8292                  * disallowed by spec, but exists in deployed servers) use
8293                  * the current filesystem's rpc_client and the user cred.
8294                  */
8295                 if (err == -NFS4ERR_WRONGSEC)
8296                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8297                                                           flavors, false);
8298
8299                 switch (err) {
8300                 case 0:
8301                 case -NFS4ERR_WRONGSEC:
8302                 case -ENOTSUPP:
8303                         goto out;
8304                 default:
8305                         err = nfs4_handle_exception(server, err, &exception);
8306                 }
8307         } while (exception.retry);
8308 out:
8309         return err;
8310 }
8311
8312 static int
8313 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8314                     struct nfs_fsinfo *info)
8315 {
8316         int err;
8317         struct page *page;
8318         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8319         struct nfs4_secinfo_flavors *flavors;
8320         struct nfs4_secinfo4 *secinfo;
8321         int i;
8322
8323         page = alloc_page(GFP_KERNEL);
8324         if (!page) {
8325                 err = -ENOMEM;
8326                 goto out;
8327         }
8328
8329         flavors = page_address(page);
8330         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8331
8332         /*
8333          * Fall back on "guess and check" method if
8334          * the server doesn't support SECINFO_NO_NAME
8335          */
8336         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8337                 err = nfs4_find_root_sec(server, fhandle, info);
8338                 goto out_freepage;
8339         }
8340         if (err)
8341                 goto out_freepage;
8342
8343         for (i = 0; i < flavors->num_flavors; i++) {
8344                 secinfo = &flavors->flavors[i];
8345
8346                 switch (secinfo->flavor) {
8347                 case RPC_AUTH_NULL:
8348                 case RPC_AUTH_UNIX:
8349                 case RPC_AUTH_GSS:
8350                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8351                                         &secinfo->flavor_info);
8352                         break;
8353                 default:
8354                         flavor = RPC_AUTH_MAXFLAVOR;
8355                         break;
8356                 }
8357
8358                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8359                         flavor = RPC_AUTH_MAXFLAVOR;
8360
8361                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8362                         err = nfs4_lookup_root_sec(server, fhandle,
8363                                                    info, flavor);
8364                         if (!err)
8365                                 break;
8366                 }
8367         }
8368
8369         if (flavor == RPC_AUTH_MAXFLAVOR)
8370                 err = -EPERM;
8371
8372 out_freepage:
8373         put_page(page);
8374         if (err == -EACCES)
8375                 return -EPERM;
8376 out:
8377         return err;
8378 }
8379
8380 static int _nfs41_test_stateid(struct nfs_server *server,
8381                 nfs4_stateid *stateid,
8382                 struct rpc_cred *cred)
8383 {
8384         int status;
8385         struct nfs41_test_stateid_args args = {
8386                 .stateid = stateid,
8387         };
8388         struct nfs41_test_stateid_res res;
8389         struct rpc_message msg = {
8390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8391                 .rpc_argp = &args,
8392                 .rpc_resp = &res,
8393                 .rpc_cred = cred,
8394         };
8395         struct rpc_clnt *rpc_client = server->client;
8396
8397         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8398                 &rpc_client, &msg);
8399
8400         dprintk("NFS call  test_stateid %p\n", stateid);
8401         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8402         nfs4_set_sequence_privileged(&args.seq_args);
8403         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8404                         &args.seq_args, &res.seq_res);
8405         if (status != NFS_OK) {
8406                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8407                 return status;
8408         }
8409         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8410         return -res.status;
8411 }
8412
8413 /**
8414  * nfs41_test_stateid - perform a TEST_STATEID operation
8415  *
8416  * @server: server / transport on which to perform the operation
8417  * @stateid: state ID to test
8418  * @cred: credential
8419  *
8420  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8421  * Otherwise a negative NFS4ERR value is returned if the operation
8422  * failed or the state ID is not currently valid.
8423  */
8424 static int nfs41_test_stateid(struct nfs_server *server,
8425                 nfs4_stateid *stateid,
8426                 struct rpc_cred *cred)
8427 {
8428         struct nfs4_exception exception = { };
8429         int err;
8430         do {
8431                 err = _nfs41_test_stateid(server, stateid, cred);
8432                 if (err != -NFS4ERR_DELAY)
8433                         break;
8434                 nfs4_handle_exception(server, err, &exception);
8435         } while (exception.retry);
8436         return err;
8437 }
8438
8439 struct nfs_free_stateid_data {
8440         struct nfs_server *server;
8441         struct nfs41_free_stateid_args args;
8442         struct nfs41_free_stateid_res res;
8443 };
8444
8445 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8446 {
8447         struct nfs_free_stateid_data *data = calldata;
8448         nfs41_setup_sequence(nfs4_get_session(data->server),
8449                         &data->args.seq_args,
8450                         &data->res.seq_res,
8451                         task);
8452 }
8453
8454 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8455 {
8456         struct nfs_free_stateid_data *data = calldata;
8457
8458         nfs41_sequence_done(task, &data->res.seq_res);
8459
8460         switch (task->tk_status) {
8461         case -NFS4ERR_DELAY:
8462                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8463                         rpc_restart_call_prepare(task);
8464         }
8465 }
8466
8467 static void nfs41_free_stateid_release(void *calldata)
8468 {
8469         kfree(calldata);
8470 }
8471
8472 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8473         .rpc_call_prepare = nfs41_free_stateid_prepare,
8474         .rpc_call_done = nfs41_free_stateid_done,
8475         .rpc_release = nfs41_free_stateid_release,
8476 };
8477
8478 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8479                 nfs4_stateid *stateid,
8480                 struct rpc_cred *cred,
8481                 bool privileged)
8482 {
8483         struct rpc_message msg = {
8484                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8485                 .rpc_cred = cred,
8486         };
8487         struct rpc_task_setup task_setup = {
8488                 .rpc_client = server->client,
8489                 .rpc_message = &msg,
8490                 .callback_ops = &nfs41_free_stateid_ops,
8491                 .flags = RPC_TASK_ASYNC,
8492         };
8493         struct nfs_free_stateid_data *data;
8494
8495         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8496                 &task_setup.rpc_client, &msg);
8497
8498         dprintk("NFS call  free_stateid %p\n", stateid);
8499         data = kmalloc(sizeof(*data), GFP_NOFS);
8500         if (!data)
8501                 return ERR_PTR(-ENOMEM);
8502         data->server = server;
8503         nfs4_stateid_copy(&data->args.stateid, stateid);
8504
8505         task_setup.callback_data = data;
8506
8507         msg.rpc_argp = &data->args;
8508         msg.rpc_resp = &data->res;
8509         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8510         if (privileged)
8511                 nfs4_set_sequence_privileged(&data->args.seq_args);
8512
8513         return rpc_run_task(&task_setup);
8514 }
8515
8516 /**
8517  * nfs41_free_stateid - perform a FREE_STATEID operation
8518  *
8519  * @server: server / transport on which to perform the operation
8520  * @stateid: state ID to release
8521  * @cred: credential
8522  *
8523  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8524  * negative NFS4ERR value is returned.
8525  */
8526 static int nfs41_free_stateid(struct nfs_server *server,
8527                 nfs4_stateid *stateid,
8528                 struct rpc_cred *cred)
8529 {
8530         struct rpc_task *task;
8531         int ret;
8532
8533         task = _nfs41_free_stateid(server, stateid, cred, true);
8534         if (IS_ERR(task))
8535                 return PTR_ERR(task);
8536         ret = rpc_wait_for_completion_task(task);
8537         if (!ret)
8538                 ret = task->tk_status;
8539         rpc_put_task(task);
8540         return ret;
8541 }
8542
8543 static void
8544 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8545 {
8546         struct rpc_task *task;
8547         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8548
8549         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8550         nfs4_free_lock_state(server, lsp);
8551         if (IS_ERR(task))
8552                 return;
8553         rpc_put_task(task);
8554 }
8555
8556 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8557                 const nfs4_stateid *s2)
8558 {
8559         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8560                 return false;
8561
8562         if (s1->seqid == s2->seqid)
8563                 return true;
8564         if (s1->seqid == 0 || s2->seqid == 0)
8565                 return true;
8566
8567         return false;
8568 }
8569
8570 #endif /* CONFIG_NFS_V4_1 */
8571
8572 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8573                 const nfs4_stateid *s2)
8574 {
8575         return nfs4_stateid_match(s1, s2);
8576 }
8577
8578
8579 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8580         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8581         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8582         .recover_open   = nfs4_open_reclaim,
8583         .recover_lock   = nfs4_lock_reclaim,
8584         .establish_clid = nfs4_init_clientid,
8585         .detect_trunking = nfs40_discover_server_trunking,
8586 };
8587
8588 #if defined(CONFIG_NFS_V4_1)
8589 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8590         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8591         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8592         .recover_open   = nfs4_open_reclaim,
8593         .recover_lock   = nfs4_lock_reclaim,
8594         .establish_clid = nfs41_init_clientid,
8595         .reclaim_complete = nfs41_proc_reclaim_complete,
8596         .detect_trunking = nfs41_discover_server_trunking,
8597 };
8598 #endif /* CONFIG_NFS_V4_1 */
8599
8600 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8601         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8602         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8603         .recover_open   = nfs40_open_expired,
8604         .recover_lock   = nfs4_lock_expired,
8605         .establish_clid = nfs4_init_clientid,
8606 };
8607
8608 #if defined(CONFIG_NFS_V4_1)
8609 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8610         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8611         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8612         .recover_open   = nfs41_open_expired,
8613         .recover_lock   = nfs41_lock_expired,
8614         .establish_clid = nfs41_init_clientid,
8615 };
8616 #endif /* CONFIG_NFS_V4_1 */
8617
8618 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8619         .sched_state_renewal = nfs4_proc_async_renew,
8620         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8621         .renew_lease = nfs4_proc_renew,
8622 };
8623
8624 #if defined(CONFIG_NFS_V4_1)
8625 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8626         .sched_state_renewal = nfs41_proc_async_sequence,
8627         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8628         .renew_lease = nfs4_proc_sequence,
8629 };
8630 #endif
8631
8632 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8633         .get_locations = _nfs40_proc_get_locations,
8634         .fsid_present = _nfs40_proc_fsid_present,
8635 };
8636
8637 #if defined(CONFIG_NFS_V4_1)
8638 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8639         .get_locations = _nfs41_proc_get_locations,
8640         .fsid_present = _nfs41_proc_fsid_present,
8641 };
8642 #endif  /* CONFIG_NFS_V4_1 */
8643
8644 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8645         .minor_version = 0,
8646         .init_caps = NFS_CAP_READDIRPLUS
8647                 | NFS_CAP_ATOMIC_OPEN
8648                 | NFS_CAP_POSIX_LOCK,
8649         .init_client = nfs40_init_client,
8650         .shutdown_client = nfs40_shutdown_client,
8651         .match_stateid = nfs4_match_stateid,
8652         .find_root_sec = nfs4_find_root_sec,
8653         .free_lock_state = nfs4_release_lockowner,
8654         .alloc_seqid = nfs_alloc_seqid,
8655         .call_sync_ops = &nfs40_call_sync_ops,
8656         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8657         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8658         .state_renewal_ops = &nfs40_state_renewal_ops,
8659         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8660 };
8661
8662 #if defined(CONFIG_NFS_V4_1)
8663 static struct nfs_seqid *
8664 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8665 {
8666         return NULL;
8667 }
8668
8669 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8670         .minor_version = 1,
8671         .init_caps = NFS_CAP_READDIRPLUS
8672                 | NFS_CAP_ATOMIC_OPEN
8673                 | NFS_CAP_POSIX_LOCK
8674                 | NFS_CAP_STATEID_NFSV41
8675                 | NFS_CAP_ATOMIC_OPEN_V1,
8676         .init_client = nfs41_init_client,
8677         .shutdown_client = nfs41_shutdown_client,
8678         .match_stateid = nfs41_match_stateid,
8679         .find_root_sec = nfs41_find_root_sec,
8680         .free_lock_state = nfs41_free_lock_state,
8681         .alloc_seqid = nfs_alloc_no_seqid,
8682         .call_sync_ops = &nfs41_call_sync_ops,
8683         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8684         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8685         .state_renewal_ops = &nfs41_state_renewal_ops,
8686         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8687 };
8688 #endif
8689
8690 #if defined(CONFIG_NFS_V4_2)
8691 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8692         .minor_version = 2,
8693         .init_caps = NFS_CAP_READDIRPLUS
8694                 | NFS_CAP_ATOMIC_OPEN
8695                 | NFS_CAP_POSIX_LOCK
8696                 | NFS_CAP_STATEID_NFSV41
8697                 | NFS_CAP_ATOMIC_OPEN_V1
8698                 | NFS_CAP_ALLOCATE
8699                 | NFS_CAP_DEALLOCATE
8700                 | NFS_CAP_SEEK
8701                 | NFS_CAP_LAYOUTSTATS,
8702         .init_client = nfs41_init_client,
8703         .shutdown_client = nfs41_shutdown_client,
8704         .match_stateid = nfs41_match_stateid,
8705         .find_root_sec = nfs41_find_root_sec,
8706         .free_lock_state = nfs41_free_lock_state,
8707         .call_sync_ops = &nfs41_call_sync_ops,
8708         .alloc_seqid = nfs_alloc_no_seqid,
8709         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8710         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8711         .state_renewal_ops = &nfs41_state_renewal_ops,
8712         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8713 };
8714 #endif
8715
8716 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8717         [0] = &nfs_v4_0_minor_ops,
8718 #if defined(CONFIG_NFS_V4_1)
8719         [1] = &nfs_v4_1_minor_ops,
8720 #endif
8721 #if defined(CONFIG_NFS_V4_2)
8722         [2] = &nfs_v4_2_minor_ops,
8723 #endif
8724 };
8725
8726 static const struct inode_operations nfs4_dir_inode_operations = {
8727         .create         = nfs_create,
8728         .lookup         = nfs_lookup,
8729         .atomic_open    = nfs_atomic_open,
8730         .link           = nfs_link,
8731         .unlink         = nfs_unlink,
8732         .symlink        = nfs_symlink,
8733         .mkdir          = nfs_mkdir,
8734         .rmdir          = nfs_rmdir,
8735         .mknod          = nfs_mknod,
8736         .rename         = nfs_rename,
8737         .permission     = nfs_permission,
8738         .getattr        = nfs_getattr,
8739         .setattr        = nfs_setattr,
8740         .getxattr       = generic_getxattr,
8741         .setxattr       = generic_setxattr,
8742         .listxattr      = generic_listxattr,
8743         .removexattr    = generic_removexattr,
8744 };
8745
8746 static const struct inode_operations nfs4_file_inode_operations = {
8747         .permission     = nfs_permission,
8748         .getattr        = nfs_getattr,
8749         .setattr        = nfs_setattr,
8750         .getxattr       = generic_getxattr,
8751         .setxattr       = generic_setxattr,
8752         .listxattr      = generic_listxattr,
8753         .removexattr    = generic_removexattr,
8754 };
8755
8756 const struct nfs_rpc_ops nfs_v4_clientops = {
8757         .version        = 4,                    /* protocol version */
8758         .dentry_ops     = &nfs4_dentry_operations,
8759         .dir_inode_ops  = &nfs4_dir_inode_operations,
8760         .file_inode_ops = &nfs4_file_inode_operations,
8761         .file_ops       = &nfs4_file_operations,
8762         .getroot        = nfs4_proc_get_root,
8763         .submount       = nfs4_submount,
8764         .try_mount      = nfs4_try_mount,
8765         .getattr        = nfs4_proc_getattr,
8766         .setattr        = nfs4_proc_setattr,
8767         .lookup         = nfs4_proc_lookup,
8768         .access         = nfs4_proc_access,
8769         .readlink       = nfs4_proc_readlink,
8770         .create         = nfs4_proc_create,
8771         .remove         = nfs4_proc_remove,
8772         .unlink_setup   = nfs4_proc_unlink_setup,
8773         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8774         .unlink_done    = nfs4_proc_unlink_done,
8775         .rename_setup   = nfs4_proc_rename_setup,
8776         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8777         .rename_done    = nfs4_proc_rename_done,
8778         .link           = nfs4_proc_link,
8779         .symlink        = nfs4_proc_symlink,
8780         .mkdir          = nfs4_proc_mkdir,
8781         .rmdir          = nfs4_proc_remove,
8782         .readdir        = nfs4_proc_readdir,
8783         .mknod          = nfs4_proc_mknod,
8784         .statfs         = nfs4_proc_statfs,
8785         .fsinfo         = nfs4_proc_fsinfo,
8786         .pathconf       = nfs4_proc_pathconf,
8787         .set_capabilities = nfs4_server_capabilities,
8788         .decode_dirent  = nfs4_decode_dirent,
8789         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8790         .read_setup     = nfs4_proc_read_setup,
8791         .read_done      = nfs4_read_done,
8792         .write_setup    = nfs4_proc_write_setup,
8793         .write_done     = nfs4_write_done,
8794         .commit_setup   = nfs4_proc_commit_setup,
8795         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8796         .commit_done    = nfs4_commit_done,
8797         .lock           = nfs4_proc_lock,
8798         .clear_acl_cache = nfs4_zap_acl_attr,
8799         .close_context  = nfs4_close_context,
8800         .open_context   = nfs4_atomic_open,
8801         .have_delegation = nfs4_have_delegation,
8802         .return_delegation = nfs4_inode_return_delegation,
8803         .alloc_client   = nfs4_alloc_client,
8804         .init_client    = nfs4_init_client,
8805         .free_client    = nfs4_free_client,
8806         .create_server  = nfs4_create_server,
8807         .clone_server   = nfs_clone_server,
8808 };
8809
8810 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8811         .prefix = XATTR_NAME_NFSV4_ACL,
8812         .list   = nfs4_xattr_list_nfs4_acl,
8813         .get    = nfs4_xattr_get_nfs4_acl,
8814         .set    = nfs4_xattr_set_nfs4_acl,
8815 };
8816
8817 const struct xattr_handler *nfs4_xattr_handlers[] = {
8818         &nfs4_xattr_nfs4_acl_handler,
8819 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8820         &nfs4_xattr_nfs4_label_handler,
8821 #endif
8822         NULL
8823 };
8824
8825 /*
8826  * Local variables:
8827  *  c-basic-offset: 8
8828  * End:
8829  */