fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.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 "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_FILE_OPEN:
 162                 return -EBUSY;
 163         default:
 164                 dprintk("%s could not handle NFSv4 error %d\n",
 165                                 __func__, -err);
 166                 break;
 167         }
 168         return -EIO;
 169 }
 170
 171 /*
 172  * This is our standard bitmap for GETATTR requests.
 173  */
 174 const u32 nfs4_fattr_bitmap[3] = {
 175         FATTR4_WORD0_TYPE
 176         | FATTR4_WORD0_CHANGE
 177         | FATTR4_WORD0_SIZE
 178         | FATTR4_WORD0_FSID
 179         | FATTR4_WORD0_FILEID,
 180         FATTR4_WORD1_MODE
 181         | FATTR4_WORD1_NUMLINKS
 182         | FATTR4_WORD1_OWNER
 183         | FATTR4_WORD1_OWNER_GROUP
 184         | FATTR4_WORD1_RAWDEV
 185         | FATTR4_WORD1_SPACE_USED
 186         | FATTR4_WORD1_TIME_ACCESS
 187         | FATTR4_WORD1_TIME_METADATA
 188         | FATTR4_WORD1_TIME_MODIFY,
 189 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 190         FATTR4_WORD2_SECURITY_LABEL
 191 #endif
 192 };
 193
 194 static const u32 nfs4_pnfs_open_bitmap[3] = {
 195         FATTR4_WORD0_TYPE
 196         | FATTR4_WORD0_CHANGE
 197         | FATTR4_WORD0_SIZE
 198         | FATTR4_WORD0_FSID
 199         | FATTR4_WORD0_FILEID,
 200         FATTR4_WORD1_MODE
 201         | FATTR4_WORD1_NUMLINKS
 202         | FATTR4_WORD1_OWNER
 203         | FATTR4_WORD1_OWNER_GROUP
 204         | FATTR4_WORD1_RAWDEV
 205         | FATTR4_WORD1_SPACE_USED
 206         | FATTR4_WORD1_TIME_ACCESS
 207         | FATTR4_WORD1_TIME_METADATA
 208         | FATTR4_WORD1_TIME_MODIFY,
 209         FATTR4_WORD2_MDSTHRESHOLD
 210 };
 211
 212 static const u32 nfs4_open_noattr_bitmap[3] = {
 213         FATTR4_WORD0_TYPE
 214         | FATTR4_WORD0_CHANGE
 215         | FATTR4_WORD0_FILEID,
 216 };
 217
 218 const u32 nfs4_statfs_bitmap[3] = {
 219         FATTR4_WORD0_FILES_AVAIL
 220         | FATTR4_WORD0_FILES_FREE
 221         | FATTR4_WORD0_FILES_TOTAL,
 222         FATTR4_WORD1_SPACE_AVAIL
 223         | FATTR4_WORD1_SPACE_FREE
 224         | FATTR4_WORD1_SPACE_TOTAL
 225 };
 226
 227 const u32 nfs4_pathconf_bitmap[3] = {
 228         FATTR4_WORD0_MAXLINK
 229         | FATTR4_WORD0_MAXNAME,
 230         0
 231 };
 232
 233 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 234                         | FATTR4_WORD0_MAXREAD
 235                         | FATTR4_WORD0_MAXWRITE
 236                         | FATTR4_WORD0_LEASE_TIME,
 237                         FATTR4_WORD1_TIME_DELTA
 238                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 239                         FATTR4_WORD2_LAYOUT_BLKSIZE
 240 };
 241
 242 const u32 nfs4_fs_locations_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_CHANGE
 245         | FATTR4_WORD0_SIZE
 246         | FATTR4_WORD0_FSID
 247         | FATTR4_WORD0_FILEID
 248         | FATTR4_WORD0_FS_LOCATIONS,
 249         FATTR4_WORD1_MODE
 250         | FATTR4_WORD1_NUMLINKS
 251         | FATTR4_WORD1_OWNER
 252         | FATTR4_WORD1_OWNER_GROUP
 253         | FATTR4_WORD1_RAWDEV
 254         | FATTR4_WORD1_SPACE_USED
 255         | FATTR4_WORD1_TIME_ACCESS
 256         | FATTR4_WORD1_TIME_METADATA
 257         | FATTR4_WORD1_TIME_MODIFY
 258         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 259 };
 260
 261 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 262                 struct nfs4_readdir_arg *readdir)
 263 {
 264         __be32 *start, *p;
 265
 266         if (cookie > 2) {
 267                 readdir->cookie = cookie;
 268                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 269                 return;
 270         }
 271
 272         readdir->cookie = 0;
 273         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 274         if (cookie == 2)
 275                 return;
 276
 277         /*
 278          * NFSv4 servers do not return entries for '.' and '..'
 279          * Therefore, we fake these entries here.  We let '.'
 280          * have cookie 0 and '..' have cookie 1.  Note that
 281          * when talking to the server, we always send cookie 0
 282          * instead of 1 or 2.
 283          */
 284         start = p = kmap_atomic(*readdir->pages);
 285
 286         if (cookie == 0) {
 287                 *p++ = xdr_one;                                  /* next */
 288                 *p++ = xdr_zero;                   /* cookie, first word */
 289                 *p++ = xdr_one;                   /* cookie, second word */
 290                 *p++ = xdr_one;                             /* entry len */
 291                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 292                 p++;
 293                 *p++ = xdr_one;                         /* bitmap length */
 294                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 295                 *p++ = htonl(8);              /* attribute buffer length */
 296                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 297         }
 298
 299         *p++ = xdr_one;                                  /* next */
 300         *p++ = xdr_zero;                   /* cookie, first word */
 301         *p++ = xdr_two;                   /* cookie, second word */
 302         *p++ = xdr_two;                             /* entry len */
 303         memcpy(p, "..\0\0", 4);                         /* entry */
 304         p++;
 305         *p++ = xdr_one;                         /* bitmap length */
 306         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 307         *p++ = htonl(8);              /* attribute buffer length */
 308         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 309
 310         readdir->pgbase = (char *)p - (char *)start;
 311         readdir->count -= readdir->pgbase;
 312         kunmap_atomic(start);
 313 }
 314
 315 static long nfs4_update_delay(long *timeout)
 316 {
 317         long ret;
 318         if (!timeout)
 319                 return NFS4_POLL_RETRY_MAX;
 320         if (*timeout <= 0)
 321                 *timeout = NFS4_POLL_RETRY_MIN;
 322         if (*timeout > NFS4_POLL_RETRY_MAX)
 323                 *timeout = NFS4_POLL_RETRY_MAX;
 324         ret = *timeout;
 325         *timeout <<= 1;
 326         return ret;
 327 }
 328
 329 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 330 {
 331         int res = 0;
 332
 333         might_sleep();
 334
 335         freezable_schedule_timeout_killable_unsafe(
 336                 nfs4_update_delay(timeout));
 337         if (fatal_signal_pending(current))
 338                 res = -ERESTARTSYS;
 339         return res;
 340 }
 341
 342 /* This is the error handling routine for processes that are allowed
 343  * to sleep.
 344  */
 345 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 346 {
 347         struct nfs_client *clp = server->nfs_client;
 348         struct nfs4_state *state = exception->state;
 349         struct inode *inode = exception->inode;
 350         int ret = errorcode;
 351
 352         exception->retry = 0;
 353         switch(errorcode) {
 354                 case 0:
 355                         return 0;
 356                 case -NFS4ERR_OPENMODE:
 357                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 358                                 nfs4_inode_return_delegation(inode);
 359                                 exception->retry = 1;
 360                                 return 0;
 361                         }
 362                         if (state == NULL)
 363                                 break;
 364                         ret = nfs4_schedule_stateid_recovery(server, state);
 365                         if (ret < 0)
 366                                 break;
 367                         goto wait_on_recovery;
 368                 case -NFS4ERR_DELEG_REVOKED:
 369                 case -NFS4ERR_ADMIN_REVOKED:
 370                 case -NFS4ERR_BAD_STATEID:
 371                         if (state == NULL)
 372                                 break;
 373                         ret = nfs4_schedule_stateid_recovery(server, state);
 374                         if (ret < 0)
 375                                 break;
 376                         goto wait_on_recovery;
 377                 case -NFS4ERR_EXPIRED:
 378                         if (state != NULL) {
 379                                 ret = nfs4_schedule_stateid_recovery(server, state);
 380                                 if (ret < 0)
 381                                         break;
 382                         }
 383                 case -NFS4ERR_STALE_STATEID:
 384                 case -NFS4ERR_STALE_CLIENTID:
 385                         nfs4_schedule_lease_recovery(clp);
 386                         goto wait_on_recovery;
 387                 case -NFS4ERR_MOVED:
 388                         ret = nfs4_schedule_migration_recovery(server);
 389                         if (ret < 0)
 390                                 break;
 391                         goto wait_on_recovery;
 392                 case -NFS4ERR_LEASE_MOVED:
 393                         nfs4_schedule_lease_moved_recovery(clp);
 394                         goto wait_on_recovery;
 395 #if defined(CONFIG_NFS_V4_1)
 396                 case -NFS4ERR_BADSESSION:
 397                 case -NFS4ERR_BADSLOT:
 398                 case -NFS4ERR_BAD_HIGH_SLOT:
 399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 400                 case -NFS4ERR_DEADSESSION:
 401                 case -NFS4ERR_SEQ_FALSE_RETRY:
 402                 case -NFS4ERR_SEQ_MISORDERED:
 403                         dprintk("%s ERROR: %d Reset session\n", __func__,
 404                                 errorcode);
 405                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 406                         goto wait_on_recovery;
 407 #endif /* defined(CONFIG_NFS_V4_1) */
 408                 case -NFS4ERR_FILE_OPEN:
 409                         if (exception->timeout > HZ) {
 410                                 /* We have retried a decent amount, time to
 411                                  * fail
 412                                  */
 413                                 ret = -EBUSY;
 414                                 break;
 415                         }
 416                 case -NFS4ERR_GRACE:
 417                 case -NFS4ERR_DELAY:
 418                         ret = nfs4_delay(server->client, &exception->timeout);
 419                         if (ret != 0)
 420                                 break;
 421                 case -NFS4ERR_RETRY_UNCACHED_REP:
 422                 case -NFS4ERR_OLD_STATEID:
 423                         exception->retry = 1;
 424                         break;
 425                 case -NFS4ERR_BADOWNER:
 426                         /* The following works around a Linux server bug! */
 427                 case -NFS4ERR_BADNAME:
 428                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 429                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 430                                 exception->retry = 1;
 431                                 printk(KERN_WARNING "NFS: v4 server %s "
 432                                                 "does not accept raw "
 433                                                 "uid/gids. "
 434                                                 "Reenabling the idmapper.\n",
 435                                                 server->nfs_client->cl_hostname);
 436                         }
 437         }
 438         /* We failed to handle the error */
 439         return nfs4_map_errors(ret);
 440 wait_on_recovery:
 441         ret = nfs4_wait_clnt_recover(clp);
 442         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 443                 return -EIO;
 444         if (ret == 0)
 445                 exception->retry = 1;
 446         return ret;
 447 }
 448
 449 /*
 450  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 451  * or 'false' otherwise.
 452  */
 453 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 454 {
 455         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 456
 457         if (flavor == RPC_AUTH_GSS_KRB5I ||
 458             flavor == RPC_AUTH_GSS_KRB5P)
 459                 return true;
 460
 461         return false;
 462 }
 463
 464 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 465 {
 466         spin_lock(&clp->cl_lock);
 467         if (time_before(clp->cl_last_renewal,timestamp))
 468                 clp->cl_last_renewal = timestamp;
 469         spin_unlock(&clp->cl_lock);
 470 }
 471
 472 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 473 {
 474         do_renew_lease(server->nfs_client, timestamp);
 475 }
 476
 477 struct nfs4_call_sync_data {
 478         const struct nfs_server *seq_server;
 479         struct nfs4_sequence_args *seq_args;
 480         struct nfs4_sequence_res *seq_res;
 481 };
 482
 483 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 484                                struct nfs4_sequence_res *res, int cache_reply)
 485 {
 486         args->sa_slot = NULL;
 487         args->sa_cache_this = cache_reply;
 488         args->sa_privileged = 0;
 489
 490         res->sr_slot = NULL;
 491 }
 492
 493 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 494 {
 495         args->sa_privileged = 1;
 496 }
 497
 498 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 499                          struct nfs4_sequence_args *args,
 500                          struct nfs4_sequence_res *res,
 501                          struct rpc_task *task)
 502 {
 503         struct nfs4_slot *slot;
 504
 505         /* slot already allocated? */
 506         if (res->sr_slot != NULL)
 507                 goto out_start;
 508
 509         spin_lock(&tbl->slot_tbl_lock);
 510         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 511                 goto out_sleep;
 512
 513         slot = nfs4_alloc_slot(tbl);
 514         if (IS_ERR(slot)) {
 515                 if (slot == ERR_PTR(-ENOMEM))
 516                         task->tk_timeout = HZ >> 2;
 517                 goto out_sleep;
 518         }
 519         spin_unlock(&tbl->slot_tbl_lock);
 520
 521         args->sa_slot = slot;
 522         res->sr_slot = slot;
 523
 524 out_start:
 525         rpc_call_start(task);
 526         return 0;
 527
 528 out_sleep:
 529         if (args->sa_privileged)
 530                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 531                                 NULL, RPC_PRIORITY_PRIVILEGED);
 532         else
 533                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 534         spin_unlock(&tbl->slot_tbl_lock);
 535         return -EAGAIN;
 536 }
 537 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 538
 539 static int nfs40_sequence_done(struct rpc_task *task,
 540                                struct nfs4_sequence_res *res)
 541 {
 542         struct nfs4_slot *slot = res->sr_slot;
 543         struct nfs4_slot_table *tbl;
 544
 545         if (slot == NULL)
 546                 goto out;
 547
 548         tbl = slot->table;
 549         spin_lock(&tbl->slot_tbl_lock);
 550         if (!nfs41_wake_and_assign_slot(tbl, slot))
 551                 nfs4_free_slot(tbl, slot);
 552         spin_unlock(&tbl->slot_tbl_lock);
 553
 554         res->sr_slot = NULL;
 555 out:
 556         return 1;
 557 }
 558
 559 #if defined(CONFIG_NFS_V4_1)
 560
 561 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 562 {
 563         struct nfs4_session *session;
 564         struct nfs4_slot_table *tbl;
 565         struct nfs4_slot *slot = res->sr_slot;
 566         bool send_new_highest_used_slotid = false;
 567
 568         tbl = slot->table;
 569         session = tbl->session;
 570
 571         spin_lock(&tbl->slot_tbl_lock);
 572         /* Be nice to the server: try to ensure that the last transmitted
 573          * value for highest_user_slotid <= target_highest_slotid
 574          */
 575         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 576                 send_new_highest_used_slotid = true;
 577
 578         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 579                 send_new_highest_used_slotid = false;
 580                 goto out_unlock;
 581         }
 582         nfs4_free_slot(tbl, slot);
 583
 584         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 585                 send_new_highest_used_slotid = false;
 586 out_unlock:
 587         spin_unlock(&tbl->slot_tbl_lock);
 588         res->sr_slot = NULL;
 589         if (send_new_highest_used_slotid)
 590                 nfs41_server_notify_highest_slotid_update(session->clp);
 591 }
 592
 593 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 594 {
 595         struct nfs4_session *session;
 596         struct nfs4_slot *slot = res->sr_slot;
 597         struct nfs_client *clp;
 598         bool interrupted = false;
 599         int ret = 1;
 600
 601         if (slot == NULL)
 602                 goto out_noaction;
 603         /* don't increment the sequence number if the task wasn't sent */
 604         if (!RPC_WAS_SENT(task))
 605                 goto out;
 606
 607         session = slot->table->session;
 608
 609         if (slot->interrupted) {
 610                 slot->interrupted = 0;
 611                 interrupted = true;
 612         }
 613
 614         trace_nfs4_sequence_done(session, res);
 615         /* Check the SEQUENCE operation status */
 616         switch (res->sr_status) {
 617         case 0:
 618                 /* Update the slot's sequence and clientid lease timer */
 619                 ++slot->seq_nr;
 620                 clp = session->clp;
 621                 do_renew_lease(clp, res->sr_timestamp);
 622                 /* Check sequence flags */
 623                 if (res->sr_status_flags != 0)
 624                         nfs4_schedule_lease_recovery(clp);
 625                 nfs41_update_target_slotid(slot->table, slot, res);
 626                 break;
 627         case 1:
 628                 /*
 629                  * sr_status remains 1 if an RPC level error occurred.
 630                  * The server may or may not have processed the sequence
 631                  * operation..
 632                  * Mark the slot as having hosted an interrupted RPC call.
 633                  */
 634                 slot->interrupted = 1;
 635                 goto out;
 636         case -NFS4ERR_DELAY:
 637                 /* The server detected a resend of the RPC call and
 638                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 639                  * of RFC5661.
 640                  */
 641                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 642                         __func__,
 643                         slot->slot_nr,
 644                         slot->seq_nr);
 645                 goto out_retry;
 646         case -NFS4ERR_BADSLOT:
 647                 /*
 648                  * The slot id we used was probably retired. Try again
 649                  * using a different slot id.
 650                  */
 651                 goto retry_nowait;
 652         case -NFS4ERR_SEQ_MISORDERED:
 653                 /*
 654                  * Was the last operation on this sequence interrupted?
 655                  * If so, retry after bumping the sequence number.
 656                  */
 657                 if (interrupted) {
 658                         ++slot->seq_nr;
 659                         goto retry_nowait;
 660                 }
 661                 /*
 662                  * Could this slot have been previously retired?
 663                  * If so, then the server may be expecting seq_nr = 1!
 664                  */
 665                 if (slot->seq_nr != 1) {
 666                         slot->seq_nr = 1;
 667                         goto retry_nowait;
 668                 }
 669                 break;
 670         case -NFS4ERR_SEQ_FALSE_RETRY:
 671                 ++slot->seq_nr;
 672                 goto retry_nowait;
 673         default:
 674                 /* Just update the slot sequence no. */
 675                 ++slot->seq_nr;
 676         }
 677 out:
 678         /* The session may be reset by one of the error handlers. */
 679         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 680         nfs41_sequence_free_slot(res);
 681 out_noaction:
 682         return ret;
 683 retry_nowait:
 684         if (rpc_restart_call_prepare(task)) {
 685                 task->tk_status = 0;
 686                 ret = 0;
 687         }
 688         goto out;
 689 out_retry:
 690         if (!rpc_restart_call(task))
 691                 goto out;
 692         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 693         return 0;
 694 }
 695 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 696
 697 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 698 {
 699         if (res->sr_slot == NULL)
 700                 return 1;
 701         if (!res->sr_slot->table->session)
 702                 return nfs40_sequence_done(task, res);
 703         return nfs41_sequence_done(task, res);
 704 }
 705 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 706
 707 int nfs41_setup_sequence(struct nfs4_session *session,
 708                                 struct nfs4_sequence_args *args,
 709                                 struct nfs4_sequence_res *res,
 710                                 struct rpc_task *task)
 711 {
 712         struct nfs4_slot *slot;
 713         struct nfs4_slot_table *tbl;
 714
 715         dprintk("--> %s\n", __func__);
 716         /* slot already allocated? */
 717         if (res->sr_slot != NULL)
 718                 goto out_success;
 719
 720         tbl = &session->fc_slot_table;
 721
 722         task->tk_timeout = 0;
 723
 724         spin_lock(&tbl->slot_tbl_lock);
 725         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 726             !args->sa_privileged) {
 727                 /* The state manager will wait until the slot table is empty */
 728                 dprintk("%s session is draining\n", __func__);
 729                 goto out_sleep;
 730         }
 731
 732         slot = nfs4_alloc_slot(tbl);
 733         if (IS_ERR(slot)) {
 734                 /* If out of memory, try again in 1/4 second */
 735                 if (slot == ERR_PTR(-ENOMEM))
 736                         task->tk_timeout = HZ >> 2;
 737                 dprintk("<-- %s: no free slots\n", __func__);
 738                 goto out_sleep;
 739         }
 740         spin_unlock(&tbl->slot_tbl_lock);
 741
 742         args->sa_slot = slot;
 743
 744         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 745                         slot->slot_nr, slot->seq_nr);
 746
 747         res->sr_slot = slot;
 748         res->sr_timestamp = jiffies;
 749         res->sr_status_flags = 0;
 750         /*
 751          * sr_status is only set in decode_sequence, and so will remain
 752          * set to 1 if an rpc level failure occurs.
 753          */
 754         res->sr_status = 1;
 755         trace_nfs4_setup_sequence(session, args);
 756 out_success:
 757         rpc_call_start(task);
 758         return 0;
 759 out_sleep:
 760         /* Privileged tasks are queued with top priority */
 761         if (args->sa_privileged)
 762                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 763                                 NULL, RPC_PRIORITY_PRIVILEGED);
 764         else
 765                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 766         spin_unlock(&tbl->slot_tbl_lock);
 767         return -EAGAIN;
 768 }
 769 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 770
 771 static int nfs4_setup_sequence(const struct nfs_server *server,
 772                                struct nfs4_sequence_args *args,
 773                                struct nfs4_sequence_res *res,
 774                                struct rpc_task *task)
 775 {
 776         struct nfs4_session *session = nfs4_get_session(server);
 777         int ret = 0;
 778
 779         if (!session)
 780                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 781                                             args, res, task);
 782
 783         dprintk("--> %s clp %p session %p sr_slot %u\n",
 784                 __func__, session->clp, session, res->sr_slot ?
 785                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 786
 787         ret = nfs41_setup_sequence(session, args, res, task);
 788
 789         dprintk("<-- %s status=%d\n", __func__, ret);
 790         return ret;
 791 }
 792
 793 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 794 {
 795         struct nfs4_call_sync_data *data = calldata;
 796         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 797
 798         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 799
 800         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 801 }
 802
 803 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 804 {
 805         struct nfs4_call_sync_data *data = calldata;
 806
 807         nfs41_sequence_done(task, data->seq_res);
 808 }
 809
 810 static const struct rpc_call_ops nfs41_call_sync_ops = {
 811         .rpc_call_prepare = nfs41_call_sync_prepare,
 812         .rpc_call_done = nfs41_call_sync_done,
 813 };
 814
 815 #else   /* !CONFIG_NFS_V4_1 */
 816
 817 static int nfs4_setup_sequence(const struct nfs_server *server,
 818                                struct nfs4_sequence_args *args,
 819                                struct nfs4_sequence_res *res,
 820                                struct rpc_task *task)
 821 {
 822         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 823                                     args, res, task);
 824 }
 825
 826 int nfs4_sequence_done(struct rpc_task *task,
 827                        struct nfs4_sequence_res *res)
 828 {
 829         return nfs40_sequence_done(task, res);
 830 }
 831 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 832
 833 #endif  /* !CONFIG_NFS_V4_1 */
 834
 835 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 836 {
 837         struct nfs4_call_sync_data *data = calldata;
 838         nfs4_setup_sequence(data->seq_server,
 839                                 data->seq_args, data->seq_res, task);
 840 }
 841
 842 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 843 {
 844         struct nfs4_call_sync_data *data = calldata;
 845         nfs4_sequence_done(task, data->seq_res);
 846 }
 847
 848 static const struct rpc_call_ops nfs40_call_sync_ops = {
 849         .rpc_call_prepare = nfs40_call_sync_prepare,
 850         .rpc_call_done = nfs40_call_sync_done,
 851 };
 852
 853 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 854                                    struct nfs_server *server,
 855                                    struct rpc_message *msg,
 856                                    struct nfs4_sequence_args *args,
 857                                    struct nfs4_sequence_res *res)
 858 {
 859         int ret;
 860         struct rpc_task *task;
 861         struct nfs_client *clp = server->nfs_client;
 862         struct nfs4_call_sync_data data = {
 863                 .seq_server = server,
 864                 .seq_args = args,
 865                 .seq_res = res,
 866         };
 867         struct rpc_task_setup task_setup = {
 868                 .rpc_client = clnt,
 869                 .rpc_message = msg,
 870                 .callback_ops = clp->cl_mvops->call_sync_ops,
 871                 .callback_data = &data
 872         };
 873
 874         task = rpc_run_task(&task_setup);
 875         if (IS_ERR(task))
 876                 ret = PTR_ERR(task);
 877         else {
 878                 ret = task->tk_status;
 879                 rpc_put_task(task);
 880         }
 881         return ret;
 882 }
 883
 884 int nfs4_call_sync(struct rpc_clnt *clnt,
 885                    struct nfs_server *server,
 886                    struct rpc_message *msg,
 887                    struct nfs4_sequence_args *args,
 888                    struct nfs4_sequence_res *res,
 889                    int cache_reply)
 890 {
 891         nfs4_init_sequence(args, res, cache_reply);
 892         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 893 }
 894
 895 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 896 {
 897         struct nfs_inode *nfsi = NFS_I(dir);
 898
 899         spin_lock(&dir->i_lock);
 900         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 901         if (!cinfo->atomic || cinfo->before != dir->i_version)
 902                 nfs_force_lookup_revalidate(dir);
 903         dir->i_version = cinfo->after;
 904         nfs_fscache_invalidate(dir);
 905         spin_unlock(&dir->i_lock);
 906 }
 907
 908 struct nfs4_opendata {
 909         struct kref kref;
 910         struct nfs_openargs o_arg;
 911         struct nfs_openres o_res;
 912         struct nfs_open_confirmargs c_arg;
 913         struct nfs_open_confirmres c_res;
 914         struct nfs4_string owner_name;
 915         struct nfs4_string group_name;
 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 = parent->d_inode;
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         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1020         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1021         if (IS_ERR(p->o_arg.seqid))
1022                 goto err_free_label;
1023         nfs_sb_active(dentry->d_sb);
1024         p->dentry = dget(dentry);
1025         p->dir = parent;
1026         p->owner = sp;
1027         atomic_inc(&sp->so_count);
1028         p->o_arg.open_flags = flags;
1029         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1030         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1031                         fmode, flags);
1032         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1033          * will return permission denied for all bits until close */
1034         if (!(flags & O_EXCL)) {
1035                 /* ask server to check for all possible rights as results
1036                  * are cached */
1037                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1038                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1039         }
1040         p->o_arg.clientid = server->nfs_client->cl_clientid;
1041         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1042         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1043         p->o_arg.name = &dentry->d_name;
1044         p->o_arg.server = server;
1045         p->o_arg.bitmask = nfs4_bitmask(server, label);
1046         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1047         p->o_arg.label = label;
1048         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1049         switch (p->o_arg.claim) {
1050         case NFS4_OPEN_CLAIM_NULL:
1051         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1052         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1053                 p->o_arg.fh = NFS_FH(dir);
1054                 break;
1055         case NFS4_OPEN_CLAIM_PREVIOUS:
1056         case NFS4_OPEN_CLAIM_FH:
1057         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1058         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1059                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1060         }
1061         if (attrs != NULL && attrs->ia_valid != 0) {
1062                 __u32 verf[2];
1063
1064                 p->o_arg.u.attrs = &p->attrs;
1065                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1066
1067                 verf[0] = jiffies;
1068                 verf[1] = current->pid;
1069                 memcpy(p->o_arg.u.verifier.data, verf,
1070                                 sizeof(p->o_arg.u.verifier.data));
1071         }
1072         p->c_arg.fh = &p->o_res.fh;
1073         p->c_arg.stateid = &p->o_res.stateid;
1074         p->c_arg.seqid = p->o_arg.seqid;
1075         nfs4_init_opendata_res(p);
1076         kref_init(&p->kref);
1077         return p;
1078
1079 err_free_label:
1080         nfs4_label_free(p->f_label);
1081 err_free_p:
1082         kfree(p);
1083 err:
1084         dput(parent);
1085         return NULL;
1086 }
1087
1088 static void nfs4_opendata_free(struct kref *kref)
1089 {
1090         struct nfs4_opendata *p = container_of(kref,
1091                         struct nfs4_opendata, kref);
1092         struct super_block *sb = p->dentry->d_sb;
1093
1094         nfs_free_seqid(p->o_arg.seqid);
1095         if (p->state != NULL)
1096                 nfs4_put_open_state(p->state);
1097         nfs4_put_state_owner(p->owner);
1098
1099         nfs4_label_free(p->f_label);
1100
1101         dput(p->dir);
1102         dput(p->dentry);
1103         nfs_sb_deactive(sb);
1104         nfs_fattr_free_names(&p->f_attr);
1105         kfree(p->f_attr.mdsthreshold);
1106         kfree(p);
1107 }
1108
1109 static void nfs4_opendata_put(struct nfs4_opendata *p)
1110 {
1111         if (p != NULL)
1112                 kref_put(&p->kref, nfs4_opendata_free);
1113 }
1114
1115 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1116 {
1117         int ret;
1118
1119         ret = rpc_wait_for_completion_task(task);
1120         return ret;
1121 }
1122
1123 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1124 {
1125         int ret = 0;
1126
1127         if (open_mode & (O_EXCL|O_TRUNC))
1128                 goto out;
1129         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1130                 case FMODE_READ:
1131                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1132                                 && state->n_rdonly != 0;
1133                         break;
1134                 case FMODE_WRITE:
1135                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1136                                 && state->n_wronly != 0;
1137                         break;
1138                 case FMODE_READ|FMODE_WRITE:
1139                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1140                                 && state->n_rdwr != 0;
1141         }
1142 out:
1143         return ret;
1144 }
1145
1146 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1147 {
1148         if (delegation == NULL)
1149                 return 0;
1150         if ((delegation->type & fmode) != fmode)
1151                 return 0;
1152         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1153                 return 0;
1154         nfs_mark_delegation_referenced(delegation);
1155         return 1;
1156 }
1157
1158 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1159 {
1160         switch (fmode) {
1161                 case FMODE_WRITE:
1162                         state->n_wronly++;
1163                         break;
1164                 case FMODE_READ:
1165                         state->n_rdonly++;
1166                         break;
1167                 case FMODE_READ|FMODE_WRITE:
1168                         state->n_rdwr++;
1169         }
1170         nfs4_state_set_mode_locked(state, state->state | fmode);
1171 }
1172
1173 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1174 {
1175         struct nfs_client *clp = state->owner->so_server->nfs_client;
1176         bool need_recover = false;
1177
1178         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1179                 need_recover = true;
1180         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1181                 need_recover = true;
1182         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1183                 need_recover = true;
1184         if (need_recover)
1185                 nfs4_state_mark_reclaim_nograce(clp, state);
1186 }
1187
1188 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1189                 nfs4_stateid *stateid)
1190 {
1191         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1192                 return true;
1193         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1194                 nfs_test_and_clear_all_open_stateid(state);
1195                 return true;
1196         }
1197         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1198                 return true;
1199         return false;
1200 }
1201
1202 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1203 {
1204         if (state->n_wronly)
1205                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1206         if (state->n_rdonly)
1207                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1208         if (state->n_rdwr)
1209                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1210 }
1211
1212 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1213                 nfs4_stateid *stateid, fmode_t fmode)
1214 {
1215         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1216         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1217         case FMODE_WRITE:
1218                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1219                 break;
1220         case FMODE_READ:
1221                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1222                 break;
1223         case 0:
1224                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1225                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226                 clear_bit(NFS_OPEN_STATE, &state->flags);
1227         }
1228         if (stateid == NULL)
1229                 return;
1230         /* Handle races with OPEN */
1231         if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1232             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1233                 nfs_resync_open_stateid_locked(state);
1234                 return;
1235         }
1236         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1237                 nfs4_stateid_copy(&state->stateid, stateid);
1238         nfs4_stateid_copy(&state->open_stateid, stateid);
1239 }
1240
1241 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1242 {
1243         write_seqlock(&state->seqlock);
1244         nfs_clear_open_stateid_locked(state, stateid, fmode);
1245         write_sequnlock(&state->seqlock);
1246         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1247                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1248 }
1249
1250 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1251 {
1252         switch (fmode) {
1253                 case FMODE_READ:
1254                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1255                         break;
1256                 case FMODE_WRITE:
1257                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1258                         break;
1259                 case FMODE_READ|FMODE_WRITE:
1260                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1261         }
1262         if (!nfs_need_update_open_stateid(state, stateid))
1263                 return;
1264         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1265                 nfs4_stateid_copy(&state->stateid, stateid);
1266         nfs4_stateid_copy(&state->open_stateid, stateid);
1267 }
1268
1269 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1270 {
1271         /*
1272          * Protect the call to nfs4_state_set_mode_locked and
1273          * serialise the stateid update
1274          */
1275         write_seqlock(&state->seqlock);
1276         if (deleg_stateid != NULL) {
1277                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1278                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1279         }
1280         if (open_stateid != NULL)
1281                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1282         write_sequnlock(&state->seqlock);
1283         spin_lock(&state->owner->so_lock);
1284         update_open_stateflags(state, fmode);
1285         spin_unlock(&state->owner->so_lock);
1286 }
1287
1288 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1289 {
1290         struct nfs_inode *nfsi = NFS_I(state->inode);
1291         struct nfs_delegation *deleg_cur;
1292         int ret = 0;
1293
1294         fmode &= (FMODE_READ|FMODE_WRITE);
1295
1296         rcu_read_lock();
1297         deleg_cur = rcu_dereference(nfsi->delegation);
1298         if (deleg_cur == NULL)
1299                 goto no_delegation;
1300
1301         spin_lock(&deleg_cur->lock);
1302         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1303            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1304             (deleg_cur->type & fmode) != fmode)
1305                 goto no_delegation_unlock;
1306
1307         if (delegation == NULL)
1308                 delegation = &deleg_cur->stateid;
1309         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1310                 goto no_delegation_unlock;
1311
1312         nfs_mark_delegation_referenced(deleg_cur);
1313         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1314         ret = 1;
1315 no_delegation_unlock:
1316         spin_unlock(&deleg_cur->lock);
1317 no_delegation:
1318         rcu_read_unlock();
1319
1320         if (!ret && open_stateid != NULL) {
1321                 __update_open_stateid(state, open_stateid, NULL, fmode);
1322                 ret = 1;
1323         }
1324         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1325                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1326
1327         return ret;
1328 }
1329
1330 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1331                 const nfs4_stateid *stateid)
1332 {
1333         struct nfs4_state *state = lsp->ls_state;
1334         bool ret = false;
1335
1336         spin_lock(&state->state_lock);
1337         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1338                 goto out_noupdate;
1339         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1340                 goto out_noupdate;
1341         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1342         ret = true;
1343 out_noupdate:
1344         spin_unlock(&state->state_lock);
1345         return ret;
1346 }
1347
1348 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1349 {
1350         struct nfs_delegation *delegation;
1351
1352         rcu_read_lock();
1353         delegation = rcu_dereference(NFS_I(inode)->delegation);
1354         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1355                 rcu_read_unlock();
1356                 return;
1357         }
1358         rcu_read_unlock();
1359         nfs4_inode_return_delegation(inode);
1360 }
1361
1362 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1363 {
1364         struct nfs4_state *state = opendata->state;
1365         struct nfs_inode *nfsi = NFS_I(state->inode);
1366         struct nfs_delegation *delegation;
1367         int open_mode = opendata->o_arg.open_flags;
1368         fmode_t fmode = opendata->o_arg.fmode;
1369         nfs4_stateid stateid;
1370         int ret = -EAGAIN;
1371
1372         for (;;) {
1373                 spin_lock(&state->owner->so_lock);
1374                 if (can_open_cached(state, fmode, open_mode)) {
1375                         update_open_stateflags(state, fmode);
1376                         spin_unlock(&state->owner->so_lock);
1377                         goto out_return_state;
1378                 }
1379                 spin_unlock(&state->owner->so_lock);
1380                 rcu_read_lock();
1381                 delegation = rcu_dereference(nfsi->delegation);
1382                 if (!can_open_delegated(delegation, fmode)) {
1383                         rcu_read_unlock();
1384                         break;
1385                 }
1386                 /* Save the delegation */
1387                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1388                 rcu_read_unlock();
1389                 nfs_release_seqid(opendata->o_arg.seqid);
1390                 if (!opendata->is_recover) {
1391                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1392                         if (ret != 0)
1393                                 goto out;
1394                 }
1395                 ret = -EAGAIN;
1396
1397                 /* Try to update the stateid using the delegation */
1398                 if (update_open_stateid(state, NULL, &stateid, fmode))
1399                         goto out_return_state;
1400         }
1401 out:
1402         return ERR_PTR(ret);
1403 out_return_state:
1404         atomic_inc(&state->count);
1405         return state;
1406 }
1407
1408 static void
1409 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1410 {
1411         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1412         struct nfs_delegation *delegation;
1413         int delegation_flags = 0;
1414
1415         rcu_read_lock();
1416         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1417         if (delegation)
1418                 delegation_flags = delegation->flags;
1419         rcu_read_unlock();
1420         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1421                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1422                                    "returning a delegation for "
1423                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1424                                    clp->cl_hostname);
1425         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1426                 nfs_inode_set_delegation(state->inode,
1427                                          data->owner->so_cred,
1428                                          &data->o_res);
1429         else
1430                 nfs_inode_reclaim_delegation(state->inode,
1431                                              data->owner->so_cred,
1432                                              &data->o_res);
1433 }
1434
1435 /*
1436  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1437  * and update the nfs4_state.
1438  */
1439 static struct nfs4_state *
1440 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1441 {
1442         struct inode *inode = data->state->inode;
1443         struct nfs4_state *state = data->state;
1444         int ret;
1445
1446         if (!data->rpc_done) {
1447                 if (data->rpc_status) {
1448                         ret = data->rpc_status;
1449                         goto err;
1450                 }
1451                 /* cached opens have already been processed */
1452                 goto update;
1453         }
1454
1455         ret = nfs_refresh_inode(inode, &data->f_attr);
1456         if (ret)
1457                 goto err;
1458
1459         if (data->o_res.delegation_type != 0)
1460                 nfs4_opendata_check_deleg(data, state);
1461 update:
1462         update_open_stateid(state, &data->o_res.stateid, NULL,
1463                             data->o_arg.fmode);
1464         atomic_inc(&state->count);
1465
1466         return state;
1467 err:
1468         return ERR_PTR(ret);
1469
1470 }
1471
1472 static struct nfs4_state *
1473 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1474 {
1475         struct inode *inode;
1476         struct nfs4_state *state = NULL;
1477         int ret;
1478
1479         if (!data->rpc_done) {
1480                 state = nfs4_try_open_cached(data);
1481                 goto out;
1482         }
1483
1484         ret = -EAGAIN;
1485         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1486                 goto err;
1487         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1488         ret = PTR_ERR(inode);
1489         if (IS_ERR(inode))
1490                 goto err;
1491         ret = -ENOMEM;
1492         state = nfs4_get_open_state(inode, data->owner);
1493         if (state == NULL)
1494                 goto err_put_inode;
1495         if (data->o_res.delegation_type != 0)
1496                 nfs4_opendata_check_deleg(data, state);
1497         update_open_stateid(state, &data->o_res.stateid, NULL,
1498                         data->o_arg.fmode);
1499         iput(inode);
1500 out:
1501         nfs_release_seqid(data->o_arg.seqid);
1502         return state;
1503 err_put_inode:
1504         iput(inode);
1505 err:
1506         return ERR_PTR(ret);
1507 }
1508
1509 static struct nfs4_state *
1510 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1511 {
1512         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1513                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1514         return _nfs4_opendata_to_nfs4_state(data);
1515 }
1516
1517 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1518 {
1519         struct nfs_inode *nfsi = NFS_I(state->inode);
1520         struct nfs_open_context *ctx;
1521
1522         spin_lock(&state->inode->i_lock);
1523         list_for_each_entry(ctx, &nfsi->open_files, list) {
1524                 if (ctx->state != state)
1525                         continue;
1526                 get_nfs_open_context(ctx);
1527                 spin_unlock(&state->inode->i_lock);
1528                 return ctx;
1529         }
1530         spin_unlock(&state->inode->i_lock);
1531         return ERR_PTR(-ENOENT);
1532 }
1533
1534 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1535                 struct nfs4_state *state, enum open_claim_type4 claim)
1536 {
1537         struct nfs4_opendata *opendata;
1538
1539         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1540                         NULL, NULL, claim, GFP_NOFS);
1541         if (opendata == NULL)
1542                 return ERR_PTR(-ENOMEM);
1543         opendata->state = state;
1544         atomic_inc(&state->count);
1545         return opendata;
1546 }
1547
1548 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1549 {
1550         struct nfs4_state *newstate;
1551         int ret;
1552
1553         opendata->o_arg.open_flags = 0;
1554         opendata->o_arg.fmode = fmode;
1555         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1556         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1557         nfs4_init_opendata_res(opendata);
1558         ret = _nfs4_recover_proc_open(opendata);
1559         if (ret != 0)
1560                 return ret;
1561         newstate = nfs4_opendata_to_nfs4_state(opendata);
1562         if (IS_ERR(newstate))
1563                 return PTR_ERR(newstate);
1564         nfs4_close_state(newstate, fmode);
1565         *res = newstate;
1566         return 0;
1567 }
1568
1569 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1570 {
1571         struct nfs4_state *newstate;
1572         int ret;
1573
1574         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1575         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1576         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1577         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1578         /* memory barrier prior to reading state->n_* */
1579         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1580         clear_bit(NFS_OPEN_STATE, &state->flags);
1581         smp_rmb();
1582         if (state->n_rdwr != 0) {
1583                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1584                 if (ret != 0)
1585                         return ret;
1586                 if (newstate != state)
1587                         return -ESTALE;
1588         }
1589         if (state->n_wronly != 0) {
1590                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1591                 if (ret != 0)
1592                         return ret;
1593                 if (newstate != state)
1594                         return -ESTALE;
1595         }
1596         if (state->n_rdonly != 0) {
1597                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1598                 if (ret != 0)
1599                         return ret;
1600                 if (newstate != state)
1601                         return -ESTALE;
1602         }
1603         /*
1604          * We may have performed cached opens for all three recoveries.
1605          * Check if we need to update the current stateid.
1606          */
1607         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1608             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1609                 write_seqlock(&state->seqlock);
1610                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1611                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1612                 write_sequnlock(&state->seqlock);
1613         }
1614         return 0;
1615 }
1616
1617 /*
1618  * OPEN_RECLAIM:
1619  *      reclaim state on the server after a reboot.
1620  */
1621 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1622 {
1623         struct nfs_delegation *delegation;
1624         struct nfs4_opendata *opendata;
1625         fmode_t delegation_type = 0;
1626         int status;
1627
1628         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1629                         NFS4_OPEN_CLAIM_PREVIOUS);
1630         if (IS_ERR(opendata))
1631                 return PTR_ERR(opendata);
1632         rcu_read_lock();
1633         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1634         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1635                 delegation_type = delegation->type;
1636         rcu_read_unlock();
1637         opendata->o_arg.u.delegation_type = delegation_type;
1638         status = nfs4_open_recover(opendata, state);
1639         nfs4_opendata_put(opendata);
1640         return status;
1641 }
1642
1643 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1644 {
1645         struct nfs_server *server = NFS_SERVER(state->inode);
1646         struct nfs4_exception exception = { };
1647         int err;
1648         do {
1649                 err = _nfs4_do_open_reclaim(ctx, state);
1650                 trace_nfs4_open_reclaim(ctx, 0, err);
1651                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1652                         continue;
1653                 if (err != -NFS4ERR_DELAY)
1654                         break;
1655                 nfs4_handle_exception(server, err, &exception);
1656         } while (exception.retry);
1657         return err;
1658 }
1659
1660 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1661 {
1662         struct nfs_open_context *ctx;
1663         int ret;
1664
1665         ctx = nfs4_state_find_open_context(state);
1666         if (IS_ERR(ctx))
1667                 return -EAGAIN;
1668         ret = nfs4_do_open_reclaim(ctx, state);
1669         put_nfs_open_context(ctx);
1670         return ret;
1671 }
1672
1673 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1674 {
1675         switch (err) {
1676                 default:
1677                         printk(KERN_ERR "NFS: %s: unhandled error "
1678                                         "%d.\n", __func__, err);
1679                 case 0:
1680                 case -ENOENT:
1681                 case -ESTALE:
1682                         break;
1683                 case -NFS4ERR_BADSESSION:
1684                 case -NFS4ERR_BADSLOT:
1685                 case -NFS4ERR_BAD_HIGH_SLOT:
1686                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1687                 case -NFS4ERR_DEADSESSION:
1688                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1689                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1690                         return -EAGAIN;
1691                 case -NFS4ERR_STALE_CLIENTID:
1692                 case -NFS4ERR_STALE_STATEID:
1693                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1694                 case -NFS4ERR_EXPIRED:
1695                         /* Don't recall a delegation if it was lost */
1696                         nfs4_schedule_lease_recovery(server->nfs_client);
1697                         return -EAGAIN;
1698                 case -NFS4ERR_MOVED:
1699                         nfs4_schedule_migration_recovery(server);
1700                         return -EAGAIN;
1701                 case -NFS4ERR_LEASE_MOVED:
1702                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1703                         return -EAGAIN;
1704                 case -NFS4ERR_DELEG_REVOKED:
1705                 case -NFS4ERR_ADMIN_REVOKED:
1706                 case -NFS4ERR_BAD_STATEID:
1707                 case -NFS4ERR_OPENMODE:
1708                         nfs_inode_find_state_and_recover(state->inode,
1709                                         stateid);
1710                         nfs4_schedule_stateid_recovery(server, state);
1711                         return -EAGAIN;
1712                 case -NFS4ERR_DELAY:
1713                 case -NFS4ERR_GRACE:
1714                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1715                         ssleep(1);
1716                         return -EAGAIN;
1717                 case -ENOMEM:
1718                 case -NFS4ERR_DENIED:
1719                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1720                         return 0;
1721         }
1722         return err;
1723 }
1724
1725 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1726 {
1727         struct nfs_server *server = NFS_SERVER(state->inode);
1728         struct nfs4_opendata *opendata;
1729         int err;
1730
1731         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1732                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1733         if (IS_ERR(opendata))
1734                 return PTR_ERR(opendata);
1735         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1736         err = nfs4_open_recover(opendata, state);
1737         nfs4_opendata_put(opendata);
1738         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1739 }
1740
1741 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1742 {
1743         struct nfs4_opendata *data = calldata;
1744
1745         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1746                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1747 }
1748
1749 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1750 {
1751         struct nfs4_opendata *data = calldata;
1752
1753         nfs40_sequence_done(task, &data->c_res.seq_res);
1754
1755         data->rpc_status = task->tk_status;
1756         if (data->rpc_status == 0) {
1757                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1758                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1759                 renew_lease(data->o_res.server, data->timestamp);
1760                 data->rpc_done = 1;
1761         }
1762 }
1763
1764 static void nfs4_open_confirm_release(void *calldata)
1765 {
1766         struct nfs4_opendata *data = calldata;
1767         struct nfs4_state *state = NULL;
1768
1769         /* If this request hasn't been cancelled, do nothing */
1770         if (data->cancelled == 0)
1771                 goto out_free;
1772         /* In case of error, no cleanup! */
1773         if (!data->rpc_done)
1774                 goto out_free;
1775         state = nfs4_opendata_to_nfs4_state(data);
1776         if (!IS_ERR(state))
1777                 nfs4_close_state(state, data->o_arg.fmode);
1778 out_free:
1779         nfs4_opendata_put(data);
1780 }
1781
1782 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1783         .rpc_call_prepare = nfs4_open_confirm_prepare,
1784         .rpc_call_done = nfs4_open_confirm_done,
1785         .rpc_release = nfs4_open_confirm_release,
1786 };
1787
1788 /*
1789  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1790  */
1791 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1792 {
1793         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1794         struct rpc_task *task;
1795         struct  rpc_message msg = {
1796                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1797                 .rpc_argp = &data->c_arg,
1798                 .rpc_resp = &data->c_res,
1799                 .rpc_cred = data->owner->so_cred,
1800         };
1801         struct rpc_task_setup task_setup_data = {
1802                 .rpc_client = server->client,
1803                 .rpc_message = &msg,
1804                 .callback_ops = &nfs4_open_confirm_ops,
1805                 .callback_data = data,
1806                 .workqueue = nfsiod_workqueue,
1807                 .flags = RPC_TASK_ASYNC,
1808         };
1809         int status;
1810
1811         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1812         kref_get(&data->kref);
1813         data->rpc_done = 0;
1814         data->rpc_status = 0;
1815         data->timestamp = jiffies;
1816         task = rpc_run_task(&task_setup_data);
1817         if (IS_ERR(task))
1818                 return PTR_ERR(task);
1819         status = nfs4_wait_for_completion_rpc_task(task);
1820         if (status != 0) {
1821                 data->cancelled = 1;
1822                 smp_wmb();
1823         } else
1824                 status = data->rpc_status;
1825         rpc_put_task(task);
1826         return status;
1827 }
1828
1829 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1830 {
1831         struct nfs4_opendata *data = calldata;
1832         struct nfs4_state_owner *sp = data->owner;
1833         struct nfs_client *clp = sp->so_server->nfs_client;
1834
1835         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1836                 goto out_wait;
1837         /*
1838          * Check if we still need to send an OPEN call, or if we can use
1839          * a delegation instead.
1840          */
1841         if (data->state != NULL) {
1842                 struct nfs_delegation *delegation;
1843
1844                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1845                         goto out_no_action;
1846                 rcu_read_lock();
1847                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1848                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1849                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1850                     can_open_delegated(delegation, data->o_arg.fmode))
1851                         goto unlock_no_action;
1852                 rcu_read_unlock();
1853         }
1854         /* Update client id. */
1855         data->o_arg.clientid = clp->cl_clientid;
1856         switch (data->o_arg.claim) {
1857         case NFS4_OPEN_CLAIM_PREVIOUS:
1858         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1859         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1860                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1861         case NFS4_OPEN_CLAIM_FH:
1862                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1863                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1864         }
1865         data->timestamp = jiffies;
1866         if (nfs4_setup_sequence(data->o_arg.server,
1867                                 &data->o_arg.seq_args,
1868                                 &data->o_res.seq_res,
1869                                 task) != 0)
1870                 nfs_release_seqid(data->o_arg.seqid);
1871
1872         /* Set the create mode (note dependency on the session type) */
1873         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1874         if (data->o_arg.open_flags & O_EXCL) {
1875                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1876                 if (nfs4_has_persistent_session(clp))
1877                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1878                 else if (clp->cl_mvops->minor_version > 0)
1879                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1880         }
1881         return;
1882 unlock_no_action:
1883         rcu_read_unlock();
1884 out_no_action:
1885         task->tk_action = NULL;
1886 out_wait:
1887         nfs4_sequence_done(task, &data->o_res.seq_res);
1888 }
1889
1890 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1891 {
1892         struct nfs4_opendata *data = calldata;
1893
1894         data->rpc_status = task->tk_status;
1895
1896         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1897                 return;
1898
1899         if (task->tk_status == 0) {
1900                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1901                         switch (data->o_res.f_attr->mode & S_IFMT) {
1902                         case S_IFREG:
1903                                 break;
1904                         case S_IFLNK:
1905                                 data->rpc_status = -ELOOP;
1906                                 break;
1907                         case S_IFDIR:
1908                                 data->rpc_status = -EISDIR;
1909                                 break;
1910                         default:
1911                                 data->rpc_status = -ENOTDIR;
1912                         }
1913                 }
1914                 renew_lease(data->o_res.server, data->timestamp);
1915                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1916                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1917         }
1918         data->rpc_done = 1;
1919 }
1920
1921 static void nfs4_open_release(void *calldata)
1922 {
1923         struct nfs4_opendata *data = calldata;
1924         struct nfs4_state *state = NULL;
1925
1926         /* If this request hasn't been cancelled, do nothing */
1927         if (data->cancelled == 0)
1928                 goto out_free;
1929         /* In case of error, no cleanup! */
1930         if (data->rpc_status != 0 || !data->rpc_done)
1931                 goto out_free;
1932         /* In case we need an open_confirm, no cleanup! */
1933         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1934                 goto out_free;
1935         state = nfs4_opendata_to_nfs4_state(data);
1936         if (!IS_ERR(state))
1937                 nfs4_close_state(state, data->o_arg.fmode);
1938 out_free:
1939         nfs4_opendata_put(data);
1940 }
1941
1942 static const struct rpc_call_ops nfs4_open_ops = {
1943         .rpc_call_prepare = nfs4_open_prepare,
1944         .rpc_call_done = nfs4_open_done,
1945         .rpc_release = nfs4_open_release,
1946 };
1947
1948 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1949 {
1950         struct inode *dir = data->dir->d_inode;
1951         struct nfs_server *server = NFS_SERVER(dir);
1952         struct nfs_openargs *o_arg = &data->o_arg;
1953         struct nfs_openres *o_res = &data->o_res;
1954         struct rpc_task *task;
1955         struct rpc_message msg = {
1956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1957                 .rpc_argp = o_arg,
1958                 .rpc_resp = o_res,
1959                 .rpc_cred = data->owner->so_cred,
1960         };
1961         struct rpc_task_setup task_setup_data = {
1962                 .rpc_client = server->client,
1963                 .rpc_message = &msg,
1964                 .callback_ops = &nfs4_open_ops,
1965                 .callback_data = data,
1966                 .workqueue = nfsiod_workqueue,
1967                 .flags = RPC_TASK_ASYNC,
1968         };
1969         int status;
1970
1971         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1972         kref_get(&data->kref);
1973         data->rpc_done = 0;
1974         data->rpc_status = 0;
1975         data->cancelled = 0;
1976         data->is_recover = 0;
1977         if (isrecover) {
1978                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1979                 data->is_recover = 1;
1980         }
1981         task = rpc_run_task(&task_setup_data);
1982         if (IS_ERR(task))
1983                 return PTR_ERR(task);
1984         status = nfs4_wait_for_completion_rpc_task(task);
1985         if (status != 0) {
1986                 data->cancelled = 1;
1987                 smp_wmb();
1988         } else
1989                 status = data->rpc_status;
1990         rpc_put_task(task);
1991
1992         return status;
1993 }
1994
1995 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1996 {
1997         struct inode *dir = data->dir->d_inode;
1998         struct nfs_openres *o_res = &data->o_res;
1999         int status;
2000
2001         status = nfs4_run_open_task(data, 1);
2002         if (status != 0 || !data->rpc_done)
2003                 return status;
2004
2005         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2006
2007         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2008                 status = _nfs4_proc_open_confirm(data);
2009                 if (status != 0)
2010                         return status;
2011         }
2012
2013         return status;
2014 }
2015
2016 /*
2017  * Additional permission checks in order to distinguish between an
2018  * open for read, and an open for execute. This works around the
2019  * fact that NFSv4 OPEN treats read and execute permissions as being
2020  * the same.
2021  * Note that in the non-execute case, we want to turn off permission
2022  * checking if we just created a new file (POSIX open() semantics).
2023  */
2024 static int nfs4_opendata_access(struct rpc_cred *cred,
2025                                 struct nfs4_opendata *opendata,
2026                                 struct nfs4_state *state, fmode_t fmode,
2027                                 int openflags)
2028 {
2029         struct nfs_access_entry cache;
2030         u32 mask;
2031
2032         /* access call failed or for some reason the server doesn't
2033          * support any access modes -- defer access call until later */
2034         if (opendata->o_res.access_supported == 0)
2035                 return 0;
2036
2037         mask = 0;
2038         /*
2039          * Use openflags to check for exec, because fmode won't
2040          * always have FMODE_EXEC set when file open for exec.
2041          */
2042         if (openflags & __FMODE_EXEC) {
2043                 /* ONLY check for exec rights */
2044                 mask = MAY_EXEC;
2045         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2046                 mask = MAY_READ;
2047
2048         cache.cred = cred;
2049         cache.jiffies = jiffies;
2050         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2051         nfs_access_add_cache(state->inode, &cache);
2052
2053         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2054                 return 0;
2055
2056         /* even though OPEN succeeded, access is denied. Close the file */
2057         nfs4_close_state(state, fmode);
2058         return -EACCES;
2059 }
2060
2061 /*
2062  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2063  */
2064 static int _nfs4_proc_open(struct nfs4_opendata *data)
2065 {
2066         struct inode *dir = data->dir->d_inode;
2067         struct nfs_server *server = NFS_SERVER(dir);
2068         struct nfs_openargs *o_arg = &data->o_arg;
2069         struct nfs_openres *o_res = &data->o_res;
2070         int status;
2071
2072         status = nfs4_run_open_task(data, 0);
2073         if (!data->rpc_done)
2074                 return status;
2075         if (status != 0) {
2076                 if (status == -NFS4ERR_BADNAME &&
2077                                 !(o_arg->open_flags & O_CREAT))
2078                         return -ENOENT;
2079                 return status;
2080         }
2081
2082         nfs_fattr_map_and_free_names(server, &data->f_attr);
2083
2084         if (o_arg->open_flags & O_CREAT) {
2085                 update_changeattr(dir, &o_res->cinfo);
2086                 if (o_arg->open_flags & O_EXCL)
2087                         data->file_created = 1;
2088                 else if (o_res->cinfo.before != o_res->cinfo.after)
2089                         data->file_created = 1;
2090         }
2091         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2092                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2093         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2094                 status = _nfs4_proc_open_confirm(data);
2095                 if (status != 0)
2096                         return status;
2097         }
2098         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2099                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2100         return 0;
2101 }
2102
2103 static int nfs4_recover_expired_lease(struct nfs_server *server)
2104 {
2105         return nfs4_client_recover_expired_lease(server->nfs_client);
2106 }
2107
2108 /*
2109  * OPEN_EXPIRED:
2110  *      reclaim state on the server after a network partition.
2111  *      Assumes caller holds the appropriate lock
2112  */
2113 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2114 {
2115         struct nfs4_opendata *opendata;
2116         int ret;
2117
2118         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2119                         NFS4_OPEN_CLAIM_FH);
2120         if (IS_ERR(opendata))
2121                 return PTR_ERR(opendata);
2122         ret = nfs4_open_recover(opendata, state);
2123         if (ret == -ESTALE)
2124                 d_drop(ctx->dentry);
2125         nfs4_opendata_put(opendata);
2126         return ret;
2127 }
2128
2129 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2130 {
2131         struct nfs_server *server = NFS_SERVER(state->inode);
2132         struct nfs4_exception exception = { };
2133         int err;
2134
2135         do {
2136                 err = _nfs4_open_expired(ctx, state);
2137                 trace_nfs4_open_expired(ctx, 0, err);
2138                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2139                         continue;
2140                 switch (err) {
2141                 default:
2142                         goto out;
2143                 case -NFS4ERR_GRACE:
2144                 case -NFS4ERR_DELAY:
2145                         nfs4_handle_exception(server, err, &exception);
2146                         err = 0;
2147                 }
2148         } while (exception.retry);
2149 out:
2150         return err;
2151 }
2152
2153 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2154 {
2155         struct nfs_open_context *ctx;
2156         int ret;
2157
2158         ctx = nfs4_state_find_open_context(state);
2159         if (IS_ERR(ctx))
2160                 return -EAGAIN;
2161         ret = nfs4_do_open_expired(ctx, state);
2162         put_nfs_open_context(ctx);
2163         return ret;
2164 }
2165
2166 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2167 {
2168         nfs_remove_bad_delegation(state->inode);
2169         write_seqlock(&state->seqlock);
2170         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2171         write_sequnlock(&state->seqlock);
2172         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2173 }
2174
2175 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2176 {
2177         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2178                 nfs_finish_clear_delegation_stateid(state);
2179 }
2180
2181 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2182 {
2183         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2184         nfs40_clear_delegation_stateid(state);
2185         return nfs4_open_expired(sp, state);
2186 }
2187
2188 #if defined(CONFIG_NFS_V4_1)
2189 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2190 {
2191         struct nfs_server *server = NFS_SERVER(state->inode);
2192         nfs4_stateid stateid;
2193         struct nfs_delegation *delegation;
2194         struct rpc_cred *cred;
2195         int status;
2196
2197         /* Get the delegation credential for use by test/free_stateid */
2198         rcu_read_lock();
2199         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2200         if (delegation == NULL) {
2201                 rcu_read_unlock();
2202                 return;
2203         }
2204
2205         nfs4_stateid_copy(&stateid, &delegation->stateid);
2206         cred = get_rpccred(delegation->cred);
2207         rcu_read_unlock();
2208         status = nfs41_test_stateid(server, &stateid, cred);
2209         trace_nfs4_test_delegation_stateid(state, NULL, status);
2210
2211         if (status != NFS_OK) {
2212                 /* Free the stateid unless the server explicitly
2213                  * informs us the stateid is unrecognized. */
2214                 if (status != -NFS4ERR_BAD_STATEID)
2215                         nfs41_free_stateid(server, &stateid, cred);
2216                 nfs_finish_clear_delegation_stateid(state);
2217         }
2218
2219         put_rpccred(cred);
2220 }
2221
2222 /**
2223  * nfs41_check_open_stateid - possibly free an open stateid
2224  *
2225  * @state: NFSv4 state for an inode
2226  *
2227  * Returns NFS_OK if recovery for this stateid is now finished.
2228  * Otherwise a negative NFS4ERR value is returned.
2229  */
2230 static int nfs41_check_open_stateid(struct nfs4_state *state)
2231 {
2232         struct nfs_server *server = NFS_SERVER(state->inode);
2233         nfs4_stateid *stateid = &state->open_stateid;
2234         struct rpc_cred *cred = state->owner->so_cred;
2235         int status;
2236
2237         /* If a state reset has been done, test_stateid is unneeded */
2238         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2239             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2240             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2241                 return -NFS4ERR_BAD_STATEID;
2242
2243         status = nfs41_test_stateid(server, stateid, cred);
2244         trace_nfs4_test_open_stateid(state, NULL, status);
2245         if (status != NFS_OK) {
2246                 /* Free the stateid unless the server explicitly
2247                  * informs us the stateid is unrecognized. */
2248                 if (status != -NFS4ERR_BAD_STATEID)
2249                         nfs41_free_stateid(server, stateid, cred);
2250
2251                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2252                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2253                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2254                 clear_bit(NFS_OPEN_STATE, &state->flags);
2255         }
2256         return status;
2257 }
2258
2259 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2260 {
2261         int status;
2262
2263         nfs41_check_delegation_stateid(state);
2264         status = nfs41_check_open_stateid(state);
2265         if (status != NFS_OK)
2266                 status = nfs4_open_expired(sp, state);
2267         return status;
2268 }
2269 #endif
2270
2271 /*
2272  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2273  * fields corresponding to attributes that were used to store the verifier.
2274  * Make sure we clobber those fields in the later setattr call
2275  */
2276 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2277 {
2278         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2279             !(sattr->ia_valid & ATTR_ATIME_SET))
2280                 sattr->ia_valid |= ATTR_ATIME;
2281
2282         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2283             !(sattr->ia_valid & ATTR_MTIME_SET))
2284                 sattr->ia_valid |= ATTR_MTIME;
2285 }
2286
2287 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2288                 fmode_t fmode,
2289                 int flags,
2290                 struct nfs_open_context *ctx)
2291 {
2292         struct nfs4_state_owner *sp = opendata->owner;
2293         struct nfs_server *server = sp->so_server;
2294         struct dentry *dentry;
2295         struct nfs4_state *state;
2296         unsigned int seq;
2297         int ret;
2298
2299         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2300
2301         ret = _nfs4_proc_open(opendata);
2302         if (ret != 0)
2303                 goto out;
2304
2305         state = nfs4_opendata_to_nfs4_state(opendata);
2306         ret = PTR_ERR(state);
2307         if (IS_ERR(state))
2308                 goto out;
2309         if (server->caps & NFS_CAP_POSIX_LOCK)
2310                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2311
2312         dentry = opendata->dentry;
2313         if (dentry->d_inode == NULL) {
2314                 /* FIXME: Is this d_drop() ever needed? */
2315                 d_drop(dentry);
2316                 dentry = d_add_unique(dentry, igrab(state->inode));
2317                 if (dentry == NULL) {
2318                         dentry = opendata->dentry;
2319                 } else if (dentry != ctx->dentry) {
2320                         dput(ctx->dentry);
2321                         ctx->dentry = dget(dentry);
2322                 }
2323                 nfs_set_verifier(dentry,
2324                                 nfs_save_change_attribute(opendata->dir->d_inode));
2325         }
2326
2327         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2328         if (ret != 0)
2329                 goto out;
2330
2331         ctx->state = state;
2332         if (dentry->d_inode == state->inode) {
2333                 nfs_inode_attach_open_context(ctx);
2334                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2335                         nfs4_schedule_stateid_recovery(server, state);
2336         }
2337 out:
2338         return ret;
2339 }
2340
2341 /*
2342  * Returns a referenced nfs4_state
2343  */
2344 static int _nfs4_do_open(struct inode *dir,
2345                         struct nfs_open_context *ctx,
2346                         int flags,
2347                         struct iattr *sattr,
2348                         struct nfs4_label *label,
2349                         int *opened)
2350 {
2351         struct nfs4_state_owner  *sp;
2352         struct nfs4_state     *state = NULL;
2353         struct nfs_server       *server = NFS_SERVER(dir);
2354         struct nfs4_opendata *opendata;
2355         struct dentry *dentry = ctx->dentry;
2356         struct rpc_cred *cred = ctx->cred;
2357         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2358         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2359         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2360         struct nfs4_label *olabel = NULL;
2361         int status;
2362
2363         /* Protect against reboot recovery conflicts */
2364         status = -ENOMEM;
2365         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2366         if (sp == NULL) {
2367                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2368                 goto out_err;
2369         }
2370         status = nfs4_recover_expired_lease(server);
2371         if (status != 0)
2372                 goto err_put_state_owner;
2373         if (dentry->d_inode != NULL)
2374                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2375         status = -ENOMEM;
2376         if (dentry->d_inode)
2377                 claim = NFS4_OPEN_CLAIM_FH;
2378         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2379                         label, claim, GFP_KERNEL);
2380         if (opendata == NULL)
2381                 goto err_put_state_owner;
2382
2383         if (label) {
2384                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2385                 if (IS_ERR(olabel)) {
2386                         status = PTR_ERR(olabel);
2387                         goto err_opendata_put;
2388                 }
2389         }
2390
2391         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2392                 if (!opendata->f_attr.mdsthreshold) {
2393                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2394                         if (!opendata->f_attr.mdsthreshold)
2395                                 goto err_free_label;
2396                 }
2397                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2398         }
2399         if (dentry->d_inode != NULL)
2400                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2401
2402         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2403         if (status != 0)
2404                 goto err_free_label;
2405         state = ctx->state;
2406
2407         if ((opendata->o_arg.open_flags & O_EXCL) &&
2408             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2409                 nfs4_exclusive_attrset(opendata, sattr);
2410
2411                 nfs_fattr_init(opendata->o_res.f_attr);
2412                 status = nfs4_do_setattr(state->inode, cred,
2413                                 opendata->o_res.f_attr, sattr,
2414                                 state, label, olabel);
2415                 if (status == 0) {
2416                         nfs_setattr_update_inode(state->inode, sattr);
2417                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2418                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2419                 }
2420         }
2421         if (opendata->file_created)
2422                 *opened |= FILE_CREATED;
2423
2424         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2425                 *ctx_th = opendata->f_attr.mdsthreshold;
2426                 opendata->f_attr.mdsthreshold = NULL;
2427         }
2428
2429         nfs4_label_free(olabel);
2430
2431         nfs4_opendata_put(opendata);
2432         nfs4_put_state_owner(sp);
2433         return 0;
2434 err_free_label:
2435         nfs4_label_free(olabel);
2436 err_opendata_put:
2437         nfs4_opendata_put(opendata);
2438 err_put_state_owner:
2439         nfs4_put_state_owner(sp);
2440 out_err:
2441         return status;
2442 }
2443
2444
2445 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2446                                         struct nfs_open_context *ctx,
2447                                         int flags,
2448                                         struct iattr *sattr,
2449                                         struct nfs4_label *label,
2450                                         int *opened)
2451 {
2452         struct nfs_server *server = NFS_SERVER(dir);
2453         struct nfs4_exception exception = { };
2454         struct nfs4_state *res;
2455         int status;
2456
2457         do {
2458                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2459                 res = ctx->state;
2460                 trace_nfs4_open_file(ctx, flags, status);
2461                 if (status == 0)
2462                         break;
2463                 /* NOTE: BAD_SEQID means the server and client disagree about the
2464                  * book-keeping w.r.t. state-changing operations
2465                  * (OPEN/CLOSE/LOCK/LOCKU...)
2466                  * It is actually a sign of a bug on the client or on the server.
2467                  *
2468                  * If we receive a BAD_SEQID error in the particular case of
2469                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2470                  * have unhashed the old state_owner for us, and that we can
2471                  * therefore safely retry using a new one. We should still warn
2472                  * the user though...
2473                  */
2474                 if (status == -NFS4ERR_BAD_SEQID) {
2475                         pr_warn_ratelimited("NFS: v4 server %s "
2476                                         " returned a bad sequence-id error!\n",
2477                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2478                         exception.retry = 1;
2479                         continue;
2480                 }
2481                 /*
2482                  * BAD_STATEID on OPEN means that the server cancelled our
2483                  * state before it received the OPEN_CONFIRM.
2484                  * Recover by retrying the request as per the discussion
2485                  * on Page 181 of RFC3530.
2486                  */
2487                 if (status == -NFS4ERR_BAD_STATEID) {
2488                         exception.retry = 1;
2489                         continue;
2490                 }
2491                 if (status == -EAGAIN) {
2492                         /* We must have found a delegation */
2493                         exception.retry = 1;
2494                         continue;
2495                 }
2496                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2497                         continue;
2498                 res = ERR_PTR(nfs4_handle_exception(server,
2499                                         status, &exception));
2500         } while (exception.retry);
2501         return res;
2502 }
2503
2504 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2505                             struct nfs_fattr *fattr, struct iattr *sattr,
2506                             struct nfs4_state *state, struct nfs4_label *ilabel,
2507                             struct nfs4_label *olabel)
2508 {
2509         struct nfs_server *server = NFS_SERVER(inode);
2510         struct nfs_setattrargs  arg = {
2511                 .fh             = NFS_FH(inode),
2512                 .iap            = sattr,
2513                 .server         = server,
2514                 .bitmask = server->attr_bitmask,
2515                 .label          = ilabel,
2516         };
2517         struct nfs_setattrres  res = {
2518                 .fattr          = fattr,
2519                 .label          = olabel,
2520                 .server         = server,
2521         };
2522         struct rpc_message msg = {
2523                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2524                 .rpc_argp       = &arg,
2525                 .rpc_resp       = &res,
2526                 .rpc_cred       = cred,
2527         };
2528         unsigned long timestamp = jiffies;
2529         fmode_t fmode;
2530         bool truncate;
2531         int status;
2532
2533         arg.bitmask = nfs4_bitmask(server, ilabel);
2534         if (ilabel)
2535                 arg.bitmask = nfs4_bitmask(server, olabel);
2536
2537         nfs_fattr_init(fattr);
2538
2539         /* Servers should only apply open mode checks for file size changes */
2540         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2541         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2542
2543         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2544                 /* Use that stateid */
2545         } else if (truncate && state != NULL) {
2546                 struct nfs_lockowner lockowner = {
2547                         .l_owner = current->files,
2548                         .l_pid = current->tgid,
2549                 };
2550                 if (!nfs4_valid_open_stateid(state))
2551                         return -EBADF;
2552                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2553                                 &lockowner) == -EIO)
2554                         return -EBADF;
2555         } else
2556                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2557
2558         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2559         if (status == 0 && state != NULL)
2560                 renew_lease(server, timestamp);
2561         return status;
2562 }
2563
2564 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2565                            struct nfs_fattr *fattr, struct iattr *sattr,
2566                            struct nfs4_state *state, struct nfs4_label *ilabel,
2567                            struct nfs4_label *olabel)
2568 {
2569         struct nfs_server *server = NFS_SERVER(inode);
2570         struct nfs4_exception exception = {
2571                 .state = state,
2572                 .inode = inode,
2573         };
2574         int err;
2575         do {
2576                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2577                 trace_nfs4_setattr(inode, err);
2578                 switch (err) {
2579                 case -NFS4ERR_OPENMODE:
2580                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2581                                 pr_warn_once("NFSv4: server %s is incorrectly "
2582                                                 "applying open mode checks to "
2583                                                 "a SETATTR that is not "
2584                                                 "changing file size.\n",
2585                                                 server->nfs_client->cl_hostname);
2586                         }
2587                         if (state && !(state->state & FMODE_WRITE)) {
2588                                 err = -EBADF;
2589                                 if (sattr->ia_valid & ATTR_OPEN)
2590                                         err = -EACCES;
2591                                 goto out;
2592                         }
2593                 }
2594                 err = nfs4_handle_exception(server, err, &exception);
2595         } while (exception.retry);
2596 out:
2597         return err;
2598 }
2599
2600 struct nfs4_closedata {
2601         struct inode *inode;
2602         struct nfs4_state *state;
2603         struct nfs_closeargs arg;
2604         struct nfs_closeres res;
2605         struct nfs_fattr fattr;
2606         unsigned long timestamp;
2607         bool roc;
2608         u32 roc_barrier;
2609 };
2610
2611 static void nfs4_free_closedata(void *data)
2612 {
2613         struct nfs4_closedata *calldata = data;
2614         struct nfs4_state_owner *sp = calldata->state->owner;
2615         struct super_block *sb = calldata->state->inode->i_sb;
2616
2617         if (calldata->roc)
2618                 pnfs_roc_release(calldata->state->inode);
2619         nfs4_put_open_state(calldata->state);
2620         nfs_free_seqid(calldata->arg.seqid);
2621         nfs4_put_state_owner(sp);
2622         nfs_sb_deactive(sb);
2623         kfree(calldata);
2624 }
2625
2626 static void nfs4_close_done(struct rpc_task *task, void *data)
2627 {
2628         struct nfs4_closedata *calldata = data;
2629         struct nfs4_state *state = calldata->state;
2630         struct nfs_server *server = NFS_SERVER(calldata->inode);
2631         nfs4_stateid *res_stateid = NULL;
2632
2633         dprintk("%s: begin!\n", __func__);
2634         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2635                 return;
2636         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2637         /* hmm. we are done with the inode, and in the process of freeing
2638          * the state_owner. we keep this around to process errors
2639          */
2640         switch (task->tk_status) {
2641                 case 0:
2642                         res_stateid = &calldata->res.stateid;
2643                         if (calldata->arg.fmode == 0 && calldata->roc)
2644                                 pnfs_roc_set_barrier(state->inode,
2645                                                      calldata->roc_barrier);
2646                         renew_lease(server, calldata->timestamp);
2647                         break;
2648                 case -NFS4ERR_ADMIN_REVOKED:
2649                 case -NFS4ERR_STALE_STATEID:
2650                 case -NFS4ERR_OLD_STATEID:
2651                 case -NFS4ERR_BAD_STATEID:
2652                 case -NFS4ERR_EXPIRED:
2653                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2654                                                 &state->stateid)) {
2655                                 rpc_restart_call_prepare(task);
2656                                 goto out_release;
2657                         }
2658                         if (calldata->arg.fmode == 0)
2659                                 break;
2660                 default:
2661                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2662                                 rpc_restart_call_prepare(task);
2663                                 goto out_release;
2664                         }
2665         }
2666         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2667 out_release:
2668         nfs_release_seqid(calldata->arg.seqid);
2669         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2670         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2671 }
2672
2673 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2674 {
2675         struct nfs4_closedata *calldata = data;
2676         struct nfs4_state *state = calldata->state;
2677         struct inode *inode = calldata->inode;
2678         bool is_rdonly, is_wronly, is_rdwr;
2679         int call_close = 0;
2680
2681         dprintk("%s: begin!\n", __func__);
2682         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2683                 goto out_wait;
2684
2685         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2686         spin_lock(&state->owner->so_lock);
2687         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2688         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2689         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2690         nfs4_stateid_copy(&calldata->arg.stateid, &state->stateid);
2691         /* Calculate the change in open mode */
2692         calldata->arg.fmode = 0;
2693         if (state->n_rdwr == 0) {
2694                 if (state->n_rdonly == 0)
2695                         call_close |= is_rdonly;
2696                 else if (is_rdonly)
2697                         calldata->arg.fmode |= FMODE_READ;
2698                 if (state->n_wronly == 0)
2699                         call_close |= is_wronly;
2700                 else if (is_wronly)
2701                         calldata->arg.fmode |= FMODE_WRITE;
2702         } else if (is_rdwr)
2703                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2704
2705         if (calldata->arg.fmode == 0)
2706                 call_close |= is_rdwr;
2707
2708         if (!nfs4_valid_open_stateid(state))
2709                 call_close = 0;
2710         spin_unlock(&state->owner->so_lock);
2711
2712         if (!call_close) {
2713                 /* Note: exit _without_ calling nfs4_close_done */
2714                 goto out_no_action;
2715         }
2716
2717         if (calldata->arg.fmode == 0) {
2718                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2719                 if (calldata->roc &&
2720                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2721                         nfs_release_seqid(calldata->arg.seqid);
2722                         goto out_wait;
2723                     }
2724         }
2725         calldata->arg.share_access =
2726                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2727                                 calldata->arg.fmode, 0);
2728
2729         nfs_fattr_init(calldata->res.fattr);
2730         calldata->timestamp = jiffies;
2731         if (nfs4_setup_sequence(NFS_SERVER(inode),
2732                                 &calldata->arg.seq_args,
2733                                 &calldata->res.seq_res,
2734                                 task) != 0)
2735                 nfs_release_seqid(calldata->arg.seqid);
2736         dprintk("%s: done!\n", __func__);
2737         return;
2738 out_no_action:
2739         task->tk_action = NULL;
2740 out_wait:
2741         nfs4_sequence_done(task, &calldata->res.seq_res);
2742 }
2743
2744 static const struct rpc_call_ops nfs4_close_ops = {
2745         .rpc_call_prepare = nfs4_close_prepare,
2746         .rpc_call_done = nfs4_close_done,
2747         .rpc_release = nfs4_free_closedata,
2748 };
2749
2750 static bool nfs4_roc(struct inode *inode)
2751 {
2752         if (!nfs_have_layout(inode))
2753                 return false;
2754         return pnfs_roc(inode);
2755 }
2756
2757 /*
2758  * It is possible for data to be read/written from a mem-mapped file
2759  * after the sys_close call (which hits the vfs layer as a flush).
2760  * This means that we can't safely call nfsv4 close on a file until
2761  * the inode is cleared. This in turn means that we are not good
2762  * NFSv4 citizens - we do not indicate to the server to update the file's
2763  * share state even when we are done with one of the three share
2764  * stateid's in the inode.
2765  *
2766  * NOTE: Caller must be holding the sp->so_owner semaphore!
2767  */
2768 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2769 {
2770         struct nfs_server *server = NFS_SERVER(state->inode);
2771         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2772         struct nfs4_closedata *calldata;
2773         struct nfs4_state_owner *sp = state->owner;
2774         struct rpc_task *task;
2775         struct rpc_message msg = {
2776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2777                 .rpc_cred = state->owner->so_cred,
2778         };
2779         struct rpc_task_setup task_setup_data = {
2780                 .rpc_client = server->client,
2781                 .rpc_message = &msg,
2782                 .callback_ops = &nfs4_close_ops,
2783                 .workqueue = nfsiod_workqueue,
2784                 .flags = RPC_TASK_ASYNC,
2785         };
2786         int status = -ENOMEM;
2787
2788         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2789                 &task_setup_data.rpc_client, &msg);
2790
2791         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2792         if (calldata == NULL)
2793                 goto out;
2794         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2795         calldata->inode = state->inode;
2796         calldata->state = state;
2797         calldata->arg.fh = NFS_FH(state->inode);
2798         /* Serialization for the sequence id */
2799         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2800         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2801         if (IS_ERR(calldata->arg.seqid))
2802                 goto out_free_calldata;
2803         calldata->arg.fmode = 0;
2804         calldata->arg.bitmask = server->cache_consistency_bitmask;
2805         calldata->res.fattr = &calldata->fattr;
2806         calldata->res.seqid = calldata->arg.seqid;
2807         calldata->res.server = server;
2808         calldata->roc = nfs4_roc(state->inode);
2809         nfs_sb_active(calldata->inode->i_sb);
2810
2811         msg.rpc_argp = &calldata->arg;
2812         msg.rpc_resp = &calldata->res;
2813         task_setup_data.callback_data = calldata;
2814         task = rpc_run_task(&task_setup_data);
2815         if (IS_ERR(task))
2816                 return PTR_ERR(task);
2817         status = 0;
2818         if (wait)
2819                 status = rpc_wait_for_completion_task(task);
2820         rpc_put_task(task);
2821         return status;
2822 out_free_calldata:
2823         kfree(calldata);
2824 out:
2825         nfs4_put_open_state(state);
2826         nfs4_put_state_owner(sp);
2827         return status;
2828 }
2829
2830 static struct inode *
2831 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2832                 int open_flags, struct iattr *attr, int *opened)
2833 {
2834         struct nfs4_state *state;
2835         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2836
2837         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2838
2839         /* Protect against concurrent sillydeletes */
2840         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2841
2842         nfs4_label_release_security(label);
2843
2844         if (IS_ERR(state))
2845                 return ERR_CAST(state);
2846         return state->inode;
2847 }
2848
2849 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2850 {
2851         if (ctx->state == NULL)
2852                 return;
2853         if (is_sync)
2854                 nfs4_close_sync(ctx->state, ctx->mode);
2855         else
2856                 nfs4_close_state(ctx->state, ctx->mode);
2857 }
2858
2859 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2860 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2861 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2862
2863 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2864 {
2865         struct nfs4_server_caps_arg args = {
2866                 .fhandle = fhandle,
2867         };
2868         struct nfs4_server_caps_res res = {};
2869         struct rpc_message msg = {
2870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2871                 .rpc_argp = &args,
2872                 .rpc_resp = &res,
2873         };
2874         int status;
2875
2876         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2877         if (status == 0) {
2878                 /* Sanity check the server answers */
2879                 switch (server->nfs_client->cl_minorversion) {
2880                 case 0:
2881                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2882                         res.attr_bitmask[2] = 0;
2883                         break;
2884                 case 1:
2885                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2886                         break;
2887                 case 2:
2888                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2889                 }
2890                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2891                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2892                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2893                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2894                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2895                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2896                                 NFS_CAP_SECURITY_LABEL);
2897                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2898                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2899                         server->caps |= NFS_CAP_ACLS;
2900                 if (res.has_links != 0)
2901                         server->caps |= NFS_CAP_HARDLINKS;
2902                 if (res.has_symlinks != 0)
2903                         server->caps |= NFS_CAP_SYMLINKS;
2904                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2905                         server->caps |= NFS_CAP_FILEID;
2906                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2907                         server->caps |= NFS_CAP_MODE;
2908                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2909                         server->caps |= NFS_CAP_NLINK;
2910                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2911                         server->caps |= NFS_CAP_OWNER;
2912                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2913                         server->caps |= NFS_CAP_OWNER_GROUP;
2914                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2915                         server->caps |= NFS_CAP_ATIME;
2916                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2917                         server->caps |= NFS_CAP_CTIME;
2918                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2919                         server->caps |= NFS_CAP_MTIME;
2920 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2921                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2922                         server->caps |= NFS_CAP_SECURITY_LABEL;
2923 #endif
2924                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2925                                 sizeof(server->attr_bitmask));
2926                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2927
2928                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2929                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2930                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2931                 server->cache_consistency_bitmask[2] = 0;
2932                 server->acl_bitmask = res.acl_bitmask;
2933                 server->fh_expire_type = res.fh_expire_type;
2934         }
2935
2936         return status;
2937 }
2938
2939 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2940 {
2941         struct nfs4_exception exception = { };
2942         int err;
2943         do {
2944                 err = nfs4_handle_exception(server,
2945                                 _nfs4_server_capabilities(server, fhandle),
2946                                 &exception);
2947         } while (exception.retry);
2948         return err;
2949 }
2950
2951 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2952                 struct nfs_fsinfo *info)
2953 {
2954         u32 bitmask[3];
2955         struct nfs4_lookup_root_arg args = {
2956                 .bitmask = bitmask,
2957         };
2958         struct nfs4_lookup_res res = {
2959                 .server = server,
2960                 .fattr = info->fattr,
2961                 .fh = fhandle,
2962         };
2963         struct rpc_message msg = {
2964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2965                 .rpc_argp = &args,
2966                 .rpc_resp = &res,
2967         };
2968
2969         bitmask[0] = nfs4_fattr_bitmap[0];
2970         bitmask[1] = nfs4_fattr_bitmap[1];
2971         /*
2972          * Process the label in the upcoming getfattr
2973          */
2974         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2975
2976         nfs_fattr_init(info->fattr);
2977         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2978 }
2979
2980 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2981                 struct nfs_fsinfo *info)
2982 {
2983         struct nfs4_exception exception = { };
2984         int err;
2985         do {
2986                 err = _nfs4_lookup_root(server, fhandle, info);
2987                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2988                 switch (err) {
2989                 case 0:
2990                 case -NFS4ERR_WRONGSEC:
2991                         goto out;
2992                 default:
2993                         err = nfs4_handle_exception(server, err, &exception);
2994                 }
2995         } while (exception.retry);
2996 out:
2997         return err;
2998 }
2999
3000 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3001                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3002 {
3003         struct rpc_auth_create_args auth_args = {
3004                 .pseudoflavor = flavor,
3005         };
3006         struct rpc_auth *auth;
3007         int ret;
3008
3009         auth = rpcauth_create(&auth_args, server->client);
3010         if (IS_ERR(auth)) {
3011                 ret = -EACCES;
3012                 goto out;
3013         }
3014         ret = nfs4_lookup_root(server, fhandle, info);
3015 out:
3016         return ret;
3017 }
3018
3019 /*
3020  * Retry pseudoroot lookup with various security flavors.  We do this when:
3021  *
3022  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3023  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3024  *
3025  * Returns zero on success, or a negative NFS4ERR value, or a
3026  * negative errno value.
3027  */
3028 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3029                               struct nfs_fsinfo *info)
3030 {
3031         /* Per 3530bis 15.33.5 */
3032         static const rpc_authflavor_t flav_array[] = {
3033                 RPC_AUTH_GSS_KRB5P,
3034                 RPC_AUTH_GSS_KRB5I,
3035                 RPC_AUTH_GSS_KRB5,
3036                 RPC_AUTH_UNIX,                  /* courtesy */
3037                 RPC_AUTH_NULL,
3038         };
3039         int status = -EPERM;
3040         size_t i;
3041
3042         if (server->auth_info.flavor_len > 0) {
3043                 /* try each flavor specified by user */
3044                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3045                         status = nfs4_lookup_root_sec(server, fhandle, info,
3046                                                 server->auth_info.flavors[i]);
3047                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3048                                 continue;
3049                         break;
3050                 }
3051         } else {
3052                 /* no flavors specified by user, try default list */
3053                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3054                         status = nfs4_lookup_root_sec(server, fhandle, info,
3055                                                       flav_array[i]);
3056                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3057                                 continue;
3058                         break;
3059                 }
3060         }
3061
3062         /*
3063          * -EACCESS could mean that the user doesn't have correct permissions
3064          * to access the mount.  It could also mean that we tried to mount
3065          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3066          * existing mount programs don't handle -EACCES very well so it should
3067          * be mapped to -EPERM instead.
3068          */
3069         if (status == -EACCES)
3070                 status = -EPERM;
3071         return status;
3072 }
3073
3074 static int nfs4_do_find_root_sec(struct nfs_server *server,
3075                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3076 {
3077         int mv = server->nfs_client->cl_minorversion;
3078         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3079 }
3080
3081 /**
3082  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3083  * @server: initialized nfs_server handle
3084  * @fhandle: we fill in the pseudo-fs root file handle
3085  * @info: we fill in an FSINFO struct
3086  * @auth_probe: probe the auth flavours
3087  *
3088  * Returns zero on success, or a negative errno.
3089  */
3090 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3091                          struct nfs_fsinfo *info,
3092                          bool auth_probe)
3093 {
3094         int status;
3095
3096         switch (auth_probe) {
3097         case false:
3098                 status = nfs4_lookup_root(server, fhandle, info);
3099                 if (status != -NFS4ERR_WRONGSEC)
3100                         break;
3101         default:
3102                 status = nfs4_do_find_root_sec(server, fhandle, info);
3103         }
3104
3105         if (status == 0)
3106                 status = nfs4_server_capabilities(server, fhandle);
3107         if (status == 0)
3108                 status = nfs4_do_fsinfo(server, fhandle, info);
3109
3110         return nfs4_map_errors(status);
3111 }
3112
3113 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3114                               struct nfs_fsinfo *info)
3115 {
3116         int error;
3117         struct nfs_fattr *fattr = info->fattr;
3118         struct nfs4_label *label = NULL;
3119
3120         error = nfs4_server_capabilities(server, mntfh);
3121         if (error < 0) {
3122                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3123                 return error;
3124         }
3125
3126         label = nfs4_label_alloc(server, GFP_KERNEL);
3127         if (IS_ERR(label))
3128                 return PTR_ERR(label);
3129
3130         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3131         if (error < 0) {
3132                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3133                 goto err_free_label;
3134         }
3135
3136         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3137             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3138                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3139
3140 err_free_label:
3141         nfs4_label_free(label);
3142
3143         return error;
3144 }
3145
3146 /*
3147  * Get locations and (maybe) other attributes of a referral.
3148  * Note that we'll actually follow the referral later when
3149  * we detect fsid mismatch in inode revalidation
3150  */
3151 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3152                              const struct qstr *name, struct nfs_fattr *fattr,
3153                              struct nfs_fh *fhandle)
3154 {
3155         int status = -ENOMEM;
3156         struct page *page = NULL;
3157         struct nfs4_fs_locations *locations = NULL;
3158
3159         page = alloc_page(GFP_KERNEL);
3160         if (page == NULL)
3161                 goto out;
3162         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3163         if (locations == NULL)
3164                 goto out;
3165
3166         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3167         if (status != 0)
3168                 goto out;
3169
3170         /*
3171          * If the fsid didn't change, this is a migration event, not a
3172          * referral.  Cause us to drop into the exception handler, which
3173          * will kick off migration recovery.
3174          */
3175         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3176                 dprintk("%s: server did not return a different fsid for"
3177                         " a referral at %s\n", __func__, name->name);
3178                 status = -NFS4ERR_MOVED;
3179                 goto out;
3180         }
3181         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3182         nfs_fixup_referral_attributes(&locations->fattr);
3183
3184         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3185         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3186         memset(fhandle, 0, sizeof(struct nfs_fh));
3187 out:
3188         if (page)
3189                 __free_page(page);
3190         kfree(locations);
3191         return status;
3192 }
3193
3194 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3195                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3196 {
3197         struct nfs4_getattr_arg args = {
3198                 .fh = fhandle,
3199                 .bitmask = server->attr_bitmask,
3200         };
3201         struct nfs4_getattr_res res = {
3202                 .fattr = fattr,
3203                 .label = label,
3204                 .server = server,
3205         };
3206         struct rpc_message msg = {
3207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3208                 .rpc_argp = &args,
3209                 .rpc_resp = &res,
3210         };
3211
3212         args.bitmask = nfs4_bitmask(server, label);
3213
3214         nfs_fattr_init(fattr);
3215         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3216 }
3217
3218 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3219                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3220 {
3221         struct nfs4_exception exception = { };
3222         int err;
3223         do {
3224                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3225                 trace_nfs4_getattr(server, fhandle, fattr, err);
3226                 err = nfs4_handle_exception(server, err,
3227                                 &exception);
3228         } while (exception.retry);
3229         return err;
3230 }
3231
3232 /*
3233  * The file is not closed if it is opened due to the a request to change
3234  * the size of the file. The open call will not be needed once the
3235  * VFS layer lookup-intents are implemented.
3236  *
3237  * Close is called when the inode is destroyed.
3238  * If we haven't opened the file for O_WRONLY, we
3239  * need to in the size_change case to obtain a stateid.
3240  *
3241  * Got race?
3242  * Because OPEN is always done by name in nfsv4, it is
3243  * possible that we opened a different file by the same
3244  * name.  We can recognize this race condition, but we
3245  * can't do anything about it besides returning an error.
3246  *
3247  * This will be fixed with VFS changes (lookup-intent).
3248  */
3249 static int
3250 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3251                   struct iattr *sattr)
3252 {
3253         struct inode *inode = dentry->d_inode;
3254         struct rpc_cred *cred = NULL;
3255         struct nfs4_state *state = NULL;
3256         struct nfs4_label *label = NULL;
3257         int status;
3258
3259         if (pnfs_ld_layoutret_on_setattr(inode) &&
3260             sattr->ia_valid & ATTR_SIZE &&
3261             sattr->ia_size < i_size_read(inode))
3262                 pnfs_commit_and_return_layout(inode);
3263
3264         nfs_fattr_init(fattr);
3265
3266         /* Deal with open(O_TRUNC) */
3267         if (sattr->ia_valid & ATTR_OPEN)
3268                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3269
3270         /* Optimization: if the end result is no change, don't RPC */
3271         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3272                 return 0;
3273
3274         /* Search for an existing open(O_WRITE) file */
3275         if (sattr->ia_valid & ATTR_FILE) {
3276                 struct nfs_open_context *ctx;
3277
3278                 ctx = nfs_file_open_context(sattr->ia_file);
3279                 if (ctx) {
3280                         cred = ctx->cred;
3281                         state = ctx->state;
3282                 }
3283         }
3284
3285         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3286         if (IS_ERR(label))
3287                 return PTR_ERR(label);
3288
3289         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3290         if (status == 0) {
3291                 nfs_setattr_update_inode(inode, sattr);
3292                 nfs_setsecurity(inode, fattr, label);
3293         }
3294         nfs4_label_free(label);
3295         return status;
3296 }
3297
3298 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3299                 const struct qstr *name, struct nfs_fh *fhandle,
3300                 struct nfs_fattr *fattr, struct nfs4_label *label)
3301 {
3302         struct nfs_server *server = NFS_SERVER(dir);
3303         int                    status;
3304         struct nfs4_lookup_arg args = {
3305                 .bitmask = server->attr_bitmask,
3306                 .dir_fh = NFS_FH(dir),
3307                 .name = name,
3308         };
3309         struct nfs4_lookup_res res = {
3310                 .server = server,
3311                 .fattr = fattr,
3312                 .label = label,
3313                 .fh = fhandle,
3314         };
3315         struct rpc_message msg = {
3316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3317                 .rpc_argp = &args,
3318                 .rpc_resp = &res,
3319         };
3320
3321         args.bitmask = nfs4_bitmask(server, label);
3322
3323         nfs_fattr_init(fattr);
3324
3325         dprintk("NFS call  lookup %s\n", name->name);
3326         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3327         dprintk("NFS reply lookup: %d\n", status);
3328         return status;
3329 }
3330
3331 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3332 {
3333         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3334                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3335         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3336         fattr->nlink = 2;
3337 }
3338
3339 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3340                                    struct qstr *name, struct nfs_fh *fhandle,
3341                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3342 {
3343         struct nfs4_exception exception = { };
3344         struct rpc_clnt *client = *clnt;
3345         int err;
3346         do {
3347                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3348                 trace_nfs4_lookup(dir, name, err);
3349                 switch (err) {
3350                 case -NFS4ERR_BADNAME:
3351                         err = -ENOENT;
3352                         goto out;
3353                 case -NFS4ERR_MOVED:
3354                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3355                         goto out;
3356                 case -NFS4ERR_WRONGSEC:
3357                         err = -EPERM;
3358                         if (client != *clnt)
3359                                 goto out;
3360                         client = nfs4_negotiate_security(client, dir, name);
3361                         if (IS_ERR(client))
3362                                 return PTR_ERR(client);
3363
3364                         exception.retry = 1;
3365                         break;
3366                 default:
3367                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3368                 }
3369         } while (exception.retry);
3370
3371 out:
3372         if (err == 0)
3373                 *clnt = client;
3374         else if (client != *clnt)
3375                 rpc_shutdown_client(client);
3376
3377         return err;
3378 }
3379
3380 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3381                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3382                             struct nfs4_label *label)
3383 {
3384         int status;
3385         struct rpc_clnt *client = NFS_CLIENT(dir);
3386
3387         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3388         if (client != NFS_CLIENT(dir)) {
3389                 rpc_shutdown_client(client);
3390                 nfs_fixup_secinfo_attributes(fattr);
3391         }
3392         return status;
3393 }
3394
3395 struct rpc_clnt *
3396 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3397                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3398 {
3399         struct rpc_clnt *client = NFS_CLIENT(dir);
3400         int status;
3401
3402         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3403         if (status < 0)
3404                 return ERR_PTR(status);
3405         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3406 }
3407
3408 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3409 {
3410         struct nfs_server *server = NFS_SERVER(inode);
3411         struct nfs4_accessargs args = {
3412                 .fh = NFS_FH(inode),
3413                 .bitmask = server->cache_consistency_bitmask,
3414         };
3415         struct nfs4_accessres res = {
3416                 .server = server,
3417         };
3418         struct rpc_message msg = {
3419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3420                 .rpc_argp = &args,
3421                 .rpc_resp = &res,
3422                 .rpc_cred = entry->cred,
3423         };
3424         int mode = entry->mask;
3425         int status = 0;
3426
3427         /*
3428          * Determine which access bits we want to ask for...
3429          */
3430         if (mode & MAY_READ)
3431                 args.access |= NFS4_ACCESS_READ;
3432         if (S_ISDIR(inode->i_mode)) {
3433                 if (mode & MAY_WRITE)
3434                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3435                 if (mode & MAY_EXEC)
3436                         args.access |= NFS4_ACCESS_LOOKUP;
3437         } else {
3438                 if (mode & MAY_WRITE)
3439                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3440                 if (mode & MAY_EXEC)
3441                         args.access |= NFS4_ACCESS_EXECUTE;
3442         }
3443
3444         res.fattr = nfs_alloc_fattr();
3445         if (res.fattr == NULL)
3446                 return -ENOMEM;
3447
3448         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3449         if (!status) {
3450                 nfs_access_set_mask(entry, res.access);
3451                 nfs_refresh_inode(inode, res.fattr);
3452         }
3453         nfs_free_fattr(res.fattr);
3454         return status;
3455 }
3456
3457 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3458 {
3459         struct nfs4_exception exception = { };
3460         int err;
3461         do {
3462                 err = _nfs4_proc_access(inode, entry);
3463                 trace_nfs4_access(inode, err);
3464                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3465                                 &exception);
3466         } while (exception.retry);
3467         return err;
3468 }
3469
3470 /*
3471  * TODO: For the time being, we don't try to get any attributes
3472  * along with any of the zero-copy operations READ, READDIR,
3473  * READLINK, WRITE.
3474  *
3475  * In the case of the first three, we want to put the GETATTR
3476  * after the read-type operation -- this is because it is hard
3477  * to predict the length of a GETATTR response in v4, and thus
3478  * align the READ data correctly.  This means that the GETATTR
3479  * may end up partially falling into the page cache, and we should
3480  * shift it into the 'tail' of the xdr_buf before processing.
3481  * To do this efficiently, we need to know the total length
3482  * of data received, which doesn't seem to be available outside
3483  * of the RPC layer.
3484  *
3485  * In the case of WRITE, we also want to put the GETATTR after
3486  * the operation -- in this case because we want to make sure
3487  * we get the post-operation mtime and size.
3488  *
3489  * Both of these changes to the XDR layer would in fact be quite
3490  * minor, but I decided to leave them for a subsequent patch.
3491  */
3492 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3493                 unsigned int pgbase, unsigned int pglen)
3494 {
3495         struct nfs4_readlink args = {
3496                 .fh       = NFS_FH(inode),
3497                 .pgbase   = pgbase,
3498                 .pglen    = pglen,
3499                 .pages    = &page,
3500         };
3501         struct nfs4_readlink_res res;
3502         struct rpc_message msg = {
3503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3504                 .rpc_argp = &args,
3505                 .rpc_resp = &res,
3506         };
3507
3508         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3509 }
3510
3511 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3512                 unsigned int pgbase, unsigned int pglen)
3513 {
3514         struct nfs4_exception exception = { };
3515         int err;
3516         do {
3517                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3518                 trace_nfs4_readlink(inode, err);
3519                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3520                                 &exception);
3521         } while (exception.retry);
3522         return err;
3523 }
3524
3525 /*
3526  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3527  */
3528 static int
3529 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3530                  int flags)
3531 {
3532         struct nfs4_label l, *ilabel = NULL;
3533         struct nfs_open_context *ctx;
3534         struct nfs4_state *state;
3535         int opened = 0;
3536         int status = 0;
3537
3538         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3539         if (IS_ERR(ctx))
3540                 return PTR_ERR(ctx);
3541
3542         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3543
3544         sattr->ia_mode &= ~current_umask();
3545         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3546         if (IS_ERR(state)) {
3547                 status = PTR_ERR(state);
3548                 goto out;
3549         }
3550 out:
3551         nfs4_label_release_security(ilabel);
3552         put_nfs_open_context(ctx);
3553         return status;
3554 }
3555
3556 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3557 {
3558         struct nfs_server *server = NFS_SERVER(dir);
3559         struct nfs_removeargs args = {
3560                 .fh = NFS_FH(dir),
3561                 .name = *name,
3562         };
3563         struct nfs_removeres res = {
3564                 .server = server,
3565         };
3566         struct rpc_message msg = {
3567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3568                 .rpc_argp = &args,
3569                 .rpc_resp = &res,
3570         };
3571         int status;
3572
3573         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3574         if (status == 0)
3575                 update_changeattr(dir, &res.cinfo);
3576         return status;
3577 }
3578
3579 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3580 {
3581         struct nfs4_exception exception = { };
3582         int err;
3583         do {
3584                 err = _nfs4_proc_remove(dir, name);
3585                 trace_nfs4_remove(dir, name, err);
3586                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3587                                 &exception);
3588         } while (exception.retry);
3589         return err;
3590 }
3591
3592 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3593 {
3594         struct nfs_server *server = NFS_SERVER(dir);
3595         struct nfs_removeargs *args = msg->rpc_argp;
3596         struct nfs_removeres *res = msg->rpc_resp;
3597
3598         res->server = server;
3599         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3600         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3601
3602         nfs_fattr_init(res->dir_attr);
3603 }
3604
3605 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3606 {
3607         nfs4_setup_sequence(NFS_SERVER(data->dir),
3608                         &data->args.seq_args,
3609                         &data->res.seq_res,
3610                         task);
3611 }
3612
3613 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3614 {
3615         struct nfs_unlinkdata *data = task->tk_calldata;
3616         struct nfs_removeres *res = &data->res;
3617
3618         if (!nfs4_sequence_done(task, &res->seq_res))
3619                 return 0;
3620         if (nfs4_async_handle_error(task, res->server, NULL,
3621                                     &data->timeout) == -EAGAIN)
3622                 return 0;
3623         update_changeattr(dir, &res->cinfo);
3624         return 1;
3625 }
3626
3627 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3628 {
3629         struct nfs_server *server = NFS_SERVER(dir);
3630         struct nfs_renameargs *arg = msg->rpc_argp;
3631         struct nfs_renameres *res = msg->rpc_resp;
3632
3633         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3634         res->server = server;
3635         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3636 }
3637
3638 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3639 {
3640         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3641                         &data->args.seq_args,
3642                         &data->res.seq_res,
3643                         task);
3644 }
3645
3646 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3647                                  struct inode *new_dir)
3648 {
3649         struct nfs_renamedata *data = task->tk_calldata;
3650         struct nfs_renameres *res = &data->res;
3651
3652         if (!nfs4_sequence_done(task, &res->seq_res))
3653                 return 0;
3654         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3655                 return 0;
3656
3657         update_changeattr(old_dir, &res->old_cinfo);
3658         update_changeattr(new_dir, &res->new_cinfo);
3659         return 1;
3660 }
3661
3662 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3663 {
3664         struct nfs_server *server = NFS_SERVER(inode);
3665         struct nfs4_link_arg arg = {
3666                 .fh     = NFS_FH(inode),
3667                 .dir_fh = NFS_FH(dir),
3668                 .name   = name,
3669                 .bitmask = server->attr_bitmask,
3670         };
3671         struct nfs4_link_res res = {
3672                 .server = server,
3673                 .label = NULL,
3674         };
3675         struct rpc_message msg = {
3676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3677                 .rpc_argp = &arg,
3678                 .rpc_resp = &res,
3679         };
3680         int status = -ENOMEM;
3681
3682         res.fattr = nfs_alloc_fattr();
3683         if (res.fattr == NULL)
3684                 goto out;
3685
3686         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3687         if (IS_ERR(res.label)) {
3688                 status = PTR_ERR(res.label);
3689                 goto out;
3690         }
3691         arg.bitmask = nfs4_bitmask(server, res.label);
3692
3693         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3694         if (!status) {
3695                 update_changeattr(dir, &res.cinfo);
3696                 status = nfs_post_op_update_inode(inode, res.fattr);
3697                 if (!status)
3698                         nfs_setsecurity(inode, res.fattr, res.label);
3699         }
3700
3701
3702         nfs4_label_free(res.label);
3703
3704 out:
3705         nfs_free_fattr(res.fattr);
3706         return status;
3707 }
3708
3709 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3710 {
3711         struct nfs4_exception exception = { };
3712         int err;
3713         do {
3714                 err = nfs4_handle_exception(NFS_SERVER(inode),
3715                                 _nfs4_proc_link(inode, dir, name),
3716                                 &exception);
3717         } while (exception.retry);
3718         return err;
3719 }
3720
3721 struct nfs4_createdata {
3722         struct rpc_message msg;
3723         struct nfs4_create_arg arg;
3724         struct nfs4_create_res res;
3725         struct nfs_fh fh;
3726         struct nfs_fattr fattr;
3727         struct nfs4_label *label;
3728 };
3729
3730 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3731                 struct qstr *name, struct iattr *sattr, u32 ftype)
3732 {
3733         struct nfs4_createdata *data;
3734
3735         data = kzalloc(sizeof(*data), GFP_KERNEL);
3736         if (data != NULL) {
3737                 struct nfs_server *server = NFS_SERVER(dir);
3738
3739                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3740                 if (IS_ERR(data->label))
3741                         goto out_free;
3742
3743                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3744                 data->msg.rpc_argp = &data->arg;
3745                 data->msg.rpc_resp = &data->res;
3746                 data->arg.dir_fh = NFS_FH(dir);
3747                 data->arg.server = server;
3748                 data->arg.name = name;
3749                 data->arg.attrs = sattr;
3750                 data->arg.ftype = ftype;
3751                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3752                 data->res.server = server;
3753                 data->res.fh = &data->fh;
3754                 data->res.fattr = &data->fattr;
3755                 data->res.label = data->label;
3756                 nfs_fattr_init(data->res.fattr);
3757         }
3758         return data;
3759 out_free:
3760         kfree(data);
3761         return NULL;
3762 }
3763
3764 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3765 {
3766         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3767                                     &data->arg.seq_args, &data->res.seq_res, 1);
3768         if (status == 0) {
3769                 update_changeattr(dir, &data->res.dir_cinfo);
3770                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3771         }
3772         return status;
3773 }
3774
3775 static void nfs4_free_createdata(struct nfs4_createdata *data)
3776 {
3777         nfs4_label_free(data->label);
3778         kfree(data);
3779 }
3780
3781 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3782                 struct page *page, unsigned int len, struct iattr *sattr,
3783                 struct nfs4_label *label)
3784 {
3785         struct nfs4_createdata *data;
3786         int status = -ENAMETOOLONG;
3787
3788         if (len > NFS4_MAXPATHLEN)
3789                 goto out;
3790
3791         status = -ENOMEM;
3792         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3793         if (data == NULL)
3794                 goto out;
3795
3796         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3797         data->arg.u.symlink.pages = &page;
3798         data->arg.u.symlink.len = len;
3799         data->arg.label = label;
3800
3801         status = nfs4_do_create(dir, dentry, data);
3802
3803         nfs4_free_createdata(data);
3804 out:
3805         return status;
3806 }
3807
3808 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3809                 struct page *page, unsigned int len, struct iattr *sattr)
3810 {
3811         struct nfs4_exception exception = { };
3812         struct nfs4_label l, *label = NULL;
3813         int err;
3814
3815         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3816
3817         do {
3818                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3819                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3820                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3821                                 &exception);
3822         } while (exception.retry);
3823
3824         nfs4_label_release_security(label);
3825         return err;
3826 }
3827
3828 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3829                 struct iattr *sattr, struct nfs4_label *label)
3830 {
3831         struct nfs4_createdata *data;
3832         int status = -ENOMEM;
3833
3834         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3835         if (data == NULL)
3836                 goto out;
3837
3838         data->arg.label = label;
3839         status = nfs4_do_create(dir, dentry, data);
3840
3841         nfs4_free_createdata(data);
3842 out:
3843         return status;
3844 }
3845
3846 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3847                 struct iattr *sattr)
3848 {
3849         struct nfs4_exception exception = { };
3850         struct nfs4_label l, *label = NULL;
3851         int err;
3852
3853         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3854
3855         sattr->ia_mode &= ~current_umask();
3856         do {
3857                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3858                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3859                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3860                                 &exception);
3861         } while (exception.retry);
3862         nfs4_label_release_security(label);
3863
3864         return err;
3865 }
3866
3867 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3868                 u64 cookie, struct page **pages, unsigned int count, int plus)
3869 {
3870         struct inode            *dir = dentry->d_inode;
3871         struct nfs4_readdir_arg args = {
3872                 .fh = NFS_FH(dir),
3873                 .pages = pages,
3874                 .pgbase = 0,
3875                 .count = count,
3876                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3877                 .plus = plus,
3878         };
3879         struct nfs4_readdir_res res;
3880         struct rpc_message msg = {
3881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3882                 .rpc_argp = &args,
3883                 .rpc_resp = &res,
3884                 .rpc_cred = cred,
3885         };
3886         int                     status;
3887
3888         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3889                         dentry,
3890                         (unsigned long long)cookie);
3891         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3892         res.pgbase = args.pgbase;
3893         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3894         if (status >= 0) {
3895                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3896                 status += args.pgbase;
3897         }
3898
3899         nfs_invalidate_atime(dir);
3900
3901         dprintk("%s: returns %d\n", __func__, status);
3902         return status;
3903 }
3904
3905 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3906                 u64 cookie, struct page **pages, unsigned int count, int plus)
3907 {
3908         struct nfs4_exception exception = { };
3909         int err;
3910         do {
3911                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3912                                 pages, count, plus);
3913                 trace_nfs4_readdir(dentry->d_inode, err);
3914                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3915                                 &exception);
3916         } while (exception.retry);
3917         return err;
3918 }
3919
3920 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3921                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3922 {
3923         struct nfs4_createdata *data;
3924         int mode = sattr->ia_mode;
3925         int status = -ENOMEM;
3926
3927         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3928         if (data == NULL)
3929                 goto out;
3930
3931         if (S_ISFIFO(mode))
3932                 data->arg.ftype = NF4FIFO;
3933         else if (S_ISBLK(mode)) {
3934                 data->arg.ftype = NF4BLK;
3935                 data->arg.u.device.specdata1 = MAJOR(rdev);
3936                 data->arg.u.device.specdata2 = MINOR(rdev);
3937         }
3938         else if (S_ISCHR(mode)) {
3939                 data->arg.ftype = NF4CHR;
3940                 data->arg.u.device.specdata1 = MAJOR(rdev);
3941                 data->arg.u.device.specdata2 = MINOR(rdev);
3942         } else if (!S_ISSOCK(mode)) {
3943                 status = -EINVAL;
3944                 goto out_free;
3945         }
3946
3947         data->arg.label = label;
3948         status = nfs4_do_create(dir, dentry, data);
3949 out_free:
3950         nfs4_free_createdata(data);
3951 out:
3952         return status;
3953 }
3954
3955 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3956                 struct iattr *sattr, dev_t rdev)
3957 {
3958         struct nfs4_exception exception = { };
3959         struct nfs4_label l, *label = NULL;
3960         int err;
3961
3962         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3963
3964         sattr->ia_mode &= ~current_umask();
3965         do {
3966                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3967                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3968                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3969                                 &exception);
3970         } while (exception.retry);
3971
3972         nfs4_label_release_security(label);
3973
3974         return err;
3975 }
3976
3977 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3978                  struct nfs_fsstat *fsstat)
3979 {
3980         struct nfs4_statfs_arg args = {
3981                 .fh = fhandle,
3982                 .bitmask = server->attr_bitmask,
3983         };
3984         struct nfs4_statfs_res res = {
3985                 .fsstat = fsstat,
3986         };
3987         struct rpc_message msg = {
3988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3989                 .rpc_argp = &args,
3990                 .rpc_resp = &res,
3991         };
3992
3993         nfs_fattr_init(fsstat->fattr);
3994         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3995 }
3996
3997 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3998 {
3999         struct nfs4_exception exception = { };
4000         int err;
4001         do {
4002                 err = nfs4_handle_exception(server,
4003                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4004                                 &exception);
4005         } while (exception.retry);
4006         return err;
4007 }
4008
4009 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4010                 struct nfs_fsinfo *fsinfo)
4011 {
4012         struct nfs4_fsinfo_arg args = {
4013                 .fh = fhandle,
4014                 .bitmask = server->attr_bitmask,
4015         };
4016         struct nfs4_fsinfo_res res = {
4017                 .fsinfo = fsinfo,
4018         };
4019         struct rpc_message msg = {
4020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4021                 .rpc_argp = &args,
4022                 .rpc_resp = &res,
4023         };
4024
4025         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4026 }
4027
4028 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4029 {
4030         struct nfs4_exception exception = { };
4031         unsigned long now = jiffies;
4032         int err;
4033
4034         do {
4035                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4036                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4037                 if (err == 0) {
4038                         struct nfs_client *clp = server->nfs_client;
4039
4040                         spin_lock(&clp->cl_lock);
4041                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4042                         clp->cl_last_renewal = now;
4043                         spin_unlock(&clp->cl_lock);
4044                         break;
4045                 }
4046                 err = nfs4_handle_exception(server, err, &exception);
4047         } while (exception.retry);
4048         return err;
4049 }
4050
4051 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4052 {
4053         int error;
4054
4055         nfs_fattr_init(fsinfo->fattr);
4056         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4057         if (error == 0) {
4058                 /* block layout checks this! */
4059                 server->pnfs_blksize = fsinfo->blksize;
4060                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4061         }
4062
4063         return error;
4064 }
4065
4066 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4067                 struct nfs_pathconf *pathconf)
4068 {
4069         struct nfs4_pathconf_arg args = {
4070                 .fh = fhandle,
4071                 .bitmask = server->attr_bitmask,
4072         };
4073         struct nfs4_pathconf_res res = {
4074                 .pathconf = pathconf,
4075         };
4076         struct rpc_message msg = {
4077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4078                 .rpc_argp = &args,
4079                 .rpc_resp = &res,
4080         };
4081
4082         /* None of the pathconf attributes are mandatory to implement */
4083         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4084                 memset(pathconf, 0, sizeof(*pathconf));
4085                 return 0;
4086         }
4087
4088         nfs_fattr_init(pathconf->fattr);
4089         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4090 }
4091
4092 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4093                 struct nfs_pathconf *pathconf)
4094 {
4095         struct nfs4_exception exception = { };
4096         int err;
4097
4098         do {
4099                 err = nfs4_handle_exception(server,
4100                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4101                                 &exception);
4102         } while (exception.retry);
4103         return err;
4104 }
4105
4106 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4107                 const struct nfs_open_context *ctx,
4108                 const struct nfs_lock_context *l_ctx,
4109                 fmode_t fmode)
4110 {
4111         const struct nfs_lockowner *lockowner = NULL;
4112
4113         if (l_ctx != NULL)
4114                 lockowner = &l_ctx->lockowner;
4115         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4116 }
4117 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4118
4119 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4120                 const struct nfs_open_context *ctx,
4121                 const struct nfs_lock_context *l_ctx,
4122                 fmode_t fmode)
4123 {
4124         nfs4_stateid current_stateid;
4125
4126         /* If the current stateid represents a lost lock, then exit */
4127         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4128                 return true;
4129         return nfs4_stateid_match(stateid, &current_stateid);
4130 }
4131
4132 static bool nfs4_error_stateid_expired(int err)
4133 {
4134         switch (err) {
4135         case -NFS4ERR_DELEG_REVOKED:
4136         case -NFS4ERR_ADMIN_REVOKED:
4137         case -NFS4ERR_BAD_STATEID:
4138         case -NFS4ERR_STALE_STATEID:
4139         case -NFS4ERR_OLD_STATEID:
4140         case -NFS4ERR_OPENMODE:
4141         case -NFS4ERR_EXPIRED:
4142                 return true;
4143         }
4144         return false;
4145 }
4146
4147 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4148 {
4149         nfs_invalidate_atime(hdr->inode);
4150 }
4151
4152 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4153 {
4154         struct nfs_server *server = NFS_SERVER(hdr->inode);
4155
4156         trace_nfs4_read(hdr, task->tk_status);
4157         if (nfs4_async_handle_error(task, server,
4158                                     hdr->args.context->state,
4159                                     NULL) == -EAGAIN) {
4160                 rpc_restart_call_prepare(task);
4161                 return -EAGAIN;
4162         }
4163
4164         __nfs4_read_done_cb(hdr);
4165         if (task->tk_status > 0)
4166                 renew_lease(server, hdr->timestamp);
4167         return 0;
4168 }
4169
4170 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4171                 struct nfs_pgio_args *args)
4172 {
4173
4174         if (!nfs4_error_stateid_expired(task->tk_status) ||
4175                 nfs4_stateid_is_current(&args->stateid,
4176                                 args->context,
4177                                 args->lock_context,
4178                                 FMODE_READ))
4179                 return false;
4180         rpc_restart_call_prepare(task);
4181         return true;
4182 }
4183
4184 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4185 {
4186
4187         dprintk("--> %s\n", __func__);
4188
4189         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4190                 return -EAGAIN;
4191         if (nfs4_read_stateid_changed(task, &hdr->args))
4192                 return -EAGAIN;
4193         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4194                                     nfs4_read_done_cb(task, hdr);
4195 }
4196
4197 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4198                                  struct rpc_message *msg)
4199 {
4200         hdr->timestamp   = jiffies;
4201         hdr->pgio_done_cb = nfs4_read_done_cb;
4202         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4203         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4204 }
4205
4206 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4207                                       struct nfs_pgio_header *hdr)
4208 {
4209         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4210                         &hdr->args.seq_args,
4211                         &hdr->res.seq_res,
4212                         task))
4213                 return 0;
4214         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4215                                 hdr->args.lock_context,
4216                                 hdr->rw_ops->rw_mode) == -EIO)
4217                 return -EIO;
4218         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4219                 return -EIO;
4220         return 0;
4221 }
4222
4223 static int nfs4_write_done_cb(struct rpc_task *task,
4224                               struct nfs_pgio_header *hdr)
4225 {
4226         struct inode *inode = hdr->inode;
4227
4228         trace_nfs4_write(hdr, task->tk_status);
4229         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4230                                     hdr->args.context->state,
4231                                     NULL) == -EAGAIN) {
4232                 rpc_restart_call_prepare(task);
4233                 return -EAGAIN;
4234         }
4235         if (task->tk_status >= 0) {
4236                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4237                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4238         }
4239         return 0;
4240 }
4241
4242 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4243                 struct nfs_pgio_args *args)
4244 {
4245
4246         if (!nfs4_error_stateid_expired(task->tk_status) ||
4247                 nfs4_stateid_is_current(&args->stateid,
4248                                 args->context,
4249                                 args->lock_context,
4250                                 FMODE_WRITE))
4251                 return false;
4252         rpc_restart_call_prepare(task);
4253         return true;
4254 }
4255
4256 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4257 {
4258         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4259                 return -EAGAIN;
4260         if (nfs4_write_stateid_changed(task, &hdr->args))
4261                 return -EAGAIN;
4262         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4263                 nfs4_write_done_cb(task, hdr);
4264 }
4265
4266 static
4267 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4268 {
4269         /* Don't request attributes for pNFS or O_DIRECT writes */
4270         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4271                 return false;
4272         /* Otherwise, request attributes if and only if we don't hold
4273          * a delegation
4274          */
4275         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4276 }
4277
4278 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4279                                   struct rpc_message *msg)
4280 {
4281         struct nfs_server *server = NFS_SERVER(hdr->inode);
4282
4283         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4284                 hdr->args.bitmask = NULL;
4285                 hdr->res.fattr = NULL;
4286         } else
4287                 hdr->args.bitmask = server->cache_consistency_bitmask;
4288
4289         if (!hdr->pgio_done_cb)
4290                 hdr->pgio_done_cb = nfs4_write_done_cb;
4291         hdr->res.server = server;
4292         hdr->timestamp   = jiffies;
4293
4294         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4295         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4296 }
4297
4298 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4299 {
4300         nfs4_setup_sequence(NFS_SERVER(data->inode),
4301                         &data->args.seq_args,
4302                         &data->res.seq_res,
4303                         task);
4304 }
4305
4306 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4307 {
4308         struct inode *inode = data->inode;
4309
4310         trace_nfs4_commit(data, task->tk_status);
4311         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4312                                     NULL, NULL) == -EAGAIN) {
4313                 rpc_restart_call_prepare(task);
4314                 return -EAGAIN;
4315         }
4316         return 0;
4317 }
4318
4319 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4320 {
4321         if (!nfs4_sequence_done(task, &data->res.seq_res))
4322                 return -EAGAIN;
4323         return data->commit_done_cb(task, data);
4324 }
4325
4326 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4327 {
4328         struct nfs_server *server = NFS_SERVER(data->inode);
4329
4330         if (data->commit_done_cb == NULL)
4331                 data->commit_done_cb = nfs4_commit_done_cb;
4332         data->res.server = server;
4333         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4334         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4335 }
4336
4337 struct nfs4_renewdata {
4338         struct nfs_client       *client;
4339         unsigned long           timestamp;
4340 };
4341
4342 /*
4343  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4344  * standalone procedure for queueing an asynchronous RENEW.
4345  */
4346 static void nfs4_renew_release(void *calldata)
4347 {
4348         struct nfs4_renewdata *data = calldata;
4349         struct nfs_client *clp = data->client;
4350
4351         if (atomic_read(&clp->cl_count) > 1)
4352                 nfs4_schedule_state_renewal(clp);
4353         nfs_put_client(clp);
4354         kfree(data);
4355 }
4356
4357 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4358 {
4359         struct nfs4_renewdata *data = calldata;
4360         struct nfs_client *clp = data->client;
4361         unsigned long timestamp = data->timestamp;
4362
4363         trace_nfs4_renew_async(clp, task->tk_status);
4364         switch (task->tk_status) {
4365         case 0:
4366                 break;
4367         case -NFS4ERR_LEASE_MOVED:
4368                 nfs4_schedule_lease_moved_recovery(clp);
4369                 break;
4370         default:
4371                 /* Unless we're shutting down, schedule state recovery! */
4372                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4373                         return;
4374                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4375                         nfs4_schedule_lease_recovery(clp);
4376                         return;
4377                 }
4378                 nfs4_schedule_path_down_recovery(clp);
4379         }
4380         do_renew_lease(clp, timestamp);
4381 }
4382
4383 static const struct rpc_call_ops nfs4_renew_ops = {
4384         .rpc_call_done = nfs4_renew_done,
4385         .rpc_release = nfs4_renew_release,
4386 };
4387
4388 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4389 {
4390         struct rpc_message msg = {
4391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4392                 .rpc_argp       = clp,
4393                 .rpc_cred       = cred,
4394         };
4395         struct nfs4_renewdata *data;
4396
4397         if (renew_flags == 0)
4398                 return 0;
4399         if (!atomic_inc_not_zero(&clp->cl_count))
4400                 return -EIO;
4401         data = kmalloc(sizeof(*data), GFP_NOFS);
4402         if (data == NULL)
4403                 return -ENOMEM;
4404         data->client = clp;
4405         data->timestamp = jiffies;
4406         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4407                         &nfs4_renew_ops, data);
4408 }
4409
4410 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4411 {
4412         struct rpc_message msg = {
4413                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4414                 .rpc_argp       = clp,
4415                 .rpc_cred       = cred,
4416         };
4417         unsigned long now = jiffies;
4418         int status;
4419
4420         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4421         if (status < 0)
4422                 return status;
4423         do_renew_lease(clp, now);
4424         return 0;
4425 }
4426
4427 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4428 {
4429         return server->caps & NFS_CAP_ACLS;
4430 }
4431
4432 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4433  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4434  * the stack.
4435  */
4436 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4437
4438 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4439                 struct page **pages, unsigned int *pgbase)
4440 {
4441         struct page *newpage, **spages;
4442         int rc = 0;
4443         size_t len;
4444         spages = pages;
4445
4446         do {
4447                 len = min_t(size_t, PAGE_SIZE, buflen);
4448                 newpage = alloc_page(GFP_KERNEL);
4449
4450                 if (newpage == NULL)
4451                         goto unwind;
4452                 memcpy(page_address(newpage), buf, len);
4453                 buf += len;
4454                 buflen -= len;
4455                 *pages++ = newpage;
4456                 rc++;
4457         } while (buflen != 0);
4458
4459         return rc;
4460
4461 unwind:
4462         for(; rc > 0; rc--)
4463                 __free_page(spages[rc-1]);
4464         return -ENOMEM;
4465 }
4466
4467 struct nfs4_cached_acl {
4468         int cached;
4469         size_t len;
4470         char data[0];
4471 };
4472
4473 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4474 {
4475         struct nfs_inode *nfsi = NFS_I(inode);
4476
4477         spin_lock(&inode->i_lock);
4478         kfree(nfsi->nfs4_acl);
4479         nfsi->nfs4_acl = acl;
4480         spin_unlock(&inode->i_lock);
4481 }
4482
4483 static void nfs4_zap_acl_attr(struct inode *inode)
4484 {
4485         nfs4_set_cached_acl(inode, NULL);
4486 }
4487
4488 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4489 {
4490         struct nfs_inode *nfsi = NFS_I(inode);
4491         struct nfs4_cached_acl *acl;
4492         int ret = -ENOENT;
4493
4494         spin_lock(&inode->i_lock);
4495         acl = nfsi->nfs4_acl;
4496         if (acl == NULL)
4497                 goto out;
4498         if (buf == NULL) /* user is just asking for length */
4499                 goto out_len;
4500         if (acl->cached == 0)
4501                 goto out;
4502         ret = -ERANGE; /* see getxattr(2) man page */
4503         if (acl->len > buflen)
4504                 goto out;
4505         memcpy(buf, acl->data, acl->len);
4506 out_len:
4507         ret = acl->len;
4508 out:
4509         spin_unlock(&inode->i_lock);
4510         return ret;
4511 }
4512
4513 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4514 {
4515         struct nfs4_cached_acl *acl;
4516         size_t buflen = sizeof(*acl) + acl_len;
4517
4518         if (buflen <= PAGE_SIZE) {
4519                 acl = kmalloc(buflen, GFP_KERNEL);
4520                 if (acl == NULL)
4521                         goto out;
4522                 acl->cached = 1;
4523                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4524         } else {
4525                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4526                 if (acl == NULL)
4527                         goto out;
4528                 acl->cached = 0;
4529         }
4530         acl->len = acl_len;
4531 out:
4532         nfs4_set_cached_acl(inode, acl);
4533 }
4534
4535 /*
4536  * The getxattr API returns the required buffer length when called with a
4537  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4538  * the required buf.  On a NULL buf, we send a page of data to the server
4539  * guessing that the ACL request can be serviced by a page. If so, we cache
4540  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4541  * the cache. If not so, we throw away the page, and cache the required
4542  * length. The next getxattr call will then produce another round trip to
4543  * the server, this time with the input buf of the required size.
4544  */
4545 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4546 {
4547         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4548         struct nfs_getaclargs args = {
4549                 .fh = NFS_FH(inode),
4550                 .acl_pages = pages,
4551                 .acl_len = buflen,
4552         };
4553         struct nfs_getaclres res = {
4554                 .acl_len = buflen,
4555         };
4556         struct rpc_message msg = {
4557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4558                 .rpc_argp = &args,
4559                 .rpc_resp = &res,
4560         };
4561         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4562         int ret = -ENOMEM, i;
4563
4564         /* As long as we're doing a round trip to the server anyway,
4565          * let's be prepared for a page of acl data. */
4566         if (npages == 0)
4567                 npages = 1;
4568         if (npages > ARRAY_SIZE(pages))
4569                 return -ERANGE;
4570
4571         for (i = 0; i < npages; i++) {
4572                 pages[i] = alloc_page(GFP_KERNEL);
4573                 if (!pages[i])
4574                         goto out_free;
4575         }
4576
4577         /* for decoding across pages */
4578         res.acl_scratch = alloc_page(GFP_KERNEL);
4579         if (!res.acl_scratch)
4580                 goto out_free;
4581
4582         args.acl_len = npages * PAGE_SIZE;
4583         args.acl_pgbase = 0;
4584
4585         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4586                 __func__, buf, buflen, npages, args.acl_len);
4587         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4588                              &msg, &args.seq_args, &res.seq_res, 0);
4589         if (ret)
4590                 goto out_free;
4591
4592         /* Handle the case where the passed-in buffer is too short */
4593         if (res.acl_flags & NFS4_ACL_TRUNC) {
4594                 /* Did the user only issue a request for the acl length? */
4595                 if (buf == NULL)
4596                         goto out_ok;
4597                 ret = -ERANGE;
4598                 goto out_free;
4599         }
4600         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4601         if (buf) {
4602                 if (res.acl_len > buflen) {
4603                         ret = -ERANGE;
4604                         goto out_free;
4605                 }
4606                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4607         }
4608 out_ok:
4609         ret = res.acl_len;
4610 out_free:
4611         for (i = 0; i < npages; i++)
4612                 if (pages[i])
4613                         __free_page(pages[i]);
4614         if (res.acl_scratch)
4615                 __free_page(res.acl_scratch);
4616         return ret;
4617 }
4618
4619 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4620 {
4621         struct nfs4_exception exception = { };
4622         ssize_t ret;
4623         do {
4624                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4625                 trace_nfs4_get_acl(inode, ret);
4626                 if (ret >= 0)
4627                         break;
4628                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4629         } while (exception.retry);
4630         return ret;
4631 }
4632
4633 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4634 {
4635         struct nfs_server *server = NFS_SERVER(inode);
4636         int ret;
4637
4638         if (!nfs4_server_supports_acls(server))
4639                 return -EOPNOTSUPP;
4640         ret = nfs_revalidate_inode(server, inode);
4641         if (ret < 0)
4642                 return ret;
4643         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4644                 nfs_zap_acl_cache(inode);
4645         ret = nfs4_read_cached_acl(inode, buf, buflen);
4646         if (ret != -ENOENT)
4647                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4648                  * but no cached acl data, just the acl length */
4649                 return ret;
4650         return nfs4_get_acl_uncached(inode, buf, buflen);
4651 }
4652
4653 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4654 {
4655         struct nfs_server *server = NFS_SERVER(inode);
4656         struct page *pages[NFS4ACL_MAXPAGES];
4657         struct nfs_setaclargs arg = {
4658                 .fh             = NFS_FH(inode),
4659                 .acl_pages      = pages,
4660                 .acl_len        = buflen,
4661         };
4662         struct nfs_setaclres res;
4663         struct rpc_message msg = {
4664                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4665                 .rpc_argp       = &arg,
4666                 .rpc_resp       = &res,
4667         };
4668         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4669         int ret, i;
4670
4671         if (!nfs4_server_supports_acls(server))
4672                 return -EOPNOTSUPP;
4673         if (npages > ARRAY_SIZE(pages))
4674                 return -ERANGE;
4675         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4676         if (i < 0)
4677                 return i;
4678         nfs4_inode_return_delegation(inode);
4679         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4680
4681         /*
4682          * Free each page after tx, so the only ref left is
4683          * held by the network stack
4684          */
4685         for (; i > 0; i--)
4686                 put_page(pages[i-1]);
4687
4688         /*
4689          * Acl update can result in inode attribute update.
4690          * so mark the attribute cache invalid.
4691          */
4692         spin_lock(&inode->i_lock);
4693         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4694         spin_unlock(&inode->i_lock);
4695         nfs_access_zap_cache(inode);
4696         nfs_zap_acl_cache(inode);
4697         return ret;
4698 }
4699
4700 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4701 {
4702         struct nfs4_exception exception = { };
4703         int err;
4704         do {
4705                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4706                 trace_nfs4_set_acl(inode, err);
4707                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4708                                 &exception);
4709         } while (exception.retry);
4710         return err;
4711 }
4712
4713 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4714 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4715                                         size_t buflen)
4716 {
4717         struct nfs_server *server = NFS_SERVER(inode);
4718         struct nfs_fattr fattr;
4719         struct nfs4_label label = {0, 0, buflen, buf};
4720
4721         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4722         struct nfs4_getattr_arg arg = {
4723                 .fh             = NFS_FH(inode),
4724                 .bitmask        = bitmask,
4725         };
4726         struct nfs4_getattr_res res = {
4727                 .fattr          = &fattr,
4728                 .label          = &label,
4729                 .server         = server,
4730         };
4731         struct rpc_message msg = {
4732                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4733                 .rpc_argp       = &arg,
4734                 .rpc_resp       = &res,
4735         };
4736         int ret;
4737
4738         nfs_fattr_init(&fattr);
4739
4740         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4741         if (ret)
4742                 return ret;
4743         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4744                 return -ENOENT;
4745         if (buflen < label.len)
4746                 return -ERANGE;
4747         return 0;
4748 }
4749
4750 static int nfs4_get_security_label(struct inode *inode, void *buf,
4751                                         size_t buflen)
4752 {
4753         struct nfs4_exception exception = { };
4754         int err;
4755
4756         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4757                 return -EOPNOTSUPP;
4758
4759         do {
4760                 err = _nfs4_get_security_label(inode, buf, buflen);
4761                 trace_nfs4_get_security_label(inode, err);
4762                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4763                                 &exception);
4764         } while (exception.retry);
4765         return err;
4766 }
4767
4768 static int _nfs4_do_set_security_label(struct inode *inode,
4769                 struct nfs4_label *ilabel,
4770                 struct nfs_fattr *fattr,
4771                 struct nfs4_label *olabel)
4772 {
4773
4774         struct iattr sattr = {0};
4775         struct nfs_server *server = NFS_SERVER(inode);
4776         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4777         struct nfs_setattrargs arg = {
4778                 .fh             = NFS_FH(inode),
4779                 .iap            = &sattr,
4780                 .server         = server,
4781                 .bitmask        = bitmask,
4782                 .label          = ilabel,
4783         };
4784         struct nfs_setattrres res = {
4785                 .fattr          = fattr,
4786                 .label          = olabel,
4787                 .server         = server,
4788         };
4789         struct rpc_message msg = {
4790                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4791                 .rpc_argp       = &arg,
4792                 .rpc_resp       = &res,
4793         };
4794         int status;
4795
4796         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4797
4798         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4799         if (status)
4800                 dprintk("%s failed: %d\n", __func__, status);
4801
4802         return status;
4803 }
4804
4805 static int nfs4_do_set_security_label(struct inode *inode,
4806                 struct nfs4_label *ilabel,
4807                 struct nfs_fattr *fattr,
4808                 struct nfs4_label *olabel)
4809 {
4810         struct nfs4_exception exception = { };
4811         int err;
4812
4813         do {
4814                 err = _nfs4_do_set_security_label(inode, ilabel,
4815                                 fattr, olabel);
4816                 trace_nfs4_set_security_label(inode, err);
4817                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4818                                 &exception);
4819         } while (exception.retry);
4820         return err;
4821 }
4822
4823 static int
4824 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4825 {
4826         struct nfs4_label ilabel, *olabel = NULL;
4827         struct nfs_fattr fattr;
4828         struct rpc_cred *cred;
4829         struct inode *inode = dentry->d_inode;
4830         int status;
4831
4832         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4833                 return -EOPNOTSUPP;
4834
4835         nfs_fattr_init(&fattr);
4836
4837         ilabel.pi = 0;
4838         ilabel.lfs = 0;
4839         ilabel.label = (char *)buf;
4840         ilabel.len = buflen;
4841
4842         cred = rpc_lookup_cred();
4843         if (IS_ERR(cred))
4844                 return PTR_ERR(cred);
4845
4846         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4847         if (IS_ERR(olabel)) {
4848                 status = -PTR_ERR(olabel);
4849                 goto out;
4850         }
4851
4852         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4853         if (status == 0)
4854                 nfs_setsecurity(inode, &fattr, olabel);
4855
4856         nfs4_label_free(olabel);
4857 out:
4858         put_rpccred(cred);
4859         return status;
4860 }
4861 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4862
4863
4864 static int
4865 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4866                         struct nfs4_state *state, long *timeout)
4867 {
4868         struct nfs_client *clp = server->nfs_client;
4869
4870         if (task->tk_status >= 0)
4871                 return 0;
4872         switch(task->tk_status) {
4873                 case -NFS4ERR_DELEG_REVOKED:
4874                 case -NFS4ERR_ADMIN_REVOKED:
4875                 case -NFS4ERR_BAD_STATEID:
4876                 case -NFS4ERR_OPENMODE:
4877                         if (state == NULL)
4878                                 break;
4879                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4880                                 goto recovery_failed;
4881                         goto wait_on_recovery;
4882                 case -NFS4ERR_EXPIRED:
4883                         if (state != NULL) {
4884                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4885                                         goto recovery_failed;
4886                         }
4887                 case -NFS4ERR_STALE_STATEID:
4888                 case -NFS4ERR_STALE_CLIENTID:
4889                         nfs4_schedule_lease_recovery(clp);
4890                         goto wait_on_recovery;
4891                 case -NFS4ERR_MOVED:
4892                         if (nfs4_schedule_migration_recovery(server) < 0)
4893                                 goto recovery_failed;
4894                         goto wait_on_recovery;
4895                 case -NFS4ERR_LEASE_MOVED:
4896                         nfs4_schedule_lease_moved_recovery(clp);
4897                         goto wait_on_recovery;
4898 #if defined(CONFIG_NFS_V4_1)
4899                 case -NFS4ERR_BADSESSION:
4900                 case -NFS4ERR_BADSLOT:
4901                 case -NFS4ERR_BAD_HIGH_SLOT:
4902                 case -NFS4ERR_DEADSESSION:
4903                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4904                 case -NFS4ERR_SEQ_FALSE_RETRY:
4905                 case -NFS4ERR_SEQ_MISORDERED:
4906                         dprintk("%s ERROR %d, Reset session\n", __func__,
4907                                 task->tk_status);
4908                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4909                         goto wait_on_recovery;
4910 #endif /* CONFIG_NFS_V4_1 */
4911                 case -NFS4ERR_DELAY:
4912                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4913                         rpc_delay(task, nfs4_update_delay(timeout));
4914                         goto restart_call;
4915                 case -NFS4ERR_GRACE:
4916                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4917                 case -NFS4ERR_RETRY_UNCACHED_REP:
4918                 case -NFS4ERR_OLD_STATEID:
4919                         goto restart_call;
4920         }
4921         task->tk_status = nfs4_map_errors(task->tk_status);
4922         return 0;
4923 recovery_failed:
4924         task->tk_status = -EIO;
4925         return 0;
4926 wait_on_recovery:
4927         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4928         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4929                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4930         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4931                 goto recovery_failed;
4932 restart_call:
4933         task->tk_status = 0;
4934         return -EAGAIN;
4935 }
4936
4937 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4938                                     nfs4_verifier *bootverf)
4939 {
4940         __be32 verf[2];
4941
4942         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4943                 /* An impossible timestamp guarantees this value
4944                  * will never match a generated boot time. */
4945                 verf[0] = 0;
4946                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4947         } else {
4948                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4949                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4950                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4951         }
4952         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4953 }
4954
4955 static unsigned int
4956 nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4957                                    char *buf, size_t len)
4958 {
4959         unsigned int result;
4960
4961         if (clp->cl_owner_id != NULL)
4962                 return strlcpy(buf, clp->cl_owner_id, len);
4963
4964         rcu_read_lock();
4965         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4966                                 clp->cl_ipaddr,
4967                                 rpc_peeraddr2str(clp->cl_rpcclient,
4968                                                         RPC_DISPLAY_ADDR),
4969                                 rpc_peeraddr2str(clp->cl_rpcclient,
4970                                                         RPC_DISPLAY_PROTO));
4971         rcu_read_unlock();
4972         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4973         return result;
4974 }
4975
4976 static unsigned int
4977 nfs4_init_uniform_client_string(struct nfs_client *clp,
4978                                 char *buf, size_t len)
4979 {
4980         const char *nodename = clp->cl_rpcclient->cl_nodename;
4981         unsigned int result;
4982
4983         if (clp->cl_owner_id != NULL)
4984                 return strlcpy(buf, clp->cl_owner_id, len);
4985
4986         if (nfs4_client_id_uniquifier[0] != '\0')
4987                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4988                                 clp->rpc_ops->version,
4989                                 clp->cl_minorversion,
4990                                 nfs4_client_id_uniquifier,
4991                                 nodename);
4992         else
4993                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4994                                 clp->rpc_ops->version, clp->cl_minorversion,
4995                                 nodename);
4996         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4997         return result;
4998 }
4999
5000 /*
5001  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5002  * services.  Advertise one based on the address family of the
5003  * clientaddr.
5004  */
5005 static unsigned int
5006 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5007 {
5008         if (strchr(clp->cl_ipaddr, ':') != NULL)
5009                 return scnprintf(buf, len, "tcp6");
5010         else
5011                 return scnprintf(buf, len, "tcp");
5012 }
5013
5014 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5015 {
5016         struct nfs4_setclientid *sc = calldata;
5017
5018         if (task->tk_status == 0)
5019                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5020 }
5021
5022 static const struct rpc_call_ops nfs4_setclientid_ops = {
5023         .rpc_call_done = nfs4_setclientid_done,
5024 };
5025
5026 /**
5027  * nfs4_proc_setclientid - Negotiate client ID
5028  * @clp: state data structure
5029  * @program: RPC program for NFSv4 callback service
5030  * @port: IP port number for NFS4 callback service
5031  * @cred: RPC credential to use for this call
5032  * @res: where to place the result
5033  *
5034  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5035  */
5036 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5037                 unsigned short port, struct rpc_cred *cred,
5038                 struct nfs4_setclientid_res *res)
5039 {
5040         nfs4_verifier sc_verifier;
5041         struct nfs4_setclientid setclientid = {
5042                 .sc_verifier = &sc_verifier,
5043                 .sc_prog = program,
5044                 .sc_cb_ident = clp->cl_cb_ident,
5045         };
5046         struct rpc_message msg = {
5047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5048                 .rpc_argp = &setclientid,
5049                 .rpc_resp = res,
5050                 .rpc_cred = cred,
5051         };
5052         struct rpc_task *task;
5053         struct rpc_task_setup task_setup_data = {
5054                 .rpc_client = clp->cl_rpcclient,
5055                 .rpc_message = &msg,
5056                 .callback_ops = &nfs4_setclientid_ops,
5057                 .callback_data = &setclientid,
5058                 .flags = RPC_TASK_TIMEOUT,
5059         };
5060         int status;
5061
5062         /* nfs_client_id4 */
5063         nfs4_init_boot_verifier(clp, &sc_verifier);
5064         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5065                 setclientid.sc_name_len =
5066                                 nfs4_init_uniform_client_string(clp,
5067                                                 setclientid.sc_name,
5068                                                 sizeof(setclientid.sc_name));
5069         else
5070                 setclientid.sc_name_len =
5071                                 nfs4_init_nonuniform_client_string(clp,
5072                                                 setclientid.sc_name,
5073                                                 sizeof(setclientid.sc_name));
5074         /* cb_client4 */
5075         setclientid.sc_netid_len =
5076                                 nfs4_init_callback_netid(clp,
5077                                                 setclientid.sc_netid,
5078                                                 sizeof(setclientid.sc_netid));
5079         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5080                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5081                                 clp->cl_ipaddr, port >> 8, port & 255);
5082
5083         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5084                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5085                 setclientid.sc_name_len, setclientid.sc_name);
5086         task = rpc_run_task(&task_setup_data);
5087         if (IS_ERR(task)) {
5088                 status = PTR_ERR(task);
5089                 goto out;
5090         }
5091         status = task->tk_status;
5092         if (setclientid.sc_cred) {
5093                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5094                 put_rpccred(setclientid.sc_cred);
5095         }
5096         rpc_put_task(task);
5097 out:
5098         trace_nfs4_setclientid(clp, status);
5099         dprintk("NFS reply setclientid: %d\n", status);
5100         return status;
5101 }
5102
5103 /**
5104  * nfs4_proc_setclientid_confirm - Confirm client ID
5105  * @clp: state data structure
5106  * @res: result of a previous SETCLIENTID
5107  * @cred: RPC credential to use for this call
5108  *
5109  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5110  */
5111 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5112                 struct nfs4_setclientid_res *arg,
5113                 struct rpc_cred *cred)
5114 {
5115         struct rpc_message msg = {
5116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5117                 .rpc_argp = arg,
5118                 .rpc_cred = cred,
5119         };
5120         int status;
5121
5122         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5123                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5124                 clp->cl_clientid);
5125         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5126         trace_nfs4_setclientid_confirm(clp, status);
5127         dprintk("NFS reply setclientid_confirm: %d\n", status);
5128         return status;
5129 }
5130
5131 struct nfs4_delegreturndata {
5132         struct nfs4_delegreturnargs args;
5133         struct nfs4_delegreturnres res;
5134         struct nfs_fh fh;
5135         nfs4_stateid stateid;
5136         unsigned long timestamp;
5137         struct nfs_fattr fattr;
5138         int rpc_status;
5139         struct inode *inode;
5140         bool roc;
5141         u32 roc_barrier;
5142 };
5143
5144 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5145 {
5146         struct nfs4_delegreturndata *data = calldata;
5147
5148         if (!nfs4_sequence_done(task, &data->res.seq_res))
5149                 return;
5150
5151         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5152         switch (task->tk_status) {
5153         case 0:
5154                 renew_lease(data->res.server, data->timestamp);
5155         case -NFS4ERR_ADMIN_REVOKED:
5156         case -NFS4ERR_DELEG_REVOKED:
5157         case -NFS4ERR_BAD_STATEID:
5158         case -NFS4ERR_OLD_STATEID:
5159         case -NFS4ERR_STALE_STATEID:
5160         case -NFS4ERR_EXPIRED:
5161                 task->tk_status = 0;
5162                 if (data->roc)
5163                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5164                 break;
5165         default:
5166                 if (nfs4_async_handle_error(task, data->res.server,
5167                                             NULL, NULL) == -EAGAIN) {
5168                         rpc_restart_call_prepare(task);
5169                         return;
5170                 }
5171         }
5172         data->rpc_status = task->tk_status;
5173 }
5174
5175 static void nfs4_delegreturn_release(void *calldata)
5176 {
5177         struct nfs4_delegreturndata *data = calldata;
5178
5179         if (data->roc)
5180                 pnfs_roc_release(data->inode);
5181         kfree(calldata);
5182 }
5183
5184 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5185 {
5186         struct nfs4_delegreturndata *d_data;
5187
5188         d_data = (struct nfs4_delegreturndata *)data;
5189
5190         if (d_data->roc &&
5191             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5192                 return;
5193
5194         nfs4_setup_sequence(d_data->res.server,
5195                         &d_data->args.seq_args,
5196                         &d_data->res.seq_res,
5197                         task);
5198 }
5199
5200 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5201         .rpc_call_prepare = nfs4_delegreturn_prepare,
5202         .rpc_call_done = nfs4_delegreturn_done,
5203         .rpc_release = nfs4_delegreturn_release,
5204 };
5205
5206 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5207 {
5208         struct nfs4_delegreturndata *data;
5209         struct nfs_server *server = NFS_SERVER(inode);
5210         struct rpc_task *task;
5211         struct rpc_message msg = {
5212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5213                 .rpc_cred = cred,
5214         };
5215         struct rpc_task_setup task_setup_data = {
5216                 .rpc_client = server->client,
5217                 .rpc_message = &msg,
5218                 .callback_ops = &nfs4_delegreturn_ops,
5219                 .flags = RPC_TASK_ASYNC,
5220         };
5221         int status = 0;
5222
5223         data = kzalloc(sizeof(*data), GFP_NOFS);
5224         if (data == NULL)
5225                 return -ENOMEM;
5226         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5227         data->args.fhandle = &data->fh;
5228         data->args.stateid = &data->stateid;
5229         data->args.bitmask = server->cache_consistency_bitmask;
5230         nfs_copy_fh(&data->fh, NFS_FH(inode));
5231         nfs4_stateid_copy(&data->stateid, stateid);
5232         data->res.fattr = &data->fattr;
5233         data->res.server = server;
5234         nfs_fattr_init(data->res.fattr);
5235         data->timestamp = jiffies;
5236         data->rpc_status = 0;
5237         data->inode = inode;
5238         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5239                     pnfs_roc(inode) : false;
5240
5241         task_setup_data.callback_data = data;
5242         msg.rpc_argp = &data->args;
5243         msg.rpc_resp = &data->res;
5244         task = rpc_run_task(&task_setup_data);
5245         if (IS_ERR(task))
5246                 return PTR_ERR(task);
5247         if (!issync)
5248                 goto out;
5249         status = nfs4_wait_for_completion_rpc_task(task);
5250         if (status != 0)
5251                 goto out;
5252         status = data->rpc_status;
5253         if (status == 0)
5254                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5255         else
5256                 nfs_refresh_inode(inode, &data->fattr);
5257 out:
5258         rpc_put_task(task);
5259         return status;
5260 }
5261
5262 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5263 {
5264         struct nfs_server *server = NFS_SERVER(inode);
5265         struct nfs4_exception exception = { };
5266         int err;
5267         do {
5268                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5269                 trace_nfs4_delegreturn(inode, err);
5270                 switch (err) {
5271                         case -NFS4ERR_STALE_STATEID:
5272                         case -NFS4ERR_EXPIRED:
5273                         case 0:
5274                                 return 0;
5275                 }
5276                 err = nfs4_handle_exception(server, err, &exception);
5277         } while (exception.retry);
5278         return err;
5279 }
5280
5281 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5282 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5283
5284 /*
5285  * sleep, with exponential backoff, and retry the LOCK operation.
5286  */
5287 static unsigned long
5288 nfs4_set_lock_task_retry(unsigned long timeout)
5289 {
5290         freezable_schedule_timeout_killable_unsafe(timeout);
5291         timeout <<= 1;
5292         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5293                 return NFS4_LOCK_MAXTIMEOUT;
5294         return timeout;
5295 }
5296
5297 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5298 {
5299         struct inode *inode = state->inode;
5300         struct nfs_server *server = NFS_SERVER(inode);
5301         struct nfs_client *clp = server->nfs_client;
5302         struct nfs_lockt_args arg = {
5303                 .fh = NFS_FH(inode),
5304                 .fl = request,
5305         };
5306         struct nfs_lockt_res res = {
5307                 .denied = request,
5308         };
5309         struct rpc_message msg = {
5310                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5311                 .rpc_argp       = &arg,
5312                 .rpc_resp       = &res,
5313                 .rpc_cred       = state->owner->so_cred,
5314         };
5315         struct nfs4_lock_state *lsp;
5316         int status;
5317
5318         arg.lock_owner.clientid = clp->cl_clientid;
5319         status = nfs4_set_lock_state(state, request);
5320         if (status != 0)
5321                 goto out;
5322         lsp = request->fl_u.nfs4_fl.owner;
5323         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5324         arg.lock_owner.s_dev = server->s_dev;
5325         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5326         switch (status) {
5327                 case 0:
5328                         request->fl_type = F_UNLCK;
5329                         break;
5330                 case -NFS4ERR_DENIED:
5331                         status = 0;
5332         }
5333         request->fl_ops->fl_release_private(request);
5334         request->fl_ops = NULL;
5335 out:
5336         return status;
5337 }
5338
5339 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5340 {
5341         struct nfs4_exception exception = { };
5342         int err;
5343
5344         do {
5345                 err = _nfs4_proc_getlk(state, cmd, request);
5346                 trace_nfs4_get_lock(request, state, cmd, err);
5347                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5348                                 &exception);
5349         } while (exception.retry);
5350         return err;
5351 }
5352
5353 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5354 {
5355         int res = 0;
5356         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5357                 case FL_POSIX:
5358                         res = posix_lock_file_wait(file, fl);
5359                         break;
5360                 case FL_FLOCK:
5361                         res = flock_lock_file_wait(file, fl);
5362                         break;
5363                 default:
5364                         BUG();
5365         }
5366         return res;
5367 }
5368
5369 struct nfs4_unlockdata {
5370         struct nfs_locku_args arg;
5371         struct nfs_locku_res res;
5372         struct nfs4_lock_state *lsp;
5373         struct nfs_open_context *ctx;
5374         struct file_lock fl;
5375         const struct nfs_server *server;
5376         unsigned long timestamp;
5377 };
5378
5379 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5380                 struct nfs_open_context *ctx,
5381                 struct nfs4_lock_state *lsp,
5382                 struct nfs_seqid *seqid)
5383 {
5384         struct nfs4_unlockdata *p;
5385         struct inode *inode = lsp->ls_state->inode;
5386
5387         p = kzalloc(sizeof(*p), GFP_NOFS);
5388         if (p == NULL)
5389                 return NULL;
5390         p->arg.fh = NFS_FH(inode);
5391         p->arg.fl = &p->fl;
5392         p->arg.seqid = seqid;
5393         p->res.seqid = seqid;
5394         p->lsp = lsp;
5395         atomic_inc(&lsp->ls_count);
5396         /* Ensure we don't close file until we're done freeing locks! */
5397         p->ctx = get_nfs_open_context(ctx);
5398         memcpy(&p->fl, fl, sizeof(p->fl));
5399         p->server = NFS_SERVER(inode);
5400         return p;
5401 }
5402
5403 static void nfs4_locku_release_calldata(void *data)
5404 {
5405         struct nfs4_unlockdata *calldata = data;
5406         nfs_free_seqid(calldata->arg.seqid);
5407         nfs4_put_lock_state(calldata->lsp);
5408         put_nfs_open_context(calldata->ctx);
5409         kfree(calldata);
5410 }
5411
5412 static void nfs4_locku_done(struct rpc_task *task, void *data)
5413 {
5414         struct nfs4_unlockdata *calldata = data;
5415
5416         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5417                 return;
5418         switch (task->tk_status) {
5419                 case 0:
5420                         renew_lease(calldata->server, calldata->timestamp);
5421                         do_vfs_lock(calldata->fl.fl_file, &calldata->fl);
5422                         if (nfs4_update_lock_stateid(calldata->lsp,
5423                                         &calldata->res.stateid))
5424                                 break;
5425                 case -NFS4ERR_BAD_STATEID:
5426                 case -NFS4ERR_OLD_STATEID:
5427                 case -NFS4ERR_STALE_STATEID:
5428                 case -NFS4ERR_EXPIRED:
5429                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5430                                                 &calldata->lsp->ls_stateid))
5431                                 rpc_restart_call_prepare(task);
5432                         break;
5433                 default:
5434                         if (nfs4_async_handle_error(task, calldata->server,
5435                                                     NULL, NULL) == -EAGAIN)
5436                                 rpc_restart_call_prepare(task);
5437         }
5438         nfs_release_seqid(calldata->arg.seqid);
5439 }
5440
5441 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5442 {
5443         struct nfs4_unlockdata *calldata = data;
5444
5445         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5446                 goto out_wait;
5447         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5448         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5449                 /* Note: exit _without_ running nfs4_locku_done */
5450                 goto out_no_action;
5451         }
5452         calldata->timestamp = jiffies;
5453         if (nfs4_setup_sequence(calldata->server,
5454                                 &calldata->arg.seq_args,
5455                                 &calldata->res.seq_res,
5456                                 task) != 0)
5457                 nfs_release_seqid(calldata->arg.seqid);
5458         return;
5459 out_no_action:
5460         task->tk_action = NULL;
5461 out_wait:
5462         nfs4_sequence_done(task, &calldata->res.seq_res);
5463 }
5464
5465 static const struct rpc_call_ops nfs4_locku_ops = {
5466         .rpc_call_prepare = nfs4_locku_prepare,
5467         .rpc_call_done = nfs4_locku_done,
5468         .rpc_release = nfs4_locku_release_calldata,
5469 };
5470
5471 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5472                 struct nfs_open_context *ctx,
5473                 struct nfs4_lock_state *lsp,
5474                 struct nfs_seqid *seqid)
5475 {
5476         struct nfs4_unlockdata *data;
5477         struct rpc_message msg = {
5478                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5479                 .rpc_cred = ctx->cred,
5480         };
5481         struct rpc_task_setup task_setup_data = {
5482                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5483                 .rpc_message = &msg,
5484                 .callback_ops = &nfs4_locku_ops,
5485                 .workqueue = nfsiod_workqueue,
5486                 .flags = RPC_TASK_ASYNC,
5487         };
5488
5489         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5490                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5491
5492         /* Ensure this is an unlock - when canceling a lock, the
5493          * canceled lock is passed in, and it won't be an unlock.
5494          */
5495         fl->fl_type = F_UNLCK;
5496
5497         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5498         if (data == NULL) {
5499                 nfs_free_seqid(seqid);
5500                 return ERR_PTR(-ENOMEM);
5501         }
5502
5503         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5504         msg.rpc_argp = &data->arg;
5505         msg.rpc_resp = &data->res;
5506         task_setup_data.callback_data = data;
5507         return rpc_run_task(&task_setup_data);
5508 }
5509
5510 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5511 {
5512         struct inode *inode = state->inode;
5513         struct nfs4_state_owner *sp = state->owner;
5514         struct nfs_inode *nfsi = NFS_I(inode);
5515         struct nfs_seqid *seqid;
5516         struct nfs4_lock_state *lsp;
5517         struct rpc_task *task;
5518         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5519         int status = 0;
5520         unsigned char fl_flags = request->fl_flags;
5521
5522         status = nfs4_set_lock_state(state, request);
5523         /* Unlock _before_ we do the RPC call */
5524         request->fl_flags |= FL_EXISTS;
5525         /* Exclude nfs_delegation_claim_locks() */
5526         mutex_lock(&sp->so_delegreturn_mutex);
5527         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5528         down_read(&nfsi->rwsem);
5529         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5530                 up_read(&nfsi->rwsem);
5531                 mutex_unlock(&sp->so_delegreturn_mutex);
5532                 goto out;
5533         }
5534         up_read(&nfsi->rwsem);
5535         mutex_unlock(&sp->so_delegreturn_mutex);
5536         if (status != 0)
5537                 goto out;
5538         /* Is this a delegated lock? */
5539         lsp = request->fl_u.nfs4_fl.owner;
5540         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5541                 goto out;
5542         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5543         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5544         status = -ENOMEM;
5545         if (IS_ERR(seqid))
5546                 goto out;
5547         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5548         status = PTR_ERR(task);
5549         if (IS_ERR(task))
5550                 goto out;
5551         status = nfs4_wait_for_completion_rpc_task(task);
5552         rpc_put_task(task);
5553 out:
5554         request->fl_flags = fl_flags;
5555         trace_nfs4_unlock(request, state, F_SETLK, status);
5556         return status;
5557 }
5558
5559 struct nfs4_lockdata {
5560         struct nfs_lock_args arg;
5561         struct nfs_lock_res res;
5562         struct nfs4_lock_state *lsp;
5563         struct nfs_open_context *ctx;
5564         struct file_lock fl;
5565         unsigned long timestamp;
5566         int rpc_status;
5567         int cancelled;
5568         struct nfs_server *server;
5569 };
5570
5571 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5572                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5573                 gfp_t gfp_mask)
5574 {
5575         struct nfs4_lockdata *p;
5576         struct inode *inode = lsp->ls_state->inode;
5577         struct nfs_server *server = NFS_SERVER(inode);
5578         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5579
5580         p = kzalloc(sizeof(*p), gfp_mask);
5581         if (p == NULL)
5582                 return NULL;
5583
5584         p->arg.fh = NFS_FH(inode);
5585         p->arg.fl = &p->fl;
5586         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5587         if (IS_ERR(p->arg.open_seqid))
5588                 goto out_free;
5589         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5590         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5591         if (IS_ERR(p->arg.lock_seqid))
5592                 goto out_free_seqid;
5593         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5594         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5595         p->arg.lock_owner.s_dev = server->s_dev;
5596         p->res.lock_seqid = p->arg.lock_seqid;
5597         p->lsp = lsp;
5598         p->server = server;
5599         atomic_inc(&lsp->ls_count);
5600         p->ctx = get_nfs_open_context(ctx);
5601         memcpy(&p->fl, fl, sizeof(p->fl));
5602         return p;
5603 out_free_seqid:
5604         nfs_free_seqid(p->arg.open_seqid);
5605 out_free:
5606         kfree(p);
5607         return NULL;
5608 }
5609
5610 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5611 {
5612         struct nfs4_lockdata *data = calldata;
5613         struct nfs4_state *state = data->lsp->ls_state;
5614
5615         dprintk("%s: begin!\n", __func__);
5616         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5617                 goto out_wait;
5618         /* Do we need to do an open_to_lock_owner? */
5619         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5620                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5621                         goto out_release_lock_seqid;
5622                 }
5623                 nfs4_stateid_copy(&data->arg.open_stateid,
5624                                 &state->open_stateid);
5625                 data->arg.new_lock_owner = 1;
5626                 data->res.open_seqid = data->arg.open_seqid;
5627         } else {
5628                 data->arg.new_lock_owner = 0;
5629                 nfs4_stateid_copy(&data->arg.lock_stateid,
5630                                 &data->lsp->ls_stateid);
5631         }
5632         if (!nfs4_valid_open_stateid(state)) {
5633                 data->rpc_status = -EBADF;
5634                 task->tk_action = NULL;
5635                 goto out_release_open_seqid;
5636         }
5637         data->timestamp = jiffies;
5638         if (nfs4_setup_sequence(data->server,
5639                                 &data->arg.seq_args,
5640                                 &data->res.seq_res,
5641                                 task) == 0)
5642                 return;
5643 out_release_open_seqid:
5644         nfs_release_seqid(data->arg.open_seqid);
5645 out_release_lock_seqid:
5646         nfs_release_seqid(data->arg.lock_seqid);
5647 out_wait:
5648         nfs4_sequence_done(task, &data->res.seq_res);
5649         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5650 }
5651
5652 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5653 {
5654         struct nfs4_lockdata *data = calldata;
5655         struct nfs4_lock_state *lsp = data->lsp;
5656
5657         dprintk("%s: begin!\n", __func__);
5658
5659         if (!nfs4_sequence_done(task, &data->res.seq_res))
5660                 return;
5661
5662         data->rpc_status = task->tk_status;
5663         switch (task->tk_status) {
5664         case 0:
5665                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode),
5666                                 data->timestamp);
5667                 if (data->arg.new_lock) {
5668                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5669                         if (do_vfs_lock(data->fl.fl_file, &data->fl) < 0) {
5670                                 rpc_restart_call_prepare(task);
5671                                 break;
5672                         }
5673                 }
5674                 if (data->arg.new_lock_owner != 0) {
5675                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5676                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5677                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5678                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5679                         rpc_restart_call_prepare(task);
5680                 break;
5681         case -NFS4ERR_BAD_STATEID:
5682         case -NFS4ERR_OLD_STATEID:
5683         case -NFS4ERR_STALE_STATEID:
5684         case -NFS4ERR_EXPIRED:
5685                 if (data->arg.new_lock_owner != 0) {
5686                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5687                                                 &lsp->ls_state->open_stateid))
5688                                 rpc_restart_call_prepare(task);
5689                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5690                                                 &lsp->ls_stateid))
5691                                 rpc_restart_call_prepare(task);
5692         }
5693         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5694 }
5695
5696 static void nfs4_lock_release(void *calldata)
5697 {
5698         struct nfs4_lockdata *data = calldata;
5699
5700         dprintk("%s: begin!\n", __func__);
5701         nfs_free_seqid(data->arg.open_seqid);
5702         if (data->cancelled != 0) {
5703                 struct rpc_task *task;
5704                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5705                                 data->arg.lock_seqid);
5706                 if (!IS_ERR(task))
5707                         rpc_put_task_async(task);
5708                 dprintk("%s: cancelling lock!\n", __func__);
5709         } else
5710                 nfs_free_seqid(data->arg.lock_seqid);
5711         nfs4_put_lock_state(data->lsp);
5712         put_nfs_open_context(data->ctx);
5713         kfree(data);
5714         dprintk("%s: done!\n", __func__);
5715 }
5716
5717 static const struct rpc_call_ops nfs4_lock_ops = {
5718         .rpc_call_prepare = nfs4_lock_prepare,
5719         .rpc_call_done = nfs4_lock_done,
5720         .rpc_release = nfs4_lock_release,
5721 };
5722
5723 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5724 {
5725         switch (error) {
5726         case -NFS4ERR_ADMIN_REVOKED:
5727         case -NFS4ERR_BAD_STATEID:
5728                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5729                 if (new_lock_owner != 0 ||
5730                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5731                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5732                 break;
5733         case -NFS4ERR_STALE_STATEID:
5734                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5735         case -NFS4ERR_EXPIRED:
5736                 nfs4_schedule_lease_recovery(server->nfs_client);
5737         };
5738 }
5739
5740 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5741 {
5742         struct nfs4_lockdata *data;
5743         struct rpc_task *task;
5744         struct rpc_message msg = {
5745                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5746                 .rpc_cred = state->owner->so_cred,
5747         };
5748         struct rpc_task_setup task_setup_data = {
5749                 .rpc_client = NFS_CLIENT(state->inode),
5750                 .rpc_message = &msg,
5751                 .callback_ops = &nfs4_lock_ops,
5752                 .workqueue = nfsiod_workqueue,
5753                 .flags = RPC_TASK_ASYNC,
5754         };
5755         int ret;
5756
5757         dprintk("%s: begin!\n", __func__);
5758         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5759                         fl->fl_u.nfs4_fl.owner,
5760                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5761         if (data == NULL)
5762                 return -ENOMEM;
5763         if (IS_SETLKW(cmd))
5764                 data->arg.block = 1;
5765         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5766         msg.rpc_argp = &data->arg;
5767         msg.rpc_resp = &data->res;
5768         task_setup_data.callback_data = data;
5769         if (recovery_type > NFS_LOCK_NEW) {
5770                 if (recovery_type == NFS_LOCK_RECLAIM)
5771                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5772                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5773         } else
5774                 data->arg.new_lock = 1;
5775         task = rpc_run_task(&task_setup_data);
5776         if (IS_ERR(task))
5777                 return PTR_ERR(task);
5778         ret = nfs4_wait_for_completion_rpc_task(task);
5779         if (ret == 0) {
5780                 ret = data->rpc_status;
5781                 if (ret)
5782                         nfs4_handle_setlk_error(data->server, data->lsp,
5783                                         data->arg.new_lock_owner, ret);
5784         } else
5785                 data->cancelled = 1;
5786         rpc_put_task(task);
5787         dprintk("%s: done, ret = %d!\n", __func__, ret);
5788         return ret;
5789 }
5790
5791 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5792 {
5793         struct nfs_server *server = NFS_SERVER(state->inode);
5794         struct nfs4_exception exception = {
5795                 .inode = state->inode,
5796         };
5797         int err;
5798
5799         do {
5800                 /* Cache the lock if possible... */
5801                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5802                         return 0;
5803                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5804                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5805                 if (err != -NFS4ERR_DELAY)
5806                         break;
5807                 nfs4_handle_exception(server, err, &exception);
5808         } while (exception.retry);
5809         return err;
5810 }
5811
5812 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5813 {
5814         struct nfs_server *server = NFS_SERVER(state->inode);
5815         struct nfs4_exception exception = {
5816                 .inode = state->inode,
5817         };
5818         int err;
5819
5820         err = nfs4_set_lock_state(state, request);
5821         if (err != 0)
5822                 return err;
5823         if (!recover_lost_locks) {
5824                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5825                 return 0;
5826         }
5827         do {
5828                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5829                         return 0;
5830                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5831                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5832                 switch (err) {
5833                 default:
5834                         goto out;
5835                 case -NFS4ERR_GRACE:
5836                 case -NFS4ERR_DELAY:
5837                         nfs4_handle_exception(server, err, &exception);
5838                         err = 0;
5839                 }
5840         } while (exception.retry);
5841 out:
5842         return err;
5843 }
5844
5845 #if defined(CONFIG_NFS_V4_1)
5846 /**
5847  * nfs41_check_expired_locks - possibly free a lock stateid
5848  *
5849  * @state: NFSv4 state for an inode
5850  *
5851  * Returns NFS_OK if recovery for this stateid is now finished.
5852  * Otherwise a negative NFS4ERR value is returned.
5853  */
5854 static int nfs41_check_expired_locks(struct nfs4_state *state)
5855 {
5856         int status, ret = -NFS4ERR_BAD_STATEID;
5857         struct nfs4_lock_state *lsp;
5858         struct nfs_server *server = NFS_SERVER(state->inode);
5859
5860         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5861                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5862                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5863
5864                         status = nfs41_test_stateid(server,
5865                                         &lsp->ls_stateid,
5866                                         cred);
5867                         trace_nfs4_test_lock_stateid(state, lsp, status);
5868                         if (status != NFS_OK) {
5869                                 /* Free the stateid unless the server
5870                                  * informs us the stateid is unrecognized. */
5871                                 if (status != -NFS4ERR_BAD_STATEID)
5872                                         nfs41_free_stateid(server,
5873                                                         &lsp->ls_stateid,
5874                                                         cred);
5875                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5876                                 ret = status;
5877                         }
5878                 }
5879         };
5880
5881         return ret;
5882 }
5883
5884 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5885 {
5886         int status = NFS_OK;
5887
5888         if (test_bit(LK_STATE_IN_USE, &state->flags))
5889                 status = nfs41_check_expired_locks(state);
5890         if (status != NFS_OK)
5891                 status = nfs4_lock_expired(state, request);
5892         return status;
5893 }
5894 #endif
5895
5896 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5897 {
5898         struct nfs_inode *nfsi = NFS_I(state->inode);
5899         unsigned char fl_flags = request->fl_flags;
5900         int status = -ENOLCK;
5901
5902         if ((fl_flags & FL_POSIX) &&
5903                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5904                 goto out;
5905         /* Is this a delegated open? */
5906         status = nfs4_set_lock_state(state, request);
5907         if (status != 0)
5908                 goto out;
5909         request->fl_flags |= FL_ACCESS;
5910         status = do_vfs_lock(request->fl_file, request);
5911         if (status < 0)
5912                 goto out;
5913         down_read(&nfsi->rwsem);
5914         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5915                 /* Yes: cache locks! */
5916                 /* ...but avoid races with delegation recall... */
5917                 request->fl_flags = fl_flags & ~FL_SLEEP;
5918                 status = do_vfs_lock(request->fl_file, request);
5919                 up_read(&nfsi->rwsem);
5920                 goto out;
5921         }
5922         up_read(&nfsi->rwsem);
5923         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5924 out:
5925         request->fl_flags = fl_flags;
5926         return status;
5927 }
5928
5929 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5930 {
5931         struct nfs4_exception exception = {
5932                 .state = state,
5933                 .inode = state->inode,
5934         };
5935         int err;
5936
5937         do {
5938                 err = _nfs4_proc_setlk(state, cmd, request);
5939                 trace_nfs4_set_lock(request, state, cmd, err);
5940                 if (err == -NFS4ERR_DENIED)
5941                         err = -EAGAIN;
5942                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5943                                 err, &exception);
5944         } while (exception.retry);
5945         return err;
5946 }
5947
5948 static int
5949 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5950 {
5951         struct nfs_open_context *ctx;
5952         struct nfs4_state *state;
5953         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5954         int status;
5955
5956         /* verify open state */
5957         ctx = nfs_file_open_context(filp);
5958         state = ctx->state;
5959
5960         if (request->fl_start < 0 || request->fl_end < 0)
5961                 return -EINVAL;
5962
5963         if (IS_GETLK(cmd)) {
5964                 if (state != NULL)
5965                         return nfs4_proc_getlk(state, F_GETLK, request);
5966                 return 0;
5967         }
5968
5969         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5970                 return -EINVAL;
5971
5972         if (request->fl_type == F_UNLCK) {
5973                 if (state != NULL)
5974                         return nfs4_proc_unlck(state, cmd, request);
5975                 return 0;
5976         }
5977
5978         if (state == NULL)
5979                 return -ENOLCK;
5980         /*
5981          * Don't rely on the VFS having checked the file open mode,
5982          * since it won't do this for flock() locks.
5983          */
5984         switch (request->fl_type) {
5985         case F_RDLCK:
5986                 if (!(filp->f_mode & FMODE_READ))
5987                         return -EBADF;
5988                 break;
5989         case F_WRLCK:
5990                 if (!(filp->f_mode & FMODE_WRITE))
5991                         return -EBADF;
5992         }
5993
5994         do {
5995                 status = nfs4_proc_setlk(state, cmd, request);
5996                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5997                         break;
5998                 timeout = nfs4_set_lock_task_retry(timeout);
5999                 status = -ERESTARTSYS;
6000                 if (signalled())
6001                         break;
6002         } while(status < 0);
6003         return status;
6004 }
6005
6006 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6007 {
6008         struct nfs_server *server = NFS_SERVER(state->inode);
6009         int err;
6010
6011         err = nfs4_set_lock_state(state, fl);
6012         if (err != 0)
6013                 return err;
6014         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6015         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6016 }
6017
6018 struct nfs_release_lockowner_data {
6019         struct nfs4_lock_state *lsp;
6020         struct nfs_server *server;
6021         struct nfs_release_lockowner_args args;
6022         struct nfs_release_lockowner_res res;
6023         unsigned long timestamp;
6024 };
6025
6026 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6027 {
6028         struct nfs_release_lockowner_data *data = calldata;
6029         struct nfs_server *server = data->server;
6030         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6031                              &data->args.seq_args, &data->res.seq_res, task);
6032         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6033         data->timestamp = jiffies;
6034 }
6035
6036 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6037 {
6038         struct nfs_release_lockowner_data *data = calldata;
6039         struct nfs_server *server = data->server;
6040
6041         nfs40_sequence_done(task, &data->res.seq_res);
6042
6043         switch (task->tk_status) {
6044         case 0:
6045                 renew_lease(server, data->timestamp);
6046                 break;
6047         case -NFS4ERR_STALE_CLIENTID:
6048         case -NFS4ERR_EXPIRED:
6049                 nfs4_schedule_lease_recovery(server->nfs_client);
6050                 break;
6051         case -NFS4ERR_LEASE_MOVED:
6052         case -NFS4ERR_DELAY:
6053                 if (nfs4_async_handle_error(task, server,
6054                                             NULL, NULL) == -EAGAIN)
6055                         rpc_restart_call_prepare(task);
6056         }
6057 }
6058
6059 static void nfs4_release_lockowner_release(void *calldata)
6060 {
6061         struct nfs_release_lockowner_data *data = calldata;
6062         nfs4_free_lock_state(data->server, data->lsp);
6063         kfree(calldata);
6064 }
6065
6066 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6067         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6068         .rpc_call_done = nfs4_release_lockowner_done,
6069         .rpc_release = nfs4_release_lockowner_release,
6070 };
6071
6072 static void
6073 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6074 {
6075         struct nfs_release_lockowner_data *data;
6076         struct rpc_message msg = {
6077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6078         };
6079
6080         if (server->nfs_client->cl_mvops->minor_version != 0)
6081                 return;
6082
6083         data = kmalloc(sizeof(*data), GFP_NOFS);
6084         if (!data)
6085                 return;
6086         data->lsp = lsp;
6087         data->server = server;
6088         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6089         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6090         data->args.lock_owner.s_dev = server->s_dev;
6091
6092         msg.rpc_argp = &data->args;
6093         msg.rpc_resp = &data->res;
6094         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6095         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6096 }
6097
6098 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6099
6100 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6101                                    const void *buf, size_t buflen,
6102                                    int flags, int type)
6103 {
6104         if (strcmp(key, "") != 0)
6105                 return -EINVAL;
6106
6107         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6108 }
6109
6110 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6111                                    void *buf, size_t buflen, int type)
6112 {
6113         if (strcmp(key, "") != 0)
6114                 return -EINVAL;
6115
6116         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6117 }
6118
6119 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6120                                        size_t list_len, const char *name,
6121                                        size_t name_len, int type)
6122 {
6123         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6124
6125         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6126                 return 0;
6127
6128         if (list && len <= list_len)
6129                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6130         return len;
6131 }
6132
6133 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6134 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6135 {
6136         return server->caps & NFS_CAP_SECURITY_LABEL;
6137 }
6138
6139 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6140                                    const void *buf, size_t buflen,
6141                                    int flags, int type)
6142 {
6143         if (security_ismaclabel(key))
6144                 return nfs4_set_security_label(dentry, buf, buflen);
6145
6146         return -EOPNOTSUPP;
6147 }
6148
6149 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6150                                    void *buf, size_t buflen, int type)
6151 {
6152         if (security_ismaclabel(key))
6153                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6154         return -EOPNOTSUPP;
6155 }
6156
6157 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6158                                        size_t list_len, const char *name,
6159                                        size_t name_len, int type)
6160 {
6161         size_t len = 0;
6162
6163         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6164                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6165                 if (list && len <= list_len)
6166                         security_inode_listsecurity(dentry->d_inode, list, len);
6167         }
6168         return len;
6169 }
6170
6171 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6172         .prefix = XATTR_SECURITY_PREFIX,
6173         .list   = nfs4_xattr_list_nfs4_label,
6174         .get    = nfs4_xattr_get_nfs4_label,
6175         .set    = nfs4_xattr_set_nfs4_label,
6176 };
6177 #endif
6178
6179
6180 /*
6181  * nfs_fhget will use either the mounted_on_fileid or the fileid
6182  */
6183 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6184 {
6185         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6186                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6187               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6188               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6189                 return;
6190
6191         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6192                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6193         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6194         fattr->nlink = 2;
6195 }
6196
6197 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6198                                    const struct qstr *name,
6199                                    struct nfs4_fs_locations *fs_locations,
6200                                    struct page *page)
6201 {
6202         struct nfs_server *server = NFS_SERVER(dir);
6203         u32 bitmask[3] = {
6204                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6205         };
6206         struct nfs4_fs_locations_arg args = {
6207                 .dir_fh = NFS_FH(dir),
6208                 .name = name,
6209                 .page = page,
6210                 .bitmask = bitmask,
6211         };
6212         struct nfs4_fs_locations_res res = {
6213                 .fs_locations = fs_locations,
6214         };
6215         struct rpc_message msg = {
6216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6217                 .rpc_argp = &args,
6218                 .rpc_resp = &res,
6219         };
6220         int status;
6221
6222         dprintk("%s: start\n", __func__);
6223
6224         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6225          * is not supported */
6226         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6227                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6228         else
6229                 bitmask[0] |= FATTR4_WORD0_FILEID;
6230
6231         nfs_fattr_init(&fs_locations->fattr);
6232         fs_locations->server = server;
6233         fs_locations->nlocations = 0;
6234         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6235         dprintk("%s: returned status = %d\n", __func__, status);
6236         return status;
6237 }
6238
6239 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6240                            const struct qstr *name,
6241                            struct nfs4_fs_locations *fs_locations,
6242                            struct page *page)
6243 {
6244         struct nfs4_exception exception = { };
6245         int err;
6246         do {
6247                 err = _nfs4_proc_fs_locations(client, dir, name,
6248                                 fs_locations, page);
6249                 trace_nfs4_get_fs_locations(dir, name, err);
6250                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6251                                 &exception);
6252         } while (exception.retry);
6253         return err;
6254 }
6255
6256 /*
6257  * This operation also signals the server that this client is
6258  * performing migration recovery.  The server can stop returning
6259  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6260  * appended to this compound to identify the client ID which is
6261  * performing recovery.
6262  */
6263 static int _nfs40_proc_get_locations(struct inode *inode,
6264                                      struct nfs4_fs_locations *locations,
6265                                      struct page *page, struct rpc_cred *cred)
6266 {
6267         struct nfs_server *server = NFS_SERVER(inode);
6268         struct rpc_clnt *clnt = server->client;
6269         u32 bitmask[2] = {
6270                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6271         };
6272         struct nfs4_fs_locations_arg args = {
6273                 .clientid       = server->nfs_client->cl_clientid,
6274                 .fh             = NFS_FH(inode),
6275                 .page           = page,
6276                 .bitmask        = bitmask,
6277                 .migration      = 1,            /* skip LOOKUP */
6278                 .renew          = 1,            /* append RENEW */
6279         };
6280         struct nfs4_fs_locations_res res = {
6281                 .fs_locations   = locations,
6282                 .migration      = 1,
6283                 .renew          = 1,
6284         };
6285         struct rpc_message msg = {
6286                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6287                 .rpc_argp       = &args,
6288                 .rpc_resp       = &res,
6289                 .rpc_cred       = cred,
6290         };
6291         unsigned long now = jiffies;
6292         int status;
6293
6294         nfs_fattr_init(&locations->fattr);
6295         locations->server = server;
6296         locations->nlocations = 0;
6297
6298         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6299         nfs4_set_sequence_privileged(&args.seq_args);
6300         status = nfs4_call_sync_sequence(clnt, server, &msg,
6301                                         &args.seq_args, &res.seq_res);
6302         if (status)
6303                 return status;
6304
6305         renew_lease(server, now);
6306         return 0;
6307 }
6308
6309 #ifdef CONFIG_NFS_V4_1
6310
6311 /*
6312  * This operation also signals the server that this client is
6313  * performing migration recovery.  The server can stop asserting
6314  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6315  * performing this operation is identified in the SEQUENCE
6316  * operation in this compound.
6317  *
6318  * When the client supports GETATTR(fs_locations_info), it can
6319  * be plumbed in here.
6320  */
6321 static int _nfs41_proc_get_locations(struct inode *inode,
6322                                      struct nfs4_fs_locations *locations,
6323                                      struct page *page, struct rpc_cred *cred)
6324 {
6325         struct nfs_server *server = NFS_SERVER(inode);
6326         struct rpc_clnt *clnt = server->client;
6327         u32 bitmask[2] = {
6328                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6329         };
6330         struct nfs4_fs_locations_arg args = {
6331                 .fh             = NFS_FH(inode),
6332                 .page           = page,
6333                 .bitmask        = bitmask,
6334                 .migration      = 1,            /* skip LOOKUP */
6335         };
6336         struct nfs4_fs_locations_res res = {
6337                 .fs_locations   = locations,
6338                 .migration      = 1,
6339         };
6340         struct rpc_message msg = {
6341                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6342                 .rpc_argp       = &args,
6343                 .rpc_resp       = &res,
6344                 .rpc_cred       = cred,
6345         };
6346         int status;
6347
6348         nfs_fattr_init(&locations->fattr);
6349         locations->server = server;
6350         locations->nlocations = 0;
6351
6352         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6353         nfs4_set_sequence_privileged(&args.seq_args);
6354         status = nfs4_call_sync_sequence(clnt, server, &msg,
6355                                         &args.seq_args, &res.seq_res);
6356         if (status == NFS4_OK &&
6357             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6358                 status = -NFS4ERR_LEASE_MOVED;
6359         return status;
6360 }
6361
6362 #endif  /* CONFIG_NFS_V4_1 */
6363
6364 /**
6365  * nfs4_proc_get_locations - discover locations for a migrated FSID
6366  * @inode: inode on FSID that is migrating
6367  * @locations: result of query
6368  * @page: buffer
6369  * @cred: credential to use for this operation
6370  *
6371  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6372  * operation failed, or a negative errno if a local error occurred.
6373  *
6374  * On success, "locations" is filled in, but if the server has
6375  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6376  * asserted.
6377  *
6378  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6379  * from this client that require migration recovery.
6380  */
6381 int nfs4_proc_get_locations(struct inode *inode,
6382                             struct nfs4_fs_locations *locations,
6383                             struct page *page, struct rpc_cred *cred)
6384 {
6385         struct nfs_server *server = NFS_SERVER(inode);
6386         struct nfs_client *clp = server->nfs_client;
6387         const struct nfs4_mig_recovery_ops *ops =
6388                                         clp->cl_mvops->mig_recovery_ops;
6389         struct nfs4_exception exception = { };
6390         int status;
6391
6392         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6393                 (unsigned long long)server->fsid.major,
6394                 (unsigned long long)server->fsid.minor,
6395                 clp->cl_hostname);
6396         nfs_display_fhandle(NFS_FH(inode), __func__);
6397
6398         do {
6399                 status = ops->get_locations(inode, locations, page, cred);
6400                 if (status != -NFS4ERR_DELAY)
6401                         break;
6402                 nfs4_handle_exception(server, status, &exception);
6403         } while (exception.retry);
6404         return status;
6405 }
6406
6407 /*
6408  * This operation also signals the server that this client is
6409  * performing "lease moved" recovery.  The server can stop
6410  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6411  * is appended to this compound to identify the client ID which is
6412  * performing recovery.
6413  */
6414 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6415 {
6416         struct nfs_server *server = NFS_SERVER(inode);
6417         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6418         struct rpc_clnt *clnt = server->client;
6419         struct nfs4_fsid_present_arg args = {
6420                 .fh             = NFS_FH(inode),
6421                 .clientid       = clp->cl_clientid,
6422                 .renew          = 1,            /* append RENEW */
6423         };
6424         struct nfs4_fsid_present_res res = {
6425                 .renew          = 1,
6426         };
6427         struct rpc_message msg = {
6428                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6429                 .rpc_argp       = &args,
6430                 .rpc_resp       = &res,
6431                 .rpc_cred       = cred,
6432         };
6433         unsigned long now = jiffies;
6434         int status;
6435
6436         res.fh = nfs_alloc_fhandle();
6437         if (res.fh == NULL)
6438                 return -ENOMEM;
6439
6440         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6441         nfs4_set_sequence_privileged(&args.seq_args);
6442         status = nfs4_call_sync_sequence(clnt, server, &msg,
6443                                                 &args.seq_args, &res.seq_res);
6444         nfs_free_fhandle(res.fh);
6445         if (status)
6446                 return status;
6447
6448         do_renew_lease(clp, now);
6449         return 0;
6450 }
6451
6452 #ifdef CONFIG_NFS_V4_1
6453
6454 /*
6455  * This operation also signals the server that this client is
6456  * performing "lease moved" recovery.  The server can stop asserting
6457  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6458  * this operation is identified in the SEQUENCE operation in this
6459  * compound.
6460  */
6461 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6462 {
6463         struct nfs_server *server = NFS_SERVER(inode);
6464         struct rpc_clnt *clnt = server->client;
6465         struct nfs4_fsid_present_arg args = {
6466                 .fh             = NFS_FH(inode),
6467         };
6468         struct nfs4_fsid_present_res res = {
6469         };
6470         struct rpc_message msg = {
6471                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6472                 .rpc_argp       = &args,
6473                 .rpc_resp       = &res,
6474                 .rpc_cred       = cred,
6475         };
6476         int status;
6477
6478         res.fh = nfs_alloc_fhandle();
6479         if (res.fh == NULL)
6480                 return -ENOMEM;
6481
6482         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6483         nfs4_set_sequence_privileged(&args.seq_args);
6484         status = nfs4_call_sync_sequence(clnt, server, &msg,
6485                                                 &args.seq_args, &res.seq_res);
6486         nfs_free_fhandle(res.fh);
6487         if (status == NFS4_OK &&
6488             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6489                 status = -NFS4ERR_LEASE_MOVED;
6490         return status;
6491 }
6492
6493 #endif  /* CONFIG_NFS_V4_1 */
6494
6495 /**
6496  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6497  * @inode: inode on FSID to check
6498  * @cred: credential to use for this operation
6499  *
6500  * Server indicates whether the FSID is present, moved, or not
6501  * recognized.  This operation is necessary to clear a LEASE_MOVED
6502  * condition for this client ID.
6503  *
6504  * Returns NFS4_OK if the FSID is present on this server,
6505  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6506  *  NFS4ERR code if some error occurred on the server, or a
6507  *  negative errno if a local failure occurred.
6508  */
6509 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6510 {
6511         struct nfs_server *server = NFS_SERVER(inode);
6512         struct nfs_client *clp = server->nfs_client;
6513         const struct nfs4_mig_recovery_ops *ops =
6514                                         clp->cl_mvops->mig_recovery_ops;
6515         struct nfs4_exception exception = { };
6516         int status;
6517
6518         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6519                 (unsigned long long)server->fsid.major,
6520                 (unsigned long long)server->fsid.minor,
6521                 clp->cl_hostname);
6522         nfs_display_fhandle(NFS_FH(inode), __func__);
6523
6524         do {
6525                 status = ops->fsid_present(inode, cred);
6526                 if (status != -NFS4ERR_DELAY)
6527                         break;
6528                 nfs4_handle_exception(server, status, &exception);
6529         } while (exception.retry);
6530         return status;
6531 }
6532
6533 /**
6534  * If 'use_integrity' is true and the state managment nfs_client
6535  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6536  * and the machine credential as per RFC3530bis and RFC5661 Security
6537  * Considerations sections. Otherwise, just use the user cred with the
6538  * filesystem's rpc_client.
6539  */
6540 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6541 {
6542         int status;
6543         struct nfs4_secinfo_arg args = {
6544                 .dir_fh = NFS_FH(dir),
6545                 .name   = name,
6546         };
6547         struct nfs4_secinfo_res res = {
6548                 .flavors     = flavors,
6549         };
6550         struct rpc_message msg = {
6551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6552                 .rpc_argp = &args,
6553                 .rpc_resp = &res,
6554         };
6555         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6556         struct rpc_cred *cred = NULL;
6557
6558         if (use_integrity) {
6559                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6560                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6561                 msg.rpc_cred = cred;
6562         }
6563
6564         dprintk("NFS call  secinfo %s\n", name->name);
6565
6566         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6567                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6568
6569         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6570                                 &res.seq_res, 0);
6571         dprintk("NFS reply  secinfo: %d\n", status);
6572
6573         if (cred)
6574                 put_rpccred(cred);
6575
6576         return status;
6577 }
6578
6579 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6580                       struct nfs4_secinfo_flavors *flavors)
6581 {
6582         struct nfs4_exception exception = { };
6583         int err;
6584         do {
6585                 err = -NFS4ERR_WRONGSEC;
6586
6587                 /* try to use integrity protection with machine cred */
6588                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6589                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6590
6591                 /*
6592                  * if unable to use integrity protection, or SECINFO with
6593                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6594                  * disallowed by spec, but exists in deployed servers) use
6595                  * the current filesystem's rpc_client and the user cred.
6596                  */
6597                 if (err == -NFS4ERR_WRONGSEC)
6598                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6599
6600                 trace_nfs4_secinfo(dir, name, err);
6601                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6602                                 &exception);
6603         } while (exception.retry);
6604         return err;
6605 }
6606
6607 #ifdef CONFIG_NFS_V4_1
6608 /*
6609  * Check the exchange flags returned by the server for invalid flags, having
6610  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6611  * DS flags set.
6612  */
6613 static int nfs4_check_cl_exchange_flags(u32 flags)
6614 {
6615         if (flags & ~EXCHGID4_FLAG_MASK_R)
6616                 goto out_inval;
6617         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6618             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6619                 goto out_inval;
6620         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6621                 goto out_inval;
6622         return NFS_OK;
6623 out_inval:
6624         return -NFS4ERR_INVAL;
6625 }
6626
6627 static bool
6628 nfs41_same_server_scope(struct nfs41_server_scope *a,
6629                         struct nfs41_server_scope *b)
6630 {
6631         if (a->server_scope_sz == b->server_scope_sz &&
6632             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6633                 return true;
6634
6635         return false;
6636 }
6637
6638 /*
6639  * nfs4_proc_bind_conn_to_session()
6640  *
6641  * The 4.1 client currently uses the same TCP connection for the
6642  * fore and backchannel.
6643  */
6644 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6645 {
6646         int status;
6647         struct nfs41_bind_conn_to_session_res res;
6648         struct rpc_message msg = {
6649                 .rpc_proc =
6650                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6651                 .rpc_argp = clp,
6652                 .rpc_resp = &res,
6653                 .rpc_cred = cred,
6654         };
6655
6656         dprintk("--> %s\n", __func__);
6657
6658         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6659         if (unlikely(res.session == NULL)) {
6660                 status = -ENOMEM;
6661                 goto out;
6662         }
6663
6664         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6665         trace_nfs4_bind_conn_to_session(clp, status);
6666         if (status == 0) {
6667                 if (memcmp(res.session->sess_id.data,
6668                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6669                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6670                         status = -EIO;
6671                         goto out_session;
6672                 }
6673                 if (res.dir != NFS4_CDFS4_BOTH) {
6674                         dprintk("NFS: %s: Unexpected direction from server\n",
6675                                 __func__);
6676                         status = -EIO;
6677                         goto out_session;
6678                 }
6679                 if (res.use_conn_in_rdma_mode) {
6680                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6681                                 __func__);
6682                         status = -EIO;
6683                         goto out_session;
6684                 }
6685         }
6686 out_session:
6687         kfree(res.session);
6688 out:
6689         dprintk("<-- %s status= %d\n", __func__, status);
6690         return status;
6691 }
6692
6693 /*
6694  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6695  * and operations we'd like to see to enable certain features in the allow map
6696  */
6697 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6698         .how = SP4_MACH_CRED,
6699         .enforce.u.words = {
6700                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6701                       1 << (OP_EXCHANGE_ID - 32) |
6702                       1 << (OP_CREATE_SESSION - 32) |
6703                       1 << (OP_DESTROY_SESSION - 32) |
6704                       1 << (OP_DESTROY_CLIENTID - 32)
6705         },
6706         .allow.u.words = {
6707                 [0] = 1 << (OP_CLOSE) |
6708                       1 << (OP_LOCKU) |
6709                       1 << (OP_COMMIT),
6710                 [1] = 1 << (OP_SECINFO - 32) |
6711                       1 << (OP_SECINFO_NO_NAME - 32) |
6712                       1 << (OP_TEST_STATEID - 32) |
6713                       1 << (OP_FREE_STATEID - 32) |
6714                       1 << (OP_WRITE - 32)
6715         }
6716 };
6717
6718 /*
6719  * Select the state protection mode for client `clp' given the server results
6720  * from exchange_id in `sp'.
6721  *
6722  * Returns 0 on success, negative errno otherwise.
6723  */
6724 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6725                                  struct nfs41_state_protection *sp)
6726 {
6727         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6728                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6729                       1 << (OP_EXCHANGE_ID - 32) |
6730                       1 << (OP_CREATE_SESSION - 32) |
6731                       1 << (OP_DESTROY_SESSION - 32) |
6732                       1 << (OP_DESTROY_CLIENTID - 32)
6733         };
6734         unsigned int i;
6735
6736         if (sp->how == SP4_MACH_CRED) {
6737                 /* Print state protect result */
6738                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6739                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6740                         if (test_bit(i, sp->enforce.u.longs))
6741                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6742                         if (test_bit(i, sp->allow.u.longs))
6743                                 dfprintk(MOUNT, "  allow op %d\n", i);
6744                 }
6745
6746                 /* make sure nothing is on enforce list that isn't supported */
6747                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6748                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6749                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6750                                 return -EINVAL;
6751                         }
6752                 }
6753
6754                 /*
6755                  * Minimal mode - state operations are allowed to use machine
6756                  * credential.  Note this already happens by default, so the
6757                  * client doesn't have to do anything more than the negotiation.
6758                  *
6759                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6760                  *       we're already using the machine cred for exchange_id
6761                  *       and will never use a different cred.
6762                  */
6763                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6764                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6765                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6766                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6767                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6768                         dfprintk(MOUNT, "  minimal mode enabled\n");
6769                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6770                 } else {
6771                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6772                         return -EINVAL;
6773                 }
6774
6775                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6776                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6777                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6778                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6779                 }
6780
6781                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6782                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6783                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6784                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6785                 }
6786
6787                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6788                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6789                         dfprintk(MOUNT, "  stateid mode enabled\n");
6790                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6791                 }
6792
6793                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6794                         dfprintk(MOUNT, "  write mode enabled\n");
6795                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6796                 }
6797
6798                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6799                         dfprintk(MOUNT, "  commit mode enabled\n");
6800                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6801                 }
6802         }
6803
6804         return 0;
6805 }
6806
6807 /*
6808  * _nfs4_proc_exchange_id()
6809  *
6810  * Wrapper for EXCHANGE_ID operation.
6811  */
6812 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6813         u32 sp4_how)
6814 {
6815         nfs4_verifier verifier;
6816         struct nfs41_exchange_id_args args = {
6817                 .verifier = &verifier,
6818                 .client = clp,
6819 #ifdef CONFIG_NFS_V4_1_MIGRATION
6820                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6821                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6822                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6823 #else
6824                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6825                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6826 #endif
6827         };
6828         struct nfs41_exchange_id_res res = {
6829                 0
6830         };
6831         int status;
6832         struct rpc_message msg = {
6833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6834                 .rpc_argp = &args,
6835                 .rpc_resp = &res,
6836                 .rpc_cred = cred,
6837         };
6838
6839         nfs4_init_boot_verifier(clp, &verifier);
6840         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6841                                                         sizeof(args.id));
6842         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6843                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6844                 args.id_len, args.id);
6845
6846         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6847                                         GFP_NOFS);
6848         if (unlikely(res.server_owner == NULL)) {
6849                 status = -ENOMEM;
6850                 goto out;
6851         }
6852
6853         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6854                                         GFP_NOFS);
6855         if (unlikely(res.server_scope == NULL)) {
6856                 status = -ENOMEM;
6857                 goto out_server_owner;
6858         }
6859
6860         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6861         if (unlikely(res.impl_id == NULL)) {
6862                 status = -ENOMEM;
6863                 goto out_server_scope;
6864         }
6865
6866         switch (sp4_how) {
6867         case SP4_NONE:
6868                 args.state_protect.how = SP4_NONE;
6869                 break;
6870
6871         case SP4_MACH_CRED:
6872                 args.state_protect = nfs4_sp4_mach_cred_request;
6873                 break;
6874
6875         default:
6876                 /* unsupported! */
6877                 WARN_ON_ONCE(1);
6878                 status = -EINVAL;
6879                 goto out_server_scope;
6880         }
6881
6882         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6883         trace_nfs4_exchange_id(clp, status);
6884         if (status == 0)
6885                 status = nfs4_check_cl_exchange_flags(res.flags);
6886
6887         if (status == 0)
6888                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6889
6890         if (status == 0) {
6891                 clp->cl_clientid = res.clientid;
6892                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6893                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6894                         clp->cl_seqid = res.seqid;
6895
6896                 kfree(clp->cl_serverowner);
6897                 clp->cl_serverowner = res.server_owner;
6898                 res.server_owner = NULL;
6899
6900                 /* use the most recent implementation id */
6901                 kfree(clp->cl_implid);
6902                 clp->cl_implid = res.impl_id;
6903
6904                 if (clp->cl_serverscope != NULL &&
6905                     !nfs41_same_server_scope(clp->cl_serverscope,
6906                                              res.server_scope)) {
6907                         dprintk("%s: server_scope mismatch detected\n",
6908                                 __func__);
6909                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6910                         kfree(clp->cl_serverscope);
6911                         clp->cl_serverscope = NULL;
6912                 }
6913
6914                 if (clp->cl_serverscope == NULL) {
6915                         clp->cl_serverscope = res.server_scope;
6916                         goto out;
6917                 }
6918         } else
6919                 kfree(res.impl_id);
6920
6921 out_server_owner:
6922         kfree(res.server_owner);
6923 out_server_scope:
6924         kfree(res.server_scope);
6925 out:
6926         if (clp->cl_implid != NULL)
6927                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6928                         "domain: %s, name: %s, date: %llu,%u\n",
6929                         clp->cl_implid->domain, clp->cl_implid->name,
6930                         clp->cl_implid->date.seconds,
6931                         clp->cl_implid->date.nseconds);
6932         dprintk("NFS reply exchange_id: %d\n", status);
6933         return status;
6934 }
6935
6936 /*
6937  * nfs4_proc_exchange_id()
6938  *
6939  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6940  *
6941  * Since the clientid has expired, all compounds using sessions
6942  * associated with the stale clientid will be returning
6943  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6944  * be in some phase of session reset.
6945  *
6946  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6947  */
6948 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6949 {
6950         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6951         int status;
6952
6953         /* try SP4_MACH_CRED if krb5i/p */
6954         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6955             authflavor == RPC_AUTH_GSS_KRB5P) {
6956                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6957                 if (!status)
6958                         return 0;
6959         }
6960
6961         /* try SP4_NONE */
6962         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6963 }
6964
6965 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6966                 struct rpc_cred *cred)
6967 {
6968         struct rpc_message msg = {
6969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6970                 .rpc_argp = clp,
6971                 .rpc_cred = cred,
6972         };
6973         int status;
6974
6975         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6976         trace_nfs4_destroy_clientid(clp, status);
6977         if (status)
6978                 dprintk("NFS: Got error %d from the server %s on "
6979                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6980         return status;
6981 }
6982
6983 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6984                 struct rpc_cred *cred)
6985 {
6986         unsigned int loop;
6987         int ret;
6988
6989         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6990                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6991                 switch (ret) {
6992                 case -NFS4ERR_DELAY:
6993                 case -NFS4ERR_CLIENTID_BUSY:
6994                         ssleep(1);
6995                         break;
6996                 default:
6997                         return ret;
6998                 }
6999         }
7000         return 0;
7001 }
7002
7003 int nfs4_destroy_clientid(struct nfs_client *clp)
7004 {
7005         struct rpc_cred *cred;
7006         int ret = 0;
7007
7008         if (clp->cl_mvops->minor_version < 1)
7009                 goto out;
7010         if (clp->cl_exchange_flags == 0)
7011                 goto out;
7012         if (clp->cl_preserve_clid)
7013                 goto out;
7014         cred = nfs4_get_clid_cred(clp);
7015         ret = nfs4_proc_destroy_clientid(clp, cred);
7016         if (cred)
7017                 put_rpccred(cred);
7018         switch (ret) {
7019         case 0:
7020         case -NFS4ERR_STALE_CLIENTID:
7021                 clp->cl_exchange_flags = 0;
7022         }
7023 out:
7024         return ret;
7025 }
7026
7027 struct nfs4_get_lease_time_data {
7028         struct nfs4_get_lease_time_args *args;
7029         struct nfs4_get_lease_time_res *res;
7030         struct nfs_client *clp;
7031 };
7032
7033 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7034                                         void *calldata)
7035 {
7036         struct nfs4_get_lease_time_data *data =
7037                         (struct nfs4_get_lease_time_data *)calldata;
7038
7039         dprintk("--> %s\n", __func__);
7040         /* just setup sequence, do not trigger session recovery
7041            since we're invoked within one */
7042         nfs41_setup_sequence(data->clp->cl_session,
7043                         &data->args->la_seq_args,
7044                         &data->res->lr_seq_res,
7045                         task);
7046         dprintk("<-- %s\n", __func__);
7047 }
7048
7049 /*
7050  * Called from nfs4_state_manager thread for session setup, so don't recover
7051  * from sequence operation or clientid errors.
7052  */
7053 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7054 {
7055         struct nfs4_get_lease_time_data *data =
7056                         (struct nfs4_get_lease_time_data *)calldata;
7057
7058         dprintk("--> %s\n", __func__);
7059         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7060                 return;
7061         switch (task->tk_status) {
7062         case -NFS4ERR_DELAY:
7063         case -NFS4ERR_GRACE:
7064                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7065                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7066                 task->tk_status = 0;
7067                 /* fall through */
7068         case -NFS4ERR_RETRY_UNCACHED_REP:
7069                 rpc_restart_call_prepare(task);
7070                 return;
7071         }
7072         dprintk("<-- %s\n", __func__);
7073 }
7074
7075 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7076         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7077         .rpc_call_done = nfs4_get_lease_time_done,
7078 };
7079
7080 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7081 {
7082         struct rpc_task *task;
7083         struct nfs4_get_lease_time_args args;
7084         struct nfs4_get_lease_time_res res = {
7085                 .lr_fsinfo = fsinfo,
7086         };
7087         struct nfs4_get_lease_time_data data = {
7088                 .args = &args,
7089                 .res = &res,
7090                 .clp = clp,
7091         };
7092         struct rpc_message msg = {
7093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7094                 .rpc_argp = &args,
7095                 .rpc_resp = &res,
7096         };
7097         struct rpc_task_setup task_setup = {
7098                 .rpc_client = clp->cl_rpcclient,
7099                 .rpc_message = &msg,
7100                 .callback_ops = &nfs4_get_lease_time_ops,
7101                 .callback_data = &data,
7102                 .flags = RPC_TASK_TIMEOUT,
7103         };
7104         int status;
7105
7106         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7107         nfs4_set_sequence_privileged(&args.la_seq_args);
7108         dprintk("--> %s\n", __func__);
7109         task = rpc_run_task(&task_setup);
7110
7111         if (IS_ERR(task))
7112                 status = PTR_ERR(task);
7113         else {
7114                 status = task->tk_status;
7115                 rpc_put_task(task);
7116         }
7117         dprintk("<-- %s return %d\n", __func__, status);
7118
7119         return status;
7120 }
7121
7122 /*
7123  * Initialize the values to be used by the client in CREATE_SESSION
7124  * If nfs4_init_session set the fore channel request and response sizes,
7125  * use them.
7126  *
7127  * Set the back channel max_resp_sz_cached to zero to force the client to
7128  * always set csa_cachethis to FALSE because the current implementation
7129  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7130  */
7131 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7132 {
7133         unsigned int max_rqst_sz, max_resp_sz;
7134
7135         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7136         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7137
7138         /* Fore channel attributes */
7139         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7140         args->fc_attrs.max_resp_sz = max_resp_sz;
7141         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7142         args->fc_attrs.max_reqs = max_session_slots;
7143
7144         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7145                 "max_ops=%u max_reqs=%u\n",
7146                 __func__,
7147                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7148                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7149
7150         /* Back channel attributes */
7151         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7152         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7153         args->bc_attrs.max_resp_sz_cached = 0;
7154         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7155         args->bc_attrs.max_reqs = 1;
7156
7157         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7158                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7159                 __func__,
7160                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7161                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7162                 args->bc_attrs.max_reqs);
7163 }
7164
7165 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7166 {
7167         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7168         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7169
7170         if (rcvd->max_resp_sz > sent->max_resp_sz)
7171                 return -EINVAL;
7172         /*
7173          * Our requested max_ops is the minimum we need; we're not
7174          * prepared to break up compounds into smaller pieces than that.
7175          * So, no point even trying to continue if the server won't
7176          * cooperate:
7177          */
7178         if (rcvd->max_ops < sent->max_ops)
7179                 return -EINVAL;
7180         if (rcvd->max_reqs == 0)
7181                 return -EINVAL;
7182         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7183                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7184         return 0;
7185 }
7186
7187 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7188 {
7189         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7190         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7191
7192         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7193                 return -EINVAL;
7194         if (rcvd->max_resp_sz < sent->max_resp_sz)
7195                 return -EINVAL;
7196         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7197                 return -EINVAL;
7198         /* These would render the backchannel useless: */
7199         if (rcvd->max_ops != sent->max_ops)
7200                 return -EINVAL;
7201         if (rcvd->max_reqs != sent->max_reqs)
7202                 return -EINVAL;
7203         return 0;
7204 }
7205
7206 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7207                                      struct nfs4_session *session)
7208 {
7209         int ret;
7210
7211         ret = nfs4_verify_fore_channel_attrs(args, session);
7212         if (ret)
7213                 return ret;
7214         return nfs4_verify_back_channel_attrs(args, session);
7215 }
7216
7217 static int _nfs4_proc_create_session(struct nfs_client *clp,
7218                 struct rpc_cred *cred)
7219 {
7220         struct nfs4_session *session = clp->cl_session;
7221         struct nfs41_create_session_args args = {
7222                 .client = clp,
7223                 .cb_program = NFS4_CALLBACK,
7224         };
7225         struct nfs41_create_session_res res = {
7226                 .client = clp,
7227         };
7228         struct rpc_message msg = {
7229                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7230                 .rpc_argp = &args,
7231                 .rpc_resp = &res,
7232                 .rpc_cred = cred,
7233         };
7234         int status;
7235
7236         nfs4_init_channel_attrs(&args);
7237         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7238
7239         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7240         trace_nfs4_create_session(clp, status);
7241
7242         if (!status) {
7243                 /* Verify the session's negotiated channel_attrs values */
7244                 status = nfs4_verify_channel_attrs(&args, session);
7245                 /* Increment the clientid slot sequence id */
7246                 clp->cl_seqid++;
7247         }
7248
7249         return status;
7250 }
7251
7252 /*
7253  * Issues a CREATE_SESSION operation to the server.
7254  * It is the responsibility of the caller to verify the session is
7255  * expired before calling this routine.
7256  */
7257 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7258 {
7259         int status;
7260         unsigned *ptr;
7261         struct nfs4_session *session = clp->cl_session;
7262
7263         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7264
7265         status = _nfs4_proc_create_session(clp, cred);
7266         if (status)
7267                 goto out;
7268
7269         /* Init or reset the session slot tables */
7270         status = nfs4_setup_session_slot_tables(session);
7271         dprintk("slot table setup returned %d\n", status);
7272         if (status)
7273                 goto out;
7274
7275         ptr = (unsigned *)&session->sess_id.data[0];
7276         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7277                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7278 out:
7279         dprintk("<-- %s\n", __func__);
7280         return status;
7281 }
7282
7283 /*
7284  * Issue the over-the-wire RPC DESTROY_SESSION.
7285  * The caller must serialize access to this routine.
7286  */
7287 int nfs4_proc_destroy_session(struct nfs4_session *session,
7288                 struct rpc_cred *cred)
7289 {
7290         struct rpc_message msg = {
7291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7292                 .rpc_argp = session,
7293                 .rpc_cred = cred,
7294         };
7295         int status = 0;
7296
7297         dprintk("--> nfs4_proc_destroy_session\n");
7298
7299         /* session is still being setup */
7300         if (session->clp->cl_cons_state != NFS_CS_READY)
7301                 return status;
7302
7303         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7304         trace_nfs4_destroy_session(session->clp, status);
7305
7306         if (status)
7307                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7308                         "Session has been destroyed regardless...\n", status);
7309
7310         dprintk("<-- nfs4_proc_destroy_session\n");
7311         return status;
7312 }
7313
7314 /*
7315  * Renew the cl_session lease.
7316  */
7317 struct nfs4_sequence_data {
7318         struct nfs_client *clp;
7319         struct nfs4_sequence_args args;
7320         struct nfs4_sequence_res res;
7321 };
7322
7323 static void nfs41_sequence_release(void *data)
7324 {
7325         struct nfs4_sequence_data *calldata = data;
7326         struct nfs_client *clp = calldata->clp;
7327
7328         if (atomic_read(&clp->cl_count) > 1)
7329                 nfs4_schedule_state_renewal(clp);
7330         nfs_put_client(clp);
7331         kfree(calldata);
7332 }
7333
7334 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7335 {
7336         switch(task->tk_status) {
7337         case -NFS4ERR_DELAY:
7338                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7339                 return -EAGAIN;
7340         default:
7341                 nfs4_schedule_lease_recovery(clp);
7342         }
7343         return 0;
7344 }
7345
7346 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7347 {
7348         struct nfs4_sequence_data *calldata = data;
7349         struct nfs_client *clp = calldata->clp;
7350
7351         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7352                 return;
7353
7354         trace_nfs4_sequence(clp, task->tk_status);
7355         if (task->tk_status < 0) {
7356                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7357                 if (atomic_read(&clp->cl_count) == 1)
7358                         goto out;
7359
7360                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7361                         rpc_restart_call_prepare(task);
7362                         return;
7363                 }
7364         }
7365         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7366 out:
7367         dprintk("<-- %s\n", __func__);
7368 }
7369
7370 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7371 {
7372         struct nfs4_sequence_data *calldata = data;
7373         struct nfs_client *clp = calldata->clp;
7374         struct nfs4_sequence_args *args;
7375         struct nfs4_sequence_res *res;
7376
7377         args = task->tk_msg.rpc_argp;
7378         res = task->tk_msg.rpc_resp;
7379
7380         nfs41_setup_sequence(clp->cl_session, args, res, task);
7381 }
7382
7383 static const struct rpc_call_ops nfs41_sequence_ops = {
7384         .rpc_call_done = nfs41_sequence_call_done,
7385         .rpc_call_prepare = nfs41_sequence_prepare,
7386         .rpc_release = nfs41_sequence_release,
7387 };
7388
7389 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7390                 struct rpc_cred *cred,
7391                 bool is_privileged)
7392 {
7393         struct nfs4_sequence_data *calldata;
7394         struct rpc_message msg = {
7395                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7396                 .rpc_cred = cred,
7397         };
7398         struct rpc_task_setup task_setup_data = {
7399                 .rpc_client = clp->cl_rpcclient,
7400                 .rpc_message = &msg,
7401                 .callback_ops = &nfs41_sequence_ops,
7402                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7403         };
7404
7405         if (!atomic_inc_not_zero(&clp->cl_count))
7406                 return ERR_PTR(-EIO);
7407         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7408         if (calldata == NULL) {
7409                 nfs_put_client(clp);
7410                 return ERR_PTR(-ENOMEM);
7411         }
7412         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7413         if (is_privileged)
7414                 nfs4_set_sequence_privileged(&calldata->args);
7415         msg.rpc_argp = &calldata->args;
7416         msg.rpc_resp = &calldata->res;
7417         calldata->clp = clp;
7418         task_setup_data.callback_data = calldata;
7419
7420         return rpc_run_task(&task_setup_data);
7421 }
7422
7423 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7424 {
7425         struct rpc_task *task;
7426         int ret = 0;
7427
7428         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7429                 return -EAGAIN;
7430         task = _nfs41_proc_sequence(clp, cred, false);
7431         if (IS_ERR(task))
7432                 ret = PTR_ERR(task);
7433         else
7434                 rpc_put_task_async(task);
7435         dprintk("<-- %s status=%d\n", __func__, ret);
7436         return ret;
7437 }
7438
7439 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7440 {
7441         struct rpc_task *task;
7442         int ret;
7443
7444         task = _nfs41_proc_sequence(clp, cred, true);
7445         if (IS_ERR(task)) {
7446                 ret = PTR_ERR(task);
7447                 goto out;
7448         }
7449         ret = rpc_wait_for_completion_task(task);
7450         if (!ret) {
7451                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7452
7453                 if (task->tk_status == 0)
7454                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7455                 ret = task->tk_status;
7456         }
7457         rpc_put_task(task);
7458 out:
7459         dprintk("<-- %s status=%d\n", __func__, ret);
7460         return ret;
7461 }
7462
7463 struct nfs4_reclaim_complete_data {
7464         struct nfs_client *clp;
7465         struct nfs41_reclaim_complete_args arg;
7466         struct nfs41_reclaim_complete_res res;
7467 };
7468
7469 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7470 {
7471         struct nfs4_reclaim_complete_data *calldata = data;
7472
7473         nfs41_setup_sequence(calldata->clp->cl_session,
7474                         &calldata->arg.seq_args,
7475                         &calldata->res.seq_res,
7476                         task);
7477 }
7478
7479 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7480 {
7481         switch(task->tk_status) {
7482         case 0:
7483         case -NFS4ERR_COMPLETE_ALREADY:
7484         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7485                 break;
7486         case -NFS4ERR_DELAY:
7487                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7488                 /* fall through */
7489         case -NFS4ERR_RETRY_UNCACHED_REP:
7490                 return -EAGAIN;
7491         default:
7492                 nfs4_schedule_lease_recovery(clp);
7493         }
7494         return 0;
7495 }
7496
7497 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7498 {
7499         struct nfs4_reclaim_complete_data *calldata = data;
7500         struct nfs_client *clp = calldata->clp;
7501         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7502
7503         dprintk("--> %s\n", __func__);
7504         if (!nfs41_sequence_done(task, res))
7505                 return;
7506
7507         trace_nfs4_reclaim_complete(clp, task->tk_status);
7508         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7509                 rpc_restart_call_prepare(task);
7510                 return;
7511         }
7512         dprintk("<-- %s\n", __func__);
7513 }
7514
7515 static void nfs4_free_reclaim_complete_data(void *data)
7516 {
7517         struct nfs4_reclaim_complete_data *calldata = data;
7518
7519         kfree(calldata);
7520 }
7521
7522 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7523         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7524         .rpc_call_done = nfs4_reclaim_complete_done,
7525         .rpc_release = nfs4_free_reclaim_complete_data,
7526 };
7527
7528 /*
7529  * Issue a global reclaim complete.
7530  */
7531 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7532                 struct rpc_cred *cred)
7533 {
7534         struct nfs4_reclaim_complete_data *calldata;
7535         struct rpc_task *task;
7536         struct rpc_message msg = {
7537                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7538                 .rpc_cred = cred,
7539         };
7540         struct rpc_task_setup task_setup_data = {
7541                 .rpc_client = clp->cl_rpcclient,
7542                 .rpc_message = &msg,
7543                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7544                 .flags = RPC_TASK_ASYNC,
7545         };
7546         int status = -ENOMEM;
7547
7548         dprintk("--> %s\n", __func__);
7549         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7550         if (calldata == NULL)
7551                 goto out;
7552         calldata->clp = clp;
7553         calldata->arg.one_fs = 0;
7554
7555         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7556         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7557         msg.rpc_argp = &calldata->arg;
7558         msg.rpc_resp = &calldata->res;
7559         task_setup_data.callback_data = calldata;
7560         task = rpc_run_task(&task_setup_data);
7561         if (IS_ERR(task)) {
7562                 status = PTR_ERR(task);
7563                 goto out;
7564         }
7565         status = nfs4_wait_for_completion_rpc_task(task);
7566         if (status == 0)
7567                 status = task->tk_status;
7568         rpc_put_task(task);
7569         return 0;
7570 out:
7571         dprintk("<-- %s status=%d\n", __func__, status);
7572         return status;
7573 }
7574
7575 static void
7576 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7577 {
7578         struct nfs4_layoutget *lgp = calldata;
7579         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7580         struct nfs4_session *session = nfs4_get_session(server);
7581
7582         dprintk("--> %s\n", __func__);
7583         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7584          * right now covering the LAYOUTGET we are about to send.
7585          * However, that is not so catastrophic, and there seems
7586          * to be no way to prevent it completely.
7587          */
7588         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7589                                 &lgp->res.seq_res, task))
7590                 return;
7591         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7592                                           NFS_I(lgp->args.inode)->layout,
7593                                           &lgp->args.range,
7594                                           lgp->args.ctx->state)) {
7595                 rpc_exit(task, NFS4_OK);
7596         }
7597 }
7598
7599 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7600 {
7601         struct nfs4_layoutget *lgp = calldata;
7602         struct inode *inode = lgp->args.inode;
7603         struct nfs_server *server = NFS_SERVER(inode);
7604         struct pnfs_layout_hdr *lo;
7605         struct nfs4_state *state = NULL;
7606         unsigned long timeo, now, giveup;
7607
7608         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7609
7610         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7611                 goto out;
7612
7613         switch (task->tk_status) {
7614         case 0:
7615                 goto out;
7616         /*
7617          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7618          * (or clients) writing to the same RAID stripe
7619          */
7620         case -NFS4ERR_LAYOUTTRYLATER:
7621         /*
7622          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7623          * existing layout before getting a new one).
7624          */
7625         case -NFS4ERR_RECALLCONFLICT:
7626                 timeo = rpc_get_timeout(task->tk_client);
7627                 giveup = lgp->args.timestamp + timeo;
7628                 now = jiffies;
7629                 if (time_after(giveup, now)) {
7630                         unsigned long delay;
7631
7632                         /* Delay for:
7633                          * - Not less then NFS4_POLL_RETRY_MIN.
7634                          * - One last time a jiffie before we give up
7635                          * - exponential backoff (time_now minus start_attempt)
7636                          */
7637                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7638                                     min((giveup - now - 1),
7639                                         now - lgp->args.timestamp));
7640
7641                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7642                                 __func__, delay);
7643                         rpc_delay(task, delay);
7644                         task->tk_status = 0;
7645                         rpc_restart_call_prepare(task);
7646                         goto out; /* Do not call nfs4_async_handle_error() */
7647                 }
7648                 break;
7649         case -NFS4ERR_EXPIRED:
7650         case -NFS4ERR_BAD_STATEID:
7651                 spin_lock(&inode->i_lock);
7652                 lo = NFS_I(inode)->layout;
7653                 if (!lo || list_empty(&lo->plh_segs)) {
7654                         spin_unlock(&inode->i_lock);
7655                         /* If the open stateid was bad, then recover it. */
7656                         state = lgp->args.ctx->state;
7657                 } else {
7658                         LIST_HEAD(head);
7659
7660                         /*
7661                          * Mark the bad layout state as invalid, then retry
7662                          * with the current stateid.
7663                          */
7664                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7665                         spin_unlock(&inode->i_lock);
7666                         pnfs_free_lseg_list(&head);
7667
7668                         task->tk_status = 0;
7669                         rpc_restart_call_prepare(task);
7670                 }
7671         }
7672         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7673                 rpc_restart_call_prepare(task);
7674 out:
7675         dprintk("<-- %s\n", __func__);
7676 }
7677
7678 static size_t max_response_pages(struct nfs_server *server)
7679 {
7680         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7681         return nfs_page_array_len(0, max_resp_sz);
7682 }
7683
7684 static void nfs4_free_pages(struct page **pages, size_t size)
7685 {
7686         int i;
7687
7688         if (!pages)
7689                 return;
7690
7691         for (i = 0; i < size; i++) {
7692                 if (!pages[i])
7693                         break;
7694                 __free_page(pages[i]);
7695         }
7696         kfree(pages);
7697 }
7698
7699 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7700 {
7701         struct page **pages;
7702         int i;
7703
7704         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7705         if (!pages) {
7706                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7707                 return NULL;
7708         }
7709
7710         for (i = 0; i < size; i++) {
7711                 pages[i] = alloc_page(gfp_flags);
7712                 if (!pages[i]) {
7713                         dprintk("%s: failed to allocate page\n", __func__);
7714                         nfs4_free_pages(pages, size);
7715                         return NULL;
7716                 }
7717         }
7718
7719         return pages;
7720 }
7721
7722 static void nfs4_layoutget_release(void *calldata)
7723 {
7724         struct nfs4_layoutget *lgp = calldata;
7725         struct inode *inode = lgp->args.inode;
7726         struct nfs_server *server = NFS_SERVER(inode);
7727         size_t max_pages = max_response_pages(server);
7728
7729         dprintk("--> %s\n", __func__);
7730         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7731         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7732         put_nfs_open_context(lgp->args.ctx);
7733         kfree(calldata);
7734         dprintk("<-- %s\n", __func__);
7735 }
7736
7737 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7738         .rpc_call_prepare = nfs4_layoutget_prepare,
7739         .rpc_call_done = nfs4_layoutget_done,
7740         .rpc_release = nfs4_layoutget_release,
7741 };
7742
7743 struct pnfs_layout_segment *
7744 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7745 {
7746         struct inode *inode = lgp->args.inode;
7747         struct nfs_server *server = NFS_SERVER(inode);
7748         size_t max_pages = max_response_pages(server);
7749         struct rpc_task *task;
7750         struct rpc_message msg = {
7751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7752                 .rpc_argp = &lgp->args,
7753                 .rpc_resp = &lgp->res,
7754                 .rpc_cred = lgp->cred,
7755         };
7756         struct rpc_task_setup task_setup_data = {
7757                 .rpc_client = server->client,
7758                 .rpc_message = &msg,
7759                 .callback_ops = &nfs4_layoutget_call_ops,
7760                 .callback_data = lgp,
7761                 .flags = RPC_TASK_ASYNC,
7762         };
7763         struct pnfs_layout_segment *lseg = NULL;
7764         int status = 0;
7765
7766         dprintk("--> %s\n", __func__);
7767
7768         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7769         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7770
7771         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7772         if (!lgp->args.layout.pages) {
7773                 nfs4_layoutget_release(lgp);
7774                 return ERR_PTR(-ENOMEM);
7775         }
7776         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7777         lgp->args.timestamp = jiffies;
7778
7779         lgp->res.layoutp = &lgp->args.layout;
7780         lgp->res.seq_res.sr_slot = NULL;
7781         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7782
7783         task = rpc_run_task(&task_setup_data);
7784         if (IS_ERR(task))
7785                 return ERR_CAST(task);
7786         status = nfs4_wait_for_completion_rpc_task(task);
7787         if (status == 0)
7788                 status = task->tk_status;
7789         trace_nfs4_layoutget(lgp->args.ctx,
7790                         &lgp->args.range,
7791                         &lgp->res.range,
7792                         status);
7793         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7794         if (status == 0 && lgp->res.layoutp->len)
7795                 lseg = pnfs_layout_process(lgp);
7796         rpc_put_task(task);
7797         dprintk("<-- %s status=%d\n", __func__, status);
7798         if (status)
7799                 return ERR_PTR(status);
7800         return lseg;
7801 }
7802
7803 static void
7804 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7805 {
7806         struct nfs4_layoutreturn *lrp = calldata;
7807
7808         dprintk("--> %s\n", __func__);
7809         nfs41_setup_sequence(lrp->clp->cl_session,
7810                         &lrp->args.seq_args,
7811                         &lrp->res.seq_res,
7812                         task);
7813 }
7814
7815 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7816 {
7817         struct nfs4_layoutreturn *lrp = calldata;
7818         struct nfs_server *server;
7819
7820         dprintk("--> %s\n", __func__);
7821
7822         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7823                 return;
7824
7825         server = NFS_SERVER(lrp->args.inode);
7826         switch (task->tk_status) {
7827         default:
7828                 task->tk_status = 0;
7829         case 0:
7830                 break;
7831         case -NFS4ERR_DELAY:
7832                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7833                         break;
7834                 rpc_restart_call_prepare(task);
7835                 return;
7836         }
7837         dprintk("<-- %s\n", __func__);
7838 }
7839
7840 static void nfs4_layoutreturn_release(void *calldata)
7841 {
7842         struct nfs4_layoutreturn *lrp = calldata;
7843         struct pnfs_layout_hdr *lo = lrp->args.layout;
7844
7845         dprintk("--> %s\n", __func__);
7846         spin_lock(&lo->plh_inode->i_lock);
7847         if (lrp->res.lrs_present)
7848                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7849         pnfs_clear_layoutreturn_waitbit(lo);
7850         clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
7851         rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
7852         lo->plh_block_lgets--;
7853         spin_unlock(&lo->plh_inode->i_lock);
7854         pnfs_put_layout_hdr(lrp->args.layout);
7855         kfree(calldata);
7856         dprintk("<-- %s\n", __func__);
7857 }
7858
7859 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7860         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7861         .rpc_call_done = nfs4_layoutreturn_done,
7862         .rpc_release = nfs4_layoutreturn_release,
7863 };
7864
7865 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
7866 {
7867         struct rpc_task *task;
7868         struct rpc_message msg = {
7869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7870                 .rpc_argp = &lrp->args,
7871                 .rpc_resp = &lrp->res,
7872                 .rpc_cred = lrp->cred,
7873         };
7874         struct rpc_task_setup task_setup_data = {
7875                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7876                 .rpc_message = &msg,
7877                 .callback_ops = &nfs4_layoutreturn_call_ops,
7878                 .callback_data = lrp,
7879                 .flags = RPC_TASK_ASYNC,
7880         };
7881         int status = 0;
7882
7883         dprintk("--> %s\n", __func__);
7884         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7885         task = rpc_run_task(&task_setup_data);
7886         if (IS_ERR(task))
7887                 return PTR_ERR(task);
7888         if (sync == false)
7889                 goto out;
7890         status = nfs4_wait_for_completion_rpc_task(task);
7891         if (status != 0)
7892                 goto out;
7893         status = task->tk_status;
7894         trace_nfs4_layoutreturn(lrp->args.inode, status);
7895 out:
7896         dprintk("<-- %s status=%d\n", __func__, status);
7897         rpc_put_task(task);
7898         return status;
7899 }
7900
7901 static int
7902 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7903                 struct pnfs_device *pdev,
7904                 struct rpc_cred *cred)
7905 {
7906         struct nfs4_getdeviceinfo_args args = {
7907                 .pdev = pdev,
7908         };
7909         struct nfs4_getdeviceinfo_res res = {
7910                 .pdev = pdev,
7911         };
7912         struct rpc_message msg = {
7913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7914                 .rpc_argp = &args,
7915                 .rpc_resp = &res,
7916                 .rpc_cred = cred,
7917         };
7918         int status;
7919
7920         dprintk("--> %s\n", __func__);
7921         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7922         dprintk("<-- %s status=%d\n", __func__, status);
7923
7924         return status;
7925 }
7926
7927 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7928                 struct pnfs_device *pdev,
7929                 struct rpc_cred *cred)
7930 {
7931         struct nfs4_exception exception = { };
7932         int err;
7933
7934         do {
7935                 err = nfs4_handle_exception(server,
7936                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7937                                         &exception);
7938         } while (exception.retry);
7939         return err;
7940 }
7941 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7942
7943 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7944 {
7945         struct nfs4_layoutcommit_data *data = calldata;
7946         struct nfs_server *server = NFS_SERVER(data->args.inode);
7947         struct nfs4_session *session = nfs4_get_session(server);
7948
7949         nfs41_setup_sequence(session,
7950                         &data->args.seq_args,
7951                         &data->res.seq_res,
7952                         task);
7953 }
7954
7955 static void
7956 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7957 {
7958         struct nfs4_layoutcommit_data *data = calldata;
7959         struct nfs_server *server = NFS_SERVER(data->args.inode);
7960
7961         if (!nfs41_sequence_done(task, &data->res.seq_res))
7962                 return;
7963
7964         switch (task->tk_status) { /* Just ignore these failures */
7965         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7966         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7967         case -NFS4ERR_BADLAYOUT:     /* no layout */
7968         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7969                 task->tk_status = 0;
7970         case 0:
7971                 break;
7972         default:
7973                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7974                         rpc_restart_call_prepare(task);
7975                         return;
7976                 }
7977         }
7978 }
7979
7980 static void nfs4_layoutcommit_release(void *calldata)
7981 {
7982         struct nfs4_layoutcommit_data *data = calldata;
7983
7984         pnfs_cleanup_layoutcommit(data);
7985         nfs_post_op_update_inode_force_wcc(data->args.inode,
7986                                            data->res.fattr);
7987         put_rpccred(data->cred);
7988         kfree(data);
7989 }
7990
7991 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7992         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7993         .rpc_call_done = nfs4_layoutcommit_done,
7994         .rpc_release = nfs4_layoutcommit_release,
7995 };
7996
7997 int
7998 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7999 {
8000         struct rpc_message msg = {
8001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8002                 .rpc_argp = &data->args,
8003                 .rpc_resp = &data->res,
8004                 .rpc_cred = data->cred,
8005         };
8006         struct rpc_task_setup task_setup_data = {
8007                 .task = &data->task,
8008                 .rpc_client = NFS_CLIENT(data->args.inode),
8009                 .rpc_message = &msg,
8010                 .callback_ops = &nfs4_layoutcommit_ops,
8011                 .callback_data = data,
8012                 .flags = RPC_TASK_ASYNC,
8013         };
8014         struct rpc_task *task;
8015         int status = 0;
8016
8017         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
8018                 "lbw: %llu inode %lu\n",
8019                 data->task.tk_pid, sync,
8020                 data->args.lastbytewritten,
8021                 data->args.inode->i_ino);
8022
8023         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8024         task = rpc_run_task(&task_setup_data);
8025         if (IS_ERR(task))
8026                 return PTR_ERR(task);
8027         if (sync == false)
8028                 goto out;
8029         status = nfs4_wait_for_completion_rpc_task(task);
8030         if (status != 0)
8031                 goto out;
8032         status = task->tk_status;
8033         trace_nfs4_layoutcommit(data->args.inode, status);
8034 out:
8035         dprintk("%s: status %d\n", __func__, status);
8036         rpc_put_task(task);
8037         return status;
8038 }
8039
8040 /**
8041  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8042  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8043  */
8044 static int
8045 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8046                     struct nfs_fsinfo *info,
8047                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8048 {
8049         struct nfs41_secinfo_no_name_args args = {
8050                 .style = SECINFO_STYLE_CURRENT_FH,
8051         };
8052         struct nfs4_secinfo_res res = {
8053                 .flavors = flavors,
8054         };
8055         struct rpc_message msg = {
8056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8057                 .rpc_argp = &args,
8058                 .rpc_resp = &res,
8059         };
8060         struct rpc_clnt *clnt = server->client;
8061         struct rpc_cred *cred = NULL;
8062         int status;
8063
8064         if (use_integrity) {
8065                 clnt = server->nfs_client->cl_rpcclient;
8066                 cred = nfs4_get_clid_cred(server->nfs_client);
8067                 msg.rpc_cred = cred;
8068         }
8069
8070         dprintk("--> %s\n", __func__);
8071         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8072                                 &res.seq_res, 0);
8073         dprintk("<-- %s status=%d\n", __func__, status);
8074
8075         if (cred)
8076                 put_rpccred(cred);
8077
8078         return status;
8079 }
8080
8081 static int
8082 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8083                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8084 {
8085         struct nfs4_exception exception = { };
8086         int err;
8087         do {
8088                 /* first try using integrity protection */
8089                 err = -NFS4ERR_WRONGSEC;
8090
8091                 /* try to use integrity protection with machine cred */
8092                 if (_nfs4_is_integrity_protected(server->nfs_client))
8093                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8094                                                           flavors, true);
8095
8096                 /*
8097                  * if unable to use integrity protection, or SECINFO with
8098                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8099                  * disallowed by spec, but exists in deployed servers) use
8100                  * the current filesystem's rpc_client and the user cred.
8101                  */
8102                 if (err == -NFS4ERR_WRONGSEC)
8103                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8104                                                           flavors, false);
8105
8106                 switch (err) {
8107                 case 0:
8108                 case -NFS4ERR_WRONGSEC:
8109                 case -ENOTSUPP:
8110                         goto out;
8111                 default:
8112                         err = nfs4_handle_exception(server, err, &exception);
8113                 }
8114         } while (exception.retry);
8115 out:
8116         return err;
8117 }
8118
8119 static int
8120 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8121                     struct nfs_fsinfo *info)
8122 {
8123         int err;
8124         struct page *page;
8125         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8126         struct nfs4_secinfo_flavors *flavors;
8127         struct nfs4_secinfo4 *secinfo;
8128         int i;
8129
8130         page = alloc_page(GFP_KERNEL);
8131         if (!page) {
8132                 err = -ENOMEM;
8133                 goto out;
8134         }
8135
8136         flavors = page_address(page);
8137         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8138
8139         /*
8140          * Fall back on "guess and check" method if
8141          * the server doesn't support SECINFO_NO_NAME
8142          */
8143         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8144                 err = nfs4_find_root_sec(server, fhandle, info);
8145                 goto out_freepage;
8146         }
8147         if (err)
8148                 goto out_freepage;
8149
8150         for (i = 0; i < flavors->num_flavors; i++) {
8151                 secinfo = &flavors->flavors[i];
8152
8153                 switch (secinfo->flavor) {
8154                 case RPC_AUTH_NULL:
8155                 case RPC_AUTH_UNIX:
8156                 case RPC_AUTH_GSS:
8157                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8158                                         &secinfo->flavor_info);
8159                         break;
8160                 default:
8161                         flavor = RPC_AUTH_MAXFLAVOR;
8162                         break;
8163                 }
8164
8165                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8166                         flavor = RPC_AUTH_MAXFLAVOR;
8167
8168                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8169                         err = nfs4_lookup_root_sec(server, fhandle,
8170                                                    info, flavor);
8171                         if (!err)
8172                                 break;
8173                 }
8174         }
8175
8176         if (flavor == RPC_AUTH_MAXFLAVOR)
8177                 err = -EPERM;
8178
8179 out_freepage:
8180         put_page(page);
8181         if (err == -EACCES)
8182                 return -EPERM;
8183 out:
8184         return err;
8185 }
8186
8187 static int _nfs41_test_stateid(struct nfs_server *server,
8188                 nfs4_stateid *stateid,
8189                 struct rpc_cred *cred)
8190 {
8191         int status;
8192         struct nfs41_test_stateid_args args = {
8193                 .stateid = stateid,
8194         };
8195         struct nfs41_test_stateid_res res;
8196         struct rpc_message msg = {
8197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8198                 .rpc_argp = &args,
8199                 .rpc_resp = &res,
8200                 .rpc_cred = cred,
8201         };
8202         struct rpc_clnt *rpc_client = server->client;
8203
8204         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8205                 &rpc_client, &msg);
8206
8207         dprintk("NFS call  test_stateid %p\n", stateid);
8208         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8209         nfs4_set_sequence_privileged(&args.seq_args);
8210         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8211                         &args.seq_args, &res.seq_res);
8212         if (status != NFS_OK) {
8213                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8214                 return status;
8215         }
8216         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8217         return -res.status;
8218 }
8219
8220 /**
8221  * nfs41_test_stateid - perform a TEST_STATEID operation
8222  *
8223  * @server: server / transport on which to perform the operation
8224  * @stateid: state ID to test
8225  * @cred: credential
8226  *
8227  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8228  * Otherwise a negative NFS4ERR value is returned if the operation
8229  * failed or the state ID is not currently valid.
8230  */
8231 static int nfs41_test_stateid(struct nfs_server *server,
8232                 nfs4_stateid *stateid,
8233                 struct rpc_cred *cred)
8234 {
8235         struct nfs4_exception exception = { };
8236         int err;
8237         do {
8238                 err = _nfs41_test_stateid(server, stateid, cred);
8239                 if (err != -NFS4ERR_DELAY)
8240                         break;
8241                 nfs4_handle_exception(server, err, &exception);
8242         } while (exception.retry);
8243         return err;
8244 }
8245
8246 struct nfs_free_stateid_data {
8247         struct nfs_server *server;
8248         struct nfs41_free_stateid_args args;
8249         struct nfs41_free_stateid_res res;
8250 };
8251
8252 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8253 {
8254         struct nfs_free_stateid_data *data = calldata;
8255         nfs41_setup_sequence(nfs4_get_session(data->server),
8256                         &data->args.seq_args,
8257                         &data->res.seq_res,
8258                         task);
8259 }
8260
8261 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8262 {
8263         struct nfs_free_stateid_data *data = calldata;
8264
8265         nfs41_sequence_done(task, &data->res.seq_res);
8266
8267         switch (task->tk_status) {
8268         case -NFS4ERR_DELAY:
8269                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8270                         rpc_restart_call_prepare(task);
8271         }
8272 }
8273
8274 static void nfs41_free_stateid_release(void *calldata)
8275 {
8276         kfree(calldata);
8277 }
8278
8279 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8280         .rpc_call_prepare = nfs41_free_stateid_prepare,
8281         .rpc_call_done = nfs41_free_stateid_done,
8282         .rpc_release = nfs41_free_stateid_release,
8283 };
8284
8285 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8286                 nfs4_stateid *stateid,
8287                 struct rpc_cred *cred,
8288                 bool privileged)
8289 {
8290         struct rpc_message msg = {
8291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8292                 .rpc_cred = cred,
8293         };
8294         struct rpc_task_setup task_setup = {
8295                 .rpc_client = server->client,
8296                 .rpc_message = &msg,
8297                 .callback_ops = &nfs41_free_stateid_ops,
8298                 .flags = RPC_TASK_ASYNC,
8299         };
8300         struct nfs_free_stateid_data *data;
8301
8302         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8303                 &task_setup.rpc_client, &msg);
8304
8305         dprintk("NFS call  free_stateid %p\n", stateid);
8306         data = kmalloc(sizeof(*data), GFP_NOFS);
8307         if (!data)
8308                 return ERR_PTR(-ENOMEM);
8309         data->server = server;
8310         nfs4_stateid_copy(&data->args.stateid, stateid);
8311
8312         task_setup.callback_data = data;
8313
8314         msg.rpc_argp = &data->args;
8315         msg.rpc_resp = &data->res;
8316         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8317         if (privileged)
8318                 nfs4_set_sequence_privileged(&data->args.seq_args);
8319
8320         return rpc_run_task(&task_setup);
8321 }
8322
8323 /**
8324  * nfs41_free_stateid - perform a FREE_STATEID operation
8325  *
8326  * @server: server / transport on which to perform the operation
8327  * @stateid: state ID to release
8328  * @cred: credential
8329  *
8330  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8331  * negative NFS4ERR value is returned.
8332  */
8333 static int nfs41_free_stateid(struct nfs_server *server,
8334                 nfs4_stateid *stateid,
8335                 struct rpc_cred *cred)
8336 {
8337         struct rpc_task *task;
8338         int ret;
8339
8340         task = _nfs41_free_stateid(server, stateid, cred, true);
8341         if (IS_ERR(task))
8342                 return PTR_ERR(task);
8343         ret = rpc_wait_for_completion_task(task);
8344         if (!ret)
8345                 ret = task->tk_status;
8346         rpc_put_task(task);
8347         return ret;
8348 }
8349
8350 static void
8351 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8352 {
8353         struct rpc_task *task;
8354         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8355
8356         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8357         nfs4_free_lock_state(server, lsp);
8358         if (IS_ERR(task))
8359                 return;
8360         rpc_put_task(task);
8361 }
8362
8363 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8364                 const nfs4_stateid *s2)
8365 {
8366         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8367                 return false;
8368
8369         if (s1->seqid == s2->seqid)
8370                 return true;
8371         if (s1->seqid == 0 || s2->seqid == 0)
8372                 return true;
8373
8374         return false;
8375 }
8376
8377 #endif /* CONFIG_NFS_V4_1 */
8378
8379 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8380                 const nfs4_stateid *s2)
8381 {
8382         return nfs4_stateid_match(s1, s2);
8383 }
8384
8385
8386 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8387         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8388         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8389         .recover_open   = nfs4_open_reclaim,
8390         .recover_lock   = nfs4_lock_reclaim,
8391         .establish_clid = nfs4_init_clientid,
8392         .detect_trunking = nfs40_discover_server_trunking,
8393 };
8394
8395 #if defined(CONFIG_NFS_V4_1)
8396 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8397         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8398         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8399         .recover_open   = nfs4_open_reclaim,
8400         .recover_lock   = nfs4_lock_reclaim,
8401         .establish_clid = nfs41_init_clientid,
8402         .reclaim_complete = nfs41_proc_reclaim_complete,
8403         .detect_trunking = nfs41_discover_server_trunking,
8404 };
8405 #endif /* CONFIG_NFS_V4_1 */
8406
8407 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8408         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8409         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8410         .recover_open   = nfs40_open_expired,
8411         .recover_lock   = nfs4_lock_expired,
8412         .establish_clid = nfs4_init_clientid,
8413 };
8414
8415 #if defined(CONFIG_NFS_V4_1)
8416 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8417         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8418         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8419         .recover_open   = nfs41_open_expired,
8420         .recover_lock   = nfs41_lock_expired,
8421         .establish_clid = nfs41_init_clientid,
8422 };
8423 #endif /* CONFIG_NFS_V4_1 */
8424
8425 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8426         .sched_state_renewal = nfs4_proc_async_renew,
8427         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8428         .renew_lease = nfs4_proc_renew,
8429 };
8430
8431 #if defined(CONFIG_NFS_V4_1)
8432 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8433         .sched_state_renewal = nfs41_proc_async_sequence,
8434         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8435         .renew_lease = nfs4_proc_sequence,
8436 };
8437 #endif
8438
8439 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8440         .get_locations = _nfs40_proc_get_locations,
8441         .fsid_present = _nfs40_proc_fsid_present,
8442 };
8443
8444 #if defined(CONFIG_NFS_V4_1)
8445 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8446         .get_locations = _nfs41_proc_get_locations,
8447         .fsid_present = _nfs41_proc_fsid_present,
8448 };
8449 #endif  /* CONFIG_NFS_V4_1 */
8450
8451 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8452         .minor_version = 0,
8453         .init_caps = NFS_CAP_READDIRPLUS
8454                 | NFS_CAP_ATOMIC_OPEN
8455                 | NFS_CAP_CHANGE_ATTR
8456                 | NFS_CAP_POSIX_LOCK,
8457         .init_client = nfs40_init_client,
8458         .shutdown_client = nfs40_shutdown_client,
8459         .match_stateid = nfs4_match_stateid,
8460         .find_root_sec = nfs4_find_root_sec,
8461         .free_lock_state = nfs4_release_lockowner,
8462         .alloc_seqid = nfs_alloc_seqid,
8463         .call_sync_ops = &nfs40_call_sync_ops,
8464         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8465         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8466         .state_renewal_ops = &nfs40_state_renewal_ops,
8467         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8468 };
8469
8470 #if defined(CONFIG_NFS_V4_1)
8471 static struct nfs_seqid *
8472 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8473 {
8474         return NULL;
8475 }
8476
8477 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8478         .minor_version = 1,
8479         .init_caps = NFS_CAP_READDIRPLUS
8480                 | NFS_CAP_ATOMIC_OPEN
8481                 | NFS_CAP_CHANGE_ATTR
8482                 | NFS_CAP_POSIX_LOCK
8483                 | NFS_CAP_STATEID_NFSV41
8484                 | NFS_CAP_ATOMIC_OPEN_V1,
8485         .init_client = nfs41_init_client,
8486         .shutdown_client = nfs41_shutdown_client,
8487         .match_stateid = nfs41_match_stateid,
8488         .find_root_sec = nfs41_find_root_sec,
8489         .free_lock_state = nfs41_free_lock_state,
8490         .alloc_seqid = nfs_alloc_no_seqid,
8491         .call_sync_ops = &nfs41_call_sync_ops,
8492         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8493         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8494         .state_renewal_ops = &nfs41_state_renewal_ops,
8495         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8496 };
8497 #endif
8498
8499 #if defined(CONFIG_NFS_V4_2)
8500 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8501         .minor_version = 2,
8502         .init_caps = NFS_CAP_READDIRPLUS
8503                 | NFS_CAP_ATOMIC_OPEN
8504                 | NFS_CAP_CHANGE_ATTR
8505                 | NFS_CAP_POSIX_LOCK
8506                 | NFS_CAP_STATEID_NFSV41
8507                 | NFS_CAP_ATOMIC_OPEN_V1
8508                 | NFS_CAP_ALLOCATE
8509                 | NFS_CAP_DEALLOCATE
8510                 | NFS_CAP_SEEK,
8511         .init_client = nfs41_init_client,
8512         .shutdown_client = nfs41_shutdown_client,
8513         .match_stateid = nfs41_match_stateid,
8514         .find_root_sec = nfs41_find_root_sec,
8515         .free_lock_state = nfs41_free_lock_state,
8516         .call_sync_ops = &nfs41_call_sync_ops,
8517         .alloc_seqid = nfs_alloc_no_seqid,
8518         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8519         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8520         .state_renewal_ops = &nfs41_state_renewal_ops,
8521 };
8522 #endif
8523
8524 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8525         [0] = &nfs_v4_0_minor_ops,
8526 #if defined(CONFIG_NFS_V4_1)
8527         [1] = &nfs_v4_1_minor_ops,
8528 #endif
8529 #if defined(CONFIG_NFS_V4_2)
8530         [2] = &nfs_v4_2_minor_ops,
8531 #endif
8532 };
8533
8534 static const struct inode_operations nfs4_dir_inode_operations = {
8535         .create         = nfs_create,
8536         .lookup         = nfs_lookup,
8537         .atomic_open    = nfs_atomic_open,
8538         .link           = nfs_link,
8539         .unlink         = nfs_unlink,
8540         .symlink        = nfs_symlink,
8541         .mkdir          = nfs_mkdir,
8542         .rmdir          = nfs_rmdir,
8543         .mknod          = nfs_mknod,
8544         .rename         = nfs_rename,
8545         .permission     = nfs_permission,
8546         .getattr        = nfs_getattr,
8547         .setattr        = nfs_setattr,
8548         .getxattr       = generic_getxattr,
8549         .setxattr       = generic_setxattr,
8550         .listxattr      = generic_listxattr,
8551         .removexattr    = generic_removexattr,
8552 };
8553
8554 static const struct inode_operations nfs4_file_inode_operations = {
8555         .permission     = nfs_permission,
8556         .getattr        = nfs_getattr,
8557         .setattr        = nfs_setattr,
8558         .getxattr       = generic_getxattr,
8559         .setxattr       = generic_setxattr,
8560         .listxattr      = generic_listxattr,
8561         .removexattr    = generic_removexattr,
8562 };
8563
8564 const struct nfs_rpc_ops nfs_v4_clientops = {
8565         .version        = 4,                    /* protocol version */
8566         .dentry_ops     = &nfs4_dentry_operations,
8567         .dir_inode_ops  = &nfs4_dir_inode_operations,
8568         .file_inode_ops = &nfs4_file_inode_operations,
8569         .file_ops       = &nfs4_file_operations,
8570         .getroot        = nfs4_proc_get_root,
8571         .submount       = nfs4_submount,
8572         .try_mount      = nfs4_try_mount,
8573         .getattr        = nfs4_proc_getattr,
8574         .setattr        = nfs4_proc_setattr,
8575         .lookup         = nfs4_proc_lookup,
8576         .access         = nfs4_proc_access,
8577         .readlink       = nfs4_proc_readlink,
8578         .create         = nfs4_proc_create,
8579         .remove         = nfs4_proc_remove,
8580         .unlink_setup   = nfs4_proc_unlink_setup,
8581         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8582         .unlink_done    = nfs4_proc_unlink_done,
8583         .rename_setup   = nfs4_proc_rename_setup,
8584         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8585         .rename_done    = nfs4_proc_rename_done,
8586         .link           = nfs4_proc_link,
8587         .symlink        = nfs4_proc_symlink,
8588         .mkdir          = nfs4_proc_mkdir,
8589         .rmdir          = nfs4_proc_remove,
8590         .readdir        = nfs4_proc_readdir,
8591         .mknod          = nfs4_proc_mknod,
8592         .statfs         = nfs4_proc_statfs,
8593         .fsinfo         = nfs4_proc_fsinfo,
8594         .pathconf       = nfs4_proc_pathconf,
8595         .set_capabilities = nfs4_server_capabilities,
8596         .decode_dirent  = nfs4_decode_dirent,
8597         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8598         .read_setup     = nfs4_proc_read_setup,
8599         .read_done      = nfs4_read_done,
8600         .write_setup    = nfs4_proc_write_setup,
8601         .write_done     = nfs4_write_done,
8602         .commit_setup   = nfs4_proc_commit_setup,
8603         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8604         .commit_done    = nfs4_commit_done,
8605         .lock           = nfs4_proc_lock,
8606         .clear_acl_cache = nfs4_zap_acl_attr,
8607         .close_context  = nfs4_close_context,
8608         .open_context   = nfs4_atomic_open,
8609         .have_delegation = nfs4_have_delegation,
8610         .return_delegation = nfs4_inode_return_delegation,
8611         .alloc_client   = nfs4_alloc_client,
8612         .init_client    = nfs4_init_client,
8613         .free_client    = nfs4_free_client,
8614         .create_server  = nfs4_create_server,
8615         .clone_server   = nfs_clone_server,
8616 };
8617
8618 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8619         .prefix = XATTR_NAME_NFSV4_ACL,
8620         .list   = nfs4_xattr_list_nfs4_acl,
8621         .get    = nfs4_xattr_get_nfs4_acl,
8622         .set    = nfs4_xattr_set_nfs4_acl,
8623 };
8624
8625 const struct xattr_handler *nfs4_xattr_handlers[] = {
8626         &nfs4_xattr_nfs4_acl_handler,
8627 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8628         &nfs4_xattr_nfs4_label_handler,
8629 #endif
8630         NULL
8631 };
8632
8633 /*
8634  * Local variables:
8635  *  c-basic-offset: 8
8636  * End:
8637  */