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 *);
  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         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 109                 return NULL;
 110
 111         err = security_dentry_init_security(dentry, sattr->ia_mode,
 112                                 &dentry->d_name, (void **)&label->label, &label->len);
 113         if (err == 0)
 114                 return label;
 115
 116         return NULL;
 117 }
 118 static inline void
 119 nfs4_label_release_security(struct nfs4_label *label)
 120 {
 121         if (label)
 122                 security_release_secctx(label->label, label->len);
 123 }
 124 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 125 {
 126         if (label)
 127                 return server->attr_bitmask;
 128
 129         return server->attr_bitmask_nl;
 130 }
 131 #else
 132 static inline struct nfs4_label *
 133 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 134         struct iattr *sattr, struct nfs4_label *l)
 135 { return NULL; }
 136 static inline void
 137 nfs4_label_release_security(struct nfs4_label *label)
 138 { return; }
 139 static inline u32 *
 140 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 141 { return server->attr_bitmask; }
 142 #endif
 143
 144 /* Prevent leaks of NFSv4 errors into userland */
 145 static int nfs4_map_errors(int err)
 146 {
 147         if (err >= -1000)
 148                 return err;
 149         switch (err) {
 150         case -NFS4ERR_RESOURCE:
 151         case -NFS4ERR_LAYOUTTRYLATER:
 152         case -NFS4ERR_RECALLCONFLICT:
 153                 return -EREMOTEIO;
 154         case -NFS4ERR_WRONGSEC:
 155         case -NFS4ERR_WRONG_CRED:
 156                 return -EPERM;
 157         case -NFS4ERR_BADOWNER:
 158         case -NFS4ERR_BADNAME:
 159                 return -EINVAL;
 160         case -NFS4ERR_SHARE_DENIED:
 161                 return -EACCES;
 162         case -NFS4ERR_MINOR_VERS_MISMATCH:
 163                 return -EPROTONOSUPPORT;
 164         case -NFS4ERR_ACCESS:
 165                 return -EACCES;
 166         case -NFS4ERR_FILE_OPEN:
 167                 return -EBUSY;
 168         default:
 169                 dprintk("%s could not handle NFSv4 error %d\n",
 170                                 __func__, -err);
 171                 break;
 172         }
 173         return -EIO;
 174 }
 175
 176 /*
 177  * This is our standard bitmap for GETATTR requests.
 178  */
 179 const u32 nfs4_fattr_bitmap[3] = {
 180         FATTR4_WORD0_TYPE
 181         | FATTR4_WORD0_CHANGE
 182         | FATTR4_WORD0_SIZE
 183         | FATTR4_WORD0_FSID
 184         | FATTR4_WORD0_FILEID,
 185         FATTR4_WORD1_MODE
 186         | FATTR4_WORD1_NUMLINKS
 187         | FATTR4_WORD1_OWNER
 188         | FATTR4_WORD1_OWNER_GROUP
 189         | FATTR4_WORD1_RAWDEV
 190         | FATTR4_WORD1_SPACE_USED
 191         | FATTR4_WORD1_TIME_ACCESS
 192         | FATTR4_WORD1_TIME_METADATA
 193         | FATTR4_WORD1_TIME_MODIFY,
 194 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 195         FATTR4_WORD2_SECURITY_LABEL
 196 #endif
 197 };
 198
 199 static const u32 nfs4_pnfs_open_bitmap[3] = {
 200         FATTR4_WORD0_TYPE
 201         | FATTR4_WORD0_CHANGE
 202         | FATTR4_WORD0_SIZE
 203         | FATTR4_WORD0_FSID
 204         | FATTR4_WORD0_FILEID,
 205         FATTR4_WORD1_MODE
 206         | FATTR4_WORD1_NUMLINKS
 207         | FATTR4_WORD1_OWNER
 208         | FATTR4_WORD1_OWNER_GROUP
 209         | FATTR4_WORD1_RAWDEV
 210         | FATTR4_WORD1_SPACE_USED
 211         | FATTR4_WORD1_TIME_ACCESS
 212         | FATTR4_WORD1_TIME_METADATA
 213         | FATTR4_WORD1_TIME_MODIFY,
 214         FATTR4_WORD2_MDSTHRESHOLD
 215 };
 216
 217 static const u32 nfs4_open_noattr_bitmap[3] = {
 218         FATTR4_WORD0_TYPE
 219         | FATTR4_WORD0_CHANGE
 220         | FATTR4_WORD0_FILEID,
 221 };
 222
 223 const u32 nfs4_statfs_bitmap[3] = {
 224         FATTR4_WORD0_FILES_AVAIL
 225         | FATTR4_WORD0_FILES_FREE
 226         | FATTR4_WORD0_FILES_TOTAL,
 227         FATTR4_WORD1_SPACE_AVAIL
 228         | FATTR4_WORD1_SPACE_FREE
 229         | FATTR4_WORD1_SPACE_TOTAL
 230 };
 231
 232 const u32 nfs4_pathconf_bitmap[3] = {
 233         FATTR4_WORD0_MAXLINK
 234         | FATTR4_WORD0_MAXNAME,
 235         0
 236 };
 237
 238 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 239                         | FATTR4_WORD0_MAXREAD
 240                         | FATTR4_WORD0_MAXWRITE
 241                         | FATTR4_WORD0_LEASE_TIME,
 242                         FATTR4_WORD1_TIME_DELTA
 243                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 244                         FATTR4_WORD2_LAYOUT_BLKSIZE
 245 };
 246
 247 const u32 nfs4_fs_locations_bitmap[3] = {
 248         FATTR4_WORD0_TYPE
 249         | FATTR4_WORD0_CHANGE
 250         | FATTR4_WORD0_SIZE
 251         | FATTR4_WORD0_FSID
 252         | FATTR4_WORD0_FILEID
 253         | FATTR4_WORD0_FS_LOCATIONS,
 254         FATTR4_WORD1_MODE
 255         | FATTR4_WORD1_NUMLINKS
 256         | FATTR4_WORD1_OWNER
 257         | FATTR4_WORD1_OWNER_GROUP
 258         | FATTR4_WORD1_RAWDEV
 259         | FATTR4_WORD1_SPACE_USED
 260         | FATTR4_WORD1_TIME_ACCESS
 261         | FATTR4_WORD1_TIME_METADATA
 262         | FATTR4_WORD1_TIME_MODIFY
 263         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 264 };
 265
 266 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 267                 struct nfs4_readdir_arg *readdir)
 268 {
 269         __be32 *start, *p;
 270
 271         if (cookie > 2) {
 272                 readdir->cookie = cookie;
 273                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 274                 return;
 275         }
 276
 277         readdir->cookie = 0;
 278         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 279         if (cookie == 2)
 280                 return;
 281
 282         /*
 283          * NFSv4 servers do not return entries for '.' and '..'
 284          * Therefore, we fake these entries here.  We let '.'
 285          * have cookie 0 and '..' have cookie 1.  Note that
 286          * when talking to the server, we always send cookie 0
 287          * instead of 1 or 2.
 288          */
 289         start = p = kmap_atomic(*readdir->pages);
 290
 291         if (cookie == 0) {
 292                 *p++ = xdr_one;                                  /* next */
 293                 *p++ = xdr_zero;                   /* cookie, first word */
 294                 *p++ = xdr_one;                   /* cookie, second word */
 295                 *p++ = xdr_one;                             /* entry len */
 296                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 297                 p++;
 298                 *p++ = xdr_one;                         /* bitmap length */
 299                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 300                 *p++ = htonl(8);              /* attribute buffer length */
 301                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 302         }
 303
 304         *p++ = xdr_one;                                  /* next */
 305         *p++ = xdr_zero;                   /* cookie, first word */
 306         *p++ = xdr_two;                   /* cookie, second word */
 307         *p++ = xdr_two;                             /* entry len */
 308         memcpy(p, "..\0\0", 4);                         /* entry */
 309         p++;
 310         *p++ = xdr_one;                         /* bitmap length */
 311         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 312         *p++ = htonl(8);              /* attribute buffer length */
 313         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 314
 315         readdir->pgbase = (char *)p - (char *)start;
 316         readdir->count -= readdir->pgbase;
 317         kunmap_atomic(start);
 318 }
 319
 320 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 321 {
 322         int res = 0;
 323
 324         might_sleep();
 325
 326         if (*timeout <= 0)
 327                 *timeout = NFS4_POLL_RETRY_MIN;
 328         if (*timeout > NFS4_POLL_RETRY_MAX)
 329                 *timeout = NFS4_POLL_RETRY_MAX;
 330         freezable_schedule_timeout_killable_unsafe(*timeout);
 331         if (fatal_signal_pending(current))
 332                 res = -ERESTARTSYS;
 333         *timeout <<= 1;
 334         return res;
 335 }
 336
 337 /* This is the error handling routine for processes that are allowed
 338  * to sleep.
 339  */
 340 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 341 {
 342         struct nfs_client *clp = server->nfs_client;
 343         struct nfs4_state *state = exception->state;
 344         struct inode *inode = exception->inode;
 345         int ret = errorcode;
 346
 347         exception->retry = 0;
 348         switch(errorcode) {
 349                 case 0:
 350                         return 0;
 351                 case -NFS4ERR_OPENMODE:
 352                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 353                                 nfs4_inode_return_delegation(inode);
 354                                 exception->retry = 1;
 355                                 return 0;
 356                         }
 357                         if (state == NULL)
 358                                 break;
 359                         ret = nfs4_schedule_stateid_recovery(server, state);
 360                         if (ret < 0)
 361                                 break;
 362                         goto wait_on_recovery;
 363                 case -NFS4ERR_DELEG_REVOKED:
 364                 case -NFS4ERR_ADMIN_REVOKED:
 365                 case -NFS4ERR_BAD_STATEID:
 366                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 367                                 nfs_remove_bad_delegation(inode);
 368                                 exception->retry = 1;
 369                                 break;
 370                         }
 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 #if defined(CONFIG_NFS_V4_1)
 388                 case -NFS4ERR_BADSESSION:
 389                 case -NFS4ERR_BADSLOT:
 390                 case -NFS4ERR_BAD_HIGH_SLOT:
 391                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 392                 case -NFS4ERR_DEADSESSION:
 393                 case -NFS4ERR_SEQ_FALSE_RETRY:
 394                 case -NFS4ERR_SEQ_MISORDERED:
 395                         dprintk("%s ERROR: %d Reset session\n", __func__,
 396                                 errorcode);
 397                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 398                         goto wait_on_recovery;
 399 #endif /* defined(CONFIG_NFS_V4_1) */
 400                 case -NFS4ERR_FILE_OPEN:
 401                         if (exception->timeout > HZ) {
 402                                 /* We have retried a decent amount, time to
 403                                  * fail
 404                                  */
 405                                 ret = -EBUSY;
 406                                 break;
 407                         }
 408                 case -NFS4ERR_GRACE:
 409                 case -NFS4ERR_DELAY:
 410                         ret = nfs4_delay(server->client, &exception->timeout);
 411                         if (ret != 0)
 412                                 break;
 413                 case -NFS4ERR_RETRY_UNCACHED_REP:
 414                 case -NFS4ERR_OLD_STATEID:
 415                         exception->retry = 1;
 416                         break;
 417                 case -NFS4ERR_BADOWNER:
 418                         /* The following works around a Linux server bug! */
 419                 case -NFS4ERR_BADNAME:
 420                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 421                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 422                                 exception->retry = 1;
 423                                 printk(KERN_WARNING "NFS: v4 server %s "
 424                                                 "does not accept raw "
 425                                                 "uid/gids. "
 426                                                 "Reenabling the idmapper.\n",
 427                                                 server->nfs_client->cl_hostname);
 428                         }
 429         }
 430         /* We failed to handle the error */
 431         return nfs4_map_errors(ret);
 432 wait_on_recovery:
 433         ret = nfs4_wait_clnt_recover(clp);
 434         if (ret == 0)
 435                 exception->retry = 1;
 436         return ret;
 437 }
 438
 439 /*
 440  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 441  * or 'false' otherwise.
 442  */
 443 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 444 {
 445         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 446
 447         if (flavor == RPC_AUTH_GSS_KRB5I ||
 448             flavor == RPC_AUTH_GSS_KRB5P)
 449                 return true;
 450
 451         return false;
 452 }
 453
 454 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 455 {
 456         spin_lock(&clp->cl_lock);
 457         if (time_before(clp->cl_last_renewal,timestamp))
 458                 clp->cl_last_renewal = timestamp;
 459         spin_unlock(&clp->cl_lock);
 460 }
 461
 462 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 463 {
 464         do_renew_lease(server->nfs_client, timestamp);
 465 }
 466
 467 struct nfs4_call_sync_data {
 468         const struct nfs_server *seq_server;
 469         struct nfs4_sequence_args *seq_args;
 470         struct nfs4_sequence_res *seq_res;
 471 };
 472
 473 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 474                                struct nfs4_sequence_res *res, int cache_reply)
 475 {
 476         args->sa_slot = NULL;
 477         args->sa_cache_this = cache_reply;
 478         args->sa_privileged = 0;
 479
 480         res->sr_slot = NULL;
 481 }
 482
 483 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 484 {
 485         args->sa_privileged = 1;
 486 }
 487
 488 static int nfs40_setup_sequence(const struct nfs_server *server,
 489                                 struct nfs4_sequence_args *args,
 490                                 struct nfs4_sequence_res *res,
 491                                 struct rpc_task *task)
 492 {
 493         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 494         struct nfs4_slot *slot;
 495
 496         /* slot already allocated? */
 497         if (res->sr_slot != NULL)
 498                 goto out_start;
 499
 500         spin_lock(&tbl->slot_tbl_lock);
 501         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 502                 goto out_sleep;
 503
 504         slot = nfs4_alloc_slot(tbl);
 505         if (IS_ERR(slot)) {
 506                 if (slot == ERR_PTR(-ENOMEM))
 507                         task->tk_timeout = HZ >> 2;
 508                 goto out_sleep;
 509         }
 510         spin_unlock(&tbl->slot_tbl_lock);
 511
 512         args->sa_slot = slot;
 513         res->sr_slot = slot;
 514
 515 out_start:
 516         rpc_call_start(task);
 517         return 0;
 518
 519 out_sleep:
 520         if (args->sa_privileged)
 521                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 522                                 NULL, RPC_PRIORITY_PRIVILEGED);
 523         else
 524                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 525         spin_unlock(&tbl->slot_tbl_lock);
 526         return -EAGAIN;
 527 }
 528
 529 static int nfs40_sequence_done(struct rpc_task *task,
 530                                struct nfs4_sequence_res *res)
 531 {
 532         struct nfs4_slot *slot = res->sr_slot;
 533         struct nfs4_slot_table *tbl;
 534
 535         if (!RPC_WAS_SENT(task))
 536                 goto out;
 537
 538         tbl = slot->table;
 539         spin_lock(&tbl->slot_tbl_lock);
 540         if (!nfs41_wake_and_assign_slot(tbl, slot))
 541                 nfs4_free_slot(tbl, slot);
 542         spin_unlock(&tbl->slot_tbl_lock);
 543
 544         res->sr_slot = NULL;
 545 out:
 546         return 1;
 547 }
 548
 549 #if defined(CONFIG_NFS_V4_1)
 550
 551 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 552 {
 553         struct nfs4_session *session;
 554         struct nfs4_slot_table *tbl;
 555         bool send_new_highest_used_slotid = false;
 556
 557         if (!res->sr_slot) {
 558                 /* just wake up the next guy waiting since
 559                  * we may have not consumed a slot after all */
 560                 dprintk("%s: No slot\n", __func__);
 561                 return;
 562         }
 563         tbl = res->sr_slot->table;
 564         session = tbl->session;
 565
 566         spin_lock(&tbl->slot_tbl_lock);
 567         /* Be nice to the server: try to ensure that the last transmitted
 568          * value for highest_user_slotid <= target_highest_slotid
 569          */
 570         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 571                 send_new_highest_used_slotid = true;
 572
 573         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 574                 send_new_highest_used_slotid = false;
 575                 goto out_unlock;
 576         }
 577         nfs4_free_slot(tbl, res->sr_slot);
 578
 579         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 580                 send_new_highest_used_slotid = false;
 581 out_unlock:
 582         spin_unlock(&tbl->slot_tbl_lock);
 583         res->sr_slot = NULL;
 584         if (send_new_highest_used_slotid)
 585                 nfs41_server_notify_highest_slotid_update(session->clp);
 586 }
 587
 588 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 589 {
 590         struct nfs4_session *session;
 591         struct nfs4_slot *slot;
 592         struct nfs_client *clp;
 593         bool interrupted = false;
 594         int ret = 1;
 595
 596         /* don't increment the sequence number if the task wasn't sent */
 597         if (!RPC_WAS_SENT(task))
 598                 goto out;
 599
 600         slot = res->sr_slot;
 601         session = slot->table->session;
 602
 603         if (slot->interrupted) {
 604                 slot->interrupted = 0;
 605                 interrupted = true;
 606         }
 607
 608         trace_nfs4_sequence_done(session, res);
 609         /* Check the SEQUENCE operation status */
 610         switch (res->sr_status) {
 611         case 0:
 612                 /* Update the slot's sequence and clientid lease timer */
 613                 ++slot->seq_nr;
 614                 clp = session->clp;
 615                 do_renew_lease(clp, res->sr_timestamp);
 616                 /* Check sequence flags */
 617                 if (res->sr_status_flags != 0)
 618                         nfs4_schedule_lease_recovery(clp);
 619                 nfs41_update_target_slotid(slot->table, slot, res);
 620                 break;
 621         case 1:
 622                 /*
 623                  * sr_status remains 1 if an RPC level error occurred.
 624                  * The server may or may not have processed the sequence
 625                  * operation..
 626                  * Mark the slot as having hosted an interrupted RPC call.
 627                  */
 628                 slot->interrupted = 1;
 629                 goto out;
 630         case -NFS4ERR_DELAY:
 631                 /* The server detected a resend of the RPC call and
 632                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 633                  * of RFC5661.
 634                  */
 635                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 636                         __func__,
 637                         slot->slot_nr,
 638                         slot->seq_nr);
 639                 goto out_retry;
 640         case -NFS4ERR_BADSLOT:
 641                 /*
 642                  * The slot id we used was probably retired. Try again
 643                  * using a different slot id.
 644                  */
 645                 goto retry_nowait;
 646         case -NFS4ERR_SEQ_MISORDERED:
 647                 /*
 648                  * Was the last operation on this sequence interrupted?
 649                  * If so, retry after bumping the sequence number.
 650                  */
 651                 if (interrupted) {
 652                         ++slot->seq_nr;
 653                         goto retry_nowait;
 654                 }
 655                 /*
 656                  * Could this slot have been previously retired?
 657                  * If so, then the server may be expecting seq_nr = 1!
 658                  */
 659                 if (slot->seq_nr != 1) {
 660                         slot->seq_nr = 1;
 661                         goto retry_nowait;
 662                 }
 663                 break;
 664         case -NFS4ERR_SEQ_FALSE_RETRY:
 665                 ++slot->seq_nr;
 666                 goto retry_nowait;
 667         default:
 668                 /* Just update the slot sequence no. */
 669                 ++slot->seq_nr;
 670         }
 671 out:
 672         /* The session may be reset by one of the error handlers. */
 673         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 674         nfs41_sequence_free_slot(res);
 675         return ret;
 676 retry_nowait:
 677         if (rpc_restart_call_prepare(task)) {
 678                 task->tk_status = 0;
 679                 ret = 0;
 680         }
 681         goto out;
 682 out_retry:
 683         if (!rpc_restart_call(task))
 684                 goto out;
 685         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 686         return 0;
 687 }
 688
 689 static int nfs4_sequence_done(struct rpc_task *task,
 690                                struct nfs4_sequence_res *res)
 691 {
 692         if (res->sr_slot == NULL)
 693                 return 1;
 694         if (!res->sr_slot->table->session)
 695                 return nfs40_sequence_done(task, res);
 696         return nfs41_sequence_done(task, res);
 697 }
 698
 699 int nfs41_setup_sequence(struct nfs4_session *session,
 700                                 struct nfs4_sequence_args *args,
 701                                 struct nfs4_sequence_res *res,
 702                                 struct rpc_task *task)
 703 {
 704         struct nfs4_slot *slot;
 705         struct nfs4_slot_table *tbl;
 706
 707         dprintk("--> %s\n", __func__);
 708         /* slot already allocated? */
 709         if (res->sr_slot != NULL)
 710                 goto out_success;
 711
 712         tbl = &session->fc_slot_table;
 713
 714         task->tk_timeout = 0;
 715
 716         spin_lock(&tbl->slot_tbl_lock);
 717         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 718             !args->sa_privileged) {
 719                 /* The state manager will wait until the slot table is empty */
 720                 dprintk("%s session is draining\n", __func__);
 721                 goto out_sleep;
 722         }
 723
 724         slot = nfs4_alloc_slot(tbl);
 725         if (IS_ERR(slot)) {
 726                 /* If out of memory, try again in 1/4 second */
 727                 if (slot == ERR_PTR(-ENOMEM))
 728                         task->tk_timeout = HZ >> 2;
 729                 dprintk("<-- %s: no free slots\n", __func__);
 730                 goto out_sleep;
 731         }
 732         spin_unlock(&tbl->slot_tbl_lock);
 733
 734         args->sa_slot = slot;
 735
 736         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 737                         slot->slot_nr, slot->seq_nr);
 738
 739         res->sr_slot = slot;
 740         res->sr_timestamp = jiffies;
 741         res->sr_status_flags = 0;
 742         /*
 743          * sr_status is only set in decode_sequence, and so will remain
 744          * set to 1 if an rpc level failure occurs.
 745          */
 746         res->sr_status = 1;
 747         trace_nfs4_setup_sequence(session, args);
 748 out_success:
 749         rpc_call_start(task);
 750         return 0;
 751 out_sleep:
 752         /* Privileged tasks are queued with top priority */
 753         if (args->sa_privileged)
 754                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 755                                 NULL, RPC_PRIORITY_PRIVILEGED);
 756         else
 757                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 758         spin_unlock(&tbl->slot_tbl_lock);
 759         return -EAGAIN;
 760 }
 761 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 762
 763 static int nfs4_setup_sequence(const struct nfs_server *server,
 764                                struct nfs4_sequence_args *args,
 765                                struct nfs4_sequence_res *res,
 766                                struct rpc_task *task)
 767 {
 768         struct nfs4_session *session = nfs4_get_session(server);
 769         int ret = 0;
 770
 771         if (!session)
 772                 return nfs40_setup_sequence(server, args, res, task);
 773
 774         dprintk("--> %s clp %p session %p sr_slot %u\n",
 775                 __func__, session->clp, session, res->sr_slot ?
 776                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 777
 778         ret = nfs41_setup_sequence(session, args, res, task);
 779
 780         dprintk("<-- %s status=%d\n", __func__, ret);
 781         return ret;
 782 }
 783
 784 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 785 {
 786         struct nfs4_call_sync_data *data = calldata;
 787         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 788
 789         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 790
 791         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 792 }
 793
 794 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 795 {
 796         struct nfs4_call_sync_data *data = calldata;
 797
 798         nfs41_sequence_done(task, data->seq_res);
 799 }
 800
 801 static const struct rpc_call_ops nfs41_call_sync_ops = {
 802         .rpc_call_prepare = nfs41_call_sync_prepare,
 803         .rpc_call_done = nfs41_call_sync_done,
 804 };
 805
 806 #else   /* !CONFIG_NFS_V4_1 */
 807
 808 static int nfs4_setup_sequence(const struct nfs_server *server,
 809                                struct nfs4_sequence_args *args,
 810                                struct nfs4_sequence_res *res,
 811                                struct rpc_task *task)
 812 {
 813         return nfs40_setup_sequence(server, args, res, task);
 814 }
 815
 816 static int nfs4_sequence_done(struct rpc_task *task,
 817                                struct nfs4_sequence_res *res)
 818 {
 819         return nfs40_sequence_done(task, res);
 820 }
 821
 822 #endif  /* !CONFIG_NFS_V4_1 */
 823
 824 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 825 {
 826         struct nfs4_call_sync_data *data = calldata;
 827         nfs4_setup_sequence(data->seq_server,
 828                                 data->seq_args, data->seq_res, task);
 829 }
 830
 831 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 832 {
 833         struct nfs4_call_sync_data *data = calldata;
 834         nfs4_sequence_done(task, data->seq_res);
 835 }
 836
 837 static const struct rpc_call_ops nfs40_call_sync_ops = {
 838         .rpc_call_prepare = nfs40_call_sync_prepare,
 839         .rpc_call_done = nfs40_call_sync_done,
 840 };
 841
 842 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 843                                    struct nfs_server *server,
 844                                    struct rpc_message *msg,
 845                                    struct nfs4_sequence_args *args,
 846                                    struct nfs4_sequence_res *res)
 847 {
 848         int ret;
 849         struct rpc_task *task;
 850         struct nfs_client *clp = server->nfs_client;
 851         struct nfs4_call_sync_data data = {
 852                 .seq_server = server,
 853                 .seq_args = args,
 854                 .seq_res = res,
 855         };
 856         struct rpc_task_setup task_setup = {
 857                 .rpc_client = clnt,
 858                 .rpc_message = msg,
 859                 .callback_ops = clp->cl_mvops->call_sync_ops,
 860                 .callback_data = &data
 861         };
 862
 863         task = rpc_run_task(&task_setup);
 864         if (IS_ERR(task))
 865                 ret = PTR_ERR(task);
 866         else {
 867                 ret = task->tk_status;
 868                 rpc_put_task(task);
 869         }
 870         return ret;
 871 }
 872
 873 static
 874 int nfs4_call_sync(struct rpc_clnt *clnt,
 875                    struct nfs_server *server,
 876                    struct rpc_message *msg,
 877                    struct nfs4_sequence_args *args,
 878                    struct nfs4_sequence_res *res,
 879                    int cache_reply)
 880 {
 881         nfs4_init_sequence(args, res, cache_reply);
 882         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 883 }
 884
 885 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 886 {
 887         struct nfs_inode *nfsi = NFS_I(dir);
 888
 889         spin_lock(&dir->i_lock);
 890         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 891         if (!cinfo->atomic || cinfo->before != dir->i_version)
 892                 nfs_force_lookup_revalidate(dir);
 893         dir->i_version = cinfo->after;
 894         nfs_fscache_invalidate(dir);
 895         spin_unlock(&dir->i_lock);
 896 }
 897
 898 struct nfs4_opendata {
 899         struct kref kref;
 900         struct nfs_openargs o_arg;
 901         struct nfs_openres o_res;
 902         struct nfs_open_confirmargs c_arg;
 903         struct nfs_open_confirmres c_res;
 904         struct nfs4_string owner_name;
 905         struct nfs4_string group_name;
 906         struct nfs_fattr f_attr;
 907         struct nfs4_label *f_label;
 908         struct dentry *dir;
 909         struct dentry *dentry;
 910         struct nfs4_state_owner *owner;
 911         struct nfs4_state *state;
 912         struct iattr attrs;
 913         unsigned long timestamp;
 914         unsigned int rpc_done : 1;
 915         unsigned int is_recover : 1;
 916         int rpc_status;
 917         int cancelled;
 918 };
 919
 920 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 921                 int err, struct nfs4_exception *exception)
 922 {
 923         if (err != -EINVAL)
 924                 return false;
 925         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 926                 return false;
 927         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 928         exception->retry = 1;
 929         return true;
 930 }
 931
 932 static enum open_claim_type4
 933 nfs4_map_atomic_open_claim(struct nfs_server *server,
 934                 enum open_claim_type4 claim)
 935 {
 936         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 937                 return claim;
 938         switch (claim) {
 939         default:
 940                 return claim;
 941         case NFS4_OPEN_CLAIM_FH:
 942                 return NFS4_OPEN_CLAIM_NULL;
 943         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 944                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 945         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 946                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 947         }
 948 }
 949
 950 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 951 {
 952         p->o_res.f_attr = &p->f_attr;
 953         p->o_res.f_label = p->f_label;
 954         p->o_res.seqid = p->o_arg.seqid;
 955         p->c_res.seqid = p->c_arg.seqid;
 956         p->o_res.server = p->o_arg.server;
 957         p->o_res.access_request = p->o_arg.access;
 958         nfs_fattr_init(&p->f_attr);
 959         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 960 }
 961
 962 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 963                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 964                 const struct iattr *attrs,
 965                 struct nfs4_label *label,
 966                 enum open_claim_type4 claim,
 967                 gfp_t gfp_mask)
 968 {
 969         struct dentry *parent = dget_parent(dentry);
 970         struct inode *dir = parent->d_inode;
 971         struct nfs_server *server = NFS_SERVER(dir);
 972         struct nfs4_opendata *p;
 973
 974         p = kzalloc(sizeof(*p), gfp_mask);
 975         if (p == NULL)
 976                 goto err;
 977
 978         p->f_label = nfs4_label_alloc(server, gfp_mask);
 979         if (IS_ERR(p->f_label))
 980                 goto err_free_p;
 981
 982         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 983         if (p->o_arg.seqid == NULL)
 984                 goto err_free_label;
 985         nfs_sb_active(dentry->d_sb);
 986         p->dentry = dget(dentry);
 987         p->dir = parent;
 988         p->owner = sp;
 989         atomic_inc(&sp->so_count);
 990         p->o_arg.open_flags = flags;
 991         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 992         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 993          * will return permission denied for all bits until close */
 994         if (!(flags & O_EXCL)) {
 995                 /* ask server to check for all possible rights as results
 996                  * are cached */
 997                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 998                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 999         }
1000         p->o_arg.clientid = server->nfs_client->cl_clientid;
1001         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1002         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1003         p->o_arg.name = &dentry->d_name;
1004         p->o_arg.server = server;
1005         p->o_arg.bitmask = nfs4_bitmask(server, label);
1006         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1007         p->o_arg.label = label;
1008         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1009         switch (p->o_arg.claim) {
1010         case NFS4_OPEN_CLAIM_NULL:
1011         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1012         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1013                 p->o_arg.fh = NFS_FH(dir);
1014                 break;
1015         case NFS4_OPEN_CLAIM_PREVIOUS:
1016         case NFS4_OPEN_CLAIM_FH:
1017         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1018         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1019                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1020         }
1021         if (attrs != NULL && attrs->ia_valid != 0) {
1022                 __u32 verf[2];
1023
1024                 p->o_arg.u.attrs = &p->attrs;
1025                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1026
1027                 verf[0] = jiffies;
1028                 verf[1] = current->pid;
1029                 memcpy(p->o_arg.u.verifier.data, verf,
1030                                 sizeof(p->o_arg.u.verifier.data));
1031         }
1032         p->c_arg.fh = &p->o_res.fh;
1033         p->c_arg.stateid = &p->o_res.stateid;
1034         p->c_arg.seqid = p->o_arg.seqid;
1035         nfs4_init_opendata_res(p);
1036         kref_init(&p->kref);
1037         return p;
1038
1039 err_free_label:
1040         nfs4_label_free(p->f_label);
1041 err_free_p:
1042         kfree(p);
1043 err:
1044         dput(parent);
1045         return NULL;
1046 }
1047
1048 static void nfs4_opendata_free(struct kref *kref)
1049 {
1050         struct nfs4_opendata *p = container_of(kref,
1051                         struct nfs4_opendata, kref);
1052         struct super_block *sb = p->dentry->d_sb;
1053
1054         nfs_free_seqid(p->o_arg.seqid);
1055         if (p->state != NULL)
1056                 nfs4_put_open_state(p->state);
1057         nfs4_put_state_owner(p->owner);
1058
1059         nfs4_label_free(p->f_label);
1060
1061         dput(p->dir);
1062         dput(p->dentry);
1063         nfs_sb_deactive(sb);
1064         nfs_fattr_free_names(&p->f_attr);
1065         kfree(p);
1066 }
1067
1068 static void nfs4_opendata_put(struct nfs4_opendata *p)
1069 {
1070         if (p != NULL)
1071                 kref_put(&p->kref, nfs4_opendata_free);
1072 }
1073
1074 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1075 {
1076         int ret;
1077
1078         ret = rpc_wait_for_completion_task(task);
1079         return ret;
1080 }
1081
1082 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1083 {
1084         int ret = 0;
1085
1086         if (open_mode & (O_EXCL|O_TRUNC))
1087                 goto out;
1088         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1089                 case FMODE_READ:
1090                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1091                                 && state->n_rdonly != 0;
1092                         break;
1093                 case FMODE_WRITE:
1094                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1095                                 && state->n_wronly != 0;
1096                         break;
1097                 case FMODE_READ|FMODE_WRITE:
1098                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1099                                 && state->n_rdwr != 0;
1100         }
1101 out:
1102         return ret;
1103 }
1104
1105 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1106 {
1107         if (delegation == NULL)
1108                 return 0;
1109         if ((delegation->type & fmode) != fmode)
1110                 return 0;
1111         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1112                 return 0;
1113         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1114                 return 0;
1115         nfs_mark_delegation_referenced(delegation);
1116         return 1;
1117 }
1118
1119 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1120 {
1121         switch (fmode) {
1122                 case FMODE_WRITE:
1123                         state->n_wronly++;
1124                         break;
1125                 case FMODE_READ:
1126                         state->n_rdonly++;
1127                         break;
1128                 case FMODE_READ|FMODE_WRITE:
1129                         state->n_rdwr++;
1130         }
1131         nfs4_state_set_mode_locked(state, state->state | fmode);
1132 }
1133
1134 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1135 {
1136         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1137                 nfs4_stateid_copy(&state->stateid, stateid);
1138         nfs4_stateid_copy(&state->open_stateid, stateid);
1139         set_bit(NFS_OPEN_STATE, &state->flags);
1140         switch (fmode) {
1141                 case FMODE_READ:
1142                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1143                         break;
1144                 case FMODE_WRITE:
1145                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1146                         break;
1147                 case FMODE_READ|FMODE_WRITE:
1148                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1149         }
1150 }
1151
1152 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1153 {
1154         write_seqlock(&state->seqlock);
1155         nfs_set_open_stateid_locked(state, stateid, fmode);
1156         write_sequnlock(&state->seqlock);
1157 }
1158
1159 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1160 {
1161         /*
1162          * Protect the call to nfs4_state_set_mode_locked and
1163          * serialise the stateid update
1164          */
1165         write_seqlock(&state->seqlock);
1166         if (deleg_stateid != NULL) {
1167                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1168                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1169         }
1170         if (open_stateid != NULL)
1171                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1172         write_sequnlock(&state->seqlock);
1173         spin_lock(&state->owner->so_lock);
1174         update_open_stateflags(state, fmode);
1175         spin_unlock(&state->owner->so_lock);
1176 }
1177
1178 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1179 {
1180         struct nfs_inode *nfsi = NFS_I(state->inode);
1181         struct nfs_delegation *deleg_cur;
1182         int ret = 0;
1183
1184         fmode &= (FMODE_READ|FMODE_WRITE);
1185
1186         rcu_read_lock();
1187         deleg_cur = rcu_dereference(nfsi->delegation);
1188         if (deleg_cur == NULL)
1189                 goto no_delegation;
1190
1191         spin_lock(&deleg_cur->lock);
1192         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1193            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1194             (deleg_cur->type & fmode) != fmode)
1195                 goto no_delegation_unlock;
1196
1197         if (delegation == NULL)
1198                 delegation = &deleg_cur->stateid;
1199         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1200                 goto no_delegation_unlock;
1201
1202         nfs_mark_delegation_referenced(deleg_cur);
1203         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1204         ret = 1;
1205 no_delegation_unlock:
1206         spin_unlock(&deleg_cur->lock);
1207 no_delegation:
1208         rcu_read_unlock();
1209
1210         if (!ret && open_stateid != NULL) {
1211                 __update_open_stateid(state, open_stateid, NULL, fmode);
1212                 ret = 1;
1213         }
1214
1215         return ret;
1216 }
1217
1218
1219 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1220 {
1221         struct nfs_delegation *delegation;
1222
1223         rcu_read_lock();
1224         delegation = rcu_dereference(NFS_I(inode)->delegation);
1225         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1226                 rcu_read_unlock();
1227                 return;
1228         }
1229         rcu_read_unlock();
1230         nfs4_inode_return_delegation(inode);
1231 }
1232
1233 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1234 {
1235         struct nfs4_state *state = opendata->state;
1236         struct nfs_inode *nfsi = NFS_I(state->inode);
1237         struct nfs_delegation *delegation;
1238         int open_mode = opendata->o_arg.open_flags;
1239         fmode_t fmode = opendata->o_arg.fmode;
1240         nfs4_stateid stateid;
1241         int ret = -EAGAIN;
1242
1243         for (;;) {
1244                 if (can_open_cached(state, fmode, open_mode)) {
1245                         spin_lock(&state->owner->so_lock);
1246                         if (can_open_cached(state, fmode, open_mode)) {
1247                                 update_open_stateflags(state, fmode);
1248                                 spin_unlock(&state->owner->so_lock);
1249                                 goto out_return_state;
1250                         }
1251                         spin_unlock(&state->owner->so_lock);
1252                 }
1253                 rcu_read_lock();
1254                 delegation = rcu_dereference(nfsi->delegation);
1255                 if (!can_open_delegated(delegation, fmode)) {
1256                         rcu_read_unlock();
1257                         break;
1258                 }
1259                 /* Save the delegation */
1260                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1261                 rcu_read_unlock();
1262                 nfs_release_seqid(opendata->o_arg.seqid);
1263                 if (!opendata->is_recover) {
1264                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1265                         if (ret != 0)
1266                                 goto out;
1267                 }
1268                 ret = -EAGAIN;
1269
1270                 /* Try to update the stateid using the delegation */
1271                 if (update_open_stateid(state, NULL, &stateid, fmode))
1272                         goto out_return_state;
1273         }
1274 out:
1275         return ERR_PTR(ret);
1276 out_return_state:
1277         atomic_inc(&state->count);
1278         return state;
1279 }
1280
1281 static void
1282 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1283 {
1284         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1285         struct nfs_delegation *delegation;
1286         int delegation_flags = 0;
1287
1288         rcu_read_lock();
1289         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1290         if (delegation)
1291                 delegation_flags = delegation->flags;
1292         rcu_read_unlock();
1293         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1294                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1295                                    "returning a delegation for "
1296                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1297                                    clp->cl_hostname);
1298         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1299                 nfs_inode_set_delegation(state->inode,
1300                                          data->owner->so_cred,
1301                                          &data->o_res);
1302         else
1303                 nfs_inode_reclaim_delegation(state->inode,
1304                                              data->owner->so_cred,
1305                                              &data->o_res);
1306 }
1307
1308 /*
1309  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1310  * and update the nfs4_state.
1311  */
1312 static struct nfs4_state *
1313 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1314 {
1315         struct inode *inode = data->state->inode;
1316         struct nfs4_state *state = data->state;
1317         int ret;
1318
1319         if (!data->rpc_done) {
1320                 ret = data->rpc_status;
1321                 goto err;
1322         }
1323
1324         ret = -ESTALE;
1325         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1326             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1327             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1328                 goto err;
1329
1330         ret = -ENOMEM;
1331         state = nfs4_get_open_state(inode, data->owner);
1332         if (state == NULL)
1333                 goto err;
1334
1335         ret = nfs_refresh_inode(inode, &data->f_attr);
1336         if (ret)
1337                 goto err;
1338
1339         nfs_setsecurity(inode, &data->f_attr, data->f_label);
1340
1341         if (data->o_res.delegation_type != 0)
1342                 nfs4_opendata_check_deleg(data, state);
1343         update_open_stateid(state, &data->o_res.stateid, NULL,
1344                             data->o_arg.fmode);
1345
1346         return state;
1347 err:
1348         return ERR_PTR(ret);
1349
1350 }
1351
1352 static struct nfs4_state *
1353 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1354 {
1355         struct inode *inode;
1356         struct nfs4_state *state = NULL;
1357         int ret;
1358
1359         if (!data->rpc_done) {
1360                 state = nfs4_try_open_cached(data);
1361                 goto out;
1362         }
1363
1364         ret = -EAGAIN;
1365         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1366                 goto err;
1367         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1368         ret = PTR_ERR(inode);
1369         if (IS_ERR(inode))
1370                 goto err;
1371         ret = -ENOMEM;
1372         state = nfs4_get_open_state(inode, data->owner);
1373         if (state == NULL)
1374                 goto err_put_inode;
1375         if (data->o_res.delegation_type != 0)
1376                 nfs4_opendata_check_deleg(data, state);
1377         update_open_stateid(state, &data->o_res.stateid, NULL,
1378                         data->o_arg.fmode);
1379         iput(inode);
1380 out:
1381         nfs_release_seqid(data->o_arg.seqid);
1382         return state;
1383 err_put_inode:
1384         iput(inode);
1385 err:
1386         return ERR_PTR(ret);
1387 }
1388
1389 static struct nfs4_state *
1390 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1391 {
1392         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1393                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1394         return _nfs4_opendata_to_nfs4_state(data);
1395 }
1396
1397 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1398 {
1399         struct nfs_inode *nfsi = NFS_I(state->inode);
1400         struct nfs_open_context *ctx;
1401
1402         spin_lock(&state->inode->i_lock);
1403         list_for_each_entry(ctx, &nfsi->open_files, list) {
1404                 if (ctx->state != state)
1405                         continue;
1406                 get_nfs_open_context(ctx);
1407                 spin_unlock(&state->inode->i_lock);
1408                 return ctx;
1409         }
1410         spin_unlock(&state->inode->i_lock);
1411         return ERR_PTR(-ENOENT);
1412 }
1413
1414 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1415                 struct nfs4_state *state, enum open_claim_type4 claim)
1416 {
1417         struct nfs4_opendata *opendata;
1418
1419         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1420                         NULL, NULL, claim, GFP_NOFS);
1421         if (opendata == NULL)
1422                 return ERR_PTR(-ENOMEM);
1423         opendata->state = state;
1424         atomic_inc(&state->count);
1425         return opendata;
1426 }
1427
1428 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1429 {
1430         struct nfs4_state *newstate;
1431         int ret;
1432
1433         opendata->o_arg.open_flags = 0;
1434         opendata->o_arg.fmode = fmode;
1435         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1436         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1437         nfs4_init_opendata_res(opendata);
1438         ret = _nfs4_recover_proc_open(opendata);
1439         if (ret != 0)
1440                 return ret;
1441         newstate = nfs4_opendata_to_nfs4_state(opendata);
1442         if (IS_ERR(newstate))
1443                 return PTR_ERR(newstate);
1444         nfs4_close_state(newstate, fmode);
1445         *res = newstate;
1446         return 0;
1447 }
1448
1449 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1450 {
1451         struct nfs4_state *newstate;
1452         int ret;
1453
1454         /* memory barrier prior to reading state->n_* */
1455         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1456         clear_bit(NFS_OPEN_STATE, &state->flags);
1457         smp_rmb();
1458         if (state->n_rdwr != 0) {
1459                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1460                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1461                 if (ret != 0)
1462                         return ret;
1463                 if (newstate != state)
1464                         return -ESTALE;
1465         }
1466         if (state->n_wronly != 0) {
1467                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1468                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1469                 if (ret != 0)
1470                         return ret;
1471                 if (newstate != state)
1472                         return -ESTALE;
1473         }
1474         if (state->n_rdonly != 0) {
1475                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1476                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1477                 if (ret != 0)
1478                         return ret;
1479                 if (newstate != state)
1480                         return -ESTALE;
1481         }
1482         /*
1483          * We may have performed cached opens for all three recoveries.
1484          * Check if we need to update the current stateid.
1485          */
1486         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1487             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1488                 write_seqlock(&state->seqlock);
1489                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1490                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1491                 write_sequnlock(&state->seqlock);
1492         }
1493         return 0;
1494 }
1495
1496 /*
1497  * OPEN_RECLAIM:
1498  *      reclaim state on the server after a reboot.
1499  */
1500 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1501 {
1502         struct nfs_delegation *delegation;
1503         struct nfs4_opendata *opendata;
1504         fmode_t delegation_type = 0;
1505         int status;
1506
1507         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1508                         NFS4_OPEN_CLAIM_PREVIOUS);
1509         if (IS_ERR(opendata))
1510                 return PTR_ERR(opendata);
1511         rcu_read_lock();
1512         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1513         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1514                 delegation_type = delegation->type;
1515         rcu_read_unlock();
1516         opendata->o_arg.u.delegation_type = delegation_type;
1517         status = nfs4_open_recover(opendata, state);
1518         nfs4_opendata_put(opendata);
1519         return status;
1520 }
1521
1522 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1523 {
1524         struct nfs_server *server = NFS_SERVER(state->inode);
1525         struct nfs4_exception exception = { };
1526         int err;
1527         do {
1528                 err = _nfs4_do_open_reclaim(ctx, state);
1529                 trace_nfs4_open_reclaim(ctx, 0, err);
1530                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1531                         continue;
1532                 if (err != -NFS4ERR_DELAY)
1533                         break;
1534                 nfs4_handle_exception(server, err, &exception);
1535         } while (exception.retry);
1536         return err;
1537 }
1538
1539 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1540 {
1541         struct nfs_open_context *ctx;
1542         int ret;
1543
1544         ctx = nfs4_state_find_open_context(state);
1545         if (IS_ERR(ctx))
1546                 return -EAGAIN;
1547         ret = nfs4_do_open_reclaim(ctx, state);
1548         put_nfs_open_context(ctx);
1549         return ret;
1550 }
1551
1552 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1553 {
1554         switch (err) {
1555                 default:
1556                         printk(KERN_ERR "NFS: %s: unhandled error "
1557                                         "%d.\n", __func__, err);
1558                 case 0:
1559                 case -ENOENT:
1560                 case -ESTALE:
1561                         break;
1562                 case -NFS4ERR_BADSESSION:
1563                 case -NFS4ERR_BADSLOT:
1564                 case -NFS4ERR_BAD_HIGH_SLOT:
1565                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1566                 case -NFS4ERR_DEADSESSION:
1567                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1568                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1569                         return -EAGAIN;
1570                 case -NFS4ERR_STALE_CLIENTID:
1571                 case -NFS4ERR_STALE_STATEID:
1572                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1573                 case -NFS4ERR_EXPIRED:
1574                         /* Don't recall a delegation if it was lost */
1575                         nfs4_schedule_lease_recovery(server->nfs_client);
1576                         return -EAGAIN;
1577                 case -NFS4ERR_DELEG_REVOKED:
1578                 case -NFS4ERR_ADMIN_REVOKED:
1579                 case -NFS4ERR_BAD_STATEID:
1580                 case -NFS4ERR_OPENMODE:
1581                         nfs_inode_find_state_and_recover(state->inode,
1582                                         stateid);
1583                         nfs4_schedule_stateid_recovery(server, state);
1584                         return 0;
1585                 case -NFS4ERR_DELAY:
1586                 case -NFS4ERR_GRACE:
1587                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1588                         ssleep(1);
1589                         return -EAGAIN;
1590                 case -ENOMEM:
1591                 case -NFS4ERR_DENIED:
1592                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1593                         return 0;
1594         }
1595         return err;
1596 }
1597
1598 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1599 {
1600         struct nfs_server *server = NFS_SERVER(state->inode);
1601         struct nfs4_opendata *opendata;
1602         int err;
1603
1604         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1605                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1606         if (IS_ERR(opendata))
1607                 return PTR_ERR(opendata);
1608         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1609         err = nfs4_open_recover(opendata, state);
1610         nfs4_opendata_put(opendata);
1611         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1612 }
1613
1614 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1615 {
1616         struct nfs4_opendata *data = calldata;
1617
1618         nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1619                                 &data->o_res.seq_res, task);
1620 }
1621
1622 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1623 {
1624         struct nfs4_opendata *data = calldata;
1625
1626         nfs40_sequence_done(task, &data->o_res.seq_res);
1627
1628         data->rpc_status = task->tk_status;
1629         if (data->rpc_status == 0) {
1630                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1631                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1632                 renew_lease(data->o_res.server, data->timestamp);
1633                 data->rpc_done = 1;
1634         }
1635 }
1636
1637 static void nfs4_open_confirm_release(void *calldata)
1638 {
1639         struct nfs4_opendata *data = calldata;
1640         struct nfs4_state *state = NULL;
1641
1642         /* If this request hasn't been cancelled, do nothing */
1643         if (data->cancelled == 0)
1644                 goto out_free;
1645         /* In case of error, no cleanup! */
1646         if (!data->rpc_done)
1647                 goto out_free;
1648         state = nfs4_opendata_to_nfs4_state(data);
1649         if (!IS_ERR(state))
1650                 nfs4_close_state(state, data->o_arg.fmode);
1651 out_free:
1652         nfs4_opendata_put(data);
1653 }
1654
1655 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1656         .rpc_call_prepare = nfs4_open_confirm_prepare,
1657         .rpc_call_done = nfs4_open_confirm_done,
1658         .rpc_release = nfs4_open_confirm_release,
1659 };
1660
1661 /*
1662  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1663  */
1664 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1665 {
1666         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1667         struct rpc_task *task;
1668         struct  rpc_message msg = {
1669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1670                 .rpc_argp = &data->c_arg,
1671                 .rpc_resp = &data->c_res,
1672                 .rpc_cred = data->owner->so_cred,
1673         };
1674         struct rpc_task_setup task_setup_data = {
1675                 .rpc_client = server->client,
1676                 .rpc_message = &msg,
1677                 .callback_ops = &nfs4_open_confirm_ops,
1678                 .callback_data = data,
1679                 .workqueue = nfsiod_workqueue,
1680                 .flags = RPC_TASK_ASYNC,
1681         };
1682         int status;
1683
1684         nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1685         kref_get(&data->kref);
1686         data->rpc_done = 0;
1687         data->rpc_status = 0;
1688         data->timestamp = jiffies;
1689         task = rpc_run_task(&task_setup_data);
1690         if (IS_ERR(task))
1691                 return PTR_ERR(task);
1692         status = nfs4_wait_for_completion_rpc_task(task);
1693         if (status != 0) {
1694                 data->cancelled = 1;
1695                 smp_wmb();
1696         } else
1697                 status = data->rpc_status;
1698         rpc_put_task(task);
1699         return status;
1700 }
1701
1702 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1703 {
1704         struct nfs4_opendata *data = calldata;
1705         struct nfs4_state_owner *sp = data->owner;
1706         struct nfs_client *clp = sp->so_server->nfs_client;
1707
1708         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1709                 goto out_wait;
1710         /*
1711          * Check if we still need to send an OPEN call, or if we can use
1712          * a delegation instead.
1713          */
1714         if (data->state != NULL) {
1715                 struct nfs_delegation *delegation;
1716
1717                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1718                         goto out_no_action;
1719                 rcu_read_lock();
1720                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1721                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1722                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1723                     can_open_delegated(delegation, data->o_arg.fmode))
1724                         goto unlock_no_action;
1725                 rcu_read_unlock();
1726         }
1727         /* Update client id. */
1728         data->o_arg.clientid = clp->cl_clientid;
1729         switch (data->o_arg.claim) {
1730         case NFS4_OPEN_CLAIM_PREVIOUS:
1731         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1732         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1733                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1734         case NFS4_OPEN_CLAIM_FH:
1735                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1736                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1737         }
1738         data->timestamp = jiffies;
1739         if (nfs4_setup_sequence(data->o_arg.server,
1740                                 &data->o_arg.seq_args,
1741                                 &data->o_res.seq_res,
1742                                 task) != 0)
1743                 nfs_release_seqid(data->o_arg.seqid);
1744
1745         /* Set the create mode (note dependency on the session type) */
1746         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1747         if (data->o_arg.open_flags & O_EXCL) {
1748                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1749                 if (nfs4_has_persistent_session(clp))
1750                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1751                 else if (clp->cl_mvops->minor_version > 0)
1752                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1753         }
1754         return;
1755 unlock_no_action:
1756         rcu_read_unlock();
1757 out_no_action:
1758         task->tk_action = NULL;
1759 out_wait:
1760         nfs4_sequence_done(task, &data->o_res.seq_res);
1761 }
1762
1763 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1764 {
1765         struct nfs4_opendata *data = calldata;
1766
1767         data->rpc_status = task->tk_status;
1768
1769         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1770                 return;
1771
1772         if (task->tk_status == 0) {
1773                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1774                         switch (data->o_res.f_attr->mode & S_IFMT) {
1775                         case S_IFREG:
1776                                 break;
1777                         case S_IFLNK:
1778                                 data->rpc_status = -ELOOP;
1779                                 break;
1780                         case S_IFDIR:
1781                                 data->rpc_status = -EISDIR;
1782                                 break;
1783                         default:
1784                                 data->rpc_status = -ENOTDIR;
1785                         }
1786                 }
1787                 renew_lease(data->o_res.server, data->timestamp);
1788                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1789                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1790         }
1791         data->rpc_done = 1;
1792 }
1793
1794 static void nfs4_open_release(void *calldata)
1795 {
1796         struct nfs4_opendata *data = calldata;
1797         struct nfs4_state *state = NULL;
1798
1799         /* If this request hasn't been cancelled, do nothing */
1800         if (data->cancelled == 0)
1801                 goto out_free;
1802         /* In case of error, no cleanup! */
1803         if (data->rpc_status != 0 || !data->rpc_done)
1804                 goto out_free;
1805         /* In case we need an open_confirm, no cleanup! */
1806         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1807                 goto out_free;
1808         state = nfs4_opendata_to_nfs4_state(data);
1809         if (!IS_ERR(state))
1810                 nfs4_close_state(state, data->o_arg.fmode);
1811 out_free:
1812         nfs4_opendata_put(data);
1813 }
1814
1815 static const struct rpc_call_ops nfs4_open_ops = {
1816         .rpc_call_prepare = nfs4_open_prepare,
1817         .rpc_call_done = nfs4_open_done,
1818         .rpc_release = nfs4_open_release,
1819 };
1820
1821 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1822 {
1823         struct inode *dir = data->dir->d_inode;
1824         struct nfs_server *server = NFS_SERVER(dir);
1825         struct nfs_openargs *o_arg = &data->o_arg;
1826         struct nfs_openres *o_res = &data->o_res;
1827         struct rpc_task *task;
1828         struct rpc_message msg = {
1829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1830                 .rpc_argp = o_arg,
1831                 .rpc_resp = o_res,
1832                 .rpc_cred = data->owner->so_cred,
1833         };
1834         struct rpc_task_setup task_setup_data = {
1835                 .rpc_client = server->client,
1836                 .rpc_message = &msg,
1837                 .callback_ops = &nfs4_open_ops,
1838                 .callback_data = data,
1839                 .workqueue = nfsiod_workqueue,
1840                 .flags = RPC_TASK_ASYNC,
1841         };
1842         int status;
1843
1844         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1845         kref_get(&data->kref);
1846         data->rpc_done = 0;
1847         data->rpc_status = 0;
1848         data->cancelled = 0;
1849         data->is_recover = 0;
1850         if (isrecover) {
1851                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1852                 data->is_recover = 1;
1853         }
1854         task = rpc_run_task(&task_setup_data);
1855         if (IS_ERR(task))
1856                 return PTR_ERR(task);
1857         status = nfs4_wait_for_completion_rpc_task(task);
1858         if (status != 0) {
1859                 data->cancelled = 1;
1860                 smp_wmb();
1861         } else
1862                 status = data->rpc_status;
1863         rpc_put_task(task);
1864
1865         return status;
1866 }
1867
1868 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1869 {
1870         struct inode *dir = data->dir->d_inode;
1871         struct nfs_openres *o_res = &data->o_res;
1872         int status;
1873
1874         status = nfs4_run_open_task(data, 1);
1875         if (status != 0 || !data->rpc_done)
1876                 return status;
1877
1878         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1879
1880         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1881                 status = _nfs4_proc_open_confirm(data);
1882                 if (status != 0)
1883                         return status;
1884         }
1885
1886         return status;
1887 }
1888
1889 static int nfs4_opendata_access(struct rpc_cred *cred,
1890                                 struct nfs4_opendata *opendata,
1891                                 struct nfs4_state *state, fmode_t fmode,
1892                                 int openflags)
1893 {
1894         struct nfs_access_entry cache;
1895         u32 mask;
1896
1897         /* access call failed or for some reason the server doesn't
1898          * support any access modes -- defer access call until later */
1899         if (opendata->o_res.access_supported == 0)
1900                 return 0;
1901
1902         mask = 0;
1903         /* don't check MAY_WRITE - a newly created file may not have
1904          * write mode bits, but POSIX allows the creating process to write.
1905          * use openflags to check for exec, because fmode won't
1906          * always have FMODE_EXEC set when file open for exec. */
1907         if (openflags & __FMODE_EXEC) {
1908                 /* ONLY check for exec rights */
1909                 mask = MAY_EXEC;
1910         } else if (fmode & FMODE_READ)
1911                 mask = MAY_READ;
1912
1913         cache.cred = cred;
1914         cache.jiffies = jiffies;
1915         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1916         nfs_access_add_cache(state->inode, &cache);
1917
1918         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1919                 return 0;
1920
1921         /* even though OPEN succeeded, access is denied. Close the file */
1922         nfs4_close_state(state, fmode);
1923         return -EACCES;
1924 }
1925
1926 /*
1927  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1928  */
1929 static int _nfs4_proc_open(struct nfs4_opendata *data)
1930 {
1931         struct inode *dir = data->dir->d_inode;
1932         struct nfs_server *server = NFS_SERVER(dir);
1933         struct nfs_openargs *o_arg = &data->o_arg;
1934         struct nfs_openres *o_res = &data->o_res;
1935         int status;
1936
1937         status = nfs4_run_open_task(data, 0);
1938         if (!data->rpc_done)
1939                 return status;
1940         if (status != 0) {
1941                 if (status == -NFS4ERR_BADNAME &&
1942                                 !(o_arg->open_flags & O_CREAT))
1943                         return -ENOENT;
1944                 return status;
1945         }
1946
1947         nfs_fattr_map_and_free_names(server, &data->f_attr);
1948
1949         if (o_arg->open_flags & O_CREAT)
1950                 update_changeattr(dir, &o_res->cinfo);
1951         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1952                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1953         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1954                 status = _nfs4_proc_open_confirm(data);
1955                 if (status != 0)
1956                         return status;
1957         }
1958         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1959                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1960         return 0;
1961 }
1962
1963 static int nfs4_recover_expired_lease(struct nfs_server *server)
1964 {
1965         return nfs4_client_recover_expired_lease(server->nfs_client);
1966 }
1967
1968 /*
1969  * OPEN_EXPIRED:
1970  *      reclaim state on the server after a network partition.
1971  *      Assumes caller holds the appropriate lock
1972  */
1973 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1974 {
1975         struct nfs4_opendata *opendata;
1976         int ret;
1977
1978         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1979                         NFS4_OPEN_CLAIM_FH);
1980         if (IS_ERR(opendata))
1981                 return PTR_ERR(opendata);
1982         ret = nfs4_open_recover(opendata, state);
1983         if (ret == -ESTALE)
1984                 d_drop(ctx->dentry);
1985         nfs4_opendata_put(opendata);
1986         return ret;
1987 }
1988
1989 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1990 {
1991         struct nfs_server *server = NFS_SERVER(state->inode);
1992         struct nfs4_exception exception = { };
1993         int err;
1994
1995         do {
1996                 err = _nfs4_open_expired(ctx, state);
1997                 trace_nfs4_open_expired(ctx, 0, err);
1998                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1999                         continue;
2000                 switch (err) {
2001                 default:
2002                         goto out;
2003                 case -NFS4ERR_GRACE:
2004                 case -NFS4ERR_DELAY:
2005                         nfs4_handle_exception(server, err, &exception);
2006                         err = 0;
2007                 }
2008         } while (exception.retry);
2009 out:
2010         return err;
2011 }
2012
2013 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2014 {
2015         struct nfs_open_context *ctx;
2016         int ret;
2017
2018         ctx = nfs4_state_find_open_context(state);
2019         if (IS_ERR(ctx))
2020                 return -EAGAIN;
2021         ret = nfs4_do_open_expired(ctx, state);
2022         put_nfs_open_context(ctx);
2023         return ret;
2024 }
2025
2026 #if defined(CONFIG_NFS_V4_1)
2027 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2028 {
2029         struct nfs_server *server = NFS_SERVER(state->inode);
2030         nfs4_stateid *stateid = &state->stateid;
2031         struct nfs_delegation *delegation;
2032         struct rpc_cred *cred = NULL;
2033         int status = -NFS4ERR_BAD_STATEID;
2034
2035         /* If a state reset has been done, test_stateid is unneeded */
2036         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2037                 return;
2038
2039         /* Get the delegation credential for use by test/free_stateid */
2040         rcu_read_lock();
2041         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2042         if (delegation != NULL &&
2043             nfs4_stateid_match(&delegation->stateid, stateid)) {
2044                 cred = get_rpccred(delegation->cred);
2045                 rcu_read_unlock();
2046                 status = nfs41_test_stateid(server, stateid, cred);
2047                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2048         } else
2049                 rcu_read_unlock();
2050
2051         if (status != NFS_OK) {
2052                 /* Free the stateid unless the server explicitly
2053                  * informs us the stateid is unrecognized. */
2054                 if (status != -NFS4ERR_BAD_STATEID)
2055                         nfs41_free_stateid(server, stateid, cred);
2056                 nfs_remove_bad_delegation(state->inode);
2057
2058                 write_seqlock(&state->seqlock);
2059                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2060                 write_sequnlock(&state->seqlock);
2061                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2062         }
2063
2064         if (cred != NULL)
2065                 put_rpccred(cred);
2066 }
2067
2068 /**
2069  * nfs41_check_open_stateid - possibly free an open stateid
2070  *
2071  * @state: NFSv4 state for an inode
2072  *
2073  * Returns NFS_OK if recovery for this stateid is now finished.
2074  * Otherwise a negative NFS4ERR value is returned.
2075  */
2076 static int nfs41_check_open_stateid(struct nfs4_state *state)
2077 {
2078         struct nfs_server *server = NFS_SERVER(state->inode);
2079         nfs4_stateid *stateid = &state->open_stateid;
2080         struct rpc_cred *cred = state->owner->so_cred;
2081         int status;
2082
2083         /* If a state reset has been done, test_stateid is unneeded */
2084         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2085             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2086             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2087                 return -NFS4ERR_BAD_STATEID;
2088
2089         status = nfs41_test_stateid(server, stateid, cred);
2090         trace_nfs4_test_open_stateid(state, NULL, status);
2091         if (status != NFS_OK) {
2092                 /* Free the stateid unless the server explicitly
2093                  * informs us the stateid is unrecognized. */
2094                 if (status != -NFS4ERR_BAD_STATEID)
2095                         nfs41_free_stateid(server, stateid, cred);
2096
2097                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2098                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2099                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2100                 clear_bit(NFS_OPEN_STATE, &state->flags);
2101         }
2102         return status;
2103 }
2104
2105 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2106 {
2107         int status;
2108
2109         nfs41_clear_delegation_stateid(state);
2110         status = nfs41_check_open_stateid(state);
2111         if (status != NFS_OK)
2112                 status = nfs4_open_expired(sp, state);
2113         return status;
2114 }
2115 #endif
2116
2117 /*
2118  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2119  * fields corresponding to attributes that were used to store the verifier.
2120  * Make sure we clobber those fields in the later setattr call
2121  */
2122 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2123 {
2124         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2125             !(sattr->ia_valid & ATTR_ATIME_SET))
2126                 sattr->ia_valid |= ATTR_ATIME;
2127
2128         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2129             !(sattr->ia_valid & ATTR_MTIME_SET))
2130                 sattr->ia_valid |= ATTR_MTIME;
2131 }
2132
2133 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2134                 fmode_t fmode,
2135                 int flags,
2136                 struct nfs_open_context *ctx)
2137 {
2138         struct nfs4_state_owner *sp = opendata->owner;
2139         struct nfs_server *server = sp->so_server;
2140         struct dentry *dentry;
2141         struct nfs4_state *state;
2142         unsigned int seq;
2143         int ret;
2144
2145         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2146
2147         ret = _nfs4_proc_open(opendata);
2148         if (ret != 0)
2149                 goto out;
2150
2151         state = nfs4_opendata_to_nfs4_state(opendata);
2152         ret = PTR_ERR(state);
2153         if (IS_ERR(state))
2154                 goto out;
2155         if (server->caps & NFS_CAP_POSIX_LOCK)
2156                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2157
2158         dentry = opendata->dentry;
2159         if (dentry->d_inode == NULL) {
2160                 /* FIXME: Is this d_drop() ever needed? */
2161                 d_drop(dentry);
2162                 dentry = d_add_unique(dentry, igrab(state->inode));
2163                 if (dentry == NULL) {
2164                         dentry = opendata->dentry;
2165                 } else if (dentry != ctx->dentry) {
2166                         dput(ctx->dentry);
2167                         ctx->dentry = dget(dentry);
2168                 }
2169                 nfs_set_verifier(dentry,
2170                                 nfs_save_change_attribute(opendata->dir->d_inode));
2171         }
2172
2173         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2174         if (ret != 0)
2175                 goto out;
2176
2177         ctx->state = state;
2178         if (dentry->d_inode == state->inode) {
2179                 nfs_inode_attach_open_context(ctx);
2180                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2181                         nfs4_schedule_stateid_recovery(server, state);
2182         }
2183 out:
2184         return ret;
2185 }
2186
2187 /*
2188  * Returns a referenced nfs4_state
2189  */
2190 static int _nfs4_do_open(struct inode *dir,
2191                         struct nfs_open_context *ctx,
2192                         int flags,
2193                         struct iattr *sattr,
2194                         struct nfs4_label *label)
2195 {
2196         struct nfs4_state_owner  *sp;
2197         struct nfs4_state     *state = NULL;
2198         struct nfs_server       *server = NFS_SERVER(dir);
2199         struct nfs4_opendata *opendata;
2200         struct dentry *dentry = ctx->dentry;
2201         struct rpc_cred *cred = ctx->cred;
2202         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2203         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2204         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2205         struct nfs4_label *olabel = NULL;
2206         int status;
2207
2208         /* Protect against reboot recovery conflicts */
2209         status = -ENOMEM;
2210         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2211         if (sp == NULL) {
2212                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2213                 goto out_err;
2214         }
2215         status = nfs4_recover_expired_lease(server);
2216         if (status != 0)
2217                 goto err_put_state_owner;
2218         if (dentry->d_inode != NULL)
2219                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2220         status = -ENOMEM;
2221         if (dentry->d_inode)
2222                 claim = NFS4_OPEN_CLAIM_FH;
2223         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2224                         label, claim, GFP_KERNEL);
2225         if (opendata == NULL)
2226                 goto err_put_state_owner;
2227
2228         if (label) {
2229                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2230                 if (IS_ERR(olabel)) {
2231                         status = PTR_ERR(olabel);
2232                         goto err_opendata_put;
2233                 }
2234         }
2235
2236         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2237                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2238                 if (!opendata->f_attr.mdsthreshold)
2239                         goto err_free_label;
2240                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2241         }
2242         if (dentry->d_inode != NULL)
2243                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2244
2245         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2246         if (status != 0)
2247                 goto err_free_label;
2248         state = ctx->state;
2249
2250         if ((opendata->o_arg.open_flags & O_EXCL) &&
2251             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2252                 nfs4_exclusive_attrset(opendata, sattr);
2253
2254                 nfs_fattr_init(opendata->o_res.f_attr);
2255                 status = nfs4_do_setattr(state->inode, cred,
2256                                 opendata->o_res.f_attr, sattr,
2257                                 state, label, olabel);
2258                 if (status == 0) {
2259                         nfs_setattr_update_inode(state->inode, sattr);
2260                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2261                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2262                 }
2263         }
2264
2265         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2266                 *ctx_th = opendata->f_attr.mdsthreshold;
2267         else
2268                 kfree(opendata->f_attr.mdsthreshold);
2269         opendata->f_attr.mdsthreshold = NULL;
2270
2271         nfs4_label_free(olabel);
2272
2273         nfs4_opendata_put(opendata);
2274         nfs4_put_state_owner(sp);
2275         return 0;
2276 err_free_label:
2277         nfs4_label_free(olabel);
2278 err_opendata_put:
2279         kfree(opendata->f_attr.mdsthreshold);
2280         nfs4_opendata_put(opendata);
2281 err_put_state_owner:
2282         nfs4_put_state_owner(sp);
2283 out_err:
2284         return status;
2285 }
2286
2287
2288 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2289                                         struct nfs_open_context *ctx,
2290                                         int flags,
2291                                         struct iattr *sattr,
2292                                         struct nfs4_label *label)
2293 {
2294         struct nfs_server *server = NFS_SERVER(dir);
2295         struct nfs4_exception exception = { };
2296         struct nfs4_state *res;
2297         int status;
2298
2299         do {
2300                 status = _nfs4_do_open(dir, ctx, flags, sattr, label);
2301                 res = ctx->state;
2302                 trace_nfs4_open_file(ctx, flags, status);
2303                 if (status == 0)
2304                         break;
2305                 /* NOTE: BAD_SEQID means the server and client disagree about the
2306                  * book-keeping w.r.t. state-changing operations
2307                  * (OPEN/CLOSE/LOCK/LOCKU...)
2308                  * It is actually a sign of a bug on the client or on the server.
2309                  *
2310                  * If we receive a BAD_SEQID error in the particular case of
2311                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2312                  * have unhashed the old state_owner for us, and that we can
2313                  * therefore safely retry using a new one. We should still warn
2314                  * the user though...
2315                  */
2316                 if (status == -NFS4ERR_BAD_SEQID) {
2317                         pr_warn_ratelimited("NFS: v4 server %s "
2318                                         " returned a bad sequence-id error!\n",
2319                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2320                         exception.retry = 1;
2321                         continue;
2322                 }
2323                 /*
2324                  * BAD_STATEID on OPEN means that the server cancelled our
2325                  * state before it received the OPEN_CONFIRM.
2326                  * Recover by retrying the request as per the discussion
2327                  * on Page 181 of RFC3530.
2328                  */
2329                 if (status == -NFS4ERR_BAD_STATEID) {
2330                         exception.retry = 1;
2331                         continue;
2332                 }
2333                 if (status == -EAGAIN) {
2334                         /* We must have found a delegation */
2335                         exception.retry = 1;
2336                         continue;
2337                 }
2338                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2339                         continue;
2340                 res = ERR_PTR(nfs4_handle_exception(server,
2341                                         status, &exception));
2342         } while (exception.retry);
2343         return res;
2344 }
2345
2346 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2347                             struct nfs_fattr *fattr, struct iattr *sattr,
2348                             struct nfs4_state *state, struct nfs4_label *ilabel,
2349                             struct nfs4_label *olabel)
2350 {
2351         struct nfs_server *server = NFS_SERVER(inode);
2352         struct nfs_setattrargs  arg = {
2353                 .fh             = NFS_FH(inode),
2354                 .iap            = sattr,
2355                 .server         = server,
2356                 .bitmask = server->attr_bitmask,
2357                 .label          = ilabel,
2358         };
2359         struct nfs_setattrres  res = {
2360                 .fattr          = fattr,
2361                 .label          = olabel,
2362                 .server         = server,
2363         };
2364         struct rpc_message msg = {
2365                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2366                 .rpc_argp       = &arg,
2367                 .rpc_resp       = &res,
2368                 .rpc_cred       = cred,
2369         };
2370         unsigned long timestamp = jiffies;
2371         fmode_t fmode;
2372         bool truncate;
2373         int status;
2374
2375         arg.bitmask = nfs4_bitmask(server, ilabel);
2376         if (ilabel)
2377                 arg.bitmask = nfs4_bitmask(server, olabel);
2378
2379         nfs_fattr_init(fattr);
2380
2381         /* Servers should only apply open mode checks for file size changes */
2382         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2383         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2384
2385         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2386                 /* Use that stateid */
2387         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2388                 struct nfs_lockowner lockowner = {
2389                         .l_owner = current->files,
2390                         .l_pid = current->tgid,
2391                 };
2392                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2393                                 &lockowner);
2394         } else
2395                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2396
2397         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2398         if (status == 0 && state != NULL)
2399                 renew_lease(server, timestamp);
2400         return status;
2401 }
2402
2403 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2404                            struct nfs_fattr *fattr, struct iattr *sattr,
2405                            struct nfs4_state *state, struct nfs4_label *ilabel,
2406                            struct nfs4_label *olabel)
2407 {
2408         struct nfs_server *server = NFS_SERVER(inode);
2409         struct nfs4_exception exception = {
2410                 .state = state,
2411                 .inode = inode,
2412         };
2413         int err;
2414         do {
2415                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2416                 trace_nfs4_setattr(inode, err);
2417                 switch (err) {
2418                 case -NFS4ERR_OPENMODE:
2419                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2420                                 pr_warn_once("NFSv4: server %s is incorrectly "
2421                                                 "applying open mode checks to "
2422                                                 "a SETATTR that is not "
2423                                                 "changing file size.\n",
2424                                                 server->nfs_client->cl_hostname);
2425                         }
2426                         if (state && !(state->state & FMODE_WRITE)) {
2427                                 err = -EBADF;
2428                                 if (sattr->ia_valid & ATTR_OPEN)
2429                                         err = -EACCES;
2430                                 goto out;
2431                         }
2432                 }
2433                 err = nfs4_handle_exception(server, err, &exception);
2434         } while (exception.retry);
2435 out:
2436         return err;
2437 }
2438
2439 struct nfs4_closedata {
2440         struct inode *inode;
2441         struct nfs4_state *state;
2442         struct nfs_closeargs arg;
2443         struct nfs_closeres res;
2444         struct nfs_fattr fattr;
2445         unsigned long timestamp;
2446         bool roc;
2447         u32 roc_barrier;
2448 };
2449
2450 static void nfs4_free_closedata(void *data)
2451 {
2452         struct nfs4_closedata *calldata = data;
2453         struct nfs4_state_owner *sp = calldata->state->owner;
2454         struct super_block *sb = calldata->state->inode->i_sb;
2455
2456         if (calldata->roc)
2457                 pnfs_roc_release(calldata->state->inode);
2458         nfs4_put_open_state(calldata->state);
2459         nfs_free_seqid(calldata->arg.seqid);
2460         nfs4_put_state_owner(sp);
2461         nfs_sb_deactive(sb);
2462         kfree(calldata);
2463 }
2464
2465 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2466                 fmode_t fmode)
2467 {
2468         spin_lock(&state->owner->so_lock);
2469         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2470         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2471         case FMODE_WRITE:
2472                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2473                 break;
2474         case FMODE_READ:
2475                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2476                 break;
2477         case 0:
2478                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2479                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2480                 clear_bit(NFS_OPEN_STATE, &state->flags);
2481         }
2482         spin_unlock(&state->owner->so_lock);
2483 }
2484
2485 static void nfs4_close_done(struct rpc_task *task, void *data)
2486 {
2487         struct nfs4_closedata *calldata = data;
2488         struct nfs4_state *state = calldata->state;
2489         struct nfs_server *server = NFS_SERVER(calldata->inode);
2490
2491         dprintk("%s: begin!\n", __func__);
2492         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2493                 return;
2494         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2495         /* hmm. we are done with the inode, and in the process of freeing
2496          * the state_owner. we keep this around to process errors
2497          */
2498         switch (task->tk_status) {
2499                 case 0:
2500                         if (calldata->roc)
2501                                 pnfs_roc_set_barrier(state->inode,
2502                                                      calldata->roc_barrier);
2503                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2504                         renew_lease(server, calldata->timestamp);
2505                         nfs4_close_clear_stateid_flags(state,
2506                                         calldata->arg.fmode);
2507                         break;
2508                 case -NFS4ERR_STALE_STATEID:
2509                 case -NFS4ERR_OLD_STATEID:
2510                 case -NFS4ERR_BAD_STATEID:
2511                 case -NFS4ERR_EXPIRED:
2512                         if (calldata->arg.fmode == 0)
2513                                 break;
2514                 default:
2515                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2516                                 rpc_restart_call_prepare(task);
2517         }
2518         nfs_release_seqid(calldata->arg.seqid);
2519         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2520         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2521 }
2522
2523 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2524 {
2525         struct nfs4_closedata *calldata = data;
2526         struct nfs4_state *state = calldata->state;
2527         struct inode *inode = calldata->inode;
2528         int call_close = 0;
2529
2530         dprintk("%s: begin!\n", __func__);
2531         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2532                 goto out_wait;
2533
2534         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2535         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2536         spin_lock(&state->owner->so_lock);
2537         /* Calculate the change in open mode */
2538         if (state->n_rdwr == 0) {
2539                 if (state->n_rdonly == 0) {
2540                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2541                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2542                         calldata->arg.fmode &= ~FMODE_READ;
2543                 }
2544                 if (state->n_wronly == 0) {
2545                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2546                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2547                         calldata->arg.fmode &= ~FMODE_WRITE;
2548                 }
2549         }
2550         if (!nfs4_valid_open_stateid(state))
2551                 call_close = 0;
2552         spin_unlock(&state->owner->so_lock);
2553
2554         if (!call_close) {
2555                 /* Note: exit _without_ calling nfs4_close_done */
2556                 goto out_no_action;
2557         }
2558
2559         if (calldata->arg.fmode == 0) {
2560                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2561                 if (calldata->roc &&
2562                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2563                         nfs_release_seqid(calldata->arg.seqid);
2564                         goto out_wait;
2565                     }
2566         }
2567
2568         nfs_fattr_init(calldata->res.fattr);
2569         calldata->timestamp = jiffies;
2570         if (nfs4_setup_sequence(NFS_SERVER(inode),
2571                                 &calldata->arg.seq_args,
2572                                 &calldata->res.seq_res,
2573                                 task) != 0)
2574                 nfs_release_seqid(calldata->arg.seqid);
2575         dprintk("%s: done!\n", __func__);
2576         return;
2577 out_no_action:
2578         task->tk_action = NULL;
2579 out_wait:
2580         nfs4_sequence_done(task, &calldata->res.seq_res);
2581 }
2582
2583 static const struct rpc_call_ops nfs4_close_ops = {
2584         .rpc_call_prepare = nfs4_close_prepare,
2585         .rpc_call_done = nfs4_close_done,
2586         .rpc_release = nfs4_free_closedata,
2587 };
2588
2589 /*
2590  * It is possible for data to be read/written from a mem-mapped file
2591  * after the sys_close call (which hits the vfs layer as a flush).
2592  * This means that we can't safely call nfsv4 close on a file until
2593  * the inode is cleared. This in turn means that we are not good
2594  * NFSv4 citizens - we do not indicate to the server to update the file's
2595  * share state even when we are done with one of the three share
2596  * stateid's in the inode.
2597  *
2598  * NOTE: Caller must be holding the sp->so_owner semaphore!
2599  */
2600 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2601 {
2602         struct nfs_server *server = NFS_SERVER(state->inode);
2603         struct nfs4_closedata *calldata;
2604         struct nfs4_state_owner *sp = state->owner;
2605         struct rpc_task *task;
2606         struct rpc_message msg = {
2607                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2608                 .rpc_cred = state->owner->so_cred,
2609         };
2610         struct rpc_task_setup task_setup_data = {
2611                 .rpc_client = server->client,
2612                 .rpc_message = &msg,
2613                 .callback_ops = &nfs4_close_ops,
2614                 .workqueue = nfsiod_workqueue,
2615                 .flags = RPC_TASK_ASYNC,
2616         };
2617         int status = -ENOMEM;
2618
2619         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2620                 &task_setup_data.rpc_client, &msg);
2621
2622         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2623         if (calldata == NULL)
2624                 goto out;
2625         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2626         calldata->inode = state->inode;
2627         calldata->state = state;
2628         calldata->arg.fh = NFS_FH(state->inode);
2629         calldata->arg.stateid = &state->open_stateid;
2630         /* Serialization for the sequence id */
2631         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2632         if (calldata->arg.seqid == NULL)
2633                 goto out_free_calldata;
2634         calldata->arg.fmode = 0;
2635         calldata->arg.bitmask = server->cache_consistency_bitmask;
2636         calldata->res.fattr = &calldata->fattr;
2637         calldata->res.seqid = calldata->arg.seqid;
2638         calldata->res.server = server;
2639         calldata->roc = pnfs_roc(state->inode);
2640         nfs_sb_active(calldata->inode->i_sb);
2641
2642         msg.rpc_argp = &calldata->arg;
2643         msg.rpc_resp = &calldata->res;
2644         task_setup_data.callback_data = calldata;
2645         task = rpc_run_task(&task_setup_data);
2646         if (IS_ERR(task))
2647                 return PTR_ERR(task);
2648         status = 0;
2649         if (wait)
2650                 status = rpc_wait_for_completion_task(task);
2651         rpc_put_task(task);
2652         return status;
2653 out_free_calldata:
2654         kfree(calldata);
2655 out:
2656         nfs4_put_open_state(state);
2657         nfs4_put_state_owner(sp);
2658         return status;
2659 }
2660
2661 static struct inode *
2662 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2663 {
2664         struct nfs4_state *state;
2665         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2666
2667         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2668
2669         /* Protect against concurrent sillydeletes */
2670         state = nfs4_do_open(dir, ctx, open_flags, attr, label);
2671
2672         nfs4_label_release_security(label);
2673
2674         if (IS_ERR(state))
2675                 return ERR_CAST(state);
2676         return state->inode;
2677 }
2678
2679 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2680 {
2681         if (ctx->state == NULL)
2682                 return;
2683         if (is_sync)
2684                 nfs4_close_sync(ctx->state, ctx->mode);
2685         else
2686                 nfs4_close_state(ctx->state, ctx->mode);
2687 }
2688
2689 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2690 {
2691         struct nfs4_server_caps_arg args = {
2692                 .fhandle = fhandle,
2693         };
2694         struct nfs4_server_caps_res res = {};
2695         struct rpc_message msg = {
2696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2697                 .rpc_argp = &args,
2698                 .rpc_resp = &res,
2699         };
2700         int status;
2701
2702         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2703         if (status == 0) {
2704                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2705                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2706                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2707                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2708                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2709                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2710                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2711                         server->caps |= NFS_CAP_ACLS;
2712                 if (res.has_links != 0)
2713                         server->caps |= NFS_CAP_HARDLINKS;
2714                 if (res.has_symlinks != 0)
2715                         server->caps |= NFS_CAP_SYMLINKS;
2716                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2717                         server->caps |= NFS_CAP_FILEID;
2718                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2719                         server->caps |= NFS_CAP_MODE;
2720                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2721                         server->caps |= NFS_CAP_NLINK;
2722                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2723                         server->caps |= NFS_CAP_OWNER;
2724                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2725                         server->caps |= NFS_CAP_OWNER_GROUP;
2726                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2727                         server->caps |= NFS_CAP_ATIME;
2728                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2729                         server->caps |= NFS_CAP_CTIME;
2730                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2731                         server->caps |= NFS_CAP_MTIME;
2732 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2733                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2734                         server->caps |= NFS_CAP_SECURITY_LABEL;
2735 #endif
2736                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2737                                 sizeof(server->attr_bitmask));
2738
2739                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2740                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2741                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2742                 }
2743                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2744                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2745                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2746                 server->acl_bitmask = res.acl_bitmask;
2747                 server->fh_expire_type = res.fh_expire_type;
2748         }
2749
2750         return status;
2751 }
2752
2753 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2754 {
2755         struct nfs4_exception exception = { };
2756         int err;
2757         do {
2758                 err = nfs4_handle_exception(server,
2759                                 _nfs4_server_capabilities(server, fhandle),
2760                                 &exception);
2761         } while (exception.retry);
2762         return err;
2763 }
2764
2765 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2766                 struct nfs_fsinfo *info)
2767 {
2768         u32 bitmask[3];
2769         struct nfs4_lookup_root_arg args = {
2770                 .bitmask = bitmask,
2771         };
2772         struct nfs4_lookup_res res = {
2773                 .server = server,
2774                 .fattr = info->fattr,
2775                 .fh = fhandle,
2776         };
2777         struct rpc_message msg = {
2778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2779                 .rpc_argp = &args,
2780                 .rpc_resp = &res,
2781         };
2782
2783         bitmask[0] = nfs4_fattr_bitmap[0];
2784         bitmask[1] = nfs4_fattr_bitmap[1];
2785         /*
2786          * Process the label in the upcoming getfattr
2787          */
2788         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2789
2790         nfs_fattr_init(info->fattr);
2791         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2792 }
2793
2794 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2795                 struct nfs_fsinfo *info)
2796 {
2797         struct nfs4_exception exception = { };
2798         int err;
2799         do {
2800                 err = _nfs4_lookup_root(server, fhandle, info);
2801                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2802                 switch (err) {
2803                 case 0:
2804                 case -NFS4ERR_WRONGSEC:
2805                         goto out;
2806                 default:
2807                         err = nfs4_handle_exception(server, err, &exception);
2808                 }
2809         } while (exception.retry);
2810 out:
2811         return err;
2812 }
2813
2814 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2815                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2816 {
2817         struct rpc_auth_create_args auth_args = {
2818                 .pseudoflavor = flavor,
2819         };
2820         struct rpc_auth *auth;
2821         int ret;
2822
2823         auth = rpcauth_create(&auth_args, server->client);
2824         if (IS_ERR(auth)) {
2825                 ret = -EACCES;
2826                 goto out;
2827         }
2828         ret = nfs4_lookup_root(server, fhandle, info);
2829 out:
2830         return ret;
2831 }
2832
2833 /*
2834  * Retry pseudoroot lookup with various security flavors.  We do this when:
2835  *
2836  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2837  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2838  *
2839  * Returns zero on success, or a negative NFS4ERR value, or a
2840  * negative errno value.
2841  */
2842 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2843                               struct nfs_fsinfo *info)
2844 {
2845         /* Per 3530bis 15.33.5 */
2846         static const rpc_authflavor_t flav_array[] = {
2847                 RPC_AUTH_GSS_KRB5P,
2848                 RPC_AUTH_GSS_KRB5I,
2849                 RPC_AUTH_GSS_KRB5,
2850                 RPC_AUTH_UNIX,                  /* courtesy */
2851                 RPC_AUTH_NULL,
2852         };
2853         int status = -EPERM;
2854         size_t i;
2855
2856         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2857                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2858                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2859                         continue;
2860                 break;
2861         }
2862
2863         /*
2864          * -EACCESS could mean that the user doesn't have correct permissions
2865          * to access the mount.  It could also mean that we tried to mount
2866          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2867          * existing mount programs don't handle -EACCES very well so it should
2868          * be mapped to -EPERM instead.
2869          */
2870         if (status == -EACCES)
2871                 status = -EPERM;
2872         return status;
2873 }
2874
2875 static int nfs4_do_find_root_sec(struct nfs_server *server,
2876                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2877 {
2878         int mv = server->nfs_client->cl_minorversion;
2879         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2880 }
2881
2882 /**
2883  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2884  * @server: initialized nfs_server handle
2885  * @fhandle: we fill in the pseudo-fs root file handle
2886  * @info: we fill in an FSINFO struct
2887  * @auth_probe: probe the auth flavours
2888  *
2889  * Returns zero on success, or a negative errno.
2890  */
2891 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2892                          struct nfs_fsinfo *info,
2893                          bool auth_probe)
2894 {
2895         int status;
2896
2897         switch (auth_probe) {
2898         case false:
2899                 status = nfs4_lookup_root(server, fhandle, info);
2900                 if (status != -NFS4ERR_WRONGSEC)
2901                         break;
2902                 /* Did user force a 'sec=' mount option? */
2903                 if (server->flags & NFS_MOUNT_SECFLAVOUR)
2904                         break;
2905         default:
2906                 status = nfs4_do_find_root_sec(server, fhandle, info);
2907         }
2908
2909         if (status == 0)
2910                 status = nfs4_server_capabilities(server, fhandle);
2911         if (status == 0)
2912                 status = nfs4_do_fsinfo(server, fhandle, info);
2913
2914         return nfs4_map_errors(status);
2915 }
2916
2917 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2918                               struct nfs_fsinfo *info)
2919 {
2920         int error;
2921         struct nfs_fattr *fattr = info->fattr;
2922         struct nfs4_label *label = NULL;
2923
2924         error = nfs4_server_capabilities(server, mntfh);
2925         if (error < 0) {
2926                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2927                 return error;
2928         }
2929
2930         label = nfs4_label_alloc(server, GFP_KERNEL);
2931         if (IS_ERR(label))
2932                 return PTR_ERR(label);
2933
2934         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2935         if (error < 0) {
2936                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2937                 goto err_free_label;
2938         }
2939
2940         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2941             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2942                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2943
2944 err_free_label:
2945         nfs4_label_free(label);
2946
2947         return error;
2948 }
2949
2950 /*
2951  * Get locations and (maybe) other attributes of a referral.
2952  * Note that we'll actually follow the referral later when
2953  * we detect fsid mismatch in inode revalidation
2954  */
2955 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2956                              const struct qstr *name, struct nfs_fattr *fattr,
2957                              struct nfs_fh *fhandle)
2958 {
2959         int status = -ENOMEM;
2960         struct page *page = NULL;
2961         struct nfs4_fs_locations *locations = NULL;
2962
2963         page = alloc_page(GFP_KERNEL);
2964         if (page == NULL)
2965                 goto out;
2966         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2967         if (locations == NULL)
2968                 goto out;
2969
2970         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2971         if (status != 0)
2972                 goto out;
2973         /* Make sure server returned a different fsid for the referral */
2974         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2975                 dprintk("%s: server did not return a different fsid for"
2976                         " a referral at %s\n", __func__, name->name);
2977                 status = -EIO;
2978                 goto out;
2979         }
2980         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2981         nfs_fixup_referral_attributes(&locations->fattr);
2982
2983         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2984         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2985         memset(fhandle, 0, sizeof(struct nfs_fh));
2986 out:
2987         if (page)
2988                 __free_page(page);
2989         kfree(locations);
2990         return status;
2991 }
2992
2993 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2994                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2995 {
2996         struct nfs4_getattr_arg args = {
2997                 .fh = fhandle,
2998                 .bitmask = server->attr_bitmask,
2999         };
3000         struct nfs4_getattr_res res = {
3001                 .fattr = fattr,
3002                 .label = label,
3003                 .server = server,
3004         };
3005         struct rpc_message msg = {
3006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3007                 .rpc_argp = &args,
3008                 .rpc_resp = &res,
3009         };
3010
3011         args.bitmask = nfs4_bitmask(server, label);
3012
3013         nfs_fattr_init(fattr);
3014         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3015 }
3016
3017 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3018                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3019 {
3020         struct nfs4_exception exception = { };
3021         int err;
3022         do {
3023                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3024                 trace_nfs4_getattr(server, fhandle, fattr, err);
3025                 err = nfs4_handle_exception(server, err,
3026                                 &exception);
3027         } while (exception.retry);
3028         return err;
3029 }
3030
3031 /*
3032  * The file is not closed if it is opened due to the a request to change
3033  * the size of the file. The open call will not be needed once the
3034  * VFS layer lookup-intents are implemented.
3035  *
3036  * Close is called when the inode is destroyed.
3037  * If we haven't opened the file for O_WRONLY, we
3038  * need to in the size_change case to obtain a stateid.
3039  *
3040  * Got race?
3041  * Because OPEN is always done by name in nfsv4, it is
3042  * possible that we opened a different file by the same
3043  * name.  We can recognize this race condition, but we
3044  * can't do anything about it besides returning an error.
3045  *
3046  * This will be fixed with VFS changes (lookup-intent).
3047  */
3048 static int
3049 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3050                   struct iattr *sattr)
3051 {
3052         struct inode *inode = dentry->d_inode;
3053         struct rpc_cred *cred = NULL;
3054         struct nfs4_state *state = NULL;
3055         struct nfs4_label *label = NULL;
3056         int status;
3057
3058         if (pnfs_ld_layoutret_on_setattr(inode))
3059                 pnfs_commit_and_return_layout(inode);
3060
3061         nfs_fattr_init(fattr);
3062
3063         /* Deal with open(O_TRUNC) */
3064         if (sattr->ia_valid & ATTR_OPEN)
3065                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3066
3067         /* Optimization: if the end result is no change, don't RPC */
3068         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3069                 return 0;
3070
3071         /* Search for an existing open(O_WRITE) file */
3072         if (sattr->ia_valid & ATTR_FILE) {
3073                 struct nfs_open_context *ctx;
3074
3075                 ctx = nfs_file_open_context(sattr->ia_file);
3076                 if (ctx) {
3077                         cred = ctx->cred;
3078                         state = ctx->state;
3079                 }
3080         }
3081
3082         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3083         if (IS_ERR(label))
3084                 return PTR_ERR(label);
3085
3086         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3087         if (status == 0) {
3088                 nfs_setattr_update_inode(inode, sattr);
3089                 nfs_setsecurity(inode, fattr, label);
3090         }
3091         nfs4_label_free(label);
3092         return status;
3093 }
3094
3095 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3096                 const struct qstr *name, struct nfs_fh *fhandle,
3097                 struct nfs_fattr *fattr, struct nfs4_label *label)
3098 {
3099         struct nfs_server *server = NFS_SERVER(dir);
3100         int                    status;
3101         struct nfs4_lookup_arg args = {
3102                 .bitmask = server->attr_bitmask,
3103                 .dir_fh = NFS_FH(dir),
3104                 .name = name,
3105         };
3106         struct nfs4_lookup_res res = {
3107                 .server = server,
3108                 .fattr = fattr,
3109                 .label = label,
3110                 .fh = fhandle,
3111         };
3112         struct rpc_message msg = {
3113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3114                 .rpc_argp = &args,
3115                 .rpc_resp = &res,
3116         };
3117
3118         args.bitmask = nfs4_bitmask(server, label);
3119
3120         nfs_fattr_init(fattr);
3121
3122         dprintk("NFS call  lookup %s\n", name->name);
3123         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3124         dprintk("NFS reply lookup: %d\n", status);
3125         return status;
3126 }
3127
3128 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3129 {
3130         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3131                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3132         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3133         fattr->nlink = 2;
3134 }
3135
3136 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3137                                    struct qstr *name, struct nfs_fh *fhandle,
3138                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3139 {
3140         struct nfs4_exception exception = { };
3141         struct rpc_clnt *client = *clnt;
3142         int err;
3143         do {
3144                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3145                 trace_nfs4_lookup(dir, name, err);
3146                 switch (err) {
3147                 case -NFS4ERR_BADNAME:
3148                         err = -ENOENT;
3149                         goto out;
3150                 case -NFS4ERR_MOVED:
3151                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3152                         goto out;
3153                 case -NFS4ERR_WRONGSEC:
3154                         err = -EPERM;
3155                         if (client != *clnt)
3156                                 goto out;
3157                         /* No security negotiation if the user specified 'sec=' */
3158                         if (NFS_SERVER(dir)->flags & NFS_MOUNT_SECFLAVOUR)
3159                                 goto out;
3160                         client = nfs4_create_sec_client(client, dir, name);
3161                         if (IS_ERR(client))
3162                                 return PTR_ERR(client);
3163
3164                         exception.retry = 1;
3165                         break;
3166                 default:
3167                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3168                 }
3169         } while (exception.retry);
3170
3171 out:
3172         if (err == 0)
3173                 *clnt = client;
3174         else if (client != *clnt)
3175                 rpc_shutdown_client(client);
3176
3177         return err;
3178 }
3179
3180 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3181                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3182                             struct nfs4_label *label)
3183 {
3184         int status;
3185         struct rpc_clnt *client = NFS_CLIENT(dir);
3186
3187         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3188         if (client != NFS_CLIENT(dir)) {
3189                 rpc_shutdown_client(client);
3190                 nfs_fixup_secinfo_attributes(fattr);
3191         }
3192         return status;
3193 }
3194
3195 struct rpc_clnt *
3196 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3197                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3198 {
3199         struct rpc_clnt *client = NFS_CLIENT(dir);
3200         int status;
3201
3202         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3203         if (status < 0)
3204                 return ERR_PTR(status);
3205         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3206 }
3207
3208 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3209 {
3210         struct nfs_server *server = NFS_SERVER(inode);
3211         struct nfs4_accessargs args = {
3212                 .fh = NFS_FH(inode),
3213                 .bitmask = server->cache_consistency_bitmask,
3214         };
3215         struct nfs4_accessres res = {
3216                 .server = server,
3217         };
3218         struct rpc_message msg = {
3219                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3220                 .rpc_argp = &args,
3221                 .rpc_resp = &res,
3222                 .rpc_cred = entry->cred,
3223         };
3224         int mode = entry->mask;
3225         int status = 0;
3226
3227         /*
3228          * Determine which access bits we want to ask for...
3229          */
3230         if (mode & MAY_READ)
3231                 args.access |= NFS4_ACCESS_READ;
3232         if (S_ISDIR(inode->i_mode)) {
3233                 if (mode & MAY_WRITE)
3234                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3235                 if (mode & MAY_EXEC)
3236                         args.access |= NFS4_ACCESS_LOOKUP;
3237         } else {
3238                 if (mode & MAY_WRITE)
3239                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3240                 if (mode & MAY_EXEC)
3241                         args.access |= NFS4_ACCESS_EXECUTE;
3242         }
3243
3244         res.fattr = nfs_alloc_fattr();
3245         if (res.fattr == NULL)
3246                 return -ENOMEM;
3247
3248         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3249         if (!status) {
3250                 nfs_access_set_mask(entry, res.access);
3251                 nfs_refresh_inode(inode, res.fattr);
3252         }
3253         nfs_free_fattr(res.fattr);
3254         return status;
3255 }
3256
3257 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3258 {
3259         struct nfs4_exception exception = { };
3260         int err;
3261         do {
3262                 err = _nfs4_proc_access(inode, entry);
3263                 trace_nfs4_access(inode, err);
3264                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3265                                 &exception);
3266         } while (exception.retry);
3267         return err;
3268 }
3269
3270 /*
3271  * TODO: For the time being, we don't try to get any attributes
3272  * along with any of the zero-copy operations READ, READDIR,
3273  * READLINK, WRITE.
3274  *
3275  * In the case of the first three, we want to put the GETATTR
3276  * after the read-type operation -- this is because it is hard
3277  * to predict the length of a GETATTR response in v4, and thus
3278  * align the READ data correctly.  This means that the GETATTR
3279  * may end up partially falling into the page cache, and we should
3280  * shift it into the 'tail' of the xdr_buf before processing.
3281  * To do this efficiently, we need to know the total length
3282  * of data received, which doesn't seem to be available outside
3283  * of the RPC layer.
3284  *
3285  * In the case of WRITE, we also want to put the GETATTR after
3286  * the operation -- in this case because we want to make sure
3287  * we get the post-operation mtime and size.
3288  *
3289  * Both of these changes to the XDR layer would in fact be quite
3290  * minor, but I decided to leave them for a subsequent patch.
3291  */
3292 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3293                 unsigned int pgbase, unsigned int pglen)
3294 {
3295         struct nfs4_readlink args = {
3296                 .fh       = NFS_FH(inode),
3297                 .pgbase   = pgbase,
3298                 .pglen    = pglen,
3299                 .pages    = &page,
3300         };
3301         struct nfs4_readlink_res res;
3302         struct rpc_message msg = {
3303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3304                 .rpc_argp = &args,
3305                 .rpc_resp = &res,
3306         };
3307
3308         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3309 }
3310
3311 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3312                 unsigned int pgbase, unsigned int pglen)
3313 {
3314         struct nfs4_exception exception = { };
3315         int err;
3316         do {
3317                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3318                 trace_nfs4_readlink(inode, err);
3319                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3320                                 &exception);
3321         } while (exception.retry);
3322         return err;
3323 }
3324
3325 /*
3326  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3327  */
3328 static int
3329 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3330                  int flags)
3331 {
3332         struct nfs4_label l, *ilabel = NULL;
3333         struct nfs_open_context *ctx;
3334         struct nfs4_state *state;
3335         int status = 0;
3336
3337         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3338         if (IS_ERR(ctx))
3339                 return PTR_ERR(ctx);
3340
3341         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3342
3343         sattr->ia_mode &= ~current_umask();
3344         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3345         if (IS_ERR(state)) {
3346                 status = PTR_ERR(state);
3347                 goto out;
3348         }
3349 out:
3350         nfs4_label_release_security(ilabel);
3351         put_nfs_open_context(ctx);
3352         return status;
3353 }
3354
3355 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3356 {
3357         struct nfs_server *server = NFS_SERVER(dir);
3358         struct nfs_removeargs args = {
3359                 .fh = NFS_FH(dir),
3360                 .name = *name,
3361         };
3362         struct nfs_removeres res = {
3363                 .server = server,
3364         };
3365         struct rpc_message msg = {
3366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3367                 .rpc_argp = &args,
3368                 .rpc_resp = &res,
3369         };
3370         int status;
3371
3372         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3373         if (status == 0)
3374                 update_changeattr(dir, &res.cinfo);
3375         return status;
3376 }
3377
3378 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3379 {
3380         struct nfs4_exception exception = { };
3381         int err;
3382         do {
3383                 err = _nfs4_proc_remove(dir, name);
3384                 trace_nfs4_remove(dir, name, err);
3385                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3386                                 &exception);
3387         } while (exception.retry);
3388         return err;
3389 }
3390
3391 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3392 {
3393         struct nfs_server *server = NFS_SERVER(dir);
3394         struct nfs_removeargs *args = msg->rpc_argp;
3395         struct nfs_removeres *res = msg->rpc_resp;
3396
3397         res->server = server;
3398         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3399         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3400
3401         nfs_fattr_init(res->dir_attr);
3402 }
3403
3404 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3405 {
3406         nfs4_setup_sequence(NFS_SERVER(data->dir),
3407                         &data->args.seq_args,
3408                         &data->res.seq_res,
3409                         task);
3410 }
3411
3412 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3413 {
3414         struct nfs_unlinkdata *data = task->tk_calldata;
3415         struct nfs_removeres *res = &data->res;
3416
3417         if (!nfs4_sequence_done(task, &res->seq_res))
3418                 return 0;
3419         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3420                 return 0;
3421         update_changeattr(dir, &res->cinfo);
3422         return 1;
3423 }
3424
3425 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3426 {
3427         struct nfs_server *server = NFS_SERVER(dir);
3428         struct nfs_renameargs *arg = msg->rpc_argp;
3429         struct nfs_renameres *res = msg->rpc_resp;
3430
3431         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3432         res->server = server;
3433         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3434 }
3435
3436 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3437 {
3438         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3439                         &data->args.seq_args,
3440                         &data->res.seq_res,
3441                         task);
3442 }
3443
3444 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3445                                  struct inode *new_dir)
3446 {
3447         struct nfs_renamedata *data = task->tk_calldata;
3448         struct nfs_renameres *res = &data->res;
3449
3450         if (!nfs4_sequence_done(task, &res->seq_res))
3451                 return 0;
3452         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3453                 return 0;
3454
3455         update_changeattr(old_dir, &res->old_cinfo);
3456         update_changeattr(new_dir, &res->new_cinfo);
3457         return 1;
3458 }
3459
3460 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3461                 struct inode *new_dir, struct qstr *new_name)
3462 {
3463         struct nfs_server *server = NFS_SERVER(old_dir);
3464         struct nfs_renameargs arg = {
3465                 .old_dir = NFS_FH(old_dir),
3466                 .new_dir = NFS_FH(new_dir),
3467                 .old_name = old_name,
3468                 .new_name = new_name,
3469         };
3470         struct nfs_renameres res = {
3471                 .server = server,
3472         };
3473         struct rpc_message msg = {
3474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3475                 .rpc_argp = &arg,
3476                 .rpc_resp = &res,
3477         };
3478         int status = -ENOMEM;
3479
3480         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3481         if (!status) {
3482                 update_changeattr(old_dir, &res.old_cinfo);
3483                 update_changeattr(new_dir, &res.new_cinfo);
3484         }
3485         return status;
3486 }
3487
3488 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3489                 struct inode *new_dir, struct qstr *new_name)
3490 {
3491         struct nfs4_exception exception = { };
3492         int err;
3493         do {
3494                 err = _nfs4_proc_rename(old_dir, old_name,
3495                                         new_dir, new_name);
3496                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3497                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3498                                 &exception);
3499         } while (exception.retry);
3500         return err;
3501 }
3502
3503 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3504 {
3505         struct nfs_server *server = NFS_SERVER(inode);
3506         struct nfs4_link_arg arg = {
3507                 .fh     = NFS_FH(inode),
3508                 .dir_fh = NFS_FH(dir),
3509                 .name   = name,
3510                 .bitmask = server->attr_bitmask,
3511         };
3512         struct nfs4_link_res res = {
3513                 .server = server,
3514                 .label = NULL,
3515         };
3516         struct rpc_message msg = {
3517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3518                 .rpc_argp = &arg,
3519                 .rpc_resp = &res,
3520         };
3521         int status = -ENOMEM;
3522
3523         res.fattr = nfs_alloc_fattr();
3524         if (res.fattr == NULL)
3525                 goto out;
3526
3527         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3528         if (IS_ERR(res.label)) {
3529                 status = PTR_ERR(res.label);
3530                 goto out;
3531         }
3532         arg.bitmask = nfs4_bitmask(server, res.label);
3533
3534         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3535         if (!status) {
3536                 update_changeattr(dir, &res.cinfo);
3537                 status = nfs_post_op_update_inode(inode, res.fattr);
3538                 if (!status)
3539                         nfs_setsecurity(inode, res.fattr, res.label);
3540         }
3541
3542
3543         nfs4_label_free(res.label);
3544
3545 out:
3546         nfs_free_fattr(res.fattr);
3547         return status;
3548 }
3549
3550 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3551 {
3552         struct nfs4_exception exception = { };
3553         int err;
3554         do {
3555                 err = nfs4_handle_exception(NFS_SERVER(inode),
3556                                 _nfs4_proc_link(inode, dir, name),
3557                                 &exception);
3558         } while (exception.retry);
3559         return err;
3560 }
3561
3562 struct nfs4_createdata {
3563         struct rpc_message msg;
3564         struct nfs4_create_arg arg;
3565         struct nfs4_create_res res;
3566         struct nfs_fh fh;
3567         struct nfs_fattr fattr;
3568         struct nfs4_label *label;
3569 };
3570
3571 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3572                 struct qstr *name, struct iattr *sattr, u32 ftype)
3573 {
3574         struct nfs4_createdata *data;
3575
3576         data = kzalloc(sizeof(*data), GFP_KERNEL);
3577         if (data != NULL) {
3578                 struct nfs_server *server = NFS_SERVER(dir);
3579
3580                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3581                 if (IS_ERR(data->label))
3582                         goto out_free;
3583
3584                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3585                 data->msg.rpc_argp = &data->arg;
3586                 data->msg.rpc_resp = &data->res;
3587                 data->arg.dir_fh = NFS_FH(dir);
3588                 data->arg.server = server;
3589                 data->arg.name = name;
3590                 data->arg.attrs = sattr;
3591                 data->arg.ftype = ftype;
3592                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3593                 data->res.server = server;
3594                 data->res.fh = &data->fh;
3595                 data->res.fattr = &data->fattr;
3596                 data->res.label = data->label;
3597                 nfs_fattr_init(data->res.fattr);
3598         }
3599         return data;
3600 out_free:
3601         kfree(data);
3602         return NULL;
3603 }
3604
3605 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3606 {
3607         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3608                                     &data->arg.seq_args, &data->res.seq_res, 1);
3609         if (status == 0) {
3610                 update_changeattr(dir, &data->res.dir_cinfo);
3611                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3612         }
3613         return status;
3614 }
3615
3616 static void nfs4_free_createdata(struct nfs4_createdata *data)
3617 {
3618         nfs4_label_free(data->label);
3619         kfree(data);
3620 }
3621
3622 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3623                 struct page *page, unsigned int len, struct iattr *sattr,
3624                 struct nfs4_label *label)
3625 {
3626         struct nfs4_createdata *data;
3627         int status = -ENAMETOOLONG;
3628
3629         if (len > NFS4_MAXPATHLEN)
3630                 goto out;
3631
3632         status = -ENOMEM;
3633         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3634         if (data == NULL)
3635                 goto out;
3636
3637         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3638         data->arg.u.symlink.pages = &page;
3639         data->arg.u.symlink.len = len;
3640         data->arg.label = label;
3641
3642         status = nfs4_do_create(dir, dentry, data);
3643
3644         nfs4_free_createdata(data);
3645 out:
3646         return status;
3647 }
3648
3649 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3650                 struct page *page, unsigned int len, struct iattr *sattr)
3651 {
3652         struct nfs4_exception exception = { };
3653         struct nfs4_label l, *label = NULL;
3654         int err;
3655
3656         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3657
3658         do {
3659                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3660                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3661                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3662                                 &exception);
3663         } while (exception.retry);
3664
3665         nfs4_label_release_security(label);
3666         return err;
3667 }
3668
3669 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3670                 struct iattr *sattr, struct nfs4_label *label)
3671 {
3672         struct nfs4_createdata *data;
3673         int status = -ENOMEM;
3674
3675         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3676         if (data == NULL)
3677                 goto out;
3678
3679         data->arg.label = label;
3680         status = nfs4_do_create(dir, dentry, data);
3681
3682         nfs4_free_createdata(data);
3683 out:
3684         return status;
3685 }
3686
3687 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3688                 struct iattr *sattr)
3689 {
3690         struct nfs4_exception exception = { };
3691         struct nfs4_label l, *label = NULL;
3692         int err;
3693
3694         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3695
3696         sattr->ia_mode &= ~current_umask();
3697         do {
3698                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3699                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3700                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3701                                 &exception);
3702         } while (exception.retry);
3703         nfs4_label_release_security(label);
3704
3705         return err;
3706 }
3707
3708 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3709                 u64 cookie, struct page **pages, unsigned int count, int plus)
3710 {
3711         struct inode            *dir = dentry->d_inode;
3712         struct nfs4_readdir_arg args = {
3713                 .fh = NFS_FH(dir),
3714                 .pages = pages,
3715                 .pgbase = 0,
3716                 .count = count,
3717                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3718                 .plus = plus,
3719         };
3720         struct nfs4_readdir_res res;
3721         struct rpc_message msg = {
3722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3723                 .rpc_argp = &args,
3724                 .rpc_resp = &res,
3725                 .rpc_cred = cred,
3726         };
3727         int                     status;
3728
3729         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3730                         dentry->d_parent->d_name.name,
3731                         dentry->d_name.name,
3732                         (unsigned long long)cookie);
3733         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3734         res.pgbase = args.pgbase;
3735         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3736         if (status >= 0) {
3737                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3738                 status += args.pgbase;
3739         }
3740
3741         nfs_invalidate_atime(dir);
3742
3743         dprintk("%s: returns %d\n", __func__, status);
3744         return status;
3745 }
3746
3747 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3748                 u64 cookie, struct page **pages, unsigned int count, int plus)
3749 {
3750         struct nfs4_exception exception = { };
3751         int err;
3752         do {
3753                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3754                                 pages, count, plus);
3755                 trace_nfs4_readdir(dentry->d_inode, err);
3756                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3757                                 &exception);
3758         } while (exception.retry);
3759         return err;
3760 }
3761
3762 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3763                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3764 {
3765         struct nfs4_createdata *data;
3766         int mode = sattr->ia_mode;
3767         int status = -ENOMEM;
3768
3769         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3770         if (data == NULL)
3771                 goto out;
3772
3773         if (S_ISFIFO(mode))
3774                 data->arg.ftype = NF4FIFO;
3775         else if (S_ISBLK(mode)) {
3776                 data->arg.ftype = NF4BLK;
3777                 data->arg.u.device.specdata1 = MAJOR(rdev);
3778                 data->arg.u.device.specdata2 = MINOR(rdev);
3779         }
3780         else if (S_ISCHR(mode)) {
3781                 data->arg.ftype = NF4CHR;
3782                 data->arg.u.device.specdata1 = MAJOR(rdev);
3783                 data->arg.u.device.specdata2 = MINOR(rdev);
3784         } else if (!S_ISSOCK(mode)) {
3785                 status = -EINVAL;
3786                 goto out_free;
3787         }
3788
3789         data->arg.label = label;
3790         status = nfs4_do_create(dir, dentry, data);
3791 out_free:
3792         nfs4_free_createdata(data);
3793 out:
3794         return status;
3795 }
3796
3797 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3798                 struct iattr *sattr, dev_t rdev)
3799 {
3800         struct nfs4_exception exception = { };
3801         struct nfs4_label l, *label = NULL;
3802         int err;
3803
3804         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3805
3806         sattr->ia_mode &= ~current_umask();
3807         do {
3808                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3809                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3810                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3811                                 &exception);
3812         } while (exception.retry);
3813
3814         nfs4_label_release_security(label);
3815
3816         return err;
3817 }
3818
3819 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3820                  struct nfs_fsstat *fsstat)
3821 {
3822         struct nfs4_statfs_arg args = {
3823                 .fh = fhandle,
3824                 .bitmask = server->attr_bitmask,
3825         };
3826         struct nfs4_statfs_res res = {
3827                 .fsstat = fsstat,
3828         };
3829         struct rpc_message msg = {
3830                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3831                 .rpc_argp = &args,
3832                 .rpc_resp = &res,
3833         };
3834
3835         nfs_fattr_init(fsstat->fattr);
3836         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3837 }
3838
3839 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3840 {
3841         struct nfs4_exception exception = { };
3842         int err;
3843         do {
3844                 err = nfs4_handle_exception(server,
3845                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3846                                 &exception);
3847         } while (exception.retry);
3848         return err;
3849 }
3850
3851 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3852                 struct nfs_fsinfo *fsinfo)
3853 {
3854         struct nfs4_fsinfo_arg args = {
3855                 .fh = fhandle,
3856                 .bitmask = server->attr_bitmask,
3857         };
3858         struct nfs4_fsinfo_res res = {
3859                 .fsinfo = fsinfo,
3860         };
3861         struct rpc_message msg = {
3862                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3863                 .rpc_argp = &args,
3864                 .rpc_resp = &res,
3865         };
3866
3867         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3868 }
3869
3870 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3871 {
3872         struct nfs4_exception exception = { };
3873         unsigned long now = jiffies;
3874         int err;
3875
3876         do {
3877                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3878                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3879                 if (err == 0) {
3880                         struct nfs_client *clp = server->nfs_client;
3881
3882                         spin_lock(&clp->cl_lock);
3883                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3884                         clp->cl_last_renewal = now;
3885                         spin_unlock(&clp->cl_lock);
3886                         break;
3887                 }
3888                 err = nfs4_handle_exception(server, err, &exception);
3889         } while (exception.retry);
3890         return err;
3891 }
3892
3893 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3894 {
3895         int error;
3896
3897         nfs_fattr_init(fsinfo->fattr);
3898         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3899         if (error == 0) {
3900                 /* block layout checks this! */
3901                 server->pnfs_blksize = fsinfo->blksize;
3902                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3903         }
3904
3905         return error;
3906 }
3907
3908 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3909                 struct nfs_pathconf *pathconf)
3910 {
3911         struct nfs4_pathconf_arg args = {
3912                 .fh = fhandle,
3913                 .bitmask = server->attr_bitmask,
3914         };
3915         struct nfs4_pathconf_res res = {
3916                 .pathconf = pathconf,
3917         };
3918         struct rpc_message msg = {
3919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3920                 .rpc_argp = &args,
3921                 .rpc_resp = &res,
3922         };
3923
3924         /* None of the pathconf attributes are mandatory to implement */
3925         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3926                 memset(pathconf, 0, sizeof(*pathconf));
3927                 return 0;
3928         }
3929
3930         nfs_fattr_init(pathconf->fattr);
3931         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3932 }
3933
3934 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3935                 struct nfs_pathconf *pathconf)
3936 {
3937         struct nfs4_exception exception = { };
3938         int err;
3939
3940         do {
3941                 err = nfs4_handle_exception(server,
3942                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3943                                 &exception);
3944         } while (exception.retry);
3945         return err;
3946 }
3947
3948 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3949                 const struct nfs_open_context *ctx,
3950                 const struct nfs_lock_context *l_ctx,
3951                 fmode_t fmode)
3952 {
3953         const struct nfs_lockowner *lockowner = NULL;
3954
3955         if (l_ctx != NULL)
3956                 lockowner = &l_ctx->lockowner;
3957         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3958 }
3959 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3960
3961 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3962                 const struct nfs_open_context *ctx,
3963                 const struct nfs_lock_context *l_ctx,
3964                 fmode_t fmode)
3965 {
3966         nfs4_stateid current_stateid;
3967
3968         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3969                 return false;
3970         return nfs4_stateid_match(stateid, &current_stateid);
3971 }
3972
3973 static bool nfs4_error_stateid_expired(int err)
3974 {
3975         switch (err) {
3976         case -NFS4ERR_DELEG_REVOKED:
3977         case -NFS4ERR_ADMIN_REVOKED:
3978         case -NFS4ERR_BAD_STATEID:
3979         case -NFS4ERR_STALE_STATEID:
3980         case -NFS4ERR_OLD_STATEID:
3981         case -NFS4ERR_OPENMODE:
3982         case -NFS4ERR_EXPIRED:
3983                 return true;
3984         }
3985         return false;
3986 }
3987
3988 void __nfs4_read_done_cb(struct nfs_read_data *data)
3989 {
3990         nfs_invalidate_atime(data->header->inode);
3991 }
3992
3993 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3994 {
3995         struct nfs_server *server = NFS_SERVER(data->header->inode);
3996
3997         trace_nfs4_read(data, task->tk_status);
3998         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3999                 rpc_restart_call_prepare(task);
4000                 return -EAGAIN;
4001         }
4002
4003         __nfs4_read_done_cb(data);
4004         if (task->tk_status > 0)
4005                 renew_lease(server, data->timestamp);
4006         return 0;
4007 }
4008
4009 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4010                 struct nfs_readargs *args)
4011 {
4012
4013         if (!nfs4_error_stateid_expired(task->tk_status) ||
4014                 nfs4_stateid_is_current(&args->stateid,
4015                                 args->context,
4016                                 args->lock_context,
4017                                 FMODE_READ))
4018                 return false;
4019         rpc_restart_call_prepare(task);
4020         return true;
4021 }
4022
4023 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4024 {
4025
4026         dprintk("--> %s\n", __func__);
4027
4028         if (!nfs4_sequence_done(task, &data->res.seq_res))
4029                 return -EAGAIN;
4030         if (nfs4_read_stateid_changed(task, &data->args))
4031                 return -EAGAIN;
4032         return data->read_done_cb ? data->read_done_cb(task, data) :
4033                                     nfs4_read_done_cb(task, data);
4034 }
4035
4036 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4037 {
4038         data->timestamp   = jiffies;
4039         data->read_done_cb = nfs4_read_done_cb;
4040         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4041         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4042 }
4043
4044 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4045 {
4046         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4047                         &data->args.seq_args,
4048                         &data->res.seq_res,
4049                         task))
4050                 return 0;
4051         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4052                                 data->args.lock_context, FMODE_READ) == -EIO)
4053                 return -EIO;
4054         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4055                 return -EIO;
4056         return 0;
4057 }
4058
4059 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4060 {
4061         struct inode *inode = data->header->inode;
4062
4063         trace_nfs4_write(data, task->tk_status);
4064         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4065                 rpc_restart_call_prepare(task);
4066                 return -EAGAIN;
4067         }
4068         if (task->tk_status >= 0) {
4069                 renew_lease(NFS_SERVER(inode), data->timestamp);
4070                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4071         }
4072         return 0;
4073 }
4074
4075 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4076                 struct nfs_writeargs *args)
4077 {
4078
4079         if (!nfs4_error_stateid_expired(task->tk_status) ||
4080                 nfs4_stateid_is_current(&args->stateid,
4081                                 args->context,
4082                                 args->lock_context,
4083                                 FMODE_WRITE))
4084                 return false;
4085         rpc_restart_call_prepare(task);
4086         return true;
4087 }
4088
4089 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4090 {
4091         if (!nfs4_sequence_done(task, &data->res.seq_res))
4092                 return -EAGAIN;
4093         if (nfs4_write_stateid_changed(task, &data->args))
4094                 return -EAGAIN;
4095         return data->write_done_cb ? data->write_done_cb(task, data) :
4096                 nfs4_write_done_cb(task, data);
4097 }
4098
4099 static
4100 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4101 {
4102         const struct nfs_pgio_header *hdr = data->header;
4103
4104         /* Don't request attributes for pNFS or O_DIRECT writes */
4105         if (data->ds_clp != NULL || hdr->dreq != NULL)
4106                 return false;
4107         /* Otherwise, request attributes if and only if we don't hold
4108          * a delegation
4109          */
4110         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4111 }
4112
4113 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4114 {
4115         struct nfs_server *server = NFS_SERVER(data->header->inode);
4116
4117         if (!nfs4_write_need_cache_consistency_data(data)) {
4118                 data->args.bitmask = NULL;
4119                 data->res.fattr = NULL;
4120         } else
4121                 data->args.bitmask = server->cache_consistency_bitmask;
4122
4123         if (!data->write_done_cb)
4124                 data->write_done_cb = nfs4_write_done_cb;
4125         data->res.server = server;
4126         data->timestamp   = jiffies;
4127
4128         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4129         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4130 }
4131
4132 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4133 {
4134         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4135                         &data->args.seq_args,
4136                         &data->res.seq_res,
4137                         task))
4138                 return 0;
4139         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4140                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4141                 return -EIO;
4142         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4143                 return -EIO;
4144         return 0;
4145 }
4146
4147 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4148 {
4149         nfs4_setup_sequence(NFS_SERVER(data->inode),
4150                         &data->args.seq_args,
4151                         &data->res.seq_res,
4152                         task);
4153 }
4154
4155 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4156 {
4157         struct inode *inode = data->inode;
4158
4159         trace_nfs4_commit(data, task->tk_status);
4160         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4161                 rpc_restart_call_prepare(task);
4162                 return -EAGAIN;
4163         }
4164         return 0;
4165 }
4166
4167 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4168 {
4169         if (!nfs4_sequence_done(task, &data->res.seq_res))
4170                 return -EAGAIN;
4171         return data->commit_done_cb(task, data);
4172 }
4173
4174 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4175 {
4176         struct nfs_server *server = NFS_SERVER(data->inode);
4177
4178         if (data->commit_done_cb == NULL)
4179                 data->commit_done_cb = nfs4_commit_done_cb;
4180         data->res.server = server;
4181         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4182         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4183 }
4184
4185 struct nfs4_renewdata {
4186         struct nfs_client       *client;
4187         unsigned long           timestamp;
4188 };
4189
4190 /*
4191  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4192  * standalone procedure for queueing an asynchronous RENEW.
4193  */
4194 static void nfs4_renew_release(void *calldata)
4195 {
4196         struct nfs4_renewdata *data = calldata;
4197         struct nfs_client *clp = data->client;
4198
4199         if (atomic_read(&clp->cl_count) > 1)
4200                 nfs4_schedule_state_renewal(clp);
4201         nfs_put_client(clp);
4202         kfree(data);
4203 }
4204
4205 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4206 {
4207         struct nfs4_renewdata *data = calldata;
4208         struct nfs_client *clp = data->client;
4209         unsigned long timestamp = data->timestamp;
4210
4211         trace_nfs4_renew_async(clp, task->tk_status);
4212         if (task->tk_status < 0) {
4213                 /* Unless we're shutting down, schedule state recovery! */
4214                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4215                         return;
4216                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4217                         nfs4_schedule_lease_recovery(clp);
4218                         return;
4219                 }
4220                 nfs4_schedule_path_down_recovery(clp);
4221         }
4222         do_renew_lease(clp, timestamp);
4223 }
4224
4225 static const struct rpc_call_ops nfs4_renew_ops = {
4226         .rpc_call_done = nfs4_renew_done,
4227         .rpc_release = nfs4_renew_release,
4228 };
4229
4230 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4231 {
4232         struct rpc_message msg = {
4233                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4234                 .rpc_argp       = clp,
4235                 .rpc_cred       = cred,
4236         };
4237         struct nfs4_renewdata *data;
4238
4239         if (renew_flags == 0)
4240                 return 0;
4241         if (!atomic_inc_not_zero(&clp->cl_count))
4242                 return -EIO;
4243         data = kmalloc(sizeof(*data), GFP_NOFS);
4244         if (data == NULL)
4245                 return -ENOMEM;
4246         data->client = clp;
4247         data->timestamp = jiffies;
4248         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4249                         &nfs4_renew_ops, data);
4250 }
4251
4252 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4253 {
4254         struct rpc_message msg = {
4255                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4256                 .rpc_argp       = clp,
4257                 .rpc_cred       = cred,
4258         };
4259         unsigned long now = jiffies;
4260         int status;
4261
4262         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4263         if (status < 0)
4264                 return status;
4265         do_renew_lease(clp, now);
4266         return 0;
4267 }
4268
4269 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4270 {
4271         return (server->caps & NFS_CAP_ACLS)
4272                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4273                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4274 }
4275
4276 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4277  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4278  * the stack.
4279  */
4280 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4281
4282 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4283                 struct page **pages, unsigned int *pgbase)
4284 {
4285         struct page *newpage, **spages;
4286         int rc = 0;
4287         size_t len;
4288         spages = pages;
4289
4290         do {
4291                 len = min_t(size_t, PAGE_SIZE, buflen);
4292                 newpage = alloc_page(GFP_KERNEL);
4293
4294                 if (newpage == NULL)
4295                         goto unwind;
4296                 memcpy(page_address(newpage), buf, len);
4297                 buf += len;
4298                 buflen -= len;
4299                 *pages++ = newpage;
4300                 rc++;
4301         } while (buflen != 0);
4302
4303         return rc;
4304
4305 unwind:
4306         for(; rc > 0; rc--)
4307                 __free_page(spages[rc-1]);
4308         return -ENOMEM;
4309 }
4310
4311 struct nfs4_cached_acl {
4312         int cached;
4313         size_t len;
4314         char data[0];
4315 };
4316
4317 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4318 {
4319         struct nfs_inode *nfsi = NFS_I(inode);
4320
4321         spin_lock(&inode->i_lock);
4322         kfree(nfsi->nfs4_acl);
4323         nfsi->nfs4_acl = acl;
4324         spin_unlock(&inode->i_lock);
4325 }
4326
4327 static void nfs4_zap_acl_attr(struct inode *inode)
4328 {
4329         nfs4_set_cached_acl(inode, NULL);
4330 }
4331
4332 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4333 {
4334         struct nfs_inode *nfsi = NFS_I(inode);
4335         struct nfs4_cached_acl *acl;
4336         int ret = -ENOENT;
4337
4338         spin_lock(&inode->i_lock);
4339         acl = nfsi->nfs4_acl;
4340         if (acl == NULL)
4341                 goto out;
4342         if (buf == NULL) /* user is just asking for length */
4343                 goto out_len;
4344         if (acl->cached == 0)
4345                 goto out;
4346         ret = -ERANGE; /* see getxattr(2) man page */
4347         if (acl->len > buflen)
4348                 goto out;
4349         memcpy(buf, acl->data, acl->len);
4350 out_len:
4351         ret = acl->len;
4352 out:
4353         spin_unlock(&inode->i_lock);
4354         return ret;
4355 }
4356
4357 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4358 {
4359         struct nfs4_cached_acl *acl;
4360         size_t buflen = sizeof(*acl) + acl_len;
4361
4362         if (buflen <= PAGE_SIZE) {
4363                 acl = kmalloc(buflen, GFP_KERNEL);
4364                 if (acl == NULL)
4365                         goto out;
4366                 acl->cached = 1;
4367                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4368         } else {
4369                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4370                 if (acl == NULL)
4371                         goto out;
4372                 acl->cached = 0;
4373         }
4374         acl->len = acl_len;
4375 out:
4376         nfs4_set_cached_acl(inode, acl);
4377 }
4378
4379 /*
4380  * The getxattr API returns the required buffer length when called with a
4381  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4382  * the required buf.  On a NULL buf, we send a page of data to the server
4383  * guessing that the ACL request can be serviced by a page. If so, we cache
4384  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4385  * the cache. If not so, we throw away the page, and cache the required
4386  * length. The next getxattr call will then produce another round trip to
4387  * the server, this time with the input buf of the required size.
4388  */
4389 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4390 {
4391         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4392         struct nfs_getaclargs args = {
4393                 .fh = NFS_FH(inode),
4394                 .acl_pages = pages,
4395                 .acl_len = buflen,
4396         };
4397         struct nfs_getaclres res = {
4398                 .acl_len = buflen,
4399         };
4400         struct rpc_message msg = {
4401                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4402                 .rpc_argp = &args,
4403                 .rpc_resp = &res,
4404         };
4405         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4406         int ret = -ENOMEM, i;
4407
4408         /* As long as we're doing a round trip to the server anyway,
4409          * let's be prepared for a page of acl data. */
4410         if (npages == 0)
4411                 npages = 1;
4412         if (npages > ARRAY_SIZE(pages))
4413                 return -ERANGE;
4414
4415         for (i = 0; i < npages; i++) {
4416                 pages[i] = alloc_page(GFP_KERNEL);
4417                 if (!pages[i])
4418                         goto out_free;
4419         }
4420
4421         /* for decoding across pages */
4422         res.acl_scratch = alloc_page(GFP_KERNEL);
4423         if (!res.acl_scratch)
4424                 goto out_free;
4425
4426         args.acl_len = npages * PAGE_SIZE;
4427         args.acl_pgbase = 0;
4428
4429         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4430                 __func__, buf, buflen, npages, args.acl_len);
4431         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4432                              &msg, &args.seq_args, &res.seq_res, 0);
4433         if (ret)
4434                 goto out_free;
4435
4436         /* Handle the case where the passed-in buffer is too short */
4437         if (res.acl_flags & NFS4_ACL_TRUNC) {
4438                 /* Did the user only issue a request for the acl length? */
4439                 if (buf == NULL)
4440                         goto out_ok;
4441                 ret = -ERANGE;
4442                 goto out_free;
4443         }
4444         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4445         if (buf) {
4446                 if (res.acl_len > buflen) {
4447                         ret = -ERANGE;
4448                         goto out_free;
4449                 }
4450                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4451         }
4452 out_ok:
4453         ret = res.acl_len;
4454 out_free:
4455         for (i = 0; i < npages; i++)
4456                 if (pages[i])
4457                         __free_page(pages[i]);
4458         if (res.acl_scratch)
4459                 __free_page(res.acl_scratch);
4460         return ret;
4461 }
4462
4463 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4464 {
4465         struct nfs4_exception exception = { };
4466         ssize_t ret;
4467         do {
4468                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4469                 trace_nfs4_get_acl(inode, ret);
4470                 if (ret >= 0)
4471                         break;
4472                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4473         } while (exception.retry);
4474         return ret;
4475 }
4476
4477 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4478 {
4479         struct nfs_server *server = NFS_SERVER(inode);
4480         int ret;
4481
4482         if (!nfs4_server_supports_acls(server))
4483                 return -EOPNOTSUPP;
4484         ret = nfs_revalidate_inode(server, inode);
4485         if (ret < 0)
4486                 return ret;
4487         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4488                 nfs_zap_acl_cache(inode);
4489         ret = nfs4_read_cached_acl(inode, buf, buflen);
4490         if (ret != -ENOENT)
4491                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4492                  * but no cached acl data, just the acl length */
4493                 return ret;
4494         return nfs4_get_acl_uncached(inode, buf, buflen);
4495 }
4496
4497 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4498 {
4499         struct nfs_server *server = NFS_SERVER(inode);
4500         struct page *pages[NFS4ACL_MAXPAGES];
4501         struct nfs_setaclargs arg = {
4502                 .fh             = NFS_FH(inode),
4503                 .acl_pages      = pages,
4504                 .acl_len        = buflen,
4505         };
4506         struct nfs_setaclres res;
4507         struct rpc_message msg = {
4508                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4509                 .rpc_argp       = &arg,
4510                 .rpc_resp       = &res,
4511         };
4512         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4513         int ret, i;
4514
4515         if (!nfs4_server_supports_acls(server))
4516                 return -EOPNOTSUPP;
4517         if (npages > ARRAY_SIZE(pages))
4518                 return -ERANGE;
4519         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4520         if (i < 0)
4521                 return i;
4522         nfs4_inode_return_delegation(inode);
4523         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4524
4525         /*
4526          * Free each page after tx, so the only ref left is
4527          * held by the network stack
4528          */
4529         for (; i > 0; i--)
4530                 put_page(pages[i-1]);
4531
4532         /*
4533          * Acl update can result in inode attribute update.
4534          * so mark the attribute cache invalid.
4535          */
4536         spin_lock(&inode->i_lock);
4537         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4538         spin_unlock(&inode->i_lock);
4539         nfs_access_zap_cache(inode);
4540         nfs_zap_acl_cache(inode);
4541         return ret;
4542 }
4543
4544 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4545 {
4546         struct nfs4_exception exception = { };
4547         int err;
4548         do {
4549                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4550                 trace_nfs4_set_acl(inode, err);
4551                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4552                                 &exception);
4553         } while (exception.retry);
4554         return err;
4555 }
4556
4557 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4558 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4559                                         size_t buflen)
4560 {
4561         struct nfs_server *server = NFS_SERVER(inode);
4562         struct nfs_fattr fattr;
4563         struct nfs4_label label = {0, 0, buflen, buf};
4564
4565         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4566         struct nfs4_getattr_arg args = {
4567                 .fh             = NFS_FH(inode),
4568                 .bitmask        = bitmask,
4569         };
4570         struct nfs4_getattr_res res = {
4571                 .fattr          = &fattr,
4572                 .label          = &label,
4573                 .server         = server,
4574         };
4575         struct rpc_message msg = {
4576                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4577                 .rpc_argp       = &args,
4578                 .rpc_resp       = &res,
4579         };
4580         int ret;
4581
4582         nfs_fattr_init(&fattr);
4583
4584         ret = rpc_call_sync(server->client, &msg, 0);
4585         if (ret)
4586                 return ret;
4587         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4588                 return -ENOENT;
4589         if (buflen < label.len)
4590                 return -ERANGE;
4591         return 0;
4592 }
4593
4594 static int nfs4_get_security_label(struct inode *inode, void *buf,
4595                                         size_t buflen)
4596 {
4597         struct nfs4_exception exception = { };
4598         int err;
4599
4600         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4601                 return -EOPNOTSUPP;
4602
4603         do {
4604                 err = _nfs4_get_security_label(inode, buf, buflen);
4605                 trace_nfs4_get_security_label(inode, err);
4606                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4607                                 &exception);
4608         } while (exception.retry);
4609         return err;
4610 }
4611
4612 static int _nfs4_do_set_security_label(struct inode *inode,
4613                 struct nfs4_label *ilabel,
4614                 struct nfs_fattr *fattr,
4615                 struct nfs4_label *olabel)
4616 {
4617
4618         struct iattr sattr = {0};
4619         struct nfs_server *server = NFS_SERVER(inode);
4620         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4621         struct nfs_setattrargs args = {
4622                 .fh             = NFS_FH(inode),
4623                 .iap            = &sattr,
4624                 .server         = server,
4625                 .bitmask        = bitmask,
4626                 .label          = ilabel,
4627         };
4628         struct nfs_setattrres res = {
4629                 .fattr          = fattr,
4630                 .label          = olabel,
4631                 .server         = server,
4632         };
4633         struct rpc_message msg = {
4634                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4635                 .rpc_argp       = &args,
4636                 .rpc_resp       = &res,
4637         };
4638         int status;
4639
4640         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4641
4642         status = rpc_call_sync(server->client, &msg, 0);
4643         if (status)
4644                 dprintk("%s failed: %d\n", __func__, status);
4645
4646         return status;
4647 }
4648
4649 static int nfs4_do_set_security_label(struct inode *inode,
4650                 struct nfs4_label *ilabel,
4651                 struct nfs_fattr *fattr,
4652                 struct nfs4_label *olabel)
4653 {
4654         struct nfs4_exception exception = { };
4655         int err;
4656
4657         do {
4658                 err = _nfs4_do_set_security_label(inode, ilabel,
4659                                 fattr, olabel);
4660                 trace_nfs4_set_security_label(inode, err);
4661                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4662                                 &exception);
4663         } while (exception.retry);
4664         return err;
4665 }
4666
4667 static int
4668 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4669 {
4670         struct nfs4_label ilabel, *olabel = NULL;
4671         struct nfs_fattr fattr;
4672         struct rpc_cred *cred;
4673         struct inode *inode = dentry->d_inode;
4674         int status;
4675
4676         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4677                 return -EOPNOTSUPP;
4678
4679         nfs_fattr_init(&fattr);
4680
4681         ilabel.pi = 0;
4682         ilabel.lfs = 0;
4683         ilabel.label = (char *)buf;
4684         ilabel.len = buflen;
4685
4686         cred = rpc_lookup_cred();
4687         if (IS_ERR(cred))
4688                 return PTR_ERR(cred);
4689
4690         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4691         if (IS_ERR(olabel)) {
4692                 status = -PTR_ERR(olabel);
4693                 goto out;
4694         }
4695
4696         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4697         if (status == 0)
4698                 nfs_setsecurity(inode, &fattr, olabel);
4699
4700         nfs4_label_free(olabel);
4701 out:
4702         put_rpccred(cred);
4703         return status;
4704 }
4705 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4706
4707
4708 static int
4709 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4710 {
4711         struct nfs_client *clp = server->nfs_client;
4712
4713         if (task->tk_status >= 0)
4714                 return 0;
4715         switch(task->tk_status) {
4716                 case -NFS4ERR_DELEG_REVOKED:
4717                 case -NFS4ERR_ADMIN_REVOKED:
4718                 case -NFS4ERR_BAD_STATEID:
4719                         if (state == NULL)
4720                                 break;
4721                         nfs_remove_bad_delegation(state->inode);
4722                 case -NFS4ERR_OPENMODE:
4723                         if (state == NULL)
4724                                 break;
4725                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4726                                 goto stateid_invalid;
4727                         goto wait_on_recovery;
4728                 case -NFS4ERR_EXPIRED:
4729                         if (state != NULL) {
4730                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4731                                         goto stateid_invalid;
4732                         }
4733                 case -NFS4ERR_STALE_STATEID:
4734                 case -NFS4ERR_STALE_CLIENTID:
4735                         nfs4_schedule_lease_recovery(clp);
4736                         goto wait_on_recovery;
4737 #if defined(CONFIG_NFS_V4_1)
4738                 case -NFS4ERR_BADSESSION:
4739                 case -NFS4ERR_BADSLOT:
4740                 case -NFS4ERR_BAD_HIGH_SLOT:
4741                 case -NFS4ERR_DEADSESSION:
4742                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4743                 case -NFS4ERR_SEQ_FALSE_RETRY:
4744                 case -NFS4ERR_SEQ_MISORDERED:
4745                         dprintk("%s ERROR %d, Reset session\n", __func__,
4746                                 task->tk_status);
4747                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4748                         task->tk_status = 0;
4749                         return -EAGAIN;
4750 #endif /* CONFIG_NFS_V4_1 */
4751                 case -NFS4ERR_DELAY:
4752                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4753                 case -NFS4ERR_GRACE:
4754                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4755                         task->tk_status = 0;
4756                         return -EAGAIN;
4757                 case -NFS4ERR_RETRY_UNCACHED_REP:
4758                 case -NFS4ERR_OLD_STATEID:
4759                         task->tk_status = 0;
4760                         return -EAGAIN;
4761         }
4762         task->tk_status = nfs4_map_errors(task->tk_status);
4763         return 0;
4764 stateid_invalid:
4765         task->tk_status = -EIO;
4766         return 0;
4767 wait_on_recovery:
4768         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4769         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4770                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4771         task->tk_status = 0;
4772         return -EAGAIN;
4773 }
4774
4775 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4776                                     nfs4_verifier *bootverf)
4777 {
4778         __be32 verf[2];
4779
4780         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4781                 /* An impossible timestamp guarantees this value
4782                  * will never match a generated boot time. */
4783                 verf[0] = 0;
4784                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4785         } else {
4786                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4787                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4788                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4789         }
4790         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4791 }
4792
4793 static unsigned int
4794 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4795                                    char *buf, size_t len)
4796 {
4797         unsigned int result;
4798
4799         rcu_read_lock();
4800         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4801                                 clp->cl_ipaddr,
4802                                 rpc_peeraddr2str(clp->cl_rpcclient,
4803                                                         RPC_DISPLAY_ADDR),
4804                                 rpc_peeraddr2str(clp->cl_rpcclient,
4805                                                         RPC_DISPLAY_PROTO));
4806         rcu_read_unlock();
4807         return result;
4808 }
4809
4810 static unsigned int
4811 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4812                                 char *buf, size_t len)
4813 {
4814         const char *nodename = clp->cl_rpcclient->cl_nodename;
4815
4816         if (nfs4_client_id_uniquifier[0] != '\0')
4817                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4818                                 clp->rpc_ops->version,
4819                                 clp->cl_minorversion,
4820                                 nfs4_client_id_uniquifier,
4821                                 nodename);
4822         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4823                                 clp->rpc_ops->version, clp->cl_minorversion,
4824                                 nodename);
4825 }
4826
4827 /**
4828  * nfs4_proc_setclientid - Negotiate client ID
4829  * @clp: state data structure
4830  * @program: RPC program for NFSv4 callback service
4831  * @port: IP port number for NFS4 callback service
4832  * @cred: RPC credential to use for this call
4833  * @res: where to place the result
4834  *
4835  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4836  */
4837 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4838                 unsigned short port, struct rpc_cred *cred,
4839                 struct nfs4_setclientid_res *res)
4840 {
4841         nfs4_verifier sc_verifier;
4842         struct nfs4_setclientid setclientid = {
4843                 .sc_verifier = &sc_verifier,
4844                 .sc_prog = program,
4845                 .sc_cb_ident = clp->cl_cb_ident,
4846         };
4847         struct rpc_message msg = {
4848                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4849                 .rpc_argp = &setclientid,
4850                 .rpc_resp = res,
4851                 .rpc_cred = cred,
4852         };
4853         int status;
4854
4855         /* nfs_client_id4 */
4856         nfs4_init_boot_verifier(clp, &sc_verifier);
4857         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4858                 setclientid.sc_name_len =
4859                                 nfs4_init_uniform_client_string(clp,
4860                                                 setclientid.sc_name,
4861                                                 sizeof(setclientid.sc_name));
4862         else
4863                 setclientid.sc_name_len =
4864                                 nfs4_init_nonuniform_client_string(clp,
4865                                                 setclientid.sc_name,
4866                                                 sizeof(setclientid.sc_name));
4867         /* cb_client4 */
4868         rcu_read_lock();
4869         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4870                                 sizeof(setclientid.sc_netid), "%s",
4871                                 rpc_peeraddr2str(clp->cl_rpcclient,
4872                                                         RPC_DISPLAY_NETID));
4873         rcu_read_unlock();
4874         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4875                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4876                                 clp->cl_ipaddr, port >> 8, port & 255);
4877
4878         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4879                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4880                 setclientid.sc_name_len, setclientid.sc_name);
4881         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4882         trace_nfs4_setclientid(clp, status);
4883         dprintk("NFS reply setclientid: %d\n", status);
4884         return status;
4885 }
4886
4887 /**
4888  * nfs4_proc_setclientid_confirm - Confirm client ID
4889  * @clp: state data structure
4890  * @res: result of a previous SETCLIENTID
4891  * @cred: RPC credential to use for this call
4892  *
4893  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4894  */
4895 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4896                 struct nfs4_setclientid_res *arg,
4897                 struct rpc_cred *cred)
4898 {
4899         struct rpc_message msg = {
4900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4901                 .rpc_argp = arg,
4902                 .rpc_cred = cred,
4903         };
4904         int status;
4905
4906         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4907                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4908                 clp->cl_clientid);
4909         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4910         trace_nfs4_setclientid_confirm(clp, status);
4911         dprintk("NFS reply setclientid_confirm: %d\n", status);
4912         return status;
4913 }
4914
4915 struct nfs4_delegreturndata {
4916         struct nfs4_delegreturnargs args;
4917         struct nfs4_delegreturnres res;
4918         struct nfs_fh fh;
4919         nfs4_stateid stateid;
4920         unsigned long timestamp;
4921         struct nfs_fattr fattr;
4922         int rpc_status;
4923 };
4924
4925 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4926 {
4927         struct nfs4_delegreturndata *data = calldata;
4928
4929         if (!nfs4_sequence_done(task, &data->res.seq_res))
4930                 return;
4931
4932         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4933         switch (task->tk_status) {
4934         case -NFS4ERR_STALE_STATEID:
4935         case -NFS4ERR_EXPIRED:
4936         case 0:
4937                 renew_lease(data->res.server, data->timestamp);
4938                 break;
4939         default:
4940                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4941                                 -EAGAIN) {
4942                         rpc_restart_call_prepare(task);
4943                         return;
4944                 }
4945         }
4946         data->rpc_status = task->tk_status;
4947 }
4948
4949 static void nfs4_delegreturn_release(void *calldata)
4950 {
4951         kfree(calldata);
4952 }
4953
4954 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4955 {
4956         struct nfs4_delegreturndata *d_data;
4957
4958         d_data = (struct nfs4_delegreturndata *)data;
4959
4960         nfs4_setup_sequence(d_data->res.server,
4961                         &d_data->args.seq_args,
4962                         &d_data->res.seq_res,
4963                         task);
4964 }
4965
4966 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4967         .rpc_call_prepare = nfs4_delegreturn_prepare,
4968         .rpc_call_done = nfs4_delegreturn_done,
4969         .rpc_release = nfs4_delegreturn_release,
4970 };
4971
4972 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4973 {
4974         struct nfs4_delegreturndata *data;
4975         struct nfs_server *server = NFS_SERVER(inode);
4976         struct rpc_task *task;
4977         struct rpc_message msg = {
4978                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4979                 .rpc_cred = cred,
4980         };
4981         struct rpc_task_setup task_setup_data = {
4982                 .rpc_client = server->client,
4983                 .rpc_message = &msg,
4984                 .callback_ops = &nfs4_delegreturn_ops,
4985                 .flags = RPC_TASK_ASYNC,
4986         };
4987         int status = 0;
4988
4989         data = kzalloc(sizeof(*data), GFP_NOFS);
4990         if (data == NULL)
4991                 return -ENOMEM;
4992         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4993         data->args.fhandle = &data->fh;
4994         data->args.stateid = &data->stateid;
4995         data->args.bitmask = server->cache_consistency_bitmask;
4996         nfs_copy_fh(&data->fh, NFS_FH(inode));
4997         nfs4_stateid_copy(&data->stateid, stateid);
4998         data->res.fattr = &data->fattr;
4999         data->res.server = server;
5000         nfs_fattr_init(data->res.fattr);
5001         data->timestamp = jiffies;
5002         data->rpc_status = 0;
5003
5004         task_setup_data.callback_data = data;
5005         msg.rpc_argp = &data->args;
5006         msg.rpc_resp = &data->res;
5007         task = rpc_run_task(&task_setup_data);
5008         if (IS_ERR(task))
5009                 return PTR_ERR(task);
5010         if (!issync)
5011                 goto out;
5012         status = nfs4_wait_for_completion_rpc_task(task);
5013         if (status != 0)
5014                 goto out;
5015         status = data->rpc_status;
5016         if (status == 0)
5017                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5018         else
5019                 nfs_refresh_inode(inode, &data->fattr);
5020 out:
5021         rpc_put_task(task);
5022         return status;
5023 }
5024
5025 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5026 {
5027         struct nfs_server *server = NFS_SERVER(inode);
5028         struct nfs4_exception exception = { };
5029         int err;
5030         do {
5031                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5032                 trace_nfs4_delegreturn(inode, err);
5033                 switch (err) {
5034                         case -NFS4ERR_STALE_STATEID:
5035                         case -NFS4ERR_EXPIRED:
5036                         case 0:
5037                                 return 0;
5038                 }
5039                 err = nfs4_handle_exception(server, err, &exception);
5040         } while (exception.retry);
5041         return err;
5042 }
5043
5044 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5045 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5046
5047 /*
5048  * sleep, with exponential backoff, and retry the LOCK operation.
5049  */
5050 static unsigned long
5051 nfs4_set_lock_task_retry(unsigned long timeout)
5052 {
5053         freezable_schedule_timeout_killable_unsafe(timeout);
5054         timeout <<= 1;
5055         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5056                 return NFS4_LOCK_MAXTIMEOUT;
5057         return timeout;
5058 }
5059
5060 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5061 {
5062         struct inode *inode = state->inode;
5063         struct nfs_server *server = NFS_SERVER(inode);
5064         struct nfs_client *clp = server->nfs_client;
5065         struct nfs_lockt_args arg = {
5066                 .fh = NFS_FH(inode),
5067                 .fl = request,
5068         };
5069         struct nfs_lockt_res res = {
5070                 .denied = request,
5071         };
5072         struct rpc_message msg = {
5073                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5074                 .rpc_argp       = &arg,
5075                 .rpc_resp       = &res,
5076                 .rpc_cred       = state->owner->so_cred,
5077         };
5078         struct nfs4_lock_state *lsp;
5079         int status;
5080
5081         arg.lock_owner.clientid = clp->cl_clientid;
5082         status = nfs4_set_lock_state(state, request);
5083         if (status != 0)
5084                 goto out;
5085         lsp = request->fl_u.nfs4_fl.owner;
5086         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5087         arg.lock_owner.s_dev = server->s_dev;
5088         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5089         switch (status) {
5090                 case 0:
5091                         request->fl_type = F_UNLCK;
5092                         break;
5093                 case -NFS4ERR_DENIED:
5094                         status = 0;
5095         }
5096         request->fl_ops->fl_release_private(request);
5097 out:
5098         return status;
5099 }
5100
5101 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5102 {
5103         struct nfs4_exception exception = { };
5104         int err;
5105
5106         do {
5107                 err = _nfs4_proc_getlk(state, cmd, request);
5108                 trace_nfs4_get_lock(request, state, cmd, err);
5109                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5110                                 &exception);
5111         } while (exception.retry);
5112         return err;
5113 }
5114
5115 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5116 {
5117         int res = 0;
5118         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5119                 case FL_POSIX:
5120                         res = posix_lock_file_wait(file, fl);
5121                         break;
5122                 case FL_FLOCK:
5123                         res = flock_lock_file_wait(file, fl);
5124                         break;
5125                 default:
5126                         BUG();
5127         }
5128         return res;
5129 }
5130
5131 struct nfs4_unlockdata {
5132         struct nfs_locku_args arg;
5133         struct nfs_locku_res res;
5134         struct nfs4_lock_state *lsp;
5135         struct nfs_open_context *ctx;
5136         struct file_lock fl;
5137         const struct nfs_server *server;
5138         unsigned long timestamp;
5139 };
5140
5141 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5142                 struct nfs_open_context *ctx,
5143                 struct nfs4_lock_state *lsp,
5144                 struct nfs_seqid *seqid)
5145 {
5146         struct nfs4_unlockdata *p;
5147         struct inode *inode = lsp->ls_state->inode;
5148
5149         p = kzalloc(sizeof(*p), GFP_NOFS);
5150         if (p == NULL)
5151                 return NULL;
5152         p->arg.fh = NFS_FH(inode);
5153         p->arg.fl = &p->fl;
5154         p->arg.seqid = seqid;
5155         p->res.seqid = seqid;
5156         p->arg.stateid = &lsp->ls_stateid;
5157         p->lsp = lsp;
5158         atomic_inc(&lsp->ls_count);
5159         /* Ensure we don't close file until we're done freeing locks! */
5160         p->ctx = get_nfs_open_context(ctx);
5161         memcpy(&p->fl, fl, sizeof(p->fl));
5162         p->server = NFS_SERVER(inode);
5163         return p;
5164 }
5165
5166 static void nfs4_locku_release_calldata(void *data)
5167 {
5168         struct nfs4_unlockdata *calldata = data;
5169         nfs_free_seqid(calldata->arg.seqid);
5170         nfs4_put_lock_state(calldata->lsp);
5171         put_nfs_open_context(calldata->ctx);
5172         kfree(calldata);
5173 }
5174
5175 static void nfs4_locku_done(struct rpc_task *task, void *data)
5176 {
5177         struct nfs4_unlockdata *calldata = data;
5178
5179         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5180                 return;
5181         switch (task->tk_status) {
5182                 case 0:
5183                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5184                                         &calldata->res.stateid);
5185                         renew_lease(calldata->server, calldata->timestamp);
5186                         break;
5187                 case -NFS4ERR_BAD_STATEID:
5188                 case -NFS4ERR_OLD_STATEID:
5189                 case -NFS4ERR_STALE_STATEID:
5190                 case -NFS4ERR_EXPIRED:
5191                         break;
5192                 default:
5193                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5194                                 rpc_restart_call_prepare(task);
5195         }
5196         nfs_release_seqid(calldata->arg.seqid);
5197 }
5198
5199 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5200 {
5201         struct nfs4_unlockdata *calldata = data;
5202
5203         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5204                 goto out_wait;
5205         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5206                 /* Note: exit _without_ running nfs4_locku_done */
5207                 goto out_no_action;
5208         }
5209         calldata->timestamp = jiffies;
5210         if (nfs4_setup_sequence(calldata->server,
5211                                 &calldata->arg.seq_args,
5212                                 &calldata->res.seq_res,
5213                                 task) != 0)
5214                 nfs_release_seqid(calldata->arg.seqid);
5215         return;
5216 out_no_action:
5217         task->tk_action = NULL;
5218 out_wait:
5219         nfs4_sequence_done(task, &calldata->res.seq_res);
5220 }
5221
5222 static const struct rpc_call_ops nfs4_locku_ops = {
5223         .rpc_call_prepare = nfs4_locku_prepare,
5224         .rpc_call_done = nfs4_locku_done,
5225         .rpc_release = nfs4_locku_release_calldata,
5226 };
5227
5228 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5229                 struct nfs_open_context *ctx,
5230                 struct nfs4_lock_state *lsp,
5231                 struct nfs_seqid *seqid)
5232 {
5233         struct nfs4_unlockdata *data;
5234         struct rpc_message msg = {
5235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5236                 .rpc_cred = ctx->cred,
5237         };
5238         struct rpc_task_setup task_setup_data = {
5239                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5240                 .rpc_message = &msg,
5241                 .callback_ops = &nfs4_locku_ops,
5242                 .workqueue = nfsiod_workqueue,
5243                 .flags = RPC_TASK_ASYNC,
5244         };
5245
5246         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5247                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5248
5249         /* Ensure this is an unlock - when canceling a lock, the
5250          * canceled lock is passed in, and it won't be an unlock.
5251          */
5252         fl->fl_type = F_UNLCK;
5253
5254         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5255         if (data == NULL) {
5256                 nfs_free_seqid(seqid);
5257                 return ERR_PTR(-ENOMEM);
5258         }
5259
5260         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5261         msg.rpc_argp = &data->arg;
5262         msg.rpc_resp = &data->res;
5263         task_setup_data.callback_data = data;
5264         return rpc_run_task(&task_setup_data);
5265 }
5266
5267 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5268 {
5269         struct inode *inode = state->inode;
5270         struct nfs4_state_owner *sp = state->owner;
5271         struct nfs_inode *nfsi = NFS_I(inode);
5272         struct nfs_seqid *seqid;
5273         struct nfs4_lock_state *lsp;
5274         struct rpc_task *task;
5275         int status = 0;
5276         unsigned char fl_flags = request->fl_flags;
5277
5278         status = nfs4_set_lock_state(state, request);
5279         /* Unlock _before_ we do the RPC call */
5280         request->fl_flags |= FL_EXISTS;
5281         /* Exclude nfs_delegation_claim_locks() */
5282         mutex_lock(&sp->so_delegreturn_mutex);
5283         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5284         down_read(&nfsi->rwsem);
5285         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5286                 up_read(&nfsi->rwsem);
5287                 mutex_unlock(&sp->so_delegreturn_mutex);
5288                 goto out;
5289         }
5290         up_read(&nfsi->rwsem);
5291         mutex_unlock(&sp->so_delegreturn_mutex);
5292         if (status != 0)
5293                 goto out;
5294         /* Is this a delegated lock? */
5295         lsp = request->fl_u.nfs4_fl.owner;
5296         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5297                 goto out;
5298         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5299         status = -ENOMEM;
5300         if (seqid == NULL)
5301                 goto out;
5302         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5303         status = PTR_ERR(task);
5304         if (IS_ERR(task))
5305                 goto out;
5306         status = nfs4_wait_for_completion_rpc_task(task);
5307         rpc_put_task(task);
5308 out:
5309         request->fl_flags = fl_flags;
5310         trace_nfs4_unlock(request, state, F_SETLK, status);
5311         return status;
5312 }
5313
5314 struct nfs4_lockdata {
5315         struct nfs_lock_args arg;
5316         struct nfs_lock_res res;
5317         struct nfs4_lock_state *lsp;
5318         struct nfs_open_context *ctx;
5319         struct file_lock fl;
5320         unsigned long timestamp;
5321         int rpc_status;
5322         int cancelled;
5323         struct nfs_server *server;
5324 };
5325
5326 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5327                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5328                 gfp_t gfp_mask)
5329 {
5330         struct nfs4_lockdata *p;
5331         struct inode *inode = lsp->ls_state->inode;
5332         struct nfs_server *server = NFS_SERVER(inode);
5333
5334         p = kzalloc(sizeof(*p), gfp_mask);
5335         if (p == NULL)
5336                 return NULL;
5337
5338         p->arg.fh = NFS_FH(inode);
5339         p->arg.fl = &p->fl;
5340         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5341         if (p->arg.open_seqid == NULL)
5342                 goto out_free;
5343         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5344         if (p->arg.lock_seqid == NULL)
5345                 goto out_free_seqid;
5346         p->arg.lock_stateid = &lsp->ls_stateid;
5347         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5348         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5349         p->arg.lock_owner.s_dev = server->s_dev;
5350         p->res.lock_seqid = p->arg.lock_seqid;
5351         p->lsp = lsp;
5352         p->server = server;
5353         atomic_inc(&lsp->ls_count);
5354         p->ctx = get_nfs_open_context(ctx);
5355         memcpy(&p->fl, fl, sizeof(p->fl));
5356         return p;
5357 out_free_seqid:
5358         nfs_free_seqid(p->arg.open_seqid);
5359 out_free:
5360         kfree(p);
5361         return NULL;
5362 }
5363
5364 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5365 {
5366         struct nfs4_lockdata *data = calldata;
5367         struct nfs4_state *state = data->lsp->ls_state;
5368
5369         dprintk("%s: begin!\n", __func__);
5370         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5371                 goto out_wait;
5372         /* Do we need to do an open_to_lock_owner? */
5373         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5374                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5375                         goto out_release_lock_seqid;
5376                 }
5377                 data->arg.open_stateid = &state->open_stateid;
5378                 data->arg.new_lock_owner = 1;
5379                 data->res.open_seqid = data->arg.open_seqid;
5380         } else
5381                 data->arg.new_lock_owner = 0;
5382         if (!nfs4_valid_open_stateid(state)) {
5383                 data->rpc_status = -EBADF;
5384                 task->tk_action = NULL;
5385                 goto out_release_open_seqid;
5386         }
5387         data->timestamp = jiffies;
5388         if (nfs4_setup_sequence(data->server,
5389                                 &data->arg.seq_args,
5390                                 &data->res.seq_res,
5391                                 task) == 0)
5392                 return;
5393 out_release_open_seqid:
5394         nfs_release_seqid(data->arg.open_seqid);
5395 out_release_lock_seqid:
5396         nfs_release_seqid(data->arg.lock_seqid);
5397 out_wait:
5398         nfs4_sequence_done(task, &data->res.seq_res);
5399         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5400 }
5401
5402 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5403 {
5404         struct nfs4_lockdata *data = calldata;
5405
5406         dprintk("%s: begin!\n", __func__);
5407
5408         if (!nfs4_sequence_done(task, &data->res.seq_res))
5409                 return;
5410
5411         data->rpc_status = task->tk_status;
5412         if (data->arg.new_lock_owner != 0) {
5413                 if (data->rpc_status == 0)
5414                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5415                 else
5416                         goto out;
5417         }
5418         if (data->rpc_status == 0) {
5419                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5420                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5421                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5422         }
5423 out:
5424         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5425 }
5426
5427 static void nfs4_lock_release(void *calldata)
5428 {
5429         struct nfs4_lockdata *data = calldata;
5430
5431         dprintk("%s: begin!\n", __func__);
5432         nfs_free_seqid(data->arg.open_seqid);
5433         if (data->cancelled != 0) {
5434                 struct rpc_task *task;
5435                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5436                                 data->arg.lock_seqid);
5437                 if (!IS_ERR(task))
5438                         rpc_put_task_async(task);
5439                 dprintk("%s: cancelling lock!\n", __func__);
5440         } else
5441                 nfs_free_seqid(data->arg.lock_seqid);
5442         nfs4_put_lock_state(data->lsp);
5443         put_nfs_open_context(data->ctx);
5444         kfree(data);
5445         dprintk("%s: done!\n", __func__);
5446 }
5447
5448 static const struct rpc_call_ops nfs4_lock_ops = {
5449         .rpc_call_prepare = nfs4_lock_prepare,
5450         .rpc_call_done = nfs4_lock_done,
5451         .rpc_release = nfs4_lock_release,
5452 };
5453
5454 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5455 {
5456         switch (error) {
5457         case -NFS4ERR_ADMIN_REVOKED:
5458         case -NFS4ERR_BAD_STATEID:
5459                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5460                 if (new_lock_owner != 0 ||
5461                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5462                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5463                 break;
5464         case -NFS4ERR_STALE_STATEID:
5465                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5466         case -NFS4ERR_EXPIRED:
5467                 nfs4_schedule_lease_recovery(server->nfs_client);
5468         };
5469 }
5470
5471 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5472 {
5473         struct nfs4_lockdata *data;
5474         struct rpc_task *task;
5475         struct rpc_message msg = {
5476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5477                 .rpc_cred = state->owner->so_cred,
5478         };
5479         struct rpc_task_setup task_setup_data = {
5480                 .rpc_client = NFS_CLIENT(state->inode),
5481                 .rpc_message = &msg,
5482                 .callback_ops = &nfs4_lock_ops,
5483                 .workqueue = nfsiod_workqueue,
5484                 .flags = RPC_TASK_ASYNC,
5485         };
5486         int ret;
5487
5488         dprintk("%s: begin!\n", __func__);
5489         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5490                         fl->fl_u.nfs4_fl.owner,
5491                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5492         if (data == NULL)
5493                 return -ENOMEM;
5494         if (IS_SETLKW(cmd))
5495                 data->arg.block = 1;
5496         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5497         msg.rpc_argp = &data->arg;
5498         msg.rpc_resp = &data->res;
5499         task_setup_data.callback_data = data;
5500         if (recovery_type > NFS_LOCK_NEW) {
5501                 if (recovery_type == NFS_LOCK_RECLAIM)
5502                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5503                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5504         }
5505         task = rpc_run_task(&task_setup_data);
5506         if (IS_ERR(task))
5507                 return PTR_ERR(task);
5508         ret = nfs4_wait_for_completion_rpc_task(task);
5509         if (ret == 0) {
5510                 ret = data->rpc_status;
5511                 if (ret)
5512                         nfs4_handle_setlk_error(data->server, data->lsp,
5513                                         data->arg.new_lock_owner, ret);
5514         } else
5515                 data->cancelled = 1;
5516         rpc_put_task(task);
5517         dprintk("%s: done, ret = %d!\n", __func__, ret);
5518         return ret;
5519 }
5520
5521 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5522 {
5523         struct nfs_server *server = NFS_SERVER(state->inode);
5524         struct nfs4_exception exception = {
5525                 .inode = state->inode,
5526         };
5527         int err;
5528
5529         do {
5530                 /* Cache the lock if possible... */
5531                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5532                         return 0;
5533                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5534                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5535                 if (err != -NFS4ERR_DELAY)
5536                         break;
5537                 nfs4_handle_exception(server, err, &exception);
5538         } while (exception.retry);
5539         return err;
5540 }
5541
5542 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5543 {
5544         struct nfs_server *server = NFS_SERVER(state->inode);
5545         struct nfs4_exception exception = {
5546                 .inode = state->inode,
5547         };
5548         int err;
5549
5550         err = nfs4_set_lock_state(state, request);
5551         if (err != 0)
5552                 return err;
5553         if (!recover_lost_locks) {
5554                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5555                 return 0;
5556         }
5557         do {
5558                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5559                         return 0;
5560                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5561                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5562                 switch (err) {
5563                 default:
5564                         goto out;
5565                 case -NFS4ERR_GRACE:
5566                 case -NFS4ERR_DELAY:
5567                         nfs4_handle_exception(server, err, &exception);
5568                         err = 0;
5569                 }
5570         } while (exception.retry);
5571 out:
5572         return err;
5573 }
5574
5575 #if defined(CONFIG_NFS_V4_1)
5576 /**
5577  * nfs41_check_expired_locks - possibly free a lock stateid
5578  *
5579  * @state: NFSv4 state for an inode
5580  *
5581  * Returns NFS_OK if recovery for this stateid is now finished.
5582  * Otherwise a negative NFS4ERR value is returned.
5583  */
5584 static int nfs41_check_expired_locks(struct nfs4_state *state)
5585 {
5586         int status, ret = -NFS4ERR_BAD_STATEID;
5587         struct nfs4_lock_state *lsp;
5588         struct nfs_server *server = NFS_SERVER(state->inode);
5589
5590         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5591                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5592                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5593
5594                         status = nfs41_test_stateid(server,
5595                                         &lsp->ls_stateid,
5596                                         cred);
5597                         trace_nfs4_test_lock_stateid(state, lsp, status);
5598                         if (status != NFS_OK) {
5599                                 /* Free the stateid unless the server
5600                                  * informs us the stateid is unrecognized. */
5601                                 if (status != -NFS4ERR_BAD_STATEID)
5602                                         nfs41_free_stateid(server,
5603                                                         &lsp->ls_stateid,
5604                                                         cred);
5605                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5606                                 ret = status;
5607                         }
5608                 }
5609         };
5610
5611         return ret;
5612 }
5613
5614 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5615 {
5616         int status = NFS_OK;
5617
5618         if (test_bit(LK_STATE_IN_USE, &state->flags))
5619                 status = nfs41_check_expired_locks(state);
5620         if (status != NFS_OK)
5621                 status = nfs4_lock_expired(state, request);
5622         return status;
5623 }
5624 #endif
5625
5626 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5627 {
5628         struct nfs4_state_owner *sp = state->owner;
5629         struct nfs_inode *nfsi = NFS_I(state->inode);
5630         unsigned char fl_flags = request->fl_flags;
5631         unsigned int seq;
5632         int status = -ENOLCK;
5633
5634         if ((fl_flags & FL_POSIX) &&
5635                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5636                 goto out;
5637         /* Is this a delegated open? */
5638         status = nfs4_set_lock_state(state, request);
5639         if (status != 0)
5640                 goto out;
5641         request->fl_flags |= FL_ACCESS;
5642         status = do_vfs_lock(request->fl_file, request);
5643         if (status < 0)
5644                 goto out;
5645         down_read(&nfsi->rwsem);
5646         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5647                 /* Yes: cache locks! */
5648                 /* ...but avoid races with delegation recall... */
5649                 request->fl_flags = fl_flags & ~FL_SLEEP;
5650                 status = do_vfs_lock(request->fl_file, request);
5651                 goto out_unlock;
5652         }
5653         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5654         up_read(&nfsi->rwsem);
5655         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5656         if (status != 0)
5657                 goto out;
5658         down_read(&nfsi->rwsem);
5659         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5660                 status = -NFS4ERR_DELAY;
5661                 goto out_unlock;
5662         }
5663         /* Note: we always want to sleep here! */
5664         request->fl_flags = fl_flags | FL_SLEEP;
5665         if (do_vfs_lock(request->fl_file, request) < 0)
5666                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5667                         "manager!\n", __func__);
5668 out_unlock:
5669         up_read(&nfsi->rwsem);
5670 out:
5671         request->fl_flags = fl_flags;
5672         return status;
5673 }
5674
5675 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5676 {
5677         struct nfs4_exception exception = {
5678                 .state = state,
5679                 .inode = state->inode,
5680         };
5681         int err;
5682
5683         do {
5684                 err = _nfs4_proc_setlk(state, cmd, request);
5685                 trace_nfs4_set_lock(request, state, cmd, err);
5686                 if (err == -NFS4ERR_DENIED)
5687                         err = -EAGAIN;
5688                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5689                                 err, &exception);
5690         } while (exception.retry);
5691         return err;
5692 }
5693
5694 static int
5695 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5696 {
5697         struct nfs_open_context *ctx;
5698         struct nfs4_state *state;
5699         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5700         int status;
5701
5702         /* verify open state */
5703         ctx = nfs_file_open_context(filp);
5704         state = ctx->state;
5705
5706         if (request->fl_start < 0 || request->fl_end < 0)
5707                 return -EINVAL;
5708
5709         if (IS_GETLK(cmd)) {
5710                 if (state != NULL)
5711                         return nfs4_proc_getlk(state, F_GETLK, request);
5712                 return 0;
5713         }
5714
5715         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5716                 return -EINVAL;
5717
5718         if (request->fl_type == F_UNLCK) {
5719                 if (state != NULL)
5720                         return nfs4_proc_unlck(state, cmd, request);
5721                 return 0;
5722         }
5723
5724         if (state == NULL)
5725                 return -ENOLCK;
5726         /*
5727          * Don't rely on the VFS having checked the file open mode,
5728          * since it won't do this for flock() locks.
5729          */
5730         switch (request->fl_type) {
5731         case F_RDLCK:
5732                 if (!(filp->f_mode & FMODE_READ))
5733                         return -EBADF;
5734                 break;
5735         case F_WRLCK:
5736                 if (!(filp->f_mode & FMODE_WRITE))
5737                         return -EBADF;
5738         }
5739
5740         do {
5741                 status = nfs4_proc_setlk(state, cmd, request);
5742                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5743                         break;
5744                 timeout = nfs4_set_lock_task_retry(timeout);
5745                 status = -ERESTARTSYS;
5746                 if (signalled())
5747                         break;
5748         } while(status < 0);
5749         return status;
5750 }
5751
5752 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5753 {
5754         struct nfs_server *server = NFS_SERVER(state->inode);
5755         int err;
5756
5757         err = nfs4_set_lock_state(state, fl);
5758         if (err != 0)
5759                 return err;
5760         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5761         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5762 }
5763
5764 struct nfs_release_lockowner_data {
5765         struct nfs4_lock_state *lsp;
5766         struct nfs_server *server;
5767         struct nfs_release_lockowner_args args;
5768         struct nfs4_sequence_args seq_args;
5769         struct nfs4_sequence_res seq_res;
5770 };
5771
5772 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5773 {
5774         struct nfs_release_lockowner_data *data = calldata;
5775         nfs40_setup_sequence(data->server,
5776                                 &data->seq_args, &data->seq_res, task);
5777 }
5778
5779 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5780 {
5781         struct nfs_release_lockowner_data *data = calldata;
5782         nfs40_sequence_done(task, &data->seq_res);
5783 }
5784
5785 static void nfs4_release_lockowner_release(void *calldata)
5786 {
5787         struct nfs_release_lockowner_data *data = calldata;
5788         nfs4_free_lock_state(data->server, data->lsp);
5789         kfree(calldata);
5790 }
5791
5792 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5793         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5794         .rpc_call_done = nfs4_release_lockowner_done,
5795         .rpc_release = nfs4_release_lockowner_release,
5796 };
5797
5798 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5799 {
5800         struct nfs_release_lockowner_data *data;
5801         struct rpc_message msg = {
5802                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5803         };
5804
5805         if (server->nfs_client->cl_mvops->minor_version != 0)
5806                 return -EINVAL;
5807
5808         data = kmalloc(sizeof(*data), GFP_NOFS);
5809         if (!data)
5810                 return -ENOMEM;
5811         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5812         data->lsp = lsp;
5813         data->server = server;
5814         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5815         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5816         data->args.lock_owner.s_dev = server->s_dev;
5817
5818         msg.rpc_argp = &data->args;
5819         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5820         return 0;
5821 }
5822
5823 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5824
5825 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5826                                    const void *buf, size_t buflen,
5827                                    int flags, int type)
5828 {
5829         if (strcmp(key, "") != 0)
5830                 return -EINVAL;
5831
5832         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5833 }
5834
5835 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5836                                    void *buf, size_t buflen, int type)
5837 {
5838         if (strcmp(key, "") != 0)
5839                 return -EINVAL;
5840
5841         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5842 }
5843
5844 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5845                                        size_t list_len, const char *name,
5846                                        size_t name_len, int type)
5847 {
5848         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5849
5850         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5851                 return 0;
5852
5853         if (list && len <= list_len)
5854                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5855         return len;
5856 }
5857
5858 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5859 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5860 {
5861         return server->caps & NFS_CAP_SECURITY_LABEL;
5862 }
5863
5864 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5865                                    const void *buf, size_t buflen,
5866                                    int flags, int type)
5867 {
5868         if (security_ismaclabel(key))
5869                 return nfs4_set_security_label(dentry, buf, buflen);
5870
5871         return -EOPNOTSUPP;
5872 }
5873
5874 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5875                                    void *buf, size_t buflen, int type)
5876 {
5877         if (security_ismaclabel(key))
5878                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5879         return -EOPNOTSUPP;
5880 }
5881
5882 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5883                                        size_t list_len, const char *name,
5884                                        size_t name_len, int type)
5885 {
5886         size_t len = 0;
5887
5888         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5889                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5890                 if (list && len <= list_len)
5891                         security_inode_listsecurity(dentry->d_inode, list, len);
5892         }
5893         return len;
5894 }
5895
5896 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5897         .prefix = XATTR_SECURITY_PREFIX,
5898         .list   = nfs4_xattr_list_nfs4_label,
5899         .get    = nfs4_xattr_get_nfs4_label,
5900         .set    = nfs4_xattr_set_nfs4_label,
5901 };
5902 #endif
5903
5904
5905 /*
5906  * nfs_fhget will use either the mounted_on_fileid or the fileid
5907  */
5908 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5909 {
5910         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5911                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5912               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5913               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5914                 return;
5915
5916         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5917                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5918         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5919         fattr->nlink = 2;
5920 }
5921
5922 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5923                                    const struct qstr *name,
5924                                    struct nfs4_fs_locations *fs_locations,
5925                                    struct page *page)
5926 {
5927         struct nfs_server *server = NFS_SERVER(dir);
5928         u32 bitmask[3] = {
5929                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5930         };
5931         struct nfs4_fs_locations_arg args = {
5932                 .dir_fh = NFS_FH(dir),
5933                 .name = name,
5934                 .page = page,
5935                 .bitmask = bitmask,
5936         };
5937         struct nfs4_fs_locations_res res = {
5938                 .fs_locations = fs_locations,
5939         };
5940         struct rpc_message msg = {
5941                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5942                 .rpc_argp = &args,
5943                 .rpc_resp = &res,
5944         };
5945         int status;
5946
5947         dprintk("%s: start\n", __func__);
5948
5949         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5950          * is not supported */
5951         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5952                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5953         else
5954                 bitmask[0] |= FATTR4_WORD0_FILEID;
5955
5956         nfs_fattr_init(&fs_locations->fattr);
5957         fs_locations->server = server;
5958         fs_locations->nlocations = 0;
5959         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5960         dprintk("%s: returned status = %d\n", __func__, status);
5961         return status;
5962 }
5963
5964 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5965                            const struct qstr *name,
5966                            struct nfs4_fs_locations *fs_locations,
5967                            struct page *page)
5968 {
5969         struct nfs4_exception exception = { };
5970         int err;
5971         do {
5972                 err = _nfs4_proc_fs_locations(client, dir, name,
5973                                 fs_locations, page);
5974                 trace_nfs4_get_fs_locations(dir, name, err);
5975                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5976                                 &exception);
5977         } while (exception.retry);
5978         return err;
5979 }
5980
5981 /**
5982  * If 'use_integrity' is true and the state managment nfs_client
5983  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
5984  * and the machine credential as per RFC3530bis and RFC5661 Security
5985  * Considerations sections. Otherwise, just use the user cred with the
5986  * filesystem's rpc_client.
5987  */
5988 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
5989 {
5990         int status;
5991         struct nfs4_secinfo_arg args = {
5992                 .dir_fh = NFS_FH(dir),
5993                 .name   = name,
5994         };
5995         struct nfs4_secinfo_res res = {
5996                 .flavors     = flavors,
5997         };
5998         struct rpc_message msg = {
5999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6000                 .rpc_argp = &args,
6001                 .rpc_resp = &res,
6002         };
6003         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6004         struct rpc_cred *cred = NULL;
6005
6006         if (use_integrity) {
6007                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6008                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6009                 msg.rpc_cred = cred;
6010         }
6011
6012         dprintk("NFS call  secinfo %s\n", name->name);
6013
6014         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6015                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6016
6017         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6018                                 &res.seq_res, 0);
6019         dprintk("NFS reply  secinfo: %d\n", status);
6020
6021         if (cred)
6022                 put_rpccred(cred);
6023
6024         return status;
6025 }
6026
6027 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6028                       struct nfs4_secinfo_flavors *flavors)
6029 {
6030         struct nfs4_exception exception = { };
6031         int err;
6032         do {
6033                 err = -NFS4ERR_WRONGSEC;
6034
6035                 /* try to use integrity protection with machine cred */
6036                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6037                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6038
6039                 /*
6040                  * if unable to use integrity protection, or SECINFO with
6041                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6042                  * disallowed by spec, but exists in deployed servers) use
6043                  * the current filesystem's rpc_client and the user cred.
6044                  */
6045                 if (err == -NFS4ERR_WRONGSEC)
6046                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6047
6048                 trace_nfs4_secinfo(dir, name, err);
6049                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6050                                 &exception);
6051         } while (exception.retry);
6052         return err;
6053 }
6054
6055 #ifdef CONFIG_NFS_V4_1
6056 /*
6057  * Check the exchange flags returned by the server for invalid flags, having
6058  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6059  * DS flags set.
6060  */
6061 static int nfs4_check_cl_exchange_flags(u32 flags)
6062 {
6063         if (flags & ~EXCHGID4_FLAG_MASK_R)
6064                 goto out_inval;
6065         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6066             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6067                 goto out_inval;
6068         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6069                 goto out_inval;
6070         return NFS_OK;
6071 out_inval:
6072         return -NFS4ERR_INVAL;
6073 }
6074
6075 static bool
6076 nfs41_same_server_scope(struct nfs41_server_scope *a,
6077                         struct nfs41_server_scope *b)
6078 {
6079         if (a->server_scope_sz == b->server_scope_sz &&
6080             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6081                 return true;
6082
6083         return false;
6084 }
6085
6086 /*
6087  * nfs4_proc_bind_conn_to_session()
6088  *
6089  * The 4.1 client currently uses the same TCP connection for the
6090  * fore and backchannel.
6091  */
6092 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6093 {
6094         int status;
6095         struct nfs41_bind_conn_to_session_res res;
6096         struct rpc_message msg = {
6097                 .rpc_proc =
6098                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6099                 .rpc_argp = clp,
6100                 .rpc_resp = &res,
6101                 .rpc_cred = cred,
6102         };
6103
6104         dprintk("--> %s\n", __func__);
6105
6106         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6107         if (unlikely(res.session == NULL)) {
6108                 status = -ENOMEM;
6109                 goto out;
6110         }
6111
6112         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6113         trace_nfs4_bind_conn_to_session(clp, status);
6114         if (status == 0) {
6115                 if (memcmp(res.session->sess_id.data,
6116                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6117                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6118                         status = -EIO;
6119                         goto out_session;
6120                 }
6121                 if (res.dir != NFS4_CDFS4_BOTH) {
6122                         dprintk("NFS: %s: Unexpected direction from server\n",
6123                                 __func__);
6124                         status = -EIO;
6125                         goto out_session;
6126                 }
6127                 if (res.use_conn_in_rdma_mode) {
6128                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6129                                 __func__);
6130                         status = -EIO;
6131                         goto out_session;
6132                 }
6133         }
6134 out_session:
6135         kfree(res.session);
6136 out:
6137         dprintk("<-- %s status= %d\n", __func__, status);
6138         return status;
6139 }
6140
6141 /*
6142  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6143  * and operations we'd like to see to enable certain features in the allow map
6144  */
6145 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6146         .how = SP4_MACH_CRED,
6147         .enforce.u.words = {
6148                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6149                       1 << (OP_EXCHANGE_ID - 32) |
6150                       1 << (OP_CREATE_SESSION - 32) |
6151                       1 << (OP_DESTROY_SESSION - 32) |
6152                       1 << (OP_DESTROY_CLIENTID - 32)
6153         },
6154         .allow.u.words = {
6155                 [0] = 1 << (OP_CLOSE) |
6156                       1 << (OP_LOCKU) |
6157                       1 << (OP_COMMIT),
6158                 [1] = 1 << (OP_SECINFO - 32) |
6159                       1 << (OP_SECINFO_NO_NAME - 32) |
6160                       1 << (OP_TEST_STATEID - 32) |
6161                       1 << (OP_FREE_STATEID - 32) |
6162                       1 << (OP_WRITE - 32)
6163         }
6164 };
6165
6166 /*
6167  * Select the state protection mode for client `clp' given the server results
6168  * from exchange_id in `sp'.
6169  *
6170  * Returns 0 on success, negative errno otherwise.
6171  */
6172 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6173                                  struct nfs41_state_protection *sp)
6174 {
6175         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6176                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6177                       1 << (OP_EXCHANGE_ID - 32) |
6178                       1 << (OP_CREATE_SESSION - 32) |
6179                       1 << (OP_DESTROY_SESSION - 32) |
6180                       1 << (OP_DESTROY_CLIENTID - 32)
6181         };
6182         unsigned int i;
6183
6184         if (sp->how == SP4_MACH_CRED) {
6185                 /* Print state protect result */
6186                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6187                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6188                         if (test_bit(i, sp->enforce.u.longs))
6189                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6190                         if (test_bit(i, sp->allow.u.longs))
6191                                 dfprintk(MOUNT, "  allow op %d\n", i);
6192                 }
6193
6194                 /* make sure nothing is on enforce list that isn't supported */
6195                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6196                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6197                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6198                                 return -EINVAL;
6199                         }
6200                 }
6201
6202                 /*
6203                  * Minimal mode - state operations are allowed to use machine
6204                  * credential.  Note this already happens by default, so the
6205                  * client doesn't have to do anything more than the negotiation.
6206                  *
6207                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6208                  *       we're already using the machine cred for exchange_id
6209                  *       and will never use a different cred.
6210                  */
6211                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6212                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6213                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6214                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6215                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6216                         dfprintk(MOUNT, "  minimal mode enabled\n");
6217                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6218                 } else {
6219                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6220                         return -EINVAL;
6221                 }
6222
6223                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6224                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6225                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6226                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6227                 }
6228
6229                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6230                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6231                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6232                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6233                 }
6234
6235                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6236                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6237                         dfprintk(MOUNT, "  stateid mode enabled\n");
6238                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6239                 }
6240
6241                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6242                         dfprintk(MOUNT, "  write mode enabled\n");
6243                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6244                 }
6245
6246                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6247                         dfprintk(MOUNT, "  commit mode enabled\n");
6248                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6249                 }
6250         }
6251
6252         return 0;
6253 }
6254
6255 /*
6256  * _nfs4_proc_exchange_id()
6257  *
6258  * Wrapper for EXCHANGE_ID operation.
6259  */
6260 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6261         u32 sp4_how)
6262 {
6263         nfs4_verifier verifier;
6264         struct nfs41_exchange_id_args args = {
6265                 .verifier = &verifier,
6266                 .client = clp,
6267                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6268                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
6269         };
6270         struct nfs41_exchange_id_res res = {
6271                 0
6272         };
6273         int status;
6274         struct rpc_message msg = {
6275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6276                 .rpc_argp = &args,
6277                 .rpc_resp = &res,
6278                 .rpc_cred = cred,
6279         };
6280
6281         nfs4_init_boot_verifier(clp, &verifier);
6282         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6283                                                         sizeof(args.id));
6284         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6285                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6286                 args.id_len, args.id);
6287
6288         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6289                                         GFP_NOFS);
6290         if (unlikely(res.server_owner == NULL)) {
6291                 status = -ENOMEM;
6292                 goto out;
6293         }
6294
6295         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6296                                         GFP_NOFS);
6297         if (unlikely(res.server_scope == NULL)) {
6298                 status = -ENOMEM;
6299                 goto out_server_owner;
6300         }
6301
6302         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6303         if (unlikely(res.impl_id == NULL)) {
6304                 status = -ENOMEM;
6305                 goto out_server_scope;
6306         }
6307
6308         switch (sp4_how) {
6309         case SP4_NONE:
6310                 args.state_protect.how = SP4_NONE;
6311                 break;
6312
6313         case SP4_MACH_CRED:
6314                 args.state_protect = nfs4_sp4_mach_cred_request;
6315                 break;
6316
6317         default:
6318                 /* unsupported! */
6319                 WARN_ON_ONCE(1);
6320                 status = -EINVAL;
6321                 goto out_server_scope;
6322         }
6323
6324         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6325         trace_nfs4_exchange_id(clp, status);
6326         if (status == 0)
6327                 status = nfs4_check_cl_exchange_flags(res.flags);
6328
6329         if (status == 0)
6330                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6331
6332         if (status == 0) {
6333                 clp->cl_clientid = res.clientid;
6334                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6335                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6336                         clp->cl_seqid = res.seqid;
6337
6338                 kfree(clp->cl_serverowner);
6339                 clp->cl_serverowner = res.server_owner;
6340                 res.server_owner = NULL;
6341
6342                 /* use the most recent implementation id */
6343                 kfree(clp->cl_implid);
6344                 clp->cl_implid = res.impl_id;
6345
6346                 if (clp->cl_serverscope != NULL &&
6347                     !nfs41_same_server_scope(clp->cl_serverscope,
6348                                              res.server_scope)) {
6349                         dprintk("%s: server_scope mismatch detected\n",
6350                                 __func__);
6351                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6352                         kfree(clp->cl_serverscope);
6353                         clp->cl_serverscope = NULL;
6354                 }
6355
6356                 if (clp->cl_serverscope == NULL) {
6357                         clp->cl_serverscope = res.server_scope;
6358                         goto out;
6359                 }
6360         } else
6361                 kfree(res.impl_id);
6362
6363 out_server_owner:
6364         kfree(res.server_owner);
6365 out_server_scope:
6366         kfree(res.server_scope);
6367 out:
6368         if (clp->cl_implid != NULL)
6369                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6370                         "domain: %s, name: %s, date: %llu,%u\n",
6371                         clp->cl_implid->domain, clp->cl_implid->name,
6372                         clp->cl_implid->date.seconds,
6373                         clp->cl_implid->date.nseconds);
6374         dprintk("NFS reply exchange_id: %d\n", status);
6375         return status;
6376 }
6377
6378 /*
6379  * nfs4_proc_exchange_id()
6380  *
6381  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6382  *
6383  * Since the clientid has expired, all compounds using sessions
6384  * associated with the stale clientid will be returning
6385  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6386  * be in some phase of session reset.
6387  *
6388  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6389  */
6390 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6391 {
6392         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6393         int status;
6394
6395         /* try SP4_MACH_CRED if krb5i/p */
6396         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6397             authflavor == RPC_AUTH_GSS_KRB5P) {
6398                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6399                 if (!status)
6400                         return 0;
6401         }
6402
6403         /* try SP4_NONE */
6404         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6405 }
6406
6407 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6408                 struct rpc_cred *cred)
6409 {
6410         struct rpc_message msg = {
6411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6412                 .rpc_argp = clp,
6413                 .rpc_cred = cred,
6414         };
6415         int status;
6416
6417         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6418         trace_nfs4_destroy_clientid(clp, status);
6419         if (status)
6420                 dprintk("NFS: Got error %d from the server %s on "
6421                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6422         return status;
6423 }
6424
6425 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6426                 struct rpc_cred *cred)
6427 {
6428         unsigned int loop;
6429         int ret;
6430
6431         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6432                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6433                 switch (ret) {
6434                 case -NFS4ERR_DELAY:
6435                 case -NFS4ERR_CLIENTID_BUSY:
6436                         ssleep(1);
6437                         break;
6438                 default:
6439                         return ret;
6440                 }
6441         }
6442         return 0;
6443 }
6444
6445 int nfs4_destroy_clientid(struct nfs_client *clp)
6446 {
6447         struct rpc_cred *cred;
6448         int ret = 0;
6449
6450         if (clp->cl_mvops->minor_version < 1)
6451                 goto out;
6452         if (clp->cl_exchange_flags == 0)
6453                 goto out;
6454         if (clp->cl_preserve_clid)
6455                 goto out;
6456         cred = nfs4_get_clid_cred(clp);
6457         ret = nfs4_proc_destroy_clientid(clp, cred);
6458         if (cred)
6459                 put_rpccred(cred);
6460         switch (ret) {
6461         case 0:
6462         case -NFS4ERR_STALE_CLIENTID:
6463                 clp->cl_exchange_flags = 0;
6464         }
6465 out:
6466         return ret;
6467 }
6468
6469 struct nfs4_get_lease_time_data {
6470         struct nfs4_get_lease_time_args *args;
6471         struct nfs4_get_lease_time_res *res;
6472         struct nfs_client *clp;
6473 };
6474
6475 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6476                                         void *calldata)
6477 {
6478         struct nfs4_get_lease_time_data *data =
6479                         (struct nfs4_get_lease_time_data *)calldata;
6480
6481         dprintk("--> %s\n", __func__);
6482         /* just setup sequence, do not trigger session recovery
6483            since we're invoked within one */
6484         nfs41_setup_sequence(data->clp->cl_session,
6485                         &data->args->la_seq_args,
6486                         &data->res->lr_seq_res,
6487                         task);
6488         dprintk("<-- %s\n", __func__);
6489 }
6490
6491 /*
6492  * Called from nfs4_state_manager thread for session setup, so don't recover
6493  * from sequence operation or clientid errors.
6494  */
6495 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6496 {
6497         struct nfs4_get_lease_time_data *data =
6498                         (struct nfs4_get_lease_time_data *)calldata;
6499
6500         dprintk("--> %s\n", __func__);
6501         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6502                 return;
6503         switch (task->tk_status) {
6504         case -NFS4ERR_DELAY:
6505         case -NFS4ERR_GRACE:
6506                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6507                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6508                 task->tk_status = 0;
6509                 /* fall through */
6510         case -NFS4ERR_RETRY_UNCACHED_REP:
6511                 rpc_restart_call_prepare(task);
6512                 return;
6513         }
6514         dprintk("<-- %s\n", __func__);
6515 }
6516
6517 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6518         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6519         .rpc_call_done = nfs4_get_lease_time_done,
6520 };
6521
6522 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6523 {
6524         struct rpc_task *task;
6525         struct nfs4_get_lease_time_args args;
6526         struct nfs4_get_lease_time_res res = {
6527                 .lr_fsinfo = fsinfo,
6528         };
6529         struct nfs4_get_lease_time_data data = {
6530                 .args = &args,
6531                 .res = &res,
6532                 .clp = clp,
6533         };
6534         struct rpc_message msg = {
6535                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6536                 .rpc_argp = &args,
6537                 .rpc_resp = &res,
6538         };
6539         struct rpc_task_setup task_setup = {
6540                 .rpc_client = clp->cl_rpcclient,
6541                 .rpc_message = &msg,
6542                 .callback_ops = &nfs4_get_lease_time_ops,
6543                 .callback_data = &data,
6544                 .flags = RPC_TASK_TIMEOUT,
6545         };
6546         int status;
6547
6548         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6549         nfs4_set_sequence_privileged(&args.la_seq_args);
6550         dprintk("--> %s\n", __func__);
6551         task = rpc_run_task(&task_setup);
6552
6553         if (IS_ERR(task))
6554                 status = PTR_ERR(task);
6555         else {
6556                 status = task->tk_status;
6557                 rpc_put_task(task);
6558         }
6559         dprintk("<-- %s return %d\n", __func__, status);
6560
6561         return status;
6562 }
6563
6564 /*
6565  * Initialize the values to be used by the client in CREATE_SESSION
6566  * If nfs4_init_session set the fore channel request and response sizes,
6567  * use them.
6568  *
6569  * Set the back channel max_resp_sz_cached to zero to force the client to
6570  * always set csa_cachethis to FALSE because the current implementation
6571  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6572  */
6573 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6574 {
6575         unsigned int max_rqst_sz, max_resp_sz;
6576
6577         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6578         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6579
6580         /* Fore channel attributes */
6581         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6582         args->fc_attrs.max_resp_sz = max_resp_sz;
6583         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6584         args->fc_attrs.max_reqs = max_session_slots;
6585
6586         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6587                 "max_ops=%u max_reqs=%u\n",
6588                 __func__,
6589                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6590                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6591
6592         /* Back channel attributes */
6593         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6594         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6595         args->bc_attrs.max_resp_sz_cached = 0;
6596         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6597         args->bc_attrs.max_reqs = 1;
6598
6599         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6600                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6601                 __func__,
6602                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6603                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6604                 args->bc_attrs.max_reqs);
6605 }
6606
6607 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6608 {
6609         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6610         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6611
6612         if (rcvd->max_resp_sz > sent->max_resp_sz)
6613                 return -EINVAL;
6614         /*
6615          * Our requested max_ops is the minimum we need; we're not
6616          * prepared to break up compounds into smaller pieces than that.
6617          * So, no point even trying to continue if the server won't
6618          * cooperate:
6619          */
6620         if (rcvd->max_ops < sent->max_ops)
6621                 return -EINVAL;
6622         if (rcvd->max_reqs == 0)
6623                 return -EINVAL;
6624         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6625                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6626         return 0;
6627 }
6628
6629 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6630 {
6631         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6632         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6633
6634         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6635                 return -EINVAL;
6636         if (rcvd->max_resp_sz < sent->max_resp_sz)
6637                 return -EINVAL;
6638         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6639                 return -EINVAL;
6640         /* These would render the backchannel useless: */
6641         if (rcvd->max_ops != sent->max_ops)
6642                 return -EINVAL;
6643         if (rcvd->max_reqs != sent->max_reqs)
6644                 return -EINVAL;
6645         return 0;
6646 }
6647
6648 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6649                                      struct nfs4_session *session)
6650 {
6651         int ret;
6652
6653         ret = nfs4_verify_fore_channel_attrs(args, session);
6654         if (ret)
6655                 return ret;
6656         return nfs4_verify_back_channel_attrs(args, session);
6657 }
6658
6659 static int _nfs4_proc_create_session(struct nfs_client *clp,
6660                 struct rpc_cred *cred)
6661 {
6662         struct nfs4_session *session = clp->cl_session;
6663         struct nfs41_create_session_args args = {
6664                 .client = clp,
6665                 .cb_program = NFS4_CALLBACK,
6666         };
6667         struct nfs41_create_session_res res = {
6668                 .client = clp,
6669         };
6670         struct rpc_message msg = {
6671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6672                 .rpc_argp = &args,
6673                 .rpc_resp = &res,
6674                 .rpc_cred = cred,
6675         };
6676         int status;
6677
6678         nfs4_init_channel_attrs(&args);
6679         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6680
6681         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6682         trace_nfs4_create_session(clp, status);
6683
6684         if (!status) {
6685                 /* Verify the session's negotiated channel_attrs values */
6686                 status = nfs4_verify_channel_attrs(&args, session);
6687                 /* Increment the clientid slot sequence id */
6688                 clp->cl_seqid++;
6689         }
6690
6691         return status;
6692 }
6693
6694 /*
6695  * Issues a CREATE_SESSION operation to the server.
6696  * It is the responsibility of the caller to verify the session is
6697  * expired before calling this routine.
6698  */
6699 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6700 {
6701         int status;
6702         unsigned *ptr;
6703         struct nfs4_session *session = clp->cl_session;
6704
6705         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6706
6707         status = _nfs4_proc_create_session(clp, cred);
6708         if (status)
6709                 goto out;
6710
6711         /* Init or reset the session slot tables */
6712         status = nfs4_setup_session_slot_tables(session);
6713         dprintk("slot table setup returned %d\n", status);
6714         if (status)
6715                 goto out;
6716
6717         ptr = (unsigned *)&session->sess_id.data[0];
6718         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6719                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6720 out:
6721         dprintk("<-- %s\n", __func__);
6722         return status;
6723 }
6724
6725 /*
6726  * Issue the over-the-wire RPC DESTROY_SESSION.
6727  * The caller must serialize access to this routine.
6728  */
6729 int nfs4_proc_destroy_session(struct nfs4_session *session,
6730                 struct rpc_cred *cred)
6731 {
6732         struct rpc_message msg = {
6733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6734                 .rpc_argp = session,
6735                 .rpc_cred = cred,
6736         };
6737         int status = 0;
6738
6739         dprintk("--> nfs4_proc_destroy_session\n");
6740
6741         /* session is still being setup */
6742         if (session->clp->cl_cons_state != NFS_CS_READY)
6743                 return status;
6744
6745         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6746         trace_nfs4_destroy_session(session->clp, status);
6747
6748         if (status)
6749                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6750                         "Session has been destroyed regardless...\n", status);
6751
6752         dprintk("<-- nfs4_proc_destroy_session\n");
6753         return status;
6754 }
6755
6756 /*
6757  * Renew the cl_session lease.
6758  */
6759 struct nfs4_sequence_data {
6760         struct nfs_client *clp;
6761         struct nfs4_sequence_args args;
6762         struct nfs4_sequence_res res;
6763 };
6764
6765 static void nfs41_sequence_release(void *data)
6766 {
6767         struct nfs4_sequence_data *calldata = data;
6768         struct nfs_client *clp = calldata->clp;
6769
6770         if (atomic_read(&clp->cl_count) > 1)
6771                 nfs4_schedule_state_renewal(clp);
6772         nfs_put_client(clp);
6773         kfree(calldata);
6774 }
6775
6776 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6777 {
6778         switch(task->tk_status) {
6779         case -NFS4ERR_DELAY:
6780                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6781                 return -EAGAIN;
6782         default:
6783                 nfs4_schedule_lease_recovery(clp);
6784         }
6785         return 0;
6786 }
6787
6788 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6789 {
6790         struct nfs4_sequence_data *calldata = data;
6791         struct nfs_client *clp = calldata->clp;
6792
6793         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6794                 return;
6795
6796         trace_nfs4_sequence(clp, task->tk_status);
6797         if (task->tk_status < 0) {
6798                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6799                 if (atomic_read(&clp->cl_count) == 1)
6800                         goto out;
6801
6802                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6803                         rpc_restart_call_prepare(task);
6804                         return;
6805                 }
6806         }
6807         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6808 out:
6809         dprintk("<-- %s\n", __func__);
6810 }
6811
6812 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6813 {
6814         struct nfs4_sequence_data *calldata = data;
6815         struct nfs_client *clp = calldata->clp;
6816         struct nfs4_sequence_args *args;
6817         struct nfs4_sequence_res *res;
6818
6819         args = task->tk_msg.rpc_argp;
6820         res = task->tk_msg.rpc_resp;
6821
6822         nfs41_setup_sequence(clp->cl_session, args, res, task);
6823 }
6824
6825 static const struct rpc_call_ops nfs41_sequence_ops = {
6826         .rpc_call_done = nfs41_sequence_call_done,
6827         .rpc_call_prepare = nfs41_sequence_prepare,
6828         .rpc_release = nfs41_sequence_release,
6829 };
6830
6831 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6832                 struct rpc_cred *cred,
6833                 bool is_privileged)
6834 {
6835         struct nfs4_sequence_data *calldata;
6836         struct rpc_message msg = {
6837                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6838                 .rpc_cred = cred,
6839         };
6840         struct rpc_task_setup task_setup_data = {
6841                 .rpc_client = clp->cl_rpcclient,
6842                 .rpc_message = &msg,
6843                 .callback_ops = &nfs41_sequence_ops,
6844                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6845         };
6846
6847         if (!atomic_inc_not_zero(&clp->cl_count))
6848                 return ERR_PTR(-EIO);
6849         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6850         if (calldata == NULL) {
6851                 nfs_put_client(clp);
6852                 return ERR_PTR(-ENOMEM);
6853         }
6854         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
6855         if (is_privileged)
6856                 nfs4_set_sequence_privileged(&calldata->args);
6857         msg.rpc_argp = &calldata->args;
6858         msg.rpc_resp = &calldata->res;
6859         calldata->clp = clp;
6860         task_setup_data.callback_data = calldata;
6861
6862         return rpc_run_task(&task_setup_data);
6863 }
6864
6865 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6866 {
6867         struct rpc_task *task;
6868         int ret = 0;
6869
6870         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6871                 return 0;
6872         task = _nfs41_proc_sequence(clp, cred, false);
6873         if (IS_ERR(task))
6874                 ret = PTR_ERR(task);
6875         else
6876                 rpc_put_task_async(task);
6877         dprintk("<-- %s status=%d\n", __func__, ret);
6878         return ret;
6879 }
6880
6881 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6882 {
6883         struct rpc_task *task;
6884         int ret;
6885
6886         task = _nfs41_proc_sequence(clp, cred, true);
6887         if (IS_ERR(task)) {
6888                 ret = PTR_ERR(task);
6889                 goto out;
6890         }
6891         ret = rpc_wait_for_completion_task(task);
6892         if (!ret) {
6893                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6894
6895                 if (task->tk_status == 0)
6896                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6897                 ret = task->tk_status;
6898         }
6899         rpc_put_task(task);
6900 out:
6901         dprintk("<-- %s status=%d\n", __func__, ret);
6902         return ret;
6903 }
6904
6905 struct nfs4_reclaim_complete_data {
6906         struct nfs_client *clp;
6907         struct nfs41_reclaim_complete_args arg;
6908         struct nfs41_reclaim_complete_res res;
6909 };
6910
6911 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6912 {
6913         struct nfs4_reclaim_complete_data *calldata = data;
6914
6915         nfs41_setup_sequence(calldata->clp->cl_session,
6916                         &calldata->arg.seq_args,
6917                         &calldata->res.seq_res,
6918                         task);
6919 }
6920
6921 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6922 {
6923         switch(task->tk_status) {
6924         case 0:
6925         case -NFS4ERR_COMPLETE_ALREADY:
6926         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6927                 break;
6928         case -NFS4ERR_DELAY:
6929                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6930                 /* fall through */
6931         case -NFS4ERR_RETRY_UNCACHED_REP:
6932                 return -EAGAIN;
6933         default:
6934                 nfs4_schedule_lease_recovery(clp);
6935         }
6936         return 0;
6937 }
6938
6939 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6940 {
6941         struct nfs4_reclaim_complete_data *calldata = data;
6942         struct nfs_client *clp = calldata->clp;
6943         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6944
6945         dprintk("--> %s\n", __func__);
6946         if (!nfs41_sequence_done(task, res))
6947                 return;
6948
6949         trace_nfs4_reclaim_complete(clp, task->tk_status);
6950         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6951                 rpc_restart_call_prepare(task);
6952                 return;
6953         }
6954         dprintk("<-- %s\n", __func__);
6955 }
6956
6957 static void nfs4_free_reclaim_complete_data(void *data)
6958 {
6959         struct nfs4_reclaim_complete_data *calldata = data;
6960
6961         kfree(calldata);
6962 }
6963
6964 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6965         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6966         .rpc_call_done = nfs4_reclaim_complete_done,
6967         .rpc_release = nfs4_free_reclaim_complete_data,
6968 };
6969
6970 /*
6971  * Issue a global reclaim complete.
6972  */
6973 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6974                 struct rpc_cred *cred)
6975 {
6976         struct nfs4_reclaim_complete_data *calldata;
6977         struct rpc_task *task;
6978         struct rpc_message msg = {
6979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6980                 .rpc_cred = cred,
6981         };
6982         struct rpc_task_setup task_setup_data = {
6983                 .rpc_client = clp->cl_rpcclient,
6984                 .rpc_message = &msg,
6985                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6986                 .flags = RPC_TASK_ASYNC,
6987         };
6988         int status = -ENOMEM;
6989
6990         dprintk("--> %s\n", __func__);
6991         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6992         if (calldata == NULL)
6993                 goto out;
6994         calldata->clp = clp;
6995         calldata->arg.one_fs = 0;
6996
6997         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6998         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6999         msg.rpc_argp = &calldata->arg;
7000         msg.rpc_resp = &calldata->res;
7001         task_setup_data.callback_data = calldata;
7002         task = rpc_run_task(&task_setup_data);
7003         if (IS_ERR(task)) {
7004                 status = PTR_ERR(task);
7005                 goto out;
7006         }
7007         status = nfs4_wait_for_completion_rpc_task(task);
7008         if (status == 0)
7009                 status = task->tk_status;
7010         rpc_put_task(task);
7011         return 0;
7012 out:
7013         dprintk("<-- %s status=%d\n", __func__, status);
7014         return status;
7015 }
7016
7017 static void
7018 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7019 {
7020         struct nfs4_layoutget *lgp = calldata;
7021         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7022         struct nfs4_session *session = nfs4_get_session(server);
7023
7024         dprintk("--> %s\n", __func__);
7025         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7026          * right now covering the LAYOUTGET we are about to send.
7027          * However, that is not so catastrophic, and there seems
7028          * to be no way to prevent it completely.
7029          */
7030         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7031                                 &lgp->res.seq_res, task))
7032                 return;
7033         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7034                                           NFS_I(lgp->args.inode)->layout,
7035                                           lgp->args.ctx->state)) {
7036                 rpc_exit(task, NFS4_OK);
7037         }
7038 }
7039
7040 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7041 {
7042         struct nfs4_layoutget *lgp = calldata;
7043         struct inode *inode = lgp->args.inode;
7044         struct nfs_server *server = NFS_SERVER(inode);
7045         struct pnfs_layout_hdr *lo;
7046         struct nfs4_state *state = NULL;
7047         unsigned long timeo, giveup;
7048
7049         dprintk("--> %s\n", __func__);
7050
7051         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7052                 goto out;
7053
7054         switch (task->tk_status) {
7055         case 0:
7056                 goto out;
7057         case -NFS4ERR_LAYOUTTRYLATER:
7058         case -NFS4ERR_RECALLCONFLICT:
7059                 timeo = rpc_get_timeout(task->tk_client);
7060                 giveup = lgp->args.timestamp + timeo;
7061                 if (time_after(giveup, jiffies))
7062                         task->tk_status = -NFS4ERR_DELAY;
7063                 break;
7064         case -NFS4ERR_EXPIRED:
7065         case -NFS4ERR_BAD_STATEID:
7066                 spin_lock(&inode->i_lock);
7067                 lo = NFS_I(inode)->layout;
7068                 if (!lo || list_empty(&lo->plh_segs)) {
7069                         spin_unlock(&inode->i_lock);
7070                         /* If the open stateid was bad, then recover it. */
7071                         state = lgp->args.ctx->state;
7072                 } else {
7073                         LIST_HEAD(head);
7074
7075                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7076                         spin_unlock(&inode->i_lock);
7077                         /* Mark the bad layout state as invalid, then
7078                          * retry using the open stateid. */
7079                         pnfs_free_lseg_list(&head);
7080                 }
7081         }
7082         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7083                 rpc_restart_call_prepare(task);
7084 out:
7085         dprintk("<-- %s\n", __func__);
7086 }
7087
7088 static size_t max_response_pages(struct nfs_server *server)
7089 {
7090         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7091         return nfs_page_array_len(0, max_resp_sz);
7092 }
7093
7094 static void nfs4_free_pages(struct page **pages, size_t size)
7095 {
7096         int i;
7097
7098         if (!pages)
7099                 return;
7100
7101         for (i = 0; i < size; i++) {
7102                 if (!pages[i])
7103                         break;
7104                 __free_page(pages[i]);
7105         }
7106         kfree(pages);
7107 }
7108
7109 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7110 {
7111         struct page **pages;
7112         int i;
7113
7114         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7115         if (!pages) {
7116                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7117                 return NULL;
7118         }
7119
7120         for (i = 0; i < size; i++) {
7121                 pages[i] = alloc_page(gfp_flags);
7122                 if (!pages[i]) {
7123                         dprintk("%s: failed to allocate page\n", __func__);
7124                         nfs4_free_pages(pages, size);
7125                         return NULL;
7126                 }
7127         }
7128
7129         return pages;
7130 }
7131
7132 static void nfs4_layoutget_release(void *calldata)
7133 {
7134         struct nfs4_layoutget *lgp = calldata;
7135         struct inode *inode = lgp->args.inode;
7136         struct nfs_server *server = NFS_SERVER(inode);
7137         size_t max_pages = max_response_pages(server);
7138
7139         dprintk("--> %s\n", __func__);
7140         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7141         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7142         put_nfs_open_context(lgp->args.ctx);
7143         kfree(calldata);
7144         dprintk("<-- %s\n", __func__);
7145 }
7146
7147 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7148         .rpc_call_prepare = nfs4_layoutget_prepare,
7149         .rpc_call_done = nfs4_layoutget_done,
7150         .rpc_release = nfs4_layoutget_release,
7151 };
7152
7153 struct pnfs_layout_segment *
7154 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7155 {
7156         struct inode *inode = lgp->args.inode;
7157         struct nfs_server *server = NFS_SERVER(inode);
7158         size_t max_pages = max_response_pages(server);
7159         struct rpc_task *task;
7160         struct rpc_message msg = {
7161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7162                 .rpc_argp = &lgp->args,
7163                 .rpc_resp = &lgp->res,
7164                 .rpc_cred = lgp->cred,
7165         };
7166         struct rpc_task_setup task_setup_data = {
7167                 .rpc_client = server->client,
7168                 .rpc_message = &msg,
7169                 .callback_ops = &nfs4_layoutget_call_ops,
7170                 .callback_data = lgp,
7171                 .flags = RPC_TASK_ASYNC,
7172         };
7173         struct pnfs_layout_segment *lseg = NULL;
7174         int status = 0;
7175
7176         dprintk("--> %s\n", __func__);
7177
7178         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7179         if (!lgp->args.layout.pages) {
7180                 nfs4_layoutget_release(lgp);
7181                 return ERR_PTR(-ENOMEM);
7182         }
7183         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7184         lgp->args.timestamp = jiffies;
7185
7186         lgp->res.layoutp = &lgp->args.layout;
7187         lgp->res.seq_res.sr_slot = NULL;
7188         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7189
7190         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7191         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7192
7193         task = rpc_run_task(&task_setup_data);
7194         if (IS_ERR(task))
7195                 return ERR_CAST(task);
7196         status = nfs4_wait_for_completion_rpc_task(task);
7197         if (status == 0)
7198                 status = task->tk_status;
7199         trace_nfs4_layoutget(lgp->args.ctx,
7200                         &lgp->args.range,
7201                         &lgp->res.range,
7202                         status);
7203         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7204         if (status == 0 && lgp->res.layoutp->len)
7205                 lseg = pnfs_layout_process(lgp);
7206         rpc_put_task(task);
7207         dprintk("<-- %s status=%d\n", __func__, status);
7208         if (status)
7209                 return ERR_PTR(status);
7210         return lseg;
7211 }
7212
7213 static void
7214 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7215 {
7216         struct nfs4_layoutreturn *lrp = calldata;
7217
7218         dprintk("--> %s\n", __func__);
7219         nfs41_setup_sequence(lrp->clp->cl_session,
7220                         &lrp->args.seq_args,
7221                         &lrp->res.seq_res,
7222                         task);
7223 }
7224
7225 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7226 {
7227         struct nfs4_layoutreturn *lrp = calldata;
7228         struct nfs_server *server;
7229
7230         dprintk("--> %s\n", __func__);
7231
7232         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7233                 return;
7234
7235         server = NFS_SERVER(lrp->args.inode);
7236         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7237                 rpc_restart_call_prepare(task);
7238                 return;
7239         }
7240         dprintk("<-- %s\n", __func__);
7241 }
7242
7243 static void nfs4_layoutreturn_release(void *calldata)
7244 {
7245         struct nfs4_layoutreturn *lrp = calldata;
7246         struct pnfs_layout_hdr *lo = lrp->args.layout;
7247
7248         dprintk("--> %s\n", __func__);
7249         spin_lock(&lo->plh_inode->i_lock);
7250         if (lrp->res.lrs_present)
7251                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7252         lo->plh_block_lgets--;
7253         spin_unlock(&lo->plh_inode->i_lock);
7254         pnfs_put_layout_hdr(lrp->args.layout);
7255         kfree(calldata);
7256         dprintk("<-- %s\n", __func__);
7257 }
7258
7259 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7260         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7261         .rpc_call_done = nfs4_layoutreturn_done,
7262         .rpc_release = nfs4_layoutreturn_release,
7263 };
7264
7265 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7266 {
7267         struct rpc_task *task;
7268         struct rpc_message msg = {
7269                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7270                 .rpc_argp = &lrp->args,
7271                 .rpc_resp = &lrp->res,
7272                 .rpc_cred = lrp->cred,
7273         };
7274         struct rpc_task_setup task_setup_data = {
7275                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7276                 .rpc_message = &msg,
7277                 .callback_ops = &nfs4_layoutreturn_call_ops,
7278                 .callback_data = lrp,
7279         };
7280         int status;
7281
7282         dprintk("--> %s\n", __func__);
7283         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7284         task = rpc_run_task(&task_setup_data);
7285         if (IS_ERR(task))
7286                 return PTR_ERR(task);
7287         status = task->tk_status;
7288         trace_nfs4_layoutreturn(lrp->args.inode, status);
7289         dprintk("<-- %s status=%d\n", __func__, status);
7290         rpc_put_task(task);
7291         return status;
7292 }
7293
7294 /*
7295  * Retrieve the list of Data Server devices from the MDS.
7296  */
7297 static int _nfs4_getdevicelist(struct nfs_server *server,
7298                                     const struct nfs_fh *fh,
7299                                     struct pnfs_devicelist *devlist)
7300 {
7301         struct nfs4_getdevicelist_args args = {
7302                 .fh = fh,
7303                 .layoutclass = server->pnfs_curr_ld->id,
7304         };
7305         struct nfs4_getdevicelist_res res = {
7306                 .devlist = devlist,
7307         };
7308         struct rpc_message msg = {
7309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7310                 .rpc_argp = &args,
7311                 .rpc_resp = &res,
7312         };
7313         int status;
7314
7315         dprintk("--> %s\n", __func__);
7316         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7317                                 &res.seq_res, 0);
7318         dprintk("<-- %s status=%d\n", __func__, status);
7319         return status;
7320 }
7321
7322 int nfs4_proc_getdevicelist(struct nfs_server *server,
7323                             const struct nfs_fh *fh,
7324                             struct pnfs_devicelist *devlist)
7325 {
7326         struct nfs4_exception exception = { };
7327         int err;
7328
7329         do {
7330                 err = nfs4_handle_exception(server,
7331                                 _nfs4_getdevicelist(server, fh, devlist),
7332                                 &exception);
7333         } while (exception.retry);
7334
7335         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7336                 err, devlist->num_devs);
7337
7338         return err;
7339 }
7340 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7341
7342 static int
7343 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7344                 struct pnfs_device *pdev,
7345                 struct rpc_cred *cred)
7346 {
7347         struct nfs4_getdeviceinfo_args args = {
7348                 .pdev = pdev,
7349         };
7350         struct nfs4_getdeviceinfo_res res = {
7351                 .pdev = pdev,
7352         };
7353         struct rpc_message msg = {
7354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7355                 .rpc_argp = &args,
7356                 .rpc_resp = &res,
7357                 .rpc_cred = cred,
7358         };
7359         int status;
7360
7361         dprintk("--> %s\n", __func__);
7362         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7363         dprintk("<-- %s status=%d\n", __func__, status);
7364
7365         return status;
7366 }
7367
7368 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7369                 struct pnfs_device *pdev,
7370                 struct rpc_cred *cred)
7371 {
7372         struct nfs4_exception exception = { };
7373         int err;
7374
7375         do {
7376                 err = nfs4_handle_exception(server,
7377                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7378                                         &exception);
7379         } while (exception.retry);
7380         return err;
7381 }
7382 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7383
7384 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7385 {
7386         struct nfs4_layoutcommit_data *data = calldata;
7387         struct nfs_server *server = NFS_SERVER(data->args.inode);
7388         struct nfs4_session *session = nfs4_get_session(server);
7389
7390         nfs41_setup_sequence(session,
7391                         &data->args.seq_args,
7392                         &data->res.seq_res,
7393                         task);
7394 }
7395
7396 static void
7397 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7398 {
7399         struct nfs4_layoutcommit_data *data = calldata;
7400         struct nfs_server *server = NFS_SERVER(data->args.inode);
7401
7402         if (!nfs41_sequence_done(task, &data->res.seq_res))
7403                 return;
7404
7405         switch (task->tk_status) { /* Just ignore these failures */
7406         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7407         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7408         case -NFS4ERR_BADLAYOUT:     /* no layout */
7409         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7410                 task->tk_status = 0;
7411                 break;
7412         case 0:
7413                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7414                                                    data->res.fattr);
7415                 break;
7416         default:
7417                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7418                         rpc_restart_call_prepare(task);
7419                         return;
7420                 }
7421         }
7422 }
7423
7424 static void nfs4_layoutcommit_release(void *calldata)
7425 {
7426         struct nfs4_layoutcommit_data *data = calldata;
7427
7428         pnfs_cleanup_layoutcommit(data);
7429         put_rpccred(data->cred);
7430         kfree(data);
7431 }
7432
7433 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7434         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7435         .rpc_call_done = nfs4_layoutcommit_done,
7436         .rpc_release = nfs4_layoutcommit_release,
7437 };
7438
7439 int
7440 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7441 {
7442         struct rpc_message msg = {
7443                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7444                 .rpc_argp = &data->args,
7445                 .rpc_resp = &data->res,
7446                 .rpc_cred = data->cred,
7447         };
7448         struct rpc_task_setup task_setup_data = {
7449                 .task = &data->task,
7450                 .rpc_client = NFS_CLIENT(data->args.inode),
7451                 .rpc_message = &msg,
7452                 .callback_ops = &nfs4_layoutcommit_ops,
7453                 .callback_data = data,
7454                 .flags = RPC_TASK_ASYNC,
7455         };
7456         struct rpc_task *task;
7457         int status = 0;
7458
7459         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7460                 "lbw: %llu inode %lu\n",
7461                 data->task.tk_pid, sync,
7462                 data->args.lastbytewritten,
7463                 data->args.inode->i_ino);
7464
7465         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7466         task = rpc_run_task(&task_setup_data);
7467         if (IS_ERR(task))
7468                 return PTR_ERR(task);
7469         if (sync == false)
7470                 goto out;
7471         status = nfs4_wait_for_completion_rpc_task(task);
7472         if (status != 0)
7473                 goto out;
7474         status = task->tk_status;
7475         trace_nfs4_layoutcommit(data->args.inode, status);
7476 out:
7477         dprintk("%s: status %d\n", __func__, status);
7478         rpc_put_task(task);
7479         return status;
7480 }
7481
7482 /**
7483  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7484  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7485  */
7486 static int
7487 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7488                     struct nfs_fsinfo *info,
7489                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7490 {
7491         struct nfs41_secinfo_no_name_args args = {
7492                 .style = SECINFO_STYLE_CURRENT_FH,
7493         };
7494         struct nfs4_secinfo_res res = {
7495                 .flavors = flavors,
7496         };
7497         struct rpc_message msg = {
7498                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7499                 .rpc_argp = &args,
7500                 .rpc_resp = &res,
7501         };
7502         struct rpc_clnt *clnt = server->client;
7503         struct rpc_cred *cred = NULL;
7504         int status;
7505
7506         if (use_integrity) {
7507                 clnt = server->nfs_client->cl_rpcclient;
7508                 cred = nfs4_get_clid_cred(server->nfs_client);
7509                 msg.rpc_cred = cred;
7510         }
7511
7512         dprintk("--> %s\n", __func__);
7513         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7514                                 &res.seq_res, 0);
7515         dprintk("<-- %s status=%d\n", __func__, status);
7516
7517         if (cred)
7518                 put_rpccred(cred);
7519
7520         return status;
7521 }
7522
7523 static int
7524 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7525                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7526 {
7527         struct nfs4_exception exception = { };
7528         int err;
7529         do {
7530                 /* first try using integrity protection */
7531                 err = -NFS4ERR_WRONGSEC;
7532
7533                 /* try to use integrity protection with machine cred */
7534                 if (_nfs4_is_integrity_protected(server->nfs_client))
7535                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7536                                                           flavors, true);
7537
7538                 /*
7539                  * if unable to use integrity protection, or SECINFO with
7540                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7541                  * disallowed by spec, but exists in deployed servers) use
7542                  * the current filesystem's rpc_client and the user cred.
7543                  */
7544                 if (err == -NFS4ERR_WRONGSEC)
7545                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7546                                                           flavors, false);
7547
7548                 switch (err) {
7549                 case 0:
7550                 case -NFS4ERR_WRONGSEC:
7551                 case -NFS4ERR_NOTSUPP:
7552                         goto out;
7553                 default:
7554                         err = nfs4_handle_exception(server, err, &exception);
7555                 }
7556         } while (exception.retry);
7557 out:
7558         return err;
7559 }
7560
7561 static int
7562 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7563                     struct nfs_fsinfo *info)
7564 {
7565         int err;
7566         struct page *page;
7567         rpc_authflavor_t flavor;
7568         struct nfs4_secinfo_flavors *flavors;
7569
7570         page = alloc_page(GFP_KERNEL);
7571         if (!page) {
7572                 err = -ENOMEM;
7573                 goto out;
7574         }
7575
7576         flavors = page_address(page);
7577         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7578
7579         /*
7580          * Fall back on "guess and check" method if
7581          * the server doesn't support SECINFO_NO_NAME
7582          */
7583         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7584                 err = nfs4_find_root_sec(server, fhandle, info);
7585                 goto out_freepage;
7586         }
7587         if (err)
7588                 goto out_freepage;
7589
7590         flavor = nfs_find_best_sec(flavors);
7591         if (err == 0)
7592                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7593
7594 out_freepage:
7595         put_page(page);
7596         if (err == -EACCES)
7597                 return -EPERM;
7598 out:
7599         return err;
7600 }
7601
7602 static int _nfs41_test_stateid(struct nfs_server *server,
7603                 nfs4_stateid *stateid,
7604                 struct rpc_cred *cred)
7605 {
7606         int status;
7607         struct nfs41_test_stateid_args args = {
7608                 .stateid = stateid,
7609         };
7610         struct nfs41_test_stateid_res res;
7611         struct rpc_message msg = {
7612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7613                 .rpc_argp = &args,
7614                 .rpc_resp = &res,
7615                 .rpc_cred = cred,
7616         };
7617         struct rpc_clnt *rpc_client = server->client;
7618
7619         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7620                 &rpc_client, &msg);
7621
7622         dprintk("NFS call  test_stateid %p\n", stateid);
7623         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7624         nfs4_set_sequence_privileged(&args.seq_args);
7625         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
7626                         &args.seq_args, &res.seq_res);
7627         if (status != NFS_OK) {
7628                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7629                 return status;
7630         }
7631         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7632         return -res.status;
7633 }
7634
7635 /**
7636  * nfs41_test_stateid - perform a TEST_STATEID operation
7637  *
7638  * @server: server / transport on which to perform the operation
7639  * @stateid: state ID to test
7640  * @cred: credential
7641  *
7642  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7643  * Otherwise a negative NFS4ERR value is returned if the operation
7644  * failed or the state ID is not currently valid.
7645  */
7646 static int nfs41_test_stateid(struct nfs_server *server,
7647                 nfs4_stateid *stateid,
7648                 struct rpc_cred *cred)
7649 {
7650         struct nfs4_exception exception = { };
7651         int err;
7652         do {
7653                 err = _nfs41_test_stateid(server, stateid, cred);
7654                 if (err != -NFS4ERR_DELAY)
7655                         break;
7656                 nfs4_handle_exception(server, err, &exception);
7657         } while (exception.retry);
7658         return err;
7659 }
7660
7661 struct nfs_free_stateid_data {
7662         struct nfs_server *server;
7663         struct nfs41_free_stateid_args args;
7664         struct nfs41_free_stateid_res res;
7665 };
7666
7667 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7668 {
7669         struct nfs_free_stateid_data *data = calldata;
7670         nfs41_setup_sequence(nfs4_get_session(data->server),
7671                         &data->args.seq_args,
7672                         &data->res.seq_res,
7673                         task);
7674 }
7675
7676 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7677 {
7678         struct nfs_free_stateid_data *data = calldata;
7679
7680         nfs41_sequence_done(task, &data->res.seq_res);
7681
7682         switch (task->tk_status) {
7683         case -NFS4ERR_DELAY:
7684                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7685                         rpc_restart_call_prepare(task);
7686         }
7687 }
7688
7689 static void nfs41_free_stateid_release(void *calldata)
7690 {
7691         kfree(calldata);
7692 }
7693
7694 static const struct rpc_call_ops nfs41_free_stateid_ops = {
7695         .rpc_call_prepare = nfs41_free_stateid_prepare,
7696         .rpc_call_done = nfs41_free_stateid_done,
7697         .rpc_release = nfs41_free_stateid_release,
7698 };
7699
7700 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7701                 nfs4_stateid *stateid,
7702                 struct rpc_cred *cred,
7703                 bool privileged)
7704 {
7705         struct rpc_message msg = {
7706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7707                 .rpc_cred = cred,
7708         };
7709         struct rpc_task_setup task_setup = {
7710                 .rpc_client = server->client,
7711                 .rpc_message = &msg,
7712                 .callback_ops = &nfs41_free_stateid_ops,
7713                 .flags = RPC_TASK_ASYNC,
7714         };
7715         struct nfs_free_stateid_data *data;
7716
7717         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7718                 &task_setup.rpc_client, &msg);
7719
7720         dprintk("NFS call  free_stateid %p\n", stateid);
7721         data = kmalloc(sizeof(*data), GFP_NOFS);
7722         if (!data)
7723                 return ERR_PTR(-ENOMEM);
7724         data->server = server;
7725         nfs4_stateid_copy(&data->args.stateid, stateid);
7726
7727         task_setup.callback_data = data;
7728
7729         msg.rpc_argp = &data->args;
7730         msg.rpc_resp = &data->res;
7731         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7732         if (privileged)
7733                 nfs4_set_sequence_privileged(&data->args.seq_args);
7734
7735         return rpc_run_task(&task_setup);
7736 }
7737
7738 /**
7739  * nfs41_free_stateid - perform a FREE_STATEID operation
7740  *
7741  * @server: server / transport on which to perform the operation
7742  * @stateid: state ID to release
7743  * @cred: credential
7744  *
7745  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7746  * negative NFS4ERR value is returned.
7747  */
7748 static int nfs41_free_stateid(struct nfs_server *server,
7749                 nfs4_stateid *stateid,
7750                 struct rpc_cred *cred)
7751 {
7752         struct rpc_task *task;
7753         int ret;
7754
7755         task = _nfs41_free_stateid(server, stateid, cred, true);
7756         if (IS_ERR(task))
7757                 return PTR_ERR(task);
7758         ret = rpc_wait_for_completion_task(task);
7759         if (!ret)
7760                 ret = task->tk_status;
7761         rpc_put_task(task);
7762         return ret;
7763 }
7764
7765 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7766 {
7767         struct rpc_task *task;
7768         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7769
7770         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7771         nfs4_free_lock_state(server, lsp);
7772         if (IS_ERR(task))
7773                 return PTR_ERR(task);
7774         rpc_put_task(task);
7775         return 0;
7776 }
7777
7778 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7779                 const nfs4_stateid *s2)
7780 {
7781         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7782                 return false;
7783
7784         if (s1->seqid == s2->seqid)
7785                 return true;
7786         if (s1->seqid == 0 || s2->seqid == 0)
7787                 return true;
7788
7789         return false;
7790 }
7791
7792 #endif /* CONFIG_NFS_V4_1 */
7793
7794 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7795                 const nfs4_stateid *s2)
7796 {
7797         return nfs4_stateid_match(s1, s2);
7798 }
7799
7800
7801 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7802         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7803         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7804         .recover_open   = nfs4_open_reclaim,
7805         .recover_lock   = nfs4_lock_reclaim,
7806         .establish_clid = nfs4_init_clientid,
7807         .detect_trunking = nfs40_discover_server_trunking,
7808 };
7809
7810 #if defined(CONFIG_NFS_V4_1)
7811 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7812         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7813         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7814         .recover_open   = nfs4_open_reclaim,
7815         .recover_lock   = nfs4_lock_reclaim,
7816         .establish_clid = nfs41_init_clientid,
7817         .reclaim_complete = nfs41_proc_reclaim_complete,
7818         .detect_trunking = nfs41_discover_server_trunking,
7819 };
7820 #endif /* CONFIG_NFS_V4_1 */
7821
7822 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7823         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7824         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7825         .recover_open   = nfs4_open_expired,
7826         .recover_lock   = nfs4_lock_expired,
7827         .establish_clid = nfs4_init_clientid,
7828 };
7829
7830 #if defined(CONFIG_NFS_V4_1)
7831 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7832         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7833         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7834         .recover_open   = nfs41_open_expired,
7835         .recover_lock   = nfs41_lock_expired,
7836         .establish_clid = nfs41_init_clientid,
7837 };
7838 #endif /* CONFIG_NFS_V4_1 */
7839
7840 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7841         .sched_state_renewal = nfs4_proc_async_renew,
7842         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7843         .renew_lease = nfs4_proc_renew,
7844 };
7845
7846 #if defined(CONFIG_NFS_V4_1)
7847 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7848         .sched_state_renewal = nfs41_proc_async_sequence,
7849         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7850         .renew_lease = nfs4_proc_sequence,
7851 };
7852 #endif
7853
7854 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7855         .minor_version = 0,
7856         .init_caps = NFS_CAP_READDIRPLUS
7857                 | NFS_CAP_ATOMIC_OPEN
7858                 | NFS_CAP_CHANGE_ATTR
7859                 | NFS_CAP_POSIX_LOCK,
7860         .init_client = nfs40_init_client,
7861         .shutdown_client = nfs40_shutdown_client,
7862         .match_stateid = nfs4_match_stateid,
7863         .find_root_sec = nfs4_find_root_sec,
7864         .free_lock_state = nfs4_release_lockowner,
7865         .call_sync_ops = &nfs40_call_sync_ops,
7866         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7867         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7868         .state_renewal_ops = &nfs40_state_renewal_ops,
7869 };
7870
7871 #if defined(CONFIG_NFS_V4_1)
7872 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7873         .minor_version = 1,
7874         .init_caps = NFS_CAP_READDIRPLUS
7875                 | NFS_CAP_ATOMIC_OPEN
7876                 | NFS_CAP_CHANGE_ATTR
7877                 | NFS_CAP_POSIX_LOCK
7878                 | NFS_CAP_STATEID_NFSV41
7879                 | NFS_CAP_ATOMIC_OPEN_V1,
7880         .init_client = nfs41_init_client,
7881         .shutdown_client = nfs41_shutdown_client,
7882         .match_stateid = nfs41_match_stateid,
7883         .find_root_sec = nfs41_find_root_sec,
7884         .free_lock_state = nfs41_free_lock_state,
7885         .call_sync_ops = &nfs41_call_sync_ops,
7886         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7887         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7888         .state_renewal_ops = &nfs41_state_renewal_ops,
7889 };
7890 #endif
7891
7892 #if defined(CONFIG_NFS_V4_2)
7893 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7894         .minor_version = 2,
7895         .init_caps = NFS_CAP_READDIRPLUS
7896                 | NFS_CAP_ATOMIC_OPEN
7897                 | NFS_CAP_CHANGE_ATTR
7898                 | NFS_CAP_POSIX_LOCK
7899                 | NFS_CAP_STATEID_NFSV41
7900                 | NFS_CAP_ATOMIC_OPEN_V1,
7901         .init_client = nfs41_init_client,
7902         .shutdown_client = nfs41_shutdown_client,
7903         .match_stateid = nfs41_match_stateid,
7904         .find_root_sec = nfs41_find_root_sec,
7905         .free_lock_state = nfs41_free_lock_state,
7906         .call_sync_ops = &nfs41_call_sync_ops,
7907         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7908         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7909         .state_renewal_ops = &nfs41_state_renewal_ops,
7910 };
7911 #endif
7912
7913 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7914         [0] = &nfs_v4_0_minor_ops,
7915 #if defined(CONFIG_NFS_V4_1)
7916         [1] = &nfs_v4_1_minor_ops,
7917 #endif
7918 #if defined(CONFIG_NFS_V4_2)
7919         [2] = &nfs_v4_2_minor_ops,
7920 #endif
7921 };
7922
7923 static const struct inode_operations nfs4_dir_inode_operations = {
7924         .create         = nfs_create,
7925         .lookup         = nfs_lookup,
7926         .atomic_open    = nfs_atomic_open,
7927         .link           = nfs_link,
7928         .unlink         = nfs_unlink,
7929         .symlink        = nfs_symlink,
7930         .mkdir          = nfs_mkdir,
7931         .rmdir          = nfs_rmdir,
7932         .mknod          = nfs_mknod,
7933         .rename         = nfs_rename,
7934         .permission     = nfs_permission,
7935         .getattr        = nfs_getattr,
7936         .setattr        = nfs_setattr,
7937         .getxattr       = generic_getxattr,
7938         .setxattr       = generic_setxattr,
7939         .listxattr      = generic_listxattr,
7940         .removexattr    = generic_removexattr,
7941 };
7942
7943 static const struct inode_operations nfs4_file_inode_operations = {
7944         .permission     = nfs_permission,
7945         .getattr        = nfs_getattr,
7946         .setattr        = nfs_setattr,
7947         .getxattr       = generic_getxattr,
7948         .setxattr       = generic_setxattr,
7949         .listxattr      = generic_listxattr,
7950         .removexattr    = generic_removexattr,
7951 };
7952
7953 const struct nfs_rpc_ops nfs_v4_clientops = {
7954         .version        = 4,                    /* protocol version */
7955         .dentry_ops     = &nfs4_dentry_operations,
7956         .dir_inode_ops  = &nfs4_dir_inode_operations,
7957         .file_inode_ops = &nfs4_file_inode_operations,
7958         .file_ops       = &nfs4_file_operations,
7959         .getroot        = nfs4_proc_get_root,
7960         .submount       = nfs4_submount,
7961         .try_mount      = nfs4_try_mount,
7962         .getattr        = nfs4_proc_getattr,
7963         .setattr        = nfs4_proc_setattr,
7964         .lookup         = nfs4_proc_lookup,
7965         .access         = nfs4_proc_access,
7966         .readlink       = nfs4_proc_readlink,
7967         .create         = nfs4_proc_create,
7968         .remove         = nfs4_proc_remove,
7969         .unlink_setup   = nfs4_proc_unlink_setup,
7970         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7971         .unlink_done    = nfs4_proc_unlink_done,
7972         .rename         = nfs4_proc_rename,
7973         .rename_setup   = nfs4_proc_rename_setup,
7974         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7975         .rename_done    = nfs4_proc_rename_done,
7976         .link           = nfs4_proc_link,
7977         .symlink        = nfs4_proc_symlink,
7978         .mkdir          = nfs4_proc_mkdir,
7979         .rmdir          = nfs4_proc_remove,
7980         .readdir        = nfs4_proc_readdir,
7981         .mknod          = nfs4_proc_mknod,
7982         .statfs         = nfs4_proc_statfs,
7983         .fsinfo         = nfs4_proc_fsinfo,
7984         .pathconf       = nfs4_proc_pathconf,
7985         .set_capabilities = nfs4_server_capabilities,
7986         .decode_dirent  = nfs4_decode_dirent,
7987         .read_setup     = nfs4_proc_read_setup,
7988         .read_pageio_init = pnfs_pageio_init_read,
7989         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7990         .read_done      = nfs4_read_done,
7991         .write_setup    = nfs4_proc_write_setup,
7992         .write_pageio_init = pnfs_pageio_init_write,
7993         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7994         .write_done     = nfs4_write_done,
7995         .commit_setup   = nfs4_proc_commit_setup,
7996         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7997         .commit_done    = nfs4_commit_done,
7998         .lock           = nfs4_proc_lock,
7999         .clear_acl_cache = nfs4_zap_acl_attr,
8000         .close_context  = nfs4_close_context,
8001         .open_context   = nfs4_atomic_open,
8002         .have_delegation = nfs4_have_delegation,
8003         .return_delegation = nfs4_inode_return_delegation,
8004         .alloc_client   = nfs4_alloc_client,
8005         .init_client    = nfs4_init_client,
8006         .free_client    = nfs4_free_client,
8007         .create_server  = nfs4_create_server,
8008         .clone_server   = nfs_clone_server,
8009 };
8010
8011 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8012         .prefix = XATTR_NAME_NFSV4_ACL,
8013         .list   = nfs4_xattr_list_nfs4_acl,
8014         .get    = nfs4_xattr_get_nfs4_acl,
8015         .set    = nfs4_xattr_set_nfs4_acl,
8016 };
8017
8018 const struct xattr_handler *nfs4_xattr_handlers[] = {
8019         &nfs4_xattr_nfs4_acl_handler,
8020 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8021         &nfs4_xattr_nfs4_label_handler,
8022 #endif
8023         NULL
8024 };
8025
8026 /*
8027  * Local variables:
8028  *  c-basic-offset: 8
8029  * End:
8030  */