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   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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  66 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  67 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 static int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __func__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 197 {
 198         int res;
 199
 200         might_sleep();
 201
 202         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 203                         nfs_wait_bit_killable, TASK_KILLABLE);
 204         return res;
 205 }
 206
 207 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 208 {
 209         int res = 0;
 210
 211         might_sleep();
 212
 213         if (*timeout <= 0)
 214                 *timeout = NFS4_POLL_RETRY_MIN;
 215         if (*timeout > NFS4_POLL_RETRY_MAX)
 216                 *timeout = NFS4_POLL_RETRY_MAX;
 217         schedule_timeout_killable(*timeout);
 218         if (fatal_signal_pending(current))
 219                 res = -ERESTARTSYS;
 220         *timeout <<= 1;
 221         return res;
 222 }
 223
 224 /* This is the error handling routine for processes that are allowed
 225  * to sleep.
 226  */
 227 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 228 {
 229         struct nfs_client *clp = server->nfs_client;
 230         struct nfs4_state *state = exception->state;
 231         int ret = errorcode;
 232
 233         exception->retry = 0;
 234         switch(errorcode) {
 235                 case 0:
 236                         return 0;
 237                 case -NFS4ERR_ADMIN_REVOKED:
 238                 case -NFS4ERR_BAD_STATEID:
 239                 case -NFS4ERR_OPENMODE:
 240                         if (state == NULL)
 241                                 break;
 242                         nfs4_state_mark_reclaim_nograce(clp, state);
 243                 case -NFS4ERR_STALE_CLIENTID:
 244                 case -NFS4ERR_STALE_STATEID:
 245                 case -NFS4ERR_EXPIRED:
 246                         nfs4_schedule_state_recovery(clp);
 247                         ret = nfs4_wait_clnt_recover(clp);
 248                         if (ret == 0)
 249                                 exception->retry = 1;
 250                         break;
 251                 case -NFS4ERR_FILE_OPEN:
 252                 case -NFS4ERR_GRACE:
 253                 case -NFS4ERR_DELAY:
 254                         ret = nfs4_delay(server->client, &exception->timeout);
 255                         if (ret != 0)
 256                                 break;
 257                 case -NFS4ERR_OLD_STATEID:
 258                         exception->retry = 1;
 259         }
 260         /* We failed to handle the error */
 261         return nfs4_map_errors(ret);
 262 }
 263
 264
 265 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 266 {
 267         struct nfs_client *clp = server->nfs_client;
 268         spin_lock(&clp->cl_lock);
 269         if (time_before(clp->cl_last_renewal,timestamp))
 270                 clp->cl_last_renewal = timestamp;
 271         spin_unlock(&clp->cl_lock);
 272 }
 273
 274 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 275 {
 276         struct nfs_inode *nfsi = NFS_I(dir);
 277
 278         spin_lock(&dir->i_lock);
 279         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 280         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 281                 nfs_force_lookup_revalidate(dir);
 282         nfsi->change_attr = cinfo->after;
 283         spin_unlock(&dir->i_lock);
 284 }
 285
 286 struct nfs4_opendata {
 287         struct kref kref;
 288         struct nfs_openargs o_arg;
 289         struct nfs_openres o_res;
 290         struct nfs_open_confirmargs c_arg;
 291         struct nfs_open_confirmres c_res;
 292         struct nfs_fattr f_attr;
 293         struct nfs_fattr dir_attr;
 294         struct path path;
 295         struct dentry *dir;
 296         struct nfs4_state_owner *owner;
 297         struct nfs4_state *state;
 298         struct iattr attrs;
 299         unsigned long timestamp;
 300         unsigned int rpc_done : 1;
 301         int rpc_status;
 302         int cancelled;
 303 };
 304
 305
 306 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 307 {
 308         p->o_res.f_attr = &p->f_attr;
 309         p->o_res.dir_attr = &p->dir_attr;
 310         p->o_res.seqid = p->o_arg.seqid;
 311         p->c_res.seqid = p->c_arg.seqid;
 312         p->o_res.server = p->o_arg.server;
 313         nfs_fattr_init(&p->f_attr);
 314         nfs_fattr_init(&p->dir_attr);
 315 }
 316
 317 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 318                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 319                 const struct iattr *attrs)
 320 {
 321         struct dentry *parent = dget_parent(path->dentry);
 322         struct inode *dir = parent->d_inode;
 323         struct nfs_server *server = NFS_SERVER(dir);
 324         struct nfs4_opendata *p;
 325
 326         p = kzalloc(sizeof(*p), GFP_KERNEL);
 327         if (p == NULL)
 328                 goto err;
 329         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 330         if (p->o_arg.seqid == NULL)
 331                 goto err_free;
 332         p->path.mnt = mntget(path->mnt);
 333         p->path.dentry = dget(path->dentry);
 334         p->dir = parent;
 335         p->owner = sp;
 336         atomic_inc(&sp->so_count);
 337         p->o_arg.fh = NFS_FH(dir);
 338         p->o_arg.open_flags = flags;
 339         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 340         p->o_arg.clientid = server->nfs_client->cl_clientid;
 341         p->o_arg.id = sp->so_owner_id.id;
 342         p->o_arg.name = &p->path.dentry->d_name;
 343         p->o_arg.server = server;
 344         p->o_arg.bitmask = server->attr_bitmask;
 345         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 346         if (flags & O_EXCL) {
 347                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 348                 s[0] = jiffies;
 349                 s[1] = current->pid;
 350         } else if (flags & O_CREAT) {
 351                 p->o_arg.u.attrs = &p->attrs;
 352                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 353         }
 354         p->c_arg.fh = &p->o_res.fh;
 355         p->c_arg.stateid = &p->o_res.stateid;
 356         p->c_arg.seqid = p->o_arg.seqid;
 357         nfs4_init_opendata_res(p);
 358         kref_init(&p->kref);
 359         return p;
 360 err_free:
 361         kfree(p);
 362 err:
 363         dput(parent);
 364         return NULL;
 365 }
 366
 367 static void nfs4_opendata_free(struct kref *kref)
 368 {
 369         struct nfs4_opendata *p = container_of(kref,
 370                         struct nfs4_opendata, kref);
 371
 372         nfs_free_seqid(p->o_arg.seqid);
 373         if (p->state != NULL)
 374                 nfs4_put_open_state(p->state);
 375         nfs4_put_state_owner(p->owner);
 376         dput(p->dir);
 377         path_put(&p->path);
 378         kfree(p);
 379 }
 380
 381 static void nfs4_opendata_put(struct nfs4_opendata *p)
 382 {
 383         if (p != NULL)
 384                 kref_put(&p->kref, nfs4_opendata_free);
 385 }
 386
 387 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 388 {
 389         int ret;
 390
 391         ret = rpc_wait_for_completion_task(task);
 392         return ret;
 393 }
 394
 395 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 396 {
 397         int ret = 0;
 398
 399         if (open_mode & O_EXCL)
 400                 goto out;
 401         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 402                 case FMODE_READ:
 403                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 404                         break;
 405                 case FMODE_WRITE:
 406                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 407                         break;
 408                 case FMODE_READ|FMODE_WRITE:
 409                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 410         }
 411 out:
 412         return ret;
 413 }
 414
 415 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 416 {
 417         if ((delegation->type & fmode) != fmode)
 418                 return 0;
 419         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 420                 return 0;
 421         nfs_mark_delegation_referenced(delegation);
 422         return 1;
 423 }
 424
 425 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 426 {
 427         switch (fmode) {
 428                 case FMODE_WRITE:
 429                         state->n_wronly++;
 430                         break;
 431                 case FMODE_READ:
 432                         state->n_rdonly++;
 433                         break;
 434                 case FMODE_READ|FMODE_WRITE:
 435                         state->n_rdwr++;
 436         }
 437         nfs4_state_set_mode_locked(state, state->state | fmode);
 438 }
 439
 440 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 441 {
 442         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 443                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 444         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 445         switch (fmode) {
 446                 case FMODE_READ:
 447                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 448                         break;
 449                 case FMODE_WRITE:
 450                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 451                         break;
 452                 case FMODE_READ|FMODE_WRITE:
 453                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 454         }
 455 }
 456
 457 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 458 {
 459         write_seqlock(&state->seqlock);
 460         nfs_set_open_stateid_locked(state, stateid, fmode);
 461         write_sequnlock(&state->seqlock);
 462 }
 463
 464 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 465 {
 466         /*
 467          * Protect the call to nfs4_state_set_mode_locked and
 468          * serialise the stateid update
 469          */
 470         write_seqlock(&state->seqlock);
 471         if (deleg_stateid != NULL) {
 472                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 473                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 474         }
 475         if (open_stateid != NULL)
 476                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 477         write_sequnlock(&state->seqlock);
 478         spin_lock(&state->owner->so_lock);
 479         update_open_stateflags(state, fmode);
 480         spin_unlock(&state->owner->so_lock);
 481 }
 482
 483 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 484 {
 485         struct nfs_inode *nfsi = NFS_I(state->inode);
 486         struct nfs_delegation *deleg_cur;
 487         int ret = 0;
 488
 489         fmode &= (FMODE_READ|FMODE_WRITE);
 490
 491         rcu_read_lock();
 492         deleg_cur = rcu_dereference(nfsi->delegation);
 493         if (deleg_cur == NULL)
 494                 goto no_delegation;
 495
 496         spin_lock(&deleg_cur->lock);
 497         if (nfsi->delegation != deleg_cur ||
 498             (deleg_cur->type & fmode) != fmode)
 499                 goto no_delegation_unlock;
 500
 501         if (delegation == NULL)
 502                 delegation = &deleg_cur->stateid;
 503         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 504                 goto no_delegation_unlock;
 505
 506         nfs_mark_delegation_referenced(deleg_cur);
 507         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 508         ret = 1;
 509 no_delegation_unlock:
 510         spin_unlock(&deleg_cur->lock);
 511 no_delegation:
 512         rcu_read_unlock();
 513
 514         if (!ret && open_stateid != NULL) {
 515                 __update_open_stateid(state, open_stateid, NULL, fmode);
 516                 ret = 1;
 517         }
 518
 519         return ret;
 520 }
 521
 522
 523 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 524 {
 525         struct nfs_delegation *delegation;
 526
 527         rcu_read_lock();
 528         delegation = rcu_dereference(NFS_I(inode)->delegation);
 529         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 530                 rcu_read_unlock();
 531                 return;
 532         }
 533         rcu_read_unlock();
 534         nfs_inode_return_delegation(inode);
 535 }
 536
 537 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 538 {
 539         struct nfs4_state *state = opendata->state;
 540         struct nfs_inode *nfsi = NFS_I(state->inode);
 541         struct nfs_delegation *delegation;
 542         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 543         fmode_t fmode = opendata->o_arg.fmode;
 544         nfs4_stateid stateid;
 545         int ret = -EAGAIN;
 546
 547         for (;;) {
 548                 if (can_open_cached(state, fmode, open_mode)) {
 549                         spin_lock(&state->owner->so_lock);
 550                         if (can_open_cached(state, fmode, open_mode)) {
 551                                 update_open_stateflags(state, fmode);
 552                                 spin_unlock(&state->owner->so_lock);
 553                                 goto out_return_state;
 554                         }
 555                         spin_unlock(&state->owner->so_lock);
 556                 }
 557                 rcu_read_lock();
 558                 delegation = rcu_dereference(nfsi->delegation);
 559                 if (delegation == NULL ||
 560                     !can_open_delegated(delegation, fmode)) {
 561                         rcu_read_unlock();
 562                         break;
 563                 }
 564                 /* Save the delegation */
 565                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 566                 rcu_read_unlock();
 567                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 568                 if (ret != 0)
 569                         goto out;
 570                 ret = -EAGAIN;
 571
 572                 /* Try to update the stateid using the delegation */
 573                 if (update_open_stateid(state, NULL, &stateid, fmode))
 574                         goto out_return_state;
 575         }
 576 out:
 577         return ERR_PTR(ret);
 578 out_return_state:
 579         atomic_inc(&state->count);
 580         return state;
 581 }
 582
 583 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 584 {
 585         struct inode *inode;
 586         struct nfs4_state *state = NULL;
 587         struct nfs_delegation *delegation;
 588         int ret;
 589
 590         if (!data->rpc_done) {
 591                 state = nfs4_try_open_cached(data);
 592                 goto out;
 593         }
 594
 595         ret = -EAGAIN;
 596         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 597                 goto err;
 598         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 599         ret = PTR_ERR(inode);
 600         if (IS_ERR(inode))
 601                 goto err;
 602         ret = -ENOMEM;
 603         state = nfs4_get_open_state(inode, data->owner);
 604         if (state == NULL)
 605                 goto err_put_inode;
 606         if (data->o_res.delegation_type != 0) {
 607                 int delegation_flags = 0;
 608
 609                 rcu_read_lock();
 610                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 611                 if (delegation)
 612                         delegation_flags = delegation->flags;
 613                 rcu_read_unlock();
 614                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 615                         nfs_inode_set_delegation(state->inode,
 616                                         data->owner->so_cred,
 617                                         &data->o_res);
 618                 else
 619                         nfs_inode_reclaim_delegation(state->inode,
 620                                         data->owner->so_cred,
 621                                         &data->o_res);
 622         }
 623
 624         update_open_stateid(state, &data->o_res.stateid, NULL,
 625                         data->o_arg.fmode);
 626         iput(inode);
 627 out:
 628         return state;
 629 err_put_inode:
 630         iput(inode);
 631 err:
 632         return ERR_PTR(ret);
 633 }
 634
 635 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 636 {
 637         struct nfs_inode *nfsi = NFS_I(state->inode);
 638         struct nfs_open_context *ctx;
 639
 640         spin_lock(&state->inode->i_lock);
 641         list_for_each_entry(ctx, &nfsi->open_files, list) {
 642                 if (ctx->state != state)
 643                         continue;
 644                 get_nfs_open_context(ctx);
 645                 spin_unlock(&state->inode->i_lock);
 646                 return ctx;
 647         }
 648         spin_unlock(&state->inode->i_lock);
 649         return ERR_PTR(-ENOENT);
 650 }
 651
 652 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 653 {
 654         struct nfs4_opendata *opendata;
 655
 656         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 657         if (opendata == NULL)
 658                 return ERR_PTR(-ENOMEM);
 659         opendata->state = state;
 660         atomic_inc(&state->count);
 661         return opendata;
 662 }
 663
 664 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 665 {
 666         struct nfs4_state *newstate;
 667         int ret;
 668
 669         opendata->o_arg.open_flags = 0;
 670         opendata->o_arg.fmode = fmode;
 671         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 672         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 673         nfs4_init_opendata_res(opendata);
 674         ret = _nfs4_proc_open(opendata);
 675         if (ret != 0)
 676                 return ret;
 677         newstate = nfs4_opendata_to_nfs4_state(opendata);
 678         if (IS_ERR(newstate))
 679                 return PTR_ERR(newstate);
 680         nfs4_close_state(&opendata->path, newstate, fmode);
 681         *res = newstate;
 682         return 0;
 683 }
 684
 685 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 686 {
 687         struct nfs4_state *newstate;
 688         int ret;
 689
 690         /* memory barrier prior to reading state->n_* */
 691         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 692         smp_rmb();
 693         if (state->n_rdwr != 0) {
 694                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 695                 if (ret != 0)
 696                         return ret;
 697                 if (newstate != state)
 698                         return -ESTALE;
 699         }
 700         if (state->n_wronly != 0) {
 701                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 702                 if (ret != 0)
 703                         return ret;
 704                 if (newstate != state)
 705                         return -ESTALE;
 706         }
 707         if (state->n_rdonly != 0) {
 708                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 709                 if (ret != 0)
 710                         return ret;
 711                 if (newstate != state)
 712                         return -ESTALE;
 713         }
 714         /*
 715          * We may have performed cached opens for all three recoveries.
 716          * Check if we need to update the current stateid.
 717          */
 718         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 719             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 720                 write_seqlock(&state->seqlock);
 721                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 722                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 723                 write_sequnlock(&state->seqlock);
 724         }
 725         return 0;
 726 }
 727
 728 /*
 729  * OPEN_RECLAIM:
 730  *      reclaim state on the server after a reboot.
 731  */
 732 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 733 {
 734         struct nfs_delegation *delegation;
 735         struct nfs4_opendata *opendata;
 736         fmode_t delegation_type = 0;
 737         int status;
 738
 739         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 740         if (IS_ERR(opendata))
 741                 return PTR_ERR(opendata);
 742         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 743         opendata->o_arg.fh = NFS_FH(state->inode);
 744         rcu_read_lock();
 745         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 746         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
 747                 delegation_type = delegation->type;
 748         rcu_read_unlock();
 749         opendata->o_arg.u.delegation_type = delegation_type;
 750         status = nfs4_open_recover(opendata, state);
 751         nfs4_opendata_put(opendata);
 752         return status;
 753 }
 754
 755 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 756 {
 757         struct nfs_server *server = NFS_SERVER(state->inode);
 758         struct nfs4_exception exception = { };
 759         int err;
 760         do {
 761                 err = _nfs4_do_open_reclaim(ctx, state);
 762                 if (err != -NFS4ERR_DELAY)
 763                         break;
 764                 nfs4_handle_exception(server, err, &exception);
 765         } while (exception.retry);
 766         return err;
 767 }
 768
 769 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 770 {
 771         struct nfs_open_context *ctx;
 772         int ret;
 773
 774         ctx = nfs4_state_find_open_context(state);
 775         if (IS_ERR(ctx))
 776                 return PTR_ERR(ctx);
 777         ret = nfs4_do_open_reclaim(ctx, state);
 778         put_nfs_open_context(ctx);
 779         return ret;
 780 }
 781
 782 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 783 {
 784         struct nfs4_opendata *opendata;
 785         int ret;
 786
 787         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 788         if (IS_ERR(opendata))
 789                 return PTR_ERR(opendata);
 790         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 791         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 792                         sizeof(opendata->o_arg.u.delegation.data));
 793         ret = nfs4_open_recover(opendata, state);
 794         nfs4_opendata_put(opendata);
 795         return ret;
 796 }
 797
 798 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 799 {
 800         struct nfs4_exception exception = { };
 801         struct nfs_server *server = NFS_SERVER(state->inode);
 802         int err;
 803         do {
 804                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 805                 switch (err) {
 806                         case 0:
 807                                 return err;
 808                         case -NFS4ERR_STALE_CLIENTID:
 809                         case -NFS4ERR_STALE_STATEID:
 810                         case -NFS4ERR_EXPIRED:
 811                                 /* Don't recall a delegation if it was lost */
 812                                 nfs4_schedule_state_recovery(server->nfs_client);
 813                                 return err;
 814                 }
 815                 err = nfs4_handle_exception(server, err, &exception);
 816         } while (exception.retry);
 817         return err;
 818 }
 819
 820 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 821 {
 822         struct nfs4_opendata *data = calldata;
 823
 824         data->rpc_status = task->tk_status;
 825         if (RPC_ASSASSINATED(task))
 826                 return;
 827         if (data->rpc_status == 0) {
 828                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 829                                 sizeof(data->o_res.stateid.data));
 830                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 831                 renew_lease(data->o_res.server, data->timestamp);
 832                 data->rpc_done = 1;
 833         }
 834 }
 835
 836 static void nfs4_open_confirm_release(void *calldata)
 837 {
 838         struct nfs4_opendata *data = calldata;
 839         struct nfs4_state *state = NULL;
 840
 841         /* If this request hasn't been cancelled, do nothing */
 842         if (data->cancelled == 0)
 843                 goto out_free;
 844         /* In case of error, no cleanup! */
 845         if (!data->rpc_done)
 846                 goto out_free;
 847         state = nfs4_opendata_to_nfs4_state(data);
 848         if (!IS_ERR(state))
 849                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 850 out_free:
 851         nfs4_opendata_put(data);
 852 }
 853
 854 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 855         .rpc_call_done = nfs4_open_confirm_done,
 856         .rpc_release = nfs4_open_confirm_release,
 857 };
 858
 859 /*
 860  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 861  */
 862 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 863 {
 864         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 865         struct rpc_task *task;
 866         struct  rpc_message msg = {
 867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 868                 .rpc_argp = &data->c_arg,
 869                 .rpc_resp = &data->c_res,
 870                 .rpc_cred = data->owner->so_cred,
 871         };
 872         struct rpc_task_setup task_setup_data = {
 873                 .rpc_client = server->client,
 874                 .rpc_message = &msg,
 875                 .callback_ops = &nfs4_open_confirm_ops,
 876                 .callback_data = data,
 877                 .workqueue = nfsiod_workqueue,
 878                 .flags = RPC_TASK_ASYNC,
 879         };
 880         int status;
 881
 882         kref_get(&data->kref);
 883         data->rpc_done = 0;
 884         data->rpc_status = 0;
 885         data->timestamp = jiffies;
 886         task = rpc_run_task(&task_setup_data);
 887         if (IS_ERR(task))
 888                 return PTR_ERR(task);
 889         status = nfs4_wait_for_completion_rpc_task(task);
 890         if (status != 0) {
 891                 data->cancelled = 1;
 892                 smp_wmb();
 893         } else
 894                 status = data->rpc_status;
 895         rpc_put_task(task);
 896         return status;
 897 }
 898
 899 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 900 {
 901         struct nfs4_opendata *data = calldata;
 902         struct nfs4_state_owner *sp = data->owner;
 903
 904         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 905                 return;
 906         /*
 907          * Check if we still need to send an OPEN call, or if we can use
 908          * a delegation instead.
 909          */
 910         if (data->state != NULL) {
 911                 struct nfs_delegation *delegation;
 912
 913                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
 914                         goto out_no_action;
 915                 rcu_read_lock();
 916                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 917                 if (delegation != NULL &&
 918                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
 919                         rcu_read_unlock();
 920                         goto out_no_action;
 921                 }
 922                 rcu_read_unlock();
 923         }
 924         /* Update sequence id. */
 925         data->o_arg.id = sp->so_owner_id.id;
 926         data->o_arg.clientid = sp->so_client->cl_clientid;
 927         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 928                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 929                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 930         }
 931         data->timestamp = jiffies;
 932         rpc_call_start(task);
 933         return;
 934 out_no_action:
 935         task->tk_action = NULL;
 936
 937 }
 938
 939 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 940 {
 941         struct nfs4_opendata *data = calldata;
 942
 943         data->rpc_status = task->tk_status;
 944         if (RPC_ASSASSINATED(task))
 945                 return;
 946         if (task->tk_status == 0) {
 947                 switch (data->o_res.f_attr->mode & S_IFMT) {
 948                         case S_IFREG:
 949                                 break;
 950                         case S_IFLNK:
 951                                 data->rpc_status = -ELOOP;
 952                                 break;
 953                         case S_IFDIR:
 954                                 data->rpc_status = -EISDIR;
 955                                 break;
 956                         default:
 957                                 data->rpc_status = -ENOTDIR;
 958                 }
 959                 renew_lease(data->o_res.server, data->timestamp);
 960                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 961                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 962         }
 963         data->rpc_done = 1;
 964 }
 965
 966 static void nfs4_open_release(void *calldata)
 967 {
 968         struct nfs4_opendata *data = calldata;
 969         struct nfs4_state *state = NULL;
 970
 971         /* If this request hasn't been cancelled, do nothing */
 972         if (data->cancelled == 0)
 973                 goto out_free;
 974         /* In case of error, no cleanup! */
 975         if (data->rpc_status != 0 || !data->rpc_done)
 976                 goto out_free;
 977         /* In case we need an open_confirm, no cleanup! */
 978         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 979                 goto out_free;
 980         state = nfs4_opendata_to_nfs4_state(data);
 981         if (!IS_ERR(state))
 982                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 983 out_free:
 984         nfs4_opendata_put(data);
 985 }
 986
 987 static const struct rpc_call_ops nfs4_open_ops = {
 988         .rpc_call_prepare = nfs4_open_prepare,
 989         .rpc_call_done = nfs4_open_done,
 990         .rpc_release = nfs4_open_release,
 991 };
 992
 993 /*
 994  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 995  */
 996 static int _nfs4_proc_open(struct nfs4_opendata *data)
 997 {
 998         struct inode *dir = data->dir->d_inode;
 999         struct nfs_server *server = NFS_SERVER(dir);
1000         struct nfs_openargs *o_arg = &data->o_arg;
1001         struct nfs_openres *o_res = &data->o_res;
1002         struct rpc_task *task;
1003         struct rpc_message msg = {
1004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1005                 .rpc_argp = o_arg,
1006                 .rpc_resp = o_res,
1007                 .rpc_cred = data->owner->so_cred,
1008         };
1009         struct rpc_task_setup task_setup_data = {
1010                 .rpc_client = server->client,
1011                 .rpc_message = &msg,
1012                 .callback_ops = &nfs4_open_ops,
1013                 .callback_data = data,
1014                 .workqueue = nfsiod_workqueue,
1015                 .flags = RPC_TASK_ASYNC,
1016         };
1017         int status;
1018
1019         kref_get(&data->kref);
1020         data->rpc_done = 0;
1021         data->rpc_status = 0;
1022         data->cancelled = 0;
1023         task = rpc_run_task(&task_setup_data);
1024         if (IS_ERR(task))
1025                 return PTR_ERR(task);
1026         status = nfs4_wait_for_completion_rpc_task(task);
1027         if (status != 0) {
1028                 data->cancelled = 1;
1029                 smp_wmb();
1030         } else
1031                 status = data->rpc_status;
1032         rpc_put_task(task);
1033         if (status != 0 || !data->rpc_done)
1034                 return status;
1035
1036         if (o_res->fh.size == 0)
1037                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1038
1039         if (o_arg->open_flags & O_CREAT) {
1040                 update_changeattr(dir, &o_res->cinfo);
1041                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1042         } else
1043                 nfs_refresh_inode(dir, o_res->dir_attr);
1044         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1045                 status = _nfs4_proc_open_confirm(data);
1046                 if (status != 0)
1047                         return status;
1048         }
1049         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1050                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1051         return 0;
1052 }
1053
1054 static int nfs4_recover_expired_lease(struct nfs_server *server)
1055 {
1056         struct nfs_client *clp = server->nfs_client;
1057         int ret;
1058
1059         for (;;) {
1060                 ret = nfs4_wait_clnt_recover(clp);
1061                 if (ret != 0)
1062                         return ret;
1063                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1064                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1065                         break;
1066                 nfs4_schedule_state_recovery(clp);
1067         }
1068         return 0;
1069 }
1070
1071 /*
1072  * OPEN_EXPIRED:
1073  *      reclaim state on the server after a network partition.
1074  *      Assumes caller holds the appropriate lock
1075  */
1076 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1077 {
1078         struct nfs4_opendata *opendata;
1079         int ret;
1080
1081         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1082         if (IS_ERR(opendata))
1083                 return PTR_ERR(opendata);
1084         ret = nfs4_open_recover(opendata, state);
1085         if (ret == -ESTALE)
1086                 d_drop(ctx->path.dentry);
1087         nfs4_opendata_put(opendata);
1088         return ret;
1089 }
1090
1091 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1092 {
1093         struct nfs_server *server = NFS_SERVER(state->inode);
1094         struct nfs4_exception exception = { };
1095         int err;
1096
1097         do {
1098                 err = _nfs4_open_expired(ctx, state);
1099                 if (err != -NFS4ERR_DELAY)
1100                         break;
1101                 nfs4_handle_exception(server, err, &exception);
1102         } while (exception.retry);
1103         return err;
1104 }
1105
1106 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1107 {
1108         struct nfs_open_context *ctx;
1109         int ret;
1110
1111         ctx = nfs4_state_find_open_context(state);
1112         if (IS_ERR(ctx))
1113                 return PTR_ERR(ctx);
1114         ret = nfs4_do_open_expired(ctx, state);
1115         put_nfs_open_context(ctx);
1116         return ret;
1117 }
1118
1119 /*
1120  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1121  * fields corresponding to attributes that were used to store the verifier.
1122  * Make sure we clobber those fields in the later setattr call
1123  */
1124 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1125 {
1126         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1127             !(sattr->ia_valid & ATTR_ATIME_SET))
1128                 sattr->ia_valid |= ATTR_ATIME;
1129
1130         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1131             !(sattr->ia_valid & ATTR_MTIME_SET))
1132                 sattr->ia_valid |= ATTR_MTIME;
1133 }
1134
1135 /*
1136  * Returns a referenced nfs4_state
1137  */
1138 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1139 {
1140         struct nfs4_state_owner  *sp;
1141         struct nfs4_state     *state = NULL;
1142         struct nfs_server       *server = NFS_SERVER(dir);
1143         struct nfs4_opendata *opendata;
1144         int status;
1145
1146         /* Protect against reboot recovery conflicts */
1147         status = -ENOMEM;
1148         if (!(sp = nfs4_get_state_owner(server, cred))) {
1149                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1150                 goto out_err;
1151         }
1152         status = nfs4_recover_expired_lease(server);
1153         if (status != 0)
1154                 goto err_put_state_owner;
1155         if (path->dentry->d_inode != NULL)
1156                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1157         status = -ENOMEM;
1158         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1159         if (opendata == NULL)
1160                 goto err_put_state_owner;
1161
1162         if (path->dentry->d_inode != NULL)
1163                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1164
1165         status = _nfs4_proc_open(opendata);
1166         if (status != 0)
1167                 goto err_opendata_put;
1168
1169         if (opendata->o_arg.open_flags & O_EXCL)
1170                 nfs4_exclusive_attrset(opendata, sattr);
1171
1172         state = nfs4_opendata_to_nfs4_state(opendata);
1173         status = PTR_ERR(state);
1174         if (IS_ERR(state))
1175                 goto err_opendata_put;
1176         nfs4_opendata_put(opendata);
1177         nfs4_put_state_owner(sp);
1178         *res = state;
1179         return 0;
1180 err_opendata_put:
1181         nfs4_opendata_put(opendata);
1182 err_put_state_owner:
1183         nfs4_put_state_owner(sp);
1184 out_err:
1185         *res = NULL;
1186         return status;
1187 }
1188
1189
1190 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1191 {
1192         struct nfs4_exception exception = { };
1193         struct nfs4_state *res;
1194         int status;
1195
1196         do {
1197                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1198                 if (status == 0)
1199                         break;
1200                 /* NOTE: BAD_SEQID means the server and client disagree about the
1201                  * book-keeping w.r.t. state-changing operations
1202                  * (OPEN/CLOSE/LOCK/LOCKU...)
1203                  * It is actually a sign of a bug on the client or on the server.
1204                  *
1205                  * If we receive a BAD_SEQID error in the particular case of
1206                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1207                  * have unhashed the old state_owner for us, and that we can
1208                  * therefore safely retry using a new one. We should still warn
1209                  * the user though...
1210                  */
1211                 if (status == -NFS4ERR_BAD_SEQID) {
1212                         printk(KERN_WARNING "NFS: v4 server %s "
1213                                         " returned a bad sequence-id error!\n",
1214                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1215                         exception.retry = 1;
1216                         continue;
1217                 }
1218                 /*
1219                  * BAD_STATEID on OPEN means that the server cancelled our
1220                  * state before it received the OPEN_CONFIRM.
1221                  * Recover by retrying the request as per the discussion
1222                  * on Page 181 of RFC3530.
1223                  */
1224                 if (status == -NFS4ERR_BAD_STATEID) {
1225                         exception.retry = 1;
1226                         continue;
1227                 }
1228                 if (status == -EAGAIN) {
1229                         /* We must have found a delegation */
1230                         exception.retry = 1;
1231                         continue;
1232                 }
1233                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1234                                         status, &exception));
1235         } while (exception.retry);
1236         return res;
1237 }
1238
1239 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1240                             struct nfs_fattr *fattr, struct iattr *sattr,
1241                             struct nfs4_state *state)
1242 {
1243         struct nfs_server *server = NFS_SERVER(inode);
1244         struct nfs_setattrargs  arg = {
1245                 .fh             = NFS_FH(inode),
1246                 .iap            = sattr,
1247                 .server         = server,
1248                 .bitmask = server->attr_bitmask,
1249         };
1250         struct nfs_setattrres  res = {
1251                 .fattr          = fattr,
1252                 .server         = server,
1253         };
1254         struct rpc_message msg = {
1255                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1256                 .rpc_argp       = &arg,
1257                 .rpc_resp       = &res,
1258                 .rpc_cred       = cred,
1259         };
1260         unsigned long timestamp = jiffies;
1261         int status;
1262
1263         nfs_fattr_init(fattr);
1264
1265         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1266                 /* Use that stateid */
1267         } else if (state != NULL) {
1268                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1269         } else
1270                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1271
1272         status = rpc_call_sync(server->client, &msg, 0);
1273         if (status == 0 && state != NULL)
1274                 renew_lease(server, timestamp);
1275         return status;
1276 }
1277
1278 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1279                            struct nfs_fattr *fattr, struct iattr *sattr,
1280                            struct nfs4_state *state)
1281 {
1282         struct nfs_server *server = NFS_SERVER(inode);
1283         struct nfs4_exception exception = { };
1284         int err;
1285         do {
1286                 err = nfs4_handle_exception(server,
1287                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1288                                 &exception);
1289         } while (exception.retry);
1290         return err;
1291 }
1292
1293 struct nfs4_closedata {
1294         struct path path;
1295         struct inode *inode;
1296         struct nfs4_state *state;
1297         struct nfs_closeargs arg;
1298         struct nfs_closeres res;
1299         struct nfs_fattr fattr;
1300         unsigned long timestamp;
1301 };
1302
1303 static void nfs4_free_closedata(void *data)
1304 {
1305         struct nfs4_closedata *calldata = data;
1306         struct nfs4_state_owner *sp = calldata->state->owner;
1307
1308         nfs4_put_open_state(calldata->state);
1309         nfs_free_seqid(calldata->arg.seqid);
1310         nfs4_put_state_owner(sp);
1311         path_put(&calldata->path);
1312         kfree(calldata);
1313 }
1314
1315 static void nfs4_close_done(struct rpc_task *task, void *data)
1316 {
1317         struct nfs4_closedata *calldata = data;
1318         struct nfs4_state *state = calldata->state;
1319         struct nfs_server *server = NFS_SERVER(calldata->inode);
1320
1321         if (RPC_ASSASSINATED(task))
1322                 return;
1323         /* hmm. we are done with the inode, and in the process of freeing
1324          * the state_owner. we keep this around to process errors
1325          */
1326         switch (task->tk_status) {
1327                 case 0:
1328                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1329                         renew_lease(server, calldata->timestamp);
1330                         break;
1331                 case -NFS4ERR_STALE_STATEID:
1332                 case -NFS4ERR_OLD_STATEID:
1333                 case -NFS4ERR_BAD_STATEID:
1334                 case -NFS4ERR_EXPIRED:
1335                         if (calldata->arg.fmode == 0)
1336                                 break;
1337                 default:
1338                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1339                                 rpc_restart_call(task);
1340                                 return;
1341                         }
1342         }
1343         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1344 }
1345
1346 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1347 {
1348         struct nfs4_closedata *calldata = data;
1349         struct nfs4_state *state = calldata->state;
1350         int clear_rd, clear_wr, clear_rdwr;
1351
1352         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1353                 return;
1354
1355         clear_rd = clear_wr = clear_rdwr = 0;
1356         spin_lock(&state->owner->so_lock);
1357         /* Calculate the change in open mode */
1358         if (state->n_rdwr == 0) {
1359                 if (state->n_rdonly == 0) {
1360                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1361                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1362                 }
1363                 if (state->n_wronly == 0) {
1364                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1365                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1366                 }
1367         }
1368         spin_unlock(&state->owner->so_lock);
1369         if (!clear_rd && !clear_wr && !clear_rdwr) {
1370                 /* Note: exit _without_ calling nfs4_close_done */
1371                 task->tk_action = NULL;
1372                 return;
1373         }
1374         nfs_fattr_init(calldata->res.fattr);
1375         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1376                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1377                 calldata->arg.fmode = FMODE_READ;
1378         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1379                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1380                 calldata->arg.fmode = FMODE_WRITE;
1381         }
1382         calldata->timestamp = jiffies;
1383         rpc_call_start(task);
1384 }
1385
1386 static const struct rpc_call_ops nfs4_close_ops = {
1387         .rpc_call_prepare = nfs4_close_prepare,
1388         .rpc_call_done = nfs4_close_done,
1389         .rpc_release = nfs4_free_closedata,
1390 };
1391
1392 /*
1393  * It is possible for data to be read/written from a mem-mapped file
1394  * after the sys_close call (which hits the vfs layer as a flush).
1395  * This means that we can't safely call nfsv4 close on a file until
1396  * the inode is cleared. This in turn means that we are not good
1397  * NFSv4 citizens - we do not indicate to the server to update the file's
1398  * share state even when we are done with one of the three share
1399  * stateid's in the inode.
1400  *
1401  * NOTE: Caller must be holding the sp->so_owner semaphore!
1402  */
1403 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1404 {
1405         struct nfs_server *server = NFS_SERVER(state->inode);
1406         struct nfs4_closedata *calldata;
1407         struct nfs4_state_owner *sp = state->owner;
1408         struct rpc_task *task;
1409         struct rpc_message msg = {
1410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1411                 .rpc_cred = state->owner->so_cred,
1412         };
1413         struct rpc_task_setup task_setup_data = {
1414                 .rpc_client = server->client,
1415                 .rpc_message = &msg,
1416                 .callback_ops = &nfs4_close_ops,
1417                 .workqueue = nfsiod_workqueue,
1418                 .flags = RPC_TASK_ASYNC,
1419         };
1420         int status = -ENOMEM;
1421
1422         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1423         if (calldata == NULL)
1424                 goto out;
1425         calldata->inode = state->inode;
1426         calldata->state = state;
1427         calldata->arg.fh = NFS_FH(state->inode);
1428         calldata->arg.stateid = &state->open_stateid;
1429         /* Serialization for the sequence id */
1430         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1431         if (calldata->arg.seqid == NULL)
1432                 goto out_free_calldata;
1433         calldata->arg.fmode = 0;
1434         calldata->arg.bitmask = server->cache_consistency_bitmask;
1435         calldata->res.fattr = &calldata->fattr;
1436         calldata->res.seqid = calldata->arg.seqid;
1437         calldata->res.server = server;
1438         calldata->path.mnt = mntget(path->mnt);
1439         calldata->path.dentry = dget(path->dentry);
1440
1441         msg.rpc_argp = &calldata->arg,
1442         msg.rpc_resp = &calldata->res,
1443         task_setup_data.callback_data = calldata;
1444         task = rpc_run_task(&task_setup_data);
1445         if (IS_ERR(task))
1446                 return PTR_ERR(task);
1447         status = 0;
1448         if (wait)
1449                 status = rpc_wait_for_completion_task(task);
1450         rpc_put_task(task);
1451         return status;
1452 out_free_calldata:
1453         kfree(calldata);
1454 out:
1455         nfs4_put_open_state(state);
1456         nfs4_put_state_owner(sp);
1457         return status;
1458 }
1459
1460 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1461 {
1462         struct file *filp;
1463         int ret;
1464
1465         /* If the open_intent is for execute, we have an extra check to make */
1466         if (fmode & FMODE_EXEC) {
1467                 ret = nfs_may_open(state->inode,
1468                                 state->owner->so_cred,
1469                                 nd->intent.open.flags);
1470                 if (ret < 0)
1471                         goto out_close;
1472         }
1473         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1474         if (!IS_ERR(filp)) {
1475                 struct nfs_open_context *ctx;
1476                 ctx = nfs_file_open_context(filp);
1477                 ctx->state = state;
1478                 return 0;
1479         }
1480         ret = PTR_ERR(filp);
1481 out_close:
1482         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1483         return ret;
1484 }
1485
1486 struct dentry *
1487 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1488 {
1489         struct path path = {
1490                 .mnt = nd->path.mnt,
1491                 .dentry = dentry,
1492         };
1493         struct dentry *parent;
1494         struct iattr attr;
1495         struct rpc_cred *cred;
1496         struct nfs4_state *state;
1497         struct dentry *res;
1498         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1499
1500         if (nd->flags & LOOKUP_CREATE) {
1501                 attr.ia_mode = nd->intent.open.create_mode;
1502                 attr.ia_valid = ATTR_MODE;
1503                 if (!IS_POSIXACL(dir))
1504                         attr.ia_mode &= ~current_umask();
1505         } else {
1506                 attr.ia_valid = 0;
1507                 BUG_ON(nd->intent.open.flags & O_CREAT);
1508         }
1509
1510         cred = rpc_lookup_cred();
1511         if (IS_ERR(cred))
1512                 return (struct dentry *)cred;
1513         parent = dentry->d_parent;
1514         /* Protect against concurrent sillydeletes */
1515         nfs_block_sillyrename(parent);
1516         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1517         put_rpccred(cred);
1518         if (IS_ERR(state)) {
1519                 if (PTR_ERR(state) == -ENOENT) {
1520                         d_add(dentry, NULL);
1521                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1522                 }
1523                 nfs_unblock_sillyrename(parent);
1524                 return (struct dentry *)state;
1525         }
1526         res = d_add_unique(dentry, igrab(state->inode));
1527         if (res != NULL)
1528                 path.dentry = res;
1529         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1530         nfs_unblock_sillyrename(parent);
1531         nfs4_intent_set_file(nd, &path, state, fmode);
1532         return res;
1533 }
1534
1535 int
1536 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1537 {
1538         struct path path = {
1539                 .mnt = nd->path.mnt,
1540                 .dentry = dentry,
1541         };
1542         struct rpc_cred *cred;
1543         struct nfs4_state *state;
1544         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1545
1546         cred = rpc_lookup_cred();
1547         if (IS_ERR(cred))
1548                 return PTR_ERR(cred);
1549         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1550         put_rpccred(cred);
1551         if (IS_ERR(state)) {
1552                 switch (PTR_ERR(state)) {
1553                         case -EPERM:
1554                         case -EACCES:
1555                         case -EDQUOT:
1556                         case -ENOSPC:
1557                         case -EROFS:
1558                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1559                                 return 1;
1560                         default:
1561                                 goto out_drop;
1562                 }
1563         }
1564         if (state->inode == dentry->d_inode) {
1565                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1566                 nfs4_intent_set_file(nd, &path, state, fmode);
1567                 return 1;
1568         }
1569         nfs4_close_sync(&path, state, fmode);
1570 out_drop:
1571         d_drop(dentry);
1572         return 0;
1573 }
1574
1575 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1576 {
1577         if (ctx->state == NULL)
1578                 return;
1579         if (is_sync)
1580                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1581         else
1582                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1583 }
1584
1585 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1586 {
1587         struct nfs4_server_caps_arg args = {
1588                 .fhandle = fhandle,
1589         };
1590         struct nfs4_server_caps_res res = {};
1591         struct rpc_message msg = {
1592                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1593                 .rpc_argp = &args,
1594                 .rpc_resp = &res,
1595         };
1596         int status;
1597
1598         status = rpc_call_sync(server->client, &msg, 0);
1599         if (status == 0) {
1600                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1601                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1602                         server->caps |= NFS_CAP_ACLS;
1603                 if (res.has_links != 0)
1604                         server->caps |= NFS_CAP_HARDLINKS;
1605                 if (res.has_symlinks != 0)
1606                         server->caps |= NFS_CAP_SYMLINKS;
1607                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1608                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1609                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1610                 server->acl_bitmask = res.acl_bitmask;
1611         }
1612         return status;
1613 }
1614
1615 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1616 {
1617         struct nfs4_exception exception = { };
1618         int err;
1619         do {
1620                 err = nfs4_handle_exception(server,
1621                                 _nfs4_server_capabilities(server, fhandle),
1622                                 &exception);
1623         } while (exception.retry);
1624         return err;
1625 }
1626
1627 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1628                 struct nfs_fsinfo *info)
1629 {
1630         struct nfs4_lookup_root_arg args = {
1631                 .bitmask = nfs4_fattr_bitmap,
1632         };
1633         struct nfs4_lookup_res res = {
1634                 .server = server,
1635                 .fattr = info->fattr,
1636                 .fh = fhandle,
1637         };
1638         struct rpc_message msg = {
1639                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1640                 .rpc_argp = &args,
1641                 .rpc_resp = &res,
1642         };
1643         nfs_fattr_init(info->fattr);
1644         return rpc_call_sync(server->client, &msg, 0);
1645 }
1646
1647 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1648                 struct nfs_fsinfo *info)
1649 {
1650         struct nfs4_exception exception = { };
1651         int err;
1652         do {
1653                 err = nfs4_handle_exception(server,
1654                                 _nfs4_lookup_root(server, fhandle, info),
1655                                 &exception);
1656         } while (exception.retry);
1657         return err;
1658 }
1659
1660 /*
1661  * get the file handle for the "/" directory on the server
1662  */
1663 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1664                               struct nfs_fsinfo *info)
1665 {
1666         int status;
1667
1668         status = nfs4_lookup_root(server, fhandle, info);
1669         if (status == 0)
1670                 status = nfs4_server_capabilities(server, fhandle);
1671         if (status == 0)
1672                 status = nfs4_do_fsinfo(server, fhandle, info);
1673         return nfs4_map_errors(status);
1674 }
1675
1676 /*
1677  * Get locations and (maybe) other attributes of a referral.
1678  * Note that we'll actually follow the referral later when
1679  * we detect fsid mismatch in inode revalidation
1680  */
1681 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1682 {
1683         int status = -ENOMEM;
1684         struct page *page = NULL;
1685         struct nfs4_fs_locations *locations = NULL;
1686
1687         page = alloc_page(GFP_KERNEL);
1688         if (page == NULL)
1689                 goto out;
1690         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1691         if (locations == NULL)
1692                 goto out;
1693
1694         status = nfs4_proc_fs_locations(dir, name, locations, page);
1695         if (status != 0)
1696                 goto out;
1697         /* Make sure server returned a different fsid for the referral */
1698         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1699                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1700                 status = -EIO;
1701                 goto out;
1702         }
1703
1704         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1705         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1706         if (!fattr->mode)
1707                 fattr->mode = S_IFDIR;
1708         memset(fhandle, 0, sizeof(struct nfs_fh));
1709 out:
1710         if (page)
1711                 __free_page(page);
1712         if (locations)
1713                 kfree(locations);
1714         return status;
1715 }
1716
1717 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1718 {
1719         struct nfs4_getattr_arg args = {
1720                 .fh = fhandle,
1721                 .bitmask = server->attr_bitmask,
1722         };
1723         struct nfs4_getattr_res res = {
1724                 .fattr = fattr,
1725                 .server = server,
1726         };
1727         struct rpc_message msg = {
1728                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1729                 .rpc_argp = &args,
1730                 .rpc_resp = &res,
1731         };
1732
1733         nfs_fattr_init(fattr);
1734         return rpc_call_sync(server->client, &msg, 0);
1735 }
1736
1737 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1738 {
1739         struct nfs4_exception exception = { };
1740         int err;
1741         do {
1742                 err = nfs4_handle_exception(server,
1743                                 _nfs4_proc_getattr(server, fhandle, fattr),
1744                                 &exception);
1745         } while (exception.retry);
1746         return err;
1747 }
1748
1749 /*
1750  * The file is not closed if it is opened due to the a request to change
1751  * the size of the file. The open call will not be needed once the
1752  * VFS layer lookup-intents are implemented.
1753  *
1754  * Close is called when the inode is destroyed.
1755  * If we haven't opened the file for O_WRONLY, we
1756  * need to in the size_change case to obtain a stateid.
1757  *
1758  * Got race?
1759  * Because OPEN is always done by name in nfsv4, it is
1760  * possible that we opened a different file by the same
1761  * name.  We can recognize this race condition, but we
1762  * can't do anything about it besides returning an error.
1763  *
1764  * This will be fixed with VFS changes (lookup-intent).
1765  */
1766 static int
1767 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1768                   struct iattr *sattr)
1769 {
1770         struct inode *inode = dentry->d_inode;
1771         struct rpc_cred *cred = NULL;
1772         struct nfs4_state *state = NULL;
1773         int status;
1774
1775         nfs_fattr_init(fattr);
1776
1777         /* Search for an existing open(O_WRITE) file */
1778         if (sattr->ia_valid & ATTR_FILE) {
1779                 struct nfs_open_context *ctx;
1780
1781                 ctx = nfs_file_open_context(sattr->ia_file);
1782                 if (ctx) {
1783                         cred = ctx->cred;
1784                         state = ctx->state;
1785                 }
1786         }
1787
1788         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1789         if (status == 0)
1790                 nfs_setattr_update_inode(inode, sattr);
1791         return status;
1792 }
1793
1794 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1795                 const struct qstr *name, struct nfs_fh *fhandle,
1796                 struct nfs_fattr *fattr)
1797 {
1798         int                    status;
1799         struct nfs4_lookup_arg args = {
1800                 .bitmask = server->attr_bitmask,
1801                 .dir_fh = dirfh,
1802                 .name = name,
1803         };
1804         struct nfs4_lookup_res res = {
1805                 .server = server,
1806                 .fattr = fattr,
1807                 .fh = fhandle,
1808         };
1809         struct rpc_message msg = {
1810                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1811                 .rpc_argp = &args,
1812                 .rpc_resp = &res,
1813         };
1814
1815         nfs_fattr_init(fattr);
1816
1817         dprintk("NFS call  lookupfh %s\n", name->name);
1818         status = rpc_call_sync(server->client, &msg, 0);
1819         dprintk("NFS reply lookupfh: %d\n", status);
1820         return status;
1821 }
1822
1823 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1824                               struct qstr *name, struct nfs_fh *fhandle,
1825                               struct nfs_fattr *fattr)
1826 {
1827         struct nfs4_exception exception = { };
1828         int err;
1829         do {
1830                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1831                 /* FIXME: !!!! */
1832                 if (err == -NFS4ERR_MOVED) {
1833                         err = -EREMOTE;
1834                         break;
1835                 }
1836                 err = nfs4_handle_exception(server, err, &exception);
1837         } while (exception.retry);
1838         return err;
1839 }
1840
1841 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1842                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1843 {
1844         int status;
1845
1846         dprintk("NFS call  lookup %s\n", name->name);
1847         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1848         if (status == -NFS4ERR_MOVED)
1849                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1850         dprintk("NFS reply lookup: %d\n", status);
1851         return status;
1852 }
1853
1854 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1855 {
1856         struct nfs4_exception exception = { };
1857         int err;
1858         do {
1859                 err = nfs4_handle_exception(NFS_SERVER(dir),
1860                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1861                                 &exception);
1862         } while (exception.retry);
1863         return err;
1864 }
1865
1866 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1867 {
1868         struct nfs_server *server = NFS_SERVER(inode);
1869         struct nfs_fattr fattr;
1870         struct nfs4_accessargs args = {
1871                 .fh = NFS_FH(inode),
1872                 .bitmask = server->attr_bitmask,
1873         };
1874         struct nfs4_accessres res = {
1875                 .server = server,
1876                 .fattr = &fattr,
1877         };
1878         struct rpc_message msg = {
1879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1880                 .rpc_argp = &args,
1881                 .rpc_resp = &res,
1882                 .rpc_cred = entry->cred,
1883         };
1884         int mode = entry->mask;
1885         int status;
1886
1887         /*
1888          * Determine which access bits we want to ask for...
1889          */
1890         if (mode & MAY_READ)
1891                 args.access |= NFS4_ACCESS_READ;
1892         if (S_ISDIR(inode->i_mode)) {
1893                 if (mode & MAY_WRITE)
1894                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1895                 if (mode & MAY_EXEC)
1896                         args.access |= NFS4_ACCESS_LOOKUP;
1897         } else {
1898                 if (mode & MAY_WRITE)
1899                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1900                 if (mode & MAY_EXEC)
1901                         args.access |= NFS4_ACCESS_EXECUTE;
1902         }
1903         nfs_fattr_init(&fattr);
1904         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1905         if (!status) {
1906                 entry->mask = 0;
1907                 if (res.access & NFS4_ACCESS_READ)
1908                         entry->mask |= MAY_READ;
1909                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1910                         entry->mask |= MAY_WRITE;
1911                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1912                         entry->mask |= MAY_EXEC;
1913                 nfs_refresh_inode(inode, &fattr);
1914         }
1915         return status;
1916 }
1917
1918 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1919 {
1920         struct nfs4_exception exception = { };
1921         int err;
1922         do {
1923                 err = nfs4_handle_exception(NFS_SERVER(inode),
1924                                 _nfs4_proc_access(inode, entry),
1925                                 &exception);
1926         } while (exception.retry);
1927         return err;
1928 }
1929
1930 /*
1931  * TODO: For the time being, we don't try to get any attributes
1932  * along with any of the zero-copy operations READ, READDIR,
1933  * READLINK, WRITE.
1934  *
1935  * In the case of the first three, we want to put the GETATTR
1936  * after the read-type operation -- this is because it is hard
1937  * to predict the length of a GETATTR response in v4, and thus
1938  * align the READ data correctly.  This means that the GETATTR
1939  * may end up partially falling into the page cache, and we should
1940  * shift it into the 'tail' of the xdr_buf before processing.
1941  * To do this efficiently, we need to know the total length
1942  * of data received, which doesn't seem to be available outside
1943  * of the RPC layer.
1944  *
1945  * In the case of WRITE, we also want to put the GETATTR after
1946  * the operation -- in this case because we want to make sure
1947  * we get the post-operation mtime and size.  This means that
1948  * we can't use xdr_encode_pages() as written: we need a variant
1949  * of it which would leave room in the 'tail' iovec.
1950  *
1951  * Both of these changes to the XDR layer would in fact be quite
1952  * minor, but I decided to leave them for a subsequent patch.
1953  */
1954 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1955                 unsigned int pgbase, unsigned int pglen)
1956 {
1957         struct nfs4_readlink args = {
1958                 .fh       = NFS_FH(inode),
1959                 .pgbase   = pgbase,
1960                 .pglen    = pglen,
1961                 .pages    = &page,
1962         };
1963         struct rpc_message msg = {
1964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1965                 .rpc_argp = &args,
1966                 .rpc_resp = NULL,
1967         };
1968
1969         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1970 }
1971
1972 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1973                 unsigned int pgbase, unsigned int pglen)
1974 {
1975         struct nfs4_exception exception = { };
1976         int err;
1977         do {
1978                 err = nfs4_handle_exception(NFS_SERVER(inode),
1979                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1980                                 &exception);
1981         } while (exception.retry);
1982         return err;
1983 }
1984
1985 /*
1986  * Got race?
1987  * We will need to arrange for the VFS layer to provide an atomic open.
1988  * Until then, this create/open method is prone to inefficiency and race
1989  * conditions due to the lookup, create, and open VFS calls from sys_open()
1990  * placed on the wire.
1991  *
1992  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1993  * The file will be opened again in the subsequent VFS open call
1994  * (nfs4_proc_file_open).
1995  *
1996  * The open for read will just hang around to be used by any process that
1997  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1998  */
1999
2000 static int
2001 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2002                  int flags, struct nameidata *nd)
2003 {
2004         struct path path = {
2005                 .mnt = nd->path.mnt,
2006                 .dentry = dentry,
2007         };
2008         struct nfs4_state *state;
2009         struct rpc_cred *cred;
2010         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2011         int status = 0;
2012
2013         cred = rpc_lookup_cred();
2014         if (IS_ERR(cred)) {
2015                 status = PTR_ERR(cred);
2016                 goto out;
2017         }
2018         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2019         d_drop(dentry);
2020         if (IS_ERR(state)) {
2021                 status = PTR_ERR(state);
2022                 goto out_putcred;
2023         }
2024         d_add(dentry, igrab(state->inode));
2025         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2026         if (flags & O_EXCL) {
2027                 struct nfs_fattr fattr;
2028                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2029                 if (status == 0)
2030                         nfs_setattr_update_inode(state->inode, sattr);
2031                 nfs_post_op_update_inode(state->inode, &fattr);
2032         }
2033         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2034                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2035         else
2036                 nfs4_close_sync(&path, state, fmode);
2037 out_putcred:
2038         put_rpccred(cred);
2039 out:
2040         return status;
2041 }
2042
2043 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2044 {
2045         struct nfs_server *server = NFS_SERVER(dir);
2046         struct nfs_removeargs args = {
2047                 .fh = NFS_FH(dir),
2048                 .name.len = name->len,
2049                 .name.name = name->name,
2050                 .bitmask = server->attr_bitmask,
2051         };
2052         struct nfs_removeres res = {
2053                 .server = server,
2054         };
2055         struct rpc_message msg = {
2056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2057                 .rpc_argp = &args,
2058                 .rpc_resp = &res,
2059         };
2060         int                     status;
2061
2062         nfs_fattr_init(&res.dir_attr);
2063         status = rpc_call_sync(server->client, &msg, 0);
2064         if (status == 0) {
2065                 update_changeattr(dir, &res.cinfo);
2066                 nfs_post_op_update_inode(dir, &res.dir_attr);
2067         }
2068         return status;
2069 }
2070
2071 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2072 {
2073         struct nfs4_exception exception = { };
2074         int err;
2075         do {
2076                 err = nfs4_handle_exception(NFS_SERVER(dir),
2077                                 _nfs4_proc_remove(dir, name),
2078                                 &exception);
2079         } while (exception.retry);
2080         return err;
2081 }
2082
2083 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2084 {
2085         struct nfs_server *server = NFS_SERVER(dir);
2086         struct nfs_removeargs *args = msg->rpc_argp;
2087         struct nfs_removeres *res = msg->rpc_resp;
2088
2089         args->bitmask = server->cache_consistency_bitmask;
2090         res->server = server;
2091         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2092 }
2093
2094 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2095 {
2096         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2097
2098         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2099                 return 0;
2100         update_changeattr(dir, &res->cinfo);
2101         nfs_post_op_update_inode(dir, &res->dir_attr);
2102         return 1;
2103 }
2104
2105 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2106                 struct inode *new_dir, struct qstr *new_name)
2107 {
2108         struct nfs_server *server = NFS_SERVER(old_dir);
2109         struct nfs4_rename_arg arg = {
2110                 .old_dir = NFS_FH(old_dir),
2111                 .new_dir = NFS_FH(new_dir),
2112                 .old_name = old_name,
2113                 .new_name = new_name,
2114                 .bitmask = server->attr_bitmask,
2115         };
2116         struct nfs_fattr old_fattr, new_fattr;
2117         struct nfs4_rename_res res = {
2118                 .server = server,
2119                 .old_fattr = &old_fattr,
2120                 .new_fattr = &new_fattr,
2121         };
2122         struct rpc_message msg = {
2123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2124                 .rpc_argp = &arg,
2125                 .rpc_resp = &res,
2126         };
2127         int                     status;
2128
2129         nfs_fattr_init(res.old_fattr);
2130         nfs_fattr_init(res.new_fattr);
2131         status = rpc_call_sync(server->client, &msg, 0);
2132
2133         if (!status) {
2134                 update_changeattr(old_dir, &res.old_cinfo);
2135                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2136                 update_changeattr(new_dir, &res.new_cinfo);
2137                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2138         }
2139         return status;
2140 }
2141
2142 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2143                 struct inode *new_dir, struct qstr *new_name)
2144 {
2145         struct nfs4_exception exception = { };
2146         int err;
2147         do {
2148                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2149                                 _nfs4_proc_rename(old_dir, old_name,
2150                                         new_dir, new_name),
2151                                 &exception);
2152         } while (exception.retry);
2153         return err;
2154 }
2155
2156 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2157 {
2158         struct nfs_server *server = NFS_SERVER(inode);
2159         struct nfs4_link_arg arg = {
2160                 .fh     = NFS_FH(inode),
2161                 .dir_fh = NFS_FH(dir),
2162                 .name   = name,
2163                 .bitmask = server->attr_bitmask,
2164         };
2165         struct nfs_fattr fattr, dir_attr;
2166         struct nfs4_link_res res = {
2167                 .server = server,
2168                 .fattr = &fattr,
2169                 .dir_attr = &dir_attr,
2170         };
2171         struct rpc_message msg = {
2172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2173                 .rpc_argp = &arg,
2174                 .rpc_resp = &res,
2175         };
2176         int                     status;
2177
2178         nfs_fattr_init(res.fattr);
2179         nfs_fattr_init(res.dir_attr);
2180         status = rpc_call_sync(server->client, &msg, 0);
2181         if (!status) {
2182                 update_changeattr(dir, &res.cinfo);
2183                 nfs_post_op_update_inode(dir, res.dir_attr);
2184                 nfs_post_op_update_inode(inode, res.fattr);
2185         }
2186
2187         return status;
2188 }
2189
2190 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2191 {
2192         struct nfs4_exception exception = { };
2193         int err;
2194         do {
2195                 err = nfs4_handle_exception(NFS_SERVER(inode),
2196                                 _nfs4_proc_link(inode, dir, name),
2197                                 &exception);
2198         } while (exception.retry);
2199         return err;
2200 }
2201
2202 struct nfs4_createdata {
2203         struct rpc_message msg;
2204         struct nfs4_create_arg arg;
2205         struct nfs4_create_res res;
2206         struct nfs_fh fh;
2207         struct nfs_fattr fattr;
2208         struct nfs_fattr dir_fattr;
2209 };
2210
2211 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2212                 struct qstr *name, struct iattr *sattr, u32 ftype)
2213 {
2214         struct nfs4_createdata *data;
2215
2216         data = kzalloc(sizeof(*data), GFP_KERNEL);
2217         if (data != NULL) {
2218                 struct nfs_server *server = NFS_SERVER(dir);
2219
2220                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2221                 data->msg.rpc_argp = &data->arg;
2222                 data->msg.rpc_resp = &data->res;
2223                 data->arg.dir_fh = NFS_FH(dir);
2224                 data->arg.server = server;
2225                 data->arg.name = name;
2226                 data->arg.attrs = sattr;
2227                 data->arg.ftype = ftype;
2228                 data->arg.bitmask = server->attr_bitmask;
2229                 data->res.server = server;
2230                 data->res.fh = &data->fh;
2231                 data->res.fattr = &data->fattr;
2232                 data->res.dir_fattr = &data->dir_fattr;
2233                 nfs_fattr_init(data->res.fattr);
2234                 nfs_fattr_init(data->res.dir_fattr);
2235         }
2236         return data;
2237 }
2238
2239 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2240 {
2241         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2242         if (status == 0) {
2243                 update_changeattr(dir, &data->res.dir_cinfo);
2244                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2245                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2246         }
2247         return status;
2248 }
2249
2250 static void nfs4_free_createdata(struct nfs4_createdata *data)
2251 {
2252         kfree(data);
2253 }
2254
2255 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2256                 struct page *page, unsigned int len, struct iattr *sattr)
2257 {
2258         struct nfs4_createdata *data;
2259         int status = -ENAMETOOLONG;
2260
2261         if (len > NFS4_MAXPATHLEN)
2262                 goto out;
2263
2264         status = -ENOMEM;
2265         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2266         if (data == NULL)
2267                 goto out;
2268
2269         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2270         data->arg.u.symlink.pages = &page;
2271         data->arg.u.symlink.len = len;
2272
2273         status = nfs4_do_create(dir, dentry, data);
2274
2275         nfs4_free_createdata(data);
2276 out:
2277         return status;
2278 }
2279
2280 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2281                 struct page *page, unsigned int len, struct iattr *sattr)
2282 {
2283         struct nfs4_exception exception = { };
2284         int err;
2285         do {
2286                 err = nfs4_handle_exception(NFS_SERVER(dir),
2287                                 _nfs4_proc_symlink(dir, dentry, page,
2288                                                         len, sattr),
2289                                 &exception);
2290         } while (exception.retry);
2291         return err;
2292 }
2293
2294 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2295                 struct iattr *sattr)
2296 {
2297         struct nfs4_createdata *data;
2298         int status = -ENOMEM;
2299
2300         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2301         if (data == NULL)
2302                 goto out;
2303
2304         status = nfs4_do_create(dir, dentry, data);
2305
2306         nfs4_free_createdata(data);
2307 out:
2308         return status;
2309 }
2310
2311 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2312                 struct iattr *sattr)
2313 {
2314         struct nfs4_exception exception = { };
2315         int err;
2316         do {
2317                 err = nfs4_handle_exception(NFS_SERVER(dir),
2318                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2319                                 &exception);
2320         } while (exception.retry);
2321         return err;
2322 }
2323
2324 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2325                   u64 cookie, struct page *page, unsigned int count, int plus)
2326 {
2327         struct inode            *dir = dentry->d_inode;
2328         struct nfs4_readdir_arg args = {
2329                 .fh = NFS_FH(dir),
2330                 .pages = &page,
2331                 .pgbase = 0,
2332                 .count = count,
2333                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2334         };
2335         struct nfs4_readdir_res res;
2336         struct rpc_message msg = {
2337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2338                 .rpc_argp = &args,
2339                 .rpc_resp = &res,
2340                 .rpc_cred = cred,
2341         };
2342         int                     status;
2343
2344         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2345                         dentry->d_parent->d_name.name,
2346                         dentry->d_name.name,
2347                         (unsigned long long)cookie);
2348         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2349         res.pgbase = args.pgbase;
2350         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2351         if (status == 0)
2352                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2353
2354         nfs_invalidate_atime(dir);
2355
2356         dprintk("%s: returns %d\n", __func__, status);
2357         return status;
2358 }
2359
2360 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2361                   u64 cookie, struct page *page, unsigned int count, int plus)
2362 {
2363         struct nfs4_exception exception = { };
2364         int err;
2365         do {
2366                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2367                                 _nfs4_proc_readdir(dentry, cred, cookie,
2368                                         page, count, plus),
2369                                 &exception);
2370         } while (exception.retry);
2371         return err;
2372 }
2373
2374 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2375                 struct iattr *sattr, dev_t rdev)
2376 {
2377         struct nfs4_createdata *data;
2378         int mode = sattr->ia_mode;
2379         int status = -ENOMEM;
2380
2381         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2382         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2383
2384         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2385         if (data == NULL)
2386                 goto out;
2387
2388         if (S_ISFIFO(mode))
2389                 data->arg.ftype = NF4FIFO;
2390         else if (S_ISBLK(mode)) {
2391                 data->arg.ftype = NF4BLK;
2392                 data->arg.u.device.specdata1 = MAJOR(rdev);
2393                 data->arg.u.device.specdata2 = MINOR(rdev);
2394         }
2395         else if (S_ISCHR(mode)) {
2396                 data->arg.ftype = NF4CHR;
2397                 data->arg.u.device.specdata1 = MAJOR(rdev);
2398                 data->arg.u.device.specdata2 = MINOR(rdev);
2399         }
2400
2401         status = nfs4_do_create(dir, dentry, data);
2402
2403         nfs4_free_createdata(data);
2404 out:
2405         return status;
2406 }
2407
2408 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2409                 struct iattr *sattr, dev_t rdev)
2410 {
2411         struct nfs4_exception exception = { };
2412         int err;
2413         do {
2414                 err = nfs4_handle_exception(NFS_SERVER(dir),
2415                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2416                                 &exception);
2417         } while (exception.retry);
2418         return err;
2419 }
2420
2421 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2422                  struct nfs_fsstat *fsstat)
2423 {
2424         struct nfs4_statfs_arg args = {
2425                 .fh = fhandle,
2426                 .bitmask = server->attr_bitmask,
2427         };
2428         struct rpc_message msg = {
2429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2430                 .rpc_argp = &args,
2431                 .rpc_resp = fsstat,
2432         };
2433
2434         nfs_fattr_init(fsstat->fattr);
2435         return rpc_call_sync(server->client, &msg, 0);
2436 }
2437
2438 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2439 {
2440         struct nfs4_exception exception = { };
2441         int err;
2442         do {
2443                 err = nfs4_handle_exception(server,
2444                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2445                                 &exception);
2446         } while (exception.retry);
2447         return err;
2448 }
2449
2450 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2451                 struct nfs_fsinfo *fsinfo)
2452 {
2453         struct nfs4_fsinfo_arg args = {
2454                 .fh = fhandle,
2455                 .bitmask = server->attr_bitmask,
2456         };
2457         struct rpc_message msg = {
2458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2459                 .rpc_argp = &args,
2460                 .rpc_resp = fsinfo,
2461         };
2462
2463         return rpc_call_sync(server->client, &msg, 0);
2464 }
2465
2466 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2467 {
2468         struct nfs4_exception exception = { };
2469         int err;
2470
2471         do {
2472                 err = nfs4_handle_exception(server,
2473                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2474                                 &exception);
2475         } while (exception.retry);
2476         return err;
2477 }
2478
2479 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2480 {
2481         nfs_fattr_init(fsinfo->fattr);
2482         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2483 }
2484
2485 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2486                 struct nfs_pathconf *pathconf)
2487 {
2488         struct nfs4_pathconf_arg args = {
2489                 .fh = fhandle,
2490                 .bitmask = server->attr_bitmask,
2491         };
2492         struct rpc_message msg = {
2493                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2494                 .rpc_argp = &args,
2495                 .rpc_resp = pathconf,
2496         };
2497
2498         /* None of the pathconf attributes are mandatory to implement */
2499         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2500                 memset(pathconf, 0, sizeof(*pathconf));
2501                 return 0;
2502         }
2503
2504         nfs_fattr_init(pathconf->fattr);
2505         return rpc_call_sync(server->client, &msg, 0);
2506 }
2507
2508 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2509                 struct nfs_pathconf *pathconf)
2510 {
2511         struct nfs4_exception exception = { };
2512         int err;
2513
2514         do {
2515                 err = nfs4_handle_exception(server,
2516                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2517                                 &exception);
2518         } while (exception.retry);
2519         return err;
2520 }
2521
2522 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2523 {
2524         struct nfs_server *server = NFS_SERVER(data->inode);
2525
2526         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2527                 rpc_restart_call(task);
2528                 return -EAGAIN;
2529         }
2530
2531         nfs_invalidate_atime(data->inode);
2532         if (task->tk_status > 0)
2533                 renew_lease(server, data->timestamp);
2534         return 0;
2535 }
2536
2537 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2538 {
2539         data->timestamp   = jiffies;
2540         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2541 }
2542
2543 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2544 {
2545         struct inode *inode = data->inode;
2546
2547         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2548                 rpc_restart_call(task);
2549                 return -EAGAIN;
2550         }
2551         if (task->tk_status >= 0) {
2552                 renew_lease(NFS_SERVER(inode), data->timestamp);
2553                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2554         }
2555         return 0;
2556 }
2557
2558 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2559 {
2560         struct nfs_server *server = NFS_SERVER(data->inode);
2561
2562         data->args.bitmask = server->cache_consistency_bitmask;
2563         data->res.server = server;
2564         data->timestamp   = jiffies;
2565
2566         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2567 }
2568
2569 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2570 {
2571         struct inode *inode = data->inode;
2572
2573         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2574                 rpc_restart_call(task);
2575                 return -EAGAIN;
2576         }
2577         nfs_refresh_inode(inode, data->res.fattr);
2578         return 0;
2579 }
2580
2581 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2582 {
2583         struct nfs_server *server = NFS_SERVER(data->inode);
2584
2585         data->args.bitmask = server->cache_consistency_bitmask;
2586         data->res.server = server;
2587         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2588 }
2589
2590 /*
2591  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2592  * standalone procedure for queueing an asynchronous RENEW.
2593  */
2594 static void nfs4_renew_done(struct rpc_task *task, void *data)
2595 {
2596         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2597         unsigned long timestamp = (unsigned long)data;
2598
2599         if (task->tk_status < 0) {
2600                 /* Unless we're shutting down, schedule state recovery! */
2601                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
2602                         nfs4_schedule_state_recovery(clp);
2603                 return;
2604         }
2605         spin_lock(&clp->cl_lock);
2606         if (time_before(clp->cl_last_renewal,timestamp))
2607                 clp->cl_last_renewal = timestamp;
2608         spin_unlock(&clp->cl_lock);
2609 }
2610
2611 static const struct rpc_call_ops nfs4_renew_ops = {
2612         .rpc_call_done = nfs4_renew_done,
2613 };
2614
2615 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2616 {
2617         struct rpc_message msg = {
2618                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2619                 .rpc_argp       = clp,
2620                 .rpc_cred       = cred,
2621         };
2622
2623         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2624                         &nfs4_renew_ops, (void *)jiffies);
2625 }
2626
2627 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2628 {
2629         struct rpc_message msg = {
2630                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2631                 .rpc_argp       = clp,
2632                 .rpc_cred       = cred,
2633         };
2634         unsigned long now = jiffies;
2635         int status;
2636
2637         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2638         if (status < 0)
2639                 return status;
2640         spin_lock(&clp->cl_lock);
2641         if (time_before(clp->cl_last_renewal,now))
2642                 clp->cl_last_renewal = now;
2643         spin_unlock(&clp->cl_lock);
2644         return 0;
2645 }
2646
2647 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2648 {
2649         return (server->caps & NFS_CAP_ACLS)
2650                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2651                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2652 }
2653
2654 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2655  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2656  * the stack.
2657  */
2658 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2659
2660 static void buf_to_pages(const void *buf, size_t buflen,
2661                 struct page **pages, unsigned int *pgbase)
2662 {
2663         const void *p = buf;
2664
2665         *pgbase = offset_in_page(buf);
2666         p -= *pgbase;
2667         while (p < buf + buflen) {
2668                 *(pages++) = virt_to_page(p);
2669                 p += PAGE_CACHE_SIZE;
2670         }
2671 }
2672
2673 struct nfs4_cached_acl {
2674         int cached;
2675         size_t len;
2676         char data[0];
2677 };
2678
2679 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2680 {
2681         struct nfs_inode *nfsi = NFS_I(inode);
2682
2683         spin_lock(&inode->i_lock);
2684         kfree(nfsi->nfs4_acl);
2685         nfsi->nfs4_acl = acl;
2686         spin_unlock(&inode->i_lock);
2687 }
2688
2689 static void nfs4_zap_acl_attr(struct inode *inode)
2690 {
2691         nfs4_set_cached_acl(inode, NULL);
2692 }
2693
2694 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2695 {
2696         struct nfs_inode *nfsi = NFS_I(inode);
2697         struct nfs4_cached_acl *acl;
2698         int ret = -ENOENT;
2699
2700         spin_lock(&inode->i_lock);
2701         acl = nfsi->nfs4_acl;
2702         if (acl == NULL)
2703                 goto out;
2704         if (buf == NULL) /* user is just asking for length */
2705                 goto out_len;
2706         if (acl->cached == 0)
2707                 goto out;
2708         ret = -ERANGE; /* see getxattr(2) man page */
2709         if (acl->len > buflen)
2710                 goto out;
2711         memcpy(buf, acl->data, acl->len);
2712 out_len:
2713         ret = acl->len;
2714 out:
2715         spin_unlock(&inode->i_lock);
2716         return ret;
2717 }
2718
2719 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2720 {
2721         struct nfs4_cached_acl *acl;
2722
2723         if (buf && acl_len <= PAGE_SIZE) {
2724                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2725                 if (acl == NULL)
2726                         goto out;
2727                 acl->cached = 1;
2728                 memcpy(acl->data, buf, acl_len);
2729         } else {
2730                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2731                 if (acl == NULL)
2732                         goto out;
2733                 acl->cached = 0;
2734         }
2735         acl->len = acl_len;
2736 out:
2737         nfs4_set_cached_acl(inode, acl);
2738 }
2739
2740 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2741 {
2742         struct page *pages[NFS4ACL_MAXPAGES];
2743         struct nfs_getaclargs args = {
2744                 .fh = NFS_FH(inode),
2745                 .acl_pages = pages,
2746                 .acl_len = buflen,
2747         };
2748         size_t resp_len = buflen;
2749         void *resp_buf;
2750         struct rpc_message msg = {
2751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2752                 .rpc_argp = &args,
2753                 .rpc_resp = &resp_len,
2754         };
2755         struct page *localpage = NULL;
2756         int ret;
2757
2758         if (buflen < PAGE_SIZE) {
2759                 /* As long as we're doing a round trip to the server anyway,
2760                  * let's be prepared for a page of acl data. */
2761                 localpage = alloc_page(GFP_KERNEL);
2762                 resp_buf = page_address(localpage);
2763                 if (localpage == NULL)
2764                         return -ENOMEM;
2765                 args.acl_pages[0] = localpage;
2766                 args.acl_pgbase = 0;
2767                 resp_len = args.acl_len = PAGE_SIZE;
2768         } else {
2769                 resp_buf = buf;
2770                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2771         }
2772         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2773         if (ret)
2774                 goto out_free;
2775         if (resp_len > args.acl_len)
2776                 nfs4_write_cached_acl(inode, NULL, resp_len);
2777         else
2778                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2779         if (buf) {
2780                 ret = -ERANGE;
2781                 if (resp_len > buflen)
2782                         goto out_free;
2783                 if (localpage)
2784                         memcpy(buf, resp_buf, resp_len);
2785         }
2786         ret = resp_len;
2787 out_free:
2788         if (localpage)
2789                 __free_page(localpage);
2790         return ret;
2791 }
2792
2793 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2794 {
2795         struct nfs4_exception exception = { };
2796         ssize_t ret;
2797         do {
2798                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2799                 if (ret >= 0)
2800                         break;
2801                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2802         } while (exception.retry);
2803         return ret;
2804 }
2805
2806 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2807 {
2808         struct nfs_server *server = NFS_SERVER(inode);
2809         int ret;
2810
2811         if (!nfs4_server_supports_acls(server))
2812                 return -EOPNOTSUPP;
2813         ret = nfs_revalidate_inode(server, inode);
2814         if (ret < 0)
2815                 return ret;
2816         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2817                 nfs_zap_acl_cache(inode);
2818         ret = nfs4_read_cached_acl(inode, buf, buflen);
2819         if (ret != -ENOENT)
2820                 return ret;
2821         return nfs4_get_acl_uncached(inode, buf, buflen);
2822 }
2823
2824 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2825 {
2826         struct nfs_server *server = NFS_SERVER(inode);
2827         struct page *pages[NFS4ACL_MAXPAGES];
2828         struct nfs_setaclargs arg = {
2829                 .fh             = NFS_FH(inode),
2830                 .acl_pages      = pages,
2831                 .acl_len        = buflen,
2832         };
2833         struct rpc_message msg = {
2834                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2835                 .rpc_argp       = &arg,
2836                 .rpc_resp       = NULL,
2837         };
2838         int ret;
2839
2840         if (!nfs4_server_supports_acls(server))
2841                 return -EOPNOTSUPP;
2842         nfs_inode_return_delegation(inode);
2843         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2844         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2845         nfs_access_zap_cache(inode);
2846         nfs_zap_acl_cache(inode);
2847         return ret;
2848 }
2849
2850 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2851 {
2852         struct nfs4_exception exception = { };
2853         int err;
2854         do {
2855                 err = nfs4_handle_exception(NFS_SERVER(inode),
2856                                 __nfs4_proc_set_acl(inode, buf, buflen),
2857                                 &exception);
2858         } while (exception.retry);
2859         return err;
2860 }
2861
2862 static int
2863 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2864 {
2865         struct nfs_client *clp = server->nfs_client;
2866
2867         if (!clp || task->tk_status >= 0)
2868                 return 0;
2869         switch(task->tk_status) {
2870                 case -NFS4ERR_ADMIN_REVOKED:
2871                 case -NFS4ERR_BAD_STATEID:
2872                 case -NFS4ERR_OPENMODE:
2873                         if (state == NULL)
2874                                 break;
2875                         nfs4_state_mark_reclaim_nograce(clp, state);
2876                 case -NFS4ERR_STALE_CLIENTID:
2877                 case -NFS4ERR_STALE_STATEID:
2878                 case -NFS4ERR_EXPIRED:
2879                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2880                         nfs4_schedule_state_recovery(clp);
2881                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2882                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2883                         task->tk_status = 0;
2884                         return -EAGAIN;
2885                 case -NFS4ERR_DELAY:
2886                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2887                 case -NFS4ERR_GRACE:
2888                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2889                         task->tk_status = 0;
2890                         return -EAGAIN;
2891                 case -NFS4ERR_OLD_STATEID:
2892                         task->tk_status = 0;
2893                         return -EAGAIN;
2894         }
2895         task->tk_status = nfs4_map_errors(task->tk_status);
2896         return 0;
2897 }
2898
2899 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2900 {
2901         nfs4_verifier sc_verifier;
2902         struct nfs4_setclientid setclientid = {
2903                 .sc_verifier = &sc_verifier,
2904                 .sc_prog = program,
2905         };
2906         struct rpc_message msg = {
2907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2908                 .rpc_argp = &setclientid,
2909                 .rpc_resp = clp,
2910                 .rpc_cred = cred,
2911         };
2912         __be32 *p;
2913         int loop = 0;
2914         int status;
2915
2916         p = (__be32*)sc_verifier.data;
2917         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2918         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2919
2920         for(;;) {
2921                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2922                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2923                                 clp->cl_ipaddr,
2924                                 rpc_peeraddr2str(clp->cl_rpcclient,
2925                                                         RPC_DISPLAY_ADDR),
2926                                 rpc_peeraddr2str(clp->cl_rpcclient,
2927                                                         RPC_DISPLAY_PROTO),
2928                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2929                                 clp->cl_id_uniquifier);
2930                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2931                                 sizeof(setclientid.sc_netid),
2932                                 rpc_peeraddr2str(clp->cl_rpcclient,
2933                                                         RPC_DISPLAY_NETID));
2934                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2935                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2936                                 clp->cl_ipaddr, port >> 8, port & 255);
2937
2938                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2939                 if (status != -NFS4ERR_CLID_INUSE)
2940                         break;
2941                 if (signalled())
2942                         break;
2943                 if (loop++ & 1)
2944                         ssleep(clp->cl_lease_time + 1);
2945                 else
2946                         if (++clp->cl_id_uniquifier == 0)
2947                                 break;
2948         }
2949         return status;
2950 }
2951
2952 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2953 {
2954         struct nfs_fsinfo fsinfo;
2955         struct rpc_message msg = {
2956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2957                 .rpc_argp = clp,
2958                 .rpc_resp = &fsinfo,
2959                 .rpc_cred = cred,
2960         };
2961         unsigned long now;
2962         int status;
2963
2964         now = jiffies;
2965         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2966         if (status == 0) {
2967                 spin_lock(&clp->cl_lock);
2968                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2969                 clp->cl_last_renewal = now;
2970                 spin_unlock(&clp->cl_lock);
2971         }
2972         return status;
2973 }
2974
2975 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2976 {
2977         long timeout = 0;
2978         int err;
2979         do {
2980                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2981                 switch (err) {
2982                         case 0:
2983                                 return err;
2984                         case -NFS4ERR_RESOURCE:
2985                                 /* The IBM lawyers misread another document! */
2986                         case -NFS4ERR_DELAY:
2987                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2988                 }
2989         } while (err == 0);
2990         return err;
2991 }
2992
2993 struct nfs4_delegreturndata {
2994         struct nfs4_delegreturnargs args;
2995         struct nfs4_delegreturnres res;
2996         struct nfs_fh fh;
2997         nfs4_stateid stateid;
2998         unsigned long timestamp;
2999         struct nfs_fattr fattr;
3000         int rpc_status;
3001 };
3002
3003 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3004 {
3005         struct nfs4_delegreturndata *data = calldata;
3006         data->rpc_status = task->tk_status;
3007         if (data->rpc_status == 0)
3008                 renew_lease(data->res.server, data->timestamp);
3009 }
3010
3011 static void nfs4_delegreturn_release(void *calldata)
3012 {
3013         kfree(calldata);
3014 }
3015
3016 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3017         .rpc_call_done = nfs4_delegreturn_done,
3018         .rpc_release = nfs4_delegreturn_release,
3019 };
3020
3021 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3022 {
3023         struct nfs4_delegreturndata *data;
3024         struct nfs_server *server = NFS_SERVER(inode);
3025         struct rpc_task *task;
3026         struct rpc_message msg = {
3027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3028                 .rpc_cred = cred,
3029         };
3030         struct rpc_task_setup task_setup_data = {
3031                 .rpc_client = server->client,
3032                 .rpc_message = &msg,
3033                 .callback_ops = &nfs4_delegreturn_ops,
3034                 .flags = RPC_TASK_ASYNC,
3035         };
3036         int status = 0;
3037
3038         data = kmalloc(sizeof(*data), GFP_KERNEL);
3039         if (data == NULL)
3040                 return -ENOMEM;
3041         data->args.fhandle = &data->fh;
3042         data->args.stateid = &data->stateid;
3043         data->args.bitmask = server->attr_bitmask;
3044         nfs_copy_fh(&data->fh, NFS_FH(inode));
3045         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3046         data->res.fattr = &data->fattr;
3047         data->res.server = server;
3048         nfs_fattr_init(data->res.fattr);
3049         data->timestamp = jiffies;
3050         data->rpc_status = 0;
3051
3052         task_setup_data.callback_data = data;
3053         msg.rpc_argp = &data->args,
3054         msg.rpc_resp = &data->res,
3055         task = rpc_run_task(&task_setup_data);
3056         if (IS_ERR(task))
3057                 return PTR_ERR(task);
3058         if (!issync)
3059                 goto out;
3060         status = nfs4_wait_for_completion_rpc_task(task);
3061         if (status != 0)
3062                 goto out;
3063         status = data->rpc_status;
3064         if (status != 0)
3065                 goto out;
3066         nfs_refresh_inode(inode, &data->fattr);
3067 out:
3068         rpc_put_task(task);
3069         return status;
3070 }
3071
3072 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3073 {
3074         struct nfs_server *server = NFS_SERVER(inode);
3075         struct nfs4_exception exception = { };
3076         int err;
3077         do {
3078                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3079                 switch (err) {
3080                         case -NFS4ERR_STALE_STATEID:
3081                         case -NFS4ERR_EXPIRED:
3082                         case 0:
3083                                 return 0;
3084                 }
3085                 err = nfs4_handle_exception(server, err, &exception);
3086         } while (exception.retry);
3087         return err;
3088 }
3089
3090 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3091 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3092
3093 /*
3094  * sleep, with exponential backoff, and retry the LOCK operation.
3095  */
3096 static unsigned long
3097 nfs4_set_lock_task_retry(unsigned long timeout)
3098 {
3099         schedule_timeout_killable(timeout);
3100         timeout <<= 1;
3101         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3102                 return NFS4_LOCK_MAXTIMEOUT;
3103         return timeout;
3104 }
3105
3106 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3107 {
3108         struct inode *inode = state->inode;
3109         struct nfs_server *server = NFS_SERVER(inode);
3110         struct nfs_client *clp = server->nfs_client;
3111         struct nfs_lockt_args arg = {
3112                 .fh = NFS_FH(inode),
3113                 .fl = request,
3114         };
3115         struct nfs_lockt_res res = {
3116                 .denied = request,
3117         };
3118         struct rpc_message msg = {
3119                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3120                 .rpc_argp       = &arg,
3121                 .rpc_resp       = &res,
3122                 .rpc_cred       = state->owner->so_cred,
3123         };
3124         struct nfs4_lock_state *lsp;
3125         int status;
3126
3127         arg.lock_owner.clientid = clp->cl_clientid;
3128         status = nfs4_set_lock_state(state, request);
3129         if (status != 0)
3130                 goto out;
3131         lsp = request->fl_u.nfs4_fl.owner;
3132         arg.lock_owner.id = lsp->ls_id.id;
3133         status = rpc_call_sync(server->client, &msg, 0);
3134         switch (status) {
3135                 case 0:
3136                         request->fl_type = F_UNLCK;
3137                         break;
3138                 case -NFS4ERR_DENIED:
3139                         status = 0;
3140         }
3141         request->fl_ops->fl_release_private(request);
3142 out:
3143         return status;
3144 }
3145
3146 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3147 {
3148         struct nfs4_exception exception = { };
3149         int err;
3150
3151         do {
3152                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3153                                 _nfs4_proc_getlk(state, cmd, request),
3154                                 &exception);
3155         } while (exception.retry);
3156         return err;
3157 }
3158
3159 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3160 {
3161         int res = 0;
3162         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3163                 case FL_POSIX:
3164                         res = posix_lock_file_wait(file, fl);
3165                         break;
3166                 case FL_FLOCK:
3167                         res = flock_lock_file_wait(file, fl);
3168                         break;
3169                 default:
3170                         BUG();
3171         }
3172         return res;
3173 }
3174
3175 struct nfs4_unlockdata {
3176         struct nfs_locku_args arg;
3177         struct nfs_locku_res res;
3178         struct nfs4_lock_state *lsp;
3179         struct nfs_open_context *ctx;
3180         struct file_lock fl;
3181         const struct nfs_server *server;
3182         unsigned long timestamp;
3183 };
3184
3185 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3186                 struct nfs_open_context *ctx,
3187                 struct nfs4_lock_state *lsp,
3188                 struct nfs_seqid *seqid)
3189 {
3190         struct nfs4_unlockdata *p;
3191         struct inode *inode = lsp->ls_state->inode;
3192
3193         p = kmalloc(sizeof(*p), GFP_KERNEL);
3194         if (p == NULL)
3195                 return NULL;
3196         p->arg.fh = NFS_FH(inode);
3197         p->arg.fl = &p->fl;
3198         p->arg.seqid = seqid;
3199         p->res.seqid = seqid;
3200         p->arg.stateid = &lsp->ls_stateid;
3201         p->lsp = lsp;
3202         atomic_inc(&lsp->ls_count);
3203         /* Ensure we don't close file until we're done freeing locks! */
3204         p->ctx = get_nfs_open_context(ctx);
3205         memcpy(&p->fl, fl, sizeof(p->fl));
3206         p->server = NFS_SERVER(inode);
3207         return p;
3208 }
3209
3210 static void nfs4_locku_release_calldata(void *data)
3211 {
3212         struct nfs4_unlockdata *calldata = data;
3213         nfs_free_seqid(calldata->arg.seqid);
3214         nfs4_put_lock_state(calldata->lsp);
3215         put_nfs_open_context(calldata->ctx);
3216         kfree(calldata);
3217 }
3218
3219 static void nfs4_locku_done(struct rpc_task *task, void *data)
3220 {
3221         struct nfs4_unlockdata *calldata = data;
3222
3223         if (RPC_ASSASSINATED(task))
3224                 return;
3225         switch (task->tk_status) {
3226                 case 0:
3227                         memcpy(calldata->lsp->ls_stateid.data,
3228                                         calldata->res.stateid.data,
3229                                         sizeof(calldata->lsp->ls_stateid.data));
3230                         renew_lease(calldata->server, calldata->timestamp);
3231                         break;
3232                 case -NFS4ERR_BAD_STATEID:
3233                 case -NFS4ERR_OLD_STATEID:
3234                 case -NFS4ERR_STALE_STATEID:
3235                 case -NFS4ERR_EXPIRED:
3236                         break;
3237                 default:
3238                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3239                                 rpc_restart_call(task);
3240         }
3241 }
3242
3243 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3244 {
3245         struct nfs4_unlockdata *calldata = data;
3246
3247         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3248                 return;
3249         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3250                 /* Note: exit _without_ running nfs4_locku_done */
3251                 task->tk_action = NULL;
3252                 return;
3253         }
3254         calldata->timestamp = jiffies;
3255         rpc_call_start(task);
3256 }
3257
3258 static const struct rpc_call_ops nfs4_locku_ops = {
3259         .rpc_call_prepare = nfs4_locku_prepare,
3260         .rpc_call_done = nfs4_locku_done,
3261         .rpc_release = nfs4_locku_release_calldata,
3262 };
3263
3264 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3265                 struct nfs_open_context *ctx,
3266                 struct nfs4_lock_state *lsp,
3267                 struct nfs_seqid *seqid)
3268 {
3269         struct nfs4_unlockdata *data;
3270         struct rpc_message msg = {
3271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3272                 .rpc_cred = ctx->cred,
3273         };
3274         struct rpc_task_setup task_setup_data = {
3275                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3276                 .rpc_message = &msg,
3277                 .callback_ops = &nfs4_locku_ops,
3278                 .workqueue = nfsiod_workqueue,
3279                 .flags = RPC_TASK_ASYNC,
3280         };
3281
3282         /* Ensure this is an unlock - when canceling a lock, the
3283          * canceled lock is passed in, and it won't be an unlock.
3284          */
3285         fl->fl_type = F_UNLCK;
3286
3287         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3288         if (data == NULL) {
3289                 nfs_free_seqid(seqid);
3290                 return ERR_PTR(-ENOMEM);
3291         }
3292
3293         msg.rpc_argp = &data->arg,
3294         msg.rpc_resp = &data->res,
3295         task_setup_data.callback_data = data;
3296         return rpc_run_task(&task_setup_data);
3297 }
3298
3299 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3300 {
3301         struct nfs_inode *nfsi = NFS_I(state->inode);
3302         struct nfs_seqid *seqid;
3303         struct nfs4_lock_state *lsp;
3304         struct rpc_task *task;
3305         int status = 0;
3306         unsigned char fl_flags = request->fl_flags;
3307
3308         status = nfs4_set_lock_state(state, request);
3309         /* Unlock _before_ we do the RPC call */
3310         request->fl_flags |= FL_EXISTS;
3311         down_read(&nfsi->rwsem);
3312         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3313                 up_read(&nfsi->rwsem);
3314                 goto out;
3315         }
3316         up_read(&nfsi->rwsem);
3317         if (status != 0)
3318                 goto out;
3319         /* Is this a delegated lock? */
3320         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3321                 goto out;
3322         lsp = request->fl_u.nfs4_fl.owner;
3323         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3324         status = -ENOMEM;
3325         if (seqid == NULL)
3326                 goto out;
3327         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3328         status = PTR_ERR(task);
3329         if (IS_ERR(task))
3330                 goto out;
3331         status = nfs4_wait_for_completion_rpc_task(task);
3332         rpc_put_task(task);
3333 out:
3334         request->fl_flags = fl_flags;
3335         return status;
3336 }
3337
3338 struct nfs4_lockdata {
3339         struct nfs_lock_args arg;
3340         struct nfs_lock_res res;
3341         struct nfs4_lock_state *lsp;
3342         struct nfs_open_context *ctx;
3343         struct file_lock fl;
3344         unsigned long timestamp;
3345         int rpc_status;
3346         int cancelled;
3347 };
3348
3349 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3350                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3351 {
3352         struct nfs4_lockdata *p;
3353         struct inode *inode = lsp->ls_state->inode;
3354         struct nfs_server *server = NFS_SERVER(inode);
3355
3356         p = kzalloc(sizeof(*p), GFP_KERNEL);
3357         if (p == NULL)
3358                 return NULL;
3359
3360         p->arg.fh = NFS_FH(inode);
3361         p->arg.fl = &p->fl;
3362         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3363         if (p->arg.open_seqid == NULL)
3364                 goto out_free;
3365         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3366         if (p->arg.lock_seqid == NULL)
3367                 goto out_free_seqid;
3368         p->arg.lock_stateid = &lsp->ls_stateid;
3369         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3370         p->arg.lock_owner.id = lsp->ls_id.id;
3371         p->res.lock_seqid = p->arg.lock_seqid;
3372         p->lsp = lsp;
3373         atomic_inc(&lsp->ls_count);
3374         p->ctx = get_nfs_open_context(ctx);
3375         memcpy(&p->fl, fl, sizeof(p->fl));
3376         return p;
3377 out_free_seqid:
3378         nfs_free_seqid(p->arg.open_seqid);
3379 out_free:
3380         kfree(p);
3381         return NULL;
3382 }
3383
3384 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3385 {
3386         struct nfs4_lockdata *data = calldata;
3387         struct nfs4_state *state = data->lsp->ls_state;
3388
3389         dprintk("%s: begin!\n", __func__);
3390         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3391                 return;
3392         /* Do we need to do an open_to_lock_owner? */
3393         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3394                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3395                         return;
3396                 data->arg.open_stateid = &state->stateid;
3397                 data->arg.new_lock_owner = 1;
3398                 data->res.open_seqid = data->arg.open_seqid;
3399         } else
3400                 data->arg.new_lock_owner = 0;
3401         data->timestamp = jiffies;
3402         rpc_call_start(task);
3403         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3404 }
3405
3406 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3407 {
3408         struct nfs4_lockdata *data = calldata;
3409
3410         dprintk("%s: begin!\n", __func__);
3411
3412         data->rpc_status = task->tk_status;
3413         if (RPC_ASSASSINATED(task))
3414                 goto out;
3415         if (data->arg.new_lock_owner != 0) {
3416                 if (data->rpc_status == 0)
3417                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3418                 else
3419                         goto out;
3420         }
3421         if (data->rpc_status == 0) {
3422                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3423                                         sizeof(data->lsp->ls_stateid.data));
3424                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3425                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3426         }
3427 out:
3428         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3429 }
3430
3431 static void nfs4_lock_release(void *calldata)
3432 {
3433         struct nfs4_lockdata *data = calldata;
3434
3435         dprintk("%s: begin!\n", __func__);
3436         nfs_free_seqid(data->arg.open_seqid);
3437         if (data->cancelled != 0) {
3438                 struct rpc_task *task;
3439                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3440                                 data->arg.lock_seqid);
3441                 if (!IS_ERR(task))
3442                         rpc_put_task(task);
3443                 dprintk("%s: cancelling lock!\n", __func__);
3444         } else
3445                 nfs_free_seqid(data->arg.lock_seqid);
3446         nfs4_put_lock_state(data->lsp);
3447         put_nfs_open_context(data->ctx);
3448         kfree(data);
3449         dprintk("%s: done!\n", __func__);
3450 }
3451
3452 static const struct rpc_call_ops nfs4_lock_ops = {
3453         .rpc_call_prepare = nfs4_lock_prepare,
3454         .rpc_call_done = nfs4_lock_done,
3455         .rpc_release = nfs4_lock_release,
3456 };
3457
3458 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3459 {
3460         struct nfs4_lockdata *data;
3461         struct rpc_task *task;
3462         struct rpc_message msg = {
3463                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3464                 .rpc_cred = state->owner->so_cred,
3465         };
3466         struct rpc_task_setup task_setup_data = {
3467                 .rpc_client = NFS_CLIENT(state->inode),
3468                 .rpc_message = &msg,
3469                 .callback_ops = &nfs4_lock_ops,
3470                 .workqueue = nfsiod_workqueue,
3471                 .flags = RPC_TASK_ASYNC,
3472         };
3473         int ret;
3474
3475         dprintk("%s: begin!\n", __func__);
3476         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3477                         fl->fl_u.nfs4_fl.owner);
3478         if (data == NULL)
3479                 return -ENOMEM;
3480         if (IS_SETLKW(cmd))
3481                 data->arg.block = 1;
3482         if (reclaim != 0)
3483                 data->arg.reclaim = 1;
3484         msg.rpc_argp = &data->arg,
3485         msg.rpc_resp = &data->res,
3486         task_setup_data.callback_data = data;
3487         task = rpc_run_task(&task_setup_data);
3488         if (IS_ERR(task))
3489                 return PTR_ERR(task);
3490         ret = nfs4_wait_for_completion_rpc_task(task);
3491         if (ret == 0) {
3492                 ret = data->rpc_status;
3493                 if (ret == -NFS4ERR_DENIED)
3494                         ret = -EAGAIN;
3495         } else
3496                 data->cancelled = 1;
3497         rpc_put_task(task);
3498         dprintk("%s: done, ret = %d!\n", __func__, ret);
3499         return ret;
3500 }
3501
3502 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3503 {
3504         struct nfs_server *server = NFS_SERVER(state->inode);
3505         struct nfs4_exception exception = { };
3506         int err;
3507
3508         do {
3509                 /* Cache the lock if possible... */
3510                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3511                         return 0;
3512                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3513                 if (err != -NFS4ERR_DELAY)
3514                         break;
3515                 nfs4_handle_exception(server, err, &exception);
3516         } while (exception.retry);
3517         return err;
3518 }
3519
3520 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3521 {
3522         struct nfs_server *server = NFS_SERVER(state->inode);
3523         struct nfs4_exception exception = { };
3524         int err;
3525
3526         err = nfs4_set_lock_state(state, request);
3527         if (err != 0)
3528                 return err;
3529         do {
3530                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3531                         return 0;
3532                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3533                 if (err != -NFS4ERR_DELAY)
3534                         break;
3535                 nfs4_handle_exception(server, err, &exception);
3536         } while (exception.retry);
3537         return err;
3538 }
3539
3540 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3541 {
3542         struct nfs_inode *nfsi = NFS_I(state->inode);
3543         unsigned char fl_flags = request->fl_flags;
3544         int status;
3545
3546         /* Is this a delegated open? */
3547         status = nfs4_set_lock_state(state, request);
3548         if (status != 0)
3549                 goto out;
3550         request->fl_flags |= FL_ACCESS;
3551         status = do_vfs_lock(request->fl_file, request);
3552         if (status < 0)
3553                 goto out;
3554         down_read(&nfsi->rwsem);
3555         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3556                 /* Yes: cache locks! */
3557                 /* ...but avoid races with delegation recall... */
3558                 request->fl_flags = fl_flags & ~FL_SLEEP;
3559                 status = do_vfs_lock(request->fl_file, request);
3560                 goto out_unlock;
3561         }
3562         status = _nfs4_do_setlk(state, cmd, request, 0);
3563         if (status != 0)
3564                 goto out_unlock;
3565         /* Note: we always want to sleep here! */
3566         request->fl_flags = fl_flags | FL_SLEEP;
3567         if (do_vfs_lock(request->fl_file, request) < 0)
3568                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3569 out_unlock:
3570         up_read(&nfsi->rwsem);
3571 out:
3572         request->fl_flags = fl_flags;
3573         return status;
3574 }
3575
3576 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3577 {
3578         struct nfs4_exception exception = { };
3579         int err;
3580
3581         do {
3582                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3583                                 _nfs4_proc_setlk(state, cmd, request),
3584                                 &exception);
3585         } while (exception.retry);
3586         return err;
3587 }
3588
3589 static int
3590 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3591 {
3592         struct nfs_open_context *ctx;
3593         struct nfs4_state *state;
3594         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3595         int status;
3596
3597         /* verify open state */
3598         ctx = nfs_file_open_context(filp);
3599         state = ctx->state;
3600
3601         if (request->fl_start < 0 || request->fl_end < 0)
3602                 return -EINVAL;
3603
3604         if (IS_GETLK(cmd))
3605                 return nfs4_proc_getlk(state, F_GETLK, request);
3606
3607         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3608                 return -EINVAL;
3609
3610         if (request->fl_type == F_UNLCK)
3611                 return nfs4_proc_unlck(state, cmd, request);
3612
3613         do {
3614                 status = nfs4_proc_setlk(state, cmd, request);
3615                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3616                         break;
3617                 timeout = nfs4_set_lock_task_retry(timeout);
3618                 status = -ERESTARTSYS;
3619                 if (signalled())
3620                         break;
3621         } while(status < 0);
3622         return status;
3623 }
3624
3625 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3626 {
3627         struct nfs_server *server = NFS_SERVER(state->inode);
3628         struct nfs4_exception exception = { };
3629         int err;
3630
3631         err = nfs4_set_lock_state(state, fl);
3632         if (err != 0)
3633                 goto out;
3634         do {
3635                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3636                 if (err != -NFS4ERR_DELAY)
3637                         break;
3638                 err = nfs4_handle_exception(server, err, &exception);
3639         } while (exception.retry);
3640 out:
3641         return err;
3642 }
3643
3644 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3645
3646 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3647                 size_t buflen, int flags)
3648 {
3649         struct inode *inode = dentry->d_inode;
3650
3651         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3652                 return -EOPNOTSUPP;
3653
3654         return nfs4_proc_set_acl(inode, buf, buflen);
3655 }
3656
3657 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3658  * and that's what we'll do for e.g. user attributes that haven't been set.
3659  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3660  * attributes in kernel-managed attribute namespaces. */
3661 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3662                 size_t buflen)
3663 {
3664         struct inode *inode = dentry->d_inode;
3665
3666         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3667                 return -EOPNOTSUPP;
3668
3669         return nfs4_proc_get_acl(inode, buf, buflen);
3670 }
3671
3672 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3673 {
3674         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3675
3676         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3677                 return 0;
3678         if (buf && buflen < len)
3679                 return -ERANGE;
3680         if (buf)
3681                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3682         return len;
3683 }
3684
3685 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
3686 {
3687         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
3688                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
3689                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
3690                 return;
3691
3692         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3693                 NFS_ATTR_FATTR_NLINK;
3694         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3695         fattr->nlink = 2;
3696 }
3697
3698 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3699                 struct nfs4_fs_locations *fs_locations, struct page *page)
3700 {
3701         struct nfs_server *server = NFS_SERVER(dir);
3702         u32 bitmask[2] = {
3703                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3704                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3705         };
3706         struct nfs4_fs_locations_arg args = {
3707                 .dir_fh = NFS_FH(dir),
3708                 .name = name,
3709                 .page = page,
3710                 .bitmask = bitmask,
3711         };
3712         struct rpc_message msg = {
3713                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3714                 .rpc_argp = &args,
3715                 .rpc_resp = fs_locations,
3716         };
3717         int status;
3718
3719         dprintk("%s: start\n", __func__);
3720         nfs_fattr_init(&fs_locations->fattr);
3721         fs_locations->server = server;
3722         fs_locations->nlocations = 0;
3723         status = rpc_call_sync(server->client, &msg, 0);
3724         nfs_fixup_referral_attributes(&fs_locations->fattr);
3725         dprintk("%s: returned status = %d\n", __func__, status);
3726         return status;
3727 }
3728
3729 #ifdef CONFIG_NFS_V4_1
3730 /* Destroy the slot table */
3731 static void nfs4_destroy_slot_table(struct nfs4_session *session)
3732 {
3733         if (session->fc_slot_table.slots == NULL)
3734                 return;
3735         kfree(session->fc_slot_table.slots);
3736         session->fc_slot_table.slots = NULL;
3737         return;
3738 }
3739
3740 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
3741 {
3742         struct nfs4_session *session;
3743         struct nfs4_slot_table *tbl;
3744
3745         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
3746         if (!session)
3747                 return NULL;
3748         tbl = &session->fc_slot_table;
3749         spin_lock_init(&tbl->slot_tbl_lock);
3750         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
3751         session->clp = clp;
3752         return session;
3753 }
3754
3755 void nfs4_destroy_session(struct nfs4_session *session)
3756 {
3757         nfs4_destroy_slot_table(session);
3758         kfree(session);
3759 }
3760
3761 #endif /* CONFIG_NFS_V4_1 */
3762
3763 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3764         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3765         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3766         .recover_open   = nfs4_open_reclaim,
3767         .recover_lock   = nfs4_lock_reclaim,
3768 };
3769
3770 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3771         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3772         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3773         .recover_open   = nfs4_open_expired,
3774         .recover_lock   = nfs4_lock_expired,
3775 };
3776
3777 static const struct inode_operations nfs4_file_inode_operations = {
3778         .permission     = nfs_permission,
3779         .getattr        = nfs_getattr,
3780         .setattr        = nfs_setattr,
3781         .getxattr       = nfs4_getxattr,
3782         .setxattr       = nfs4_setxattr,
3783         .listxattr      = nfs4_listxattr,
3784 };
3785
3786 const struct nfs_rpc_ops nfs_v4_clientops = {
3787         .version        = 4,                    /* protocol version */
3788         .dentry_ops     = &nfs4_dentry_operations,
3789         .dir_inode_ops  = &nfs4_dir_inode_operations,
3790         .file_inode_ops = &nfs4_file_inode_operations,
3791         .getroot        = nfs4_proc_get_root,
3792         .getattr        = nfs4_proc_getattr,
3793         .setattr        = nfs4_proc_setattr,
3794         .lookupfh       = nfs4_proc_lookupfh,
3795         .lookup         = nfs4_proc_lookup,
3796         .access         = nfs4_proc_access,
3797         .readlink       = nfs4_proc_readlink,
3798         .create         = nfs4_proc_create,
3799         .remove         = nfs4_proc_remove,
3800         .unlink_setup   = nfs4_proc_unlink_setup,
3801         .unlink_done    = nfs4_proc_unlink_done,
3802         .rename         = nfs4_proc_rename,
3803         .link           = nfs4_proc_link,
3804         .symlink        = nfs4_proc_symlink,
3805         .mkdir          = nfs4_proc_mkdir,
3806         .rmdir          = nfs4_proc_remove,
3807         .readdir        = nfs4_proc_readdir,
3808         .mknod          = nfs4_proc_mknod,
3809         .statfs         = nfs4_proc_statfs,
3810         .fsinfo         = nfs4_proc_fsinfo,
3811         .pathconf       = nfs4_proc_pathconf,
3812         .set_capabilities = nfs4_server_capabilities,
3813         .decode_dirent  = nfs4_decode_dirent,
3814         .read_setup     = nfs4_proc_read_setup,
3815         .read_done      = nfs4_read_done,
3816         .write_setup    = nfs4_proc_write_setup,
3817         .write_done     = nfs4_write_done,
3818         .commit_setup   = nfs4_proc_commit_setup,
3819         .commit_done    = nfs4_commit_done,
3820         .lock           = nfs4_proc_lock,
3821         .clear_acl_cache = nfs4_zap_acl_attr,
3822         .close_context  = nfs4_close_context,
3823 };
3824
3825 /*
3826  * Local variables:
3827  *  c-basic-offset: 8
3828  * End:
3829  */