fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/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 "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 213                 nfsi->change_attr = cinfo->after;
 214         spin_unlock(&dir->i_lock);
 215 }
 216
 217 struct nfs4_opendata {
 218         struct kref kref;
 219         struct nfs_openargs o_arg;
 220         struct nfs_openres o_res;
 221         struct nfs_open_confirmargs c_arg;
 222         struct nfs_open_confirmres c_res;
 223         struct nfs_fattr f_attr;
 224         struct nfs_fattr dir_attr;
 225         struct path path;
 226         struct dentry *dir;
 227         struct nfs4_state_owner *owner;
 228         struct nfs4_state *state;
 229         struct iattr attrs;
 230         unsigned long timestamp;
 231         unsigned int rpc_done : 1;
 232         int rpc_status;
 233         int cancelled;
 234 };
 235
 236
 237 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 238 {
 239         p->o_res.f_attr = &p->f_attr;
 240         p->o_res.dir_attr = &p->dir_attr;
 241         p->o_res.server = p->o_arg.server;
 242         nfs_fattr_init(&p->f_attr);
 243         nfs_fattr_init(&p->dir_attr);
 244 }
 245
 246 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 247                 struct nfs4_state_owner *sp, int flags,
 248                 const struct iattr *attrs)
 249 {
 250         struct dentry *parent = dget_parent(path->dentry);
 251         struct inode *dir = parent->d_inode;
 252         struct nfs_server *server = NFS_SERVER(dir);
 253         struct nfs4_opendata *p;
 254
 255         p = kzalloc(sizeof(*p), GFP_KERNEL);
 256         if (p == NULL)
 257                 goto err;
 258         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 259         if (p->o_arg.seqid == NULL)
 260                 goto err_free;
 261         p->path.mnt = mntget(path->mnt);
 262         p->path.dentry = dget(path->dentry);
 263         p->dir = parent;
 264         p->owner = sp;
 265         atomic_inc(&sp->so_count);
 266         p->o_arg.fh = NFS_FH(dir);
 267         p->o_arg.open_flags = flags,
 268         p->o_arg.clientid = server->nfs_client->cl_clientid;
 269         p->o_arg.id = sp->so_owner_id.id;
 270         p->o_arg.name = &p->path.dentry->d_name;
 271         p->o_arg.server = server;
 272         p->o_arg.bitmask = server->attr_bitmask;
 273         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 274         if (flags & O_EXCL) {
 275                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 276                 s[0] = jiffies;
 277                 s[1] = current->pid;
 278         } else if (flags & O_CREAT) {
 279                 p->o_arg.u.attrs = &p->attrs;
 280                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 281         }
 282         p->c_arg.fh = &p->o_res.fh;
 283         p->c_arg.stateid = &p->o_res.stateid;
 284         p->c_arg.seqid = p->o_arg.seqid;
 285         nfs4_init_opendata_res(p);
 286         kref_init(&p->kref);
 287         return p;
 288 err_free:
 289         kfree(p);
 290 err:
 291         dput(parent);
 292         return NULL;
 293 }
 294
 295 static void nfs4_opendata_free(struct kref *kref)
 296 {
 297         struct nfs4_opendata *p = container_of(kref,
 298                         struct nfs4_opendata, kref);
 299
 300         nfs_free_seqid(p->o_arg.seqid);
 301         if (p->state != NULL)
 302                 nfs4_put_open_state(p->state);
 303         nfs4_put_state_owner(p->owner);
 304         dput(p->dir);
 305         dput(p->path.dentry);
 306         mntput(p->path.mnt);
 307         kfree(p);
 308 }
 309
 310 static void nfs4_opendata_put(struct nfs4_opendata *p)
 311 {
 312         if (p != NULL)
 313                 kref_put(&p->kref, nfs4_opendata_free);
 314 }
 315
 316 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 317 {
 318         sigset_t oldset;
 319         int ret;
 320
 321         rpc_clnt_sigmask(task->tk_client, &oldset);
 322         ret = rpc_wait_for_completion_task(task);
 323         rpc_clnt_sigunmask(task->tk_client, &oldset);
 324         return ret;
 325 }
 326
 327 static int can_open_cached(struct nfs4_state *state, int mode)
 328 {
 329         int ret = 0;
 330         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 331                 case FMODE_READ:
 332                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 333                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 338                         break;
 339                 case FMODE_READ|FMODE_WRITE:
 340                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 341         }
 342         return ret;
 343 }
 344
 345 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 346 {
 347         if ((delegation->type & open_flags) != open_flags)
 348                 return 0;
 349         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 350                 return 0;
 351         return 1;
 352 }
 353
 354 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 355 {
 356         switch (open_flags) {
 357                 case FMODE_WRITE:
 358                         state->n_wronly++;
 359                         break;
 360                 case FMODE_READ:
 361                         state->n_rdonly++;
 362                         break;
 363                 case FMODE_READ|FMODE_WRITE:
 364                         state->n_rdwr++;
 365         }
 366         nfs4_state_set_mode_locked(state, state->state | open_flags);
 367 }
 368
 369 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 370 {
 371         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 372                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 373         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 374         switch (open_flags) {
 375                 case FMODE_READ:
 376                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 377                         break;
 378                 case FMODE_WRITE:
 379                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 380                         break;
 381                 case FMODE_READ|FMODE_WRITE:
 382                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 383         }
 384 }
 385
 386 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 387 {
 388         write_seqlock(&state->seqlock);
 389         nfs_set_open_stateid_locked(state, stateid, open_flags);
 390         write_sequnlock(&state->seqlock);
 391 }
 392
 393 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 394 {
 395         open_flags &= (FMODE_READ|FMODE_WRITE);
 396         /*
 397          * Protect the call to nfs4_state_set_mode_locked and
 398          * serialise the stateid update
 399          */
 400         write_seqlock(&state->seqlock);
 401         if (deleg_stateid != NULL) {
 402                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 403                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 404         }
 405         if (open_stateid != NULL)
 406                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 407         write_sequnlock(&state->seqlock);
 408         spin_lock(&state->owner->so_lock);
 409         update_open_stateflags(state, open_flags);
 410         spin_unlock(&state->owner->so_lock);
 411 }
 412
 413 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 414 {
 415         struct nfs_delegation *delegation;
 416
 417         rcu_read_lock();
 418         delegation = rcu_dereference(NFS_I(inode)->delegation);
 419         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 420                 rcu_read_unlock();
 421                 return;
 422         }
 423         rcu_read_unlock();
 424         nfs_inode_return_delegation(inode);
 425 }
 426
 427 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 428 {
 429         struct nfs4_state *state = opendata->state;
 430         struct nfs_inode *nfsi = NFS_I(state->inode);
 431         struct nfs_delegation *delegation;
 432         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 433         nfs4_stateid stateid;
 434         int ret = -EAGAIN;
 435
 436         rcu_read_lock();
 437         delegation = rcu_dereference(nfsi->delegation);
 438         for (;;) {
 439                 if (can_open_cached(state, open_mode)) {
 440                         spin_lock(&state->owner->so_lock);
 441                         if (can_open_cached(state, open_mode)) {
 442                                 update_open_stateflags(state, open_mode);
 443                                 spin_unlock(&state->owner->so_lock);
 444                                 rcu_read_unlock();
 445                                 goto out_return_state;
 446                         }
 447                         spin_unlock(&state->owner->so_lock);
 448                 }
 449                 if (delegation == NULL)
 450                         break;
 451                 if (!can_open_delegated(delegation, open_mode))
 452                         break;
 453                 /* Save the delegation */
 454                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 455                 rcu_read_unlock();
 456                 lock_kernel();
 457                 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
 458                 unlock_kernel();
 459                 if (ret != 0)
 460                         goto out;
 461                 ret = -EAGAIN;
 462                 rcu_read_lock();
 463                 delegation = rcu_dereference(nfsi->delegation);
 464                 /* If no delegation, try a cached open */
 465                 if (delegation == NULL)
 466                         continue;
 467                 /* Is the delegation still valid? */
 468                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 469                         continue;
 470                 rcu_read_unlock();
 471                 update_open_stateid(state, NULL, &stateid, open_mode);
 472                 goto out_return_state;
 473         }
 474         rcu_read_unlock();
 475 out:
 476         return ERR_PTR(ret);
 477 out_return_state:
 478         atomic_inc(&state->count);
 479         return state;
 480 }
 481
 482 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 483 {
 484         struct inode *inode;
 485         struct nfs4_state *state = NULL;
 486         struct nfs_delegation *delegation;
 487         nfs4_stateid *deleg_stateid = NULL;
 488         int ret;
 489
 490         if (!data->rpc_done) {
 491                 state = nfs4_try_open_cached(data);
 492                 goto out;
 493         }
 494
 495         ret = -EAGAIN;
 496         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 497                 goto err;
 498         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 499         ret = PTR_ERR(inode);
 500         if (IS_ERR(inode))
 501                 goto err;
 502         ret = -ENOMEM;
 503         state = nfs4_get_open_state(inode, data->owner);
 504         if (state == NULL)
 505                 goto err_put_inode;
 506         if (data->o_res.delegation_type != 0) {
 507                 int delegation_flags = 0;
 508
 509                 rcu_read_lock();
 510                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 511                 if (delegation)
 512                         delegation_flags = delegation->flags;
 513                 rcu_read_unlock();
 514                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 515                         nfs_inode_set_delegation(state->inode,
 516                                         data->owner->so_cred,
 517                                         &data->o_res);
 518                 else
 519                         nfs_inode_reclaim_delegation(state->inode,
 520                                         data->owner->so_cred,
 521                                         &data->o_res);
 522         }
 523         rcu_read_lock();
 524         delegation = rcu_dereference(NFS_I(inode)->delegation);
 525         if (delegation != NULL)
 526                 deleg_stateid = &delegation->stateid;
 527         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 528         rcu_read_unlock();
 529         iput(inode);
 530 out:
 531         return state;
 532 err_put_inode:
 533         iput(inode);
 534 err:
 535         return ERR_PTR(ret);
 536 }
 537
 538 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 539 {
 540         struct nfs_inode *nfsi = NFS_I(state->inode);
 541         struct nfs_open_context *ctx;
 542
 543         spin_lock(&state->inode->i_lock);
 544         list_for_each_entry(ctx, &nfsi->open_files, list) {
 545                 if (ctx->state != state)
 546                         continue;
 547                 get_nfs_open_context(ctx);
 548                 spin_unlock(&state->inode->i_lock);
 549                 return ctx;
 550         }
 551         spin_unlock(&state->inode->i_lock);
 552         return ERR_PTR(-ENOENT);
 553 }
 554
 555 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 556 {
 557         struct nfs4_opendata *opendata;
 558
 559         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 560         if (opendata == NULL)
 561                 return ERR_PTR(-ENOMEM);
 562         opendata->state = state;
 563         atomic_inc(&state->count);
 564         return opendata;
 565 }
 566
 567 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 568 {
 569         struct nfs4_state *newstate;
 570         int ret;
 571
 572         opendata->o_arg.open_flags = openflags;
 573         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 574         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 575         nfs4_init_opendata_res(opendata);
 576         ret = _nfs4_proc_open(opendata);
 577         if (ret != 0)
 578                 return ret;
 579         newstate = nfs4_opendata_to_nfs4_state(opendata);
 580         if (IS_ERR(newstate))
 581                 return PTR_ERR(newstate);
 582         nfs4_close_state(&opendata->path, newstate, openflags);
 583         *res = newstate;
 584         return 0;
 585 }
 586
 587 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 588 {
 589         struct nfs4_state *newstate;
 590         int ret;
 591
 592         /* memory barrier prior to reading state->n_* */
 593         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 594         smp_rmb();
 595         if (state->n_rdwr != 0) {
 596                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 597                 if (ret != 0)
 598                         return ret;
 599                 if (newstate != state)
 600                         return -ESTALE;
 601         }
 602         if (state->n_wronly != 0) {
 603                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 604                 if (ret != 0)
 605                         return ret;
 606                 if (newstate != state)
 607                         return -ESTALE;
 608         }
 609         if (state->n_rdonly != 0) {
 610                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 611                 if (ret != 0)
 612                         return ret;
 613                 if (newstate != state)
 614                         return -ESTALE;
 615         }
 616         /*
 617          * We may have performed cached opens for all three recoveries.
 618          * Check if we need to update the current stateid.
 619          */
 620         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 621             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 622                 write_seqlock(&state->seqlock);
 623                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 624                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 625                 write_sequnlock(&state->seqlock);
 626         }
 627         return 0;
 628 }
 629
 630 /*
 631  * OPEN_RECLAIM:
 632  *      reclaim state on the server after a reboot.
 633  */
 634 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 635 {
 636         struct nfs_delegation *delegation;
 637         struct nfs4_opendata *opendata;
 638         int delegation_type = 0;
 639         int status;
 640
 641         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 642         if (IS_ERR(opendata))
 643                 return PTR_ERR(opendata);
 644         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 645         opendata->o_arg.fh = NFS_FH(state->inode);
 646         rcu_read_lock();
 647         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 648         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 649                 delegation_type = delegation->flags;
 650         rcu_read_unlock();
 651         opendata->o_arg.u.delegation_type = delegation_type;
 652         status = nfs4_open_recover(opendata, state);
 653         nfs4_opendata_put(opendata);
 654         return status;
 655 }
 656
 657 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 658 {
 659         struct nfs_server *server = NFS_SERVER(state->inode);
 660         struct nfs4_exception exception = { };
 661         int err;
 662         do {
 663                 err = _nfs4_do_open_reclaim(ctx, state);
 664                 if (err != -NFS4ERR_DELAY)
 665                         break;
 666                 nfs4_handle_exception(server, err, &exception);
 667         } while (exception.retry);
 668         return err;
 669 }
 670
 671 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 672 {
 673         struct nfs_open_context *ctx;
 674         int ret;
 675
 676         ctx = nfs4_state_find_open_context(state);
 677         if (IS_ERR(ctx))
 678                 return PTR_ERR(ctx);
 679         ret = nfs4_do_open_reclaim(ctx, state);
 680         put_nfs_open_context(ctx);
 681         return ret;
 682 }
 683
 684 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 685 {
 686         struct nfs4_opendata *opendata;
 687         int ret;
 688
 689         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 690         if (IS_ERR(opendata))
 691                 return PTR_ERR(opendata);
 692         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 693         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 694                         sizeof(opendata->o_arg.u.delegation.data));
 695         ret = nfs4_open_recover(opendata, state);
 696         nfs4_opendata_put(opendata);
 697         return ret;
 698 }
 699
 700 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 701 {
 702         struct nfs4_exception exception = { };
 703         struct nfs_server *server = NFS_SERVER(state->inode);
 704         int err;
 705         do {
 706                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 707                 switch (err) {
 708                         case 0:
 709                                 return err;
 710                         case -NFS4ERR_STALE_CLIENTID:
 711                         case -NFS4ERR_STALE_STATEID:
 712                         case -NFS4ERR_EXPIRED:
 713                                 /* Don't recall a delegation if it was lost */
 714                                 nfs4_schedule_state_recovery(server->nfs_client);
 715                                 return err;
 716                 }
 717                 err = nfs4_handle_exception(server, err, &exception);
 718         } while (exception.retry);
 719         return err;
 720 }
 721
 722 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 723 {
 724         struct nfs4_opendata *data = calldata;
 725         struct  rpc_message msg = {
 726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 727                 .rpc_argp = &data->c_arg,
 728                 .rpc_resp = &data->c_res,
 729                 .rpc_cred = data->owner->so_cred,
 730         };
 731         data->timestamp = jiffies;
 732         rpc_call_setup(task, &msg, 0);
 733 }
 734
 735 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 736 {
 737         struct nfs4_opendata *data = calldata;
 738
 739         data->rpc_status = task->tk_status;
 740         if (RPC_ASSASSINATED(task))
 741                 return;
 742         if (data->rpc_status == 0) {
 743                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 744                                 sizeof(data->o_res.stateid.data));
 745                 renew_lease(data->o_res.server, data->timestamp);
 746                 data->rpc_done = 1;
 747         }
 748         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 749         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 750 }
 751
 752 static void nfs4_open_confirm_release(void *calldata)
 753 {
 754         struct nfs4_opendata *data = calldata;
 755         struct nfs4_state *state = NULL;
 756
 757         /* If this request hasn't been cancelled, do nothing */
 758         if (data->cancelled == 0)
 759                 goto out_free;
 760         /* In case of error, no cleanup! */
 761         if (!data->rpc_done)
 762                 goto out_free;
 763         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 764         state = nfs4_opendata_to_nfs4_state(data);
 765         if (!IS_ERR(state))
 766                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 767 out_free:
 768         nfs4_opendata_put(data);
 769 }
 770
 771 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 772         .rpc_call_prepare = nfs4_open_confirm_prepare,
 773         .rpc_call_done = nfs4_open_confirm_done,
 774         .rpc_release = nfs4_open_confirm_release,
 775 };
 776
 777 /*
 778  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 779  */
 780 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 781 {
 782         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 783         struct rpc_task *task;
 784         int status;
 785
 786         kref_get(&data->kref);
 787         data->rpc_done = 0;
 788         data->rpc_status = 0;
 789         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 790         if (IS_ERR(task))
 791                 return PTR_ERR(task);
 792         status = nfs4_wait_for_completion_rpc_task(task);
 793         if (status != 0) {
 794                 data->cancelled = 1;
 795                 smp_wmb();
 796         } else
 797                 status = data->rpc_status;
 798         rpc_put_task(task);
 799         return status;
 800 }
 801
 802 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 803 {
 804         struct nfs4_opendata *data = calldata;
 805         struct nfs4_state_owner *sp = data->owner;
 806         struct rpc_message msg = {
 807                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 808                 .rpc_argp = &data->o_arg,
 809                 .rpc_resp = &data->o_res,
 810                 .rpc_cred = sp->so_cred,
 811         };
 812
 813         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 814                 return;
 815         /*
 816          * Check if we still need to send an OPEN call, or if we can use
 817          * a delegation instead.
 818          */
 819         if (data->state != NULL) {
 820                 struct nfs_delegation *delegation;
 821
 822                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 823                         goto out_no_action;
 824                 rcu_read_lock();
 825                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 826                 if (delegation != NULL &&
 827                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 828                         rcu_read_unlock();
 829                         goto out_no_action;
 830                 }
 831                 rcu_read_unlock();
 832         }
 833         /* Update sequence id. */
 834         data->o_arg.id = sp->so_owner_id.id;
 835         data->o_arg.clientid = sp->so_client->cl_clientid;
 836         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 837                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 838                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 839         }
 840         data->timestamp = jiffies;
 841         rpc_call_setup(task, &msg, 0);
 842         return;
 843 out_no_action:
 844         task->tk_action = NULL;
 845
 846 }
 847
 848 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 849 {
 850         struct nfs4_opendata *data = calldata;
 851
 852         data->rpc_status = task->tk_status;
 853         if (RPC_ASSASSINATED(task))
 854                 return;
 855         if (task->tk_status == 0) {
 856                 switch (data->o_res.f_attr->mode & S_IFMT) {
 857                         case S_IFREG:
 858                                 break;
 859                         case S_IFLNK:
 860                                 data->rpc_status = -ELOOP;
 861                                 break;
 862                         case S_IFDIR:
 863                                 data->rpc_status = -EISDIR;
 864                                 break;
 865                         default:
 866                                 data->rpc_status = -ENOTDIR;
 867                 }
 868                 renew_lease(data->o_res.server, data->timestamp);
 869                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 870                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 871         }
 872         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 873         data->rpc_done = 1;
 874 }
 875
 876 static void nfs4_open_release(void *calldata)
 877 {
 878         struct nfs4_opendata *data = calldata;
 879         struct nfs4_state *state = NULL;
 880
 881         /* If this request hasn't been cancelled, do nothing */
 882         if (data->cancelled == 0)
 883                 goto out_free;
 884         /* In case of error, no cleanup! */
 885         if (data->rpc_status != 0 || !data->rpc_done)
 886                 goto out_free;
 887         /* In case we need an open_confirm, no cleanup! */
 888         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 889                 goto out_free;
 890         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 891         state = nfs4_opendata_to_nfs4_state(data);
 892         if (!IS_ERR(state))
 893                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 894 out_free:
 895         nfs4_opendata_put(data);
 896 }
 897
 898 static const struct rpc_call_ops nfs4_open_ops = {
 899         .rpc_call_prepare = nfs4_open_prepare,
 900         .rpc_call_done = nfs4_open_done,
 901         .rpc_release = nfs4_open_release,
 902 };
 903
 904 /*
 905  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 906  */
 907 static int _nfs4_proc_open(struct nfs4_opendata *data)
 908 {
 909         struct inode *dir = data->dir->d_inode;
 910         struct nfs_server *server = NFS_SERVER(dir);
 911         struct nfs_openargs *o_arg = &data->o_arg;
 912         struct nfs_openres *o_res = &data->o_res;
 913         struct rpc_task *task;
 914         int status;
 915
 916         kref_get(&data->kref);
 917         data->rpc_done = 0;
 918         data->rpc_status = 0;
 919         data->cancelled = 0;
 920         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 921         if (IS_ERR(task))
 922                 return PTR_ERR(task);
 923         status = nfs4_wait_for_completion_rpc_task(task);
 924         if (status != 0) {
 925                 data->cancelled = 1;
 926                 smp_wmb();
 927         } else
 928                 status = data->rpc_status;
 929         rpc_put_task(task);
 930         if (status != 0 || !data->rpc_done)
 931                 return status;
 932
 933         if (o_arg->open_flags & O_CREAT) {
 934                 update_changeattr(dir, &o_res->cinfo);
 935                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 936         } else
 937                 nfs_refresh_inode(dir, o_res->dir_attr);
 938         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 939                 status = _nfs4_proc_open_confirm(data);
 940                 if (status != 0)
 941                         return status;
 942         }
 943         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 944                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 945         return 0;
 946 }
 947
 948 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 949 {
 950         struct nfs_access_entry cache;
 951         int mask = 0;
 952         int status;
 953
 954         if (openflags & FMODE_READ)
 955                 mask |= MAY_READ;
 956         if (openflags & FMODE_WRITE)
 957                 mask |= MAY_WRITE;
 958         if (openflags & FMODE_EXEC)
 959                 mask |= MAY_EXEC;
 960         status = nfs_access_get_cached(inode, cred, &cache);
 961         if (status == 0)
 962                 goto out;
 963
 964         /* Be clever: ask server to check for all possible rights */
 965         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 966         cache.cred = cred;
 967         cache.jiffies = jiffies;
 968         status = _nfs4_proc_access(inode, &cache);
 969         if (status != 0)
 970                 return status;
 971         nfs_access_add_cache(inode, &cache);
 972 out:
 973         if ((cache.mask & mask) == mask)
 974                 return 0;
 975         return -EACCES;
 976 }
 977
 978 static int nfs4_recover_expired_lease(struct nfs_server *server)
 979 {
 980         struct nfs_client *clp = server->nfs_client;
 981         int ret;
 982
 983         for (;;) {
 984                 ret = nfs4_wait_clnt_recover(server->client, clp);
 985                 if (ret != 0)
 986                         return ret;
 987                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 988                         break;
 989                 nfs4_schedule_state_recovery(clp);
 990         }
 991         return 0;
 992 }
 993
 994 /*
 995  * OPEN_EXPIRED:
 996  *      reclaim state on the server after a network partition.
 997  *      Assumes caller holds the appropriate lock
 998  */
 999 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1000 {
1001         struct nfs4_opendata *opendata;
1002         int ret;
1003
1004         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1005         if (IS_ERR(opendata))
1006                 return PTR_ERR(opendata);
1007         ret = nfs4_open_recover(opendata, state);
1008         if (ret == -ESTALE) {
1009                 /* Invalidate the state owner so we don't ever use it again */
1010                 nfs4_drop_state_owner(state->owner);
1011                 d_drop(ctx->path.dentry);
1012         }
1013         nfs4_opendata_put(opendata);
1014         return ret;
1015 }
1016
1017 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1018 {
1019         struct nfs_server *server = NFS_SERVER(state->inode);
1020         struct nfs4_exception exception = { };
1021         int err;
1022
1023         do {
1024                 err = _nfs4_open_expired(ctx, state);
1025                 if (err == -NFS4ERR_DELAY)
1026                         nfs4_handle_exception(server, err, &exception);
1027         } while (exception.retry);
1028         return err;
1029 }
1030
1031 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1032 {
1033         struct nfs_open_context *ctx;
1034         int ret;
1035
1036         ctx = nfs4_state_find_open_context(state);
1037         if (IS_ERR(ctx))
1038                 return PTR_ERR(ctx);
1039         ret = nfs4_do_open_expired(ctx, state);
1040         put_nfs_open_context(ctx);
1041         return ret;
1042 }
1043
1044 /*
1045  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1046  * fields corresponding to attributes that were used to store the verifier.
1047  * Make sure we clobber those fields in the later setattr call
1048  */
1049 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1050 {
1051         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1052             !(sattr->ia_valid & ATTR_ATIME_SET))
1053                 sattr->ia_valid |= ATTR_ATIME;
1054
1055         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1056             !(sattr->ia_valid & ATTR_MTIME_SET))
1057                 sattr->ia_valid |= ATTR_MTIME;
1058 }
1059
1060 /*
1061  * Returns a referenced nfs4_state
1062  */
1063 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1064 {
1065         struct nfs4_state_owner  *sp;
1066         struct nfs4_state     *state = NULL;
1067         struct nfs_server       *server = NFS_SERVER(dir);
1068         struct nfs_client *clp = server->nfs_client;
1069         struct nfs4_opendata *opendata;
1070         int status;
1071
1072         /* Protect against reboot recovery conflicts */
1073         status = -ENOMEM;
1074         if (!(sp = nfs4_get_state_owner(server, cred))) {
1075                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1076                 goto out_err;
1077         }
1078         status = nfs4_recover_expired_lease(server);
1079         if (status != 0)
1080                 goto err_put_state_owner;
1081         if (path->dentry->d_inode != NULL)
1082                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1083         down_read(&clp->cl_sem);
1084         status = -ENOMEM;
1085         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1086         if (opendata == NULL)
1087                 goto err_release_rwsem;
1088
1089         if (path->dentry->d_inode != NULL)
1090                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1091
1092         status = _nfs4_proc_open(opendata);
1093         if (status != 0)
1094                 goto err_opendata_put;
1095
1096         if (opendata->o_arg.open_flags & O_EXCL)
1097                 nfs4_exclusive_attrset(opendata, sattr);
1098
1099         state = nfs4_opendata_to_nfs4_state(opendata);
1100         status = PTR_ERR(state);
1101         if (IS_ERR(state))
1102                 goto err_opendata_put;
1103         nfs4_opendata_put(opendata);
1104         nfs4_put_state_owner(sp);
1105         up_read(&clp->cl_sem);
1106         *res = state;
1107         return 0;
1108 err_opendata_put:
1109         nfs4_opendata_put(opendata);
1110 err_release_rwsem:
1111         up_read(&clp->cl_sem);
1112 err_put_state_owner:
1113         nfs4_put_state_owner(sp);
1114 out_err:
1115         *res = NULL;
1116         return status;
1117 }
1118
1119
1120 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1121 {
1122         struct nfs4_exception exception = { };
1123         struct nfs4_state *res;
1124         int status;
1125
1126         do {
1127                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1128                 if (status == 0)
1129                         break;
1130                 /* NOTE: BAD_SEQID means the server and client disagree about the
1131                  * book-keeping w.r.t. state-changing operations
1132                  * (OPEN/CLOSE/LOCK/LOCKU...)
1133                  * It is actually a sign of a bug on the client or on the server.
1134                  *
1135                  * If we receive a BAD_SEQID error in the particular case of
1136                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1137                  * have unhashed the old state_owner for us, and that we can
1138                  * therefore safely retry using a new one. We should still warn
1139                  * the user though...
1140                  */
1141                 if (status == -NFS4ERR_BAD_SEQID) {
1142                         printk(KERN_WARNING "NFS: v4 server %s "
1143                                         " returned a bad sequence-id error!\n",
1144                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1145                         exception.retry = 1;
1146                         continue;
1147                 }
1148                 /*
1149                  * BAD_STATEID on OPEN means that the server cancelled our
1150                  * state before it received the OPEN_CONFIRM.
1151                  * Recover by retrying the request as per the discussion
1152                  * on Page 181 of RFC3530.
1153                  */
1154                 if (status == -NFS4ERR_BAD_STATEID) {
1155                         exception.retry = 1;
1156                         continue;
1157                 }
1158                 if (status == -EAGAIN) {
1159                         /* We must have found a delegation */
1160                         exception.retry = 1;
1161                         continue;
1162                 }
1163                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1164                                         status, &exception));
1165         } while (exception.retry);
1166         return res;
1167 }
1168
1169 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1170                 struct iattr *sattr, struct nfs4_state *state)
1171 {
1172         struct nfs_server *server = NFS_SERVER(inode);
1173         struct nfs_setattrargs  arg = {
1174                 .fh             = NFS_FH(inode),
1175                 .iap            = sattr,
1176                 .server         = server,
1177                 .bitmask = server->attr_bitmask,
1178         };
1179         struct nfs_setattrres  res = {
1180                 .fattr          = fattr,
1181                 .server         = server,
1182         };
1183         struct rpc_message msg = {
1184                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1185                 .rpc_argp       = &arg,
1186                 .rpc_resp       = &res,
1187         };
1188         unsigned long timestamp = jiffies;
1189         int status;
1190
1191         nfs_fattr_init(fattr);
1192
1193         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1194                 /* Use that stateid */
1195         } else if (state != NULL) {
1196                 msg.rpc_cred = state->owner->so_cred;
1197                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1198         } else
1199                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1200
1201         status = rpc_call_sync(server->client, &msg, 0);
1202         if (status == 0 && state != NULL)
1203                 renew_lease(server, timestamp);
1204         return status;
1205 }
1206
1207 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1208                 struct iattr *sattr, struct nfs4_state *state)
1209 {
1210         struct nfs_server *server = NFS_SERVER(inode);
1211         struct nfs4_exception exception = { };
1212         int err;
1213         do {
1214                 err = nfs4_handle_exception(server,
1215                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1216                                 &exception);
1217         } while (exception.retry);
1218         return err;
1219 }
1220
1221 struct nfs4_closedata {
1222         struct path path;
1223         struct inode *inode;
1224         struct nfs4_state *state;
1225         struct nfs_closeargs arg;
1226         struct nfs_closeres res;
1227         struct nfs_fattr fattr;
1228         unsigned long timestamp;
1229 };
1230
1231 static void nfs4_free_closedata(void *data)
1232 {
1233         struct nfs4_closedata *calldata = data;
1234         struct nfs4_state_owner *sp = calldata->state->owner;
1235
1236         nfs4_put_open_state(calldata->state);
1237         nfs_free_seqid(calldata->arg.seqid);
1238         nfs4_put_state_owner(sp);
1239         dput(calldata->path.dentry);
1240         mntput(calldata->path.mnt);
1241         kfree(calldata);
1242 }
1243
1244 static void nfs4_close_done(struct rpc_task *task, void *data)
1245 {
1246         struct nfs4_closedata *calldata = data;
1247         struct nfs4_state *state = calldata->state;
1248         struct nfs_server *server = NFS_SERVER(calldata->inode);
1249
1250         if (RPC_ASSASSINATED(task))
1251                 return;
1252         /* hmm. we are done with the inode, and in the process of freeing
1253          * the state_owner. we keep this around to process errors
1254          */
1255         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1256         switch (task->tk_status) {
1257                 case 0:
1258                         nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
1259                         renew_lease(server, calldata->timestamp);
1260                         break;
1261                 case -NFS4ERR_STALE_STATEID:
1262                 case -NFS4ERR_EXPIRED:
1263                         break;
1264                 default:
1265                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1266                                 rpc_restart_call(task);
1267                                 return;
1268                         }
1269         }
1270         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1271 }
1272
1273 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1274 {
1275         struct nfs4_closedata *calldata = data;
1276         struct nfs4_state *state = calldata->state;
1277         struct rpc_message msg = {
1278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1279                 .rpc_argp = &calldata->arg,
1280                 .rpc_resp = &calldata->res,
1281                 .rpc_cred = state->owner->so_cred,
1282         };
1283         int clear_rd, clear_wr, clear_rdwr;
1284         int mode;
1285
1286         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1287                 return;
1288
1289         mode = FMODE_READ|FMODE_WRITE;
1290         clear_rd = clear_wr = clear_rdwr = 0;
1291         spin_lock(&state->owner->so_lock);
1292         /* Calculate the change in open mode */
1293         if (state->n_rdwr == 0) {
1294                 if (state->n_rdonly == 0) {
1295                         mode &= ~FMODE_READ;
1296                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1297                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1298                 }
1299                 if (state->n_wronly == 0) {
1300                         mode &= ~FMODE_WRITE;
1301                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1302                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1303                 }
1304         }
1305         spin_unlock(&state->owner->so_lock);
1306         if (!clear_rd && !clear_wr && !clear_rdwr) {
1307                 /* Note: exit _without_ calling nfs4_close_done */
1308                 task->tk_action = NULL;
1309                 return;
1310         }
1311         nfs_fattr_init(calldata->res.fattr);
1312         if (mode != 0)
1313                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1314         calldata->arg.open_flags = mode;
1315         calldata->timestamp = jiffies;
1316         rpc_call_setup(task, &msg, 0);
1317 }
1318
1319 static const struct rpc_call_ops nfs4_close_ops = {
1320         .rpc_call_prepare = nfs4_close_prepare,
1321         .rpc_call_done = nfs4_close_done,
1322         .rpc_release = nfs4_free_closedata,
1323 };
1324
1325 /*
1326  * It is possible for data to be read/written from a mem-mapped file
1327  * after the sys_close call (which hits the vfs layer as a flush).
1328  * This means that we can't safely call nfsv4 close on a file until
1329  * the inode is cleared. This in turn means that we are not good
1330  * NFSv4 citizens - we do not indicate to the server to update the file's
1331  * share state even when we are done with one of the three share
1332  * stateid's in the inode.
1333  *
1334  * NOTE: Caller must be holding the sp->so_owner semaphore!
1335  */
1336 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1337 {
1338         struct nfs_server *server = NFS_SERVER(state->inode);
1339         struct nfs4_closedata *calldata;
1340         struct nfs4_state_owner *sp = state->owner;
1341         struct rpc_task *task;
1342         int status = -ENOMEM;
1343
1344         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1345         if (calldata == NULL)
1346                 goto out;
1347         calldata->inode = state->inode;
1348         calldata->state = state;
1349         calldata->arg.fh = NFS_FH(state->inode);
1350         calldata->arg.stateid = &state->open_stateid;
1351         /* Serialization for the sequence id */
1352         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1353         if (calldata->arg.seqid == NULL)
1354                 goto out_free_calldata;
1355         calldata->arg.bitmask = server->attr_bitmask;
1356         calldata->res.fattr = &calldata->fattr;
1357         calldata->res.server = server;
1358         calldata->path.mnt = mntget(path->mnt);
1359         calldata->path.dentry = dget(path->dentry);
1360
1361         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1362         if (IS_ERR(task))
1363                 return PTR_ERR(task);
1364         rpc_put_task(task);
1365         return 0;
1366 out_free_calldata:
1367         kfree(calldata);
1368 out:
1369         nfs4_put_open_state(state);
1370         nfs4_put_state_owner(sp);
1371         return status;
1372 }
1373
1374 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1375 {
1376         struct file *filp;
1377         int ret;
1378
1379         /* If the open_intent is for execute, we have an extra check to make */
1380         if (nd->intent.open.flags & FMODE_EXEC) {
1381                 ret = _nfs4_do_access(state->inode,
1382                                 state->owner->so_cred,
1383                                 nd->intent.open.flags);
1384                 if (ret < 0)
1385                         goto out_close;
1386         }
1387         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1388         if (!IS_ERR(filp)) {
1389                 struct nfs_open_context *ctx;
1390                 ctx = (struct nfs_open_context *)filp->private_data;
1391                 ctx->state = state;
1392                 return 0;
1393         }
1394         ret = PTR_ERR(filp);
1395 out_close:
1396         nfs4_close_state(path, state, nd->intent.open.flags);
1397         return ret;
1398 }
1399
1400 struct dentry *
1401 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1402 {
1403         struct path path = {
1404                 .mnt = nd->mnt,
1405                 .dentry = dentry,
1406         };
1407         struct iattr attr;
1408         struct rpc_cred *cred;
1409         struct nfs4_state *state;
1410         struct dentry *res;
1411
1412         if (nd->flags & LOOKUP_CREATE) {
1413                 attr.ia_mode = nd->intent.open.create_mode;
1414                 attr.ia_valid = ATTR_MODE;
1415                 if (!IS_POSIXACL(dir))
1416                         attr.ia_mode &= ~current->fs->umask;
1417         } else {
1418                 attr.ia_valid = 0;
1419                 BUG_ON(nd->intent.open.flags & O_CREAT);
1420         }
1421
1422         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1423         if (IS_ERR(cred))
1424                 return (struct dentry *)cred;
1425         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1426         put_rpccred(cred);
1427         if (IS_ERR(state)) {
1428                 if (PTR_ERR(state) == -ENOENT)
1429                         d_add(dentry, NULL);
1430                 return (struct dentry *)state;
1431         }
1432         res = d_add_unique(dentry, igrab(state->inode));
1433         if (res != NULL)
1434                 dentry = res;
1435         nfs4_intent_set_file(nd, &path, state);
1436         return res;
1437 }
1438
1439 int
1440 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1441 {
1442         struct path path = {
1443                 .mnt = nd->mnt,
1444                 .dentry = dentry,
1445         };
1446         struct rpc_cred *cred;
1447         struct nfs4_state *state;
1448
1449         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1450         if (IS_ERR(cred))
1451                 return PTR_ERR(cred);
1452         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1453         put_rpccred(cred);
1454         if (IS_ERR(state)) {
1455                 switch (PTR_ERR(state)) {
1456                         case -EPERM:
1457                         case -EACCES:
1458                         case -EDQUOT:
1459                         case -ENOSPC:
1460                         case -EROFS:
1461                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1462                                 return 1;
1463                         default:
1464                                 goto out_drop;
1465                 }
1466         }
1467         if (state->inode == dentry->d_inode) {
1468                 nfs4_intent_set_file(nd, &path, state);
1469                 return 1;
1470         }
1471         nfs4_close_state(&path, state, openflags);
1472 out_drop:
1473         d_drop(dentry);
1474         return 0;
1475 }
1476
1477
1478 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1479 {
1480         struct nfs4_server_caps_res res = {};
1481         struct rpc_message msg = {
1482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1483                 .rpc_argp = fhandle,
1484                 .rpc_resp = &res,
1485         };
1486         int status;
1487
1488         status = rpc_call_sync(server->client, &msg, 0);
1489         if (status == 0) {
1490                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1491                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1492                         server->caps |= NFS_CAP_ACLS;
1493                 if (res.has_links != 0)
1494                         server->caps |= NFS_CAP_HARDLINKS;
1495                 if (res.has_symlinks != 0)
1496                         server->caps |= NFS_CAP_SYMLINKS;
1497                 server->acl_bitmask = res.acl_bitmask;
1498         }
1499         return status;
1500 }
1501
1502 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1503 {
1504         struct nfs4_exception exception = { };
1505         int err;
1506         do {
1507                 err = nfs4_handle_exception(server,
1508                                 _nfs4_server_capabilities(server, fhandle),
1509                                 &exception);
1510         } while (exception.retry);
1511         return err;
1512 }
1513
1514 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1515                 struct nfs_fsinfo *info)
1516 {
1517         struct nfs4_lookup_root_arg args = {
1518                 .bitmask = nfs4_fattr_bitmap,
1519         };
1520         struct nfs4_lookup_res res = {
1521                 .server = server,
1522                 .fattr = info->fattr,
1523                 .fh = fhandle,
1524         };
1525         struct rpc_message msg = {
1526                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1527                 .rpc_argp = &args,
1528                 .rpc_resp = &res,
1529         };
1530         nfs_fattr_init(info->fattr);
1531         return rpc_call_sync(server->client, &msg, 0);
1532 }
1533
1534 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1535                 struct nfs_fsinfo *info)
1536 {
1537         struct nfs4_exception exception = { };
1538         int err;
1539         do {
1540                 err = nfs4_handle_exception(server,
1541                                 _nfs4_lookup_root(server, fhandle, info),
1542                                 &exception);
1543         } while (exception.retry);
1544         return err;
1545 }
1546
1547 /*
1548  * get the file handle for the "/" directory on the server
1549  */
1550 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1551                               struct nfs_fsinfo *info)
1552 {
1553         int status;
1554
1555         status = nfs4_lookup_root(server, fhandle, info);
1556         if (status == 0)
1557                 status = nfs4_server_capabilities(server, fhandle);
1558         if (status == 0)
1559                 status = nfs4_do_fsinfo(server, fhandle, info);
1560         return nfs4_map_errors(status);
1561 }
1562
1563 /*
1564  * Get locations and (maybe) other attributes of a referral.
1565  * Note that we'll actually follow the referral later when
1566  * we detect fsid mismatch in inode revalidation
1567  */
1568 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1569 {
1570         int status = -ENOMEM;
1571         struct page *page = NULL;
1572         struct nfs4_fs_locations *locations = NULL;
1573
1574         page = alloc_page(GFP_KERNEL);
1575         if (page == NULL)
1576                 goto out;
1577         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1578         if (locations == NULL)
1579                 goto out;
1580
1581         status = nfs4_proc_fs_locations(dir, name, locations, page);
1582         if (status != 0)
1583                 goto out;
1584         /* Make sure server returned a different fsid for the referral */
1585         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1586                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1587                 status = -EIO;
1588                 goto out;
1589         }
1590
1591         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1592         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1593         if (!fattr->mode)
1594                 fattr->mode = S_IFDIR;
1595         memset(fhandle, 0, sizeof(struct nfs_fh));
1596 out:
1597         if (page)
1598                 __free_page(page);
1599         if (locations)
1600                 kfree(locations);
1601         return status;
1602 }
1603
1604 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1605 {
1606         struct nfs4_getattr_arg args = {
1607                 .fh = fhandle,
1608                 .bitmask = server->attr_bitmask,
1609         };
1610         struct nfs4_getattr_res res = {
1611                 .fattr = fattr,
1612                 .server = server,
1613         };
1614         struct rpc_message msg = {
1615                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1616                 .rpc_argp = &args,
1617                 .rpc_resp = &res,
1618         };
1619
1620         nfs_fattr_init(fattr);
1621         return rpc_call_sync(server->client, &msg, 0);
1622 }
1623
1624 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1625 {
1626         struct nfs4_exception exception = { };
1627         int err;
1628         do {
1629                 err = nfs4_handle_exception(server,
1630                                 _nfs4_proc_getattr(server, fhandle, fattr),
1631                                 &exception);
1632         } while (exception.retry);
1633         return err;
1634 }
1635
1636 /*
1637  * The file is not closed if it is opened due to the a request to change
1638  * the size of the file. The open call will not be needed once the
1639  * VFS layer lookup-intents are implemented.
1640  *
1641  * Close is called when the inode is destroyed.
1642  * If we haven't opened the file for O_WRONLY, we
1643  * need to in the size_change case to obtain a stateid.
1644  *
1645  * Got race?
1646  * Because OPEN is always done by name in nfsv4, it is
1647  * possible that we opened a different file by the same
1648  * name.  We can recognize this race condition, but we
1649  * can't do anything about it besides returning an error.
1650  *
1651  * This will be fixed with VFS changes (lookup-intent).
1652  */
1653 static int
1654 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1655                   struct iattr *sattr)
1656 {
1657         struct rpc_cred *cred;
1658         struct inode *inode = dentry->d_inode;
1659         struct nfs_open_context *ctx;
1660         struct nfs4_state *state = NULL;
1661         int status;
1662
1663         nfs_fattr_init(fattr);
1664
1665         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1666         if (IS_ERR(cred))
1667                 return PTR_ERR(cred);
1668
1669         /* Search for an existing open(O_WRITE) file */
1670         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1671         if (ctx != NULL)
1672                 state = ctx->state;
1673
1674         status = nfs4_do_setattr(inode, fattr, sattr, state);
1675         if (status == 0)
1676                 nfs_setattr_update_inode(inode, sattr);
1677         if (ctx != NULL)
1678                 put_nfs_open_context(ctx);
1679         put_rpccred(cred);
1680         return status;
1681 }
1682
1683 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1684                 struct qstr *name, struct nfs_fh *fhandle,
1685                 struct nfs_fattr *fattr)
1686 {
1687         int                    status;
1688         struct nfs4_lookup_arg args = {
1689                 .bitmask = server->attr_bitmask,
1690                 .dir_fh = dirfh,
1691                 .name = name,
1692         };
1693         struct nfs4_lookup_res res = {
1694                 .server = server,
1695                 .fattr = fattr,
1696                 .fh = fhandle,
1697         };
1698         struct rpc_message msg = {
1699                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1700                 .rpc_argp = &args,
1701                 .rpc_resp = &res,
1702         };
1703
1704         nfs_fattr_init(fattr);
1705
1706         dprintk("NFS call  lookupfh %s\n", name->name);
1707         status = rpc_call_sync(server->client, &msg, 0);
1708         dprintk("NFS reply lookupfh: %d\n", status);
1709         return status;
1710 }
1711
1712 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1713                               struct qstr *name, struct nfs_fh *fhandle,
1714                               struct nfs_fattr *fattr)
1715 {
1716         struct nfs4_exception exception = { };
1717         int err;
1718         do {
1719                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1720                 /* FIXME: !!!! */
1721                 if (err == -NFS4ERR_MOVED) {
1722                         err = -EREMOTE;
1723                         break;
1724                 }
1725                 err = nfs4_handle_exception(server, err, &exception);
1726         } while (exception.retry);
1727         return err;
1728 }
1729
1730 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1731                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1732 {
1733         int status;
1734
1735         dprintk("NFS call  lookup %s\n", name->name);
1736         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1737         if (status == -NFS4ERR_MOVED)
1738                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1739         dprintk("NFS reply lookup: %d\n", status);
1740         return status;
1741 }
1742
1743 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1744 {
1745         struct nfs4_exception exception = { };
1746         int err;
1747         do {
1748                 err = nfs4_handle_exception(NFS_SERVER(dir),
1749                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1750                                 &exception);
1751         } while (exception.retry);
1752         return err;
1753 }
1754
1755 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1756 {
1757         struct nfs4_accessargs args = {
1758                 .fh = NFS_FH(inode),
1759         };
1760         struct nfs4_accessres res = { 0 };
1761         struct rpc_message msg = {
1762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1763                 .rpc_argp = &args,
1764                 .rpc_resp = &res,
1765                 .rpc_cred = entry->cred,
1766         };
1767         int mode = entry->mask;
1768         int status;
1769
1770         /*
1771          * Determine which access bits we want to ask for...
1772          */
1773         if (mode & MAY_READ)
1774                 args.access |= NFS4_ACCESS_READ;
1775         if (S_ISDIR(inode->i_mode)) {
1776                 if (mode & MAY_WRITE)
1777                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1778                 if (mode & MAY_EXEC)
1779                         args.access |= NFS4_ACCESS_LOOKUP;
1780         } else {
1781                 if (mode & MAY_WRITE)
1782                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1783                 if (mode & MAY_EXEC)
1784                         args.access |= NFS4_ACCESS_EXECUTE;
1785         }
1786         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1787         if (!status) {
1788                 entry->mask = 0;
1789                 if (res.access & NFS4_ACCESS_READ)
1790                         entry->mask |= MAY_READ;
1791                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1792                         entry->mask |= MAY_WRITE;
1793                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1794                         entry->mask |= MAY_EXEC;
1795         }
1796         return status;
1797 }
1798
1799 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1800 {
1801         struct nfs4_exception exception = { };
1802         int err;
1803         do {
1804                 err = nfs4_handle_exception(NFS_SERVER(inode),
1805                                 _nfs4_proc_access(inode, entry),
1806                                 &exception);
1807         } while (exception.retry);
1808         return err;
1809 }
1810
1811 /*
1812  * TODO: For the time being, we don't try to get any attributes
1813  * along with any of the zero-copy operations READ, READDIR,
1814  * READLINK, WRITE.
1815  *
1816  * In the case of the first three, we want to put the GETATTR
1817  * after the read-type operation -- this is because it is hard
1818  * to predict the length of a GETATTR response in v4, and thus
1819  * align the READ data correctly.  This means that the GETATTR
1820  * may end up partially falling into the page cache, and we should
1821  * shift it into the 'tail' of the xdr_buf before processing.
1822  * To do this efficiently, we need to know the total length
1823  * of data received, which doesn't seem to be available outside
1824  * of the RPC layer.
1825  *
1826  * In the case of WRITE, we also want to put the GETATTR after
1827  * the operation -- in this case because we want to make sure
1828  * we get the post-operation mtime and size.  This means that
1829  * we can't use xdr_encode_pages() as written: we need a variant
1830  * of it which would leave room in the 'tail' iovec.
1831  *
1832  * Both of these changes to the XDR layer would in fact be quite
1833  * minor, but I decided to leave them for a subsequent patch.
1834  */
1835 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1836                 unsigned int pgbase, unsigned int pglen)
1837 {
1838         struct nfs4_readlink args = {
1839                 .fh       = NFS_FH(inode),
1840                 .pgbase   = pgbase,
1841                 .pglen    = pglen,
1842                 .pages    = &page,
1843         };
1844         struct rpc_message msg = {
1845                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1846                 .rpc_argp = &args,
1847                 .rpc_resp = NULL,
1848         };
1849
1850         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1851 }
1852
1853 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1854                 unsigned int pgbase, unsigned int pglen)
1855 {
1856         struct nfs4_exception exception = { };
1857         int err;
1858         do {
1859                 err = nfs4_handle_exception(NFS_SERVER(inode),
1860                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1861                                 &exception);
1862         } while (exception.retry);
1863         return err;
1864 }
1865
1866 /*
1867  * Got race?
1868  * We will need to arrange for the VFS layer to provide an atomic open.
1869  * Until then, this create/open method is prone to inefficiency and race
1870  * conditions due to the lookup, create, and open VFS calls from sys_open()
1871  * placed on the wire.
1872  *
1873  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1874  * The file will be opened again in the subsequent VFS open call
1875  * (nfs4_proc_file_open).
1876  *
1877  * The open for read will just hang around to be used by any process that
1878  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1879  */
1880
1881 static int
1882 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1883                  int flags, struct nameidata *nd)
1884 {
1885         struct path path = {
1886                 .mnt = nd->mnt,
1887                 .dentry = dentry,
1888         };
1889         struct nfs4_state *state;
1890         struct rpc_cred *cred;
1891         int status = 0;
1892
1893         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1894         if (IS_ERR(cred)) {
1895                 status = PTR_ERR(cred);
1896                 goto out;
1897         }
1898         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1899         put_rpccred(cred);
1900         if (IS_ERR(state)) {
1901                 status = PTR_ERR(state);
1902                 goto out;
1903         }
1904         d_instantiate(dentry, igrab(state->inode));
1905         if (flags & O_EXCL) {
1906                 struct nfs_fattr fattr;
1907                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1908                 if (status == 0)
1909                         nfs_setattr_update_inode(state->inode, sattr);
1910                 nfs_post_op_update_inode(state->inode, &fattr);
1911         }
1912         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1913                 status = nfs4_intent_set_file(nd, &path, state);
1914         else
1915                 nfs4_close_state(&path, state, flags);
1916 out:
1917         return status;
1918 }
1919
1920 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1921 {
1922         struct nfs_server *server = NFS_SERVER(dir);
1923         struct nfs4_remove_arg args = {
1924                 .fh = NFS_FH(dir),
1925                 .name = name,
1926                 .bitmask = server->attr_bitmask,
1927         };
1928         struct nfs_fattr dir_attr;
1929         struct nfs4_remove_res  res = {
1930                 .server = server,
1931                 .dir_attr = &dir_attr,
1932         };
1933         struct rpc_message msg = {
1934                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1935                 .rpc_argp       = &args,
1936                 .rpc_resp       = &res,
1937         };
1938         int                     status;
1939
1940         nfs_fattr_init(res.dir_attr);
1941         status = rpc_call_sync(server->client, &msg, 0);
1942         if (status == 0) {
1943                 update_changeattr(dir, &res.cinfo);
1944                 nfs_post_op_update_inode(dir, res.dir_attr);
1945         }
1946         return status;
1947 }
1948
1949 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1950 {
1951         struct nfs4_exception exception = { };
1952         int err;
1953         do {
1954                 err = nfs4_handle_exception(NFS_SERVER(dir),
1955                                 _nfs4_proc_remove(dir, name),
1956                                 &exception);
1957         } while (exception.retry);
1958         return err;
1959 }
1960
1961 struct unlink_desc {
1962         struct nfs4_remove_arg  args;
1963         struct nfs4_remove_res  res;
1964         struct nfs_fattr dir_attr;
1965 };
1966
1967 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1968                 struct qstr *name)
1969 {
1970         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1971         struct unlink_desc *up;
1972
1973         up = kmalloc(sizeof(*up), GFP_KERNEL);
1974         if (!up)
1975                 return -ENOMEM;
1976
1977         up->args.fh = NFS_FH(dir->d_inode);
1978         up->args.name = name;
1979         up->args.bitmask = server->attr_bitmask;
1980         up->res.server = server;
1981         up->res.dir_attr = &up->dir_attr;
1982
1983         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1984         msg->rpc_argp = &up->args;
1985         msg->rpc_resp = &up->res;
1986         return 0;
1987 }
1988
1989 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1990 {
1991         struct rpc_message *msg = &task->tk_msg;
1992         struct unlink_desc *up;
1993
1994         if (msg->rpc_resp != NULL) {
1995                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1996                 update_changeattr(dir->d_inode, &up->res.cinfo);
1997                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1998                 kfree(up);
1999                 msg->rpc_resp = NULL;
2000                 msg->rpc_argp = NULL;
2001         }
2002         return 0;
2003 }
2004
2005 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2006                 struct inode *new_dir, struct qstr *new_name)
2007 {
2008         struct nfs_server *server = NFS_SERVER(old_dir);
2009         struct nfs4_rename_arg arg = {
2010                 .old_dir = NFS_FH(old_dir),
2011                 .new_dir = NFS_FH(new_dir),
2012                 .old_name = old_name,
2013                 .new_name = new_name,
2014                 .bitmask = server->attr_bitmask,
2015         };
2016         struct nfs_fattr old_fattr, new_fattr;
2017         struct nfs4_rename_res res = {
2018                 .server = server,
2019                 .old_fattr = &old_fattr,
2020                 .new_fattr = &new_fattr,
2021         };
2022         struct rpc_message msg = {
2023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2024                 .rpc_argp = &arg,
2025                 .rpc_resp = &res,
2026         };
2027         int                     status;
2028
2029         nfs_fattr_init(res.old_fattr);
2030         nfs_fattr_init(res.new_fattr);
2031         status = rpc_call_sync(server->client, &msg, 0);
2032
2033         if (!status) {
2034                 update_changeattr(old_dir, &res.old_cinfo);
2035                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2036                 update_changeattr(new_dir, &res.new_cinfo);
2037                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2038         }
2039         return status;
2040 }
2041
2042 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2043                 struct inode *new_dir, struct qstr *new_name)
2044 {
2045         struct nfs4_exception exception = { };
2046         int err;
2047         do {
2048                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2049                                 _nfs4_proc_rename(old_dir, old_name,
2050                                         new_dir, new_name),
2051                                 &exception);
2052         } while (exception.retry);
2053         return err;
2054 }
2055
2056 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2057 {
2058         struct nfs_server *server = NFS_SERVER(inode);
2059         struct nfs4_link_arg arg = {
2060                 .fh     = NFS_FH(inode),
2061                 .dir_fh = NFS_FH(dir),
2062                 .name   = name,
2063                 .bitmask = server->attr_bitmask,
2064         };
2065         struct nfs_fattr fattr, dir_attr;
2066         struct nfs4_link_res res = {
2067                 .server = server,
2068                 .fattr = &fattr,
2069                 .dir_attr = &dir_attr,
2070         };
2071         struct rpc_message msg = {
2072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2073                 .rpc_argp = &arg,
2074                 .rpc_resp = &res,
2075         };
2076         int                     status;
2077
2078         nfs_fattr_init(res.fattr);
2079         nfs_fattr_init(res.dir_attr);
2080         status = rpc_call_sync(server->client, &msg, 0);
2081         if (!status) {
2082                 update_changeattr(dir, &res.cinfo);
2083                 nfs_post_op_update_inode(dir, res.dir_attr);
2084                 nfs_post_op_update_inode(inode, res.fattr);
2085         }
2086
2087         return status;
2088 }
2089
2090 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2091 {
2092         struct nfs4_exception exception = { };
2093         int err;
2094         do {
2095                 err = nfs4_handle_exception(NFS_SERVER(inode),
2096                                 _nfs4_proc_link(inode, dir, name),
2097                                 &exception);
2098         } while (exception.retry);
2099         return err;
2100 }
2101
2102 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2103                 struct page *page, unsigned int len, struct iattr *sattr)
2104 {
2105         struct nfs_server *server = NFS_SERVER(dir);
2106         struct nfs_fh fhandle;
2107         struct nfs_fattr fattr, dir_fattr;
2108         struct nfs4_create_arg arg = {
2109                 .dir_fh = NFS_FH(dir),
2110                 .server = server,
2111                 .name = &dentry->d_name,
2112                 .attrs = sattr,
2113                 .ftype = NF4LNK,
2114                 .bitmask = server->attr_bitmask,
2115         };
2116         struct nfs4_create_res res = {
2117                 .server = server,
2118                 .fh = &fhandle,
2119                 .fattr = &fattr,
2120                 .dir_fattr = &dir_fattr,
2121         };
2122         struct rpc_message msg = {
2123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2124                 .rpc_argp = &arg,
2125                 .rpc_resp = &res,
2126         };
2127         int                     status;
2128
2129         if (len > NFS4_MAXPATHLEN)
2130                 return -ENAMETOOLONG;
2131
2132         arg.u.symlink.pages = &page;
2133         arg.u.symlink.len = len;
2134         nfs_fattr_init(&fattr);
2135         nfs_fattr_init(&dir_fattr);
2136
2137         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2138         if (!status) {
2139                 update_changeattr(dir, &res.dir_cinfo);
2140                 nfs_post_op_update_inode(dir, res.dir_fattr);
2141                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2142         }
2143         return status;
2144 }
2145
2146 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2147                 struct page *page, unsigned int len, struct iattr *sattr)
2148 {
2149         struct nfs4_exception exception = { };
2150         int err;
2151         do {
2152                 err = nfs4_handle_exception(NFS_SERVER(dir),
2153                                 _nfs4_proc_symlink(dir, dentry, page,
2154                                                         len, sattr),
2155                                 &exception);
2156         } while (exception.retry);
2157         return err;
2158 }
2159
2160 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2161                 struct iattr *sattr)
2162 {
2163         struct nfs_server *server = NFS_SERVER(dir);
2164         struct nfs_fh fhandle;
2165         struct nfs_fattr fattr, dir_fattr;
2166         struct nfs4_create_arg arg = {
2167                 .dir_fh = NFS_FH(dir),
2168                 .server = server,
2169                 .name = &dentry->d_name,
2170                 .attrs = sattr,
2171                 .ftype = NF4DIR,
2172                 .bitmask = server->attr_bitmask,
2173         };
2174         struct nfs4_create_res res = {
2175                 .server = server,
2176                 .fh = &fhandle,
2177                 .fattr = &fattr,
2178                 .dir_fattr = &dir_fattr,
2179         };
2180         struct rpc_message msg = {
2181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2182                 .rpc_argp = &arg,
2183                 .rpc_resp = &res,
2184         };
2185         int                     status;
2186
2187         nfs_fattr_init(&fattr);
2188         nfs_fattr_init(&dir_fattr);
2189
2190         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2191         if (!status) {
2192                 update_changeattr(dir, &res.dir_cinfo);
2193                 nfs_post_op_update_inode(dir, res.dir_fattr);
2194                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2195         }
2196         return status;
2197 }
2198
2199 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2200                 struct iattr *sattr)
2201 {
2202         struct nfs4_exception exception = { };
2203         int err;
2204         do {
2205                 err = nfs4_handle_exception(NFS_SERVER(dir),
2206                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2207                                 &exception);
2208         } while (exception.retry);
2209         return err;
2210 }
2211
2212 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2213                   u64 cookie, struct page *page, unsigned int count, int plus)
2214 {
2215         struct inode            *dir = dentry->d_inode;
2216         struct nfs4_readdir_arg args = {
2217                 .fh = NFS_FH(dir),
2218                 .pages = &page,
2219                 .pgbase = 0,
2220                 .count = count,
2221                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2222         };
2223         struct nfs4_readdir_res res;
2224         struct rpc_message msg = {
2225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2226                 .rpc_argp = &args,
2227                 .rpc_resp = &res,
2228                 .rpc_cred = cred,
2229         };
2230         int                     status;
2231
2232         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2233                         dentry->d_parent->d_name.name,
2234                         dentry->d_name.name,
2235                         (unsigned long long)cookie);
2236         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2237         res.pgbase = args.pgbase;
2238         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2239         if (status == 0)
2240                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2241         dprintk("%s: returns %d\n", __FUNCTION__, status);
2242         return status;
2243 }
2244
2245 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2246                   u64 cookie, struct page *page, unsigned int count, int plus)
2247 {
2248         struct nfs4_exception exception = { };
2249         int err;
2250         do {
2251                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2252                                 _nfs4_proc_readdir(dentry, cred, cookie,
2253                                         page, count, plus),
2254                                 &exception);
2255         } while (exception.retry);
2256         return err;
2257 }
2258
2259 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2260                 struct iattr *sattr, dev_t rdev)
2261 {
2262         struct nfs_server *server = NFS_SERVER(dir);
2263         struct nfs_fh fh;
2264         struct nfs_fattr fattr, dir_fattr;
2265         struct nfs4_create_arg arg = {
2266                 .dir_fh = NFS_FH(dir),
2267                 .server = server,
2268                 .name = &dentry->d_name,
2269                 .attrs = sattr,
2270                 .bitmask = server->attr_bitmask,
2271         };
2272         struct nfs4_create_res res = {
2273                 .server = server,
2274                 .fh = &fh,
2275                 .fattr = &fattr,
2276                 .dir_fattr = &dir_fattr,
2277         };
2278         struct rpc_message msg = {
2279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2280                 .rpc_argp = &arg,
2281                 .rpc_resp = &res,
2282         };
2283         int                     status;
2284         int                     mode = sattr->ia_mode;
2285
2286         nfs_fattr_init(&fattr);
2287         nfs_fattr_init(&dir_fattr);
2288
2289         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2290         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2291         if (S_ISFIFO(mode))
2292                 arg.ftype = NF4FIFO;
2293         else if (S_ISBLK(mode)) {
2294                 arg.ftype = NF4BLK;
2295                 arg.u.device.specdata1 = MAJOR(rdev);
2296                 arg.u.device.specdata2 = MINOR(rdev);
2297         }
2298         else if (S_ISCHR(mode)) {
2299                 arg.ftype = NF4CHR;
2300                 arg.u.device.specdata1 = MAJOR(rdev);
2301                 arg.u.device.specdata2 = MINOR(rdev);
2302         }
2303         else
2304                 arg.ftype = NF4SOCK;
2305
2306         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2307         if (status == 0) {
2308                 update_changeattr(dir, &res.dir_cinfo);
2309                 nfs_post_op_update_inode(dir, res.dir_fattr);
2310                 status = nfs_instantiate(dentry, &fh, &fattr);
2311         }
2312         return status;
2313 }
2314
2315 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2316                 struct iattr *sattr, dev_t rdev)
2317 {
2318         struct nfs4_exception exception = { };
2319         int err;
2320         do {
2321                 err = nfs4_handle_exception(NFS_SERVER(dir),
2322                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2323                                 &exception);
2324         } while (exception.retry);
2325         return err;
2326 }
2327
2328 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2329                  struct nfs_fsstat *fsstat)
2330 {
2331         struct nfs4_statfs_arg args = {
2332                 .fh = fhandle,
2333                 .bitmask = server->attr_bitmask,
2334         };
2335         struct rpc_message msg = {
2336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2337                 .rpc_argp = &args,
2338                 .rpc_resp = fsstat,
2339         };
2340
2341         nfs_fattr_init(fsstat->fattr);
2342         return rpc_call_sync(server->client, &msg, 0);
2343 }
2344
2345 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2346 {
2347         struct nfs4_exception exception = { };
2348         int err;
2349         do {
2350                 err = nfs4_handle_exception(server,
2351                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2352                                 &exception);
2353         } while (exception.retry);
2354         return err;
2355 }
2356
2357 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2358                 struct nfs_fsinfo *fsinfo)
2359 {
2360         struct nfs4_fsinfo_arg args = {
2361                 .fh = fhandle,
2362                 .bitmask = server->attr_bitmask,
2363         };
2364         struct rpc_message msg = {
2365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2366                 .rpc_argp = &args,
2367                 .rpc_resp = fsinfo,
2368         };
2369
2370         return rpc_call_sync(server->client, &msg, 0);
2371 }
2372
2373 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2374 {
2375         struct nfs4_exception exception = { };
2376         int err;
2377
2378         do {
2379                 err = nfs4_handle_exception(server,
2380                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2381                                 &exception);
2382         } while (exception.retry);
2383         return err;
2384 }
2385
2386 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2387 {
2388         nfs_fattr_init(fsinfo->fattr);
2389         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2390 }
2391
2392 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2393                 struct nfs_pathconf *pathconf)
2394 {
2395         struct nfs4_pathconf_arg args = {
2396                 .fh = fhandle,
2397                 .bitmask = server->attr_bitmask,
2398         };
2399         struct rpc_message msg = {
2400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2401                 .rpc_argp = &args,
2402                 .rpc_resp = pathconf,
2403         };
2404
2405         /* None of the pathconf attributes are mandatory to implement */
2406         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2407                 memset(pathconf, 0, sizeof(*pathconf));
2408                 return 0;
2409         }
2410
2411         nfs_fattr_init(pathconf->fattr);
2412         return rpc_call_sync(server->client, &msg, 0);
2413 }
2414
2415 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2416                 struct nfs_pathconf *pathconf)
2417 {
2418         struct nfs4_exception exception = { };
2419         int err;
2420
2421         do {
2422                 err = nfs4_handle_exception(server,
2423                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2424                                 &exception);
2425         } while (exception.retry);
2426         return err;
2427 }
2428
2429 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2430 {
2431         struct nfs_server *server = NFS_SERVER(data->inode);
2432
2433         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2434                 rpc_restart_call(task);
2435                 return -EAGAIN;
2436         }
2437         if (task->tk_status > 0)
2438                 renew_lease(server, data->timestamp);
2439         return 0;
2440 }
2441
2442 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2443 {
2444         struct rpc_message msg = {
2445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2446                 .rpc_argp = &data->args,
2447                 .rpc_resp = &data->res,
2448                 .rpc_cred = data->cred,
2449         };
2450
2451         data->timestamp   = jiffies;
2452
2453         rpc_call_setup(&data->task, &msg, 0);
2454 }
2455
2456 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2457 {
2458         struct inode *inode = data->inode;
2459
2460         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2461                 rpc_restart_call(task);
2462                 return -EAGAIN;
2463         }
2464         if (task->tk_status >= 0) {
2465                 renew_lease(NFS_SERVER(inode), data->timestamp);
2466                 nfs_post_op_update_inode(inode, data->res.fattr);
2467         }
2468         return 0;
2469 }
2470
2471 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2472 {
2473         struct rpc_message msg = {
2474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2475                 .rpc_argp = &data->args,
2476                 .rpc_resp = &data->res,
2477                 .rpc_cred = data->cred,
2478         };
2479         struct inode *inode = data->inode;
2480         struct nfs_server *server = NFS_SERVER(inode);
2481         int stable;
2482
2483         if (how & FLUSH_STABLE) {
2484                 if (!NFS_I(inode)->ncommit)
2485                         stable = NFS_FILE_SYNC;
2486                 else
2487                         stable = NFS_DATA_SYNC;
2488         } else
2489                 stable = NFS_UNSTABLE;
2490         data->args.stable = stable;
2491         data->args.bitmask = server->attr_bitmask;
2492         data->res.server = server;
2493
2494         data->timestamp   = jiffies;
2495
2496         /* Finalize the task. */
2497         rpc_call_setup(&data->task, &msg, 0);
2498 }
2499
2500 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2501 {
2502         struct inode *inode = data->inode;
2503
2504         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2505                 rpc_restart_call(task);
2506                 return -EAGAIN;
2507         }
2508         if (task->tk_status >= 0)
2509                 nfs_post_op_update_inode(inode, data->res.fattr);
2510         return 0;
2511 }
2512
2513 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2514 {
2515         struct rpc_message msg = {
2516                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2517                 .rpc_argp = &data->args,
2518                 .rpc_resp = &data->res,
2519                 .rpc_cred = data->cred,
2520         };
2521         struct nfs_server *server = NFS_SERVER(data->inode);
2522
2523         data->args.bitmask = server->attr_bitmask;
2524         data->res.server = server;
2525
2526         rpc_call_setup(&data->task, &msg, 0);
2527 }
2528
2529 /*
2530  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2531  * standalone procedure for queueing an asynchronous RENEW.
2532  */
2533 static void nfs4_renew_done(struct rpc_task *task, void *data)
2534 {
2535         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2536         unsigned long timestamp = (unsigned long)data;
2537
2538         if (task->tk_status < 0) {
2539                 switch (task->tk_status) {
2540                         case -NFS4ERR_STALE_CLIENTID:
2541                         case -NFS4ERR_EXPIRED:
2542                         case -NFS4ERR_CB_PATH_DOWN:
2543                                 nfs4_schedule_state_recovery(clp);
2544                 }
2545                 return;
2546         }
2547         spin_lock(&clp->cl_lock);
2548         if (time_before(clp->cl_last_renewal,timestamp))
2549                 clp->cl_last_renewal = timestamp;
2550         spin_unlock(&clp->cl_lock);
2551 }
2552
2553 static const struct rpc_call_ops nfs4_renew_ops = {
2554         .rpc_call_done = nfs4_renew_done,
2555 };
2556
2557 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2558 {
2559         struct rpc_message msg = {
2560                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2561                 .rpc_argp       = clp,
2562                 .rpc_cred       = cred,
2563         };
2564
2565         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2566                         &nfs4_renew_ops, (void *)jiffies);
2567 }
2568
2569 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2570 {
2571         struct rpc_message msg = {
2572                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2573                 .rpc_argp       = clp,
2574                 .rpc_cred       = cred,
2575         };
2576         unsigned long now = jiffies;
2577         int status;
2578
2579         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2580         if (status < 0)
2581                 return status;
2582         spin_lock(&clp->cl_lock);
2583         if (time_before(clp->cl_last_renewal,now))
2584                 clp->cl_last_renewal = now;
2585         spin_unlock(&clp->cl_lock);
2586         return 0;
2587 }
2588
2589 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2590 {
2591         return (server->caps & NFS_CAP_ACLS)
2592                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2593                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2594 }
2595
2596 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2597  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2598  * the stack.
2599  */
2600 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2601
2602 static void buf_to_pages(const void *buf, size_t buflen,
2603                 struct page **pages, unsigned int *pgbase)
2604 {
2605         const void *p = buf;
2606
2607         *pgbase = offset_in_page(buf);
2608         p -= *pgbase;
2609         while (p < buf + buflen) {
2610                 *(pages++) = virt_to_page(p);
2611                 p += PAGE_CACHE_SIZE;
2612         }
2613 }
2614
2615 struct nfs4_cached_acl {
2616         int cached;
2617         size_t len;
2618         char data[0];
2619 };
2620
2621 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2622 {
2623         struct nfs_inode *nfsi = NFS_I(inode);
2624
2625         spin_lock(&inode->i_lock);
2626         kfree(nfsi->nfs4_acl);
2627         nfsi->nfs4_acl = acl;
2628         spin_unlock(&inode->i_lock);
2629 }
2630
2631 static void nfs4_zap_acl_attr(struct inode *inode)
2632 {
2633         nfs4_set_cached_acl(inode, NULL);
2634 }
2635
2636 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2637 {
2638         struct nfs_inode *nfsi = NFS_I(inode);
2639         struct nfs4_cached_acl *acl;
2640         int ret = -ENOENT;
2641
2642         spin_lock(&inode->i_lock);
2643         acl = nfsi->nfs4_acl;
2644         if (acl == NULL)
2645                 goto out;
2646         if (buf == NULL) /* user is just asking for length */
2647                 goto out_len;
2648         if (acl->cached == 0)
2649                 goto out;
2650         ret = -ERANGE; /* see getxattr(2) man page */
2651         if (acl->len > buflen)
2652                 goto out;
2653         memcpy(buf, acl->data, acl->len);
2654 out_len:
2655         ret = acl->len;
2656 out:
2657         spin_unlock(&inode->i_lock);
2658         return ret;
2659 }
2660
2661 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2662 {
2663         struct nfs4_cached_acl *acl;
2664
2665         if (buf && acl_len <= PAGE_SIZE) {
2666                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2667                 if (acl == NULL)
2668                         goto out;
2669                 acl->cached = 1;
2670                 memcpy(acl->data, buf, acl_len);
2671         } else {
2672                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2673                 if (acl == NULL)
2674                         goto out;
2675                 acl->cached = 0;
2676         }
2677         acl->len = acl_len;
2678 out:
2679         nfs4_set_cached_acl(inode, acl);
2680 }
2681
2682 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2683 {
2684         struct page *pages[NFS4ACL_MAXPAGES];
2685         struct nfs_getaclargs args = {
2686                 .fh = NFS_FH(inode),
2687                 .acl_pages = pages,
2688                 .acl_len = buflen,
2689         };
2690         size_t resp_len = buflen;
2691         void *resp_buf;
2692         struct rpc_message msg = {
2693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2694                 .rpc_argp = &args,
2695                 .rpc_resp = &resp_len,
2696         };
2697         struct page *localpage = NULL;
2698         int ret;
2699
2700         if (buflen < PAGE_SIZE) {
2701                 /* As long as we're doing a round trip to the server anyway,
2702                  * let's be prepared for a page of acl data. */
2703                 localpage = alloc_page(GFP_KERNEL);
2704                 resp_buf = page_address(localpage);
2705                 if (localpage == NULL)
2706                         return -ENOMEM;
2707                 args.acl_pages[0] = localpage;
2708                 args.acl_pgbase = 0;
2709                 resp_len = args.acl_len = PAGE_SIZE;
2710         } else {
2711                 resp_buf = buf;
2712                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2713         }
2714         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2715         if (ret)
2716                 goto out_free;
2717         if (resp_len > args.acl_len)
2718                 nfs4_write_cached_acl(inode, NULL, resp_len);
2719         else
2720                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2721         if (buf) {
2722                 ret = -ERANGE;
2723                 if (resp_len > buflen)
2724                         goto out_free;
2725                 if (localpage)
2726                         memcpy(buf, resp_buf, resp_len);
2727         }
2728         ret = resp_len;
2729 out_free:
2730         if (localpage)
2731                 __free_page(localpage);
2732         return ret;
2733 }
2734
2735 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2736 {
2737         struct nfs4_exception exception = { };
2738         ssize_t ret;
2739         do {
2740                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2741                 if (ret >= 0)
2742                         break;
2743                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2744         } while (exception.retry);
2745         return ret;
2746 }
2747
2748 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2749 {
2750         struct nfs_server *server = NFS_SERVER(inode);
2751         int ret;
2752
2753         if (!nfs4_server_supports_acls(server))
2754                 return -EOPNOTSUPP;
2755         ret = nfs_revalidate_inode(server, inode);
2756         if (ret < 0)
2757                 return ret;
2758         ret = nfs4_read_cached_acl(inode, buf, buflen);
2759         if (ret != -ENOENT)
2760                 return ret;
2761         return nfs4_get_acl_uncached(inode, buf, buflen);
2762 }
2763
2764 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2765 {
2766         struct nfs_server *server = NFS_SERVER(inode);
2767         struct page *pages[NFS4ACL_MAXPAGES];
2768         struct nfs_setaclargs arg = {
2769                 .fh             = NFS_FH(inode),
2770                 .acl_pages      = pages,
2771                 .acl_len        = buflen,
2772         };
2773         struct rpc_message msg = {
2774                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2775                 .rpc_argp       = &arg,
2776                 .rpc_resp       = NULL,
2777         };
2778         int ret;
2779
2780         if (!nfs4_server_supports_acls(server))
2781                 return -EOPNOTSUPP;
2782         nfs_inode_return_delegation(inode);
2783         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2784         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2785         nfs_zap_caches(inode);
2786         return ret;
2787 }
2788
2789 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2790 {
2791         struct nfs4_exception exception = { };
2792         int err;
2793         do {
2794                 err = nfs4_handle_exception(NFS_SERVER(inode),
2795                                 __nfs4_proc_set_acl(inode, buf, buflen),
2796                                 &exception);
2797         } while (exception.retry);
2798         return err;
2799 }
2800
2801 static int
2802 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2803 {
2804         struct nfs_client *clp = server->nfs_client;
2805
2806         if (!clp || task->tk_status >= 0)
2807                 return 0;
2808         switch(task->tk_status) {
2809                 case -NFS4ERR_STALE_CLIENTID:
2810                 case -NFS4ERR_STALE_STATEID:
2811                 case -NFS4ERR_EXPIRED:
2812                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2813                         nfs4_schedule_state_recovery(clp);
2814                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2815                                 rpc_wake_up_task(task);
2816                         task->tk_status = 0;
2817                         return -EAGAIN;
2818                 case -NFS4ERR_DELAY:
2819                         nfs_inc_server_stats((struct nfs_server *) server,
2820                                                 NFSIOS_DELAY);
2821                 case -NFS4ERR_GRACE:
2822                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2823                         task->tk_status = 0;
2824                         return -EAGAIN;
2825                 case -NFS4ERR_OLD_STATEID:
2826                         task->tk_status = 0;
2827                         return -EAGAIN;
2828         }
2829         task->tk_status = nfs4_map_errors(task->tk_status);
2830         return 0;
2831 }
2832
2833 static int nfs4_wait_bit_interruptible(void *word)
2834 {
2835         if (signal_pending(current))
2836                 return -ERESTARTSYS;
2837         schedule();
2838         return 0;
2839 }
2840
2841 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2842 {
2843         sigset_t oldset;
2844         int res;
2845
2846         might_sleep();
2847
2848         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2849
2850         rpc_clnt_sigmask(clnt, &oldset);
2851         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2852                         nfs4_wait_bit_interruptible,
2853                         TASK_INTERRUPTIBLE);
2854         rpc_clnt_sigunmask(clnt, &oldset);
2855
2856         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2857         return res;
2858 }
2859
2860 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2861 {
2862         sigset_t oldset;
2863         int res = 0;
2864
2865         might_sleep();
2866
2867         if (*timeout <= 0)
2868                 *timeout = NFS4_POLL_RETRY_MIN;
2869         if (*timeout > NFS4_POLL_RETRY_MAX)
2870                 *timeout = NFS4_POLL_RETRY_MAX;
2871         rpc_clnt_sigmask(clnt, &oldset);
2872         if (clnt->cl_intr) {
2873                 schedule_timeout_interruptible(*timeout);
2874                 if (signalled())
2875                         res = -ERESTARTSYS;
2876         } else
2877                 schedule_timeout_uninterruptible(*timeout);
2878         rpc_clnt_sigunmask(clnt, &oldset);
2879         *timeout <<= 1;
2880         return res;
2881 }
2882
2883 /* This is the error handling routine for processes that are allowed
2884  * to sleep.
2885  */
2886 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2887 {
2888         struct nfs_client *clp = server->nfs_client;
2889         int ret = errorcode;
2890
2891         exception->retry = 0;
2892         switch(errorcode) {
2893                 case 0:
2894                         return 0;
2895                 case -NFS4ERR_STALE_CLIENTID:
2896                 case -NFS4ERR_STALE_STATEID:
2897                 case -NFS4ERR_EXPIRED:
2898                         nfs4_schedule_state_recovery(clp);
2899                         ret = nfs4_wait_clnt_recover(server->client, clp);
2900                         if (ret == 0)
2901                                 exception->retry = 1;
2902                         break;
2903                 case -NFS4ERR_FILE_OPEN:
2904                 case -NFS4ERR_GRACE:
2905                 case -NFS4ERR_DELAY:
2906                         ret = nfs4_delay(server->client, &exception->timeout);
2907                         if (ret != 0)
2908                                 break;
2909                 case -NFS4ERR_OLD_STATEID:
2910                         exception->retry = 1;
2911         }
2912         /* We failed to handle the error */
2913         return nfs4_map_errors(ret);
2914 }
2915
2916 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2917 {
2918         nfs4_verifier sc_verifier;
2919         struct nfs4_setclientid setclientid = {
2920                 .sc_verifier = &sc_verifier,
2921                 .sc_prog = program,
2922         };
2923         struct rpc_message msg = {
2924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2925                 .rpc_argp = &setclientid,
2926                 .rpc_resp = clp,
2927                 .rpc_cred = cred,
2928         };
2929         __be32 *p;
2930         int loop = 0;
2931         int status;
2932
2933         p = (__be32*)sc_verifier.data;
2934         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2935         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2936
2937         for(;;) {
2938                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2939                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2940                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2941                                 cred->cr_ops->cr_name,
2942                                 clp->cl_id_uniquifier);
2943                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2944                                 sizeof(setclientid.sc_netid), "tcp");
2945                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2946                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2947                                 clp->cl_ipaddr, port >> 8, port & 255);
2948
2949                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2950                 if (status != -NFS4ERR_CLID_INUSE)
2951                         break;
2952                 if (signalled())
2953                         break;
2954                 if (loop++ & 1)
2955                         ssleep(clp->cl_lease_time + 1);
2956                 else
2957                         if (++clp->cl_id_uniquifier == 0)
2958                                 break;
2959         }
2960         return status;
2961 }
2962
2963 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2964 {
2965         struct nfs_fsinfo fsinfo;
2966         struct rpc_message msg = {
2967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2968                 .rpc_argp = clp,
2969                 .rpc_resp = &fsinfo,
2970                 .rpc_cred = cred,
2971         };
2972         unsigned long now;
2973         int status;
2974
2975         now = jiffies;
2976         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2977         if (status == 0) {
2978                 spin_lock(&clp->cl_lock);
2979                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2980                 clp->cl_last_renewal = now;
2981                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2982                 spin_unlock(&clp->cl_lock);
2983         }
2984         return status;
2985 }
2986
2987 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2988 {
2989         long timeout;
2990         int err;
2991         do {
2992                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2993                 switch (err) {
2994                         case 0:
2995                                 return err;
2996                         case -NFS4ERR_RESOURCE:
2997                                 /* The IBM lawyers misread another document! */
2998                         case -NFS4ERR_DELAY:
2999                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3000                 }
3001         } while (err == 0);
3002         return err;
3003 }
3004
3005 struct nfs4_delegreturndata {
3006         struct nfs4_delegreturnargs args;
3007         struct nfs4_delegreturnres res;
3008         struct nfs_fh fh;
3009         nfs4_stateid stateid;
3010         struct rpc_cred *cred;
3011         unsigned long timestamp;
3012         struct nfs_fattr fattr;
3013         int rpc_status;
3014 };
3015
3016 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3017 {
3018         struct nfs4_delegreturndata *data = calldata;
3019         struct rpc_message msg = {
3020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3021                 .rpc_argp = &data->args,
3022                 .rpc_resp = &data->res,
3023                 .rpc_cred = data->cred,
3024         };
3025         nfs_fattr_init(data->res.fattr);
3026         rpc_call_setup(task, &msg, 0);
3027 }
3028
3029 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3030 {
3031         struct nfs4_delegreturndata *data = calldata;
3032         data->rpc_status = task->tk_status;
3033         if (data->rpc_status == 0)
3034                 renew_lease(data->res.server, data->timestamp);
3035 }
3036
3037 static void nfs4_delegreturn_release(void *calldata)
3038 {
3039         struct nfs4_delegreturndata *data = calldata;
3040
3041         put_rpccred(data->cred);
3042         kfree(calldata);
3043 }
3044
3045 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3046         .rpc_call_prepare = nfs4_delegreturn_prepare,
3047         .rpc_call_done = nfs4_delegreturn_done,
3048         .rpc_release = nfs4_delegreturn_release,
3049 };
3050
3051 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3052 {
3053         struct nfs4_delegreturndata *data;
3054         struct nfs_server *server = NFS_SERVER(inode);
3055         struct rpc_task *task;
3056         int status;
3057
3058         data = kmalloc(sizeof(*data), GFP_KERNEL);
3059         if (data == NULL)
3060                 return -ENOMEM;
3061         data->args.fhandle = &data->fh;
3062         data->args.stateid = &data->stateid;
3063         data->args.bitmask = server->attr_bitmask;
3064         nfs_copy_fh(&data->fh, NFS_FH(inode));
3065         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3066         data->res.fattr = &data->fattr;
3067         data->res.server = server;
3068         data->cred = get_rpccred(cred);
3069         data->timestamp = jiffies;
3070         data->rpc_status = 0;
3071
3072         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3073         if (IS_ERR(task))
3074                 return PTR_ERR(task);
3075         status = nfs4_wait_for_completion_rpc_task(task);
3076         if (status == 0) {
3077                 status = data->rpc_status;
3078                 if (status == 0)
3079                         nfs_post_op_update_inode(inode, &data->fattr);
3080         }
3081         rpc_put_task(task);
3082         return status;
3083 }
3084
3085 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3086 {
3087         struct nfs_server *server = NFS_SERVER(inode);
3088         struct nfs4_exception exception = { };
3089         int err;
3090         do {
3091                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3092                 switch (err) {
3093                         case -NFS4ERR_STALE_STATEID:
3094                         case -NFS4ERR_EXPIRED:
3095                         case 0:
3096                                 return 0;
3097                 }
3098                 err = nfs4_handle_exception(server, err, &exception);
3099         } while (exception.retry);
3100         return err;
3101 }
3102
3103 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3104 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3105
3106 /*
3107  * sleep, with exponential backoff, and retry the LOCK operation.
3108  */
3109 static unsigned long
3110 nfs4_set_lock_task_retry(unsigned long timeout)
3111 {
3112         schedule_timeout_interruptible(timeout);
3113         timeout <<= 1;
3114         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3115                 return NFS4_LOCK_MAXTIMEOUT;
3116         return timeout;
3117 }
3118
3119 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3120 {
3121         struct inode *inode = state->inode;
3122         struct nfs_server *server = NFS_SERVER(inode);
3123         struct nfs_client *clp = server->nfs_client;
3124         struct nfs_lockt_args arg = {
3125                 .fh = NFS_FH(inode),
3126                 .fl = request,
3127         };
3128         struct nfs_lockt_res res = {
3129                 .denied = request,
3130         };
3131         struct rpc_message msg = {
3132                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3133                 .rpc_argp       = &arg,
3134                 .rpc_resp       = &res,
3135                 .rpc_cred       = state->owner->so_cred,
3136         };
3137         struct nfs4_lock_state *lsp;
3138         int status;
3139
3140         down_read(&clp->cl_sem);
3141         arg.lock_owner.clientid = clp->cl_clientid;
3142         status = nfs4_set_lock_state(state, request);
3143         if (status != 0)
3144                 goto out;
3145         lsp = request->fl_u.nfs4_fl.owner;
3146         arg.lock_owner.id = lsp->ls_id.id;
3147         status = rpc_call_sync(server->client, &msg, 0);
3148         switch (status) {
3149                 case 0:
3150                         request->fl_type = F_UNLCK;
3151                         break;
3152                 case -NFS4ERR_DENIED:
3153                         status = 0;
3154         }
3155         request->fl_ops->fl_release_private(request);
3156 out:
3157         up_read(&clp->cl_sem);
3158         return status;
3159 }
3160
3161 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3162 {
3163         struct nfs4_exception exception = { };
3164         int err;
3165
3166         do {
3167                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3168                                 _nfs4_proc_getlk(state, cmd, request),
3169                                 &exception);
3170         } while (exception.retry);
3171         return err;
3172 }
3173
3174 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3175 {
3176         int res = 0;
3177         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3178                 case FL_POSIX:
3179                         res = posix_lock_file_wait(file, fl);
3180                         break;
3181                 case FL_FLOCK:
3182                         res = flock_lock_file_wait(file, fl);
3183                         break;
3184                 default:
3185                         BUG();
3186         }
3187         return res;
3188 }
3189
3190 struct nfs4_unlockdata {
3191         struct nfs_locku_args arg;
3192         struct nfs_locku_res res;
3193         struct nfs4_lock_state *lsp;
3194         struct nfs_open_context *ctx;
3195         struct file_lock fl;
3196         const struct nfs_server *server;
3197         unsigned long timestamp;
3198 };
3199
3200 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3201                 struct nfs_open_context *ctx,
3202                 struct nfs4_lock_state *lsp,
3203                 struct nfs_seqid *seqid)
3204 {
3205         struct nfs4_unlockdata *p;
3206         struct inode *inode = lsp->ls_state->inode;
3207
3208         p = kmalloc(sizeof(*p), GFP_KERNEL);
3209         if (p == NULL)
3210                 return NULL;
3211         p->arg.fh = NFS_FH(inode);
3212         p->arg.fl = &p->fl;
3213         p->arg.seqid = seqid;
3214         p->arg.stateid = &lsp->ls_stateid;
3215         p->lsp = lsp;
3216         atomic_inc(&lsp->ls_count);
3217         /* Ensure we don't close file until we're done freeing locks! */
3218         p->ctx = get_nfs_open_context(ctx);
3219         memcpy(&p->fl, fl, sizeof(p->fl));
3220         p->server = NFS_SERVER(inode);
3221         return p;
3222 }
3223
3224 static void nfs4_locku_release_calldata(void *data)
3225 {
3226         struct nfs4_unlockdata *calldata = data;
3227         nfs_free_seqid(calldata->arg.seqid);
3228         nfs4_put_lock_state(calldata->lsp);
3229         put_nfs_open_context(calldata->ctx);
3230         kfree(calldata);
3231 }
3232
3233 static void nfs4_locku_done(struct rpc_task *task, void *data)
3234 {
3235         struct nfs4_unlockdata *calldata = data;
3236
3237         if (RPC_ASSASSINATED(task))
3238                 return;
3239         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3240         switch (task->tk_status) {
3241                 case 0:
3242                         memcpy(calldata->lsp->ls_stateid.data,
3243                                         calldata->res.stateid.data,
3244                                         sizeof(calldata->lsp->ls_stateid.data));
3245                         renew_lease(calldata->server, calldata->timestamp);
3246                         break;
3247                 case -NFS4ERR_STALE_STATEID:
3248                 case -NFS4ERR_EXPIRED:
3249                         break;
3250                 default:
3251                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3252                                 rpc_restart_call(task);
3253         }
3254 }
3255
3256 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3257 {
3258         struct nfs4_unlockdata *calldata = data;
3259         struct rpc_message msg = {
3260                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3261                 .rpc_argp       = &calldata->arg,
3262                 .rpc_resp       = &calldata->res,
3263                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3264         };
3265
3266         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3267                 return;
3268         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3269                 /* Note: exit _without_ running nfs4_locku_done */
3270                 task->tk_action = NULL;
3271                 return;
3272         }
3273         calldata->timestamp = jiffies;
3274         rpc_call_setup(task, &msg, 0);
3275 }
3276
3277 static const struct rpc_call_ops nfs4_locku_ops = {
3278         .rpc_call_prepare = nfs4_locku_prepare,
3279         .rpc_call_done = nfs4_locku_done,
3280         .rpc_release = nfs4_locku_release_calldata,
3281 };
3282
3283 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3284                 struct nfs_open_context *ctx,
3285                 struct nfs4_lock_state *lsp,
3286                 struct nfs_seqid *seqid)
3287 {
3288         struct nfs4_unlockdata *data;
3289
3290         /* Ensure this is an unlock - when canceling a lock, the
3291          * canceled lock is passed in, and it won't be an unlock.
3292          */
3293         fl->fl_type = F_UNLCK;
3294
3295         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3296         if (data == NULL) {
3297                 nfs_free_seqid(seqid);
3298                 return ERR_PTR(-ENOMEM);
3299         }
3300
3301         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3302 }
3303
3304 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3305 {
3306         struct nfs_seqid *seqid;
3307         struct nfs4_lock_state *lsp;
3308         struct rpc_task *task;
3309         int status = 0;
3310
3311         status = nfs4_set_lock_state(state, request);
3312         /* Unlock _before_ we do the RPC call */
3313         request->fl_flags |= FL_EXISTS;
3314         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3315                 goto out;
3316         if (status != 0)
3317                 goto out;
3318         /* Is this a delegated lock? */
3319         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3320                 goto out;
3321         lsp = request->fl_u.nfs4_fl.owner;
3322         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3323         status = -ENOMEM;
3324         if (seqid == NULL)
3325                 goto out;
3326         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3327         status = PTR_ERR(task);
3328         if (IS_ERR(task))
3329                 goto out;
3330         status = nfs4_wait_for_completion_rpc_task(task);
3331         rpc_put_task(task);
3332 out:
3333         return status;
3334 }
3335
3336 struct nfs4_lockdata {
3337         struct nfs_lock_args arg;
3338         struct nfs_lock_res res;
3339         struct nfs4_lock_state *lsp;
3340         struct nfs_open_context *ctx;
3341         struct file_lock fl;
3342         unsigned long timestamp;
3343         int rpc_status;
3344         int cancelled;
3345 };
3346
3347 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3348                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3349 {
3350         struct nfs4_lockdata *p;
3351         struct inode *inode = lsp->ls_state->inode;
3352         struct nfs_server *server = NFS_SERVER(inode);
3353
3354         p = kzalloc(sizeof(*p), GFP_KERNEL);
3355         if (p == NULL)
3356                 return NULL;
3357
3358         p->arg.fh = NFS_FH(inode);
3359         p->arg.fl = &p->fl;
3360         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3361         if (p->arg.lock_seqid == NULL)
3362                 goto out_free;
3363         p->arg.lock_stateid = &lsp->ls_stateid;
3364         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3365         p->arg.lock_owner.id = lsp->ls_id.id;
3366         p->lsp = lsp;
3367         atomic_inc(&lsp->ls_count);
3368         p->ctx = get_nfs_open_context(ctx);
3369         memcpy(&p->fl, fl, sizeof(p->fl));
3370         return p;
3371 out_free:
3372         kfree(p);
3373         return NULL;
3374 }
3375
3376 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3377 {
3378         struct nfs4_lockdata *data = calldata;
3379         struct nfs4_state *state = data->lsp->ls_state;
3380         struct nfs4_state_owner *sp = state->owner;
3381         struct rpc_message msg = {
3382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3383                 .rpc_argp = &data->arg,
3384                 .rpc_resp = &data->res,
3385                 .rpc_cred = sp->so_cred,
3386         };
3387
3388         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3389                 return;
3390         dprintk("%s: begin!\n", __FUNCTION__);
3391         /* Do we need to do an open_to_lock_owner? */
3392         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3393                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3394                 if (data->arg.open_seqid == NULL) {
3395                         data->rpc_status = -ENOMEM;
3396                         task->tk_action = NULL;
3397                         goto out;
3398                 }
3399                 data->arg.open_stateid = &state->stateid;
3400                 data->arg.new_lock_owner = 1;
3401         }
3402         data->timestamp = jiffies;
3403         rpc_call_setup(task, &msg, 0);
3404 out:
3405         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3406 }
3407
3408 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3409 {
3410         struct nfs4_lockdata *data = calldata;
3411
3412         dprintk("%s: begin!\n", __FUNCTION__);
3413
3414         data->rpc_status = task->tk_status;
3415         if (RPC_ASSASSINATED(task))
3416                 goto out;
3417         if (data->arg.new_lock_owner != 0) {
3418                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3419                 if (data->rpc_status == 0)
3420                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3421                 else
3422                         goto out;
3423         }
3424         if (data->rpc_status == 0) {
3425                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3426                                         sizeof(data->lsp->ls_stateid.data));
3427                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3428                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3429         }
3430         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3431 out:
3432         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3433 }
3434
3435 static void nfs4_lock_release(void *calldata)
3436 {
3437         struct nfs4_lockdata *data = calldata;
3438
3439         dprintk("%s: begin!\n", __FUNCTION__);
3440         if (data->arg.open_seqid != NULL)
3441                 nfs_free_seqid(data->arg.open_seqid);
3442         if (data->cancelled != 0) {
3443                 struct rpc_task *task;
3444                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3445                                 data->arg.lock_seqid);
3446                 if (!IS_ERR(task))
3447                         rpc_put_task(task);
3448                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3449         } else
3450                 nfs_free_seqid(data->arg.lock_seqid);
3451         nfs4_put_lock_state(data->lsp);
3452         put_nfs_open_context(data->ctx);
3453         kfree(data);
3454         dprintk("%s: done!\n", __FUNCTION__);
3455 }
3456
3457 static const struct rpc_call_ops nfs4_lock_ops = {
3458         .rpc_call_prepare = nfs4_lock_prepare,
3459         .rpc_call_done = nfs4_lock_done,
3460         .rpc_release = nfs4_lock_release,
3461 };
3462
3463 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3464 {
3465         struct nfs4_lockdata *data;
3466         struct rpc_task *task;
3467         int ret;
3468
3469         dprintk("%s: begin!\n", __FUNCTION__);
3470         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3471                         fl->fl_u.nfs4_fl.owner);
3472         if (data == NULL)
3473                 return -ENOMEM;
3474         if (IS_SETLKW(cmd))
3475                 data->arg.block = 1;
3476         if (reclaim != 0)
3477                 data->arg.reclaim = 1;
3478         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3479                         &nfs4_lock_ops, data);
3480         if (IS_ERR(task))
3481                 return PTR_ERR(task);
3482         ret = nfs4_wait_for_completion_rpc_task(task);
3483         if (ret == 0) {
3484                 ret = data->rpc_status;
3485                 if (ret == -NFS4ERR_DENIED)
3486                         ret = -EAGAIN;
3487         } else
3488                 data->cancelled = 1;
3489         rpc_put_task(task);
3490         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3491         return ret;
3492 }
3493
3494 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3495 {
3496         struct nfs_server *server = NFS_SERVER(state->inode);
3497         struct nfs4_exception exception = { };
3498         int err;
3499
3500         do {
3501                 /* Cache the lock if possible... */
3502                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3503                         return 0;
3504                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3505                 if (err != -NFS4ERR_DELAY)
3506                         break;
3507                 nfs4_handle_exception(server, err, &exception);
3508         } while (exception.retry);
3509         return err;
3510 }
3511
3512 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3513 {
3514         struct nfs_server *server = NFS_SERVER(state->inode);
3515         struct nfs4_exception exception = { };
3516         int err;
3517
3518         err = nfs4_set_lock_state(state, request);
3519         if (err != 0)
3520                 return err;
3521         do {
3522                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3523                         return 0;
3524                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3525                 if (err != -NFS4ERR_DELAY)
3526                         break;
3527                 nfs4_handle_exception(server, err, &exception);
3528         } while (exception.retry);
3529         return err;
3530 }
3531
3532 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3533 {
3534         struct nfs_client *clp = state->owner->so_client;
3535         unsigned char fl_flags = request->fl_flags;
3536         int status;
3537
3538         /* Is this a delegated open? */
3539         status = nfs4_set_lock_state(state, request);
3540         if (status != 0)
3541                 goto out;
3542         request->fl_flags |= FL_ACCESS;
3543         status = do_vfs_lock(request->fl_file, request);
3544         if (status < 0)
3545                 goto out;
3546         down_read(&clp->cl_sem);
3547         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3548                 struct nfs_inode *nfsi = NFS_I(state->inode);
3549                 /* Yes: cache locks! */
3550                 down_read(&nfsi->rwsem);
3551                 /* ...but avoid races with delegation recall... */
3552                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3553                         request->fl_flags = fl_flags & ~FL_SLEEP;
3554                         status = do_vfs_lock(request->fl_file, request);
3555                         up_read(&nfsi->rwsem);
3556                         goto out_unlock;
3557                 }
3558                 up_read(&nfsi->rwsem);
3559         }
3560         status = _nfs4_do_setlk(state, cmd, request, 0);
3561         if (status != 0)
3562                 goto out_unlock;
3563         /* Note: we always want to sleep here! */
3564         request->fl_flags = fl_flags | FL_SLEEP;
3565         if (do_vfs_lock(request->fl_file, request) < 0)
3566                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3567 out_unlock:
3568         up_read(&clp->cl_sem);
3569 out:
3570         request->fl_flags = fl_flags;
3571         return status;
3572 }
3573
3574 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3575 {
3576         struct nfs4_exception exception = { };
3577         int err;
3578
3579         do {
3580                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3581                                 _nfs4_proc_setlk(state, cmd, request),
3582                                 &exception);
3583         } while (exception.retry);
3584         return err;
3585 }
3586
3587 static int
3588 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3589 {
3590         struct nfs_open_context *ctx;
3591         struct nfs4_state *state;
3592         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3593         int status;
3594
3595         /* verify open state */
3596         ctx = (struct nfs_open_context *)filp->private_data;
3597         state = ctx->state;
3598
3599         if (request->fl_start < 0 || request->fl_end < 0)
3600                 return -EINVAL;
3601
3602         if (IS_GETLK(cmd))
3603                 return nfs4_proc_getlk(state, F_GETLK, request);
3604
3605         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3606                 return -EINVAL;
3607
3608         if (request->fl_type == F_UNLCK)
3609                 return nfs4_proc_unlck(state, cmd, request);
3610
3611         do {
3612                 status = nfs4_proc_setlk(state, cmd, request);
3613                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3614                         break;
3615                 timeout = nfs4_set_lock_task_retry(timeout);
3616                 status = -ERESTARTSYS;
3617                 if (signalled())
3618                         break;
3619         } while(status < 0);
3620         return status;
3621 }
3622
3623 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3624 {
3625         struct nfs_server *server = NFS_SERVER(state->inode);
3626         struct nfs4_exception exception = { };
3627         int err;
3628
3629         err = nfs4_set_lock_state(state, fl);
3630         if (err != 0)
3631                 goto out;
3632         do {
3633                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3634                 if (err != -NFS4ERR_DELAY)
3635                         break;
3636                 err = nfs4_handle_exception(server, err, &exception);
3637         } while (exception.retry);
3638 out:
3639         return err;
3640 }
3641
3642 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3643
3644 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3645                 size_t buflen, int flags)
3646 {
3647         struct inode *inode = dentry->d_inode;
3648
3649         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3650                 return -EOPNOTSUPP;
3651
3652         if (!S_ISREG(inode->i_mode) &&
3653             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3654                 return -EPERM;
3655
3656         return nfs4_proc_set_acl(inode, buf, buflen);
3657 }
3658
3659 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3660  * and that's what we'll do for e.g. user attributes that haven't been set.
3661  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3662  * attributes in kernel-managed attribute namespaces. */
3663 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3664                 size_t buflen)
3665 {
3666         struct inode *inode = dentry->d_inode;
3667
3668         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3669                 return -EOPNOTSUPP;
3670
3671         return nfs4_proc_get_acl(inode, buf, buflen);
3672 }
3673
3674 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3675 {
3676         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3677
3678         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3679                 return 0;
3680         if (buf && buflen < len)
3681                 return -ERANGE;
3682         if (buf)
3683                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3684         return len;
3685 }
3686
3687 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3688                 struct nfs4_fs_locations *fs_locations, struct page *page)
3689 {
3690         struct nfs_server *server = NFS_SERVER(dir);
3691         u32 bitmask[2] = {
3692                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3693                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3694         };
3695         struct nfs4_fs_locations_arg args = {
3696                 .dir_fh = NFS_FH(dir),
3697                 .name = name,
3698                 .page = page,
3699                 .bitmask = bitmask,
3700         };
3701         struct rpc_message msg = {
3702                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3703                 .rpc_argp = &args,
3704                 .rpc_resp = fs_locations,
3705         };
3706         int status;
3707
3708         dprintk("%s: start\n", __FUNCTION__);
3709         nfs_fattr_init(&fs_locations->fattr);
3710         fs_locations->server = server;
3711         fs_locations->nlocations = 0;
3712         status = rpc_call_sync(server->client, &msg, 0);
3713         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3714         return status;
3715 }
3716
3717 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3718         .recover_open   = nfs4_open_reclaim,
3719         .recover_lock   = nfs4_lock_reclaim,
3720 };
3721
3722 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3723         .recover_open   = nfs4_open_expired,
3724         .recover_lock   = nfs4_lock_expired,
3725 };
3726
3727 static const struct inode_operations nfs4_file_inode_operations = {
3728         .permission     = nfs_permission,
3729         .getattr        = nfs_getattr,
3730         .setattr        = nfs_setattr,
3731         .getxattr       = nfs4_getxattr,
3732         .setxattr       = nfs4_setxattr,
3733         .listxattr      = nfs4_listxattr,
3734 };
3735
3736 const struct nfs_rpc_ops nfs_v4_clientops = {
3737         .version        = 4,                    /* protocol version */
3738         .dentry_ops     = &nfs4_dentry_operations,
3739         .dir_inode_ops  = &nfs4_dir_inode_operations,
3740         .file_inode_ops = &nfs4_file_inode_operations,
3741         .getroot        = nfs4_proc_get_root,
3742         .getattr        = nfs4_proc_getattr,
3743         .setattr        = nfs4_proc_setattr,
3744         .lookupfh       = nfs4_proc_lookupfh,
3745         .lookup         = nfs4_proc_lookup,
3746         .access         = nfs4_proc_access,
3747         .readlink       = nfs4_proc_readlink,
3748         .create         = nfs4_proc_create,
3749         .remove         = nfs4_proc_remove,
3750         .unlink_setup   = nfs4_proc_unlink_setup,
3751         .unlink_done    = nfs4_proc_unlink_done,
3752         .rename         = nfs4_proc_rename,
3753         .link           = nfs4_proc_link,
3754         .symlink        = nfs4_proc_symlink,
3755         .mkdir          = nfs4_proc_mkdir,
3756         .rmdir          = nfs4_proc_remove,
3757         .readdir        = nfs4_proc_readdir,
3758         .mknod          = nfs4_proc_mknod,
3759         .statfs         = nfs4_proc_statfs,
3760         .fsinfo         = nfs4_proc_fsinfo,
3761         .pathconf       = nfs4_proc_pathconf,
3762         .set_capabilities = nfs4_server_capabilities,
3763         .decode_dirent  = nfs4_decode_dirent,
3764         .read_setup     = nfs4_proc_read_setup,
3765         .read_done      = nfs4_read_done,
3766         .write_setup    = nfs4_proc_write_setup,
3767         .write_done     = nfs4_write_done,
3768         .commit_setup   = nfs4_proc_commit_setup,
3769         .commit_done    = nfs4_commit_done,
3770         .file_open      = nfs_open,
3771         .file_release   = nfs_release,
3772         .lock           = nfs4_proc_lock,
3773         .clear_acl_cache = nfs4_zap_acl_attr,
3774 };
3775
3776 /*
3777  * Local variables:
3778  *  c-basic-offset: 8
3779  * End:
3780  */