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 "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  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_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70
  71 /* Prevent leaks of NFSv4 errors into userland */
  72 int nfs4_map_errors(int err)
  73 {
  74         if (err < -1000) {
  75                 dprintk("%s could not handle NFSv4 error %d\n",
  76                                 __FUNCTION__, -err);
  77                 return -EIO;
  78         }
  79         return err;
  80 }
  81
  82 /*
  83  * This is our standard bitmap for GETATTR requests.
  84  */
  85 const u32 nfs4_fattr_bitmap[2] = {
  86         FATTR4_WORD0_TYPE
  87         | FATTR4_WORD0_CHANGE
  88         | FATTR4_WORD0_SIZE
  89         | FATTR4_WORD0_FSID
  90         | FATTR4_WORD0_FILEID,
  91         FATTR4_WORD1_MODE
  92         | FATTR4_WORD1_NUMLINKS
  93         | FATTR4_WORD1_OWNER
  94         | FATTR4_WORD1_OWNER_GROUP
  95         | FATTR4_WORD1_RAWDEV
  96         | FATTR4_WORD1_SPACE_USED
  97         | FATTR4_WORD1_TIME_ACCESS
  98         | FATTR4_WORD1_TIME_METADATA
  99         | FATTR4_WORD1_TIME_MODIFY
 100 };
 101
 102 const u32 nfs4_statfs_bitmap[2] = {
 103         FATTR4_WORD0_FILES_AVAIL
 104         | FATTR4_WORD0_FILES_FREE
 105         | FATTR4_WORD0_FILES_TOTAL,
 106         FATTR4_WORD1_SPACE_AVAIL
 107         | FATTR4_WORD1_SPACE_FREE
 108         | FATTR4_WORD1_SPACE_TOTAL
 109 };
 110
 111 const u32 nfs4_pathconf_bitmap[2] = {
 112         FATTR4_WORD0_MAXLINK
 113         | FATTR4_WORD0_MAXNAME,
 114         0
 115 };
 116
 117 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 118                         | FATTR4_WORD0_MAXREAD
 119                         | FATTR4_WORD0_MAXWRITE
 120                         | FATTR4_WORD0_LEASE_TIME,
 121                         0
 122 };
 123
 124 const u32 nfs4_fs_locations_bitmap[2] = {
 125         FATTR4_WORD0_TYPE
 126         | FATTR4_WORD0_CHANGE
 127         | FATTR4_WORD0_SIZE
 128         | FATTR4_WORD0_FSID
 129         | FATTR4_WORD0_FILEID
 130         | FATTR4_WORD0_FS_LOCATIONS,
 131         FATTR4_WORD1_MODE
 132         | FATTR4_WORD1_NUMLINKS
 133         | FATTR4_WORD1_OWNER
 134         | FATTR4_WORD1_OWNER_GROUP
 135         | FATTR4_WORD1_RAWDEV
 136         | FATTR4_WORD1_SPACE_USED
 137         | FATTR4_WORD1_TIME_ACCESS
 138         | FATTR4_WORD1_TIME_METADATA
 139         | FATTR4_WORD1_TIME_MODIFY
 140         | FATTR4_WORD1_MOUNTED_ON_FILEID
 141 };
 142
 143 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 144                 struct nfs4_readdir_arg *readdir)
 145 {
 146         __be32 *start, *p;
 147
 148         BUG_ON(readdir->count < 80);
 149         if (cookie > 2) {
 150                 readdir->cookie = cookie;
 151                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 152                 return;
 153         }
 154
 155         readdir->cookie = 0;
 156         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 157         if (cookie == 2)
 158                 return;
 159
 160         /*
 161          * NFSv4 servers do not return entries for '.' and '..'
 162          * Therefore, we fake these entries here.  We let '.'
 163          * have cookie 0 and '..' have cookie 1.  Note that
 164          * when talking to the server, we always send cookie 0
 165          * instead of 1 or 2.
 166          */
 167         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 168
 169         if (cookie == 0) {
 170                 *p++ = xdr_one;                                  /* next */
 171                 *p++ = xdr_zero;                   /* cookie, first word */
 172                 *p++ = xdr_one;                   /* cookie, second word */
 173                 *p++ = xdr_one;                             /* entry len */
 174                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 175                 p++;
 176                 *p++ = xdr_one;                         /* bitmap length */
 177                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 178                 *p++ = htonl(8);              /* attribute buffer length */
 179                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 180         }
 181
 182         *p++ = xdr_one;                                  /* next */
 183         *p++ = xdr_zero;                   /* cookie, first word */
 184         *p++ = xdr_two;                   /* cookie, second word */
 185         *p++ = xdr_two;                             /* entry len */
 186         memcpy(p, "..\0\0", 4);                         /* entry */
 187         p++;
 188         *p++ = xdr_one;                         /* bitmap length */
 189         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 190         *p++ = htonl(8);              /* attribute buffer length */
 191         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 192
 193         readdir->pgbase = (char *)p - (char *)start;
 194         readdir->count -= readdir->pgbase;
 195         kunmap_atomic(start, KM_USER0);
 196 }
 197
 198 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 199 {
 200         struct nfs_client *clp = server->nfs_client;
 201         spin_lock(&clp->cl_lock);
 202         if (time_before(clp->cl_last_renewal,timestamp))
 203                 clp->cl_last_renewal = timestamp;
 204         spin_unlock(&clp->cl_lock);
 205 }
 206
 207 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 208 {
 209         struct nfs_inode *nfsi = NFS_I(dir);
 210
 211         spin_lock(&dir->i_lock);
 212         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 213         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 214                 nfs_force_lookup_revalidate(dir);
 215         nfsi->change_attr = cinfo->after;
 216         spin_unlock(&dir->i_lock);
 217 }
 218
 219 struct nfs4_opendata {
 220         struct kref kref;
 221         struct nfs_openargs o_arg;
 222         struct nfs_openres o_res;
 223         struct nfs_open_confirmargs c_arg;
 224         struct nfs_open_confirmres c_res;
 225         struct nfs_fattr f_attr;
 226         struct nfs_fattr dir_attr;
 227         struct path path;
 228         struct dentry *dir;
 229         struct nfs4_state_owner *owner;
 230         struct nfs4_state *state;
 231         struct iattr attrs;
 232         unsigned long timestamp;
 233         unsigned int rpc_done : 1;
 234         int rpc_status;
 235         int cancelled;
 236 };
 237
 238
 239 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 240 {
 241         p->o_res.f_attr = &p->f_attr;
 242         p->o_res.dir_attr = &p->dir_attr;
 243         p->o_res.server = p->o_arg.server;
 244         nfs_fattr_init(&p->f_attr);
 245         nfs_fattr_init(&p->dir_attr);
 246 }
 247
 248 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 249                 struct nfs4_state_owner *sp, int flags,
 250                 const struct iattr *attrs)
 251 {
 252         struct dentry *parent = dget_parent(path->dentry);
 253         struct inode *dir = parent->d_inode;
 254         struct nfs_server *server = NFS_SERVER(dir);
 255         struct nfs4_opendata *p;
 256
 257         p = kzalloc(sizeof(*p), GFP_KERNEL);
 258         if (p == NULL)
 259                 goto err;
 260         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 261         if (p->o_arg.seqid == NULL)
 262                 goto err_free;
 263         p->path.mnt = mntget(path->mnt);
 264         p->path.dentry = dget(path->dentry);
 265         p->dir = parent;
 266         p->owner = sp;
 267         atomic_inc(&sp->so_count);
 268         p->o_arg.fh = NFS_FH(dir);
 269         p->o_arg.open_flags = flags,
 270         p->o_arg.clientid = server->nfs_client->cl_clientid;
 271         p->o_arg.id = sp->so_owner_id.id;
 272         p->o_arg.name = &p->path.dentry->d_name;
 273         p->o_arg.server = server;
 274         p->o_arg.bitmask = server->attr_bitmask;
 275         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 276         if (flags & O_EXCL) {
 277                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 278                 s[0] = jiffies;
 279                 s[1] = current->pid;
 280         } else if (flags & O_CREAT) {
 281                 p->o_arg.u.attrs = &p->attrs;
 282                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 283         }
 284         p->c_arg.fh = &p->o_res.fh;
 285         p->c_arg.stateid = &p->o_res.stateid;
 286         p->c_arg.seqid = p->o_arg.seqid;
 287         nfs4_init_opendata_res(p);
 288         kref_init(&p->kref);
 289         return p;
 290 err_free:
 291         kfree(p);
 292 err:
 293         dput(parent);
 294         return NULL;
 295 }
 296
 297 static void nfs4_opendata_free(struct kref *kref)
 298 {
 299         struct nfs4_opendata *p = container_of(kref,
 300                         struct nfs4_opendata, kref);
 301
 302         nfs_free_seqid(p->o_arg.seqid);
 303         if (p->state != NULL)
 304                 nfs4_put_open_state(p->state);
 305         nfs4_put_state_owner(p->owner);
 306         dput(p->dir);
 307         dput(p->path.dentry);
 308         mntput(p->path.mnt);
 309         kfree(p);
 310 }
 311
 312 static void nfs4_opendata_put(struct nfs4_opendata *p)
 313 {
 314         if (p != NULL)
 315                 kref_put(&p->kref, nfs4_opendata_free);
 316 }
 317
 318 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 319 {
 320         int ret;
 321
 322         ret = rpc_wait_for_completion_task(task);
 323         return ret;
 324 }
 325
 326 static int can_open_cached(struct nfs4_state *state, int mode)
 327 {
 328         int ret = 0;
 329         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 330                 case FMODE_READ:
 331                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 332                         break;
 333                 case FMODE_WRITE:
 334                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 335                         break;
 336                 case FMODE_READ|FMODE_WRITE:
 337                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 338         }
 339         return ret;
 340 }
 341
 342 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 343 {
 344         if ((delegation->type & open_flags) != open_flags)
 345                 return 0;
 346         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 347                 return 0;
 348         return 1;
 349 }
 350
 351 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 352 {
 353         switch (open_flags) {
 354                 case FMODE_WRITE:
 355                         state->n_wronly++;
 356                         break;
 357                 case FMODE_READ:
 358                         state->n_rdonly++;
 359                         break;
 360                 case FMODE_READ|FMODE_WRITE:
 361                         state->n_rdwr++;
 362         }
 363         nfs4_state_set_mode_locked(state, state->state | open_flags);
 364 }
 365
 366 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 367 {
 368         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 369                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 370         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 371         switch (open_flags) {
 372                 case FMODE_READ:
 373                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 374                         break;
 375                 case FMODE_WRITE:
 376                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 377                         break;
 378                 case FMODE_READ|FMODE_WRITE:
 379                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 380         }
 381 }
 382
 383 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 384 {
 385         write_seqlock(&state->seqlock);
 386         nfs_set_open_stateid_locked(state, stateid, open_flags);
 387         write_sequnlock(&state->seqlock);
 388 }
 389
 390 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 391 {
 392         open_flags &= (FMODE_READ|FMODE_WRITE);
 393         /*
 394          * Protect the call to nfs4_state_set_mode_locked and
 395          * serialise the stateid update
 396          */
 397         write_seqlock(&state->seqlock);
 398         if (deleg_stateid != NULL) {
 399                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 400                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 401         }
 402         if (open_stateid != NULL)
 403                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 404         write_sequnlock(&state->seqlock);
 405         spin_lock(&state->owner->so_lock);
 406         update_open_stateflags(state, open_flags);
 407         spin_unlock(&state->owner->so_lock);
 408 }
 409
 410 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 411 {
 412         struct nfs_delegation *delegation;
 413
 414         rcu_read_lock();
 415         delegation = rcu_dereference(NFS_I(inode)->delegation);
 416         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 417                 rcu_read_unlock();
 418                 return;
 419         }
 420         rcu_read_unlock();
 421         nfs_inode_return_delegation(inode);
 422 }
 423
 424 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 425 {
 426         struct nfs4_state *state = opendata->state;
 427         struct nfs_inode *nfsi = NFS_I(state->inode);
 428         struct nfs_delegation *delegation;
 429         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 430         nfs4_stateid stateid;
 431         int ret = -EAGAIN;
 432
 433         rcu_read_lock();
 434         delegation = rcu_dereference(nfsi->delegation);
 435         for (;;) {
 436                 if (can_open_cached(state, open_mode)) {
 437                         spin_lock(&state->owner->so_lock);
 438                         if (can_open_cached(state, open_mode)) {
 439                                 update_open_stateflags(state, open_mode);
 440                                 spin_unlock(&state->owner->so_lock);
 441                                 rcu_read_unlock();
 442                                 goto out_return_state;
 443                         }
 444                         spin_unlock(&state->owner->so_lock);
 445                 }
 446                 if (delegation == NULL)
 447                         break;
 448                 if (!can_open_delegated(delegation, open_mode))
 449                         break;
 450                 /* Save the delegation */
 451                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 452                 rcu_read_unlock();
 453                 lock_kernel();
 454                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 455                 unlock_kernel();
 456                 if (ret != 0)
 457                         goto out;
 458                 ret = -EAGAIN;
 459                 rcu_read_lock();
 460                 delegation = rcu_dereference(nfsi->delegation);
 461                 /* If no delegation, try a cached open */
 462                 if (delegation == NULL)
 463                         continue;
 464                 /* Is the delegation still valid? */
 465                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 466                         continue;
 467                 rcu_read_unlock();
 468                 update_open_stateid(state, NULL, &stateid, open_mode);
 469                 goto out_return_state;
 470         }
 471         rcu_read_unlock();
 472 out:
 473         return ERR_PTR(ret);
 474 out_return_state:
 475         atomic_inc(&state->count);
 476         return state;
 477 }
 478
 479 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 480 {
 481         struct inode *inode;
 482         struct nfs4_state *state = NULL;
 483         struct nfs_delegation *delegation;
 484         nfs4_stateid *deleg_stateid = NULL;
 485         int ret;
 486
 487         if (!data->rpc_done) {
 488                 state = nfs4_try_open_cached(data);
 489                 goto out;
 490         }
 491
 492         ret = -EAGAIN;
 493         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 494                 goto err;
 495         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 496         ret = PTR_ERR(inode);
 497         if (IS_ERR(inode))
 498                 goto err;
 499         ret = -ENOMEM;
 500         state = nfs4_get_open_state(inode, data->owner);
 501         if (state == NULL)
 502                 goto err_put_inode;
 503         if (data->o_res.delegation_type != 0) {
 504                 int delegation_flags = 0;
 505
 506                 rcu_read_lock();
 507                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 508                 if (delegation)
 509                         delegation_flags = delegation->flags;
 510                 rcu_read_unlock();
 511                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 512                         nfs_inode_set_delegation(state->inode,
 513                                         data->owner->so_cred,
 514                                         &data->o_res);
 515                 else
 516                         nfs_inode_reclaim_delegation(state->inode,
 517                                         data->owner->so_cred,
 518                                         &data->o_res);
 519         }
 520         rcu_read_lock();
 521         delegation = rcu_dereference(NFS_I(inode)->delegation);
 522         if (delegation != NULL)
 523                 deleg_stateid = &delegation->stateid;
 524         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 525         rcu_read_unlock();
 526         iput(inode);
 527 out:
 528         return state;
 529 err_put_inode:
 530         iput(inode);
 531 err:
 532         return ERR_PTR(ret);
 533 }
 534
 535 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 536 {
 537         struct nfs_inode *nfsi = NFS_I(state->inode);
 538         struct nfs_open_context *ctx;
 539
 540         spin_lock(&state->inode->i_lock);
 541         list_for_each_entry(ctx, &nfsi->open_files, list) {
 542                 if (ctx->state != state)
 543                         continue;
 544                 get_nfs_open_context(ctx);
 545                 spin_unlock(&state->inode->i_lock);
 546                 return ctx;
 547         }
 548         spin_unlock(&state->inode->i_lock);
 549         return ERR_PTR(-ENOENT);
 550 }
 551
 552 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 553 {
 554         struct nfs4_opendata *opendata;
 555
 556         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 557         if (opendata == NULL)
 558                 return ERR_PTR(-ENOMEM);
 559         opendata->state = state;
 560         atomic_inc(&state->count);
 561         return opendata;
 562 }
 563
 564 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 565 {
 566         struct nfs4_state *newstate;
 567         int ret;
 568
 569         opendata->o_arg.open_flags = openflags;
 570         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 571         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 572         nfs4_init_opendata_res(opendata);
 573         ret = _nfs4_proc_open(opendata);
 574         if (ret != 0)
 575                 return ret;
 576         newstate = nfs4_opendata_to_nfs4_state(opendata);
 577         if (IS_ERR(newstate))
 578                 return PTR_ERR(newstate);
 579         nfs4_close_state(&opendata->path, newstate, openflags);
 580         *res = newstate;
 581         return 0;
 582 }
 583
 584 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 585 {
 586         struct nfs4_state *newstate;
 587         int ret;
 588
 589         /* memory barrier prior to reading state->n_* */
 590         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 591         smp_rmb();
 592         if (state->n_rdwr != 0) {
 593                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 594                 if (ret != 0)
 595                         return ret;
 596                 if (newstate != state)
 597                         return -ESTALE;
 598         }
 599         if (state->n_wronly != 0) {
 600                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 601                 if (ret != 0)
 602                         return ret;
 603                 if (newstate != state)
 604                         return -ESTALE;
 605         }
 606         if (state->n_rdonly != 0) {
 607                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 608                 if (ret != 0)
 609                         return ret;
 610                 if (newstate != state)
 611                         return -ESTALE;
 612         }
 613         /*
 614          * We may have performed cached opens for all three recoveries.
 615          * Check if we need to update the current stateid.
 616          */
 617         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 618             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 619                 write_seqlock(&state->seqlock);
 620                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 621                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 622                 write_sequnlock(&state->seqlock);
 623         }
 624         return 0;
 625 }
 626
 627 /*
 628  * OPEN_RECLAIM:
 629  *      reclaim state on the server after a reboot.
 630  */
 631 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 632 {
 633         struct nfs_delegation *delegation;
 634         struct nfs4_opendata *opendata;
 635         int delegation_type = 0;
 636         int status;
 637
 638         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 639         if (IS_ERR(opendata))
 640                 return PTR_ERR(opendata);
 641         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 642         opendata->o_arg.fh = NFS_FH(state->inode);
 643         rcu_read_lock();
 644         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 645         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 646                 delegation_type = delegation->type;
 647         rcu_read_unlock();
 648         opendata->o_arg.u.delegation_type = delegation_type;
 649         status = nfs4_open_recover(opendata, state);
 650         nfs4_opendata_put(opendata);
 651         return status;
 652 }
 653
 654 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 655 {
 656         struct nfs_server *server = NFS_SERVER(state->inode);
 657         struct nfs4_exception exception = { };
 658         int err;
 659         do {
 660                 err = _nfs4_do_open_reclaim(ctx, state);
 661                 if (err != -NFS4ERR_DELAY)
 662                         break;
 663                 nfs4_handle_exception(server, err, &exception);
 664         } while (exception.retry);
 665         return err;
 666 }
 667
 668 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 669 {
 670         struct nfs_open_context *ctx;
 671         int ret;
 672
 673         ctx = nfs4_state_find_open_context(state);
 674         if (IS_ERR(ctx))
 675                 return PTR_ERR(ctx);
 676         ret = nfs4_do_open_reclaim(ctx, state);
 677         put_nfs_open_context(ctx);
 678         return ret;
 679 }
 680
 681 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 682 {
 683         struct nfs4_opendata *opendata;
 684         int ret;
 685
 686         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 687         if (IS_ERR(opendata))
 688                 return PTR_ERR(opendata);
 689         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 690         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 691                         sizeof(opendata->o_arg.u.delegation.data));
 692         ret = nfs4_open_recover(opendata, state);
 693         nfs4_opendata_put(opendata);
 694         return ret;
 695 }
 696
 697 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 698 {
 699         struct nfs4_exception exception = { };
 700         struct nfs_server *server = NFS_SERVER(state->inode);
 701         int err;
 702         do {
 703                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 704                 switch (err) {
 705                         case 0:
 706                                 return err;
 707                         case -NFS4ERR_STALE_CLIENTID:
 708                         case -NFS4ERR_STALE_STATEID:
 709                         case -NFS4ERR_EXPIRED:
 710                                 /* Don't recall a delegation if it was lost */
 711                                 nfs4_schedule_state_recovery(server->nfs_client);
 712                                 return err;
 713                 }
 714                 err = nfs4_handle_exception(server, err, &exception);
 715         } while (exception.retry);
 716         return err;
 717 }
 718
 719 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 720 {
 721         struct nfs4_opendata *data = calldata;
 722
 723         data->rpc_status = task->tk_status;
 724         if (RPC_ASSASSINATED(task))
 725                 return;
 726         if (data->rpc_status == 0) {
 727                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 728                                 sizeof(data->o_res.stateid.data));
 729                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 730                 renew_lease(data->o_res.server, data->timestamp);
 731                 data->rpc_done = 1;
 732         }
 733         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 734 }
 735
 736 static void nfs4_open_confirm_release(void *calldata)
 737 {
 738         struct nfs4_opendata *data = calldata;
 739         struct nfs4_state *state = NULL;
 740
 741         /* If this request hasn't been cancelled, do nothing */
 742         if (data->cancelled == 0)
 743                 goto out_free;
 744         /* In case of error, no cleanup! */
 745         if (!data->rpc_done)
 746                 goto out_free;
 747         state = nfs4_opendata_to_nfs4_state(data);
 748         if (!IS_ERR(state))
 749                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 750 out_free:
 751         nfs4_opendata_put(data);
 752 }
 753
 754 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 755         .rpc_call_done = nfs4_open_confirm_done,
 756         .rpc_release = nfs4_open_confirm_release,
 757 };
 758
 759 /*
 760  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 761  */
 762 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 763 {
 764         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 765         struct rpc_task *task;
 766         struct  rpc_message msg = {
 767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 768                 .rpc_argp = &data->c_arg,
 769                 .rpc_resp = &data->c_res,
 770                 .rpc_cred = data->owner->so_cred,
 771         };
 772         struct rpc_task_setup task_setup_data = {
 773                 .rpc_client = server->client,
 774                 .rpc_message = &msg,
 775                 .callback_ops = &nfs4_open_confirm_ops,
 776                 .callback_data = data,
 777                 .workqueue = nfsiod_workqueue,
 778                 .flags = RPC_TASK_ASYNC,
 779         };
 780         int status;
 781
 782         kref_get(&data->kref);
 783         data->rpc_done = 0;
 784         data->rpc_status = 0;
 785         data->timestamp = jiffies;
 786         task = rpc_run_task(&task_setup_data);
 787         if (IS_ERR(task))
 788                 return PTR_ERR(task);
 789         status = nfs4_wait_for_completion_rpc_task(task);
 790         if (status != 0) {
 791                 data->cancelled = 1;
 792                 smp_wmb();
 793         } else
 794                 status = data->rpc_status;
 795         rpc_put_task(task);
 796         return status;
 797 }
 798
 799 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_opendata *data = calldata;
 802         struct nfs4_state_owner *sp = data->owner;
 803
 804         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 805                 return;
 806         /*
 807          * Check if we still need to send an OPEN call, or if we can use
 808          * a delegation instead.
 809          */
 810         if (data->state != NULL) {
 811                 struct nfs_delegation *delegation;
 812
 813                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 814                         goto out_no_action;
 815                 rcu_read_lock();
 816                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 817                 if (delegation != NULL &&
 818                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 819                         rcu_read_unlock();
 820                         goto out_no_action;
 821                 }
 822                 rcu_read_unlock();
 823         }
 824         /* Update sequence id. */
 825         data->o_arg.id = sp->so_owner_id.id;
 826         data->o_arg.clientid = sp->so_client->cl_clientid;
 827         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 828                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 829                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 830         }
 831         data->timestamp = jiffies;
 832         rpc_call_start(task);
 833         return;
 834 out_no_action:
 835         task->tk_action = NULL;
 836
 837 }
 838
 839 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_opendata *data = calldata;
 842
 843         data->rpc_status = task->tk_status;
 844         if (RPC_ASSASSINATED(task))
 845                 return;
 846         if (task->tk_status == 0) {
 847                 switch (data->o_res.f_attr->mode & S_IFMT) {
 848                         case S_IFREG:
 849                                 break;
 850                         case S_IFLNK:
 851                                 data->rpc_status = -ELOOP;
 852                                 break;
 853                         case S_IFDIR:
 854                                 data->rpc_status = -EISDIR;
 855                                 break;
 856                         default:
 857                                 data->rpc_status = -ENOTDIR;
 858                 }
 859                 renew_lease(data->o_res.server, data->timestamp);
 860                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 861                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 862         }
 863         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 864         data->rpc_done = 1;
 865 }
 866
 867 static void nfs4_open_release(void *calldata)
 868 {
 869         struct nfs4_opendata *data = calldata;
 870         struct nfs4_state *state = NULL;
 871
 872         /* If this request hasn't been cancelled, do nothing */
 873         if (data->cancelled == 0)
 874                 goto out_free;
 875         /* In case of error, no cleanup! */
 876         if (data->rpc_status != 0 || !data->rpc_done)
 877                 goto out_free;
 878         /* In case we need an open_confirm, no cleanup! */
 879         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 880                 goto out_free;
 881         state = nfs4_opendata_to_nfs4_state(data);
 882         if (!IS_ERR(state))
 883                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 884 out_free:
 885         nfs4_opendata_put(data);
 886 }
 887
 888 static const struct rpc_call_ops nfs4_open_ops = {
 889         .rpc_call_prepare = nfs4_open_prepare,
 890         .rpc_call_done = nfs4_open_done,
 891         .rpc_release = nfs4_open_release,
 892 };
 893
 894 /*
 895  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 896  */
 897 static int _nfs4_proc_open(struct nfs4_opendata *data)
 898 {
 899         struct inode *dir = data->dir->d_inode;
 900         struct nfs_server *server = NFS_SERVER(dir);
 901         struct nfs_openargs *o_arg = &data->o_arg;
 902         struct nfs_openres *o_res = &data->o_res;
 903         struct rpc_task *task;
 904         struct rpc_message msg = {
 905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 906                 .rpc_argp = o_arg,
 907                 .rpc_resp = o_res,
 908                 .rpc_cred = data->owner->so_cred,
 909         };
 910         struct rpc_task_setup task_setup_data = {
 911                 .rpc_client = server->client,
 912                 .rpc_message = &msg,
 913                 .callback_ops = &nfs4_open_ops,
 914                 .callback_data = data,
 915                 .workqueue = nfsiod_workqueue,
 916                 .flags = RPC_TASK_ASYNC,
 917         };
 918         int status;
 919
 920         kref_get(&data->kref);
 921         data->rpc_done = 0;
 922         data->rpc_status = 0;
 923         data->cancelled = 0;
 924         task = rpc_run_task(&task_setup_data);
 925         if (IS_ERR(task))
 926                 return PTR_ERR(task);
 927         status = nfs4_wait_for_completion_rpc_task(task);
 928         if (status != 0) {
 929                 data->cancelled = 1;
 930                 smp_wmb();
 931         } else
 932                 status = data->rpc_status;
 933         rpc_put_task(task);
 934         if (status != 0 || !data->rpc_done)
 935                 return status;
 936
 937         if (o_res->fh.size == 0)
 938                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 939
 940         if (o_arg->open_flags & O_CREAT) {
 941                 update_changeattr(dir, &o_res->cinfo);
 942                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 943         } else
 944                 nfs_refresh_inode(dir, o_res->dir_attr);
 945         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 946                 status = _nfs4_proc_open_confirm(data);
 947                 if (status != 0)
 948                         return status;
 949         }
 950         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 951                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 952         return 0;
 953 }
 954
 955 static int nfs4_recover_expired_lease(struct nfs_server *server)
 956 {
 957         struct nfs_client *clp = server->nfs_client;
 958         int ret;
 959
 960         for (;;) {
 961                 ret = nfs4_wait_clnt_recover(server->client, clp);
 962                 if (ret != 0)
 963                         return ret;
 964                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 965                         break;
 966                 nfs4_schedule_state_recovery(clp);
 967         }
 968         return 0;
 969 }
 970
 971 /*
 972  * OPEN_EXPIRED:
 973  *      reclaim state on the server after a network partition.
 974  *      Assumes caller holds the appropriate lock
 975  */
 976 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 977 {
 978         struct nfs4_opendata *opendata;
 979         int ret;
 980
 981         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 982         if (IS_ERR(opendata))
 983                 return PTR_ERR(opendata);
 984         ret = nfs4_open_recover(opendata, state);
 985         if (ret == -ESTALE) {
 986                 /* Invalidate the state owner so we don't ever use it again */
 987                 nfs4_drop_state_owner(state->owner);
 988                 d_drop(ctx->path.dentry);
 989         }
 990         nfs4_opendata_put(opendata);
 991         return ret;
 992 }
 993
 994 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 995 {
 996         struct nfs_server *server = NFS_SERVER(state->inode);
 997         struct nfs4_exception exception = { };
 998         int err;
 999
1000         do {
1001                 err = _nfs4_open_expired(ctx, state);
1002                 if (err == -NFS4ERR_DELAY)
1003                         nfs4_handle_exception(server, err, &exception);
1004         } while (exception.retry);
1005         return err;
1006 }
1007
1008 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1009 {
1010         struct nfs_open_context *ctx;
1011         int ret;
1012
1013         ctx = nfs4_state_find_open_context(state);
1014         if (IS_ERR(ctx))
1015                 return PTR_ERR(ctx);
1016         ret = nfs4_do_open_expired(ctx, state);
1017         put_nfs_open_context(ctx);
1018         return ret;
1019 }
1020
1021 /*
1022  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1023  * fields corresponding to attributes that were used to store the verifier.
1024  * Make sure we clobber those fields in the later setattr call
1025  */
1026 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1027 {
1028         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1029             !(sattr->ia_valid & ATTR_ATIME_SET))
1030                 sattr->ia_valid |= ATTR_ATIME;
1031
1032         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1033             !(sattr->ia_valid & ATTR_MTIME_SET))
1034                 sattr->ia_valid |= ATTR_MTIME;
1035 }
1036
1037 /*
1038  * Returns a referenced nfs4_state
1039  */
1040 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1041 {
1042         struct nfs4_state_owner  *sp;
1043         struct nfs4_state     *state = NULL;
1044         struct nfs_server       *server = NFS_SERVER(dir);
1045         struct nfs_client *clp = server->nfs_client;
1046         struct nfs4_opendata *opendata;
1047         int status;
1048
1049         /* Protect against reboot recovery conflicts */
1050         status = -ENOMEM;
1051         if (!(sp = nfs4_get_state_owner(server, cred))) {
1052                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1053                 goto out_err;
1054         }
1055         status = nfs4_recover_expired_lease(server);
1056         if (status != 0)
1057                 goto err_put_state_owner;
1058         if (path->dentry->d_inode != NULL)
1059                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1060         down_read(&clp->cl_sem);
1061         status = -ENOMEM;
1062         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1063         if (opendata == NULL)
1064                 goto err_release_rwsem;
1065
1066         if (path->dentry->d_inode != NULL)
1067                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1068
1069         status = _nfs4_proc_open(opendata);
1070         if (status != 0)
1071                 goto err_opendata_put;
1072
1073         if (opendata->o_arg.open_flags & O_EXCL)
1074                 nfs4_exclusive_attrset(opendata, sattr);
1075
1076         state = nfs4_opendata_to_nfs4_state(opendata);
1077         status = PTR_ERR(state);
1078         if (IS_ERR(state))
1079                 goto err_opendata_put;
1080         nfs4_opendata_put(opendata);
1081         nfs4_put_state_owner(sp);
1082         up_read(&clp->cl_sem);
1083         *res = state;
1084         return 0;
1085 err_opendata_put:
1086         nfs4_opendata_put(opendata);
1087 err_release_rwsem:
1088         up_read(&clp->cl_sem);
1089 err_put_state_owner:
1090         nfs4_put_state_owner(sp);
1091 out_err:
1092         *res = NULL;
1093         return status;
1094 }
1095
1096
1097 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1098 {
1099         struct nfs4_exception exception = { };
1100         struct nfs4_state *res;
1101         int status;
1102
1103         do {
1104                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1105                 if (status == 0)
1106                         break;
1107                 /* NOTE: BAD_SEQID means the server and client disagree about the
1108                  * book-keeping w.r.t. state-changing operations
1109                  * (OPEN/CLOSE/LOCK/LOCKU...)
1110                  * It is actually a sign of a bug on the client or on the server.
1111                  *
1112                  * If we receive a BAD_SEQID error in the particular case of
1113                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1114                  * have unhashed the old state_owner for us, and that we can
1115                  * therefore safely retry using a new one. We should still warn
1116                  * the user though...
1117                  */
1118                 if (status == -NFS4ERR_BAD_SEQID) {
1119                         printk(KERN_WARNING "NFS: v4 server %s "
1120                                         " returned a bad sequence-id error!\n",
1121                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1122                         exception.retry = 1;
1123                         continue;
1124                 }
1125                 /*
1126                  * BAD_STATEID on OPEN means that the server cancelled our
1127                  * state before it received the OPEN_CONFIRM.
1128                  * Recover by retrying the request as per the discussion
1129                  * on Page 181 of RFC3530.
1130                  */
1131                 if (status == -NFS4ERR_BAD_STATEID) {
1132                         exception.retry = 1;
1133                         continue;
1134                 }
1135                 if (status == -EAGAIN) {
1136                         /* We must have found a delegation */
1137                         exception.retry = 1;
1138                         continue;
1139                 }
1140                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1141                                         status, &exception));
1142         } while (exception.retry);
1143         return res;
1144 }
1145
1146 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1147                 struct iattr *sattr, struct nfs4_state *state)
1148 {
1149         struct nfs_server *server = NFS_SERVER(inode);
1150         struct nfs_setattrargs  arg = {
1151                 .fh             = NFS_FH(inode),
1152                 .iap            = sattr,
1153                 .server         = server,
1154                 .bitmask = server->attr_bitmask,
1155         };
1156         struct nfs_setattrres  res = {
1157                 .fattr          = fattr,
1158                 .server         = server,
1159         };
1160         struct rpc_message msg = {
1161                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1162                 .rpc_argp       = &arg,
1163                 .rpc_resp       = &res,
1164         };
1165         unsigned long timestamp = jiffies;
1166         int status;
1167
1168         nfs_fattr_init(fattr);
1169
1170         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1171                 /* Use that stateid */
1172         } else if (state != NULL) {
1173                 msg.rpc_cred = state->owner->so_cred;
1174                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1175         } else
1176                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1177
1178         status = rpc_call_sync(server->client, &msg, 0);
1179         if (status == 0 && state != NULL)
1180                 renew_lease(server, timestamp);
1181         return status;
1182 }
1183
1184 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1185                 struct iattr *sattr, struct nfs4_state *state)
1186 {
1187         struct nfs_server *server = NFS_SERVER(inode);
1188         struct nfs4_exception exception = { };
1189         int err;
1190         do {
1191                 err = nfs4_handle_exception(server,
1192                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1193                                 &exception);
1194         } while (exception.retry);
1195         return err;
1196 }
1197
1198 struct nfs4_closedata {
1199         struct path path;
1200         struct inode *inode;
1201         struct nfs4_state *state;
1202         struct nfs_closeargs arg;
1203         struct nfs_closeres res;
1204         struct nfs_fattr fattr;
1205         unsigned long timestamp;
1206 };
1207
1208 static void nfs4_free_closedata(void *data)
1209 {
1210         struct nfs4_closedata *calldata = data;
1211         struct nfs4_state_owner *sp = calldata->state->owner;
1212
1213         nfs4_put_open_state(calldata->state);
1214         nfs_free_seqid(calldata->arg.seqid);
1215         nfs4_put_state_owner(sp);
1216         dput(calldata->path.dentry);
1217         mntput(calldata->path.mnt);
1218         kfree(calldata);
1219 }
1220
1221 static void nfs4_close_done(struct rpc_task *task, void *data)
1222 {
1223         struct nfs4_closedata *calldata = data;
1224         struct nfs4_state *state = calldata->state;
1225         struct nfs_server *server = NFS_SERVER(calldata->inode);
1226
1227         if (RPC_ASSASSINATED(task))
1228                 return;
1229         /* hmm. we are done with the inode, and in the process of freeing
1230          * the state_owner. we keep this around to process errors
1231          */
1232         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1233         switch (task->tk_status) {
1234                 case 0:
1235                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1236                         renew_lease(server, calldata->timestamp);
1237                         break;
1238                 case -NFS4ERR_STALE_STATEID:
1239                 case -NFS4ERR_EXPIRED:
1240                         break;
1241                 default:
1242                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1243                                 rpc_restart_call(task);
1244                                 return;
1245                         }
1246         }
1247         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1248 }
1249
1250 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1251 {
1252         struct nfs4_closedata *calldata = data;
1253         struct nfs4_state *state = calldata->state;
1254         int clear_rd, clear_wr, clear_rdwr;
1255
1256         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1257                 return;
1258
1259         clear_rd = clear_wr = clear_rdwr = 0;
1260         spin_lock(&state->owner->so_lock);
1261         /* Calculate the change in open mode */
1262         if (state->n_rdwr == 0) {
1263                 if (state->n_rdonly == 0) {
1264                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1265                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1266                 }
1267                 if (state->n_wronly == 0) {
1268                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1269                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1270                 }
1271         }
1272         spin_unlock(&state->owner->so_lock);
1273         if (!clear_rd && !clear_wr && !clear_rdwr) {
1274                 /* Note: exit _without_ calling nfs4_close_done */
1275                 task->tk_action = NULL;
1276                 return;
1277         }
1278         nfs_fattr_init(calldata->res.fattr);
1279         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1280                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1281                 calldata->arg.open_flags = FMODE_READ;
1282         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1283                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1284                 calldata->arg.open_flags = FMODE_WRITE;
1285         }
1286         calldata->timestamp = jiffies;
1287         rpc_call_start(task);
1288 }
1289
1290 static const struct rpc_call_ops nfs4_close_ops = {
1291         .rpc_call_prepare = nfs4_close_prepare,
1292         .rpc_call_done = nfs4_close_done,
1293         .rpc_release = nfs4_free_closedata,
1294 };
1295
1296 /*
1297  * It is possible for data to be read/written from a mem-mapped file
1298  * after the sys_close call (which hits the vfs layer as a flush).
1299  * This means that we can't safely call nfsv4 close on a file until
1300  * the inode is cleared. This in turn means that we are not good
1301  * NFSv4 citizens - we do not indicate to the server to update the file's
1302  * share state even when we are done with one of the three share
1303  * stateid's in the inode.
1304  *
1305  * NOTE: Caller must be holding the sp->so_owner semaphore!
1306  */
1307 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1308 {
1309         struct nfs_server *server = NFS_SERVER(state->inode);
1310         struct nfs4_closedata *calldata;
1311         struct nfs4_state_owner *sp = state->owner;
1312         struct rpc_task *task;
1313         struct rpc_message msg = {
1314                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1315                 .rpc_cred = state->owner->so_cred,
1316         };
1317         struct rpc_task_setup task_setup_data = {
1318                 .rpc_client = server->client,
1319                 .rpc_message = &msg,
1320                 .callback_ops = &nfs4_close_ops,
1321                 .workqueue = nfsiod_workqueue,
1322                 .flags = RPC_TASK_ASYNC,
1323         };
1324         int status = -ENOMEM;
1325
1326         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1327         if (calldata == NULL)
1328                 goto out;
1329         calldata->inode = state->inode;
1330         calldata->state = state;
1331         calldata->arg.fh = NFS_FH(state->inode);
1332         calldata->arg.stateid = &state->open_stateid;
1333         /* Serialization for the sequence id */
1334         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1335         if (calldata->arg.seqid == NULL)
1336                 goto out_free_calldata;
1337         calldata->arg.bitmask = server->attr_bitmask;
1338         calldata->res.fattr = &calldata->fattr;
1339         calldata->res.server = server;
1340         calldata->path.mnt = mntget(path->mnt);
1341         calldata->path.dentry = dget(path->dentry);
1342
1343         msg.rpc_argp = &calldata->arg,
1344         msg.rpc_resp = &calldata->res,
1345         task_setup_data.callback_data = calldata;
1346         task = rpc_run_task(&task_setup_data);
1347         if (IS_ERR(task))
1348                 return PTR_ERR(task);
1349         status = 0;
1350         if (wait)
1351                 status = rpc_wait_for_completion_task(task);
1352         rpc_put_task(task);
1353         return status;
1354 out_free_calldata:
1355         kfree(calldata);
1356 out:
1357         nfs4_put_open_state(state);
1358         nfs4_put_state_owner(sp);
1359         return status;
1360 }
1361
1362 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1363 {
1364         struct file *filp;
1365         int ret;
1366
1367         /* If the open_intent is for execute, we have an extra check to make */
1368         if (nd->intent.open.flags & FMODE_EXEC) {
1369                 ret = nfs_may_open(state->inode,
1370                                 state->owner->so_cred,
1371                                 nd->intent.open.flags);
1372                 if (ret < 0)
1373                         goto out_close;
1374         }
1375         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1376         if (!IS_ERR(filp)) {
1377                 struct nfs_open_context *ctx;
1378                 ctx = nfs_file_open_context(filp);
1379                 ctx->state = state;
1380                 return 0;
1381         }
1382         ret = PTR_ERR(filp);
1383 out_close:
1384         nfs4_close_sync(path, state, nd->intent.open.flags);
1385         return ret;
1386 }
1387
1388 struct dentry *
1389 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1390 {
1391         struct path path = {
1392                 .mnt = nd->path.mnt,
1393                 .dentry = dentry,
1394         };
1395         struct dentry *parent;
1396         struct iattr attr;
1397         struct rpc_cred *cred;
1398         struct nfs4_state *state;
1399         struct dentry *res;
1400
1401         if (nd->flags & LOOKUP_CREATE) {
1402                 attr.ia_mode = nd->intent.open.create_mode;
1403                 attr.ia_valid = ATTR_MODE;
1404                 if (!IS_POSIXACL(dir))
1405                         attr.ia_mode &= ~current->fs->umask;
1406         } else {
1407                 attr.ia_valid = 0;
1408                 BUG_ON(nd->intent.open.flags & O_CREAT);
1409         }
1410
1411         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1412         if (IS_ERR(cred))
1413                 return (struct dentry *)cred;
1414         parent = dentry->d_parent;
1415         /* Protect against concurrent sillydeletes */
1416         nfs_block_sillyrename(parent);
1417         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1418         put_rpccred(cred);
1419         if (IS_ERR(state)) {
1420                 if (PTR_ERR(state) == -ENOENT) {
1421                         d_add(dentry, NULL);
1422                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1423                 }
1424                 nfs_unblock_sillyrename(parent);
1425                 return (struct dentry *)state;
1426         }
1427         res = d_add_unique(dentry, igrab(state->inode));
1428         if (res != NULL)
1429                 path.dentry = res;
1430         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1431         nfs_unblock_sillyrename(parent);
1432         nfs4_intent_set_file(nd, &path, state);
1433         return res;
1434 }
1435
1436 int
1437 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1438 {
1439         struct path path = {
1440                 .mnt = nd->path.mnt,
1441                 .dentry = dentry,
1442         };
1443         struct rpc_cred *cred;
1444         struct nfs4_state *state;
1445
1446         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1447         if (IS_ERR(cred))
1448                 return PTR_ERR(cred);
1449         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1450         put_rpccred(cred);
1451         if (IS_ERR(state)) {
1452                 switch (PTR_ERR(state)) {
1453                         case -EPERM:
1454                         case -EACCES:
1455                         case -EDQUOT:
1456                         case -ENOSPC:
1457                         case -EROFS:
1458                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1459                                 return 1;
1460                         default:
1461                                 goto out_drop;
1462                 }
1463         }
1464         if (state->inode == dentry->d_inode) {
1465                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1466                 nfs4_intent_set_file(nd, &path, state);
1467                 return 1;
1468         }
1469         nfs4_close_sync(&path, state, openflags);
1470 out_drop:
1471         d_drop(dentry);
1472         return 0;
1473 }
1474
1475
1476 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1477 {
1478         struct nfs4_server_caps_res res = {};
1479         struct rpc_message msg = {
1480                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1481                 .rpc_argp = fhandle,
1482                 .rpc_resp = &res,
1483         };
1484         int status;
1485
1486         status = rpc_call_sync(server->client, &msg, 0);
1487         if (status == 0) {
1488                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1489                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1490                         server->caps |= NFS_CAP_ACLS;
1491                 if (res.has_links != 0)
1492                         server->caps |= NFS_CAP_HARDLINKS;
1493                 if (res.has_symlinks != 0)
1494                         server->caps |= NFS_CAP_SYMLINKS;
1495                 server->acl_bitmask = res.acl_bitmask;
1496         }
1497         return status;
1498 }
1499
1500 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1501 {
1502         struct nfs4_exception exception = { };
1503         int err;
1504         do {
1505                 err = nfs4_handle_exception(server,
1506                                 _nfs4_server_capabilities(server, fhandle),
1507                                 &exception);
1508         } while (exception.retry);
1509         return err;
1510 }
1511
1512 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1513                 struct nfs_fsinfo *info)
1514 {
1515         struct nfs4_lookup_root_arg args = {
1516                 .bitmask = nfs4_fattr_bitmap,
1517         };
1518         struct nfs4_lookup_res res = {
1519                 .server = server,
1520                 .fattr = info->fattr,
1521                 .fh = fhandle,
1522         };
1523         struct rpc_message msg = {
1524                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1525                 .rpc_argp = &args,
1526                 .rpc_resp = &res,
1527         };
1528         nfs_fattr_init(info->fattr);
1529         return rpc_call_sync(server->client, &msg, 0);
1530 }
1531
1532 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1533                 struct nfs_fsinfo *info)
1534 {
1535         struct nfs4_exception exception = { };
1536         int err;
1537         do {
1538                 err = nfs4_handle_exception(server,
1539                                 _nfs4_lookup_root(server, fhandle, info),
1540                                 &exception);
1541         } while (exception.retry);
1542         return err;
1543 }
1544
1545 /*
1546  * get the file handle for the "/" directory on the server
1547  */
1548 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1549                               struct nfs_fsinfo *info)
1550 {
1551         int status;
1552
1553         status = nfs4_lookup_root(server, fhandle, info);
1554         if (status == 0)
1555                 status = nfs4_server_capabilities(server, fhandle);
1556         if (status == 0)
1557                 status = nfs4_do_fsinfo(server, fhandle, info);
1558         return nfs4_map_errors(status);
1559 }
1560
1561 /*
1562  * Get locations and (maybe) other attributes of a referral.
1563  * Note that we'll actually follow the referral later when
1564  * we detect fsid mismatch in inode revalidation
1565  */
1566 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1567 {
1568         int status = -ENOMEM;
1569         struct page *page = NULL;
1570         struct nfs4_fs_locations *locations = NULL;
1571
1572         page = alloc_page(GFP_KERNEL);
1573         if (page == NULL)
1574                 goto out;
1575         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1576         if (locations == NULL)
1577                 goto out;
1578
1579         status = nfs4_proc_fs_locations(dir, name, locations, page);
1580         if (status != 0)
1581                 goto out;
1582         /* Make sure server returned a different fsid for the referral */
1583         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1584                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1585                 status = -EIO;
1586                 goto out;
1587         }
1588
1589         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1590         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1591         if (!fattr->mode)
1592                 fattr->mode = S_IFDIR;
1593         memset(fhandle, 0, sizeof(struct nfs_fh));
1594 out:
1595         if (page)
1596                 __free_page(page);
1597         if (locations)
1598                 kfree(locations);
1599         return status;
1600 }
1601
1602 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1603 {
1604         struct nfs4_getattr_arg args = {
1605                 .fh = fhandle,
1606                 .bitmask = server->attr_bitmask,
1607         };
1608         struct nfs4_getattr_res res = {
1609                 .fattr = fattr,
1610                 .server = server,
1611         };
1612         struct rpc_message msg = {
1613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1614                 .rpc_argp = &args,
1615                 .rpc_resp = &res,
1616         };
1617
1618         nfs_fattr_init(fattr);
1619         return rpc_call_sync(server->client, &msg, 0);
1620 }
1621
1622 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1623 {
1624         struct nfs4_exception exception = { };
1625         int err;
1626         do {
1627                 err = nfs4_handle_exception(server,
1628                                 _nfs4_proc_getattr(server, fhandle, fattr),
1629                                 &exception);
1630         } while (exception.retry);
1631         return err;
1632 }
1633
1634 /*
1635  * The file is not closed if it is opened due to the a request to change
1636  * the size of the file. The open call will not be needed once the
1637  * VFS layer lookup-intents are implemented.
1638  *
1639  * Close is called when the inode is destroyed.
1640  * If we haven't opened the file for O_WRONLY, we
1641  * need to in the size_change case to obtain a stateid.
1642  *
1643  * Got race?
1644  * Because OPEN is always done by name in nfsv4, it is
1645  * possible that we opened a different file by the same
1646  * name.  We can recognize this race condition, but we
1647  * can't do anything about it besides returning an error.
1648  *
1649  * This will be fixed with VFS changes (lookup-intent).
1650  */
1651 static int
1652 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1653                   struct iattr *sattr)
1654 {
1655         struct rpc_cred *cred;
1656         struct inode *inode = dentry->d_inode;
1657         struct nfs_open_context *ctx;
1658         struct nfs4_state *state = NULL;
1659         int status;
1660
1661         nfs_fattr_init(fattr);
1662
1663         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1664         if (IS_ERR(cred))
1665                 return PTR_ERR(cred);
1666
1667         /* Search for an existing open(O_WRITE) file */
1668         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1669         if (ctx != NULL)
1670                 state = ctx->state;
1671
1672         status = nfs4_do_setattr(inode, fattr, sattr, state);
1673         if (status == 0)
1674                 nfs_setattr_update_inode(inode, sattr);
1675         if (ctx != NULL)
1676                 put_nfs_open_context(ctx);
1677         put_rpccred(cred);
1678         return status;
1679 }
1680
1681 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1682                 const struct qstr *name, struct nfs_fh *fhandle,
1683                 struct nfs_fattr *fattr)
1684 {
1685         int                    status;
1686         struct nfs4_lookup_arg args = {
1687                 .bitmask = server->attr_bitmask,
1688                 .dir_fh = dirfh,
1689                 .name = name,
1690         };
1691         struct nfs4_lookup_res res = {
1692                 .server = server,
1693                 .fattr = fattr,
1694                 .fh = fhandle,
1695         };
1696         struct rpc_message msg = {
1697                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1698                 .rpc_argp = &args,
1699                 .rpc_resp = &res,
1700         };
1701
1702         nfs_fattr_init(fattr);
1703
1704         dprintk("NFS call  lookupfh %s\n", name->name);
1705         status = rpc_call_sync(server->client, &msg, 0);
1706         dprintk("NFS reply lookupfh: %d\n", status);
1707         return status;
1708 }
1709
1710 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1711                               struct qstr *name, struct nfs_fh *fhandle,
1712                               struct nfs_fattr *fattr)
1713 {
1714         struct nfs4_exception exception = { };
1715         int err;
1716         do {
1717                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1718                 /* FIXME: !!!! */
1719                 if (err == -NFS4ERR_MOVED) {
1720                         err = -EREMOTE;
1721                         break;
1722                 }
1723                 err = nfs4_handle_exception(server, err, &exception);
1724         } while (exception.retry);
1725         return err;
1726 }
1727
1728 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1729                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1730 {
1731         int status;
1732
1733         dprintk("NFS call  lookup %s\n", name->name);
1734         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1735         if (status == -NFS4ERR_MOVED)
1736                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1737         dprintk("NFS reply lookup: %d\n", status);
1738         return status;
1739 }
1740
1741 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1742 {
1743         struct nfs4_exception exception = { };
1744         int err;
1745         do {
1746                 err = nfs4_handle_exception(NFS_SERVER(dir),
1747                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1748                                 &exception);
1749         } while (exception.retry);
1750         return err;
1751 }
1752
1753 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1754 {
1755         struct nfs_server *server = NFS_SERVER(inode);
1756         struct nfs_fattr fattr;
1757         struct nfs4_accessargs args = {
1758                 .fh = NFS_FH(inode),
1759                 .bitmask = server->attr_bitmask,
1760         };
1761         struct nfs4_accessres res = {
1762                 .server = server,
1763                 .fattr = &fattr,
1764         };
1765         struct rpc_message msg = {
1766                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1767                 .rpc_argp = &args,
1768                 .rpc_resp = &res,
1769                 .rpc_cred = entry->cred,
1770         };
1771         int mode = entry->mask;
1772         int status;
1773
1774         /*
1775          * Determine which access bits we want to ask for...
1776          */
1777         if (mode & MAY_READ)
1778                 args.access |= NFS4_ACCESS_READ;
1779         if (S_ISDIR(inode->i_mode)) {
1780                 if (mode & MAY_WRITE)
1781                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1782                 if (mode & MAY_EXEC)
1783                         args.access |= NFS4_ACCESS_LOOKUP;
1784         } else {
1785                 if (mode & MAY_WRITE)
1786                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1787                 if (mode & MAY_EXEC)
1788                         args.access |= NFS4_ACCESS_EXECUTE;
1789         }
1790         nfs_fattr_init(&fattr);
1791         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1792         if (!status) {
1793                 entry->mask = 0;
1794                 if (res.access & NFS4_ACCESS_READ)
1795                         entry->mask |= MAY_READ;
1796                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1797                         entry->mask |= MAY_WRITE;
1798                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1799                         entry->mask |= MAY_EXEC;
1800                 nfs_refresh_inode(inode, &fattr);
1801         }
1802         return status;
1803 }
1804
1805 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1806 {
1807         struct nfs4_exception exception = { };
1808         int err;
1809         do {
1810                 err = nfs4_handle_exception(NFS_SERVER(inode),
1811                                 _nfs4_proc_access(inode, entry),
1812                                 &exception);
1813         } while (exception.retry);
1814         return err;
1815 }
1816
1817 /*
1818  * TODO: For the time being, we don't try to get any attributes
1819  * along with any of the zero-copy operations READ, READDIR,
1820  * READLINK, WRITE.
1821  *
1822  * In the case of the first three, we want to put the GETATTR
1823  * after the read-type operation -- this is because it is hard
1824  * to predict the length of a GETATTR response in v4, and thus
1825  * align the READ data correctly.  This means that the GETATTR
1826  * may end up partially falling into the page cache, and we should
1827  * shift it into the 'tail' of the xdr_buf before processing.
1828  * To do this efficiently, we need to know the total length
1829  * of data received, which doesn't seem to be available outside
1830  * of the RPC layer.
1831  *
1832  * In the case of WRITE, we also want to put the GETATTR after
1833  * the operation -- in this case because we want to make sure
1834  * we get the post-operation mtime and size.  This means that
1835  * we can't use xdr_encode_pages() as written: we need a variant
1836  * of it which would leave room in the 'tail' iovec.
1837  *
1838  * Both of these changes to the XDR layer would in fact be quite
1839  * minor, but I decided to leave them for a subsequent patch.
1840  */
1841 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1842                 unsigned int pgbase, unsigned int pglen)
1843 {
1844         struct nfs4_readlink args = {
1845                 .fh       = NFS_FH(inode),
1846                 .pgbase   = pgbase,
1847                 .pglen    = pglen,
1848                 .pages    = &page,
1849         };
1850         struct rpc_message msg = {
1851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1852                 .rpc_argp = &args,
1853                 .rpc_resp = NULL,
1854         };
1855
1856         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1857 }
1858
1859 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1860                 unsigned int pgbase, unsigned int pglen)
1861 {
1862         struct nfs4_exception exception = { };
1863         int err;
1864         do {
1865                 err = nfs4_handle_exception(NFS_SERVER(inode),
1866                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1867                                 &exception);
1868         } while (exception.retry);
1869         return err;
1870 }
1871
1872 /*
1873  * Got race?
1874  * We will need to arrange for the VFS layer to provide an atomic open.
1875  * Until then, this create/open method is prone to inefficiency and race
1876  * conditions due to the lookup, create, and open VFS calls from sys_open()
1877  * placed on the wire.
1878  *
1879  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1880  * The file will be opened again in the subsequent VFS open call
1881  * (nfs4_proc_file_open).
1882  *
1883  * The open for read will just hang around to be used by any process that
1884  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1885  */
1886
1887 static int
1888 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1889                  int flags, struct nameidata *nd)
1890 {
1891         struct path path = {
1892                 .mnt = nd->path.mnt,
1893                 .dentry = dentry,
1894         };
1895         struct nfs4_state *state;
1896         struct rpc_cred *cred;
1897         int status = 0;
1898
1899         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1900         if (IS_ERR(cred)) {
1901                 status = PTR_ERR(cred);
1902                 goto out;
1903         }
1904         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1905         put_rpccred(cred);
1906         d_drop(dentry);
1907         if (IS_ERR(state)) {
1908                 status = PTR_ERR(state);
1909                 goto out;
1910         }
1911         d_add(dentry, igrab(state->inode));
1912         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1913         if (flags & O_EXCL) {
1914                 struct nfs_fattr fattr;
1915                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1916                 if (status == 0)
1917                         nfs_setattr_update_inode(state->inode, sattr);
1918                 nfs_post_op_update_inode(state->inode, &fattr);
1919         }
1920         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1921                 status = nfs4_intent_set_file(nd, &path, state);
1922         else
1923                 nfs4_close_sync(&path, state, flags);
1924 out:
1925         return status;
1926 }
1927
1928 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1929 {
1930         struct nfs_server *server = NFS_SERVER(dir);
1931         struct nfs_removeargs args = {
1932                 .fh = NFS_FH(dir),
1933                 .name.len = name->len,
1934                 .name.name = name->name,
1935                 .bitmask = server->attr_bitmask,
1936         };
1937         struct nfs_removeres res = {
1938                 .server = server,
1939         };
1940         struct rpc_message msg = {
1941                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1942                 .rpc_argp = &args,
1943                 .rpc_resp = &res,
1944         };
1945         int                     status;
1946
1947         nfs_fattr_init(&res.dir_attr);
1948         status = rpc_call_sync(server->client, &msg, 0);
1949         if (status == 0) {
1950                 update_changeattr(dir, &res.cinfo);
1951                 nfs_post_op_update_inode(dir, &res.dir_attr);
1952         }
1953         return status;
1954 }
1955
1956 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1957 {
1958         struct nfs4_exception exception = { };
1959         int err;
1960         do {
1961                 err = nfs4_handle_exception(NFS_SERVER(dir),
1962                                 _nfs4_proc_remove(dir, name),
1963                                 &exception);
1964         } while (exception.retry);
1965         return err;
1966 }
1967
1968 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1969 {
1970         struct nfs_server *server = NFS_SERVER(dir);
1971         struct nfs_removeargs *args = msg->rpc_argp;
1972         struct nfs_removeres *res = msg->rpc_resp;
1973
1974         args->bitmask = server->attr_bitmask;
1975         res->server = server;
1976         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1977 }
1978
1979 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1980 {
1981         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1982
1983         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1984                 return 0;
1985         update_changeattr(dir, &res->cinfo);
1986         nfs_post_op_update_inode(dir, &res->dir_attr);
1987         return 1;
1988 }
1989
1990 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1991                 struct inode *new_dir, struct qstr *new_name)
1992 {
1993         struct nfs_server *server = NFS_SERVER(old_dir);
1994         struct nfs4_rename_arg arg = {
1995                 .old_dir = NFS_FH(old_dir),
1996                 .new_dir = NFS_FH(new_dir),
1997                 .old_name = old_name,
1998                 .new_name = new_name,
1999                 .bitmask = server->attr_bitmask,
2000         };
2001         struct nfs_fattr old_fattr, new_fattr;
2002         struct nfs4_rename_res res = {
2003                 .server = server,
2004                 .old_fattr = &old_fattr,
2005                 .new_fattr = &new_fattr,
2006         };
2007         struct rpc_message msg = {
2008                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2009                 .rpc_argp = &arg,
2010                 .rpc_resp = &res,
2011         };
2012         int                     status;
2013
2014         nfs_fattr_init(res.old_fattr);
2015         nfs_fattr_init(res.new_fattr);
2016         status = rpc_call_sync(server->client, &msg, 0);
2017
2018         if (!status) {
2019                 update_changeattr(old_dir, &res.old_cinfo);
2020                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2021                 update_changeattr(new_dir, &res.new_cinfo);
2022                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2023         }
2024         return status;
2025 }
2026
2027 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2028                 struct inode *new_dir, struct qstr *new_name)
2029 {
2030         struct nfs4_exception exception = { };
2031         int err;
2032         do {
2033                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2034                                 _nfs4_proc_rename(old_dir, old_name,
2035                                         new_dir, new_name),
2036                                 &exception);
2037         } while (exception.retry);
2038         return err;
2039 }
2040
2041 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2042 {
2043         struct nfs_server *server = NFS_SERVER(inode);
2044         struct nfs4_link_arg arg = {
2045                 .fh     = NFS_FH(inode),
2046                 .dir_fh = NFS_FH(dir),
2047                 .name   = name,
2048                 .bitmask = server->attr_bitmask,
2049         };
2050         struct nfs_fattr fattr, dir_attr;
2051         struct nfs4_link_res res = {
2052                 .server = server,
2053                 .fattr = &fattr,
2054                 .dir_attr = &dir_attr,
2055         };
2056         struct rpc_message msg = {
2057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2058                 .rpc_argp = &arg,
2059                 .rpc_resp = &res,
2060         };
2061         int                     status;
2062
2063         nfs_fattr_init(res.fattr);
2064         nfs_fattr_init(res.dir_attr);
2065         status = rpc_call_sync(server->client, &msg, 0);
2066         if (!status) {
2067                 update_changeattr(dir, &res.cinfo);
2068                 nfs_post_op_update_inode(dir, res.dir_attr);
2069                 nfs_post_op_update_inode(inode, res.fattr);
2070         }
2071
2072         return status;
2073 }
2074
2075 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2076 {
2077         struct nfs4_exception exception = { };
2078         int err;
2079         do {
2080                 err = nfs4_handle_exception(NFS_SERVER(inode),
2081                                 _nfs4_proc_link(inode, dir, name),
2082                                 &exception);
2083         } while (exception.retry);
2084         return err;
2085 }
2086
2087 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2088                 struct page *page, unsigned int len, struct iattr *sattr)
2089 {
2090         struct nfs_server *server = NFS_SERVER(dir);
2091         struct nfs_fh fhandle;
2092         struct nfs_fattr fattr, dir_fattr;
2093         struct nfs4_create_arg arg = {
2094                 .dir_fh = NFS_FH(dir),
2095                 .server = server,
2096                 .name = &dentry->d_name,
2097                 .attrs = sattr,
2098                 .ftype = NF4LNK,
2099                 .bitmask = server->attr_bitmask,
2100         };
2101         struct nfs4_create_res res = {
2102                 .server = server,
2103                 .fh = &fhandle,
2104                 .fattr = &fattr,
2105                 .dir_fattr = &dir_fattr,
2106         };
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2109                 .rpc_argp = &arg,
2110                 .rpc_resp = &res,
2111         };
2112         int                     status;
2113
2114         if (len > NFS4_MAXPATHLEN)
2115                 return -ENAMETOOLONG;
2116
2117         arg.u.symlink.pages = &page;
2118         arg.u.symlink.len = len;
2119         nfs_fattr_init(&fattr);
2120         nfs_fattr_init(&dir_fattr);
2121
2122         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2123         if (!status) {
2124                 update_changeattr(dir, &res.dir_cinfo);
2125                 nfs_post_op_update_inode(dir, res.dir_fattr);
2126                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2127         }
2128         return status;
2129 }
2130
2131 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2132                 struct page *page, unsigned int len, struct iattr *sattr)
2133 {
2134         struct nfs4_exception exception = { };
2135         int err;
2136         do {
2137                 err = nfs4_handle_exception(NFS_SERVER(dir),
2138                                 _nfs4_proc_symlink(dir, dentry, page,
2139                                                         len, sattr),
2140                                 &exception);
2141         } while (exception.retry);
2142         return err;
2143 }
2144
2145 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2146                 struct iattr *sattr)
2147 {
2148         struct nfs_server *server = NFS_SERVER(dir);
2149         struct nfs_fh fhandle;
2150         struct nfs_fattr fattr, dir_fattr;
2151         struct nfs4_create_arg arg = {
2152                 .dir_fh = NFS_FH(dir),
2153                 .server = server,
2154                 .name = &dentry->d_name,
2155                 .attrs = sattr,
2156                 .ftype = NF4DIR,
2157                 .bitmask = server->attr_bitmask,
2158         };
2159         struct nfs4_create_res res = {
2160                 .server = server,
2161                 .fh = &fhandle,
2162                 .fattr = &fattr,
2163                 .dir_fattr = &dir_fattr,
2164         };
2165         struct rpc_message msg = {
2166                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2167                 .rpc_argp = &arg,
2168                 .rpc_resp = &res,
2169         };
2170         int                     status;
2171
2172         nfs_fattr_init(&fattr);
2173         nfs_fattr_init(&dir_fattr);
2174
2175         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2176         if (!status) {
2177                 update_changeattr(dir, &res.dir_cinfo);
2178                 nfs_post_op_update_inode(dir, res.dir_fattr);
2179                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2180         }
2181         return status;
2182 }
2183
2184 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2185                 struct iattr *sattr)
2186 {
2187         struct nfs4_exception exception = { };
2188         int err;
2189         do {
2190                 err = nfs4_handle_exception(NFS_SERVER(dir),
2191                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2192                                 &exception);
2193         } while (exception.retry);
2194         return err;
2195 }
2196
2197 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2198                   u64 cookie, struct page *page, unsigned int count, int plus)
2199 {
2200         struct inode            *dir = dentry->d_inode;
2201         struct nfs4_readdir_arg args = {
2202                 .fh = NFS_FH(dir),
2203                 .pages = &page,
2204                 .pgbase = 0,
2205                 .count = count,
2206                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2207         };
2208         struct nfs4_readdir_res res;
2209         struct rpc_message msg = {
2210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2211                 .rpc_argp = &args,
2212                 .rpc_resp = &res,
2213                 .rpc_cred = cred,
2214         };
2215         int                     status;
2216
2217         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2218                         dentry->d_parent->d_name.name,
2219                         dentry->d_name.name,
2220                         (unsigned long long)cookie);
2221         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2222         res.pgbase = args.pgbase;
2223         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2224         if (status == 0)
2225                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2226
2227         nfs_invalidate_atime(dir);
2228
2229         dprintk("%s: returns %d\n", __FUNCTION__, status);
2230         return status;
2231 }
2232
2233 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2234                   u64 cookie, struct page *page, unsigned int count, int plus)
2235 {
2236         struct nfs4_exception exception = { };
2237         int err;
2238         do {
2239                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2240                                 _nfs4_proc_readdir(dentry, cred, cookie,
2241                                         page, count, plus),
2242                                 &exception);
2243         } while (exception.retry);
2244         return err;
2245 }
2246
2247 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2248                 struct iattr *sattr, dev_t rdev)
2249 {
2250         struct nfs_server *server = NFS_SERVER(dir);
2251         struct nfs_fh fh;
2252         struct nfs_fattr fattr, dir_fattr;
2253         struct nfs4_create_arg arg = {
2254                 .dir_fh = NFS_FH(dir),
2255                 .server = server,
2256                 .name = &dentry->d_name,
2257                 .attrs = sattr,
2258                 .bitmask = server->attr_bitmask,
2259         };
2260         struct nfs4_create_res res = {
2261                 .server = server,
2262                 .fh = &fh,
2263                 .fattr = &fattr,
2264                 .dir_fattr = &dir_fattr,
2265         };
2266         struct rpc_message msg = {
2267                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2268                 .rpc_argp = &arg,
2269                 .rpc_resp = &res,
2270         };
2271         int                     status;
2272         int                     mode = sattr->ia_mode;
2273
2274         nfs_fattr_init(&fattr);
2275         nfs_fattr_init(&dir_fattr);
2276
2277         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2278         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2279         if (S_ISFIFO(mode))
2280                 arg.ftype = NF4FIFO;
2281         else if (S_ISBLK(mode)) {
2282                 arg.ftype = NF4BLK;
2283                 arg.u.device.specdata1 = MAJOR(rdev);
2284                 arg.u.device.specdata2 = MINOR(rdev);
2285         }
2286         else if (S_ISCHR(mode)) {
2287                 arg.ftype = NF4CHR;
2288                 arg.u.device.specdata1 = MAJOR(rdev);
2289                 arg.u.device.specdata2 = MINOR(rdev);
2290         }
2291         else
2292                 arg.ftype = NF4SOCK;
2293
2294         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2295         if (status == 0) {
2296                 update_changeattr(dir, &res.dir_cinfo);
2297                 nfs_post_op_update_inode(dir, res.dir_fattr);
2298                 status = nfs_instantiate(dentry, &fh, &fattr);
2299         }
2300         return status;
2301 }
2302
2303 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2304                 struct iattr *sattr, dev_t rdev)
2305 {
2306         struct nfs4_exception exception = { };
2307         int err;
2308         do {
2309                 err = nfs4_handle_exception(NFS_SERVER(dir),
2310                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2311                                 &exception);
2312         } while (exception.retry);
2313         return err;
2314 }
2315
2316 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2317                  struct nfs_fsstat *fsstat)
2318 {
2319         struct nfs4_statfs_arg args = {
2320                 .fh = fhandle,
2321                 .bitmask = server->attr_bitmask,
2322         };
2323         struct rpc_message msg = {
2324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2325                 .rpc_argp = &args,
2326                 .rpc_resp = fsstat,
2327         };
2328
2329         nfs_fattr_init(fsstat->fattr);
2330         return rpc_call_sync(server->client, &msg, 0);
2331 }
2332
2333 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2334 {
2335         struct nfs4_exception exception = { };
2336         int err;
2337         do {
2338                 err = nfs4_handle_exception(server,
2339                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2340                                 &exception);
2341         } while (exception.retry);
2342         return err;
2343 }
2344
2345 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2346                 struct nfs_fsinfo *fsinfo)
2347 {
2348         struct nfs4_fsinfo_arg args = {
2349                 .fh = fhandle,
2350                 .bitmask = server->attr_bitmask,
2351         };
2352         struct rpc_message msg = {
2353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2354                 .rpc_argp = &args,
2355                 .rpc_resp = fsinfo,
2356         };
2357
2358         return rpc_call_sync(server->client, &msg, 0);
2359 }
2360
2361 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2362 {
2363         struct nfs4_exception exception = { };
2364         int err;
2365
2366         do {
2367                 err = nfs4_handle_exception(server,
2368                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2369                                 &exception);
2370         } while (exception.retry);
2371         return err;
2372 }
2373
2374 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2375 {
2376         nfs_fattr_init(fsinfo->fattr);
2377         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2378 }
2379
2380 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2381                 struct nfs_pathconf *pathconf)
2382 {
2383         struct nfs4_pathconf_arg args = {
2384                 .fh = fhandle,
2385                 .bitmask = server->attr_bitmask,
2386         };
2387         struct rpc_message msg = {
2388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2389                 .rpc_argp = &args,
2390                 .rpc_resp = pathconf,
2391         };
2392
2393         /* None of the pathconf attributes are mandatory to implement */
2394         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2395                 memset(pathconf, 0, sizeof(*pathconf));
2396                 return 0;
2397         }
2398
2399         nfs_fattr_init(pathconf->fattr);
2400         return rpc_call_sync(server->client, &msg, 0);
2401 }
2402
2403 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2404                 struct nfs_pathconf *pathconf)
2405 {
2406         struct nfs4_exception exception = { };
2407         int err;
2408
2409         do {
2410                 err = nfs4_handle_exception(server,
2411                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2412                                 &exception);
2413         } while (exception.retry);
2414         return err;
2415 }
2416
2417 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2418 {
2419         struct nfs_server *server = NFS_SERVER(data->inode);
2420
2421         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2422                 rpc_restart_call(task);
2423                 return -EAGAIN;
2424         }
2425
2426         nfs_invalidate_atime(data->inode);
2427         if (task->tk_status > 0)
2428                 renew_lease(server, data->timestamp);
2429         return 0;
2430 }
2431
2432 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2433 {
2434         data->timestamp   = jiffies;
2435         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2436 }
2437
2438 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2439 {
2440         struct inode *inode = data->inode;
2441
2442         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2443                 rpc_restart_call(task);
2444                 return -EAGAIN;
2445         }
2446         if (task->tk_status >= 0) {
2447                 renew_lease(NFS_SERVER(inode), data->timestamp);
2448                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2449         }
2450         return 0;
2451 }
2452
2453 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2454 {
2455         struct nfs_server *server = NFS_SERVER(data->inode);
2456
2457         data->args.bitmask = server->attr_bitmask;
2458         data->res.server = server;
2459         data->timestamp   = jiffies;
2460
2461         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2462 }
2463
2464 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2465 {
2466         struct inode *inode = data->inode;
2467
2468         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2469                 rpc_restart_call(task);
2470                 return -EAGAIN;
2471         }
2472         nfs_refresh_inode(inode, data->res.fattr);
2473         return 0;
2474 }
2475
2476 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2477 {
2478         struct nfs_server *server = NFS_SERVER(data->inode);
2479
2480         data->args.bitmask = server->attr_bitmask;
2481         data->res.server = server;
2482         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2483 }
2484
2485 /*
2486  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2487  * standalone procedure for queueing an asynchronous RENEW.
2488  */
2489 static void nfs4_renew_done(struct rpc_task *task, void *data)
2490 {
2491         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2492         unsigned long timestamp = (unsigned long)data;
2493
2494         if (task->tk_status < 0) {
2495                 switch (task->tk_status) {
2496                         case -NFS4ERR_STALE_CLIENTID:
2497                         case -NFS4ERR_EXPIRED:
2498                         case -NFS4ERR_CB_PATH_DOWN:
2499                                 nfs4_schedule_state_recovery(clp);
2500                 }
2501                 return;
2502         }
2503         spin_lock(&clp->cl_lock);
2504         if (time_before(clp->cl_last_renewal,timestamp))
2505                 clp->cl_last_renewal = timestamp;
2506         spin_unlock(&clp->cl_lock);
2507 }
2508
2509 static const struct rpc_call_ops nfs4_renew_ops = {
2510         .rpc_call_done = nfs4_renew_done,
2511 };
2512
2513 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2514 {
2515         struct rpc_message msg = {
2516                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2517                 .rpc_argp       = clp,
2518                 .rpc_cred       = cred,
2519         };
2520
2521         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2522                         &nfs4_renew_ops, (void *)jiffies);
2523 }
2524
2525 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2526 {
2527         struct rpc_message msg = {
2528                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2529                 .rpc_argp       = clp,
2530                 .rpc_cred       = cred,
2531         };
2532         unsigned long now = jiffies;
2533         int status;
2534
2535         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2536         if (status < 0)
2537                 return status;
2538         spin_lock(&clp->cl_lock);
2539         if (time_before(clp->cl_last_renewal,now))
2540                 clp->cl_last_renewal = now;
2541         spin_unlock(&clp->cl_lock);
2542         return 0;
2543 }
2544
2545 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2546 {
2547         return (server->caps & NFS_CAP_ACLS)
2548                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2549                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2550 }
2551
2552 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2553  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2554  * the stack.
2555  */
2556 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2557
2558 static void buf_to_pages(const void *buf, size_t buflen,
2559                 struct page **pages, unsigned int *pgbase)
2560 {
2561         const void *p = buf;
2562
2563         *pgbase = offset_in_page(buf);
2564         p -= *pgbase;
2565         while (p < buf + buflen) {
2566                 *(pages++) = virt_to_page(p);
2567                 p += PAGE_CACHE_SIZE;
2568         }
2569 }
2570
2571 struct nfs4_cached_acl {
2572         int cached;
2573         size_t len;
2574         char data[0];
2575 };
2576
2577 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2578 {
2579         struct nfs_inode *nfsi = NFS_I(inode);
2580
2581         spin_lock(&inode->i_lock);
2582         kfree(nfsi->nfs4_acl);
2583         nfsi->nfs4_acl = acl;
2584         spin_unlock(&inode->i_lock);
2585 }
2586
2587 static void nfs4_zap_acl_attr(struct inode *inode)
2588 {
2589         nfs4_set_cached_acl(inode, NULL);
2590 }
2591
2592 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2593 {
2594         struct nfs_inode *nfsi = NFS_I(inode);
2595         struct nfs4_cached_acl *acl;
2596         int ret = -ENOENT;
2597
2598         spin_lock(&inode->i_lock);
2599         acl = nfsi->nfs4_acl;
2600         if (acl == NULL)
2601                 goto out;
2602         if (buf == NULL) /* user is just asking for length */
2603                 goto out_len;
2604         if (acl->cached == 0)
2605                 goto out;
2606         ret = -ERANGE; /* see getxattr(2) man page */
2607         if (acl->len > buflen)
2608                 goto out;
2609         memcpy(buf, acl->data, acl->len);
2610 out_len:
2611         ret = acl->len;
2612 out:
2613         spin_unlock(&inode->i_lock);
2614         return ret;
2615 }
2616
2617 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2618 {
2619         struct nfs4_cached_acl *acl;
2620
2621         if (buf && acl_len <= PAGE_SIZE) {
2622                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2623                 if (acl == NULL)
2624                         goto out;
2625                 acl->cached = 1;
2626                 memcpy(acl->data, buf, acl_len);
2627         } else {
2628                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2629                 if (acl == NULL)
2630                         goto out;
2631                 acl->cached = 0;
2632         }
2633         acl->len = acl_len;
2634 out:
2635         nfs4_set_cached_acl(inode, acl);
2636 }
2637
2638 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2639 {
2640         struct page *pages[NFS4ACL_MAXPAGES];
2641         struct nfs_getaclargs args = {
2642                 .fh = NFS_FH(inode),
2643                 .acl_pages = pages,
2644                 .acl_len = buflen,
2645         };
2646         size_t resp_len = buflen;
2647         void *resp_buf;
2648         struct rpc_message msg = {
2649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2650                 .rpc_argp = &args,
2651                 .rpc_resp = &resp_len,
2652         };
2653         struct page *localpage = NULL;
2654         int ret;
2655
2656         if (buflen < PAGE_SIZE) {
2657                 /* As long as we're doing a round trip to the server anyway,
2658                  * let's be prepared for a page of acl data. */
2659                 localpage = alloc_page(GFP_KERNEL);
2660                 resp_buf = page_address(localpage);
2661                 if (localpage == NULL)
2662                         return -ENOMEM;
2663                 args.acl_pages[0] = localpage;
2664                 args.acl_pgbase = 0;
2665                 resp_len = args.acl_len = PAGE_SIZE;
2666         } else {
2667                 resp_buf = buf;
2668                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2669         }
2670         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2671         if (ret)
2672                 goto out_free;
2673         if (resp_len > args.acl_len)
2674                 nfs4_write_cached_acl(inode, NULL, resp_len);
2675         else
2676                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2677         if (buf) {
2678                 ret = -ERANGE;
2679                 if (resp_len > buflen)
2680                         goto out_free;
2681                 if (localpage)
2682                         memcpy(buf, resp_buf, resp_len);
2683         }
2684         ret = resp_len;
2685 out_free:
2686         if (localpage)
2687                 __free_page(localpage);
2688         return ret;
2689 }
2690
2691 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2692 {
2693         struct nfs4_exception exception = { };
2694         ssize_t ret;
2695         do {
2696                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2697                 if (ret >= 0)
2698                         break;
2699                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2700         } while (exception.retry);
2701         return ret;
2702 }
2703
2704 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2705 {
2706         struct nfs_server *server = NFS_SERVER(inode);
2707         int ret;
2708
2709         if (!nfs4_server_supports_acls(server))
2710                 return -EOPNOTSUPP;
2711         ret = nfs_revalidate_inode(server, inode);
2712         if (ret < 0)
2713                 return ret;
2714         ret = nfs4_read_cached_acl(inode, buf, buflen);
2715         if (ret != -ENOENT)
2716                 return ret;
2717         return nfs4_get_acl_uncached(inode, buf, buflen);
2718 }
2719
2720 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2721 {
2722         struct nfs_server *server = NFS_SERVER(inode);
2723         struct page *pages[NFS4ACL_MAXPAGES];
2724         struct nfs_setaclargs arg = {
2725                 .fh             = NFS_FH(inode),
2726                 .acl_pages      = pages,
2727                 .acl_len        = buflen,
2728         };
2729         struct rpc_message msg = {
2730                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2731                 .rpc_argp       = &arg,
2732                 .rpc_resp       = NULL,
2733         };
2734         int ret;
2735
2736         if (!nfs4_server_supports_acls(server))
2737                 return -EOPNOTSUPP;
2738         nfs_inode_return_delegation(inode);
2739         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2740         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2741         nfs_zap_caches(inode);
2742         return ret;
2743 }
2744
2745 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2746 {
2747         struct nfs4_exception exception = { };
2748         int err;
2749         do {
2750                 err = nfs4_handle_exception(NFS_SERVER(inode),
2751                                 __nfs4_proc_set_acl(inode, buf, buflen),
2752                                 &exception);
2753         } while (exception.retry);
2754         return err;
2755 }
2756
2757 static int
2758 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2759 {
2760         struct nfs_client *clp = server->nfs_client;
2761
2762         if (!clp || task->tk_status >= 0)
2763                 return 0;
2764         switch(task->tk_status) {
2765                 case -NFS4ERR_STALE_CLIENTID:
2766                 case -NFS4ERR_STALE_STATEID:
2767                 case -NFS4ERR_EXPIRED:
2768                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2769                         nfs4_schedule_state_recovery(clp);
2770                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2771                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2772                         task->tk_status = 0;
2773                         return -EAGAIN;
2774                 case -NFS4ERR_DELAY:
2775                         nfs_inc_server_stats((struct nfs_server *) server,
2776                                                 NFSIOS_DELAY);
2777                 case -NFS4ERR_GRACE:
2778                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2779                         task->tk_status = 0;
2780                         return -EAGAIN;
2781                 case -NFS4ERR_OLD_STATEID:
2782                         task->tk_status = 0;
2783                         return -EAGAIN;
2784         }
2785         task->tk_status = nfs4_map_errors(task->tk_status);
2786         return 0;
2787 }
2788
2789 static int nfs4_wait_bit_killable(void *word)
2790 {
2791         if (fatal_signal_pending(current))
2792                 return -ERESTARTSYS;
2793         schedule();
2794         return 0;
2795 }
2796
2797 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2798 {
2799         int res;
2800
2801         might_sleep();
2802
2803         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2804
2805         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2806                         nfs4_wait_bit_killable, TASK_KILLABLE);
2807
2808         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2809         return res;
2810 }
2811
2812 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2813 {
2814         int res = 0;
2815
2816         might_sleep();
2817
2818         if (*timeout <= 0)
2819                 *timeout = NFS4_POLL_RETRY_MIN;
2820         if (*timeout > NFS4_POLL_RETRY_MAX)
2821                 *timeout = NFS4_POLL_RETRY_MAX;
2822         schedule_timeout_killable(*timeout);
2823         if (fatal_signal_pending(current))
2824                 res = -ERESTARTSYS;
2825         *timeout <<= 1;
2826         return res;
2827 }
2828
2829 /* This is the error handling routine for processes that are allowed
2830  * to sleep.
2831  */
2832 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2833 {
2834         struct nfs_client *clp = server->nfs_client;
2835         int ret = errorcode;
2836
2837         exception->retry = 0;
2838         switch(errorcode) {
2839                 case 0:
2840                         return 0;
2841                 case -NFS4ERR_STALE_CLIENTID:
2842                 case -NFS4ERR_STALE_STATEID:
2843                 case -NFS4ERR_EXPIRED:
2844                         nfs4_schedule_state_recovery(clp);
2845                         ret = nfs4_wait_clnt_recover(server->client, clp);
2846                         if (ret == 0)
2847                                 exception->retry = 1;
2848                         break;
2849                 case -NFS4ERR_FILE_OPEN:
2850                 case -NFS4ERR_GRACE:
2851                 case -NFS4ERR_DELAY:
2852                         ret = nfs4_delay(server->client, &exception->timeout);
2853                         if (ret != 0)
2854                                 break;
2855                 case -NFS4ERR_OLD_STATEID:
2856                         exception->retry = 1;
2857         }
2858         /* We failed to handle the error */
2859         return nfs4_map_errors(ret);
2860 }
2861
2862 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2863 {
2864         nfs4_verifier sc_verifier;
2865         struct nfs4_setclientid setclientid = {
2866                 .sc_verifier = &sc_verifier,
2867                 .sc_prog = program,
2868         };
2869         struct rpc_message msg = {
2870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2871                 .rpc_argp = &setclientid,
2872                 .rpc_resp = clp,
2873                 .rpc_cred = cred,
2874         };
2875         __be32 *p;
2876         int loop = 0;
2877         int status;
2878
2879         p = (__be32*)sc_verifier.data;
2880         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2881         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2882
2883         for(;;) {
2884                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2885                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2886                                 clp->cl_ipaddr,
2887                                 rpc_peeraddr2str(clp->cl_rpcclient,
2888                                                         RPC_DISPLAY_ADDR),
2889                                 rpc_peeraddr2str(clp->cl_rpcclient,
2890                                                         RPC_DISPLAY_PROTO),
2891                                 cred->cr_ops->cr_name,
2892                                 clp->cl_id_uniquifier);
2893                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2894                                 sizeof(setclientid.sc_netid),
2895                                 rpc_peeraddr2str(clp->cl_rpcclient,
2896                                                         RPC_DISPLAY_NETID));
2897                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2898                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2899                                 clp->cl_ipaddr, port >> 8, port & 255);
2900
2901                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2902                 if (status != -NFS4ERR_CLID_INUSE)
2903                         break;
2904                 if (signalled())
2905                         break;
2906                 if (loop++ & 1)
2907                         ssleep(clp->cl_lease_time + 1);
2908                 else
2909                         if (++clp->cl_id_uniquifier == 0)
2910                                 break;
2911         }
2912         return status;
2913 }
2914
2915 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2916 {
2917         struct nfs_fsinfo fsinfo;
2918         struct rpc_message msg = {
2919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2920                 .rpc_argp = clp,
2921                 .rpc_resp = &fsinfo,
2922                 .rpc_cred = cred,
2923         };
2924         unsigned long now;
2925         int status;
2926
2927         now = jiffies;
2928         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2929         if (status == 0) {
2930                 spin_lock(&clp->cl_lock);
2931                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2932                 clp->cl_last_renewal = now;
2933                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2934                 spin_unlock(&clp->cl_lock);
2935         }
2936         return status;
2937 }
2938
2939 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2940 {
2941         long timeout;
2942         int err;
2943         do {
2944                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2945                 switch (err) {
2946                         case 0:
2947                                 return err;
2948                         case -NFS4ERR_RESOURCE:
2949                                 /* The IBM lawyers misread another document! */
2950                         case -NFS4ERR_DELAY:
2951                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2952                 }
2953         } while (err == 0);
2954         return err;
2955 }
2956
2957 struct nfs4_delegreturndata {
2958         struct nfs4_delegreturnargs args;
2959         struct nfs4_delegreturnres res;
2960         struct nfs_fh fh;
2961         nfs4_stateid stateid;
2962         unsigned long timestamp;
2963         struct nfs_fattr fattr;
2964         int rpc_status;
2965 };
2966
2967 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2968 {
2969         struct nfs4_delegreturndata *data = calldata;
2970         data->rpc_status = task->tk_status;
2971         if (data->rpc_status == 0)
2972                 renew_lease(data->res.server, data->timestamp);
2973 }
2974
2975 static void nfs4_delegreturn_release(void *calldata)
2976 {
2977         kfree(calldata);
2978 }
2979
2980 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2981         .rpc_call_done = nfs4_delegreturn_done,
2982         .rpc_release = nfs4_delegreturn_release,
2983 };
2984
2985 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2986 {
2987         struct nfs4_delegreturndata *data;
2988         struct nfs_server *server = NFS_SERVER(inode);
2989         struct rpc_task *task;
2990         struct rpc_message msg = {
2991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2992                 .rpc_cred = cred,
2993         };
2994         struct rpc_task_setup task_setup_data = {
2995                 .rpc_client = server->client,
2996                 .rpc_message = &msg,
2997                 .callback_ops = &nfs4_delegreturn_ops,
2998                 .flags = RPC_TASK_ASYNC,
2999         };
3000         int status = 0;
3001
3002         data = kmalloc(sizeof(*data), GFP_KERNEL);
3003         if (data == NULL)
3004                 return -ENOMEM;
3005         data->args.fhandle = &data->fh;
3006         data->args.stateid = &data->stateid;
3007         data->args.bitmask = server->attr_bitmask;
3008         nfs_copy_fh(&data->fh, NFS_FH(inode));
3009         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3010         data->res.fattr = &data->fattr;
3011         data->res.server = server;
3012         nfs_fattr_init(data->res.fattr);
3013         data->timestamp = jiffies;
3014         data->rpc_status = 0;
3015
3016         task_setup_data.callback_data = data;
3017         msg.rpc_argp = &data->args,
3018         msg.rpc_resp = &data->res,
3019         task = rpc_run_task(&task_setup_data);
3020         if (IS_ERR(task))
3021                 return PTR_ERR(task);
3022         if (!issync)
3023                 goto out;
3024         status = nfs4_wait_for_completion_rpc_task(task);
3025         if (status != 0)
3026                 goto out;
3027         status = data->rpc_status;
3028         if (status != 0)
3029                 goto out;
3030         nfs_refresh_inode(inode, &data->fattr);
3031 out:
3032         rpc_put_task(task);
3033         return status;
3034 }
3035
3036 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3037 {
3038         struct nfs_server *server = NFS_SERVER(inode);
3039         struct nfs4_exception exception = { };
3040         int err;
3041         do {
3042                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3043                 switch (err) {
3044                         case -NFS4ERR_STALE_STATEID:
3045                         case -NFS4ERR_EXPIRED:
3046                         case 0:
3047                                 return 0;
3048                 }
3049                 err = nfs4_handle_exception(server, err, &exception);
3050         } while (exception.retry);
3051         return err;
3052 }
3053
3054 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3055 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3056
3057 /*
3058  * sleep, with exponential backoff, and retry the LOCK operation.
3059  */
3060 static unsigned long
3061 nfs4_set_lock_task_retry(unsigned long timeout)
3062 {
3063         schedule_timeout_killable(timeout);
3064         timeout <<= 1;
3065         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3066                 return NFS4_LOCK_MAXTIMEOUT;
3067         return timeout;
3068 }
3069
3070 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3071 {
3072         struct inode *inode = state->inode;
3073         struct nfs_server *server = NFS_SERVER(inode);
3074         struct nfs_client *clp = server->nfs_client;
3075         struct nfs_lockt_args arg = {
3076                 .fh = NFS_FH(inode),
3077                 .fl = request,
3078         };
3079         struct nfs_lockt_res res = {
3080                 .denied = request,
3081         };
3082         struct rpc_message msg = {
3083                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3084                 .rpc_argp       = &arg,
3085                 .rpc_resp       = &res,
3086                 .rpc_cred       = state->owner->so_cred,
3087         };
3088         struct nfs4_lock_state *lsp;
3089         int status;
3090
3091         down_read(&clp->cl_sem);
3092         arg.lock_owner.clientid = clp->cl_clientid;
3093         status = nfs4_set_lock_state(state, request);
3094         if (status != 0)
3095                 goto out;
3096         lsp = request->fl_u.nfs4_fl.owner;
3097         arg.lock_owner.id = lsp->ls_id.id;
3098         status = rpc_call_sync(server->client, &msg, 0);
3099         switch (status) {
3100                 case 0:
3101                         request->fl_type = F_UNLCK;
3102                         break;
3103                 case -NFS4ERR_DENIED:
3104                         status = 0;
3105         }
3106         request->fl_ops->fl_release_private(request);
3107 out:
3108         up_read(&clp->cl_sem);
3109         return status;
3110 }
3111
3112 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3113 {
3114         struct nfs4_exception exception = { };
3115         int err;
3116
3117         do {
3118                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3119                                 _nfs4_proc_getlk(state, cmd, request),
3120                                 &exception);
3121         } while (exception.retry);
3122         return err;
3123 }
3124
3125 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3126 {
3127         int res = 0;
3128         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3129                 case FL_POSIX:
3130                         res = posix_lock_file_wait(file, fl);
3131                         break;
3132                 case FL_FLOCK:
3133                         res = flock_lock_file_wait(file, fl);
3134                         break;
3135                 default:
3136                         BUG();
3137         }
3138         return res;
3139 }
3140
3141 struct nfs4_unlockdata {
3142         struct nfs_locku_args arg;
3143         struct nfs_locku_res res;
3144         struct nfs4_lock_state *lsp;
3145         struct nfs_open_context *ctx;
3146         struct file_lock fl;
3147         const struct nfs_server *server;
3148         unsigned long timestamp;
3149 };
3150
3151 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3152                 struct nfs_open_context *ctx,
3153                 struct nfs4_lock_state *lsp,
3154                 struct nfs_seqid *seqid)
3155 {
3156         struct nfs4_unlockdata *p;
3157         struct inode *inode = lsp->ls_state->inode;
3158
3159         p = kmalloc(sizeof(*p), GFP_KERNEL);
3160         if (p == NULL)
3161                 return NULL;
3162         p->arg.fh = NFS_FH(inode);
3163         p->arg.fl = &p->fl;
3164         p->arg.seqid = seqid;
3165         p->arg.stateid = &lsp->ls_stateid;
3166         p->lsp = lsp;
3167         atomic_inc(&lsp->ls_count);
3168         /* Ensure we don't close file until we're done freeing locks! */
3169         p->ctx = get_nfs_open_context(ctx);
3170         memcpy(&p->fl, fl, sizeof(p->fl));
3171         p->server = NFS_SERVER(inode);
3172         return p;
3173 }
3174
3175 static void nfs4_locku_release_calldata(void *data)
3176 {
3177         struct nfs4_unlockdata *calldata = data;
3178         nfs_free_seqid(calldata->arg.seqid);
3179         nfs4_put_lock_state(calldata->lsp);
3180         put_nfs_open_context(calldata->ctx);
3181         kfree(calldata);
3182 }
3183
3184 static void nfs4_locku_done(struct rpc_task *task, void *data)
3185 {
3186         struct nfs4_unlockdata *calldata = data;
3187
3188         if (RPC_ASSASSINATED(task))
3189                 return;
3190         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3191         switch (task->tk_status) {
3192                 case 0:
3193                         memcpy(calldata->lsp->ls_stateid.data,
3194                                         calldata->res.stateid.data,
3195                                         sizeof(calldata->lsp->ls_stateid.data));
3196                         renew_lease(calldata->server, calldata->timestamp);
3197                         break;
3198                 case -NFS4ERR_STALE_STATEID:
3199                 case -NFS4ERR_EXPIRED:
3200                         break;
3201                 default:
3202                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3203                                 rpc_restart_call(task);
3204         }
3205 }
3206
3207 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3208 {
3209         struct nfs4_unlockdata *calldata = data;
3210
3211         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3212                 return;
3213         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3214                 /* Note: exit _without_ running nfs4_locku_done */
3215                 task->tk_action = NULL;
3216                 return;
3217         }
3218         calldata->timestamp = jiffies;
3219         rpc_call_start(task);
3220 }
3221
3222 static const struct rpc_call_ops nfs4_locku_ops = {
3223         .rpc_call_prepare = nfs4_locku_prepare,
3224         .rpc_call_done = nfs4_locku_done,
3225         .rpc_release = nfs4_locku_release_calldata,
3226 };
3227
3228 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3229                 struct nfs_open_context *ctx,
3230                 struct nfs4_lock_state *lsp,
3231                 struct nfs_seqid *seqid)
3232 {
3233         struct nfs4_unlockdata *data;
3234         struct rpc_message msg = {
3235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3236                 .rpc_cred = ctx->cred,
3237         };
3238         struct rpc_task_setup task_setup_data = {
3239                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3240                 .rpc_message = &msg,
3241                 .callback_ops = &nfs4_locku_ops,
3242                 .workqueue = nfsiod_workqueue,
3243                 .flags = RPC_TASK_ASYNC,
3244         };
3245
3246         /* Ensure this is an unlock - when canceling a lock, the
3247          * canceled lock is passed in, and it won't be an unlock.
3248          */
3249         fl->fl_type = F_UNLCK;
3250
3251         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3252         if (data == NULL) {
3253                 nfs_free_seqid(seqid);
3254                 return ERR_PTR(-ENOMEM);
3255         }
3256
3257         msg.rpc_argp = &data->arg,
3258         msg.rpc_resp = &data->res,
3259         task_setup_data.callback_data = data;
3260         return rpc_run_task(&task_setup_data);
3261 }
3262
3263 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3264 {
3265         struct nfs_seqid *seqid;
3266         struct nfs4_lock_state *lsp;
3267         struct rpc_task *task;
3268         int status = 0;
3269
3270         status = nfs4_set_lock_state(state, request);
3271         /* Unlock _before_ we do the RPC call */
3272         request->fl_flags |= FL_EXISTS;
3273         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3274                 goto out;
3275         if (status != 0)
3276                 goto out;
3277         /* Is this a delegated lock? */
3278         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3279                 goto out;
3280         lsp = request->fl_u.nfs4_fl.owner;
3281         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3282         status = -ENOMEM;
3283         if (seqid == NULL)
3284                 goto out;
3285         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3286         status = PTR_ERR(task);
3287         if (IS_ERR(task))
3288                 goto out;
3289         status = nfs4_wait_for_completion_rpc_task(task);
3290         rpc_put_task(task);
3291 out:
3292         return status;
3293 }
3294
3295 struct nfs4_lockdata {
3296         struct nfs_lock_args arg;
3297         struct nfs_lock_res res;
3298         struct nfs4_lock_state *lsp;
3299         struct nfs_open_context *ctx;
3300         struct file_lock fl;
3301         unsigned long timestamp;
3302         int rpc_status;
3303         int cancelled;
3304 };
3305
3306 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3307                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3308 {
3309         struct nfs4_lockdata *p;
3310         struct inode *inode = lsp->ls_state->inode;
3311         struct nfs_server *server = NFS_SERVER(inode);
3312
3313         p = kzalloc(sizeof(*p), GFP_KERNEL);
3314         if (p == NULL)
3315                 return NULL;
3316
3317         p->arg.fh = NFS_FH(inode);
3318         p->arg.fl = &p->fl;
3319         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3320         if (p->arg.open_seqid == NULL)
3321                 goto out_free;
3322         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3323         if (p->arg.lock_seqid == NULL)
3324                 goto out_free_seqid;
3325         p->arg.lock_stateid = &lsp->ls_stateid;
3326         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3327         p->arg.lock_owner.id = lsp->ls_id.id;
3328         p->lsp = lsp;
3329         atomic_inc(&lsp->ls_count);
3330         p->ctx = get_nfs_open_context(ctx);
3331         memcpy(&p->fl, fl, sizeof(p->fl));
3332         return p;
3333 out_free_seqid:
3334         nfs_free_seqid(p->arg.open_seqid);
3335 out_free:
3336         kfree(p);
3337         return NULL;
3338 }
3339
3340 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3341 {
3342         struct nfs4_lockdata *data = calldata;
3343         struct nfs4_state *state = data->lsp->ls_state;
3344
3345         dprintk("%s: begin!\n", __FUNCTION__);
3346         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3347                 return;
3348         /* Do we need to do an open_to_lock_owner? */
3349         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3350                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3351                         return;
3352                 data->arg.open_stateid = &state->stateid;
3353                 data->arg.new_lock_owner = 1;
3354         } else
3355                 data->arg.new_lock_owner = 0;
3356         data->timestamp = jiffies;
3357         rpc_call_start(task);
3358         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3359 }
3360
3361 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3362 {
3363         struct nfs4_lockdata *data = calldata;
3364
3365         dprintk("%s: begin!\n", __FUNCTION__);
3366
3367         data->rpc_status = task->tk_status;
3368         if (RPC_ASSASSINATED(task))
3369                 goto out;
3370         if (data->arg.new_lock_owner != 0) {
3371                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3372                 if (data->rpc_status == 0)
3373                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3374                 else
3375                         goto out;
3376         }
3377         if (data->rpc_status == 0) {
3378                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3379                                         sizeof(data->lsp->ls_stateid.data));
3380                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3381                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3382         }
3383         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3384 out:
3385         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3386 }
3387
3388 static void nfs4_lock_release(void *calldata)
3389 {
3390         struct nfs4_lockdata *data = calldata;
3391
3392         dprintk("%s: begin!\n", __FUNCTION__);
3393         nfs_free_seqid(data->arg.open_seqid);
3394         if (data->cancelled != 0) {
3395                 struct rpc_task *task;
3396                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3397                                 data->arg.lock_seqid);
3398                 if (!IS_ERR(task))
3399                         rpc_put_task(task);
3400                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3401         } else
3402                 nfs_free_seqid(data->arg.lock_seqid);
3403         nfs4_put_lock_state(data->lsp);
3404         put_nfs_open_context(data->ctx);
3405         kfree(data);
3406         dprintk("%s: done!\n", __FUNCTION__);
3407 }
3408
3409 static const struct rpc_call_ops nfs4_lock_ops = {
3410         .rpc_call_prepare = nfs4_lock_prepare,
3411         .rpc_call_done = nfs4_lock_done,
3412         .rpc_release = nfs4_lock_release,
3413 };
3414
3415 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3416 {
3417         struct nfs4_lockdata *data;
3418         struct rpc_task *task;
3419         struct rpc_message msg = {
3420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3421                 .rpc_cred = state->owner->so_cred,
3422         };
3423         struct rpc_task_setup task_setup_data = {
3424                 .rpc_client = NFS_CLIENT(state->inode),
3425                 .rpc_message = &msg,
3426                 .callback_ops = &nfs4_lock_ops,
3427                 .workqueue = nfsiod_workqueue,
3428                 .flags = RPC_TASK_ASYNC,
3429         };
3430         int ret;
3431
3432         dprintk("%s: begin!\n", __FUNCTION__);
3433         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3434                         fl->fl_u.nfs4_fl.owner);
3435         if (data == NULL)
3436                 return -ENOMEM;
3437         if (IS_SETLKW(cmd))
3438                 data->arg.block = 1;
3439         if (reclaim != 0)
3440                 data->arg.reclaim = 1;
3441         msg.rpc_argp = &data->arg,
3442         msg.rpc_resp = &data->res,
3443         task_setup_data.callback_data = data;
3444         task = rpc_run_task(&task_setup_data);
3445         if (IS_ERR(task))
3446                 return PTR_ERR(task);
3447         ret = nfs4_wait_for_completion_rpc_task(task);
3448         if (ret == 0) {
3449                 ret = data->rpc_status;
3450                 if (ret == -NFS4ERR_DENIED)
3451                         ret = -EAGAIN;
3452         } else
3453                 data->cancelled = 1;
3454         rpc_put_task(task);
3455         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3456         return ret;
3457 }
3458
3459 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3460 {
3461         struct nfs_server *server = NFS_SERVER(state->inode);
3462         struct nfs4_exception exception = { };
3463         int err;
3464
3465         do {
3466                 /* Cache the lock if possible... */
3467                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3468                         return 0;
3469                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3470                 if (err != -NFS4ERR_DELAY)
3471                         break;
3472                 nfs4_handle_exception(server, err, &exception);
3473         } while (exception.retry);
3474         return err;
3475 }
3476
3477 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3478 {
3479         struct nfs_server *server = NFS_SERVER(state->inode);
3480         struct nfs4_exception exception = { };
3481         int err;
3482
3483         err = nfs4_set_lock_state(state, request);
3484         if (err != 0)
3485                 return err;
3486         do {
3487                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3488                         return 0;
3489                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3490                 if (err != -NFS4ERR_DELAY)
3491                         break;
3492                 nfs4_handle_exception(server, err, &exception);
3493         } while (exception.retry);
3494         return err;
3495 }
3496
3497 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3498 {
3499         struct nfs_client *clp = state->owner->so_client;
3500         unsigned char fl_flags = request->fl_flags;
3501         int status;
3502
3503         /* Is this a delegated open? */
3504         status = nfs4_set_lock_state(state, request);
3505         if (status != 0)
3506                 goto out;
3507         request->fl_flags |= FL_ACCESS;
3508         status = do_vfs_lock(request->fl_file, request);
3509         if (status < 0)
3510                 goto out;
3511         down_read(&clp->cl_sem);
3512         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3513                 struct nfs_inode *nfsi = NFS_I(state->inode);
3514                 /* Yes: cache locks! */
3515                 down_read(&nfsi->rwsem);
3516                 /* ...but avoid races with delegation recall... */
3517                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3518                         request->fl_flags = fl_flags & ~FL_SLEEP;
3519                         status = do_vfs_lock(request->fl_file, request);
3520                         up_read(&nfsi->rwsem);
3521                         goto out_unlock;
3522                 }
3523                 up_read(&nfsi->rwsem);
3524         }
3525         status = _nfs4_do_setlk(state, cmd, request, 0);
3526         if (status != 0)
3527                 goto out_unlock;
3528         /* Note: we always want to sleep here! */
3529         request->fl_flags = fl_flags | FL_SLEEP;
3530         if (do_vfs_lock(request->fl_file, request) < 0)
3531                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3532 out_unlock:
3533         up_read(&clp->cl_sem);
3534 out:
3535         request->fl_flags = fl_flags;
3536         return status;
3537 }
3538
3539 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3540 {
3541         struct nfs4_exception exception = { };
3542         int err;
3543
3544         do {
3545                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3546                                 _nfs4_proc_setlk(state, cmd, request),
3547                                 &exception);
3548         } while (exception.retry);
3549         return err;
3550 }
3551
3552 static int
3553 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3554 {
3555         struct nfs_open_context *ctx;
3556         struct nfs4_state *state;
3557         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3558         int status;
3559
3560         /* verify open state */
3561         ctx = nfs_file_open_context(filp);
3562         state = ctx->state;
3563
3564         if (request->fl_start < 0 || request->fl_end < 0)
3565                 return -EINVAL;
3566
3567         if (IS_GETLK(cmd))
3568                 return nfs4_proc_getlk(state, F_GETLK, request);
3569
3570         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3571                 return -EINVAL;
3572
3573         if (request->fl_type == F_UNLCK)
3574                 return nfs4_proc_unlck(state, cmd, request);
3575
3576         do {
3577                 status = nfs4_proc_setlk(state, cmd, request);
3578                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3579                         break;
3580                 timeout = nfs4_set_lock_task_retry(timeout);
3581                 status = -ERESTARTSYS;
3582                 if (signalled())
3583                         break;
3584         } while(status < 0);
3585         return status;
3586 }
3587
3588 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3589 {
3590         struct nfs_server *server = NFS_SERVER(state->inode);
3591         struct nfs4_exception exception = { };
3592         int err;
3593
3594         err = nfs4_set_lock_state(state, fl);
3595         if (err != 0)
3596                 goto out;
3597         do {
3598                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3599                 if (err != -NFS4ERR_DELAY)
3600                         break;
3601                 err = nfs4_handle_exception(server, err, &exception);
3602         } while (exception.retry);
3603 out:
3604         return err;
3605 }
3606
3607 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3608
3609 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3610                 size_t buflen, int flags)
3611 {
3612         struct inode *inode = dentry->d_inode;
3613
3614         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3615                 return -EOPNOTSUPP;
3616
3617         return nfs4_proc_set_acl(inode, buf, buflen);
3618 }
3619
3620 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3621  * and that's what we'll do for e.g. user attributes that haven't been set.
3622  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3623  * attributes in kernel-managed attribute namespaces. */
3624 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3625                 size_t buflen)
3626 {
3627         struct inode *inode = dentry->d_inode;
3628
3629         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3630                 return -EOPNOTSUPP;
3631
3632         return nfs4_proc_get_acl(inode, buf, buflen);
3633 }
3634
3635 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3636 {
3637         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3638
3639         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3640                 return 0;
3641         if (buf && buflen < len)
3642                 return -ERANGE;
3643         if (buf)
3644                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3645         return len;
3646 }
3647
3648 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3649                 struct nfs4_fs_locations *fs_locations, struct page *page)
3650 {
3651         struct nfs_server *server = NFS_SERVER(dir);
3652         u32 bitmask[2] = {
3653                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3654                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3655         };
3656         struct nfs4_fs_locations_arg args = {
3657                 .dir_fh = NFS_FH(dir),
3658                 .name = name,
3659                 .page = page,
3660                 .bitmask = bitmask,
3661         };
3662         struct rpc_message msg = {
3663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3664                 .rpc_argp = &args,
3665                 .rpc_resp = fs_locations,
3666         };
3667         int status;
3668
3669         dprintk("%s: start\n", __FUNCTION__);
3670         nfs_fattr_init(&fs_locations->fattr);
3671         fs_locations->server = server;
3672         fs_locations->nlocations = 0;
3673         status = rpc_call_sync(server->client, &msg, 0);
3674         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3675         return status;
3676 }
3677
3678 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3679         .recover_open   = nfs4_open_reclaim,
3680         .recover_lock   = nfs4_lock_reclaim,
3681 };
3682
3683 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3684         .recover_open   = nfs4_open_expired,
3685         .recover_lock   = nfs4_lock_expired,
3686 };
3687
3688 static const struct inode_operations nfs4_file_inode_operations = {
3689         .permission     = nfs_permission,
3690         .getattr        = nfs_getattr,
3691         .setattr        = nfs_setattr,
3692         .getxattr       = nfs4_getxattr,
3693         .setxattr       = nfs4_setxattr,
3694         .listxattr      = nfs4_listxattr,
3695 };
3696
3697 const struct nfs_rpc_ops nfs_v4_clientops = {
3698         .version        = 4,                    /* protocol version */
3699         .dentry_ops     = &nfs4_dentry_operations,
3700         .dir_inode_ops  = &nfs4_dir_inode_operations,
3701         .file_inode_ops = &nfs4_file_inode_operations,
3702         .getroot        = nfs4_proc_get_root,
3703         .getattr        = nfs4_proc_getattr,
3704         .setattr        = nfs4_proc_setattr,
3705         .lookupfh       = nfs4_proc_lookupfh,
3706         .lookup         = nfs4_proc_lookup,
3707         .access         = nfs4_proc_access,
3708         .readlink       = nfs4_proc_readlink,
3709         .create         = nfs4_proc_create,
3710         .remove         = nfs4_proc_remove,
3711         .unlink_setup   = nfs4_proc_unlink_setup,
3712         .unlink_done    = nfs4_proc_unlink_done,
3713         .rename         = nfs4_proc_rename,
3714         .link           = nfs4_proc_link,
3715         .symlink        = nfs4_proc_symlink,
3716         .mkdir          = nfs4_proc_mkdir,
3717         .rmdir          = nfs4_proc_remove,
3718         .readdir        = nfs4_proc_readdir,
3719         .mknod          = nfs4_proc_mknod,
3720         .statfs         = nfs4_proc_statfs,
3721         .fsinfo         = nfs4_proc_fsinfo,
3722         .pathconf       = nfs4_proc_pathconf,
3723         .set_capabilities = nfs4_server_capabilities,
3724         .decode_dirent  = nfs4_decode_dirent,
3725         .read_setup     = nfs4_proc_read_setup,
3726         .read_done      = nfs4_read_done,
3727         .write_setup    = nfs4_proc_write_setup,
3728         .write_done     = nfs4_write_done,
3729         .commit_setup   = nfs4_proc_commit_setup,
3730         .commit_done    = nfs4_commit_done,
3731         .file_open      = nfs_open,
3732         .file_release   = nfs_release,
3733         .lock           = nfs4_proc_lock,
3734         .clear_acl_cache = nfs4_zap_acl_attr,
3735 };
3736
3737 /*
3738  * Local variables:
3739  *  c-basic-offset: 8
3740  * End:
3741  */