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   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 213                 nfsi->cache_change_attribute = jiffies;
 214         nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         struct kref kref;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct path path;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         unsigned long timestamp;
 232         unsigned int rpc_done : 1;
 233         int rpc_status;
 234         int cancelled;
 235 };
 236
 237
 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 239 {
 240         p->o_res.f_attr = &p->f_attr;
 241         p->o_res.dir_attr = &p->dir_attr;
 242         p->o_res.server = p->o_arg.server;
 243         nfs_fattr_init(&p->f_attr);
 244         nfs_fattr_init(&p->dir_attr);
 245 }
 246
 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 248                 struct nfs4_state_owner *sp, int flags,
 249                 const struct iattr *attrs)
 250 {
 251         struct dentry *parent = dget_parent(path->dentry);
 252         struct inode *dir = parent->d_inode;
 253         struct nfs_server *server = NFS_SERVER(dir);
 254         struct nfs4_opendata *p;
 255
 256         p = kzalloc(sizeof(*p), GFP_KERNEL);
 257         if (p == NULL)
 258                 goto err;
 259         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 260         if (p->o_arg.seqid == NULL)
 261                 goto err_free;
 262         p->path.mnt = mntget(path->mnt);
 263         p->path.dentry = dget(path->dentry);
 264         p->dir = parent;
 265         p->owner = sp;
 266         atomic_inc(&sp->so_count);
 267         p->o_arg.fh = NFS_FH(dir);
 268         p->o_arg.open_flags = flags,
 269         p->o_arg.clientid = server->nfs_client->cl_clientid;
 270         p->o_arg.id = sp->so_owner_id.id;
 271         p->o_arg.name = &p->path.dentry->d_name;
 272         p->o_arg.server = server;
 273         p->o_arg.bitmask = server->attr_bitmask;
 274         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 275         if (flags & O_EXCL) {
 276                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 277                 s[0] = jiffies;
 278                 s[1] = current->pid;
 279         } else if (flags & O_CREAT) {
 280                 p->o_arg.u.attrs = &p->attrs;
 281                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 282         }
 283         p->c_arg.fh = &p->o_res.fh;
 284         p->c_arg.stateid = &p->o_res.stateid;
 285         p->c_arg.seqid = p->o_arg.seqid;
 286         nfs4_init_opendata_res(p);
 287         kref_init(&p->kref);
 288         return p;
 289 err_free:
 290         kfree(p);
 291 err:
 292         dput(parent);
 293         return NULL;
 294 }
 295
 296 static void nfs4_opendata_free(struct kref *kref)
 297 {
 298         struct nfs4_opendata *p = container_of(kref,
 299                         struct nfs4_opendata, kref);
 300
 301         nfs_free_seqid(p->o_arg.seqid);
 302         if (p->state != NULL)
 303                 nfs4_put_open_state(p->state);
 304         nfs4_put_state_owner(p->owner);
 305         dput(p->dir);
 306         dput(p->path.dentry);
 307         mntput(p->path.mnt);
 308         kfree(p);
 309 }
 310
 311 static void nfs4_opendata_put(struct nfs4_opendata *p)
 312 {
 313         if (p != NULL)
 314                 kref_put(&p->kref, nfs4_opendata_free);
 315 }
 316
 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 318 {
 319         int ret;
 320
 321         ret = rpc_wait_for_completion_task(task);
 322         return ret;
 323 }
 324
 325 static int can_open_cached(struct nfs4_state *state, int mode)
 326 {
 327         int ret = 0;
 328         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 329                 case FMODE_READ:
 330                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 331                         break;
 332                 case FMODE_WRITE:
 333                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_READ|FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 337         }
 338         return ret;
 339 }
 340
 341 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 342 {
 343         if ((delegation->type & open_flags) != open_flags)
 344                 return 0;
 345         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 346                 return 0;
 347         return 1;
 348 }
 349
 350 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 351 {
 352         switch (open_flags) {
 353                 case FMODE_WRITE:
 354                         state->n_wronly++;
 355                         break;
 356                 case FMODE_READ:
 357                         state->n_rdonly++;
 358                         break;
 359                 case FMODE_READ|FMODE_WRITE:
 360                         state->n_rdwr++;
 361         }
 362         nfs4_state_set_mode_locked(state, state->state | open_flags);
 363 }
 364
 365 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 366 {
 367         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 368                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 369         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 370         switch (open_flags) {
 371                 case FMODE_READ:
 372                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 373                         break;
 374                 case FMODE_WRITE:
 375                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_READ|FMODE_WRITE:
 378                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 379         }
 380 }
 381
 382 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 383 {
 384         write_seqlock(&state->seqlock);
 385         nfs_set_open_stateid_locked(state, stateid, open_flags);
 386         write_sequnlock(&state->seqlock);
 387 }
 388
 389 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 390 {
 391         open_flags &= (FMODE_READ|FMODE_WRITE);
 392         /*
 393          * Protect the call to nfs4_state_set_mode_locked and
 394          * serialise the stateid update
 395          */
 396         write_seqlock(&state->seqlock);
 397         if (deleg_stateid != NULL) {
 398                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 399                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 400         }
 401         if (open_stateid != NULL)
 402                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 403         write_sequnlock(&state->seqlock);
 404         spin_lock(&state->owner->so_lock);
 405         update_open_stateflags(state, open_flags);
 406         spin_unlock(&state->owner->so_lock);
 407 }
 408
 409 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 410 {
 411         struct nfs_delegation *delegation;
 412
 413         rcu_read_lock();
 414         delegation = rcu_dereference(NFS_I(inode)->delegation);
 415         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 416                 rcu_read_unlock();
 417                 return;
 418         }
 419         rcu_read_unlock();
 420         nfs_inode_return_delegation(inode);
 421 }
 422
 423 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 424 {
 425         struct nfs4_state *state = opendata->state;
 426         struct nfs_inode *nfsi = NFS_I(state->inode);
 427         struct nfs_delegation *delegation;
 428         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 429         nfs4_stateid stateid;
 430         int ret = -EAGAIN;
 431
 432         rcu_read_lock();
 433         delegation = rcu_dereference(nfsi->delegation);
 434         for (;;) {
 435                 if (can_open_cached(state, open_mode)) {
 436                         spin_lock(&state->owner->so_lock);
 437                         if (can_open_cached(state, open_mode)) {
 438                                 update_open_stateflags(state, open_mode);
 439                                 spin_unlock(&state->owner->so_lock);
 440                                 rcu_read_unlock();
 441                                 goto out_return_state;
 442                         }
 443                         spin_unlock(&state->owner->so_lock);
 444                 }
 445                 if (delegation == NULL)
 446                         break;
 447                 if (!can_open_delegated(delegation, open_mode))
 448                         break;
 449                 /* Save the delegation */
 450                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 451                 rcu_read_unlock();
 452                 lock_kernel();
 453                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 454                 unlock_kernel();
 455                 if (ret != 0)
 456                         goto out;
 457                 ret = -EAGAIN;
 458                 rcu_read_lock();
 459                 delegation = rcu_dereference(nfsi->delegation);
 460                 /* If no delegation, try a cached open */
 461                 if (delegation == NULL)
 462                         continue;
 463                 /* Is the delegation still valid? */
 464                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 465                         continue;
 466                 rcu_read_unlock();
 467                 update_open_stateid(state, NULL, &stateid, open_mode);
 468                 goto out_return_state;
 469         }
 470         rcu_read_unlock();
 471 out:
 472         return ERR_PTR(ret);
 473 out_return_state:
 474         atomic_inc(&state->count);
 475         return state;
 476 }
 477
 478 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 479 {
 480         struct inode *inode;
 481         struct nfs4_state *state = NULL;
 482         struct nfs_delegation *delegation;
 483         nfs4_stateid *deleg_stateid = NULL;
 484         int ret;
 485
 486         if (!data->rpc_done) {
 487                 state = nfs4_try_open_cached(data);
 488                 goto out;
 489         }
 490
 491         ret = -EAGAIN;
 492         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 493                 goto err;
 494         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 495         ret = PTR_ERR(inode);
 496         if (IS_ERR(inode))
 497                 goto err;
 498         ret = -ENOMEM;
 499         state = nfs4_get_open_state(inode, data->owner);
 500         if (state == NULL)
 501                 goto err_put_inode;
 502         if (data->o_res.delegation_type != 0) {
 503                 int delegation_flags = 0;
 504
 505                 rcu_read_lock();
 506                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 507                 if (delegation)
 508                         delegation_flags = delegation->flags;
 509                 rcu_read_unlock();
 510                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 511                         nfs_inode_set_delegation(state->inode,
 512                                         data->owner->so_cred,
 513                                         &data->o_res);
 514                 else
 515                         nfs_inode_reclaim_delegation(state->inode,
 516                                         data->owner->so_cred,
 517                                         &data->o_res);
 518         }
 519         rcu_read_lock();
 520         delegation = rcu_dereference(NFS_I(inode)->delegation);
 521         if (delegation != NULL)
 522                 deleg_stateid = &delegation->stateid;
 523         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 524         rcu_read_unlock();
 525         iput(inode);
 526 out:
 527         return state;
 528 err_put_inode:
 529         iput(inode);
 530 err:
 531         return ERR_PTR(ret);
 532 }
 533
 534 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 535 {
 536         struct nfs_inode *nfsi = NFS_I(state->inode);
 537         struct nfs_open_context *ctx;
 538
 539         spin_lock(&state->inode->i_lock);
 540         list_for_each_entry(ctx, &nfsi->open_files, list) {
 541                 if (ctx->state != state)
 542                         continue;
 543                 get_nfs_open_context(ctx);
 544                 spin_unlock(&state->inode->i_lock);
 545                 return ctx;
 546         }
 547         spin_unlock(&state->inode->i_lock);
 548         return ERR_PTR(-ENOENT);
 549 }
 550
 551 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 552 {
 553         struct nfs4_opendata *opendata;
 554
 555         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 556         if (opendata == NULL)
 557                 return ERR_PTR(-ENOMEM);
 558         opendata->state = state;
 559         atomic_inc(&state->count);
 560         return opendata;
 561 }
 562
 563 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 564 {
 565         struct nfs4_state *newstate;
 566         int ret;
 567
 568         opendata->o_arg.open_flags = openflags;
 569         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 570         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 571         nfs4_init_opendata_res(opendata);
 572         ret = _nfs4_proc_open(opendata);
 573         if (ret != 0)
 574                 return ret;
 575         newstate = nfs4_opendata_to_nfs4_state(opendata);
 576         if (IS_ERR(newstate))
 577                 return PTR_ERR(newstate);
 578         nfs4_close_state(&opendata->path, newstate, openflags);
 579         *res = newstate;
 580         return 0;
 581 }
 582
 583 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 584 {
 585         struct nfs4_state *newstate;
 586         int ret;
 587
 588         /* memory barrier prior to reading state->n_* */
 589         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 590         smp_rmb();
 591         if (state->n_rdwr != 0) {
 592                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 593                 if (ret != 0)
 594                         return ret;
 595                 if (newstate != state)
 596                         return -ESTALE;
 597         }
 598         if (state->n_wronly != 0) {
 599                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 600                 if (ret != 0)
 601                         return ret;
 602                 if (newstate != state)
 603                         return -ESTALE;
 604         }
 605         if (state->n_rdonly != 0) {
 606                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 607                 if (ret != 0)
 608                         return ret;
 609                 if (newstate != state)
 610                         return -ESTALE;
 611         }
 612         /*
 613          * We may have performed cached opens for all three recoveries.
 614          * Check if we need to update the current stateid.
 615          */
 616         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 617             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 618                 write_seqlock(&state->seqlock);
 619                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 620                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 621                 write_sequnlock(&state->seqlock);
 622         }
 623         return 0;
 624 }
 625
 626 /*
 627  * OPEN_RECLAIM:
 628  *      reclaim state on the server after a reboot.
 629  */
 630 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 631 {
 632         struct nfs_delegation *delegation;
 633         struct nfs4_opendata *opendata;
 634         int delegation_type = 0;
 635         int status;
 636
 637         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 638         if (IS_ERR(opendata))
 639                 return PTR_ERR(opendata);
 640         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 641         opendata->o_arg.fh = NFS_FH(state->inode);
 642         rcu_read_lock();
 643         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 644         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 645                 delegation_type = delegation->type;
 646         rcu_read_unlock();
 647         opendata->o_arg.u.delegation_type = delegation_type;
 648         status = nfs4_open_recover(opendata, state);
 649         nfs4_opendata_put(opendata);
 650         return status;
 651 }
 652
 653 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 654 {
 655         struct nfs_server *server = NFS_SERVER(state->inode);
 656         struct nfs4_exception exception = { };
 657         int err;
 658         do {
 659                 err = _nfs4_do_open_reclaim(ctx, state);
 660                 if (err != -NFS4ERR_DELAY)
 661                         break;
 662                 nfs4_handle_exception(server, err, &exception);
 663         } while (exception.retry);
 664         return err;
 665 }
 666
 667 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 668 {
 669         struct nfs_open_context *ctx;
 670         int ret;
 671
 672         ctx = nfs4_state_find_open_context(state);
 673         if (IS_ERR(ctx))
 674                 return PTR_ERR(ctx);
 675         ret = nfs4_do_open_reclaim(ctx, state);
 676         put_nfs_open_context(ctx);
 677         return ret;
 678 }
 679
 680 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 681 {
 682         struct nfs4_opendata *opendata;
 683         int ret;
 684
 685         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 686         if (IS_ERR(opendata))
 687                 return PTR_ERR(opendata);
 688         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 689         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 690                         sizeof(opendata->o_arg.u.delegation.data));
 691         ret = nfs4_open_recover(opendata, state);
 692         nfs4_opendata_put(opendata);
 693         return ret;
 694 }
 695
 696 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 697 {
 698         struct nfs4_exception exception = { };
 699         struct nfs_server *server = NFS_SERVER(state->inode);
 700         int err;
 701         do {
 702                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 703                 switch (err) {
 704                         case 0:
 705                                 return err;
 706                         case -NFS4ERR_STALE_CLIENTID:
 707                         case -NFS4ERR_STALE_STATEID:
 708                         case -NFS4ERR_EXPIRED:
 709                                 /* Don't recall a delegation if it was lost */
 710                                 nfs4_schedule_state_recovery(server->nfs_client);
 711                                 return err;
 712                 }
 713                 err = nfs4_handle_exception(server, err, &exception);
 714         } while (exception.retry);
 715         return err;
 716 }
 717
 718 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 719 {
 720         struct nfs4_opendata *data = calldata;
 721         struct  rpc_message msg = {
 722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 723                 .rpc_argp = &data->c_arg,
 724                 .rpc_resp = &data->c_res,
 725                 .rpc_cred = data->owner->so_cred,
 726         };
 727         data->timestamp = jiffies;
 728         rpc_call_setup(task, &msg, 0);
 729 }
 730
 731 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 732 {
 733         struct nfs4_opendata *data = calldata;
 734
 735         data->rpc_status = task->tk_status;
 736         if (RPC_ASSASSINATED(task))
 737                 return;
 738         if (data->rpc_status == 0) {
 739                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 740                                 sizeof(data->o_res.stateid.data));
 741                 renew_lease(data->o_res.server, data->timestamp);
 742                 data->rpc_done = 1;
 743         }
 744         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 745         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 746 }
 747
 748 static void nfs4_open_confirm_release(void *calldata)
 749 {
 750         struct nfs4_opendata *data = calldata;
 751         struct nfs4_state *state = NULL;
 752
 753         /* If this request hasn't been cancelled, do nothing */
 754         if (data->cancelled == 0)
 755                 goto out_free;
 756         /* In case of error, no cleanup! */
 757         if (!data->rpc_done)
 758                 goto out_free;
 759         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 760         state = nfs4_opendata_to_nfs4_state(data);
 761         if (!IS_ERR(state))
 762                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 763 out_free:
 764         nfs4_opendata_put(data);
 765 }
 766
 767 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 768         .rpc_call_prepare = nfs4_open_confirm_prepare,
 769         .rpc_call_done = nfs4_open_confirm_done,
 770         .rpc_release = nfs4_open_confirm_release,
 771 };
 772
 773 /*
 774  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 775  */
 776 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 777 {
 778         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 779         struct rpc_task *task;
 780         int status;
 781
 782         kref_get(&data->kref);
 783         data->rpc_done = 0;
 784         data->rpc_status = 0;
 785         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 786         if (IS_ERR(task))
 787                 return PTR_ERR(task);
 788         status = nfs4_wait_for_completion_rpc_task(task);
 789         if (status != 0) {
 790                 data->cancelled = 1;
 791                 smp_wmb();
 792         } else
 793                 status = data->rpc_status;
 794         rpc_put_task(task);
 795         return status;
 796 }
 797
 798 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 799 {
 800         struct nfs4_opendata *data = calldata;
 801         struct nfs4_state_owner *sp = data->owner;
 802         struct rpc_message msg = {
 803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 804                 .rpc_argp = &data->o_arg,
 805                 .rpc_resp = &data->o_res,
 806                 .rpc_cred = sp->so_cred,
 807         };
 808
 809         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 810                 return;
 811         /*
 812          * Check if we still need to send an OPEN call, or if we can use
 813          * a delegation instead.
 814          */
 815         if (data->state != NULL) {
 816                 struct nfs_delegation *delegation;
 817
 818                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 819                         goto out_no_action;
 820                 rcu_read_lock();
 821                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 822                 if (delegation != NULL &&
 823                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 824                         rcu_read_unlock();
 825                         goto out_no_action;
 826                 }
 827                 rcu_read_unlock();
 828         }
 829         /* Update sequence id. */
 830         data->o_arg.id = sp->so_owner_id.id;
 831         data->o_arg.clientid = sp->so_client->cl_clientid;
 832         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 833                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 834                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 835         }
 836         data->timestamp = jiffies;
 837         rpc_call_setup(task, &msg, 0);
 838         return;
 839 out_no_action:
 840         task->tk_action = NULL;
 841
 842 }
 843
 844 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 845 {
 846         struct nfs4_opendata *data = calldata;
 847
 848         data->rpc_status = task->tk_status;
 849         if (RPC_ASSASSINATED(task))
 850                 return;
 851         if (task->tk_status == 0) {
 852                 switch (data->o_res.f_attr->mode & S_IFMT) {
 853                         case S_IFREG:
 854                                 break;
 855                         case S_IFLNK:
 856                                 data->rpc_status = -ELOOP;
 857                                 break;
 858                         case S_IFDIR:
 859                                 data->rpc_status = -EISDIR;
 860                                 break;
 861                         default:
 862                                 data->rpc_status = -ENOTDIR;
 863                 }
 864                 renew_lease(data->o_res.server, data->timestamp);
 865                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 866                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 867         }
 868         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 869         data->rpc_done = 1;
 870 }
 871
 872 static void nfs4_open_release(void *calldata)
 873 {
 874         struct nfs4_opendata *data = calldata;
 875         struct nfs4_state *state = NULL;
 876
 877         /* If this request hasn't been cancelled, do nothing */
 878         if (data->cancelled == 0)
 879                 goto out_free;
 880         /* In case of error, no cleanup! */
 881         if (data->rpc_status != 0 || !data->rpc_done)
 882                 goto out_free;
 883         /* In case we need an open_confirm, no cleanup! */
 884         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 885                 goto out_free;
 886         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 887         state = nfs4_opendata_to_nfs4_state(data);
 888         if (!IS_ERR(state))
 889                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 890 out_free:
 891         nfs4_opendata_put(data);
 892 }
 893
 894 static const struct rpc_call_ops nfs4_open_ops = {
 895         .rpc_call_prepare = nfs4_open_prepare,
 896         .rpc_call_done = nfs4_open_done,
 897         .rpc_release = nfs4_open_release,
 898 };
 899
 900 /*
 901  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 902  */
 903 static int _nfs4_proc_open(struct nfs4_opendata *data)
 904 {
 905         struct inode *dir = data->dir->d_inode;
 906         struct nfs_server *server = NFS_SERVER(dir);
 907         struct nfs_openargs *o_arg = &data->o_arg;
 908         struct nfs_openres *o_res = &data->o_res;
 909         struct rpc_task *task;
 910         int status;
 911
 912         kref_get(&data->kref);
 913         data->rpc_done = 0;
 914         data->rpc_status = 0;
 915         data->cancelled = 0;
 916         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 917         if (IS_ERR(task))
 918                 return PTR_ERR(task);
 919         status = nfs4_wait_for_completion_rpc_task(task);
 920         if (status != 0) {
 921                 data->cancelled = 1;
 922                 smp_wmb();
 923         } else
 924                 status = data->rpc_status;
 925         rpc_put_task(task);
 926         if (status != 0 || !data->rpc_done)
 927                 return status;
 928
 929         if (o_res->fh.size == 0)
 930                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 931
 932         if (o_arg->open_flags & O_CREAT) {
 933                 update_changeattr(dir, &o_res->cinfo);
 934                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 935         } else
 936                 nfs_refresh_inode(dir, o_res->dir_attr);
 937         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 938                 status = _nfs4_proc_open_confirm(data);
 939                 if (status != 0)
 940                         return status;
 941         }
 942         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 943                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 944         return 0;
 945 }
 946
 947 static int nfs4_recover_expired_lease(struct nfs_server *server)
 948 {
 949         struct nfs_client *clp = server->nfs_client;
 950         int ret;
 951
 952         for (;;) {
 953                 ret = nfs4_wait_clnt_recover(server->client, clp);
 954                 if (ret != 0)
 955                         return ret;
 956                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 957                         break;
 958                 nfs4_schedule_state_recovery(clp);
 959         }
 960         return 0;
 961 }
 962
 963 /*
 964  * OPEN_EXPIRED:
 965  *      reclaim state on the server after a network partition.
 966  *      Assumes caller holds the appropriate lock
 967  */
 968 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 969 {
 970         struct nfs4_opendata *opendata;
 971         int ret;
 972
 973         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 974         if (IS_ERR(opendata))
 975                 return PTR_ERR(opendata);
 976         ret = nfs4_open_recover(opendata, state);
 977         if (ret == -ESTALE) {
 978                 /* Invalidate the state owner so we don't ever use it again */
 979                 nfs4_drop_state_owner(state->owner);
 980                 d_drop(ctx->path.dentry);
 981         }
 982         nfs4_opendata_put(opendata);
 983         return ret;
 984 }
 985
 986 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 987 {
 988         struct nfs_server *server = NFS_SERVER(state->inode);
 989         struct nfs4_exception exception = { };
 990         int err;
 991
 992         do {
 993                 err = _nfs4_open_expired(ctx, state);
 994                 if (err == -NFS4ERR_DELAY)
 995                         nfs4_handle_exception(server, err, &exception);
 996         } while (exception.retry);
 997         return err;
 998 }
 999
1000 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1001 {
1002         struct nfs_open_context *ctx;
1003         int ret;
1004
1005         ctx = nfs4_state_find_open_context(state);
1006         if (IS_ERR(ctx))
1007                 return PTR_ERR(ctx);
1008         ret = nfs4_do_open_expired(ctx, state);
1009         put_nfs_open_context(ctx);
1010         return ret;
1011 }
1012
1013 /*
1014  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1015  * fields corresponding to attributes that were used to store the verifier.
1016  * Make sure we clobber those fields in the later setattr call
1017  */
1018 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1019 {
1020         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1021             !(sattr->ia_valid & ATTR_ATIME_SET))
1022                 sattr->ia_valid |= ATTR_ATIME;
1023
1024         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1025             !(sattr->ia_valid & ATTR_MTIME_SET))
1026                 sattr->ia_valid |= ATTR_MTIME;
1027 }
1028
1029 /*
1030  * Returns a referenced nfs4_state
1031  */
1032 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1033 {
1034         struct nfs4_state_owner  *sp;
1035         struct nfs4_state     *state = NULL;
1036         struct nfs_server       *server = NFS_SERVER(dir);
1037         struct nfs_client *clp = server->nfs_client;
1038         struct nfs4_opendata *opendata;
1039         int status;
1040
1041         /* Protect against reboot recovery conflicts */
1042         status = -ENOMEM;
1043         if (!(sp = nfs4_get_state_owner(server, cred))) {
1044                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1045                 goto out_err;
1046         }
1047         status = nfs4_recover_expired_lease(server);
1048         if (status != 0)
1049                 goto err_put_state_owner;
1050         if (path->dentry->d_inode != NULL)
1051                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1052         down_read(&clp->cl_sem);
1053         status = -ENOMEM;
1054         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1055         if (opendata == NULL)
1056                 goto err_release_rwsem;
1057
1058         if (path->dentry->d_inode != NULL)
1059                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1060
1061         status = _nfs4_proc_open(opendata);
1062         if (status != 0)
1063                 goto err_opendata_put;
1064
1065         if (opendata->o_arg.open_flags & O_EXCL)
1066                 nfs4_exclusive_attrset(opendata, sattr);
1067
1068         state = nfs4_opendata_to_nfs4_state(opendata);
1069         status = PTR_ERR(state);
1070         if (IS_ERR(state))
1071                 goto err_opendata_put;
1072         nfs4_opendata_put(opendata);
1073         nfs4_put_state_owner(sp);
1074         up_read(&clp->cl_sem);
1075         *res = state;
1076         return 0;
1077 err_opendata_put:
1078         nfs4_opendata_put(opendata);
1079 err_release_rwsem:
1080         up_read(&clp->cl_sem);
1081 err_put_state_owner:
1082         nfs4_put_state_owner(sp);
1083 out_err:
1084         *res = NULL;
1085         return status;
1086 }
1087
1088
1089 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1090 {
1091         struct nfs4_exception exception = { };
1092         struct nfs4_state *res;
1093         int status;
1094
1095         do {
1096                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1097                 if (status == 0)
1098                         break;
1099                 /* NOTE: BAD_SEQID means the server and client disagree about the
1100                  * book-keeping w.r.t. state-changing operations
1101                  * (OPEN/CLOSE/LOCK/LOCKU...)
1102                  * It is actually a sign of a bug on the client or on the server.
1103                  *
1104                  * If we receive a BAD_SEQID error in the particular case of
1105                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1106                  * have unhashed the old state_owner for us, and that we can
1107                  * therefore safely retry using a new one. We should still warn
1108                  * the user though...
1109                  */
1110                 if (status == -NFS4ERR_BAD_SEQID) {
1111                         printk(KERN_WARNING "NFS: v4 server %s "
1112                                         " returned a bad sequence-id error!\n",
1113                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1114                         exception.retry = 1;
1115                         continue;
1116                 }
1117                 /*
1118                  * BAD_STATEID on OPEN means that the server cancelled our
1119                  * state before it received the OPEN_CONFIRM.
1120                  * Recover by retrying the request as per the discussion
1121                  * on Page 181 of RFC3530.
1122                  */
1123                 if (status == -NFS4ERR_BAD_STATEID) {
1124                         exception.retry = 1;
1125                         continue;
1126                 }
1127                 if (status == -EAGAIN) {
1128                         /* We must have found a delegation */
1129                         exception.retry = 1;
1130                         continue;
1131                 }
1132                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1133                                         status, &exception));
1134         } while (exception.retry);
1135         return res;
1136 }
1137
1138 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1139                 struct iattr *sattr, struct nfs4_state *state)
1140 {
1141         struct nfs_server *server = NFS_SERVER(inode);
1142         struct nfs_setattrargs  arg = {
1143                 .fh             = NFS_FH(inode),
1144                 .iap            = sattr,
1145                 .server         = server,
1146                 .bitmask = server->attr_bitmask,
1147         };
1148         struct nfs_setattrres  res = {
1149                 .fattr          = fattr,
1150                 .server         = server,
1151         };
1152         struct rpc_message msg = {
1153                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1154                 .rpc_argp       = &arg,
1155                 .rpc_resp       = &res,
1156         };
1157         unsigned long timestamp = jiffies;
1158         int status;
1159
1160         nfs_fattr_init(fattr);
1161
1162         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1163                 /* Use that stateid */
1164         } else if (state != NULL) {
1165                 msg.rpc_cred = state->owner->so_cred;
1166                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1167         } else
1168                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1169
1170         status = rpc_call_sync(server->client, &msg, 0);
1171         if (status == 0 && state != NULL)
1172                 renew_lease(server, timestamp);
1173         return status;
1174 }
1175
1176 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1177                 struct iattr *sattr, struct nfs4_state *state)
1178 {
1179         struct nfs_server *server = NFS_SERVER(inode);
1180         struct nfs4_exception exception = { };
1181         int err;
1182         do {
1183                 err = nfs4_handle_exception(server,
1184                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1185                                 &exception);
1186         } while (exception.retry);
1187         return err;
1188 }
1189
1190 struct nfs4_closedata {
1191         struct path path;
1192         struct inode *inode;
1193         struct nfs4_state *state;
1194         struct nfs_closeargs arg;
1195         struct nfs_closeres res;
1196         struct nfs_fattr fattr;
1197         unsigned long timestamp;
1198 };
1199
1200 static void nfs4_free_closedata(void *data)
1201 {
1202         struct nfs4_closedata *calldata = data;
1203         struct nfs4_state_owner *sp = calldata->state->owner;
1204
1205         nfs4_put_open_state(calldata->state);
1206         nfs_free_seqid(calldata->arg.seqid);
1207         nfs4_put_state_owner(sp);
1208         dput(calldata->path.dentry);
1209         mntput(calldata->path.mnt);
1210         kfree(calldata);
1211 }
1212
1213 static void nfs4_close_done(struct rpc_task *task, void *data)
1214 {
1215         struct nfs4_closedata *calldata = data;
1216         struct nfs4_state *state = calldata->state;
1217         struct nfs_server *server = NFS_SERVER(calldata->inode);
1218
1219         if (RPC_ASSASSINATED(task))
1220                 return;
1221         /* hmm. we are done with the inode, and in the process of freeing
1222          * the state_owner. we keep this around to process errors
1223          */
1224         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1225         switch (task->tk_status) {
1226                 case 0:
1227                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1228                         renew_lease(server, calldata->timestamp);
1229                         break;
1230                 case -NFS4ERR_STALE_STATEID:
1231                 case -NFS4ERR_EXPIRED:
1232                         break;
1233                 default:
1234                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1235                                 rpc_restart_call(task);
1236                                 return;
1237                         }
1238         }
1239         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1240 }
1241
1242 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1243 {
1244         struct nfs4_closedata *calldata = data;
1245         struct nfs4_state *state = calldata->state;
1246         struct rpc_message msg = {
1247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1248                 .rpc_argp = &calldata->arg,
1249                 .rpc_resp = &calldata->res,
1250                 .rpc_cred = state->owner->so_cred,
1251         };
1252         int clear_rd, clear_wr, clear_rdwr;
1253
1254         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1255                 return;
1256
1257         clear_rd = clear_wr = clear_rdwr = 0;
1258         spin_lock(&state->owner->so_lock);
1259         /* Calculate the change in open mode */
1260         if (state->n_rdwr == 0) {
1261                 if (state->n_rdonly == 0) {
1262                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1263                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1264                 }
1265                 if (state->n_wronly == 0) {
1266                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1267                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1268                 }
1269         }
1270         spin_unlock(&state->owner->so_lock);
1271         if (!clear_rd && !clear_wr && !clear_rdwr) {
1272                 /* Note: exit _without_ calling nfs4_close_done */
1273                 task->tk_action = NULL;
1274                 return;
1275         }
1276         nfs_fattr_init(calldata->res.fattr);
1277         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1278                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1279                 calldata->arg.open_flags = FMODE_READ;
1280         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1281                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1282                 calldata->arg.open_flags = FMODE_WRITE;
1283         }
1284         calldata->timestamp = jiffies;
1285         rpc_call_setup(task, &msg, 0);
1286 }
1287
1288 static const struct rpc_call_ops nfs4_close_ops = {
1289         .rpc_call_prepare = nfs4_close_prepare,
1290         .rpc_call_done = nfs4_close_done,
1291         .rpc_release = nfs4_free_closedata,
1292 };
1293
1294 /*
1295  * It is possible for data to be read/written from a mem-mapped file
1296  * after the sys_close call (which hits the vfs layer as a flush).
1297  * This means that we can't safely call nfsv4 close on a file until
1298  * the inode is cleared. This in turn means that we are not good
1299  * NFSv4 citizens - we do not indicate to the server to update the file's
1300  * share state even when we are done with one of the three share
1301  * stateid's in the inode.
1302  *
1303  * NOTE: Caller must be holding the sp->so_owner semaphore!
1304  */
1305 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1306 {
1307         struct nfs_server *server = NFS_SERVER(state->inode);
1308         struct nfs4_closedata *calldata;
1309         struct nfs4_state_owner *sp = state->owner;
1310         struct rpc_task *task;
1311         int status = -ENOMEM;
1312
1313         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1314         if (calldata == NULL)
1315                 goto out;
1316         calldata->inode = state->inode;
1317         calldata->state = state;
1318         calldata->arg.fh = NFS_FH(state->inode);
1319         calldata->arg.stateid = &state->open_stateid;
1320         /* Serialization for the sequence id */
1321         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1322         if (calldata->arg.seqid == NULL)
1323                 goto out_free_calldata;
1324         calldata->arg.bitmask = server->attr_bitmask;
1325         calldata->res.fattr = &calldata->fattr;
1326         calldata->res.server = server;
1327         calldata->path.mnt = mntget(path->mnt);
1328         calldata->path.dentry = dget(path->dentry);
1329
1330         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1331         if (IS_ERR(task))
1332                 return PTR_ERR(task);
1333         status = 0;
1334         if (wait)
1335                 status = rpc_wait_for_completion_task(task);
1336         rpc_put_task(task);
1337         return status;
1338 out_free_calldata:
1339         kfree(calldata);
1340 out:
1341         nfs4_put_open_state(state);
1342         nfs4_put_state_owner(sp);
1343         return status;
1344 }
1345
1346 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1347 {
1348         struct file *filp;
1349         int ret;
1350
1351         /* If the open_intent is for execute, we have an extra check to make */
1352         if (nd->intent.open.flags & FMODE_EXEC) {
1353                 ret = nfs_may_open(state->inode,
1354                                 state->owner->so_cred,
1355                                 nd->intent.open.flags);
1356                 if (ret < 0)
1357                         goto out_close;
1358         }
1359         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1360         if (!IS_ERR(filp)) {
1361                 struct nfs_open_context *ctx;
1362                 ctx = nfs_file_open_context(filp);
1363                 ctx->state = state;
1364                 return 0;
1365         }
1366         ret = PTR_ERR(filp);
1367 out_close:
1368         nfs4_close_sync(path, state, nd->intent.open.flags);
1369         return ret;
1370 }
1371
1372 struct dentry *
1373 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1374 {
1375         struct dentry *parent;
1376         struct path path = {
1377                 .mnt = nd->mnt,
1378                 .dentry = dentry,
1379         };
1380         struct iattr attr;
1381         struct rpc_cred *cred;
1382         struct nfs4_state *state;
1383         struct dentry *res;
1384
1385         if (nd->flags & LOOKUP_CREATE) {
1386                 attr.ia_mode = nd->intent.open.create_mode;
1387                 attr.ia_valid = ATTR_MODE;
1388                 if (!IS_POSIXACL(dir))
1389                         attr.ia_mode &= ~current->fs->umask;
1390         } else {
1391                 attr.ia_valid = 0;
1392                 BUG_ON(nd->intent.open.flags & O_CREAT);
1393         }
1394
1395         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1396         if (IS_ERR(cred))
1397                 return (struct dentry *)cred;
1398         parent = dentry->d_parent;
1399         /* Protect against concurrent sillydeletes */
1400         nfs_block_sillyrename(parent);
1401         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1402         put_rpccred(cred);
1403         if (IS_ERR(state)) {
1404                 if (PTR_ERR(state) == -ENOENT) {
1405                         d_add(dentry, NULL);
1406                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1407                 }
1408                 nfs_unblock_sillyrename(parent);
1409                 return (struct dentry *)state;
1410         }
1411         res = d_add_unique(dentry, igrab(state->inode));
1412         if (res != NULL)
1413                 path.dentry = res;
1414         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1415         nfs_unblock_sillyrename(parent);
1416         nfs4_intent_set_file(nd, &path, state);
1417         return res;
1418 }
1419
1420 int
1421 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1422 {
1423         struct path path = {
1424                 .mnt = nd->mnt,
1425                 .dentry = dentry,
1426         };
1427         struct rpc_cred *cred;
1428         struct nfs4_state *state;
1429
1430         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1431         if (IS_ERR(cred))
1432                 return PTR_ERR(cred);
1433         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1434         put_rpccred(cred);
1435         if (IS_ERR(state)) {
1436                 switch (PTR_ERR(state)) {
1437                         case -EPERM:
1438                         case -EACCES:
1439                         case -EDQUOT:
1440                         case -ENOSPC:
1441                         case -EROFS:
1442                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1443                                 return 1;
1444                         default:
1445                                 goto out_drop;
1446                 }
1447         }
1448         if (state->inode == dentry->d_inode) {
1449                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1450                 nfs4_intent_set_file(nd, &path, state);
1451                 return 1;
1452         }
1453         nfs4_close_sync(&path, state, openflags);
1454 out_drop:
1455         d_drop(dentry);
1456         return 0;
1457 }
1458
1459
1460 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1461 {
1462         struct nfs4_server_caps_res res = {};
1463         struct rpc_message msg = {
1464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1465                 .rpc_argp = fhandle,
1466                 .rpc_resp = &res,
1467         };
1468         int status;
1469
1470         status = rpc_call_sync(server->client, &msg, 0);
1471         if (status == 0) {
1472                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1473                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1474                         server->caps |= NFS_CAP_ACLS;
1475                 if (res.has_links != 0)
1476                         server->caps |= NFS_CAP_HARDLINKS;
1477                 if (res.has_symlinks != 0)
1478                         server->caps |= NFS_CAP_SYMLINKS;
1479                 server->acl_bitmask = res.acl_bitmask;
1480         }
1481         return status;
1482 }
1483
1484 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1485 {
1486         struct nfs4_exception exception = { };
1487         int err;
1488         do {
1489                 err = nfs4_handle_exception(server,
1490                                 _nfs4_server_capabilities(server, fhandle),
1491                                 &exception);
1492         } while (exception.retry);
1493         return err;
1494 }
1495
1496 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1497                 struct nfs_fsinfo *info)
1498 {
1499         struct nfs4_lookup_root_arg args = {
1500                 .bitmask = nfs4_fattr_bitmap,
1501         };
1502         struct nfs4_lookup_res res = {
1503                 .server = server,
1504                 .fattr = info->fattr,
1505                 .fh = fhandle,
1506         };
1507         struct rpc_message msg = {
1508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1509                 .rpc_argp = &args,
1510                 .rpc_resp = &res,
1511         };
1512         nfs_fattr_init(info->fattr);
1513         return rpc_call_sync(server->client, &msg, 0);
1514 }
1515
1516 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1517                 struct nfs_fsinfo *info)
1518 {
1519         struct nfs4_exception exception = { };
1520         int err;
1521         do {
1522                 err = nfs4_handle_exception(server,
1523                                 _nfs4_lookup_root(server, fhandle, info),
1524                                 &exception);
1525         } while (exception.retry);
1526         return err;
1527 }
1528
1529 /*
1530  * get the file handle for the "/" directory on the server
1531  */
1532 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1533                               struct nfs_fsinfo *info)
1534 {
1535         int status;
1536
1537         status = nfs4_lookup_root(server, fhandle, info);
1538         if (status == 0)
1539                 status = nfs4_server_capabilities(server, fhandle);
1540         if (status == 0)
1541                 status = nfs4_do_fsinfo(server, fhandle, info);
1542         return nfs4_map_errors(status);
1543 }
1544
1545 /*
1546  * Get locations and (maybe) other attributes of a referral.
1547  * Note that we'll actually follow the referral later when
1548  * we detect fsid mismatch in inode revalidation
1549  */
1550 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1551 {
1552         int status = -ENOMEM;
1553         struct page *page = NULL;
1554         struct nfs4_fs_locations *locations = NULL;
1555
1556         page = alloc_page(GFP_KERNEL);
1557         if (page == NULL)
1558                 goto out;
1559         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1560         if (locations == NULL)
1561                 goto out;
1562
1563         status = nfs4_proc_fs_locations(dir, name, locations, page);
1564         if (status != 0)
1565                 goto out;
1566         /* Make sure server returned a different fsid for the referral */
1567         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1568                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1569                 status = -EIO;
1570                 goto out;
1571         }
1572
1573         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1574         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1575         if (!fattr->mode)
1576                 fattr->mode = S_IFDIR;
1577         memset(fhandle, 0, sizeof(struct nfs_fh));
1578 out:
1579         if (page)
1580                 __free_page(page);
1581         if (locations)
1582                 kfree(locations);
1583         return status;
1584 }
1585
1586 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1587 {
1588         struct nfs4_getattr_arg args = {
1589                 .fh = fhandle,
1590                 .bitmask = server->attr_bitmask,
1591         };
1592         struct nfs4_getattr_res res = {
1593                 .fattr = fattr,
1594                 .server = server,
1595         };
1596         struct rpc_message msg = {
1597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1598                 .rpc_argp = &args,
1599                 .rpc_resp = &res,
1600         };
1601
1602         nfs_fattr_init(fattr);
1603         return rpc_call_sync(server->client, &msg, 0);
1604 }
1605
1606 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1607 {
1608         struct nfs4_exception exception = { };
1609         int err;
1610         do {
1611                 err = nfs4_handle_exception(server,
1612                                 _nfs4_proc_getattr(server, fhandle, fattr),
1613                                 &exception);
1614         } while (exception.retry);
1615         return err;
1616 }
1617
1618 /*
1619  * The file is not closed if it is opened due to the a request to change
1620  * the size of the file. The open call will not be needed once the
1621  * VFS layer lookup-intents are implemented.
1622  *
1623  * Close is called when the inode is destroyed.
1624  * If we haven't opened the file for O_WRONLY, we
1625  * need to in the size_change case to obtain a stateid.
1626  *
1627  * Got race?
1628  * Because OPEN is always done by name in nfsv4, it is
1629  * possible that we opened a different file by the same
1630  * name.  We can recognize this race condition, but we
1631  * can't do anything about it besides returning an error.
1632  *
1633  * This will be fixed with VFS changes (lookup-intent).
1634  */
1635 static int
1636 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1637                   struct iattr *sattr)
1638 {
1639         struct rpc_cred *cred;
1640         struct inode *inode = dentry->d_inode;
1641         struct nfs_open_context *ctx;
1642         struct nfs4_state *state = NULL;
1643         int status;
1644
1645         nfs_fattr_init(fattr);
1646
1647         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1648         if (IS_ERR(cred))
1649                 return PTR_ERR(cred);
1650
1651         /* Search for an existing open(O_WRITE) file */
1652         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1653         if (ctx != NULL)
1654                 state = ctx->state;
1655
1656         status = nfs4_do_setattr(inode, fattr, sattr, state);
1657         if (status == 0)
1658                 nfs_setattr_update_inode(inode, sattr);
1659         if (ctx != NULL)
1660                 put_nfs_open_context(ctx);
1661         put_rpccred(cred);
1662         return status;
1663 }
1664
1665 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1666                 const struct qstr *name, struct nfs_fh *fhandle,
1667                 struct nfs_fattr *fattr)
1668 {
1669         int                    status;
1670         struct nfs4_lookup_arg args = {
1671                 .bitmask = server->attr_bitmask,
1672                 .dir_fh = dirfh,
1673                 .name = name,
1674         };
1675         struct nfs4_lookup_res res = {
1676                 .server = server,
1677                 .fattr = fattr,
1678                 .fh = fhandle,
1679         };
1680         struct rpc_message msg = {
1681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1682                 .rpc_argp = &args,
1683                 .rpc_resp = &res,
1684         };
1685
1686         nfs_fattr_init(fattr);
1687
1688         dprintk("NFS call  lookupfh %s\n", name->name);
1689         status = rpc_call_sync(server->client, &msg, 0);
1690         dprintk("NFS reply lookupfh: %d\n", status);
1691         return status;
1692 }
1693
1694 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1695                               struct qstr *name, struct nfs_fh *fhandle,
1696                               struct nfs_fattr *fattr)
1697 {
1698         struct nfs4_exception exception = { };
1699         int err;
1700         do {
1701                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1702                 /* FIXME: !!!! */
1703                 if (err == -NFS4ERR_MOVED) {
1704                         err = -EREMOTE;
1705                         break;
1706                 }
1707                 err = nfs4_handle_exception(server, err, &exception);
1708         } while (exception.retry);
1709         return err;
1710 }
1711
1712 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1713                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1714 {
1715         int status;
1716
1717         dprintk("NFS call  lookup %s\n", name->name);
1718         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1719         if (status == -NFS4ERR_MOVED)
1720                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1721         dprintk("NFS reply lookup: %d\n", status);
1722         return status;
1723 }
1724
1725 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1726 {
1727         struct nfs4_exception exception = { };
1728         int err;
1729         do {
1730                 err = nfs4_handle_exception(NFS_SERVER(dir),
1731                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1732                                 &exception);
1733         } while (exception.retry);
1734         return err;
1735 }
1736
1737 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1738 {
1739         struct nfs_server *server = NFS_SERVER(inode);
1740         struct nfs_fattr fattr;
1741         struct nfs4_accessargs args = {
1742                 .fh = NFS_FH(inode),
1743                 .bitmask = server->attr_bitmask,
1744         };
1745         struct nfs4_accessres res = {
1746                 .server = server,
1747                 .fattr = &fattr,
1748         };
1749         struct rpc_message msg = {
1750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1751                 .rpc_argp = &args,
1752                 .rpc_resp = &res,
1753                 .rpc_cred = entry->cred,
1754         };
1755         int mode = entry->mask;
1756         int status;
1757
1758         /*
1759          * Determine which access bits we want to ask for...
1760          */
1761         if (mode & MAY_READ)
1762                 args.access |= NFS4_ACCESS_READ;
1763         if (S_ISDIR(inode->i_mode)) {
1764                 if (mode & MAY_WRITE)
1765                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1766                 if (mode & MAY_EXEC)
1767                         args.access |= NFS4_ACCESS_LOOKUP;
1768         } else {
1769                 if (mode & MAY_WRITE)
1770                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1771                 if (mode & MAY_EXEC)
1772                         args.access |= NFS4_ACCESS_EXECUTE;
1773         }
1774         nfs_fattr_init(&fattr);
1775         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1776         if (!status) {
1777                 entry->mask = 0;
1778                 if (res.access & NFS4_ACCESS_READ)
1779                         entry->mask |= MAY_READ;
1780                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1781                         entry->mask |= MAY_WRITE;
1782                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1783                         entry->mask |= MAY_EXEC;
1784                 nfs_refresh_inode(inode, &fattr);
1785         }
1786         return status;
1787 }
1788
1789 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1790 {
1791         struct nfs4_exception exception = { };
1792         int err;
1793         do {
1794                 err = nfs4_handle_exception(NFS_SERVER(inode),
1795                                 _nfs4_proc_access(inode, entry),
1796                                 &exception);
1797         } while (exception.retry);
1798         return err;
1799 }
1800
1801 /*
1802  * TODO: For the time being, we don't try to get any attributes
1803  * along with any of the zero-copy operations READ, READDIR,
1804  * READLINK, WRITE.
1805  *
1806  * In the case of the first three, we want to put the GETATTR
1807  * after the read-type operation -- this is because it is hard
1808  * to predict the length of a GETATTR response in v4, and thus
1809  * align the READ data correctly.  This means that the GETATTR
1810  * may end up partially falling into the page cache, and we should
1811  * shift it into the 'tail' of the xdr_buf before processing.
1812  * To do this efficiently, we need to know the total length
1813  * of data received, which doesn't seem to be available outside
1814  * of the RPC layer.
1815  *
1816  * In the case of WRITE, we also want to put the GETATTR after
1817  * the operation -- in this case because we want to make sure
1818  * we get the post-operation mtime and size.  This means that
1819  * we can't use xdr_encode_pages() as written: we need a variant
1820  * of it which would leave room in the 'tail' iovec.
1821  *
1822  * Both of these changes to the XDR layer would in fact be quite
1823  * minor, but I decided to leave them for a subsequent patch.
1824  */
1825 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1826                 unsigned int pgbase, unsigned int pglen)
1827 {
1828         struct nfs4_readlink args = {
1829                 .fh       = NFS_FH(inode),
1830                 .pgbase   = pgbase,
1831                 .pglen    = pglen,
1832                 .pages    = &page,
1833         };
1834         struct rpc_message msg = {
1835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1836                 .rpc_argp = &args,
1837                 .rpc_resp = NULL,
1838         };
1839
1840         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1841 }
1842
1843 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1844                 unsigned int pgbase, unsigned int pglen)
1845 {
1846         struct nfs4_exception exception = { };
1847         int err;
1848         do {
1849                 err = nfs4_handle_exception(NFS_SERVER(inode),
1850                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1851                                 &exception);
1852         } while (exception.retry);
1853         return err;
1854 }
1855
1856 /*
1857  * Got race?
1858  * We will need to arrange for the VFS layer to provide an atomic open.
1859  * Until then, this create/open method is prone to inefficiency and race
1860  * conditions due to the lookup, create, and open VFS calls from sys_open()
1861  * placed on the wire.
1862  *
1863  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1864  * The file will be opened again in the subsequent VFS open call
1865  * (nfs4_proc_file_open).
1866  *
1867  * The open for read will just hang around to be used by any process that
1868  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1869  */
1870
1871 static int
1872 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1873                  int flags, struct nameidata *nd)
1874 {
1875         struct path path = {
1876                 .mnt = nd->mnt,
1877                 .dentry = dentry,
1878         };
1879         struct nfs4_state *state;
1880         struct rpc_cred *cred;
1881         int status = 0;
1882
1883         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1884         if (IS_ERR(cred)) {
1885                 status = PTR_ERR(cred);
1886                 goto out;
1887         }
1888         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1889         put_rpccred(cred);
1890         d_drop(dentry);
1891         if (IS_ERR(state)) {
1892                 status = PTR_ERR(state);
1893                 goto out;
1894         }
1895         d_add(dentry, igrab(state->inode));
1896         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1897         if (flags & O_EXCL) {
1898                 struct nfs_fattr fattr;
1899                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1900                 if (status == 0)
1901                         nfs_setattr_update_inode(state->inode, sattr);
1902                 nfs_post_op_update_inode(state->inode, &fattr);
1903         }
1904         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1905                 status = nfs4_intent_set_file(nd, &path, state);
1906         else
1907                 nfs4_close_sync(&path, state, flags);
1908 out:
1909         return status;
1910 }
1911
1912 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1913 {
1914         struct nfs_server *server = NFS_SERVER(dir);
1915         struct nfs_removeargs args = {
1916                 .fh = NFS_FH(dir),
1917                 .name.len = name->len,
1918                 .name.name = name->name,
1919                 .bitmask = server->attr_bitmask,
1920         };
1921         struct nfs_removeres res = {
1922                 .server = server,
1923         };
1924         struct rpc_message msg = {
1925                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1926                 .rpc_argp = &args,
1927                 .rpc_resp = &res,
1928         };
1929         int                     status;
1930
1931         nfs_fattr_init(&res.dir_attr);
1932         status = rpc_call_sync(server->client, &msg, 0);
1933         if (status == 0) {
1934                 update_changeattr(dir, &res.cinfo);
1935                 nfs_post_op_update_inode(dir, &res.dir_attr);
1936         }
1937         return status;
1938 }
1939
1940 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1941 {
1942         struct nfs4_exception exception = { };
1943         int err;
1944         do {
1945                 err = nfs4_handle_exception(NFS_SERVER(dir),
1946                                 _nfs4_proc_remove(dir, name),
1947                                 &exception);
1948         } while (exception.retry);
1949         return err;
1950 }
1951
1952 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1953 {
1954         struct nfs_server *server = NFS_SERVER(dir);
1955         struct nfs_removeargs *args = msg->rpc_argp;
1956         struct nfs_removeres *res = msg->rpc_resp;
1957
1958         args->bitmask = server->attr_bitmask;
1959         res->server = server;
1960         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1961 }
1962
1963 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1964 {
1965         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1966
1967         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1968                 return 0;
1969         update_changeattr(dir, &res->cinfo);
1970         nfs_post_op_update_inode(dir, &res->dir_attr);
1971         return 1;
1972 }
1973
1974 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1975                 struct inode *new_dir, struct qstr *new_name)
1976 {
1977         struct nfs_server *server = NFS_SERVER(old_dir);
1978         struct nfs4_rename_arg arg = {
1979                 .old_dir = NFS_FH(old_dir),
1980                 .new_dir = NFS_FH(new_dir),
1981                 .old_name = old_name,
1982                 .new_name = new_name,
1983                 .bitmask = server->attr_bitmask,
1984         };
1985         struct nfs_fattr old_fattr, new_fattr;
1986         struct nfs4_rename_res res = {
1987                 .server = server,
1988                 .old_fattr = &old_fattr,
1989                 .new_fattr = &new_fattr,
1990         };
1991         struct rpc_message msg = {
1992                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1993                 .rpc_argp = &arg,
1994                 .rpc_resp = &res,
1995         };
1996         int                     status;
1997
1998         nfs_fattr_init(res.old_fattr);
1999         nfs_fattr_init(res.new_fattr);
2000         status = rpc_call_sync(server->client, &msg, 0);
2001
2002         if (!status) {
2003                 update_changeattr(old_dir, &res.old_cinfo);
2004                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2005                 update_changeattr(new_dir, &res.new_cinfo);
2006                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2007         }
2008         return status;
2009 }
2010
2011 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2012                 struct inode *new_dir, struct qstr *new_name)
2013 {
2014         struct nfs4_exception exception = { };
2015         int err;
2016         do {
2017                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2018                                 _nfs4_proc_rename(old_dir, old_name,
2019                                         new_dir, new_name),
2020                                 &exception);
2021         } while (exception.retry);
2022         return err;
2023 }
2024
2025 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2026 {
2027         struct nfs_server *server = NFS_SERVER(inode);
2028         struct nfs4_link_arg arg = {
2029                 .fh     = NFS_FH(inode),
2030                 .dir_fh = NFS_FH(dir),
2031                 .name   = name,
2032                 .bitmask = server->attr_bitmask,
2033         };
2034         struct nfs_fattr fattr, dir_attr;
2035         struct nfs4_link_res res = {
2036                 .server = server,
2037                 .fattr = &fattr,
2038                 .dir_attr = &dir_attr,
2039         };
2040         struct rpc_message msg = {
2041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2042                 .rpc_argp = &arg,
2043                 .rpc_resp = &res,
2044         };
2045         int                     status;
2046
2047         nfs_fattr_init(res.fattr);
2048         nfs_fattr_init(res.dir_attr);
2049         status = rpc_call_sync(server->client, &msg, 0);
2050         if (!status) {
2051                 update_changeattr(dir, &res.cinfo);
2052                 nfs_post_op_update_inode(dir, res.dir_attr);
2053                 nfs_post_op_update_inode(inode, res.fattr);
2054         }
2055
2056         return status;
2057 }
2058
2059 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2060 {
2061         struct nfs4_exception exception = { };
2062         int err;
2063         do {
2064                 err = nfs4_handle_exception(NFS_SERVER(inode),
2065                                 _nfs4_proc_link(inode, dir, name),
2066                                 &exception);
2067         } while (exception.retry);
2068         return err;
2069 }
2070
2071 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2072                 struct page *page, unsigned int len, struct iattr *sattr)
2073 {
2074         struct nfs_server *server = NFS_SERVER(dir);
2075         struct nfs_fh fhandle;
2076         struct nfs_fattr fattr, dir_fattr;
2077         struct nfs4_create_arg arg = {
2078                 .dir_fh = NFS_FH(dir),
2079                 .server = server,
2080                 .name = &dentry->d_name,
2081                 .attrs = sattr,
2082                 .ftype = NF4LNK,
2083                 .bitmask = server->attr_bitmask,
2084         };
2085         struct nfs4_create_res res = {
2086                 .server = server,
2087                 .fh = &fhandle,
2088                 .fattr = &fattr,
2089                 .dir_fattr = &dir_fattr,
2090         };
2091         struct rpc_message msg = {
2092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2093                 .rpc_argp = &arg,
2094                 .rpc_resp = &res,
2095         };
2096         int                     status;
2097
2098         if (len > NFS4_MAXPATHLEN)
2099                 return -ENAMETOOLONG;
2100
2101         arg.u.symlink.pages = &page;
2102         arg.u.symlink.len = len;
2103         nfs_fattr_init(&fattr);
2104         nfs_fattr_init(&dir_fattr);
2105
2106         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2107         if (!status) {
2108                 update_changeattr(dir, &res.dir_cinfo);
2109                 nfs_post_op_update_inode(dir, res.dir_fattr);
2110                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2111         }
2112         return status;
2113 }
2114
2115 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2116                 struct page *page, unsigned int len, struct iattr *sattr)
2117 {
2118         struct nfs4_exception exception = { };
2119         int err;
2120         do {
2121                 err = nfs4_handle_exception(NFS_SERVER(dir),
2122                                 _nfs4_proc_symlink(dir, dentry, page,
2123                                                         len, sattr),
2124                                 &exception);
2125         } while (exception.retry);
2126         return err;
2127 }
2128
2129 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2130                 struct iattr *sattr)
2131 {
2132         struct nfs_server *server = NFS_SERVER(dir);
2133         struct nfs_fh fhandle;
2134         struct nfs_fattr fattr, dir_fattr;
2135         struct nfs4_create_arg arg = {
2136                 .dir_fh = NFS_FH(dir),
2137                 .server = server,
2138                 .name = &dentry->d_name,
2139                 .attrs = sattr,
2140                 .ftype = NF4DIR,
2141                 .bitmask = server->attr_bitmask,
2142         };
2143         struct nfs4_create_res res = {
2144                 .server = server,
2145                 .fh = &fhandle,
2146                 .fattr = &fattr,
2147                 .dir_fattr = &dir_fattr,
2148         };
2149         struct rpc_message msg = {
2150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2151                 .rpc_argp = &arg,
2152                 .rpc_resp = &res,
2153         };
2154         int                     status;
2155
2156         nfs_fattr_init(&fattr);
2157         nfs_fattr_init(&dir_fattr);
2158
2159         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2160         if (!status) {
2161                 update_changeattr(dir, &res.dir_cinfo);
2162                 nfs_post_op_update_inode(dir, res.dir_fattr);
2163                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2164         }
2165         return status;
2166 }
2167
2168 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2169                 struct iattr *sattr)
2170 {
2171         struct nfs4_exception exception = { };
2172         int err;
2173         do {
2174                 err = nfs4_handle_exception(NFS_SERVER(dir),
2175                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2176                                 &exception);
2177         } while (exception.retry);
2178         return err;
2179 }
2180
2181 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2182                   u64 cookie, struct page *page, unsigned int count, int plus)
2183 {
2184         struct inode            *dir = dentry->d_inode;
2185         struct nfs4_readdir_arg args = {
2186                 .fh = NFS_FH(dir),
2187                 .pages = &page,
2188                 .pgbase = 0,
2189                 .count = count,
2190                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2191         };
2192         struct nfs4_readdir_res res;
2193         struct rpc_message msg = {
2194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2195                 .rpc_argp = &args,
2196                 .rpc_resp = &res,
2197                 .rpc_cred = cred,
2198         };
2199         int                     status;
2200
2201         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2202                         dentry->d_parent->d_name.name,
2203                         dentry->d_name.name,
2204                         (unsigned long long)cookie);
2205         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2206         res.pgbase = args.pgbase;
2207         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2208         if (status == 0)
2209                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2210
2211         nfs_invalidate_atime(dir);
2212
2213         dprintk("%s: returns %d\n", __FUNCTION__, status);
2214         return status;
2215 }
2216
2217 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2218                   u64 cookie, struct page *page, unsigned int count, int plus)
2219 {
2220         struct nfs4_exception exception = { };
2221         int err;
2222         do {
2223                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2224                                 _nfs4_proc_readdir(dentry, cred, cookie,
2225                                         page, count, plus),
2226                                 &exception);
2227         } while (exception.retry);
2228         return err;
2229 }
2230
2231 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2232                 struct iattr *sattr, dev_t rdev)
2233 {
2234         struct nfs_server *server = NFS_SERVER(dir);
2235         struct nfs_fh fh;
2236         struct nfs_fattr fattr, dir_fattr;
2237         struct nfs4_create_arg arg = {
2238                 .dir_fh = NFS_FH(dir),
2239                 .server = server,
2240                 .name = &dentry->d_name,
2241                 .attrs = sattr,
2242                 .bitmask = server->attr_bitmask,
2243         };
2244         struct nfs4_create_res res = {
2245                 .server = server,
2246                 .fh = &fh,
2247                 .fattr = &fattr,
2248                 .dir_fattr = &dir_fattr,
2249         };
2250         struct rpc_message msg = {
2251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2252                 .rpc_argp = &arg,
2253                 .rpc_resp = &res,
2254         };
2255         int                     status;
2256         int                     mode = sattr->ia_mode;
2257
2258         nfs_fattr_init(&fattr);
2259         nfs_fattr_init(&dir_fattr);
2260
2261         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2262         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2263         if (S_ISFIFO(mode))
2264                 arg.ftype = NF4FIFO;
2265         else if (S_ISBLK(mode)) {
2266                 arg.ftype = NF4BLK;
2267                 arg.u.device.specdata1 = MAJOR(rdev);
2268                 arg.u.device.specdata2 = MINOR(rdev);
2269         }
2270         else if (S_ISCHR(mode)) {
2271                 arg.ftype = NF4CHR;
2272                 arg.u.device.specdata1 = MAJOR(rdev);
2273                 arg.u.device.specdata2 = MINOR(rdev);
2274         }
2275         else
2276                 arg.ftype = NF4SOCK;
2277
2278         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2279         if (status == 0) {
2280                 update_changeattr(dir, &res.dir_cinfo);
2281                 nfs_post_op_update_inode(dir, res.dir_fattr);
2282                 status = nfs_instantiate(dentry, &fh, &fattr);
2283         }
2284         return status;
2285 }
2286
2287 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2288                 struct iattr *sattr, dev_t rdev)
2289 {
2290         struct nfs4_exception exception = { };
2291         int err;
2292         do {
2293                 err = nfs4_handle_exception(NFS_SERVER(dir),
2294                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2295                                 &exception);
2296         } while (exception.retry);
2297         return err;
2298 }
2299
2300 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2301                  struct nfs_fsstat *fsstat)
2302 {
2303         struct nfs4_statfs_arg args = {
2304                 .fh = fhandle,
2305                 .bitmask = server->attr_bitmask,
2306         };
2307         struct rpc_message msg = {
2308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2309                 .rpc_argp = &args,
2310                 .rpc_resp = fsstat,
2311         };
2312
2313         nfs_fattr_init(fsstat->fattr);
2314         return rpc_call_sync(server->client, &msg, 0);
2315 }
2316
2317 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2318 {
2319         struct nfs4_exception exception = { };
2320         int err;
2321         do {
2322                 err = nfs4_handle_exception(server,
2323                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2324                                 &exception);
2325         } while (exception.retry);
2326         return err;
2327 }
2328
2329 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2330                 struct nfs_fsinfo *fsinfo)
2331 {
2332         struct nfs4_fsinfo_arg args = {
2333                 .fh = fhandle,
2334                 .bitmask = server->attr_bitmask,
2335         };
2336         struct rpc_message msg = {
2337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2338                 .rpc_argp = &args,
2339                 .rpc_resp = fsinfo,
2340         };
2341
2342         return rpc_call_sync(server->client, &msg, 0);
2343 }
2344
2345 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2346 {
2347         struct nfs4_exception exception = { };
2348         int err;
2349
2350         do {
2351                 err = nfs4_handle_exception(server,
2352                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2353                                 &exception);
2354         } while (exception.retry);
2355         return err;
2356 }
2357
2358 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2359 {
2360         nfs_fattr_init(fsinfo->fattr);
2361         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2362 }
2363
2364 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2365                 struct nfs_pathconf *pathconf)
2366 {
2367         struct nfs4_pathconf_arg args = {
2368                 .fh = fhandle,
2369                 .bitmask = server->attr_bitmask,
2370         };
2371         struct rpc_message msg = {
2372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2373                 .rpc_argp = &args,
2374                 .rpc_resp = pathconf,
2375         };
2376
2377         /* None of the pathconf attributes are mandatory to implement */
2378         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2379                 memset(pathconf, 0, sizeof(*pathconf));
2380                 return 0;
2381         }
2382
2383         nfs_fattr_init(pathconf->fattr);
2384         return rpc_call_sync(server->client, &msg, 0);
2385 }
2386
2387 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2388                 struct nfs_pathconf *pathconf)
2389 {
2390         struct nfs4_exception exception = { };
2391         int err;
2392
2393         do {
2394                 err = nfs4_handle_exception(server,
2395                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2396                                 &exception);
2397         } while (exception.retry);
2398         return err;
2399 }
2400
2401 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2402 {
2403         struct nfs_server *server = NFS_SERVER(data->inode);
2404
2405         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2406                 rpc_restart_call(task);
2407                 return -EAGAIN;
2408         }
2409
2410         nfs_invalidate_atime(data->inode);
2411         if (task->tk_status > 0)
2412                 renew_lease(server, data->timestamp);
2413         return 0;
2414 }
2415
2416 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2417 {
2418         struct rpc_message msg = {
2419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2420                 .rpc_argp = &data->args,
2421                 .rpc_resp = &data->res,
2422                 .rpc_cred = data->cred,
2423         };
2424
2425         data->timestamp   = jiffies;
2426
2427         rpc_call_setup(&data->task, &msg, 0);
2428 }
2429
2430 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2431 {
2432         struct inode *inode = data->inode;
2433
2434         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2435                 rpc_restart_call(task);
2436                 return -EAGAIN;
2437         }
2438         if (task->tk_status >= 0) {
2439                 renew_lease(NFS_SERVER(inode), data->timestamp);
2440                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2441         }
2442         return 0;
2443 }
2444
2445 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2446 {
2447         struct rpc_message msg = {
2448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2449                 .rpc_argp = &data->args,
2450                 .rpc_resp = &data->res,
2451                 .rpc_cred = data->cred,
2452         };
2453         struct inode *inode = data->inode;
2454         struct nfs_server *server = NFS_SERVER(inode);
2455         int stable;
2456
2457         if (how & FLUSH_STABLE) {
2458                 if (!NFS_I(inode)->ncommit)
2459                         stable = NFS_FILE_SYNC;
2460                 else
2461                         stable = NFS_DATA_SYNC;
2462         } else
2463                 stable = NFS_UNSTABLE;
2464         data->args.stable = stable;
2465         data->args.bitmask = server->attr_bitmask;
2466         data->res.server = server;
2467
2468         data->timestamp   = jiffies;
2469
2470         /* Finalize the task. */
2471         rpc_call_setup(&data->task, &msg, 0);
2472 }
2473
2474 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2475 {
2476         struct inode *inode = data->inode;
2477
2478         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2479                 rpc_restart_call(task);
2480                 return -EAGAIN;
2481         }
2482         nfs_refresh_inode(inode, data->res.fattr);
2483         return 0;
2484 }
2485
2486 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2487 {
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2490                 .rpc_argp = &data->args,
2491                 .rpc_resp = &data->res,
2492                 .rpc_cred = data->cred,
2493         };
2494         struct nfs_server *server = NFS_SERVER(data->inode);
2495
2496         data->args.bitmask = server->attr_bitmask;
2497         data->res.server = server;
2498
2499         rpc_call_setup(&data->task, &msg, 0);
2500 }
2501
2502 /*
2503  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2504  * standalone procedure for queueing an asynchronous RENEW.
2505  */
2506 static void nfs4_renew_done(struct rpc_task *task, void *data)
2507 {
2508         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2509         unsigned long timestamp = (unsigned long)data;
2510
2511         if (task->tk_status < 0) {
2512                 switch (task->tk_status) {
2513                         case -NFS4ERR_STALE_CLIENTID:
2514                         case -NFS4ERR_EXPIRED:
2515                         case -NFS4ERR_CB_PATH_DOWN:
2516                                 nfs4_schedule_state_recovery(clp);
2517                 }
2518                 return;
2519         }
2520         spin_lock(&clp->cl_lock);
2521         if (time_before(clp->cl_last_renewal,timestamp))
2522                 clp->cl_last_renewal = timestamp;
2523         spin_unlock(&clp->cl_lock);
2524 }
2525
2526 static const struct rpc_call_ops nfs4_renew_ops = {
2527         .rpc_call_done = nfs4_renew_done,
2528 };
2529
2530 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2531 {
2532         struct rpc_message msg = {
2533                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2534                 .rpc_argp       = clp,
2535                 .rpc_cred       = cred,
2536         };
2537
2538         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2539                         &nfs4_renew_ops, (void *)jiffies);
2540 }
2541
2542 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2543 {
2544         struct rpc_message msg = {
2545                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2546                 .rpc_argp       = clp,
2547                 .rpc_cred       = cred,
2548         };
2549         unsigned long now = jiffies;
2550         int status;
2551
2552         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2553         if (status < 0)
2554                 return status;
2555         spin_lock(&clp->cl_lock);
2556         if (time_before(clp->cl_last_renewal,now))
2557                 clp->cl_last_renewal = now;
2558         spin_unlock(&clp->cl_lock);
2559         return 0;
2560 }
2561
2562 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2563 {
2564         return (server->caps & NFS_CAP_ACLS)
2565                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2566                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2567 }
2568
2569 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2570  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2571  * the stack.
2572  */
2573 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2574
2575 static void buf_to_pages(const void *buf, size_t buflen,
2576                 struct page **pages, unsigned int *pgbase)
2577 {
2578         const void *p = buf;
2579
2580         *pgbase = offset_in_page(buf);
2581         p -= *pgbase;
2582         while (p < buf + buflen) {
2583                 *(pages++) = virt_to_page(p);
2584                 p += PAGE_CACHE_SIZE;
2585         }
2586 }
2587
2588 struct nfs4_cached_acl {
2589         int cached;
2590         size_t len;
2591         char data[0];
2592 };
2593
2594 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2595 {
2596         struct nfs_inode *nfsi = NFS_I(inode);
2597
2598         spin_lock(&inode->i_lock);
2599         kfree(nfsi->nfs4_acl);
2600         nfsi->nfs4_acl = acl;
2601         spin_unlock(&inode->i_lock);
2602 }
2603
2604 static void nfs4_zap_acl_attr(struct inode *inode)
2605 {
2606         nfs4_set_cached_acl(inode, NULL);
2607 }
2608
2609 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2610 {
2611         struct nfs_inode *nfsi = NFS_I(inode);
2612         struct nfs4_cached_acl *acl;
2613         int ret = -ENOENT;
2614
2615         spin_lock(&inode->i_lock);
2616         acl = nfsi->nfs4_acl;
2617         if (acl == NULL)
2618                 goto out;
2619         if (buf == NULL) /* user is just asking for length */
2620                 goto out_len;
2621         if (acl->cached == 0)
2622                 goto out;
2623         ret = -ERANGE; /* see getxattr(2) man page */
2624         if (acl->len > buflen)
2625                 goto out;
2626         memcpy(buf, acl->data, acl->len);
2627 out_len:
2628         ret = acl->len;
2629 out:
2630         spin_unlock(&inode->i_lock);
2631         return ret;
2632 }
2633
2634 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2635 {
2636         struct nfs4_cached_acl *acl;
2637
2638         if (buf && acl_len <= PAGE_SIZE) {
2639                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2640                 if (acl == NULL)
2641                         goto out;
2642                 acl->cached = 1;
2643                 memcpy(acl->data, buf, acl_len);
2644         } else {
2645                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2646                 if (acl == NULL)
2647                         goto out;
2648                 acl->cached = 0;
2649         }
2650         acl->len = acl_len;
2651 out:
2652         nfs4_set_cached_acl(inode, acl);
2653 }
2654
2655 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2656 {
2657         struct page *pages[NFS4ACL_MAXPAGES];
2658         struct nfs_getaclargs args = {
2659                 .fh = NFS_FH(inode),
2660                 .acl_pages = pages,
2661                 .acl_len = buflen,
2662         };
2663         size_t resp_len = buflen;
2664         void *resp_buf;
2665         struct rpc_message msg = {
2666                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2667                 .rpc_argp = &args,
2668                 .rpc_resp = &resp_len,
2669         };
2670         struct page *localpage = NULL;
2671         int ret;
2672
2673         if (buflen < PAGE_SIZE) {
2674                 /* As long as we're doing a round trip to the server anyway,
2675                  * let's be prepared for a page of acl data. */
2676                 localpage = alloc_page(GFP_KERNEL);
2677                 resp_buf = page_address(localpage);
2678                 if (localpage == NULL)
2679                         return -ENOMEM;
2680                 args.acl_pages[0] = localpage;
2681                 args.acl_pgbase = 0;
2682                 resp_len = args.acl_len = PAGE_SIZE;
2683         } else {
2684                 resp_buf = buf;
2685                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2686         }
2687         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2688         if (ret)
2689                 goto out_free;
2690         if (resp_len > args.acl_len)
2691                 nfs4_write_cached_acl(inode, NULL, resp_len);
2692         else
2693                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2694         if (buf) {
2695                 ret = -ERANGE;
2696                 if (resp_len > buflen)
2697                         goto out_free;
2698                 if (localpage)
2699                         memcpy(buf, resp_buf, resp_len);
2700         }
2701         ret = resp_len;
2702 out_free:
2703         if (localpage)
2704                 __free_page(localpage);
2705         return ret;
2706 }
2707
2708 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2709 {
2710         struct nfs4_exception exception = { };
2711         ssize_t ret;
2712         do {
2713                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2714                 if (ret >= 0)
2715                         break;
2716                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2717         } while (exception.retry);
2718         return ret;
2719 }
2720
2721 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2722 {
2723         struct nfs_server *server = NFS_SERVER(inode);
2724         int ret;
2725
2726         if (!nfs4_server_supports_acls(server))
2727                 return -EOPNOTSUPP;
2728         ret = nfs_revalidate_inode(server, inode);
2729         if (ret < 0)
2730                 return ret;
2731         ret = nfs4_read_cached_acl(inode, buf, buflen);
2732         if (ret != -ENOENT)
2733                 return ret;
2734         return nfs4_get_acl_uncached(inode, buf, buflen);
2735 }
2736
2737 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2738 {
2739         struct nfs_server *server = NFS_SERVER(inode);
2740         struct page *pages[NFS4ACL_MAXPAGES];
2741         struct nfs_setaclargs arg = {
2742                 .fh             = NFS_FH(inode),
2743                 .acl_pages      = pages,
2744                 .acl_len        = buflen,
2745         };
2746         struct rpc_message msg = {
2747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2748                 .rpc_argp       = &arg,
2749                 .rpc_resp       = NULL,
2750         };
2751         int ret;
2752
2753         if (!nfs4_server_supports_acls(server))
2754                 return -EOPNOTSUPP;
2755         nfs_inode_return_delegation(inode);
2756         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2757         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2758         nfs_zap_caches(inode);
2759         return ret;
2760 }
2761
2762 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2763 {
2764         struct nfs4_exception exception = { };
2765         int err;
2766         do {
2767                 err = nfs4_handle_exception(NFS_SERVER(inode),
2768                                 __nfs4_proc_set_acl(inode, buf, buflen),
2769                                 &exception);
2770         } while (exception.retry);
2771         return err;
2772 }
2773
2774 static int
2775 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2776 {
2777         struct nfs_client *clp = server->nfs_client;
2778
2779         if (!clp || task->tk_status >= 0)
2780                 return 0;
2781         switch(task->tk_status) {
2782                 case -NFS4ERR_STALE_CLIENTID:
2783                 case -NFS4ERR_STALE_STATEID:
2784                 case -NFS4ERR_EXPIRED:
2785                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2786                         nfs4_schedule_state_recovery(clp);
2787                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2788                                 rpc_wake_up_task(task);
2789                         task->tk_status = 0;
2790                         return -EAGAIN;
2791                 case -NFS4ERR_DELAY:
2792                         nfs_inc_server_stats((struct nfs_server *) server,
2793                                                 NFSIOS_DELAY);
2794                 case -NFS4ERR_GRACE:
2795                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2796                         task->tk_status = 0;
2797                         return -EAGAIN;
2798                 case -NFS4ERR_OLD_STATEID:
2799                         task->tk_status = 0;
2800                         return -EAGAIN;
2801         }
2802         task->tk_status = nfs4_map_errors(task->tk_status);
2803         return 0;
2804 }
2805
2806 static int nfs4_wait_bit_killable(void *word)
2807 {
2808         if (fatal_signal_pending(current))
2809                 return -ERESTARTSYS;
2810         schedule();
2811         return 0;
2812 }
2813
2814 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2815 {
2816         int res;
2817
2818         might_sleep();
2819
2820         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2821
2822         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2823                         nfs4_wait_bit_killable, TASK_KILLABLE);
2824
2825         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2826         return res;
2827 }
2828
2829 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2830 {
2831         int res = 0;
2832
2833         might_sleep();
2834
2835         if (*timeout <= 0)
2836                 *timeout = NFS4_POLL_RETRY_MIN;
2837         if (*timeout > NFS4_POLL_RETRY_MAX)
2838                 *timeout = NFS4_POLL_RETRY_MAX;
2839         schedule_timeout_killable(*timeout);
2840         if (fatal_signal_pending(current))
2841                 res = -ERESTARTSYS;
2842         *timeout <<= 1;
2843         return res;
2844 }
2845
2846 /* This is the error handling routine for processes that are allowed
2847  * to sleep.
2848  */
2849 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2850 {
2851         struct nfs_client *clp = server->nfs_client;
2852         int ret = errorcode;
2853
2854         exception->retry = 0;
2855         switch(errorcode) {
2856                 case 0:
2857                         return 0;
2858                 case -NFS4ERR_STALE_CLIENTID:
2859                 case -NFS4ERR_STALE_STATEID:
2860                 case -NFS4ERR_EXPIRED:
2861                         nfs4_schedule_state_recovery(clp);
2862                         ret = nfs4_wait_clnt_recover(server->client, clp);
2863                         if (ret == 0)
2864                                 exception->retry = 1;
2865                         break;
2866                 case -NFS4ERR_FILE_OPEN:
2867                 case -NFS4ERR_GRACE:
2868                 case -NFS4ERR_DELAY:
2869                         ret = nfs4_delay(server->client, &exception->timeout);
2870                         if (ret != 0)
2871                                 break;
2872                 case -NFS4ERR_OLD_STATEID:
2873                         exception->retry = 1;
2874         }
2875         /* We failed to handle the error */
2876         return nfs4_map_errors(ret);
2877 }
2878
2879 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2880 {
2881         nfs4_verifier sc_verifier;
2882         struct nfs4_setclientid setclientid = {
2883                 .sc_verifier = &sc_verifier,
2884                 .sc_prog = program,
2885         };
2886         struct rpc_message msg = {
2887                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2888                 .rpc_argp = &setclientid,
2889                 .rpc_resp = clp,
2890                 .rpc_cred = cred,
2891         };
2892         __be32 *p;
2893         int loop = 0;
2894         int status;
2895
2896         p = (__be32*)sc_verifier.data;
2897         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2898         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2899
2900         for(;;) {
2901                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2902                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2903                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2904                                 cred->cr_ops->cr_name,
2905                                 clp->cl_id_uniquifier);
2906                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2907                                 sizeof(setclientid.sc_netid), "tcp");
2908                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2909                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2910                                 clp->cl_ipaddr, port >> 8, port & 255);
2911
2912                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2913                 if (status != -NFS4ERR_CLID_INUSE)
2914                         break;
2915                 if (signalled())
2916                         break;
2917                 if (loop++ & 1)
2918                         ssleep(clp->cl_lease_time + 1);
2919                 else
2920                         if (++clp->cl_id_uniquifier == 0)
2921                                 break;
2922         }
2923         return status;
2924 }
2925
2926 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2927 {
2928         struct nfs_fsinfo fsinfo;
2929         struct rpc_message msg = {
2930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2931                 .rpc_argp = clp,
2932                 .rpc_resp = &fsinfo,
2933                 .rpc_cred = cred,
2934         };
2935         unsigned long now;
2936         int status;
2937
2938         now = jiffies;
2939         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2940         if (status == 0) {
2941                 spin_lock(&clp->cl_lock);
2942                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2943                 clp->cl_last_renewal = now;
2944                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2945                 spin_unlock(&clp->cl_lock);
2946         }
2947         return status;
2948 }
2949
2950 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2951 {
2952         long timeout;
2953         int err;
2954         do {
2955                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2956                 switch (err) {
2957                         case 0:
2958                                 return err;
2959                         case -NFS4ERR_RESOURCE:
2960                                 /* The IBM lawyers misread another document! */
2961                         case -NFS4ERR_DELAY:
2962                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2963                 }
2964         } while (err == 0);
2965         return err;
2966 }
2967
2968 struct nfs4_delegreturndata {
2969         struct nfs4_delegreturnargs args;
2970         struct nfs4_delegreturnres res;
2971         struct nfs_fh fh;
2972         nfs4_stateid stateid;
2973         struct rpc_cred *cred;
2974         unsigned long timestamp;
2975         struct nfs_fattr fattr;
2976         int rpc_status;
2977 };
2978
2979 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2980 {
2981         struct nfs4_delegreturndata *data = calldata;
2982         struct rpc_message msg = {
2983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2984                 .rpc_argp = &data->args,
2985                 .rpc_resp = &data->res,
2986                 .rpc_cred = data->cred,
2987         };
2988         nfs_fattr_init(data->res.fattr);
2989         rpc_call_setup(task, &msg, 0);
2990 }
2991
2992 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2993 {
2994         struct nfs4_delegreturndata *data = calldata;
2995         data->rpc_status = task->tk_status;
2996         if (data->rpc_status == 0)
2997                 renew_lease(data->res.server, data->timestamp);
2998 }
2999
3000 static void nfs4_delegreturn_release(void *calldata)
3001 {
3002         struct nfs4_delegreturndata *data = calldata;
3003
3004         put_rpccred(data->cred);
3005         kfree(calldata);
3006 }
3007
3008 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3009         .rpc_call_prepare = nfs4_delegreturn_prepare,
3010         .rpc_call_done = nfs4_delegreturn_done,
3011         .rpc_release = nfs4_delegreturn_release,
3012 };
3013
3014 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3015 {
3016         struct nfs4_delegreturndata *data;
3017         struct nfs_server *server = NFS_SERVER(inode);
3018         struct rpc_task *task;
3019         int status;
3020
3021         data = kmalloc(sizeof(*data), GFP_KERNEL);
3022         if (data == NULL)
3023                 return -ENOMEM;
3024         data->args.fhandle = &data->fh;
3025         data->args.stateid = &data->stateid;
3026         data->args.bitmask = server->attr_bitmask;
3027         nfs_copy_fh(&data->fh, NFS_FH(inode));
3028         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3029         data->res.fattr = &data->fattr;
3030         data->res.server = server;
3031         data->cred = get_rpccred(cred);
3032         data->timestamp = jiffies;
3033         data->rpc_status = 0;
3034
3035         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3036         if (IS_ERR(task))
3037                 return PTR_ERR(task);
3038         status = nfs4_wait_for_completion_rpc_task(task);
3039         if (status == 0) {
3040                 status = data->rpc_status;
3041                 if (status == 0)
3042                         nfs_refresh_inode(inode, &data->fattr);
3043         }
3044         rpc_put_task(task);
3045         return status;
3046 }
3047
3048 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3049 {
3050         struct nfs_server *server = NFS_SERVER(inode);
3051         struct nfs4_exception exception = { };
3052         int err;
3053         do {
3054                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3055                 switch (err) {
3056                         case -NFS4ERR_STALE_STATEID:
3057                         case -NFS4ERR_EXPIRED:
3058                         case 0:
3059                                 return 0;
3060                 }
3061                 err = nfs4_handle_exception(server, err, &exception);
3062         } while (exception.retry);
3063         return err;
3064 }
3065
3066 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3067 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3068
3069 /*
3070  * sleep, with exponential backoff, and retry the LOCK operation.
3071  */
3072 static unsigned long
3073 nfs4_set_lock_task_retry(unsigned long timeout)
3074 {
3075         schedule_timeout_killable(timeout);
3076         timeout <<= 1;
3077         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3078                 return NFS4_LOCK_MAXTIMEOUT;
3079         return timeout;
3080 }
3081
3082 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3083 {
3084         struct inode *inode = state->inode;
3085         struct nfs_server *server = NFS_SERVER(inode);
3086         struct nfs_client *clp = server->nfs_client;
3087         struct nfs_lockt_args arg = {
3088                 .fh = NFS_FH(inode),
3089                 .fl = request,
3090         };
3091         struct nfs_lockt_res res = {
3092                 .denied = request,
3093         };
3094         struct rpc_message msg = {
3095                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3096                 .rpc_argp       = &arg,
3097                 .rpc_resp       = &res,
3098                 .rpc_cred       = state->owner->so_cred,
3099         };
3100         struct nfs4_lock_state *lsp;
3101         int status;
3102
3103         down_read(&clp->cl_sem);
3104         arg.lock_owner.clientid = clp->cl_clientid;
3105         status = nfs4_set_lock_state(state, request);
3106         if (status != 0)
3107                 goto out;
3108         lsp = request->fl_u.nfs4_fl.owner;
3109         arg.lock_owner.id = lsp->ls_id.id;
3110         status = rpc_call_sync(server->client, &msg, 0);
3111         switch (status) {
3112                 case 0:
3113                         request->fl_type = F_UNLCK;
3114                         break;
3115                 case -NFS4ERR_DENIED:
3116                         status = 0;
3117         }
3118         request->fl_ops->fl_release_private(request);
3119 out:
3120         up_read(&clp->cl_sem);
3121         return status;
3122 }
3123
3124 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3125 {
3126         struct nfs4_exception exception = { };
3127         int err;
3128
3129         do {
3130                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3131                                 _nfs4_proc_getlk(state, cmd, request),
3132                                 &exception);
3133         } while (exception.retry);
3134         return err;
3135 }
3136
3137 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3138 {
3139         int res = 0;
3140         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3141                 case FL_POSIX:
3142                         res = posix_lock_file_wait(file, fl);
3143                         break;
3144                 case FL_FLOCK:
3145                         res = flock_lock_file_wait(file, fl);
3146                         break;
3147                 default:
3148                         BUG();
3149         }
3150         return res;
3151 }
3152
3153 struct nfs4_unlockdata {
3154         struct nfs_locku_args arg;
3155         struct nfs_locku_res res;
3156         struct nfs4_lock_state *lsp;
3157         struct nfs_open_context *ctx;
3158         struct file_lock fl;
3159         const struct nfs_server *server;
3160         unsigned long timestamp;
3161 };
3162
3163 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3164                 struct nfs_open_context *ctx,
3165                 struct nfs4_lock_state *lsp,
3166                 struct nfs_seqid *seqid)
3167 {
3168         struct nfs4_unlockdata *p;
3169         struct inode *inode = lsp->ls_state->inode;
3170
3171         p = kmalloc(sizeof(*p), GFP_KERNEL);
3172         if (p == NULL)
3173                 return NULL;
3174         p->arg.fh = NFS_FH(inode);
3175         p->arg.fl = &p->fl;
3176         p->arg.seqid = seqid;
3177         p->arg.stateid = &lsp->ls_stateid;
3178         p->lsp = lsp;
3179         atomic_inc(&lsp->ls_count);
3180         /* Ensure we don't close file until we're done freeing locks! */
3181         p->ctx = get_nfs_open_context(ctx);
3182         memcpy(&p->fl, fl, sizeof(p->fl));
3183         p->server = NFS_SERVER(inode);
3184         return p;
3185 }
3186
3187 static void nfs4_locku_release_calldata(void *data)
3188 {
3189         struct nfs4_unlockdata *calldata = data;
3190         nfs_free_seqid(calldata->arg.seqid);
3191         nfs4_put_lock_state(calldata->lsp);
3192         put_nfs_open_context(calldata->ctx);
3193         kfree(calldata);
3194 }
3195
3196 static void nfs4_locku_done(struct rpc_task *task, void *data)
3197 {
3198         struct nfs4_unlockdata *calldata = data;
3199
3200         if (RPC_ASSASSINATED(task))
3201                 return;
3202         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3203         switch (task->tk_status) {
3204                 case 0:
3205                         memcpy(calldata->lsp->ls_stateid.data,
3206                                         calldata->res.stateid.data,
3207                                         sizeof(calldata->lsp->ls_stateid.data));
3208                         renew_lease(calldata->server, calldata->timestamp);
3209                         break;
3210                 case -NFS4ERR_STALE_STATEID:
3211                 case -NFS4ERR_EXPIRED:
3212                         break;
3213                 default:
3214                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3215                                 rpc_restart_call(task);
3216         }
3217 }
3218
3219 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3220 {
3221         struct nfs4_unlockdata *calldata = data;
3222         struct rpc_message msg = {
3223                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3224                 .rpc_argp       = &calldata->arg,
3225                 .rpc_resp       = &calldata->res,
3226                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3227         };
3228
3229         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3230                 return;
3231         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3232                 /* Note: exit _without_ running nfs4_locku_done */
3233                 task->tk_action = NULL;
3234                 return;
3235         }
3236         calldata->timestamp = jiffies;
3237         rpc_call_setup(task, &msg, 0);
3238 }
3239
3240 static const struct rpc_call_ops nfs4_locku_ops = {
3241         .rpc_call_prepare = nfs4_locku_prepare,
3242         .rpc_call_done = nfs4_locku_done,
3243         .rpc_release = nfs4_locku_release_calldata,
3244 };
3245
3246 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3247                 struct nfs_open_context *ctx,
3248                 struct nfs4_lock_state *lsp,
3249                 struct nfs_seqid *seqid)
3250 {
3251         struct nfs4_unlockdata *data;
3252
3253         /* Ensure this is an unlock - when canceling a lock, the
3254          * canceled lock is passed in, and it won't be an unlock.
3255          */
3256         fl->fl_type = F_UNLCK;
3257
3258         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3259         if (data == NULL) {
3260                 nfs_free_seqid(seqid);
3261                 return ERR_PTR(-ENOMEM);
3262         }
3263
3264         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3265 }
3266
3267 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3268 {
3269         struct nfs_seqid *seqid;
3270         struct nfs4_lock_state *lsp;
3271         struct rpc_task *task;
3272         int status = 0;
3273
3274         status = nfs4_set_lock_state(state, request);
3275         /* Unlock _before_ we do the RPC call */
3276         request->fl_flags |= FL_EXISTS;
3277         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3278                 goto out;
3279         if (status != 0)
3280                 goto out;
3281         /* Is this a delegated lock? */
3282         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3283                 goto out;
3284         lsp = request->fl_u.nfs4_fl.owner;
3285         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3286         status = -ENOMEM;
3287         if (seqid == NULL)
3288                 goto out;
3289         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3290         status = PTR_ERR(task);
3291         if (IS_ERR(task))
3292                 goto out;
3293         status = nfs4_wait_for_completion_rpc_task(task);
3294         rpc_put_task(task);
3295 out:
3296         return status;
3297 }
3298
3299 struct nfs4_lockdata {
3300         struct nfs_lock_args arg;
3301         struct nfs_lock_res res;
3302         struct nfs4_lock_state *lsp;
3303         struct nfs_open_context *ctx;
3304         struct file_lock fl;
3305         unsigned long timestamp;
3306         int rpc_status;
3307         int cancelled;
3308 };
3309
3310 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3311                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3312 {
3313         struct nfs4_lockdata *p;
3314         struct inode *inode = lsp->ls_state->inode;
3315         struct nfs_server *server = NFS_SERVER(inode);
3316
3317         p = kzalloc(sizeof(*p), GFP_KERNEL);
3318         if (p == NULL)
3319                 return NULL;
3320
3321         p->arg.fh = NFS_FH(inode);
3322         p->arg.fl = &p->fl;
3323         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3324         if (p->arg.lock_seqid == NULL)
3325                 goto out_free;
3326         p->arg.lock_stateid = &lsp->ls_stateid;
3327         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3328         p->arg.lock_owner.id = lsp->ls_id.id;
3329         p->lsp = lsp;
3330         atomic_inc(&lsp->ls_count);
3331         p->ctx = get_nfs_open_context(ctx);
3332         memcpy(&p->fl, fl, sizeof(p->fl));
3333         return p;
3334 out_free:
3335         kfree(p);
3336         return NULL;
3337 }
3338
3339 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3340 {
3341         struct nfs4_lockdata *data = calldata;
3342         struct nfs4_state *state = data->lsp->ls_state;
3343         struct nfs4_state_owner *sp = state->owner;
3344         struct rpc_message msg = {
3345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3346                 .rpc_argp = &data->arg,
3347                 .rpc_resp = &data->res,
3348                 .rpc_cred = sp->so_cred,
3349         };
3350
3351         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3352                 return;
3353         dprintk("%s: begin!\n", __FUNCTION__);
3354         /* Do we need to do an open_to_lock_owner? */
3355         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3356                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3357                 if (data->arg.open_seqid == NULL) {
3358                         data->rpc_status = -ENOMEM;
3359                         task->tk_action = NULL;
3360                         goto out;
3361                 }
3362                 data->arg.open_stateid = &state->stateid;
3363                 data->arg.new_lock_owner = 1;
3364         }
3365         data->timestamp = jiffies;
3366         rpc_call_setup(task, &msg, 0);
3367 out:
3368         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3369 }
3370
3371 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3372 {
3373         struct nfs4_lockdata *data = calldata;
3374
3375         dprintk("%s: begin!\n", __FUNCTION__);
3376
3377         data->rpc_status = task->tk_status;
3378         if (RPC_ASSASSINATED(task))
3379                 goto out;
3380         if (data->arg.new_lock_owner != 0) {
3381                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3382                 if (data->rpc_status == 0)
3383                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3384                 else
3385                         goto out;
3386         }
3387         if (data->rpc_status == 0) {
3388                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3389                                         sizeof(data->lsp->ls_stateid.data));
3390                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3391                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3392         }
3393         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3394 out:
3395         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3396 }
3397
3398 static void nfs4_lock_release(void *calldata)
3399 {
3400         struct nfs4_lockdata *data = calldata;
3401
3402         dprintk("%s: begin!\n", __FUNCTION__);
3403         if (data->arg.open_seqid != NULL)
3404                 nfs_free_seqid(data->arg.open_seqid);
3405         if (data->cancelled != 0) {
3406                 struct rpc_task *task;
3407                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3408                                 data->arg.lock_seqid);
3409                 if (!IS_ERR(task))
3410                         rpc_put_task(task);
3411                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3412         } else
3413                 nfs_free_seqid(data->arg.lock_seqid);
3414         nfs4_put_lock_state(data->lsp);
3415         put_nfs_open_context(data->ctx);
3416         kfree(data);
3417         dprintk("%s: done!\n", __FUNCTION__);
3418 }
3419
3420 static const struct rpc_call_ops nfs4_lock_ops = {
3421         .rpc_call_prepare = nfs4_lock_prepare,
3422         .rpc_call_done = nfs4_lock_done,
3423         .rpc_release = nfs4_lock_release,
3424 };
3425
3426 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3427 {
3428         struct nfs4_lockdata *data;
3429         struct rpc_task *task;
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         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3442                         &nfs4_lock_ops, data);
3443         if (IS_ERR(task))
3444                 return PTR_ERR(task);
3445         ret = nfs4_wait_for_completion_rpc_task(task);
3446         if (ret == 0) {
3447                 ret = data->rpc_status;
3448                 if (ret == -NFS4ERR_DENIED)
3449                         ret = -EAGAIN;
3450         } else
3451                 data->cancelled = 1;
3452         rpc_put_task(task);
3453         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3454         return ret;
3455 }
3456
3457 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3458 {
3459         struct nfs_server *server = NFS_SERVER(state->inode);
3460         struct nfs4_exception exception = { };
3461         int err;
3462
3463         do {
3464                 /* Cache the lock if possible... */
3465                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3466                         return 0;
3467                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3468                 if (err != -NFS4ERR_DELAY)
3469                         break;
3470                 nfs4_handle_exception(server, err, &exception);
3471         } while (exception.retry);
3472         return err;
3473 }
3474
3475 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3476 {
3477         struct nfs_server *server = NFS_SERVER(state->inode);
3478         struct nfs4_exception exception = { };
3479         int err;
3480
3481         err = nfs4_set_lock_state(state, request);
3482         if (err != 0)
3483                 return err;
3484         do {
3485                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3486                         return 0;
3487                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3488                 if (err != -NFS4ERR_DELAY)
3489                         break;
3490                 nfs4_handle_exception(server, err, &exception);
3491         } while (exception.retry);
3492         return err;
3493 }
3494
3495 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3496 {
3497         struct nfs_client *clp = state->owner->so_client;
3498         unsigned char fl_flags = request->fl_flags;
3499         int status;
3500
3501         /* Is this a delegated open? */
3502         status = nfs4_set_lock_state(state, request);
3503         if (status != 0)
3504                 goto out;
3505         request->fl_flags |= FL_ACCESS;
3506         status = do_vfs_lock(request->fl_file, request);
3507         if (status < 0)
3508                 goto out;
3509         down_read(&clp->cl_sem);
3510         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3511                 struct nfs_inode *nfsi = NFS_I(state->inode);
3512                 /* Yes: cache locks! */
3513                 down_read(&nfsi->rwsem);
3514                 /* ...but avoid races with delegation recall... */
3515                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3516                         request->fl_flags = fl_flags & ~FL_SLEEP;
3517                         status = do_vfs_lock(request->fl_file, request);
3518                         up_read(&nfsi->rwsem);
3519                         goto out_unlock;
3520                 }
3521                 up_read(&nfsi->rwsem);
3522         }
3523         status = _nfs4_do_setlk(state, cmd, request, 0);
3524         if (status != 0)
3525                 goto out_unlock;
3526         /* Note: we always want to sleep here! */
3527         request->fl_flags = fl_flags | FL_SLEEP;
3528         if (do_vfs_lock(request->fl_file, request) < 0)
3529                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3530 out_unlock:
3531         up_read(&clp->cl_sem);
3532 out:
3533         request->fl_flags = fl_flags;
3534         return status;
3535 }
3536
3537 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3538 {
3539         struct nfs4_exception exception = { };
3540         int err;
3541
3542         do {
3543                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3544                                 _nfs4_proc_setlk(state, cmd, request),
3545                                 &exception);
3546         } while (exception.retry);
3547         return err;
3548 }
3549
3550 static int
3551 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3552 {
3553         struct nfs_open_context *ctx;
3554         struct nfs4_state *state;
3555         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3556         int status;
3557
3558         /* verify open state */
3559         ctx = nfs_file_open_context(filp);
3560         state = ctx->state;
3561
3562         if (request->fl_start < 0 || request->fl_end < 0)
3563                 return -EINVAL;
3564
3565         if (IS_GETLK(cmd))
3566                 return nfs4_proc_getlk(state, F_GETLK, request);
3567
3568         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3569                 return -EINVAL;
3570
3571         if (request->fl_type == F_UNLCK)
3572                 return nfs4_proc_unlck(state, cmd, request);
3573
3574         do {
3575                 status = nfs4_proc_setlk(state, cmd, request);
3576                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3577                         break;
3578                 timeout = nfs4_set_lock_task_retry(timeout);
3579                 status = -ERESTARTSYS;
3580                 if (signalled())
3581                         break;
3582         } while(status < 0);
3583         return status;
3584 }
3585
3586 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3587 {
3588         struct nfs_server *server = NFS_SERVER(state->inode);
3589         struct nfs4_exception exception = { };
3590         int err;
3591
3592         err = nfs4_set_lock_state(state, fl);
3593         if (err != 0)
3594                 goto out;
3595         do {
3596                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3597                 if (err != -NFS4ERR_DELAY)
3598                         break;
3599                 err = nfs4_handle_exception(server, err, &exception);
3600         } while (exception.retry);
3601 out:
3602         return err;
3603 }
3604
3605 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3606
3607 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3608                 size_t buflen, int flags)
3609 {
3610         struct inode *inode = dentry->d_inode;
3611
3612         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3613                 return -EOPNOTSUPP;
3614
3615         if (!S_ISREG(inode->i_mode) &&
3616             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3617                 return -EPERM;
3618
3619         return nfs4_proc_set_acl(inode, buf, buflen);
3620 }
3621
3622 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3623  * and that's what we'll do for e.g. user attributes that haven't been set.
3624  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3625  * attributes in kernel-managed attribute namespaces. */
3626 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3627                 size_t buflen)
3628 {
3629         struct inode *inode = dentry->d_inode;
3630
3631         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3632                 return -EOPNOTSUPP;
3633
3634         return nfs4_proc_get_acl(inode, buf, buflen);
3635 }
3636
3637 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3638 {
3639         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3640
3641         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3642                 return 0;
3643         if (buf && buflen < len)
3644                 return -ERANGE;
3645         if (buf)
3646                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3647         return len;
3648 }
3649
3650 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3651                 struct nfs4_fs_locations *fs_locations, struct page *page)
3652 {
3653         struct nfs_server *server = NFS_SERVER(dir);
3654         u32 bitmask[2] = {
3655                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3656                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3657         };
3658         struct nfs4_fs_locations_arg args = {
3659                 .dir_fh = NFS_FH(dir),
3660                 .name = name,
3661                 .page = page,
3662                 .bitmask = bitmask,
3663         };
3664         struct rpc_message msg = {
3665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3666                 .rpc_argp = &args,
3667                 .rpc_resp = fs_locations,
3668         };
3669         int status;
3670
3671         dprintk("%s: start\n", __FUNCTION__);
3672         nfs_fattr_init(&fs_locations->fattr);
3673         fs_locations->server = server;
3674         fs_locations->nlocations = 0;
3675         status = rpc_call_sync(server->client, &msg, 0);
3676         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3677         return status;
3678 }
3679
3680 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3681         .recover_open   = nfs4_open_reclaim,
3682         .recover_lock   = nfs4_lock_reclaim,
3683 };
3684
3685 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3686         .recover_open   = nfs4_open_expired,
3687         .recover_lock   = nfs4_lock_expired,
3688 };
3689
3690 static const struct inode_operations nfs4_file_inode_operations = {
3691         .permission     = nfs_permission,
3692         .getattr        = nfs_getattr,
3693         .setattr        = nfs_setattr,
3694         .getxattr       = nfs4_getxattr,
3695         .setxattr       = nfs4_setxattr,
3696         .listxattr      = nfs4_listxattr,
3697 };
3698
3699 const struct nfs_rpc_ops nfs_v4_clientops = {
3700         .version        = 4,                    /* protocol version */
3701         .dentry_ops     = &nfs4_dentry_operations,
3702         .dir_inode_ops  = &nfs4_dir_inode_operations,
3703         .file_inode_ops = &nfs4_file_inode_operations,
3704         .getroot        = nfs4_proc_get_root,
3705         .getattr        = nfs4_proc_getattr,
3706         .setattr        = nfs4_proc_setattr,
3707         .lookupfh       = nfs4_proc_lookupfh,
3708         .lookup         = nfs4_proc_lookup,
3709         .access         = nfs4_proc_access,
3710         .readlink       = nfs4_proc_readlink,
3711         .create         = nfs4_proc_create,
3712         .remove         = nfs4_proc_remove,
3713         .unlink_setup   = nfs4_proc_unlink_setup,
3714         .unlink_done    = nfs4_proc_unlink_done,
3715         .rename         = nfs4_proc_rename,
3716         .link           = nfs4_proc_link,
3717         .symlink        = nfs4_proc_symlink,
3718         .mkdir          = nfs4_proc_mkdir,
3719         .rmdir          = nfs4_proc_remove,
3720         .readdir        = nfs4_proc_readdir,
3721         .mknod          = nfs4_proc_mknod,
3722         .statfs         = nfs4_proc_statfs,
3723         .fsinfo         = nfs4_proc_fsinfo,
3724         .pathconf       = nfs4_proc_pathconf,
3725         .set_capabilities = nfs4_server_capabilities,
3726         .decode_dirent  = nfs4_decode_dirent,
3727         .read_setup     = nfs4_proc_read_setup,
3728         .read_done      = nfs4_read_done,
3729         .write_setup    = nfs4_proc_write_setup,
3730         .write_done     = nfs4_write_done,
3731         .commit_setup   = nfs4_proc_commit_setup,
3732         .commit_done    = nfs4_commit_done,
3733         .file_open      = nfs_open,
3734         .file_release   = nfs_release,
3735         .lock           = nfs4_proc_lock,
3736         .clear_acl_cache = nfs4_zap_acl_attr,
3737 };
3738
3739 /*
3740  * Local variables:
3741  *  c-basic-offset: 8
3742  * End:
3743  */