fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 197 {
 198         struct nfs_client *clp = server->nfs_client;
 199         spin_lock(&clp->cl_lock);
 200         if (time_before(clp->cl_last_renewal,timestamp))
 201                 clp->cl_last_renewal = timestamp;
 202         spin_unlock(&clp->cl_lock);
 203 }
 204
 205 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 206 {
 207         struct nfs_inode *nfsi = NFS_I(dir);
 208
 209         spin_lock(&dir->i_lock);
 210         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 211         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 212                 nfsi->change_attr = cinfo->after;
 213         spin_unlock(&dir->i_lock);
 214 }
 215
 216 struct nfs4_opendata {
 217         struct kref kref;
 218         struct nfs_openargs o_arg;
 219         struct nfs_openres o_res;
 220         struct nfs_open_confirmargs c_arg;
 221         struct nfs_open_confirmres c_res;
 222         struct nfs_fattr f_attr;
 223         struct nfs_fattr dir_attr;
 224         struct path path;
 225         struct dentry *dir;
 226         struct nfs4_state_owner *owner;
 227         struct iattr attrs;
 228         unsigned long timestamp;
 229         int rpc_status;
 230         int cancelled;
 231 };
 232
 233
 234 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 235 {
 236         p->o_res.f_attr = &p->f_attr;
 237         p->o_res.dir_attr = &p->dir_attr;
 238         p->o_res.server = p->o_arg.server;
 239         nfs_fattr_init(&p->f_attr);
 240         nfs_fattr_init(&p->dir_attr);
 241 }
 242
 243 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 244                 struct nfs4_state_owner *sp, int flags,
 245                 const struct iattr *attrs)
 246 {
 247         struct dentry *parent = dget_parent(path->dentry);
 248         struct inode *dir = parent->d_inode;
 249         struct nfs_server *server = NFS_SERVER(dir);
 250         struct nfs4_opendata *p;
 251
 252         p = kzalloc(sizeof(*p), GFP_KERNEL);
 253         if (p == NULL)
 254                 goto err;
 255         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 256         if (p->o_arg.seqid == NULL)
 257                 goto err_free;
 258         p->path.mnt = mntget(path->mnt);
 259         p->path.dentry = dget(path->dentry);
 260         p->dir = parent;
 261         p->owner = sp;
 262         atomic_inc(&sp->so_count);
 263         p->o_arg.fh = NFS_FH(dir);
 264         p->o_arg.open_flags = flags,
 265         p->o_arg.clientid = server->nfs_client->cl_clientid;
 266         p->o_arg.id = sp->so_owner_id.id;
 267         p->o_arg.name = &p->path.dentry->d_name;
 268         p->o_arg.server = server;
 269         p->o_arg.bitmask = server->attr_bitmask;
 270         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 271         if (flags & O_EXCL) {
 272                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 273                 s[0] = jiffies;
 274                 s[1] = current->pid;
 275         } else if (flags & O_CREAT) {
 276                 p->o_arg.u.attrs = &p->attrs;
 277                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 278         }
 279         p->c_arg.fh = &p->o_res.fh;
 280         p->c_arg.stateid = &p->o_res.stateid;
 281         p->c_arg.seqid = p->o_arg.seqid;
 282         nfs4_init_opendata_res(p);
 283         kref_init(&p->kref);
 284         return p;
 285 err_free:
 286         kfree(p);
 287 err:
 288         dput(parent);
 289         return NULL;
 290 }
 291
 292 static void nfs4_opendata_free(struct kref *kref)
 293 {
 294         struct nfs4_opendata *p = container_of(kref,
 295                         struct nfs4_opendata, kref);
 296
 297         nfs_free_seqid(p->o_arg.seqid);
 298         nfs4_put_state_owner(p->owner);
 299         dput(p->dir);
 300         dput(p->path.dentry);
 301         mntput(p->path.mnt);
 302         kfree(p);
 303 }
 304
 305 static void nfs4_opendata_put(struct nfs4_opendata *p)
 306 {
 307         if (p != NULL)
 308                 kref_put(&p->kref, nfs4_opendata_free);
 309 }
 310
 311 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 312 {
 313         sigset_t oldset;
 314         int ret;
 315
 316         rpc_clnt_sigmask(task->tk_client, &oldset);
 317         ret = rpc_wait_for_completion_task(task);
 318         rpc_clnt_sigunmask(task->tk_client, &oldset);
 319         return ret;
 320 }
 321
 322 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 323 {
 324         switch (open_flags) {
 325                 case FMODE_WRITE:
 326                         state->n_wronly++;
 327                         break;
 328                 case FMODE_READ:
 329                         state->n_rdonly++;
 330                         break;
 331                 case FMODE_READ|FMODE_WRITE:
 332                         state->n_rdwr++;
 333         }
 334 }
 335
 336 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 337 {
 338         struct inode *inode = state->inode;
 339
 340         open_flags &= (FMODE_READ|FMODE_WRITE);
 341         /* Protect against nfs4_find_state_byowner() */
 342         spin_lock(&state->owner->so_lock);
 343         spin_lock(&inode->i_lock);
 344         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 345         update_open_stateflags(state, open_flags);
 346         nfs4_state_set_mode_locked(state, state->state | open_flags);
 347         spin_unlock(&inode->i_lock);
 348         spin_unlock(&state->owner->so_lock);
 349 }
 350
 351 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 352 {
 353         struct inode *inode;
 354         struct nfs4_state *state = NULL;
 355
 356         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 357                 goto out;
 358         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 359         if (IS_ERR(inode))
 360                 goto out;
 361         state = nfs4_get_open_state(inode, data->owner);
 362         if (state == NULL)
 363                 goto put_inode;
 364         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 365         if (data->o_res.delegation_type != 0) {
 366                 struct nfs_inode *nfsi = NFS_I(inode);
 367                 int delegation_flags = 0;
 368
 369                 if (nfsi->delegation)
 370                         delegation_flags = nfsi->delegation->flags;
 371                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 372                         nfs_inode_set_delegation(state->inode,
 373                                         data->owner->so_cred,
 374                                         &data->o_res);
 375                 else
 376                         nfs_inode_reclaim_delegation(state->inode,
 377                                         data->owner->so_cred,
 378                                         &data->o_res);
 379         }
 380 put_inode:
 381         iput(inode);
 382 out:
 383         return state;
 384 }
 385
 386 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 387 {
 388         struct nfs_inode *nfsi = NFS_I(state->inode);
 389         struct nfs_open_context *ctx;
 390
 391         spin_lock(&state->inode->i_lock);
 392         list_for_each_entry(ctx, &nfsi->open_files, list) {
 393                 if (ctx->state != state)
 394                         continue;
 395                 get_nfs_open_context(ctx);
 396                 spin_unlock(&state->inode->i_lock);
 397                 return ctx;
 398         }
 399         spin_unlock(&state->inode->i_lock);
 400         return ERR_PTR(-ENOENT);
 401 }
 402
 403 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 404 {
 405         struct nfs4_state *newstate;
 406         int ret;
 407
 408         opendata->o_arg.open_flags = openflags;
 409         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 410         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 411         nfs4_init_opendata_res(opendata);
 412         ret = _nfs4_proc_open(opendata);
 413         if (ret != 0)
 414                 return ret;
 415         newstate = nfs4_opendata_to_nfs4_state(opendata);
 416         if (newstate != NULL)
 417                 nfs4_close_state(&opendata->path, newstate, openflags);
 418         *res = newstate;
 419         return 0;
 420 }
 421
 422 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 423 {
 424         struct nfs4_state *newstate;
 425         int ret;
 426
 427         /* memory barrier prior to reading state->n_* */
 428         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 429         smp_rmb();
 430         if (state->n_rdwr != 0) {
 431                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 432                 if (ret != 0)
 433                         return ret;
 434                 if (newstate != state)
 435                         return -ESTALE;
 436         }
 437         if (state->n_wronly != 0) {
 438                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 439                 if (ret != 0)
 440                         return ret;
 441                 if (newstate != state)
 442                         return -ESTALE;
 443         }
 444         if (state->n_rdonly != 0) {
 445                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 446                 if (ret != 0)
 447                         return ret;
 448                 if (newstate != state)
 449                         return -ESTALE;
 450         }
 451         return 0;
 452 }
 453
 454 /*
 455  * OPEN_RECLAIM:
 456  *      reclaim state on the server after a reboot.
 457  */
 458 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 459 {
 460         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 461         struct nfs4_opendata *opendata;
 462         int delegation_type = 0;
 463         int status;
 464
 465         if (delegation != NULL) {
 466                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 467                         memcpy(&state->stateid, &delegation->stateid,
 468                                         sizeof(state->stateid));
 469                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 470                         return 0;
 471                 }
 472                 delegation_type = delegation->type;
 473         }
 474         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 475         if (opendata == NULL)
 476                 return -ENOMEM;
 477         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 478         opendata->o_arg.fh = NFS_FH(state->inode);
 479         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 480         opendata->o_arg.u.delegation_type = delegation_type;
 481         status = nfs4_open_recover(opendata, state);
 482         nfs4_opendata_put(opendata);
 483         return status;
 484 }
 485
 486 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 487 {
 488         struct nfs_server *server = NFS_SERVER(state->inode);
 489         struct nfs4_exception exception = { };
 490         int err;
 491         do {
 492                 err = _nfs4_do_open_reclaim(ctx, state);
 493                 if (err != -NFS4ERR_DELAY)
 494                         break;
 495                 nfs4_handle_exception(server, err, &exception);
 496         } while (exception.retry);
 497         return err;
 498 }
 499
 500 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 501 {
 502         struct nfs_open_context *ctx;
 503         int ret;
 504
 505         ctx = nfs4_state_find_open_context(state);
 506         if (IS_ERR(ctx))
 507                 return PTR_ERR(ctx);
 508         ret = nfs4_do_open_reclaim(ctx, state);
 509         put_nfs_open_context(ctx);
 510         return ret;
 511 }
 512
 513 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
 514 {
 515         struct nfs4_state_owner  *sp  = state->owner;
 516         struct nfs4_opendata *opendata;
 517         int ret;
 518
 519         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 520                 return 0;
 521         opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
 522         if (opendata == NULL)
 523                 return -ENOMEM;
 524         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 525         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 526                         sizeof(opendata->o_arg.u.delegation.data));
 527         ret = nfs4_open_recover(opendata, state);
 528         nfs4_opendata_put(opendata);
 529         return ret;
 530 }
 531
 532 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
 533 {
 534         struct nfs4_exception exception = { };
 535         struct nfs_server *server = NFS_SERVER(state->inode);
 536         int err;
 537         do {
 538                 err = _nfs4_open_delegation_recall(ctx, state);
 539                 switch (err) {
 540                         case 0:
 541                                 return err;
 542                         case -NFS4ERR_STALE_CLIENTID:
 543                         case -NFS4ERR_STALE_STATEID:
 544                         case -NFS4ERR_EXPIRED:
 545                                 /* Don't recall a delegation if it was lost */
 546                                 nfs4_schedule_state_recovery(server->nfs_client);
 547                                 return err;
 548                 }
 549                 err = nfs4_handle_exception(server, err, &exception);
 550         } while (exception.retry);
 551         return err;
 552 }
 553
 554 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 555 {
 556         struct nfs4_opendata *data = calldata;
 557         struct  rpc_message msg = {
 558                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 559                 .rpc_argp = &data->c_arg,
 560                 .rpc_resp = &data->c_res,
 561                 .rpc_cred = data->owner->so_cred,
 562         };
 563         data->timestamp = jiffies;
 564         rpc_call_setup(task, &msg, 0);
 565 }
 566
 567 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 568 {
 569         struct nfs4_opendata *data = calldata;
 570
 571         data->rpc_status = task->tk_status;
 572         if (RPC_ASSASSINATED(task))
 573                 return;
 574         if (data->rpc_status == 0) {
 575                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 576                                 sizeof(data->o_res.stateid.data));
 577                 renew_lease(data->o_res.server, data->timestamp);
 578         }
 579         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 580         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 581 }
 582
 583 static void nfs4_open_confirm_release(void *calldata)
 584 {
 585         struct nfs4_opendata *data = calldata;
 586         struct nfs4_state *state = NULL;
 587
 588         /* If this request hasn't been cancelled, do nothing */
 589         if (data->cancelled == 0)
 590                 goto out_free;
 591         /* In case of error, no cleanup! */
 592         if (data->rpc_status != 0)
 593                 goto out_free;
 594         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 595         state = nfs4_opendata_to_nfs4_state(data);
 596         if (state != NULL)
 597                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 598 out_free:
 599         nfs4_opendata_put(data);
 600 }
 601
 602 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 603         .rpc_call_prepare = nfs4_open_confirm_prepare,
 604         .rpc_call_done = nfs4_open_confirm_done,
 605         .rpc_release = nfs4_open_confirm_release,
 606 };
 607
 608 /*
 609  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 610  */
 611 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 612 {
 613         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 614         struct rpc_task *task;
 615         int status;
 616
 617         kref_get(&data->kref);
 618         /*
 619          * If rpc_run_task() ends up calling ->rpc_release(), we
 620          * want to ensure that it takes the 'error' code path.
 621          */
 622         data->rpc_status = -ENOMEM;
 623         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 624         if (IS_ERR(task))
 625                 return PTR_ERR(task);
 626         status = nfs4_wait_for_completion_rpc_task(task);
 627         if (status != 0) {
 628                 data->cancelled = 1;
 629                 smp_wmb();
 630         } else
 631                 status = data->rpc_status;
 632         rpc_put_task(task);
 633         return status;
 634 }
 635
 636 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 637 {
 638         struct nfs4_opendata *data = calldata;
 639         struct nfs4_state_owner *sp = data->owner;
 640         struct rpc_message msg = {
 641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 642                 .rpc_argp = &data->o_arg,
 643                 .rpc_resp = &data->o_res,
 644                 .rpc_cred = sp->so_cred,
 645         };
 646
 647         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 648                 return;
 649         /* Update sequence id. */
 650         data->o_arg.id = sp->so_owner_id.id;
 651         data->o_arg.clientid = sp->so_client->cl_clientid;
 652         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 653                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 654         data->timestamp = jiffies;
 655         rpc_call_setup(task, &msg, 0);
 656 }
 657
 658 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 659 {
 660         struct nfs4_opendata *data = calldata;
 661
 662         data->rpc_status = task->tk_status;
 663         if (RPC_ASSASSINATED(task))
 664                 return;
 665         if (task->tk_status == 0) {
 666                 switch (data->o_res.f_attr->mode & S_IFMT) {
 667                         case S_IFREG:
 668                                 break;
 669                         case S_IFLNK:
 670                                 data->rpc_status = -ELOOP;
 671                                 break;
 672                         case S_IFDIR:
 673                                 data->rpc_status = -EISDIR;
 674                                 break;
 675                         default:
 676                                 data->rpc_status = -ENOTDIR;
 677                 }
 678                 renew_lease(data->o_res.server, data->timestamp);
 679         }
 680         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 681 }
 682
 683 static void nfs4_open_release(void *calldata)
 684 {
 685         struct nfs4_opendata *data = calldata;
 686         struct nfs4_state *state = NULL;
 687
 688         /* If this request hasn't been cancelled, do nothing */
 689         if (data->cancelled == 0)
 690                 goto out_free;
 691         /* In case of error, no cleanup! */
 692         if (data->rpc_status != 0)
 693                 goto out_free;
 694         /* In case we need an open_confirm, no cleanup! */
 695         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 696                 goto out_free;
 697         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 698         state = nfs4_opendata_to_nfs4_state(data);
 699         if (state != NULL)
 700                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 701 out_free:
 702         nfs4_opendata_put(data);
 703 }
 704
 705 static const struct rpc_call_ops nfs4_open_ops = {
 706         .rpc_call_prepare = nfs4_open_prepare,
 707         .rpc_call_done = nfs4_open_done,
 708         .rpc_release = nfs4_open_release,
 709 };
 710
 711 /*
 712  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 713  */
 714 static int _nfs4_proc_open(struct nfs4_opendata *data)
 715 {
 716         struct inode *dir = data->dir->d_inode;
 717         struct nfs_server *server = NFS_SERVER(dir);
 718         struct nfs_openargs *o_arg = &data->o_arg;
 719         struct nfs_openres *o_res = &data->o_res;
 720         struct rpc_task *task;
 721         int status;
 722
 723         kref_get(&data->kref);
 724         /*
 725          * If rpc_run_task() ends up calling ->rpc_release(), we
 726          * want to ensure that it takes the 'error' code path.
 727          */
 728         data->rpc_status = -ENOMEM;
 729         data->cancelled = 0;
 730         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 731         if (IS_ERR(task))
 732                 return PTR_ERR(task);
 733         status = nfs4_wait_for_completion_rpc_task(task);
 734         if (status != 0) {
 735                 data->cancelled = 1;
 736                 smp_wmb();
 737         } else
 738                 status = data->rpc_status;
 739         rpc_put_task(task);
 740         if (status != 0)
 741                 return status;
 742
 743         if (o_arg->open_flags & O_CREAT) {
 744                 update_changeattr(dir, &o_res->cinfo);
 745                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 746         } else
 747                 nfs_refresh_inode(dir, o_res->dir_attr);
 748         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 749                 status = _nfs4_proc_open_confirm(data);
 750                 if (status != 0)
 751                         return status;
 752         }
 753         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 754         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 755                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 756         return 0;
 757 }
 758
 759 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 760 {
 761         struct nfs_access_entry cache;
 762         int mask = 0;
 763         int status;
 764
 765         if (openflags & FMODE_READ)
 766                 mask |= MAY_READ;
 767         if (openflags & FMODE_WRITE)
 768                 mask |= MAY_WRITE;
 769         if (openflags & FMODE_EXEC)
 770                 mask |= MAY_EXEC;
 771         status = nfs_access_get_cached(inode, cred, &cache);
 772         if (status == 0)
 773                 goto out;
 774
 775         /* Be clever: ask server to check for all possible rights */
 776         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 777         cache.cred = cred;
 778         cache.jiffies = jiffies;
 779         status = _nfs4_proc_access(inode, &cache);
 780         if (status != 0)
 781                 return status;
 782         nfs_access_add_cache(inode, &cache);
 783 out:
 784         if ((cache.mask & mask) == mask)
 785                 return 0;
 786         return -EACCES;
 787 }
 788
 789 static int nfs4_recover_expired_lease(struct nfs_server *server)
 790 {
 791         struct nfs_client *clp = server->nfs_client;
 792         int ret;
 793
 794         for (;;) {
 795                 ret = nfs4_wait_clnt_recover(server->client, clp);
 796                 if (ret != 0)
 797                         return ret;
 798                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 799                         break;
 800                 nfs4_schedule_state_recovery(clp);
 801         }
 802         return 0;
 803 }
 804
 805 /*
 806  * OPEN_EXPIRED:
 807  *      reclaim state on the server after a network partition.
 808  *      Assumes caller holds the appropriate lock
 809  */
 810 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 811 {
 812         struct inode *inode = state->inode;
 813         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 814         struct nfs4_opendata *opendata;
 815         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 816         int ret;
 817
 818         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 819                 ret = _nfs4_do_access(inode, ctx->cred, openflags);
 820                 if (ret < 0)
 821                         return ret;
 822                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 823                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 824                 return 0;
 825         }
 826         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, openflags, NULL);
 827         if (opendata == NULL)
 828                 return -ENOMEM;
 829         ret = nfs4_open_recover(opendata, state);
 830         if (ret == -ESTALE) {
 831                 /* Invalidate the state owner so we don't ever use it again */
 832                 nfs4_drop_state_owner(state->owner);
 833                 d_drop(ctx->path.dentry);
 834         }
 835         nfs4_opendata_put(opendata);
 836         return ret;
 837 }
 838
 839 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 840 {
 841         struct nfs_server *server = NFS_SERVER(state->inode);
 842         struct nfs4_exception exception = { };
 843         int err;
 844
 845         do {
 846                 err = _nfs4_open_expired(ctx, state);
 847                 if (err == -NFS4ERR_DELAY)
 848                         nfs4_handle_exception(server, err, &exception);
 849         } while (exception.retry);
 850         return err;
 851 }
 852
 853 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 854 {
 855         struct nfs_open_context *ctx;
 856         int ret;
 857
 858         ctx = nfs4_state_find_open_context(state);
 859         if (IS_ERR(ctx))
 860                 return PTR_ERR(ctx);
 861         ret = nfs4_do_open_expired(ctx, state);
 862         put_nfs_open_context(ctx);
 863         return ret;
 864 }
 865
 866 /*
 867  * Returns a referenced nfs4_state if there is an open delegation on the file
 868  */
 869 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 870 {
 871         struct nfs_delegation *delegation;
 872         struct nfs_server *server = NFS_SERVER(inode);
 873         struct nfs_client *clp = server->nfs_client;
 874         struct nfs_inode *nfsi = NFS_I(inode);
 875         struct nfs4_state_owner *sp = NULL;
 876         struct nfs4_state *state = NULL;
 877         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 878         int err;
 879
 880         err = -ENOMEM;
 881         if (!(sp = nfs4_get_state_owner(server, cred))) {
 882                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 883                 return err;
 884         }
 885         err = nfs4_recover_expired_lease(server);
 886         if (err != 0)
 887                 goto out_put_state_owner;
 888         /* Protect against reboot recovery - NOTE ORDER! */
 889         down_read(&clp->cl_sem);
 890         /* Protect against delegation recall */
 891         down_read(&nfsi->rwsem);
 892         delegation = NFS_I(inode)->delegation;
 893         err = -ENOENT;
 894         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 895                 goto out_err;
 896         err = -ENOMEM;
 897         state = nfs4_get_open_state(inode, sp);
 898         if (state == NULL)
 899                 goto out_err;
 900
 901         err = -ENOENT;
 902         if ((state->state & open_flags) == open_flags) {
 903                 spin_lock(&inode->i_lock);
 904                 update_open_stateflags(state, open_flags);
 905                 spin_unlock(&inode->i_lock);
 906                 goto out_ok;
 907         } else if (state->state != 0)
 908                 goto out_put_open_state;
 909
 910         lock_kernel();
 911         err = _nfs4_do_access(inode, cred, open_flags);
 912         unlock_kernel();
 913         if (err != 0)
 914                 goto out_put_open_state;
 915         set_bit(NFS_DELEGATED_STATE, &state->flags);
 916         update_open_stateid(state, &delegation->stateid, open_flags);
 917 out_ok:
 918         nfs4_put_state_owner(sp);
 919         up_read(&nfsi->rwsem);
 920         up_read(&clp->cl_sem);
 921         *res = state;
 922         return 0;
 923 out_put_open_state:
 924         nfs4_put_open_state(state);
 925 out_err:
 926         up_read(&nfsi->rwsem);
 927         up_read(&clp->cl_sem);
 928         if (err != -EACCES)
 929                 nfs_inode_return_delegation(inode);
 930 out_put_state_owner:
 931         nfs4_put_state_owner(sp);
 932         return err;
 933 }
 934
 935 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 936 {
 937         struct nfs4_exception exception = { };
 938         struct nfs4_state *res = ERR_PTR(-EIO);
 939         int err;
 940
 941         do {
 942                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 943                 if (err == 0)
 944                         break;
 945                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 946                                         err, &exception));
 947         } while (exception.retry);
 948         return res;
 949 }
 950
 951 /*
 952  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
 953  * fields corresponding to attributes that were used to store the verifier.
 954  * Make sure we clobber those fields in the later setattr call
 955  */
 956 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
 957 {
 958         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
 959             !(sattr->ia_valid & ATTR_ATIME_SET))
 960                 sattr->ia_valid |= ATTR_ATIME;
 961
 962         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
 963             !(sattr->ia_valid & ATTR_MTIME_SET))
 964                 sattr->ia_valid |= ATTR_MTIME;
 965 }
 966
 967 /*
 968  * Returns a referenced nfs4_state
 969  */
 970 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 971 {
 972         struct nfs4_state_owner  *sp;
 973         struct nfs4_state     *state = NULL;
 974         struct nfs_server       *server = NFS_SERVER(dir);
 975         struct nfs_client *clp = server->nfs_client;
 976         struct nfs4_opendata *opendata;
 977         int                     status;
 978
 979         /* Protect against reboot recovery conflicts */
 980         status = -ENOMEM;
 981         if (!(sp = nfs4_get_state_owner(server, cred))) {
 982                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 983                 goto out_err;
 984         }
 985         status = nfs4_recover_expired_lease(server);
 986         if (status != 0)
 987                 goto err_put_state_owner;
 988         down_read(&clp->cl_sem);
 989         status = -ENOMEM;
 990         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
 991         if (opendata == NULL)
 992                 goto err_release_rwsem;
 993
 994         status = _nfs4_proc_open(opendata);
 995         if (status != 0)
 996                 goto err_opendata_put;
 997
 998         if (opendata->o_arg.open_flags & O_EXCL)
 999                 nfs4_exclusive_attrset(opendata, sattr);
1000
1001         status = -ENOMEM;
1002         state = nfs4_opendata_to_nfs4_state(opendata);
1003         if (state == NULL)
1004                 goto err_opendata_put;
1005         nfs4_opendata_put(opendata);
1006         nfs4_put_state_owner(sp);
1007         up_read(&clp->cl_sem);
1008         *res = state;
1009         return 0;
1010 err_opendata_put:
1011         nfs4_opendata_put(opendata);
1012 err_release_rwsem:
1013         up_read(&clp->cl_sem);
1014 err_put_state_owner:
1015         nfs4_put_state_owner(sp);
1016 out_err:
1017         *res = NULL;
1018         return status;
1019 }
1020
1021
1022 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1023 {
1024         struct nfs4_exception exception = { };
1025         struct nfs4_state *res;
1026         int status;
1027
1028         do {
1029                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1030                 if (status == 0)
1031                         break;
1032                 /* NOTE: BAD_SEQID means the server and client disagree about the
1033                  * book-keeping w.r.t. state-changing operations
1034                  * (OPEN/CLOSE/LOCK/LOCKU...)
1035                  * It is actually a sign of a bug on the client or on the server.
1036                  *
1037                  * If we receive a BAD_SEQID error in the particular case of
1038                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1039                  * have unhashed the old state_owner for us, and that we can
1040                  * therefore safely retry using a new one. We should still warn
1041                  * the user though...
1042                  */
1043                 if (status == -NFS4ERR_BAD_SEQID) {
1044                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1045                         exception.retry = 1;
1046                         continue;
1047                 }
1048                 /*
1049                  * BAD_STATEID on OPEN means that the server cancelled our
1050                  * state before it received the OPEN_CONFIRM.
1051                  * Recover by retrying the request as per the discussion
1052                  * on Page 181 of RFC3530.
1053                  */
1054                 if (status == -NFS4ERR_BAD_STATEID) {
1055                         exception.retry = 1;
1056                         continue;
1057                 }
1058                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1059                                         status, &exception));
1060         } while (exception.retry);
1061         return res;
1062 }
1063
1064 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1065                 struct iattr *sattr, struct nfs4_state *state)
1066 {
1067         struct nfs_server *server = NFS_SERVER(inode);
1068         struct nfs_setattrargs  arg = {
1069                 .fh             = NFS_FH(inode),
1070                 .iap            = sattr,
1071                 .server         = server,
1072                 .bitmask = server->attr_bitmask,
1073         };
1074         struct nfs_setattrres  res = {
1075                 .fattr          = fattr,
1076                 .server         = server,
1077         };
1078         struct rpc_message msg = {
1079                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1080                 .rpc_argp       = &arg,
1081                 .rpc_resp       = &res,
1082         };
1083         unsigned long timestamp = jiffies;
1084         int status;
1085
1086         nfs_fattr_init(fattr);
1087
1088         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1089                 /* Use that stateid */
1090         } else if (state != NULL) {
1091                 msg.rpc_cred = state->owner->so_cred;
1092                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1093         } else
1094                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1095
1096         status = rpc_call_sync(server->client, &msg, 0);
1097         if (status == 0 && state != NULL)
1098                 renew_lease(server, timestamp);
1099         return status;
1100 }
1101
1102 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1103                 struct iattr *sattr, struct nfs4_state *state)
1104 {
1105         struct nfs_server *server = NFS_SERVER(inode);
1106         struct nfs4_exception exception = { };
1107         int err;
1108         do {
1109                 err = nfs4_handle_exception(server,
1110                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1111                                 &exception);
1112         } while (exception.retry);
1113         return err;
1114 }
1115
1116 struct nfs4_closedata {
1117         struct path path;
1118         struct inode *inode;
1119         struct nfs4_state *state;
1120         struct nfs_closeargs arg;
1121         struct nfs_closeres res;
1122         struct nfs_fattr fattr;
1123         unsigned long timestamp;
1124 };
1125
1126 static void nfs4_free_closedata(void *data)
1127 {
1128         struct nfs4_closedata *calldata = data;
1129         struct nfs4_state_owner *sp = calldata->state->owner;
1130
1131         nfs4_put_open_state(calldata->state);
1132         nfs_free_seqid(calldata->arg.seqid);
1133         nfs4_put_state_owner(sp);
1134         dput(calldata->path.dentry);
1135         mntput(calldata->path.mnt);
1136         kfree(calldata);
1137 }
1138
1139 static void nfs4_close_done(struct rpc_task *task, void *data)
1140 {
1141         struct nfs4_closedata *calldata = data;
1142         struct nfs4_state *state = calldata->state;
1143         struct nfs_server *server = NFS_SERVER(calldata->inode);
1144
1145         if (RPC_ASSASSINATED(task))
1146                 return;
1147         /* hmm. we are done with the inode, and in the process of freeing
1148          * the state_owner. we keep this around to process errors
1149          */
1150         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1151         switch (task->tk_status) {
1152                 case 0:
1153                         memcpy(&state->stateid, &calldata->res.stateid,
1154                                         sizeof(state->stateid));
1155                         renew_lease(server, calldata->timestamp);
1156                         break;
1157                 case -NFS4ERR_STALE_STATEID:
1158                 case -NFS4ERR_EXPIRED:
1159                         break;
1160                 default:
1161                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1162                                 rpc_restart_call(task);
1163                                 return;
1164                         }
1165         }
1166         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1167 }
1168
1169 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1170 {
1171         struct nfs4_closedata *calldata = data;
1172         struct nfs4_state *state = calldata->state;
1173         struct rpc_message msg = {
1174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1175                 .rpc_argp = &calldata->arg,
1176                 .rpc_resp = &calldata->res,
1177                 .rpc_cred = state->owner->so_cred,
1178         };
1179         int mode = 0, old_mode;
1180
1181         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1182                 return;
1183         /* Recalculate the new open mode in case someone reopened the file
1184          * while we were waiting in line to be scheduled.
1185          */
1186         spin_lock(&state->owner->so_lock);
1187         spin_lock(&calldata->inode->i_lock);
1188         mode = old_mode = state->state;
1189         if (state->n_rdwr == 0) {
1190                 if (state->n_rdonly == 0)
1191                         mode &= ~FMODE_READ;
1192                 if (state->n_wronly == 0)
1193                         mode &= ~FMODE_WRITE;
1194         }
1195         nfs4_state_set_mode_locked(state, mode);
1196         spin_unlock(&calldata->inode->i_lock);
1197         spin_unlock(&state->owner->so_lock);
1198         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1199                 /* Note: exit _without_ calling nfs4_close_done */
1200                 task->tk_action = NULL;
1201                 return;
1202         }
1203         nfs_fattr_init(calldata->res.fattr);
1204         if (mode != 0)
1205                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1206         calldata->arg.open_flags = mode;
1207         calldata->timestamp = jiffies;
1208         rpc_call_setup(task, &msg, 0);
1209 }
1210
1211 static const struct rpc_call_ops nfs4_close_ops = {
1212         .rpc_call_prepare = nfs4_close_prepare,
1213         .rpc_call_done = nfs4_close_done,
1214         .rpc_release = nfs4_free_closedata,
1215 };
1216
1217 /*
1218  * It is possible for data to be read/written from a mem-mapped file
1219  * after the sys_close call (which hits the vfs layer as a flush).
1220  * This means that we can't safely call nfsv4 close on a file until
1221  * the inode is cleared. This in turn means that we are not good
1222  * NFSv4 citizens - we do not indicate to the server to update the file's
1223  * share state even when we are done with one of the three share
1224  * stateid's in the inode.
1225  *
1226  * NOTE: Caller must be holding the sp->so_owner semaphore!
1227  */
1228 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1229 {
1230         struct nfs_server *server = NFS_SERVER(state->inode);
1231         struct nfs4_closedata *calldata;
1232         struct nfs4_state_owner *sp = state->owner;
1233         struct rpc_task *task;
1234         int status = -ENOMEM;
1235
1236         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1237         if (calldata == NULL)
1238                 goto out;
1239         calldata->inode = state->inode;
1240         calldata->state = state;
1241         calldata->arg.fh = NFS_FH(state->inode);
1242         calldata->arg.stateid = &state->stateid;
1243         /* Serialization for the sequence id */
1244         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1245         if (calldata->arg.seqid == NULL)
1246                 goto out_free_calldata;
1247         calldata->arg.bitmask = server->attr_bitmask;
1248         calldata->res.fattr = &calldata->fattr;
1249         calldata->res.server = server;
1250         calldata->path.mnt = mntget(path->mnt);
1251         calldata->path.dentry = dget(path->dentry);
1252
1253         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1254         if (IS_ERR(task))
1255                 return PTR_ERR(task);
1256         rpc_put_task(task);
1257         return 0;
1258 out_free_calldata:
1259         kfree(calldata);
1260 out:
1261         nfs4_put_open_state(state);
1262         nfs4_put_state_owner(sp);
1263         return status;
1264 }
1265
1266 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1267 {
1268         struct file *filp;
1269         int ret;
1270
1271         /* If the open_intent is for execute, we have an extra check to make */
1272         if (nd->intent.open.flags & FMODE_EXEC) {
1273                 ret = _nfs4_do_access(state->inode,
1274                                 state->owner->so_cred,
1275                                 nd->intent.open.flags);
1276                 if (ret < 0)
1277                         goto out_close;
1278         }
1279         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1280         if (!IS_ERR(filp)) {
1281                 struct nfs_open_context *ctx;
1282                 ctx = (struct nfs_open_context *)filp->private_data;
1283                 ctx->state = state;
1284                 return 0;
1285         }
1286         ret = PTR_ERR(filp);
1287 out_close:
1288         nfs4_close_state(path, state, nd->intent.open.flags);
1289         return ret;
1290 }
1291
1292 struct dentry *
1293 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1294 {
1295         struct path path = {
1296                 .mnt = nd->mnt,
1297                 .dentry = dentry,
1298         };
1299         struct iattr attr;
1300         struct rpc_cred *cred;
1301         struct nfs4_state *state;
1302         struct dentry *res;
1303
1304         if (nd->flags & LOOKUP_CREATE) {
1305                 attr.ia_mode = nd->intent.open.create_mode;
1306                 attr.ia_valid = ATTR_MODE;
1307                 if (!IS_POSIXACL(dir))
1308                         attr.ia_mode &= ~current->fs->umask;
1309         } else {
1310                 attr.ia_valid = 0;
1311                 BUG_ON(nd->intent.open.flags & O_CREAT);
1312         }
1313
1314         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1315         if (IS_ERR(cred))
1316                 return (struct dentry *)cred;
1317         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1318         put_rpccred(cred);
1319         if (IS_ERR(state)) {
1320                 if (PTR_ERR(state) == -ENOENT)
1321                         d_add(dentry, NULL);
1322                 return (struct dentry *)state;
1323         }
1324         res = d_add_unique(dentry, igrab(state->inode));
1325         if (res != NULL)
1326                 dentry = res;
1327         nfs4_intent_set_file(nd, &path, state);
1328         return res;
1329 }
1330
1331 int
1332 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1333 {
1334         struct path path = {
1335                 .mnt = nd->mnt,
1336                 .dentry = dentry,
1337         };
1338         struct rpc_cred *cred;
1339         struct nfs4_state *state;
1340
1341         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1342         if (IS_ERR(cred))
1343                 return PTR_ERR(cred);
1344         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1345         if (IS_ERR(state))
1346                 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1347         put_rpccred(cred);
1348         if (IS_ERR(state)) {
1349                 switch (PTR_ERR(state)) {
1350                         case -EPERM:
1351                         case -EACCES:
1352                         case -EDQUOT:
1353                         case -ENOSPC:
1354                         case -EROFS:
1355                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1356                                 return 1;
1357                         default:
1358                                 goto out_drop;
1359                 }
1360         }
1361         if (state->inode == dentry->d_inode) {
1362                 nfs4_intent_set_file(nd, &path, state);
1363                 return 1;
1364         }
1365         nfs4_close_state(&path, state, openflags);
1366 out_drop:
1367         d_drop(dentry);
1368         return 0;
1369 }
1370
1371
1372 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1373 {
1374         struct nfs4_server_caps_res res = {};
1375         struct rpc_message msg = {
1376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1377                 .rpc_argp = fhandle,
1378                 .rpc_resp = &res,
1379         };
1380         int status;
1381
1382         status = rpc_call_sync(server->client, &msg, 0);
1383         if (status == 0) {
1384                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1385                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1386                         server->caps |= NFS_CAP_ACLS;
1387                 if (res.has_links != 0)
1388                         server->caps |= NFS_CAP_HARDLINKS;
1389                 if (res.has_symlinks != 0)
1390                         server->caps |= NFS_CAP_SYMLINKS;
1391                 server->acl_bitmask = res.acl_bitmask;
1392         }
1393         return status;
1394 }
1395
1396 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1397 {
1398         struct nfs4_exception exception = { };
1399         int err;
1400         do {
1401                 err = nfs4_handle_exception(server,
1402                                 _nfs4_server_capabilities(server, fhandle),
1403                                 &exception);
1404         } while (exception.retry);
1405         return err;
1406 }
1407
1408 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1409                 struct nfs_fsinfo *info)
1410 {
1411         struct nfs4_lookup_root_arg args = {
1412                 .bitmask = nfs4_fattr_bitmap,
1413         };
1414         struct nfs4_lookup_res res = {
1415                 .server = server,
1416                 .fattr = info->fattr,
1417                 .fh = fhandle,
1418         };
1419         struct rpc_message msg = {
1420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1421                 .rpc_argp = &args,
1422                 .rpc_resp = &res,
1423         };
1424         nfs_fattr_init(info->fattr);
1425         return rpc_call_sync(server->client, &msg, 0);
1426 }
1427
1428 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1429                 struct nfs_fsinfo *info)
1430 {
1431         struct nfs4_exception exception = { };
1432         int err;
1433         do {
1434                 err = nfs4_handle_exception(server,
1435                                 _nfs4_lookup_root(server, fhandle, info),
1436                                 &exception);
1437         } while (exception.retry);
1438         return err;
1439 }
1440
1441 /*
1442  * get the file handle for the "/" directory on the server
1443  */
1444 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1445                               struct nfs_fsinfo *info)
1446 {
1447         int status;
1448
1449         status = nfs4_lookup_root(server, fhandle, info);
1450         if (status == 0)
1451                 status = nfs4_server_capabilities(server, fhandle);
1452         if (status == 0)
1453                 status = nfs4_do_fsinfo(server, fhandle, info);
1454         return nfs4_map_errors(status);
1455 }
1456
1457 /*
1458  * Get locations and (maybe) other attributes of a referral.
1459  * Note that we'll actually follow the referral later when
1460  * we detect fsid mismatch in inode revalidation
1461  */
1462 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1463 {
1464         int status = -ENOMEM;
1465         struct page *page = NULL;
1466         struct nfs4_fs_locations *locations = NULL;
1467
1468         page = alloc_page(GFP_KERNEL);
1469         if (page == NULL)
1470                 goto out;
1471         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1472         if (locations == NULL)
1473                 goto out;
1474
1475         status = nfs4_proc_fs_locations(dir, name, locations, page);
1476         if (status != 0)
1477                 goto out;
1478         /* Make sure server returned a different fsid for the referral */
1479         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1480                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1481                 status = -EIO;
1482                 goto out;
1483         }
1484
1485         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1486         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1487         if (!fattr->mode)
1488                 fattr->mode = S_IFDIR;
1489         memset(fhandle, 0, sizeof(struct nfs_fh));
1490 out:
1491         if (page)
1492                 __free_page(page);
1493         if (locations)
1494                 kfree(locations);
1495         return status;
1496 }
1497
1498 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1499 {
1500         struct nfs4_getattr_arg args = {
1501                 .fh = fhandle,
1502                 .bitmask = server->attr_bitmask,
1503         };
1504         struct nfs4_getattr_res res = {
1505                 .fattr = fattr,
1506                 .server = server,
1507         };
1508         struct rpc_message msg = {
1509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1510                 .rpc_argp = &args,
1511                 .rpc_resp = &res,
1512         };
1513
1514         nfs_fattr_init(fattr);
1515         return rpc_call_sync(server->client, &msg, 0);
1516 }
1517
1518 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1519 {
1520         struct nfs4_exception exception = { };
1521         int err;
1522         do {
1523                 err = nfs4_handle_exception(server,
1524                                 _nfs4_proc_getattr(server, fhandle, fattr),
1525                                 &exception);
1526         } while (exception.retry);
1527         return err;
1528 }
1529
1530 /*
1531  * The file is not closed if it is opened due to the a request to change
1532  * the size of the file. The open call will not be needed once the
1533  * VFS layer lookup-intents are implemented.
1534  *
1535  * Close is called when the inode is destroyed.
1536  * If we haven't opened the file for O_WRONLY, we
1537  * need to in the size_change case to obtain a stateid.
1538  *
1539  * Got race?
1540  * Because OPEN is always done by name in nfsv4, it is
1541  * possible that we opened a different file by the same
1542  * name.  We can recognize this race condition, but we
1543  * can't do anything about it besides returning an error.
1544  *
1545  * This will be fixed with VFS changes (lookup-intent).
1546  */
1547 static int
1548 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1549                   struct iattr *sattr)
1550 {
1551         struct rpc_cred *cred;
1552         struct inode *inode = dentry->d_inode;
1553         struct nfs_open_context *ctx;
1554         struct nfs4_state *state = NULL;
1555         int status;
1556
1557         nfs_fattr_init(fattr);
1558
1559         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1560         if (IS_ERR(cred))
1561                 return PTR_ERR(cred);
1562
1563         /* Search for an existing open(O_WRITE) file */
1564         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1565         if (ctx != NULL)
1566                 state = ctx->state;
1567
1568         status = nfs4_do_setattr(inode, fattr, sattr, state);
1569         if (status == 0)
1570                 nfs_setattr_update_inode(inode, sattr);
1571         if (ctx != NULL)
1572                 put_nfs_open_context(ctx);
1573         put_rpccred(cred);
1574         return status;
1575 }
1576
1577 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1578                 struct qstr *name, struct nfs_fh *fhandle,
1579                 struct nfs_fattr *fattr)
1580 {
1581         int                    status;
1582         struct nfs4_lookup_arg args = {
1583                 .bitmask = server->attr_bitmask,
1584                 .dir_fh = dirfh,
1585                 .name = name,
1586         };
1587         struct nfs4_lookup_res res = {
1588                 .server = server,
1589                 .fattr = fattr,
1590                 .fh = fhandle,
1591         };
1592         struct rpc_message msg = {
1593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1594                 .rpc_argp = &args,
1595                 .rpc_resp = &res,
1596         };
1597
1598         nfs_fattr_init(fattr);
1599
1600         dprintk("NFS call  lookupfh %s\n", name->name);
1601         status = rpc_call_sync(server->client, &msg, 0);
1602         dprintk("NFS reply lookupfh: %d\n", status);
1603         return status;
1604 }
1605
1606 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1607                               struct qstr *name, struct nfs_fh *fhandle,
1608                               struct nfs_fattr *fattr)
1609 {
1610         struct nfs4_exception exception = { };
1611         int err;
1612         do {
1613                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1614                 /* FIXME: !!!! */
1615                 if (err == -NFS4ERR_MOVED) {
1616                         err = -EREMOTE;
1617                         break;
1618                 }
1619                 err = nfs4_handle_exception(server, err, &exception);
1620         } while (exception.retry);
1621         return err;
1622 }
1623
1624 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1625                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1626 {
1627         int status;
1628
1629         dprintk("NFS call  lookup %s\n", name->name);
1630         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1631         if (status == -NFS4ERR_MOVED)
1632                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1633         dprintk("NFS reply lookup: %d\n", status);
1634         return status;
1635 }
1636
1637 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1638 {
1639         struct nfs4_exception exception = { };
1640         int err;
1641         do {
1642                 err = nfs4_handle_exception(NFS_SERVER(dir),
1643                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1644                                 &exception);
1645         } while (exception.retry);
1646         return err;
1647 }
1648
1649 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1650 {
1651         struct nfs4_accessargs args = {
1652                 .fh = NFS_FH(inode),
1653         };
1654         struct nfs4_accessres res = { 0 };
1655         struct rpc_message msg = {
1656                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1657                 .rpc_argp = &args,
1658                 .rpc_resp = &res,
1659                 .rpc_cred = entry->cred,
1660         };
1661         int mode = entry->mask;
1662         int status;
1663
1664         /*
1665          * Determine which access bits we want to ask for...
1666          */
1667         if (mode & MAY_READ)
1668                 args.access |= NFS4_ACCESS_READ;
1669         if (S_ISDIR(inode->i_mode)) {
1670                 if (mode & MAY_WRITE)
1671                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1672                 if (mode & MAY_EXEC)
1673                         args.access |= NFS4_ACCESS_LOOKUP;
1674         } else {
1675                 if (mode & MAY_WRITE)
1676                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1677                 if (mode & MAY_EXEC)
1678                         args.access |= NFS4_ACCESS_EXECUTE;
1679         }
1680         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1681         if (!status) {
1682                 entry->mask = 0;
1683                 if (res.access & NFS4_ACCESS_READ)
1684                         entry->mask |= MAY_READ;
1685                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1686                         entry->mask |= MAY_WRITE;
1687                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1688                         entry->mask |= MAY_EXEC;
1689         }
1690         return status;
1691 }
1692
1693 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1694 {
1695         struct nfs4_exception exception = { };
1696         int err;
1697         do {
1698                 err = nfs4_handle_exception(NFS_SERVER(inode),
1699                                 _nfs4_proc_access(inode, entry),
1700                                 &exception);
1701         } while (exception.retry);
1702         return err;
1703 }
1704
1705 /*
1706  * TODO: For the time being, we don't try to get any attributes
1707  * along with any of the zero-copy operations READ, READDIR,
1708  * READLINK, WRITE.
1709  *
1710  * In the case of the first three, we want to put the GETATTR
1711  * after the read-type operation -- this is because it is hard
1712  * to predict the length of a GETATTR response in v4, and thus
1713  * align the READ data correctly.  This means that the GETATTR
1714  * may end up partially falling into the page cache, and we should
1715  * shift it into the 'tail' of the xdr_buf before processing.
1716  * To do this efficiently, we need to know the total length
1717  * of data received, which doesn't seem to be available outside
1718  * of the RPC layer.
1719  *
1720  * In the case of WRITE, we also want to put the GETATTR after
1721  * the operation -- in this case because we want to make sure
1722  * we get the post-operation mtime and size.  This means that
1723  * we can't use xdr_encode_pages() as written: we need a variant
1724  * of it which would leave room in the 'tail' iovec.
1725  *
1726  * Both of these changes to the XDR layer would in fact be quite
1727  * minor, but I decided to leave them for a subsequent patch.
1728  */
1729 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1730                 unsigned int pgbase, unsigned int pglen)
1731 {
1732         struct nfs4_readlink args = {
1733                 .fh       = NFS_FH(inode),
1734                 .pgbase   = pgbase,
1735                 .pglen    = pglen,
1736                 .pages    = &page,
1737         };
1738         struct rpc_message msg = {
1739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1740                 .rpc_argp = &args,
1741                 .rpc_resp = NULL,
1742         };
1743
1744         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1745 }
1746
1747 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1748                 unsigned int pgbase, unsigned int pglen)
1749 {
1750         struct nfs4_exception exception = { };
1751         int err;
1752         do {
1753                 err = nfs4_handle_exception(NFS_SERVER(inode),
1754                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1755                                 &exception);
1756         } while (exception.retry);
1757         return err;
1758 }
1759
1760 /*
1761  * Got race?
1762  * We will need to arrange for the VFS layer to provide an atomic open.
1763  * Until then, this create/open method is prone to inefficiency and race
1764  * conditions due to the lookup, create, and open VFS calls from sys_open()
1765  * placed on the wire.
1766  *
1767  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1768  * The file will be opened again in the subsequent VFS open call
1769  * (nfs4_proc_file_open).
1770  *
1771  * The open for read will just hang around to be used by any process that
1772  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1773  */
1774
1775 static int
1776 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1777                  int flags, struct nameidata *nd)
1778 {
1779         struct path path = {
1780                 .mnt = nd->mnt,
1781                 .dentry = dentry,
1782         };
1783         struct nfs4_state *state;
1784         struct rpc_cred *cred;
1785         int status = 0;
1786
1787         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1788         if (IS_ERR(cred)) {
1789                 status = PTR_ERR(cred);
1790                 goto out;
1791         }
1792         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1793         put_rpccred(cred);
1794         if (IS_ERR(state)) {
1795                 status = PTR_ERR(state);
1796                 goto out;
1797         }
1798         d_instantiate(dentry, igrab(state->inode));
1799         if (flags & O_EXCL) {
1800                 struct nfs_fattr fattr;
1801                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1802                 if (status == 0)
1803                         nfs_setattr_update_inode(state->inode, sattr);
1804                 nfs_post_op_update_inode(state->inode, &fattr);
1805         }
1806         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1807                 status = nfs4_intent_set_file(nd, &path, state);
1808         else
1809                 nfs4_close_state(&path, state, flags);
1810 out:
1811         return status;
1812 }
1813
1814 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1815 {
1816         struct nfs_server *server = NFS_SERVER(dir);
1817         struct nfs4_remove_arg args = {
1818                 .fh = NFS_FH(dir),
1819                 .name = name,
1820                 .bitmask = server->attr_bitmask,
1821         };
1822         struct nfs_fattr dir_attr;
1823         struct nfs4_remove_res  res = {
1824                 .server = server,
1825                 .dir_attr = &dir_attr,
1826         };
1827         struct rpc_message msg = {
1828                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1829                 .rpc_argp       = &args,
1830                 .rpc_resp       = &res,
1831         };
1832         int                     status;
1833
1834         nfs_fattr_init(res.dir_attr);
1835         status = rpc_call_sync(server->client, &msg, 0);
1836         if (status == 0) {
1837                 update_changeattr(dir, &res.cinfo);
1838                 nfs_post_op_update_inode(dir, res.dir_attr);
1839         }
1840         return status;
1841 }
1842
1843 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1844 {
1845         struct nfs4_exception exception = { };
1846         int err;
1847         do {
1848                 err = nfs4_handle_exception(NFS_SERVER(dir),
1849                                 _nfs4_proc_remove(dir, name),
1850                                 &exception);
1851         } while (exception.retry);
1852         return err;
1853 }
1854
1855 struct unlink_desc {
1856         struct nfs4_remove_arg  args;
1857         struct nfs4_remove_res  res;
1858         struct nfs_fattr dir_attr;
1859 };
1860
1861 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1862                 struct qstr *name)
1863 {
1864         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1865         struct unlink_desc *up;
1866
1867         up = kmalloc(sizeof(*up), GFP_KERNEL);
1868         if (!up)
1869                 return -ENOMEM;
1870
1871         up->args.fh = NFS_FH(dir->d_inode);
1872         up->args.name = name;
1873         up->args.bitmask = server->attr_bitmask;
1874         up->res.server = server;
1875         up->res.dir_attr = &up->dir_attr;
1876
1877         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1878         msg->rpc_argp = &up->args;
1879         msg->rpc_resp = &up->res;
1880         return 0;
1881 }
1882
1883 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1884 {
1885         struct rpc_message *msg = &task->tk_msg;
1886         struct unlink_desc *up;
1887
1888         if (msg->rpc_resp != NULL) {
1889                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1890                 update_changeattr(dir->d_inode, &up->res.cinfo);
1891                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1892                 kfree(up);
1893                 msg->rpc_resp = NULL;
1894                 msg->rpc_argp = NULL;
1895         }
1896         return 0;
1897 }
1898
1899 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1900                 struct inode *new_dir, struct qstr *new_name)
1901 {
1902         struct nfs_server *server = NFS_SERVER(old_dir);
1903         struct nfs4_rename_arg arg = {
1904                 .old_dir = NFS_FH(old_dir),
1905                 .new_dir = NFS_FH(new_dir),
1906                 .old_name = old_name,
1907                 .new_name = new_name,
1908                 .bitmask = server->attr_bitmask,
1909         };
1910         struct nfs_fattr old_fattr, new_fattr;
1911         struct nfs4_rename_res res = {
1912                 .server = server,
1913                 .old_fattr = &old_fattr,
1914                 .new_fattr = &new_fattr,
1915         };
1916         struct rpc_message msg = {
1917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1918                 .rpc_argp = &arg,
1919                 .rpc_resp = &res,
1920         };
1921         int                     status;
1922
1923         nfs_fattr_init(res.old_fattr);
1924         nfs_fattr_init(res.new_fattr);
1925         status = rpc_call_sync(server->client, &msg, 0);
1926
1927         if (!status) {
1928                 update_changeattr(old_dir, &res.old_cinfo);
1929                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1930                 update_changeattr(new_dir, &res.new_cinfo);
1931                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1932         }
1933         return status;
1934 }
1935
1936 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1937                 struct inode *new_dir, struct qstr *new_name)
1938 {
1939         struct nfs4_exception exception = { };
1940         int err;
1941         do {
1942                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1943                                 _nfs4_proc_rename(old_dir, old_name,
1944                                         new_dir, new_name),
1945                                 &exception);
1946         } while (exception.retry);
1947         return err;
1948 }
1949
1950 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1951 {
1952         struct nfs_server *server = NFS_SERVER(inode);
1953         struct nfs4_link_arg arg = {
1954                 .fh     = NFS_FH(inode),
1955                 .dir_fh = NFS_FH(dir),
1956                 .name   = name,
1957                 .bitmask = server->attr_bitmask,
1958         };
1959         struct nfs_fattr fattr, dir_attr;
1960         struct nfs4_link_res res = {
1961                 .server = server,
1962                 .fattr = &fattr,
1963                 .dir_attr = &dir_attr,
1964         };
1965         struct rpc_message msg = {
1966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1967                 .rpc_argp = &arg,
1968                 .rpc_resp = &res,
1969         };
1970         int                     status;
1971
1972         nfs_fattr_init(res.fattr);
1973         nfs_fattr_init(res.dir_attr);
1974         status = rpc_call_sync(server->client, &msg, 0);
1975         if (!status) {
1976                 update_changeattr(dir, &res.cinfo);
1977                 nfs_post_op_update_inode(dir, res.dir_attr);
1978                 nfs_post_op_update_inode(inode, res.fattr);
1979         }
1980
1981         return status;
1982 }
1983
1984 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1985 {
1986         struct nfs4_exception exception = { };
1987         int err;
1988         do {
1989                 err = nfs4_handle_exception(NFS_SERVER(inode),
1990                                 _nfs4_proc_link(inode, dir, name),
1991                                 &exception);
1992         } while (exception.retry);
1993         return err;
1994 }
1995
1996 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
1997                 struct page *page, unsigned int len, struct iattr *sattr)
1998 {
1999         struct nfs_server *server = NFS_SERVER(dir);
2000         struct nfs_fh fhandle;
2001         struct nfs_fattr fattr, dir_fattr;
2002         struct nfs4_create_arg arg = {
2003                 .dir_fh = NFS_FH(dir),
2004                 .server = server,
2005                 .name = &dentry->d_name,
2006                 .attrs = sattr,
2007                 .ftype = NF4LNK,
2008                 .bitmask = server->attr_bitmask,
2009         };
2010         struct nfs4_create_res res = {
2011                 .server = server,
2012                 .fh = &fhandle,
2013                 .fattr = &fattr,
2014                 .dir_fattr = &dir_fattr,
2015         };
2016         struct rpc_message msg = {
2017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2018                 .rpc_argp = &arg,
2019                 .rpc_resp = &res,
2020         };
2021         int                     status;
2022
2023         if (len > NFS4_MAXPATHLEN)
2024                 return -ENAMETOOLONG;
2025
2026         arg.u.symlink.pages = &page;
2027         arg.u.symlink.len = len;
2028         nfs_fattr_init(&fattr);
2029         nfs_fattr_init(&dir_fattr);
2030
2031         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2032         if (!status) {
2033                 update_changeattr(dir, &res.dir_cinfo);
2034                 nfs_post_op_update_inode(dir, res.dir_fattr);
2035                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2036         }
2037         return status;
2038 }
2039
2040 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2041                 struct page *page, unsigned int len, struct iattr *sattr)
2042 {
2043         struct nfs4_exception exception = { };
2044         int err;
2045         do {
2046                 err = nfs4_handle_exception(NFS_SERVER(dir),
2047                                 _nfs4_proc_symlink(dir, dentry, page,
2048                                                         len, sattr),
2049                                 &exception);
2050         } while (exception.retry);
2051         return err;
2052 }
2053
2054 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2055                 struct iattr *sattr)
2056 {
2057         struct nfs_server *server = NFS_SERVER(dir);
2058         struct nfs_fh fhandle;
2059         struct nfs_fattr fattr, dir_fattr;
2060         struct nfs4_create_arg arg = {
2061                 .dir_fh = NFS_FH(dir),
2062                 .server = server,
2063                 .name = &dentry->d_name,
2064                 .attrs = sattr,
2065                 .ftype = NF4DIR,
2066                 .bitmask = server->attr_bitmask,
2067         };
2068         struct nfs4_create_res res = {
2069                 .server = server,
2070                 .fh = &fhandle,
2071                 .fattr = &fattr,
2072                 .dir_fattr = &dir_fattr,
2073         };
2074         struct rpc_message msg = {
2075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2076                 .rpc_argp = &arg,
2077                 .rpc_resp = &res,
2078         };
2079         int                     status;
2080
2081         nfs_fattr_init(&fattr);
2082         nfs_fattr_init(&dir_fattr);
2083
2084         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2085         if (!status) {
2086                 update_changeattr(dir, &res.dir_cinfo);
2087                 nfs_post_op_update_inode(dir, res.dir_fattr);
2088                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2089         }
2090         return status;
2091 }
2092
2093 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2094                 struct iattr *sattr)
2095 {
2096         struct nfs4_exception exception = { };
2097         int err;
2098         do {
2099                 err = nfs4_handle_exception(NFS_SERVER(dir),
2100                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2101                                 &exception);
2102         } while (exception.retry);
2103         return err;
2104 }
2105
2106 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2107                   u64 cookie, struct page *page, unsigned int count, int plus)
2108 {
2109         struct inode            *dir = dentry->d_inode;
2110         struct nfs4_readdir_arg args = {
2111                 .fh = NFS_FH(dir),
2112                 .pages = &page,
2113                 .pgbase = 0,
2114                 .count = count,
2115                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2116         };
2117         struct nfs4_readdir_res res;
2118         struct rpc_message msg = {
2119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2120                 .rpc_argp = &args,
2121                 .rpc_resp = &res,
2122                 .rpc_cred = cred,
2123         };
2124         int                     status;
2125
2126         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2127                         dentry->d_parent->d_name.name,
2128                         dentry->d_name.name,
2129                         (unsigned long long)cookie);
2130         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2131         res.pgbase = args.pgbase;
2132         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2133         if (status == 0)
2134                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2135         dprintk("%s: returns %d\n", __FUNCTION__, status);
2136         return status;
2137 }
2138
2139 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2140                   u64 cookie, struct page *page, unsigned int count, int plus)
2141 {
2142         struct nfs4_exception exception = { };
2143         int err;
2144         do {
2145                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2146                                 _nfs4_proc_readdir(dentry, cred, cookie,
2147                                         page, count, plus),
2148                                 &exception);
2149         } while (exception.retry);
2150         return err;
2151 }
2152
2153 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2154                 struct iattr *sattr, dev_t rdev)
2155 {
2156         struct nfs_server *server = NFS_SERVER(dir);
2157         struct nfs_fh fh;
2158         struct nfs_fattr fattr, dir_fattr;
2159         struct nfs4_create_arg arg = {
2160                 .dir_fh = NFS_FH(dir),
2161                 .server = server,
2162                 .name = &dentry->d_name,
2163                 .attrs = sattr,
2164                 .bitmask = server->attr_bitmask,
2165         };
2166         struct nfs4_create_res res = {
2167                 .server = server,
2168                 .fh = &fh,
2169                 .fattr = &fattr,
2170                 .dir_fattr = &dir_fattr,
2171         };
2172         struct rpc_message msg = {
2173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2174                 .rpc_argp = &arg,
2175                 .rpc_resp = &res,
2176         };
2177         int                     status;
2178         int                     mode = sattr->ia_mode;
2179
2180         nfs_fattr_init(&fattr);
2181         nfs_fattr_init(&dir_fattr);
2182
2183         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2184         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2185         if (S_ISFIFO(mode))
2186                 arg.ftype = NF4FIFO;
2187         else if (S_ISBLK(mode)) {
2188                 arg.ftype = NF4BLK;
2189                 arg.u.device.specdata1 = MAJOR(rdev);
2190                 arg.u.device.specdata2 = MINOR(rdev);
2191         }
2192         else if (S_ISCHR(mode)) {
2193                 arg.ftype = NF4CHR;
2194                 arg.u.device.specdata1 = MAJOR(rdev);
2195                 arg.u.device.specdata2 = MINOR(rdev);
2196         }
2197         else
2198                 arg.ftype = NF4SOCK;
2199
2200         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2201         if (status == 0) {
2202                 update_changeattr(dir, &res.dir_cinfo);
2203                 nfs_post_op_update_inode(dir, res.dir_fattr);
2204                 status = nfs_instantiate(dentry, &fh, &fattr);
2205         }
2206         return status;
2207 }
2208
2209 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2210                 struct iattr *sattr, dev_t rdev)
2211 {
2212         struct nfs4_exception exception = { };
2213         int err;
2214         do {
2215                 err = nfs4_handle_exception(NFS_SERVER(dir),
2216                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2217                                 &exception);
2218         } while (exception.retry);
2219         return err;
2220 }
2221
2222 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2223                  struct nfs_fsstat *fsstat)
2224 {
2225         struct nfs4_statfs_arg args = {
2226                 .fh = fhandle,
2227                 .bitmask = server->attr_bitmask,
2228         };
2229         struct rpc_message msg = {
2230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2231                 .rpc_argp = &args,
2232                 .rpc_resp = fsstat,
2233         };
2234
2235         nfs_fattr_init(fsstat->fattr);
2236         return rpc_call_sync(server->client, &msg, 0);
2237 }
2238
2239 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2240 {
2241         struct nfs4_exception exception = { };
2242         int err;
2243         do {
2244                 err = nfs4_handle_exception(server,
2245                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2246                                 &exception);
2247         } while (exception.retry);
2248         return err;
2249 }
2250
2251 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2252                 struct nfs_fsinfo *fsinfo)
2253 {
2254         struct nfs4_fsinfo_arg args = {
2255                 .fh = fhandle,
2256                 .bitmask = server->attr_bitmask,
2257         };
2258         struct rpc_message msg = {
2259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2260                 .rpc_argp = &args,
2261                 .rpc_resp = fsinfo,
2262         };
2263
2264         return rpc_call_sync(server->client, &msg, 0);
2265 }
2266
2267 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2268 {
2269         struct nfs4_exception exception = { };
2270         int err;
2271
2272         do {
2273                 err = nfs4_handle_exception(server,
2274                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2275                                 &exception);
2276         } while (exception.retry);
2277         return err;
2278 }
2279
2280 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2281 {
2282         nfs_fattr_init(fsinfo->fattr);
2283         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2284 }
2285
2286 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2287                 struct nfs_pathconf *pathconf)
2288 {
2289         struct nfs4_pathconf_arg args = {
2290                 .fh = fhandle,
2291                 .bitmask = server->attr_bitmask,
2292         };
2293         struct rpc_message msg = {
2294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2295                 .rpc_argp = &args,
2296                 .rpc_resp = pathconf,
2297         };
2298
2299         /* None of the pathconf attributes are mandatory to implement */
2300         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2301                 memset(pathconf, 0, sizeof(*pathconf));
2302                 return 0;
2303         }
2304
2305         nfs_fattr_init(pathconf->fattr);
2306         return rpc_call_sync(server->client, &msg, 0);
2307 }
2308
2309 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2310                 struct nfs_pathconf *pathconf)
2311 {
2312         struct nfs4_exception exception = { };
2313         int err;
2314
2315         do {
2316                 err = nfs4_handle_exception(server,
2317                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2318                                 &exception);
2319         } while (exception.retry);
2320         return err;
2321 }
2322
2323 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2324 {
2325         struct nfs_server *server = NFS_SERVER(data->inode);
2326
2327         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2328                 rpc_restart_call(task);
2329                 return -EAGAIN;
2330         }
2331         if (task->tk_status > 0)
2332                 renew_lease(server, data->timestamp);
2333         return 0;
2334 }
2335
2336 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2337 {
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2340                 .rpc_argp = &data->args,
2341                 .rpc_resp = &data->res,
2342                 .rpc_cred = data->cred,
2343         };
2344
2345         data->timestamp   = jiffies;
2346
2347         rpc_call_setup(&data->task, &msg, 0);
2348 }
2349
2350 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2351 {
2352         struct inode *inode = data->inode;
2353
2354         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2355                 rpc_restart_call(task);
2356                 return -EAGAIN;
2357         }
2358         if (task->tk_status >= 0) {
2359                 renew_lease(NFS_SERVER(inode), data->timestamp);
2360                 nfs_post_op_update_inode(inode, data->res.fattr);
2361         }
2362         return 0;
2363 }
2364
2365 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2366 {
2367         struct rpc_message msg = {
2368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2369                 .rpc_argp = &data->args,
2370                 .rpc_resp = &data->res,
2371                 .rpc_cred = data->cred,
2372         };
2373         struct inode *inode = data->inode;
2374         struct nfs_server *server = NFS_SERVER(inode);
2375         int stable;
2376
2377         if (how & FLUSH_STABLE) {
2378                 if (!NFS_I(inode)->ncommit)
2379                         stable = NFS_FILE_SYNC;
2380                 else
2381                         stable = NFS_DATA_SYNC;
2382         } else
2383                 stable = NFS_UNSTABLE;
2384         data->args.stable = stable;
2385         data->args.bitmask = server->attr_bitmask;
2386         data->res.server = server;
2387
2388         data->timestamp   = jiffies;
2389
2390         /* Finalize the task. */
2391         rpc_call_setup(&data->task, &msg, 0);
2392 }
2393
2394 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2395 {
2396         struct inode *inode = data->inode;
2397
2398         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2399                 rpc_restart_call(task);
2400                 return -EAGAIN;
2401         }
2402         if (task->tk_status >= 0)
2403                 nfs_post_op_update_inode(inode, data->res.fattr);
2404         return 0;
2405 }
2406
2407 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2408 {
2409         struct rpc_message msg = {
2410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2411                 .rpc_argp = &data->args,
2412                 .rpc_resp = &data->res,
2413                 .rpc_cred = data->cred,
2414         };
2415         struct nfs_server *server = NFS_SERVER(data->inode);
2416
2417         data->args.bitmask = server->attr_bitmask;
2418         data->res.server = server;
2419
2420         rpc_call_setup(&data->task, &msg, 0);
2421 }
2422
2423 /*
2424  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2425  * standalone procedure for queueing an asynchronous RENEW.
2426  */
2427 static void nfs4_renew_done(struct rpc_task *task, void *data)
2428 {
2429         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2430         unsigned long timestamp = (unsigned long)data;
2431
2432         if (task->tk_status < 0) {
2433                 switch (task->tk_status) {
2434                         case -NFS4ERR_STALE_CLIENTID:
2435                         case -NFS4ERR_EXPIRED:
2436                         case -NFS4ERR_CB_PATH_DOWN:
2437                                 nfs4_schedule_state_recovery(clp);
2438                 }
2439                 return;
2440         }
2441         spin_lock(&clp->cl_lock);
2442         if (time_before(clp->cl_last_renewal,timestamp))
2443                 clp->cl_last_renewal = timestamp;
2444         spin_unlock(&clp->cl_lock);
2445 }
2446
2447 static const struct rpc_call_ops nfs4_renew_ops = {
2448         .rpc_call_done = nfs4_renew_done,
2449 };
2450
2451 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2452 {
2453         struct rpc_message msg = {
2454                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2455                 .rpc_argp       = clp,
2456                 .rpc_cred       = cred,
2457         };
2458
2459         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2460                         &nfs4_renew_ops, (void *)jiffies);
2461 }
2462
2463 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2464 {
2465         struct rpc_message msg = {
2466                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2467                 .rpc_argp       = clp,
2468                 .rpc_cred       = cred,
2469         };
2470         unsigned long now = jiffies;
2471         int status;
2472
2473         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2474         if (status < 0)
2475                 return status;
2476         spin_lock(&clp->cl_lock);
2477         if (time_before(clp->cl_last_renewal,now))
2478                 clp->cl_last_renewal = now;
2479         spin_unlock(&clp->cl_lock);
2480         return 0;
2481 }
2482
2483 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2484 {
2485         return (server->caps & NFS_CAP_ACLS)
2486                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2487                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2488 }
2489
2490 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2491  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2492  * the stack.
2493  */
2494 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2495
2496 static void buf_to_pages(const void *buf, size_t buflen,
2497                 struct page **pages, unsigned int *pgbase)
2498 {
2499         const void *p = buf;
2500
2501         *pgbase = offset_in_page(buf);
2502         p -= *pgbase;
2503         while (p < buf + buflen) {
2504                 *(pages++) = virt_to_page(p);
2505                 p += PAGE_CACHE_SIZE;
2506         }
2507 }
2508
2509 struct nfs4_cached_acl {
2510         int cached;
2511         size_t len;
2512         char data[0];
2513 };
2514
2515 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2516 {
2517         struct nfs_inode *nfsi = NFS_I(inode);
2518
2519         spin_lock(&inode->i_lock);
2520         kfree(nfsi->nfs4_acl);
2521         nfsi->nfs4_acl = acl;
2522         spin_unlock(&inode->i_lock);
2523 }
2524
2525 static void nfs4_zap_acl_attr(struct inode *inode)
2526 {
2527         nfs4_set_cached_acl(inode, NULL);
2528 }
2529
2530 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2531 {
2532         struct nfs_inode *nfsi = NFS_I(inode);
2533         struct nfs4_cached_acl *acl;
2534         int ret = -ENOENT;
2535
2536         spin_lock(&inode->i_lock);
2537         acl = nfsi->nfs4_acl;
2538         if (acl == NULL)
2539                 goto out;
2540         if (buf == NULL) /* user is just asking for length */
2541                 goto out_len;
2542         if (acl->cached == 0)
2543                 goto out;
2544         ret = -ERANGE; /* see getxattr(2) man page */
2545         if (acl->len > buflen)
2546                 goto out;
2547         memcpy(buf, acl->data, acl->len);
2548 out_len:
2549         ret = acl->len;
2550 out:
2551         spin_unlock(&inode->i_lock);
2552         return ret;
2553 }
2554
2555 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2556 {
2557         struct nfs4_cached_acl *acl;
2558
2559         if (buf && acl_len <= PAGE_SIZE) {
2560                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2561                 if (acl == NULL)
2562                         goto out;
2563                 acl->cached = 1;
2564                 memcpy(acl->data, buf, acl_len);
2565         } else {
2566                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2567                 if (acl == NULL)
2568                         goto out;
2569                 acl->cached = 0;
2570         }
2571         acl->len = acl_len;
2572 out:
2573         nfs4_set_cached_acl(inode, acl);
2574 }
2575
2576 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2577 {
2578         struct page *pages[NFS4ACL_MAXPAGES];
2579         struct nfs_getaclargs args = {
2580                 .fh = NFS_FH(inode),
2581                 .acl_pages = pages,
2582                 .acl_len = buflen,
2583         };
2584         size_t resp_len = buflen;
2585         void *resp_buf;
2586         struct rpc_message msg = {
2587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2588                 .rpc_argp = &args,
2589                 .rpc_resp = &resp_len,
2590         };
2591         struct page *localpage = NULL;
2592         int ret;
2593
2594         if (buflen < PAGE_SIZE) {
2595                 /* As long as we're doing a round trip to the server anyway,
2596                  * let's be prepared for a page of acl data. */
2597                 localpage = alloc_page(GFP_KERNEL);
2598                 resp_buf = page_address(localpage);
2599                 if (localpage == NULL)
2600                         return -ENOMEM;
2601                 args.acl_pages[0] = localpage;
2602                 args.acl_pgbase = 0;
2603                 resp_len = args.acl_len = PAGE_SIZE;
2604         } else {
2605                 resp_buf = buf;
2606                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2607         }
2608         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2609         if (ret)
2610                 goto out_free;
2611         if (resp_len > args.acl_len)
2612                 nfs4_write_cached_acl(inode, NULL, resp_len);
2613         else
2614                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2615         if (buf) {
2616                 ret = -ERANGE;
2617                 if (resp_len > buflen)
2618                         goto out_free;
2619                 if (localpage)
2620                         memcpy(buf, resp_buf, resp_len);
2621         }
2622         ret = resp_len;
2623 out_free:
2624         if (localpage)
2625                 __free_page(localpage);
2626         return ret;
2627 }
2628
2629 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2630 {
2631         struct nfs4_exception exception = { };
2632         ssize_t ret;
2633         do {
2634                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2635                 if (ret >= 0)
2636                         break;
2637                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2638         } while (exception.retry);
2639         return ret;
2640 }
2641
2642 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2643 {
2644         struct nfs_server *server = NFS_SERVER(inode);
2645         int ret;
2646
2647         if (!nfs4_server_supports_acls(server))
2648                 return -EOPNOTSUPP;
2649         ret = nfs_revalidate_inode(server, inode);
2650         if (ret < 0)
2651                 return ret;
2652         ret = nfs4_read_cached_acl(inode, buf, buflen);
2653         if (ret != -ENOENT)
2654                 return ret;
2655         return nfs4_get_acl_uncached(inode, buf, buflen);
2656 }
2657
2658 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2659 {
2660         struct nfs_server *server = NFS_SERVER(inode);
2661         struct page *pages[NFS4ACL_MAXPAGES];
2662         struct nfs_setaclargs arg = {
2663                 .fh             = NFS_FH(inode),
2664                 .acl_pages      = pages,
2665                 .acl_len        = buflen,
2666         };
2667         struct rpc_message msg = {
2668                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2669                 .rpc_argp       = &arg,
2670                 .rpc_resp       = NULL,
2671         };
2672         int ret;
2673
2674         if (!nfs4_server_supports_acls(server))
2675                 return -EOPNOTSUPP;
2676         nfs_inode_return_delegation(inode);
2677         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2678         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2679         nfs_zap_caches(inode);
2680         return ret;
2681 }
2682
2683 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2684 {
2685         struct nfs4_exception exception = { };
2686         int err;
2687         do {
2688                 err = nfs4_handle_exception(NFS_SERVER(inode),
2689                                 __nfs4_proc_set_acl(inode, buf, buflen),
2690                                 &exception);
2691         } while (exception.retry);
2692         return err;
2693 }
2694
2695 static int
2696 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2697 {
2698         struct nfs_client *clp = server->nfs_client;
2699
2700         if (!clp || task->tk_status >= 0)
2701                 return 0;
2702         switch(task->tk_status) {
2703                 case -NFS4ERR_STALE_CLIENTID:
2704                 case -NFS4ERR_STALE_STATEID:
2705                 case -NFS4ERR_EXPIRED:
2706                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2707                         nfs4_schedule_state_recovery(clp);
2708                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2709                                 rpc_wake_up_task(task);
2710                         task->tk_status = 0;
2711                         return -EAGAIN;
2712                 case -NFS4ERR_DELAY:
2713                         nfs_inc_server_stats((struct nfs_server *) server,
2714                                                 NFSIOS_DELAY);
2715                 case -NFS4ERR_GRACE:
2716                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2717                         task->tk_status = 0;
2718                         return -EAGAIN;
2719                 case -NFS4ERR_OLD_STATEID:
2720                         task->tk_status = 0;
2721                         return -EAGAIN;
2722         }
2723         task->tk_status = nfs4_map_errors(task->tk_status);
2724         return 0;
2725 }
2726
2727 static int nfs4_wait_bit_interruptible(void *word)
2728 {
2729         if (signal_pending(current))
2730                 return -ERESTARTSYS;
2731         schedule();
2732         return 0;
2733 }
2734
2735 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2736 {
2737         sigset_t oldset;
2738         int res;
2739
2740         might_sleep();
2741
2742         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2743
2744         rpc_clnt_sigmask(clnt, &oldset);
2745         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2746                         nfs4_wait_bit_interruptible,
2747                         TASK_INTERRUPTIBLE);
2748         rpc_clnt_sigunmask(clnt, &oldset);
2749
2750         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2751         return res;
2752 }
2753
2754 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2755 {
2756         sigset_t oldset;
2757         int res = 0;
2758
2759         might_sleep();
2760
2761         if (*timeout <= 0)
2762                 *timeout = NFS4_POLL_RETRY_MIN;
2763         if (*timeout > NFS4_POLL_RETRY_MAX)
2764                 *timeout = NFS4_POLL_RETRY_MAX;
2765         rpc_clnt_sigmask(clnt, &oldset);
2766         if (clnt->cl_intr) {
2767                 schedule_timeout_interruptible(*timeout);
2768                 if (signalled())
2769                         res = -ERESTARTSYS;
2770         } else
2771                 schedule_timeout_uninterruptible(*timeout);
2772         rpc_clnt_sigunmask(clnt, &oldset);
2773         *timeout <<= 1;
2774         return res;
2775 }
2776
2777 /* This is the error handling routine for processes that are allowed
2778  * to sleep.
2779  */
2780 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2781 {
2782         struct nfs_client *clp = server->nfs_client;
2783         int ret = errorcode;
2784
2785         exception->retry = 0;
2786         switch(errorcode) {
2787                 case 0:
2788                         return 0;
2789                 case -NFS4ERR_STALE_CLIENTID:
2790                 case -NFS4ERR_STALE_STATEID:
2791                 case -NFS4ERR_EXPIRED:
2792                         nfs4_schedule_state_recovery(clp);
2793                         ret = nfs4_wait_clnt_recover(server->client, clp);
2794                         if (ret == 0)
2795                                 exception->retry = 1;
2796                         break;
2797                 case -NFS4ERR_FILE_OPEN:
2798                 case -NFS4ERR_GRACE:
2799                 case -NFS4ERR_DELAY:
2800                         ret = nfs4_delay(server->client, &exception->timeout);
2801                         if (ret != 0)
2802                                 break;
2803                 case -NFS4ERR_OLD_STATEID:
2804                         exception->retry = 1;
2805         }
2806         /* We failed to handle the error */
2807         return nfs4_map_errors(ret);
2808 }
2809
2810 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2811 {
2812         nfs4_verifier sc_verifier;
2813         struct nfs4_setclientid setclientid = {
2814                 .sc_verifier = &sc_verifier,
2815                 .sc_prog = program,
2816         };
2817         struct rpc_message msg = {
2818                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2819                 .rpc_argp = &setclientid,
2820                 .rpc_resp = clp,
2821                 .rpc_cred = cred,
2822         };
2823         __be32 *p;
2824         int loop = 0;
2825         int status;
2826
2827         p = (__be32*)sc_verifier.data;
2828         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2829         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2830
2831         for(;;) {
2832                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2833                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2834                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2835                                 cred->cr_ops->cr_name,
2836                                 clp->cl_id_uniquifier);
2837                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2838                                 sizeof(setclientid.sc_netid), "tcp");
2839                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2840                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2841                                 clp->cl_ipaddr, port >> 8, port & 255);
2842
2843                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2844                 if (status != -NFS4ERR_CLID_INUSE)
2845                         break;
2846                 if (signalled())
2847                         break;
2848                 if (loop++ & 1)
2849                         ssleep(clp->cl_lease_time + 1);
2850                 else
2851                         if (++clp->cl_id_uniquifier == 0)
2852                                 break;
2853         }
2854         return status;
2855 }
2856
2857 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2858 {
2859         struct nfs_fsinfo fsinfo;
2860         struct rpc_message msg = {
2861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2862                 .rpc_argp = clp,
2863                 .rpc_resp = &fsinfo,
2864                 .rpc_cred = cred,
2865         };
2866         unsigned long now;
2867         int status;
2868
2869         now = jiffies;
2870         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2871         if (status == 0) {
2872                 spin_lock(&clp->cl_lock);
2873                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2874                 clp->cl_last_renewal = now;
2875                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2876                 spin_unlock(&clp->cl_lock);
2877         }
2878         return status;
2879 }
2880
2881 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2882 {
2883         long timeout;
2884         int err;
2885         do {
2886                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2887                 switch (err) {
2888                         case 0:
2889                                 return err;
2890                         case -NFS4ERR_RESOURCE:
2891                                 /* The IBM lawyers misread another document! */
2892                         case -NFS4ERR_DELAY:
2893                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2894                 }
2895         } while (err == 0);
2896         return err;
2897 }
2898
2899 struct nfs4_delegreturndata {
2900         struct nfs4_delegreturnargs args;
2901         struct nfs4_delegreturnres res;
2902         struct nfs_fh fh;
2903         nfs4_stateid stateid;
2904         struct rpc_cred *cred;
2905         unsigned long timestamp;
2906         struct nfs_fattr fattr;
2907         int rpc_status;
2908 };
2909
2910 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2911 {
2912         struct nfs4_delegreturndata *data = calldata;
2913         struct rpc_message msg = {
2914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2915                 .rpc_argp = &data->args,
2916                 .rpc_resp = &data->res,
2917                 .rpc_cred = data->cred,
2918         };
2919         nfs_fattr_init(data->res.fattr);
2920         rpc_call_setup(task, &msg, 0);
2921 }
2922
2923 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2924 {
2925         struct nfs4_delegreturndata *data = calldata;
2926         data->rpc_status = task->tk_status;
2927         if (data->rpc_status == 0)
2928                 renew_lease(data->res.server, data->timestamp);
2929 }
2930
2931 static void nfs4_delegreturn_release(void *calldata)
2932 {
2933         struct nfs4_delegreturndata *data = calldata;
2934
2935         put_rpccred(data->cred);
2936         kfree(calldata);
2937 }
2938
2939 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2940         .rpc_call_prepare = nfs4_delegreturn_prepare,
2941         .rpc_call_done = nfs4_delegreturn_done,
2942         .rpc_release = nfs4_delegreturn_release,
2943 };
2944
2945 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2946 {
2947         struct nfs4_delegreturndata *data;
2948         struct nfs_server *server = NFS_SERVER(inode);
2949         struct rpc_task *task;
2950         int status;
2951
2952         data = kmalloc(sizeof(*data), GFP_KERNEL);
2953         if (data == NULL)
2954                 return -ENOMEM;
2955         data->args.fhandle = &data->fh;
2956         data->args.stateid = &data->stateid;
2957         data->args.bitmask = server->attr_bitmask;
2958         nfs_copy_fh(&data->fh, NFS_FH(inode));
2959         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2960         data->res.fattr = &data->fattr;
2961         data->res.server = server;
2962         data->cred = get_rpccred(cred);
2963         data->timestamp = jiffies;
2964         data->rpc_status = 0;
2965
2966         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2967         if (IS_ERR(task))
2968                 return PTR_ERR(task);
2969         status = nfs4_wait_for_completion_rpc_task(task);
2970         if (status == 0) {
2971                 status = data->rpc_status;
2972                 if (status == 0)
2973                         nfs_post_op_update_inode(inode, &data->fattr);
2974         }
2975         rpc_put_task(task);
2976         return status;
2977 }
2978
2979 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2980 {
2981         struct nfs_server *server = NFS_SERVER(inode);
2982         struct nfs4_exception exception = { };
2983         int err;
2984         do {
2985                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2986                 switch (err) {
2987                         case -NFS4ERR_STALE_STATEID:
2988                         case -NFS4ERR_EXPIRED:
2989                         case 0:
2990                                 return 0;
2991                 }
2992                 err = nfs4_handle_exception(server, err, &exception);
2993         } while (exception.retry);
2994         return err;
2995 }
2996
2997 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2998 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2999
3000 /*
3001  * sleep, with exponential backoff, and retry the LOCK operation.
3002  */
3003 static unsigned long
3004 nfs4_set_lock_task_retry(unsigned long timeout)
3005 {
3006         schedule_timeout_interruptible(timeout);
3007         timeout <<= 1;
3008         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3009                 return NFS4_LOCK_MAXTIMEOUT;
3010         return timeout;
3011 }
3012
3013 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3014 {
3015         struct inode *inode = state->inode;
3016         struct nfs_server *server = NFS_SERVER(inode);
3017         struct nfs_client *clp = server->nfs_client;
3018         struct nfs_lockt_args arg = {
3019                 .fh = NFS_FH(inode),
3020                 .fl = request,
3021         };
3022         struct nfs_lockt_res res = {
3023                 .denied = request,
3024         };
3025         struct rpc_message msg = {
3026                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3027                 .rpc_argp       = &arg,
3028                 .rpc_resp       = &res,
3029                 .rpc_cred       = state->owner->so_cred,
3030         };
3031         struct nfs4_lock_state *lsp;
3032         int status;
3033
3034         down_read(&clp->cl_sem);
3035         arg.lock_owner.clientid = clp->cl_clientid;
3036         status = nfs4_set_lock_state(state, request);
3037         if (status != 0)
3038                 goto out;
3039         lsp = request->fl_u.nfs4_fl.owner;
3040         arg.lock_owner.id = lsp->ls_id.id;
3041         status = rpc_call_sync(server->client, &msg, 0);
3042         switch (status) {
3043                 case 0:
3044                         request->fl_type = F_UNLCK;
3045                         break;
3046                 case -NFS4ERR_DENIED:
3047                         status = 0;
3048         }
3049         request->fl_ops->fl_release_private(request);
3050 out:
3051         up_read(&clp->cl_sem);
3052         return status;
3053 }
3054
3055 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3056 {
3057         struct nfs4_exception exception = { };
3058         int err;
3059
3060         do {
3061                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3062                                 _nfs4_proc_getlk(state, cmd, request),
3063                                 &exception);
3064         } while (exception.retry);
3065         return err;
3066 }
3067
3068 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3069 {
3070         int res = 0;
3071         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3072                 case FL_POSIX:
3073                         res = posix_lock_file_wait(file, fl);
3074                         break;
3075                 case FL_FLOCK:
3076                         res = flock_lock_file_wait(file, fl);
3077                         break;
3078                 default:
3079                         BUG();
3080         }
3081         return res;
3082 }
3083
3084 struct nfs4_unlockdata {
3085         struct nfs_locku_args arg;
3086         struct nfs_locku_res res;
3087         struct nfs4_lock_state *lsp;
3088         struct nfs_open_context *ctx;
3089         struct file_lock fl;
3090         const struct nfs_server *server;
3091         unsigned long timestamp;
3092 };
3093
3094 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3095                 struct nfs_open_context *ctx,
3096                 struct nfs4_lock_state *lsp,
3097                 struct nfs_seqid *seqid)
3098 {
3099         struct nfs4_unlockdata *p;
3100         struct inode *inode = lsp->ls_state->inode;
3101
3102         p = kmalloc(sizeof(*p), GFP_KERNEL);
3103         if (p == NULL)
3104                 return NULL;
3105         p->arg.fh = NFS_FH(inode);
3106         p->arg.fl = &p->fl;
3107         p->arg.seqid = seqid;
3108         p->arg.stateid = &lsp->ls_stateid;
3109         p->lsp = lsp;
3110         atomic_inc(&lsp->ls_count);
3111         /* Ensure we don't close file until we're done freeing locks! */
3112         p->ctx = get_nfs_open_context(ctx);
3113         memcpy(&p->fl, fl, sizeof(p->fl));
3114         p->server = NFS_SERVER(inode);
3115         return p;
3116 }
3117
3118 static void nfs4_locku_release_calldata(void *data)
3119 {
3120         struct nfs4_unlockdata *calldata = data;
3121         nfs_free_seqid(calldata->arg.seqid);
3122         nfs4_put_lock_state(calldata->lsp);
3123         put_nfs_open_context(calldata->ctx);
3124         kfree(calldata);
3125 }
3126
3127 static void nfs4_locku_done(struct rpc_task *task, void *data)
3128 {
3129         struct nfs4_unlockdata *calldata = data;
3130
3131         if (RPC_ASSASSINATED(task))
3132                 return;
3133         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3134         switch (task->tk_status) {
3135                 case 0:
3136                         memcpy(calldata->lsp->ls_stateid.data,
3137                                         calldata->res.stateid.data,
3138                                         sizeof(calldata->lsp->ls_stateid.data));
3139                         renew_lease(calldata->server, calldata->timestamp);
3140                         break;
3141                 case -NFS4ERR_STALE_STATEID:
3142                 case -NFS4ERR_EXPIRED:
3143                         break;
3144                 default:
3145                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3146                                 rpc_restart_call(task);
3147         }
3148 }
3149
3150 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3151 {
3152         struct nfs4_unlockdata *calldata = data;
3153         struct rpc_message msg = {
3154                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3155                 .rpc_argp       = &calldata->arg,
3156                 .rpc_resp       = &calldata->res,
3157                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3158         };
3159
3160         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3161                 return;
3162         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3163                 /* Note: exit _without_ running nfs4_locku_done */
3164                 task->tk_action = NULL;
3165                 return;
3166         }
3167         calldata->timestamp = jiffies;
3168         rpc_call_setup(task, &msg, 0);
3169 }
3170
3171 static const struct rpc_call_ops nfs4_locku_ops = {
3172         .rpc_call_prepare = nfs4_locku_prepare,
3173         .rpc_call_done = nfs4_locku_done,
3174         .rpc_release = nfs4_locku_release_calldata,
3175 };
3176
3177 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3178                 struct nfs_open_context *ctx,
3179                 struct nfs4_lock_state *lsp,
3180                 struct nfs_seqid *seqid)
3181 {
3182         struct nfs4_unlockdata *data;
3183
3184         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3185         if (data == NULL) {
3186                 nfs_free_seqid(seqid);
3187                 return ERR_PTR(-ENOMEM);
3188         }
3189
3190         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3191 }
3192
3193 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3194 {
3195         struct nfs_seqid *seqid;
3196         struct nfs4_lock_state *lsp;
3197         struct rpc_task *task;
3198         int status = 0;
3199
3200         status = nfs4_set_lock_state(state, request);
3201         /* Unlock _before_ we do the RPC call */
3202         request->fl_flags |= FL_EXISTS;
3203         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3204                 goto out;
3205         if (status != 0)
3206                 goto out;
3207         /* Is this a delegated lock? */
3208         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3209                 goto out;
3210         lsp = request->fl_u.nfs4_fl.owner;
3211         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3212         status = -ENOMEM;
3213         if (seqid == NULL)
3214                 goto out;
3215         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3216         status = PTR_ERR(task);
3217         if (IS_ERR(task))
3218                 goto out;
3219         status = nfs4_wait_for_completion_rpc_task(task);
3220         rpc_put_task(task);
3221 out:
3222         return status;
3223 }
3224
3225 struct nfs4_lockdata {
3226         struct nfs_lock_args arg;
3227         struct nfs_lock_res res;
3228         struct nfs4_lock_state *lsp;
3229         struct nfs_open_context *ctx;
3230         struct file_lock fl;
3231         unsigned long timestamp;
3232         int rpc_status;
3233         int cancelled;
3234 };
3235
3236 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3237                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3238 {
3239         struct nfs4_lockdata *p;
3240         struct inode *inode = lsp->ls_state->inode;
3241         struct nfs_server *server = NFS_SERVER(inode);
3242
3243         p = kzalloc(sizeof(*p), GFP_KERNEL);
3244         if (p == NULL)
3245                 return NULL;
3246
3247         p->arg.fh = NFS_FH(inode);
3248         p->arg.fl = &p->fl;
3249         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3250         if (p->arg.lock_seqid == NULL)
3251                 goto out_free;
3252         p->arg.lock_stateid = &lsp->ls_stateid;
3253         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3254         p->arg.lock_owner.id = lsp->ls_id.id;
3255         p->lsp = lsp;
3256         atomic_inc(&lsp->ls_count);
3257         p->ctx = get_nfs_open_context(ctx);
3258         memcpy(&p->fl, fl, sizeof(p->fl));
3259         return p;
3260 out_free:
3261         kfree(p);
3262         return NULL;
3263 }
3264
3265 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3266 {
3267         struct nfs4_lockdata *data = calldata;
3268         struct nfs4_state *state = data->lsp->ls_state;
3269         struct nfs4_state_owner *sp = state->owner;
3270         struct rpc_message msg = {
3271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3272                 .rpc_argp = &data->arg,
3273                 .rpc_resp = &data->res,
3274                 .rpc_cred = sp->so_cred,
3275         };
3276
3277         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3278                 return;
3279         dprintk("%s: begin!\n", __FUNCTION__);
3280         /* Do we need to do an open_to_lock_owner? */
3281         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3282                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3283                 if (data->arg.open_seqid == NULL) {
3284                         data->rpc_status = -ENOMEM;
3285                         task->tk_action = NULL;
3286                         goto out;
3287                 }
3288                 data->arg.open_stateid = &state->stateid;
3289                 data->arg.new_lock_owner = 1;
3290         }
3291         data->timestamp = jiffies;
3292         rpc_call_setup(task, &msg, 0);
3293 out:
3294         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3295 }
3296
3297 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3298 {
3299         struct nfs4_lockdata *data = calldata;
3300
3301         dprintk("%s: begin!\n", __FUNCTION__);
3302
3303         data->rpc_status = task->tk_status;
3304         if (RPC_ASSASSINATED(task))
3305                 goto out;
3306         if (data->arg.new_lock_owner != 0) {
3307                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3308                 if (data->rpc_status == 0)
3309                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3310                 else
3311                         goto out;
3312         }
3313         if (data->rpc_status == 0) {
3314                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3315                                         sizeof(data->lsp->ls_stateid.data));
3316                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3317                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3318         }
3319         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3320 out:
3321         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3322 }
3323
3324 static void nfs4_lock_release(void *calldata)
3325 {
3326         struct nfs4_lockdata *data = calldata;
3327
3328         dprintk("%s: begin!\n", __FUNCTION__);
3329         if (data->arg.open_seqid != NULL)
3330                 nfs_free_seqid(data->arg.open_seqid);
3331         if (data->cancelled != 0) {
3332                 struct rpc_task *task;
3333                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3334                                 data->arg.lock_seqid);
3335                 if (!IS_ERR(task))
3336                         rpc_put_task(task);
3337                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3338         } else
3339                 nfs_free_seqid(data->arg.lock_seqid);
3340         nfs4_put_lock_state(data->lsp);
3341         put_nfs_open_context(data->ctx);
3342         kfree(data);
3343         dprintk("%s: done!\n", __FUNCTION__);
3344 }
3345
3346 static const struct rpc_call_ops nfs4_lock_ops = {
3347         .rpc_call_prepare = nfs4_lock_prepare,
3348         .rpc_call_done = nfs4_lock_done,
3349         .rpc_release = nfs4_lock_release,
3350 };
3351
3352 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3353 {
3354         struct nfs4_lockdata *data;
3355         struct rpc_task *task;
3356         int ret;
3357
3358         dprintk("%s: begin!\n", __FUNCTION__);
3359         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3360                         fl->fl_u.nfs4_fl.owner);
3361         if (data == NULL)
3362                 return -ENOMEM;
3363         if (IS_SETLKW(cmd))
3364                 data->arg.block = 1;
3365         if (reclaim != 0)
3366                 data->arg.reclaim = 1;
3367         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3368                         &nfs4_lock_ops, data);
3369         if (IS_ERR(task))
3370                 return PTR_ERR(task);
3371         ret = nfs4_wait_for_completion_rpc_task(task);
3372         if (ret == 0) {
3373                 ret = data->rpc_status;
3374                 if (ret == -NFS4ERR_DENIED)
3375                         ret = -EAGAIN;
3376         } else
3377                 data->cancelled = 1;
3378         rpc_put_task(task);
3379         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3380         return ret;
3381 }
3382
3383 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3384 {
3385         struct nfs_server *server = NFS_SERVER(state->inode);
3386         struct nfs4_exception exception = { };
3387         int err;
3388
3389         do {
3390                 /* Cache the lock if possible... */
3391                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3392                         return 0;
3393                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3394                 if (err != -NFS4ERR_DELAY)
3395                         break;
3396                 nfs4_handle_exception(server, err, &exception);
3397         } while (exception.retry);
3398         return err;
3399 }
3400
3401 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3402 {
3403         struct nfs_server *server = NFS_SERVER(state->inode);
3404         struct nfs4_exception exception = { };
3405         int err;
3406
3407         err = nfs4_set_lock_state(state, request);
3408         if (err != 0)
3409                 return err;
3410         do {
3411                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3412                         return 0;
3413                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3414                 if (err != -NFS4ERR_DELAY)
3415                         break;
3416                 nfs4_handle_exception(server, err, &exception);
3417         } while (exception.retry);
3418         return err;
3419 }
3420
3421 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3422 {
3423         struct nfs_client *clp = state->owner->so_client;
3424         unsigned char fl_flags = request->fl_flags;
3425         int status;
3426
3427         /* Is this a delegated open? */
3428         status = nfs4_set_lock_state(state, request);
3429         if (status != 0)
3430                 goto out;
3431         request->fl_flags |= FL_ACCESS;
3432         status = do_vfs_lock(request->fl_file, request);
3433         if (status < 0)
3434                 goto out;
3435         down_read(&clp->cl_sem);
3436         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3437                 struct nfs_inode *nfsi = NFS_I(state->inode);
3438                 /* Yes: cache locks! */
3439                 down_read(&nfsi->rwsem);
3440                 /* ...but avoid races with delegation recall... */
3441                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3442                         request->fl_flags = fl_flags & ~FL_SLEEP;
3443                         status = do_vfs_lock(request->fl_file, request);
3444                         up_read(&nfsi->rwsem);
3445                         goto out_unlock;
3446                 }
3447                 up_read(&nfsi->rwsem);
3448         }
3449         status = _nfs4_do_setlk(state, cmd, request, 0);
3450         if (status != 0)
3451                 goto out_unlock;
3452         /* Note: we always want to sleep here! */
3453         request->fl_flags = fl_flags | FL_SLEEP;
3454         if (do_vfs_lock(request->fl_file, request) < 0)
3455                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3456 out_unlock:
3457         up_read(&clp->cl_sem);
3458 out:
3459         request->fl_flags = fl_flags;
3460         return status;
3461 }
3462
3463 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3464 {
3465         struct nfs4_exception exception = { };
3466         int err;
3467
3468         do {
3469                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3470                                 _nfs4_proc_setlk(state, cmd, request),
3471                                 &exception);
3472         } while (exception.retry);
3473         return err;
3474 }
3475
3476 static int
3477 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3478 {
3479         struct nfs_open_context *ctx;
3480         struct nfs4_state *state;
3481         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3482         int status;
3483
3484         /* verify open state */
3485         ctx = (struct nfs_open_context *)filp->private_data;
3486         state = ctx->state;
3487
3488         if (request->fl_start < 0 || request->fl_end < 0)
3489                 return -EINVAL;
3490
3491         if (IS_GETLK(cmd))
3492                 return nfs4_proc_getlk(state, F_GETLK, request);
3493
3494         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3495                 return -EINVAL;
3496
3497         if (request->fl_type == F_UNLCK)
3498                 return nfs4_proc_unlck(state, cmd, request);
3499
3500         do {
3501                 status = nfs4_proc_setlk(state, cmd, request);
3502                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3503                         break;
3504                 timeout = nfs4_set_lock_task_retry(timeout);
3505                 status = -ERESTARTSYS;
3506                 if (signalled())
3507                         break;
3508         } while(status < 0);
3509         return status;
3510 }
3511
3512 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3513 {
3514         struct nfs_server *server = NFS_SERVER(state->inode);
3515         struct nfs4_exception exception = { };
3516         int err;
3517
3518         err = nfs4_set_lock_state(state, fl);
3519         if (err != 0)
3520                 goto out;
3521         do {
3522                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3523                 if (err != -NFS4ERR_DELAY)
3524                         break;
3525                 err = nfs4_handle_exception(server, err, &exception);
3526         } while (exception.retry);
3527 out:
3528         return err;
3529 }
3530
3531 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3532
3533 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3534                 size_t buflen, int flags)
3535 {
3536         struct inode *inode = dentry->d_inode;
3537
3538         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3539                 return -EOPNOTSUPP;
3540
3541         if (!S_ISREG(inode->i_mode) &&
3542             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3543                 return -EPERM;
3544
3545         return nfs4_proc_set_acl(inode, buf, buflen);
3546 }
3547
3548 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3549  * and that's what we'll do for e.g. user attributes that haven't been set.
3550  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3551  * attributes in kernel-managed attribute namespaces. */
3552 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3553                 size_t buflen)
3554 {
3555         struct inode *inode = dentry->d_inode;
3556
3557         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3558                 return -EOPNOTSUPP;
3559
3560         return nfs4_proc_get_acl(inode, buf, buflen);
3561 }
3562
3563 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3564 {
3565         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3566
3567         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3568                 return 0;
3569         if (buf && buflen < len)
3570                 return -ERANGE;
3571         if (buf)
3572                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3573         return len;
3574 }
3575
3576 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3577                 struct nfs4_fs_locations *fs_locations, struct page *page)
3578 {
3579         struct nfs_server *server = NFS_SERVER(dir);
3580         u32 bitmask[2] = {
3581                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3582                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3583         };
3584         struct nfs4_fs_locations_arg args = {
3585                 .dir_fh = NFS_FH(dir),
3586                 .name = name,
3587                 .page = page,
3588                 .bitmask = bitmask,
3589         };
3590         struct rpc_message msg = {
3591                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3592                 .rpc_argp = &args,
3593                 .rpc_resp = fs_locations,
3594         };
3595         int status;
3596
3597         dprintk("%s: start\n", __FUNCTION__);
3598         nfs_fattr_init(&fs_locations->fattr);
3599         fs_locations->server = server;
3600         fs_locations->nlocations = 0;
3601         status = rpc_call_sync(server->client, &msg, 0);
3602         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3603         return status;
3604 }
3605
3606 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3607         .recover_open   = nfs4_open_reclaim,
3608         .recover_lock   = nfs4_lock_reclaim,
3609 };
3610
3611 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3612         .recover_open   = nfs4_open_expired,
3613         .recover_lock   = nfs4_lock_expired,
3614 };
3615
3616 static const struct inode_operations nfs4_file_inode_operations = {
3617         .permission     = nfs_permission,
3618         .getattr        = nfs_getattr,
3619         .setattr        = nfs_setattr,
3620         .getxattr       = nfs4_getxattr,
3621         .setxattr       = nfs4_setxattr,
3622         .listxattr      = nfs4_listxattr,
3623 };
3624
3625 const struct nfs_rpc_ops nfs_v4_clientops = {
3626         .version        = 4,                    /* protocol version */
3627         .dentry_ops     = &nfs4_dentry_operations,
3628         .dir_inode_ops  = &nfs4_dir_inode_operations,
3629         .file_inode_ops = &nfs4_file_inode_operations,
3630         .getroot        = nfs4_proc_get_root,
3631         .getattr        = nfs4_proc_getattr,
3632         .setattr        = nfs4_proc_setattr,
3633         .lookupfh       = nfs4_proc_lookupfh,
3634         .lookup         = nfs4_proc_lookup,
3635         .access         = nfs4_proc_access,
3636         .readlink       = nfs4_proc_readlink,
3637         .create         = nfs4_proc_create,
3638         .remove         = nfs4_proc_remove,
3639         .unlink_setup   = nfs4_proc_unlink_setup,
3640         .unlink_done    = nfs4_proc_unlink_done,
3641         .rename         = nfs4_proc_rename,
3642         .link           = nfs4_proc_link,
3643         .symlink        = nfs4_proc_symlink,
3644         .mkdir          = nfs4_proc_mkdir,
3645         .rmdir          = nfs4_proc_remove,
3646         .readdir        = nfs4_proc_readdir,
3647         .mknod          = nfs4_proc_mknod,
3648         .statfs         = nfs4_proc_statfs,
3649         .fsinfo         = nfs4_proc_fsinfo,
3650         .pathconf       = nfs4_proc_pathconf,
3651         .set_capabilities = nfs4_server_capabilities,
3652         .decode_dirent  = nfs4_decode_dirent,
3653         .read_setup     = nfs4_proc_read_setup,
3654         .read_done      = nfs4_read_done,
3655         .write_setup    = nfs4_proc_write_setup,
3656         .write_done     = nfs4_write_done,
3657         .commit_setup   = nfs4_proc_commit_setup,
3658         .commit_done    = nfs4_commit_done,
3659         .file_open      = nfs_open,
3660         .file_release   = nfs_release,
3661         .lock           = nfs4_proc_lock,
3662         .clear_acl_cache = nfs4_zap_acl_attr,
3663 };
3664
3665 /*
3666  * Local variables:
3667  *  c-basic-offset: 8
3668  * End:
3669  */