err.no Git - linux-2.6/blob - 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
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 struct nfs4_opendata;
  61 static int _nfs4_proc_open(struct nfs4_opendata *data);
  62 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  63 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  64 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp);
  67 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  68 extern struct rpc_procinfo nfs4_procedures[];
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 124                 struct nfs4_readdir_arg *readdir)
 125 {
 126         u32 *start, *p;
 127
 128         BUG_ON(readdir->count < 80);
 129         if (cookie > 2) {
 130                 readdir->cookie = cookie;
 131                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 132                 return;
 133         }
 134
 135         readdir->cookie = 0;
 136         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 137         if (cookie == 2)
 138                 return;
 139
 140         /*
 141          * NFSv4 servers do not return entries for '.' and '..'
 142          * Therefore, we fake these entries here.  We let '.'
 143          * have cookie 0 and '..' have cookie 1.  Note that
 144          * when talking to the server, we always send cookie 0
 145          * instead of 1 or 2.
 146          */
 147         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 148
 149         if (cookie == 0) {
 150                 *p++ = xdr_one;                                  /* next */
 151                 *p++ = xdr_zero;                   /* cookie, first word */
 152                 *p++ = xdr_one;                   /* cookie, second word */
 153                 *p++ = xdr_one;                             /* entry len */
 154                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 155                 p++;
 156                 *p++ = xdr_one;                         /* bitmap length */
 157                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 158                 *p++ = htonl(8);              /* attribute buffer length */
 159                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 160         }
 161
 162         *p++ = xdr_one;                                  /* next */
 163         *p++ = xdr_zero;                   /* cookie, first word */
 164         *p++ = xdr_two;                   /* cookie, second word */
 165         *p++ = xdr_two;                             /* entry len */
 166         memcpy(p, "..\0\0", 4);                         /* entry */
 167         p++;
 168         *p++ = xdr_one;                         /* bitmap length */
 169         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 170         *p++ = htonl(8);              /* attribute buffer length */
 171         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 172
 173         readdir->pgbase = (char *)p - (char *)start;
 174         readdir->count -= readdir->pgbase;
 175         kunmap_atomic(start, KM_USER0);
 176 }
 177
 178 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 179 {
 180         struct nfs4_client *clp = server->nfs4_state;
 181         spin_lock(&clp->cl_lock);
 182         if (time_before(clp->cl_last_renewal,timestamp))
 183                 clp->cl_last_renewal = timestamp;
 184         spin_unlock(&clp->cl_lock);
 185 }
 186
 187 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 188 {
 189         struct nfs_inode *nfsi = NFS_I(inode);
 190
 191         spin_lock(&inode->i_lock);
 192         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 193         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 194                 nfsi->change_attr = cinfo->after;
 195         spin_unlock(&inode->i_lock);
 196 }
 197
 198 struct nfs4_opendata {
 199         atomic_t count;
 200         struct nfs_openargs o_arg;
 201         struct nfs_openres o_res;
 202         struct nfs_open_confirmargs c_arg;
 203         struct nfs_open_confirmres c_res;
 204         struct nfs_fattr f_attr;
 205         struct nfs_fattr dir_attr;
 206         struct dentry *dentry;
 207         struct dentry *dir;
 208         struct nfs4_state_owner *owner;
 209         struct iattr attrs;
 210         unsigned long timestamp;
 211         int rpc_status;
 212         int cancelled;
 213 };
 214
 215 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 216                 struct nfs4_state_owner *sp, int flags,
 217                 const struct iattr *attrs)
 218 {
 219         struct dentry *parent = dget_parent(dentry);
 220         struct inode *dir = parent->d_inode;
 221         struct nfs_server *server = NFS_SERVER(dir);
 222         struct nfs4_opendata *p;
 223
 224         p = kzalloc(sizeof(*p), GFP_KERNEL);
 225         if (p == NULL)
 226                 goto err;
 227         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 228         if (p->o_arg.seqid == NULL)
 229                 goto err_free;
 230         atomic_set(&p->count, 1);
 231         p->dentry = dget(dentry);
 232         p->dir = parent;
 233         p->owner = sp;
 234         atomic_inc(&sp->so_count);
 235         p->o_arg.fh = NFS_FH(dir);
 236         p->o_arg.open_flags = flags,
 237         p->o_arg.clientid = server->nfs4_state->cl_clientid;
 238         p->o_arg.id = sp->so_id;
 239         p->o_arg.name = &dentry->d_name;
 240         p->o_arg.server = server;
 241         p->o_arg.bitmask = server->attr_bitmask;
 242         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 243         p->o_res.f_attr = &p->f_attr;
 244         p->o_res.dir_attr = &p->dir_attr;
 245         p->o_res.server = server;
 246         nfs_fattr_init(&p->f_attr);
 247         nfs_fattr_init(&p->dir_attr);
 248         if (flags & O_EXCL) {
 249                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 250                 s[0] = jiffies;
 251                 s[1] = current->pid;
 252         } else if (flags & O_CREAT) {
 253                 p->o_arg.u.attrs = &p->attrs;
 254                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 255         }
 256         p->c_arg.fh = &p->o_res.fh;
 257         p->c_arg.stateid = &p->o_res.stateid;
 258         p->c_arg.seqid = p->o_arg.seqid;
 259         return p;
 260 err_free:
 261         kfree(p);
 262 err:
 263         dput(parent);
 264         return NULL;
 265 }
 266
 267 static void nfs4_opendata_free(struct nfs4_opendata *p)
 268 {
 269         if (p != NULL && atomic_dec_and_test(&p->count)) {
 270                 nfs_free_seqid(p->o_arg.seqid);
 271                 nfs4_put_state_owner(p->owner);
 272                 dput(p->dir);
 273                 dput(p->dentry);
 274                 kfree(p);
 275         }
 276 }
 277
 278 /* Helper for asynchronous RPC calls */
 279 static int nfs4_call_async(struct rpc_clnt *clnt,
 280                 const struct rpc_call_ops *tk_ops, void *calldata)
 281 {
 282         struct rpc_task *task;
 283
 284         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 285                 return -ENOMEM;
 286         rpc_execute(task);
 287         return 0;
 288 }
 289
 290 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 291 {
 292         sigset_t oldset;
 293         int ret;
 294
 295         rpc_clnt_sigmask(task->tk_client, &oldset);
 296         ret = rpc_wait_for_completion_task(task);
 297         rpc_clnt_sigunmask(task->tk_client, &oldset);
 298         return ret;
 299 }
 300
 301 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 302 {
 303         switch (open_flags) {
 304                 case FMODE_WRITE:
 305                         state->n_wronly++;
 306                         break;
 307                 case FMODE_READ:
 308                         state->n_rdonly++;
 309                         break;
 310                 case FMODE_READ|FMODE_WRITE:
 311                         state->n_rdwr++;
 312         }
 313 }
 314
 315 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 316 {
 317         struct inode *inode = state->inode;
 318
 319         open_flags &= (FMODE_READ|FMODE_WRITE);
 320         /* Protect against nfs4_find_state_byowner() */
 321         spin_lock(&state->owner->so_lock);
 322         spin_lock(&inode->i_lock);
 323         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 324         update_open_stateflags(state, open_flags);
 325         nfs4_state_set_mode_locked(state, state->state | open_flags);
 326         spin_unlock(&inode->i_lock);
 327         spin_unlock(&state->owner->so_lock);
 328 }
 329
 330 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 331 {
 332         struct inode *inode;
 333         struct nfs4_state *state = NULL;
 334
 335         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 336                 goto out;
 337         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 338         if (inode == NULL)
 339                 goto out;
 340         state = nfs4_get_open_state(inode, data->owner);
 341         if (state == NULL)
 342                 goto put_inode;
 343         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 344 put_inode:
 345         iput(inode);
 346 out:
 347         return state;
 348 }
 349
 350 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 351 {
 352         struct nfs_inode *nfsi = NFS_I(state->inode);
 353         struct nfs_open_context *ctx;
 354
 355         spin_lock(&state->inode->i_lock);
 356         list_for_each_entry(ctx, &nfsi->open_files, list) {
 357                 if (ctx->state != state)
 358                         continue;
 359                 get_nfs_open_context(ctx);
 360                 spin_unlock(&state->inode->i_lock);
 361                 return ctx;
 362         }
 363         spin_unlock(&state->inode->i_lock);
 364         return ERR_PTR(-ENOENT);
 365 }
 366
 367 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 368 {
 369         int ret;
 370
 371         opendata->o_arg.open_flags = openflags;
 372         ret = _nfs4_proc_open(opendata);
 373         if (ret != 0)
 374                 return ret;
 375         memcpy(stateid->data, opendata->o_res.stateid.data,
 376                         sizeof(stateid->data));
 377         return 0;
 378 }
 379
 380 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 381 {
 382         nfs4_stateid stateid;
 383         struct nfs4_state *newstate;
 384         int mode = 0;
 385         int delegation = 0;
 386         int ret;
 387
 388         /* memory barrier prior to reading state->n_* */
 389         smp_rmb();
 390         if (state->n_rdwr != 0) {
 391                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 392                 if (ret != 0)
 393                         return ret;
 394                 mode |= FMODE_READ|FMODE_WRITE;
 395                 if (opendata->o_res.delegation_type != 0)
 396                         delegation = opendata->o_res.delegation_type;
 397                 smp_rmb();
 398         }
 399         if (state->n_wronly != 0) {
 400                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 401                 if (ret != 0)
 402                         return ret;
 403                 mode |= FMODE_WRITE;
 404                 if (opendata->o_res.delegation_type != 0)
 405                         delegation = opendata->o_res.delegation_type;
 406                 smp_rmb();
 407         }
 408         if (state->n_rdonly != 0) {
 409                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 410                 if (ret != 0)
 411                         return ret;
 412                 mode |= FMODE_READ;
 413         }
 414         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 415         if (mode == 0)
 416                 return 0;
 417         if (opendata->o_res.delegation_type == 0)
 418                 opendata->o_res.delegation_type = delegation;
 419         opendata->o_arg.open_flags |= mode;
 420         newstate = nfs4_opendata_to_nfs4_state(opendata);
 421         if (newstate != NULL) {
 422                 if (opendata->o_res.delegation_type != 0) {
 423                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 424                         int delegation_flags = 0;
 425                         if (nfsi->delegation)
 426                                 delegation_flags = nfsi->delegation->flags;
 427                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 428                                 nfs_inode_set_delegation(newstate->inode,
 429                                                 opendata->owner->so_cred,
 430                                                 &opendata->o_res);
 431                         else
 432                                 nfs_inode_reclaim_delegation(newstate->inode,
 433                                                 opendata->owner->so_cred,
 434                                                 &opendata->o_res);
 435                 }
 436                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 437         }
 438         if (newstate != state)
 439                 return -ESTALE;
 440         return 0;
 441 }
 442
 443 /*
 444  * OPEN_RECLAIM:
 445  *      reclaim state on the server after a reboot.
 446  */
 447 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 448 {
 449         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 450         struct nfs4_opendata *opendata;
 451         int delegation_type = 0;
 452         int status;
 453
 454         if (delegation != NULL) {
 455                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 456                         memcpy(&state->stateid, &delegation->stateid,
 457                                         sizeof(state->stateid));
 458                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 459                         return 0;
 460                 }
 461                 delegation_type = delegation->type;
 462         }
 463         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 464         if (opendata == NULL)
 465                 return -ENOMEM;
 466         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 467         opendata->o_arg.fh = NFS_FH(state->inode);
 468         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 469         opendata->o_arg.u.delegation_type = delegation_type;
 470         status = nfs4_open_recover(opendata, state);
 471         nfs4_opendata_free(opendata);
 472         return status;
 473 }
 474
 475 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 476 {
 477         struct nfs_server *server = NFS_SERVER(state->inode);
 478         struct nfs4_exception exception = { };
 479         int err;
 480         do {
 481                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 482                 if (err != -NFS4ERR_DELAY)
 483                         break;
 484                 nfs4_handle_exception(server, err, &exception);
 485         } while (exception.retry);
 486         return err;
 487 }
 488
 489 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 490 {
 491         struct nfs_open_context *ctx;
 492         int ret;
 493
 494         ctx = nfs4_state_find_open_context(state);
 495         if (IS_ERR(ctx))
 496                 return PTR_ERR(ctx);
 497         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 498         put_nfs_open_context(ctx);
 499         return ret;
 500 }
 501
 502 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 503 {
 504         struct nfs4_state_owner  *sp  = state->owner;
 505         struct nfs4_opendata *opendata;
 506         int ret;
 507
 508         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 509                 return 0;
 510         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 511         if (opendata == NULL)
 512                 return -ENOMEM;
 513         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 514         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 515                         sizeof(opendata->o_arg.u.delegation.data));
 516         ret = nfs4_open_recover(opendata, state);
 517         nfs4_opendata_free(opendata);
 518         return ret;
 519 }
 520
 521 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 522 {
 523         struct nfs4_exception exception = { };
 524         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 525         int err;
 526         do {
 527                 err = _nfs4_open_delegation_recall(dentry, state);
 528                 switch (err) {
 529                         case 0:
 530                                 return err;
 531                         case -NFS4ERR_STALE_CLIENTID:
 532                         case -NFS4ERR_STALE_STATEID:
 533                         case -NFS4ERR_EXPIRED:
 534                                 /* Don't recall a delegation if it was lost */
 535                                 nfs4_schedule_state_recovery(server->nfs4_state);
 536                                 return err;
 537                 }
 538                 err = nfs4_handle_exception(server, err, &exception);
 539         } while (exception.retry);
 540         return err;
 541 }
 542
 543 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 544 {
 545         struct nfs4_opendata *data = calldata;
 546         struct  rpc_message msg = {
 547                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 548                 .rpc_argp = &data->c_arg,
 549                 .rpc_resp = &data->c_res,
 550                 .rpc_cred = data->owner->so_cred,
 551         };
 552         data->timestamp = jiffies;
 553         rpc_call_setup(task, &msg, 0);
 554 }
 555
 556 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 557 {
 558         struct nfs4_opendata *data = calldata;
 559
 560         data->rpc_status = task->tk_status;
 561         if (RPC_ASSASSINATED(task))
 562                 return;
 563         if (data->rpc_status == 0) {
 564                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 565                                 sizeof(data->o_res.stateid.data));
 566                 renew_lease(data->o_res.server, data->timestamp);
 567         }
 568         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 569         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 570 }
 571
 572 static void nfs4_open_confirm_release(void *calldata)
 573 {
 574         struct nfs4_opendata *data = calldata;
 575         struct nfs4_state *state = NULL;
 576
 577         /* If this request hasn't been cancelled, do nothing */
 578         if (data->cancelled == 0)
 579                 goto out_free;
 580         /* In case of error, no cleanup! */
 581         if (data->rpc_status != 0)
 582                 goto out_free;
 583         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 584         state = nfs4_opendata_to_nfs4_state(data);
 585         if (state != NULL)
 586                 nfs4_close_state(state, data->o_arg.open_flags);
 587 out_free:
 588         nfs4_opendata_free(data);
 589 }
 590
 591 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 592         .rpc_call_prepare = nfs4_open_confirm_prepare,
 593         .rpc_call_done = nfs4_open_confirm_done,
 594         .rpc_release = nfs4_open_confirm_release,
 595 };
 596
 597 /*
 598  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 599  */
 600 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 601 {
 602         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 603         struct rpc_task *task;
 604         int status;
 605
 606         atomic_inc(&data->count);
 607         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 608         if (IS_ERR(task)) {
 609                 nfs4_opendata_free(data);
 610                 return PTR_ERR(task);
 611         }
 612         status = nfs4_wait_for_completion_rpc_task(task);
 613         if (status != 0) {
 614                 data->cancelled = 1;
 615                 smp_wmb();
 616         } else
 617                 status = data->rpc_status;
 618         rpc_release_task(task);
 619         return status;
 620 }
 621
 622 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 623 {
 624         struct nfs4_opendata *data = calldata;
 625         struct nfs4_state_owner *sp = data->owner;
 626         struct rpc_message msg = {
 627                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 628                 .rpc_argp = &data->o_arg,
 629                 .rpc_resp = &data->o_res,
 630                 .rpc_cred = sp->so_cred,
 631         };
 632
 633         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 634                 return;
 635         /* Update sequence id. */
 636         data->o_arg.id = sp->so_id;
 637         data->o_arg.clientid = sp->so_client->cl_clientid;
 638         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 639                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 640         data->timestamp = jiffies;
 641         rpc_call_setup(task, &msg, 0);
 642 }
 643
 644 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 645 {
 646         struct nfs4_opendata *data = calldata;
 647
 648         data->rpc_status = task->tk_status;
 649         if (RPC_ASSASSINATED(task))
 650                 return;
 651         if (task->tk_status == 0) {
 652                 switch (data->o_res.f_attr->mode & S_IFMT) {
 653                         case S_IFREG:
 654                                 break;
 655                         case S_IFLNK:
 656                                 data->rpc_status = -ELOOP;
 657                                 break;
 658                         case S_IFDIR:
 659                                 data->rpc_status = -EISDIR;
 660                                 break;
 661                         default:
 662                                 data->rpc_status = -ENOTDIR;
 663                 }
 664                 renew_lease(data->o_res.server, data->timestamp);
 665         }
 666         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 667 }
 668
 669 static void nfs4_open_release(void *calldata)
 670 {
 671         struct nfs4_opendata *data = calldata;
 672         struct nfs4_state *state = NULL;
 673
 674         /* If this request hasn't been cancelled, do nothing */
 675         if (data->cancelled == 0)
 676                 goto out_free;
 677         /* In case of error, no cleanup! */
 678         if (data->rpc_status != 0)
 679                 goto out_free;
 680         /* In case we need an open_confirm, no cleanup! */
 681         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 682                 goto out_free;
 683         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 684         state = nfs4_opendata_to_nfs4_state(data);
 685         if (state != NULL)
 686                 nfs4_close_state(state, data->o_arg.open_flags);
 687 out_free:
 688         nfs4_opendata_free(data);
 689 }
 690
 691 static const struct rpc_call_ops nfs4_open_ops = {
 692         .rpc_call_prepare = nfs4_open_prepare,
 693         .rpc_call_done = nfs4_open_done,
 694         .rpc_release = nfs4_open_release,
 695 };
 696
 697 /*
 698  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 699  */
 700 static int _nfs4_proc_open(struct nfs4_opendata *data)
 701 {
 702         struct inode *dir = data->dir->d_inode;
 703         struct nfs_server *server = NFS_SERVER(dir);
 704         struct nfs_openargs *o_arg = &data->o_arg;
 705         struct nfs_openres *o_res = &data->o_res;
 706         struct rpc_task *task;
 707         int status;
 708
 709         atomic_inc(&data->count);
 710         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 711         if (IS_ERR(task)) {
 712                 nfs4_opendata_free(data);
 713                 return PTR_ERR(task);
 714         }
 715         status = nfs4_wait_for_completion_rpc_task(task);
 716         if (status != 0) {
 717                 data->cancelled = 1;
 718                 smp_wmb();
 719         } else
 720                 status = data->rpc_status;
 721         rpc_release_task(task);
 722         if (status != 0)
 723                 return status;
 724
 725         if (o_arg->open_flags & O_CREAT) {
 726                 update_changeattr(dir, &o_res->cinfo);
 727                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 728         } else
 729                 nfs_refresh_inode(dir, o_res->dir_attr);
 730         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 731                 status = _nfs4_proc_open_confirm(data);
 732                 if (status != 0)
 733                         return status;
 734         }
 735         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 736         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 737                 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 738         return 0;
 739 }
 740
 741 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 742 {
 743         struct nfs_access_entry cache;
 744         int mask = 0;
 745         int status;
 746
 747         if (openflags & FMODE_READ)
 748                 mask |= MAY_READ;
 749         if (openflags & FMODE_WRITE)
 750                 mask |= MAY_WRITE;
 751         status = nfs_access_get_cached(inode, cred, &cache);
 752         if (status == 0)
 753                 goto out;
 754
 755         /* Be clever: ask server to check for all possible rights */
 756         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 757         cache.cred = cred;
 758         cache.jiffies = jiffies;
 759         status = _nfs4_proc_access(inode, &cache);
 760         if (status != 0)
 761                 return status;
 762         nfs_access_add_cache(inode, &cache);
 763 out:
 764         if ((cache.mask & mask) == mask)
 765                 return 0;
 766         return -EACCES;
 767 }
 768
 769 int nfs4_recover_expired_lease(struct nfs_server *server)
 770 {
 771         struct nfs4_client *clp = server->nfs4_state;
 772
 773         if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 774                 nfs4_schedule_state_recovery(clp);
 775         return nfs4_wait_clnt_recover(server->client, clp);
 776 }
 777
 778 /*
 779  * OPEN_EXPIRED:
 780  *      reclaim state on the server after a network partition.
 781  *      Assumes caller holds the appropriate lock
 782  */
 783 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 784 {
 785         struct inode *inode = state->inode;
 786         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 787         struct nfs4_opendata *opendata;
 788         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 789         int ret;
 790
 791         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 792                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 793                 if (ret < 0)
 794                         return ret;
 795                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 796                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 797                 return 0;
 798         }
 799         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 800         if (opendata == NULL)
 801                 return -ENOMEM;
 802         ret = nfs4_open_recover(opendata, state);
 803         if (ret == -ESTALE) {
 804                 /* Invalidate the state owner so we don't ever use it again */
 805                 nfs4_drop_state_owner(sp);
 806                 d_drop(dentry);
 807         }
 808         nfs4_opendata_free(opendata);
 809         return ret;
 810 }
 811
 812 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 813 {
 814         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 815         struct nfs4_exception exception = { };
 816         int err;
 817
 818         do {
 819                 err = _nfs4_open_expired(sp, state, dentry);
 820                 if (err == -NFS4ERR_DELAY)
 821                         nfs4_handle_exception(server, err, &exception);
 822         } while (exception.retry);
 823         return err;
 824 }
 825
 826 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 827 {
 828         struct nfs_open_context *ctx;
 829         int ret;
 830
 831         ctx = nfs4_state_find_open_context(state);
 832         if (IS_ERR(ctx))
 833                 return PTR_ERR(ctx);
 834         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 835         put_nfs_open_context(ctx);
 836         return ret;
 837 }
 838
 839 /*
 840  * Returns a referenced nfs4_state if there is an open delegation on the file
 841  */
 842 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 843 {
 844         struct nfs_delegation *delegation;
 845         struct nfs_server *server = NFS_SERVER(inode);
 846         struct nfs4_client *clp = server->nfs4_state;
 847         struct nfs_inode *nfsi = NFS_I(inode);
 848         struct nfs4_state_owner *sp = NULL;
 849         struct nfs4_state *state = NULL;
 850         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 851         int err;
 852
 853         err = nfs4_recover_expired_lease(server);
 854         if (err != 0)
 855                 return err;
 856         /* Protect against reboot recovery - NOTE ORDER! */
 857         down_read(&clp->cl_sem);
 858         /* Protect against delegation recall */
 859         down_read(&nfsi->rwsem);
 860         delegation = NFS_I(inode)->delegation;
 861         err = -ENOENT;
 862         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 863                 goto out_err;
 864         err = -ENOMEM;
 865         if (!(sp = nfs4_get_state_owner(server, cred))) {
 866                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 867                 goto out_err;
 868         }
 869         state = nfs4_get_open_state(inode, sp);
 870         if (state == NULL)
 871                 goto out_err;
 872
 873         err = -ENOENT;
 874         if ((state->state & open_flags) == open_flags) {
 875                 spin_lock(&inode->i_lock);
 876                 update_open_stateflags(state, open_flags);
 877                 spin_unlock(&inode->i_lock);
 878                 goto out_ok;
 879         } else if (state->state != 0)
 880                 goto out_err;
 881
 882         lock_kernel();
 883         err = _nfs4_do_access(inode, cred, open_flags);
 884         unlock_kernel();
 885         if (err != 0)
 886                 goto out_err;
 887         set_bit(NFS_DELEGATED_STATE, &state->flags);
 888         update_open_stateid(state, &delegation->stateid, open_flags);
 889 out_ok:
 890         nfs4_put_state_owner(sp);
 891         up_read(&nfsi->rwsem);
 892         up_read(&clp->cl_sem);
 893         *res = state;
 894         return 0;
 895 out_err:
 896         if (sp != NULL) {
 897                 if (state != NULL)
 898                         nfs4_put_open_state(state);
 899                 nfs4_put_state_owner(sp);
 900         }
 901         up_read(&nfsi->rwsem);
 902         up_read(&clp->cl_sem);
 903         if (err != -EACCES)
 904                 nfs_inode_return_delegation(inode);
 905         return err;
 906 }
 907
 908 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 909 {
 910         struct nfs4_exception exception = { };
 911         struct nfs4_state *res;
 912         int err;
 913
 914         do {
 915                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 916                 if (err == 0)
 917                         break;
 918                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 919                                         err, &exception));
 920         } while (exception.retry);
 921         return res;
 922 }
 923
 924 /*
 925  * Returns a referenced nfs4_state
 926  */
 927 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 928 {
 929         struct nfs4_state_owner  *sp;
 930         struct nfs4_state     *state = NULL;
 931         struct nfs_server       *server = NFS_SERVER(dir);
 932         struct nfs4_client *clp = server->nfs4_state;
 933         struct nfs4_opendata *opendata;
 934         int                     status;
 935
 936         /* Protect against reboot recovery conflicts */
 937         status = -ENOMEM;
 938         if (!(sp = nfs4_get_state_owner(server, cred))) {
 939                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 940                 goto out_err;
 941         }
 942         status = nfs4_recover_expired_lease(server);
 943         if (status != 0)
 944                 goto out_err;
 945         down_read(&clp->cl_sem);
 946         status = -ENOMEM;
 947         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 948         if (opendata == NULL)
 949                 goto err_put_state_owner;
 950
 951         status = _nfs4_proc_open(opendata);
 952         if (status != 0)
 953                 goto err_opendata_free;
 954
 955         status = -ENOMEM;
 956         state = nfs4_opendata_to_nfs4_state(opendata);
 957         if (state == NULL)
 958                 goto err_opendata_free;
 959         if (opendata->o_res.delegation_type != 0)
 960                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 961         nfs4_opendata_free(opendata);
 962         nfs4_put_state_owner(sp);
 963         up_read(&clp->cl_sem);
 964         *res = state;
 965         return 0;
 966 err_opendata_free:
 967         nfs4_opendata_free(opendata);
 968 err_put_state_owner:
 969         nfs4_put_state_owner(sp);
 970 out_err:
 971         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 972         up_read(&clp->cl_sem);
 973         *res = NULL;
 974         return status;
 975 }
 976
 977
 978 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 979 {
 980         struct nfs4_exception exception = { };
 981         struct nfs4_state *res;
 982         int status;
 983
 984         do {
 985                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 986                 if (status == 0)
 987                         break;
 988                 /* NOTE: BAD_SEQID means the server and client disagree about the
 989                  * book-keeping w.r.t. state-changing operations
 990                  * (OPEN/CLOSE/LOCK/LOCKU...)
 991                  * It is actually a sign of a bug on the client or on the server.
 992                  *
 993                  * If we receive a BAD_SEQID error in the particular case of
 994                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 995                  * have unhashed the old state_owner for us, and that we can
 996                  * therefore safely retry using a new one. We should still warn
 997                  * the user though...
 998                  */
 999                 if (status == -NFS4ERR_BAD_SEQID) {
1000                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1001                         exception.retry = 1;
1002                         continue;
1003                 }
1004                 /*
1005                  * BAD_STATEID on OPEN means that the server cancelled our
1006                  * state before it received the OPEN_CONFIRM.
1007                  * Recover by retrying the request as per the discussion
1008                  * on Page 181 of RFC3530.
1009                  */
1010                 if (status == -NFS4ERR_BAD_STATEID) {
1011                         exception.retry = 1;
1012                         continue;
1013                 }
1014                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1015                                         status, &exception));
1016         } while (exception.retry);
1017         return res;
1018 }
1019
1020 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
1021                 struct nfs_fh *fhandle, struct iattr *sattr,
1022                 struct nfs4_state *state)
1023 {
1024         struct nfs_setattrargs  arg = {
1025                 .fh             = fhandle,
1026                 .iap            = sattr,
1027                 .server         = server,
1028                 .bitmask = server->attr_bitmask,
1029         };
1030         struct nfs_setattrres  res = {
1031                 .fattr          = fattr,
1032                 .server         = server,
1033         };
1034         struct rpc_message msg = {
1035                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1036                 .rpc_argp       = &arg,
1037                 .rpc_resp       = &res,
1038         };
1039         unsigned long timestamp = jiffies;
1040         int status;
1041
1042         nfs_fattr_init(fattr);
1043
1044         if (state != NULL) {
1045                 msg.rpc_cred = state->owner->so_cred;
1046                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1047         } else
1048                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1049
1050         status = rpc_call_sync(server->client, &msg, 0);
1051         if (status == 0 && state != NULL)
1052                 renew_lease(server, timestamp);
1053         return status;
1054 }
1055
1056 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
1057                 struct nfs_fh *fhandle, struct iattr *sattr,
1058                 struct nfs4_state *state)
1059 {
1060         struct nfs4_exception exception = { };
1061         int err;
1062         do {
1063                 err = nfs4_handle_exception(server,
1064                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
1065                                         state),
1066                                 &exception);
1067         } while (exception.retry);
1068         return err;
1069 }
1070
1071 struct nfs4_closedata {
1072         struct inode *inode;
1073         struct nfs4_state *state;
1074         struct nfs_closeargs arg;
1075         struct nfs_closeres res;
1076         struct nfs_fattr fattr;
1077         unsigned long timestamp;
1078 };
1079
1080 static void nfs4_free_closedata(void *data)
1081 {
1082         struct nfs4_closedata *calldata = data;
1083         struct nfs4_state_owner *sp = calldata->state->owner;
1084
1085         nfs4_put_open_state(calldata->state);
1086         nfs_free_seqid(calldata->arg.seqid);
1087         nfs4_put_state_owner(sp);
1088         kfree(calldata);
1089 }
1090
1091 static void nfs4_close_done(struct rpc_task *task, void *data)
1092 {
1093         struct nfs4_closedata *calldata = data;
1094         struct nfs4_state *state = calldata->state;
1095         struct nfs_server *server = NFS_SERVER(calldata->inode);
1096
1097         if (RPC_ASSASSINATED(task))
1098                 return;
1099         /* hmm. we are done with the inode, and in the process of freeing
1100          * the state_owner. we keep this around to process errors
1101          */
1102         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1103         switch (task->tk_status) {
1104                 case 0:
1105                         memcpy(&state->stateid, &calldata->res.stateid,
1106                                         sizeof(state->stateid));
1107                         renew_lease(server, calldata->timestamp);
1108                         break;
1109                 case -NFS4ERR_STALE_STATEID:
1110                 case -NFS4ERR_EXPIRED:
1111                         nfs4_schedule_state_recovery(server->nfs4_state);
1112                         break;
1113                 default:
1114                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1115                                 rpc_restart_call(task);
1116                                 return;
1117                         }
1118         }
1119         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1120 }
1121
1122 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1123 {
1124         struct nfs4_closedata *calldata = data;
1125         struct nfs4_state *state = calldata->state;
1126         struct rpc_message msg = {
1127                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1128                 .rpc_argp = &calldata->arg,
1129                 .rpc_resp = &calldata->res,
1130                 .rpc_cred = state->owner->so_cred,
1131         };
1132         int mode = 0, old_mode;
1133
1134         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1135                 return;
1136         /* Recalculate the new open mode in case someone reopened the file
1137          * while we were waiting in line to be scheduled.
1138          */
1139         spin_lock(&state->owner->so_lock);
1140         spin_lock(&calldata->inode->i_lock);
1141         mode = old_mode = state->state;
1142         if (state->n_rdwr == 0) {
1143                 if (state->n_rdonly == 0)
1144                         mode &= ~FMODE_READ;
1145                 if (state->n_wronly == 0)
1146                         mode &= ~FMODE_WRITE;
1147         }
1148         nfs4_state_set_mode_locked(state, mode);
1149         spin_unlock(&calldata->inode->i_lock);
1150         spin_unlock(&state->owner->so_lock);
1151         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1152                 /* Note: exit _without_ calling nfs4_close_done */
1153                 task->tk_action = NULL;
1154                 return;
1155         }
1156         nfs_fattr_init(calldata->res.fattr);
1157         if (mode != 0)
1158                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1159         calldata->arg.open_flags = mode;
1160         calldata->timestamp = jiffies;
1161         rpc_call_setup(task, &msg, 0);
1162 }
1163
1164 static const struct rpc_call_ops nfs4_close_ops = {
1165         .rpc_call_prepare = nfs4_close_prepare,
1166         .rpc_call_done = nfs4_close_done,
1167         .rpc_release = nfs4_free_closedata,
1168 };
1169
1170 /*
1171  * It is possible for data to be read/written from a mem-mapped file
1172  * after the sys_close call (which hits the vfs layer as a flush).
1173  * This means that we can't safely call nfsv4 close on a file until
1174  * the inode is cleared. This in turn means that we are not good
1175  * NFSv4 citizens - we do not indicate to the server to update the file's
1176  * share state even when we are done with one of the three share
1177  * stateid's in the inode.
1178  *
1179  * NOTE: Caller must be holding the sp->so_owner semaphore!
1180  */
1181 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1182 {
1183         struct nfs_server *server = NFS_SERVER(inode);
1184         struct nfs4_closedata *calldata;
1185         int status = -ENOMEM;
1186
1187         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1188         if (calldata == NULL)
1189                 goto out;
1190         calldata->inode = inode;
1191         calldata->state = state;
1192         calldata->arg.fh = NFS_FH(inode);
1193         calldata->arg.stateid = &state->stateid;
1194         /* Serialization for the sequence id */
1195         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1196         if (calldata->arg.seqid == NULL)
1197                 goto out_free_calldata;
1198         calldata->arg.bitmask = server->attr_bitmask;
1199         calldata->res.fattr = &calldata->fattr;
1200         calldata->res.server = server;
1201
1202         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1203         if (status == 0)
1204                 goto out;
1205
1206         nfs_free_seqid(calldata->arg.seqid);
1207 out_free_calldata:
1208         kfree(calldata);
1209 out:
1210         return status;
1211 }
1212
1213 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1214 {
1215         struct file *filp;
1216
1217         filp = lookup_instantiate_filp(nd, dentry, NULL);
1218         if (!IS_ERR(filp)) {
1219                 struct nfs_open_context *ctx;
1220                 ctx = (struct nfs_open_context *)filp->private_data;
1221                 ctx->state = state;
1222         } else
1223                 nfs4_close_state(state, nd->intent.open.flags);
1224 }
1225
1226 struct dentry *
1227 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1228 {
1229         struct iattr attr;
1230         struct rpc_cred *cred;
1231         struct nfs4_state *state;
1232         struct dentry *res;
1233
1234         if (nd->flags & LOOKUP_CREATE) {
1235                 attr.ia_mode = nd->intent.open.create_mode;
1236                 attr.ia_valid = ATTR_MODE;
1237                 if (!IS_POSIXACL(dir))
1238                         attr.ia_mode &= ~current->fs->umask;
1239         } else {
1240                 attr.ia_valid = 0;
1241                 BUG_ON(nd->intent.open.flags & O_CREAT);
1242         }
1243
1244         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1245         if (IS_ERR(cred))
1246                 return (struct dentry *)cred;
1247         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1248         put_rpccred(cred);
1249         if (IS_ERR(state)) {
1250                 if (PTR_ERR(state) == -ENOENT)
1251                         d_add(dentry, NULL);
1252                 return (struct dentry *)state;
1253         }
1254         res = d_add_unique(dentry, igrab(state->inode));
1255         if (res != NULL)
1256                 dentry = res;
1257         nfs4_intent_set_file(nd, dentry, state);
1258         return res;
1259 }
1260
1261 int
1262 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1263 {
1264         struct rpc_cred *cred;
1265         struct nfs4_state *state;
1266
1267         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1268         if (IS_ERR(cred))
1269                 return PTR_ERR(cred);
1270         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1271         if (IS_ERR(state))
1272                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1273         put_rpccred(cred);
1274         if (IS_ERR(state)) {
1275                 switch (PTR_ERR(state)) {
1276                         case -EPERM:
1277                         case -EACCES:
1278                         case -EDQUOT:
1279                         case -ENOSPC:
1280                         case -EROFS:
1281                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1282                                 return 1;
1283                         case -ENOENT:
1284                                 if (dentry->d_inode == NULL)
1285                                         return 1;
1286                 }
1287                 goto out_drop;
1288         }
1289         if (state->inode == dentry->d_inode) {
1290                 nfs4_intent_set_file(nd, dentry, state);
1291                 return 1;
1292         }
1293         nfs4_close_state(state, openflags);
1294 out_drop:
1295         d_drop(dentry);
1296         return 0;
1297 }
1298
1299
1300 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1301 {
1302         struct nfs4_server_caps_res res = {};
1303         struct rpc_message msg = {
1304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1305                 .rpc_argp = fhandle,
1306                 .rpc_resp = &res,
1307         };
1308         int status;
1309
1310         status = rpc_call_sync(server->client, &msg, 0);
1311         if (status == 0) {
1312                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1313                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1314                         server->caps |= NFS_CAP_ACLS;
1315                 if (res.has_links != 0)
1316                         server->caps |= NFS_CAP_HARDLINKS;
1317                 if (res.has_symlinks != 0)
1318                         server->caps |= NFS_CAP_SYMLINKS;
1319                 server->acl_bitmask = res.acl_bitmask;
1320         }
1321         return status;
1322 }
1323
1324 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1325 {
1326         struct nfs4_exception exception = { };
1327         int err;
1328         do {
1329                 err = nfs4_handle_exception(server,
1330                                 _nfs4_server_capabilities(server, fhandle),
1331                                 &exception);
1332         } while (exception.retry);
1333         return err;
1334 }
1335
1336 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1337                 struct nfs_fsinfo *info)
1338 {
1339         struct nfs4_lookup_root_arg args = {
1340                 .bitmask = nfs4_fattr_bitmap,
1341         };
1342         struct nfs4_lookup_res res = {
1343                 .server = server,
1344                 .fattr = info->fattr,
1345                 .fh = fhandle,
1346         };
1347         struct rpc_message msg = {
1348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1349                 .rpc_argp = &args,
1350                 .rpc_resp = &res,
1351         };
1352         nfs_fattr_init(info->fattr);
1353         return rpc_call_sync(server->client, &msg, 0);
1354 }
1355
1356 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1357                 struct nfs_fsinfo *info)
1358 {
1359         struct nfs4_exception exception = { };
1360         int err;
1361         do {
1362                 err = nfs4_handle_exception(server,
1363                                 _nfs4_lookup_root(server, fhandle, info),
1364                                 &exception);
1365         } while (exception.retry);
1366         return err;
1367 }
1368
1369 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1370                 struct nfs_fsinfo *info)
1371 {
1372         struct nfs_fattr *      fattr = info->fattr;
1373         unsigned char *         p;
1374         struct qstr             q;
1375         struct nfs4_lookup_arg args = {
1376                 .dir_fh = fhandle,
1377                 .name = &q,
1378                 .bitmask = nfs4_fattr_bitmap,
1379         };
1380         struct nfs4_lookup_res res = {
1381                 .server = server,
1382                 .fattr = fattr,
1383                 .fh = fhandle,
1384         };
1385         struct rpc_message msg = {
1386                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1387                 .rpc_argp = &args,
1388                 .rpc_resp = &res,
1389         };
1390         int status;
1391
1392         /*
1393          * Now we do a separate LOOKUP for each component of the mount path.
1394          * The LOOKUPs are done separately so that we can conveniently
1395          * catch an ERR_WRONGSEC if it occurs along the way...
1396          */
1397         status = nfs4_lookup_root(server, fhandle, info);
1398         if (status)
1399                 goto out;
1400
1401         p = server->mnt_path;
1402         for (;;) {
1403                 struct nfs4_exception exception = { };
1404
1405                 while (*p == '/')
1406                         p++;
1407                 if (!*p)
1408                         break;
1409                 q.name = p;
1410                 while (*p && (*p != '/'))
1411                         p++;
1412                 q.len = p - q.name;
1413
1414                 do {
1415                         nfs_fattr_init(fattr);
1416                         status = nfs4_handle_exception(server,
1417                                         rpc_call_sync(server->client, &msg, 0),
1418                                         &exception);
1419                 } while (exception.retry);
1420                 if (status == 0)
1421                         continue;
1422                 if (status == -ENOENT) {
1423                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1424                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1425                 }
1426                 break;
1427         }
1428         if (status == 0)
1429                 status = nfs4_server_capabilities(server, fhandle);
1430         if (status == 0)
1431                 status = nfs4_do_fsinfo(server, fhandle, info);
1432 out:
1433         return status;
1434 }
1435
1436 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1437 {
1438         struct nfs4_getattr_arg args = {
1439                 .fh = fhandle,
1440                 .bitmask = server->attr_bitmask,
1441         };
1442         struct nfs4_getattr_res res = {
1443                 .fattr = fattr,
1444                 .server = server,
1445         };
1446         struct rpc_message msg = {
1447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1448                 .rpc_argp = &args,
1449                 .rpc_resp = &res,
1450         };
1451
1452         nfs_fattr_init(fattr);
1453         return rpc_call_sync(server->client, &msg, 0);
1454 }
1455
1456 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1457 {
1458         struct nfs4_exception exception = { };
1459         int err;
1460         do {
1461                 err = nfs4_handle_exception(server,
1462                                 _nfs4_proc_getattr(server, fhandle, fattr),
1463                                 &exception);
1464         } while (exception.retry);
1465         return err;
1466 }
1467
1468 /*
1469  * The file is not closed if it is opened due to the a request to change
1470  * the size of the file. The open call will not be needed once the
1471  * VFS layer lookup-intents are implemented.
1472  *
1473  * Close is called when the inode is destroyed.
1474  * If we haven't opened the file for O_WRONLY, we
1475  * need to in the size_change case to obtain a stateid.
1476  *
1477  * Got race?
1478  * Because OPEN is always done by name in nfsv4, it is
1479  * possible that we opened a different file by the same
1480  * name.  We can recognize this race condition, but we
1481  * can't do anything about it besides returning an error.
1482  *
1483  * This will be fixed with VFS changes (lookup-intent).
1484  */
1485 static int
1486 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1487                   struct iattr *sattr)
1488 {
1489         struct rpc_cred *cred;
1490         struct inode *inode = dentry->d_inode;
1491         struct nfs_open_context *ctx;
1492         struct nfs4_state *state = NULL;
1493         int status;
1494
1495         nfs_fattr_init(fattr);
1496
1497         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1498         if (IS_ERR(cred))
1499                 return PTR_ERR(cred);
1500
1501         /* Search for an existing open(O_WRITE) file */
1502         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1503         if (ctx != NULL)
1504                 state = ctx->state;
1505
1506         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1507                         NFS_FH(inode), sattr, state);
1508         if (status == 0)
1509                 nfs_setattr_update_inode(inode, sattr);
1510         if (ctx != NULL)
1511                 put_nfs_open_context(ctx);
1512         put_rpccred(cred);
1513         return status;
1514 }
1515
1516 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1517                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1518 {
1519         int                    status;
1520         struct nfs_server *server = NFS_SERVER(dir);
1521         struct nfs4_lookup_arg args = {
1522                 .bitmask = server->attr_bitmask,
1523                 .dir_fh = NFS_FH(dir),
1524                 .name = name,
1525         };
1526         struct nfs4_lookup_res res = {
1527                 .server = server,
1528                 .fattr = fattr,
1529                 .fh = fhandle,
1530         };
1531         struct rpc_message msg = {
1532                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1533                 .rpc_argp = &args,
1534                 .rpc_resp = &res,
1535         };
1536
1537         nfs_fattr_init(fattr);
1538
1539         dprintk("NFS call  lookup %s\n", name->name);
1540         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1541         dprintk("NFS reply lookup: %d\n", status);
1542         return status;
1543 }
1544
1545 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1546 {
1547         struct nfs4_exception exception = { };
1548         int err;
1549         do {
1550                 err = nfs4_handle_exception(NFS_SERVER(dir),
1551                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1552                                 &exception);
1553         } while (exception.retry);
1554         return err;
1555 }
1556
1557 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1558 {
1559         struct nfs4_accessargs args = {
1560                 .fh = NFS_FH(inode),
1561         };
1562         struct nfs4_accessres res = { 0 };
1563         struct rpc_message msg = {
1564                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1565                 .rpc_argp = &args,
1566                 .rpc_resp = &res,
1567                 .rpc_cred = entry->cred,
1568         };
1569         int mode = entry->mask;
1570         int status;
1571
1572         /*
1573          * Determine which access bits we want to ask for...
1574          */
1575         if (mode & MAY_READ)
1576                 args.access |= NFS4_ACCESS_READ;
1577         if (S_ISDIR(inode->i_mode)) {
1578                 if (mode & MAY_WRITE)
1579                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1580                 if (mode & MAY_EXEC)
1581                         args.access |= NFS4_ACCESS_LOOKUP;
1582         } else {
1583                 if (mode & MAY_WRITE)
1584                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1585                 if (mode & MAY_EXEC)
1586                         args.access |= NFS4_ACCESS_EXECUTE;
1587         }
1588         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1589         if (!status) {
1590                 entry->mask = 0;
1591                 if (res.access & NFS4_ACCESS_READ)
1592                         entry->mask |= MAY_READ;
1593                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1594                         entry->mask |= MAY_WRITE;
1595                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1596                         entry->mask |= MAY_EXEC;
1597         }
1598         return status;
1599 }
1600
1601 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1602 {
1603         struct nfs4_exception exception = { };
1604         int err;
1605         do {
1606                 err = nfs4_handle_exception(NFS_SERVER(inode),
1607                                 _nfs4_proc_access(inode, entry),
1608                                 &exception);
1609         } while (exception.retry);
1610         return err;
1611 }
1612
1613 /*
1614  * TODO: For the time being, we don't try to get any attributes
1615  * along with any of the zero-copy operations READ, READDIR,
1616  * READLINK, WRITE.
1617  *
1618  * In the case of the first three, we want to put the GETATTR
1619  * after the read-type operation -- this is because it is hard
1620  * to predict the length of a GETATTR response in v4, and thus
1621  * align the READ data correctly.  This means that the GETATTR
1622  * may end up partially falling into the page cache, and we should
1623  * shift it into the 'tail' of the xdr_buf before processing.
1624  * To do this efficiently, we need to know the total length
1625  * of data received, which doesn't seem to be available outside
1626  * of the RPC layer.
1627  *
1628  * In the case of WRITE, we also want to put the GETATTR after
1629  * the operation -- in this case because we want to make sure
1630  * we get the post-operation mtime and size.  This means that
1631  * we can't use xdr_encode_pages() as written: we need a variant
1632  * of it which would leave room in the 'tail' iovec.
1633  *
1634  * Both of these changes to the XDR layer would in fact be quite
1635  * minor, but I decided to leave them for a subsequent patch.
1636  */
1637 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1638                 unsigned int pgbase, unsigned int pglen)
1639 {
1640         struct nfs4_readlink args = {
1641                 .fh       = NFS_FH(inode),
1642                 .pgbase   = pgbase,
1643                 .pglen    = pglen,
1644                 .pages    = &page,
1645         };
1646         struct rpc_message msg = {
1647                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1648                 .rpc_argp = &args,
1649                 .rpc_resp = NULL,
1650         };
1651
1652         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1653 }
1654
1655 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1656                 unsigned int pgbase, unsigned int pglen)
1657 {
1658         struct nfs4_exception exception = { };
1659         int err;
1660         do {
1661                 err = nfs4_handle_exception(NFS_SERVER(inode),
1662                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1663                                 &exception);
1664         } while (exception.retry);
1665         return err;
1666 }
1667
1668 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1669 {
1670         int flags = rdata->flags;
1671         struct inode *inode = rdata->inode;
1672         struct nfs_fattr *fattr = rdata->res.fattr;
1673         struct nfs_server *server = NFS_SERVER(inode);
1674         struct rpc_message msg = {
1675                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1676                 .rpc_argp       = &rdata->args,
1677                 .rpc_resp       = &rdata->res,
1678                 .rpc_cred       = rdata->cred,
1679         };
1680         unsigned long timestamp = jiffies;
1681         int status;
1682
1683         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1684                         (long long) rdata->args.offset);
1685
1686         nfs_fattr_init(fattr);
1687         status = rpc_call_sync(server->client, &msg, flags);
1688         if (!status)
1689                 renew_lease(server, timestamp);
1690         dprintk("NFS reply read: %d\n", status);
1691         return status;
1692 }
1693
1694 static int nfs4_proc_read(struct nfs_read_data *rdata)
1695 {
1696         struct nfs4_exception exception = { };
1697         int err;
1698         do {
1699                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1700                                 _nfs4_proc_read(rdata),
1701                                 &exception);
1702         } while (exception.retry);
1703         return err;
1704 }
1705
1706 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1707 {
1708         int rpcflags = wdata->flags;
1709         struct inode *inode = wdata->inode;
1710         struct nfs_fattr *fattr = wdata->res.fattr;
1711         struct nfs_server *server = NFS_SERVER(inode);
1712         struct rpc_message msg = {
1713                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1714                 .rpc_argp       = &wdata->args,
1715                 .rpc_resp       = &wdata->res,
1716                 .rpc_cred       = wdata->cred,
1717         };
1718         int status;
1719
1720         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1721                         (long long) wdata->args.offset);
1722
1723         wdata->args.bitmask = server->attr_bitmask;
1724         wdata->res.server = server;
1725         wdata->timestamp = jiffies;
1726         nfs_fattr_init(fattr);
1727         status = rpc_call_sync(server->client, &msg, rpcflags);
1728         dprintk("NFS reply write: %d\n", status);
1729         if (status < 0)
1730                 return status;
1731         renew_lease(server, wdata->timestamp);
1732         nfs_post_op_update_inode(inode, fattr);
1733         return wdata->res.count;
1734 }
1735
1736 static int nfs4_proc_write(struct nfs_write_data *wdata)
1737 {
1738         struct nfs4_exception exception = { };
1739         int err;
1740         do {
1741                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1742                                 _nfs4_proc_write(wdata),
1743                                 &exception);
1744         } while (exception.retry);
1745         return err;
1746 }
1747
1748 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1749 {
1750         struct inode *inode = cdata->inode;
1751         struct nfs_fattr *fattr = cdata->res.fattr;
1752         struct nfs_server *server = NFS_SERVER(inode);
1753         struct rpc_message msg = {
1754                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1755                 .rpc_argp       = &cdata->args,
1756                 .rpc_resp       = &cdata->res,
1757                 .rpc_cred       = cdata->cred,
1758         };
1759         int status;
1760
1761         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1762                         (long long) cdata->args.offset);
1763
1764         cdata->args.bitmask = server->attr_bitmask;
1765         cdata->res.server = server;
1766         cdata->timestamp = jiffies;
1767         nfs_fattr_init(fattr);
1768         status = rpc_call_sync(server->client, &msg, 0);
1769         if (status >= 0)
1770                 renew_lease(server, cdata->timestamp);
1771         dprintk("NFS reply commit: %d\n", status);
1772         if (status >= 0)
1773                 nfs_post_op_update_inode(inode, fattr);
1774         return status;
1775 }
1776
1777 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1778 {
1779         struct nfs4_exception exception = { };
1780         int err;
1781         do {
1782                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1783                                 _nfs4_proc_commit(cdata),
1784                                 &exception);
1785         } while (exception.retry);
1786         return err;
1787 }
1788
1789 /*
1790  * Got race?
1791  * We will need to arrange for the VFS layer to provide an atomic open.
1792  * Until then, this create/open method is prone to inefficiency and race
1793  * conditions due to the lookup, create, and open VFS calls from sys_open()
1794  * placed on the wire.
1795  *
1796  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1797  * The file will be opened again in the subsequent VFS open call
1798  * (nfs4_proc_file_open).
1799  *
1800  * The open for read will just hang around to be used by any process that
1801  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1802  */
1803
1804 static int
1805 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1806                  int flags, struct nameidata *nd)
1807 {
1808         struct nfs4_state *state;
1809         struct rpc_cred *cred;
1810         int status = 0;
1811
1812         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1813         if (IS_ERR(cred)) {
1814                 status = PTR_ERR(cred);
1815                 goto out;
1816         }
1817         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1818         put_rpccred(cred);
1819         if (IS_ERR(state)) {
1820                 status = PTR_ERR(state);
1821                 goto out;
1822         }
1823         d_instantiate(dentry, igrab(state->inode));
1824         if (flags & O_EXCL) {
1825                 struct nfs_fattr fattr;
1826                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1827                                      NFS_FH(state->inode), sattr, state);
1828                 if (status == 0)
1829                         nfs_setattr_update_inode(state->inode, sattr);
1830         }
1831         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1832                 nfs4_intent_set_file(nd, dentry, state);
1833         else
1834                 nfs4_close_state(state, flags);
1835 out:
1836         return status;
1837 }
1838
1839 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1840 {
1841         struct nfs_server *server = NFS_SERVER(dir);
1842         struct nfs4_remove_arg args = {
1843                 .fh = NFS_FH(dir),
1844                 .name = name,
1845                 .bitmask = server->attr_bitmask,
1846         };
1847         struct nfs_fattr dir_attr;
1848         struct nfs4_remove_res  res = {
1849                 .server = server,
1850                 .dir_attr = &dir_attr,
1851         };
1852         struct rpc_message msg = {
1853                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1854                 .rpc_argp       = &args,
1855                 .rpc_resp       = &res,
1856         };
1857         int                     status;
1858
1859         nfs_fattr_init(res.dir_attr);
1860         status = rpc_call_sync(server->client, &msg, 0);
1861         if (status == 0) {
1862                 update_changeattr(dir, &res.cinfo);
1863                 nfs_post_op_update_inode(dir, res.dir_attr);
1864         }
1865         return status;
1866 }
1867
1868 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1869 {
1870         struct nfs4_exception exception = { };
1871         int err;
1872         do {
1873                 err = nfs4_handle_exception(NFS_SERVER(dir),
1874                                 _nfs4_proc_remove(dir, name),
1875                                 &exception);
1876         } while (exception.retry);
1877         return err;
1878 }
1879
1880 struct unlink_desc {
1881         struct nfs4_remove_arg  args;
1882         struct nfs4_remove_res  res;
1883         struct nfs_fattr dir_attr;
1884 };
1885
1886 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1887                 struct qstr *name)
1888 {
1889         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1890         struct unlink_desc *up;
1891
1892         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1893         if (!up)
1894                 return -ENOMEM;
1895
1896         up->args.fh = NFS_FH(dir->d_inode);
1897         up->args.name = name;
1898         up->args.bitmask = server->attr_bitmask;
1899         up->res.server = server;
1900         up->res.dir_attr = &up->dir_attr;
1901
1902         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1903         msg->rpc_argp = &up->args;
1904         msg->rpc_resp = &up->res;
1905         return 0;
1906 }
1907
1908 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1909 {
1910         struct rpc_message *msg = &task->tk_msg;
1911         struct unlink_desc *up;
1912
1913         if (msg->rpc_resp != NULL) {
1914                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1915                 update_changeattr(dir->d_inode, &up->res.cinfo);
1916                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1917                 kfree(up);
1918                 msg->rpc_resp = NULL;
1919                 msg->rpc_argp = NULL;
1920         }
1921         return 0;
1922 }
1923
1924 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1925                 struct inode *new_dir, struct qstr *new_name)
1926 {
1927         struct nfs_server *server = NFS_SERVER(old_dir);
1928         struct nfs4_rename_arg arg = {
1929                 .old_dir = NFS_FH(old_dir),
1930                 .new_dir = NFS_FH(new_dir),
1931                 .old_name = old_name,
1932                 .new_name = new_name,
1933                 .bitmask = server->attr_bitmask,
1934         };
1935         struct nfs_fattr old_fattr, new_fattr;
1936         struct nfs4_rename_res res = {
1937                 .server = server,
1938                 .old_fattr = &old_fattr,
1939                 .new_fattr = &new_fattr,
1940         };
1941         struct rpc_message msg = {
1942                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1943                 .rpc_argp = &arg,
1944                 .rpc_resp = &res,
1945         };
1946         int                     status;
1947
1948         nfs_fattr_init(res.old_fattr);
1949         nfs_fattr_init(res.new_fattr);
1950         status = rpc_call_sync(server->client, &msg, 0);
1951
1952         if (!status) {
1953                 update_changeattr(old_dir, &res.old_cinfo);
1954                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1955                 update_changeattr(new_dir, &res.new_cinfo);
1956                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1957         }
1958         return status;
1959 }
1960
1961 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1962                 struct inode *new_dir, struct qstr *new_name)
1963 {
1964         struct nfs4_exception exception = { };
1965         int err;
1966         do {
1967                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1968                                 _nfs4_proc_rename(old_dir, old_name,
1969                                         new_dir, new_name),
1970                                 &exception);
1971         } while (exception.retry);
1972         return err;
1973 }
1974
1975 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1976 {
1977         struct nfs_server *server = NFS_SERVER(inode);
1978         struct nfs4_link_arg arg = {
1979                 .fh     = NFS_FH(inode),
1980                 .dir_fh = NFS_FH(dir),
1981                 .name   = name,
1982                 .bitmask = server->attr_bitmask,
1983         };
1984         struct nfs_fattr fattr, dir_attr;
1985         struct nfs4_link_res res = {
1986                 .server = server,
1987                 .fattr = &fattr,
1988                 .dir_attr = &dir_attr,
1989         };
1990         struct rpc_message msg = {
1991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1992                 .rpc_argp = &arg,
1993                 .rpc_resp = &res,
1994         };
1995         int                     status;
1996
1997         nfs_fattr_init(res.fattr);
1998         nfs_fattr_init(res.dir_attr);
1999         status = rpc_call_sync(server->client, &msg, 0);
2000         if (!status) {
2001                 update_changeattr(dir, &res.cinfo);
2002                 nfs_post_op_update_inode(dir, res.dir_attr);
2003                 nfs_refresh_inode(inode, res.fattr);
2004         }
2005
2006         return status;
2007 }
2008
2009 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2010 {
2011         struct nfs4_exception exception = { };
2012         int err;
2013         do {
2014                 err = nfs4_handle_exception(NFS_SERVER(inode),
2015                                 _nfs4_proc_link(inode, dir, name),
2016                                 &exception);
2017         } while (exception.retry);
2018         return err;
2019 }
2020
2021 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2022                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2023                 struct nfs_fattr *fattr)
2024 {
2025         struct nfs_server *server = NFS_SERVER(dir);
2026         struct nfs_fattr dir_fattr;
2027         struct nfs4_create_arg arg = {
2028                 .dir_fh = NFS_FH(dir),
2029                 .server = server,
2030                 .name = name,
2031                 .attrs = sattr,
2032                 .ftype = NF4LNK,
2033                 .bitmask = server->attr_bitmask,
2034         };
2035         struct nfs4_create_res res = {
2036                 .server = server,
2037                 .fh = fhandle,
2038                 .fattr = fattr,
2039                 .dir_fattr = &dir_fattr,
2040         };
2041         struct rpc_message msg = {
2042                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2043                 .rpc_argp = &arg,
2044                 .rpc_resp = &res,
2045         };
2046         int                     status;
2047
2048         if (path->len > NFS4_MAXPATHLEN)
2049                 return -ENAMETOOLONG;
2050         arg.u.symlink = path;
2051         nfs_fattr_init(fattr);
2052         nfs_fattr_init(&dir_fattr);
2053
2054         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2055         if (!status)
2056                 update_changeattr(dir, &res.dir_cinfo);
2057         nfs_post_op_update_inode(dir, res.dir_fattr);
2058         return status;
2059 }
2060
2061 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2062                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2063                 struct nfs_fattr *fattr)
2064 {
2065         struct nfs4_exception exception = { };
2066         int err;
2067         do {
2068                 err = nfs4_handle_exception(NFS_SERVER(dir),
2069                                 _nfs4_proc_symlink(dir, name, path, sattr,
2070                                         fhandle, fattr),
2071                                 &exception);
2072         } while (exception.retry);
2073         return err;
2074 }
2075
2076 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2077                 struct iattr *sattr)
2078 {
2079         struct nfs_server *server = NFS_SERVER(dir);
2080         struct nfs_fh fhandle;
2081         struct nfs_fattr fattr, dir_fattr;
2082         struct nfs4_create_arg arg = {
2083                 .dir_fh = NFS_FH(dir),
2084                 .server = server,
2085                 .name = &dentry->d_name,
2086                 .attrs = sattr,
2087                 .ftype = NF4DIR,
2088                 .bitmask = server->attr_bitmask,
2089         };
2090         struct nfs4_create_res res = {
2091                 .server = server,
2092                 .fh = &fhandle,
2093                 .fattr = &fattr,
2094                 .dir_fattr = &dir_fattr,
2095         };
2096         struct rpc_message msg = {
2097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2098                 .rpc_argp = &arg,
2099                 .rpc_resp = &res,
2100         };
2101         int                     status;
2102
2103         nfs_fattr_init(&fattr);
2104         nfs_fattr_init(&dir_fattr);
2105
2106         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2107         if (!status) {
2108                 update_changeattr(dir, &res.dir_cinfo);
2109                 nfs_post_op_update_inode(dir, res.dir_fattr);
2110                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2111         }
2112         return status;
2113 }
2114
2115 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2116                 struct iattr *sattr)
2117 {
2118         struct nfs4_exception exception = { };
2119         int err;
2120         do {
2121                 err = nfs4_handle_exception(NFS_SERVER(dir),
2122                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2123                                 &exception);
2124         } while (exception.retry);
2125         return err;
2126 }
2127
2128 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2129                   u64 cookie, struct page *page, unsigned int count, int plus)
2130 {
2131         struct inode            *dir = dentry->d_inode;
2132         struct nfs4_readdir_arg args = {
2133                 .fh = NFS_FH(dir),
2134                 .pages = &page,
2135                 .pgbase = 0,
2136                 .count = count,
2137                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2138         };
2139         struct nfs4_readdir_res res;
2140         struct rpc_message msg = {
2141                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2142                 .rpc_argp = &args,
2143                 .rpc_resp = &res,
2144                 .rpc_cred = cred,
2145         };
2146         int                     status;
2147
2148         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2149                         dentry->d_parent->d_name.name,
2150                         dentry->d_name.name,
2151                         (unsigned long long)cookie);
2152         lock_kernel();
2153         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2154         res.pgbase = args.pgbase;
2155         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2156         if (status == 0)
2157                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2158         unlock_kernel();
2159         dprintk("%s: returns %d\n", __FUNCTION__, status);
2160         return status;
2161 }
2162
2163 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2164                   u64 cookie, struct page *page, unsigned int count, int plus)
2165 {
2166         struct nfs4_exception exception = { };
2167         int err;
2168         do {
2169                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2170                                 _nfs4_proc_readdir(dentry, cred, cookie,
2171                                         page, count, plus),
2172                                 &exception);
2173         } while (exception.retry);
2174         return err;
2175 }
2176
2177 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2178                 struct iattr *sattr, dev_t rdev)
2179 {
2180         struct nfs_server *server = NFS_SERVER(dir);
2181         struct nfs_fh fh;
2182         struct nfs_fattr fattr, dir_fattr;
2183         struct nfs4_create_arg arg = {
2184                 .dir_fh = NFS_FH(dir),
2185                 .server = server,
2186                 .name = &dentry->d_name,
2187                 .attrs = sattr,
2188                 .bitmask = server->attr_bitmask,
2189         };
2190         struct nfs4_create_res res = {
2191                 .server = server,
2192                 .fh = &fh,
2193                 .fattr = &fattr,
2194                 .dir_fattr = &dir_fattr,
2195         };
2196         struct rpc_message msg = {
2197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2198                 .rpc_argp = &arg,
2199                 .rpc_resp = &res,
2200         };
2201         int                     status;
2202         int                     mode = sattr->ia_mode;
2203
2204         nfs_fattr_init(&fattr);
2205         nfs_fattr_init(&dir_fattr);
2206
2207         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2208         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2209         if (S_ISFIFO(mode))
2210                 arg.ftype = NF4FIFO;
2211         else if (S_ISBLK(mode)) {
2212                 arg.ftype = NF4BLK;
2213                 arg.u.device.specdata1 = MAJOR(rdev);
2214                 arg.u.device.specdata2 = MINOR(rdev);
2215         }
2216         else if (S_ISCHR(mode)) {
2217                 arg.ftype = NF4CHR;
2218                 arg.u.device.specdata1 = MAJOR(rdev);
2219                 arg.u.device.specdata2 = MINOR(rdev);
2220         }
2221         else
2222                 arg.ftype = NF4SOCK;
2223
2224         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2225         if (status == 0) {
2226                 update_changeattr(dir, &res.dir_cinfo);
2227                 nfs_post_op_update_inode(dir, res.dir_fattr);
2228                 status = nfs_instantiate(dentry, &fh, &fattr);
2229         }
2230         return status;
2231 }
2232
2233 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2234                 struct iattr *sattr, dev_t rdev)
2235 {
2236         struct nfs4_exception exception = { };
2237         int err;
2238         do {
2239                 err = nfs4_handle_exception(NFS_SERVER(dir),
2240                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2241                                 &exception);
2242         } while (exception.retry);
2243         return err;
2244 }
2245
2246 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2247                  struct nfs_fsstat *fsstat)
2248 {
2249         struct nfs4_statfs_arg args = {
2250                 .fh = fhandle,
2251                 .bitmask = server->attr_bitmask,
2252         };
2253         struct rpc_message msg = {
2254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2255                 .rpc_argp = &args,
2256                 .rpc_resp = fsstat,
2257         };
2258
2259         nfs_fattr_init(fsstat->fattr);
2260         return rpc_call_sync(server->client, &msg, 0);
2261 }
2262
2263 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2264 {
2265         struct nfs4_exception exception = { };
2266         int err;
2267         do {
2268                 err = nfs4_handle_exception(server,
2269                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2270                                 &exception);
2271         } while (exception.retry);
2272         return err;
2273 }
2274
2275 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2276                 struct nfs_fsinfo *fsinfo)
2277 {
2278         struct nfs4_fsinfo_arg args = {
2279                 .fh = fhandle,
2280                 .bitmask = server->attr_bitmask,
2281         };
2282         struct rpc_message msg = {
2283                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2284                 .rpc_argp = &args,
2285                 .rpc_resp = fsinfo,
2286         };
2287
2288         return rpc_call_sync(server->client, &msg, 0);
2289 }
2290
2291 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2292 {
2293         struct nfs4_exception exception = { };
2294         int err;
2295
2296         do {
2297                 err = nfs4_handle_exception(server,
2298                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2299                                 &exception);
2300         } while (exception.retry);
2301         return err;
2302 }
2303
2304 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2305 {
2306         nfs_fattr_init(fsinfo->fattr);
2307         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2308 }
2309
2310 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2311                 struct nfs_pathconf *pathconf)
2312 {
2313         struct nfs4_pathconf_arg args = {
2314                 .fh = fhandle,
2315                 .bitmask = server->attr_bitmask,
2316         };
2317         struct rpc_message msg = {
2318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2319                 .rpc_argp = &args,
2320                 .rpc_resp = pathconf,
2321         };
2322
2323         /* None of the pathconf attributes are mandatory to implement */
2324         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2325                 memset(pathconf, 0, sizeof(*pathconf));
2326                 return 0;
2327         }
2328
2329         nfs_fattr_init(pathconf->fattr);
2330         return rpc_call_sync(server->client, &msg, 0);
2331 }
2332
2333 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2334                 struct nfs_pathconf *pathconf)
2335 {
2336         struct nfs4_exception exception = { };
2337         int err;
2338
2339         do {
2340                 err = nfs4_handle_exception(server,
2341                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2342                                 &exception);
2343         } while (exception.retry);
2344         return err;
2345 }
2346
2347 static void nfs4_read_done(struct rpc_task *task, void *calldata)
2348 {
2349         struct nfs_read_data *data = calldata;
2350         struct inode *inode = data->inode;
2351
2352         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2353                 rpc_restart_call(task);
2354                 return;
2355         }
2356         if (task->tk_status > 0)
2357                 renew_lease(NFS_SERVER(inode), data->timestamp);
2358         /* Call back common NFS readpage processing */
2359         nfs_readpage_result(task, calldata);
2360 }
2361
2362 static const struct rpc_call_ops nfs4_read_ops = {
2363         .rpc_call_done = nfs4_read_done,
2364         .rpc_release = nfs_readdata_release,
2365 };
2366
2367 static void
2368 nfs4_proc_read_setup(struct nfs_read_data *data)
2369 {
2370         struct rpc_task *task = &data->task;
2371         struct rpc_message msg = {
2372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2373                 .rpc_argp = &data->args,
2374                 .rpc_resp = &data->res,
2375                 .rpc_cred = data->cred,
2376         };
2377         struct inode *inode = data->inode;
2378         int flags;
2379
2380         data->timestamp   = jiffies;
2381
2382         /* N.B. Do we need to test? Never called for swapfile inode */
2383         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2384
2385         /* Finalize the task. */
2386         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
2387         rpc_call_setup(task, &msg, 0);
2388 }
2389
2390 static void nfs4_write_done(struct rpc_task *task, void *calldata)
2391 {
2392         struct nfs_write_data *data = calldata;
2393         struct inode *inode = data->inode;
2394
2395         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2396                 rpc_restart_call(task);
2397                 return;
2398         }
2399         if (task->tk_status >= 0) {
2400                 renew_lease(NFS_SERVER(inode), data->timestamp);
2401                 nfs_post_op_update_inode(inode, data->res.fattr);
2402         }
2403         /* Call back common NFS writeback processing */
2404         nfs_writeback_done(task, calldata);
2405 }
2406
2407 static const struct rpc_call_ops nfs4_write_ops = {
2408         .rpc_call_done = nfs4_write_done,
2409         .rpc_release = nfs_writedata_release,
2410 };
2411
2412 static void
2413 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2414 {
2415         struct rpc_task *task = &data->task;
2416         struct rpc_message msg = {
2417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2418                 .rpc_argp = &data->args,
2419                 .rpc_resp = &data->res,
2420                 .rpc_cred = data->cred,
2421         };
2422         struct inode *inode = data->inode;
2423         struct nfs_server *server = NFS_SERVER(inode);
2424         int stable;
2425         int flags;
2426
2427         if (how & FLUSH_STABLE) {
2428                 if (!NFS_I(inode)->ncommit)
2429                         stable = NFS_FILE_SYNC;
2430                 else
2431                         stable = NFS_DATA_SYNC;
2432         } else
2433                 stable = NFS_UNSTABLE;
2434         data->args.stable = stable;
2435         data->args.bitmask = server->attr_bitmask;
2436         data->res.server = server;
2437
2438         data->timestamp   = jiffies;
2439
2440         /* Set the initial flags for the task.  */
2441         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2442
2443         /* Finalize the task. */
2444         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_write_ops, data);
2445         rpc_call_setup(task, &msg, 0);
2446 }
2447
2448 static void nfs4_commit_done(struct rpc_task *task, void *calldata)
2449 {
2450         struct nfs_write_data *data = calldata;
2451         struct inode *inode = data->inode;
2452
2453         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2454                 rpc_restart_call(task);
2455                 return;
2456         }
2457         if (task->tk_status >= 0)
2458                 nfs_post_op_update_inode(inode, data->res.fattr);
2459         /* Call back common NFS writeback processing */
2460         nfs_commit_done(task, calldata);
2461 }
2462
2463 static const struct rpc_call_ops nfs4_commit_ops = {
2464         .rpc_call_done = nfs4_commit_done,
2465         .rpc_release = nfs_commit_release,
2466 };
2467
2468 static void
2469 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2470 {
2471         struct rpc_task *task = &data->task;
2472         struct rpc_message msg = {
2473                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2474                 .rpc_argp = &data->args,
2475                 .rpc_resp = &data->res,
2476                 .rpc_cred = data->cred,
2477         };
2478         struct inode *inode = data->inode;
2479         struct nfs_server *server = NFS_SERVER(inode);
2480         int flags;
2481
2482         data->args.bitmask = server->attr_bitmask;
2483         data->res.server = server;
2484
2485         /* Set the initial flags for the task.  */
2486         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2487
2488         /* Finalize the task. */
2489         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_commit_ops, data);
2490         rpc_call_setup(task, &msg, 0);
2491 }
2492
2493 /*
2494  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2495  * standalone procedure for queueing an asynchronous RENEW.
2496  */
2497 static void nfs4_renew_done(struct rpc_task *task, void *data)
2498 {
2499         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2500         unsigned long timestamp = (unsigned long)data;
2501
2502         if (task->tk_status < 0) {
2503                 switch (task->tk_status) {
2504                         case -NFS4ERR_STALE_CLIENTID:
2505                         case -NFS4ERR_EXPIRED:
2506                         case -NFS4ERR_CB_PATH_DOWN:
2507                                 nfs4_schedule_state_recovery(clp);
2508                 }
2509                 return;
2510         }
2511         spin_lock(&clp->cl_lock);
2512         if (time_before(clp->cl_last_renewal,timestamp))
2513                 clp->cl_last_renewal = timestamp;
2514         spin_unlock(&clp->cl_lock);
2515 }
2516
2517 static const struct rpc_call_ops nfs4_renew_ops = {
2518         .rpc_call_done = nfs4_renew_done,
2519 };
2520
2521 int
2522 nfs4_proc_async_renew(struct nfs4_client *clp)
2523 {
2524         struct rpc_message msg = {
2525                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2526                 .rpc_argp       = clp,
2527                 .rpc_cred       = clp->cl_cred,
2528         };
2529
2530         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2531                         &nfs4_renew_ops, (void *)jiffies);
2532 }
2533
2534 int
2535 nfs4_proc_renew(struct nfs4_client *clp)
2536 {
2537         struct rpc_message msg = {
2538                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2539                 .rpc_argp       = clp,
2540                 .rpc_cred       = clp->cl_cred,
2541         };
2542         unsigned long now = jiffies;
2543         int status;
2544
2545         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2546         if (status < 0)
2547                 return status;
2548         spin_lock(&clp->cl_lock);
2549         if (time_before(clp->cl_last_renewal,now))
2550                 clp->cl_last_renewal = now;
2551         spin_unlock(&clp->cl_lock);
2552         return 0;
2553 }
2554
2555 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2556 {
2557         return (server->caps & NFS_CAP_ACLS)
2558                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2559                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2560 }
2561
2562 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2563  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2564  * the stack.
2565  */
2566 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2567
2568 static void buf_to_pages(const void *buf, size_t buflen,
2569                 struct page **pages, unsigned int *pgbase)
2570 {
2571         const void *p = buf;
2572
2573         *pgbase = offset_in_page(buf);
2574         p -= *pgbase;
2575         while (p < buf + buflen) {
2576                 *(pages++) = virt_to_page(p);
2577                 p += PAGE_CACHE_SIZE;
2578         }
2579 }
2580
2581 struct nfs4_cached_acl {
2582         int cached;
2583         size_t len;
2584         char data[0];
2585 };
2586
2587 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2588 {
2589         struct nfs_inode *nfsi = NFS_I(inode);
2590
2591         spin_lock(&inode->i_lock);
2592         kfree(nfsi->nfs4_acl);
2593         nfsi->nfs4_acl = acl;
2594         spin_unlock(&inode->i_lock);
2595 }
2596
2597 static void nfs4_zap_acl_attr(struct inode *inode)
2598 {
2599         nfs4_set_cached_acl(inode, NULL);
2600 }
2601
2602 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2603 {
2604         struct nfs_inode *nfsi = NFS_I(inode);
2605         struct nfs4_cached_acl *acl;
2606         int ret = -ENOENT;
2607
2608         spin_lock(&inode->i_lock);
2609         acl = nfsi->nfs4_acl;
2610         if (acl == NULL)
2611                 goto out;
2612         if (buf == NULL) /* user is just asking for length */
2613                 goto out_len;
2614         if (acl->cached == 0)
2615                 goto out;
2616         ret = -ERANGE; /* see getxattr(2) man page */
2617         if (acl->len > buflen)
2618                 goto out;
2619         memcpy(buf, acl->data, acl->len);
2620 out_len:
2621         ret = acl->len;
2622 out:
2623         spin_unlock(&inode->i_lock);
2624         return ret;
2625 }
2626
2627 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2628 {
2629         struct nfs4_cached_acl *acl;
2630
2631         if (buf && acl_len <= PAGE_SIZE) {
2632                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2633                 if (acl == NULL)
2634                         goto out;
2635                 acl->cached = 1;
2636                 memcpy(acl->data, buf, acl_len);
2637         } else {
2638                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2639                 if (acl == NULL)
2640                         goto out;
2641                 acl->cached = 0;
2642         }
2643         acl->len = acl_len;
2644 out:
2645         nfs4_set_cached_acl(inode, acl);
2646 }
2647
2648 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2649 {
2650         struct page *pages[NFS4ACL_MAXPAGES];
2651         struct nfs_getaclargs args = {
2652                 .fh = NFS_FH(inode),
2653                 .acl_pages = pages,
2654                 .acl_len = buflen,
2655         };
2656         size_t resp_len = buflen;
2657         void *resp_buf;
2658         struct rpc_message msg = {
2659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2660                 .rpc_argp = &args,
2661                 .rpc_resp = &resp_len,
2662         };
2663         struct page *localpage = NULL;
2664         int ret;
2665
2666         if (buflen < PAGE_SIZE) {
2667                 /* As long as we're doing a round trip to the server anyway,
2668                  * let's be prepared for a page of acl data. */
2669                 localpage = alloc_page(GFP_KERNEL);
2670                 resp_buf = page_address(localpage);
2671                 if (localpage == NULL)
2672                         return -ENOMEM;
2673                 args.acl_pages[0] = localpage;
2674                 args.acl_pgbase = 0;
2675                 resp_len = args.acl_len = PAGE_SIZE;
2676         } else {
2677                 resp_buf = buf;
2678                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2679         }
2680         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2681         if (ret)
2682                 goto out_free;
2683         if (resp_len > args.acl_len)
2684                 nfs4_write_cached_acl(inode, NULL, resp_len);
2685         else
2686                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2687         if (buf) {
2688                 ret = -ERANGE;
2689                 if (resp_len > buflen)
2690                         goto out_free;
2691                 if (localpage)
2692                         memcpy(buf, resp_buf, resp_len);
2693         }
2694         ret = resp_len;
2695 out_free:
2696         if (localpage)
2697                 __free_page(localpage);
2698         return ret;
2699 }
2700
2701 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2702 {
2703         struct nfs_server *server = NFS_SERVER(inode);
2704         int ret;
2705
2706         if (!nfs4_server_supports_acls(server))
2707                 return -EOPNOTSUPP;
2708         ret = nfs_revalidate_inode(server, inode);
2709         if (ret < 0)
2710                 return ret;
2711         ret = nfs4_read_cached_acl(inode, buf, buflen);
2712         if (ret != -ENOENT)
2713                 return ret;
2714         return nfs4_get_acl_uncached(inode, buf, buflen);
2715 }
2716
2717 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2718 {
2719         struct nfs_server *server = NFS_SERVER(inode);
2720         struct page *pages[NFS4ACL_MAXPAGES];
2721         struct nfs_setaclargs arg = {
2722                 .fh             = NFS_FH(inode),
2723                 .acl_pages      = pages,
2724                 .acl_len        = buflen,
2725         };
2726         struct rpc_message msg = {
2727                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2728                 .rpc_argp       = &arg,
2729                 .rpc_resp       = NULL,
2730         };
2731         int ret;
2732
2733         if (!nfs4_server_supports_acls(server))
2734                 return -EOPNOTSUPP;
2735         nfs_inode_return_delegation(inode);
2736         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2737         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2738         if (ret == 0)
2739                 nfs4_write_cached_acl(inode, buf, buflen);
2740         return ret;
2741 }
2742
2743 static int
2744 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2745 {
2746         struct nfs4_client *clp = server->nfs4_state;
2747
2748         if (!clp || task->tk_status >= 0)
2749                 return 0;
2750         switch(task->tk_status) {
2751                 case -NFS4ERR_STALE_CLIENTID:
2752                 case -NFS4ERR_STALE_STATEID:
2753                 case -NFS4ERR_EXPIRED:
2754                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2755                         nfs4_schedule_state_recovery(clp);
2756                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2757                                 rpc_wake_up_task(task);
2758                         task->tk_status = 0;
2759                         return -EAGAIN;
2760                 case -NFS4ERR_GRACE:
2761                 case -NFS4ERR_DELAY:
2762                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2763                         task->tk_status = 0;
2764                         return -EAGAIN;
2765                 case -NFS4ERR_OLD_STATEID:
2766                         task->tk_status = 0;
2767                         return -EAGAIN;
2768         }
2769         task->tk_status = nfs4_map_errors(task->tk_status);
2770         return 0;
2771 }
2772
2773 static int nfs4_wait_bit_interruptible(void *word)
2774 {
2775         if (signal_pending(current))
2776                 return -ERESTARTSYS;
2777         schedule();
2778         return 0;
2779 }
2780
2781 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2782 {
2783         sigset_t oldset;
2784         int res;
2785
2786         might_sleep();
2787
2788         rpc_clnt_sigmask(clnt, &oldset);
2789         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2790                         nfs4_wait_bit_interruptible,
2791                         TASK_INTERRUPTIBLE);
2792         rpc_clnt_sigunmask(clnt, &oldset);
2793         return res;
2794 }
2795
2796 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2797 {
2798         sigset_t oldset;
2799         int res = 0;
2800
2801         might_sleep();
2802
2803         if (*timeout <= 0)
2804                 *timeout = NFS4_POLL_RETRY_MIN;
2805         if (*timeout > NFS4_POLL_RETRY_MAX)
2806                 *timeout = NFS4_POLL_RETRY_MAX;
2807         rpc_clnt_sigmask(clnt, &oldset);
2808         if (clnt->cl_intr) {
2809                 schedule_timeout_interruptible(*timeout);
2810                 if (signalled())
2811                         res = -ERESTARTSYS;
2812         } else
2813                 schedule_timeout_uninterruptible(*timeout);
2814         rpc_clnt_sigunmask(clnt, &oldset);
2815         *timeout <<= 1;
2816         return res;
2817 }
2818
2819 /* This is the error handling routine for processes that are allowed
2820  * to sleep.
2821  */
2822 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2823 {
2824         struct nfs4_client *clp = server->nfs4_state;
2825         int ret = errorcode;
2826
2827         exception->retry = 0;
2828         switch(errorcode) {
2829                 case 0:
2830                         return 0;
2831                 case -NFS4ERR_STALE_CLIENTID:
2832                 case -NFS4ERR_STALE_STATEID:
2833                 case -NFS4ERR_EXPIRED:
2834                         nfs4_schedule_state_recovery(clp);
2835                         ret = nfs4_wait_clnt_recover(server->client, clp);
2836                         if (ret == 0)
2837                                 exception->retry = 1;
2838                         break;
2839                 case -NFS4ERR_GRACE:
2840                 case -NFS4ERR_DELAY:
2841                         ret = nfs4_delay(server->client, &exception->timeout);
2842                         if (ret != 0)
2843                                 break;
2844                 case -NFS4ERR_OLD_STATEID:
2845                         exception->retry = 1;
2846         }
2847         /* We failed to handle the error */
2848         return nfs4_map_errors(ret);
2849 }
2850
2851 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2852 {
2853         nfs4_verifier sc_verifier;
2854         struct nfs4_setclientid setclientid = {
2855                 .sc_verifier = &sc_verifier,
2856                 .sc_prog = program,
2857         };
2858         struct rpc_message msg = {
2859                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2860                 .rpc_argp = &setclientid,
2861                 .rpc_resp = clp,
2862                 .rpc_cred = clp->cl_cred,
2863         };
2864         u32 *p;
2865         int loop = 0;
2866         int status;
2867
2868         p = (u32*)sc_verifier.data;
2869         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2870         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2871
2872         for(;;) {
2873                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2874                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2875                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2876                                 clp->cl_cred->cr_ops->cr_name,
2877                                 clp->cl_id_uniquifier);
2878                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2879                                 sizeof(setclientid.sc_netid), "tcp");
2880                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2881                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2882                                 clp->cl_ipaddr, port >> 8, port & 255);
2883
2884                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2885                 if (status != -NFS4ERR_CLID_INUSE)
2886                         break;
2887                 if (signalled())
2888                         break;
2889                 if (loop++ & 1)
2890                         ssleep(clp->cl_lease_time + 1);
2891                 else
2892                         if (++clp->cl_id_uniquifier == 0)
2893                                 break;
2894         }
2895         return status;
2896 }
2897
2898 int
2899 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2900 {
2901         struct nfs_fsinfo fsinfo;
2902         struct rpc_message msg = {
2903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2904                 .rpc_argp = clp,
2905                 .rpc_resp = &fsinfo,
2906                 .rpc_cred = clp->cl_cred,
2907         };
2908         unsigned long now;
2909         int status;
2910
2911         now = jiffies;
2912         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2913         if (status == 0) {
2914                 spin_lock(&clp->cl_lock);
2915                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2916                 clp->cl_last_renewal = now;
2917                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2918                 spin_unlock(&clp->cl_lock);
2919         }
2920         return status;
2921 }
2922
2923 struct nfs4_delegreturndata {
2924         struct nfs4_delegreturnargs args;
2925         struct nfs_fh fh;
2926         nfs4_stateid stateid;
2927         struct rpc_cred *cred;
2928         unsigned long timestamp;
2929         const struct nfs_server *server;
2930         int rpc_status;
2931 };
2932
2933 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2934 {
2935         struct nfs4_delegreturndata *data = calldata;
2936         struct rpc_message msg = {
2937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2938                 .rpc_argp = &data->args,
2939                 .rpc_cred = data->cred,
2940         };
2941         rpc_call_setup(task, &msg, 0);
2942 }
2943
2944 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2945 {
2946         struct nfs4_delegreturndata *data = calldata;
2947         data->rpc_status = task->tk_status;
2948         if (data->rpc_status == 0)
2949                 renew_lease(data->server, data->timestamp);
2950 }
2951
2952 static void nfs4_delegreturn_release(void *calldata)
2953 {
2954         struct nfs4_delegreturndata *data = calldata;
2955
2956         put_rpccred(data->cred);
2957         kfree(calldata);
2958 }
2959
2960 const static struct rpc_call_ops nfs4_delegreturn_ops = {
2961         .rpc_call_prepare = nfs4_delegreturn_prepare,
2962         .rpc_call_done = nfs4_delegreturn_done,
2963         .rpc_release = nfs4_delegreturn_release,
2964 };
2965
2966 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2967 {
2968         struct nfs4_delegreturndata *data;
2969         struct rpc_task *task;
2970         int status;
2971
2972         data = kmalloc(sizeof(*data), GFP_KERNEL);
2973         if (data == NULL)
2974                 return -ENOMEM;
2975         data->args.fhandle = &data->fh;
2976         data->args.stateid = &data->stateid;
2977         nfs_copy_fh(&data->fh, NFS_FH(inode));
2978         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2979         data->cred = get_rpccred(cred);
2980         data->timestamp = jiffies;
2981         data->server = NFS_SERVER(inode);
2982         data->rpc_status = 0;
2983
2984         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2985         if (IS_ERR(task)) {
2986                 nfs4_delegreturn_release(data);
2987                 return PTR_ERR(task);
2988         }
2989         status = nfs4_wait_for_completion_rpc_task(task);
2990         if (status == 0)
2991                 status = data->rpc_status;
2992         rpc_release_task(task);
2993         return status;
2994 }
2995
2996 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2997 {
2998         struct nfs_server *server = NFS_SERVER(inode);
2999         struct nfs4_exception exception = { };
3000         int err;
3001         do {
3002                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3003                 switch (err) {
3004                         case -NFS4ERR_STALE_STATEID:
3005                         case -NFS4ERR_EXPIRED:
3006                                 nfs4_schedule_state_recovery(server->nfs4_state);
3007                         case 0:
3008                                 return 0;
3009                 }
3010                 err = nfs4_handle_exception(server, err, &exception);
3011         } while (exception.retry);
3012         return err;
3013 }
3014
3015 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3016 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3017
3018 /*
3019  * sleep, with exponential backoff, and retry the LOCK operation.
3020  */
3021 static unsigned long
3022 nfs4_set_lock_task_retry(unsigned long timeout)
3023 {
3024         schedule_timeout_interruptible(timeout);
3025         timeout <<= 1;
3026         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3027                 return NFS4_LOCK_MAXTIMEOUT;
3028         return timeout;
3029 }
3030
3031 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3032 {
3033         struct inode *inode = state->inode;
3034         struct nfs_server *server = NFS_SERVER(inode);
3035         struct nfs4_client *clp = server->nfs4_state;
3036         struct nfs_lockt_args arg = {
3037                 .fh = NFS_FH(inode),
3038                 .fl = request,
3039         };
3040         struct nfs_lockt_res res = {
3041                 .denied = request,
3042         };
3043         struct rpc_message msg = {
3044                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3045                 .rpc_argp       = &arg,
3046                 .rpc_resp       = &res,
3047                 .rpc_cred       = state->owner->so_cred,
3048         };
3049         struct nfs4_lock_state *lsp;
3050         int status;
3051
3052         down_read(&clp->cl_sem);
3053         arg.lock_owner.clientid = clp->cl_clientid;
3054         status = nfs4_set_lock_state(state, request);
3055         if (status != 0)
3056                 goto out;
3057         lsp = request->fl_u.nfs4_fl.owner;
3058         arg.lock_owner.id = lsp->ls_id;
3059         status = rpc_call_sync(server->client, &msg, 0);
3060         switch (status) {
3061                 case 0:
3062                         request->fl_type = F_UNLCK;
3063                         break;
3064                 case -NFS4ERR_DENIED:
3065                         status = 0;
3066         }
3067 out:
3068         up_read(&clp->cl_sem);
3069         return status;
3070 }
3071
3072 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3073 {
3074         struct nfs4_exception exception = { };
3075         int err;
3076
3077         do {
3078                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3079                                 _nfs4_proc_getlk(state, cmd, request),
3080                                 &exception);
3081         } while (exception.retry);
3082         return err;
3083 }
3084
3085 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3086 {
3087         int res = 0;
3088         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3089                 case FL_POSIX:
3090                         res = posix_lock_file_wait(file, fl);
3091                         break;
3092                 case FL_FLOCK:
3093                         res = flock_lock_file_wait(file, fl);
3094                         break;
3095                 default:
3096                         BUG();
3097         }
3098         if (res < 0)
3099                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
3100                                 __FUNCTION__);
3101         return res;
3102 }
3103
3104 struct nfs4_unlockdata {
3105         struct nfs_locku_args arg;
3106         struct nfs_locku_res res;
3107         struct nfs4_lock_state *lsp;
3108         struct nfs_open_context *ctx;
3109         struct file_lock fl;
3110         const struct nfs_server *server;
3111         unsigned long timestamp;
3112 };
3113
3114 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3115                 struct nfs_open_context *ctx,
3116                 struct nfs4_lock_state *lsp,
3117                 struct nfs_seqid *seqid)
3118 {
3119         struct nfs4_unlockdata *p;
3120         struct inode *inode = lsp->ls_state->inode;
3121
3122         p = kmalloc(sizeof(*p), GFP_KERNEL);
3123         if (p == NULL)
3124                 return NULL;
3125         p->arg.fh = NFS_FH(inode);
3126         p->arg.fl = &p->fl;
3127         p->arg.seqid = seqid;
3128         p->arg.stateid = &lsp->ls_stateid;
3129         p->lsp = lsp;
3130         atomic_inc(&lsp->ls_count);
3131         /* Ensure we don't close file until we're done freeing locks! */
3132         p->ctx = get_nfs_open_context(ctx);
3133         memcpy(&p->fl, fl, sizeof(p->fl));
3134         p->server = NFS_SERVER(inode);
3135         return p;
3136 }
3137
3138 static void nfs4_locku_release_calldata(void *data)
3139 {
3140         struct nfs4_unlockdata *calldata = data;
3141         nfs_free_seqid(calldata->arg.seqid);
3142         nfs4_put_lock_state(calldata->lsp);
3143         put_nfs_open_context(calldata->ctx);
3144         kfree(calldata);
3145 }
3146
3147 static void nfs4_locku_done(struct rpc_task *task, void *data)
3148 {
3149         struct nfs4_unlockdata *calldata = data;
3150
3151         if (RPC_ASSASSINATED(task))
3152                 return;
3153         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3154         switch (task->tk_status) {
3155                 case 0:
3156                         memcpy(calldata->lsp->ls_stateid.data,
3157                                         calldata->res.stateid.data,
3158                                         sizeof(calldata->lsp->ls_stateid.data));
3159                         renew_lease(calldata->server, calldata->timestamp);
3160                         break;
3161                 case -NFS4ERR_STALE_STATEID:
3162                 case -NFS4ERR_EXPIRED:
3163                         nfs4_schedule_state_recovery(calldata->server->nfs4_state);
3164                         break;
3165                 default:
3166                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3167                                 rpc_restart_call(task);
3168                         }
3169         }
3170 }
3171
3172 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3173 {
3174         struct nfs4_unlockdata *calldata = data;
3175         struct rpc_message msg = {
3176                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3177                 .rpc_argp       = &calldata->arg,
3178                 .rpc_resp       = &calldata->res,
3179                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3180         };
3181
3182         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3183                 return;
3184         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3185                 /* Note: exit _without_ running nfs4_locku_done */
3186                 task->tk_action = NULL;
3187                 return;
3188         }
3189         calldata->timestamp = jiffies;
3190         rpc_call_setup(task, &msg, 0);
3191 }
3192
3193 static const struct rpc_call_ops nfs4_locku_ops = {
3194         .rpc_call_prepare = nfs4_locku_prepare,
3195         .rpc_call_done = nfs4_locku_done,
3196         .rpc_release = nfs4_locku_release_calldata,
3197 };
3198
3199 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3200                 struct nfs_open_context *ctx,
3201                 struct nfs4_lock_state *lsp,
3202                 struct nfs_seqid *seqid)
3203 {
3204         struct nfs4_unlockdata *data;
3205         struct rpc_task *task;
3206
3207         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3208         if (data == NULL) {
3209                 nfs_free_seqid(seqid);
3210                 return ERR_PTR(-ENOMEM);
3211         }
3212
3213         /* Unlock _before_ we do the RPC call */
3214         do_vfs_lock(fl->fl_file, fl);
3215         task = rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3216         if (IS_ERR(task))
3217                 nfs4_locku_release_calldata(data);
3218         return task;
3219 }
3220
3221 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3222 {
3223         struct nfs_seqid *seqid;
3224         struct nfs4_lock_state *lsp;
3225         struct rpc_task *task;
3226         int status = 0;
3227
3228         /* Is this a delegated lock? */
3229         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3230                 goto out_unlock;
3231         /* Is this open_owner holding any locks on the server? */
3232         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
3233                 goto out_unlock;
3234
3235         status = nfs4_set_lock_state(state, request);
3236         if (status != 0)
3237                 goto out_unlock;
3238         lsp = request->fl_u.nfs4_fl.owner;
3239         status = -ENOMEM;
3240         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3241         if (seqid == NULL)
3242                 goto out_unlock;
3243         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3244         status = PTR_ERR(task);
3245         if (IS_ERR(task))
3246                 goto out_unlock;
3247         status = nfs4_wait_for_completion_rpc_task(task);
3248         rpc_release_task(task);
3249         return status;
3250 out_unlock:
3251         do_vfs_lock(request->fl_file, request);
3252         return status;
3253 }
3254
3255 struct nfs4_lockdata {
3256         struct nfs_lock_args arg;
3257         struct nfs_lock_res res;
3258         struct nfs4_lock_state *lsp;
3259         struct nfs_open_context *ctx;
3260         struct file_lock fl;
3261         unsigned long timestamp;
3262         int rpc_status;
3263         int cancelled;
3264 };
3265
3266 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3267                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3268 {
3269         struct nfs4_lockdata *p;
3270         struct inode *inode = lsp->ls_state->inode;
3271         struct nfs_server *server = NFS_SERVER(inode);
3272
3273         p = kzalloc(sizeof(*p), GFP_KERNEL);
3274         if (p == NULL)
3275                 return NULL;
3276
3277         p->arg.fh = NFS_FH(inode);
3278         p->arg.fl = &p->fl;
3279         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3280         if (p->arg.lock_seqid == NULL)
3281                 goto out_free;
3282         p->arg.lock_stateid = &lsp->ls_stateid;
3283         p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3284         p->arg.lock_owner.id = lsp->ls_id;
3285         p->lsp = lsp;
3286         atomic_inc(&lsp->ls_count);
3287         p->ctx = get_nfs_open_context(ctx);
3288         memcpy(&p->fl, fl, sizeof(p->fl));
3289         return p;
3290 out_free:
3291         kfree(p);
3292         return NULL;
3293 }
3294
3295 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3296 {
3297         struct nfs4_lockdata *data = calldata;
3298         struct nfs4_state *state = data->lsp->ls_state;
3299         struct nfs4_state_owner *sp = state->owner;
3300         struct rpc_message msg = {
3301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3302                 .rpc_argp = &data->arg,
3303                 .rpc_resp = &data->res,
3304                 .rpc_cred = sp->so_cred,
3305         };
3306
3307         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3308                 return;
3309         dprintk("%s: begin!\n", __FUNCTION__);
3310         /* Do we need to do an open_to_lock_owner? */
3311         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3312                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3313                 if (data->arg.open_seqid == NULL) {
3314                         data->rpc_status = -ENOMEM;
3315                         task->tk_action = NULL;
3316                         goto out;
3317                 }
3318                 data->arg.open_stateid = &state->stateid;
3319                 data->arg.new_lock_owner = 1;
3320         }
3321         data->timestamp = jiffies;
3322         rpc_call_setup(task, &msg, 0);
3323 out:
3324         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3325 }
3326
3327 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3328 {
3329         struct nfs4_lockdata *data = calldata;
3330
3331         dprintk("%s: begin!\n", __FUNCTION__);
3332
3333         data->rpc_status = task->tk_status;
3334         if (RPC_ASSASSINATED(task))
3335                 goto out;
3336         if (data->arg.new_lock_owner != 0) {
3337                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3338                 if (data->rpc_status == 0)
3339                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3340                 else
3341                         goto out;
3342         }
3343         if (data->rpc_status == 0) {
3344                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3345                                         sizeof(data->lsp->ls_stateid.data));
3346                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3347                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3348         }
3349         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3350 out:
3351         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3352 }
3353
3354 static void nfs4_lock_release(void *calldata)
3355 {
3356         struct nfs4_lockdata *data = calldata;
3357
3358         dprintk("%s: begin!\n", __FUNCTION__);
3359         if (data->arg.open_seqid != NULL)
3360                 nfs_free_seqid(data->arg.open_seqid);
3361         if (data->cancelled != 0) {
3362                 struct rpc_task *task;
3363                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3364                                 data->arg.lock_seqid);
3365                 if (!IS_ERR(task))
3366                         rpc_release_task(task);
3367                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3368         } else
3369                 nfs_free_seqid(data->arg.lock_seqid);
3370         nfs4_put_lock_state(data->lsp);
3371         put_nfs_open_context(data->ctx);
3372         kfree(data);
3373         dprintk("%s: done!\n", __FUNCTION__);
3374 }
3375
3376 static const struct rpc_call_ops nfs4_lock_ops = {
3377         .rpc_call_prepare = nfs4_lock_prepare,
3378         .rpc_call_done = nfs4_lock_done,
3379         .rpc_release = nfs4_lock_release,
3380 };
3381
3382 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3383 {
3384         struct nfs4_lockdata *data;
3385         struct rpc_task *task;
3386         int ret;
3387
3388         dprintk("%s: begin!\n", __FUNCTION__);
3389         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3390                         fl->fl_u.nfs4_fl.owner);
3391         if (data == NULL)
3392                 return -ENOMEM;
3393         if (IS_SETLKW(cmd))
3394                 data->arg.block = 1;
3395         if (reclaim != 0)
3396                 data->arg.reclaim = 1;
3397         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3398                         &nfs4_lock_ops, data);
3399         if (IS_ERR(task)) {
3400                 nfs4_lock_release(data);
3401                 return PTR_ERR(task);
3402         }
3403         ret = nfs4_wait_for_completion_rpc_task(task);
3404         if (ret == 0) {
3405                 ret = data->rpc_status;
3406                 if (ret == -NFS4ERR_DENIED)
3407                         ret = -EAGAIN;
3408         } else
3409                 data->cancelled = 1;
3410         rpc_release_task(task);
3411         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3412         return ret;
3413 }
3414
3415 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3416 {
3417         struct nfs_server *server = NFS_SERVER(state->inode);
3418         struct nfs4_exception exception = { };
3419         int err;
3420
3421         /* Cache the lock if possible... */
3422         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3423                 return 0;
3424         do {
3425                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3426                 if (err != -NFS4ERR_DELAY)
3427                         break;
3428                 nfs4_handle_exception(server, err, &exception);
3429         } while (exception.retry);
3430         return err;
3431 }
3432
3433 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3434 {
3435         struct nfs_server *server = NFS_SERVER(state->inode);
3436         struct nfs4_exception exception = { };
3437         int err;
3438
3439         err = nfs4_set_lock_state(state, request);
3440         if (err != 0)
3441                 return err;
3442         do {
3443                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3444                 if (err != -NFS4ERR_DELAY)
3445                         break;
3446                 nfs4_handle_exception(server, err, &exception);
3447         } while (exception.retry);
3448         return err;
3449 }
3450
3451 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3452 {
3453         struct nfs4_client *clp = state->owner->so_client;
3454         int status;
3455
3456         /* Is this a delegated open? */
3457         if (NFS_I(state->inode)->delegation_state != 0) {
3458                 /* Yes: cache locks! */
3459                 status = do_vfs_lock(request->fl_file, request);
3460                 /* ...but avoid races with delegation recall... */
3461                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3462                         return status;
3463         }
3464         down_read(&clp->cl_sem);
3465         status = nfs4_set_lock_state(state, request);
3466         if (status != 0)
3467                 goto out;
3468         status = _nfs4_do_setlk(state, cmd, request, 0);
3469         if (status != 0)
3470                 goto out;
3471         /* Note: we always want to sleep here! */
3472         request->fl_flags |= FL_SLEEP;
3473         if (do_vfs_lock(request->fl_file, request) < 0)
3474                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3475 out:
3476         up_read(&clp->cl_sem);
3477         return status;
3478 }
3479
3480 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3481 {
3482         struct nfs4_exception exception = { };
3483         int err;
3484
3485         do {
3486                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3487                                 _nfs4_proc_setlk(state, cmd, request),
3488                                 &exception);
3489         } while (exception.retry);
3490         return err;
3491 }
3492
3493 static int
3494 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3495 {
3496         struct nfs_open_context *ctx;
3497         struct nfs4_state *state;
3498         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3499         int status;
3500
3501         /* verify open state */
3502         ctx = (struct nfs_open_context *)filp->private_data;
3503         state = ctx->state;
3504
3505         if (request->fl_start < 0 || request->fl_end < 0)
3506                 return -EINVAL;
3507
3508         if (IS_GETLK(cmd))
3509                 return nfs4_proc_getlk(state, F_GETLK, request);
3510
3511         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3512                 return -EINVAL;
3513
3514         if (request->fl_type == F_UNLCK)
3515                 return nfs4_proc_unlck(state, cmd, request);
3516
3517         do {
3518                 status = nfs4_proc_setlk(state, cmd, request);
3519                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3520                         break;
3521                 timeout = nfs4_set_lock_task_retry(timeout);
3522                 status = -ERESTARTSYS;
3523                 if (signalled())
3524                         break;
3525         } while(status < 0);
3526         return status;
3527 }
3528
3529 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3530 {
3531         struct nfs_server *server = NFS_SERVER(state->inode);
3532         struct nfs4_exception exception = { };
3533         int err;
3534
3535         err = nfs4_set_lock_state(state, fl);
3536         if (err != 0)
3537                 goto out;
3538         do {
3539                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3540                 if (err != -NFS4ERR_DELAY)
3541                         break;
3542                 err = nfs4_handle_exception(server, err, &exception);
3543         } while (exception.retry);
3544 out:
3545         return err;
3546 }
3547
3548 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3549
3550 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3551                 size_t buflen, int flags)
3552 {
3553         struct inode *inode = dentry->d_inode;
3554
3555         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3556                 return -EOPNOTSUPP;
3557
3558         if (!S_ISREG(inode->i_mode) &&
3559             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3560                 return -EPERM;
3561
3562         return nfs4_proc_set_acl(inode, buf, buflen);
3563 }
3564
3565 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3566  * and that's what we'll do for e.g. user attributes that haven't been set.
3567  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3568  * attributes in kernel-managed attribute namespaces. */
3569 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3570                 size_t buflen)
3571 {
3572         struct inode *inode = dentry->d_inode;
3573
3574         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3575                 return -EOPNOTSUPP;
3576
3577         return nfs4_proc_get_acl(inode, buf, buflen);
3578 }
3579
3580 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3581 {
3582         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3583
3584         if (buf && buflen < len)
3585                 return -ERANGE;
3586         if (buf)
3587                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3588         return len;
3589 }
3590
3591 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3592         .recover_open   = nfs4_open_reclaim,
3593         .recover_lock   = nfs4_lock_reclaim,
3594 };
3595
3596 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3597         .recover_open   = nfs4_open_expired,
3598         .recover_lock   = nfs4_lock_expired,
3599 };
3600
3601 static struct inode_operations nfs4_file_inode_operations = {
3602         .permission     = nfs_permission,
3603         .getattr        = nfs_getattr,
3604         .setattr        = nfs_setattr,
3605         .getxattr       = nfs4_getxattr,
3606         .setxattr       = nfs4_setxattr,
3607         .listxattr      = nfs4_listxattr,
3608 };
3609
3610 struct nfs_rpc_ops      nfs_v4_clientops = {
3611         .version        = 4,                    /* protocol version */
3612         .dentry_ops     = &nfs4_dentry_operations,
3613         .dir_inode_ops  = &nfs4_dir_inode_operations,
3614         .file_inode_ops = &nfs4_file_inode_operations,
3615         .getroot        = nfs4_proc_get_root,
3616         .getattr        = nfs4_proc_getattr,
3617         .setattr        = nfs4_proc_setattr,
3618         .lookup         = nfs4_proc_lookup,
3619         .access         = nfs4_proc_access,
3620         .readlink       = nfs4_proc_readlink,
3621         .read           = nfs4_proc_read,
3622         .write          = nfs4_proc_write,
3623         .commit         = nfs4_proc_commit,
3624         .create         = nfs4_proc_create,
3625         .remove         = nfs4_proc_remove,
3626         .unlink_setup   = nfs4_proc_unlink_setup,
3627         .unlink_done    = nfs4_proc_unlink_done,
3628         .rename         = nfs4_proc_rename,
3629         .link           = nfs4_proc_link,
3630         .symlink        = nfs4_proc_symlink,
3631         .mkdir          = nfs4_proc_mkdir,
3632         .rmdir          = nfs4_proc_remove,
3633         .readdir        = nfs4_proc_readdir,
3634         .mknod          = nfs4_proc_mknod,
3635         .statfs         = nfs4_proc_statfs,
3636         .fsinfo         = nfs4_proc_fsinfo,
3637         .pathconf       = nfs4_proc_pathconf,
3638         .decode_dirent  = nfs4_decode_dirent,
3639         .read_setup     = nfs4_proc_read_setup,
3640         .write_setup    = nfs4_proc_write_setup,
3641         .commit_setup   = nfs4_proc_commit_setup,
3642         .file_open      = nfs_open,
3643         .file_release   = nfs_release,
3644         .lock           = nfs4_proc_lock,
3645         .clear_acl_cache = nfs4_zap_acl_attr,
3646 };
3647
3648 /*
3649  * Local variables:
3650  *  c-basic-offset: 8
3651  * End:
3652  */