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 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
  61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  66 extern struct rpc_procinfo nfs4_procedures[];
  67
  68 /* Prevent leaks of NFSv4 errors into userland */
  69 int nfs4_map_errors(int err)
  70 {
  71         if (err < -1000) {
  72                 dprintk("%s could not handle NFSv4 error %d\n",
  73                                 __FUNCTION__, -err);
  74                 return -EIO;
  75         }
  76         return err;
  77 }
  78
  79 /*
  80  * This is our standard bitmap for GETATTR requests.
  81  */
  82 const u32 nfs4_fattr_bitmap[2] = {
  83         FATTR4_WORD0_TYPE
  84         | FATTR4_WORD0_CHANGE
  85         | FATTR4_WORD0_SIZE
  86         | FATTR4_WORD0_FSID
  87         | FATTR4_WORD0_FILEID,
  88         FATTR4_WORD1_MODE
  89         | FATTR4_WORD1_NUMLINKS
  90         | FATTR4_WORD1_OWNER
  91         | FATTR4_WORD1_OWNER_GROUP
  92         | FATTR4_WORD1_RAWDEV
  93         | FATTR4_WORD1_SPACE_USED
  94         | FATTR4_WORD1_TIME_ACCESS
  95         | FATTR4_WORD1_TIME_METADATA
  96         | FATTR4_WORD1_TIME_MODIFY
  97 };
  98
  99 const u32 nfs4_statfs_bitmap[2] = {
 100         FATTR4_WORD0_FILES_AVAIL
 101         | FATTR4_WORD0_FILES_FREE
 102         | FATTR4_WORD0_FILES_TOTAL,
 103         FATTR4_WORD1_SPACE_AVAIL
 104         | FATTR4_WORD1_SPACE_FREE
 105         | FATTR4_WORD1_SPACE_TOTAL
 106 };
 107
 108 const u32 nfs4_pathconf_bitmap[2] = {
 109         FATTR4_WORD0_MAXLINK
 110         | FATTR4_WORD0_MAXNAME,
 111         0
 112 };
 113
 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 115                         | FATTR4_WORD0_MAXREAD
 116                         | FATTR4_WORD0_MAXWRITE
 117                         | FATTR4_WORD0_LEASE_TIME,
 118                         0
 119 };
 120
 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 122                 struct nfs4_readdir_arg *readdir)
 123 {
 124         u32 *start, *p;
 125
 126         BUG_ON(readdir->count < 80);
 127         if (cookie > 2) {
 128                 readdir->cookie = cookie;
 129                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 130                 return;
 131         }
 132
 133         readdir->cookie = 0;
 134         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 135         if (cookie == 2)
 136                 return;
 137
 138         /*
 139          * NFSv4 servers do not return entries for '.' and '..'
 140          * Therefore, we fake these entries here.  We let '.'
 141          * have cookie 0 and '..' have cookie 1.  Note that
 142          * when talking to the server, we always send cookie 0
 143          * instead of 1 or 2.
 144          */
 145         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 146
 147         if (cookie == 0) {
 148                 *p++ = xdr_one;                                  /* next */
 149                 *p++ = xdr_zero;                   /* cookie, first word */
 150                 *p++ = xdr_one;                   /* cookie, second word */
 151                 *p++ = xdr_one;                             /* entry len */
 152                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 153                 p++;
 154                 *p++ = xdr_one;                         /* bitmap length */
 155                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 156                 *p++ = htonl(8);              /* attribute buffer length */
 157                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 158         }
 159
 160         *p++ = xdr_one;                                  /* next */
 161         *p++ = xdr_zero;                   /* cookie, first word */
 162         *p++ = xdr_two;                   /* cookie, second word */
 163         *p++ = xdr_two;                             /* entry len */
 164         memcpy(p, "..\0\0", 4);                         /* entry */
 165         p++;
 166         *p++ = xdr_one;                         /* bitmap length */
 167         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 168         *p++ = htonl(8);              /* attribute buffer length */
 169         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 170
 171         readdir->pgbase = (char *)p - (char *)start;
 172         readdir->count -= readdir->pgbase;
 173         kunmap_atomic(start, KM_USER0);
 174 }
 175
 176 static void
 177 renew_lease(struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 191                 nfsi->change_attr = cinfo->after;
 192 }
 193
 194 /* Helper for asynchronous RPC calls */
 195 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 196                 rpc_action tk_exit, void *calldata)
 197 {
 198         struct rpc_task *task;
 199
 200         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 201                 return -ENOMEM;
 202
 203         task->tk_calldata = calldata;
 204         task->tk_action = tk_begin;
 205         rpc_execute(task);
 206         return 0;
 207 }
 208
 209 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 210 {
 211         struct inode *inode = state->inode;
 212
 213         open_flags &= (FMODE_READ|FMODE_WRITE);
 214         /* Protect against nfs4_find_state() */
 215         spin_lock(&inode->i_lock);
 216         state->state |= open_flags;
 217         /* NB! List reordering - see the reclaim code for why.  */
 218         if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
 219                 list_move(&state->open_states, &state->owner->so_states);
 220         if (open_flags & FMODE_READ)
 221                 state->nreaders++;
 222         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 223         spin_unlock(&inode->i_lock);
 224 }
 225
 226 /*
 227  * OPEN_RECLAIM:
 228  *      reclaim state on the server after a reboot.
 229  */
 230 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 231 {
 232         struct inode *inode = state->inode;
 233         struct nfs_server *server = NFS_SERVER(inode);
 234         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 235         struct nfs_openargs o_arg = {
 236                 .fh = NFS_FH(inode),
 237                 .id = sp->so_id,
 238                 .open_flags = state->state,
 239                 .clientid = server->nfs4_state->cl_clientid,
 240                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 241                 .bitmask = server->attr_bitmask,
 242         };
 243         struct nfs_openres o_res = {
 244                 .server = server,       /* Grrr */
 245         };
 246         struct rpc_message msg = {
 247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 248                 .rpc_argp       = &o_arg,
 249                 .rpc_resp       = &o_res,
 250                 .rpc_cred       = sp->so_cred,
 251         };
 252         int status;
 253
 254         if (delegation != NULL) {
 255                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 256                         memcpy(&state->stateid, &delegation->stateid,
 257                                         sizeof(state->stateid));
 258                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 259                         return 0;
 260                 }
 261                 o_arg.u.delegation_type = delegation->type;
 262         }
 263         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 264         if (o_arg.seqid == NULL)
 265                 return -ENOMEM;
 266         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 267         /* Confirm the sequence as being established */
 268         nfs_confirm_seqid(&sp->so_seqid, status);
 269         nfs_increment_open_seqid(status, o_arg.seqid);
 270         if (status == 0) {
 271                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 272                 if (o_res.delegation_type != 0) {
 273                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 274                         /* Did the server issue an immediate delegation recall? */
 275                         if (o_res.do_recall)
 276                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 277                 }
 278         }
 279         nfs_free_seqid(o_arg.seqid);
 280         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 281         /* Ensure we update the inode attributes */
 282         NFS_CACHEINV(inode);
 283         return status;
 284 }
 285
 286 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 287 {
 288         struct nfs_server *server = NFS_SERVER(state->inode);
 289         struct nfs4_exception exception = { };
 290         int err;
 291         do {
 292                 err = _nfs4_open_reclaim(sp, state);
 293                 if (err != -NFS4ERR_DELAY)
 294                         break;
 295                 nfs4_handle_exception(server, err, &exception);
 296         } while (exception.retry);
 297         return err;
 298 }
 299
 300 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 301 {
 302         struct nfs4_state_owner  *sp  = state->owner;
 303         struct inode *inode = dentry->d_inode;
 304         struct nfs_server *server = NFS_SERVER(inode);
 305         struct dentry *parent = dget_parent(dentry);
 306         struct nfs_openargs arg = {
 307                 .fh = NFS_FH(parent->d_inode),
 308                 .clientid = server->nfs4_state->cl_clientid,
 309                 .name = &dentry->d_name,
 310                 .id = sp->so_id,
 311                 .server = server,
 312                 .bitmask = server->attr_bitmask,
 313                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 314         };
 315         struct nfs_openres res = {
 316                 .server = server,
 317         };
 318         struct  rpc_message msg = {
 319                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 320                 .rpc_argp       = &arg,
 321                 .rpc_resp       = &res,
 322                 .rpc_cred       = sp->so_cred,
 323         };
 324         int status = 0;
 325
 326         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 327                 goto out;
 328         if (state->state == 0)
 329                 goto out;
 330         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 331         status = -ENOMEM;
 332         if (arg.seqid == NULL)
 333                 goto out;
 334         arg.open_flags = state->state;
 335         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 336         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 337         nfs_increment_open_seqid(status, arg.seqid);
 338         if (status != 0)
 339                 goto out_free;
 340         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 341                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 342                                 sp, &res.stateid, arg.seqid);
 343                 if (status != 0)
 344                         goto out_free;
 345         }
 346         nfs_confirm_seqid(&sp->so_seqid, 0);
 347         if (status >= 0) {
 348                 memcpy(state->stateid.data, res.stateid.data,
 349                                 sizeof(state->stateid.data));
 350                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 351         }
 352 out_free:
 353         nfs_free_seqid(arg.seqid);
 354 out:
 355         dput(parent);
 356         return status;
 357 }
 358
 359 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 360 {
 361         struct nfs4_exception exception = { };
 362         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 363         int err;
 364         do {
 365                 err = _nfs4_open_delegation_recall(dentry, state);
 366                 switch (err) {
 367                         case 0:
 368                                 return err;
 369                         case -NFS4ERR_STALE_CLIENTID:
 370                         case -NFS4ERR_STALE_STATEID:
 371                         case -NFS4ERR_EXPIRED:
 372                                 /* Don't recall a delegation if it was lost */
 373                                 nfs4_schedule_state_recovery(server->nfs4_state);
 374                                 return err;
 375                 }
 376                 err = nfs4_handle_exception(server, err, &exception);
 377         } while (exception.retry);
 378         return err;
 379 }
 380
 381 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
 382 {
 383         struct nfs_open_confirmargs arg = {
 384                 .fh             = fh,
 385                 .seqid          = seqid,
 386                 .stateid        = *stateid,
 387         };
 388         struct nfs_open_confirmres res;
 389         struct  rpc_message msg = {
 390                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 391                 .rpc_argp       = &arg,
 392                 .rpc_resp       = &res,
 393                 .rpc_cred       = sp->so_cred,
 394         };
 395         int status;
 396
 397         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 398         /* Confirm the sequence as being established */
 399         nfs_confirm_seqid(&sp->so_seqid, status);
 400         nfs_increment_open_seqid(status, seqid);
 401         if (status >= 0)
 402                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 403         return status;
 404 }
 405
 406 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 407 {
 408         struct nfs_server *server = NFS_SERVER(dir);
 409         struct rpc_message msg = {
 410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 411                 .rpc_argp = o_arg,
 412                 .rpc_resp = o_res,
 413                 .rpc_cred = sp->so_cred,
 414         };
 415         int status;
 416
 417         /* Update sequence id. The caller must serialize! */
 418         o_arg->id = sp->so_id;
 419         o_arg->clientid = sp->so_client->cl_clientid;
 420
 421         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 422         if (status == 0) {
 423                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 424                 switch (o_res->f_attr->mode & S_IFMT) {
 425                         case S_IFREG:
 426                                 break;
 427                         case S_IFLNK:
 428                                 status = -ELOOP;
 429                                 break;
 430                         case S_IFDIR:
 431                                 status = -EISDIR;
 432                                 break;
 433                         default:
 434                                 status = -ENOTDIR;
 435                 }
 436         }
 437
 438         nfs_increment_open_seqid(status, o_arg->seqid);
 439         if (status != 0)
 440                 goto out;
 441         update_changeattr(dir, &o_res->cinfo);
 442         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 443                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 444                                 sp, &o_res->stateid, o_arg->seqid);
 445                 if (status != 0)
 446                         goto out;
 447         }
 448         nfs_confirm_seqid(&sp->so_seqid, 0);
 449         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 450                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 451 out:
 452         return status;
 453 }
 454
 455 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 456 {
 457         struct nfs_access_entry cache;
 458         int mask = 0;
 459         int status;
 460
 461         if (openflags & FMODE_READ)
 462                 mask |= MAY_READ;
 463         if (openflags & FMODE_WRITE)
 464                 mask |= MAY_WRITE;
 465         status = nfs_access_get_cached(inode, cred, &cache);
 466         if (status == 0)
 467                 goto out;
 468
 469         /* Be clever: ask server to check for all possible rights */
 470         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 471         cache.cred = cred;
 472         cache.jiffies = jiffies;
 473         status = _nfs4_proc_access(inode, &cache);
 474         if (status != 0)
 475                 return status;
 476         nfs_access_add_cache(inode, &cache);
 477 out:
 478         if ((cache.mask & mask) == mask)
 479                 return 0;
 480         return -EACCES;
 481 }
 482
 483 /*
 484  * OPEN_EXPIRED:
 485  *      reclaim state on the server after a network partition.
 486  *      Assumes caller holds the appropriate lock
 487  */
 488 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 489 {
 490         struct dentry *parent = dget_parent(dentry);
 491         struct inode *dir = parent->d_inode;
 492         struct inode *inode = state->inode;
 493         struct nfs_server *server = NFS_SERVER(dir);
 494         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 495         struct nfs_fattr        f_attr = {
 496                 .valid = 0,
 497         };
 498         struct nfs_openargs o_arg = {
 499                 .fh = NFS_FH(dir),
 500                 .open_flags = state->state,
 501                 .name = &dentry->d_name,
 502                 .bitmask = server->attr_bitmask,
 503                 .claim = NFS4_OPEN_CLAIM_NULL,
 504         };
 505         struct nfs_openres o_res = {
 506                 .f_attr = &f_attr,
 507                 .server = server,
 508         };
 509         int status = 0;
 510
 511         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 512                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 513                 if (status < 0)
 514                         goto out;
 515                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 516                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 517                 goto out;
 518         }
 519         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 520         status = -ENOMEM;
 521         if (o_arg.seqid == NULL)
 522                 goto out;
 523         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 524         if (status != 0)
 525                 goto out_nodeleg;
 526         /* Check if files differ */
 527         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 528                 goto out_stale;
 529         /* Has the file handle changed? */
 530         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 531                 /* Verify if the change attributes are the same */
 532                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 533                         goto out_stale;
 534                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 535                         goto out_stale;
 536                 /* Lets just pretend that this is the same file */
 537                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 538                 NFS_I(inode)->fileid = f_attr.fileid;
 539         }
 540         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 541         if (o_res.delegation_type != 0) {
 542                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 543                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 544                 else
 545                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 546         }
 547 out_nodeleg:
 548         nfs_free_seqid(o_arg.seqid);
 549         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 550 out:
 551         dput(parent);
 552         return status;
 553 out_stale:
 554         status = -ESTALE;
 555         /* Invalidate the state owner so we don't ever use it again */
 556         nfs4_drop_state_owner(sp);
 557         d_drop(dentry);
 558         /* Should we be trying to close that stateid? */
 559         goto out_nodeleg;
 560 }
 561
 562 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 563 {
 564         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 565         struct nfs4_exception exception = { };
 566         int err;
 567
 568         do {
 569                 err = _nfs4_open_expired(sp, state, dentry);
 570                 if (err == -NFS4ERR_DELAY)
 571                         nfs4_handle_exception(server, err, &exception);
 572         } while (exception.retry);
 573         return err;
 574 }
 575
 576 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 577 {
 578         struct nfs_inode *nfsi = NFS_I(state->inode);
 579         struct nfs_open_context *ctx;
 580         int status;
 581
 582         spin_lock(&state->inode->i_lock);
 583         list_for_each_entry(ctx, &nfsi->open_files, list) {
 584                 if (ctx->state != state)
 585                         continue;
 586                 get_nfs_open_context(ctx);
 587                 spin_unlock(&state->inode->i_lock);
 588                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 589                 put_nfs_open_context(ctx);
 590                 return status;
 591         }
 592         spin_unlock(&state->inode->i_lock);
 593         return -ENOENT;
 594 }
 595
 596 /*
 597  * Returns an nfs4_state + an extra reference to the inode
 598  */
 599 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 600 {
 601         struct nfs_delegation *delegation;
 602         struct nfs_server *server = NFS_SERVER(inode);
 603         struct nfs4_client *clp = server->nfs4_state;
 604         struct nfs_inode *nfsi = NFS_I(inode);
 605         struct nfs4_state_owner *sp = NULL;
 606         struct nfs4_state *state = NULL;
 607         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 608         int err;
 609
 610         /* Protect against reboot recovery - NOTE ORDER! */
 611         down_read(&clp->cl_sem);
 612         /* Protect against delegation recall */
 613         down_read(&nfsi->rwsem);
 614         delegation = NFS_I(inode)->delegation;
 615         err = -ENOENT;
 616         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 617                 goto out_err;
 618         err = -ENOMEM;
 619         if (!(sp = nfs4_get_state_owner(server, cred))) {
 620                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 621                 goto out_err;
 622         }
 623         state = nfs4_get_open_state(inode, sp);
 624         if (state == NULL)
 625                 goto out_err;
 626
 627         err = -ENOENT;
 628         if ((state->state & open_flags) == open_flags) {
 629                 spin_lock(&inode->i_lock);
 630                 if (open_flags & FMODE_READ)
 631                         state->nreaders++;
 632                 if (open_flags & FMODE_WRITE)
 633                         state->nwriters++;
 634                 spin_unlock(&inode->i_lock);
 635                 goto out_ok;
 636         } else if (state->state != 0)
 637                 goto out_err;
 638
 639         lock_kernel();
 640         err = _nfs4_do_access(inode, cred, open_flags);
 641         unlock_kernel();
 642         if (err != 0)
 643                 goto out_err;
 644         set_bit(NFS_DELEGATED_STATE, &state->flags);
 645         update_open_stateid(state, &delegation->stateid, open_flags);
 646 out_ok:
 647         nfs4_put_state_owner(sp);
 648         up_read(&nfsi->rwsem);
 649         up_read(&clp->cl_sem);
 650         igrab(inode);
 651         *res = state;
 652         return 0;
 653 out_err:
 654         if (sp != NULL) {
 655                 if (state != NULL)
 656                         nfs4_put_open_state(state);
 657                 nfs4_put_state_owner(sp);
 658         }
 659         up_read(&nfsi->rwsem);
 660         up_read(&clp->cl_sem);
 661         if (err != -EACCES)
 662                 nfs_inode_return_delegation(inode);
 663         return err;
 664 }
 665
 666 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 667 {
 668         struct nfs4_exception exception = { };
 669         struct nfs4_state *res;
 670         int err;
 671
 672         do {
 673                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 674                 if (err == 0)
 675                         break;
 676                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 677                                         err, &exception));
 678         } while (exception.retry);
 679         return res;
 680 }
 681
 682 /*
 683  * Returns an nfs4_state + an referenced inode
 684  */
 685 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 686 {
 687         struct nfs4_state_owner  *sp;
 688         struct nfs4_state     *state = NULL;
 689         struct nfs_server       *server = NFS_SERVER(dir);
 690         struct nfs4_client *clp = server->nfs4_state;
 691         struct inode *inode = NULL;
 692         int                     status;
 693         struct nfs_fattr        f_attr = {
 694                 .valid          = 0,
 695         };
 696         struct nfs_openargs o_arg = {
 697                 .fh             = NFS_FH(dir),
 698                 .open_flags     = flags,
 699                 .name           = &dentry->d_name,
 700                 .server         = server,
 701                 .bitmask = server->attr_bitmask,
 702                 .claim = NFS4_OPEN_CLAIM_NULL,
 703         };
 704         struct nfs_openres o_res = {
 705                 .f_attr         = &f_attr,
 706                 .server         = server,
 707         };
 708
 709         /* Protect against reboot recovery conflicts */
 710         down_read(&clp->cl_sem);
 711         status = -ENOMEM;
 712         if (!(sp = nfs4_get_state_owner(server, cred))) {
 713                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 714                 goto out_err;
 715         }
 716         if (flags & O_EXCL) {
 717                 u32 *p = (u32 *) o_arg.u.verifier.data;
 718                 p[0] = jiffies;
 719                 p[1] = current->pid;
 720         } else
 721                 o_arg.u.attrs = sattr;
 722         /* Serialization for the sequence id */
 723
 724         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 725         if (o_arg.seqid == NULL)
 726                 return -ENOMEM;
 727         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 728         if (status != 0)
 729                 goto out_err;
 730
 731         status = -ENOMEM;
 732         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 733         if (!inode)
 734                 goto out_err;
 735         state = nfs4_get_open_state(inode, sp);
 736         if (!state)
 737                 goto out_err;
 738         update_open_stateid(state, &o_res.stateid, flags);
 739         if (o_res.delegation_type != 0)
 740                 nfs_inode_set_delegation(inode, cred, &o_res);
 741         nfs_free_seqid(o_arg.seqid);
 742         nfs4_put_state_owner(sp);
 743         up_read(&clp->cl_sem);
 744         *res = state;
 745         return 0;
 746 out_err:
 747         if (sp != NULL) {
 748                 if (state != NULL)
 749                         nfs4_put_open_state(state);
 750                 nfs_free_seqid(o_arg.seqid);
 751                 nfs4_put_state_owner(sp);
 752         }
 753         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 754         up_read(&clp->cl_sem);
 755         if (inode != NULL)
 756                 iput(inode);
 757         *res = NULL;
 758         return status;
 759 }
 760
 761
 762 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 763 {
 764         struct nfs4_exception exception = { };
 765         struct nfs4_state *res;
 766         int status;
 767
 768         do {
 769                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 770                 if (status == 0)
 771                         break;
 772                 /* NOTE: BAD_SEQID means the server and client disagree about the
 773                  * book-keeping w.r.t. state-changing operations
 774                  * (OPEN/CLOSE/LOCK/LOCKU...)
 775                  * It is actually a sign of a bug on the client or on the server.
 776                  *
 777                  * If we receive a BAD_SEQID error in the particular case of
 778                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 779                  * have unhashed the old state_owner for us, and that we can
 780                  * therefore safely retry using a new one. We should still warn
 781                  * the user though...
 782                  */
 783                 if (status == -NFS4ERR_BAD_SEQID) {
 784                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 785                         exception.retry = 1;
 786                         continue;
 787                 }
 788                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 789                                         status, &exception));
 790         } while (exception.retry);
 791         return res;
 792 }
 793
 794 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 795                 struct nfs_fh *fhandle, struct iattr *sattr,
 796                 struct nfs4_state *state)
 797 {
 798         struct nfs_setattrargs  arg = {
 799                 .fh             = fhandle,
 800                 .iap            = sattr,
 801                 .server         = server,
 802                 .bitmask = server->attr_bitmask,
 803         };
 804         struct nfs_setattrres  res = {
 805                 .fattr          = fattr,
 806                 .server         = server,
 807         };
 808         struct rpc_message msg = {
 809                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 810                 .rpc_argp       = &arg,
 811                 .rpc_resp       = &res,
 812         };
 813         int status;
 814
 815         fattr->valid = 0;
 816
 817         if (state != NULL) {
 818                 msg.rpc_cred = state->owner->so_cred;
 819                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 820         } else
 821                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 822
 823         status = rpc_call_sync(server->client, &msg, 0);
 824         return status;
 825 }
 826
 827 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 828                 struct nfs_fh *fhandle, struct iattr *sattr,
 829                 struct nfs4_state *state)
 830 {
 831         struct nfs4_exception exception = { };
 832         int err;
 833         do {
 834                 err = nfs4_handle_exception(server,
 835                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 836                                         state),
 837                                 &exception);
 838         } while (exception.retry);
 839         return err;
 840 }
 841
 842 struct nfs4_closedata {
 843         struct inode *inode;
 844         struct nfs4_state *state;
 845         struct nfs_closeargs arg;
 846         struct nfs_closeres res;
 847 };
 848
 849 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 850 {
 851         struct nfs4_state *state = calldata->state;
 852         struct nfs4_state_owner *sp = state->owner;
 853
 854         nfs4_put_open_state(calldata->state);
 855         nfs_free_seqid(calldata->arg.seqid);
 856         nfs4_put_state_owner(sp);
 857         kfree(calldata);
 858 }
 859
 860 static void nfs4_close_done(struct rpc_task *task)
 861 {
 862         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 863         struct nfs4_state *state = calldata->state;
 864         struct nfs_server *server = NFS_SERVER(calldata->inode);
 865
 866         /* hmm. we are done with the inode, and in the process of freeing
 867          * the state_owner. we keep this around to process errors
 868          */
 869         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 870         switch (task->tk_status) {
 871                 case 0:
 872                         memcpy(&state->stateid, &calldata->res.stateid,
 873                                         sizeof(state->stateid));
 874                         break;
 875                 case -NFS4ERR_STALE_STATEID:
 876                 case -NFS4ERR_EXPIRED:
 877                         state->state = calldata->arg.open_flags;
 878                         nfs4_schedule_state_recovery(server->nfs4_state);
 879                         break;
 880                 default:
 881                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 882                                 rpc_restart_call(task);
 883                                 return;
 884                         }
 885         }
 886         state->state = calldata->arg.open_flags;
 887         nfs4_free_closedata(calldata);
 888 }
 889
 890 static void nfs4_close_begin(struct rpc_task *task)
 891 {
 892         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 893         struct nfs4_state *state = calldata->state;
 894         struct rpc_message msg = {
 895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 896                 .rpc_argp = &calldata->arg,
 897                 .rpc_resp = &calldata->res,
 898                 .rpc_cred = state->owner->so_cred,
 899         };
 900         int mode = 0;
 901         int status;
 902
 903         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 904         if (status != 0)
 905                 return;
 906         /* Don't reorder reads */
 907         smp_rmb();
 908         /* Recalculate the new open mode in case someone reopened the file
 909          * while we were waiting in line to be scheduled.
 910          */
 911         if (state->nreaders != 0)
 912                 mode |= FMODE_READ;
 913         if (state->nwriters != 0)
 914                 mode |= FMODE_WRITE;
 915         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 916                 state->state = mode;
 917         if (mode == state->state) {
 918                 nfs4_free_closedata(calldata);
 919                 task->tk_exit = NULL;
 920                 rpc_exit(task, 0);
 921                 return;
 922         }
 923         if (mode != 0)
 924                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 925         calldata->arg.open_flags = mode;
 926         rpc_call_setup(task, &msg, 0);
 927 }
 928
 929 /*
 930  * It is possible for data to be read/written from a mem-mapped file
 931  * after the sys_close call (which hits the vfs layer as a flush).
 932  * This means that we can't safely call nfsv4 close on a file until
 933  * the inode is cleared. This in turn means that we are not good
 934  * NFSv4 citizens - we do not indicate to the server to update the file's
 935  * share state even when we are done with one of the three share
 936  * stateid's in the inode.
 937  *
 938  * NOTE: Caller must be holding the sp->so_owner semaphore!
 939  */
 940 int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
 941 {
 942         struct nfs4_closedata *calldata;
 943         int status = -ENOMEM;
 944
 945         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 946         if (calldata == NULL)
 947                 goto out;
 948         calldata->inode = inode;
 949         calldata->state = state;
 950         calldata->arg.fh = NFS_FH(inode);
 951         calldata->arg.stateid = &state->stateid;
 952         /* Serialization for the sequence id */
 953         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 954         if (calldata->arg.seqid == NULL)
 955                 goto out_free_calldata;
 956
 957         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_close_begin,
 958                         nfs4_close_done, calldata);
 959         if (status == 0)
 960                 goto out;
 961
 962         nfs_free_seqid(calldata->arg.seqid);
 963 out_free_calldata:
 964         kfree(calldata);
 965 out:
 966         return status;
 967 }
 968
 969 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 970 {
 971         struct file *filp;
 972
 973         filp = lookup_instantiate_filp(nd, dentry, NULL);
 974         if (!IS_ERR(filp)) {
 975                 struct nfs_open_context *ctx;
 976                 ctx = (struct nfs_open_context *)filp->private_data;
 977                 ctx->state = state;
 978         } else
 979                 nfs4_close_state(state, nd->intent.open.flags);
 980 }
 981
 982 struct dentry *
 983 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 984 {
 985         struct iattr attr;
 986         struct rpc_cred *cred;
 987         struct nfs4_state *state;
 988         struct dentry *res;
 989
 990         if (nd->flags & LOOKUP_CREATE) {
 991                 attr.ia_mode = nd->intent.open.create_mode;
 992                 attr.ia_valid = ATTR_MODE;
 993                 if (!IS_POSIXACL(dir))
 994                         attr.ia_mode &= ~current->fs->umask;
 995         } else {
 996                 attr.ia_valid = 0;
 997                 BUG_ON(nd->intent.open.flags & O_CREAT);
 998         }
 999
1000         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1001         if (IS_ERR(cred))
1002                 return (struct dentry *)cred;
1003         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1004         put_rpccred(cred);
1005         if (IS_ERR(state)) {
1006                 if (PTR_ERR(state) == -ENOENT)
1007                         d_add(dentry, NULL);
1008                 return (struct dentry *)state;
1009         }
1010         res = d_add_unique(dentry, state->inode);
1011         if (res != NULL)
1012                 dentry = res;
1013         nfs4_intent_set_file(nd, dentry, state);
1014         return res;
1015 }
1016
1017 int
1018 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1019 {
1020         struct rpc_cred *cred;
1021         struct nfs4_state *state;
1022         struct inode *inode;
1023
1024         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1025         if (IS_ERR(cred))
1026                 return PTR_ERR(cred);
1027         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1028         if (IS_ERR(state))
1029                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1030         put_rpccred(cred);
1031         if (IS_ERR(state)) {
1032                 switch (PTR_ERR(state)) {
1033                         case -EPERM:
1034                         case -EACCES:
1035                         case -EDQUOT:
1036                         case -ENOSPC:
1037                         case -EROFS:
1038                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1039                                 return 1;
1040                         case -ENOENT:
1041                                 if (dentry->d_inode == NULL)
1042                                         return 1;
1043                 }
1044                 goto out_drop;
1045         }
1046         inode = state->inode;
1047         iput(inode);
1048         if (inode == dentry->d_inode) {
1049                 nfs4_intent_set_file(nd, dentry, state);
1050                 return 1;
1051         }
1052         nfs4_close_state(state, openflags);
1053 out_drop:
1054         d_drop(dentry);
1055         return 0;
1056 }
1057
1058
1059 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1060 {
1061         struct nfs4_server_caps_res res = {};
1062         struct rpc_message msg = {
1063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1064                 .rpc_argp = fhandle,
1065                 .rpc_resp = &res,
1066         };
1067         int status;
1068
1069         status = rpc_call_sync(server->client, &msg, 0);
1070         if (status == 0) {
1071                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1072                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1073                         server->caps |= NFS_CAP_ACLS;
1074                 if (res.has_links != 0)
1075                         server->caps |= NFS_CAP_HARDLINKS;
1076                 if (res.has_symlinks != 0)
1077                         server->caps |= NFS_CAP_SYMLINKS;
1078                 server->acl_bitmask = res.acl_bitmask;
1079         }
1080         return status;
1081 }
1082
1083 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1084 {
1085         struct nfs4_exception exception = { };
1086         int err;
1087         do {
1088                 err = nfs4_handle_exception(server,
1089                                 _nfs4_server_capabilities(server, fhandle),
1090                                 &exception);
1091         } while (exception.retry);
1092         return err;
1093 }
1094
1095 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1096                 struct nfs_fsinfo *info)
1097 {
1098         struct nfs_fattr *      fattr = info->fattr;
1099         struct nfs4_lookup_root_arg args = {
1100                 .bitmask = nfs4_fattr_bitmap,
1101         };
1102         struct nfs4_lookup_res res = {
1103                 .server = server,
1104                 .fattr = fattr,
1105                 .fh = fhandle,
1106         };
1107         struct rpc_message msg = {
1108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1109                 .rpc_argp = &args,
1110                 .rpc_resp = &res,
1111         };
1112         fattr->valid = 0;
1113         return rpc_call_sync(server->client, &msg, 0);
1114 }
1115
1116 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1117                 struct nfs_fsinfo *info)
1118 {
1119         struct nfs4_exception exception = { };
1120         int err;
1121         do {
1122                 err = nfs4_handle_exception(server,
1123                                 _nfs4_lookup_root(server, fhandle, info),
1124                                 &exception);
1125         } while (exception.retry);
1126         return err;
1127 }
1128
1129 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1130                 struct nfs_fsinfo *info)
1131 {
1132         struct nfs_fattr *      fattr = info->fattr;
1133         unsigned char *         p;
1134         struct qstr             q;
1135         struct nfs4_lookup_arg args = {
1136                 .dir_fh = fhandle,
1137                 .name = &q,
1138                 .bitmask = nfs4_fattr_bitmap,
1139         };
1140         struct nfs4_lookup_res res = {
1141                 .server = server,
1142                 .fattr = fattr,
1143                 .fh = fhandle,
1144         };
1145         struct rpc_message msg = {
1146                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1147                 .rpc_argp = &args,
1148                 .rpc_resp = &res,
1149         };
1150         int status;
1151
1152         /*
1153          * Now we do a separate LOOKUP for each component of the mount path.
1154          * The LOOKUPs are done separately so that we can conveniently
1155          * catch an ERR_WRONGSEC if it occurs along the way...
1156          */
1157         status = nfs4_lookup_root(server, fhandle, info);
1158         if (status)
1159                 goto out;
1160
1161         p = server->mnt_path;
1162         for (;;) {
1163                 struct nfs4_exception exception = { };
1164
1165                 while (*p == '/')
1166                         p++;
1167                 if (!*p)
1168                         break;
1169                 q.name = p;
1170                 while (*p && (*p != '/'))
1171                         p++;
1172                 q.len = p - q.name;
1173
1174                 do {
1175                         fattr->valid = 0;
1176                         status = nfs4_handle_exception(server,
1177                                         rpc_call_sync(server->client, &msg, 0),
1178                                         &exception);
1179                 } while (exception.retry);
1180                 if (status == 0)
1181                         continue;
1182                 if (status == -ENOENT) {
1183                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1184                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1185                 }
1186                 break;
1187         }
1188         if (status == 0)
1189                 status = nfs4_server_capabilities(server, fhandle);
1190         if (status == 0)
1191                 status = nfs4_do_fsinfo(server, fhandle, info);
1192 out:
1193         return status;
1194 }
1195
1196 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1197 {
1198         struct nfs4_getattr_arg args = {
1199                 .fh = fhandle,
1200                 .bitmask = server->attr_bitmask,
1201         };
1202         struct nfs4_getattr_res res = {
1203                 .fattr = fattr,
1204                 .server = server,
1205         };
1206         struct rpc_message msg = {
1207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1208                 .rpc_argp = &args,
1209                 .rpc_resp = &res,
1210         };
1211
1212         fattr->valid = 0;
1213         return rpc_call_sync(server->client, &msg, 0);
1214 }
1215
1216 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1217 {
1218         struct nfs4_exception exception = { };
1219         int err;
1220         do {
1221                 err = nfs4_handle_exception(server,
1222                                 _nfs4_proc_getattr(server, fhandle, fattr),
1223                                 &exception);
1224         } while (exception.retry);
1225         return err;
1226 }
1227
1228 /*
1229  * The file is not closed if it is opened due to the a request to change
1230  * the size of the file. The open call will not be needed once the
1231  * VFS layer lookup-intents are implemented.
1232  *
1233  * Close is called when the inode is destroyed.
1234  * If we haven't opened the file for O_WRONLY, we
1235  * need to in the size_change case to obtain a stateid.
1236  *
1237  * Got race?
1238  * Because OPEN is always done by name in nfsv4, it is
1239  * possible that we opened a different file by the same
1240  * name.  We can recognize this race condition, but we
1241  * can't do anything about it besides returning an error.
1242  *
1243  * This will be fixed with VFS changes (lookup-intent).
1244  */
1245 static int
1246 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1247                   struct iattr *sattr)
1248 {
1249         struct rpc_cred *cred;
1250         struct inode *inode = dentry->d_inode;
1251         struct nfs4_state *state;
1252         int status;
1253
1254         fattr->valid = 0;
1255
1256         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1257         if (IS_ERR(cred))
1258                 return PTR_ERR(cred);
1259         /* Search for an existing WRITE delegation first */
1260         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1261         if (!IS_ERR(state)) {
1262                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1263                 iput(inode);
1264         } else {
1265                 /* Search for an existing open(O_WRITE) stateid */
1266                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1267         }
1268
1269         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1270                         NFS_FH(inode), sattr, state);
1271         if (status == 0)
1272                 nfs_setattr_update_inode(inode, sattr);
1273         if (state != NULL)
1274                 nfs4_close_state(state, FMODE_WRITE);
1275         put_rpccred(cred);
1276         return status;
1277 }
1278
1279 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1280                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1281 {
1282         int                    status;
1283         struct nfs_server *server = NFS_SERVER(dir);
1284         struct nfs4_lookup_arg args = {
1285                 .bitmask = server->attr_bitmask,
1286                 .dir_fh = NFS_FH(dir),
1287                 .name = name,
1288         };
1289         struct nfs4_lookup_res res = {
1290                 .server = server,
1291                 .fattr = fattr,
1292                 .fh = fhandle,
1293         };
1294         struct rpc_message msg = {
1295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1296                 .rpc_argp = &args,
1297                 .rpc_resp = &res,
1298         };
1299
1300         fattr->valid = 0;
1301
1302         dprintk("NFS call  lookup %s\n", name->name);
1303         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1304         dprintk("NFS reply lookup: %d\n", status);
1305         return status;
1306 }
1307
1308 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1309 {
1310         struct nfs4_exception exception = { };
1311         int err;
1312         do {
1313                 err = nfs4_handle_exception(NFS_SERVER(dir),
1314                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1315                                 &exception);
1316         } while (exception.retry);
1317         return err;
1318 }
1319
1320 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1321 {
1322         struct nfs4_accessargs args = {
1323                 .fh = NFS_FH(inode),
1324         };
1325         struct nfs4_accessres res = { 0 };
1326         struct rpc_message msg = {
1327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1328                 .rpc_argp = &args,
1329                 .rpc_resp = &res,
1330                 .rpc_cred = entry->cred,
1331         };
1332         int mode = entry->mask;
1333         int status;
1334
1335         /*
1336          * Determine which access bits we want to ask for...
1337          */
1338         if (mode & MAY_READ)
1339                 args.access |= NFS4_ACCESS_READ;
1340         if (S_ISDIR(inode->i_mode)) {
1341                 if (mode & MAY_WRITE)
1342                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1343                 if (mode & MAY_EXEC)
1344                         args.access |= NFS4_ACCESS_LOOKUP;
1345         } else {
1346                 if (mode & MAY_WRITE)
1347                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1348                 if (mode & MAY_EXEC)
1349                         args.access |= NFS4_ACCESS_EXECUTE;
1350         }
1351         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1352         if (!status) {
1353                 entry->mask = 0;
1354                 if (res.access & NFS4_ACCESS_READ)
1355                         entry->mask |= MAY_READ;
1356                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1357                         entry->mask |= MAY_WRITE;
1358                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1359                         entry->mask |= MAY_EXEC;
1360         }
1361         return status;
1362 }
1363
1364 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1365 {
1366         struct nfs4_exception exception = { };
1367         int err;
1368         do {
1369                 err = nfs4_handle_exception(NFS_SERVER(inode),
1370                                 _nfs4_proc_access(inode, entry),
1371                                 &exception);
1372         } while (exception.retry);
1373         return err;
1374 }
1375
1376 /*
1377  * TODO: For the time being, we don't try to get any attributes
1378  * along with any of the zero-copy operations READ, READDIR,
1379  * READLINK, WRITE.
1380  *
1381  * In the case of the first three, we want to put the GETATTR
1382  * after the read-type operation -- this is because it is hard
1383  * to predict the length of a GETATTR response in v4, and thus
1384  * align the READ data correctly.  This means that the GETATTR
1385  * may end up partially falling into the page cache, and we should
1386  * shift it into the 'tail' of the xdr_buf before processing.
1387  * To do this efficiently, we need to know the total length
1388  * of data received, which doesn't seem to be available outside
1389  * of the RPC layer.
1390  *
1391  * In the case of WRITE, we also want to put the GETATTR after
1392  * the operation -- in this case because we want to make sure
1393  * we get the post-operation mtime and size.  This means that
1394  * we can't use xdr_encode_pages() as written: we need a variant
1395  * of it which would leave room in the 'tail' iovec.
1396  *
1397  * Both of these changes to the XDR layer would in fact be quite
1398  * minor, but I decided to leave them for a subsequent patch.
1399  */
1400 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1401                 unsigned int pgbase, unsigned int pglen)
1402 {
1403         struct nfs4_readlink args = {
1404                 .fh       = NFS_FH(inode),
1405                 .pgbase   = pgbase,
1406                 .pglen    = pglen,
1407                 .pages    = &page,
1408         };
1409         struct rpc_message msg = {
1410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1411                 .rpc_argp = &args,
1412                 .rpc_resp = NULL,
1413         };
1414
1415         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1416 }
1417
1418 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1419                 unsigned int pgbase, unsigned int pglen)
1420 {
1421         struct nfs4_exception exception = { };
1422         int err;
1423         do {
1424                 err = nfs4_handle_exception(NFS_SERVER(inode),
1425                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1426                                 &exception);
1427         } while (exception.retry);
1428         return err;
1429 }
1430
1431 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1432 {
1433         int flags = rdata->flags;
1434         struct inode *inode = rdata->inode;
1435         struct nfs_fattr *fattr = rdata->res.fattr;
1436         struct nfs_server *server = NFS_SERVER(inode);
1437         struct rpc_message msg = {
1438                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1439                 .rpc_argp       = &rdata->args,
1440                 .rpc_resp       = &rdata->res,
1441                 .rpc_cred       = rdata->cred,
1442         };
1443         unsigned long timestamp = jiffies;
1444         int status;
1445
1446         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1447                         (long long) rdata->args.offset);
1448
1449         fattr->valid = 0;
1450         status = rpc_call_sync(server->client, &msg, flags);
1451         if (!status)
1452                 renew_lease(server, timestamp);
1453         dprintk("NFS reply read: %d\n", status);
1454         return status;
1455 }
1456
1457 static int nfs4_proc_read(struct nfs_read_data *rdata)
1458 {
1459         struct nfs4_exception exception = { };
1460         int err;
1461         do {
1462                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1463                                 _nfs4_proc_read(rdata),
1464                                 &exception);
1465         } while (exception.retry);
1466         return err;
1467 }
1468
1469 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1470 {
1471         int rpcflags = wdata->flags;
1472         struct inode *inode = wdata->inode;
1473         struct nfs_fattr *fattr = wdata->res.fattr;
1474         struct nfs_server *server = NFS_SERVER(inode);
1475         struct rpc_message msg = {
1476                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1477                 .rpc_argp       = &wdata->args,
1478                 .rpc_resp       = &wdata->res,
1479                 .rpc_cred       = wdata->cred,
1480         };
1481         int status;
1482
1483         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1484                         (long long) wdata->args.offset);
1485
1486         fattr->valid = 0;
1487         status = rpc_call_sync(server->client, &msg, rpcflags);
1488         dprintk("NFS reply write: %d\n", status);
1489         return status;
1490 }
1491
1492 static int nfs4_proc_write(struct nfs_write_data *wdata)
1493 {
1494         struct nfs4_exception exception = { };
1495         int err;
1496         do {
1497                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1498                                 _nfs4_proc_write(wdata),
1499                                 &exception);
1500         } while (exception.retry);
1501         return err;
1502 }
1503
1504 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1505 {
1506         struct inode *inode = cdata->inode;
1507         struct nfs_fattr *fattr = cdata->res.fattr;
1508         struct nfs_server *server = NFS_SERVER(inode);
1509         struct rpc_message msg = {
1510                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1511                 .rpc_argp       = &cdata->args,
1512                 .rpc_resp       = &cdata->res,
1513                 .rpc_cred       = cdata->cred,
1514         };
1515         int status;
1516
1517         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1518                         (long long) cdata->args.offset);
1519
1520         fattr->valid = 0;
1521         status = rpc_call_sync(server->client, &msg, 0);
1522         dprintk("NFS reply commit: %d\n", status);
1523         return status;
1524 }
1525
1526 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1527 {
1528         struct nfs4_exception exception = { };
1529         int err;
1530         do {
1531                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1532                                 _nfs4_proc_commit(cdata),
1533                                 &exception);
1534         } while (exception.retry);
1535         return err;
1536 }
1537
1538 /*
1539  * Got race?
1540  * We will need to arrange for the VFS layer to provide an atomic open.
1541  * Until then, this create/open method is prone to inefficiency and race
1542  * conditions due to the lookup, create, and open VFS calls from sys_open()
1543  * placed on the wire.
1544  *
1545  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1546  * The file will be opened again in the subsequent VFS open call
1547  * (nfs4_proc_file_open).
1548  *
1549  * The open for read will just hang around to be used by any process that
1550  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1551  */
1552
1553 static int
1554 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1555                  int flags, struct nameidata *nd)
1556 {
1557         struct nfs4_state *state;
1558         struct rpc_cred *cred;
1559         int status = 0;
1560
1561         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1562         if (IS_ERR(cred)) {
1563                 status = PTR_ERR(cred);
1564                 goto out;
1565         }
1566         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1567         put_rpccred(cred);
1568         if (IS_ERR(state)) {
1569                 status = PTR_ERR(state);
1570                 goto out;
1571         }
1572         d_instantiate(dentry, state->inode);
1573         if (flags & O_EXCL) {
1574                 struct nfs_fattr fattr;
1575                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1576                                      NFS_FH(state->inode), sattr, state);
1577                 if (status == 0)
1578                         nfs_setattr_update_inode(state->inode, sattr);
1579         }
1580         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1581                 nfs4_intent_set_file(nd, dentry, state);
1582         else
1583                 nfs4_close_state(state, flags);
1584 out:
1585         return status;
1586 }
1587
1588 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1589 {
1590         struct nfs4_remove_arg args = {
1591                 .fh = NFS_FH(dir),
1592                 .name = name,
1593         };
1594         struct nfs4_change_info res;
1595         struct rpc_message msg = {
1596                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1597                 .rpc_argp       = &args,
1598                 .rpc_resp       = &res,
1599         };
1600         int                     status;
1601
1602         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1603         if (status == 0)
1604                 update_changeattr(dir, &res);
1605         return status;
1606 }
1607
1608 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1609 {
1610         struct nfs4_exception exception = { };
1611         int err;
1612         do {
1613                 err = nfs4_handle_exception(NFS_SERVER(dir),
1614                                 _nfs4_proc_remove(dir, name),
1615                                 &exception);
1616         } while (exception.retry);
1617         return err;
1618 }
1619
1620 struct unlink_desc {
1621         struct nfs4_remove_arg  args;
1622         struct nfs4_change_info res;
1623 };
1624
1625 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1626                 struct qstr *name)
1627 {
1628         struct unlink_desc *up;
1629
1630         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1631         if (!up)
1632                 return -ENOMEM;
1633
1634         up->args.fh = NFS_FH(dir->d_inode);
1635         up->args.name = name;
1636
1637         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1638         msg->rpc_argp = &up->args;
1639         msg->rpc_resp = &up->res;
1640         return 0;
1641 }
1642
1643 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1644 {
1645         struct rpc_message *msg = &task->tk_msg;
1646         struct unlink_desc *up;
1647
1648         if (msg->rpc_resp != NULL) {
1649                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1650                 update_changeattr(dir->d_inode, &up->res);
1651                 kfree(up);
1652                 msg->rpc_resp = NULL;
1653                 msg->rpc_argp = NULL;
1654         }
1655         return 0;
1656 }
1657
1658 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1659                 struct inode *new_dir, struct qstr *new_name)
1660 {
1661         struct nfs4_rename_arg arg = {
1662                 .old_dir = NFS_FH(old_dir),
1663                 .new_dir = NFS_FH(new_dir),
1664                 .old_name = old_name,
1665                 .new_name = new_name,
1666         };
1667         struct nfs4_rename_res res = { };
1668         struct rpc_message msg = {
1669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1670                 .rpc_argp = &arg,
1671                 .rpc_resp = &res,
1672         };
1673         int                     status;
1674
1675         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1676
1677         if (!status) {
1678                 update_changeattr(old_dir, &res.old_cinfo);
1679                 update_changeattr(new_dir, &res.new_cinfo);
1680         }
1681         return status;
1682 }
1683
1684 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1685                 struct inode *new_dir, struct qstr *new_name)
1686 {
1687         struct nfs4_exception exception = { };
1688         int err;
1689         do {
1690                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1691                                 _nfs4_proc_rename(old_dir, old_name,
1692                                         new_dir, new_name),
1693                                 &exception);
1694         } while (exception.retry);
1695         return err;
1696 }
1697
1698 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1699 {
1700         struct nfs4_link_arg arg = {
1701                 .fh     = NFS_FH(inode),
1702                 .dir_fh = NFS_FH(dir),
1703                 .name   = name,
1704         };
1705         struct nfs4_change_info cinfo = { };
1706         struct rpc_message msg = {
1707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1708                 .rpc_argp = &arg,
1709                 .rpc_resp = &cinfo,
1710         };
1711         int                     status;
1712
1713         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1714         if (!status)
1715                 update_changeattr(dir, &cinfo);
1716
1717         return status;
1718 }
1719
1720 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1721 {
1722         struct nfs4_exception exception = { };
1723         int err;
1724         do {
1725                 err = nfs4_handle_exception(NFS_SERVER(inode),
1726                                 _nfs4_proc_link(inode, dir, name),
1727                                 &exception);
1728         } while (exception.retry);
1729         return err;
1730 }
1731
1732 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1733                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1734                 struct nfs_fattr *fattr)
1735 {
1736         struct nfs_server *server = NFS_SERVER(dir);
1737         struct nfs4_create_arg arg = {
1738                 .dir_fh = NFS_FH(dir),
1739                 .server = server,
1740                 .name = name,
1741                 .attrs = sattr,
1742                 .ftype = NF4LNK,
1743                 .bitmask = server->attr_bitmask,
1744         };
1745         struct nfs4_create_res res = {
1746                 .server = server,
1747                 .fh = fhandle,
1748                 .fattr = fattr,
1749         };
1750         struct rpc_message msg = {
1751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1752                 .rpc_argp = &arg,
1753                 .rpc_resp = &res,
1754         };
1755         int                     status;
1756
1757         if (path->len > NFS4_MAXPATHLEN)
1758                 return -ENAMETOOLONG;
1759         arg.u.symlink = path;
1760         fattr->valid = 0;
1761
1762         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1763         if (!status)
1764                 update_changeattr(dir, &res.dir_cinfo);
1765         return status;
1766 }
1767
1768 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1769                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1770                 struct nfs_fattr *fattr)
1771 {
1772         struct nfs4_exception exception = { };
1773         int err;
1774         do {
1775                 err = nfs4_handle_exception(NFS_SERVER(dir),
1776                                 _nfs4_proc_symlink(dir, name, path, sattr,
1777                                         fhandle, fattr),
1778                                 &exception);
1779         } while (exception.retry);
1780         return err;
1781 }
1782
1783 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1784                 struct iattr *sattr)
1785 {
1786         struct nfs_server *server = NFS_SERVER(dir);
1787         struct nfs_fh fhandle;
1788         struct nfs_fattr fattr;
1789         struct nfs4_create_arg arg = {
1790                 .dir_fh = NFS_FH(dir),
1791                 .server = server,
1792                 .name = &dentry->d_name,
1793                 .attrs = sattr,
1794                 .ftype = NF4DIR,
1795                 .bitmask = server->attr_bitmask,
1796         };
1797         struct nfs4_create_res res = {
1798                 .server = server,
1799                 .fh = &fhandle,
1800                 .fattr = &fattr,
1801         };
1802         struct rpc_message msg = {
1803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1804                 .rpc_argp = &arg,
1805                 .rpc_resp = &res,
1806         };
1807         int                     status;
1808
1809         fattr.valid = 0;
1810
1811         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1812         if (!status) {
1813                 update_changeattr(dir, &res.dir_cinfo);
1814                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1815         }
1816         return status;
1817 }
1818
1819 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1820                 struct iattr *sattr)
1821 {
1822         struct nfs4_exception exception = { };
1823         int err;
1824         do {
1825                 err = nfs4_handle_exception(NFS_SERVER(dir),
1826                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1827                                 &exception);
1828         } while (exception.retry);
1829         return err;
1830 }
1831
1832 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1833                   u64 cookie, struct page *page, unsigned int count, int plus)
1834 {
1835         struct inode            *dir = dentry->d_inode;
1836         struct nfs4_readdir_arg args = {
1837                 .fh = NFS_FH(dir),
1838                 .pages = &page,
1839                 .pgbase = 0,
1840                 .count = count,
1841                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1842         };
1843         struct nfs4_readdir_res res;
1844         struct rpc_message msg = {
1845                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1846                 .rpc_argp = &args,
1847                 .rpc_resp = &res,
1848                 .rpc_cred = cred,
1849         };
1850         int                     status;
1851
1852         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1853                         dentry->d_parent->d_name.name,
1854                         dentry->d_name.name,
1855                         (unsigned long long)cookie);
1856         lock_kernel();
1857         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1858         res.pgbase = args.pgbase;
1859         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1860         if (status == 0)
1861                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1862         unlock_kernel();
1863         dprintk("%s: returns %d\n", __FUNCTION__, status);
1864         return status;
1865 }
1866
1867 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1868                   u64 cookie, struct page *page, unsigned int count, int plus)
1869 {
1870         struct nfs4_exception exception = { };
1871         int err;
1872         do {
1873                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1874                                 _nfs4_proc_readdir(dentry, cred, cookie,
1875                                         page, count, plus),
1876                                 &exception);
1877         } while (exception.retry);
1878         return err;
1879 }
1880
1881 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1882                 struct iattr *sattr, dev_t rdev)
1883 {
1884         struct nfs_server *server = NFS_SERVER(dir);
1885         struct nfs_fh fh;
1886         struct nfs_fattr fattr;
1887         struct nfs4_create_arg arg = {
1888                 .dir_fh = NFS_FH(dir),
1889                 .server = server,
1890                 .name = &dentry->d_name,
1891                 .attrs = sattr,
1892                 .bitmask = server->attr_bitmask,
1893         };
1894         struct nfs4_create_res res = {
1895                 .server = server,
1896                 .fh = &fh,
1897                 .fattr = &fattr,
1898         };
1899         struct rpc_message msg = {
1900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1901                 .rpc_argp = &arg,
1902                 .rpc_resp = &res,
1903         };
1904         int                     status;
1905         int                     mode = sattr->ia_mode;
1906
1907         fattr.valid = 0;
1908
1909         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1910         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1911         if (S_ISFIFO(mode))
1912                 arg.ftype = NF4FIFO;
1913         else if (S_ISBLK(mode)) {
1914                 arg.ftype = NF4BLK;
1915                 arg.u.device.specdata1 = MAJOR(rdev);
1916                 arg.u.device.specdata2 = MINOR(rdev);
1917         }
1918         else if (S_ISCHR(mode)) {
1919                 arg.ftype = NF4CHR;
1920                 arg.u.device.specdata1 = MAJOR(rdev);
1921                 arg.u.device.specdata2 = MINOR(rdev);
1922         }
1923         else
1924                 arg.ftype = NF4SOCK;
1925
1926         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1927         if (status == 0) {
1928                 update_changeattr(dir, &res.dir_cinfo);
1929                 status = nfs_instantiate(dentry, &fh, &fattr);
1930         }
1931         return status;
1932 }
1933
1934 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1935                 struct iattr *sattr, dev_t rdev)
1936 {
1937         struct nfs4_exception exception = { };
1938         int err;
1939         do {
1940                 err = nfs4_handle_exception(NFS_SERVER(dir),
1941                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1942                                 &exception);
1943         } while (exception.retry);
1944         return err;
1945 }
1946
1947 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1948                  struct nfs_fsstat *fsstat)
1949 {
1950         struct nfs4_statfs_arg args = {
1951                 .fh = fhandle,
1952                 .bitmask = server->attr_bitmask,
1953         };
1954         struct rpc_message msg = {
1955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1956                 .rpc_argp = &args,
1957                 .rpc_resp = fsstat,
1958         };
1959
1960         fsstat->fattr->valid = 0;
1961         return rpc_call_sync(server->client, &msg, 0);
1962 }
1963
1964 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1965 {
1966         struct nfs4_exception exception = { };
1967         int err;
1968         do {
1969                 err = nfs4_handle_exception(server,
1970                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1971                                 &exception);
1972         } while (exception.retry);
1973         return err;
1974 }
1975
1976 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1977                 struct nfs_fsinfo *fsinfo)
1978 {
1979         struct nfs4_fsinfo_arg args = {
1980                 .fh = fhandle,
1981                 .bitmask = server->attr_bitmask,
1982         };
1983         struct rpc_message msg = {
1984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1985                 .rpc_argp = &args,
1986                 .rpc_resp = fsinfo,
1987         };
1988
1989         return rpc_call_sync(server->client, &msg, 0);
1990 }
1991
1992 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1993 {
1994         struct nfs4_exception exception = { };
1995         int err;
1996
1997         do {
1998                 err = nfs4_handle_exception(server,
1999                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2000                                 &exception);
2001         } while (exception.retry);
2002         return err;
2003 }
2004
2005 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2006 {
2007         fsinfo->fattr->valid = 0;
2008         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2009 }
2010
2011 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2012                 struct nfs_pathconf *pathconf)
2013 {
2014         struct nfs4_pathconf_arg args = {
2015                 .fh = fhandle,
2016                 .bitmask = server->attr_bitmask,
2017         };
2018         struct rpc_message msg = {
2019                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2020                 .rpc_argp = &args,
2021                 .rpc_resp = pathconf,
2022         };
2023
2024         /* None of the pathconf attributes are mandatory to implement */
2025         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2026                 memset(pathconf, 0, sizeof(*pathconf));
2027                 return 0;
2028         }
2029
2030         pathconf->fattr->valid = 0;
2031         return rpc_call_sync(server->client, &msg, 0);
2032 }
2033
2034 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2035                 struct nfs_pathconf *pathconf)
2036 {
2037         struct nfs4_exception exception = { };
2038         int err;
2039
2040         do {
2041                 err = nfs4_handle_exception(server,
2042                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2043                                 &exception);
2044         } while (exception.retry);
2045         return err;
2046 }
2047
2048 static void
2049 nfs4_read_done(struct rpc_task *task)
2050 {
2051         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2052         struct inode *inode = data->inode;
2053
2054         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2055                 rpc_restart_call(task);
2056                 return;
2057         }
2058         if (task->tk_status > 0)
2059                 renew_lease(NFS_SERVER(inode), data->timestamp);
2060         /* Call back common NFS readpage processing */
2061         nfs_readpage_result(task);
2062 }
2063
2064 static void
2065 nfs4_proc_read_setup(struct nfs_read_data *data)
2066 {
2067         struct rpc_task *task = &data->task;
2068         struct rpc_message msg = {
2069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2070                 .rpc_argp = &data->args,
2071                 .rpc_resp = &data->res,
2072                 .rpc_cred = data->cred,
2073         };
2074         struct inode *inode = data->inode;
2075         int flags;
2076
2077         data->timestamp   = jiffies;
2078
2079         /* N.B. Do we need to test? Never called for swapfile inode */
2080         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2081
2082         /* Finalize the task. */
2083         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2084         rpc_call_setup(task, &msg, 0);
2085 }
2086
2087 static void
2088 nfs4_write_done(struct rpc_task *task)
2089 {
2090         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2091         struct inode *inode = data->inode;
2092
2093         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2094                 rpc_restart_call(task);
2095                 return;
2096         }
2097         if (task->tk_status >= 0)
2098                 renew_lease(NFS_SERVER(inode), data->timestamp);
2099         /* Call back common NFS writeback processing */
2100         nfs_writeback_done(task);
2101 }
2102
2103 static void
2104 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2105 {
2106         struct rpc_task *task = &data->task;
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2109                 .rpc_argp = &data->args,
2110                 .rpc_resp = &data->res,
2111                 .rpc_cred = data->cred,
2112         };
2113         struct inode *inode = data->inode;
2114         int stable;
2115         int flags;
2116
2117         if (how & FLUSH_STABLE) {
2118                 if (!NFS_I(inode)->ncommit)
2119                         stable = NFS_FILE_SYNC;
2120                 else
2121                         stable = NFS_DATA_SYNC;
2122         } else
2123                 stable = NFS_UNSTABLE;
2124         data->args.stable = stable;
2125
2126         data->timestamp   = jiffies;
2127
2128         /* Set the initial flags for the task.  */
2129         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2130
2131         /* Finalize the task. */
2132         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2133         rpc_call_setup(task, &msg, 0);
2134 }
2135
2136 static void
2137 nfs4_commit_done(struct rpc_task *task)
2138 {
2139         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2140         struct inode *inode = data->inode;
2141
2142         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2143                 rpc_restart_call(task);
2144                 return;
2145         }
2146         /* Call back common NFS writeback processing */
2147         nfs_commit_done(task);
2148 }
2149
2150 static void
2151 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2152 {
2153         struct rpc_task *task = &data->task;
2154         struct rpc_message msg = {
2155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2156                 .rpc_argp = &data->args,
2157                 .rpc_resp = &data->res,
2158                 .rpc_cred = data->cred,
2159         };
2160         struct inode *inode = data->inode;
2161         int flags;
2162
2163         /* Set the initial flags for the task.  */
2164         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2165
2166         /* Finalize the task. */
2167         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2168         rpc_call_setup(task, &msg, 0);
2169 }
2170
2171 /*
2172  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2173  * standalone procedure for queueing an asynchronous RENEW.
2174  */
2175 static void
2176 renew_done(struct rpc_task *task)
2177 {
2178         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2179         unsigned long timestamp = (unsigned long)task->tk_calldata;
2180
2181         if (task->tk_status < 0) {
2182                 switch (task->tk_status) {
2183                         case -NFS4ERR_STALE_CLIENTID:
2184                         case -NFS4ERR_EXPIRED:
2185                         case -NFS4ERR_CB_PATH_DOWN:
2186                                 nfs4_schedule_state_recovery(clp);
2187                 }
2188                 return;
2189         }
2190         spin_lock(&clp->cl_lock);
2191         if (time_before(clp->cl_last_renewal,timestamp))
2192                 clp->cl_last_renewal = timestamp;
2193         spin_unlock(&clp->cl_lock);
2194 }
2195
2196 int
2197 nfs4_proc_async_renew(struct nfs4_client *clp)
2198 {
2199         struct rpc_message msg = {
2200                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2201                 .rpc_argp       = clp,
2202                 .rpc_cred       = clp->cl_cred,
2203         };
2204
2205         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2206                         renew_done, (void *)jiffies);
2207 }
2208
2209 int
2210 nfs4_proc_renew(struct nfs4_client *clp)
2211 {
2212         struct rpc_message msg = {
2213                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2214                 .rpc_argp       = clp,
2215                 .rpc_cred       = clp->cl_cred,
2216         };
2217         unsigned long now = jiffies;
2218         int status;
2219
2220         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2221         if (status < 0)
2222                 return status;
2223         spin_lock(&clp->cl_lock);
2224         if (time_before(clp->cl_last_renewal,now))
2225                 clp->cl_last_renewal = now;
2226         spin_unlock(&clp->cl_lock);
2227         return 0;
2228 }
2229
2230 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2231 {
2232         return (server->caps & NFS_CAP_ACLS)
2233                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2234                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2235 }
2236
2237 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2238  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2239  * the stack.
2240  */
2241 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2242
2243 static void buf_to_pages(const void *buf, size_t buflen,
2244                 struct page **pages, unsigned int *pgbase)
2245 {
2246         const void *p = buf;
2247
2248         *pgbase = offset_in_page(buf);
2249         p -= *pgbase;
2250         while (p < buf + buflen) {
2251                 *(pages++) = virt_to_page(p);
2252                 p += PAGE_CACHE_SIZE;
2253         }
2254 }
2255
2256 struct nfs4_cached_acl {
2257         int cached;
2258         size_t len;
2259         char data[0];
2260 };
2261
2262 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2263 {
2264         struct nfs_inode *nfsi = NFS_I(inode);
2265
2266         spin_lock(&inode->i_lock);
2267         kfree(nfsi->nfs4_acl);
2268         nfsi->nfs4_acl = acl;
2269         spin_unlock(&inode->i_lock);
2270 }
2271
2272 static void nfs4_zap_acl_attr(struct inode *inode)
2273 {
2274         nfs4_set_cached_acl(inode, NULL);
2275 }
2276
2277 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2278 {
2279         struct nfs_inode *nfsi = NFS_I(inode);
2280         struct nfs4_cached_acl *acl;
2281         int ret = -ENOENT;
2282
2283         spin_lock(&inode->i_lock);
2284         acl = nfsi->nfs4_acl;
2285         if (acl == NULL)
2286                 goto out;
2287         if (buf == NULL) /* user is just asking for length */
2288                 goto out_len;
2289         if (acl->cached == 0)
2290                 goto out;
2291         ret = -ERANGE; /* see getxattr(2) man page */
2292         if (acl->len > buflen)
2293                 goto out;
2294         memcpy(buf, acl->data, acl->len);
2295 out_len:
2296         ret = acl->len;
2297 out:
2298         spin_unlock(&inode->i_lock);
2299         return ret;
2300 }
2301
2302 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2303 {
2304         struct nfs4_cached_acl *acl;
2305
2306         if (buf && acl_len <= PAGE_SIZE) {
2307                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2308                 if (acl == NULL)
2309                         goto out;
2310                 acl->cached = 1;
2311                 memcpy(acl->data, buf, acl_len);
2312         } else {
2313                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2314                 if (acl == NULL)
2315                         goto out;
2316                 acl->cached = 0;
2317         }
2318         acl->len = acl_len;
2319 out:
2320         nfs4_set_cached_acl(inode, acl);
2321 }
2322
2323 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2324 {
2325         struct page *pages[NFS4ACL_MAXPAGES];
2326         struct nfs_getaclargs args = {
2327                 .fh = NFS_FH(inode),
2328                 .acl_pages = pages,
2329                 .acl_len = buflen,
2330         };
2331         size_t resp_len = buflen;
2332         void *resp_buf;
2333         struct rpc_message msg = {
2334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2335                 .rpc_argp = &args,
2336                 .rpc_resp = &resp_len,
2337         };
2338         struct page *localpage = NULL;
2339         int ret;
2340
2341         if (buflen < PAGE_SIZE) {
2342                 /* As long as we're doing a round trip to the server anyway,
2343                  * let's be prepared for a page of acl data. */
2344                 localpage = alloc_page(GFP_KERNEL);
2345                 resp_buf = page_address(localpage);
2346                 if (localpage == NULL)
2347                         return -ENOMEM;
2348                 args.acl_pages[0] = localpage;
2349                 args.acl_pgbase = 0;
2350                 args.acl_len = PAGE_SIZE;
2351         } else {
2352                 resp_buf = buf;
2353                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2354         }
2355         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2356         if (ret)
2357                 goto out_free;
2358         if (resp_len > args.acl_len)
2359                 nfs4_write_cached_acl(inode, NULL, resp_len);
2360         else
2361                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2362         if (buf) {
2363                 ret = -ERANGE;
2364                 if (resp_len > buflen)
2365                         goto out_free;
2366                 if (localpage)
2367                         memcpy(buf, resp_buf, resp_len);
2368         }
2369         ret = resp_len;
2370 out_free:
2371         if (localpage)
2372                 __free_page(localpage);
2373         return ret;
2374 }
2375
2376 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2377 {
2378         struct nfs_server *server = NFS_SERVER(inode);
2379         int ret;
2380
2381         if (!nfs4_server_supports_acls(server))
2382                 return -EOPNOTSUPP;
2383         ret = nfs_revalidate_inode(server, inode);
2384         if (ret < 0)
2385                 return ret;
2386         ret = nfs4_read_cached_acl(inode, buf, buflen);
2387         if (ret != -ENOENT)
2388                 return ret;
2389         return nfs4_get_acl_uncached(inode, buf, buflen);
2390 }
2391
2392 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2393 {
2394         struct nfs_server *server = NFS_SERVER(inode);
2395         struct page *pages[NFS4ACL_MAXPAGES];
2396         struct nfs_setaclargs arg = {
2397                 .fh             = NFS_FH(inode),
2398                 .acl_pages      = pages,
2399                 .acl_len        = buflen,
2400         };
2401         struct rpc_message msg = {
2402                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2403                 .rpc_argp       = &arg,
2404                 .rpc_resp       = NULL,
2405         };
2406         int ret;
2407
2408         if (!nfs4_server_supports_acls(server))
2409                 return -EOPNOTSUPP;
2410         nfs_inode_return_delegation(inode);
2411         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2412         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2413         if (ret == 0)
2414                 nfs4_write_cached_acl(inode, buf, buflen);
2415         return ret;
2416 }
2417
2418 static int
2419 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2420 {
2421         struct nfs4_client *clp = server->nfs4_state;
2422
2423         if (!clp || task->tk_status >= 0)
2424                 return 0;
2425         switch(task->tk_status) {
2426                 case -NFS4ERR_STALE_CLIENTID:
2427                 case -NFS4ERR_STALE_STATEID:
2428                 case -NFS4ERR_EXPIRED:
2429                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2430                         nfs4_schedule_state_recovery(clp);
2431                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2432                                 rpc_wake_up_task(task);
2433                         task->tk_status = 0;
2434                         return -EAGAIN;
2435                 case -NFS4ERR_GRACE:
2436                 case -NFS4ERR_DELAY:
2437                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2438                         task->tk_status = 0;
2439                         return -EAGAIN;
2440                 case -NFS4ERR_OLD_STATEID:
2441                         task->tk_status = 0;
2442                         return -EAGAIN;
2443         }
2444         task->tk_status = nfs4_map_errors(task->tk_status);
2445         return 0;
2446 }
2447
2448 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2449 {
2450         DEFINE_WAIT(wait);
2451         sigset_t oldset;
2452         int interruptible, res = 0;
2453
2454         might_sleep();
2455
2456         rpc_clnt_sigmask(clnt, &oldset);
2457         interruptible = TASK_UNINTERRUPTIBLE;
2458         if (clnt->cl_intr)
2459                 interruptible = TASK_INTERRUPTIBLE;
2460         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2461         nfs4_schedule_state_recovery(clp);
2462         if (clnt->cl_intr && signalled())
2463                 res = -ERESTARTSYS;
2464         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2465                 schedule();
2466         finish_wait(&clp->cl_waitq, &wait);
2467         rpc_clnt_sigunmask(clnt, &oldset);
2468         return res;
2469 }
2470
2471 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2472 {
2473         sigset_t oldset;
2474         int res = 0;
2475
2476         might_sleep();
2477
2478         if (*timeout <= 0)
2479                 *timeout = NFS4_POLL_RETRY_MIN;
2480         if (*timeout > NFS4_POLL_RETRY_MAX)
2481                 *timeout = NFS4_POLL_RETRY_MAX;
2482         rpc_clnt_sigmask(clnt, &oldset);
2483         if (clnt->cl_intr) {
2484                 schedule_timeout_interruptible(*timeout);
2485                 if (signalled())
2486                         res = -ERESTARTSYS;
2487         } else
2488                 schedule_timeout_uninterruptible(*timeout);
2489         rpc_clnt_sigunmask(clnt, &oldset);
2490         *timeout <<= 1;
2491         return res;
2492 }
2493
2494 /* This is the error handling routine for processes that are allowed
2495  * to sleep.
2496  */
2497 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2498 {
2499         struct nfs4_client *clp = server->nfs4_state;
2500         int ret = errorcode;
2501
2502         exception->retry = 0;
2503         switch(errorcode) {
2504                 case 0:
2505                         return 0;
2506                 case -NFS4ERR_STALE_CLIENTID:
2507                 case -NFS4ERR_STALE_STATEID:
2508                 case -NFS4ERR_EXPIRED:
2509                         ret = nfs4_wait_clnt_recover(server->client, clp);
2510                         if (ret == 0)
2511                                 exception->retry = 1;
2512                         break;
2513                 case -NFS4ERR_GRACE:
2514                 case -NFS4ERR_DELAY:
2515                         ret = nfs4_delay(server->client, &exception->timeout);
2516                         if (ret == 0)
2517                                 exception->retry = 1;
2518                         break;
2519                 case -NFS4ERR_OLD_STATEID:
2520                         if (ret == 0)
2521                                 exception->retry = 1;
2522         }
2523         /* We failed to handle the error */
2524         return nfs4_map_errors(ret);
2525 }
2526
2527 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2528 {
2529         nfs4_verifier sc_verifier;
2530         struct nfs4_setclientid setclientid = {
2531                 .sc_verifier = &sc_verifier,
2532                 .sc_prog = program,
2533         };
2534         struct rpc_message msg = {
2535                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2536                 .rpc_argp = &setclientid,
2537                 .rpc_resp = clp,
2538                 .rpc_cred = clp->cl_cred,
2539         };
2540         u32 *p;
2541         int loop = 0;
2542         int status;
2543
2544         p = (u32*)sc_verifier.data;
2545         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2546         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2547
2548         for(;;) {
2549                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2550                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2551                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2552                                 clp->cl_cred->cr_ops->cr_name,
2553                                 clp->cl_id_uniquifier);
2554                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2555                                 sizeof(setclientid.sc_netid), "tcp");
2556                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2557                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2558                                 clp->cl_ipaddr, port >> 8, port & 255);
2559
2560                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2561                 if (status != -NFS4ERR_CLID_INUSE)
2562                         break;
2563                 if (signalled())
2564                         break;
2565                 if (loop++ & 1)
2566                         ssleep(clp->cl_lease_time + 1);
2567                 else
2568                         if (++clp->cl_id_uniquifier == 0)
2569                                 break;
2570         }
2571         return status;
2572 }
2573
2574 int
2575 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2576 {
2577         struct nfs_fsinfo fsinfo;
2578         struct rpc_message msg = {
2579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2580                 .rpc_argp = clp,
2581                 .rpc_resp = &fsinfo,
2582                 .rpc_cred = clp->cl_cred,
2583         };
2584         unsigned long now;
2585         int status;
2586
2587         now = jiffies;
2588         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2589         if (status == 0) {
2590                 spin_lock(&clp->cl_lock);
2591                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2592                 clp->cl_last_renewal = now;
2593                 spin_unlock(&clp->cl_lock);
2594         }
2595         return status;
2596 }
2597
2598 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2599 {
2600         struct nfs4_delegreturnargs args = {
2601                 .fhandle = NFS_FH(inode),
2602                 .stateid = stateid,
2603         };
2604         struct rpc_message msg = {
2605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2606                 .rpc_argp = &args,
2607                 .rpc_cred = cred,
2608         };
2609
2610         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2611 }
2612
2613 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2614 {
2615         struct nfs_server *server = NFS_SERVER(inode);
2616         struct nfs4_exception exception = { };
2617         int err;
2618         do {
2619                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2620                 switch (err) {
2621                         case -NFS4ERR_STALE_STATEID:
2622                         case -NFS4ERR_EXPIRED:
2623                                 nfs4_schedule_state_recovery(server->nfs4_state);
2624                         case 0:
2625                                 return 0;
2626                 }
2627                 err = nfs4_handle_exception(server, err, &exception);
2628         } while (exception.retry);
2629         return err;
2630 }
2631
2632 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2633 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2634
2635 /*
2636  * sleep, with exponential backoff, and retry the LOCK operation.
2637  */
2638 static unsigned long
2639 nfs4_set_lock_task_retry(unsigned long timeout)
2640 {
2641         schedule_timeout_interruptible(timeout);
2642         timeout <<= 1;
2643         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2644                 return NFS4_LOCK_MAXTIMEOUT;
2645         return timeout;
2646 }
2647
2648 static inline int
2649 nfs4_lck_type(int cmd, struct file_lock *request)
2650 {
2651         /* set lock type */
2652         switch (request->fl_type) {
2653                 case F_RDLCK:
2654                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2655                 case F_WRLCK:
2656                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2657                 case F_UNLCK:
2658                         return NFS4_WRITE_LT;
2659         }
2660         BUG();
2661         return 0;
2662 }
2663
2664 static inline uint64_t
2665 nfs4_lck_length(struct file_lock *request)
2666 {
2667         if (request->fl_end == OFFSET_MAX)
2668                 return ~(uint64_t)0;
2669         return request->fl_end - request->fl_start + 1;
2670 }
2671
2672 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2673 {
2674         struct inode *inode = state->inode;
2675         struct nfs_server *server = NFS_SERVER(inode);
2676         struct nfs4_client *clp = server->nfs4_state;
2677         struct nfs_lockargs arg = {
2678                 .fh = NFS_FH(inode),
2679                 .type = nfs4_lck_type(cmd, request),
2680                 .offset = request->fl_start,
2681                 .length = nfs4_lck_length(request),
2682         };
2683         struct nfs_lockres res = {
2684                 .server = server,
2685         };
2686         struct rpc_message msg = {
2687                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2688                 .rpc_argp       = &arg,
2689                 .rpc_resp       = &res,
2690                 .rpc_cred       = state->owner->so_cred,
2691         };
2692         struct nfs_lowner nlo;
2693         struct nfs4_lock_state *lsp;
2694         int status;
2695
2696         down_read(&clp->cl_sem);
2697         nlo.clientid = clp->cl_clientid;
2698         status = nfs4_set_lock_state(state, request);
2699         if (status != 0)
2700                 goto out;
2701         lsp = request->fl_u.nfs4_fl.owner;
2702         nlo.id = lsp->ls_id;
2703         arg.u.lockt = &nlo;
2704         status = rpc_call_sync(server->client, &msg, 0);
2705         if (!status) {
2706                 request->fl_type = F_UNLCK;
2707         } else if (status == -NFS4ERR_DENIED) {
2708                 int64_t len, start, end;
2709                 start = res.u.denied.offset;
2710                 len = res.u.denied.length;
2711                 end = start + len - 1;
2712                 if (end < 0 || len == 0)
2713                         request->fl_end = OFFSET_MAX;
2714                 else
2715                         request->fl_end = (loff_t)end;
2716                 request->fl_start = (loff_t)start;
2717                 request->fl_type = F_WRLCK;
2718                 if (res.u.denied.type & 1)
2719                         request->fl_type = F_RDLCK;
2720                 request->fl_pid = 0;
2721                 status = 0;
2722         }
2723 out:
2724         up_read(&clp->cl_sem);
2725         return status;
2726 }
2727
2728 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2729 {
2730         struct nfs4_exception exception = { };
2731         int err;
2732
2733         do {
2734                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2735                                 _nfs4_proc_getlk(state, cmd, request),
2736                                 &exception);
2737         } while (exception.retry);
2738         return err;
2739 }
2740
2741 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2742 {
2743         int res = 0;
2744         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2745                 case FL_POSIX:
2746                         res = posix_lock_file_wait(file, fl);
2747                         break;
2748                 case FL_FLOCK:
2749                         res = flock_lock_file_wait(file, fl);
2750                         break;
2751                 default:
2752                         BUG();
2753         }
2754         if (res < 0)
2755                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2756                                 __FUNCTION__);
2757         return res;
2758 }
2759
2760 struct nfs4_unlockdata {
2761         struct nfs_lockargs arg;
2762         struct nfs_locku_opargs luargs;
2763         struct nfs_lockres res;
2764         struct nfs4_lock_state *lsp;
2765         struct nfs_open_context *ctx;
2766         atomic_t refcount;
2767         struct completion completion;
2768 };
2769
2770 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2771 {
2772         if (atomic_dec_and_test(&calldata->refcount)) {
2773                 nfs_free_seqid(calldata->luargs.seqid);
2774                 nfs4_put_lock_state(calldata->lsp);
2775                 put_nfs_open_context(calldata->ctx);
2776                 kfree(calldata);
2777         }
2778 }
2779
2780 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2781 {
2782         complete(&calldata->completion);
2783         nfs4_locku_release_calldata(calldata);
2784 }
2785
2786 static void nfs4_locku_done(struct rpc_task *task)
2787 {
2788         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2789
2790         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2791         switch (task->tk_status) {
2792                 case 0:
2793                         memcpy(calldata->lsp->ls_stateid.data,
2794                                         calldata->res.u.stateid.data,
2795                                         sizeof(calldata->lsp->ls_stateid.data));
2796                         break;
2797                 case -NFS4ERR_STALE_STATEID:
2798                 case -NFS4ERR_EXPIRED:
2799                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2800                         break;
2801                 default:
2802                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2803                                 rpc_restart_call(task);
2804                                 return;
2805                         }
2806         }
2807         nfs4_locku_complete(calldata);
2808 }
2809
2810 static void nfs4_locku_begin(struct rpc_task *task)
2811 {
2812         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2813         struct rpc_message msg = {
2814                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2815                 .rpc_argp       = &calldata->arg,
2816                 .rpc_resp       = &calldata->res,
2817                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2818         };
2819         int status;
2820
2821         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2822         if (status != 0)
2823                 return;
2824         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2825                 nfs4_locku_complete(calldata);
2826                 task->tk_exit = NULL;
2827                 rpc_exit(task, 0);
2828                 return;
2829         }
2830         rpc_call_setup(task, &msg, 0);
2831 }
2832
2833 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2834 {
2835         struct nfs4_unlockdata *calldata;
2836         struct inode *inode = state->inode;
2837         struct nfs_server *server = NFS_SERVER(inode);
2838         struct nfs4_lock_state *lsp;
2839         int status;
2840
2841         status = nfs4_set_lock_state(state, request);
2842         if (status != 0)
2843                 return status;
2844         lsp = request->fl_u.nfs4_fl.owner;
2845         /* We might have lost the locks! */
2846         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2847                 return 0;
2848         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2849         if (calldata == NULL)
2850                 return -ENOMEM;
2851         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2852         if (calldata->luargs.seqid == NULL) {
2853                 kfree(calldata);
2854                 return -ENOMEM;
2855         }
2856         calldata->luargs.stateid = &lsp->ls_stateid;
2857         calldata->arg.fh = NFS_FH(inode);
2858         calldata->arg.type = nfs4_lck_type(cmd, request);
2859         calldata->arg.offset = request->fl_start;
2860         calldata->arg.length = nfs4_lck_length(request);
2861         calldata->arg.u.locku = &calldata->luargs;
2862         calldata->res.server = server;
2863         calldata->lsp = lsp;
2864         atomic_inc(&lsp->ls_count);
2865
2866         /* Ensure we don't close file until we're done freeing locks! */
2867         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2868
2869         atomic_set(&calldata->refcount, 2);
2870         init_completion(&calldata->completion);
2871
2872         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2873                         nfs4_locku_done, calldata);
2874         if (status == 0)
2875                 wait_for_completion_interruptible(&calldata->completion);
2876         do_vfs_lock(request->fl_file, request);
2877         nfs4_locku_release_calldata(calldata);
2878         return status;
2879 }
2880
2881 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2882 {
2883         struct inode *inode = state->inode;
2884         struct nfs_server *server = NFS_SERVER(inode);
2885         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2886         struct nfs_lock_opargs largs = {
2887                 .lock_stateid = &lsp->ls_stateid,
2888                 .open_stateid = &state->stateid,
2889                 .lock_owner = {
2890                         .clientid = server->nfs4_state->cl_clientid,
2891                         .id = lsp->ls_id,
2892                 },
2893                 .reclaim = reclaim,
2894         };
2895         struct nfs_lockargs arg = {
2896                 .fh = NFS_FH(inode),
2897                 .type = nfs4_lck_type(cmd, request),
2898                 .offset = request->fl_start,
2899                 .length = nfs4_lck_length(request),
2900                 .u = {
2901                         .lock = &largs,
2902                 },
2903         };
2904         struct nfs_lockres res = {
2905                 .server = server,
2906         };
2907         struct rpc_message msg = {
2908                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2909                 .rpc_argp       = &arg,
2910                 .rpc_resp       = &res,
2911                 .rpc_cred       = state->owner->so_cred,
2912         };
2913         int status = -ENOMEM;
2914
2915         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2916         if (largs.lock_seqid == NULL)
2917                 return -ENOMEM;
2918         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
2919                 struct nfs4_state_owner *owner = state->owner;
2920
2921                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2922                 if (largs.open_seqid == NULL)
2923                         goto out;
2924                 largs.new_lock_owner = 1;
2925                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2926                 /* increment open seqid on success, and seqid mutating errors */
2927                 if (largs.new_lock_owner != 0) {
2928                         nfs_increment_open_seqid(status, largs.open_seqid);
2929                         if (status == 0)
2930                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
2931                 }
2932                 nfs_free_seqid(largs.open_seqid);
2933         } else
2934                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2935         /* increment lock seqid on success, and seqid mutating errors*/
2936         nfs_increment_lock_seqid(status, largs.lock_seqid);
2937         /* save the returned stateid. */
2938         if (status == 0) {
2939                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2940                                 sizeof(lsp->ls_stateid.data));
2941                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2942         } else if (status == -NFS4ERR_DENIED)
2943                 status = -EAGAIN;
2944 out:
2945         nfs_free_seqid(largs.lock_seqid);
2946         return status;
2947 }
2948
2949 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2950 {
2951         struct nfs_server *server = NFS_SERVER(state->inode);
2952         struct nfs4_exception exception = { };
2953         int err;
2954
2955         do {
2956                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2957                 if (err != -NFS4ERR_DELAY)
2958                         break;
2959                 nfs4_handle_exception(server, err, &exception);
2960         } while (exception.retry);
2961         return err;
2962 }
2963
2964 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2965 {
2966         struct nfs_server *server = NFS_SERVER(state->inode);
2967         struct nfs4_exception exception = { };
2968         int err;
2969
2970         do {
2971                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
2972                 if (err != -NFS4ERR_DELAY)
2973                         break;
2974                 nfs4_handle_exception(server, err, &exception);
2975         } while (exception.retry);
2976         return err;
2977 }
2978
2979 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2980 {
2981         struct nfs4_client *clp = state->owner->so_client;
2982         int status;
2983
2984         down_read(&clp->cl_sem);
2985         status = nfs4_set_lock_state(state, request);
2986         if (status == 0)
2987                 status = _nfs4_do_setlk(state, cmd, request, 0);
2988         if (status == 0) {
2989                 /* Note: we always want to sleep here! */
2990                 request->fl_flags |= FL_SLEEP;
2991                 if (do_vfs_lock(request->fl_file, request) < 0)
2992                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
2993         }
2994         up_read(&clp->cl_sem);
2995         return status;
2996 }
2997
2998 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2999 {
3000         struct nfs4_exception exception = { };
3001         int err;
3002
3003         do {
3004                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3005                                 _nfs4_proc_setlk(state, cmd, request),
3006                                 &exception);
3007         } while (exception.retry);
3008         return err;
3009 }
3010
3011 static int
3012 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3013 {
3014         struct nfs_open_context *ctx;
3015         struct nfs4_state *state;
3016         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3017         int status;
3018
3019         /* verify open state */
3020         ctx = (struct nfs_open_context *)filp->private_data;
3021         state = ctx->state;
3022
3023         if (request->fl_start < 0 || request->fl_end < 0)
3024                 return -EINVAL;
3025
3026         if (IS_GETLK(cmd))
3027                 return nfs4_proc_getlk(state, F_GETLK, request);
3028
3029         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3030                 return -EINVAL;
3031
3032         if (request->fl_type == F_UNLCK)
3033                 return nfs4_proc_unlck(state, cmd, request);
3034
3035         do {
3036                 status = nfs4_proc_setlk(state, cmd, request);
3037                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3038                         break;
3039                 timeout = nfs4_set_lock_task_retry(timeout);
3040                 status = -ERESTARTSYS;
3041                 if (signalled())
3042                         break;
3043         } while(status < 0);
3044         return status;
3045 }
3046
3047
3048 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3049
3050 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3051                 size_t buflen, int flags)
3052 {
3053         struct inode *inode = dentry->d_inode;
3054
3055         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3056                 return -EOPNOTSUPP;
3057
3058         if (!S_ISREG(inode->i_mode) &&
3059             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3060                 return -EPERM;
3061
3062         return nfs4_proc_set_acl(inode, buf, buflen);
3063 }
3064
3065 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3066  * and that's what we'll do for e.g. user attributes that haven't been set.
3067  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3068  * attributes in kernel-managed attribute namespaces. */
3069 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3070                 size_t buflen)
3071 {
3072         struct inode *inode = dentry->d_inode;
3073
3074         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3075                 return -EOPNOTSUPP;
3076
3077         return nfs4_proc_get_acl(inode, buf, buflen);
3078 }
3079
3080 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3081 {
3082         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3083
3084         if (buf && buflen < len)
3085                 return -ERANGE;
3086         if (buf)
3087                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3088         return len;
3089 }
3090
3091 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3092         .recover_open   = nfs4_open_reclaim,
3093         .recover_lock   = nfs4_lock_reclaim,
3094 };
3095
3096 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3097         .recover_open   = nfs4_open_expired,
3098         .recover_lock   = nfs4_lock_expired,
3099 };
3100
3101 static struct inode_operations nfs4_file_inode_operations = {
3102         .permission     = nfs_permission,
3103         .getattr        = nfs_getattr,
3104         .setattr        = nfs_setattr,
3105         .getxattr       = nfs4_getxattr,
3106         .setxattr       = nfs4_setxattr,
3107         .listxattr      = nfs4_listxattr,
3108 };
3109
3110 struct nfs_rpc_ops      nfs_v4_clientops = {
3111         .version        = 4,                    /* protocol version */
3112         .dentry_ops     = &nfs4_dentry_operations,
3113         .dir_inode_ops  = &nfs4_dir_inode_operations,
3114         .file_inode_ops = &nfs4_file_inode_operations,
3115         .getroot        = nfs4_proc_get_root,
3116         .getattr        = nfs4_proc_getattr,
3117         .setattr        = nfs4_proc_setattr,
3118         .lookup         = nfs4_proc_lookup,
3119         .access         = nfs4_proc_access,
3120         .readlink       = nfs4_proc_readlink,
3121         .read           = nfs4_proc_read,
3122         .write          = nfs4_proc_write,
3123         .commit         = nfs4_proc_commit,
3124         .create         = nfs4_proc_create,
3125         .remove         = nfs4_proc_remove,
3126         .unlink_setup   = nfs4_proc_unlink_setup,
3127         .unlink_done    = nfs4_proc_unlink_done,
3128         .rename         = nfs4_proc_rename,
3129         .link           = nfs4_proc_link,
3130         .symlink        = nfs4_proc_symlink,
3131         .mkdir          = nfs4_proc_mkdir,
3132         .rmdir          = nfs4_proc_remove,
3133         .readdir        = nfs4_proc_readdir,
3134         .mknod          = nfs4_proc_mknod,
3135         .statfs         = nfs4_proc_statfs,
3136         .fsinfo         = nfs4_proc_fsinfo,
3137         .pathconf       = nfs4_proc_pathconf,
3138         .decode_dirent  = nfs4_decode_dirent,
3139         .read_setup     = nfs4_proc_read_setup,
3140         .write_setup    = nfs4_proc_write_setup,
3141         .commit_setup   = nfs4_proc_commit_setup,
3142         .file_open      = nfs_open,
3143         .file_release   = nfs_release,
3144         .lock           = nfs4_proc_lock,
3145         .clear_acl_cache = nfs4_zap_acl_attr,
3146 };
3147
3148 /*
3149  * Local variables:
3150  *  c-basic-offset: 8
3151  * End:
3152  */