fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 struct nfs4_opendata;
  61 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data);
  62 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  63 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  64 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  67 extern struct rpc_procinfo nfs4_procedures[];
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 123                 struct nfs4_readdir_arg *readdir)
 124 {
 125         u32 *start, *p;
 126
 127         BUG_ON(readdir->count < 80);
 128         if (cookie > 2) {
 129                 readdir->cookie = cookie;
 130                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 131                 return;
 132         }
 133
 134         readdir->cookie = 0;
 135         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 136         if (cookie == 2)
 137                 return;
 138
 139         /*
 140          * NFSv4 servers do not return entries for '.' and '..'
 141          * Therefore, we fake these entries here.  We let '.'
 142          * have cookie 0 and '..' have cookie 1.  Note that
 143          * when talking to the server, we always send cookie 0
 144          * instead of 1 or 2.
 145          */
 146         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 147
 148         if (cookie == 0) {
 149                 *p++ = xdr_one;                                  /* next */
 150                 *p++ = xdr_zero;                   /* cookie, first word */
 151                 *p++ = xdr_one;                   /* cookie, second word */
 152                 *p++ = xdr_one;                             /* entry len */
 153                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 154                 p++;
 155                 *p++ = xdr_one;                         /* bitmap length */
 156                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 157                 *p++ = htonl(8);              /* attribute buffer length */
 158                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 159         }
 160
 161         *p++ = xdr_one;                                  /* next */
 162         *p++ = xdr_zero;                   /* cookie, first word */
 163         *p++ = xdr_two;                   /* cookie, second word */
 164         *p++ = xdr_two;                             /* entry len */
 165         memcpy(p, "..\0\0", 4);                         /* entry */
 166         p++;
 167         *p++ = xdr_one;                         /* bitmap length */
 168         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 169         *p++ = htonl(8);              /* attribute buffer length */
 170         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 171
 172         readdir->pgbase = (char *)p - (char *)start;
 173         readdir->count -= readdir->pgbase;
 174         kunmap_atomic(start, KM_USER0);
 175 }
 176
 177 static void
 178 renew_lease(struct nfs_server *server, unsigned long timestamp)
 179 {
 180         struct nfs4_client *clp = server->nfs4_state;
 181         spin_lock(&clp->cl_lock);
 182         if (time_before(clp->cl_last_renewal,timestamp))
 183                 clp->cl_last_renewal = timestamp;
 184         spin_unlock(&clp->cl_lock);
 185 }
 186
 187 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 188 {
 189         struct nfs_inode *nfsi = NFS_I(inode);
 190
 191         spin_lock(&inode->i_lock);
 192         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 193         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 194                 nfsi->change_attr = cinfo->after;
 195         spin_unlock(&inode->i_lock);
 196 }
 197
 198 struct nfs4_opendata {
 199         atomic_t count;
 200         struct nfs_openargs o_arg;
 201         struct nfs_openres o_res;
 202         struct nfs_open_confirmargs c_arg;
 203         struct nfs_open_confirmres c_res;
 204         struct nfs_fattr f_attr;
 205         struct nfs_fattr dir_attr;
 206         struct dentry *dentry;
 207         struct dentry *dir;
 208         struct nfs4_state_owner *owner;
 209         struct iattr attrs;
 210         int rpc_status;
 211         int cancelled;
 212 };
 213
 214 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 215                 struct nfs4_state_owner *sp, int flags,
 216                 const struct iattr *attrs)
 217 {
 218         struct dentry *parent = dget_parent(dentry);
 219         struct inode *dir = parent->d_inode;
 220         struct nfs_server *server = NFS_SERVER(dir);
 221         struct nfs4_opendata *p;
 222
 223         p = kzalloc(sizeof(*p), GFP_KERNEL);
 224         if (p == NULL)
 225                 goto err;
 226         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 227         if (p->o_arg.seqid == NULL)
 228                 goto err_free;
 229         atomic_set(&p->count, 1);
 230         p->dentry = dget(dentry);
 231         p->dir = parent;
 232         p->owner = sp;
 233         atomic_inc(&sp->so_count);
 234         p->o_arg.fh = NFS_FH(dir);
 235         p->o_arg.open_flags = flags,
 236         p->o_arg.clientid = server->nfs4_state->cl_clientid;
 237         p->o_arg.id = sp->so_id;
 238         p->o_arg.name = &dentry->d_name;
 239         p->o_arg.server = server;
 240         p->o_arg.bitmask = server->attr_bitmask;
 241         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 242         p->o_res.f_attr = &p->f_attr;
 243         p->o_res.dir_attr = &p->dir_attr;
 244         p->o_res.server = server;
 245         nfs_fattr_init(&p->f_attr);
 246         nfs_fattr_init(&p->dir_attr);
 247         if (flags & O_EXCL) {
 248                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 249                 s[0] = jiffies;
 250                 s[1] = current->pid;
 251         } else if (flags & O_CREAT) {
 252                 p->o_arg.u.attrs = &p->attrs;
 253                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 254         }
 255         p->c_arg.fh = &p->o_res.fh;
 256         p->c_arg.stateid = &p->o_res.stateid;
 257         p->c_arg.seqid = p->o_arg.seqid;
 258         return p;
 259 err_free:
 260         kfree(p);
 261 err:
 262         dput(parent);
 263         return NULL;
 264 }
 265
 266 static void nfs4_opendata_free(struct nfs4_opendata *p)
 267 {
 268         if (p != NULL && atomic_dec_and_test(&p->count)) {
 269                 nfs_free_seqid(p->o_arg.seqid);
 270                 nfs4_put_state_owner(p->owner);
 271                 dput(p->dir);
 272                 dput(p->dentry);
 273                 kfree(p);
 274         }
 275 }
 276
 277 /* Helper for asynchronous RPC calls */
 278 static int nfs4_call_async(struct rpc_clnt *clnt,
 279                 const struct rpc_call_ops *tk_ops, void *calldata)
 280 {
 281         struct rpc_task *task;
 282
 283         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 284                 return -ENOMEM;
 285         rpc_execute(task);
 286         return 0;
 287 }
 288
 289 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 290 {
 291         sigset_t oldset;
 292         int ret;
 293
 294         rpc_clnt_sigmask(task->tk_client, &oldset);
 295         ret = rpc_wait_for_completion_task(task);
 296         rpc_clnt_sigunmask(task->tk_client, &oldset);
 297         return ret;
 298 }
 299
 300 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 301 {
 302         switch (open_flags) {
 303                 case FMODE_WRITE:
 304                         state->n_wronly++;
 305                         break;
 306                 case FMODE_READ:
 307                         state->n_rdonly++;
 308                         break;
 309                 case FMODE_READ|FMODE_WRITE:
 310                         state->n_rdwr++;
 311         }
 312 }
 313
 314 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 315 {
 316         struct inode *inode = state->inode;
 317
 318         open_flags &= (FMODE_READ|FMODE_WRITE);
 319         /* Protect against nfs4_find_state_byowner() */
 320         spin_lock(&state->owner->so_lock);
 321         spin_lock(&inode->i_lock);
 322         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 323         update_open_stateflags(state, open_flags);
 324         nfs4_state_set_mode_locked(state, state->state | open_flags);
 325         spin_unlock(&inode->i_lock);
 326         spin_unlock(&state->owner->so_lock);
 327 }
 328
 329 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 330 {
 331         struct inode *inode;
 332         struct nfs4_state *state = NULL;
 333
 334         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 335                 goto out;
 336         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 337         if (inode == NULL)
 338                 goto out;
 339         state = nfs4_get_open_state(inode, data->owner);
 340         if (state == NULL)
 341                 goto put_inode;
 342         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 343 put_inode:
 344         iput(inode);
 345 out:
 346         return state;
 347 }
 348
 349 /*
 350  * OPEN_RECLAIM:
 351  *      reclaim state on the server after a reboot.
 352  */
 353 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 354 {
 355         struct inode *inode = state->inode;
 356         struct nfs_server *server = NFS_SERVER(inode);
 357         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 358         struct nfs_openargs o_arg = {
 359                 .fh = NFS_FH(inode),
 360                 .id = sp->so_id,
 361                 .open_flags = state->state,
 362                 .clientid = server->nfs4_state->cl_clientid,
 363                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 364                 .bitmask = server->attr_bitmask,
 365         };
 366         struct nfs_openres o_res = {
 367                 .server = server,       /* Grrr */
 368         };
 369         struct rpc_message msg = {
 370                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 371                 .rpc_argp       = &o_arg,
 372                 .rpc_resp       = &o_res,
 373                 .rpc_cred       = sp->so_cred,
 374         };
 375         int status;
 376
 377         if (delegation != NULL) {
 378                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 379                         memcpy(&state->stateid, &delegation->stateid,
 380                                         sizeof(state->stateid));
 381                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 382                         return 0;
 383                 }
 384                 o_arg.u.delegation_type = delegation->type;
 385         }
 386         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 387         if (o_arg.seqid == NULL)
 388                 return -ENOMEM;
 389         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 390         /* Confirm the sequence as being established */
 391         nfs_confirm_seqid(&sp->so_seqid, status);
 392         nfs_increment_open_seqid(status, o_arg.seqid);
 393         if (status == 0) {
 394                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 395                 if (o_res.delegation_type != 0) {
 396                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 397                         /* Did the server issue an immediate delegation recall? */
 398                         if (o_res.do_recall)
 399                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 400                 }
 401         }
 402         nfs_free_seqid(o_arg.seqid);
 403         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 404         /* Ensure we update the inode attributes */
 405         NFS_CACHEINV(inode);
 406         return status;
 407 }
 408
 409 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 410 {
 411         struct nfs_server *server = NFS_SERVER(state->inode);
 412         struct nfs4_exception exception = { };
 413         int err;
 414         do {
 415                 err = _nfs4_open_reclaim(sp, state);
 416                 if (err != -NFS4ERR_DELAY)
 417                         break;
 418                 nfs4_handle_exception(server, err, &exception);
 419         } while (exception.retry);
 420         return err;
 421 }
 422
 423 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 424 {
 425         struct nfs4_state_owner  *sp  = state->owner;
 426         struct inode *inode = dentry->d_inode;
 427         struct nfs_server *server = NFS_SERVER(inode);
 428         struct  rpc_message msg = {
 429                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 430                 .rpc_cred       = sp->so_cred,
 431         };
 432         struct nfs4_opendata *opendata;
 433         int status = 0;
 434
 435         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 436                 goto out;
 437         if (state->state == 0)
 438                 goto out;
 439         opendata = nfs4_opendata_alloc(dentry, sp, state->state, NULL);
 440         status = -ENOMEM;
 441         if (opendata == NULL)
 442                 goto out;
 443         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 444         msg.rpc_argp = &opendata->o_arg;
 445         msg.rpc_resp = &opendata->o_res;
 446         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 447                         sizeof(opendata->o_arg.u.delegation.data));
 448         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 449         nfs_increment_open_seqid(status, opendata->o_arg.seqid);
 450         if (status != 0)
 451                 goto out_free;
 452         if(opendata->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 453                 status = _nfs4_proc_open_confirm(opendata);
 454                 if (status != 0)
 455                         goto out_free;
 456         }
 457         nfs_confirm_seqid(&sp->so_seqid, 0);
 458         if (status >= 0) {
 459                 memcpy(state->stateid.data, opendata->o_res.stateid.data,
 460                                 sizeof(state->stateid.data));
 461                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 462         }
 463 out_free:
 464         nfs4_opendata_free(opendata);
 465 out:
 466         return status;
 467 }
 468
 469 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 470 {
 471         struct nfs4_exception exception = { };
 472         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 473         int err;
 474         do {
 475                 err = _nfs4_open_delegation_recall(dentry, state);
 476                 switch (err) {
 477                         case 0:
 478                                 return err;
 479                         case -NFS4ERR_STALE_CLIENTID:
 480                         case -NFS4ERR_STALE_STATEID:
 481                         case -NFS4ERR_EXPIRED:
 482                                 /* Don't recall a delegation if it was lost */
 483                                 nfs4_schedule_state_recovery(server->nfs4_state);
 484                                 return err;
 485                 }
 486                 err = nfs4_handle_exception(server, err, &exception);
 487         } while (exception.retry);
 488         return err;
 489 }
 490
 491 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 492 {
 493         struct nfs4_opendata *data = calldata;
 494         struct  rpc_message msg = {
 495                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 496                 .rpc_argp = &data->c_arg,
 497                 .rpc_resp = &data->c_res,
 498                 .rpc_cred = data->owner->so_cred,
 499         };
 500         rpc_call_setup(task, &msg, 0);
 501 }
 502
 503 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 504 {
 505         struct nfs4_opendata *data = calldata;
 506
 507         data->rpc_status = task->tk_status;
 508         if (RPC_ASSASSINATED(task))
 509                 return;
 510         if (data->rpc_status == 0)
 511                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 512                                 sizeof(data->o_res.stateid.data));
 513         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 514         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 515 }
 516
 517 static void nfs4_open_confirm_release(void *calldata)
 518 {
 519         struct nfs4_opendata *data = calldata;
 520         struct nfs4_state *state = NULL;
 521
 522         /* If this request hasn't been cancelled, do nothing */
 523         if (data->cancelled == 0)
 524                 goto out_free;
 525         /* In case of error, no cleanup! */
 526         if (data->rpc_status != 0)
 527                 goto out_free;
 528         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 529         state = nfs4_opendata_to_nfs4_state(data);
 530         if (state != NULL)
 531                 nfs4_close_state(state, data->o_arg.open_flags);
 532 out_free:
 533         nfs4_opendata_free(data);
 534 }
 535
 536 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 537         .rpc_call_prepare = nfs4_open_confirm_prepare,
 538         .rpc_call_done = nfs4_open_confirm_done,
 539         .rpc_release = nfs4_open_confirm_release,
 540 };
 541
 542 /*
 543  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 544  */
 545 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 546 {
 547         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 548         struct rpc_task *task;
 549         int status;
 550
 551         atomic_inc(&data->count);
 552         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 553         if (IS_ERR(task)) {
 554                 nfs4_opendata_free(data);
 555                 return PTR_ERR(task);
 556         }
 557         status = nfs4_wait_for_completion_rpc_task(task);
 558         if (status != 0) {
 559                 data->cancelled = 1;
 560                 smp_wmb();
 561         } else
 562                 status = data->rpc_status;
 563         rpc_release_task(task);
 564         return status;
 565 }
 566
 567 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 568 {
 569         struct nfs4_opendata *data = calldata;
 570         struct nfs4_state_owner *sp = data->owner;
 571         struct rpc_message msg = {
 572                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 573                 .rpc_argp = &data->o_arg,
 574                 .rpc_resp = &data->o_res,
 575                 .rpc_cred = sp->so_cred,
 576         };
 577
 578         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 579                 return;
 580         /* Update sequence id. */
 581         data->o_arg.id = sp->so_id;
 582         data->o_arg.clientid = sp->so_client->cl_clientid;
 583         rpc_call_setup(task, &msg, 0);
 584 }
 585
 586 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 587 {
 588         struct nfs4_opendata *data = calldata;
 589
 590         data->rpc_status = task->tk_status;
 591         if (RPC_ASSASSINATED(task))
 592                 return;
 593         if (task->tk_status == 0) {
 594                 switch (data->o_res.f_attr->mode & S_IFMT) {
 595                         case S_IFREG:
 596                                 break;
 597                         case S_IFLNK:
 598                                 data->rpc_status = -ELOOP;
 599                                 break;
 600                         case S_IFDIR:
 601                                 data->rpc_status = -EISDIR;
 602                                 break;
 603                         default:
 604                                 data->rpc_status = -ENOTDIR;
 605                 }
 606         }
 607         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 608 }
 609
 610 static void nfs4_open_release(void *calldata)
 611 {
 612         struct nfs4_opendata *data = calldata;
 613         struct nfs4_state *state = NULL;
 614
 615         /* If this request hasn't been cancelled, do nothing */
 616         if (data->cancelled == 0)
 617                 goto out_free;
 618         /* In case of error, no cleanup! */
 619         if (data->rpc_status != 0)
 620                 goto out_free;
 621         /* In case we need an open_confirm, no cleanup! */
 622         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 623                 goto out_free;
 624         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 625         state = nfs4_opendata_to_nfs4_state(data);
 626         if (state != NULL)
 627                 nfs4_close_state(state, data->o_arg.open_flags);
 628 out_free:
 629         nfs4_opendata_free(data);
 630 }
 631
 632 static const struct rpc_call_ops nfs4_open_ops = {
 633         .rpc_call_prepare = nfs4_open_prepare,
 634         .rpc_call_done = nfs4_open_done,
 635         .rpc_release = nfs4_open_release,
 636 };
 637
 638 /*
 639  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 640  */
 641 static int _nfs4_proc_open(struct nfs4_opendata *data)
 642 {
 643         struct inode *dir = data->dir->d_inode;
 644         struct nfs_server *server = NFS_SERVER(dir);
 645         struct nfs_openargs *o_arg = &data->o_arg;
 646         struct nfs_openres *o_res = &data->o_res;
 647         struct rpc_task *task;
 648         int status;
 649
 650         atomic_inc(&data->count);
 651         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 652         if (IS_ERR(task)) {
 653                 nfs4_opendata_free(data);
 654                 return PTR_ERR(task);
 655         }
 656         status = nfs4_wait_for_completion_rpc_task(task);
 657         if (status != 0) {
 658                 data->cancelled = 1;
 659                 smp_wmb();
 660         } else
 661                 status = data->rpc_status;
 662         rpc_release_task(task);
 663         if (status != 0)
 664                 return status;
 665
 666         if (o_arg->open_flags & O_CREAT) {
 667                 update_changeattr(dir, &o_res->cinfo);
 668                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 669         } else
 670                 nfs_refresh_inode(dir, o_res->dir_attr);
 671         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 672                 status = _nfs4_proc_open_confirm(data);
 673                 if (status != 0)
 674                         return status;
 675         }
 676         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 677         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 678                 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 679         return 0;
 680 }
 681
 682 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 683 {
 684         struct nfs_access_entry cache;
 685         int mask = 0;
 686         int status;
 687
 688         if (openflags & FMODE_READ)
 689                 mask |= MAY_READ;
 690         if (openflags & FMODE_WRITE)
 691                 mask |= MAY_WRITE;
 692         status = nfs_access_get_cached(inode, cred, &cache);
 693         if (status == 0)
 694                 goto out;
 695
 696         /* Be clever: ask server to check for all possible rights */
 697         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 698         cache.cred = cred;
 699         cache.jiffies = jiffies;
 700         status = _nfs4_proc_access(inode, &cache);
 701         if (status != 0)
 702                 return status;
 703         nfs_access_add_cache(inode, &cache);
 704 out:
 705         if ((cache.mask & mask) == mask)
 706                 return 0;
 707         return -EACCES;
 708 }
 709
 710 /*
 711  * OPEN_EXPIRED:
 712  *      reclaim state on the server after a network partition.
 713  *      Assumes caller holds the appropriate lock
 714  */
 715 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 716 {
 717         struct dentry *parent = dget_parent(dentry);
 718         struct inode *inode = state->inode;
 719         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 720         struct nfs4_opendata *opendata;
 721         struct nfs4_state *newstate;
 722         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 723         int status = 0;
 724
 725         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 726                 status = _nfs4_do_access(inode, sp->so_cred, openflags);
 727                 if (status < 0)
 728                         goto out;
 729                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 730                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 731                 goto out;
 732         }
 733         status = -ENOMEM;
 734         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 735         if (opendata == NULL)
 736                 goto out;
 737         status = _nfs4_proc_open(opendata);
 738         if (status != 0)
 739                 goto out_nodeleg;
 740         newstate = nfs4_opendata_to_nfs4_state(opendata);
 741         if (newstate != state)
 742                 goto out_stale;
 743         if (opendata->o_res.delegation_type != 0) {
 744                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 745                         nfs_inode_set_delegation(inode, sp->so_cred,
 746                                         &opendata->o_res);
 747                 else
 748                         nfs_inode_reclaim_delegation(inode, sp->so_cred,
 749                                         &opendata->o_res);
 750         }
 751 out_close_state:
 752         nfs4_close_state(newstate, openflags);
 753 out_nodeleg:
 754         nfs4_opendata_free(opendata);
 755         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 756 out:
 757         dput(parent);
 758         return status;
 759 out_stale:
 760         status = -ESTALE;
 761         /* Invalidate the state owner so we don't ever use it again */
 762         nfs4_drop_state_owner(sp);
 763         d_drop(dentry);
 764         /* Should we be trying to close that stateid? */
 765         goto out_close_state;
 766 }
 767
 768 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 769 {
 770         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 771         struct nfs4_exception exception = { };
 772         int err;
 773
 774         do {
 775                 err = _nfs4_open_expired(sp, state, dentry);
 776                 if (err == -NFS4ERR_DELAY)
 777                         nfs4_handle_exception(server, err, &exception);
 778         } while (exception.retry);
 779         return err;
 780 }
 781
 782 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 783 {
 784         struct nfs_inode *nfsi = NFS_I(state->inode);
 785         struct nfs_open_context *ctx;
 786         int status;
 787
 788         spin_lock(&state->inode->i_lock);
 789         list_for_each_entry(ctx, &nfsi->open_files, list) {
 790                 if (ctx->state != state)
 791                         continue;
 792                 get_nfs_open_context(ctx);
 793                 spin_unlock(&state->inode->i_lock);
 794                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 795                 put_nfs_open_context(ctx);
 796                 return status;
 797         }
 798         spin_unlock(&state->inode->i_lock);
 799         return -ENOENT;
 800 }
 801
 802 /*
 803  * Returns a referenced nfs4_state if there is an open delegation on the file
 804  */
 805 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 806 {
 807         struct nfs_delegation *delegation;
 808         struct nfs_server *server = NFS_SERVER(inode);
 809         struct nfs4_client *clp = server->nfs4_state;
 810         struct nfs_inode *nfsi = NFS_I(inode);
 811         struct nfs4_state_owner *sp = NULL;
 812         struct nfs4_state *state = NULL;
 813         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 814         int err;
 815
 816         /* Protect against reboot recovery - NOTE ORDER! */
 817         down_read(&clp->cl_sem);
 818         /* Protect against delegation recall */
 819         down_read(&nfsi->rwsem);
 820         delegation = NFS_I(inode)->delegation;
 821         err = -ENOENT;
 822         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 823                 goto out_err;
 824         err = -ENOMEM;
 825         if (!(sp = nfs4_get_state_owner(server, cred))) {
 826                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 827                 goto out_err;
 828         }
 829         state = nfs4_get_open_state(inode, sp);
 830         if (state == NULL)
 831                 goto out_err;
 832
 833         err = -ENOENT;
 834         if ((state->state & open_flags) == open_flags) {
 835                 spin_lock(&inode->i_lock);
 836                 update_open_stateflags(state, open_flags);
 837                 spin_unlock(&inode->i_lock);
 838                 goto out_ok;
 839         } else if (state->state != 0)
 840                 goto out_err;
 841
 842         lock_kernel();
 843         err = _nfs4_do_access(inode, cred, open_flags);
 844         unlock_kernel();
 845         if (err != 0)
 846                 goto out_err;
 847         set_bit(NFS_DELEGATED_STATE, &state->flags);
 848         update_open_stateid(state, &delegation->stateid, open_flags);
 849 out_ok:
 850         nfs4_put_state_owner(sp);
 851         up_read(&nfsi->rwsem);
 852         up_read(&clp->cl_sem);
 853         *res = state;
 854         return 0;
 855 out_err:
 856         if (sp != NULL) {
 857                 if (state != NULL)
 858                         nfs4_put_open_state(state);
 859                 nfs4_put_state_owner(sp);
 860         }
 861         up_read(&nfsi->rwsem);
 862         up_read(&clp->cl_sem);
 863         if (err != -EACCES)
 864                 nfs_inode_return_delegation(inode);
 865         return err;
 866 }
 867
 868 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 869 {
 870         struct nfs4_exception exception = { };
 871         struct nfs4_state *res;
 872         int err;
 873
 874         do {
 875                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 876                 if (err == 0)
 877                         break;
 878                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 879                                         err, &exception));
 880         } while (exception.retry);
 881         return res;
 882 }
 883
 884 /*
 885  * Returns a referenced nfs4_state
 886  */
 887 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 888 {
 889         struct nfs4_state_owner  *sp;
 890         struct nfs4_state     *state = NULL;
 891         struct nfs_server       *server = NFS_SERVER(dir);
 892         struct nfs4_client *clp = server->nfs4_state;
 893         struct nfs4_opendata *opendata;
 894         int                     status;
 895
 896         /* Protect against reboot recovery conflicts */
 897         down_read(&clp->cl_sem);
 898         status = -ENOMEM;
 899         if (!(sp = nfs4_get_state_owner(server, cred))) {
 900                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 901                 goto out_err;
 902         }
 903         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 904         if (opendata == NULL)
 905                 goto err_put_state_owner;
 906
 907         status = _nfs4_proc_open(opendata);
 908         if (status != 0)
 909                 goto err_opendata_free;
 910
 911         status = -ENOMEM;
 912         state = nfs4_opendata_to_nfs4_state(opendata);
 913         if (state == NULL)
 914                 goto err_opendata_free;
 915         if (opendata->o_res.delegation_type != 0)
 916                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 917         nfs4_opendata_free(opendata);
 918         nfs4_put_state_owner(sp);
 919         up_read(&clp->cl_sem);
 920         *res = state;
 921         return 0;
 922 err_opendata_free:
 923         nfs4_opendata_free(opendata);
 924 err_put_state_owner:
 925         nfs4_put_state_owner(sp);
 926 out_err:
 927         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 928         up_read(&clp->cl_sem);
 929         *res = NULL;
 930         return status;
 931 }
 932
 933
 934 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 935 {
 936         struct nfs4_exception exception = { };
 937         struct nfs4_state *res;
 938         int status;
 939
 940         do {
 941                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 942                 if (status == 0)
 943                         break;
 944                 /* NOTE: BAD_SEQID means the server and client disagree about the
 945                  * book-keeping w.r.t. state-changing operations
 946                  * (OPEN/CLOSE/LOCK/LOCKU...)
 947                  * It is actually a sign of a bug on the client or on the server.
 948                  *
 949                  * If we receive a BAD_SEQID error in the particular case of
 950                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 951                  * have unhashed the old state_owner for us, and that we can
 952                  * therefore safely retry using a new one. We should still warn
 953                  * the user though...
 954                  */
 955                 if (status == -NFS4ERR_BAD_SEQID) {
 956                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 957                         exception.retry = 1;
 958                         continue;
 959                 }
 960                 /*
 961                  * BAD_STATEID on OPEN means that the server cancelled our
 962                  * state before it received the OPEN_CONFIRM.
 963                  * Recover by retrying the request as per the discussion
 964                  * on Page 181 of RFC3530.
 965                  */
 966                 if (status == -NFS4ERR_BAD_STATEID) {
 967                         exception.retry = 1;
 968                         continue;
 969                 }
 970                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 971                                         status, &exception));
 972         } while (exception.retry);
 973         return res;
 974 }
 975
 976 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 977                 struct nfs_fh *fhandle, struct iattr *sattr,
 978                 struct nfs4_state *state)
 979 {
 980         struct nfs_setattrargs  arg = {
 981                 .fh             = fhandle,
 982                 .iap            = sattr,
 983                 .server         = server,
 984                 .bitmask = server->attr_bitmask,
 985         };
 986         struct nfs_setattrres  res = {
 987                 .fattr          = fattr,
 988                 .server         = server,
 989         };
 990         struct rpc_message msg = {
 991                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 992                 .rpc_argp       = &arg,
 993                 .rpc_resp       = &res,
 994         };
 995         int status;
 996
 997         nfs_fattr_init(fattr);
 998
 999         if (state != NULL) {
1000                 msg.rpc_cred = state->owner->so_cred;
1001                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1002         } else
1003                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1004
1005         status = rpc_call_sync(server->client, &msg, 0);
1006         return status;
1007 }
1008
1009 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
1010                 struct nfs_fh *fhandle, struct iattr *sattr,
1011                 struct nfs4_state *state)
1012 {
1013         struct nfs4_exception exception = { };
1014         int err;
1015         do {
1016                 err = nfs4_handle_exception(server,
1017                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
1018                                         state),
1019                                 &exception);
1020         } while (exception.retry);
1021         return err;
1022 }
1023
1024 struct nfs4_closedata {
1025         struct inode *inode;
1026         struct nfs4_state *state;
1027         struct nfs_closeargs arg;
1028         struct nfs_closeres res;
1029         struct nfs_fattr fattr;
1030 };
1031
1032 static void nfs4_free_closedata(void *data)
1033 {
1034         struct nfs4_closedata *calldata = data;
1035         struct nfs4_state_owner *sp = calldata->state->owner;
1036
1037         nfs4_put_open_state(calldata->state);
1038         nfs_free_seqid(calldata->arg.seqid);
1039         nfs4_put_state_owner(sp);
1040         kfree(calldata);
1041 }
1042
1043 static void nfs4_close_done(struct rpc_task *task, void *data)
1044 {
1045         struct nfs4_closedata *calldata = data;
1046         struct nfs4_state *state = calldata->state;
1047         struct nfs_server *server = NFS_SERVER(calldata->inode);
1048
1049         if (RPC_ASSASSINATED(task))
1050                 return;
1051         /* hmm. we are done with the inode, and in the process of freeing
1052          * the state_owner. we keep this around to process errors
1053          */
1054         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1055         switch (task->tk_status) {
1056                 case 0:
1057                         memcpy(&state->stateid, &calldata->res.stateid,
1058                                         sizeof(state->stateid));
1059                         break;
1060                 case -NFS4ERR_STALE_STATEID:
1061                 case -NFS4ERR_EXPIRED:
1062                         nfs4_schedule_state_recovery(server->nfs4_state);
1063                         break;
1064                 default:
1065                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1066                                 rpc_restart_call(task);
1067                                 return;
1068                         }
1069         }
1070         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1071 }
1072
1073 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1074 {
1075         struct nfs4_closedata *calldata = data;
1076         struct nfs4_state *state = calldata->state;
1077         struct rpc_message msg = {
1078                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1079                 .rpc_argp = &calldata->arg,
1080                 .rpc_resp = &calldata->res,
1081                 .rpc_cred = state->owner->so_cred,
1082         };
1083         int mode = 0, old_mode;
1084
1085         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1086                 return;
1087         /* Recalculate the new open mode in case someone reopened the file
1088          * while we were waiting in line to be scheduled.
1089          */
1090         spin_lock(&state->owner->so_lock);
1091         spin_lock(&calldata->inode->i_lock);
1092         mode = old_mode = state->state;
1093         if (state->n_rdwr == 0) {
1094                 if (state->n_rdonly == 0)
1095                         mode &= ~FMODE_READ;
1096                 if (state->n_wronly == 0)
1097                         mode &= ~FMODE_WRITE;
1098         }
1099         nfs4_state_set_mode_locked(state, mode);
1100         spin_unlock(&calldata->inode->i_lock);
1101         spin_unlock(&state->owner->so_lock);
1102         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1103                 /* Note: exit _without_ calling nfs4_close_done */
1104                 task->tk_action = NULL;
1105                 return;
1106         }
1107         nfs_fattr_init(calldata->res.fattr);
1108         if (mode != 0)
1109                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1110         calldata->arg.open_flags = mode;
1111         rpc_call_setup(task, &msg, 0);
1112 }
1113
1114 static const struct rpc_call_ops nfs4_close_ops = {
1115         .rpc_call_prepare = nfs4_close_prepare,
1116         .rpc_call_done = nfs4_close_done,
1117         .rpc_release = nfs4_free_closedata,
1118 };
1119
1120 /*
1121  * It is possible for data to be read/written from a mem-mapped file
1122  * after the sys_close call (which hits the vfs layer as a flush).
1123  * This means that we can't safely call nfsv4 close on a file until
1124  * the inode is cleared. This in turn means that we are not good
1125  * NFSv4 citizens - we do not indicate to the server to update the file's
1126  * share state even when we are done with one of the three share
1127  * stateid's in the inode.
1128  *
1129  * NOTE: Caller must be holding the sp->so_owner semaphore!
1130  */
1131 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1132 {
1133         struct nfs_server *server = NFS_SERVER(inode);
1134         struct nfs4_closedata *calldata;
1135         int status = -ENOMEM;
1136
1137         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1138         if (calldata == NULL)
1139                 goto out;
1140         calldata->inode = inode;
1141         calldata->state = state;
1142         calldata->arg.fh = NFS_FH(inode);
1143         calldata->arg.stateid = &state->stateid;
1144         /* Serialization for the sequence id */
1145         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1146         if (calldata->arg.seqid == NULL)
1147                 goto out_free_calldata;
1148         calldata->arg.bitmask = server->attr_bitmask;
1149         calldata->res.fattr = &calldata->fattr;
1150         calldata->res.server = server;
1151
1152         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1153         if (status == 0)
1154                 goto out;
1155
1156         nfs_free_seqid(calldata->arg.seqid);
1157 out_free_calldata:
1158         kfree(calldata);
1159 out:
1160         return status;
1161 }
1162
1163 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1164 {
1165         struct file *filp;
1166
1167         filp = lookup_instantiate_filp(nd, dentry, NULL);
1168         if (!IS_ERR(filp)) {
1169                 struct nfs_open_context *ctx;
1170                 ctx = (struct nfs_open_context *)filp->private_data;
1171                 ctx->state = state;
1172         } else
1173                 nfs4_close_state(state, nd->intent.open.flags);
1174 }
1175
1176 struct dentry *
1177 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1178 {
1179         struct iattr attr;
1180         struct rpc_cred *cred;
1181         struct nfs4_state *state;
1182         struct dentry *res;
1183
1184         if (nd->flags & LOOKUP_CREATE) {
1185                 attr.ia_mode = nd->intent.open.create_mode;
1186                 attr.ia_valid = ATTR_MODE;
1187                 if (!IS_POSIXACL(dir))
1188                         attr.ia_mode &= ~current->fs->umask;
1189         } else {
1190                 attr.ia_valid = 0;
1191                 BUG_ON(nd->intent.open.flags & O_CREAT);
1192         }
1193
1194         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1195         if (IS_ERR(cred))
1196                 return (struct dentry *)cred;
1197         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1198         put_rpccred(cred);
1199         if (IS_ERR(state)) {
1200                 if (PTR_ERR(state) == -ENOENT)
1201                         d_add(dentry, NULL);
1202                 return (struct dentry *)state;
1203         }
1204         res = d_add_unique(dentry, igrab(state->inode));
1205         if (res != NULL)
1206                 dentry = res;
1207         nfs4_intent_set_file(nd, dentry, state);
1208         return res;
1209 }
1210
1211 int
1212 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1213 {
1214         struct rpc_cred *cred;
1215         struct nfs4_state *state;
1216
1217         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1218         if (IS_ERR(cred))
1219                 return PTR_ERR(cred);
1220         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1221         if (IS_ERR(state))
1222                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1223         put_rpccred(cred);
1224         if (IS_ERR(state)) {
1225                 switch (PTR_ERR(state)) {
1226                         case -EPERM:
1227                         case -EACCES:
1228                         case -EDQUOT:
1229                         case -ENOSPC:
1230                         case -EROFS:
1231                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1232                                 return 1;
1233                         case -ENOENT:
1234                                 if (dentry->d_inode == NULL)
1235                                         return 1;
1236                 }
1237                 goto out_drop;
1238         }
1239         if (state->inode == dentry->d_inode) {
1240                 nfs4_intent_set_file(nd, dentry, state);
1241                 return 1;
1242         }
1243         nfs4_close_state(state, openflags);
1244 out_drop:
1245         d_drop(dentry);
1246         return 0;
1247 }
1248
1249
1250 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1251 {
1252         struct nfs4_server_caps_res res = {};
1253         struct rpc_message msg = {
1254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1255                 .rpc_argp = fhandle,
1256                 .rpc_resp = &res,
1257         };
1258         int status;
1259
1260         status = rpc_call_sync(server->client, &msg, 0);
1261         if (status == 0) {
1262                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1263                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1264                         server->caps |= NFS_CAP_ACLS;
1265                 if (res.has_links != 0)
1266                         server->caps |= NFS_CAP_HARDLINKS;
1267                 if (res.has_symlinks != 0)
1268                         server->caps |= NFS_CAP_SYMLINKS;
1269                 server->acl_bitmask = res.acl_bitmask;
1270         }
1271         return status;
1272 }
1273
1274 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1275 {
1276         struct nfs4_exception exception = { };
1277         int err;
1278         do {
1279                 err = nfs4_handle_exception(server,
1280                                 _nfs4_server_capabilities(server, fhandle),
1281                                 &exception);
1282         } while (exception.retry);
1283         return err;
1284 }
1285
1286 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1287                 struct nfs_fsinfo *info)
1288 {
1289         struct nfs4_lookup_root_arg args = {
1290                 .bitmask = nfs4_fattr_bitmap,
1291         };
1292         struct nfs4_lookup_res res = {
1293                 .server = server,
1294                 .fattr = info->fattr,
1295                 .fh = fhandle,
1296         };
1297         struct rpc_message msg = {
1298                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1299                 .rpc_argp = &args,
1300                 .rpc_resp = &res,
1301         };
1302         nfs_fattr_init(info->fattr);
1303         return rpc_call_sync(server->client, &msg, 0);
1304 }
1305
1306 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1307                 struct nfs_fsinfo *info)
1308 {
1309         struct nfs4_exception exception = { };
1310         int err;
1311         do {
1312                 err = nfs4_handle_exception(server,
1313                                 _nfs4_lookup_root(server, fhandle, info),
1314                                 &exception);
1315         } while (exception.retry);
1316         return err;
1317 }
1318
1319 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1320                 struct nfs_fsinfo *info)
1321 {
1322         struct nfs_fattr *      fattr = info->fattr;
1323         unsigned char *         p;
1324         struct qstr             q;
1325         struct nfs4_lookup_arg args = {
1326                 .dir_fh = fhandle,
1327                 .name = &q,
1328                 .bitmask = nfs4_fattr_bitmap,
1329         };
1330         struct nfs4_lookup_res res = {
1331                 .server = server,
1332                 .fattr = fattr,
1333                 .fh = fhandle,
1334         };
1335         struct rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1337                 .rpc_argp = &args,
1338                 .rpc_resp = &res,
1339         };
1340         int status;
1341
1342         /*
1343          * Now we do a separate LOOKUP for each component of the mount path.
1344          * The LOOKUPs are done separately so that we can conveniently
1345          * catch an ERR_WRONGSEC if it occurs along the way...
1346          */
1347         status = nfs4_lookup_root(server, fhandle, info);
1348         if (status)
1349                 goto out;
1350
1351         p = server->mnt_path;
1352         for (;;) {
1353                 struct nfs4_exception exception = { };
1354
1355                 while (*p == '/')
1356                         p++;
1357                 if (!*p)
1358                         break;
1359                 q.name = p;
1360                 while (*p && (*p != '/'))
1361                         p++;
1362                 q.len = p - q.name;
1363
1364                 do {
1365                         nfs_fattr_init(fattr);
1366                         status = nfs4_handle_exception(server,
1367                                         rpc_call_sync(server->client, &msg, 0),
1368                                         &exception);
1369                 } while (exception.retry);
1370                 if (status == 0)
1371                         continue;
1372                 if (status == -ENOENT) {
1373                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1374                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1375                 }
1376                 break;
1377         }
1378         if (status == 0)
1379                 status = nfs4_server_capabilities(server, fhandle);
1380         if (status == 0)
1381                 status = nfs4_do_fsinfo(server, fhandle, info);
1382 out:
1383         return status;
1384 }
1385
1386 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1387 {
1388         struct nfs4_getattr_arg args = {
1389                 .fh = fhandle,
1390                 .bitmask = server->attr_bitmask,
1391         };
1392         struct nfs4_getattr_res res = {
1393                 .fattr = fattr,
1394                 .server = server,
1395         };
1396         struct rpc_message msg = {
1397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1398                 .rpc_argp = &args,
1399                 .rpc_resp = &res,
1400         };
1401
1402         nfs_fattr_init(fattr);
1403         return rpc_call_sync(server->client, &msg, 0);
1404 }
1405
1406 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1407 {
1408         struct nfs4_exception exception = { };
1409         int err;
1410         do {
1411                 err = nfs4_handle_exception(server,
1412                                 _nfs4_proc_getattr(server, fhandle, fattr),
1413                                 &exception);
1414         } while (exception.retry);
1415         return err;
1416 }
1417
1418 /*
1419  * The file is not closed if it is opened due to the a request to change
1420  * the size of the file. The open call will not be needed once the
1421  * VFS layer lookup-intents are implemented.
1422  *
1423  * Close is called when the inode is destroyed.
1424  * If we haven't opened the file for O_WRONLY, we
1425  * need to in the size_change case to obtain a stateid.
1426  *
1427  * Got race?
1428  * Because OPEN is always done by name in nfsv4, it is
1429  * possible that we opened a different file by the same
1430  * name.  We can recognize this race condition, but we
1431  * can't do anything about it besides returning an error.
1432  *
1433  * This will be fixed with VFS changes (lookup-intent).
1434  */
1435 static int
1436 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1437                   struct iattr *sattr)
1438 {
1439         struct rpc_cred *cred;
1440         struct inode *inode = dentry->d_inode;
1441         struct nfs_open_context *ctx;
1442         struct nfs4_state *state = NULL;
1443         int status;
1444
1445         nfs_fattr_init(fattr);
1446
1447         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1448         if (IS_ERR(cred))
1449                 return PTR_ERR(cred);
1450
1451         /* Search for an existing open(O_WRITE) file */
1452         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1453         if (ctx != NULL)
1454                 state = ctx->state;
1455
1456         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1457                         NFS_FH(inode), sattr, state);
1458         if (status == 0)
1459                 nfs_setattr_update_inode(inode, sattr);
1460         if (ctx != NULL)
1461                 put_nfs_open_context(ctx);
1462         put_rpccred(cred);
1463         return status;
1464 }
1465
1466 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1467                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1468 {
1469         int                    status;
1470         struct nfs_server *server = NFS_SERVER(dir);
1471         struct nfs4_lookup_arg args = {
1472                 .bitmask = server->attr_bitmask,
1473                 .dir_fh = NFS_FH(dir),
1474                 .name = name,
1475         };
1476         struct nfs4_lookup_res res = {
1477                 .server = server,
1478                 .fattr = fattr,
1479                 .fh = fhandle,
1480         };
1481         struct rpc_message msg = {
1482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1483                 .rpc_argp = &args,
1484                 .rpc_resp = &res,
1485         };
1486
1487         nfs_fattr_init(fattr);
1488
1489         dprintk("NFS call  lookup %s\n", name->name);
1490         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1491         dprintk("NFS reply lookup: %d\n", status);
1492         return status;
1493 }
1494
1495 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1496 {
1497         struct nfs4_exception exception = { };
1498         int err;
1499         do {
1500                 err = nfs4_handle_exception(NFS_SERVER(dir),
1501                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1502                                 &exception);
1503         } while (exception.retry);
1504         return err;
1505 }
1506
1507 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1508 {
1509         struct nfs4_accessargs args = {
1510                 .fh = NFS_FH(inode),
1511         };
1512         struct nfs4_accessres res = { 0 };
1513         struct rpc_message msg = {
1514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1515                 .rpc_argp = &args,
1516                 .rpc_resp = &res,
1517                 .rpc_cred = entry->cred,
1518         };
1519         int mode = entry->mask;
1520         int status;
1521
1522         /*
1523          * Determine which access bits we want to ask for...
1524          */
1525         if (mode & MAY_READ)
1526                 args.access |= NFS4_ACCESS_READ;
1527         if (S_ISDIR(inode->i_mode)) {
1528                 if (mode & MAY_WRITE)
1529                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1530                 if (mode & MAY_EXEC)
1531                         args.access |= NFS4_ACCESS_LOOKUP;
1532         } else {
1533                 if (mode & MAY_WRITE)
1534                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1535                 if (mode & MAY_EXEC)
1536                         args.access |= NFS4_ACCESS_EXECUTE;
1537         }
1538         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1539         if (!status) {
1540                 entry->mask = 0;
1541                 if (res.access & NFS4_ACCESS_READ)
1542                         entry->mask |= MAY_READ;
1543                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1544                         entry->mask |= MAY_WRITE;
1545                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1546                         entry->mask |= MAY_EXEC;
1547         }
1548         return status;
1549 }
1550
1551 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1552 {
1553         struct nfs4_exception exception = { };
1554         int err;
1555         do {
1556                 err = nfs4_handle_exception(NFS_SERVER(inode),
1557                                 _nfs4_proc_access(inode, entry),
1558                                 &exception);
1559         } while (exception.retry);
1560         return err;
1561 }
1562
1563 /*
1564  * TODO: For the time being, we don't try to get any attributes
1565  * along with any of the zero-copy operations READ, READDIR,
1566  * READLINK, WRITE.
1567  *
1568  * In the case of the first three, we want to put the GETATTR
1569  * after the read-type operation -- this is because it is hard
1570  * to predict the length of a GETATTR response in v4, and thus
1571  * align the READ data correctly.  This means that the GETATTR
1572  * may end up partially falling into the page cache, and we should
1573  * shift it into the 'tail' of the xdr_buf before processing.
1574  * To do this efficiently, we need to know the total length
1575  * of data received, which doesn't seem to be available outside
1576  * of the RPC layer.
1577  *
1578  * In the case of WRITE, we also want to put the GETATTR after
1579  * the operation -- in this case because we want to make sure
1580  * we get the post-operation mtime and size.  This means that
1581  * we can't use xdr_encode_pages() as written: we need a variant
1582  * of it which would leave room in the 'tail' iovec.
1583  *
1584  * Both of these changes to the XDR layer would in fact be quite
1585  * minor, but I decided to leave them for a subsequent patch.
1586  */
1587 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1588                 unsigned int pgbase, unsigned int pglen)
1589 {
1590         struct nfs4_readlink args = {
1591                 .fh       = NFS_FH(inode),
1592                 .pgbase   = pgbase,
1593                 .pglen    = pglen,
1594                 .pages    = &page,
1595         };
1596         struct rpc_message msg = {
1597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1598                 .rpc_argp = &args,
1599                 .rpc_resp = NULL,
1600         };
1601
1602         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1603 }
1604
1605 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1606                 unsigned int pgbase, unsigned int pglen)
1607 {
1608         struct nfs4_exception exception = { };
1609         int err;
1610         do {
1611                 err = nfs4_handle_exception(NFS_SERVER(inode),
1612                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1613                                 &exception);
1614         } while (exception.retry);
1615         return err;
1616 }
1617
1618 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1619 {
1620         int flags = rdata->flags;
1621         struct inode *inode = rdata->inode;
1622         struct nfs_fattr *fattr = rdata->res.fattr;
1623         struct nfs_server *server = NFS_SERVER(inode);
1624         struct rpc_message msg = {
1625                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1626                 .rpc_argp       = &rdata->args,
1627                 .rpc_resp       = &rdata->res,
1628                 .rpc_cred       = rdata->cred,
1629         };
1630         unsigned long timestamp = jiffies;
1631         int status;
1632
1633         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1634                         (long long) rdata->args.offset);
1635
1636         nfs_fattr_init(fattr);
1637         status = rpc_call_sync(server->client, &msg, flags);
1638         if (!status)
1639                 renew_lease(server, timestamp);
1640         dprintk("NFS reply read: %d\n", status);
1641         return status;
1642 }
1643
1644 static int nfs4_proc_read(struct nfs_read_data *rdata)
1645 {
1646         struct nfs4_exception exception = { };
1647         int err;
1648         do {
1649                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1650                                 _nfs4_proc_read(rdata),
1651                                 &exception);
1652         } while (exception.retry);
1653         return err;
1654 }
1655
1656 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1657 {
1658         int rpcflags = wdata->flags;
1659         struct inode *inode = wdata->inode;
1660         struct nfs_fattr *fattr = wdata->res.fattr;
1661         struct nfs_server *server = NFS_SERVER(inode);
1662         struct rpc_message msg = {
1663                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1664                 .rpc_argp       = &wdata->args,
1665                 .rpc_resp       = &wdata->res,
1666                 .rpc_cred       = wdata->cred,
1667         };
1668         int status;
1669
1670         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1671                         (long long) wdata->args.offset);
1672
1673         wdata->args.bitmask = server->attr_bitmask;
1674         wdata->res.server = server;
1675         nfs_fattr_init(fattr);
1676         status = rpc_call_sync(server->client, &msg, rpcflags);
1677         dprintk("NFS reply write: %d\n", status);
1678         if (status < 0)
1679                 return status;
1680         nfs_post_op_update_inode(inode, fattr);
1681         return wdata->res.count;
1682 }
1683
1684 static int nfs4_proc_write(struct nfs_write_data *wdata)
1685 {
1686         struct nfs4_exception exception = { };
1687         int err;
1688         do {
1689                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1690                                 _nfs4_proc_write(wdata),
1691                                 &exception);
1692         } while (exception.retry);
1693         return err;
1694 }
1695
1696 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1697 {
1698         struct inode *inode = cdata->inode;
1699         struct nfs_fattr *fattr = cdata->res.fattr;
1700         struct nfs_server *server = NFS_SERVER(inode);
1701         struct rpc_message msg = {
1702                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1703                 .rpc_argp       = &cdata->args,
1704                 .rpc_resp       = &cdata->res,
1705                 .rpc_cred       = cdata->cred,
1706         };
1707         int status;
1708
1709         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1710                         (long long) cdata->args.offset);
1711
1712         cdata->args.bitmask = server->attr_bitmask;
1713         cdata->res.server = server;
1714         nfs_fattr_init(fattr);
1715         status = rpc_call_sync(server->client, &msg, 0);
1716         dprintk("NFS reply commit: %d\n", status);
1717         if (status >= 0)
1718                 nfs_post_op_update_inode(inode, fattr);
1719         return status;
1720 }
1721
1722 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1723 {
1724         struct nfs4_exception exception = { };
1725         int err;
1726         do {
1727                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1728                                 _nfs4_proc_commit(cdata),
1729                                 &exception);
1730         } while (exception.retry);
1731         return err;
1732 }
1733
1734 /*
1735  * Got race?
1736  * We will need to arrange for the VFS layer to provide an atomic open.
1737  * Until then, this create/open method is prone to inefficiency and race
1738  * conditions due to the lookup, create, and open VFS calls from sys_open()
1739  * placed on the wire.
1740  *
1741  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1742  * The file will be opened again in the subsequent VFS open call
1743  * (nfs4_proc_file_open).
1744  *
1745  * The open for read will just hang around to be used by any process that
1746  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1747  */
1748
1749 static int
1750 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1751                  int flags, struct nameidata *nd)
1752 {
1753         struct nfs4_state *state;
1754         struct rpc_cred *cred;
1755         int status = 0;
1756
1757         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1758         if (IS_ERR(cred)) {
1759                 status = PTR_ERR(cred);
1760                 goto out;
1761         }
1762         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1763         put_rpccred(cred);
1764         if (IS_ERR(state)) {
1765                 status = PTR_ERR(state);
1766                 goto out;
1767         }
1768         d_instantiate(dentry, igrab(state->inode));
1769         if (flags & O_EXCL) {
1770                 struct nfs_fattr fattr;
1771                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1772                                      NFS_FH(state->inode), sattr, state);
1773                 if (status == 0)
1774                         nfs_setattr_update_inode(state->inode, sattr);
1775         }
1776         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1777                 nfs4_intent_set_file(nd, dentry, state);
1778         else
1779                 nfs4_close_state(state, flags);
1780 out:
1781         return status;
1782 }
1783
1784 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1785 {
1786         struct nfs_server *server = NFS_SERVER(dir);
1787         struct nfs4_remove_arg args = {
1788                 .fh = NFS_FH(dir),
1789                 .name = name,
1790                 .bitmask = server->attr_bitmask,
1791         };
1792         struct nfs_fattr dir_attr;
1793         struct nfs4_remove_res  res = {
1794                 .server = server,
1795                 .dir_attr = &dir_attr,
1796         };
1797         struct rpc_message msg = {
1798                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1799                 .rpc_argp       = &args,
1800                 .rpc_resp       = &res,
1801         };
1802         int                     status;
1803
1804         nfs_fattr_init(res.dir_attr);
1805         status = rpc_call_sync(server->client, &msg, 0);
1806         if (status == 0) {
1807                 update_changeattr(dir, &res.cinfo);
1808                 nfs_post_op_update_inode(dir, res.dir_attr);
1809         }
1810         return status;
1811 }
1812
1813 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1814 {
1815         struct nfs4_exception exception = { };
1816         int err;
1817         do {
1818                 err = nfs4_handle_exception(NFS_SERVER(dir),
1819                                 _nfs4_proc_remove(dir, name),
1820                                 &exception);
1821         } while (exception.retry);
1822         return err;
1823 }
1824
1825 struct unlink_desc {
1826         struct nfs4_remove_arg  args;
1827         struct nfs4_remove_res  res;
1828         struct nfs_fattr dir_attr;
1829 };
1830
1831 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1832                 struct qstr *name)
1833 {
1834         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1835         struct unlink_desc *up;
1836
1837         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1838         if (!up)
1839                 return -ENOMEM;
1840
1841         up->args.fh = NFS_FH(dir->d_inode);
1842         up->args.name = name;
1843         up->args.bitmask = server->attr_bitmask;
1844         up->res.server = server;
1845         up->res.dir_attr = &up->dir_attr;
1846
1847         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1848         msg->rpc_argp = &up->args;
1849         msg->rpc_resp = &up->res;
1850         return 0;
1851 }
1852
1853 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1854 {
1855         struct rpc_message *msg = &task->tk_msg;
1856         struct unlink_desc *up;
1857
1858         if (msg->rpc_resp != NULL) {
1859                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1860                 update_changeattr(dir->d_inode, &up->res.cinfo);
1861                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1862                 kfree(up);
1863                 msg->rpc_resp = NULL;
1864                 msg->rpc_argp = NULL;
1865         }
1866         return 0;
1867 }
1868
1869 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1870                 struct inode *new_dir, struct qstr *new_name)
1871 {
1872         struct nfs_server *server = NFS_SERVER(old_dir);
1873         struct nfs4_rename_arg arg = {
1874                 .old_dir = NFS_FH(old_dir),
1875                 .new_dir = NFS_FH(new_dir),
1876                 .old_name = old_name,
1877                 .new_name = new_name,
1878                 .bitmask = server->attr_bitmask,
1879         };
1880         struct nfs_fattr old_fattr, new_fattr;
1881         struct nfs4_rename_res res = {
1882                 .server = server,
1883                 .old_fattr = &old_fattr,
1884                 .new_fattr = &new_fattr,
1885         };
1886         struct rpc_message msg = {
1887                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1888                 .rpc_argp = &arg,
1889                 .rpc_resp = &res,
1890         };
1891         int                     status;
1892
1893         nfs_fattr_init(res.old_fattr);
1894         nfs_fattr_init(res.new_fattr);
1895         status = rpc_call_sync(server->client, &msg, 0);
1896
1897         if (!status) {
1898                 update_changeattr(old_dir, &res.old_cinfo);
1899                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1900                 update_changeattr(new_dir, &res.new_cinfo);
1901                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1902         }
1903         return status;
1904 }
1905
1906 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1907                 struct inode *new_dir, struct qstr *new_name)
1908 {
1909         struct nfs4_exception exception = { };
1910         int err;
1911         do {
1912                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1913                                 _nfs4_proc_rename(old_dir, old_name,
1914                                         new_dir, new_name),
1915                                 &exception);
1916         } while (exception.retry);
1917         return err;
1918 }
1919
1920 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1921 {
1922         struct nfs_server *server = NFS_SERVER(inode);
1923         struct nfs4_link_arg arg = {
1924                 .fh     = NFS_FH(inode),
1925                 .dir_fh = NFS_FH(dir),
1926                 .name   = name,
1927                 .bitmask = server->attr_bitmask,
1928         };
1929         struct nfs_fattr fattr, dir_attr;
1930         struct nfs4_link_res res = {
1931                 .server = server,
1932                 .fattr = &fattr,
1933                 .dir_attr = &dir_attr,
1934         };
1935         struct rpc_message msg = {
1936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1937                 .rpc_argp = &arg,
1938                 .rpc_resp = &res,
1939         };
1940         int                     status;
1941
1942         nfs_fattr_init(res.fattr);
1943         nfs_fattr_init(res.dir_attr);
1944         status = rpc_call_sync(server->client, &msg, 0);
1945         if (!status) {
1946                 update_changeattr(dir, &res.cinfo);
1947                 nfs_post_op_update_inode(dir, res.dir_attr);
1948                 nfs_refresh_inode(inode, res.fattr);
1949         }
1950
1951         return status;
1952 }
1953
1954 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1955 {
1956         struct nfs4_exception exception = { };
1957         int err;
1958         do {
1959                 err = nfs4_handle_exception(NFS_SERVER(inode),
1960                                 _nfs4_proc_link(inode, dir, name),
1961                                 &exception);
1962         } while (exception.retry);
1963         return err;
1964 }
1965
1966 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1967                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1968                 struct nfs_fattr *fattr)
1969 {
1970         struct nfs_server *server = NFS_SERVER(dir);
1971         struct nfs_fattr dir_fattr;
1972         struct nfs4_create_arg arg = {
1973                 .dir_fh = NFS_FH(dir),
1974                 .server = server,
1975                 .name = name,
1976                 .attrs = sattr,
1977                 .ftype = NF4LNK,
1978                 .bitmask = server->attr_bitmask,
1979         };
1980         struct nfs4_create_res res = {
1981                 .server = server,
1982                 .fh = fhandle,
1983                 .fattr = fattr,
1984                 .dir_fattr = &dir_fattr,
1985         };
1986         struct rpc_message msg = {
1987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1988                 .rpc_argp = &arg,
1989                 .rpc_resp = &res,
1990         };
1991         int                     status;
1992
1993         if (path->len > NFS4_MAXPATHLEN)
1994                 return -ENAMETOOLONG;
1995         arg.u.symlink = path;
1996         nfs_fattr_init(fattr);
1997         nfs_fattr_init(&dir_fattr);
1998
1999         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2000         if (!status)
2001                 update_changeattr(dir, &res.dir_cinfo);
2002         nfs_post_op_update_inode(dir, res.dir_fattr);
2003         return status;
2004 }
2005
2006 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2007                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2008                 struct nfs_fattr *fattr)
2009 {
2010         struct nfs4_exception exception = { };
2011         int err;
2012         do {
2013                 err = nfs4_handle_exception(NFS_SERVER(dir),
2014                                 _nfs4_proc_symlink(dir, name, path, sattr,
2015                                         fhandle, fattr),
2016                                 &exception);
2017         } while (exception.retry);
2018         return err;
2019 }
2020
2021 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2022                 struct iattr *sattr)
2023 {
2024         struct nfs_server *server = NFS_SERVER(dir);
2025         struct nfs_fh fhandle;
2026         struct nfs_fattr fattr, dir_fattr;
2027         struct nfs4_create_arg arg = {
2028                 .dir_fh = NFS_FH(dir),
2029                 .server = server,
2030                 .name = &dentry->d_name,
2031                 .attrs = sattr,
2032                 .ftype = NF4DIR,
2033                 .bitmask = server->attr_bitmask,
2034         };
2035         struct nfs4_create_res res = {
2036                 .server = server,
2037                 .fh = &fhandle,
2038                 .fattr = &fattr,
2039                 .dir_fattr = &dir_fattr,
2040         };
2041         struct rpc_message msg = {
2042                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2043                 .rpc_argp = &arg,
2044                 .rpc_resp = &res,
2045         };
2046         int                     status;
2047
2048         nfs_fattr_init(&fattr);
2049         nfs_fattr_init(&dir_fattr);
2050
2051         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2052         if (!status) {
2053                 update_changeattr(dir, &res.dir_cinfo);
2054                 nfs_post_op_update_inode(dir, res.dir_fattr);
2055                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2056         }
2057         return status;
2058 }
2059
2060 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2061                 struct iattr *sattr)
2062 {
2063         struct nfs4_exception exception = { };
2064         int err;
2065         do {
2066                 err = nfs4_handle_exception(NFS_SERVER(dir),
2067                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2068                                 &exception);
2069         } while (exception.retry);
2070         return err;
2071 }
2072
2073 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2074                   u64 cookie, struct page *page, unsigned int count, int plus)
2075 {
2076         struct inode            *dir = dentry->d_inode;
2077         struct nfs4_readdir_arg args = {
2078                 .fh = NFS_FH(dir),
2079                 .pages = &page,
2080                 .pgbase = 0,
2081                 .count = count,
2082                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2083         };
2084         struct nfs4_readdir_res res;
2085         struct rpc_message msg = {
2086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2087                 .rpc_argp = &args,
2088                 .rpc_resp = &res,
2089                 .rpc_cred = cred,
2090         };
2091         int                     status;
2092
2093         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2094                         dentry->d_parent->d_name.name,
2095                         dentry->d_name.name,
2096                         (unsigned long long)cookie);
2097         lock_kernel();
2098         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2099         res.pgbase = args.pgbase;
2100         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2101         if (status == 0)
2102                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2103         unlock_kernel();
2104         dprintk("%s: returns %d\n", __FUNCTION__, status);
2105         return status;
2106 }
2107
2108 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2109                   u64 cookie, struct page *page, unsigned int count, int plus)
2110 {
2111         struct nfs4_exception exception = { };
2112         int err;
2113         do {
2114                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2115                                 _nfs4_proc_readdir(dentry, cred, cookie,
2116                                         page, count, plus),
2117                                 &exception);
2118         } while (exception.retry);
2119         return err;
2120 }
2121
2122 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2123                 struct iattr *sattr, dev_t rdev)
2124 {
2125         struct nfs_server *server = NFS_SERVER(dir);
2126         struct nfs_fh fh;
2127         struct nfs_fattr fattr, dir_fattr;
2128         struct nfs4_create_arg arg = {
2129                 .dir_fh = NFS_FH(dir),
2130                 .server = server,
2131                 .name = &dentry->d_name,
2132                 .attrs = sattr,
2133                 .bitmask = server->attr_bitmask,
2134         };
2135         struct nfs4_create_res res = {
2136                 .server = server,
2137                 .fh = &fh,
2138                 .fattr = &fattr,
2139                 .dir_fattr = &dir_fattr,
2140         };
2141         struct rpc_message msg = {
2142                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2143                 .rpc_argp = &arg,
2144                 .rpc_resp = &res,
2145         };
2146         int                     status;
2147         int                     mode = sattr->ia_mode;
2148
2149         nfs_fattr_init(&fattr);
2150         nfs_fattr_init(&dir_fattr);
2151
2152         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2153         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2154         if (S_ISFIFO(mode))
2155                 arg.ftype = NF4FIFO;
2156         else if (S_ISBLK(mode)) {
2157                 arg.ftype = NF4BLK;
2158                 arg.u.device.specdata1 = MAJOR(rdev);
2159                 arg.u.device.specdata2 = MINOR(rdev);
2160         }
2161         else if (S_ISCHR(mode)) {
2162                 arg.ftype = NF4CHR;
2163                 arg.u.device.specdata1 = MAJOR(rdev);
2164                 arg.u.device.specdata2 = MINOR(rdev);
2165         }
2166         else
2167                 arg.ftype = NF4SOCK;
2168
2169         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2170         if (status == 0) {
2171                 update_changeattr(dir, &res.dir_cinfo);
2172                 nfs_post_op_update_inode(dir, res.dir_fattr);
2173                 status = nfs_instantiate(dentry, &fh, &fattr);
2174         }
2175         return status;
2176 }
2177
2178 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2179                 struct iattr *sattr, dev_t rdev)
2180 {
2181         struct nfs4_exception exception = { };
2182         int err;
2183         do {
2184                 err = nfs4_handle_exception(NFS_SERVER(dir),
2185                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2186                                 &exception);
2187         } while (exception.retry);
2188         return err;
2189 }
2190
2191 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2192                  struct nfs_fsstat *fsstat)
2193 {
2194         struct nfs4_statfs_arg args = {
2195                 .fh = fhandle,
2196                 .bitmask = server->attr_bitmask,
2197         };
2198         struct rpc_message msg = {
2199                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2200                 .rpc_argp = &args,
2201                 .rpc_resp = fsstat,
2202         };
2203
2204         nfs_fattr_init(fsstat->fattr);
2205         return rpc_call_sync(server->client, &msg, 0);
2206 }
2207
2208 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2209 {
2210         struct nfs4_exception exception = { };
2211         int err;
2212         do {
2213                 err = nfs4_handle_exception(server,
2214                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2215                                 &exception);
2216         } while (exception.retry);
2217         return err;
2218 }
2219
2220 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2221                 struct nfs_fsinfo *fsinfo)
2222 {
2223         struct nfs4_fsinfo_arg args = {
2224                 .fh = fhandle,
2225                 .bitmask = server->attr_bitmask,
2226         };
2227         struct rpc_message msg = {
2228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2229                 .rpc_argp = &args,
2230                 .rpc_resp = fsinfo,
2231         };
2232
2233         return rpc_call_sync(server->client, &msg, 0);
2234 }
2235
2236 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2237 {
2238         struct nfs4_exception exception = { };
2239         int err;
2240
2241         do {
2242                 err = nfs4_handle_exception(server,
2243                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2244                                 &exception);
2245         } while (exception.retry);
2246         return err;
2247 }
2248
2249 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2250 {
2251         nfs_fattr_init(fsinfo->fattr);
2252         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2253 }
2254
2255 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2256                 struct nfs_pathconf *pathconf)
2257 {
2258         struct nfs4_pathconf_arg args = {
2259                 .fh = fhandle,
2260                 .bitmask = server->attr_bitmask,
2261         };
2262         struct rpc_message msg = {
2263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2264                 .rpc_argp = &args,
2265                 .rpc_resp = pathconf,
2266         };
2267
2268         /* None of the pathconf attributes are mandatory to implement */
2269         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2270                 memset(pathconf, 0, sizeof(*pathconf));
2271                 return 0;
2272         }
2273
2274         nfs_fattr_init(pathconf->fattr);
2275         return rpc_call_sync(server->client, &msg, 0);
2276 }
2277
2278 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2279                 struct nfs_pathconf *pathconf)
2280 {
2281         struct nfs4_exception exception = { };
2282         int err;
2283
2284         do {
2285                 err = nfs4_handle_exception(server,
2286                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2287                                 &exception);
2288         } while (exception.retry);
2289         return err;
2290 }
2291
2292 static void nfs4_read_done(struct rpc_task *task, void *calldata)
2293 {
2294         struct nfs_read_data *data = calldata;
2295         struct inode *inode = data->inode;
2296
2297         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2298                 rpc_restart_call(task);
2299                 return;
2300         }
2301         if (task->tk_status > 0)
2302                 renew_lease(NFS_SERVER(inode), data->timestamp);
2303         /* Call back common NFS readpage processing */
2304         nfs_readpage_result(task, calldata);
2305 }
2306
2307 static const struct rpc_call_ops nfs4_read_ops = {
2308         .rpc_call_done = nfs4_read_done,
2309         .rpc_release = nfs_readdata_release,
2310 };
2311
2312 static void
2313 nfs4_proc_read_setup(struct nfs_read_data *data)
2314 {
2315         struct rpc_task *task = &data->task;
2316         struct rpc_message msg = {
2317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2318                 .rpc_argp = &data->args,
2319                 .rpc_resp = &data->res,
2320                 .rpc_cred = data->cred,
2321         };
2322         struct inode *inode = data->inode;
2323         int flags;
2324
2325         data->timestamp   = jiffies;
2326
2327         /* N.B. Do we need to test? Never called for swapfile inode */
2328         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2329
2330         /* Finalize the task. */
2331         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
2332         rpc_call_setup(task, &msg, 0);
2333 }
2334
2335 static void nfs4_write_done(struct rpc_task *task, void *calldata)
2336 {
2337         struct nfs_write_data *data = calldata;
2338         struct inode *inode = data->inode;
2339
2340         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2341                 rpc_restart_call(task);
2342                 return;
2343         }
2344         if (task->tk_status >= 0) {
2345                 renew_lease(NFS_SERVER(inode), data->timestamp);
2346                 nfs_post_op_update_inode(inode, data->res.fattr);
2347         }
2348         /* Call back common NFS writeback processing */
2349         nfs_writeback_done(task, calldata);
2350 }
2351
2352 static const struct rpc_call_ops nfs4_write_ops = {
2353         .rpc_call_done = nfs4_write_done,
2354         .rpc_release = nfs_writedata_release,
2355 };
2356
2357 static void
2358 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2359 {
2360         struct rpc_task *task = &data->task;
2361         struct rpc_message msg = {
2362                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2363                 .rpc_argp = &data->args,
2364                 .rpc_resp = &data->res,
2365                 .rpc_cred = data->cred,
2366         };
2367         struct inode *inode = data->inode;
2368         struct nfs_server *server = NFS_SERVER(inode);
2369         int stable;
2370         int flags;
2371
2372         if (how & FLUSH_STABLE) {
2373                 if (!NFS_I(inode)->ncommit)
2374                         stable = NFS_FILE_SYNC;
2375                 else
2376                         stable = NFS_DATA_SYNC;
2377         } else
2378                 stable = NFS_UNSTABLE;
2379         data->args.stable = stable;
2380         data->args.bitmask = server->attr_bitmask;
2381         data->res.server = server;
2382
2383         data->timestamp   = jiffies;
2384
2385         /* Set the initial flags for the task.  */
2386         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2387
2388         /* Finalize the task. */
2389         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_write_ops, data);
2390         rpc_call_setup(task, &msg, 0);
2391 }
2392
2393 static void nfs4_commit_done(struct rpc_task *task, void *calldata)
2394 {
2395         struct nfs_write_data *data = calldata;
2396         struct inode *inode = data->inode;
2397
2398         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2399                 rpc_restart_call(task);
2400                 return;
2401         }
2402         if (task->tk_status >= 0)
2403                 nfs_post_op_update_inode(inode, data->res.fattr);
2404         /* Call back common NFS writeback processing */
2405         nfs_commit_done(task, calldata);
2406 }
2407
2408 static const struct rpc_call_ops nfs4_commit_ops = {
2409         .rpc_call_done = nfs4_commit_done,
2410         .rpc_release = nfs_commit_release,
2411 };
2412
2413 static void
2414 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2415 {
2416         struct rpc_task *task = &data->task;
2417         struct rpc_message msg = {
2418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2419                 .rpc_argp = &data->args,
2420                 .rpc_resp = &data->res,
2421                 .rpc_cred = data->cred,
2422         };
2423         struct inode *inode = data->inode;
2424         struct nfs_server *server = NFS_SERVER(inode);
2425         int flags;
2426
2427         data->args.bitmask = server->attr_bitmask;
2428         data->res.server = server;
2429
2430         /* Set the initial flags for the task.  */
2431         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2432
2433         /* Finalize the task. */
2434         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_commit_ops, data);
2435         rpc_call_setup(task, &msg, 0);
2436 }
2437
2438 /*
2439  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2440  * standalone procedure for queueing an asynchronous RENEW.
2441  */
2442 static void nfs4_renew_done(struct rpc_task *task, void *data)
2443 {
2444         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2445         unsigned long timestamp = (unsigned long)data;
2446
2447         if (task->tk_status < 0) {
2448                 switch (task->tk_status) {
2449                         case -NFS4ERR_STALE_CLIENTID:
2450                         case -NFS4ERR_EXPIRED:
2451                         case -NFS4ERR_CB_PATH_DOWN:
2452                                 nfs4_schedule_state_recovery(clp);
2453                 }
2454                 return;
2455         }
2456         spin_lock(&clp->cl_lock);
2457         if (time_before(clp->cl_last_renewal,timestamp))
2458                 clp->cl_last_renewal = timestamp;
2459         spin_unlock(&clp->cl_lock);
2460 }
2461
2462 static const struct rpc_call_ops nfs4_renew_ops = {
2463         .rpc_call_done = nfs4_renew_done,
2464 };
2465
2466 int
2467 nfs4_proc_async_renew(struct nfs4_client *clp)
2468 {
2469         struct rpc_message msg = {
2470                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2471                 .rpc_argp       = clp,
2472                 .rpc_cred       = clp->cl_cred,
2473         };
2474
2475         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2476                         &nfs4_renew_ops, (void *)jiffies);
2477 }
2478
2479 int
2480 nfs4_proc_renew(struct nfs4_client *clp)
2481 {
2482         struct rpc_message msg = {
2483                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2484                 .rpc_argp       = clp,
2485                 .rpc_cred       = clp->cl_cred,
2486         };
2487         unsigned long now = jiffies;
2488         int status;
2489
2490         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2491         if (status < 0)
2492                 return status;
2493         spin_lock(&clp->cl_lock);
2494         if (time_before(clp->cl_last_renewal,now))
2495                 clp->cl_last_renewal = now;
2496         spin_unlock(&clp->cl_lock);
2497         return 0;
2498 }
2499
2500 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2501 {
2502         return (server->caps & NFS_CAP_ACLS)
2503                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2504                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2505 }
2506
2507 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2508  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2509  * the stack.
2510  */
2511 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2512
2513 static void buf_to_pages(const void *buf, size_t buflen,
2514                 struct page **pages, unsigned int *pgbase)
2515 {
2516         const void *p = buf;
2517
2518         *pgbase = offset_in_page(buf);
2519         p -= *pgbase;
2520         while (p < buf + buflen) {
2521                 *(pages++) = virt_to_page(p);
2522                 p += PAGE_CACHE_SIZE;
2523         }
2524 }
2525
2526 struct nfs4_cached_acl {
2527         int cached;
2528         size_t len;
2529         char data[0];
2530 };
2531
2532 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2533 {
2534         struct nfs_inode *nfsi = NFS_I(inode);
2535
2536         spin_lock(&inode->i_lock);
2537         kfree(nfsi->nfs4_acl);
2538         nfsi->nfs4_acl = acl;
2539         spin_unlock(&inode->i_lock);
2540 }
2541
2542 static void nfs4_zap_acl_attr(struct inode *inode)
2543 {
2544         nfs4_set_cached_acl(inode, NULL);
2545 }
2546
2547 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2548 {
2549         struct nfs_inode *nfsi = NFS_I(inode);
2550         struct nfs4_cached_acl *acl;
2551         int ret = -ENOENT;
2552
2553         spin_lock(&inode->i_lock);
2554         acl = nfsi->nfs4_acl;
2555         if (acl == NULL)
2556                 goto out;
2557         if (buf == NULL) /* user is just asking for length */
2558                 goto out_len;
2559         if (acl->cached == 0)
2560                 goto out;
2561         ret = -ERANGE; /* see getxattr(2) man page */
2562         if (acl->len > buflen)
2563                 goto out;
2564         memcpy(buf, acl->data, acl->len);
2565 out_len:
2566         ret = acl->len;
2567 out:
2568         spin_unlock(&inode->i_lock);
2569         return ret;
2570 }
2571
2572 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2573 {
2574         struct nfs4_cached_acl *acl;
2575
2576         if (buf && acl_len <= PAGE_SIZE) {
2577                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2578                 if (acl == NULL)
2579                         goto out;
2580                 acl->cached = 1;
2581                 memcpy(acl->data, buf, acl_len);
2582         } else {
2583                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2584                 if (acl == NULL)
2585                         goto out;
2586                 acl->cached = 0;
2587         }
2588         acl->len = acl_len;
2589 out:
2590         nfs4_set_cached_acl(inode, acl);
2591 }
2592
2593 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2594 {
2595         struct page *pages[NFS4ACL_MAXPAGES];
2596         struct nfs_getaclargs args = {
2597                 .fh = NFS_FH(inode),
2598                 .acl_pages = pages,
2599                 .acl_len = buflen,
2600         };
2601         size_t resp_len = buflen;
2602         void *resp_buf;
2603         struct rpc_message msg = {
2604                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2605                 .rpc_argp = &args,
2606                 .rpc_resp = &resp_len,
2607         };
2608         struct page *localpage = NULL;
2609         int ret;
2610
2611         if (buflen < PAGE_SIZE) {
2612                 /* As long as we're doing a round trip to the server anyway,
2613                  * let's be prepared for a page of acl data. */
2614                 localpage = alloc_page(GFP_KERNEL);
2615                 resp_buf = page_address(localpage);
2616                 if (localpage == NULL)
2617                         return -ENOMEM;
2618                 args.acl_pages[0] = localpage;
2619                 args.acl_pgbase = 0;
2620                 resp_len = args.acl_len = PAGE_SIZE;
2621         } else {
2622                 resp_buf = buf;
2623                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2624         }
2625         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2626         if (ret)
2627                 goto out_free;
2628         if (resp_len > args.acl_len)
2629                 nfs4_write_cached_acl(inode, NULL, resp_len);
2630         else
2631                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2632         if (buf) {
2633                 ret = -ERANGE;
2634                 if (resp_len > buflen)
2635                         goto out_free;
2636                 if (localpage)
2637                         memcpy(buf, resp_buf, resp_len);
2638         }
2639         ret = resp_len;
2640 out_free:
2641         if (localpage)
2642                 __free_page(localpage);
2643         return ret;
2644 }
2645
2646 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2647 {
2648         struct nfs_server *server = NFS_SERVER(inode);
2649         int ret;
2650
2651         if (!nfs4_server_supports_acls(server))
2652                 return -EOPNOTSUPP;
2653         ret = nfs_revalidate_inode(server, inode);
2654         if (ret < 0)
2655                 return ret;
2656         ret = nfs4_read_cached_acl(inode, buf, buflen);
2657         if (ret != -ENOENT)
2658                 return ret;
2659         return nfs4_get_acl_uncached(inode, buf, buflen);
2660 }
2661
2662 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2663 {
2664         struct nfs_server *server = NFS_SERVER(inode);
2665         struct page *pages[NFS4ACL_MAXPAGES];
2666         struct nfs_setaclargs arg = {
2667                 .fh             = NFS_FH(inode),
2668                 .acl_pages      = pages,
2669                 .acl_len        = buflen,
2670         };
2671         struct rpc_message msg = {
2672                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2673                 .rpc_argp       = &arg,
2674                 .rpc_resp       = NULL,
2675         };
2676         int ret;
2677
2678         if (!nfs4_server_supports_acls(server))
2679                 return -EOPNOTSUPP;
2680         nfs_inode_return_delegation(inode);
2681         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2682         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2683         if (ret == 0)
2684                 nfs4_write_cached_acl(inode, buf, buflen);
2685         return ret;
2686 }
2687
2688 static int
2689 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2690 {
2691         struct nfs4_client *clp = server->nfs4_state;
2692
2693         if (!clp || task->tk_status >= 0)
2694                 return 0;
2695         switch(task->tk_status) {
2696                 case -NFS4ERR_STALE_CLIENTID:
2697                 case -NFS4ERR_STALE_STATEID:
2698                 case -NFS4ERR_EXPIRED:
2699                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2700                         nfs4_schedule_state_recovery(clp);
2701                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2702                                 rpc_wake_up_task(task);
2703                         task->tk_status = 0;
2704                         return -EAGAIN;
2705                 case -NFS4ERR_GRACE:
2706                 case -NFS4ERR_DELAY:
2707                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2708                         task->tk_status = 0;
2709                         return -EAGAIN;
2710                 case -NFS4ERR_OLD_STATEID:
2711                         task->tk_status = 0;
2712                         return -EAGAIN;
2713         }
2714         task->tk_status = nfs4_map_errors(task->tk_status);
2715         return 0;
2716 }
2717
2718 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2719 {
2720         DEFINE_WAIT(wait);
2721         sigset_t oldset;
2722         int interruptible, res = 0;
2723
2724         might_sleep();
2725
2726         rpc_clnt_sigmask(clnt, &oldset);
2727         interruptible = TASK_UNINTERRUPTIBLE;
2728         if (clnt->cl_intr)
2729                 interruptible = TASK_INTERRUPTIBLE;
2730         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2731         nfs4_schedule_state_recovery(clp);
2732         if (clnt->cl_intr && signalled())
2733                 res = -ERESTARTSYS;
2734         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2735                 schedule();
2736         finish_wait(&clp->cl_waitq, &wait);
2737         rpc_clnt_sigunmask(clnt, &oldset);
2738         return res;
2739 }
2740
2741 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2742 {
2743         sigset_t oldset;
2744         int res = 0;
2745
2746         might_sleep();
2747
2748         if (*timeout <= 0)
2749                 *timeout = NFS4_POLL_RETRY_MIN;
2750         if (*timeout > NFS4_POLL_RETRY_MAX)
2751                 *timeout = NFS4_POLL_RETRY_MAX;
2752         rpc_clnt_sigmask(clnt, &oldset);
2753         if (clnt->cl_intr) {
2754                 schedule_timeout_interruptible(*timeout);
2755                 if (signalled())
2756                         res = -ERESTARTSYS;
2757         } else
2758                 schedule_timeout_uninterruptible(*timeout);
2759         rpc_clnt_sigunmask(clnt, &oldset);
2760         *timeout <<= 1;
2761         return res;
2762 }
2763
2764 /* This is the error handling routine for processes that are allowed
2765  * to sleep.
2766  */
2767 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2768 {
2769         struct nfs4_client *clp = server->nfs4_state;
2770         int ret = errorcode;
2771
2772         exception->retry = 0;
2773         switch(errorcode) {
2774                 case 0:
2775                         return 0;
2776                 case -NFS4ERR_STALE_CLIENTID:
2777                 case -NFS4ERR_STALE_STATEID:
2778                 case -NFS4ERR_EXPIRED:
2779                         ret = nfs4_wait_clnt_recover(server->client, clp);
2780                         if (ret == 0)
2781                                 exception->retry = 1;
2782                         break;
2783                 case -NFS4ERR_GRACE:
2784                 case -NFS4ERR_DELAY:
2785                         ret = nfs4_delay(server->client, &exception->timeout);
2786                         if (ret != 0)
2787                                 break;
2788                 case -NFS4ERR_OLD_STATEID:
2789                         exception->retry = 1;
2790         }
2791         /* We failed to handle the error */
2792         return nfs4_map_errors(ret);
2793 }
2794
2795 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2796 {
2797         nfs4_verifier sc_verifier;
2798         struct nfs4_setclientid setclientid = {
2799                 .sc_verifier = &sc_verifier,
2800                 .sc_prog = program,
2801         };
2802         struct rpc_message msg = {
2803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2804                 .rpc_argp = &setclientid,
2805                 .rpc_resp = clp,
2806                 .rpc_cred = clp->cl_cred,
2807         };
2808         u32 *p;
2809         int loop = 0;
2810         int status;
2811
2812         p = (u32*)sc_verifier.data;
2813         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2814         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2815
2816         for(;;) {
2817                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2818                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2819                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2820                                 clp->cl_cred->cr_ops->cr_name,
2821                                 clp->cl_id_uniquifier);
2822                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2823                                 sizeof(setclientid.sc_netid), "tcp");
2824                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2825                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2826                                 clp->cl_ipaddr, port >> 8, port & 255);
2827
2828                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2829                 if (status != -NFS4ERR_CLID_INUSE)
2830                         break;
2831                 if (signalled())
2832                         break;
2833                 if (loop++ & 1)
2834                         ssleep(clp->cl_lease_time + 1);
2835                 else
2836                         if (++clp->cl_id_uniquifier == 0)
2837                                 break;
2838         }
2839         return status;
2840 }
2841
2842 int
2843 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2844 {
2845         struct nfs_fsinfo fsinfo;
2846         struct rpc_message msg = {
2847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2848                 .rpc_argp = clp,
2849                 .rpc_resp = &fsinfo,
2850                 .rpc_cred = clp->cl_cred,
2851         };
2852         unsigned long now;
2853         int status;
2854
2855         now = jiffies;
2856         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2857         if (status == 0) {
2858                 spin_lock(&clp->cl_lock);
2859                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2860                 clp->cl_last_renewal = now;
2861                 spin_unlock(&clp->cl_lock);
2862         }
2863         return status;
2864 }
2865
2866 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2867 {
2868         struct nfs4_delegreturnargs args = {
2869                 .fhandle = NFS_FH(inode),
2870                 .stateid = stateid,
2871         };
2872         struct rpc_message msg = {
2873                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2874                 .rpc_argp = &args,
2875                 .rpc_cred = cred,
2876         };
2877
2878         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2879 }
2880
2881 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2882 {
2883         struct nfs_server *server = NFS_SERVER(inode);
2884         struct nfs4_exception exception = { };
2885         int err;
2886         do {
2887                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2888                 switch (err) {
2889                         case -NFS4ERR_STALE_STATEID:
2890                         case -NFS4ERR_EXPIRED:
2891                                 nfs4_schedule_state_recovery(server->nfs4_state);
2892                         case 0:
2893                                 return 0;
2894                 }
2895                 err = nfs4_handle_exception(server, err, &exception);
2896         } while (exception.retry);
2897         return err;
2898 }
2899
2900 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2901 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2902
2903 /*
2904  * sleep, with exponential backoff, and retry the LOCK operation.
2905  */
2906 static unsigned long
2907 nfs4_set_lock_task_retry(unsigned long timeout)
2908 {
2909         schedule_timeout_interruptible(timeout);
2910         timeout <<= 1;
2911         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2912                 return NFS4_LOCK_MAXTIMEOUT;
2913         return timeout;
2914 }
2915
2916 static inline int
2917 nfs4_lck_type(int cmd, struct file_lock *request)
2918 {
2919         /* set lock type */
2920         switch (request->fl_type) {
2921                 case F_RDLCK:
2922                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2923                 case F_WRLCK:
2924                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2925                 case F_UNLCK:
2926                         return NFS4_WRITE_LT;
2927         }
2928         BUG();
2929         return 0;
2930 }
2931
2932 static inline uint64_t
2933 nfs4_lck_length(struct file_lock *request)
2934 {
2935         if (request->fl_end == OFFSET_MAX)
2936                 return ~(uint64_t)0;
2937         return request->fl_end - request->fl_start + 1;
2938 }
2939
2940 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2941 {
2942         struct inode *inode = state->inode;
2943         struct nfs_server *server = NFS_SERVER(inode);
2944         struct nfs4_client *clp = server->nfs4_state;
2945         struct nfs_lockargs arg = {
2946                 .fh = NFS_FH(inode),
2947                 .type = nfs4_lck_type(cmd, request),
2948                 .offset = request->fl_start,
2949                 .length = nfs4_lck_length(request),
2950         };
2951         struct nfs_lockres res = {
2952                 .server = server,
2953         };
2954         struct rpc_message msg = {
2955                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2956                 .rpc_argp       = &arg,
2957                 .rpc_resp       = &res,
2958                 .rpc_cred       = state->owner->so_cred,
2959         };
2960         struct nfs_lowner nlo;
2961         struct nfs4_lock_state *lsp;
2962         int status;
2963
2964         down_read(&clp->cl_sem);
2965         nlo.clientid = clp->cl_clientid;
2966         status = nfs4_set_lock_state(state, request);
2967         if (status != 0)
2968                 goto out;
2969         lsp = request->fl_u.nfs4_fl.owner;
2970         nlo.id = lsp->ls_id;
2971         arg.u.lockt = &nlo;
2972         status = rpc_call_sync(server->client, &msg, 0);
2973         if (!status) {
2974                 request->fl_type = F_UNLCK;
2975         } else if (status == -NFS4ERR_DENIED) {
2976                 int64_t len, start, end;
2977                 start = res.u.denied.offset;
2978                 len = res.u.denied.length;
2979                 end = start + len - 1;
2980                 if (end < 0 || len == 0)
2981                         request->fl_end = OFFSET_MAX;
2982                 else
2983                         request->fl_end = (loff_t)end;
2984                 request->fl_start = (loff_t)start;
2985                 request->fl_type = F_WRLCK;
2986                 if (res.u.denied.type & 1)
2987                         request->fl_type = F_RDLCK;
2988                 request->fl_pid = 0;
2989                 status = 0;
2990         }
2991 out:
2992         up_read(&clp->cl_sem);
2993         return status;
2994 }
2995
2996 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2997 {
2998         struct nfs4_exception exception = { };
2999         int err;
3000
3001         do {
3002                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3003                                 _nfs4_proc_getlk(state, cmd, request),
3004                                 &exception);
3005         } while (exception.retry);
3006         return err;
3007 }
3008
3009 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3010 {
3011         int res = 0;
3012         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3013                 case FL_POSIX:
3014                         res = posix_lock_file_wait(file, fl);
3015                         break;
3016                 case FL_FLOCK:
3017                         res = flock_lock_file_wait(file, fl);
3018                         break;
3019                 default:
3020                         BUG();
3021         }
3022         if (res < 0)
3023                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
3024                                 __FUNCTION__);
3025         return res;
3026 }
3027
3028 struct nfs4_unlockdata {
3029         struct nfs_lockargs arg;
3030         struct nfs_locku_opargs luargs;
3031         struct nfs_lockres res;
3032         struct nfs4_lock_state *lsp;
3033         struct nfs_open_context *ctx;
3034 };
3035
3036 static void nfs4_locku_release_calldata(void *data)
3037 {
3038         struct nfs4_unlockdata *calldata = data;
3039         nfs_free_seqid(calldata->luargs.seqid);
3040         nfs4_put_lock_state(calldata->lsp);
3041         put_nfs_open_context(calldata->ctx);
3042         kfree(calldata);
3043 }
3044
3045 static void nfs4_locku_done(struct rpc_task *task, void *data)
3046 {
3047         struct nfs4_unlockdata *calldata = data;
3048
3049         if (RPC_ASSASSINATED(task))
3050                 return;
3051         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
3052         switch (task->tk_status) {
3053                 case 0:
3054                         memcpy(calldata->lsp->ls_stateid.data,
3055                                         calldata->res.u.stateid.data,
3056                                         sizeof(calldata->lsp->ls_stateid.data));
3057                         break;
3058                 case -NFS4ERR_STALE_STATEID:
3059                 case -NFS4ERR_EXPIRED:
3060                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
3061                         break;
3062                 default:
3063                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
3064                                 rpc_restart_call(task);
3065                         }
3066         }
3067 }
3068
3069 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3070 {
3071         struct nfs4_unlockdata *calldata = data;
3072         struct rpc_message msg = {
3073                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3074                 .rpc_argp       = &calldata->arg,
3075                 .rpc_resp       = &calldata->res,
3076                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3077         };
3078         int status;
3079
3080         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
3081         if (status != 0)
3082                 return;
3083         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3084                 /* Note: exit _without_ running nfs4_locku_done */
3085                 task->tk_action = NULL;
3086                 return;
3087         }
3088         rpc_call_setup(task, &msg, 0);
3089 }
3090
3091 static const struct rpc_call_ops nfs4_locku_ops = {
3092         .rpc_call_prepare = nfs4_locku_prepare,
3093         .rpc_call_done = nfs4_locku_done,
3094         .rpc_release = nfs4_locku_release_calldata,
3095 };
3096
3097 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3098 {
3099         struct nfs4_unlockdata *calldata;
3100         struct inode *inode = state->inode;
3101         struct nfs_server *server = NFS_SERVER(inode);
3102         struct nfs4_lock_state *lsp;
3103         struct rpc_task *task;
3104         int status = 0;
3105
3106         /* Is this a delegated lock? */
3107         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3108                 goto out;
3109
3110         status = nfs4_set_lock_state(state, request);
3111         if (status != 0)
3112                 goto out;
3113         lsp = request->fl_u.nfs4_fl.owner;
3114         /* We might have lost the locks! */
3115         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
3116                 goto out;
3117         status = -ENOMEM;
3118         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
3119         if (calldata == NULL)
3120                 goto out;
3121         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3122         if (calldata->luargs.seqid == NULL) {
3123                 kfree(calldata);
3124                 goto out;
3125         }
3126         calldata->luargs.stateid = &lsp->ls_stateid;
3127         calldata->arg.fh = NFS_FH(inode);
3128         calldata->arg.type = nfs4_lck_type(cmd, request);
3129         calldata->arg.offset = request->fl_start;
3130         calldata->arg.length = nfs4_lck_length(request);
3131         calldata->arg.u.locku = &calldata->luargs;
3132         calldata->res.server = server;
3133         calldata->lsp = lsp;
3134         atomic_inc(&lsp->ls_count);
3135
3136         /* Ensure we don't close file until we're done freeing locks! */
3137         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
3138
3139         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_locku_ops, calldata);
3140         if (!IS_ERR(task)) {
3141                 status = nfs4_wait_for_completion_rpc_task(task);
3142                 rpc_release_task(task);
3143         } else {
3144                 status = PTR_ERR(task);
3145                 nfs4_locku_release_calldata(calldata);
3146         }
3147 out:
3148         do_vfs_lock(request->fl_file, request);
3149         return status;
3150 }
3151
3152 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
3153 {
3154         struct inode *inode = state->inode;
3155         struct nfs_server *server = NFS_SERVER(inode);
3156         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
3157         struct nfs_lock_opargs largs = {
3158                 .lock_stateid = &lsp->ls_stateid,
3159                 .open_stateid = &state->stateid,
3160                 .lock_owner = {
3161                         .clientid = server->nfs4_state->cl_clientid,
3162                         .id = lsp->ls_id,
3163                 },
3164                 .reclaim = reclaim,
3165         };
3166         struct nfs_lockargs arg = {
3167                 .fh = NFS_FH(inode),
3168                 .type = nfs4_lck_type(cmd, request),
3169                 .offset = request->fl_start,
3170                 .length = nfs4_lck_length(request),
3171                 .u = {
3172                         .lock = &largs,
3173                 },
3174         };
3175         struct nfs_lockres res = {
3176                 .server = server,
3177         };
3178         struct rpc_message msg = {
3179                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3180                 .rpc_argp       = &arg,
3181                 .rpc_resp       = &res,
3182                 .rpc_cred       = state->owner->so_cred,
3183         };
3184         int status = -ENOMEM;
3185
3186         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3187         if (largs.lock_seqid == NULL)
3188                 return -ENOMEM;
3189         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3190                 struct nfs4_state_owner *owner = state->owner;
3191
3192                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3193                 if (largs.open_seqid == NULL)
3194                         goto out;
3195                 largs.new_lock_owner = 1;
3196                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3197                 /* increment open seqid on success, and seqid mutating errors */
3198                 if (largs.new_lock_owner != 0) {
3199                         nfs_increment_open_seqid(status, largs.open_seqid);
3200                         if (status == 0)
3201                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
3202                 }
3203                 nfs_free_seqid(largs.open_seqid);
3204         } else
3205                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3206         /* increment lock seqid on success, and seqid mutating errors*/
3207         nfs_increment_lock_seqid(status, largs.lock_seqid);
3208         /* save the returned stateid. */
3209         if (status == 0) {
3210                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3211                                 sizeof(lsp->ls_stateid.data));
3212                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3213         } else if (status == -NFS4ERR_DENIED)
3214                 status = -EAGAIN;
3215 out:
3216         nfs_free_seqid(largs.lock_seqid);
3217         return status;
3218 }
3219
3220 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3221 {
3222         struct nfs_server *server = NFS_SERVER(state->inode);
3223         struct nfs4_exception exception = { };
3224         int err;
3225
3226         /* Cache the lock if possible... */
3227         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3228                 return 0;
3229         do {
3230                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3231                 if (err != -NFS4ERR_DELAY)
3232                         break;
3233                 nfs4_handle_exception(server, err, &exception);
3234         } while (exception.retry);
3235         return err;
3236 }
3237
3238 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3239 {
3240         struct nfs_server *server = NFS_SERVER(state->inode);
3241         struct nfs4_exception exception = { };
3242         int err;
3243
3244         err = nfs4_set_lock_state(state, request);
3245         if (err != 0)
3246                 return err;
3247         do {
3248                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3249                 if (err != -NFS4ERR_DELAY)
3250                         break;
3251                 nfs4_handle_exception(server, err, &exception);
3252         } while (exception.retry);
3253         return err;
3254 }
3255
3256 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3257 {
3258         struct nfs4_client *clp = state->owner->so_client;
3259         int status;
3260
3261         /* Is this a delegated open? */
3262         if (NFS_I(state->inode)->delegation_state != 0) {
3263                 /* Yes: cache locks! */
3264                 status = do_vfs_lock(request->fl_file, request);
3265                 /* ...but avoid races with delegation recall... */
3266                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3267                         return status;
3268         }
3269         down_read(&clp->cl_sem);
3270         status = nfs4_set_lock_state(state, request);
3271         if (status != 0)
3272                 goto out;
3273         status = _nfs4_do_setlk(state, cmd, request, 0);
3274         if (status != 0)
3275                 goto out;
3276         /* Note: we always want to sleep here! */
3277         request->fl_flags |= FL_SLEEP;
3278         if (do_vfs_lock(request->fl_file, request) < 0)
3279                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3280 out:
3281         up_read(&clp->cl_sem);
3282         return status;
3283 }
3284
3285 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3286 {
3287         struct nfs4_exception exception = { };
3288         int err;
3289
3290         do {
3291                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3292                                 _nfs4_proc_setlk(state, cmd, request),
3293                                 &exception);
3294         } while (exception.retry);
3295         return err;
3296 }
3297
3298 static int
3299 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3300 {
3301         struct nfs_open_context *ctx;
3302         struct nfs4_state *state;
3303         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3304         int status;
3305
3306         /* verify open state */
3307         ctx = (struct nfs_open_context *)filp->private_data;
3308         state = ctx->state;
3309
3310         if (request->fl_start < 0 || request->fl_end < 0)
3311                 return -EINVAL;
3312
3313         if (IS_GETLK(cmd))
3314                 return nfs4_proc_getlk(state, F_GETLK, request);
3315
3316         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3317                 return -EINVAL;
3318
3319         if (request->fl_type == F_UNLCK)
3320                 return nfs4_proc_unlck(state, cmd, request);
3321
3322         do {
3323                 status = nfs4_proc_setlk(state, cmd, request);
3324                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3325                         break;
3326                 timeout = nfs4_set_lock_task_retry(timeout);
3327                 status = -ERESTARTSYS;
3328                 if (signalled())
3329                         break;
3330         } while(status < 0);
3331         return status;
3332 }
3333
3334 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3335 {
3336         struct nfs_server *server = NFS_SERVER(state->inode);
3337         struct nfs4_exception exception = { };
3338         int err;
3339
3340         err = nfs4_set_lock_state(state, fl);
3341         if (err != 0)
3342                 goto out;
3343         do {
3344                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3345                 if (err != -NFS4ERR_DELAY)
3346                         break;
3347                 err = nfs4_handle_exception(server, err, &exception);
3348         } while (exception.retry);
3349 out:
3350         return err;
3351 }
3352
3353 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3354
3355 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3356                 size_t buflen, int flags)
3357 {
3358         struct inode *inode = dentry->d_inode;
3359
3360         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3361                 return -EOPNOTSUPP;
3362
3363         if (!S_ISREG(inode->i_mode) &&
3364             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3365                 return -EPERM;
3366
3367         return nfs4_proc_set_acl(inode, buf, buflen);
3368 }
3369
3370 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3371  * and that's what we'll do for e.g. user attributes that haven't been set.
3372  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3373  * attributes in kernel-managed attribute namespaces. */
3374 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3375                 size_t buflen)
3376 {
3377         struct inode *inode = dentry->d_inode;
3378
3379         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3380                 return -EOPNOTSUPP;
3381
3382         return nfs4_proc_get_acl(inode, buf, buflen);
3383 }
3384
3385 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3386 {
3387         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3388
3389         if (buf && buflen < len)
3390                 return -ERANGE;
3391         if (buf)
3392                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3393         return len;
3394 }
3395
3396 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3397         .recover_open   = nfs4_open_reclaim,
3398         .recover_lock   = nfs4_lock_reclaim,
3399 };
3400
3401 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3402         .recover_open   = nfs4_open_expired,
3403         .recover_lock   = nfs4_lock_expired,
3404 };
3405
3406 static struct inode_operations nfs4_file_inode_operations = {
3407         .permission     = nfs_permission,
3408         .getattr        = nfs_getattr,
3409         .setattr        = nfs_setattr,
3410         .getxattr       = nfs4_getxattr,
3411         .setxattr       = nfs4_setxattr,
3412         .listxattr      = nfs4_listxattr,
3413 };
3414
3415 struct nfs_rpc_ops      nfs_v4_clientops = {
3416         .version        = 4,                    /* protocol version */
3417         .dentry_ops     = &nfs4_dentry_operations,
3418         .dir_inode_ops  = &nfs4_dir_inode_operations,
3419         .file_inode_ops = &nfs4_file_inode_operations,
3420         .getroot        = nfs4_proc_get_root,
3421         .getattr        = nfs4_proc_getattr,
3422         .setattr        = nfs4_proc_setattr,
3423         .lookup         = nfs4_proc_lookup,
3424         .access         = nfs4_proc_access,
3425         .readlink       = nfs4_proc_readlink,
3426         .read           = nfs4_proc_read,
3427         .write          = nfs4_proc_write,
3428         .commit         = nfs4_proc_commit,
3429         .create         = nfs4_proc_create,
3430         .remove         = nfs4_proc_remove,
3431         .unlink_setup   = nfs4_proc_unlink_setup,
3432         .unlink_done    = nfs4_proc_unlink_done,
3433         .rename         = nfs4_proc_rename,
3434         .link           = nfs4_proc_link,
3435         .symlink        = nfs4_proc_symlink,
3436         .mkdir          = nfs4_proc_mkdir,
3437         .rmdir          = nfs4_proc_remove,
3438         .readdir        = nfs4_proc_readdir,
3439         .mknod          = nfs4_proc_mknod,
3440         .statfs         = nfs4_proc_statfs,
3441         .fsinfo         = nfs4_proc_fsinfo,
3442         .pathconf       = nfs4_proc_pathconf,
3443         .decode_dirent  = nfs4_decode_dirent,
3444         .read_setup     = nfs4_proc_read_setup,
3445         .write_setup    = nfs4_proc_write_setup,
3446         .commit_setup   = nfs4_proc_commit_setup,
3447         .file_open      = nfs_open,
3448         .file_release   = nfs_release,
3449         .lock           = nfs4_proc_lock,
3450         .clear_acl_cache = nfs4_zap_acl_attr,
3451 };
3452
3453 /*
3454  * Local variables:
3455  *  c-basic-offset: 8
3456  * End:
3457  */