projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
SUNRPC: Yet more RPC cleanups
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
CommitLineData
1da177e4
LT		 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>
02a913a7 50#include <linux/mount.h>
1da177e4 51
4ce79717 52#include "nfs4_fs.h"
1da177e4
LT		 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
0a8838f9 60static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
1da177e4 61static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
faf5f49c 62static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
1da177e4 63static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
faf5f49c 64static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
1da177e4
LT		 65extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
66extern struct rpc_procinfo nfs4_procedures[];
67
1da177e4
LT		 68/* Prevent leaks of NFSv4 errors into userland */
69int nfs4_map_errors(int err)
70{
71 if (err < -1000) {
72 dprintk("%s could not handle NFSv4 error %d\n",
73 __FUNCTION__, -err);
74 return -EIO;
75 }
76 return err;
77}
78
79/*
80 * This is our standard bitmap for GETATTR requests.
81 */
82const u32 nfs4_fattr_bitmap[2] = {
83 FATTR4_WORD0_TYPE
84 | FATTR4_WORD0_CHANGE
85 | FATTR4_WORD0_SIZE
86 | FATTR4_WORD0_FSID
87 | FATTR4_WORD0_FILEID,
88 FATTR4_WORD1_MODE
89 | FATTR4_WORD1_NUMLINKS
90 | FATTR4_WORD1_OWNER
91 | FATTR4_WORD1_OWNER_GROUP
92 | FATTR4_WORD1_RAWDEV
93 | FATTR4_WORD1_SPACE_USED
94 | FATTR4_WORD1_TIME_ACCESS
95 | FATTR4_WORD1_TIME_METADATA
96 | FATTR4_WORD1_TIME_MODIFY
97};
98
99const u32 nfs4_statfs_bitmap[2] = {
100 FATTR4_WORD0_FILES_AVAIL
101 | FATTR4_WORD0_FILES_FREE
102 | FATTR4_WORD0_FILES_TOTAL,
103 FATTR4_WORD1_SPACE_AVAIL
104 | FATTR4_WORD1_SPACE_FREE
105 | FATTR4_WORD1_SPACE_TOTAL
106};
107
4ce79717 108const u32 nfs4_pathconf_bitmap[2] = {
1da177e4
LT		 109 FATTR4_WORD0_MAXLINK
110 | FATTR4_WORD0_MAXNAME,
111 0
112};
113
114const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
115 | FATTR4_WORD0_MAXREAD
116 | FATTR4_WORD0_MAXWRITE
117 | FATTR4_WORD0_LEASE_TIME,
118 0
119};
120
121static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
122 struct nfs4_readdir_arg *readdir)
123{
124 u32 *start, *p;
125
126 BUG_ON(readdir->count < 80);
127 if (cookie > 2) {
b7ef1956 128 readdir->cookie = cookie;
1da177e4
LT		 129 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
130 return;
131 }
132
133 readdir->cookie = 0;
134 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
135 if (cookie == 2)
136 return;
137
138 /*
139 * NFSv4 servers do not return entries for '.' and '..'
140 * Therefore, we fake these entries here. We let '.'
141 * have cookie 0 and '..' have cookie 1. Note that
142 * when talking to the server, we always send cookie 0
143 * instead of 1 or 2.
144 */
145 start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
146
147 if (cookie == 0) {
148 *p++ = xdr_one; /* next */
149 *p++ = xdr_zero; /* cookie, first word */
150 *p++ = xdr_one; /* cookie, second word */
151 *p++ = xdr_one; /* entry len */
152 memcpy(p, ".\0\0\0", 4); /* entry */
153 p++;
154 *p++ = xdr_one; /* bitmap length */
155 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
156 *p++ = htonl(8); /* attribute buffer length */
157 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
158 }
159
160 *p++ = xdr_one; /* next */
161 *p++ = xdr_zero; /* cookie, first word */
162 *p++ = xdr_two; /* cookie, second word */
163 *p++ = xdr_two; /* entry len */
164 memcpy(p, "..\0\0", 4); /* entry */
165 p++;
166 *p++ = xdr_one; /* bitmap length */
167 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
168 *p++ = htonl(8); /* attribute buffer length */
169 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
170
171 readdir->pgbase = (char *)p - (char *)start;
172 readdir->count -= readdir->pgbase;
173 kunmap_atomic(start, KM_USER0);
174}
175
176static void
177renew_lease(struct nfs_server *server, unsigned long timestamp)
178{
179 struct nfs4_client *clp = server->nfs4_state;
180 spin_lock(&clp->cl_lock);
181 if (time_before(clp->cl_last_renewal,timestamp))
182 clp->cl_last_renewal = timestamp;
183 spin_unlock(&clp->cl_lock);
184}
185
186static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
187{
188 struct nfs_inode *nfsi = NFS_I(inode);
189
decf491f
TM		 190 spin_lock(&inode->i_lock);
191 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1da177e4
LT		 192 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
193 nfsi->change_attr = cinfo->after;
decf491f 194 spin_unlock(&inode->i_lock);
1da177e4
LT		 195}
196
9512135d
TM		 197/* Helper for asynchronous RPC calls */
198static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
199 rpc_action tk_exit, void *calldata)
200{
201 struct rpc_task *task;
202
203 if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
204 return -ENOMEM;
205
206 task->tk_calldata = calldata;
207 task->tk_action = tk_begin;
208 rpc_execute(task);
209 return 0;
210}
211
1da177e4
LT		 212static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
213{
214 struct inode *inode = state->inode;
215
216 open_flags &= (FMODE_READ|FMODE_WRITE);
d530838b 217 /* Protect against nfs4_find_state_byowner() */
ec073428 218 spin_lock(&state->owner->so_lock);
1da177e4 219 spin_lock(&inode->i_lock);
4cecb76f
TM		 220 memcpy(&state->stateid, stateid, sizeof(state->stateid));
221 if ((open_flags & FMODE_WRITE))
222 state->nwriters++;
1da177e4
LT		 223 if (open_flags & FMODE_READ)
224 state->nreaders++;
4cecb76f 225 nfs4_state_set_mode_locked(state, state->state | open_flags);
1da177e4 226 spin_unlock(&inode->i_lock);
ec073428 227 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 228}
229
230/*
231 * OPEN_RECLAIM:
232 * reclaim state on the server after a reboot.
1da177e4
LT		 233 */
234static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
235{
236 struct inode *inode = state->inode;
237 struct nfs_server *server = NFS_SERVER(inode);
238 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
239 struct nfs_openargs o_arg = {
240 .fh = NFS_FH(inode),
1da177e4
LT		 241 .id = sp->so_id,
242 .open_flags = state->state,
243 .clientid = server->nfs4_state->cl_clientid,
244 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
245 .bitmask = server->attr_bitmask,
246 };
247 struct nfs_openres o_res = {
248 .server = server, /* Grrr */
249 };
250 struct rpc_message msg = {
251 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
252 .rpc_argp = &o_arg,
253 .rpc_resp = &o_res,
254 .rpc_cred = sp->so_cred,
255 };
256 int status;
257
258 if (delegation != NULL) {
259 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
260 memcpy(&state->stateid, &delegation->stateid,
261 sizeof(state->stateid));
262 set_bit(NFS_DELEGATED_STATE, &state->flags);
263 return 0;
264 }
265 o_arg.u.delegation_type = delegation->type;
266 }
cee54fc9
TM		 267 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
268 if (o_arg.seqid == NULL)
269 return -ENOMEM;
1da177e4 270 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
cee54fc9
TM		 271 /* Confirm the sequence as being established */
272 nfs_confirm_seqid(&sp->so_seqid, status);
273 nfs_increment_open_seqid(status, o_arg.seqid);
1da177e4
LT		 274 if (status == 0) {
275 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
276 if (o_res.delegation_type != 0) {
277 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
278 /* Did the server issue an immediate delegation recall? */
279 if (o_res.do_recall)
280 nfs_async_inode_return_delegation(inode, &o_res.stateid);
281 }
282 }
cee54fc9 283 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 284 clear_bit(NFS_DELEGATED_STATE, &state->flags);
285 /* Ensure we update the inode attributes */
286 NFS_CACHEINV(inode);
287 return status;
288}
289
290static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
291{
292 struct nfs_server *server = NFS_SERVER(state->inode);
293 struct nfs4_exception exception = { };
294 int err;
295 do {
296 err = _nfs4_open_reclaim(sp, state);
202b50dc
TM		 297 if (err != -NFS4ERR_DELAY)
298 break;
299 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 300 } while (exception.retry);
301 return err;
302}
303
304static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
305{
306 struct nfs4_state_owner *sp = state->owner;
307 struct inode *inode = dentry->d_inode;
308 struct nfs_server *server = NFS_SERVER(inode);
309 struct dentry *parent = dget_parent(dentry);
310 struct nfs_openargs arg = {
311 .fh = NFS_FH(parent->d_inode),
312 .clientid = server->nfs4_state->cl_clientid,
313 .name = &dentry->d_name,
314 .id = sp->so_id,
315 .server = server,
316 .bitmask = server->attr_bitmask,
317 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
318 };
319 struct nfs_openres res = {
320 .server = server,
321 };
322 struct rpc_message msg = {
323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
324 .rpc_argp = &arg,
325 .rpc_resp = &res,
326 .rpc_cred = sp->so_cred,
327 };
328 int status = 0;
329
1da177e4
LT		 330 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
331 goto out;
332 if (state->state == 0)
333 goto out;
cee54fc9
TM		 334 arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
335 status = -ENOMEM;
336 if (arg.seqid == NULL)
337 goto out;
1da177e4
LT		 338 arg.open_flags = state->state;
339 memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
340 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
cee54fc9 341 nfs_increment_open_seqid(status, arg.seqid);
0a8838f9
TM		 342 if (status != 0)
343 goto out_free;
344 if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
345 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
346 sp, &res.stateid, arg.seqid);
347 if (status != 0)
348 goto out_free;
349 }
350 nfs_confirm_seqid(&sp->so_seqid, 0);
1da177e4
LT		 351 if (status >= 0) {
352 memcpy(state->stateid.data, res.stateid.data,
353 sizeof(state->stateid.data));
354 clear_bit(NFS_DELEGATED_STATE, &state->flags);
355 }
0a8838f9 356out_free:
cee54fc9 357 nfs_free_seqid(arg.seqid);
1da177e4 358out:
1da177e4
LT		 359 dput(parent);
360 return status;
361}
362
363int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
364{
365 struct nfs4_exception exception = { };
366 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
367 int err;
368 do {
369 err = _nfs4_open_delegation_recall(dentry, state);
370 switch (err) {
371 case 0:
372 return err;
373 case -NFS4ERR_STALE_CLIENTID:
374 case -NFS4ERR_STALE_STATEID:
375 case -NFS4ERR_EXPIRED:
376 /* Don't recall a delegation if it was lost */
377 nfs4_schedule_state_recovery(server->nfs4_state);
378 return err;
379 }
380 err = nfs4_handle_exception(server, err, &exception);
381 } while (exception.retry);
382 return err;
383}
384
0a8838f9 385static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
1da177e4
LT		 386{
387 struct nfs_open_confirmargs arg = {
388 .fh = fh,
cee54fc9 389 .seqid = seqid,
1da177e4
LT		 390 .stateid = *stateid,
391 };
392 struct nfs_open_confirmres res;
393 struct rpc_message msg = {
394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
395 .rpc_argp = &arg,
396 .rpc_resp = &res,
397 .rpc_cred = sp->so_cred,
398 };
399 int status;
400
401 status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
cee54fc9
TM		 402 /* Confirm the sequence as being established */
403 nfs_confirm_seqid(&sp->so_seqid, status);
404 nfs_increment_open_seqid(status, seqid);
1da177e4
LT		 405 if (status >= 0)
406 memcpy(stateid, &res.stateid, sizeof(*stateid));
407 return status;
408}
409
410static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
411{
412 struct nfs_server *server = NFS_SERVER(dir);
413 struct rpc_message msg = {
414 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
415 .rpc_argp = o_arg,
416 .rpc_resp = o_res,
417 .rpc_cred = sp->so_cred,
418 };
419 int status;
420
421 /* Update sequence id. The caller must serialize! */
1da177e4
LT		 422 o_arg->id = sp->so_id;
423 o_arg->clientid = sp->so_client->cl_clientid;
424
425 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
6f926b5b
TM		 426 if (status == 0) {
427 /* OPEN on anything except a regular file is disallowed in NFSv4 */
428 switch (o_res->f_attr->mode & S_IFMT) {
429 case S_IFREG:
430 break;
431 case S_IFLNK:
432 status = -ELOOP;
433 break;
434 case S_IFDIR:
435 status = -EISDIR;
436 break;
437 default:
438 status = -ENOTDIR;
439 }
440 }
441
cee54fc9 442 nfs_increment_open_seqid(status, o_arg->seqid);
1da177e4
LT		 443 if (status != 0)
444 goto out;
56ae19f3
TM		 445 if (o_arg->open_flags & O_CREAT) {
446 update_changeattr(dir, &o_res->cinfo);
447 nfs_post_op_update_inode(dir, o_res->dir_attr);
448 } else
449 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4
LT		 450 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
451 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
cee54fc9 452 sp, &o_res->stateid, o_arg->seqid);
1da177e4
LT		 453 if (status != 0)
454 goto out;
455 }
cee54fc9 456 nfs_confirm_seqid(&sp->so_seqid, 0);
1da177e4
LT		 457 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
458 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
459out:
460 return status;
461}
462
463static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
464{
465 struct nfs_access_entry cache;
466 int mask = 0;
467 int status;
468
469 if (openflags & FMODE_READ)
470 mask |= MAY_READ;
471 if (openflags & FMODE_WRITE)
472 mask |= MAY_WRITE;
473 status = nfs_access_get_cached(inode, cred, &cache);
474 if (status == 0)
475 goto out;
476
477 /* Be clever: ask server to check for all possible rights */
478 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
479 cache.cred = cred;
480 cache.jiffies = jiffies;
481 status = _nfs4_proc_access(inode, &cache);
482 if (status != 0)
483 return status;
484 nfs_access_add_cache(inode, &cache);
485out:
486 if ((cache.mask & mask) == mask)
487 return 0;
488 return -EACCES;
489}
490
491/*
492 * OPEN_EXPIRED:
493 * reclaim state on the server after a network partition.
494 * Assumes caller holds the appropriate lock
495 */
496static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
497{
498 struct dentry *parent = dget_parent(dentry);
499 struct inode *dir = parent->d_inode;
500 struct inode *inode = state->inode;
501 struct nfs_server *server = NFS_SERVER(dir);
502 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
56ae19f3 503 struct nfs_fattr f_attr, dir_attr;
1da177e4
LT		 504 struct nfs_openargs o_arg = {
505 .fh = NFS_FH(dir),
506 .open_flags = state->state,
507 .name = &dentry->d_name,
508 .bitmask = server->attr_bitmask,
509 .claim = NFS4_OPEN_CLAIM_NULL,
510 };
511 struct nfs_openres o_res = {
512 .f_attr = &f_attr,
56ae19f3 513 .dir_attr = &dir_attr,
1da177e4
LT		 514 .server = server,
515 };
516 int status = 0;
517
518 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
519 status = _nfs4_do_access(inode, sp->so_cred, state->state);
520 if (status < 0)
521 goto out;
522 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
523 set_bit(NFS_DELEGATED_STATE, &state->flags);
524 goto out;
525 }
cee54fc9
TM		 526 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
527 status = -ENOMEM;
528 if (o_arg.seqid == NULL)
529 goto out;
0e574af1 530 nfs_fattr_init(&f_attr);
56ae19f3 531 nfs_fattr_init(&dir_attr);
1da177e4
LT		 532 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
533 if (status != 0)
534 goto out_nodeleg;
535 /* Check if files differ */
536 if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
537 goto out_stale;
538 /* Has the file handle changed? */
539 if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
540 /* Verify if the change attributes are the same */
541 if (f_attr.change_attr != NFS_I(inode)->change_attr)
542 goto out_stale;
543 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
544 goto out_stale;
545 /* Lets just pretend that this is the same file */
546 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
547 NFS_I(inode)->fileid = f_attr.fileid;
548 }
549 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
550 if (o_res.delegation_type != 0) {
551 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
552 nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
553 else
554 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
555 }
556out_nodeleg:
cee54fc9 557 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 558 clear_bit(NFS_DELEGATED_STATE, &state->flags);
559out:
560 dput(parent);
561 return status;
562out_stale:
563 status = -ESTALE;
564 /* Invalidate the state owner so we don't ever use it again */
565 nfs4_drop_state_owner(sp);
566 d_drop(dentry);
567 /* Should we be trying to close that stateid? */
568 goto out_nodeleg;
569}
570
202b50dc
TM		 571static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
572{
573 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
574 struct nfs4_exception exception = { };
575 int err;
576
577 do {
578 err = _nfs4_open_expired(sp, state, dentry);
579 if (err == -NFS4ERR_DELAY)
580 nfs4_handle_exception(server, err, &exception);
581 } while (exception.retry);
582 return err;
583}
584
1da177e4
LT		 585static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
586{
587 struct nfs_inode *nfsi = NFS_I(state->inode);
588 struct nfs_open_context *ctx;
589 int status;
590
591 spin_lock(&state->inode->i_lock);
592 list_for_each_entry(ctx, &nfsi->open_files, list) {
593 if (ctx->state != state)
594 continue;
595 get_nfs_open_context(ctx);
596 spin_unlock(&state->inode->i_lock);
202b50dc 597 status = nfs4_do_open_expired(sp, state, ctx->dentry);
1da177e4
LT		 598 put_nfs_open_context(ctx);
599 return status;
600 }
601 spin_unlock(&state->inode->i_lock);
602 return -ENOENT;
603}
604
605/*
606 * Returns an nfs4_state + an extra reference to the inode
607 */
608static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
609{
610 struct nfs_delegation *delegation;
611 struct nfs_server *server = NFS_SERVER(inode);
612 struct nfs4_client *clp = server->nfs4_state;
613 struct nfs_inode *nfsi = NFS_I(inode);
614 struct nfs4_state_owner *sp = NULL;
615 struct nfs4_state *state = NULL;
616 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
617 int err;
618
619 /* Protect against reboot recovery - NOTE ORDER! */
620 down_read(&clp->cl_sem);
621 /* Protect against delegation recall */
622 down_read(&nfsi->rwsem);
623 delegation = NFS_I(inode)->delegation;
624 err = -ENOENT;
625 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
626 goto out_err;
627 err = -ENOMEM;
628 if (!(sp = nfs4_get_state_owner(server, cred))) {
629 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
630 goto out_err;
631 }
1da177e4
LT		 632 state = nfs4_get_open_state(inode, sp);
633 if (state == NULL)
634 goto out_err;
635
636 err = -ENOENT;
637 if ((state->state & open_flags) == open_flags) {
638 spin_lock(&inode->i_lock);
639 if (open_flags & FMODE_READ)
640 state->nreaders++;
641 if (open_flags & FMODE_WRITE)
642 state->nwriters++;
643 spin_unlock(&inode->i_lock);
644 goto out_ok;
645 } else if (state->state != 0)
646 goto out_err;
647
648 lock_kernel();
649 err = _nfs4_do_access(inode, cred, open_flags);
650 unlock_kernel();
651 if (err != 0)
652 goto out_err;
653 set_bit(NFS_DELEGATED_STATE, &state->flags);
654 update_open_stateid(state, &delegation->stateid, open_flags);
655out_ok:
1da177e4
LT		 656 nfs4_put_state_owner(sp);
657 up_read(&nfsi->rwsem);
658 up_read(&clp->cl_sem);
659 igrab(inode);
660 *res = state;
661 return 0;
662out_err:
663 if (sp != NULL) {
664 if (state != NULL)
665 nfs4_put_open_state(state);
1da177e4
LT		 666 nfs4_put_state_owner(sp);
667 }
668 up_read(&nfsi->rwsem);
669 up_read(&clp->cl_sem);
b8e5c4c2
TM		 670 if (err != -EACCES)
671 nfs_inode_return_delegation(inode);
1da177e4
LT		 672 return err;
673}
674
675static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
676{
677 struct nfs4_exception exception = { };
678 struct nfs4_state *res;
679 int err;
680
681 do {
682 err = _nfs4_open_delegated(inode, flags, cred, &res);
683 if (err == 0)
684 break;
685 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
686 err, &exception));
687 } while (exception.retry);
688 return res;
689}
690
691/*
692 * Returns an nfs4_state + an referenced inode
693 */
694static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
695{
696 struct nfs4_state_owner *sp;
697 struct nfs4_state *state = NULL;
698 struct nfs_server *server = NFS_SERVER(dir);
699 struct nfs4_client *clp = server->nfs4_state;
700 struct inode *inode = NULL;
701 int status;
56ae19f3 702 struct nfs_fattr f_attr, dir_attr;
1da177e4
LT		 703 struct nfs_openargs o_arg = {
704 .fh = NFS_FH(dir),
705 .open_flags = flags,
706 .name = &dentry->d_name,
707 .server = server,
708 .bitmask = server->attr_bitmask,
709 .claim = NFS4_OPEN_CLAIM_NULL,
710 };
711 struct nfs_openres o_res = {
712 .f_attr = &f_attr,
56ae19f3 713 .dir_attr = &dir_attr,
1da177e4
LT		 714 .server = server,
715 };
716
717 /* Protect against reboot recovery conflicts */
718 down_read(&clp->cl_sem);
719 status = -ENOMEM;
720 if (!(sp = nfs4_get_state_owner(server, cred))) {
721 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
722 goto out_err;
723 }
724 if (flags & O_EXCL) {
725 u32 *p = (u32 *) o_arg.u.verifier.data;
726 p[0] = jiffies;
727 p[1] = current->pid;
728 } else
729 o_arg.u.attrs = sattr;
730 /* Serialization for the sequence id */
1da177e4 731
cee54fc9
TM		 732 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
733 if (o_arg.seqid == NULL)
734 return -ENOMEM;
0e574af1 735 nfs_fattr_init(&f_attr);
56ae19f3 736 nfs_fattr_init(&dir_attr);
1da177e4
LT		 737 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
738 if (status != 0)
739 goto out_err;
740
741 status = -ENOMEM;
742 inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
743 if (!inode)
744 goto out_err;
745 state = nfs4_get_open_state(inode, sp);
746 if (!state)
747 goto out_err;
748 update_open_stateid(state, &o_res.stateid, flags);
749 if (o_res.delegation_type != 0)
750 nfs_inode_set_delegation(inode, cred, &o_res);
cee54fc9 751 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 752 nfs4_put_state_owner(sp);
753 up_read(&clp->cl_sem);
754 *res = state;
755 return 0;
756out_err:
757 if (sp != NULL) {
758 if (state != NULL)
759 nfs4_put_open_state(state);
cee54fc9 760 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 761 nfs4_put_state_owner(sp);
762 }
763 /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
764 up_read(&clp->cl_sem);
765 if (inode != NULL)
766 iput(inode);
767 *res = NULL;
768 return status;
769}
770
771
772static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
773{
774 struct nfs4_exception exception = { };
775 struct nfs4_state *res;
776 int status;
777
778 do {
779 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
780 if (status == 0)
781 break;
782 /* NOTE: BAD_SEQID means the server and client disagree about the
783 * book-keeping w.r.t. state-changing operations
784 * (OPEN/CLOSE/LOCK/LOCKU...)
785 * It is actually a sign of a bug on the client or on the server.
786 *
787 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 788 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 789 * have unhashed the old state_owner for us, and that we can
790 * therefore safely retry using a new one. We should still warn
791 * the user though...
792 */
793 if (status == -NFS4ERR_BAD_SEQID) {
794 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
795 exception.retry = 1;
796 continue;
797 }
550f5747
TM		 798 /*
799 * BAD_STATEID on OPEN means that the server cancelled our
800 * state before it received the OPEN_CONFIRM.
801 * Recover by retrying the request as per the discussion
802 * on Page 181 of RFC3530.
803 */
804 if (status == -NFS4ERR_BAD_STATEID) {
805 exception.retry = 1;
806 continue;
807 }
1da177e4
LT		 808 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
809 status, &exception));
810 } while (exception.retry);
811 return res;
812}
813
814static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
815 struct nfs_fh *fhandle, struct iattr *sattr,
816 struct nfs4_state *state)
817{
818 struct nfs_setattrargs arg = {
819 .fh = fhandle,
820 .iap = sattr,
821 .server = server,
822 .bitmask = server->attr_bitmask,
823 };
824 struct nfs_setattrres res = {
825 .fattr = fattr,
826 .server = server,
827 };
828 struct rpc_message msg = {
829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
830 .rpc_argp = &arg,
831 .rpc_resp = &res,
832 };
65e4308d 833 int status;
1da177e4 834
0e574af1 835 nfs_fattr_init(fattr);
1da177e4 836
08e9eac4 837 if (state != NULL) {
1da177e4 838 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 839 nfs4_copy_stateid(&arg.stateid, state, current->files);
840 } else
1da177e4
LT		 841 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
842
65e4308d
TM		 843 status = rpc_call_sync(server->client, &msg, 0);
844 return status;
1da177e4
LT		 845}
846
847static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
848 struct nfs_fh *fhandle, struct iattr *sattr,
849 struct nfs4_state *state)
850{
851 struct nfs4_exception exception = { };
852 int err;
853 do {
854 err = nfs4_handle_exception(server,
855 _nfs4_do_setattr(server, fattr, fhandle, sattr,
856 state),
857 &exception);
858 } while (exception.retry);
859 return err;
860}
861
862struct nfs4_closedata {
863 struct inode *inode;
864 struct nfs4_state *state;
865 struct nfs_closeargs arg;
866 struct nfs_closeres res;
516a6af6 867 struct nfs_fattr fattr;
1da177e4
LT		 868};
869
9512135d
TM		 870static void nfs4_free_closedata(struct nfs4_closedata *calldata)
871{
872 struct nfs4_state *state = calldata->state;
873 struct nfs4_state_owner *sp = state->owner;
9512135d
TM		 874
875 nfs4_put_open_state(calldata->state);
876 nfs_free_seqid(calldata->arg.seqid);
9512135d 877 nfs4_put_state_owner(sp);
9512135d
TM		 878 kfree(calldata);
879}
880
1da177e4
LT		 881static void nfs4_close_done(struct rpc_task *task)
882{
883 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
884 struct nfs4_state *state = calldata->state;
1da177e4
LT		 885 struct nfs_server *server = NFS_SERVER(calldata->inode);
886
887 /* hmm. we are done with the inode, and in the process of freeing
888 * the state_owner. we keep this around to process errors
889 */
cee54fc9 890 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1da177e4
LT		 891 switch (task->tk_status) {
892 case 0:
893 memcpy(&state->stateid, &calldata->res.stateid,
894 sizeof(state->stateid));
895 break;
896 case -NFS4ERR_STALE_STATEID:
897 case -NFS4ERR_EXPIRED:
1da177e4
LT		 898 nfs4_schedule_state_recovery(server->nfs4_state);
899 break;
900 default:
901 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
902 rpc_restart_call(task);
903 return;
904 }
905 }
516a6af6 906 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
9512135d 907 nfs4_free_closedata(calldata);
1da177e4
LT		 908}
909
9512135d 910static void nfs4_close_begin(struct rpc_task *task)
1da177e4 911{
9512135d
TM		 912 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
913 struct nfs4_state *state = calldata->state;
1da177e4
LT		 914 struct rpc_message msg = {
915 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
916 .rpc_argp = &calldata->arg,
917 .rpc_resp = &calldata->res,
9512135d 918 .rpc_cred = state->owner->so_cred,
1da177e4 919 };
4cecb76f 920 int mode = 0, old_mode;
9512135d
TM		 921 int status;
922
923 status = nfs_wait_on_sequence(calldata->arg.seqid, task);
924 if (status != 0)
925 return;
9512135d
TM		 926 /* Recalculate the new open mode in case someone reopened the file
927 * while we were waiting in line to be scheduled.
928 */
4cecb76f
TM		 929 spin_lock(&state->owner->so_lock);
930 spin_lock(&calldata->inode->i_lock);
931 mode = old_mode = state->state;
932 if (state->nreaders == 0)
933 mode &= ~FMODE_READ;
934 if (state->nwriters == 0)
935 mode &= ~FMODE_WRITE;
936 nfs4_state_set_mode_locked(state, mode);
937 spin_unlock(&calldata->inode->i_lock);
938 spin_unlock(&state->owner->so_lock);
939 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
9512135d
TM		 940 nfs4_free_closedata(calldata);
941 task->tk_exit = NULL;
942 rpc_exit(task, 0);
943 return;
944 }
516a6af6 945 nfs_fattr_init(calldata->res.fattr);
9512135d 946 if (mode != 0)
1da177e4 947 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d
TM		 948 calldata->arg.open_flags = mode;
949 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 950}
951
952/*
953 * It is possible for data to be read/written from a mem-mapped file
954 * after the sys_close call (which hits the vfs layer as a flush).
955 * This means that we can't safely call nfsv4 close on a file until
956 * the inode is cleared. This in turn means that we are not good
957 * NFSv4 citizens - we do not indicate to the server to update the file's
958 * share state even when we are done with one of the three share
959 * stateid's in the inode.
960 *
961 * NOTE: Caller must be holding the sp->so_owner semaphore!
962 */
4cecb76f 963int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1da177e4 964{
516a6af6 965 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 966 struct nfs4_closedata *calldata;
9512135d 967 int status = -ENOMEM;
1da177e4 968
9512135d 969 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 970 if (calldata == NULL)
9512135d 971 goto out;
1da177e4
LT		 972 calldata->inode = inode;
973 calldata->state = state;
974 calldata->arg.fh = NFS_FH(inode);
9512135d 975 calldata->arg.stateid = &state->stateid;
1da177e4 976 /* Serialization for the sequence id */
cee54fc9 977 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 978 if (calldata->arg.seqid == NULL)
979 goto out_free_calldata;
516a6af6
TM		 980 calldata->arg.bitmask = server->attr_bitmask;
981 calldata->res.fattr = &calldata->fattr;
982 calldata->res.server = server;
9512135d 983
516a6af6 984 status = nfs4_call_async(server->client, nfs4_close_begin,
9512135d
TM		 985 nfs4_close_done, calldata);
986 if (status == 0)
987 goto out;
988
989 nfs_free_seqid(calldata->arg.seqid);
990out_free_calldata:
991 kfree(calldata);
992out:
993 return status;
1da177e4
LT		 994}
995
02a913a7
TM		 996static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
997{
998 struct file *filp;
999
1000 filp = lookup_instantiate_filp(nd, dentry, NULL);
1001 if (!IS_ERR(filp)) {
1002 struct nfs_open_context *ctx;
1003 ctx = (struct nfs_open_context *)filp->private_data;
1004 ctx->state = state;
1005 } else
1006 nfs4_close_state(state, nd->intent.open.flags);
1007}
1008
1009struct dentry *
1da177e4
LT		 1010nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1011{
1012 struct iattr attr;
1013 struct rpc_cred *cred;
1014 struct nfs4_state *state;
02a913a7 1015 struct dentry *res;
1da177e4
LT		 1016
1017 if (nd->flags & LOOKUP_CREATE) {
1018 attr.ia_mode = nd->intent.open.create_mode;
1019 attr.ia_valid = ATTR_MODE;
1020 if (!IS_POSIXACL(dir))
1021 attr.ia_mode &= ~current->fs->umask;
1022 } else {
1023 attr.ia_valid = 0;
1024 BUG_ON(nd->intent.open.flags & O_CREAT);
1025 }
1026
1027 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1028 if (IS_ERR(cred))
02a913a7 1029 return (struct dentry *)cred;
1da177e4
LT		 1030 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1031 put_rpccred(cred);
02a913a7
TM		 1032 if (IS_ERR(state)) {
1033 if (PTR_ERR(state) == -ENOENT)
1034 d_add(dentry, NULL);
1035 return (struct dentry *)state;
1036 }
1037 res = d_add_unique(dentry, state->inode);
1038 if (res != NULL)
1039 dentry = res;
1040 nfs4_intent_set_file(nd, dentry, state);
1041 return res;
1da177e4
LT		 1042}
1043
1044int
02a913a7 1045nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1046{
1047 struct rpc_cred *cred;
1048 struct nfs4_state *state;
1049 struct inode *inode;
1050
1051 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1052 if (IS_ERR(cred))
1053 return PTR_ERR(cred);
1054 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1055 if (IS_ERR(state))
1056 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1057 put_rpccred(cred);
02a913a7
TM		 1058 if (IS_ERR(state)) {
1059 switch (PTR_ERR(state)) {
1060 case -EPERM:
1061 case -EACCES:
1062 case -EDQUOT:
1063 case -ENOSPC:
1064 case -EROFS:
1065 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1066 return 1;
1067 case -ENOENT:
1068 if (dentry->d_inode == NULL)
1069 return 1;
1070 }
1071 goto out_drop;
1072 }
1da177e4 1073 inode = state->inode;
02a913a7 1074 iput(inode);
1da177e4 1075 if (inode == dentry->d_inode) {
02a913a7 1076 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1077 return 1;
1078 }
1da177e4 1079 nfs4_close_state(state, openflags);
02a913a7
TM		 1080out_drop:
1081 d_drop(dentry);
1da177e4
LT		 1082 return 0;
1083}
1084
1085
1086static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1087{
1088 struct nfs4_server_caps_res res = {};
1089 struct rpc_message msg = {
1090 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1091 .rpc_argp = fhandle,
1092 .rpc_resp = &res,
1093 };
1094 int status;
1095
1096 status = rpc_call_sync(server->client, &msg, 0);
1097 if (status == 0) {
1098 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1099 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1100 server->caps |= NFS_CAP_ACLS;
1101 if (res.has_links != 0)
1102 server->caps |= NFS_CAP_HARDLINKS;
1103 if (res.has_symlinks != 0)
1104 server->caps |= NFS_CAP_SYMLINKS;
1105 server->acl_bitmask = res.acl_bitmask;
1106 }
1107 return status;
1108}
1109
1110static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1111{
1112 struct nfs4_exception exception = { };
1113 int err;
1114 do {
1115 err = nfs4_handle_exception(server,
1116 _nfs4_server_capabilities(server, fhandle),
1117 &exception);
1118 } while (exception.retry);
1119 return err;
1120}
1121
1122static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1123 struct nfs_fsinfo *info)
1124{
1da177e4
LT		 1125 struct nfs4_lookup_root_arg args = {
1126 .bitmask = nfs4_fattr_bitmap,
1127 };
1128 struct nfs4_lookup_res res = {
1129 .server = server,
0e574af1 1130 .fattr = info->fattr,
1da177e4
LT		 1131 .fh = fhandle,
1132 };
1133 struct rpc_message msg = {
1134 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1135 .rpc_argp = &args,
1136 .rpc_resp = &res,
1137 };
0e574af1 1138 nfs_fattr_init(info->fattr);
1da177e4
LT		 1139 return rpc_call_sync(server->client, &msg, 0);
1140}
1141
1142static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1143 struct nfs_fsinfo *info)
1144{
1145 struct nfs4_exception exception = { };
1146 int err;
1147 do {
1148 err = nfs4_handle_exception(server,
1149 _nfs4_lookup_root(server, fhandle, info),
1150 &exception);
1151 } while (exception.retry);
1152 return err;
1153}
1154
1155static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1156 struct nfs_fsinfo *info)
1157{
1158 struct nfs_fattr * fattr = info->fattr;
1159 unsigned char * p;
1160 struct qstr q;
1161 struct nfs4_lookup_arg args = {
1162 .dir_fh = fhandle,
1163 .name = &q,
1164 .bitmask = nfs4_fattr_bitmap,
1165 };
1166 struct nfs4_lookup_res res = {
1167 .server = server,
1168 .fattr = fattr,
1169 .fh = fhandle,
1170 };
1171 struct rpc_message msg = {
1172 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1173 .rpc_argp = &args,
1174 .rpc_resp = &res,
1175 };
1176 int status;
1177
1178 /*
1179 * Now we do a separate LOOKUP for each component of the mount path.
1180 * The LOOKUPs are done separately so that we can conveniently
1181 * catch an ERR_WRONGSEC if it occurs along the way...
1182 */
1183 status = nfs4_lookup_root(server, fhandle, info);
1184 if (status)
1185 goto out;
1186
1187 p = server->mnt_path;
1188 for (;;) {
1189 struct nfs4_exception exception = { };
1190
1191 while (*p == '/')
1192 p++;
1193 if (!*p)
1194 break;
1195 q.name = p;
1196 while (*p && (*p != '/'))
1197 p++;
1198 q.len = p - q.name;
1199
1200 do {
0e574af1 1201 nfs_fattr_init(fattr);
1da177e4
LT		 1202 status = nfs4_handle_exception(server,
1203 rpc_call_sync(server->client, &msg, 0),
1204 &exception);
1205 } while (exception.retry);
1206 if (status == 0)
1207 continue;
1208 if (status == -ENOENT) {
1209 printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1210 printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1211 }
1212 break;
1213 }
1214 if (status == 0)
1215 status = nfs4_server_capabilities(server, fhandle);
1216 if (status == 0)
1217 status = nfs4_do_fsinfo(server, fhandle, info);
1218out:
1219 return status;
1220}
1221
1222static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1223{
1224 struct nfs4_getattr_arg args = {
1225 .fh = fhandle,
1226 .bitmask = server->attr_bitmask,
1227 };
1228 struct nfs4_getattr_res res = {
1229 .fattr = fattr,
1230 .server = server,
1231 };
1232 struct rpc_message msg = {
1233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1234 .rpc_argp = &args,
1235 .rpc_resp = &res,
1236 };
1237
0e574af1 1238 nfs_fattr_init(fattr);
1da177e4
LT		 1239 return rpc_call_sync(server->client, &msg, 0);
1240}
1241
1242static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1243{
1244 struct nfs4_exception exception = { };
1245 int err;
1246 do {
1247 err = nfs4_handle_exception(server,
1248 _nfs4_proc_getattr(server, fhandle, fattr),
1249 &exception);
1250 } while (exception.retry);
1251 return err;
1252}
1253
1254/*
1255 * The file is not closed if it is opened due to the a request to change
1256 * the size of the file. The open call will not be needed once the
1257 * VFS layer lookup-intents are implemented.
1258 *
1259 * Close is called when the inode is destroyed.
1260 * If we haven't opened the file for O_WRONLY, we
1261 * need to in the size_change case to obtain a stateid.
1262 *
1263 * Got race?
1264 * Because OPEN is always done by name in nfsv4, it is
1265 * possible that we opened a different file by the same
1266 * name. We can recognize this race condition, but we
1267 * can't do anything about it besides returning an error.
1268 *
1269 * This will be fixed with VFS changes (lookup-intent).
1270 */
1271static int
1272nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1273 struct iattr *sattr)
1274{
08e9eac4
TM		 1275 struct rpc_cred *cred;
1276 struct inode *inode = dentry->d_inode;
d530838b
TM		 1277 struct nfs_open_context *ctx;
1278 struct nfs4_state *state = NULL;
1da177e4
LT		 1279 int status;
1280
0e574af1 1281 nfs_fattr_init(fattr);
1da177e4 1282
08e9eac4
TM		 1283 cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1284 if (IS_ERR(cred))
1285 return PTR_ERR(cred);
d530838b
TM		 1286
1287 /* Search for an existing open(O_WRITE) file */
1288 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1289 if (ctx != NULL)
1290 state = ctx->state;
08e9eac4 1291
1da177e4
LT		 1292 status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1293 NFS_FH(inode), sattr, state);
65e4308d
TM		 1294 if (status == 0)
1295 nfs_setattr_update_inode(inode, sattr);
d530838b
TM		 1296 if (ctx != NULL)
1297 put_nfs_open_context(ctx);
08e9eac4 1298 put_rpccred(cred);
1da177e4
LT		 1299 return status;
1300}
1301
1302static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1303 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1304{
1305 int status;
1306 struct nfs_server *server = NFS_SERVER(dir);
1307 struct nfs4_lookup_arg args = {
1308 .bitmask = server->attr_bitmask,
1309 .dir_fh = NFS_FH(dir),
1310 .name = name,
1311 };
1312 struct nfs4_lookup_res res = {
1313 .server = server,
1314 .fattr = fattr,
1315 .fh = fhandle,
1316 };
1317 struct rpc_message msg = {
1318 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1319 .rpc_argp = &args,
1320 .rpc_resp = &res,
1321 };
1322
0e574af1 1323 nfs_fattr_init(fattr);
1da177e4
LT		 1324
1325 dprintk("NFS call lookup %s\n", name->name);
1326 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1327 dprintk("NFS reply lookup: %d\n", status);
1328 return status;
1329}
1330
1331static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1332{
1333 struct nfs4_exception exception = { };
1334 int err;
1335 do {
1336 err = nfs4_handle_exception(NFS_SERVER(dir),
1337 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1338 &exception);
1339 } while (exception.retry);
1340 return err;
1341}
1342
1343static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1344{
1345 struct nfs4_accessargs args = {
1346 .fh = NFS_FH(inode),
1347 };
1348 struct nfs4_accessres res = { 0 };
1349 struct rpc_message msg = {
1350 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1351 .rpc_argp = &args,
1352 .rpc_resp = &res,
1353 .rpc_cred = entry->cred,
1354 };
1355 int mode = entry->mask;
1356 int status;
1357
1358 /*
1359 * Determine which access bits we want to ask for...
1360 */
1361 if (mode & MAY_READ)
1362 args.access |= NFS4_ACCESS_READ;
1363 if (S_ISDIR(inode->i_mode)) {
1364 if (mode & MAY_WRITE)
1365 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1366 if (mode & MAY_EXEC)
1367 args.access |= NFS4_ACCESS_LOOKUP;
1368 } else {
1369 if (mode & MAY_WRITE)
1370 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1371 if (mode & MAY_EXEC)
1372 args.access |= NFS4_ACCESS_EXECUTE;
1373 }
1374 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1375 if (!status) {
1376 entry->mask = 0;
1377 if (res.access & NFS4_ACCESS_READ)
1378 entry->mask |= MAY_READ;
1379 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1380 entry->mask |= MAY_WRITE;
1381 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1382 entry->mask |= MAY_EXEC;
1383 }
1384 return status;
1385}
1386
1387static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1388{
1389 struct nfs4_exception exception = { };
1390 int err;
1391 do {
1392 err = nfs4_handle_exception(NFS_SERVER(inode),
1393 _nfs4_proc_access(inode, entry),
1394 &exception);
1395 } while (exception.retry);
1396 return err;
1397}
1398
1399/*
1400 * TODO: For the time being, we don't try to get any attributes
1401 * along with any of the zero-copy operations READ, READDIR,
1402 * READLINK, WRITE.
1403 *
1404 * In the case of the first three, we want to put the GETATTR
1405 * after the read-type operation -- this is because it is hard
1406 * to predict the length of a GETATTR response in v4, and thus
1407 * align the READ data correctly. This means that the GETATTR
1408 * may end up partially falling into the page cache, and we should
1409 * shift it into the 'tail' of the xdr_buf before processing.
1410 * To do this efficiently, we need to know the total length
1411 * of data received, which doesn't seem to be available outside
1412 * of the RPC layer.
1413 *
1414 * In the case of WRITE, we also want to put the GETATTR after
1415 * the operation -- in this case because we want to make sure
1416 * we get the post-operation mtime and size. This means that
1417 * we can't use xdr_encode_pages() as written: we need a variant
1418 * of it which would leave room in the 'tail' iovec.
1419 *
1420 * Both of these changes to the XDR layer would in fact be quite
1421 * minor, but I decided to leave them for a subsequent patch.
1422 */
1423static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1424 unsigned int pgbase, unsigned int pglen)
1425{
1426 struct nfs4_readlink args = {
1427 .fh = NFS_FH(inode),
1428 .pgbase = pgbase,
1429 .pglen = pglen,
1430 .pages = &page,
1431 };
1432 struct rpc_message msg = {
1433 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1434 .rpc_argp = &args,
1435 .rpc_resp = NULL,
1436 };
1437
1438 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1439}
1440
1441static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1442 unsigned int pgbase, unsigned int pglen)
1443{
1444 struct nfs4_exception exception = { };
1445 int err;
1446 do {
1447 err = nfs4_handle_exception(NFS_SERVER(inode),
1448 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1449 &exception);
1450 } while (exception.retry);
1451 return err;
1452}
1453
1454static int _nfs4_proc_read(struct nfs_read_data *rdata)
1455{
1456 int flags = rdata->flags;
1457 struct inode *inode = rdata->inode;
1458 struct nfs_fattr *fattr = rdata->res.fattr;
1459 struct nfs_server *server = NFS_SERVER(inode);
1460 struct rpc_message msg = {
1461 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1462 .rpc_argp = &rdata->args,
1463 .rpc_resp = &rdata->res,
1464 .rpc_cred = rdata->cred,
1465 };
1466 unsigned long timestamp = jiffies;
1467 int status;
1468
1469 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
1470 (long long) rdata->args.offset);
1471
0e574af1 1472 nfs_fattr_init(fattr);
1da177e4
LT		 1473 status = rpc_call_sync(server->client, &msg, flags);
1474 if (!status)
1475 renew_lease(server, timestamp);
1476 dprintk("NFS reply read: %d\n", status);
1477 return status;
1478}
1479
1480static int nfs4_proc_read(struct nfs_read_data *rdata)
1481{
1482 struct nfs4_exception exception = { };
1483 int err;
1484 do {
1485 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1486 _nfs4_proc_read(rdata),
1487 &exception);
1488 } while (exception.retry);
1489 return err;
1490}
1491
1492static int _nfs4_proc_write(struct nfs_write_data *wdata)
1493{
1494 int rpcflags = wdata->flags;
1495 struct inode *inode = wdata->inode;
1496 struct nfs_fattr *fattr = wdata->res.fattr;
1497 struct nfs_server *server = NFS_SERVER(inode);
1498 struct rpc_message msg = {
1499 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1500 .rpc_argp = &wdata->args,
1501 .rpc_resp = &wdata->res,
1502 .rpc_cred = wdata->cred,
1503 };
1504 int status;
1505
1506 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
1507 (long long) wdata->args.offset);
1508
3b6efee9
TM		 1509 wdata->args.bitmask = server->attr_bitmask;
1510 wdata->res.server = server;
0e574af1 1511 nfs_fattr_init(fattr);
1da177e4
LT		 1512 status = rpc_call_sync(server->client, &msg, rpcflags);
1513 dprintk("NFS reply write: %d\n", status);
3b6efee9
TM		 1514 if (status < 0)
1515 return status;
1516 nfs_post_op_update_inode(inode, fattr);
1517 return wdata->res.count;
1da177e4
LT		 1518}
1519
1520static int nfs4_proc_write(struct nfs_write_data *wdata)
1521{
1522 struct nfs4_exception exception = { };
1523 int err;
1524 do {
1525 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1526 _nfs4_proc_write(wdata),
1527 &exception);
1528 } while (exception.retry);
1529 return err;
1530}
1531
1532static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1533{
1534 struct inode *inode = cdata->inode;
1535 struct nfs_fattr *fattr = cdata->res.fattr;
1536 struct nfs_server *server = NFS_SERVER(inode);
1537 struct rpc_message msg = {
1538 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1539 .rpc_argp = &cdata->args,
1540 .rpc_resp = &cdata->res,
1541 .rpc_cred = cdata->cred,
1542 };
1543 int status;
1544
1545 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
1546 (long long) cdata->args.offset);
1547
3b6efee9
TM		 1548 cdata->args.bitmask = server->attr_bitmask;
1549 cdata->res.server = server;
0e574af1 1550 nfs_fattr_init(fattr);
1da177e4
LT		 1551 status = rpc_call_sync(server->client, &msg, 0);
1552 dprintk("NFS reply commit: %d\n", status);
3b6efee9
TM		 1553 if (status >= 0)
1554 nfs_post_op_update_inode(inode, fattr);
1da177e4
LT		 1555 return status;
1556}
1557
1558static int nfs4_proc_commit(struct nfs_write_data *cdata)
1559{
1560 struct nfs4_exception exception = { };
1561 int err;
1562 do {
1563 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1564 _nfs4_proc_commit(cdata),
1565 &exception);
1566 } while (exception.retry);
1567 return err;
1568}
1569
1570/*
1571 * Got race?
1572 * We will need to arrange for the VFS layer to provide an atomic open.
1573 * Until then, this create/open method is prone to inefficiency and race
1574 * conditions due to the lookup, create, and open VFS calls from sys_open()
1575 * placed on the wire.
1576 *
1577 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1578 * The file will be opened again in the subsequent VFS open call
1579 * (nfs4_proc_file_open).
1580 *
1581 * The open for read will just hang around to be used by any process that
1582 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1583 */
1584
1585static int
1586nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1587 int flags, struct nameidata *nd)
1da177e4
LT		 1588{
1589 struct nfs4_state *state;
1590 struct rpc_cred *cred;
1591 int status = 0;
1592
1593 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1594 if (IS_ERR(cred)) {
1595 status = PTR_ERR(cred);
1596 goto out;
1597 }
1598 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1599 put_rpccred(cred);
1600 if (IS_ERR(state)) {
1601 status = PTR_ERR(state);
1602 goto out;
1603 }
1604 d_instantiate(dentry, state->inode);
1605 if (flags & O_EXCL) {
1606 struct nfs_fattr fattr;
1607 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1608 NFS_FH(state->inode), sattr, state);
02a913a7 1609 if (status == 0)
65e4308d 1610 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1611 }
1612 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1613 nfs4_intent_set_file(nd, dentry, state);
1614 else
1615 nfs4_close_state(state, flags);
1da177e4
LT		 1616out:
1617 return status;
1618}
1619
1620static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1621{
16e42959 1622 struct nfs_server *server = NFS_SERVER(dir);
1da177e4
LT		 1623 struct nfs4_remove_arg args = {
1624 .fh = NFS_FH(dir),
1625 .name = name,
16e42959
TM		 1626 .bitmask = server->attr_bitmask,
1627 };
1628 struct nfs_fattr dir_attr;
1629 struct nfs4_remove_res res = {
1630 .server = server,
1631 .dir_attr = &dir_attr,
1da177e4 1632 };
1da177e4
LT		 1633 struct rpc_message msg = {
1634 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1635 .rpc_argp = &args,
1636 .rpc_resp = &res,
1637 };
1638 int status;
1639
16e42959
TM		 1640 nfs_fattr_init(res.dir_attr);
1641 status = rpc_call_sync(server->client, &msg, 0);
1642 if (status == 0) {
1643 update_changeattr(dir, &res.cinfo);
1644 nfs_post_op_update_inode(dir, res.dir_attr);
1645 }
1da177e4
LT		 1646 return status;
1647}
1648
1649static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1650{
1651 struct nfs4_exception exception = { };
1652 int err;
1653 do {
1654 err = nfs4_handle_exception(NFS_SERVER(dir),
1655 _nfs4_proc_remove(dir, name),
1656 &exception);
1657 } while (exception.retry);
1658 return err;
1659}
1660
1661struct unlink_desc {
1662 struct nfs4_remove_arg args;
16e42959
TM		 1663 struct nfs4_remove_res res;
1664 struct nfs_fattr dir_attr;
1da177e4
LT		 1665};
1666
1667static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1668 struct qstr *name)
1669{
16e42959 1670 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1da177e4
LT		 1671 struct unlink_desc *up;
1672
1673 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1674 if (!up)
1675 return -ENOMEM;
1676
1677 up->args.fh = NFS_FH(dir->d_inode);
1678 up->args.name = name;
16e42959
TM		 1679 up->args.bitmask = server->attr_bitmask;
1680 up->res.server = server;
1681 up->res.dir_attr = &up->dir_attr;
1da177e4
LT		 1682
1683 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1684 msg->rpc_argp = &up->args;
1685 msg->rpc_resp = &up->res;
1686 return 0;
1687}
1688
1689static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1690{
1691 struct rpc_message *msg = &task->tk_msg;
1692 struct unlink_desc *up;
1693
1694 if (msg->rpc_resp != NULL) {
1695 up = container_of(msg->rpc_resp, struct unlink_desc, res);
16e42959
TM		 1696 update_changeattr(dir->d_inode, &up->res.cinfo);
1697 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1da177e4
LT		 1698 kfree(up);
1699 msg->rpc_resp = NULL;
1700 msg->rpc_argp = NULL;
1701 }
1702 return 0;
1703}
1704
1705static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1706 struct inode *new_dir, struct qstr *new_name)
1707{
6caf2c82 1708 struct nfs_server *server = NFS_SERVER(old_dir);
1da177e4
LT		 1709 struct nfs4_rename_arg arg = {
1710 .old_dir = NFS_FH(old_dir),
1711 .new_dir = NFS_FH(new_dir),
1712 .old_name = old_name,
1713 .new_name = new_name,
6caf2c82
TM		 1714 .bitmask = server->attr_bitmask,
1715 };
1716 struct nfs_fattr old_fattr, new_fattr;
1717 struct nfs4_rename_res res = {
1718 .server = server,
1719 .old_fattr = &old_fattr,
1720 .new_fattr = &new_fattr,
1da177e4 1721 };
1da177e4
LT		 1722 struct rpc_message msg = {
1723 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1724 .rpc_argp = &arg,
1725 .rpc_resp = &res,
1726 };
1727 int status;
1728
6caf2c82
TM		 1729 nfs_fattr_init(res.old_fattr);
1730 nfs_fattr_init(res.new_fattr);
1731 status = rpc_call_sync(server->client, &msg, 0);
1da177e4
LT		 1732
1733 if (!status) {
1734 update_changeattr(old_dir, &res.old_cinfo);
6caf2c82 1735 nfs_post_op_update_inode(old_dir, res.old_fattr);
1da177e4 1736 update_changeattr(new_dir, &res.new_cinfo);
6caf2c82 1737 nfs_post_op_update_inode(new_dir, res.new_fattr);
1da177e4
LT		 1738 }
1739 return status;
1740}
1741
1742static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1743 struct inode *new_dir, struct qstr *new_name)
1744{
1745 struct nfs4_exception exception = { };
1746 int err;
1747 do {
1748 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1749 _nfs4_proc_rename(old_dir, old_name,
1750 new_dir, new_name),
1751 &exception);
1752 } while (exception.retry);
1753 return err;
1754}
1755
1756static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1757{
91ba2eee 1758 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 1759 struct nfs4_link_arg arg = {
1760 .fh = NFS_FH(inode),
1761 .dir_fh = NFS_FH(dir),
1762 .name = name,
91ba2eee
TM		 1763 .bitmask = server->attr_bitmask,
1764 };
1765 struct nfs_fattr fattr, dir_attr;
1766 struct nfs4_link_res res = {
1767 .server = server,
1768 .fattr = &fattr,
1769 .dir_attr = &dir_attr,
1da177e4 1770 };
1da177e4
LT		 1771 struct rpc_message msg = {
1772 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1773 .rpc_argp = &arg,
91ba2eee 1774 .rpc_resp = &res,
1da177e4
LT		 1775 };
1776 int status;
1777
91ba2eee
TM		 1778 nfs_fattr_init(res.fattr);
1779 nfs_fattr_init(res.dir_attr);
1780 status = rpc_call_sync(server->client, &msg, 0);
1781 if (!status) {
1782 update_changeattr(dir, &res.cinfo);
1783 nfs_post_op_update_inode(dir, res.dir_attr);
1784 nfs_refresh_inode(inode, res.fattr);
1785 }
1da177e4
LT		 1786
1787 return status;
1788}
1789
1790static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1791{
1792 struct nfs4_exception exception = { };
1793 int err;
1794 do {
1795 err = nfs4_handle_exception(NFS_SERVER(inode),
1796 _nfs4_proc_link(inode, dir, name),
1797 &exception);
1798 } while (exception.retry);
1799 return err;
1800}
1801
1802static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1803 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1804 struct nfs_fattr *fattr)
1805{
1806 struct nfs_server *server = NFS_SERVER(dir);
56ae19f3 1807 struct nfs_fattr dir_fattr;
1da177e4
LT		 1808 struct nfs4_create_arg arg = {
1809 .dir_fh = NFS_FH(dir),
1810 .server = server,
1811 .name = name,
1812 .attrs = sattr,
1813 .ftype = NF4LNK,
1814 .bitmask = server->attr_bitmask,
1815 };
1816 struct nfs4_create_res res = {
1817 .server = server,
1818 .fh = fhandle,
1819 .fattr = fattr,
56ae19f3 1820 .dir_fattr = &dir_fattr,
1da177e4
LT		 1821 };
1822 struct rpc_message msg = {
1823 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1824 .rpc_argp = &arg,
1825 .rpc_resp = &res,
1826 };
1827 int status;
1828
1829 if (path->len > NFS4_MAXPATHLEN)
1830 return -ENAMETOOLONG;
1831 arg.u.symlink = path;
0e574af1 1832 nfs_fattr_init(fattr);
56ae19f3 1833 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1834
1835 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1836 if (!status)
1837 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1838 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1839 return status;
1840}
1841
1842static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1843 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1844 struct nfs_fattr *fattr)
1845{
1846 struct nfs4_exception exception = { };
1847 int err;
1848 do {
1849 err = nfs4_handle_exception(NFS_SERVER(dir),
1850 _nfs4_proc_symlink(dir, name, path, sattr,
1851 fhandle, fattr),
1852 &exception);
1853 } while (exception.retry);
1854 return err;
1855}
1856
1857static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1858 struct iattr *sattr)
1859{
1860 struct nfs_server *server = NFS_SERVER(dir);
1861 struct nfs_fh fhandle;
56ae19f3 1862 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1863 struct nfs4_create_arg arg = {
1864 .dir_fh = NFS_FH(dir),
1865 .server = server,
1866 .name = &dentry->d_name,
1867 .attrs = sattr,
1868 .ftype = NF4DIR,
1869 .bitmask = server->attr_bitmask,
1870 };
1871 struct nfs4_create_res res = {
1872 .server = server,
1873 .fh = &fhandle,
1874 .fattr = &fattr,
56ae19f3 1875 .dir_fattr = &dir_fattr,
1da177e4
LT		 1876 };
1877 struct rpc_message msg = {
1878 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1879 .rpc_argp = &arg,
1880 .rpc_resp = &res,
1881 };
1882 int status;
1883
0e574af1 1884 nfs_fattr_init(&fattr);
56ae19f3 1885 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1886
1887 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1888 if (!status) {
1889 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1890 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1891 status = nfs_instantiate(dentry, &fhandle, &fattr);
1892 }
1893 return status;
1894}
1895
1896static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1897 struct iattr *sattr)
1898{
1899 struct nfs4_exception exception = { };
1900 int err;
1901 do {
1902 err = nfs4_handle_exception(NFS_SERVER(dir),
1903 _nfs4_proc_mkdir(dir, dentry, sattr),
1904 &exception);
1905 } while (exception.retry);
1906 return err;
1907}
1908
1909static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1910 u64 cookie, struct page *page, unsigned int count, int plus)
1911{
1912 struct inode *dir = dentry->d_inode;
1913 struct nfs4_readdir_arg args = {
1914 .fh = NFS_FH(dir),
1915 .pages = &page,
1916 .pgbase = 0,
1917 .count = count,
1918 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1919 };
1920 struct nfs4_readdir_res res;
1921 struct rpc_message msg = {
1922 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1923 .rpc_argp = &args,
1924 .rpc_resp = &res,
1925 .rpc_cred = cred,
1926 };
1927 int status;
1928
eadf4598
TM		 1929 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1930 dentry->d_parent->d_name.name,
1931 dentry->d_name.name,
1932 (unsigned long long)cookie);
1da177e4
LT		 1933 lock_kernel();
1934 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1935 res.pgbase = args.pgbase;
1936 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1937 if (status == 0)
1938 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1939 unlock_kernel();
eadf4598 1940 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 1941 return status;
1942}
1943
1944static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1945 u64 cookie, struct page *page, unsigned int count, int plus)
1946{
1947 struct nfs4_exception exception = { };
1948 int err;
1949 do {
1950 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1951 _nfs4_proc_readdir(dentry, cred, cookie,
1952 page, count, plus),
1953 &exception);
1954 } while (exception.retry);
1955 return err;
1956}
1957
1958static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1959 struct iattr *sattr, dev_t rdev)
1960{
1961 struct nfs_server *server = NFS_SERVER(dir);
1962 struct nfs_fh fh;
56ae19f3 1963 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1964 struct nfs4_create_arg arg = {
1965 .dir_fh = NFS_FH(dir),
1966 .server = server,
1967 .name = &dentry->d_name,
1968 .attrs = sattr,
1969 .bitmask = server->attr_bitmask,
1970 };
1971 struct nfs4_create_res res = {
1972 .server = server,
1973 .fh = &fh,
1974 .fattr = &fattr,
56ae19f3 1975 .dir_fattr = &dir_fattr,
1da177e4
LT		 1976 };
1977 struct rpc_message msg = {
1978 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1979 .rpc_argp = &arg,
1980 .rpc_resp = &res,
1981 };
1982 int status;
1983 int mode = sattr->ia_mode;
1984
0e574af1 1985 nfs_fattr_init(&fattr);
56ae19f3 1986 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1987
1988 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1989 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1990 if (S_ISFIFO(mode))
1991 arg.ftype = NF4FIFO;
1992 else if (S_ISBLK(mode)) {
1993 arg.ftype = NF4BLK;
1994 arg.u.device.specdata1 = MAJOR(rdev);
1995 arg.u.device.specdata2 = MINOR(rdev);
1996 }
1997 else if (S_ISCHR(mode)) {
1998 arg.ftype = NF4CHR;
1999 arg.u.device.specdata1 = MAJOR(rdev);
2000 arg.u.device.specdata2 = MINOR(rdev);
2001 }
2002 else
2003 arg.ftype = NF4SOCK;
2004
2005 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2006 if (status == 0) {
2007 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 2008 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 2009 status = nfs_instantiate(dentry, &fh, &fattr);
2010 }
2011 return status;
2012}
2013
2014static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2015 struct iattr *sattr, dev_t rdev)
2016{
2017 struct nfs4_exception exception = { };
2018 int err;
2019 do {
2020 err = nfs4_handle_exception(NFS_SERVER(dir),
2021 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2022 &exception);
2023 } while (exception.retry);
2024 return err;
2025}
2026
2027static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2028 struct nfs_fsstat *fsstat)
2029{
2030 struct nfs4_statfs_arg args = {
2031 .fh = fhandle,
2032 .bitmask = server->attr_bitmask,
2033 };
2034 struct rpc_message msg = {
2035 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2036 .rpc_argp = &args,
2037 .rpc_resp = fsstat,
2038 };
2039
0e574af1 2040 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 2041 return rpc_call_sync(server->client, &msg, 0);
2042}
2043
2044static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2045{
2046 struct nfs4_exception exception = { };
2047 int err;
2048 do {
2049 err = nfs4_handle_exception(server,
2050 _nfs4_proc_statfs(server, fhandle, fsstat),
2051 &exception);
2052 } while (exception.retry);
2053 return err;
2054}
2055
2056static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2057 struct nfs_fsinfo *fsinfo)
2058{
2059 struct nfs4_fsinfo_arg args = {
2060 .fh = fhandle,
2061 .bitmask = server->attr_bitmask,
2062 };
2063 struct rpc_message msg = {
2064 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2065 .rpc_argp = &args,
2066 .rpc_resp = fsinfo,
2067 };
2068
2069 return rpc_call_sync(server->client, &msg, 0);
2070}
2071
2072static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2073{
2074 struct nfs4_exception exception = { };
2075 int err;
2076
2077 do {
2078 err = nfs4_handle_exception(server,
2079 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2080 &exception);
2081 } while (exception.retry);
2082 return err;
2083}
2084
2085static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2086{
0e574af1 2087 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2088 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2089}
2090
2091static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2092 struct nfs_pathconf *pathconf)
2093{
2094 struct nfs4_pathconf_arg args = {
2095 .fh = fhandle,
2096 .bitmask = server->attr_bitmask,
2097 };
2098 struct rpc_message msg = {
2099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2100 .rpc_argp = &args,
2101 .rpc_resp = pathconf,
2102 };
2103
2104 /* None of the pathconf attributes are mandatory to implement */
2105 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2106 memset(pathconf, 0, sizeof(*pathconf));
2107 return 0;
2108 }
2109
0e574af1 2110 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2111 return rpc_call_sync(server->client, &msg, 0);
2112}
2113
2114static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2115 struct nfs_pathconf *pathconf)
2116{
2117 struct nfs4_exception exception = { };
2118 int err;
2119
2120 do {
2121 err = nfs4_handle_exception(server,
2122 _nfs4_proc_pathconf(server, fhandle, pathconf),
2123 &exception);
2124 } while (exception.retry);
2125 return err;
2126}
2127
2128static void
2129nfs4_read_done(struct rpc_task *task)
2130{
2131 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2132 struct inode *inode = data->inode;
2133
2134 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2135 rpc_restart_call(task);
2136 return;
2137 }
2138 if (task->tk_status > 0)
2139 renew_lease(NFS_SERVER(inode), data->timestamp);
2140 /* Call back common NFS readpage processing */
2141 nfs_readpage_result(task);
2142}
2143
2144static void
2145nfs4_proc_read_setup(struct nfs_read_data *data)
2146{
2147 struct rpc_task *task = &data->task;
2148 struct rpc_message msg = {
2149 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2150 .rpc_argp = &data->args,
2151 .rpc_resp = &data->res,
2152 .rpc_cred = data->cred,
2153 };
2154 struct inode *inode = data->inode;
2155 int flags;
2156
2157 data->timestamp = jiffies;
2158
2159 /* N.B. Do we need to test? Never called for swapfile inode */
2160 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2161
2162 /* Finalize the task. */
2163 rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2164 rpc_call_setup(task, &msg, 0);
2165}
2166
2167static void
2168nfs4_write_done(struct rpc_task *task)
2169{
2170 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2171 struct inode *inode = data->inode;
2172
2173 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2174 rpc_restart_call(task);
2175 return;
2176 }
4f9838c7 2177 if (task->tk_status >= 0) {
1da177e4 2178 renew_lease(NFS_SERVER(inode), data->timestamp);
4f9838c7
TM		 2179 nfs_post_op_update_inode(inode, data->res.fattr);
2180 }
1da177e4
LT		 2181 /* Call back common NFS writeback processing */
2182 nfs_writeback_done(task);
2183}
2184
2185static void
2186nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2187{
2188 struct rpc_task *task = &data->task;
2189 struct rpc_message msg = {
2190 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2191 .rpc_argp = &data->args,
2192 .rpc_resp = &data->res,
2193 .rpc_cred = data->cred,
2194 };
2195 struct inode *inode = data->inode;
4f9838c7 2196 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2197 int stable;
2198 int flags;
2199
2200 if (how & FLUSH_STABLE) {
2201 if (!NFS_I(inode)->ncommit)
2202 stable = NFS_FILE_SYNC;
2203 else
2204 stable = NFS_DATA_SYNC;
2205 } else
2206 stable = NFS_UNSTABLE;
2207 data->args.stable = stable;
4f9838c7
TM		 2208 data->args.bitmask = server->attr_bitmask;
2209 data->res.server = server;
1da177e4
LT		 2210
2211 data->timestamp = jiffies;
2212
2213 /* Set the initial flags for the task. */
2214 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2215
2216 /* Finalize the task. */
2217 rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2218 rpc_call_setup(task, &msg, 0);
2219}
2220
2221static void
2222nfs4_commit_done(struct rpc_task *task)
2223{
2224 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2225 struct inode *inode = data->inode;
2226
2227 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2228 rpc_restart_call(task);
2229 return;
2230 }
4f9838c7
TM		 2231 if (task->tk_status >= 0)
2232 nfs_post_op_update_inode(inode, data->res.fattr);
1da177e4
LT		 2233 /* Call back common NFS writeback processing */
2234 nfs_commit_done(task);
2235}
2236
2237static void
2238nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2239{
2240 struct rpc_task *task = &data->task;
2241 struct rpc_message msg = {
2242 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2243 .rpc_argp = &data->args,
2244 .rpc_resp = &data->res,
2245 .rpc_cred = data->cred,
2246 };
2247 struct inode *inode = data->inode;
4f9838c7 2248 struct nfs_server *server = NFS_SERVER(inode);
1da177e4
LT		 2249 int flags;
2250
4f9838c7
TM		 2251 data->args.bitmask = server->attr_bitmask;
2252 data->res.server = server;
2253
1da177e4
LT		 2254 /* Set the initial flags for the task. */
2255 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2256
2257 /* Finalize the task. */
2258 rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2259 rpc_call_setup(task, &msg, 0);
2260}
2261
2262/*
2263 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2264 * standalone procedure for queueing an asynchronous RENEW.
2265 */
2266static void
2267renew_done(struct rpc_task *task)
2268{
2269 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2270 unsigned long timestamp = (unsigned long)task->tk_calldata;
2271
2272 if (task->tk_status < 0) {
2273 switch (task->tk_status) {
2274 case -NFS4ERR_STALE_CLIENTID:
2275 case -NFS4ERR_EXPIRED:
2276 case -NFS4ERR_CB_PATH_DOWN:
2277 nfs4_schedule_state_recovery(clp);
2278 }
2279 return;
2280 }
2281 spin_lock(&clp->cl_lock);
2282 if (time_before(clp->cl_last_renewal,timestamp))
2283 clp->cl_last_renewal = timestamp;
2284 spin_unlock(&clp->cl_lock);
2285}
2286
2287int
2288nfs4_proc_async_renew(struct nfs4_client *clp)
2289{
2290 struct rpc_message msg = {
2291 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2292 .rpc_argp = clp,
2293 .rpc_cred = clp->cl_cred,
2294 };
2295
2296 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2297 renew_done, (void *)jiffies);
2298}
2299
2300int
2301nfs4_proc_renew(struct nfs4_client *clp)
2302{
2303 struct rpc_message msg = {
2304 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2305 .rpc_argp = clp,
2306 .rpc_cred = clp->cl_cred,
2307 };
2308 unsigned long now = jiffies;
2309 int status;
2310
2311 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2312 if (status < 0)
2313 return status;
2314 spin_lock(&clp->cl_lock);
2315 if (time_before(clp->cl_last_renewal,now))
2316 clp->cl_last_renewal = now;
2317 spin_unlock(&clp->cl_lock);
2318 return 0;
2319}
2320
aa1870af
BF		 2321static inline int nfs4_server_supports_acls(struct nfs_server *server)
2322{
2323 return (server->caps & NFS_CAP_ACLS)
2324 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2325 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2326}
2327
2328/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2329 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2330 * the stack.
2331 */
2332#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2333
2334static void buf_to_pages(const void *buf, size_t buflen,
2335 struct page **pages, unsigned int *pgbase)
2336{
2337 const void *p = buf;
2338
2339 *pgbase = offset_in_page(buf);
2340 p -= *pgbase;
2341 while (p < buf + buflen) {
2342 *(pages++) = virt_to_page(p);
2343 p += PAGE_CACHE_SIZE;
2344 }
2345}
2346
e50a1c2e
BF		 2347struct nfs4_cached_acl {
2348 int cached;
2349 size_t len;
3e9d4154 2350 char data[0];
e50a1c2e
BF		 2351};
2352
2353static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2354{
2355 struct nfs_inode *nfsi = NFS_I(inode);
2356
2357 spin_lock(&inode->i_lock);
2358 kfree(nfsi->nfs4_acl);
2359 nfsi->nfs4_acl = acl;
2360 spin_unlock(&inode->i_lock);
2361}
2362
2363static void nfs4_zap_acl_attr(struct inode *inode)
2364{
2365 nfs4_set_cached_acl(inode, NULL);
2366}
2367
2368static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2369{
2370 struct nfs_inode *nfsi = NFS_I(inode);
2371 struct nfs4_cached_acl *acl;
2372 int ret = -ENOENT;
2373
2374 spin_lock(&inode->i_lock);
2375 acl = nfsi->nfs4_acl;
2376 if (acl == NULL)
2377 goto out;
2378 if (buf == NULL) /* user is just asking for length */
2379 goto out_len;
2380 if (acl->cached == 0)
2381 goto out;
2382 ret = -ERANGE; /* see getxattr(2) man page */
2383 if (acl->len > buflen)
2384 goto out;
2385 memcpy(buf, acl->data, acl->len);
2386out_len:
2387 ret = acl->len;
2388out:
2389 spin_unlock(&inode->i_lock);
2390 return ret;
2391}
2392
2393static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2394{
2395 struct nfs4_cached_acl *acl;
2396
2397 if (buf && acl_len <= PAGE_SIZE) {
2398 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2399 if (acl == NULL)
2400 goto out;
2401 acl->cached = 1;
2402 memcpy(acl->data, buf, acl_len);
2403 } else {
2404 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2405 if (acl == NULL)
2406 goto out;
2407 acl->cached = 0;
2408 }
2409 acl->len = acl_len;
2410out:
2411 nfs4_set_cached_acl(inode, acl);
2412}
2413
2414static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2415{
aa1870af
BF		 2416 struct page *pages[NFS4ACL_MAXPAGES];
2417 struct nfs_getaclargs args = {
2418 .fh = NFS_FH(inode),
2419 .acl_pages = pages,
2420 .acl_len = buflen,
2421 };
2422 size_t resp_len = buflen;
e50a1c2e 2423 void *resp_buf;
aa1870af
BF		 2424 struct rpc_message msg = {
2425 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2426 .rpc_argp = &args,
2427 .rpc_resp = &resp_len,
2428 };
e50a1c2e 2429 struct page *localpage = NULL;
aa1870af
BF		 2430 int ret;
2431
e50a1c2e
BF		 2432 if (buflen < PAGE_SIZE) {
2433 /* As long as we're doing a round trip to the server anyway,
2434 * let's be prepared for a page of acl data. */
2435 localpage = alloc_page(GFP_KERNEL);
2436 resp_buf = page_address(localpage);
2437 if (localpage == NULL)
2438 return -ENOMEM;
2439 args.acl_pages[0] = localpage;
2440 args.acl_pgbase = 0;
1d95db8e 2441 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2442 } else {
2443 resp_buf = buf;
2444 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2445 }
aa1870af 2446 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2447 if (ret)
2448 goto out_free;
2449 if (resp_len > args.acl_len)
2450 nfs4_write_cached_acl(inode, NULL, resp_len);
2451 else
2452 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2453 if (buf) {
2454 ret = -ERANGE;
2455 if (resp_len > buflen)
2456 goto out_free;
2457 if (localpage)
2458 memcpy(buf, resp_buf, resp_len);
2459 }
2460 ret = resp_len;
2461out_free:
2462 if (localpage)
2463 __free_page(localpage);
aa1870af
BF		 2464 return ret;
2465}
2466
e50a1c2e
BF		 2467static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2468{
2469 struct nfs_server *server = NFS_SERVER(inode);
2470 int ret;
2471
2472 if (!nfs4_server_supports_acls(server))
2473 return -EOPNOTSUPP;
2474 ret = nfs_revalidate_inode(server, inode);
2475 if (ret < 0)
2476 return ret;
2477 ret = nfs4_read_cached_acl(inode, buf, buflen);
2478 if (ret != -ENOENT)
2479 return ret;
2480 return nfs4_get_acl_uncached(inode, buf, buflen);
2481}
2482
4b580ee3
BF		 2483static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2484{
2485 struct nfs_server *server = NFS_SERVER(inode);
2486 struct page *pages[NFS4ACL_MAXPAGES];
2487 struct nfs_setaclargs arg = {
2488 .fh = NFS_FH(inode),
2489 .acl_pages = pages,
2490 .acl_len = buflen,
2491 };
2492 struct rpc_message msg = {
2493 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2494 .rpc_argp = &arg,
2495 .rpc_resp = NULL,
2496 };
2497 int ret;
2498
2499 if (!nfs4_server_supports_acls(server))
2500 return -EOPNOTSUPP;
642ac549 2501 nfs_inode_return_delegation(inode);
4b580ee3
BF		 2502 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2503 ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
e50a1c2e
BF		 2504 if (ret == 0)
2505 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2506 return ret;
2507}
2508
1da177e4 2509static int
faf5f49c 2510nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4
LT		 2511{
2512 struct nfs4_client *clp = server->nfs4_state;
2513
2514 if (!clp || task->tk_status >= 0)
2515 return 0;
2516 switch(task->tk_status) {
2517 case -NFS4ERR_STALE_CLIENTID:
2518 case -NFS4ERR_STALE_STATEID:
2519 case -NFS4ERR_EXPIRED:
2520 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2521 nfs4_schedule_state_recovery(clp);
2522 if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2523 rpc_wake_up_task(task);
2524 task->tk_status = 0;
2525 return -EAGAIN;
2526 case -NFS4ERR_GRACE:
2527 case -NFS4ERR_DELAY:
2528 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2529 task->tk_status = 0;
2530 return -EAGAIN;
2531 case -NFS4ERR_OLD_STATEID:
2532 task->tk_status = 0;
2533 return -EAGAIN;
2534 }
2535 task->tk_status = nfs4_map_errors(task->tk_status);
2536 return 0;
2537}
2538
2539static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2540{
2541 DEFINE_WAIT(wait);
2542 sigset_t oldset;
2543 int interruptible, res = 0;
2544
2545 might_sleep();
2546
2547 rpc_clnt_sigmask(clnt, &oldset);
2548 interruptible = TASK_UNINTERRUPTIBLE;
2549 if (clnt->cl_intr)
2550 interruptible = TASK_INTERRUPTIBLE;
2551 prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2552 nfs4_schedule_state_recovery(clp);
2553 if (clnt->cl_intr && signalled())
2554 res = -ERESTARTSYS;
2555 else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2556 schedule();
2557 finish_wait(&clp->cl_waitq, &wait);
2558 rpc_clnt_sigunmask(clnt, &oldset);
2559 return res;
2560}
2561
2562static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2563{
2564 sigset_t oldset;
2565 int res = 0;
2566
2567 might_sleep();
2568
2569 if (*timeout <= 0)
2570 *timeout = NFS4_POLL_RETRY_MIN;
2571 if (*timeout > NFS4_POLL_RETRY_MAX)
2572 *timeout = NFS4_POLL_RETRY_MAX;
2573 rpc_clnt_sigmask(clnt, &oldset);
2574 if (clnt->cl_intr) {
041e0e3b 2575 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2576 if (signalled())
2577 res = -ERESTARTSYS;
041e0e3b
NA		 2578 } else
2579 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2580 rpc_clnt_sigunmask(clnt, &oldset);
2581 *timeout <<= 1;
2582 return res;
2583}
2584
2585/* This is the error handling routine for processes that are allowed
2586 * to sleep.
2587 */
faf5f49c 2588int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4
LT		 2589{
2590 struct nfs4_client *clp = server->nfs4_state;
2591 int ret = errorcode;
2592
2593 exception->retry = 0;
2594 switch(errorcode) {
2595 case 0:
2596 return 0;
2597 case -NFS4ERR_STALE_CLIENTID:
2598 case -NFS4ERR_STALE_STATEID:
2599 case -NFS4ERR_EXPIRED:
2600 ret = nfs4_wait_clnt_recover(server->client, clp);
2601 if (ret == 0)
2602 exception->retry = 1;
2603 break;
2604 case -NFS4ERR_GRACE:
2605 case -NFS4ERR_DELAY:
2606 ret = nfs4_delay(server->client, &exception->timeout);
2c56617d
TM		 2607 if (ret != 0)
2608 break;
1da177e4 2609 case -NFS4ERR_OLD_STATEID:
2c56617d 2610 exception->retry = 1;
1da177e4
LT		 2611 }
2612 /* We failed to handle the error */
2613 return nfs4_map_errors(ret);
2614}
2615
2616int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2617{
2618 nfs4_verifier sc_verifier;
2619 struct nfs4_setclientid setclientid = {
2620 .sc_verifier = &sc_verifier,
2621 .sc_prog = program,
2622 };
2623 struct rpc_message msg = {
2624 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2625 .rpc_argp = &setclientid,
2626 .rpc_resp = clp,
2627 .rpc_cred = clp->cl_cred,
2628 };
2629 u32 *p;
2630 int loop = 0;
2631 int status;
2632
2633 p = (u32*)sc_verifier.data;
2634 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2635 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2636
2637 for(;;) {
2638 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2639 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2640 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2641 clp->cl_cred->cr_ops->cr_name,
2642 clp->cl_id_uniquifier);
2643 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2644 sizeof(setclientid.sc_netid), "tcp");
2645 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2646 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2647 clp->cl_ipaddr, port >> 8, port & 255);
2648
2649 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2650 if (status != -NFS4ERR_CLID_INUSE)
2651 break;
2652 if (signalled())
2653 break;
2654 if (loop++ & 1)
2655 ssleep(clp->cl_lease_time + 1);
2656 else
2657 if (++clp->cl_id_uniquifier == 0)
2658 break;
2659 }
2660 return status;
2661}
2662
2663int
2664nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2665{
2666 struct nfs_fsinfo fsinfo;
2667 struct rpc_message msg = {
2668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2669 .rpc_argp = clp,
2670 .rpc_resp = &fsinfo,
2671 .rpc_cred = clp->cl_cred,
2672 };
2673 unsigned long now;
2674 int status;
2675
2676 now = jiffies;
2677 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2678 if (status == 0) {
2679 spin_lock(&clp->cl_lock);
2680 clp->cl_lease_time = fsinfo.lease_time * HZ;
2681 clp->cl_last_renewal = now;
2682 spin_unlock(&clp->cl_lock);
2683 }
2684 return status;
2685}
2686
2687static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2688{
2689 struct nfs4_delegreturnargs args = {
2690 .fhandle = NFS_FH(inode),
2691 .stateid = stateid,
2692 };
2693 struct rpc_message msg = {
2694 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2695 .rpc_argp = &args,
2696 .rpc_cred = cred,
2697 };
2698
2699 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2700}
2701
2702int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2703{
2704 struct nfs_server *server = NFS_SERVER(inode);
2705 struct nfs4_exception exception = { };
2706 int err;
2707 do {
2708 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2709 switch (err) {
2710 case -NFS4ERR_STALE_STATEID:
2711 case -NFS4ERR_EXPIRED:
2712 nfs4_schedule_state_recovery(server->nfs4_state);
2713 case 0:
2714 return 0;
2715 }
2716 err = nfs4_handle_exception(server, err, &exception);
2717 } while (exception.retry);
2718 return err;
2719}
2720
2721#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2722#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2723
2724/*
2725 * sleep, with exponential backoff, and retry the LOCK operation.
2726 */
2727static unsigned long
2728nfs4_set_lock_task_retry(unsigned long timeout)
2729{
041e0e3b 2730 schedule_timeout_interruptible(timeout);
1da177e4
LT		 2731 timeout <<= 1;
2732 if (timeout > NFS4_LOCK_MAXTIMEOUT)
2733 return NFS4_LOCK_MAXTIMEOUT;
2734 return timeout;
2735}
2736
2737static inline int
2738nfs4_lck_type(int cmd, struct file_lock *request)
2739{
2740 /* set lock type */
2741 switch (request->fl_type) {
2742 case F_RDLCK:
2743 return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2744 case F_WRLCK:
2745 return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2746 case F_UNLCK:
2747 return NFS4_WRITE_LT;
2748 }
2749 BUG();
2750 return 0;
2751}
2752
2753static inline uint64_t
2754nfs4_lck_length(struct file_lock *request)
2755{
2756 if (request->fl_end == OFFSET_MAX)
2757 return ~(uint64_t)0;
2758 return request->fl_end - request->fl_start + 1;
2759}
2760
2761static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2762{
2763 struct inode *inode = state->inode;
2764 struct nfs_server *server = NFS_SERVER(inode);
2765 struct nfs4_client *clp = server->nfs4_state;
2766 struct nfs_lockargs arg = {
2767 .fh = NFS_FH(inode),
2768 .type = nfs4_lck_type(cmd, request),
2769 .offset = request->fl_start,
2770 .length = nfs4_lck_length(request),
2771 };
2772 struct nfs_lockres res = {
2773 .server = server,
2774 };
2775 struct rpc_message msg = {
2776 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2777 .rpc_argp = &arg,
2778 .rpc_resp = &res,
2779 .rpc_cred = state->owner->so_cred,
2780 };
2781 struct nfs_lowner nlo;
2782 struct nfs4_lock_state *lsp;
2783 int status;
2784
2785 down_read(&clp->cl_sem);
2786 nlo.clientid = clp->cl_clientid;
8d0a8a9d
TM		 2787 status = nfs4_set_lock_state(state, request);
2788 if (status != 0)
2789 goto out;
2790 lsp = request->fl_u.nfs4_fl.owner;
2791 nlo.id = lsp->ls_id;
1da177e4
LT		 2792 arg.u.lockt = &nlo;
2793 status = rpc_call_sync(server->client, &msg, 0);
2794 if (!status) {
2795 request->fl_type = F_UNLCK;
2796 } else if (status == -NFS4ERR_DENIED) {
2797 int64_t len, start, end;
2798 start = res.u.denied.offset;
2799 len = res.u.denied.length;
2800 end = start + len - 1;
2801 if (end < 0 || len == 0)
2802 request->fl_end = OFFSET_MAX;
2803 else
2804 request->fl_end = (loff_t)end;
2805 request->fl_start = (loff_t)start;
2806 request->fl_type = F_WRLCK;
2807 if (res.u.denied.type & 1)
2808 request->fl_type = F_RDLCK;
2809 request->fl_pid = 0;
2810 status = 0;
2811 }
8d0a8a9d 2812out:
1da177e4
LT		 2813 up_read(&clp->cl_sem);
2814 return status;
2815}
2816
2817static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2818{
2819 struct nfs4_exception exception = { };
2820 int err;
2821
2822 do {
2823 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2824 _nfs4_proc_getlk(state, cmd, request),
2825 &exception);
2826 } while (exception.retry);
2827 return err;
2828}
2829
2830static int do_vfs_lock(struct file *file, struct file_lock *fl)
2831{
2832 int res = 0;
2833 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2834 case FL_POSIX:
2835 res = posix_lock_file_wait(file, fl);
2836 break;
2837 case FL_FLOCK:
2838 res = flock_lock_file_wait(file, fl);
2839 break;
2840 default:
2841 BUG();
2842 }
2843 if (res < 0)
2844 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2845 __FUNCTION__);
2846 return res;
2847}
2848
faf5f49c
TM		 2849struct nfs4_unlockdata {
2850 struct nfs_lockargs arg;
2851 struct nfs_locku_opargs luargs;
2852 struct nfs_lockres res;
2853 struct nfs4_lock_state *lsp;
2854 struct nfs_open_context *ctx;
2855 atomic_t refcount;
2856 struct completion completion;
2857};
2858
2859static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
1da177e4 2860{
faf5f49c
TM		 2861 if (atomic_dec_and_test(&calldata->refcount)) {
2862 nfs_free_seqid(calldata->luargs.seqid);
2863 nfs4_put_lock_state(calldata->lsp);
2864 put_nfs_open_context(calldata->ctx);
2865 kfree(calldata);
2866 }
2867}
2868
2869static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2870{
2871 complete(&calldata->completion);
2872 nfs4_locku_release_calldata(calldata);
2873}
2874
2875static void nfs4_locku_done(struct rpc_task *task)
2876{
2877 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2878
2879 nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2880 switch (task->tk_status) {
2881 case 0:
2882 memcpy(calldata->lsp->ls_stateid.data,
2883 calldata->res.u.stateid.data,
2884 sizeof(calldata->lsp->ls_stateid.data));
2885 break;
2886 case -NFS4ERR_STALE_STATEID:
2887 case -NFS4ERR_EXPIRED:
2888 nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2889 break;
2890 default:
2891 if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2892 rpc_restart_call(task);
2893 return;
2894 }
2895 }
2896 nfs4_locku_complete(calldata);
2897}
2898
2899static void nfs4_locku_begin(struct rpc_task *task)
2900{
2901 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
1da177e4
LT		 2902 struct rpc_message msg = {
2903 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 2904 .rpc_argp = &calldata->arg,
2905 .rpc_resp = &calldata->res,
2906 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 2907 };
faf5f49c
TM		 2908 int status;
2909
2910 status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2911 if (status != 0)
2912 return;
2913 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2914 nfs4_locku_complete(calldata);
2915 task->tk_exit = NULL;
2916 rpc_exit(task, 0);
2917 return;
2918 }
2919 rpc_call_setup(task, &msg, 0);
2920}
2921
2922static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2923{
2924 struct nfs4_unlockdata *calldata;
2925 struct inode *inode = state->inode;
2926 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2927 struct nfs4_lock_state *lsp;
8d0a8a9d 2928 int status;
faf5f49c 2929
6bfc93ef
TM		 2930 /* Is this a delegated lock? */
2931 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
2932 return do_vfs_lock(request->fl_file, request);
2933
8d0a8a9d
TM		 2934 status = nfs4_set_lock_state(state, request);
2935 if (status != 0)
faf5f49c 2936 return status;
8d0a8a9d 2937 lsp = request->fl_u.nfs4_fl.owner;
1da177e4 2938 /* We might have lost the locks! */
8d0a8a9d 2939 if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
faf5f49c
TM		 2940 return 0;
2941 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2942 if (calldata == NULL)
2943 return -ENOMEM;
2944 calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2945 if (calldata->luargs.seqid == NULL) {
2946 kfree(calldata);
2947 return -ENOMEM;
2948 }
2949 calldata->luargs.stateid = &lsp->ls_stateid;
2950 calldata->arg.fh = NFS_FH(inode);
2951 calldata->arg.type = nfs4_lck_type(cmd, request);
2952 calldata->arg.offset = request->fl_start;
2953 calldata->arg.length = nfs4_lck_length(request);
2954 calldata->arg.u.locku = &calldata->luargs;
2955 calldata->res.server = server;
2956 calldata->lsp = lsp;
2957 atomic_inc(&lsp->ls_count);
2958
2959 /* Ensure we don't close file until we're done freeing locks! */
2960 calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2961
2962 atomic_set(&calldata->refcount, 2);
2963 init_completion(&calldata->completion);
2964
2965 status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2966 nfs4_locku_done, calldata);
1da177e4 2967 if (status == 0)
faf5f49c
TM		 2968 wait_for_completion_interruptible(&calldata->completion);
2969 do_vfs_lock(request->fl_file, request);
2970 nfs4_locku_release_calldata(calldata);
1da177e4
LT		 2971 return status;
2972}
2973
1da177e4
LT		 2974static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2975{
2976 struct inode *inode = state->inode;
2977 struct nfs_server *server = NFS_SERVER(inode);
8d0a8a9d 2978 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
06735b34
TM		 2979 struct nfs_lock_opargs largs = {
2980 .lock_stateid = &lsp->ls_stateid,
2981 .open_stateid = &state->stateid,
2982 .lock_owner = {
2983 .clientid = server->nfs4_state->cl_clientid,
2984 .id = lsp->ls_id,
2985 },
2986 .reclaim = reclaim,
2987 };
1da177e4
LT		 2988 struct nfs_lockargs arg = {
2989 .fh = NFS_FH(inode),
2990 .type = nfs4_lck_type(cmd, request),
2991 .offset = request->fl_start,
2992 .length = nfs4_lck_length(request),
06735b34
TM		 2993 .u = {
2994 .lock = &largs,
2995 },
1da177e4
LT		 2996 };
2997 struct nfs_lockres res = {
2998 .server = server,
2999 };
3000 struct rpc_message msg = {
3001 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3002 .rpc_argp = &arg,
3003 .rpc_resp = &res,
3004 .rpc_cred = state->owner->so_cred,
3005 };
cee54fc9 3006 int status = -ENOMEM;
1da177e4 3007
06735b34
TM		 3008 largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3009 if (largs.lock_seqid == NULL)
cee54fc9
TM		 3010 return -ENOMEM;
3011 if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
1da177e4 3012 struct nfs4_state_owner *owner = state->owner;
06735b34
TM		 3013
3014 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3015 if (largs.open_seqid == NULL)
3016 goto out;
1da177e4 3017 largs.new_lock_owner = 1;
06735b34
TM		 3018 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3019 /* increment open seqid on success, and seqid mutating errors */
3020 if (largs.new_lock_owner != 0) {
3021 nfs_increment_open_seqid(status, largs.open_seqid);
3022 if (status == 0)
3023 nfs_confirm_seqid(&lsp->ls_seqid, 0);
8d0a8a9d 3024 }
06735b34
TM		 3025 nfs_free_seqid(largs.open_seqid);
3026 } else
1da177e4 3027 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
06735b34
TM		 3028 /* increment lock seqid on success, and seqid mutating errors*/
3029 nfs_increment_lock_seqid(status, largs.lock_seqid);
1da177e4 3030 /* save the returned stateid. */
cee54fc9 3031 if (status == 0) {
06735b34
TM		 3032 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3033 sizeof(lsp->ls_stateid.data));
cee54fc9
TM		 3034 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3035 } else if (status == -NFS4ERR_DENIED)
1da177e4 3036 status = -EAGAIN;
06735b34
TM		 3037out:
3038 nfs_free_seqid(largs.lock_seqid);
1da177e4
LT		 3039 return status;
3040}
3041
3042static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3043{
202b50dc
TM		 3044 struct nfs_server *server = NFS_SERVER(state->inode);
3045 struct nfs4_exception exception = { };
3046 int err;
3047
6bfc93ef
TM		 3048 /* Cache the lock if possible... */
3049 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3050 return 0;
202b50dc
TM		 3051 do {
3052 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3053 if (err != -NFS4ERR_DELAY)
3054 break;
3055 nfs4_handle_exception(server, err, &exception);
3056 } while (exception.retry);
3057 return err;
1da177e4
LT		 3058}
3059
3060static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3061{
202b50dc
TM		 3062 struct nfs_server *server = NFS_SERVER(state->inode);
3063 struct nfs4_exception exception = { };
3064 int err;
3065
6bfc93ef
TM		 3066 err = nfs4_set_lock_state(state, request);
3067 if (err != 0)
3068 return err;
202b50dc
TM		 3069 do {
3070 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3071 if (err != -NFS4ERR_DELAY)
3072 break;
3073 nfs4_handle_exception(server, err, &exception);
3074 } while (exception.retry);
3075 return err;
1da177e4
LT		 3076}
3077
3078static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3079{
3080 struct nfs4_client *clp = state->owner->so_client;
3081 int status;
3082
6bfc93ef 3083 /* Is this a delegated open? */
ff604066 3084 if (NFS_I(state->inode)->delegation_state != 0) {
6bfc93ef
TM		 3085 /* Yes: cache locks! */
3086 status = do_vfs_lock(request->fl_file, request);
3087 /* ...but avoid races with delegation recall... */
3088 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
ff604066 3089 return status;
1da177e4 3090 }
ff604066 3091 down_read(&clp->cl_sem);
6bfc93ef
TM		 3092 status = nfs4_set_lock_state(state, request);
3093 if (status != 0)
3094 goto out;
3095 status = _nfs4_do_setlk(state, cmd, request, 0);
3096 if (status != 0)
3097 goto out;
3098 /* Note: we always want to sleep here! */
3099 request->fl_flags |= FL_SLEEP;
3100 if (do_vfs_lock(request->fl_file, request) < 0)
3101 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3102out:
1da177e4
LT		 3103 up_read(&clp->cl_sem);
3104 return status;
3105}
3106
3107static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3108{
3109 struct nfs4_exception exception = { };
3110 int err;
3111
3112 do {
3113 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3114 _nfs4_proc_setlk(state, cmd, request),
3115 &exception);
3116 } while (exception.retry);
3117 return err;
3118}
3119
3120static int
3121nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3122{
3123 struct nfs_open_context *ctx;
3124 struct nfs4_state *state;
3125 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3126 int status;
3127
3128 /* verify open state */
3129 ctx = (struct nfs_open_context *)filp->private_data;
3130 state = ctx->state;
3131
3132 if (request->fl_start < 0 || request->fl_end < 0)
3133 return -EINVAL;
3134
3135 if (IS_GETLK(cmd))
3136 return nfs4_proc_getlk(state, F_GETLK, request);
3137
3138 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3139 return -EINVAL;
3140
3141 if (request->fl_type == F_UNLCK)
3142 return nfs4_proc_unlck(state, cmd, request);
3143
3144 do {
3145 status = nfs4_proc_setlk(state, cmd, request);
3146 if ((status != -EAGAIN) || IS_SETLK(cmd))
3147 break;
3148 timeout = nfs4_set_lock_task_retry(timeout);
3149 status = -ERESTARTSYS;
3150 if (signalled())
3151 break;
3152 } while(status < 0);
1da177e4
LT		 3153 return status;
3154}
3155
888e694c
TM		 3156int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3157{
3158 struct nfs_server *server = NFS_SERVER(state->inode);
3159 struct nfs4_exception exception = { };
3160 int err;
3161
3162 err = nfs4_set_lock_state(state, fl);
3163 if (err != 0)
3164 goto out;
3165 do {
3166 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3167 if (err != -NFS4ERR_DELAY)
3168 break;
3169 err = nfs4_handle_exception(server, err, &exception);
3170 } while (exception.retry);
3171out:
3172 return err;
3173}
6b3b5496 3174
aa1870af
BF		 3175#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3176
6b3b5496
BF		 3177int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3178 size_t buflen, int flags)
3179{
4b580ee3
BF		 3180 struct inode *inode = dentry->d_inode;
3181
3182 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3183 return -EOPNOTSUPP;
3184
3185 if (!S_ISREG(inode->i_mode) &&
3186 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3187 return -EPERM;
3188
3189 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3190}
3191
3192/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3193 * and that's what we'll do for e.g. user attributes that haven't been set.
3194 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3195 * attributes in kernel-managed attribute namespaces. */
3196ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3197 size_t buflen)
3198{
aa1870af
BF		 3199 struct inode *inode = dentry->d_inode;
3200
3201 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3202 return -EOPNOTSUPP;
3203
3204 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3205}
3206
3207ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3208{
aa1870af 3209 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496
BF		 3210
3211 if (buf && buflen < len)
3212 return -ERANGE;
3213 if (buf)
aa1870af
BF		 3214 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3215 return len;
6b3b5496
BF		 3216}
3217
1da177e4
LT		 3218struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3219 .recover_open = nfs4_open_reclaim,
3220 .recover_lock = nfs4_lock_reclaim,
3221};
3222
3223struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3224 .recover_open = nfs4_open_expired,
3225 .recover_lock = nfs4_lock_expired,
3226};
3227
6b3b5496
BF		 3228static struct inode_operations nfs4_file_inode_operations = {
3229 .permission = nfs_permission,
3230 .getattr = nfs_getattr,
3231 .setattr = nfs_setattr,
3232 .getxattr = nfs4_getxattr,
3233 .setxattr = nfs4_setxattr,
3234 .listxattr = nfs4_listxattr,
3235};
3236
1da177e4
LT		 3237struct nfs_rpc_ops nfs_v4_clientops = {
3238 .version = 4, /* protocol version */
3239 .dentry_ops = &nfs4_dentry_operations,
3240 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3241 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3242 .getroot = nfs4_proc_get_root,
3243 .getattr = nfs4_proc_getattr,
3244 .setattr = nfs4_proc_setattr,
3245 .lookup = nfs4_proc_lookup,
3246 .access = nfs4_proc_access,
3247 .readlink = nfs4_proc_readlink,
3248 .read = nfs4_proc_read,
3249 .write = nfs4_proc_write,
3250 .commit = nfs4_proc_commit,
3251 .create = nfs4_proc_create,
3252 .remove = nfs4_proc_remove,
3253 .unlink_setup = nfs4_proc_unlink_setup,
3254 .unlink_done = nfs4_proc_unlink_done,
3255 .rename = nfs4_proc_rename,
3256 .link = nfs4_proc_link,
3257 .symlink = nfs4_proc_symlink,
3258 .mkdir = nfs4_proc_mkdir,
3259 .rmdir = nfs4_proc_remove,
3260 .readdir = nfs4_proc_readdir,
3261 .mknod = nfs4_proc_mknod,
3262 .statfs = nfs4_proc_statfs,
3263 .fsinfo = nfs4_proc_fsinfo,
3264 .pathconf = nfs4_proc_pathconf,
3265 .decode_dirent = nfs4_decode_dirent,
3266 .read_setup = nfs4_proc_read_setup,
3267 .write_setup = nfs4_proc_write_setup,
3268 .commit_setup = nfs4_proc_commit_setup,
02a913a7
TM		 3269 .file_open = nfs_open,
3270 .file_release = nfs_release,
1da177e4 3271 .lock = nfs4_proc_lock,
e50a1c2e 3272 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3273};
3274
3275/*
3276 * Local variables:
3277 * c-basic-offset: 8
3278 * End:
3279 */
Linux 6.x block layer and io_uring tree(s)