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NFS: Optimise attribute revalidation on close().
[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);
217 /* Protect against nfs4_find_state() */
ec073428 218 spin_lock(&state->owner->so_lock);
1da177e4
LT		 219 spin_lock(&inode->i_lock);
220 state->state |= open_flags;
221 /* NB! List reordering - see the reclaim code for why. */
222 if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
223 list_move(&state->open_states, &state->owner->so_states);
224 if (open_flags & FMODE_READ)
225 state->nreaders++;
226 memcpy(&state->stateid, stateid, sizeof(state->stateid));
227 spin_unlock(&inode->i_lock);
ec073428 228 spin_unlock(&state->owner->so_lock);
1da177e4
LT		 229}
230
231/*
232 * OPEN_RECLAIM:
233 * reclaim state on the server after a reboot.
1da177e4
LT		 234 */
235static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
236{
237 struct inode *inode = state->inode;
238 struct nfs_server *server = NFS_SERVER(inode);
239 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
240 struct nfs_openargs o_arg = {
241 .fh = NFS_FH(inode),
1da177e4
LT		 242 .id = sp->so_id,
243 .open_flags = state->state,
244 .clientid = server->nfs4_state->cl_clientid,
245 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
246 .bitmask = server->attr_bitmask,
247 };
248 struct nfs_openres o_res = {
249 .server = server, /* Grrr */
250 };
251 struct rpc_message msg = {
252 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
253 .rpc_argp = &o_arg,
254 .rpc_resp = &o_res,
255 .rpc_cred = sp->so_cred,
256 };
257 int status;
258
259 if (delegation != NULL) {
260 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
261 memcpy(&state->stateid, &delegation->stateid,
262 sizeof(state->stateid));
263 set_bit(NFS_DELEGATED_STATE, &state->flags);
264 return 0;
265 }
266 o_arg.u.delegation_type = delegation->type;
267 }
cee54fc9
TM		 268 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
269 if (o_arg.seqid == NULL)
270 return -ENOMEM;
1da177e4 271 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
cee54fc9
TM		 272 /* Confirm the sequence as being established */
273 nfs_confirm_seqid(&sp->so_seqid, status);
274 nfs_increment_open_seqid(status, o_arg.seqid);
1da177e4
LT		 275 if (status == 0) {
276 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
277 if (o_res.delegation_type != 0) {
278 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
279 /* Did the server issue an immediate delegation recall? */
280 if (o_res.do_recall)
281 nfs_async_inode_return_delegation(inode, &o_res.stateid);
282 }
283 }
cee54fc9 284 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 285 clear_bit(NFS_DELEGATED_STATE, &state->flags);
286 /* Ensure we update the inode attributes */
287 NFS_CACHEINV(inode);
288 return status;
289}
290
291static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
292{
293 struct nfs_server *server = NFS_SERVER(state->inode);
294 struct nfs4_exception exception = { };
295 int err;
296 do {
297 err = _nfs4_open_reclaim(sp, state);
202b50dc
TM		 298 if (err != -NFS4ERR_DELAY)
299 break;
300 nfs4_handle_exception(server, err, &exception);
1da177e4
LT		 301 } while (exception.retry);
302 return err;
303}
304
305static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
306{
307 struct nfs4_state_owner *sp = state->owner;
308 struct inode *inode = dentry->d_inode;
309 struct nfs_server *server = NFS_SERVER(inode);
310 struct dentry *parent = dget_parent(dentry);
311 struct nfs_openargs arg = {
312 .fh = NFS_FH(parent->d_inode),
313 .clientid = server->nfs4_state->cl_clientid,
314 .name = &dentry->d_name,
315 .id = sp->so_id,
316 .server = server,
317 .bitmask = server->attr_bitmask,
318 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
319 };
320 struct nfs_openres res = {
321 .server = server,
322 };
323 struct rpc_message msg = {
324 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
325 .rpc_argp = &arg,
326 .rpc_resp = &res,
327 .rpc_cred = sp->so_cred,
328 };
329 int status = 0;
330
1da177e4
LT		 331 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
332 goto out;
333 if (state->state == 0)
334 goto out;
cee54fc9
TM		 335 arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
336 status = -ENOMEM;
337 if (arg.seqid == NULL)
338 goto out;
1da177e4
LT		 339 arg.open_flags = state->state;
340 memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
341 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
cee54fc9 342 nfs_increment_open_seqid(status, arg.seqid);
0a8838f9
TM		 343 if (status != 0)
344 goto out_free;
345 if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
346 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
347 sp, &res.stateid, arg.seqid);
348 if (status != 0)
349 goto out_free;
350 }
351 nfs_confirm_seqid(&sp->so_seqid, 0);
1da177e4
LT		 352 if (status >= 0) {
353 memcpy(state->stateid.data, res.stateid.data,
354 sizeof(state->stateid.data));
355 clear_bit(NFS_DELEGATED_STATE, &state->flags);
356 }
0a8838f9 357out_free:
cee54fc9 358 nfs_free_seqid(arg.seqid);
1da177e4 359out:
1da177e4
LT		 360 dput(parent);
361 return status;
362}
363
364int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
365{
366 struct nfs4_exception exception = { };
367 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
368 int err;
369 do {
370 err = _nfs4_open_delegation_recall(dentry, state);
371 switch (err) {
372 case 0:
373 return err;
374 case -NFS4ERR_STALE_CLIENTID:
375 case -NFS4ERR_STALE_STATEID:
376 case -NFS4ERR_EXPIRED:
377 /* Don't recall a delegation if it was lost */
378 nfs4_schedule_state_recovery(server->nfs4_state);
379 return err;
380 }
381 err = nfs4_handle_exception(server, err, &exception);
382 } while (exception.retry);
383 return err;
384}
385
0a8838f9 386static 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		 387{
388 struct nfs_open_confirmargs arg = {
389 .fh = fh,
cee54fc9 390 .seqid = seqid,
1da177e4
LT		 391 .stateid = *stateid,
392 };
393 struct nfs_open_confirmres res;
394 struct rpc_message msg = {
395 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
396 .rpc_argp = &arg,
397 .rpc_resp = &res,
398 .rpc_cred = sp->so_cred,
399 };
400 int status;
401
402 status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
cee54fc9
TM		 403 /* Confirm the sequence as being established */
404 nfs_confirm_seqid(&sp->so_seqid, status);
405 nfs_increment_open_seqid(status, seqid);
1da177e4
LT		 406 if (status >= 0)
407 memcpy(stateid, &res.stateid, sizeof(*stateid));
408 return status;
409}
410
411static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
412{
413 struct nfs_server *server = NFS_SERVER(dir);
414 struct rpc_message msg = {
415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
416 .rpc_argp = o_arg,
417 .rpc_resp = o_res,
418 .rpc_cred = sp->so_cred,
419 };
420 int status;
421
422 /* Update sequence id. The caller must serialize! */
1da177e4
LT		 423 o_arg->id = sp->so_id;
424 o_arg->clientid = sp->so_client->cl_clientid;
425
426 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
6f926b5b
TM		 427 if (status == 0) {
428 /* OPEN on anything except a regular file is disallowed in NFSv4 */
429 switch (o_res->f_attr->mode & S_IFMT) {
430 case S_IFREG:
431 break;
432 case S_IFLNK:
433 status = -ELOOP;
434 break;
435 case S_IFDIR:
436 status = -EISDIR;
437 break;
438 default:
439 status = -ENOTDIR;
440 }
441 }
442
cee54fc9 443 nfs_increment_open_seqid(status, o_arg->seqid);
1da177e4
LT		 444 if (status != 0)
445 goto out;
56ae19f3
TM		 446 if (o_arg->open_flags & O_CREAT) {
447 update_changeattr(dir, &o_res->cinfo);
448 nfs_post_op_update_inode(dir, o_res->dir_attr);
449 } else
450 nfs_refresh_inode(dir, o_res->dir_attr);
1da177e4
LT		 451 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
452 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
cee54fc9 453 sp, &o_res->stateid, o_arg->seqid);
1da177e4
LT		 454 if (status != 0)
455 goto out;
456 }
cee54fc9 457 nfs_confirm_seqid(&sp->so_seqid, 0);
1da177e4
LT		 458 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
459 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
460out:
461 return status;
462}
463
464static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
465{
466 struct nfs_access_entry cache;
467 int mask = 0;
468 int status;
469
470 if (openflags & FMODE_READ)
471 mask |= MAY_READ;
472 if (openflags & FMODE_WRITE)
473 mask |= MAY_WRITE;
474 status = nfs_access_get_cached(inode, cred, &cache);
475 if (status == 0)
476 goto out;
477
478 /* Be clever: ask server to check for all possible rights */
479 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
480 cache.cred = cred;
481 cache.jiffies = jiffies;
482 status = _nfs4_proc_access(inode, &cache);
483 if (status != 0)
484 return status;
485 nfs_access_add_cache(inode, &cache);
486out:
487 if ((cache.mask & mask) == mask)
488 return 0;
489 return -EACCES;
490}
491
492/*
493 * OPEN_EXPIRED:
494 * reclaim state on the server after a network partition.
495 * Assumes caller holds the appropriate lock
496 */
497static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
498{
499 struct dentry *parent = dget_parent(dentry);
500 struct inode *dir = parent->d_inode;
501 struct inode *inode = state->inode;
502 struct nfs_server *server = NFS_SERVER(dir);
503 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
56ae19f3 504 struct nfs_fattr f_attr, dir_attr;
1da177e4
LT		 505 struct nfs_openargs o_arg = {
506 .fh = NFS_FH(dir),
507 .open_flags = state->state,
508 .name = &dentry->d_name,
509 .bitmask = server->attr_bitmask,
510 .claim = NFS4_OPEN_CLAIM_NULL,
511 };
512 struct nfs_openres o_res = {
513 .f_attr = &f_attr,
56ae19f3 514 .dir_attr = &dir_attr,
1da177e4
LT		 515 .server = server,
516 };
517 int status = 0;
518
519 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
520 status = _nfs4_do_access(inode, sp->so_cred, state->state);
521 if (status < 0)
522 goto out;
523 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
524 set_bit(NFS_DELEGATED_STATE, &state->flags);
525 goto out;
526 }
cee54fc9
TM		 527 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
528 status = -ENOMEM;
529 if (o_arg.seqid == NULL)
530 goto out;
0e574af1 531 nfs_fattr_init(&f_attr);
56ae19f3 532 nfs_fattr_init(&dir_attr);
1da177e4
LT		 533 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
534 if (status != 0)
535 goto out_nodeleg;
536 /* Check if files differ */
537 if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
538 goto out_stale;
539 /* Has the file handle changed? */
540 if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
541 /* Verify if the change attributes are the same */
542 if (f_attr.change_attr != NFS_I(inode)->change_attr)
543 goto out_stale;
544 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
545 goto out_stale;
546 /* Lets just pretend that this is the same file */
547 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
548 NFS_I(inode)->fileid = f_attr.fileid;
549 }
550 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
551 if (o_res.delegation_type != 0) {
552 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
553 nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
554 else
555 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
556 }
557out_nodeleg:
cee54fc9 558 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 559 clear_bit(NFS_DELEGATED_STATE, &state->flags);
560out:
561 dput(parent);
562 return status;
563out_stale:
564 status = -ESTALE;
565 /* Invalidate the state owner so we don't ever use it again */
566 nfs4_drop_state_owner(sp);
567 d_drop(dentry);
568 /* Should we be trying to close that stateid? */
569 goto out_nodeleg;
570}
571
202b50dc
TM		 572static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
573{
574 struct nfs_server *server = NFS_SERVER(dentry->d_inode);
575 struct nfs4_exception exception = { };
576 int err;
577
578 do {
579 err = _nfs4_open_expired(sp, state, dentry);
580 if (err == -NFS4ERR_DELAY)
581 nfs4_handle_exception(server, err, &exception);
582 } while (exception.retry);
583 return err;
584}
585
1da177e4
LT		 586static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
587{
588 struct nfs_inode *nfsi = NFS_I(state->inode);
589 struct nfs_open_context *ctx;
590 int status;
591
592 spin_lock(&state->inode->i_lock);
593 list_for_each_entry(ctx, &nfsi->open_files, list) {
594 if (ctx->state != state)
595 continue;
596 get_nfs_open_context(ctx);
597 spin_unlock(&state->inode->i_lock);
202b50dc 598 status = nfs4_do_open_expired(sp, state, ctx->dentry);
1da177e4
LT		 599 put_nfs_open_context(ctx);
600 return status;
601 }
602 spin_unlock(&state->inode->i_lock);
603 return -ENOENT;
604}
605
606/*
607 * Returns an nfs4_state + an extra reference to the inode
608 */
609static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
610{
611 struct nfs_delegation *delegation;
612 struct nfs_server *server = NFS_SERVER(inode);
613 struct nfs4_client *clp = server->nfs4_state;
614 struct nfs_inode *nfsi = NFS_I(inode);
615 struct nfs4_state_owner *sp = NULL;
616 struct nfs4_state *state = NULL;
617 int open_flags = flags & (FMODE_READ|FMODE_WRITE);
618 int err;
619
620 /* Protect against reboot recovery - NOTE ORDER! */
621 down_read(&clp->cl_sem);
622 /* Protect against delegation recall */
623 down_read(&nfsi->rwsem);
624 delegation = NFS_I(inode)->delegation;
625 err = -ENOENT;
626 if (delegation == NULL || (delegation->type & open_flags) != open_flags)
627 goto out_err;
628 err = -ENOMEM;
629 if (!(sp = nfs4_get_state_owner(server, cred))) {
630 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
631 goto out_err;
632 }
1da177e4
LT		 633 state = nfs4_get_open_state(inode, sp);
634 if (state == NULL)
635 goto out_err;
636
637 err = -ENOENT;
638 if ((state->state & open_flags) == open_flags) {
639 spin_lock(&inode->i_lock);
640 if (open_flags & FMODE_READ)
641 state->nreaders++;
642 if (open_flags & FMODE_WRITE)
643 state->nwriters++;
644 spin_unlock(&inode->i_lock);
645 goto out_ok;
646 } else if (state->state != 0)
647 goto out_err;
648
649 lock_kernel();
650 err = _nfs4_do_access(inode, cred, open_flags);
651 unlock_kernel();
652 if (err != 0)
653 goto out_err;
654 set_bit(NFS_DELEGATED_STATE, &state->flags);
655 update_open_stateid(state, &delegation->stateid, open_flags);
656out_ok:
1da177e4
LT		 657 nfs4_put_state_owner(sp);
658 up_read(&nfsi->rwsem);
659 up_read(&clp->cl_sem);
660 igrab(inode);
661 *res = state;
662 return 0;
663out_err:
664 if (sp != NULL) {
665 if (state != NULL)
666 nfs4_put_open_state(state);
1da177e4
LT		 667 nfs4_put_state_owner(sp);
668 }
669 up_read(&nfsi->rwsem);
670 up_read(&clp->cl_sem);
b8e5c4c2
TM		 671 if (err != -EACCES)
672 nfs_inode_return_delegation(inode);
1da177e4
LT		 673 return err;
674}
675
676static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
677{
678 struct nfs4_exception exception = { };
679 struct nfs4_state *res;
680 int err;
681
682 do {
683 err = _nfs4_open_delegated(inode, flags, cred, &res);
684 if (err == 0)
685 break;
686 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
687 err, &exception));
688 } while (exception.retry);
689 return res;
690}
691
692/*
693 * Returns an nfs4_state + an referenced inode
694 */
695static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
696{
697 struct nfs4_state_owner *sp;
698 struct nfs4_state *state = NULL;
699 struct nfs_server *server = NFS_SERVER(dir);
700 struct nfs4_client *clp = server->nfs4_state;
701 struct inode *inode = NULL;
702 int status;
56ae19f3 703 struct nfs_fattr f_attr, dir_attr;
1da177e4
LT		 704 struct nfs_openargs o_arg = {
705 .fh = NFS_FH(dir),
706 .open_flags = flags,
707 .name = &dentry->d_name,
708 .server = server,
709 .bitmask = server->attr_bitmask,
710 .claim = NFS4_OPEN_CLAIM_NULL,
711 };
712 struct nfs_openres o_res = {
713 .f_attr = &f_attr,
56ae19f3 714 .dir_attr = &dir_attr,
1da177e4
LT		 715 .server = server,
716 };
717
718 /* Protect against reboot recovery conflicts */
719 down_read(&clp->cl_sem);
720 status = -ENOMEM;
721 if (!(sp = nfs4_get_state_owner(server, cred))) {
722 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
723 goto out_err;
724 }
725 if (flags & O_EXCL) {
726 u32 *p = (u32 *) o_arg.u.verifier.data;
727 p[0] = jiffies;
728 p[1] = current->pid;
729 } else
730 o_arg.u.attrs = sattr;
731 /* Serialization for the sequence id */
1da177e4 732
cee54fc9
TM		 733 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
734 if (o_arg.seqid == NULL)
735 return -ENOMEM;
0e574af1 736 nfs_fattr_init(&f_attr);
56ae19f3 737 nfs_fattr_init(&dir_attr);
1da177e4
LT		 738 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
739 if (status != 0)
740 goto out_err;
741
742 status = -ENOMEM;
743 inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
744 if (!inode)
745 goto out_err;
746 state = nfs4_get_open_state(inode, sp);
747 if (!state)
748 goto out_err;
749 update_open_stateid(state, &o_res.stateid, flags);
750 if (o_res.delegation_type != 0)
751 nfs_inode_set_delegation(inode, cred, &o_res);
cee54fc9 752 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 753 nfs4_put_state_owner(sp);
754 up_read(&clp->cl_sem);
755 *res = state;
756 return 0;
757out_err:
758 if (sp != NULL) {
759 if (state != NULL)
760 nfs4_put_open_state(state);
cee54fc9 761 nfs_free_seqid(o_arg.seqid);
1da177e4
LT		 762 nfs4_put_state_owner(sp);
763 }
764 /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
765 up_read(&clp->cl_sem);
766 if (inode != NULL)
767 iput(inode);
768 *res = NULL;
769 return status;
770}
771
772
773static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
774{
775 struct nfs4_exception exception = { };
776 struct nfs4_state *res;
777 int status;
778
779 do {
780 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
781 if (status == 0)
782 break;
783 /* NOTE: BAD_SEQID means the server and client disagree about the
784 * book-keeping w.r.t. state-changing operations
785 * (OPEN/CLOSE/LOCK/LOCKU...)
786 * It is actually a sign of a bug on the client or on the server.
787 *
788 * If we receive a BAD_SEQID error in the particular case of
cee54fc9 789 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1da177e4
LT		 790 * have unhashed the old state_owner for us, and that we can
791 * therefore safely retry using a new one. We should still warn
792 * the user though...
793 */
794 if (status == -NFS4ERR_BAD_SEQID) {
795 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
796 exception.retry = 1;
797 continue;
798 }
550f5747
TM		 799 /*
800 * BAD_STATEID on OPEN means that the server cancelled our
801 * state before it received the OPEN_CONFIRM.
802 * Recover by retrying the request as per the discussion
803 * on Page 181 of RFC3530.
804 */
805 if (status == -NFS4ERR_BAD_STATEID) {
806 exception.retry = 1;
807 continue;
808 }
1da177e4
LT		 809 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
810 status, &exception));
811 } while (exception.retry);
812 return res;
813}
814
815static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
816 struct nfs_fh *fhandle, struct iattr *sattr,
817 struct nfs4_state *state)
818{
819 struct nfs_setattrargs arg = {
820 .fh = fhandle,
821 .iap = sattr,
822 .server = server,
823 .bitmask = server->attr_bitmask,
824 };
825 struct nfs_setattrres res = {
826 .fattr = fattr,
827 .server = server,
828 };
829 struct rpc_message msg = {
830 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
831 .rpc_argp = &arg,
832 .rpc_resp = &res,
833 };
65e4308d 834 int status;
1da177e4 835
0e574af1 836 nfs_fattr_init(fattr);
1da177e4 837
08e9eac4 838 if (state != NULL) {
1da177e4 839 msg.rpc_cred = state->owner->so_cred;
08e9eac4
TM		 840 nfs4_copy_stateid(&arg.stateid, state, current->files);
841 } else
1da177e4
LT		 842 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
843
65e4308d
TM		 844 status = rpc_call_sync(server->client, &msg, 0);
845 return status;
1da177e4
LT		 846}
847
848static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
849 struct nfs_fh *fhandle, struct iattr *sattr,
850 struct nfs4_state *state)
851{
852 struct nfs4_exception exception = { };
853 int err;
854 do {
855 err = nfs4_handle_exception(server,
856 _nfs4_do_setattr(server, fattr, fhandle, sattr,
857 state),
858 &exception);
859 } while (exception.retry);
860 return err;
861}
862
863struct nfs4_closedata {
864 struct inode *inode;
865 struct nfs4_state *state;
866 struct nfs_closeargs arg;
867 struct nfs_closeres res;
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:
898 state->state = calldata->arg.open_flags;
899 nfs4_schedule_state_recovery(server->nfs4_state);
900 break;
901 default:
902 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
903 rpc_restart_call(task);
904 return;
905 }
906 }
907 state->state = calldata->arg.open_flags;
9512135d 908 nfs4_free_closedata(calldata);
1da177e4
LT		 909}
910
9512135d 911static void nfs4_close_begin(struct rpc_task *task)
1da177e4 912{
9512135d
TM		 913 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
914 struct nfs4_state *state = calldata->state;
1da177e4
LT		 915 struct rpc_message msg = {
916 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
917 .rpc_argp = &calldata->arg,
918 .rpc_resp = &calldata->res,
9512135d 919 .rpc_cred = state->owner->so_cred,
1da177e4 920 };
9512135d
TM		 921 int mode = 0;
922 int status;
923
924 status = nfs_wait_on_sequence(calldata->arg.seqid, task);
925 if (status != 0)
926 return;
927 /* Don't reorder reads */
928 smp_rmb();
929 /* Recalculate the new open mode in case someone reopened the file
930 * while we were waiting in line to be scheduled.
931 */
932 if (state->nreaders != 0)
933 mode |= FMODE_READ;
934 if (state->nwriters != 0)
935 mode |= FMODE_WRITE;
936 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
937 state->state = mode;
938 if (mode == state->state) {
939 nfs4_free_closedata(calldata);
940 task->tk_exit = NULL;
941 rpc_exit(task, 0);
942 return;
943 }
944 if (mode != 0)
1da177e4 945 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
9512135d
TM		 946 calldata->arg.open_flags = mode;
947 rpc_call_setup(task, &msg, 0);
1da177e4
LT		 948}
949
950/*
951 * It is possible for data to be read/written from a mem-mapped file
952 * after the sys_close call (which hits the vfs layer as a flush).
953 * This means that we can't safely call nfsv4 close on a file until
954 * the inode is cleared. This in turn means that we are not good
955 * NFSv4 citizens - we do not indicate to the server to update the file's
956 * share state even when we are done with one of the three share
957 * stateid's in the inode.
958 *
959 * NOTE: Caller must be holding the sp->so_owner semaphore!
960 */
961int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
962{
963 struct nfs4_closedata *calldata;
9512135d 964 int status = -ENOMEM;
1da177e4 965
9512135d 966 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1da177e4 967 if (calldata == NULL)
9512135d 968 goto out;
1da177e4
LT		 969 calldata->inode = inode;
970 calldata->state = state;
971 calldata->arg.fh = NFS_FH(inode);
9512135d 972 calldata->arg.stateid = &state->stateid;
1da177e4 973 /* Serialization for the sequence id */
cee54fc9 974 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
9512135d
TM		 975 if (calldata->arg.seqid == NULL)
976 goto out_free_calldata;
977
978 status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_close_begin,
979 nfs4_close_done, calldata);
980 if (status == 0)
981 goto out;
982
983 nfs_free_seqid(calldata->arg.seqid);
984out_free_calldata:
985 kfree(calldata);
986out:
987 return status;
1da177e4
LT		 988}
989
02a913a7
TM		 990static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
991{
992 struct file *filp;
993
994 filp = lookup_instantiate_filp(nd, dentry, NULL);
995 if (!IS_ERR(filp)) {
996 struct nfs_open_context *ctx;
997 ctx = (struct nfs_open_context *)filp->private_data;
998 ctx->state = state;
999 } else
1000 nfs4_close_state(state, nd->intent.open.flags);
1001}
1002
1003struct dentry *
1da177e4
LT		 1004nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1005{
1006 struct iattr attr;
1007 struct rpc_cred *cred;
1008 struct nfs4_state *state;
02a913a7 1009 struct dentry *res;
1da177e4
LT		 1010
1011 if (nd->flags & LOOKUP_CREATE) {
1012 attr.ia_mode = nd->intent.open.create_mode;
1013 attr.ia_valid = ATTR_MODE;
1014 if (!IS_POSIXACL(dir))
1015 attr.ia_mode &= ~current->fs->umask;
1016 } else {
1017 attr.ia_valid = 0;
1018 BUG_ON(nd->intent.open.flags & O_CREAT);
1019 }
1020
1021 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1022 if (IS_ERR(cred))
02a913a7 1023 return (struct dentry *)cred;
1da177e4
LT		 1024 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1025 put_rpccred(cred);
02a913a7
TM		 1026 if (IS_ERR(state)) {
1027 if (PTR_ERR(state) == -ENOENT)
1028 d_add(dentry, NULL);
1029 return (struct dentry *)state;
1030 }
1031 res = d_add_unique(dentry, state->inode);
1032 if (res != NULL)
1033 dentry = res;
1034 nfs4_intent_set_file(nd, dentry, state);
1035 return res;
1da177e4
LT		 1036}
1037
1038int
02a913a7 1039nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1da177e4
LT		 1040{
1041 struct rpc_cred *cred;
1042 struct nfs4_state *state;
1043 struct inode *inode;
1044
1045 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1046 if (IS_ERR(cred))
1047 return PTR_ERR(cred);
1048 state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1049 if (IS_ERR(state))
1050 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1051 put_rpccred(cred);
02a913a7
TM		 1052 if (IS_ERR(state)) {
1053 switch (PTR_ERR(state)) {
1054 case -EPERM:
1055 case -EACCES:
1056 case -EDQUOT:
1057 case -ENOSPC:
1058 case -EROFS:
1059 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1060 return 1;
1061 case -ENOENT:
1062 if (dentry->d_inode == NULL)
1063 return 1;
1064 }
1065 goto out_drop;
1066 }
1da177e4 1067 inode = state->inode;
02a913a7 1068 iput(inode);
1da177e4 1069 if (inode == dentry->d_inode) {
02a913a7 1070 nfs4_intent_set_file(nd, dentry, state);
1da177e4
LT		 1071 return 1;
1072 }
1da177e4 1073 nfs4_close_state(state, openflags);
02a913a7
TM		 1074out_drop:
1075 d_drop(dentry);
1da177e4
LT		 1076 return 0;
1077}
1078
1079
1080static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1081{
1082 struct nfs4_server_caps_res res = {};
1083 struct rpc_message msg = {
1084 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1085 .rpc_argp = fhandle,
1086 .rpc_resp = &res,
1087 };
1088 int status;
1089
1090 status = rpc_call_sync(server->client, &msg, 0);
1091 if (status == 0) {
1092 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1093 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1094 server->caps |= NFS_CAP_ACLS;
1095 if (res.has_links != 0)
1096 server->caps |= NFS_CAP_HARDLINKS;
1097 if (res.has_symlinks != 0)
1098 server->caps |= NFS_CAP_SYMLINKS;
1099 server->acl_bitmask = res.acl_bitmask;
1100 }
1101 return status;
1102}
1103
1104static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1105{
1106 struct nfs4_exception exception = { };
1107 int err;
1108 do {
1109 err = nfs4_handle_exception(server,
1110 _nfs4_server_capabilities(server, fhandle),
1111 &exception);
1112 } while (exception.retry);
1113 return err;
1114}
1115
1116static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1117 struct nfs_fsinfo *info)
1118{
1da177e4
LT		 1119 struct nfs4_lookup_root_arg args = {
1120 .bitmask = nfs4_fattr_bitmap,
1121 };
1122 struct nfs4_lookup_res res = {
1123 .server = server,
0e574af1 1124 .fattr = info->fattr,
1da177e4
LT		 1125 .fh = fhandle,
1126 };
1127 struct rpc_message msg = {
1128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1129 .rpc_argp = &args,
1130 .rpc_resp = &res,
1131 };
0e574af1 1132 nfs_fattr_init(info->fattr);
1da177e4
LT		 1133 return rpc_call_sync(server->client, &msg, 0);
1134}
1135
1136static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1137 struct nfs_fsinfo *info)
1138{
1139 struct nfs4_exception exception = { };
1140 int err;
1141 do {
1142 err = nfs4_handle_exception(server,
1143 _nfs4_lookup_root(server, fhandle, info),
1144 &exception);
1145 } while (exception.retry);
1146 return err;
1147}
1148
1149static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1150 struct nfs_fsinfo *info)
1151{
1152 struct nfs_fattr * fattr = info->fattr;
1153 unsigned char * p;
1154 struct qstr q;
1155 struct nfs4_lookup_arg args = {
1156 .dir_fh = fhandle,
1157 .name = &q,
1158 .bitmask = nfs4_fattr_bitmap,
1159 };
1160 struct nfs4_lookup_res res = {
1161 .server = server,
1162 .fattr = fattr,
1163 .fh = fhandle,
1164 };
1165 struct rpc_message msg = {
1166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1167 .rpc_argp = &args,
1168 .rpc_resp = &res,
1169 };
1170 int status;
1171
1172 /*
1173 * Now we do a separate LOOKUP for each component of the mount path.
1174 * The LOOKUPs are done separately so that we can conveniently
1175 * catch an ERR_WRONGSEC if it occurs along the way...
1176 */
1177 status = nfs4_lookup_root(server, fhandle, info);
1178 if (status)
1179 goto out;
1180
1181 p = server->mnt_path;
1182 for (;;) {
1183 struct nfs4_exception exception = { };
1184
1185 while (*p == '/')
1186 p++;
1187 if (!*p)
1188 break;
1189 q.name = p;
1190 while (*p && (*p != '/'))
1191 p++;
1192 q.len = p - q.name;
1193
1194 do {
0e574af1 1195 nfs_fattr_init(fattr);
1da177e4
LT		 1196 status = nfs4_handle_exception(server,
1197 rpc_call_sync(server->client, &msg, 0),
1198 &exception);
1199 } while (exception.retry);
1200 if (status == 0)
1201 continue;
1202 if (status == -ENOENT) {
1203 printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1204 printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1205 }
1206 break;
1207 }
1208 if (status == 0)
1209 status = nfs4_server_capabilities(server, fhandle);
1210 if (status == 0)
1211 status = nfs4_do_fsinfo(server, fhandle, info);
1212out:
1213 return status;
1214}
1215
1216static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1217{
1218 struct nfs4_getattr_arg args = {
1219 .fh = fhandle,
1220 .bitmask = server->attr_bitmask,
1221 };
1222 struct nfs4_getattr_res res = {
1223 .fattr = fattr,
1224 .server = server,
1225 };
1226 struct rpc_message msg = {
1227 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1228 .rpc_argp = &args,
1229 .rpc_resp = &res,
1230 };
1231
0e574af1 1232 nfs_fattr_init(fattr);
1da177e4
LT		 1233 return rpc_call_sync(server->client, &msg, 0);
1234}
1235
1236static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1237{
1238 struct nfs4_exception exception = { };
1239 int err;
1240 do {
1241 err = nfs4_handle_exception(server,
1242 _nfs4_proc_getattr(server, fhandle, fattr),
1243 &exception);
1244 } while (exception.retry);
1245 return err;
1246}
1247
1248/*
1249 * The file is not closed if it is opened due to the a request to change
1250 * the size of the file. The open call will not be needed once the
1251 * VFS layer lookup-intents are implemented.
1252 *
1253 * Close is called when the inode is destroyed.
1254 * If we haven't opened the file for O_WRONLY, we
1255 * need to in the size_change case to obtain a stateid.
1256 *
1257 * Got race?
1258 * Because OPEN is always done by name in nfsv4, it is
1259 * possible that we opened a different file by the same
1260 * name. We can recognize this race condition, but we
1261 * can't do anything about it besides returning an error.
1262 *
1263 * This will be fixed with VFS changes (lookup-intent).
1264 */
1265static int
1266nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1267 struct iattr *sattr)
1268{
08e9eac4
TM		 1269 struct rpc_cred *cred;
1270 struct inode *inode = dentry->d_inode;
1271 struct nfs4_state *state;
1da177e4
LT		 1272 int status;
1273
0e574af1 1274 nfs_fattr_init(fattr);
1da177e4 1275
08e9eac4
TM		 1276 cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1277 if (IS_ERR(cred))
1278 return PTR_ERR(cred);
1279 /* Search for an existing WRITE delegation first */
1280 state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1281 if (!IS_ERR(state)) {
1282 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1283 iput(inode);
1284 } else {
1285 /* Search for an existing open(O_WRITE) stateid */
1da177e4 1286 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1da177e4 1287 }
08e9eac4 1288
1da177e4
LT		 1289 status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1290 NFS_FH(inode), sattr, state);
65e4308d
TM		 1291 if (status == 0)
1292 nfs_setattr_update_inode(inode, sattr);
08e9eac4 1293 if (state != NULL)
1da177e4 1294 nfs4_close_state(state, FMODE_WRITE);
08e9eac4 1295 put_rpccred(cred);
1da177e4
LT		 1296 return status;
1297}
1298
1299static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1300 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1301{
1302 int status;
1303 struct nfs_server *server = NFS_SERVER(dir);
1304 struct nfs4_lookup_arg args = {
1305 .bitmask = server->attr_bitmask,
1306 .dir_fh = NFS_FH(dir),
1307 .name = name,
1308 };
1309 struct nfs4_lookup_res res = {
1310 .server = server,
1311 .fattr = fattr,
1312 .fh = fhandle,
1313 };
1314 struct rpc_message msg = {
1315 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1316 .rpc_argp = &args,
1317 .rpc_resp = &res,
1318 };
1319
0e574af1 1320 nfs_fattr_init(fattr);
1da177e4
LT		 1321
1322 dprintk("NFS call lookup %s\n", name->name);
1323 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1324 dprintk("NFS reply lookup: %d\n", status);
1325 return status;
1326}
1327
1328static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1329{
1330 struct nfs4_exception exception = { };
1331 int err;
1332 do {
1333 err = nfs4_handle_exception(NFS_SERVER(dir),
1334 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1335 &exception);
1336 } while (exception.retry);
1337 return err;
1338}
1339
1340static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1341{
1342 struct nfs4_accessargs args = {
1343 .fh = NFS_FH(inode),
1344 };
1345 struct nfs4_accessres res = { 0 };
1346 struct rpc_message msg = {
1347 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1348 .rpc_argp = &args,
1349 .rpc_resp = &res,
1350 .rpc_cred = entry->cred,
1351 };
1352 int mode = entry->mask;
1353 int status;
1354
1355 /*
1356 * Determine which access bits we want to ask for...
1357 */
1358 if (mode & MAY_READ)
1359 args.access |= NFS4_ACCESS_READ;
1360 if (S_ISDIR(inode->i_mode)) {
1361 if (mode & MAY_WRITE)
1362 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1363 if (mode & MAY_EXEC)
1364 args.access |= NFS4_ACCESS_LOOKUP;
1365 } else {
1366 if (mode & MAY_WRITE)
1367 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1368 if (mode & MAY_EXEC)
1369 args.access |= NFS4_ACCESS_EXECUTE;
1370 }
1371 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1372 if (!status) {
1373 entry->mask = 0;
1374 if (res.access & NFS4_ACCESS_READ)
1375 entry->mask |= MAY_READ;
1376 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1377 entry->mask |= MAY_WRITE;
1378 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1379 entry->mask |= MAY_EXEC;
1380 }
1381 return status;
1382}
1383
1384static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1385{
1386 struct nfs4_exception exception = { };
1387 int err;
1388 do {
1389 err = nfs4_handle_exception(NFS_SERVER(inode),
1390 _nfs4_proc_access(inode, entry),
1391 &exception);
1392 } while (exception.retry);
1393 return err;
1394}
1395
1396/*
1397 * TODO: For the time being, we don't try to get any attributes
1398 * along with any of the zero-copy operations READ, READDIR,
1399 * READLINK, WRITE.
1400 *
1401 * In the case of the first three, we want to put the GETATTR
1402 * after the read-type operation -- this is because it is hard
1403 * to predict the length of a GETATTR response in v4, and thus
1404 * align the READ data correctly. This means that the GETATTR
1405 * may end up partially falling into the page cache, and we should
1406 * shift it into the 'tail' of the xdr_buf before processing.
1407 * To do this efficiently, we need to know the total length
1408 * of data received, which doesn't seem to be available outside
1409 * of the RPC layer.
1410 *
1411 * In the case of WRITE, we also want to put the GETATTR after
1412 * the operation -- in this case because we want to make sure
1413 * we get the post-operation mtime and size. This means that
1414 * we can't use xdr_encode_pages() as written: we need a variant
1415 * of it which would leave room in the 'tail' iovec.
1416 *
1417 * Both of these changes to the XDR layer would in fact be quite
1418 * minor, but I decided to leave them for a subsequent patch.
1419 */
1420static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1421 unsigned int pgbase, unsigned int pglen)
1422{
1423 struct nfs4_readlink args = {
1424 .fh = NFS_FH(inode),
1425 .pgbase = pgbase,
1426 .pglen = pglen,
1427 .pages = &page,
1428 };
1429 struct rpc_message msg = {
1430 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1431 .rpc_argp = &args,
1432 .rpc_resp = NULL,
1433 };
1434
1435 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1436}
1437
1438static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1439 unsigned int pgbase, unsigned int pglen)
1440{
1441 struct nfs4_exception exception = { };
1442 int err;
1443 do {
1444 err = nfs4_handle_exception(NFS_SERVER(inode),
1445 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1446 &exception);
1447 } while (exception.retry);
1448 return err;
1449}
1450
1451static int _nfs4_proc_read(struct nfs_read_data *rdata)
1452{
1453 int flags = rdata->flags;
1454 struct inode *inode = rdata->inode;
1455 struct nfs_fattr *fattr = rdata->res.fattr;
1456 struct nfs_server *server = NFS_SERVER(inode);
1457 struct rpc_message msg = {
1458 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1459 .rpc_argp = &rdata->args,
1460 .rpc_resp = &rdata->res,
1461 .rpc_cred = rdata->cred,
1462 };
1463 unsigned long timestamp = jiffies;
1464 int status;
1465
1466 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
1467 (long long) rdata->args.offset);
1468
0e574af1 1469 nfs_fattr_init(fattr);
1da177e4
LT		 1470 status = rpc_call_sync(server->client, &msg, flags);
1471 if (!status)
1472 renew_lease(server, timestamp);
1473 dprintk("NFS reply read: %d\n", status);
1474 return status;
1475}
1476
1477static int nfs4_proc_read(struct nfs_read_data *rdata)
1478{
1479 struct nfs4_exception exception = { };
1480 int err;
1481 do {
1482 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1483 _nfs4_proc_read(rdata),
1484 &exception);
1485 } while (exception.retry);
1486 return err;
1487}
1488
1489static int _nfs4_proc_write(struct nfs_write_data *wdata)
1490{
1491 int rpcflags = wdata->flags;
1492 struct inode *inode = wdata->inode;
1493 struct nfs_fattr *fattr = wdata->res.fattr;
1494 struct nfs_server *server = NFS_SERVER(inode);
1495 struct rpc_message msg = {
1496 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1497 .rpc_argp = &wdata->args,
1498 .rpc_resp = &wdata->res,
1499 .rpc_cred = wdata->cred,
1500 };
1501 int status;
1502
1503 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
1504 (long long) wdata->args.offset);
1505
0e574af1 1506 nfs_fattr_init(fattr);
1da177e4
LT		 1507 status = rpc_call_sync(server->client, &msg, rpcflags);
1508 dprintk("NFS reply write: %d\n", status);
1509 return status;
1510}
1511
1512static int nfs4_proc_write(struct nfs_write_data *wdata)
1513{
1514 struct nfs4_exception exception = { };
1515 int err;
1516 do {
1517 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1518 _nfs4_proc_write(wdata),
1519 &exception);
1520 } while (exception.retry);
1521 return err;
1522}
1523
1524static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1525{
1526 struct inode *inode = cdata->inode;
1527 struct nfs_fattr *fattr = cdata->res.fattr;
1528 struct nfs_server *server = NFS_SERVER(inode);
1529 struct rpc_message msg = {
1530 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1531 .rpc_argp = &cdata->args,
1532 .rpc_resp = &cdata->res,
1533 .rpc_cred = cdata->cred,
1534 };
1535 int status;
1536
1537 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
1538 (long long) cdata->args.offset);
1539
0e574af1 1540 nfs_fattr_init(fattr);
1da177e4
LT		 1541 status = rpc_call_sync(server->client, &msg, 0);
1542 dprintk("NFS reply commit: %d\n", status);
1543 return status;
1544}
1545
1546static int nfs4_proc_commit(struct nfs_write_data *cdata)
1547{
1548 struct nfs4_exception exception = { };
1549 int err;
1550 do {
1551 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1552 _nfs4_proc_commit(cdata),
1553 &exception);
1554 } while (exception.retry);
1555 return err;
1556}
1557
1558/*
1559 * Got race?
1560 * We will need to arrange for the VFS layer to provide an atomic open.
1561 * Until then, this create/open method is prone to inefficiency and race
1562 * conditions due to the lookup, create, and open VFS calls from sys_open()
1563 * placed on the wire.
1564 *
1565 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1566 * The file will be opened again in the subsequent VFS open call
1567 * (nfs4_proc_file_open).
1568 *
1569 * The open for read will just hang around to be used by any process that
1570 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1571 */
1572
1573static int
1574nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
02a913a7 1575 int flags, struct nameidata *nd)
1da177e4
LT		 1576{
1577 struct nfs4_state *state;
1578 struct rpc_cred *cred;
1579 int status = 0;
1580
1581 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1582 if (IS_ERR(cred)) {
1583 status = PTR_ERR(cred);
1584 goto out;
1585 }
1586 state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1587 put_rpccred(cred);
1588 if (IS_ERR(state)) {
1589 status = PTR_ERR(state);
1590 goto out;
1591 }
1592 d_instantiate(dentry, state->inode);
1593 if (flags & O_EXCL) {
1594 struct nfs_fattr fattr;
1595 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1596 NFS_FH(state->inode), sattr, state);
02a913a7 1597 if (status == 0)
65e4308d 1598 nfs_setattr_update_inode(state->inode, sattr);
02a913a7
TM		 1599 }
1600 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1601 nfs4_intent_set_file(nd, dentry, state);
1602 else
1603 nfs4_close_state(state, flags);
1da177e4
LT		 1604out:
1605 return status;
1606}
1607
1608static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1609{
1610 struct nfs4_remove_arg args = {
1611 .fh = NFS_FH(dir),
1612 .name = name,
1613 };
1614 struct nfs4_change_info res;
1615 struct rpc_message msg = {
1616 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1617 .rpc_argp = &args,
1618 .rpc_resp = &res,
1619 };
1620 int status;
1621
1622 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1623 if (status == 0)
1624 update_changeattr(dir, &res);
1625 return status;
1626}
1627
1628static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1629{
1630 struct nfs4_exception exception = { };
1631 int err;
1632 do {
1633 err = nfs4_handle_exception(NFS_SERVER(dir),
1634 _nfs4_proc_remove(dir, name),
1635 &exception);
1636 } while (exception.retry);
1637 return err;
1638}
1639
1640struct unlink_desc {
1641 struct nfs4_remove_arg args;
1642 struct nfs4_change_info res;
1643};
1644
1645static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1646 struct qstr *name)
1647{
1648 struct unlink_desc *up;
1649
1650 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1651 if (!up)
1652 return -ENOMEM;
1653
1654 up->args.fh = NFS_FH(dir->d_inode);
1655 up->args.name = name;
1656
1657 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1658 msg->rpc_argp = &up->args;
1659 msg->rpc_resp = &up->res;
1660 return 0;
1661}
1662
1663static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1664{
1665 struct rpc_message *msg = &task->tk_msg;
1666 struct unlink_desc *up;
1667
1668 if (msg->rpc_resp != NULL) {
1669 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1670 update_changeattr(dir->d_inode, &up->res);
1671 kfree(up);
1672 msg->rpc_resp = NULL;
1673 msg->rpc_argp = NULL;
1674 }
1675 return 0;
1676}
1677
1678static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1679 struct inode *new_dir, struct qstr *new_name)
1680{
1681 struct nfs4_rename_arg arg = {
1682 .old_dir = NFS_FH(old_dir),
1683 .new_dir = NFS_FH(new_dir),
1684 .old_name = old_name,
1685 .new_name = new_name,
1686 };
1687 struct nfs4_rename_res res = { };
1688 struct rpc_message msg = {
1689 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1690 .rpc_argp = &arg,
1691 .rpc_resp = &res,
1692 };
1693 int status;
1694
1695 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1696
1697 if (!status) {
1698 update_changeattr(old_dir, &res.old_cinfo);
1699 update_changeattr(new_dir, &res.new_cinfo);
1700 }
1701 return status;
1702}
1703
1704static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1705 struct inode *new_dir, struct qstr *new_name)
1706{
1707 struct nfs4_exception exception = { };
1708 int err;
1709 do {
1710 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1711 _nfs4_proc_rename(old_dir, old_name,
1712 new_dir, new_name),
1713 &exception);
1714 } while (exception.retry);
1715 return err;
1716}
1717
1718static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1719{
1720 struct nfs4_link_arg arg = {
1721 .fh = NFS_FH(inode),
1722 .dir_fh = NFS_FH(dir),
1723 .name = name,
1724 };
1725 struct nfs4_change_info cinfo = { };
1726 struct rpc_message msg = {
1727 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1728 .rpc_argp = &arg,
1729 .rpc_resp = &cinfo,
1730 };
1731 int status;
1732
1733 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1734 if (!status)
1735 update_changeattr(dir, &cinfo);
1736
1737 return status;
1738}
1739
1740static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1741{
1742 struct nfs4_exception exception = { };
1743 int err;
1744 do {
1745 err = nfs4_handle_exception(NFS_SERVER(inode),
1746 _nfs4_proc_link(inode, dir, name),
1747 &exception);
1748 } while (exception.retry);
1749 return err;
1750}
1751
1752static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1753 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1754 struct nfs_fattr *fattr)
1755{
1756 struct nfs_server *server = NFS_SERVER(dir);
56ae19f3 1757 struct nfs_fattr dir_fattr;
1da177e4
LT		 1758 struct nfs4_create_arg arg = {
1759 .dir_fh = NFS_FH(dir),
1760 .server = server,
1761 .name = name,
1762 .attrs = sattr,
1763 .ftype = NF4LNK,
1764 .bitmask = server->attr_bitmask,
1765 };
1766 struct nfs4_create_res res = {
1767 .server = server,
1768 .fh = fhandle,
1769 .fattr = fattr,
56ae19f3 1770 .dir_fattr = &dir_fattr,
1da177e4
LT		 1771 };
1772 struct rpc_message msg = {
1773 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1774 .rpc_argp = &arg,
1775 .rpc_resp = &res,
1776 };
1777 int status;
1778
1779 if (path->len > NFS4_MAXPATHLEN)
1780 return -ENAMETOOLONG;
1781 arg.u.symlink = path;
0e574af1 1782 nfs_fattr_init(fattr);
56ae19f3 1783 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1784
1785 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1786 if (!status)
1787 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1788 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1789 return status;
1790}
1791
1792static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1793 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1794 struct nfs_fattr *fattr)
1795{
1796 struct nfs4_exception exception = { };
1797 int err;
1798 do {
1799 err = nfs4_handle_exception(NFS_SERVER(dir),
1800 _nfs4_proc_symlink(dir, name, path, sattr,
1801 fhandle, fattr),
1802 &exception);
1803 } while (exception.retry);
1804 return err;
1805}
1806
1807static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1808 struct iattr *sattr)
1809{
1810 struct nfs_server *server = NFS_SERVER(dir);
1811 struct nfs_fh fhandle;
56ae19f3 1812 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1813 struct nfs4_create_arg arg = {
1814 .dir_fh = NFS_FH(dir),
1815 .server = server,
1816 .name = &dentry->d_name,
1817 .attrs = sattr,
1818 .ftype = NF4DIR,
1819 .bitmask = server->attr_bitmask,
1820 };
1821 struct nfs4_create_res res = {
1822 .server = server,
1823 .fh = &fhandle,
1824 .fattr = &fattr,
56ae19f3 1825 .dir_fattr = &dir_fattr,
1da177e4
LT		 1826 };
1827 struct rpc_message msg = {
1828 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1829 .rpc_argp = &arg,
1830 .rpc_resp = &res,
1831 };
1832 int status;
1833
0e574af1 1834 nfs_fattr_init(&fattr);
56ae19f3 1835 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1836
1837 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1838 if (!status) {
1839 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1840 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1841 status = nfs_instantiate(dentry, &fhandle, &fattr);
1842 }
1843 return status;
1844}
1845
1846static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1847 struct iattr *sattr)
1848{
1849 struct nfs4_exception exception = { };
1850 int err;
1851 do {
1852 err = nfs4_handle_exception(NFS_SERVER(dir),
1853 _nfs4_proc_mkdir(dir, dentry, sattr),
1854 &exception);
1855 } while (exception.retry);
1856 return err;
1857}
1858
1859static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1860 u64 cookie, struct page *page, unsigned int count, int plus)
1861{
1862 struct inode *dir = dentry->d_inode;
1863 struct nfs4_readdir_arg args = {
1864 .fh = NFS_FH(dir),
1865 .pages = &page,
1866 .pgbase = 0,
1867 .count = count,
1868 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1869 };
1870 struct nfs4_readdir_res res;
1871 struct rpc_message msg = {
1872 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1873 .rpc_argp = &args,
1874 .rpc_resp = &res,
1875 .rpc_cred = cred,
1876 };
1877 int status;
1878
eadf4598
TM		 1879 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1880 dentry->d_parent->d_name.name,
1881 dentry->d_name.name,
1882 (unsigned long long)cookie);
1da177e4
LT		 1883 lock_kernel();
1884 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1885 res.pgbase = args.pgbase;
1886 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1887 if (status == 0)
1888 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1889 unlock_kernel();
eadf4598 1890 dprintk("%s: returns %d\n", __FUNCTION__, status);
1da177e4
LT		 1891 return status;
1892}
1893
1894static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1895 u64 cookie, struct page *page, unsigned int count, int plus)
1896{
1897 struct nfs4_exception exception = { };
1898 int err;
1899 do {
1900 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1901 _nfs4_proc_readdir(dentry, cred, cookie,
1902 page, count, plus),
1903 &exception);
1904 } while (exception.retry);
1905 return err;
1906}
1907
1908static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1909 struct iattr *sattr, dev_t rdev)
1910{
1911 struct nfs_server *server = NFS_SERVER(dir);
1912 struct nfs_fh fh;
56ae19f3 1913 struct nfs_fattr fattr, dir_fattr;
1da177e4
LT		 1914 struct nfs4_create_arg arg = {
1915 .dir_fh = NFS_FH(dir),
1916 .server = server,
1917 .name = &dentry->d_name,
1918 .attrs = sattr,
1919 .bitmask = server->attr_bitmask,
1920 };
1921 struct nfs4_create_res res = {
1922 .server = server,
1923 .fh = &fh,
1924 .fattr = &fattr,
56ae19f3 1925 .dir_fattr = &dir_fattr,
1da177e4
LT		 1926 };
1927 struct rpc_message msg = {
1928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1929 .rpc_argp = &arg,
1930 .rpc_resp = &res,
1931 };
1932 int status;
1933 int mode = sattr->ia_mode;
1934
0e574af1 1935 nfs_fattr_init(&fattr);
56ae19f3 1936 nfs_fattr_init(&dir_fattr);
1da177e4
LT		 1937
1938 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1939 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1940 if (S_ISFIFO(mode))
1941 arg.ftype = NF4FIFO;
1942 else if (S_ISBLK(mode)) {
1943 arg.ftype = NF4BLK;
1944 arg.u.device.specdata1 = MAJOR(rdev);
1945 arg.u.device.specdata2 = MINOR(rdev);
1946 }
1947 else if (S_ISCHR(mode)) {
1948 arg.ftype = NF4CHR;
1949 arg.u.device.specdata1 = MAJOR(rdev);
1950 arg.u.device.specdata2 = MINOR(rdev);
1951 }
1952 else
1953 arg.ftype = NF4SOCK;
1954
1955 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1956 if (status == 0) {
1957 update_changeattr(dir, &res.dir_cinfo);
56ae19f3 1958 nfs_post_op_update_inode(dir, res.dir_fattr);
1da177e4
LT		 1959 status = nfs_instantiate(dentry, &fh, &fattr);
1960 }
1961 return status;
1962}
1963
1964static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1965 struct iattr *sattr, dev_t rdev)
1966{
1967 struct nfs4_exception exception = { };
1968 int err;
1969 do {
1970 err = nfs4_handle_exception(NFS_SERVER(dir),
1971 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1972 &exception);
1973 } while (exception.retry);
1974 return err;
1975}
1976
1977static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1978 struct nfs_fsstat *fsstat)
1979{
1980 struct nfs4_statfs_arg args = {
1981 .fh = fhandle,
1982 .bitmask = server->attr_bitmask,
1983 };
1984 struct rpc_message msg = {
1985 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1986 .rpc_argp = &args,
1987 .rpc_resp = fsstat,
1988 };
1989
0e574af1 1990 nfs_fattr_init(fsstat->fattr);
1da177e4
LT		 1991 return rpc_call_sync(server->client, &msg, 0);
1992}
1993
1994static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1995{
1996 struct nfs4_exception exception = { };
1997 int err;
1998 do {
1999 err = nfs4_handle_exception(server,
2000 _nfs4_proc_statfs(server, fhandle, fsstat),
2001 &exception);
2002 } while (exception.retry);
2003 return err;
2004}
2005
2006static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2007 struct nfs_fsinfo *fsinfo)
2008{
2009 struct nfs4_fsinfo_arg args = {
2010 .fh = fhandle,
2011 .bitmask = server->attr_bitmask,
2012 };
2013 struct rpc_message msg = {
2014 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2015 .rpc_argp = &args,
2016 .rpc_resp = fsinfo,
2017 };
2018
2019 return rpc_call_sync(server->client, &msg, 0);
2020}
2021
2022static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2023{
2024 struct nfs4_exception exception = { };
2025 int err;
2026
2027 do {
2028 err = nfs4_handle_exception(server,
2029 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2030 &exception);
2031 } while (exception.retry);
2032 return err;
2033}
2034
2035static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2036{
0e574af1 2037 nfs_fattr_init(fsinfo->fattr);
1da177e4
LT		 2038 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2039}
2040
2041static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2042 struct nfs_pathconf *pathconf)
2043{
2044 struct nfs4_pathconf_arg args = {
2045 .fh = fhandle,
2046 .bitmask = server->attr_bitmask,
2047 };
2048 struct rpc_message msg = {
2049 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2050 .rpc_argp = &args,
2051 .rpc_resp = pathconf,
2052 };
2053
2054 /* None of the pathconf attributes are mandatory to implement */
2055 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2056 memset(pathconf, 0, sizeof(*pathconf));
2057 return 0;
2058 }
2059
0e574af1 2060 nfs_fattr_init(pathconf->fattr);
1da177e4
LT		 2061 return rpc_call_sync(server->client, &msg, 0);
2062}
2063
2064static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2065 struct nfs_pathconf *pathconf)
2066{
2067 struct nfs4_exception exception = { };
2068 int err;
2069
2070 do {
2071 err = nfs4_handle_exception(server,
2072 _nfs4_proc_pathconf(server, fhandle, pathconf),
2073 &exception);
2074 } while (exception.retry);
2075 return err;
2076}
2077
2078static void
2079nfs4_read_done(struct rpc_task *task)
2080{
2081 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2082 struct inode *inode = data->inode;
2083
2084 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2085 rpc_restart_call(task);
2086 return;
2087 }
2088 if (task->tk_status > 0)
2089 renew_lease(NFS_SERVER(inode), data->timestamp);
2090 /* Call back common NFS readpage processing */
2091 nfs_readpage_result(task);
2092}
2093
2094static void
2095nfs4_proc_read_setup(struct nfs_read_data *data)
2096{
2097 struct rpc_task *task = &data->task;
2098 struct rpc_message msg = {
2099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2100 .rpc_argp = &data->args,
2101 .rpc_resp = &data->res,
2102 .rpc_cred = data->cred,
2103 };
2104 struct inode *inode = data->inode;
2105 int flags;
2106
2107 data->timestamp = jiffies;
2108
2109 /* N.B. Do we need to test? Never called for swapfile inode */
2110 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2111
2112 /* Finalize the task. */
2113 rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2114 rpc_call_setup(task, &msg, 0);
2115}
2116
2117static void
2118nfs4_write_done(struct rpc_task *task)
2119{
2120 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2121 struct inode *inode = data->inode;
2122
2123 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2124 rpc_restart_call(task);
2125 return;
2126 }
2127 if (task->tk_status >= 0)
2128 renew_lease(NFS_SERVER(inode), data->timestamp);
2129 /* Call back common NFS writeback processing */
2130 nfs_writeback_done(task);
2131}
2132
2133static void
2134nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2135{
2136 struct rpc_task *task = &data->task;
2137 struct rpc_message msg = {
2138 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2139 .rpc_argp = &data->args,
2140 .rpc_resp = &data->res,
2141 .rpc_cred = data->cred,
2142 };
2143 struct inode *inode = data->inode;
2144 int stable;
2145 int flags;
2146
2147 if (how & FLUSH_STABLE) {
2148 if (!NFS_I(inode)->ncommit)
2149 stable = NFS_FILE_SYNC;
2150 else
2151 stable = NFS_DATA_SYNC;
2152 } else
2153 stable = NFS_UNSTABLE;
2154 data->args.stable = stable;
2155
2156 data->timestamp = jiffies;
2157
2158 /* Set the initial flags for the task. */
2159 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2160
2161 /* Finalize the task. */
2162 rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2163 rpc_call_setup(task, &msg, 0);
2164}
2165
2166static void
2167nfs4_commit_done(struct rpc_task *task)
2168{
2169 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2170 struct inode *inode = data->inode;
2171
2172 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2173 rpc_restart_call(task);
2174 return;
2175 }
2176 /* Call back common NFS writeback processing */
2177 nfs_commit_done(task);
2178}
2179
2180static void
2181nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2182{
2183 struct rpc_task *task = &data->task;
2184 struct rpc_message msg = {
2185 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2186 .rpc_argp = &data->args,
2187 .rpc_resp = &data->res,
2188 .rpc_cred = data->cred,
2189 };
2190 struct inode *inode = data->inode;
2191 int flags;
2192
2193 /* Set the initial flags for the task. */
2194 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2195
2196 /* Finalize the task. */
2197 rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2198 rpc_call_setup(task, &msg, 0);
2199}
2200
2201/*
2202 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2203 * standalone procedure for queueing an asynchronous RENEW.
2204 */
2205static void
2206renew_done(struct rpc_task *task)
2207{
2208 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2209 unsigned long timestamp = (unsigned long)task->tk_calldata;
2210
2211 if (task->tk_status < 0) {
2212 switch (task->tk_status) {
2213 case -NFS4ERR_STALE_CLIENTID:
2214 case -NFS4ERR_EXPIRED:
2215 case -NFS4ERR_CB_PATH_DOWN:
2216 nfs4_schedule_state_recovery(clp);
2217 }
2218 return;
2219 }
2220 spin_lock(&clp->cl_lock);
2221 if (time_before(clp->cl_last_renewal,timestamp))
2222 clp->cl_last_renewal = timestamp;
2223 spin_unlock(&clp->cl_lock);
2224}
2225
2226int
2227nfs4_proc_async_renew(struct nfs4_client *clp)
2228{
2229 struct rpc_message msg = {
2230 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2231 .rpc_argp = clp,
2232 .rpc_cred = clp->cl_cred,
2233 };
2234
2235 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2236 renew_done, (void *)jiffies);
2237}
2238
2239int
2240nfs4_proc_renew(struct nfs4_client *clp)
2241{
2242 struct rpc_message msg = {
2243 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2244 .rpc_argp = clp,
2245 .rpc_cred = clp->cl_cred,
2246 };
2247 unsigned long now = jiffies;
2248 int status;
2249
2250 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2251 if (status < 0)
2252 return status;
2253 spin_lock(&clp->cl_lock);
2254 if (time_before(clp->cl_last_renewal,now))
2255 clp->cl_last_renewal = now;
2256 spin_unlock(&clp->cl_lock);
2257 return 0;
2258}
2259
aa1870af
BF		 2260static inline int nfs4_server_supports_acls(struct nfs_server *server)
2261{
2262 return (server->caps & NFS_CAP_ACLS)
2263 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2264 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2265}
2266
2267/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2268 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2269 * the stack.
2270 */
2271#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2272
2273static void buf_to_pages(const void *buf, size_t buflen,
2274 struct page **pages, unsigned int *pgbase)
2275{
2276 const void *p = buf;
2277
2278 *pgbase = offset_in_page(buf);
2279 p -= *pgbase;
2280 while (p < buf + buflen) {
2281 *(pages++) = virt_to_page(p);
2282 p += PAGE_CACHE_SIZE;
2283 }
2284}
2285
e50a1c2e
BF		 2286struct nfs4_cached_acl {
2287 int cached;
2288 size_t len;
3e9d4154 2289 char data[0];
e50a1c2e
BF		 2290};
2291
2292static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2293{
2294 struct nfs_inode *nfsi = NFS_I(inode);
2295
2296 spin_lock(&inode->i_lock);
2297 kfree(nfsi->nfs4_acl);
2298 nfsi->nfs4_acl = acl;
2299 spin_unlock(&inode->i_lock);
2300}
2301
2302static void nfs4_zap_acl_attr(struct inode *inode)
2303{
2304 nfs4_set_cached_acl(inode, NULL);
2305}
2306
2307static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2308{
2309 struct nfs_inode *nfsi = NFS_I(inode);
2310 struct nfs4_cached_acl *acl;
2311 int ret = -ENOENT;
2312
2313 spin_lock(&inode->i_lock);
2314 acl = nfsi->nfs4_acl;
2315 if (acl == NULL)
2316 goto out;
2317 if (buf == NULL) /* user is just asking for length */
2318 goto out_len;
2319 if (acl->cached == 0)
2320 goto out;
2321 ret = -ERANGE; /* see getxattr(2) man page */
2322 if (acl->len > buflen)
2323 goto out;
2324 memcpy(buf, acl->data, acl->len);
2325out_len:
2326 ret = acl->len;
2327out:
2328 spin_unlock(&inode->i_lock);
2329 return ret;
2330}
2331
2332static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2333{
2334 struct nfs4_cached_acl *acl;
2335
2336 if (buf && acl_len <= PAGE_SIZE) {
2337 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2338 if (acl == NULL)
2339 goto out;
2340 acl->cached = 1;
2341 memcpy(acl->data, buf, acl_len);
2342 } else {
2343 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2344 if (acl == NULL)
2345 goto out;
2346 acl->cached = 0;
2347 }
2348 acl->len = acl_len;
2349out:
2350 nfs4_set_cached_acl(inode, acl);
2351}
2352
2353static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
aa1870af 2354{
aa1870af
BF		 2355 struct page *pages[NFS4ACL_MAXPAGES];
2356 struct nfs_getaclargs args = {
2357 .fh = NFS_FH(inode),
2358 .acl_pages = pages,
2359 .acl_len = buflen,
2360 };
2361 size_t resp_len = buflen;
e50a1c2e 2362 void *resp_buf;
aa1870af
BF		 2363 struct rpc_message msg = {
2364 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2365 .rpc_argp = &args,
2366 .rpc_resp = &resp_len,
2367 };
e50a1c2e 2368 struct page *localpage = NULL;
aa1870af
BF		 2369 int ret;
2370
e50a1c2e
BF		 2371 if (buflen < PAGE_SIZE) {
2372 /* As long as we're doing a round trip to the server anyway,
2373 * let's be prepared for a page of acl data. */
2374 localpage = alloc_page(GFP_KERNEL);
2375 resp_buf = page_address(localpage);
2376 if (localpage == NULL)
2377 return -ENOMEM;
2378 args.acl_pages[0] = localpage;
2379 args.acl_pgbase = 0;
1d95db8e 2380 resp_len = args.acl_len = PAGE_SIZE;
e50a1c2e
BF		 2381 } else {
2382 resp_buf = buf;
2383 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2384 }
aa1870af 2385 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
e50a1c2e
BF		 2386 if (ret)
2387 goto out_free;
2388 if (resp_len > args.acl_len)
2389 nfs4_write_cached_acl(inode, NULL, resp_len);
2390 else
2391 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2392 if (buf) {
2393 ret = -ERANGE;
2394 if (resp_len > buflen)
2395 goto out_free;
2396 if (localpage)
2397 memcpy(buf, resp_buf, resp_len);
2398 }
2399 ret = resp_len;
2400out_free:
2401 if (localpage)
2402 __free_page(localpage);
aa1870af
BF		 2403 return ret;
2404}
2405
e50a1c2e
BF		 2406static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2407{
2408 struct nfs_server *server = NFS_SERVER(inode);
2409 int ret;
2410
2411 if (!nfs4_server_supports_acls(server))
2412 return -EOPNOTSUPP;
2413 ret = nfs_revalidate_inode(server, inode);
2414 if (ret < 0)
2415 return ret;
2416 ret = nfs4_read_cached_acl(inode, buf, buflen);
2417 if (ret != -ENOENT)
2418 return ret;
2419 return nfs4_get_acl_uncached(inode, buf, buflen);
2420}
2421
4b580ee3
BF		 2422static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2423{
2424 struct nfs_server *server = NFS_SERVER(inode);
2425 struct page *pages[NFS4ACL_MAXPAGES];
2426 struct nfs_setaclargs arg = {
2427 .fh = NFS_FH(inode),
2428 .acl_pages = pages,
2429 .acl_len = buflen,
2430 };
2431 struct rpc_message msg = {
2432 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2433 .rpc_argp = &arg,
2434 .rpc_resp = NULL,
2435 };
2436 int ret;
2437
2438 if (!nfs4_server_supports_acls(server))
2439 return -EOPNOTSUPP;
642ac549 2440 nfs_inode_return_delegation(inode);
4b580ee3
BF		 2441 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2442 ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
e50a1c2e
BF		 2443 if (ret == 0)
2444 nfs4_write_cached_acl(inode, buf, buflen);
4b580ee3
BF		 2445 return ret;
2446}
2447
1da177e4 2448static int
faf5f49c 2449nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
1da177e4
LT		 2450{
2451 struct nfs4_client *clp = server->nfs4_state;
2452
2453 if (!clp || task->tk_status >= 0)
2454 return 0;
2455 switch(task->tk_status) {
2456 case -NFS4ERR_STALE_CLIENTID:
2457 case -NFS4ERR_STALE_STATEID:
2458 case -NFS4ERR_EXPIRED:
2459 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2460 nfs4_schedule_state_recovery(clp);
2461 if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2462 rpc_wake_up_task(task);
2463 task->tk_status = 0;
2464 return -EAGAIN;
2465 case -NFS4ERR_GRACE:
2466 case -NFS4ERR_DELAY:
2467 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2468 task->tk_status = 0;
2469 return -EAGAIN;
2470 case -NFS4ERR_OLD_STATEID:
2471 task->tk_status = 0;
2472 return -EAGAIN;
2473 }
2474 task->tk_status = nfs4_map_errors(task->tk_status);
2475 return 0;
2476}
2477
2478static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2479{
2480 DEFINE_WAIT(wait);
2481 sigset_t oldset;
2482 int interruptible, res = 0;
2483
2484 might_sleep();
2485
2486 rpc_clnt_sigmask(clnt, &oldset);
2487 interruptible = TASK_UNINTERRUPTIBLE;
2488 if (clnt->cl_intr)
2489 interruptible = TASK_INTERRUPTIBLE;
2490 prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2491 nfs4_schedule_state_recovery(clp);
2492 if (clnt->cl_intr && signalled())
2493 res = -ERESTARTSYS;
2494 else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2495 schedule();
2496 finish_wait(&clp->cl_waitq, &wait);
2497 rpc_clnt_sigunmask(clnt, &oldset);
2498 return res;
2499}
2500
2501static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2502{
2503 sigset_t oldset;
2504 int res = 0;
2505
2506 might_sleep();
2507
2508 if (*timeout <= 0)
2509 *timeout = NFS4_POLL_RETRY_MIN;
2510 if (*timeout > NFS4_POLL_RETRY_MAX)
2511 *timeout = NFS4_POLL_RETRY_MAX;
2512 rpc_clnt_sigmask(clnt, &oldset);
2513 if (clnt->cl_intr) {
041e0e3b 2514 schedule_timeout_interruptible(*timeout);
1da177e4
LT		 2515 if (signalled())
2516 res = -ERESTARTSYS;
041e0e3b
NA		 2517 } else
2518 schedule_timeout_uninterruptible(*timeout);
1da177e4
LT		 2519 rpc_clnt_sigunmask(clnt, &oldset);
2520 *timeout <<= 1;
2521 return res;
2522}
2523
2524/* This is the error handling routine for processes that are allowed
2525 * to sleep.
2526 */
faf5f49c 2527int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
1da177e4
LT		 2528{
2529 struct nfs4_client *clp = server->nfs4_state;
2530 int ret = errorcode;
2531
2532 exception->retry = 0;
2533 switch(errorcode) {
2534 case 0:
2535 return 0;
2536 case -NFS4ERR_STALE_CLIENTID:
2537 case -NFS4ERR_STALE_STATEID:
2538 case -NFS4ERR_EXPIRED:
2539 ret = nfs4_wait_clnt_recover(server->client, clp);
2540 if (ret == 0)
2541 exception->retry = 1;
2542 break;
2543 case -NFS4ERR_GRACE:
2544 case -NFS4ERR_DELAY:
2545 ret = nfs4_delay(server->client, &exception->timeout);
2546 if (ret == 0)
2547 exception->retry = 1;
2548 break;
2549 case -NFS4ERR_OLD_STATEID:
2550 if (ret == 0)
2551 exception->retry = 1;
2552 }
2553 /* We failed to handle the error */
2554 return nfs4_map_errors(ret);
2555}
2556
2557int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2558{
2559 nfs4_verifier sc_verifier;
2560 struct nfs4_setclientid setclientid = {
2561 .sc_verifier = &sc_verifier,
2562 .sc_prog = program,
2563 };
2564 struct rpc_message msg = {
2565 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2566 .rpc_argp = &setclientid,
2567 .rpc_resp = clp,
2568 .rpc_cred = clp->cl_cred,
2569 };
2570 u32 *p;
2571 int loop = 0;
2572 int status;
2573
2574 p = (u32*)sc_verifier.data;
2575 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2576 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2577
2578 for(;;) {
2579 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2580 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2581 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2582 clp->cl_cred->cr_ops->cr_name,
2583 clp->cl_id_uniquifier);
2584 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2585 sizeof(setclientid.sc_netid), "tcp");
2586 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2587 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2588 clp->cl_ipaddr, port >> 8, port & 255);
2589
2590 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2591 if (status != -NFS4ERR_CLID_INUSE)
2592 break;
2593 if (signalled())
2594 break;
2595 if (loop++ & 1)
2596 ssleep(clp->cl_lease_time + 1);
2597 else
2598 if (++clp->cl_id_uniquifier == 0)
2599 break;
2600 }
2601 return status;
2602}
2603
2604int
2605nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2606{
2607 struct nfs_fsinfo fsinfo;
2608 struct rpc_message msg = {
2609 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2610 .rpc_argp = clp,
2611 .rpc_resp = &fsinfo,
2612 .rpc_cred = clp->cl_cred,
2613 };
2614 unsigned long now;
2615 int status;
2616
2617 now = jiffies;
2618 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2619 if (status == 0) {
2620 spin_lock(&clp->cl_lock);
2621 clp->cl_lease_time = fsinfo.lease_time * HZ;
2622 clp->cl_last_renewal = now;
2623 spin_unlock(&clp->cl_lock);
2624 }
2625 return status;
2626}
2627
2628static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2629{
2630 struct nfs4_delegreturnargs args = {
2631 .fhandle = NFS_FH(inode),
2632 .stateid = stateid,
2633 };
2634 struct rpc_message msg = {
2635 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2636 .rpc_argp = &args,
2637 .rpc_cred = cred,
2638 };
2639
2640 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2641}
2642
2643int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2644{
2645 struct nfs_server *server = NFS_SERVER(inode);
2646 struct nfs4_exception exception = { };
2647 int err;
2648 do {
2649 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2650 switch (err) {
2651 case -NFS4ERR_STALE_STATEID:
2652 case -NFS4ERR_EXPIRED:
2653 nfs4_schedule_state_recovery(server->nfs4_state);
2654 case 0:
2655 return 0;
2656 }
2657 err = nfs4_handle_exception(server, err, &exception);
2658 } while (exception.retry);
2659 return err;
2660}
2661
2662#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2663#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2664
2665/*
2666 * sleep, with exponential backoff, and retry the LOCK operation.
2667 */
2668static unsigned long
2669nfs4_set_lock_task_retry(unsigned long timeout)
2670{
041e0e3b 2671 schedule_timeout_interruptible(timeout);
1da177e4
LT		 2672 timeout <<= 1;
2673 if (timeout > NFS4_LOCK_MAXTIMEOUT)
2674 return NFS4_LOCK_MAXTIMEOUT;
2675 return timeout;
2676}
2677
2678static inline int
2679nfs4_lck_type(int cmd, struct file_lock *request)
2680{
2681 /* set lock type */
2682 switch (request->fl_type) {
2683 case F_RDLCK:
2684 return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2685 case F_WRLCK:
2686 return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2687 case F_UNLCK:
2688 return NFS4_WRITE_LT;
2689 }
2690 BUG();
2691 return 0;
2692}
2693
2694static inline uint64_t
2695nfs4_lck_length(struct file_lock *request)
2696{
2697 if (request->fl_end == OFFSET_MAX)
2698 return ~(uint64_t)0;
2699 return request->fl_end - request->fl_start + 1;
2700}
2701
2702static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2703{
2704 struct inode *inode = state->inode;
2705 struct nfs_server *server = NFS_SERVER(inode);
2706 struct nfs4_client *clp = server->nfs4_state;
2707 struct nfs_lockargs arg = {
2708 .fh = NFS_FH(inode),
2709 .type = nfs4_lck_type(cmd, request),
2710 .offset = request->fl_start,
2711 .length = nfs4_lck_length(request),
2712 };
2713 struct nfs_lockres res = {
2714 .server = server,
2715 };
2716 struct rpc_message msg = {
2717 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2718 .rpc_argp = &arg,
2719 .rpc_resp = &res,
2720 .rpc_cred = state->owner->so_cred,
2721 };
2722 struct nfs_lowner nlo;
2723 struct nfs4_lock_state *lsp;
2724 int status;
2725
2726 down_read(&clp->cl_sem);
2727 nlo.clientid = clp->cl_clientid;
8d0a8a9d
TM		 2728 status = nfs4_set_lock_state(state, request);
2729 if (status != 0)
2730 goto out;
2731 lsp = request->fl_u.nfs4_fl.owner;
2732 nlo.id = lsp->ls_id;
1da177e4
LT		 2733 arg.u.lockt = &nlo;
2734 status = rpc_call_sync(server->client, &msg, 0);
2735 if (!status) {
2736 request->fl_type = F_UNLCK;
2737 } else if (status == -NFS4ERR_DENIED) {
2738 int64_t len, start, end;
2739 start = res.u.denied.offset;
2740 len = res.u.denied.length;
2741 end = start + len - 1;
2742 if (end < 0 || len == 0)
2743 request->fl_end = OFFSET_MAX;
2744 else
2745 request->fl_end = (loff_t)end;
2746 request->fl_start = (loff_t)start;
2747 request->fl_type = F_WRLCK;
2748 if (res.u.denied.type & 1)
2749 request->fl_type = F_RDLCK;
2750 request->fl_pid = 0;
2751 status = 0;
2752 }
8d0a8a9d 2753out:
1da177e4
LT		 2754 up_read(&clp->cl_sem);
2755 return status;
2756}
2757
2758static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2759{
2760 struct nfs4_exception exception = { };
2761 int err;
2762
2763 do {
2764 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2765 _nfs4_proc_getlk(state, cmd, request),
2766 &exception);
2767 } while (exception.retry);
2768 return err;
2769}
2770
2771static int do_vfs_lock(struct file *file, struct file_lock *fl)
2772{
2773 int res = 0;
2774 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2775 case FL_POSIX:
2776 res = posix_lock_file_wait(file, fl);
2777 break;
2778 case FL_FLOCK:
2779 res = flock_lock_file_wait(file, fl);
2780 break;
2781 default:
2782 BUG();
2783 }
2784 if (res < 0)
2785 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2786 __FUNCTION__);
2787 return res;
2788}
2789
faf5f49c
TM		 2790struct nfs4_unlockdata {
2791 struct nfs_lockargs arg;
2792 struct nfs_locku_opargs luargs;
2793 struct nfs_lockres res;
2794 struct nfs4_lock_state *lsp;
2795 struct nfs_open_context *ctx;
2796 atomic_t refcount;
2797 struct completion completion;
2798};
2799
2800static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
1da177e4 2801{
faf5f49c
TM		 2802 if (atomic_dec_and_test(&calldata->refcount)) {
2803 nfs_free_seqid(calldata->luargs.seqid);
2804 nfs4_put_lock_state(calldata->lsp);
2805 put_nfs_open_context(calldata->ctx);
2806 kfree(calldata);
2807 }
2808}
2809
2810static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2811{
2812 complete(&calldata->completion);
2813 nfs4_locku_release_calldata(calldata);
2814}
2815
2816static void nfs4_locku_done(struct rpc_task *task)
2817{
2818 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2819
2820 nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2821 switch (task->tk_status) {
2822 case 0:
2823 memcpy(calldata->lsp->ls_stateid.data,
2824 calldata->res.u.stateid.data,
2825 sizeof(calldata->lsp->ls_stateid.data));
2826 break;
2827 case -NFS4ERR_STALE_STATEID:
2828 case -NFS4ERR_EXPIRED:
2829 nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2830 break;
2831 default:
2832 if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2833 rpc_restart_call(task);
2834 return;
2835 }
2836 }
2837 nfs4_locku_complete(calldata);
2838}
2839
2840static void nfs4_locku_begin(struct rpc_task *task)
2841{
2842 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
1da177e4
LT		 2843 struct rpc_message msg = {
2844 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
faf5f49c
TM		 2845 .rpc_argp = &calldata->arg,
2846 .rpc_resp = &calldata->res,
2847 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
1da177e4 2848 };
faf5f49c
TM		 2849 int status;
2850
2851 status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2852 if (status != 0)
2853 return;
2854 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2855 nfs4_locku_complete(calldata);
2856 task->tk_exit = NULL;
2857 rpc_exit(task, 0);
2858 return;
2859 }
2860 rpc_call_setup(task, &msg, 0);
2861}
2862
2863static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2864{
2865 struct nfs4_unlockdata *calldata;
2866 struct inode *inode = state->inode;
2867 struct nfs_server *server = NFS_SERVER(inode);
1da177e4 2868 struct nfs4_lock_state *lsp;
8d0a8a9d 2869 int status;
faf5f49c 2870
8d0a8a9d
TM		 2871 status = nfs4_set_lock_state(state, request);
2872 if (status != 0)
faf5f49c 2873 return status;
8d0a8a9d 2874 lsp = request->fl_u.nfs4_fl.owner;
1da177e4 2875 /* We might have lost the locks! */
8d0a8a9d 2876 if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
faf5f49c
TM		 2877 return 0;
2878 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2879 if (calldata == NULL)
2880 return -ENOMEM;
2881 calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2882 if (calldata->luargs.seqid == NULL) {
2883 kfree(calldata);
2884 return -ENOMEM;
2885 }
2886 calldata->luargs.stateid = &lsp->ls_stateid;
2887 calldata->arg.fh = NFS_FH(inode);
2888 calldata->arg.type = nfs4_lck_type(cmd, request);
2889 calldata->arg.offset = request->fl_start;
2890 calldata->arg.length = nfs4_lck_length(request);
2891 calldata->arg.u.locku = &calldata->luargs;
2892 calldata->res.server = server;
2893 calldata->lsp = lsp;
2894 atomic_inc(&lsp->ls_count);
2895
2896 /* Ensure we don't close file until we're done freeing locks! */
2897 calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2898
2899 atomic_set(&calldata->refcount, 2);
2900 init_completion(&calldata->completion);
2901
2902 status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2903 nfs4_locku_done, calldata);
1da177e4 2904 if (status == 0)
faf5f49c
TM		 2905 wait_for_completion_interruptible(&calldata->completion);
2906 do_vfs_lock(request->fl_file, request);
2907 nfs4_locku_release_calldata(calldata);
1da177e4
LT		 2908 return status;
2909}
2910
1da177e4
LT		 2911static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2912{
2913 struct inode *inode = state->inode;
2914 struct nfs_server *server = NFS_SERVER(inode);
8d0a8a9d 2915 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
06735b34
TM		 2916 struct nfs_lock_opargs largs = {
2917 .lock_stateid = &lsp->ls_stateid,
2918 .open_stateid = &state->stateid,
2919 .lock_owner = {
2920 .clientid = server->nfs4_state->cl_clientid,
2921 .id = lsp->ls_id,
2922 },
2923 .reclaim = reclaim,
2924 };
1da177e4
LT		 2925 struct nfs_lockargs arg = {
2926 .fh = NFS_FH(inode),
2927 .type = nfs4_lck_type(cmd, request),
2928 .offset = request->fl_start,
2929 .length = nfs4_lck_length(request),
06735b34
TM		 2930 .u = {
2931 .lock = &largs,
2932 },
1da177e4
LT		 2933 };
2934 struct nfs_lockres res = {
2935 .server = server,
2936 };
2937 struct rpc_message msg = {
2938 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2939 .rpc_argp = &arg,
2940 .rpc_resp = &res,
2941 .rpc_cred = state->owner->so_cred,
2942 };
cee54fc9 2943 int status = -ENOMEM;
1da177e4 2944
06735b34
TM		 2945 largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2946 if (largs.lock_seqid == NULL)
cee54fc9
TM		 2947 return -ENOMEM;
2948 if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
1da177e4 2949 struct nfs4_state_owner *owner = state->owner;
06735b34
TM		 2950
2951 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2952 if (largs.open_seqid == NULL)
2953 goto out;
1da177e4 2954 largs.new_lock_owner = 1;
06735b34
TM		 2955 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2956 /* increment open seqid on success, and seqid mutating errors */
2957 if (largs.new_lock_owner != 0) {
2958 nfs_increment_open_seqid(status, largs.open_seqid);
2959 if (status == 0)
2960 nfs_confirm_seqid(&lsp->ls_seqid, 0);
8d0a8a9d 2961 }
06735b34
TM		 2962 nfs_free_seqid(largs.open_seqid);
2963 } else
1da177e4 2964 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
06735b34
TM		 2965 /* increment lock seqid on success, and seqid mutating errors*/
2966 nfs_increment_lock_seqid(status, largs.lock_seqid);
1da177e4 2967 /* save the returned stateid. */
cee54fc9 2968 if (status == 0) {
06735b34
TM		 2969 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2970 sizeof(lsp->ls_stateid.data));
cee54fc9
TM		 2971 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2972 } else if (status == -NFS4ERR_DENIED)
1da177e4 2973 status = -EAGAIN;
06735b34
TM		 2974out:
2975 nfs_free_seqid(largs.lock_seqid);
1da177e4
LT		 2976 return status;
2977}
2978
2979static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2980{
202b50dc
TM		 2981 struct nfs_server *server = NFS_SERVER(state->inode);
2982 struct nfs4_exception exception = { };
2983 int err;
2984
2985 do {
2986 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2987 if (err != -NFS4ERR_DELAY)
2988 break;
2989 nfs4_handle_exception(server, err, &exception);
2990 } while (exception.retry);
2991 return err;
1da177e4
LT		 2992}
2993
2994static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2995{
202b50dc
TM		 2996 struct nfs_server *server = NFS_SERVER(state->inode);
2997 struct nfs4_exception exception = { };
2998 int err;
2999
3000 do {
3001 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3002 if (err != -NFS4ERR_DELAY)
3003 break;
3004 nfs4_handle_exception(server, err, &exception);
3005 } while (exception.retry);
3006 return err;
1da177e4
LT		 3007}
3008
3009static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3010{
3011 struct nfs4_client *clp = state->owner->so_client;
3012 int status;
3013
3014 down_read(&clp->cl_sem);
8d0a8a9d
TM		 3015 status = nfs4_set_lock_state(state, request);
3016 if (status == 0)
3017 status = _nfs4_do_setlk(state, cmd, request, 0);
1da177e4
LT		 3018 if (status == 0) {
3019 /* Note: we always want to sleep here! */
3020 request->fl_flags |= FL_SLEEP;
3021 if (do_vfs_lock(request->fl_file, request) < 0)
3022 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3023 }
3024 up_read(&clp->cl_sem);
3025 return status;
3026}
3027
3028static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3029{
3030 struct nfs4_exception exception = { };
3031 int err;
3032
3033 do {
3034 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3035 _nfs4_proc_setlk(state, cmd, request),
3036 &exception);
3037 } while (exception.retry);
3038 return err;
3039}
3040
3041static int
3042nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3043{
3044 struct nfs_open_context *ctx;
3045 struct nfs4_state *state;
3046 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3047 int status;
3048
3049 /* verify open state */
3050 ctx = (struct nfs_open_context *)filp->private_data;
3051 state = ctx->state;
3052
3053 if (request->fl_start < 0 || request->fl_end < 0)
3054 return -EINVAL;
3055
3056 if (IS_GETLK(cmd))
3057 return nfs4_proc_getlk(state, F_GETLK, request);
3058
3059 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3060 return -EINVAL;
3061
3062 if (request->fl_type == F_UNLCK)
3063 return nfs4_proc_unlck(state, cmd, request);
3064
3065 do {
3066 status = nfs4_proc_setlk(state, cmd, request);
3067 if ((status != -EAGAIN) || IS_SETLK(cmd))
3068 break;
3069 timeout = nfs4_set_lock_task_retry(timeout);
3070 status = -ERESTARTSYS;
3071 if (signalled())
3072 break;
3073 } while(status < 0);
1da177e4
LT		 3074 return status;
3075}
3076
6b3b5496 3077
aa1870af
BF		 3078#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3079
6b3b5496
BF		 3080int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3081 size_t buflen, int flags)
3082{
4b580ee3
BF		 3083 struct inode *inode = dentry->d_inode;
3084
3085 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3086 return -EOPNOTSUPP;
3087
3088 if (!S_ISREG(inode->i_mode) &&
3089 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3090 return -EPERM;
3091
3092 return nfs4_proc_set_acl(inode, buf, buflen);
6b3b5496
BF		 3093}
3094
3095/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3096 * and that's what we'll do for e.g. user attributes that haven't been set.
3097 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3098 * attributes in kernel-managed attribute namespaces. */
3099ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3100 size_t buflen)
3101{
aa1870af
BF		 3102 struct inode *inode = dentry->d_inode;
3103
3104 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3105 return -EOPNOTSUPP;
3106
3107 return nfs4_proc_get_acl(inode, buf, buflen);
6b3b5496
BF		 3108}
3109
3110ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3111{
aa1870af 3112 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
6b3b5496
BF		 3113
3114 if (buf && buflen < len)
3115 return -ERANGE;
3116 if (buf)
aa1870af
BF		 3117 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3118 return len;
6b3b5496
BF		 3119}
3120
1da177e4
LT		 3121struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3122 .recover_open = nfs4_open_reclaim,
3123 .recover_lock = nfs4_lock_reclaim,
3124};
3125
3126struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3127 .recover_open = nfs4_open_expired,
3128 .recover_lock = nfs4_lock_expired,
3129};
3130
6b3b5496
BF		 3131static struct inode_operations nfs4_file_inode_operations = {
3132 .permission = nfs_permission,
3133 .getattr = nfs_getattr,
3134 .setattr = nfs_setattr,
3135 .getxattr = nfs4_getxattr,
3136 .setxattr = nfs4_setxattr,
3137 .listxattr = nfs4_listxattr,
3138};
3139
1da177e4
LT		 3140struct nfs_rpc_ops nfs_v4_clientops = {
3141 .version = 4, /* protocol version */
3142 .dentry_ops = &nfs4_dentry_operations,
3143 .dir_inode_ops = &nfs4_dir_inode_operations,
6b3b5496 3144 .file_inode_ops = &nfs4_file_inode_operations,
1da177e4
LT		 3145 .getroot = nfs4_proc_get_root,
3146 .getattr = nfs4_proc_getattr,
3147 .setattr = nfs4_proc_setattr,
3148 .lookup = nfs4_proc_lookup,
3149 .access = nfs4_proc_access,
3150 .readlink = nfs4_proc_readlink,
3151 .read = nfs4_proc_read,
3152 .write = nfs4_proc_write,
3153 .commit = nfs4_proc_commit,
3154 .create = nfs4_proc_create,
3155 .remove = nfs4_proc_remove,
3156 .unlink_setup = nfs4_proc_unlink_setup,
3157 .unlink_done = nfs4_proc_unlink_done,
3158 .rename = nfs4_proc_rename,
3159 .link = nfs4_proc_link,
3160 .symlink = nfs4_proc_symlink,
3161 .mkdir = nfs4_proc_mkdir,
3162 .rmdir = nfs4_proc_remove,
3163 .readdir = nfs4_proc_readdir,
3164 .mknod = nfs4_proc_mknod,
3165 .statfs = nfs4_proc_statfs,
3166 .fsinfo = nfs4_proc_fsinfo,
3167 .pathconf = nfs4_proc_pathconf,
3168 .decode_dirent = nfs4_decode_dirent,
3169 .read_setup = nfs4_proc_read_setup,
3170 .write_setup = nfs4_proc_write_setup,
3171 .commit_setup = nfs4_proc_commit_setup,
02a913a7
TM		 3172 .file_open = nfs_open,
3173 .file_release = nfs_release,
1da177e4 3174 .lock = nfs4_proc_lock,
e50a1c2e 3175 .clear_acl_cache = nfs4_zap_acl_attr,
1da177e4
LT		 3176};
3177
3178/*
3179 * Local variables:
3180 * c-basic-offset: 8
3181 * End:
3182 */
Linux 6.x block layer and io_uring tree(s)