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NFSv4: Check for the existence of a delegation in nfs4_open_prepare()
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/utsname.h>
40#include <linux/delay.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/sunrpc/clnt.h>
44#include <linux/nfs.h>
45#include <linux/nfs4.h>
46#include <linux/nfs_fs.h>
47#include <linux/nfs_page.h>
48#include <linux/smp_lock.h>
49#include <linux/namei.h>
50#include <linux/mount.h>
51
52#include "nfs4_fs.h"
53#include "delegation.h"
54#include "iostat.h"
55
56#define NFSDBG_FACILITY NFSDBG_PROC
57
58#define NFS4_POLL_RETRY_MIN (HZ/10)
59#define NFS4_POLL_RETRY_MAX (15*HZ)
60
61struct nfs4_opendata;
62static int _nfs4_proc_open(struct nfs4_opendata *data);
63static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
64static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
65static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
66static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
67static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
68static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
69
70/* Prevent leaks of NFSv4 errors into userland */
71int nfs4_map_errors(int err)
72{
73 if (err < -1000) {
74 dprintk("%s could not handle NFSv4 error %d\n",
75 __FUNCTION__, -err);
76 return -EIO;
77 }
78 return err;
79}
80
81/*
82 * This is our standard bitmap for GETATTR requests.
83 */
84const u32 nfs4_fattr_bitmap[2] = {
85 FATTR4_WORD0_TYPE
86 | FATTR4_WORD0_CHANGE
87 | FATTR4_WORD0_SIZE
88 | FATTR4_WORD0_FSID
89 | FATTR4_WORD0_FILEID,
90 FATTR4_WORD1_MODE
91 | FATTR4_WORD1_NUMLINKS
92 | FATTR4_WORD1_OWNER
93 | FATTR4_WORD1_OWNER_GROUP
94 | FATTR4_WORD1_RAWDEV
95 | FATTR4_WORD1_SPACE_USED
96 | FATTR4_WORD1_TIME_ACCESS
97 | FATTR4_WORD1_TIME_METADATA
98 | FATTR4_WORD1_TIME_MODIFY
99};
100
101const u32 nfs4_statfs_bitmap[2] = {
102 FATTR4_WORD0_FILES_AVAIL
103 | FATTR4_WORD0_FILES_FREE
104 | FATTR4_WORD0_FILES_TOTAL,
105 FATTR4_WORD1_SPACE_AVAIL
106 | FATTR4_WORD1_SPACE_FREE
107 | FATTR4_WORD1_SPACE_TOTAL
108};
109
110const u32 nfs4_pathconf_bitmap[2] = {
111 FATTR4_WORD0_MAXLINK
112 | FATTR4_WORD0_MAXNAME,
113 0
114};
115
116const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
117 | FATTR4_WORD0_MAXREAD
118 | FATTR4_WORD0_MAXWRITE
119 | FATTR4_WORD0_LEASE_TIME,
120 0
121};
122
123const u32 nfs4_fs_locations_bitmap[2] = {
124 FATTR4_WORD0_TYPE
125 | FATTR4_WORD0_CHANGE
126 | FATTR4_WORD0_SIZE
127 | FATTR4_WORD0_FSID
128 | FATTR4_WORD0_FILEID
129 | FATTR4_WORD0_FS_LOCATIONS,
130 FATTR4_WORD1_MODE
131 | FATTR4_WORD1_NUMLINKS
132 | FATTR4_WORD1_OWNER
133 | FATTR4_WORD1_OWNER_GROUP
134 | FATTR4_WORD1_RAWDEV
135 | FATTR4_WORD1_SPACE_USED
136 | FATTR4_WORD1_TIME_ACCESS
137 | FATTR4_WORD1_TIME_METADATA
138 | FATTR4_WORD1_TIME_MODIFY
139 | FATTR4_WORD1_MOUNTED_ON_FILEID
140};
141
142static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
143 struct nfs4_readdir_arg *readdir)
144{
145 __be32 *start, *p;
146
147 BUG_ON(readdir->count < 80);
148 if (cookie > 2) {
149 readdir->cookie = cookie;
150 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
151 return;
152 }
153
154 readdir->cookie = 0;
155 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
156 if (cookie == 2)
157 return;
158
159 /*
160 * NFSv4 servers do not return entries for '.' and '..'
161 * Therefore, we fake these entries here. We let '.'
162 * have cookie 0 and '..' have cookie 1. Note that
163 * when talking to the server, we always send cookie 0
164 * instead of 1 or 2.
165 */
166 start = p = kmap_atomic(*readdir->pages, KM_USER0);
167
168 if (cookie == 0) {
169 *p++ = xdr_one; /* next */
170 *p++ = xdr_zero; /* cookie, first word */
171 *p++ = xdr_one; /* cookie, second word */
172 *p++ = xdr_one; /* entry len */
173 memcpy(p, ".\0\0\0", 4); /* entry */
174 p++;
175 *p++ = xdr_one; /* bitmap length */
176 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
177 *p++ = htonl(8); /* attribute buffer length */
178 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
179 }
180
181 *p++ = xdr_one; /* next */
182 *p++ = xdr_zero; /* cookie, first word */
183 *p++ = xdr_two; /* cookie, second word */
184 *p++ = xdr_two; /* entry len */
185 memcpy(p, "..\0\0", 4); /* entry */
186 p++;
187 *p++ = xdr_one; /* bitmap length */
188 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
189 *p++ = htonl(8); /* attribute buffer length */
190 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
191
192 readdir->pgbase = (char *)p - (char *)start;
193 readdir->count -= readdir->pgbase;
194 kunmap_atomic(start, KM_USER0);
195}
196
197static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
198{
199 struct nfs_client *clp = server->nfs_client;
200 spin_lock(&clp->cl_lock);
201 if (time_before(clp->cl_last_renewal,timestamp))
202 clp->cl_last_renewal = timestamp;
203 spin_unlock(&clp->cl_lock);
204}
205
206static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
207{
208 struct nfs_inode *nfsi = NFS_I(dir);
209
210 spin_lock(&dir->i_lock);
211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
212 if (cinfo->before == nfsi->change_attr && cinfo->atomic)
213 nfsi->change_attr = cinfo->after;
214 spin_unlock(&dir->i_lock);
215}
216
217struct nfs4_opendata {
218 struct kref kref;
219 struct nfs_openargs o_arg;
220 struct nfs_openres o_res;
221 struct nfs_open_confirmargs c_arg;
222 struct nfs_open_confirmres c_res;
223 struct nfs_fattr f_attr;
224 struct nfs_fattr dir_attr;
225 struct path path;
226 struct dentry *dir;
227 struct nfs4_state_owner *owner;
228 struct nfs4_state *state;
229 struct iattr attrs;
230 unsigned long timestamp;
231 unsigned int rpc_done : 1;
232 int rpc_status;
233 int cancelled;
234};
235
236
237static void nfs4_init_opendata_res(struct nfs4_opendata *p)
238{
239 p->o_res.f_attr = &p->f_attr;
240 p->o_res.dir_attr = &p->dir_attr;
241 p->o_res.server = p->o_arg.server;
242 nfs_fattr_init(&p->f_attr);
243 nfs_fattr_init(&p->dir_attr);
244}
245
246static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
247 struct nfs4_state_owner *sp, int flags,
248 const struct iattr *attrs)
249{
250 struct dentry *parent = dget_parent(path->dentry);
251 struct inode *dir = parent->d_inode;
252 struct nfs_server *server = NFS_SERVER(dir);
253 struct nfs4_opendata *p;
254
255 p = kzalloc(sizeof(*p), GFP_KERNEL);
256 if (p == NULL)
257 goto err;
258 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
259 if (p->o_arg.seqid == NULL)
260 goto err_free;
261 p->path.mnt = mntget(path->mnt);
262 p->path.dentry = dget(path->dentry);
263 p->dir = parent;
264 p->owner = sp;
265 atomic_inc(&sp->so_count);
266 p->o_arg.fh = NFS_FH(dir);
267 p->o_arg.open_flags = flags,
268 p->o_arg.clientid = server->nfs_client->cl_clientid;
269 p->o_arg.id = sp->so_owner_id.id;
270 p->o_arg.name = &p->path.dentry->d_name;
271 p->o_arg.server = server;
272 p->o_arg.bitmask = server->attr_bitmask;
273 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
274 if (flags & O_EXCL) {
275 u32 *s = (u32 *) p->o_arg.u.verifier.data;
276 s[0] = jiffies;
277 s[1] = current->pid;
278 } else if (flags & O_CREAT) {
279 p->o_arg.u.attrs = &p->attrs;
280 memcpy(&p->attrs, attrs, sizeof(p->attrs));
281 }
282 p->c_arg.fh = &p->o_res.fh;
283 p->c_arg.stateid = &p->o_res.stateid;
284 p->c_arg.seqid = p->o_arg.seqid;
285 nfs4_init_opendata_res(p);
286 kref_init(&p->kref);
287 return p;
288err_free:
289 kfree(p);
290err:
291 dput(parent);
292 return NULL;
293}
294
295static void nfs4_opendata_free(struct kref *kref)
296{
297 struct nfs4_opendata *p = container_of(kref,
298 struct nfs4_opendata, kref);
299
300 nfs_free_seqid(p->o_arg.seqid);
301 if (p->state != NULL)
302 nfs4_put_open_state(p->state);
303 nfs4_put_state_owner(p->owner);
304 dput(p->dir);
305 dput(p->path.dentry);
306 mntput(p->path.mnt);
307 kfree(p);
308}
309
310static void nfs4_opendata_put(struct nfs4_opendata *p)
311{
312 if (p != NULL)
313 kref_put(&p->kref, nfs4_opendata_free);
314}
315
316static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
317{
318 sigset_t oldset;
319 int ret;
320
321 rpc_clnt_sigmask(task->tk_client, &oldset);
322 ret = rpc_wait_for_completion_task(task);
323 rpc_clnt_sigunmask(task->tk_client, &oldset);
324 return ret;
325}
326
327static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
328{
329 if ((delegation->type & open_flags) != open_flags)
330 return 0;
331 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
332 return 0;
333 return 1;
334}
335
336static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
337{
338 switch (open_flags) {
339 case FMODE_WRITE:
340 state->n_wronly++;
341 break;
342 case FMODE_READ:
343 state->n_rdonly++;
344 break;
345 case FMODE_READ|FMODE_WRITE:
346 state->n_rdwr++;
347 }
348 nfs4_state_set_mode_locked(state, state->state | open_flags);
349}
350
351static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
352{
353 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
354 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
355 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
356 switch (open_flags) {
357 case FMODE_READ:
358 set_bit(NFS_O_RDONLY_STATE, &state->flags);
359 break;
360 case FMODE_WRITE:
361 set_bit(NFS_O_WRONLY_STATE, &state->flags);
362 break;
363 case FMODE_READ|FMODE_WRITE:
364 set_bit(NFS_O_RDWR_STATE, &state->flags);
365 }
366}
367
368static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
369{
370 spin_lock(&state->owner->so_lock);
371 spin_lock(&state->inode->i_lock);
372 nfs_set_open_stateid_locked(state, stateid, open_flags);
373 spin_unlock(&state->inode->i_lock);
374 spin_unlock(&state->owner->so_lock);
375}
376
377static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
378{
379 struct inode *inode = state->inode;
380
381 open_flags &= (FMODE_READ|FMODE_WRITE);
382 /* Protect against nfs4_find_state_byowner() */
383 spin_lock(&state->owner->so_lock);
384 spin_lock(&inode->i_lock);
385 if (deleg_stateid != NULL) {
386 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
387 set_bit(NFS_DELEGATED_STATE, &state->flags);
388 }
389 if (open_stateid != NULL)
390 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
391 update_open_stateflags(state, open_flags);
392 spin_unlock(&inode->i_lock);
393 spin_unlock(&state->owner->so_lock);
394}
395
396static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
397{
398 struct nfs_delegation *delegation;
399
400 rcu_read_lock();
401 delegation = rcu_dereference(NFS_I(inode)->delegation);
402 if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
403 rcu_read_unlock();
404 return;
405 }
406 rcu_read_unlock();
407 nfs_inode_return_delegation(inode);
408}
409
410static struct nfs4_state *nfs4_try_open_delegated(struct nfs4_opendata *opendata)
411{
412 struct nfs4_state *state = opendata->state;
413 struct nfs_inode *nfsi = NFS_I(state->inode);
414 struct nfs_delegation *delegation;
415 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
416 nfs4_stateid stateid;
417 int ret = -EAGAIN;
418
419 rcu_read_lock();
420 delegation = rcu_dereference(nfsi->delegation);
421 if (delegation == NULL)
422 goto out_unlock;
423 for (;;) {
424 if (!can_open_delegated(delegation, open_mode))
425 break;
426 /* Save the delegation */
427 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
428 rcu_read_unlock();
429 lock_kernel();
430 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
431 unlock_kernel();
432 if (ret != 0)
433 goto out;
434 ret = -EAGAIN;
435 rcu_read_lock();
436 delegation = rcu_dereference(nfsi->delegation);
437 if (delegation == NULL)
438 break;
439 /* Is the delegation still valid? */
440 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
441 continue;
442 rcu_read_unlock();
443 update_open_stateid(state, NULL, &stateid, open_mode);
444 goto out_return_state;
445 }
446out_unlock:
447 rcu_read_unlock();
448out:
449 return ERR_PTR(ret);
450out_return_state:
451 atomic_inc(&state->count);
452 return state;
453}
454
455static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
456{
457 struct inode *inode;
458 struct nfs4_state *state = NULL;
459 struct nfs_delegation *delegation;
460 nfs4_stateid *deleg_stateid = NULL;
461 int ret;
462
463 if (!data->rpc_done) {
464 state = nfs4_try_open_delegated(data);
465 goto out;
466 }
467
468 ret = -EAGAIN;
469 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
470 goto err;
471 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
472 ret = PTR_ERR(inode);
473 if (IS_ERR(inode))
474 goto err;
475 ret = -ENOMEM;
476 state = nfs4_get_open_state(inode, data->owner);
477 if (state == NULL)
478 goto err_put_inode;
479 if (data->o_res.delegation_type != 0) {
480 int delegation_flags = 0;
481
482 rcu_read_lock();
483 delegation = rcu_dereference(NFS_I(inode)->delegation);
484 if (delegation)
485 delegation_flags = delegation->flags;
486 rcu_read_unlock();
487 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
488 nfs_inode_set_delegation(state->inode,
489 data->owner->so_cred,
490 &data->o_res);
491 else
492 nfs_inode_reclaim_delegation(state->inode,
493 data->owner->so_cred,
494 &data->o_res);
495 }
496 rcu_read_lock();
497 delegation = rcu_dereference(NFS_I(inode)->delegation);
498 if (delegation != NULL)
499 deleg_stateid = &delegation->stateid;
500 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
501 rcu_read_unlock();
502 iput(inode);
503out:
504 return state;
505err_put_inode:
506 iput(inode);
507err:
508 return ERR_PTR(ret);
509}
510
511static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
512{
513 struct nfs_inode *nfsi = NFS_I(state->inode);
514 struct nfs_open_context *ctx;
515
516 spin_lock(&state->inode->i_lock);
517 list_for_each_entry(ctx, &nfsi->open_files, list) {
518 if (ctx->state != state)
519 continue;
520 get_nfs_open_context(ctx);
521 spin_unlock(&state->inode->i_lock);
522 return ctx;
523 }
524 spin_unlock(&state->inode->i_lock);
525 return ERR_PTR(-ENOENT);
526}
527
528static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
529{
530 struct nfs4_state *newstate;
531 int ret;
532
533 opendata->o_arg.open_flags = openflags;
534 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
535 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
536 nfs4_init_opendata_res(opendata);
537 ret = _nfs4_proc_open(opendata);
538 if (ret != 0)
539 return ret;
540 newstate = nfs4_opendata_to_nfs4_state(opendata);
541 if (IS_ERR(newstate))
542 return PTR_ERR(newstate);
543 nfs4_close_state(&opendata->path, newstate, openflags);
544 *res = newstate;
545 return 0;
546}
547
548static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
549{
550 struct nfs4_state *newstate;
551 int ret;
552
553 /* memory barrier prior to reading state->n_* */
554 clear_bit(NFS_DELEGATED_STATE, &state->flags);
555 smp_rmb();
556 if (state->n_rdwr != 0) {
557 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
558 if (ret != 0)
559 return ret;
560 if (newstate != state)
561 return -ESTALE;
562 }
563 if (state->n_wronly != 0) {
564 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
565 if (ret != 0)
566 return ret;
567 if (newstate != state)
568 return -ESTALE;
569 }
570 if (state->n_rdonly != 0) {
571 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
572 if (ret != 0)
573 return ret;
574 if (newstate != state)
575 return -ESTALE;
576 }
577 return 0;
578}
579
580/*
581 * OPEN_RECLAIM:
582 * reclaim state on the server after a reboot.
583 */
584static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
585{
586 struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
587 struct nfs4_opendata *opendata;
588 int delegation_type = 0;
589 int status;
590
591 if (delegation != NULL) {
592 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
593 memcpy(&state->stateid, &delegation->stateid,
594 sizeof(state->stateid));
595 set_bit(NFS_DELEGATED_STATE, &state->flags);
596 return 0;
597 }
598 delegation_type = delegation->type;
599 }
600 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
601 if (opendata == NULL)
602 return -ENOMEM;
603 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
604 opendata->o_arg.fh = NFS_FH(state->inode);
605 nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
606 opendata->o_arg.u.delegation_type = delegation_type;
607 status = nfs4_open_recover(opendata, state);
608 nfs4_opendata_put(opendata);
609 return status;
610}
611
612static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
613{
614 struct nfs_server *server = NFS_SERVER(state->inode);
615 struct nfs4_exception exception = { };
616 int err;
617 do {
618 err = _nfs4_do_open_reclaim(ctx, state);
619 if (err != -NFS4ERR_DELAY)
620 break;
621 nfs4_handle_exception(server, err, &exception);
622 } while (exception.retry);
623 return err;
624}
625
626static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
627{
628 struct nfs_open_context *ctx;
629 int ret;
630
631 ctx = nfs4_state_find_open_context(state);
632 if (IS_ERR(ctx))
633 return PTR_ERR(ctx);
634 ret = nfs4_do_open_reclaim(ctx, state);
635 put_nfs_open_context(ctx);
636 return ret;
637}
638
639static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
640{
641 struct nfs4_state_owner *sp = state->owner;
642 struct nfs4_opendata *opendata;
643 int ret;
644
645 opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
646 if (opendata == NULL)
647 return -ENOMEM;
648 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
649 memcpy(opendata->o_arg.u.delegation.data, stateid->data,
650 sizeof(opendata->o_arg.u.delegation.data));
651 ret = nfs4_open_recover(opendata, state);
652 nfs4_opendata_put(opendata);
653 return ret;
654}
655
656int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
657{
658 struct nfs4_exception exception = { };
659 struct nfs_server *server = NFS_SERVER(state->inode);
660 int err;
661 do {
662 err = _nfs4_open_delegation_recall(ctx, state, stateid);
663 switch (err) {
664 case 0:
665 return err;
666 case -NFS4ERR_STALE_CLIENTID:
667 case -NFS4ERR_STALE_STATEID:
668 case -NFS4ERR_EXPIRED:
669 /* Don't recall a delegation if it was lost */
670 nfs4_schedule_state_recovery(server->nfs_client);
671 return err;
672 }
673 err = nfs4_handle_exception(server, err, &exception);
674 } while (exception.retry);
675 return err;
676}
677
678static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
679{
680 struct nfs4_opendata *data = calldata;
681 struct rpc_message msg = {
682 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
683 .rpc_argp = &data->c_arg,
684 .rpc_resp = &data->c_res,
685 .rpc_cred = data->owner->so_cred,
686 };
687 data->timestamp = jiffies;
688 rpc_call_setup(task, &msg, 0);
689}
690
691static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
692{
693 struct nfs4_opendata *data = calldata;
694
695 data->rpc_status = task->tk_status;
696 if (RPC_ASSASSINATED(task))
697 return;
698 if (data->rpc_status == 0) {
699 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
700 sizeof(data->o_res.stateid.data));
701 renew_lease(data->o_res.server, data->timestamp);
702 data->rpc_done = 1;
703 }
704 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
705 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
706}
707
708static void nfs4_open_confirm_release(void *calldata)
709{
710 struct nfs4_opendata *data = calldata;
711 struct nfs4_state *state = NULL;
712
713 /* If this request hasn't been cancelled, do nothing */
714 if (data->cancelled == 0)
715 goto out_free;
716 /* In case of error, no cleanup! */
717 if (!data->rpc_done)
718 goto out_free;
719 nfs_confirm_seqid(&data->owner->so_seqid, 0);
720 state = nfs4_opendata_to_nfs4_state(data);
721 if (!IS_ERR(state))
722 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
723out_free:
724 nfs4_opendata_put(data);
725}
726
727static const struct rpc_call_ops nfs4_open_confirm_ops = {
728 .rpc_call_prepare = nfs4_open_confirm_prepare,
729 .rpc_call_done = nfs4_open_confirm_done,
730 .rpc_release = nfs4_open_confirm_release,
731};
732
733/*
734 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
735 */
736static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
737{
738 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
739 struct rpc_task *task;
740 int status;
741
742 kref_get(&data->kref);
743 data->rpc_done = 0;
744 data->rpc_status = 0;
745 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
746 if (IS_ERR(task))
747 return PTR_ERR(task);
748 status = nfs4_wait_for_completion_rpc_task(task);
749 if (status != 0) {
750 data->cancelled = 1;
751 smp_wmb();
752 } else
753 status = data->rpc_status;
754 rpc_put_task(task);
755 return status;
756}
757
758static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
759{
760 struct nfs4_opendata *data = calldata;
761 struct nfs4_state_owner *sp = data->owner;
762 struct rpc_message msg = {
763 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
764 .rpc_argp = &data->o_arg,
765 .rpc_resp = &data->o_res,
766 .rpc_cred = sp->so_cred,
767 };
768
769 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
770 return;
771 /*
772 * Check if we still need to send an OPEN call, or if we can use
773 * a delegation instead.
774 */
775 if (data->state != NULL) {
776 struct nfs_delegation *delegation;
777
778 rcu_read_lock();
779 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
780 if (delegation != NULL &&
781 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
782 rcu_read_unlock();
783 task->tk_action = NULL;
784 return;
785 }
786 rcu_read_unlock();
787 }
788 /* Update sequence id. */
789 data->o_arg.id = sp->so_owner_id.id;
790 data->o_arg.clientid = sp->so_client->cl_clientid;
791 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
792 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
793 data->timestamp = jiffies;
794 rpc_call_setup(task, &msg, 0);
795}
796
797static void nfs4_open_done(struct rpc_task *task, void *calldata)
798{
799 struct nfs4_opendata *data = calldata;
800
801 data->rpc_status = task->tk_status;
802 if (RPC_ASSASSINATED(task))
803 return;
804 if (task->tk_status == 0) {
805 switch (data->o_res.f_attr->mode & S_IFMT) {
806 case S_IFREG:
807 break;
808 case S_IFLNK:
809 data->rpc_status = -ELOOP;
810 break;
811 case S_IFDIR:
812 data->rpc_status = -EISDIR;
813 break;
814 default:
815 data->rpc_status = -ENOTDIR;
816 }
817 renew_lease(data->o_res.server, data->timestamp);
818 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
819 nfs_confirm_seqid(&data->owner->so_seqid, 0);
820 }
821 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
822 data->rpc_done = 1;
823}
824
825static void nfs4_open_release(void *calldata)
826{
827 struct nfs4_opendata *data = calldata;
828 struct nfs4_state *state = NULL;
829
830 /* If this request hasn't been cancelled, do nothing */
831 if (data->cancelled == 0)
832 goto out_free;
833 /* In case of error, no cleanup! */
834 if (data->rpc_status != 0 || !data->rpc_done)
835 goto out_free;
836 /* In case we need an open_confirm, no cleanup! */
837 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
838 goto out_free;
839 nfs_confirm_seqid(&data->owner->so_seqid, 0);
840 state = nfs4_opendata_to_nfs4_state(data);
841 if (!IS_ERR(state))
842 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
843out_free:
844 nfs4_opendata_put(data);
845}
846
847static const struct rpc_call_ops nfs4_open_ops = {
848 .rpc_call_prepare = nfs4_open_prepare,
849 .rpc_call_done = nfs4_open_done,
850 .rpc_release = nfs4_open_release,
851};
852
853/*
854 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
855 */
856static int _nfs4_proc_open(struct nfs4_opendata *data)
857{
858 struct inode *dir = data->dir->d_inode;
859 struct nfs_server *server = NFS_SERVER(dir);
860 struct nfs_openargs *o_arg = &data->o_arg;
861 struct nfs_openres *o_res = &data->o_res;
862 struct rpc_task *task;
863 int status;
864
865 kref_get(&data->kref);
866 data->rpc_done = 0;
867 data->rpc_status = 0;
868 data->cancelled = 0;
869 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
870 if (IS_ERR(task))
871 return PTR_ERR(task);
872 status = nfs4_wait_for_completion_rpc_task(task);
873 if (status != 0) {
874 data->cancelled = 1;
875 smp_wmb();
876 } else
877 status = data->rpc_status;
878 rpc_put_task(task);
879 if (status != 0 || !data->rpc_done)
880 return status;
881
882 if (o_arg->open_flags & O_CREAT) {
883 update_changeattr(dir, &o_res->cinfo);
884 nfs_post_op_update_inode(dir, o_res->dir_attr);
885 } else
886 nfs_refresh_inode(dir, o_res->dir_attr);
887 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
888 status = _nfs4_proc_open_confirm(data);
889 if (status != 0)
890 return status;
891 }
892 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
893 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
894 return 0;
895}
896
897static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
898{
899 struct nfs_access_entry cache;
900 int mask = 0;
901 int status;
902
903 if (openflags & FMODE_READ)
904 mask |= MAY_READ;
905 if (openflags & FMODE_WRITE)
906 mask |= MAY_WRITE;
907 if (openflags & FMODE_EXEC)
908 mask |= MAY_EXEC;
909 status = nfs_access_get_cached(inode, cred, &cache);
910 if (status == 0)
911 goto out;
912
913 /* Be clever: ask server to check for all possible rights */
914 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
915 cache.cred = cred;
916 cache.jiffies = jiffies;
917 status = _nfs4_proc_access(inode, &cache);
918 if (status != 0)
919 return status;
920 nfs_access_add_cache(inode, &cache);
921out:
922 if ((cache.mask & mask) == mask)
923 return 0;
924 return -EACCES;
925}
926
927static int nfs4_recover_expired_lease(struct nfs_server *server)
928{
929 struct nfs_client *clp = server->nfs_client;
930 int ret;
931
932 for (;;) {
933 ret = nfs4_wait_clnt_recover(server->client, clp);
934 if (ret != 0)
935 return ret;
936 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
937 break;
938 nfs4_schedule_state_recovery(clp);
939 }
940 return 0;
941}
942
943/*
944 * OPEN_EXPIRED:
945 * reclaim state on the server after a network partition.
946 * Assumes caller holds the appropriate lock
947 */
948static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
949{
950 struct inode *inode = state->inode;
951 struct nfs_delegation *delegation = NFS_I(inode)->delegation;
952 struct nfs4_opendata *opendata;
953 int openflags = state->state & (FMODE_READ|FMODE_WRITE);
954 int ret;
955
956 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
957 ret = _nfs4_do_access(inode, ctx->cred, openflags);
958 if (ret < 0)
959 return ret;
960 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
961 set_bit(NFS_DELEGATED_STATE, &state->flags);
962 return 0;
963 }
964 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, openflags, NULL);
965 if (opendata == NULL)
966 return -ENOMEM;
967 ret = nfs4_open_recover(opendata, state);
968 if (ret == -ESTALE) {
969 /* Invalidate the state owner so we don't ever use it again */
970 nfs4_drop_state_owner(state->owner);
971 d_drop(ctx->path.dentry);
972 }
973 nfs4_opendata_put(opendata);
974 return ret;
975}
976
977static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
978{
979 struct nfs_server *server = NFS_SERVER(state->inode);
980 struct nfs4_exception exception = { };
981 int err;
982
983 do {
984 err = _nfs4_open_expired(ctx, state);
985 if (err == -NFS4ERR_DELAY)
986 nfs4_handle_exception(server, err, &exception);
987 } while (exception.retry);
988 return err;
989}
990
991static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
992{
993 struct nfs_open_context *ctx;
994 int ret;
995
996 ctx = nfs4_state_find_open_context(state);
997 if (IS_ERR(ctx))
998 return PTR_ERR(ctx);
999 ret = nfs4_do_open_expired(ctx, state);
1000 put_nfs_open_context(ctx);
1001 return ret;
1002}
1003
1004/*
1005 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1006 * fields corresponding to attributes that were used to store the verifier.
1007 * Make sure we clobber those fields in the later setattr call
1008 */
1009static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1010{
1011 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1012 !(sattr->ia_valid & ATTR_ATIME_SET))
1013 sattr->ia_valid |= ATTR_ATIME;
1014
1015 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1016 !(sattr->ia_valid & ATTR_MTIME_SET))
1017 sattr->ia_valid |= ATTR_MTIME;
1018}
1019
1020/*
1021 * Returns a referenced nfs4_state
1022 */
1023static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1024{
1025 struct nfs4_state_owner *sp;
1026 struct nfs4_state *state = NULL;
1027 struct nfs_server *server = NFS_SERVER(dir);
1028 struct nfs_client *clp = server->nfs_client;
1029 struct nfs4_opendata *opendata;
1030 int status;
1031
1032 /* Protect against reboot recovery conflicts */
1033 status = -ENOMEM;
1034 if (!(sp = nfs4_get_state_owner(server, cred))) {
1035 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1036 goto out_err;
1037 }
1038 status = nfs4_recover_expired_lease(server);
1039 if (status != 0)
1040 goto err_put_state_owner;
1041 if (path->dentry->d_inode != NULL)
1042 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1043 down_read(&clp->cl_sem);
1044 status = -ENOMEM;
1045 opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1046 if (opendata == NULL)
1047 goto err_release_rwsem;
1048
1049 if (path->dentry->d_inode != NULL)
1050 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1051
1052 status = _nfs4_proc_open(opendata);
1053 if (status != 0)
1054 goto err_opendata_put;
1055
1056 if (opendata->o_arg.open_flags & O_EXCL)
1057 nfs4_exclusive_attrset(opendata, sattr);
1058
1059 state = nfs4_opendata_to_nfs4_state(opendata);
1060 status = PTR_ERR(state);
1061 if (IS_ERR(state))
1062 goto err_opendata_put;
1063 nfs4_opendata_put(opendata);
1064 nfs4_put_state_owner(sp);
1065 up_read(&clp->cl_sem);
1066 *res = state;
1067 return 0;
1068err_opendata_put:
1069 nfs4_opendata_put(opendata);
1070err_release_rwsem:
1071 up_read(&clp->cl_sem);
1072err_put_state_owner:
1073 nfs4_put_state_owner(sp);
1074out_err:
1075 *res = NULL;
1076 return status;
1077}
1078
1079
1080static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1081{
1082 struct nfs4_exception exception = { };
1083 struct nfs4_state *res;
1084 int status;
1085
1086 do {
1087 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1088 if (status == 0)
1089 break;
1090 /* NOTE: BAD_SEQID means the server and client disagree about the
1091 * book-keeping w.r.t. state-changing operations
1092 * (OPEN/CLOSE/LOCK/LOCKU...)
1093 * It is actually a sign of a bug on the client or on the server.
1094 *
1095 * If we receive a BAD_SEQID error in the particular case of
1096 * doing an OPEN, we assume that nfs_increment_open_seqid() will
1097 * have unhashed the old state_owner for us, and that we can
1098 * therefore safely retry using a new one. We should still warn
1099 * the user though...
1100 */
1101 if (status == -NFS4ERR_BAD_SEQID) {
1102 printk(KERN_WARNING "NFS: v4 server %s "
1103 " returned a bad sequence-id error!\n",
1104 NFS_SERVER(dir)->nfs_client->cl_hostname);
1105 exception.retry = 1;
1106 continue;
1107 }
1108 /*
1109 * BAD_STATEID on OPEN means that the server cancelled our
1110 * state before it received the OPEN_CONFIRM.
1111 * Recover by retrying the request as per the discussion
1112 * on Page 181 of RFC3530.
1113 */
1114 if (status == -NFS4ERR_BAD_STATEID) {
1115 exception.retry = 1;
1116 continue;
1117 }
1118 if (status == -EAGAIN) {
1119 /* We must have found a delegation */
1120 exception.retry = 1;
1121 continue;
1122 }
1123 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1124 status, &exception));
1125 } while (exception.retry);
1126 return res;
1127}
1128
1129static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1130 struct iattr *sattr, struct nfs4_state *state)
1131{
1132 struct nfs_server *server = NFS_SERVER(inode);
1133 struct nfs_setattrargs arg = {
1134 .fh = NFS_FH(inode),
1135 .iap = sattr,
1136 .server = server,
1137 .bitmask = server->attr_bitmask,
1138 };
1139 struct nfs_setattrres res = {
1140 .fattr = fattr,
1141 .server = server,
1142 };
1143 struct rpc_message msg = {
1144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1145 .rpc_argp = &arg,
1146 .rpc_resp = &res,
1147 };
1148 unsigned long timestamp = jiffies;
1149 int status;
1150
1151 nfs_fattr_init(fattr);
1152
1153 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1154 /* Use that stateid */
1155 } else if (state != NULL) {
1156 msg.rpc_cred = state->owner->so_cred;
1157 nfs4_copy_stateid(&arg.stateid, state, current->files);
1158 } else
1159 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1160
1161 status = rpc_call_sync(server->client, &msg, 0);
1162 if (status == 0 && state != NULL)
1163 renew_lease(server, timestamp);
1164 return status;
1165}
1166
1167static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1168 struct iattr *sattr, struct nfs4_state *state)
1169{
1170 struct nfs_server *server = NFS_SERVER(inode);
1171 struct nfs4_exception exception = { };
1172 int err;
1173 do {
1174 err = nfs4_handle_exception(server,
1175 _nfs4_do_setattr(inode, fattr, sattr, state),
1176 &exception);
1177 } while (exception.retry);
1178 return err;
1179}
1180
1181struct nfs4_closedata {
1182 struct path path;
1183 struct inode *inode;
1184 struct nfs4_state *state;
1185 struct nfs_closeargs arg;
1186 struct nfs_closeres res;
1187 struct nfs_fattr fattr;
1188 unsigned long timestamp;
1189};
1190
1191static void nfs4_free_closedata(void *data)
1192{
1193 struct nfs4_closedata *calldata = data;
1194 struct nfs4_state_owner *sp = calldata->state->owner;
1195
1196 nfs4_put_open_state(calldata->state);
1197 nfs_free_seqid(calldata->arg.seqid);
1198 nfs4_put_state_owner(sp);
1199 dput(calldata->path.dentry);
1200 mntput(calldata->path.mnt);
1201 kfree(calldata);
1202}
1203
1204static void nfs4_close_done(struct rpc_task *task, void *data)
1205{
1206 struct nfs4_closedata *calldata = data;
1207 struct nfs4_state *state = calldata->state;
1208 struct nfs_server *server = NFS_SERVER(calldata->inode);
1209
1210 if (RPC_ASSASSINATED(task))
1211 return;
1212 /* hmm. we are done with the inode, and in the process of freeing
1213 * the state_owner. we keep this around to process errors
1214 */
1215 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1216 switch (task->tk_status) {
1217 case 0:
1218 nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
1219 renew_lease(server, calldata->timestamp);
1220 break;
1221 case -NFS4ERR_STALE_STATEID:
1222 case -NFS4ERR_EXPIRED:
1223 break;
1224 default:
1225 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1226 rpc_restart_call(task);
1227 return;
1228 }
1229 }
1230 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1231}
1232
1233static void nfs4_close_prepare(struct rpc_task *task, void *data)
1234{
1235 struct nfs4_closedata *calldata = data;
1236 struct nfs4_state *state = calldata->state;
1237 struct rpc_message msg = {
1238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1239 .rpc_argp = &calldata->arg,
1240 .rpc_resp = &calldata->res,
1241 .rpc_cred = state->owner->so_cred,
1242 };
1243 int clear_rd, clear_wr, clear_rdwr;
1244 int mode;
1245
1246 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1247 return;
1248
1249 mode = FMODE_READ|FMODE_WRITE;
1250 clear_rd = clear_wr = clear_rdwr = 0;
1251 spin_lock(&state->owner->so_lock);
1252 spin_lock(&calldata->inode->i_lock);
1253 /* Calculate the change in open mode */
1254 if (state->n_rdwr == 0) {
1255 if (state->n_rdonly == 0) {
1256 mode &= ~FMODE_READ;
1257 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1258 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1259 }
1260 if (state->n_wronly == 0) {
1261 mode &= ~FMODE_WRITE;
1262 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1263 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1264 }
1265 }
1266 spin_unlock(&calldata->inode->i_lock);
1267 spin_unlock(&state->owner->so_lock);
1268 if (!clear_rd && !clear_wr && !clear_rdwr) {
1269 /* Note: exit _without_ calling nfs4_close_done */
1270 task->tk_action = NULL;
1271 return;
1272 }
1273 nfs_fattr_init(calldata->res.fattr);
1274 if (mode != 0)
1275 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1276 calldata->arg.open_flags = mode;
1277 calldata->timestamp = jiffies;
1278 rpc_call_setup(task, &msg, 0);
1279}
1280
1281static const struct rpc_call_ops nfs4_close_ops = {
1282 .rpc_call_prepare = nfs4_close_prepare,
1283 .rpc_call_done = nfs4_close_done,
1284 .rpc_release = nfs4_free_closedata,
1285};
1286
1287/*
1288 * It is possible for data to be read/written from a mem-mapped file
1289 * after the sys_close call (which hits the vfs layer as a flush).
1290 * This means that we can't safely call nfsv4 close on a file until
1291 * the inode is cleared. This in turn means that we are not good
1292 * NFSv4 citizens - we do not indicate to the server to update the file's
1293 * share state even when we are done with one of the three share
1294 * stateid's in the inode.
1295 *
1296 * NOTE: Caller must be holding the sp->so_owner semaphore!
1297 */
1298int nfs4_do_close(struct path *path, struct nfs4_state *state)
1299{
1300 struct nfs_server *server = NFS_SERVER(state->inode);
1301 struct nfs4_closedata *calldata;
1302 struct nfs4_state_owner *sp = state->owner;
1303 struct rpc_task *task;
1304 int status = -ENOMEM;
1305
1306 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1307 if (calldata == NULL)
1308 goto out;
1309 calldata->inode = state->inode;
1310 calldata->state = state;
1311 calldata->arg.fh = NFS_FH(state->inode);
1312 calldata->arg.stateid = &state->open_stateid;
1313 /* Serialization for the sequence id */
1314 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1315 if (calldata->arg.seqid == NULL)
1316 goto out_free_calldata;
1317 calldata->arg.bitmask = server->attr_bitmask;
1318 calldata->res.fattr = &calldata->fattr;
1319 calldata->res.server = server;
1320 calldata->path.mnt = mntget(path->mnt);
1321 calldata->path.dentry = dget(path->dentry);
1322
1323 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1324 if (IS_ERR(task))
1325 return PTR_ERR(task);
1326 rpc_put_task(task);
1327 return 0;
1328out_free_calldata:
1329 kfree(calldata);
1330out:
1331 nfs4_put_open_state(state);
1332 nfs4_put_state_owner(sp);
1333 return status;
1334}
1335
1336static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1337{
1338 struct file *filp;
1339 int ret;
1340
1341 /* If the open_intent is for execute, we have an extra check to make */
1342 if (nd->intent.open.flags & FMODE_EXEC) {
1343 ret = _nfs4_do_access(state->inode,
1344 state->owner->so_cred,
1345 nd->intent.open.flags);
1346 if (ret < 0)
1347 goto out_close;
1348 }
1349 filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1350 if (!IS_ERR(filp)) {
1351 struct nfs_open_context *ctx;
1352 ctx = (struct nfs_open_context *)filp->private_data;
1353 ctx->state = state;
1354 return 0;
1355 }
1356 ret = PTR_ERR(filp);
1357out_close:
1358 nfs4_close_state(path, state, nd->intent.open.flags);
1359 return ret;
1360}
1361
1362struct dentry *
1363nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1364{
1365 struct path path = {
1366 .mnt = nd->mnt,
1367 .dentry = dentry,
1368 };
1369 struct iattr attr;
1370 struct rpc_cred *cred;
1371 struct nfs4_state *state;
1372 struct dentry *res;
1373
1374 if (nd->flags & LOOKUP_CREATE) {
1375 attr.ia_mode = nd->intent.open.create_mode;
1376 attr.ia_valid = ATTR_MODE;
1377 if (!IS_POSIXACL(dir))
1378 attr.ia_mode &= ~current->fs->umask;
1379 } else {
1380 attr.ia_valid = 0;
1381 BUG_ON(nd->intent.open.flags & O_CREAT);
1382 }
1383
1384 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1385 if (IS_ERR(cred))
1386 return (struct dentry *)cred;
1387 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1388 put_rpccred(cred);
1389 if (IS_ERR(state)) {
1390 if (PTR_ERR(state) == -ENOENT)
1391 d_add(dentry, NULL);
1392 return (struct dentry *)state;
1393 }
1394 res = d_add_unique(dentry, igrab(state->inode));
1395 if (res != NULL)
1396 dentry = res;
1397 nfs4_intent_set_file(nd, &path, state);
1398 return res;
1399}
1400
1401int
1402nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1403{
1404 struct path path = {
1405 .mnt = nd->mnt,
1406 .dentry = dentry,
1407 };
1408 struct rpc_cred *cred;
1409 struct nfs4_state *state;
1410
1411 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1412 if (IS_ERR(cred))
1413 return PTR_ERR(cred);
1414 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1415 put_rpccred(cred);
1416 if (IS_ERR(state)) {
1417 switch (PTR_ERR(state)) {
1418 case -EPERM:
1419 case -EACCES:
1420 case -EDQUOT:
1421 case -ENOSPC:
1422 case -EROFS:
1423 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1424 return 1;
1425 default:
1426 goto out_drop;
1427 }
1428 }
1429 if (state->inode == dentry->d_inode) {
1430 nfs4_intent_set_file(nd, &path, state);
1431 return 1;
1432 }
1433 nfs4_close_state(&path, state, openflags);
1434out_drop:
1435 d_drop(dentry);
1436 return 0;
1437}
1438
1439
1440static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1441{
1442 struct nfs4_server_caps_res res = {};
1443 struct rpc_message msg = {
1444 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1445 .rpc_argp = fhandle,
1446 .rpc_resp = &res,
1447 };
1448 int status;
1449
1450 status = rpc_call_sync(server->client, &msg, 0);
1451 if (status == 0) {
1452 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1453 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1454 server->caps |= NFS_CAP_ACLS;
1455 if (res.has_links != 0)
1456 server->caps |= NFS_CAP_HARDLINKS;
1457 if (res.has_symlinks != 0)
1458 server->caps |= NFS_CAP_SYMLINKS;
1459 server->acl_bitmask = res.acl_bitmask;
1460 }
1461 return status;
1462}
1463
1464int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1465{
1466 struct nfs4_exception exception = { };
1467 int err;
1468 do {
1469 err = nfs4_handle_exception(server,
1470 _nfs4_server_capabilities(server, fhandle),
1471 &exception);
1472 } while (exception.retry);
1473 return err;
1474}
1475
1476static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1477 struct nfs_fsinfo *info)
1478{
1479 struct nfs4_lookup_root_arg args = {
1480 .bitmask = nfs4_fattr_bitmap,
1481 };
1482 struct nfs4_lookup_res res = {
1483 .server = server,
1484 .fattr = info->fattr,
1485 .fh = fhandle,
1486 };
1487 struct rpc_message msg = {
1488 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1489 .rpc_argp = &args,
1490 .rpc_resp = &res,
1491 };
1492 nfs_fattr_init(info->fattr);
1493 return rpc_call_sync(server->client, &msg, 0);
1494}
1495
1496static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1497 struct nfs_fsinfo *info)
1498{
1499 struct nfs4_exception exception = { };
1500 int err;
1501 do {
1502 err = nfs4_handle_exception(server,
1503 _nfs4_lookup_root(server, fhandle, info),
1504 &exception);
1505 } while (exception.retry);
1506 return err;
1507}
1508
1509/*
1510 * get the file handle for the "/" directory on the server
1511 */
1512static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1513 struct nfs_fsinfo *info)
1514{
1515 int status;
1516
1517 status = nfs4_lookup_root(server, fhandle, info);
1518 if (status == 0)
1519 status = nfs4_server_capabilities(server, fhandle);
1520 if (status == 0)
1521 status = nfs4_do_fsinfo(server, fhandle, info);
1522 return nfs4_map_errors(status);
1523}
1524
1525/*
1526 * Get locations and (maybe) other attributes of a referral.
1527 * Note that we'll actually follow the referral later when
1528 * we detect fsid mismatch in inode revalidation
1529 */
1530static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1531{
1532 int status = -ENOMEM;
1533 struct page *page = NULL;
1534 struct nfs4_fs_locations *locations = NULL;
1535
1536 page = alloc_page(GFP_KERNEL);
1537 if (page == NULL)
1538 goto out;
1539 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1540 if (locations == NULL)
1541 goto out;
1542
1543 status = nfs4_proc_fs_locations(dir, name, locations, page);
1544 if (status != 0)
1545 goto out;
1546 /* Make sure server returned a different fsid for the referral */
1547 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1548 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1549 status = -EIO;
1550 goto out;
1551 }
1552
1553 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1554 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1555 if (!fattr->mode)
1556 fattr->mode = S_IFDIR;
1557 memset(fhandle, 0, sizeof(struct nfs_fh));
1558out:
1559 if (page)
1560 __free_page(page);
1561 if (locations)
1562 kfree(locations);
1563 return status;
1564}
1565
1566static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1567{
1568 struct nfs4_getattr_arg args = {
1569 .fh = fhandle,
1570 .bitmask = server->attr_bitmask,
1571 };
1572 struct nfs4_getattr_res res = {
1573 .fattr = fattr,
1574 .server = server,
1575 };
1576 struct rpc_message msg = {
1577 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1578 .rpc_argp = &args,
1579 .rpc_resp = &res,
1580 };
1581
1582 nfs_fattr_init(fattr);
1583 return rpc_call_sync(server->client, &msg, 0);
1584}
1585
1586static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1587{
1588 struct nfs4_exception exception = { };
1589 int err;
1590 do {
1591 err = nfs4_handle_exception(server,
1592 _nfs4_proc_getattr(server, fhandle, fattr),
1593 &exception);
1594 } while (exception.retry);
1595 return err;
1596}
1597
1598/*
1599 * The file is not closed if it is opened due to the a request to change
1600 * the size of the file. The open call will not be needed once the
1601 * VFS layer lookup-intents are implemented.
1602 *
1603 * Close is called when the inode is destroyed.
1604 * If we haven't opened the file for O_WRONLY, we
1605 * need to in the size_change case to obtain a stateid.
1606 *
1607 * Got race?
1608 * Because OPEN is always done by name in nfsv4, it is
1609 * possible that we opened a different file by the same
1610 * name. We can recognize this race condition, but we
1611 * can't do anything about it besides returning an error.
1612 *
1613 * This will be fixed with VFS changes (lookup-intent).
1614 */
1615static int
1616nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1617 struct iattr *sattr)
1618{
1619 struct rpc_cred *cred;
1620 struct inode *inode = dentry->d_inode;
1621 struct nfs_open_context *ctx;
1622 struct nfs4_state *state = NULL;
1623 int status;
1624
1625 nfs_fattr_init(fattr);
1626
1627 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1628 if (IS_ERR(cred))
1629 return PTR_ERR(cred);
1630
1631 /* Search for an existing open(O_WRITE) file */
1632 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1633 if (ctx != NULL)
1634 state = ctx->state;
1635
1636 status = nfs4_do_setattr(inode, fattr, sattr, state);
1637 if (status == 0)
1638 nfs_setattr_update_inode(inode, sattr);
1639 if (ctx != NULL)
1640 put_nfs_open_context(ctx);
1641 put_rpccred(cred);
1642 return status;
1643}
1644
1645static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1646 struct qstr *name, struct nfs_fh *fhandle,
1647 struct nfs_fattr *fattr)
1648{
1649 int status;
1650 struct nfs4_lookup_arg args = {
1651 .bitmask = server->attr_bitmask,
1652 .dir_fh = dirfh,
1653 .name = name,
1654 };
1655 struct nfs4_lookup_res res = {
1656 .server = server,
1657 .fattr = fattr,
1658 .fh = fhandle,
1659 };
1660 struct rpc_message msg = {
1661 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1662 .rpc_argp = &args,
1663 .rpc_resp = &res,
1664 };
1665
1666 nfs_fattr_init(fattr);
1667
1668 dprintk("NFS call lookupfh %s\n", name->name);
1669 status = rpc_call_sync(server->client, &msg, 0);
1670 dprintk("NFS reply lookupfh: %d\n", status);
1671 return status;
1672}
1673
1674static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1675 struct qstr *name, struct nfs_fh *fhandle,
1676 struct nfs_fattr *fattr)
1677{
1678 struct nfs4_exception exception = { };
1679 int err;
1680 do {
1681 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1682 /* FIXME: !!!! */
1683 if (err == -NFS4ERR_MOVED) {
1684 err = -EREMOTE;
1685 break;
1686 }
1687 err = nfs4_handle_exception(server, err, &exception);
1688 } while (exception.retry);
1689 return err;
1690}
1691
1692static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1693 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1694{
1695 int status;
1696
1697 dprintk("NFS call lookup %s\n", name->name);
1698 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1699 if (status == -NFS4ERR_MOVED)
1700 status = nfs4_get_referral(dir, name, fattr, fhandle);
1701 dprintk("NFS reply lookup: %d\n", status);
1702 return status;
1703}
1704
1705static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1706{
1707 struct nfs4_exception exception = { };
1708 int err;
1709 do {
1710 err = nfs4_handle_exception(NFS_SERVER(dir),
1711 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1712 &exception);
1713 } while (exception.retry);
1714 return err;
1715}
1716
1717static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1718{
1719 struct nfs4_accessargs args = {
1720 .fh = NFS_FH(inode),
1721 };
1722 struct nfs4_accessres res = { 0 };
1723 struct rpc_message msg = {
1724 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1725 .rpc_argp = &args,
1726 .rpc_resp = &res,
1727 .rpc_cred = entry->cred,
1728 };
1729 int mode = entry->mask;
1730 int status;
1731
1732 /*
1733 * Determine which access bits we want to ask for...
1734 */
1735 if (mode & MAY_READ)
1736 args.access |= NFS4_ACCESS_READ;
1737 if (S_ISDIR(inode->i_mode)) {
1738 if (mode & MAY_WRITE)
1739 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1740 if (mode & MAY_EXEC)
1741 args.access |= NFS4_ACCESS_LOOKUP;
1742 } else {
1743 if (mode & MAY_WRITE)
1744 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1745 if (mode & MAY_EXEC)
1746 args.access |= NFS4_ACCESS_EXECUTE;
1747 }
1748 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1749 if (!status) {
1750 entry->mask = 0;
1751 if (res.access & NFS4_ACCESS_READ)
1752 entry->mask |= MAY_READ;
1753 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1754 entry->mask |= MAY_WRITE;
1755 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1756 entry->mask |= MAY_EXEC;
1757 }
1758 return status;
1759}
1760
1761static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1762{
1763 struct nfs4_exception exception = { };
1764 int err;
1765 do {
1766 err = nfs4_handle_exception(NFS_SERVER(inode),
1767 _nfs4_proc_access(inode, entry),
1768 &exception);
1769 } while (exception.retry);
1770 return err;
1771}
1772
1773/*
1774 * TODO: For the time being, we don't try to get any attributes
1775 * along with any of the zero-copy operations READ, READDIR,
1776 * READLINK, WRITE.
1777 *
1778 * In the case of the first three, we want to put the GETATTR
1779 * after the read-type operation -- this is because it is hard
1780 * to predict the length of a GETATTR response in v4, and thus
1781 * align the READ data correctly. This means that the GETATTR
1782 * may end up partially falling into the page cache, and we should
1783 * shift it into the 'tail' of the xdr_buf before processing.
1784 * To do this efficiently, we need to know the total length
1785 * of data received, which doesn't seem to be available outside
1786 * of the RPC layer.
1787 *
1788 * In the case of WRITE, we also want to put the GETATTR after
1789 * the operation -- in this case because we want to make sure
1790 * we get the post-operation mtime and size. This means that
1791 * we can't use xdr_encode_pages() as written: we need a variant
1792 * of it which would leave room in the 'tail' iovec.
1793 *
1794 * Both of these changes to the XDR layer would in fact be quite
1795 * minor, but I decided to leave them for a subsequent patch.
1796 */
1797static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1798 unsigned int pgbase, unsigned int pglen)
1799{
1800 struct nfs4_readlink args = {
1801 .fh = NFS_FH(inode),
1802 .pgbase = pgbase,
1803 .pglen = pglen,
1804 .pages = &page,
1805 };
1806 struct rpc_message msg = {
1807 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1808 .rpc_argp = &args,
1809 .rpc_resp = NULL,
1810 };
1811
1812 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1813}
1814
1815static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1816 unsigned int pgbase, unsigned int pglen)
1817{
1818 struct nfs4_exception exception = { };
1819 int err;
1820 do {
1821 err = nfs4_handle_exception(NFS_SERVER(inode),
1822 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1823 &exception);
1824 } while (exception.retry);
1825 return err;
1826}
1827
1828/*
1829 * Got race?
1830 * We will need to arrange for the VFS layer to provide an atomic open.
1831 * Until then, this create/open method is prone to inefficiency and race
1832 * conditions due to the lookup, create, and open VFS calls from sys_open()
1833 * placed on the wire.
1834 *
1835 * Given the above sorry state of affairs, I'm simply sending an OPEN.
1836 * The file will be opened again in the subsequent VFS open call
1837 * (nfs4_proc_file_open).
1838 *
1839 * The open for read will just hang around to be used by any process that
1840 * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1841 */
1842
1843static int
1844nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1845 int flags, struct nameidata *nd)
1846{
1847 struct path path = {
1848 .mnt = nd->mnt,
1849 .dentry = dentry,
1850 };
1851 struct nfs4_state *state;
1852 struct rpc_cred *cred;
1853 int status = 0;
1854
1855 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1856 if (IS_ERR(cred)) {
1857 status = PTR_ERR(cred);
1858 goto out;
1859 }
1860 state = nfs4_do_open(dir, &path, flags, sattr, cred);
1861 put_rpccred(cred);
1862 if (IS_ERR(state)) {
1863 status = PTR_ERR(state);
1864 goto out;
1865 }
1866 d_instantiate(dentry, igrab(state->inode));
1867 if (flags & O_EXCL) {
1868 struct nfs_fattr fattr;
1869 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1870 if (status == 0)
1871 nfs_setattr_update_inode(state->inode, sattr);
1872 nfs_post_op_update_inode(state->inode, &fattr);
1873 }
1874 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1875 status = nfs4_intent_set_file(nd, &path, state);
1876 else
1877 nfs4_close_state(&path, state, flags);
1878out:
1879 return status;
1880}
1881
1882static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1883{
1884 struct nfs_server *server = NFS_SERVER(dir);
1885 struct nfs4_remove_arg args = {
1886 .fh = NFS_FH(dir),
1887 .name = name,
1888 .bitmask = server->attr_bitmask,
1889 };
1890 struct nfs_fattr dir_attr;
1891 struct nfs4_remove_res res = {
1892 .server = server,
1893 .dir_attr = &dir_attr,
1894 };
1895 struct rpc_message msg = {
1896 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1897 .rpc_argp = &args,
1898 .rpc_resp = &res,
1899 };
1900 int status;
1901
1902 nfs_fattr_init(res.dir_attr);
1903 status = rpc_call_sync(server->client, &msg, 0);
1904 if (status == 0) {
1905 update_changeattr(dir, &res.cinfo);
1906 nfs_post_op_update_inode(dir, res.dir_attr);
1907 }
1908 return status;
1909}
1910
1911static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1912{
1913 struct nfs4_exception exception = { };
1914 int err;
1915 do {
1916 err = nfs4_handle_exception(NFS_SERVER(dir),
1917 _nfs4_proc_remove(dir, name),
1918 &exception);
1919 } while (exception.retry);
1920 return err;
1921}
1922
1923struct unlink_desc {
1924 struct nfs4_remove_arg args;
1925 struct nfs4_remove_res res;
1926 struct nfs_fattr dir_attr;
1927};
1928
1929static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1930 struct qstr *name)
1931{
1932 struct nfs_server *server = NFS_SERVER(dir->d_inode);
1933 struct unlink_desc *up;
1934
1935 up = kmalloc(sizeof(*up), GFP_KERNEL);
1936 if (!up)
1937 return -ENOMEM;
1938
1939 up->args.fh = NFS_FH(dir->d_inode);
1940 up->args.name = name;
1941 up->args.bitmask = server->attr_bitmask;
1942 up->res.server = server;
1943 up->res.dir_attr = &up->dir_attr;
1944
1945 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1946 msg->rpc_argp = &up->args;
1947 msg->rpc_resp = &up->res;
1948 return 0;
1949}
1950
1951static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1952{
1953 struct rpc_message *msg = &task->tk_msg;
1954 struct unlink_desc *up;
1955
1956 if (msg->rpc_resp != NULL) {
1957 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1958 update_changeattr(dir->d_inode, &up->res.cinfo);
1959 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1960 kfree(up);
1961 msg->rpc_resp = NULL;
1962 msg->rpc_argp = NULL;
1963 }
1964 return 0;
1965}
1966
1967static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1968 struct inode *new_dir, struct qstr *new_name)
1969{
1970 struct nfs_server *server = NFS_SERVER(old_dir);
1971 struct nfs4_rename_arg arg = {
1972 .old_dir = NFS_FH(old_dir),
1973 .new_dir = NFS_FH(new_dir),
1974 .old_name = old_name,
1975 .new_name = new_name,
1976 .bitmask = server->attr_bitmask,
1977 };
1978 struct nfs_fattr old_fattr, new_fattr;
1979 struct nfs4_rename_res res = {
1980 .server = server,
1981 .old_fattr = &old_fattr,
1982 .new_fattr = &new_fattr,
1983 };
1984 struct rpc_message msg = {
1985 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1986 .rpc_argp = &arg,
1987 .rpc_resp = &res,
1988 };
1989 int status;
1990
1991 nfs_fattr_init(res.old_fattr);
1992 nfs_fattr_init(res.new_fattr);
1993 status = rpc_call_sync(server->client, &msg, 0);
1994
1995 if (!status) {
1996 update_changeattr(old_dir, &res.old_cinfo);
1997 nfs_post_op_update_inode(old_dir, res.old_fattr);
1998 update_changeattr(new_dir, &res.new_cinfo);
1999 nfs_post_op_update_inode(new_dir, res.new_fattr);
2000 }
2001 return status;
2002}
2003
2004static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2005 struct inode *new_dir, struct qstr *new_name)
2006{
2007 struct nfs4_exception exception = { };
2008 int err;
2009 do {
2010 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2011 _nfs4_proc_rename(old_dir, old_name,
2012 new_dir, new_name),
2013 &exception);
2014 } while (exception.retry);
2015 return err;
2016}
2017
2018static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2019{
2020 struct nfs_server *server = NFS_SERVER(inode);
2021 struct nfs4_link_arg arg = {
2022 .fh = NFS_FH(inode),
2023 .dir_fh = NFS_FH(dir),
2024 .name = name,
2025 .bitmask = server->attr_bitmask,
2026 };
2027 struct nfs_fattr fattr, dir_attr;
2028 struct nfs4_link_res res = {
2029 .server = server,
2030 .fattr = &fattr,
2031 .dir_attr = &dir_attr,
2032 };
2033 struct rpc_message msg = {
2034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2035 .rpc_argp = &arg,
2036 .rpc_resp = &res,
2037 };
2038 int status;
2039
2040 nfs_fattr_init(res.fattr);
2041 nfs_fattr_init(res.dir_attr);
2042 status = rpc_call_sync(server->client, &msg, 0);
2043 if (!status) {
2044 update_changeattr(dir, &res.cinfo);
2045 nfs_post_op_update_inode(dir, res.dir_attr);
2046 nfs_post_op_update_inode(inode, res.fattr);
2047 }
2048
2049 return status;
2050}
2051
2052static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2053{
2054 struct nfs4_exception exception = { };
2055 int err;
2056 do {
2057 err = nfs4_handle_exception(NFS_SERVER(inode),
2058 _nfs4_proc_link(inode, dir, name),
2059 &exception);
2060 } while (exception.retry);
2061 return err;
2062}
2063
2064static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2065 struct page *page, unsigned int len, struct iattr *sattr)
2066{
2067 struct nfs_server *server = NFS_SERVER(dir);
2068 struct nfs_fh fhandle;
2069 struct nfs_fattr fattr, dir_fattr;
2070 struct nfs4_create_arg arg = {
2071 .dir_fh = NFS_FH(dir),
2072 .server = server,
2073 .name = &dentry->d_name,
2074 .attrs = sattr,
2075 .ftype = NF4LNK,
2076 .bitmask = server->attr_bitmask,
2077 };
2078 struct nfs4_create_res res = {
2079 .server = server,
2080 .fh = &fhandle,
2081 .fattr = &fattr,
2082 .dir_fattr = &dir_fattr,
2083 };
2084 struct rpc_message msg = {
2085 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2086 .rpc_argp = &arg,
2087 .rpc_resp = &res,
2088 };
2089 int status;
2090
2091 if (len > NFS4_MAXPATHLEN)
2092 return -ENAMETOOLONG;
2093
2094 arg.u.symlink.pages = &page;
2095 arg.u.symlink.len = len;
2096 nfs_fattr_init(&fattr);
2097 nfs_fattr_init(&dir_fattr);
2098
2099 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2100 if (!status) {
2101 update_changeattr(dir, &res.dir_cinfo);
2102 nfs_post_op_update_inode(dir, res.dir_fattr);
2103 status = nfs_instantiate(dentry, &fhandle, &fattr);
2104 }
2105 return status;
2106}
2107
2108static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2109 struct page *page, unsigned int len, struct iattr *sattr)
2110{
2111 struct nfs4_exception exception = { };
2112 int err;
2113 do {
2114 err = nfs4_handle_exception(NFS_SERVER(dir),
2115 _nfs4_proc_symlink(dir, dentry, page,
2116 len, sattr),
2117 &exception);
2118 } while (exception.retry);
2119 return err;
2120}
2121
2122static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2123 struct iattr *sattr)
2124{
2125 struct nfs_server *server = NFS_SERVER(dir);
2126 struct nfs_fh fhandle;
2127 struct nfs_fattr fattr, dir_fattr;
2128 struct nfs4_create_arg arg = {
2129 .dir_fh = NFS_FH(dir),
2130 .server = server,
2131 .name = &dentry->d_name,
2132 .attrs = sattr,
2133 .ftype = NF4DIR,
2134 .bitmask = server->attr_bitmask,
2135 };
2136 struct nfs4_create_res res = {
2137 .server = server,
2138 .fh = &fhandle,
2139 .fattr = &fattr,
2140 .dir_fattr = &dir_fattr,
2141 };
2142 struct rpc_message msg = {
2143 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2144 .rpc_argp = &arg,
2145 .rpc_resp = &res,
2146 };
2147 int status;
2148
2149 nfs_fattr_init(&fattr);
2150 nfs_fattr_init(&dir_fattr);
2151
2152 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2153 if (!status) {
2154 update_changeattr(dir, &res.dir_cinfo);
2155 nfs_post_op_update_inode(dir, res.dir_fattr);
2156 status = nfs_instantiate(dentry, &fhandle, &fattr);
2157 }
2158 return status;
2159}
2160
2161static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2162 struct iattr *sattr)
2163{
2164 struct nfs4_exception exception = { };
2165 int err;
2166 do {
2167 err = nfs4_handle_exception(NFS_SERVER(dir),
2168 _nfs4_proc_mkdir(dir, dentry, sattr),
2169 &exception);
2170 } while (exception.retry);
2171 return err;
2172}
2173
2174static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2175 u64 cookie, struct page *page, unsigned int count, int plus)
2176{
2177 struct inode *dir = dentry->d_inode;
2178 struct nfs4_readdir_arg args = {
2179 .fh = NFS_FH(dir),
2180 .pages = &page,
2181 .pgbase = 0,
2182 .count = count,
2183 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2184 };
2185 struct nfs4_readdir_res res;
2186 struct rpc_message msg = {
2187 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2188 .rpc_argp = &args,
2189 .rpc_resp = &res,
2190 .rpc_cred = cred,
2191 };
2192 int status;
2193
2194 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2195 dentry->d_parent->d_name.name,
2196 dentry->d_name.name,
2197 (unsigned long long)cookie);
2198 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2199 res.pgbase = args.pgbase;
2200 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2201 if (status == 0)
2202 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2203 dprintk("%s: returns %d\n", __FUNCTION__, status);
2204 return status;
2205}
2206
2207static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2208 u64 cookie, struct page *page, unsigned int count, int plus)
2209{
2210 struct nfs4_exception exception = { };
2211 int err;
2212 do {
2213 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2214 _nfs4_proc_readdir(dentry, cred, cookie,
2215 page, count, plus),
2216 &exception);
2217 } while (exception.retry);
2218 return err;
2219}
2220
2221static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2222 struct iattr *sattr, dev_t rdev)
2223{
2224 struct nfs_server *server = NFS_SERVER(dir);
2225 struct nfs_fh fh;
2226 struct nfs_fattr fattr, dir_fattr;
2227 struct nfs4_create_arg arg = {
2228 .dir_fh = NFS_FH(dir),
2229 .server = server,
2230 .name = &dentry->d_name,
2231 .attrs = sattr,
2232 .bitmask = server->attr_bitmask,
2233 };
2234 struct nfs4_create_res res = {
2235 .server = server,
2236 .fh = &fh,
2237 .fattr = &fattr,
2238 .dir_fattr = &dir_fattr,
2239 };
2240 struct rpc_message msg = {
2241 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2242 .rpc_argp = &arg,
2243 .rpc_resp = &res,
2244 };
2245 int status;
2246 int mode = sattr->ia_mode;
2247
2248 nfs_fattr_init(&fattr);
2249 nfs_fattr_init(&dir_fattr);
2250
2251 BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2252 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2253 if (S_ISFIFO(mode))
2254 arg.ftype = NF4FIFO;
2255 else if (S_ISBLK(mode)) {
2256 arg.ftype = NF4BLK;
2257 arg.u.device.specdata1 = MAJOR(rdev);
2258 arg.u.device.specdata2 = MINOR(rdev);
2259 }
2260 else if (S_ISCHR(mode)) {
2261 arg.ftype = NF4CHR;
2262 arg.u.device.specdata1 = MAJOR(rdev);
2263 arg.u.device.specdata2 = MINOR(rdev);
2264 }
2265 else
2266 arg.ftype = NF4SOCK;
2267
2268 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2269 if (status == 0) {
2270 update_changeattr(dir, &res.dir_cinfo);
2271 nfs_post_op_update_inode(dir, res.dir_fattr);
2272 status = nfs_instantiate(dentry, &fh, &fattr);
2273 }
2274 return status;
2275}
2276
2277static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2278 struct iattr *sattr, dev_t rdev)
2279{
2280 struct nfs4_exception exception = { };
2281 int err;
2282 do {
2283 err = nfs4_handle_exception(NFS_SERVER(dir),
2284 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2285 &exception);
2286 } while (exception.retry);
2287 return err;
2288}
2289
2290static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2291 struct nfs_fsstat *fsstat)
2292{
2293 struct nfs4_statfs_arg args = {
2294 .fh = fhandle,
2295 .bitmask = server->attr_bitmask,
2296 };
2297 struct rpc_message msg = {
2298 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2299 .rpc_argp = &args,
2300 .rpc_resp = fsstat,
2301 };
2302
2303 nfs_fattr_init(fsstat->fattr);
2304 return rpc_call_sync(server->client, &msg, 0);
2305}
2306
2307static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2308{
2309 struct nfs4_exception exception = { };
2310 int err;
2311 do {
2312 err = nfs4_handle_exception(server,
2313 _nfs4_proc_statfs(server, fhandle, fsstat),
2314 &exception);
2315 } while (exception.retry);
2316 return err;
2317}
2318
2319static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2320 struct nfs_fsinfo *fsinfo)
2321{
2322 struct nfs4_fsinfo_arg args = {
2323 .fh = fhandle,
2324 .bitmask = server->attr_bitmask,
2325 };
2326 struct rpc_message msg = {
2327 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2328 .rpc_argp = &args,
2329 .rpc_resp = fsinfo,
2330 };
2331
2332 return rpc_call_sync(server->client, &msg, 0);
2333}
2334
2335static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2336{
2337 struct nfs4_exception exception = { };
2338 int err;
2339
2340 do {
2341 err = nfs4_handle_exception(server,
2342 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2343 &exception);
2344 } while (exception.retry);
2345 return err;
2346}
2347
2348static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2349{
2350 nfs_fattr_init(fsinfo->fattr);
2351 return nfs4_do_fsinfo(server, fhandle, fsinfo);
2352}
2353
2354static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2355 struct nfs_pathconf *pathconf)
2356{
2357 struct nfs4_pathconf_arg args = {
2358 .fh = fhandle,
2359 .bitmask = server->attr_bitmask,
2360 };
2361 struct rpc_message msg = {
2362 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2363 .rpc_argp = &args,
2364 .rpc_resp = pathconf,
2365 };
2366
2367 /* None of the pathconf attributes are mandatory to implement */
2368 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2369 memset(pathconf, 0, sizeof(*pathconf));
2370 return 0;
2371 }
2372
2373 nfs_fattr_init(pathconf->fattr);
2374 return rpc_call_sync(server->client, &msg, 0);
2375}
2376
2377static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2378 struct nfs_pathconf *pathconf)
2379{
2380 struct nfs4_exception exception = { };
2381 int err;
2382
2383 do {
2384 err = nfs4_handle_exception(server,
2385 _nfs4_proc_pathconf(server, fhandle, pathconf),
2386 &exception);
2387 } while (exception.retry);
2388 return err;
2389}
2390
2391static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2392{
2393 struct nfs_server *server = NFS_SERVER(data->inode);
2394
2395 if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2396 rpc_restart_call(task);
2397 return -EAGAIN;
2398 }
2399 if (task->tk_status > 0)
2400 renew_lease(server, data->timestamp);
2401 return 0;
2402}
2403
2404static void nfs4_proc_read_setup(struct nfs_read_data *data)
2405{
2406 struct rpc_message msg = {
2407 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2408 .rpc_argp = &data->args,
2409 .rpc_resp = &data->res,
2410 .rpc_cred = data->cred,
2411 };
2412
2413 data->timestamp = jiffies;
2414
2415 rpc_call_setup(&data->task, &msg, 0);
2416}
2417
2418static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2419{
2420 struct inode *inode = data->inode;
2421
2422 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2423 rpc_restart_call(task);
2424 return -EAGAIN;
2425 }
2426 if (task->tk_status >= 0) {
2427 renew_lease(NFS_SERVER(inode), data->timestamp);
2428 nfs_post_op_update_inode(inode, data->res.fattr);
2429 }
2430 return 0;
2431}
2432
2433static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2434{
2435 struct rpc_message msg = {
2436 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2437 .rpc_argp = &data->args,
2438 .rpc_resp = &data->res,
2439 .rpc_cred = data->cred,
2440 };
2441 struct inode *inode = data->inode;
2442 struct nfs_server *server = NFS_SERVER(inode);
2443 int stable;
2444
2445 if (how & FLUSH_STABLE) {
2446 if (!NFS_I(inode)->ncommit)
2447 stable = NFS_FILE_SYNC;
2448 else
2449 stable = NFS_DATA_SYNC;
2450 } else
2451 stable = NFS_UNSTABLE;
2452 data->args.stable = stable;
2453 data->args.bitmask = server->attr_bitmask;
2454 data->res.server = server;
2455
2456 data->timestamp = jiffies;
2457
2458 /* Finalize the task. */
2459 rpc_call_setup(&data->task, &msg, 0);
2460}
2461
2462static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2463{
2464 struct inode *inode = data->inode;
2465
2466 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2467 rpc_restart_call(task);
2468 return -EAGAIN;
2469 }
2470 if (task->tk_status >= 0)
2471 nfs_post_op_update_inode(inode, data->res.fattr);
2472 return 0;
2473}
2474
2475static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2476{
2477 struct rpc_message msg = {
2478 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2479 .rpc_argp = &data->args,
2480 .rpc_resp = &data->res,
2481 .rpc_cred = data->cred,
2482 };
2483 struct nfs_server *server = NFS_SERVER(data->inode);
2484
2485 data->args.bitmask = server->attr_bitmask;
2486 data->res.server = server;
2487
2488 rpc_call_setup(&data->task, &msg, 0);
2489}
2490
2491/*
2492 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2493 * standalone procedure for queueing an asynchronous RENEW.
2494 */
2495static void nfs4_renew_done(struct rpc_task *task, void *data)
2496{
2497 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2498 unsigned long timestamp = (unsigned long)data;
2499
2500 if (task->tk_status < 0) {
2501 switch (task->tk_status) {
2502 case -NFS4ERR_STALE_CLIENTID:
2503 case -NFS4ERR_EXPIRED:
2504 case -NFS4ERR_CB_PATH_DOWN:
2505 nfs4_schedule_state_recovery(clp);
2506 }
2507 return;
2508 }
2509 spin_lock(&clp->cl_lock);
2510 if (time_before(clp->cl_last_renewal,timestamp))
2511 clp->cl_last_renewal = timestamp;
2512 spin_unlock(&clp->cl_lock);
2513}
2514
2515static const struct rpc_call_ops nfs4_renew_ops = {
2516 .rpc_call_done = nfs4_renew_done,
2517};
2518
2519int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2520{
2521 struct rpc_message msg = {
2522 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2523 .rpc_argp = clp,
2524 .rpc_cred = cred,
2525 };
2526
2527 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2528 &nfs4_renew_ops, (void *)jiffies);
2529}
2530
2531int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2532{
2533 struct rpc_message msg = {
2534 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2535 .rpc_argp = clp,
2536 .rpc_cred = cred,
2537 };
2538 unsigned long now = jiffies;
2539 int status;
2540
2541 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2542 if (status < 0)
2543 return status;
2544 spin_lock(&clp->cl_lock);
2545 if (time_before(clp->cl_last_renewal,now))
2546 clp->cl_last_renewal = now;
2547 spin_unlock(&clp->cl_lock);
2548 return 0;
2549}
2550
2551static inline int nfs4_server_supports_acls(struct nfs_server *server)
2552{
2553 return (server->caps & NFS_CAP_ACLS)
2554 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2555 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2556}
2557
2558/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2559 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2560 * the stack.
2561 */
2562#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2563
2564static void buf_to_pages(const void *buf, size_t buflen,
2565 struct page **pages, unsigned int *pgbase)
2566{
2567 const void *p = buf;
2568
2569 *pgbase = offset_in_page(buf);
2570 p -= *pgbase;
2571 while (p < buf + buflen) {
2572 *(pages++) = virt_to_page(p);
2573 p += PAGE_CACHE_SIZE;
2574 }
2575}
2576
2577struct nfs4_cached_acl {
2578 int cached;
2579 size_t len;
2580 char data[0];
2581};
2582
2583static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2584{
2585 struct nfs_inode *nfsi = NFS_I(inode);
2586
2587 spin_lock(&inode->i_lock);
2588 kfree(nfsi->nfs4_acl);
2589 nfsi->nfs4_acl = acl;
2590 spin_unlock(&inode->i_lock);
2591}
2592
2593static void nfs4_zap_acl_attr(struct inode *inode)
2594{
2595 nfs4_set_cached_acl(inode, NULL);
2596}
2597
2598static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2599{
2600 struct nfs_inode *nfsi = NFS_I(inode);
2601 struct nfs4_cached_acl *acl;
2602 int ret = -ENOENT;
2603
2604 spin_lock(&inode->i_lock);
2605 acl = nfsi->nfs4_acl;
2606 if (acl == NULL)
2607 goto out;
2608 if (buf == NULL) /* user is just asking for length */
2609 goto out_len;
2610 if (acl->cached == 0)
2611 goto out;
2612 ret = -ERANGE; /* see getxattr(2) man page */
2613 if (acl->len > buflen)
2614 goto out;
2615 memcpy(buf, acl->data, acl->len);
2616out_len:
2617 ret = acl->len;
2618out:
2619 spin_unlock(&inode->i_lock);
2620 return ret;
2621}
2622
2623static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2624{
2625 struct nfs4_cached_acl *acl;
2626
2627 if (buf && acl_len <= PAGE_SIZE) {
2628 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2629 if (acl == NULL)
2630 goto out;
2631 acl->cached = 1;
2632 memcpy(acl->data, buf, acl_len);
2633 } else {
2634 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2635 if (acl == NULL)
2636 goto out;
2637 acl->cached = 0;
2638 }
2639 acl->len = acl_len;
2640out:
2641 nfs4_set_cached_acl(inode, acl);
2642}
2643
2644static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2645{
2646 struct page *pages[NFS4ACL_MAXPAGES];
2647 struct nfs_getaclargs args = {
2648 .fh = NFS_FH(inode),
2649 .acl_pages = pages,
2650 .acl_len = buflen,
2651 };
2652 size_t resp_len = buflen;
2653 void *resp_buf;
2654 struct rpc_message msg = {
2655 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2656 .rpc_argp = &args,
2657 .rpc_resp = &resp_len,
2658 };
2659 struct page *localpage = NULL;
2660 int ret;
2661
2662 if (buflen < PAGE_SIZE) {
2663 /* As long as we're doing a round trip to the server anyway,
2664 * let's be prepared for a page of acl data. */
2665 localpage = alloc_page(GFP_KERNEL);
2666 resp_buf = page_address(localpage);
2667 if (localpage == NULL)
2668 return -ENOMEM;
2669 args.acl_pages[0] = localpage;
2670 args.acl_pgbase = 0;
2671 resp_len = args.acl_len = PAGE_SIZE;
2672 } else {
2673 resp_buf = buf;
2674 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2675 }
2676 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2677 if (ret)
2678 goto out_free;
2679 if (resp_len > args.acl_len)
2680 nfs4_write_cached_acl(inode, NULL, resp_len);
2681 else
2682 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2683 if (buf) {
2684 ret = -ERANGE;
2685 if (resp_len > buflen)
2686 goto out_free;
2687 if (localpage)
2688 memcpy(buf, resp_buf, resp_len);
2689 }
2690 ret = resp_len;
2691out_free:
2692 if (localpage)
2693 __free_page(localpage);
2694 return ret;
2695}
2696
2697static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2698{
2699 struct nfs4_exception exception = { };
2700 ssize_t ret;
2701 do {
2702 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2703 if (ret >= 0)
2704 break;
2705 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2706 } while (exception.retry);
2707 return ret;
2708}
2709
2710static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2711{
2712 struct nfs_server *server = NFS_SERVER(inode);
2713 int ret;
2714
2715 if (!nfs4_server_supports_acls(server))
2716 return -EOPNOTSUPP;
2717 ret = nfs_revalidate_inode(server, inode);
2718 if (ret < 0)
2719 return ret;
2720 ret = nfs4_read_cached_acl(inode, buf, buflen);
2721 if (ret != -ENOENT)
2722 return ret;
2723 return nfs4_get_acl_uncached(inode, buf, buflen);
2724}
2725
2726static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2727{
2728 struct nfs_server *server = NFS_SERVER(inode);
2729 struct page *pages[NFS4ACL_MAXPAGES];
2730 struct nfs_setaclargs arg = {
2731 .fh = NFS_FH(inode),
2732 .acl_pages = pages,
2733 .acl_len = buflen,
2734 };
2735 struct rpc_message msg = {
2736 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2737 .rpc_argp = &arg,
2738 .rpc_resp = NULL,
2739 };
2740 int ret;
2741
2742 if (!nfs4_server_supports_acls(server))
2743 return -EOPNOTSUPP;
2744 nfs_inode_return_delegation(inode);
2745 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2746 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2747 nfs_zap_caches(inode);
2748 return ret;
2749}
2750
2751static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2752{
2753 struct nfs4_exception exception = { };
2754 int err;
2755 do {
2756 err = nfs4_handle_exception(NFS_SERVER(inode),
2757 __nfs4_proc_set_acl(inode, buf, buflen),
2758 &exception);
2759 } while (exception.retry);
2760 return err;
2761}
2762
2763static int
2764nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2765{
2766 struct nfs_client *clp = server->nfs_client;
2767
2768 if (!clp || task->tk_status >= 0)
2769 return 0;
2770 switch(task->tk_status) {
2771 case -NFS4ERR_STALE_CLIENTID:
2772 case -NFS4ERR_STALE_STATEID:
2773 case -NFS4ERR_EXPIRED:
2774 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2775 nfs4_schedule_state_recovery(clp);
2776 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2777 rpc_wake_up_task(task);
2778 task->tk_status = 0;
2779 return -EAGAIN;
2780 case -NFS4ERR_DELAY:
2781 nfs_inc_server_stats((struct nfs_server *) server,
2782 NFSIOS_DELAY);
2783 case -NFS4ERR_GRACE:
2784 rpc_delay(task, NFS4_POLL_RETRY_MAX);
2785 task->tk_status = 0;
2786 return -EAGAIN;
2787 case -NFS4ERR_OLD_STATEID:
2788 task->tk_status = 0;
2789 return -EAGAIN;
2790 }
2791 task->tk_status = nfs4_map_errors(task->tk_status);
2792 return 0;
2793}
2794
2795static int nfs4_wait_bit_interruptible(void *word)
2796{
2797 if (signal_pending(current))
2798 return -ERESTARTSYS;
2799 schedule();
2800 return 0;
2801}
2802
2803static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2804{
2805 sigset_t oldset;
2806 int res;
2807
2808 might_sleep();
2809
2810 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2811
2812 rpc_clnt_sigmask(clnt, &oldset);
2813 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2814 nfs4_wait_bit_interruptible,
2815 TASK_INTERRUPTIBLE);
2816 rpc_clnt_sigunmask(clnt, &oldset);
2817
2818 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2819 return res;
2820}
2821
2822static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2823{
2824 sigset_t oldset;
2825 int res = 0;
2826
2827 might_sleep();
2828
2829 if (*timeout <= 0)
2830 *timeout = NFS4_POLL_RETRY_MIN;
2831 if (*timeout > NFS4_POLL_RETRY_MAX)
2832 *timeout = NFS4_POLL_RETRY_MAX;
2833 rpc_clnt_sigmask(clnt, &oldset);
2834 if (clnt->cl_intr) {
2835 schedule_timeout_interruptible(*timeout);
2836 if (signalled())
2837 res = -ERESTARTSYS;
2838 } else
2839 schedule_timeout_uninterruptible(*timeout);
2840 rpc_clnt_sigunmask(clnt, &oldset);
2841 *timeout <<= 1;
2842 return res;
2843}
2844
2845/* This is the error handling routine for processes that are allowed
2846 * to sleep.
2847 */
2848static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2849{
2850 struct nfs_client *clp = server->nfs_client;
2851 int ret = errorcode;
2852
2853 exception->retry = 0;
2854 switch(errorcode) {
2855 case 0:
2856 return 0;
2857 case -NFS4ERR_STALE_CLIENTID:
2858 case -NFS4ERR_STALE_STATEID:
2859 case -NFS4ERR_EXPIRED:
2860 nfs4_schedule_state_recovery(clp);
2861 ret = nfs4_wait_clnt_recover(server->client, clp);
2862 if (ret == 0)
2863 exception->retry = 1;
2864 break;
2865 case -NFS4ERR_FILE_OPEN:
2866 case -NFS4ERR_GRACE:
2867 case -NFS4ERR_DELAY:
2868 ret = nfs4_delay(server->client, &exception->timeout);
2869 if (ret != 0)
2870 break;
2871 case -NFS4ERR_OLD_STATEID:
2872 exception->retry = 1;
2873 }
2874 /* We failed to handle the error */
2875 return nfs4_map_errors(ret);
2876}
2877
2878int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2879{
2880 nfs4_verifier sc_verifier;
2881 struct nfs4_setclientid setclientid = {
2882 .sc_verifier = &sc_verifier,
2883 .sc_prog = program,
2884 };
2885 struct rpc_message msg = {
2886 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2887 .rpc_argp = &setclientid,
2888 .rpc_resp = clp,
2889 .rpc_cred = cred,
2890 };
2891 __be32 *p;
2892 int loop = 0;
2893 int status;
2894
2895 p = (__be32*)sc_verifier.data;
2896 *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2897 *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2898
2899 for(;;) {
2900 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2901 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2902 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2903 cred->cr_ops->cr_name,
2904 clp->cl_id_uniquifier);
2905 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2906 sizeof(setclientid.sc_netid), "tcp");
2907 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2908 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2909 clp->cl_ipaddr, port >> 8, port & 255);
2910
2911 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2912 if (status != -NFS4ERR_CLID_INUSE)
2913 break;
2914 if (signalled())
2915 break;
2916 if (loop++ & 1)
2917 ssleep(clp->cl_lease_time + 1);
2918 else
2919 if (++clp->cl_id_uniquifier == 0)
2920 break;
2921 }
2922 return status;
2923}
2924
2925static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2926{
2927 struct nfs_fsinfo fsinfo;
2928 struct rpc_message msg = {
2929 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2930 .rpc_argp = clp,
2931 .rpc_resp = &fsinfo,
2932 .rpc_cred = cred,
2933 };
2934 unsigned long now;
2935 int status;
2936
2937 now = jiffies;
2938 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2939 if (status == 0) {
2940 spin_lock(&clp->cl_lock);
2941 clp->cl_lease_time = fsinfo.lease_time * HZ;
2942 clp->cl_last_renewal = now;
2943 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2944 spin_unlock(&clp->cl_lock);
2945 }
2946 return status;
2947}
2948
2949int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2950{
2951 long timeout;
2952 int err;
2953 do {
2954 err = _nfs4_proc_setclientid_confirm(clp, cred);
2955 switch (err) {
2956 case 0:
2957 return err;
2958 case -NFS4ERR_RESOURCE:
2959 /* The IBM lawyers misread another document! */
2960 case -NFS4ERR_DELAY:
2961 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2962 }
2963 } while (err == 0);
2964 return err;
2965}
2966
2967struct nfs4_delegreturndata {
2968 struct nfs4_delegreturnargs args;
2969 struct nfs4_delegreturnres res;
2970 struct nfs_fh fh;
2971 nfs4_stateid stateid;
2972 struct rpc_cred *cred;
2973 unsigned long timestamp;
2974 struct nfs_fattr fattr;
2975 int rpc_status;
2976};
2977
2978static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2979{
2980 struct nfs4_delegreturndata *data = calldata;
2981 struct rpc_message msg = {
2982 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2983 .rpc_argp = &data->args,
2984 .rpc_resp = &data->res,
2985 .rpc_cred = data->cred,
2986 };
2987 nfs_fattr_init(data->res.fattr);
2988 rpc_call_setup(task, &msg, 0);
2989}
2990
2991static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2992{
2993 struct nfs4_delegreturndata *data = calldata;
2994 data->rpc_status = task->tk_status;
2995 if (data->rpc_status == 0)
2996 renew_lease(data->res.server, data->timestamp);
2997}
2998
2999static void nfs4_delegreturn_release(void *calldata)
3000{
3001 struct nfs4_delegreturndata *data = calldata;
3002
3003 put_rpccred(data->cred);
3004 kfree(calldata);
3005}
3006
3007static const struct rpc_call_ops nfs4_delegreturn_ops = {
3008 .rpc_call_prepare = nfs4_delegreturn_prepare,
3009 .rpc_call_done = nfs4_delegreturn_done,
3010 .rpc_release = nfs4_delegreturn_release,
3011};
3012
3013static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3014{
3015 struct nfs4_delegreturndata *data;
3016 struct nfs_server *server = NFS_SERVER(inode);
3017 struct rpc_task *task;
3018 int status;
3019
3020 data = kmalloc(sizeof(*data), GFP_KERNEL);
3021 if (data == NULL)
3022 return -ENOMEM;
3023 data->args.fhandle = &data->fh;
3024 data->args.stateid = &data->stateid;
3025 data->args.bitmask = server->attr_bitmask;
3026 nfs_copy_fh(&data->fh, NFS_FH(inode));
3027 memcpy(&data->stateid, stateid, sizeof(data->stateid));
3028 data->res.fattr = &data->fattr;
3029 data->res.server = server;
3030 data->cred = get_rpccred(cred);
3031 data->timestamp = jiffies;
3032 data->rpc_status = 0;
3033
3034 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3035 if (IS_ERR(task))
3036 return PTR_ERR(task);
3037 status = nfs4_wait_for_completion_rpc_task(task);
3038 if (status == 0) {
3039 status = data->rpc_status;
3040 if (status == 0)
3041 nfs_post_op_update_inode(inode, &data->fattr);
3042 }
3043 rpc_put_task(task);
3044 return status;
3045}
3046
3047int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3048{
3049 struct nfs_server *server = NFS_SERVER(inode);
3050 struct nfs4_exception exception = { };
3051 int err;
3052 do {
3053 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3054 switch (err) {
3055 case -NFS4ERR_STALE_STATEID:
3056 case -NFS4ERR_EXPIRED:
3057 case 0:
3058 return 0;
3059 }
3060 err = nfs4_handle_exception(server, err, &exception);
3061 } while (exception.retry);
3062 return err;
3063}
3064
3065#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3066#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3067
3068/*
3069 * sleep, with exponential backoff, and retry the LOCK operation.
3070 */
3071static unsigned long
3072nfs4_set_lock_task_retry(unsigned long timeout)
3073{
3074 schedule_timeout_interruptible(timeout);
3075 timeout <<= 1;
3076 if (timeout > NFS4_LOCK_MAXTIMEOUT)
3077 return NFS4_LOCK_MAXTIMEOUT;
3078 return timeout;
3079}
3080
3081static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3082{
3083 struct inode *inode = state->inode;
3084 struct nfs_server *server = NFS_SERVER(inode);
3085 struct nfs_client *clp = server->nfs_client;
3086 struct nfs_lockt_args arg = {
3087 .fh = NFS_FH(inode),
3088 .fl = request,
3089 };
3090 struct nfs_lockt_res res = {
3091 .denied = request,
3092 };
3093 struct rpc_message msg = {
3094 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3095 .rpc_argp = &arg,
3096 .rpc_resp = &res,
3097 .rpc_cred = state->owner->so_cred,
3098 };
3099 struct nfs4_lock_state *lsp;
3100 int status;
3101
3102 down_read(&clp->cl_sem);
3103 arg.lock_owner.clientid = clp->cl_clientid;
3104 status = nfs4_set_lock_state(state, request);
3105 if (status != 0)
3106 goto out;
3107 lsp = request->fl_u.nfs4_fl.owner;
3108 arg.lock_owner.id = lsp->ls_id.id;
3109 status = rpc_call_sync(server->client, &msg, 0);
3110 switch (status) {
3111 case 0:
3112 request->fl_type = F_UNLCK;
3113 break;
3114 case -NFS4ERR_DENIED:
3115 status = 0;
3116 }
3117 request->fl_ops->fl_release_private(request);
3118out:
3119 up_read(&clp->cl_sem);
3120 return status;
3121}
3122
3123static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3124{
3125 struct nfs4_exception exception = { };
3126 int err;
3127
3128 do {
3129 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3130 _nfs4_proc_getlk(state, cmd, request),
3131 &exception);
3132 } while (exception.retry);
3133 return err;
3134}
3135
3136static int do_vfs_lock(struct file *file, struct file_lock *fl)
3137{
3138 int res = 0;
3139 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3140 case FL_POSIX:
3141 res = posix_lock_file_wait(file, fl);
3142 break;
3143 case FL_FLOCK:
3144 res = flock_lock_file_wait(file, fl);
3145 break;
3146 default:
3147 BUG();
3148 }
3149 return res;
3150}
3151
3152struct nfs4_unlockdata {
3153 struct nfs_locku_args arg;
3154 struct nfs_locku_res res;
3155 struct nfs4_lock_state *lsp;
3156 struct nfs_open_context *ctx;
3157 struct file_lock fl;
3158 const struct nfs_server *server;
3159 unsigned long timestamp;
3160};
3161
3162static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3163 struct nfs_open_context *ctx,
3164 struct nfs4_lock_state *lsp,
3165 struct nfs_seqid *seqid)
3166{
3167 struct nfs4_unlockdata *p;
3168 struct inode *inode = lsp->ls_state->inode;
3169
3170 p = kmalloc(sizeof(*p), GFP_KERNEL);
3171 if (p == NULL)
3172 return NULL;
3173 p->arg.fh = NFS_FH(inode);
3174 p->arg.fl = &p->fl;
3175 p->arg.seqid = seqid;
3176 p->arg.stateid = &lsp->ls_stateid;
3177 p->lsp = lsp;
3178 atomic_inc(&lsp->ls_count);
3179 /* Ensure we don't close file until we're done freeing locks! */
3180 p->ctx = get_nfs_open_context(ctx);
3181 memcpy(&p->fl, fl, sizeof(p->fl));
3182 p->server = NFS_SERVER(inode);
3183 return p;
3184}
3185
3186static void nfs4_locku_release_calldata(void *data)
3187{
3188 struct nfs4_unlockdata *calldata = data;
3189 nfs_free_seqid(calldata->arg.seqid);
3190 nfs4_put_lock_state(calldata->lsp);
3191 put_nfs_open_context(calldata->ctx);
3192 kfree(calldata);
3193}
3194
3195static void nfs4_locku_done(struct rpc_task *task, void *data)
3196{
3197 struct nfs4_unlockdata *calldata = data;
3198
3199 if (RPC_ASSASSINATED(task))
3200 return;
3201 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3202 switch (task->tk_status) {
3203 case 0:
3204 memcpy(calldata->lsp->ls_stateid.data,
3205 calldata->res.stateid.data,
3206 sizeof(calldata->lsp->ls_stateid.data));
3207 renew_lease(calldata->server, calldata->timestamp);
3208 break;
3209 case -NFS4ERR_STALE_STATEID:
3210 case -NFS4ERR_EXPIRED:
3211 break;
3212 default:
3213 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3214 rpc_restart_call(task);
3215 }
3216}
3217
3218static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3219{
3220 struct nfs4_unlockdata *calldata = data;
3221 struct rpc_message msg = {
3222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3223 .rpc_argp = &calldata->arg,
3224 .rpc_resp = &calldata->res,
3225 .rpc_cred = calldata->lsp->ls_state->owner->so_cred,
3226 };
3227
3228 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3229 return;
3230 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3231 /* Note: exit _without_ running nfs4_locku_done */
3232 task->tk_action = NULL;
3233 return;
3234 }
3235 calldata->timestamp = jiffies;
3236 rpc_call_setup(task, &msg, 0);
3237}
3238
3239static const struct rpc_call_ops nfs4_locku_ops = {
3240 .rpc_call_prepare = nfs4_locku_prepare,
3241 .rpc_call_done = nfs4_locku_done,
3242 .rpc_release = nfs4_locku_release_calldata,
3243};
3244
3245static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3246 struct nfs_open_context *ctx,
3247 struct nfs4_lock_state *lsp,
3248 struct nfs_seqid *seqid)
3249{
3250 struct nfs4_unlockdata *data;
3251
3252 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3253 if (data == NULL) {
3254 nfs_free_seqid(seqid);
3255 return ERR_PTR(-ENOMEM);
3256 }
3257
3258 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3259}
3260
3261static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3262{
3263 struct nfs_seqid *seqid;
3264 struct nfs4_lock_state *lsp;
3265 struct rpc_task *task;
3266 int status = 0;
3267
3268 status = nfs4_set_lock_state(state, request);
3269 /* Unlock _before_ we do the RPC call */
3270 request->fl_flags |= FL_EXISTS;
3271 if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3272 goto out;
3273 if (status != 0)
3274 goto out;
3275 /* Is this a delegated lock? */
3276 if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3277 goto out;
3278 lsp = request->fl_u.nfs4_fl.owner;
3279 seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3280 status = -ENOMEM;
3281 if (seqid == NULL)
3282 goto out;
3283 task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3284 status = PTR_ERR(task);
3285 if (IS_ERR(task))
3286 goto out;
3287 status = nfs4_wait_for_completion_rpc_task(task);
3288 rpc_put_task(task);
3289out:
3290 return status;
3291}
3292
3293struct nfs4_lockdata {
3294 struct nfs_lock_args arg;
3295 struct nfs_lock_res res;
3296 struct nfs4_lock_state *lsp;
3297 struct nfs_open_context *ctx;
3298 struct file_lock fl;
3299 unsigned long timestamp;
3300 int rpc_status;
3301 int cancelled;
3302};
3303
3304static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3305 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3306{
3307 struct nfs4_lockdata *p;
3308 struct inode *inode = lsp->ls_state->inode;
3309 struct nfs_server *server = NFS_SERVER(inode);
3310
3311 p = kzalloc(sizeof(*p), GFP_KERNEL);
3312 if (p == NULL)
3313 return NULL;
3314
3315 p->arg.fh = NFS_FH(inode);
3316 p->arg.fl = &p->fl;
3317 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3318 if (p->arg.lock_seqid == NULL)
3319 goto out_free;
3320 p->arg.lock_stateid = &lsp->ls_stateid;
3321 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3322 p->arg.lock_owner.id = lsp->ls_id.id;
3323 p->lsp = lsp;
3324 atomic_inc(&lsp->ls_count);
3325 p->ctx = get_nfs_open_context(ctx);
3326 memcpy(&p->fl, fl, sizeof(p->fl));
3327 return p;
3328out_free:
3329 kfree(p);
3330 return NULL;
3331}
3332
3333static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3334{
3335 struct nfs4_lockdata *data = calldata;
3336 struct nfs4_state *state = data->lsp->ls_state;
3337 struct nfs4_state_owner *sp = state->owner;
3338 struct rpc_message msg = {
3339 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3340 .rpc_argp = &data->arg,
3341 .rpc_resp = &data->res,
3342 .rpc_cred = sp->so_cred,
3343 };
3344
3345 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3346 return;
3347 dprintk("%s: begin!\n", __FUNCTION__);
3348 /* Do we need to do an open_to_lock_owner? */
3349 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3350 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3351 if (data->arg.open_seqid == NULL) {
3352 data->rpc_status = -ENOMEM;
3353 task->tk_action = NULL;
3354 goto out;
3355 }
3356 data->arg.open_stateid = &state->stateid;
3357 data->arg.new_lock_owner = 1;
3358 }
3359 data->timestamp = jiffies;
3360 rpc_call_setup(task, &msg, 0);
3361out:
3362 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3363}
3364
3365static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3366{
3367 struct nfs4_lockdata *data = calldata;
3368
3369 dprintk("%s: begin!\n", __FUNCTION__);
3370
3371 data->rpc_status = task->tk_status;
3372 if (RPC_ASSASSINATED(task))
3373 goto out;
3374 if (data->arg.new_lock_owner != 0) {
3375 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3376 if (data->rpc_status == 0)
3377 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3378 else
3379 goto out;
3380 }
3381 if (data->rpc_status == 0) {
3382 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3383 sizeof(data->lsp->ls_stateid.data));
3384 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3385 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3386 }
3387 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3388out:
3389 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3390}
3391
3392static void nfs4_lock_release(void *calldata)
3393{
3394 struct nfs4_lockdata *data = calldata;
3395
3396 dprintk("%s: begin!\n", __FUNCTION__);
3397 if (data->arg.open_seqid != NULL)
3398 nfs_free_seqid(data->arg.open_seqid);
3399 if (data->cancelled != 0) {
3400 struct rpc_task *task;
3401 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3402 data->arg.lock_seqid);
3403 if (!IS_ERR(task))
3404 rpc_put_task(task);
3405 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3406 } else
3407 nfs_free_seqid(data->arg.lock_seqid);
3408 nfs4_put_lock_state(data->lsp);
3409 put_nfs_open_context(data->ctx);
3410 kfree(data);
3411 dprintk("%s: done!\n", __FUNCTION__);
3412}
3413
3414static const struct rpc_call_ops nfs4_lock_ops = {
3415 .rpc_call_prepare = nfs4_lock_prepare,
3416 .rpc_call_done = nfs4_lock_done,
3417 .rpc_release = nfs4_lock_release,
3418};
3419
3420static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3421{
3422 struct nfs4_lockdata *data;
3423 struct rpc_task *task;
3424 int ret;
3425
3426 dprintk("%s: begin!\n", __FUNCTION__);
3427 data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3428 fl->fl_u.nfs4_fl.owner);
3429 if (data == NULL)
3430 return -ENOMEM;
3431 if (IS_SETLKW(cmd))
3432 data->arg.block = 1;
3433 if (reclaim != 0)
3434 data->arg.reclaim = 1;
3435 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3436 &nfs4_lock_ops, data);
3437 if (IS_ERR(task))
3438 return PTR_ERR(task);
3439 ret = nfs4_wait_for_completion_rpc_task(task);
3440 if (ret == 0) {
3441 ret = data->rpc_status;
3442 if (ret == -NFS4ERR_DENIED)
3443 ret = -EAGAIN;
3444 } else
3445 data->cancelled = 1;
3446 rpc_put_task(task);
3447 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3448 return ret;
3449}
3450
3451static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3452{
3453 struct nfs_server *server = NFS_SERVER(state->inode);
3454 struct nfs4_exception exception = { };
3455 int err;
3456
3457 do {
3458 /* Cache the lock if possible... */
3459 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3460 return 0;
3461 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3462 if (err != -NFS4ERR_DELAY)
3463 break;
3464 nfs4_handle_exception(server, err, &exception);
3465 } while (exception.retry);
3466 return err;
3467}
3468
3469static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3470{
3471 struct nfs_server *server = NFS_SERVER(state->inode);
3472 struct nfs4_exception exception = { };
3473 int err;
3474
3475 err = nfs4_set_lock_state(state, request);
3476 if (err != 0)
3477 return err;
3478 do {
3479 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3480 return 0;
3481 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3482 if (err != -NFS4ERR_DELAY)
3483 break;
3484 nfs4_handle_exception(server, err, &exception);
3485 } while (exception.retry);
3486 return err;
3487}
3488
3489static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3490{
3491 struct nfs_client *clp = state->owner->so_client;
3492 unsigned char fl_flags = request->fl_flags;
3493 int status;
3494
3495 /* Is this a delegated open? */
3496 status = nfs4_set_lock_state(state, request);
3497 if (status != 0)
3498 goto out;
3499 request->fl_flags |= FL_ACCESS;
3500 status = do_vfs_lock(request->fl_file, request);
3501 if (status < 0)
3502 goto out;
3503 down_read(&clp->cl_sem);
3504 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3505 struct nfs_inode *nfsi = NFS_I(state->inode);
3506 /* Yes: cache locks! */
3507 down_read(&nfsi->rwsem);
3508 /* ...but avoid races with delegation recall... */
3509 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3510 request->fl_flags = fl_flags & ~FL_SLEEP;
3511 status = do_vfs_lock(request->fl_file, request);
3512 up_read(&nfsi->rwsem);
3513 goto out_unlock;
3514 }
3515 up_read(&nfsi->rwsem);
3516 }
3517 status = _nfs4_do_setlk(state, cmd, request, 0);
3518 if (status != 0)
3519 goto out_unlock;
3520 /* Note: we always want to sleep here! */
3521 request->fl_flags = fl_flags | FL_SLEEP;
3522 if (do_vfs_lock(request->fl_file, request) < 0)
3523 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3524out_unlock:
3525 up_read(&clp->cl_sem);
3526out:
3527 request->fl_flags = fl_flags;
3528 return status;
3529}
3530
3531static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3532{
3533 struct nfs4_exception exception = { };
3534 int err;
3535
3536 do {
3537 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3538 _nfs4_proc_setlk(state, cmd, request),
3539 &exception);
3540 } while (exception.retry);
3541 return err;
3542}
3543
3544static int
3545nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3546{
3547 struct nfs_open_context *ctx;
3548 struct nfs4_state *state;
3549 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3550 int status;
3551
3552 /* verify open state */
3553 ctx = (struct nfs_open_context *)filp->private_data;
3554 state = ctx->state;
3555
3556 if (request->fl_start < 0 || request->fl_end < 0)
3557 return -EINVAL;
3558
3559 if (IS_GETLK(cmd))
3560 return nfs4_proc_getlk(state, F_GETLK, request);
3561
3562 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3563 return -EINVAL;
3564
3565 if (request->fl_type == F_UNLCK)
3566 return nfs4_proc_unlck(state, cmd, request);
3567
3568 do {
3569 status = nfs4_proc_setlk(state, cmd, request);
3570 if ((status != -EAGAIN) || IS_SETLK(cmd))
3571 break;
3572 timeout = nfs4_set_lock_task_retry(timeout);
3573 status = -ERESTARTSYS;
3574 if (signalled())
3575 break;
3576 } while(status < 0);
3577 return status;
3578}
3579
3580int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3581{
3582 struct nfs_server *server = NFS_SERVER(state->inode);
3583 struct nfs4_exception exception = { };
3584 int err;
3585
3586 err = nfs4_set_lock_state(state, fl);
3587 if (err != 0)
3588 goto out;
3589 do {
3590 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3591 if (err != -NFS4ERR_DELAY)
3592 break;
3593 err = nfs4_handle_exception(server, err, &exception);
3594 } while (exception.retry);
3595out:
3596 return err;
3597}
3598
3599#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3600
3601int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3602 size_t buflen, int flags)
3603{
3604 struct inode *inode = dentry->d_inode;
3605
3606 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3607 return -EOPNOTSUPP;
3608
3609 if (!S_ISREG(inode->i_mode) &&
3610 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3611 return -EPERM;
3612
3613 return nfs4_proc_set_acl(inode, buf, buflen);
3614}
3615
3616/* The getxattr man page suggests returning -ENODATA for unknown attributes,
3617 * and that's what we'll do for e.g. user attributes that haven't been set.
3618 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3619 * attributes in kernel-managed attribute namespaces. */
3620ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3621 size_t buflen)
3622{
3623 struct inode *inode = dentry->d_inode;
3624
3625 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3626 return -EOPNOTSUPP;
3627
3628 return nfs4_proc_get_acl(inode, buf, buflen);
3629}
3630
3631ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3632{
3633 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3634
3635 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3636 return 0;
3637 if (buf && buflen < len)
3638 return -ERANGE;
3639 if (buf)
3640 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3641 return len;
3642}
3643
3644int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3645 struct nfs4_fs_locations *fs_locations, struct page *page)
3646{
3647 struct nfs_server *server = NFS_SERVER(dir);
3648 u32 bitmask[2] = {
3649 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3650 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3651 };
3652 struct nfs4_fs_locations_arg args = {
3653 .dir_fh = NFS_FH(dir),
3654 .name = name,
3655 .page = page,
3656 .bitmask = bitmask,
3657 };
3658 struct rpc_message msg = {
3659 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3660 .rpc_argp = &args,
3661 .rpc_resp = fs_locations,
3662 };
3663 int status;
3664
3665 dprintk("%s: start\n", __FUNCTION__);
3666 nfs_fattr_init(&fs_locations->fattr);
3667 fs_locations->server = server;
3668 fs_locations->nlocations = 0;
3669 status = rpc_call_sync(server->client, &msg, 0);
3670 dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3671 return status;
3672}
3673
3674struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3675 .recover_open = nfs4_open_reclaim,
3676 .recover_lock = nfs4_lock_reclaim,
3677};
3678
3679struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3680 .recover_open = nfs4_open_expired,
3681 .recover_lock = nfs4_lock_expired,
3682};
3683
3684static const struct inode_operations nfs4_file_inode_operations = {
3685 .permission = nfs_permission,
3686 .getattr = nfs_getattr,
3687 .setattr = nfs_setattr,
3688 .getxattr = nfs4_getxattr,
3689 .setxattr = nfs4_setxattr,
3690 .listxattr = nfs4_listxattr,
3691};
3692
3693const struct nfs_rpc_ops nfs_v4_clientops = {
3694 .version = 4, /* protocol version */
3695 .dentry_ops = &nfs4_dentry_operations,
3696 .dir_inode_ops = &nfs4_dir_inode_operations,
3697 .file_inode_ops = &nfs4_file_inode_operations,
3698 .getroot = nfs4_proc_get_root,
3699 .getattr = nfs4_proc_getattr,
3700 .setattr = nfs4_proc_setattr,
3701 .lookupfh = nfs4_proc_lookupfh,
3702 .lookup = nfs4_proc_lookup,
3703 .access = nfs4_proc_access,
3704 .readlink = nfs4_proc_readlink,
3705 .create = nfs4_proc_create,
3706 .remove = nfs4_proc_remove,
3707 .unlink_setup = nfs4_proc_unlink_setup,
3708 .unlink_done = nfs4_proc_unlink_done,
3709 .rename = nfs4_proc_rename,
3710 .link = nfs4_proc_link,
3711 .symlink = nfs4_proc_symlink,
3712 .mkdir = nfs4_proc_mkdir,
3713 .rmdir = nfs4_proc_remove,
3714 .readdir = nfs4_proc_readdir,
3715 .mknod = nfs4_proc_mknod,
3716 .statfs = nfs4_proc_statfs,
3717 .fsinfo = nfs4_proc_fsinfo,
3718 .pathconf = nfs4_proc_pathconf,
3719 .set_capabilities = nfs4_server_capabilities,
3720 .decode_dirent = nfs4_decode_dirent,
3721 .read_setup = nfs4_proc_read_setup,
3722 .read_done = nfs4_read_done,
3723 .write_setup = nfs4_proc_write_setup,
3724 .write_done = nfs4_write_done,
3725 .commit_setup = nfs4_proc_commit_setup,
3726 .commit_done = nfs4_commit_done,
3727 .file_open = nfs_open,
3728 .file_release = nfs_release,
3729 .lock = nfs4_proc_lock,
3730 .clear_acl_cache = nfs4_zap_acl_attr,
3731};
3732
3733/*
3734 * Local variables:
3735 * c-basic-offset: 8
3736 * End:
3737 */
Linux 6.x block layer and io_uring tree(s)