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NFSv4.1: Ensure memory ordering between nfs4_ds_connect and nfs4_fl_prepare_ds
[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/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/ratelimit.h>
43#include <linux/printk.h>
44#include <linux/slab.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/nfs.h>
47#include <linux/nfs4.h>
48#include <linux/nfs_fs.h>
49#include <linux/nfs_page.h>
50#include <linux/nfs_mount.h>
51#include <linux/namei.h>
52#include <linux/mount.h>
53#include <linux/module.h>
54#include <linux/nfs_idmap.h>
55#include <linux/xattr.h>
56#include <linux/utsname.h>
57#include <linux/freezer.h>
58
59#include "nfs4_fs.h"
60#include "delegation.h"
61#include "internal.h"
62#include "iostat.h"
63#include "callback.h"
64#include "pnfs.h"
65#include "netns.h"
66#include "nfs4session.h"
67#include "fscache.h"
68
69#include "nfs4trace.h"
70
71#define NFSDBG_FACILITY NFSDBG_PROC
72
73#define NFS4_POLL_RETRY_MIN (HZ/10)
74#define NFS4_POLL_RETRY_MAX (15*HZ)
75
76struct nfs4_opendata;
77static int _nfs4_proc_open(struct nfs4_opendata *data);
78static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
79static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
80static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
81static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
82static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
83static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
84static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
85 struct nfs_fattr *fattr, struct iattr *sattr,
86 struct nfs4_state *state, struct nfs4_label *ilabel,
87 struct nfs4_label *olabel);
88#ifdef CONFIG_NFS_V4_1
89static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
90 struct rpc_cred *);
91static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
92 struct rpc_cred *);
93#endif
94
95#ifdef CONFIG_NFS_V4_SECURITY_LABEL
96static inline struct nfs4_label *
97nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
98 struct iattr *sattr, struct nfs4_label *label)
99{
100 int err;
101
102 if (label == NULL)
103 return NULL;
104
105 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
106 return NULL;
107
108 if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
109 return NULL;
110
111 err = security_dentry_init_security(dentry, sattr->ia_mode,
112 &dentry->d_name, (void **)&label->label, &label->len);
113 if (err == 0)
114 return label;
115
116 return NULL;
117}
118static inline void
119nfs4_label_release_security(struct nfs4_label *label)
120{
121 if (label)
122 security_release_secctx(label->label, label->len);
123}
124static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
125{
126 if (label)
127 return server->attr_bitmask;
128
129 return server->attr_bitmask_nl;
130}
131#else
132static inline struct nfs4_label *
133nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
134 struct iattr *sattr, struct nfs4_label *l)
135{ return NULL; }
136static inline void
137nfs4_label_release_security(struct nfs4_label *label)
138{ return; }
139static inline u32 *
140nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
141{ return server->attr_bitmask; }
142#endif
143
144/* Prevent leaks of NFSv4 errors into userland */
145static int nfs4_map_errors(int err)
146{
147 if (err >= -1000)
148 return err;
149 switch (err) {
150 case -NFS4ERR_RESOURCE:
151 case -NFS4ERR_LAYOUTTRYLATER:
152 case -NFS4ERR_RECALLCONFLICT:
153 return -EREMOTEIO;
154 case -NFS4ERR_WRONGSEC:
155 case -NFS4ERR_WRONG_CRED:
156 return -EPERM;
157 case -NFS4ERR_BADOWNER:
158 case -NFS4ERR_BADNAME:
159 return -EINVAL;
160 case -NFS4ERR_SHARE_DENIED:
161 return -EACCES;
162 case -NFS4ERR_MINOR_VERS_MISMATCH:
163 return -EPROTONOSUPPORT;
164 case -NFS4ERR_ACCESS:
165 return -EACCES;
166 case -NFS4ERR_FILE_OPEN:
167 return -EBUSY;
168 default:
169 dprintk("%s could not handle NFSv4 error %d\n",
170 __func__, -err);
171 break;
172 }
173 return -EIO;
174}
175
176/*
177 * This is our standard bitmap for GETATTR requests.
178 */
179const u32 nfs4_fattr_bitmap[3] = {
180 FATTR4_WORD0_TYPE
181 | FATTR4_WORD0_CHANGE
182 | FATTR4_WORD0_SIZE
183 | FATTR4_WORD0_FSID
184 | FATTR4_WORD0_FILEID,
185 FATTR4_WORD1_MODE
186 | FATTR4_WORD1_NUMLINKS
187 | FATTR4_WORD1_OWNER
188 | FATTR4_WORD1_OWNER_GROUP
189 | FATTR4_WORD1_RAWDEV
190 | FATTR4_WORD1_SPACE_USED
191 | FATTR4_WORD1_TIME_ACCESS
192 | FATTR4_WORD1_TIME_METADATA
193 | FATTR4_WORD1_TIME_MODIFY,
194#ifdef CONFIG_NFS_V4_SECURITY_LABEL
195 FATTR4_WORD2_SECURITY_LABEL
196#endif
197};
198
199static const u32 nfs4_pnfs_open_bitmap[3] = {
200 FATTR4_WORD0_TYPE
201 | FATTR4_WORD0_CHANGE
202 | FATTR4_WORD0_SIZE
203 | FATTR4_WORD0_FSID
204 | FATTR4_WORD0_FILEID,
205 FATTR4_WORD1_MODE
206 | FATTR4_WORD1_NUMLINKS
207 | FATTR4_WORD1_OWNER
208 | FATTR4_WORD1_OWNER_GROUP
209 | FATTR4_WORD1_RAWDEV
210 | FATTR4_WORD1_SPACE_USED
211 | FATTR4_WORD1_TIME_ACCESS
212 | FATTR4_WORD1_TIME_METADATA
213 | FATTR4_WORD1_TIME_MODIFY,
214 FATTR4_WORD2_MDSTHRESHOLD
215};
216
217static const u32 nfs4_open_noattr_bitmap[3] = {
218 FATTR4_WORD0_TYPE
219 | FATTR4_WORD0_CHANGE
220 | FATTR4_WORD0_FILEID,
221};
222
223const u32 nfs4_statfs_bitmap[3] = {
224 FATTR4_WORD0_FILES_AVAIL
225 | FATTR4_WORD0_FILES_FREE
226 | FATTR4_WORD0_FILES_TOTAL,
227 FATTR4_WORD1_SPACE_AVAIL
228 | FATTR4_WORD1_SPACE_FREE
229 | FATTR4_WORD1_SPACE_TOTAL
230};
231
232const u32 nfs4_pathconf_bitmap[3] = {
233 FATTR4_WORD0_MAXLINK
234 | FATTR4_WORD0_MAXNAME,
235 0
236};
237
238const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
239 | FATTR4_WORD0_MAXREAD
240 | FATTR4_WORD0_MAXWRITE
241 | FATTR4_WORD0_LEASE_TIME,
242 FATTR4_WORD1_TIME_DELTA
243 | FATTR4_WORD1_FS_LAYOUT_TYPES,
244 FATTR4_WORD2_LAYOUT_BLKSIZE
245};
246
247const u32 nfs4_fs_locations_bitmap[3] = {
248 FATTR4_WORD0_TYPE
249 | FATTR4_WORD0_CHANGE
250 | FATTR4_WORD0_SIZE
251 | FATTR4_WORD0_FSID
252 | FATTR4_WORD0_FILEID
253 | FATTR4_WORD0_FS_LOCATIONS,
254 FATTR4_WORD1_MODE
255 | FATTR4_WORD1_NUMLINKS
256 | FATTR4_WORD1_OWNER
257 | FATTR4_WORD1_OWNER_GROUP
258 | FATTR4_WORD1_RAWDEV
259 | FATTR4_WORD1_SPACE_USED
260 | FATTR4_WORD1_TIME_ACCESS
261 | FATTR4_WORD1_TIME_METADATA
262 | FATTR4_WORD1_TIME_MODIFY
263 | FATTR4_WORD1_MOUNTED_ON_FILEID,
264};
265
266static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
267 struct nfs4_readdir_arg *readdir)
268{
269 __be32 *start, *p;
270
271 if (cookie > 2) {
272 readdir->cookie = cookie;
273 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
274 return;
275 }
276
277 readdir->cookie = 0;
278 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
279 if (cookie == 2)
280 return;
281
282 /*
283 * NFSv4 servers do not return entries for '.' and '..'
284 * Therefore, we fake these entries here. We let '.'
285 * have cookie 0 and '..' have cookie 1. Note that
286 * when talking to the server, we always send cookie 0
287 * instead of 1 or 2.
288 */
289 start = p = kmap_atomic(*readdir->pages);
290
291 if (cookie == 0) {
292 *p++ = xdr_one; /* next */
293 *p++ = xdr_zero; /* cookie, first word */
294 *p++ = xdr_one; /* cookie, second word */
295 *p++ = xdr_one; /* entry len */
296 memcpy(p, ".\0\0\0", 4); /* entry */
297 p++;
298 *p++ = xdr_one; /* bitmap length */
299 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
300 *p++ = htonl(8); /* attribute buffer length */
301 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
302 }
303
304 *p++ = xdr_one; /* next */
305 *p++ = xdr_zero; /* cookie, first word */
306 *p++ = xdr_two; /* cookie, second word */
307 *p++ = xdr_two; /* entry len */
308 memcpy(p, "..\0\0", 4); /* entry */
309 p++;
310 *p++ = xdr_one; /* bitmap length */
311 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
312 *p++ = htonl(8); /* attribute buffer length */
313 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
314
315 readdir->pgbase = (char *)p - (char *)start;
316 readdir->count -= readdir->pgbase;
317 kunmap_atomic(start);
318}
319
320static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
321{
322 int res = 0;
323
324 might_sleep();
325
326 if (*timeout <= 0)
327 *timeout = NFS4_POLL_RETRY_MIN;
328 if (*timeout > NFS4_POLL_RETRY_MAX)
329 *timeout = NFS4_POLL_RETRY_MAX;
330 freezable_schedule_timeout_killable_unsafe(*timeout);
331 if (fatal_signal_pending(current))
332 res = -ERESTARTSYS;
333 *timeout <<= 1;
334 return res;
335}
336
337/* This is the error handling routine for processes that are allowed
338 * to sleep.
339 */
340static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
341{
342 struct nfs_client *clp = server->nfs_client;
343 struct nfs4_state *state = exception->state;
344 struct inode *inode = exception->inode;
345 int ret = errorcode;
346
347 exception->retry = 0;
348 switch(errorcode) {
349 case 0:
350 return 0;
351 case -NFS4ERR_OPENMODE:
352 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
353 nfs4_inode_return_delegation(inode);
354 exception->retry = 1;
355 return 0;
356 }
357 if (state == NULL)
358 break;
359 ret = nfs4_schedule_stateid_recovery(server, state);
360 if (ret < 0)
361 break;
362 goto wait_on_recovery;
363 case -NFS4ERR_DELEG_REVOKED:
364 case -NFS4ERR_ADMIN_REVOKED:
365 case -NFS4ERR_BAD_STATEID:
366 if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
367 nfs_remove_bad_delegation(inode);
368 exception->retry = 1;
369 break;
370 }
371 if (state == NULL)
372 break;
373 ret = nfs4_schedule_stateid_recovery(server, state);
374 if (ret < 0)
375 break;
376 goto wait_on_recovery;
377 case -NFS4ERR_EXPIRED:
378 if (state != NULL) {
379 ret = nfs4_schedule_stateid_recovery(server, state);
380 if (ret < 0)
381 break;
382 }
383 case -NFS4ERR_STALE_STATEID:
384 case -NFS4ERR_STALE_CLIENTID:
385 nfs4_schedule_lease_recovery(clp);
386 goto wait_on_recovery;
387#if defined(CONFIG_NFS_V4_1)
388 case -NFS4ERR_BADSESSION:
389 case -NFS4ERR_BADSLOT:
390 case -NFS4ERR_BAD_HIGH_SLOT:
391 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
392 case -NFS4ERR_DEADSESSION:
393 case -NFS4ERR_SEQ_FALSE_RETRY:
394 case -NFS4ERR_SEQ_MISORDERED:
395 dprintk("%s ERROR: %d Reset session\n", __func__,
396 errorcode);
397 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
398 goto wait_on_recovery;
399#endif /* defined(CONFIG_NFS_V4_1) */
400 case -NFS4ERR_FILE_OPEN:
401 if (exception->timeout > HZ) {
402 /* We have retried a decent amount, time to
403 * fail
404 */
405 ret = -EBUSY;
406 break;
407 }
408 case -NFS4ERR_GRACE:
409 case -NFS4ERR_DELAY:
410 ret = nfs4_delay(server->client, &exception->timeout);
411 if (ret != 0)
412 break;
413 case -NFS4ERR_RETRY_UNCACHED_REP:
414 case -NFS4ERR_OLD_STATEID:
415 exception->retry = 1;
416 break;
417 case -NFS4ERR_BADOWNER:
418 /* The following works around a Linux server bug! */
419 case -NFS4ERR_BADNAME:
420 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
421 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
422 exception->retry = 1;
423 printk(KERN_WARNING "NFS: v4 server %s "
424 "does not accept raw "
425 "uid/gids. "
426 "Reenabling the idmapper.\n",
427 server->nfs_client->cl_hostname);
428 }
429 }
430 /* We failed to handle the error */
431 return nfs4_map_errors(ret);
432wait_on_recovery:
433 ret = nfs4_wait_clnt_recover(clp);
434 if (ret == 0)
435 exception->retry = 1;
436 return ret;
437}
438
439/*
440 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
441 * or 'false' otherwise.
442 */
443static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
444{
445 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
446
447 if (flavor == RPC_AUTH_GSS_KRB5I ||
448 flavor == RPC_AUTH_GSS_KRB5P)
449 return true;
450
451 return false;
452}
453
454static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
455{
456 spin_lock(&clp->cl_lock);
457 if (time_before(clp->cl_last_renewal,timestamp))
458 clp->cl_last_renewal = timestamp;
459 spin_unlock(&clp->cl_lock);
460}
461
462static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
463{
464 do_renew_lease(server->nfs_client, timestamp);
465}
466
467struct nfs4_call_sync_data {
468 const struct nfs_server *seq_server;
469 struct nfs4_sequence_args *seq_args;
470 struct nfs4_sequence_res *seq_res;
471};
472
473static void nfs4_init_sequence(struct nfs4_sequence_args *args,
474 struct nfs4_sequence_res *res, int cache_reply)
475{
476 args->sa_slot = NULL;
477 args->sa_cache_this = cache_reply;
478 args->sa_privileged = 0;
479
480 res->sr_slot = NULL;
481}
482
483static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
484{
485 args->sa_privileged = 1;
486}
487
488static int nfs40_setup_sequence(const struct nfs_server *server,
489 struct nfs4_sequence_args *args,
490 struct nfs4_sequence_res *res,
491 struct rpc_task *task)
492{
493 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
494 struct nfs4_slot *slot;
495
496 /* slot already allocated? */
497 if (res->sr_slot != NULL)
498 goto out_start;
499
500 spin_lock(&tbl->slot_tbl_lock);
501 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
502 goto out_sleep;
503
504 slot = nfs4_alloc_slot(tbl);
505 if (IS_ERR(slot)) {
506 if (slot == ERR_PTR(-ENOMEM))
507 task->tk_timeout = HZ >> 2;
508 goto out_sleep;
509 }
510 spin_unlock(&tbl->slot_tbl_lock);
511
512 args->sa_slot = slot;
513 res->sr_slot = slot;
514
515out_start:
516 rpc_call_start(task);
517 return 0;
518
519out_sleep:
520 if (args->sa_privileged)
521 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
522 NULL, RPC_PRIORITY_PRIVILEGED);
523 else
524 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
525 spin_unlock(&tbl->slot_tbl_lock);
526 return -EAGAIN;
527}
528
529static int nfs40_sequence_done(struct rpc_task *task,
530 struct nfs4_sequence_res *res)
531{
532 struct nfs4_slot *slot = res->sr_slot;
533 struct nfs4_slot_table *tbl;
534
535 if (!RPC_WAS_SENT(task))
536 goto out;
537
538 tbl = slot->table;
539 spin_lock(&tbl->slot_tbl_lock);
540 if (!nfs41_wake_and_assign_slot(tbl, slot))
541 nfs4_free_slot(tbl, slot);
542 spin_unlock(&tbl->slot_tbl_lock);
543
544 res->sr_slot = NULL;
545out:
546 return 1;
547}
548
549#if defined(CONFIG_NFS_V4_1)
550
551static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
552{
553 struct nfs4_session *session;
554 struct nfs4_slot_table *tbl;
555 bool send_new_highest_used_slotid = false;
556
557 if (!res->sr_slot) {
558 /* just wake up the next guy waiting since
559 * we may have not consumed a slot after all */
560 dprintk("%s: No slot\n", __func__);
561 return;
562 }
563 tbl = res->sr_slot->table;
564 session = tbl->session;
565
566 spin_lock(&tbl->slot_tbl_lock);
567 /* Be nice to the server: try to ensure that the last transmitted
568 * value for highest_user_slotid <= target_highest_slotid
569 */
570 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
571 send_new_highest_used_slotid = true;
572
573 if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
574 send_new_highest_used_slotid = false;
575 goto out_unlock;
576 }
577 nfs4_free_slot(tbl, res->sr_slot);
578
579 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
580 send_new_highest_used_slotid = false;
581out_unlock:
582 spin_unlock(&tbl->slot_tbl_lock);
583 res->sr_slot = NULL;
584 if (send_new_highest_used_slotid)
585 nfs41_server_notify_highest_slotid_update(session->clp);
586}
587
588static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
589{
590 struct nfs4_session *session;
591 struct nfs4_slot *slot;
592 struct nfs_client *clp;
593 bool interrupted = false;
594 int ret = 1;
595
596 /* don't increment the sequence number if the task wasn't sent */
597 if (!RPC_WAS_SENT(task))
598 goto out;
599
600 slot = res->sr_slot;
601 session = slot->table->session;
602
603 if (slot->interrupted) {
604 slot->interrupted = 0;
605 interrupted = true;
606 }
607
608 trace_nfs4_sequence_done(session, res);
609 /* Check the SEQUENCE operation status */
610 switch (res->sr_status) {
611 case 0:
612 /* Update the slot's sequence and clientid lease timer */
613 ++slot->seq_nr;
614 clp = session->clp;
615 do_renew_lease(clp, res->sr_timestamp);
616 /* Check sequence flags */
617 if (res->sr_status_flags != 0)
618 nfs4_schedule_lease_recovery(clp);
619 nfs41_update_target_slotid(slot->table, slot, res);
620 break;
621 case 1:
622 /*
623 * sr_status remains 1 if an RPC level error occurred.
624 * The server may or may not have processed the sequence
625 * operation..
626 * Mark the slot as having hosted an interrupted RPC call.
627 */
628 slot->interrupted = 1;
629 goto out;
630 case -NFS4ERR_DELAY:
631 /* The server detected a resend of the RPC call and
632 * returned NFS4ERR_DELAY as per Section 2.10.6.2
633 * of RFC5661.
634 */
635 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
636 __func__,
637 slot->slot_nr,
638 slot->seq_nr);
639 goto out_retry;
640 case -NFS4ERR_BADSLOT:
641 /*
642 * The slot id we used was probably retired. Try again
643 * using a different slot id.
644 */
645 goto retry_nowait;
646 case -NFS4ERR_SEQ_MISORDERED:
647 /*
648 * Was the last operation on this sequence interrupted?
649 * If so, retry after bumping the sequence number.
650 */
651 if (interrupted) {
652 ++slot->seq_nr;
653 goto retry_nowait;
654 }
655 /*
656 * Could this slot have been previously retired?
657 * If so, then the server may be expecting seq_nr = 1!
658 */
659 if (slot->seq_nr != 1) {
660 slot->seq_nr = 1;
661 goto retry_nowait;
662 }
663 break;
664 case -NFS4ERR_SEQ_FALSE_RETRY:
665 ++slot->seq_nr;
666 goto retry_nowait;
667 default:
668 /* Just update the slot sequence no. */
669 ++slot->seq_nr;
670 }
671out:
672 /* The session may be reset by one of the error handlers. */
673 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
674 nfs41_sequence_free_slot(res);
675 return ret;
676retry_nowait:
677 if (rpc_restart_call_prepare(task)) {
678 task->tk_status = 0;
679 ret = 0;
680 }
681 goto out;
682out_retry:
683 if (!rpc_restart_call(task))
684 goto out;
685 rpc_delay(task, NFS4_POLL_RETRY_MAX);
686 return 0;
687}
688
689static int nfs4_sequence_done(struct rpc_task *task,
690 struct nfs4_sequence_res *res)
691{
692 if (res->sr_slot == NULL)
693 return 1;
694 if (!res->sr_slot->table->session)
695 return nfs40_sequence_done(task, res);
696 return nfs41_sequence_done(task, res);
697}
698
699int nfs41_setup_sequence(struct nfs4_session *session,
700 struct nfs4_sequence_args *args,
701 struct nfs4_sequence_res *res,
702 struct rpc_task *task)
703{
704 struct nfs4_slot *slot;
705 struct nfs4_slot_table *tbl;
706
707 dprintk("--> %s\n", __func__);
708 /* slot already allocated? */
709 if (res->sr_slot != NULL)
710 goto out_success;
711
712 tbl = &session->fc_slot_table;
713
714 task->tk_timeout = 0;
715
716 spin_lock(&tbl->slot_tbl_lock);
717 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
718 !args->sa_privileged) {
719 /* The state manager will wait until the slot table is empty */
720 dprintk("%s session is draining\n", __func__);
721 goto out_sleep;
722 }
723
724 slot = nfs4_alloc_slot(tbl);
725 if (IS_ERR(slot)) {
726 /* If out of memory, try again in 1/4 second */
727 if (slot == ERR_PTR(-ENOMEM))
728 task->tk_timeout = HZ >> 2;
729 dprintk("<-- %s: no free slots\n", __func__);
730 goto out_sleep;
731 }
732 spin_unlock(&tbl->slot_tbl_lock);
733
734 args->sa_slot = slot;
735
736 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
737 slot->slot_nr, slot->seq_nr);
738
739 res->sr_slot = slot;
740 res->sr_timestamp = jiffies;
741 res->sr_status_flags = 0;
742 /*
743 * sr_status is only set in decode_sequence, and so will remain
744 * set to 1 if an rpc level failure occurs.
745 */
746 res->sr_status = 1;
747 trace_nfs4_setup_sequence(session, args);
748out_success:
749 rpc_call_start(task);
750 return 0;
751out_sleep:
752 /* Privileged tasks are queued with top priority */
753 if (args->sa_privileged)
754 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
755 NULL, RPC_PRIORITY_PRIVILEGED);
756 else
757 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
758 spin_unlock(&tbl->slot_tbl_lock);
759 return -EAGAIN;
760}
761EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
762
763static int nfs4_setup_sequence(const struct nfs_server *server,
764 struct nfs4_sequence_args *args,
765 struct nfs4_sequence_res *res,
766 struct rpc_task *task)
767{
768 struct nfs4_session *session = nfs4_get_session(server);
769 int ret = 0;
770
771 if (!session)
772 return nfs40_setup_sequence(server, args, res, task);
773
774 dprintk("--> %s clp %p session %p sr_slot %u\n",
775 __func__, session->clp, session, res->sr_slot ?
776 res->sr_slot->slot_nr : NFS4_NO_SLOT);
777
778 ret = nfs41_setup_sequence(session, args, res, task);
779
780 dprintk("<-- %s status=%d\n", __func__, ret);
781 return ret;
782}
783
784static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
785{
786 struct nfs4_call_sync_data *data = calldata;
787 struct nfs4_session *session = nfs4_get_session(data->seq_server);
788
789 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
790
791 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
792}
793
794static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
795{
796 struct nfs4_call_sync_data *data = calldata;
797
798 nfs41_sequence_done(task, data->seq_res);
799}
800
801static const struct rpc_call_ops nfs41_call_sync_ops = {
802 .rpc_call_prepare = nfs41_call_sync_prepare,
803 .rpc_call_done = nfs41_call_sync_done,
804};
805
806#else /* !CONFIG_NFS_V4_1 */
807
808static int nfs4_setup_sequence(const struct nfs_server *server,
809 struct nfs4_sequence_args *args,
810 struct nfs4_sequence_res *res,
811 struct rpc_task *task)
812{
813 return nfs40_setup_sequence(server, args, res, task);
814}
815
816static int nfs4_sequence_done(struct rpc_task *task,
817 struct nfs4_sequence_res *res)
818{
819 return nfs40_sequence_done(task, res);
820}
821
822#endif /* !CONFIG_NFS_V4_1 */
823
824static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
825{
826 struct nfs4_call_sync_data *data = calldata;
827 nfs4_setup_sequence(data->seq_server,
828 data->seq_args, data->seq_res, task);
829}
830
831static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
832{
833 struct nfs4_call_sync_data *data = calldata;
834 nfs4_sequence_done(task, data->seq_res);
835}
836
837static const struct rpc_call_ops nfs40_call_sync_ops = {
838 .rpc_call_prepare = nfs40_call_sync_prepare,
839 .rpc_call_done = nfs40_call_sync_done,
840};
841
842static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
843 struct nfs_server *server,
844 struct rpc_message *msg,
845 struct nfs4_sequence_args *args,
846 struct nfs4_sequence_res *res)
847{
848 int ret;
849 struct rpc_task *task;
850 struct nfs_client *clp = server->nfs_client;
851 struct nfs4_call_sync_data data = {
852 .seq_server = server,
853 .seq_args = args,
854 .seq_res = res,
855 };
856 struct rpc_task_setup task_setup = {
857 .rpc_client = clnt,
858 .rpc_message = msg,
859 .callback_ops = clp->cl_mvops->call_sync_ops,
860 .callback_data = &data
861 };
862
863 task = rpc_run_task(&task_setup);
864 if (IS_ERR(task))
865 ret = PTR_ERR(task);
866 else {
867 ret = task->tk_status;
868 rpc_put_task(task);
869 }
870 return ret;
871}
872
873static
874int nfs4_call_sync(struct rpc_clnt *clnt,
875 struct nfs_server *server,
876 struct rpc_message *msg,
877 struct nfs4_sequence_args *args,
878 struct nfs4_sequence_res *res,
879 int cache_reply)
880{
881 nfs4_init_sequence(args, res, cache_reply);
882 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
883}
884
885static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
886{
887 struct nfs_inode *nfsi = NFS_I(dir);
888
889 spin_lock(&dir->i_lock);
890 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
891 if (!cinfo->atomic || cinfo->before != dir->i_version)
892 nfs_force_lookup_revalidate(dir);
893 dir->i_version = cinfo->after;
894 nfs_fscache_invalidate(dir);
895 spin_unlock(&dir->i_lock);
896}
897
898struct nfs4_opendata {
899 struct kref kref;
900 struct nfs_openargs o_arg;
901 struct nfs_openres o_res;
902 struct nfs_open_confirmargs c_arg;
903 struct nfs_open_confirmres c_res;
904 struct nfs4_string owner_name;
905 struct nfs4_string group_name;
906 struct nfs_fattr f_attr;
907 struct nfs4_label *f_label;
908 struct dentry *dir;
909 struct dentry *dentry;
910 struct nfs4_state_owner *owner;
911 struct nfs4_state *state;
912 struct iattr attrs;
913 unsigned long timestamp;
914 unsigned int rpc_done : 1;
915 unsigned int file_created : 1;
916 unsigned int is_recover : 1;
917 int rpc_status;
918 int cancelled;
919};
920
921static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
922 int err, struct nfs4_exception *exception)
923{
924 if (err != -EINVAL)
925 return false;
926 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
927 return false;
928 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
929 exception->retry = 1;
930 return true;
931}
932
933static enum open_claim_type4
934nfs4_map_atomic_open_claim(struct nfs_server *server,
935 enum open_claim_type4 claim)
936{
937 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
938 return claim;
939 switch (claim) {
940 default:
941 return claim;
942 case NFS4_OPEN_CLAIM_FH:
943 return NFS4_OPEN_CLAIM_NULL;
944 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
945 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
946 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
947 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
948 }
949}
950
951static void nfs4_init_opendata_res(struct nfs4_opendata *p)
952{
953 p->o_res.f_attr = &p->f_attr;
954 p->o_res.f_label = p->f_label;
955 p->o_res.seqid = p->o_arg.seqid;
956 p->c_res.seqid = p->c_arg.seqid;
957 p->o_res.server = p->o_arg.server;
958 p->o_res.access_request = p->o_arg.access;
959 nfs_fattr_init(&p->f_attr);
960 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
961}
962
963static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
964 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
965 const struct iattr *attrs,
966 struct nfs4_label *label,
967 enum open_claim_type4 claim,
968 gfp_t gfp_mask)
969{
970 struct dentry *parent = dget_parent(dentry);
971 struct inode *dir = parent->d_inode;
972 struct nfs_server *server = NFS_SERVER(dir);
973 struct nfs4_opendata *p;
974
975 p = kzalloc(sizeof(*p), gfp_mask);
976 if (p == NULL)
977 goto err;
978
979 p->f_label = nfs4_label_alloc(server, gfp_mask);
980 if (IS_ERR(p->f_label))
981 goto err_free_p;
982
983 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
984 if (p->o_arg.seqid == NULL)
985 goto err_free_label;
986 nfs_sb_active(dentry->d_sb);
987 p->dentry = dget(dentry);
988 p->dir = parent;
989 p->owner = sp;
990 atomic_inc(&sp->so_count);
991 p->o_arg.open_flags = flags;
992 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
993 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
994 * will return permission denied for all bits until close */
995 if (!(flags & O_EXCL)) {
996 /* ask server to check for all possible rights as results
997 * are cached */
998 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
999 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1000 }
1001 p->o_arg.clientid = server->nfs_client->cl_clientid;
1002 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1003 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1004 p->o_arg.name = &dentry->d_name;
1005 p->o_arg.server = server;
1006 p->o_arg.bitmask = nfs4_bitmask(server, label);
1007 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1008 p->o_arg.label = label;
1009 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1010 switch (p->o_arg.claim) {
1011 case NFS4_OPEN_CLAIM_NULL:
1012 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1013 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1014 p->o_arg.fh = NFS_FH(dir);
1015 break;
1016 case NFS4_OPEN_CLAIM_PREVIOUS:
1017 case NFS4_OPEN_CLAIM_FH:
1018 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1019 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1020 p->o_arg.fh = NFS_FH(dentry->d_inode);
1021 }
1022 if (attrs != NULL && attrs->ia_valid != 0) {
1023 __u32 verf[2];
1024
1025 p->o_arg.u.attrs = &p->attrs;
1026 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1027
1028 verf[0] = jiffies;
1029 verf[1] = current->pid;
1030 memcpy(p->o_arg.u.verifier.data, verf,
1031 sizeof(p->o_arg.u.verifier.data));
1032 }
1033 p->c_arg.fh = &p->o_res.fh;
1034 p->c_arg.stateid = &p->o_res.stateid;
1035 p->c_arg.seqid = p->o_arg.seqid;
1036 nfs4_init_opendata_res(p);
1037 kref_init(&p->kref);
1038 return p;
1039
1040err_free_label:
1041 nfs4_label_free(p->f_label);
1042err_free_p:
1043 kfree(p);
1044err:
1045 dput(parent);
1046 return NULL;
1047}
1048
1049static void nfs4_opendata_free(struct kref *kref)
1050{
1051 struct nfs4_opendata *p = container_of(kref,
1052 struct nfs4_opendata, kref);
1053 struct super_block *sb = p->dentry->d_sb;
1054
1055 nfs_free_seqid(p->o_arg.seqid);
1056 if (p->state != NULL)
1057 nfs4_put_open_state(p->state);
1058 nfs4_put_state_owner(p->owner);
1059
1060 nfs4_label_free(p->f_label);
1061
1062 dput(p->dir);
1063 dput(p->dentry);
1064 nfs_sb_deactive(sb);
1065 nfs_fattr_free_names(&p->f_attr);
1066 kfree(p);
1067}
1068
1069static void nfs4_opendata_put(struct nfs4_opendata *p)
1070{
1071 if (p != NULL)
1072 kref_put(&p->kref, nfs4_opendata_free);
1073}
1074
1075static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1076{
1077 int ret;
1078
1079 ret = rpc_wait_for_completion_task(task);
1080 return ret;
1081}
1082
1083static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1084{
1085 int ret = 0;
1086
1087 if (open_mode & (O_EXCL|O_TRUNC))
1088 goto out;
1089 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1090 case FMODE_READ:
1091 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1092 && state->n_rdonly != 0;
1093 break;
1094 case FMODE_WRITE:
1095 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1096 && state->n_wronly != 0;
1097 break;
1098 case FMODE_READ|FMODE_WRITE:
1099 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1100 && state->n_rdwr != 0;
1101 }
1102out:
1103 return ret;
1104}
1105
1106static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1107{
1108 if (delegation == NULL)
1109 return 0;
1110 if ((delegation->type & fmode) != fmode)
1111 return 0;
1112 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1113 return 0;
1114 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1115 return 0;
1116 nfs_mark_delegation_referenced(delegation);
1117 return 1;
1118}
1119
1120static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1121{
1122 switch (fmode) {
1123 case FMODE_WRITE:
1124 state->n_wronly++;
1125 break;
1126 case FMODE_READ:
1127 state->n_rdonly++;
1128 break;
1129 case FMODE_READ|FMODE_WRITE:
1130 state->n_rdwr++;
1131 }
1132 nfs4_state_set_mode_locked(state, state->state | fmode);
1133}
1134
1135static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1136{
1137 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1138 nfs4_stateid_copy(&state->stateid, stateid);
1139 nfs4_stateid_copy(&state->open_stateid, stateid);
1140 set_bit(NFS_OPEN_STATE, &state->flags);
1141 switch (fmode) {
1142 case FMODE_READ:
1143 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1144 break;
1145 case FMODE_WRITE:
1146 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1147 break;
1148 case FMODE_READ|FMODE_WRITE:
1149 set_bit(NFS_O_RDWR_STATE, &state->flags);
1150 }
1151}
1152
1153static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1154{
1155 write_seqlock(&state->seqlock);
1156 nfs_set_open_stateid_locked(state, stateid, fmode);
1157 write_sequnlock(&state->seqlock);
1158}
1159
1160static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1161{
1162 /*
1163 * Protect the call to nfs4_state_set_mode_locked and
1164 * serialise the stateid update
1165 */
1166 write_seqlock(&state->seqlock);
1167 if (deleg_stateid != NULL) {
1168 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1169 set_bit(NFS_DELEGATED_STATE, &state->flags);
1170 }
1171 if (open_stateid != NULL)
1172 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1173 write_sequnlock(&state->seqlock);
1174 spin_lock(&state->owner->so_lock);
1175 update_open_stateflags(state, fmode);
1176 spin_unlock(&state->owner->so_lock);
1177}
1178
1179static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1180{
1181 struct nfs_inode *nfsi = NFS_I(state->inode);
1182 struct nfs_delegation *deleg_cur;
1183 int ret = 0;
1184
1185 fmode &= (FMODE_READ|FMODE_WRITE);
1186
1187 rcu_read_lock();
1188 deleg_cur = rcu_dereference(nfsi->delegation);
1189 if (deleg_cur == NULL)
1190 goto no_delegation;
1191
1192 spin_lock(&deleg_cur->lock);
1193 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1194 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1195 (deleg_cur->type & fmode) != fmode)
1196 goto no_delegation_unlock;
1197
1198 if (delegation == NULL)
1199 delegation = &deleg_cur->stateid;
1200 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1201 goto no_delegation_unlock;
1202
1203 nfs_mark_delegation_referenced(deleg_cur);
1204 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1205 ret = 1;
1206no_delegation_unlock:
1207 spin_unlock(&deleg_cur->lock);
1208no_delegation:
1209 rcu_read_unlock();
1210
1211 if (!ret && open_stateid != NULL) {
1212 __update_open_stateid(state, open_stateid, NULL, fmode);
1213 ret = 1;
1214 }
1215
1216 return ret;
1217}
1218
1219
1220static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1221{
1222 struct nfs_delegation *delegation;
1223
1224 rcu_read_lock();
1225 delegation = rcu_dereference(NFS_I(inode)->delegation);
1226 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1227 rcu_read_unlock();
1228 return;
1229 }
1230 rcu_read_unlock();
1231 nfs4_inode_return_delegation(inode);
1232}
1233
1234static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1235{
1236 struct nfs4_state *state = opendata->state;
1237 struct nfs_inode *nfsi = NFS_I(state->inode);
1238 struct nfs_delegation *delegation;
1239 int open_mode = opendata->o_arg.open_flags;
1240 fmode_t fmode = opendata->o_arg.fmode;
1241 nfs4_stateid stateid;
1242 int ret = -EAGAIN;
1243
1244 for (;;) {
1245 if (can_open_cached(state, fmode, open_mode)) {
1246 spin_lock(&state->owner->so_lock);
1247 if (can_open_cached(state, fmode, open_mode)) {
1248 update_open_stateflags(state, fmode);
1249 spin_unlock(&state->owner->so_lock);
1250 goto out_return_state;
1251 }
1252 spin_unlock(&state->owner->so_lock);
1253 }
1254 rcu_read_lock();
1255 delegation = rcu_dereference(nfsi->delegation);
1256 if (!can_open_delegated(delegation, fmode)) {
1257 rcu_read_unlock();
1258 break;
1259 }
1260 /* Save the delegation */
1261 nfs4_stateid_copy(&stateid, &delegation->stateid);
1262 rcu_read_unlock();
1263 nfs_release_seqid(opendata->o_arg.seqid);
1264 if (!opendata->is_recover) {
1265 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1266 if (ret != 0)
1267 goto out;
1268 }
1269 ret = -EAGAIN;
1270
1271 /* Try to update the stateid using the delegation */
1272 if (update_open_stateid(state, NULL, &stateid, fmode))
1273 goto out_return_state;
1274 }
1275out:
1276 return ERR_PTR(ret);
1277out_return_state:
1278 atomic_inc(&state->count);
1279 return state;
1280}
1281
1282static void
1283nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1284{
1285 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1286 struct nfs_delegation *delegation;
1287 int delegation_flags = 0;
1288
1289 rcu_read_lock();
1290 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1291 if (delegation)
1292 delegation_flags = delegation->flags;
1293 rcu_read_unlock();
1294 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1295 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1296 "returning a delegation for "
1297 "OPEN(CLAIM_DELEGATE_CUR)\n",
1298 clp->cl_hostname);
1299 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1300 nfs_inode_set_delegation(state->inode,
1301 data->owner->so_cred,
1302 &data->o_res);
1303 else
1304 nfs_inode_reclaim_delegation(state->inode,
1305 data->owner->so_cred,
1306 &data->o_res);
1307}
1308
1309/*
1310 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1311 * and update the nfs4_state.
1312 */
1313static struct nfs4_state *
1314_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1315{
1316 struct inode *inode = data->state->inode;
1317 struct nfs4_state *state = data->state;
1318 int ret;
1319
1320 if (!data->rpc_done) {
1321 ret = data->rpc_status;
1322 goto err;
1323 }
1324
1325 ret = -ESTALE;
1326 if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1327 !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1328 !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1329 goto err;
1330
1331 ret = -ENOMEM;
1332 state = nfs4_get_open_state(inode, data->owner);
1333 if (state == NULL)
1334 goto err;
1335
1336 ret = nfs_refresh_inode(inode, &data->f_attr);
1337 if (ret)
1338 goto err;
1339
1340 nfs_setsecurity(inode, &data->f_attr, data->f_label);
1341
1342 if (data->o_res.delegation_type != 0)
1343 nfs4_opendata_check_deleg(data, state);
1344 update_open_stateid(state, &data->o_res.stateid, NULL,
1345 data->o_arg.fmode);
1346
1347 return state;
1348err:
1349 return ERR_PTR(ret);
1350
1351}
1352
1353static struct nfs4_state *
1354_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1355{
1356 struct inode *inode;
1357 struct nfs4_state *state = NULL;
1358 int ret;
1359
1360 if (!data->rpc_done) {
1361 state = nfs4_try_open_cached(data);
1362 goto out;
1363 }
1364
1365 ret = -EAGAIN;
1366 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1367 goto err;
1368 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1369 ret = PTR_ERR(inode);
1370 if (IS_ERR(inode))
1371 goto err;
1372 ret = -ENOMEM;
1373 state = nfs4_get_open_state(inode, data->owner);
1374 if (state == NULL)
1375 goto err_put_inode;
1376 if (data->o_res.delegation_type != 0)
1377 nfs4_opendata_check_deleg(data, state);
1378 update_open_stateid(state, &data->o_res.stateid, NULL,
1379 data->o_arg.fmode);
1380 iput(inode);
1381out:
1382 nfs_release_seqid(data->o_arg.seqid);
1383 return state;
1384err_put_inode:
1385 iput(inode);
1386err:
1387 return ERR_PTR(ret);
1388}
1389
1390static struct nfs4_state *
1391nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1392{
1393 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1394 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1395 return _nfs4_opendata_to_nfs4_state(data);
1396}
1397
1398static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1399{
1400 struct nfs_inode *nfsi = NFS_I(state->inode);
1401 struct nfs_open_context *ctx;
1402
1403 spin_lock(&state->inode->i_lock);
1404 list_for_each_entry(ctx, &nfsi->open_files, list) {
1405 if (ctx->state != state)
1406 continue;
1407 get_nfs_open_context(ctx);
1408 spin_unlock(&state->inode->i_lock);
1409 return ctx;
1410 }
1411 spin_unlock(&state->inode->i_lock);
1412 return ERR_PTR(-ENOENT);
1413}
1414
1415static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1416 struct nfs4_state *state, enum open_claim_type4 claim)
1417{
1418 struct nfs4_opendata *opendata;
1419
1420 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1421 NULL, NULL, claim, GFP_NOFS);
1422 if (opendata == NULL)
1423 return ERR_PTR(-ENOMEM);
1424 opendata->state = state;
1425 atomic_inc(&state->count);
1426 return opendata;
1427}
1428
1429static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1430{
1431 struct nfs4_state *newstate;
1432 int ret;
1433
1434 opendata->o_arg.open_flags = 0;
1435 opendata->o_arg.fmode = fmode;
1436 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1437 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1438 nfs4_init_opendata_res(opendata);
1439 ret = _nfs4_recover_proc_open(opendata);
1440 if (ret != 0)
1441 return ret;
1442 newstate = nfs4_opendata_to_nfs4_state(opendata);
1443 if (IS_ERR(newstate))
1444 return PTR_ERR(newstate);
1445 nfs4_close_state(newstate, fmode);
1446 *res = newstate;
1447 return 0;
1448}
1449
1450static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1451{
1452 struct nfs4_state *newstate;
1453 int ret;
1454
1455 /* memory barrier prior to reading state->n_* */
1456 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1457 clear_bit(NFS_OPEN_STATE, &state->flags);
1458 smp_rmb();
1459 if (state->n_rdwr != 0) {
1460 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1461 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1462 if (ret != 0)
1463 return ret;
1464 if (newstate != state)
1465 return -ESTALE;
1466 }
1467 if (state->n_wronly != 0) {
1468 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1469 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1470 if (ret != 0)
1471 return ret;
1472 if (newstate != state)
1473 return -ESTALE;
1474 }
1475 if (state->n_rdonly != 0) {
1476 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1477 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1478 if (ret != 0)
1479 return ret;
1480 if (newstate != state)
1481 return -ESTALE;
1482 }
1483 /*
1484 * We may have performed cached opens for all three recoveries.
1485 * Check if we need to update the current stateid.
1486 */
1487 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1488 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1489 write_seqlock(&state->seqlock);
1490 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1491 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1492 write_sequnlock(&state->seqlock);
1493 }
1494 return 0;
1495}
1496
1497/*
1498 * OPEN_RECLAIM:
1499 * reclaim state on the server after a reboot.
1500 */
1501static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1502{
1503 struct nfs_delegation *delegation;
1504 struct nfs4_opendata *opendata;
1505 fmode_t delegation_type = 0;
1506 int status;
1507
1508 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1509 NFS4_OPEN_CLAIM_PREVIOUS);
1510 if (IS_ERR(opendata))
1511 return PTR_ERR(opendata);
1512 rcu_read_lock();
1513 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1514 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1515 delegation_type = delegation->type;
1516 rcu_read_unlock();
1517 opendata->o_arg.u.delegation_type = delegation_type;
1518 status = nfs4_open_recover(opendata, state);
1519 nfs4_opendata_put(opendata);
1520 return status;
1521}
1522
1523static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1524{
1525 struct nfs_server *server = NFS_SERVER(state->inode);
1526 struct nfs4_exception exception = { };
1527 int err;
1528 do {
1529 err = _nfs4_do_open_reclaim(ctx, state);
1530 trace_nfs4_open_reclaim(ctx, 0, err);
1531 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1532 continue;
1533 if (err != -NFS4ERR_DELAY)
1534 break;
1535 nfs4_handle_exception(server, err, &exception);
1536 } while (exception.retry);
1537 return err;
1538}
1539
1540static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1541{
1542 struct nfs_open_context *ctx;
1543 int ret;
1544
1545 ctx = nfs4_state_find_open_context(state);
1546 if (IS_ERR(ctx))
1547 return -EAGAIN;
1548 ret = nfs4_do_open_reclaim(ctx, state);
1549 put_nfs_open_context(ctx);
1550 return ret;
1551}
1552
1553static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1554{
1555 switch (err) {
1556 default:
1557 printk(KERN_ERR "NFS: %s: unhandled error "
1558 "%d.\n", __func__, err);
1559 case 0:
1560 case -ENOENT:
1561 case -ESTALE:
1562 break;
1563 case -NFS4ERR_BADSESSION:
1564 case -NFS4ERR_BADSLOT:
1565 case -NFS4ERR_BAD_HIGH_SLOT:
1566 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1567 case -NFS4ERR_DEADSESSION:
1568 set_bit(NFS_DELEGATED_STATE, &state->flags);
1569 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1570 return -EAGAIN;
1571 case -NFS4ERR_STALE_CLIENTID:
1572 case -NFS4ERR_STALE_STATEID:
1573 set_bit(NFS_DELEGATED_STATE, &state->flags);
1574 case -NFS4ERR_EXPIRED:
1575 /* Don't recall a delegation if it was lost */
1576 nfs4_schedule_lease_recovery(server->nfs_client);
1577 return -EAGAIN;
1578 case -NFS4ERR_DELEG_REVOKED:
1579 case -NFS4ERR_ADMIN_REVOKED:
1580 case -NFS4ERR_BAD_STATEID:
1581 case -NFS4ERR_OPENMODE:
1582 nfs_inode_find_state_and_recover(state->inode,
1583 stateid);
1584 nfs4_schedule_stateid_recovery(server, state);
1585 return 0;
1586 case -NFS4ERR_DELAY:
1587 case -NFS4ERR_GRACE:
1588 set_bit(NFS_DELEGATED_STATE, &state->flags);
1589 ssleep(1);
1590 return -EAGAIN;
1591 case -ENOMEM:
1592 case -NFS4ERR_DENIED:
1593 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1594 return 0;
1595 }
1596 return err;
1597}
1598
1599int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1600{
1601 struct nfs_server *server = NFS_SERVER(state->inode);
1602 struct nfs4_opendata *opendata;
1603 int err;
1604
1605 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1606 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1607 if (IS_ERR(opendata))
1608 return PTR_ERR(opendata);
1609 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1610 err = nfs4_open_recover(opendata, state);
1611 nfs4_opendata_put(opendata);
1612 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1613}
1614
1615static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1616{
1617 struct nfs4_opendata *data = calldata;
1618
1619 nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1620 &data->o_res.seq_res, task);
1621}
1622
1623static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1624{
1625 struct nfs4_opendata *data = calldata;
1626
1627 nfs40_sequence_done(task, &data->o_res.seq_res);
1628
1629 data->rpc_status = task->tk_status;
1630 if (data->rpc_status == 0) {
1631 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1632 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1633 renew_lease(data->o_res.server, data->timestamp);
1634 data->rpc_done = 1;
1635 }
1636}
1637
1638static void nfs4_open_confirm_release(void *calldata)
1639{
1640 struct nfs4_opendata *data = calldata;
1641 struct nfs4_state *state = NULL;
1642
1643 /* If this request hasn't been cancelled, do nothing */
1644 if (data->cancelled == 0)
1645 goto out_free;
1646 /* In case of error, no cleanup! */
1647 if (!data->rpc_done)
1648 goto out_free;
1649 state = nfs4_opendata_to_nfs4_state(data);
1650 if (!IS_ERR(state))
1651 nfs4_close_state(state, data->o_arg.fmode);
1652out_free:
1653 nfs4_opendata_put(data);
1654}
1655
1656static const struct rpc_call_ops nfs4_open_confirm_ops = {
1657 .rpc_call_prepare = nfs4_open_confirm_prepare,
1658 .rpc_call_done = nfs4_open_confirm_done,
1659 .rpc_release = nfs4_open_confirm_release,
1660};
1661
1662/*
1663 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1664 */
1665static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1666{
1667 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1668 struct rpc_task *task;
1669 struct rpc_message msg = {
1670 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1671 .rpc_argp = &data->c_arg,
1672 .rpc_resp = &data->c_res,
1673 .rpc_cred = data->owner->so_cred,
1674 };
1675 struct rpc_task_setup task_setup_data = {
1676 .rpc_client = server->client,
1677 .rpc_message = &msg,
1678 .callback_ops = &nfs4_open_confirm_ops,
1679 .callback_data = data,
1680 .workqueue = nfsiod_workqueue,
1681 .flags = RPC_TASK_ASYNC,
1682 };
1683 int status;
1684
1685 nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1686 kref_get(&data->kref);
1687 data->rpc_done = 0;
1688 data->rpc_status = 0;
1689 data->timestamp = jiffies;
1690 task = rpc_run_task(&task_setup_data);
1691 if (IS_ERR(task))
1692 return PTR_ERR(task);
1693 status = nfs4_wait_for_completion_rpc_task(task);
1694 if (status != 0) {
1695 data->cancelled = 1;
1696 smp_wmb();
1697 } else
1698 status = data->rpc_status;
1699 rpc_put_task(task);
1700 return status;
1701}
1702
1703static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1704{
1705 struct nfs4_opendata *data = calldata;
1706 struct nfs4_state_owner *sp = data->owner;
1707 struct nfs_client *clp = sp->so_server->nfs_client;
1708
1709 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1710 goto out_wait;
1711 /*
1712 * Check if we still need to send an OPEN call, or if we can use
1713 * a delegation instead.
1714 */
1715 if (data->state != NULL) {
1716 struct nfs_delegation *delegation;
1717
1718 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1719 goto out_no_action;
1720 rcu_read_lock();
1721 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1722 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1723 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1724 can_open_delegated(delegation, data->o_arg.fmode))
1725 goto unlock_no_action;
1726 rcu_read_unlock();
1727 }
1728 /* Update client id. */
1729 data->o_arg.clientid = clp->cl_clientid;
1730 switch (data->o_arg.claim) {
1731 case NFS4_OPEN_CLAIM_PREVIOUS:
1732 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1733 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1734 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1735 case NFS4_OPEN_CLAIM_FH:
1736 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1737 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1738 }
1739 data->timestamp = jiffies;
1740 if (nfs4_setup_sequence(data->o_arg.server,
1741 &data->o_arg.seq_args,
1742 &data->o_res.seq_res,
1743 task) != 0)
1744 nfs_release_seqid(data->o_arg.seqid);
1745
1746 /* Set the create mode (note dependency on the session type) */
1747 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1748 if (data->o_arg.open_flags & O_EXCL) {
1749 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1750 if (nfs4_has_persistent_session(clp))
1751 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1752 else if (clp->cl_mvops->minor_version > 0)
1753 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1754 }
1755 return;
1756unlock_no_action:
1757 rcu_read_unlock();
1758out_no_action:
1759 task->tk_action = NULL;
1760out_wait:
1761 nfs4_sequence_done(task, &data->o_res.seq_res);
1762}
1763
1764static void nfs4_open_done(struct rpc_task *task, void *calldata)
1765{
1766 struct nfs4_opendata *data = calldata;
1767
1768 data->rpc_status = task->tk_status;
1769
1770 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1771 return;
1772
1773 if (task->tk_status == 0) {
1774 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1775 switch (data->o_res.f_attr->mode & S_IFMT) {
1776 case S_IFREG:
1777 break;
1778 case S_IFLNK:
1779 data->rpc_status = -ELOOP;
1780 break;
1781 case S_IFDIR:
1782 data->rpc_status = -EISDIR;
1783 break;
1784 default:
1785 data->rpc_status = -ENOTDIR;
1786 }
1787 }
1788 renew_lease(data->o_res.server, data->timestamp);
1789 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1790 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1791 }
1792 data->rpc_done = 1;
1793}
1794
1795static void nfs4_open_release(void *calldata)
1796{
1797 struct nfs4_opendata *data = calldata;
1798 struct nfs4_state *state = NULL;
1799
1800 /* If this request hasn't been cancelled, do nothing */
1801 if (data->cancelled == 0)
1802 goto out_free;
1803 /* In case of error, no cleanup! */
1804 if (data->rpc_status != 0 || !data->rpc_done)
1805 goto out_free;
1806 /* In case we need an open_confirm, no cleanup! */
1807 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1808 goto out_free;
1809 state = nfs4_opendata_to_nfs4_state(data);
1810 if (!IS_ERR(state))
1811 nfs4_close_state(state, data->o_arg.fmode);
1812out_free:
1813 nfs4_opendata_put(data);
1814}
1815
1816static const struct rpc_call_ops nfs4_open_ops = {
1817 .rpc_call_prepare = nfs4_open_prepare,
1818 .rpc_call_done = nfs4_open_done,
1819 .rpc_release = nfs4_open_release,
1820};
1821
1822static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1823{
1824 struct inode *dir = data->dir->d_inode;
1825 struct nfs_server *server = NFS_SERVER(dir);
1826 struct nfs_openargs *o_arg = &data->o_arg;
1827 struct nfs_openres *o_res = &data->o_res;
1828 struct rpc_task *task;
1829 struct rpc_message msg = {
1830 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1831 .rpc_argp = o_arg,
1832 .rpc_resp = o_res,
1833 .rpc_cred = data->owner->so_cred,
1834 };
1835 struct rpc_task_setup task_setup_data = {
1836 .rpc_client = server->client,
1837 .rpc_message = &msg,
1838 .callback_ops = &nfs4_open_ops,
1839 .callback_data = data,
1840 .workqueue = nfsiod_workqueue,
1841 .flags = RPC_TASK_ASYNC,
1842 };
1843 int status;
1844
1845 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1846 kref_get(&data->kref);
1847 data->rpc_done = 0;
1848 data->rpc_status = 0;
1849 data->cancelled = 0;
1850 data->is_recover = 0;
1851 if (isrecover) {
1852 nfs4_set_sequence_privileged(&o_arg->seq_args);
1853 data->is_recover = 1;
1854 }
1855 task = rpc_run_task(&task_setup_data);
1856 if (IS_ERR(task))
1857 return PTR_ERR(task);
1858 status = nfs4_wait_for_completion_rpc_task(task);
1859 if (status != 0) {
1860 data->cancelled = 1;
1861 smp_wmb();
1862 } else
1863 status = data->rpc_status;
1864 rpc_put_task(task);
1865
1866 return status;
1867}
1868
1869static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1870{
1871 struct inode *dir = data->dir->d_inode;
1872 struct nfs_openres *o_res = &data->o_res;
1873 int status;
1874
1875 status = nfs4_run_open_task(data, 1);
1876 if (status != 0 || !data->rpc_done)
1877 return status;
1878
1879 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1880
1881 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1882 status = _nfs4_proc_open_confirm(data);
1883 if (status != 0)
1884 return status;
1885 }
1886
1887 return status;
1888}
1889
1890static int nfs4_opendata_access(struct rpc_cred *cred,
1891 struct nfs4_opendata *opendata,
1892 struct nfs4_state *state, fmode_t fmode,
1893 int openflags)
1894{
1895 struct nfs_access_entry cache;
1896 u32 mask;
1897
1898 /* access call failed or for some reason the server doesn't
1899 * support any access modes -- defer access call until later */
1900 if (opendata->o_res.access_supported == 0)
1901 return 0;
1902
1903 mask = 0;
1904 /* don't check MAY_WRITE - a newly created file may not have
1905 * write mode bits, but POSIX allows the creating process to write.
1906 * use openflags to check for exec, because fmode won't
1907 * always have FMODE_EXEC set when file open for exec. */
1908 if (openflags & __FMODE_EXEC) {
1909 /* ONLY check for exec rights */
1910 mask = MAY_EXEC;
1911 } else if (fmode & FMODE_READ)
1912 mask = MAY_READ;
1913
1914 cache.cred = cred;
1915 cache.jiffies = jiffies;
1916 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1917 nfs_access_add_cache(state->inode, &cache);
1918
1919 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1920 return 0;
1921
1922 /* even though OPEN succeeded, access is denied. Close the file */
1923 nfs4_close_state(state, fmode);
1924 return -EACCES;
1925}
1926
1927/*
1928 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1929 */
1930static int _nfs4_proc_open(struct nfs4_opendata *data)
1931{
1932 struct inode *dir = data->dir->d_inode;
1933 struct nfs_server *server = NFS_SERVER(dir);
1934 struct nfs_openargs *o_arg = &data->o_arg;
1935 struct nfs_openres *o_res = &data->o_res;
1936 int status;
1937
1938 status = nfs4_run_open_task(data, 0);
1939 if (!data->rpc_done)
1940 return status;
1941 if (status != 0) {
1942 if (status == -NFS4ERR_BADNAME &&
1943 !(o_arg->open_flags & O_CREAT))
1944 return -ENOENT;
1945 return status;
1946 }
1947
1948 nfs_fattr_map_and_free_names(server, &data->f_attr);
1949
1950 if (o_arg->open_flags & O_CREAT) {
1951 update_changeattr(dir, &o_res->cinfo);
1952 if (o_arg->open_flags & O_EXCL)
1953 data->file_created = 1;
1954 else if (o_res->cinfo.before != o_res->cinfo.after)
1955 data->file_created = 1;
1956 }
1957 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1958 server->caps &= ~NFS_CAP_POSIX_LOCK;
1959 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1960 status = _nfs4_proc_open_confirm(data);
1961 if (status != 0)
1962 return status;
1963 }
1964 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1965 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1966 return 0;
1967}
1968
1969static int nfs4_recover_expired_lease(struct nfs_server *server)
1970{
1971 return nfs4_client_recover_expired_lease(server->nfs_client);
1972}
1973
1974/*
1975 * OPEN_EXPIRED:
1976 * reclaim state on the server after a network partition.
1977 * Assumes caller holds the appropriate lock
1978 */
1979static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1980{
1981 struct nfs4_opendata *opendata;
1982 int ret;
1983
1984 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1985 NFS4_OPEN_CLAIM_FH);
1986 if (IS_ERR(opendata))
1987 return PTR_ERR(opendata);
1988 ret = nfs4_open_recover(opendata, state);
1989 if (ret == -ESTALE)
1990 d_drop(ctx->dentry);
1991 nfs4_opendata_put(opendata);
1992 return ret;
1993}
1994
1995static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1996{
1997 struct nfs_server *server = NFS_SERVER(state->inode);
1998 struct nfs4_exception exception = { };
1999 int err;
2000
2001 do {
2002 err = _nfs4_open_expired(ctx, state);
2003 trace_nfs4_open_expired(ctx, 0, err);
2004 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2005 continue;
2006 switch (err) {
2007 default:
2008 goto out;
2009 case -NFS4ERR_GRACE:
2010 case -NFS4ERR_DELAY:
2011 nfs4_handle_exception(server, err, &exception);
2012 err = 0;
2013 }
2014 } while (exception.retry);
2015out:
2016 return err;
2017}
2018
2019static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2020{
2021 struct nfs_open_context *ctx;
2022 int ret;
2023
2024 ctx = nfs4_state_find_open_context(state);
2025 if (IS_ERR(ctx))
2026 return -EAGAIN;
2027 ret = nfs4_do_open_expired(ctx, state);
2028 put_nfs_open_context(ctx);
2029 return ret;
2030}
2031
2032#if defined(CONFIG_NFS_V4_1)
2033static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2034{
2035 struct nfs_server *server = NFS_SERVER(state->inode);
2036 nfs4_stateid *stateid = &state->stateid;
2037 struct nfs_delegation *delegation;
2038 struct rpc_cred *cred = NULL;
2039 int status = -NFS4ERR_BAD_STATEID;
2040
2041 /* If a state reset has been done, test_stateid is unneeded */
2042 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2043 return;
2044
2045 /* Get the delegation credential for use by test/free_stateid */
2046 rcu_read_lock();
2047 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2048 if (delegation != NULL &&
2049 nfs4_stateid_match(&delegation->stateid, stateid)) {
2050 cred = get_rpccred(delegation->cred);
2051 rcu_read_unlock();
2052 status = nfs41_test_stateid(server, stateid, cred);
2053 trace_nfs4_test_delegation_stateid(state, NULL, status);
2054 } else
2055 rcu_read_unlock();
2056
2057 if (status != NFS_OK) {
2058 /* Free the stateid unless the server explicitly
2059 * informs us the stateid is unrecognized. */
2060 if (status != -NFS4ERR_BAD_STATEID)
2061 nfs41_free_stateid(server, stateid, cred);
2062 nfs_remove_bad_delegation(state->inode);
2063
2064 write_seqlock(&state->seqlock);
2065 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2066 write_sequnlock(&state->seqlock);
2067 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2068 }
2069
2070 if (cred != NULL)
2071 put_rpccred(cred);
2072}
2073
2074/**
2075 * nfs41_check_open_stateid - possibly free an open stateid
2076 *
2077 * @state: NFSv4 state for an inode
2078 *
2079 * Returns NFS_OK if recovery for this stateid is now finished.
2080 * Otherwise a negative NFS4ERR value is returned.
2081 */
2082static int nfs41_check_open_stateid(struct nfs4_state *state)
2083{
2084 struct nfs_server *server = NFS_SERVER(state->inode);
2085 nfs4_stateid *stateid = &state->open_stateid;
2086 struct rpc_cred *cred = state->owner->so_cred;
2087 int status;
2088
2089 /* If a state reset has been done, test_stateid is unneeded */
2090 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2091 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2092 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2093 return -NFS4ERR_BAD_STATEID;
2094
2095 status = nfs41_test_stateid(server, stateid, cred);
2096 trace_nfs4_test_open_stateid(state, NULL, status);
2097 if (status != NFS_OK) {
2098 /* Free the stateid unless the server explicitly
2099 * informs us the stateid is unrecognized. */
2100 if (status != -NFS4ERR_BAD_STATEID)
2101 nfs41_free_stateid(server, stateid, cred);
2102
2103 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2104 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2105 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2106 clear_bit(NFS_OPEN_STATE, &state->flags);
2107 }
2108 return status;
2109}
2110
2111static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2112{
2113 int status;
2114
2115 nfs41_clear_delegation_stateid(state);
2116 status = nfs41_check_open_stateid(state);
2117 if (status != NFS_OK)
2118 status = nfs4_open_expired(sp, state);
2119 return status;
2120}
2121#endif
2122
2123/*
2124 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2125 * fields corresponding to attributes that were used to store the verifier.
2126 * Make sure we clobber those fields in the later setattr call
2127 */
2128static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2129{
2130 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2131 !(sattr->ia_valid & ATTR_ATIME_SET))
2132 sattr->ia_valid |= ATTR_ATIME;
2133
2134 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2135 !(sattr->ia_valid & ATTR_MTIME_SET))
2136 sattr->ia_valid |= ATTR_MTIME;
2137}
2138
2139static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2140 fmode_t fmode,
2141 int flags,
2142 struct nfs_open_context *ctx)
2143{
2144 struct nfs4_state_owner *sp = opendata->owner;
2145 struct nfs_server *server = sp->so_server;
2146 struct dentry *dentry;
2147 struct nfs4_state *state;
2148 unsigned int seq;
2149 int ret;
2150
2151 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2152
2153 ret = _nfs4_proc_open(opendata);
2154 if (ret != 0)
2155 goto out;
2156
2157 state = nfs4_opendata_to_nfs4_state(opendata);
2158 ret = PTR_ERR(state);
2159 if (IS_ERR(state))
2160 goto out;
2161 if (server->caps & NFS_CAP_POSIX_LOCK)
2162 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2163
2164 dentry = opendata->dentry;
2165 if (dentry->d_inode == NULL) {
2166 /* FIXME: Is this d_drop() ever needed? */
2167 d_drop(dentry);
2168 dentry = d_add_unique(dentry, igrab(state->inode));
2169 if (dentry == NULL) {
2170 dentry = opendata->dentry;
2171 } else if (dentry != ctx->dentry) {
2172 dput(ctx->dentry);
2173 ctx->dentry = dget(dentry);
2174 }
2175 nfs_set_verifier(dentry,
2176 nfs_save_change_attribute(opendata->dir->d_inode));
2177 }
2178
2179 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2180 if (ret != 0)
2181 goto out;
2182
2183 ctx->state = state;
2184 if (dentry->d_inode == state->inode) {
2185 nfs_inode_attach_open_context(ctx);
2186 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2187 nfs4_schedule_stateid_recovery(server, state);
2188 }
2189out:
2190 return ret;
2191}
2192
2193/*
2194 * Returns a referenced nfs4_state
2195 */
2196static int _nfs4_do_open(struct inode *dir,
2197 struct nfs_open_context *ctx,
2198 int flags,
2199 struct iattr *sattr,
2200 struct nfs4_label *label,
2201 int *opened)
2202{
2203 struct nfs4_state_owner *sp;
2204 struct nfs4_state *state = NULL;
2205 struct nfs_server *server = NFS_SERVER(dir);
2206 struct nfs4_opendata *opendata;
2207 struct dentry *dentry = ctx->dentry;
2208 struct rpc_cred *cred = ctx->cred;
2209 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2210 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2211 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2212 struct nfs4_label *olabel = NULL;
2213 int status;
2214
2215 /* Protect against reboot recovery conflicts */
2216 status = -ENOMEM;
2217 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2218 if (sp == NULL) {
2219 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2220 goto out_err;
2221 }
2222 status = nfs4_recover_expired_lease(server);
2223 if (status != 0)
2224 goto err_put_state_owner;
2225 if (dentry->d_inode != NULL)
2226 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2227 status = -ENOMEM;
2228 if (dentry->d_inode)
2229 claim = NFS4_OPEN_CLAIM_FH;
2230 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2231 label, claim, GFP_KERNEL);
2232 if (opendata == NULL)
2233 goto err_put_state_owner;
2234
2235 if (label) {
2236 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2237 if (IS_ERR(olabel)) {
2238 status = PTR_ERR(olabel);
2239 goto err_opendata_put;
2240 }
2241 }
2242
2243 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2244 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2245 if (!opendata->f_attr.mdsthreshold)
2246 goto err_free_label;
2247 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2248 }
2249 if (dentry->d_inode != NULL)
2250 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2251
2252 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2253 if (status != 0)
2254 goto err_free_label;
2255 state = ctx->state;
2256
2257 if ((opendata->o_arg.open_flags & O_EXCL) &&
2258 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2259 nfs4_exclusive_attrset(opendata, sattr);
2260
2261 nfs_fattr_init(opendata->o_res.f_attr);
2262 status = nfs4_do_setattr(state->inode, cred,
2263 opendata->o_res.f_attr, sattr,
2264 state, label, olabel);
2265 if (status == 0) {
2266 nfs_setattr_update_inode(state->inode, sattr);
2267 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2268 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2269 }
2270 }
2271 if (opendata->file_created)
2272 *opened |= FILE_CREATED;
2273
2274 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2275 *ctx_th = opendata->f_attr.mdsthreshold;
2276 else
2277 kfree(opendata->f_attr.mdsthreshold);
2278 opendata->f_attr.mdsthreshold = NULL;
2279
2280 nfs4_label_free(olabel);
2281
2282 nfs4_opendata_put(opendata);
2283 nfs4_put_state_owner(sp);
2284 return 0;
2285err_free_label:
2286 nfs4_label_free(olabel);
2287err_opendata_put:
2288 kfree(opendata->f_attr.mdsthreshold);
2289 nfs4_opendata_put(opendata);
2290err_put_state_owner:
2291 nfs4_put_state_owner(sp);
2292out_err:
2293 return status;
2294}
2295
2296
2297static struct nfs4_state *nfs4_do_open(struct inode *dir,
2298 struct nfs_open_context *ctx,
2299 int flags,
2300 struct iattr *sattr,
2301 struct nfs4_label *label,
2302 int *opened)
2303{
2304 struct nfs_server *server = NFS_SERVER(dir);
2305 struct nfs4_exception exception = { };
2306 struct nfs4_state *res;
2307 int status;
2308
2309 do {
2310 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2311 res = ctx->state;
2312 trace_nfs4_open_file(ctx, flags, status);
2313 if (status == 0)
2314 break;
2315 /* NOTE: BAD_SEQID means the server and client disagree about the
2316 * book-keeping w.r.t. state-changing operations
2317 * (OPEN/CLOSE/LOCK/LOCKU...)
2318 * It is actually a sign of a bug on the client or on the server.
2319 *
2320 * If we receive a BAD_SEQID error in the particular case of
2321 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2322 * have unhashed the old state_owner for us, and that we can
2323 * therefore safely retry using a new one. We should still warn
2324 * the user though...
2325 */
2326 if (status == -NFS4ERR_BAD_SEQID) {
2327 pr_warn_ratelimited("NFS: v4 server %s "
2328 " returned a bad sequence-id error!\n",
2329 NFS_SERVER(dir)->nfs_client->cl_hostname);
2330 exception.retry = 1;
2331 continue;
2332 }
2333 /*
2334 * BAD_STATEID on OPEN means that the server cancelled our
2335 * state before it received the OPEN_CONFIRM.
2336 * Recover by retrying the request as per the discussion
2337 * on Page 181 of RFC3530.
2338 */
2339 if (status == -NFS4ERR_BAD_STATEID) {
2340 exception.retry = 1;
2341 continue;
2342 }
2343 if (status == -EAGAIN) {
2344 /* We must have found a delegation */
2345 exception.retry = 1;
2346 continue;
2347 }
2348 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2349 continue;
2350 res = ERR_PTR(nfs4_handle_exception(server,
2351 status, &exception));
2352 } while (exception.retry);
2353 return res;
2354}
2355
2356static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2357 struct nfs_fattr *fattr, struct iattr *sattr,
2358 struct nfs4_state *state, struct nfs4_label *ilabel,
2359 struct nfs4_label *olabel)
2360{
2361 struct nfs_server *server = NFS_SERVER(inode);
2362 struct nfs_setattrargs arg = {
2363 .fh = NFS_FH(inode),
2364 .iap = sattr,
2365 .server = server,
2366 .bitmask = server->attr_bitmask,
2367 .label = ilabel,
2368 };
2369 struct nfs_setattrres res = {
2370 .fattr = fattr,
2371 .label = olabel,
2372 .server = server,
2373 };
2374 struct rpc_message msg = {
2375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2376 .rpc_argp = &arg,
2377 .rpc_resp = &res,
2378 .rpc_cred = cred,
2379 };
2380 unsigned long timestamp = jiffies;
2381 fmode_t fmode;
2382 bool truncate;
2383 int status;
2384
2385 arg.bitmask = nfs4_bitmask(server, ilabel);
2386 if (ilabel)
2387 arg.bitmask = nfs4_bitmask(server, olabel);
2388
2389 nfs_fattr_init(fattr);
2390
2391 /* Servers should only apply open mode checks for file size changes */
2392 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2393 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2394
2395 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2396 /* Use that stateid */
2397 } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2398 struct nfs_lockowner lockowner = {
2399 .l_owner = current->files,
2400 .l_pid = current->tgid,
2401 };
2402 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2403 &lockowner);
2404 } else
2405 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2406
2407 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2408 if (status == 0 && state != NULL)
2409 renew_lease(server, timestamp);
2410 return status;
2411}
2412
2413static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2414 struct nfs_fattr *fattr, struct iattr *sattr,
2415 struct nfs4_state *state, struct nfs4_label *ilabel,
2416 struct nfs4_label *olabel)
2417{
2418 struct nfs_server *server = NFS_SERVER(inode);
2419 struct nfs4_exception exception = {
2420 .state = state,
2421 .inode = inode,
2422 };
2423 int err;
2424 do {
2425 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2426 trace_nfs4_setattr(inode, err);
2427 switch (err) {
2428 case -NFS4ERR_OPENMODE:
2429 if (!(sattr->ia_valid & ATTR_SIZE)) {
2430 pr_warn_once("NFSv4: server %s is incorrectly "
2431 "applying open mode checks to "
2432 "a SETATTR that is not "
2433 "changing file size.\n",
2434 server->nfs_client->cl_hostname);
2435 }
2436 if (state && !(state->state & FMODE_WRITE)) {
2437 err = -EBADF;
2438 if (sattr->ia_valid & ATTR_OPEN)
2439 err = -EACCES;
2440 goto out;
2441 }
2442 }
2443 err = nfs4_handle_exception(server, err, &exception);
2444 } while (exception.retry);
2445out:
2446 return err;
2447}
2448
2449struct nfs4_closedata {
2450 struct inode *inode;
2451 struct nfs4_state *state;
2452 struct nfs_closeargs arg;
2453 struct nfs_closeres res;
2454 struct nfs_fattr fattr;
2455 unsigned long timestamp;
2456 bool roc;
2457 u32 roc_barrier;
2458};
2459
2460static void nfs4_free_closedata(void *data)
2461{
2462 struct nfs4_closedata *calldata = data;
2463 struct nfs4_state_owner *sp = calldata->state->owner;
2464 struct super_block *sb = calldata->state->inode->i_sb;
2465
2466 if (calldata->roc)
2467 pnfs_roc_release(calldata->state->inode);
2468 nfs4_put_open_state(calldata->state);
2469 nfs_free_seqid(calldata->arg.seqid);
2470 nfs4_put_state_owner(sp);
2471 nfs_sb_deactive(sb);
2472 kfree(calldata);
2473}
2474
2475static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2476 fmode_t fmode)
2477{
2478 spin_lock(&state->owner->so_lock);
2479 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2480 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2481 case FMODE_WRITE:
2482 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2483 break;
2484 case FMODE_READ:
2485 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2486 break;
2487 case 0:
2488 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2489 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2490 clear_bit(NFS_OPEN_STATE, &state->flags);
2491 }
2492 spin_unlock(&state->owner->so_lock);
2493}
2494
2495static void nfs4_close_done(struct rpc_task *task, void *data)
2496{
2497 struct nfs4_closedata *calldata = data;
2498 struct nfs4_state *state = calldata->state;
2499 struct nfs_server *server = NFS_SERVER(calldata->inode);
2500
2501 dprintk("%s: begin!\n", __func__);
2502 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2503 return;
2504 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2505 /* hmm. we are done with the inode, and in the process of freeing
2506 * the state_owner. we keep this around to process errors
2507 */
2508 switch (task->tk_status) {
2509 case 0:
2510 if (calldata->roc)
2511 pnfs_roc_set_barrier(state->inode,
2512 calldata->roc_barrier);
2513 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2514 renew_lease(server, calldata->timestamp);
2515 nfs4_close_clear_stateid_flags(state,
2516 calldata->arg.fmode);
2517 break;
2518 case -NFS4ERR_STALE_STATEID:
2519 case -NFS4ERR_OLD_STATEID:
2520 case -NFS4ERR_BAD_STATEID:
2521 case -NFS4ERR_EXPIRED:
2522 if (calldata->arg.fmode == 0)
2523 break;
2524 default:
2525 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2526 rpc_restart_call_prepare(task);
2527 }
2528 nfs_release_seqid(calldata->arg.seqid);
2529 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2530 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2531}
2532
2533static void nfs4_close_prepare(struct rpc_task *task, void *data)
2534{
2535 struct nfs4_closedata *calldata = data;
2536 struct nfs4_state *state = calldata->state;
2537 struct inode *inode = calldata->inode;
2538 int call_close = 0;
2539
2540 dprintk("%s: begin!\n", __func__);
2541 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2542 goto out_wait;
2543
2544 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2545 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2546 spin_lock(&state->owner->so_lock);
2547 /* Calculate the change in open mode */
2548 if (state->n_rdwr == 0) {
2549 if (state->n_rdonly == 0) {
2550 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2551 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2552 calldata->arg.fmode &= ~FMODE_READ;
2553 }
2554 if (state->n_wronly == 0) {
2555 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2556 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2557 calldata->arg.fmode &= ~FMODE_WRITE;
2558 }
2559 }
2560 if (!nfs4_valid_open_stateid(state))
2561 call_close = 0;
2562 spin_unlock(&state->owner->so_lock);
2563
2564 if (!call_close) {
2565 /* Note: exit _without_ calling nfs4_close_done */
2566 goto out_no_action;
2567 }
2568
2569 if (calldata->arg.fmode == 0) {
2570 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2571 if (calldata->roc &&
2572 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2573 nfs_release_seqid(calldata->arg.seqid);
2574 goto out_wait;
2575 }
2576 }
2577
2578 nfs_fattr_init(calldata->res.fattr);
2579 calldata->timestamp = jiffies;
2580 if (nfs4_setup_sequence(NFS_SERVER(inode),
2581 &calldata->arg.seq_args,
2582 &calldata->res.seq_res,
2583 task) != 0)
2584 nfs_release_seqid(calldata->arg.seqid);
2585 dprintk("%s: done!\n", __func__);
2586 return;
2587out_no_action:
2588 task->tk_action = NULL;
2589out_wait:
2590 nfs4_sequence_done(task, &calldata->res.seq_res);
2591}
2592
2593static const struct rpc_call_ops nfs4_close_ops = {
2594 .rpc_call_prepare = nfs4_close_prepare,
2595 .rpc_call_done = nfs4_close_done,
2596 .rpc_release = nfs4_free_closedata,
2597};
2598
2599/*
2600 * It is possible for data to be read/written from a mem-mapped file
2601 * after the sys_close call (which hits the vfs layer as a flush).
2602 * This means that we can't safely call nfsv4 close on a file until
2603 * the inode is cleared. This in turn means that we are not good
2604 * NFSv4 citizens - we do not indicate to the server to update the file's
2605 * share state even when we are done with one of the three share
2606 * stateid's in the inode.
2607 *
2608 * NOTE: Caller must be holding the sp->so_owner semaphore!
2609 */
2610int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2611{
2612 struct nfs_server *server = NFS_SERVER(state->inode);
2613 struct nfs4_closedata *calldata;
2614 struct nfs4_state_owner *sp = state->owner;
2615 struct rpc_task *task;
2616 struct rpc_message msg = {
2617 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2618 .rpc_cred = state->owner->so_cred,
2619 };
2620 struct rpc_task_setup task_setup_data = {
2621 .rpc_client = server->client,
2622 .rpc_message = &msg,
2623 .callback_ops = &nfs4_close_ops,
2624 .workqueue = nfsiod_workqueue,
2625 .flags = RPC_TASK_ASYNC,
2626 };
2627 int status = -ENOMEM;
2628
2629 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2630 &task_setup_data.rpc_client, &msg);
2631
2632 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2633 if (calldata == NULL)
2634 goto out;
2635 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2636 calldata->inode = state->inode;
2637 calldata->state = state;
2638 calldata->arg.fh = NFS_FH(state->inode);
2639 calldata->arg.stateid = &state->open_stateid;
2640 /* Serialization for the sequence id */
2641 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2642 if (calldata->arg.seqid == NULL)
2643 goto out_free_calldata;
2644 calldata->arg.fmode = 0;
2645 calldata->arg.bitmask = server->cache_consistency_bitmask;
2646 calldata->res.fattr = &calldata->fattr;
2647 calldata->res.seqid = calldata->arg.seqid;
2648 calldata->res.server = server;
2649 calldata->roc = pnfs_roc(state->inode);
2650 nfs_sb_active(calldata->inode->i_sb);
2651
2652 msg.rpc_argp = &calldata->arg;
2653 msg.rpc_resp = &calldata->res;
2654 task_setup_data.callback_data = calldata;
2655 task = rpc_run_task(&task_setup_data);
2656 if (IS_ERR(task))
2657 return PTR_ERR(task);
2658 status = 0;
2659 if (wait)
2660 status = rpc_wait_for_completion_task(task);
2661 rpc_put_task(task);
2662 return status;
2663out_free_calldata:
2664 kfree(calldata);
2665out:
2666 nfs4_put_open_state(state);
2667 nfs4_put_state_owner(sp);
2668 return status;
2669}
2670
2671static struct inode *
2672nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2673 int open_flags, struct iattr *attr, int *opened)
2674{
2675 struct nfs4_state *state;
2676 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2677
2678 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2679
2680 /* Protect against concurrent sillydeletes */
2681 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2682
2683 nfs4_label_release_security(label);
2684
2685 if (IS_ERR(state))
2686 return ERR_CAST(state);
2687 return state->inode;
2688}
2689
2690static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2691{
2692 if (ctx->state == NULL)
2693 return;
2694 if (is_sync)
2695 nfs4_close_sync(ctx->state, ctx->mode);
2696 else
2697 nfs4_close_state(ctx->state, ctx->mode);
2698}
2699
2700static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2701{
2702 struct nfs4_server_caps_arg args = {
2703 .fhandle = fhandle,
2704 };
2705 struct nfs4_server_caps_res res = {};
2706 struct rpc_message msg = {
2707 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2708 .rpc_argp = &args,
2709 .rpc_resp = &res,
2710 };
2711 int status;
2712
2713 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2714 if (status == 0) {
2715 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2716 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2717 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2718 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2719 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2720 NFS_CAP_CTIME|NFS_CAP_MTIME);
2721 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2722 server->caps |= NFS_CAP_ACLS;
2723 if (res.has_links != 0)
2724 server->caps |= NFS_CAP_HARDLINKS;
2725 if (res.has_symlinks != 0)
2726 server->caps |= NFS_CAP_SYMLINKS;
2727 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2728 server->caps |= NFS_CAP_FILEID;
2729 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2730 server->caps |= NFS_CAP_MODE;
2731 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2732 server->caps |= NFS_CAP_NLINK;
2733 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2734 server->caps |= NFS_CAP_OWNER;
2735 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2736 server->caps |= NFS_CAP_OWNER_GROUP;
2737 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2738 server->caps |= NFS_CAP_ATIME;
2739 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2740 server->caps |= NFS_CAP_CTIME;
2741 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2742 server->caps |= NFS_CAP_MTIME;
2743#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2744 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2745 server->caps |= NFS_CAP_SECURITY_LABEL;
2746#endif
2747 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2748 sizeof(server->attr_bitmask));
2749
2750 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2751 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2752 res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2753 }
2754 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2755 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2756 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2757 server->acl_bitmask = res.acl_bitmask;
2758 server->fh_expire_type = res.fh_expire_type;
2759 }
2760
2761 return status;
2762}
2763
2764int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2765{
2766 struct nfs4_exception exception = { };
2767 int err;
2768 do {
2769 err = nfs4_handle_exception(server,
2770 _nfs4_server_capabilities(server, fhandle),
2771 &exception);
2772 } while (exception.retry);
2773 return err;
2774}
2775
2776static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2777 struct nfs_fsinfo *info)
2778{
2779 u32 bitmask[3];
2780 struct nfs4_lookup_root_arg args = {
2781 .bitmask = bitmask,
2782 };
2783 struct nfs4_lookup_res res = {
2784 .server = server,
2785 .fattr = info->fattr,
2786 .fh = fhandle,
2787 };
2788 struct rpc_message msg = {
2789 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2790 .rpc_argp = &args,
2791 .rpc_resp = &res,
2792 };
2793
2794 bitmask[0] = nfs4_fattr_bitmap[0];
2795 bitmask[1] = nfs4_fattr_bitmap[1];
2796 /*
2797 * Process the label in the upcoming getfattr
2798 */
2799 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2800
2801 nfs_fattr_init(info->fattr);
2802 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2803}
2804
2805static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2806 struct nfs_fsinfo *info)
2807{
2808 struct nfs4_exception exception = { };
2809 int err;
2810 do {
2811 err = _nfs4_lookup_root(server, fhandle, info);
2812 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2813 switch (err) {
2814 case 0:
2815 case -NFS4ERR_WRONGSEC:
2816 goto out;
2817 default:
2818 err = nfs4_handle_exception(server, err, &exception);
2819 }
2820 } while (exception.retry);
2821out:
2822 return err;
2823}
2824
2825static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2826 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2827{
2828 struct rpc_auth_create_args auth_args = {
2829 .pseudoflavor = flavor,
2830 };
2831 struct rpc_auth *auth;
2832 int ret;
2833
2834 auth = rpcauth_create(&auth_args, server->client);
2835 if (IS_ERR(auth)) {
2836 ret = -EACCES;
2837 goto out;
2838 }
2839 ret = nfs4_lookup_root(server, fhandle, info);
2840out:
2841 return ret;
2842}
2843
2844/*
2845 * Retry pseudoroot lookup with various security flavors. We do this when:
2846 *
2847 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2848 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2849 *
2850 * Returns zero on success, or a negative NFS4ERR value, or a
2851 * negative errno value.
2852 */
2853static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2854 struct nfs_fsinfo *info)
2855{
2856 /* Per 3530bis 15.33.5 */
2857 static const rpc_authflavor_t flav_array[] = {
2858 RPC_AUTH_GSS_KRB5P,
2859 RPC_AUTH_GSS_KRB5I,
2860 RPC_AUTH_GSS_KRB5,
2861 RPC_AUTH_UNIX, /* courtesy */
2862 RPC_AUTH_NULL,
2863 };
2864 int status = -EPERM;
2865 size_t i;
2866
2867 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2868 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2869 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2870 continue;
2871 break;
2872 }
2873
2874 /*
2875 * -EACCESS could mean that the user doesn't have correct permissions
2876 * to access the mount. It could also mean that we tried to mount
2877 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2878 * existing mount programs don't handle -EACCES very well so it should
2879 * be mapped to -EPERM instead.
2880 */
2881 if (status == -EACCES)
2882 status = -EPERM;
2883 return status;
2884}
2885
2886static int nfs4_do_find_root_sec(struct nfs_server *server,
2887 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2888{
2889 int mv = server->nfs_client->cl_minorversion;
2890 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2891}
2892
2893/**
2894 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2895 * @server: initialized nfs_server handle
2896 * @fhandle: we fill in the pseudo-fs root file handle
2897 * @info: we fill in an FSINFO struct
2898 * @auth_probe: probe the auth flavours
2899 *
2900 * Returns zero on success, or a negative errno.
2901 */
2902int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2903 struct nfs_fsinfo *info,
2904 bool auth_probe)
2905{
2906 int status;
2907
2908 switch (auth_probe) {
2909 case false:
2910 status = nfs4_lookup_root(server, fhandle, info);
2911 if (status != -NFS4ERR_WRONGSEC)
2912 break;
2913 /* Did user force a 'sec=' mount option? */
2914 if (server->flags & NFS_MOUNT_SECFLAVOUR)
2915 break;
2916 default:
2917 status = nfs4_do_find_root_sec(server, fhandle, info);
2918 }
2919
2920 if (status == 0)
2921 status = nfs4_server_capabilities(server, fhandle);
2922 if (status == 0)
2923 status = nfs4_do_fsinfo(server, fhandle, info);
2924
2925 return nfs4_map_errors(status);
2926}
2927
2928static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2929 struct nfs_fsinfo *info)
2930{
2931 int error;
2932 struct nfs_fattr *fattr = info->fattr;
2933 struct nfs4_label *label = NULL;
2934
2935 error = nfs4_server_capabilities(server, mntfh);
2936 if (error < 0) {
2937 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2938 return error;
2939 }
2940
2941 label = nfs4_label_alloc(server, GFP_KERNEL);
2942 if (IS_ERR(label))
2943 return PTR_ERR(label);
2944
2945 error = nfs4_proc_getattr(server, mntfh, fattr, label);
2946 if (error < 0) {
2947 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2948 goto err_free_label;
2949 }
2950
2951 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2952 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2953 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2954
2955err_free_label:
2956 nfs4_label_free(label);
2957
2958 return error;
2959}
2960
2961/*
2962 * Get locations and (maybe) other attributes of a referral.
2963 * Note that we'll actually follow the referral later when
2964 * we detect fsid mismatch in inode revalidation
2965 */
2966static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2967 const struct qstr *name, struct nfs_fattr *fattr,
2968 struct nfs_fh *fhandle)
2969{
2970 int status = -ENOMEM;
2971 struct page *page = NULL;
2972 struct nfs4_fs_locations *locations = NULL;
2973
2974 page = alloc_page(GFP_KERNEL);
2975 if (page == NULL)
2976 goto out;
2977 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2978 if (locations == NULL)
2979 goto out;
2980
2981 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2982 if (status != 0)
2983 goto out;
2984 /* Make sure server returned a different fsid for the referral */
2985 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2986 dprintk("%s: server did not return a different fsid for"
2987 " a referral at %s\n", __func__, name->name);
2988 status = -EIO;
2989 goto out;
2990 }
2991 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2992 nfs_fixup_referral_attributes(&locations->fattr);
2993
2994 /* replace the lookup nfs_fattr with the locations nfs_fattr */
2995 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2996 memset(fhandle, 0, sizeof(struct nfs_fh));
2997out:
2998 if (page)
2999 __free_page(page);
3000 kfree(locations);
3001 return status;
3002}
3003
3004static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3005 struct nfs_fattr *fattr, struct nfs4_label *label)
3006{
3007 struct nfs4_getattr_arg args = {
3008 .fh = fhandle,
3009 .bitmask = server->attr_bitmask,
3010 };
3011 struct nfs4_getattr_res res = {
3012 .fattr = fattr,
3013 .label = label,
3014 .server = server,
3015 };
3016 struct rpc_message msg = {
3017 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3018 .rpc_argp = &args,
3019 .rpc_resp = &res,
3020 };
3021
3022 args.bitmask = nfs4_bitmask(server, label);
3023
3024 nfs_fattr_init(fattr);
3025 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3026}
3027
3028static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3029 struct nfs_fattr *fattr, struct nfs4_label *label)
3030{
3031 struct nfs4_exception exception = { };
3032 int err;
3033 do {
3034 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3035 trace_nfs4_getattr(server, fhandle, fattr, err);
3036 err = nfs4_handle_exception(server, err,
3037 &exception);
3038 } while (exception.retry);
3039 return err;
3040}
3041
3042/*
3043 * The file is not closed if it is opened due to the a request to change
3044 * the size of the file. The open call will not be needed once the
3045 * VFS layer lookup-intents are implemented.
3046 *
3047 * Close is called when the inode is destroyed.
3048 * If we haven't opened the file for O_WRONLY, we
3049 * need to in the size_change case to obtain a stateid.
3050 *
3051 * Got race?
3052 * Because OPEN is always done by name in nfsv4, it is
3053 * possible that we opened a different file by the same
3054 * name. We can recognize this race condition, but we
3055 * can't do anything about it besides returning an error.
3056 *
3057 * This will be fixed with VFS changes (lookup-intent).
3058 */
3059static int
3060nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3061 struct iattr *sattr)
3062{
3063 struct inode *inode = dentry->d_inode;
3064 struct rpc_cred *cred = NULL;
3065 struct nfs4_state *state = NULL;
3066 struct nfs4_label *label = NULL;
3067 int status;
3068
3069 if (pnfs_ld_layoutret_on_setattr(inode))
3070 pnfs_commit_and_return_layout(inode);
3071
3072 nfs_fattr_init(fattr);
3073
3074 /* Deal with open(O_TRUNC) */
3075 if (sattr->ia_valid & ATTR_OPEN)
3076 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3077
3078 /* Optimization: if the end result is no change, don't RPC */
3079 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3080 return 0;
3081
3082 /* Search for an existing open(O_WRITE) file */
3083 if (sattr->ia_valid & ATTR_FILE) {
3084 struct nfs_open_context *ctx;
3085
3086 ctx = nfs_file_open_context(sattr->ia_file);
3087 if (ctx) {
3088 cred = ctx->cred;
3089 state = ctx->state;
3090 }
3091 }
3092
3093 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3094 if (IS_ERR(label))
3095 return PTR_ERR(label);
3096
3097 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3098 if (status == 0) {
3099 nfs_setattr_update_inode(inode, sattr);
3100 nfs_setsecurity(inode, fattr, label);
3101 }
3102 nfs4_label_free(label);
3103 return status;
3104}
3105
3106static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3107 const struct qstr *name, struct nfs_fh *fhandle,
3108 struct nfs_fattr *fattr, struct nfs4_label *label)
3109{
3110 struct nfs_server *server = NFS_SERVER(dir);
3111 int status;
3112 struct nfs4_lookup_arg args = {
3113 .bitmask = server->attr_bitmask,
3114 .dir_fh = NFS_FH(dir),
3115 .name = name,
3116 };
3117 struct nfs4_lookup_res res = {
3118 .server = server,
3119 .fattr = fattr,
3120 .label = label,
3121 .fh = fhandle,
3122 };
3123 struct rpc_message msg = {
3124 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3125 .rpc_argp = &args,
3126 .rpc_resp = &res,
3127 };
3128
3129 args.bitmask = nfs4_bitmask(server, label);
3130
3131 nfs_fattr_init(fattr);
3132
3133 dprintk("NFS call lookup %s\n", name->name);
3134 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3135 dprintk("NFS reply lookup: %d\n", status);
3136 return status;
3137}
3138
3139static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3140{
3141 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3142 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3143 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3144 fattr->nlink = 2;
3145}
3146
3147static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3148 struct qstr *name, struct nfs_fh *fhandle,
3149 struct nfs_fattr *fattr, struct nfs4_label *label)
3150{
3151 struct nfs4_exception exception = { };
3152 struct rpc_clnt *client = *clnt;
3153 int err;
3154 do {
3155 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3156 trace_nfs4_lookup(dir, name, err);
3157 switch (err) {
3158 case -NFS4ERR_BADNAME:
3159 err = -ENOENT;
3160 goto out;
3161 case -NFS4ERR_MOVED:
3162 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3163 goto out;
3164 case -NFS4ERR_WRONGSEC:
3165 err = -EPERM;
3166 if (client != *clnt)
3167 goto out;
3168 /* No security negotiation if the user specified 'sec=' */
3169 if (NFS_SERVER(dir)->flags & NFS_MOUNT_SECFLAVOUR)
3170 goto out;
3171 client = nfs4_create_sec_client(client, dir, name);
3172 if (IS_ERR(client))
3173 return PTR_ERR(client);
3174
3175 exception.retry = 1;
3176 break;
3177 default:
3178 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3179 }
3180 } while (exception.retry);
3181
3182out:
3183 if (err == 0)
3184 *clnt = client;
3185 else if (client != *clnt)
3186 rpc_shutdown_client(client);
3187
3188 return err;
3189}
3190
3191static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3192 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3193 struct nfs4_label *label)
3194{
3195 int status;
3196 struct rpc_clnt *client = NFS_CLIENT(dir);
3197
3198 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3199 if (client != NFS_CLIENT(dir)) {
3200 rpc_shutdown_client(client);
3201 nfs_fixup_secinfo_attributes(fattr);
3202 }
3203 return status;
3204}
3205
3206struct rpc_clnt *
3207nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3208 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3209{
3210 struct rpc_clnt *client = NFS_CLIENT(dir);
3211 int status;
3212
3213 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3214 if (status < 0)
3215 return ERR_PTR(status);
3216 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3217}
3218
3219static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3220{
3221 struct nfs_server *server = NFS_SERVER(inode);
3222 struct nfs4_accessargs args = {
3223 .fh = NFS_FH(inode),
3224 .bitmask = server->cache_consistency_bitmask,
3225 };
3226 struct nfs4_accessres res = {
3227 .server = server,
3228 };
3229 struct rpc_message msg = {
3230 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3231 .rpc_argp = &args,
3232 .rpc_resp = &res,
3233 .rpc_cred = entry->cred,
3234 };
3235 int mode = entry->mask;
3236 int status = 0;
3237
3238 /*
3239 * Determine which access bits we want to ask for...
3240 */
3241 if (mode & MAY_READ)
3242 args.access |= NFS4_ACCESS_READ;
3243 if (S_ISDIR(inode->i_mode)) {
3244 if (mode & MAY_WRITE)
3245 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3246 if (mode & MAY_EXEC)
3247 args.access |= NFS4_ACCESS_LOOKUP;
3248 } else {
3249 if (mode & MAY_WRITE)
3250 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3251 if (mode & MAY_EXEC)
3252 args.access |= NFS4_ACCESS_EXECUTE;
3253 }
3254
3255 res.fattr = nfs_alloc_fattr();
3256 if (res.fattr == NULL)
3257 return -ENOMEM;
3258
3259 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3260 if (!status) {
3261 nfs_access_set_mask(entry, res.access);
3262 nfs_refresh_inode(inode, res.fattr);
3263 }
3264 nfs_free_fattr(res.fattr);
3265 return status;
3266}
3267
3268static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3269{
3270 struct nfs4_exception exception = { };
3271 int err;
3272 do {
3273 err = _nfs4_proc_access(inode, entry);
3274 trace_nfs4_access(inode, err);
3275 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3276 &exception);
3277 } while (exception.retry);
3278 return err;
3279}
3280
3281/*
3282 * TODO: For the time being, we don't try to get any attributes
3283 * along with any of the zero-copy operations READ, READDIR,
3284 * READLINK, WRITE.
3285 *
3286 * In the case of the first three, we want to put the GETATTR
3287 * after the read-type operation -- this is because it is hard
3288 * to predict the length of a GETATTR response in v4, and thus
3289 * align the READ data correctly. This means that the GETATTR
3290 * may end up partially falling into the page cache, and we should
3291 * shift it into the 'tail' of the xdr_buf before processing.
3292 * To do this efficiently, we need to know the total length
3293 * of data received, which doesn't seem to be available outside
3294 * of the RPC layer.
3295 *
3296 * In the case of WRITE, we also want to put the GETATTR after
3297 * the operation -- in this case because we want to make sure
3298 * we get the post-operation mtime and size.
3299 *
3300 * Both of these changes to the XDR layer would in fact be quite
3301 * minor, but I decided to leave them for a subsequent patch.
3302 */
3303static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3304 unsigned int pgbase, unsigned int pglen)
3305{
3306 struct nfs4_readlink args = {
3307 .fh = NFS_FH(inode),
3308 .pgbase = pgbase,
3309 .pglen = pglen,
3310 .pages = &page,
3311 };
3312 struct nfs4_readlink_res res;
3313 struct rpc_message msg = {
3314 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3315 .rpc_argp = &args,
3316 .rpc_resp = &res,
3317 };
3318
3319 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3320}
3321
3322static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3323 unsigned int pgbase, unsigned int pglen)
3324{
3325 struct nfs4_exception exception = { };
3326 int err;
3327 do {
3328 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3329 trace_nfs4_readlink(inode, err);
3330 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3331 &exception);
3332 } while (exception.retry);
3333 return err;
3334}
3335
3336/*
3337 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3338 */
3339static int
3340nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3341 int flags)
3342{
3343 struct nfs4_label l, *ilabel = NULL;
3344 struct nfs_open_context *ctx;
3345 struct nfs4_state *state;
3346 int opened = 0;
3347 int status = 0;
3348
3349 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3350 if (IS_ERR(ctx))
3351 return PTR_ERR(ctx);
3352
3353 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3354
3355 sattr->ia_mode &= ~current_umask();
3356 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3357 if (IS_ERR(state)) {
3358 status = PTR_ERR(state);
3359 goto out;
3360 }
3361out:
3362 nfs4_label_release_security(ilabel);
3363 put_nfs_open_context(ctx);
3364 return status;
3365}
3366
3367static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3368{
3369 struct nfs_server *server = NFS_SERVER(dir);
3370 struct nfs_removeargs args = {
3371 .fh = NFS_FH(dir),
3372 .name = *name,
3373 };
3374 struct nfs_removeres res = {
3375 .server = server,
3376 };
3377 struct rpc_message msg = {
3378 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3379 .rpc_argp = &args,
3380 .rpc_resp = &res,
3381 };
3382 int status;
3383
3384 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3385 if (status == 0)
3386 update_changeattr(dir, &res.cinfo);
3387 return status;
3388}
3389
3390static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3391{
3392 struct nfs4_exception exception = { };
3393 int err;
3394 do {
3395 err = _nfs4_proc_remove(dir, name);
3396 trace_nfs4_remove(dir, name, err);
3397 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3398 &exception);
3399 } while (exception.retry);
3400 return err;
3401}
3402
3403static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3404{
3405 struct nfs_server *server = NFS_SERVER(dir);
3406 struct nfs_removeargs *args = msg->rpc_argp;
3407 struct nfs_removeres *res = msg->rpc_resp;
3408
3409 res->server = server;
3410 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3411 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3412
3413 nfs_fattr_init(res->dir_attr);
3414}
3415
3416static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3417{
3418 nfs4_setup_sequence(NFS_SERVER(data->dir),
3419 &data->args.seq_args,
3420 &data->res.seq_res,
3421 task);
3422}
3423
3424static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3425{
3426 struct nfs_unlinkdata *data = task->tk_calldata;
3427 struct nfs_removeres *res = &data->res;
3428
3429 if (!nfs4_sequence_done(task, &res->seq_res))
3430 return 0;
3431 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3432 return 0;
3433 update_changeattr(dir, &res->cinfo);
3434 return 1;
3435}
3436
3437static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3438{
3439 struct nfs_server *server = NFS_SERVER(dir);
3440 struct nfs_renameargs *arg = msg->rpc_argp;
3441 struct nfs_renameres *res = msg->rpc_resp;
3442
3443 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3444 res->server = server;
3445 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3446}
3447
3448static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3449{
3450 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3451 &data->args.seq_args,
3452 &data->res.seq_res,
3453 task);
3454}
3455
3456static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3457 struct inode *new_dir)
3458{
3459 struct nfs_renamedata *data = task->tk_calldata;
3460 struct nfs_renameres *res = &data->res;
3461
3462 if (!nfs4_sequence_done(task, &res->seq_res))
3463 return 0;
3464 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3465 return 0;
3466
3467 update_changeattr(old_dir, &res->old_cinfo);
3468 update_changeattr(new_dir, &res->new_cinfo);
3469 return 1;
3470}
3471
3472static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3473 struct inode *new_dir, struct qstr *new_name)
3474{
3475 struct nfs_server *server = NFS_SERVER(old_dir);
3476 struct nfs_renameargs arg = {
3477 .old_dir = NFS_FH(old_dir),
3478 .new_dir = NFS_FH(new_dir),
3479 .old_name = old_name,
3480 .new_name = new_name,
3481 };
3482 struct nfs_renameres res = {
3483 .server = server,
3484 };
3485 struct rpc_message msg = {
3486 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3487 .rpc_argp = &arg,
3488 .rpc_resp = &res,
3489 };
3490 int status = -ENOMEM;
3491
3492 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3493 if (!status) {
3494 update_changeattr(old_dir, &res.old_cinfo);
3495 update_changeattr(new_dir, &res.new_cinfo);
3496 }
3497 return status;
3498}
3499
3500static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3501 struct inode *new_dir, struct qstr *new_name)
3502{
3503 struct nfs4_exception exception = { };
3504 int err;
3505 do {
3506 err = _nfs4_proc_rename(old_dir, old_name,
3507 new_dir, new_name);
3508 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3509 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3510 &exception);
3511 } while (exception.retry);
3512 return err;
3513}
3514
3515static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3516{
3517 struct nfs_server *server = NFS_SERVER(inode);
3518 struct nfs4_link_arg arg = {
3519 .fh = NFS_FH(inode),
3520 .dir_fh = NFS_FH(dir),
3521 .name = name,
3522 .bitmask = server->attr_bitmask,
3523 };
3524 struct nfs4_link_res res = {
3525 .server = server,
3526 .label = NULL,
3527 };
3528 struct rpc_message msg = {
3529 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3530 .rpc_argp = &arg,
3531 .rpc_resp = &res,
3532 };
3533 int status = -ENOMEM;
3534
3535 res.fattr = nfs_alloc_fattr();
3536 if (res.fattr == NULL)
3537 goto out;
3538
3539 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3540 if (IS_ERR(res.label)) {
3541 status = PTR_ERR(res.label);
3542 goto out;
3543 }
3544 arg.bitmask = nfs4_bitmask(server, res.label);
3545
3546 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3547 if (!status) {
3548 update_changeattr(dir, &res.cinfo);
3549 status = nfs_post_op_update_inode(inode, res.fattr);
3550 if (!status)
3551 nfs_setsecurity(inode, res.fattr, res.label);
3552 }
3553
3554
3555 nfs4_label_free(res.label);
3556
3557out:
3558 nfs_free_fattr(res.fattr);
3559 return status;
3560}
3561
3562static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3563{
3564 struct nfs4_exception exception = { };
3565 int err;
3566 do {
3567 err = nfs4_handle_exception(NFS_SERVER(inode),
3568 _nfs4_proc_link(inode, dir, name),
3569 &exception);
3570 } while (exception.retry);
3571 return err;
3572}
3573
3574struct nfs4_createdata {
3575 struct rpc_message msg;
3576 struct nfs4_create_arg arg;
3577 struct nfs4_create_res res;
3578 struct nfs_fh fh;
3579 struct nfs_fattr fattr;
3580 struct nfs4_label *label;
3581};
3582
3583static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3584 struct qstr *name, struct iattr *sattr, u32 ftype)
3585{
3586 struct nfs4_createdata *data;
3587
3588 data = kzalloc(sizeof(*data), GFP_KERNEL);
3589 if (data != NULL) {
3590 struct nfs_server *server = NFS_SERVER(dir);
3591
3592 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3593 if (IS_ERR(data->label))
3594 goto out_free;
3595
3596 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3597 data->msg.rpc_argp = &data->arg;
3598 data->msg.rpc_resp = &data->res;
3599 data->arg.dir_fh = NFS_FH(dir);
3600 data->arg.server = server;
3601 data->arg.name = name;
3602 data->arg.attrs = sattr;
3603 data->arg.ftype = ftype;
3604 data->arg.bitmask = nfs4_bitmask(server, data->label);
3605 data->res.server = server;
3606 data->res.fh = &data->fh;
3607 data->res.fattr = &data->fattr;
3608 data->res.label = data->label;
3609 nfs_fattr_init(data->res.fattr);
3610 }
3611 return data;
3612out_free:
3613 kfree(data);
3614 return NULL;
3615}
3616
3617static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3618{
3619 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3620 &data->arg.seq_args, &data->res.seq_res, 1);
3621 if (status == 0) {
3622 update_changeattr(dir, &data->res.dir_cinfo);
3623 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3624 }
3625 return status;
3626}
3627
3628static void nfs4_free_createdata(struct nfs4_createdata *data)
3629{
3630 nfs4_label_free(data->label);
3631 kfree(data);
3632}
3633
3634static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3635 struct page *page, unsigned int len, struct iattr *sattr,
3636 struct nfs4_label *label)
3637{
3638 struct nfs4_createdata *data;
3639 int status = -ENAMETOOLONG;
3640
3641 if (len > NFS4_MAXPATHLEN)
3642 goto out;
3643
3644 status = -ENOMEM;
3645 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3646 if (data == NULL)
3647 goto out;
3648
3649 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3650 data->arg.u.symlink.pages = &page;
3651 data->arg.u.symlink.len = len;
3652 data->arg.label = label;
3653
3654 status = nfs4_do_create(dir, dentry, data);
3655
3656 nfs4_free_createdata(data);
3657out:
3658 return status;
3659}
3660
3661static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3662 struct page *page, unsigned int len, struct iattr *sattr)
3663{
3664 struct nfs4_exception exception = { };
3665 struct nfs4_label l, *label = NULL;
3666 int err;
3667
3668 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3669
3670 do {
3671 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3672 trace_nfs4_symlink(dir, &dentry->d_name, err);
3673 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3674 &exception);
3675 } while (exception.retry);
3676
3677 nfs4_label_release_security(label);
3678 return err;
3679}
3680
3681static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3682 struct iattr *sattr, struct nfs4_label *label)
3683{
3684 struct nfs4_createdata *data;
3685 int status = -ENOMEM;
3686
3687 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3688 if (data == NULL)
3689 goto out;
3690
3691 data->arg.label = label;
3692 status = nfs4_do_create(dir, dentry, data);
3693
3694 nfs4_free_createdata(data);
3695out:
3696 return status;
3697}
3698
3699static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3700 struct iattr *sattr)
3701{
3702 struct nfs4_exception exception = { };
3703 struct nfs4_label l, *label = NULL;
3704 int err;
3705
3706 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3707
3708 sattr->ia_mode &= ~current_umask();
3709 do {
3710 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3711 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3712 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3713 &exception);
3714 } while (exception.retry);
3715 nfs4_label_release_security(label);
3716
3717 return err;
3718}
3719
3720static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3721 u64 cookie, struct page **pages, unsigned int count, int plus)
3722{
3723 struct inode *dir = dentry->d_inode;
3724 struct nfs4_readdir_arg args = {
3725 .fh = NFS_FH(dir),
3726 .pages = pages,
3727 .pgbase = 0,
3728 .count = count,
3729 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3730 .plus = plus,
3731 };
3732 struct nfs4_readdir_res res;
3733 struct rpc_message msg = {
3734 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3735 .rpc_argp = &args,
3736 .rpc_resp = &res,
3737 .rpc_cred = cred,
3738 };
3739 int status;
3740
3741 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3742 dentry->d_parent->d_name.name,
3743 dentry->d_name.name,
3744 (unsigned long long)cookie);
3745 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3746 res.pgbase = args.pgbase;
3747 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3748 if (status >= 0) {
3749 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3750 status += args.pgbase;
3751 }
3752
3753 nfs_invalidate_atime(dir);
3754
3755 dprintk("%s: returns %d\n", __func__, status);
3756 return status;
3757}
3758
3759static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3760 u64 cookie, struct page **pages, unsigned int count, int plus)
3761{
3762 struct nfs4_exception exception = { };
3763 int err;
3764 do {
3765 err = _nfs4_proc_readdir(dentry, cred, cookie,
3766 pages, count, plus);
3767 trace_nfs4_readdir(dentry->d_inode, err);
3768 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3769 &exception);
3770 } while (exception.retry);
3771 return err;
3772}
3773
3774static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3775 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3776{
3777 struct nfs4_createdata *data;
3778 int mode = sattr->ia_mode;
3779 int status = -ENOMEM;
3780
3781 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3782 if (data == NULL)
3783 goto out;
3784
3785 if (S_ISFIFO(mode))
3786 data->arg.ftype = NF4FIFO;
3787 else if (S_ISBLK(mode)) {
3788 data->arg.ftype = NF4BLK;
3789 data->arg.u.device.specdata1 = MAJOR(rdev);
3790 data->arg.u.device.specdata2 = MINOR(rdev);
3791 }
3792 else if (S_ISCHR(mode)) {
3793 data->arg.ftype = NF4CHR;
3794 data->arg.u.device.specdata1 = MAJOR(rdev);
3795 data->arg.u.device.specdata2 = MINOR(rdev);
3796 } else if (!S_ISSOCK(mode)) {
3797 status = -EINVAL;
3798 goto out_free;
3799 }
3800
3801 data->arg.label = label;
3802 status = nfs4_do_create(dir, dentry, data);
3803out_free:
3804 nfs4_free_createdata(data);
3805out:
3806 return status;
3807}
3808
3809static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3810 struct iattr *sattr, dev_t rdev)
3811{
3812 struct nfs4_exception exception = { };
3813 struct nfs4_label l, *label = NULL;
3814 int err;
3815
3816 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3817
3818 sattr->ia_mode &= ~current_umask();
3819 do {
3820 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3821 trace_nfs4_mknod(dir, &dentry->d_name, err);
3822 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3823 &exception);
3824 } while (exception.retry);
3825
3826 nfs4_label_release_security(label);
3827
3828 return err;
3829}
3830
3831static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3832 struct nfs_fsstat *fsstat)
3833{
3834 struct nfs4_statfs_arg args = {
3835 .fh = fhandle,
3836 .bitmask = server->attr_bitmask,
3837 };
3838 struct nfs4_statfs_res res = {
3839 .fsstat = fsstat,
3840 };
3841 struct rpc_message msg = {
3842 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3843 .rpc_argp = &args,
3844 .rpc_resp = &res,
3845 };
3846
3847 nfs_fattr_init(fsstat->fattr);
3848 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3849}
3850
3851static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3852{
3853 struct nfs4_exception exception = { };
3854 int err;
3855 do {
3856 err = nfs4_handle_exception(server,
3857 _nfs4_proc_statfs(server, fhandle, fsstat),
3858 &exception);
3859 } while (exception.retry);
3860 return err;
3861}
3862
3863static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3864 struct nfs_fsinfo *fsinfo)
3865{
3866 struct nfs4_fsinfo_arg args = {
3867 .fh = fhandle,
3868 .bitmask = server->attr_bitmask,
3869 };
3870 struct nfs4_fsinfo_res res = {
3871 .fsinfo = fsinfo,
3872 };
3873 struct rpc_message msg = {
3874 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3875 .rpc_argp = &args,
3876 .rpc_resp = &res,
3877 };
3878
3879 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3880}
3881
3882static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3883{
3884 struct nfs4_exception exception = { };
3885 unsigned long now = jiffies;
3886 int err;
3887
3888 do {
3889 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3890 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3891 if (err == 0) {
3892 struct nfs_client *clp = server->nfs_client;
3893
3894 spin_lock(&clp->cl_lock);
3895 clp->cl_lease_time = fsinfo->lease_time * HZ;
3896 clp->cl_last_renewal = now;
3897 spin_unlock(&clp->cl_lock);
3898 break;
3899 }
3900 err = nfs4_handle_exception(server, err, &exception);
3901 } while (exception.retry);
3902 return err;
3903}
3904
3905static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3906{
3907 int error;
3908
3909 nfs_fattr_init(fsinfo->fattr);
3910 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3911 if (error == 0) {
3912 /* block layout checks this! */
3913 server->pnfs_blksize = fsinfo->blksize;
3914 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3915 }
3916
3917 return error;
3918}
3919
3920static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3921 struct nfs_pathconf *pathconf)
3922{
3923 struct nfs4_pathconf_arg args = {
3924 .fh = fhandle,
3925 .bitmask = server->attr_bitmask,
3926 };
3927 struct nfs4_pathconf_res res = {
3928 .pathconf = pathconf,
3929 };
3930 struct rpc_message msg = {
3931 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3932 .rpc_argp = &args,
3933 .rpc_resp = &res,
3934 };
3935
3936 /* None of the pathconf attributes are mandatory to implement */
3937 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3938 memset(pathconf, 0, sizeof(*pathconf));
3939 return 0;
3940 }
3941
3942 nfs_fattr_init(pathconf->fattr);
3943 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3944}
3945
3946static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3947 struct nfs_pathconf *pathconf)
3948{
3949 struct nfs4_exception exception = { };
3950 int err;
3951
3952 do {
3953 err = nfs4_handle_exception(server,
3954 _nfs4_proc_pathconf(server, fhandle, pathconf),
3955 &exception);
3956 } while (exception.retry);
3957 return err;
3958}
3959
3960int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3961 const struct nfs_open_context *ctx,
3962 const struct nfs_lock_context *l_ctx,
3963 fmode_t fmode)
3964{
3965 const struct nfs_lockowner *lockowner = NULL;
3966
3967 if (l_ctx != NULL)
3968 lockowner = &l_ctx->lockowner;
3969 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3970}
3971EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3972
3973static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3974 const struct nfs_open_context *ctx,
3975 const struct nfs_lock_context *l_ctx,
3976 fmode_t fmode)
3977{
3978 nfs4_stateid current_stateid;
3979
3980 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3981 return false;
3982 return nfs4_stateid_match(stateid, &current_stateid);
3983}
3984
3985static bool nfs4_error_stateid_expired(int err)
3986{
3987 switch (err) {
3988 case -NFS4ERR_DELEG_REVOKED:
3989 case -NFS4ERR_ADMIN_REVOKED:
3990 case -NFS4ERR_BAD_STATEID:
3991 case -NFS4ERR_STALE_STATEID:
3992 case -NFS4ERR_OLD_STATEID:
3993 case -NFS4ERR_OPENMODE:
3994 case -NFS4ERR_EXPIRED:
3995 return true;
3996 }
3997 return false;
3998}
3999
4000void __nfs4_read_done_cb(struct nfs_read_data *data)
4001{
4002 nfs_invalidate_atime(data->header->inode);
4003}
4004
4005static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4006{
4007 struct nfs_server *server = NFS_SERVER(data->header->inode);
4008
4009 trace_nfs4_read(data, task->tk_status);
4010 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4011 rpc_restart_call_prepare(task);
4012 return -EAGAIN;
4013 }
4014
4015 __nfs4_read_done_cb(data);
4016 if (task->tk_status > 0)
4017 renew_lease(server, data->timestamp);
4018 return 0;
4019}
4020
4021static bool nfs4_read_stateid_changed(struct rpc_task *task,
4022 struct nfs_readargs *args)
4023{
4024
4025 if (!nfs4_error_stateid_expired(task->tk_status) ||
4026 nfs4_stateid_is_current(&args->stateid,
4027 args->context,
4028 args->lock_context,
4029 FMODE_READ))
4030 return false;
4031 rpc_restart_call_prepare(task);
4032 return true;
4033}
4034
4035static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4036{
4037
4038 dprintk("--> %s\n", __func__);
4039
4040 if (!nfs4_sequence_done(task, &data->res.seq_res))
4041 return -EAGAIN;
4042 if (nfs4_read_stateid_changed(task, &data->args))
4043 return -EAGAIN;
4044 return data->read_done_cb ? data->read_done_cb(task, data) :
4045 nfs4_read_done_cb(task, data);
4046}
4047
4048static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4049{
4050 data->timestamp = jiffies;
4051 data->read_done_cb = nfs4_read_done_cb;
4052 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4053 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4054}
4055
4056static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4057{
4058 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4059 &data->args.seq_args,
4060 &data->res.seq_res,
4061 task))
4062 return 0;
4063 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4064 data->args.lock_context, FMODE_READ) == -EIO)
4065 return -EIO;
4066 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4067 return -EIO;
4068 return 0;
4069}
4070
4071static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4072{
4073 struct inode *inode = data->header->inode;
4074
4075 trace_nfs4_write(data, task->tk_status);
4076 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4077 rpc_restart_call_prepare(task);
4078 return -EAGAIN;
4079 }
4080 if (task->tk_status >= 0) {
4081 renew_lease(NFS_SERVER(inode), data->timestamp);
4082 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4083 }
4084 return 0;
4085}
4086
4087static bool nfs4_write_stateid_changed(struct rpc_task *task,
4088 struct nfs_writeargs *args)
4089{
4090
4091 if (!nfs4_error_stateid_expired(task->tk_status) ||
4092 nfs4_stateid_is_current(&args->stateid,
4093 args->context,
4094 args->lock_context,
4095 FMODE_WRITE))
4096 return false;
4097 rpc_restart_call_prepare(task);
4098 return true;
4099}
4100
4101static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4102{
4103 if (!nfs4_sequence_done(task, &data->res.seq_res))
4104 return -EAGAIN;
4105 if (nfs4_write_stateid_changed(task, &data->args))
4106 return -EAGAIN;
4107 return data->write_done_cb ? data->write_done_cb(task, data) :
4108 nfs4_write_done_cb(task, data);
4109}
4110
4111static
4112bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4113{
4114 const struct nfs_pgio_header *hdr = data->header;
4115
4116 /* Don't request attributes for pNFS or O_DIRECT writes */
4117 if (data->ds_clp != NULL || hdr->dreq != NULL)
4118 return false;
4119 /* Otherwise, request attributes if and only if we don't hold
4120 * a delegation
4121 */
4122 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4123}
4124
4125static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4126{
4127 struct nfs_server *server = NFS_SERVER(data->header->inode);
4128
4129 if (!nfs4_write_need_cache_consistency_data(data)) {
4130 data->args.bitmask = NULL;
4131 data->res.fattr = NULL;
4132 } else
4133 data->args.bitmask = server->cache_consistency_bitmask;
4134
4135 if (!data->write_done_cb)
4136 data->write_done_cb = nfs4_write_done_cb;
4137 data->res.server = server;
4138 data->timestamp = jiffies;
4139
4140 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4141 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4142}
4143
4144static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4145{
4146 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4147 &data->args.seq_args,
4148 &data->res.seq_res,
4149 task))
4150 return 0;
4151 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4152 data->args.lock_context, FMODE_WRITE) == -EIO)
4153 return -EIO;
4154 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4155 return -EIO;
4156 return 0;
4157}
4158
4159static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4160{
4161 nfs4_setup_sequence(NFS_SERVER(data->inode),
4162 &data->args.seq_args,
4163 &data->res.seq_res,
4164 task);
4165}
4166
4167static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4168{
4169 struct inode *inode = data->inode;
4170
4171 trace_nfs4_commit(data, task->tk_status);
4172 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4173 rpc_restart_call_prepare(task);
4174 return -EAGAIN;
4175 }
4176 return 0;
4177}
4178
4179static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4180{
4181 if (!nfs4_sequence_done(task, &data->res.seq_res))
4182 return -EAGAIN;
4183 return data->commit_done_cb(task, data);
4184}
4185
4186static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4187{
4188 struct nfs_server *server = NFS_SERVER(data->inode);
4189
4190 if (data->commit_done_cb == NULL)
4191 data->commit_done_cb = nfs4_commit_done_cb;
4192 data->res.server = server;
4193 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4194 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4195}
4196
4197struct nfs4_renewdata {
4198 struct nfs_client *client;
4199 unsigned long timestamp;
4200};
4201
4202/*
4203 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4204 * standalone procedure for queueing an asynchronous RENEW.
4205 */
4206static void nfs4_renew_release(void *calldata)
4207{
4208 struct nfs4_renewdata *data = calldata;
4209 struct nfs_client *clp = data->client;
4210
4211 if (atomic_read(&clp->cl_count) > 1)
4212 nfs4_schedule_state_renewal(clp);
4213 nfs_put_client(clp);
4214 kfree(data);
4215}
4216
4217static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4218{
4219 struct nfs4_renewdata *data = calldata;
4220 struct nfs_client *clp = data->client;
4221 unsigned long timestamp = data->timestamp;
4222
4223 trace_nfs4_renew_async(clp, task->tk_status);
4224 if (task->tk_status < 0) {
4225 /* Unless we're shutting down, schedule state recovery! */
4226 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4227 return;
4228 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4229 nfs4_schedule_lease_recovery(clp);
4230 return;
4231 }
4232 nfs4_schedule_path_down_recovery(clp);
4233 }
4234 do_renew_lease(clp, timestamp);
4235}
4236
4237static const struct rpc_call_ops nfs4_renew_ops = {
4238 .rpc_call_done = nfs4_renew_done,
4239 .rpc_release = nfs4_renew_release,
4240};
4241
4242static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4243{
4244 struct rpc_message msg = {
4245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4246 .rpc_argp = clp,
4247 .rpc_cred = cred,
4248 };
4249 struct nfs4_renewdata *data;
4250
4251 if (renew_flags == 0)
4252 return 0;
4253 if (!atomic_inc_not_zero(&clp->cl_count))
4254 return -EIO;
4255 data = kmalloc(sizeof(*data), GFP_NOFS);
4256 if (data == NULL)
4257 return -ENOMEM;
4258 data->client = clp;
4259 data->timestamp = jiffies;
4260 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4261 &nfs4_renew_ops, data);
4262}
4263
4264static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4265{
4266 struct rpc_message msg = {
4267 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4268 .rpc_argp = clp,
4269 .rpc_cred = cred,
4270 };
4271 unsigned long now = jiffies;
4272 int status;
4273
4274 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4275 if (status < 0)
4276 return status;
4277 do_renew_lease(clp, now);
4278 return 0;
4279}
4280
4281static inline int nfs4_server_supports_acls(struct nfs_server *server)
4282{
4283 return (server->caps & NFS_CAP_ACLS)
4284 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4285 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4286}
4287
4288/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4289 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4290 * the stack.
4291 */
4292#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4293
4294static int buf_to_pages_noslab(const void *buf, size_t buflen,
4295 struct page **pages, unsigned int *pgbase)
4296{
4297 struct page *newpage, **spages;
4298 int rc = 0;
4299 size_t len;
4300 spages = pages;
4301
4302 do {
4303 len = min_t(size_t, PAGE_SIZE, buflen);
4304 newpage = alloc_page(GFP_KERNEL);
4305
4306 if (newpage == NULL)
4307 goto unwind;
4308 memcpy(page_address(newpage), buf, len);
4309 buf += len;
4310 buflen -= len;
4311 *pages++ = newpage;
4312 rc++;
4313 } while (buflen != 0);
4314
4315 return rc;
4316
4317unwind:
4318 for(; rc > 0; rc--)
4319 __free_page(spages[rc-1]);
4320 return -ENOMEM;
4321}
4322
4323struct nfs4_cached_acl {
4324 int cached;
4325 size_t len;
4326 char data[0];
4327};
4328
4329static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4330{
4331 struct nfs_inode *nfsi = NFS_I(inode);
4332
4333 spin_lock(&inode->i_lock);
4334 kfree(nfsi->nfs4_acl);
4335 nfsi->nfs4_acl = acl;
4336 spin_unlock(&inode->i_lock);
4337}
4338
4339static void nfs4_zap_acl_attr(struct inode *inode)
4340{
4341 nfs4_set_cached_acl(inode, NULL);
4342}
4343
4344static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4345{
4346 struct nfs_inode *nfsi = NFS_I(inode);
4347 struct nfs4_cached_acl *acl;
4348 int ret = -ENOENT;
4349
4350 spin_lock(&inode->i_lock);
4351 acl = nfsi->nfs4_acl;
4352 if (acl == NULL)
4353 goto out;
4354 if (buf == NULL) /* user is just asking for length */
4355 goto out_len;
4356 if (acl->cached == 0)
4357 goto out;
4358 ret = -ERANGE; /* see getxattr(2) man page */
4359 if (acl->len > buflen)
4360 goto out;
4361 memcpy(buf, acl->data, acl->len);
4362out_len:
4363 ret = acl->len;
4364out:
4365 spin_unlock(&inode->i_lock);
4366 return ret;
4367}
4368
4369static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4370{
4371 struct nfs4_cached_acl *acl;
4372 size_t buflen = sizeof(*acl) + acl_len;
4373
4374 if (buflen <= PAGE_SIZE) {
4375 acl = kmalloc(buflen, GFP_KERNEL);
4376 if (acl == NULL)
4377 goto out;
4378 acl->cached = 1;
4379 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4380 } else {
4381 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4382 if (acl == NULL)
4383 goto out;
4384 acl->cached = 0;
4385 }
4386 acl->len = acl_len;
4387out:
4388 nfs4_set_cached_acl(inode, acl);
4389}
4390
4391/*
4392 * The getxattr API returns the required buffer length when called with a
4393 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4394 * the required buf. On a NULL buf, we send a page of data to the server
4395 * guessing that the ACL request can be serviced by a page. If so, we cache
4396 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4397 * the cache. If not so, we throw away the page, and cache the required
4398 * length. The next getxattr call will then produce another round trip to
4399 * the server, this time with the input buf of the required size.
4400 */
4401static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4402{
4403 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4404 struct nfs_getaclargs args = {
4405 .fh = NFS_FH(inode),
4406 .acl_pages = pages,
4407 .acl_len = buflen,
4408 };
4409 struct nfs_getaclres res = {
4410 .acl_len = buflen,
4411 };
4412 struct rpc_message msg = {
4413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4414 .rpc_argp = &args,
4415 .rpc_resp = &res,
4416 };
4417 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4418 int ret = -ENOMEM, i;
4419
4420 /* As long as we're doing a round trip to the server anyway,
4421 * let's be prepared for a page of acl data. */
4422 if (npages == 0)
4423 npages = 1;
4424 if (npages > ARRAY_SIZE(pages))
4425 return -ERANGE;
4426
4427 for (i = 0; i < npages; i++) {
4428 pages[i] = alloc_page(GFP_KERNEL);
4429 if (!pages[i])
4430 goto out_free;
4431 }
4432
4433 /* for decoding across pages */
4434 res.acl_scratch = alloc_page(GFP_KERNEL);
4435 if (!res.acl_scratch)
4436 goto out_free;
4437
4438 args.acl_len = npages * PAGE_SIZE;
4439 args.acl_pgbase = 0;
4440
4441 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4442 __func__, buf, buflen, npages, args.acl_len);
4443 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4444 &msg, &args.seq_args, &res.seq_res, 0);
4445 if (ret)
4446 goto out_free;
4447
4448 /* Handle the case where the passed-in buffer is too short */
4449 if (res.acl_flags & NFS4_ACL_TRUNC) {
4450 /* Did the user only issue a request for the acl length? */
4451 if (buf == NULL)
4452 goto out_ok;
4453 ret = -ERANGE;
4454 goto out_free;
4455 }
4456 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4457 if (buf) {
4458 if (res.acl_len > buflen) {
4459 ret = -ERANGE;
4460 goto out_free;
4461 }
4462 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4463 }
4464out_ok:
4465 ret = res.acl_len;
4466out_free:
4467 for (i = 0; i < npages; i++)
4468 if (pages[i])
4469 __free_page(pages[i]);
4470 if (res.acl_scratch)
4471 __free_page(res.acl_scratch);
4472 return ret;
4473}
4474
4475static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4476{
4477 struct nfs4_exception exception = { };
4478 ssize_t ret;
4479 do {
4480 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4481 trace_nfs4_get_acl(inode, ret);
4482 if (ret >= 0)
4483 break;
4484 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4485 } while (exception.retry);
4486 return ret;
4487}
4488
4489static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4490{
4491 struct nfs_server *server = NFS_SERVER(inode);
4492 int ret;
4493
4494 if (!nfs4_server_supports_acls(server))
4495 return -EOPNOTSUPP;
4496 ret = nfs_revalidate_inode(server, inode);
4497 if (ret < 0)
4498 return ret;
4499 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4500 nfs_zap_acl_cache(inode);
4501 ret = nfs4_read_cached_acl(inode, buf, buflen);
4502 if (ret != -ENOENT)
4503 /* -ENOENT is returned if there is no ACL or if there is an ACL
4504 * but no cached acl data, just the acl length */
4505 return ret;
4506 return nfs4_get_acl_uncached(inode, buf, buflen);
4507}
4508
4509static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4510{
4511 struct nfs_server *server = NFS_SERVER(inode);
4512 struct page *pages[NFS4ACL_MAXPAGES];
4513 struct nfs_setaclargs arg = {
4514 .fh = NFS_FH(inode),
4515 .acl_pages = pages,
4516 .acl_len = buflen,
4517 };
4518 struct nfs_setaclres res;
4519 struct rpc_message msg = {
4520 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4521 .rpc_argp = &arg,
4522 .rpc_resp = &res,
4523 };
4524 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4525 int ret, i;
4526
4527 if (!nfs4_server_supports_acls(server))
4528 return -EOPNOTSUPP;
4529 if (npages > ARRAY_SIZE(pages))
4530 return -ERANGE;
4531 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4532 if (i < 0)
4533 return i;
4534 nfs4_inode_return_delegation(inode);
4535 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4536
4537 /*
4538 * Free each page after tx, so the only ref left is
4539 * held by the network stack
4540 */
4541 for (; i > 0; i--)
4542 put_page(pages[i-1]);
4543
4544 /*
4545 * Acl update can result in inode attribute update.
4546 * so mark the attribute cache invalid.
4547 */
4548 spin_lock(&inode->i_lock);
4549 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4550 spin_unlock(&inode->i_lock);
4551 nfs_access_zap_cache(inode);
4552 nfs_zap_acl_cache(inode);
4553 return ret;
4554}
4555
4556static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4557{
4558 struct nfs4_exception exception = { };
4559 int err;
4560 do {
4561 err = __nfs4_proc_set_acl(inode, buf, buflen);
4562 trace_nfs4_set_acl(inode, err);
4563 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4564 &exception);
4565 } while (exception.retry);
4566 return err;
4567}
4568
4569#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4570static int _nfs4_get_security_label(struct inode *inode, void *buf,
4571 size_t buflen)
4572{
4573 struct nfs_server *server = NFS_SERVER(inode);
4574 struct nfs_fattr fattr;
4575 struct nfs4_label label = {0, 0, buflen, buf};
4576
4577 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4578 struct nfs4_getattr_arg args = {
4579 .fh = NFS_FH(inode),
4580 .bitmask = bitmask,
4581 };
4582 struct nfs4_getattr_res res = {
4583 .fattr = &fattr,
4584 .label = &label,
4585 .server = server,
4586 };
4587 struct rpc_message msg = {
4588 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4589 .rpc_argp = &args,
4590 .rpc_resp = &res,
4591 };
4592 int ret;
4593
4594 nfs_fattr_init(&fattr);
4595
4596 ret = rpc_call_sync(server->client, &msg, 0);
4597 if (ret)
4598 return ret;
4599 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4600 return -ENOENT;
4601 if (buflen < label.len)
4602 return -ERANGE;
4603 return 0;
4604}
4605
4606static int nfs4_get_security_label(struct inode *inode, void *buf,
4607 size_t buflen)
4608{
4609 struct nfs4_exception exception = { };
4610 int err;
4611
4612 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4613 return -EOPNOTSUPP;
4614
4615 do {
4616 err = _nfs4_get_security_label(inode, buf, buflen);
4617 trace_nfs4_get_security_label(inode, err);
4618 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4619 &exception);
4620 } while (exception.retry);
4621 return err;
4622}
4623
4624static int _nfs4_do_set_security_label(struct inode *inode,
4625 struct nfs4_label *ilabel,
4626 struct nfs_fattr *fattr,
4627 struct nfs4_label *olabel)
4628{
4629
4630 struct iattr sattr = {0};
4631 struct nfs_server *server = NFS_SERVER(inode);
4632 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4633 struct nfs_setattrargs args = {
4634 .fh = NFS_FH(inode),
4635 .iap = &sattr,
4636 .server = server,
4637 .bitmask = bitmask,
4638 .label = ilabel,
4639 };
4640 struct nfs_setattrres res = {
4641 .fattr = fattr,
4642 .label = olabel,
4643 .server = server,
4644 };
4645 struct rpc_message msg = {
4646 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4647 .rpc_argp = &args,
4648 .rpc_resp = &res,
4649 };
4650 int status;
4651
4652 nfs4_stateid_copy(&args.stateid, &zero_stateid);
4653
4654 status = rpc_call_sync(server->client, &msg, 0);
4655 if (status)
4656 dprintk("%s failed: %d\n", __func__, status);
4657
4658 return status;
4659}
4660
4661static int nfs4_do_set_security_label(struct inode *inode,
4662 struct nfs4_label *ilabel,
4663 struct nfs_fattr *fattr,
4664 struct nfs4_label *olabel)
4665{
4666 struct nfs4_exception exception = { };
4667 int err;
4668
4669 do {
4670 err = _nfs4_do_set_security_label(inode, ilabel,
4671 fattr, olabel);
4672 trace_nfs4_set_security_label(inode, err);
4673 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4674 &exception);
4675 } while (exception.retry);
4676 return err;
4677}
4678
4679static int
4680nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4681{
4682 struct nfs4_label ilabel, *olabel = NULL;
4683 struct nfs_fattr fattr;
4684 struct rpc_cred *cred;
4685 struct inode *inode = dentry->d_inode;
4686 int status;
4687
4688 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4689 return -EOPNOTSUPP;
4690
4691 nfs_fattr_init(&fattr);
4692
4693 ilabel.pi = 0;
4694 ilabel.lfs = 0;
4695 ilabel.label = (char *)buf;
4696 ilabel.len = buflen;
4697
4698 cred = rpc_lookup_cred();
4699 if (IS_ERR(cred))
4700 return PTR_ERR(cred);
4701
4702 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4703 if (IS_ERR(olabel)) {
4704 status = -PTR_ERR(olabel);
4705 goto out;
4706 }
4707
4708 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4709 if (status == 0)
4710 nfs_setsecurity(inode, &fattr, olabel);
4711
4712 nfs4_label_free(olabel);
4713out:
4714 put_rpccred(cred);
4715 return status;
4716}
4717#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4718
4719
4720static int
4721nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4722{
4723 struct nfs_client *clp = server->nfs_client;
4724
4725 if (task->tk_status >= 0)
4726 return 0;
4727 switch(task->tk_status) {
4728 case -NFS4ERR_DELEG_REVOKED:
4729 case -NFS4ERR_ADMIN_REVOKED:
4730 case -NFS4ERR_BAD_STATEID:
4731 if (state == NULL)
4732 break;
4733 nfs_remove_bad_delegation(state->inode);
4734 case -NFS4ERR_OPENMODE:
4735 if (state == NULL)
4736 break;
4737 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4738 goto stateid_invalid;
4739 goto wait_on_recovery;
4740 case -NFS4ERR_EXPIRED:
4741 if (state != NULL) {
4742 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4743 goto stateid_invalid;
4744 }
4745 case -NFS4ERR_STALE_STATEID:
4746 case -NFS4ERR_STALE_CLIENTID:
4747 nfs4_schedule_lease_recovery(clp);
4748 goto wait_on_recovery;
4749#if defined(CONFIG_NFS_V4_1)
4750 case -NFS4ERR_BADSESSION:
4751 case -NFS4ERR_BADSLOT:
4752 case -NFS4ERR_BAD_HIGH_SLOT:
4753 case -NFS4ERR_DEADSESSION:
4754 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4755 case -NFS4ERR_SEQ_FALSE_RETRY:
4756 case -NFS4ERR_SEQ_MISORDERED:
4757 dprintk("%s ERROR %d, Reset session\n", __func__,
4758 task->tk_status);
4759 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4760 task->tk_status = 0;
4761 return -EAGAIN;
4762#endif /* CONFIG_NFS_V4_1 */
4763 case -NFS4ERR_DELAY:
4764 nfs_inc_server_stats(server, NFSIOS_DELAY);
4765 case -NFS4ERR_GRACE:
4766 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4767 task->tk_status = 0;
4768 return -EAGAIN;
4769 case -NFS4ERR_RETRY_UNCACHED_REP:
4770 case -NFS4ERR_OLD_STATEID:
4771 task->tk_status = 0;
4772 return -EAGAIN;
4773 }
4774 task->tk_status = nfs4_map_errors(task->tk_status);
4775 return 0;
4776stateid_invalid:
4777 task->tk_status = -EIO;
4778 return 0;
4779wait_on_recovery:
4780 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4781 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4782 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4783 task->tk_status = 0;
4784 return -EAGAIN;
4785}
4786
4787static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4788 nfs4_verifier *bootverf)
4789{
4790 __be32 verf[2];
4791
4792 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4793 /* An impossible timestamp guarantees this value
4794 * will never match a generated boot time. */
4795 verf[0] = 0;
4796 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4797 } else {
4798 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4799 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4800 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4801 }
4802 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4803}
4804
4805static unsigned int
4806nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4807 char *buf, size_t len)
4808{
4809 unsigned int result;
4810
4811 rcu_read_lock();
4812 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4813 clp->cl_ipaddr,
4814 rpc_peeraddr2str(clp->cl_rpcclient,
4815 RPC_DISPLAY_ADDR),
4816 rpc_peeraddr2str(clp->cl_rpcclient,
4817 RPC_DISPLAY_PROTO));
4818 rcu_read_unlock();
4819 return result;
4820}
4821
4822static unsigned int
4823nfs4_init_uniform_client_string(const struct nfs_client *clp,
4824 char *buf, size_t len)
4825{
4826 const char *nodename = clp->cl_rpcclient->cl_nodename;
4827
4828 if (nfs4_client_id_uniquifier[0] != '\0')
4829 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4830 clp->rpc_ops->version,
4831 clp->cl_minorversion,
4832 nfs4_client_id_uniquifier,
4833 nodename);
4834 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4835 clp->rpc_ops->version, clp->cl_minorversion,
4836 nodename);
4837}
4838
4839/**
4840 * nfs4_proc_setclientid - Negotiate client ID
4841 * @clp: state data structure
4842 * @program: RPC program for NFSv4 callback service
4843 * @port: IP port number for NFS4 callback service
4844 * @cred: RPC credential to use for this call
4845 * @res: where to place the result
4846 *
4847 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4848 */
4849int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4850 unsigned short port, struct rpc_cred *cred,
4851 struct nfs4_setclientid_res *res)
4852{
4853 nfs4_verifier sc_verifier;
4854 struct nfs4_setclientid setclientid = {
4855 .sc_verifier = &sc_verifier,
4856 .sc_prog = program,
4857 .sc_cb_ident = clp->cl_cb_ident,
4858 };
4859 struct rpc_message msg = {
4860 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4861 .rpc_argp = &setclientid,
4862 .rpc_resp = res,
4863 .rpc_cred = cred,
4864 };
4865 int status;
4866
4867 /* nfs_client_id4 */
4868 nfs4_init_boot_verifier(clp, &sc_verifier);
4869 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4870 setclientid.sc_name_len =
4871 nfs4_init_uniform_client_string(clp,
4872 setclientid.sc_name,
4873 sizeof(setclientid.sc_name));
4874 else
4875 setclientid.sc_name_len =
4876 nfs4_init_nonuniform_client_string(clp,
4877 setclientid.sc_name,
4878 sizeof(setclientid.sc_name));
4879 /* cb_client4 */
4880 rcu_read_lock();
4881 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4882 sizeof(setclientid.sc_netid), "%s",
4883 rpc_peeraddr2str(clp->cl_rpcclient,
4884 RPC_DISPLAY_NETID));
4885 rcu_read_unlock();
4886 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4887 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4888 clp->cl_ipaddr, port >> 8, port & 255);
4889
4890 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
4891 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4892 setclientid.sc_name_len, setclientid.sc_name);
4893 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4894 trace_nfs4_setclientid(clp, status);
4895 dprintk("NFS reply setclientid: %d\n", status);
4896 return status;
4897}
4898
4899/**
4900 * nfs4_proc_setclientid_confirm - Confirm client ID
4901 * @clp: state data structure
4902 * @res: result of a previous SETCLIENTID
4903 * @cred: RPC credential to use for this call
4904 *
4905 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4906 */
4907int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4908 struct nfs4_setclientid_res *arg,
4909 struct rpc_cred *cred)
4910{
4911 struct rpc_message msg = {
4912 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4913 .rpc_argp = arg,
4914 .rpc_cred = cred,
4915 };
4916 int status;
4917
4918 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
4919 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4920 clp->cl_clientid);
4921 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4922 trace_nfs4_setclientid_confirm(clp, status);
4923 dprintk("NFS reply setclientid_confirm: %d\n", status);
4924 return status;
4925}
4926
4927struct nfs4_delegreturndata {
4928 struct nfs4_delegreturnargs args;
4929 struct nfs4_delegreturnres res;
4930 struct nfs_fh fh;
4931 nfs4_stateid stateid;
4932 unsigned long timestamp;
4933 struct nfs_fattr fattr;
4934 int rpc_status;
4935};
4936
4937static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4938{
4939 struct nfs4_delegreturndata *data = calldata;
4940
4941 if (!nfs4_sequence_done(task, &data->res.seq_res))
4942 return;
4943
4944 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4945 switch (task->tk_status) {
4946 case -NFS4ERR_STALE_STATEID:
4947 case -NFS4ERR_EXPIRED:
4948 case 0:
4949 renew_lease(data->res.server, data->timestamp);
4950 break;
4951 default:
4952 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4953 -EAGAIN) {
4954 rpc_restart_call_prepare(task);
4955 return;
4956 }
4957 }
4958 data->rpc_status = task->tk_status;
4959}
4960
4961static void nfs4_delegreturn_release(void *calldata)
4962{
4963 kfree(calldata);
4964}
4965
4966static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4967{
4968 struct nfs4_delegreturndata *d_data;
4969
4970 d_data = (struct nfs4_delegreturndata *)data;
4971
4972 nfs4_setup_sequence(d_data->res.server,
4973 &d_data->args.seq_args,
4974 &d_data->res.seq_res,
4975 task);
4976}
4977
4978static const struct rpc_call_ops nfs4_delegreturn_ops = {
4979 .rpc_call_prepare = nfs4_delegreturn_prepare,
4980 .rpc_call_done = nfs4_delegreturn_done,
4981 .rpc_release = nfs4_delegreturn_release,
4982};
4983
4984static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4985{
4986 struct nfs4_delegreturndata *data;
4987 struct nfs_server *server = NFS_SERVER(inode);
4988 struct rpc_task *task;
4989 struct rpc_message msg = {
4990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4991 .rpc_cred = cred,
4992 };
4993 struct rpc_task_setup task_setup_data = {
4994 .rpc_client = server->client,
4995 .rpc_message = &msg,
4996 .callback_ops = &nfs4_delegreturn_ops,
4997 .flags = RPC_TASK_ASYNC,
4998 };
4999 int status = 0;
5000
5001 data = kzalloc(sizeof(*data), GFP_NOFS);
5002 if (data == NULL)
5003 return -ENOMEM;
5004 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5005 data->args.fhandle = &data->fh;
5006 data->args.stateid = &data->stateid;
5007 data->args.bitmask = server->cache_consistency_bitmask;
5008 nfs_copy_fh(&data->fh, NFS_FH(inode));
5009 nfs4_stateid_copy(&data->stateid, stateid);
5010 data->res.fattr = &data->fattr;
5011 data->res.server = server;
5012 nfs_fattr_init(data->res.fattr);
5013 data->timestamp = jiffies;
5014 data->rpc_status = 0;
5015
5016 task_setup_data.callback_data = data;
5017 msg.rpc_argp = &data->args;
5018 msg.rpc_resp = &data->res;
5019 task = rpc_run_task(&task_setup_data);
5020 if (IS_ERR(task))
5021 return PTR_ERR(task);
5022 if (!issync)
5023 goto out;
5024 status = nfs4_wait_for_completion_rpc_task(task);
5025 if (status != 0)
5026 goto out;
5027 status = data->rpc_status;
5028 if (status == 0)
5029 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5030 else
5031 nfs_refresh_inode(inode, &data->fattr);
5032out:
5033 rpc_put_task(task);
5034 return status;
5035}
5036
5037int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5038{
5039 struct nfs_server *server = NFS_SERVER(inode);
5040 struct nfs4_exception exception = { };
5041 int err;
5042 do {
5043 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5044 trace_nfs4_delegreturn(inode, err);
5045 switch (err) {
5046 case -NFS4ERR_STALE_STATEID:
5047 case -NFS4ERR_EXPIRED:
5048 case 0:
5049 return 0;
5050 }
5051 err = nfs4_handle_exception(server, err, &exception);
5052 } while (exception.retry);
5053 return err;
5054}
5055
5056#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5057#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5058
5059/*
5060 * sleep, with exponential backoff, and retry the LOCK operation.
5061 */
5062static unsigned long
5063nfs4_set_lock_task_retry(unsigned long timeout)
5064{
5065 freezable_schedule_timeout_killable_unsafe(timeout);
5066 timeout <<= 1;
5067 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5068 return NFS4_LOCK_MAXTIMEOUT;
5069 return timeout;
5070}
5071
5072static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5073{
5074 struct inode *inode = state->inode;
5075 struct nfs_server *server = NFS_SERVER(inode);
5076 struct nfs_client *clp = server->nfs_client;
5077 struct nfs_lockt_args arg = {
5078 .fh = NFS_FH(inode),
5079 .fl = request,
5080 };
5081 struct nfs_lockt_res res = {
5082 .denied = request,
5083 };
5084 struct rpc_message msg = {
5085 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5086 .rpc_argp = &arg,
5087 .rpc_resp = &res,
5088 .rpc_cred = state->owner->so_cred,
5089 };
5090 struct nfs4_lock_state *lsp;
5091 int status;
5092
5093 arg.lock_owner.clientid = clp->cl_clientid;
5094 status = nfs4_set_lock_state(state, request);
5095 if (status != 0)
5096 goto out;
5097 lsp = request->fl_u.nfs4_fl.owner;
5098 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5099 arg.lock_owner.s_dev = server->s_dev;
5100 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5101 switch (status) {
5102 case 0:
5103 request->fl_type = F_UNLCK;
5104 break;
5105 case -NFS4ERR_DENIED:
5106 status = 0;
5107 }
5108 request->fl_ops->fl_release_private(request);
5109out:
5110 return status;
5111}
5112
5113static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5114{
5115 struct nfs4_exception exception = { };
5116 int err;
5117
5118 do {
5119 err = _nfs4_proc_getlk(state, cmd, request);
5120 trace_nfs4_get_lock(request, state, cmd, err);
5121 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5122 &exception);
5123 } while (exception.retry);
5124 return err;
5125}
5126
5127static int do_vfs_lock(struct file *file, struct file_lock *fl)
5128{
5129 int res = 0;
5130 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5131 case FL_POSIX:
5132 res = posix_lock_file_wait(file, fl);
5133 break;
5134 case FL_FLOCK:
5135 res = flock_lock_file_wait(file, fl);
5136 break;
5137 default:
5138 BUG();
5139 }
5140 return res;
5141}
5142
5143struct nfs4_unlockdata {
5144 struct nfs_locku_args arg;
5145 struct nfs_locku_res res;
5146 struct nfs4_lock_state *lsp;
5147 struct nfs_open_context *ctx;
5148 struct file_lock fl;
5149 const struct nfs_server *server;
5150 unsigned long timestamp;
5151};
5152
5153static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5154 struct nfs_open_context *ctx,
5155 struct nfs4_lock_state *lsp,
5156 struct nfs_seqid *seqid)
5157{
5158 struct nfs4_unlockdata *p;
5159 struct inode *inode = lsp->ls_state->inode;
5160
5161 p = kzalloc(sizeof(*p), GFP_NOFS);
5162 if (p == NULL)
5163 return NULL;
5164 p->arg.fh = NFS_FH(inode);
5165 p->arg.fl = &p->fl;
5166 p->arg.seqid = seqid;
5167 p->res.seqid = seqid;
5168 p->arg.stateid = &lsp->ls_stateid;
5169 p->lsp = lsp;
5170 atomic_inc(&lsp->ls_count);
5171 /* Ensure we don't close file until we're done freeing locks! */
5172 p->ctx = get_nfs_open_context(ctx);
5173 memcpy(&p->fl, fl, sizeof(p->fl));
5174 p->server = NFS_SERVER(inode);
5175 return p;
5176}
5177
5178static void nfs4_locku_release_calldata(void *data)
5179{
5180 struct nfs4_unlockdata *calldata = data;
5181 nfs_free_seqid(calldata->arg.seqid);
5182 nfs4_put_lock_state(calldata->lsp);
5183 put_nfs_open_context(calldata->ctx);
5184 kfree(calldata);
5185}
5186
5187static void nfs4_locku_done(struct rpc_task *task, void *data)
5188{
5189 struct nfs4_unlockdata *calldata = data;
5190
5191 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5192 return;
5193 switch (task->tk_status) {
5194 case 0:
5195 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5196 &calldata->res.stateid);
5197 renew_lease(calldata->server, calldata->timestamp);
5198 break;
5199 case -NFS4ERR_BAD_STATEID:
5200 case -NFS4ERR_OLD_STATEID:
5201 case -NFS4ERR_STALE_STATEID:
5202 case -NFS4ERR_EXPIRED:
5203 break;
5204 default:
5205 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5206 rpc_restart_call_prepare(task);
5207 }
5208 nfs_release_seqid(calldata->arg.seqid);
5209}
5210
5211static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5212{
5213 struct nfs4_unlockdata *calldata = data;
5214
5215 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5216 goto out_wait;
5217 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5218 /* Note: exit _without_ running nfs4_locku_done */
5219 goto out_no_action;
5220 }
5221 calldata->timestamp = jiffies;
5222 if (nfs4_setup_sequence(calldata->server,
5223 &calldata->arg.seq_args,
5224 &calldata->res.seq_res,
5225 task) != 0)
5226 nfs_release_seqid(calldata->arg.seqid);
5227 return;
5228out_no_action:
5229 task->tk_action = NULL;
5230out_wait:
5231 nfs4_sequence_done(task, &calldata->res.seq_res);
5232}
5233
5234static const struct rpc_call_ops nfs4_locku_ops = {
5235 .rpc_call_prepare = nfs4_locku_prepare,
5236 .rpc_call_done = nfs4_locku_done,
5237 .rpc_release = nfs4_locku_release_calldata,
5238};
5239
5240static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5241 struct nfs_open_context *ctx,
5242 struct nfs4_lock_state *lsp,
5243 struct nfs_seqid *seqid)
5244{
5245 struct nfs4_unlockdata *data;
5246 struct rpc_message msg = {
5247 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5248 .rpc_cred = ctx->cred,
5249 };
5250 struct rpc_task_setup task_setup_data = {
5251 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5252 .rpc_message = &msg,
5253 .callback_ops = &nfs4_locku_ops,
5254 .workqueue = nfsiod_workqueue,
5255 .flags = RPC_TASK_ASYNC,
5256 };
5257
5258 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5259 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5260
5261 /* Ensure this is an unlock - when canceling a lock, the
5262 * canceled lock is passed in, and it won't be an unlock.
5263 */
5264 fl->fl_type = F_UNLCK;
5265
5266 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5267 if (data == NULL) {
5268 nfs_free_seqid(seqid);
5269 return ERR_PTR(-ENOMEM);
5270 }
5271
5272 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5273 msg.rpc_argp = &data->arg;
5274 msg.rpc_resp = &data->res;
5275 task_setup_data.callback_data = data;
5276 return rpc_run_task(&task_setup_data);
5277}
5278
5279static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5280{
5281 struct inode *inode = state->inode;
5282 struct nfs4_state_owner *sp = state->owner;
5283 struct nfs_inode *nfsi = NFS_I(inode);
5284 struct nfs_seqid *seqid;
5285 struct nfs4_lock_state *lsp;
5286 struct rpc_task *task;
5287 int status = 0;
5288 unsigned char fl_flags = request->fl_flags;
5289
5290 status = nfs4_set_lock_state(state, request);
5291 /* Unlock _before_ we do the RPC call */
5292 request->fl_flags |= FL_EXISTS;
5293 /* Exclude nfs_delegation_claim_locks() */
5294 mutex_lock(&sp->so_delegreturn_mutex);
5295 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5296 down_read(&nfsi->rwsem);
5297 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5298 up_read(&nfsi->rwsem);
5299 mutex_unlock(&sp->so_delegreturn_mutex);
5300 goto out;
5301 }
5302 up_read(&nfsi->rwsem);
5303 mutex_unlock(&sp->so_delegreturn_mutex);
5304 if (status != 0)
5305 goto out;
5306 /* Is this a delegated lock? */
5307 lsp = request->fl_u.nfs4_fl.owner;
5308 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5309 goto out;
5310 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5311 status = -ENOMEM;
5312 if (seqid == NULL)
5313 goto out;
5314 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5315 status = PTR_ERR(task);
5316 if (IS_ERR(task))
5317 goto out;
5318 status = nfs4_wait_for_completion_rpc_task(task);
5319 rpc_put_task(task);
5320out:
5321 request->fl_flags = fl_flags;
5322 trace_nfs4_unlock(request, state, F_SETLK, status);
5323 return status;
5324}
5325
5326struct nfs4_lockdata {
5327 struct nfs_lock_args arg;
5328 struct nfs_lock_res res;
5329 struct nfs4_lock_state *lsp;
5330 struct nfs_open_context *ctx;
5331 struct file_lock fl;
5332 unsigned long timestamp;
5333 int rpc_status;
5334 int cancelled;
5335 struct nfs_server *server;
5336};
5337
5338static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5339 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5340 gfp_t gfp_mask)
5341{
5342 struct nfs4_lockdata *p;
5343 struct inode *inode = lsp->ls_state->inode;
5344 struct nfs_server *server = NFS_SERVER(inode);
5345
5346 p = kzalloc(sizeof(*p), gfp_mask);
5347 if (p == NULL)
5348 return NULL;
5349
5350 p->arg.fh = NFS_FH(inode);
5351 p->arg.fl = &p->fl;
5352 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5353 if (p->arg.open_seqid == NULL)
5354 goto out_free;
5355 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5356 if (p->arg.lock_seqid == NULL)
5357 goto out_free_seqid;
5358 p->arg.lock_stateid = &lsp->ls_stateid;
5359 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5360 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5361 p->arg.lock_owner.s_dev = server->s_dev;
5362 p->res.lock_seqid = p->arg.lock_seqid;
5363 p->lsp = lsp;
5364 p->server = server;
5365 atomic_inc(&lsp->ls_count);
5366 p->ctx = get_nfs_open_context(ctx);
5367 memcpy(&p->fl, fl, sizeof(p->fl));
5368 return p;
5369out_free_seqid:
5370 nfs_free_seqid(p->arg.open_seqid);
5371out_free:
5372 kfree(p);
5373 return NULL;
5374}
5375
5376static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5377{
5378 struct nfs4_lockdata *data = calldata;
5379 struct nfs4_state *state = data->lsp->ls_state;
5380
5381 dprintk("%s: begin!\n", __func__);
5382 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5383 goto out_wait;
5384 /* Do we need to do an open_to_lock_owner? */
5385 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5386 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5387 goto out_release_lock_seqid;
5388 }
5389 data->arg.open_stateid = &state->open_stateid;
5390 data->arg.new_lock_owner = 1;
5391 data->res.open_seqid = data->arg.open_seqid;
5392 } else
5393 data->arg.new_lock_owner = 0;
5394 if (!nfs4_valid_open_stateid(state)) {
5395 data->rpc_status = -EBADF;
5396 task->tk_action = NULL;
5397 goto out_release_open_seqid;
5398 }
5399 data->timestamp = jiffies;
5400 if (nfs4_setup_sequence(data->server,
5401 &data->arg.seq_args,
5402 &data->res.seq_res,
5403 task) == 0)
5404 return;
5405out_release_open_seqid:
5406 nfs_release_seqid(data->arg.open_seqid);
5407out_release_lock_seqid:
5408 nfs_release_seqid(data->arg.lock_seqid);
5409out_wait:
5410 nfs4_sequence_done(task, &data->res.seq_res);
5411 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5412}
5413
5414static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5415{
5416 struct nfs4_lockdata *data = calldata;
5417
5418 dprintk("%s: begin!\n", __func__);
5419
5420 if (!nfs4_sequence_done(task, &data->res.seq_res))
5421 return;
5422
5423 data->rpc_status = task->tk_status;
5424 if (data->arg.new_lock_owner != 0) {
5425 if (data->rpc_status == 0)
5426 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5427 else
5428 goto out;
5429 }
5430 if (data->rpc_status == 0) {
5431 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5432 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5433 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5434 }
5435out:
5436 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5437}
5438
5439static void nfs4_lock_release(void *calldata)
5440{
5441 struct nfs4_lockdata *data = calldata;
5442
5443 dprintk("%s: begin!\n", __func__);
5444 nfs_free_seqid(data->arg.open_seqid);
5445 if (data->cancelled != 0) {
5446 struct rpc_task *task;
5447 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5448 data->arg.lock_seqid);
5449 if (!IS_ERR(task))
5450 rpc_put_task_async(task);
5451 dprintk("%s: cancelling lock!\n", __func__);
5452 } else
5453 nfs_free_seqid(data->arg.lock_seqid);
5454 nfs4_put_lock_state(data->lsp);
5455 put_nfs_open_context(data->ctx);
5456 kfree(data);
5457 dprintk("%s: done!\n", __func__);
5458}
5459
5460static const struct rpc_call_ops nfs4_lock_ops = {
5461 .rpc_call_prepare = nfs4_lock_prepare,
5462 .rpc_call_done = nfs4_lock_done,
5463 .rpc_release = nfs4_lock_release,
5464};
5465
5466static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5467{
5468 switch (error) {
5469 case -NFS4ERR_ADMIN_REVOKED:
5470 case -NFS4ERR_BAD_STATEID:
5471 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5472 if (new_lock_owner != 0 ||
5473 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5474 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5475 break;
5476 case -NFS4ERR_STALE_STATEID:
5477 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5478 case -NFS4ERR_EXPIRED:
5479 nfs4_schedule_lease_recovery(server->nfs_client);
5480 };
5481}
5482
5483static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5484{
5485 struct nfs4_lockdata *data;
5486 struct rpc_task *task;
5487 struct rpc_message msg = {
5488 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5489 .rpc_cred = state->owner->so_cred,
5490 };
5491 struct rpc_task_setup task_setup_data = {
5492 .rpc_client = NFS_CLIENT(state->inode),
5493 .rpc_message = &msg,
5494 .callback_ops = &nfs4_lock_ops,
5495 .workqueue = nfsiod_workqueue,
5496 .flags = RPC_TASK_ASYNC,
5497 };
5498 int ret;
5499
5500 dprintk("%s: begin!\n", __func__);
5501 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5502 fl->fl_u.nfs4_fl.owner,
5503 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5504 if (data == NULL)
5505 return -ENOMEM;
5506 if (IS_SETLKW(cmd))
5507 data->arg.block = 1;
5508 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5509 msg.rpc_argp = &data->arg;
5510 msg.rpc_resp = &data->res;
5511 task_setup_data.callback_data = data;
5512 if (recovery_type > NFS_LOCK_NEW) {
5513 if (recovery_type == NFS_LOCK_RECLAIM)
5514 data->arg.reclaim = NFS_LOCK_RECLAIM;
5515 nfs4_set_sequence_privileged(&data->arg.seq_args);
5516 }
5517 task = rpc_run_task(&task_setup_data);
5518 if (IS_ERR(task))
5519 return PTR_ERR(task);
5520 ret = nfs4_wait_for_completion_rpc_task(task);
5521 if (ret == 0) {
5522 ret = data->rpc_status;
5523 if (ret)
5524 nfs4_handle_setlk_error(data->server, data->lsp,
5525 data->arg.new_lock_owner, ret);
5526 } else
5527 data->cancelled = 1;
5528 rpc_put_task(task);
5529 dprintk("%s: done, ret = %d!\n", __func__, ret);
5530 return ret;
5531}
5532
5533static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5534{
5535 struct nfs_server *server = NFS_SERVER(state->inode);
5536 struct nfs4_exception exception = {
5537 .inode = state->inode,
5538 };
5539 int err;
5540
5541 do {
5542 /* Cache the lock if possible... */
5543 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5544 return 0;
5545 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5546 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5547 if (err != -NFS4ERR_DELAY)
5548 break;
5549 nfs4_handle_exception(server, err, &exception);
5550 } while (exception.retry);
5551 return err;
5552}
5553
5554static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5555{
5556 struct nfs_server *server = NFS_SERVER(state->inode);
5557 struct nfs4_exception exception = {
5558 .inode = state->inode,
5559 };
5560 int err;
5561
5562 err = nfs4_set_lock_state(state, request);
5563 if (err != 0)
5564 return err;
5565 if (!recover_lost_locks) {
5566 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5567 return 0;
5568 }
5569 do {
5570 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5571 return 0;
5572 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5573 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5574 switch (err) {
5575 default:
5576 goto out;
5577 case -NFS4ERR_GRACE:
5578 case -NFS4ERR_DELAY:
5579 nfs4_handle_exception(server, err, &exception);
5580 err = 0;
5581 }
5582 } while (exception.retry);
5583out:
5584 return err;
5585}
5586
5587#if defined(CONFIG_NFS_V4_1)
5588/**
5589 * nfs41_check_expired_locks - possibly free a lock stateid
5590 *
5591 * @state: NFSv4 state for an inode
5592 *
5593 * Returns NFS_OK if recovery for this stateid is now finished.
5594 * Otherwise a negative NFS4ERR value is returned.
5595 */
5596static int nfs41_check_expired_locks(struct nfs4_state *state)
5597{
5598 int status, ret = -NFS4ERR_BAD_STATEID;
5599 struct nfs4_lock_state *lsp;
5600 struct nfs_server *server = NFS_SERVER(state->inode);
5601
5602 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5603 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5604 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5605
5606 status = nfs41_test_stateid(server,
5607 &lsp->ls_stateid,
5608 cred);
5609 trace_nfs4_test_lock_stateid(state, lsp, status);
5610 if (status != NFS_OK) {
5611 /* Free the stateid unless the server
5612 * informs us the stateid is unrecognized. */
5613 if (status != -NFS4ERR_BAD_STATEID)
5614 nfs41_free_stateid(server,
5615 &lsp->ls_stateid,
5616 cred);
5617 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5618 ret = status;
5619 }
5620 }
5621 };
5622
5623 return ret;
5624}
5625
5626static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5627{
5628 int status = NFS_OK;
5629
5630 if (test_bit(LK_STATE_IN_USE, &state->flags))
5631 status = nfs41_check_expired_locks(state);
5632 if (status != NFS_OK)
5633 status = nfs4_lock_expired(state, request);
5634 return status;
5635}
5636#endif
5637
5638static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5639{
5640 struct nfs4_state_owner *sp = state->owner;
5641 struct nfs_inode *nfsi = NFS_I(state->inode);
5642 unsigned char fl_flags = request->fl_flags;
5643 unsigned int seq;
5644 int status = -ENOLCK;
5645
5646 if ((fl_flags & FL_POSIX) &&
5647 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5648 goto out;
5649 /* Is this a delegated open? */
5650 status = nfs4_set_lock_state(state, request);
5651 if (status != 0)
5652 goto out;
5653 request->fl_flags |= FL_ACCESS;
5654 status = do_vfs_lock(request->fl_file, request);
5655 if (status < 0)
5656 goto out;
5657 down_read(&nfsi->rwsem);
5658 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5659 /* Yes: cache locks! */
5660 /* ...but avoid races with delegation recall... */
5661 request->fl_flags = fl_flags & ~FL_SLEEP;
5662 status = do_vfs_lock(request->fl_file, request);
5663 goto out_unlock;
5664 }
5665 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5666 up_read(&nfsi->rwsem);
5667 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5668 if (status != 0)
5669 goto out;
5670 down_read(&nfsi->rwsem);
5671 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5672 status = -NFS4ERR_DELAY;
5673 goto out_unlock;
5674 }
5675 /* Note: we always want to sleep here! */
5676 request->fl_flags = fl_flags | FL_SLEEP;
5677 if (do_vfs_lock(request->fl_file, request) < 0)
5678 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5679 "manager!\n", __func__);
5680out_unlock:
5681 up_read(&nfsi->rwsem);
5682out:
5683 request->fl_flags = fl_flags;
5684 return status;
5685}
5686
5687static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5688{
5689 struct nfs4_exception exception = {
5690 .state = state,
5691 .inode = state->inode,
5692 };
5693 int err;
5694
5695 do {
5696 err = _nfs4_proc_setlk(state, cmd, request);
5697 trace_nfs4_set_lock(request, state, cmd, err);
5698 if (err == -NFS4ERR_DENIED)
5699 err = -EAGAIN;
5700 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5701 err, &exception);
5702 } while (exception.retry);
5703 return err;
5704}
5705
5706static int
5707nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5708{
5709 struct nfs_open_context *ctx;
5710 struct nfs4_state *state;
5711 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5712 int status;
5713
5714 /* verify open state */
5715 ctx = nfs_file_open_context(filp);
5716 state = ctx->state;
5717
5718 if (request->fl_start < 0 || request->fl_end < 0)
5719 return -EINVAL;
5720
5721 if (IS_GETLK(cmd)) {
5722 if (state != NULL)
5723 return nfs4_proc_getlk(state, F_GETLK, request);
5724 return 0;
5725 }
5726
5727 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5728 return -EINVAL;
5729
5730 if (request->fl_type == F_UNLCK) {
5731 if (state != NULL)
5732 return nfs4_proc_unlck(state, cmd, request);
5733 return 0;
5734 }
5735
5736 if (state == NULL)
5737 return -ENOLCK;
5738 /*
5739 * Don't rely on the VFS having checked the file open mode,
5740 * since it won't do this for flock() locks.
5741 */
5742 switch (request->fl_type) {
5743 case F_RDLCK:
5744 if (!(filp->f_mode & FMODE_READ))
5745 return -EBADF;
5746 break;
5747 case F_WRLCK:
5748 if (!(filp->f_mode & FMODE_WRITE))
5749 return -EBADF;
5750 }
5751
5752 do {
5753 status = nfs4_proc_setlk(state, cmd, request);
5754 if ((status != -EAGAIN) || IS_SETLK(cmd))
5755 break;
5756 timeout = nfs4_set_lock_task_retry(timeout);
5757 status = -ERESTARTSYS;
5758 if (signalled())
5759 break;
5760 } while(status < 0);
5761 return status;
5762}
5763
5764int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5765{
5766 struct nfs_server *server = NFS_SERVER(state->inode);
5767 int err;
5768
5769 err = nfs4_set_lock_state(state, fl);
5770 if (err != 0)
5771 return err;
5772 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5773 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5774}
5775
5776struct nfs_release_lockowner_data {
5777 struct nfs4_lock_state *lsp;
5778 struct nfs_server *server;
5779 struct nfs_release_lockowner_args args;
5780 struct nfs4_sequence_args seq_args;
5781 struct nfs4_sequence_res seq_res;
5782};
5783
5784static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5785{
5786 struct nfs_release_lockowner_data *data = calldata;
5787 nfs40_setup_sequence(data->server,
5788 &data->seq_args, &data->seq_res, task);
5789}
5790
5791static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5792{
5793 struct nfs_release_lockowner_data *data = calldata;
5794 nfs40_sequence_done(task, &data->seq_res);
5795}
5796
5797static void nfs4_release_lockowner_release(void *calldata)
5798{
5799 struct nfs_release_lockowner_data *data = calldata;
5800 nfs4_free_lock_state(data->server, data->lsp);
5801 kfree(calldata);
5802}
5803
5804static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5805 .rpc_call_prepare = nfs4_release_lockowner_prepare,
5806 .rpc_call_done = nfs4_release_lockowner_done,
5807 .rpc_release = nfs4_release_lockowner_release,
5808};
5809
5810static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5811{
5812 struct nfs_release_lockowner_data *data;
5813 struct rpc_message msg = {
5814 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5815 };
5816
5817 if (server->nfs_client->cl_mvops->minor_version != 0)
5818 return -EINVAL;
5819
5820 data = kmalloc(sizeof(*data), GFP_NOFS);
5821 if (!data)
5822 return -ENOMEM;
5823 nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5824 data->lsp = lsp;
5825 data->server = server;
5826 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5827 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5828 data->args.lock_owner.s_dev = server->s_dev;
5829
5830 msg.rpc_argp = &data->args;
5831 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5832 return 0;
5833}
5834
5835#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5836
5837static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5838 const void *buf, size_t buflen,
5839 int flags, int type)
5840{
5841 if (strcmp(key, "") != 0)
5842 return -EINVAL;
5843
5844 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5845}
5846
5847static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5848 void *buf, size_t buflen, int type)
5849{
5850 if (strcmp(key, "") != 0)
5851 return -EINVAL;
5852
5853 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5854}
5855
5856static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5857 size_t list_len, const char *name,
5858 size_t name_len, int type)
5859{
5860 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5861
5862 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5863 return 0;
5864
5865 if (list && len <= list_len)
5866 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5867 return len;
5868}
5869
5870#ifdef CONFIG_NFS_V4_SECURITY_LABEL
5871static inline int nfs4_server_supports_labels(struct nfs_server *server)
5872{
5873 return server->caps & NFS_CAP_SECURITY_LABEL;
5874}
5875
5876static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5877 const void *buf, size_t buflen,
5878 int flags, int type)
5879{
5880 if (security_ismaclabel(key))
5881 return nfs4_set_security_label(dentry, buf, buflen);
5882
5883 return -EOPNOTSUPP;
5884}
5885
5886static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5887 void *buf, size_t buflen, int type)
5888{
5889 if (security_ismaclabel(key))
5890 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5891 return -EOPNOTSUPP;
5892}
5893
5894static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5895 size_t list_len, const char *name,
5896 size_t name_len, int type)
5897{
5898 size_t len = 0;
5899
5900 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5901 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5902 if (list && len <= list_len)
5903 security_inode_listsecurity(dentry->d_inode, list, len);
5904 }
5905 return len;
5906}
5907
5908static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5909 .prefix = XATTR_SECURITY_PREFIX,
5910 .list = nfs4_xattr_list_nfs4_label,
5911 .get = nfs4_xattr_get_nfs4_label,
5912 .set = nfs4_xattr_set_nfs4_label,
5913};
5914#endif
5915
5916
5917/*
5918 * nfs_fhget will use either the mounted_on_fileid or the fileid
5919 */
5920static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5921{
5922 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5923 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5924 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5925 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5926 return;
5927
5928 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5929 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5930 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5931 fattr->nlink = 2;
5932}
5933
5934static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5935 const struct qstr *name,
5936 struct nfs4_fs_locations *fs_locations,
5937 struct page *page)
5938{
5939 struct nfs_server *server = NFS_SERVER(dir);
5940 u32 bitmask[3] = {
5941 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5942 };
5943 struct nfs4_fs_locations_arg args = {
5944 .dir_fh = NFS_FH(dir),
5945 .name = name,
5946 .page = page,
5947 .bitmask = bitmask,
5948 };
5949 struct nfs4_fs_locations_res res = {
5950 .fs_locations = fs_locations,
5951 };
5952 struct rpc_message msg = {
5953 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5954 .rpc_argp = &args,
5955 .rpc_resp = &res,
5956 };
5957 int status;
5958
5959 dprintk("%s: start\n", __func__);
5960
5961 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5962 * is not supported */
5963 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5964 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5965 else
5966 bitmask[0] |= FATTR4_WORD0_FILEID;
5967
5968 nfs_fattr_init(&fs_locations->fattr);
5969 fs_locations->server = server;
5970 fs_locations->nlocations = 0;
5971 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5972 dprintk("%s: returned status = %d\n", __func__, status);
5973 return status;
5974}
5975
5976int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5977 const struct qstr *name,
5978 struct nfs4_fs_locations *fs_locations,
5979 struct page *page)
5980{
5981 struct nfs4_exception exception = { };
5982 int err;
5983 do {
5984 err = _nfs4_proc_fs_locations(client, dir, name,
5985 fs_locations, page);
5986 trace_nfs4_get_fs_locations(dir, name, err);
5987 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5988 &exception);
5989 } while (exception.retry);
5990 return err;
5991}
5992
5993/**
5994 * If 'use_integrity' is true and the state managment nfs_client
5995 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
5996 * and the machine credential as per RFC3530bis and RFC5661 Security
5997 * Considerations sections. Otherwise, just use the user cred with the
5998 * filesystem's rpc_client.
5999 */
6000static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6001{
6002 int status;
6003 struct nfs4_secinfo_arg args = {
6004 .dir_fh = NFS_FH(dir),
6005 .name = name,
6006 };
6007 struct nfs4_secinfo_res res = {
6008 .flavors = flavors,
6009 };
6010 struct rpc_message msg = {
6011 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6012 .rpc_argp = &args,
6013 .rpc_resp = &res,
6014 };
6015 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6016 struct rpc_cred *cred = NULL;
6017
6018 if (use_integrity) {
6019 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6020 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6021 msg.rpc_cred = cred;
6022 }
6023
6024 dprintk("NFS call secinfo %s\n", name->name);
6025
6026 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6027 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6028
6029 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6030 &res.seq_res, 0);
6031 dprintk("NFS reply secinfo: %d\n", status);
6032
6033 if (cred)
6034 put_rpccred(cred);
6035
6036 return status;
6037}
6038
6039int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6040 struct nfs4_secinfo_flavors *flavors)
6041{
6042 struct nfs4_exception exception = { };
6043 int err;
6044 do {
6045 err = -NFS4ERR_WRONGSEC;
6046
6047 /* try to use integrity protection with machine cred */
6048 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6049 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6050
6051 /*
6052 * if unable to use integrity protection, or SECINFO with
6053 * integrity protection returns NFS4ERR_WRONGSEC (which is
6054 * disallowed by spec, but exists in deployed servers) use
6055 * the current filesystem's rpc_client and the user cred.
6056 */
6057 if (err == -NFS4ERR_WRONGSEC)
6058 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6059
6060 trace_nfs4_secinfo(dir, name, err);
6061 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6062 &exception);
6063 } while (exception.retry);
6064 return err;
6065}
6066
6067#ifdef CONFIG_NFS_V4_1
6068/*
6069 * Check the exchange flags returned by the server for invalid flags, having
6070 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6071 * DS flags set.
6072 */
6073static int nfs4_check_cl_exchange_flags(u32 flags)
6074{
6075 if (flags & ~EXCHGID4_FLAG_MASK_R)
6076 goto out_inval;
6077 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6078 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6079 goto out_inval;
6080 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6081 goto out_inval;
6082 return NFS_OK;
6083out_inval:
6084 return -NFS4ERR_INVAL;
6085}
6086
6087static bool
6088nfs41_same_server_scope(struct nfs41_server_scope *a,
6089 struct nfs41_server_scope *b)
6090{
6091 if (a->server_scope_sz == b->server_scope_sz &&
6092 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6093 return true;
6094
6095 return false;
6096}
6097
6098/*
6099 * nfs4_proc_bind_conn_to_session()
6100 *
6101 * The 4.1 client currently uses the same TCP connection for the
6102 * fore and backchannel.
6103 */
6104int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6105{
6106 int status;
6107 struct nfs41_bind_conn_to_session_res res;
6108 struct rpc_message msg = {
6109 .rpc_proc =
6110 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6111 .rpc_argp = clp,
6112 .rpc_resp = &res,
6113 .rpc_cred = cred,
6114 };
6115
6116 dprintk("--> %s\n", __func__);
6117
6118 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6119 if (unlikely(res.session == NULL)) {
6120 status = -ENOMEM;
6121 goto out;
6122 }
6123
6124 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6125 trace_nfs4_bind_conn_to_session(clp, status);
6126 if (status == 0) {
6127 if (memcmp(res.session->sess_id.data,
6128 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6129 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6130 status = -EIO;
6131 goto out_session;
6132 }
6133 if (res.dir != NFS4_CDFS4_BOTH) {
6134 dprintk("NFS: %s: Unexpected direction from server\n",
6135 __func__);
6136 status = -EIO;
6137 goto out_session;
6138 }
6139 if (res.use_conn_in_rdma_mode) {
6140 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6141 __func__);
6142 status = -EIO;
6143 goto out_session;
6144 }
6145 }
6146out_session:
6147 kfree(res.session);
6148out:
6149 dprintk("<-- %s status= %d\n", __func__, status);
6150 return status;
6151}
6152
6153/*
6154 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6155 * and operations we'd like to see to enable certain features in the allow map
6156 */
6157static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6158 .how = SP4_MACH_CRED,
6159 .enforce.u.words = {
6160 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6161 1 << (OP_EXCHANGE_ID - 32) |
6162 1 << (OP_CREATE_SESSION - 32) |
6163 1 << (OP_DESTROY_SESSION - 32) |
6164 1 << (OP_DESTROY_CLIENTID - 32)
6165 },
6166 .allow.u.words = {
6167 [0] = 1 << (OP_CLOSE) |
6168 1 << (OP_LOCKU) |
6169 1 << (OP_COMMIT),
6170 [1] = 1 << (OP_SECINFO - 32) |
6171 1 << (OP_SECINFO_NO_NAME - 32) |
6172 1 << (OP_TEST_STATEID - 32) |
6173 1 << (OP_FREE_STATEID - 32) |
6174 1 << (OP_WRITE - 32)
6175 }
6176};
6177
6178/*
6179 * Select the state protection mode for client `clp' given the server results
6180 * from exchange_id in `sp'.
6181 *
6182 * Returns 0 on success, negative errno otherwise.
6183 */
6184static int nfs4_sp4_select_mode(struct nfs_client *clp,
6185 struct nfs41_state_protection *sp)
6186{
6187 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6188 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6189 1 << (OP_EXCHANGE_ID - 32) |
6190 1 << (OP_CREATE_SESSION - 32) |
6191 1 << (OP_DESTROY_SESSION - 32) |
6192 1 << (OP_DESTROY_CLIENTID - 32)
6193 };
6194 unsigned int i;
6195
6196 if (sp->how == SP4_MACH_CRED) {
6197 /* Print state protect result */
6198 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6199 for (i = 0; i <= LAST_NFS4_OP; i++) {
6200 if (test_bit(i, sp->enforce.u.longs))
6201 dfprintk(MOUNT, " enforce op %d\n", i);
6202 if (test_bit(i, sp->allow.u.longs))
6203 dfprintk(MOUNT, " allow op %d\n", i);
6204 }
6205
6206 /* make sure nothing is on enforce list that isn't supported */
6207 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6208 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6209 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6210 return -EINVAL;
6211 }
6212 }
6213
6214 /*
6215 * Minimal mode - state operations are allowed to use machine
6216 * credential. Note this already happens by default, so the
6217 * client doesn't have to do anything more than the negotiation.
6218 *
6219 * NOTE: we don't care if EXCHANGE_ID is in the list -
6220 * we're already using the machine cred for exchange_id
6221 * and will never use a different cred.
6222 */
6223 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6224 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6225 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6226 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6227 dfprintk(MOUNT, "sp4_mach_cred:\n");
6228 dfprintk(MOUNT, " minimal mode enabled\n");
6229 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6230 } else {
6231 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6232 return -EINVAL;
6233 }
6234
6235 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6236 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6237 dfprintk(MOUNT, " cleanup mode enabled\n");
6238 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6239 }
6240
6241 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6242 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6243 dfprintk(MOUNT, " secinfo mode enabled\n");
6244 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6245 }
6246
6247 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6248 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6249 dfprintk(MOUNT, " stateid mode enabled\n");
6250 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6251 }
6252
6253 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6254 dfprintk(MOUNT, " write mode enabled\n");
6255 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6256 }
6257
6258 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6259 dfprintk(MOUNT, " commit mode enabled\n");
6260 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6261 }
6262 }
6263
6264 return 0;
6265}
6266
6267/*
6268 * _nfs4_proc_exchange_id()
6269 *
6270 * Wrapper for EXCHANGE_ID operation.
6271 */
6272static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6273 u32 sp4_how)
6274{
6275 nfs4_verifier verifier;
6276 struct nfs41_exchange_id_args args = {
6277 .verifier = &verifier,
6278 .client = clp,
6279 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6280 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6281 };
6282 struct nfs41_exchange_id_res res = {
6283 0
6284 };
6285 int status;
6286 struct rpc_message msg = {
6287 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6288 .rpc_argp = &args,
6289 .rpc_resp = &res,
6290 .rpc_cred = cred,
6291 };
6292
6293 nfs4_init_boot_verifier(clp, &verifier);
6294 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6295 sizeof(args.id));
6296 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6297 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6298 args.id_len, args.id);
6299
6300 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6301 GFP_NOFS);
6302 if (unlikely(res.server_owner == NULL)) {
6303 status = -ENOMEM;
6304 goto out;
6305 }
6306
6307 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6308 GFP_NOFS);
6309 if (unlikely(res.server_scope == NULL)) {
6310 status = -ENOMEM;
6311 goto out_server_owner;
6312 }
6313
6314 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6315 if (unlikely(res.impl_id == NULL)) {
6316 status = -ENOMEM;
6317 goto out_server_scope;
6318 }
6319
6320 switch (sp4_how) {
6321 case SP4_NONE:
6322 args.state_protect.how = SP4_NONE;
6323 break;
6324
6325 case SP4_MACH_CRED:
6326 args.state_protect = nfs4_sp4_mach_cred_request;
6327 break;
6328
6329 default:
6330 /* unsupported! */
6331 WARN_ON_ONCE(1);
6332 status = -EINVAL;
6333 goto out_server_scope;
6334 }
6335
6336 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6337 trace_nfs4_exchange_id(clp, status);
6338 if (status == 0)
6339 status = nfs4_check_cl_exchange_flags(res.flags);
6340
6341 if (status == 0)
6342 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6343
6344 if (status == 0) {
6345 clp->cl_clientid = res.clientid;
6346 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6347 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6348 clp->cl_seqid = res.seqid;
6349
6350 kfree(clp->cl_serverowner);
6351 clp->cl_serverowner = res.server_owner;
6352 res.server_owner = NULL;
6353
6354 /* use the most recent implementation id */
6355 kfree(clp->cl_implid);
6356 clp->cl_implid = res.impl_id;
6357
6358 if (clp->cl_serverscope != NULL &&
6359 !nfs41_same_server_scope(clp->cl_serverscope,
6360 res.server_scope)) {
6361 dprintk("%s: server_scope mismatch detected\n",
6362 __func__);
6363 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6364 kfree(clp->cl_serverscope);
6365 clp->cl_serverscope = NULL;
6366 }
6367
6368 if (clp->cl_serverscope == NULL) {
6369 clp->cl_serverscope = res.server_scope;
6370 goto out;
6371 }
6372 } else
6373 kfree(res.impl_id);
6374
6375out_server_owner:
6376 kfree(res.server_owner);
6377out_server_scope:
6378 kfree(res.server_scope);
6379out:
6380 if (clp->cl_implid != NULL)
6381 dprintk("NFS reply exchange_id: Server Implementation ID: "
6382 "domain: %s, name: %s, date: %llu,%u\n",
6383 clp->cl_implid->domain, clp->cl_implid->name,
6384 clp->cl_implid->date.seconds,
6385 clp->cl_implid->date.nseconds);
6386 dprintk("NFS reply exchange_id: %d\n", status);
6387 return status;
6388}
6389
6390/*
6391 * nfs4_proc_exchange_id()
6392 *
6393 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6394 *
6395 * Since the clientid has expired, all compounds using sessions
6396 * associated with the stale clientid will be returning
6397 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6398 * be in some phase of session reset.
6399 *
6400 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6401 */
6402int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6403{
6404 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6405 int status;
6406
6407 /* try SP4_MACH_CRED if krb5i/p */
6408 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6409 authflavor == RPC_AUTH_GSS_KRB5P) {
6410 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6411 if (!status)
6412 return 0;
6413 }
6414
6415 /* try SP4_NONE */
6416 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6417}
6418
6419static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6420 struct rpc_cred *cred)
6421{
6422 struct rpc_message msg = {
6423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6424 .rpc_argp = clp,
6425 .rpc_cred = cred,
6426 };
6427 int status;
6428
6429 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6430 trace_nfs4_destroy_clientid(clp, status);
6431 if (status)
6432 dprintk("NFS: Got error %d from the server %s on "
6433 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6434 return status;
6435}
6436
6437static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6438 struct rpc_cred *cred)
6439{
6440 unsigned int loop;
6441 int ret;
6442
6443 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6444 ret = _nfs4_proc_destroy_clientid(clp, cred);
6445 switch (ret) {
6446 case -NFS4ERR_DELAY:
6447 case -NFS4ERR_CLIENTID_BUSY:
6448 ssleep(1);
6449 break;
6450 default:
6451 return ret;
6452 }
6453 }
6454 return 0;
6455}
6456
6457int nfs4_destroy_clientid(struct nfs_client *clp)
6458{
6459 struct rpc_cred *cred;
6460 int ret = 0;
6461
6462 if (clp->cl_mvops->minor_version < 1)
6463 goto out;
6464 if (clp->cl_exchange_flags == 0)
6465 goto out;
6466 if (clp->cl_preserve_clid)
6467 goto out;
6468 cred = nfs4_get_clid_cred(clp);
6469 ret = nfs4_proc_destroy_clientid(clp, cred);
6470 if (cred)
6471 put_rpccred(cred);
6472 switch (ret) {
6473 case 0:
6474 case -NFS4ERR_STALE_CLIENTID:
6475 clp->cl_exchange_flags = 0;
6476 }
6477out:
6478 return ret;
6479}
6480
6481struct nfs4_get_lease_time_data {
6482 struct nfs4_get_lease_time_args *args;
6483 struct nfs4_get_lease_time_res *res;
6484 struct nfs_client *clp;
6485};
6486
6487static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6488 void *calldata)
6489{
6490 struct nfs4_get_lease_time_data *data =
6491 (struct nfs4_get_lease_time_data *)calldata;
6492
6493 dprintk("--> %s\n", __func__);
6494 /* just setup sequence, do not trigger session recovery
6495 since we're invoked within one */
6496 nfs41_setup_sequence(data->clp->cl_session,
6497 &data->args->la_seq_args,
6498 &data->res->lr_seq_res,
6499 task);
6500 dprintk("<-- %s\n", __func__);
6501}
6502
6503/*
6504 * Called from nfs4_state_manager thread for session setup, so don't recover
6505 * from sequence operation or clientid errors.
6506 */
6507static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6508{
6509 struct nfs4_get_lease_time_data *data =
6510 (struct nfs4_get_lease_time_data *)calldata;
6511
6512 dprintk("--> %s\n", __func__);
6513 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6514 return;
6515 switch (task->tk_status) {
6516 case -NFS4ERR_DELAY:
6517 case -NFS4ERR_GRACE:
6518 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6519 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6520 task->tk_status = 0;
6521 /* fall through */
6522 case -NFS4ERR_RETRY_UNCACHED_REP:
6523 rpc_restart_call_prepare(task);
6524 return;
6525 }
6526 dprintk("<-- %s\n", __func__);
6527}
6528
6529static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6530 .rpc_call_prepare = nfs4_get_lease_time_prepare,
6531 .rpc_call_done = nfs4_get_lease_time_done,
6532};
6533
6534int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6535{
6536 struct rpc_task *task;
6537 struct nfs4_get_lease_time_args args;
6538 struct nfs4_get_lease_time_res res = {
6539 .lr_fsinfo = fsinfo,
6540 };
6541 struct nfs4_get_lease_time_data data = {
6542 .args = &args,
6543 .res = &res,
6544 .clp = clp,
6545 };
6546 struct rpc_message msg = {
6547 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6548 .rpc_argp = &args,
6549 .rpc_resp = &res,
6550 };
6551 struct rpc_task_setup task_setup = {
6552 .rpc_client = clp->cl_rpcclient,
6553 .rpc_message = &msg,
6554 .callback_ops = &nfs4_get_lease_time_ops,
6555 .callback_data = &data,
6556 .flags = RPC_TASK_TIMEOUT,
6557 };
6558 int status;
6559
6560 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6561 nfs4_set_sequence_privileged(&args.la_seq_args);
6562 dprintk("--> %s\n", __func__);
6563 task = rpc_run_task(&task_setup);
6564
6565 if (IS_ERR(task))
6566 status = PTR_ERR(task);
6567 else {
6568 status = task->tk_status;
6569 rpc_put_task(task);
6570 }
6571 dprintk("<-- %s return %d\n", __func__, status);
6572
6573 return status;
6574}
6575
6576/*
6577 * Initialize the values to be used by the client in CREATE_SESSION
6578 * If nfs4_init_session set the fore channel request and response sizes,
6579 * use them.
6580 *
6581 * Set the back channel max_resp_sz_cached to zero to force the client to
6582 * always set csa_cachethis to FALSE because the current implementation
6583 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6584 */
6585static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6586{
6587 unsigned int max_rqst_sz, max_resp_sz;
6588
6589 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6590 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6591
6592 /* Fore channel attributes */
6593 args->fc_attrs.max_rqst_sz = max_rqst_sz;
6594 args->fc_attrs.max_resp_sz = max_resp_sz;
6595 args->fc_attrs.max_ops = NFS4_MAX_OPS;
6596 args->fc_attrs.max_reqs = max_session_slots;
6597
6598 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6599 "max_ops=%u max_reqs=%u\n",
6600 __func__,
6601 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6602 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6603
6604 /* Back channel attributes */
6605 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6606 args->bc_attrs.max_resp_sz = PAGE_SIZE;
6607 args->bc_attrs.max_resp_sz_cached = 0;
6608 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6609 args->bc_attrs.max_reqs = 1;
6610
6611 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6612 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6613 __func__,
6614 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6615 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6616 args->bc_attrs.max_reqs);
6617}
6618
6619static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6620{
6621 struct nfs4_channel_attrs *sent = &args->fc_attrs;
6622 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6623
6624 if (rcvd->max_resp_sz > sent->max_resp_sz)
6625 return -EINVAL;
6626 /*
6627 * Our requested max_ops is the minimum we need; we're not
6628 * prepared to break up compounds into smaller pieces than that.
6629 * So, no point even trying to continue if the server won't
6630 * cooperate:
6631 */
6632 if (rcvd->max_ops < sent->max_ops)
6633 return -EINVAL;
6634 if (rcvd->max_reqs == 0)
6635 return -EINVAL;
6636 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6637 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6638 return 0;
6639}
6640
6641static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6642{
6643 struct nfs4_channel_attrs *sent = &args->bc_attrs;
6644 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6645
6646 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6647 return -EINVAL;
6648 if (rcvd->max_resp_sz < sent->max_resp_sz)
6649 return -EINVAL;
6650 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6651 return -EINVAL;
6652 /* These would render the backchannel useless: */
6653 if (rcvd->max_ops != sent->max_ops)
6654 return -EINVAL;
6655 if (rcvd->max_reqs != sent->max_reqs)
6656 return -EINVAL;
6657 return 0;
6658}
6659
6660static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6661 struct nfs4_session *session)
6662{
6663 int ret;
6664
6665 ret = nfs4_verify_fore_channel_attrs(args, session);
6666 if (ret)
6667 return ret;
6668 return nfs4_verify_back_channel_attrs(args, session);
6669}
6670
6671static int _nfs4_proc_create_session(struct nfs_client *clp,
6672 struct rpc_cred *cred)
6673{
6674 struct nfs4_session *session = clp->cl_session;
6675 struct nfs41_create_session_args args = {
6676 .client = clp,
6677 .cb_program = NFS4_CALLBACK,
6678 };
6679 struct nfs41_create_session_res res = {
6680 .client = clp,
6681 };
6682 struct rpc_message msg = {
6683 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6684 .rpc_argp = &args,
6685 .rpc_resp = &res,
6686 .rpc_cred = cred,
6687 };
6688 int status;
6689
6690 nfs4_init_channel_attrs(&args);
6691 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6692
6693 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6694 trace_nfs4_create_session(clp, status);
6695
6696 if (!status) {
6697 /* Verify the session's negotiated channel_attrs values */
6698 status = nfs4_verify_channel_attrs(&args, session);
6699 /* Increment the clientid slot sequence id */
6700 clp->cl_seqid++;
6701 }
6702
6703 return status;
6704}
6705
6706/*
6707 * Issues a CREATE_SESSION operation to the server.
6708 * It is the responsibility of the caller to verify the session is
6709 * expired before calling this routine.
6710 */
6711int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6712{
6713 int status;
6714 unsigned *ptr;
6715 struct nfs4_session *session = clp->cl_session;
6716
6717 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6718
6719 status = _nfs4_proc_create_session(clp, cred);
6720 if (status)
6721 goto out;
6722
6723 /* Init or reset the session slot tables */
6724 status = nfs4_setup_session_slot_tables(session);
6725 dprintk("slot table setup returned %d\n", status);
6726 if (status)
6727 goto out;
6728
6729 ptr = (unsigned *)&session->sess_id.data[0];
6730 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6731 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6732out:
6733 dprintk("<-- %s\n", __func__);
6734 return status;
6735}
6736
6737/*
6738 * Issue the over-the-wire RPC DESTROY_SESSION.
6739 * The caller must serialize access to this routine.
6740 */
6741int nfs4_proc_destroy_session(struct nfs4_session *session,
6742 struct rpc_cred *cred)
6743{
6744 struct rpc_message msg = {
6745 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6746 .rpc_argp = session,
6747 .rpc_cred = cred,
6748 };
6749 int status = 0;
6750
6751 dprintk("--> nfs4_proc_destroy_session\n");
6752
6753 /* session is still being setup */
6754 if (session->clp->cl_cons_state != NFS_CS_READY)
6755 return status;
6756
6757 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6758 trace_nfs4_destroy_session(session->clp, status);
6759
6760 if (status)
6761 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6762 "Session has been destroyed regardless...\n", status);
6763
6764 dprintk("<-- nfs4_proc_destroy_session\n");
6765 return status;
6766}
6767
6768/*
6769 * Renew the cl_session lease.
6770 */
6771struct nfs4_sequence_data {
6772 struct nfs_client *clp;
6773 struct nfs4_sequence_args args;
6774 struct nfs4_sequence_res res;
6775};
6776
6777static void nfs41_sequence_release(void *data)
6778{
6779 struct nfs4_sequence_data *calldata = data;
6780 struct nfs_client *clp = calldata->clp;
6781
6782 if (atomic_read(&clp->cl_count) > 1)
6783 nfs4_schedule_state_renewal(clp);
6784 nfs_put_client(clp);
6785 kfree(calldata);
6786}
6787
6788static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6789{
6790 switch(task->tk_status) {
6791 case -NFS4ERR_DELAY:
6792 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6793 return -EAGAIN;
6794 default:
6795 nfs4_schedule_lease_recovery(clp);
6796 }
6797 return 0;
6798}
6799
6800static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6801{
6802 struct nfs4_sequence_data *calldata = data;
6803 struct nfs_client *clp = calldata->clp;
6804
6805 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6806 return;
6807
6808 trace_nfs4_sequence(clp, task->tk_status);
6809 if (task->tk_status < 0) {
6810 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6811 if (atomic_read(&clp->cl_count) == 1)
6812 goto out;
6813
6814 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6815 rpc_restart_call_prepare(task);
6816 return;
6817 }
6818 }
6819 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6820out:
6821 dprintk("<-- %s\n", __func__);
6822}
6823
6824static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6825{
6826 struct nfs4_sequence_data *calldata = data;
6827 struct nfs_client *clp = calldata->clp;
6828 struct nfs4_sequence_args *args;
6829 struct nfs4_sequence_res *res;
6830
6831 args = task->tk_msg.rpc_argp;
6832 res = task->tk_msg.rpc_resp;
6833
6834 nfs41_setup_sequence(clp->cl_session, args, res, task);
6835}
6836
6837static const struct rpc_call_ops nfs41_sequence_ops = {
6838 .rpc_call_done = nfs41_sequence_call_done,
6839 .rpc_call_prepare = nfs41_sequence_prepare,
6840 .rpc_release = nfs41_sequence_release,
6841};
6842
6843static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6844 struct rpc_cred *cred,
6845 bool is_privileged)
6846{
6847 struct nfs4_sequence_data *calldata;
6848 struct rpc_message msg = {
6849 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6850 .rpc_cred = cred,
6851 };
6852 struct rpc_task_setup task_setup_data = {
6853 .rpc_client = clp->cl_rpcclient,
6854 .rpc_message = &msg,
6855 .callback_ops = &nfs41_sequence_ops,
6856 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6857 };
6858
6859 if (!atomic_inc_not_zero(&clp->cl_count))
6860 return ERR_PTR(-EIO);
6861 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6862 if (calldata == NULL) {
6863 nfs_put_client(clp);
6864 return ERR_PTR(-ENOMEM);
6865 }
6866 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
6867 if (is_privileged)
6868 nfs4_set_sequence_privileged(&calldata->args);
6869 msg.rpc_argp = &calldata->args;
6870 msg.rpc_resp = &calldata->res;
6871 calldata->clp = clp;
6872 task_setup_data.callback_data = calldata;
6873
6874 return rpc_run_task(&task_setup_data);
6875}
6876
6877static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6878{
6879 struct rpc_task *task;
6880 int ret = 0;
6881
6882 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6883 return 0;
6884 task = _nfs41_proc_sequence(clp, cred, false);
6885 if (IS_ERR(task))
6886 ret = PTR_ERR(task);
6887 else
6888 rpc_put_task_async(task);
6889 dprintk("<-- %s status=%d\n", __func__, ret);
6890 return ret;
6891}
6892
6893static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6894{
6895 struct rpc_task *task;
6896 int ret;
6897
6898 task = _nfs41_proc_sequence(clp, cred, true);
6899 if (IS_ERR(task)) {
6900 ret = PTR_ERR(task);
6901 goto out;
6902 }
6903 ret = rpc_wait_for_completion_task(task);
6904 if (!ret) {
6905 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6906
6907 if (task->tk_status == 0)
6908 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6909 ret = task->tk_status;
6910 }
6911 rpc_put_task(task);
6912out:
6913 dprintk("<-- %s status=%d\n", __func__, ret);
6914 return ret;
6915}
6916
6917struct nfs4_reclaim_complete_data {
6918 struct nfs_client *clp;
6919 struct nfs41_reclaim_complete_args arg;
6920 struct nfs41_reclaim_complete_res res;
6921};
6922
6923static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6924{
6925 struct nfs4_reclaim_complete_data *calldata = data;
6926
6927 nfs41_setup_sequence(calldata->clp->cl_session,
6928 &calldata->arg.seq_args,
6929 &calldata->res.seq_res,
6930 task);
6931}
6932
6933static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6934{
6935 switch(task->tk_status) {
6936 case 0:
6937 case -NFS4ERR_COMPLETE_ALREADY:
6938 case -NFS4ERR_WRONG_CRED: /* What to do here? */
6939 break;
6940 case -NFS4ERR_DELAY:
6941 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6942 /* fall through */
6943 case -NFS4ERR_RETRY_UNCACHED_REP:
6944 return -EAGAIN;
6945 default:
6946 nfs4_schedule_lease_recovery(clp);
6947 }
6948 return 0;
6949}
6950
6951static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6952{
6953 struct nfs4_reclaim_complete_data *calldata = data;
6954 struct nfs_client *clp = calldata->clp;
6955 struct nfs4_sequence_res *res = &calldata->res.seq_res;
6956
6957 dprintk("--> %s\n", __func__);
6958 if (!nfs41_sequence_done(task, res))
6959 return;
6960
6961 trace_nfs4_reclaim_complete(clp, task->tk_status);
6962 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6963 rpc_restart_call_prepare(task);
6964 return;
6965 }
6966 dprintk("<-- %s\n", __func__);
6967}
6968
6969static void nfs4_free_reclaim_complete_data(void *data)
6970{
6971 struct nfs4_reclaim_complete_data *calldata = data;
6972
6973 kfree(calldata);
6974}
6975
6976static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6977 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6978 .rpc_call_done = nfs4_reclaim_complete_done,
6979 .rpc_release = nfs4_free_reclaim_complete_data,
6980};
6981
6982/*
6983 * Issue a global reclaim complete.
6984 */
6985static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6986 struct rpc_cred *cred)
6987{
6988 struct nfs4_reclaim_complete_data *calldata;
6989 struct rpc_task *task;
6990 struct rpc_message msg = {
6991 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6992 .rpc_cred = cred,
6993 };
6994 struct rpc_task_setup task_setup_data = {
6995 .rpc_client = clp->cl_rpcclient,
6996 .rpc_message = &msg,
6997 .callback_ops = &nfs4_reclaim_complete_call_ops,
6998 .flags = RPC_TASK_ASYNC,
6999 };
7000 int status = -ENOMEM;
7001
7002 dprintk("--> %s\n", __func__);
7003 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7004 if (calldata == NULL)
7005 goto out;
7006 calldata->clp = clp;
7007 calldata->arg.one_fs = 0;
7008
7009 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7010 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7011 msg.rpc_argp = &calldata->arg;
7012 msg.rpc_resp = &calldata->res;
7013 task_setup_data.callback_data = calldata;
7014 task = rpc_run_task(&task_setup_data);
7015 if (IS_ERR(task)) {
7016 status = PTR_ERR(task);
7017 goto out;
7018 }
7019 status = nfs4_wait_for_completion_rpc_task(task);
7020 if (status == 0)
7021 status = task->tk_status;
7022 rpc_put_task(task);
7023 return 0;
7024out:
7025 dprintk("<-- %s status=%d\n", __func__, status);
7026 return status;
7027}
7028
7029static void
7030nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7031{
7032 struct nfs4_layoutget *lgp = calldata;
7033 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7034 struct nfs4_session *session = nfs4_get_session(server);
7035
7036 dprintk("--> %s\n", __func__);
7037 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7038 * right now covering the LAYOUTGET we are about to send.
7039 * However, that is not so catastrophic, and there seems
7040 * to be no way to prevent it completely.
7041 */
7042 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7043 &lgp->res.seq_res, task))
7044 return;
7045 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7046 NFS_I(lgp->args.inode)->layout,
7047 lgp->args.ctx->state)) {
7048 rpc_exit(task, NFS4_OK);
7049 }
7050}
7051
7052static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7053{
7054 struct nfs4_layoutget *lgp = calldata;
7055 struct inode *inode = lgp->args.inode;
7056 struct nfs_server *server = NFS_SERVER(inode);
7057 struct pnfs_layout_hdr *lo;
7058 struct nfs4_state *state = NULL;
7059 unsigned long timeo, giveup;
7060
7061 dprintk("--> %s\n", __func__);
7062
7063 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7064 goto out;
7065
7066 switch (task->tk_status) {
7067 case 0:
7068 goto out;
7069 case -NFS4ERR_LAYOUTTRYLATER:
7070 case -NFS4ERR_RECALLCONFLICT:
7071 timeo = rpc_get_timeout(task->tk_client);
7072 giveup = lgp->args.timestamp + timeo;
7073 if (time_after(giveup, jiffies))
7074 task->tk_status = -NFS4ERR_DELAY;
7075 break;
7076 case -NFS4ERR_EXPIRED:
7077 case -NFS4ERR_BAD_STATEID:
7078 spin_lock(&inode->i_lock);
7079 lo = NFS_I(inode)->layout;
7080 if (!lo || list_empty(&lo->plh_segs)) {
7081 spin_unlock(&inode->i_lock);
7082 /* If the open stateid was bad, then recover it. */
7083 state = lgp->args.ctx->state;
7084 } else {
7085 LIST_HEAD(head);
7086
7087 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7088 spin_unlock(&inode->i_lock);
7089 /* Mark the bad layout state as invalid, then
7090 * retry using the open stateid. */
7091 pnfs_free_lseg_list(&head);
7092 }
7093 }
7094 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7095 rpc_restart_call_prepare(task);
7096out:
7097 dprintk("<-- %s\n", __func__);
7098}
7099
7100static size_t max_response_pages(struct nfs_server *server)
7101{
7102 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7103 return nfs_page_array_len(0, max_resp_sz);
7104}
7105
7106static void nfs4_free_pages(struct page **pages, size_t size)
7107{
7108 int i;
7109
7110 if (!pages)
7111 return;
7112
7113 for (i = 0; i < size; i++) {
7114 if (!pages[i])
7115 break;
7116 __free_page(pages[i]);
7117 }
7118 kfree(pages);
7119}
7120
7121static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7122{
7123 struct page **pages;
7124 int i;
7125
7126 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7127 if (!pages) {
7128 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7129 return NULL;
7130 }
7131
7132 for (i = 0; i < size; i++) {
7133 pages[i] = alloc_page(gfp_flags);
7134 if (!pages[i]) {
7135 dprintk("%s: failed to allocate page\n", __func__);
7136 nfs4_free_pages(pages, size);
7137 return NULL;
7138 }
7139 }
7140
7141 return pages;
7142}
7143
7144static void nfs4_layoutget_release(void *calldata)
7145{
7146 struct nfs4_layoutget *lgp = calldata;
7147 struct inode *inode = lgp->args.inode;
7148 struct nfs_server *server = NFS_SERVER(inode);
7149 size_t max_pages = max_response_pages(server);
7150
7151 dprintk("--> %s\n", __func__);
7152 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7153 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7154 put_nfs_open_context(lgp->args.ctx);
7155 kfree(calldata);
7156 dprintk("<-- %s\n", __func__);
7157}
7158
7159static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7160 .rpc_call_prepare = nfs4_layoutget_prepare,
7161 .rpc_call_done = nfs4_layoutget_done,
7162 .rpc_release = nfs4_layoutget_release,
7163};
7164
7165struct pnfs_layout_segment *
7166nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7167{
7168 struct inode *inode = lgp->args.inode;
7169 struct nfs_server *server = NFS_SERVER(inode);
7170 size_t max_pages = max_response_pages(server);
7171 struct rpc_task *task;
7172 struct rpc_message msg = {
7173 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7174 .rpc_argp = &lgp->args,
7175 .rpc_resp = &lgp->res,
7176 .rpc_cred = lgp->cred,
7177 };
7178 struct rpc_task_setup task_setup_data = {
7179 .rpc_client = server->client,
7180 .rpc_message = &msg,
7181 .callback_ops = &nfs4_layoutget_call_ops,
7182 .callback_data = lgp,
7183 .flags = RPC_TASK_ASYNC,
7184 };
7185 struct pnfs_layout_segment *lseg = NULL;
7186 int status = 0;
7187
7188 dprintk("--> %s\n", __func__);
7189
7190 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7191 if (!lgp->args.layout.pages) {
7192 nfs4_layoutget_release(lgp);
7193 return ERR_PTR(-ENOMEM);
7194 }
7195 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7196 lgp->args.timestamp = jiffies;
7197
7198 lgp->res.layoutp = &lgp->args.layout;
7199 lgp->res.seq_res.sr_slot = NULL;
7200 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7201
7202 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7203 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7204
7205 task = rpc_run_task(&task_setup_data);
7206 if (IS_ERR(task))
7207 return ERR_CAST(task);
7208 status = nfs4_wait_for_completion_rpc_task(task);
7209 if (status == 0)
7210 status = task->tk_status;
7211 trace_nfs4_layoutget(lgp->args.ctx,
7212 &lgp->args.range,
7213 &lgp->res.range,
7214 status);
7215 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7216 if (status == 0 && lgp->res.layoutp->len)
7217 lseg = pnfs_layout_process(lgp);
7218 rpc_put_task(task);
7219 dprintk("<-- %s status=%d\n", __func__, status);
7220 if (status)
7221 return ERR_PTR(status);
7222 return lseg;
7223}
7224
7225static void
7226nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7227{
7228 struct nfs4_layoutreturn *lrp = calldata;
7229
7230 dprintk("--> %s\n", __func__);
7231 nfs41_setup_sequence(lrp->clp->cl_session,
7232 &lrp->args.seq_args,
7233 &lrp->res.seq_res,
7234 task);
7235}
7236
7237static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7238{
7239 struct nfs4_layoutreturn *lrp = calldata;
7240 struct nfs_server *server;
7241
7242 dprintk("--> %s\n", __func__);
7243
7244 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7245 return;
7246
7247 server = NFS_SERVER(lrp->args.inode);
7248 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7249 rpc_restart_call_prepare(task);
7250 return;
7251 }
7252 dprintk("<-- %s\n", __func__);
7253}
7254
7255static void nfs4_layoutreturn_release(void *calldata)
7256{
7257 struct nfs4_layoutreturn *lrp = calldata;
7258 struct pnfs_layout_hdr *lo = lrp->args.layout;
7259
7260 dprintk("--> %s\n", __func__);
7261 spin_lock(&lo->plh_inode->i_lock);
7262 if (lrp->res.lrs_present)
7263 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7264 lo->plh_block_lgets--;
7265 spin_unlock(&lo->plh_inode->i_lock);
7266 pnfs_put_layout_hdr(lrp->args.layout);
7267 kfree(calldata);
7268 dprintk("<-- %s\n", __func__);
7269}
7270
7271static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7272 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7273 .rpc_call_done = nfs4_layoutreturn_done,
7274 .rpc_release = nfs4_layoutreturn_release,
7275};
7276
7277int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7278{
7279 struct rpc_task *task;
7280 struct rpc_message msg = {
7281 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7282 .rpc_argp = &lrp->args,
7283 .rpc_resp = &lrp->res,
7284 .rpc_cred = lrp->cred,
7285 };
7286 struct rpc_task_setup task_setup_data = {
7287 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7288 .rpc_message = &msg,
7289 .callback_ops = &nfs4_layoutreturn_call_ops,
7290 .callback_data = lrp,
7291 };
7292 int status;
7293
7294 dprintk("--> %s\n", __func__);
7295 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7296 task = rpc_run_task(&task_setup_data);
7297 if (IS_ERR(task))
7298 return PTR_ERR(task);
7299 status = task->tk_status;
7300 trace_nfs4_layoutreturn(lrp->args.inode, status);
7301 dprintk("<-- %s status=%d\n", __func__, status);
7302 rpc_put_task(task);
7303 return status;
7304}
7305
7306/*
7307 * Retrieve the list of Data Server devices from the MDS.
7308 */
7309static int _nfs4_getdevicelist(struct nfs_server *server,
7310 const struct nfs_fh *fh,
7311 struct pnfs_devicelist *devlist)
7312{
7313 struct nfs4_getdevicelist_args args = {
7314 .fh = fh,
7315 .layoutclass = server->pnfs_curr_ld->id,
7316 };
7317 struct nfs4_getdevicelist_res res = {
7318 .devlist = devlist,
7319 };
7320 struct rpc_message msg = {
7321 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7322 .rpc_argp = &args,
7323 .rpc_resp = &res,
7324 };
7325 int status;
7326
7327 dprintk("--> %s\n", __func__);
7328 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7329 &res.seq_res, 0);
7330 dprintk("<-- %s status=%d\n", __func__, status);
7331 return status;
7332}
7333
7334int nfs4_proc_getdevicelist(struct nfs_server *server,
7335 const struct nfs_fh *fh,
7336 struct pnfs_devicelist *devlist)
7337{
7338 struct nfs4_exception exception = { };
7339 int err;
7340
7341 do {
7342 err = nfs4_handle_exception(server,
7343 _nfs4_getdevicelist(server, fh, devlist),
7344 &exception);
7345 } while (exception.retry);
7346
7347 dprintk("%s: err=%d, num_devs=%u\n", __func__,
7348 err, devlist->num_devs);
7349
7350 return err;
7351}
7352EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7353
7354static int
7355_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7356 struct pnfs_device *pdev,
7357 struct rpc_cred *cred)
7358{
7359 struct nfs4_getdeviceinfo_args args = {
7360 .pdev = pdev,
7361 };
7362 struct nfs4_getdeviceinfo_res res = {
7363 .pdev = pdev,
7364 };
7365 struct rpc_message msg = {
7366 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7367 .rpc_argp = &args,
7368 .rpc_resp = &res,
7369 .rpc_cred = cred,
7370 };
7371 int status;
7372
7373 dprintk("--> %s\n", __func__);
7374 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7375 dprintk("<-- %s status=%d\n", __func__, status);
7376
7377 return status;
7378}
7379
7380int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7381 struct pnfs_device *pdev,
7382 struct rpc_cred *cred)
7383{
7384 struct nfs4_exception exception = { };
7385 int err;
7386
7387 do {
7388 err = nfs4_handle_exception(server,
7389 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7390 &exception);
7391 } while (exception.retry);
7392 return err;
7393}
7394EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7395
7396static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7397{
7398 struct nfs4_layoutcommit_data *data = calldata;
7399 struct nfs_server *server = NFS_SERVER(data->args.inode);
7400 struct nfs4_session *session = nfs4_get_session(server);
7401
7402 nfs41_setup_sequence(session,
7403 &data->args.seq_args,
7404 &data->res.seq_res,
7405 task);
7406}
7407
7408static void
7409nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7410{
7411 struct nfs4_layoutcommit_data *data = calldata;
7412 struct nfs_server *server = NFS_SERVER(data->args.inode);
7413
7414 if (!nfs41_sequence_done(task, &data->res.seq_res))
7415 return;
7416
7417 switch (task->tk_status) { /* Just ignore these failures */
7418 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7419 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7420 case -NFS4ERR_BADLAYOUT: /* no layout */
7421 case -NFS4ERR_GRACE: /* loca_recalim always false */
7422 task->tk_status = 0;
7423 break;
7424 case 0:
7425 nfs_post_op_update_inode_force_wcc(data->args.inode,
7426 data->res.fattr);
7427 break;
7428 default:
7429 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7430 rpc_restart_call_prepare(task);
7431 return;
7432 }
7433 }
7434}
7435
7436static void nfs4_layoutcommit_release(void *calldata)
7437{
7438 struct nfs4_layoutcommit_data *data = calldata;
7439
7440 pnfs_cleanup_layoutcommit(data);
7441 put_rpccred(data->cred);
7442 kfree(data);
7443}
7444
7445static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7446 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7447 .rpc_call_done = nfs4_layoutcommit_done,
7448 .rpc_release = nfs4_layoutcommit_release,
7449};
7450
7451int
7452nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7453{
7454 struct rpc_message msg = {
7455 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7456 .rpc_argp = &data->args,
7457 .rpc_resp = &data->res,
7458 .rpc_cred = data->cred,
7459 };
7460 struct rpc_task_setup task_setup_data = {
7461 .task = &data->task,
7462 .rpc_client = NFS_CLIENT(data->args.inode),
7463 .rpc_message = &msg,
7464 .callback_ops = &nfs4_layoutcommit_ops,
7465 .callback_data = data,
7466 .flags = RPC_TASK_ASYNC,
7467 };
7468 struct rpc_task *task;
7469 int status = 0;
7470
7471 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7472 "lbw: %llu inode %lu\n",
7473 data->task.tk_pid, sync,
7474 data->args.lastbytewritten,
7475 data->args.inode->i_ino);
7476
7477 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7478 task = rpc_run_task(&task_setup_data);
7479 if (IS_ERR(task))
7480 return PTR_ERR(task);
7481 if (sync == false)
7482 goto out;
7483 status = nfs4_wait_for_completion_rpc_task(task);
7484 if (status != 0)
7485 goto out;
7486 status = task->tk_status;
7487 trace_nfs4_layoutcommit(data->args.inode, status);
7488out:
7489 dprintk("%s: status %d\n", __func__, status);
7490 rpc_put_task(task);
7491 return status;
7492}
7493
7494/**
7495 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7496 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7497 */
7498static int
7499_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7500 struct nfs_fsinfo *info,
7501 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7502{
7503 struct nfs41_secinfo_no_name_args args = {
7504 .style = SECINFO_STYLE_CURRENT_FH,
7505 };
7506 struct nfs4_secinfo_res res = {
7507 .flavors = flavors,
7508 };
7509 struct rpc_message msg = {
7510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7511 .rpc_argp = &args,
7512 .rpc_resp = &res,
7513 };
7514 struct rpc_clnt *clnt = server->client;
7515 struct rpc_cred *cred = NULL;
7516 int status;
7517
7518 if (use_integrity) {
7519 clnt = server->nfs_client->cl_rpcclient;
7520 cred = nfs4_get_clid_cred(server->nfs_client);
7521 msg.rpc_cred = cred;
7522 }
7523
7524 dprintk("--> %s\n", __func__);
7525 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7526 &res.seq_res, 0);
7527 dprintk("<-- %s status=%d\n", __func__, status);
7528
7529 if (cred)
7530 put_rpccred(cred);
7531
7532 return status;
7533}
7534
7535static int
7536nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7537 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7538{
7539 struct nfs4_exception exception = { };
7540 int err;
7541 do {
7542 /* first try using integrity protection */
7543 err = -NFS4ERR_WRONGSEC;
7544
7545 /* try to use integrity protection with machine cred */
7546 if (_nfs4_is_integrity_protected(server->nfs_client))
7547 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7548 flavors, true);
7549
7550 /*
7551 * if unable to use integrity protection, or SECINFO with
7552 * integrity protection returns NFS4ERR_WRONGSEC (which is
7553 * disallowed by spec, but exists in deployed servers) use
7554 * the current filesystem's rpc_client and the user cred.
7555 */
7556 if (err == -NFS4ERR_WRONGSEC)
7557 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7558 flavors, false);
7559
7560 switch (err) {
7561 case 0:
7562 case -NFS4ERR_WRONGSEC:
7563 case -NFS4ERR_NOTSUPP:
7564 goto out;
7565 default:
7566 err = nfs4_handle_exception(server, err, &exception);
7567 }
7568 } while (exception.retry);
7569out:
7570 return err;
7571}
7572
7573static int
7574nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7575 struct nfs_fsinfo *info)
7576{
7577 int err;
7578 struct page *page;
7579 rpc_authflavor_t flavor;
7580 struct nfs4_secinfo_flavors *flavors;
7581
7582 page = alloc_page(GFP_KERNEL);
7583 if (!page) {
7584 err = -ENOMEM;
7585 goto out;
7586 }
7587
7588 flavors = page_address(page);
7589 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7590
7591 /*
7592 * Fall back on "guess and check" method if
7593 * the server doesn't support SECINFO_NO_NAME
7594 */
7595 if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7596 err = nfs4_find_root_sec(server, fhandle, info);
7597 goto out_freepage;
7598 }
7599 if (err)
7600 goto out_freepage;
7601
7602 flavor = nfs_find_best_sec(flavors);
7603 if (err == 0)
7604 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7605
7606out_freepage:
7607 put_page(page);
7608 if (err == -EACCES)
7609 return -EPERM;
7610out:
7611 return err;
7612}
7613
7614static int _nfs41_test_stateid(struct nfs_server *server,
7615 nfs4_stateid *stateid,
7616 struct rpc_cred *cred)
7617{
7618 int status;
7619 struct nfs41_test_stateid_args args = {
7620 .stateid = stateid,
7621 };
7622 struct nfs41_test_stateid_res res;
7623 struct rpc_message msg = {
7624 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7625 .rpc_argp = &args,
7626 .rpc_resp = &res,
7627 .rpc_cred = cred,
7628 };
7629 struct rpc_clnt *rpc_client = server->client;
7630
7631 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7632 &rpc_client, &msg);
7633
7634 dprintk("NFS call test_stateid %p\n", stateid);
7635 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7636 nfs4_set_sequence_privileged(&args.seq_args);
7637 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
7638 &args.seq_args, &res.seq_res);
7639 if (status != NFS_OK) {
7640 dprintk("NFS reply test_stateid: failed, %d\n", status);
7641 return status;
7642 }
7643 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7644 return -res.status;
7645}
7646
7647/**
7648 * nfs41_test_stateid - perform a TEST_STATEID operation
7649 *
7650 * @server: server / transport on which to perform the operation
7651 * @stateid: state ID to test
7652 * @cred: credential
7653 *
7654 * Returns NFS_OK if the server recognizes that "stateid" is valid.
7655 * Otherwise a negative NFS4ERR value is returned if the operation
7656 * failed or the state ID is not currently valid.
7657 */
7658static int nfs41_test_stateid(struct nfs_server *server,
7659 nfs4_stateid *stateid,
7660 struct rpc_cred *cred)
7661{
7662 struct nfs4_exception exception = { };
7663 int err;
7664 do {
7665 err = _nfs41_test_stateid(server, stateid, cred);
7666 if (err != -NFS4ERR_DELAY)
7667 break;
7668 nfs4_handle_exception(server, err, &exception);
7669 } while (exception.retry);
7670 return err;
7671}
7672
7673struct nfs_free_stateid_data {
7674 struct nfs_server *server;
7675 struct nfs41_free_stateid_args args;
7676 struct nfs41_free_stateid_res res;
7677};
7678
7679static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7680{
7681 struct nfs_free_stateid_data *data = calldata;
7682 nfs41_setup_sequence(nfs4_get_session(data->server),
7683 &data->args.seq_args,
7684 &data->res.seq_res,
7685 task);
7686}
7687
7688static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7689{
7690 struct nfs_free_stateid_data *data = calldata;
7691
7692 nfs41_sequence_done(task, &data->res.seq_res);
7693
7694 switch (task->tk_status) {
7695 case -NFS4ERR_DELAY:
7696 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7697 rpc_restart_call_prepare(task);
7698 }
7699}
7700
7701static void nfs41_free_stateid_release(void *calldata)
7702{
7703 kfree(calldata);
7704}
7705
7706static const struct rpc_call_ops nfs41_free_stateid_ops = {
7707 .rpc_call_prepare = nfs41_free_stateid_prepare,
7708 .rpc_call_done = nfs41_free_stateid_done,
7709 .rpc_release = nfs41_free_stateid_release,
7710};
7711
7712static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7713 nfs4_stateid *stateid,
7714 struct rpc_cred *cred,
7715 bool privileged)
7716{
7717 struct rpc_message msg = {
7718 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7719 .rpc_cred = cred,
7720 };
7721 struct rpc_task_setup task_setup = {
7722 .rpc_client = server->client,
7723 .rpc_message = &msg,
7724 .callback_ops = &nfs41_free_stateid_ops,
7725 .flags = RPC_TASK_ASYNC,
7726 };
7727 struct nfs_free_stateid_data *data;
7728
7729 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7730 &task_setup.rpc_client, &msg);
7731
7732 dprintk("NFS call free_stateid %p\n", stateid);
7733 data = kmalloc(sizeof(*data), GFP_NOFS);
7734 if (!data)
7735 return ERR_PTR(-ENOMEM);
7736 data->server = server;
7737 nfs4_stateid_copy(&data->args.stateid, stateid);
7738
7739 task_setup.callback_data = data;
7740
7741 msg.rpc_argp = &data->args;
7742 msg.rpc_resp = &data->res;
7743 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7744 if (privileged)
7745 nfs4_set_sequence_privileged(&data->args.seq_args);
7746
7747 return rpc_run_task(&task_setup);
7748}
7749
7750/**
7751 * nfs41_free_stateid - perform a FREE_STATEID operation
7752 *
7753 * @server: server / transport on which to perform the operation
7754 * @stateid: state ID to release
7755 * @cred: credential
7756 *
7757 * Returns NFS_OK if the server freed "stateid". Otherwise a
7758 * negative NFS4ERR value is returned.
7759 */
7760static int nfs41_free_stateid(struct nfs_server *server,
7761 nfs4_stateid *stateid,
7762 struct rpc_cred *cred)
7763{
7764 struct rpc_task *task;
7765 int ret;
7766
7767 task = _nfs41_free_stateid(server, stateid, cred, true);
7768 if (IS_ERR(task))
7769 return PTR_ERR(task);
7770 ret = rpc_wait_for_completion_task(task);
7771 if (!ret)
7772 ret = task->tk_status;
7773 rpc_put_task(task);
7774 return ret;
7775}
7776
7777static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7778{
7779 struct rpc_task *task;
7780 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7781
7782 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7783 nfs4_free_lock_state(server, lsp);
7784 if (IS_ERR(task))
7785 return PTR_ERR(task);
7786 rpc_put_task(task);
7787 return 0;
7788}
7789
7790static bool nfs41_match_stateid(const nfs4_stateid *s1,
7791 const nfs4_stateid *s2)
7792{
7793 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7794 return false;
7795
7796 if (s1->seqid == s2->seqid)
7797 return true;
7798 if (s1->seqid == 0 || s2->seqid == 0)
7799 return true;
7800
7801 return false;
7802}
7803
7804#endif /* CONFIG_NFS_V4_1 */
7805
7806static bool nfs4_match_stateid(const nfs4_stateid *s1,
7807 const nfs4_stateid *s2)
7808{
7809 return nfs4_stateid_match(s1, s2);
7810}
7811
7812
7813static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7814 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7815 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7816 .recover_open = nfs4_open_reclaim,
7817 .recover_lock = nfs4_lock_reclaim,
7818 .establish_clid = nfs4_init_clientid,
7819 .detect_trunking = nfs40_discover_server_trunking,
7820};
7821
7822#if defined(CONFIG_NFS_V4_1)
7823static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7824 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7825 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7826 .recover_open = nfs4_open_reclaim,
7827 .recover_lock = nfs4_lock_reclaim,
7828 .establish_clid = nfs41_init_clientid,
7829 .reclaim_complete = nfs41_proc_reclaim_complete,
7830 .detect_trunking = nfs41_discover_server_trunking,
7831};
7832#endif /* CONFIG_NFS_V4_1 */
7833
7834static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7835 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7836 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7837 .recover_open = nfs4_open_expired,
7838 .recover_lock = nfs4_lock_expired,
7839 .establish_clid = nfs4_init_clientid,
7840};
7841
7842#if defined(CONFIG_NFS_V4_1)
7843static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7844 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7845 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7846 .recover_open = nfs41_open_expired,
7847 .recover_lock = nfs41_lock_expired,
7848 .establish_clid = nfs41_init_clientid,
7849};
7850#endif /* CONFIG_NFS_V4_1 */
7851
7852static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7853 .sched_state_renewal = nfs4_proc_async_renew,
7854 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7855 .renew_lease = nfs4_proc_renew,
7856};
7857
7858#if defined(CONFIG_NFS_V4_1)
7859static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7860 .sched_state_renewal = nfs41_proc_async_sequence,
7861 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7862 .renew_lease = nfs4_proc_sequence,
7863};
7864#endif
7865
7866static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7867 .minor_version = 0,
7868 .init_caps = NFS_CAP_READDIRPLUS
7869 | NFS_CAP_ATOMIC_OPEN
7870 | NFS_CAP_CHANGE_ATTR
7871 | NFS_CAP_POSIX_LOCK,
7872 .init_client = nfs40_init_client,
7873 .shutdown_client = nfs40_shutdown_client,
7874 .match_stateid = nfs4_match_stateid,
7875 .find_root_sec = nfs4_find_root_sec,
7876 .free_lock_state = nfs4_release_lockowner,
7877 .call_sync_ops = &nfs40_call_sync_ops,
7878 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7879 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7880 .state_renewal_ops = &nfs40_state_renewal_ops,
7881};
7882
7883#if defined(CONFIG_NFS_V4_1)
7884static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7885 .minor_version = 1,
7886 .init_caps = NFS_CAP_READDIRPLUS
7887 | NFS_CAP_ATOMIC_OPEN
7888 | NFS_CAP_CHANGE_ATTR
7889 | NFS_CAP_POSIX_LOCK
7890 | NFS_CAP_STATEID_NFSV41
7891 | NFS_CAP_ATOMIC_OPEN_V1,
7892 .init_client = nfs41_init_client,
7893 .shutdown_client = nfs41_shutdown_client,
7894 .match_stateid = nfs41_match_stateid,
7895 .find_root_sec = nfs41_find_root_sec,
7896 .free_lock_state = nfs41_free_lock_state,
7897 .call_sync_ops = &nfs41_call_sync_ops,
7898 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7899 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7900 .state_renewal_ops = &nfs41_state_renewal_ops,
7901};
7902#endif
7903
7904#if defined(CONFIG_NFS_V4_2)
7905static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7906 .minor_version = 2,
7907 .init_caps = NFS_CAP_READDIRPLUS
7908 | NFS_CAP_ATOMIC_OPEN
7909 | NFS_CAP_CHANGE_ATTR
7910 | NFS_CAP_POSIX_LOCK
7911 | NFS_CAP_STATEID_NFSV41
7912 | NFS_CAP_ATOMIC_OPEN_V1,
7913 .init_client = nfs41_init_client,
7914 .shutdown_client = nfs41_shutdown_client,
7915 .match_stateid = nfs41_match_stateid,
7916 .find_root_sec = nfs41_find_root_sec,
7917 .free_lock_state = nfs41_free_lock_state,
7918 .call_sync_ops = &nfs41_call_sync_ops,
7919 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7920 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7921 .state_renewal_ops = &nfs41_state_renewal_ops,
7922};
7923#endif
7924
7925const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7926 [0] = &nfs_v4_0_minor_ops,
7927#if defined(CONFIG_NFS_V4_1)
7928 [1] = &nfs_v4_1_minor_ops,
7929#endif
7930#if defined(CONFIG_NFS_V4_2)
7931 [2] = &nfs_v4_2_minor_ops,
7932#endif
7933};
7934
7935static const struct inode_operations nfs4_dir_inode_operations = {
7936 .create = nfs_create,
7937 .lookup = nfs_lookup,
7938 .atomic_open = nfs_atomic_open,
7939 .link = nfs_link,
7940 .unlink = nfs_unlink,
7941 .symlink = nfs_symlink,
7942 .mkdir = nfs_mkdir,
7943 .rmdir = nfs_rmdir,
7944 .mknod = nfs_mknod,
7945 .rename = nfs_rename,
7946 .permission = nfs_permission,
7947 .getattr = nfs_getattr,
7948 .setattr = nfs_setattr,
7949 .getxattr = generic_getxattr,
7950 .setxattr = generic_setxattr,
7951 .listxattr = generic_listxattr,
7952 .removexattr = generic_removexattr,
7953};
7954
7955static const struct inode_operations nfs4_file_inode_operations = {
7956 .permission = nfs_permission,
7957 .getattr = nfs_getattr,
7958 .setattr = nfs_setattr,
7959 .getxattr = generic_getxattr,
7960 .setxattr = generic_setxattr,
7961 .listxattr = generic_listxattr,
7962 .removexattr = generic_removexattr,
7963};
7964
7965const struct nfs_rpc_ops nfs_v4_clientops = {
7966 .version = 4, /* protocol version */
7967 .dentry_ops = &nfs4_dentry_operations,
7968 .dir_inode_ops = &nfs4_dir_inode_operations,
7969 .file_inode_ops = &nfs4_file_inode_operations,
7970 .file_ops = &nfs4_file_operations,
7971 .getroot = nfs4_proc_get_root,
7972 .submount = nfs4_submount,
7973 .try_mount = nfs4_try_mount,
7974 .getattr = nfs4_proc_getattr,
7975 .setattr = nfs4_proc_setattr,
7976 .lookup = nfs4_proc_lookup,
7977 .access = nfs4_proc_access,
7978 .readlink = nfs4_proc_readlink,
7979 .create = nfs4_proc_create,
7980 .remove = nfs4_proc_remove,
7981 .unlink_setup = nfs4_proc_unlink_setup,
7982 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7983 .unlink_done = nfs4_proc_unlink_done,
7984 .rename = nfs4_proc_rename,
7985 .rename_setup = nfs4_proc_rename_setup,
7986 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7987 .rename_done = nfs4_proc_rename_done,
7988 .link = nfs4_proc_link,
7989 .symlink = nfs4_proc_symlink,
7990 .mkdir = nfs4_proc_mkdir,
7991 .rmdir = nfs4_proc_remove,
7992 .readdir = nfs4_proc_readdir,
7993 .mknod = nfs4_proc_mknod,
7994 .statfs = nfs4_proc_statfs,
7995 .fsinfo = nfs4_proc_fsinfo,
7996 .pathconf = nfs4_proc_pathconf,
7997 .set_capabilities = nfs4_server_capabilities,
7998 .decode_dirent = nfs4_decode_dirent,
7999 .read_setup = nfs4_proc_read_setup,
8000 .read_pageio_init = pnfs_pageio_init_read,
8001 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8002 .read_done = nfs4_read_done,
8003 .write_setup = nfs4_proc_write_setup,
8004 .write_pageio_init = pnfs_pageio_init_write,
8005 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8006 .write_done = nfs4_write_done,
8007 .commit_setup = nfs4_proc_commit_setup,
8008 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8009 .commit_done = nfs4_commit_done,
8010 .lock = nfs4_proc_lock,
8011 .clear_acl_cache = nfs4_zap_acl_attr,
8012 .close_context = nfs4_close_context,
8013 .open_context = nfs4_atomic_open,
8014 .have_delegation = nfs4_have_delegation,
8015 .return_delegation = nfs4_inode_return_delegation,
8016 .alloc_client = nfs4_alloc_client,
8017 .init_client = nfs4_init_client,
8018 .free_client = nfs4_free_client,
8019 .create_server = nfs4_create_server,
8020 .clone_server = nfs_clone_server,
8021};
8022
8023static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8024 .prefix = XATTR_NAME_NFSV4_ACL,
8025 .list = nfs4_xattr_list_nfs4_acl,
8026 .get = nfs4_xattr_get_nfs4_acl,
8027 .set = nfs4_xattr_set_nfs4_acl,
8028};
8029
8030const struct xattr_handler *nfs4_xattr_handlers[] = {
8031 &nfs4_xattr_nfs4_acl_handler,
8032#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8033 &nfs4_xattr_nfs4_label_handler,
8034#endif
8035 NULL
8036};
8037
8038/*
8039 * Local variables:
8040 * c-basic-offset: 8
8041 * End:
8042 */
Linux 6.x block layer and io_uring tree(s)