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NFSv4: Fix lock on-wire reordering issues
[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 *, long *);
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 err = security_dentry_init_security(dentry, sattr->ia_mode,
109 &dentry->d_name, (void **)&label->label, &label->len);
110 if (err == 0)
111 return label;
112
113 return NULL;
114}
115static inline void
116nfs4_label_release_security(struct nfs4_label *label)
117{
118 if (label)
119 security_release_secctx(label->label, label->len);
120}
121static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
122{
123 if (label)
124 return server->attr_bitmask;
125
126 return server->attr_bitmask_nl;
127}
128#else
129static inline struct nfs4_label *
130nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
131 struct iattr *sattr, struct nfs4_label *l)
132{ return NULL; }
133static inline void
134nfs4_label_release_security(struct nfs4_label *label)
135{ return; }
136static inline u32 *
137nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
138{ return server->attr_bitmask; }
139#endif
140
141/* Prevent leaks of NFSv4 errors into userland */
142static int nfs4_map_errors(int err)
143{
144 if (err >= -1000)
145 return err;
146 switch (err) {
147 case -NFS4ERR_RESOURCE:
148 case -NFS4ERR_LAYOUTTRYLATER:
149 case -NFS4ERR_RECALLCONFLICT:
150 return -EREMOTEIO;
151 case -NFS4ERR_WRONGSEC:
152 case -NFS4ERR_WRONG_CRED:
153 return -EPERM;
154 case -NFS4ERR_BADOWNER:
155 case -NFS4ERR_BADNAME:
156 return -EINVAL;
157 case -NFS4ERR_SHARE_DENIED:
158 return -EACCES;
159 case -NFS4ERR_MINOR_VERS_MISMATCH:
160 return -EPROTONOSUPPORT;
161 case -NFS4ERR_FILE_OPEN:
162 return -EBUSY;
163 default:
164 dprintk("%s could not handle NFSv4 error %d\n",
165 __func__, -err);
166 break;
167 }
168 return -EIO;
169}
170
171/*
172 * This is our standard bitmap for GETATTR requests.
173 */
174const u32 nfs4_fattr_bitmap[3] = {
175 FATTR4_WORD0_TYPE
176 | FATTR4_WORD0_CHANGE
177 | FATTR4_WORD0_SIZE
178 | FATTR4_WORD0_FSID
179 | FATTR4_WORD0_FILEID,
180 FATTR4_WORD1_MODE
181 | FATTR4_WORD1_NUMLINKS
182 | FATTR4_WORD1_OWNER
183 | FATTR4_WORD1_OWNER_GROUP
184 | FATTR4_WORD1_RAWDEV
185 | FATTR4_WORD1_SPACE_USED
186 | FATTR4_WORD1_TIME_ACCESS
187 | FATTR4_WORD1_TIME_METADATA
188 | FATTR4_WORD1_TIME_MODIFY,
189#ifdef CONFIG_NFS_V4_SECURITY_LABEL
190 FATTR4_WORD2_SECURITY_LABEL
191#endif
192};
193
194static const u32 nfs4_pnfs_open_bitmap[3] = {
195 FATTR4_WORD0_TYPE
196 | FATTR4_WORD0_CHANGE
197 | FATTR4_WORD0_SIZE
198 | FATTR4_WORD0_FSID
199 | FATTR4_WORD0_FILEID,
200 FATTR4_WORD1_MODE
201 | FATTR4_WORD1_NUMLINKS
202 | FATTR4_WORD1_OWNER
203 | FATTR4_WORD1_OWNER_GROUP
204 | FATTR4_WORD1_RAWDEV
205 | FATTR4_WORD1_SPACE_USED
206 | FATTR4_WORD1_TIME_ACCESS
207 | FATTR4_WORD1_TIME_METADATA
208 | FATTR4_WORD1_TIME_MODIFY,
209 FATTR4_WORD2_MDSTHRESHOLD
210};
211
212static const u32 nfs4_open_noattr_bitmap[3] = {
213 FATTR4_WORD0_TYPE
214 | FATTR4_WORD0_CHANGE
215 | FATTR4_WORD0_FILEID,
216};
217
218const u32 nfs4_statfs_bitmap[3] = {
219 FATTR4_WORD0_FILES_AVAIL
220 | FATTR4_WORD0_FILES_FREE
221 | FATTR4_WORD0_FILES_TOTAL,
222 FATTR4_WORD1_SPACE_AVAIL
223 | FATTR4_WORD1_SPACE_FREE
224 | FATTR4_WORD1_SPACE_TOTAL
225};
226
227const u32 nfs4_pathconf_bitmap[3] = {
228 FATTR4_WORD0_MAXLINK
229 | FATTR4_WORD0_MAXNAME,
230 0
231};
232
233const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
234 | FATTR4_WORD0_MAXREAD
235 | FATTR4_WORD0_MAXWRITE
236 | FATTR4_WORD0_LEASE_TIME,
237 FATTR4_WORD1_TIME_DELTA
238 | FATTR4_WORD1_FS_LAYOUT_TYPES,
239 FATTR4_WORD2_LAYOUT_BLKSIZE
240};
241
242const u32 nfs4_fs_locations_bitmap[3] = {
243 FATTR4_WORD0_TYPE
244 | FATTR4_WORD0_CHANGE
245 | FATTR4_WORD0_SIZE
246 | FATTR4_WORD0_FSID
247 | FATTR4_WORD0_FILEID
248 | FATTR4_WORD0_FS_LOCATIONS,
249 FATTR4_WORD1_MODE
250 | FATTR4_WORD1_NUMLINKS
251 | FATTR4_WORD1_OWNER
252 | FATTR4_WORD1_OWNER_GROUP
253 | FATTR4_WORD1_RAWDEV
254 | FATTR4_WORD1_SPACE_USED
255 | FATTR4_WORD1_TIME_ACCESS
256 | FATTR4_WORD1_TIME_METADATA
257 | FATTR4_WORD1_TIME_MODIFY
258 | FATTR4_WORD1_MOUNTED_ON_FILEID,
259};
260
261static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
262 struct nfs4_readdir_arg *readdir)
263{
264 __be32 *start, *p;
265
266 if (cookie > 2) {
267 readdir->cookie = cookie;
268 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
269 return;
270 }
271
272 readdir->cookie = 0;
273 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
274 if (cookie == 2)
275 return;
276
277 /*
278 * NFSv4 servers do not return entries for '.' and '..'
279 * Therefore, we fake these entries here. We let '.'
280 * have cookie 0 and '..' have cookie 1. Note that
281 * when talking to the server, we always send cookie 0
282 * instead of 1 or 2.
283 */
284 start = p = kmap_atomic(*readdir->pages);
285
286 if (cookie == 0) {
287 *p++ = xdr_one; /* next */
288 *p++ = xdr_zero; /* cookie, first word */
289 *p++ = xdr_one; /* cookie, second word */
290 *p++ = xdr_one; /* entry len */
291 memcpy(p, ".\0\0\0", 4); /* entry */
292 p++;
293 *p++ = xdr_one; /* bitmap length */
294 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
295 *p++ = htonl(8); /* attribute buffer length */
296 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
297 }
298
299 *p++ = xdr_one; /* next */
300 *p++ = xdr_zero; /* cookie, first word */
301 *p++ = xdr_two; /* cookie, second word */
302 *p++ = xdr_two; /* entry len */
303 memcpy(p, "..\0\0", 4); /* entry */
304 p++;
305 *p++ = xdr_one; /* bitmap length */
306 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
307 *p++ = htonl(8); /* attribute buffer length */
308 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
309
310 readdir->pgbase = (char *)p - (char *)start;
311 readdir->count -= readdir->pgbase;
312 kunmap_atomic(start);
313}
314
315static long nfs4_update_delay(long *timeout)
316{
317 long ret;
318 if (!timeout)
319 return NFS4_POLL_RETRY_MAX;
320 if (*timeout <= 0)
321 *timeout = NFS4_POLL_RETRY_MIN;
322 if (*timeout > NFS4_POLL_RETRY_MAX)
323 *timeout = NFS4_POLL_RETRY_MAX;
324 ret = *timeout;
325 *timeout <<= 1;
326 return ret;
327}
328
329static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
330{
331 int res = 0;
332
333 might_sleep();
334
335 freezable_schedule_timeout_killable_unsafe(
336 nfs4_update_delay(timeout));
337 if (fatal_signal_pending(current))
338 res = -ERESTARTSYS;
339 return res;
340}
341
342/* This is the error handling routine for processes that are allowed
343 * to sleep.
344 */
345int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
346{
347 struct nfs_client *clp = server->nfs_client;
348 struct nfs4_state *state = exception->state;
349 struct inode *inode = exception->inode;
350 int ret = errorcode;
351
352 exception->retry = 0;
353 switch(errorcode) {
354 case 0:
355 return 0;
356 case -NFS4ERR_OPENMODE:
357 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
358 nfs4_inode_return_delegation(inode);
359 exception->retry = 1;
360 return 0;
361 }
362 if (state == NULL)
363 break;
364 ret = nfs4_schedule_stateid_recovery(server, state);
365 if (ret < 0)
366 break;
367 goto wait_on_recovery;
368 case -NFS4ERR_DELEG_REVOKED:
369 case -NFS4ERR_ADMIN_REVOKED:
370 case -NFS4ERR_BAD_STATEID:
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 case -NFS4ERR_MOVED:
388 ret = nfs4_schedule_migration_recovery(server);
389 if (ret < 0)
390 break;
391 goto wait_on_recovery;
392 case -NFS4ERR_LEASE_MOVED:
393 nfs4_schedule_lease_moved_recovery(clp);
394 goto wait_on_recovery;
395#if defined(CONFIG_NFS_V4_1)
396 case -NFS4ERR_BADSESSION:
397 case -NFS4ERR_BADSLOT:
398 case -NFS4ERR_BAD_HIGH_SLOT:
399 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
400 case -NFS4ERR_DEADSESSION:
401 case -NFS4ERR_SEQ_FALSE_RETRY:
402 case -NFS4ERR_SEQ_MISORDERED:
403 dprintk("%s ERROR: %d Reset session\n", __func__,
404 errorcode);
405 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
406 goto wait_on_recovery;
407#endif /* defined(CONFIG_NFS_V4_1) */
408 case -NFS4ERR_FILE_OPEN:
409 if (exception->timeout > HZ) {
410 /* We have retried a decent amount, time to
411 * fail
412 */
413 ret = -EBUSY;
414 break;
415 }
416 case -NFS4ERR_GRACE:
417 case -NFS4ERR_DELAY:
418 ret = nfs4_delay(server->client, &exception->timeout);
419 if (ret != 0)
420 break;
421 case -NFS4ERR_RETRY_UNCACHED_REP:
422 case -NFS4ERR_OLD_STATEID:
423 exception->retry = 1;
424 break;
425 case -NFS4ERR_BADOWNER:
426 /* The following works around a Linux server bug! */
427 case -NFS4ERR_BADNAME:
428 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
429 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
430 exception->retry = 1;
431 printk(KERN_WARNING "NFS: v4 server %s "
432 "does not accept raw "
433 "uid/gids. "
434 "Reenabling the idmapper.\n",
435 server->nfs_client->cl_hostname);
436 }
437 }
438 /* We failed to handle the error */
439 return nfs4_map_errors(ret);
440wait_on_recovery:
441 ret = nfs4_wait_clnt_recover(clp);
442 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
443 return -EIO;
444 if (ret == 0)
445 exception->retry = 1;
446 return ret;
447}
448
449/*
450 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
451 * or 'false' otherwise.
452 */
453static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
454{
455 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
456
457 if (flavor == RPC_AUTH_GSS_KRB5I ||
458 flavor == RPC_AUTH_GSS_KRB5P)
459 return true;
460
461 return false;
462}
463
464static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
465{
466 spin_lock(&clp->cl_lock);
467 if (time_before(clp->cl_last_renewal,timestamp))
468 clp->cl_last_renewal = timestamp;
469 spin_unlock(&clp->cl_lock);
470}
471
472static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
473{
474 do_renew_lease(server->nfs_client, timestamp);
475}
476
477struct nfs4_call_sync_data {
478 const struct nfs_server *seq_server;
479 struct nfs4_sequence_args *seq_args;
480 struct nfs4_sequence_res *seq_res;
481};
482
483static void nfs4_init_sequence(struct nfs4_sequence_args *args,
484 struct nfs4_sequence_res *res, int cache_reply)
485{
486 args->sa_slot = NULL;
487 args->sa_cache_this = cache_reply;
488 args->sa_privileged = 0;
489
490 res->sr_slot = NULL;
491}
492
493static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
494{
495 args->sa_privileged = 1;
496}
497
498static int nfs40_setup_sequence(const struct nfs_server *server,
499 struct nfs4_sequence_args *args,
500 struct nfs4_sequence_res *res,
501 struct rpc_task *task)
502{
503 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
504 struct nfs4_slot *slot;
505
506 /* slot already allocated? */
507 if (res->sr_slot != NULL)
508 goto out_start;
509
510 spin_lock(&tbl->slot_tbl_lock);
511 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
512 goto out_sleep;
513
514 slot = nfs4_alloc_slot(tbl);
515 if (IS_ERR(slot)) {
516 if (slot == ERR_PTR(-ENOMEM))
517 task->tk_timeout = HZ >> 2;
518 goto out_sleep;
519 }
520 spin_unlock(&tbl->slot_tbl_lock);
521
522 args->sa_slot = slot;
523 res->sr_slot = slot;
524
525out_start:
526 rpc_call_start(task);
527 return 0;
528
529out_sleep:
530 if (args->sa_privileged)
531 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
532 NULL, RPC_PRIORITY_PRIVILEGED);
533 else
534 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
535 spin_unlock(&tbl->slot_tbl_lock);
536 return -EAGAIN;
537}
538
539static int nfs40_sequence_done(struct rpc_task *task,
540 struct nfs4_sequence_res *res)
541{
542 struct nfs4_slot *slot = res->sr_slot;
543 struct nfs4_slot_table *tbl;
544
545 if (slot == NULL)
546 goto out;
547
548 tbl = slot->table;
549 spin_lock(&tbl->slot_tbl_lock);
550 if (!nfs41_wake_and_assign_slot(tbl, slot))
551 nfs4_free_slot(tbl, slot);
552 spin_unlock(&tbl->slot_tbl_lock);
553
554 res->sr_slot = NULL;
555out:
556 return 1;
557}
558
559#if defined(CONFIG_NFS_V4_1)
560
561static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
562{
563 struct nfs4_session *session;
564 struct nfs4_slot_table *tbl;
565 struct nfs4_slot *slot = res->sr_slot;
566 bool send_new_highest_used_slotid = false;
567
568 tbl = slot->table;
569 session = tbl->session;
570
571 spin_lock(&tbl->slot_tbl_lock);
572 /* Be nice to the server: try to ensure that the last transmitted
573 * value for highest_user_slotid <= target_highest_slotid
574 */
575 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
576 send_new_highest_used_slotid = true;
577
578 if (nfs41_wake_and_assign_slot(tbl, slot)) {
579 send_new_highest_used_slotid = false;
580 goto out_unlock;
581 }
582 nfs4_free_slot(tbl, slot);
583
584 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
585 send_new_highest_used_slotid = false;
586out_unlock:
587 spin_unlock(&tbl->slot_tbl_lock);
588 res->sr_slot = NULL;
589 if (send_new_highest_used_slotid)
590 nfs41_server_notify_highest_slotid_update(session->clp);
591}
592
593int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
594{
595 struct nfs4_session *session;
596 struct nfs4_slot *slot = res->sr_slot;
597 struct nfs_client *clp;
598 bool interrupted = false;
599 int ret = 1;
600
601 if (slot == NULL)
602 goto out_noaction;
603 /* don't increment the sequence number if the task wasn't sent */
604 if (!RPC_WAS_SENT(task))
605 goto out;
606
607 session = slot->table->session;
608
609 if (slot->interrupted) {
610 slot->interrupted = 0;
611 interrupted = true;
612 }
613
614 trace_nfs4_sequence_done(session, res);
615 /* Check the SEQUENCE operation status */
616 switch (res->sr_status) {
617 case 0:
618 /* Update the slot's sequence and clientid lease timer */
619 ++slot->seq_nr;
620 clp = session->clp;
621 do_renew_lease(clp, res->sr_timestamp);
622 /* Check sequence flags */
623 if (res->sr_status_flags != 0)
624 nfs4_schedule_lease_recovery(clp);
625 nfs41_update_target_slotid(slot->table, slot, res);
626 break;
627 case 1:
628 /*
629 * sr_status remains 1 if an RPC level error occurred.
630 * The server may or may not have processed the sequence
631 * operation..
632 * Mark the slot as having hosted an interrupted RPC call.
633 */
634 slot->interrupted = 1;
635 goto out;
636 case -NFS4ERR_DELAY:
637 /* The server detected a resend of the RPC call and
638 * returned NFS4ERR_DELAY as per Section 2.10.6.2
639 * of RFC5661.
640 */
641 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
642 __func__,
643 slot->slot_nr,
644 slot->seq_nr);
645 goto out_retry;
646 case -NFS4ERR_BADSLOT:
647 /*
648 * The slot id we used was probably retired. Try again
649 * using a different slot id.
650 */
651 goto retry_nowait;
652 case -NFS4ERR_SEQ_MISORDERED:
653 /*
654 * Was the last operation on this sequence interrupted?
655 * If so, retry after bumping the sequence number.
656 */
657 if (interrupted) {
658 ++slot->seq_nr;
659 goto retry_nowait;
660 }
661 /*
662 * Could this slot have been previously retired?
663 * If so, then the server may be expecting seq_nr = 1!
664 */
665 if (slot->seq_nr != 1) {
666 slot->seq_nr = 1;
667 goto retry_nowait;
668 }
669 break;
670 case -NFS4ERR_SEQ_FALSE_RETRY:
671 ++slot->seq_nr;
672 goto retry_nowait;
673 default:
674 /* Just update the slot sequence no. */
675 ++slot->seq_nr;
676 }
677out:
678 /* The session may be reset by one of the error handlers. */
679 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
680 nfs41_sequence_free_slot(res);
681out_noaction:
682 return ret;
683retry_nowait:
684 if (rpc_restart_call_prepare(task)) {
685 task->tk_status = 0;
686 ret = 0;
687 }
688 goto out;
689out_retry:
690 if (!rpc_restart_call(task))
691 goto out;
692 rpc_delay(task, NFS4_POLL_RETRY_MAX);
693 return 0;
694}
695EXPORT_SYMBOL_GPL(nfs41_sequence_done);
696
697static int nfs4_sequence_done(struct rpc_task *task,
698 struct nfs4_sequence_res *res)
699{
700 if (res->sr_slot == NULL)
701 return 1;
702 if (!res->sr_slot->table->session)
703 return nfs40_sequence_done(task, res);
704 return nfs41_sequence_done(task, res);
705}
706
707int nfs41_setup_sequence(struct nfs4_session *session,
708 struct nfs4_sequence_args *args,
709 struct nfs4_sequence_res *res,
710 struct rpc_task *task)
711{
712 struct nfs4_slot *slot;
713 struct nfs4_slot_table *tbl;
714
715 dprintk("--> %s\n", __func__);
716 /* slot already allocated? */
717 if (res->sr_slot != NULL)
718 goto out_success;
719
720 tbl = &session->fc_slot_table;
721
722 task->tk_timeout = 0;
723
724 spin_lock(&tbl->slot_tbl_lock);
725 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
726 !args->sa_privileged) {
727 /* The state manager will wait until the slot table is empty */
728 dprintk("%s session is draining\n", __func__);
729 goto out_sleep;
730 }
731
732 slot = nfs4_alloc_slot(tbl);
733 if (IS_ERR(slot)) {
734 /* If out of memory, try again in 1/4 second */
735 if (slot == ERR_PTR(-ENOMEM))
736 task->tk_timeout = HZ >> 2;
737 dprintk("<-- %s: no free slots\n", __func__);
738 goto out_sleep;
739 }
740 spin_unlock(&tbl->slot_tbl_lock);
741
742 args->sa_slot = slot;
743
744 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
745 slot->slot_nr, slot->seq_nr);
746
747 res->sr_slot = slot;
748 res->sr_timestamp = jiffies;
749 res->sr_status_flags = 0;
750 /*
751 * sr_status is only set in decode_sequence, and so will remain
752 * set to 1 if an rpc level failure occurs.
753 */
754 res->sr_status = 1;
755 trace_nfs4_setup_sequence(session, args);
756out_success:
757 rpc_call_start(task);
758 return 0;
759out_sleep:
760 /* Privileged tasks are queued with top priority */
761 if (args->sa_privileged)
762 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
763 NULL, RPC_PRIORITY_PRIVILEGED);
764 else
765 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
766 spin_unlock(&tbl->slot_tbl_lock);
767 return -EAGAIN;
768}
769EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
770
771static int nfs4_setup_sequence(const struct nfs_server *server,
772 struct nfs4_sequence_args *args,
773 struct nfs4_sequence_res *res,
774 struct rpc_task *task)
775{
776 struct nfs4_session *session = nfs4_get_session(server);
777 int ret = 0;
778
779 if (!session)
780 return nfs40_setup_sequence(server, args, res, task);
781
782 dprintk("--> %s clp %p session %p sr_slot %u\n",
783 __func__, session->clp, session, res->sr_slot ?
784 res->sr_slot->slot_nr : NFS4_NO_SLOT);
785
786 ret = nfs41_setup_sequence(session, args, res, task);
787
788 dprintk("<-- %s status=%d\n", __func__, ret);
789 return ret;
790}
791
792static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
793{
794 struct nfs4_call_sync_data *data = calldata;
795 struct nfs4_session *session = nfs4_get_session(data->seq_server);
796
797 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
798
799 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
800}
801
802static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
803{
804 struct nfs4_call_sync_data *data = calldata;
805
806 nfs41_sequence_done(task, data->seq_res);
807}
808
809static const struct rpc_call_ops nfs41_call_sync_ops = {
810 .rpc_call_prepare = nfs41_call_sync_prepare,
811 .rpc_call_done = nfs41_call_sync_done,
812};
813
814#else /* !CONFIG_NFS_V4_1 */
815
816static int nfs4_setup_sequence(const struct nfs_server *server,
817 struct nfs4_sequence_args *args,
818 struct nfs4_sequence_res *res,
819 struct rpc_task *task)
820{
821 return nfs40_setup_sequence(server, args, res, task);
822}
823
824static int nfs4_sequence_done(struct rpc_task *task,
825 struct nfs4_sequence_res *res)
826{
827 return nfs40_sequence_done(task, res);
828}
829
830#endif /* !CONFIG_NFS_V4_1 */
831
832static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
833{
834 struct nfs4_call_sync_data *data = calldata;
835 nfs4_setup_sequence(data->seq_server,
836 data->seq_args, data->seq_res, task);
837}
838
839static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
840{
841 struct nfs4_call_sync_data *data = calldata;
842 nfs4_sequence_done(task, data->seq_res);
843}
844
845static const struct rpc_call_ops nfs40_call_sync_ops = {
846 .rpc_call_prepare = nfs40_call_sync_prepare,
847 .rpc_call_done = nfs40_call_sync_done,
848};
849
850static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
851 struct nfs_server *server,
852 struct rpc_message *msg,
853 struct nfs4_sequence_args *args,
854 struct nfs4_sequence_res *res)
855{
856 int ret;
857 struct rpc_task *task;
858 struct nfs_client *clp = server->nfs_client;
859 struct nfs4_call_sync_data data = {
860 .seq_server = server,
861 .seq_args = args,
862 .seq_res = res,
863 };
864 struct rpc_task_setup task_setup = {
865 .rpc_client = clnt,
866 .rpc_message = msg,
867 .callback_ops = clp->cl_mvops->call_sync_ops,
868 .callback_data = &data
869 };
870
871 task = rpc_run_task(&task_setup);
872 if (IS_ERR(task))
873 ret = PTR_ERR(task);
874 else {
875 ret = task->tk_status;
876 rpc_put_task(task);
877 }
878 return ret;
879}
880
881int nfs4_call_sync(struct rpc_clnt *clnt,
882 struct nfs_server *server,
883 struct rpc_message *msg,
884 struct nfs4_sequence_args *args,
885 struct nfs4_sequence_res *res,
886 int cache_reply)
887{
888 nfs4_init_sequence(args, res, cache_reply);
889 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
890}
891
892static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
893{
894 struct nfs_inode *nfsi = NFS_I(dir);
895
896 spin_lock(&dir->i_lock);
897 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
898 if (!cinfo->atomic || cinfo->before != dir->i_version)
899 nfs_force_lookup_revalidate(dir);
900 dir->i_version = cinfo->after;
901 nfs_fscache_invalidate(dir);
902 spin_unlock(&dir->i_lock);
903}
904
905struct nfs4_opendata {
906 struct kref kref;
907 struct nfs_openargs o_arg;
908 struct nfs_openres o_res;
909 struct nfs_open_confirmargs c_arg;
910 struct nfs_open_confirmres c_res;
911 struct nfs4_string owner_name;
912 struct nfs4_string group_name;
913 struct nfs_fattr f_attr;
914 struct nfs4_label *f_label;
915 struct dentry *dir;
916 struct dentry *dentry;
917 struct nfs4_state_owner *owner;
918 struct nfs4_state *state;
919 struct iattr attrs;
920 unsigned long timestamp;
921 unsigned int rpc_done : 1;
922 unsigned int file_created : 1;
923 unsigned int is_recover : 1;
924 int rpc_status;
925 int cancelled;
926};
927
928static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
929 int err, struct nfs4_exception *exception)
930{
931 if (err != -EINVAL)
932 return false;
933 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
934 return false;
935 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
936 exception->retry = 1;
937 return true;
938}
939
940static enum open_claim_type4
941nfs4_map_atomic_open_claim(struct nfs_server *server,
942 enum open_claim_type4 claim)
943{
944 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
945 return claim;
946 switch (claim) {
947 default:
948 return claim;
949 case NFS4_OPEN_CLAIM_FH:
950 return NFS4_OPEN_CLAIM_NULL;
951 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
952 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
953 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
954 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
955 }
956}
957
958static void nfs4_init_opendata_res(struct nfs4_opendata *p)
959{
960 p->o_res.f_attr = &p->f_attr;
961 p->o_res.f_label = p->f_label;
962 p->o_res.seqid = p->o_arg.seqid;
963 p->c_res.seqid = p->c_arg.seqid;
964 p->o_res.server = p->o_arg.server;
965 p->o_res.access_request = p->o_arg.access;
966 nfs_fattr_init(&p->f_attr);
967 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
968}
969
970static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
971 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
972 const struct iattr *attrs,
973 struct nfs4_label *label,
974 enum open_claim_type4 claim,
975 gfp_t gfp_mask)
976{
977 struct dentry *parent = dget_parent(dentry);
978 struct inode *dir = parent->d_inode;
979 struct nfs_server *server = NFS_SERVER(dir);
980 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
981 struct nfs4_opendata *p;
982
983 p = kzalloc(sizeof(*p), gfp_mask);
984 if (p == NULL)
985 goto err;
986
987 p->f_label = nfs4_label_alloc(server, gfp_mask);
988 if (IS_ERR(p->f_label))
989 goto err_free_p;
990
991 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
992 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
993 if (IS_ERR(p->o_arg.seqid))
994 goto err_free_label;
995 nfs_sb_active(dentry->d_sb);
996 p->dentry = dget(dentry);
997 p->dir = parent;
998 p->owner = sp;
999 atomic_inc(&sp->so_count);
1000 p->o_arg.open_flags = flags;
1001 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1002 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1003 * will return permission denied for all bits until close */
1004 if (!(flags & O_EXCL)) {
1005 /* ask server to check for all possible rights as results
1006 * are cached */
1007 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1008 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1009 }
1010 p->o_arg.clientid = server->nfs_client->cl_clientid;
1011 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1012 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1013 p->o_arg.name = &dentry->d_name;
1014 p->o_arg.server = server;
1015 p->o_arg.bitmask = nfs4_bitmask(server, label);
1016 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1017 p->o_arg.label = label;
1018 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1019 switch (p->o_arg.claim) {
1020 case NFS4_OPEN_CLAIM_NULL:
1021 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1022 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1023 p->o_arg.fh = NFS_FH(dir);
1024 break;
1025 case NFS4_OPEN_CLAIM_PREVIOUS:
1026 case NFS4_OPEN_CLAIM_FH:
1027 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1028 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1029 p->o_arg.fh = NFS_FH(dentry->d_inode);
1030 }
1031 if (attrs != NULL && attrs->ia_valid != 0) {
1032 __u32 verf[2];
1033
1034 p->o_arg.u.attrs = &p->attrs;
1035 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1036
1037 verf[0] = jiffies;
1038 verf[1] = current->pid;
1039 memcpy(p->o_arg.u.verifier.data, verf,
1040 sizeof(p->o_arg.u.verifier.data));
1041 }
1042 p->c_arg.fh = &p->o_res.fh;
1043 p->c_arg.stateid = &p->o_res.stateid;
1044 p->c_arg.seqid = p->o_arg.seqid;
1045 nfs4_init_opendata_res(p);
1046 kref_init(&p->kref);
1047 return p;
1048
1049err_free_label:
1050 nfs4_label_free(p->f_label);
1051err_free_p:
1052 kfree(p);
1053err:
1054 dput(parent);
1055 return NULL;
1056}
1057
1058static void nfs4_opendata_free(struct kref *kref)
1059{
1060 struct nfs4_opendata *p = container_of(kref,
1061 struct nfs4_opendata, kref);
1062 struct super_block *sb = p->dentry->d_sb;
1063
1064 nfs_free_seqid(p->o_arg.seqid);
1065 if (p->state != NULL)
1066 nfs4_put_open_state(p->state);
1067 nfs4_put_state_owner(p->owner);
1068
1069 nfs4_label_free(p->f_label);
1070
1071 dput(p->dir);
1072 dput(p->dentry);
1073 nfs_sb_deactive(sb);
1074 nfs_fattr_free_names(&p->f_attr);
1075 kfree(p->f_attr.mdsthreshold);
1076 kfree(p);
1077}
1078
1079static void nfs4_opendata_put(struct nfs4_opendata *p)
1080{
1081 if (p != NULL)
1082 kref_put(&p->kref, nfs4_opendata_free);
1083}
1084
1085static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1086{
1087 int ret;
1088
1089 ret = rpc_wait_for_completion_task(task);
1090 return ret;
1091}
1092
1093static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1094{
1095 int ret = 0;
1096
1097 if (open_mode & (O_EXCL|O_TRUNC))
1098 goto out;
1099 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1100 case FMODE_READ:
1101 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1102 && state->n_rdonly != 0;
1103 break;
1104 case FMODE_WRITE:
1105 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1106 && state->n_wronly != 0;
1107 break;
1108 case FMODE_READ|FMODE_WRITE:
1109 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1110 && state->n_rdwr != 0;
1111 }
1112out:
1113 return ret;
1114}
1115
1116static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1117{
1118 if (delegation == NULL)
1119 return 0;
1120 if ((delegation->type & fmode) != fmode)
1121 return 0;
1122 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1123 return 0;
1124 nfs_mark_delegation_referenced(delegation);
1125 return 1;
1126}
1127
1128static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1129{
1130 switch (fmode) {
1131 case FMODE_WRITE:
1132 state->n_wronly++;
1133 break;
1134 case FMODE_READ:
1135 state->n_rdonly++;
1136 break;
1137 case FMODE_READ|FMODE_WRITE:
1138 state->n_rdwr++;
1139 }
1140 nfs4_state_set_mode_locked(state, state->state | fmode);
1141}
1142
1143static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1144{
1145 struct nfs_client *clp = state->owner->so_server->nfs_client;
1146 bool need_recover = false;
1147
1148 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1149 need_recover = true;
1150 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1151 need_recover = true;
1152 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1153 need_recover = true;
1154 if (need_recover)
1155 nfs4_state_mark_reclaim_nograce(clp, state);
1156}
1157
1158static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1159 nfs4_stateid *stateid)
1160{
1161 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1162 return true;
1163 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1164 nfs_test_and_clear_all_open_stateid(state);
1165 return true;
1166 }
1167 if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1168 return true;
1169 return false;
1170}
1171
1172static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1173{
1174 if (state->n_wronly)
1175 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1176 if (state->n_rdonly)
1177 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1178 if (state->n_rdwr)
1179 set_bit(NFS_O_RDWR_STATE, &state->flags);
1180}
1181
1182static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1183 nfs4_stateid *stateid, fmode_t fmode)
1184{
1185 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1186 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1187 case FMODE_WRITE:
1188 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1189 break;
1190 case FMODE_READ:
1191 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1192 break;
1193 case 0:
1194 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1195 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1196 clear_bit(NFS_OPEN_STATE, &state->flags);
1197 }
1198 if (stateid == NULL)
1199 return;
1200 /* Handle races with OPEN */
1201 if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1202 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1203 nfs_resync_open_stateid_locked(state);
1204 return;
1205 }
1206 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1207 nfs4_stateid_copy(&state->stateid, stateid);
1208 nfs4_stateid_copy(&state->open_stateid, stateid);
1209}
1210
1211static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1212{
1213 write_seqlock(&state->seqlock);
1214 nfs_clear_open_stateid_locked(state, stateid, fmode);
1215 write_sequnlock(&state->seqlock);
1216 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1217 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1218}
1219
1220static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1221{
1222 switch (fmode) {
1223 case FMODE_READ:
1224 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1225 break;
1226 case FMODE_WRITE:
1227 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1228 break;
1229 case FMODE_READ|FMODE_WRITE:
1230 set_bit(NFS_O_RDWR_STATE, &state->flags);
1231 }
1232 if (!nfs_need_update_open_stateid(state, stateid))
1233 return;
1234 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1235 nfs4_stateid_copy(&state->stateid, stateid);
1236 nfs4_stateid_copy(&state->open_stateid, stateid);
1237}
1238
1239static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1240{
1241 /*
1242 * Protect the call to nfs4_state_set_mode_locked and
1243 * serialise the stateid update
1244 */
1245 write_seqlock(&state->seqlock);
1246 if (deleg_stateid != NULL) {
1247 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1248 set_bit(NFS_DELEGATED_STATE, &state->flags);
1249 }
1250 if (open_stateid != NULL)
1251 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1252 write_sequnlock(&state->seqlock);
1253 spin_lock(&state->owner->so_lock);
1254 update_open_stateflags(state, fmode);
1255 spin_unlock(&state->owner->so_lock);
1256}
1257
1258static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1259{
1260 struct nfs_inode *nfsi = NFS_I(state->inode);
1261 struct nfs_delegation *deleg_cur;
1262 int ret = 0;
1263
1264 fmode &= (FMODE_READ|FMODE_WRITE);
1265
1266 rcu_read_lock();
1267 deleg_cur = rcu_dereference(nfsi->delegation);
1268 if (deleg_cur == NULL)
1269 goto no_delegation;
1270
1271 spin_lock(&deleg_cur->lock);
1272 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1273 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1274 (deleg_cur->type & fmode) != fmode)
1275 goto no_delegation_unlock;
1276
1277 if (delegation == NULL)
1278 delegation = &deleg_cur->stateid;
1279 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1280 goto no_delegation_unlock;
1281
1282 nfs_mark_delegation_referenced(deleg_cur);
1283 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1284 ret = 1;
1285no_delegation_unlock:
1286 spin_unlock(&deleg_cur->lock);
1287no_delegation:
1288 rcu_read_unlock();
1289
1290 if (!ret && open_stateid != NULL) {
1291 __update_open_stateid(state, open_stateid, NULL, fmode);
1292 ret = 1;
1293 }
1294 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1295 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1296
1297 return ret;
1298}
1299
1300static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1301 const nfs4_stateid *stateid)
1302{
1303 struct nfs4_state *state = lsp->ls_state;
1304 bool ret = false;
1305
1306 spin_lock(&state->state_lock);
1307 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1308 goto out_noupdate;
1309 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1310 goto out_noupdate;
1311 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1312 ret = true;
1313out_noupdate:
1314 spin_unlock(&state->state_lock);
1315 return ret;
1316}
1317
1318static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1319{
1320 struct nfs_delegation *delegation;
1321
1322 rcu_read_lock();
1323 delegation = rcu_dereference(NFS_I(inode)->delegation);
1324 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1325 rcu_read_unlock();
1326 return;
1327 }
1328 rcu_read_unlock();
1329 nfs4_inode_return_delegation(inode);
1330}
1331
1332static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1333{
1334 struct nfs4_state *state = opendata->state;
1335 struct nfs_inode *nfsi = NFS_I(state->inode);
1336 struct nfs_delegation *delegation;
1337 int open_mode = opendata->o_arg.open_flags;
1338 fmode_t fmode = opendata->o_arg.fmode;
1339 nfs4_stateid stateid;
1340 int ret = -EAGAIN;
1341
1342 for (;;) {
1343 spin_lock(&state->owner->so_lock);
1344 if (can_open_cached(state, fmode, open_mode)) {
1345 update_open_stateflags(state, fmode);
1346 spin_unlock(&state->owner->so_lock);
1347 goto out_return_state;
1348 }
1349 spin_unlock(&state->owner->so_lock);
1350 rcu_read_lock();
1351 delegation = rcu_dereference(nfsi->delegation);
1352 if (!can_open_delegated(delegation, fmode)) {
1353 rcu_read_unlock();
1354 break;
1355 }
1356 /* Save the delegation */
1357 nfs4_stateid_copy(&stateid, &delegation->stateid);
1358 rcu_read_unlock();
1359 nfs_release_seqid(opendata->o_arg.seqid);
1360 if (!opendata->is_recover) {
1361 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1362 if (ret != 0)
1363 goto out;
1364 }
1365 ret = -EAGAIN;
1366
1367 /* Try to update the stateid using the delegation */
1368 if (update_open_stateid(state, NULL, &stateid, fmode))
1369 goto out_return_state;
1370 }
1371out:
1372 return ERR_PTR(ret);
1373out_return_state:
1374 atomic_inc(&state->count);
1375 return state;
1376}
1377
1378static void
1379nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1380{
1381 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1382 struct nfs_delegation *delegation;
1383 int delegation_flags = 0;
1384
1385 rcu_read_lock();
1386 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1387 if (delegation)
1388 delegation_flags = delegation->flags;
1389 rcu_read_unlock();
1390 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1391 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1392 "returning a delegation for "
1393 "OPEN(CLAIM_DELEGATE_CUR)\n",
1394 clp->cl_hostname);
1395 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1396 nfs_inode_set_delegation(state->inode,
1397 data->owner->so_cred,
1398 &data->o_res);
1399 else
1400 nfs_inode_reclaim_delegation(state->inode,
1401 data->owner->so_cred,
1402 &data->o_res);
1403}
1404
1405/*
1406 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1407 * and update the nfs4_state.
1408 */
1409static struct nfs4_state *
1410_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1411{
1412 struct inode *inode = data->state->inode;
1413 struct nfs4_state *state = data->state;
1414 int ret;
1415
1416 if (!data->rpc_done) {
1417 if (data->rpc_status) {
1418 ret = data->rpc_status;
1419 goto err;
1420 }
1421 /* cached opens have already been processed */
1422 goto update;
1423 }
1424
1425 ret = nfs_refresh_inode(inode, &data->f_attr);
1426 if (ret)
1427 goto err;
1428
1429 if (data->o_res.delegation_type != 0)
1430 nfs4_opendata_check_deleg(data, state);
1431update:
1432 update_open_stateid(state, &data->o_res.stateid, NULL,
1433 data->o_arg.fmode);
1434 atomic_inc(&state->count);
1435
1436 return state;
1437err:
1438 return ERR_PTR(ret);
1439
1440}
1441
1442static struct nfs4_state *
1443_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1444{
1445 struct inode *inode;
1446 struct nfs4_state *state = NULL;
1447 int ret;
1448
1449 if (!data->rpc_done) {
1450 state = nfs4_try_open_cached(data);
1451 goto out;
1452 }
1453
1454 ret = -EAGAIN;
1455 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1456 goto err;
1457 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1458 ret = PTR_ERR(inode);
1459 if (IS_ERR(inode))
1460 goto err;
1461 ret = -ENOMEM;
1462 state = nfs4_get_open_state(inode, data->owner);
1463 if (state == NULL)
1464 goto err_put_inode;
1465 if (data->o_res.delegation_type != 0)
1466 nfs4_opendata_check_deleg(data, state);
1467 update_open_stateid(state, &data->o_res.stateid, NULL,
1468 data->o_arg.fmode);
1469 iput(inode);
1470out:
1471 nfs_release_seqid(data->o_arg.seqid);
1472 return state;
1473err_put_inode:
1474 iput(inode);
1475err:
1476 return ERR_PTR(ret);
1477}
1478
1479static struct nfs4_state *
1480nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1481{
1482 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1483 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1484 return _nfs4_opendata_to_nfs4_state(data);
1485}
1486
1487static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1488{
1489 struct nfs_inode *nfsi = NFS_I(state->inode);
1490 struct nfs_open_context *ctx;
1491
1492 spin_lock(&state->inode->i_lock);
1493 list_for_each_entry(ctx, &nfsi->open_files, list) {
1494 if (ctx->state != state)
1495 continue;
1496 get_nfs_open_context(ctx);
1497 spin_unlock(&state->inode->i_lock);
1498 return ctx;
1499 }
1500 spin_unlock(&state->inode->i_lock);
1501 return ERR_PTR(-ENOENT);
1502}
1503
1504static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1505 struct nfs4_state *state, enum open_claim_type4 claim)
1506{
1507 struct nfs4_opendata *opendata;
1508
1509 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1510 NULL, NULL, claim, GFP_NOFS);
1511 if (opendata == NULL)
1512 return ERR_PTR(-ENOMEM);
1513 opendata->state = state;
1514 atomic_inc(&state->count);
1515 return opendata;
1516}
1517
1518static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1519{
1520 struct nfs4_state *newstate;
1521 int ret;
1522
1523 opendata->o_arg.open_flags = 0;
1524 opendata->o_arg.fmode = fmode;
1525 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1526 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1527 nfs4_init_opendata_res(opendata);
1528 ret = _nfs4_recover_proc_open(opendata);
1529 if (ret != 0)
1530 return ret;
1531 newstate = nfs4_opendata_to_nfs4_state(opendata);
1532 if (IS_ERR(newstate))
1533 return PTR_ERR(newstate);
1534 nfs4_close_state(newstate, fmode);
1535 *res = newstate;
1536 return 0;
1537}
1538
1539static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1540{
1541 struct nfs4_state *newstate;
1542 int ret;
1543
1544 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1545 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1546 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1547 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1548 /* memory barrier prior to reading state->n_* */
1549 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1550 clear_bit(NFS_OPEN_STATE, &state->flags);
1551 smp_rmb();
1552 if (state->n_rdwr != 0) {
1553 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1554 if (ret != 0)
1555 return ret;
1556 if (newstate != state)
1557 return -ESTALE;
1558 }
1559 if (state->n_wronly != 0) {
1560 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1561 if (ret != 0)
1562 return ret;
1563 if (newstate != state)
1564 return -ESTALE;
1565 }
1566 if (state->n_rdonly != 0) {
1567 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1568 if (ret != 0)
1569 return ret;
1570 if (newstate != state)
1571 return -ESTALE;
1572 }
1573 /*
1574 * We may have performed cached opens for all three recoveries.
1575 * Check if we need to update the current stateid.
1576 */
1577 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1578 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1579 write_seqlock(&state->seqlock);
1580 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1581 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1582 write_sequnlock(&state->seqlock);
1583 }
1584 return 0;
1585}
1586
1587/*
1588 * OPEN_RECLAIM:
1589 * reclaim state on the server after a reboot.
1590 */
1591static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1592{
1593 struct nfs_delegation *delegation;
1594 struct nfs4_opendata *opendata;
1595 fmode_t delegation_type = 0;
1596 int status;
1597
1598 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1599 NFS4_OPEN_CLAIM_PREVIOUS);
1600 if (IS_ERR(opendata))
1601 return PTR_ERR(opendata);
1602 rcu_read_lock();
1603 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1604 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1605 delegation_type = delegation->type;
1606 rcu_read_unlock();
1607 opendata->o_arg.u.delegation_type = delegation_type;
1608 status = nfs4_open_recover(opendata, state);
1609 nfs4_opendata_put(opendata);
1610 return status;
1611}
1612
1613static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1614{
1615 struct nfs_server *server = NFS_SERVER(state->inode);
1616 struct nfs4_exception exception = { };
1617 int err;
1618 do {
1619 err = _nfs4_do_open_reclaim(ctx, state);
1620 trace_nfs4_open_reclaim(ctx, 0, err);
1621 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1622 continue;
1623 if (err != -NFS4ERR_DELAY)
1624 break;
1625 nfs4_handle_exception(server, err, &exception);
1626 } while (exception.retry);
1627 return err;
1628}
1629
1630static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1631{
1632 struct nfs_open_context *ctx;
1633 int ret;
1634
1635 ctx = nfs4_state_find_open_context(state);
1636 if (IS_ERR(ctx))
1637 return -EAGAIN;
1638 ret = nfs4_do_open_reclaim(ctx, state);
1639 put_nfs_open_context(ctx);
1640 return ret;
1641}
1642
1643static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1644{
1645 switch (err) {
1646 default:
1647 printk(KERN_ERR "NFS: %s: unhandled error "
1648 "%d.\n", __func__, err);
1649 case 0:
1650 case -ENOENT:
1651 case -ESTALE:
1652 break;
1653 case -NFS4ERR_BADSESSION:
1654 case -NFS4ERR_BADSLOT:
1655 case -NFS4ERR_BAD_HIGH_SLOT:
1656 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1657 case -NFS4ERR_DEADSESSION:
1658 set_bit(NFS_DELEGATED_STATE, &state->flags);
1659 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1660 return -EAGAIN;
1661 case -NFS4ERR_STALE_CLIENTID:
1662 case -NFS4ERR_STALE_STATEID:
1663 set_bit(NFS_DELEGATED_STATE, &state->flags);
1664 case -NFS4ERR_EXPIRED:
1665 /* Don't recall a delegation if it was lost */
1666 nfs4_schedule_lease_recovery(server->nfs_client);
1667 return -EAGAIN;
1668 case -NFS4ERR_MOVED:
1669 nfs4_schedule_migration_recovery(server);
1670 return -EAGAIN;
1671 case -NFS4ERR_LEASE_MOVED:
1672 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1673 return -EAGAIN;
1674 case -NFS4ERR_DELEG_REVOKED:
1675 case -NFS4ERR_ADMIN_REVOKED:
1676 case -NFS4ERR_BAD_STATEID:
1677 case -NFS4ERR_OPENMODE:
1678 nfs_inode_find_state_and_recover(state->inode,
1679 stateid);
1680 nfs4_schedule_stateid_recovery(server, state);
1681 return -EAGAIN;
1682 case -NFS4ERR_DELAY:
1683 case -NFS4ERR_GRACE:
1684 set_bit(NFS_DELEGATED_STATE, &state->flags);
1685 ssleep(1);
1686 return -EAGAIN;
1687 case -ENOMEM:
1688 case -NFS4ERR_DENIED:
1689 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1690 return 0;
1691 }
1692 return err;
1693}
1694
1695int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1696{
1697 struct nfs_server *server = NFS_SERVER(state->inode);
1698 struct nfs4_opendata *opendata;
1699 int err;
1700
1701 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1702 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1703 if (IS_ERR(opendata))
1704 return PTR_ERR(opendata);
1705 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1706 err = nfs4_open_recover(opendata, state);
1707 nfs4_opendata_put(opendata);
1708 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1709}
1710
1711static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1712{
1713 struct nfs4_opendata *data = calldata;
1714
1715 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1716 &data->c_res.seq_res, task);
1717}
1718
1719static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1720{
1721 struct nfs4_opendata *data = calldata;
1722
1723 nfs40_sequence_done(task, &data->c_res.seq_res);
1724
1725 data->rpc_status = task->tk_status;
1726 if (data->rpc_status == 0) {
1727 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1728 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1729 renew_lease(data->o_res.server, data->timestamp);
1730 data->rpc_done = 1;
1731 }
1732}
1733
1734static void nfs4_open_confirm_release(void *calldata)
1735{
1736 struct nfs4_opendata *data = calldata;
1737 struct nfs4_state *state = NULL;
1738
1739 /* If this request hasn't been cancelled, do nothing */
1740 if (data->cancelled == 0)
1741 goto out_free;
1742 /* In case of error, no cleanup! */
1743 if (!data->rpc_done)
1744 goto out_free;
1745 state = nfs4_opendata_to_nfs4_state(data);
1746 if (!IS_ERR(state))
1747 nfs4_close_state(state, data->o_arg.fmode);
1748out_free:
1749 nfs4_opendata_put(data);
1750}
1751
1752static const struct rpc_call_ops nfs4_open_confirm_ops = {
1753 .rpc_call_prepare = nfs4_open_confirm_prepare,
1754 .rpc_call_done = nfs4_open_confirm_done,
1755 .rpc_release = nfs4_open_confirm_release,
1756};
1757
1758/*
1759 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1760 */
1761static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1762{
1763 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1764 struct rpc_task *task;
1765 struct rpc_message msg = {
1766 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1767 .rpc_argp = &data->c_arg,
1768 .rpc_resp = &data->c_res,
1769 .rpc_cred = data->owner->so_cred,
1770 };
1771 struct rpc_task_setup task_setup_data = {
1772 .rpc_client = server->client,
1773 .rpc_message = &msg,
1774 .callback_ops = &nfs4_open_confirm_ops,
1775 .callback_data = data,
1776 .workqueue = nfsiod_workqueue,
1777 .flags = RPC_TASK_ASYNC,
1778 };
1779 int status;
1780
1781 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1782 kref_get(&data->kref);
1783 data->rpc_done = 0;
1784 data->rpc_status = 0;
1785 data->timestamp = jiffies;
1786 task = rpc_run_task(&task_setup_data);
1787 if (IS_ERR(task))
1788 return PTR_ERR(task);
1789 status = nfs4_wait_for_completion_rpc_task(task);
1790 if (status != 0) {
1791 data->cancelled = 1;
1792 smp_wmb();
1793 } else
1794 status = data->rpc_status;
1795 rpc_put_task(task);
1796 return status;
1797}
1798
1799static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1800{
1801 struct nfs4_opendata *data = calldata;
1802 struct nfs4_state_owner *sp = data->owner;
1803 struct nfs_client *clp = sp->so_server->nfs_client;
1804
1805 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1806 goto out_wait;
1807 /*
1808 * Check if we still need to send an OPEN call, or if we can use
1809 * a delegation instead.
1810 */
1811 if (data->state != NULL) {
1812 struct nfs_delegation *delegation;
1813
1814 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1815 goto out_no_action;
1816 rcu_read_lock();
1817 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1818 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1819 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1820 can_open_delegated(delegation, data->o_arg.fmode))
1821 goto unlock_no_action;
1822 rcu_read_unlock();
1823 }
1824 /* Update client id. */
1825 data->o_arg.clientid = clp->cl_clientid;
1826 switch (data->o_arg.claim) {
1827 case NFS4_OPEN_CLAIM_PREVIOUS:
1828 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1829 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1830 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1831 case NFS4_OPEN_CLAIM_FH:
1832 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1833 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1834 }
1835 data->timestamp = jiffies;
1836 if (nfs4_setup_sequence(data->o_arg.server,
1837 &data->o_arg.seq_args,
1838 &data->o_res.seq_res,
1839 task) != 0)
1840 nfs_release_seqid(data->o_arg.seqid);
1841
1842 /* Set the create mode (note dependency on the session type) */
1843 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1844 if (data->o_arg.open_flags & O_EXCL) {
1845 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1846 if (nfs4_has_persistent_session(clp))
1847 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1848 else if (clp->cl_mvops->minor_version > 0)
1849 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1850 }
1851 return;
1852unlock_no_action:
1853 rcu_read_unlock();
1854out_no_action:
1855 task->tk_action = NULL;
1856out_wait:
1857 nfs4_sequence_done(task, &data->o_res.seq_res);
1858}
1859
1860static void nfs4_open_done(struct rpc_task *task, void *calldata)
1861{
1862 struct nfs4_opendata *data = calldata;
1863
1864 data->rpc_status = task->tk_status;
1865
1866 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1867 return;
1868
1869 if (task->tk_status == 0) {
1870 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1871 switch (data->o_res.f_attr->mode & S_IFMT) {
1872 case S_IFREG:
1873 break;
1874 case S_IFLNK:
1875 data->rpc_status = -ELOOP;
1876 break;
1877 case S_IFDIR:
1878 data->rpc_status = -EISDIR;
1879 break;
1880 default:
1881 data->rpc_status = -ENOTDIR;
1882 }
1883 }
1884 renew_lease(data->o_res.server, data->timestamp);
1885 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1886 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1887 }
1888 data->rpc_done = 1;
1889}
1890
1891static void nfs4_open_release(void *calldata)
1892{
1893 struct nfs4_opendata *data = calldata;
1894 struct nfs4_state *state = NULL;
1895
1896 /* If this request hasn't been cancelled, do nothing */
1897 if (data->cancelled == 0)
1898 goto out_free;
1899 /* In case of error, no cleanup! */
1900 if (data->rpc_status != 0 || !data->rpc_done)
1901 goto out_free;
1902 /* In case we need an open_confirm, no cleanup! */
1903 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1904 goto out_free;
1905 state = nfs4_opendata_to_nfs4_state(data);
1906 if (!IS_ERR(state))
1907 nfs4_close_state(state, data->o_arg.fmode);
1908out_free:
1909 nfs4_opendata_put(data);
1910}
1911
1912static const struct rpc_call_ops nfs4_open_ops = {
1913 .rpc_call_prepare = nfs4_open_prepare,
1914 .rpc_call_done = nfs4_open_done,
1915 .rpc_release = nfs4_open_release,
1916};
1917
1918static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1919{
1920 struct inode *dir = data->dir->d_inode;
1921 struct nfs_server *server = NFS_SERVER(dir);
1922 struct nfs_openargs *o_arg = &data->o_arg;
1923 struct nfs_openres *o_res = &data->o_res;
1924 struct rpc_task *task;
1925 struct rpc_message msg = {
1926 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1927 .rpc_argp = o_arg,
1928 .rpc_resp = o_res,
1929 .rpc_cred = data->owner->so_cred,
1930 };
1931 struct rpc_task_setup task_setup_data = {
1932 .rpc_client = server->client,
1933 .rpc_message = &msg,
1934 .callback_ops = &nfs4_open_ops,
1935 .callback_data = data,
1936 .workqueue = nfsiod_workqueue,
1937 .flags = RPC_TASK_ASYNC,
1938 };
1939 int status;
1940
1941 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1942 kref_get(&data->kref);
1943 data->rpc_done = 0;
1944 data->rpc_status = 0;
1945 data->cancelled = 0;
1946 data->is_recover = 0;
1947 if (isrecover) {
1948 nfs4_set_sequence_privileged(&o_arg->seq_args);
1949 data->is_recover = 1;
1950 }
1951 task = rpc_run_task(&task_setup_data);
1952 if (IS_ERR(task))
1953 return PTR_ERR(task);
1954 status = nfs4_wait_for_completion_rpc_task(task);
1955 if (status != 0) {
1956 data->cancelled = 1;
1957 smp_wmb();
1958 } else
1959 status = data->rpc_status;
1960 rpc_put_task(task);
1961
1962 return status;
1963}
1964
1965static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1966{
1967 struct inode *dir = data->dir->d_inode;
1968 struct nfs_openres *o_res = &data->o_res;
1969 int status;
1970
1971 status = nfs4_run_open_task(data, 1);
1972 if (status != 0 || !data->rpc_done)
1973 return status;
1974
1975 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1976
1977 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1978 status = _nfs4_proc_open_confirm(data);
1979 if (status != 0)
1980 return status;
1981 }
1982
1983 return status;
1984}
1985
1986/*
1987 * Additional permission checks in order to distinguish between an
1988 * open for read, and an open for execute. This works around the
1989 * fact that NFSv4 OPEN treats read and execute permissions as being
1990 * the same.
1991 * Note that in the non-execute case, we want to turn off permission
1992 * checking if we just created a new file (POSIX open() semantics).
1993 */
1994static int nfs4_opendata_access(struct rpc_cred *cred,
1995 struct nfs4_opendata *opendata,
1996 struct nfs4_state *state, fmode_t fmode,
1997 int openflags)
1998{
1999 struct nfs_access_entry cache;
2000 u32 mask;
2001
2002 /* access call failed or for some reason the server doesn't
2003 * support any access modes -- defer access call until later */
2004 if (opendata->o_res.access_supported == 0)
2005 return 0;
2006
2007 mask = 0;
2008 /*
2009 * Use openflags to check for exec, because fmode won't
2010 * always have FMODE_EXEC set when file open for exec.
2011 */
2012 if (openflags & __FMODE_EXEC) {
2013 /* ONLY check for exec rights */
2014 mask = MAY_EXEC;
2015 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2016 mask = MAY_READ;
2017
2018 cache.cred = cred;
2019 cache.jiffies = jiffies;
2020 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2021 nfs_access_add_cache(state->inode, &cache);
2022
2023 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2024 return 0;
2025
2026 /* even though OPEN succeeded, access is denied. Close the file */
2027 nfs4_close_state(state, fmode);
2028 return -EACCES;
2029}
2030
2031/*
2032 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2033 */
2034static int _nfs4_proc_open(struct nfs4_opendata *data)
2035{
2036 struct inode *dir = data->dir->d_inode;
2037 struct nfs_server *server = NFS_SERVER(dir);
2038 struct nfs_openargs *o_arg = &data->o_arg;
2039 struct nfs_openres *o_res = &data->o_res;
2040 int status;
2041
2042 status = nfs4_run_open_task(data, 0);
2043 if (!data->rpc_done)
2044 return status;
2045 if (status != 0) {
2046 if (status == -NFS4ERR_BADNAME &&
2047 !(o_arg->open_flags & O_CREAT))
2048 return -ENOENT;
2049 return status;
2050 }
2051
2052 nfs_fattr_map_and_free_names(server, &data->f_attr);
2053
2054 if (o_arg->open_flags & O_CREAT) {
2055 update_changeattr(dir, &o_res->cinfo);
2056 if (o_arg->open_flags & O_EXCL)
2057 data->file_created = 1;
2058 else if (o_res->cinfo.before != o_res->cinfo.after)
2059 data->file_created = 1;
2060 }
2061 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2062 server->caps &= ~NFS_CAP_POSIX_LOCK;
2063 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2064 status = _nfs4_proc_open_confirm(data);
2065 if (status != 0)
2066 return status;
2067 }
2068 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2069 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2070 return 0;
2071}
2072
2073static int nfs4_recover_expired_lease(struct nfs_server *server)
2074{
2075 return nfs4_client_recover_expired_lease(server->nfs_client);
2076}
2077
2078/*
2079 * OPEN_EXPIRED:
2080 * reclaim state on the server after a network partition.
2081 * Assumes caller holds the appropriate lock
2082 */
2083static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2084{
2085 struct nfs4_opendata *opendata;
2086 int ret;
2087
2088 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2089 NFS4_OPEN_CLAIM_FH);
2090 if (IS_ERR(opendata))
2091 return PTR_ERR(opendata);
2092 ret = nfs4_open_recover(opendata, state);
2093 if (ret == -ESTALE)
2094 d_drop(ctx->dentry);
2095 nfs4_opendata_put(opendata);
2096 return ret;
2097}
2098
2099static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2100{
2101 struct nfs_server *server = NFS_SERVER(state->inode);
2102 struct nfs4_exception exception = { };
2103 int err;
2104
2105 do {
2106 err = _nfs4_open_expired(ctx, state);
2107 trace_nfs4_open_expired(ctx, 0, err);
2108 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2109 continue;
2110 switch (err) {
2111 default:
2112 goto out;
2113 case -NFS4ERR_GRACE:
2114 case -NFS4ERR_DELAY:
2115 nfs4_handle_exception(server, err, &exception);
2116 err = 0;
2117 }
2118 } while (exception.retry);
2119out:
2120 return err;
2121}
2122
2123static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2124{
2125 struct nfs_open_context *ctx;
2126 int ret;
2127
2128 ctx = nfs4_state_find_open_context(state);
2129 if (IS_ERR(ctx))
2130 return -EAGAIN;
2131 ret = nfs4_do_open_expired(ctx, state);
2132 put_nfs_open_context(ctx);
2133 return ret;
2134}
2135
2136static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2137{
2138 nfs_remove_bad_delegation(state->inode);
2139 write_seqlock(&state->seqlock);
2140 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2141 write_sequnlock(&state->seqlock);
2142 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2143}
2144
2145static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2146{
2147 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2148 nfs_finish_clear_delegation_stateid(state);
2149}
2150
2151static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2152{
2153 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2154 nfs40_clear_delegation_stateid(state);
2155 return nfs4_open_expired(sp, state);
2156}
2157
2158#if defined(CONFIG_NFS_V4_1)
2159static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2160{
2161 struct nfs_server *server = NFS_SERVER(state->inode);
2162 nfs4_stateid stateid;
2163 struct nfs_delegation *delegation;
2164 struct rpc_cred *cred;
2165 int status;
2166
2167 /* Get the delegation credential for use by test/free_stateid */
2168 rcu_read_lock();
2169 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2170 if (delegation == NULL) {
2171 rcu_read_unlock();
2172 return;
2173 }
2174
2175 nfs4_stateid_copy(&stateid, &delegation->stateid);
2176 cred = get_rpccred(delegation->cred);
2177 rcu_read_unlock();
2178 status = nfs41_test_stateid(server, &stateid, cred);
2179 trace_nfs4_test_delegation_stateid(state, NULL, status);
2180
2181 if (status != NFS_OK) {
2182 /* Free the stateid unless the server explicitly
2183 * informs us the stateid is unrecognized. */
2184 if (status != -NFS4ERR_BAD_STATEID)
2185 nfs41_free_stateid(server, &stateid, cred);
2186 nfs_finish_clear_delegation_stateid(state);
2187 }
2188
2189 put_rpccred(cred);
2190}
2191
2192/**
2193 * nfs41_check_open_stateid - possibly free an open stateid
2194 *
2195 * @state: NFSv4 state for an inode
2196 *
2197 * Returns NFS_OK if recovery for this stateid is now finished.
2198 * Otherwise a negative NFS4ERR value is returned.
2199 */
2200static int nfs41_check_open_stateid(struct nfs4_state *state)
2201{
2202 struct nfs_server *server = NFS_SERVER(state->inode);
2203 nfs4_stateid *stateid = &state->open_stateid;
2204 struct rpc_cred *cred = state->owner->so_cred;
2205 int status;
2206
2207 /* If a state reset has been done, test_stateid is unneeded */
2208 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2209 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2210 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2211 return -NFS4ERR_BAD_STATEID;
2212
2213 status = nfs41_test_stateid(server, stateid, cred);
2214 trace_nfs4_test_open_stateid(state, NULL, status);
2215 if (status != NFS_OK) {
2216 /* Free the stateid unless the server explicitly
2217 * informs us the stateid is unrecognized. */
2218 if (status != -NFS4ERR_BAD_STATEID)
2219 nfs41_free_stateid(server, stateid, cred);
2220
2221 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2222 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2223 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2224 clear_bit(NFS_OPEN_STATE, &state->flags);
2225 }
2226 return status;
2227}
2228
2229static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2230{
2231 int status;
2232
2233 nfs41_check_delegation_stateid(state);
2234 status = nfs41_check_open_stateid(state);
2235 if (status != NFS_OK)
2236 status = nfs4_open_expired(sp, state);
2237 return status;
2238}
2239#endif
2240
2241/*
2242 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2243 * fields corresponding to attributes that were used to store the verifier.
2244 * Make sure we clobber those fields in the later setattr call
2245 */
2246static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2247{
2248 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2249 !(sattr->ia_valid & ATTR_ATIME_SET))
2250 sattr->ia_valid |= ATTR_ATIME;
2251
2252 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2253 !(sattr->ia_valid & ATTR_MTIME_SET))
2254 sattr->ia_valid |= ATTR_MTIME;
2255}
2256
2257static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2258 fmode_t fmode,
2259 int flags,
2260 struct nfs_open_context *ctx)
2261{
2262 struct nfs4_state_owner *sp = opendata->owner;
2263 struct nfs_server *server = sp->so_server;
2264 struct dentry *dentry;
2265 struct nfs4_state *state;
2266 unsigned int seq;
2267 int ret;
2268
2269 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2270
2271 ret = _nfs4_proc_open(opendata);
2272 if (ret != 0)
2273 goto out;
2274
2275 state = nfs4_opendata_to_nfs4_state(opendata);
2276 ret = PTR_ERR(state);
2277 if (IS_ERR(state))
2278 goto out;
2279 if (server->caps & NFS_CAP_POSIX_LOCK)
2280 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2281
2282 dentry = opendata->dentry;
2283 if (dentry->d_inode == NULL) {
2284 /* FIXME: Is this d_drop() ever needed? */
2285 d_drop(dentry);
2286 dentry = d_add_unique(dentry, igrab(state->inode));
2287 if (dentry == NULL) {
2288 dentry = opendata->dentry;
2289 } else if (dentry != ctx->dentry) {
2290 dput(ctx->dentry);
2291 ctx->dentry = dget(dentry);
2292 }
2293 nfs_set_verifier(dentry,
2294 nfs_save_change_attribute(opendata->dir->d_inode));
2295 }
2296
2297 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2298 if (ret != 0)
2299 goto out;
2300
2301 ctx->state = state;
2302 if (dentry->d_inode == state->inode) {
2303 nfs_inode_attach_open_context(ctx);
2304 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2305 nfs4_schedule_stateid_recovery(server, state);
2306 }
2307out:
2308 return ret;
2309}
2310
2311/*
2312 * Returns a referenced nfs4_state
2313 */
2314static int _nfs4_do_open(struct inode *dir,
2315 struct nfs_open_context *ctx,
2316 int flags,
2317 struct iattr *sattr,
2318 struct nfs4_label *label,
2319 int *opened)
2320{
2321 struct nfs4_state_owner *sp;
2322 struct nfs4_state *state = NULL;
2323 struct nfs_server *server = NFS_SERVER(dir);
2324 struct nfs4_opendata *opendata;
2325 struct dentry *dentry = ctx->dentry;
2326 struct rpc_cred *cred = ctx->cred;
2327 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2328 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2329 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2330 struct nfs4_label *olabel = NULL;
2331 int status;
2332
2333 /* Protect against reboot recovery conflicts */
2334 status = -ENOMEM;
2335 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2336 if (sp == NULL) {
2337 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2338 goto out_err;
2339 }
2340 status = nfs4_recover_expired_lease(server);
2341 if (status != 0)
2342 goto err_put_state_owner;
2343 if (dentry->d_inode != NULL)
2344 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2345 status = -ENOMEM;
2346 if (dentry->d_inode)
2347 claim = NFS4_OPEN_CLAIM_FH;
2348 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2349 label, claim, GFP_KERNEL);
2350 if (opendata == NULL)
2351 goto err_put_state_owner;
2352
2353 if (label) {
2354 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2355 if (IS_ERR(olabel)) {
2356 status = PTR_ERR(olabel);
2357 goto err_opendata_put;
2358 }
2359 }
2360
2361 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2362 if (!opendata->f_attr.mdsthreshold) {
2363 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2364 if (!opendata->f_attr.mdsthreshold)
2365 goto err_free_label;
2366 }
2367 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2368 }
2369 if (dentry->d_inode != NULL)
2370 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2371
2372 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2373 if (status != 0)
2374 goto err_free_label;
2375 state = ctx->state;
2376
2377 if ((opendata->o_arg.open_flags & O_EXCL) &&
2378 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2379 nfs4_exclusive_attrset(opendata, sattr);
2380
2381 nfs_fattr_init(opendata->o_res.f_attr);
2382 status = nfs4_do_setattr(state->inode, cred,
2383 opendata->o_res.f_attr, sattr,
2384 state, label, olabel);
2385 if (status == 0) {
2386 nfs_setattr_update_inode(state->inode, sattr);
2387 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2388 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2389 }
2390 }
2391 if (opendata->file_created)
2392 *opened |= FILE_CREATED;
2393
2394 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2395 *ctx_th = opendata->f_attr.mdsthreshold;
2396 opendata->f_attr.mdsthreshold = NULL;
2397 }
2398
2399 nfs4_label_free(olabel);
2400
2401 nfs4_opendata_put(opendata);
2402 nfs4_put_state_owner(sp);
2403 return 0;
2404err_free_label:
2405 nfs4_label_free(olabel);
2406err_opendata_put:
2407 nfs4_opendata_put(opendata);
2408err_put_state_owner:
2409 nfs4_put_state_owner(sp);
2410out_err:
2411 return status;
2412}
2413
2414
2415static struct nfs4_state *nfs4_do_open(struct inode *dir,
2416 struct nfs_open_context *ctx,
2417 int flags,
2418 struct iattr *sattr,
2419 struct nfs4_label *label,
2420 int *opened)
2421{
2422 struct nfs_server *server = NFS_SERVER(dir);
2423 struct nfs4_exception exception = { };
2424 struct nfs4_state *res;
2425 int status;
2426
2427 do {
2428 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2429 res = ctx->state;
2430 trace_nfs4_open_file(ctx, flags, status);
2431 if (status == 0)
2432 break;
2433 /* NOTE: BAD_SEQID means the server and client disagree about the
2434 * book-keeping w.r.t. state-changing operations
2435 * (OPEN/CLOSE/LOCK/LOCKU...)
2436 * It is actually a sign of a bug on the client or on the server.
2437 *
2438 * If we receive a BAD_SEQID error in the particular case of
2439 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2440 * have unhashed the old state_owner for us, and that we can
2441 * therefore safely retry using a new one. We should still warn
2442 * the user though...
2443 */
2444 if (status == -NFS4ERR_BAD_SEQID) {
2445 pr_warn_ratelimited("NFS: v4 server %s "
2446 " returned a bad sequence-id error!\n",
2447 NFS_SERVER(dir)->nfs_client->cl_hostname);
2448 exception.retry = 1;
2449 continue;
2450 }
2451 /*
2452 * BAD_STATEID on OPEN means that the server cancelled our
2453 * state before it received the OPEN_CONFIRM.
2454 * Recover by retrying the request as per the discussion
2455 * on Page 181 of RFC3530.
2456 */
2457 if (status == -NFS4ERR_BAD_STATEID) {
2458 exception.retry = 1;
2459 continue;
2460 }
2461 if (status == -EAGAIN) {
2462 /* We must have found a delegation */
2463 exception.retry = 1;
2464 continue;
2465 }
2466 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2467 continue;
2468 res = ERR_PTR(nfs4_handle_exception(server,
2469 status, &exception));
2470 } while (exception.retry);
2471 return res;
2472}
2473
2474static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2475 struct nfs_fattr *fattr, struct iattr *sattr,
2476 struct nfs4_state *state, struct nfs4_label *ilabel,
2477 struct nfs4_label *olabel)
2478{
2479 struct nfs_server *server = NFS_SERVER(inode);
2480 struct nfs_setattrargs arg = {
2481 .fh = NFS_FH(inode),
2482 .iap = sattr,
2483 .server = server,
2484 .bitmask = server->attr_bitmask,
2485 .label = ilabel,
2486 };
2487 struct nfs_setattrres res = {
2488 .fattr = fattr,
2489 .label = olabel,
2490 .server = server,
2491 };
2492 struct rpc_message msg = {
2493 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2494 .rpc_argp = &arg,
2495 .rpc_resp = &res,
2496 .rpc_cred = cred,
2497 };
2498 unsigned long timestamp = jiffies;
2499 fmode_t fmode;
2500 bool truncate;
2501 int status;
2502
2503 arg.bitmask = nfs4_bitmask(server, ilabel);
2504 if (ilabel)
2505 arg.bitmask = nfs4_bitmask(server, olabel);
2506
2507 nfs_fattr_init(fattr);
2508
2509 /* Servers should only apply open mode checks for file size changes */
2510 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2511 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2512
2513 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2514 /* Use that stateid */
2515 } else if (truncate && state != NULL) {
2516 struct nfs_lockowner lockowner = {
2517 .l_owner = current->files,
2518 .l_pid = current->tgid,
2519 };
2520 if (!nfs4_valid_open_stateid(state))
2521 return -EBADF;
2522 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2523 &lockowner) == -EIO)
2524 return -EBADF;
2525 } else
2526 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2527
2528 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2529 if (status == 0 && state != NULL)
2530 renew_lease(server, timestamp);
2531 return status;
2532}
2533
2534static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2535 struct nfs_fattr *fattr, struct iattr *sattr,
2536 struct nfs4_state *state, struct nfs4_label *ilabel,
2537 struct nfs4_label *olabel)
2538{
2539 struct nfs_server *server = NFS_SERVER(inode);
2540 struct nfs4_exception exception = {
2541 .state = state,
2542 .inode = inode,
2543 };
2544 int err;
2545 do {
2546 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2547 trace_nfs4_setattr(inode, err);
2548 switch (err) {
2549 case -NFS4ERR_OPENMODE:
2550 if (!(sattr->ia_valid & ATTR_SIZE)) {
2551 pr_warn_once("NFSv4: server %s is incorrectly "
2552 "applying open mode checks to "
2553 "a SETATTR that is not "
2554 "changing file size.\n",
2555 server->nfs_client->cl_hostname);
2556 }
2557 if (state && !(state->state & FMODE_WRITE)) {
2558 err = -EBADF;
2559 if (sattr->ia_valid & ATTR_OPEN)
2560 err = -EACCES;
2561 goto out;
2562 }
2563 }
2564 err = nfs4_handle_exception(server, err, &exception);
2565 } while (exception.retry);
2566out:
2567 return err;
2568}
2569
2570struct nfs4_closedata {
2571 struct inode *inode;
2572 struct nfs4_state *state;
2573 struct nfs_closeargs arg;
2574 struct nfs_closeres res;
2575 struct nfs_fattr fattr;
2576 unsigned long timestamp;
2577 bool roc;
2578 u32 roc_barrier;
2579};
2580
2581static void nfs4_free_closedata(void *data)
2582{
2583 struct nfs4_closedata *calldata = data;
2584 struct nfs4_state_owner *sp = calldata->state->owner;
2585 struct super_block *sb = calldata->state->inode->i_sb;
2586
2587 if (calldata->roc)
2588 pnfs_roc_release(calldata->state->inode);
2589 nfs4_put_open_state(calldata->state);
2590 nfs_free_seqid(calldata->arg.seqid);
2591 nfs4_put_state_owner(sp);
2592 nfs_sb_deactive(sb);
2593 kfree(calldata);
2594}
2595
2596static void nfs4_close_done(struct rpc_task *task, void *data)
2597{
2598 struct nfs4_closedata *calldata = data;
2599 struct nfs4_state *state = calldata->state;
2600 struct nfs_server *server = NFS_SERVER(calldata->inode);
2601 nfs4_stateid *res_stateid = NULL;
2602
2603 dprintk("%s: begin!\n", __func__);
2604 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2605 return;
2606 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2607 /* hmm. we are done with the inode, and in the process of freeing
2608 * the state_owner. we keep this around to process errors
2609 */
2610 switch (task->tk_status) {
2611 case 0:
2612 res_stateid = &calldata->res.stateid;
2613 if (calldata->arg.fmode == 0 && calldata->roc)
2614 pnfs_roc_set_barrier(state->inode,
2615 calldata->roc_barrier);
2616 renew_lease(server, calldata->timestamp);
2617 break;
2618 case -NFS4ERR_ADMIN_REVOKED:
2619 case -NFS4ERR_STALE_STATEID:
2620 case -NFS4ERR_OLD_STATEID:
2621 case -NFS4ERR_BAD_STATEID:
2622 case -NFS4ERR_EXPIRED:
2623 if (!nfs4_stateid_match(&calldata->arg.stateid,
2624 &state->stateid)) {
2625 rpc_restart_call_prepare(task);
2626 goto out_release;
2627 }
2628 if (calldata->arg.fmode == 0)
2629 break;
2630 default:
2631 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2632 rpc_restart_call_prepare(task);
2633 goto out_release;
2634 }
2635 }
2636 nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2637out_release:
2638 nfs_release_seqid(calldata->arg.seqid);
2639 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2640 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2641}
2642
2643static void nfs4_close_prepare(struct rpc_task *task, void *data)
2644{
2645 struct nfs4_closedata *calldata = data;
2646 struct nfs4_state *state = calldata->state;
2647 struct inode *inode = calldata->inode;
2648 bool is_rdonly, is_wronly, is_rdwr;
2649 int call_close = 0;
2650
2651 dprintk("%s: begin!\n", __func__);
2652 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2653 goto out_wait;
2654
2655 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2656 spin_lock(&state->owner->so_lock);
2657 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2658 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2659 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2660 nfs4_stateid_copy(&calldata->arg.stateid, &state->stateid);
2661 /* Calculate the change in open mode */
2662 calldata->arg.fmode = 0;
2663 if (state->n_rdwr == 0) {
2664 if (state->n_rdonly == 0)
2665 call_close |= is_rdonly;
2666 else if (is_rdonly)
2667 calldata->arg.fmode |= FMODE_READ;
2668 if (state->n_wronly == 0)
2669 call_close |= is_wronly;
2670 else if (is_wronly)
2671 calldata->arg.fmode |= FMODE_WRITE;
2672 } else if (is_rdwr)
2673 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2674
2675 if (calldata->arg.fmode == 0)
2676 call_close |= is_rdwr;
2677
2678 if (!nfs4_valid_open_stateid(state))
2679 call_close = 0;
2680 spin_unlock(&state->owner->so_lock);
2681
2682 if (!call_close) {
2683 /* Note: exit _without_ calling nfs4_close_done */
2684 goto out_no_action;
2685 }
2686
2687 if (calldata->arg.fmode == 0) {
2688 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2689 if (calldata->roc &&
2690 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2691 nfs_release_seqid(calldata->arg.seqid);
2692 goto out_wait;
2693 }
2694 }
2695
2696 nfs_fattr_init(calldata->res.fattr);
2697 calldata->timestamp = jiffies;
2698 if (nfs4_setup_sequence(NFS_SERVER(inode),
2699 &calldata->arg.seq_args,
2700 &calldata->res.seq_res,
2701 task) != 0)
2702 nfs_release_seqid(calldata->arg.seqid);
2703 dprintk("%s: done!\n", __func__);
2704 return;
2705out_no_action:
2706 task->tk_action = NULL;
2707out_wait:
2708 nfs4_sequence_done(task, &calldata->res.seq_res);
2709}
2710
2711static const struct rpc_call_ops nfs4_close_ops = {
2712 .rpc_call_prepare = nfs4_close_prepare,
2713 .rpc_call_done = nfs4_close_done,
2714 .rpc_release = nfs4_free_closedata,
2715};
2716
2717static bool nfs4_state_has_opener(struct nfs4_state *state)
2718{
2719 /* first check existing openers */
2720 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2721 state->n_rdonly != 0)
2722 return true;
2723
2724 if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2725 state->n_wronly != 0)
2726 return true;
2727
2728 if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2729 state->n_rdwr != 0)
2730 return true;
2731
2732 return false;
2733}
2734
2735static bool nfs4_roc(struct inode *inode)
2736{
2737 struct nfs_inode *nfsi = NFS_I(inode);
2738 struct nfs_open_context *ctx;
2739 struct nfs4_state *state;
2740
2741 spin_lock(&inode->i_lock);
2742 list_for_each_entry(ctx, &nfsi->open_files, list) {
2743 state = ctx->state;
2744 if (state == NULL)
2745 continue;
2746 if (nfs4_state_has_opener(state)) {
2747 spin_unlock(&inode->i_lock);
2748 return false;
2749 }
2750 }
2751 spin_unlock(&inode->i_lock);
2752
2753 if (nfs4_check_delegation(inode, FMODE_READ))
2754 return false;
2755
2756 return pnfs_roc(inode);
2757}
2758
2759/*
2760 * It is possible for data to be read/written from a mem-mapped file
2761 * after the sys_close call (which hits the vfs layer as a flush).
2762 * This means that we can't safely call nfsv4 close on a file until
2763 * the inode is cleared. This in turn means that we are not good
2764 * NFSv4 citizens - we do not indicate to the server to update the file's
2765 * share state even when we are done with one of the three share
2766 * stateid's in the inode.
2767 *
2768 * NOTE: Caller must be holding the sp->so_owner semaphore!
2769 */
2770int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2771{
2772 struct nfs_server *server = NFS_SERVER(state->inode);
2773 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2774 struct nfs4_closedata *calldata;
2775 struct nfs4_state_owner *sp = state->owner;
2776 struct rpc_task *task;
2777 struct rpc_message msg = {
2778 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2779 .rpc_cred = state->owner->so_cred,
2780 };
2781 struct rpc_task_setup task_setup_data = {
2782 .rpc_client = server->client,
2783 .rpc_message = &msg,
2784 .callback_ops = &nfs4_close_ops,
2785 .workqueue = nfsiod_workqueue,
2786 .flags = RPC_TASK_ASYNC,
2787 };
2788 int status = -ENOMEM;
2789
2790 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2791 &task_setup_data.rpc_client, &msg);
2792
2793 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2794 if (calldata == NULL)
2795 goto out;
2796 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2797 calldata->inode = state->inode;
2798 calldata->state = state;
2799 calldata->arg.fh = NFS_FH(state->inode);
2800 /* Serialization for the sequence id */
2801 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2802 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2803 if (IS_ERR(calldata->arg.seqid))
2804 goto out_free_calldata;
2805 calldata->arg.fmode = 0;
2806 calldata->arg.bitmask = server->cache_consistency_bitmask;
2807 calldata->res.fattr = &calldata->fattr;
2808 calldata->res.seqid = calldata->arg.seqid;
2809 calldata->res.server = server;
2810 calldata->roc = nfs4_roc(state->inode);
2811 nfs_sb_active(calldata->inode->i_sb);
2812
2813 msg.rpc_argp = &calldata->arg;
2814 msg.rpc_resp = &calldata->res;
2815 task_setup_data.callback_data = calldata;
2816 task = rpc_run_task(&task_setup_data);
2817 if (IS_ERR(task))
2818 return PTR_ERR(task);
2819 status = 0;
2820 if (wait)
2821 status = rpc_wait_for_completion_task(task);
2822 rpc_put_task(task);
2823 return status;
2824out_free_calldata:
2825 kfree(calldata);
2826out:
2827 nfs4_put_open_state(state);
2828 nfs4_put_state_owner(sp);
2829 return status;
2830}
2831
2832static struct inode *
2833nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2834 int open_flags, struct iattr *attr, int *opened)
2835{
2836 struct nfs4_state *state;
2837 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2838
2839 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2840
2841 /* Protect against concurrent sillydeletes */
2842 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2843
2844 nfs4_label_release_security(label);
2845
2846 if (IS_ERR(state))
2847 return ERR_CAST(state);
2848 return state->inode;
2849}
2850
2851static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2852{
2853 if (ctx->state == NULL)
2854 return;
2855 if (is_sync)
2856 nfs4_close_sync(ctx->state, ctx->mode);
2857 else
2858 nfs4_close_state(ctx->state, ctx->mode);
2859}
2860
2861#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2862#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2863#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2864
2865static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2866{
2867 struct nfs4_server_caps_arg args = {
2868 .fhandle = fhandle,
2869 };
2870 struct nfs4_server_caps_res res = {};
2871 struct rpc_message msg = {
2872 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2873 .rpc_argp = &args,
2874 .rpc_resp = &res,
2875 };
2876 int status;
2877
2878 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2879 if (status == 0) {
2880 /* Sanity check the server answers */
2881 switch (server->nfs_client->cl_minorversion) {
2882 case 0:
2883 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2884 res.attr_bitmask[2] = 0;
2885 break;
2886 case 1:
2887 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2888 break;
2889 case 2:
2890 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2891 }
2892 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2893 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2894 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2895 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2896 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2897 NFS_CAP_CTIME|NFS_CAP_MTIME|
2898 NFS_CAP_SECURITY_LABEL);
2899 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2900 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2901 server->caps |= NFS_CAP_ACLS;
2902 if (res.has_links != 0)
2903 server->caps |= NFS_CAP_HARDLINKS;
2904 if (res.has_symlinks != 0)
2905 server->caps |= NFS_CAP_SYMLINKS;
2906 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2907 server->caps |= NFS_CAP_FILEID;
2908 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2909 server->caps |= NFS_CAP_MODE;
2910 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2911 server->caps |= NFS_CAP_NLINK;
2912 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2913 server->caps |= NFS_CAP_OWNER;
2914 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2915 server->caps |= NFS_CAP_OWNER_GROUP;
2916 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2917 server->caps |= NFS_CAP_ATIME;
2918 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2919 server->caps |= NFS_CAP_CTIME;
2920 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2921 server->caps |= NFS_CAP_MTIME;
2922#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2923 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2924 server->caps |= NFS_CAP_SECURITY_LABEL;
2925#endif
2926 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2927 sizeof(server->attr_bitmask));
2928 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2929
2930 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2931 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2932 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2933 server->cache_consistency_bitmask[2] = 0;
2934 server->acl_bitmask = res.acl_bitmask;
2935 server->fh_expire_type = res.fh_expire_type;
2936 }
2937
2938 return status;
2939}
2940
2941int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2942{
2943 struct nfs4_exception exception = { };
2944 int err;
2945 do {
2946 err = nfs4_handle_exception(server,
2947 _nfs4_server_capabilities(server, fhandle),
2948 &exception);
2949 } while (exception.retry);
2950 return err;
2951}
2952
2953static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2954 struct nfs_fsinfo *info)
2955{
2956 u32 bitmask[3];
2957 struct nfs4_lookup_root_arg args = {
2958 .bitmask = bitmask,
2959 };
2960 struct nfs4_lookup_res res = {
2961 .server = server,
2962 .fattr = info->fattr,
2963 .fh = fhandle,
2964 };
2965 struct rpc_message msg = {
2966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2967 .rpc_argp = &args,
2968 .rpc_resp = &res,
2969 };
2970
2971 bitmask[0] = nfs4_fattr_bitmap[0];
2972 bitmask[1] = nfs4_fattr_bitmap[1];
2973 /*
2974 * Process the label in the upcoming getfattr
2975 */
2976 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2977
2978 nfs_fattr_init(info->fattr);
2979 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2980}
2981
2982static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2983 struct nfs_fsinfo *info)
2984{
2985 struct nfs4_exception exception = { };
2986 int err;
2987 do {
2988 err = _nfs4_lookup_root(server, fhandle, info);
2989 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2990 switch (err) {
2991 case 0:
2992 case -NFS4ERR_WRONGSEC:
2993 goto out;
2994 default:
2995 err = nfs4_handle_exception(server, err, &exception);
2996 }
2997 } while (exception.retry);
2998out:
2999 return err;
3000}
3001
3002static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3003 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3004{
3005 struct rpc_auth_create_args auth_args = {
3006 .pseudoflavor = flavor,
3007 };
3008 struct rpc_auth *auth;
3009 int ret;
3010
3011 auth = rpcauth_create(&auth_args, server->client);
3012 if (IS_ERR(auth)) {
3013 ret = -EACCES;
3014 goto out;
3015 }
3016 ret = nfs4_lookup_root(server, fhandle, info);
3017out:
3018 return ret;
3019}
3020
3021/*
3022 * Retry pseudoroot lookup with various security flavors. We do this when:
3023 *
3024 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3025 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3026 *
3027 * Returns zero on success, or a negative NFS4ERR value, or a
3028 * negative errno value.
3029 */
3030static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3031 struct nfs_fsinfo *info)
3032{
3033 /* Per 3530bis 15.33.5 */
3034 static const rpc_authflavor_t flav_array[] = {
3035 RPC_AUTH_GSS_KRB5P,
3036 RPC_AUTH_GSS_KRB5I,
3037 RPC_AUTH_GSS_KRB5,
3038 RPC_AUTH_UNIX, /* courtesy */
3039 RPC_AUTH_NULL,
3040 };
3041 int status = -EPERM;
3042 size_t i;
3043
3044 if (server->auth_info.flavor_len > 0) {
3045 /* try each flavor specified by user */
3046 for (i = 0; i < server->auth_info.flavor_len; i++) {
3047 status = nfs4_lookup_root_sec(server, fhandle, info,
3048 server->auth_info.flavors[i]);
3049 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3050 continue;
3051 break;
3052 }
3053 } else {
3054 /* no flavors specified by user, try default list */
3055 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3056 status = nfs4_lookup_root_sec(server, fhandle, info,
3057 flav_array[i]);
3058 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3059 continue;
3060 break;
3061 }
3062 }
3063
3064 /*
3065 * -EACCESS could mean that the user doesn't have correct permissions
3066 * to access the mount. It could also mean that we tried to mount
3067 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3068 * existing mount programs don't handle -EACCES very well so it should
3069 * be mapped to -EPERM instead.
3070 */
3071 if (status == -EACCES)
3072 status = -EPERM;
3073 return status;
3074}
3075
3076static int nfs4_do_find_root_sec(struct nfs_server *server,
3077 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3078{
3079 int mv = server->nfs_client->cl_minorversion;
3080 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3081}
3082
3083/**
3084 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3085 * @server: initialized nfs_server handle
3086 * @fhandle: we fill in the pseudo-fs root file handle
3087 * @info: we fill in an FSINFO struct
3088 * @auth_probe: probe the auth flavours
3089 *
3090 * Returns zero on success, or a negative errno.
3091 */
3092int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3093 struct nfs_fsinfo *info,
3094 bool auth_probe)
3095{
3096 int status;
3097
3098 switch (auth_probe) {
3099 case false:
3100 status = nfs4_lookup_root(server, fhandle, info);
3101 if (status != -NFS4ERR_WRONGSEC)
3102 break;
3103 default:
3104 status = nfs4_do_find_root_sec(server, fhandle, info);
3105 }
3106
3107 if (status == 0)
3108 status = nfs4_server_capabilities(server, fhandle);
3109 if (status == 0)
3110 status = nfs4_do_fsinfo(server, fhandle, info);
3111
3112 return nfs4_map_errors(status);
3113}
3114
3115static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3116 struct nfs_fsinfo *info)
3117{
3118 int error;
3119 struct nfs_fattr *fattr = info->fattr;
3120 struct nfs4_label *label = NULL;
3121
3122 error = nfs4_server_capabilities(server, mntfh);
3123 if (error < 0) {
3124 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3125 return error;
3126 }
3127
3128 label = nfs4_label_alloc(server, GFP_KERNEL);
3129 if (IS_ERR(label))
3130 return PTR_ERR(label);
3131
3132 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3133 if (error < 0) {
3134 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3135 goto err_free_label;
3136 }
3137
3138 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3139 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3140 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3141
3142err_free_label:
3143 nfs4_label_free(label);
3144
3145 return error;
3146}
3147
3148/*
3149 * Get locations and (maybe) other attributes of a referral.
3150 * Note that we'll actually follow the referral later when
3151 * we detect fsid mismatch in inode revalidation
3152 */
3153static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3154 const struct qstr *name, struct nfs_fattr *fattr,
3155 struct nfs_fh *fhandle)
3156{
3157 int status = -ENOMEM;
3158 struct page *page = NULL;
3159 struct nfs4_fs_locations *locations = NULL;
3160
3161 page = alloc_page(GFP_KERNEL);
3162 if (page == NULL)
3163 goto out;
3164 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3165 if (locations == NULL)
3166 goto out;
3167
3168 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3169 if (status != 0)
3170 goto out;
3171
3172 /*
3173 * If the fsid didn't change, this is a migration event, not a
3174 * referral. Cause us to drop into the exception handler, which
3175 * will kick off migration recovery.
3176 */
3177 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3178 dprintk("%s: server did not return a different fsid for"
3179 " a referral at %s\n", __func__, name->name);
3180 status = -NFS4ERR_MOVED;
3181 goto out;
3182 }
3183 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3184 nfs_fixup_referral_attributes(&locations->fattr);
3185
3186 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3187 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3188 memset(fhandle, 0, sizeof(struct nfs_fh));
3189out:
3190 if (page)
3191 __free_page(page);
3192 kfree(locations);
3193 return status;
3194}
3195
3196static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3197 struct nfs_fattr *fattr, struct nfs4_label *label)
3198{
3199 struct nfs4_getattr_arg args = {
3200 .fh = fhandle,
3201 .bitmask = server->attr_bitmask,
3202 };
3203 struct nfs4_getattr_res res = {
3204 .fattr = fattr,
3205 .label = label,
3206 .server = server,
3207 };
3208 struct rpc_message msg = {
3209 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3210 .rpc_argp = &args,
3211 .rpc_resp = &res,
3212 };
3213
3214 args.bitmask = nfs4_bitmask(server, label);
3215
3216 nfs_fattr_init(fattr);
3217 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3218}
3219
3220static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3221 struct nfs_fattr *fattr, struct nfs4_label *label)
3222{
3223 struct nfs4_exception exception = { };
3224 int err;
3225 do {
3226 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3227 trace_nfs4_getattr(server, fhandle, fattr, err);
3228 err = nfs4_handle_exception(server, err,
3229 &exception);
3230 } while (exception.retry);
3231 return err;
3232}
3233
3234/*
3235 * The file is not closed if it is opened due to the a request to change
3236 * the size of the file. The open call will not be needed once the
3237 * VFS layer lookup-intents are implemented.
3238 *
3239 * Close is called when the inode is destroyed.
3240 * If we haven't opened the file for O_WRONLY, we
3241 * need to in the size_change case to obtain a stateid.
3242 *
3243 * Got race?
3244 * Because OPEN is always done by name in nfsv4, it is
3245 * possible that we opened a different file by the same
3246 * name. We can recognize this race condition, but we
3247 * can't do anything about it besides returning an error.
3248 *
3249 * This will be fixed with VFS changes (lookup-intent).
3250 */
3251static int
3252nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3253 struct iattr *sattr)
3254{
3255 struct inode *inode = dentry->d_inode;
3256 struct rpc_cred *cred = NULL;
3257 struct nfs4_state *state = NULL;
3258 struct nfs4_label *label = NULL;
3259 int status;
3260
3261 if (pnfs_ld_layoutret_on_setattr(inode) &&
3262 sattr->ia_valid & ATTR_SIZE &&
3263 sattr->ia_size < i_size_read(inode))
3264 pnfs_commit_and_return_layout(inode);
3265
3266 nfs_fattr_init(fattr);
3267
3268 /* Deal with open(O_TRUNC) */
3269 if (sattr->ia_valid & ATTR_OPEN)
3270 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3271
3272 /* Optimization: if the end result is no change, don't RPC */
3273 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3274 return 0;
3275
3276 /* Search for an existing open(O_WRITE) file */
3277 if (sattr->ia_valid & ATTR_FILE) {
3278 struct nfs_open_context *ctx;
3279
3280 ctx = nfs_file_open_context(sattr->ia_file);
3281 if (ctx) {
3282 cred = ctx->cred;
3283 state = ctx->state;
3284 }
3285 }
3286
3287 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3288 if (IS_ERR(label))
3289 return PTR_ERR(label);
3290
3291 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3292 if (status == 0) {
3293 nfs_setattr_update_inode(inode, sattr);
3294 nfs_setsecurity(inode, fattr, label);
3295 }
3296 nfs4_label_free(label);
3297 return status;
3298}
3299
3300static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3301 const struct qstr *name, struct nfs_fh *fhandle,
3302 struct nfs_fattr *fattr, struct nfs4_label *label)
3303{
3304 struct nfs_server *server = NFS_SERVER(dir);
3305 int status;
3306 struct nfs4_lookup_arg args = {
3307 .bitmask = server->attr_bitmask,
3308 .dir_fh = NFS_FH(dir),
3309 .name = name,
3310 };
3311 struct nfs4_lookup_res res = {
3312 .server = server,
3313 .fattr = fattr,
3314 .label = label,
3315 .fh = fhandle,
3316 };
3317 struct rpc_message msg = {
3318 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3319 .rpc_argp = &args,
3320 .rpc_resp = &res,
3321 };
3322
3323 args.bitmask = nfs4_bitmask(server, label);
3324
3325 nfs_fattr_init(fattr);
3326
3327 dprintk("NFS call lookup %s\n", name->name);
3328 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3329 dprintk("NFS reply lookup: %d\n", status);
3330 return status;
3331}
3332
3333static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3334{
3335 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3336 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3337 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3338 fattr->nlink = 2;
3339}
3340
3341static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3342 struct qstr *name, struct nfs_fh *fhandle,
3343 struct nfs_fattr *fattr, struct nfs4_label *label)
3344{
3345 struct nfs4_exception exception = { };
3346 struct rpc_clnt *client = *clnt;
3347 int err;
3348 do {
3349 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3350 trace_nfs4_lookup(dir, name, err);
3351 switch (err) {
3352 case -NFS4ERR_BADNAME:
3353 err = -ENOENT;
3354 goto out;
3355 case -NFS4ERR_MOVED:
3356 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3357 goto out;
3358 case -NFS4ERR_WRONGSEC:
3359 err = -EPERM;
3360 if (client != *clnt)
3361 goto out;
3362 client = nfs4_negotiate_security(client, dir, name);
3363 if (IS_ERR(client))
3364 return PTR_ERR(client);
3365
3366 exception.retry = 1;
3367 break;
3368 default:
3369 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3370 }
3371 } while (exception.retry);
3372
3373out:
3374 if (err == 0)
3375 *clnt = client;
3376 else if (client != *clnt)
3377 rpc_shutdown_client(client);
3378
3379 return err;
3380}
3381
3382static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3383 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3384 struct nfs4_label *label)
3385{
3386 int status;
3387 struct rpc_clnt *client = NFS_CLIENT(dir);
3388
3389 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3390 if (client != NFS_CLIENT(dir)) {
3391 rpc_shutdown_client(client);
3392 nfs_fixup_secinfo_attributes(fattr);
3393 }
3394 return status;
3395}
3396
3397struct rpc_clnt *
3398nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3399 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3400{
3401 struct rpc_clnt *client = NFS_CLIENT(dir);
3402 int status;
3403
3404 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3405 if (status < 0)
3406 return ERR_PTR(status);
3407 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3408}
3409
3410static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3411{
3412 struct nfs_server *server = NFS_SERVER(inode);
3413 struct nfs4_accessargs args = {
3414 .fh = NFS_FH(inode),
3415 .bitmask = server->cache_consistency_bitmask,
3416 };
3417 struct nfs4_accessres res = {
3418 .server = server,
3419 };
3420 struct rpc_message msg = {
3421 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3422 .rpc_argp = &args,
3423 .rpc_resp = &res,
3424 .rpc_cred = entry->cred,
3425 };
3426 int mode = entry->mask;
3427 int status = 0;
3428
3429 /*
3430 * Determine which access bits we want to ask for...
3431 */
3432 if (mode & MAY_READ)
3433 args.access |= NFS4_ACCESS_READ;
3434 if (S_ISDIR(inode->i_mode)) {
3435 if (mode & MAY_WRITE)
3436 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3437 if (mode & MAY_EXEC)
3438 args.access |= NFS4_ACCESS_LOOKUP;
3439 } else {
3440 if (mode & MAY_WRITE)
3441 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3442 if (mode & MAY_EXEC)
3443 args.access |= NFS4_ACCESS_EXECUTE;
3444 }
3445
3446 res.fattr = nfs_alloc_fattr();
3447 if (res.fattr == NULL)
3448 return -ENOMEM;
3449
3450 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3451 if (!status) {
3452 nfs_access_set_mask(entry, res.access);
3453 nfs_refresh_inode(inode, res.fattr);
3454 }
3455 nfs_free_fattr(res.fattr);
3456 return status;
3457}
3458
3459static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3460{
3461 struct nfs4_exception exception = { };
3462 int err;
3463 do {
3464 err = _nfs4_proc_access(inode, entry);
3465 trace_nfs4_access(inode, err);
3466 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3467 &exception);
3468 } while (exception.retry);
3469 return err;
3470}
3471
3472/*
3473 * TODO: For the time being, we don't try to get any attributes
3474 * along with any of the zero-copy operations READ, READDIR,
3475 * READLINK, WRITE.
3476 *
3477 * In the case of the first three, we want to put the GETATTR
3478 * after the read-type operation -- this is because it is hard
3479 * to predict the length of a GETATTR response in v4, and thus
3480 * align the READ data correctly. This means that the GETATTR
3481 * may end up partially falling into the page cache, and we should
3482 * shift it into the 'tail' of the xdr_buf before processing.
3483 * To do this efficiently, we need to know the total length
3484 * of data received, which doesn't seem to be available outside
3485 * of the RPC layer.
3486 *
3487 * In the case of WRITE, we also want to put the GETATTR after
3488 * the operation -- in this case because we want to make sure
3489 * we get the post-operation mtime and size.
3490 *
3491 * Both of these changes to the XDR layer would in fact be quite
3492 * minor, but I decided to leave them for a subsequent patch.
3493 */
3494static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3495 unsigned int pgbase, unsigned int pglen)
3496{
3497 struct nfs4_readlink args = {
3498 .fh = NFS_FH(inode),
3499 .pgbase = pgbase,
3500 .pglen = pglen,
3501 .pages = &page,
3502 };
3503 struct nfs4_readlink_res res;
3504 struct rpc_message msg = {
3505 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3506 .rpc_argp = &args,
3507 .rpc_resp = &res,
3508 };
3509
3510 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3511}
3512
3513static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3514 unsigned int pgbase, unsigned int pglen)
3515{
3516 struct nfs4_exception exception = { };
3517 int err;
3518 do {
3519 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3520 trace_nfs4_readlink(inode, err);
3521 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3522 &exception);
3523 } while (exception.retry);
3524 return err;
3525}
3526
3527/*
3528 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3529 */
3530static int
3531nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3532 int flags)
3533{
3534 struct nfs4_label l, *ilabel = NULL;
3535 struct nfs_open_context *ctx;
3536 struct nfs4_state *state;
3537 int opened = 0;
3538 int status = 0;
3539
3540 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3541 if (IS_ERR(ctx))
3542 return PTR_ERR(ctx);
3543
3544 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3545
3546 sattr->ia_mode &= ~current_umask();
3547 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3548 if (IS_ERR(state)) {
3549 status = PTR_ERR(state);
3550 goto out;
3551 }
3552out:
3553 nfs4_label_release_security(ilabel);
3554 put_nfs_open_context(ctx);
3555 return status;
3556}
3557
3558static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3559{
3560 struct nfs_server *server = NFS_SERVER(dir);
3561 struct nfs_removeargs args = {
3562 .fh = NFS_FH(dir),
3563 .name = *name,
3564 };
3565 struct nfs_removeres res = {
3566 .server = server,
3567 };
3568 struct rpc_message msg = {
3569 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3570 .rpc_argp = &args,
3571 .rpc_resp = &res,
3572 };
3573 int status;
3574
3575 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3576 if (status == 0)
3577 update_changeattr(dir, &res.cinfo);
3578 return status;
3579}
3580
3581static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3582{
3583 struct nfs4_exception exception = { };
3584 int err;
3585 do {
3586 err = _nfs4_proc_remove(dir, name);
3587 trace_nfs4_remove(dir, name, err);
3588 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3589 &exception);
3590 } while (exception.retry);
3591 return err;
3592}
3593
3594static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3595{
3596 struct nfs_server *server = NFS_SERVER(dir);
3597 struct nfs_removeargs *args = msg->rpc_argp;
3598 struct nfs_removeres *res = msg->rpc_resp;
3599
3600 res->server = server;
3601 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3602 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3603
3604 nfs_fattr_init(res->dir_attr);
3605}
3606
3607static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3608{
3609 nfs4_setup_sequence(NFS_SERVER(data->dir),
3610 &data->args.seq_args,
3611 &data->res.seq_res,
3612 task);
3613}
3614
3615static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3616{
3617 struct nfs_unlinkdata *data = task->tk_calldata;
3618 struct nfs_removeres *res = &data->res;
3619
3620 if (!nfs4_sequence_done(task, &res->seq_res))
3621 return 0;
3622 if (nfs4_async_handle_error(task, res->server, NULL,
3623 &data->timeout) == -EAGAIN)
3624 return 0;
3625 update_changeattr(dir, &res->cinfo);
3626 return 1;
3627}
3628
3629static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3630{
3631 struct nfs_server *server = NFS_SERVER(dir);
3632 struct nfs_renameargs *arg = msg->rpc_argp;
3633 struct nfs_renameres *res = msg->rpc_resp;
3634
3635 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3636 res->server = server;
3637 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3638}
3639
3640static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3641{
3642 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3643 &data->args.seq_args,
3644 &data->res.seq_res,
3645 task);
3646}
3647
3648static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3649 struct inode *new_dir)
3650{
3651 struct nfs_renamedata *data = task->tk_calldata;
3652 struct nfs_renameres *res = &data->res;
3653
3654 if (!nfs4_sequence_done(task, &res->seq_res))
3655 return 0;
3656 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3657 return 0;
3658
3659 update_changeattr(old_dir, &res->old_cinfo);
3660 update_changeattr(new_dir, &res->new_cinfo);
3661 return 1;
3662}
3663
3664static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3665{
3666 struct nfs_server *server = NFS_SERVER(inode);
3667 struct nfs4_link_arg arg = {
3668 .fh = NFS_FH(inode),
3669 .dir_fh = NFS_FH(dir),
3670 .name = name,
3671 .bitmask = server->attr_bitmask,
3672 };
3673 struct nfs4_link_res res = {
3674 .server = server,
3675 .label = NULL,
3676 };
3677 struct rpc_message msg = {
3678 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3679 .rpc_argp = &arg,
3680 .rpc_resp = &res,
3681 };
3682 int status = -ENOMEM;
3683
3684 res.fattr = nfs_alloc_fattr();
3685 if (res.fattr == NULL)
3686 goto out;
3687
3688 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3689 if (IS_ERR(res.label)) {
3690 status = PTR_ERR(res.label);
3691 goto out;
3692 }
3693 arg.bitmask = nfs4_bitmask(server, res.label);
3694
3695 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3696 if (!status) {
3697 update_changeattr(dir, &res.cinfo);
3698 status = nfs_post_op_update_inode(inode, res.fattr);
3699 if (!status)
3700 nfs_setsecurity(inode, res.fattr, res.label);
3701 }
3702
3703
3704 nfs4_label_free(res.label);
3705
3706out:
3707 nfs_free_fattr(res.fattr);
3708 return status;
3709}
3710
3711static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3712{
3713 struct nfs4_exception exception = { };
3714 int err;
3715 do {
3716 err = nfs4_handle_exception(NFS_SERVER(inode),
3717 _nfs4_proc_link(inode, dir, name),
3718 &exception);
3719 } while (exception.retry);
3720 return err;
3721}
3722
3723struct nfs4_createdata {
3724 struct rpc_message msg;
3725 struct nfs4_create_arg arg;
3726 struct nfs4_create_res res;
3727 struct nfs_fh fh;
3728 struct nfs_fattr fattr;
3729 struct nfs4_label *label;
3730};
3731
3732static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3733 struct qstr *name, struct iattr *sattr, u32 ftype)
3734{
3735 struct nfs4_createdata *data;
3736
3737 data = kzalloc(sizeof(*data), GFP_KERNEL);
3738 if (data != NULL) {
3739 struct nfs_server *server = NFS_SERVER(dir);
3740
3741 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3742 if (IS_ERR(data->label))
3743 goto out_free;
3744
3745 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3746 data->msg.rpc_argp = &data->arg;
3747 data->msg.rpc_resp = &data->res;
3748 data->arg.dir_fh = NFS_FH(dir);
3749 data->arg.server = server;
3750 data->arg.name = name;
3751 data->arg.attrs = sattr;
3752 data->arg.ftype = ftype;
3753 data->arg.bitmask = nfs4_bitmask(server, data->label);
3754 data->res.server = server;
3755 data->res.fh = &data->fh;
3756 data->res.fattr = &data->fattr;
3757 data->res.label = data->label;
3758 nfs_fattr_init(data->res.fattr);
3759 }
3760 return data;
3761out_free:
3762 kfree(data);
3763 return NULL;
3764}
3765
3766static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3767{
3768 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3769 &data->arg.seq_args, &data->res.seq_res, 1);
3770 if (status == 0) {
3771 update_changeattr(dir, &data->res.dir_cinfo);
3772 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3773 }
3774 return status;
3775}
3776
3777static void nfs4_free_createdata(struct nfs4_createdata *data)
3778{
3779 nfs4_label_free(data->label);
3780 kfree(data);
3781}
3782
3783static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3784 struct page *page, unsigned int len, struct iattr *sattr,
3785 struct nfs4_label *label)
3786{
3787 struct nfs4_createdata *data;
3788 int status = -ENAMETOOLONG;
3789
3790 if (len > NFS4_MAXPATHLEN)
3791 goto out;
3792
3793 status = -ENOMEM;
3794 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3795 if (data == NULL)
3796 goto out;
3797
3798 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3799 data->arg.u.symlink.pages = &page;
3800 data->arg.u.symlink.len = len;
3801 data->arg.label = label;
3802
3803 status = nfs4_do_create(dir, dentry, data);
3804
3805 nfs4_free_createdata(data);
3806out:
3807 return status;
3808}
3809
3810static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3811 struct page *page, unsigned int len, struct iattr *sattr)
3812{
3813 struct nfs4_exception exception = { };
3814 struct nfs4_label l, *label = NULL;
3815 int err;
3816
3817 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3818
3819 do {
3820 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3821 trace_nfs4_symlink(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 return err;
3828}
3829
3830static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3831 struct iattr *sattr, struct nfs4_label *label)
3832{
3833 struct nfs4_createdata *data;
3834 int status = -ENOMEM;
3835
3836 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3837 if (data == NULL)
3838 goto out;
3839
3840 data->arg.label = label;
3841 status = nfs4_do_create(dir, dentry, data);
3842
3843 nfs4_free_createdata(data);
3844out:
3845 return status;
3846}
3847
3848static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3849 struct iattr *sattr)
3850{
3851 struct nfs4_exception exception = { };
3852 struct nfs4_label l, *label = NULL;
3853 int err;
3854
3855 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3856
3857 sattr->ia_mode &= ~current_umask();
3858 do {
3859 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3860 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3861 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3862 &exception);
3863 } while (exception.retry);
3864 nfs4_label_release_security(label);
3865
3866 return err;
3867}
3868
3869static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3870 u64 cookie, struct page **pages, unsigned int count, int plus)
3871{
3872 struct inode *dir = dentry->d_inode;
3873 struct nfs4_readdir_arg args = {
3874 .fh = NFS_FH(dir),
3875 .pages = pages,
3876 .pgbase = 0,
3877 .count = count,
3878 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3879 .plus = plus,
3880 };
3881 struct nfs4_readdir_res res;
3882 struct rpc_message msg = {
3883 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3884 .rpc_argp = &args,
3885 .rpc_resp = &res,
3886 .rpc_cred = cred,
3887 };
3888 int status;
3889
3890 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3891 dentry,
3892 (unsigned long long)cookie);
3893 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3894 res.pgbase = args.pgbase;
3895 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3896 if (status >= 0) {
3897 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3898 status += args.pgbase;
3899 }
3900
3901 nfs_invalidate_atime(dir);
3902
3903 dprintk("%s: returns %d\n", __func__, status);
3904 return status;
3905}
3906
3907static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3908 u64 cookie, struct page **pages, unsigned int count, int plus)
3909{
3910 struct nfs4_exception exception = { };
3911 int err;
3912 do {
3913 err = _nfs4_proc_readdir(dentry, cred, cookie,
3914 pages, count, plus);
3915 trace_nfs4_readdir(dentry->d_inode, err);
3916 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3917 &exception);
3918 } while (exception.retry);
3919 return err;
3920}
3921
3922static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3923 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3924{
3925 struct nfs4_createdata *data;
3926 int mode = sattr->ia_mode;
3927 int status = -ENOMEM;
3928
3929 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3930 if (data == NULL)
3931 goto out;
3932
3933 if (S_ISFIFO(mode))
3934 data->arg.ftype = NF4FIFO;
3935 else if (S_ISBLK(mode)) {
3936 data->arg.ftype = NF4BLK;
3937 data->arg.u.device.specdata1 = MAJOR(rdev);
3938 data->arg.u.device.specdata2 = MINOR(rdev);
3939 }
3940 else if (S_ISCHR(mode)) {
3941 data->arg.ftype = NF4CHR;
3942 data->arg.u.device.specdata1 = MAJOR(rdev);
3943 data->arg.u.device.specdata2 = MINOR(rdev);
3944 } else if (!S_ISSOCK(mode)) {
3945 status = -EINVAL;
3946 goto out_free;
3947 }
3948
3949 data->arg.label = label;
3950 status = nfs4_do_create(dir, dentry, data);
3951out_free:
3952 nfs4_free_createdata(data);
3953out:
3954 return status;
3955}
3956
3957static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3958 struct iattr *sattr, dev_t rdev)
3959{
3960 struct nfs4_exception exception = { };
3961 struct nfs4_label l, *label = NULL;
3962 int err;
3963
3964 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3965
3966 sattr->ia_mode &= ~current_umask();
3967 do {
3968 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3969 trace_nfs4_mknod(dir, &dentry->d_name, err);
3970 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3971 &exception);
3972 } while (exception.retry);
3973
3974 nfs4_label_release_security(label);
3975
3976 return err;
3977}
3978
3979static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3980 struct nfs_fsstat *fsstat)
3981{
3982 struct nfs4_statfs_arg args = {
3983 .fh = fhandle,
3984 .bitmask = server->attr_bitmask,
3985 };
3986 struct nfs4_statfs_res res = {
3987 .fsstat = fsstat,
3988 };
3989 struct rpc_message msg = {
3990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3991 .rpc_argp = &args,
3992 .rpc_resp = &res,
3993 };
3994
3995 nfs_fattr_init(fsstat->fattr);
3996 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3997}
3998
3999static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4000{
4001 struct nfs4_exception exception = { };
4002 int err;
4003 do {
4004 err = nfs4_handle_exception(server,
4005 _nfs4_proc_statfs(server, fhandle, fsstat),
4006 &exception);
4007 } while (exception.retry);
4008 return err;
4009}
4010
4011static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4012 struct nfs_fsinfo *fsinfo)
4013{
4014 struct nfs4_fsinfo_arg args = {
4015 .fh = fhandle,
4016 .bitmask = server->attr_bitmask,
4017 };
4018 struct nfs4_fsinfo_res res = {
4019 .fsinfo = fsinfo,
4020 };
4021 struct rpc_message msg = {
4022 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4023 .rpc_argp = &args,
4024 .rpc_resp = &res,
4025 };
4026
4027 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4028}
4029
4030static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4031{
4032 struct nfs4_exception exception = { };
4033 unsigned long now = jiffies;
4034 int err;
4035
4036 do {
4037 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4038 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4039 if (err == 0) {
4040 struct nfs_client *clp = server->nfs_client;
4041
4042 spin_lock(&clp->cl_lock);
4043 clp->cl_lease_time = fsinfo->lease_time * HZ;
4044 clp->cl_last_renewal = now;
4045 spin_unlock(&clp->cl_lock);
4046 break;
4047 }
4048 err = nfs4_handle_exception(server, err, &exception);
4049 } while (exception.retry);
4050 return err;
4051}
4052
4053static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4054{
4055 int error;
4056
4057 nfs_fattr_init(fsinfo->fattr);
4058 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4059 if (error == 0) {
4060 /* block layout checks this! */
4061 server->pnfs_blksize = fsinfo->blksize;
4062 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4063 }
4064
4065 return error;
4066}
4067
4068static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4069 struct nfs_pathconf *pathconf)
4070{
4071 struct nfs4_pathconf_arg args = {
4072 .fh = fhandle,
4073 .bitmask = server->attr_bitmask,
4074 };
4075 struct nfs4_pathconf_res res = {
4076 .pathconf = pathconf,
4077 };
4078 struct rpc_message msg = {
4079 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4080 .rpc_argp = &args,
4081 .rpc_resp = &res,
4082 };
4083
4084 /* None of the pathconf attributes are mandatory to implement */
4085 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4086 memset(pathconf, 0, sizeof(*pathconf));
4087 return 0;
4088 }
4089
4090 nfs_fattr_init(pathconf->fattr);
4091 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4092}
4093
4094static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4095 struct nfs_pathconf *pathconf)
4096{
4097 struct nfs4_exception exception = { };
4098 int err;
4099
4100 do {
4101 err = nfs4_handle_exception(server,
4102 _nfs4_proc_pathconf(server, fhandle, pathconf),
4103 &exception);
4104 } while (exception.retry);
4105 return err;
4106}
4107
4108int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4109 const struct nfs_open_context *ctx,
4110 const struct nfs_lock_context *l_ctx,
4111 fmode_t fmode)
4112{
4113 const struct nfs_lockowner *lockowner = NULL;
4114
4115 if (l_ctx != NULL)
4116 lockowner = &l_ctx->lockowner;
4117 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4118}
4119EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4120
4121static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4122 const struct nfs_open_context *ctx,
4123 const struct nfs_lock_context *l_ctx,
4124 fmode_t fmode)
4125{
4126 nfs4_stateid current_stateid;
4127
4128 /* If the current stateid represents a lost lock, then exit */
4129 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4130 return true;
4131 return nfs4_stateid_match(stateid, &current_stateid);
4132}
4133
4134static bool nfs4_error_stateid_expired(int err)
4135{
4136 switch (err) {
4137 case -NFS4ERR_DELEG_REVOKED:
4138 case -NFS4ERR_ADMIN_REVOKED:
4139 case -NFS4ERR_BAD_STATEID:
4140 case -NFS4ERR_STALE_STATEID:
4141 case -NFS4ERR_OLD_STATEID:
4142 case -NFS4ERR_OPENMODE:
4143 case -NFS4ERR_EXPIRED:
4144 return true;
4145 }
4146 return false;
4147}
4148
4149void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4150{
4151 nfs_invalidate_atime(hdr->inode);
4152}
4153
4154static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4155{
4156 struct nfs_server *server = NFS_SERVER(hdr->inode);
4157
4158 trace_nfs4_read(hdr, task->tk_status);
4159 if (nfs4_async_handle_error(task, server,
4160 hdr->args.context->state,
4161 NULL) == -EAGAIN) {
4162 rpc_restart_call_prepare(task);
4163 return -EAGAIN;
4164 }
4165
4166 __nfs4_read_done_cb(hdr);
4167 if (task->tk_status > 0)
4168 renew_lease(server, hdr->timestamp);
4169 return 0;
4170}
4171
4172static bool nfs4_read_stateid_changed(struct rpc_task *task,
4173 struct nfs_pgio_args *args)
4174{
4175
4176 if (!nfs4_error_stateid_expired(task->tk_status) ||
4177 nfs4_stateid_is_current(&args->stateid,
4178 args->context,
4179 args->lock_context,
4180 FMODE_READ))
4181 return false;
4182 rpc_restart_call_prepare(task);
4183 return true;
4184}
4185
4186static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4187{
4188
4189 dprintk("--> %s\n", __func__);
4190
4191 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4192 return -EAGAIN;
4193 if (nfs4_read_stateid_changed(task, &hdr->args))
4194 return -EAGAIN;
4195 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4196 nfs4_read_done_cb(task, hdr);
4197}
4198
4199static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4200 struct rpc_message *msg)
4201{
4202 hdr->timestamp = jiffies;
4203 hdr->pgio_done_cb = nfs4_read_done_cb;
4204 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4205 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4206}
4207
4208static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4209 struct nfs_pgio_header *hdr)
4210{
4211 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4212 &hdr->args.seq_args,
4213 &hdr->res.seq_res,
4214 task))
4215 return 0;
4216 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4217 hdr->args.lock_context,
4218 hdr->rw_ops->rw_mode) == -EIO)
4219 return -EIO;
4220 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4221 return -EIO;
4222 return 0;
4223}
4224
4225static int nfs4_write_done_cb(struct rpc_task *task,
4226 struct nfs_pgio_header *hdr)
4227{
4228 struct inode *inode = hdr->inode;
4229
4230 trace_nfs4_write(hdr, task->tk_status);
4231 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4232 hdr->args.context->state,
4233 NULL) == -EAGAIN) {
4234 rpc_restart_call_prepare(task);
4235 return -EAGAIN;
4236 }
4237 if (task->tk_status >= 0) {
4238 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4239 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4240 }
4241 return 0;
4242}
4243
4244static bool nfs4_write_stateid_changed(struct rpc_task *task,
4245 struct nfs_pgio_args *args)
4246{
4247
4248 if (!nfs4_error_stateid_expired(task->tk_status) ||
4249 nfs4_stateid_is_current(&args->stateid,
4250 args->context,
4251 args->lock_context,
4252 FMODE_WRITE))
4253 return false;
4254 rpc_restart_call_prepare(task);
4255 return true;
4256}
4257
4258static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4259{
4260 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4261 return -EAGAIN;
4262 if (nfs4_write_stateid_changed(task, &hdr->args))
4263 return -EAGAIN;
4264 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4265 nfs4_write_done_cb(task, hdr);
4266}
4267
4268static
4269bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4270{
4271 /* Don't request attributes for pNFS or O_DIRECT writes */
4272 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4273 return false;
4274 /* Otherwise, request attributes if and only if we don't hold
4275 * a delegation
4276 */
4277 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4278}
4279
4280static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4281 struct rpc_message *msg)
4282{
4283 struct nfs_server *server = NFS_SERVER(hdr->inode);
4284
4285 if (!nfs4_write_need_cache_consistency_data(hdr)) {
4286 hdr->args.bitmask = NULL;
4287 hdr->res.fattr = NULL;
4288 } else
4289 hdr->args.bitmask = server->cache_consistency_bitmask;
4290
4291 if (!hdr->pgio_done_cb)
4292 hdr->pgio_done_cb = nfs4_write_done_cb;
4293 hdr->res.server = server;
4294 hdr->timestamp = jiffies;
4295
4296 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4297 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4298}
4299
4300static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4301{
4302 nfs4_setup_sequence(NFS_SERVER(data->inode),
4303 &data->args.seq_args,
4304 &data->res.seq_res,
4305 task);
4306}
4307
4308static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4309{
4310 struct inode *inode = data->inode;
4311
4312 trace_nfs4_commit(data, task->tk_status);
4313 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4314 NULL, NULL) == -EAGAIN) {
4315 rpc_restart_call_prepare(task);
4316 return -EAGAIN;
4317 }
4318 return 0;
4319}
4320
4321static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4322{
4323 if (!nfs4_sequence_done(task, &data->res.seq_res))
4324 return -EAGAIN;
4325 return data->commit_done_cb(task, data);
4326}
4327
4328static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4329{
4330 struct nfs_server *server = NFS_SERVER(data->inode);
4331
4332 if (data->commit_done_cb == NULL)
4333 data->commit_done_cb = nfs4_commit_done_cb;
4334 data->res.server = server;
4335 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4336 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4337}
4338
4339struct nfs4_renewdata {
4340 struct nfs_client *client;
4341 unsigned long timestamp;
4342};
4343
4344/*
4345 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4346 * standalone procedure for queueing an asynchronous RENEW.
4347 */
4348static void nfs4_renew_release(void *calldata)
4349{
4350 struct nfs4_renewdata *data = calldata;
4351 struct nfs_client *clp = data->client;
4352
4353 if (atomic_read(&clp->cl_count) > 1)
4354 nfs4_schedule_state_renewal(clp);
4355 nfs_put_client(clp);
4356 kfree(data);
4357}
4358
4359static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4360{
4361 struct nfs4_renewdata *data = calldata;
4362 struct nfs_client *clp = data->client;
4363 unsigned long timestamp = data->timestamp;
4364
4365 trace_nfs4_renew_async(clp, task->tk_status);
4366 switch (task->tk_status) {
4367 case 0:
4368 break;
4369 case -NFS4ERR_LEASE_MOVED:
4370 nfs4_schedule_lease_moved_recovery(clp);
4371 break;
4372 default:
4373 /* Unless we're shutting down, schedule state recovery! */
4374 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4375 return;
4376 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4377 nfs4_schedule_lease_recovery(clp);
4378 return;
4379 }
4380 nfs4_schedule_path_down_recovery(clp);
4381 }
4382 do_renew_lease(clp, timestamp);
4383}
4384
4385static const struct rpc_call_ops nfs4_renew_ops = {
4386 .rpc_call_done = nfs4_renew_done,
4387 .rpc_release = nfs4_renew_release,
4388};
4389
4390static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4391{
4392 struct rpc_message msg = {
4393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4394 .rpc_argp = clp,
4395 .rpc_cred = cred,
4396 };
4397 struct nfs4_renewdata *data;
4398
4399 if (renew_flags == 0)
4400 return 0;
4401 if (!atomic_inc_not_zero(&clp->cl_count))
4402 return -EIO;
4403 data = kmalloc(sizeof(*data), GFP_NOFS);
4404 if (data == NULL)
4405 return -ENOMEM;
4406 data->client = clp;
4407 data->timestamp = jiffies;
4408 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4409 &nfs4_renew_ops, data);
4410}
4411
4412static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4413{
4414 struct rpc_message msg = {
4415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4416 .rpc_argp = clp,
4417 .rpc_cred = cred,
4418 };
4419 unsigned long now = jiffies;
4420 int status;
4421
4422 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4423 if (status < 0)
4424 return status;
4425 do_renew_lease(clp, now);
4426 return 0;
4427}
4428
4429static inline int nfs4_server_supports_acls(struct nfs_server *server)
4430{
4431 return server->caps & NFS_CAP_ACLS;
4432}
4433
4434/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4435 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4436 * the stack.
4437 */
4438#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4439
4440static int buf_to_pages_noslab(const void *buf, size_t buflen,
4441 struct page **pages, unsigned int *pgbase)
4442{
4443 struct page *newpage, **spages;
4444 int rc = 0;
4445 size_t len;
4446 spages = pages;
4447
4448 do {
4449 len = min_t(size_t, PAGE_SIZE, buflen);
4450 newpage = alloc_page(GFP_KERNEL);
4451
4452 if (newpage == NULL)
4453 goto unwind;
4454 memcpy(page_address(newpage), buf, len);
4455 buf += len;
4456 buflen -= len;
4457 *pages++ = newpage;
4458 rc++;
4459 } while (buflen != 0);
4460
4461 return rc;
4462
4463unwind:
4464 for(; rc > 0; rc--)
4465 __free_page(spages[rc-1]);
4466 return -ENOMEM;
4467}
4468
4469struct nfs4_cached_acl {
4470 int cached;
4471 size_t len;
4472 char data[0];
4473};
4474
4475static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4476{
4477 struct nfs_inode *nfsi = NFS_I(inode);
4478
4479 spin_lock(&inode->i_lock);
4480 kfree(nfsi->nfs4_acl);
4481 nfsi->nfs4_acl = acl;
4482 spin_unlock(&inode->i_lock);
4483}
4484
4485static void nfs4_zap_acl_attr(struct inode *inode)
4486{
4487 nfs4_set_cached_acl(inode, NULL);
4488}
4489
4490static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4491{
4492 struct nfs_inode *nfsi = NFS_I(inode);
4493 struct nfs4_cached_acl *acl;
4494 int ret = -ENOENT;
4495
4496 spin_lock(&inode->i_lock);
4497 acl = nfsi->nfs4_acl;
4498 if (acl == NULL)
4499 goto out;
4500 if (buf == NULL) /* user is just asking for length */
4501 goto out_len;
4502 if (acl->cached == 0)
4503 goto out;
4504 ret = -ERANGE; /* see getxattr(2) man page */
4505 if (acl->len > buflen)
4506 goto out;
4507 memcpy(buf, acl->data, acl->len);
4508out_len:
4509 ret = acl->len;
4510out:
4511 spin_unlock(&inode->i_lock);
4512 return ret;
4513}
4514
4515static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4516{
4517 struct nfs4_cached_acl *acl;
4518 size_t buflen = sizeof(*acl) + acl_len;
4519
4520 if (buflen <= PAGE_SIZE) {
4521 acl = kmalloc(buflen, GFP_KERNEL);
4522 if (acl == NULL)
4523 goto out;
4524 acl->cached = 1;
4525 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4526 } else {
4527 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4528 if (acl == NULL)
4529 goto out;
4530 acl->cached = 0;
4531 }
4532 acl->len = acl_len;
4533out:
4534 nfs4_set_cached_acl(inode, acl);
4535}
4536
4537/*
4538 * The getxattr API returns the required buffer length when called with a
4539 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4540 * the required buf. On a NULL buf, we send a page of data to the server
4541 * guessing that the ACL request can be serviced by a page. If so, we cache
4542 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4543 * the cache. If not so, we throw away the page, and cache the required
4544 * length. The next getxattr call will then produce another round trip to
4545 * the server, this time with the input buf of the required size.
4546 */
4547static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4548{
4549 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4550 struct nfs_getaclargs args = {
4551 .fh = NFS_FH(inode),
4552 .acl_pages = pages,
4553 .acl_len = buflen,
4554 };
4555 struct nfs_getaclres res = {
4556 .acl_len = buflen,
4557 };
4558 struct rpc_message msg = {
4559 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4560 .rpc_argp = &args,
4561 .rpc_resp = &res,
4562 };
4563 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4564 int ret = -ENOMEM, i;
4565
4566 /* As long as we're doing a round trip to the server anyway,
4567 * let's be prepared for a page of acl data. */
4568 if (npages == 0)
4569 npages = 1;
4570 if (npages > ARRAY_SIZE(pages))
4571 return -ERANGE;
4572
4573 for (i = 0; i < npages; i++) {
4574 pages[i] = alloc_page(GFP_KERNEL);
4575 if (!pages[i])
4576 goto out_free;
4577 }
4578
4579 /* for decoding across pages */
4580 res.acl_scratch = alloc_page(GFP_KERNEL);
4581 if (!res.acl_scratch)
4582 goto out_free;
4583
4584 args.acl_len = npages * PAGE_SIZE;
4585 args.acl_pgbase = 0;
4586
4587 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4588 __func__, buf, buflen, npages, args.acl_len);
4589 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4590 &msg, &args.seq_args, &res.seq_res, 0);
4591 if (ret)
4592 goto out_free;
4593
4594 /* Handle the case where the passed-in buffer is too short */
4595 if (res.acl_flags & NFS4_ACL_TRUNC) {
4596 /* Did the user only issue a request for the acl length? */
4597 if (buf == NULL)
4598 goto out_ok;
4599 ret = -ERANGE;
4600 goto out_free;
4601 }
4602 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4603 if (buf) {
4604 if (res.acl_len > buflen) {
4605 ret = -ERANGE;
4606 goto out_free;
4607 }
4608 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4609 }
4610out_ok:
4611 ret = res.acl_len;
4612out_free:
4613 for (i = 0; i < npages; i++)
4614 if (pages[i])
4615 __free_page(pages[i]);
4616 if (res.acl_scratch)
4617 __free_page(res.acl_scratch);
4618 return ret;
4619}
4620
4621static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4622{
4623 struct nfs4_exception exception = { };
4624 ssize_t ret;
4625 do {
4626 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4627 trace_nfs4_get_acl(inode, ret);
4628 if (ret >= 0)
4629 break;
4630 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4631 } while (exception.retry);
4632 return ret;
4633}
4634
4635static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4636{
4637 struct nfs_server *server = NFS_SERVER(inode);
4638 int ret;
4639
4640 if (!nfs4_server_supports_acls(server))
4641 return -EOPNOTSUPP;
4642 ret = nfs_revalidate_inode(server, inode);
4643 if (ret < 0)
4644 return ret;
4645 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4646 nfs_zap_acl_cache(inode);
4647 ret = nfs4_read_cached_acl(inode, buf, buflen);
4648 if (ret != -ENOENT)
4649 /* -ENOENT is returned if there is no ACL or if there is an ACL
4650 * but no cached acl data, just the acl length */
4651 return ret;
4652 return nfs4_get_acl_uncached(inode, buf, buflen);
4653}
4654
4655static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4656{
4657 struct nfs_server *server = NFS_SERVER(inode);
4658 struct page *pages[NFS4ACL_MAXPAGES];
4659 struct nfs_setaclargs arg = {
4660 .fh = NFS_FH(inode),
4661 .acl_pages = pages,
4662 .acl_len = buflen,
4663 };
4664 struct nfs_setaclres res;
4665 struct rpc_message msg = {
4666 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4667 .rpc_argp = &arg,
4668 .rpc_resp = &res,
4669 };
4670 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4671 int ret, i;
4672
4673 if (!nfs4_server_supports_acls(server))
4674 return -EOPNOTSUPP;
4675 if (npages > ARRAY_SIZE(pages))
4676 return -ERANGE;
4677 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4678 if (i < 0)
4679 return i;
4680 nfs4_inode_return_delegation(inode);
4681 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4682
4683 /*
4684 * Free each page after tx, so the only ref left is
4685 * held by the network stack
4686 */
4687 for (; i > 0; i--)
4688 put_page(pages[i-1]);
4689
4690 /*
4691 * Acl update can result in inode attribute update.
4692 * so mark the attribute cache invalid.
4693 */
4694 spin_lock(&inode->i_lock);
4695 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4696 spin_unlock(&inode->i_lock);
4697 nfs_access_zap_cache(inode);
4698 nfs_zap_acl_cache(inode);
4699 return ret;
4700}
4701
4702static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4703{
4704 struct nfs4_exception exception = { };
4705 int err;
4706 do {
4707 err = __nfs4_proc_set_acl(inode, buf, buflen);
4708 trace_nfs4_set_acl(inode, err);
4709 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4710 &exception);
4711 } while (exception.retry);
4712 return err;
4713}
4714
4715#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4716static int _nfs4_get_security_label(struct inode *inode, void *buf,
4717 size_t buflen)
4718{
4719 struct nfs_server *server = NFS_SERVER(inode);
4720 struct nfs_fattr fattr;
4721 struct nfs4_label label = {0, 0, buflen, buf};
4722
4723 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4724 struct nfs4_getattr_arg arg = {
4725 .fh = NFS_FH(inode),
4726 .bitmask = bitmask,
4727 };
4728 struct nfs4_getattr_res res = {
4729 .fattr = &fattr,
4730 .label = &label,
4731 .server = server,
4732 };
4733 struct rpc_message msg = {
4734 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4735 .rpc_argp = &arg,
4736 .rpc_resp = &res,
4737 };
4738 int ret;
4739
4740 nfs_fattr_init(&fattr);
4741
4742 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4743 if (ret)
4744 return ret;
4745 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4746 return -ENOENT;
4747 if (buflen < label.len)
4748 return -ERANGE;
4749 return 0;
4750}
4751
4752static int nfs4_get_security_label(struct inode *inode, void *buf,
4753 size_t buflen)
4754{
4755 struct nfs4_exception exception = { };
4756 int err;
4757
4758 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4759 return -EOPNOTSUPP;
4760
4761 do {
4762 err = _nfs4_get_security_label(inode, buf, buflen);
4763 trace_nfs4_get_security_label(inode, err);
4764 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4765 &exception);
4766 } while (exception.retry);
4767 return err;
4768}
4769
4770static int _nfs4_do_set_security_label(struct inode *inode,
4771 struct nfs4_label *ilabel,
4772 struct nfs_fattr *fattr,
4773 struct nfs4_label *olabel)
4774{
4775
4776 struct iattr sattr = {0};
4777 struct nfs_server *server = NFS_SERVER(inode);
4778 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4779 struct nfs_setattrargs arg = {
4780 .fh = NFS_FH(inode),
4781 .iap = &sattr,
4782 .server = server,
4783 .bitmask = bitmask,
4784 .label = ilabel,
4785 };
4786 struct nfs_setattrres res = {
4787 .fattr = fattr,
4788 .label = olabel,
4789 .server = server,
4790 };
4791 struct rpc_message msg = {
4792 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4793 .rpc_argp = &arg,
4794 .rpc_resp = &res,
4795 };
4796 int status;
4797
4798 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4799
4800 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4801 if (status)
4802 dprintk("%s failed: %d\n", __func__, status);
4803
4804 return status;
4805}
4806
4807static int nfs4_do_set_security_label(struct inode *inode,
4808 struct nfs4_label *ilabel,
4809 struct nfs_fattr *fattr,
4810 struct nfs4_label *olabel)
4811{
4812 struct nfs4_exception exception = { };
4813 int err;
4814
4815 do {
4816 err = _nfs4_do_set_security_label(inode, ilabel,
4817 fattr, olabel);
4818 trace_nfs4_set_security_label(inode, err);
4819 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4820 &exception);
4821 } while (exception.retry);
4822 return err;
4823}
4824
4825static int
4826nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4827{
4828 struct nfs4_label ilabel, *olabel = NULL;
4829 struct nfs_fattr fattr;
4830 struct rpc_cred *cred;
4831 struct inode *inode = dentry->d_inode;
4832 int status;
4833
4834 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4835 return -EOPNOTSUPP;
4836
4837 nfs_fattr_init(&fattr);
4838
4839 ilabel.pi = 0;
4840 ilabel.lfs = 0;
4841 ilabel.label = (char *)buf;
4842 ilabel.len = buflen;
4843
4844 cred = rpc_lookup_cred();
4845 if (IS_ERR(cred))
4846 return PTR_ERR(cred);
4847
4848 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4849 if (IS_ERR(olabel)) {
4850 status = -PTR_ERR(olabel);
4851 goto out;
4852 }
4853
4854 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4855 if (status == 0)
4856 nfs_setsecurity(inode, &fattr, olabel);
4857
4858 nfs4_label_free(olabel);
4859out:
4860 put_rpccred(cred);
4861 return status;
4862}
4863#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4864
4865
4866static int
4867nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4868 struct nfs4_state *state, long *timeout)
4869{
4870 struct nfs_client *clp = server->nfs_client;
4871
4872 if (task->tk_status >= 0)
4873 return 0;
4874 switch(task->tk_status) {
4875 case -NFS4ERR_DELEG_REVOKED:
4876 case -NFS4ERR_ADMIN_REVOKED:
4877 case -NFS4ERR_BAD_STATEID:
4878 case -NFS4ERR_OPENMODE:
4879 if (state == NULL)
4880 break;
4881 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4882 goto recovery_failed;
4883 goto wait_on_recovery;
4884 case -NFS4ERR_EXPIRED:
4885 if (state != NULL) {
4886 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4887 goto recovery_failed;
4888 }
4889 case -NFS4ERR_STALE_STATEID:
4890 case -NFS4ERR_STALE_CLIENTID:
4891 nfs4_schedule_lease_recovery(clp);
4892 goto wait_on_recovery;
4893 case -NFS4ERR_MOVED:
4894 if (nfs4_schedule_migration_recovery(server) < 0)
4895 goto recovery_failed;
4896 goto wait_on_recovery;
4897 case -NFS4ERR_LEASE_MOVED:
4898 nfs4_schedule_lease_moved_recovery(clp);
4899 goto wait_on_recovery;
4900#if defined(CONFIG_NFS_V4_1)
4901 case -NFS4ERR_BADSESSION:
4902 case -NFS4ERR_BADSLOT:
4903 case -NFS4ERR_BAD_HIGH_SLOT:
4904 case -NFS4ERR_DEADSESSION:
4905 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4906 case -NFS4ERR_SEQ_FALSE_RETRY:
4907 case -NFS4ERR_SEQ_MISORDERED:
4908 dprintk("%s ERROR %d, Reset session\n", __func__,
4909 task->tk_status);
4910 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4911 goto wait_on_recovery;
4912#endif /* CONFIG_NFS_V4_1 */
4913 case -NFS4ERR_DELAY:
4914 nfs_inc_server_stats(server, NFSIOS_DELAY);
4915 rpc_delay(task, nfs4_update_delay(timeout));
4916 goto restart_call;
4917 case -NFS4ERR_GRACE:
4918 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4919 case -NFS4ERR_RETRY_UNCACHED_REP:
4920 case -NFS4ERR_OLD_STATEID:
4921 goto restart_call;
4922 }
4923 task->tk_status = nfs4_map_errors(task->tk_status);
4924 return 0;
4925recovery_failed:
4926 task->tk_status = -EIO;
4927 return 0;
4928wait_on_recovery:
4929 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4930 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4931 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4932 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4933 goto recovery_failed;
4934restart_call:
4935 task->tk_status = 0;
4936 return -EAGAIN;
4937}
4938
4939static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4940 nfs4_verifier *bootverf)
4941{
4942 __be32 verf[2];
4943
4944 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4945 /* An impossible timestamp guarantees this value
4946 * will never match a generated boot time. */
4947 verf[0] = 0;
4948 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4949 } else {
4950 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4951 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4952 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4953 }
4954 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4955}
4956
4957static unsigned int
4958nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4959 char *buf, size_t len)
4960{
4961 unsigned int result;
4962
4963 if (clp->cl_owner_id != NULL)
4964 return strlcpy(buf, clp->cl_owner_id, len);
4965
4966 rcu_read_lock();
4967 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4968 clp->cl_ipaddr,
4969 rpc_peeraddr2str(clp->cl_rpcclient,
4970 RPC_DISPLAY_ADDR),
4971 rpc_peeraddr2str(clp->cl_rpcclient,
4972 RPC_DISPLAY_PROTO));
4973 rcu_read_unlock();
4974 clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4975 return result;
4976}
4977
4978static unsigned int
4979nfs4_init_uniform_client_string(struct nfs_client *clp,
4980 char *buf, size_t len)
4981{
4982 const char *nodename = clp->cl_rpcclient->cl_nodename;
4983 unsigned int result;
4984
4985 if (clp->cl_owner_id != NULL)
4986 return strlcpy(buf, clp->cl_owner_id, len);
4987
4988 if (nfs4_client_id_uniquifier[0] != '\0')
4989 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4990 clp->rpc_ops->version,
4991 clp->cl_minorversion,
4992 nfs4_client_id_uniquifier,
4993 nodename);
4994 else
4995 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4996 clp->rpc_ops->version, clp->cl_minorversion,
4997 nodename);
4998 clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4999 return result;
5000}
5001
5002/*
5003 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5004 * services. Advertise one based on the address family of the
5005 * clientaddr.
5006 */
5007static unsigned int
5008nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5009{
5010 if (strchr(clp->cl_ipaddr, ':') != NULL)
5011 return scnprintf(buf, len, "tcp6");
5012 else
5013 return scnprintf(buf, len, "tcp");
5014}
5015
5016static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5017{
5018 struct nfs4_setclientid *sc = calldata;
5019
5020 if (task->tk_status == 0)
5021 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5022}
5023
5024static const struct rpc_call_ops nfs4_setclientid_ops = {
5025 .rpc_call_done = nfs4_setclientid_done,
5026};
5027
5028/**
5029 * nfs4_proc_setclientid - Negotiate client ID
5030 * @clp: state data structure
5031 * @program: RPC program for NFSv4 callback service
5032 * @port: IP port number for NFS4 callback service
5033 * @cred: RPC credential to use for this call
5034 * @res: where to place the result
5035 *
5036 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5037 */
5038int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5039 unsigned short port, struct rpc_cred *cred,
5040 struct nfs4_setclientid_res *res)
5041{
5042 nfs4_verifier sc_verifier;
5043 struct nfs4_setclientid setclientid = {
5044 .sc_verifier = &sc_verifier,
5045 .sc_prog = program,
5046 .sc_cb_ident = clp->cl_cb_ident,
5047 };
5048 struct rpc_message msg = {
5049 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5050 .rpc_argp = &setclientid,
5051 .rpc_resp = res,
5052 .rpc_cred = cred,
5053 };
5054 struct rpc_task *task;
5055 struct rpc_task_setup task_setup_data = {
5056 .rpc_client = clp->cl_rpcclient,
5057 .rpc_message = &msg,
5058 .callback_ops = &nfs4_setclientid_ops,
5059 .callback_data = &setclientid,
5060 .flags = RPC_TASK_TIMEOUT,
5061 };
5062 int status;
5063
5064 /* nfs_client_id4 */
5065 nfs4_init_boot_verifier(clp, &sc_verifier);
5066 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5067 setclientid.sc_name_len =
5068 nfs4_init_uniform_client_string(clp,
5069 setclientid.sc_name,
5070 sizeof(setclientid.sc_name));
5071 else
5072 setclientid.sc_name_len =
5073 nfs4_init_nonuniform_client_string(clp,
5074 setclientid.sc_name,
5075 sizeof(setclientid.sc_name));
5076 /* cb_client4 */
5077 setclientid.sc_netid_len =
5078 nfs4_init_callback_netid(clp,
5079 setclientid.sc_netid,
5080 sizeof(setclientid.sc_netid));
5081 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5082 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5083 clp->cl_ipaddr, port >> 8, port & 255);
5084
5085 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
5086 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5087 setclientid.sc_name_len, setclientid.sc_name);
5088 task = rpc_run_task(&task_setup_data);
5089 if (IS_ERR(task)) {
5090 status = PTR_ERR(task);
5091 goto out;
5092 }
5093 status = task->tk_status;
5094 if (setclientid.sc_cred) {
5095 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5096 put_rpccred(setclientid.sc_cred);
5097 }
5098 rpc_put_task(task);
5099out:
5100 trace_nfs4_setclientid(clp, status);
5101 dprintk("NFS reply setclientid: %d\n", status);
5102 return status;
5103}
5104
5105/**
5106 * nfs4_proc_setclientid_confirm - Confirm client ID
5107 * @clp: state data structure
5108 * @res: result of a previous SETCLIENTID
5109 * @cred: RPC credential to use for this call
5110 *
5111 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5112 */
5113int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5114 struct nfs4_setclientid_res *arg,
5115 struct rpc_cred *cred)
5116{
5117 struct rpc_message msg = {
5118 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5119 .rpc_argp = arg,
5120 .rpc_cred = cred,
5121 };
5122 int status;
5123
5124 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5125 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5126 clp->cl_clientid);
5127 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5128 trace_nfs4_setclientid_confirm(clp, status);
5129 dprintk("NFS reply setclientid_confirm: %d\n", status);
5130 return status;
5131}
5132
5133struct nfs4_delegreturndata {
5134 struct nfs4_delegreturnargs args;
5135 struct nfs4_delegreturnres res;
5136 struct nfs_fh fh;
5137 nfs4_stateid stateid;
5138 unsigned long timestamp;
5139 struct nfs_fattr fattr;
5140 int rpc_status;
5141 struct inode *inode;
5142 bool roc;
5143 u32 roc_barrier;
5144};
5145
5146static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5147{
5148 struct nfs4_delegreturndata *data = calldata;
5149
5150 if (!nfs4_sequence_done(task, &data->res.seq_res))
5151 return;
5152
5153 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5154 switch (task->tk_status) {
5155 case 0:
5156 renew_lease(data->res.server, data->timestamp);
5157 case -NFS4ERR_ADMIN_REVOKED:
5158 case -NFS4ERR_DELEG_REVOKED:
5159 case -NFS4ERR_BAD_STATEID:
5160 case -NFS4ERR_OLD_STATEID:
5161 case -NFS4ERR_STALE_STATEID:
5162 case -NFS4ERR_EXPIRED:
5163 task->tk_status = 0;
5164 if (data->roc)
5165 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5166 break;
5167 default:
5168 if (nfs4_async_handle_error(task, data->res.server,
5169 NULL, NULL) == -EAGAIN) {
5170 rpc_restart_call_prepare(task);
5171 return;
5172 }
5173 }
5174 data->rpc_status = task->tk_status;
5175}
5176
5177static void nfs4_delegreturn_release(void *calldata)
5178{
5179 struct nfs4_delegreturndata *data = calldata;
5180
5181 if (data->roc)
5182 pnfs_roc_release(data->inode);
5183 kfree(calldata);
5184}
5185
5186static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5187{
5188 struct nfs4_delegreturndata *d_data;
5189
5190 d_data = (struct nfs4_delegreturndata *)data;
5191
5192 if (d_data->roc &&
5193 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5194 return;
5195
5196 nfs4_setup_sequence(d_data->res.server,
5197 &d_data->args.seq_args,
5198 &d_data->res.seq_res,
5199 task);
5200}
5201
5202static const struct rpc_call_ops nfs4_delegreturn_ops = {
5203 .rpc_call_prepare = nfs4_delegreturn_prepare,
5204 .rpc_call_done = nfs4_delegreturn_done,
5205 .rpc_release = nfs4_delegreturn_release,
5206};
5207
5208static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5209{
5210 struct nfs4_delegreturndata *data;
5211 struct nfs_server *server = NFS_SERVER(inode);
5212 struct rpc_task *task;
5213 struct rpc_message msg = {
5214 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5215 .rpc_cred = cred,
5216 };
5217 struct rpc_task_setup task_setup_data = {
5218 .rpc_client = server->client,
5219 .rpc_message = &msg,
5220 .callback_ops = &nfs4_delegreturn_ops,
5221 .flags = RPC_TASK_ASYNC,
5222 };
5223 int status = 0;
5224
5225 data = kzalloc(sizeof(*data), GFP_NOFS);
5226 if (data == NULL)
5227 return -ENOMEM;
5228 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5229 data->args.fhandle = &data->fh;
5230 data->args.stateid = &data->stateid;
5231 data->args.bitmask = server->cache_consistency_bitmask;
5232 nfs_copy_fh(&data->fh, NFS_FH(inode));
5233 nfs4_stateid_copy(&data->stateid, stateid);
5234 data->res.fattr = &data->fattr;
5235 data->res.server = server;
5236 nfs_fattr_init(data->res.fattr);
5237 data->timestamp = jiffies;
5238 data->rpc_status = 0;
5239 data->inode = inode;
5240 data->roc = list_empty(&NFS_I(inode)->open_files) ?
5241 pnfs_roc(inode) : false;
5242
5243 task_setup_data.callback_data = data;
5244 msg.rpc_argp = &data->args;
5245 msg.rpc_resp = &data->res;
5246 task = rpc_run_task(&task_setup_data);
5247 if (IS_ERR(task))
5248 return PTR_ERR(task);
5249 if (!issync)
5250 goto out;
5251 status = nfs4_wait_for_completion_rpc_task(task);
5252 if (status != 0)
5253 goto out;
5254 status = data->rpc_status;
5255 if (status == 0)
5256 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5257 else
5258 nfs_refresh_inode(inode, &data->fattr);
5259out:
5260 rpc_put_task(task);
5261 return status;
5262}
5263
5264int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5265{
5266 struct nfs_server *server = NFS_SERVER(inode);
5267 struct nfs4_exception exception = { };
5268 int err;
5269 do {
5270 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5271 trace_nfs4_delegreturn(inode, err);
5272 switch (err) {
5273 case -NFS4ERR_STALE_STATEID:
5274 case -NFS4ERR_EXPIRED:
5275 case 0:
5276 return 0;
5277 }
5278 err = nfs4_handle_exception(server, err, &exception);
5279 } while (exception.retry);
5280 return err;
5281}
5282
5283#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5284#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5285
5286/*
5287 * sleep, with exponential backoff, and retry the LOCK operation.
5288 */
5289static unsigned long
5290nfs4_set_lock_task_retry(unsigned long timeout)
5291{
5292 freezable_schedule_timeout_killable_unsafe(timeout);
5293 timeout <<= 1;
5294 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5295 return NFS4_LOCK_MAXTIMEOUT;
5296 return timeout;
5297}
5298
5299static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5300{
5301 struct inode *inode = state->inode;
5302 struct nfs_server *server = NFS_SERVER(inode);
5303 struct nfs_client *clp = server->nfs_client;
5304 struct nfs_lockt_args arg = {
5305 .fh = NFS_FH(inode),
5306 .fl = request,
5307 };
5308 struct nfs_lockt_res res = {
5309 .denied = request,
5310 };
5311 struct rpc_message msg = {
5312 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5313 .rpc_argp = &arg,
5314 .rpc_resp = &res,
5315 .rpc_cred = state->owner->so_cred,
5316 };
5317 struct nfs4_lock_state *lsp;
5318 int status;
5319
5320 arg.lock_owner.clientid = clp->cl_clientid;
5321 status = nfs4_set_lock_state(state, request);
5322 if (status != 0)
5323 goto out;
5324 lsp = request->fl_u.nfs4_fl.owner;
5325 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5326 arg.lock_owner.s_dev = server->s_dev;
5327 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5328 switch (status) {
5329 case 0:
5330 request->fl_type = F_UNLCK;
5331 break;
5332 case -NFS4ERR_DENIED:
5333 status = 0;
5334 }
5335 request->fl_ops->fl_release_private(request);
5336 request->fl_ops = NULL;
5337out:
5338 return status;
5339}
5340
5341static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5342{
5343 struct nfs4_exception exception = { };
5344 int err;
5345
5346 do {
5347 err = _nfs4_proc_getlk(state, cmd, request);
5348 trace_nfs4_get_lock(request, state, cmd, err);
5349 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5350 &exception);
5351 } while (exception.retry);
5352 return err;
5353}
5354
5355static int do_vfs_lock(struct file *file, struct file_lock *fl)
5356{
5357 int res = 0;
5358 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5359 case FL_POSIX:
5360 res = posix_lock_file_wait(file, fl);
5361 break;
5362 case FL_FLOCK:
5363 res = flock_lock_file_wait(file, fl);
5364 break;
5365 default:
5366 BUG();
5367 }
5368 return res;
5369}
5370
5371struct nfs4_unlockdata {
5372 struct nfs_locku_args arg;
5373 struct nfs_locku_res res;
5374 struct nfs4_lock_state *lsp;
5375 struct nfs_open_context *ctx;
5376 struct file_lock fl;
5377 const struct nfs_server *server;
5378 unsigned long timestamp;
5379};
5380
5381static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5382 struct nfs_open_context *ctx,
5383 struct nfs4_lock_state *lsp,
5384 struct nfs_seqid *seqid)
5385{
5386 struct nfs4_unlockdata *p;
5387 struct inode *inode = lsp->ls_state->inode;
5388
5389 p = kzalloc(sizeof(*p), GFP_NOFS);
5390 if (p == NULL)
5391 return NULL;
5392 p->arg.fh = NFS_FH(inode);
5393 p->arg.fl = &p->fl;
5394 p->arg.seqid = seqid;
5395 p->res.seqid = seqid;
5396 p->lsp = lsp;
5397 atomic_inc(&lsp->ls_count);
5398 /* Ensure we don't close file until we're done freeing locks! */
5399 p->ctx = get_nfs_open_context(ctx);
5400 memcpy(&p->fl, fl, sizeof(p->fl));
5401 p->server = NFS_SERVER(inode);
5402 return p;
5403}
5404
5405static void nfs4_locku_release_calldata(void *data)
5406{
5407 struct nfs4_unlockdata *calldata = data;
5408 nfs_free_seqid(calldata->arg.seqid);
5409 nfs4_put_lock_state(calldata->lsp);
5410 put_nfs_open_context(calldata->ctx);
5411 kfree(calldata);
5412}
5413
5414static void nfs4_locku_done(struct rpc_task *task, void *data)
5415{
5416 struct nfs4_unlockdata *calldata = data;
5417
5418 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5419 return;
5420 switch (task->tk_status) {
5421 case 0:
5422 renew_lease(calldata->server, calldata->timestamp);
5423 nfs4_update_lock_stateid(calldata->lsp,
5424 &calldata->res.stateid);
5425 break;
5426 case -NFS4ERR_BAD_STATEID:
5427 case -NFS4ERR_OLD_STATEID:
5428 case -NFS4ERR_STALE_STATEID:
5429 case -NFS4ERR_EXPIRED:
5430 if (!nfs4_stateid_match(&calldata->arg.stateid,
5431 &calldata->lsp->ls_stateid))
5432 rpc_restart_call_prepare(task);
5433 break;
5434 default:
5435 if (nfs4_async_handle_error(task, calldata->server,
5436 NULL, NULL) == -EAGAIN)
5437 rpc_restart_call_prepare(task);
5438 }
5439 nfs_release_seqid(calldata->arg.seqid);
5440}
5441
5442static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5443{
5444 struct nfs4_unlockdata *calldata = data;
5445
5446 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5447 goto out_wait;
5448 nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5449 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5450 /* Note: exit _without_ running nfs4_locku_done */
5451 goto out_no_action;
5452 }
5453 calldata->timestamp = jiffies;
5454 if (nfs4_setup_sequence(calldata->server,
5455 &calldata->arg.seq_args,
5456 &calldata->res.seq_res,
5457 task) != 0)
5458 nfs_release_seqid(calldata->arg.seqid);
5459 return;
5460out_no_action:
5461 task->tk_action = NULL;
5462out_wait:
5463 nfs4_sequence_done(task, &calldata->res.seq_res);
5464}
5465
5466static const struct rpc_call_ops nfs4_locku_ops = {
5467 .rpc_call_prepare = nfs4_locku_prepare,
5468 .rpc_call_done = nfs4_locku_done,
5469 .rpc_release = nfs4_locku_release_calldata,
5470};
5471
5472static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5473 struct nfs_open_context *ctx,
5474 struct nfs4_lock_state *lsp,
5475 struct nfs_seqid *seqid)
5476{
5477 struct nfs4_unlockdata *data;
5478 struct rpc_message msg = {
5479 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5480 .rpc_cred = ctx->cred,
5481 };
5482 struct rpc_task_setup task_setup_data = {
5483 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5484 .rpc_message = &msg,
5485 .callback_ops = &nfs4_locku_ops,
5486 .workqueue = nfsiod_workqueue,
5487 .flags = RPC_TASK_ASYNC,
5488 };
5489
5490 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5491 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5492
5493 /* Ensure this is an unlock - when canceling a lock, the
5494 * canceled lock is passed in, and it won't be an unlock.
5495 */
5496 fl->fl_type = F_UNLCK;
5497
5498 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5499 if (data == NULL) {
5500 nfs_free_seqid(seqid);
5501 return ERR_PTR(-ENOMEM);
5502 }
5503
5504 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5505 msg.rpc_argp = &data->arg;
5506 msg.rpc_resp = &data->res;
5507 task_setup_data.callback_data = data;
5508 return rpc_run_task(&task_setup_data);
5509}
5510
5511static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5512{
5513 struct inode *inode = state->inode;
5514 struct nfs4_state_owner *sp = state->owner;
5515 struct nfs_inode *nfsi = NFS_I(inode);
5516 struct nfs_seqid *seqid;
5517 struct nfs4_lock_state *lsp;
5518 struct rpc_task *task;
5519 int status = 0;
5520 unsigned char fl_flags = request->fl_flags;
5521
5522 status = nfs4_set_lock_state(state, request);
5523 /* Unlock _before_ we do the RPC call */
5524 request->fl_flags |= FL_EXISTS;
5525 /* Exclude nfs_delegation_claim_locks() */
5526 mutex_lock(&sp->so_delegreturn_mutex);
5527 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5528 down_read(&nfsi->rwsem);
5529 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5530 up_read(&nfsi->rwsem);
5531 mutex_unlock(&sp->so_delegreturn_mutex);
5532 goto out;
5533 }
5534 up_read(&nfsi->rwsem);
5535 mutex_unlock(&sp->so_delegreturn_mutex);
5536 if (status != 0)
5537 goto out;
5538 /* Is this a delegated lock? */
5539 lsp = request->fl_u.nfs4_fl.owner;
5540 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5541 goto out;
5542 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5543 status = -ENOMEM;
5544 if (IS_ERR(seqid))
5545 goto out;
5546 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5547 status = PTR_ERR(task);
5548 if (IS_ERR(task))
5549 goto out;
5550 status = nfs4_wait_for_completion_rpc_task(task);
5551 rpc_put_task(task);
5552out:
5553 request->fl_flags = fl_flags;
5554 trace_nfs4_unlock(request, state, F_SETLK, status);
5555 return status;
5556}
5557
5558struct nfs4_lockdata {
5559 struct nfs_lock_args arg;
5560 struct nfs_lock_res res;
5561 struct nfs4_lock_state *lsp;
5562 struct nfs_open_context *ctx;
5563 struct file_lock fl;
5564 unsigned long timestamp;
5565 int rpc_status;
5566 int cancelled;
5567 struct nfs_server *server;
5568};
5569
5570static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5571 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5572 gfp_t gfp_mask)
5573{
5574 struct nfs4_lockdata *p;
5575 struct inode *inode = lsp->ls_state->inode;
5576 struct nfs_server *server = NFS_SERVER(inode);
5577
5578 p = kzalloc(sizeof(*p), gfp_mask);
5579 if (p == NULL)
5580 return NULL;
5581
5582 p->arg.fh = NFS_FH(inode);
5583 p->arg.fl = &p->fl;
5584 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5585 if (IS_ERR(p->arg.open_seqid))
5586 goto out_free;
5587 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5588 if (IS_ERR(p->arg.lock_seqid))
5589 goto out_free_seqid;
5590 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5591 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5592 p->arg.lock_owner.s_dev = server->s_dev;
5593 p->res.lock_seqid = p->arg.lock_seqid;
5594 p->lsp = lsp;
5595 p->server = server;
5596 atomic_inc(&lsp->ls_count);
5597 p->ctx = get_nfs_open_context(ctx);
5598 memcpy(&p->fl, fl, sizeof(p->fl));
5599 return p;
5600out_free_seqid:
5601 nfs_free_seqid(p->arg.open_seqid);
5602out_free:
5603 kfree(p);
5604 return NULL;
5605}
5606
5607static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5608{
5609 struct nfs4_lockdata *data = calldata;
5610 struct nfs4_state *state = data->lsp->ls_state;
5611
5612 dprintk("%s: begin!\n", __func__);
5613 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5614 goto out_wait;
5615 /* Do we need to do an open_to_lock_owner? */
5616 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5617 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5618 goto out_release_lock_seqid;
5619 }
5620 nfs4_stateid_copy(&data->arg.open_stateid,
5621 &state->open_stateid);
5622 data->arg.new_lock_owner = 1;
5623 data->res.open_seqid = data->arg.open_seqid;
5624 } else {
5625 data->arg.new_lock_owner = 0;
5626 nfs4_stateid_copy(&data->arg.lock_stateid,
5627 &data->lsp->ls_stateid);
5628 }
5629 if (!nfs4_valid_open_stateid(state)) {
5630 data->rpc_status = -EBADF;
5631 task->tk_action = NULL;
5632 goto out_release_open_seqid;
5633 }
5634 data->timestamp = jiffies;
5635 if (nfs4_setup_sequence(data->server,
5636 &data->arg.seq_args,
5637 &data->res.seq_res,
5638 task) == 0)
5639 return;
5640out_release_open_seqid:
5641 nfs_release_seqid(data->arg.open_seqid);
5642out_release_lock_seqid:
5643 nfs_release_seqid(data->arg.lock_seqid);
5644out_wait:
5645 nfs4_sequence_done(task, &data->res.seq_res);
5646 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5647}
5648
5649static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5650{
5651 struct nfs4_lockdata *data = calldata;
5652 struct nfs4_lock_state *lsp = data->lsp;
5653
5654 dprintk("%s: begin!\n", __func__);
5655
5656 if (!nfs4_sequence_done(task, &data->res.seq_res))
5657 return;
5658
5659 data->rpc_status = task->tk_status;
5660 switch (task->tk_status) {
5661 case 0:
5662 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode),
5663 data->timestamp);
5664 if (data->arg.new_lock_owner != 0) {
5665 nfs_confirm_seqid(&lsp->ls_seqid, 0);
5666 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5667 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5668 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5669 rpc_restart_call_prepare(task);
5670 break;
5671 case -NFS4ERR_BAD_STATEID:
5672 case -NFS4ERR_OLD_STATEID:
5673 case -NFS4ERR_STALE_STATEID:
5674 case -NFS4ERR_EXPIRED:
5675 if (data->arg.new_lock_owner != 0) {
5676 if (!nfs4_stateid_match(&data->arg.open_stateid,
5677 &lsp->ls_state->open_stateid))
5678 rpc_restart_call_prepare(task);
5679 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5680 &lsp->ls_stateid))
5681 rpc_restart_call_prepare(task);
5682 }
5683 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5684}
5685
5686static void nfs4_lock_release(void *calldata)
5687{
5688 struct nfs4_lockdata *data = calldata;
5689
5690 dprintk("%s: begin!\n", __func__);
5691 nfs_free_seqid(data->arg.open_seqid);
5692 if (data->cancelled != 0) {
5693 struct rpc_task *task;
5694 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5695 data->arg.lock_seqid);
5696 if (!IS_ERR(task))
5697 rpc_put_task_async(task);
5698 dprintk("%s: cancelling lock!\n", __func__);
5699 } else
5700 nfs_free_seqid(data->arg.lock_seqid);
5701 nfs4_put_lock_state(data->lsp);
5702 put_nfs_open_context(data->ctx);
5703 kfree(data);
5704 dprintk("%s: done!\n", __func__);
5705}
5706
5707static const struct rpc_call_ops nfs4_lock_ops = {
5708 .rpc_call_prepare = nfs4_lock_prepare,
5709 .rpc_call_done = nfs4_lock_done,
5710 .rpc_release = nfs4_lock_release,
5711};
5712
5713static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5714{
5715 switch (error) {
5716 case -NFS4ERR_ADMIN_REVOKED:
5717 case -NFS4ERR_BAD_STATEID:
5718 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5719 if (new_lock_owner != 0 ||
5720 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5721 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5722 break;
5723 case -NFS4ERR_STALE_STATEID:
5724 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5725 case -NFS4ERR_EXPIRED:
5726 nfs4_schedule_lease_recovery(server->nfs_client);
5727 };
5728}
5729
5730static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5731{
5732 struct nfs4_lockdata *data;
5733 struct rpc_task *task;
5734 struct rpc_message msg = {
5735 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5736 .rpc_cred = state->owner->so_cred,
5737 };
5738 struct rpc_task_setup task_setup_data = {
5739 .rpc_client = NFS_CLIENT(state->inode),
5740 .rpc_message = &msg,
5741 .callback_ops = &nfs4_lock_ops,
5742 .workqueue = nfsiod_workqueue,
5743 .flags = RPC_TASK_ASYNC,
5744 };
5745 int ret;
5746
5747 dprintk("%s: begin!\n", __func__);
5748 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5749 fl->fl_u.nfs4_fl.owner,
5750 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5751 if (data == NULL)
5752 return -ENOMEM;
5753 if (IS_SETLKW(cmd))
5754 data->arg.block = 1;
5755 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5756 msg.rpc_argp = &data->arg;
5757 msg.rpc_resp = &data->res;
5758 task_setup_data.callback_data = data;
5759 if (recovery_type > NFS_LOCK_NEW) {
5760 if (recovery_type == NFS_LOCK_RECLAIM)
5761 data->arg.reclaim = NFS_LOCK_RECLAIM;
5762 nfs4_set_sequence_privileged(&data->arg.seq_args);
5763 }
5764 task = rpc_run_task(&task_setup_data);
5765 if (IS_ERR(task))
5766 return PTR_ERR(task);
5767 ret = nfs4_wait_for_completion_rpc_task(task);
5768 if (ret == 0) {
5769 ret = data->rpc_status;
5770 if (ret)
5771 nfs4_handle_setlk_error(data->server, data->lsp,
5772 data->arg.new_lock_owner, ret);
5773 } else
5774 data->cancelled = 1;
5775 rpc_put_task(task);
5776 dprintk("%s: done, ret = %d!\n", __func__, ret);
5777 return ret;
5778}
5779
5780static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5781{
5782 struct nfs_server *server = NFS_SERVER(state->inode);
5783 struct nfs4_exception exception = {
5784 .inode = state->inode,
5785 };
5786 int err;
5787
5788 do {
5789 /* Cache the lock if possible... */
5790 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5791 return 0;
5792 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5793 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5794 if (err != -NFS4ERR_DELAY)
5795 break;
5796 nfs4_handle_exception(server, err, &exception);
5797 } while (exception.retry);
5798 return err;
5799}
5800
5801static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5802{
5803 struct nfs_server *server = NFS_SERVER(state->inode);
5804 struct nfs4_exception exception = {
5805 .inode = state->inode,
5806 };
5807 int err;
5808
5809 err = nfs4_set_lock_state(state, request);
5810 if (err != 0)
5811 return err;
5812 if (!recover_lost_locks) {
5813 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5814 return 0;
5815 }
5816 do {
5817 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5818 return 0;
5819 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5820 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5821 switch (err) {
5822 default:
5823 goto out;
5824 case -NFS4ERR_GRACE:
5825 case -NFS4ERR_DELAY:
5826 nfs4_handle_exception(server, err, &exception);
5827 err = 0;
5828 }
5829 } while (exception.retry);
5830out:
5831 return err;
5832}
5833
5834#if defined(CONFIG_NFS_V4_1)
5835/**
5836 * nfs41_check_expired_locks - possibly free a lock stateid
5837 *
5838 * @state: NFSv4 state for an inode
5839 *
5840 * Returns NFS_OK if recovery for this stateid is now finished.
5841 * Otherwise a negative NFS4ERR value is returned.
5842 */
5843static int nfs41_check_expired_locks(struct nfs4_state *state)
5844{
5845 int status, ret = -NFS4ERR_BAD_STATEID;
5846 struct nfs4_lock_state *lsp;
5847 struct nfs_server *server = NFS_SERVER(state->inode);
5848
5849 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5850 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5851 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5852
5853 status = nfs41_test_stateid(server,
5854 &lsp->ls_stateid,
5855 cred);
5856 trace_nfs4_test_lock_stateid(state, lsp, status);
5857 if (status != NFS_OK) {
5858 /* Free the stateid unless the server
5859 * informs us the stateid is unrecognized. */
5860 if (status != -NFS4ERR_BAD_STATEID)
5861 nfs41_free_stateid(server,
5862 &lsp->ls_stateid,
5863 cred);
5864 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5865 ret = status;
5866 }
5867 }
5868 };
5869
5870 return ret;
5871}
5872
5873static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5874{
5875 int status = NFS_OK;
5876
5877 if (test_bit(LK_STATE_IN_USE, &state->flags))
5878 status = nfs41_check_expired_locks(state);
5879 if (status != NFS_OK)
5880 status = nfs4_lock_expired(state, request);
5881 return status;
5882}
5883#endif
5884
5885static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5886{
5887 struct nfs4_state_owner *sp = state->owner;
5888 struct nfs_inode *nfsi = NFS_I(state->inode);
5889 unsigned char fl_flags = request->fl_flags;
5890 unsigned int seq;
5891 int status = -ENOLCK;
5892
5893 if ((fl_flags & FL_POSIX) &&
5894 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5895 goto out;
5896 /* Is this a delegated open? */
5897 status = nfs4_set_lock_state(state, request);
5898 if (status != 0)
5899 goto out;
5900 request->fl_flags |= FL_ACCESS;
5901 status = do_vfs_lock(request->fl_file, request);
5902 if (status < 0)
5903 goto out;
5904 down_read(&nfsi->rwsem);
5905 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5906 /* Yes: cache locks! */
5907 /* ...but avoid races with delegation recall... */
5908 request->fl_flags = fl_flags & ~FL_SLEEP;
5909 status = do_vfs_lock(request->fl_file, request);
5910 goto out_unlock;
5911 }
5912 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5913 up_read(&nfsi->rwsem);
5914 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5915 if (status != 0)
5916 goto out;
5917 down_read(&nfsi->rwsem);
5918 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5919 status = -NFS4ERR_DELAY;
5920 goto out_unlock;
5921 }
5922 /* Note: we always want to sleep here! */
5923 request->fl_flags = fl_flags | FL_SLEEP;
5924 if (do_vfs_lock(request->fl_file, request) < 0)
5925 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5926 "manager!\n", __func__);
5927out_unlock:
5928 up_read(&nfsi->rwsem);
5929out:
5930 request->fl_flags = fl_flags;
5931 return status;
5932}
5933
5934static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5935{
5936 struct nfs4_exception exception = {
5937 .state = state,
5938 .inode = state->inode,
5939 };
5940 int err;
5941
5942 do {
5943 err = _nfs4_proc_setlk(state, cmd, request);
5944 trace_nfs4_set_lock(request, state, cmd, err);
5945 if (err == -NFS4ERR_DENIED)
5946 err = -EAGAIN;
5947 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5948 err, &exception);
5949 } while (exception.retry);
5950 return err;
5951}
5952
5953static int
5954nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5955{
5956 struct nfs_open_context *ctx;
5957 struct nfs4_state *state;
5958 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5959 int status;
5960
5961 /* verify open state */
5962 ctx = nfs_file_open_context(filp);
5963 state = ctx->state;
5964
5965 if (request->fl_start < 0 || request->fl_end < 0)
5966 return -EINVAL;
5967
5968 if (IS_GETLK(cmd)) {
5969 if (state != NULL)
5970 return nfs4_proc_getlk(state, F_GETLK, request);
5971 return 0;
5972 }
5973
5974 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5975 return -EINVAL;
5976
5977 if (request->fl_type == F_UNLCK) {
5978 if (state != NULL)
5979 return nfs4_proc_unlck(state, cmd, request);
5980 return 0;
5981 }
5982
5983 if (state == NULL)
5984 return -ENOLCK;
5985 /*
5986 * Don't rely on the VFS having checked the file open mode,
5987 * since it won't do this for flock() locks.
5988 */
5989 switch (request->fl_type) {
5990 case F_RDLCK:
5991 if (!(filp->f_mode & FMODE_READ))
5992 return -EBADF;
5993 break;
5994 case F_WRLCK:
5995 if (!(filp->f_mode & FMODE_WRITE))
5996 return -EBADF;
5997 }
5998
5999 do {
6000 status = nfs4_proc_setlk(state, cmd, request);
6001 if ((status != -EAGAIN) || IS_SETLK(cmd))
6002 break;
6003 timeout = nfs4_set_lock_task_retry(timeout);
6004 status = -ERESTARTSYS;
6005 if (signalled())
6006 break;
6007 } while(status < 0);
6008 return status;
6009}
6010
6011int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6012{
6013 struct nfs_server *server = NFS_SERVER(state->inode);
6014 int err;
6015
6016 err = nfs4_set_lock_state(state, fl);
6017 if (err != 0)
6018 return err;
6019 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6020 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6021}
6022
6023struct nfs_release_lockowner_data {
6024 struct nfs4_lock_state *lsp;
6025 struct nfs_server *server;
6026 struct nfs_release_lockowner_args args;
6027 struct nfs_release_lockowner_res res;
6028 unsigned long timestamp;
6029};
6030
6031static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6032{
6033 struct nfs_release_lockowner_data *data = calldata;
6034 struct nfs_server *server = data->server;
6035 nfs40_setup_sequence(server, &data->args.seq_args,
6036 &data->res.seq_res, task);
6037 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6038 data->timestamp = jiffies;
6039}
6040
6041static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6042{
6043 struct nfs_release_lockowner_data *data = calldata;
6044 struct nfs_server *server = data->server;
6045
6046 nfs40_sequence_done(task, &data->res.seq_res);
6047
6048 switch (task->tk_status) {
6049 case 0:
6050 renew_lease(server, data->timestamp);
6051 break;
6052 case -NFS4ERR_STALE_CLIENTID:
6053 case -NFS4ERR_EXPIRED:
6054 nfs4_schedule_lease_recovery(server->nfs_client);
6055 break;
6056 case -NFS4ERR_LEASE_MOVED:
6057 case -NFS4ERR_DELAY:
6058 if (nfs4_async_handle_error(task, server,
6059 NULL, NULL) == -EAGAIN)
6060 rpc_restart_call_prepare(task);
6061 }
6062}
6063
6064static void nfs4_release_lockowner_release(void *calldata)
6065{
6066 struct nfs_release_lockowner_data *data = calldata;
6067 nfs4_free_lock_state(data->server, data->lsp);
6068 kfree(calldata);
6069}
6070
6071static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6072 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6073 .rpc_call_done = nfs4_release_lockowner_done,
6074 .rpc_release = nfs4_release_lockowner_release,
6075};
6076
6077static void
6078nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6079{
6080 struct nfs_release_lockowner_data *data;
6081 struct rpc_message msg = {
6082 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6083 };
6084
6085 if (server->nfs_client->cl_mvops->minor_version != 0)
6086 return;
6087
6088 data = kmalloc(sizeof(*data), GFP_NOFS);
6089 if (!data)
6090 return;
6091 data->lsp = lsp;
6092 data->server = server;
6093 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6094 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6095 data->args.lock_owner.s_dev = server->s_dev;
6096
6097 msg.rpc_argp = &data->args;
6098 msg.rpc_resp = &data->res;
6099 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6100 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6101}
6102
6103#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6104
6105static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6106 const void *buf, size_t buflen,
6107 int flags, int type)
6108{
6109 if (strcmp(key, "") != 0)
6110 return -EINVAL;
6111
6112 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6113}
6114
6115static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6116 void *buf, size_t buflen, int type)
6117{
6118 if (strcmp(key, "") != 0)
6119 return -EINVAL;
6120
6121 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6122}
6123
6124static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6125 size_t list_len, const char *name,
6126 size_t name_len, int type)
6127{
6128 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6129
6130 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6131 return 0;
6132
6133 if (list && len <= list_len)
6134 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6135 return len;
6136}
6137
6138#ifdef CONFIG_NFS_V4_SECURITY_LABEL
6139static inline int nfs4_server_supports_labels(struct nfs_server *server)
6140{
6141 return server->caps & NFS_CAP_SECURITY_LABEL;
6142}
6143
6144static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6145 const void *buf, size_t buflen,
6146 int flags, int type)
6147{
6148 if (security_ismaclabel(key))
6149 return nfs4_set_security_label(dentry, buf, buflen);
6150
6151 return -EOPNOTSUPP;
6152}
6153
6154static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6155 void *buf, size_t buflen, int type)
6156{
6157 if (security_ismaclabel(key))
6158 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6159 return -EOPNOTSUPP;
6160}
6161
6162static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6163 size_t list_len, const char *name,
6164 size_t name_len, int type)
6165{
6166 size_t len = 0;
6167
6168 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6169 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6170 if (list && len <= list_len)
6171 security_inode_listsecurity(dentry->d_inode, list, len);
6172 }
6173 return len;
6174}
6175
6176static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6177 .prefix = XATTR_SECURITY_PREFIX,
6178 .list = nfs4_xattr_list_nfs4_label,
6179 .get = nfs4_xattr_get_nfs4_label,
6180 .set = nfs4_xattr_set_nfs4_label,
6181};
6182#endif
6183
6184
6185/*
6186 * nfs_fhget will use either the mounted_on_fileid or the fileid
6187 */
6188static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6189{
6190 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6191 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6192 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6193 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6194 return;
6195
6196 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6197 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6198 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6199 fattr->nlink = 2;
6200}
6201
6202static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6203 const struct qstr *name,
6204 struct nfs4_fs_locations *fs_locations,
6205 struct page *page)
6206{
6207 struct nfs_server *server = NFS_SERVER(dir);
6208 u32 bitmask[3] = {
6209 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6210 };
6211 struct nfs4_fs_locations_arg args = {
6212 .dir_fh = NFS_FH(dir),
6213 .name = name,
6214 .page = page,
6215 .bitmask = bitmask,
6216 };
6217 struct nfs4_fs_locations_res res = {
6218 .fs_locations = fs_locations,
6219 };
6220 struct rpc_message msg = {
6221 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6222 .rpc_argp = &args,
6223 .rpc_resp = &res,
6224 };
6225 int status;
6226
6227 dprintk("%s: start\n", __func__);
6228
6229 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6230 * is not supported */
6231 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6232 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6233 else
6234 bitmask[0] |= FATTR4_WORD0_FILEID;
6235
6236 nfs_fattr_init(&fs_locations->fattr);
6237 fs_locations->server = server;
6238 fs_locations->nlocations = 0;
6239 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6240 dprintk("%s: returned status = %d\n", __func__, status);
6241 return status;
6242}
6243
6244int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6245 const struct qstr *name,
6246 struct nfs4_fs_locations *fs_locations,
6247 struct page *page)
6248{
6249 struct nfs4_exception exception = { };
6250 int err;
6251 do {
6252 err = _nfs4_proc_fs_locations(client, dir, name,
6253 fs_locations, page);
6254 trace_nfs4_get_fs_locations(dir, name, err);
6255 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6256 &exception);
6257 } while (exception.retry);
6258 return err;
6259}
6260
6261/*
6262 * This operation also signals the server that this client is
6263 * performing migration recovery. The server can stop returning
6264 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6265 * appended to this compound to identify the client ID which is
6266 * performing recovery.
6267 */
6268static int _nfs40_proc_get_locations(struct inode *inode,
6269 struct nfs4_fs_locations *locations,
6270 struct page *page, struct rpc_cred *cred)
6271{
6272 struct nfs_server *server = NFS_SERVER(inode);
6273 struct rpc_clnt *clnt = server->client;
6274 u32 bitmask[2] = {
6275 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6276 };
6277 struct nfs4_fs_locations_arg args = {
6278 .clientid = server->nfs_client->cl_clientid,
6279 .fh = NFS_FH(inode),
6280 .page = page,
6281 .bitmask = bitmask,
6282 .migration = 1, /* skip LOOKUP */
6283 .renew = 1, /* append RENEW */
6284 };
6285 struct nfs4_fs_locations_res res = {
6286 .fs_locations = locations,
6287 .migration = 1,
6288 .renew = 1,
6289 };
6290 struct rpc_message msg = {
6291 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6292 .rpc_argp = &args,
6293 .rpc_resp = &res,
6294 .rpc_cred = cred,
6295 };
6296 unsigned long now = jiffies;
6297 int status;
6298
6299 nfs_fattr_init(&locations->fattr);
6300 locations->server = server;
6301 locations->nlocations = 0;
6302
6303 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6304 nfs4_set_sequence_privileged(&args.seq_args);
6305 status = nfs4_call_sync_sequence(clnt, server, &msg,
6306 &args.seq_args, &res.seq_res);
6307 if (status)
6308 return status;
6309
6310 renew_lease(server, now);
6311 return 0;
6312}
6313
6314#ifdef CONFIG_NFS_V4_1
6315
6316/*
6317 * This operation also signals the server that this client is
6318 * performing migration recovery. The server can stop asserting
6319 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6320 * performing this operation is identified in the SEQUENCE
6321 * operation in this compound.
6322 *
6323 * When the client supports GETATTR(fs_locations_info), it can
6324 * be plumbed in here.
6325 */
6326static int _nfs41_proc_get_locations(struct inode *inode,
6327 struct nfs4_fs_locations *locations,
6328 struct page *page, struct rpc_cred *cred)
6329{
6330 struct nfs_server *server = NFS_SERVER(inode);
6331 struct rpc_clnt *clnt = server->client;
6332 u32 bitmask[2] = {
6333 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6334 };
6335 struct nfs4_fs_locations_arg args = {
6336 .fh = NFS_FH(inode),
6337 .page = page,
6338 .bitmask = bitmask,
6339 .migration = 1, /* skip LOOKUP */
6340 };
6341 struct nfs4_fs_locations_res res = {
6342 .fs_locations = locations,
6343 .migration = 1,
6344 };
6345 struct rpc_message msg = {
6346 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6347 .rpc_argp = &args,
6348 .rpc_resp = &res,
6349 .rpc_cred = cred,
6350 };
6351 int status;
6352
6353 nfs_fattr_init(&locations->fattr);
6354 locations->server = server;
6355 locations->nlocations = 0;
6356
6357 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6358 nfs4_set_sequence_privileged(&args.seq_args);
6359 status = nfs4_call_sync_sequence(clnt, server, &msg,
6360 &args.seq_args, &res.seq_res);
6361 if (status == NFS4_OK &&
6362 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6363 status = -NFS4ERR_LEASE_MOVED;
6364 return status;
6365}
6366
6367#endif /* CONFIG_NFS_V4_1 */
6368
6369/**
6370 * nfs4_proc_get_locations - discover locations for a migrated FSID
6371 * @inode: inode on FSID that is migrating
6372 * @locations: result of query
6373 * @page: buffer
6374 * @cred: credential to use for this operation
6375 *
6376 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6377 * operation failed, or a negative errno if a local error occurred.
6378 *
6379 * On success, "locations" is filled in, but if the server has
6380 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6381 * asserted.
6382 *
6383 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6384 * from this client that require migration recovery.
6385 */
6386int nfs4_proc_get_locations(struct inode *inode,
6387 struct nfs4_fs_locations *locations,
6388 struct page *page, struct rpc_cred *cred)
6389{
6390 struct nfs_server *server = NFS_SERVER(inode);
6391 struct nfs_client *clp = server->nfs_client;
6392 const struct nfs4_mig_recovery_ops *ops =
6393 clp->cl_mvops->mig_recovery_ops;
6394 struct nfs4_exception exception = { };
6395 int status;
6396
6397 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6398 (unsigned long long)server->fsid.major,
6399 (unsigned long long)server->fsid.minor,
6400 clp->cl_hostname);
6401 nfs_display_fhandle(NFS_FH(inode), __func__);
6402
6403 do {
6404 status = ops->get_locations(inode, locations, page, cred);
6405 if (status != -NFS4ERR_DELAY)
6406 break;
6407 nfs4_handle_exception(server, status, &exception);
6408 } while (exception.retry);
6409 return status;
6410}
6411
6412/*
6413 * This operation also signals the server that this client is
6414 * performing "lease moved" recovery. The server can stop
6415 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6416 * is appended to this compound to identify the client ID which is
6417 * performing recovery.
6418 */
6419static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6420{
6421 struct nfs_server *server = NFS_SERVER(inode);
6422 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6423 struct rpc_clnt *clnt = server->client;
6424 struct nfs4_fsid_present_arg args = {
6425 .fh = NFS_FH(inode),
6426 .clientid = clp->cl_clientid,
6427 .renew = 1, /* append RENEW */
6428 };
6429 struct nfs4_fsid_present_res res = {
6430 .renew = 1,
6431 };
6432 struct rpc_message msg = {
6433 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6434 .rpc_argp = &args,
6435 .rpc_resp = &res,
6436 .rpc_cred = cred,
6437 };
6438 unsigned long now = jiffies;
6439 int status;
6440
6441 res.fh = nfs_alloc_fhandle();
6442 if (res.fh == NULL)
6443 return -ENOMEM;
6444
6445 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6446 nfs4_set_sequence_privileged(&args.seq_args);
6447 status = nfs4_call_sync_sequence(clnt, server, &msg,
6448 &args.seq_args, &res.seq_res);
6449 nfs_free_fhandle(res.fh);
6450 if (status)
6451 return status;
6452
6453 do_renew_lease(clp, now);
6454 return 0;
6455}
6456
6457#ifdef CONFIG_NFS_V4_1
6458
6459/*
6460 * This operation also signals the server that this client is
6461 * performing "lease moved" recovery. The server can stop asserting
6462 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6463 * this operation is identified in the SEQUENCE operation in this
6464 * compound.
6465 */
6466static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6467{
6468 struct nfs_server *server = NFS_SERVER(inode);
6469 struct rpc_clnt *clnt = server->client;
6470 struct nfs4_fsid_present_arg args = {
6471 .fh = NFS_FH(inode),
6472 };
6473 struct nfs4_fsid_present_res res = {
6474 };
6475 struct rpc_message msg = {
6476 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6477 .rpc_argp = &args,
6478 .rpc_resp = &res,
6479 .rpc_cred = cred,
6480 };
6481 int status;
6482
6483 res.fh = nfs_alloc_fhandle();
6484 if (res.fh == NULL)
6485 return -ENOMEM;
6486
6487 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6488 nfs4_set_sequence_privileged(&args.seq_args);
6489 status = nfs4_call_sync_sequence(clnt, server, &msg,
6490 &args.seq_args, &res.seq_res);
6491 nfs_free_fhandle(res.fh);
6492 if (status == NFS4_OK &&
6493 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6494 status = -NFS4ERR_LEASE_MOVED;
6495 return status;
6496}
6497
6498#endif /* CONFIG_NFS_V4_1 */
6499
6500/**
6501 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6502 * @inode: inode on FSID to check
6503 * @cred: credential to use for this operation
6504 *
6505 * Server indicates whether the FSID is present, moved, or not
6506 * recognized. This operation is necessary to clear a LEASE_MOVED
6507 * condition for this client ID.
6508 *
6509 * Returns NFS4_OK if the FSID is present on this server,
6510 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6511 * NFS4ERR code if some error occurred on the server, or a
6512 * negative errno if a local failure occurred.
6513 */
6514int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6515{
6516 struct nfs_server *server = NFS_SERVER(inode);
6517 struct nfs_client *clp = server->nfs_client;
6518 const struct nfs4_mig_recovery_ops *ops =
6519 clp->cl_mvops->mig_recovery_ops;
6520 struct nfs4_exception exception = { };
6521 int status;
6522
6523 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6524 (unsigned long long)server->fsid.major,
6525 (unsigned long long)server->fsid.minor,
6526 clp->cl_hostname);
6527 nfs_display_fhandle(NFS_FH(inode), __func__);
6528
6529 do {
6530 status = ops->fsid_present(inode, cred);
6531 if (status != -NFS4ERR_DELAY)
6532 break;
6533 nfs4_handle_exception(server, status, &exception);
6534 } while (exception.retry);
6535 return status;
6536}
6537
6538/**
6539 * If 'use_integrity' is true and the state managment nfs_client
6540 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6541 * and the machine credential as per RFC3530bis and RFC5661 Security
6542 * Considerations sections. Otherwise, just use the user cred with the
6543 * filesystem's rpc_client.
6544 */
6545static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6546{
6547 int status;
6548 struct nfs4_secinfo_arg args = {
6549 .dir_fh = NFS_FH(dir),
6550 .name = name,
6551 };
6552 struct nfs4_secinfo_res res = {
6553 .flavors = flavors,
6554 };
6555 struct rpc_message msg = {
6556 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6557 .rpc_argp = &args,
6558 .rpc_resp = &res,
6559 };
6560 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6561 struct rpc_cred *cred = NULL;
6562
6563 if (use_integrity) {
6564 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6565 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6566 msg.rpc_cred = cred;
6567 }
6568
6569 dprintk("NFS call secinfo %s\n", name->name);
6570
6571 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6572 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6573
6574 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6575 &res.seq_res, 0);
6576 dprintk("NFS reply secinfo: %d\n", status);
6577
6578 if (cred)
6579 put_rpccred(cred);
6580
6581 return status;
6582}
6583
6584int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6585 struct nfs4_secinfo_flavors *flavors)
6586{
6587 struct nfs4_exception exception = { };
6588 int err;
6589 do {
6590 err = -NFS4ERR_WRONGSEC;
6591
6592 /* try to use integrity protection with machine cred */
6593 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6594 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6595
6596 /*
6597 * if unable to use integrity protection, or SECINFO with
6598 * integrity protection returns NFS4ERR_WRONGSEC (which is
6599 * disallowed by spec, but exists in deployed servers) use
6600 * the current filesystem's rpc_client and the user cred.
6601 */
6602 if (err == -NFS4ERR_WRONGSEC)
6603 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6604
6605 trace_nfs4_secinfo(dir, name, err);
6606 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6607 &exception);
6608 } while (exception.retry);
6609 return err;
6610}
6611
6612#ifdef CONFIG_NFS_V4_1
6613/*
6614 * Check the exchange flags returned by the server for invalid flags, having
6615 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6616 * DS flags set.
6617 */
6618static int nfs4_check_cl_exchange_flags(u32 flags)
6619{
6620 if (flags & ~EXCHGID4_FLAG_MASK_R)
6621 goto out_inval;
6622 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6623 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6624 goto out_inval;
6625 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6626 goto out_inval;
6627 return NFS_OK;
6628out_inval:
6629 return -NFS4ERR_INVAL;
6630}
6631
6632static bool
6633nfs41_same_server_scope(struct nfs41_server_scope *a,
6634 struct nfs41_server_scope *b)
6635{
6636 if (a->server_scope_sz == b->server_scope_sz &&
6637 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6638 return true;
6639
6640 return false;
6641}
6642
6643/*
6644 * nfs4_proc_bind_conn_to_session()
6645 *
6646 * The 4.1 client currently uses the same TCP connection for the
6647 * fore and backchannel.
6648 */
6649int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6650{
6651 int status;
6652 struct nfs41_bind_conn_to_session_res res;
6653 struct rpc_message msg = {
6654 .rpc_proc =
6655 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6656 .rpc_argp = clp,
6657 .rpc_resp = &res,
6658 .rpc_cred = cred,
6659 };
6660
6661 dprintk("--> %s\n", __func__);
6662
6663 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6664 if (unlikely(res.session == NULL)) {
6665 status = -ENOMEM;
6666 goto out;
6667 }
6668
6669 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6670 trace_nfs4_bind_conn_to_session(clp, status);
6671 if (status == 0) {
6672 if (memcmp(res.session->sess_id.data,
6673 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6674 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6675 status = -EIO;
6676 goto out_session;
6677 }
6678 if (res.dir != NFS4_CDFS4_BOTH) {
6679 dprintk("NFS: %s: Unexpected direction from server\n",
6680 __func__);
6681 status = -EIO;
6682 goto out_session;
6683 }
6684 if (res.use_conn_in_rdma_mode) {
6685 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6686 __func__);
6687 status = -EIO;
6688 goto out_session;
6689 }
6690 }
6691out_session:
6692 kfree(res.session);
6693out:
6694 dprintk("<-- %s status= %d\n", __func__, status);
6695 return status;
6696}
6697
6698/*
6699 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6700 * and operations we'd like to see to enable certain features in the allow map
6701 */
6702static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6703 .how = SP4_MACH_CRED,
6704 .enforce.u.words = {
6705 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6706 1 << (OP_EXCHANGE_ID - 32) |
6707 1 << (OP_CREATE_SESSION - 32) |
6708 1 << (OP_DESTROY_SESSION - 32) |
6709 1 << (OP_DESTROY_CLIENTID - 32)
6710 },
6711 .allow.u.words = {
6712 [0] = 1 << (OP_CLOSE) |
6713 1 << (OP_LOCKU) |
6714 1 << (OP_COMMIT),
6715 [1] = 1 << (OP_SECINFO - 32) |
6716 1 << (OP_SECINFO_NO_NAME - 32) |
6717 1 << (OP_TEST_STATEID - 32) |
6718 1 << (OP_FREE_STATEID - 32) |
6719 1 << (OP_WRITE - 32)
6720 }
6721};
6722
6723/*
6724 * Select the state protection mode for client `clp' given the server results
6725 * from exchange_id in `sp'.
6726 *
6727 * Returns 0 on success, negative errno otherwise.
6728 */
6729static int nfs4_sp4_select_mode(struct nfs_client *clp,
6730 struct nfs41_state_protection *sp)
6731{
6732 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6733 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6734 1 << (OP_EXCHANGE_ID - 32) |
6735 1 << (OP_CREATE_SESSION - 32) |
6736 1 << (OP_DESTROY_SESSION - 32) |
6737 1 << (OP_DESTROY_CLIENTID - 32)
6738 };
6739 unsigned int i;
6740
6741 if (sp->how == SP4_MACH_CRED) {
6742 /* Print state protect result */
6743 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6744 for (i = 0; i <= LAST_NFS4_OP; i++) {
6745 if (test_bit(i, sp->enforce.u.longs))
6746 dfprintk(MOUNT, " enforce op %d\n", i);
6747 if (test_bit(i, sp->allow.u.longs))
6748 dfprintk(MOUNT, " allow op %d\n", i);
6749 }
6750
6751 /* make sure nothing is on enforce list that isn't supported */
6752 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6753 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6754 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6755 return -EINVAL;
6756 }
6757 }
6758
6759 /*
6760 * Minimal mode - state operations are allowed to use machine
6761 * credential. Note this already happens by default, so the
6762 * client doesn't have to do anything more than the negotiation.
6763 *
6764 * NOTE: we don't care if EXCHANGE_ID is in the list -
6765 * we're already using the machine cred for exchange_id
6766 * and will never use a different cred.
6767 */
6768 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6769 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6770 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6771 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6772 dfprintk(MOUNT, "sp4_mach_cred:\n");
6773 dfprintk(MOUNT, " minimal mode enabled\n");
6774 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6775 } else {
6776 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6777 return -EINVAL;
6778 }
6779
6780 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6781 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6782 dfprintk(MOUNT, " cleanup mode enabled\n");
6783 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6784 }
6785
6786 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6787 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6788 dfprintk(MOUNT, " secinfo mode enabled\n");
6789 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6790 }
6791
6792 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6793 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6794 dfprintk(MOUNT, " stateid mode enabled\n");
6795 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6796 }
6797
6798 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6799 dfprintk(MOUNT, " write mode enabled\n");
6800 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6801 }
6802
6803 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6804 dfprintk(MOUNT, " commit mode enabled\n");
6805 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6806 }
6807 }
6808
6809 return 0;
6810}
6811
6812/*
6813 * _nfs4_proc_exchange_id()
6814 *
6815 * Wrapper for EXCHANGE_ID operation.
6816 */
6817static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6818 u32 sp4_how)
6819{
6820 nfs4_verifier verifier;
6821 struct nfs41_exchange_id_args args = {
6822 .verifier = &verifier,
6823 .client = clp,
6824#ifdef CONFIG_NFS_V4_1_MIGRATION
6825 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6826 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6827 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6828#else
6829 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6830 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6831#endif
6832 };
6833 struct nfs41_exchange_id_res res = {
6834 0
6835 };
6836 int status;
6837 struct rpc_message msg = {
6838 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6839 .rpc_argp = &args,
6840 .rpc_resp = &res,
6841 .rpc_cred = cred,
6842 };
6843
6844 nfs4_init_boot_verifier(clp, &verifier);
6845 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6846 sizeof(args.id));
6847 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6848 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6849 args.id_len, args.id);
6850
6851 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6852 GFP_NOFS);
6853 if (unlikely(res.server_owner == NULL)) {
6854 status = -ENOMEM;
6855 goto out;
6856 }
6857
6858 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6859 GFP_NOFS);
6860 if (unlikely(res.server_scope == NULL)) {
6861 status = -ENOMEM;
6862 goto out_server_owner;
6863 }
6864
6865 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6866 if (unlikely(res.impl_id == NULL)) {
6867 status = -ENOMEM;
6868 goto out_server_scope;
6869 }
6870
6871 switch (sp4_how) {
6872 case SP4_NONE:
6873 args.state_protect.how = SP4_NONE;
6874 break;
6875
6876 case SP4_MACH_CRED:
6877 args.state_protect = nfs4_sp4_mach_cred_request;
6878 break;
6879
6880 default:
6881 /* unsupported! */
6882 WARN_ON_ONCE(1);
6883 status = -EINVAL;
6884 goto out_server_scope;
6885 }
6886
6887 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6888 trace_nfs4_exchange_id(clp, status);
6889 if (status == 0)
6890 status = nfs4_check_cl_exchange_flags(res.flags);
6891
6892 if (status == 0)
6893 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6894
6895 if (status == 0) {
6896 clp->cl_clientid = res.clientid;
6897 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6898 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6899 clp->cl_seqid = res.seqid;
6900
6901 kfree(clp->cl_serverowner);
6902 clp->cl_serverowner = res.server_owner;
6903 res.server_owner = NULL;
6904
6905 /* use the most recent implementation id */
6906 kfree(clp->cl_implid);
6907 clp->cl_implid = res.impl_id;
6908
6909 if (clp->cl_serverscope != NULL &&
6910 !nfs41_same_server_scope(clp->cl_serverscope,
6911 res.server_scope)) {
6912 dprintk("%s: server_scope mismatch detected\n",
6913 __func__);
6914 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6915 kfree(clp->cl_serverscope);
6916 clp->cl_serverscope = NULL;
6917 }
6918
6919 if (clp->cl_serverscope == NULL) {
6920 clp->cl_serverscope = res.server_scope;
6921 goto out;
6922 }
6923 } else
6924 kfree(res.impl_id);
6925
6926out_server_owner:
6927 kfree(res.server_owner);
6928out_server_scope:
6929 kfree(res.server_scope);
6930out:
6931 if (clp->cl_implid != NULL)
6932 dprintk("NFS reply exchange_id: Server Implementation ID: "
6933 "domain: %s, name: %s, date: %llu,%u\n",
6934 clp->cl_implid->domain, clp->cl_implid->name,
6935 clp->cl_implid->date.seconds,
6936 clp->cl_implid->date.nseconds);
6937 dprintk("NFS reply exchange_id: %d\n", status);
6938 return status;
6939}
6940
6941/*
6942 * nfs4_proc_exchange_id()
6943 *
6944 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6945 *
6946 * Since the clientid has expired, all compounds using sessions
6947 * associated with the stale clientid will be returning
6948 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6949 * be in some phase of session reset.
6950 *
6951 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6952 */
6953int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6954{
6955 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6956 int status;
6957
6958 /* try SP4_MACH_CRED if krb5i/p */
6959 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6960 authflavor == RPC_AUTH_GSS_KRB5P) {
6961 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6962 if (!status)
6963 return 0;
6964 }
6965
6966 /* try SP4_NONE */
6967 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6968}
6969
6970static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6971 struct rpc_cred *cred)
6972{
6973 struct rpc_message msg = {
6974 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6975 .rpc_argp = clp,
6976 .rpc_cred = cred,
6977 };
6978 int status;
6979
6980 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6981 trace_nfs4_destroy_clientid(clp, status);
6982 if (status)
6983 dprintk("NFS: Got error %d from the server %s on "
6984 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6985 return status;
6986}
6987
6988static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6989 struct rpc_cred *cred)
6990{
6991 unsigned int loop;
6992 int ret;
6993
6994 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6995 ret = _nfs4_proc_destroy_clientid(clp, cred);
6996 switch (ret) {
6997 case -NFS4ERR_DELAY:
6998 case -NFS4ERR_CLIENTID_BUSY:
6999 ssleep(1);
7000 break;
7001 default:
7002 return ret;
7003 }
7004 }
7005 return 0;
7006}
7007
7008int nfs4_destroy_clientid(struct nfs_client *clp)
7009{
7010 struct rpc_cred *cred;
7011 int ret = 0;
7012
7013 if (clp->cl_mvops->minor_version < 1)
7014 goto out;
7015 if (clp->cl_exchange_flags == 0)
7016 goto out;
7017 if (clp->cl_preserve_clid)
7018 goto out;
7019 cred = nfs4_get_clid_cred(clp);
7020 ret = nfs4_proc_destroy_clientid(clp, cred);
7021 if (cred)
7022 put_rpccred(cred);
7023 switch (ret) {
7024 case 0:
7025 case -NFS4ERR_STALE_CLIENTID:
7026 clp->cl_exchange_flags = 0;
7027 }
7028out:
7029 return ret;
7030}
7031
7032struct nfs4_get_lease_time_data {
7033 struct nfs4_get_lease_time_args *args;
7034 struct nfs4_get_lease_time_res *res;
7035 struct nfs_client *clp;
7036};
7037
7038static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7039 void *calldata)
7040{
7041 struct nfs4_get_lease_time_data *data =
7042 (struct nfs4_get_lease_time_data *)calldata;
7043
7044 dprintk("--> %s\n", __func__);
7045 /* just setup sequence, do not trigger session recovery
7046 since we're invoked within one */
7047 nfs41_setup_sequence(data->clp->cl_session,
7048 &data->args->la_seq_args,
7049 &data->res->lr_seq_res,
7050 task);
7051 dprintk("<-- %s\n", __func__);
7052}
7053
7054/*
7055 * Called from nfs4_state_manager thread for session setup, so don't recover
7056 * from sequence operation or clientid errors.
7057 */
7058static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7059{
7060 struct nfs4_get_lease_time_data *data =
7061 (struct nfs4_get_lease_time_data *)calldata;
7062
7063 dprintk("--> %s\n", __func__);
7064 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7065 return;
7066 switch (task->tk_status) {
7067 case -NFS4ERR_DELAY:
7068 case -NFS4ERR_GRACE:
7069 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7070 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7071 task->tk_status = 0;
7072 /* fall through */
7073 case -NFS4ERR_RETRY_UNCACHED_REP:
7074 rpc_restart_call_prepare(task);
7075 return;
7076 }
7077 dprintk("<-- %s\n", __func__);
7078}
7079
7080static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7081 .rpc_call_prepare = nfs4_get_lease_time_prepare,
7082 .rpc_call_done = nfs4_get_lease_time_done,
7083};
7084
7085int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7086{
7087 struct rpc_task *task;
7088 struct nfs4_get_lease_time_args args;
7089 struct nfs4_get_lease_time_res res = {
7090 .lr_fsinfo = fsinfo,
7091 };
7092 struct nfs4_get_lease_time_data data = {
7093 .args = &args,
7094 .res = &res,
7095 .clp = clp,
7096 };
7097 struct rpc_message msg = {
7098 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7099 .rpc_argp = &args,
7100 .rpc_resp = &res,
7101 };
7102 struct rpc_task_setup task_setup = {
7103 .rpc_client = clp->cl_rpcclient,
7104 .rpc_message = &msg,
7105 .callback_ops = &nfs4_get_lease_time_ops,
7106 .callback_data = &data,
7107 .flags = RPC_TASK_TIMEOUT,
7108 };
7109 int status;
7110
7111 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7112 nfs4_set_sequence_privileged(&args.la_seq_args);
7113 dprintk("--> %s\n", __func__);
7114 task = rpc_run_task(&task_setup);
7115
7116 if (IS_ERR(task))
7117 status = PTR_ERR(task);
7118 else {
7119 status = task->tk_status;
7120 rpc_put_task(task);
7121 }
7122 dprintk("<-- %s return %d\n", __func__, status);
7123
7124 return status;
7125}
7126
7127/*
7128 * Initialize the values to be used by the client in CREATE_SESSION
7129 * If nfs4_init_session set the fore channel request and response sizes,
7130 * use them.
7131 *
7132 * Set the back channel max_resp_sz_cached to zero to force the client to
7133 * always set csa_cachethis to FALSE because the current implementation
7134 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7135 */
7136static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7137{
7138 unsigned int max_rqst_sz, max_resp_sz;
7139
7140 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7141 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7142
7143 /* Fore channel attributes */
7144 args->fc_attrs.max_rqst_sz = max_rqst_sz;
7145 args->fc_attrs.max_resp_sz = max_resp_sz;
7146 args->fc_attrs.max_ops = NFS4_MAX_OPS;
7147 args->fc_attrs.max_reqs = max_session_slots;
7148
7149 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7150 "max_ops=%u max_reqs=%u\n",
7151 __func__,
7152 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7153 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7154
7155 /* Back channel attributes */
7156 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7157 args->bc_attrs.max_resp_sz = PAGE_SIZE;
7158 args->bc_attrs.max_resp_sz_cached = 0;
7159 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7160 args->bc_attrs.max_reqs = 1;
7161
7162 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7163 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7164 __func__,
7165 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7166 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7167 args->bc_attrs.max_reqs);
7168}
7169
7170static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7171{
7172 struct nfs4_channel_attrs *sent = &args->fc_attrs;
7173 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7174
7175 if (rcvd->max_resp_sz > sent->max_resp_sz)
7176 return -EINVAL;
7177 /*
7178 * Our requested max_ops is the minimum we need; we're not
7179 * prepared to break up compounds into smaller pieces than that.
7180 * So, no point even trying to continue if the server won't
7181 * cooperate:
7182 */
7183 if (rcvd->max_ops < sent->max_ops)
7184 return -EINVAL;
7185 if (rcvd->max_reqs == 0)
7186 return -EINVAL;
7187 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7188 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7189 return 0;
7190}
7191
7192static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7193{
7194 struct nfs4_channel_attrs *sent = &args->bc_attrs;
7195 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7196
7197 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7198 return -EINVAL;
7199 if (rcvd->max_resp_sz < sent->max_resp_sz)
7200 return -EINVAL;
7201 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7202 return -EINVAL;
7203 /* These would render the backchannel useless: */
7204 if (rcvd->max_ops != sent->max_ops)
7205 return -EINVAL;
7206 if (rcvd->max_reqs != sent->max_reqs)
7207 return -EINVAL;
7208 return 0;
7209}
7210
7211static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7212 struct nfs4_session *session)
7213{
7214 int ret;
7215
7216 ret = nfs4_verify_fore_channel_attrs(args, session);
7217 if (ret)
7218 return ret;
7219 return nfs4_verify_back_channel_attrs(args, session);
7220}
7221
7222static int _nfs4_proc_create_session(struct nfs_client *clp,
7223 struct rpc_cred *cred)
7224{
7225 struct nfs4_session *session = clp->cl_session;
7226 struct nfs41_create_session_args args = {
7227 .client = clp,
7228 .cb_program = NFS4_CALLBACK,
7229 };
7230 struct nfs41_create_session_res res = {
7231 .client = clp,
7232 };
7233 struct rpc_message msg = {
7234 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7235 .rpc_argp = &args,
7236 .rpc_resp = &res,
7237 .rpc_cred = cred,
7238 };
7239 int status;
7240
7241 nfs4_init_channel_attrs(&args);
7242 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7243
7244 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7245 trace_nfs4_create_session(clp, status);
7246
7247 if (!status) {
7248 /* Verify the session's negotiated channel_attrs values */
7249 status = nfs4_verify_channel_attrs(&args, session);
7250 /* Increment the clientid slot sequence id */
7251 clp->cl_seqid++;
7252 }
7253
7254 return status;
7255}
7256
7257/*
7258 * Issues a CREATE_SESSION operation to the server.
7259 * It is the responsibility of the caller to verify the session is
7260 * expired before calling this routine.
7261 */
7262int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7263{
7264 int status;
7265 unsigned *ptr;
7266 struct nfs4_session *session = clp->cl_session;
7267
7268 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7269
7270 status = _nfs4_proc_create_session(clp, cred);
7271 if (status)
7272 goto out;
7273
7274 /* Init or reset the session slot tables */
7275 status = nfs4_setup_session_slot_tables(session);
7276 dprintk("slot table setup returned %d\n", status);
7277 if (status)
7278 goto out;
7279
7280 ptr = (unsigned *)&session->sess_id.data[0];
7281 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7282 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7283out:
7284 dprintk("<-- %s\n", __func__);
7285 return status;
7286}
7287
7288/*
7289 * Issue the over-the-wire RPC DESTROY_SESSION.
7290 * The caller must serialize access to this routine.
7291 */
7292int nfs4_proc_destroy_session(struct nfs4_session *session,
7293 struct rpc_cred *cred)
7294{
7295 struct rpc_message msg = {
7296 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7297 .rpc_argp = session,
7298 .rpc_cred = cred,
7299 };
7300 int status = 0;
7301
7302 dprintk("--> nfs4_proc_destroy_session\n");
7303
7304 /* session is still being setup */
7305 if (session->clp->cl_cons_state != NFS_CS_READY)
7306 return status;
7307
7308 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7309 trace_nfs4_destroy_session(session->clp, status);
7310
7311 if (status)
7312 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7313 "Session has been destroyed regardless...\n", status);
7314
7315 dprintk("<-- nfs4_proc_destroy_session\n");
7316 return status;
7317}
7318
7319/*
7320 * Renew the cl_session lease.
7321 */
7322struct nfs4_sequence_data {
7323 struct nfs_client *clp;
7324 struct nfs4_sequence_args args;
7325 struct nfs4_sequence_res res;
7326};
7327
7328static void nfs41_sequence_release(void *data)
7329{
7330 struct nfs4_sequence_data *calldata = data;
7331 struct nfs_client *clp = calldata->clp;
7332
7333 if (atomic_read(&clp->cl_count) > 1)
7334 nfs4_schedule_state_renewal(clp);
7335 nfs_put_client(clp);
7336 kfree(calldata);
7337}
7338
7339static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7340{
7341 switch(task->tk_status) {
7342 case -NFS4ERR_DELAY:
7343 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7344 return -EAGAIN;
7345 default:
7346 nfs4_schedule_lease_recovery(clp);
7347 }
7348 return 0;
7349}
7350
7351static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7352{
7353 struct nfs4_sequence_data *calldata = data;
7354 struct nfs_client *clp = calldata->clp;
7355
7356 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7357 return;
7358
7359 trace_nfs4_sequence(clp, task->tk_status);
7360 if (task->tk_status < 0) {
7361 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7362 if (atomic_read(&clp->cl_count) == 1)
7363 goto out;
7364
7365 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7366 rpc_restart_call_prepare(task);
7367 return;
7368 }
7369 }
7370 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7371out:
7372 dprintk("<-- %s\n", __func__);
7373}
7374
7375static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7376{
7377 struct nfs4_sequence_data *calldata = data;
7378 struct nfs_client *clp = calldata->clp;
7379 struct nfs4_sequence_args *args;
7380 struct nfs4_sequence_res *res;
7381
7382 args = task->tk_msg.rpc_argp;
7383 res = task->tk_msg.rpc_resp;
7384
7385 nfs41_setup_sequence(clp->cl_session, args, res, task);
7386}
7387
7388static const struct rpc_call_ops nfs41_sequence_ops = {
7389 .rpc_call_done = nfs41_sequence_call_done,
7390 .rpc_call_prepare = nfs41_sequence_prepare,
7391 .rpc_release = nfs41_sequence_release,
7392};
7393
7394static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7395 struct rpc_cred *cred,
7396 bool is_privileged)
7397{
7398 struct nfs4_sequence_data *calldata;
7399 struct rpc_message msg = {
7400 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7401 .rpc_cred = cred,
7402 };
7403 struct rpc_task_setup task_setup_data = {
7404 .rpc_client = clp->cl_rpcclient,
7405 .rpc_message = &msg,
7406 .callback_ops = &nfs41_sequence_ops,
7407 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7408 };
7409
7410 if (!atomic_inc_not_zero(&clp->cl_count))
7411 return ERR_PTR(-EIO);
7412 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7413 if (calldata == NULL) {
7414 nfs_put_client(clp);
7415 return ERR_PTR(-ENOMEM);
7416 }
7417 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7418 if (is_privileged)
7419 nfs4_set_sequence_privileged(&calldata->args);
7420 msg.rpc_argp = &calldata->args;
7421 msg.rpc_resp = &calldata->res;
7422 calldata->clp = clp;
7423 task_setup_data.callback_data = calldata;
7424
7425 return rpc_run_task(&task_setup_data);
7426}
7427
7428static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7429{
7430 struct rpc_task *task;
7431 int ret = 0;
7432
7433 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7434 return -EAGAIN;
7435 task = _nfs41_proc_sequence(clp, cred, false);
7436 if (IS_ERR(task))
7437 ret = PTR_ERR(task);
7438 else
7439 rpc_put_task_async(task);
7440 dprintk("<-- %s status=%d\n", __func__, ret);
7441 return ret;
7442}
7443
7444static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7445{
7446 struct rpc_task *task;
7447 int ret;
7448
7449 task = _nfs41_proc_sequence(clp, cred, true);
7450 if (IS_ERR(task)) {
7451 ret = PTR_ERR(task);
7452 goto out;
7453 }
7454 ret = rpc_wait_for_completion_task(task);
7455 if (!ret) {
7456 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7457
7458 if (task->tk_status == 0)
7459 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7460 ret = task->tk_status;
7461 }
7462 rpc_put_task(task);
7463out:
7464 dprintk("<-- %s status=%d\n", __func__, ret);
7465 return ret;
7466}
7467
7468struct nfs4_reclaim_complete_data {
7469 struct nfs_client *clp;
7470 struct nfs41_reclaim_complete_args arg;
7471 struct nfs41_reclaim_complete_res res;
7472};
7473
7474static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7475{
7476 struct nfs4_reclaim_complete_data *calldata = data;
7477
7478 nfs41_setup_sequence(calldata->clp->cl_session,
7479 &calldata->arg.seq_args,
7480 &calldata->res.seq_res,
7481 task);
7482}
7483
7484static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7485{
7486 switch(task->tk_status) {
7487 case 0:
7488 case -NFS4ERR_COMPLETE_ALREADY:
7489 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7490 break;
7491 case -NFS4ERR_DELAY:
7492 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7493 /* fall through */
7494 case -NFS4ERR_RETRY_UNCACHED_REP:
7495 return -EAGAIN;
7496 default:
7497 nfs4_schedule_lease_recovery(clp);
7498 }
7499 return 0;
7500}
7501
7502static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7503{
7504 struct nfs4_reclaim_complete_data *calldata = data;
7505 struct nfs_client *clp = calldata->clp;
7506 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7507
7508 dprintk("--> %s\n", __func__);
7509 if (!nfs41_sequence_done(task, res))
7510 return;
7511
7512 trace_nfs4_reclaim_complete(clp, task->tk_status);
7513 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7514 rpc_restart_call_prepare(task);
7515 return;
7516 }
7517 dprintk("<-- %s\n", __func__);
7518}
7519
7520static void nfs4_free_reclaim_complete_data(void *data)
7521{
7522 struct nfs4_reclaim_complete_data *calldata = data;
7523
7524 kfree(calldata);
7525}
7526
7527static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7528 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7529 .rpc_call_done = nfs4_reclaim_complete_done,
7530 .rpc_release = nfs4_free_reclaim_complete_data,
7531};
7532
7533/*
7534 * Issue a global reclaim complete.
7535 */
7536static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7537 struct rpc_cred *cred)
7538{
7539 struct nfs4_reclaim_complete_data *calldata;
7540 struct rpc_task *task;
7541 struct rpc_message msg = {
7542 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7543 .rpc_cred = cred,
7544 };
7545 struct rpc_task_setup task_setup_data = {
7546 .rpc_client = clp->cl_rpcclient,
7547 .rpc_message = &msg,
7548 .callback_ops = &nfs4_reclaim_complete_call_ops,
7549 .flags = RPC_TASK_ASYNC,
7550 };
7551 int status = -ENOMEM;
7552
7553 dprintk("--> %s\n", __func__);
7554 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7555 if (calldata == NULL)
7556 goto out;
7557 calldata->clp = clp;
7558 calldata->arg.one_fs = 0;
7559
7560 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7561 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7562 msg.rpc_argp = &calldata->arg;
7563 msg.rpc_resp = &calldata->res;
7564 task_setup_data.callback_data = calldata;
7565 task = rpc_run_task(&task_setup_data);
7566 if (IS_ERR(task)) {
7567 status = PTR_ERR(task);
7568 goto out;
7569 }
7570 status = nfs4_wait_for_completion_rpc_task(task);
7571 if (status == 0)
7572 status = task->tk_status;
7573 rpc_put_task(task);
7574 return 0;
7575out:
7576 dprintk("<-- %s status=%d\n", __func__, status);
7577 return status;
7578}
7579
7580static void
7581nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7582{
7583 struct nfs4_layoutget *lgp = calldata;
7584 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7585 struct nfs4_session *session = nfs4_get_session(server);
7586
7587 dprintk("--> %s\n", __func__);
7588 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7589 * right now covering the LAYOUTGET we are about to send.
7590 * However, that is not so catastrophic, and there seems
7591 * to be no way to prevent it completely.
7592 */
7593 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7594 &lgp->res.seq_res, task))
7595 return;
7596 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7597 NFS_I(lgp->args.inode)->layout,
7598 lgp->args.ctx->state)) {
7599 rpc_exit(task, NFS4_OK);
7600 }
7601}
7602
7603static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7604{
7605 struct nfs4_layoutget *lgp = calldata;
7606 struct inode *inode = lgp->args.inode;
7607 struct nfs_server *server = NFS_SERVER(inode);
7608 struct pnfs_layout_hdr *lo;
7609 struct nfs4_state *state = NULL;
7610 unsigned long timeo, now, giveup;
7611
7612 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7613
7614 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7615 goto out;
7616
7617 switch (task->tk_status) {
7618 case 0:
7619 goto out;
7620 /*
7621 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7622 * (or clients) writing to the same RAID stripe
7623 */
7624 case -NFS4ERR_LAYOUTTRYLATER:
7625 /*
7626 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7627 * existing layout before getting a new one).
7628 */
7629 case -NFS4ERR_RECALLCONFLICT:
7630 timeo = rpc_get_timeout(task->tk_client);
7631 giveup = lgp->args.timestamp + timeo;
7632 now = jiffies;
7633 if (time_after(giveup, now)) {
7634 unsigned long delay;
7635
7636 /* Delay for:
7637 * - Not less then NFS4_POLL_RETRY_MIN.
7638 * - One last time a jiffie before we give up
7639 * - exponential backoff (time_now minus start_attempt)
7640 */
7641 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7642 min((giveup - now - 1),
7643 now - lgp->args.timestamp));
7644
7645 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7646 __func__, delay);
7647 rpc_delay(task, delay);
7648 task->tk_status = 0;
7649 rpc_restart_call_prepare(task);
7650 goto out; /* Do not call nfs4_async_handle_error() */
7651 }
7652 break;
7653 case -NFS4ERR_EXPIRED:
7654 case -NFS4ERR_BAD_STATEID:
7655 spin_lock(&inode->i_lock);
7656 lo = NFS_I(inode)->layout;
7657 if (!lo || list_empty(&lo->plh_segs)) {
7658 spin_unlock(&inode->i_lock);
7659 /* If the open stateid was bad, then recover it. */
7660 state = lgp->args.ctx->state;
7661 } else {
7662 LIST_HEAD(head);
7663
7664 /*
7665 * Mark the bad layout state as invalid, then retry
7666 * with the current stateid.
7667 */
7668 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7669 spin_unlock(&inode->i_lock);
7670 pnfs_free_lseg_list(&head);
7671
7672 task->tk_status = 0;
7673 rpc_restart_call_prepare(task);
7674 }
7675 }
7676 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7677 rpc_restart_call_prepare(task);
7678out:
7679 dprintk("<-- %s\n", __func__);
7680}
7681
7682static size_t max_response_pages(struct nfs_server *server)
7683{
7684 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7685 return nfs_page_array_len(0, max_resp_sz);
7686}
7687
7688static void nfs4_free_pages(struct page **pages, size_t size)
7689{
7690 int i;
7691
7692 if (!pages)
7693 return;
7694
7695 for (i = 0; i < size; i++) {
7696 if (!pages[i])
7697 break;
7698 __free_page(pages[i]);
7699 }
7700 kfree(pages);
7701}
7702
7703static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7704{
7705 struct page **pages;
7706 int i;
7707
7708 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7709 if (!pages) {
7710 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7711 return NULL;
7712 }
7713
7714 for (i = 0; i < size; i++) {
7715 pages[i] = alloc_page(gfp_flags);
7716 if (!pages[i]) {
7717 dprintk("%s: failed to allocate page\n", __func__);
7718 nfs4_free_pages(pages, size);
7719 return NULL;
7720 }
7721 }
7722
7723 return pages;
7724}
7725
7726static void nfs4_layoutget_release(void *calldata)
7727{
7728 struct nfs4_layoutget *lgp = calldata;
7729 struct inode *inode = lgp->args.inode;
7730 struct nfs_server *server = NFS_SERVER(inode);
7731 size_t max_pages = max_response_pages(server);
7732
7733 dprintk("--> %s\n", __func__);
7734 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7735 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7736 put_nfs_open_context(lgp->args.ctx);
7737 kfree(calldata);
7738 dprintk("<-- %s\n", __func__);
7739}
7740
7741static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7742 .rpc_call_prepare = nfs4_layoutget_prepare,
7743 .rpc_call_done = nfs4_layoutget_done,
7744 .rpc_release = nfs4_layoutget_release,
7745};
7746
7747struct pnfs_layout_segment *
7748nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7749{
7750 struct inode *inode = lgp->args.inode;
7751 struct nfs_server *server = NFS_SERVER(inode);
7752 size_t max_pages = max_response_pages(server);
7753 struct rpc_task *task;
7754 struct rpc_message msg = {
7755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7756 .rpc_argp = &lgp->args,
7757 .rpc_resp = &lgp->res,
7758 .rpc_cred = lgp->cred,
7759 };
7760 struct rpc_task_setup task_setup_data = {
7761 .rpc_client = server->client,
7762 .rpc_message = &msg,
7763 .callback_ops = &nfs4_layoutget_call_ops,
7764 .callback_data = lgp,
7765 .flags = RPC_TASK_ASYNC,
7766 };
7767 struct pnfs_layout_segment *lseg = NULL;
7768 int status = 0;
7769
7770 dprintk("--> %s\n", __func__);
7771
7772 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7773 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7774
7775 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7776 if (!lgp->args.layout.pages) {
7777 nfs4_layoutget_release(lgp);
7778 return ERR_PTR(-ENOMEM);
7779 }
7780 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7781 lgp->args.timestamp = jiffies;
7782
7783 lgp->res.layoutp = &lgp->args.layout;
7784 lgp->res.seq_res.sr_slot = NULL;
7785 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7786
7787 task = rpc_run_task(&task_setup_data);
7788 if (IS_ERR(task))
7789 return ERR_CAST(task);
7790 status = nfs4_wait_for_completion_rpc_task(task);
7791 if (status == 0)
7792 status = task->tk_status;
7793 trace_nfs4_layoutget(lgp->args.ctx,
7794 &lgp->args.range,
7795 &lgp->res.range,
7796 status);
7797 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7798 if (status == 0 && lgp->res.layoutp->len)
7799 lseg = pnfs_layout_process(lgp);
7800 rpc_put_task(task);
7801 dprintk("<-- %s status=%d\n", __func__, status);
7802 if (status)
7803 return ERR_PTR(status);
7804 return lseg;
7805}
7806
7807static void
7808nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7809{
7810 struct nfs4_layoutreturn *lrp = calldata;
7811
7812 dprintk("--> %s\n", __func__);
7813 nfs41_setup_sequence(lrp->clp->cl_session,
7814 &lrp->args.seq_args,
7815 &lrp->res.seq_res,
7816 task);
7817}
7818
7819static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7820{
7821 struct nfs4_layoutreturn *lrp = calldata;
7822 struct nfs_server *server;
7823
7824 dprintk("--> %s\n", __func__);
7825
7826 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7827 return;
7828
7829 server = NFS_SERVER(lrp->args.inode);
7830 switch (task->tk_status) {
7831 default:
7832 task->tk_status = 0;
7833 case 0:
7834 break;
7835 case -NFS4ERR_DELAY:
7836 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7837 break;
7838 rpc_restart_call_prepare(task);
7839 return;
7840 }
7841 dprintk("<-- %s\n", __func__);
7842}
7843
7844static void nfs4_layoutreturn_release(void *calldata)
7845{
7846 struct nfs4_layoutreturn *lrp = calldata;
7847 struct pnfs_layout_hdr *lo = lrp->args.layout;
7848
7849 dprintk("--> %s\n", __func__);
7850 spin_lock(&lo->plh_inode->i_lock);
7851 if (lrp->res.lrs_present)
7852 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7853 lo->plh_block_lgets--;
7854 spin_unlock(&lo->plh_inode->i_lock);
7855 pnfs_put_layout_hdr(lrp->args.layout);
7856 kfree(calldata);
7857 dprintk("<-- %s\n", __func__);
7858}
7859
7860static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7861 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7862 .rpc_call_done = nfs4_layoutreturn_done,
7863 .rpc_release = nfs4_layoutreturn_release,
7864};
7865
7866int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7867{
7868 struct rpc_task *task;
7869 struct rpc_message msg = {
7870 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7871 .rpc_argp = &lrp->args,
7872 .rpc_resp = &lrp->res,
7873 .rpc_cred = lrp->cred,
7874 };
7875 struct rpc_task_setup task_setup_data = {
7876 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7877 .rpc_message = &msg,
7878 .callback_ops = &nfs4_layoutreturn_call_ops,
7879 .callback_data = lrp,
7880 };
7881 int status;
7882
7883 dprintk("--> %s\n", __func__);
7884 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7885 task = rpc_run_task(&task_setup_data);
7886 if (IS_ERR(task))
7887 return PTR_ERR(task);
7888 status = task->tk_status;
7889 trace_nfs4_layoutreturn(lrp->args.inode, status);
7890 dprintk("<-- %s status=%d\n", __func__, status);
7891 rpc_put_task(task);
7892 return status;
7893}
7894
7895static int
7896_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7897 struct pnfs_device *pdev,
7898 struct rpc_cred *cred)
7899{
7900 struct nfs4_getdeviceinfo_args args = {
7901 .pdev = pdev,
7902 };
7903 struct nfs4_getdeviceinfo_res res = {
7904 .pdev = pdev,
7905 };
7906 struct rpc_message msg = {
7907 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7908 .rpc_argp = &args,
7909 .rpc_resp = &res,
7910 .rpc_cred = cred,
7911 };
7912 int status;
7913
7914 dprintk("--> %s\n", __func__);
7915 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7916 dprintk("<-- %s status=%d\n", __func__, status);
7917
7918 return status;
7919}
7920
7921int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7922 struct pnfs_device *pdev,
7923 struct rpc_cred *cred)
7924{
7925 struct nfs4_exception exception = { };
7926 int err;
7927
7928 do {
7929 err = nfs4_handle_exception(server,
7930 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7931 &exception);
7932 } while (exception.retry);
7933 return err;
7934}
7935EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7936
7937static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7938{
7939 struct nfs4_layoutcommit_data *data = calldata;
7940 struct nfs_server *server = NFS_SERVER(data->args.inode);
7941 struct nfs4_session *session = nfs4_get_session(server);
7942
7943 nfs41_setup_sequence(session,
7944 &data->args.seq_args,
7945 &data->res.seq_res,
7946 task);
7947}
7948
7949static void
7950nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7951{
7952 struct nfs4_layoutcommit_data *data = calldata;
7953 struct nfs_server *server = NFS_SERVER(data->args.inode);
7954
7955 if (!nfs41_sequence_done(task, &data->res.seq_res))
7956 return;
7957
7958 switch (task->tk_status) { /* Just ignore these failures */
7959 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7960 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7961 case -NFS4ERR_BADLAYOUT: /* no layout */
7962 case -NFS4ERR_GRACE: /* loca_recalim always false */
7963 task->tk_status = 0;
7964 case 0:
7965 break;
7966 default:
7967 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7968 rpc_restart_call_prepare(task);
7969 return;
7970 }
7971 }
7972}
7973
7974static void nfs4_layoutcommit_release(void *calldata)
7975{
7976 struct nfs4_layoutcommit_data *data = calldata;
7977
7978 pnfs_cleanup_layoutcommit(data);
7979 nfs_post_op_update_inode_force_wcc(data->args.inode,
7980 data->res.fattr);
7981 put_rpccred(data->cred);
7982 kfree(data);
7983}
7984
7985static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7986 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7987 .rpc_call_done = nfs4_layoutcommit_done,
7988 .rpc_release = nfs4_layoutcommit_release,
7989};
7990
7991int
7992nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7993{
7994 struct rpc_message msg = {
7995 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7996 .rpc_argp = &data->args,
7997 .rpc_resp = &data->res,
7998 .rpc_cred = data->cred,
7999 };
8000 struct rpc_task_setup task_setup_data = {
8001 .task = &data->task,
8002 .rpc_client = NFS_CLIENT(data->args.inode),
8003 .rpc_message = &msg,
8004 .callback_ops = &nfs4_layoutcommit_ops,
8005 .callback_data = data,
8006 .flags = RPC_TASK_ASYNC,
8007 };
8008 struct rpc_task *task;
8009 int status = 0;
8010
8011 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
8012 "lbw: %llu inode %lu\n",
8013 data->task.tk_pid, sync,
8014 data->args.lastbytewritten,
8015 data->args.inode->i_ino);
8016
8017 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8018 task = rpc_run_task(&task_setup_data);
8019 if (IS_ERR(task))
8020 return PTR_ERR(task);
8021 if (sync == false)
8022 goto out;
8023 status = nfs4_wait_for_completion_rpc_task(task);
8024 if (status != 0)
8025 goto out;
8026 status = task->tk_status;
8027 trace_nfs4_layoutcommit(data->args.inode, status);
8028out:
8029 dprintk("%s: status %d\n", __func__, status);
8030 rpc_put_task(task);
8031 return status;
8032}
8033
8034/**
8035 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8036 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8037 */
8038static int
8039_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8040 struct nfs_fsinfo *info,
8041 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8042{
8043 struct nfs41_secinfo_no_name_args args = {
8044 .style = SECINFO_STYLE_CURRENT_FH,
8045 };
8046 struct nfs4_secinfo_res res = {
8047 .flavors = flavors,
8048 };
8049 struct rpc_message msg = {
8050 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8051 .rpc_argp = &args,
8052 .rpc_resp = &res,
8053 };
8054 struct rpc_clnt *clnt = server->client;
8055 struct rpc_cred *cred = NULL;
8056 int status;
8057
8058 if (use_integrity) {
8059 clnt = server->nfs_client->cl_rpcclient;
8060 cred = nfs4_get_clid_cred(server->nfs_client);
8061 msg.rpc_cred = cred;
8062 }
8063
8064 dprintk("--> %s\n", __func__);
8065 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8066 &res.seq_res, 0);
8067 dprintk("<-- %s status=%d\n", __func__, status);
8068
8069 if (cred)
8070 put_rpccred(cred);
8071
8072 return status;
8073}
8074
8075static int
8076nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8077 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8078{
8079 struct nfs4_exception exception = { };
8080 int err;
8081 do {
8082 /* first try using integrity protection */
8083 err = -NFS4ERR_WRONGSEC;
8084
8085 /* try to use integrity protection with machine cred */
8086 if (_nfs4_is_integrity_protected(server->nfs_client))
8087 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8088 flavors, true);
8089
8090 /*
8091 * if unable to use integrity protection, or SECINFO with
8092 * integrity protection returns NFS4ERR_WRONGSEC (which is
8093 * disallowed by spec, but exists in deployed servers) use
8094 * the current filesystem's rpc_client and the user cred.
8095 */
8096 if (err == -NFS4ERR_WRONGSEC)
8097 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8098 flavors, false);
8099
8100 switch (err) {
8101 case 0:
8102 case -NFS4ERR_WRONGSEC:
8103 case -ENOTSUPP:
8104 goto out;
8105 default:
8106 err = nfs4_handle_exception(server, err, &exception);
8107 }
8108 } while (exception.retry);
8109out:
8110 return err;
8111}
8112
8113static int
8114nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8115 struct nfs_fsinfo *info)
8116{
8117 int err;
8118 struct page *page;
8119 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8120 struct nfs4_secinfo_flavors *flavors;
8121 struct nfs4_secinfo4 *secinfo;
8122 int i;
8123
8124 page = alloc_page(GFP_KERNEL);
8125 if (!page) {
8126 err = -ENOMEM;
8127 goto out;
8128 }
8129
8130 flavors = page_address(page);
8131 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8132
8133 /*
8134 * Fall back on "guess and check" method if
8135 * the server doesn't support SECINFO_NO_NAME
8136 */
8137 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8138 err = nfs4_find_root_sec(server, fhandle, info);
8139 goto out_freepage;
8140 }
8141 if (err)
8142 goto out_freepage;
8143
8144 for (i = 0; i < flavors->num_flavors; i++) {
8145 secinfo = &flavors->flavors[i];
8146
8147 switch (secinfo->flavor) {
8148 case RPC_AUTH_NULL:
8149 case RPC_AUTH_UNIX:
8150 case RPC_AUTH_GSS:
8151 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8152 &secinfo->flavor_info);
8153 break;
8154 default:
8155 flavor = RPC_AUTH_MAXFLAVOR;
8156 break;
8157 }
8158
8159 if (!nfs_auth_info_match(&server->auth_info, flavor))
8160 flavor = RPC_AUTH_MAXFLAVOR;
8161
8162 if (flavor != RPC_AUTH_MAXFLAVOR) {
8163 err = nfs4_lookup_root_sec(server, fhandle,
8164 info, flavor);
8165 if (!err)
8166 break;
8167 }
8168 }
8169
8170 if (flavor == RPC_AUTH_MAXFLAVOR)
8171 err = -EPERM;
8172
8173out_freepage:
8174 put_page(page);
8175 if (err == -EACCES)
8176 return -EPERM;
8177out:
8178 return err;
8179}
8180
8181static int _nfs41_test_stateid(struct nfs_server *server,
8182 nfs4_stateid *stateid,
8183 struct rpc_cred *cred)
8184{
8185 int status;
8186 struct nfs41_test_stateid_args args = {
8187 .stateid = stateid,
8188 };
8189 struct nfs41_test_stateid_res res;
8190 struct rpc_message msg = {
8191 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8192 .rpc_argp = &args,
8193 .rpc_resp = &res,
8194 .rpc_cred = cred,
8195 };
8196 struct rpc_clnt *rpc_client = server->client;
8197
8198 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8199 &rpc_client, &msg);
8200
8201 dprintk("NFS call test_stateid %p\n", stateid);
8202 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8203 nfs4_set_sequence_privileged(&args.seq_args);
8204 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8205 &args.seq_args, &res.seq_res);
8206 if (status != NFS_OK) {
8207 dprintk("NFS reply test_stateid: failed, %d\n", status);
8208 return status;
8209 }
8210 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8211 return -res.status;
8212}
8213
8214/**
8215 * nfs41_test_stateid - perform a TEST_STATEID operation
8216 *
8217 * @server: server / transport on which to perform the operation
8218 * @stateid: state ID to test
8219 * @cred: credential
8220 *
8221 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8222 * Otherwise a negative NFS4ERR value is returned if the operation
8223 * failed or the state ID is not currently valid.
8224 */
8225static int nfs41_test_stateid(struct nfs_server *server,
8226 nfs4_stateid *stateid,
8227 struct rpc_cred *cred)
8228{
8229 struct nfs4_exception exception = { };
8230 int err;
8231 do {
8232 err = _nfs41_test_stateid(server, stateid, cred);
8233 if (err != -NFS4ERR_DELAY)
8234 break;
8235 nfs4_handle_exception(server, err, &exception);
8236 } while (exception.retry);
8237 return err;
8238}
8239
8240struct nfs_free_stateid_data {
8241 struct nfs_server *server;
8242 struct nfs41_free_stateid_args args;
8243 struct nfs41_free_stateid_res res;
8244};
8245
8246static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8247{
8248 struct nfs_free_stateid_data *data = calldata;
8249 nfs41_setup_sequence(nfs4_get_session(data->server),
8250 &data->args.seq_args,
8251 &data->res.seq_res,
8252 task);
8253}
8254
8255static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8256{
8257 struct nfs_free_stateid_data *data = calldata;
8258
8259 nfs41_sequence_done(task, &data->res.seq_res);
8260
8261 switch (task->tk_status) {
8262 case -NFS4ERR_DELAY:
8263 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8264 rpc_restart_call_prepare(task);
8265 }
8266}
8267
8268static void nfs41_free_stateid_release(void *calldata)
8269{
8270 kfree(calldata);
8271}
8272
8273static const struct rpc_call_ops nfs41_free_stateid_ops = {
8274 .rpc_call_prepare = nfs41_free_stateid_prepare,
8275 .rpc_call_done = nfs41_free_stateid_done,
8276 .rpc_release = nfs41_free_stateid_release,
8277};
8278
8279static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8280 nfs4_stateid *stateid,
8281 struct rpc_cred *cred,
8282 bool privileged)
8283{
8284 struct rpc_message msg = {
8285 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8286 .rpc_cred = cred,
8287 };
8288 struct rpc_task_setup task_setup = {
8289 .rpc_client = server->client,
8290 .rpc_message = &msg,
8291 .callback_ops = &nfs41_free_stateid_ops,
8292 .flags = RPC_TASK_ASYNC,
8293 };
8294 struct nfs_free_stateid_data *data;
8295
8296 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8297 &task_setup.rpc_client, &msg);
8298
8299 dprintk("NFS call free_stateid %p\n", stateid);
8300 data = kmalloc(sizeof(*data), GFP_NOFS);
8301 if (!data)
8302 return ERR_PTR(-ENOMEM);
8303 data->server = server;
8304 nfs4_stateid_copy(&data->args.stateid, stateid);
8305
8306 task_setup.callback_data = data;
8307
8308 msg.rpc_argp = &data->args;
8309 msg.rpc_resp = &data->res;
8310 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8311 if (privileged)
8312 nfs4_set_sequence_privileged(&data->args.seq_args);
8313
8314 return rpc_run_task(&task_setup);
8315}
8316
8317/**
8318 * nfs41_free_stateid - perform a FREE_STATEID operation
8319 *
8320 * @server: server / transport on which to perform the operation
8321 * @stateid: state ID to release
8322 * @cred: credential
8323 *
8324 * Returns NFS_OK if the server freed "stateid". Otherwise a
8325 * negative NFS4ERR value is returned.
8326 */
8327static int nfs41_free_stateid(struct nfs_server *server,
8328 nfs4_stateid *stateid,
8329 struct rpc_cred *cred)
8330{
8331 struct rpc_task *task;
8332 int ret;
8333
8334 task = _nfs41_free_stateid(server, stateid, cred, true);
8335 if (IS_ERR(task))
8336 return PTR_ERR(task);
8337 ret = rpc_wait_for_completion_task(task);
8338 if (!ret)
8339 ret = task->tk_status;
8340 rpc_put_task(task);
8341 return ret;
8342}
8343
8344static void
8345nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8346{
8347 struct rpc_task *task;
8348 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8349
8350 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8351 nfs4_free_lock_state(server, lsp);
8352 if (IS_ERR(task))
8353 return;
8354 rpc_put_task(task);
8355}
8356
8357static bool nfs41_match_stateid(const nfs4_stateid *s1,
8358 const nfs4_stateid *s2)
8359{
8360 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8361 return false;
8362
8363 if (s1->seqid == s2->seqid)
8364 return true;
8365 if (s1->seqid == 0 || s2->seqid == 0)
8366 return true;
8367
8368 return false;
8369}
8370
8371#endif /* CONFIG_NFS_V4_1 */
8372
8373static bool nfs4_match_stateid(const nfs4_stateid *s1,
8374 const nfs4_stateid *s2)
8375{
8376 return nfs4_stateid_match(s1, s2);
8377}
8378
8379
8380static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8381 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8382 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8383 .recover_open = nfs4_open_reclaim,
8384 .recover_lock = nfs4_lock_reclaim,
8385 .establish_clid = nfs4_init_clientid,
8386 .detect_trunking = nfs40_discover_server_trunking,
8387};
8388
8389#if defined(CONFIG_NFS_V4_1)
8390static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8391 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8392 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8393 .recover_open = nfs4_open_reclaim,
8394 .recover_lock = nfs4_lock_reclaim,
8395 .establish_clid = nfs41_init_clientid,
8396 .reclaim_complete = nfs41_proc_reclaim_complete,
8397 .detect_trunking = nfs41_discover_server_trunking,
8398};
8399#endif /* CONFIG_NFS_V4_1 */
8400
8401static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8402 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8403 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8404 .recover_open = nfs40_open_expired,
8405 .recover_lock = nfs4_lock_expired,
8406 .establish_clid = nfs4_init_clientid,
8407};
8408
8409#if defined(CONFIG_NFS_V4_1)
8410static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8411 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8412 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8413 .recover_open = nfs41_open_expired,
8414 .recover_lock = nfs41_lock_expired,
8415 .establish_clid = nfs41_init_clientid,
8416};
8417#endif /* CONFIG_NFS_V4_1 */
8418
8419static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8420 .sched_state_renewal = nfs4_proc_async_renew,
8421 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8422 .renew_lease = nfs4_proc_renew,
8423};
8424
8425#if defined(CONFIG_NFS_V4_1)
8426static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8427 .sched_state_renewal = nfs41_proc_async_sequence,
8428 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8429 .renew_lease = nfs4_proc_sequence,
8430};
8431#endif
8432
8433static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8434 .get_locations = _nfs40_proc_get_locations,
8435 .fsid_present = _nfs40_proc_fsid_present,
8436};
8437
8438#if defined(CONFIG_NFS_V4_1)
8439static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8440 .get_locations = _nfs41_proc_get_locations,
8441 .fsid_present = _nfs41_proc_fsid_present,
8442};
8443#endif /* CONFIG_NFS_V4_1 */
8444
8445static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8446 .minor_version = 0,
8447 .init_caps = NFS_CAP_READDIRPLUS
8448 | NFS_CAP_ATOMIC_OPEN
8449 | NFS_CAP_CHANGE_ATTR
8450 | NFS_CAP_POSIX_LOCK,
8451 .init_client = nfs40_init_client,
8452 .shutdown_client = nfs40_shutdown_client,
8453 .match_stateid = nfs4_match_stateid,
8454 .find_root_sec = nfs4_find_root_sec,
8455 .free_lock_state = nfs4_release_lockowner,
8456 .alloc_seqid = nfs_alloc_seqid,
8457 .call_sync_ops = &nfs40_call_sync_ops,
8458 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8459 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8460 .state_renewal_ops = &nfs40_state_renewal_ops,
8461 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8462};
8463
8464#if defined(CONFIG_NFS_V4_1)
8465static struct nfs_seqid *
8466nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8467{
8468 return NULL;
8469}
8470
8471static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8472 .minor_version = 1,
8473 .init_caps = NFS_CAP_READDIRPLUS
8474 | NFS_CAP_ATOMIC_OPEN
8475 | NFS_CAP_CHANGE_ATTR
8476 | NFS_CAP_POSIX_LOCK
8477 | NFS_CAP_STATEID_NFSV41
8478 | NFS_CAP_ATOMIC_OPEN_V1,
8479 .init_client = nfs41_init_client,
8480 .shutdown_client = nfs41_shutdown_client,
8481 .match_stateid = nfs41_match_stateid,
8482 .find_root_sec = nfs41_find_root_sec,
8483 .free_lock_state = nfs41_free_lock_state,
8484 .alloc_seqid = nfs_alloc_no_seqid,
8485 .call_sync_ops = &nfs41_call_sync_ops,
8486 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8487 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8488 .state_renewal_ops = &nfs41_state_renewal_ops,
8489 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8490};
8491#endif
8492
8493#if defined(CONFIG_NFS_V4_2)
8494static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8495 .minor_version = 2,
8496 .init_caps = NFS_CAP_READDIRPLUS
8497 | NFS_CAP_ATOMIC_OPEN
8498 | NFS_CAP_CHANGE_ATTR
8499 | NFS_CAP_POSIX_LOCK
8500 | NFS_CAP_STATEID_NFSV41
8501 | NFS_CAP_ATOMIC_OPEN_V1
8502 | NFS_CAP_ALLOCATE
8503 | NFS_CAP_DEALLOCATE
8504 | NFS_CAP_SEEK,
8505 .init_client = nfs41_init_client,
8506 .shutdown_client = nfs41_shutdown_client,
8507 .match_stateid = nfs41_match_stateid,
8508 .find_root_sec = nfs41_find_root_sec,
8509 .free_lock_state = nfs41_free_lock_state,
8510 .call_sync_ops = &nfs41_call_sync_ops,
8511 .alloc_seqid = nfs_alloc_no_seqid,
8512 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8513 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8514 .state_renewal_ops = &nfs41_state_renewal_ops,
8515};
8516#endif
8517
8518const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8519 [0] = &nfs_v4_0_minor_ops,
8520#if defined(CONFIG_NFS_V4_1)
8521 [1] = &nfs_v4_1_minor_ops,
8522#endif
8523#if defined(CONFIG_NFS_V4_2)
8524 [2] = &nfs_v4_2_minor_ops,
8525#endif
8526};
8527
8528static const struct inode_operations nfs4_dir_inode_operations = {
8529 .create = nfs_create,
8530 .lookup = nfs_lookup,
8531 .atomic_open = nfs_atomic_open,
8532 .link = nfs_link,
8533 .unlink = nfs_unlink,
8534 .symlink = nfs_symlink,
8535 .mkdir = nfs_mkdir,
8536 .rmdir = nfs_rmdir,
8537 .mknod = nfs_mknod,
8538 .rename = nfs_rename,
8539 .permission = nfs_permission,
8540 .getattr = nfs_getattr,
8541 .setattr = nfs_setattr,
8542 .getxattr = generic_getxattr,
8543 .setxattr = generic_setxattr,
8544 .listxattr = generic_listxattr,
8545 .removexattr = generic_removexattr,
8546};
8547
8548static const struct inode_operations nfs4_file_inode_operations = {
8549 .permission = nfs_permission,
8550 .getattr = nfs_getattr,
8551 .setattr = nfs_setattr,
8552 .getxattr = generic_getxattr,
8553 .setxattr = generic_setxattr,
8554 .listxattr = generic_listxattr,
8555 .removexattr = generic_removexattr,
8556};
8557
8558const struct nfs_rpc_ops nfs_v4_clientops = {
8559 .version = 4, /* protocol version */
8560 .dentry_ops = &nfs4_dentry_operations,
8561 .dir_inode_ops = &nfs4_dir_inode_operations,
8562 .file_inode_ops = &nfs4_file_inode_operations,
8563 .file_ops = &nfs4_file_operations,
8564 .getroot = nfs4_proc_get_root,
8565 .submount = nfs4_submount,
8566 .try_mount = nfs4_try_mount,
8567 .getattr = nfs4_proc_getattr,
8568 .setattr = nfs4_proc_setattr,
8569 .lookup = nfs4_proc_lookup,
8570 .access = nfs4_proc_access,
8571 .readlink = nfs4_proc_readlink,
8572 .create = nfs4_proc_create,
8573 .remove = nfs4_proc_remove,
8574 .unlink_setup = nfs4_proc_unlink_setup,
8575 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8576 .unlink_done = nfs4_proc_unlink_done,
8577 .rename_setup = nfs4_proc_rename_setup,
8578 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8579 .rename_done = nfs4_proc_rename_done,
8580 .link = nfs4_proc_link,
8581 .symlink = nfs4_proc_symlink,
8582 .mkdir = nfs4_proc_mkdir,
8583 .rmdir = nfs4_proc_remove,
8584 .readdir = nfs4_proc_readdir,
8585 .mknod = nfs4_proc_mknod,
8586 .statfs = nfs4_proc_statfs,
8587 .fsinfo = nfs4_proc_fsinfo,
8588 .pathconf = nfs4_proc_pathconf,
8589 .set_capabilities = nfs4_server_capabilities,
8590 .decode_dirent = nfs4_decode_dirent,
8591 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8592 .read_setup = nfs4_proc_read_setup,
8593 .read_done = nfs4_read_done,
8594 .write_setup = nfs4_proc_write_setup,
8595 .write_done = nfs4_write_done,
8596 .commit_setup = nfs4_proc_commit_setup,
8597 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8598 .commit_done = nfs4_commit_done,
8599 .lock = nfs4_proc_lock,
8600 .clear_acl_cache = nfs4_zap_acl_attr,
8601 .close_context = nfs4_close_context,
8602 .open_context = nfs4_atomic_open,
8603 .have_delegation = nfs4_have_delegation,
8604 .return_delegation = nfs4_inode_return_delegation,
8605 .alloc_client = nfs4_alloc_client,
8606 .init_client = nfs4_init_client,
8607 .free_client = nfs4_free_client,
8608 .create_server = nfs4_create_server,
8609 .clone_server = nfs_clone_server,
8610};
8611
8612static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8613 .prefix = XATTR_NAME_NFSV4_ACL,
8614 .list = nfs4_xattr_list_nfs4_acl,
8615 .get = nfs4_xattr_get_nfs4_acl,
8616 .set = nfs4_xattr_set_nfs4_acl,
8617};
8618
8619const struct xattr_handler *nfs4_xattr_handlers[] = {
8620 &nfs4_xattr_nfs4_acl_handler,
8621#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8622 &nfs4_xattr_nfs4_label_handler,
8623#endif
8624 NULL
8625};
8626
8627/*
8628 * Local variables:
8629 * c-basic-offset: 8
8630 * End:
8631 */
Linux 6.x block layer and io_uring tree(s)