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nfs: Add ALLOCATE support
[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 nfs4_opendata *p;
981
982 p = kzalloc(sizeof(*p), gfp_mask);
983 if (p == NULL)
984 goto err;
985
986 p->f_label = nfs4_label_alloc(server, gfp_mask);
987 if (IS_ERR(p->f_label))
988 goto err_free_p;
989
990 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
991 if (p->o_arg.seqid == NULL)
992 goto err_free_label;
993 nfs_sb_active(dentry->d_sb);
994 p->dentry = dget(dentry);
995 p->dir = parent;
996 p->owner = sp;
997 atomic_inc(&sp->so_count);
998 p->o_arg.open_flags = flags;
999 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1000 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1001 * will return permission denied for all bits until close */
1002 if (!(flags & O_EXCL)) {
1003 /* ask server to check for all possible rights as results
1004 * are cached */
1005 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1006 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1007 }
1008 p->o_arg.clientid = server->nfs_client->cl_clientid;
1009 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1010 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1011 p->o_arg.name = &dentry->d_name;
1012 p->o_arg.server = server;
1013 p->o_arg.bitmask = nfs4_bitmask(server, label);
1014 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1015 p->o_arg.label = label;
1016 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1017 switch (p->o_arg.claim) {
1018 case NFS4_OPEN_CLAIM_NULL:
1019 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1020 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1021 p->o_arg.fh = NFS_FH(dir);
1022 break;
1023 case NFS4_OPEN_CLAIM_PREVIOUS:
1024 case NFS4_OPEN_CLAIM_FH:
1025 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1026 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1027 p->o_arg.fh = NFS_FH(dentry->d_inode);
1028 }
1029 if (attrs != NULL && attrs->ia_valid != 0) {
1030 __u32 verf[2];
1031
1032 p->o_arg.u.attrs = &p->attrs;
1033 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1034
1035 verf[0] = jiffies;
1036 verf[1] = current->pid;
1037 memcpy(p->o_arg.u.verifier.data, verf,
1038 sizeof(p->o_arg.u.verifier.data));
1039 }
1040 p->c_arg.fh = &p->o_res.fh;
1041 p->c_arg.stateid = &p->o_res.stateid;
1042 p->c_arg.seqid = p->o_arg.seqid;
1043 nfs4_init_opendata_res(p);
1044 kref_init(&p->kref);
1045 return p;
1046
1047err_free_label:
1048 nfs4_label_free(p->f_label);
1049err_free_p:
1050 kfree(p);
1051err:
1052 dput(parent);
1053 return NULL;
1054}
1055
1056static void nfs4_opendata_free(struct kref *kref)
1057{
1058 struct nfs4_opendata *p = container_of(kref,
1059 struct nfs4_opendata, kref);
1060 struct super_block *sb = p->dentry->d_sb;
1061
1062 nfs_free_seqid(p->o_arg.seqid);
1063 if (p->state != NULL)
1064 nfs4_put_open_state(p->state);
1065 nfs4_put_state_owner(p->owner);
1066
1067 nfs4_label_free(p->f_label);
1068
1069 dput(p->dir);
1070 dput(p->dentry);
1071 nfs_sb_deactive(sb);
1072 nfs_fattr_free_names(&p->f_attr);
1073 kfree(p->f_attr.mdsthreshold);
1074 kfree(p);
1075}
1076
1077static void nfs4_opendata_put(struct nfs4_opendata *p)
1078{
1079 if (p != NULL)
1080 kref_put(&p->kref, nfs4_opendata_free);
1081}
1082
1083static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1084{
1085 int ret;
1086
1087 ret = rpc_wait_for_completion_task(task);
1088 return ret;
1089}
1090
1091static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1092{
1093 int ret = 0;
1094
1095 if (open_mode & (O_EXCL|O_TRUNC))
1096 goto out;
1097 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1098 case FMODE_READ:
1099 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1100 && state->n_rdonly != 0;
1101 break;
1102 case FMODE_WRITE:
1103 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1104 && state->n_wronly != 0;
1105 break;
1106 case FMODE_READ|FMODE_WRITE:
1107 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1108 && state->n_rdwr != 0;
1109 }
1110out:
1111 return ret;
1112}
1113
1114static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1115{
1116 if (delegation == NULL)
1117 return 0;
1118 if ((delegation->type & fmode) != fmode)
1119 return 0;
1120 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
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_clear_open_stateid_locked(struct nfs4_state *state,
1173 nfs4_stateid *stateid, fmode_t fmode)
1174{
1175 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1176 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1177 case FMODE_WRITE:
1178 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1179 break;
1180 case FMODE_READ:
1181 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1182 break;
1183 case 0:
1184 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1185 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1186 clear_bit(NFS_OPEN_STATE, &state->flags);
1187 }
1188 if (stateid == NULL)
1189 return;
1190 if (!nfs_need_update_open_stateid(state, stateid))
1191 return;
1192 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1193 nfs4_stateid_copy(&state->stateid, stateid);
1194 nfs4_stateid_copy(&state->open_stateid, stateid);
1195}
1196
1197static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1198{
1199 write_seqlock(&state->seqlock);
1200 nfs_clear_open_stateid_locked(state, stateid, fmode);
1201 write_sequnlock(&state->seqlock);
1202 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1203 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1204}
1205
1206static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1207{
1208 switch (fmode) {
1209 case FMODE_READ:
1210 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1211 break;
1212 case FMODE_WRITE:
1213 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1214 break;
1215 case FMODE_READ|FMODE_WRITE:
1216 set_bit(NFS_O_RDWR_STATE, &state->flags);
1217 }
1218 if (!nfs_need_update_open_stateid(state, stateid))
1219 return;
1220 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1221 nfs4_stateid_copy(&state->stateid, stateid);
1222 nfs4_stateid_copy(&state->open_stateid, stateid);
1223}
1224
1225static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1226{
1227 /*
1228 * Protect the call to nfs4_state_set_mode_locked and
1229 * serialise the stateid update
1230 */
1231 write_seqlock(&state->seqlock);
1232 if (deleg_stateid != NULL) {
1233 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1234 set_bit(NFS_DELEGATED_STATE, &state->flags);
1235 }
1236 if (open_stateid != NULL)
1237 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1238 write_sequnlock(&state->seqlock);
1239 spin_lock(&state->owner->so_lock);
1240 update_open_stateflags(state, fmode);
1241 spin_unlock(&state->owner->so_lock);
1242}
1243
1244static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1245{
1246 struct nfs_inode *nfsi = NFS_I(state->inode);
1247 struct nfs_delegation *deleg_cur;
1248 int ret = 0;
1249
1250 fmode &= (FMODE_READ|FMODE_WRITE);
1251
1252 rcu_read_lock();
1253 deleg_cur = rcu_dereference(nfsi->delegation);
1254 if (deleg_cur == NULL)
1255 goto no_delegation;
1256
1257 spin_lock(&deleg_cur->lock);
1258 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1259 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1260 (deleg_cur->type & fmode) != fmode)
1261 goto no_delegation_unlock;
1262
1263 if (delegation == NULL)
1264 delegation = &deleg_cur->stateid;
1265 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1266 goto no_delegation_unlock;
1267
1268 nfs_mark_delegation_referenced(deleg_cur);
1269 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1270 ret = 1;
1271no_delegation_unlock:
1272 spin_unlock(&deleg_cur->lock);
1273no_delegation:
1274 rcu_read_unlock();
1275
1276 if (!ret && open_stateid != NULL) {
1277 __update_open_stateid(state, open_stateid, NULL, fmode);
1278 ret = 1;
1279 }
1280 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1281 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1282
1283 return ret;
1284}
1285
1286
1287static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1288{
1289 struct nfs_delegation *delegation;
1290
1291 rcu_read_lock();
1292 delegation = rcu_dereference(NFS_I(inode)->delegation);
1293 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1294 rcu_read_unlock();
1295 return;
1296 }
1297 rcu_read_unlock();
1298 nfs4_inode_return_delegation(inode);
1299}
1300
1301static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1302{
1303 struct nfs4_state *state = opendata->state;
1304 struct nfs_inode *nfsi = NFS_I(state->inode);
1305 struct nfs_delegation *delegation;
1306 int open_mode = opendata->o_arg.open_flags;
1307 fmode_t fmode = opendata->o_arg.fmode;
1308 nfs4_stateid stateid;
1309 int ret = -EAGAIN;
1310
1311 for (;;) {
1312 spin_lock(&state->owner->so_lock);
1313 if (can_open_cached(state, fmode, open_mode)) {
1314 update_open_stateflags(state, fmode);
1315 spin_unlock(&state->owner->so_lock);
1316 goto out_return_state;
1317 }
1318 spin_unlock(&state->owner->so_lock);
1319 rcu_read_lock();
1320 delegation = rcu_dereference(nfsi->delegation);
1321 if (!can_open_delegated(delegation, fmode)) {
1322 rcu_read_unlock();
1323 break;
1324 }
1325 /* Save the delegation */
1326 nfs4_stateid_copy(&stateid, &delegation->stateid);
1327 rcu_read_unlock();
1328 nfs_release_seqid(opendata->o_arg.seqid);
1329 if (!opendata->is_recover) {
1330 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1331 if (ret != 0)
1332 goto out;
1333 }
1334 ret = -EAGAIN;
1335
1336 /* Try to update the stateid using the delegation */
1337 if (update_open_stateid(state, NULL, &stateid, fmode))
1338 goto out_return_state;
1339 }
1340out:
1341 return ERR_PTR(ret);
1342out_return_state:
1343 atomic_inc(&state->count);
1344 return state;
1345}
1346
1347static void
1348nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1349{
1350 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1351 struct nfs_delegation *delegation;
1352 int delegation_flags = 0;
1353
1354 rcu_read_lock();
1355 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1356 if (delegation)
1357 delegation_flags = delegation->flags;
1358 rcu_read_unlock();
1359 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1360 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1361 "returning a delegation for "
1362 "OPEN(CLAIM_DELEGATE_CUR)\n",
1363 clp->cl_hostname);
1364 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1365 nfs_inode_set_delegation(state->inode,
1366 data->owner->so_cred,
1367 &data->o_res);
1368 else
1369 nfs_inode_reclaim_delegation(state->inode,
1370 data->owner->so_cred,
1371 &data->o_res);
1372}
1373
1374/*
1375 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1376 * and update the nfs4_state.
1377 */
1378static struct nfs4_state *
1379_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1380{
1381 struct inode *inode = data->state->inode;
1382 struct nfs4_state *state = data->state;
1383 int ret;
1384
1385 if (!data->rpc_done) {
1386 if (data->rpc_status) {
1387 ret = data->rpc_status;
1388 goto err;
1389 }
1390 /* cached opens have already been processed */
1391 goto update;
1392 }
1393
1394 ret = nfs_refresh_inode(inode, &data->f_attr);
1395 if (ret)
1396 goto err;
1397
1398 if (data->o_res.delegation_type != 0)
1399 nfs4_opendata_check_deleg(data, state);
1400update:
1401 update_open_stateid(state, &data->o_res.stateid, NULL,
1402 data->o_arg.fmode);
1403 atomic_inc(&state->count);
1404
1405 return state;
1406err:
1407 return ERR_PTR(ret);
1408
1409}
1410
1411static struct nfs4_state *
1412_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1413{
1414 struct inode *inode;
1415 struct nfs4_state *state = NULL;
1416 int ret;
1417
1418 if (!data->rpc_done) {
1419 state = nfs4_try_open_cached(data);
1420 goto out;
1421 }
1422
1423 ret = -EAGAIN;
1424 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1425 goto err;
1426 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1427 ret = PTR_ERR(inode);
1428 if (IS_ERR(inode))
1429 goto err;
1430 ret = -ENOMEM;
1431 state = nfs4_get_open_state(inode, data->owner);
1432 if (state == NULL)
1433 goto err_put_inode;
1434 if (data->o_res.delegation_type != 0)
1435 nfs4_opendata_check_deleg(data, state);
1436 update_open_stateid(state, &data->o_res.stateid, NULL,
1437 data->o_arg.fmode);
1438 iput(inode);
1439out:
1440 nfs_release_seqid(data->o_arg.seqid);
1441 return state;
1442err_put_inode:
1443 iput(inode);
1444err:
1445 return ERR_PTR(ret);
1446}
1447
1448static struct nfs4_state *
1449nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1450{
1451 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1452 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1453 return _nfs4_opendata_to_nfs4_state(data);
1454}
1455
1456static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1457{
1458 struct nfs_inode *nfsi = NFS_I(state->inode);
1459 struct nfs_open_context *ctx;
1460
1461 spin_lock(&state->inode->i_lock);
1462 list_for_each_entry(ctx, &nfsi->open_files, list) {
1463 if (ctx->state != state)
1464 continue;
1465 get_nfs_open_context(ctx);
1466 spin_unlock(&state->inode->i_lock);
1467 return ctx;
1468 }
1469 spin_unlock(&state->inode->i_lock);
1470 return ERR_PTR(-ENOENT);
1471}
1472
1473static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1474 struct nfs4_state *state, enum open_claim_type4 claim)
1475{
1476 struct nfs4_opendata *opendata;
1477
1478 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1479 NULL, NULL, claim, GFP_NOFS);
1480 if (opendata == NULL)
1481 return ERR_PTR(-ENOMEM);
1482 opendata->state = state;
1483 atomic_inc(&state->count);
1484 return opendata;
1485}
1486
1487static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1488{
1489 struct nfs4_state *newstate;
1490 int ret;
1491
1492 opendata->o_arg.open_flags = 0;
1493 opendata->o_arg.fmode = fmode;
1494 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1495 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1496 nfs4_init_opendata_res(opendata);
1497 ret = _nfs4_recover_proc_open(opendata);
1498 if (ret != 0)
1499 return ret;
1500 newstate = nfs4_opendata_to_nfs4_state(opendata);
1501 if (IS_ERR(newstate))
1502 return PTR_ERR(newstate);
1503 nfs4_close_state(newstate, fmode);
1504 *res = newstate;
1505 return 0;
1506}
1507
1508static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1509{
1510 struct nfs4_state *newstate;
1511 int ret;
1512
1513 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1514 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1515 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1516 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1517 /* memory barrier prior to reading state->n_* */
1518 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1519 clear_bit(NFS_OPEN_STATE, &state->flags);
1520 smp_rmb();
1521 if (state->n_rdwr != 0) {
1522 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1523 if (ret != 0)
1524 return ret;
1525 if (newstate != state)
1526 return -ESTALE;
1527 }
1528 if (state->n_wronly != 0) {
1529 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1530 if (ret != 0)
1531 return ret;
1532 if (newstate != state)
1533 return -ESTALE;
1534 }
1535 if (state->n_rdonly != 0) {
1536 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1537 if (ret != 0)
1538 return ret;
1539 if (newstate != state)
1540 return -ESTALE;
1541 }
1542 /*
1543 * We may have performed cached opens for all three recoveries.
1544 * Check if we need to update the current stateid.
1545 */
1546 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1547 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1548 write_seqlock(&state->seqlock);
1549 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1550 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1551 write_sequnlock(&state->seqlock);
1552 }
1553 return 0;
1554}
1555
1556/*
1557 * OPEN_RECLAIM:
1558 * reclaim state on the server after a reboot.
1559 */
1560static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1561{
1562 struct nfs_delegation *delegation;
1563 struct nfs4_opendata *opendata;
1564 fmode_t delegation_type = 0;
1565 int status;
1566
1567 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1568 NFS4_OPEN_CLAIM_PREVIOUS);
1569 if (IS_ERR(opendata))
1570 return PTR_ERR(opendata);
1571 rcu_read_lock();
1572 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1573 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1574 delegation_type = delegation->type;
1575 rcu_read_unlock();
1576 opendata->o_arg.u.delegation_type = delegation_type;
1577 status = nfs4_open_recover(opendata, state);
1578 nfs4_opendata_put(opendata);
1579 return status;
1580}
1581
1582static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1583{
1584 struct nfs_server *server = NFS_SERVER(state->inode);
1585 struct nfs4_exception exception = { };
1586 int err;
1587 do {
1588 err = _nfs4_do_open_reclaim(ctx, state);
1589 trace_nfs4_open_reclaim(ctx, 0, err);
1590 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1591 continue;
1592 if (err != -NFS4ERR_DELAY)
1593 break;
1594 nfs4_handle_exception(server, err, &exception);
1595 } while (exception.retry);
1596 return err;
1597}
1598
1599static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1600{
1601 struct nfs_open_context *ctx;
1602 int ret;
1603
1604 ctx = nfs4_state_find_open_context(state);
1605 if (IS_ERR(ctx))
1606 return -EAGAIN;
1607 ret = nfs4_do_open_reclaim(ctx, state);
1608 put_nfs_open_context(ctx);
1609 return ret;
1610}
1611
1612static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1613{
1614 switch (err) {
1615 default:
1616 printk(KERN_ERR "NFS: %s: unhandled error "
1617 "%d.\n", __func__, err);
1618 case 0:
1619 case -ENOENT:
1620 case -ESTALE:
1621 break;
1622 case -NFS4ERR_BADSESSION:
1623 case -NFS4ERR_BADSLOT:
1624 case -NFS4ERR_BAD_HIGH_SLOT:
1625 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1626 case -NFS4ERR_DEADSESSION:
1627 set_bit(NFS_DELEGATED_STATE, &state->flags);
1628 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1629 return -EAGAIN;
1630 case -NFS4ERR_STALE_CLIENTID:
1631 case -NFS4ERR_STALE_STATEID:
1632 set_bit(NFS_DELEGATED_STATE, &state->flags);
1633 case -NFS4ERR_EXPIRED:
1634 /* Don't recall a delegation if it was lost */
1635 nfs4_schedule_lease_recovery(server->nfs_client);
1636 return -EAGAIN;
1637 case -NFS4ERR_MOVED:
1638 nfs4_schedule_migration_recovery(server);
1639 return -EAGAIN;
1640 case -NFS4ERR_LEASE_MOVED:
1641 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1642 return -EAGAIN;
1643 case -NFS4ERR_DELEG_REVOKED:
1644 case -NFS4ERR_ADMIN_REVOKED:
1645 case -NFS4ERR_BAD_STATEID:
1646 case -NFS4ERR_OPENMODE:
1647 nfs_inode_find_state_and_recover(state->inode,
1648 stateid);
1649 nfs4_schedule_stateid_recovery(server, state);
1650 return -EAGAIN;
1651 case -NFS4ERR_DELAY:
1652 case -NFS4ERR_GRACE:
1653 set_bit(NFS_DELEGATED_STATE, &state->flags);
1654 ssleep(1);
1655 return -EAGAIN;
1656 case -ENOMEM:
1657 case -NFS4ERR_DENIED:
1658 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1659 return 0;
1660 }
1661 return err;
1662}
1663
1664int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1665{
1666 struct nfs_server *server = NFS_SERVER(state->inode);
1667 struct nfs4_opendata *opendata;
1668 int err;
1669
1670 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1671 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1672 if (IS_ERR(opendata))
1673 return PTR_ERR(opendata);
1674 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1675 err = nfs4_open_recover(opendata, state);
1676 nfs4_opendata_put(opendata);
1677 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1678}
1679
1680static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1681{
1682 struct nfs4_opendata *data = calldata;
1683
1684 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1685 &data->c_res.seq_res, task);
1686}
1687
1688static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1689{
1690 struct nfs4_opendata *data = calldata;
1691
1692 nfs40_sequence_done(task, &data->c_res.seq_res);
1693
1694 data->rpc_status = task->tk_status;
1695 if (data->rpc_status == 0) {
1696 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1697 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1698 renew_lease(data->o_res.server, data->timestamp);
1699 data->rpc_done = 1;
1700 }
1701}
1702
1703static void nfs4_open_confirm_release(void *calldata)
1704{
1705 struct nfs4_opendata *data = calldata;
1706 struct nfs4_state *state = NULL;
1707
1708 /* If this request hasn't been cancelled, do nothing */
1709 if (data->cancelled == 0)
1710 goto out_free;
1711 /* In case of error, no cleanup! */
1712 if (!data->rpc_done)
1713 goto out_free;
1714 state = nfs4_opendata_to_nfs4_state(data);
1715 if (!IS_ERR(state))
1716 nfs4_close_state(state, data->o_arg.fmode);
1717out_free:
1718 nfs4_opendata_put(data);
1719}
1720
1721static const struct rpc_call_ops nfs4_open_confirm_ops = {
1722 .rpc_call_prepare = nfs4_open_confirm_prepare,
1723 .rpc_call_done = nfs4_open_confirm_done,
1724 .rpc_release = nfs4_open_confirm_release,
1725};
1726
1727/*
1728 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1729 */
1730static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1731{
1732 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1733 struct rpc_task *task;
1734 struct rpc_message msg = {
1735 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1736 .rpc_argp = &data->c_arg,
1737 .rpc_resp = &data->c_res,
1738 .rpc_cred = data->owner->so_cred,
1739 };
1740 struct rpc_task_setup task_setup_data = {
1741 .rpc_client = server->client,
1742 .rpc_message = &msg,
1743 .callback_ops = &nfs4_open_confirm_ops,
1744 .callback_data = data,
1745 .workqueue = nfsiod_workqueue,
1746 .flags = RPC_TASK_ASYNC,
1747 };
1748 int status;
1749
1750 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1751 kref_get(&data->kref);
1752 data->rpc_done = 0;
1753 data->rpc_status = 0;
1754 data->timestamp = jiffies;
1755 task = rpc_run_task(&task_setup_data);
1756 if (IS_ERR(task))
1757 return PTR_ERR(task);
1758 status = nfs4_wait_for_completion_rpc_task(task);
1759 if (status != 0) {
1760 data->cancelled = 1;
1761 smp_wmb();
1762 } else
1763 status = data->rpc_status;
1764 rpc_put_task(task);
1765 return status;
1766}
1767
1768static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1769{
1770 struct nfs4_opendata *data = calldata;
1771 struct nfs4_state_owner *sp = data->owner;
1772 struct nfs_client *clp = sp->so_server->nfs_client;
1773
1774 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1775 goto out_wait;
1776 /*
1777 * Check if we still need to send an OPEN call, or if we can use
1778 * a delegation instead.
1779 */
1780 if (data->state != NULL) {
1781 struct nfs_delegation *delegation;
1782
1783 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1784 goto out_no_action;
1785 rcu_read_lock();
1786 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1787 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1788 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1789 can_open_delegated(delegation, data->o_arg.fmode))
1790 goto unlock_no_action;
1791 rcu_read_unlock();
1792 }
1793 /* Update client id. */
1794 data->o_arg.clientid = clp->cl_clientid;
1795 switch (data->o_arg.claim) {
1796 case NFS4_OPEN_CLAIM_PREVIOUS:
1797 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1798 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1799 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1800 case NFS4_OPEN_CLAIM_FH:
1801 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1802 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1803 }
1804 data->timestamp = jiffies;
1805 if (nfs4_setup_sequence(data->o_arg.server,
1806 &data->o_arg.seq_args,
1807 &data->o_res.seq_res,
1808 task) != 0)
1809 nfs_release_seqid(data->o_arg.seqid);
1810
1811 /* Set the create mode (note dependency on the session type) */
1812 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1813 if (data->o_arg.open_flags & O_EXCL) {
1814 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1815 if (nfs4_has_persistent_session(clp))
1816 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1817 else if (clp->cl_mvops->minor_version > 0)
1818 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1819 }
1820 return;
1821unlock_no_action:
1822 rcu_read_unlock();
1823out_no_action:
1824 task->tk_action = NULL;
1825out_wait:
1826 nfs4_sequence_done(task, &data->o_res.seq_res);
1827}
1828
1829static void nfs4_open_done(struct rpc_task *task, void *calldata)
1830{
1831 struct nfs4_opendata *data = calldata;
1832
1833 data->rpc_status = task->tk_status;
1834
1835 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1836 return;
1837
1838 if (task->tk_status == 0) {
1839 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1840 switch (data->o_res.f_attr->mode & S_IFMT) {
1841 case S_IFREG:
1842 break;
1843 case S_IFLNK:
1844 data->rpc_status = -ELOOP;
1845 break;
1846 case S_IFDIR:
1847 data->rpc_status = -EISDIR;
1848 break;
1849 default:
1850 data->rpc_status = -ENOTDIR;
1851 }
1852 }
1853 renew_lease(data->o_res.server, data->timestamp);
1854 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1855 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1856 }
1857 data->rpc_done = 1;
1858}
1859
1860static void nfs4_open_release(void *calldata)
1861{
1862 struct nfs4_opendata *data = calldata;
1863 struct nfs4_state *state = NULL;
1864
1865 /* If this request hasn't been cancelled, do nothing */
1866 if (data->cancelled == 0)
1867 goto out_free;
1868 /* In case of error, no cleanup! */
1869 if (data->rpc_status != 0 || !data->rpc_done)
1870 goto out_free;
1871 /* In case we need an open_confirm, no cleanup! */
1872 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1873 goto out_free;
1874 state = nfs4_opendata_to_nfs4_state(data);
1875 if (!IS_ERR(state))
1876 nfs4_close_state(state, data->o_arg.fmode);
1877out_free:
1878 nfs4_opendata_put(data);
1879}
1880
1881static const struct rpc_call_ops nfs4_open_ops = {
1882 .rpc_call_prepare = nfs4_open_prepare,
1883 .rpc_call_done = nfs4_open_done,
1884 .rpc_release = nfs4_open_release,
1885};
1886
1887static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1888{
1889 struct inode *dir = data->dir->d_inode;
1890 struct nfs_server *server = NFS_SERVER(dir);
1891 struct nfs_openargs *o_arg = &data->o_arg;
1892 struct nfs_openres *o_res = &data->o_res;
1893 struct rpc_task *task;
1894 struct rpc_message msg = {
1895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1896 .rpc_argp = o_arg,
1897 .rpc_resp = o_res,
1898 .rpc_cred = data->owner->so_cred,
1899 };
1900 struct rpc_task_setup task_setup_data = {
1901 .rpc_client = server->client,
1902 .rpc_message = &msg,
1903 .callback_ops = &nfs4_open_ops,
1904 .callback_data = data,
1905 .workqueue = nfsiod_workqueue,
1906 .flags = RPC_TASK_ASYNC,
1907 };
1908 int status;
1909
1910 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1911 kref_get(&data->kref);
1912 data->rpc_done = 0;
1913 data->rpc_status = 0;
1914 data->cancelled = 0;
1915 data->is_recover = 0;
1916 if (isrecover) {
1917 nfs4_set_sequence_privileged(&o_arg->seq_args);
1918 data->is_recover = 1;
1919 }
1920 task = rpc_run_task(&task_setup_data);
1921 if (IS_ERR(task))
1922 return PTR_ERR(task);
1923 status = nfs4_wait_for_completion_rpc_task(task);
1924 if (status != 0) {
1925 data->cancelled = 1;
1926 smp_wmb();
1927 } else
1928 status = data->rpc_status;
1929 rpc_put_task(task);
1930
1931 return status;
1932}
1933
1934static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1935{
1936 struct inode *dir = data->dir->d_inode;
1937 struct nfs_openres *o_res = &data->o_res;
1938 int status;
1939
1940 status = nfs4_run_open_task(data, 1);
1941 if (status != 0 || !data->rpc_done)
1942 return status;
1943
1944 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1945
1946 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1947 status = _nfs4_proc_open_confirm(data);
1948 if (status != 0)
1949 return status;
1950 }
1951
1952 return status;
1953}
1954
1955/*
1956 * Additional permission checks in order to distinguish between an
1957 * open for read, and an open for execute. This works around the
1958 * fact that NFSv4 OPEN treats read and execute permissions as being
1959 * the same.
1960 * Note that in the non-execute case, we want to turn off permission
1961 * checking if we just created a new file (POSIX open() semantics).
1962 */
1963static int nfs4_opendata_access(struct rpc_cred *cred,
1964 struct nfs4_opendata *opendata,
1965 struct nfs4_state *state, fmode_t fmode,
1966 int openflags)
1967{
1968 struct nfs_access_entry cache;
1969 u32 mask;
1970
1971 /* access call failed or for some reason the server doesn't
1972 * support any access modes -- defer access call until later */
1973 if (opendata->o_res.access_supported == 0)
1974 return 0;
1975
1976 mask = 0;
1977 /*
1978 * Use openflags to check for exec, because fmode won't
1979 * always have FMODE_EXEC set when file open for exec.
1980 */
1981 if (openflags & __FMODE_EXEC) {
1982 /* ONLY check for exec rights */
1983 mask = MAY_EXEC;
1984 } else if ((fmode & FMODE_READ) && !opendata->file_created)
1985 mask = MAY_READ;
1986
1987 cache.cred = cred;
1988 cache.jiffies = jiffies;
1989 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1990 nfs_access_add_cache(state->inode, &cache);
1991
1992 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1993 return 0;
1994
1995 /* even though OPEN succeeded, access is denied. Close the file */
1996 nfs4_close_state(state, fmode);
1997 return -EACCES;
1998}
1999
2000/*
2001 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2002 */
2003static int _nfs4_proc_open(struct nfs4_opendata *data)
2004{
2005 struct inode *dir = data->dir->d_inode;
2006 struct nfs_server *server = NFS_SERVER(dir);
2007 struct nfs_openargs *o_arg = &data->o_arg;
2008 struct nfs_openres *o_res = &data->o_res;
2009 int status;
2010
2011 status = nfs4_run_open_task(data, 0);
2012 if (!data->rpc_done)
2013 return status;
2014 if (status != 0) {
2015 if (status == -NFS4ERR_BADNAME &&
2016 !(o_arg->open_flags & O_CREAT))
2017 return -ENOENT;
2018 return status;
2019 }
2020
2021 nfs_fattr_map_and_free_names(server, &data->f_attr);
2022
2023 if (o_arg->open_flags & O_CREAT) {
2024 update_changeattr(dir, &o_res->cinfo);
2025 if (o_arg->open_flags & O_EXCL)
2026 data->file_created = 1;
2027 else if (o_res->cinfo.before != o_res->cinfo.after)
2028 data->file_created = 1;
2029 }
2030 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2031 server->caps &= ~NFS_CAP_POSIX_LOCK;
2032 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2033 status = _nfs4_proc_open_confirm(data);
2034 if (status != 0)
2035 return status;
2036 }
2037 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2038 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2039 return 0;
2040}
2041
2042static int nfs4_recover_expired_lease(struct nfs_server *server)
2043{
2044 return nfs4_client_recover_expired_lease(server->nfs_client);
2045}
2046
2047/*
2048 * OPEN_EXPIRED:
2049 * reclaim state on the server after a network partition.
2050 * Assumes caller holds the appropriate lock
2051 */
2052static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2053{
2054 struct nfs4_opendata *opendata;
2055 int ret;
2056
2057 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2058 NFS4_OPEN_CLAIM_FH);
2059 if (IS_ERR(opendata))
2060 return PTR_ERR(opendata);
2061 ret = nfs4_open_recover(opendata, state);
2062 if (ret == -ESTALE)
2063 d_drop(ctx->dentry);
2064 nfs4_opendata_put(opendata);
2065 return ret;
2066}
2067
2068static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2069{
2070 struct nfs_server *server = NFS_SERVER(state->inode);
2071 struct nfs4_exception exception = { };
2072 int err;
2073
2074 do {
2075 err = _nfs4_open_expired(ctx, state);
2076 trace_nfs4_open_expired(ctx, 0, err);
2077 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2078 continue;
2079 switch (err) {
2080 default:
2081 goto out;
2082 case -NFS4ERR_GRACE:
2083 case -NFS4ERR_DELAY:
2084 nfs4_handle_exception(server, err, &exception);
2085 err = 0;
2086 }
2087 } while (exception.retry);
2088out:
2089 return err;
2090}
2091
2092static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2093{
2094 struct nfs_open_context *ctx;
2095 int ret;
2096
2097 ctx = nfs4_state_find_open_context(state);
2098 if (IS_ERR(ctx))
2099 return -EAGAIN;
2100 ret = nfs4_do_open_expired(ctx, state);
2101 put_nfs_open_context(ctx);
2102 return ret;
2103}
2104
2105static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2106{
2107 nfs_remove_bad_delegation(state->inode);
2108 write_seqlock(&state->seqlock);
2109 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2110 write_sequnlock(&state->seqlock);
2111 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2112}
2113
2114static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2115{
2116 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2117 nfs_finish_clear_delegation_stateid(state);
2118}
2119
2120static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2121{
2122 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2123 nfs40_clear_delegation_stateid(state);
2124 return nfs4_open_expired(sp, state);
2125}
2126
2127#if defined(CONFIG_NFS_V4_1)
2128static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2129{
2130 struct nfs_server *server = NFS_SERVER(state->inode);
2131 nfs4_stateid stateid;
2132 struct nfs_delegation *delegation;
2133 struct rpc_cred *cred;
2134 int status;
2135
2136 /* Get the delegation credential for use by test/free_stateid */
2137 rcu_read_lock();
2138 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2139 if (delegation == NULL) {
2140 rcu_read_unlock();
2141 return;
2142 }
2143
2144 nfs4_stateid_copy(&stateid, &delegation->stateid);
2145 cred = get_rpccred(delegation->cred);
2146 rcu_read_unlock();
2147 status = nfs41_test_stateid(server, &stateid, cred);
2148 trace_nfs4_test_delegation_stateid(state, NULL, status);
2149
2150 if (status != NFS_OK) {
2151 /* Free the stateid unless the server explicitly
2152 * informs us the stateid is unrecognized. */
2153 if (status != -NFS4ERR_BAD_STATEID)
2154 nfs41_free_stateid(server, &stateid, cred);
2155 nfs_finish_clear_delegation_stateid(state);
2156 }
2157
2158 put_rpccred(cred);
2159}
2160
2161/**
2162 * nfs41_check_open_stateid - possibly free an open stateid
2163 *
2164 * @state: NFSv4 state for an inode
2165 *
2166 * Returns NFS_OK if recovery for this stateid is now finished.
2167 * Otherwise a negative NFS4ERR value is returned.
2168 */
2169static int nfs41_check_open_stateid(struct nfs4_state *state)
2170{
2171 struct nfs_server *server = NFS_SERVER(state->inode);
2172 nfs4_stateid *stateid = &state->open_stateid;
2173 struct rpc_cred *cred = state->owner->so_cred;
2174 int status;
2175
2176 /* If a state reset has been done, test_stateid is unneeded */
2177 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2178 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2179 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2180 return -NFS4ERR_BAD_STATEID;
2181
2182 status = nfs41_test_stateid(server, stateid, cred);
2183 trace_nfs4_test_open_stateid(state, NULL, status);
2184 if (status != NFS_OK) {
2185 /* Free the stateid unless the server explicitly
2186 * informs us the stateid is unrecognized. */
2187 if (status != -NFS4ERR_BAD_STATEID)
2188 nfs41_free_stateid(server, stateid, cred);
2189
2190 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2191 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2192 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2193 clear_bit(NFS_OPEN_STATE, &state->flags);
2194 }
2195 return status;
2196}
2197
2198static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2199{
2200 int status;
2201
2202 nfs41_check_delegation_stateid(state);
2203 status = nfs41_check_open_stateid(state);
2204 if (status != NFS_OK)
2205 status = nfs4_open_expired(sp, state);
2206 return status;
2207}
2208#endif
2209
2210/*
2211 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2212 * fields corresponding to attributes that were used to store the verifier.
2213 * Make sure we clobber those fields in the later setattr call
2214 */
2215static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2216{
2217 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2218 !(sattr->ia_valid & ATTR_ATIME_SET))
2219 sattr->ia_valid |= ATTR_ATIME;
2220
2221 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2222 !(sattr->ia_valid & ATTR_MTIME_SET))
2223 sattr->ia_valid |= ATTR_MTIME;
2224}
2225
2226static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2227 fmode_t fmode,
2228 int flags,
2229 struct nfs_open_context *ctx)
2230{
2231 struct nfs4_state_owner *sp = opendata->owner;
2232 struct nfs_server *server = sp->so_server;
2233 struct dentry *dentry;
2234 struct nfs4_state *state;
2235 unsigned int seq;
2236 int ret;
2237
2238 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2239
2240 ret = _nfs4_proc_open(opendata);
2241 if (ret != 0)
2242 goto out;
2243
2244 state = nfs4_opendata_to_nfs4_state(opendata);
2245 ret = PTR_ERR(state);
2246 if (IS_ERR(state))
2247 goto out;
2248 if (server->caps & NFS_CAP_POSIX_LOCK)
2249 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2250
2251 dentry = opendata->dentry;
2252 if (dentry->d_inode == NULL) {
2253 /* FIXME: Is this d_drop() ever needed? */
2254 d_drop(dentry);
2255 dentry = d_add_unique(dentry, igrab(state->inode));
2256 if (dentry == NULL) {
2257 dentry = opendata->dentry;
2258 } else if (dentry != ctx->dentry) {
2259 dput(ctx->dentry);
2260 ctx->dentry = dget(dentry);
2261 }
2262 nfs_set_verifier(dentry,
2263 nfs_save_change_attribute(opendata->dir->d_inode));
2264 }
2265
2266 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2267 if (ret != 0)
2268 goto out;
2269
2270 ctx->state = state;
2271 if (dentry->d_inode == state->inode) {
2272 nfs_inode_attach_open_context(ctx);
2273 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2274 nfs4_schedule_stateid_recovery(server, state);
2275 }
2276out:
2277 return ret;
2278}
2279
2280/*
2281 * Returns a referenced nfs4_state
2282 */
2283static int _nfs4_do_open(struct inode *dir,
2284 struct nfs_open_context *ctx,
2285 int flags,
2286 struct iattr *sattr,
2287 struct nfs4_label *label,
2288 int *opened)
2289{
2290 struct nfs4_state_owner *sp;
2291 struct nfs4_state *state = NULL;
2292 struct nfs_server *server = NFS_SERVER(dir);
2293 struct nfs4_opendata *opendata;
2294 struct dentry *dentry = ctx->dentry;
2295 struct rpc_cred *cred = ctx->cred;
2296 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2297 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2298 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2299 struct nfs4_label *olabel = NULL;
2300 int status;
2301
2302 /* Protect against reboot recovery conflicts */
2303 status = -ENOMEM;
2304 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2305 if (sp == NULL) {
2306 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2307 goto out_err;
2308 }
2309 status = nfs4_recover_expired_lease(server);
2310 if (status != 0)
2311 goto err_put_state_owner;
2312 if (dentry->d_inode != NULL)
2313 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2314 status = -ENOMEM;
2315 if (dentry->d_inode)
2316 claim = NFS4_OPEN_CLAIM_FH;
2317 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2318 label, claim, GFP_KERNEL);
2319 if (opendata == NULL)
2320 goto err_put_state_owner;
2321
2322 if (label) {
2323 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2324 if (IS_ERR(olabel)) {
2325 status = PTR_ERR(olabel);
2326 goto err_opendata_put;
2327 }
2328 }
2329
2330 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2331 if (!opendata->f_attr.mdsthreshold) {
2332 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2333 if (!opendata->f_attr.mdsthreshold)
2334 goto err_free_label;
2335 }
2336 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2337 }
2338 if (dentry->d_inode != NULL)
2339 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2340
2341 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2342 if (status != 0)
2343 goto err_free_label;
2344 state = ctx->state;
2345
2346 if ((opendata->o_arg.open_flags & O_EXCL) &&
2347 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2348 nfs4_exclusive_attrset(opendata, sattr);
2349
2350 nfs_fattr_init(opendata->o_res.f_attr);
2351 status = nfs4_do_setattr(state->inode, cred,
2352 opendata->o_res.f_attr, sattr,
2353 state, label, olabel);
2354 if (status == 0) {
2355 nfs_setattr_update_inode(state->inode, sattr);
2356 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2357 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2358 }
2359 }
2360 if (opendata->file_created)
2361 *opened |= FILE_CREATED;
2362
2363 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2364 *ctx_th = opendata->f_attr.mdsthreshold;
2365 opendata->f_attr.mdsthreshold = NULL;
2366 }
2367
2368 nfs4_label_free(olabel);
2369
2370 nfs4_opendata_put(opendata);
2371 nfs4_put_state_owner(sp);
2372 return 0;
2373err_free_label:
2374 nfs4_label_free(olabel);
2375err_opendata_put:
2376 nfs4_opendata_put(opendata);
2377err_put_state_owner:
2378 nfs4_put_state_owner(sp);
2379out_err:
2380 return status;
2381}
2382
2383
2384static struct nfs4_state *nfs4_do_open(struct inode *dir,
2385 struct nfs_open_context *ctx,
2386 int flags,
2387 struct iattr *sattr,
2388 struct nfs4_label *label,
2389 int *opened)
2390{
2391 struct nfs_server *server = NFS_SERVER(dir);
2392 struct nfs4_exception exception = { };
2393 struct nfs4_state *res;
2394 int status;
2395
2396 do {
2397 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2398 res = ctx->state;
2399 trace_nfs4_open_file(ctx, flags, status);
2400 if (status == 0)
2401 break;
2402 /* NOTE: BAD_SEQID means the server and client disagree about the
2403 * book-keeping w.r.t. state-changing operations
2404 * (OPEN/CLOSE/LOCK/LOCKU...)
2405 * It is actually a sign of a bug on the client or on the server.
2406 *
2407 * If we receive a BAD_SEQID error in the particular case of
2408 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2409 * have unhashed the old state_owner for us, and that we can
2410 * therefore safely retry using a new one. We should still warn
2411 * the user though...
2412 */
2413 if (status == -NFS4ERR_BAD_SEQID) {
2414 pr_warn_ratelimited("NFS: v4 server %s "
2415 " returned a bad sequence-id error!\n",
2416 NFS_SERVER(dir)->nfs_client->cl_hostname);
2417 exception.retry = 1;
2418 continue;
2419 }
2420 /*
2421 * BAD_STATEID on OPEN means that the server cancelled our
2422 * state before it received the OPEN_CONFIRM.
2423 * Recover by retrying the request as per the discussion
2424 * on Page 181 of RFC3530.
2425 */
2426 if (status == -NFS4ERR_BAD_STATEID) {
2427 exception.retry = 1;
2428 continue;
2429 }
2430 if (status == -EAGAIN) {
2431 /* We must have found a delegation */
2432 exception.retry = 1;
2433 continue;
2434 }
2435 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2436 continue;
2437 res = ERR_PTR(nfs4_handle_exception(server,
2438 status, &exception));
2439 } while (exception.retry);
2440 return res;
2441}
2442
2443static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2444 struct nfs_fattr *fattr, struct iattr *sattr,
2445 struct nfs4_state *state, struct nfs4_label *ilabel,
2446 struct nfs4_label *olabel)
2447{
2448 struct nfs_server *server = NFS_SERVER(inode);
2449 struct nfs_setattrargs arg = {
2450 .fh = NFS_FH(inode),
2451 .iap = sattr,
2452 .server = server,
2453 .bitmask = server->attr_bitmask,
2454 .label = ilabel,
2455 };
2456 struct nfs_setattrres res = {
2457 .fattr = fattr,
2458 .label = olabel,
2459 .server = server,
2460 };
2461 struct rpc_message msg = {
2462 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2463 .rpc_argp = &arg,
2464 .rpc_resp = &res,
2465 .rpc_cred = cred,
2466 };
2467 unsigned long timestamp = jiffies;
2468 fmode_t fmode;
2469 bool truncate;
2470 int status;
2471
2472 arg.bitmask = nfs4_bitmask(server, ilabel);
2473 if (ilabel)
2474 arg.bitmask = nfs4_bitmask(server, olabel);
2475
2476 nfs_fattr_init(fattr);
2477
2478 /* Servers should only apply open mode checks for file size changes */
2479 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2480 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2481
2482 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2483 /* Use that stateid */
2484 } else if (truncate && state != NULL) {
2485 struct nfs_lockowner lockowner = {
2486 .l_owner = current->files,
2487 .l_pid = current->tgid,
2488 };
2489 if (!nfs4_valid_open_stateid(state))
2490 return -EBADF;
2491 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2492 &lockowner) == -EIO)
2493 return -EBADF;
2494 } else
2495 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2496
2497 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2498 if (status == 0 && state != NULL)
2499 renew_lease(server, timestamp);
2500 return status;
2501}
2502
2503static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2504 struct nfs_fattr *fattr, struct iattr *sattr,
2505 struct nfs4_state *state, struct nfs4_label *ilabel,
2506 struct nfs4_label *olabel)
2507{
2508 struct nfs_server *server = NFS_SERVER(inode);
2509 struct nfs4_exception exception = {
2510 .state = state,
2511 .inode = inode,
2512 };
2513 int err;
2514 do {
2515 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2516 trace_nfs4_setattr(inode, err);
2517 switch (err) {
2518 case -NFS4ERR_OPENMODE:
2519 if (!(sattr->ia_valid & ATTR_SIZE)) {
2520 pr_warn_once("NFSv4: server %s is incorrectly "
2521 "applying open mode checks to "
2522 "a SETATTR that is not "
2523 "changing file size.\n",
2524 server->nfs_client->cl_hostname);
2525 }
2526 if (state && !(state->state & FMODE_WRITE)) {
2527 err = -EBADF;
2528 if (sattr->ia_valid & ATTR_OPEN)
2529 err = -EACCES;
2530 goto out;
2531 }
2532 }
2533 err = nfs4_handle_exception(server, err, &exception);
2534 } while (exception.retry);
2535out:
2536 return err;
2537}
2538
2539struct nfs4_closedata {
2540 struct inode *inode;
2541 struct nfs4_state *state;
2542 struct nfs_closeargs arg;
2543 struct nfs_closeres res;
2544 struct nfs_fattr fattr;
2545 unsigned long timestamp;
2546 bool roc;
2547 u32 roc_barrier;
2548};
2549
2550static void nfs4_free_closedata(void *data)
2551{
2552 struct nfs4_closedata *calldata = data;
2553 struct nfs4_state_owner *sp = calldata->state->owner;
2554 struct super_block *sb = calldata->state->inode->i_sb;
2555
2556 if (calldata->roc)
2557 pnfs_roc_release(calldata->state->inode);
2558 nfs4_put_open_state(calldata->state);
2559 nfs_free_seqid(calldata->arg.seqid);
2560 nfs4_put_state_owner(sp);
2561 nfs_sb_deactive(sb);
2562 kfree(calldata);
2563}
2564
2565static void nfs4_close_done(struct rpc_task *task, void *data)
2566{
2567 struct nfs4_closedata *calldata = data;
2568 struct nfs4_state *state = calldata->state;
2569 struct nfs_server *server = NFS_SERVER(calldata->inode);
2570 nfs4_stateid *res_stateid = NULL;
2571
2572 dprintk("%s: begin!\n", __func__);
2573 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2574 return;
2575 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2576 /* hmm. we are done with the inode, and in the process of freeing
2577 * the state_owner. we keep this around to process errors
2578 */
2579 switch (task->tk_status) {
2580 case 0:
2581 res_stateid = &calldata->res.stateid;
2582 if (calldata->arg.fmode == 0 && calldata->roc)
2583 pnfs_roc_set_barrier(state->inode,
2584 calldata->roc_barrier);
2585 renew_lease(server, calldata->timestamp);
2586 break;
2587 case -NFS4ERR_ADMIN_REVOKED:
2588 case -NFS4ERR_STALE_STATEID:
2589 case -NFS4ERR_OLD_STATEID:
2590 case -NFS4ERR_BAD_STATEID:
2591 case -NFS4ERR_EXPIRED:
2592 if (calldata->arg.fmode == 0)
2593 break;
2594 default:
2595 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2596 rpc_restart_call_prepare(task);
2597 goto out_release;
2598 }
2599 }
2600 nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2601out_release:
2602 nfs_release_seqid(calldata->arg.seqid);
2603 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2604 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2605}
2606
2607static void nfs4_close_prepare(struct rpc_task *task, void *data)
2608{
2609 struct nfs4_closedata *calldata = data;
2610 struct nfs4_state *state = calldata->state;
2611 struct inode *inode = calldata->inode;
2612 bool is_rdonly, is_wronly, is_rdwr;
2613 int call_close = 0;
2614
2615 dprintk("%s: begin!\n", __func__);
2616 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2617 goto out_wait;
2618
2619 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2620 spin_lock(&state->owner->so_lock);
2621 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2622 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2623 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2624 /* Calculate the change in open mode */
2625 calldata->arg.fmode = 0;
2626 if (state->n_rdwr == 0) {
2627 if (state->n_rdonly == 0)
2628 call_close |= is_rdonly;
2629 else if (is_rdonly)
2630 calldata->arg.fmode |= FMODE_READ;
2631 if (state->n_wronly == 0)
2632 call_close |= is_wronly;
2633 else if (is_wronly)
2634 calldata->arg.fmode |= FMODE_WRITE;
2635 } else if (is_rdwr)
2636 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2637
2638 if (calldata->arg.fmode == 0)
2639 call_close |= is_rdwr;
2640
2641 if (!nfs4_valid_open_stateid(state))
2642 call_close = 0;
2643 spin_unlock(&state->owner->so_lock);
2644
2645 if (!call_close) {
2646 /* Note: exit _without_ calling nfs4_close_done */
2647 goto out_no_action;
2648 }
2649
2650 if (calldata->arg.fmode == 0) {
2651 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2652 if (calldata->roc &&
2653 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2654 nfs_release_seqid(calldata->arg.seqid);
2655 goto out_wait;
2656 }
2657 }
2658
2659 nfs_fattr_init(calldata->res.fattr);
2660 calldata->timestamp = jiffies;
2661 if (nfs4_setup_sequence(NFS_SERVER(inode),
2662 &calldata->arg.seq_args,
2663 &calldata->res.seq_res,
2664 task) != 0)
2665 nfs_release_seqid(calldata->arg.seqid);
2666 dprintk("%s: done!\n", __func__);
2667 return;
2668out_no_action:
2669 task->tk_action = NULL;
2670out_wait:
2671 nfs4_sequence_done(task, &calldata->res.seq_res);
2672}
2673
2674static const struct rpc_call_ops nfs4_close_ops = {
2675 .rpc_call_prepare = nfs4_close_prepare,
2676 .rpc_call_done = nfs4_close_done,
2677 .rpc_release = nfs4_free_closedata,
2678};
2679
2680static bool nfs4_state_has_opener(struct nfs4_state *state)
2681{
2682 /* first check existing openers */
2683 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2684 state->n_rdonly != 0)
2685 return true;
2686
2687 if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2688 state->n_wronly != 0)
2689 return true;
2690
2691 if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2692 state->n_rdwr != 0)
2693 return true;
2694
2695 return false;
2696}
2697
2698static bool nfs4_roc(struct inode *inode)
2699{
2700 struct nfs_inode *nfsi = NFS_I(inode);
2701 struct nfs_open_context *ctx;
2702 struct nfs4_state *state;
2703
2704 spin_lock(&inode->i_lock);
2705 list_for_each_entry(ctx, &nfsi->open_files, list) {
2706 state = ctx->state;
2707 if (state == NULL)
2708 continue;
2709 if (nfs4_state_has_opener(state)) {
2710 spin_unlock(&inode->i_lock);
2711 return false;
2712 }
2713 }
2714 spin_unlock(&inode->i_lock);
2715
2716 if (nfs4_check_delegation(inode, FMODE_READ))
2717 return false;
2718
2719 return pnfs_roc(inode);
2720}
2721
2722/*
2723 * It is possible for data to be read/written from a mem-mapped file
2724 * after the sys_close call (which hits the vfs layer as a flush).
2725 * This means that we can't safely call nfsv4 close on a file until
2726 * the inode is cleared. This in turn means that we are not good
2727 * NFSv4 citizens - we do not indicate to the server to update the file's
2728 * share state even when we are done with one of the three share
2729 * stateid's in the inode.
2730 *
2731 * NOTE: Caller must be holding the sp->so_owner semaphore!
2732 */
2733int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2734{
2735 struct nfs_server *server = NFS_SERVER(state->inode);
2736 struct nfs4_closedata *calldata;
2737 struct nfs4_state_owner *sp = state->owner;
2738 struct rpc_task *task;
2739 struct rpc_message msg = {
2740 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2741 .rpc_cred = state->owner->so_cred,
2742 };
2743 struct rpc_task_setup task_setup_data = {
2744 .rpc_client = server->client,
2745 .rpc_message = &msg,
2746 .callback_ops = &nfs4_close_ops,
2747 .workqueue = nfsiod_workqueue,
2748 .flags = RPC_TASK_ASYNC,
2749 };
2750 int status = -ENOMEM;
2751
2752 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2753 &task_setup_data.rpc_client, &msg);
2754
2755 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2756 if (calldata == NULL)
2757 goto out;
2758 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2759 calldata->inode = state->inode;
2760 calldata->state = state;
2761 calldata->arg.fh = NFS_FH(state->inode);
2762 calldata->arg.stateid = &state->open_stateid;
2763 /* Serialization for the sequence id */
2764 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2765 if (calldata->arg.seqid == NULL)
2766 goto out_free_calldata;
2767 calldata->arg.fmode = 0;
2768 calldata->arg.bitmask = server->cache_consistency_bitmask;
2769 calldata->res.fattr = &calldata->fattr;
2770 calldata->res.seqid = calldata->arg.seqid;
2771 calldata->res.server = server;
2772 calldata->roc = nfs4_roc(state->inode);
2773 nfs_sb_active(calldata->inode->i_sb);
2774
2775 msg.rpc_argp = &calldata->arg;
2776 msg.rpc_resp = &calldata->res;
2777 task_setup_data.callback_data = calldata;
2778 task = rpc_run_task(&task_setup_data);
2779 if (IS_ERR(task))
2780 return PTR_ERR(task);
2781 status = 0;
2782 if (wait)
2783 status = rpc_wait_for_completion_task(task);
2784 rpc_put_task(task);
2785 return status;
2786out_free_calldata:
2787 kfree(calldata);
2788out:
2789 nfs4_put_open_state(state);
2790 nfs4_put_state_owner(sp);
2791 return status;
2792}
2793
2794static struct inode *
2795nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2796 int open_flags, struct iattr *attr, int *opened)
2797{
2798 struct nfs4_state *state;
2799 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2800
2801 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2802
2803 /* Protect against concurrent sillydeletes */
2804 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2805
2806 nfs4_label_release_security(label);
2807
2808 if (IS_ERR(state))
2809 return ERR_CAST(state);
2810 return state->inode;
2811}
2812
2813static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2814{
2815 if (ctx->state == NULL)
2816 return;
2817 if (is_sync)
2818 nfs4_close_sync(ctx->state, ctx->mode);
2819 else
2820 nfs4_close_state(ctx->state, ctx->mode);
2821}
2822
2823#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2824#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2825#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2826
2827static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2828{
2829 struct nfs4_server_caps_arg args = {
2830 .fhandle = fhandle,
2831 };
2832 struct nfs4_server_caps_res res = {};
2833 struct rpc_message msg = {
2834 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2835 .rpc_argp = &args,
2836 .rpc_resp = &res,
2837 };
2838 int status;
2839
2840 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2841 if (status == 0) {
2842 /* Sanity check the server answers */
2843 switch (server->nfs_client->cl_minorversion) {
2844 case 0:
2845 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2846 res.attr_bitmask[2] = 0;
2847 break;
2848 case 1:
2849 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2850 break;
2851 case 2:
2852 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2853 }
2854 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2855 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2856 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2857 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2858 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2859 NFS_CAP_CTIME|NFS_CAP_MTIME|
2860 NFS_CAP_SECURITY_LABEL);
2861 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2862 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2863 server->caps |= NFS_CAP_ACLS;
2864 if (res.has_links != 0)
2865 server->caps |= NFS_CAP_HARDLINKS;
2866 if (res.has_symlinks != 0)
2867 server->caps |= NFS_CAP_SYMLINKS;
2868 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2869 server->caps |= NFS_CAP_FILEID;
2870 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2871 server->caps |= NFS_CAP_MODE;
2872 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2873 server->caps |= NFS_CAP_NLINK;
2874 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2875 server->caps |= NFS_CAP_OWNER;
2876 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2877 server->caps |= NFS_CAP_OWNER_GROUP;
2878 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2879 server->caps |= NFS_CAP_ATIME;
2880 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2881 server->caps |= NFS_CAP_CTIME;
2882 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2883 server->caps |= NFS_CAP_MTIME;
2884#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2885 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2886 server->caps |= NFS_CAP_SECURITY_LABEL;
2887#endif
2888 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2889 sizeof(server->attr_bitmask));
2890 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2891
2892 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2893 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2894 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2895 server->cache_consistency_bitmask[2] = 0;
2896 server->acl_bitmask = res.acl_bitmask;
2897 server->fh_expire_type = res.fh_expire_type;
2898 }
2899
2900 return status;
2901}
2902
2903int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2904{
2905 struct nfs4_exception exception = { };
2906 int err;
2907 do {
2908 err = nfs4_handle_exception(server,
2909 _nfs4_server_capabilities(server, fhandle),
2910 &exception);
2911 } while (exception.retry);
2912 return err;
2913}
2914
2915static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2916 struct nfs_fsinfo *info)
2917{
2918 u32 bitmask[3];
2919 struct nfs4_lookup_root_arg args = {
2920 .bitmask = bitmask,
2921 };
2922 struct nfs4_lookup_res res = {
2923 .server = server,
2924 .fattr = info->fattr,
2925 .fh = fhandle,
2926 };
2927 struct rpc_message msg = {
2928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2929 .rpc_argp = &args,
2930 .rpc_resp = &res,
2931 };
2932
2933 bitmask[0] = nfs4_fattr_bitmap[0];
2934 bitmask[1] = nfs4_fattr_bitmap[1];
2935 /*
2936 * Process the label in the upcoming getfattr
2937 */
2938 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2939
2940 nfs_fattr_init(info->fattr);
2941 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2942}
2943
2944static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2945 struct nfs_fsinfo *info)
2946{
2947 struct nfs4_exception exception = { };
2948 int err;
2949 do {
2950 err = _nfs4_lookup_root(server, fhandle, info);
2951 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2952 switch (err) {
2953 case 0:
2954 case -NFS4ERR_WRONGSEC:
2955 goto out;
2956 default:
2957 err = nfs4_handle_exception(server, err, &exception);
2958 }
2959 } while (exception.retry);
2960out:
2961 return err;
2962}
2963
2964static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2965 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2966{
2967 struct rpc_auth_create_args auth_args = {
2968 .pseudoflavor = flavor,
2969 };
2970 struct rpc_auth *auth;
2971 int ret;
2972
2973 auth = rpcauth_create(&auth_args, server->client);
2974 if (IS_ERR(auth)) {
2975 ret = -EACCES;
2976 goto out;
2977 }
2978 ret = nfs4_lookup_root(server, fhandle, info);
2979out:
2980 return ret;
2981}
2982
2983/*
2984 * Retry pseudoroot lookup with various security flavors. We do this when:
2985 *
2986 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2987 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2988 *
2989 * Returns zero on success, or a negative NFS4ERR value, or a
2990 * negative errno value.
2991 */
2992static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2993 struct nfs_fsinfo *info)
2994{
2995 /* Per 3530bis 15.33.5 */
2996 static const rpc_authflavor_t flav_array[] = {
2997 RPC_AUTH_GSS_KRB5P,
2998 RPC_AUTH_GSS_KRB5I,
2999 RPC_AUTH_GSS_KRB5,
3000 RPC_AUTH_UNIX, /* courtesy */
3001 RPC_AUTH_NULL,
3002 };
3003 int status = -EPERM;
3004 size_t i;
3005
3006 if (server->auth_info.flavor_len > 0) {
3007 /* try each flavor specified by user */
3008 for (i = 0; i < server->auth_info.flavor_len; i++) {
3009 status = nfs4_lookup_root_sec(server, fhandle, info,
3010 server->auth_info.flavors[i]);
3011 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3012 continue;
3013 break;
3014 }
3015 } else {
3016 /* no flavors specified by user, try default list */
3017 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3018 status = nfs4_lookup_root_sec(server, fhandle, info,
3019 flav_array[i]);
3020 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3021 continue;
3022 break;
3023 }
3024 }
3025
3026 /*
3027 * -EACCESS could mean that the user doesn't have correct permissions
3028 * to access the mount. It could also mean that we tried to mount
3029 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3030 * existing mount programs don't handle -EACCES very well so it should
3031 * be mapped to -EPERM instead.
3032 */
3033 if (status == -EACCES)
3034 status = -EPERM;
3035 return status;
3036}
3037
3038static int nfs4_do_find_root_sec(struct nfs_server *server,
3039 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3040{
3041 int mv = server->nfs_client->cl_minorversion;
3042 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3043}
3044
3045/**
3046 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3047 * @server: initialized nfs_server handle
3048 * @fhandle: we fill in the pseudo-fs root file handle
3049 * @info: we fill in an FSINFO struct
3050 * @auth_probe: probe the auth flavours
3051 *
3052 * Returns zero on success, or a negative errno.
3053 */
3054int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3055 struct nfs_fsinfo *info,
3056 bool auth_probe)
3057{
3058 int status;
3059
3060 switch (auth_probe) {
3061 case false:
3062 status = nfs4_lookup_root(server, fhandle, info);
3063 if (status != -NFS4ERR_WRONGSEC)
3064 break;
3065 default:
3066 status = nfs4_do_find_root_sec(server, fhandle, info);
3067 }
3068
3069 if (status == 0)
3070 status = nfs4_server_capabilities(server, fhandle);
3071 if (status == 0)
3072 status = nfs4_do_fsinfo(server, fhandle, info);
3073
3074 return nfs4_map_errors(status);
3075}
3076
3077static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3078 struct nfs_fsinfo *info)
3079{
3080 int error;
3081 struct nfs_fattr *fattr = info->fattr;
3082 struct nfs4_label *label = NULL;
3083
3084 error = nfs4_server_capabilities(server, mntfh);
3085 if (error < 0) {
3086 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3087 return error;
3088 }
3089
3090 label = nfs4_label_alloc(server, GFP_KERNEL);
3091 if (IS_ERR(label))
3092 return PTR_ERR(label);
3093
3094 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3095 if (error < 0) {
3096 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3097 goto err_free_label;
3098 }
3099
3100 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3101 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3102 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3103
3104err_free_label:
3105 nfs4_label_free(label);
3106
3107 return error;
3108}
3109
3110/*
3111 * Get locations and (maybe) other attributes of a referral.
3112 * Note that we'll actually follow the referral later when
3113 * we detect fsid mismatch in inode revalidation
3114 */
3115static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3116 const struct qstr *name, struct nfs_fattr *fattr,
3117 struct nfs_fh *fhandle)
3118{
3119 int status = -ENOMEM;
3120 struct page *page = NULL;
3121 struct nfs4_fs_locations *locations = NULL;
3122
3123 page = alloc_page(GFP_KERNEL);
3124 if (page == NULL)
3125 goto out;
3126 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3127 if (locations == NULL)
3128 goto out;
3129
3130 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3131 if (status != 0)
3132 goto out;
3133
3134 /*
3135 * If the fsid didn't change, this is a migration event, not a
3136 * referral. Cause us to drop into the exception handler, which
3137 * will kick off migration recovery.
3138 */
3139 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3140 dprintk("%s: server did not return a different fsid for"
3141 " a referral at %s\n", __func__, name->name);
3142 status = -NFS4ERR_MOVED;
3143 goto out;
3144 }
3145 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3146 nfs_fixup_referral_attributes(&locations->fattr);
3147
3148 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3149 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3150 memset(fhandle, 0, sizeof(struct nfs_fh));
3151out:
3152 if (page)
3153 __free_page(page);
3154 kfree(locations);
3155 return status;
3156}
3157
3158static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3159 struct nfs_fattr *fattr, struct nfs4_label *label)
3160{
3161 struct nfs4_getattr_arg args = {
3162 .fh = fhandle,
3163 .bitmask = server->attr_bitmask,
3164 };
3165 struct nfs4_getattr_res res = {
3166 .fattr = fattr,
3167 .label = label,
3168 .server = server,
3169 };
3170 struct rpc_message msg = {
3171 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3172 .rpc_argp = &args,
3173 .rpc_resp = &res,
3174 };
3175
3176 args.bitmask = nfs4_bitmask(server, label);
3177
3178 nfs_fattr_init(fattr);
3179 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3180}
3181
3182static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3183 struct nfs_fattr *fattr, struct nfs4_label *label)
3184{
3185 struct nfs4_exception exception = { };
3186 int err;
3187 do {
3188 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3189 trace_nfs4_getattr(server, fhandle, fattr, err);
3190 err = nfs4_handle_exception(server, err,
3191 &exception);
3192 } while (exception.retry);
3193 return err;
3194}
3195
3196/*
3197 * The file is not closed if it is opened due to the a request to change
3198 * the size of the file. The open call will not be needed once the
3199 * VFS layer lookup-intents are implemented.
3200 *
3201 * Close is called when the inode is destroyed.
3202 * If we haven't opened the file for O_WRONLY, we
3203 * need to in the size_change case to obtain a stateid.
3204 *
3205 * Got race?
3206 * Because OPEN is always done by name in nfsv4, it is
3207 * possible that we opened a different file by the same
3208 * name. We can recognize this race condition, but we
3209 * can't do anything about it besides returning an error.
3210 *
3211 * This will be fixed with VFS changes (lookup-intent).
3212 */
3213static int
3214nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3215 struct iattr *sattr)
3216{
3217 struct inode *inode = dentry->d_inode;
3218 struct rpc_cred *cred = NULL;
3219 struct nfs4_state *state = NULL;
3220 struct nfs4_label *label = NULL;
3221 int status;
3222
3223 if (pnfs_ld_layoutret_on_setattr(inode) &&
3224 sattr->ia_valid & ATTR_SIZE &&
3225 sattr->ia_size < i_size_read(inode))
3226 pnfs_commit_and_return_layout(inode);
3227
3228 nfs_fattr_init(fattr);
3229
3230 /* Deal with open(O_TRUNC) */
3231 if (sattr->ia_valid & ATTR_OPEN)
3232 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3233
3234 /* Optimization: if the end result is no change, don't RPC */
3235 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3236 return 0;
3237
3238 /* Search for an existing open(O_WRITE) file */
3239 if (sattr->ia_valid & ATTR_FILE) {
3240 struct nfs_open_context *ctx;
3241
3242 ctx = nfs_file_open_context(sattr->ia_file);
3243 if (ctx) {
3244 cred = ctx->cred;
3245 state = ctx->state;
3246 }
3247 }
3248
3249 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3250 if (IS_ERR(label))
3251 return PTR_ERR(label);
3252
3253 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3254 if (status == 0) {
3255 nfs_setattr_update_inode(inode, sattr);
3256 nfs_setsecurity(inode, fattr, label);
3257 }
3258 nfs4_label_free(label);
3259 return status;
3260}
3261
3262static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3263 const struct qstr *name, struct nfs_fh *fhandle,
3264 struct nfs_fattr *fattr, struct nfs4_label *label)
3265{
3266 struct nfs_server *server = NFS_SERVER(dir);
3267 int status;
3268 struct nfs4_lookup_arg args = {
3269 .bitmask = server->attr_bitmask,
3270 .dir_fh = NFS_FH(dir),
3271 .name = name,
3272 };
3273 struct nfs4_lookup_res res = {
3274 .server = server,
3275 .fattr = fattr,
3276 .label = label,
3277 .fh = fhandle,
3278 };
3279 struct rpc_message msg = {
3280 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3281 .rpc_argp = &args,
3282 .rpc_resp = &res,
3283 };
3284
3285 args.bitmask = nfs4_bitmask(server, label);
3286
3287 nfs_fattr_init(fattr);
3288
3289 dprintk("NFS call lookup %s\n", name->name);
3290 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3291 dprintk("NFS reply lookup: %d\n", status);
3292 return status;
3293}
3294
3295static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3296{
3297 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3298 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3299 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3300 fattr->nlink = 2;
3301}
3302
3303static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3304 struct qstr *name, struct nfs_fh *fhandle,
3305 struct nfs_fattr *fattr, struct nfs4_label *label)
3306{
3307 struct nfs4_exception exception = { };
3308 struct rpc_clnt *client = *clnt;
3309 int err;
3310 do {
3311 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3312 trace_nfs4_lookup(dir, name, err);
3313 switch (err) {
3314 case -NFS4ERR_BADNAME:
3315 err = -ENOENT;
3316 goto out;
3317 case -NFS4ERR_MOVED:
3318 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3319 goto out;
3320 case -NFS4ERR_WRONGSEC:
3321 err = -EPERM;
3322 if (client != *clnt)
3323 goto out;
3324 client = nfs4_negotiate_security(client, dir, name);
3325 if (IS_ERR(client))
3326 return PTR_ERR(client);
3327
3328 exception.retry = 1;
3329 break;
3330 default:
3331 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3332 }
3333 } while (exception.retry);
3334
3335out:
3336 if (err == 0)
3337 *clnt = client;
3338 else if (client != *clnt)
3339 rpc_shutdown_client(client);
3340
3341 return err;
3342}
3343
3344static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3345 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3346 struct nfs4_label *label)
3347{
3348 int status;
3349 struct rpc_clnt *client = NFS_CLIENT(dir);
3350
3351 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3352 if (client != NFS_CLIENT(dir)) {
3353 rpc_shutdown_client(client);
3354 nfs_fixup_secinfo_attributes(fattr);
3355 }
3356 return status;
3357}
3358
3359struct rpc_clnt *
3360nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3361 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3362{
3363 struct rpc_clnt *client = NFS_CLIENT(dir);
3364 int status;
3365
3366 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3367 if (status < 0)
3368 return ERR_PTR(status);
3369 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3370}
3371
3372static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3373{
3374 struct nfs_server *server = NFS_SERVER(inode);
3375 struct nfs4_accessargs args = {
3376 .fh = NFS_FH(inode),
3377 .bitmask = server->cache_consistency_bitmask,
3378 };
3379 struct nfs4_accessres res = {
3380 .server = server,
3381 };
3382 struct rpc_message msg = {
3383 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3384 .rpc_argp = &args,
3385 .rpc_resp = &res,
3386 .rpc_cred = entry->cred,
3387 };
3388 int mode = entry->mask;
3389 int status = 0;
3390
3391 /*
3392 * Determine which access bits we want to ask for...
3393 */
3394 if (mode & MAY_READ)
3395 args.access |= NFS4_ACCESS_READ;
3396 if (S_ISDIR(inode->i_mode)) {
3397 if (mode & MAY_WRITE)
3398 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3399 if (mode & MAY_EXEC)
3400 args.access |= NFS4_ACCESS_LOOKUP;
3401 } else {
3402 if (mode & MAY_WRITE)
3403 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3404 if (mode & MAY_EXEC)
3405 args.access |= NFS4_ACCESS_EXECUTE;
3406 }
3407
3408 res.fattr = nfs_alloc_fattr();
3409 if (res.fattr == NULL)
3410 return -ENOMEM;
3411
3412 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3413 if (!status) {
3414 nfs_access_set_mask(entry, res.access);
3415 nfs_refresh_inode(inode, res.fattr);
3416 }
3417 nfs_free_fattr(res.fattr);
3418 return status;
3419}
3420
3421static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3422{
3423 struct nfs4_exception exception = { };
3424 int err;
3425 do {
3426 err = _nfs4_proc_access(inode, entry);
3427 trace_nfs4_access(inode, err);
3428 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3429 &exception);
3430 } while (exception.retry);
3431 return err;
3432}
3433
3434/*
3435 * TODO: For the time being, we don't try to get any attributes
3436 * along with any of the zero-copy operations READ, READDIR,
3437 * READLINK, WRITE.
3438 *
3439 * In the case of the first three, we want to put the GETATTR
3440 * after the read-type operation -- this is because it is hard
3441 * to predict the length of a GETATTR response in v4, and thus
3442 * align the READ data correctly. This means that the GETATTR
3443 * may end up partially falling into the page cache, and we should
3444 * shift it into the 'tail' of the xdr_buf before processing.
3445 * To do this efficiently, we need to know the total length
3446 * of data received, which doesn't seem to be available outside
3447 * of the RPC layer.
3448 *
3449 * In the case of WRITE, we also want to put the GETATTR after
3450 * the operation -- in this case because we want to make sure
3451 * we get the post-operation mtime and size.
3452 *
3453 * Both of these changes to the XDR layer would in fact be quite
3454 * minor, but I decided to leave them for a subsequent patch.
3455 */
3456static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3457 unsigned int pgbase, unsigned int pglen)
3458{
3459 struct nfs4_readlink args = {
3460 .fh = NFS_FH(inode),
3461 .pgbase = pgbase,
3462 .pglen = pglen,
3463 .pages = &page,
3464 };
3465 struct nfs4_readlink_res res;
3466 struct rpc_message msg = {
3467 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3468 .rpc_argp = &args,
3469 .rpc_resp = &res,
3470 };
3471
3472 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3473}
3474
3475static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3476 unsigned int pgbase, unsigned int pglen)
3477{
3478 struct nfs4_exception exception = { };
3479 int err;
3480 do {
3481 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3482 trace_nfs4_readlink(inode, err);
3483 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3484 &exception);
3485 } while (exception.retry);
3486 return err;
3487}
3488
3489/*
3490 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3491 */
3492static int
3493nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3494 int flags)
3495{
3496 struct nfs4_label l, *ilabel = NULL;
3497 struct nfs_open_context *ctx;
3498 struct nfs4_state *state;
3499 int opened = 0;
3500 int status = 0;
3501
3502 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3503 if (IS_ERR(ctx))
3504 return PTR_ERR(ctx);
3505
3506 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3507
3508 sattr->ia_mode &= ~current_umask();
3509 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3510 if (IS_ERR(state)) {
3511 status = PTR_ERR(state);
3512 goto out;
3513 }
3514out:
3515 nfs4_label_release_security(ilabel);
3516 put_nfs_open_context(ctx);
3517 return status;
3518}
3519
3520static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3521{
3522 struct nfs_server *server = NFS_SERVER(dir);
3523 struct nfs_removeargs args = {
3524 .fh = NFS_FH(dir),
3525 .name = *name,
3526 };
3527 struct nfs_removeres res = {
3528 .server = server,
3529 };
3530 struct rpc_message msg = {
3531 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3532 .rpc_argp = &args,
3533 .rpc_resp = &res,
3534 };
3535 int status;
3536
3537 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3538 if (status == 0)
3539 update_changeattr(dir, &res.cinfo);
3540 return status;
3541}
3542
3543static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3544{
3545 struct nfs4_exception exception = { };
3546 int err;
3547 do {
3548 err = _nfs4_proc_remove(dir, name);
3549 trace_nfs4_remove(dir, name, err);
3550 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3551 &exception);
3552 } while (exception.retry);
3553 return err;
3554}
3555
3556static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3557{
3558 struct nfs_server *server = NFS_SERVER(dir);
3559 struct nfs_removeargs *args = msg->rpc_argp;
3560 struct nfs_removeres *res = msg->rpc_resp;
3561
3562 res->server = server;
3563 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3564 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3565
3566 nfs_fattr_init(res->dir_attr);
3567}
3568
3569static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3570{
3571 nfs4_setup_sequence(NFS_SERVER(data->dir),
3572 &data->args.seq_args,
3573 &data->res.seq_res,
3574 task);
3575}
3576
3577static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3578{
3579 struct nfs_unlinkdata *data = task->tk_calldata;
3580 struct nfs_removeres *res = &data->res;
3581
3582 if (!nfs4_sequence_done(task, &res->seq_res))
3583 return 0;
3584 if (nfs4_async_handle_error(task, res->server, NULL,
3585 &data->timeout) == -EAGAIN)
3586 return 0;
3587 update_changeattr(dir, &res->cinfo);
3588 return 1;
3589}
3590
3591static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3592{
3593 struct nfs_server *server = NFS_SERVER(dir);
3594 struct nfs_renameargs *arg = msg->rpc_argp;
3595 struct nfs_renameres *res = msg->rpc_resp;
3596
3597 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3598 res->server = server;
3599 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3600}
3601
3602static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3603{
3604 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3605 &data->args.seq_args,
3606 &data->res.seq_res,
3607 task);
3608}
3609
3610static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3611 struct inode *new_dir)
3612{
3613 struct nfs_renamedata *data = task->tk_calldata;
3614 struct nfs_renameres *res = &data->res;
3615
3616 if (!nfs4_sequence_done(task, &res->seq_res))
3617 return 0;
3618 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3619 return 0;
3620
3621 update_changeattr(old_dir, &res->old_cinfo);
3622 update_changeattr(new_dir, &res->new_cinfo);
3623 return 1;
3624}
3625
3626static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3627{
3628 struct nfs_server *server = NFS_SERVER(inode);
3629 struct nfs4_link_arg arg = {
3630 .fh = NFS_FH(inode),
3631 .dir_fh = NFS_FH(dir),
3632 .name = name,
3633 .bitmask = server->attr_bitmask,
3634 };
3635 struct nfs4_link_res res = {
3636 .server = server,
3637 .label = NULL,
3638 };
3639 struct rpc_message msg = {
3640 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3641 .rpc_argp = &arg,
3642 .rpc_resp = &res,
3643 };
3644 int status = -ENOMEM;
3645
3646 res.fattr = nfs_alloc_fattr();
3647 if (res.fattr == NULL)
3648 goto out;
3649
3650 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3651 if (IS_ERR(res.label)) {
3652 status = PTR_ERR(res.label);
3653 goto out;
3654 }
3655 arg.bitmask = nfs4_bitmask(server, res.label);
3656
3657 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3658 if (!status) {
3659 update_changeattr(dir, &res.cinfo);
3660 status = nfs_post_op_update_inode(inode, res.fattr);
3661 if (!status)
3662 nfs_setsecurity(inode, res.fattr, res.label);
3663 }
3664
3665
3666 nfs4_label_free(res.label);
3667
3668out:
3669 nfs_free_fattr(res.fattr);
3670 return status;
3671}
3672
3673static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3674{
3675 struct nfs4_exception exception = { };
3676 int err;
3677 do {
3678 err = nfs4_handle_exception(NFS_SERVER(inode),
3679 _nfs4_proc_link(inode, dir, name),
3680 &exception);
3681 } while (exception.retry);
3682 return err;
3683}
3684
3685struct nfs4_createdata {
3686 struct rpc_message msg;
3687 struct nfs4_create_arg arg;
3688 struct nfs4_create_res res;
3689 struct nfs_fh fh;
3690 struct nfs_fattr fattr;
3691 struct nfs4_label *label;
3692};
3693
3694static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3695 struct qstr *name, struct iattr *sattr, u32 ftype)
3696{
3697 struct nfs4_createdata *data;
3698
3699 data = kzalloc(sizeof(*data), GFP_KERNEL);
3700 if (data != NULL) {
3701 struct nfs_server *server = NFS_SERVER(dir);
3702
3703 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3704 if (IS_ERR(data->label))
3705 goto out_free;
3706
3707 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3708 data->msg.rpc_argp = &data->arg;
3709 data->msg.rpc_resp = &data->res;
3710 data->arg.dir_fh = NFS_FH(dir);
3711 data->arg.server = server;
3712 data->arg.name = name;
3713 data->arg.attrs = sattr;
3714 data->arg.ftype = ftype;
3715 data->arg.bitmask = nfs4_bitmask(server, data->label);
3716 data->res.server = server;
3717 data->res.fh = &data->fh;
3718 data->res.fattr = &data->fattr;
3719 data->res.label = data->label;
3720 nfs_fattr_init(data->res.fattr);
3721 }
3722 return data;
3723out_free:
3724 kfree(data);
3725 return NULL;
3726}
3727
3728static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3729{
3730 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3731 &data->arg.seq_args, &data->res.seq_res, 1);
3732 if (status == 0) {
3733 update_changeattr(dir, &data->res.dir_cinfo);
3734 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3735 }
3736 return status;
3737}
3738
3739static void nfs4_free_createdata(struct nfs4_createdata *data)
3740{
3741 nfs4_label_free(data->label);
3742 kfree(data);
3743}
3744
3745static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3746 struct page *page, unsigned int len, struct iattr *sattr,
3747 struct nfs4_label *label)
3748{
3749 struct nfs4_createdata *data;
3750 int status = -ENAMETOOLONG;
3751
3752 if (len > NFS4_MAXPATHLEN)
3753 goto out;
3754
3755 status = -ENOMEM;
3756 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3757 if (data == NULL)
3758 goto out;
3759
3760 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3761 data->arg.u.symlink.pages = &page;
3762 data->arg.u.symlink.len = len;
3763 data->arg.label = label;
3764
3765 status = nfs4_do_create(dir, dentry, data);
3766
3767 nfs4_free_createdata(data);
3768out:
3769 return status;
3770}
3771
3772static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3773 struct page *page, unsigned int len, struct iattr *sattr)
3774{
3775 struct nfs4_exception exception = { };
3776 struct nfs4_label l, *label = NULL;
3777 int err;
3778
3779 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3780
3781 do {
3782 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3783 trace_nfs4_symlink(dir, &dentry->d_name, err);
3784 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3785 &exception);
3786 } while (exception.retry);
3787
3788 nfs4_label_release_security(label);
3789 return err;
3790}
3791
3792static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3793 struct iattr *sattr, struct nfs4_label *label)
3794{
3795 struct nfs4_createdata *data;
3796 int status = -ENOMEM;
3797
3798 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3799 if (data == NULL)
3800 goto out;
3801
3802 data->arg.label = label;
3803 status = nfs4_do_create(dir, dentry, data);
3804
3805 nfs4_free_createdata(data);
3806out:
3807 return status;
3808}
3809
3810static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3811 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 sattr->ia_mode &= ~current_umask();
3820 do {
3821 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3822 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3823 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3824 &exception);
3825 } while (exception.retry);
3826 nfs4_label_release_security(label);
3827
3828 return err;
3829}
3830
3831static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3832 u64 cookie, struct page **pages, unsigned int count, int plus)
3833{
3834 struct inode *dir = dentry->d_inode;
3835 struct nfs4_readdir_arg args = {
3836 .fh = NFS_FH(dir),
3837 .pages = pages,
3838 .pgbase = 0,
3839 .count = count,
3840 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3841 .plus = plus,
3842 };
3843 struct nfs4_readdir_res res;
3844 struct rpc_message msg = {
3845 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3846 .rpc_argp = &args,
3847 .rpc_resp = &res,
3848 .rpc_cred = cred,
3849 };
3850 int status;
3851
3852 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3853 dentry,
3854 (unsigned long long)cookie);
3855 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3856 res.pgbase = args.pgbase;
3857 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3858 if (status >= 0) {
3859 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3860 status += args.pgbase;
3861 }
3862
3863 nfs_invalidate_atime(dir);
3864
3865 dprintk("%s: returns %d\n", __func__, status);
3866 return status;
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 nfs4_exception exception = { };
3873 int err;
3874 do {
3875 err = _nfs4_proc_readdir(dentry, cred, cookie,
3876 pages, count, plus);
3877 trace_nfs4_readdir(dentry->d_inode, err);
3878 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3879 &exception);
3880 } while (exception.retry);
3881 return err;
3882}
3883
3884static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3885 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3886{
3887 struct nfs4_createdata *data;
3888 int mode = sattr->ia_mode;
3889 int status = -ENOMEM;
3890
3891 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3892 if (data == NULL)
3893 goto out;
3894
3895 if (S_ISFIFO(mode))
3896 data->arg.ftype = NF4FIFO;
3897 else if (S_ISBLK(mode)) {
3898 data->arg.ftype = NF4BLK;
3899 data->arg.u.device.specdata1 = MAJOR(rdev);
3900 data->arg.u.device.specdata2 = MINOR(rdev);
3901 }
3902 else if (S_ISCHR(mode)) {
3903 data->arg.ftype = NF4CHR;
3904 data->arg.u.device.specdata1 = MAJOR(rdev);
3905 data->arg.u.device.specdata2 = MINOR(rdev);
3906 } else if (!S_ISSOCK(mode)) {
3907 status = -EINVAL;
3908 goto out_free;
3909 }
3910
3911 data->arg.label = label;
3912 status = nfs4_do_create(dir, dentry, data);
3913out_free:
3914 nfs4_free_createdata(data);
3915out:
3916 return status;
3917}
3918
3919static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3920 struct iattr *sattr, dev_t rdev)
3921{
3922 struct nfs4_exception exception = { };
3923 struct nfs4_label l, *label = NULL;
3924 int err;
3925
3926 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3927
3928 sattr->ia_mode &= ~current_umask();
3929 do {
3930 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3931 trace_nfs4_mknod(dir, &dentry->d_name, err);
3932 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3933 &exception);
3934 } while (exception.retry);
3935
3936 nfs4_label_release_security(label);
3937
3938 return err;
3939}
3940
3941static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3942 struct nfs_fsstat *fsstat)
3943{
3944 struct nfs4_statfs_arg args = {
3945 .fh = fhandle,
3946 .bitmask = server->attr_bitmask,
3947 };
3948 struct nfs4_statfs_res res = {
3949 .fsstat = fsstat,
3950 };
3951 struct rpc_message msg = {
3952 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3953 .rpc_argp = &args,
3954 .rpc_resp = &res,
3955 };
3956
3957 nfs_fattr_init(fsstat->fattr);
3958 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3959}
3960
3961static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3962{
3963 struct nfs4_exception exception = { };
3964 int err;
3965 do {
3966 err = nfs4_handle_exception(server,
3967 _nfs4_proc_statfs(server, fhandle, fsstat),
3968 &exception);
3969 } while (exception.retry);
3970 return err;
3971}
3972
3973static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3974 struct nfs_fsinfo *fsinfo)
3975{
3976 struct nfs4_fsinfo_arg args = {
3977 .fh = fhandle,
3978 .bitmask = server->attr_bitmask,
3979 };
3980 struct nfs4_fsinfo_res res = {
3981 .fsinfo = fsinfo,
3982 };
3983 struct rpc_message msg = {
3984 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3985 .rpc_argp = &args,
3986 .rpc_resp = &res,
3987 };
3988
3989 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3990}
3991
3992static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3993{
3994 struct nfs4_exception exception = { };
3995 unsigned long now = jiffies;
3996 int err;
3997
3998 do {
3999 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4000 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4001 if (err == 0) {
4002 struct nfs_client *clp = server->nfs_client;
4003
4004 spin_lock(&clp->cl_lock);
4005 clp->cl_lease_time = fsinfo->lease_time * HZ;
4006 clp->cl_last_renewal = now;
4007 spin_unlock(&clp->cl_lock);
4008 break;
4009 }
4010 err = nfs4_handle_exception(server, err, &exception);
4011 } while (exception.retry);
4012 return err;
4013}
4014
4015static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4016{
4017 int error;
4018
4019 nfs_fattr_init(fsinfo->fattr);
4020 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4021 if (error == 0) {
4022 /* block layout checks this! */
4023 server->pnfs_blksize = fsinfo->blksize;
4024 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4025 }
4026
4027 return error;
4028}
4029
4030static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4031 struct nfs_pathconf *pathconf)
4032{
4033 struct nfs4_pathconf_arg args = {
4034 .fh = fhandle,
4035 .bitmask = server->attr_bitmask,
4036 };
4037 struct nfs4_pathconf_res res = {
4038 .pathconf = pathconf,
4039 };
4040 struct rpc_message msg = {
4041 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4042 .rpc_argp = &args,
4043 .rpc_resp = &res,
4044 };
4045
4046 /* None of the pathconf attributes are mandatory to implement */
4047 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4048 memset(pathconf, 0, sizeof(*pathconf));
4049 return 0;
4050 }
4051
4052 nfs_fattr_init(pathconf->fattr);
4053 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4054}
4055
4056static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4057 struct nfs_pathconf *pathconf)
4058{
4059 struct nfs4_exception exception = { };
4060 int err;
4061
4062 do {
4063 err = nfs4_handle_exception(server,
4064 _nfs4_proc_pathconf(server, fhandle, pathconf),
4065 &exception);
4066 } while (exception.retry);
4067 return err;
4068}
4069
4070int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4071 const struct nfs_open_context *ctx,
4072 const struct nfs_lock_context *l_ctx,
4073 fmode_t fmode)
4074{
4075 const struct nfs_lockowner *lockowner = NULL;
4076
4077 if (l_ctx != NULL)
4078 lockowner = &l_ctx->lockowner;
4079 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4080}
4081EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4082
4083static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4084 const struct nfs_open_context *ctx,
4085 const struct nfs_lock_context *l_ctx,
4086 fmode_t fmode)
4087{
4088 nfs4_stateid current_stateid;
4089
4090 /* If the current stateid represents a lost lock, then exit */
4091 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4092 return true;
4093 return nfs4_stateid_match(stateid, &current_stateid);
4094}
4095
4096static bool nfs4_error_stateid_expired(int err)
4097{
4098 switch (err) {
4099 case -NFS4ERR_DELEG_REVOKED:
4100 case -NFS4ERR_ADMIN_REVOKED:
4101 case -NFS4ERR_BAD_STATEID:
4102 case -NFS4ERR_STALE_STATEID:
4103 case -NFS4ERR_OLD_STATEID:
4104 case -NFS4ERR_OPENMODE:
4105 case -NFS4ERR_EXPIRED:
4106 return true;
4107 }
4108 return false;
4109}
4110
4111void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4112{
4113 nfs_invalidate_atime(hdr->inode);
4114}
4115
4116static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4117{
4118 struct nfs_server *server = NFS_SERVER(hdr->inode);
4119
4120 trace_nfs4_read(hdr, task->tk_status);
4121 if (nfs4_async_handle_error(task, server,
4122 hdr->args.context->state,
4123 NULL) == -EAGAIN) {
4124 rpc_restart_call_prepare(task);
4125 return -EAGAIN;
4126 }
4127
4128 __nfs4_read_done_cb(hdr);
4129 if (task->tk_status > 0)
4130 renew_lease(server, hdr->timestamp);
4131 return 0;
4132}
4133
4134static bool nfs4_read_stateid_changed(struct rpc_task *task,
4135 struct nfs_pgio_args *args)
4136{
4137
4138 if (!nfs4_error_stateid_expired(task->tk_status) ||
4139 nfs4_stateid_is_current(&args->stateid,
4140 args->context,
4141 args->lock_context,
4142 FMODE_READ))
4143 return false;
4144 rpc_restart_call_prepare(task);
4145 return true;
4146}
4147
4148static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4149{
4150
4151 dprintk("--> %s\n", __func__);
4152
4153 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4154 return -EAGAIN;
4155 if (nfs4_read_stateid_changed(task, &hdr->args))
4156 return -EAGAIN;
4157 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4158 nfs4_read_done_cb(task, hdr);
4159}
4160
4161static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4162 struct rpc_message *msg)
4163{
4164 hdr->timestamp = jiffies;
4165 hdr->pgio_done_cb = nfs4_read_done_cb;
4166 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4167 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4168}
4169
4170static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4171 struct nfs_pgio_header *hdr)
4172{
4173 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4174 &hdr->args.seq_args,
4175 &hdr->res.seq_res,
4176 task))
4177 return 0;
4178 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4179 hdr->args.lock_context,
4180 hdr->rw_ops->rw_mode) == -EIO)
4181 return -EIO;
4182 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4183 return -EIO;
4184 return 0;
4185}
4186
4187static int nfs4_write_done_cb(struct rpc_task *task,
4188 struct nfs_pgio_header *hdr)
4189{
4190 struct inode *inode = hdr->inode;
4191
4192 trace_nfs4_write(hdr, task->tk_status);
4193 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4194 hdr->args.context->state,
4195 NULL) == -EAGAIN) {
4196 rpc_restart_call_prepare(task);
4197 return -EAGAIN;
4198 }
4199 if (task->tk_status >= 0) {
4200 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4201 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4202 }
4203 return 0;
4204}
4205
4206static bool nfs4_write_stateid_changed(struct rpc_task *task,
4207 struct nfs_pgio_args *args)
4208{
4209
4210 if (!nfs4_error_stateid_expired(task->tk_status) ||
4211 nfs4_stateid_is_current(&args->stateid,
4212 args->context,
4213 args->lock_context,
4214 FMODE_WRITE))
4215 return false;
4216 rpc_restart_call_prepare(task);
4217 return true;
4218}
4219
4220static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4221{
4222 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4223 return -EAGAIN;
4224 if (nfs4_write_stateid_changed(task, &hdr->args))
4225 return -EAGAIN;
4226 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4227 nfs4_write_done_cb(task, hdr);
4228}
4229
4230static
4231bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4232{
4233 /* Don't request attributes for pNFS or O_DIRECT writes */
4234 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4235 return false;
4236 /* Otherwise, request attributes if and only if we don't hold
4237 * a delegation
4238 */
4239 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4240}
4241
4242static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4243 struct rpc_message *msg)
4244{
4245 struct nfs_server *server = NFS_SERVER(hdr->inode);
4246
4247 if (!nfs4_write_need_cache_consistency_data(hdr)) {
4248 hdr->args.bitmask = NULL;
4249 hdr->res.fattr = NULL;
4250 } else
4251 hdr->args.bitmask = server->cache_consistency_bitmask;
4252
4253 if (!hdr->pgio_done_cb)
4254 hdr->pgio_done_cb = nfs4_write_done_cb;
4255 hdr->res.server = server;
4256 hdr->timestamp = jiffies;
4257
4258 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4259 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4260}
4261
4262static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4263{
4264 nfs4_setup_sequence(NFS_SERVER(data->inode),
4265 &data->args.seq_args,
4266 &data->res.seq_res,
4267 task);
4268}
4269
4270static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4271{
4272 struct inode *inode = data->inode;
4273
4274 trace_nfs4_commit(data, task->tk_status);
4275 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4276 NULL, NULL) == -EAGAIN) {
4277 rpc_restart_call_prepare(task);
4278 return -EAGAIN;
4279 }
4280 return 0;
4281}
4282
4283static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4284{
4285 if (!nfs4_sequence_done(task, &data->res.seq_res))
4286 return -EAGAIN;
4287 return data->commit_done_cb(task, data);
4288}
4289
4290static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4291{
4292 struct nfs_server *server = NFS_SERVER(data->inode);
4293
4294 if (data->commit_done_cb == NULL)
4295 data->commit_done_cb = nfs4_commit_done_cb;
4296 data->res.server = server;
4297 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4298 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4299}
4300
4301struct nfs4_renewdata {
4302 struct nfs_client *client;
4303 unsigned long timestamp;
4304};
4305
4306/*
4307 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4308 * standalone procedure for queueing an asynchronous RENEW.
4309 */
4310static void nfs4_renew_release(void *calldata)
4311{
4312 struct nfs4_renewdata *data = calldata;
4313 struct nfs_client *clp = data->client;
4314
4315 if (atomic_read(&clp->cl_count) > 1)
4316 nfs4_schedule_state_renewal(clp);
4317 nfs_put_client(clp);
4318 kfree(data);
4319}
4320
4321static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4322{
4323 struct nfs4_renewdata *data = calldata;
4324 struct nfs_client *clp = data->client;
4325 unsigned long timestamp = data->timestamp;
4326
4327 trace_nfs4_renew_async(clp, task->tk_status);
4328 switch (task->tk_status) {
4329 case 0:
4330 break;
4331 case -NFS4ERR_LEASE_MOVED:
4332 nfs4_schedule_lease_moved_recovery(clp);
4333 break;
4334 default:
4335 /* Unless we're shutting down, schedule state recovery! */
4336 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4337 return;
4338 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4339 nfs4_schedule_lease_recovery(clp);
4340 return;
4341 }
4342 nfs4_schedule_path_down_recovery(clp);
4343 }
4344 do_renew_lease(clp, timestamp);
4345}
4346
4347static const struct rpc_call_ops nfs4_renew_ops = {
4348 .rpc_call_done = nfs4_renew_done,
4349 .rpc_release = nfs4_renew_release,
4350};
4351
4352static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4353{
4354 struct rpc_message msg = {
4355 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4356 .rpc_argp = clp,
4357 .rpc_cred = cred,
4358 };
4359 struct nfs4_renewdata *data;
4360
4361 if (renew_flags == 0)
4362 return 0;
4363 if (!atomic_inc_not_zero(&clp->cl_count))
4364 return -EIO;
4365 data = kmalloc(sizeof(*data), GFP_NOFS);
4366 if (data == NULL)
4367 return -ENOMEM;
4368 data->client = clp;
4369 data->timestamp = jiffies;
4370 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4371 &nfs4_renew_ops, data);
4372}
4373
4374static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4375{
4376 struct rpc_message msg = {
4377 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4378 .rpc_argp = clp,
4379 .rpc_cred = cred,
4380 };
4381 unsigned long now = jiffies;
4382 int status;
4383
4384 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4385 if (status < 0)
4386 return status;
4387 do_renew_lease(clp, now);
4388 return 0;
4389}
4390
4391static inline int nfs4_server_supports_acls(struct nfs_server *server)
4392{
4393 return server->caps & NFS_CAP_ACLS;
4394}
4395
4396/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4397 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4398 * the stack.
4399 */
4400#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4401
4402static int buf_to_pages_noslab(const void *buf, size_t buflen,
4403 struct page **pages, unsigned int *pgbase)
4404{
4405 struct page *newpage, **spages;
4406 int rc = 0;
4407 size_t len;
4408 spages = pages;
4409
4410 do {
4411 len = min_t(size_t, PAGE_SIZE, buflen);
4412 newpage = alloc_page(GFP_KERNEL);
4413
4414 if (newpage == NULL)
4415 goto unwind;
4416 memcpy(page_address(newpage), buf, len);
4417 buf += len;
4418 buflen -= len;
4419 *pages++ = newpage;
4420 rc++;
4421 } while (buflen != 0);
4422
4423 return rc;
4424
4425unwind:
4426 for(; rc > 0; rc--)
4427 __free_page(spages[rc-1]);
4428 return -ENOMEM;
4429}
4430
4431struct nfs4_cached_acl {
4432 int cached;
4433 size_t len;
4434 char data[0];
4435};
4436
4437static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4438{
4439 struct nfs_inode *nfsi = NFS_I(inode);
4440
4441 spin_lock(&inode->i_lock);
4442 kfree(nfsi->nfs4_acl);
4443 nfsi->nfs4_acl = acl;
4444 spin_unlock(&inode->i_lock);
4445}
4446
4447static void nfs4_zap_acl_attr(struct inode *inode)
4448{
4449 nfs4_set_cached_acl(inode, NULL);
4450}
4451
4452static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4453{
4454 struct nfs_inode *nfsi = NFS_I(inode);
4455 struct nfs4_cached_acl *acl;
4456 int ret = -ENOENT;
4457
4458 spin_lock(&inode->i_lock);
4459 acl = nfsi->nfs4_acl;
4460 if (acl == NULL)
4461 goto out;
4462 if (buf == NULL) /* user is just asking for length */
4463 goto out_len;
4464 if (acl->cached == 0)
4465 goto out;
4466 ret = -ERANGE; /* see getxattr(2) man page */
4467 if (acl->len > buflen)
4468 goto out;
4469 memcpy(buf, acl->data, acl->len);
4470out_len:
4471 ret = acl->len;
4472out:
4473 spin_unlock(&inode->i_lock);
4474 return ret;
4475}
4476
4477static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4478{
4479 struct nfs4_cached_acl *acl;
4480 size_t buflen = sizeof(*acl) + acl_len;
4481
4482 if (buflen <= PAGE_SIZE) {
4483 acl = kmalloc(buflen, GFP_KERNEL);
4484 if (acl == NULL)
4485 goto out;
4486 acl->cached = 1;
4487 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4488 } else {
4489 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4490 if (acl == NULL)
4491 goto out;
4492 acl->cached = 0;
4493 }
4494 acl->len = acl_len;
4495out:
4496 nfs4_set_cached_acl(inode, acl);
4497}
4498
4499/*
4500 * The getxattr API returns the required buffer length when called with a
4501 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4502 * the required buf. On a NULL buf, we send a page of data to the server
4503 * guessing that the ACL request can be serviced by a page. If so, we cache
4504 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4505 * the cache. If not so, we throw away the page, and cache the required
4506 * length. The next getxattr call will then produce another round trip to
4507 * the server, this time with the input buf of the required size.
4508 */
4509static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4510{
4511 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4512 struct nfs_getaclargs args = {
4513 .fh = NFS_FH(inode),
4514 .acl_pages = pages,
4515 .acl_len = buflen,
4516 };
4517 struct nfs_getaclres res = {
4518 .acl_len = buflen,
4519 };
4520 struct rpc_message msg = {
4521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4522 .rpc_argp = &args,
4523 .rpc_resp = &res,
4524 };
4525 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4526 int ret = -ENOMEM, i;
4527
4528 /* As long as we're doing a round trip to the server anyway,
4529 * let's be prepared for a page of acl data. */
4530 if (npages == 0)
4531 npages = 1;
4532 if (npages > ARRAY_SIZE(pages))
4533 return -ERANGE;
4534
4535 for (i = 0; i < npages; i++) {
4536 pages[i] = alloc_page(GFP_KERNEL);
4537 if (!pages[i])
4538 goto out_free;
4539 }
4540
4541 /* for decoding across pages */
4542 res.acl_scratch = alloc_page(GFP_KERNEL);
4543 if (!res.acl_scratch)
4544 goto out_free;
4545
4546 args.acl_len = npages * PAGE_SIZE;
4547 args.acl_pgbase = 0;
4548
4549 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4550 __func__, buf, buflen, npages, args.acl_len);
4551 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4552 &msg, &args.seq_args, &res.seq_res, 0);
4553 if (ret)
4554 goto out_free;
4555
4556 /* Handle the case where the passed-in buffer is too short */
4557 if (res.acl_flags & NFS4_ACL_TRUNC) {
4558 /* Did the user only issue a request for the acl length? */
4559 if (buf == NULL)
4560 goto out_ok;
4561 ret = -ERANGE;
4562 goto out_free;
4563 }
4564 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4565 if (buf) {
4566 if (res.acl_len > buflen) {
4567 ret = -ERANGE;
4568 goto out_free;
4569 }
4570 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4571 }
4572out_ok:
4573 ret = res.acl_len;
4574out_free:
4575 for (i = 0; i < npages; i++)
4576 if (pages[i])
4577 __free_page(pages[i]);
4578 if (res.acl_scratch)
4579 __free_page(res.acl_scratch);
4580 return ret;
4581}
4582
4583static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4584{
4585 struct nfs4_exception exception = { };
4586 ssize_t ret;
4587 do {
4588 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4589 trace_nfs4_get_acl(inode, ret);
4590 if (ret >= 0)
4591 break;
4592 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4593 } while (exception.retry);
4594 return ret;
4595}
4596
4597static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4598{
4599 struct nfs_server *server = NFS_SERVER(inode);
4600 int ret;
4601
4602 if (!nfs4_server_supports_acls(server))
4603 return -EOPNOTSUPP;
4604 ret = nfs_revalidate_inode(server, inode);
4605 if (ret < 0)
4606 return ret;
4607 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4608 nfs_zap_acl_cache(inode);
4609 ret = nfs4_read_cached_acl(inode, buf, buflen);
4610 if (ret != -ENOENT)
4611 /* -ENOENT is returned if there is no ACL or if there is an ACL
4612 * but no cached acl data, just the acl length */
4613 return ret;
4614 return nfs4_get_acl_uncached(inode, buf, buflen);
4615}
4616
4617static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4618{
4619 struct nfs_server *server = NFS_SERVER(inode);
4620 struct page *pages[NFS4ACL_MAXPAGES];
4621 struct nfs_setaclargs arg = {
4622 .fh = NFS_FH(inode),
4623 .acl_pages = pages,
4624 .acl_len = buflen,
4625 };
4626 struct nfs_setaclres res;
4627 struct rpc_message msg = {
4628 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4629 .rpc_argp = &arg,
4630 .rpc_resp = &res,
4631 };
4632 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4633 int ret, i;
4634
4635 if (!nfs4_server_supports_acls(server))
4636 return -EOPNOTSUPP;
4637 if (npages > ARRAY_SIZE(pages))
4638 return -ERANGE;
4639 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4640 if (i < 0)
4641 return i;
4642 nfs4_inode_return_delegation(inode);
4643 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4644
4645 /*
4646 * Free each page after tx, so the only ref left is
4647 * held by the network stack
4648 */
4649 for (; i > 0; i--)
4650 put_page(pages[i-1]);
4651
4652 /*
4653 * Acl update can result in inode attribute update.
4654 * so mark the attribute cache invalid.
4655 */
4656 spin_lock(&inode->i_lock);
4657 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4658 spin_unlock(&inode->i_lock);
4659 nfs_access_zap_cache(inode);
4660 nfs_zap_acl_cache(inode);
4661 return ret;
4662}
4663
4664static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4665{
4666 struct nfs4_exception exception = { };
4667 int err;
4668 do {
4669 err = __nfs4_proc_set_acl(inode, buf, buflen);
4670 trace_nfs4_set_acl(inode, err);
4671 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4672 &exception);
4673 } while (exception.retry);
4674 return err;
4675}
4676
4677#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4678static int _nfs4_get_security_label(struct inode *inode, void *buf,
4679 size_t buflen)
4680{
4681 struct nfs_server *server = NFS_SERVER(inode);
4682 struct nfs_fattr fattr;
4683 struct nfs4_label label = {0, 0, buflen, buf};
4684
4685 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4686 struct nfs4_getattr_arg arg = {
4687 .fh = NFS_FH(inode),
4688 .bitmask = bitmask,
4689 };
4690 struct nfs4_getattr_res res = {
4691 .fattr = &fattr,
4692 .label = &label,
4693 .server = server,
4694 };
4695 struct rpc_message msg = {
4696 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4697 .rpc_argp = &arg,
4698 .rpc_resp = &res,
4699 };
4700 int ret;
4701
4702 nfs_fattr_init(&fattr);
4703
4704 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4705 if (ret)
4706 return ret;
4707 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4708 return -ENOENT;
4709 if (buflen < label.len)
4710 return -ERANGE;
4711 return 0;
4712}
4713
4714static int nfs4_get_security_label(struct inode *inode, void *buf,
4715 size_t buflen)
4716{
4717 struct nfs4_exception exception = { };
4718 int err;
4719
4720 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4721 return -EOPNOTSUPP;
4722
4723 do {
4724 err = _nfs4_get_security_label(inode, buf, buflen);
4725 trace_nfs4_get_security_label(inode, err);
4726 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4727 &exception);
4728 } while (exception.retry);
4729 return err;
4730}
4731
4732static int _nfs4_do_set_security_label(struct inode *inode,
4733 struct nfs4_label *ilabel,
4734 struct nfs_fattr *fattr,
4735 struct nfs4_label *olabel)
4736{
4737
4738 struct iattr sattr = {0};
4739 struct nfs_server *server = NFS_SERVER(inode);
4740 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4741 struct nfs_setattrargs arg = {
4742 .fh = NFS_FH(inode),
4743 .iap = &sattr,
4744 .server = server,
4745 .bitmask = bitmask,
4746 .label = ilabel,
4747 };
4748 struct nfs_setattrres res = {
4749 .fattr = fattr,
4750 .label = olabel,
4751 .server = server,
4752 };
4753 struct rpc_message msg = {
4754 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4755 .rpc_argp = &arg,
4756 .rpc_resp = &res,
4757 };
4758 int status;
4759
4760 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4761
4762 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4763 if (status)
4764 dprintk("%s failed: %d\n", __func__, status);
4765
4766 return status;
4767}
4768
4769static int nfs4_do_set_security_label(struct inode *inode,
4770 struct nfs4_label *ilabel,
4771 struct nfs_fattr *fattr,
4772 struct nfs4_label *olabel)
4773{
4774 struct nfs4_exception exception = { };
4775 int err;
4776
4777 do {
4778 err = _nfs4_do_set_security_label(inode, ilabel,
4779 fattr, olabel);
4780 trace_nfs4_set_security_label(inode, err);
4781 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4782 &exception);
4783 } while (exception.retry);
4784 return err;
4785}
4786
4787static int
4788nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4789{
4790 struct nfs4_label ilabel, *olabel = NULL;
4791 struct nfs_fattr fattr;
4792 struct rpc_cred *cred;
4793 struct inode *inode = dentry->d_inode;
4794 int status;
4795
4796 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4797 return -EOPNOTSUPP;
4798
4799 nfs_fattr_init(&fattr);
4800
4801 ilabel.pi = 0;
4802 ilabel.lfs = 0;
4803 ilabel.label = (char *)buf;
4804 ilabel.len = buflen;
4805
4806 cred = rpc_lookup_cred();
4807 if (IS_ERR(cred))
4808 return PTR_ERR(cred);
4809
4810 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4811 if (IS_ERR(olabel)) {
4812 status = -PTR_ERR(olabel);
4813 goto out;
4814 }
4815
4816 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4817 if (status == 0)
4818 nfs_setsecurity(inode, &fattr, olabel);
4819
4820 nfs4_label_free(olabel);
4821out:
4822 put_rpccred(cred);
4823 return status;
4824}
4825#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4826
4827
4828static int
4829nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4830 struct nfs4_state *state, long *timeout)
4831{
4832 struct nfs_client *clp = server->nfs_client;
4833
4834 if (task->tk_status >= 0)
4835 return 0;
4836 switch(task->tk_status) {
4837 case -NFS4ERR_DELEG_REVOKED:
4838 case -NFS4ERR_ADMIN_REVOKED:
4839 case -NFS4ERR_BAD_STATEID:
4840 case -NFS4ERR_OPENMODE:
4841 if (state == NULL)
4842 break;
4843 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4844 goto recovery_failed;
4845 goto wait_on_recovery;
4846 case -NFS4ERR_EXPIRED:
4847 if (state != NULL) {
4848 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4849 goto recovery_failed;
4850 }
4851 case -NFS4ERR_STALE_STATEID:
4852 case -NFS4ERR_STALE_CLIENTID:
4853 nfs4_schedule_lease_recovery(clp);
4854 goto wait_on_recovery;
4855 case -NFS4ERR_MOVED:
4856 if (nfs4_schedule_migration_recovery(server) < 0)
4857 goto recovery_failed;
4858 goto wait_on_recovery;
4859 case -NFS4ERR_LEASE_MOVED:
4860 nfs4_schedule_lease_moved_recovery(clp);
4861 goto wait_on_recovery;
4862#if defined(CONFIG_NFS_V4_1)
4863 case -NFS4ERR_BADSESSION:
4864 case -NFS4ERR_BADSLOT:
4865 case -NFS4ERR_BAD_HIGH_SLOT:
4866 case -NFS4ERR_DEADSESSION:
4867 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4868 case -NFS4ERR_SEQ_FALSE_RETRY:
4869 case -NFS4ERR_SEQ_MISORDERED:
4870 dprintk("%s ERROR %d, Reset session\n", __func__,
4871 task->tk_status);
4872 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4873 goto wait_on_recovery;
4874#endif /* CONFIG_NFS_V4_1 */
4875 case -NFS4ERR_DELAY:
4876 nfs_inc_server_stats(server, NFSIOS_DELAY);
4877 rpc_delay(task, nfs4_update_delay(timeout));
4878 goto restart_call;
4879 case -NFS4ERR_GRACE:
4880 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4881 case -NFS4ERR_RETRY_UNCACHED_REP:
4882 case -NFS4ERR_OLD_STATEID:
4883 goto restart_call;
4884 }
4885 task->tk_status = nfs4_map_errors(task->tk_status);
4886 return 0;
4887recovery_failed:
4888 task->tk_status = -EIO;
4889 return 0;
4890wait_on_recovery:
4891 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4892 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4893 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4894 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4895 goto recovery_failed;
4896restart_call:
4897 task->tk_status = 0;
4898 return -EAGAIN;
4899}
4900
4901static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4902 nfs4_verifier *bootverf)
4903{
4904 __be32 verf[2];
4905
4906 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4907 /* An impossible timestamp guarantees this value
4908 * will never match a generated boot time. */
4909 verf[0] = 0;
4910 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4911 } else {
4912 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4913 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4914 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4915 }
4916 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4917}
4918
4919static unsigned int
4920nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4921 char *buf, size_t len)
4922{
4923 unsigned int result;
4924
4925 rcu_read_lock();
4926 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4927 clp->cl_ipaddr,
4928 rpc_peeraddr2str(clp->cl_rpcclient,
4929 RPC_DISPLAY_ADDR),
4930 rpc_peeraddr2str(clp->cl_rpcclient,
4931 RPC_DISPLAY_PROTO));
4932 rcu_read_unlock();
4933 return result;
4934}
4935
4936static unsigned int
4937nfs4_init_uniform_client_string(const struct nfs_client *clp,
4938 char *buf, size_t len)
4939{
4940 const char *nodename = clp->cl_rpcclient->cl_nodename;
4941
4942 if (nfs4_client_id_uniquifier[0] != '\0')
4943 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4944 clp->rpc_ops->version,
4945 clp->cl_minorversion,
4946 nfs4_client_id_uniquifier,
4947 nodename);
4948 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4949 clp->rpc_ops->version, clp->cl_minorversion,
4950 nodename);
4951}
4952
4953/*
4954 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4955 * services. Advertise one based on the address family of the
4956 * clientaddr.
4957 */
4958static unsigned int
4959nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4960{
4961 if (strchr(clp->cl_ipaddr, ':') != NULL)
4962 return scnprintf(buf, len, "tcp6");
4963 else
4964 return scnprintf(buf, len, "tcp");
4965}
4966
4967static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4968{
4969 struct nfs4_setclientid *sc = calldata;
4970
4971 if (task->tk_status == 0)
4972 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4973}
4974
4975static const struct rpc_call_ops nfs4_setclientid_ops = {
4976 .rpc_call_done = nfs4_setclientid_done,
4977};
4978
4979/**
4980 * nfs4_proc_setclientid - Negotiate client ID
4981 * @clp: state data structure
4982 * @program: RPC program for NFSv4 callback service
4983 * @port: IP port number for NFS4 callback service
4984 * @cred: RPC credential to use for this call
4985 * @res: where to place the result
4986 *
4987 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4988 */
4989int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4990 unsigned short port, struct rpc_cred *cred,
4991 struct nfs4_setclientid_res *res)
4992{
4993 nfs4_verifier sc_verifier;
4994 struct nfs4_setclientid setclientid = {
4995 .sc_verifier = &sc_verifier,
4996 .sc_prog = program,
4997 .sc_cb_ident = clp->cl_cb_ident,
4998 };
4999 struct rpc_message msg = {
5000 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5001 .rpc_argp = &setclientid,
5002 .rpc_resp = res,
5003 .rpc_cred = cred,
5004 };
5005 struct rpc_task *task;
5006 struct rpc_task_setup task_setup_data = {
5007 .rpc_client = clp->cl_rpcclient,
5008 .rpc_message = &msg,
5009 .callback_ops = &nfs4_setclientid_ops,
5010 .callback_data = &setclientid,
5011 .flags = RPC_TASK_TIMEOUT,
5012 };
5013 int status;
5014
5015 /* nfs_client_id4 */
5016 nfs4_init_boot_verifier(clp, &sc_verifier);
5017 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5018 setclientid.sc_name_len =
5019 nfs4_init_uniform_client_string(clp,
5020 setclientid.sc_name,
5021 sizeof(setclientid.sc_name));
5022 else
5023 setclientid.sc_name_len =
5024 nfs4_init_nonuniform_client_string(clp,
5025 setclientid.sc_name,
5026 sizeof(setclientid.sc_name));
5027 /* cb_client4 */
5028 setclientid.sc_netid_len =
5029 nfs4_init_callback_netid(clp,
5030 setclientid.sc_netid,
5031 sizeof(setclientid.sc_netid));
5032 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5033 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5034 clp->cl_ipaddr, port >> 8, port & 255);
5035
5036 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
5037 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5038 setclientid.sc_name_len, setclientid.sc_name);
5039 task = rpc_run_task(&task_setup_data);
5040 if (IS_ERR(task)) {
5041 status = PTR_ERR(task);
5042 goto out;
5043 }
5044 status = task->tk_status;
5045 if (setclientid.sc_cred) {
5046 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5047 put_rpccred(setclientid.sc_cred);
5048 }
5049 rpc_put_task(task);
5050out:
5051 trace_nfs4_setclientid(clp, status);
5052 dprintk("NFS reply setclientid: %d\n", status);
5053 return status;
5054}
5055
5056/**
5057 * nfs4_proc_setclientid_confirm - Confirm client ID
5058 * @clp: state data structure
5059 * @res: result of a previous SETCLIENTID
5060 * @cred: RPC credential to use for this call
5061 *
5062 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5063 */
5064int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5065 struct nfs4_setclientid_res *arg,
5066 struct rpc_cred *cred)
5067{
5068 struct rpc_message msg = {
5069 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5070 .rpc_argp = arg,
5071 .rpc_cred = cred,
5072 };
5073 int status;
5074
5075 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5076 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5077 clp->cl_clientid);
5078 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5079 trace_nfs4_setclientid_confirm(clp, status);
5080 dprintk("NFS reply setclientid_confirm: %d\n", status);
5081 return status;
5082}
5083
5084struct nfs4_delegreturndata {
5085 struct nfs4_delegreturnargs args;
5086 struct nfs4_delegreturnres res;
5087 struct nfs_fh fh;
5088 nfs4_stateid stateid;
5089 unsigned long timestamp;
5090 struct nfs_fattr fattr;
5091 int rpc_status;
5092 struct inode *inode;
5093 bool roc;
5094 u32 roc_barrier;
5095};
5096
5097static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5098{
5099 struct nfs4_delegreturndata *data = calldata;
5100
5101 if (!nfs4_sequence_done(task, &data->res.seq_res))
5102 return;
5103
5104 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5105 switch (task->tk_status) {
5106 case 0:
5107 renew_lease(data->res.server, data->timestamp);
5108 case -NFS4ERR_ADMIN_REVOKED:
5109 case -NFS4ERR_DELEG_REVOKED:
5110 case -NFS4ERR_BAD_STATEID:
5111 case -NFS4ERR_OLD_STATEID:
5112 case -NFS4ERR_STALE_STATEID:
5113 case -NFS4ERR_EXPIRED:
5114 task->tk_status = 0;
5115 if (data->roc)
5116 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5117 break;
5118 default:
5119 if (nfs4_async_handle_error(task, data->res.server,
5120 NULL, NULL) == -EAGAIN) {
5121 rpc_restart_call_prepare(task);
5122 return;
5123 }
5124 }
5125 data->rpc_status = task->tk_status;
5126}
5127
5128static void nfs4_delegreturn_release(void *calldata)
5129{
5130 struct nfs4_delegreturndata *data = calldata;
5131
5132 if (data->roc)
5133 pnfs_roc_release(data->inode);
5134 kfree(calldata);
5135}
5136
5137static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5138{
5139 struct nfs4_delegreturndata *d_data;
5140
5141 d_data = (struct nfs4_delegreturndata *)data;
5142
5143 if (d_data->roc &&
5144 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5145 return;
5146
5147 nfs4_setup_sequence(d_data->res.server,
5148 &d_data->args.seq_args,
5149 &d_data->res.seq_res,
5150 task);
5151}
5152
5153static const struct rpc_call_ops nfs4_delegreturn_ops = {
5154 .rpc_call_prepare = nfs4_delegreturn_prepare,
5155 .rpc_call_done = nfs4_delegreturn_done,
5156 .rpc_release = nfs4_delegreturn_release,
5157};
5158
5159static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5160{
5161 struct nfs4_delegreturndata *data;
5162 struct nfs_server *server = NFS_SERVER(inode);
5163 struct rpc_task *task;
5164 struct rpc_message msg = {
5165 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5166 .rpc_cred = cred,
5167 };
5168 struct rpc_task_setup task_setup_data = {
5169 .rpc_client = server->client,
5170 .rpc_message = &msg,
5171 .callback_ops = &nfs4_delegreturn_ops,
5172 .flags = RPC_TASK_ASYNC,
5173 };
5174 int status = 0;
5175
5176 data = kzalloc(sizeof(*data), GFP_NOFS);
5177 if (data == NULL)
5178 return -ENOMEM;
5179 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5180 data->args.fhandle = &data->fh;
5181 data->args.stateid = &data->stateid;
5182 data->args.bitmask = server->cache_consistency_bitmask;
5183 nfs_copy_fh(&data->fh, NFS_FH(inode));
5184 nfs4_stateid_copy(&data->stateid, stateid);
5185 data->res.fattr = &data->fattr;
5186 data->res.server = server;
5187 nfs_fattr_init(data->res.fattr);
5188 data->timestamp = jiffies;
5189 data->rpc_status = 0;
5190 data->inode = inode;
5191 data->roc = list_empty(&NFS_I(inode)->open_files) ?
5192 pnfs_roc(inode) : false;
5193
5194 task_setup_data.callback_data = data;
5195 msg.rpc_argp = &data->args;
5196 msg.rpc_resp = &data->res;
5197 task = rpc_run_task(&task_setup_data);
5198 if (IS_ERR(task))
5199 return PTR_ERR(task);
5200 if (!issync)
5201 goto out;
5202 status = nfs4_wait_for_completion_rpc_task(task);
5203 if (status != 0)
5204 goto out;
5205 status = data->rpc_status;
5206 if (status == 0)
5207 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5208 else
5209 nfs_refresh_inode(inode, &data->fattr);
5210out:
5211 rpc_put_task(task);
5212 return status;
5213}
5214
5215int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5216{
5217 struct nfs_server *server = NFS_SERVER(inode);
5218 struct nfs4_exception exception = { };
5219 int err;
5220 do {
5221 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5222 trace_nfs4_delegreturn(inode, err);
5223 switch (err) {
5224 case -NFS4ERR_STALE_STATEID:
5225 case -NFS4ERR_EXPIRED:
5226 case 0:
5227 return 0;
5228 }
5229 err = nfs4_handle_exception(server, err, &exception);
5230 } while (exception.retry);
5231 return err;
5232}
5233
5234#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5235#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5236
5237/*
5238 * sleep, with exponential backoff, and retry the LOCK operation.
5239 */
5240static unsigned long
5241nfs4_set_lock_task_retry(unsigned long timeout)
5242{
5243 freezable_schedule_timeout_killable_unsafe(timeout);
5244 timeout <<= 1;
5245 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5246 return NFS4_LOCK_MAXTIMEOUT;
5247 return timeout;
5248}
5249
5250static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5251{
5252 struct inode *inode = state->inode;
5253 struct nfs_server *server = NFS_SERVER(inode);
5254 struct nfs_client *clp = server->nfs_client;
5255 struct nfs_lockt_args arg = {
5256 .fh = NFS_FH(inode),
5257 .fl = request,
5258 };
5259 struct nfs_lockt_res res = {
5260 .denied = request,
5261 };
5262 struct rpc_message msg = {
5263 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5264 .rpc_argp = &arg,
5265 .rpc_resp = &res,
5266 .rpc_cred = state->owner->so_cred,
5267 };
5268 struct nfs4_lock_state *lsp;
5269 int status;
5270
5271 arg.lock_owner.clientid = clp->cl_clientid;
5272 status = nfs4_set_lock_state(state, request);
5273 if (status != 0)
5274 goto out;
5275 lsp = request->fl_u.nfs4_fl.owner;
5276 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5277 arg.lock_owner.s_dev = server->s_dev;
5278 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5279 switch (status) {
5280 case 0:
5281 request->fl_type = F_UNLCK;
5282 break;
5283 case -NFS4ERR_DENIED:
5284 status = 0;
5285 }
5286 request->fl_ops->fl_release_private(request);
5287 request->fl_ops = NULL;
5288out:
5289 return status;
5290}
5291
5292static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5293{
5294 struct nfs4_exception exception = { };
5295 int err;
5296
5297 do {
5298 err = _nfs4_proc_getlk(state, cmd, request);
5299 trace_nfs4_get_lock(request, state, cmd, err);
5300 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5301 &exception);
5302 } while (exception.retry);
5303 return err;
5304}
5305
5306static int do_vfs_lock(struct file *file, struct file_lock *fl)
5307{
5308 int res = 0;
5309 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5310 case FL_POSIX:
5311 res = posix_lock_file_wait(file, fl);
5312 break;
5313 case FL_FLOCK:
5314 res = flock_lock_file_wait(file, fl);
5315 break;
5316 default:
5317 BUG();
5318 }
5319 return res;
5320}
5321
5322struct nfs4_unlockdata {
5323 struct nfs_locku_args arg;
5324 struct nfs_locku_res res;
5325 struct nfs4_lock_state *lsp;
5326 struct nfs_open_context *ctx;
5327 struct file_lock fl;
5328 const struct nfs_server *server;
5329 unsigned long timestamp;
5330};
5331
5332static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5333 struct nfs_open_context *ctx,
5334 struct nfs4_lock_state *lsp,
5335 struct nfs_seqid *seqid)
5336{
5337 struct nfs4_unlockdata *p;
5338 struct inode *inode = lsp->ls_state->inode;
5339
5340 p = kzalloc(sizeof(*p), GFP_NOFS);
5341 if (p == NULL)
5342 return NULL;
5343 p->arg.fh = NFS_FH(inode);
5344 p->arg.fl = &p->fl;
5345 p->arg.seqid = seqid;
5346 p->res.seqid = seqid;
5347 p->arg.stateid = &lsp->ls_stateid;
5348 p->lsp = lsp;
5349 atomic_inc(&lsp->ls_count);
5350 /* Ensure we don't close file until we're done freeing locks! */
5351 p->ctx = get_nfs_open_context(ctx);
5352 memcpy(&p->fl, fl, sizeof(p->fl));
5353 p->server = NFS_SERVER(inode);
5354 return p;
5355}
5356
5357static void nfs4_locku_release_calldata(void *data)
5358{
5359 struct nfs4_unlockdata *calldata = data;
5360 nfs_free_seqid(calldata->arg.seqid);
5361 nfs4_put_lock_state(calldata->lsp);
5362 put_nfs_open_context(calldata->ctx);
5363 kfree(calldata);
5364}
5365
5366static void nfs4_locku_done(struct rpc_task *task, void *data)
5367{
5368 struct nfs4_unlockdata *calldata = data;
5369
5370 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5371 return;
5372 switch (task->tk_status) {
5373 case 0:
5374 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5375 &calldata->res.stateid);
5376 renew_lease(calldata->server, calldata->timestamp);
5377 break;
5378 case -NFS4ERR_BAD_STATEID:
5379 case -NFS4ERR_OLD_STATEID:
5380 case -NFS4ERR_STALE_STATEID:
5381 case -NFS4ERR_EXPIRED:
5382 break;
5383 default:
5384 if (nfs4_async_handle_error(task, calldata->server,
5385 NULL, NULL) == -EAGAIN)
5386 rpc_restart_call_prepare(task);
5387 }
5388 nfs_release_seqid(calldata->arg.seqid);
5389}
5390
5391static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5392{
5393 struct nfs4_unlockdata *calldata = data;
5394
5395 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5396 goto out_wait;
5397 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5398 /* Note: exit _without_ running nfs4_locku_done */
5399 goto out_no_action;
5400 }
5401 calldata->timestamp = jiffies;
5402 if (nfs4_setup_sequence(calldata->server,
5403 &calldata->arg.seq_args,
5404 &calldata->res.seq_res,
5405 task) != 0)
5406 nfs_release_seqid(calldata->arg.seqid);
5407 return;
5408out_no_action:
5409 task->tk_action = NULL;
5410out_wait:
5411 nfs4_sequence_done(task, &calldata->res.seq_res);
5412}
5413
5414static const struct rpc_call_ops nfs4_locku_ops = {
5415 .rpc_call_prepare = nfs4_locku_prepare,
5416 .rpc_call_done = nfs4_locku_done,
5417 .rpc_release = nfs4_locku_release_calldata,
5418};
5419
5420static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5421 struct nfs_open_context *ctx,
5422 struct nfs4_lock_state *lsp,
5423 struct nfs_seqid *seqid)
5424{
5425 struct nfs4_unlockdata *data;
5426 struct rpc_message msg = {
5427 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5428 .rpc_cred = ctx->cred,
5429 };
5430 struct rpc_task_setup task_setup_data = {
5431 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5432 .rpc_message = &msg,
5433 .callback_ops = &nfs4_locku_ops,
5434 .workqueue = nfsiod_workqueue,
5435 .flags = RPC_TASK_ASYNC,
5436 };
5437
5438 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5439 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5440
5441 /* Ensure this is an unlock - when canceling a lock, the
5442 * canceled lock is passed in, and it won't be an unlock.
5443 */
5444 fl->fl_type = F_UNLCK;
5445
5446 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5447 if (data == NULL) {
5448 nfs_free_seqid(seqid);
5449 return ERR_PTR(-ENOMEM);
5450 }
5451
5452 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5453 msg.rpc_argp = &data->arg;
5454 msg.rpc_resp = &data->res;
5455 task_setup_data.callback_data = data;
5456 return rpc_run_task(&task_setup_data);
5457}
5458
5459static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5460{
5461 struct inode *inode = state->inode;
5462 struct nfs4_state_owner *sp = state->owner;
5463 struct nfs_inode *nfsi = NFS_I(inode);
5464 struct nfs_seqid *seqid;
5465 struct nfs4_lock_state *lsp;
5466 struct rpc_task *task;
5467 int status = 0;
5468 unsigned char fl_flags = request->fl_flags;
5469
5470 status = nfs4_set_lock_state(state, request);
5471 /* Unlock _before_ we do the RPC call */
5472 request->fl_flags |= FL_EXISTS;
5473 /* Exclude nfs_delegation_claim_locks() */
5474 mutex_lock(&sp->so_delegreturn_mutex);
5475 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5476 down_read(&nfsi->rwsem);
5477 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5478 up_read(&nfsi->rwsem);
5479 mutex_unlock(&sp->so_delegreturn_mutex);
5480 goto out;
5481 }
5482 up_read(&nfsi->rwsem);
5483 mutex_unlock(&sp->so_delegreturn_mutex);
5484 if (status != 0)
5485 goto out;
5486 /* Is this a delegated lock? */
5487 lsp = request->fl_u.nfs4_fl.owner;
5488 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5489 goto out;
5490 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5491 status = -ENOMEM;
5492 if (seqid == NULL)
5493 goto out;
5494 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5495 status = PTR_ERR(task);
5496 if (IS_ERR(task))
5497 goto out;
5498 status = nfs4_wait_for_completion_rpc_task(task);
5499 rpc_put_task(task);
5500out:
5501 request->fl_flags = fl_flags;
5502 trace_nfs4_unlock(request, state, F_SETLK, status);
5503 return status;
5504}
5505
5506struct nfs4_lockdata {
5507 struct nfs_lock_args arg;
5508 struct nfs_lock_res res;
5509 struct nfs4_lock_state *lsp;
5510 struct nfs_open_context *ctx;
5511 struct file_lock fl;
5512 unsigned long timestamp;
5513 int rpc_status;
5514 int cancelled;
5515 struct nfs_server *server;
5516};
5517
5518static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5519 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5520 gfp_t gfp_mask)
5521{
5522 struct nfs4_lockdata *p;
5523 struct inode *inode = lsp->ls_state->inode;
5524 struct nfs_server *server = NFS_SERVER(inode);
5525
5526 p = kzalloc(sizeof(*p), gfp_mask);
5527 if (p == NULL)
5528 return NULL;
5529
5530 p->arg.fh = NFS_FH(inode);
5531 p->arg.fl = &p->fl;
5532 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5533 if (p->arg.open_seqid == NULL)
5534 goto out_free;
5535 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5536 if (p->arg.lock_seqid == NULL)
5537 goto out_free_seqid;
5538 p->arg.lock_stateid = &lsp->ls_stateid;
5539 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5540 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5541 p->arg.lock_owner.s_dev = server->s_dev;
5542 p->res.lock_seqid = p->arg.lock_seqid;
5543 p->lsp = lsp;
5544 p->server = server;
5545 atomic_inc(&lsp->ls_count);
5546 p->ctx = get_nfs_open_context(ctx);
5547 memcpy(&p->fl, fl, sizeof(p->fl));
5548 return p;
5549out_free_seqid:
5550 nfs_free_seqid(p->arg.open_seqid);
5551out_free:
5552 kfree(p);
5553 return NULL;
5554}
5555
5556static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5557{
5558 struct nfs4_lockdata *data = calldata;
5559 struct nfs4_state *state = data->lsp->ls_state;
5560
5561 dprintk("%s: begin!\n", __func__);
5562 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5563 goto out_wait;
5564 /* Do we need to do an open_to_lock_owner? */
5565 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5566 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5567 goto out_release_lock_seqid;
5568 }
5569 data->arg.open_stateid = &state->open_stateid;
5570 data->arg.new_lock_owner = 1;
5571 data->res.open_seqid = data->arg.open_seqid;
5572 } else
5573 data->arg.new_lock_owner = 0;
5574 if (!nfs4_valid_open_stateid(state)) {
5575 data->rpc_status = -EBADF;
5576 task->tk_action = NULL;
5577 goto out_release_open_seqid;
5578 }
5579 data->timestamp = jiffies;
5580 if (nfs4_setup_sequence(data->server,
5581 &data->arg.seq_args,
5582 &data->res.seq_res,
5583 task) == 0)
5584 return;
5585out_release_open_seqid:
5586 nfs_release_seqid(data->arg.open_seqid);
5587out_release_lock_seqid:
5588 nfs_release_seqid(data->arg.lock_seqid);
5589out_wait:
5590 nfs4_sequence_done(task, &data->res.seq_res);
5591 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5592}
5593
5594static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5595{
5596 struct nfs4_lockdata *data = calldata;
5597
5598 dprintk("%s: begin!\n", __func__);
5599
5600 if (!nfs4_sequence_done(task, &data->res.seq_res))
5601 return;
5602
5603 data->rpc_status = task->tk_status;
5604 if (data->arg.new_lock_owner != 0) {
5605 if (data->rpc_status == 0)
5606 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5607 else
5608 goto out;
5609 }
5610 if (data->rpc_status == 0) {
5611 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5612 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5613 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5614 }
5615out:
5616 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5617}
5618
5619static void nfs4_lock_release(void *calldata)
5620{
5621 struct nfs4_lockdata *data = calldata;
5622
5623 dprintk("%s: begin!\n", __func__);
5624 nfs_free_seqid(data->arg.open_seqid);
5625 if (data->cancelled != 0) {
5626 struct rpc_task *task;
5627 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5628 data->arg.lock_seqid);
5629 if (!IS_ERR(task))
5630 rpc_put_task_async(task);
5631 dprintk("%s: cancelling lock!\n", __func__);
5632 } else
5633 nfs_free_seqid(data->arg.lock_seqid);
5634 nfs4_put_lock_state(data->lsp);
5635 put_nfs_open_context(data->ctx);
5636 kfree(data);
5637 dprintk("%s: done!\n", __func__);
5638}
5639
5640static const struct rpc_call_ops nfs4_lock_ops = {
5641 .rpc_call_prepare = nfs4_lock_prepare,
5642 .rpc_call_done = nfs4_lock_done,
5643 .rpc_release = nfs4_lock_release,
5644};
5645
5646static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5647{
5648 switch (error) {
5649 case -NFS4ERR_ADMIN_REVOKED:
5650 case -NFS4ERR_BAD_STATEID:
5651 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5652 if (new_lock_owner != 0 ||
5653 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5654 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5655 break;
5656 case -NFS4ERR_STALE_STATEID:
5657 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5658 case -NFS4ERR_EXPIRED:
5659 nfs4_schedule_lease_recovery(server->nfs_client);
5660 };
5661}
5662
5663static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5664{
5665 struct nfs4_lockdata *data;
5666 struct rpc_task *task;
5667 struct rpc_message msg = {
5668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5669 .rpc_cred = state->owner->so_cred,
5670 };
5671 struct rpc_task_setup task_setup_data = {
5672 .rpc_client = NFS_CLIENT(state->inode),
5673 .rpc_message = &msg,
5674 .callback_ops = &nfs4_lock_ops,
5675 .workqueue = nfsiod_workqueue,
5676 .flags = RPC_TASK_ASYNC,
5677 };
5678 int ret;
5679
5680 dprintk("%s: begin!\n", __func__);
5681 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5682 fl->fl_u.nfs4_fl.owner,
5683 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5684 if (data == NULL)
5685 return -ENOMEM;
5686 if (IS_SETLKW(cmd))
5687 data->arg.block = 1;
5688 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5689 msg.rpc_argp = &data->arg;
5690 msg.rpc_resp = &data->res;
5691 task_setup_data.callback_data = data;
5692 if (recovery_type > NFS_LOCK_NEW) {
5693 if (recovery_type == NFS_LOCK_RECLAIM)
5694 data->arg.reclaim = NFS_LOCK_RECLAIM;
5695 nfs4_set_sequence_privileged(&data->arg.seq_args);
5696 }
5697 task = rpc_run_task(&task_setup_data);
5698 if (IS_ERR(task))
5699 return PTR_ERR(task);
5700 ret = nfs4_wait_for_completion_rpc_task(task);
5701 if (ret == 0) {
5702 ret = data->rpc_status;
5703 if (ret)
5704 nfs4_handle_setlk_error(data->server, data->lsp,
5705 data->arg.new_lock_owner, ret);
5706 } else
5707 data->cancelled = 1;
5708 rpc_put_task(task);
5709 dprintk("%s: done, ret = %d!\n", __func__, ret);
5710 return ret;
5711}
5712
5713static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5714{
5715 struct nfs_server *server = NFS_SERVER(state->inode);
5716 struct nfs4_exception exception = {
5717 .inode = state->inode,
5718 };
5719 int err;
5720
5721 do {
5722 /* Cache the lock if possible... */
5723 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5724 return 0;
5725 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5726 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5727 if (err != -NFS4ERR_DELAY)
5728 break;
5729 nfs4_handle_exception(server, err, &exception);
5730 } while (exception.retry);
5731 return err;
5732}
5733
5734static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5735{
5736 struct nfs_server *server = NFS_SERVER(state->inode);
5737 struct nfs4_exception exception = {
5738 .inode = state->inode,
5739 };
5740 int err;
5741
5742 err = nfs4_set_lock_state(state, request);
5743 if (err != 0)
5744 return err;
5745 if (!recover_lost_locks) {
5746 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5747 return 0;
5748 }
5749 do {
5750 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5751 return 0;
5752 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5753 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5754 switch (err) {
5755 default:
5756 goto out;
5757 case -NFS4ERR_GRACE:
5758 case -NFS4ERR_DELAY:
5759 nfs4_handle_exception(server, err, &exception);
5760 err = 0;
5761 }
5762 } while (exception.retry);
5763out:
5764 return err;
5765}
5766
5767#if defined(CONFIG_NFS_V4_1)
5768/**
5769 * nfs41_check_expired_locks - possibly free a lock stateid
5770 *
5771 * @state: NFSv4 state for an inode
5772 *
5773 * Returns NFS_OK if recovery for this stateid is now finished.
5774 * Otherwise a negative NFS4ERR value is returned.
5775 */
5776static int nfs41_check_expired_locks(struct nfs4_state *state)
5777{
5778 int status, ret = -NFS4ERR_BAD_STATEID;
5779 struct nfs4_lock_state *lsp;
5780 struct nfs_server *server = NFS_SERVER(state->inode);
5781
5782 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5783 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5784 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5785
5786 status = nfs41_test_stateid(server,
5787 &lsp->ls_stateid,
5788 cred);
5789 trace_nfs4_test_lock_stateid(state, lsp, status);
5790 if (status != NFS_OK) {
5791 /* Free the stateid unless the server
5792 * informs us the stateid is unrecognized. */
5793 if (status != -NFS4ERR_BAD_STATEID)
5794 nfs41_free_stateid(server,
5795 &lsp->ls_stateid,
5796 cred);
5797 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5798 ret = status;
5799 }
5800 }
5801 };
5802
5803 return ret;
5804}
5805
5806static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5807{
5808 int status = NFS_OK;
5809
5810 if (test_bit(LK_STATE_IN_USE, &state->flags))
5811 status = nfs41_check_expired_locks(state);
5812 if (status != NFS_OK)
5813 status = nfs4_lock_expired(state, request);
5814 return status;
5815}
5816#endif
5817
5818static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5819{
5820 struct nfs4_state_owner *sp = state->owner;
5821 struct nfs_inode *nfsi = NFS_I(state->inode);
5822 unsigned char fl_flags = request->fl_flags;
5823 unsigned int seq;
5824 int status = -ENOLCK;
5825
5826 if ((fl_flags & FL_POSIX) &&
5827 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5828 goto out;
5829 /* Is this a delegated open? */
5830 status = nfs4_set_lock_state(state, request);
5831 if (status != 0)
5832 goto out;
5833 request->fl_flags |= FL_ACCESS;
5834 status = do_vfs_lock(request->fl_file, request);
5835 if (status < 0)
5836 goto out;
5837 down_read(&nfsi->rwsem);
5838 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5839 /* Yes: cache locks! */
5840 /* ...but avoid races with delegation recall... */
5841 request->fl_flags = fl_flags & ~FL_SLEEP;
5842 status = do_vfs_lock(request->fl_file, request);
5843 goto out_unlock;
5844 }
5845 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5846 up_read(&nfsi->rwsem);
5847 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5848 if (status != 0)
5849 goto out;
5850 down_read(&nfsi->rwsem);
5851 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5852 status = -NFS4ERR_DELAY;
5853 goto out_unlock;
5854 }
5855 /* Note: we always want to sleep here! */
5856 request->fl_flags = fl_flags | FL_SLEEP;
5857 if (do_vfs_lock(request->fl_file, request) < 0)
5858 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5859 "manager!\n", __func__);
5860out_unlock:
5861 up_read(&nfsi->rwsem);
5862out:
5863 request->fl_flags = fl_flags;
5864 return status;
5865}
5866
5867static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5868{
5869 struct nfs4_exception exception = {
5870 .state = state,
5871 .inode = state->inode,
5872 };
5873 int err;
5874
5875 do {
5876 err = _nfs4_proc_setlk(state, cmd, request);
5877 trace_nfs4_set_lock(request, state, cmd, err);
5878 if (err == -NFS4ERR_DENIED)
5879 err = -EAGAIN;
5880 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5881 err, &exception);
5882 } while (exception.retry);
5883 return err;
5884}
5885
5886static int
5887nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5888{
5889 struct nfs_open_context *ctx;
5890 struct nfs4_state *state;
5891 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5892 int status;
5893
5894 /* verify open state */
5895 ctx = nfs_file_open_context(filp);
5896 state = ctx->state;
5897
5898 if (request->fl_start < 0 || request->fl_end < 0)
5899 return -EINVAL;
5900
5901 if (IS_GETLK(cmd)) {
5902 if (state != NULL)
5903 return nfs4_proc_getlk(state, F_GETLK, request);
5904 return 0;
5905 }
5906
5907 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5908 return -EINVAL;
5909
5910 if (request->fl_type == F_UNLCK) {
5911 if (state != NULL)
5912 return nfs4_proc_unlck(state, cmd, request);
5913 return 0;
5914 }
5915
5916 if (state == NULL)
5917 return -ENOLCK;
5918 /*
5919 * Don't rely on the VFS having checked the file open mode,
5920 * since it won't do this for flock() locks.
5921 */
5922 switch (request->fl_type) {
5923 case F_RDLCK:
5924 if (!(filp->f_mode & FMODE_READ))
5925 return -EBADF;
5926 break;
5927 case F_WRLCK:
5928 if (!(filp->f_mode & FMODE_WRITE))
5929 return -EBADF;
5930 }
5931
5932 do {
5933 status = nfs4_proc_setlk(state, cmd, request);
5934 if ((status != -EAGAIN) || IS_SETLK(cmd))
5935 break;
5936 timeout = nfs4_set_lock_task_retry(timeout);
5937 status = -ERESTARTSYS;
5938 if (signalled())
5939 break;
5940 } while(status < 0);
5941 return status;
5942}
5943
5944int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5945{
5946 struct nfs_server *server = NFS_SERVER(state->inode);
5947 int err;
5948
5949 err = nfs4_set_lock_state(state, fl);
5950 if (err != 0)
5951 return err;
5952 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5953 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5954}
5955
5956struct nfs_release_lockowner_data {
5957 struct nfs4_lock_state *lsp;
5958 struct nfs_server *server;
5959 struct nfs_release_lockowner_args args;
5960 struct nfs_release_lockowner_res res;
5961 unsigned long timestamp;
5962};
5963
5964static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5965{
5966 struct nfs_release_lockowner_data *data = calldata;
5967 struct nfs_server *server = data->server;
5968 nfs40_setup_sequence(server, &data->args.seq_args,
5969 &data->res.seq_res, task);
5970 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5971 data->timestamp = jiffies;
5972}
5973
5974static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5975{
5976 struct nfs_release_lockowner_data *data = calldata;
5977 struct nfs_server *server = data->server;
5978
5979 nfs40_sequence_done(task, &data->res.seq_res);
5980
5981 switch (task->tk_status) {
5982 case 0:
5983 renew_lease(server, data->timestamp);
5984 break;
5985 case -NFS4ERR_STALE_CLIENTID:
5986 case -NFS4ERR_EXPIRED:
5987 nfs4_schedule_lease_recovery(server->nfs_client);
5988 break;
5989 case -NFS4ERR_LEASE_MOVED:
5990 case -NFS4ERR_DELAY:
5991 if (nfs4_async_handle_error(task, server,
5992 NULL, NULL) == -EAGAIN)
5993 rpc_restart_call_prepare(task);
5994 }
5995}
5996
5997static void nfs4_release_lockowner_release(void *calldata)
5998{
5999 struct nfs_release_lockowner_data *data = calldata;
6000 nfs4_free_lock_state(data->server, data->lsp);
6001 kfree(calldata);
6002}
6003
6004static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6005 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6006 .rpc_call_done = nfs4_release_lockowner_done,
6007 .rpc_release = nfs4_release_lockowner_release,
6008};
6009
6010static void
6011nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6012{
6013 struct nfs_release_lockowner_data *data;
6014 struct rpc_message msg = {
6015 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6016 };
6017
6018 if (server->nfs_client->cl_mvops->minor_version != 0)
6019 return;
6020
6021 data = kmalloc(sizeof(*data), GFP_NOFS);
6022 if (!data)
6023 return;
6024 data->lsp = lsp;
6025 data->server = server;
6026 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6027 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6028 data->args.lock_owner.s_dev = server->s_dev;
6029
6030 msg.rpc_argp = &data->args;
6031 msg.rpc_resp = &data->res;
6032 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6033 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6034}
6035
6036#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6037
6038static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6039 const void *buf, size_t buflen,
6040 int flags, int type)
6041{
6042 if (strcmp(key, "") != 0)
6043 return -EINVAL;
6044
6045 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6046}
6047
6048static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6049 void *buf, size_t buflen, int type)
6050{
6051 if (strcmp(key, "") != 0)
6052 return -EINVAL;
6053
6054 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6055}
6056
6057static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6058 size_t list_len, const char *name,
6059 size_t name_len, int type)
6060{
6061 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6062
6063 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6064 return 0;
6065
6066 if (list && len <= list_len)
6067 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6068 return len;
6069}
6070
6071#ifdef CONFIG_NFS_V4_SECURITY_LABEL
6072static inline int nfs4_server_supports_labels(struct nfs_server *server)
6073{
6074 return server->caps & NFS_CAP_SECURITY_LABEL;
6075}
6076
6077static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6078 const void *buf, size_t buflen,
6079 int flags, int type)
6080{
6081 if (security_ismaclabel(key))
6082 return nfs4_set_security_label(dentry, buf, buflen);
6083
6084 return -EOPNOTSUPP;
6085}
6086
6087static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6088 void *buf, size_t buflen, int type)
6089{
6090 if (security_ismaclabel(key))
6091 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6092 return -EOPNOTSUPP;
6093}
6094
6095static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6096 size_t list_len, const char *name,
6097 size_t name_len, int type)
6098{
6099 size_t len = 0;
6100
6101 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6102 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6103 if (list && len <= list_len)
6104 security_inode_listsecurity(dentry->d_inode, list, len);
6105 }
6106 return len;
6107}
6108
6109static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6110 .prefix = XATTR_SECURITY_PREFIX,
6111 .list = nfs4_xattr_list_nfs4_label,
6112 .get = nfs4_xattr_get_nfs4_label,
6113 .set = nfs4_xattr_set_nfs4_label,
6114};
6115#endif
6116
6117
6118/*
6119 * nfs_fhget will use either the mounted_on_fileid or the fileid
6120 */
6121static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6122{
6123 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6124 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6125 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6126 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6127 return;
6128
6129 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6130 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6131 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6132 fattr->nlink = 2;
6133}
6134
6135static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6136 const struct qstr *name,
6137 struct nfs4_fs_locations *fs_locations,
6138 struct page *page)
6139{
6140 struct nfs_server *server = NFS_SERVER(dir);
6141 u32 bitmask[3] = {
6142 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6143 };
6144 struct nfs4_fs_locations_arg args = {
6145 .dir_fh = NFS_FH(dir),
6146 .name = name,
6147 .page = page,
6148 .bitmask = bitmask,
6149 };
6150 struct nfs4_fs_locations_res res = {
6151 .fs_locations = fs_locations,
6152 };
6153 struct rpc_message msg = {
6154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6155 .rpc_argp = &args,
6156 .rpc_resp = &res,
6157 };
6158 int status;
6159
6160 dprintk("%s: start\n", __func__);
6161
6162 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6163 * is not supported */
6164 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6165 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6166 else
6167 bitmask[0] |= FATTR4_WORD0_FILEID;
6168
6169 nfs_fattr_init(&fs_locations->fattr);
6170 fs_locations->server = server;
6171 fs_locations->nlocations = 0;
6172 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6173 dprintk("%s: returned status = %d\n", __func__, status);
6174 return status;
6175}
6176
6177int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6178 const struct qstr *name,
6179 struct nfs4_fs_locations *fs_locations,
6180 struct page *page)
6181{
6182 struct nfs4_exception exception = { };
6183 int err;
6184 do {
6185 err = _nfs4_proc_fs_locations(client, dir, name,
6186 fs_locations, page);
6187 trace_nfs4_get_fs_locations(dir, name, err);
6188 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6189 &exception);
6190 } while (exception.retry);
6191 return err;
6192}
6193
6194/*
6195 * This operation also signals the server that this client is
6196 * performing migration recovery. The server can stop returning
6197 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6198 * appended to this compound to identify the client ID which is
6199 * performing recovery.
6200 */
6201static int _nfs40_proc_get_locations(struct inode *inode,
6202 struct nfs4_fs_locations *locations,
6203 struct page *page, struct rpc_cred *cred)
6204{
6205 struct nfs_server *server = NFS_SERVER(inode);
6206 struct rpc_clnt *clnt = server->client;
6207 u32 bitmask[2] = {
6208 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6209 };
6210 struct nfs4_fs_locations_arg args = {
6211 .clientid = server->nfs_client->cl_clientid,
6212 .fh = NFS_FH(inode),
6213 .page = page,
6214 .bitmask = bitmask,
6215 .migration = 1, /* skip LOOKUP */
6216 .renew = 1, /* append RENEW */
6217 };
6218 struct nfs4_fs_locations_res res = {
6219 .fs_locations = locations,
6220 .migration = 1,
6221 .renew = 1,
6222 };
6223 struct rpc_message msg = {
6224 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6225 .rpc_argp = &args,
6226 .rpc_resp = &res,
6227 .rpc_cred = cred,
6228 };
6229 unsigned long now = jiffies;
6230 int status;
6231
6232 nfs_fattr_init(&locations->fattr);
6233 locations->server = server;
6234 locations->nlocations = 0;
6235
6236 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6237 nfs4_set_sequence_privileged(&args.seq_args);
6238 status = nfs4_call_sync_sequence(clnt, server, &msg,
6239 &args.seq_args, &res.seq_res);
6240 if (status)
6241 return status;
6242
6243 renew_lease(server, now);
6244 return 0;
6245}
6246
6247#ifdef CONFIG_NFS_V4_1
6248
6249/*
6250 * This operation also signals the server that this client is
6251 * performing migration recovery. The server can stop asserting
6252 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6253 * performing this operation is identified in the SEQUENCE
6254 * operation in this compound.
6255 *
6256 * When the client supports GETATTR(fs_locations_info), it can
6257 * be plumbed in here.
6258 */
6259static int _nfs41_proc_get_locations(struct inode *inode,
6260 struct nfs4_fs_locations *locations,
6261 struct page *page, struct rpc_cred *cred)
6262{
6263 struct nfs_server *server = NFS_SERVER(inode);
6264 struct rpc_clnt *clnt = server->client;
6265 u32 bitmask[2] = {
6266 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6267 };
6268 struct nfs4_fs_locations_arg args = {
6269 .fh = NFS_FH(inode),
6270 .page = page,
6271 .bitmask = bitmask,
6272 .migration = 1, /* skip LOOKUP */
6273 };
6274 struct nfs4_fs_locations_res res = {
6275 .fs_locations = locations,
6276 .migration = 1,
6277 };
6278 struct rpc_message msg = {
6279 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6280 .rpc_argp = &args,
6281 .rpc_resp = &res,
6282 .rpc_cred = cred,
6283 };
6284 int status;
6285
6286 nfs_fattr_init(&locations->fattr);
6287 locations->server = server;
6288 locations->nlocations = 0;
6289
6290 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6291 nfs4_set_sequence_privileged(&args.seq_args);
6292 status = nfs4_call_sync_sequence(clnt, server, &msg,
6293 &args.seq_args, &res.seq_res);
6294 if (status == NFS4_OK &&
6295 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6296 status = -NFS4ERR_LEASE_MOVED;
6297 return status;
6298}
6299
6300#endif /* CONFIG_NFS_V4_1 */
6301
6302/**
6303 * nfs4_proc_get_locations - discover locations for a migrated FSID
6304 * @inode: inode on FSID that is migrating
6305 * @locations: result of query
6306 * @page: buffer
6307 * @cred: credential to use for this operation
6308 *
6309 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6310 * operation failed, or a negative errno if a local error occurred.
6311 *
6312 * On success, "locations" is filled in, but if the server has
6313 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6314 * asserted.
6315 *
6316 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6317 * from this client that require migration recovery.
6318 */
6319int nfs4_proc_get_locations(struct inode *inode,
6320 struct nfs4_fs_locations *locations,
6321 struct page *page, struct rpc_cred *cred)
6322{
6323 struct nfs_server *server = NFS_SERVER(inode);
6324 struct nfs_client *clp = server->nfs_client;
6325 const struct nfs4_mig_recovery_ops *ops =
6326 clp->cl_mvops->mig_recovery_ops;
6327 struct nfs4_exception exception = { };
6328 int status;
6329
6330 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6331 (unsigned long long)server->fsid.major,
6332 (unsigned long long)server->fsid.minor,
6333 clp->cl_hostname);
6334 nfs_display_fhandle(NFS_FH(inode), __func__);
6335
6336 do {
6337 status = ops->get_locations(inode, locations, page, cred);
6338 if (status != -NFS4ERR_DELAY)
6339 break;
6340 nfs4_handle_exception(server, status, &exception);
6341 } while (exception.retry);
6342 return status;
6343}
6344
6345/*
6346 * This operation also signals the server that this client is
6347 * performing "lease moved" recovery. The server can stop
6348 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6349 * is appended to this compound to identify the client ID which is
6350 * performing recovery.
6351 */
6352static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6353{
6354 struct nfs_server *server = NFS_SERVER(inode);
6355 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6356 struct rpc_clnt *clnt = server->client;
6357 struct nfs4_fsid_present_arg args = {
6358 .fh = NFS_FH(inode),
6359 .clientid = clp->cl_clientid,
6360 .renew = 1, /* append RENEW */
6361 };
6362 struct nfs4_fsid_present_res res = {
6363 .renew = 1,
6364 };
6365 struct rpc_message msg = {
6366 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6367 .rpc_argp = &args,
6368 .rpc_resp = &res,
6369 .rpc_cred = cred,
6370 };
6371 unsigned long now = jiffies;
6372 int status;
6373
6374 res.fh = nfs_alloc_fhandle();
6375 if (res.fh == NULL)
6376 return -ENOMEM;
6377
6378 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6379 nfs4_set_sequence_privileged(&args.seq_args);
6380 status = nfs4_call_sync_sequence(clnt, server, &msg,
6381 &args.seq_args, &res.seq_res);
6382 nfs_free_fhandle(res.fh);
6383 if (status)
6384 return status;
6385
6386 do_renew_lease(clp, now);
6387 return 0;
6388}
6389
6390#ifdef CONFIG_NFS_V4_1
6391
6392/*
6393 * This operation also signals the server that this client is
6394 * performing "lease moved" recovery. The server can stop asserting
6395 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6396 * this operation is identified in the SEQUENCE operation in this
6397 * compound.
6398 */
6399static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6400{
6401 struct nfs_server *server = NFS_SERVER(inode);
6402 struct rpc_clnt *clnt = server->client;
6403 struct nfs4_fsid_present_arg args = {
6404 .fh = NFS_FH(inode),
6405 };
6406 struct nfs4_fsid_present_res res = {
6407 };
6408 struct rpc_message msg = {
6409 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6410 .rpc_argp = &args,
6411 .rpc_resp = &res,
6412 .rpc_cred = cred,
6413 };
6414 int status;
6415
6416 res.fh = nfs_alloc_fhandle();
6417 if (res.fh == NULL)
6418 return -ENOMEM;
6419
6420 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6421 nfs4_set_sequence_privileged(&args.seq_args);
6422 status = nfs4_call_sync_sequence(clnt, server, &msg,
6423 &args.seq_args, &res.seq_res);
6424 nfs_free_fhandle(res.fh);
6425 if (status == NFS4_OK &&
6426 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6427 status = -NFS4ERR_LEASE_MOVED;
6428 return status;
6429}
6430
6431#endif /* CONFIG_NFS_V4_1 */
6432
6433/**
6434 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6435 * @inode: inode on FSID to check
6436 * @cred: credential to use for this operation
6437 *
6438 * Server indicates whether the FSID is present, moved, or not
6439 * recognized. This operation is necessary to clear a LEASE_MOVED
6440 * condition for this client ID.
6441 *
6442 * Returns NFS4_OK if the FSID is present on this server,
6443 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6444 * NFS4ERR code if some error occurred on the server, or a
6445 * negative errno if a local failure occurred.
6446 */
6447int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6448{
6449 struct nfs_server *server = NFS_SERVER(inode);
6450 struct nfs_client *clp = server->nfs_client;
6451 const struct nfs4_mig_recovery_ops *ops =
6452 clp->cl_mvops->mig_recovery_ops;
6453 struct nfs4_exception exception = { };
6454 int status;
6455
6456 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6457 (unsigned long long)server->fsid.major,
6458 (unsigned long long)server->fsid.minor,
6459 clp->cl_hostname);
6460 nfs_display_fhandle(NFS_FH(inode), __func__);
6461
6462 do {
6463 status = ops->fsid_present(inode, cred);
6464 if (status != -NFS4ERR_DELAY)
6465 break;
6466 nfs4_handle_exception(server, status, &exception);
6467 } while (exception.retry);
6468 return status;
6469}
6470
6471/**
6472 * If 'use_integrity' is true and the state managment nfs_client
6473 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6474 * and the machine credential as per RFC3530bis and RFC5661 Security
6475 * Considerations sections. Otherwise, just use the user cred with the
6476 * filesystem's rpc_client.
6477 */
6478static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6479{
6480 int status;
6481 struct nfs4_secinfo_arg args = {
6482 .dir_fh = NFS_FH(dir),
6483 .name = name,
6484 };
6485 struct nfs4_secinfo_res res = {
6486 .flavors = flavors,
6487 };
6488 struct rpc_message msg = {
6489 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6490 .rpc_argp = &args,
6491 .rpc_resp = &res,
6492 };
6493 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6494 struct rpc_cred *cred = NULL;
6495
6496 if (use_integrity) {
6497 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6498 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6499 msg.rpc_cred = cred;
6500 }
6501
6502 dprintk("NFS call secinfo %s\n", name->name);
6503
6504 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6505 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6506
6507 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6508 &res.seq_res, 0);
6509 dprintk("NFS reply secinfo: %d\n", status);
6510
6511 if (cred)
6512 put_rpccred(cred);
6513
6514 return status;
6515}
6516
6517int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6518 struct nfs4_secinfo_flavors *flavors)
6519{
6520 struct nfs4_exception exception = { };
6521 int err;
6522 do {
6523 err = -NFS4ERR_WRONGSEC;
6524
6525 /* try to use integrity protection with machine cred */
6526 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6527 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6528
6529 /*
6530 * if unable to use integrity protection, or SECINFO with
6531 * integrity protection returns NFS4ERR_WRONGSEC (which is
6532 * disallowed by spec, but exists in deployed servers) use
6533 * the current filesystem's rpc_client and the user cred.
6534 */
6535 if (err == -NFS4ERR_WRONGSEC)
6536 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6537
6538 trace_nfs4_secinfo(dir, name, err);
6539 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6540 &exception);
6541 } while (exception.retry);
6542 return err;
6543}
6544
6545#ifdef CONFIG_NFS_V4_1
6546/*
6547 * Check the exchange flags returned by the server for invalid flags, having
6548 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6549 * DS flags set.
6550 */
6551static int nfs4_check_cl_exchange_flags(u32 flags)
6552{
6553 if (flags & ~EXCHGID4_FLAG_MASK_R)
6554 goto out_inval;
6555 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6556 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6557 goto out_inval;
6558 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6559 goto out_inval;
6560 return NFS_OK;
6561out_inval:
6562 return -NFS4ERR_INVAL;
6563}
6564
6565static bool
6566nfs41_same_server_scope(struct nfs41_server_scope *a,
6567 struct nfs41_server_scope *b)
6568{
6569 if (a->server_scope_sz == b->server_scope_sz &&
6570 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6571 return true;
6572
6573 return false;
6574}
6575
6576/*
6577 * nfs4_proc_bind_conn_to_session()
6578 *
6579 * The 4.1 client currently uses the same TCP connection for the
6580 * fore and backchannel.
6581 */
6582int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6583{
6584 int status;
6585 struct nfs41_bind_conn_to_session_res res;
6586 struct rpc_message msg = {
6587 .rpc_proc =
6588 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6589 .rpc_argp = clp,
6590 .rpc_resp = &res,
6591 .rpc_cred = cred,
6592 };
6593
6594 dprintk("--> %s\n", __func__);
6595
6596 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6597 if (unlikely(res.session == NULL)) {
6598 status = -ENOMEM;
6599 goto out;
6600 }
6601
6602 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6603 trace_nfs4_bind_conn_to_session(clp, status);
6604 if (status == 0) {
6605 if (memcmp(res.session->sess_id.data,
6606 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6607 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6608 status = -EIO;
6609 goto out_session;
6610 }
6611 if (res.dir != NFS4_CDFS4_BOTH) {
6612 dprintk("NFS: %s: Unexpected direction from server\n",
6613 __func__);
6614 status = -EIO;
6615 goto out_session;
6616 }
6617 if (res.use_conn_in_rdma_mode) {
6618 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6619 __func__);
6620 status = -EIO;
6621 goto out_session;
6622 }
6623 }
6624out_session:
6625 kfree(res.session);
6626out:
6627 dprintk("<-- %s status= %d\n", __func__, status);
6628 return status;
6629}
6630
6631/*
6632 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6633 * and operations we'd like to see to enable certain features in the allow map
6634 */
6635static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6636 .how = SP4_MACH_CRED,
6637 .enforce.u.words = {
6638 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6639 1 << (OP_EXCHANGE_ID - 32) |
6640 1 << (OP_CREATE_SESSION - 32) |
6641 1 << (OP_DESTROY_SESSION - 32) |
6642 1 << (OP_DESTROY_CLIENTID - 32)
6643 },
6644 .allow.u.words = {
6645 [0] = 1 << (OP_CLOSE) |
6646 1 << (OP_LOCKU) |
6647 1 << (OP_COMMIT),
6648 [1] = 1 << (OP_SECINFO - 32) |
6649 1 << (OP_SECINFO_NO_NAME - 32) |
6650 1 << (OP_TEST_STATEID - 32) |
6651 1 << (OP_FREE_STATEID - 32) |
6652 1 << (OP_WRITE - 32)
6653 }
6654};
6655
6656/*
6657 * Select the state protection mode for client `clp' given the server results
6658 * from exchange_id in `sp'.
6659 *
6660 * Returns 0 on success, negative errno otherwise.
6661 */
6662static int nfs4_sp4_select_mode(struct nfs_client *clp,
6663 struct nfs41_state_protection *sp)
6664{
6665 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6666 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6667 1 << (OP_EXCHANGE_ID - 32) |
6668 1 << (OP_CREATE_SESSION - 32) |
6669 1 << (OP_DESTROY_SESSION - 32) |
6670 1 << (OP_DESTROY_CLIENTID - 32)
6671 };
6672 unsigned int i;
6673
6674 if (sp->how == SP4_MACH_CRED) {
6675 /* Print state protect result */
6676 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6677 for (i = 0; i <= LAST_NFS4_OP; i++) {
6678 if (test_bit(i, sp->enforce.u.longs))
6679 dfprintk(MOUNT, " enforce op %d\n", i);
6680 if (test_bit(i, sp->allow.u.longs))
6681 dfprintk(MOUNT, " allow op %d\n", i);
6682 }
6683
6684 /* make sure nothing is on enforce list that isn't supported */
6685 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6686 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6687 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6688 return -EINVAL;
6689 }
6690 }
6691
6692 /*
6693 * Minimal mode - state operations are allowed to use machine
6694 * credential. Note this already happens by default, so the
6695 * client doesn't have to do anything more than the negotiation.
6696 *
6697 * NOTE: we don't care if EXCHANGE_ID is in the list -
6698 * we're already using the machine cred for exchange_id
6699 * and will never use a different cred.
6700 */
6701 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6702 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6703 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6704 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6705 dfprintk(MOUNT, "sp4_mach_cred:\n");
6706 dfprintk(MOUNT, " minimal mode enabled\n");
6707 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6708 } else {
6709 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6710 return -EINVAL;
6711 }
6712
6713 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6714 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6715 dfprintk(MOUNT, " cleanup mode enabled\n");
6716 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6717 }
6718
6719 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6720 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6721 dfprintk(MOUNT, " secinfo mode enabled\n");
6722 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6723 }
6724
6725 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6726 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6727 dfprintk(MOUNT, " stateid mode enabled\n");
6728 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6729 }
6730
6731 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6732 dfprintk(MOUNT, " write mode enabled\n");
6733 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6734 }
6735
6736 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6737 dfprintk(MOUNT, " commit mode enabled\n");
6738 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6739 }
6740 }
6741
6742 return 0;
6743}
6744
6745/*
6746 * _nfs4_proc_exchange_id()
6747 *
6748 * Wrapper for EXCHANGE_ID operation.
6749 */
6750static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6751 u32 sp4_how)
6752{
6753 nfs4_verifier verifier;
6754 struct nfs41_exchange_id_args args = {
6755 .verifier = &verifier,
6756 .client = clp,
6757#ifdef CONFIG_NFS_V4_1_MIGRATION
6758 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6759 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6760 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6761#else
6762 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6763 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6764#endif
6765 };
6766 struct nfs41_exchange_id_res res = {
6767 0
6768 };
6769 int status;
6770 struct rpc_message msg = {
6771 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6772 .rpc_argp = &args,
6773 .rpc_resp = &res,
6774 .rpc_cred = cred,
6775 };
6776
6777 nfs4_init_boot_verifier(clp, &verifier);
6778 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6779 sizeof(args.id));
6780 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6781 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6782 args.id_len, args.id);
6783
6784 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6785 GFP_NOFS);
6786 if (unlikely(res.server_owner == NULL)) {
6787 status = -ENOMEM;
6788 goto out;
6789 }
6790
6791 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6792 GFP_NOFS);
6793 if (unlikely(res.server_scope == NULL)) {
6794 status = -ENOMEM;
6795 goto out_server_owner;
6796 }
6797
6798 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6799 if (unlikely(res.impl_id == NULL)) {
6800 status = -ENOMEM;
6801 goto out_server_scope;
6802 }
6803
6804 switch (sp4_how) {
6805 case SP4_NONE:
6806 args.state_protect.how = SP4_NONE;
6807 break;
6808
6809 case SP4_MACH_CRED:
6810 args.state_protect = nfs4_sp4_mach_cred_request;
6811 break;
6812
6813 default:
6814 /* unsupported! */
6815 WARN_ON_ONCE(1);
6816 status = -EINVAL;
6817 goto out_server_scope;
6818 }
6819
6820 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6821 trace_nfs4_exchange_id(clp, status);
6822 if (status == 0)
6823 status = nfs4_check_cl_exchange_flags(res.flags);
6824
6825 if (status == 0)
6826 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6827
6828 if (status == 0) {
6829 clp->cl_clientid = res.clientid;
6830 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6831 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6832 clp->cl_seqid = res.seqid;
6833
6834 kfree(clp->cl_serverowner);
6835 clp->cl_serverowner = res.server_owner;
6836 res.server_owner = NULL;
6837
6838 /* use the most recent implementation id */
6839 kfree(clp->cl_implid);
6840 clp->cl_implid = res.impl_id;
6841
6842 if (clp->cl_serverscope != NULL &&
6843 !nfs41_same_server_scope(clp->cl_serverscope,
6844 res.server_scope)) {
6845 dprintk("%s: server_scope mismatch detected\n",
6846 __func__);
6847 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6848 kfree(clp->cl_serverscope);
6849 clp->cl_serverscope = NULL;
6850 }
6851
6852 if (clp->cl_serverscope == NULL) {
6853 clp->cl_serverscope = res.server_scope;
6854 goto out;
6855 }
6856 } else
6857 kfree(res.impl_id);
6858
6859out_server_owner:
6860 kfree(res.server_owner);
6861out_server_scope:
6862 kfree(res.server_scope);
6863out:
6864 if (clp->cl_implid != NULL)
6865 dprintk("NFS reply exchange_id: Server Implementation ID: "
6866 "domain: %s, name: %s, date: %llu,%u\n",
6867 clp->cl_implid->domain, clp->cl_implid->name,
6868 clp->cl_implid->date.seconds,
6869 clp->cl_implid->date.nseconds);
6870 dprintk("NFS reply exchange_id: %d\n", status);
6871 return status;
6872}
6873
6874/*
6875 * nfs4_proc_exchange_id()
6876 *
6877 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6878 *
6879 * Since the clientid has expired, all compounds using sessions
6880 * associated with the stale clientid will be returning
6881 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6882 * be in some phase of session reset.
6883 *
6884 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6885 */
6886int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6887{
6888 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6889 int status;
6890
6891 /* try SP4_MACH_CRED if krb5i/p */
6892 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6893 authflavor == RPC_AUTH_GSS_KRB5P) {
6894 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6895 if (!status)
6896 return 0;
6897 }
6898
6899 /* try SP4_NONE */
6900 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6901}
6902
6903static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6904 struct rpc_cred *cred)
6905{
6906 struct rpc_message msg = {
6907 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6908 .rpc_argp = clp,
6909 .rpc_cred = cred,
6910 };
6911 int status;
6912
6913 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6914 trace_nfs4_destroy_clientid(clp, status);
6915 if (status)
6916 dprintk("NFS: Got error %d from the server %s on "
6917 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6918 return status;
6919}
6920
6921static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6922 struct rpc_cred *cred)
6923{
6924 unsigned int loop;
6925 int ret;
6926
6927 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6928 ret = _nfs4_proc_destroy_clientid(clp, cred);
6929 switch (ret) {
6930 case -NFS4ERR_DELAY:
6931 case -NFS4ERR_CLIENTID_BUSY:
6932 ssleep(1);
6933 break;
6934 default:
6935 return ret;
6936 }
6937 }
6938 return 0;
6939}
6940
6941int nfs4_destroy_clientid(struct nfs_client *clp)
6942{
6943 struct rpc_cred *cred;
6944 int ret = 0;
6945
6946 if (clp->cl_mvops->minor_version < 1)
6947 goto out;
6948 if (clp->cl_exchange_flags == 0)
6949 goto out;
6950 if (clp->cl_preserve_clid)
6951 goto out;
6952 cred = nfs4_get_clid_cred(clp);
6953 ret = nfs4_proc_destroy_clientid(clp, cred);
6954 if (cred)
6955 put_rpccred(cred);
6956 switch (ret) {
6957 case 0:
6958 case -NFS4ERR_STALE_CLIENTID:
6959 clp->cl_exchange_flags = 0;
6960 }
6961out:
6962 return ret;
6963}
6964
6965struct nfs4_get_lease_time_data {
6966 struct nfs4_get_lease_time_args *args;
6967 struct nfs4_get_lease_time_res *res;
6968 struct nfs_client *clp;
6969};
6970
6971static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6972 void *calldata)
6973{
6974 struct nfs4_get_lease_time_data *data =
6975 (struct nfs4_get_lease_time_data *)calldata;
6976
6977 dprintk("--> %s\n", __func__);
6978 /* just setup sequence, do not trigger session recovery
6979 since we're invoked within one */
6980 nfs41_setup_sequence(data->clp->cl_session,
6981 &data->args->la_seq_args,
6982 &data->res->lr_seq_res,
6983 task);
6984 dprintk("<-- %s\n", __func__);
6985}
6986
6987/*
6988 * Called from nfs4_state_manager thread for session setup, so don't recover
6989 * from sequence operation or clientid errors.
6990 */
6991static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6992{
6993 struct nfs4_get_lease_time_data *data =
6994 (struct nfs4_get_lease_time_data *)calldata;
6995
6996 dprintk("--> %s\n", __func__);
6997 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6998 return;
6999 switch (task->tk_status) {
7000 case -NFS4ERR_DELAY:
7001 case -NFS4ERR_GRACE:
7002 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7003 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7004 task->tk_status = 0;
7005 /* fall through */
7006 case -NFS4ERR_RETRY_UNCACHED_REP:
7007 rpc_restart_call_prepare(task);
7008 return;
7009 }
7010 dprintk("<-- %s\n", __func__);
7011}
7012
7013static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7014 .rpc_call_prepare = nfs4_get_lease_time_prepare,
7015 .rpc_call_done = nfs4_get_lease_time_done,
7016};
7017
7018int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7019{
7020 struct rpc_task *task;
7021 struct nfs4_get_lease_time_args args;
7022 struct nfs4_get_lease_time_res res = {
7023 .lr_fsinfo = fsinfo,
7024 };
7025 struct nfs4_get_lease_time_data data = {
7026 .args = &args,
7027 .res = &res,
7028 .clp = clp,
7029 };
7030 struct rpc_message msg = {
7031 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7032 .rpc_argp = &args,
7033 .rpc_resp = &res,
7034 };
7035 struct rpc_task_setup task_setup = {
7036 .rpc_client = clp->cl_rpcclient,
7037 .rpc_message = &msg,
7038 .callback_ops = &nfs4_get_lease_time_ops,
7039 .callback_data = &data,
7040 .flags = RPC_TASK_TIMEOUT,
7041 };
7042 int status;
7043
7044 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7045 nfs4_set_sequence_privileged(&args.la_seq_args);
7046 dprintk("--> %s\n", __func__);
7047 task = rpc_run_task(&task_setup);
7048
7049 if (IS_ERR(task))
7050 status = PTR_ERR(task);
7051 else {
7052 status = task->tk_status;
7053 rpc_put_task(task);
7054 }
7055 dprintk("<-- %s return %d\n", __func__, status);
7056
7057 return status;
7058}
7059
7060/*
7061 * Initialize the values to be used by the client in CREATE_SESSION
7062 * If nfs4_init_session set the fore channel request and response sizes,
7063 * use them.
7064 *
7065 * Set the back channel max_resp_sz_cached to zero to force the client to
7066 * always set csa_cachethis to FALSE because the current implementation
7067 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7068 */
7069static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7070{
7071 unsigned int max_rqst_sz, max_resp_sz;
7072
7073 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7074 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7075
7076 /* Fore channel attributes */
7077 args->fc_attrs.max_rqst_sz = max_rqst_sz;
7078 args->fc_attrs.max_resp_sz = max_resp_sz;
7079 args->fc_attrs.max_ops = NFS4_MAX_OPS;
7080 args->fc_attrs.max_reqs = max_session_slots;
7081
7082 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7083 "max_ops=%u max_reqs=%u\n",
7084 __func__,
7085 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7086 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7087
7088 /* Back channel attributes */
7089 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7090 args->bc_attrs.max_resp_sz = PAGE_SIZE;
7091 args->bc_attrs.max_resp_sz_cached = 0;
7092 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7093 args->bc_attrs.max_reqs = 1;
7094
7095 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7096 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7097 __func__,
7098 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7099 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7100 args->bc_attrs.max_reqs);
7101}
7102
7103static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7104{
7105 struct nfs4_channel_attrs *sent = &args->fc_attrs;
7106 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7107
7108 if (rcvd->max_resp_sz > sent->max_resp_sz)
7109 return -EINVAL;
7110 /*
7111 * Our requested max_ops is the minimum we need; we're not
7112 * prepared to break up compounds into smaller pieces than that.
7113 * So, no point even trying to continue if the server won't
7114 * cooperate:
7115 */
7116 if (rcvd->max_ops < sent->max_ops)
7117 return -EINVAL;
7118 if (rcvd->max_reqs == 0)
7119 return -EINVAL;
7120 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7121 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7122 return 0;
7123}
7124
7125static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7126{
7127 struct nfs4_channel_attrs *sent = &args->bc_attrs;
7128 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7129
7130 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7131 return -EINVAL;
7132 if (rcvd->max_resp_sz < sent->max_resp_sz)
7133 return -EINVAL;
7134 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7135 return -EINVAL;
7136 /* These would render the backchannel useless: */
7137 if (rcvd->max_ops != sent->max_ops)
7138 return -EINVAL;
7139 if (rcvd->max_reqs != sent->max_reqs)
7140 return -EINVAL;
7141 return 0;
7142}
7143
7144static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7145 struct nfs4_session *session)
7146{
7147 int ret;
7148
7149 ret = nfs4_verify_fore_channel_attrs(args, session);
7150 if (ret)
7151 return ret;
7152 return nfs4_verify_back_channel_attrs(args, session);
7153}
7154
7155static int _nfs4_proc_create_session(struct nfs_client *clp,
7156 struct rpc_cred *cred)
7157{
7158 struct nfs4_session *session = clp->cl_session;
7159 struct nfs41_create_session_args args = {
7160 .client = clp,
7161 .cb_program = NFS4_CALLBACK,
7162 };
7163 struct nfs41_create_session_res res = {
7164 .client = clp,
7165 };
7166 struct rpc_message msg = {
7167 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7168 .rpc_argp = &args,
7169 .rpc_resp = &res,
7170 .rpc_cred = cred,
7171 };
7172 int status;
7173
7174 nfs4_init_channel_attrs(&args);
7175 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7176
7177 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7178 trace_nfs4_create_session(clp, status);
7179
7180 if (!status) {
7181 /* Verify the session's negotiated channel_attrs values */
7182 status = nfs4_verify_channel_attrs(&args, session);
7183 /* Increment the clientid slot sequence id */
7184 clp->cl_seqid++;
7185 }
7186
7187 return status;
7188}
7189
7190/*
7191 * Issues a CREATE_SESSION operation to the server.
7192 * It is the responsibility of the caller to verify the session is
7193 * expired before calling this routine.
7194 */
7195int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7196{
7197 int status;
7198 unsigned *ptr;
7199 struct nfs4_session *session = clp->cl_session;
7200
7201 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7202
7203 status = _nfs4_proc_create_session(clp, cred);
7204 if (status)
7205 goto out;
7206
7207 /* Init or reset the session slot tables */
7208 status = nfs4_setup_session_slot_tables(session);
7209 dprintk("slot table setup returned %d\n", status);
7210 if (status)
7211 goto out;
7212
7213 ptr = (unsigned *)&session->sess_id.data[0];
7214 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7215 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7216out:
7217 dprintk("<-- %s\n", __func__);
7218 return status;
7219}
7220
7221/*
7222 * Issue the over-the-wire RPC DESTROY_SESSION.
7223 * The caller must serialize access to this routine.
7224 */
7225int nfs4_proc_destroy_session(struct nfs4_session *session,
7226 struct rpc_cred *cred)
7227{
7228 struct rpc_message msg = {
7229 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7230 .rpc_argp = session,
7231 .rpc_cred = cred,
7232 };
7233 int status = 0;
7234
7235 dprintk("--> nfs4_proc_destroy_session\n");
7236
7237 /* session is still being setup */
7238 if (session->clp->cl_cons_state != NFS_CS_READY)
7239 return status;
7240
7241 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7242 trace_nfs4_destroy_session(session->clp, status);
7243
7244 if (status)
7245 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7246 "Session has been destroyed regardless...\n", status);
7247
7248 dprintk("<-- nfs4_proc_destroy_session\n");
7249 return status;
7250}
7251
7252/*
7253 * Renew the cl_session lease.
7254 */
7255struct nfs4_sequence_data {
7256 struct nfs_client *clp;
7257 struct nfs4_sequence_args args;
7258 struct nfs4_sequence_res res;
7259};
7260
7261static void nfs41_sequence_release(void *data)
7262{
7263 struct nfs4_sequence_data *calldata = data;
7264 struct nfs_client *clp = calldata->clp;
7265
7266 if (atomic_read(&clp->cl_count) > 1)
7267 nfs4_schedule_state_renewal(clp);
7268 nfs_put_client(clp);
7269 kfree(calldata);
7270}
7271
7272static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7273{
7274 switch(task->tk_status) {
7275 case -NFS4ERR_DELAY:
7276 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7277 return -EAGAIN;
7278 default:
7279 nfs4_schedule_lease_recovery(clp);
7280 }
7281 return 0;
7282}
7283
7284static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7285{
7286 struct nfs4_sequence_data *calldata = data;
7287 struct nfs_client *clp = calldata->clp;
7288
7289 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7290 return;
7291
7292 trace_nfs4_sequence(clp, task->tk_status);
7293 if (task->tk_status < 0) {
7294 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7295 if (atomic_read(&clp->cl_count) == 1)
7296 goto out;
7297
7298 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7299 rpc_restart_call_prepare(task);
7300 return;
7301 }
7302 }
7303 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7304out:
7305 dprintk("<-- %s\n", __func__);
7306}
7307
7308static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7309{
7310 struct nfs4_sequence_data *calldata = data;
7311 struct nfs_client *clp = calldata->clp;
7312 struct nfs4_sequence_args *args;
7313 struct nfs4_sequence_res *res;
7314
7315 args = task->tk_msg.rpc_argp;
7316 res = task->tk_msg.rpc_resp;
7317
7318 nfs41_setup_sequence(clp->cl_session, args, res, task);
7319}
7320
7321static const struct rpc_call_ops nfs41_sequence_ops = {
7322 .rpc_call_done = nfs41_sequence_call_done,
7323 .rpc_call_prepare = nfs41_sequence_prepare,
7324 .rpc_release = nfs41_sequence_release,
7325};
7326
7327static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7328 struct rpc_cred *cred,
7329 bool is_privileged)
7330{
7331 struct nfs4_sequence_data *calldata;
7332 struct rpc_message msg = {
7333 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7334 .rpc_cred = cred,
7335 };
7336 struct rpc_task_setup task_setup_data = {
7337 .rpc_client = clp->cl_rpcclient,
7338 .rpc_message = &msg,
7339 .callback_ops = &nfs41_sequence_ops,
7340 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7341 };
7342
7343 if (!atomic_inc_not_zero(&clp->cl_count))
7344 return ERR_PTR(-EIO);
7345 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7346 if (calldata == NULL) {
7347 nfs_put_client(clp);
7348 return ERR_PTR(-ENOMEM);
7349 }
7350 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7351 if (is_privileged)
7352 nfs4_set_sequence_privileged(&calldata->args);
7353 msg.rpc_argp = &calldata->args;
7354 msg.rpc_resp = &calldata->res;
7355 calldata->clp = clp;
7356 task_setup_data.callback_data = calldata;
7357
7358 return rpc_run_task(&task_setup_data);
7359}
7360
7361static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7362{
7363 struct rpc_task *task;
7364 int ret = 0;
7365
7366 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7367 return -EAGAIN;
7368 task = _nfs41_proc_sequence(clp, cred, false);
7369 if (IS_ERR(task))
7370 ret = PTR_ERR(task);
7371 else
7372 rpc_put_task_async(task);
7373 dprintk("<-- %s status=%d\n", __func__, ret);
7374 return ret;
7375}
7376
7377static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7378{
7379 struct rpc_task *task;
7380 int ret;
7381
7382 task = _nfs41_proc_sequence(clp, cred, true);
7383 if (IS_ERR(task)) {
7384 ret = PTR_ERR(task);
7385 goto out;
7386 }
7387 ret = rpc_wait_for_completion_task(task);
7388 if (!ret) {
7389 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7390
7391 if (task->tk_status == 0)
7392 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7393 ret = task->tk_status;
7394 }
7395 rpc_put_task(task);
7396out:
7397 dprintk("<-- %s status=%d\n", __func__, ret);
7398 return ret;
7399}
7400
7401struct nfs4_reclaim_complete_data {
7402 struct nfs_client *clp;
7403 struct nfs41_reclaim_complete_args arg;
7404 struct nfs41_reclaim_complete_res res;
7405};
7406
7407static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7408{
7409 struct nfs4_reclaim_complete_data *calldata = data;
7410
7411 nfs41_setup_sequence(calldata->clp->cl_session,
7412 &calldata->arg.seq_args,
7413 &calldata->res.seq_res,
7414 task);
7415}
7416
7417static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7418{
7419 switch(task->tk_status) {
7420 case 0:
7421 case -NFS4ERR_COMPLETE_ALREADY:
7422 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7423 break;
7424 case -NFS4ERR_DELAY:
7425 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7426 /* fall through */
7427 case -NFS4ERR_RETRY_UNCACHED_REP:
7428 return -EAGAIN;
7429 default:
7430 nfs4_schedule_lease_recovery(clp);
7431 }
7432 return 0;
7433}
7434
7435static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7436{
7437 struct nfs4_reclaim_complete_data *calldata = data;
7438 struct nfs_client *clp = calldata->clp;
7439 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7440
7441 dprintk("--> %s\n", __func__);
7442 if (!nfs41_sequence_done(task, res))
7443 return;
7444
7445 trace_nfs4_reclaim_complete(clp, task->tk_status);
7446 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7447 rpc_restart_call_prepare(task);
7448 return;
7449 }
7450 dprintk("<-- %s\n", __func__);
7451}
7452
7453static void nfs4_free_reclaim_complete_data(void *data)
7454{
7455 struct nfs4_reclaim_complete_data *calldata = data;
7456
7457 kfree(calldata);
7458}
7459
7460static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7461 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7462 .rpc_call_done = nfs4_reclaim_complete_done,
7463 .rpc_release = nfs4_free_reclaim_complete_data,
7464};
7465
7466/*
7467 * Issue a global reclaim complete.
7468 */
7469static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7470 struct rpc_cred *cred)
7471{
7472 struct nfs4_reclaim_complete_data *calldata;
7473 struct rpc_task *task;
7474 struct rpc_message msg = {
7475 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7476 .rpc_cred = cred,
7477 };
7478 struct rpc_task_setup task_setup_data = {
7479 .rpc_client = clp->cl_rpcclient,
7480 .rpc_message = &msg,
7481 .callback_ops = &nfs4_reclaim_complete_call_ops,
7482 .flags = RPC_TASK_ASYNC,
7483 };
7484 int status = -ENOMEM;
7485
7486 dprintk("--> %s\n", __func__);
7487 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7488 if (calldata == NULL)
7489 goto out;
7490 calldata->clp = clp;
7491 calldata->arg.one_fs = 0;
7492
7493 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7494 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7495 msg.rpc_argp = &calldata->arg;
7496 msg.rpc_resp = &calldata->res;
7497 task_setup_data.callback_data = calldata;
7498 task = rpc_run_task(&task_setup_data);
7499 if (IS_ERR(task)) {
7500 status = PTR_ERR(task);
7501 goto out;
7502 }
7503 status = nfs4_wait_for_completion_rpc_task(task);
7504 if (status == 0)
7505 status = task->tk_status;
7506 rpc_put_task(task);
7507 return 0;
7508out:
7509 dprintk("<-- %s status=%d\n", __func__, status);
7510 return status;
7511}
7512
7513static void
7514nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7515{
7516 struct nfs4_layoutget *lgp = calldata;
7517 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7518 struct nfs4_session *session = nfs4_get_session(server);
7519
7520 dprintk("--> %s\n", __func__);
7521 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7522 * right now covering the LAYOUTGET we are about to send.
7523 * However, that is not so catastrophic, and there seems
7524 * to be no way to prevent it completely.
7525 */
7526 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7527 &lgp->res.seq_res, task))
7528 return;
7529 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7530 NFS_I(lgp->args.inode)->layout,
7531 lgp->args.ctx->state)) {
7532 rpc_exit(task, NFS4_OK);
7533 }
7534}
7535
7536static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7537{
7538 struct nfs4_layoutget *lgp = calldata;
7539 struct inode *inode = lgp->args.inode;
7540 struct nfs_server *server = NFS_SERVER(inode);
7541 struct pnfs_layout_hdr *lo;
7542 struct nfs4_state *state = NULL;
7543 unsigned long timeo, now, giveup;
7544
7545 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7546
7547 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7548 goto out;
7549
7550 switch (task->tk_status) {
7551 case 0:
7552 goto out;
7553 /*
7554 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7555 * (or clients) writing to the same RAID stripe
7556 */
7557 case -NFS4ERR_LAYOUTTRYLATER:
7558 /*
7559 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7560 * existing layout before getting a new one).
7561 */
7562 case -NFS4ERR_RECALLCONFLICT:
7563 timeo = rpc_get_timeout(task->tk_client);
7564 giveup = lgp->args.timestamp + timeo;
7565 now = jiffies;
7566 if (time_after(giveup, now)) {
7567 unsigned long delay;
7568
7569 /* Delay for:
7570 * - Not less then NFS4_POLL_RETRY_MIN.
7571 * - One last time a jiffie before we give up
7572 * - exponential backoff (time_now minus start_attempt)
7573 */
7574 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7575 min((giveup - now - 1),
7576 now - lgp->args.timestamp));
7577
7578 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7579 __func__, delay);
7580 rpc_delay(task, delay);
7581 task->tk_status = 0;
7582 rpc_restart_call_prepare(task);
7583 goto out; /* Do not call nfs4_async_handle_error() */
7584 }
7585 break;
7586 case -NFS4ERR_EXPIRED:
7587 case -NFS4ERR_BAD_STATEID:
7588 spin_lock(&inode->i_lock);
7589 lo = NFS_I(inode)->layout;
7590 if (!lo || list_empty(&lo->plh_segs)) {
7591 spin_unlock(&inode->i_lock);
7592 /* If the open stateid was bad, then recover it. */
7593 state = lgp->args.ctx->state;
7594 } else {
7595 LIST_HEAD(head);
7596
7597 /*
7598 * Mark the bad layout state as invalid, then retry
7599 * with the current stateid.
7600 */
7601 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7602 spin_unlock(&inode->i_lock);
7603 pnfs_free_lseg_list(&head);
7604
7605 task->tk_status = 0;
7606 rpc_restart_call_prepare(task);
7607 }
7608 }
7609 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7610 rpc_restart_call_prepare(task);
7611out:
7612 dprintk("<-- %s\n", __func__);
7613}
7614
7615static size_t max_response_pages(struct nfs_server *server)
7616{
7617 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7618 return nfs_page_array_len(0, max_resp_sz);
7619}
7620
7621static void nfs4_free_pages(struct page **pages, size_t size)
7622{
7623 int i;
7624
7625 if (!pages)
7626 return;
7627
7628 for (i = 0; i < size; i++) {
7629 if (!pages[i])
7630 break;
7631 __free_page(pages[i]);
7632 }
7633 kfree(pages);
7634}
7635
7636static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7637{
7638 struct page **pages;
7639 int i;
7640
7641 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7642 if (!pages) {
7643 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7644 return NULL;
7645 }
7646
7647 for (i = 0; i < size; i++) {
7648 pages[i] = alloc_page(gfp_flags);
7649 if (!pages[i]) {
7650 dprintk("%s: failed to allocate page\n", __func__);
7651 nfs4_free_pages(pages, size);
7652 return NULL;
7653 }
7654 }
7655
7656 return pages;
7657}
7658
7659static void nfs4_layoutget_release(void *calldata)
7660{
7661 struct nfs4_layoutget *lgp = calldata;
7662 struct inode *inode = lgp->args.inode;
7663 struct nfs_server *server = NFS_SERVER(inode);
7664 size_t max_pages = max_response_pages(server);
7665
7666 dprintk("--> %s\n", __func__);
7667 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7668 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7669 put_nfs_open_context(lgp->args.ctx);
7670 kfree(calldata);
7671 dprintk("<-- %s\n", __func__);
7672}
7673
7674static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7675 .rpc_call_prepare = nfs4_layoutget_prepare,
7676 .rpc_call_done = nfs4_layoutget_done,
7677 .rpc_release = nfs4_layoutget_release,
7678};
7679
7680struct pnfs_layout_segment *
7681nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7682{
7683 struct inode *inode = lgp->args.inode;
7684 struct nfs_server *server = NFS_SERVER(inode);
7685 size_t max_pages = max_response_pages(server);
7686 struct rpc_task *task;
7687 struct rpc_message msg = {
7688 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7689 .rpc_argp = &lgp->args,
7690 .rpc_resp = &lgp->res,
7691 .rpc_cred = lgp->cred,
7692 };
7693 struct rpc_task_setup task_setup_data = {
7694 .rpc_client = server->client,
7695 .rpc_message = &msg,
7696 .callback_ops = &nfs4_layoutget_call_ops,
7697 .callback_data = lgp,
7698 .flags = RPC_TASK_ASYNC,
7699 };
7700 struct pnfs_layout_segment *lseg = NULL;
7701 int status = 0;
7702
7703 dprintk("--> %s\n", __func__);
7704
7705 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7706 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7707
7708 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7709 if (!lgp->args.layout.pages) {
7710 nfs4_layoutget_release(lgp);
7711 return ERR_PTR(-ENOMEM);
7712 }
7713 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7714 lgp->args.timestamp = jiffies;
7715
7716 lgp->res.layoutp = &lgp->args.layout;
7717 lgp->res.seq_res.sr_slot = NULL;
7718 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7719
7720 task = rpc_run_task(&task_setup_data);
7721 if (IS_ERR(task))
7722 return ERR_CAST(task);
7723 status = nfs4_wait_for_completion_rpc_task(task);
7724 if (status == 0)
7725 status = task->tk_status;
7726 trace_nfs4_layoutget(lgp->args.ctx,
7727 &lgp->args.range,
7728 &lgp->res.range,
7729 status);
7730 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7731 if (status == 0 && lgp->res.layoutp->len)
7732 lseg = pnfs_layout_process(lgp);
7733 rpc_put_task(task);
7734 dprintk("<-- %s status=%d\n", __func__, status);
7735 if (status)
7736 return ERR_PTR(status);
7737 return lseg;
7738}
7739
7740static void
7741nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7742{
7743 struct nfs4_layoutreturn *lrp = calldata;
7744
7745 dprintk("--> %s\n", __func__);
7746 nfs41_setup_sequence(lrp->clp->cl_session,
7747 &lrp->args.seq_args,
7748 &lrp->res.seq_res,
7749 task);
7750}
7751
7752static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7753{
7754 struct nfs4_layoutreturn *lrp = calldata;
7755 struct nfs_server *server;
7756
7757 dprintk("--> %s\n", __func__);
7758
7759 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7760 return;
7761
7762 server = NFS_SERVER(lrp->args.inode);
7763 switch (task->tk_status) {
7764 default:
7765 task->tk_status = 0;
7766 case 0:
7767 break;
7768 case -NFS4ERR_DELAY:
7769 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7770 break;
7771 rpc_restart_call_prepare(task);
7772 return;
7773 }
7774 dprintk("<-- %s\n", __func__);
7775}
7776
7777static void nfs4_layoutreturn_release(void *calldata)
7778{
7779 struct nfs4_layoutreturn *lrp = calldata;
7780 struct pnfs_layout_hdr *lo = lrp->args.layout;
7781
7782 dprintk("--> %s\n", __func__);
7783 spin_lock(&lo->plh_inode->i_lock);
7784 if (lrp->res.lrs_present)
7785 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7786 lo->plh_block_lgets--;
7787 spin_unlock(&lo->plh_inode->i_lock);
7788 pnfs_put_layout_hdr(lrp->args.layout);
7789 kfree(calldata);
7790 dprintk("<-- %s\n", __func__);
7791}
7792
7793static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7794 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7795 .rpc_call_done = nfs4_layoutreturn_done,
7796 .rpc_release = nfs4_layoutreturn_release,
7797};
7798
7799int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7800{
7801 struct rpc_task *task;
7802 struct rpc_message msg = {
7803 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7804 .rpc_argp = &lrp->args,
7805 .rpc_resp = &lrp->res,
7806 .rpc_cred = lrp->cred,
7807 };
7808 struct rpc_task_setup task_setup_data = {
7809 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7810 .rpc_message = &msg,
7811 .callback_ops = &nfs4_layoutreturn_call_ops,
7812 .callback_data = lrp,
7813 };
7814 int status;
7815
7816 dprintk("--> %s\n", __func__);
7817 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7818 task = rpc_run_task(&task_setup_data);
7819 if (IS_ERR(task))
7820 return PTR_ERR(task);
7821 status = task->tk_status;
7822 trace_nfs4_layoutreturn(lrp->args.inode, status);
7823 dprintk("<-- %s status=%d\n", __func__, status);
7824 rpc_put_task(task);
7825 return status;
7826}
7827
7828static int
7829_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7830 struct pnfs_device *pdev,
7831 struct rpc_cred *cred)
7832{
7833 struct nfs4_getdeviceinfo_args args = {
7834 .pdev = pdev,
7835 };
7836 struct nfs4_getdeviceinfo_res res = {
7837 .pdev = pdev,
7838 };
7839 struct rpc_message msg = {
7840 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7841 .rpc_argp = &args,
7842 .rpc_resp = &res,
7843 .rpc_cred = cred,
7844 };
7845 int status;
7846
7847 dprintk("--> %s\n", __func__);
7848 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7849 dprintk("<-- %s status=%d\n", __func__, status);
7850
7851 return status;
7852}
7853
7854int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7855 struct pnfs_device *pdev,
7856 struct rpc_cred *cred)
7857{
7858 struct nfs4_exception exception = { };
7859 int err;
7860
7861 do {
7862 err = nfs4_handle_exception(server,
7863 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7864 &exception);
7865 } while (exception.retry);
7866 return err;
7867}
7868EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7869
7870static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7871{
7872 struct nfs4_layoutcommit_data *data = calldata;
7873 struct nfs_server *server = NFS_SERVER(data->args.inode);
7874 struct nfs4_session *session = nfs4_get_session(server);
7875
7876 nfs41_setup_sequence(session,
7877 &data->args.seq_args,
7878 &data->res.seq_res,
7879 task);
7880}
7881
7882static void
7883nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7884{
7885 struct nfs4_layoutcommit_data *data = calldata;
7886 struct nfs_server *server = NFS_SERVER(data->args.inode);
7887
7888 if (!nfs41_sequence_done(task, &data->res.seq_res))
7889 return;
7890
7891 switch (task->tk_status) { /* Just ignore these failures */
7892 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7893 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7894 case -NFS4ERR_BADLAYOUT: /* no layout */
7895 case -NFS4ERR_GRACE: /* loca_recalim always false */
7896 task->tk_status = 0;
7897 case 0:
7898 break;
7899 default:
7900 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7901 rpc_restart_call_prepare(task);
7902 return;
7903 }
7904 }
7905}
7906
7907static void nfs4_layoutcommit_release(void *calldata)
7908{
7909 struct nfs4_layoutcommit_data *data = calldata;
7910
7911 pnfs_cleanup_layoutcommit(data);
7912 nfs_post_op_update_inode_force_wcc(data->args.inode,
7913 data->res.fattr);
7914 put_rpccred(data->cred);
7915 kfree(data);
7916}
7917
7918static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7919 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7920 .rpc_call_done = nfs4_layoutcommit_done,
7921 .rpc_release = nfs4_layoutcommit_release,
7922};
7923
7924int
7925nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7926{
7927 struct rpc_message msg = {
7928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7929 .rpc_argp = &data->args,
7930 .rpc_resp = &data->res,
7931 .rpc_cred = data->cred,
7932 };
7933 struct rpc_task_setup task_setup_data = {
7934 .task = &data->task,
7935 .rpc_client = NFS_CLIENT(data->args.inode),
7936 .rpc_message = &msg,
7937 .callback_ops = &nfs4_layoutcommit_ops,
7938 .callback_data = data,
7939 .flags = RPC_TASK_ASYNC,
7940 };
7941 struct rpc_task *task;
7942 int status = 0;
7943
7944 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7945 "lbw: %llu inode %lu\n",
7946 data->task.tk_pid, sync,
7947 data->args.lastbytewritten,
7948 data->args.inode->i_ino);
7949
7950 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7951 task = rpc_run_task(&task_setup_data);
7952 if (IS_ERR(task))
7953 return PTR_ERR(task);
7954 if (sync == false)
7955 goto out;
7956 status = nfs4_wait_for_completion_rpc_task(task);
7957 if (status != 0)
7958 goto out;
7959 status = task->tk_status;
7960 trace_nfs4_layoutcommit(data->args.inode, status);
7961out:
7962 dprintk("%s: status %d\n", __func__, status);
7963 rpc_put_task(task);
7964 return status;
7965}
7966
7967/**
7968 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7969 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7970 */
7971static int
7972_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7973 struct nfs_fsinfo *info,
7974 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7975{
7976 struct nfs41_secinfo_no_name_args args = {
7977 .style = SECINFO_STYLE_CURRENT_FH,
7978 };
7979 struct nfs4_secinfo_res res = {
7980 .flavors = flavors,
7981 };
7982 struct rpc_message msg = {
7983 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7984 .rpc_argp = &args,
7985 .rpc_resp = &res,
7986 };
7987 struct rpc_clnt *clnt = server->client;
7988 struct rpc_cred *cred = NULL;
7989 int status;
7990
7991 if (use_integrity) {
7992 clnt = server->nfs_client->cl_rpcclient;
7993 cred = nfs4_get_clid_cred(server->nfs_client);
7994 msg.rpc_cred = cred;
7995 }
7996
7997 dprintk("--> %s\n", __func__);
7998 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7999 &res.seq_res, 0);
8000 dprintk("<-- %s status=%d\n", __func__, status);
8001
8002 if (cred)
8003 put_rpccred(cred);
8004
8005 return status;
8006}
8007
8008static int
8009nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8010 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8011{
8012 struct nfs4_exception exception = { };
8013 int err;
8014 do {
8015 /* first try using integrity protection */
8016 err = -NFS4ERR_WRONGSEC;
8017
8018 /* try to use integrity protection with machine cred */
8019 if (_nfs4_is_integrity_protected(server->nfs_client))
8020 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8021 flavors, true);
8022
8023 /*
8024 * if unable to use integrity protection, or SECINFO with
8025 * integrity protection returns NFS4ERR_WRONGSEC (which is
8026 * disallowed by spec, but exists in deployed servers) use
8027 * the current filesystem's rpc_client and the user cred.
8028 */
8029 if (err == -NFS4ERR_WRONGSEC)
8030 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8031 flavors, false);
8032
8033 switch (err) {
8034 case 0:
8035 case -NFS4ERR_WRONGSEC:
8036 case -ENOTSUPP:
8037 goto out;
8038 default:
8039 err = nfs4_handle_exception(server, err, &exception);
8040 }
8041 } while (exception.retry);
8042out:
8043 return err;
8044}
8045
8046static int
8047nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8048 struct nfs_fsinfo *info)
8049{
8050 int err;
8051 struct page *page;
8052 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8053 struct nfs4_secinfo_flavors *flavors;
8054 struct nfs4_secinfo4 *secinfo;
8055 int i;
8056
8057 page = alloc_page(GFP_KERNEL);
8058 if (!page) {
8059 err = -ENOMEM;
8060 goto out;
8061 }
8062
8063 flavors = page_address(page);
8064 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8065
8066 /*
8067 * Fall back on "guess and check" method if
8068 * the server doesn't support SECINFO_NO_NAME
8069 */
8070 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8071 err = nfs4_find_root_sec(server, fhandle, info);
8072 goto out_freepage;
8073 }
8074 if (err)
8075 goto out_freepage;
8076
8077 for (i = 0; i < flavors->num_flavors; i++) {
8078 secinfo = &flavors->flavors[i];
8079
8080 switch (secinfo->flavor) {
8081 case RPC_AUTH_NULL:
8082 case RPC_AUTH_UNIX:
8083 case RPC_AUTH_GSS:
8084 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8085 &secinfo->flavor_info);
8086 break;
8087 default:
8088 flavor = RPC_AUTH_MAXFLAVOR;
8089 break;
8090 }
8091
8092 if (!nfs_auth_info_match(&server->auth_info, flavor))
8093 flavor = RPC_AUTH_MAXFLAVOR;
8094
8095 if (flavor != RPC_AUTH_MAXFLAVOR) {
8096 err = nfs4_lookup_root_sec(server, fhandle,
8097 info, flavor);
8098 if (!err)
8099 break;
8100 }
8101 }
8102
8103 if (flavor == RPC_AUTH_MAXFLAVOR)
8104 err = -EPERM;
8105
8106out_freepage:
8107 put_page(page);
8108 if (err == -EACCES)
8109 return -EPERM;
8110out:
8111 return err;
8112}
8113
8114static int _nfs41_test_stateid(struct nfs_server *server,
8115 nfs4_stateid *stateid,
8116 struct rpc_cred *cred)
8117{
8118 int status;
8119 struct nfs41_test_stateid_args args = {
8120 .stateid = stateid,
8121 };
8122 struct nfs41_test_stateid_res res;
8123 struct rpc_message msg = {
8124 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8125 .rpc_argp = &args,
8126 .rpc_resp = &res,
8127 .rpc_cred = cred,
8128 };
8129 struct rpc_clnt *rpc_client = server->client;
8130
8131 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8132 &rpc_client, &msg);
8133
8134 dprintk("NFS call test_stateid %p\n", stateid);
8135 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8136 nfs4_set_sequence_privileged(&args.seq_args);
8137 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8138 &args.seq_args, &res.seq_res);
8139 if (status != NFS_OK) {
8140 dprintk("NFS reply test_stateid: failed, %d\n", status);
8141 return status;
8142 }
8143 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8144 return -res.status;
8145}
8146
8147/**
8148 * nfs41_test_stateid - perform a TEST_STATEID operation
8149 *
8150 * @server: server / transport on which to perform the operation
8151 * @stateid: state ID to test
8152 * @cred: credential
8153 *
8154 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8155 * Otherwise a negative NFS4ERR value is returned if the operation
8156 * failed or the state ID is not currently valid.
8157 */
8158static int nfs41_test_stateid(struct nfs_server *server,
8159 nfs4_stateid *stateid,
8160 struct rpc_cred *cred)
8161{
8162 struct nfs4_exception exception = { };
8163 int err;
8164 do {
8165 err = _nfs41_test_stateid(server, stateid, cred);
8166 if (err != -NFS4ERR_DELAY)
8167 break;
8168 nfs4_handle_exception(server, err, &exception);
8169 } while (exception.retry);
8170 return err;
8171}
8172
8173struct nfs_free_stateid_data {
8174 struct nfs_server *server;
8175 struct nfs41_free_stateid_args args;
8176 struct nfs41_free_stateid_res res;
8177};
8178
8179static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8180{
8181 struct nfs_free_stateid_data *data = calldata;
8182 nfs41_setup_sequence(nfs4_get_session(data->server),
8183 &data->args.seq_args,
8184 &data->res.seq_res,
8185 task);
8186}
8187
8188static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8189{
8190 struct nfs_free_stateid_data *data = calldata;
8191
8192 nfs41_sequence_done(task, &data->res.seq_res);
8193
8194 switch (task->tk_status) {
8195 case -NFS4ERR_DELAY:
8196 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8197 rpc_restart_call_prepare(task);
8198 }
8199}
8200
8201static void nfs41_free_stateid_release(void *calldata)
8202{
8203 kfree(calldata);
8204}
8205
8206static const struct rpc_call_ops nfs41_free_stateid_ops = {
8207 .rpc_call_prepare = nfs41_free_stateid_prepare,
8208 .rpc_call_done = nfs41_free_stateid_done,
8209 .rpc_release = nfs41_free_stateid_release,
8210};
8211
8212static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8213 nfs4_stateid *stateid,
8214 struct rpc_cred *cred,
8215 bool privileged)
8216{
8217 struct rpc_message msg = {
8218 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8219 .rpc_cred = cred,
8220 };
8221 struct rpc_task_setup task_setup = {
8222 .rpc_client = server->client,
8223 .rpc_message = &msg,
8224 .callback_ops = &nfs41_free_stateid_ops,
8225 .flags = RPC_TASK_ASYNC,
8226 };
8227 struct nfs_free_stateid_data *data;
8228
8229 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8230 &task_setup.rpc_client, &msg);
8231
8232 dprintk("NFS call free_stateid %p\n", stateid);
8233 data = kmalloc(sizeof(*data), GFP_NOFS);
8234 if (!data)
8235 return ERR_PTR(-ENOMEM);
8236 data->server = server;
8237 nfs4_stateid_copy(&data->args.stateid, stateid);
8238
8239 task_setup.callback_data = data;
8240
8241 msg.rpc_argp = &data->args;
8242 msg.rpc_resp = &data->res;
8243 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8244 if (privileged)
8245 nfs4_set_sequence_privileged(&data->args.seq_args);
8246
8247 return rpc_run_task(&task_setup);
8248}
8249
8250/**
8251 * nfs41_free_stateid - perform a FREE_STATEID operation
8252 *
8253 * @server: server / transport on which to perform the operation
8254 * @stateid: state ID to release
8255 * @cred: credential
8256 *
8257 * Returns NFS_OK if the server freed "stateid". Otherwise a
8258 * negative NFS4ERR value is returned.
8259 */
8260static int nfs41_free_stateid(struct nfs_server *server,
8261 nfs4_stateid *stateid,
8262 struct rpc_cred *cred)
8263{
8264 struct rpc_task *task;
8265 int ret;
8266
8267 task = _nfs41_free_stateid(server, stateid, cred, true);
8268 if (IS_ERR(task))
8269 return PTR_ERR(task);
8270 ret = rpc_wait_for_completion_task(task);
8271 if (!ret)
8272 ret = task->tk_status;
8273 rpc_put_task(task);
8274 return ret;
8275}
8276
8277static void
8278nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8279{
8280 struct rpc_task *task;
8281 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8282
8283 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8284 nfs4_free_lock_state(server, lsp);
8285 if (IS_ERR(task))
8286 return;
8287 rpc_put_task(task);
8288}
8289
8290static bool nfs41_match_stateid(const nfs4_stateid *s1,
8291 const nfs4_stateid *s2)
8292{
8293 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8294 return false;
8295
8296 if (s1->seqid == s2->seqid)
8297 return true;
8298 if (s1->seqid == 0 || s2->seqid == 0)
8299 return true;
8300
8301 return false;
8302}
8303
8304#endif /* CONFIG_NFS_V4_1 */
8305
8306static bool nfs4_match_stateid(const nfs4_stateid *s1,
8307 const nfs4_stateid *s2)
8308{
8309 return nfs4_stateid_match(s1, s2);
8310}
8311
8312
8313static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8314 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8315 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8316 .recover_open = nfs4_open_reclaim,
8317 .recover_lock = nfs4_lock_reclaim,
8318 .establish_clid = nfs4_init_clientid,
8319 .detect_trunking = nfs40_discover_server_trunking,
8320};
8321
8322#if defined(CONFIG_NFS_V4_1)
8323static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8324 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8325 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8326 .recover_open = nfs4_open_reclaim,
8327 .recover_lock = nfs4_lock_reclaim,
8328 .establish_clid = nfs41_init_clientid,
8329 .reclaim_complete = nfs41_proc_reclaim_complete,
8330 .detect_trunking = nfs41_discover_server_trunking,
8331};
8332#endif /* CONFIG_NFS_V4_1 */
8333
8334static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8335 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8336 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8337 .recover_open = nfs40_open_expired,
8338 .recover_lock = nfs4_lock_expired,
8339 .establish_clid = nfs4_init_clientid,
8340};
8341
8342#if defined(CONFIG_NFS_V4_1)
8343static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8344 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8345 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8346 .recover_open = nfs41_open_expired,
8347 .recover_lock = nfs41_lock_expired,
8348 .establish_clid = nfs41_init_clientid,
8349};
8350#endif /* CONFIG_NFS_V4_1 */
8351
8352static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8353 .sched_state_renewal = nfs4_proc_async_renew,
8354 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8355 .renew_lease = nfs4_proc_renew,
8356};
8357
8358#if defined(CONFIG_NFS_V4_1)
8359static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8360 .sched_state_renewal = nfs41_proc_async_sequence,
8361 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8362 .renew_lease = nfs4_proc_sequence,
8363};
8364#endif
8365
8366static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8367 .get_locations = _nfs40_proc_get_locations,
8368 .fsid_present = _nfs40_proc_fsid_present,
8369};
8370
8371#if defined(CONFIG_NFS_V4_1)
8372static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8373 .get_locations = _nfs41_proc_get_locations,
8374 .fsid_present = _nfs41_proc_fsid_present,
8375};
8376#endif /* CONFIG_NFS_V4_1 */
8377
8378static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8379 .minor_version = 0,
8380 .init_caps = NFS_CAP_READDIRPLUS
8381 | NFS_CAP_ATOMIC_OPEN
8382 | NFS_CAP_CHANGE_ATTR
8383 | NFS_CAP_POSIX_LOCK,
8384 .init_client = nfs40_init_client,
8385 .shutdown_client = nfs40_shutdown_client,
8386 .match_stateid = nfs4_match_stateid,
8387 .find_root_sec = nfs4_find_root_sec,
8388 .free_lock_state = nfs4_release_lockowner,
8389 .call_sync_ops = &nfs40_call_sync_ops,
8390 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8391 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8392 .state_renewal_ops = &nfs40_state_renewal_ops,
8393 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8394};
8395
8396#if defined(CONFIG_NFS_V4_1)
8397static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8398 .minor_version = 1,
8399 .init_caps = NFS_CAP_READDIRPLUS
8400 | NFS_CAP_ATOMIC_OPEN
8401 | NFS_CAP_CHANGE_ATTR
8402 | NFS_CAP_POSIX_LOCK
8403 | NFS_CAP_STATEID_NFSV41
8404 | NFS_CAP_ATOMIC_OPEN_V1,
8405 .init_client = nfs41_init_client,
8406 .shutdown_client = nfs41_shutdown_client,
8407 .match_stateid = nfs41_match_stateid,
8408 .find_root_sec = nfs41_find_root_sec,
8409 .free_lock_state = nfs41_free_lock_state,
8410 .call_sync_ops = &nfs41_call_sync_ops,
8411 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8412 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8413 .state_renewal_ops = &nfs41_state_renewal_ops,
8414 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8415};
8416#endif
8417
8418#if defined(CONFIG_NFS_V4_2)
8419static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8420 .minor_version = 2,
8421 .init_caps = NFS_CAP_READDIRPLUS
8422 | NFS_CAP_ATOMIC_OPEN
8423 | NFS_CAP_CHANGE_ATTR
8424 | NFS_CAP_POSIX_LOCK
8425 | NFS_CAP_STATEID_NFSV41
8426 | NFS_CAP_ATOMIC_OPEN_V1
8427 | NFS_CAP_ALLOCATE
8428 | NFS_CAP_SEEK,
8429 .init_client = nfs41_init_client,
8430 .shutdown_client = nfs41_shutdown_client,
8431 .match_stateid = nfs41_match_stateid,
8432 .find_root_sec = nfs41_find_root_sec,
8433 .free_lock_state = nfs41_free_lock_state,
8434 .call_sync_ops = &nfs41_call_sync_ops,
8435 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8436 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8437 .state_renewal_ops = &nfs41_state_renewal_ops,
8438};
8439#endif
8440
8441const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8442 [0] = &nfs_v4_0_minor_ops,
8443#if defined(CONFIG_NFS_V4_1)
8444 [1] = &nfs_v4_1_minor_ops,
8445#endif
8446#if defined(CONFIG_NFS_V4_2)
8447 [2] = &nfs_v4_2_minor_ops,
8448#endif
8449};
8450
8451static const struct inode_operations nfs4_dir_inode_operations = {
8452 .create = nfs_create,
8453 .lookup = nfs_lookup,
8454 .atomic_open = nfs_atomic_open,
8455 .link = nfs_link,
8456 .unlink = nfs_unlink,
8457 .symlink = nfs_symlink,
8458 .mkdir = nfs_mkdir,
8459 .rmdir = nfs_rmdir,
8460 .mknod = nfs_mknod,
8461 .rename = nfs_rename,
8462 .permission = nfs_permission,
8463 .getattr = nfs_getattr,
8464 .setattr = nfs_setattr,
8465 .getxattr = generic_getxattr,
8466 .setxattr = generic_setxattr,
8467 .listxattr = generic_listxattr,
8468 .removexattr = generic_removexattr,
8469};
8470
8471static const struct inode_operations nfs4_file_inode_operations = {
8472 .permission = nfs_permission,
8473 .getattr = nfs_getattr,
8474 .setattr = nfs_setattr,
8475 .getxattr = generic_getxattr,
8476 .setxattr = generic_setxattr,
8477 .listxattr = generic_listxattr,
8478 .removexattr = generic_removexattr,
8479};
8480
8481const struct nfs_rpc_ops nfs_v4_clientops = {
8482 .version = 4, /* protocol version */
8483 .dentry_ops = &nfs4_dentry_operations,
8484 .dir_inode_ops = &nfs4_dir_inode_operations,
8485 .file_inode_ops = &nfs4_file_inode_operations,
8486 .file_ops = &nfs4_file_operations,
8487 .getroot = nfs4_proc_get_root,
8488 .submount = nfs4_submount,
8489 .try_mount = nfs4_try_mount,
8490 .getattr = nfs4_proc_getattr,
8491 .setattr = nfs4_proc_setattr,
8492 .lookup = nfs4_proc_lookup,
8493 .access = nfs4_proc_access,
8494 .readlink = nfs4_proc_readlink,
8495 .create = nfs4_proc_create,
8496 .remove = nfs4_proc_remove,
8497 .unlink_setup = nfs4_proc_unlink_setup,
8498 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8499 .unlink_done = nfs4_proc_unlink_done,
8500 .rename_setup = nfs4_proc_rename_setup,
8501 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8502 .rename_done = nfs4_proc_rename_done,
8503 .link = nfs4_proc_link,
8504 .symlink = nfs4_proc_symlink,
8505 .mkdir = nfs4_proc_mkdir,
8506 .rmdir = nfs4_proc_remove,
8507 .readdir = nfs4_proc_readdir,
8508 .mknod = nfs4_proc_mknod,
8509 .statfs = nfs4_proc_statfs,
8510 .fsinfo = nfs4_proc_fsinfo,
8511 .pathconf = nfs4_proc_pathconf,
8512 .set_capabilities = nfs4_server_capabilities,
8513 .decode_dirent = nfs4_decode_dirent,
8514 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8515 .read_setup = nfs4_proc_read_setup,
8516 .read_done = nfs4_read_done,
8517 .write_setup = nfs4_proc_write_setup,
8518 .write_done = nfs4_write_done,
8519 .commit_setup = nfs4_proc_commit_setup,
8520 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8521 .commit_done = nfs4_commit_done,
8522 .lock = nfs4_proc_lock,
8523 .clear_acl_cache = nfs4_zap_acl_attr,
8524 .close_context = nfs4_close_context,
8525 .open_context = nfs4_atomic_open,
8526 .have_delegation = nfs4_have_delegation,
8527 .return_delegation = nfs4_inode_return_delegation,
8528 .alloc_client = nfs4_alloc_client,
8529 .init_client = nfs4_init_client,
8530 .free_client = nfs4_free_client,
8531 .create_server = nfs4_create_server,
8532 .clone_server = nfs_clone_server,
8533};
8534
8535static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8536 .prefix = XATTR_NAME_NFSV4_ACL,
8537 .list = nfs4_xattr_list_nfs4_acl,
8538 .get = nfs4_xattr_get_nfs4_acl,
8539 .set = nfs4_xattr_set_nfs4_acl,
8540};
8541
8542const struct xattr_handler *nfs4_xattr_handlers[] = {
8543 &nfs4_xattr_nfs4_acl_handler,
8544#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8545 &nfs4_xattr_nfs4_label_handler,
8546#endif
8547 NULL
8548};
8549
8550/*
8551 * Local variables:
8552 * c-basic-offset: 8
8553 * End:
8554 */
Linux 6.x block layer and io_uring tree(s)