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NFSv4: Ensure that we remove NFSv4.0 delegations when state has expired
[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_ACCESS:
162 return -EACCES;
163 case -NFS4ERR_FILE_OPEN:
164 return -EBUSY;
165 default:
166 dprintk("%s could not handle NFSv4 error %d\n",
167 __func__, -err);
168 break;
169 }
170 return -EIO;
171}
172
173/*
174 * This is our standard bitmap for GETATTR requests.
175 */
176const u32 nfs4_fattr_bitmap[3] = {
177 FATTR4_WORD0_TYPE
178 | FATTR4_WORD0_CHANGE
179 | FATTR4_WORD0_SIZE
180 | FATTR4_WORD0_FSID
181 | FATTR4_WORD0_FILEID,
182 FATTR4_WORD1_MODE
183 | FATTR4_WORD1_NUMLINKS
184 | FATTR4_WORD1_OWNER
185 | FATTR4_WORD1_OWNER_GROUP
186 | FATTR4_WORD1_RAWDEV
187 | FATTR4_WORD1_SPACE_USED
188 | FATTR4_WORD1_TIME_ACCESS
189 | FATTR4_WORD1_TIME_METADATA
190 | FATTR4_WORD1_TIME_MODIFY,
191#ifdef CONFIG_NFS_V4_SECURITY_LABEL
192 FATTR4_WORD2_SECURITY_LABEL
193#endif
194};
195
196static const u32 nfs4_pnfs_open_bitmap[3] = {
197 FATTR4_WORD0_TYPE
198 | FATTR4_WORD0_CHANGE
199 | FATTR4_WORD0_SIZE
200 | FATTR4_WORD0_FSID
201 | FATTR4_WORD0_FILEID,
202 FATTR4_WORD1_MODE
203 | FATTR4_WORD1_NUMLINKS
204 | FATTR4_WORD1_OWNER
205 | FATTR4_WORD1_OWNER_GROUP
206 | FATTR4_WORD1_RAWDEV
207 | FATTR4_WORD1_SPACE_USED
208 | FATTR4_WORD1_TIME_ACCESS
209 | FATTR4_WORD1_TIME_METADATA
210 | FATTR4_WORD1_TIME_MODIFY,
211 FATTR4_WORD2_MDSTHRESHOLD
212};
213
214static const u32 nfs4_open_noattr_bitmap[3] = {
215 FATTR4_WORD0_TYPE
216 | FATTR4_WORD0_CHANGE
217 | FATTR4_WORD0_FILEID,
218};
219
220const u32 nfs4_statfs_bitmap[3] = {
221 FATTR4_WORD0_FILES_AVAIL
222 | FATTR4_WORD0_FILES_FREE
223 | FATTR4_WORD0_FILES_TOTAL,
224 FATTR4_WORD1_SPACE_AVAIL
225 | FATTR4_WORD1_SPACE_FREE
226 | FATTR4_WORD1_SPACE_TOTAL
227};
228
229const u32 nfs4_pathconf_bitmap[3] = {
230 FATTR4_WORD0_MAXLINK
231 | FATTR4_WORD0_MAXNAME,
232 0
233};
234
235const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
236 | FATTR4_WORD0_MAXREAD
237 | FATTR4_WORD0_MAXWRITE
238 | FATTR4_WORD0_LEASE_TIME,
239 FATTR4_WORD1_TIME_DELTA
240 | FATTR4_WORD1_FS_LAYOUT_TYPES,
241 FATTR4_WORD2_LAYOUT_BLKSIZE
242};
243
244const u32 nfs4_fs_locations_bitmap[3] = {
245 FATTR4_WORD0_TYPE
246 | FATTR4_WORD0_CHANGE
247 | FATTR4_WORD0_SIZE
248 | FATTR4_WORD0_FSID
249 | FATTR4_WORD0_FILEID
250 | FATTR4_WORD0_FS_LOCATIONS,
251 FATTR4_WORD1_MODE
252 | FATTR4_WORD1_NUMLINKS
253 | FATTR4_WORD1_OWNER
254 | FATTR4_WORD1_OWNER_GROUP
255 | FATTR4_WORD1_RAWDEV
256 | FATTR4_WORD1_SPACE_USED
257 | FATTR4_WORD1_TIME_ACCESS
258 | FATTR4_WORD1_TIME_METADATA
259 | FATTR4_WORD1_TIME_MODIFY
260 | FATTR4_WORD1_MOUNTED_ON_FILEID,
261};
262
263static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
264 struct nfs4_readdir_arg *readdir)
265{
266 __be32 *start, *p;
267
268 if (cookie > 2) {
269 readdir->cookie = cookie;
270 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
271 return;
272 }
273
274 readdir->cookie = 0;
275 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
276 if (cookie == 2)
277 return;
278
279 /*
280 * NFSv4 servers do not return entries for '.' and '..'
281 * Therefore, we fake these entries here. We let '.'
282 * have cookie 0 and '..' have cookie 1. Note that
283 * when talking to the server, we always send cookie 0
284 * instead of 1 or 2.
285 */
286 start = p = kmap_atomic(*readdir->pages);
287
288 if (cookie == 0) {
289 *p++ = xdr_one; /* next */
290 *p++ = xdr_zero; /* cookie, first word */
291 *p++ = xdr_one; /* cookie, second word */
292 *p++ = xdr_one; /* entry len */
293 memcpy(p, ".\0\0\0", 4); /* entry */
294 p++;
295 *p++ = xdr_one; /* bitmap length */
296 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
297 *p++ = htonl(8); /* attribute buffer length */
298 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
299 }
300
301 *p++ = xdr_one; /* next */
302 *p++ = xdr_zero; /* cookie, first word */
303 *p++ = xdr_two; /* cookie, second word */
304 *p++ = xdr_two; /* entry len */
305 memcpy(p, "..\0\0", 4); /* entry */
306 p++;
307 *p++ = xdr_one; /* bitmap length */
308 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
309 *p++ = htonl(8); /* attribute buffer length */
310 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
311
312 readdir->pgbase = (char *)p - (char *)start;
313 readdir->count -= readdir->pgbase;
314 kunmap_atomic(start);
315}
316
317static long nfs4_update_delay(long *timeout)
318{
319 long ret;
320 if (!timeout)
321 return NFS4_POLL_RETRY_MAX;
322 if (*timeout <= 0)
323 *timeout = NFS4_POLL_RETRY_MIN;
324 if (*timeout > NFS4_POLL_RETRY_MAX)
325 *timeout = NFS4_POLL_RETRY_MAX;
326 ret = *timeout;
327 *timeout <<= 1;
328 return ret;
329}
330
331static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
332{
333 int res = 0;
334
335 might_sleep();
336
337 freezable_schedule_timeout_killable_unsafe(
338 nfs4_update_delay(timeout));
339 if (fatal_signal_pending(current))
340 res = -ERESTARTSYS;
341 return res;
342}
343
344/* This is the error handling routine for processes that are allowed
345 * to sleep.
346 */
347static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
348{
349 struct nfs_client *clp = server->nfs_client;
350 struct nfs4_state *state = exception->state;
351 struct inode *inode = exception->inode;
352 int ret = errorcode;
353
354 exception->retry = 0;
355 switch(errorcode) {
356 case 0:
357 return 0;
358 case -NFS4ERR_OPENMODE:
359 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
360 nfs4_inode_return_delegation(inode);
361 exception->retry = 1;
362 return 0;
363 }
364 if (state == NULL)
365 break;
366 ret = nfs4_schedule_stateid_recovery(server, state);
367 if (ret < 0)
368 break;
369 goto wait_on_recovery;
370 case -NFS4ERR_DELEG_REVOKED:
371 case -NFS4ERR_ADMIN_REVOKED:
372 case -NFS4ERR_BAD_STATEID:
373 if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
374 nfs_remove_bad_delegation(inode);
375 exception->retry = 1;
376 break;
377 }
378 if (state == NULL)
379 break;
380 ret = nfs4_schedule_stateid_recovery(server, state);
381 if (ret < 0)
382 break;
383 goto wait_on_recovery;
384 case -NFS4ERR_EXPIRED:
385 if (state != NULL) {
386 ret = nfs4_schedule_stateid_recovery(server, state);
387 if (ret < 0)
388 break;
389 }
390 case -NFS4ERR_STALE_STATEID:
391 case -NFS4ERR_STALE_CLIENTID:
392 nfs4_schedule_lease_recovery(clp);
393 goto wait_on_recovery;
394 case -NFS4ERR_MOVED:
395 ret = nfs4_schedule_migration_recovery(server);
396 if (ret < 0)
397 break;
398 goto wait_on_recovery;
399 case -NFS4ERR_LEASE_MOVED:
400 nfs4_schedule_lease_moved_recovery(clp);
401 goto wait_on_recovery;
402#if defined(CONFIG_NFS_V4_1)
403 case -NFS4ERR_BADSESSION:
404 case -NFS4ERR_BADSLOT:
405 case -NFS4ERR_BAD_HIGH_SLOT:
406 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
407 case -NFS4ERR_DEADSESSION:
408 case -NFS4ERR_SEQ_FALSE_RETRY:
409 case -NFS4ERR_SEQ_MISORDERED:
410 dprintk("%s ERROR: %d Reset session\n", __func__,
411 errorcode);
412 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
413 goto wait_on_recovery;
414#endif /* defined(CONFIG_NFS_V4_1) */
415 case -NFS4ERR_FILE_OPEN:
416 if (exception->timeout > HZ) {
417 /* We have retried a decent amount, time to
418 * fail
419 */
420 ret = -EBUSY;
421 break;
422 }
423 case -NFS4ERR_GRACE:
424 case -NFS4ERR_DELAY:
425 ret = nfs4_delay(server->client, &exception->timeout);
426 if (ret != 0)
427 break;
428 case -NFS4ERR_RETRY_UNCACHED_REP:
429 case -NFS4ERR_OLD_STATEID:
430 exception->retry = 1;
431 break;
432 case -NFS4ERR_BADOWNER:
433 /* The following works around a Linux server bug! */
434 case -NFS4ERR_BADNAME:
435 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
436 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
437 exception->retry = 1;
438 printk(KERN_WARNING "NFS: v4 server %s "
439 "does not accept raw "
440 "uid/gids. "
441 "Reenabling the idmapper.\n",
442 server->nfs_client->cl_hostname);
443 }
444 }
445 /* We failed to handle the error */
446 return nfs4_map_errors(ret);
447wait_on_recovery:
448 ret = nfs4_wait_clnt_recover(clp);
449 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
450 return -EIO;
451 if (ret == 0)
452 exception->retry = 1;
453 return ret;
454}
455
456/*
457 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
458 * or 'false' otherwise.
459 */
460static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
461{
462 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
463
464 if (flavor == RPC_AUTH_GSS_KRB5I ||
465 flavor == RPC_AUTH_GSS_KRB5P)
466 return true;
467
468 return false;
469}
470
471static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
472{
473 spin_lock(&clp->cl_lock);
474 if (time_before(clp->cl_last_renewal,timestamp))
475 clp->cl_last_renewal = timestamp;
476 spin_unlock(&clp->cl_lock);
477}
478
479static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
480{
481 do_renew_lease(server->nfs_client, timestamp);
482}
483
484struct nfs4_call_sync_data {
485 const struct nfs_server *seq_server;
486 struct nfs4_sequence_args *seq_args;
487 struct nfs4_sequence_res *seq_res;
488};
489
490static void nfs4_init_sequence(struct nfs4_sequence_args *args,
491 struct nfs4_sequence_res *res, int cache_reply)
492{
493 args->sa_slot = NULL;
494 args->sa_cache_this = cache_reply;
495 args->sa_privileged = 0;
496
497 res->sr_slot = NULL;
498}
499
500static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
501{
502 args->sa_privileged = 1;
503}
504
505static int nfs40_setup_sequence(const struct nfs_server *server,
506 struct nfs4_sequence_args *args,
507 struct nfs4_sequence_res *res,
508 struct rpc_task *task)
509{
510 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
511 struct nfs4_slot *slot;
512
513 /* slot already allocated? */
514 if (res->sr_slot != NULL)
515 goto out_start;
516
517 spin_lock(&tbl->slot_tbl_lock);
518 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
519 goto out_sleep;
520
521 slot = nfs4_alloc_slot(tbl);
522 if (IS_ERR(slot)) {
523 if (slot == ERR_PTR(-ENOMEM))
524 task->tk_timeout = HZ >> 2;
525 goto out_sleep;
526 }
527 spin_unlock(&tbl->slot_tbl_lock);
528
529 args->sa_slot = slot;
530 res->sr_slot = slot;
531
532out_start:
533 rpc_call_start(task);
534 return 0;
535
536out_sleep:
537 if (args->sa_privileged)
538 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
539 NULL, RPC_PRIORITY_PRIVILEGED);
540 else
541 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
542 spin_unlock(&tbl->slot_tbl_lock);
543 return -EAGAIN;
544}
545
546static int nfs40_sequence_done(struct rpc_task *task,
547 struct nfs4_sequence_res *res)
548{
549 struct nfs4_slot *slot = res->sr_slot;
550 struct nfs4_slot_table *tbl;
551
552 if (slot == NULL)
553 goto out;
554
555 tbl = slot->table;
556 spin_lock(&tbl->slot_tbl_lock);
557 if (!nfs41_wake_and_assign_slot(tbl, slot))
558 nfs4_free_slot(tbl, slot);
559 spin_unlock(&tbl->slot_tbl_lock);
560
561 res->sr_slot = NULL;
562out:
563 return 1;
564}
565
566#if defined(CONFIG_NFS_V4_1)
567
568static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
569{
570 struct nfs4_session *session;
571 struct nfs4_slot_table *tbl;
572 struct nfs4_slot *slot = res->sr_slot;
573 bool send_new_highest_used_slotid = false;
574
575 tbl = slot->table;
576 session = tbl->session;
577
578 spin_lock(&tbl->slot_tbl_lock);
579 /* Be nice to the server: try to ensure that the last transmitted
580 * value for highest_user_slotid <= target_highest_slotid
581 */
582 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
583 send_new_highest_used_slotid = true;
584
585 if (nfs41_wake_and_assign_slot(tbl, slot)) {
586 send_new_highest_used_slotid = false;
587 goto out_unlock;
588 }
589 nfs4_free_slot(tbl, slot);
590
591 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
592 send_new_highest_used_slotid = false;
593out_unlock:
594 spin_unlock(&tbl->slot_tbl_lock);
595 res->sr_slot = NULL;
596 if (send_new_highest_used_slotid)
597 nfs41_server_notify_highest_slotid_update(session->clp);
598}
599
600int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
601{
602 struct nfs4_session *session;
603 struct nfs4_slot *slot = res->sr_slot;
604 struct nfs_client *clp;
605 bool interrupted = false;
606 int ret = 1;
607
608 if (slot == NULL)
609 goto out_noaction;
610 /* don't increment the sequence number if the task wasn't sent */
611 if (!RPC_WAS_SENT(task))
612 goto out;
613
614 session = slot->table->session;
615
616 if (slot->interrupted) {
617 slot->interrupted = 0;
618 interrupted = true;
619 }
620
621 trace_nfs4_sequence_done(session, res);
622 /* Check the SEQUENCE operation status */
623 switch (res->sr_status) {
624 case 0:
625 /* Update the slot's sequence and clientid lease timer */
626 ++slot->seq_nr;
627 clp = session->clp;
628 do_renew_lease(clp, res->sr_timestamp);
629 /* Check sequence flags */
630 if (res->sr_status_flags != 0)
631 nfs4_schedule_lease_recovery(clp);
632 nfs41_update_target_slotid(slot->table, slot, res);
633 break;
634 case 1:
635 /*
636 * sr_status remains 1 if an RPC level error occurred.
637 * The server may or may not have processed the sequence
638 * operation..
639 * Mark the slot as having hosted an interrupted RPC call.
640 */
641 slot->interrupted = 1;
642 goto out;
643 case -NFS4ERR_DELAY:
644 /* The server detected a resend of the RPC call and
645 * returned NFS4ERR_DELAY as per Section 2.10.6.2
646 * of RFC5661.
647 */
648 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
649 __func__,
650 slot->slot_nr,
651 slot->seq_nr);
652 goto out_retry;
653 case -NFS4ERR_BADSLOT:
654 /*
655 * The slot id we used was probably retired. Try again
656 * using a different slot id.
657 */
658 goto retry_nowait;
659 case -NFS4ERR_SEQ_MISORDERED:
660 /*
661 * Was the last operation on this sequence interrupted?
662 * If so, retry after bumping the sequence number.
663 */
664 if (interrupted) {
665 ++slot->seq_nr;
666 goto retry_nowait;
667 }
668 /*
669 * Could this slot have been previously retired?
670 * If so, then the server may be expecting seq_nr = 1!
671 */
672 if (slot->seq_nr != 1) {
673 slot->seq_nr = 1;
674 goto retry_nowait;
675 }
676 break;
677 case -NFS4ERR_SEQ_FALSE_RETRY:
678 ++slot->seq_nr;
679 goto retry_nowait;
680 default:
681 /* Just update the slot sequence no. */
682 ++slot->seq_nr;
683 }
684out:
685 /* The session may be reset by one of the error handlers. */
686 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
687 nfs41_sequence_free_slot(res);
688out_noaction:
689 return ret;
690retry_nowait:
691 if (rpc_restart_call_prepare(task)) {
692 task->tk_status = 0;
693 ret = 0;
694 }
695 goto out;
696out_retry:
697 if (!rpc_restart_call(task))
698 goto out;
699 rpc_delay(task, NFS4_POLL_RETRY_MAX);
700 return 0;
701}
702EXPORT_SYMBOL_GPL(nfs41_sequence_done);
703
704static int nfs4_sequence_done(struct rpc_task *task,
705 struct nfs4_sequence_res *res)
706{
707 if (res->sr_slot == NULL)
708 return 1;
709 if (!res->sr_slot->table->session)
710 return nfs40_sequence_done(task, res);
711 return nfs41_sequence_done(task, res);
712}
713
714int nfs41_setup_sequence(struct nfs4_session *session,
715 struct nfs4_sequence_args *args,
716 struct nfs4_sequence_res *res,
717 struct rpc_task *task)
718{
719 struct nfs4_slot *slot;
720 struct nfs4_slot_table *tbl;
721
722 dprintk("--> %s\n", __func__);
723 /* slot already allocated? */
724 if (res->sr_slot != NULL)
725 goto out_success;
726
727 tbl = &session->fc_slot_table;
728
729 task->tk_timeout = 0;
730
731 spin_lock(&tbl->slot_tbl_lock);
732 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
733 !args->sa_privileged) {
734 /* The state manager will wait until the slot table is empty */
735 dprintk("%s session is draining\n", __func__);
736 goto out_sleep;
737 }
738
739 slot = nfs4_alloc_slot(tbl);
740 if (IS_ERR(slot)) {
741 /* If out of memory, try again in 1/4 second */
742 if (slot == ERR_PTR(-ENOMEM))
743 task->tk_timeout = HZ >> 2;
744 dprintk("<-- %s: no free slots\n", __func__);
745 goto out_sleep;
746 }
747 spin_unlock(&tbl->slot_tbl_lock);
748
749 args->sa_slot = slot;
750
751 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
752 slot->slot_nr, slot->seq_nr);
753
754 res->sr_slot = slot;
755 res->sr_timestamp = jiffies;
756 res->sr_status_flags = 0;
757 /*
758 * sr_status is only set in decode_sequence, and so will remain
759 * set to 1 if an rpc level failure occurs.
760 */
761 res->sr_status = 1;
762 trace_nfs4_setup_sequence(session, args);
763out_success:
764 rpc_call_start(task);
765 return 0;
766out_sleep:
767 /* Privileged tasks are queued with top priority */
768 if (args->sa_privileged)
769 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
770 NULL, RPC_PRIORITY_PRIVILEGED);
771 else
772 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
773 spin_unlock(&tbl->slot_tbl_lock);
774 return -EAGAIN;
775}
776EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
777
778static int nfs4_setup_sequence(const struct nfs_server *server,
779 struct nfs4_sequence_args *args,
780 struct nfs4_sequence_res *res,
781 struct rpc_task *task)
782{
783 struct nfs4_session *session = nfs4_get_session(server);
784 int ret = 0;
785
786 if (!session)
787 return nfs40_setup_sequence(server, args, res, task);
788
789 dprintk("--> %s clp %p session %p sr_slot %u\n",
790 __func__, session->clp, session, res->sr_slot ?
791 res->sr_slot->slot_nr : NFS4_NO_SLOT);
792
793 ret = nfs41_setup_sequence(session, args, res, task);
794
795 dprintk("<-- %s status=%d\n", __func__, ret);
796 return ret;
797}
798
799static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
800{
801 struct nfs4_call_sync_data *data = calldata;
802 struct nfs4_session *session = nfs4_get_session(data->seq_server);
803
804 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
805
806 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
807}
808
809static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
810{
811 struct nfs4_call_sync_data *data = calldata;
812
813 nfs41_sequence_done(task, data->seq_res);
814}
815
816static const struct rpc_call_ops nfs41_call_sync_ops = {
817 .rpc_call_prepare = nfs41_call_sync_prepare,
818 .rpc_call_done = nfs41_call_sync_done,
819};
820
821#else /* !CONFIG_NFS_V4_1 */
822
823static int nfs4_setup_sequence(const struct nfs_server *server,
824 struct nfs4_sequence_args *args,
825 struct nfs4_sequence_res *res,
826 struct rpc_task *task)
827{
828 return nfs40_setup_sequence(server, args, res, task);
829}
830
831static int nfs4_sequence_done(struct rpc_task *task,
832 struct nfs4_sequence_res *res)
833{
834 return nfs40_sequence_done(task, res);
835}
836
837#endif /* !CONFIG_NFS_V4_1 */
838
839static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
840{
841 struct nfs4_call_sync_data *data = calldata;
842 nfs4_setup_sequence(data->seq_server,
843 data->seq_args, data->seq_res, task);
844}
845
846static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
847{
848 struct nfs4_call_sync_data *data = calldata;
849 nfs4_sequence_done(task, data->seq_res);
850}
851
852static const struct rpc_call_ops nfs40_call_sync_ops = {
853 .rpc_call_prepare = nfs40_call_sync_prepare,
854 .rpc_call_done = nfs40_call_sync_done,
855};
856
857static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
858 struct nfs_server *server,
859 struct rpc_message *msg,
860 struct nfs4_sequence_args *args,
861 struct nfs4_sequence_res *res)
862{
863 int ret;
864 struct rpc_task *task;
865 struct nfs_client *clp = server->nfs_client;
866 struct nfs4_call_sync_data data = {
867 .seq_server = server,
868 .seq_args = args,
869 .seq_res = res,
870 };
871 struct rpc_task_setup task_setup = {
872 .rpc_client = clnt,
873 .rpc_message = msg,
874 .callback_ops = clp->cl_mvops->call_sync_ops,
875 .callback_data = &data
876 };
877
878 task = rpc_run_task(&task_setup);
879 if (IS_ERR(task))
880 ret = PTR_ERR(task);
881 else {
882 ret = task->tk_status;
883 rpc_put_task(task);
884 }
885 return ret;
886}
887
888int nfs4_call_sync(struct rpc_clnt *clnt,
889 struct nfs_server *server,
890 struct rpc_message *msg,
891 struct nfs4_sequence_args *args,
892 struct nfs4_sequence_res *res,
893 int cache_reply)
894{
895 nfs4_init_sequence(args, res, cache_reply);
896 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
897}
898
899static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
900{
901 struct nfs_inode *nfsi = NFS_I(dir);
902
903 spin_lock(&dir->i_lock);
904 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
905 if (!cinfo->atomic || cinfo->before != dir->i_version)
906 nfs_force_lookup_revalidate(dir);
907 dir->i_version = cinfo->after;
908 nfs_fscache_invalidate(dir);
909 spin_unlock(&dir->i_lock);
910}
911
912struct nfs4_opendata {
913 struct kref kref;
914 struct nfs_openargs o_arg;
915 struct nfs_openres o_res;
916 struct nfs_open_confirmargs c_arg;
917 struct nfs_open_confirmres c_res;
918 struct nfs4_string owner_name;
919 struct nfs4_string group_name;
920 struct nfs_fattr f_attr;
921 struct nfs4_label *f_label;
922 struct dentry *dir;
923 struct dentry *dentry;
924 struct nfs4_state_owner *owner;
925 struct nfs4_state *state;
926 struct iattr attrs;
927 unsigned long timestamp;
928 unsigned int rpc_done : 1;
929 unsigned int file_created : 1;
930 unsigned int is_recover : 1;
931 int rpc_status;
932 int cancelled;
933};
934
935static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
936 int err, struct nfs4_exception *exception)
937{
938 if (err != -EINVAL)
939 return false;
940 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
941 return false;
942 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
943 exception->retry = 1;
944 return true;
945}
946
947static enum open_claim_type4
948nfs4_map_atomic_open_claim(struct nfs_server *server,
949 enum open_claim_type4 claim)
950{
951 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
952 return claim;
953 switch (claim) {
954 default:
955 return claim;
956 case NFS4_OPEN_CLAIM_FH:
957 return NFS4_OPEN_CLAIM_NULL;
958 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
959 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
960 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
961 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
962 }
963}
964
965static void nfs4_init_opendata_res(struct nfs4_opendata *p)
966{
967 p->o_res.f_attr = &p->f_attr;
968 p->o_res.f_label = p->f_label;
969 p->o_res.seqid = p->o_arg.seqid;
970 p->c_res.seqid = p->c_arg.seqid;
971 p->o_res.server = p->o_arg.server;
972 p->o_res.access_request = p->o_arg.access;
973 nfs_fattr_init(&p->f_attr);
974 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
975}
976
977static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
978 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
979 const struct iattr *attrs,
980 struct nfs4_label *label,
981 enum open_claim_type4 claim,
982 gfp_t gfp_mask)
983{
984 struct dentry *parent = dget_parent(dentry);
985 struct inode *dir = parent->d_inode;
986 struct nfs_server *server = NFS_SERVER(dir);
987 struct nfs4_opendata *p;
988
989 p = kzalloc(sizeof(*p), gfp_mask);
990 if (p == NULL)
991 goto err;
992
993 p->f_label = nfs4_label_alloc(server, gfp_mask);
994 if (IS_ERR(p->f_label))
995 goto err_free_p;
996
997 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
998 if (p->o_arg.seqid == NULL)
999 goto err_free_label;
1000 nfs_sb_active(dentry->d_sb);
1001 p->dentry = dget(dentry);
1002 p->dir = parent;
1003 p->owner = sp;
1004 atomic_inc(&sp->so_count);
1005 p->o_arg.open_flags = flags;
1006 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1007 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1008 * will return permission denied for all bits until close */
1009 if (!(flags & O_EXCL)) {
1010 /* ask server to check for all possible rights as results
1011 * are cached */
1012 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1013 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1014 }
1015 p->o_arg.clientid = server->nfs_client->cl_clientid;
1016 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1017 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1018 p->o_arg.name = &dentry->d_name;
1019 p->o_arg.server = server;
1020 p->o_arg.bitmask = nfs4_bitmask(server, label);
1021 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1022 p->o_arg.label = label;
1023 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1024 switch (p->o_arg.claim) {
1025 case NFS4_OPEN_CLAIM_NULL:
1026 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1027 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1028 p->o_arg.fh = NFS_FH(dir);
1029 break;
1030 case NFS4_OPEN_CLAIM_PREVIOUS:
1031 case NFS4_OPEN_CLAIM_FH:
1032 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1033 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1034 p->o_arg.fh = NFS_FH(dentry->d_inode);
1035 }
1036 if (attrs != NULL && attrs->ia_valid != 0) {
1037 __u32 verf[2];
1038
1039 p->o_arg.u.attrs = &p->attrs;
1040 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1041
1042 verf[0] = jiffies;
1043 verf[1] = current->pid;
1044 memcpy(p->o_arg.u.verifier.data, verf,
1045 sizeof(p->o_arg.u.verifier.data));
1046 }
1047 p->c_arg.fh = &p->o_res.fh;
1048 p->c_arg.stateid = &p->o_res.stateid;
1049 p->c_arg.seqid = p->o_arg.seqid;
1050 nfs4_init_opendata_res(p);
1051 kref_init(&p->kref);
1052 return p;
1053
1054err_free_label:
1055 nfs4_label_free(p->f_label);
1056err_free_p:
1057 kfree(p);
1058err:
1059 dput(parent);
1060 return NULL;
1061}
1062
1063static void nfs4_opendata_free(struct kref *kref)
1064{
1065 struct nfs4_opendata *p = container_of(kref,
1066 struct nfs4_opendata, kref);
1067 struct super_block *sb = p->dentry->d_sb;
1068
1069 nfs_free_seqid(p->o_arg.seqid);
1070 if (p->state != NULL)
1071 nfs4_put_open_state(p->state);
1072 nfs4_put_state_owner(p->owner);
1073
1074 nfs4_label_free(p->f_label);
1075
1076 dput(p->dir);
1077 dput(p->dentry);
1078 nfs_sb_deactive(sb);
1079 nfs_fattr_free_names(&p->f_attr);
1080 kfree(p->f_attr.mdsthreshold);
1081 kfree(p);
1082}
1083
1084static void nfs4_opendata_put(struct nfs4_opendata *p)
1085{
1086 if (p != NULL)
1087 kref_put(&p->kref, nfs4_opendata_free);
1088}
1089
1090static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1091{
1092 int ret;
1093
1094 ret = rpc_wait_for_completion_task(task);
1095 return ret;
1096}
1097
1098static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1099{
1100 int ret = 0;
1101
1102 if (open_mode & (O_EXCL|O_TRUNC))
1103 goto out;
1104 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1105 case FMODE_READ:
1106 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1107 && state->n_rdonly != 0;
1108 break;
1109 case FMODE_WRITE:
1110 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1111 && state->n_wronly != 0;
1112 break;
1113 case FMODE_READ|FMODE_WRITE:
1114 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1115 && state->n_rdwr != 0;
1116 }
1117out:
1118 return ret;
1119}
1120
1121static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1122{
1123 if (delegation == NULL)
1124 return 0;
1125 if ((delegation->type & fmode) != fmode)
1126 return 0;
1127 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1128 return 0;
1129 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1130 return 0;
1131 nfs_mark_delegation_referenced(delegation);
1132 return 1;
1133}
1134
1135static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1136{
1137 switch (fmode) {
1138 case FMODE_WRITE:
1139 state->n_wronly++;
1140 break;
1141 case FMODE_READ:
1142 state->n_rdonly++;
1143 break;
1144 case FMODE_READ|FMODE_WRITE:
1145 state->n_rdwr++;
1146 }
1147 nfs4_state_set_mode_locked(state, state->state | fmode);
1148}
1149
1150static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1151{
1152 struct nfs_client *clp = state->owner->so_server->nfs_client;
1153 bool need_recover = false;
1154
1155 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1156 need_recover = true;
1157 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1158 need_recover = true;
1159 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1160 need_recover = true;
1161 if (need_recover)
1162 nfs4_state_mark_reclaim_nograce(clp, state);
1163}
1164
1165static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1166 nfs4_stateid *stateid)
1167{
1168 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1169 return true;
1170 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1171 nfs_test_and_clear_all_open_stateid(state);
1172 return true;
1173 }
1174 if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1175 return true;
1176 return false;
1177}
1178
1179static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1180 nfs4_stateid *stateid, fmode_t fmode)
1181{
1182 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1183 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1184 case FMODE_WRITE:
1185 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1186 break;
1187 case FMODE_READ:
1188 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1189 break;
1190 case 0:
1191 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1192 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1193 clear_bit(NFS_OPEN_STATE, &state->flags);
1194 }
1195 if (stateid == NULL)
1196 return;
1197 if (!nfs_need_update_open_stateid(state, stateid))
1198 return;
1199 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1200 nfs4_stateid_copy(&state->stateid, stateid);
1201 nfs4_stateid_copy(&state->open_stateid, stateid);
1202}
1203
1204static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205{
1206 write_seqlock(&state->seqlock);
1207 nfs_clear_open_stateid_locked(state, stateid, fmode);
1208 write_sequnlock(&state->seqlock);
1209 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1210 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1211}
1212
1213static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1214{
1215 switch (fmode) {
1216 case FMODE_READ:
1217 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1218 break;
1219 case FMODE_WRITE:
1220 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1221 break;
1222 case FMODE_READ|FMODE_WRITE:
1223 set_bit(NFS_O_RDWR_STATE, &state->flags);
1224 }
1225 if (!nfs_need_update_open_stateid(state, stateid))
1226 return;
1227 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1228 nfs4_stateid_copy(&state->stateid, stateid);
1229 nfs4_stateid_copy(&state->open_stateid, stateid);
1230}
1231
1232static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1233{
1234 /*
1235 * Protect the call to nfs4_state_set_mode_locked and
1236 * serialise the stateid update
1237 */
1238 write_seqlock(&state->seqlock);
1239 if (deleg_stateid != NULL) {
1240 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1241 set_bit(NFS_DELEGATED_STATE, &state->flags);
1242 }
1243 if (open_stateid != NULL)
1244 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1245 write_sequnlock(&state->seqlock);
1246 spin_lock(&state->owner->so_lock);
1247 update_open_stateflags(state, fmode);
1248 spin_unlock(&state->owner->so_lock);
1249}
1250
1251static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1252{
1253 struct nfs_inode *nfsi = NFS_I(state->inode);
1254 struct nfs_delegation *deleg_cur;
1255 int ret = 0;
1256
1257 fmode &= (FMODE_READ|FMODE_WRITE);
1258
1259 rcu_read_lock();
1260 deleg_cur = rcu_dereference(nfsi->delegation);
1261 if (deleg_cur == NULL)
1262 goto no_delegation;
1263
1264 spin_lock(&deleg_cur->lock);
1265 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1266 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1267 (deleg_cur->type & fmode) != fmode)
1268 goto no_delegation_unlock;
1269
1270 if (delegation == NULL)
1271 delegation = &deleg_cur->stateid;
1272 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1273 goto no_delegation_unlock;
1274
1275 nfs_mark_delegation_referenced(deleg_cur);
1276 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1277 ret = 1;
1278no_delegation_unlock:
1279 spin_unlock(&deleg_cur->lock);
1280no_delegation:
1281 rcu_read_unlock();
1282
1283 if (!ret && open_stateid != NULL) {
1284 __update_open_stateid(state, open_stateid, NULL, fmode);
1285 ret = 1;
1286 }
1287 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1288 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1289
1290 return ret;
1291}
1292
1293
1294static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1295{
1296 struct nfs_delegation *delegation;
1297
1298 rcu_read_lock();
1299 delegation = rcu_dereference(NFS_I(inode)->delegation);
1300 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1301 rcu_read_unlock();
1302 return;
1303 }
1304 rcu_read_unlock();
1305 nfs4_inode_return_delegation(inode);
1306}
1307
1308static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1309{
1310 struct nfs4_state *state = opendata->state;
1311 struct nfs_inode *nfsi = NFS_I(state->inode);
1312 struct nfs_delegation *delegation;
1313 int open_mode = opendata->o_arg.open_flags;
1314 fmode_t fmode = opendata->o_arg.fmode;
1315 nfs4_stateid stateid;
1316 int ret = -EAGAIN;
1317
1318 for (;;) {
1319 spin_lock(&state->owner->so_lock);
1320 if (can_open_cached(state, fmode, open_mode)) {
1321 update_open_stateflags(state, fmode);
1322 spin_unlock(&state->owner->so_lock);
1323 goto out_return_state;
1324 }
1325 spin_unlock(&state->owner->so_lock);
1326 rcu_read_lock();
1327 delegation = rcu_dereference(nfsi->delegation);
1328 if (!can_open_delegated(delegation, fmode)) {
1329 rcu_read_unlock();
1330 break;
1331 }
1332 /* Save the delegation */
1333 nfs4_stateid_copy(&stateid, &delegation->stateid);
1334 rcu_read_unlock();
1335 nfs_release_seqid(opendata->o_arg.seqid);
1336 if (!opendata->is_recover) {
1337 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1338 if (ret != 0)
1339 goto out;
1340 }
1341 ret = -EAGAIN;
1342
1343 /* Try to update the stateid using the delegation */
1344 if (update_open_stateid(state, NULL, &stateid, fmode))
1345 goto out_return_state;
1346 }
1347out:
1348 return ERR_PTR(ret);
1349out_return_state:
1350 atomic_inc(&state->count);
1351 return state;
1352}
1353
1354static void
1355nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1356{
1357 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1358 struct nfs_delegation *delegation;
1359 int delegation_flags = 0;
1360
1361 rcu_read_lock();
1362 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1363 if (delegation)
1364 delegation_flags = delegation->flags;
1365 rcu_read_unlock();
1366 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1367 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1368 "returning a delegation for "
1369 "OPEN(CLAIM_DELEGATE_CUR)\n",
1370 clp->cl_hostname);
1371 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1372 nfs_inode_set_delegation(state->inode,
1373 data->owner->so_cred,
1374 &data->o_res);
1375 else
1376 nfs_inode_reclaim_delegation(state->inode,
1377 data->owner->so_cred,
1378 &data->o_res);
1379}
1380
1381/*
1382 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1383 * and update the nfs4_state.
1384 */
1385static struct nfs4_state *
1386_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1387{
1388 struct inode *inode = data->state->inode;
1389 struct nfs4_state *state = data->state;
1390 int ret;
1391
1392 if (!data->rpc_done) {
1393 if (data->rpc_status) {
1394 ret = data->rpc_status;
1395 goto err;
1396 }
1397 /* cached opens have already been processed */
1398 goto update;
1399 }
1400
1401 ret = nfs_refresh_inode(inode, &data->f_attr);
1402 if (ret)
1403 goto err;
1404
1405 if (data->o_res.delegation_type != 0)
1406 nfs4_opendata_check_deleg(data, state);
1407update:
1408 update_open_stateid(state, &data->o_res.stateid, NULL,
1409 data->o_arg.fmode);
1410 atomic_inc(&state->count);
1411
1412 return state;
1413err:
1414 return ERR_PTR(ret);
1415
1416}
1417
1418static struct nfs4_state *
1419_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1420{
1421 struct inode *inode;
1422 struct nfs4_state *state = NULL;
1423 int ret;
1424
1425 if (!data->rpc_done) {
1426 state = nfs4_try_open_cached(data);
1427 goto out;
1428 }
1429
1430 ret = -EAGAIN;
1431 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1432 goto err;
1433 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1434 ret = PTR_ERR(inode);
1435 if (IS_ERR(inode))
1436 goto err;
1437 ret = -ENOMEM;
1438 state = nfs4_get_open_state(inode, data->owner);
1439 if (state == NULL)
1440 goto err_put_inode;
1441 if (data->o_res.delegation_type != 0)
1442 nfs4_opendata_check_deleg(data, state);
1443 update_open_stateid(state, &data->o_res.stateid, NULL,
1444 data->o_arg.fmode);
1445 iput(inode);
1446out:
1447 nfs_release_seqid(data->o_arg.seqid);
1448 return state;
1449err_put_inode:
1450 iput(inode);
1451err:
1452 return ERR_PTR(ret);
1453}
1454
1455static struct nfs4_state *
1456nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1457{
1458 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1459 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1460 return _nfs4_opendata_to_nfs4_state(data);
1461}
1462
1463static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1464{
1465 struct nfs_inode *nfsi = NFS_I(state->inode);
1466 struct nfs_open_context *ctx;
1467
1468 spin_lock(&state->inode->i_lock);
1469 list_for_each_entry(ctx, &nfsi->open_files, list) {
1470 if (ctx->state != state)
1471 continue;
1472 get_nfs_open_context(ctx);
1473 spin_unlock(&state->inode->i_lock);
1474 return ctx;
1475 }
1476 spin_unlock(&state->inode->i_lock);
1477 return ERR_PTR(-ENOENT);
1478}
1479
1480static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1481 struct nfs4_state *state, enum open_claim_type4 claim)
1482{
1483 struct nfs4_opendata *opendata;
1484
1485 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1486 NULL, NULL, claim, GFP_NOFS);
1487 if (opendata == NULL)
1488 return ERR_PTR(-ENOMEM);
1489 opendata->state = state;
1490 atomic_inc(&state->count);
1491 return opendata;
1492}
1493
1494static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1495{
1496 struct nfs4_state *newstate;
1497 int ret;
1498
1499 opendata->o_arg.open_flags = 0;
1500 opendata->o_arg.fmode = fmode;
1501 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1502 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1503 nfs4_init_opendata_res(opendata);
1504 ret = _nfs4_recover_proc_open(opendata);
1505 if (ret != 0)
1506 return ret;
1507 newstate = nfs4_opendata_to_nfs4_state(opendata);
1508 if (IS_ERR(newstate))
1509 return PTR_ERR(newstate);
1510 nfs4_close_state(newstate, fmode);
1511 *res = newstate;
1512 return 0;
1513}
1514
1515static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1516{
1517 struct nfs4_state *newstate;
1518 int ret;
1519
1520 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1521 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1522 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1523 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1524 /* memory barrier prior to reading state->n_* */
1525 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1526 clear_bit(NFS_OPEN_STATE, &state->flags);
1527 smp_rmb();
1528 if (state->n_rdwr != 0) {
1529 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1530 if (ret != 0)
1531 return ret;
1532 if (newstate != state)
1533 return -ESTALE;
1534 }
1535 if (state->n_wronly != 0) {
1536 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1537 if (ret != 0)
1538 return ret;
1539 if (newstate != state)
1540 return -ESTALE;
1541 }
1542 if (state->n_rdonly != 0) {
1543 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1544 if (ret != 0)
1545 return ret;
1546 if (newstate != state)
1547 return -ESTALE;
1548 }
1549 /*
1550 * We may have performed cached opens for all three recoveries.
1551 * Check if we need to update the current stateid.
1552 */
1553 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1554 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1555 write_seqlock(&state->seqlock);
1556 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1557 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1558 write_sequnlock(&state->seqlock);
1559 }
1560 return 0;
1561}
1562
1563/*
1564 * OPEN_RECLAIM:
1565 * reclaim state on the server after a reboot.
1566 */
1567static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1568{
1569 struct nfs_delegation *delegation;
1570 struct nfs4_opendata *opendata;
1571 fmode_t delegation_type = 0;
1572 int status;
1573
1574 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1575 NFS4_OPEN_CLAIM_PREVIOUS);
1576 if (IS_ERR(opendata))
1577 return PTR_ERR(opendata);
1578 rcu_read_lock();
1579 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1580 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1581 delegation_type = delegation->type;
1582 rcu_read_unlock();
1583 opendata->o_arg.u.delegation_type = delegation_type;
1584 status = nfs4_open_recover(opendata, state);
1585 nfs4_opendata_put(opendata);
1586 return status;
1587}
1588
1589static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1590{
1591 struct nfs_server *server = NFS_SERVER(state->inode);
1592 struct nfs4_exception exception = { };
1593 int err;
1594 do {
1595 err = _nfs4_do_open_reclaim(ctx, state);
1596 trace_nfs4_open_reclaim(ctx, 0, err);
1597 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1598 continue;
1599 if (err != -NFS4ERR_DELAY)
1600 break;
1601 nfs4_handle_exception(server, err, &exception);
1602 } while (exception.retry);
1603 return err;
1604}
1605
1606static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1607{
1608 struct nfs_open_context *ctx;
1609 int ret;
1610
1611 ctx = nfs4_state_find_open_context(state);
1612 if (IS_ERR(ctx))
1613 return -EAGAIN;
1614 ret = nfs4_do_open_reclaim(ctx, state);
1615 put_nfs_open_context(ctx);
1616 return ret;
1617}
1618
1619static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1620{
1621 switch (err) {
1622 default:
1623 printk(KERN_ERR "NFS: %s: unhandled error "
1624 "%d.\n", __func__, err);
1625 case 0:
1626 case -ENOENT:
1627 case -ESTALE:
1628 break;
1629 case -NFS4ERR_BADSESSION:
1630 case -NFS4ERR_BADSLOT:
1631 case -NFS4ERR_BAD_HIGH_SLOT:
1632 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1633 case -NFS4ERR_DEADSESSION:
1634 set_bit(NFS_DELEGATED_STATE, &state->flags);
1635 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1636 return -EAGAIN;
1637 case -NFS4ERR_STALE_CLIENTID:
1638 case -NFS4ERR_STALE_STATEID:
1639 set_bit(NFS_DELEGATED_STATE, &state->flags);
1640 case -NFS4ERR_EXPIRED:
1641 /* Don't recall a delegation if it was lost */
1642 nfs4_schedule_lease_recovery(server->nfs_client);
1643 return -EAGAIN;
1644 case -NFS4ERR_MOVED:
1645 nfs4_schedule_migration_recovery(server);
1646 return -EAGAIN;
1647 case -NFS4ERR_LEASE_MOVED:
1648 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1649 return -EAGAIN;
1650 case -NFS4ERR_DELEG_REVOKED:
1651 case -NFS4ERR_ADMIN_REVOKED:
1652 case -NFS4ERR_BAD_STATEID:
1653 case -NFS4ERR_OPENMODE:
1654 nfs_inode_find_state_and_recover(state->inode,
1655 stateid);
1656 nfs4_schedule_stateid_recovery(server, state);
1657 return 0;
1658 case -NFS4ERR_DELAY:
1659 case -NFS4ERR_GRACE:
1660 set_bit(NFS_DELEGATED_STATE, &state->flags);
1661 ssleep(1);
1662 return -EAGAIN;
1663 case -ENOMEM:
1664 case -NFS4ERR_DENIED:
1665 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1666 return 0;
1667 }
1668 return err;
1669}
1670
1671int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1672{
1673 struct nfs_server *server = NFS_SERVER(state->inode);
1674 struct nfs4_opendata *opendata;
1675 int err;
1676
1677 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1678 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1679 if (IS_ERR(opendata))
1680 return PTR_ERR(opendata);
1681 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1682 err = nfs4_open_recover(opendata, state);
1683 nfs4_opendata_put(opendata);
1684 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1685}
1686
1687static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1688{
1689 struct nfs4_opendata *data = calldata;
1690
1691 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1692 &data->c_res.seq_res, task);
1693}
1694
1695static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1696{
1697 struct nfs4_opendata *data = calldata;
1698
1699 nfs40_sequence_done(task, &data->c_res.seq_res);
1700
1701 data->rpc_status = task->tk_status;
1702 if (data->rpc_status == 0) {
1703 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1704 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1705 renew_lease(data->o_res.server, data->timestamp);
1706 data->rpc_done = 1;
1707 }
1708}
1709
1710static void nfs4_open_confirm_release(void *calldata)
1711{
1712 struct nfs4_opendata *data = calldata;
1713 struct nfs4_state *state = NULL;
1714
1715 /* If this request hasn't been cancelled, do nothing */
1716 if (data->cancelled == 0)
1717 goto out_free;
1718 /* In case of error, no cleanup! */
1719 if (!data->rpc_done)
1720 goto out_free;
1721 state = nfs4_opendata_to_nfs4_state(data);
1722 if (!IS_ERR(state))
1723 nfs4_close_state(state, data->o_arg.fmode);
1724out_free:
1725 nfs4_opendata_put(data);
1726}
1727
1728static const struct rpc_call_ops nfs4_open_confirm_ops = {
1729 .rpc_call_prepare = nfs4_open_confirm_prepare,
1730 .rpc_call_done = nfs4_open_confirm_done,
1731 .rpc_release = nfs4_open_confirm_release,
1732};
1733
1734/*
1735 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1736 */
1737static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1738{
1739 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1740 struct rpc_task *task;
1741 struct rpc_message msg = {
1742 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1743 .rpc_argp = &data->c_arg,
1744 .rpc_resp = &data->c_res,
1745 .rpc_cred = data->owner->so_cred,
1746 };
1747 struct rpc_task_setup task_setup_data = {
1748 .rpc_client = server->client,
1749 .rpc_message = &msg,
1750 .callback_ops = &nfs4_open_confirm_ops,
1751 .callback_data = data,
1752 .workqueue = nfsiod_workqueue,
1753 .flags = RPC_TASK_ASYNC,
1754 };
1755 int status;
1756
1757 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1758 kref_get(&data->kref);
1759 data->rpc_done = 0;
1760 data->rpc_status = 0;
1761 data->timestamp = jiffies;
1762 task = rpc_run_task(&task_setup_data);
1763 if (IS_ERR(task))
1764 return PTR_ERR(task);
1765 status = nfs4_wait_for_completion_rpc_task(task);
1766 if (status != 0) {
1767 data->cancelled = 1;
1768 smp_wmb();
1769 } else
1770 status = data->rpc_status;
1771 rpc_put_task(task);
1772 return status;
1773}
1774
1775static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1776{
1777 struct nfs4_opendata *data = calldata;
1778 struct nfs4_state_owner *sp = data->owner;
1779 struct nfs_client *clp = sp->so_server->nfs_client;
1780
1781 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1782 goto out_wait;
1783 /*
1784 * Check if we still need to send an OPEN call, or if we can use
1785 * a delegation instead.
1786 */
1787 if (data->state != NULL) {
1788 struct nfs_delegation *delegation;
1789
1790 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1791 goto out_no_action;
1792 rcu_read_lock();
1793 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1794 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1795 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1796 can_open_delegated(delegation, data->o_arg.fmode))
1797 goto unlock_no_action;
1798 rcu_read_unlock();
1799 }
1800 /* Update client id. */
1801 data->o_arg.clientid = clp->cl_clientid;
1802 switch (data->o_arg.claim) {
1803 case NFS4_OPEN_CLAIM_PREVIOUS:
1804 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1805 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1806 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1807 case NFS4_OPEN_CLAIM_FH:
1808 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1809 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1810 }
1811 data->timestamp = jiffies;
1812 if (nfs4_setup_sequence(data->o_arg.server,
1813 &data->o_arg.seq_args,
1814 &data->o_res.seq_res,
1815 task) != 0)
1816 nfs_release_seqid(data->o_arg.seqid);
1817
1818 /* Set the create mode (note dependency on the session type) */
1819 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1820 if (data->o_arg.open_flags & O_EXCL) {
1821 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1822 if (nfs4_has_persistent_session(clp))
1823 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1824 else if (clp->cl_mvops->minor_version > 0)
1825 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1826 }
1827 return;
1828unlock_no_action:
1829 rcu_read_unlock();
1830out_no_action:
1831 task->tk_action = NULL;
1832out_wait:
1833 nfs4_sequence_done(task, &data->o_res.seq_res);
1834}
1835
1836static void nfs4_open_done(struct rpc_task *task, void *calldata)
1837{
1838 struct nfs4_opendata *data = calldata;
1839
1840 data->rpc_status = task->tk_status;
1841
1842 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1843 return;
1844
1845 if (task->tk_status == 0) {
1846 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1847 switch (data->o_res.f_attr->mode & S_IFMT) {
1848 case S_IFREG:
1849 break;
1850 case S_IFLNK:
1851 data->rpc_status = -ELOOP;
1852 break;
1853 case S_IFDIR:
1854 data->rpc_status = -EISDIR;
1855 break;
1856 default:
1857 data->rpc_status = -ENOTDIR;
1858 }
1859 }
1860 renew_lease(data->o_res.server, data->timestamp);
1861 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1862 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1863 }
1864 data->rpc_done = 1;
1865}
1866
1867static void nfs4_open_release(void *calldata)
1868{
1869 struct nfs4_opendata *data = calldata;
1870 struct nfs4_state *state = NULL;
1871
1872 /* If this request hasn't been cancelled, do nothing */
1873 if (data->cancelled == 0)
1874 goto out_free;
1875 /* In case of error, no cleanup! */
1876 if (data->rpc_status != 0 || !data->rpc_done)
1877 goto out_free;
1878 /* In case we need an open_confirm, no cleanup! */
1879 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1880 goto out_free;
1881 state = nfs4_opendata_to_nfs4_state(data);
1882 if (!IS_ERR(state))
1883 nfs4_close_state(state, data->o_arg.fmode);
1884out_free:
1885 nfs4_opendata_put(data);
1886}
1887
1888static const struct rpc_call_ops nfs4_open_ops = {
1889 .rpc_call_prepare = nfs4_open_prepare,
1890 .rpc_call_done = nfs4_open_done,
1891 .rpc_release = nfs4_open_release,
1892};
1893
1894static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1895{
1896 struct inode *dir = data->dir->d_inode;
1897 struct nfs_server *server = NFS_SERVER(dir);
1898 struct nfs_openargs *o_arg = &data->o_arg;
1899 struct nfs_openres *o_res = &data->o_res;
1900 struct rpc_task *task;
1901 struct rpc_message msg = {
1902 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1903 .rpc_argp = o_arg,
1904 .rpc_resp = o_res,
1905 .rpc_cred = data->owner->so_cred,
1906 };
1907 struct rpc_task_setup task_setup_data = {
1908 .rpc_client = server->client,
1909 .rpc_message = &msg,
1910 .callback_ops = &nfs4_open_ops,
1911 .callback_data = data,
1912 .workqueue = nfsiod_workqueue,
1913 .flags = RPC_TASK_ASYNC,
1914 };
1915 int status;
1916
1917 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1918 kref_get(&data->kref);
1919 data->rpc_done = 0;
1920 data->rpc_status = 0;
1921 data->cancelled = 0;
1922 data->is_recover = 0;
1923 if (isrecover) {
1924 nfs4_set_sequence_privileged(&o_arg->seq_args);
1925 data->is_recover = 1;
1926 }
1927 task = rpc_run_task(&task_setup_data);
1928 if (IS_ERR(task))
1929 return PTR_ERR(task);
1930 status = nfs4_wait_for_completion_rpc_task(task);
1931 if (status != 0) {
1932 data->cancelled = 1;
1933 smp_wmb();
1934 } else
1935 status = data->rpc_status;
1936 rpc_put_task(task);
1937
1938 return status;
1939}
1940
1941static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1942{
1943 struct inode *dir = data->dir->d_inode;
1944 struct nfs_openres *o_res = &data->o_res;
1945 int status;
1946
1947 status = nfs4_run_open_task(data, 1);
1948 if (status != 0 || !data->rpc_done)
1949 return status;
1950
1951 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1952
1953 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1954 status = _nfs4_proc_open_confirm(data);
1955 if (status != 0)
1956 return status;
1957 }
1958
1959 return status;
1960}
1961
1962/*
1963 * Additional permission checks in order to distinguish between an
1964 * open for read, and an open for execute. This works around the
1965 * fact that NFSv4 OPEN treats read and execute permissions as being
1966 * the same.
1967 * Note that in the non-execute case, we want to turn off permission
1968 * checking if we just created a new file (POSIX open() semantics).
1969 */
1970static int nfs4_opendata_access(struct rpc_cred *cred,
1971 struct nfs4_opendata *opendata,
1972 struct nfs4_state *state, fmode_t fmode,
1973 int openflags)
1974{
1975 struct nfs_access_entry cache;
1976 u32 mask;
1977
1978 /* access call failed or for some reason the server doesn't
1979 * support any access modes -- defer access call until later */
1980 if (opendata->o_res.access_supported == 0)
1981 return 0;
1982
1983 mask = 0;
1984 /*
1985 * Use openflags to check for exec, because fmode won't
1986 * always have FMODE_EXEC set when file open for exec.
1987 */
1988 if (openflags & __FMODE_EXEC) {
1989 /* ONLY check for exec rights */
1990 mask = MAY_EXEC;
1991 } else if ((fmode & FMODE_READ) && !opendata->file_created)
1992 mask = MAY_READ;
1993
1994 cache.cred = cred;
1995 cache.jiffies = jiffies;
1996 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1997 nfs_access_add_cache(state->inode, &cache);
1998
1999 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2000 return 0;
2001
2002 /* even though OPEN succeeded, access is denied. Close the file */
2003 nfs4_close_state(state, fmode);
2004 return -EACCES;
2005}
2006
2007/*
2008 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2009 */
2010static int _nfs4_proc_open(struct nfs4_opendata *data)
2011{
2012 struct inode *dir = data->dir->d_inode;
2013 struct nfs_server *server = NFS_SERVER(dir);
2014 struct nfs_openargs *o_arg = &data->o_arg;
2015 struct nfs_openres *o_res = &data->o_res;
2016 int status;
2017
2018 status = nfs4_run_open_task(data, 0);
2019 if (!data->rpc_done)
2020 return status;
2021 if (status != 0) {
2022 if (status == -NFS4ERR_BADNAME &&
2023 !(o_arg->open_flags & O_CREAT))
2024 return -ENOENT;
2025 return status;
2026 }
2027
2028 nfs_fattr_map_and_free_names(server, &data->f_attr);
2029
2030 if (o_arg->open_flags & O_CREAT) {
2031 update_changeattr(dir, &o_res->cinfo);
2032 if (o_arg->open_flags & O_EXCL)
2033 data->file_created = 1;
2034 else if (o_res->cinfo.before != o_res->cinfo.after)
2035 data->file_created = 1;
2036 }
2037 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2038 server->caps &= ~NFS_CAP_POSIX_LOCK;
2039 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2040 status = _nfs4_proc_open_confirm(data);
2041 if (status != 0)
2042 return status;
2043 }
2044 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2045 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2046 return 0;
2047}
2048
2049static int nfs4_recover_expired_lease(struct nfs_server *server)
2050{
2051 return nfs4_client_recover_expired_lease(server->nfs_client);
2052}
2053
2054/*
2055 * OPEN_EXPIRED:
2056 * reclaim state on the server after a network partition.
2057 * Assumes caller holds the appropriate lock
2058 */
2059static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2060{
2061 struct nfs4_opendata *opendata;
2062 int ret;
2063
2064 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2065 NFS4_OPEN_CLAIM_FH);
2066 if (IS_ERR(opendata))
2067 return PTR_ERR(opendata);
2068 ret = nfs4_open_recover(opendata, state);
2069 if (ret == -ESTALE)
2070 d_drop(ctx->dentry);
2071 nfs4_opendata_put(opendata);
2072 return ret;
2073}
2074
2075static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2076{
2077 struct nfs_server *server = NFS_SERVER(state->inode);
2078 struct nfs4_exception exception = { };
2079 int err;
2080
2081 do {
2082 err = _nfs4_open_expired(ctx, state);
2083 trace_nfs4_open_expired(ctx, 0, err);
2084 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2085 continue;
2086 switch (err) {
2087 default:
2088 goto out;
2089 case -NFS4ERR_GRACE:
2090 case -NFS4ERR_DELAY:
2091 nfs4_handle_exception(server, err, &exception);
2092 err = 0;
2093 }
2094 } while (exception.retry);
2095out:
2096 return err;
2097}
2098
2099static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2100{
2101 struct nfs_open_context *ctx;
2102 int ret;
2103
2104 ctx = nfs4_state_find_open_context(state);
2105 if (IS_ERR(ctx))
2106 return -EAGAIN;
2107 ret = nfs4_do_open_expired(ctx, state);
2108 put_nfs_open_context(ctx);
2109 return ret;
2110}
2111
2112static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2113{
2114 nfs_remove_bad_delegation(state->inode);
2115 write_seqlock(&state->seqlock);
2116 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2117 write_sequnlock(&state->seqlock);
2118 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2119}
2120
2121static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2122{
2123 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2124 nfs_finish_clear_delegation_stateid(state);
2125}
2126
2127static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2128{
2129 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2130 nfs40_clear_delegation_stateid(state);
2131 return nfs4_open_expired(sp, state);
2132}
2133
2134#if defined(CONFIG_NFS_V4_1)
2135static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2136{
2137 struct nfs_server *server = NFS_SERVER(state->inode);
2138 nfs4_stateid *stateid = &state->stateid;
2139 struct nfs_delegation *delegation;
2140 struct rpc_cred *cred = NULL;
2141 int status = -NFS4ERR_BAD_STATEID;
2142
2143 /* If a state reset has been done, test_stateid is unneeded */
2144 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2145 return;
2146
2147 /* Get the delegation credential for use by test/free_stateid */
2148 rcu_read_lock();
2149 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2150 if (delegation != NULL &&
2151 nfs4_stateid_match(&delegation->stateid, stateid)) {
2152 cred = get_rpccred(delegation->cred);
2153 rcu_read_unlock();
2154 status = nfs41_test_stateid(server, stateid, cred);
2155 trace_nfs4_test_delegation_stateid(state, NULL, status);
2156 } else
2157 rcu_read_unlock();
2158
2159 if (status != NFS_OK) {
2160 /* Free the stateid unless the server explicitly
2161 * informs us the stateid is unrecognized. */
2162 if (status != -NFS4ERR_BAD_STATEID)
2163 nfs41_free_stateid(server, stateid, cred);
2164 nfs_remove_bad_delegation(state->inode);
2165
2166 write_seqlock(&state->seqlock);
2167 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2168 write_sequnlock(&state->seqlock);
2169 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2170 }
2171
2172 if (cred != NULL)
2173 put_rpccred(cred);
2174}
2175
2176/**
2177 * nfs41_check_open_stateid - possibly free an open stateid
2178 *
2179 * @state: NFSv4 state for an inode
2180 *
2181 * Returns NFS_OK if recovery for this stateid is now finished.
2182 * Otherwise a negative NFS4ERR value is returned.
2183 */
2184static int nfs41_check_open_stateid(struct nfs4_state *state)
2185{
2186 struct nfs_server *server = NFS_SERVER(state->inode);
2187 nfs4_stateid *stateid = &state->open_stateid;
2188 struct rpc_cred *cred = state->owner->so_cred;
2189 int status;
2190
2191 /* If a state reset has been done, test_stateid is unneeded */
2192 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2193 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2194 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2195 return -NFS4ERR_BAD_STATEID;
2196
2197 status = nfs41_test_stateid(server, stateid, cred);
2198 trace_nfs4_test_open_stateid(state, NULL, status);
2199 if (status != NFS_OK) {
2200 /* Free the stateid unless the server explicitly
2201 * informs us the stateid is unrecognized. */
2202 if (status != -NFS4ERR_BAD_STATEID)
2203 nfs41_free_stateid(server, stateid, cred);
2204
2205 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2206 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2207 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2208 clear_bit(NFS_OPEN_STATE, &state->flags);
2209 }
2210 return status;
2211}
2212
2213static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2214{
2215 int status;
2216
2217 nfs41_clear_delegation_stateid(state);
2218 status = nfs41_check_open_stateid(state);
2219 if (status != NFS_OK)
2220 status = nfs4_open_expired(sp, state);
2221 return status;
2222}
2223#endif
2224
2225/*
2226 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2227 * fields corresponding to attributes that were used to store the verifier.
2228 * Make sure we clobber those fields in the later setattr call
2229 */
2230static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2231{
2232 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2233 !(sattr->ia_valid & ATTR_ATIME_SET))
2234 sattr->ia_valid |= ATTR_ATIME;
2235
2236 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2237 !(sattr->ia_valid & ATTR_MTIME_SET))
2238 sattr->ia_valid |= ATTR_MTIME;
2239}
2240
2241static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2242 fmode_t fmode,
2243 int flags,
2244 struct nfs_open_context *ctx)
2245{
2246 struct nfs4_state_owner *sp = opendata->owner;
2247 struct nfs_server *server = sp->so_server;
2248 struct dentry *dentry;
2249 struct nfs4_state *state;
2250 unsigned int seq;
2251 int ret;
2252
2253 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2254
2255 ret = _nfs4_proc_open(opendata);
2256 if (ret != 0)
2257 goto out;
2258
2259 state = nfs4_opendata_to_nfs4_state(opendata);
2260 ret = PTR_ERR(state);
2261 if (IS_ERR(state))
2262 goto out;
2263 if (server->caps & NFS_CAP_POSIX_LOCK)
2264 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2265
2266 dentry = opendata->dentry;
2267 if (dentry->d_inode == NULL) {
2268 /* FIXME: Is this d_drop() ever needed? */
2269 d_drop(dentry);
2270 dentry = d_add_unique(dentry, igrab(state->inode));
2271 if (dentry == NULL) {
2272 dentry = opendata->dentry;
2273 } else if (dentry != ctx->dentry) {
2274 dput(ctx->dentry);
2275 ctx->dentry = dget(dentry);
2276 }
2277 nfs_set_verifier(dentry,
2278 nfs_save_change_attribute(opendata->dir->d_inode));
2279 }
2280
2281 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2282 if (ret != 0)
2283 goto out;
2284
2285 ctx->state = state;
2286 if (dentry->d_inode == state->inode) {
2287 nfs_inode_attach_open_context(ctx);
2288 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2289 nfs4_schedule_stateid_recovery(server, state);
2290 }
2291out:
2292 return ret;
2293}
2294
2295/*
2296 * Returns a referenced nfs4_state
2297 */
2298static int _nfs4_do_open(struct inode *dir,
2299 struct nfs_open_context *ctx,
2300 int flags,
2301 struct iattr *sattr,
2302 struct nfs4_label *label,
2303 int *opened)
2304{
2305 struct nfs4_state_owner *sp;
2306 struct nfs4_state *state = NULL;
2307 struct nfs_server *server = NFS_SERVER(dir);
2308 struct nfs4_opendata *opendata;
2309 struct dentry *dentry = ctx->dentry;
2310 struct rpc_cred *cred = ctx->cred;
2311 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2312 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2313 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2314 struct nfs4_label *olabel = NULL;
2315 int status;
2316
2317 /* Protect against reboot recovery conflicts */
2318 status = -ENOMEM;
2319 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2320 if (sp == NULL) {
2321 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2322 goto out_err;
2323 }
2324 status = nfs4_recover_expired_lease(server);
2325 if (status != 0)
2326 goto err_put_state_owner;
2327 if (dentry->d_inode != NULL)
2328 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2329 status = -ENOMEM;
2330 if (dentry->d_inode)
2331 claim = NFS4_OPEN_CLAIM_FH;
2332 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2333 label, claim, GFP_KERNEL);
2334 if (opendata == NULL)
2335 goto err_put_state_owner;
2336
2337 if (label) {
2338 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2339 if (IS_ERR(olabel)) {
2340 status = PTR_ERR(olabel);
2341 goto err_opendata_put;
2342 }
2343 }
2344
2345 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2346 if (!opendata->f_attr.mdsthreshold) {
2347 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2348 if (!opendata->f_attr.mdsthreshold)
2349 goto err_free_label;
2350 }
2351 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2352 }
2353 if (dentry->d_inode != NULL)
2354 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2355
2356 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2357 if (status != 0)
2358 goto err_free_label;
2359 state = ctx->state;
2360
2361 if ((opendata->o_arg.open_flags & O_EXCL) &&
2362 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2363 nfs4_exclusive_attrset(opendata, sattr);
2364
2365 nfs_fattr_init(opendata->o_res.f_attr);
2366 status = nfs4_do_setattr(state->inode, cred,
2367 opendata->o_res.f_attr, sattr,
2368 state, label, olabel);
2369 if (status == 0) {
2370 nfs_setattr_update_inode(state->inode, sattr);
2371 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2372 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2373 }
2374 }
2375 if (opendata->file_created)
2376 *opened |= FILE_CREATED;
2377
2378 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2379 *ctx_th = opendata->f_attr.mdsthreshold;
2380 opendata->f_attr.mdsthreshold = NULL;
2381 }
2382
2383 nfs4_label_free(olabel);
2384
2385 nfs4_opendata_put(opendata);
2386 nfs4_put_state_owner(sp);
2387 return 0;
2388err_free_label:
2389 nfs4_label_free(olabel);
2390err_opendata_put:
2391 nfs4_opendata_put(opendata);
2392err_put_state_owner:
2393 nfs4_put_state_owner(sp);
2394out_err:
2395 return status;
2396}
2397
2398
2399static struct nfs4_state *nfs4_do_open(struct inode *dir,
2400 struct nfs_open_context *ctx,
2401 int flags,
2402 struct iattr *sattr,
2403 struct nfs4_label *label,
2404 int *opened)
2405{
2406 struct nfs_server *server = NFS_SERVER(dir);
2407 struct nfs4_exception exception = { };
2408 struct nfs4_state *res;
2409 int status;
2410
2411 do {
2412 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2413 res = ctx->state;
2414 trace_nfs4_open_file(ctx, flags, status);
2415 if (status == 0)
2416 break;
2417 /* NOTE: BAD_SEQID means the server and client disagree about the
2418 * book-keeping w.r.t. state-changing operations
2419 * (OPEN/CLOSE/LOCK/LOCKU...)
2420 * It is actually a sign of a bug on the client or on the server.
2421 *
2422 * If we receive a BAD_SEQID error in the particular case of
2423 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2424 * have unhashed the old state_owner for us, and that we can
2425 * therefore safely retry using a new one. We should still warn
2426 * the user though...
2427 */
2428 if (status == -NFS4ERR_BAD_SEQID) {
2429 pr_warn_ratelimited("NFS: v4 server %s "
2430 " returned a bad sequence-id error!\n",
2431 NFS_SERVER(dir)->nfs_client->cl_hostname);
2432 exception.retry = 1;
2433 continue;
2434 }
2435 /*
2436 * BAD_STATEID on OPEN means that the server cancelled our
2437 * state before it received the OPEN_CONFIRM.
2438 * Recover by retrying the request as per the discussion
2439 * on Page 181 of RFC3530.
2440 */
2441 if (status == -NFS4ERR_BAD_STATEID) {
2442 exception.retry = 1;
2443 continue;
2444 }
2445 if (status == -EAGAIN) {
2446 /* We must have found a delegation */
2447 exception.retry = 1;
2448 continue;
2449 }
2450 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2451 continue;
2452 res = ERR_PTR(nfs4_handle_exception(server,
2453 status, &exception));
2454 } while (exception.retry);
2455 return res;
2456}
2457
2458static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2459 struct nfs_fattr *fattr, struct iattr *sattr,
2460 struct nfs4_state *state, struct nfs4_label *ilabel,
2461 struct nfs4_label *olabel)
2462{
2463 struct nfs_server *server = NFS_SERVER(inode);
2464 struct nfs_setattrargs arg = {
2465 .fh = NFS_FH(inode),
2466 .iap = sattr,
2467 .server = server,
2468 .bitmask = server->attr_bitmask,
2469 .label = ilabel,
2470 };
2471 struct nfs_setattrres res = {
2472 .fattr = fattr,
2473 .label = olabel,
2474 .server = server,
2475 };
2476 struct rpc_message msg = {
2477 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2478 .rpc_argp = &arg,
2479 .rpc_resp = &res,
2480 .rpc_cred = cred,
2481 };
2482 unsigned long timestamp = jiffies;
2483 fmode_t fmode;
2484 bool truncate;
2485 int status;
2486
2487 arg.bitmask = nfs4_bitmask(server, ilabel);
2488 if (ilabel)
2489 arg.bitmask = nfs4_bitmask(server, olabel);
2490
2491 nfs_fattr_init(fattr);
2492
2493 /* Servers should only apply open mode checks for file size changes */
2494 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2495 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2496
2497 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2498 /* Use that stateid */
2499 } else if (truncate && state != NULL) {
2500 struct nfs_lockowner lockowner = {
2501 .l_owner = current->files,
2502 .l_pid = current->tgid,
2503 };
2504 if (!nfs4_valid_open_stateid(state))
2505 return -EBADF;
2506 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2507 &lockowner) == -EIO)
2508 return -EBADF;
2509 } else
2510 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2511
2512 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2513 if (status == 0 && state != NULL)
2514 renew_lease(server, timestamp);
2515 return status;
2516}
2517
2518static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2519 struct nfs_fattr *fattr, struct iattr *sattr,
2520 struct nfs4_state *state, struct nfs4_label *ilabel,
2521 struct nfs4_label *olabel)
2522{
2523 struct nfs_server *server = NFS_SERVER(inode);
2524 struct nfs4_exception exception = {
2525 .state = state,
2526 .inode = inode,
2527 };
2528 int err;
2529 do {
2530 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2531 trace_nfs4_setattr(inode, err);
2532 switch (err) {
2533 case -NFS4ERR_OPENMODE:
2534 if (!(sattr->ia_valid & ATTR_SIZE)) {
2535 pr_warn_once("NFSv4: server %s is incorrectly "
2536 "applying open mode checks to "
2537 "a SETATTR that is not "
2538 "changing file size.\n",
2539 server->nfs_client->cl_hostname);
2540 }
2541 if (state && !(state->state & FMODE_WRITE)) {
2542 err = -EBADF;
2543 if (sattr->ia_valid & ATTR_OPEN)
2544 err = -EACCES;
2545 goto out;
2546 }
2547 }
2548 err = nfs4_handle_exception(server, err, &exception);
2549 } while (exception.retry);
2550out:
2551 return err;
2552}
2553
2554struct nfs4_closedata {
2555 struct inode *inode;
2556 struct nfs4_state *state;
2557 struct nfs_closeargs arg;
2558 struct nfs_closeres res;
2559 struct nfs_fattr fattr;
2560 unsigned long timestamp;
2561 bool roc;
2562 u32 roc_barrier;
2563};
2564
2565static void nfs4_free_closedata(void *data)
2566{
2567 struct nfs4_closedata *calldata = data;
2568 struct nfs4_state_owner *sp = calldata->state->owner;
2569 struct super_block *sb = calldata->state->inode->i_sb;
2570
2571 if (calldata->roc)
2572 pnfs_roc_release(calldata->state->inode);
2573 nfs4_put_open_state(calldata->state);
2574 nfs_free_seqid(calldata->arg.seqid);
2575 nfs4_put_state_owner(sp);
2576 nfs_sb_deactive(sb);
2577 kfree(calldata);
2578}
2579
2580static void nfs4_close_done(struct rpc_task *task, void *data)
2581{
2582 struct nfs4_closedata *calldata = data;
2583 struct nfs4_state *state = calldata->state;
2584 struct nfs_server *server = NFS_SERVER(calldata->inode);
2585 nfs4_stateid *res_stateid = NULL;
2586
2587 dprintk("%s: begin!\n", __func__);
2588 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2589 return;
2590 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2591 /* hmm. we are done with the inode, and in the process of freeing
2592 * the state_owner. we keep this around to process errors
2593 */
2594 switch (task->tk_status) {
2595 case 0:
2596 res_stateid = &calldata->res.stateid;
2597 if (calldata->arg.fmode == 0 && calldata->roc)
2598 pnfs_roc_set_barrier(state->inode,
2599 calldata->roc_barrier);
2600 renew_lease(server, calldata->timestamp);
2601 break;
2602 case -NFS4ERR_ADMIN_REVOKED:
2603 case -NFS4ERR_STALE_STATEID:
2604 case -NFS4ERR_OLD_STATEID:
2605 case -NFS4ERR_BAD_STATEID:
2606 case -NFS4ERR_EXPIRED:
2607 if (calldata->arg.fmode == 0)
2608 break;
2609 default:
2610 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2611 rpc_restart_call_prepare(task);
2612 goto out_release;
2613 }
2614 }
2615 nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2616out_release:
2617 nfs_release_seqid(calldata->arg.seqid);
2618 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2619 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2620}
2621
2622static void nfs4_close_prepare(struct rpc_task *task, void *data)
2623{
2624 struct nfs4_closedata *calldata = data;
2625 struct nfs4_state *state = calldata->state;
2626 struct inode *inode = calldata->inode;
2627 bool is_rdonly, is_wronly, is_rdwr;
2628 int call_close = 0;
2629
2630 dprintk("%s: begin!\n", __func__);
2631 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2632 goto out_wait;
2633
2634 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2635 spin_lock(&state->owner->so_lock);
2636 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2637 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2638 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2639 /* Calculate the change in open mode */
2640 calldata->arg.fmode = 0;
2641 if (state->n_rdwr == 0) {
2642 if (state->n_rdonly == 0)
2643 call_close |= is_rdonly;
2644 else if (is_rdonly)
2645 calldata->arg.fmode |= FMODE_READ;
2646 if (state->n_wronly == 0)
2647 call_close |= is_wronly;
2648 else if (is_wronly)
2649 calldata->arg.fmode |= FMODE_WRITE;
2650 } else if (is_rdwr)
2651 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2652
2653 if (calldata->arg.fmode == 0)
2654 call_close |= is_rdwr;
2655
2656 if (!nfs4_valid_open_stateid(state))
2657 call_close = 0;
2658 spin_unlock(&state->owner->so_lock);
2659
2660 if (!call_close) {
2661 /* Note: exit _without_ calling nfs4_close_done */
2662 goto out_no_action;
2663 }
2664
2665 if (calldata->arg.fmode == 0) {
2666 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2667 if (calldata->roc &&
2668 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2669 nfs_release_seqid(calldata->arg.seqid);
2670 goto out_wait;
2671 }
2672 }
2673
2674 nfs_fattr_init(calldata->res.fattr);
2675 calldata->timestamp = jiffies;
2676 if (nfs4_setup_sequence(NFS_SERVER(inode),
2677 &calldata->arg.seq_args,
2678 &calldata->res.seq_res,
2679 task) != 0)
2680 nfs_release_seqid(calldata->arg.seqid);
2681 dprintk("%s: done!\n", __func__);
2682 return;
2683out_no_action:
2684 task->tk_action = NULL;
2685out_wait:
2686 nfs4_sequence_done(task, &calldata->res.seq_res);
2687}
2688
2689static const struct rpc_call_ops nfs4_close_ops = {
2690 .rpc_call_prepare = nfs4_close_prepare,
2691 .rpc_call_done = nfs4_close_done,
2692 .rpc_release = nfs4_free_closedata,
2693};
2694
2695static bool nfs4_state_has_opener(struct nfs4_state *state)
2696{
2697 /* first check existing openers */
2698 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2699 state->n_rdonly != 0)
2700 return true;
2701
2702 if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2703 state->n_wronly != 0)
2704 return true;
2705
2706 if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2707 state->n_rdwr != 0)
2708 return true;
2709
2710 return false;
2711}
2712
2713static bool nfs4_roc(struct inode *inode)
2714{
2715 struct nfs_inode *nfsi = NFS_I(inode);
2716 struct nfs_open_context *ctx;
2717 struct nfs4_state *state;
2718
2719 spin_lock(&inode->i_lock);
2720 list_for_each_entry(ctx, &nfsi->open_files, list) {
2721 state = ctx->state;
2722 if (state == NULL)
2723 continue;
2724 if (nfs4_state_has_opener(state)) {
2725 spin_unlock(&inode->i_lock);
2726 return false;
2727 }
2728 }
2729 spin_unlock(&inode->i_lock);
2730
2731 if (nfs4_check_delegation(inode, FMODE_READ))
2732 return false;
2733
2734 return pnfs_roc(inode);
2735}
2736
2737/*
2738 * It is possible for data to be read/written from a mem-mapped file
2739 * after the sys_close call (which hits the vfs layer as a flush).
2740 * This means that we can't safely call nfsv4 close on a file until
2741 * the inode is cleared. This in turn means that we are not good
2742 * NFSv4 citizens - we do not indicate to the server to update the file's
2743 * share state even when we are done with one of the three share
2744 * stateid's in the inode.
2745 *
2746 * NOTE: Caller must be holding the sp->so_owner semaphore!
2747 */
2748int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2749{
2750 struct nfs_server *server = NFS_SERVER(state->inode);
2751 struct nfs4_closedata *calldata;
2752 struct nfs4_state_owner *sp = state->owner;
2753 struct rpc_task *task;
2754 struct rpc_message msg = {
2755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2756 .rpc_cred = state->owner->so_cred,
2757 };
2758 struct rpc_task_setup task_setup_data = {
2759 .rpc_client = server->client,
2760 .rpc_message = &msg,
2761 .callback_ops = &nfs4_close_ops,
2762 .workqueue = nfsiod_workqueue,
2763 .flags = RPC_TASK_ASYNC,
2764 };
2765 int status = -ENOMEM;
2766
2767 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2768 &task_setup_data.rpc_client, &msg);
2769
2770 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2771 if (calldata == NULL)
2772 goto out;
2773 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2774 calldata->inode = state->inode;
2775 calldata->state = state;
2776 calldata->arg.fh = NFS_FH(state->inode);
2777 calldata->arg.stateid = &state->open_stateid;
2778 /* Serialization for the sequence id */
2779 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2780 if (calldata->arg.seqid == NULL)
2781 goto out_free_calldata;
2782 calldata->arg.fmode = 0;
2783 calldata->arg.bitmask = server->cache_consistency_bitmask;
2784 calldata->res.fattr = &calldata->fattr;
2785 calldata->res.seqid = calldata->arg.seqid;
2786 calldata->res.server = server;
2787 calldata->roc = nfs4_roc(state->inode);
2788 nfs_sb_active(calldata->inode->i_sb);
2789
2790 msg.rpc_argp = &calldata->arg;
2791 msg.rpc_resp = &calldata->res;
2792 task_setup_data.callback_data = calldata;
2793 task = rpc_run_task(&task_setup_data);
2794 if (IS_ERR(task))
2795 return PTR_ERR(task);
2796 status = 0;
2797 if (wait)
2798 status = rpc_wait_for_completion_task(task);
2799 rpc_put_task(task);
2800 return status;
2801out_free_calldata:
2802 kfree(calldata);
2803out:
2804 nfs4_put_open_state(state);
2805 nfs4_put_state_owner(sp);
2806 return status;
2807}
2808
2809static struct inode *
2810nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2811 int open_flags, struct iattr *attr, int *opened)
2812{
2813 struct nfs4_state *state;
2814 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2815
2816 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2817
2818 /* Protect against concurrent sillydeletes */
2819 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2820
2821 nfs4_label_release_security(label);
2822
2823 if (IS_ERR(state))
2824 return ERR_CAST(state);
2825 return state->inode;
2826}
2827
2828static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2829{
2830 if (ctx->state == NULL)
2831 return;
2832 if (is_sync)
2833 nfs4_close_sync(ctx->state, ctx->mode);
2834 else
2835 nfs4_close_state(ctx->state, ctx->mode);
2836}
2837
2838#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2839#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2840#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2841
2842static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2843{
2844 struct nfs4_server_caps_arg args = {
2845 .fhandle = fhandle,
2846 };
2847 struct nfs4_server_caps_res res = {};
2848 struct rpc_message msg = {
2849 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2850 .rpc_argp = &args,
2851 .rpc_resp = &res,
2852 };
2853 int status;
2854
2855 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2856 if (status == 0) {
2857 /* Sanity check the server answers */
2858 switch (server->nfs_client->cl_minorversion) {
2859 case 0:
2860 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2861 res.attr_bitmask[2] = 0;
2862 break;
2863 case 1:
2864 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2865 break;
2866 case 2:
2867 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2868 }
2869 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2870 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2871 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2872 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2873 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2874 NFS_CAP_CTIME|NFS_CAP_MTIME|
2875 NFS_CAP_SECURITY_LABEL);
2876 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2877 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2878 server->caps |= NFS_CAP_ACLS;
2879 if (res.has_links != 0)
2880 server->caps |= NFS_CAP_HARDLINKS;
2881 if (res.has_symlinks != 0)
2882 server->caps |= NFS_CAP_SYMLINKS;
2883 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2884 server->caps |= NFS_CAP_FILEID;
2885 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2886 server->caps |= NFS_CAP_MODE;
2887 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2888 server->caps |= NFS_CAP_NLINK;
2889 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2890 server->caps |= NFS_CAP_OWNER;
2891 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2892 server->caps |= NFS_CAP_OWNER_GROUP;
2893 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2894 server->caps |= NFS_CAP_ATIME;
2895 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2896 server->caps |= NFS_CAP_CTIME;
2897 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2898 server->caps |= NFS_CAP_MTIME;
2899#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2900 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2901 server->caps |= NFS_CAP_SECURITY_LABEL;
2902#endif
2903 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2904 sizeof(server->attr_bitmask));
2905 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2906
2907 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2908 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2909 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2910 server->cache_consistency_bitmask[2] = 0;
2911 server->acl_bitmask = res.acl_bitmask;
2912 server->fh_expire_type = res.fh_expire_type;
2913 }
2914
2915 return status;
2916}
2917
2918int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2919{
2920 struct nfs4_exception exception = { };
2921 int err;
2922 do {
2923 err = nfs4_handle_exception(server,
2924 _nfs4_server_capabilities(server, fhandle),
2925 &exception);
2926 } while (exception.retry);
2927 return err;
2928}
2929
2930static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2931 struct nfs_fsinfo *info)
2932{
2933 u32 bitmask[3];
2934 struct nfs4_lookup_root_arg args = {
2935 .bitmask = bitmask,
2936 };
2937 struct nfs4_lookup_res res = {
2938 .server = server,
2939 .fattr = info->fattr,
2940 .fh = fhandle,
2941 };
2942 struct rpc_message msg = {
2943 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2944 .rpc_argp = &args,
2945 .rpc_resp = &res,
2946 };
2947
2948 bitmask[0] = nfs4_fattr_bitmap[0];
2949 bitmask[1] = nfs4_fattr_bitmap[1];
2950 /*
2951 * Process the label in the upcoming getfattr
2952 */
2953 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2954
2955 nfs_fattr_init(info->fattr);
2956 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2957}
2958
2959static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2960 struct nfs_fsinfo *info)
2961{
2962 struct nfs4_exception exception = { };
2963 int err;
2964 do {
2965 err = _nfs4_lookup_root(server, fhandle, info);
2966 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2967 switch (err) {
2968 case 0:
2969 case -NFS4ERR_WRONGSEC:
2970 goto out;
2971 default:
2972 err = nfs4_handle_exception(server, err, &exception);
2973 }
2974 } while (exception.retry);
2975out:
2976 return err;
2977}
2978
2979static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2980 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2981{
2982 struct rpc_auth_create_args auth_args = {
2983 .pseudoflavor = flavor,
2984 };
2985 struct rpc_auth *auth;
2986 int ret;
2987
2988 auth = rpcauth_create(&auth_args, server->client);
2989 if (IS_ERR(auth)) {
2990 ret = -EACCES;
2991 goto out;
2992 }
2993 ret = nfs4_lookup_root(server, fhandle, info);
2994out:
2995 return ret;
2996}
2997
2998/*
2999 * Retry pseudoroot lookup with various security flavors. We do this when:
3000 *
3001 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3002 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3003 *
3004 * Returns zero on success, or a negative NFS4ERR value, or a
3005 * negative errno value.
3006 */
3007static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3008 struct nfs_fsinfo *info)
3009{
3010 /* Per 3530bis 15.33.5 */
3011 static const rpc_authflavor_t flav_array[] = {
3012 RPC_AUTH_GSS_KRB5P,
3013 RPC_AUTH_GSS_KRB5I,
3014 RPC_AUTH_GSS_KRB5,
3015 RPC_AUTH_UNIX, /* courtesy */
3016 RPC_AUTH_NULL,
3017 };
3018 int status = -EPERM;
3019 size_t i;
3020
3021 if (server->auth_info.flavor_len > 0) {
3022 /* try each flavor specified by user */
3023 for (i = 0; i < server->auth_info.flavor_len; i++) {
3024 status = nfs4_lookup_root_sec(server, fhandle, info,
3025 server->auth_info.flavors[i]);
3026 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3027 continue;
3028 break;
3029 }
3030 } else {
3031 /* no flavors specified by user, try default list */
3032 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3033 status = nfs4_lookup_root_sec(server, fhandle, info,
3034 flav_array[i]);
3035 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3036 continue;
3037 break;
3038 }
3039 }
3040
3041 /*
3042 * -EACCESS could mean that the user doesn't have correct permissions
3043 * to access the mount. It could also mean that we tried to mount
3044 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
3045 * existing mount programs don't handle -EACCES very well so it should
3046 * be mapped to -EPERM instead.
3047 */
3048 if (status == -EACCES)
3049 status = -EPERM;
3050 return status;
3051}
3052
3053static int nfs4_do_find_root_sec(struct nfs_server *server,
3054 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3055{
3056 int mv = server->nfs_client->cl_minorversion;
3057 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3058}
3059
3060/**
3061 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3062 * @server: initialized nfs_server handle
3063 * @fhandle: we fill in the pseudo-fs root file handle
3064 * @info: we fill in an FSINFO struct
3065 * @auth_probe: probe the auth flavours
3066 *
3067 * Returns zero on success, or a negative errno.
3068 */
3069int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3070 struct nfs_fsinfo *info,
3071 bool auth_probe)
3072{
3073 int status;
3074
3075 switch (auth_probe) {
3076 case false:
3077 status = nfs4_lookup_root(server, fhandle, info);
3078 if (status != -NFS4ERR_WRONGSEC)
3079 break;
3080 default:
3081 status = nfs4_do_find_root_sec(server, fhandle, info);
3082 }
3083
3084 if (status == 0)
3085 status = nfs4_server_capabilities(server, fhandle);
3086 if (status == 0)
3087 status = nfs4_do_fsinfo(server, fhandle, info);
3088
3089 return nfs4_map_errors(status);
3090}
3091
3092static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3093 struct nfs_fsinfo *info)
3094{
3095 int error;
3096 struct nfs_fattr *fattr = info->fattr;
3097 struct nfs4_label *label = NULL;
3098
3099 error = nfs4_server_capabilities(server, mntfh);
3100 if (error < 0) {
3101 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3102 return error;
3103 }
3104
3105 label = nfs4_label_alloc(server, GFP_KERNEL);
3106 if (IS_ERR(label))
3107 return PTR_ERR(label);
3108
3109 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3110 if (error < 0) {
3111 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3112 goto err_free_label;
3113 }
3114
3115 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3116 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3117 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3118
3119err_free_label:
3120 nfs4_label_free(label);
3121
3122 return error;
3123}
3124
3125/*
3126 * Get locations and (maybe) other attributes of a referral.
3127 * Note that we'll actually follow the referral later when
3128 * we detect fsid mismatch in inode revalidation
3129 */
3130static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3131 const struct qstr *name, struct nfs_fattr *fattr,
3132 struct nfs_fh *fhandle)
3133{
3134 int status = -ENOMEM;
3135 struct page *page = NULL;
3136 struct nfs4_fs_locations *locations = NULL;
3137
3138 page = alloc_page(GFP_KERNEL);
3139 if (page == NULL)
3140 goto out;
3141 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3142 if (locations == NULL)
3143 goto out;
3144
3145 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3146 if (status != 0)
3147 goto out;
3148
3149 /*
3150 * If the fsid didn't change, this is a migration event, not a
3151 * referral. Cause us to drop into the exception handler, which
3152 * will kick off migration recovery.
3153 */
3154 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3155 dprintk("%s: server did not return a different fsid for"
3156 " a referral at %s\n", __func__, name->name);
3157 status = -NFS4ERR_MOVED;
3158 goto out;
3159 }
3160 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3161 nfs_fixup_referral_attributes(&locations->fattr);
3162
3163 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3164 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3165 memset(fhandle, 0, sizeof(struct nfs_fh));
3166out:
3167 if (page)
3168 __free_page(page);
3169 kfree(locations);
3170 return status;
3171}
3172
3173static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3174 struct nfs_fattr *fattr, struct nfs4_label *label)
3175{
3176 struct nfs4_getattr_arg args = {
3177 .fh = fhandle,
3178 .bitmask = server->attr_bitmask,
3179 };
3180 struct nfs4_getattr_res res = {
3181 .fattr = fattr,
3182 .label = label,
3183 .server = server,
3184 };
3185 struct rpc_message msg = {
3186 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3187 .rpc_argp = &args,
3188 .rpc_resp = &res,
3189 };
3190
3191 args.bitmask = nfs4_bitmask(server, label);
3192
3193 nfs_fattr_init(fattr);
3194 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3195}
3196
3197static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3198 struct nfs_fattr *fattr, struct nfs4_label *label)
3199{
3200 struct nfs4_exception exception = { };
3201 int err;
3202 do {
3203 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3204 trace_nfs4_getattr(server, fhandle, fattr, err);
3205 err = nfs4_handle_exception(server, err,
3206 &exception);
3207 } while (exception.retry);
3208 return err;
3209}
3210
3211/*
3212 * The file is not closed if it is opened due to the a request to change
3213 * the size of the file. The open call will not be needed once the
3214 * VFS layer lookup-intents are implemented.
3215 *
3216 * Close is called when the inode is destroyed.
3217 * If we haven't opened the file for O_WRONLY, we
3218 * need to in the size_change case to obtain a stateid.
3219 *
3220 * Got race?
3221 * Because OPEN is always done by name in nfsv4, it is
3222 * possible that we opened a different file by the same
3223 * name. We can recognize this race condition, but we
3224 * can't do anything about it besides returning an error.
3225 *
3226 * This will be fixed with VFS changes (lookup-intent).
3227 */
3228static int
3229nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3230 struct iattr *sattr)
3231{
3232 struct inode *inode = dentry->d_inode;
3233 struct rpc_cred *cred = NULL;
3234 struct nfs4_state *state = NULL;
3235 struct nfs4_label *label = NULL;
3236 int status;
3237
3238 if (pnfs_ld_layoutret_on_setattr(inode) &&
3239 sattr->ia_valid & ATTR_SIZE &&
3240 sattr->ia_size < i_size_read(inode))
3241 pnfs_commit_and_return_layout(inode);
3242
3243 nfs_fattr_init(fattr);
3244
3245 /* Deal with open(O_TRUNC) */
3246 if (sattr->ia_valid & ATTR_OPEN)
3247 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3248
3249 /* Optimization: if the end result is no change, don't RPC */
3250 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3251 return 0;
3252
3253 /* Search for an existing open(O_WRITE) file */
3254 if (sattr->ia_valid & ATTR_FILE) {
3255 struct nfs_open_context *ctx;
3256
3257 ctx = nfs_file_open_context(sattr->ia_file);
3258 if (ctx) {
3259 cred = ctx->cred;
3260 state = ctx->state;
3261 }
3262 }
3263
3264 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3265 if (IS_ERR(label))
3266 return PTR_ERR(label);
3267
3268 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3269 if (status == 0) {
3270 nfs_setattr_update_inode(inode, sattr);
3271 nfs_setsecurity(inode, fattr, label);
3272 }
3273 nfs4_label_free(label);
3274 return status;
3275}
3276
3277static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3278 const struct qstr *name, struct nfs_fh *fhandle,
3279 struct nfs_fattr *fattr, struct nfs4_label *label)
3280{
3281 struct nfs_server *server = NFS_SERVER(dir);
3282 int status;
3283 struct nfs4_lookup_arg args = {
3284 .bitmask = server->attr_bitmask,
3285 .dir_fh = NFS_FH(dir),
3286 .name = name,
3287 };
3288 struct nfs4_lookup_res res = {
3289 .server = server,
3290 .fattr = fattr,
3291 .label = label,
3292 .fh = fhandle,
3293 };
3294 struct rpc_message msg = {
3295 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3296 .rpc_argp = &args,
3297 .rpc_resp = &res,
3298 };
3299
3300 args.bitmask = nfs4_bitmask(server, label);
3301
3302 nfs_fattr_init(fattr);
3303
3304 dprintk("NFS call lookup %s\n", name->name);
3305 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3306 dprintk("NFS reply lookup: %d\n", status);
3307 return status;
3308}
3309
3310static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3311{
3312 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3313 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3314 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3315 fattr->nlink = 2;
3316}
3317
3318static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3319 struct qstr *name, struct nfs_fh *fhandle,
3320 struct nfs_fattr *fattr, struct nfs4_label *label)
3321{
3322 struct nfs4_exception exception = { };
3323 struct rpc_clnt *client = *clnt;
3324 int err;
3325 do {
3326 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3327 trace_nfs4_lookup(dir, name, err);
3328 switch (err) {
3329 case -NFS4ERR_BADNAME:
3330 err = -ENOENT;
3331 goto out;
3332 case -NFS4ERR_MOVED:
3333 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3334 goto out;
3335 case -NFS4ERR_WRONGSEC:
3336 err = -EPERM;
3337 if (client != *clnt)
3338 goto out;
3339 client = nfs4_negotiate_security(client, dir, name);
3340 if (IS_ERR(client))
3341 return PTR_ERR(client);
3342
3343 exception.retry = 1;
3344 break;
3345 default:
3346 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3347 }
3348 } while (exception.retry);
3349
3350out:
3351 if (err == 0)
3352 *clnt = client;
3353 else if (client != *clnt)
3354 rpc_shutdown_client(client);
3355
3356 return err;
3357}
3358
3359static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3360 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3361 struct nfs4_label *label)
3362{
3363 int status;
3364 struct rpc_clnt *client = NFS_CLIENT(dir);
3365
3366 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3367 if (client != NFS_CLIENT(dir)) {
3368 rpc_shutdown_client(client);
3369 nfs_fixup_secinfo_attributes(fattr);
3370 }
3371 return status;
3372}
3373
3374struct rpc_clnt *
3375nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3376 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3377{
3378 struct rpc_clnt *client = NFS_CLIENT(dir);
3379 int status;
3380
3381 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3382 if (status < 0)
3383 return ERR_PTR(status);
3384 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3385}
3386
3387static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3388{
3389 struct nfs_server *server = NFS_SERVER(inode);
3390 struct nfs4_accessargs args = {
3391 .fh = NFS_FH(inode),
3392 .bitmask = server->cache_consistency_bitmask,
3393 };
3394 struct nfs4_accessres res = {
3395 .server = server,
3396 };
3397 struct rpc_message msg = {
3398 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3399 .rpc_argp = &args,
3400 .rpc_resp = &res,
3401 .rpc_cred = entry->cred,
3402 };
3403 int mode = entry->mask;
3404 int status = 0;
3405
3406 /*
3407 * Determine which access bits we want to ask for...
3408 */
3409 if (mode & MAY_READ)
3410 args.access |= NFS4_ACCESS_READ;
3411 if (S_ISDIR(inode->i_mode)) {
3412 if (mode & MAY_WRITE)
3413 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3414 if (mode & MAY_EXEC)
3415 args.access |= NFS4_ACCESS_LOOKUP;
3416 } else {
3417 if (mode & MAY_WRITE)
3418 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3419 if (mode & MAY_EXEC)
3420 args.access |= NFS4_ACCESS_EXECUTE;
3421 }
3422
3423 res.fattr = nfs_alloc_fattr();
3424 if (res.fattr == NULL)
3425 return -ENOMEM;
3426
3427 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3428 if (!status) {
3429 nfs_access_set_mask(entry, res.access);
3430 nfs_refresh_inode(inode, res.fattr);
3431 }
3432 nfs_free_fattr(res.fattr);
3433 return status;
3434}
3435
3436static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3437{
3438 struct nfs4_exception exception = { };
3439 int err;
3440 do {
3441 err = _nfs4_proc_access(inode, entry);
3442 trace_nfs4_access(inode, err);
3443 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3444 &exception);
3445 } while (exception.retry);
3446 return err;
3447}
3448
3449/*
3450 * TODO: For the time being, we don't try to get any attributes
3451 * along with any of the zero-copy operations READ, READDIR,
3452 * READLINK, WRITE.
3453 *
3454 * In the case of the first three, we want to put the GETATTR
3455 * after the read-type operation -- this is because it is hard
3456 * to predict the length of a GETATTR response in v4, and thus
3457 * align the READ data correctly. This means that the GETATTR
3458 * may end up partially falling into the page cache, and we should
3459 * shift it into the 'tail' of the xdr_buf before processing.
3460 * To do this efficiently, we need to know the total length
3461 * of data received, which doesn't seem to be available outside
3462 * of the RPC layer.
3463 *
3464 * In the case of WRITE, we also want to put the GETATTR after
3465 * the operation -- in this case because we want to make sure
3466 * we get the post-operation mtime and size.
3467 *
3468 * Both of these changes to the XDR layer would in fact be quite
3469 * minor, but I decided to leave them for a subsequent patch.
3470 */
3471static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3472 unsigned int pgbase, unsigned int pglen)
3473{
3474 struct nfs4_readlink args = {
3475 .fh = NFS_FH(inode),
3476 .pgbase = pgbase,
3477 .pglen = pglen,
3478 .pages = &page,
3479 };
3480 struct nfs4_readlink_res res;
3481 struct rpc_message msg = {
3482 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3483 .rpc_argp = &args,
3484 .rpc_resp = &res,
3485 };
3486
3487 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3488}
3489
3490static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3491 unsigned int pgbase, unsigned int pglen)
3492{
3493 struct nfs4_exception exception = { };
3494 int err;
3495 do {
3496 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3497 trace_nfs4_readlink(inode, err);
3498 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3499 &exception);
3500 } while (exception.retry);
3501 return err;
3502}
3503
3504/*
3505 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3506 */
3507static int
3508nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3509 int flags)
3510{
3511 struct nfs4_label l, *ilabel = NULL;
3512 struct nfs_open_context *ctx;
3513 struct nfs4_state *state;
3514 int opened = 0;
3515 int status = 0;
3516
3517 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3518 if (IS_ERR(ctx))
3519 return PTR_ERR(ctx);
3520
3521 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3522
3523 sattr->ia_mode &= ~current_umask();
3524 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3525 if (IS_ERR(state)) {
3526 status = PTR_ERR(state);
3527 goto out;
3528 }
3529out:
3530 nfs4_label_release_security(ilabel);
3531 put_nfs_open_context(ctx);
3532 return status;
3533}
3534
3535static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3536{
3537 struct nfs_server *server = NFS_SERVER(dir);
3538 struct nfs_removeargs args = {
3539 .fh = NFS_FH(dir),
3540 .name = *name,
3541 };
3542 struct nfs_removeres res = {
3543 .server = server,
3544 };
3545 struct rpc_message msg = {
3546 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3547 .rpc_argp = &args,
3548 .rpc_resp = &res,
3549 };
3550 int status;
3551
3552 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3553 if (status == 0)
3554 update_changeattr(dir, &res.cinfo);
3555 return status;
3556}
3557
3558static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3559{
3560 struct nfs4_exception exception = { };
3561 int err;
3562 do {
3563 err = _nfs4_proc_remove(dir, name);
3564 trace_nfs4_remove(dir, name, err);
3565 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3566 &exception);
3567 } while (exception.retry);
3568 return err;
3569}
3570
3571static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3572{
3573 struct nfs_server *server = NFS_SERVER(dir);
3574 struct nfs_removeargs *args = msg->rpc_argp;
3575 struct nfs_removeres *res = msg->rpc_resp;
3576
3577 res->server = server;
3578 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3579 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3580
3581 nfs_fattr_init(res->dir_attr);
3582}
3583
3584static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3585{
3586 nfs4_setup_sequence(NFS_SERVER(data->dir),
3587 &data->args.seq_args,
3588 &data->res.seq_res,
3589 task);
3590}
3591
3592static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3593{
3594 struct nfs_unlinkdata *data = task->tk_calldata;
3595 struct nfs_removeres *res = &data->res;
3596
3597 if (!nfs4_sequence_done(task, &res->seq_res))
3598 return 0;
3599 if (nfs4_async_handle_error(task, res->server, NULL,
3600 &data->timeout) == -EAGAIN)
3601 return 0;
3602 update_changeattr(dir, &res->cinfo);
3603 return 1;
3604}
3605
3606static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3607{
3608 struct nfs_server *server = NFS_SERVER(dir);
3609 struct nfs_renameargs *arg = msg->rpc_argp;
3610 struct nfs_renameres *res = msg->rpc_resp;
3611
3612 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3613 res->server = server;
3614 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3615}
3616
3617static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3618{
3619 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3620 &data->args.seq_args,
3621 &data->res.seq_res,
3622 task);
3623}
3624
3625static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3626 struct inode *new_dir)
3627{
3628 struct nfs_renamedata *data = task->tk_calldata;
3629 struct nfs_renameres *res = &data->res;
3630
3631 if (!nfs4_sequence_done(task, &res->seq_res))
3632 return 0;
3633 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3634 return 0;
3635
3636 update_changeattr(old_dir, &res->old_cinfo);
3637 update_changeattr(new_dir, &res->new_cinfo);
3638 return 1;
3639}
3640
3641static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3642{
3643 struct nfs_server *server = NFS_SERVER(inode);
3644 struct nfs4_link_arg arg = {
3645 .fh = NFS_FH(inode),
3646 .dir_fh = NFS_FH(dir),
3647 .name = name,
3648 .bitmask = server->attr_bitmask,
3649 };
3650 struct nfs4_link_res res = {
3651 .server = server,
3652 .label = NULL,
3653 };
3654 struct rpc_message msg = {
3655 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3656 .rpc_argp = &arg,
3657 .rpc_resp = &res,
3658 };
3659 int status = -ENOMEM;
3660
3661 res.fattr = nfs_alloc_fattr();
3662 if (res.fattr == NULL)
3663 goto out;
3664
3665 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3666 if (IS_ERR(res.label)) {
3667 status = PTR_ERR(res.label);
3668 goto out;
3669 }
3670 arg.bitmask = nfs4_bitmask(server, res.label);
3671
3672 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3673 if (!status) {
3674 update_changeattr(dir, &res.cinfo);
3675 status = nfs_post_op_update_inode(inode, res.fattr);
3676 if (!status)
3677 nfs_setsecurity(inode, res.fattr, res.label);
3678 }
3679
3680
3681 nfs4_label_free(res.label);
3682
3683out:
3684 nfs_free_fattr(res.fattr);
3685 return status;
3686}
3687
3688static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3689{
3690 struct nfs4_exception exception = { };
3691 int err;
3692 do {
3693 err = nfs4_handle_exception(NFS_SERVER(inode),
3694 _nfs4_proc_link(inode, dir, name),
3695 &exception);
3696 } while (exception.retry);
3697 return err;
3698}
3699
3700struct nfs4_createdata {
3701 struct rpc_message msg;
3702 struct nfs4_create_arg arg;
3703 struct nfs4_create_res res;
3704 struct nfs_fh fh;
3705 struct nfs_fattr fattr;
3706 struct nfs4_label *label;
3707};
3708
3709static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3710 struct qstr *name, struct iattr *sattr, u32 ftype)
3711{
3712 struct nfs4_createdata *data;
3713
3714 data = kzalloc(sizeof(*data), GFP_KERNEL);
3715 if (data != NULL) {
3716 struct nfs_server *server = NFS_SERVER(dir);
3717
3718 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3719 if (IS_ERR(data->label))
3720 goto out_free;
3721
3722 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3723 data->msg.rpc_argp = &data->arg;
3724 data->msg.rpc_resp = &data->res;
3725 data->arg.dir_fh = NFS_FH(dir);
3726 data->arg.server = server;
3727 data->arg.name = name;
3728 data->arg.attrs = sattr;
3729 data->arg.ftype = ftype;
3730 data->arg.bitmask = nfs4_bitmask(server, data->label);
3731 data->res.server = server;
3732 data->res.fh = &data->fh;
3733 data->res.fattr = &data->fattr;
3734 data->res.label = data->label;
3735 nfs_fattr_init(data->res.fattr);
3736 }
3737 return data;
3738out_free:
3739 kfree(data);
3740 return NULL;
3741}
3742
3743static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3744{
3745 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3746 &data->arg.seq_args, &data->res.seq_res, 1);
3747 if (status == 0) {
3748 update_changeattr(dir, &data->res.dir_cinfo);
3749 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3750 }
3751 return status;
3752}
3753
3754static void nfs4_free_createdata(struct nfs4_createdata *data)
3755{
3756 nfs4_label_free(data->label);
3757 kfree(data);
3758}
3759
3760static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3761 struct page *page, unsigned int len, struct iattr *sattr,
3762 struct nfs4_label *label)
3763{
3764 struct nfs4_createdata *data;
3765 int status = -ENAMETOOLONG;
3766
3767 if (len > NFS4_MAXPATHLEN)
3768 goto out;
3769
3770 status = -ENOMEM;
3771 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3772 if (data == NULL)
3773 goto out;
3774
3775 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3776 data->arg.u.symlink.pages = &page;
3777 data->arg.u.symlink.len = len;
3778 data->arg.label = label;
3779
3780 status = nfs4_do_create(dir, dentry, data);
3781
3782 nfs4_free_createdata(data);
3783out:
3784 return status;
3785}
3786
3787static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3788 struct page *page, unsigned int len, struct iattr *sattr)
3789{
3790 struct nfs4_exception exception = { };
3791 struct nfs4_label l, *label = NULL;
3792 int err;
3793
3794 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3795
3796 do {
3797 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3798 trace_nfs4_symlink(dir, &dentry->d_name, err);
3799 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3800 &exception);
3801 } while (exception.retry);
3802
3803 nfs4_label_release_security(label);
3804 return err;
3805}
3806
3807static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3808 struct iattr *sattr, struct nfs4_label *label)
3809{
3810 struct nfs4_createdata *data;
3811 int status = -ENOMEM;
3812
3813 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3814 if (data == NULL)
3815 goto out;
3816
3817 data->arg.label = label;
3818 status = nfs4_do_create(dir, dentry, data);
3819
3820 nfs4_free_createdata(data);
3821out:
3822 return status;
3823}
3824
3825static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3826 struct iattr *sattr)
3827{
3828 struct nfs4_exception exception = { };
3829 struct nfs4_label l, *label = NULL;
3830 int err;
3831
3832 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3833
3834 sattr->ia_mode &= ~current_umask();
3835 do {
3836 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3837 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3838 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3839 &exception);
3840 } while (exception.retry);
3841 nfs4_label_release_security(label);
3842
3843 return err;
3844}
3845
3846static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3847 u64 cookie, struct page **pages, unsigned int count, int plus)
3848{
3849 struct inode *dir = dentry->d_inode;
3850 struct nfs4_readdir_arg args = {
3851 .fh = NFS_FH(dir),
3852 .pages = pages,
3853 .pgbase = 0,
3854 .count = count,
3855 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3856 .plus = plus,
3857 };
3858 struct nfs4_readdir_res res;
3859 struct rpc_message msg = {
3860 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3861 .rpc_argp = &args,
3862 .rpc_resp = &res,
3863 .rpc_cred = cred,
3864 };
3865 int status;
3866
3867 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3868 dentry,
3869 (unsigned long long)cookie);
3870 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3871 res.pgbase = args.pgbase;
3872 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3873 if (status >= 0) {
3874 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3875 status += args.pgbase;
3876 }
3877
3878 nfs_invalidate_atime(dir);
3879
3880 dprintk("%s: returns %d\n", __func__, status);
3881 return status;
3882}
3883
3884static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3885 u64 cookie, struct page **pages, unsigned int count, int plus)
3886{
3887 struct nfs4_exception exception = { };
3888 int err;
3889 do {
3890 err = _nfs4_proc_readdir(dentry, cred, cookie,
3891 pages, count, plus);
3892 trace_nfs4_readdir(dentry->d_inode, err);
3893 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3894 &exception);
3895 } while (exception.retry);
3896 return err;
3897}
3898
3899static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3900 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3901{
3902 struct nfs4_createdata *data;
3903 int mode = sattr->ia_mode;
3904 int status = -ENOMEM;
3905
3906 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3907 if (data == NULL)
3908 goto out;
3909
3910 if (S_ISFIFO(mode))
3911 data->arg.ftype = NF4FIFO;
3912 else if (S_ISBLK(mode)) {
3913 data->arg.ftype = NF4BLK;
3914 data->arg.u.device.specdata1 = MAJOR(rdev);
3915 data->arg.u.device.specdata2 = MINOR(rdev);
3916 }
3917 else if (S_ISCHR(mode)) {
3918 data->arg.ftype = NF4CHR;
3919 data->arg.u.device.specdata1 = MAJOR(rdev);
3920 data->arg.u.device.specdata2 = MINOR(rdev);
3921 } else if (!S_ISSOCK(mode)) {
3922 status = -EINVAL;
3923 goto out_free;
3924 }
3925
3926 data->arg.label = label;
3927 status = nfs4_do_create(dir, dentry, data);
3928out_free:
3929 nfs4_free_createdata(data);
3930out:
3931 return status;
3932}
3933
3934static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3935 struct iattr *sattr, dev_t rdev)
3936{
3937 struct nfs4_exception exception = { };
3938 struct nfs4_label l, *label = NULL;
3939 int err;
3940
3941 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3942
3943 sattr->ia_mode &= ~current_umask();
3944 do {
3945 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3946 trace_nfs4_mknod(dir, &dentry->d_name, err);
3947 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3948 &exception);
3949 } while (exception.retry);
3950
3951 nfs4_label_release_security(label);
3952
3953 return err;
3954}
3955
3956static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3957 struct nfs_fsstat *fsstat)
3958{
3959 struct nfs4_statfs_arg args = {
3960 .fh = fhandle,
3961 .bitmask = server->attr_bitmask,
3962 };
3963 struct nfs4_statfs_res res = {
3964 .fsstat = fsstat,
3965 };
3966 struct rpc_message msg = {
3967 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3968 .rpc_argp = &args,
3969 .rpc_resp = &res,
3970 };
3971
3972 nfs_fattr_init(fsstat->fattr);
3973 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3974}
3975
3976static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3977{
3978 struct nfs4_exception exception = { };
3979 int err;
3980 do {
3981 err = nfs4_handle_exception(server,
3982 _nfs4_proc_statfs(server, fhandle, fsstat),
3983 &exception);
3984 } while (exception.retry);
3985 return err;
3986}
3987
3988static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3989 struct nfs_fsinfo *fsinfo)
3990{
3991 struct nfs4_fsinfo_arg args = {
3992 .fh = fhandle,
3993 .bitmask = server->attr_bitmask,
3994 };
3995 struct nfs4_fsinfo_res res = {
3996 .fsinfo = fsinfo,
3997 };
3998 struct rpc_message msg = {
3999 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4000 .rpc_argp = &args,
4001 .rpc_resp = &res,
4002 };
4003
4004 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4005}
4006
4007static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4008{
4009 struct nfs4_exception exception = { };
4010 unsigned long now = jiffies;
4011 int err;
4012
4013 do {
4014 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4015 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4016 if (err == 0) {
4017 struct nfs_client *clp = server->nfs_client;
4018
4019 spin_lock(&clp->cl_lock);
4020 clp->cl_lease_time = fsinfo->lease_time * HZ;
4021 clp->cl_last_renewal = now;
4022 spin_unlock(&clp->cl_lock);
4023 break;
4024 }
4025 err = nfs4_handle_exception(server, err, &exception);
4026 } while (exception.retry);
4027 return err;
4028}
4029
4030static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4031{
4032 int error;
4033
4034 nfs_fattr_init(fsinfo->fattr);
4035 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4036 if (error == 0) {
4037 /* block layout checks this! */
4038 server->pnfs_blksize = fsinfo->blksize;
4039 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4040 }
4041
4042 return error;
4043}
4044
4045static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4046 struct nfs_pathconf *pathconf)
4047{
4048 struct nfs4_pathconf_arg args = {
4049 .fh = fhandle,
4050 .bitmask = server->attr_bitmask,
4051 };
4052 struct nfs4_pathconf_res res = {
4053 .pathconf = pathconf,
4054 };
4055 struct rpc_message msg = {
4056 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4057 .rpc_argp = &args,
4058 .rpc_resp = &res,
4059 };
4060
4061 /* None of the pathconf attributes are mandatory to implement */
4062 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4063 memset(pathconf, 0, sizeof(*pathconf));
4064 return 0;
4065 }
4066
4067 nfs_fattr_init(pathconf->fattr);
4068 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4069}
4070
4071static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4072 struct nfs_pathconf *pathconf)
4073{
4074 struct nfs4_exception exception = { };
4075 int err;
4076
4077 do {
4078 err = nfs4_handle_exception(server,
4079 _nfs4_proc_pathconf(server, fhandle, pathconf),
4080 &exception);
4081 } while (exception.retry);
4082 return err;
4083}
4084
4085int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4086 const struct nfs_open_context *ctx,
4087 const struct nfs_lock_context *l_ctx,
4088 fmode_t fmode)
4089{
4090 const struct nfs_lockowner *lockowner = NULL;
4091
4092 if (l_ctx != NULL)
4093 lockowner = &l_ctx->lockowner;
4094 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4095}
4096EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4097
4098static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4099 const struct nfs_open_context *ctx,
4100 const struct nfs_lock_context *l_ctx,
4101 fmode_t fmode)
4102{
4103 nfs4_stateid current_stateid;
4104
4105 /* If the current stateid represents a lost lock, then exit */
4106 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4107 return true;
4108 return nfs4_stateid_match(stateid, &current_stateid);
4109}
4110
4111static bool nfs4_error_stateid_expired(int err)
4112{
4113 switch (err) {
4114 case -NFS4ERR_DELEG_REVOKED:
4115 case -NFS4ERR_ADMIN_REVOKED:
4116 case -NFS4ERR_BAD_STATEID:
4117 case -NFS4ERR_STALE_STATEID:
4118 case -NFS4ERR_OLD_STATEID:
4119 case -NFS4ERR_OPENMODE:
4120 case -NFS4ERR_EXPIRED:
4121 return true;
4122 }
4123 return false;
4124}
4125
4126void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4127{
4128 nfs_invalidate_atime(hdr->inode);
4129}
4130
4131static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4132{
4133 struct nfs_server *server = NFS_SERVER(hdr->inode);
4134
4135 trace_nfs4_read(hdr, task->tk_status);
4136 if (nfs4_async_handle_error(task, server,
4137 hdr->args.context->state,
4138 NULL) == -EAGAIN) {
4139 rpc_restart_call_prepare(task);
4140 return -EAGAIN;
4141 }
4142
4143 __nfs4_read_done_cb(hdr);
4144 if (task->tk_status > 0)
4145 renew_lease(server, hdr->timestamp);
4146 return 0;
4147}
4148
4149static bool nfs4_read_stateid_changed(struct rpc_task *task,
4150 struct nfs_pgio_args *args)
4151{
4152
4153 if (!nfs4_error_stateid_expired(task->tk_status) ||
4154 nfs4_stateid_is_current(&args->stateid,
4155 args->context,
4156 args->lock_context,
4157 FMODE_READ))
4158 return false;
4159 rpc_restart_call_prepare(task);
4160 return true;
4161}
4162
4163static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4164{
4165
4166 dprintk("--> %s\n", __func__);
4167
4168 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4169 return -EAGAIN;
4170 if (nfs4_read_stateid_changed(task, &hdr->args))
4171 return -EAGAIN;
4172 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4173 nfs4_read_done_cb(task, hdr);
4174}
4175
4176static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4177 struct rpc_message *msg)
4178{
4179 hdr->timestamp = jiffies;
4180 hdr->pgio_done_cb = nfs4_read_done_cb;
4181 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4182 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4183}
4184
4185static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4186 struct nfs_pgio_header *hdr)
4187{
4188 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4189 &hdr->args.seq_args,
4190 &hdr->res.seq_res,
4191 task))
4192 return 0;
4193 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4194 hdr->args.lock_context,
4195 hdr->rw_ops->rw_mode) == -EIO)
4196 return -EIO;
4197 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4198 return -EIO;
4199 return 0;
4200}
4201
4202static int nfs4_write_done_cb(struct rpc_task *task,
4203 struct nfs_pgio_header *hdr)
4204{
4205 struct inode *inode = hdr->inode;
4206
4207 trace_nfs4_write(hdr, task->tk_status);
4208 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4209 hdr->args.context->state,
4210 NULL) == -EAGAIN) {
4211 rpc_restart_call_prepare(task);
4212 return -EAGAIN;
4213 }
4214 if (task->tk_status >= 0) {
4215 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4216 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4217 }
4218 return 0;
4219}
4220
4221static bool nfs4_write_stateid_changed(struct rpc_task *task,
4222 struct nfs_pgio_args *args)
4223{
4224
4225 if (!nfs4_error_stateid_expired(task->tk_status) ||
4226 nfs4_stateid_is_current(&args->stateid,
4227 args->context,
4228 args->lock_context,
4229 FMODE_WRITE))
4230 return false;
4231 rpc_restart_call_prepare(task);
4232 return true;
4233}
4234
4235static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4236{
4237 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4238 return -EAGAIN;
4239 if (nfs4_write_stateid_changed(task, &hdr->args))
4240 return -EAGAIN;
4241 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4242 nfs4_write_done_cb(task, hdr);
4243}
4244
4245static
4246bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4247{
4248 /* Don't request attributes for pNFS or O_DIRECT writes */
4249 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4250 return false;
4251 /* Otherwise, request attributes if and only if we don't hold
4252 * a delegation
4253 */
4254 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4255}
4256
4257static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4258 struct rpc_message *msg)
4259{
4260 struct nfs_server *server = NFS_SERVER(hdr->inode);
4261
4262 if (!nfs4_write_need_cache_consistency_data(hdr)) {
4263 hdr->args.bitmask = NULL;
4264 hdr->res.fattr = NULL;
4265 } else
4266 hdr->args.bitmask = server->cache_consistency_bitmask;
4267
4268 if (!hdr->pgio_done_cb)
4269 hdr->pgio_done_cb = nfs4_write_done_cb;
4270 hdr->res.server = server;
4271 hdr->timestamp = jiffies;
4272
4273 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4274 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4275}
4276
4277static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4278{
4279 nfs4_setup_sequence(NFS_SERVER(data->inode),
4280 &data->args.seq_args,
4281 &data->res.seq_res,
4282 task);
4283}
4284
4285static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4286{
4287 struct inode *inode = data->inode;
4288
4289 trace_nfs4_commit(data, task->tk_status);
4290 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4291 NULL, NULL) == -EAGAIN) {
4292 rpc_restart_call_prepare(task);
4293 return -EAGAIN;
4294 }
4295 return 0;
4296}
4297
4298static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4299{
4300 if (!nfs4_sequence_done(task, &data->res.seq_res))
4301 return -EAGAIN;
4302 return data->commit_done_cb(task, data);
4303}
4304
4305static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4306{
4307 struct nfs_server *server = NFS_SERVER(data->inode);
4308
4309 if (data->commit_done_cb == NULL)
4310 data->commit_done_cb = nfs4_commit_done_cb;
4311 data->res.server = server;
4312 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4313 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4314}
4315
4316struct nfs4_renewdata {
4317 struct nfs_client *client;
4318 unsigned long timestamp;
4319};
4320
4321/*
4322 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4323 * standalone procedure for queueing an asynchronous RENEW.
4324 */
4325static void nfs4_renew_release(void *calldata)
4326{
4327 struct nfs4_renewdata *data = calldata;
4328 struct nfs_client *clp = data->client;
4329
4330 if (atomic_read(&clp->cl_count) > 1)
4331 nfs4_schedule_state_renewal(clp);
4332 nfs_put_client(clp);
4333 kfree(data);
4334}
4335
4336static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4337{
4338 struct nfs4_renewdata *data = calldata;
4339 struct nfs_client *clp = data->client;
4340 unsigned long timestamp = data->timestamp;
4341
4342 trace_nfs4_renew_async(clp, task->tk_status);
4343 switch (task->tk_status) {
4344 case 0:
4345 break;
4346 case -NFS4ERR_LEASE_MOVED:
4347 nfs4_schedule_lease_moved_recovery(clp);
4348 break;
4349 default:
4350 /* Unless we're shutting down, schedule state recovery! */
4351 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4352 return;
4353 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4354 nfs4_schedule_lease_recovery(clp);
4355 return;
4356 }
4357 nfs4_schedule_path_down_recovery(clp);
4358 }
4359 do_renew_lease(clp, timestamp);
4360}
4361
4362static const struct rpc_call_ops nfs4_renew_ops = {
4363 .rpc_call_done = nfs4_renew_done,
4364 .rpc_release = nfs4_renew_release,
4365};
4366
4367static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4368{
4369 struct rpc_message msg = {
4370 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4371 .rpc_argp = clp,
4372 .rpc_cred = cred,
4373 };
4374 struct nfs4_renewdata *data;
4375
4376 if (renew_flags == 0)
4377 return 0;
4378 if (!atomic_inc_not_zero(&clp->cl_count))
4379 return -EIO;
4380 data = kmalloc(sizeof(*data), GFP_NOFS);
4381 if (data == NULL)
4382 return -ENOMEM;
4383 data->client = clp;
4384 data->timestamp = jiffies;
4385 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4386 &nfs4_renew_ops, data);
4387}
4388
4389static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4390{
4391 struct rpc_message msg = {
4392 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4393 .rpc_argp = clp,
4394 .rpc_cred = cred,
4395 };
4396 unsigned long now = jiffies;
4397 int status;
4398
4399 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4400 if (status < 0)
4401 return status;
4402 do_renew_lease(clp, now);
4403 return 0;
4404}
4405
4406static inline int nfs4_server_supports_acls(struct nfs_server *server)
4407{
4408 return server->caps & NFS_CAP_ACLS;
4409}
4410
4411/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4412 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4413 * the stack.
4414 */
4415#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4416
4417static int buf_to_pages_noslab(const void *buf, size_t buflen,
4418 struct page **pages, unsigned int *pgbase)
4419{
4420 struct page *newpage, **spages;
4421 int rc = 0;
4422 size_t len;
4423 spages = pages;
4424
4425 do {
4426 len = min_t(size_t, PAGE_SIZE, buflen);
4427 newpage = alloc_page(GFP_KERNEL);
4428
4429 if (newpage == NULL)
4430 goto unwind;
4431 memcpy(page_address(newpage), buf, len);
4432 buf += len;
4433 buflen -= len;
4434 *pages++ = newpage;
4435 rc++;
4436 } while (buflen != 0);
4437
4438 return rc;
4439
4440unwind:
4441 for(; rc > 0; rc--)
4442 __free_page(spages[rc-1]);
4443 return -ENOMEM;
4444}
4445
4446struct nfs4_cached_acl {
4447 int cached;
4448 size_t len;
4449 char data[0];
4450};
4451
4452static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4453{
4454 struct nfs_inode *nfsi = NFS_I(inode);
4455
4456 spin_lock(&inode->i_lock);
4457 kfree(nfsi->nfs4_acl);
4458 nfsi->nfs4_acl = acl;
4459 spin_unlock(&inode->i_lock);
4460}
4461
4462static void nfs4_zap_acl_attr(struct inode *inode)
4463{
4464 nfs4_set_cached_acl(inode, NULL);
4465}
4466
4467static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4468{
4469 struct nfs_inode *nfsi = NFS_I(inode);
4470 struct nfs4_cached_acl *acl;
4471 int ret = -ENOENT;
4472
4473 spin_lock(&inode->i_lock);
4474 acl = nfsi->nfs4_acl;
4475 if (acl == NULL)
4476 goto out;
4477 if (buf == NULL) /* user is just asking for length */
4478 goto out_len;
4479 if (acl->cached == 0)
4480 goto out;
4481 ret = -ERANGE; /* see getxattr(2) man page */
4482 if (acl->len > buflen)
4483 goto out;
4484 memcpy(buf, acl->data, acl->len);
4485out_len:
4486 ret = acl->len;
4487out:
4488 spin_unlock(&inode->i_lock);
4489 return ret;
4490}
4491
4492static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4493{
4494 struct nfs4_cached_acl *acl;
4495 size_t buflen = sizeof(*acl) + acl_len;
4496
4497 if (buflen <= PAGE_SIZE) {
4498 acl = kmalloc(buflen, GFP_KERNEL);
4499 if (acl == NULL)
4500 goto out;
4501 acl->cached = 1;
4502 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4503 } else {
4504 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4505 if (acl == NULL)
4506 goto out;
4507 acl->cached = 0;
4508 }
4509 acl->len = acl_len;
4510out:
4511 nfs4_set_cached_acl(inode, acl);
4512}
4513
4514/*
4515 * The getxattr API returns the required buffer length when called with a
4516 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4517 * the required buf. On a NULL buf, we send a page of data to the server
4518 * guessing that the ACL request can be serviced by a page. If so, we cache
4519 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4520 * the cache. If not so, we throw away the page, and cache the required
4521 * length. The next getxattr call will then produce another round trip to
4522 * the server, this time with the input buf of the required size.
4523 */
4524static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4525{
4526 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4527 struct nfs_getaclargs args = {
4528 .fh = NFS_FH(inode),
4529 .acl_pages = pages,
4530 .acl_len = buflen,
4531 };
4532 struct nfs_getaclres res = {
4533 .acl_len = buflen,
4534 };
4535 struct rpc_message msg = {
4536 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4537 .rpc_argp = &args,
4538 .rpc_resp = &res,
4539 };
4540 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4541 int ret = -ENOMEM, i;
4542
4543 /* As long as we're doing a round trip to the server anyway,
4544 * let's be prepared for a page of acl data. */
4545 if (npages == 0)
4546 npages = 1;
4547 if (npages > ARRAY_SIZE(pages))
4548 return -ERANGE;
4549
4550 for (i = 0; i < npages; i++) {
4551 pages[i] = alloc_page(GFP_KERNEL);
4552 if (!pages[i])
4553 goto out_free;
4554 }
4555
4556 /* for decoding across pages */
4557 res.acl_scratch = alloc_page(GFP_KERNEL);
4558 if (!res.acl_scratch)
4559 goto out_free;
4560
4561 args.acl_len = npages * PAGE_SIZE;
4562 args.acl_pgbase = 0;
4563
4564 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4565 __func__, buf, buflen, npages, args.acl_len);
4566 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4567 &msg, &args.seq_args, &res.seq_res, 0);
4568 if (ret)
4569 goto out_free;
4570
4571 /* Handle the case where the passed-in buffer is too short */
4572 if (res.acl_flags & NFS4_ACL_TRUNC) {
4573 /* Did the user only issue a request for the acl length? */
4574 if (buf == NULL)
4575 goto out_ok;
4576 ret = -ERANGE;
4577 goto out_free;
4578 }
4579 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4580 if (buf) {
4581 if (res.acl_len > buflen) {
4582 ret = -ERANGE;
4583 goto out_free;
4584 }
4585 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4586 }
4587out_ok:
4588 ret = res.acl_len;
4589out_free:
4590 for (i = 0; i < npages; i++)
4591 if (pages[i])
4592 __free_page(pages[i]);
4593 if (res.acl_scratch)
4594 __free_page(res.acl_scratch);
4595 return ret;
4596}
4597
4598static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4599{
4600 struct nfs4_exception exception = { };
4601 ssize_t ret;
4602 do {
4603 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4604 trace_nfs4_get_acl(inode, ret);
4605 if (ret >= 0)
4606 break;
4607 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4608 } while (exception.retry);
4609 return ret;
4610}
4611
4612static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4613{
4614 struct nfs_server *server = NFS_SERVER(inode);
4615 int ret;
4616
4617 if (!nfs4_server_supports_acls(server))
4618 return -EOPNOTSUPP;
4619 ret = nfs_revalidate_inode(server, inode);
4620 if (ret < 0)
4621 return ret;
4622 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4623 nfs_zap_acl_cache(inode);
4624 ret = nfs4_read_cached_acl(inode, buf, buflen);
4625 if (ret != -ENOENT)
4626 /* -ENOENT is returned if there is no ACL or if there is an ACL
4627 * but no cached acl data, just the acl length */
4628 return ret;
4629 return nfs4_get_acl_uncached(inode, buf, buflen);
4630}
4631
4632static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4633{
4634 struct nfs_server *server = NFS_SERVER(inode);
4635 struct page *pages[NFS4ACL_MAXPAGES];
4636 struct nfs_setaclargs arg = {
4637 .fh = NFS_FH(inode),
4638 .acl_pages = pages,
4639 .acl_len = buflen,
4640 };
4641 struct nfs_setaclres res;
4642 struct rpc_message msg = {
4643 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4644 .rpc_argp = &arg,
4645 .rpc_resp = &res,
4646 };
4647 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4648 int ret, i;
4649
4650 if (!nfs4_server_supports_acls(server))
4651 return -EOPNOTSUPP;
4652 if (npages > ARRAY_SIZE(pages))
4653 return -ERANGE;
4654 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4655 if (i < 0)
4656 return i;
4657 nfs4_inode_return_delegation(inode);
4658 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4659
4660 /*
4661 * Free each page after tx, so the only ref left is
4662 * held by the network stack
4663 */
4664 for (; i > 0; i--)
4665 put_page(pages[i-1]);
4666
4667 /*
4668 * Acl update can result in inode attribute update.
4669 * so mark the attribute cache invalid.
4670 */
4671 spin_lock(&inode->i_lock);
4672 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4673 spin_unlock(&inode->i_lock);
4674 nfs_access_zap_cache(inode);
4675 nfs_zap_acl_cache(inode);
4676 return ret;
4677}
4678
4679static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4680{
4681 struct nfs4_exception exception = { };
4682 int err;
4683 do {
4684 err = __nfs4_proc_set_acl(inode, buf, buflen);
4685 trace_nfs4_set_acl(inode, err);
4686 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4687 &exception);
4688 } while (exception.retry);
4689 return err;
4690}
4691
4692#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4693static int _nfs4_get_security_label(struct inode *inode, void *buf,
4694 size_t buflen)
4695{
4696 struct nfs_server *server = NFS_SERVER(inode);
4697 struct nfs_fattr fattr;
4698 struct nfs4_label label = {0, 0, buflen, buf};
4699
4700 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4701 struct nfs4_getattr_arg arg = {
4702 .fh = NFS_FH(inode),
4703 .bitmask = bitmask,
4704 };
4705 struct nfs4_getattr_res res = {
4706 .fattr = &fattr,
4707 .label = &label,
4708 .server = server,
4709 };
4710 struct rpc_message msg = {
4711 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4712 .rpc_argp = &arg,
4713 .rpc_resp = &res,
4714 };
4715 int ret;
4716
4717 nfs_fattr_init(&fattr);
4718
4719 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4720 if (ret)
4721 return ret;
4722 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4723 return -ENOENT;
4724 if (buflen < label.len)
4725 return -ERANGE;
4726 return 0;
4727}
4728
4729static int nfs4_get_security_label(struct inode *inode, void *buf,
4730 size_t buflen)
4731{
4732 struct nfs4_exception exception = { };
4733 int err;
4734
4735 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4736 return -EOPNOTSUPP;
4737
4738 do {
4739 err = _nfs4_get_security_label(inode, buf, buflen);
4740 trace_nfs4_get_security_label(inode, err);
4741 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4742 &exception);
4743 } while (exception.retry);
4744 return err;
4745}
4746
4747static int _nfs4_do_set_security_label(struct inode *inode,
4748 struct nfs4_label *ilabel,
4749 struct nfs_fattr *fattr,
4750 struct nfs4_label *olabel)
4751{
4752
4753 struct iattr sattr = {0};
4754 struct nfs_server *server = NFS_SERVER(inode);
4755 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4756 struct nfs_setattrargs arg = {
4757 .fh = NFS_FH(inode),
4758 .iap = &sattr,
4759 .server = server,
4760 .bitmask = bitmask,
4761 .label = ilabel,
4762 };
4763 struct nfs_setattrres res = {
4764 .fattr = fattr,
4765 .label = olabel,
4766 .server = server,
4767 };
4768 struct rpc_message msg = {
4769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4770 .rpc_argp = &arg,
4771 .rpc_resp = &res,
4772 };
4773 int status;
4774
4775 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4776
4777 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4778 if (status)
4779 dprintk("%s failed: %d\n", __func__, status);
4780
4781 return status;
4782}
4783
4784static int nfs4_do_set_security_label(struct inode *inode,
4785 struct nfs4_label *ilabel,
4786 struct nfs_fattr *fattr,
4787 struct nfs4_label *olabel)
4788{
4789 struct nfs4_exception exception = { };
4790 int err;
4791
4792 do {
4793 err = _nfs4_do_set_security_label(inode, ilabel,
4794 fattr, olabel);
4795 trace_nfs4_set_security_label(inode, err);
4796 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4797 &exception);
4798 } while (exception.retry);
4799 return err;
4800}
4801
4802static int
4803nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4804{
4805 struct nfs4_label ilabel, *olabel = NULL;
4806 struct nfs_fattr fattr;
4807 struct rpc_cred *cred;
4808 struct inode *inode = dentry->d_inode;
4809 int status;
4810
4811 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4812 return -EOPNOTSUPP;
4813
4814 nfs_fattr_init(&fattr);
4815
4816 ilabel.pi = 0;
4817 ilabel.lfs = 0;
4818 ilabel.label = (char *)buf;
4819 ilabel.len = buflen;
4820
4821 cred = rpc_lookup_cred();
4822 if (IS_ERR(cred))
4823 return PTR_ERR(cred);
4824
4825 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4826 if (IS_ERR(olabel)) {
4827 status = -PTR_ERR(olabel);
4828 goto out;
4829 }
4830
4831 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4832 if (status == 0)
4833 nfs_setsecurity(inode, &fattr, olabel);
4834
4835 nfs4_label_free(olabel);
4836out:
4837 put_rpccred(cred);
4838 return status;
4839}
4840#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4841
4842
4843static int
4844nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4845 struct nfs4_state *state, long *timeout)
4846{
4847 struct nfs_client *clp = server->nfs_client;
4848
4849 if (task->tk_status >= 0)
4850 return 0;
4851 switch(task->tk_status) {
4852 case -NFS4ERR_DELEG_REVOKED:
4853 case -NFS4ERR_ADMIN_REVOKED:
4854 case -NFS4ERR_BAD_STATEID:
4855 if (state == NULL)
4856 break;
4857 nfs_remove_bad_delegation(state->inode);
4858 case -NFS4ERR_OPENMODE:
4859 if (state == NULL)
4860 break;
4861 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4862 goto recovery_failed;
4863 goto wait_on_recovery;
4864 case -NFS4ERR_EXPIRED:
4865 if (state != NULL) {
4866 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4867 goto recovery_failed;
4868 }
4869 case -NFS4ERR_STALE_STATEID:
4870 case -NFS4ERR_STALE_CLIENTID:
4871 nfs4_schedule_lease_recovery(clp);
4872 goto wait_on_recovery;
4873 case -NFS4ERR_MOVED:
4874 if (nfs4_schedule_migration_recovery(server) < 0)
4875 goto recovery_failed;
4876 goto wait_on_recovery;
4877 case -NFS4ERR_LEASE_MOVED:
4878 nfs4_schedule_lease_moved_recovery(clp);
4879 goto wait_on_recovery;
4880#if defined(CONFIG_NFS_V4_1)
4881 case -NFS4ERR_BADSESSION:
4882 case -NFS4ERR_BADSLOT:
4883 case -NFS4ERR_BAD_HIGH_SLOT:
4884 case -NFS4ERR_DEADSESSION:
4885 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4886 case -NFS4ERR_SEQ_FALSE_RETRY:
4887 case -NFS4ERR_SEQ_MISORDERED:
4888 dprintk("%s ERROR %d, Reset session\n", __func__,
4889 task->tk_status);
4890 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4891 goto wait_on_recovery;
4892#endif /* CONFIG_NFS_V4_1 */
4893 case -NFS4ERR_DELAY:
4894 nfs_inc_server_stats(server, NFSIOS_DELAY);
4895 rpc_delay(task, nfs4_update_delay(timeout));
4896 goto restart_call;
4897 case -NFS4ERR_GRACE:
4898 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4899 case -NFS4ERR_RETRY_UNCACHED_REP:
4900 case -NFS4ERR_OLD_STATEID:
4901 goto restart_call;
4902 }
4903 task->tk_status = nfs4_map_errors(task->tk_status);
4904 return 0;
4905recovery_failed:
4906 task->tk_status = -EIO;
4907 return 0;
4908wait_on_recovery:
4909 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4910 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4911 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4912 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4913 goto recovery_failed;
4914restart_call:
4915 task->tk_status = 0;
4916 return -EAGAIN;
4917}
4918
4919static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4920 nfs4_verifier *bootverf)
4921{
4922 __be32 verf[2];
4923
4924 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4925 /* An impossible timestamp guarantees this value
4926 * will never match a generated boot time. */
4927 verf[0] = 0;
4928 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4929 } else {
4930 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4931 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4932 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4933 }
4934 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4935}
4936
4937static unsigned int
4938nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4939 char *buf, size_t len)
4940{
4941 unsigned int result;
4942
4943 rcu_read_lock();
4944 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4945 clp->cl_ipaddr,
4946 rpc_peeraddr2str(clp->cl_rpcclient,
4947 RPC_DISPLAY_ADDR),
4948 rpc_peeraddr2str(clp->cl_rpcclient,
4949 RPC_DISPLAY_PROTO));
4950 rcu_read_unlock();
4951 return result;
4952}
4953
4954static unsigned int
4955nfs4_init_uniform_client_string(const struct nfs_client *clp,
4956 char *buf, size_t len)
4957{
4958 const char *nodename = clp->cl_rpcclient->cl_nodename;
4959
4960 if (nfs4_client_id_uniquifier[0] != '\0')
4961 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4962 clp->rpc_ops->version,
4963 clp->cl_minorversion,
4964 nfs4_client_id_uniquifier,
4965 nodename);
4966 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4967 clp->rpc_ops->version, clp->cl_minorversion,
4968 nodename);
4969}
4970
4971/*
4972 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4973 * services. Advertise one based on the address family of the
4974 * clientaddr.
4975 */
4976static unsigned int
4977nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4978{
4979 if (strchr(clp->cl_ipaddr, ':') != NULL)
4980 return scnprintf(buf, len, "tcp6");
4981 else
4982 return scnprintf(buf, len, "tcp");
4983}
4984
4985static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4986{
4987 struct nfs4_setclientid *sc = calldata;
4988
4989 if (task->tk_status == 0)
4990 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4991}
4992
4993static const struct rpc_call_ops nfs4_setclientid_ops = {
4994 .rpc_call_done = nfs4_setclientid_done,
4995};
4996
4997/**
4998 * nfs4_proc_setclientid - Negotiate client ID
4999 * @clp: state data structure
5000 * @program: RPC program for NFSv4 callback service
5001 * @port: IP port number for NFS4 callback service
5002 * @cred: RPC credential to use for this call
5003 * @res: where to place the result
5004 *
5005 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5006 */
5007int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5008 unsigned short port, struct rpc_cred *cred,
5009 struct nfs4_setclientid_res *res)
5010{
5011 nfs4_verifier sc_verifier;
5012 struct nfs4_setclientid setclientid = {
5013 .sc_verifier = &sc_verifier,
5014 .sc_prog = program,
5015 .sc_cb_ident = clp->cl_cb_ident,
5016 };
5017 struct rpc_message msg = {
5018 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5019 .rpc_argp = &setclientid,
5020 .rpc_resp = res,
5021 .rpc_cred = cred,
5022 };
5023 struct rpc_task *task;
5024 struct rpc_task_setup task_setup_data = {
5025 .rpc_client = clp->cl_rpcclient,
5026 .rpc_message = &msg,
5027 .callback_ops = &nfs4_setclientid_ops,
5028 .callback_data = &setclientid,
5029 .flags = RPC_TASK_TIMEOUT,
5030 };
5031 int status;
5032
5033 /* nfs_client_id4 */
5034 nfs4_init_boot_verifier(clp, &sc_verifier);
5035 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5036 setclientid.sc_name_len =
5037 nfs4_init_uniform_client_string(clp,
5038 setclientid.sc_name,
5039 sizeof(setclientid.sc_name));
5040 else
5041 setclientid.sc_name_len =
5042 nfs4_init_nonuniform_client_string(clp,
5043 setclientid.sc_name,
5044 sizeof(setclientid.sc_name));
5045 /* cb_client4 */
5046 setclientid.sc_netid_len =
5047 nfs4_init_callback_netid(clp,
5048 setclientid.sc_netid,
5049 sizeof(setclientid.sc_netid));
5050 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5051 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5052 clp->cl_ipaddr, port >> 8, port & 255);
5053
5054 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
5055 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5056 setclientid.sc_name_len, setclientid.sc_name);
5057 task = rpc_run_task(&task_setup_data);
5058 if (IS_ERR(task)) {
5059 status = PTR_ERR(task);
5060 goto out;
5061 }
5062 status = task->tk_status;
5063 if (setclientid.sc_cred) {
5064 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5065 put_rpccred(setclientid.sc_cred);
5066 }
5067 rpc_put_task(task);
5068out:
5069 trace_nfs4_setclientid(clp, status);
5070 dprintk("NFS reply setclientid: %d\n", status);
5071 return status;
5072}
5073
5074/**
5075 * nfs4_proc_setclientid_confirm - Confirm client ID
5076 * @clp: state data structure
5077 * @res: result of a previous SETCLIENTID
5078 * @cred: RPC credential to use for this call
5079 *
5080 * Returns zero, a negative errno, or a negative NFS4ERR status code.
5081 */
5082int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5083 struct nfs4_setclientid_res *arg,
5084 struct rpc_cred *cred)
5085{
5086 struct rpc_message msg = {
5087 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5088 .rpc_argp = arg,
5089 .rpc_cred = cred,
5090 };
5091 int status;
5092
5093 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
5094 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5095 clp->cl_clientid);
5096 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5097 trace_nfs4_setclientid_confirm(clp, status);
5098 dprintk("NFS reply setclientid_confirm: %d\n", status);
5099 return status;
5100}
5101
5102struct nfs4_delegreturndata {
5103 struct nfs4_delegreturnargs args;
5104 struct nfs4_delegreturnres res;
5105 struct nfs_fh fh;
5106 nfs4_stateid stateid;
5107 unsigned long timestamp;
5108 struct nfs_fattr fattr;
5109 int rpc_status;
5110 struct inode *inode;
5111 bool roc;
5112 u32 roc_barrier;
5113};
5114
5115static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5116{
5117 struct nfs4_delegreturndata *data = calldata;
5118
5119 if (!nfs4_sequence_done(task, &data->res.seq_res))
5120 return;
5121
5122 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5123 switch (task->tk_status) {
5124 case 0:
5125 renew_lease(data->res.server, data->timestamp);
5126 case -NFS4ERR_ADMIN_REVOKED:
5127 case -NFS4ERR_DELEG_REVOKED:
5128 case -NFS4ERR_BAD_STATEID:
5129 case -NFS4ERR_OLD_STATEID:
5130 case -NFS4ERR_STALE_STATEID:
5131 case -NFS4ERR_EXPIRED:
5132 task->tk_status = 0;
5133 if (data->roc)
5134 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5135 break;
5136 default:
5137 if (nfs4_async_handle_error(task, data->res.server,
5138 NULL, NULL) == -EAGAIN) {
5139 rpc_restart_call_prepare(task);
5140 return;
5141 }
5142 }
5143 data->rpc_status = task->tk_status;
5144}
5145
5146static void nfs4_delegreturn_release(void *calldata)
5147{
5148 struct nfs4_delegreturndata *data = calldata;
5149
5150 if (data->roc)
5151 pnfs_roc_release(data->inode);
5152 kfree(calldata);
5153}
5154
5155static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5156{
5157 struct nfs4_delegreturndata *d_data;
5158
5159 d_data = (struct nfs4_delegreturndata *)data;
5160
5161 if (d_data->roc &&
5162 pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5163 return;
5164
5165 nfs4_setup_sequence(d_data->res.server,
5166 &d_data->args.seq_args,
5167 &d_data->res.seq_res,
5168 task);
5169}
5170
5171static const struct rpc_call_ops nfs4_delegreturn_ops = {
5172 .rpc_call_prepare = nfs4_delegreturn_prepare,
5173 .rpc_call_done = nfs4_delegreturn_done,
5174 .rpc_release = nfs4_delegreturn_release,
5175};
5176
5177static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5178{
5179 struct nfs4_delegreturndata *data;
5180 struct nfs_server *server = NFS_SERVER(inode);
5181 struct rpc_task *task;
5182 struct rpc_message msg = {
5183 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5184 .rpc_cred = cred,
5185 };
5186 struct rpc_task_setup task_setup_data = {
5187 .rpc_client = server->client,
5188 .rpc_message = &msg,
5189 .callback_ops = &nfs4_delegreturn_ops,
5190 .flags = RPC_TASK_ASYNC,
5191 };
5192 int status = 0;
5193
5194 data = kzalloc(sizeof(*data), GFP_NOFS);
5195 if (data == NULL)
5196 return -ENOMEM;
5197 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5198 data->args.fhandle = &data->fh;
5199 data->args.stateid = &data->stateid;
5200 data->args.bitmask = server->cache_consistency_bitmask;
5201 nfs_copy_fh(&data->fh, NFS_FH(inode));
5202 nfs4_stateid_copy(&data->stateid, stateid);
5203 data->res.fattr = &data->fattr;
5204 data->res.server = server;
5205 nfs_fattr_init(data->res.fattr);
5206 data->timestamp = jiffies;
5207 data->rpc_status = 0;
5208 data->inode = inode;
5209 data->roc = list_empty(&NFS_I(inode)->open_files) ?
5210 pnfs_roc(inode) : false;
5211
5212 task_setup_data.callback_data = data;
5213 msg.rpc_argp = &data->args;
5214 msg.rpc_resp = &data->res;
5215 task = rpc_run_task(&task_setup_data);
5216 if (IS_ERR(task))
5217 return PTR_ERR(task);
5218 if (!issync)
5219 goto out;
5220 status = nfs4_wait_for_completion_rpc_task(task);
5221 if (status != 0)
5222 goto out;
5223 status = data->rpc_status;
5224 if (status == 0)
5225 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5226 else
5227 nfs_refresh_inode(inode, &data->fattr);
5228out:
5229 rpc_put_task(task);
5230 return status;
5231}
5232
5233int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5234{
5235 struct nfs_server *server = NFS_SERVER(inode);
5236 struct nfs4_exception exception = { };
5237 int err;
5238 do {
5239 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5240 trace_nfs4_delegreturn(inode, err);
5241 switch (err) {
5242 case -NFS4ERR_STALE_STATEID:
5243 case -NFS4ERR_EXPIRED:
5244 case 0:
5245 return 0;
5246 }
5247 err = nfs4_handle_exception(server, err, &exception);
5248 } while (exception.retry);
5249 return err;
5250}
5251
5252#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5253#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5254
5255/*
5256 * sleep, with exponential backoff, and retry the LOCK operation.
5257 */
5258static unsigned long
5259nfs4_set_lock_task_retry(unsigned long timeout)
5260{
5261 freezable_schedule_timeout_killable_unsafe(timeout);
5262 timeout <<= 1;
5263 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5264 return NFS4_LOCK_MAXTIMEOUT;
5265 return timeout;
5266}
5267
5268static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5269{
5270 struct inode *inode = state->inode;
5271 struct nfs_server *server = NFS_SERVER(inode);
5272 struct nfs_client *clp = server->nfs_client;
5273 struct nfs_lockt_args arg = {
5274 .fh = NFS_FH(inode),
5275 .fl = request,
5276 };
5277 struct nfs_lockt_res res = {
5278 .denied = request,
5279 };
5280 struct rpc_message msg = {
5281 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5282 .rpc_argp = &arg,
5283 .rpc_resp = &res,
5284 .rpc_cred = state->owner->so_cred,
5285 };
5286 struct nfs4_lock_state *lsp;
5287 int status;
5288
5289 arg.lock_owner.clientid = clp->cl_clientid;
5290 status = nfs4_set_lock_state(state, request);
5291 if (status != 0)
5292 goto out;
5293 lsp = request->fl_u.nfs4_fl.owner;
5294 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5295 arg.lock_owner.s_dev = server->s_dev;
5296 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5297 switch (status) {
5298 case 0:
5299 request->fl_type = F_UNLCK;
5300 break;
5301 case -NFS4ERR_DENIED:
5302 status = 0;
5303 }
5304 request->fl_ops->fl_release_private(request);
5305 request->fl_ops = NULL;
5306out:
5307 return status;
5308}
5309
5310static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5311{
5312 struct nfs4_exception exception = { };
5313 int err;
5314
5315 do {
5316 err = _nfs4_proc_getlk(state, cmd, request);
5317 trace_nfs4_get_lock(request, state, cmd, err);
5318 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5319 &exception);
5320 } while (exception.retry);
5321 return err;
5322}
5323
5324static int do_vfs_lock(struct file *file, struct file_lock *fl)
5325{
5326 int res = 0;
5327 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5328 case FL_POSIX:
5329 res = posix_lock_file_wait(file, fl);
5330 break;
5331 case FL_FLOCK:
5332 res = flock_lock_file_wait(file, fl);
5333 break;
5334 default:
5335 BUG();
5336 }
5337 return res;
5338}
5339
5340struct nfs4_unlockdata {
5341 struct nfs_locku_args arg;
5342 struct nfs_locku_res res;
5343 struct nfs4_lock_state *lsp;
5344 struct nfs_open_context *ctx;
5345 struct file_lock fl;
5346 const struct nfs_server *server;
5347 unsigned long timestamp;
5348};
5349
5350static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5351 struct nfs_open_context *ctx,
5352 struct nfs4_lock_state *lsp,
5353 struct nfs_seqid *seqid)
5354{
5355 struct nfs4_unlockdata *p;
5356 struct inode *inode = lsp->ls_state->inode;
5357
5358 p = kzalloc(sizeof(*p), GFP_NOFS);
5359 if (p == NULL)
5360 return NULL;
5361 p->arg.fh = NFS_FH(inode);
5362 p->arg.fl = &p->fl;
5363 p->arg.seqid = seqid;
5364 p->res.seqid = seqid;
5365 p->arg.stateid = &lsp->ls_stateid;
5366 p->lsp = lsp;
5367 atomic_inc(&lsp->ls_count);
5368 /* Ensure we don't close file until we're done freeing locks! */
5369 p->ctx = get_nfs_open_context(ctx);
5370 memcpy(&p->fl, fl, sizeof(p->fl));
5371 p->server = NFS_SERVER(inode);
5372 return p;
5373}
5374
5375static void nfs4_locku_release_calldata(void *data)
5376{
5377 struct nfs4_unlockdata *calldata = data;
5378 nfs_free_seqid(calldata->arg.seqid);
5379 nfs4_put_lock_state(calldata->lsp);
5380 put_nfs_open_context(calldata->ctx);
5381 kfree(calldata);
5382}
5383
5384static void nfs4_locku_done(struct rpc_task *task, void *data)
5385{
5386 struct nfs4_unlockdata *calldata = data;
5387
5388 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5389 return;
5390 switch (task->tk_status) {
5391 case 0:
5392 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5393 &calldata->res.stateid);
5394 renew_lease(calldata->server, calldata->timestamp);
5395 break;
5396 case -NFS4ERR_BAD_STATEID:
5397 case -NFS4ERR_OLD_STATEID:
5398 case -NFS4ERR_STALE_STATEID:
5399 case -NFS4ERR_EXPIRED:
5400 break;
5401 default:
5402 if (nfs4_async_handle_error(task, calldata->server,
5403 NULL, NULL) == -EAGAIN)
5404 rpc_restart_call_prepare(task);
5405 }
5406 nfs_release_seqid(calldata->arg.seqid);
5407}
5408
5409static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5410{
5411 struct nfs4_unlockdata *calldata = data;
5412
5413 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5414 goto out_wait;
5415 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5416 /* Note: exit _without_ running nfs4_locku_done */
5417 goto out_no_action;
5418 }
5419 calldata->timestamp = jiffies;
5420 if (nfs4_setup_sequence(calldata->server,
5421 &calldata->arg.seq_args,
5422 &calldata->res.seq_res,
5423 task) != 0)
5424 nfs_release_seqid(calldata->arg.seqid);
5425 return;
5426out_no_action:
5427 task->tk_action = NULL;
5428out_wait:
5429 nfs4_sequence_done(task, &calldata->res.seq_res);
5430}
5431
5432static const struct rpc_call_ops nfs4_locku_ops = {
5433 .rpc_call_prepare = nfs4_locku_prepare,
5434 .rpc_call_done = nfs4_locku_done,
5435 .rpc_release = nfs4_locku_release_calldata,
5436};
5437
5438static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5439 struct nfs_open_context *ctx,
5440 struct nfs4_lock_state *lsp,
5441 struct nfs_seqid *seqid)
5442{
5443 struct nfs4_unlockdata *data;
5444 struct rpc_message msg = {
5445 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5446 .rpc_cred = ctx->cred,
5447 };
5448 struct rpc_task_setup task_setup_data = {
5449 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5450 .rpc_message = &msg,
5451 .callback_ops = &nfs4_locku_ops,
5452 .workqueue = nfsiod_workqueue,
5453 .flags = RPC_TASK_ASYNC,
5454 };
5455
5456 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5457 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5458
5459 /* Ensure this is an unlock - when canceling a lock, the
5460 * canceled lock is passed in, and it won't be an unlock.
5461 */
5462 fl->fl_type = F_UNLCK;
5463
5464 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5465 if (data == NULL) {
5466 nfs_free_seqid(seqid);
5467 return ERR_PTR(-ENOMEM);
5468 }
5469
5470 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5471 msg.rpc_argp = &data->arg;
5472 msg.rpc_resp = &data->res;
5473 task_setup_data.callback_data = data;
5474 return rpc_run_task(&task_setup_data);
5475}
5476
5477static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5478{
5479 struct inode *inode = state->inode;
5480 struct nfs4_state_owner *sp = state->owner;
5481 struct nfs_inode *nfsi = NFS_I(inode);
5482 struct nfs_seqid *seqid;
5483 struct nfs4_lock_state *lsp;
5484 struct rpc_task *task;
5485 int status = 0;
5486 unsigned char fl_flags = request->fl_flags;
5487
5488 status = nfs4_set_lock_state(state, request);
5489 /* Unlock _before_ we do the RPC call */
5490 request->fl_flags |= FL_EXISTS;
5491 /* Exclude nfs_delegation_claim_locks() */
5492 mutex_lock(&sp->so_delegreturn_mutex);
5493 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5494 down_read(&nfsi->rwsem);
5495 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5496 up_read(&nfsi->rwsem);
5497 mutex_unlock(&sp->so_delegreturn_mutex);
5498 goto out;
5499 }
5500 up_read(&nfsi->rwsem);
5501 mutex_unlock(&sp->so_delegreturn_mutex);
5502 if (status != 0)
5503 goto out;
5504 /* Is this a delegated lock? */
5505 lsp = request->fl_u.nfs4_fl.owner;
5506 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5507 goto out;
5508 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5509 status = -ENOMEM;
5510 if (seqid == NULL)
5511 goto out;
5512 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5513 status = PTR_ERR(task);
5514 if (IS_ERR(task))
5515 goto out;
5516 status = nfs4_wait_for_completion_rpc_task(task);
5517 rpc_put_task(task);
5518out:
5519 request->fl_flags = fl_flags;
5520 trace_nfs4_unlock(request, state, F_SETLK, status);
5521 return status;
5522}
5523
5524struct nfs4_lockdata {
5525 struct nfs_lock_args arg;
5526 struct nfs_lock_res res;
5527 struct nfs4_lock_state *lsp;
5528 struct nfs_open_context *ctx;
5529 struct file_lock fl;
5530 unsigned long timestamp;
5531 int rpc_status;
5532 int cancelled;
5533 struct nfs_server *server;
5534};
5535
5536static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5537 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5538 gfp_t gfp_mask)
5539{
5540 struct nfs4_lockdata *p;
5541 struct inode *inode = lsp->ls_state->inode;
5542 struct nfs_server *server = NFS_SERVER(inode);
5543
5544 p = kzalloc(sizeof(*p), gfp_mask);
5545 if (p == NULL)
5546 return NULL;
5547
5548 p->arg.fh = NFS_FH(inode);
5549 p->arg.fl = &p->fl;
5550 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5551 if (p->arg.open_seqid == NULL)
5552 goto out_free;
5553 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5554 if (p->arg.lock_seqid == NULL)
5555 goto out_free_seqid;
5556 p->arg.lock_stateid = &lsp->ls_stateid;
5557 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5558 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5559 p->arg.lock_owner.s_dev = server->s_dev;
5560 p->res.lock_seqid = p->arg.lock_seqid;
5561 p->lsp = lsp;
5562 p->server = server;
5563 atomic_inc(&lsp->ls_count);
5564 p->ctx = get_nfs_open_context(ctx);
5565 memcpy(&p->fl, fl, sizeof(p->fl));
5566 return p;
5567out_free_seqid:
5568 nfs_free_seqid(p->arg.open_seqid);
5569out_free:
5570 kfree(p);
5571 return NULL;
5572}
5573
5574static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5575{
5576 struct nfs4_lockdata *data = calldata;
5577 struct nfs4_state *state = data->lsp->ls_state;
5578
5579 dprintk("%s: begin!\n", __func__);
5580 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5581 goto out_wait;
5582 /* Do we need to do an open_to_lock_owner? */
5583 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5584 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5585 goto out_release_lock_seqid;
5586 }
5587 data->arg.open_stateid = &state->open_stateid;
5588 data->arg.new_lock_owner = 1;
5589 data->res.open_seqid = data->arg.open_seqid;
5590 } else
5591 data->arg.new_lock_owner = 0;
5592 if (!nfs4_valid_open_stateid(state)) {
5593 data->rpc_status = -EBADF;
5594 task->tk_action = NULL;
5595 goto out_release_open_seqid;
5596 }
5597 data->timestamp = jiffies;
5598 if (nfs4_setup_sequence(data->server,
5599 &data->arg.seq_args,
5600 &data->res.seq_res,
5601 task) == 0)
5602 return;
5603out_release_open_seqid:
5604 nfs_release_seqid(data->arg.open_seqid);
5605out_release_lock_seqid:
5606 nfs_release_seqid(data->arg.lock_seqid);
5607out_wait:
5608 nfs4_sequence_done(task, &data->res.seq_res);
5609 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5610}
5611
5612static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5613{
5614 struct nfs4_lockdata *data = calldata;
5615
5616 dprintk("%s: begin!\n", __func__);
5617
5618 if (!nfs4_sequence_done(task, &data->res.seq_res))
5619 return;
5620
5621 data->rpc_status = task->tk_status;
5622 if (data->arg.new_lock_owner != 0) {
5623 if (data->rpc_status == 0)
5624 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5625 else
5626 goto out;
5627 }
5628 if (data->rpc_status == 0) {
5629 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5630 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5631 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5632 }
5633out:
5634 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5635}
5636
5637static void nfs4_lock_release(void *calldata)
5638{
5639 struct nfs4_lockdata *data = calldata;
5640
5641 dprintk("%s: begin!\n", __func__);
5642 nfs_free_seqid(data->arg.open_seqid);
5643 if (data->cancelled != 0) {
5644 struct rpc_task *task;
5645 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5646 data->arg.lock_seqid);
5647 if (!IS_ERR(task))
5648 rpc_put_task_async(task);
5649 dprintk("%s: cancelling lock!\n", __func__);
5650 } else
5651 nfs_free_seqid(data->arg.lock_seqid);
5652 nfs4_put_lock_state(data->lsp);
5653 put_nfs_open_context(data->ctx);
5654 kfree(data);
5655 dprintk("%s: done!\n", __func__);
5656}
5657
5658static const struct rpc_call_ops nfs4_lock_ops = {
5659 .rpc_call_prepare = nfs4_lock_prepare,
5660 .rpc_call_done = nfs4_lock_done,
5661 .rpc_release = nfs4_lock_release,
5662};
5663
5664static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5665{
5666 switch (error) {
5667 case -NFS4ERR_ADMIN_REVOKED:
5668 case -NFS4ERR_BAD_STATEID:
5669 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5670 if (new_lock_owner != 0 ||
5671 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5672 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5673 break;
5674 case -NFS4ERR_STALE_STATEID:
5675 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5676 case -NFS4ERR_EXPIRED:
5677 nfs4_schedule_lease_recovery(server->nfs_client);
5678 };
5679}
5680
5681static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5682{
5683 struct nfs4_lockdata *data;
5684 struct rpc_task *task;
5685 struct rpc_message msg = {
5686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5687 .rpc_cred = state->owner->so_cred,
5688 };
5689 struct rpc_task_setup task_setup_data = {
5690 .rpc_client = NFS_CLIENT(state->inode),
5691 .rpc_message = &msg,
5692 .callback_ops = &nfs4_lock_ops,
5693 .workqueue = nfsiod_workqueue,
5694 .flags = RPC_TASK_ASYNC,
5695 };
5696 int ret;
5697
5698 dprintk("%s: begin!\n", __func__);
5699 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5700 fl->fl_u.nfs4_fl.owner,
5701 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5702 if (data == NULL)
5703 return -ENOMEM;
5704 if (IS_SETLKW(cmd))
5705 data->arg.block = 1;
5706 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5707 msg.rpc_argp = &data->arg;
5708 msg.rpc_resp = &data->res;
5709 task_setup_data.callback_data = data;
5710 if (recovery_type > NFS_LOCK_NEW) {
5711 if (recovery_type == NFS_LOCK_RECLAIM)
5712 data->arg.reclaim = NFS_LOCK_RECLAIM;
5713 nfs4_set_sequence_privileged(&data->arg.seq_args);
5714 }
5715 task = rpc_run_task(&task_setup_data);
5716 if (IS_ERR(task))
5717 return PTR_ERR(task);
5718 ret = nfs4_wait_for_completion_rpc_task(task);
5719 if (ret == 0) {
5720 ret = data->rpc_status;
5721 if (ret)
5722 nfs4_handle_setlk_error(data->server, data->lsp,
5723 data->arg.new_lock_owner, ret);
5724 } else
5725 data->cancelled = 1;
5726 rpc_put_task(task);
5727 dprintk("%s: done, ret = %d!\n", __func__, ret);
5728 return ret;
5729}
5730
5731static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5732{
5733 struct nfs_server *server = NFS_SERVER(state->inode);
5734 struct nfs4_exception exception = {
5735 .inode = state->inode,
5736 };
5737 int err;
5738
5739 do {
5740 /* Cache the lock if possible... */
5741 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5742 return 0;
5743 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5744 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5745 if (err != -NFS4ERR_DELAY)
5746 break;
5747 nfs4_handle_exception(server, err, &exception);
5748 } while (exception.retry);
5749 return err;
5750}
5751
5752static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5753{
5754 struct nfs_server *server = NFS_SERVER(state->inode);
5755 struct nfs4_exception exception = {
5756 .inode = state->inode,
5757 };
5758 int err;
5759
5760 err = nfs4_set_lock_state(state, request);
5761 if (err != 0)
5762 return err;
5763 if (!recover_lost_locks) {
5764 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5765 return 0;
5766 }
5767 do {
5768 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5769 return 0;
5770 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5771 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5772 switch (err) {
5773 default:
5774 goto out;
5775 case -NFS4ERR_GRACE:
5776 case -NFS4ERR_DELAY:
5777 nfs4_handle_exception(server, err, &exception);
5778 err = 0;
5779 }
5780 } while (exception.retry);
5781out:
5782 return err;
5783}
5784
5785#if defined(CONFIG_NFS_V4_1)
5786/**
5787 * nfs41_check_expired_locks - possibly free a lock stateid
5788 *
5789 * @state: NFSv4 state for an inode
5790 *
5791 * Returns NFS_OK if recovery for this stateid is now finished.
5792 * Otherwise a negative NFS4ERR value is returned.
5793 */
5794static int nfs41_check_expired_locks(struct nfs4_state *state)
5795{
5796 int status, ret = -NFS4ERR_BAD_STATEID;
5797 struct nfs4_lock_state *lsp;
5798 struct nfs_server *server = NFS_SERVER(state->inode);
5799
5800 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5801 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5802 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5803
5804 status = nfs41_test_stateid(server,
5805 &lsp->ls_stateid,
5806 cred);
5807 trace_nfs4_test_lock_stateid(state, lsp, status);
5808 if (status != NFS_OK) {
5809 /* Free the stateid unless the server
5810 * informs us the stateid is unrecognized. */
5811 if (status != -NFS4ERR_BAD_STATEID)
5812 nfs41_free_stateid(server,
5813 &lsp->ls_stateid,
5814 cred);
5815 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5816 ret = status;
5817 }
5818 }
5819 };
5820
5821 return ret;
5822}
5823
5824static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5825{
5826 int status = NFS_OK;
5827
5828 if (test_bit(LK_STATE_IN_USE, &state->flags))
5829 status = nfs41_check_expired_locks(state);
5830 if (status != NFS_OK)
5831 status = nfs4_lock_expired(state, request);
5832 return status;
5833}
5834#endif
5835
5836static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5837{
5838 struct nfs4_state_owner *sp = state->owner;
5839 struct nfs_inode *nfsi = NFS_I(state->inode);
5840 unsigned char fl_flags = request->fl_flags;
5841 unsigned int seq;
5842 int status = -ENOLCK;
5843
5844 if ((fl_flags & FL_POSIX) &&
5845 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5846 goto out;
5847 /* Is this a delegated open? */
5848 status = nfs4_set_lock_state(state, request);
5849 if (status != 0)
5850 goto out;
5851 request->fl_flags |= FL_ACCESS;
5852 status = do_vfs_lock(request->fl_file, request);
5853 if (status < 0)
5854 goto out;
5855 down_read(&nfsi->rwsem);
5856 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5857 /* Yes: cache locks! */
5858 /* ...but avoid races with delegation recall... */
5859 request->fl_flags = fl_flags & ~FL_SLEEP;
5860 status = do_vfs_lock(request->fl_file, request);
5861 goto out_unlock;
5862 }
5863 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5864 up_read(&nfsi->rwsem);
5865 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5866 if (status != 0)
5867 goto out;
5868 down_read(&nfsi->rwsem);
5869 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5870 status = -NFS4ERR_DELAY;
5871 goto out_unlock;
5872 }
5873 /* Note: we always want to sleep here! */
5874 request->fl_flags = fl_flags | FL_SLEEP;
5875 if (do_vfs_lock(request->fl_file, request) < 0)
5876 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5877 "manager!\n", __func__);
5878out_unlock:
5879 up_read(&nfsi->rwsem);
5880out:
5881 request->fl_flags = fl_flags;
5882 return status;
5883}
5884
5885static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5886{
5887 struct nfs4_exception exception = {
5888 .state = state,
5889 .inode = state->inode,
5890 };
5891 int err;
5892
5893 do {
5894 err = _nfs4_proc_setlk(state, cmd, request);
5895 trace_nfs4_set_lock(request, state, cmd, err);
5896 if (err == -NFS4ERR_DENIED)
5897 err = -EAGAIN;
5898 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5899 err, &exception);
5900 } while (exception.retry);
5901 return err;
5902}
5903
5904static int
5905nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5906{
5907 struct nfs_open_context *ctx;
5908 struct nfs4_state *state;
5909 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5910 int status;
5911
5912 /* verify open state */
5913 ctx = nfs_file_open_context(filp);
5914 state = ctx->state;
5915
5916 if (request->fl_start < 0 || request->fl_end < 0)
5917 return -EINVAL;
5918
5919 if (IS_GETLK(cmd)) {
5920 if (state != NULL)
5921 return nfs4_proc_getlk(state, F_GETLK, request);
5922 return 0;
5923 }
5924
5925 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5926 return -EINVAL;
5927
5928 if (request->fl_type == F_UNLCK) {
5929 if (state != NULL)
5930 return nfs4_proc_unlck(state, cmd, request);
5931 return 0;
5932 }
5933
5934 if (state == NULL)
5935 return -ENOLCK;
5936 /*
5937 * Don't rely on the VFS having checked the file open mode,
5938 * since it won't do this for flock() locks.
5939 */
5940 switch (request->fl_type) {
5941 case F_RDLCK:
5942 if (!(filp->f_mode & FMODE_READ))
5943 return -EBADF;
5944 break;
5945 case F_WRLCK:
5946 if (!(filp->f_mode & FMODE_WRITE))
5947 return -EBADF;
5948 }
5949
5950 do {
5951 status = nfs4_proc_setlk(state, cmd, request);
5952 if ((status != -EAGAIN) || IS_SETLK(cmd))
5953 break;
5954 timeout = nfs4_set_lock_task_retry(timeout);
5955 status = -ERESTARTSYS;
5956 if (signalled())
5957 break;
5958 } while(status < 0);
5959 return status;
5960}
5961
5962int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5963{
5964 struct nfs_server *server = NFS_SERVER(state->inode);
5965 int err;
5966
5967 err = nfs4_set_lock_state(state, fl);
5968 if (err != 0)
5969 return err;
5970 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5971 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5972}
5973
5974struct nfs_release_lockowner_data {
5975 struct nfs4_lock_state *lsp;
5976 struct nfs_server *server;
5977 struct nfs_release_lockowner_args args;
5978 struct nfs_release_lockowner_res res;
5979 unsigned long timestamp;
5980};
5981
5982static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5983{
5984 struct nfs_release_lockowner_data *data = calldata;
5985 struct nfs_server *server = data->server;
5986 nfs40_setup_sequence(server, &data->args.seq_args,
5987 &data->res.seq_res, task);
5988 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5989 data->timestamp = jiffies;
5990}
5991
5992static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5993{
5994 struct nfs_release_lockowner_data *data = calldata;
5995 struct nfs_server *server = data->server;
5996
5997 nfs40_sequence_done(task, &data->res.seq_res);
5998
5999 switch (task->tk_status) {
6000 case 0:
6001 renew_lease(server, data->timestamp);
6002 break;
6003 case -NFS4ERR_STALE_CLIENTID:
6004 case -NFS4ERR_EXPIRED:
6005 nfs4_schedule_lease_recovery(server->nfs_client);
6006 break;
6007 case -NFS4ERR_LEASE_MOVED:
6008 case -NFS4ERR_DELAY:
6009 if (nfs4_async_handle_error(task, server,
6010 NULL, NULL) == -EAGAIN)
6011 rpc_restart_call_prepare(task);
6012 }
6013}
6014
6015static void nfs4_release_lockowner_release(void *calldata)
6016{
6017 struct nfs_release_lockowner_data *data = calldata;
6018 nfs4_free_lock_state(data->server, data->lsp);
6019 kfree(calldata);
6020}
6021
6022static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6023 .rpc_call_prepare = nfs4_release_lockowner_prepare,
6024 .rpc_call_done = nfs4_release_lockowner_done,
6025 .rpc_release = nfs4_release_lockowner_release,
6026};
6027
6028static void
6029nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6030{
6031 struct nfs_release_lockowner_data *data;
6032 struct rpc_message msg = {
6033 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6034 };
6035
6036 if (server->nfs_client->cl_mvops->minor_version != 0)
6037 return;
6038
6039 data = kmalloc(sizeof(*data), GFP_NOFS);
6040 if (!data)
6041 return;
6042 data->lsp = lsp;
6043 data->server = server;
6044 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6045 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6046 data->args.lock_owner.s_dev = server->s_dev;
6047
6048 msg.rpc_argp = &data->args;
6049 msg.rpc_resp = &data->res;
6050 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6051 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6052}
6053
6054#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6055
6056static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6057 const void *buf, size_t buflen,
6058 int flags, int type)
6059{
6060 if (strcmp(key, "") != 0)
6061 return -EINVAL;
6062
6063 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6064}
6065
6066static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6067 void *buf, size_t buflen, int type)
6068{
6069 if (strcmp(key, "") != 0)
6070 return -EINVAL;
6071
6072 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6073}
6074
6075static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6076 size_t list_len, const char *name,
6077 size_t name_len, int type)
6078{
6079 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6080
6081 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6082 return 0;
6083
6084 if (list && len <= list_len)
6085 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6086 return len;
6087}
6088
6089#ifdef CONFIG_NFS_V4_SECURITY_LABEL
6090static inline int nfs4_server_supports_labels(struct nfs_server *server)
6091{
6092 return server->caps & NFS_CAP_SECURITY_LABEL;
6093}
6094
6095static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6096 const void *buf, size_t buflen,
6097 int flags, int type)
6098{
6099 if (security_ismaclabel(key))
6100 return nfs4_set_security_label(dentry, buf, buflen);
6101
6102 return -EOPNOTSUPP;
6103}
6104
6105static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6106 void *buf, size_t buflen, int type)
6107{
6108 if (security_ismaclabel(key))
6109 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6110 return -EOPNOTSUPP;
6111}
6112
6113static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6114 size_t list_len, const char *name,
6115 size_t name_len, int type)
6116{
6117 size_t len = 0;
6118
6119 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6120 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6121 if (list && len <= list_len)
6122 security_inode_listsecurity(dentry->d_inode, list, len);
6123 }
6124 return len;
6125}
6126
6127static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6128 .prefix = XATTR_SECURITY_PREFIX,
6129 .list = nfs4_xattr_list_nfs4_label,
6130 .get = nfs4_xattr_get_nfs4_label,
6131 .set = nfs4_xattr_set_nfs4_label,
6132};
6133#endif
6134
6135
6136/*
6137 * nfs_fhget will use either the mounted_on_fileid or the fileid
6138 */
6139static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6140{
6141 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6142 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6143 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6144 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6145 return;
6146
6147 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6148 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6149 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6150 fattr->nlink = 2;
6151}
6152
6153static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6154 const struct qstr *name,
6155 struct nfs4_fs_locations *fs_locations,
6156 struct page *page)
6157{
6158 struct nfs_server *server = NFS_SERVER(dir);
6159 u32 bitmask[3] = {
6160 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6161 };
6162 struct nfs4_fs_locations_arg args = {
6163 .dir_fh = NFS_FH(dir),
6164 .name = name,
6165 .page = page,
6166 .bitmask = bitmask,
6167 };
6168 struct nfs4_fs_locations_res res = {
6169 .fs_locations = fs_locations,
6170 };
6171 struct rpc_message msg = {
6172 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6173 .rpc_argp = &args,
6174 .rpc_resp = &res,
6175 };
6176 int status;
6177
6178 dprintk("%s: start\n", __func__);
6179
6180 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6181 * is not supported */
6182 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6183 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6184 else
6185 bitmask[0] |= FATTR4_WORD0_FILEID;
6186
6187 nfs_fattr_init(&fs_locations->fattr);
6188 fs_locations->server = server;
6189 fs_locations->nlocations = 0;
6190 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6191 dprintk("%s: returned status = %d\n", __func__, status);
6192 return status;
6193}
6194
6195int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6196 const struct qstr *name,
6197 struct nfs4_fs_locations *fs_locations,
6198 struct page *page)
6199{
6200 struct nfs4_exception exception = { };
6201 int err;
6202 do {
6203 err = _nfs4_proc_fs_locations(client, dir, name,
6204 fs_locations, page);
6205 trace_nfs4_get_fs_locations(dir, name, err);
6206 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6207 &exception);
6208 } while (exception.retry);
6209 return err;
6210}
6211
6212/*
6213 * This operation also signals the server that this client is
6214 * performing migration recovery. The server can stop returning
6215 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6216 * appended to this compound to identify the client ID which is
6217 * performing recovery.
6218 */
6219static int _nfs40_proc_get_locations(struct inode *inode,
6220 struct nfs4_fs_locations *locations,
6221 struct page *page, struct rpc_cred *cred)
6222{
6223 struct nfs_server *server = NFS_SERVER(inode);
6224 struct rpc_clnt *clnt = server->client;
6225 u32 bitmask[2] = {
6226 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6227 };
6228 struct nfs4_fs_locations_arg args = {
6229 .clientid = server->nfs_client->cl_clientid,
6230 .fh = NFS_FH(inode),
6231 .page = page,
6232 .bitmask = bitmask,
6233 .migration = 1, /* skip LOOKUP */
6234 .renew = 1, /* append RENEW */
6235 };
6236 struct nfs4_fs_locations_res res = {
6237 .fs_locations = locations,
6238 .migration = 1,
6239 .renew = 1,
6240 };
6241 struct rpc_message msg = {
6242 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6243 .rpc_argp = &args,
6244 .rpc_resp = &res,
6245 .rpc_cred = cred,
6246 };
6247 unsigned long now = jiffies;
6248 int status;
6249
6250 nfs_fattr_init(&locations->fattr);
6251 locations->server = server;
6252 locations->nlocations = 0;
6253
6254 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6255 nfs4_set_sequence_privileged(&args.seq_args);
6256 status = nfs4_call_sync_sequence(clnt, server, &msg,
6257 &args.seq_args, &res.seq_res);
6258 if (status)
6259 return status;
6260
6261 renew_lease(server, now);
6262 return 0;
6263}
6264
6265#ifdef CONFIG_NFS_V4_1
6266
6267/*
6268 * This operation also signals the server that this client is
6269 * performing migration recovery. The server can stop asserting
6270 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6271 * performing this operation is identified in the SEQUENCE
6272 * operation in this compound.
6273 *
6274 * When the client supports GETATTR(fs_locations_info), it can
6275 * be plumbed in here.
6276 */
6277static int _nfs41_proc_get_locations(struct inode *inode,
6278 struct nfs4_fs_locations *locations,
6279 struct page *page, struct rpc_cred *cred)
6280{
6281 struct nfs_server *server = NFS_SERVER(inode);
6282 struct rpc_clnt *clnt = server->client;
6283 u32 bitmask[2] = {
6284 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6285 };
6286 struct nfs4_fs_locations_arg args = {
6287 .fh = NFS_FH(inode),
6288 .page = page,
6289 .bitmask = bitmask,
6290 .migration = 1, /* skip LOOKUP */
6291 };
6292 struct nfs4_fs_locations_res res = {
6293 .fs_locations = locations,
6294 .migration = 1,
6295 };
6296 struct rpc_message msg = {
6297 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6298 .rpc_argp = &args,
6299 .rpc_resp = &res,
6300 .rpc_cred = cred,
6301 };
6302 int status;
6303
6304 nfs_fattr_init(&locations->fattr);
6305 locations->server = server;
6306 locations->nlocations = 0;
6307
6308 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6309 nfs4_set_sequence_privileged(&args.seq_args);
6310 status = nfs4_call_sync_sequence(clnt, server, &msg,
6311 &args.seq_args, &res.seq_res);
6312 if (status == NFS4_OK &&
6313 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6314 status = -NFS4ERR_LEASE_MOVED;
6315 return status;
6316}
6317
6318#endif /* CONFIG_NFS_V4_1 */
6319
6320/**
6321 * nfs4_proc_get_locations - discover locations for a migrated FSID
6322 * @inode: inode on FSID that is migrating
6323 * @locations: result of query
6324 * @page: buffer
6325 * @cred: credential to use for this operation
6326 *
6327 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6328 * operation failed, or a negative errno if a local error occurred.
6329 *
6330 * On success, "locations" is filled in, but if the server has
6331 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6332 * asserted.
6333 *
6334 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6335 * from this client that require migration recovery.
6336 */
6337int nfs4_proc_get_locations(struct inode *inode,
6338 struct nfs4_fs_locations *locations,
6339 struct page *page, struct rpc_cred *cred)
6340{
6341 struct nfs_server *server = NFS_SERVER(inode);
6342 struct nfs_client *clp = server->nfs_client;
6343 const struct nfs4_mig_recovery_ops *ops =
6344 clp->cl_mvops->mig_recovery_ops;
6345 struct nfs4_exception exception = { };
6346 int status;
6347
6348 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6349 (unsigned long long)server->fsid.major,
6350 (unsigned long long)server->fsid.minor,
6351 clp->cl_hostname);
6352 nfs_display_fhandle(NFS_FH(inode), __func__);
6353
6354 do {
6355 status = ops->get_locations(inode, locations, page, cred);
6356 if (status != -NFS4ERR_DELAY)
6357 break;
6358 nfs4_handle_exception(server, status, &exception);
6359 } while (exception.retry);
6360 return status;
6361}
6362
6363/*
6364 * This operation also signals the server that this client is
6365 * performing "lease moved" recovery. The server can stop
6366 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6367 * is appended to this compound to identify the client ID which is
6368 * performing recovery.
6369 */
6370static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6371{
6372 struct nfs_server *server = NFS_SERVER(inode);
6373 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6374 struct rpc_clnt *clnt = server->client;
6375 struct nfs4_fsid_present_arg args = {
6376 .fh = NFS_FH(inode),
6377 .clientid = clp->cl_clientid,
6378 .renew = 1, /* append RENEW */
6379 };
6380 struct nfs4_fsid_present_res res = {
6381 .renew = 1,
6382 };
6383 struct rpc_message msg = {
6384 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6385 .rpc_argp = &args,
6386 .rpc_resp = &res,
6387 .rpc_cred = cred,
6388 };
6389 unsigned long now = jiffies;
6390 int status;
6391
6392 res.fh = nfs_alloc_fhandle();
6393 if (res.fh == NULL)
6394 return -ENOMEM;
6395
6396 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6397 nfs4_set_sequence_privileged(&args.seq_args);
6398 status = nfs4_call_sync_sequence(clnt, server, &msg,
6399 &args.seq_args, &res.seq_res);
6400 nfs_free_fhandle(res.fh);
6401 if (status)
6402 return status;
6403
6404 do_renew_lease(clp, now);
6405 return 0;
6406}
6407
6408#ifdef CONFIG_NFS_V4_1
6409
6410/*
6411 * This operation also signals the server that this client is
6412 * performing "lease moved" recovery. The server can stop asserting
6413 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6414 * this operation is identified in the SEQUENCE operation in this
6415 * compound.
6416 */
6417static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6418{
6419 struct nfs_server *server = NFS_SERVER(inode);
6420 struct rpc_clnt *clnt = server->client;
6421 struct nfs4_fsid_present_arg args = {
6422 .fh = NFS_FH(inode),
6423 };
6424 struct nfs4_fsid_present_res res = {
6425 };
6426 struct rpc_message msg = {
6427 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6428 .rpc_argp = &args,
6429 .rpc_resp = &res,
6430 .rpc_cred = cred,
6431 };
6432 int status;
6433
6434 res.fh = nfs_alloc_fhandle();
6435 if (res.fh == NULL)
6436 return -ENOMEM;
6437
6438 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6439 nfs4_set_sequence_privileged(&args.seq_args);
6440 status = nfs4_call_sync_sequence(clnt, server, &msg,
6441 &args.seq_args, &res.seq_res);
6442 nfs_free_fhandle(res.fh);
6443 if (status == NFS4_OK &&
6444 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6445 status = -NFS4ERR_LEASE_MOVED;
6446 return status;
6447}
6448
6449#endif /* CONFIG_NFS_V4_1 */
6450
6451/**
6452 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6453 * @inode: inode on FSID to check
6454 * @cred: credential to use for this operation
6455 *
6456 * Server indicates whether the FSID is present, moved, or not
6457 * recognized. This operation is necessary to clear a LEASE_MOVED
6458 * condition for this client ID.
6459 *
6460 * Returns NFS4_OK if the FSID is present on this server,
6461 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6462 * NFS4ERR code if some error occurred on the server, or a
6463 * negative errno if a local failure occurred.
6464 */
6465int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6466{
6467 struct nfs_server *server = NFS_SERVER(inode);
6468 struct nfs_client *clp = server->nfs_client;
6469 const struct nfs4_mig_recovery_ops *ops =
6470 clp->cl_mvops->mig_recovery_ops;
6471 struct nfs4_exception exception = { };
6472 int status;
6473
6474 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6475 (unsigned long long)server->fsid.major,
6476 (unsigned long long)server->fsid.minor,
6477 clp->cl_hostname);
6478 nfs_display_fhandle(NFS_FH(inode), __func__);
6479
6480 do {
6481 status = ops->fsid_present(inode, cred);
6482 if (status != -NFS4ERR_DELAY)
6483 break;
6484 nfs4_handle_exception(server, status, &exception);
6485 } while (exception.retry);
6486 return status;
6487}
6488
6489/**
6490 * If 'use_integrity' is true and the state managment nfs_client
6491 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6492 * and the machine credential as per RFC3530bis and RFC5661 Security
6493 * Considerations sections. Otherwise, just use the user cred with the
6494 * filesystem's rpc_client.
6495 */
6496static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6497{
6498 int status;
6499 struct nfs4_secinfo_arg args = {
6500 .dir_fh = NFS_FH(dir),
6501 .name = name,
6502 };
6503 struct nfs4_secinfo_res res = {
6504 .flavors = flavors,
6505 };
6506 struct rpc_message msg = {
6507 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6508 .rpc_argp = &args,
6509 .rpc_resp = &res,
6510 };
6511 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6512 struct rpc_cred *cred = NULL;
6513
6514 if (use_integrity) {
6515 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6516 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6517 msg.rpc_cred = cred;
6518 }
6519
6520 dprintk("NFS call secinfo %s\n", name->name);
6521
6522 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6523 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6524
6525 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6526 &res.seq_res, 0);
6527 dprintk("NFS reply secinfo: %d\n", status);
6528
6529 if (cred)
6530 put_rpccred(cred);
6531
6532 return status;
6533}
6534
6535int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6536 struct nfs4_secinfo_flavors *flavors)
6537{
6538 struct nfs4_exception exception = { };
6539 int err;
6540 do {
6541 err = -NFS4ERR_WRONGSEC;
6542
6543 /* try to use integrity protection with machine cred */
6544 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6545 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6546
6547 /*
6548 * if unable to use integrity protection, or SECINFO with
6549 * integrity protection returns NFS4ERR_WRONGSEC (which is
6550 * disallowed by spec, but exists in deployed servers) use
6551 * the current filesystem's rpc_client and the user cred.
6552 */
6553 if (err == -NFS4ERR_WRONGSEC)
6554 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6555
6556 trace_nfs4_secinfo(dir, name, err);
6557 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6558 &exception);
6559 } while (exception.retry);
6560 return err;
6561}
6562
6563#ifdef CONFIG_NFS_V4_1
6564/*
6565 * Check the exchange flags returned by the server for invalid flags, having
6566 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6567 * DS flags set.
6568 */
6569static int nfs4_check_cl_exchange_flags(u32 flags)
6570{
6571 if (flags & ~EXCHGID4_FLAG_MASK_R)
6572 goto out_inval;
6573 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6574 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6575 goto out_inval;
6576 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6577 goto out_inval;
6578 return NFS_OK;
6579out_inval:
6580 return -NFS4ERR_INVAL;
6581}
6582
6583static bool
6584nfs41_same_server_scope(struct nfs41_server_scope *a,
6585 struct nfs41_server_scope *b)
6586{
6587 if (a->server_scope_sz == b->server_scope_sz &&
6588 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6589 return true;
6590
6591 return false;
6592}
6593
6594/*
6595 * nfs4_proc_bind_conn_to_session()
6596 *
6597 * The 4.1 client currently uses the same TCP connection for the
6598 * fore and backchannel.
6599 */
6600int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6601{
6602 int status;
6603 struct nfs41_bind_conn_to_session_res res;
6604 struct rpc_message msg = {
6605 .rpc_proc =
6606 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6607 .rpc_argp = clp,
6608 .rpc_resp = &res,
6609 .rpc_cred = cred,
6610 };
6611
6612 dprintk("--> %s\n", __func__);
6613
6614 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6615 if (unlikely(res.session == NULL)) {
6616 status = -ENOMEM;
6617 goto out;
6618 }
6619
6620 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6621 trace_nfs4_bind_conn_to_session(clp, status);
6622 if (status == 0) {
6623 if (memcmp(res.session->sess_id.data,
6624 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6625 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6626 status = -EIO;
6627 goto out_session;
6628 }
6629 if (res.dir != NFS4_CDFS4_BOTH) {
6630 dprintk("NFS: %s: Unexpected direction from server\n",
6631 __func__);
6632 status = -EIO;
6633 goto out_session;
6634 }
6635 if (res.use_conn_in_rdma_mode) {
6636 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6637 __func__);
6638 status = -EIO;
6639 goto out_session;
6640 }
6641 }
6642out_session:
6643 kfree(res.session);
6644out:
6645 dprintk("<-- %s status= %d\n", __func__, status);
6646 return status;
6647}
6648
6649/*
6650 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6651 * and operations we'd like to see to enable certain features in the allow map
6652 */
6653static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6654 .how = SP4_MACH_CRED,
6655 .enforce.u.words = {
6656 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6657 1 << (OP_EXCHANGE_ID - 32) |
6658 1 << (OP_CREATE_SESSION - 32) |
6659 1 << (OP_DESTROY_SESSION - 32) |
6660 1 << (OP_DESTROY_CLIENTID - 32)
6661 },
6662 .allow.u.words = {
6663 [0] = 1 << (OP_CLOSE) |
6664 1 << (OP_LOCKU) |
6665 1 << (OP_COMMIT),
6666 [1] = 1 << (OP_SECINFO - 32) |
6667 1 << (OP_SECINFO_NO_NAME - 32) |
6668 1 << (OP_TEST_STATEID - 32) |
6669 1 << (OP_FREE_STATEID - 32) |
6670 1 << (OP_WRITE - 32)
6671 }
6672};
6673
6674/*
6675 * Select the state protection mode for client `clp' given the server results
6676 * from exchange_id in `sp'.
6677 *
6678 * Returns 0 on success, negative errno otherwise.
6679 */
6680static int nfs4_sp4_select_mode(struct nfs_client *clp,
6681 struct nfs41_state_protection *sp)
6682{
6683 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6684 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6685 1 << (OP_EXCHANGE_ID - 32) |
6686 1 << (OP_CREATE_SESSION - 32) |
6687 1 << (OP_DESTROY_SESSION - 32) |
6688 1 << (OP_DESTROY_CLIENTID - 32)
6689 };
6690 unsigned int i;
6691
6692 if (sp->how == SP4_MACH_CRED) {
6693 /* Print state protect result */
6694 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6695 for (i = 0; i <= LAST_NFS4_OP; i++) {
6696 if (test_bit(i, sp->enforce.u.longs))
6697 dfprintk(MOUNT, " enforce op %d\n", i);
6698 if (test_bit(i, sp->allow.u.longs))
6699 dfprintk(MOUNT, " allow op %d\n", i);
6700 }
6701
6702 /* make sure nothing is on enforce list that isn't supported */
6703 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6704 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6705 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6706 return -EINVAL;
6707 }
6708 }
6709
6710 /*
6711 * Minimal mode - state operations are allowed to use machine
6712 * credential. Note this already happens by default, so the
6713 * client doesn't have to do anything more than the negotiation.
6714 *
6715 * NOTE: we don't care if EXCHANGE_ID is in the list -
6716 * we're already using the machine cred for exchange_id
6717 * and will never use a different cred.
6718 */
6719 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6720 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6721 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6722 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6723 dfprintk(MOUNT, "sp4_mach_cred:\n");
6724 dfprintk(MOUNT, " minimal mode enabled\n");
6725 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6726 } else {
6727 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6728 return -EINVAL;
6729 }
6730
6731 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6732 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6733 dfprintk(MOUNT, " cleanup mode enabled\n");
6734 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6735 }
6736
6737 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6738 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6739 dfprintk(MOUNT, " secinfo mode enabled\n");
6740 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6741 }
6742
6743 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6744 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6745 dfprintk(MOUNT, " stateid mode enabled\n");
6746 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6747 }
6748
6749 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6750 dfprintk(MOUNT, " write mode enabled\n");
6751 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6752 }
6753
6754 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6755 dfprintk(MOUNT, " commit mode enabled\n");
6756 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6757 }
6758 }
6759
6760 return 0;
6761}
6762
6763/*
6764 * _nfs4_proc_exchange_id()
6765 *
6766 * Wrapper for EXCHANGE_ID operation.
6767 */
6768static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6769 u32 sp4_how)
6770{
6771 nfs4_verifier verifier;
6772 struct nfs41_exchange_id_args args = {
6773 .verifier = &verifier,
6774 .client = clp,
6775#ifdef CONFIG_NFS_V4_1_MIGRATION
6776 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6777 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6778 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6779#else
6780 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6781 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6782#endif
6783 };
6784 struct nfs41_exchange_id_res res = {
6785 0
6786 };
6787 int status;
6788 struct rpc_message msg = {
6789 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6790 .rpc_argp = &args,
6791 .rpc_resp = &res,
6792 .rpc_cred = cred,
6793 };
6794
6795 nfs4_init_boot_verifier(clp, &verifier);
6796 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6797 sizeof(args.id));
6798 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6799 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6800 args.id_len, args.id);
6801
6802 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6803 GFP_NOFS);
6804 if (unlikely(res.server_owner == NULL)) {
6805 status = -ENOMEM;
6806 goto out;
6807 }
6808
6809 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6810 GFP_NOFS);
6811 if (unlikely(res.server_scope == NULL)) {
6812 status = -ENOMEM;
6813 goto out_server_owner;
6814 }
6815
6816 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6817 if (unlikely(res.impl_id == NULL)) {
6818 status = -ENOMEM;
6819 goto out_server_scope;
6820 }
6821
6822 switch (sp4_how) {
6823 case SP4_NONE:
6824 args.state_protect.how = SP4_NONE;
6825 break;
6826
6827 case SP4_MACH_CRED:
6828 args.state_protect = nfs4_sp4_mach_cred_request;
6829 break;
6830
6831 default:
6832 /* unsupported! */
6833 WARN_ON_ONCE(1);
6834 status = -EINVAL;
6835 goto out_server_scope;
6836 }
6837
6838 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6839 trace_nfs4_exchange_id(clp, status);
6840 if (status == 0)
6841 status = nfs4_check_cl_exchange_flags(res.flags);
6842
6843 if (status == 0)
6844 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6845
6846 if (status == 0) {
6847 clp->cl_clientid = res.clientid;
6848 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6849 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6850 clp->cl_seqid = res.seqid;
6851
6852 kfree(clp->cl_serverowner);
6853 clp->cl_serverowner = res.server_owner;
6854 res.server_owner = NULL;
6855
6856 /* use the most recent implementation id */
6857 kfree(clp->cl_implid);
6858 clp->cl_implid = res.impl_id;
6859
6860 if (clp->cl_serverscope != NULL &&
6861 !nfs41_same_server_scope(clp->cl_serverscope,
6862 res.server_scope)) {
6863 dprintk("%s: server_scope mismatch detected\n",
6864 __func__);
6865 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6866 kfree(clp->cl_serverscope);
6867 clp->cl_serverscope = NULL;
6868 }
6869
6870 if (clp->cl_serverscope == NULL) {
6871 clp->cl_serverscope = res.server_scope;
6872 goto out;
6873 }
6874 } else
6875 kfree(res.impl_id);
6876
6877out_server_owner:
6878 kfree(res.server_owner);
6879out_server_scope:
6880 kfree(res.server_scope);
6881out:
6882 if (clp->cl_implid != NULL)
6883 dprintk("NFS reply exchange_id: Server Implementation ID: "
6884 "domain: %s, name: %s, date: %llu,%u\n",
6885 clp->cl_implid->domain, clp->cl_implid->name,
6886 clp->cl_implid->date.seconds,
6887 clp->cl_implid->date.nseconds);
6888 dprintk("NFS reply exchange_id: %d\n", status);
6889 return status;
6890}
6891
6892/*
6893 * nfs4_proc_exchange_id()
6894 *
6895 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6896 *
6897 * Since the clientid has expired, all compounds using sessions
6898 * associated with the stale clientid will be returning
6899 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6900 * be in some phase of session reset.
6901 *
6902 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6903 */
6904int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6905{
6906 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6907 int status;
6908
6909 /* try SP4_MACH_CRED if krb5i/p */
6910 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6911 authflavor == RPC_AUTH_GSS_KRB5P) {
6912 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6913 if (!status)
6914 return 0;
6915 }
6916
6917 /* try SP4_NONE */
6918 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6919}
6920
6921static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6922 struct rpc_cred *cred)
6923{
6924 struct rpc_message msg = {
6925 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6926 .rpc_argp = clp,
6927 .rpc_cred = cred,
6928 };
6929 int status;
6930
6931 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6932 trace_nfs4_destroy_clientid(clp, status);
6933 if (status)
6934 dprintk("NFS: Got error %d from the server %s on "
6935 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6936 return status;
6937}
6938
6939static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6940 struct rpc_cred *cred)
6941{
6942 unsigned int loop;
6943 int ret;
6944
6945 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6946 ret = _nfs4_proc_destroy_clientid(clp, cred);
6947 switch (ret) {
6948 case -NFS4ERR_DELAY:
6949 case -NFS4ERR_CLIENTID_BUSY:
6950 ssleep(1);
6951 break;
6952 default:
6953 return ret;
6954 }
6955 }
6956 return 0;
6957}
6958
6959int nfs4_destroy_clientid(struct nfs_client *clp)
6960{
6961 struct rpc_cred *cred;
6962 int ret = 0;
6963
6964 if (clp->cl_mvops->minor_version < 1)
6965 goto out;
6966 if (clp->cl_exchange_flags == 0)
6967 goto out;
6968 if (clp->cl_preserve_clid)
6969 goto out;
6970 cred = nfs4_get_clid_cred(clp);
6971 ret = nfs4_proc_destroy_clientid(clp, cred);
6972 if (cred)
6973 put_rpccred(cred);
6974 switch (ret) {
6975 case 0:
6976 case -NFS4ERR_STALE_CLIENTID:
6977 clp->cl_exchange_flags = 0;
6978 }
6979out:
6980 return ret;
6981}
6982
6983struct nfs4_get_lease_time_data {
6984 struct nfs4_get_lease_time_args *args;
6985 struct nfs4_get_lease_time_res *res;
6986 struct nfs_client *clp;
6987};
6988
6989static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6990 void *calldata)
6991{
6992 struct nfs4_get_lease_time_data *data =
6993 (struct nfs4_get_lease_time_data *)calldata;
6994
6995 dprintk("--> %s\n", __func__);
6996 /* just setup sequence, do not trigger session recovery
6997 since we're invoked within one */
6998 nfs41_setup_sequence(data->clp->cl_session,
6999 &data->args->la_seq_args,
7000 &data->res->lr_seq_res,
7001 task);
7002 dprintk("<-- %s\n", __func__);
7003}
7004
7005/*
7006 * Called from nfs4_state_manager thread for session setup, so don't recover
7007 * from sequence operation or clientid errors.
7008 */
7009static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7010{
7011 struct nfs4_get_lease_time_data *data =
7012 (struct nfs4_get_lease_time_data *)calldata;
7013
7014 dprintk("--> %s\n", __func__);
7015 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7016 return;
7017 switch (task->tk_status) {
7018 case -NFS4ERR_DELAY:
7019 case -NFS4ERR_GRACE:
7020 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7021 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7022 task->tk_status = 0;
7023 /* fall through */
7024 case -NFS4ERR_RETRY_UNCACHED_REP:
7025 rpc_restart_call_prepare(task);
7026 return;
7027 }
7028 dprintk("<-- %s\n", __func__);
7029}
7030
7031static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7032 .rpc_call_prepare = nfs4_get_lease_time_prepare,
7033 .rpc_call_done = nfs4_get_lease_time_done,
7034};
7035
7036int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7037{
7038 struct rpc_task *task;
7039 struct nfs4_get_lease_time_args args;
7040 struct nfs4_get_lease_time_res res = {
7041 .lr_fsinfo = fsinfo,
7042 };
7043 struct nfs4_get_lease_time_data data = {
7044 .args = &args,
7045 .res = &res,
7046 .clp = clp,
7047 };
7048 struct rpc_message msg = {
7049 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7050 .rpc_argp = &args,
7051 .rpc_resp = &res,
7052 };
7053 struct rpc_task_setup task_setup = {
7054 .rpc_client = clp->cl_rpcclient,
7055 .rpc_message = &msg,
7056 .callback_ops = &nfs4_get_lease_time_ops,
7057 .callback_data = &data,
7058 .flags = RPC_TASK_TIMEOUT,
7059 };
7060 int status;
7061
7062 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7063 nfs4_set_sequence_privileged(&args.la_seq_args);
7064 dprintk("--> %s\n", __func__);
7065 task = rpc_run_task(&task_setup);
7066
7067 if (IS_ERR(task))
7068 status = PTR_ERR(task);
7069 else {
7070 status = task->tk_status;
7071 rpc_put_task(task);
7072 }
7073 dprintk("<-- %s return %d\n", __func__, status);
7074
7075 return status;
7076}
7077
7078/*
7079 * Initialize the values to be used by the client in CREATE_SESSION
7080 * If nfs4_init_session set the fore channel request and response sizes,
7081 * use them.
7082 *
7083 * Set the back channel max_resp_sz_cached to zero to force the client to
7084 * always set csa_cachethis to FALSE because the current implementation
7085 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7086 */
7087static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7088{
7089 unsigned int max_rqst_sz, max_resp_sz;
7090
7091 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7092 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7093
7094 /* Fore channel attributes */
7095 args->fc_attrs.max_rqst_sz = max_rqst_sz;
7096 args->fc_attrs.max_resp_sz = max_resp_sz;
7097 args->fc_attrs.max_ops = NFS4_MAX_OPS;
7098 args->fc_attrs.max_reqs = max_session_slots;
7099
7100 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7101 "max_ops=%u max_reqs=%u\n",
7102 __func__,
7103 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7104 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7105
7106 /* Back channel attributes */
7107 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7108 args->bc_attrs.max_resp_sz = PAGE_SIZE;
7109 args->bc_attrs.max_resp_sz_cached = 0;
7110 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7111 args->bc_attrs.max_reqs = 1;
7112
7113 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7114 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7115 __func__,
7116 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7117 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7118 args->bc_attrs.max_reqs);
7119}
7120
7121static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7122{
7123 struct nfs4_channel_attrs *sent = &args->fc_attrs;
7124 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7125
7126 if (rcvd->max_resp_sz > sent->max_resp_sz)
7127 return -EINVAL;
7128 /*
7129 * Our requested max_ops is the minimum we need; we're not
7130 * prepared to break up compounds into smaller pieces than that.
7131 * So, no point even trying to continue if the server won't
7132 * cooperate:
7133 */
7134 if (rcvd->max_ops < sent->max_ops)
7135 return -EINVAL;
7136 if (rcvd->max_reqs == 0)
7137 return -EINVAL;
7138 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7139 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7140 return 0;
7141}
7142
7143static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7144{
7145 struct nfs4_channel_attrs *sent = &args->bc_attrs;
7146 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7147
7148 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7149 return -EINVAL;
7150 if (rcvd->max_resp_sz < sent->max_resp_sz)
7151 return -EINVAL;
7152 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7153 return -EINVAL;
7154 /* These would render the backchannel useless: */
7155 if (rcvd->max_ops != sent->max_ops)
7156 return -EINVAL;
7157 if (rcvd->max_reqs != sent->max_reqs)
7158 return -EINVAL;
7159 return 0;
7160}
7161
7162static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7163 struct nfs4_session *session)
7164{
7165 int ret;
7166
7167 ret = nfs4_verify_fore_channel_attrs(args, session);
7168 if (ret)
7169 return ret;
7170 return nfs4_verify_back_channel_attrs(args, session);
7171}
7172
7173static int _nfs4_proc_create_session(struct nfs_client *clp,
7174 struct rpc_cred *cred)
7175{
7176 struct nfs4_session *session = clp->cl_session;
7177 struct nfs41_create_session_args args = {
7178 .client = clp,
7179 .cb_program = NFS4_CALLBACK,
7180 };
7181 struct nfs41_create_session_res res = {
7182 .client = clp,
7183 };
7184 struct rpc_message msg = {
7185 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7186 .rpc_argp = &args,
7187 .rpc_resp = &res,
7188 .rpc_cred = cred,
7189 };
7190 int status;
7191
7192 nfs4_init_channel_attrs(&args);
7193 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7194
7195 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7196 trace_nfs4_create_session(clp, status);
7197
7198 if (!status) {
7199 /* Verify the session's negotiated channel_attrs values */
7200 status = nfs4_verify_channel_attrs(&args, session);
7201 /* Increment the clientid slot sequence id */
7202 clp->cl_seqid++;
7203 }
7204
7205 return status;
7206}
7207
7208/*
7209 * Issues a CREATE_SESSION operation to the server.
7210 * It is the responsibility of the caller to verify the session is
7211 * expired before calling this routine.
7212 */
7213int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7214{
7215 int status;
7216 unsigned *ptr;
7217 struct nfs4_session *session = clp->cl_session;
7218
7219 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7220
7221 status = _nfs4_proc_create_session(clp, cred);
7222 if (status)
7223 goto out;
7224
7225 /* Init or reset the session slot tables */
7226 status = nfs4_setup_session_slot_tables(session);
7227 dprintk("slot table setup returned %d\n", status);
7228 if (status)
7229 goto out;
7230
7231 ptr = (unsigned *)&session->sess_id.data[0];
7232 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7233 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7234out:
7235 dprintk("<-- %s\n", __func__);
7236 return status;
7237}
7238
7239/*
7240 * Issue the over-the-wire RPC DESTROY_SESSION.
7241 * The caller must serialize access to this routine.
7242 */
7243int nfs4_proc_destroy_session(struct nfs4_session *session,
7244 struct rpc_cred *cred)
7245{
7246 struct rpc_message msg = {
7247 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7248 .rpc_argp = session,
7249 .rpc_cred = cred,
7250 };
7251 int status = 0;
7252
7253 dprintk("--> nfs4_proc_destroy_session\n");
7254
7255 /* session is still being setup */
7256 if (session->clp->cl_cons_state != NFS_CS_READY)
7257 return status;
7258
7259 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7260 trace_nfs4_destroy_session(session->clp, status);
7261
7262 if (status)
7263 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7264 "Session has been destroyed regardless...\n", status);
7265
7266 dprintk("<-- nfs4_proc_destroy_session\n");
7267 return status;
7268}
7269
7270/*
7271 * Renew the cl_session lease.
7272 */
7273struct nfs4_sequence_data {
7274 struct nfs_client *clp;
7275 struct nfs4_sequence_args args;
7276 struct nfs4_sequence_res res;
7277};
7278
7279static void nfs41_sequence_release(void *data)
7280{
7281 struct nfs4_sequence_data *calldata = data;
7282 struct nfs_client *clp = calldata->clp;
7283
7284 if (atomic_read(&clp->cl_count) > 1)
7285 nfs4_schedule_state_renewal(clp);
7286 nfs_put_client(clp);
7287 kfree(calldata);
7288}
7289
7290static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7291{
7292 switch(task->tk_status) {
7293 case -NFS4ERR_DELAY:
7294 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7295 return -EAGAIN;
7296 default:
7297 nfs4_schedule_lease_recovery(clp);
7298 }
7299 return 0;
7300}
7301
7302static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7303{
7304 struct nfs4_sequence_data *calldata = data;
7305 struct nfs_client *clp = calldata->clp;
7306
7307 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7308 return;
7309
7310 trace_nfs4_sequence(clp, task->tk_status);
7311 if (task->tk_status < 0) {
7312 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7313 if (atomic_read(&clp->cl_count) == 1)
7314 goto out;
7315
7316 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7317 rpc_restart_call_prepare(task);
7318 return;
7319 }
7320 }
7321 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7322out:
7323 dprintk("<-- %s\n", __func__);
7324}
7325
7326static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7327{
7328 struct nfs4_sequence_data *calldata = data;
7329 struct nfs_client *clp = calldata->clp;
7330 struct nfs4_sequence_args *args;
7331 struct nfs4_sequence_res *res;
7332
7333 args = task->tk_msg.rpc_argp;
7334 res = task->tk_msg.rpc_resp;
7335
7336 nfs41_setup_sequence(clp->cl_session, args, res, task);
7337}
7338
7339static const struct rpc_call_ops nfs41_sequence_ops = {
7340 .rpc_call_done = nfs41_sequence_call_done,
7341 .rpc_call_prepare = nfs41_sequence_prepare,
7342 .rpc_release = nfs41_sequence_release,
7343};
7344
7345static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7346 struct rpc_cred *cred,
7347 bool is_privileged)
7348{
7349 struct nfs4_sequence_data *calldata;
7350 struct rpc_message msg = {
7351 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7352 .rpc_cred = cred,
7353 };
7354 struct rpc_task_setup task_setup_data = {
7355 .rpc_client = clp->cl_rpcclient,
7356 .rpc_message = &msg,
7357 .callback_ops = &nfs41_sequence_ops,
7358 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7359 };
7360
7361 if (!atomic_inc_not_zero(&clp->cl_count))
7362 return ERR_PTR(-EIO);
7363 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7364 if (calldata == NULL) {
7365 nfs_put_client(clp);
7366 return ERR_PTR(-ENOMEM);
7367 }
7368 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7369 if (is_privileged)
7370 nfs4_set_sequence_privileged(&calldata->args);
7371 msg.rpc_argp = &calldata->args;
7372 msg.rpc_resp = &calldata->res;
7373 calldata->clp = clp;
7374 task_setup_data.callback_data = calldata;
7375
7376 return rpc_run_task(&task_setup_data);
7377}
7378
7379static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7380{
7381 struct rpc_task *task;
7382 int ret = 0;
7383
7384 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7385 return -EAGAIN;
7386 task = _nfs41_proc_sequence(clp, cred, false);
7387 if (IS_ERR(task))
7388 ret = PTR_ERR(task);
7389 else
7390 rpc_put_task_async(task);
7391 dprintk("<-- %s status=%d\n", __func__, ret);
7392 return ret;
7393}
7394
7395static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7396{
7397 struct rpc_task *task;
7398 int ret;
7399
7400 task = _nfs41_proc_sequence(clp, cred, true);
7401 if (IS_ERR(task)) {
7402 ret = PTR_ERR(task);
7403 goto out;
7404 }
7405 ret = rpc_wait_for_completion_task(task);
7406 if (!ret) {
7407 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7408
7409 if (task->tk_status == 0)
7410 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7411 ret = task->tk_status;
7412 }
7413 rpc_put_task(task);
7414out:
7415 dprintk("<-- %s status=%d\n", __func__, ret);
7416 return ret;
7417}
7418
7419struct nfs4_reclaim_complete_data {
7420 struct nfs_client *clp;
7421 struct nfs41_reclaim_complete_args arg;
7422 struct nfs41_reclaim_complete_res res;
7423};
7424
7425static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7426{
7427 struct nfs4_reclaim_complete_data *calldata = data;
7428
7429 nfs41_setup_sequence(calldata->clp->cl_session,
7430 &calldata->arg.seq_args,
7431 &calldata->res.seq_res,
7432 task);
7433}
7434
7435static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7436{
7437 switch(task->tk_status) {
7438 case 0:
7439 case -NFS4ERR_COMPLETE_ALREADY:
7440 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7441 break;
7442 case -NFS4ERR_DELAY:
7443 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7444 /* fall through */
7445 case -NFS4ERR_RETRY_UNCACHED_REP:
7446 return -EAGAIN;
7447 default:
7448 nfs4_schedule_lease_recovery(clp);
7449 }
7450 return 0;
7451}
7452
7453static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7454{
7455 struct nfs4_reclaim_complete_data *calldata = data;
7456 struct nfs_client *clp = calldata->clp;
7457 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7458
7459 dprintk("--> %s\n", __func__);
7460 if (!nfs41_sequence_done(task, res))
7461 return;
7462
7463 trace_nfs4_reclaim_complete(clp, task->tk_status);
7464 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7465 rpc_restart_call_prepare(task);
7466 return;
7467 }
7468 dprintk("<-- %s\n", __func__);
7469}
7470
7471static void nfs4_free_reclaim_complete_data(void *data)
7472{
7473 struct nfs4_reclaim_complete_data *calldata = data;
7474
7475 kfree(calldata);
7476}
7477
7478static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7479 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7480 .rpc_call_done = nfs4_reclaim_complete_done,
7481 .rpc_release = nfs4_free_reclaim_complete_data,
7482};
7483
7484/*
7485 * Issue a global reclaim complete.
7486 */
7487static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7488 struct rpc_cred *cred)
7489{
7490 struct nfs4_reclaim_complete_data *calldata;
7491 struct rpc_task *task;
7492 struct rpc_message msg = {
7493 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7494 .rpc_cred = cred,
7495 };
7496 struct rpc_task_setup task_setup_data = {
7497 .rpc_client = clp->cl_rpcclient,
7498 .rpc_message = &msg,
7499 .callback_ops = &nfs4_reclaim_complete_call_ops,
7500 .flags = RPC_TASK_ASYNC,
7501 };
7502 int status = -ENOMEM;
7503
7504 dprintk("--> %s\n", __func__);
7505 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7506 if (calldata == NULL)
7507 goto out;
7508 calldata->clp = clp;
7509 calldata->arg.one_fs = 0;
7510
7511 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7512 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7513 msg.rpc_argp = &calldata->arg;
7514 msg.rpc_resp = &calldata->res;
7515 task_setup_data.callback_data = calldata;
7516 task = rpc_run_task(&task_setup_data);
7517 if (IS_ERR(task)) {
7518 status = PTR_ERR(task);
7519 goto out;
7520 }
7521 status = nfs4_wait_for_completion_rpc_task(task);
7522 if (status == 0)
7523 status = task->tk_status;
7524 rpc_put_task(task);
7525 return 0;
7526out:
7527 dprintk("<-- %s status=%d\n", __func__, status);
7528 return status;
7529}
7530
7531static void
7532nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7533{
7534 struct nfs4_layoutget *lgp = calldata;
7535 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7536 struct nfs4_session *session = nfs4_get_session(server);
7537
7538 dprintk("--> %s\n", __func__);
7539 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7540 * right now covering the LAYOUTGET we are about to send.
7541 * However, that is not so catastrophic, and there seems
7542 * to be no way to prevent it completely.
7543 */
7544 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7545 &lgp->res.seq_res, task))
7546 return;
7547 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7548 NFS_I(lgp->args.inode)->layout,
7549 lgp->args.ctx->state)) {
7550 rpc_exit(task, NFS4_OK);
7551 }
7552}
7553
7554static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7555{
7556 struct nfs4_layoutget *lgp = calldata;
7557 struct inode *inode = lgp->args.inode;
7558 struct nfs_server *server = NFS_SERVER(inode);
7559 struct pnfs_layout_hdr *lo;
7560 struct nfs4_state *state = NULL;
7561 unsigned long timeo, now, giveup;
7562
7563 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7564
7565 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7566 goto out;
7567
7568 switch (task->tk_status) {
7569 case 0:
7570 goto out;
7571 /*
7572 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7573 * (or clients) writing to the same RAID stripe
7574 */
7575 case -NFS4ERR_LAYOUTTRYLATER:
7576 /*
7577 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7578 * existing layout before getting a new one).
7579 */
7580 case -NFS4ERR_RECALLCONFLICT:
7581 timeo = rpc_get_timeout(task->tk_client);
7582 giveup = lgp->args.timestamp + timeo;
7583 now = jiffies;
7584 if (time_after(giveup, now)) {
7585 unsigned long delay;
7586
7587 /* Delay for:
7588 * - Not less then NFS4_POLL_RETRY_MIN.
7589 * - One last time a jiffie before we give up
7590 * - exponential backoff (time_now minus start_attempt)
7591 */
7592 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7593 min((giveup - now - 1),
7594 now - lgp->args.timestamp));
7595
7596 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7597 __func__, delay);
7598 rpc_delay(task, delay);
7599 task->tk_status = 0;
7600 rpc_restart_call_prepare(task);
7601 goto out; /* Do not call nfs4_async_handle_error() */
7602 }
7603 break;
7604 case -NFS4ERR_EXPIRED:
7605 case -NFS4ERR_BAD_STATEID:
7606 spin_lock(&inode->i_lock);
7607 lo = NFS_I(inode)->layout;
7608 if (!lo || list_empty(&lo->plh_segs)) {
7609 spin_unlock(&inode->i_lock);
7610 /* If the open stateid was bad, then recover it. */
7611 state = lgp->args.ctx->state;
7612 } else {
7613 LIST_HEAD(head);
7614
7615 /*
7616 * Mark the bad layout state as invalid, then retry
7617 * with the current stateid.
7618 */
7619 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7620 spin_unlock(&inode->i_lock);
7621 pnfs_free_lseg_list(&head);
7622
7623 task->tk_status = 0;
7624 rpc_restart_call_prepare(task);
7625 }
7626 }
7627 if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7628 rpc_restart_call_prepare(task);
7629out:
7630 dprintk("<-- %s\n", __func__);
7631}
7632
7633static size_t max_response_pages(struct nfs_server *server)
7634{
7635 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7636 return nfs_page_array_len(0, max_resp_sz);
7637}
7638
7639static void nfs4_free_pages(struct page **pages, size_t size)
7640{
7641 int i;
7642
7643 if (!pages)
7644 return;
7645
7646 for (i = 0; i < size; i++) {
7647 if (!pages[i])
7648 break;
7649 __free_page(pages[i]);
7650 }
7651 kfree(pages);
7652}
7653
7654static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7655{
7656 struct page **pages;
7657 int i;
7658
7659 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7660 if (!pages) {
7661 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7662 return NULL;
7663 }
7664
7665 for (i = 0; i < size; i++) {
7666 pages[i] = alloc_page(gfp_flags);
7667 if (!pages[i]) {
7668 dprintk("%s: failed to allocate page\n", __func__);
7669 nfs4_free_pages(pages, size);
7670 return NULL;
7671 }
7672 }
7673
7674 return pages;
7675}
7676
7677static void nfs4_layoutget_release(void *calldata)
7678{
7679 struct nfs4_layoutget *lgp = calldata;
7680 struct inode *inode = lgp->args.inode;
7681 struct nfs_server *server = NFS_SERVER(inode);
7682 size_t max_pages = max_response_pages(server);
7683
7684 dprintk("--> %s\n", __func__);
7685 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7686 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7687 put_nfs_open_context(lgp->args.ctx);
7688 kfree(calldata);
7689 dprintk("<-- %s\n", __func__);
7690}
7691
7692static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7693 .rpc_call_prepare = nfs4_layoutget_prepare,
7694 .rpc_call_done = nfs4_layoutget_done,
7695 .rpc_release = nfs4_layoutget_release,
7696};
7697
7698struct pnfs_layout_segment *
7699nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7700{
7701 struct inode *inode = lgp->args.inode;
7702 struct nfs_server *server = NFS_SERVER(inode);
7703 size_t max_pages = max_response_pages(server);
7704 struct rpc_task *task;
7705 struct rpc_message msg = {
7706 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7707 .rpc_argp = &lgp->args,
7708 .rpc_resp = &lgp->res,
7709 .rpc_cred = lgp->cred,
7710 };
7711 struct rpc_task_setup task_setup_data = {
7712 .rpc_client = server->client,
7713 .rpc_message = &msg,
7714 .callback_ops = &nfs4_layoutget_call_ops,
7715 .callback_data = lgp,
7716 .flags = RPC_TASK_ASYNC,
7717 };
7718 struct pnfs_layout_segment *lseg = NULL;
7719 int status = 0;
7720
7721 dprintk("--> %s\n", __func__);
7722
7723 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7724 if (!lgp->args.layout.pages) {
7725 nfs4_layoutget_release(lgp);
7726 return ERR_PTR(-ENOMEM);
7727 }
7728 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7729 lgp->args.timestamp = jiffies;
7730
7731 lgp->res.layoutp = &lgp->args.layout;
7732 lgp->res.seq_res.sr_slot = NULL;
7733 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7734
7735 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7736 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7737
7738 task = rpc_run_task(&task_setup_data);
7739 if (IS_ERR(task))
7740 return ERR_CAST(task);
7741 status = nfs4_wait_for_completion_rpc_task(task);
7742 if (status == 0)
7743 status = task->tk_status;
7744 trace_nfs4_layoutget(lgp->args.ctx,
7745 &lgp->args.range,
7746 &lgp->res.range,
7747 status);
7748 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7749 if (status == 0 && lgp->res.layoutp->len)
7750 lseg = pnfs_layout_process(lgp);
7751 rpc_put_task(task);
7752 dprintk("<-- %s status=%d\n", __func__, status);
7753 if (status)
7754 return ERR_PTR(status);
7755 return lseg;
7756}
7757
7758static void
7759nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7760{
7761 struct nfs4_layoutreturn *lrp = calldata;
7762
7763 dprintk("--> %s\n", __func__);
7764 nfs41_setup_sequence(lrp->clp->cl_session,
7765 &lrp->args.seq_args,
7766 &lrp->res.seq_res,
7767 task);
7768}
7769
7770static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7771{
7772 struct nfs4_layoutreturn *lrp = calldata;
7773 struct nfs_server *server;
7774
7775 dprintk("--> %s\n", __func__);
7776
7777 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7778 return;
7779
7780 server = NFS_SERVER(lrp->args.inode);
7781 switch (task->tk_status) {
7782 default:
7783 task->tk_status = 0;
7784 case 0:
7785 break;
7786 case -NFS4ERR_DELAY:
7787 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7788 break;
7789 rpc_restart_call_prepare(task);
7790 return;
7791 }
7792 dprintk("<-- %s\n", __func__);
7793}
7794
7795static void nfs4_layoutreturn_release(void *calldata)
7796{
7797 struct nfs4_layoutreturn *lrp = calldata;
7798 struct pnfs_layout_hdr *lo = lrp->args.layout;
7799
7800 dprintk("--> %s\n", __func__);
7801 spin_lock(&lo->plh_inode->i_lock);
7802 if (lrp->res.lrs_present)
7803 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7804 lo->plh_block_lgets--;
7805 spin_unlock(&lo->plh_inode->i_lock);
7806 pnfs_put_layout_hdr(lrp->args.layout);
7807 kfree(calldata);
7808 dprintk("<-- %s\n", __func__);
7809}
7810
7811static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7812 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7813 .rpc_call_done = nfs4_layoutreturn_done,
7814 .rpc_release = nfs4_layoutreturn_release,
7815};
7816
7817int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7818{
7819 struct rpc_task *task;
7820 struct rpc_message msg = {
7821 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7822 .rpc_argp = &lrp->args,
7823 .rpc_resp = &lrp->res,
7824 .rpc_cred = lrp->cred,
7825 };
7826 struct rpc_task_setup task_setup_data = {
7827 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7828 .rpc_message = &msg,
7829 .callback_ops = &nfs4_layoutreturn_call_ops,
7830 .callback_data = lrp,
7831 };
7832 int status;
7833
7834 dprintk("--> %s\n", __func__);
7835 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7836 task = rpc_run_task(&task_setup_data);
7837 if (IS_ERR(task))
7838 return PTR_ERR(task);
7839 status = task->tk_status;
7840 trace_nfs4_layoutreturn(lrp->args.inode, status);
7841 dprintk("<-- %s status=%d\n", __func__, status);
7842 rpc_put_task(task);
7843 return status;
7844}
7845
7846static int
7847_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7848 struct pnfs_device *pdev,
7849 struct rpc_cred *cred)
7850{
7851 struct nfs4_getdeviceinfo_args args = {
7852 .pdev = pdev,
7853 };
7854 struct nfs4_getdeviceinfo_res res = {
7855 .pdev = pdev,
7856 };
7857 struct rpc_message msg = {
7858 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7859 .rpc_argp = &args,
7860 .rpc_resp = &res,
7861 .rpc_cred = cred,
7862 };
7863 int status;
7864
7865 dprintk("--> %s\n", __func__);
7866 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7867 dprintk("<-- %s status=%d\n", __func__, status);
7868
7869 return status;
7870}
7871
7872int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7873 struct pnfs_device *pdev,
7874 struct rpc_cred *cred)
7875{
7876 struct nfs4_exception exception = { };
7877 int err;
7878
7879 do {
7880 err = nfs4_handle_exception(server,
7881 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7882 &exception);
7883 } while (exception.retry);
7884 return err;
7885}
7886EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7887
7888static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7889{
7890 struct nfs4_layoutcommit_data *data = calldata;
7891 struct nfs_server *server = NFS_SERVER(data->args.inode);
7892 struct nfs4_session *session = nfs4_get_session(server);
7893
7894 nfs41_setup_sequence(session,
7895 &data->args.seq_args,
7896 &data->res.seq_res,
7897 task);
7898}
7899
7900static void
7901nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7902{
7903 struct nfs4_layoutcommit_data *data = calldata;
7904 struct nfs_server *server = NFS_SERVER(data->args.inode);
7905
7906 if (!nfs41_sequence_done(task, &data->res.seq_res))
7907 return;
7908
7909 switch (task->tk_status) { /* Just ignore these failures */
7910 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7911 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7912 case -NFS4ERR_BADLAYOUT: /* no layout */
7913 case -NFS4ERR_GRACE: /* loca_recalim always false */
7914 task->tk_status = 0;
7915 case 0:
7916 break;
7917 default:
7918 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7919 rpc_restart_call_prepare(task);
7920 return;
7921 }
7922 }
7923}
7924
7925static void nfs4_layoutcommit_release(void *calldata)
7926{
7927 struct nfs4_layoutcommit_data *data = calldata;
7928
7929 pnfs_cleanup_layoutcommit(data);
7930 nfs_post_op_update_inode_force_wcc(data->args.inode,
7931 data->res.fattr);
7932 put_rpccred(data->cred);
7933 kfree(data);
7934}
7935
7936static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7937 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7938 .rpc_call_done = nfs4_layoutcommit_done,
7939 .rpc_release = nfs4_layoutcommit_release,
7940};
7941
7942int
7943nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7944{
7945 struct rpc_message msg = {
7946 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7947 .rpc_argp = &data->args,
7948 .rpc_resp = &data->res,
7949 .rpc_cred = data->cred,
7950 };
7951 struct rpc_task_setup task_setup_data = {
7952 .task = &data->task,
7953 .rpc_client = NFS_CLIENT(data->args.inode),
7954 .rpc_message = &msg,
7955 .callback_ops = &nfs4_layoutcommit_ops,
7956 .callback_data = data,
7957 .flags = RPC_TASK_ASYNC,
7958 };
7959 struct rpc_task *task;
7960 int status = 0;
7961
7962 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7963 "lbw: %llu inode %lu\n",
7964 data->task.tk_pid, sync,
7965 data->args.lastbytewritten,
7966 data->args.inode->i_ino);
7967
7968 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7969 task = rpc_run_task(&task_setup_data);
7970 if (IS_ERR(task))
7971 return PTR_ERR(task);
7972 if (sync == false)
7973 goto out;
7974 status = nfs4_wait_for_completion_rpc_task(task);
7975 if (status != 0)
7976 goto out;
7977 status = task->tk_status;
7978 trace_nfs4_layoutcommit(data->args.inode, status);
7979out:
7980 dprintk("%s: status %d\n", __func__, status);
7981 rpc_put_task(task);
7982 return status;
7983}
7984
7985/**
7986 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7987 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7988 */
7989static int
7990_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7991 struct nfs_fsinfo *info,
7992 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7993{
7994 struct nfs41_secinfo_no_name_args args = {
7995 .style = SECINFO_STYLE_CURRENT_FH,
7996 };
7997 struct nfs4_secinfo_res res = {
7998 .flavors = flavors,
7999 };
8000 struct rpc_message msg = {
8001 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8002 .rpc_argp = &args,
8003 .rpc_resp = &res,
8004 };
8005 struct rpc_clnt *clnt = server->client;
8006 struct rpc_cred *cred = NULL;
8007 int status;
8008
8009 if (use_integrity) {
8010 clnt = server->nfs_client->cl_rpcclient;
8011 cred = nfs4_get_clid_cred(server->nfs_client);
8012 msg.rpc_cred = cred;
8013 }
8014
8015 dprintk("--> %s\n", __func__);
8016 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8017 &res.seq_res, 0);
8018 dprintk("<-- %s status=%d\n", __func__, status);
8019
8020 if (cred)
8021 put_rpccred(cred);
8022
8023 return status;
8024}
8025
8026static int
8027nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8028 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8029{
8030 struct nfs4_exception exception = { };
8031 int err;
8032 do {
8033 /* first try using integrity protection */
8034 err = -NFS4ERR_WRONGSEC;
8035
8036 /* try to use integrity protection with machine cred */
8037 if (_nfs4_is_integrity_protected(server->nfs_client))
8038 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8039 flavors, true);
8040
8041 /*
8042 * if unable to use integrity protection, or SECINFO with
8043 * integrity protection returns NFS4ERR_WRONGSEC (which is
8044 * disallowed by spec, but exists in deployed servers) use
8045 * the current filesystem's rpc_client and the user cred.
8046 */
8047 if (err == -NFS4ERR_WRONGSEC)
8048 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8049 flavors, false);
8050
8051 switch (err) {
8052 case 0:
8053 case -NFS4ERR_WRONGSEC:
8054 case -ENOTSUPP:
8055 goto out;
8056 default:
8057 err = nfs4_handle_exception(server, err, &exception);
8058 }
8059 } while (exception.retry);
8060out:
8061 return err;
8062}
8063
8064static int
8065nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8066 struct nfs_fsinfo *info)
8067{
8068 int err;
8069 struct page *page;
8070 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8071 struct nfs4_secinfo_flavors *flavors;
8072 struct nfs4_secinfo4 *secinfo;
8073 int i;
8074
8075 page = alloc_page(GFP_KERNEL);
8076 if (!page) {
8077 err = -ENOMEM;
8078 goto out;
8079 }
8080
8081 flavors = page_address(page);
8082 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8083
8084 /*
8085 * Fall back on "guess and check" method if
8086 * the server doesn't support SECINFO_NO_NAME
8087 */
8088 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8089 err = nfs4_find_root_sec(server, fhandle, info);
8090 goto out_freepage;
8091 }
8092 if (err)
8093 goto out_freepage;
8094
8095 for (i = 0; i < flavors->num_flavors; i++) {
8096 secinfo = &flavors->flavors[i];
8097
8098 switch (secinfo->flavor) {
8099 case RPC_AUTH_NULL:
8100 case RPC_AUTH_UNIX:
8101 case RPC_AUTH_GSS:
8102 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8103 &secinfo->flavor_info);
8104 break;
8105 default:
8106 flavor = RPC_AUTH_MAXFLAVOR;
8107 break;
8108 }
8109
8110 if (!nfs_auth_info_match(&server->auth_info, flavor))
8111 flavor = RPC_AUTH_MAXFLAVOR;
8112
8113 if (flavor != RPC_AUTH_MAXFLAVOR) {
8114 err = nfs4_lookup_root_sec(server, fhandle,
8115 info, flavor);
8116 if (!err)
8117 break;
8118 }
8119 }
8120
8121 if (flavor == RPC_AUTH_MAXFLAVOR)
8122 err = -EPERM;
8123
8124out_freepage:
8125 put_page(page);
8126 if (err == -EACCES)
8127 return -EPERM;
8128out:
8129 return err;
8130}
8131
8132static int _nfs41_test_stateid(struct nfs_server *server,
8133 nfs4_stateid *stateid,
8134 struct rpc_cred *cred)
8135{
8136 int status;
8137 struct nfs41_test_stateid_args args = {
8138 .stateid = stateid,
8139 };
8140 struct nfs41_test_stateid_res res;
8141 struct rpc_message msg = {
8142 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8143 .rpc_argp = &args,
8144 .rpc_resp = &res,
8145 .rpc_cred = cred,
8146 };
8147 struct rpc_clnt *rpc_client = server->client;
8148
8149 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8150 &rpc_client, &msg);
8151
8152 dprintk("NFS call test_stateid %p\n", stateid);
8153 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8154 nfs4_set_sequence_privileged(&args.seq_args);
8155 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8156 &args.seq_args, &res.seq_res);
8157 if (status != NFS_OK) {
8158 dprintk("NFS reply test_stateid: failed, %d\n", status);
8159 return status;
8160 }
8161 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8162 return -res.status;
8163}
8164
8165/**
8166 * nfs41_test_stateid - perform a TEST_STATEID operation
8167 *
8168 * @server: server / transport on which to perform the operation
8169 * @stateid: state ID to test
8170 * @cred: credential
8171 *
8172 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8173 * Otherwise a negative NFS4ERR value is returned if the operation
8174 * failed or the state ID is not currently valid.
8175 */
8176static int nfs41_test_stateid(struct nfs_server *server,
8177 nfs4_stateid *stateid,
8178 struct rpc_cred *cred)
8179{
8180 struct nfs4_exception exception = { };
8181 int err;
8182 do {
8183 err = _nfs41_test_stateid(server, stateid, cred);
8184 if (err != -NFS4ERR_DELAY)
8185 break;
8186 nfs4_handle_exception(server, err, &exception);
8187 } while (exception.retry);
8188 return err;
8189}
8190
8191struct nfs_free_stateid_data {
8192 struct nfs_server *server;
8193 struct nfs41_free_stateid_args args;
8194 struct nfs41_free_stateid_res res;
8195};
8196
8197static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8198{
8199 struct nfs_free_stateid_data *data = calldata;
8200 nfs41_setup_sequence(nfs4_get_session(data->server),
8201 &data->args.seq_args,
8202 &data->res.seq_res,
8203 task);
8204}
8205
8206static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8207{
8208 struct nfs_free_stateid_data *data = calldata;
8209
8210 nfs41_sequence_done(task, &data->res.seq_res);
8211
8212 switch (task->tk_status) {
8213 case -NFS4ERR_DELAY:
8214 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8215 rpc_restart_call_prepare(task);
8216 }
8217}
8218
8219static void nfs41_free_stateid_release(void *calldata)
8220{
8221 kfree(calldata);
8222}
8223
8224static const struct rpc_call_ops nfs41_free_stateid_ops = {
8225 .rpc_call_prepare = nfs41_free_stateid_prepare,
8226 .rpc_call_done = nfs41_free_stateid_done,
8227 .rpc_release = nfs41_free_stateid_release,
8228};
8229
8230static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8231 nfs4_stateid *stateid,
8232 struct rpc_cred *cred,
8233 bool privileged)
8234{
8235 struct rpc_message msg = {
8236 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8237 .rpc_cred = cred,
8238 };
8239 struct rpc_task_setup task_setup = {
8240 .rpc_client = server->client,
8241 .rpc_message = &msg,
8242 .callback_ops = &nfs41_free_stateid_ops,
8243 .flags = RPC_TASK_ASYNC,
8244 };
8245 struct nfs_free_stateid_data *data;
8246
8247 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8248 &task_setup.rpc_client, &msg);
8249
8250 dprintk("NFS call free_stateid %p\n", stateid);
8251 data = kmalloc(sizeof(*data), GFP_NOFS);
8252 if (!data)
8253 return ERR_PTR(-ENOMEM);
8254 data->server = server;
8255 nfs4_stateid_copy(&data->args.stateid, stateid);
8256
8257 task_setup.callback_data = data;
8258
8259 msg.rpc_argp = &data->args;
8260 msg.rpc_resp = &data->res;
8261 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8262 if (privileged)
8263 nfs4_set_sequence_privileged(&data->args.seq_args);
8264
8265 return rpc_run_task(&task_setup);
8266}
8267
8268/**
8269 * nfs41_free_stateid - perform a FREE_STATEID operation
8270 *
8271 * @server: server / transport on which to perform the operation
8272 * @stateid: state ID to release
8273 * @cred: credential
8274 *
8275 * Returns NFS_OK if the server freed "stateid". Otherwise a
8276 * negative NFS4ERR value is returned.
8277 */
8278static int nfs41_free_stateid(struct nfs_server *server,
8279 nfs4_stateid *stateid,
8280 struct rpc_cred *cred)
8281{
8282 struct rpc_task *task;
8283 int ret;
8284
8285 task = _nfs41_free_stateid(server, stateid, cred, true);
8286 if (IS_ERR(task))
8287 return PTR_ERR(task);
8288 ret = rpc_wait_for_completion_task(task);
8289 if (!ret)
8290 ret = task->tk_status;
8291 rpc_put_task(task);
8292 return ret;
8293}
8294
8295static void
8296nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8297{
8298 struct rpc_task *task;
8299 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8300
8301 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8302 nfs4_free_lock_state(server, lsp);
8303 if (IS_ERR(task))
8304 return;
8305 rpc_put_task(task);
8306}
8307
8308static bool nfs41_match_stateid(const nfs4_stateid *s1,
8309 const nfs4_stateid *s2)
8310{
8311 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8312 return false;
8313
8314 if (s1->seqid == s2->seqid)
8315 return true;
8316 if (s1->seqid == 0 || s2->seqid == 0)
8317 return true;
8318
8319 return false;
8320}
8321
8322#endif /* CONFIG_NFS_V4_1 */
8323
8324static bool nfs4_match_stateid(const nfs4_stateid *s1,
8325 const nfs4_stateid *s2)
8326{
8327 return nfs4_stateid_match(s1, s2);
8328}
8329
8330
8331static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8332 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8333 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8334 .recover_open = nfs4_open_reclaim,
8335 .recover_lock = nfs4_lock_reclaim,
8336 .establish_clid = nfs4_init_clientid,
8337 .detect_trunking = nfs40_discover_server_trunking,
8338};
8339
8340#if defined(CONFIG_NFS_V4_1)
8341static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8342 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8343 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8344 .recover_open = nfs4_open_reclaim,
8345 .recover_lock = nfs4_lock_reclaim,
8346 .establish_clid = nfs41_init_clientid,
8347 .reclaim_complete = nfs41_proc_reclaim_complete,
8348 .detect_trunking = nfs41_discover_server_trunking,
8349};
8350#endif /* CONFIG_NFS_V4_1 */
8351
8352static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8353 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8354 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8355 .recover_open = nfs40_open_expired,
8356 .recover_lock = nfs4_lock_expired,
8357 .establish_clid = nfs4_init_clientid,
8358};
8359
8360#if defined(CONFIG_NFS_V4_1)
8361static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8362 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8363 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8364 .recover_open = nfs41_open_expired,
8365 .recover_lock = nfs41_lock_expired,
8366 .establish_clid = nfs41_init_clientid,
8367};
8368#endif /* CONFIG_NFS_V4_1 */
8369
8370static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8371 .sched_state_renewal = nfs4_proc_async_renew,
8372 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8373 .renew_lease = nfs4_proc_renew,
8374};
8375
8376#if defined(CONFIG_NFS_V4_1)
8377static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8378 .sched_state_renewal = nfs41_proc_async_sequence,
8379 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8380 .renew_lease = nfs4_proc_sequence,
8381};
8382#endif
8383
8384static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8385 .get_locations = _nfs40_proc_get_locations,
8386 .fsid_present = _nfs40_proc_fsid_present,
8387};
8388
8389#if defined(CONFIG_NFS_V4_1)
8390static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8391 .get_locations = _nfs41_proc_get_locations,
8392 .fsid_present = _nfs41_proc_fsid_present,
8393};
8394#endif /* CONFIG_NFS_V4_1 */
8395
8396static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8397 .minor_version = 0,
8398 .init_caps = NFS_CAP_READDIRPLUS
8399 | NFS_CAP_ATOMIC_OPEN
8400 | NFS_CAP_CHANGE_ATTR
8401 | NFS_CAP_POSIX_LOCK,
8402 .init_client = nfs40_init_client,
8403 .shutdown_client = nfs40_shutdown_client,
8404 .match_stateid = nfs4_match_stateid,
8405 .find_root_sec = nfs4_find_root_sec,
8406 .free_lock_state = nfs4_release_lockowner,
8407 .call_sync_ops = &nfs40_call_sync_ops,
8408 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8409 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8410 .state_renewal_ops = &nfs40_state_renewal_ops,
8411 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8412};
8413
8414#if defined(CONFIG_NFS_V4_1)
8415static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8416 .minor_version = 1,
8417 .init_caps = NFS_CAP_READDIRPLUS
8418 | NFS_CAP_ATOMIC_OPEN
8419 | NFS_CAP_CHANGE_ATTR
8420 | NFS_CAP_POSIX_LOCK
8421 | NFS_CAP_STATEID_NFSV41
8422 | NFS_CAP_ATOMIC_OPEN_V1,
8423 .init_client = nfs41_init_client,
8424 .shutdown_client = nfs41_shutdown_client,
8425 .match_stateid = nfs41_match_stateid,
8426 .find_root_sec = nfs41_find_root_sec,
8427 .free_lock_state = nfs41_free_lock_state,
8428 .call_sync_ops = &nfs41_call_sync_ops,
8429 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8430 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8431 .state_renewal_ops = &nfs41_state_renewal_ops,
8432 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8433};
8434#endif
8435
8436#if defined(CONFIG_NFS_V4_2)
8437static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8438 .minor_version = 2,
8439 .init_caps = NFS_CAP_READDIRPLUS
8440 | NFS_CAP_ATOMIC_OPEN
8441 | NFS_CAP_CHANGE_ATTR
8442 | NFS_CAP_POSIX_LOCK
8443 | NFS_CAP_STATEID_NFSV41
8444 | NFS_CAP_ATOMIC_OPEN_V1
8445 | NFS_CAP_SEEK,
8446 .init_client = nfs41_init_client,
8447 .shutdown_client = nfs41_shutdown_client,
8448 .match_stateid = nfs41_match_stateid,
8449 .find_root_sec = nfs41_find_root_sec,
8450 .free_lock_state = nfs41_free_lock_state,
8451 .call_sync_ops = &nfs41_call_sync_ops,
8452 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8453 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8454 .state_renewal_ops = &nfs41_state_renewal_ops,
8455};
8456#endif
8457
8458const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8459 [0] = &nfs_v4_0_minor_ops,
8460#if defined(CONFIG_NFS_V4_1)
8461 [1] = &nfs_v4_1_minor_ops,
8462#endif
8463#if defined(CONFIG_NFS_V4_2)
8464 [2] = &nfs_v4_2_minor_ops,
8465#endif
8466};
8467
8468static const struct inode_operations nfs4_dir_inode_operations = {
8469 .create = nfs_create,
8470 .lookup = nfs_lookup,
8471 .atomic_open = nfs_atomic_open,
8472 .link = nfs_link,
8473 .unlink = nfs_unlink,
8474 .symlink = nfs_symlink,
8475 .mkdir = nfs_mkdir,
8476 .rmdir = nfs_rmdir,
8477 .mknod = nfs_mknod,
8478 .rename = nfs_rename,
8479 .permission = nfs_permission,
8480 .getattr = nfs_getattr,
8481 .setattr = nfs_setattr,
8482 .getxattr = generic_getxattr,
8483 .setxattr = generic_setxattr,
8484 .listxattr = generic_listxattr,
8485 .removexattr = generic_removexattr,
8486};
8487
8488static const struct inode_operations nfs4_file_inode_operations = {
8489 .permission = nfs_permission,
8490 .getattr = nfs_getattr,
8491 .setattr = nfs_setattr,
8492 .getxattr = generic_getxattr,
8493 .setxattr = generic_setxattr,
8494 .listxattr = generic_listxattr,
8495 .removexattr = generic_removexattr,
8496};
8497
8498const struct nfs_rpc_ops nfs_v4_clientops = {
8499 .version = 4, /* protocol version */
8500 .dentry_ops = &nfs4_dentry_operations,
8501 .dir_inode_ops = &nfs4_dir_inode_operations,
8502 .file_inode_ops = &nfs4_file_inode_operations,
8503 .file_ops = &nfs4_file_operations,
8504 .getroot = nfs4_proc_get_root,
8505 .submount = nfs4_submount,
8506 .try_mount = nfs4_try_mount,
8507 .getattr = nfs4_proc_getattr,
8508 .setattr = nfs4_proc_setattr,
8509 .lookup = nfs4_proc_lookup,
8510 .access = nfs4_proc_access,
8511 .readlink = nfs4_proc_readlink,
8512 .create = nfs4_proc_create,
8513 .remove = nfs4_proc_remove,
8514 .unlink_setup = nfs4_proc_unlink_setup,
8515 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8516 .unlink_done = nfs4_proc_unlink_done,
8517 .rename_setup = nfs4_proc_rename_setup,
8518 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8519 .rename_done = nfs4_proc_rename_done,
8520 .link = nfs4_proc_link,
8521 .symlink = nfs4_proc_symlink,
8522 .mkdir = nfs4_proc_mkdir,
8523 .rmdir = nfs4_proc_remove,
8524 .readdir = nfs4_proc_readdir,
8525 .mknod = nfs4_proc_mknod,
8526 .statfs = nfs4_proc_statfs,
8527 .fsinfo = nfs4_proc_fsinfo,
8528 .pathconf = nfs4_proc_pathconf,
8529 .set_capabilities = nfs4_server_capabilities,
8530 .decode_dirent = nfs4_decode_dirent,
8531 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8532 .read_setup = nfs4_proc_read_setup,
8533 .read_done = nfs4_read_done,
8534 .write_setup = nfs4_proc_write_setup,
8535 .write_done = nfs4_write_done,
8536 .commit_setup = nfs4_proc_commit_setup,
8537 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8538 .commit_done = nfs4_commit_done,
8539 .lock = nfs4_proc_lock,
8540 .clear_acl_cache = nfs4_zap_acl_attr,
8541 .close_context = nfs4_close_context,
8542 .open_context = nfs4_atomic_open,
8543 .have_delegation = nfs4_have_delegation,
8544 .return_delegation = nfs4_inode_return_delegation,
8545 .alloc_client = nfs4_alloc_client,
8546 .init_client = nfs4_init_client,
8547 .free_client = nfs4_free_client,
8548 .create_server = nfs4_create_server,
8549 .clone_server = nfs_clone_server,
8550};
8551
8552static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8553 .prefix = XATTR_NAME_NFSV4_ACL,
8554 .list = nfs4_xattr_list_nfs4_acl,
8555 .get = nfs4_xattr_get_nfs4_acl,
8556 .set = nfs4_xattr_set_nfs4_acl,
8557};
8558
8559const struct xattr_handler *nfs4_xattr_handlers[] = {
8560 &nfs4_xattr_nfs4_acl_handler,
8561#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8562 &nfs4_xattr_nfs4_label_handler,
8563#endif
8564 NULL
8565};
8566
8567/*
8568 * Local variables:
8569 * c-basic-offset: 8
8570 * End:
8571 */
Linux 6.x block layer and io_uring tree(s)