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NFSv4.1 Fail data server I/O if stateid represents a lost lock
[linux-2.6-block.git] / fs / nfs / nfs4proc.c
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1/*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/mm.h>
39#include <linux/delay.h>
40#include <linux/errno.h>
41#include <linux/string.h>
42#include <linux/ratelimit.h>
43#include <linux/printk.h>
44#include <linux/slab.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/nfs.h>
47#include <linux/nfs4.h>
48#include <linux/nfs_fs.h>
49#include <linux/nfs_page.h>
50#include <linux/nfs_mount.h>
51#include <linux/namei.h>
52#include <linux/mount.h>
53#include <linux/module.h>
54#include <linux/nfs_idmap.h>
55#include <linux/xattr.h>
56#include <linux/utsname.h>
57#include <linux/freezer.h>
58
59#include "nfs4_fs.h"
60#include "delegation.h"
61#include "internal.h"
62#include "iostat.h"
63#include "callback.h"
64#include "pnfs.h"
65#include "netns.h"
66#include "nfs4session.h"
67#include "fscache.h"
68
69#include "nfs4trace.h"
70
71#define NFSDBG_FACILITY NFSDBG_PROC
72
73#define NFS4_POLL_RETRY_MIN (HZ/10)
74#define NFS4_POLL_RETRY_MAX (15*HZ)
75
76struct nfs4_opendata;
77static int _nfs4_proc_open(struct nfs4_opendata *data);
78static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
79static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
80static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
81static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
82static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
83static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
84static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
85 struct nfs_fattr *fattr, struct iattr *sattr,
86 struct nfs4_state *state, struct nfs4_label *ilabel,
87 struct nfs4_label *olabel);
88#ifdef CONFIG_NFS_V4_1
89static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
90 struct rpc_cred *);
91static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
92 struct rpc_cred *);
93#endif
94
95#ifdef CONFIG_NFS_V4_SECURITY_LABEL
96static inline struct nfs4_label *
97nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
98 struct iattr *sattr, struct nfs4_label *label)
99{
100 int err;
101
102 if (label == NULL)
103 return NULL;
104
105 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
106 return NULL;
107
108 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 int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
318{
319 int res = 0;
320
321 might_sleep();
322
323 if (*timeout <= 0)
324 *timeout = NFS4_POLL_RETRY_MIN;
325 if (*timeout > NFS4_POLL_RETRY_MAX)
326 *timeout = NFS4_POLL_RETRY_MAX;
327 freezable_schedule_timeout_killable_unsafe(*timeout);
328 if (fatal_signal_pending(current))
329 res = -ERESTARTSYS;
330 *timeout <<= 1;
331 return res;
332}
333
334/* This is the error handling routine for processes that are allowed
335 * to sleep.
336 */
337static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
338{
339 struct nfs_client *clp = server->nfs_client;
340 struct nfs4_state *state = exception->state;
341 struct inode *inode = exception->inode;
342 int ret = errorcode;
343
344 exception->retry = 0;
345 switch(errorcode) {
346 case 0:
347 return 0;
348 case -NFS4ERR_OPENMODE:
349 if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
350 nfs4_inode_return_delegation(inode);
351 exception->retry = 1;
352 return 0;
353 }
354 if (state == NULL)
355 break;
356 ret = nfs4_schedule_stateid_recovery(server, state);
357 if (ret < 0)
358 break;
359 goto wait_on_recovery;
360 case -NFS4ERR_DELEG_REVOKED:
361 case -NFS4ERR_ADMIN_REVOKED:
362 case -NFS4ERR_BAD_STATEID:
363 if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
364 nfs_remove_bad_delegation(inode);
365 exception->retry = 1;
366 break;
367 }
368 if (state == NULL)
369 break;
370 ret = nfs4_schedule_stateid_recovery(server, state);
371 if (ret < 0)
372 break;
373 goto wait_on_recovery;
374 case -NFS4ERR_EXPIRED:
375 if (state != NULL) {
376 ret = nfs4_schedule_stateid_recovery(server, state);
377 if (ret < 0)
378 break;
379 }
380 case -NFS4ERR_STALE_STATEID:
381 case -NFS4ERR_STALE_CLIENTID:
382 nfs4_schedule_lease_recovery(clp);
383 goto wait_on_recovery;
384 case -NFS4ERR_MOVED:
385 ret = nfs4_schedule_migration_recovery(server);
386 if (ret < 0)
387 break;
388 goto wait_on_recovery;
389 case -NFS4ERR_LEASE_MOVED:
390 nfs4_schedule_lease_moved_recovery(clp);
391 goto wait_on_recovery;
392#if defined(CONFIG_NFS_V4_1)
393 case -NFS4ERR_BADSESSION:
394 case -NFS4ERR_BADSLOT:
395 case -NFS4ERR_BAD_HIGH_SLOT:
396 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
397 case -NFS4ERR_DEADSESSION:
398 case -NFS4ERR_SEQ_FALSE_RETRY:
399 case -NFS4ERR_SEQ_MISORDERED:
400 dprintk("%s ERROR: %d Reset session\n", __func__,
401 errorcode);
402 nfs4_schedule_session_recovery(clp->cl_session, errorcode);
403 goto wait_on_recovery;
404#endif /* defined(CONFIG_NFS_V4_1) */
405 case -NFS4ERR_FILE_OPEN:
406 if (exception->timeout > HZ) {
407 /* We have retried a decent amount, time to
408 * fail
409 */
410 ret = -EBUSY;
411 break;
412 }
413 case -NFS4ERR_GRACE:
414 case -NFS4ERR_DELAY:
415 ret = nfs4_delay(server->client, &exception->timeout);
416 if (ret != 0)
417 break;
418 case -NFS4ERR_RETRY_UNCACHED_REP:
419 case -NFS4ERR_OLD_STATEID:
420 exception->retry = 1;
421 break;
422 case -NFS4ERR_BADOWNER:
423 /* The following works around a Linux server bug! */
424 case -NFS4ERR_BADNAME:
425 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
426 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
427 exception->retry = 1;
428 printk(KERN_WARNING "NFS: v4 server %s "
429 "does not accept raw "
430 "uid/gids. "
431 "Reenabling the idmapper.\n",
432 server->nfs_client->cl_hostname);
433 }
434 }
435 /* We failed to handle the error */
436 return nfs4_map_errors(ret);
437wait_on_recovery:
438 ret = nfs4_wait_clnt_recover(clp);
439 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
440 return -EIO;
441 if (ret == 0)
442 exception->retry = 1;
443 return ret;
444}
445
446/*
447 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
448 * or 'false' otherwise.
449 */
450static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
451{
452 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
453
454 if (flavor == RPC_AUTH_GSS_KRB5I ||
455 flavor == RPC_AUTH_GSS_KRB5P)
456 return true;
457
458 return false;
459}
460
461static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
462{
463 spin_lock(&clp->cl_lock);
464 if (time_before(clp->cl_last_renewal,timestamp))
465 clp->cl_last_renewal = timestamp;
466 spin_unlock(&clp->cl_lock);
467}
468
469static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
470{
471 do_renew_lease(server->nfs_client, timestamp);
472}
473
474struct nfs4_call_sync_data {
475 const struct nfs_server *seq_server;
476 struct nfs4_sequence_args *seq_args;
477 struct nfs4_sequence_res *seq_res;
478};
479
480static void nfs4_init_sequence(struct nfs4_sequence_args *args,
481 struct nfs4_sequence_res *res, int cache_reply)
482{
483 args->sa_slot = NULL;
484 args->sa_cache_this = cache_reply;
485 args->sa_privileged = 0;
486
487 res->sr_slot = NULL;
488}
489
490static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
491{
492 args->sa_privileged = 1;
493}
494
495static int nfs40_setup_sequence(const struct nfs_server *server,
496 struct nfs4_sequence_args *args,
497 struct nfs4_sequence_res *res,
498 struct rpc_task *task)
499{
500 struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
501 struct nfs4_slot *slot;
502
503 /* slot already allocated? */
504 if (res->sr_slot != NULL)
505 goto out_start;
506
507 spin_lock(&tbl->slot_tbl_lock);
508 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
509 goto out_sleep;
510
511 slot = nfs4_alloc_slot(tbl);
512 if (IS_ERR(slot)) {
513 if (slot == ERR_PTR(-ENOMEM))
514 task->tk_timeout = HZ >> 2;
515 goto out_sleep;
516 }
517 spin_unlock(&tbl->slot_tbl_lock);
518
519 args->sa_slot = slot;
520 res->sr_slot = slot;
521
522out_start:
523 rpc_call_start(task);
524 return 0;
525
526out_sleep:
527 if (args->sa_privileged)
528 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
529 NULL, RPC_PRIORITY_PRIVILEGED);
530 else
531 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
532 spin_unlock(&tbl->slot_tbl_lock);
533 return -EAGAIN;
534}
535
536static int nfs40_sequence_done(struct rpc_task *task,
537 struct nfs4_sequence_res *res)
538{
539 struct nfs4_slot *slot = res->sr_slot;
540 struct nfs4_slot_table *tbl;
541
542 if (slot == NULL)
543 goto out;
544
545 tbl = slot->table;
546 spin_lock(&tbl->slot_tbl_lock);
547 if (!nfs41_wake_and_assign_slot(tbl, slot))
548 nfs4_free_slot(tbl, slot);
549 spin_unlock(&tbl->slot_tbl_lock);
550
551 res->sr_slot = NULL;
552out:
553 return 1;
554}
555
556#if defined(CONFIG_NFS_V4_1)
557
558static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
559{
560 struct nfs4_session *session;
561 struct nfs4_slot_table *tbl;
562 struct nfs4_slot *slot = res->sr_slot;
563 bool send_new_highest_used_slotid = false;
564
565 tbl = slot->table;
566 session = tbl->session;
567
568 spin_lock(&tbl->slot_tbl_lock);
569 /* Be nice to the server: try to ensure that the last transmitted
570 * value for highest_user_slotid <= target_highest_slotid
571 */
572 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
573 send_new_highest_used_slotid = true;
574
575 if (nfs41_wake_and_assign_slot(tbl, slot)) {
576 send_new_highest_used_slotid = false;
577 goto out_unlock;
578 }
579 nfs4_free_slot(tbl, slot);
580
581 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
582 send_new_highest_used_slotid = false;
583out_unlock:
584 spin_unlock(&tbl->slot_tbl_lock);
585 res->sr_slot = NULL;
586 if (send_new_highest_used_slotid)
587 nfs41_server_notify_highest_slotid_update(session->clp);
588}
589
590int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
591{
592 struct nfs4_session *session;
593 struct nfs4_slot *slot = res->sr_slot;
594 struct nfs_client *clp;
595 bool interrupted = false;
596 int ret = 1;
597
598 if (slot == NULL)
599 goto out_noaction;
600 /* don't increment the sequence number if the task wasn't sent */
601 if (!RPC_WAS_SENT(task))
602 goto out;
603
604 session = slot->table->session;
605
606 if (slot->interrupted) {
607 slot->interrupted = 0;
608 interrupted = true;
609 }
610
611 trace_nfs4_sequence_done(session, res);
612 /* Check the SEQUENCE operation status */
613 switch (res->sr_status) {
614 case 0:
615 /* Update the slot's sequence and clientid lease timer */
616 ++slot->seq_nr;
617 clp = session->clp;
618 do_renew_lease(clp, res->sr_timestamp);
619 /* Check sequence flags */
620 if (res->sr_status_flags != 0)
621 nfs4_schedule_lease_recovery(clp);
622 nfs41_update_target_slotid(slot->table, slot, res);
623 break;
624 case 1:
625 /*
626 * sr_status remains 1 if an RPC level error occurred.
627 * The server may or may not have processed the sequence
628 * operation..
629 * Mark the slot as having hosted an interrupted RPC call.
630 */
631 slot->interrupted = 1;
632 goto out;
633 case -NFS4ERR_DELAY:
634 /* The server detected a resend of the RPC call and
635 * returned NFS4ERR_DELAY as per Section 2.10.6.2
636 * of RFC5661.
637 */
638 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
639 __func__,
640 slot->slot_nr,
641 slot->seq_nr);
642 goto out_retry;
643 case -NFS4ERR_BADSLOT:
644 /*
645 * The slot id we used was probably retired. Try again
646 * using a different slot id.
647 */
648 goto retry_nowait;
649 case -NFS4ERR_SEQ_MISORDERED:
650 /*
651 * Was the last operation on this sequence interrupted?
652 * If so, retry after bumping the sequence number.
653 */
654 if (interrupted) {
655 ++slot->seq_nr;
656 goto retry_nowait;
657 }
658 /*
659 * Could this slot have been previously retired?
660 * If so, then the server may be expecting seq_nr = 1!
661 */
662 if (slot->seq_nr != 1) {
663 slot->seq_nr = 1;
664 goto retry_nowait;
665 }
666 break;
667 case -NFS4ERR_SEQ_FALSE_RETRY:
668 ++slot->seq_nr;
669 goto retry_nowait;
670 default:
671 /* Just update the slot sequence no. */
672 ++slot->seq_nr;
673 }
674out:
675 /* The session may be reset by one of the error handlers. */
676 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
677 nfs41_sequence_free_slot(res);
678out_noaction:
679 return ret;
680retry_nowait:
681 if (rpc_restart_call_prepare(task)) {
682 task->tk_status = 0;
683 ret = 0;
684 }
685 goto out;
686out_retry:
687 if (!rpc_restart_call(task))
688 goto out;
689 rpc_delay(task, NFS4_POLL_RETRY_MAX);
690 return 0;
691}
692EXPORT_SYMBOL_GPL(nfs41_sequence_done);
693
694static int nfs4_sequence_done(struct rpc_task *task,
695 struct nfs4_sequence_res *res)
696{
697 if (res->sr_slot == NULL)
698 return 1;
699 if (!res->sr_slot->table->session)
700 return nfs40_sequence_done(task, res);
701 return nfs41_sequence_done(task, res);
702}
703
704int nfs41_setup_sequence(struct nfs4_session *session,
705 struct nfs4_sequence_args *args,
706 struct nfs4_sequence_res *res,
707 struct rpc_task *task)
708{
709 struct nfs4_slot *slot;
710 struct nfs4_slot_table *tbl;
711
712 dprintk("--> %s\n", __func__);
713 /* slot already allocated? */
714 if (res->sr_slot != NULL)
715 goto out_success;
716
717 tbl = &session->fc_slot_table;
718
719 task->tk_timeout = 0;
720
721 spin_lock(&tbl->slot_tbl_lock);
722 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
723 !args->sa_privileged) {
724 /* The state manager will wait until the slot table is empty */
725 dprintk("%s session is draining\n", __func__);
726 goto out_sleep;
727 }
728
729 slot = nfs4_alloc_slot(tbl);
730 if (IS_ERR(slot)) {
731 /* If out of memory, try again in 1/4 second */
732 if (slot == ERR_PTR(-ENOMEM))
733 task->tk_timeout = HZ >> 2;
734 dprintk("<-- %s: no free slots\n", __func__);
735 goto out_sleep;
736 }
737 spin_unlock(&tbl->slot_tbl_lock);
738
739 args->sa_slot = slot;
740
741 dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
742 slot->slot_nr, slot->seq_nr);
743
744 res->sr_slot = slot;
745 res->sr_timestamp = jiffies;
746 res->sr_status_flags = 0;
747 /*
748 * sr_status is only set in decode_sequence, and so will remain
749 * set to 1 if an rpc level failure occurs.
750 */
751 res->sr_status = 1;
752 trace_nfs4_setup_sequence(session, args);
753out_success:
754 rpc_call_start(task);
755 return 0;
756out_sleep:
757 /* Privileged tasks are queued with top priority */
758 if (args->sa_privileged)
759 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
760 NULL, RPC_PRIORITY_PRIVILEGED);
761 else
762 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
763 spin_unlock(&tbl->slot_tbl_lock);
764 return -EAGAIN;
765}
766EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
767
768static int nfs4_setup_sequence(const struct nfs_server *server,
769 struct nfs4_sequence_args *args,
770 struct nfs4_sequence_res *res,
771 struct rpc_task *task)
772{
773 struct nfs4_session *session = nfs4_get_session(server);
774 int ret = 0;
775
776 if (!session)
777 return nfs40_setup_sequence(server, args, res, task);
778
779 dprintk("--> %s clp %p session %p sr_slot %u\n",
780 __func__, session->clp, session, res->sr_slot ?
781 res->sr_slot->slot_nr : NFS4_NO_SLOT);
782
783 ret = nfs41_setup_sequence(session, args, res, task);
784
785 dprintk("<-- %s status=%d\n", __func__, ret);
786 return ret;
787}
788
789static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
790{
791 struct nfs4_call_sync_data *data = calldata;
792 struct nfs4_session *session = nfs4_get_session(data->seq_server);
793
794 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
795
796 nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
797}
798
799static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
800{
801 struct nfs4_call_sync_data *data = calldata;
802
803 nfs41_sequence_done(task, data->seq_res);
804}
805
806static const struct rpc_call_ops nfs41_call_sync_ops = {
807 .rpc_call_prepare = nfs41_call_sync_prepare,
808 .rpc_call_done = nfs41_call_sync_done,
809};
810
811#else /* !CONFIG_NFS_V4_1 */
812
813static int nfs4_setup_sequence(const struct nfs_server *server,
814 struct nfs4_sequence_args *args,
815 struct nfs4_sequence_res *res,
816 struct rpc_task *task)
817{
818 return nfs40_setup_sequence(server, args, res, task);
819}
820
821static int nfs4_sequence_done(struct rpc_task *task,
822 struct nfs4_sequence_res *res)
823{
824 return nfs40_sequence_done(task, res);
825}
826
827#endif /* !CONFIG_NFS_V4_1 */
828
829static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
830{
831 struct nfs4_call_sync_data *data = calldata;
832 nfs4_setup_sequence(data->seq_server,
833 data->seq_args, data->seq_res, task);
834}
835
836static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
837{
838 struct nfs4_call_sync_data *data = calldata;
839 nfs4_sequence_done(task, data->seq_res);
840}
841
842static const struct rpc_call_ops nfs40_call_sync_ops = {
843 .rpc_call_prepare = nfs40_call_sync_prepare,
844 .rpc_call_done = nfs40_call_sync_done,
845};
846
847static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
848 struct nfs_server *server,
849 struct rpc_message *msg,
850 struct nfs4_sequence_args *args,
851 struct nfs4_sequence_res *res)
852{
853 int ret;
854 struct rpc_task *task;
855 struct nfs_client *clp = server->nfs_client;
856 struct nfs4_call_sync_data data = {
857 .seq_server = server,
858 .seq_args = args,
859 .seq_res = res,
860 };
861 struct rpc_task_setup task_setup = {
862 .rpc_client = clnt,
863 .rpc_message = msg,
864 .callback_ops = clp->cl_mvops->call_sync_ops,
865 .callback_data = &data
866 };
867
868 task = rpc_run_task(&task_setup);
869 if (IS_ERR(task))
870 ret = PTR_ERR(task);
871 else {
872 ret = task->tk_status;
873 rpc_put_task(task);
874 }
875 return ret;
876}
877
878static
879int nfs4_call_sync(struct rpc_clnt *clnt,
880 struct nfs_server *server,
881 struct rpc_message *msg,
882 struct nfs4_sequence_args *args,
883 struct nfs4_sequence_res *res,
884 int cache_reply)
885{
886 nfs4_init_sequence(args, res, cache_reply);
887 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
888}
889
890static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
891{
892 struct nfs_inode *nfsi = NFS_I(dir);
893
894 spin_lock(&dir->i_lock);
895 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
896 if (!cinfo->atomic || cinfo->before != dir->i_version)
897 nfs_force_lookup_revalidate(dir);
898 dir->i_version = cinfo->after;
899 nfs_fscache_invalidate(dir);
900 spin_unlock(&dir->i_lock);
901}
902
903struct nfs4_opendata {
904 struct kref kref;
905 struct nfs_openargs o_arg;
906 struct nfs_openres o_res;
907 struct nfs_open_confirmargs c_arg;
908 struct nfs_open_confirmres c_res;
909 struct nfs4_string owner_name;
910 struct nfs4_string group_name;
911 struct nfs_fattr f_attr;
912 struct nfs4_label *f_label;
913 struct dentry *dir;
914 struct dentry *dentry;
915 struct nfs4_state_owner *owner;
916 struct nfs4_state *state;
917 struct iattr attrs;
918 unsigned long timestamp;
919 unsigned int rpc_done : 1;
920 unsigned int file_created : 1;
921 unsigned int is_recover : 1;
922 int rpc_status;
923 int cancelled;
924};
925
926static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
927 int err, struct nfs4_exception *exception)
928{
929 if (err != -EINVAL)
930 return false;
931 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
932 return false;
933 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
934 exception->retry = 1;
935 return true;
936}
937
938static enum open_claim_type4
939nfs4_map_atomic_open_claim(struct nfs_server *server,
940 enum open_claim_type4 claim)
941{
942 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
943 return claim;
944 switch (claim) {
945 default:
946 return claim;
947 case NFS4_OPEN_CLAIM_FH:
948 return NFS4_OPEN_CLAIM_NULL;
949 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
950 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
951 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
952 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
953 }
954}
955
956static void nfs4_init_opendata_res(struct nfs4_opendata *p)
957{
958 p->o_res.f_attr = &p->f_attr;
959 p->o_res.f_label = p->f_label;
960 p->o_res.seqid = p->o_arg.seqid;
961 p->c_res.seqid = p->c_arg.seqid;
962 p->o_res.server = p->o_arg.server;
963 p->o_res.access_request = p->o_arg.access;
964 nfs_fattr_init(&p->f_attr);
965 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
966}
967
968static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
969 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
970 const struct iattr *attrs,
971 struct nfs4_label *label,
972 enum open_claim_type4 claim,
973 gfp_t gfp_mask)
974{
975 struct dentry *parent = dget_parent(dentry);
976 struct inode *dir = parent->d_inode;
977 struct nfs_server *server = NFS_SERVER(dir);
978 struct nfs4_opendata *p;
979
980 p = kzalloc(sizeof(*p), gfp_mask);
981 if (p == NULL)
982 goto err;
983
984 p->f_label = nfs4_label_alloc(server, gfp_mask);
985 if (IS_ERR(p->f_label))
986 goto err_free_p;
987
988 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
989 if (p->o_arg.seqid == NULL)
990 goto err_free_label;
991 nfs_sb_active(dentry->d_sb);
992 p->dentry = dget(dentry);
993 p->dir = parent;
994 p->owner = sp;
995 atomic_inc(&sp->so_count);
996 p->o_arg.open_flags = flags;
997 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
998 /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
999 * will return permission denied for all bits until close */
1000 if (!(flags & O_EXCL)) {
1001 /* ask server to check for all possible rights as results
1002 * are cached */
1003 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1004 NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1005 }
1006 p->o_arg.clientid = server->nfs_client->cl_clientid;
1007 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1008 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1009 p->o_arg.name = &dentry->d_name;
1010 p->o_arg.server = server;
1011 p->o_arg.bitmask = nfs4_bitmask(server, label);
1012 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1013 p->o_arg.label = label;
1014 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1015 switch (p->o_arg.claim) {
1016 case NFS4_OPEN_CLAIM_NULL:
1017 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1018 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1019 p->o_arg.fh = NFS_FH(dir);
1020 break;
1021 case NFS4_OPEN_CLAIM_PREVIOUS:
1022 case NFS4_OPEN_CLAIM_FH:
1023 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1024 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1025 p->o_arg.fh = NFS_FH(dentry->d_inode);
1026 }
1027 if (attrs != NULL && attrs->ia_valid != 0) {
1028 __u32 verf[2];
1029
1030 p->o_arg.u.attrs = &p->attrs;
1031 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1032
1033 verf[0] = jiffies;
1034 verf[1] = current->pid;
1035 memcpy(p->o_arg.u.verifier.data, verf,
1036 sizeof(p->o_arg.u.verifier.data));
1037 }
1038 p->c_arg.fh = &p->o_res.fh;
1039 p->c_arg.stateid = &p->o_res.stateid;
1040 p->c_arg.seqid = p->o_arg.seqid;
1041 nfs4_init_opendata_res(p);
1042 kref_init(&p->kref);
1043 return p;
1044
1045err_free_label:
1046 nfs4_label_free(p->f_label);
1047err_free_p:
1048 kfree(p);
1049err:
1050 dput(parent);
1051 return NULL;
1052}
1053
1054static void nfs4_opendata_free(struct kref *kref)
1055{
1056 struct nfs4_opendata *p = container_of(kref,
1057 struct nfs4_opendata, kref);
1058 struct super_block *sb = p->dentry->d_sb;
1059
1060 nfs_free_seqid(p->o_arg.seqid);
1061 if (p->state != NULL)
1062 nfs4_put_open_state(p->state);
1063 nfs4_put_state_owner(p->owner);
1064
1065 nfs4_label_free(p->f_label);
1066
1067 dput(p->dir);
1068 dput(p->dentry);
1069 nfs_sb_deactive(sb);
1070 nfs_fattr_free_names(&p->f_attr);
1071 kfree(p);
1072}
1073
1074static void nfs4_opendata_put(struct nfs4_opendata *p)
1075{
1076 if (p != NULL)
1077 kref_put(&p->kref, nfs4_opendata_free);
1078}
1079
1080static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1081{
1082 int ret;
1083
1084 ret = rpc_wait_for_completion_task(task);
1085 return ret;
1086}
1087
1088static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1089{
1090 int ret = 0;
1091
1092 if (open_mode & (O_EXCL|O_TRUNC))
1093 goto out;
1094 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1095 case FMODE_READ:
1096 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1097 && state->n_rdonly != 0;
1098 break;
1099 case FMODE_WRITE:
1100 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1101 && state->n_wronly != 0;
1102 break;
1103 case FMODE_READ|FMODE_WRITE:
1104 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1105 && state->n_rdwr != 0;
1106 }
1107out:
1108 return ret;
1109}
1110
1111static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1112{
1113 if (delegation == NULL)
1114 return 0;
1115 if ((delegation->type & fmode) != fmode)
1116 return 0;
1117 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1118 return 0;
1119 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1120 return 0;
1121 nfs_mark_delegation_referenced(delegation);
1122 return 1;
1123}
1124
1125static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1126{
1127 switch (fmode) {
1128 case FMODE_WRITE:
1129 state->n_wronly++;
1130 break;
1131 case FMODE_READ:
1132 state->n_rdonly++;
1133 break;
1134 case FMODE_READ|FMODE_WRITE:
1135 state->n_rdwr++;
1136 }
1137 nfs4_state_set_mode_locked(state, state->state | fmode);
1138}
1139
1140static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1141{
1142 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1143 nfs4_stateid_copy(&state->stateid, stateid);
1144 nfs4_stateid_copy(&state->open_stateid, stateid);
1145 set_bit(NFS_OPEN_STATE, &state->flags);
1146 switch (fmode) {
1147 case FMODE_READ:
1148 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1149 break;
1150 case FMODE_WRITE:
1151 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1152 break;
1153 case FMODE_READ|FMODE_WRITE:
1154 set_bit(NFS_O_RDWR_STATE, &state->flags);
1155 }
1156}
1157
1158static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1159{
1160 write_seqlock(&state->seqlock);
1161 nfs_set_open_stateid_locked(state, stateid, fmode);
1162 write_sequnlock(&state->seqlock);
1163}
1164
1165static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1166{
1167 /*
1168 * Protect the call to nfs4_state_set_mode_locked and
1169 * serialise the stateid update
1170 */
1171 write_seqlock(&state->seqlock);
1172 if (deleg_stateid != NULL) {
1173 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1174 set_bit(NFS_DELEGATED_STATE, &state->flags);
1175 }
1176 if (open_stateid != NULL)
1177 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1178 write_sequnlock(&state->seqlock);
1179 spin_lock(&state->owner->so_lock);
1180 update_open_stateflags(state, fmode);
1181 spin_unlock(&state->owner->so_lock);
1182}
1183
1184static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1185{
1186 struct nfs_inode *nfsi = NFS_I(state->inode);
1187 struct nfs_delegation *deleg_cur;
1188 int ret = 0;
1189
1190 fmode &= (FMODE_READ|FMODE_WRITE);
1191
1192 rcu_read_lock();
1193 deleg_cur = rcu_dereference(nfsi->delegation);
1194 if (deleg_cur == NULL)
1195 goto no_delegation;
1196
1197 spin_lock(&deleg_cur->lock);
1198 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1199 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1200 (deleg_cur->type & fmode) != fmode)
1201 goto no_delegation_unlock;
1202
1203 if (delegation == NULL)
1204 delegation = &deleg_cur->stateid;
1205 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1206 goto no_delegation_unlock;
1207
1208 nfs_mark_delegation_referenced(deleg_cur);
1209 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1210 ret = 1;
1211no_delegation_unlock:
1212 spin_unlock(&deleg_cur->lock);
1213no_delegation:
1214 rcu_read_unlock();
1215
1216 if (!ret && open_stateid != NULL) {
1217 __update_open_stateid(state, open_stateid, NULL, fmode);
1218 ret = 1;
1219 }
1220
1221 return ret;
1222}
1223
1224
1225static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1226{
1227 struct nfs_delegation *delegation;
1228
1229 rcu_read_lock();
1230 delegation = rcu_dereference(NFS_I(inode)->delegation);
1231 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1232 rcu_read_unlock();
1233 return;
1234 }
1235 rcu_read_unlock();
1236 nfs4_inode_return_delegation(inode);
1237}
1238
1239static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1240{
1241 struct nfs4_state *state = opendata->state;
1242 struct nfs_inode *nfsi = NFS_I(state->inode);
1243 struct nfs_delegation *delegation;
1244 int open_mode = opendata->o_arg.open_flags;
1245 fmode_t fmode = opendata->o_arg.fmode;
1246 nfs4_stateid stateid;
1247 int ret = -EAGAIN;
1248
1249 for (;;) {
1250 if (can_open_cached(state, fmode, open_mode)) {
1251 spin_lock(&state->owner->so_lock);
1252 if (can_open_cached(state, fmode, open_mode)) {
1253 update_open_stateflags(state, fmode);
1254 spin_unlock(&state->owner->so_lock);
1255 goto out_return_state;
1256 }
1257 spin_unlock(&state->owner->so_lock);
1258 }
1259 rcu_read_lock();
1260 delegation = rcu_dereference(nfsi->delegation);
1261 if (!can_open_delegated(delegation, fmode)) {
1262 rcu_read_unlock();
1263 break;
1264 }
1265 /* Save the delegation */
1266 nfs4_stateid_copy(&stateid, &delegation->stateid);
1267 rcu_read_unlock();
1268 nfs_release_seqid(opendata->o_arg.seqid);
1269 if (!opendata->is_recover) {
1270 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1271 if (ret != 0)
1272 goto out;
1273 }
1274 ret = -EAGAIN;
1275
1276 /* Try to update the stateid using the delegation */
1277 if (update_open_stateid(state, NULL, &stateid, fmode))
1278 goto out_return_state;
1279 }
1280out:
1281 return ERR_PTR(ret);
1282out_return_state:
1283 atomic_inc(&state->count);
1284 return state;
1285}
1286
1287static void
1288nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1289{
1290 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1291 struct nfs_delegation *delegation;
1292 int delegation_flags = 0;
1293
1294 rcu_read_lock();
1295 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1296 if (delegation)
1297 delegation_flags = delegation->flags;
1298 rcu_read_unlock();
1299 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1300 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1301 "returning a delegation for "
1302 "OPEN(CLAIM_DELEGATE_CUR)\n",
1303 clp->cl_hostname);
1304 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1305 nfs_inode_set_delegation(state->inode,
1306 data->owner->so_cred,
1307 &data->o_res);
1308 else
1309 nfs_inode_reclaim_delegation(state->inode,
1310 data->owner->so_cred,
1311 &data->o_res);
1312}
1313
1314/*
1315 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1316 * and update the nfs4_state.
1317 */
1318static struct nfs4_state *
1319_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1320{
1321 struct inode *inode = data->state->inode;
1322 struct nfs4_state *state = data->state;
1323 int ret;
1324
1325 if (!data->rpc_done) {
1326 if (data->rpc_status) {
1327 ret = data->rpc_status;
1328 goto err;
1329 }
1330 /* cached opens have already been processed */
1331 goto update;
1332 }
1333
1334 ret = nfs_refresh_inode(inode, &data->f_attr);
1335 if (ret)
1336 goto err;
1337
1338 if (data->o_res.delegation_type != 0)
1339 nfs4_opendata_check_deleg(data, state);
1340update:
1341 update_open_stateid(state, &data->o_res.stateid, NULL,
1342 data->o_arg.fmode);
1343 atomic_inc(&state->count);
1344
1345 return state;
1346err:
1347 return ERR_PTR(ret);
1348
1349}
1350
1351static struct nfs4_state *
1352_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1353{
1354 struct inode *inode;
1355 struct nfs4_state *state = NULL;
1356 int ret;
1357
1358 if (!data->rpc_done) {
1359 state = nfs4_try_open_cached(data);
1360 goto out;
1361 }
1362
1363 ret = -EAGAIN;
1364 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1365 goto err;
1366 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1367 ret = PTR_ERR(inode);
1368 if (IS_ERR(inode))
1369 goto err;
1370 ret = -ENOMEM;
1371 state = nfs4_get_open_state(inode, data->owner);
1372 if (state == NULL)
1373 goto err_put_inode;
1374 if (data->o_res.delegation_type != 0)
1375 nfs4_opendata_check_deleg(data, state);
1376 update_open_stateid(state, &data->o_res.stateid, NULL,
1377 data->o_arg.fmode);
1378 iput(inode);
1379out:
1380 nfs_release_seqid(data->o_arg.seqid);
1381 return state;
1382err_put_inode:
1383 iput(inode);
1384err:
1385 return ERR_PTR(ret);
1386}
1387
1388static struct nfs4_state *
1389nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1390{
1391 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1392 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1393 return _nfs4_opendata_to_nfs4_state(data);
1394}
1395
1396static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1397{
1398 struct nfs_inode *nfsi = NFS_I(state->inode);
1399 struct nfs_open_context *ctx;
1400
1401 spin_lock(&state->inode->i_lock);
1402 list_for_each_entry(ctx, &nfsi->open_files, list) {
1403 if (ctx->state != state)
1404 continue;
1405 get_nfs_open_context(ctx);
1406 spin_unlock(&state->inode->i_lock);
1407 return ctx;
1408 }
1409 spin_unlock(&state->inode->i_lock);
1410 return ERR_PTR(-ENOENT);
1411}
1412
1413static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1414 struct nfs4_state *state, enum open_claim_type4 claim)
1415{
1416 struct nfs4_opendata *opendata;
1417
1418 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1419 NULL, NULL, claim, GFP_NOFS);
1420 if (opendata == NULL)
1421 return ERR_PTR(-ENOMEM);
1422 opendata->state = state;
1423 atomic_inc(&state->count);
1424 return opendata;
1425}
1426
1427static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1428{
1429 struct nfs4_state *newstate;
1430 int ret;
1431
1432 opendata->o_arg.open_flags = 0;
1433 opendata->o_arg.fmode = fmode;
1434 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1435 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1436 nfs4_init_opendata_res(opendata);
1437 ret = _nfs4_recover_proc_open(opendata);
1438 if (ret != 0)
1439 return ret;
1440 newstate = nfs4_opendata_to_nfs4_state(opendata);
1441 if (IS_ERR(newstate))
1442 return PTR_ERR(newstate);
1443 nfs4_close_state(newstate, fmode);
1444 *res = newstate;
1445 return 0;
1446}
1447
1448static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1449{
1450 struct nfs4_state *newstate;
1451 int ret;
1452
1453 /* memory barrier prior to reading state->n_* */
1454 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1455 clear_bit(NFS_OPEN_STATE, &state->flags);
1456 smp_rmb();
1457 if (state->n_rdwr != 0) {
1458 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1459 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1460 if (ret != 0)
1461 return ret;
1462 if (newstate != state)
1463 return -ESTALE;
1464 }
1465 if (state->n_wronly != 0) {
1466 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1467 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1468 if (ret != 0)
1469 return ret;
1470 if (newstate != state)
1471 return -ESTALE;
1472 }
1473 if (state->n_rdonly != 0) {
1474 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1475 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1476 if (ret != 0)
1477 return ret;
1478 if (newstate != state)
1479 return -ESTALE;
1480 }
1481 /*
1482 * We may have performed cached opens for all three recoveries.
1483 * Check if we need to update the current stateid.
1484 */
1485 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1486 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1487 write_seqlock(&state->seqlock);
1488 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1489 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1490 write_sequnlock(&state->seqlock);
1491 }
1492 return 0;
1493}
1494
1495/*
1496 * OPEN_RECLAIM:
1497 * reclaim state on the server after a reboot.
1498 */
1499static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1500{
1501 struct nfs_delegation *delegation;
1502 struct nfs4_opendata *opendata;
1503 fmode_t delegation_type = 0;
1504 int status;
1505
1506 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1507 NFS4_OPEN_CLAIM_PREVIOUS);
1508 if (IS_ERR(opendata))
1509 return PTR_ERR(opendata);
1510 rcu_read_lock();
1511 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1512 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1513 delegation_type = delegation->type;
1514 rcu_read_unlock();
1515 opendata->o_arg.u.delegation_type = delegation_type;
1516 status = nfs4_open_recover(opendata, state);
1517 nfs4_opendata_put(opendata);
1518 return status;
1519}
1520
1521static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1522{
1523 struct nfs_server *server = NFS_SERVER(state->inode);
1524 struct nfs4_exception exception = { };
1525 int err;
1526 do {
1527 err = _nfs4_do_open_reclaim(ctx, state);
1528 trace_nfs4_open_reclaim(ctx, 0, err);
1529 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1530 continue;
1531 if (err != -NFS4ERR_DELAY)
1532 break;
1533 nfs4_handle_exception(server, err, &exception);
1534 } while (exception.retry);
1535 return err;
1536}
1537
1538static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1539{
1540 struct nfs_open_context *ctx;
1541 int ret;
1542
1543 ctx = nfs4_state_find_open_context(state);
1544 if (IS_ERR(ctx))
1545 return -EAGAIN;
1546 ret = nfs4_do_open_reclaim(ctx, state);
1547 put_nfs_open_context(ctx);
1548 return ret;
1549}
1550
1551static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1552{
1553 switch (err) {
1554 default:
1555 printk(KERN_ERR "NFS: %s: unhandled error "
1556 "%d.\n", __func__, err);
1557 case 0:
1558 case -ENOENT:
1559 case -ESTALE:
1560 break;
1561 case -NFS4ERR_BADSESSION:
1562 case -NFS4ERR_BADSLOT:
1563 case -NFS4ERR_BAD_HIGH_SLOT:
1564 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1565 case -NFS4ERR_DEADSESSION:
1566 set_bit(NFS_DELEGATED_STATE, &state->flags);
1567 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1568 return -EAGAIN;
1569 case -NFS4ERR_STALE_CLIENTID:
1570 case -NFS4ERR_STALE_STATEID:
1571 set_bit(NFS_DELEGATED_STATE, &state->flags);
1572 case -NFS4ERR_EXPIRED:
1573 /* Don't recall a delegation if it was lost */
1574 nfs4_schedule_lease_recovery(server->nfs_client);
1575 return -EAGAIN;
1576 case -NFS4ERR_MOVED:
1577 nfs4_schedule_migration_recovery(server);
1578 return -EAGAIN;
1579 case -NFS4ERR_LEASE_MOVED:
1580 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1581 return -EAGAIN;
1582 case -NFS4ERR_DELEG_REVOKED:
1583 case -NFS4ERR_ADMIN_REVOKED:
1584 case -NFS4ERR_BAD_STATEID:
1585 case -NFS4ERR_OPENMODE:
1586 nfs_inode_find_state_and_recover(state->inode,
1587 stateid);
1588 nfs4_schedule_stateid_recovery(server, state);
1589 return 0;
1590 case -NFS4ERR_DELAY:
1591 case -NFS4ERR_GRACE:
1592 set_bit(NFS_DELEGATED_STATE, &state->flags);
1593 ssleep(1);
1594 return -EAGAIN;
1595 case -ENOMEM:
1596 case -NFS4ERR_DENIED:
1597 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1598 return 0;
1599 }
1600 return err;
1601}
1602
1603int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1604{
1605 struct nfs_server *server = NFS_SERVER(state->inode);
1606 struct nfs4_opendata *opendata;
1607 int err;
1608
1609 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1610 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1611 if (IS_ERR(opendata))
1612 return PTR_ERR(opendata);
1613 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1614 err = nfs4_open_recover(opendata, state);
1615 nfs4_opendata_put(opendata);
1616 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1617}
1618
1619static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1620{
1621 struct nfs4_opendata *data = calldata;
1622
1623 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1624 &data->c_res.seq_res, task);
1625}
1626
1627static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1628{
1629 struct nfs4_opendata *data = calldata;
1630
1631 nfs40_sequence_done(task, &data->c_res.seq_res);
1632
1633 data->rpc_status = task->tk_status;
1634 if (data->rpc_status == 0) {
1635 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1636 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1637 renew_lease(data->o_res.server, data->timestamp);
1638 data->rpc_done = 1;
1639 }
1640}
1641
1642static void nfs4_open_confirm_release(void *calldata)
1643{
1644 struct nfs4_opendata *data = calldata;
1645 struct nfs4_state *state = NULL;
1646
1647 /* If this request hasn't been cancelled, do nothing */
1648 if (data->cancelled == 0)
1649 goto out_free;
1650 /* In case of error, no cleanup! */
1651 if (!data->rpc_done)
1652 goto out_free;
1653 state = nfs4_opendata_to_nfs4_state(data);
1654 if (!IS_ERR(state))
1655 nfs4_close_state(state, data->o_arg.fmode);
1656out_free:
1657 nfs4_opendata_put(data);
1658}
1659
1660static const struct rpc_call_ops nfs4_open_confirm_ops = {
1661 .rpc_call_prepare = nfs4_open_confirm_prepare,
1662 .rpc_call_done = nfs4_open_confirm_done,
1663 .rpc_release = nfs4_open_confirm_release,
1664};
1665
1666/*
1667 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1668 */
1669static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1670{
1671 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1672 struct rpc_task *task;
1673 struct rpc_message msg = {
1674 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1675 .rpc_argp = &data->c_arg,
1676 .rpc_resp = &data->c_res,
1677 .rpc_cred = data->owner->so_cred,
1678 };
1679 struct rpc_task_setup task_setup_data = {
1680 .rpc_client = server->client,
1681 .rpc_message = &msg,
1682 .callback_ops = &nfs4_open_confirm_ops,
1683 .callback_data = data,
1684 .workqueue = nfsiod_workqueue,
1685 .flags = RPC_TASK_ASYNC,
1686 };
1687 int status;
1688
1689 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1690 kref_get(&data->kref);
1691 data->rpc_done = 0;
1692 data->rpc_status = 0;
1693 data->timestamp = jiffies;
1694 task = rpc_run_task(&task_setup_data);
1695 if (IS_ERR(task))
1696 return PTR_ERR(task);
1697 status = nfs4_wait_for_completion_rpc_task(task);
1698 if (status != 0) {
1699 data->cancelled = 1;
1700 smp_wmb();
1701 } else
1702 status = data->rpc_status;
1703 rpc_put_task(task);
1704 return status;
1705}
1706
1707static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1708{
1709 struct nfs4_opendata *data = calldata;
1710 struct nfs4_state_owner *sp = data->owner;
1711 struct nfs_client *clp = sp->so_server->nfs_client;
1712
1713 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1714 goto out_wait;
1715 /*
1716 * Check if we still need to send an OPEN call, or if we can use
1717 * a delegation instead.
1718 */
1719 if (data->state != NULL) {
1720 struct nfs_delegation *delegation;
1721
1722 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1723 goto out_no_action;
1724 rcu_read_lock();
1725 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1726 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1727 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1728 can_open_delegated(delegation, data->o_arg.fmode))
1729 goto unlock_no_action;
1730 rcu_read_unlock();
1731 }
1732 /* Update client id. */
1733 data->o_arg.clientid = clp->cl_clientid;
1734 switch (data->o_arg.claim) {
1735 case NFS4_OPEN_CLAIM_PREVIOUS:
1736 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1737 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1738 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1739 case NFS4_OPEN_CLAIM_FH:
1740 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1741 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1742 }
1743 data->timestamp = jiffies;
1744 if (nfs4_setup_sequence(data->o_arg.server,
1745 &data->o_arg.seq_args,
1746 &data->o_res.seq_res,
1747 task) != 0)
1748 nfs_release_seqid(data->o_arg.seqid);
1749
1750 /* Set the create mode (note dependency on the session type) */
1751 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1752 if (data->o_arg.open_flags & O_EXCL) {
1753 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1754 if (nfs4_has_persistent_session(clp))
1755 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1756 else if (clp->cl_mvops->minor_version > 0)
1757 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1758 }
1759 return;
1760unlock_no_action:
1761 rcu_read_unlock();
1762out_no_action:
1763 task->tk_action = NULL;
1764out_wait:
1765 nfs4_sequence_done(task, &data->o_res.seq_res);
1766}
1767
1768static void nfs4_open_done(struct rpc_task *task, void *calldata)
1769{
1770 struct nfs4_opendata *data = calldata;
1771
1772 data->rpc_status = task->tk_status;
1773
1774 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1775 return;
1776
1777 if (task->tk_status == 0) {
1778 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1779 switch (data->o_res.f_attr->mode & S_IFMT) {
1780 case S_IFREG:
1781 break;
1782 case S_IFLNK:
1783 data->rpc_status = -ELOOP;
1784 break;
1785 case S_IFDIR:
1786 data->rpc_status = -EISDIR;
1787 break;
1788 default:
1789 data->rpc_status = -ENOTDIR;
1790 }
1791 }
1792 renew_lease(data->o_res.server, data->timestamp);
1793 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1794 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1795 }
1796 data->rpc_done = 1;
1797}
1798
1799static void nfs4_open_release(void *calldata)
1800{
1801 struct nfs4_opendata *data = calldata;
1802 struct nfs4_state *state = NULL;
1803
1804 /* If this request hasn't been cancelled, do nothing */
1805 if (data->cancelled == 0)
1806 goto out_free;
1807 /* In case of error, no cleanup! */
1808 if (data->rpc_status != 0 || !data->rpc_done)
1809 goto out_free;
1810 /* In case we need an open_confirm, no cleanup! */
1811 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1812 goto out_free;
1813 state = nfs4_opendata_to_nfs4_state(data);
1814 if (!IS_ERR(state))
1815 nfs4_close_state(state, data->o_arg.fmode);
1816out_free:
1817 nfs4_opendata_put(data);
1818}
1819
1820static const struct rpc_call_ops nfs4_open_ops = {
1821 .rpc_call_prepare = nfs4_open_prepare,
1822 .rpc_call_done = nfs4_open_done,
1823 .rpc_release = nfs4_open_release,
1824};
1825
1826static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1827{
1828 struct inode *dir = data->dir->d_inode;
1829 struct nfs_server *server = NFS_SERVER(dir);
1830 struct nfs_openargs *o_arg = &data->o_arg;
1831 struct nfs_openres *o_res = &data->o_res;
1832 struct rpc_task *task;
1833 struct rpc_message msg = {
1834 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1835 .rpc_argp = o_arg,
1836 .rpc_resp = o_res,
1837 .rpc_cred = data->owner->so_cred,
1838 };
1839 struct rpc_task_setup task_setup_data = {
1840 .rpc_client = server->client,
1841 .rpc_message = &msg,
1842 .callback_ops = &nfs4_open_ops,
1843 .callback_data = data,
1844 .workqueue = nfsiod_workqueue,
1845 .flags = RPC_TASK_ASYNC,
1846 };
1847 int status;
1848
1849 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1850 kref_get(&data->kref);
1851 data->rpc_done = 0;
1852 data->rpc_status = 0;
1853 data->cancelled = 0;
1854 data->is_recover = 0;
1855 if (isrecover) {
1856 nfs4_set_sequence_privileged(&o_arg->seq_args);
1857 data->is_recover = 1;
1858 }
1859 task = rpc_run_task(&task_setup_data);
1860 if (IS_ERR(task))
1861 return PTR_ERR(task);
1862 status = nfs4_wait_for_completion_rpc_task(task);
1863 if (status != 0) {
1864 data->cancelled = 1;
1865 smp_wmb();
1866 } else
1867 status = data->rpc_status;
1868 rpc_put_task(task);
1869
1870 return status;
1871}
1872
1873static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1874{
1875 struct inode *dir = data->dir->d_inode;
1876 struct nfs_openres *o_res = &data->o_res;
1877 int status;
1878
1879 status = nfs4_run_open_task(data, 1);
1880 if (status != 0 || !data->rpc_done)
1881 return status;
1882
1883 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1884
1885 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1886 status = _nfs4_proc_open_confirm(data);
1887 if (status != 0)
1888 return status;
1889 }
1890
1891 return status;
1892}
1893
1894static int nfs4_opendata_access(struct rpc_cred *cred,
1895 struct nfs4_opendata *opendata,
1896 struct nfs4_state *state, fmode_t fmode,
1897 int openflags)
1898{
1899 struct nfs_access_entry cache;
1900 u32 mask;
1901
1902 /* access call failed or for some reason the server doesn't
1903 * support any access modes -- defer access call until later */
1904 if (opendata->o_res.access_supported == 0)
1905 return 0;
1906
1907 mask = 0;
1908 /* don't check MAY_WRITE - a newly created file may not have
1909 * write mode bits, but POSIX allows the creating process to write.
1910 * use openflags to check for exec, because fmode won't
1911 * always have FMODE_EXEC set when file open for exec. */
1912 if (openflags & __FMODE_EXEC) {
1913 /* ONLY check for exec rights */
1914 mask = MAY_EXEC;
1915 } else if (fmode & FMODE_READ)
1916 mask = MAY_READ;
1917
1918 cache.cred = cred;
1919 cache.jiffies = jiffies;
1920 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1921 nfs_access_add_cache(state->inode, &cache);
1922
1923 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1924 return 0;
1925
1926 /* even though OPEN succeeded, access is denied. Close the file */
1927 nfs4_close_state(state, fmode);
1928 return -EACCES;
1929}
1930
1931/*
1932 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1933 */
1934static int _nfs4_proc_open(struct nfs4_opendata *data)
1935{
1936 struct inode *dir = data->dir->d_inode;
1937 struct nfs_server *server = NFS_SERVER(dir);
1938 struct nfs_openargs *o_arg = &data->o_arg;
1939 struct nfs_openres *o_res = &data->o_res;
1940 int status;
1941
1942 status = nfs4_run_open_task(data, 0);
1943 if (!data->rpc_done)
1944 return status;
1945 if (status != 0) {
1946 if (status == -NFS4ERR_BADNAME &&
1947 !(o_arg->open_flags & O_CREAT))
1948 return -ENOENT;
1949 return status;
1950 }
1951
1952 nfs_fattr_map_and_free_names(server, &data->f_attr);
1953
1954 if (o_arg->open_flags & O_CREAT) {
1955 update_changeattr(dir, &o_res->cinfo);
1956 if (o_arg->open_flags & O_EXCL)
1957 data->file_created = 1;
1958 else if (o_res->cinfo.before != o_res->cinfo.after)
1959 data->file_created = 1;
1960 }
1961 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1962 server->caps &= ~NFS_CAP_POSIX_LOCK;
1963 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1964 status = _nfs4_proc_open_confirm(data);
1965 if (status != 0)
1966 return status;
1967 }
1968 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1969 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1970 return 0;
1971}
1972
1973static int nfs4_recover_expired_lease(struct nfs_server *server)
1974{
1975 return nfs4_client_recover_expired_lease(server->nfs_client);
1976}
1977
1978/*
1979 * OPEN_EXPIRED:
1980 * reclaim state on the server after a network partition.
1981 * Assumes caller holds the appropriate lock
1982 */
1983static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1984{
1985 struct nfs4_opendata *opendata;
1986 int ret;
1987
1988 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1989 NFS4_OPEN_CLAIM_FH);
1990 if (IS_ERR(opendata))
1991 return PTR_ERR(opendata);
1992 ret = nfs4_open_recover(opendata, state);
1993 if (ret == -ESTALE)
1994 d_drop(ctx->dentry);
1995 nfs4_opendata_put(opendata);
1996 return ret;
1997}
1998
1999static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2000{
2001 struct nfs_server *server = NFS_SERVER(state->inode);
2002 struct nfs4_exception exception = { };
2003 int err;
2004
2005 do {
2006 err = _nfs4_open_expired(ctx, state);
2007 trace_nfs4_open_expired(ctx, 0, err);
2008 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2009 continue;
2010 switch (err) {
2011 default:
2012 goto out;
2013 case -NFS4ERR_GRACE:
2014 case -NFS4ERR_DELAY:
2015 nfs4_handle_exception(server, err, &exception);
2016 err = 0;
2017 }
2018 } while (exception.retry);
2019out:
2020 return err;
2021}
2022
2023static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2024{
2025 struct nfs_open_context *ctx;
2026 int ret;
2027
2028 ctx = nfs4_state_find_open_context(state);
2029 if (IS_ERR(ctx))
2030 return -EAGAIN;
2031 ret = nfs4_do_open_expired(ctx, state);
2032 put_nfs_open_context(ctx);
2033 return ret;
2034}
2035
2036#if defined(CONFIG_NFS_V4_1)
2037static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2038{
2039 struct nfs_server *server = NFS_SERVER(state->inode);
2040 nfs4_stateid *stateid = &state->stateid;
2041 struct nfs_delegation *delegation;
2042 struct rpc_cred *cred = NULL;
2043 int status = -NFS4ERR_BAD_STATEID;
2044
2045 /* If a state reset has been done, test_stateid is unneeded */
2046 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2047 return;
2048
2049 /* Get the delegation credential for use by test/free_stateid */
2050 rcu_read_lock();
2051 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2052 if (delegation != NULL &&
2053 nfs4_stateid_match(&delegation->stateid, stateid)) {
2054 cred = get_rpccred(delegation->cred);
2055 rcu_read_unlock();
2056 status = nfs41_test_stateid(server, stateid, cred);
2057 trace_nfs4_test_delegation_stateid(state, NULL, status);
2058 } else
2059 rcu_read_unlock();
2060
2061 if (status != NFS_OK) {
2062 /* Free the stateid unless the server explicitly
2063 * informs us the stateid is unrecognized. */
2064 if (status != -NFS4ERR_BAD_STATEID)
2065 nfs41_free_stateid(server, stateid, cred);
2066 nfs_remove_bad_delegation(state->inode);
2067
2068 write_seqlock(&state->seqlock);
2069 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2070 write_sequnlock(&state->seqlock);
2071 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2072 }
2073
2074 if (cred != NULL)
2075 put_rpccred(cred);
2076}
2077
2078/**
2079 * nfs41_check_open_stateid - possibly free an open stateid
2080 *
2081 * @state: NFSv4 state for an inode
2082 *
2083 * Returns NFS_OK if recovery for this stateid is now finished.
2084 * Otherwise a negative NFS4ERR value is returned.
2085 */
2086static int nfs41_check_open_stateid(struct nfs4_state *state)
2087{
2088 struct nfs_server *server = NFS_SERVER(state->inode);
2089 nfs4_stateid *stateid = &state->open_stateid;
2090 struct rpc_cred *cred = state->owner->so_cred;
2091 int status;
2092
2093 /* If a state reset has been done, test_stateid is unneeded */
2094 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2095 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2096 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2097 return -NFS4ERR_BAD_STATEID;
2098
2099 status = nfs41_test_stateid(server, stateid, cred);
2100 trace_nfs4_test_open_stateid(state, NULL, status);
2101 if (status != NFS_OK) {
2102 /* Free the stateid unless the server explicitly
2103 * informs us the stateid is unrecognized. */
2104 if (status != -NFS4ERR_BAD_STATEID)
2105 nfs41_free_stateid(server, stateid, cred);
2106
2107 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2108 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2109 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2110 clear_bit(NFS_OPEN_STATE, &state->flags);
2111 }
2112 return status;
2113}
2114
2115static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2116{
2117 int status;
2118
2119 nfs41_clear_delegation_stateid(state);
2120 status = nfs41_check_open_stateid(state);
2121 if (status != NFS_OK)
2122 status = nfs4_open_expired(sp, state);
2123 return status;
2124}
2125#endif
2126
2127/*
2128 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2129 * fields corresponding to attributes that were used to store the verifier.
2130 * Make sure we clobber those fields in the later setattr call
2131 */
2132static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2133{
2134 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2135 !(sattr->ia_valid & ATTR_ATIME_SET))
2136 sattr->ia_valid |= ATTR_ATIME;
2137
2138 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2139 !(sattr->ia_valid & ATTR_MTIME_SET))
2140 sattr->ia_valid |= ATTR_MTIME;
2141}
2142
2143static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2144 fmode_t fmode,
2145 int flags,
2146 struct nfs_open_context *ctx)
2147{
2148 struct nfs4_state_owner *sp = opendata->owner;
2149 struct nfs_server *server = sp->so_server;
2150 struct dentry *dentry;
2151 struct nfs4_state *state;
2152 unsigned int seq;
2153 int ret;
2154
2155 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2156
2157 ret = _nfs4_proc_open(opendata);
2158 if (ret != 0)
2159 goto out;
2160
2161 state = nfs4_opendata_to_nfs4_state(opendata);
2162 ret = PTR_ERR(state);
2163 if (IS_ERR(state))
2164 goto out;
2165 if (server->caps & NFS_CAP_POSIX_LOCK)
2166 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2167
2168 dentry = opendata->dentry;
2169 if (dentry->d_inode == NULL) {
2170 /* FIXME: Is this d_drop() ever needed? */
2171 d_drop(dentry);
2172 dentry = d_add_unique(dentry, igrab(state->inode));
2173 if (dentry == NULL) {
2174 dentry = opendata->dentry;
2175 } else if (dentry != ctx->dentry) {
2176 dput(ctx->dentry);
2177 ctx->dentry = dget(dentry);
2178 }
2179 nfs_set_verifier(dentry,
2180 nfs_save_change_attribute(opendata->dir->d_inode));
2181 }
2182
2183 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2184 if (ret != 0)
2185 goto out;
2186
2187 ctx->state = state;
2188 if (dentry->d_inode == state->inode) {
2189 nfs_inode_attach_open_context(ctx);
2190 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2191 nfs4_schedule_stateid_recovery(server, state);
2192 }
2193out:
2194 return ret;
2195}
2196
2197/*
2198 * Returns a referenced nfs4_state
2199 */
2200static int _nfs4_do_open(struct inode *dir,
2201 struct nfs_open_context *ctx,
2202 int flags,
2203 struct iattr *sattr,
2204 struct nfs4_label *label,
2205 int *opened)
2206{
2207 struct nfs4_state_owner *sp;
2208 struct nfs4_state *state = NULL;
2209 struct nfs_server *server = NFS_SERVER(dir);
2210 struct nfs4_opendata *opendata;
2211 struct dentry *dentry = ctx->dentry;
2212 struct rpc_cred *cred = ctx->cred;
2213 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2214 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2215 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2216 struct nfs4_label *olabel = NULL;
2217 int status;
2218
2219 /* Protect against reboot recovery conflicts */
2220 status = -ENOMEM;
2221 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2222 if (sp == NULL) {
2223 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2224 goto out_err;
2225 }
2226 status = nfs4_recover_expired_lease(server);
2227 if (status != 0)
2228 goto err_put_state_owner;
2229 if (dentry->d_inode != NULL)
2230 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2231 status = -ENOMEM;
2232 if (dentry->d_inode)
2233 claim = NFS4_OPEN_CLAIM_FH;
2234 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2235 label, claim, GFP_KERNEL);
2236 if (opendata == NULL)
2237 goto err_put_state_owner;
2238
2239 if (label) {
2240 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2241 if (IS_ERR(olabel)) {
2242 status = PTR_ERR(olabel);
2243 goto err_opendata_put;
2244 }
2245 }
2246
2247 if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2248 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2249 if (!opendata->f_attr.mdsthreshold)
2250 goto err_free_label;
2251 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2252 }
2253 if (dentry->d_inode != NULL)
2254 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2255
2256 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2257 if (status != 0)
2258 goto err_free_label;
2259 state = ctx->state;
2260
2261 if ((opendata->o_arg.open_flags & O_EXCL) &&
2262 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2263 nfs4_exclusive_attrset(opendata, sattr);
2264
2265 nfs_fattr_init(opendata->o_res.f_attr);
2266 status = nfs4_do_setattr(state->inode, cred,
2267 opendata->o_res.f_attr, sattr,
2268 state, label, olabel);
2269 if (status == 0) {
2270 nfs_setattr_update_inode(state->inode, sattr);
2271 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2272 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2273 }
2274 }
2275 if (opendata->file_created)
2276 *opened |= FILE_CREATED;
2277
2278 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2279 *ctx_th = opendata->f_attr.mdsthreshold;
2280 else
2281 kfree(opendata->f_attr.mdsthreshold);
2282 opendata->f_attr.mdsthreshold = NULL;
2283
2284 nfs4_label_free(olabel);
2285
2286 nfs4_opendata_put(opendata);
2287 nfs4_put_state_owner(sp);
2288 return 0;
2289err_free_label:
2290 nfs4_label_free(olabel);
2291err_opendata_put:
2292 kfree(opendata->f_attr.mdsthreshold);
2293 nfs4_opendata_put(opendata);
2294err_put_state_owner:
2295 nfs4_put_state_owner(sp);
2296out_err:
2297 return status;
2298}
2299
2300
2301static struct nfs4_state *nfs4_do_open(struct inode *dir,
2302 struct nfs_open_context *ctx,
2303 int flags,
2304 struct iattr *sattr,
2305 struct nfs4_label *label,
2306 int *opened)
2307{
2308 struct nfs_server *server = NFS_SERVER(dir);
2309 struct nfs4_exception exception = { };
2310 struct nfs4_state *res;
2311 int status;
2312
2313 do {
2314 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2315 res = ctx->state;
2316 trace_nfs4_open_file(ctx, flags, status);
2317 if (status == 0)
2318 break;
2319 /* NOTE: BAD_SEQID means the server and client disagree about the
2320 * book-keeping w.r.t. state-changing operations
2321 * (OPEN/CLOSE/LOCK/LOCKU...)
2322 * It is actually a sign of a bug on the client or on the server.
2323 *
2324 * If we receive a BAD_SEQID error in the particular case of
2325 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2326 * have unhashed the old state_owner for us, and that we can
2327 * therefore safely retry using a new one. We should still warn
2328 * the user though...
2329 */
2330 if (status == -NFS4ERR_BAD_SEQID) {
2331 pr_warn_ratelimited("NFS: v4 server %s "
2332 " returned a bad sequence-id error!\n",
2333 NFS_SERVER(dir)->nfs_client->cl_hostname);
2334 exception.retry = 1;
2335 continue;
2336 }
2337 /*
2338 * BAD_STATEID on OPEN means that the server cancelled our
2339 * state before it received the OPEN_CONFIRM.
2340 * Recover by retrying the request as per the discussion
2341 * on Page 181 of RFC3530.
2342 */
2343 if (status == -NFS4ERR_BAD_STATEID) {
2344 exception.retry = 1;
2345 continue;
2346 }
2347 if (status == -EAGAIN) {
2348 /* We must have found a delegation */
2349 exception.retry = 1;
2350 continue;
2351 }
2352 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2353 continue;
2354 res = ERR_PTR(nfs4_handle_exception(server,
2355 status, &exception));
2356 } while (exception.retry);
2357 return res;
2358}
2359
2360static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2361 struct nfs_fattr *fattr, struct iattr *sattr,
2362 struct nfs4_state *state, struct nfs4_label *ilabel,
2363 struct nfs4_label *olabel)
2364{
2365 struct nfs_server *server = NFS_SERVER(inode);
2366 struct nfs_setattrargs arg = {
2367 .fh = NFS_FH(inode),
2368 .iap = sattr,
2369 .server = server,
2370 .bitmask = server->attr_bitmask,
2371 .label = ilabel,
2372 };
2373 struct nfs_setattrres res = {
2374 .fattr = fattr,
2375 .label = olabel,
2376 .server = server,
2377 };
2378 struct rpc_message msg = {
2379 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2380 .rpc_argp = &arg,
2381 .rpc_resp = &res,
2382 .rpc_cred = cred,
2383 };
2384 unsigned long timestamp = jiffies;
2385 fmode_t fmode;
2386 bool truncate;
2387 int status;
2388
2389 arg.bitmask = nfs4_bitmask(server, ilabel);
2390 if (ilabel)
2391 arg.bitmask = nfs4_bitmask(server, olabel);
2392
2393 nfs_fattr_init(fattr);
2394
2395 /* Servers should only apply open mode checks for file size changes */
2396 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2397 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2398
2399 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2400 /* Use that stateid */
2401 } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2402 struct nfs_lockowner lockowner = {
2403 .l_owner = current->files,
2404 .l_pid = current->tgid,
2405 };
2406 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2407 &lockowner);
2408 } else
2409 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2410
2411 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2412 if (status == 0 && state != NULL)
2413 renew_lease(server, timestamp);
2414 return status;
2415}
2416
2417static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2418 struct nfs_fattr *fattr, struct iattr *sattr,
2419 struct nfs4_state *state, struct nfs4_label *ilabel,
2420 struct nfs4_label *olabel)
2421{
2422 struct nfs_server *server = NFS_SERVER(inode);
2423 struct nfs4_exception exception = {
2424 .state = state,
2425 .inode = inode,
2426 };
2427 int err;
2428 do {
2429 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2430 trace_nfs4_setattr(inode, err);
2431 switch (err) {
2432 case -NFS4ERR_OPENMODE:
2433 if (!(sattr->ia_valid & ATTR_SIZE)) {
2434 pr_warn_once("NFSv4: server %s is incorrectly "
2435 "applying open mode checks to "
2436 "a SETATTR that is not "
2437 "changing file size.\n",
2438 server->nfs_client->cl_hostname);
2439 }
2440 if (state && !(state->state & FMODE_WRITE)) {
2441 err = -EBADF;
2442 if (sattr->ia_valid & ATTR_OPEN)
2443 err = -EACCES;
2444 goto out;
2445 }
2446 }
2447 err = nfs4_handle_exception(server, err, &exception);
2448 } while (exception.retry);
2449out:
2450 return err;
2451}
2452
2453struct nfs4_closedata {
2454 struct inode *inode;
2455 struct nfs4_state *state;
2456 struct nfs_closeargs arg;
2457 struct nfs_closeres res;
2458 struct nfs_fattr fattr;
2459 unsigned long timestamp;
2460 bool roc;
2461 u32 roc_barrier;
2462};
2463
2464static void nfs4_free_closedata(void *data)
2465{
2466 struct nfs4_closedata *calldata = data;
2467 struct nfs4_state_owner *sp = calldata->state->owner;
2468 struct super_block *sb = calldata->state->inode->i_sb;
2469
2470 if (calldata->roc)
2471 pnfs_roc_release(calldata->state->inode);
2472 nfs4_put_open_state(calldata->state);
2473 nfs_free_seqid(calldata->arg.seqid);
2474 nfs4_put_state_owner(sp);
2475 nfs_sb_deactive(sb);
2476 kfree(calldata);
2477}
2478
2479static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2480 fmode_t fmode)
2481{
2482 spin_lock(&state->owner->so_lock);
2483 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2484 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2485 case FMODE_WRITE:
2486 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2487 break;
2488 case FMODE_READ:
2489 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2490 break;
2491 case 0:
2492 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2493 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2494 clear_bit(NFS_OPEN_STATE, &state->flags);
2495 }
2496 spin_unlock(&state->owner->so_lock);
2497}
2498
2499static void nfs4_close_done(struct rpc_task *task, void *data)
2500{
2501 struct nfs4_closedata *calldata = data;
2502 struct nfs4_state *state = calldata->state;
2503 struct nfs_server *server = NFS_SERVER(calldata->inode);
2504
2505 dprintk("%s: begin!\n", __func__);
2506 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2507 return;
2508 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2509 /* hmm. we are done with the inode, and in the process of freeing
2510 * the state_owner. we keep this around to process errors
2511 */
2512 switch (task->tk_status) {
2513 case 0:
2514 if (calldata->roc)
2515 pnfs_roc_set_barrier(state->inode,
2516 calldata->roc_barrier);
2517 nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2518 renew_lease(server, calldata->timestamp);
2519 break;
2520 case -NFS4ERR_ADMIN_REVOKED:
2521 case -NFS4ERR_STALE_STATEID:
2522 case -NFS4ERR_OLD_STATEID:
2523 case -NFS4ERR_BAD_STATEID:
2524 case -NFS4ERR_EXPIRED:
2525 if (calldata->arg.fmode == 0)
2526 break;
2527 default:
2528 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2529 rpc_restart_call_prepare(task);
2530 goto out_release;
2531 }
2532 }
2533 nfs4_close_clear_stateid_flags(state, calldata->arg.fmode);
2534out_release:
2535 nfs_release_seqid(calldata->arg.seqid);
2536 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2537 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2538}
2539
2540static void nfs4_close_prepare(struct rpc_task *task, void *data)
2541{
2542 struct nfs4_closedata *calldata = data;
2543 struct nfs4_state *state = calldata->state;
2544 struct inode *inode = calldata->inode;
2545 int call_close = 0;
2546
2547 dprintk("%s: begin!\n", __func__);
2548 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2549 goto out_wait;
2550
2551 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2552 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2553 spin_lock(&state->owner->so_lock);
2554 /* Calculate the change in open mode */
2555 if (state->n_rdwr == 0) {
2556 if (state->n_rdonly == 0) {
2557 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2558 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2559 calldata->arg.fmode &= ~FMODE_READ;
2560 }
2561 if (state->n_wronly == 0) {
2562 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2563 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2564 calldata->arg.fmode &= ~FMODE_WRITE;
2565 }
2566 }
2567 if (!nfs4_valid_open_stateid(state))
2568 call_close = 0;
2569 spin_unlock(&state->owner->so_lock);
2570
2571 if (!call_close) {
2572 /* Note: exit _without_ calling nfs4_close_done */
2573 goto out_no_action;
2574 }
2575
2576 if (calldata->arg.fmode == 0) {
2577 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2578 if (calldata->roc &&
2579 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2580 nfs_release_seqid(calldata->arg.seqid);
2581 goto out_wait;
2582 }
2583 }
2584
2585 nfs_fattr_init(calldata->res.fattr);
2586 calldata->timestamp = jiffies;
2587 if (nfs4_setup_sequence(NFS_SERVER(inode),
2588 &calldata->arg.seq_args,
2589 &calldata->res.seq_res,
2590 task) != 0)
2591 nfs_release_seqid(calldata->arg.seqid);
2592 dprintk("%s: done!\n", __func__);
2593 return;
2594out_no_action:
2595 task->tk_action = NULL;
2596out_wait:
2597 nfs4_sequence_done(task, &calldata->res.seq_res);
2598}
2599
2600static const struct rpc_call_ops nfs4_close_ops = {
2601 .rpc_call_prepare = nfs4_close_prepare,
2602 .rpc_call_done = nfs4_close_done,
2603 .rpc_release = nfs4_free_closedata,
2604};
2605
2606/*
2607 * It is possible for data to be read/written from a mem-mapped file
2608 * after the sys_close call (which hits the vfs layer as a flush).
2609 * This means that we can't safely call nfsv4 close on a file until
2610 * the inode is cleared. This in turn means that we are not good
2611 * NFSv4 citizens - we do not indicate to the server to update the file's
2612 * share state even when we are done with one of the three share
2613 * stateid's in the inode.
2614 *
2615 * NOTE: Caller must be holding the sp->so_owner semaphore!
2616 */
2617int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2618{
2619 struct nfs_server *server = NFS_SERVER(state->inode);
2620 struct nfs4_closedata *calldata;
2621 struct nfs4_state_owner *sp = state->owner;
2622 struct rpc_task *task;
2623 struct rpc_message msg = {
2624 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2625 .rpc_cred = state->owner->so_cred,
2626 };
2627 struct rpc_task_setup task_setup_data = {
2628 .rpc_client = server->client,
2629 .rpc_message = &msg,
2630 .callback_ops = &nfs4_close_ops,
2631 .workqueue = nfsiod_workqueue,
2632 .flags = RPC_TASK_ASYNC,
2633 };
2634 int status = -ENOMEM;
2635
2636 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2637 &task_setup_data.rpc_client, &msg);
2638
2639 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2640 if (calldata == NULL)
2641 goto out;
2642 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2643 calldata->inode = state->inode;
2644 calldata->state = state;
2645 calldata->arg.fh = NFS_FH(state->inode);
2646 calldata->arg.stateid = &state->open_stateid;
2647 /* Serialization for the sequence id */
2648 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2649 if (calldata->arg.seqid == NULL)
2650 goto out_free_calldata;
2651 calldata->arg.fmode = 0;
2652 calldata->arg.bitmask = server->cache_consistency_bitmask;
2653 calldata->res.fattr = &calldata->fattr;
2654 calldata->res.seqid = calldata->arg.seqid;
2655 calldata->res.server = server;
2656 calldata->roc = pnfs_roc(state->inode);
2657 nfs_sb_active(calldata->inode->i_sb);
2658
2659 msg.rpc_argp = &calldata->arg;
2660 msg.rpc_resp = &calldata->res;
2661 task_setup_data.callback_data = calldata;
2662 task = rpc_run_task(&task_setup_data);
2663 if (IS_ERR(task))
2664 return PTR_ERR(task);
2665 status = 0;
2666 if (wait)
2667 status = rpc_wait_for_completion_task(task);
2668 rpc_put_task(task);
2669 return status;
2670out_free_calldata:
2671 kfree(calldata);
2672out:
2673 nfs4_put_open_state(state);
2674 nfs4_put_state_owner(sp);
2675 return status;
2676}
2677
2678static struct inode *
2679nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2680 int open_flags, struct iattr *attr, int *opened)
2681{
2682 struct nfs4_state *state;
2683 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2684
2685 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2686
2687 /* Protect against concurrent sillydeletes */
2688 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2689
2690 nfs4_label_release_security(label);
2691
2692 if (IS_ERR(state))
2693 return ERR_CAST(state);
2694 return state->inode;
2695}
2696
2697static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2698{
2699 if (ctx->state == NULL)
2700 return;
2701 if (is_sync)
2702 nfs4_close_sync(ctx->state, ctx->mode);
2703 else
2704 nfs4_close_state(ctx->state, ctx->mode);
2705}
2706
2707#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2708#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2709#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL)
2710
2711static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2712{
2713 struct nfs4_server_caps_arg args = {
2714 .fhandle = fhandle,
2715 };
2716 struct nfs4_server_caps_res res = {};
2717 struct rpc_message msg = {
2718 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2719 .rpc_argp = &args,
2720 .rpc_resp = &res,
2721 };
2722 int status;
2723
2724 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2725 if (status == 0) {
2726 /* Sanity check the server answers */
2727 switch (server->nfs_client->cl_minorversion) {
2728 case 0:
2729 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2730 res.attr_bitmask[2] = 0;
2731 break;
2732 case 1:
2733 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2734 break;
2735 case 2:
2736 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2737 }
2738 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2739 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2740 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2741 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2742 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2743 NFS_CAP_CTIME|NFS_CAP_MTIME|
2744 NFS_CAP_SECURITY_LABEL);
2745 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2746 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2747 server->caps |= NFS_CAP_ACLS;
2748 if (res.has_links != 0)
2749 server->caps |= NFS_CAP_HARDLINKS;
2750 if (res.has_symlinks != 0)
2751 server->caps |= NFS_CAP_SYMLINKS;
2752 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2753 server->caps |= NFS_CAP_FILEID;
2754 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2755 server->caps |= NFS_CAP_MODE;
2756 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2757 server->caps |= NFS_CAP_NLINK;
2758 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2759 server->caps |= NFS_CAP_OWNER;
2760 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2761 server->caps |= NFS_CAP_OWNER_GROUP;
2762 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2763 server->caps |= NFS_CAP_ATIME;
2764 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2765 server->caps |= NFS_CAP_CTIME;
2766 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2767 server->caps |= NFS_CAP_MTIME;
2768#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2769 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2770 server->caps |= NFS_CAP_SECURITY_LABEL;
2771#endif
2772 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2773 sizeof(server->attr_bitmask));
2774 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2775
2776 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2777 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2778 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2779 server->cache_consistency_bitmask[2] = 0;
2780 server->acl_bitmask = res.acl_bitmask;
2781 server->fh_expire_type = res.fh_expire_type;
2782 }
2783
2784 return status;
2785}
2786
2787int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2788{
2789 struct nfs4_exception exception = { };
2790 int err;
2791 do {
2792 err = nfs4_handle_exception(server,
2793 _nfs4_server_capabilities(server, fhandle),
2794 &exception);
2795 } while (exception.retry);
2796 return err;
2797}
2798
2799static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2800 struct nfs_fsinfo *info)
2801{
2802 u32 bitmask[3];
2803 struct nfs4_lookup_root_arg args = {
2804 .bitmask = bitmask,
2805 };
2806 struct nfs4_lookup_res res = {
2807 .server = server,
2808 .fattr = info->fattr,
2809 .fh = fhandle,
2810 };
2811 struct rpc_message msg = {
2812 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2813 .rpc_argp = &args,
2814 .rpc_resp = &res,
2815 };
2816
2817 bitmask[0] = nfs4_fattr_bitmap[0];
2818 bitmask[1] = nfs4_fattr_bitmap[1];
2819 /*
2820 * Process the label in the upcoming getfattr
2821 */
2822 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2823
2824 nfs_fattr_init(info->fattr);
2825 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2826}
2827
2828static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2829 struct nfs_fsinfo *info)
2830{
2831 struct nfs4_exception exception = { };
2832 int err;
2833 do {
2834 err = _nfs4_lookup_root(server, fhandle, info);
2835 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2836 switch (err) {
2837 case 0:
2838 case -NFS4ERR_WRONGSEC:
2839 goto out;
2840 default:
2841 err = nfs4_handle_exception(server, err, &exception);
2842 }
2843 } while (exception.retry);
2844out:
2845 return err;
2846}
2847
2848static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2849 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2850{
2851 struct rpc_auth_create_args auth_args = {
2852 .pseudoflavor = flavor,
2853 };
2854 struct rpc_auth *auth;
2855 int ret;
2856
2857 auth = rpcauth_create(&auth_args, server->client);
2858 if (IS_ERR(auth)) {
2859 ret = -EACCES;
2860 goto out;
2861 }
2862 ret = nfs4_lookup_root(server, fhandle, info);
2863out:
2864 return ret;
2865}
2866
2867/*
2868 * Retry pseudoroot lookup with various security flavors. We do this when:
2869 *
2870 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2871 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2872 *
2873 * Returns zero on success, or a negative NFS4ERR value, or a
2874 * negative errno value.
2875 */
2876static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2877 struct nfs_fsinfo *info)
2878{
2879 /* Per 3530bis 15.33.5 */
2880 static const rpc_authflavor_t flav_array[] = {
2881 RPC_AUTH_GSS_KRB5P,
2882 RPC_AUTH_GSS_KRB5I,
2883 RPC_AUTH_GSS_KRB5,
2884 RPC_AUTH_UNIX, /* courtesy */
2885 RPC_AUTH_NULL,
2886 };
2887 int status = -EPERM;
2888 size_t i;
2889
2890 if (server->auth_info.flavor_len > 0) {
2891 /* try each flavor specified by user */
2892 for (i = 0; i < server->auth_info.flavor_len; i++) {
2893 status = nfs4_lookup_root_sec(server, fhandle, info,
2894 server->auth_info.flavors[i]);
2895 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2896 continue;
2897 break;
2898 }
2899 } else {
2900 /* no flavors specified by user, try default list */
2901 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2902 status = nfs4_lookup_root_sec(server, fhandle, info,
2903 flav_array[i]);
2904 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2905 continue;
2906 break;
2907 }
2908 }
2909
2910 /*
2911 * -EACCESS could mean that the user doesn't have correct permissions
2912 * to access the mount. It could also mean that we tried to mount
2913 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2914 * existing mount programs don't handle -EACCES very well so it should
2915 * be mapped to -EPERM instead.
2916 */
2917 if (status == -EACCES)
2918 status = -EPERM;
2919 return status;
2920}
2921
2922static int nfs4_do_find_root_sec(struct nfs_server *server,
2923 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2924{
2925 int mv = server->nfs_client->cl_minorversion;
2926 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2927}
2928
2929/**
2930 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2931 * @server: initialized nfs_server handle
2932 * @fhandle: we fill in the pseudo-fs root file handle
2933 * @info: we fill in an FSINFO struct
2934 * @auth_probe: probe the auth flavours
2935 *
2936 * Returns zero on success, or a negative errno.
2937 */
2938int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2939 struct nfs_fsinfo *info,
2940 bool auth_probe)
2941{
2942 int status;
2943
2944 switch (auth_probe) {
2945 case false:
2946 status = nfs4_lookup_root(server, fhandle, info);
2947 if (status != -NFS4ERR_WRONGSEC)
2948 break;
2949 default:
2950 status = nfs4_do_find_root_sec(server, fhandle, info);
2951 }
2952
2953 if (status == 0)
2954 status = nfs4_server_capabilities(server, fhandle);
2955 if (status == 0)
2956 status = nfs4_do_fsinfo(server, fhandle, info);
2957
2958 return nfs4_map_errors(status);
2959}
2960
2961static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2962 struct nfs_fsinfo *info)
2963{
2964 int error;
2965 struct nfs_fattr *fattr = info->fattr;
2966 struct nfs4_label *label = NULL;
2967
2968 error = nfs4_server_capabilities(server, mntfh);
2969 if (error < 0) {
2970 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2971 return error;
2972 }
2973
2974 label = nfs4_label_alloc(server, GFP_KERNEL);
2975 if (IS_ERR(label))
2976 return PTR_ERR(label);
2977
2978 error = nfs4_proc_getattr(server, mntfh, fattr, label);
2979 if (error < 0) {
2980 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2981 goto err_free_label;
2982 }
2983
2984 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2985 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2986 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2987
2988err_free_label:
2989 nfs4_label_free(label);
2990
2991 return error;
2992}
2993
2994/*
2995 * Get locations and (maybe) other attributes of a referral.
2996 * Note that we'll actually follow the referral later when
2997 * we detect fsid mismatch in inode revalidation
2998 */
2999static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3000 const struct qstr *name, struct nfs_fattr *fattr,
3001 struct nfs_fh *fhandle)
3002{
3003 int status = -ENOMEM;
3004 struct page *page = NULL;
3005 struct nfs4_fs_locations *locations = NULL;
3006
3007 page = alloc_page(GFP_KERNEL);
3008 if (page == NULL)
3009 goto out;
3010 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3011 if (locations == NULL)
3012 goto out;
3013
3014 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3015 if (status != 0)
3016 goto out;
3017
3018 /*
3019 * If the fsid didn't change, this is a migration event, not a
3020 * referral. Cause us to drop into the exception handler, which
3021 * will kick off migration recovery.
3022 */
3023 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3024 dprintk("%s: server did not return a different fsid for"
3025 " a referral at %s\n", __func__, name->name);
3026 status = -NFS4ERR_MOVED;
3027 goto out;
3028 }
3029 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3030 nfs_fixup_referral_attributes(&locations->fattr);
3031
3032 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3033 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3034 memset(fhandle, 0, sizeof(struct nfs_fh));
3035out:
3036 if (page)
3037 __free_page(page);
3038 kfree(locations);
3039 return status;
3040}
3041
3042static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3043 struct nfs_fattr *fattr, struct nfs4_label *label)
3044{
3045 struct nfs4_getattr_arg args = {
3046 .fh = fhandle,
3047 .bitmask = server->attr_bitmask,
3048 };
3049 struct nfs4_getattr_res res = {
3050 .fattr = fattr,
3051 .label = label,
3052 .server = server,
3053 };
3054 struct rpc_message msg = {
3055 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3056 .rpc_argp = &args,
3057 .rpc_resp = &res,
3058 };
3059
3060 args.bitmask = nfs4_bitmask(server, label);
3061
3062 nfs_fattr_init(fattr);
3063 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3064}
3065
3066static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3067 struct nfs_fattr *fattr, struct nfs4_label *label)
3068{
3069 struct nfs4_exception exception = { };
3070 int err;
3071 do {
3072 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3073 trace_nfs4_getattr(server, fhandle, fattr, err);
3074 err = nfs4_handle_exception(server, err,
3075 &exception);
3076 } while (exception.retry);
3077 return err;
3078}
3079
3080/*
3081 * The file is not closed if it is opened due to the a request to change
3082 * the size of the file. The open call will not be needed once the
3083 * VFS layer lookup-intents are implemented.
3084 *
3085 * Close is called when the inode is destroyed.
3086 * If we haven't opened the file for O_WRONLY, we
3087 * need to in the size_change case to obtain a stateid.
3088 *
3089 * Got race?
3090 * Because OPEN is always done by name in nfsv4, it is
3091 * possible that we opened a different file by the same
3092 * name. We can recognize this race condition, but we
3093 * can't do anything about it besides returning an error.
3094 *
3095 * This will be fixed with VFS changes (lookup-intent).
3096 */
3097static int
3098nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3099 struct iattr *sattr)
3100{
3101 struct inode *inode = dentry->d_inode;
3102 struct rpc_cred *cred = NULL;
3103 struct nfs4_state *state = NULL;
3104 struct nfs4_label *label = NULL;
3105 int status;
3106
3107 if (pnfs_ld_layoutret_on_setattr(inode))
3108 pnfs_commit_and_return_layout(inode);
3109
3110 nfs_fattr_init(fattr);
3111
3112 /* Deal with open(O_TRUNC) */
3113 if (sattr->ia_valid & ATTR_OPEN)
3114 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3115
3116 /* Optimization: if the end result is no change, don't RPC */
3117 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3118 return 0;
3119
3120 /* Search for an existing open(O_WRITE) file */
3121 if (sattr->ia_valid & ATTR_FILE) {
3122 struct nfs_open_context *ctx;
3123
3124 ctx = nfs_file_open_context(sattr->ia_file);
3125 if (ctx) {
3126 cred = ctx->cred;
3127 state = ctx->state;
3128 }
3129 }
3130
3131 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3132 if (IS_ERR(label))
3133 return PTR_ERR(label);
3134
3135 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3136 if (status == 0) {
3137 nfs_setattr_update_inode(inode, sattr);
3138 nfs_setsecurity(inode, fattr, label);
3139 }
3140 nfs4_label_free(label);
3141 return status;
3142}
3143
3144static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3145 const struct qstr *name, struct nfs_fh *fhandle,
3146 struct nfs_fattr *fattr, struct nfs4_label *label)
3147{
3148 struct nfs_server *server = NFS_SERVER(dir);
3149 int status;
3150 struct nfs4_lookup_arg args = {
3151 .bitmask = server->attr_bitmask,
3152 .dir_fh = NFS_FH(dir),
3153 .name = name,
3154 };
3155 struct nfs4_lookup_res res = {
3156 .server = server,
3157 .fattr = fattr,
3158 .label = label,
3159 .fh = fhandle,
3160 };
3161 struct rpc_message msg = {
3162 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3163 .rpc_argp = &args,
3164 .rpc_resp = &res,
3165 };
3166
3167 args.bitmask = nfs4_bitmask(server, label);
3168
3169 nfs_fattr_init(fattr);
3170
3171 dprintk("NFS call lookup %s\n", name->name);
3172 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3173 dprintk("NFS reply lookup: %d\n", status);
3174 return status;
3175}
3176
3177static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3178{
3179 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3180 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3181 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3182 fattr->nlink = 2;
3183}
3184
3185static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3186 struct qstr *name, struct nfs_fh *fhandle,
3187 struct nfs_fattr *fattr, struct nfs4_label *label)
3188{
3189 struct nfs4_exception exception = { };
3190 struct rpc_clnt *client = *clnt;
3191 int err;
3192 do {
3193 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3194 trace_nfs4_lookup(dir, name, err);
3195 switch (err) {
3196 case -NFS4ERR_BADNAME:
3197 err = -ENOENT;
3198 goto out;
3199 case -NFS4ERR_MOVED:
3200 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3201 goto out;
3202 case -NFS4ERR_WRONGSEC:
3203 err = -EPERM;
3204 if (client != *clnt)
3205 goto out;
3206 client = nfs4_create_sec_client(client, dir, name);
3207 if (IS_ERR(client))
3208 return PTR_ERR(client);
3209
3210 exception.retry = 1;
3211 break;
3212 default:
3213 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3214 }
3215 } while (exception.retry);
3216
3217out:
3218 if (err == 0)
3219 *clnt = client;
3220 else if (client != *clnt)
3221 rpc_shutdown_client(client);
3222
3223 return err;
3224}
3225
3226static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3227 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3228 struct nfs4_label *label)
3229{
3230 int status;
3231 struct rpc_clnt *client = NFS_CLIENT(dir);
3232
3233 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3234 if (client != NFS_CLIENT(dir)) {
3235 rpc_shutdown_client(client);
3236 nfs_fixup_secinfo_attributes(fattr);
3237 }
3238 return status;
3239}
3240
3241struct rpc_clnt *
3242nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3243 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3244{
3245 struct rpc_clnt *client = NFS_CLIENT(dir);
3246 int status;
3247
3248 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3249 if (status < 0)
3250 return ERR_PTR(status);
3251 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3252}
3253
3254static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3255{
3256 struct nfs_server *server = NFS_SERVER(inode);
3257 struct nfs4_accessargs args = {
3258 .fh = NFS_FH(inode),
3259 .bitmask = server->cache_consistency_bitmask,
3260 };
3261 struct nfs4_accessres res = {
3262 .server = server,
3263 };
3264 struct rpc_message msg = {
3265 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3266 .rpc_argp = &args,
3267 .rpc_resp = &res,
3268 .rpc_cred = entry->cred,
3269 };
3270 int mode = entry->mask;
3271 int status = 0;
3272
3273 /*
3274 * Determine which access bits we want to ask for...
3275 */
3276 if (mode & MAY_READ)
3277 args.access |= NFS4_ACCESS_READ;
3278 if (S_ISDIR(inode->i_mode)) {
3279 if (mode & MAY_WRITE)
3280 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3281 if (mode & MAY_EXEC)
3282 args.access |= NFS4_ACCESS_LOOKUP;
3283 } else {
3284 if (mode & MAY_WRITE)
3285 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3286 if (mode & MAY_EXEC)
3287 args.access |= NFS4_ACCESS_EXECUTE;
3288 }
3289
3290 res.fattr = nfs_alloc_fattr();
3291 if (res.fattr == NULL)
3292 return -ENOMEM;
3293
3294 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3295 if (!status) {
3296 nfs_access_set_mask(entry, res.access);
3297 nfs_refresh_inode(inode, res.fattr);
3298 }
3299 nfs_free_fattr(res.fattr);
3300 return status;
3301}
3302
3303static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3304{
3305 struct nfs4_exception exception = { };
3306 int err;
3307 do {
3308 err = _nfs4_proc_access(inode, entry);
3309 trace_nfs4_access(inode, err);
3310 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3311 &exception);
3312 } while (exception.retry);
3313 return err;
3314}
3315
3316/*
3317 * TODO: For the time being, we don't try to get any attributes
3318 * along with any of the zero-copy operations READ, READDIR,
3319 * READLINK, WRITE.
3320 *
3321 * In the case of the first three, we want to put the GETATTR
3322 * after the read-type operation -- this is because it is hard
3323 * to predict the length of a GETATTR response in v4, and thus
3324 * align the READ data correctly. This means that the GETATTR
3325 * may end up partially falling into the page cache, and we should
3326 * shift it into the 'tail' of the xdr_buf before processing.
3327 * To do this efficiently, we need to know the total length
3328 * of data received, which doesn't seem to be available outside
3329 * of the RPC layer.
3330 *
3331 * In the case of WRITE, we also want to put the GETATTR after
3332 * the operation -- in this case because we want to make sure
3333 * we get the post-operation mtime and size.
3334 *
3335 * Both of these changes to the XDR layer would in fact be quite
3336 * minor, but I decided to leave them for a subsequent patch.
3337 */
3338static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3339 unsigned int pgbase, unsigned int pglen)
3340{
3341 struct nfs4_readlink args = {
3342 .fh = NFS_FH(inode),
3343 .pgbase = pgbase,
3344 .pglen = pglen,
3345 .pages = &page,
3346 };
3347 struct nfs4_readlink_res res;
3348 struct rpc_message msg = {
3349 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3350 .rpc_argp = &args,
3351 .rpc_resp = &res,
3352 };
3353
3354 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3355}
3356
3357static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3358 unsigned int pgbase, unsigned int pglen)
3359{
3360 struct nfs4_exception exception = { };
3361 int err;
3362 do {
3363 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3364 trace_nfs4_readlink(inode, err);
3365 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3366 &exception);
3367 } while (exception.retry);
3368 return err;
3369}
3370
3371/*
3372 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3373 */
3374static int
3375nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3376 int flags)
3377{
3378 struct nfs4_label l, *ilabel = NULL;
3379 struct nfs_open_context *ctx;
3380 struct nfs4_state *state;
3381 int opened = 0;
3382 int status = 0;
3383
3384 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3385 if (IS_ERR(ctx))
3386 return PTR_ERR(ctx);
3387
3388 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3389
3390 sattr->ia_mode &= ~current_umask();
3391 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3392 if (IS_ERR(state)) {
3393 status = PTR_ERR(state);
3394 goto out;
3395 }
3396out:
3397 nfs4_label_release_security(ilabel);
3398 put_nfs_open_context(ctx);
3399 return status;
3400}
3401
3402static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3403{
3404 struct nfs_server *server = NFS_SERVER(dir);
3405 struct nfs_removeargs args = {
3406 .fh = NFS_FH(dir),
3407 .name = *name,
3408 };
3409 struct nfs_removeres res = {
3410 .server = server,
3411 };
3412 struct rpc_message msg = {
3413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3414 .rpc_argp = &args,
3415 .rpc_resp = &res,
3416 };
3417 int status;
3418
3419 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3420 if (status == 0)
3421 update_changeattr(dir, &res.cinfo);
3422 return status;
3423}
3424
3425static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3426{
3427 struct nfs4_exception exception = { };
3428 int err;
3429 do {
3430 err = _nfs4_proc_remove(dir, name);
3431 trace_nfs4_remove(dir, name, err);
3432 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3433 &exception);
3434 } while (exception.retry);
3435 return err;
3436}
3437
3438static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3439{
3440 struct nfs_server *server = NFS_SERVER(dir);
3441 struct nfs_removeargs *args = msg->rpc_argp;
3442 struct nfs_removeres *res = msg->rpc_resp;
3443
3444 res->server = server;
3445 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3446 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3447
3448 nfs_fattr_init(res->dir_attr);
3449}
3450
3451static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3452{
3453 nfs4_setup_sequence(NFS_SERVER(data->dir),
3454 &data->args.seq_args,
3455 &data->res.seq_res,
3456 task);
3457}
3458
3459static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3460{
3461 struct nfs_unlinkdata *data = task->tk_calldata;
3462 struct nfs_removeres *res = &data->res;
3463
3464 if (!nfs4_sequence_done(task, &res->seq_res))
3465 return 0;
3466 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3467 return 0;
3468 update_changeattr(dir, &res->cinfo);
3469 return 1;
3470}
3471
3472static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3473{
3474 struct nfs_server *server = NFS_SERVER(dir);
3475 struct nfs_renameargs *arg = msg->rpc_argp;
3476 struct nfs_renameres *res = msg->rpc_resp;
3477
3478 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3479 res->server = server;
3480 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3481}
3482
3483static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3484{
3485 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3486 &data->args.seq_args,
3487 &data->res.seq_res,
3488 task);
3489}
3490
3491static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3492 struct inode *new_dir)
3493{
3494 struct nfs_renamedata *data = task->tk_calldata;
3495 struct nfs_renameres *res = &data->res;
3496
3497 if (!nfs4_sequence_done(task, &res->seq_res))
3498 return 0;
3499 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3500 return 0;
3501
3502 update_changeattr(old_dir, &res->old_cinfo);
3503 update_changeattr(new_dir, &res->new_cinfo);
3504 return 1;
3505}
3506
3507static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3508 struct inode *new_dir, struct qstr *new_name)
3509{
3510 struct nfs_server *server = NFS_SERVER(old_dir);
3511 struct nfs_renameargs arg = {
3512 .old_dir = NFS_FH(old_dir),
3513 .new_dir = NFS_FH(new_dir),
3514 .old_name = old_name,
3515 .new_name = new_name,
3516 };
3517 struct nfs_renameres res = {
3518 .server = server,
3519 };
3520 struct rpc_message msg = {
3521 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3522 .rpc_argp = &arg,
3523 .rpc_resp = &res,
3524 };
3525 int status = -ENOMEM;
3526
3527 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3528 if (!status) {
3529 update_changeattr(old_dir, &res.old_cinfo);
3530 update_changeattr(new_dir, &res.new_cinfo);
3531 }
3532 return status;
3533}
3534
3535static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3536 struct inode *new_dir, struct qstr *new_name)
3537{
3538 struct nfs4_exception exception = { };
3539 int err;
3540 do {
3541 err = _nfs4_proc_rename(old_dir, old_name,
3542 new_dir, new_name);
3543 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3544 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3545 &exception);
3546 } while (exception.retry);
3547 return err;
3548}
3549
3550static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3551{
3552 struct nfs_server *server = NFS_SERVER(inode);
3553 struct nfs4_link_arg arg = {
3554 .fh = NFS_FH(inode),
3555 .dir_fh = NFS_FH(dir),
3556 .name = name,
3557 .bitmask = server->attr_bitmask,
3558 };
3559 struct nfs4_link_res res = {
3560 .server = server,
3561 .label = NULL,
3562 };
3563 struct rpc_message msg = {
3564 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3565 .rpc_argp = &arg,
3566 .rpc_resp = &res,
3567 };
3568 int status = -ENOMEM;
3569
3570 res.fattr = nfs_alloc_fattr();
3571 if (res.fattr == NULL)
3572 goto out;
3573
3574 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3575 if (IS_ERR(res.label)) {
3576 status = PTR_ERR(res.label);
3577 goto out;
3578 }
3579 arg.bitmask = nfs4_bitmask(server, res.label);
3580
3581 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3582 if (!status) {
3583 update_changeattr(dir, &res.cinfo);
3584 status = nfs_post_op_update_inode(inode, res.fattr);
3585 if (!status)
3586 nfs_setsecurity(inode, res.fattr, res.label);
3587 }
3588
3589
3590 nfs4_label_free(res.label);
3591
3592out:
3593 nfs_free_fattr(res.fattr);
3594 return status;
3595}
3596
3597static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3598{
3599 struct nfs4_exception exception = { };
3600 int err;
3601 do {
3602 err = nfs4_handle_exception(NFS_SERVER(inode),
3603 _nfs4_proc_link(inode, dir, name),
3604 &exception);
3605 } while (exception.retry);
3606 return err;
3607}
3608
3609struct nfs4_createdata {
3610 struct rpc_message msg;
3611 struct nfs4_create_arg arg;
3612 struct nfs4_create_res res;
3613 struct nfs_fh fh;
3614 struct nfs_fattr fattr;
3615 struct nfs4_label *label;
3616};
3617
3618static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3619 struct qstr *name, struct iattr *sattr, u32 ftype)
3620{
3621 struct nfs4_createdata *data;
3622
3623 data = kzalloc(sizeof(*data), GFP_KERNEL);
3624 if (data != NULL) {
3625 struct nfs_server *server = NFS_SERVER(dir);
3626
3627 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3628 if (IS_ERR(data->label))
3629 goto out_free;
3630
3631 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3632 data->msg.rpc_argp = &data->arg;
3633 data->msg.rpc_resp = &data->res;
3634 data->arg.dir_fh = NFS_FH(dir);
3635 data->arg.server = server;
3636 data->arg.name = name;
3637 data->arg.attrs = sattr;
3638 data->arg.ftype = ftype;
3639 data->arg.bitmask = nfs4_bitmask(server, data->label);
3640 data->res.server = server;
3641 data->res.fh = &data->fh;
3642 data->res.fattr = &data->fattr;
3643 data->res.label = data->label;
3644 nfs_fattr_init(data->res.fattr);
3645 }
3646 return data;
3647out_free:
3648 kfree(data);
3649 return NULL;
3650}
3651
3652static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3653{
3654 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3655 &data->arg.seq_args, &data->res.seq_res, 1);
3656 if (status == 0) {
3657 update_changeattr(dir, &data->res.dir_cinfo);
3658 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3659 }
3660 return status;
3661}
3662
3663static void nfs4_free_createdata(struct nfs4_createdata *data)
3664{
3665 nfs4_label_free(data->label);
3666 kfree(data);
3667}
3668
3669static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3670 struct page *page, unsigned int len, struct iattr *sattr,
3671 struct nfs4_label *label)
3672{
3673 struct nfs4_createdata *data;
3674 int status = -ENAMETOOLONG;
3675
3676 if (len > NFS4_MAXPATHLEN)
3677 goto out;
3678
3679 status = -ENOMEM;
3680 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3681 if (data == NULL)
3682 goto out;
3683
3684 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3685 data->arg.u.symlink.pages = &page;
3686 data->arg.u.symlink.len = len;
3687 data->arg.label = label;
3688
3689 status = nfs4_do_create(dir, dentry, data);
3690
3691 nfs4_free_createdata(data);
3692out:
3693 return status;
3694}
3695
3696static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3697 struct page *page, unsigned int len, struct iattr *sattr)
3698{
3699 struct nfs4_exception exception = { };
3700 struct nfs4_label l, *label = NULL;
3701 int err;
3702
3703 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3704
3705 do {
3706 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3707 trace_nfs4_symlink(dir, &dentry->d_name, err);
3708 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3709 &exception);
3710 } while (exception.retry);
3711
3712 nfs4_label_release_security(label);
3713 return err;
3714}
3715
3716static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3717 struct iattr *sattr, struct nfs4_label *label)
3718{
3719 struct nfs4_createdata *data;
3720 int status = -ENOMEM;
3721
3722 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3723 if (data == NULL)
3724 goto out;
3725
3726 data->arg.label = label;
3727 status = nfs4_do_create(dir, dentry, data);
3728
3729 nfs4_free_createdata(data);
3730out:
3731 return status;
3732}
3733
3734static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3735 struct iattr *sattr)
3736{
3737 struct nfs4_exception exception = { };
3738 struct nfs4_label l, *label = NULL;
3739 int err;
3740
3741 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3742
3743 sattr->ia_mode &= ~current_umask();
3744 do {
3745 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3746 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3747 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3748 &exception);
3749 } while (exception.retry);
3750 nfs4_label_release_security(label);
3751
3752 return err;
3753}
3754
3755static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3756 u64 cookie, struct page **pages, unsigned int count, int plus)
3757{
3758 struct inode *dir = dentry->d_inode;
3759 struct nfs4_readdir_arg args = {
3760 .fh = NFS_FH(dir),
3761 .pages = pages,
3762 .pgbase = 0,
3763 .count = count,
3764 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3765 .plus = plus,
3766 };
3767 struct nfs4_readdir_res res;
3768 struct rpc_message msg = {
3769 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3770 .rpc_argp = &args,
3771 .rpc_resp = &res,
3772 .rpc_cred = cred,
3773 };
3774 int status;
3775
3776 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3777 dentry,
3778 (unsigned long long)cookie);
3779 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3780 res.pgbase = args.pgbase;
3781 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3782 if (status >= 0) {
3783 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3784 status += args.pgbase;
3785 }
3786
3787 nfs_invalidate_atime(dir);
3788
3789 dprintk("%s: returns %d\n", __func__, status);
3790 return status;
3791}
3792
3793static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3794 u64 cookie, struct page **pages, unsigned int count, int plus)
3795{
3796 struct nfs4_exception exception = { };
3797 int err;
3798 do {
3799 err = _nfs4_proc_readdir(dentry, cred, cookie,
3800 pages, count, plus);
3801 trace_nfs4_readdir(dentry->d_inode, err);
3802 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3803 &exception);
3804 } while (exception.retry);
3805 return err;
3806}
3807
3808static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3809 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3810{
3811 struct nfs4_createdata *data;
3812 int mode = sattr->ia_mode;
3813 int status = -ENOMEM;
3814
3815 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3816 if (data == NULL)
3817 goto out;
3818
3819 if (S_ISFIFO(mode))
3820 data->arg.ftype = NF4FIFO;
3821 else if (S_ISBLK(mode)) {
3822 data->arg.ftype = NF4BLK;
3823 data->arg.u.device.specdata1 = MAJOR(rdev);
3824 data->arg.u.device.specdata2 = MINOR(rdev);
3825 }
3826 else if (S_ISCHR(mode)) {
3827 data->arg.ftype = NF4CHR;
3828 data->arg.u.device.specdata1 = MAJOR(rdev);
3829 data->arg.u.device.specdata2 = MINOR(rdev);
3830 } else if (!S_ISSOCK(mode)) {
3831 status = -EINVAL;
3832 goto out_free;
3833 }
3834
3835 data->arg.label = label;
3836 status = nfs4_do_create(dir, dentry, data);
3837out_free:
3838 nfs4_free_createdata(data);
3839out:
3840 return status;
3841}
3842
3843static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3844 struct iattr *sattr, dev_t rdev)
3845{
3846 struct nfs4_exception exception = { };
3847 struct nfs4_label l, *label = NULL;
3848 int err;
3849
3850 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3851
3852 sattr->ia_mode &= ~current_umask();
3853 do {
3854 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3855 trace_nfs4_mknod(dir, &dentry->d_name, err);
3856 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3857 &exception);
3858 } while (exception.retry);
3859
3860 nfs4_label_release_security(label);
3861
3862 return err;
3863}
3864
3865static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3866 struct nfs_fsstat *fsstat)
3867{
3868 struct nfs4_statfs_arg args = {
3869 .fh = fhandle,
3870 .bitmask = server->attr_bitmask,
3871 };
3872 struct nfs4_statfs_res res = {
3873 .fsstat = fsstat,
3874 };
3875 struct rpc_message msg = {
3876 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3877 .rpc_argp = &args,
3878 .rpc_resp = &res,
3879 };
3880
3881 nfs_fattr_init(fsstat->fattr);
3882 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3883}
3884
3885static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3886{
3887 struct nfs4_exception exception = { };
3888 int err;
3889 do {
3890 err = nfs4_handle_exception(server,
3891 _nfs4_proc_statfs(server, fhandle, fsstat),
3892 &exception);
3893 } while (exception.retry);
3894 return err;
3895}
3896
3897static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3898 struct nfs_fsinfo *fsinfo)
3899{
3900 struct nfs4_fsinfo_arg args = {
3901 .fh = fhandle,
3902 .bitmask = server->attr_bitmask,
3903 };
3904 struct nfs4_fsinfo_res res = {
3905 .fsinfo = fsinfo,
3906 };
3907 struct rpc_message msg = {
3908 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3909 .rpc_argp = &args,
3910 .rpc_resp = &res,
3911 };
3912
3913 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3914}
3915
3916static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3917{
3918 struct nfs4_exception exception = { };
3919 unsigned long now = jiffies;
3920 int err;
3921
3922 do {
3923 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3924 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3925 if (err == 0) {
3926 struct nfs_client *clp = server->nfs_client;
3927
3928 spin_lock(&clp->cl_lock);
3929 clp->cl_lease_time = fsinfo->lease_time * HZ;
3930 clp->cl_last_renewal = now;
3931 spin_unlock(&clp->cl_lock);
3932 break;
3933 }
3934 err = nfs4_handle_exception(server, err, &exception);
3935 } while (exception.retry);
3936 return err;
3937}
3938
3939static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3940{
3941 int error;
3942
3943 nfs_fattr_init(fsinfo->fattr);
3944 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3945 if (error == 0) {
3946 /* block layout checks this! */
3947 server->pnfs_blksize = fsinfo->blksize;
3948 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3949 }
3950
3951 return error;
3952}
3953
3954static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3955 struct nfs_pathconf *pathconf)
3956{
3957 struct nfs4_pathconf_arg args = {
3958 .fh = fhandle,
3959 .bitmask = server->attr_bitmask,
3960 };
3961 struct nfs4_pathconf_res res = {
3962 .pathconf = pathconf,
3963 };
3964 struct rpc_message msg = {
3965 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3966 .rpc_argp = &args,
3967 .rpc_resp = &res,
3968 };
3969
3970 /* None of the pathconf attributes are mandatory to implement */
3971 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3972 memset(pathconf, 0, sizeof(*pathconf));
3973 return 0;
3974 }
3975
3976 nfs_fattr_init(pathconf->fattr);
3977 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3978}
3979
3980static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3981 struct nfs_pathconf *pathconf)
3982{
3983 struct nfs4_exception exception = { };
3984 int err;
3985
3986 do {
3987 err = nfs4_handle_exception(server,
3988 _nfs4_proc_pathconf(server, fhandle, pathconf),
3989 &exception);
3990 } while (exception.retry);
3991 return err;
3992}
3993
3994int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3995 const struct nfs_open_context *ctx,
3996 const struct nfs_lock_context *l_ctx,
3997 fmode_t fmode)
3998{
3999 const struct nfs_lockowner *lockowner = NULL;
4000
4001 if (l_ctx != NULL)
4002 lockowner = &l_ctx->lockowner;
4003 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4004}
4005EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4006
4007static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4008 const struct nfs_open_context *ctx,
4009 const struct nfs_lock_context *l_ctx,
4010 fmode_t fmode)
4011{
4012 nfs4_stateid current_stateid;
4013
4014 /* If the current stateid represents a lost lock, then exit */
4015 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4016 return true;
4017 return nfs4_stateid_match(stateid, &current_stateid);
4018}
4019
4020static bool nfs4_error_stateid_expired(int err)
4021{
4022 switch (err) {
4023 case -NFS4ERR_DELEG_REVOKED:
4024 case -NFS4ERR_ADMIN_REVOKED:
4025 case -NFS4ERR_BAD_STATEID:
4026 case -NFS4ERR_STALE_STATEID:
4027 case -NFS4ERR_OLD_STATEID:
4028 case -NFS4ERR_OPENMODE:
4029 case -NFS4ERR_EXPIRED:
4030 return true;
4031 }
4032 return false;
4033}
4034
4035void __nfs4_read_done_cb(struct nfs_read_data *data)
4036{
4037 nfs_invalidate_atime(data->header->inode);
4038}
4039
4040static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4041{
4042 struct nfs_server *server = NFS_SERVER(data->header->inode);
4043
4044 trace_nfs4_read(data, task->tk_status);
4045 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4046 rpc_restart_call_prepare(task);
4047 return -EAGAIN;
4048 }
4049
4050 __nfs4_read_done_cb(data);
4051 if (task->tk_status > 0)
4052 renew_lease(server, data->timestamp);
4053 return 0;
4054}
4055
4056static bool nfs4_read_stateid_changed(struct rpc_task *task,
4057 struct nfs_readargs *args)
4058{
4059
4060 if (!nfs4_error_stateid_expired(task->tk_status) ||
4061 nfs4_stateid_is_current(&args->stateid,
4062 args->context,
4063 args->lock_context,
4064 FMODE_READ))
4065 return false;
4066 rpc_restart_call_prepare(task);
4067 return true;
4068}
4069
4070static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4071{
4072
4073 dprintk("--> %s\n", __func__);
4074
4075 if (!nfs4_sequence_done(task, &data->res.seq_res))
4076 return -EAGAIN;
4077 if (nfs4_read_stateid_changed(task, &data->args))
4078 return -EAGAIN;
4079 return data->read_done_cb ? data->read_done_cb(task, data) :
4080 nfs4_read_done_cb(task, data);
4081}
4082
4083static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4084{
4085 data->timestamp = jiffies;
4086 data->read_done_cb = nfs4_read_done_cb;
4087 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4088 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4089}
4090
4091static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4092{
4093 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4094 &data->args.seq_args,
4095 &data->res.seq_res,
4096 task))
4097 return 0;
4098 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4099 data->args.lock_context, FMODE_READ) == -EIO)
4100 return -EIO;
4101 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4102 return -EIO;
4103 return 0;
4104}
4105
4106static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4107{
4108 struct inode *inode = data->header->inode;
4109
4110 trace_nfs4_write(data, task->tk_status);
4111 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4112 rpc_restart_call_prepare(task);
4113 return -EAGAIN;
4114 }
4115 if (task->tk_status >= 0) {
4116 renew_lease(NFS_SERVER(inode), data->timestamp);
4117 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4118 }
4119 return 0;
4120}
4121
4122static bool nfs4_write_stateid_changed(struct rpc_task *task,
4123 struct nfs_writeargs *args)
4124{
4125
4126 if (!nfs4_error_stateid_expired(task->tk_status) ||
4127 nfs4_stateid_is_current(&args->stateid,
4128 args->context,
4129 args->lock_context,
4130 FMODE_WRITE))
4131 return false;
4132 rpc_restart_call_prepare(task);
4133 return true;
4134}
4135
4136static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4137{
4138 if (!nfs4_sequence_done(task, &data->res.seq_res))
4139 return -EAGAIN;
4140 if (nfs4_write_stateid_changed(task, &data->args))
4141 return -EAGAIN;
4142 return data->write_done_cb ? data->write_done_cb(task, data) :
4143 nfs4_write_done_cb(task, data);
4144}
4145
4146static
4147bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4148{
4149 const struct nfs_pgio_header *hdr = data->header;
4150
4151 /* Don't request attributes for pNFS or O_DIRECT writes */
4152 if (data->ds_clp != NULL || hdr->dreq != NULL)
4153 return false;
4154 /* Otherwise, request attributes if and only if we don't hold
4155 * a delegation
4156 */
4157 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4158}
4159
4160static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4161{
4162 struct nfs_server *server = NFS_SERVER(data->header->inode);
4163
4164 if (!nfs4_write_need_cache_consistency_data(data)) {
4165 data->args.bitmask = NULL;
4166 data->res.fattr = NULL;
4167 } else
4168 data->args.bitmask = server->cache_consistency_bitmask;
4169
4170 if (!data->write_done_cb)
4171 data->write_done_cb = nfs4_write_done_cb;
4172 data->res.server = server;
4173 data->timestamp = jiffies;
4174
4175 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4176 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4177}
4178
4179static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4180{
4181 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4182 &data->args.seq_args,
4183 &data->res.seq_res,
4184 task))
4185 return 0;
4186 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4187 data->args.lock_context, FMODE_WRITE) == -EIO)
4188 return -EIO;
4189 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4190 return -EIO;
4191 return 0;
4192}
4193
4194static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4195{
4196 nfs4_setup_sequence(NFS_SERVER(data->inode),
4197 &data->args.seq_args,
4198 &data->res.seq_res,
4199 task);
4200}
4201
4202static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4203{
4204 struct inode *inode = data->inode;
4205
4206 trace_nfs4_commit(data, task->tk_status);
4207 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4208 rpc_restart_call_prepare(task);
4209 return -EAGAIN;
4210 }
4211 return 0;
4212}
4213
4214static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4215{
4216 if (!nfs4_sequence_done(task, &data->res.seq_res))
4217 return -EAGAIN;
4218 return data->commit_done_cb(task, data);
4219}
4220
4221static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4222{
4223 struct nfs_server *server = NFS_SERVER(data->inode);
4224
4225 if (data->commit_done_cb == NULL)
4226 data->commit_done_cb = nfs4_commit_done_cb;
4227 data->res.server = server;
4228 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4229 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4230}
4231
4232struct nfs4_renewdata {
4233 struct nfs_client *client;
4234 unsigned long timestamp;
4235};
4236
4237/*
4238 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4239 * standalone procedure for queueing an asynchronous RENEW.
4240 */
4241static void nfs4_renew_release(void *calldata)
4242{
4243 struct nfs4_renewdata *data = calldata;
4244 struct nfs_client *clp = data->client;
4245
4246 if (atomic_read(&clp->cl_count) > 1)
4247 nfs4_schedule_state_renewal(clp);
4248 nfs_put_client(clp);
4249 kfree(data);
4250}
4251
4252static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4253{
4254 struct nfs4_renewdata *data = calldata;
4255 struct nfs_client *clp = data->client;
4256 unsigned long timestamp = data->timestamp;
4257
4258 trace_nfs4_renew_async(clp, task->tk_status);
4259 switch (task->tk_status) {
4260 case 0:
4261 break;
4262 case -NFS4ERR_LEASE_MOVED:
4263 nfs4_schedule_lease_moved_recovery(clp);
4264 break;
4265 default:
4266 /* Unless we're shutting down, schedule state recovery! */
4267 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4268 return;
4269 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4270 nfs4_schedule_lease_recovery(clp);
4271 return;
4272 }
4273 nfs4_schedule_path_down_recovery(clp);
4274 }
4275 do_renew_lease(clp, timestamp);
4276}
4277
4278static const struct rpc_call_ops nfs4_renew_ops = {
4279 .rpc_call_done = nfs4_renew_done,
4280 .rpc_release = nfs4_renew_release,
4281};
4282
4283static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4284{
4285 struct rpc_message msg = {
4286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4287 .rpc_argp = clp,
4288 .rpc_cred = cred,
4289 };
4290 struct nfs4_renewdata *data;
4291
4292 if (renew_flags == 0)
4293 return 0;
4294 if (!atomic_inc_not_zero(&clp->cl_count))
4295 return -EIO;
4296 data = kmalloc(sizeof(*data), GFP_NOFS);
4297 if (data == NULL)
4298 return -ENOMEM;
4299 data->client = clp;
4300 data->timestamp = jiffies;
4301 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4302 &nfs4_renew_ops, data);
4303}
4304
4305static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4306{
4307 struct rpc_message msg = {
4308 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4309 .rpc_argp = clp,
4310 .rpc_cred = cred,
4311 };
4312 unsigned long now = jiffies;
4313 int status;
4314
4315 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4316 if (status < 0)
4317 return status;
4318 do_renew_lease(clp, now);
4319 return 0;
4320}
4321
4322static inline int nfs4_server_supports_acls(struct nfs_server *server)
4323{
4324 return server->caps & NFS_CAP_ACLS;
4325}
4326
4327/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4328 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4329 * the stack.
4330 */
4331#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4332
4333static int buf_to_pages_noslab(const void *buf, size_t buflen,
4334 struct page **pages, unsigned int *pgbase)
4335{
4336 struct page *newpage, **spages;
4337 int rc = 0;
4338 size_t len;
4339 spages = pages;
4340
4341 do {
4342 len = min_t(size_t, PAGE_SIZE, buflen);
4343 newpage = alloc_page(GFP_KERNEL);
4344
4345 if (newpage == NULL)
4346 goto unwind;
4347 memcpy(page_address(newpage), buf, len);
4348 buf += len;
4349 buflen -= len;
4350 *pages++ = newpage;
4351 rc++;
4352 } while (buflen != 0);
4353
4354 return rc;
4355
4356unwind:
4357 for(; rc > 0; rc--)
4358 __free_page(spages[rc-1]);
4359 return -ENOMEM;
4360}
4361
4362struct nfs4_cached_acl {
4363 int cached;
4364 size_t len;
4365 char data[0];
4366};
4367
4368static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4369{
4370 struct nfs_inode *nfsi = NFS_I(inode);
4371
4372 spin_lock(&inode->i_lock);
4373 kfree(nfsi->nfs4_acl);
4374 nfsi->nfs4_acl = acl;
4375 spin_unlock(&inode->i_lock);
4376}
4377
4378static void nfs4_zap_acl_attr(struct inode *inode)
4379{
4380 nfs4_set_cached_acl(inode, NULL);
4381}
4382
4383static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4384{
4385 struct nfs_inode *nfsi = NFS_I(inode);
4386 struct nfs4_cached_acl *acl;
4387 int ret = -ENOENT;
4388
4389 spin_lock(&inode->i_lock);
4390 acl = nfsi->nfs4_acl;
4391 if (acl == NULL)
4392 goto out;
4393 if (buf == NULL) /* user is just asking for length */
4394 goto out_len;
4395 if (acl->cached == 0)
4396 goto out;
4397 ret = -ERANGE; /* see getxattr(2) man page */
4398 if (acl->len > buflen)
4399 goto out;
4400 memcpy(buf, acl->data, acl->len);
4401out_len:
4402 ret = acl->len;
4403out:
4404 spin_unlock(&inode->i_lock);
4405 return ret;
4406}
4407
4408static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4409{
4410 struct nfs4_cached_acl *acl;
4411 size_t buflen = sizeof(*acl) + acl_len;
4412
4413 if (buflen <= PAGE_SIZE) {
4414 acl = kmalloc(buflen, GFP_KERNEL);
4415 if (acl == NULL)
4416 goto out;
4417 acl->cached = 1;
4418 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4419 } else {
4420 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4421 if (acl == NULL)
4422 goto out;
4423 acl->cached = 0;
4424 }
4425 acl->len = acl_len;
4426out:
4427 nfs4_set_cached_acl(inode, acl);
4428}
4429
4430/*
4431 * The getxattr API returns the required buffer length when called with a
4432 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4433 * the required buf. On a NULL buf, we send a page of data to the server
4434 * guessing that the ACL request can be serviced by a page. If so, we cache
4435 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4436 * the cache. If not so, we throw away the page, and cache the required
4437 * length. The next getxattr call will then produce another round trip to
4438 * the server, this time with the input buf of the required size.
4439 */
4440static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4441{
4442 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4443 struct nfs_getaclargs args = {
4444 .fh = NFS_FH(inode),
4445 .acl_pages = pages,
4446 .acl_len = buflen,
4447 };
4448 struct nfs_getaclres res = {
4449 .acl_len = buflen,
4450 };
4451 struct rpc_message msg = {
4452 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4453 .rpc_argp = &args,
4454 .rpc_resp = &res,
4455 };
4456 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4457 int ret = -ENOMEM, i;
4458
4459 /* As long as we're doing a round trip to the server anyway,
4460 * let's be prepared for a page of acl data. */
4461 if (npages == 0)
4462 npages = 1;
4463 if (npages > ARRAY_SIZE(pages))
4464 return -ERANGE;
4465
4466 for (i = 0; i < npages; i++) {
4467 pages[i] = alloc_page(GFP_KERNEL);
4468 if (!pages[i])
4469 goto out_free;
4470 }
4471
4472 /* for decoding across pages */
4473 res.acl_scratch = alloc_page(GFP_KERNEL);
4474 if (!res.acl_scratch)
4475 goto out_free;
4476
4477 args.acl_len = npages * PAGE_SIZE;
4478 args.acl_pgbase = 0;
4479
4480 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4481 __func__, buf, buflen, npages, args.acl_len);
4482 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4483 &msg, &args.seq_args, &res.seq_res, 0);
4484 if (ret)
4485 goto out_free;
4486
4487 /* Handle the case where the passed-in buffer is too short */
4488 if (res.acl_flags & NFS4_ACL_TRUNC) {
4489 /* Did the user only issue a request for the acl length? */
4490 if (buf == NULL)
4491 goto out_ok;
4492 ret = -ERANGE;
4493 goto out_free;
4494 }
4495 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4496 if (buf) {
4497 if (res.acl_len > buflen) {
4498 ret = -ERANGE;
4499 goto out_free;
4500 }
4501 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4502 }
4503out_ok:
4504 ret = res.acl_len;
4505out_free:
4506 for (i = 0; i < npages; i++)
4507 if (pages[i])
4508 __free_page(pages[i]);
4509 if (res.acl_scratch)
4510 __free_page(res.acl_scratch);
4511 return ret;
4512}
4513
4514static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4515{
4516 struct nfs4_exception exception = { };
4517 ssize_t ret;
4518 do {
4519 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4520 trace_nfs4_get_acl(inode, ret);
4521 if (ret >= 0)
4522 break;
4523 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4524 } while (exception.retry);
4525 return ret;
4526}
4527
4528static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4529{
4530 struct nfs_server *server = NFS_SERVER(inode);
4531 int ret;
4532
4533 if (!nfs4_server_supports_acls(server))
4534 return -EOPNOTSUPP;
4535 ret = nfs_revalidate_inode(server, inode);
4536 if (ret < 0)
4537 return ret;
4538 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4539 nfs_zap_acl_cache(inode);
4540 ret = nfs4_read_cached_acl(inode, buf, buflen);
4541 if (ret != -ENOENT)
4542 /* -ENOENT is returned if there is no ACL or if there is an ACL
4543 * but no cached acl data, just the acl length */
4544 return ret;
4545 return nfs4_get_acl_uncached(inode, buf, buflen);
4546}
4547
4548static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4549{
4550 struct nfs_server *server = NFS_SERVER(inode);
4551 struct page *pages[NFS4ACL_MAXPAGES];
4552 struct nfs_setaclargs arg = {
4553 .fh = NFS_FH(inode),
4554 .acl_pages = pages,
4555 .acl_len = buflen,
4556 };
4557 struct nfs_setaclres res;
4558 struct rpc_message msg = {
4559 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4560 .rpc_argp = &arg,
4561 .rpc_resp = &res,
4562 };
4563 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4564 int ret, i;
4565
4566 if (!nfs4_server_supports_acls(server))
4567 return -EOPNOTSUPP;
4568 if (npages > ARRAY_SIZE(pages))
4569 return -ERANGE;
4570 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4571 if (i < 0)
4572 return i;
4573 nfs4_inode_return_delegation(inode);
4574 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4575
4576 /*
4577 * Free each page after tx, so the only ref left is
4578 * held by the network stack
4579 */
4580 for (; i > 0; i--)
4581 put_page(pages[i-1]);
4582
4583 /*
4584 * Acl update can result in inode attribute update.
4585 * so mark the attribute cache invalid.
4586 */
4587 spin_lock(&inode->i_lock);
4588 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4589 spin_unlock(&inode->i_lock);
4590 nfs_access_zap_cache(inode);
4591 nfs_zap_acl_cache(inode);
4592 return ret;
4593}
4594
4595static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4596{
4597 struct nfs4_exception exception = { };
4598 int err;
4599 do {
4600 err = __nfs4_proc_set_acl(inode, buf, buflen);
4601 trace_nfs4_set_acl(inode, err);
4602 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4603 &exception);
4604 } while (exception.retry);
4605 return err;
4606}
4607
4608#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4609static int _nfs4_get_security_label(struct inode *inode, void *buf,
4610 size_t buflen)
4611{
4612 struct nfs_server *server = NFS_SERVER(inode);
4613 struct nfs_fattr fattr;
4614 struct nfs4_label label = {0, 0, buflen, buf};
4615
4616 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4617 struct nfs4_getattr_arg arg = {
4618 .fh = NFS_FH(inode),
4619 .bitmask = bitmask,
4620 };
4621 struct nfs4_getattr_res res = {
4622 .fattr = &fattr,
4623 .label = &label,
4624 .server = server,
4625 };
4626 struct rpc_message msg = {
4627 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4628 .rpc_argp = &arg,
4629 .rpc_resp = &res,
4630 };
4631 int ret;
4632
4633 nfs_fattr_init(&fattr);
4634
4635 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4636 if (ret)
4637 return ret;
4638 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4639 return -ENOENT;
4640 if (buflen < label.len)
4641 return -ERANGE;
4642 return 0;
4643}
4644
4645static int nfs4_get_security_label(struct inode *inode, void *buf,
4646 size_t buflen)
4647{
4648 struct nfs4_exception exception = { };
4649 int err;
4650
4651 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4652 return -EOPNOTSUPP;
4653
4654 do {
4655 err = _nfs4_get_security_label(inode, buf, buflen);
4656 trace_nfs4_get_security_label(inode, err);
4657 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4658 &exception);
4659 } while (exception.retry);
4660 return err;
4661}
4662
4663static int _nfs4_do_set_security_label(struct inode *inode,
4664 struct nfs4_label *ilabel,
4665 struct nfs_fattr *fattr,
4666 struct nfs4_label *olabel)
4667{
4668
4669 struct iattr sattr = {0};
4670 struct nfs_server *server = NFS_SERVER(inode);
4671 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4672 struct nfs_setattrargs arg = {
4673 .fh = NFS_FH(inode),
4674 .iap = &sattr,
4675 .server = server,
4676 .bitmask = bitmask,
4677 .label = ilabel,
4678 };
4679 struct nfs_setattrres res = {
4680 .fattr = fattr,
4681 .label = olabel,
4682 .server = server,
4683 };
4684 struct rpc_message msg = {
4685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4686 .rpc_argp = &arg,
4687 .rpc_resp = &res,
4688 };
4689 int status;
4690
4691 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4692
4693 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4694 if (status)
4695 dprintk("%s failed: %d\n", __func__, status);
4696
4697 return status;
4698}
4699
4700static int nfs4_do_set_security_label(struct inode *inode,
4701 struct nfs4_label *ilabel,
4702 struct nfs_fattr *fattr,
4703 struct nfs4_label *olabel)
4704{
4705 struct nfs4_exception exception = { };
4706 int err;
4707
4708 do {
4709 err = _nfs4_do_set_security_label(inode, ilabel,
4710 fattr, olabel);
4711 trace_nfs4_set_security_label(inode, err);
4712 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4713 &exception);
4714 } while (exception.retry);
4715 return err;
4716}
4717
4718static int
4719nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4720{
4721 struct nfs4_label ilabel, *olabel = NULL;
4722 struct nfs_fattr fattr;
4723 struct rpc_cred *cred;
4724 struct inode *inode = dentry->d_inode;
4725 int status;
4726
4727 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4728 return -EOPNOTSUPP;
4729
4730 nfs_fattr_init(&fattr);
4731
4732 ilabel.pi = 0;
4733 ilabel.lfs = 0;
4734 ilabel.label = (char *)buf;
4735 ilabel.len = buflen;
4736
4737 cred = rpc_lookup_cred();
4738 if (IS_ERR(cred))
4739 return PTR_ERR(cred);
4740
4741 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4742 if (IS_ERR(olabel)) {
4743 status = -PTR_ERR(olabel);
4744 goto out;
4745 }
4746
4747 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4748 if (status == 0)
4749 nfs_setsecurity(inode, &fattr, olabel);
4750
4751 nfs4_label_free(olabel);
4752out:
4753 put_rpccred(cred);
4754 return status;
4755}
4756#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4757
4758
4759static int
4760nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4761{
4762 struct nfs_client *clp = server->nfs_client;
4763
4764 if (task->tk_status >= 0)
4765 return 0;
4766 switch(task->tk_status) {
4767 case -NFS4ERR_DELEG_REVOKED:
4768 case -NFS4ERR_ADMIN_REVOKED:
4769 case -NFS4ERR_BAD_STATEID:
4770 if (state == NULL)
4771 break;
4772 nfs_remove_bad_delegation(state->inode);
4773 case -NFS4ERR_OPENMODE:
4774 if (state == NULL)
4775 break;
4776 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4777 goto recovery_failed;
4778 goto wait_on_recovery;
4779 case -NFS4ERR_EXPIRED:
4780 if (state != NULL) {
4781 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4782 goto recovery_failed;
4783 }
4784 case -NFS4ERR_STALE_STATEID:
4785 case -NFS4ERR_STALE_CLIENTID:
4786 nfs4_schedule_lease_recovery(clp);
4787 goto wait_on_recovery;
4788 case -NFS4ERR_MOVED:
4789 if (nfs4_schedule_migration_recovery(server) < 0)
4790 goto recovery_failed;
4791 goto wait_on_recovery;
4792 case -NFS4ERR_LEASE_MOVED:
4793 nfs4_schedule_lease_moved_recovery(clp);
4794 goto wait_on_recovery;
4795#if defined(CONFIG_NFS_V4_1)
4796 case -NFS4ERR_BADSESSION:
4797 case -NFS4ERR_BADSLOT:
4798 case -NFS4ERR_BAD_HIGH_SLOT:
4799 case -NFS4ERR_DEADSESSION:
4800 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4801 case -NFS4ERR_SEQ_FALSE_RETRY:
4802 case -NFS4ERR_SEQ_MISORDERED:
4803 dprintk("%s ERROR %d, Reset session\n", __func__,
4804 task->tk_status);
4805 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4806 goto wait_on_recovery;
4807#endif /* CONFIG_NFS_V4_1 */
4808 case -NFS4ERR_DELAY:
4809 nfs_inc_server_stats(server, NFSIOS_DELAY);
4810 case -NFS4ERR_GRACE:
4811 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4812 case -NFS4ERR_RETRY_UNCACHED_REP:
4813 case -NFS4ERR_OLD_STATEID:
4814 goto restart_call;
4815 }
4816 task->tk_status = nfs4_map_errors(task->tk_status);
4817 return 0;
4818recovery_failed:
4819 task->tk_status = -EIO;
4820 return 0;
4821wait_on_recovery:
4822 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4823 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4824 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4825 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4826 goto recovery_failed;
4827restart_call:
4828 task->tk_status = 0;
4829 return -EAGAIN;
4830}
4831
4832static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4833 nfs4_verifier *bootverf)
4834{
4835 __be32 verf[2];
4836
4837 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4838 /* An impossible timestamp guarantees this value
4839 * will never match a generated boot time. */
4840 verf[0] = 0;
4841 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4842 } else {
4843 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4844 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4845 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4846 }
4847 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4848}
4849
4850static unsigned int
4851nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4852 char *buf, size_t len)
4853{
4854 unsigned int result;
4855
4856 rcu_read_lock();
4857 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4858 clp->cl_ipaddr,
4859 rpc_peeraddr2str(clp->cl_rpcclient,
4860 RPC_DISPLAY_ADDR),
4861 rpc_peeraddr2str(clp->cl_rpcclient,
4862 RPC_DISPLAY_PROTO));
4863 rcu_read_unlock();
4864 return result;
4865}
4866
4867static unsigned int
4868nfs4_init_uniform_client_string(const struct nfs_client *clp,
4869 char *buf, size_t len)
4870{
4871 const char *nodename = clp->cl_rpcclient->cl_nodename;
4872
4873 if (nfs4_client_id_uniquifier[0] != '\0')
4874 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4875 clp->rpc_ops->version,
4876 clp->cl_minorversion,
4877 nfs4_client_id_uniquifier,
4878 nodename);
4879 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4880 clp->rpc_ops->version, clp->cl_minorversion,
4881 nodename);
4882}
4883
4884/**
4885 * nfs4_proc_setclientid - Negotiate client ID
4886 * @clp: state data structure
4887 * @program: RPC program for NFSv4 callback service
4888 * @port: IP port number for NFS4 callback service
4889 * @cred: RPC credential to use for this call
4890 * @res: where to place the result
4891 *
4892 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4893 */
4894int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4895 unsigned short port, struct rpc_cred *cred,
4896 struct nfs4_setclientid_res *res)
4897{
4898 nfs4_verifier sc_verifier;
4899 struct nfs4_setclientid setclientid = {
4900 .sc_verifier = &sc_verifier,
4901 .sc_prog = program,
4902 .sc_cb_ident = clp->cl_cb_ident,
4903 };
4904 struct rpc_message msg = {
4905 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4906 .rpc_argp = &setclientid,
4907 .rpc_resp = res,
4908 .rpc_cred = cred,
4909 };
4910 int status;
4911
4912 /* nfs_client_id4 */
4913 nfs4_init_boot_verifier(clp, &sc_verifier);
4914 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4915 setclientid.sc_name_len =
4916 nfs4_init_uniform_client_string(clp,
4917 setclientid.sc_name,
4918 sizeof(setclientid.sc_name));
4919 else
4920 setclientid.sc_name_len =
4921 nfs4_init_nonuniform_client_string(clp,
4922 setclientid.sc_name,
4923 sizeof(setclientid.sc_name));
4924 /* cb_client4 */
4925 rcu_read_lock();
4926 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4927 sizeof(setclientid.sc_netid), "%s",
4928 rpc_peeraddr2str(clp->cl_rpcclient,
4929 RPC_DISPLAY_NETID));
4930 rcu_read_unlock();
4931 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4932 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4933 clp->cl_ipaddr, port >> 8, port & 255);
4934
4935 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
4936 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4937 setclientid.sc_name_len, setclientid.sc_name);
4938 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4939 trace_nfs4_setclientid(clp, status);
4940 dprintk("NFS reply setclientid: %d\n", status);
4941 return status;
4942}
4943
4944/**
4945 * nfs4_proc_setclientid_confirm - Confirm client ID
4946 * @clp: state data structure
4947 * @res: result of a previous SETCLIENTID
4948 * @cred: RPC credential to use for this call
4949 *
4950 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4951 */
4952int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4953 struct nfs4_setclientid_res *arg,
4954 struct rpc_cred *cred)
4955{
4956 struct rpc_message msg = {
4957 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4958 .rpc_argp = arg,
4959 .rpc_cred = cred,
4960 };
4961 int status;
4962
4963 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
4964 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4965 clp->cl_clientid);
4966 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4967 trace_nfs4_setclientid_confirm(clp, status);
4968 dprintk("NFS reply setclientid_confirm: %d\n", status);
4969 return status;
4970}
4971
4972struct nfs4_delegreturndata {
4973 struct nfs4_delegreturnargs args;
4974 struct nfs4_delegreturnres res;
4975 struct nfs_fh fh;
4976 nfs4_stateid stateid;
4977 unsigned long timestamp;
4978 struct nfs_fattr fattr;
4979 int rpc_status;
4980};
4981
4982static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4983{
4984 struct nfs4_delegreturndata *data = calldata;
4985
4986 if (!nfs4_sequence_done(task, &data->res.seq_res))
4987 return;
4988
4989 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4990 switch (task->tk_status) {
4991 case 0:
4992 renew_lease(data->res.server, data->timestamp);
4993 break;
4994 case -NFS4ERR_ADMIN_REVOKED:
4995 case -NFS4ERR_DELEG_REVOKED:
4996 case -NFS4ERR_BAD_STATEID:
4997 case -NFS4ERR_OLD_STATEID:
4998 case -NFS4ERR_STALE_STATEID:
4999 case -NFS4ERR_EXPIRED:
5000 task->tk_status = 0;
5001 break;
5002 default:
5003 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5004 -EAGAIN) {
5005 rpc_restart_call_prepare(task);
5006 return;
5007 }
5008 }
5009 data->rpc_status = task->tk_status;
5010}
5011
5012static void nfs4_delegreturn_release(void *calldata)
5013{
5014 kfree(calldata);
5015}
5016
5017static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5018{
5019 struct nfs4_delegreturndata *d_data;
5020
5021 d_data = (struct nfs4_delegreturndata *)data;
5022
5023 nfs4_setup_sequence(d_data->res.server,
5024 &d_data->args.seq_args,
5025 &d_data->res.seq_res,
5026 task);
5027}
5028
5029static const struct rpc_call_ops nfs4_delegreturn_ops = {
5030 .rpc_call_prepare = nfs4_delegreturn_prepare,
5031 .rpc_call_done = nfs4_delegreturn_done,
5032 .rpc_release = nfs4_delegreturn_release,
5033};
5034
5035static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5036{
5037 struct nfs4_delegreturndata *data;
5038 struct nfs_server *server = NFS_SERVER(inode);
5039 struct rpc_task *task;
5040 struct rpc_message msg = {
5041 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5042 .rpc_cred = cred,
5043 };
5044 struct rpc_task_setup task_setup_data = {
5045 .rpc_client = server->client,
5046 .rpc_message = &msg,
5047 .callback_ops = &nfs4_delegreturn_ops,
5048 .flags = RPC_TASK_ASYNC,
5049 };
5050 int status = 0;
5051
5052 data = kzalloc(sizeof(*data), GFP_NOFS);
5053 if (data == NULL)
5054 return -ENOMEM;
5055 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5056 data->args.fhandle = &data->fh;
5057 data->args.stateid = &data->stateid;
5058 data->args.bitmask = server->cache_consistency_bitmask;
5059 nfs_copy_fh(&data->fh, NFS_FH(inode));
5060 nfs4_stateid_copy(&data->stateid, stateid);
5061 data->res.fattr = &data->fattr;
5062 data->res.server = server;
5063 nfs_fattr_init(data->res.fattr);
5064 data->timestamp = jiffies;
5065 data->rpc_status = 0;
5066
5067 task_setup_data.callback_data = data;
5068 msg.rpc_argp = &data->args;
5069 msg.rpc_resp = &data->res;
5070 task = rpc_run_task(&task_setup_data);
5071 if (IS_ERR(task))
5072 return PTR_ERR(task);
5073 if (!issync)
5074 goto out;
5075 status = nfs4_wait_for_completion_rpc_task(task);
5076 if (status != 0)
5077 goto out;
5078 status = data->rpc_status;
5079 if (status == 0)
5080 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5081 else
5082 nfs_refresh_inode(inode, &data->fattr);
5083out:
5084 rpc_put_task(task);
5085 return status;
5086}
5087
5088int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5089{
5090 struct nfs_server *server = NFS_SERVER(inode);
5091 struct nfs4_exception exception = { };
5092 int err;
5093 do {
5094 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5095 trace_nfs4_delegreturn(inode, err);
5096 switch (err) {
5097 case -NFS4ERR_STALE_STATEID:
5098 case -NFS4ERR_EXPIRED:
5099 case 0:
5100 return 0;
5101 }
5102 err = nfs4_handle_exception(server, err, &exception);
5103 } while (exception.retry);
5104 return err;
5105}
5106
5107#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5108#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5109
5110/*
5111 * sleep, with exponential backoff, and retry the LOCK operation.
5112 */
5113static unsigned long
5114nfs4_set_lock_task_retry(unsigned long timeout)
5115{
5116 freezable_schedule_timeout_killable_unsafe(timeout);
5117 timeout <<= 1;
5118 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5119 return NFS4_LOCK_MAXTIMEOUT;
5120 return timeout;
5121}
5122
5123static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5124{
5125 struct inode *inode = state->inode;
5126 struct nfs_server *server = NFS_SERVER(inode);
5127 struct nfs_client *clp = server->nfs_client;
5128 struct nfs_lockt_args arg = {
5129 .fh = NFS_FH(inode),
5130 .fl = request,
5131 };
5132 struct nfs_lockt_res res = {
5133 .denied = request,
5134 };
5135 struct rpc_message msg = {
5136 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5137 .rpc_argp = &arg,
5138 .rpc_resp = &res,
5139 .rpc_cred = state->owner->so_cred,
5140 };
5141 struct nfs4_lock_state *lsp;
5142 int status;
5143
5144 arg.lock_owner.clientid = clp->cl_clientid;
5145 status = nfs4_set_lock_state(state, request);
5146 if (status != 0)
5147 goto out;
5148 lsp = request->fl_u.nfs4_fl.owner;
5149 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5150 arg.lock_owner.s_dev = server->s_dev;
5151 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5152 switch (status) {
5153 case 0:
5154 request->fl_type = F_UNLCK;
5155 break;
5156 case -NFS4ERR_DENIED:
5157 status = 0;
5158 }
5159 request->fl_ops->fl_release_private(request);
5160 request->fl_ops = NULL;
5161out:
5162 return status;
5163}
5164
5165static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5166{
5167 struct nfs4_exception exception = { };
5168 int err;
5169
5170 do {
5171 err = _nfs4_proc_getlk(state, cmd, request);
5172 trace_nfs4_get_lock(request, state, cmd, err);
5173 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5174 &exception);
5175 } while (exception.retry);
5176 return err;
5177}
5178
5179static int do_vfs_lock(struct file *file, struct file_lock *fl)
5180{
5181 int res = 0;
5182 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5183 case FL_POSIX:
5184 res = posix_lock_file_wait(file, fl);
5185 break;
5186 case FL_FLOCK:
5187 res = flock_lock_file_wait(file, fl);
5188 break;
5189 default:
5190 BUG();
5191 }
5192 return res;
5193}
5194
5195struct nfs4_unlockdata {
5196 struct nfs_locku_args arg;
5197 struct nfs_locku_res res;
5198 struct nfs4_lock_state *lsp;
5199 struct nfs_open_context *ctx;
5200 struct file_lock fl;
5201 const struct nfs_server *server;
5202 unsigned long timestamp;
5203};
5204
5205static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5206 struct nfs_open_context *ctx,
5207 struct nfs4_lock_state *lsp,
5208 struct nfs_seqid *seqid)
5209{
5210 struct nfs4_unlockdata *p;
5211 struct inode *inode = lsp->ls_state->inode;
5212
5213 p = kzalloc(sizeof(*p), GFP_NOFS);
5214 if (p == NULL)
5215 return NULL;
5216 p->arg.fh = NFS_FH(inode);
5217 p->arg.fl = &p->fl;
5218 p->arg.seqid = seqid;
5219 p->res.seqid = seqid;
5220 p->arg.stateid = &lsp->ls_stateid;
5221 p->lsp = lsp;
5222 atomic_inc(&lsp->ls_count);
5223 /* Ensure we don't close file until we're done freeing locks! */
5224 p->ctx = get_nfs_open_context(ctx);
5225 memcpy(&p->fl, fl, sizeof(p->fl));
5226 p->server = NFS_SERVER(inode);
5227 return p;
5228}
5229
5230static void nfs4_locku_release_calldata(void *data)
5231{
5232 struct nfs4_unlockdata *calldata = data;
5233 nfs_free_seqid(calldata->arg.seqid);
5234 nfs4_put_lock_state(calldata->lsp);
5235 put_nfs_open_context(calldata->ctx);
5236 kfree(calldata);
5237}
5238
5239static void nfs4_locku_done(struct rpc_task *task, void *data)
5240{
5241 struct nfs4_unlockdata *calldata = data;
5242
5243 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5244 return;
5245 switch (task->tk_status) {
5246 case 0:
5247 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5248 &calldata->res.stateid);
5249 renew_lease(calldata->server, calldata->timestamp);
5250 break;
5251 case -NFS4ERR_BAD_STATEID:
5252 case -NFS4ERR_OLD_STATEID:
5253 case -NFS4ERR_STALE_STATEID:
5254 case -NFS4ERR_EXPIRED:
5255 break;
5256 default:
5257 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5258 rpc_restart_call_prepare(task);
5259 }
5260 nfs_release_seqid(calldata->arg.seqid);
5261}
5262
5263static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5264{
5265 struct nfs4_unlockdata *calldata = data;
5266
5267 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5268 goto out_wait;
5269 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5270 /* Note: exit _without_ running nfs4_locku_done */
5271 goto out_no_action;
5272 }
5273 calldata->timestamp = jiffies;
5274 if (nfs4_setup_sequence(calldata->server,
5275 &calldata->arg.seq_args,
5276 &calldata->res.seq_res,
5277 task) != 0)
5278 nfs_release_seqid(calldata->arg.seqid);
5279 return;
5280out_no_action:
5281 task->tk_action = NULL;
5282out_wait:
5283 nfs4_sequence_done(task, &calldata->res.seq_res);
5284}
5285
5286static const struct rpc_call_ops nfs4_locku_ops = {
5287 .rpc_call_prepare = nfs4_locku_prepare,
5288 .rpc_call_done = nfs4_locku_done,
5289 .rpc_release = nfs4_locku_release_calldata,
5290};
5291
5292static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5293 struct nfs_open_context *ctx,
5294 struct nfs4_lock_state *lsp,
5295 struct nfs_seqid *seqid)
5296{
5297 struct nfs4_unlockdata *data;
5298 struct rpc_message msg = {
5299 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5300 .rpc_cred = ctx->cred,
5301 };
5302 struct rpc_task_setup task_setup_data = {
5303 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5304 .rpc_message = &msg,
5305 .callback_ops = &nfs4_locku_ops,
5306 .workqueue = nfsiod_workqueue,
5307 .flags = RPC_TASK_ASYNC,
5308 };
5309
5310 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5311 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5312
5313 /* Ensure this is an unlock - when canceling a lock, the
5314 * canceled lock is passed in, and it won't be an unlock.
5315 */
5316 fl->fl_type = F_UNLCK;
5317
5318 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5319 if (data == NULL) {
5320 nfs_free_seqid(seqid);
5321 return ERR_PTR(-ENOMEM);
5322 }
5323
5324 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5325 msg.rpc_argp = &data->arg;
5326 msg.rpc_resp = &data->res;
5327 task_setup_data.callback_data = data;
5328 return rpc_run_task(&task_setup_data);
5329}
5330
5331static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5332{
5333 struct inode *inode = state->inode;
5334 struct nfs4_state_owner *sp = state->owner;
5335 struct nfs_inode *nfsi = NFS_I(inode);
5336 struct nfs_seqid *seqid;
5337 struct nfs4_lock_state *lsp;
5338 struct rpc_task *task;
5339 int status = 0;
5340 unsigned char fl_flags = request->fl_flags;
5341
5342 status = nfs4_set_lock_state(state, request);
5343 /* Unlock _before_ we do the RPC call */
5344 request->fl_flags |= FL_EXISTS;
5345 /* Exclude nfs_delegation_claim_locks() */
5346 mutex_lock(&sp->so_delegreturn_mutex);
5347 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5348 down_read(&nfsi->rwsem);
5349 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5350 up_read(&nfsi->rwsem);
5351 mutex_unlock(&sp->so_delegreturn_mutex);
5352 goto out;
5353 }
5354 up_read(&nfsi->rwsem);
5355 mutex_unlock(&sp->so_delegreturn_mutex);
5356 if (status != 0)
5357 goto out;
5358 /* Is this a delegated lock? */
5359 lsp = request->fl_u.nfs4_fl.owner;
5360 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5361 goto out;
5362 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5363 status = -ENOMEM;
5364 if (seqid == NULL)
5365 goto out;
5366 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5367 status = PTR_ERR(task);
5368 if (IS_ERR(task))
5369 goto out;
5370 status = nfs4_wait_for_completion_rpc_task(task);
5371 rpc_put_task(task);
5372out:
5373 request->fl_flags = fl_flags;
5374 trace_nfs4_unlock(request, state, F_SETLK, status);
5375 return status;
5376}
5377
5378struct nfs4_lockdata {
5379 struct nfs_lock_args arg;
5380 struct nfs_lock_res res;
5381 struct nfs4_lock_state *lsp;
5382 struct nfs_open_context *ctx;
5383 struct file_lock fl;
5384 unsigned long timestamp;
5385 int rpc_status;
5386 int cancelled;
5387 struct nfs_server *server;
5388};
5389
5390static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5391 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5392 gfp_t gfp_mask)
5393{
5394 struct nfs4_lockdata *p;
5395 struct inode *inode = lsp->ls_state->inode;
5396 struct nfs_server *server = NFS_SERVER(inode);
5397
5398 p = kzalloc(sizeof(*p), gfp_mask);
5399 if (p == NULL)
5400 return NULL;
5401
5402 p->arg.fh = NFS_FH(inode);
5403 p->arg.fl = &p->fl;
5404 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5405 if (p->arg.open_seqid == NULL)
5406 goto out_free;
5407 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5408 if (p->arg.lock_seqid == NULL)
5409 goto out_free_seqid;
5410 p->arg.lock_stateid = &lsp->ls_stateid;
5411 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5412 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5413 p->arg.lock_owner.s_dev = server->s_dev;
5414 p->res.lock_seqid = p->arg.lock_seqid;
5415 p->lsp = lsp;
5416 p->server = server;
5417 atomic_inc(&lsp->ls_count);
5418 p->ctx = get_nfs_open_context(ctx);
5419 memcpy(&p->fl, fl, sizeof(p->fl));
5420 return p;
5421out_free_seqid:
5422 nfs_free_seqid(p->arg.open_seqid);
5423out_free:
5424 kfree(p);
5425 return NULL;
5426}
5427
5428static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5429{
5430 struct nfs4_lockdata *data = calldata;
5431 struct nfs4_state *state = data->lsp->ls_state;
5432
5433 dprintk("%s: begin!\n", __func__);
5434 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5435 goto out_wait;
5436 /* Do we need to do an open_to_lock_owner? */
5437 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5438 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5439 goto out_release_lock_seqid;
5440 }
5441 data->arg.open_stateid = &state->open_stateid;
5442 data->arg.new_lock_owner = 1;
5443 data->res.open_seqid = data->arg.open_seqid;
5444 } else
5445 data->arg.new_lock_owner = 0;
5446 if (!nfs4_valid_open_stateid(state)) {
5447 data->rpc_status = -EBADF;
5448 task->tk_action = NULL;
5449 goto out_release_open_seqid;
5450 }
5451 data->timestamp = jiffies;
5452 if (nfs4_setup_sequence(data->server,
5453 &data->arg.seq_args,
5454 &data->res.seq_res,
5455 task) == 0)
5456 return;
5457out_release_open_seqid:
5458 nfs_release_seqid(data->arg.open_seqid);
5459out_release_lock_seqid:
5460 nfs_release_seqid(data->arg.lock_seqid);
5461out_wait:
5462 nfs4_sequence_done(task, &data->res.seq_res);
5463 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5464}
5465
5466static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5467{
5468 struct nfs4_lockdata *data = calldata;
5469
5470 dprintk("%s: begin!\n", __func__);
5471
5472 if (!nfs4_sequence_done(task, &data->res.seq_res))
5473 return;
5474
5475 data->rpc_status = task->tk_status;
5476 if (data->arg.new_lock_owner != 0) {
5477 if (data->rpc_status == 0)
5478 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5479 else
5480 goto out;
5481 }
5482 if (data->rpc_status == 0) {
5483 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5484 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5485 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5486 }
5487out:
5488 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5489}
5490
5491static void nfs4_lock_release(void *calldata)
5492{
5493 struct nfs4_lockdata *data = calldata;
5494
5495 dprintk("%s: begin!\n", __func__);
5496 nfs_free_seqid(data->arg.open_seqid);
5497 if (data->cancelled != 0) {
5498 struct rpc_task *task;
5499 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5500 data->arg.lock_seqid);
5501 if (!IS_ERR(task))
5502 rpc_put_task_async(task);
5503 dprintk("%s: cancelling lock!\n", __func__);
5504 } else
5505 nfs_free_seqid(data->arg.lock_seqid);
5506 nfs4_put_lock_state(data->lsp);
5507 put_nfs_open_context(data->ctx);
5508 kfree(data);
5509 dprintk("%s: done!\n", __func__);
5510}
5511
5512static const struct rpc_call_ops nfs4_lock_ops = {
5513 .rpc_call_prepare = nfs4_lock_prepare,
5514 .rpc_call_done = nfs4_lock_done,
5515 .rpc_release = nfs4_lock_release,
5516};
5517
5518static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5519{
5520 switch (error) {
5521 case -NFS4ERR_ADMIN_REVOKED:
5522 case -NFS4ERR_BAD_STATEID:
5523 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5524 if (new_lock_owner != 0 ||
5525 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5526 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5527 break;
5528 case -NFS4ERR_STALE_STATEID:
5529 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5530 case -NFS4ERR_EXPIRED:
5531 nfs4_schedule_lease_recovery(server->nfs_client);
5532 };
5533}
5534
5535static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5536{
5537 struct nfs4_lockdata *data;
5538 struct rpc_task *task;
5539 struct rpc_message msg = {
5540 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5541 .rpc_cred = state->owner->so_cred,
5542 };
5543 struct rpc_task_setup task_setup_data = {
5544 .rpc_client = NFS_CLIENT(state->inode),
5545 .rpc_message = &msg,
5546 .callback_ops = &nfs4_lock_ops,
5547 .workqueue = nfsiod_workqueue,
5548 .flags = RPC_TASK_ASYNC,
5549 };
5550 int ret;
5551
5552 dprintk("%s: begin!\n", __func__);
5553 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5554 fl->fl_u.nfs4_fl.owner,
5555 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5556 if (data == NULL)
5557 return -ENOMEM;
5558 if (IS_SETLKW(cmd))
5559 data->arg.block = 1;
5560 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5561 msg.rpc_argp = &data->arg;
5562 msg.rpc_resp = &data->res;
5563 task_setup_data.callback_data = data;
5564 if (recovery_type > NFS_LOCK_NEW) {
5565 if (recovery_type == NFS_LOCK_RECLAIM)
5566 data->arg.reclaim = NFS_LOCK_RECLAIM;
5567 nfs4_set_sequence_privileged(&data->arg.seq_args);
5568 }
5569 task = rpc_run_task(&task_setup_data);
5570 if (IS_ERR(task))
5571 return PTR_ERR(task);
5572 ret = nfs4_wait_for_completion_rpc_task(task);
5573 if (ret == 0) {
5574 ret = data->rpc_status;
5575 if (ret)
5576 nfs4_handle_setlk_error(data->server, data->lsp,
5577 data->arg.new_lock_owner, ret);
5578 } else
5579 data->cancelled = 1;
5580 rpc_put_task(task);
5581 dprintk("%s: done, ret = %d!\n", __func__, ret);
5582 return ret;
5583}
5584
5585static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5586{
5587 struct nfs_server *server = NFS_SERVER(state->inode);
5588 struct nfs4_exception exception = {
5589 .inode = state->inode,
5590 };
5591 int err;
5592
5593 do {
5594 /* Cache the lock if possible... */
5595 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5596 return 0;
5597 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5598 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5599 if (err != -NFS4ERR_DELAY)
5600 break;
5601 nfs4_handle_exception(server, err, &exception);
5602 } while (exception.retry);
5603 return err;
5604}
5605
5606static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5607{
5608 struct nfs_server *server = NFS_SERVER(state->inode);
5609 struct nfs4_exception exception = {
5610 .inode = state->inode,
5611 };
5612 int err;
5613
5614 err = nfs4_set_lock_state(state, request);
5615 if (err != 0)
5616 return err;
5617 if (!recover_lost_locks) {
5618 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5619 return 0;
5620 }
5621 do {
5622 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5623 return 0;
5624 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5625 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5626 switch (err) {
5627 default:
5628 goto out;
5629 case -NFS4ERR_GRACE:
5630 case -NFS4ERR_DELAY:
5631 nfs4_handle_exception(server, err, &exception);
5632 err = 0;
5633 }
5634 } while (exception.retry);
5635out:
5636 return err;
5637}
5638
5639#if defined(CONFIG_NFS_V4_1)
5640/**
5641 * nfs41_check_expired_locks - possibly free a lock stateid
5642 *
5643 * @state: NFSv4 state for an inode
5644 *
5645 * Returns NFS_OK if recovery for this stateid is now finished.
5646 * Otherwise a negative NFS4ERR value is returned.
5647 */
5648static int nfs41_check_expired_locks(struct nfs4_state *state)
5649{
5650 int status, ret = -NFS4ERR_BAD_STATEID;
5651 struct nfs4_lock_state *lsp;
5652 struct nfs_server *server = NFS_SERVER(state->inode);
5653
5654 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5655 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5656 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5657
5658 status = nfs41_test_stateid(server,
5659 &lsp->ls_stateid,
5660 cred);
5661 trace_nfs4_test_lock_stateid(state, lsp, status);
5662 if (status != NFS_OK) {
5663 /* Free the stateid unless the server
5664 * informs us the stateid is unrecognized. */
5665 if (status != -NFS4ERR_BAD_STATEID)
5666 nfs41_free_stateid(server,
5667 &lsp->ls_stateid,
5668 cred);
5669 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5670 ret = status;
5671 }
5672 }
5673 };
5674
5675 return ret;
5676}
5677
5678static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5679{
5680 int status = NFS_OK;
5681
5682 if (test_bit(LK_STATE_IN_USE, &state->flags))
5683 status = nfs41_check_expired_locks(state);
5684 if (status != NFS_OK)
5685 status = nfs4_lock_expired(state, request);
5686 return status;
5687}
5688#endif
5689
5690static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5691{
5692 struct nfs4_state_owner *sp = state->owner;
5693 struct nfs_inode *nfsi = NFS_I(state->inode);
5694 unsigned char fl_flags = request->fl_flags;
5695 unsigned int seq;
5696 int status = -ENOLCK;
5697
5698 if ((fl_flags & FL_POSIX) &&
5699 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5700 goto out;
5701 /* Is this a delegated open? */
5702 status = nfs4_set_lock_state(state, request);
5703 if (status != 0)
5704 goto out;
5705 request->fl_flags |= FL_ACCESS;
5706 status = do_vfs_lock(request->fl_file, request);
5707 if (status < 0)
5708 goto out;
5709 down_read(&nfsi->rwsem);
5710 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5711 /* Yes: cache locks! */
5712 /* ...but avoid races with delegation recall... */
5713 request->fl_flags = fl_flags & ~FL_SLEEP;
5714 status = do_vfs_lock(request->fl_file, request);
5715 goto out_unlock;
5716 }
5717 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5718 up_read(&nfsi->rwsem);
5719 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5720 if (status != 0)
5721 goto out;
5722 down_read(&nfsi->rwsem);
5723 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5724 status = -NFS4ERR_DELAY;
5725 goto out_unlock;
5726 }
5727 /* Note: we always want to sleep here! */
5728 request->fl_flags = fl_flags | FL_SLEEP;
5729 if (do_vfs_lock(request->fl_file, request) < 0)
5730 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5731 "manager!\n", __func__);
5732out_unlock:
5733 up_read(&nfsi->rwsem);
5734out:
5735 request->fl_flags = fl_flags;
5736 return status;
5737}
5738
5739static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5740{
5741 struct nfs4_exception exception = {
5742 .state = state,
5743 .inode = state->inode,
5744 };
5745 int err;
5746
5747 do {
5748 err = _nfs4_proc_setlk(state, cmd, request);
5749 trace_nfs4_set_lock(request, state, cmd, err);
5750 if (err == -NFS4ERR_DENIED)
5751 err = -EAGAIN;
5752 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5753 err, &exception);
5754 } while (exception.retry);
5755 return err;
5756}
5757
5758static int
5759nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5760{
5761 struct nfs_open_context *ctx;
5762 struct nfs4_state *state;
5763 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5764 int status;
5765
5766 /* verify open state */
5767 ctx = nfs_file_open_context(filp);
5768 state = ctx->state;
5769
5770 if (request->fl_start < 0 || request->fl_end < 0)
5771 return -EINVAL;
5772
5773 if (IS_GETLK(cmd)) {
5774 if (state != NULL)
5775 return nfs4_proc_getlk(state, F_GETLK, request);
5776 return 0;
5777 }
5778
5779 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5780 return -EINVAL;
5781
5782 if (request->fl_type == F_UNLCK) {
5783 if (state != NULL)
5784 return nfs4_proc_unlck(state, cmd, request);
5785 return 0;
5786 }
5787
5788 if (state == NULL)
5789 return -ENOLCK;
5790 /*
5791 * Don't rely on the VFS having checked the file open mode,
5792 * since it won't do this for flock() locks.
5793 */
5794 switch (request->fl_type) {
5795 case F_RDLCK:
5796 if (!(filp->f_mode & FMODE_READ))
5797 return -EBADF;
5798 break;
5799 case F_WRLCK:
5800 if (!(filp->f_mode & FMODE_WRITE))
5801 return -EBADF;
5802 }
5803
5804 do {
5805 status = nfs4_proc_setlk(state, cmd, request);
5806 if ((status != -EAGAIN) || IS_SETLK(cmd))
5807 break;
5808 timeout = nfs4_set_lock_task_retry(timeout);
5809 status = -ERESTARTSYS;
5810 if (signalled())
5811 break;
5812 } while(status < 0);
5813 return status;
5814}
5815
5816int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5817{
5818 struct nfs_server *server = NFS_SERVER(state->inode);
5819 int err;
5820
5821 err = nfs4_set_lock_state(state, fl);
5822 if (err != 0)
5823 return err;
5824 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5825 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5826}
5827
5828struct nfs_release_lockowner_data {
5829 struct nfs4_lock_state *lsp;
5830 struct nfs_server *server;
5831 struct nfs_release_lockowner_args args;
5832 struct nfs_release_lockowner_res res;
5833 unsigned long timestamp;
5834};
5835
5836static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5837{
5838 struct nfs_release_lockowner_data *data = calldata;
5839 nfs40_setup_sequence(data->server,
5840 &data->args.seq_args, &data->res.seq_res, task);
5841 data->timestamp = jiffies;
5842}
5843
5844static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5845{
5846 struct nfs_release_lockowner_data *data = calldata;
5847 struct nfs_server *server = data->server;
5848
5849 nfs40_sequence_done(task, &data->res.seq_res);
5850
5851 switch (task->tk_status) {
5852 case 0:
5853 renew_lease(server, data->timestamp);
5854 break;
5855 case -NFS4ERR_STALE_CLIENTID:
5856 case -NFS4ERR_EXPIRED:
5857 case -NFS4ERR_LEASE_MOVED:
5858 case -NFS4ERR_DELAY:
5859 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5860 rpc_restart_call_prepare(task);
5861 }
5862}
5863
5864static void nfs4_release_lockowner_release(void *calldata)
5865{
5866 struct nfs_release_lockowner_data *data = calldata;
5867 nfs4_free_lock_state(data->server, data->lsp);
5868 kfree(calldata);
5869}
5870
5871static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5872 .rpc_call_prepare = nfs4_release_lockowner_prepare,
5873 .rpc_call_done = nfs4_release_lockowner_done,
5874 .rpc_release = nfs4_release_lockowner_release,
5875};
5876
5877static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5878{
5879 struct nfs_release_lockowner_data *data;
5880 struct rpc_message msg = {
5881 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5882 };
5883
5884 if (server->nfs_client->cl_mvops->minor_version != 0)
5885 return -EINVAL;
5886
5887 data = kmalloc(sizeof(*data), GFP_NOFS);
5888 if (!data)
5889 return -ENOMEM;
5890 data->lsp = lsp;
5891 data->server = server;
5892 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5893 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5894 data->args.lock_owner.s_dev = server->s_dev;
5895
5896 msg.rpc_argp = &data->args;
5897 msg.rpc_resp = &data->res;
5898 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
5899 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5900 return 0;
5901}
5902
5903#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5904
5905static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5906 const void *buf, size_t buflen,
5907 int flags, int type)
5908{
5909 if (strcmp(key, "") != 0)
5910 return -EINVAL;
5911
5912 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5913}
5914
5915static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5916 void *buf, size_t buflen, int type)
5917{
5918 if (strcmp(key, "") != 0)
5919 return -EINVAL;
5920
5921 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5922}
5923
5924static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5925 size_t list_len, const char *name,
5926 size_t name_len, int type)
5927{
5928 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5929
5930 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5931 return 0;
5932
5933 if (list && len <= list_len)
5934 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5935 return len;
5936}
5937
5938#ifdef CONFIG_NFS_V4_SECURITY_LABEL
5939static inline int nfs4_server_supports_labels(struct nfs_server *server)
5940{
5941 return server->caps & NFS_CAP_SECURITY_LABEL;
5942}
5943
5944static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5945 const void *buf, size_t buflen,
5946 int flags, int type)
5947{
5948 if (security_ismaclabel(key))
5949 return nfs4_set_security_label(dentry, buf, buflen);
5950
5951 return -EOPNOTSUPP;
5952}
5953
5954static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5955 void *buf, size_t buflen, int type)
5956{
5957 if (security_ismaclabel(key))
5958 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5959 return -EOPNOTSUPP;
5960}
5961
5962static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5963 size_t list_len, const char *name,
5964 size_t name_len, int type)
5965{
5966 size_t len = 0;
5967
5968 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5969 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5970 if (list && len <= list_len)
5971 security_inode_listsecurity(dentry->d_inode, list, len);
5972 }
5973 return len;
5974}
5975
5976static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5977 .prefix = XATTR_SECURITY_PREFIX,
5978 .list = nfs4_xattr_list_nfs4_label,
5979 .get = nfs4_xattr_get_nfs4_label,
5980 .set = nfs4_xattr_set_nfs4_label,
5981};
5982#endif
5983
5984
5985/*
5986 * nfs_fhget will use either the mounted_on_fileid or the fileid
5987 */
5988static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5989{
5990 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5991 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5992 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5993 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5994 return;
5995
5996 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5997 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5998 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5999 fattr->nlink = 2;
6000}
6001
6002static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6003 const struct qstr *name,
6004 struct nfs4_fs_locations *fs_locations,
6005 struct page *page)
6006{
6007 struct nfs_server *server = NFS_SERVER(dir);
6008 u32 bitmask[3] = {
6009 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6010 };
6011 struct nfs4_fs_locations_arg args = {
6012 .dir_fh = NFS_FH(dir),
6013 .name = name,
6014 .page = page,
6015 .bitmask = bitmask,
6016 };
6017 struct nfs4_fs_locations_res res = {
6018 .fs_locations = fs_locations,
6019 };
6020 struct rpc_message msg = {
6021 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6022 .rpc_argp = &args,
6023 .rpc_resp = &res,
6024 };
6025 int status;
6026
6027 dprintk("%s: start\n", __func__);
6028
6029 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6030 * is not supported */
6031 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6032 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6033 else
6034 bitmask[0] |= FATTR4_WORD0_FILEID;
6035
6036 nfs_fattr_init(&fs_locations->fattr);
6037 fs_locations->server = server;
6038 fs_locations->nlocations = 0;
6039 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6040 dprintk("%s: returned status = %d\n", __func__, status);
6041 return status;
6042}
6043
6044int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6045 const struct qstr *name,
6046 struct nfs4_fs_locations *fs_locations,
6047 struct page *page)
6048{
6049 struct nfs4_exception exception = { };
6050 int err;
6051 do {
6052 err = _nfs4_proc_fs_locations(client, dir, name,
6053 fs_locations, page);
6054 trace_nfs4_get_fs_locations(dir, name, err);
6055 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6056 &exception);
6057 } while (exception.retry);
6058 return err;
6059}
6060
6061/*
6062 * This operation also signals the server that this client is
6063 * performing migration recovery. The server can stop returning
6064 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6065 * appended to this compound to identify the client ID which is
6066 * performing recovery.
6067 */
6068static int _nfs40_proc_get_locations(struct inode *inode,
6069 struct nfs4_fs_locations *locations,
6070 struct page *page, struct rpc_cred *cred)
6071{
6072 struct nfs_server *server = NFS_SERVER(inode);
6073 struct rpc_clnt *clnt = server->client;
6074 u32 bitmask[2] = {
6075 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6076 };
6077 struct nfs4_fs_locations_arg args = {
6078 .clientid = server->nfs_client->cl_clientid,
6079 .fh = NFS_FH(inode),
6080 .page = page,
6081 .bitmask = bitmask,
6082 .migration = 1, /* skip LOOKUP */
6083 .renew = 1, /* append RENEW */
6084 };
6085 struct nfs4_fs_locations_res res = {
6086 .fs_locations = locations,
6087 .migration = 1,
6088 .renew = 1,
6089 };
6090 struct rpc_message msg = {
6091 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6092 .rpc_argp = &args,
6093 .rpc_resp = &res,
6094 .rpc_cred = cred,
6095 };
6096 unsigned long now = jiffies;
6097 int status;
6098
6099 nfs_fattr_init(&locations->fattr);
6100 locations->server = server;
6101 locations->nlocations = 0;
6102
6103 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6104 nfs4_set_sequence_privileged(&args.seq_args);
6105 status = nfs4_call_sync_sequence(clnt, server, &msg,
6106 &args.seq_args, &res.seq_res);
6107 if (status)
6108 return status;
6109
6110 renew_lease(server, now);
6111 return 0;
6112}
6113
6114#ifdef CONFIG_NFS_V4_1
6115
6116/*
6117 * This operation also signals the server that this client is
6118 * performing migration recovery. The server can stop asserting
6119 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6120 * performing this operation is identified in the SEQUENCE
6121 * operation in this compound.
6122 *
6123 * When the client supports GETATTR(fs_locations_info), it can
6124 * be plumbed in here.
6125 */
6126static int _nfs41_proc_get_locations(struct inode *inode,
6127 struct nfs4_fs_locations *locations,
6128 struct page *page, struct rpc_cred *cred)
6129{
6130 struct nfs_server *server = NFS_SERVER(inode);
6131 struct rpc_clnt *clnt = server->client;
6132 u32 bitmask[2] = {
6133 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6134 };
6135 struct nfs4_fs_locations_arg args = {
6136 .fh = NFS_FH(inode),
6137 .page = page,
6138 .bitmask = bitmask,
6139 .migration = 1, /* skip LOOKUP */
6140 };
6141 struct nfs4_fs_locations_res res = {
6142 .fs_locations = locations,
6143 .migration = 1,
6144 };
6145 struct rpc_message msg = {
6146 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6147 .rpc_argp = &args,
6148 .rpc_resp = &res,
6149 .rpc_cred = cred,
6150 };
6151 int status;
6152
6153 nfs_fattr_init(&locations->fattr);
6154 locations->server = server;
6155 locations->nlocations = 0;
6156
6157 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6158 nfs4_set_sequence_privileged(&args.seq_args);
6159 status = nfs4_call_sync_sequence(clnt, server, &msg,
6160 &args.seq_args, &res.seq_res);
6161 if (status == NFS4_OK &&
6162 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6163 status = -NFS4ERR_LEASE_MOVED;
6164 return status;
6165}
6166
6167#endif /* CONFIG_NFS_V4_1 */
6168
6169/**
6170 * nfs4_proc_get_locations - discover locations for a migrated FSID
6171 * @inode: inode on FSID that is migrating
6172 * @locations: result of query
6173 * @page: buffer
6174 * @cred: credential to use for this operation
6175 *
6176 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6177 * operation failed, or a negative errno if a local error occurred.
6178 *
6179 * On success, "locations" is filled in, but if the server has
6180 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6181 * asserted.
6182 *
6183 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6184 * from this client that require migration recovery.
6185 */
6186int nfs4_proc_get_locations(struct inode *inode,
6187 struct nfs4_fs_locations *locations,
6188 struct page *page, struct rpc_cred *cred)
6189{
6190 struct nfs_server *server = NFS_SERVER(inode);
6191 struct nfs_client *clp = server->nfs_client;
6192 const struct nfs4_mig_recovery_ops *ops =
6193 clp->cl_mvops->mig_recovery_ops;
6194 struct nfs4_exception exception = { };
6195 int status;
6196
6197 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6198 (unsigned long long)server->fsid.major,
6199 (unsigned long long)server->fsid.minor,
6200 clp->cl_hostname);
6201 nfs_display_fhandle(NFS_FH(inode), __func__);
6202
6203 do {
6204 status = ops->get_locations(inode, locations, page, cred);
6205 if (status != -NFS4ERR_DELAY)
6206 break;
6207 nfs4_handle_exception(server, status, &exception);
6208 } while (exception.retry);
6209 return status;
6210}
6211
6212/*
6213 * This operation also signals the server that this client is
6214 * performing "lease moved" recovery. The server can stop
6215 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6216 * is appended to this compound to identify the client ID which is
6217 * performing recovery.
6218 */
6219static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6220{
6221 struct nfs_server *server = NFS_SERVER(inode);
6222 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6223 struct rpc_clnt *clnt = server->client;
6224 struct nfs4_fsid_present_arg args = {
6225 .fh = NFS_FH(inode),
6226 .clientid = clp->cl_clientid,
6227 .renew = 1, /* append RENEW */
6228 };
6229 struct nfs4_fsid_present_res res = {
6230 .renew = 1,
6231 };
6232 struct rpc_message msg = {
6233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6234 .rpc_argp = &args,
6235 .rpc_resp = &res,
6236 .rpc_cred = cred,
6237 };
6238 unsigned long now = jiffies;
6239 int status;
6240
6241 res.fh = nfs_alloc_fhandle();
6242 if (res.fh == NULL)
6243 return -ENOMEM;
6244
6245 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6246 nfs4_set_sequence_privileged(&args.seq_args);
6247 status = nfs4_call_sync_sequence(clnt, server, &msg,
6248 &args.seq_args, &res.seq_res);
6249 nfs_free_fhandle(res.fh);
6250 if (status)
6251 return status;
6252
6253 do_renew_lease(clp, now);
6254 return 0;
6255}
6256
6257#ifdef CONFIG_NFS_V4_1
6258
6259/*
6260 * This operation also signals the server that this client is
6261 * performing "lease moved" recovery. The server can stop asserting
6262 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6263 * this operation is identified in the SEQUENCE operation in this
6264 * compound.
6265 */
6266static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6267{
6268 struct nfs_server *server = NFS_SERVER(inode);
6269 struct rpc_clnt *clnt = server->client;
6270 struct nfs4_fsid_present_arg args = {
6271 .fh = NFS_FH(inode),
6272 };
6273 struct nfs4_fsid_present_res res = {
6274 };
6275 struct rpc_message msg = {
6276 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6277 .rpc_argp = &args,
6278 .rpc_resp = &res,
6279 .rpc_cred = cred,
6280 };
6281 int status;
6282
6283 res.fh = nfs_alloc_fhandle();
6284 if (res.fh == NULL)
6285 return -ENOMEM;
6286
6287 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6288 nfs4_set_sequence_privileged(&args.seq_args);
6289 status = nfs4_call_sync_sequence(clnt, server, &msg,
6290 &args.seq_args, &res.seq_res);
6291 nfs_free_fhandle(res.fh);
6292 if (status == NFS4_OK &&
6293 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6294 status = -NFS4ERR_LEASE_MOVED;
6295 return status;
6296}
6297
6298#endif /* CONFIG_NFS_V4_1 */
6299
6300/**
6301 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6302 * @inode: inode on FSID to check
6303 * @cred: credential to use for this operation
6304 *
6305 * Server indicates whether the FSID is present, moved, or not
6306 * recognized. This operation is necessary to clear a LEASE_MOVED
6307 * condition for this client ID.
6308 *
6309 * Returns NFS4_OK if the FSID is present on this server,
6310 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6311 * NFS4ERR code if some error occurred on the server, or a
6312 * negative errno if a local failure occurred.
6313 */
6314int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6315{
6316 struct nfs_server *server = NFS_SERVER(inode);
6317 struct nfs_client *clp = server->nfs_client;
6318 const struct nfs4_mig_recovery_ops *ops =
6319 clp->cl_mvops->mig_recovery_ops;
6320 struct nfs4_exception exception = { };
6321 int status;
6322
6323 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6324 (unsigned long long)server->fsid.major,
6325 (unsigned long long)server->fsid.minor,
6326 clp->cl_hostname);
6327 nfs_display_fhandle(NFS_FH(inode), __func__);
6328
6329 do {
6330 status = ops->fsid_present(inode, cred);
6331 if (status != -NFS4ERR_DELAY)
6332 break;
6333 nfs4_handle_exception(server, status, &exception);
6334 } while (exception.retry);
6335 return status;
6336}
6337
6338/**
6339 * If 'use_integrity' is true and the state managment nfs_client
6340 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6341 * and the machine credential as per RFC3530bis and RFC5661 Security
6342 * Considerations sections. Otherwise, just use the user cred with the
6343 * filesystem's rpc_client.
6344 */
6345static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6346{
6347 int status;
6348 struct nfs4_secinfo_arg args = {
6349 .dir_fh = NFS_FH(dir),
6350 .name = name,
6351 };
6352 struct nfs4_secinfo_res res = {
6353 .flavors = flavors,
6354 };
6355 struct rpc_message msg = {
6356 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6357 .rpc_argp = &args,
6358 .rpc_resp = &res,
6359 };
6360 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6361 struct rpc_cred *cred = NULL;
6362
6363 if (use_integrity) {
6364 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6365 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6366 msg.rpc_cred = cred;
6367 }
6368
6369 dprintk("NFS call secinfo %s\n", name->name);
6370
6371 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6372 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6373
6374 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6375 &res.seq_res, 0);
6376 dprintk("NFS reply secinfo: %d\n", status);
6377
6378 if (cred)
6379 put_rpccred(cred);
6380
6381 return status;
6382}
6383
6384int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6385 struct nfs4_secinfo_flavors *flavors)
6386{
6387 struct nfs4_exception exception = { };
6388 int err;
6389 do {
6390 err = -NFS4ERR_WRONGSEC;
6391
6392 /* try to use integrity protection with machine cred */
6393 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6394 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6395
6396 /*
6397 * if unable to use integrity protection, or SECINFO with
6398 * integrity protection returns NFS4ERR_WRONGSEC (which is
6399 * disallowed by spec, but exists in deployed servers) use
6400 * the current filesystem's rpc_client and the user cred.
6401 */
6402 if (err == -NFS4ERR_WRONGSEC)
6403 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6404
6405 trace_nfs4_secinfo(dir, name, err);
6406 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6407 &exception);
6408 } while (exception.retry);
6409 return err;
6410}
6411
6412#ifdef CONFIG_NFS_V4_1
6413/*
6414 * Check the exchange flags returned by the server for invalid flags, having
6415 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6416 * DS flags set.
6417 */
6418static int nfs4_check_cl_exchange_flags(u32 flags)
6419{
6420 if (flags & ~EXCHGID4_FLAG_MASK_R)
6421 goto out_inval;
6422 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6423 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6424 goto out_inval;
6425 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6426 goto out_inval;
6427 return NFS_OK;
6428out_inval:
6429 return -NFS4ERR_INVAL;
6430}
6431
6432static bool
6433nfs41_same_server_scope(struct nfs41_server_scope *a,
6434 struct nfs41_server_scope *b)
6435{
6436 if (a->server_scope_sz == b->server_scope_sz &&
6437 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6438 return true;
6439
6440 return false;
6441}
6442
6443/*
6444 * nfs4_proc_bind_conn_to_session()
6445 *
6446 * The 4.1 client currently uses the same TCP connection for the
6447 * fore and backchannel.
6448 */
6449int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6450{
6451 int status;
6452 struct nfs41_bind_conn_to_session_res res;
6453 struct rpc_message msg = {
6454 .rpc_proc =
6455 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6456 .rpc_argp = clp,
6457 .rpc_resp = &res,
6458 .rpc_cred = cred,
6459 };
6460
6461 dprintk("--> %s\n", __func__);
6462
6463 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6464 if (unlikely(res.session == NULL)) {
6465 status = -ENOMEM;
6466 goto out;
6467 }
6468
6469 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6470 trace_nfs4_bind_conn_to_session(clp, status);
6471 if (status == 0) {
6472 if (memcmp(res.session->sess_id.data,
6473 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6474 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6475 status = -EIO;
6476 goto out_session;
6477 }
6478 if (res.dir != NFS4_CDFS4_BOTH) {
6479 dprintk("NFS: %s: Unexpected direction from server\n",
6480 __func__);
6481 status = -EIO;
6482 goto out_session;
6483 }
6484 if (res.use_conn_in_rdma_mode) {
6485 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6486 __func__);
6487 status = -EIO;
6488 goto out_session;
6489 }
6490 }
6491out_session:
6492 kfree(res.session);
6493out:
6494 dprintk("<-- %s status= %d\n", __func__, status);
6495 return status;
6496}
6497
6498/*
6499 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6500 * and operations we'd like to see to enable certain features in the allow map
6501 */
6502static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6503 .how = SP4_MACH_CRED,
6504 .enforce.u.words = {
6505 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6506 1 << (OP_EXCHANGE_ID - 32) |
6507 1 << (OP_CREATE_SESSION - 32) |
6508 1 << (OP_DESTROY_SESSION - 32) |
6509 1 << (OP_DESTROY_CLIENTID - 32)
6510 },
6511 .allow.u.words = {
6512 [0] = 1 << (OP_CLOSE) |
6513 1 << (OP_LOCKU) |
6514 1 << (OP_COMMIT),
6515 [1] = 1 << (OP_SECINFO - 32) |
6516 1 << (OP_SECINFO_NO_NAME - 32) |
6517 1 << (OP_TEST_STATEID - 32) |
6518 1 << (OP_FREE_STATEID - 32) |
6519 1 << (OP_WRITE - 32)
6520 }
6521};
6522
6523/*
6524 * Select the state protection mode for client `clp' given the server results
6525 * from exchange_id in `sp'.
6526 *
6527 * Returns 0 on success, negative errno otherwise.
6528 */
6529static int nfs4_sp4_select_mode(struct nfs_client *clp,
6530 struct nfs41_state_protection *sp)
6531{
6532 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6533 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6534 1 << (OP_EXCHANGE_ID - 32) |
6535 1 << (OP_CREATE_SESSION - 32) |
6536 1 << (OP_DESTROY_SESSION - 32) |
6537 1 << (OP_DESTROY_CLIENTID - 32)
6538 };
6539 unsigned int i;
6540
6541 if (sp->how == SP4_MACH_CRED) {
6542 /* Print state protect result */
6543 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6544 for (i = 0; i <= LAST_NFS4_OP; i++) {
6545 if (test_bit(i, sp->enforce.u.longs))
6546 dfprintk(MOUNT, " enforce op %d\n", i);
6547 if (test_bit(i, sp->allow.u.longs))
6548 dfprintk(MOUNT, " allow op %d\n", i);
6549 }
6550
6551 /* make sure nothing is on enforce list that isn't supported */
6552 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6553 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6554 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6555 return -EINVAL;
6556 }
6557 }
6558
6559 /*
6560 * Minimal mode - state operations are allowed to use machine
6561 * credential. Note this already happens by default, so the
6562 * client doesn't have to do anything more than the negotiation.
6563 *
6564 * NOTE: we don't care if EXCHANGE_ID is in the list -
6565 * we're already using the machine cred for exchange_id
6566 * and will never use a different cred.
6567 */
6568 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6569 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6570 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6571 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6572 dfprintk(MOUNT, "sp4_mach_cred:\n");
6573 dfprintk(MOUNT, " minimal mode enabled\n");
6574 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6575 } else {
6576 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6577 return -EINVAL;
6578 }
6579
6580 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6581 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6582 dfprintk(MOUNT, " cleanup mode enabled\n");
6583 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6584 }
6585
6586 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6587 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6588 dfprintk(MOUNT, " secinfo mode enabled\n");
6589 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6590 }
6591
6592 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6593 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6594 dfprintk(MOUNT, " stateid mode enabled\n");
6595 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6596 }
6597
6598 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6599 dfprintk(MOUNT, " write mode enabled\n");
6600 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6601 }
6602
6603 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6604 dfprintk(MOUNT, " commit mode enabled\n");
6605 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6606 }
6607 }
6608
6609 return 0;
6610}
6611
6612/*
6613 * _nfs4_proc_exchange_id()
6614 *
6615 * Wrapper for EXCHANGE_ID operation.
6616 */
6617static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6618 u32 sp4_how)
6619{
6620 nfs4_verifier verifier;
6621 struct nfs41_exchange_id_args args = {
6622 .verifier = &verifier,
6623 .client = clp,
6624#ifdef CONFIG_NFS_V4_1_MIGRATION
6625 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6626 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6627 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6628#else
6629 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6630 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6631#endif
6632 };
6633 struct nfs41_exchange_id_res res = {
6634 0
6635 };
6636 int status;
6637 struct rpc_message msg = {
6638 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6639 .rpc_argp = &args,
6640 .rpc_resp = &res,
6641 .rpc_cred = cred,
6642 };
6643
6644 nfs4_init_boot_verifier(clp, &verifier);
6645 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6646 sizeof(args.id));
6647 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6648 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6649 args.id_len, args.id);
6650
6651 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6652 GFP_NOFS);
6653 if (unlikely(res.server_owner == NULL)) {
6654 status = -ENOMEM;
6655 goto out;
6656 }
6657
6658 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6659 GFP_NOFS);
6660 if (unlikely(res.server_scope == NULL)) {
6661 status = -ENOMEM;
6662 goto out_server_owner;
6663 }
6664
6665 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6666 if (unlikely(res.impl_id == NULL)) {
6667 status = -ENOMEM;
6668 goto out_server_scope;
6669 }
6670
6671 switch (sp4_how) {
6672 case SP4_NONE:
6673 args.state_protect.how = SP4_NONE;
6674 break;
6675
6676 case SP4_MACH_CRED:
6677 args.state_protect = nfs4_sp4_mach_cred_request;
6678 break;
6679
6680 default:
6681 /* unsupported! */
6682 WARN_ON_ONCE(1);
6683 status = -EINVAL;
6684 goto out_server_scope;
6685 }
6686
6687 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6688 trace_nfs4_exchange_id(clp, status);
6689 if (status == 0)
6690 status = nfs4_check_cl_exchange_flags(res.flags);
6691
6692 if (status == 0)
6693 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6694
6695 if (status == 0) {
6696 clp->cl_clientid = res.clientid;
6697 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6698 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6699 clp->cl_seqid = res.seqid;
6700
6701 kfree(clp->cl_serverowner);
6702 clp->cl_serverowner = res.server_owner;
6703 res.server_owner = NULL;
6704
6705 /* use the most recent implementation id */
6706 kfree(clp->cl_implid);
6707 clp->cl_implid = res.impl_id;
6708
6709 if (clp->cl_serverscope != NULL &&
6710 !nfs41_same_server_scope(clp->cl_serverscope,
6711 res.server_scope)) {
6712 dprintk("%s: server_scope mismatch detected\n",
6713 __func__);
6714 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6715 kfree(clp->cl_serverscope);
6716 clp->cl_serverscope = NULL;
6717 }
6718
6719 if (clp->cl_serverscope == NULL) {
6720 clp->cl_serverscope = res.server_scope;
6721 goto out;
6722 }
6723 } else
6724 kfree(res.impl_id);
6725
6726out_server_owner:
6727 kfree(res.server_owner);
6728out_server_scope:
6729 kfree(res.server_scope);
6730out:
6731 if (clp->cl_implid != NULL)
6732 dprintk("NFS reply exchange_id: Server Implementation ID: "
6733 "domain: %s, name: %s, date: %llu,%u\n",
6734 clp->cl_implid->domain, clp->cl_implid->name,
6735 clp->cl_implid->date.seconds,
6736 clp->cl_implid->date.nseconds);
6737 dprintk("NFS reply exchange_id: %d\n", status);
6738 return status;
6739}
6740
6741/*
6742 * nfs4_proc_exchange_id()
6743 *
6744 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6745 *
6746 * Since the clientid has expired, all compounds using sessions
6747 * associated with the stale clientid will be returning
6748 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6749 * be in some phase of session reset.
6750 *
6751 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6752 */
6753int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6754{
6755 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6756 int status;
6757
6758 /* try SP4_MACH_CRED if krb5i/p */
6759 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6760 authflavor == RPC_AUTH_GSS_KRB5P) {
6761 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6762 if (!status)
6763 return 0;
6764 }
6765
6766 /* try SP4_NONE */
6767 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6768}
6769
6770static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6771 struct rpc_cred *cred)
6772{
6773 struct rpc_message msg = {
6774 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6775 .rpc_argp = clp,
6776 .rpc_cred = cred,
6777 };
6778 int status;
6779
6780 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6781 trace_nfs4_destroy_clientid(clp, status);
6782 if (status)
6783 dprintk("NFS: Got error %d from the server %s on "
6784 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6785 return status;
6786}
6787
6788static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6789 struct rpc_cred *cred)
6790{
6791 unsigned int loop;
6792 int ret;
6793
6794 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6795 ret = _nfs4_proc_destroy_clientid(clp, cred);
6796 switch (ret) {
6797 case -NFS4ERR_DELAY:
6798 case -NFS4ERR_CLIENTID_BUSY:
6799 ssleep(1);
6800 break;
6801 default:
6802 return ret;
6803 }
6804 }
6805 return 0;
6806}
6807
6808int nfs4_destroy_clientid(struct nfs_client *clp)
6809{
6810 struct rpc_cred *cred;
6811 int ret = 0;
6812
6813 if (clp->cl_mvops->minor_version < 1)
6814 goto out;
6815 if (clp->cl_exchange_flags == 0)
6816 goto out;
6817 if (clp->cl_preserve_clid)
6818 goto out;
6819 cred = nfs4_get_clid_cred(clp);
6820 ret = nfs4_proc_destroy_clientid(clp, cred);
6821 if (cred)
6822 put_rpccred(cred);
6823 switch (ret) {
6824 case 0:
6825 case -NFS4ERR_STALE_CLIENTID:
6826 clp->cl_exchange_flags = 0;
6827 }
6828out:
6829 return ret;
6830}
6831
6832struct nfs4_get_lease_time_data {
6833 struct nfs4_get_lease_time_args *args;
6834 struct nfs4_get_lease_time_res *res;
6835 struct nfs_client *clp;
6836};
6837
6838static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6839 void *calldata)
6840{
6841 struct nfs4_get_lease_time_data *data =
6842 (struct nfs4_get_lease_time_data *)calldata;
6843
6844 dprintk("--> %s\n", __func__);
6845 /* just setup sequence, do not trigger session recovery
6846 since we're invoked within one */
6847 nfs41_setup_sequence(data->clp->cl_session,
6848 &data->args->la_seq_args,
6849 &data->res->lr_seq_res,
6850 task);
6851 dprintk("<-- %s\n", __func__);
6852}
6853
6854/*
6855 * Called from nfs4_state_manager thread for session setup, so don't recover
6856 * from sequence operation or clientid errors.
6857 */
6858static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6859{
6860 struct nfs4_get_lease_time_data *data =
6861 (struct nfs4_get_lease_time_data *)calldata;
6862
6863 dprintk("--> %s\n", __func__);
6864 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6865 return;
6866 switch (task->tk_status) {
6867 case -NFS4ERR_DELAY:
6868 case -NFS4ERR_GRACE:
6869 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6870 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6871 task->tk_status = 0;
6872 /* fall through */
6873 case -NFS4ERR_RETRY_UNCACHED_REP:
6874 rpc_restart_call_prepare(task);
6875 return;
6876 }
6877 dprintk("<-- %s\n", __func__);
6878}
6879
6880static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6881 .rpc_call_prepare = nfs4_get_lease_time_prepare,
6882 .rpc_call_done = nfs4_get_lease_time_done,
6883};
6884
6885int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6886{
6887 struct rpc_task *task;
6888 struct nfs4_get_lease_time_args args;
6889 struct nfs4_get_lease_time_res res = {
6890 .lr_fsinfo = fsinfo,
6891 };
6892 struct nfs4_get_lease_time_data data = {
6893 .args = &args,
6894 .res = &res,
6895 .clp = clp,
6896 };
6897 struct rpc_message msg = {
6898 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6899 .rpc_argp = &args,
6900 .rpc_resp = &res,
6901 };
6902 struct rpc_task_setup task_setup = {
6903 .rpc_client = clp->cl_rpcclient,
6904 .rpc_message = &msg,
6905 .callback_ops = &nfs4_get_lease_time_ops,
6906 .callback_data = &data,
6907 .flags = RPC_TASK_TIMEOUT,
6908 };
6909 int status;
6910
6911 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6912 nfs4_set_sequence_privileged(&args.la_seq_args);
6913 dprintk("--> %s\n", __func__);
6914 task = rpc_run_task(&task_setup);
6915
6916 if (IS_ERR(task))
6917 status = PTR_ERR(task);
6918 else {
6919 status = task->tk_status;
6920 rpc_put_task(task);
6921 }
6922 dprintk("<-- %s return %d\n", __func__, status);
6923
6924 return status;
6925}
6926
6927/*
6928 * Initialize the values to be used by the client in CREATE_SESSION
6929 * If nfs4_init_session set the fore channel request and response sizes,
6930 * use them.
6931 *
6932 * Set the back channel max_resp_sz_cached to zero to force the client to
6933 * always set csa_cachethis to FALSE because the current implementation
6934 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6935 */
6936static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6937{
6938 unsigned int max_rqst_sz, max_resp_sz;
6939
6940 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6941 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6942
6943 /* Fore channel attributes */
6944 args->fc_attrs.max_rqst_sz = max_rqst_sz;
6945 args->fc_attrs.max_resp_sz = max_resp_sz;
6946 args->fc_attrs.max_ops = NFS4_MAX_OPS;
6947 args->fc_attrs.max_reqs = max_session_slots;
6948
6949 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6950 "max_ops=%u max_reqs=%u\n",
6951 __func__,
6952 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6953 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6954
6955 /* Back channel attributes */
6956 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6957 args->bc_attrs.max_resp_sz = PAGE_SIZE;
6958 args->bc_attrs.max_resp_sz_cached = 0;
6959 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6960 args->bc_attrs.max_reqs = 1;
6961
6962 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6963 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6964 __func__,
6965 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6966 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6967 args->bc_attrs.max_reqs);
6968}
6969
6970static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6971{
6972 struct nfs4_channel_attrs *sent = &args->fc_attrs;
6973 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6974
6975 if (rcvd->max_resp_sz > sent->max_resp_sz)
6976 return -EINVAL;
6977 /*
6978 * Our requested max_ops is the minimum we need; we're not
6979 * prepared to break up compounds into smaller pieces than that.
6980 * So, no point even trying to continue if the server won't
6981 * cooperate:
6982 */
6983 if (rcvd->max_ops < sent->max_ops)
6984 return -EINVAL;
6985 if (rcvd->max_reqs == 0)
6986 return -EINVAL;
6987 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6988 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6989 return 0;
6990}
6991
6992static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6993{
6994 struct nfs4_channel_attrs *sent = &args->bc_attrs;
6995 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6996
6997 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6998 return -EINVAL;
6999 if (rcvd->max_resp_sz < sent->max_resp_sz)
7000 return -EINVAL;
7001 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7002 return -EINVAL;
7003 /* These would render the backchannel useless: */
7004 if (rcvd->max_ops != sent->max_ops)
7005 return -EINVAL;
7006 if (rcvd->max_reqs != sent->max_reqs)
7007 return -EINVAL;
7008 return 0;
7009}
7010
7011static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7012 struct nfs4_session *session)
7013{
7014 int ret;
7015
7016 ret = nfs4_verify_fore_channel_attrs(args, session);
7017 if (ret)
7018 return ret;
7019 return nfs4_verify_back_channel_attrs(args, session);
7020}
7021
7022static int _nfs4_proc_create_session(struct nfs_client *clp,
7023 struct rpc_cred *cred)
7024{
7025 struct nfs4_session *session = clp->cl_session;
7026 struct nfs41_create_session_args args = {
7027 .client = clp,
7028 .cb_program = NFS4_CALLBACK,
7029 };
7030 struct nfs41_create_session_res res = {
7031 .client = clp,
7032 };
7033 struct rpc_message msg = {
7034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7035 .rpc_argp = &args,
7036 .rpc_resp = &res,
7037 .rpc_cred = cred,
7038 };
7039 int status;
7040
7041 nfs4_init_channel_attrs(&args);
7042 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7043
7044 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7045 trace_nfs4_create_session(clp, status);
7046
7047 if (!status) {
7048 /* Verify the session's negotiated channel_attrs values */
7049 status = nfs4_verify_channel_attrs(&args, session);
7050 /* Increment the clientid slot sequence id */
7051 clp->cl_seqid++;
7052 }
7053
7054 return status;
7055}
7056
7057/*
7058 * Issues a CREATE_SESSION operation to the server.
7059 * It is the responsibility of the caller to verify the session is
7060 * expired before calling this routine.
7061 */
7062int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7063{
7064 int status;
7065 unsigned *ptr;
7066 struct nfs4_session *session = clp->cl_session;
7067
7068 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7069
7070 status = _nfs4_proc_create_session(clp, cred);
7071 if (status)
7072 goto out;
7073
7074 /* Init or reset the session slot tables */
7075 status = nfs4_setup_session_slot_tables(session);
7076 dprintk("slot table setup returned %d\n", status);
7077 if (status)
7078 goto out;
7079
7080 ptr = (unsigned *)&session->sess_id.data[0];
7081 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7082 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7083out:
7084 dprintk("<-- %s\n", __func__);
7085 return status;
7086}
7087
7088/*
7089 * Issue the over-the-wire RPC DESTROY_SESSION.
7090 * The caller must serialize access to this routine.
7091 */
7092int nfs4_proc_destroy_session(struct nfs4_session *session,
7093 struct rpc_cred *cred)
7094{
7095 struct rpc_message msg = {
7096 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7097 .rpc_argp = session,
7098 .rpc_cred = cred,
7099 };
7100 int status = 0;
7101
7102 dprintk("--> nfs4_proc_destroy_session\n");
7103
7104 /* session is still being setup */
7105 if (session->clp->cl_cons_state != NFS_CS_READY)
7106 return status;
7107
7108 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7109 trace_nfs4_destroy_session(session->clp, status);
7110
7111 if (status)
7112 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7113 "Session has been destroyed regardless...\n", status);
7114
7115 dprintk("<-- nfs4_proc_destroy_session\n");
7116 return status;
7117}
7118
7119/*
7120 * Renew the cl_session lease.
7121 */
7122struct nfs4_sequence_data {
7123 struct nfs_client *clp;
7124 struct nfs4_sequence_args args;
7125 struct nfs4_sequence_res res;
7126};
7127
7128static void nfs41_sequence_release(void *data)
7129{
7130 struct nfs4_sequence_data *calldata = data;
7131 struct nfs_client *clp = calldata->clp;
7132
7133 if (atomic_read(&clp->cl_count) > 1)
7134 nfs4_schedule_state_renewal(clp);
7135 nfs_put_client(clp);
7136 kfree(calldata);
7137}
7138
7139static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7140{
7141 switch(task->tk_status) {
7142 case -NFS4ERR_DELAY:
7143 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7144 return -EAGAIN;
7145 default:
7146 nfs4_schedule_lease_recovery(clp);
7147 }
7148 return 0;
7149}
7150
7151static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7152{
7153 struct nfs4_sequence_data *calldata = data;
7154 struct nfs_client *clp = calldata->clp;
7155
7156 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7157 return;
7158
7159 trace_nfs4_sequence(clp, task->tk_status);
7160 if (task->tk_status < 0) {
7161 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7162 if (atomic_read(&clp->cl_count) == 1)
7163 goto out;
7164
7165 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7166 rpc_restart_call_prepare(task);
7167 return;
7168 }
7169 }
7170 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7171out:
7172 dprintk("<-- %s\n", __func__);
7173}
7174
7175static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7176{
7177 struct nfs4_sequence_data *calldata = data;
7178 struct nfs_client *clp = calldata->clp;
7179 struct nfs4_sequence_args *args;
7180 struct nfs4_sequence_res *res;
7181
7182 args = task->tk_msg.rpc_argp;
7183 res = task->tk_msg.rpc_resp;
7184
7185 nfs41_setup_sequence(clp->cl_session, args, res, task);
7186}
7187
7188static const struct rpc_call_ops nfs41_sequence_ops = {
7189 .rpc_call_done = nfs41_sequence_call_done,
7190 .rpc_call_prepare = nfs41_sequence_prepare,
7191 .rpc_release = nfs41_sequence_release,
7192};
7193
7194static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7195 struct rpc_cred *cred,
7196 bool is_privileged)
7197{
7198 struct nfs4_sequence_data *calldata;
7199 struct rpc_message msg = {
7200 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7201 .rpc_cred = cred,
7202 };
7203 struct rpc_task_setup task_setup_data = {
7204 .rpc_client = clp->cl_rpcclient,
7205 .rpc_message = &msg,
7206 .callback_ops = &nfs41_sequence_ops,
7207 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7208 };
7209
7210 if (!atomic_inc_not_zero(&clp->cl_count))
7211 return ERR_PTR(-EIO);
7212 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7213 if (calldata == NULL) {
7214 nfs_put_client(clp);
7215 return ERR_PTR(-ENOMEM);
7216 }
7217 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7218 if (is_privileged)
7219 nfs4_set_sequence_privileged(&calldata->args);
7220 msg.rpc_argp = &calldata->args;
7221 msg.rpc_resp = &calldata->res;
7222 calldata->clp = clp;
7223 task_setup_data.callback_data = calldata;
7224
7225 return rpc_run_task(&task_setup_data);
7226}
7227
7228static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7229{
7230 struct rpc_task *task;
7231 int ret = 0;
7232
7233 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7234 return 0;
7235 task = _nfs41_proc_sequence(clp, cred, false);
7236 if (IS_ERR(task))
7237 ret = PTR_ERR(task);
7238 else
7239 rpc_put_task_async(task);
7240 dprintk("<-- %s status=%d\n", __func__, ret);
7241 return ret;
7242}
7243
7244static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7245{
7246 struct rpc_task *task;
7247 int ret;
7248
7249 task = _nfs41_proc_sequence(clp, cred, true);
7250 if (IS_ERR(task)) {
7251 ret = PTR_ERR(task);
7252 goto out;
7253 }
7254 ret = rpc_wait_for_completion_task(task);
7255 if (!ret) {
7256 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7257
7258 if (task->tk_status == 0)
7259 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7260 ret = task->tk_status;
7261 }
7262 rpc_put_task(task);
7263out:
7264 dprintk("<-- %s status=%d\n", __func__, ret);
7265 return ret;
7266}
7267
7268struct nfs4_reclaim_complete_data {
7269 struct nfs_client *clp;
7270 struct nfs41_reclaim_complete_args arg;
7271 struct nfs41_reclaim_complete_res res;
7272};
7273
7274static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7275{
7276 struct nfs4_reclaim_complete_data *calldata = data;
7277
7278 nfs41_setup_sequence(calldata->clp->cl_session,
7279 &calldata->arg.seq_args,
7280 &calldata->res.seq_res,
7281 task);
7282}
7283
7284static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7285{
7286 switch(task->tk_status) {
7287 case 0:
7288 case -NFS4ERR_COMPLETE_ALREADY:
7289 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7290 break;
7291 case -NFS4ERR_DELAY:
7292 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7293 /* fall through */
7294 case -NFS4ERR_RETRY_UNCACHED_REP:
7295 return -EAGAIN;
7296 default:
7297 nfs4_schedule_lease_recovery(clp);
7298 }
7299 return 0;
7300}
7301
7302static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7303{
7304 struct nfs4_reclaim_complete_data *calldata = data;
7305 struct nfs_client *clp = calldata->clp;
7306 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7307
7308 dprintk("--> %s\n", __func__);
7309 if (!nfs41_sequence_done(task, res))
7310 return;
7311
7312 trace_nfs4_reclaim_complete(clp, task->tk_status);
7313 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7314 rpc_restart_call_prepare(task);
7315 return;
7316 }
7317 dprintk("<-- %s\n", __func__);
7318}
7319
7320static void nfs4_free_reclaim_complete_data(void *data)
7321{
7322 struct nfs4_reclaim_complete_data *calldata = data;
7323
7324 kfree(calldata);
7325}
7326
7327static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7328 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7329 .rpc_call_done = nfs4_reclaim_complete_done,
7330 .rpc_release = nfs4_free_reclaim_complete_data,
7331};
7332
7333/*
7334 * Issue a global reclaim complete.
7335 */
7336static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7337 struct rpc_cred *cred)
7338{
7339 struct nfs4_reclaim_complete_data *calldata;
7340 struct rpc_task *task;
7341 struct rpc_message msg = {
7342 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7343 .rpc_cred = cred,
7344 };
7345 struct rpc_task_setup task_setup_data = {
7346 .rpc_client = clp->cl_rpcclient,
7347 .rpc_message = &msg,
7348 .callback_ops = &nfs4_reclaim_complete_call_ops,
7349 .flags = RPC_TASK_ASYNC,
7350 };
7351 int status = -ENOMEM;
7352
7353 dprintk("--> %s\n", __func__);
7354 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7355 if (calldata == NULL)
7356 goto out;
7357 calldata->clp = clp;
7358 calldata->arg.one_fs = 0;
7359
7360 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7361 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7362 msg.rpc_argp = &calldata->arg;
7363 msg.rpc_resp = &calldata->res;
7364 task_setup_data.callback_data = calldata;
7365 task = rpc_run_task(&task_setup_data);
7366 if (IS_ERR(task)) {
7367 status = PTR_ERR(task);
7368 goto out;
7369 }
7370 status = nfs4_wait_for_completion_rpc_task(task);
7371 if (status == 0)
7372 status = task->tk_status;
7373 rpc_put_task(task);
7374 return 0;
7375out:
7376 dprintk("<-- %s status=%d\n", __func__, status);
7377 return status;
7378}
7379
7380static void
7381nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7382{
7383 struct nfs4_layoutget *lgp = calldata;
7384 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7385 struct nfs4_session *session = nfs4_get_session(server);
7386
7387 dprintk("--> %s\n", __func__);
7388 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7389 * right now covering the LAYOUTGET we are about to send.
7390 * However, that is not so catastrophic, and there seems
7391 * to be no way to prevent it completely.
7392 */
7393 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7394 &lgp->res.seq_res, task))
7395 return;
7396 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7397 NFS_I(lgp->args.inode)->layout,
7398 lgp->args.ctx->state)) {
7399 rpc_exit(task, NFS4_OK);
7400 }
7401}
7402
7403static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7404{
7405 struct nfs4_layoutget *lgp = calldata;
7406 struct inode *inode = lgp->args.inode;
7407 struct nfs_server *server = NFS_SERVER(inode);
7408 struct pnfs_layout_hdr *lo;
7409 struct nfs4_state *state = NULL;
7410 unsigned long timeo, now, giveup;
7411
7412 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7413
7414 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7415 goto out;
7416
7417 switch (task->tk_status) {
7418 case 0:
7419 goto out;
7420 /*
7421 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7422 * (or clients) writing to the same RAID stripe
7423 */
7424 case -NFS4ERR_LAYOUTTRYLATER:
7425 /*
7426 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7427 * existing layout before getting a new one).
7428 */
7429 case -NFS4ERR_RECALLCONFLICT:
7430 timeo = rpc_get_timeout(task->tk_client);
7431 giveup = lgp->args.timestamp + timeo;
7432 now = jiffies;
7433 if (time_after(giveup, now)) {
7434 unsigned long delay;
7435
7436 /* Delay for:
7437 * - Not less then NFS4_POLL_RETRY_MIN.
7438 * - One last time a jiffie before we give up
7439 * - exponential backoff (time_now minus start_attempt)
7440 */
7441 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7442 min((giveup - now - 1),
7443 now - lgp->args.timestamp));
7444
7445 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7446 __func__, delay);
7447 rpc_delay(task, delay);
7448 task->tk_status = 0;
7449 rpc_restart_call_prepare(task);
7450 goto out; /* Do not call nfs4_async_handle_error() */
7451 }
7452 break;
7453 case -NFS4ERR_EXPIRED:
7454 case -NFS4ERR_BAD_STATEID:
7455 spin_lock(&inode->i_lock);
7456 lo = NFS_I(inode)->layout;
7457 if (!lo || list_empty(&lo->plh_segs)) {
7458 spin_unlock(&inode->i_lock);
7459 /* If the open stateid was bad, then recover it. */
7460 state = lgp->args.ctx->state;
7461 } else {
7462 LIST_HEAD(head);
7463
7464 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7465 spin_unlock(&inode->i_lock);
7466 /* Mark the bad layout state as invalid, then
7467 * retry using the open stateid. */
7468 pnfs_free_lseg_list(&head);
7469 }
7470 }
7471 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7472 rpc_restart_call_prepare(task);
7473out:
7474 dprintk("<-- %s\n", __func__);
7475}
7476
7477static size_t max_response_pages(struct nfs_server *server)
7478{
7479 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7480 return nfs_page_array_len(0, max_resp_sz);
7481}
7482
7483static void nfs4_free_pages(struct page **pages, size_t size)
7484{
7485 int i;
7486
7487 if (!pages)
7488 return;
7489
7490 for (i = 0; i < size; i++) {
7491 if (!pages[i])
7492 break;
7493 __free_page(pages[i]);
7494 }
7495 kfree(pages);
7496}
7497
7498static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7499{
7500 struct page **pages;
7501 int i;
7502
7503 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7504 if (!pages) {
7505 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7506 return NULL;
7507 }
7508
7509 for (i = 0; i < size; i++) {
7510 pages[i] = alloc_page(gfp_flags);
7511 if (!pages[i]) {
7512 dprintk("%s: failed to allocate page\n", __func__);
7513 nfs4_free_pages(pages, size);
7514 return NULL;
7515 }
7516 }
7517
7518 return pages;
7519}
7520
7521static void nfs4_layoutget_release(void *calldata)
7522{
7523 struct nfs4_layoutget *lgp = calldata;
7524 struct inode *inode = lgp->args.inode;
7525 struct nfs_server *server = NFS_SERVER(inode);
7526 size_t max_pages = max_response_pages(server);
7527
7528 dprintk("--> %s\n", __func__);
7529 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7530 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7531 put_nfs_open_context(lgp->args.ctx);
7532 kfree(calldata);
7533 dprintk("<-- %s\n", __func__);
7534}
7535
7536static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7537 .rpc_call_prepare = nfs4_layoutget_prepare,
7538 .rpc_call_done = nfs4_layoutget_done,
7539 .rpc_release = nfs4_layoutget_release,
7540};
7541
7542struct pnfs_layout_segment *
7543nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7544{
7545 struct inode *inode = lgp->args.inode;
7546 struct nfs_server *server = NFS_SERVER(inode);
7547 size_t max_pages = max_response_pages(server);
7548 struct rpc_task *task;
7549 struct rpc_message msg = {
7550 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7551 .rpc_argp = &lgp->args,
7552 .rpc_resp = &lgp->res,
7553 .rpc_cred = lgp->cred,
7554 };
7555 struct rpc_task_setup task_setup_data = {
7556 .rpc_client = server->client,
7557 .rpc_message = &msg,
7558 .callback_ops = &nfs4_layoutget_call_ops,
7559 .callback_data = lgp,
7560 .flags = RPC_TASK_ASYNC,
7561 };
7562 struct pnfs_layout_segment *lseg = NULL;
7563 int status = 0;
7564
7565 dprintk("--> %s\n", __func__);
7566
7567 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7568 if (!lgp->args.layout.pages) {
7569 nfs4_layoutget_release(lgp);
7570 return ERR_PTR(-ENOMEM);
7571 }
7572 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7573 lgp->args.timestamp = jiffies;
7574
7575 lgp->res.layoutp = &lgp->args.layout;
7576 lgp->res.seq_res.sr_slot = NULL;
7577 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7578
7579 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7580 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7581
7582 task = rpc_run_task(&task_setup_data);
7583 if (IS_ERR(task))
7584 return ERR_CAST(task);
7585 status = nfs4_wait_for_completion_rpc_task(task);
7586 if (status == 0)
7587 status = task->tk_status;
7588 trace_nfs4_layoutget(lgp->args.ctx,
7589 &lgp->args.range,
7590 &lgp->res.range,
7591 status);
7592 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7593 if (status == 0 && lgp->res.layoutp->len)
7594 lseg = pnfs_layout_process(lgp);
7595 rpc_put_task(task);
7596 dprintk("<-- %s status=%d\n", __func__, status);
7597 if (status)
7598 return ERR_PTR(status);
7599 return lseg;
7600}
7601
7602static void
7603nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7604{
7605 struct nfs4_layoutreturn *lrp = calldata;
7606
7607 dprintk("--> %s\n", __func__);
7608 nfs41_setup_sequence(lrp->clp->cl_session,
7609 &lrp->args.seq_args,
7610 &lrp->res.seq_res,
7611 task);
7612}
7613
7614static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7615{
7616 struct nfs4_layoutreturn *lrp = calldata;
7617 struct nfs_server *server;
7618
7619 dprintk("--> %s\n", __func__);
7620
7621 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7622 return;
7623
7624 server = NFS_SERVER(lrp->args.inode);
7625 switch (task->tk_status) {
7626 default:
7627 task->tk_status = 0;
7628 case 0:
7629 break;
7630 case -NFS4ERR_DELAY:
7631 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
7632 break;
7633 rpc_restart_call_prepare(task);
7634 return;
7635 }
7636 dprintk("<-- %s\n", __func__);
7637}
7638
7639static void nfs4_layoutreturn_release(void *calldata)
7640{
7641 struct nfs4_layoutreturn *lrp = calldata;
7642 struct pnfs_layout_hdr *lo = lrp->args.layout;
7643
7644 dprintk("--> %s\n", __func__);
7645 spin_lock(&lo->plh_inode->i_lock);
7646 if (lrp->res.lrs_present)
7647 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7648 lo->plh_block_lgets--;
7649 spin_unlock(&lo->plh_inode->i_lock);
7650 pnfs_put_layout_hdr(lrp->args.layout);
7651 kfree(calldata);
7652 dprintk("<-- %s\n", __func__);
7653}
7654
7655static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7656 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7657 .rpc_call_done = nfs4_layoutreturn_done,
7658 .rpc_release = nfs4_layoutreturn_release,
7659};
7660
7661int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7662{
7663 struct rpc_task *task;
7664 struct rpc_message msg = {
7665 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7666 .rpc_argp = &lrp->args,
7667 .rpc_resp = &lrp->res,
7668 .rpc_cred = lrp->cred,
7669 };
7670 struct rpc_task_setup task_setup_data = {
7671 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7672 .rpc_message = &msg,
7673 .callback_ops = &nfs4_layoutreturn_call_ops,
7674 .callback_data = lrp,
7675 };
7676 int status;
7677
7678 dprintk("--> %s\n", __func__);
7679 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7680 task = rpc_run_task(&task_setup_data);
7681 if (IS_ERR(task))
7682 return PTR_ERR(task);
7683 status = task->tk_status;
7684 trace_nfs4_layoutreturn(lrp->args.inode, status);
7685 dprintk("<-- %s status=%d\n", __func__, status);
7686 rpc_put_task(task);
7687 return status;
7688}
7689
7690/*
7691 * Retrieve the list of Data Server devices from the MDS.
7692 */
7693static int _nfs4_getdevicelist(struct nfs_server *server,
7694 const struct nfs_fh *fh,
7695 struct pnfs_devicelist *devlist)
7696{
7697 struct nfs4_getdevicelist_args args = {
7698 .fh = fh,
7699 .layoutclass = server->pnfs_curr_ld->id,
7700 };
7701 struct nfs4_getdevicelist_res res = {
7702 .devlist = devlist,
7703 };
7704 struct rpc_message msg = {
7705 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7706 .rpc_argp = &args,
7707 .rpc_resp = &res,
7708 };
7709 int status;
7710
7711 dprintk("--> %s\n", __func__);
7712 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7713 &res.seq_res, 0);
7714 dprintk("<-- %s status=%d\n", __func__, status);
7715 return status;
7716}
7717
7718int nfs4_proc_getdevicelist(struct nfs_server *server,
7719 const struct nfs_fh *fh,
7720 struct pnfs_devicelist *devlist)
7721{
7722 struct nfs4_exception exception = { };
7723 int err;
7724
7725 do {
7726 err = nfs4_handle_exception(server,
7727 _nfs4_getdevicelist(server, fh, devlist),
7728 &exception);
7729 } while (exception.retry);
7730
7731 dprintk("%s: err=%d, num_devs=%u\n", __func__,
7732 err, devlist->num_devs);
7733
7734 return err;
7735}
7736EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7737
7738static int
7739_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7740 struct pnfs_device *pdev,
7741 struct rpc_cred *cred)
7742{
7743 struct nfs4_getdeviceinfo_args args = {
7744 .pdev = pdev,
7745 };
7746 struct nfs4_getdeviceinfo_res res = {
7747 .pdev = pdev,
7748 };
7749 struct rpc_message msg = {
7750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7751 .rpc_argp = &args,
7752 .rpc_resp = &res,
7753 .rpc_cred = cred,
7754 };
7755 int status;
7756
7757 dprintk("--> %s\n", __func__);
7758 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7759 dprintk("<-- %s status=%d\n", __func__, status);
7760
7761 return status;
7762}
7763
7764int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7765 struct pnfs_device *pdev,
7766 struct rpc_cred *cred)
7767{
7768 struct nfs4_exception exception = { };
7769 int err;
7770
7771 do {
7772 err = nfs4_handle_exception(server,
7773 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7774 &exception);
7775 } while (exception.retry);
7776 return err;
7777}
7778EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7779
7780static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7781{
7782 struct nfs4_layoutcommit_data *data = calldata;
7783 struct nfs_server *server = NFS_SERVER(data->args.inode);
7784 struct nfs4_session *session = nfs4_get_session(server);
7785
7786 nfs41_setup_sequence(session,
7787 &data->args.seq_args,
7788 &data->res.seq_res,
7789 task);
7790}
7791
7792static void
7793nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7794{
7795 struct nfs4_layoutcommit_data *data = calldata;
7796 struct nfs_server *server = NFS_SERVER(data->args.inode);
7797
7798 if (!nfs41_sequence_done(task, &data->res.seq_res))
7799 return;
7800
7801 switch (task->tk_status) { /* Just ignore these failures */
7802 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7803 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7804 case -NFS4ERR_BADLAYOUT: /* no layout */
7805 case -NFS4ERR_GRACE: /* loca_recalim always false */
7806 task->tk_status = 0;
7807 case 0:
7808 break;
7809 default:
7810 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7811 rpc_restart_call_prepare(task);
7812 return;
7813 }
7814 }
7815}
7816
7817static void nfs4_layoutcommit_release(void *calldata)
7818{
7819 struct nfs4_layoutcommit_data *data = calldata;
7820
7821 pnfs_cleanup_layoutcommit(data);
7822 nfs_post_op_update_inode_force_wcc(data->args.inode,
7823 data->res.fattr);
7824 put_rpccred(data->cred);
7825 kfree(data);
7826}
7827
7828static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7829 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7830 .rpc_call_done = nfs4_layoutcommit_done,
7831 .rpc_release = nfs4_layoutcommit_release,
7832};
7833
7834int
7835nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7836{
7837 struct rpc_message msg = {
7838 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7839 .rpc_argp = &data->args,
7840 .rpc_resp = &data->res,
7841 .rpc_cred = data->cred,
7842 };
7843 struct rpc_task_setup task_setup_data = {
7844 .task = &data->task,
7845 .rpc_client = NFS_CLIENT(data->args.inode),
7846 .rpc_message = &msg,
7847 .callback_ops = &nfs4_layoutcommit_ops,
7848 .callback_data = data,
7849 .flags = RPC_TASK_ASYNC,
7850 };
7851 struct rpc_task *task;
7852 int status = 0;
7853
7854 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7855 "lbw: %llu inode %lu\n",
7856 data->task.tk_pid, sync,
7857 data->args.lastbytewritten,
7858 data->args.inode->i_ino);
7859
7860 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7861 task = rpc_run_task(&task_setup_data);
7862 if (IS_ERR(task))
7863 return PTR_ERR(task);
7864 if (sync == false)
7865 goto out;
7866 status = nfs4_wait_for_completion_rpc_task(task);
7867 if (status != 0)
7868 goto out;
7869 status = task->tk_status;
7870 trace_nfs4_layoutcommit(data->args.inode, status);
7871out:
7872 dprintk("%s: status %d\n", __func__, status);
7873 rpc_put_task(task);
7874 return status;
7875}
7876
7877/**
7878 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7879 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7880 */
7881static int
7882_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7883 struct nfs_fsinfo *info,
7884 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7885{
7886 struct nfs41_secinfo_no_name_args args = {
7887 .style = SECINFO_STYLE_CURRENT_FH,
7888 };
7889 struct nfs4_secinfo_res res = {
7890 .flavors = flavors,
7891 };
7892 struct rpc_message msg = {
7893 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7894 .rpc_argp = &args,
7895 .rpc_resp = &res,
7896 };
7897 struct rpc_clnt *clnt = server->client;
7898 struct rpc_cred *cred = NULL;
7899 int status;
7900
7901 if (use_integrity) {
7902 clnt = server->nfs_client->cl_rpcclient;
7903 cred = nfs4_get_clid_cred(server->nfs_client);
7904 msg.rpc_cred = cred;
7905 }
7906
7907 dprintk("--> %s\n", __func__);
7908 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7909 &res.seq_res, 0);
7910 dprintk("<-- %s status=%d\n", __func__, status);
7911
7912 if (cred)
7913 put_rpccred(cred);
7914
7915 return status;
7916}
7917
7918static int
7919nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7920 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7921{
7922 struct nfs4_exception exception = { };
7923 int err;
7924 do {
7925 /* first try using integrity protection */
7926 err = -NFS4ERR_WRONGSEC;
7927
7928 /* try to use integrity protection with machine cred */
7929 if (_nfs4_is_integrity_protected(server->nfs_client))
7930 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7931 flavors, true);
7932
7933 /*
7934 * if unable to use integrity protection, or SECINFO with
7935 * integrity protection returns NFS4ERR_WRONGSEC (which is
7936 * disallowed by spec, but exists in deployed servers) use
7937 * the current filesystem's rpc_client and the user cred.
7938 */
7939 if (err == -NFS4ERR_WRONGSEC)
7940 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7941 flavors, false);
7942
7943 switch (err) {
7944 case 0:
7945 case -NFS4ERR_WRONGSEC:
7946 case -ENOTSUPP:
7947 goto out;
7948 default:
7949 err = nfs4_handle_exception(server, err, &exception);
7950 }
7951 } while (exception.retry);
7952out:
7953 return err;
7954}
7955
7956static int
7957nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7958 struct nfs_fsinfo *info)
7959{
7960 int err;
7961 struct page *page;
7962 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7963 struct nfs4_secinfo_flavors *flavors;
7964 struct nfs4_secinfo4 *secinfo;
7965 int i;
7966
7967 page = alloc_page(GFP_KERNEL);
7968 if (!page) {
7969 err = -ENOMEM;
7970 goto out;
7971 }
7972
7973 flavors = page_address(page);
7974 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7975
7976 /*
7977 * Fall back on "guess and check" method if
7978 * the server doesn't support SECINFO_NO_NAME
7979 */
7980 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
7981 err = nfs4_find_root_sec(server, fhandle, info);
7982 goto out_freepage;
7983 }
7984 if (err)
7985 goto out_freepage;
7986
7987 for (i = 0; i < flavors->num_flavors; i++) {
7988 secinfo = &flavors->flavors[i];
7989
7990 switch (secinfo->flavor) {
7991 case RPC_AUTH_NULL:
7992 case RPC_AUTH_UNIX:
7993 case RPC_AUTH_GSS:
7994 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
7995 &secinfo->flavor_info);
7996 break;
7997 default:
7998 flavor = RPC_AUTH_MAXFLAVOR;
7999 break;
8000 }
8001
8002 if (!nfs_auth_info_match(&server->auth_info, flavor))
8003 flavor = RPC_AUTH_MAXFLAVOR;
8004
8005 if (flavor != RPC_AUTH_MAXFLAVOR) {
8006 err = nfs4_lookup_root_sec(server, fhandle,
8007 info, flavor);
8008 if (!err)
8009 break;
8010 }
8011 }
8012
8013 if (flavor == RPC_AUTH_MAXFLAVOR)
8014 err = -EPERM;
8015
8016out_freepage:
8017 put_page(page);
8018 if (err == -EACCES)
8019 return -EPERM;
8020out:
8021 return err;
8022}
8023
8024static int _nfs41_test_stateid(struct nfs_server *server,
8025 nfs4_stateid *stateid,
8026 struct rpc_cred *cred)
8027{
8028 int status;
8029 struct nfs41_test_stateid_args args = {
8030 .stateid = stateid,
8031 };
8032 struct nfs41_test_stateid_res res;
8033 struct rpc_message msg = {
8034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8035 .rpc_argp = &args,
8036 .rpc_resp = &res,
8037 .rpc_cred = cred,
8038 };
8039 struct rpc_clnt *rpc_client = server->client;
8040
8041 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8042 &rpc_client, &msg);
8043
8044 dprintk("NFS call test_stateid %p\n", stateid);
8045 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8046 nfs4_set_sequence_privileged(&args.seq_args);
8047 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8048 &args.seq_args, &res.seq_res);
8049 if (status != NFS_OK) {
8050 dprintk("NFS reply test_stateid: failed, %d\n", status);
8051 return status;
8052 }
8053 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8054 return -res.status;
8055}
8056
8057/**
8058 * nfs41_test_stateid - perform a TEST_STATEID operation
8059 *
8060 * @server: server / transport on which to perform the operation
8061 * @stateid: state ID to test
8062 * @cred: credential
8063 *
8064 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8065 * Otherwise a negative NFS4ERR value is returned if the operation
8066 * failed or the state ID is not currently valid.
8067 */
8068static int nfs41_test_stateid(struct nfs_server *server,
8069 nfs4_stateid *stateid,
8070 struct rpc_cred *cred)
8071{
8072 struct nfs4_exception exception = { };
8073 int err;
8074 do {
8075 err = _nfs41_test_stateid(server, stateid, cred);
8076 if (err != -NFS4ERR_DELAY)
8077 break;
8078 nfs4_handle_exception(server, err, &exception);
8079 } while (exception.retry);
8080 return err;
8081}
8082
8083struct nfs_free_stateid_data {
8084 struct nfs_server *server;
8085 struct nfs41_free_stateid_args args;
8086 struct nfs41_free_stateid_res res;
8087};
8088
8089static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8090{
8091 struct nfs_free_stateid_data *data = calldata;
8092 nfs41_setup_sequence(nfs4_get_session(data->server),
8093 &data->args.seq_args,
8094 &data->res.seq_res,
8095 task);
8096}
8097
8098static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8099{
8100 struct nfs_free_stateid_data *data = calldata;
8101
8102 nfs41_sequence_done(task, &data->res.seq_res);
8103
8104 switch (task->tk_status) {
8105 case -NFS4ERR_DELAY:
8106 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8107 rpc_restart_call_prepare(task);
8108 }
8109}
8110
8111static void nfs41_free_stateid_release(void *calldata)
8112{
8113 kfree(calldata);
8114}
8115
8116static const struct rpc_call_ops nfs41_free_stateid_ops = {
8117 .rpc_call_prepare = nfs41_free_stateid_prepare,
8118 .rpc_call_done = nfs41_free_stateid_done,
8119 .rpc_release = nfs41_free_stateid_release,
8120};
8121
8122static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8123 nfs4_stateid *stateid,
8124 struct rpc_cred *cred,
8125 bool privileged)
8126{
8127 struct rpc_message msg = {
8128 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8129 .rpc_cred = cred,
8130 };
8131 struct rpc_task_setup task_setup = {
8132 .rpc_client = server->client,
8133 .rpc_message = &msg,
8134 .callback_ops = &nfs41_free_stateid_ops,
8135 .flags = RPC_TASK_ASYNC,
8136 };
8137 struct nfs_free_stateid_data *data;
8138
8139 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8140 &task_setup.rpc_client, &msg);
8141
8142 dprintk("NFS call free_stateid %p\n", stateid);
8143 data = kmalloc(sizeof(*data), GFP_NOFS);
8144 if (!data)
8145 return ERR_PTR(-ENOMEM);
8146 data->server = server;
8147 nfs4_stateid_copy(&data->args.stateid, stateid);
8148
8149 task_setup.callback_data = data;
8150
8151 msg.rpc_argp = &data->args;
8152 msg.rpc_resp = &data->res;
8153 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8154 if (privileged)
8155 nfs4_set_sequence_privileged(&data->args.seq_args);
8156
8157 return rpc_run_task(&task_setup);
8158}
8159
8160/**
8161 * nfs41_free_stateid - perform a FREE_STATEID operation
8162 *
8163 * @server: server / transport on which to perform the operation
8164 * @stateid: state ID to release
8165 * @cred: credential
8166 *
8167 * Returns NFS_OK if the server freed "stateid". Otherwise a
8168 * negative NFS4ERR value is returned.
8169 */
8170static int nfs41_free_stateid(struct nfs_server *server,
8171 nfs4_stateid *stateid,
8172 struct rpc_cred *cred)
8173{
8174 struct rpc_task *task;
8175 int ret;
8176
8177 task = _nfs41_free_stateid(server, stateid, cred, true);
8178 if (IS_ERR(task))
8179 return PTR_ERR(task);
8180 ret = rpc_wait_for_completion_task(task);
8181 if (!ret)
8182 ret = task->tk_status;
8183 rpc_put_task(task);
8184 return ret;
8185}
8186
8187static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8188{
8189 struct rpc_task *task;
8190 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8191
8192 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8193 nfs4_free_lock_state(server, lsp);
8194 if (IS_ERR(task))
8195 return PTR_ERR(task);
8196 rpc_put_task(task);
8197 return 0;
8198}
8199
8200static bool nfs41_match_stateid(const nfs4_stateid *s1,
8201 const nfs4_stateid *s2)
8202{
8203 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8204 return false;
8205
8206 if (s1->seqid == s2->seqid)
8207 return true;
8208 if (s1->seqid == 0 || s2->seqid == 0)
8209 return true;
8210
8211 return false;
8212}
8213
8214#endif /* CONFIG_NFS_V4_1 */
8215
8216static bool nfs4_match_stateid(const nfs4_stateid *s1,
8217 const nfs4_stateid *s2)
8218{
8219 return nfs4_stateid_match(s1, s2);
8220}
8221
8222
8223static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8224 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8225 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8226 .recover_open = nfs4_open_reclaim,
8227 .recover_lock = nfs4_lock_reclaim,
8228 .establish_clid = nfs4_init_clientid,
8229 .detect_trunking = nfs40_discover_server_trunking,
8230};
8231
8232#if defined(CONFIG_NFS_V4_1)
8233static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8234 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8235 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8236 .recover_open = nfs4_open_reclaim,
8237 .recover_lock = nfs4_lock_reclaim,
8238 .establish_clid = nfs41_init_clientid,
8239 .reclaim_complete = nfs41_proc_reclaim_complete,
8240 .detect_trunking = nfs41_discover_server_trunking,
8241};
8242#endif /* CONFIG_NFS_V4_1 */
8243
8244static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8245 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8246 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8247 .recover_open = nfs4_open_expired,
8248 .recover_lock = nfs4_lock_expired,
8249 .establish_clid = nfs4_init_clientid,
8250};
8251
8252#if defined(CONFIG_NFS_V4_1)
8253static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8254 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8255 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8256 .recover_open = nfs41_open_expired,
8257 .recover_lock = nfs41_lock_expired,
8258 .establish_clid = nfs41_init_clientid,
8259};
8260#endif /* CONFIG_NFS_V4_1 */
8261
8262static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8263 .sched_state_renewal = nfs4_proc_async_renew,
8264 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8265 .renew_lease = nfs4_proc_renew,
8266};
8267
8268#if defined(CONFIG_NFS_V4_1)
8269static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8270 .sched_state_renewal = nfs41_proc_async_sequence,
8271 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8272 .renew_lease = nfs4_proc_sequence,
8273};
8274#endif
8275
8276static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8277 .get_locations = _nfs40_proc_get_locations,
8278 .fsid_present = _nfs40_proc_fsid_present,
8279};
8280
8281#if defined(CONFIG_NFS_V4_1)
8282static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8283 .get_locations = _nfs41_proc_get_locations,
8284 .fsid_present = _nfs41_proc_fsid_present,
8285};
8286#endif /* CONFIG_NFS_V4_1 */
8287
8288static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8289 .minor_version = 0,
8290 .init_caps = NFS_CAP_READDIRPLUS
8291 | NFS_CAP_ATOMIC_OPEN
8292 | NFS_CAP_CHANGE_ATTR
8293 | NFS_CAP_POSIX_LOCK,
8294 .init_client = nfs40_init_client,
8295 .shutdown_client = nfs40_shutdown_client,
8296 .match_stateid = nfs4_match_stateid,
8297 .find_root_sec = nfs4_find_root_sec,
8298 .free_lock_state = nfs4_release_lockowner,
8299 .call_sync_ops = &nfs40_call_sync_ops,
8300 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8301 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8302 .state_renewal_ops = &nfs40_state_renewal_ops,
8303 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8304};
8305
8306#if defined(CONFIG_NFS_V4_1)
8307static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8308 .minor_version = 1,
8309 .init_caps = NFS_CAP_READDIRPLUS
8310 | NFS_CAP_ATOMIC_OPEN
8311 | NFS_CAP_CHANGE_ATTR
8312 | NFS_CAP_POSIX_LOCK
8313 | NFS_CAP_STATEID_NFSV41
8314 | NFS_CAP_ATOMIC_OPEN_V1,
8315 .init_client = nfs41_init_client,
8316 .shutdown_client = nfs41_shutdown_client,
8317 .match_stateid = nfs41_match_stateid,
8318 .find_root_sec = nfs41_find_root_sec,
8319 .free_lock_state = nfs41_free_lock_state,
8320 .call_sync_ops = &nfs41_call_sync_ops,
8321 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8322 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8323 .state_renewal_ops = &nfs41_state_renewal_ops,
8324 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8325};
8326#endif
8327
8328#if defined(CONFIG_NFS_V4_2)
8329static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8330 .minor_version = 2,
8331 .init_caps = NFS_CAP_READDIRPLUS
8332 | NFS_CAP_ATOMIC_OPEN
8333 | NFS_CAP_CHANGE_ATTR
8334 | NFS_CAP_POSIX_LOCK
8335 | NFS_CAP_STATEID_NFSV41
8336 | NFS_CAP_ATOMIC_OPEN_V1,
8337 .init_client = nfs41_init_client,
8338 .shutdown_client = nfs41_shutdown_client,
8339 .match_stateid = nfs41_match_stateid,
8340 .find_root_sec = nfs41_find_root_sec,
8341 .free_lock_state = nfs41_free_lock_state,
8342 .call_sync_ops = &nfs41_call_sync_ops,
8343 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8344 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8345 .state_renewal_ops = &nfs41_state_renewal_ops,
8346};
8347#endif
8348
8349const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8350 [0] = &nfs_v4_0_minor_ops,
8351#if defined(CONFIG_NFS_V4_1)
8352 [1] = &nfs_v4_1_minor_ops,
8353#endif
8354#if defined(CONFIG_NFS_V4_2)
8355 [2] = &nfs_v4_2_minor_ops,
8356#endif
8357};
8358
8359static const struct inode_operations nfs4_dir_inode_operations = {
8360 .create = nfs_create,
8361 .lookup = nfs_lookup,
8362 .atomic_open = nfs_atomic_open,
8363 .link = nfs_link,
8364 .unlink = nfs_unlink,
8365 .symlink = nfs_symlink,
8366 .mkdir = nfs_mkdir,
8367 .rmdir = nfs_rmdir,
8368 .mknod = nfs_mknod,
8369 .rename = nfs_rename,
8370 .permission = nfs_permission,
8371 .getattr = nfs_getattr,
8372 .setattr = nfs_setattr,
8373 .getxattr = generic_getxattr,
8374 .setxattr = generic_setxattr,
8375 .listxattr = generic_listxattr,
8376 .removexattr = generic_removexattr,
8377};
8378
8379static const struct inode_operations nfs4_file_inode_operations = {
8380 .permission = nfs_permission,
8381 .getattr = nfs_getattr,
8382 .setattr = nfs_setattr,
8383 .getxattr = generic_getxattr,
8384 .setxattr = generic_setxattr,
8385 .listxattr = generic_listxattr,
8386 .removexattr = generic_removexattr,
8387};
8388
8389const struct nfs_rpc_ops nfs_v4_clientops = {
8390 .version = 4, /* protocol version */
8391 .dentry_ops = &nfs4_dentry_operations,
8392 .dir_inode_ops = &nfs4_dir_inode_operations,
8393 .file_inode_ops = &nfs4_file_inode_operations,
8394 .file_ops = &nfs4_file_operations,
8395 .getroot = nfs4_proc_get_root,
8396 .submount = nfs4_submount,
8397 .try_mount = nfs4_try_mount,
8398 .getattr = nfs4_proc_getattr,
8399 .setattr = nfs4_proc_setattr,
8400 .lookup = nfs4_proc_lookup,
8401 .access = nfs4_proc_access,
8402 .readlink = nfs4_proc_readlink,
8403 .create = nfs4_proc_create,
8404 .remove = nfs4_proc_remove,
8405 .unlink_setup = nfs4_proc_unlink_setup,
8406 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8407 .unlink_done = nfs4_proc_unlink_done,
8408 .rename = nfs4_proc_rename,
8409 .rename_setup = nfs4_proc_rename_setup,
8410 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8411 .rename_done = nfs4_proc_rename_done,
8412 .link = nfs4_proc_link,
8413 .symlink = nfs4_proc_symlink,
8414 .mkdir = nfs4_proc_mkdir,
8415 .rmdir = nfs4_proc_remove,
8416 .readdir = nfs4_proc_readdir,
8417 .mknod = nfs4_proc_mknod,
8418 .statfs = nfs4_proc_statfs,
8419 .fsinfo = nfs4_proc_fsinfo,
8420 .pathconf = nfs4_proc_pathconf,
8421 .set_capabilities = nfs4_server_capabilities,
8422 .decode_dirent = nfs4_decode_dirent,
8423 .read_setup = nfs4_proc_read_setup,
8424 .read_pageio_init = pnfs_pageio_init_read,
8425 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8426 .read_done = nfs4_read_done,
8427 .write_setup = nfs4_proc_write_setup,
8428 .write_pageio_init = pnfs_pageio_init_write,
8429 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8430 .write_done = nfs4_write_done,
8431 .commit_setup = nfs4_proc_commit_setup,
8432 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8433 .commit_done = nfs4_commit_done,
8434 .lock = nfs4_proc_lock,
8435 .clear_acl_cache = nfs4_zap_acl_attr,
8436 .close_context = nfs4_close_context,
8437 .open_context = nfs4_atomic_open,
8438 .have_delegation = nfs4_have_delegation,
8439 .return_delegation = nfs4_inode_return_delegation,
8440 .alloc_client = nfs4_alloc_client,
8441 .init_client = nfs4_init_client,
8442 .free_client = nfs4_free_client,
8443 .create_server = nfs4_create_server,
8444 .clone_server = nfs_clone_server,
8445};
8446
8447static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8448 .prefix = XATTR_NAME_NFSV4_ACL,
8449 .list = nfs4_xattr_list_nfs4_acl,
8450 .get = nfs4_xattr_get_nfs4_acl,
8451 .set = nfs4_xattr_set_nfs4_acl,
8452};
8453
8454const struct xattr_handler *nfs4_xattr_handlers[] = {
8455 &nfs4_xattr_nfs4_acl_handler,
8456#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8457 &nfs4_xattr_nfs4_label_handler,
8458#endif
8459 NULL
8460};
8461
8462/*
8463 * Local variables:
8464 * c-basic-offset: 8
8465 * End:
8466 */
Linux 6.x block layer and io_uring tree(s)