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NFS: Create a common rw_header_alloc and rw_header_free function
[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->f_attr.mdsthreshold);
1072 kfree(p);
1073}
1074
1075static void nfs4_opendata_put(struct nfs4_opendata *p)
1076{
1077 if (p != NULL)
1078 kref_put(&p->kref, nfs4_opendata_free);
1079}
1080
1081static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1082{
1083 int ret;
1084
1085 ret = rpc_wait_for_completion_task(task);
1086 return ret;
1087}
1088
1089static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1090{
1091 int ret = 0;
1092
1093 if (open_mode & (O_EXCL|O_TRUNC))
1094 goto out;
1095 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1096 case FMODE_READ:
1097 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1098 && state->n_rdonly != 0;
1099 break;
1100 case FMODE_WRITE:
1101 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1102 && state->n_wronly != 0;
1103 break;
1104 case FMODE_READ|FMODE_WRITE:
1105 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1106 && state->n_rdwr != 0;
1107 }
1108out:
1109 return ret;
1110}
1111
1112static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1113{
1114 if (delegation == NULL)
1115 return 0;
1116 if ((delegation->type & fmode) != fmode)
1117 return 0;
1118 if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1119 return 0;
1120 if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1121 return 0;
1122 nfs_mark_delegation_referenced(delegation);
1123 return 1;
1124}
1125
1126static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1127{
1128 switch (fmode) {
1129 case FMODE_WRITE:
1130 state->n_wronly++;
1131 break;
1132 case FMODE_READ:
1133 state->n_rdonly++;
1134 break;
1135 case FMODE_READ|FMODE_WRITE:
1136 state->n_rdwr++;
1137 }
1138 nfs4_state_set_mode_locked(state, state->state | fmode);
1139}
1140
1141static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1142{
1143 struct nfs_client *clp = state->owner->so_server->nfs_client;
1144 bool need_recover = false;
1145
1146 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1147 need_recover = true;
1148 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1149 need_recover = true;
1150 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1151 need_recover = true;
1152 if (need_recover)
1153 nfs4_state_mark_reclaim_nograce(clp, state);
1154}
1155
1156static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1157 nfs4_stateid *stateid)
1158{
1159 if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1160 return true;
1161 if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1162 nfs_test_and_clear_all_open_stateid(state);
1163 return true;
1164 }
1165 if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1166 return true;
1167 return false;
1168}
1169
1170static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1171 nfs4_stateid *stateid, fmode_t fmode)
1172{
1173 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1174 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1175 case FMODE_WRITE:
1176 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1177 break;
1178 case FMODE_READ:
1179 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180 break;
1181 case 0:
1182 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1183 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1184 clear_bit(NFS_OPEN_STATE, &state->flags);
1185 }
1186 if (stateid == NULL)
1187 return;
1188 if (!nfs_need_update_open_stateid(state, stateid))
1189 return;
1190 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1191 nfs4_stateid_copy(&state->stateid, stateid);
1192 nfs4_stateid_copy(&state->open_stateid, stateid);
1193}
1194
1195static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1196{
1197 write_seqlock(&state->seqlock);
1198 nfs_clear_open_stateid_locked(state, stateid, fmode);
1199 write_sequnlock(&state->seqlock);
1200 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1201 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1202}
1203
1204static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205{
1206 switch (fmode) {
1207 case FMODE_READ:
1208 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1209 break;
1210 case FMODE_WRITE:
1211 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1212 break;
1213 case FMODE_READ|FMODE_WRITE:
1214 set_bit(NFS_O_RDWR_STATE, &state->flags);
1215 }
1216 if (!nfs_need_update_open_stateid(state, stateid))
1217 return;
1218 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1219 nfs4_stateid_copy(&state->stateid, stateid);
1220 nfs4_stateid_copy(&state->open_stateid, stateid);
1221}
1222
1223static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1224{
1225 /*
1226 * Protect the call to nfs4_state_set_mode_locked and
1227 * serialise the stateid update
1228 */
1229 write_seqlock(&state->seqlock);
1230 if (deleg_stateid != NULL) {
1231 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1232 set_bit(NFS_DELEGATED_STATE, &state->flags);
1233 }
1234 if (open_stateid != NULL)
1235 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1236 write_sequnlock(&state->seqlock);
1237 spin_lock(&state->owner->so_lock);
1238 update_open_stateflags(state, fmode);
1239 spin_unlock(&state->owner->so_lock);
1240}
1241
1242static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1243{
1244 struct nfs_inode *nfsi = NFS_I(state->inode);
1245 struct nfs_delegation *deleg_cur;
1246 int ret = 0;
1247
1248 fmode &= (FMODE_READ|FMODE_WRITE);
1249
1250 rcu_read_lock();
1251 deleg_cur = rcu_dereference(nfsi->delegation);
1252 if (deleg_cur == NULL)
1253 goto no_delegation;
1254
1255 spin_lock(&deleg_cur->lock);
1256 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1257 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1258 (deleg_cur->type & fmode) != fmode)
1259 goto no_delegation_unlock;
1260
1261 if (delegation == NULL)
1262 delegation = &deleg_cur->stateid;
1263 else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1264 goto no_delegation_unlock;
1265
1266 nfs_mark_delegation_referenced(deleg_cur);
1267 __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1268 ret = 1;
1269no_delegation_unlock:
1270 spin_unlock(&deleg_cur->lock);
1271no_delegation:
1272 rcu_read_unlock();
1273
1274 if (!ret && open_stateid != NULL) {
1275 __update_open_stateid(state, open_stateid, NULL, fmode);
1276 ret = 1;
1277 }
1278 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1279 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1280
1281 return ret;
1282}
1283
1284
1285static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1286{
1287 struct nfs_delegation *delegation;
1288
1289 rcu_read_lock();
1290 delegation = rcu_dereference(NFS_I(inode)->delegation);
1291 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1292 rcu_read_unlock();
1293 return;
1294 }
1295 rcu_read_unlock();
1296 nfs4_inode_return_delegation(inode);
1297}
1298
1299static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1300{
1301 struct nfs4_state *state = opendata->state;
1302 struct nfs_inode *nfsi = NFS_I(state->inode);
1303 struct nfs_delegation *delegation;
1304 int open_mode = opendata->o_arg.open_flags;
1305 fmode_t fmode = opendata->o_arg.fmode;
1306 nfs4_stateid stateid;
1307 int ret = -EAGAIN;
1308
1309 for (;;) {
1310 if (can_open_cached(state, fmode, open_mode)) {
1311 spin_lock(&state->owner->so_lock);
1312 if (can_open_cached(state, fmode, open_mode)) {
1313 update_open_stateflags(state, fmode);
1314 spin_unlock(&state->owner->so_lock);
1315 goto out_return_state;
1316 }
1317 spin_unlock(&state->owner->so_lock);
1318 }
1319 rcu_read_lock();
1320 delegation = rcu_dereference(nfsi->delegation);
1321 if (!can_open_delegated(delegation, fmode)) {
1322 rcu_read_unlock();
1323 break;
1324 }
1325 /* Save the delegation */
1326 nfs4_stateid_copy(&stateid, &delegation->stateid);
1327 rcu_read_unlock();
1328 nfs_release_seqid(opendata->o_arg.seqid);
1329 if (!opendata->is_recover) {
1330 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1331 if (ret != 0)
1332 goto out;
1333 }
1334 ret = -EAGAIN;
1335
1336 /* Try to update the stateid using the delegation */
1337 if (update_open_stateid(state, NULL, &stateid, fmode))
1338 goto out_return_state;
1339 }
1340out:
1341 return ERR_PTR(ret);
1342out_return_state:
1343 atomic_inc(&state->count);
1344 return state;
1345}
1346
1347static void
1348nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1349{
1350 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1351 struct nfs_delegation *delegation;
1352 int delegation_flags = 0;
1353
1354 rcu_read_lock();
1355 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1356 if (delegation)
1357 delegation_flags = delegation->flags;
1358 rcu_read_unlock();
1359 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1360 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1361 "returning a delegation for "
1362 "OPEN(CLAIM_DELEGATE_CUR)\n",
1363 clp->cl_hostname);
1364 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1365 nfs_inode_set_delegation(state->inode,
1366 data->owner->so_cred,
1367 &data->o_res);
1368 else
1369 nfs_inode_reclaim_delegation(state->inode,
1370 data->owner->so_cred,
1371 &data->o_res);
1372}
1373
1374/*
1375 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1376 * and update the nfs4_state.
1377 */
1378static struct nfs4_state *
1379_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1380{
1381 struct inode *inode = data->state->inode;
1382 struct nfs4_state *state = data->state;
1383 int ret;
1384
1385 if (!data->rpc_done) {
1386 if (data->rpc_status) {
1387 ret = data->rpc_status;
1388 goto err;
1389 }
1390 /* cached opens have already been processed */
1391 goto update;
1392 }
1393
1394 ret = nfs_refresh_inode(inode, &data->f_attr);
1395 if (ret)
1396 goto err;
1397
1398 if (data->o_res.delegation_type != 0)
1399 nfs4_opendata_check_deleg(data, state);
1400update:
1401 update_open_stateid(state, &data->o_res.stateid, NULL,
1402 data->o_arg.fmode);
1403 atomic_inc(&state->count);
1404
1405 return state;
1406err:
1407 return ERR_PTR(ret);
1408
1409}
1410
1411static struct nfs4_state *
1412_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1413{
1414 struct inode *inode;
1415 struct nfs4_state *state = NULL;
1416 int ret;
1417
1418 if (!data->rpc_done) {
1419 state = nfs4_try_open_cached(data);
1420 goto out;
1421 }
1422
1423 ret = -EAGAIN;
1424 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1425 goto err;
1426 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1427 ret = PTR_ERR(inode);
1428 if (IS_ERR(inode))
1429 goto err;
1430 ret = -ENOMEM;
1431 state = nfs4_get_open_state(inode, data->owner);
1432 if (state == NULL)
1433 goto err_put_inode;
1434 if (data->o_res.delegation_type != 0)
1435 nfs4_opendata_check_deleg(data, state);
1436 update_open_stateid(state, &data->o_res.stateid, NULL,
1437 data->o_arg.fmode);
1438 iput(inode);
1439out:
1440 nfs_release_seqid(data->o_arg.seqid);
1441 return state;
1442err_put_inode:
1443 iput(inode);
1444err:
1445 return ERR_PTR(ret);
1446}
1447
1448static struct nfs4_state *
1449nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1450{
1451 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1452 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1453 return _nfs4_opendata_to_nfs4_state(data);
1454}
1455
1456static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1457{
1458 struct nfs_inode *nfsi = NFS_I(state->inode);
1459 struct nfs_open_context *ctx;
1460
1461 spin_lock(&state->inode->i_lock);
1462 list_for_each_entry(ctx, &nfsi->open_files, list) {
1463 if (ctx->state != state)
1464 continue;
1465 get_nfs_open_context(ctx);
1466 spin_unlock(&state->inode->i_lock);
1467 return ctx;
1468 }
1469 spin_unlock(&state->inode->i_lock);
1470 return ERR_PTR(-ENOENT);
1471}
1472
1473static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1474 struct nfs4_state *state, enum open_claim_type4 claim)
1475{
1476 struct nfs4_opendata *opendata;
1477
1478 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1479 NULL, NULL, claim, GFP_NOFS);
1480 if (opendata == NULL)
1481 return ERR_PTR(-ENOMEM);
1482 opendata->state = state;
1483 atomic_inc(&state->count);
1484 return opendata;
1485}
1486
1487static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1488{
1489 struct nfs4_state *newstate;
1490 int ret;
1491
1492 opendata->o_arg.open_flags = 0;
1493 opendata->o_arg.fmode = fmode;
1494 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1495 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1496 nfs4_init_opendata_res(opendata);
1497 ret = _nfs4_recover_proc_open(opendata);
1498 if (ret != 0)
1499 return ret;
1500 newstate = nfs4_opendata_to_nfs4_state(opendata);
1501 if (IS_ERR(newstate))
1502 return PTR_ERR(newstate);
1503 nfs4_close_state(newstate, fmode);
1504 *res = newstate;
1505 return 0;
1506}
1507
1508static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1509{
1510 struct nfs4_state *newstate;
1511 int ret;
1512
1513 /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1514 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1515 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1516 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1517 /* memory barrier prior to reading state->n_* */
1518 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1519 clear_bit(NFS_OPEN_STATE, &state->flags);
1520 smp_rmb();
1521 if (state->n_rdwr != 0) {
1522 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1523 if (ret != 0)
1524 return ret;
1525 if (newstate != state)
1526 return -ESTALE;
1527 }
1528 if (state->n_wronly != 0) {
1529 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1530 if (ret != 0)
1531 return ret;
1532 if (newstate != state)
1533 return -ESTALE;
1534 }
1535 if (state->n_rdonly != 0) {
1536 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1537 if (ret != 0)
1538 return ret;
1539 if (newstate != state)
1540 return -ESTALE;
1541 }
1542 /*
1543 * We may have performed cached opens for all three recoveries.
1544 * Check if we need to update the current stateid.
1545 */
1546 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1547 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1548 write_seqlock(&state->seqlock);
1549 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1550 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1551 write_sequnlock(&state->seqlock);
1552 }
1553 return 0;
1554}
1555
1556/*
1557 * OPEN_RECLAIM:
1558 * reclaim state on the server after a reboot.
1559 */
1560static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1561{
1562 struct nfs_delegation *delegation;
1563 struct nfs4_opendata *opendata;
1564 fmode_t delegation_type = 0;
1565 int status;
1566
1567 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1568 NFS4_OPEN_CLAIM_PREVIOUS);
1569 if (IS_ERR(opendata))
1570 return PTR_ERR(opendata);
1571 rcu_read_lock();
1572 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1573 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1574 delegation_type = delegation->type;
1575 rcu_read_unlock();
1576 opendata->o_arg.u.delegation_type = delegation_type;
1577 status = nfs4_open_recover(opendata, state);
1578 nfs4_opendata_put(opendata);
1579 return status;
1580}
1581
1582static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1583{
1584 struct nfs_server *server = NFS_SERVER(state->inode);
1585 struct nfs4_exception exception = { };
1586 int err;
1587 do {
1588 err = _nfs4_do_open_reclaim(ctx, state);
1589 trace_nfs4_open_reclaim(ctx, 0, err);
1590 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1591 continue;
1592 if (err != -NFS4ERR_DELAY)
1593 break;
1594 nfs4_handle_exception(server, err, &exception);
1595 } while (exception.retry);
1596 return err;
1597}
1598
1599static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1600{
1601 struct nfs_open_context *ctx;
1602 int ret;
1603
1604 ctx = nfs4_state_find_open_context(state);
1605 if (IS_ERR(ctx))
1606 return -EAGAIN;
1607 ret = nfs4_do_open_reclaim(ctx, state);
1608 put_nfs_open_context(ctx);
1609 return ret;
1610}
1611
1612static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1613{
1614 switch (err) {
1615 default:
1616 printk(KERN_ERR "NFS: %s: unhandled error "
1617 "%d.\n", __func__, err);
1618 case 0:
1619 case -ENOENT:
1620 case -ESTALE:
1621 break;
1622 case -NFS4ERR_BADSESSION:
1623 case -NFS4ERR_BADSLOT:
1624 case -NFS4ERR_BAD_HIGH_SLOT:
1625 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1626 case -NFS4ERR_DEADSESSION:
1627 set_bit(NFS_DELEGATED_STATE, &state->flags);
1628 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1629 return -EAGAIN;
1630 case -NFS4ERR_STALE_CLIENTID:
1631 case -NFS4ERR_STALE_STATEID:
1632 set_bit(NFS_DELEGATED_STATE, &state->flags);
1633 case -NFS4ERR_EXPIRED:
1634 /* Don't recall a delegation if it was lost */
1635 nfs4_schedule_lease_recovery(server->nfs_client);
1636 return -EAGAIN;
1637 case -NFS4ERR_MOVED:
1638 nfs4_schedule_migration_recovery(server);
1639 return -EAGAIN;
1640 case -NFS4ERR_LEASE_MOVED:
1641 nfs4_schedule_lease_moved_recovery(server->nfs_client);
1642 return -EAGAIN;
1643 case -NFS4ERR_DELEG_REVOKED:
1644 case -NFS4ERR_ADMIN_REVOKED:
1645 case -NFS4ERR_BAD_STATEID:
1646 case -NFS4ERR_OPENMODE:
1647 nfs_inode_find_state_and_recover(state->inode,
1648 stateid);
1649 nfs4_schedule_stateid_recovery(server, state);
1650 return 0;
1651 case -NFS4ERR_DELAY:
1652 case -NFS4ERR_GRACE:
1653 set_bit(NFS_DELEGATED_STATE, &state->flags);
1654 ssleep(1);
1655 return -EAGAIN;
1656 case -ENOMEM:
1657 case -NFS4ERR_DENIED:
1658 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1659 return 0;
1660 }
1661 return err;
1662}
1663
1664int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1665{
1666 struct nfs_server *server = NFS_SERVER(state->inode);
1667 struct nfs4_opendata *opendata;
1668 int err;
1669
1670 opendata = nfs4_open_recoverdata_alloc(ctx, state,
1671 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1672 if (IS_ERR(opendata))
1673 return PTR_ERR(opendata);
1674 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1675 err = nfs4_open_recover(opendata, state);
1676 nfs4_opendata_put(opendata);
1677 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1678}
1679
1680static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1681{
1682 struct nfs4_opendata *data = calldata;
1683
1684 nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1685 &data->c_res.seq_res, task);
1686}
1687
1688static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1689{
1690 struct nfs4_opendata *data = calldata;
1691
1692 nfs40_sequence_done(task, &data->c_res.seq_res);
1693
1694 data->rpc_status = task->tk_status;
1695 if (data->rpc_status == 0) {
1696 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1697 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1698 renew_lease(data->o_res.server, data->timestamp);
1699 data->rpc_done = 1;
1700 }
1701}
1702
1703static void nfs4_open_confirm_release(void *calldata)
1704{
1705 struct nfs4_opendata *data = calldata;
1706 struct nfs4_state *state = NULL;
1707
1708 /* If this request hasn't been cancelled, do nothing */
1709 if (data->cancelled == 0)
1710 goto out_free;
1711 /* In case of error, no cleanup! */
1712 if (!data->rpc_done)
1713 goto out_free;
1714 state = nfs4_opendata_to_nfs4_state(data);
1715 if (!IS_ERR(state))
1716 nfs4_close_state(state, data->o_arg.fmode);
1717out_free:
1718 nfs4_opendata_put(data);
1719}
1720
1721static const struct rpc_call_ops nfs4_open_confirm_ops = {
1722 .rpc_call_prepare = nfs4_open_confirm_prepare,
1723 .rpc_call_done = nfs4_open_confirm_done,
1724 .rpc_release = nfs4_open_confirm_release,
1725};
1726
1727/*
1728 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1729 */
1730static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1731{
1732 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1733 struct rpc_task *task;
1734 struct rpc_message msg = {
1735 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1736 .rpc_argp = &data->c_arg,
1737 .rpc_resp = &data->c_res,
1738 .rpc_cred = data->owner->so_cred,
1739 };
1740 struct rpc_task_setup task_setup_data = {
1741 .rpc_client = server->client,
1742 .rpc_message = &msg,
1743 .callback_ops = &nfs4_open_confirm_ops,
1744 .callback_data = data,
1745 .workqueue = nfsiod_workqueue,
1746 .flags = RPC_TASK_ASYNC,
1747 };
1748 int status;
1749
1750 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1751 kref_get(&data->kref);
1752 data->rpc_done = 0;
1753 data->rpc_status = 0;
1754 data->timestamp = jiffies;
1755 task = rpc_run_task(&task_setup_data);
1756 if (IS_ERR(task))
1757 return PTR_ERR(task);
1758 status = nfs4_wait_for_completion_rpc_task(task);
1759 if (status != 0) {
1760 data->cancelled = 1;
1761 smp_wmb();
1762 } else
1763 status = data->rpc_status;
1764 rpc_put_task(task);
1765 return status;
1766}
1767
1768static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1769{
1770 struct nfs4_opendata *data = calldata;
1771 struct nfs4_state_owner *sp = data->owner;
1772 struct nfs_client *clp = sp->so_server->nfs_client;
1773
1774 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1775 goto out_wait;
1776 /*
1777 * Check if we still need to send an OPEN call, or if we can use
1778 * a delegation instead.
1779 */
1780 if (data->state != NULL) {
1781 struct nfs_delegation *delegation;
1782
1783 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1784 goto out_no_action;
1785 rcu_read_lock();
1786 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1787 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1788 data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1789 can_open_delegated(delegation, data->o_arg.fmode))
1790 goto unlock_no_action;
1791 rcu_read_unlock();
1792 }
1793 /* Update client id. */
1794 data->o_arg.clientid = clp->cl_clientid;
1795 switch (data->o_arg.claim) {
1796 case NFS4_OPEN_CLAIM_PREVIOUS:
1797 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1798 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1799 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1800 case NFS4_OPEN_CLAIM_FH:
1801 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1802 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1803 }
1804 data->timestamp = jiffies;
1805 if (nfs4_setup_sequence(data->o_arg.server,
1806 &data->o_arg.seq_args,
1807 &data->o_res.seq_res,
1808 task) != 0)
1809 nfs_release_seqid(data->o_arg.seqid);
1810
1811 /* Set the create mode (note dependency on the session type) */
1812 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1813 if (data->o_arg.open_flags & O_EXCL) {
1814 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1815 if (nfs4_has_persistent_session(clp))
1816 data->o_arg.createmode = NFS4_CREATE_GUARDED;
1817 else if (clp->cl_mvops->minor_version > 0)
1818 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1819 }
1820 return;
1821unlock_no_action:
1822 rcu_read_unlock();
1823out_no_action:
1824 task->tk_action = NULL;
1825out_wait:
1826 nfs4_sequence_done(task, &data->o_res.seq_res);
1827}
1828
1829static void nfs4_open_done(struct rpc_task *task, void *calldata)
1830{
1831 struct nfs4_opendata *data = calldata;
1832
1833 data->rpc_status = task->tk_status;
1834
1835 if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1836 return;
1837
1838 if (task->tk_status == 0) {
1839 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1840 switch (data->o_res.f_attr->mode & S_IFMT) {
1841 case S_IFREG:
1842 break;
1843 case S_IFLNK:
1844 data->rpc_status = -ELOOP;
1845 break;
1846 case S_IFDIR:
1847 data->rpc_status = -EISDIR;
1848 break;
1849 default:
1850 data->rpc_status = -ENOTDIR;
1851 }
1852 }
1853 renew_lease(data->o_res.server, data->timestamp);
1854 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1855 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1856 }
1857 data->rpc_done = 1;
1858}
1859
1860static void nfs4_open_release(void *calldata)
1861{
1862 struct nfs4_opendata *data = calldata;
1863 struct nfs4_state *state = NULL;
1864
1865 /* If this request hasn't been cancelled, do nothing */
1866 if (data->cancelled == 0)
1867 goto out_free;
1868 /* In case of error, no cleanup! */
1869 if (data->rpc_status != 0 || !data->rpc_done)
1870 goto out_free;
1871 /* In case we need an open_confirm, no cleanup! */
1872 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1873 goto out_free;
1874 state = nfs4_opendata_to_nfs4_state(data);
1875 if (!IS_ERR(state))
1876 nfs4_close_state(state, data->o_arg.fmode);
1877out_free:
1878 nfs4_opendata_put(data);
1879}
1880
1881static const struct rpc_call_ops nfs4_open_ops = {
1882 .rpc_call_prepare = nfs4_open_prepare,
1883 .rpc_call_done = nfs4_open_done,
1884 .rpc_release = nfs4_open_release,
1885};
1886
1887static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1888{
1889 struct inode *dir = data->dir->d_inode;
1890 struct nfs_server *server = NFS_SERVER(dir);
1891 struct nfs_openargs *o_arg = &data->o_arg;
1892 struct nfs_openres *o_res = &data->o_res;
1893 struct rpc_task *task;
1894 struct rpc_message msg = {
1895 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1896 .rpc_argp = o_arg,
1897 .rpc_resp = o_res,
1898 .rpc_cred = data->owner->so_cred,
1899 };
1900 struct rpc_task_setup task_setup_data = {
1901 .rpc_client = server->client,
1902 .rpc_message = &msg,
1903 .callback_ops = &nfs4_open_ops,
1904 .callback_data = data,
1905 .workqueue = nfsiod_workqueue,
1906 .flags = RPC_TASK_ASYNC,
1907 };
1908 int status;
1909
1910 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1911 kref_get(&data->kref);
1912 data->rpc_done = 0;
1913 data->rpc_status = 0;
1914 data->cancelled = 0;
1915 data->is_recover = 0;
1916 if (isrecover) {
1917 nfs4_set_sequence_privileged(&o_arg->seq_args);
1918 data->is_recover = 1;
1919 }
1920 task = rpc_run_task(&task_setup_data);
1921 if (IS_ERR(task))
1922 return PTR_ERR(task);
1923 status = nfs4_wait_for_completion_rpc_task(task);
1924 if (status != 0) {
1925 data->cancelled = 1;
1926 smp_wmb();
1927 } else
1928 status = data->rpc_status;
1929 rpc_put_task(task);
1930
1931 return status;
1932}
1933
1934static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1935{
1936 struct inode *dir = data->dir->d_inode;
1937 struct nfs_openres *o_res = &data->o_res;
1938 int status;
1939
1940 status = nfs4_run_open_task(data, 1);
1941 if (status != 0 || !data->rpc_done)
1942 return status;
1943
1944 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1945
1946 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1947 status = _nfs4_proc_open_confirm(data);
1948 if (status != 0)
1949 return status;
1950 }
1951
1952 return status;
1953}
1954
1955static int nfs4_opendata_access(struct rpc_cred *cred,
1956 struct nfs4_opendata *opendata,
1957 struct nfs4_state *state, fmode_t fmode,
1958 int openflags)
1959{
1960 struct nfs_access_entry cache;
1961 u32 mask;
1962
1963 /* access call failed or for some reason the server doesn't
1964 * support any access modes -- defer access call until later */
1965 if (opendata->o_res.access_supported == 0)
1966 return 0;
1967
1968 mask = 0;
1969 /* don't check MAY_WRITE - a newly created file may not have
1970 * write mode bits, but POSIX allows the creating process to write.
1971 * use openflags to check for exec, because fmode won't
1972 * always have FMODE_EXEC set when file open for exec. */
1973 if (openflags & __FMODE_EXEC) {
1974 /* ONLY check for exec rights */
1975 mask = MAY_EXEC;
1976 } else if (fmode & FMODE_READ)
1977 mask = MAY_READ;
1978
1979 cache.cred = cred;
1980 cache.jiffies = jiffies;
1981 nfs_access_set_mask(&cache, opendata->o_res.access_result);
1982 nfs_access_add_cache(state->inode, &cache);
1983
1984 if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1985 return 0;
1986
1987 /* even though OPEN succeeded, access is denied. Close the file */
1988 nfs4_close_state(state, fmode);
1989 return -EACCES;
1990}
1991
1992/*
1993 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1994 */
1995static int _nfs4_proc_open(struct nfs4_opendata *data)
1996{
1997 struct inode *dir = data->dir->d_inode;
1998 struct nfs_server *server = NFS_SERVER(dir);
1999 struct nfs_openargs *o_arg = &data->o_arg;
2000 struct nfs_openres *o_res = &data->o_res;
2001 int status;
2002
2003 status = nfs4_run_open_task(data, 0);
2004 if (!data->rpc_done)
2005 return status;
2006 if (status != 0) {
2007 if (status == -NFS4ERR_BADNAME &&
2008 !(o_arg->open_flags & O_CREAT))
2009 return -ENOENT;
2010 return status;
2011 }
2012
2013 nfs_fattr_map_and_free_names(server, &data->f_attr);
2014
2015 if (o_arg->open_flags & O_CREAT) {
2016 update_changeattr(dir, &o_res->cinfo);
2017 if (o_arg->open_flags & O_EXCL)
2018 data->file_created = 1;
2019 else if (o_res->cinfo.before != o_res->cinfo.after)
2020 data->file_created = 1;
2021 }
2022 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2023 server->caps &= ~NFS_CAP_POSIX_LOCK;
2024 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2025 status = _nfs4_proc_open_confirm(data);
2026 if (status != 0)
2027 return status;
2028 }
2029 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2030 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2031 return 0;
2032}
2033
2034static int nfs4_recover_expired_lease(struct nfs_server *server)
2035{
2036 return nfs4_client_recover_expired_lease(server->nfs_client);
2037}
2038
2039/*
2040 * OPEN_EXPIRED:
2041 * reclaim state on the server after a network partition.
2042 * Assumes caller holds the appropriate lock
2043 */
2044static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2045{
2046 struct nfs4_opendata *opendata;
2047 int ret;
2048
2049 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2050 NFS4_OPEN_CLAIM_FH);
2051 if (IS_ERR(opendata))
2052 return PTR_ERR(opendata);
2053 ret = nfs4_open_recover(opendata, state);
2054 if (ret == -ESTALE)
2055 d_drop(ctx->dentry);
2056 nfs4_opendata_put(opendata);
2057 return ret;
2058}
2059
2060static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2061{
2062 struct nfs_server *server = NFS_SERVER(state->inode);
2063 struct nfs4_exception exception = { };
2064 int err;
2065
2066 do {
2067 err = _nfs4_open_expired(ctx, state);
2068 trace_nfs4_open_expired(ctx, 0, err);
2069 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2070 continue;
2071 switch (err) {
2072 default:
2073 goto out;
2074 case -NFS4ERR_GRACE:
2075 case -NFS4ERR_DELAY:
2076 nfs4_handle_exception(server, err, &exception);
2077 err = 0;
2078 }
2079 } while (exception.retry);
2080out:
2081 return err;
2082}
2083
2084static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2085{
2086 struct nfs_open_context *ctx;
2087 int ret;
2088
2089 ctx = nfs4_state_find_open_context(state);
2090 if (IS_ERR(ctx))
2091 return -EAGAIN;
2092 ret = nfs4_do_open_expired(ctx, state);
2093 put_nfs_open_context(ctx);
2094 return ret;
2095}
2096
2097#if defined(CONFIG_NFS_V4_1)
2098static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2099{
2100 struct nfs_server *server = NFS_SERVER(state->inode);
2101 nfs4_stateid *stateid = &state->stateid;
2102 struct nfs_delegation *delegation;
2103 struct rpc_cred *cred = NULL;
2104 int status = -NFS4ERR_BAD_STATEID;
2105
2106 /* If a state reset has been done, test_stateid is unneeded */
2107 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2108 return;
2109
2110 /* Get the delegation credential for use by test/free_stateid */
2111 rcu_read_lock();
2112 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2113 if (delegation != NULL &&
2114 nfs4_stateid_match(&delegation->stateid, stateid)) {
2115 cred = get_rpccred(delegation->cred);
2116 rcu_read_unlock();
2117 status = nfs41_test_stateid(server, stateid, cred);
2118 trace_nfs4_test_delegation_stateid(state, NULL, status);
2119 } else
2120 rcu_read_unlock();
2121
2122 if (status != NFS_OK) {
2123 /* Free the stateid unless the server explicitly
2124 * informs us the stateid is unrecognized. */
2125 if (status != -NFS4ERR_BAD_STATEID)
2126 nfs41_free_stateid(server, stateid, cred);
2127 nfs_remove_bad_delegation(state->inode);
2128
2129 write_seqlock(&state->seqlock);
2130 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2131 write_sequnlock(&state->seqlock);
2132 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2133 }
2134
2135 if (cred != NULL)
2136 put_rpccred(cred);
2137}
2138
2139/**
2140 * nfs41_check_open_stateid - possibly free an open stateid
2141 *
2142 * @state: NFSv4 state for an inode
2143 *
2144 * Returns NFS_OK if recovery for this stateid is now finished.
2145 * Otherwise a negative NFS4ERR value is returned.
2146 */
2147static int nfs41_check_open_stateid(struct nfs4_state *state)
2148{
2149 struct nfs_server *server = NFS_SERVER(state->inode);
2150 nfs4_stateid *stateid = &state->open_stateid;
2151 struct rpc_cred *cred = state->owner->so_cred;
2152 int status;
2153
2154 /* If a state reset has been done, test_stateid is unneeded */
2155 if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2156 (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2157 (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2158 return -NFS4ERR_BAD_STATEID;
2159
2160 status = nfs41_test_stateid(server, stateid, cred);
2161 trace_nfs4_test_open_stateid(state, NULL, status);
2162 if (status != NFS_OK) {
2163 /* Free the stateid unless the server explicitly
2164 * informs us the stateid is unrecognized. */
2165 if (status != -NFS4ERR_BAD_STATEID)
2166 nfs41_free_stateid(server, stateid, cred);
2167
2168 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2169 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2170 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2171 clear_bit(NFS_OPEN_STATE, &state->flags);
2172 }
2173 return status;
2174}
2175
2176static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2177{
2178 int status;
2179
2180 nfs41_clear_delegation_stateid(state);
2181 status = nfs41_check_open_stateid(state);
2182 if (status != NFS_OK)
2183 status = nfs4_open_expired(sp, state);
2184 return status;
2185}
2186#endif
2187
2188/*
2189 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2190 * fields corresponding to attributes that were used to store the verifier.
2191 * Make sure we clobber those fields in the later setattr call
2192 */
2193static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2194{
2195 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2196 !(sattr->ia_valid & ATTR_ATIME_SET))
2197 sattr->ia_valid |= ATTR_ATIME;
2198
2199 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2200 !(sattr->ia_valid & ATTR_MTIME_SET))
2201 sattr->ia_valid |= ATTR_MTIME;
2202}
2203
2204static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2205 fmode_t fmode,
2206 int flags,
2207 struct nfs_open_context *ctx)
2208{
2209 struct nfs4_state_owner *sp = opendata->owner;
2210 struct nfs_server *server = sp->so_server;
2211 struct dentry *dentry;
2212 struct nfs4_state *state;
2213 unsigned int seq;
2214 int ret;
2215
2216 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2217
2218 ret = _nfs4_proc_open(opendata);
2219 if (ret != 0)
2220 goto out;
2221
2222 state = nfs4_opendata_to_nfs4_state(opendata);
2223 ret = PTR_ERR(state);
2224 if (IS_ERR(state))
2225 goto out;
2226 if (server->caps & NFS_CAP_POSIX_LOCK)
2227 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2228
2229 dentry = opendata->dentry;
2230 if (dentry->d_inode == NULL) {
2231 /* FIXME: Is this d_drop() ever needed? */
2232 d_drop(dentry);
2233 dentry = d_add_unique(dentry, igrab(state->inode));
2234 if (dentry == NULL) {
2235 dentry = opendata->dentry;
2236 } else if (dentry != ctx->dentry) {
2237 dput(ctx->dentry);
2238 ctx->dentry = dget(dentry);
2239 }
2240 nfs_set_verifier(dentry,
2241 nfs_save_change_attribute(opendata->dir->d_inode));
2242 }
2243
2244 ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2245 if (ret != 0)
2246 goto out;
2247
2248 ctx->state = state;
2249 if (dentry->d_inode == state->inode) {
2250 nfs_inode_attach_open_context(ctx);
2251 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2252 nfs4_schedule_stateid_recovery(server, state);
2253 }
2254out:
2255 return ret;
2256}
2257
2258/*
2259 * Returns a referenced nfs4_state
2260 */
2261static int _nfs4_do_open(struct inode *dir,
2262 struct nfs_open_context *ctx,
2263 int flags,
2264 struct iattr *sattr,
2265 struct nfs4_label *label,
2266 int *opened)
2267{
2268 struct nfs4_state_owner *sp;
2269 struct nfs4_state *state = NULL;
2270 struct nfs_server *server = NFS_SERVER(dir);
2271 struct nfs4_opendata *opendata;
2272 struct dentry *dentry = ctx->dentry;
2273 struct rpc_cred *cred = ctx->cred;
2274 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2275 fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2276 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2277 struct nfs4_label *olabel = NULL;
2278 int status;
2279
2280 /* Protect against reboot recovery conflicts */
2281 status = -ENOMEM;
2282 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2283 if (sp == NULL) {
2284 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2285 goto out_err;
2286 }
2287 status = nfs4_recover_expired_lease(server);
2288 if (status != 0)
2289 goto err_put_state_owner;
2290 if (dentry->d_inode != NULL)
2291 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2292 status = -ENOMEM;
2293 if (dentry->d_inode)
2294 claim = NFS4_OPEN_CLAIM_FH;
2295 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2296 label, claim, GFP_KERNEL);
2297 if (opendata == NULL)
2298 goto err_put_state_owner;
2299
2300 if (label) {
2301 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2302 if (IS_ERR(olabel)) {
2303 status = PTR_ERR(olabel);
2304 goto err_opendata_put;
2305 }
2306 }
2307
2308 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2309 if (!opendata->f_attr.mdsthreshold) {
2310 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2311 if (!opendata->f_attr.mdsthreshold)
2312 goto err_free_label;
2313 }
2314 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2315 }
2316 if (dentry->d_inode != NULL)
2317 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2318
2319 status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2320 if (status != 0)
2321 goto err_free_label;
2322 state = ctx->state;
2323
2324 if ((opendata->o_arg.open_flags & O_EXCL) &&
2325 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2326 nfs4_exclusive_attrset(opendata, sattr);
2327
2328 nfs_fattr_init(opendata->o_res.f_attr);
2329 status = nfs4_do_setattr(state->inode, cred,
2330 opendata->o_res.f_attr, sattr,
2331 state, label, olabel);
2332 if (status == 0) {
2333 nfs_setattr_update_inode(state->inode, sattr);
2334 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2335 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2336 }
2337 }
2338 if (opendata->file_created)
2339 *opened |= FILE_CREATED;
2340
2341 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2342 *ctx_th = opendata->f_attr.mdsthreshold;
2343 opendata->f_attr.mdsthreshold = NULL;
2344 }
2345
2346 nfs4_label_free(olabel);
2347
2348 nfs4_opendata_put(opendata);
2349 nfs4_put_state_owner(sp);
2350 return 0;
2351err_free_label:
2352 nfs4_label_free(olabel);
2353err_opendata_put:
2354 nfs4_opendata_put(opendata);
2355err_put_state_owner:
2356 nfs4_put_state_owner(sp);
2357out_err:
2358 return status;
2359}
2360
2361
2362static struct nfs4_state *nfs4_do_open(struct inode *dir,
2363 struct nfs_open_context *ctx,
2364 int flags,
2365 struct iattr *sattr,
2366 struct nfs4_label *label,
2367 int *opened)
2368{
2369 struct nfs_server *server = NFS_SERVER(dir);
2370 struct nfs4_exception exception = { };
2371 struct nfs4_state *res;
2372 int status;
2373
2374 do {
2375 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2376 res = ctx->state;
2377 trace_nfs4_open_file(ctx, flags, status);
2378 if (status == 0)
2379 break;
2380 /* NOTE: BAD_SEQID means the server and client disagree about the
2381 * book-keeping w.r.t. state-changing operations
2382 * (OPEN/CLOSE/LOCK/LOCKU...)
2383 * It is actually a sign of a bug on the client or on the server.
2384 *
2385 * If we receive a BAD_SEQID error in the particular case of
2386 * doing an OPEN, we assume that nfs_increment_open_seqid() will
2387 * have unhashed the old state_owner for us, and that we can
2388 * therefore safely retry using a new one. We should still warn
2389 * the user though...
2390 */
2391 if (status == -NFS4ERR_BAD_SEQID) {
2392 pr_warn_ratelimited("NFS: v4 server %s "
2393 " returned a bad sequence-id error!\n",
2394 NFS_SERVER(dir)->nfs_client->cl_hostname);
2395 exception.retry = 1;
2396 continue;
2397 }
2398 /*
2399 * BAD_STATEID on OPEN means that the server cancelled our
2400 * state before it received the OPEN_CONFIRM.
2401 * Recover by retrying the request as per the discussion
2402 * on Page 181 of RFC3530.
2403 */
2404 if (status == -NFS4ERR_BAD_STATEID) {
2405 exception.retry = 1;
2406 continue;
2407 }
2408 if (status == -EAGAIN) {
2409 /* We must have found a delegation */
2410 exception.retry = 1;
2411 continue;
2412 }
2413 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2414 continue;
2415 res = ERR_PTR(nfs4_handle_exception(server,
2416 status, &exception));
2417 } while (exception.retry);
2418 return res;
2419}
2420
2421static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2422 struct nfs_fattr *fattr, struct iattr *sattr,
2423 struct nfs4_state *state, struct nfs4_label *ilabel,
2424 struct nfs4_label *olabel)
2425{
2426 struct nfs_server *server = NFS_SERVER(inode);
2427 struct nfs_setattrargs arg = {
2428 .fh = NFS_FH(inode),
2429 .iap = sattr,
2430 .server = server,
2431 .bitmask = server->attr_bitmask,
2432 .label = ilabel,
2433 };
2434 struct nfs_setattrres res = {
2435 .fattr = fattr,
2436 .label = olabel,
2437 .server = server,
2438 };
2439 struct rpc_message msg = {
2440 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2441 .rpc_argp = &arg,
2442 .rpc_resp = &res,
2443 .rpc_cred = cred,
2444 };
2445 unsigned long timestamp = jiffies;
2446 fmode_t fmode;
2447 bool truncate;
2448 int status;
2449
2450 arg.bitmask = nfs4_bitmask(server, ilabel);
2451 if (ilabel)
2452 arg.bitmask = nfs4_bitmask(server, olabel);
2453
2454 nfs_fattr_init(fattr);
2455
2456 /* Servers should only apply open mode checks for file size changes */
2457 truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2458 fmode = truncate ? FMODE_WRITE : FMODE_READ;
2459
2460 if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2461 /* Use that stateid */
2462 } else if (truncate && state != NULL) {
2463 struct nfs_lockowner lockowner = {
2464 .l_owner = current->files,
2465 .l_pid = current->tgid,
2466 };
2467 if (!nfs4_valid_open_stateid(state))
2468 return -EBADF;
2469 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2470 &lockowner) == -EIO)
2471 return -EBADF;
2472 } else
2473 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2474
2475 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2476 if (status == 0 && state != NULL)
2477 renew_lease(server, timestamp);
2478 return status;
2479}
2480
2481static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2482 struct nfs_fattr *fattr, struct iattr *sattr,
2483 struct nfs4_state *state, struct nfs4_label *ilabel,
2484 struct nfs4_label *olabel)
2485{
2486 struct nfs_server *server = NFS_SERVER(inode);
2487 struct nfs4_exception exception = {
2488 .state = state,
2489 .inode = inode,
2490 };
2491 int err;
2492 do {
2493 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2494 trace_nfs4_setattr(inode, err);
2495 switch (err) {
2496 case -NFS4ERR_OPENMODE:
2497 if (!(sattr->ia_valid & ATTR_SIZE)) {
2498 pr_warn_once("NFSv4: server %s is incorrectly "
2499 "applying open mode checks to "
2500 "a SETATTR that is not "
2501 "changing file size.\n",
2502 server->nfs_client->cl_hostname);
2503 }
2504 if (state && !(state->state & FMODE_WRITE)) {
2505 err = -EBADF;
2506 if (sattr->ia_valid & ATTR_OPEN)
2507 err = -EACCES;
2508 goto out;
2509 }
2510 }
2511 err = nfs4_handle_exception(server, err, &exception);
2512 } while (exception.retry);
2513out:
2514 return err;
2515}
2516
2517struct nfs4_closedata {
2518 struct inode *inode;
2519 struct nfs4_state *state;
2520 struct nfs_closeargs arg;
2521 struct nfs_closeres res;
2522 struct nfs_fattr fattr;
2523 unsigned long timestamp;
2524 bool roc;
2525 u32 roc_barrier;
2526};
2527
2528static void nfs4_free_closedata(void *data)
2529{
2530 struct nfs4_closedata *calldata = data;
2531 struct nfs4_state_owner *sp = calldata->state->owner;
2532 struct super_block *sb = calldata->state->inode->i_sb;
2533
2534 if (calldata->roc)
2535 pnfs_roc_release(calldata->state->inode);
2536 nfs4_put_open_state(calldata->state);
2537 nfs_free_seqid(calldata->arg.seqid);
2538 nfs4_put_state_owner(sp);
2539 nfs_sb_deactive(sb);
2540 kfree(calldata);
2541}
2542
2543static void nfs4_close_done(struct rpc_task *task, void *data)
2544{
2545 struct nfs4_closedata *calldata = data;
2546 struct nfs4_state *state = calldata->state;
2547 struct nfs_server *server = NFS_SERVER(calldata->inode);
2548
2549 dprintk("%s: begin!\n", __func__);
2550 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2551 return;
2552 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2553 /* hmm. we are done with the inode, and in the process of freeing
2554 * the state_owner. we keep this around to process errors
2555 */
2556 switch (task->tk_status) {
2557 case 0:
2558 if (calldata->roc)
2559 pnfs_roc_set_barrier(state->inode,
2560 calldata->roc_barrier);
2561 nfs_clear_open_stateid(state, &calldata->res.stateid, 0);
2562 renew_lease(server, calldata->timestamp);
2563 goto out_release;
2564 case -NFS4ERR_ADMIN_REVOKED:
2565 case -NFS4ERR_STALE_STATEID:
2566 case -NFS4ERR_OLD_STATEID:
2567 case -NFS4ERR_BAD_STATEID:
2568 case -NFS4ERR_EXPIRED:
2569 if (calldata->arg.fmode == 0)
2570 break;
2571 default:
2572 if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2573 rpc_restart_call_prepare(task);
2574 goto out_release;
2575 }
2576 }
2577 nfs_clear_open_stateid(state, NULL, calldata->arg.fmode);
2578out_release:
2579 nfs_release_seqid(calldata->arg.seqid);
2580 nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2581 dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2582}
2583
2584static void nfs4_close_prepare(struct rpc_task *task, void *data)
2585{
2586 struct nfs4_closedata *calldata = data;
2587 struct nfs4_state *state = calldata->state;
2588 struct inode *inode = calldata->inode;
2589 int call_close = 0;
2590
2591 dprintk("%s: begin!\n", __func__);
2592 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2593 goto out_wait;
2594
2595 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2596 calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2597 spin_lock(&state->owner->so_lock);
2598 /* Calculate the change in open mode */
2599 if (state->n_rdwr == 0) {
2600 if (state->n_rdonly == 0) {
2601 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2602 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2603 calldata->arg.fmode &= ~FMODE_READ;
2604 }
2605 if (state->n_wronly == 0) {
2606 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2607 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2608 calldata->arg.fmode &= ~FMODE_WRITE;
2609 }
2610 }
2611 if (!nfs4_valid_open_stateid(state))
2612 call_close = 0;
2613 spin_unlock(&state->owner->so_lock);
2614
2615 if (!call_close) {
2616 /* Note: exit _without_ calling nfs4_close_done */
2617 goto out_no_action;
2618 }
2619
2620 if (calldata->arg.fmode == 0) {
2621 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2622 if (calldata->roc &&
2623 pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2624 nfs_release_seqid(calldata->arg.seqid);
2625 goto out_wait;
2626 }
2627 }
2628
2629 nfs_fattr_init(calldata->res.fattr);
2630 calldata->timestamp = jiffies;
2631 if (nfs4_setup_sequence(NFS_SERVER(inode),
2632 &calldata->arg.seq_args,
2633 &calldata->res.seq_res,
2634 task) != 0)
2635 nfs_release_seqid(calldata->arg.seqid);
2636 dprintk("%s: done!\n", __func__);
2637 return;
2638out_no_action:
2639 task->tk_action = NULL;
2640out_wait:
2641 nfs4_sequence_done(task, &calldata->res.seq_res);
2642}
2643
2644static const struct rpc_call_ops nfs4_close_ops = {
2645 .rpc_call_prepare = nfs4_close_prepare,
2646 .rpc_call_done = nfs4_close_done,
2647 .rpc_release = nfs4_free_closedata,
2648};
2649
2650/*
2651 * It is possible for data to be read/written from a mem-mapped file
2652 * after the sys_close call (which hits the vfs layer as a flush).
2653 * This means that we can't safely call nfsv4 close on a file until
2654 * the inode is cleared. This in turn means that we are not good
2655 * NFSv4 citizens - we do not indicate to the server to update the file's
2656 * share state even when we are done with one of the three share
2657 * stateid's in the inode.
2658 *
2659 * NOTE: Caller must be holding the sp->so_owner semaphore!
2660 */
2661int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2662{
2663 struct nfs_server *server = NFS_SERVER(state->inode);
2664 struct nfs4_closedata *calldata;
2665 struct nfs4_state_owner *sp = state->owner;
2666 struct rpc_task *task;
2667 struct rpc_message msg = {
2668 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2669 .rpc_cred = state->owner->so_cred,
2670 };
2671 struct rpc_task_setup task_setup_data = {
2672 .rpc_client = server->client,
2673 .rpc_message = &msg,
2674 .callback_ops = &nfs4_close_ops,
2675 .workqueue = nfsiod_workqueue,
2676 .flags = RPC_TASK_ASYNC,
2677 };
2678 int status = -ENOMEM;
2679
2680 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2681 &task_setup_data.rpc_client, &msg);
2682
2683 calldata = kzalloc(sizeof(*calldata), gfp_mask);
2684 if (calldata == NULL)
2685 goto out;
2686 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2687 calldata->inode = state->inode;
2688 calldata->state = state;
2689 calldata->arg.fh = NFS_FH(state->inode);
2690 calldata->arg.stateid = &state->open_stateid;
2691 /* Serialization for the sequence id */
2692 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2693 if (calldata->arg.seqid == NULL)
2694 goto out_free_calldata;
2695 calldata->arg.fmode = 0;
2696 calldata->arg.bitmask = server->cache_consistency_bitmask;
2697 calldata->res.fattr = &calldata->fattr;
2698 calldata->res.seqid = calldata->arg.seqid;
2699 calldata->res.server = server;
2700 calldata->roc = pnfs_roc(state->inode);
2701 nfs_sb_active(calldata->inode->i_sb);
2702
2703 msg.rpc_argp = &calldata->arg;
2704 msg.rpc_resp = &calldata->res;
2705 task_setup_data.callback_data = calldata;
2706 task = rpc_run_task(&task_setup_data);
2707 if (IS_ERR(task))
2708 return PTR_ERR(task);
2709 status = 0;
2710 if (wait)
2711 status = rpc_wait_for_completion_task(task);
2712 rpc_put_task(task);
2713 return status;
2714out_free_calldata:
2715 kfree(calldata);
2716out:
2717 nfs4_put_open_state(state);
2718 nfs4_put_state_owner(sp);
2719 return status;
2720}
2721
2722static struct inode *
2723nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2724 int open_flags, struct iattr *attr, int *opened)
2725{
2726 struct nfs4_state *state;
2727 struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2728
2729 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2730
2731 /* Protect against concurrent sillydeletes */
2732 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2733
2734 nfs4_label_release_security(label);
2735
2736 if (IS_ERR(state))
2737 return ERR_CAST(state);
2738 return state->inode;
2739}
2740
2741static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2742{
2743 if (ctx->state == NULL)
2744 return;
2745 if (is_sync)
2746 nfs4_close_sync(ctx->state, ctx->mode);
2747 else
2748 nfs4_close_state(ctx->state, ctx->mode);
2749}
2750
2751#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2752#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2753#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL)
2754
2755static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2756{
2757 struct nfs4_server_caps_arg args = {
2758 .fhandle = fhandle,
2759 };
2760 struct nfs4_server_caps_res res = {};
2761 struct rpc_message msg = {
2762 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2763 .rpc_argp = &args,
2764 .rpc_resp = &res,
2765 };
2766 int status;
2767
2768 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2769 if (status == 0) {
2770 /* Sanity check the server answers */
2771 switch (server->nfs_client->cl_minorversion) {
2772 case 0:
2773 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2774 res.attr_bitmask[2] = 0;
2775 break;
2776 case 1:
2777 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2778 break;
2779 case 2:
2780 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2781 }
2782 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2783 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2784 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2785 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2786 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2787 NFS_CAP_CTIME|NFS_CAP_MTIME|
2788 NFS_CAP_SECURITY_LABEL);
2789 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2790 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2791 server->caps |= NFS_CAP_ACLS;
2792 if (res.has_links != 0)
2793 server->caps |= NFS_CAP_HARDLINKS;
2794 if (res.has_symlinks != 0)
2795 server->caps |= NFS_CAP_SYMLINKS;
2796 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2797 server->caps |= NFS_CAP_FILEID;
2798 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2799 server->caps |= NFS_CAP_MODE;
2800 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2801 server->caps |= NFS_CAP_NLINK;
2802 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2803 server->caps |= NFS_CAP_OWNER;
2804 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2805 server->caps |= NFS_CAP_OWNER_GROUP;
2806 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2807 server->caps |= NFS_CAP_ATIME;
2808 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2809 server->caps |= NFS_CAP_CTIME;
2810 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2811 server->caps |= NFS_CAP_MTIME;
2812#ifdef CONFIG_NFS_V4_SECURITY_LABEL
2813 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2814 server->caps |= NFS_CAP_SECURITY_LABEL;
2815#endif
2816 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2817 sizeof(server->attr_bitmask));
2818 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2819
2820 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2821 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2822 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2823 server->cache_consistency_bitmask[2] = 0;
2824 server->acl_bitmask = res.acl_bitmask;
2825 server->fh_expire_type = res.fh_expire_type;
2826 }
2827
2828 return status;
2829}
2830
2831int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2832{
2833 struct nfs4_exception exception = { };
2834 int err;
2835 do {
2836 err = nfs4_handle_exception(server,
2837 _nfs4_server_capabilities(server, fhandle),
2838 &exception);
2839 } while (exception.retry);
2840 return err;
2841}
2842
2843static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2844 struct nfs_fsinfo *info)
2845{
2846 u32 bitmask[3];
2847 struct nfs4_lookup_root_arg args = {
2848 .bitmask = bitmask,
2849 };
2850 struct nfs4_lookup_res res = {
2851 .server = server,
2852 .fattr = info->fattr,
2853 .fh = fhandle,
2854 };
2855 struct rpc_message msg = {
2856 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2857 .rpc_argp = &args,
2858 .rpc_resp = &res,
2859 };
2860
2861 bitmask[0] = nfs4_fattr_bitmap[0];
2862 bitmask[1] = nfs4_fattr_bitmap[1];
2863 /*
2864 * Process the label in the upcoming getfattr
2865 */
2866 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2867
2868 nfs_fattr_init(info->fattr);
2869 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2870}
2871
2872static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2873 struct nfs_fsinfo *info)
2874{
2875 struct nfs4_exception exception = { };
2876 int err;
2877 do {
2878 err = _nfs4_lookup_root(server, fhandle, info);
2879 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2880 switch (err) {
2881 case 0:
2882 case -NFS4ERR_WRONGSEC:
2883 goto out;
2884 default:
2885 err = nfs4_handle_exception(server, err, &exception);
2886 }
2887 } while (exception.retry);
2888out:
2889 return err;
2890}
2891
2892static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2893 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2894{
2895 struct rpc_auth_create_args auth_args = {
2896 .pseudoflavor = flavor,
2897 };
2898 struct rpc_auth *auth;
2899 int ret;
2900
2901 auth = rpcauth_create(&auth_args, server->client);
2902 if (IS_ERR(auth)) {
2903 ret = -EACCES;
2904 goto out;
2905 }
2906 ret = nfs4_lookup_root(server, fhandle, info);
2907out:
2908 return ret;
2909}
2910
2911/*
2912 * Retry pseudoroot lookup with various security flavors. We do this when:
2913 *
2914 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2915 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2916 *
2917 * Returns zero on success, or a negative NFS4ERR value, or a
2918 * negative errno value.
2919 */
2920static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2921 struct nfs_fsinfo *info)
2922{
2923 /* Per 3530bis 15.33.5 */
2924 static const rpc_authflavor_t flav_array[] = {
2925 RPC_AUTH_GSS_KRB5P,
2926 RPC_AUTH_GSS_KRB5I,
2927 RPC_AUTH_GSS_KRB5,
2928 RPC_AUTH_UNIX, /* courtesy */
2929 RPC_AUTH_NULL,
2930 };
2931 int status = -EPERM;
2932 size_t i;
2933
2934 if (server->auth_info.flavor_len > 0) {
2935 /* try each flavor specified by user */
2936 for (i = 0; i < server->auth_info.flavor_len; i++) {
2937 status = nfs4_lookup_root_sec(server, fhandle, info,
2938 server->auth_info.flavors[i]);
2939 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2940 continue;
2941 break;
2942 }
2943 } else {
2944 /* no flavors specified by user, try default list */
2945 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2946 status = nfs4_lookup_root_sec(server, fhandle, info,
2947 flav_array[i]);
2948 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2949 continue;
2950 break;
2951 }
2952 }
2953
2954 /*
2955 * -EACCESS could mean that the user doesn't have correct permissions
2956 * to access the mount. It could also mean that we tried to mount
2957 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
2958 * existing mount programs don't handle -EACCES very well so it should
2959 * be mapped to -EPERM instead.
2960 */
2961 if (status == -EACCES)
2962 status = -EPERM;
2963 return status;
2964}
2965
2966static int nfs4_do_find_root_sec(struct nfs_server *server,
2967 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2968{
2969 int mv = server->nfs_client->cl_minorversion;
2970 return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2971}
2972
2973/**
2974 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2975 * @server: initialized nfs_server handle
2976 * @fhandle: we fill in the pseudo-fs root file handle
2977 * @info: we fill in an FSINFO struct
2978 * @auth_probe: probe the auth flavours
2979 *
2980 * Returns zero on success, or a negative errno.
2981 */
2982int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2983 struct nfs_fsinfo *info,
2984 bool auth_probe)
2985{
2986 int status;
2987
2988 switch (auth_probe) {
2989 case false:
2990 status = nfs4_lookup_root(server, fhandle, info);
2991 if (status != -NFS4ERR_WRONGSEC)
2992 break;
2993 default:
2994 status = nfs4_do_find_root_sec(server, fhandle, info);
2995 }
2996
2997 if (status == 0)
2998 status = nfs4_server_capabilities(server, fhandle);
2999 if (status == 0)
3000 status = nfs4_do_fsinfo(server, fhandle, info);
3001
3002 return nfs4_map_errors(status);
3003}
3004
3005static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3006 struct nfs_fsinfo *info)
3007{
3008 int error;
3009 struct nfs_fattr *fattr = info->fattr;
3010 struct nfs4_label *label = NULL;
3011
3012 error = nfs4_server_capabilities(server, mntfh);
3013 if (error < 0) {
3014 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3015 return error;
3016 }
3017
3018 label = nfs4_label_alloc(server, GFP_KERNEL);
3019 if (IS_ERR(label))
3020 return PTR_ERR(label);
3021
3022 error = nfs4_proc_getattr(server, mntfh, fattr, label);
3023 if (error < 0) {
3024 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3025 goto err_free_label;
3026 }
3027
3028 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3029 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3030 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3031
3032err_free_label:
3033 nfs4_label_free(label);
3034
3035 return error;
3036}
3037
3038/*
3039 * Get locations and (maybe) other attributes of a referral.
3040 * Note that we'll actually follow the referral later when
3041 * we detect fsid mismatch in inode revalidation
3042 */
3043static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3044 const struct qstr *name, struct nfs_fattr *fattr,
3045 struct nfs_fh *fhandle)
3046{
3047 int status = -ENOMEM;
3048 struct page *page = NULL;
3049 struct nfs4_fs_locations *locations = NULL;
3050
3051 page = alloc_page(GFP_KERNEL);
3052 if (page == NULL)
3053 goto out;
3054 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3055 if (locations == NULL)
3056 goto out;
3057
3058 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3059 if (status != 0)
3060 goto out;
3061
3062 /*
3063 * If the fsid didn't change, this is a migration event, not a
3064 * referral. Cause us to drop into the exception handler, which
3065 * will kick off migration recovery.
3066 */
3067 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3068 dprintk("%s: server did not return a different fsid for"
3069 " a referral at %s\n", __func__, name->name);
3070 status = -NFS4ERR_MOVED;
3071 goto out;
3072 }
3073 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3074 nfs_fixup_referral_attributes(&locations->fattr);
3075
3076 /* replace the lookup nfs_fattr with the locations nfs_fattr */
3077 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3078 memset(fhandle, 0, sizeof(struct nfs_fh));
3079out:
3080 if (page)
3081 __free_page(page);
3082 kfree(locations);
3083 return status;
3084}
3085
3086static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3087 struct nfs_fattr *fattr, struct nfs4_label *label)
3088{
3089 struct nfs4_getattr_arg args = {
3090 .fh = fhandle,
3091 .bitmask = server->attr_bitmask,
3092 };
3093 struct nfs4_getattr_res res = {
3094 .fattr = fattr,
3095 .label = label,
3096 .server = server,
3097 };
3098 struct rpc_message msg = {
3099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3100 .rpc_argp = &args,
3101 .rpc_resp = &res,
3102 };
3103
3104 args.bitmask = nfs4_bitmask(server, label);
3105
3106 nfs_fattr_init(fattr);
3107 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3108}
3109
3110static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3111 struct nfs_fattr *fattr, struct nfs4_label *label)
3112{
3113 struct nfs4_exception exception = { };
3114 int err;
3115 do {
3116 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3117 trace_nfs4_getattr(server, fhandle, fattr, err);
3118 err = nfs4_handle_exception(server, err,
3119 &exception);
3120 } while (exception.retry);
3121 return err;
3122}
3123
3124/*
3125 * The file is not closed if it is opened due to the a request to change
3126 * the size of the file. The open call will not be needed once the
3127 * VFS layer lookup-intents are implemented.
3128 *
3129 * Close is called when the inode is destroyed.
3130 * If we haven't opened the file for O_WRONLY, we
3131 * need to in the size_change case to obtain a stateid.
3132 *
3133 * Got race?
3134 * Because OPEN is always done by name in nfsv4, it is
3135 * possible that we opened a different file by the same
3136 * name. We can recognize this race condition, but we
3137 * can't do anything about it besides returning an error.
3138 *
3139 * This will be fixed with VFS changes (lookup-intent).
3140 */
3141static int
3142nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3143 struct iattr *sattr)
3144{
3145 struct inode *inode = dentry->d_inode;
3146 struct rpc_cred *cred = NULL;
3147 struct nfs4_state *state = NULL;
3148 struct nfs4_label *label = NULL;
3149 int status;
3150
3151 if (pnfs_ld_layoutret_on_setattr(inode))
3152 pnfs_commit_and_return_layout(inode);
3153
3154 nfs_fattr_init(fattr);
3155
3156 /* Deal with open(O_TRUNC) */
3157 if (sattr->ia_valid & ATTR_OPEN)
3158 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3159
3160 /* Optimization: if the end result is no change, don't RPC */
3161 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3162 return 0;
3163
3164 /* Search for an existing open(O_WRITE) file */
3165 if (sattr->ia_valid & ATTR_FILE) {
3166 struct nfs_open_context *ctx;
3167
3168 ctx = nfs_file_open_context(sattr->ia_file);
3169 if (ctx) {
3170 cred = ctx->cred;
3171 state = ctx->state;
3172 }
3173 }
3174
3175 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3176 if (IS_ERR(label))
3177 return PTR_ERR(label);
3178
3179 status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3180 if (status == 0) {
3181 nfs_setattr_update_inode(inode, sattr);
3182 nfs_setsecurity(inode, fattr, label);
3183 }
3184 nfs4_label_free(label);
3185 return status;
3186}
3187
3188static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3189 const struct qstr *name, struct nfs_fh *fhandle,
3190 struct nfs_fattr *fattr, struct nfs4_label *label)
3191{
3192 struct nfs_server *server = NFS_SERVER(dir);
3193 int status;
3194 struct nfs4_lookup_arg args = {
3195 .bitmask = server->attr_bitmask,
3196 .dir_fh = NFS_FH(dir),
3197 .name = name,
3198 };
3199 struct nfs4_lookup_res res = {
3200 .server = server,
3201 .fattr = fattr,
3202 .label = label,
3203 .fh = fhandle,
3204 };
3205 struct rpc_message msg = {
3206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3207 .rpc_argp = &args,
3208 .rpc_resp = &res,
3209 };
3210
3211 args.bitmask = nfs4_bitmask(server, label);
3212
3213 nfs_fattr_init(fattr);
3214
3215 dprintk("NFS call lookup %s\n", name->name);
3216 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3217 dprintk("NFS reply lookup: %d\n", status);
3218 return status;
3219}
3220
3221static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3222{
3223 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3224 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3225 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3226 fattr->nlink = 2;
3227}
3228
3229static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3230 struct qstr *name, struct nfs_fh *fhandle,
3231 struct nfs_fattr *fattr, struct nfs4_label *label)
3232{
3233 struct nfs4_exception exception = { };
3234 struct rpc_clnt *client = *clnt;
3235 int err;
3236 do {
3237 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3238 trace_nfs4_lookup(dir, name, err);
3239 switch (err) {
3240 case -NFS4ERR_BADNAME:
3241 err = -ENOENT;
3242 goto out;
3243 case -NFS4ERR_MOVED:
3244 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3245 goto out;
3246 case -NFS4ERR_WRONGSEC:
3247 err = -EPERM;
3248 if (client != *clnt)
3249 goto out;
3250 client = nfs4_create_sec_client(client, dir, name);
3251 if (IS_ERR(client))
3252 return PTR_ERR(client);
3253
3254 exception.retry = 1;
3255 break;
3256 default:
3257 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3258 }
3259 } while (exception.retry);
3260
3261out:
3262 if (err == 0)
3263 *clnt = client;
3264 else if (client != *clnt)
3265 rpc_shutdown_client(client);
3266
3267 return err;
3268}
3269
3270static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3271 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3272 struct nfs4_label *label)
3273{
3274 int status;
3275 struct rpc_clnt *client = NFS_CLIENT(dir);
3276
3277 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3278 if (client != NFS_CLIENT(dir)) {
3279 rpc_shutdown_client(client);
3280 nfs_fixup_secinfo_attributes(fattr);
3281 }
3282 return status;
3283}
3284
3285struct rpc_clnt *
3286nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3287 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3288{
3289 struct rpc_clnt *client = NFS_CLIENT(dir);
3290 int status;
3291
3292 status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3293 if (status < 0)
3294 return ERR_PTR(status);
3295 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3296}
3297
3298static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3299{
3300 struct nfs_server *server = NFS_SERVER(inode);
3301 struct nfs4_accessargs args = {
3302 .fh = NFS_FH(inode),
3303 .bitmask = server->cache_consistency_bitmask,
3304 };
3305 struct nfs4_accessres res = {
3306 .server = server,
3307 };
3308 struct rpc_message msg = {
3309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3310 .rpc_argp = &args,
3311 .rpc_resp = &res,
3312 .rpc_cred = entry->cred,
3313 };
3314 int mode = entry->mask;
3315 int status = 0;
3316
3317 /*
3318 * Determine which access bits we want to ask for...
3319 */
3320 if (mode & MAY_READ)
3321 args.access |= NFS4_ACCESS_READ;
3322 if (S_ISDIR(inode->i_mode)) {
3323 if (mode & MAY_WRITE)
3324 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3325 if (mode & MAY_EXEC)
3326 args.access |= NFS4_ACCESS_LOOKUP;
3327 } else {
3328 if (mode & MAY_WRITE)
3329 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3330 if (mode & MAY_EXEC)
3331 args.access |= NFS4_ACCESS_EXECUTE;
3332 }
3333
3334 res.fattr = nfs_alloc_fattr();
3335 if (res.fattr == NULL)
3336 return -ENOMEM;
3337
3338 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3339 if (!status) {
3340 nfs_access_set_mask(entry, res.access);
3341 nfs_refresh_inode(inode, res.fattr);
3342 }
3343 nfs_free_fattr(res.fattr);
3344 return status;
3345}
3346
3347static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3348{
3349 struct nfs4_exception exception = { };
3350 int err;
3351 do {
3352 err = _nfs4_proc_access(inode, entry);
3353 trace_nfs4_access(inode, err);
3354 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3355 &exception);
3356 } while (exception.retry);
3357 return err;
3358}
3359
3360/*
3361 * TODO: For the time being, we don't try to get any attributes
3362 * along with any of the zero-copy operations READ, READDIR,
3363 * READLINK, WRITE.
3364 *
3365 * In the case of the first three, we want to put the GETATTR
3366 * after the read-type operation -- this is because it is hard
3367 * to predict the length of a GETATTR response in v4, and thus
3368 * align the READ data correctly. This means that the GETATTR
3369 * may end up partially falling into the page cache, and we should
3370 * shift it into the 'tail' of the xdr_buf before processing.
3371 * To do this efficiently, we need to know the total length
3372 * of data received, which doesn't seem to be available outside
3373 * of the RPC layer.
3374 *
3375 * In the case of WRITE, we also want to put the GETATTR after
3376 * the operation -- in this case because we want to make sure
3377 * we get the post-operation mtime and size.
3378 *
3379 * Both of these changes to the XDR layer would in fact be quite
3380 * minor, but I decided to leave them for a subsequent patch.
3381 */
3382static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3383 unsigned int pgbase, unsigned int pglen)
3384{
3385 struct nfs4_readlink args = {
3386 .fh = NFS_FH(inode),
3387 .pgbase = pgbase,
3388 .pglen = pglen,
3389 .pages = &page,
3390 };
3391 struct nfs4_readlink_res res;
3392 struct rpc_message msg = {
3393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3394 .rpc_argp = &args,
3395 .rpc_resp = &res,
3396 };
3397
3398 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3399}
3400
3401static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3402 unsigned int pgbase, unsigned int pglen)
3403{
3404 struct nfs4_exception exception = { };
3405 int err;
3406 do {
3407 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3408 trace_nfs4_readlink(inode, err);
3409 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3410 &exception);
3411 } while (exception.retry);
3412 return err;
3413}
3414
3415/*
3416 * This is just for mknod. open(O_CREAT) will always do ->open_context().
3417 */
3418static int
3419nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3420 int flags)
3421{
3422 struct nfs4_label l, *ilabel = NULL;
3423 struct nfs_open_context *ctx;
3424 struct nfs4_state *state;
3425 int opened = 0;
3426 int status = 0;
3427
3428 ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3429 if (IS_ERR(ctx))
3430 return PTR_ERR(ctx);
3431
3432 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3433
3434 sattr->ia_mode &= ~current_umask();
3435 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3436 if (IS_ERR(state)) {
3437 status = PTR_ERR(state);
3438 goto out;
3439 }
3440out:
3441 nfs4_label_release_security(ilabel);
3442 put_nfs_open_context(ctx);
3443 return status;
3444}
3445
3446static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3447{
3448 struct nfs_server *server = NFS_SERVER(dir);
3449 struct nfs_removeargs args = {
3450 .fh = NFS_FH(dir),
3451 .name = *name,
3452 };
3453 struct nfs_removeres res = {
3454 .server = server,
3455 };
3456 struct rpc_message msg = {
3457 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3458 .rpc_argp = &args,
3459 .rpc_resp = &res,
3460 };
3461 int status;
3462
3463 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3464 if (status == 0)
3465 update_changeattr(dir, &res.cinfo);
3466 return status;
3467}
3468
3469static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3470{
3471 struct nfs4_exception exception = { };
3472 int err;
3473 do {
3474 err = _nfs4_proc_remove(dir, name);
3475 trace_nfs4_remove(dir, name, err);
3476 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3477 &exception);
3478 } while (exception.retry);
3479 return err;
3480}
3481
3482static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3483{
3484 struct nfs_server *server = NFS_SERVER(dir);
3485 struct nfs_removeargs *args = msg->rpc_argp;
3486 struct nfs_removeres *res = msg->rpc_resp;
3487
3488 res->server = server;
3489 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3490 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3491
3492 nfs_fattr_init(res->dir_attr);
3493}
3494
3495static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3496{
3497 nfs4_setup_sequence(NFS_SERVER(data->dir),
3498 &data->args.seq_args,
3499 &data->res.seq_res,
3500 task);
3501}
3502
3503static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3504{
3505 struct nfs_unlinkdata *data = task->tk_calldata;
3506 struct nfs_removeres *res = &data->res;
3507
3508 if (!nfs4_sequence_done(task, &res->seq_res))
3509 return 0;
3510 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3511 return 0;
3512 update_changeattr(dir, &res->cinfo);
3513 return 1;
3514}
3515
3516static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3517{
3518 struct nfs_server *server = NFS_SERVER(dir);
3519 struct nfs_renameargs *arg = msg->rpc_argp;
3520 struct nfs_renameres *res = msg->rpc_resp;
3521
3522 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3523 res->server = server;
3524 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3525}
3526
3527static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3528{
3529 nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3530 &data->args.seq_args,
3531 &data->res.seq_res,
3532 task);
3533}
3534
3535static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3536 struct inode *new_dir)
3537{
3538 struct nfs_renamedata *data = task->tk_calldata;
3539 struct nfs_renameres *res = &data->res;
3540
3541 if (!nfs4_sequence_done(task, &res->seq_res))
3542 return 0;
3543 if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3544 return 0;
3545
3546 update_changeattr(old_dir, &res->old_cinfo);
3547 update_changeattr(new_dir, &res->new_cinfo);
3548 return 1;
3549}
3550
3551static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3552{
3553 struct nfs_server *server = NFS_SERVER(inode);
3554 struct nfs4_link_arg arg = {
3555 .fh = NFS_FH(inode),
3556 .dir_fh = NFS_FH(dir),
3557 .name = name,
3558 .bitmask = server->attr_bitmask,
3559 };
3560 struct nfs4_link_res res = {
3561 .server = server,
3562 .label = NULL,
3563 };
3564 struct rpc_message msg = {
3565 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3566 .rpc_argp = &arg,
3567 .rpc_resp = &res,
3568 };
3569 int status = -ENOMEM;
3570
3571 res.fattr = nfs_alloc_fattr();
3572 if (res.fattr == NULL)
3573 goto out;
3574
3575 res.label = nfs4_label_alloc(server, GFP_KERNEL);
3576 if (IS_ERR(res.label)) {
3577 status = PTR_ERR(res.label);
3578 goto out;
3579 }
3580 arg.bitmask = nfs4_bitmask(server, res.label);
3581
3582 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3583 if (!status) {
3584 update_changeattr(dir, &res.cinfo);
3585 status = nfs_post_op_update_inode(inode, res.fattr);
3586 if (!status)
3587 nfs_setsecurity(inode, res.fattr, res.label);
3588 }
3589
3590
3591 nfs4_label_free(res.label);
3592
3593out:
3594 nfs_free_fattr(res.fattr);
3595 return status;
3596}
3597
3598static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3599{
3600 struct nfs4_exception exception = { };
3601 int err;
3602 do {
3603 err = nfs4_handle_exception(NFS_SERVER(inode),
3604 _nfs4_proc_link(inode, dir, name),
3605 &exception);
3606 } while (exception.retry);
3607 return err;
3608}
3609
3610struct nfs4_createdata {
3611 struct rpc_message msg;
3612 struct nfs4_create_arg arg;
3613 struct nfs4_create_res res;
3614 struct nfs_fh fh;
3615 struct nfs_fattr fattr;
3616 struct nfs4_label *label;
3617};
3618
3619static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3620 struct qstr *name, struct iattr *sattr, u32 ftype)
3621{
3622 struct nfs4_createdata *data;
3623
3624 data = kzalloc(sizeof(*data), GFP_KERNEL);
3625 if (data != NULL) {
3626 struct nfs_server *server = NFS_SERVER(dir);
3627
3628 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3629 if (IS_ERR(data->label))
3630 goto out_free;
3631
3632 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3633 data->msg.rpc_argp = &data->arg;
3634 data->msg.rpc_resp = &data->res;
3635 data->arg.dir_fh = NFS_FH(dir);
3636 data->arg.server = server;
3637 data->arg.name = name;
3638 data->arg.attrs = sattr;
3639 data->arg.ftype = ftype;
3640 data->arg.bitmask = nfs4_bitmask(server, data->label);
3641 data->res.server = server;
3642 data->res.fh = &data->fh;
3643 data->res.fattr = &data->fattr;
3644 data->res.label = data->label;
3645 nfs_fattr_init(data->res.fattr);
3646 }
3647 return data;
3648out_free:
3649 kfree(data);
3650 return NULL;
3651}
3652
3653static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3654{
3655 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3656 &data->arg.seq_args, &data->res.seq_res, 1);
3657 if (status == 0) {
3658 update_changeattr(dir, &data->res.dir_cinfo);
3659 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3660 }
3661 return status;
3662}
3663
3664static void nfs4_free_createdata(struct nfs4_createdata *data)
3665{
3666 nfs4_label_free(data->label);
3667 kfree(data);
3668}
3669
3670static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3671 struct page *page, unsigned int len, struct iattr *sattr,
3672 struct nfs4_label *label)
3673{
3674 struct nfs4_createdata *data;
3675 int status = -ENAMETOOLONG;
3676
3677 if (len > NFS4_MAXPATHLEN)
3678 goto out;
3679
3680 status = -ENOMEM;
3681 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3682 if (data == NULL)
3683 goto out;
3684
3685 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3686 data->arg.u.symlink.pages = &page;
3687 data->arg.u.symlink.len = len;
3688 data->arg.label = label;
3689
3690 status = nfs4_do_create(dir, dentry, data);
3691
3692 nfs4_free_createdata(data);
3693out:
3694 return status;
3695}
3696
3697static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3698 struct page *page, unsigned int len, struct iattr *sattr)
3699{
3700 struct nfs4_exception exception = { };
3701 struct nfs4_label l, *label = NULL;
3702 int err;
3703
3704 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3705
3706 do {
3707 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3708 trace_nfs4_symlink(dir, &dentry->d_name, err);
3709 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3710 &exception);
3711 } while (exception.retry);
3712
3713 nfs4_label_release_security(label);
3714 return err;
3715}
3716
3717static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3718 struct iattr *sattr, struct nfs4_label *label)
3719{
3720 struct nfs4_createdata *data;
3721 int status = -ENOMEM;
3722
3723 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3724 if (data == NULL)
3725 goto out;
3726
3727 data->arg.label = label;
3728 status = nfs4_do_create(dir, dentry, data);
3729
3730 nfs4_free_createdata(data);
3731out:
3732 return status;
3733}
3734
3735static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3736 struct iattr *sattr)
3737{
3738 struct nfs4_exception exception = { };
3739 struct nfs4_label l, *label = NULL;
3740 int err;
3741
3742 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3743
3744 sattr->ia_mode &= ~current_umask();
3745 do {
3746 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3747 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3748 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3749 &exception);
3750 } while (exception.retry);
3751 nfs4_label_release_security(label);
3752
3753 return err;
3754}
3755
3756static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3757 u64 cookie, struct page **pages, unsigned int count, int plus)
3758{
3759 struct inode *dir = dentry->d_inode;
3760 struct nfs4_readdir_arg args = {
3761 .fh = NFS_FH(dir),
3762 .pages = pages,
3763 .pgbase = 0,
3764 .count = count,
3765 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3766 .plus = plus,
3767 };
3768 struct nfs4_readdir_res res;
3769 struct rpc_message msg = {
3770 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3771 .rpc_argp = &args,
3772 .rpc_resp = &res,
3773 .rpc_cred = cred,
3774 };
3775 int status;
3776
3777 dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3778 dentry,
3779 (unsigned long long)cookie);
3780 nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3781 res.pgbase = args.pgbase;
3782 status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3783 if (status >= 0) {
3784 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3785 status += args.pgbase;
3786 }
3787
3788 nfs_invalidate_atime(dir);
3789
3790 dprintk("%s: returns %d\n", __func__, status);
3791 return status;
3792}
3793
3794static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3795 u64 cookie, struct page **pages, unsigned int count, int plus)
3796{
3797 struct nfs4_exception exception = { };
3798 int err;
3799 do {
3800 err = _nfs4_proc_readdir(dentry, cred, cookie,
3801 pages, count, plus);
3802 trace_nfs4_readdir(dentry->d_inode, err);
3803 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3804 &exception);
3805 } while (exception.retry);
3806 return err;
3807}
3808
3809static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3810 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3811{
3812 struct nfs4_createdata *data;
3813 int mode = sattr->ia_mode;
3814 int status = -ENOMEM;
3815
3816 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3817 if (data == NULL)
3818 goto out;
3819
3820 if (S_ISFIFO(mode))
3821 data->arg.ftype = NF4FIFO;
3822 else if (S_ISBLK(mode)) {
3823 data->arg.ftype = NF4BLK;
3824 data->arg.u.device.specdata1 = MAJOR(rdev);
3825 data->arg.u.device.specdata2 = MINOR(rdev);
3826 }
3827 else if (S_ISCHR(mode)) {
3828 data->arg.ftype = NF4CHR;
3829 data->arg.u.device.specdata1 = MAJOR(rdev);
3830 data->arg.u.device.specdata2 = MINOR(rdev);
3831 } else if (!S_ISSOCK(mode)) {
3832 status = -EINVAL;
3833 goto out_free;
3834 }
3835
3836 data->arg.label = label;
3837 status = nfs4_do_create(dir, dentry, data);
3838out_free:
3839 nfs4_free_createdata(data);
3840out:
3841 return status;
3842}
3843
3844static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3845 struct iattr *sattr, dev_t rdev)
3846{
3847 struct nfs4_exception exception = { };
3848 struct nfs4_label l, *label = NULL;
3849 int err;
3850
3851 label = nfs4_label_init_security(dir, dentry, sattr, &l);
3852
3853 sattr->ia_mode &= ~current_umask();
3854 do {
3855 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3856 trace_nfs4_mknod(dir, &dentry->d_name, err);
3857 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3858 &exception);
3859 } while (exception.retry);
3860
3861 nfs4_label_release_security(label);
3862
3863 return err;
3864}
3865
3866static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3867 struct nfs_fsstat *fsstat)
3868{
3869 struct nfs4_statfs_arg args = {
3870 .fh = fhandle,
3871 .bitmask = server->attr_bitmask,
3872 };
3873 struct nfs4_statfs_res res = {
3874 .fsstat = fsstat,
3875 };
3876 struct rpc_message msg = {
3877 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3878 .rpc_argp = &args,
3879 .rpc_resp = &res,
3880 };
3881
3882 nfs_fattr_init(fsstat->fattr);
3883 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3884}
3885
3886static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3887{
3888 struct nfs4_exception exception = { };
3889 int err;
3890 do {
3891 err = nfs4_handle_exception(server,
3892 _nfs4_proc_statfs(server, fhandle, fsstat),
3893 &exception);
3894 } while (exception.retry);
3895 return err;
3896}
3897
3898static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3899 struct nfs_fsinfo *fsinfo)
3900{
3901 struct nfs4_fsinfo_arg args = {
3902 .fh = fhandle,
3903 .bitmask = server->attr_bitmask,
3904 };
3905 struct nfs4_fsinfo_res res = {
3906 .fsinfo = fsinfo,
3907 };
3908 struct rpc_message msg = {
3909 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3910 .rpc_argp = &args,
3911 .rpc_resp = &res,
3912 };
3913
3914 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3915}
3916
3917static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3918{
3919 struct nfs4_exception exception = { };
3920 unsigned long now = jiffies;
3921 int err;
3922
3923 do {
3924 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3925 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3926 if (err == 0) {
3927 struct nfs_client *clp = server->nfs_client;
3928
3929 spin_lock(&clp->cl_lock);
3930 clp->cl_lease_time = fsinfo->lease_time * HZ;
3931 clp->cl_last_renewal = now;
3932 spin_unlock(&clp->cl_lock);
3933 break;
3934 }
3935 err = nfs4_handle_exception(server, err, &exception);
3936 } while (exception.retry);
3937 return err;
3938}
3939
3940static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3941{
3942 int error;
3943
3944 nfs_fattr_init(fsinfo->fattr);
3945 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3946 if (error == 0) {
3947 /* block layout checks this! */
3948 server->pnfs_blksize = fsinfo->blksize;
3949 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3950 }
3951
3952 return error;
3953}
3954
3955static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3956 struct nfs_pathconf *pathconf)
3957{
3958 struct nfs4_pathconf_arg args = {
3959 .fh = fhandle,
3960 .bitmask = server->attr_bitmask,
3961 };
3962 struct nfs4_pathconf_res res = {
3963 .pathconf = pathconf,
3964 };
3965 struct rpc_message msg = {
3966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3967 .rpc_argp = &args,
3968 .rpc_resp = &res,
3969 };
3970
3971 /* None of the pathconf attributes are mandatory to implement */
3972 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3973 memset(pathconf, 0, sizeof(*pathconf));
3974 return 0;
3975 }
3976
3977 nfs_fattr_init(pathconf->fattr);
3978 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3979}
3980
3981static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3982 struct nfs_pathconf *pathconf)
3983{
3984 struct nfs4_exception exception = { };
3985 int err;
3986
3987 do {
3988 err = nfs4_handle_exception(server,
3989 _nfs4_proc_pathconf(server, fhandle, pathconf),
3990 &exception);
3991 } while (exception.retry);
3992 return err;
3993}
3994
3995int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3996 const struct nfs_open_context *ctx,
3997 const struct nfs_lock_context *l_ctx,
3998 fmode_t fmode)
3999{
4000 const struct nfs_lockowner *lockowner = NULL;
4001
4002 if (l_ctx != NULL)
4003 lockowner = &l_ctx->lockowner;
4004 return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4005}
4006EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4007
4008static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4009 const struct nfs_open_context *ctx,
4010 const struct nfs_lock_context *l_ctx,
4011 fmode_t fmode)
4012{
4013 nfs4_stateid current_stateid;
4014
4015 /* If the current stateid represents a lost lock, then exit */
4016 if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4017 return true;
4018 return nfs4_stateid_match(stateid, &current_stateid);
4019}
4020
4021static bool nfs4_error_stateid_expired(int err)
4022{
4023 switch (err) {
4024 case -NFS4ERR_DELEG_REVOKED:
4025 case -NFS4ERR_ADMIN_REVOKED:
4026 case -NFS4ERR_BAD_STATEID:
4027 case -NFS4ERR_STALE_STATEID:
4028 case -NFS4ERR_OLD_STATEID:
4029 case -NFS4ERR_OPENMODE:
4030 case -NFS4ERR_EXPIRED:
4031 return true;
4032 }
4033 return false;
4034}
4035
4036void __nfs4_read_done_cb(struct nfs_pgio_data *data)
4037{
4038 nfs_invalidate_atime(data->header->inode);
4039}
4040
4041static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_data *data)
4042{
4043 struct nfs_server *server = NFS_SERVER(data->header->inode);
4044
4045 trace_nfs4_read(data, task->tk_status);
4046 if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4047 rpc_restart_call_prepare(task);
4048 return -EAGAIN;
4049 }
4050
4051 __nfs4_read_done_cb(data);
4052 if (task->tk_status > 0)
4053 renew_lease(server, data->timestamp);
4054 return 0;
4055}
4056
4057static bool nfs4_read_stateid_changed(struct rpc_task *task,
4058 struct nfs_pgio_args *args)
4059{
4060
4061 if (!nfs4_error_stateid_expired(task->tk_status) ||
4062 nfs4_stateid_is_current(&args->stateid,
4063 args->context,
4064 args->lock_context,
4065 FMODE_READ))
4066 return false;
4067 rpc_restart_call_prepare(task);
4068 return true;
4069}
4070
4071static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_data *data)
4072{
4073
4074 dprintk("--> %s\n", __func__);
4075
4076 if (!nfs4_sequence_done(task, &data->res.seq_res))
4077 return -EAGAIN;
4078 if (nfs4_read_stateid_changed(task, &data->args))
4079 return -EAGAIN;
4080 return data->pgio_done_cb ? data->pgio_done_cb(task, data) :
4081 nfs4_read_done_cb(task, data);
4082}
4083
4084static void nfs4_proc_read_setup(struct nfs_pgio_data *data, struct rpc_message *msg)
4085{
4086 data->timestamp = jiffies;
4087 data->pgio_done_cb = nfs4_read_done_cb;
4088 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4089 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4090}
4091
4092static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_pgio_data *data)
4093{
4094 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4095 &data->args.seq_args,
4096 &data->res.seq_res,
4097 task))
4098 return 0;
4099 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4100 data->args.lock_context, FMODE_READ) == -EIO)
4101 return -EIO;
4102 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4103 return -EIO;
4104 return 0;
4105}
4106
4107static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_pgio_data *data)
4108{
4109 struct inode *inode = data->header->inode;
4110
4111 trace_nfs4_write(data, task->tk_status);
4112 if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4113 rpc_restart_call_prepare(task);
4114 return -EAGAIN;
4115 }
4116 if (task->tk_status >= 0) {
4117 renew_lease(NFS_SERVER(inode), data->timestamp);
4118 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4119 }
4120 return 0;
4121}
4122
4123static bool nfs4_write_stateid_changed(struct rpc_task *task,
4124 struct nfs_pgio_args *args)
4125{
4126
4127 if (!nfs4_error_stateid_expired(task->tk_status) ||
4128 nfs4_stateid_is_current(&args->stateid,
4129 args->context,
4130 args->lock_context,
4131 FMODE_WRITE))
4132 return false;
4133 rpc_restart_call_prepare(task);
4134 return true;
4135}
4136
4137static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_data *data)
4138{
4139 if (!nfs4_sequence_done(task, &data->res.seq_res))
4140 return -EAGAIN;
4141 if (nfs4_write_stateid_changed(task, &data->args))
4142 return -EAGAIN;
4143 return data->pgio_done_cb ? data->pgio_done_cb(task, data) :
4144 nfs4_write_done_cb(task, data);
4145}
4146
4147static
4148bool nfs4_write_need_cache_consistency_data(const struct nfs_pgio_data *data)
4149{
4150 const struct nfs_pgio_header *hdr = data->header;
4151
4152 /* Don't request attributes for pNFS or O_DIRECT writes */
4153 if (data->ds_clp != NULL || hdr->dreq != NULL)
4154 return false;
4155 /* Otherwise, request attributes if and only if we don't hold
4156 * a delegation
4157 */
4158 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4159}
4160
4161static void nfs4_proc_write_setup(struct nfs_pgio_data *data, struct rpc_message *msg)
4162{
4163 struct nfs_server *server = NFS_SERVER(data->header->inode);
4164
4165 if (!nfs4_write_need_cache_consistency_data(data)) {
4166 data->args.bitmask = NULL;
4167 data->res.fattr = NULL;
4168 } else
4169 data->args.bitmask = server->cache_consistency_bitmask;
4170
4171 if (!data->pgio_done_cb)
4172 data->pgio_done_cb = nfs4_write_done_cb;
4173 data->res.server = server;
4174 data->timestamp = jiffies;
4175
4176 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4177 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4178}
4179
4180static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_pgio_data *data)
4181{
4182 if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4183 &data->args.seq_args,
4184 &data->res.seq_res,
4185 task))
4186 return 0;
4187 if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4188 data->args.lock_context, FMODE_WRITE) == -EIO)
4189 return -EIO;
4190 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4191 return -EIO;
4192 return 0;
4193}
4194
4195static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4196{
4197 nfs4_setup_sequence(NFS_SERVER(data->inode),
4198 &data->args.seq_args,
4199 &data->res.seq_res,
4200 task);
4201}
4202
4203static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4204{
4205 struct inode *inode = data->inode;
4206
4207 trace_nfs4_commit(data, task->tk_status);
4208 if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4209 rpc_restart_call_prepare(task);
4210 return -EAGAIN;
4211 }
4212 return 0;
4213}
4214
4215static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4216{
4217 if (!nfs4_sequence_done(task, &data->res.seq_res))
4218 return -EAGAIN;
4219 return data->commit_done_cb(task, data);
4220}
4221
4222static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4223{
4224 struct nfs_server *server = NFS_SERVER(data->inode);
4225
4226 if (data->commit_done_cb == NULL)
4227 data->commit_done_cb = nfs4_commit_done_cb;
4228 data->res.server = server;
4229 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4230 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4231}
4232
4233struct nfs4_renewdata {
4234 struct nfs_client *client;
4235 unsigned long timestamp;
4236};
4237
4238/*
4239 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4240 * standalone procedure for queueing an asynchronous RENEW.
4241 */
4242static void nfs4_renew_release(void *calldata)
4243{
4244 struct nfs4_renewdata *data = calldata;
4245 struct nfs_client *clp = data->client;
4246
4247 if (atomic_read(&clp->cl_count) > 1)
4248 nfs4_schedule_state_renewal(clp);
4249 nfs_put_client(clp);
4250 kfree(data);
4251}
4252
4253static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4254{
4255 struct nfs4_renewdata *data = calldata;
4256 struct nfs_client *clp = data->client;
4257 unsigned long timestamp = data->timestamp;
4258
4259 trace_nfs4_renew_async(clp, task->tk_status);
4260 switch (task->tk_status) {
4261 case 0:
4262 break;
4263 case -NFS4ERR_LEASE_MOVED:
4264 nfs4_schedule_lease_moved_recovery(clp);
4265 break;
4266 default:
4267 /* Unless we're shutting down, schedule state recovery! */
4268 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4269 return;
4270 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4271 nfs4_schedule_lease_recovery(clp);
4272 return;
4273 }
4274 nfs4_schedule_path_down_recovery(clp);
4275 }
4276 do_renew_lease(clp, timestamp);
4277}
4278
4279static const struct rpc_call_ops nfs4_renew_ops = {
4280 .rpc_call_done = nfs4_renew_done,
4281 .rpc_release = nfs4_renew_release,
4282};
4283
4284static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4285{
4286 struct rpc_message msg = {
4287 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4288 .rpc_argp = clp,
4289 .rpc_cred = cred,
4290 };
4291 struct nfs4_renewdata *data;
4292
4293 if (renew_flags == 0)
4294 return 0;
4295 if (!atomic_inc_not_zero(&clp->cl_count))
4296 return -EIO;
4297 data = kmalloc(sizeof(*data), GFP_NOFS);
4298 if (data == NULL)
4299 return -ENOMEM;
4300 data->client = clp;
4301 data->timestamp = jiffies;
4302 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4303 &nfs4_renew_ops, data);
4304}
4305
4306static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4307{
4308 struct rpc_message msg = {
4309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4310 .rpc_argp = clp,
4311 .rpc_cred = cred,
4312 };
4313 unsigned long now = jiffies;
4314 int status;
4315
4316 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4317 if (status < 0)
4318 return status;
4319 do_renew_lease(clp, now);
4320 return 0;
4321}
4322
4323static inline int nfs4_server_supports_acls(struct nfs_server *server)
4324{
4325 return server->caps & NFS_CAP_ACLS;
4326}
4327
4328/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4329 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4330 * the stack.
4331 */
4332#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4333
4334static int buf_to_pages_noslab(const void *buf, size_t buflen,
4335 struct page **pages, unsigned int *pgbase)
4336{
4337 struct page *newpage, **spages;
4338 int rc = 0;
4339 size_t len;
4340 spages = pages;
4341
4342 do {
4343 len = min_t(size_t, PAGE_SIZE, buflen);
4344 newpage = alloc_page(GFP_KERNEL);
4345
4346 if (newpage == NULL)
4347 goto unwind;
4348 memcpy(page_address(newpage), buf, len);
4349 buf += len;
4350 buflen -= len;
4351 *pages++ = newpage;
4352 rc++;
4353 } while (buflen != 0);
4354
4355 return rc;
4356
4357unwind:
4358 for(; rc > 0; rc--)
4359 __free_page(spages[rc-1]);
4360 return -ENOMEM;
4361}
4362
4363struct nfs4_cached_acl {
4364 int cached;
4365 size_t len;
4366 char data[0];
4367};
4368
4369static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4370{
4371 struct nfs_inode *nfsi = NFS_I(inode);
4372
4373 spin_lock(&inode->i_lock);
4374 kfree(nfsi->nfs4_acl);
4375 nfsi->nfs4_acl = acl;
4376 spin_unlock(&inode->i_lock);
4377}
4378
4379static void nfs4_zap_acl_attr(struct inode *inode)
4380{
4381 nfs4_set_cached_acl(inode, NULL);
4382}
4383
4384static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4385{
4386 struct nfs_inode *nfsi = NFS_I(inode);
4387 struct nfs4_cached_acl *acl;
4388 int ret = -ENOENT;
4389
4390 spin_lock(&inode->i_lock);
4391 acl = nfsi->nfs4_acl;
4392 if (acl == NULL)
4393 goto out;
4394 if (buf == NULL) /* user is just asking for length */
4395 goto out_len;
4396 if (acl->cached == 0)
4397 goto out;
4398 ret = -ERANGE; /* see getxattr(2) man page */
4399 if (acl->len > buflen)
4400 goto out;
4401 memcpy(buf, acl->data, acl->len);
4402out_len:
4403 ret = acl->len;
4404out:
4405 spin_unlock(&inode->i_lock);
4406 return ret;
4407}
4408
4409static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4410{
4411 struct nfs4_cached_acl *acl;
4412 size_t buflen = sizeof(*acl) + acl_len;
4413
4414 if (buflen <= PAGE_SIZE) {
4415 acl = kmalloc(buflen, GFP_KERNEL);
4416 if (acl == NULL)
4417 goto out;
4418 acl->cached = 1;
4419 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4420 } else {
4421 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4422 if (acl == NULL)
4423 goto out;
4424 acl->cached = 0;
4425 }
4426 acl->len = acl_len;
4427out:
4428 nfs4_set_cached_acl(inode, acl);
4429}
4430
4431/*
4432 * The getxattr API returns the required buffer length when called with a
4433 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4434 * the required buf. On a NULL buf, we send a page of data to the server
4435 * guessing that the ACL request can be serviced by a page. If so, we cache
4436 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4437 * the cache. If not so, we throw away the page, and cache the required
4438 * length. The next getxattr call will then produce another round trip to
4439 * the server, this time with the input buf of the required size.
4440 */
4441static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4442{
4443 struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4444 struct nfs_getaclargs args = {
4445 .fh = NFS_FH(inode),
4446 .acl_pages = pages,
4447 .acl_len = buflen,
4448 };
4449 struct nfs_getaclres res = {
4450 .acl_len = buflen,
4451 };
4452 struct rpc_message msg = {
4453 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4454 .rpc_argp = &args,
4455 .rpc_resp = &res,
4456 };
4457 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4458 int ret = -ENOMEM, i;
4459
4460 /* As long as we're doing a round trip to the server anyway,
4461 * let's be prepared for a page of acl data. */
4462 if (npages == 0)
4463 npages = 1;
4464 if (npages > ARRAY_SIZE(pages))
4465 return -ERANGE;
4466
4467 for (i = 0; i < npages; i++) {
4468 pages[i] = alloc_page(GFP_KERNEL);
4469 if (!pages[i])
4470 goto out_free;
4471 }
4472
4473 /* for decoding across pages */
4474 res.acl_scratch = alloc_page(GFP_KERNEL);
4475 if (!res.acl_scratch)
4476 goto out_free;
4477
4478 args.acl_len = npages * PAGE_SIZE;
4479 args.acl_pgbase = 0;
4480
4481 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
4482 __func__, buf, buflen, npages, args.acl_len);
4483 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4484 &msg, &args.seq_args, &res.seq_res, 0);
4485 if (ret)
4486 goto out_free;
4487
4488 /* Handle the case where the passed-in buffer is too short */
4489 if (res.acl_flags & NFS4_ACL_TRUNC) {
4490 /* Did the user only issue a request for the acl length? */
4491 if (buf == NULL)
4492 goto out_ok;
4493 ret = -ERANGE;
4494 goto out_free;
4495 }
4496 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4497 if (buf) {
4498 if (res.acl_len > buflen) {
4499 ret = -ERANGE;
4500 goto out_free;
4501 }
4502 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4503 }
4504out_ok:
4505 ret = res.acl_len;
4506out_free:
4507 for (i = 0; i < npages; i++)
4508 if (pages[i])
4509 __free_page(pages[i]);
4510 if (res.acl_scratch)
4511 __free_page(res.acl_scratch);
4512 return ret;
4513}
4514
4515static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4516{
4517 struct nfs4_exception exception = { };
4518 ssize_t ret;
4519 do {
4520 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4521 trace_nfs4_get_acl(inode, ret);
4522 if (ret >= 0)
4523 break;
4524 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4525 } while (exception.retry);
4526 return ret;
4527}
4528
4529static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4530{
4531 struct nfs_server *server = NFS_SERVER(inode);
4532 int ret;
4533
4534 if (!nfs4_server_supports_acls(server))
4535 return -EOPNOTSUPP;
4536 ret = nfs_revalidate_inode(server, inode);
4537 if (ret < 0)
4538 return ret;
4539 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4540 nfs_zap_acl_cache(inode);
4541 ret = nfs4_read_cached_acl(inode, buf, buflen);
4542 if (ret != -ENOENT)
4543 /* -ENOENT is returned if there is no ACL or if there is an ACL
4544 * but no cached acl data, just the acl length */
4545 return ret;
4546 return nfs4_get_acl_uncached(inode, buf, buflen);
4547}
4548
4549static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4550{
4551 struct nfs_server *server = NFS_SERVER(inode);
4552 struct page *pages[NFS4ACL_MAXPAGES];
4553 struct nfs_setaclargs arg = {
4554 .fh = NFS_FH(inode),
4555 .acl_pages = pages,
4556 .acl_len = buflen,
4557 };
4558 struct nfs_setaclres res;
4559 struct rpc_message msg = {
4560 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4561 .rpc_argp = &arg,
4562 .rpc_resp = &res,
4563 };
4564 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4565 int ret, i;
4566
4567 if (!nfs4_server_supports_acls(server))
4568 return -EOPNOTSUPP;
4569 if (npages > ARRAY_SIZE(pages))
4570 return -ERANGE;
4571 i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4572 if (i < 0)
4573 return i;
4574 nfs4_inode_return_delegation(inode);
4575 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4576
4577 /*
4578 * Free each page after tx, so the only ref left is
4579 * held by the network stack
4580 */
4581 for (; i > 0; i--)
4582 put_page(pages[i-1]);
4583
4584 /*
4585 * Acl update can result in inode attribute update.
4586 * so mark the attribute cache invalid.
4587 */
4588 spin_lock(&inode->i_lock);
4589 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4590 spin_unlock(&inode->i_lock);
4591 nfs_access_zap_cache(inode);
4592 nfs_zap_acl_cache(inode);
4593 return ret;
4594}
4595
4596static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4597{
4598 struct nfs4_exception exception = { };
4599 int err;
4600 do {
4601 err = __nfs4_proc_set_acl(inode, buf, buflen);
4602 trace_nfs4_set_acl(inode, err);
4603 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4604 &exception);
4605 } while (exception.retry);
4606 return err;
4607}
4608
4609#ifdef CONFIG_NFS_V4_SECURITY_LABEL
4610static int _nfs4_get_security_label(struct inode *inode, void *buf,
4611 size_t buflen)
4612{
4613 struct nfs_server *server = NFS_SERVER(inode);
4614 struct nfs_fattr fattr;
4615 struct nfs4_label label = {0, 0, buflen, buf};
4616
4617 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4618 struct nfs4_getattr_arg arg = {
4619 .fh = NFS_FH(inode),
4620 .bitmask = bitmask,
4621 };
4622 struct nfs4_getattr_res res = {
4623 .fattr = &fattr,
4624 .label = &label,
4625 .server = server,
4626 };
4627 struct rpc_message msg = {
4628 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4629 .rpc_argp = &arg,
4630 .rpc_resp = &res,
4631 };
4632 int ret;
4633
4634 nfs_fattr_init(&fattr);
4635
4636 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4637 if (ret)
4638 return ret;
4639 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4640 return -ENOENT;
4641 if (buflen < label.len)
4642 return -ERANGE;
4643 return 0;
4644}
4645
4646static int nfs4_get_security_label(struct inode *inode, void *buf,
4647 size_t buflen)
4648{
4649 struct nfs4_exception exception = { };
4650 int err;
4651
4652 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4653 return -EOPNOTSUPP;
4654
4655 do {
4656 err = _nfs4_get_security_label(inode, buf, buflen);
4657 trace_nfs4_get_security_label(inode, err);
4658 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4659 &exception);
4660 } while (exception.retry);
4661 return err;
4662}
4663
4664static int _nfs4_do_set_security_label(struct inode *inode,
4665 struct nfs4_label *ilabel,
4666 struct nfs_fattr *fattr,
4667 struct nfs4_label *olabel)
4668{
4669
4670 struct iattr sattr = {0};
4671 struct nfs_server *server = NFS_SERVER(inode);
4672 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4673 struct nfs_setattrargs arg = {
4674 .fh = NFS_FH(inode),
4675 .iap = &sattr,
4676 .server = server,
4677 .bitmask = bitmask,
4678 .label = ilabel,
4679 };
4680 struct nfs_setattrres res = {
4681 .fattr = fattr,
4682 .label = olabel,
4683 .server = server,
4684 };
4685 struct rpc_message msg = {
4686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4687 .rpc_argp = &arg,
4688 .rpc_resp = &res,
4689 };
4690 int status;
4691
4692 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4693
4694 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4695 if (status)
4696 dprintk("%s failed: %d\n", __func__, status);
4697
4698 return status;
4699}
4700
4701static int nfs4_do_set_security_label(struct inode *inode,
4702 struct nfs4_label *ilabel,
4703 struct nfs_fattr *fattr,
4704 struct nfs4_label *olabel)
4705{
4706 struct nfs4_exception exception = { };
4707 int err;
4708
4709 do {
4710 err = _nfs4_do_set_security_label(inode, ilabel,
4711 fattr, olabel);
4712 trace_nfs4_set_security_label(inode, err);
4713 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4714 &exception);
4715 } while (exception.retry);
4716 return err;
4717}
4718
4719static int
4720nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4721{
4722 struct nfs4_label ilabel, *olabel = NULL;
4723 struct nfs_fattr fattr;
4724 struct rpc_cred *cred;
4725 struct inode *inode = dentry->d_inode;
4726 int status;
4727
4728 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4729 return -EOPNOTSUPP;
4730
4731 nfs_fattr_init(&fattr);
4732
4733 ilabel.pi = 0;
4734 ilabel.lfs = 0;
4735 ilabel.label = (char *)buf;
4736 ilabel.len = buflen;
4737
4738 cred = rpc_lookup_cred();
4739 if (IS_ERR(cred))
4740 return PTR_ERR(cred);
4741
4742 olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4743 if (IS_ERR(olabel)) {
4744 status = -PTR_ERR(olabel);
4745 goto out;
4746 }
4747
4748 status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4749 if (status == 0)
4750 nfs_setsecurity(inode, &fattr, olabel);
4751
4752 nfs4_label_free(olabel);
4753out:
4754 put_rpccred(cred);
4755 return status;
4756}
4757#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
4758
4759
4760static int
4761nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4762{
4763 struct nfs_client *clp = server->nfs_client;
4764
4765 if (task->tk_status >= 0)
4766 return 0;
4767 switch(task->tk_status) {
4768 case -NFS4ERR_DELEG_REVOKED:
4769 case -NFS4ERR_ADMIN_REVOKED:
4770 case -NFS4ERR_BAD_STATEID:
4771 if (state == NULL)
4772 break;
4773 nfs_remove_bad_delegation(state->inode);
4774 case -NFS4ERR_OPENMODE:
4775 if (state == NULL)
4776 break;
4777 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4778 goto recovery_failed;
4779 goto wait_on_recovery;
4780 case -NFS4ERR_EXPIRED:
4781 if (state != NULL) {
4782 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4783 goto recovery_failed;
4784 }
4785 case -NFS4ERR_STALE_STATEID:
4786 case -NFS4ERR_STALE_CLIENTID:
4787 nfs4_schedule_lease_recovery(clp);
4788 goto wait_on_recovery;
4789 case -NFS4ERR_MOVED:
4790 if (nfs4_schedule_migration_recovery(server) < 0)
4791 goto recovery_failed;
4792 goto wait_on_recovery;
4793 case -NFS4ERR_LEASE_MOVED:
4794 nfs4_schedule_lease_moved_recovery(clp);
4795 goto wait_on_recovery;
4796#if defined(CONFIG_NFS_V4_1)
4797 case -NFS4ERR_BADSESSION:
4798 case -NFS4ERR_BADSLOT:
4799 case -NFS4ERR_BAD_HIGH_SLOT:
4800 case -NFS4ERR_DEADSESSION:
4801 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4802 case -NFS4ERR_SEQ_FALSE_RETRY:
4803 case -NFS4ERR_SEQ_MISORDERED:
4804 dprintk("%s ERROR %d, Reset session\n", __func__,
4805 task->tk_status);
4806 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4807 goto wait_on_recovery;
4808#endif /* CONFIG_NFS_V4_1 */
4809 case -NFS4ERR_DELAY:
4810 nfs_inc_server_stats(server, NFSIOS_DELAY);
4811 case -NFS4ERR_GRACE:
4812 rpc_delay(task, NFS4_POLL_RETRY_MAX);
4813 case -NFS4ERR_RETRY_UNCACHED_REP:
4814 case -NFS4ERR_OLD_STATEID:
4815 goto restart_call;
4816 }
4817 task->tk_status = nfs4_map_errors(task->tk_status);
4818 return 0;
4819recovery_failed:
4820 task->tk_status = -EIO;
4821 return 0;
4822wait_on_recovery:
4823 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4824 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4825 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4826 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4827 goto recovery_failed;
4828restart_call:
4829 task->tk_status = 0;
4830 return -EAGAIN;
4831}
4832
4833static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4834 nfs4_verifier *bootverf)
4835{
4836 __be32 verf[2];
4837
4838 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4839 /* An impossible timestamp guarantees this value
4840 * will never match a generated boot time. */
4841 verf[0] = 0;
4842 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4843 } else {
4844 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4845 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4846 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4847 }
4848 memcpy(bootverf->data, verf, sizeof(bootverf->data));
4849}
4850
4851static unsigned int
4852nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4853 char *buf, size_t len)
4854{
4855 unsigned int result;
4856
4857 rcu_read_lock();
4858 result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4859 clp->cl_ipaddr,
4860 rpc_peeraddr2str(clp->cl_rpcclient,
4861 RPC_DISPLAY_ADDR),
4862 rpc_peeraddr2str(clp->cl_rpcclient,
4863 RPC_DISPLAY_PROTO));
4864 rcu_read_unlock();
4865 return result;
4866}
4867
4868static unsigned int
4869nfs4_init_uniform_client_string(const struct nfs_client *clp,
4870 char *buf, size_t len)
4871{
4872 const char *nodename = clp->cl_rpcclient->cl_nodename;
4873
4874 if (nfs4_client_id_uniquifier[0] != '\0')
4875 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4876 clp->rpc_ops->version,
4877 clp->cl_minorversion,
4878 nfs4_client_id_uniquifier,
4879 nodename);
4880 return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4881 clp->rpc_ops->version, clp->cl_minorversion,
4882 nodename);
4883}
4884
4885/*
4886 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4887 * services. Advertise one based on the address family of the
4888 * clientaddr.
4889 */
4890static unsigned int
4891nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4892{
4893 if (strchr(clp->cl_ipaddr, ':') != NULL)
4894 return scnprintf(buf, len, "tcp6");
4895 else
4896 return scnprintf(buf, len, "tcp");
4897}
4898
4899/**
4900 * nfs4_proc_setclientid - Negotiate client ID
4901 * @clp: state data structure
4902 * @program: RPC program for NFSv4 callback service
4903 * @port: IP port number for NFS4 callback service
4904 * @cred: RPC credential to use for this call
4905 * @res: where to place the result
4906 *
4907 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4908 */
4909int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4910 unsigned short port, struct rpc_cred *cred,
4911 struct nfs4_setclientid_res *res)
4912{
4913 nfs4_verifier sc_verifier;
4914 struct nfs4_setclientid setclientid = {
4915 .sc_verifier = &sc_verifier,
4916 .sc_prog = program,
4917 .sc_cb_ident = clp->cl_cb_ident,
4918 };
4919 struct rpc_message msg = {
4920 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4921 .rpc_argp = &setclientid,
4922 .rpc_resp = res,
4923 .rpc_cred = cred,
4924 };
4925 int status;
4926
4927 /* nfs_client_id4 */
4928 nfs4_init_boot_verifier(clp, &sc_verifier);
4929 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4930 setclientid.sc_name_len =
4931 nfs4_init_uniform_client_string(clp,
4932 setclientid.sc_name,
4933 sizeof(setclientid.sc_name));
4934 else
4935 setclientid.sc_name_len =
4936 nfs4_init_nonuniform_client_string(clp,
4937 setclientid.sc_name,
4938 sizeof(setclientid.sc_name));
4939 /* cb_client4 */
4940 setclientid.sc_netid_len =
4941 nfs4_init_callback_netid(clp,
4942 setclientid.sc_netid,
4943 sizeof(setclientid.sc_netid));
4944 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4945 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4946 clp->cl_ipaddr, port >> 8, port & 255);
4947
4948 dprintk("NFS call setclientid auth=%s, '%.*s'\n",
4949 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4950 setclientid.sc_name_len, setclientid.sc_name);
4951 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4952 trace_nfs4_setclientid(clp, status);
4953 dprintk("NFS reply setclientid: %d\n", status);
4954 return status;
4955}
4956
4957/**
4958 * nfs4_proc_setclientid_confirm - Confirm client ID
4959 * @clp: state data structure
4960 * @res: result of a previous SETCLIENTID
4961 * @cred: RPC credential to use for this call
4962 *
4963 * Returns zero, a negative errno, or a negative NFS4ERR status code.
4964 */
4965int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4966 struct nfs4_setclientid_res *arg,
4967 struct rpc_cred *cred)
4968{
4969 struct rpc_message msg = {
4970 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4971 .rpc_argp = arg,
4972 .rpc_cred = cred,
4973 };
4974 int status;
4975
4976 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
4977 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4978 clp->cl_clientid);
4979 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4980 trace_nfs4_setclientid_confirm(clp, status);
4981 dprintk("NFS reply setclientid_confirm: %d\n", status);
4982 return status;
4983}
4984
4985struct nfs4_delegreturndata {
4986 struct nfs4_delegreturnargs args;
4987 struct nfs4_delegreturnres res;
4988 struct nfs_fh fh;
4989 nfs4_stateid stateid;
4990 unsigned long timestamp;
4991 struct nfs_fattr fattr;
4992 int rpc_status;
4993};
4994
4995static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4996{
4997 struct nfs4_delegreturndata *data = calldata;
4998
4999 if (!nfs4_sequence_done(task, &data->res.seq_res))
5000 return;
5001
5002 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5003 switch (task->tk_status) {
5004 case 0:
5005 renew_lease(data->res.server, data->timestamp);
5006 break;
5007 case -NFS4ERR_ADMIN_REVOKED:
5008 case -NFS4ERR_DELEG_REVOKED:
5009 case -NFS4ERR_BAD_STATEID:
5010 case -NFS4ERR_OLD_STATEID:
5011 case -NFS4ERR_STALE_STATEID:
5012 case -NFS4ERR_EXPIRED:
5013 task->tk_status = 0;
5014 break;
5015 default:
5016 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5017 -EAGAIN) {
5018 rpc_restart_call_prepare(task);
5019 return;
5020 }
5021 }
5022 data->rpc_status = task->tk_status;
5023}
5024
5025static void nfs4_delegreturn_release(void *calldata)
5026{
5027 kfree(calldata);
5028}
5029
5030static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5031{
5032 struct nfs4_delegreturndata *d_data;
5033
5034 d_data = (struct nfs4_delegreturndata *)data;
5035
5036 nfs4_setup_sequence(d_data->res.server,
5037 &d_data->args.seq_args,
5038 &d_data->res.seq_res,
5039 task);
5040}
5041
5042static const struct rpc_call_ops nfs4_delegreturn_ops = {
5043 .rpc_call_prepare = nfs4_delegreturn_prepare,
5044 .rpc_call_done = nfs4_delegreturn_done,
5045 .rpc_release = nfs4_delegreturn_release,
5046};
5047
5048static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5049{
5050 struct nfs4_delegreturndata *data;
5051 struct nfs_server *server = NFS_SERVER(inode);
5052 struct rpc_task *task;
5053 struct rpc_message msg = {
5054 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5055 .rpc_cred = cred,
5056 };
5057 struct rpc_task_setup task_setup_data = {
5058 .rpc_client = server->client,
5059 .rpc_message = &msg,
5060 .callback_ops = &nfs4_delegreturn_ops,
5061 .flags = RPC_TASK_ASYNC,
5062 };
5063 int status = 0;
5064
5065 data = kzalloc(sizeof(*data), GFP_NOFS);
5066 if (data == NULL)
5067 return -ENOMEM;
5068 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5069 data->args.fhandle = &data->fh;
5070 data->args.stateid = &data->stateid;
5071 data->args.bitmask = server->cache_consistency_bitmask;
5072 nfs_copy_fh(&data->fh, NFS_FH(inode));
5073 nfs4_stateid_copy(&data->stateid, stateid);
5074 data->res.fattr = &data->fattr;
5075 data->res.server = server;
5076 nfs_fattr_init(data->res.fattr);
5077 data->timestamp = jiffies;
5078 data->rpc_status = 0;
5079
5080 task_setup_data.callback_data = data;
5081 msg.rpc_argp = &data->args;
5082 msg.rpc_resp = &data->res;
5083 task = rpc_run_task(&task_setup_data);
5084 if (IS_ERR(task))
5085 return PTR_ERR(task);
5086 if (!issync)
5087 goto out;
5088 status = nfs4_wait_for_completion_rpc_task(task);
5089 if (status != 0)
5090 goto out;
5091 status = data->rpc_status;
5092 if (status == 0)
5093 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5094 else
5095 nfs_refresh_inode(inode, &data->fattr);
5096out:
5097 rpc_put_task(task);
5098 return status;
5099}
5100
5101int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5102{
5103 struct nfs_server *server = NFS_SERVER(inode);
5104 struct nfs4_exception exception = { };
5105 int err;
5106 do {
5107 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5108 trace_nfs4_delegreturn(inode, err);
5109 switch (err) {
5110 case -NFS4ERR_STALE_STATEID:
5111 case -NFS4ERR_EXPIRED:
5112 case 0:
5113 return 0;
5114 }
5115 err = nfs4_handle_exception(server, err, &exception);
5116 } while (exception.retry);
5117 return err;
5118}
5119
5120#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5121#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5122
5123/*
5124 * sleep, with exponential backoff, and retry the LOCK operation.
5125 */
5126static unsigned long
5127nfs4_set_lock_task_retry(unsigned long timeout)
5128{
5129 freezable_schedule_timeout_killable_unsafe(timeout);
5130 timeout <<= 1;
5131 if (timeout > NFS4_LOCK_MAXTIMEOUT)
5132 return NFS4_LOCK_MAXTIMEOUT;
5133 return timeout;
5134}
5135
5136static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5137{
5138 struct inode *inode = state->inode;
5139 struct nfs_server *server = NFS_SERVER(inode);
5140 struct nfs_client *clp = server->nfs_client;
5141 struct nfs_lockt_args arg = {
5142 .fh = NFS_FH(inode),
5143 .fl = request,
5144 };
5145 struct nfs_lockt_res res = {
5146 .denied = request,
5147 };
5148 struct rpc_message msg = {
5149 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5150 .rpc_argp = &arg,
5151 .rpc_resp = &res,
5152 .rpc_cred = state->owner->so_cred,
5153 };
5154 struct nfs4_lock_state *lsp;
5155 int status;
5156
5157 arg.lock_owner.clientid = clp->cl_clientid;
5158 status = nfs4_set_lock_state(state, request);
5159 if (status != 0)
5160 goto out;
5161 lsp = request->fl_u.nfs4_fl.owner;
5162 arg.lock_owner.id = lsp->ls_seqid.owner_id;
5163 arg.lock_owner.s_dev = server->s_dev;
5164 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5165 switch (status) {
5166 case 0:
5167 request->fl_type = F_UNLCK;
5168 break;
5169 case -NFS4ERR_DENIED:
5170 status = 0;
5171 }
5172 request->fl_ops->fl_release_private(request);
5173 request->fl_ops = NULL;
5174out:
5175 return status;
5176}
5177
5178static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5179{
5180 struct nfs4_exception exception = { };
5181 int err;
5182
5183 do {
5184 err = _nfs4_proc_getlk(state, cmd, request);
5185 trace_nfs4_get_lock(request, state, cmd, err);
5186 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5187 &exception);
5188 } while (exception.retry);
5189 return err;
5190}
5191
5192static int do_vfs_lock(struct file *file, struct file_lock *fl)
5193{
5194 int res = 0;
5195 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5196 case FL_POSIX:
5197 res = posix_lock_file_wait(file, fl);
5198 break;
5199 case FL_FLOCK:
5200 res = flock_lock_file_wait(file, fl);
5201 break;
5202 default:
5203 BUG();
5204 }
5205 return res;
5206}
5207
5208struct nfs4_unlockdata {
5209 struct nfs_locku_args arg;
5210 struct nfs_locku_res res;
5211 struct nfs4_lock_state *lsp;
5212 struct nfs_open_context *ctx;
5213 struct file_lock fl;
5214 const struct nfs_server *server;
5215 unsigned long timestamp;
5216};
5217
5218static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5219 struct nfs_open_context *ctx,
5220 struct nfs4_lock_state *lsp,
5221 struct nfs_seqid *seqid)
5222{
5223 struct nfs4_unlockdata *p;
5224 struct inode *inode = lsp->ls_state->inode;
5225
5226 p = kzalloc(sizeof(*p), GFP_NOFS);
5227 if (p == NULL)
5228 return NULL;
5229 p->arg.fh = NFS_FH(inode);
5230 p->arg.fl = &p->fl;
5231 p->arg.seqid = seqid;
5232 p->res.seqid = seqid;
5233 p->arg.stateid = &lsp->ls_stateid;
5234 p->lsp = lsp;
5235 atomic_inc(&lsp->ls_count);
5236 /* Ensure we don't close file until we're done freeing locks! */
5237 p->ctx = get_nfs_open_context(ctx);
5238 memcpy(&p->fl, fl, sizeof(p->fl));
5239 p->server = NFS_SERVER(inode);
5240 return p;
5241}
5242
5243static void nfs4_locku_release_calldata(void *data)
5244{
5245 struct nfs4_unlockdata *calldata = data;
5246 nfs_free_seqid(calldata->arg.seqid);
5247 nfs4_put_lock_state(calldata->lsp);
5248 put_nfs_open_context(calldata->ctx);
5249 kfree(calldata);
5250}
5251
5252static void nfs4_locku_done(struct rpc_task *task, void *data)
5253{
5254 struct nfs4_unlockdata *calldata = data;
5255
5256 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5257 return;
5258 switch (task->tk_status) {
5259 case 0:
5260 nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5261 &calldata->res.stateid);
5262 renew_lease(calldata->server, calldata->timestamp);
5263 break;
5264 case -NFS4ERR_BAD_STATEID:
5265 case -NFS4ERR_OLD_STATEID:
5266 case -NFS4ERR_STALE_STATEID:
5267 case -NFS4ERR_EXPIRED:
5268 break;
5269 default:
5270 if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5271 rpc_restart_call_prepare(task);
5272 }
5273 nfs_release_seqid(calldata->arg.seqid);
5274}
5275
5276static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5277{
5278 struct nfs4_unlockdata *calldata = data;
5279
5280 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5281 goto out_wait;
5282 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5283 /* Note: exit _without_ running nfs4_locku_done */
5284 goto out_no_action;
5285 }
5286 calldata->timestamp = jiffies;
5287 if (nfs4_setup_sequence(calldata->server,
5288 &calldata->arg.seq_args,
5289 &calldata->res.seq_res,
5290 task) != 0)
5291 nfs_release_seqid(calldata->arg.seqid);
5292 return;
5293out_no_action:
5294 task->tk_action = NULL;
5295out_wait:
5296 nfs4_sequence_done(task, &calldata->res.seq_res);
5297}
5298
5299static const struct rpc_call_ops nfs4_locku_ops = {
5300 .rpc_call_prepare = nfs4_locku_prepare,
5301 .rpc_call_done = nfs4_locku_done,
5302 .rpc_release = nfs4_locku_release_calldata,
5303};
5304
5305static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5306 struct nfs_open_context *ctx,
5307 struct nfs4_lock_state *lsp,
5308 struct nfs_seqid *seqid)
5309{
5310 struct nfs4_unlockdata *data;
5311 struct rpc_message msg = {
5312 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5313 .rpc_cred = ctx->cred,
5314 };
5315 struct rpc_task_setup task_setup_data = {
5316 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5317 .rpc_message = &msg,
5318 .callback_ops = &nfs4_locku_ops,
5319 .workqueue = nfsiod_workqueue,
5320 .flags = RPC_TASK_ASYNC,
5321 };
5322
5323 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5324 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5325
5326 /* Ensure this is an unlock - when canceling a lock, the
5327 * canceled lock is passed in, and it won't be an unlock.
5328 */
5329 fl->fl_type = F_UNLCK;
5330
5331 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5332 if (data == NULL) {
5333 nfs_free_seqid(seqid);
5334 return ERR_PTR(-ENOMEM);
5335 }
5336
5337 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5338 msg.rpc_argp = &data->arg;
5339 msg.rpc_resp = &data->res;
5340 task_setup_data.callback_data = data;
5341 return rpc_run_task(&task_setup_data);
5342}
5343
5344static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5345{
5346 struct inode *inode = state->inode;
5347 struct nfs4_state_owner *sp = state->owner;
5348 struct nfs_inode *nfsi = NFS_I(inode);
5349 struct nfs_seqid *seqid;
5350 struct nfs4_lock_state *lsp;
5351 struct rpc_task *task;
5352 int status = 0;
5353 unsigned char fl_flags = request->fl_flags;
5354
5355 status = nfs4_set_lock_state(state, request);
5356 /* Unlock _before_ we do the RPC call */
5357 request->fl_flags |= FL_EXISTS;
5358 /* Exclude nfs_delegation_claim_locks() */
5359 mutex_lock(&sp->so_delegreturn_mutex);
5360 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5361 down_read(&nfsi->rwsem);
5362 if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5363 up_read(&nfsi->rwsem);
5364 mutex_unlock(&sp->so_delegreturn_mutex);
5365 goto out;
5366 }
5367 up_read(&nfsi->rwsem);
5368 mutex_unlock(&sp->so_delegreturn_mutex);
5369 if (status != 0)
5370 goto out;
5371 /* Is this a delegated lock? */
5372 lsp = request->fl_u.nfs4_fl.owner;
5373 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5374 goto out;
5375 seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5376 status = -ENOMEM;
5377 if (seqid == NULL)
5378 goto out;
5379 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5380 status = PTR_ERR(task);
5381 if (IS_ERR(task))
5382 goto out;
5383 status = nfs4_wait_for_completion_rpc_task(task);
5384 rpc_put_task(task);
5385out:
5386 request->fl_flags = fl_flags;
5387 trace_nfs4_unlock(request, state, F_SETLK, status);
5388 return status;
5389}
5390
5391struct nfs4_lockdata {
5392 struct nfs_lock_args arg;
5393 struct nfs_lock_res res;
5394 struct nfs4_lock_state *lsp;
5395 struct nfs_open_context *ctx;
5396 struct file_lock fl;
5397 unsigned long timestamp;
5398 int rpc_status;
5399 int cancelled;
5400 struct nfs_server *server;
5401};
5402
5403static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5404 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5405 gfp_t gfp_mask)
5406{
5407 struct nfs4_lockdata *p;
5408 struct inode *inode = lsp->ls_state->inode;
5409 struct nfs_server *server = NFS_SERVER(inode);
5410
5411 p = kzalloc(sizeof(*p), gfp_mask);
5412 if (p == NULL)
5413 return NULL;
5414
5415 p->arg.fh = NFS_FH(inode);
5416 p->arg.fl = &p->fl;
5417 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5418 if (p->arg.open_seqid == NULL)
5419 goto out_free;
5420 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5421 if (p->arg.lock_seqid == NULL)
5422 goto out_free_seqid;
5423 p->arg.lock_stateid = &lsp->ls_stateid;
5424 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5425 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5426 p->arg.lock_owner.s_dev = server->s_dev;
5427 p->res.lock_seqid = p->arg.lock_seqid;
5428 p->lsp = lsp;
5429 p->server = server;
5430 atomic_inc(&lsp->ls_count);
5431 p->ctx = get_nfs_open_context(ctx);
5432 memcpy(&p->fl, fl, sizeof(p->fl));
5433 return p;
5434out_free_seqid:
5435 nfs_free_seqid(p->arg.open_seqid);
5436out_free:
5437 kfree(p);
5438 return NULL;
5439}
5440
5441static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5442{
5443 struct nfs4_lockdata *data = calldata;
5444 struct nfs4_state *state = data->lsp->ls_state;
5445
5446 dprintk("%s: begin!\n", __func__);
5447 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5448 goto out_wait;
5449 /* Do we need to do an open_to_lock_owner? */
5450 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5451 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5452 goto out_release_lock_seqid;
5453 }
5454 data->arg.open_stateid = &state->open_stateid;
5455 data->arg.new_lock_owner = 1;
5456 data->res.open_seqid = data->arg.open_seqid;
5457 } else
5458 data->arg.new_lock_owner = 0;
5459 if (!nfs4_valid_open_stateid(state)) {
5460 data->rpc_status = -EBADF;
5461 task->tk_action = NULL;
5462 goto out_release_open_seqid;
5463 }
5464 data->timestamp = jiffies;
5465 if (nfs4_setup_sequence(data->server,
5466 &data->arg.seq_args,
5467 &data->res.seq_res,
5468 task) == 0)
5469 return;
5470out_release_open_seqid:
5471 nfs_release_seqid(data->arg.open_seqid);
5472out_release_lock_seqid:
5473 nfs_release_seqid(data->arg.lock_seqid);
5474out_wait:
5475 nfs4_sequence_done(task, &data->res.seq_res);
5476 dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5477}
5478
5479static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5480{
5481 struct nfs4_lockdata *data = calldata;
5482
5483 dprintk("%s: begin!\n", __func__);
5484
5485 if (!nfs4_sequence_done(task, &data->res.seq_res))
5486 return;
5487
5488 data->rpc_status = task->tk_status;
5489 if (data->arg.new_lock_owner != 0) {
5490 if (data->rpc_status == 0)
5491 nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5492 else
5493 goto out;
5494 }
5495 if (data->rpc_status == 0) {
5496 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5497 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5498 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5499 }
5500out:
5501 dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5502}
5503
5504static void nfs4_lock_release(void *calldata)
5505{
5506 struct nfs4_lockdata *data = calldata;
5507
5508 dprintk("%s: begin!\n", __func__);
5509 nfs_free_seqid(data->arg.open_seqid);
5510 if (data->cancelled != 0) {
5511 struct rpc_task *task;
5512 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5513 data->arg.lock_seqid);
5514 if (!IS_ERR(task))
5515 rpc_put_task_async(task);
5516 dprintk("%s: cancelling lock!\n", __func__);
5517 } else
5518 nfs_free_seqid(data->arg.lock_seqid);
5519 nfs4_put_lock_state(data->lsp);
5520 put_nfs_open_context(data->ctx);
5521 kfree(data);
5522 dprintk("%s: done!\n", __func__);
5523}
5524
5525static const struct rpc_call_ops nfs4_lock_ops = {
5526 .rpc_call_prepare = nfs4_lock_prepare,
5527 .rpc_call_done = nfs4_lock_done,
5528 .rpc_release = nfs4_lock_release,
5529};
5530
5531static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5532{
5533 switch (error) {
5534 case -NFS4ERR_ADMIN_REVOKED:
5535 case -NFS4ERR_BAD_STATEID:
5536 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5537 if (new_lock_owner != 0 ||
5538 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5539 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5540 break;
5541 case -NFS4ERR_STALE_STATEID:
5542 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5543 case -NFS4ERR_EXPIRED:
5544 nfs4_schedule_lease_recovery(server->nfs_client);
5545 };
5546}
5547
5548static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5549{
5550 struct nfs4_lockdata *data;
5551 struct rpc_task *task;
5552 struct rpc_message msg = {
5553 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5554 .rpc_cred = state->owner->so_cred,
5555 };
5556 struct rpc_task_setup task_setup_data = {
5557 .rpc_client = NFS_CLIENT(state->inode),
5558 .rpc_message = &msg,
5559 .callback_ops = &nfs4_lock_ops,
5560 .workqueue = nfsiod_workqueue,
5561 .flags = RPC_TASK_ASYNC,
5562 };
5563 int ret;
5564
5565 dprintk("%s: begin!\n", __func__);
5566 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5567 fl->fl_u.nfs4_fl.owner,
5568 recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5569 if (data == NULL)
5570 return -ENOMEM;
5571 if (IS_SETLKW(cmd))
5572 data->arg.block = 1;
5573 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5574 msg.rpc_argp = &data->arg;
5575 msg.rpc_resp = &data->res;
5576 task_setup_data.callback_data = data;
5577 if (recovery_type > NFS_LOCK_NEW) {
5578 if (recovery_type == NFS_LOCK_RECLAIM)
5579 data->arg.reclaim = NFS_LOCK_RECLAIM;
5580 nfs4_set_sequence_privileged(&data->arg.seq_args);
5581 }
5582 task = rpc_run_task(&task_setup_data);
5583 if (IS_ERR(task))
5584 return PTR_ERR(task);
5585 ret = nfs4_wait_for_completion_rpc_task(task);
5586 if (ret == 0) {
5587 ret = data->rpc_status;
5588 if (ret)
5589 nfs4_handle_setlk_error(data->server, data->lsp,
5590 data->arg.new_lock_owner, ret);
5591 } else
5592 data->cancelled = 1;
5593 rpc_put_task(task);
5594 dprintk("%s: done, ret = %d!\n", __func__, ret);
5595 return ret;
5596}
5597
5598static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5599{
5600 struct nfs_server *server = NFS_SERVER(state->inode);
5601 struct nfs4_exception exception = {
5602 .inode = state->inode,
5603 };
5604 int err;
5605
5606 do {
5607 /* Cache the lock if possible... */
5608 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5609 return 0;
5610 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5611 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5612 if (err != -NFS4ERR_DELAY)
5613 break;
5614 nfs4_handle_exception(server, err, &exception);
5615 } while (exception.retry);
5616 return err;
5617}
5618
5619static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5620{
5621 struct nfs_server *server = NFS_SERVER(state->inode);
5622 struct nfs4_exception exception = {
5623 .inode = state->inode,
5624 };
5625 int err;
5626
5627 err = nfs4_set_lock_state(state, request);
5628 if (err != 0)
5629 return err;
5630 if (!recover_lost_locks) {
5631 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5632 return 0;
5633 }
5634 do {
5635 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5636 return 0;
5637 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5638 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5639 switch (err) {
5640 default:
5641 goto out;
5642 case -NFS4ERR_GRACE:
5643 case -NFS4ERR_DELAY:
5644 nfs4_handle_exception(server, err, &exception);
5645 err = 0;
5646 }
5647 } while (exception.retry);
5648out:
5649 return err;
5650}
5651
5652#if defined(CONFIG_NFS_V4_1)
5653/**
5654 * nfs41_check_expired_locks - possibly free a lock stateid
5655 *
5656 * @state: NFSv4 state for an inode
5657 *
5658 * Returns NFS_OK if recovery for this stateid is now finished.
5659 * Otherwise a negative NFS4ERR value is returned.
5660 */
5661static int nfs41_check_expired_locks(struct nfs4_state *state)
5662{
5663 int status, ret = -NFS4ERR_BAD_STATEID;
5664 struct nfs4_lock_state *lsp;
5665 struct nfs_server *server = NFS_SERVER(state->inode);
5666
5667 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5668 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5669 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5670
5671 status = nfs41_test_stateid(server,
5672 &lsp->ls_stateid,
5673 cred);
5674 trace_nfs4_test_lock_stateid(state, lsp, status);
5675 if (status != NFS_OK) {
5676 /* Free the stateid unless the server
5677 * informs us the stateid is unrecognized. */
5678 if (status != -NFS4ERR_BAD_STATEID)
5679 nfs41_free_stateid(server,
5680 &lsp->ls_stateid,
5681 cred);
5682 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5683 ret = status;
5684 }
5685 }
5686 };
5687
5688 return ret;
5689}
5690
5691static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5692{
5693 int status = NFS_OK;
5694
5695 if (test_bit(LK_STATE_IN_USE, &state->flags))
5696 status = nfs41_check_expired_locks(state);
5697 if (status != NFS_OK)
5698 status = nfs4_lock_expired(state, request);
5699 return status;
5700}
5701#endif
5702
5703static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5704{
5705 struct nfs4_state_owner *sp = state->owner;
5706 struct nfs_inode *nfsi = NFS_I(state->inode);
5707 unsigned char fl_flags = request->fl_flags;
5708 unsigned int seq;
5709 int status = -ENOLCK;
5710
5711 if ((fl_flags & FL_POSIX) &&
5712 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5713 goto out;
5714 /* Is this a delegated open? */
5715 status = nfs4_set_lock_state(state, request);
5716 if (status != 0)
5717 goto out;
5718 request->fl_flags |= FL_ACCESS;
5719 status = do_vfs_lock(request->fl_file, request);
5720 if (status < 0)
5721 goto out;
5722 down_read(&nfsi->rwsem);
5723 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5724 /* Yes: cache locks! */
5725 /* ...but avoid races with delegation recall... */
5726 request->fl_flags = fl_flags & ~FL_SLEEP;
5727 status = do_vfs_lock(request->fl_file, request);
5728 goto out_unlock;
5729 }
5730 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5731 up_read(&nfsi->rwsem);
5732 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5733 if (status != 0)
5734 goto out;
5735 down_read(&nfsi->rwsem);
5736 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5737 status = -NFS4ERR_DELAY;
5738 goto out_unlock;
5739 }
5740 /* Note: we always want to sleep here! */
5741 request->fl_flags = fl_flags | FL_SLEEP;
5742 if (do_vfs_lock(request->fl_file, request) < 0)
5743 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5744 "manager!\n", __func__);
5745out_unlock:
5746 up_read(&nfsi->rwsem);
5747out:
5748 request->fl_flags = fl_flags;
5749 return status;
5750}
5751
5752static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5753{
5754 struct nfs4_exception exception = {
5755 .state = state,
5756 .inode = state->inode,
5757 };
5758 int err;
5759
5760 do {
5761 err = _nfs4_proc_setlk(state, cmd, request);
5762 trace_nfs4_set_lock(request, state, cmd, err);
5763 if (err == -NFS4ERR_DENIED)
5764 err = -EAGAIN;
5765 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5766 err, &exception);
5767 } while (exception.retry);
5768 return err;
5769}
5770
5771static int
5772nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5773{
5774 struct nfs_open_context *ctx;
5775 struct nfs4_state *state;
5776 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5777 int status;
5778
5779 /* verify open state */
5780 ctx = nfs_file_open_context(filp);
5781 state = ctx->state;
5782
5783 if (request->fl_start < 0 || request->fl_end < 0)
5784 return -EINVAL;
5785
5786 if (IS_GETLK(cmd)) {
5787 if (state != NULL)
5788 return nfs4_proc_getlk(state, F_GETLK, request);
5789 return 0;
5790 }
5791
5792 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5793 return -EINVAL;
5794
5795 if (request->fl_type == F_UNLCK) {
5796 if (state != NULL)
5797 return nfs4_proc_unlck(state, cmd, request);
5798 return 0;
5799 }
5800
5801 if (state == NULL)
5802 return -ENOLCK;
5803 /*
5804 * Don't rely on the VFS having checked the file open mode,
5805 * since it won't do this for flock() locks.
5806 */
5807 switch (request->fl_type) {
5808 case F_RDLCK:
5809 if (!(filp->f_mode & FMODE_READ))
5810 return -EBADF;
5811 break;
5812 case F_WRLCK:
5813 if (!(filp->f_mode & FMODE_WRITE))
5814 return -EBADF;
5815 }
5816
5817 do {
5818 status = nfs4_proc_setlk(state, cmd, request);
5819 if ((status != -EAGAIN) || IS_SETLK(cmd))
5820 break;
5821 timeout = nfs4_set_lock_task_retry(timeout);
5822 status = -ERESTARTSYS;
5823 if (signalled())
5824 break;
5825 } while(status < 0);
5826 return status;
5827}
5828
5829int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5830{
5831 struct nfs_server *server = NFS_SERVER(state->inode);
5832 int err;
5833
5834 err = nfs4_set_lock_state(state, fl);
5835 if (err != 0)
5836 return err;
5837 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5838 return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5839}
5840
5841struct nfs_release_lockowner_data {
5842 struct nfs4_lock_state *lsp;
5843 struct nfs_server *server;
5844 struct nfs_release_lockowner_args args;
5845 struct nfs_release_lockowner_res res;
5846 unsigned long timestamp;
5847};
5848
5849static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5850{
5851 struct nfs_release_lockowner_data *data = calldata;
5852 nfs40_setup_sequence(data->server,
5853 &data->args.seq_args, &data->res.seq_res, task);
5854 data->timestamp = jiffies;
5855}
5856
5857static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5858{
5859 struct nfs_release_lockowner_data *data = calldata;
5860 struct nfs_server *server = data->server;
5861
5862 nfs40_sequence_done(task, &data->res.seq_res);
5863
5864 switch (task->tk_status) {
5865 case 0:
5866 renew_lease(server, data->timestamp);
5867 break;
5868 case -NFS4ERR_STALE_CLIENTID:
5869 case -NFS4ERR_EXPIRED:
5870 case -NFS4ERR_LEASE_MOVED:
5871 case -NFS4ERR_DELAY:
5872 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5873 rpc_restart_call_prepare(task);
5874 }
5875}
5876
5877static void nfs4_release_lockowner_release(void *calldata)
5878{
5879 struct nfs_release_lockowner_data *data = calldata;
5880 nfs4_free_lock_state(data->server, data->lsp);
5881 kfree(calldata);
5882}
5883
5884static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5885 .rpc_call_prepare = nfs4_release_lockowner_prepare,
5886 .rpc_call_done = nfs4_release_lockowner_done,
5887 .rpc_release = nfs4_release_lockowner_release,
5888};
5889
5890static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5891{
5892 struct nfs_release_lockowner_data *data;
5893 struct rpc_message msg = {
5894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5895 };
5896
5897 if (server->nfs_client->cl_mvops->minor_version != 0)
5898 return -EINVAL;
5899
5900 data = kmalloc(sizeof(*data), GFP_NOFS);
5901 if (!data)
5902 return -ENOMEM;
5903 data->lsp = lsp;
5904 data->server = server;
5905 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5906 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5907 data->args.lock_owner.s_dev = server->s_dev;
5908
5909 msg.rpc_argp = &data->args;
5910 msg.rpc_resp = &data->res;
5911 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
5912 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5913 return 0;
5914}
5915
5916#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5917
5918static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5919 const void *buf, size_t buflen,
5920 int flags, int type)
5921{
5922 if (strcmp(key, "") != 0)
5923 return -EINVAL;
5924
5925 return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5926}
5927
5928static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5929 void *buf, size_t buflen, int type)
5930{
5931 if (strcmp(key, "") != 0)
5932 return -EINVAL;
5933
5934 return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5935}
5936
5937static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5938 size_t list_len, const char *name,
5939 size_t name_len, int type)
5940{
5941 size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5942
5943 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5944 return 0;
5945
5946 if (list && len <= list_len)
5947 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5948 return len;
5949}
5950
5951#ifdef CONFIG_NFS_V4_SECURITY_LABEL
5952static inline int nfs4_server_supports_labels(struct nfs_server *server)
5953{
5954 return server->caps & NFS_CAP_SECURITY_LABEL;
5955}
5956
5957static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5958 const void *buf, size_t buflen,
5959 int flags, int type)
5960{
5961 if (security_ismaclabel(key))
5962 return nfs4_set_security_label(dentry, buf, buflen);
5963
5964 return -EOPNOTSUPP;
5965}
5966
5967static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5968 void *buf, size_t buflen, int type)
5969{
5970 if (security_ismaclabel(key))
5971 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5972 return -EOPNOTSUPP;
5973}
5974
5975static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5976 size_t list_len, const char *name,
5977 size_t name_len, int type)
5978{
5979 size_t len = 0;
5980
5981 if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5982 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5983 if (list && len <= list_len)
5984 security_inode_listsecurity(dentry->d_inode, list, len);
5985 }
5986 return len;
5987}
5988
5989static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5990 .prefix = XATTR_SECURITY_PREFIX,
5991 .list = nfs4_xattr_list_nfs4_label,
5992 .get = nfs4_xattr_get_nfs4_label,
5993 .set = nfs4_xattr_set_nfs4_label,
5994};
5995#endif
5996
5997
5998/*
5999 * nfs_fhget will use either the mounted_on_fileid or the fileid
6000 */
6001static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6002{
6003 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6004 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6005 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6006 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6007 return;
6008
6009 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6010 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6011 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6012 fattr->nlink = 2;
6013}
6014
6015static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6016 const struct qstr *name,
6017 struct nfs4_fs_locations *fs_locations,
6018 struct page *page)
6019{
6020 struct nfs_server *server = NFS_SERVER(dir);
6021 u32 bitmask[3] = {
6022 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6023 };
6024 struct nfs4_fs_locations_arg args = {
6025 .dir_fh = NFS_FH(dir),
6026 .name = name,
6027 .page = page,
6028 .bitmask = bitmask,
6029 };
6030 struct nfs4_fs_locations_res res = {
6031 .fs_locations = fs_locations,
6032 };
6033 struct rpc_message msg = {
6034 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6035 .rpc_argp = &args,
6036 .rpc_resp = &res,
6037 };
6038 int status;
6039
6040 dprintk("%s: start\n", __func__);
6041
6042 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6043 * is not supported */
6044 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6045 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6046 else
6047 bitmask[0] |= FATTR4_WORD0_FILEID;
6048
6049 nfs_fattr_init(&fs_locations->fattr);
6050 fs_locations->server = server;
6051 fs_locations->nlocations = 0;
6052 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6053 dprintk("%s: returned status = %d\n", __func__, status);
6054 return status;
6055}
6056
6057int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6058 const struct qstr *name,
6059 struct nfs4_fs_locations *fs_locations,
6060 struct page *page)
6061{
6062 struct nfs4_exception exception = { };
6063 int err;
6064 do {
6065 err = _nfs4_proc_fs_locations(client, dir, name,
6066 fs_locations, page);
6067 trace_nfs4_get_fs_locations(dir, name, err);
6068 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6069 &exception);
6070 } while (exception.retry);
6071 return err;
6072}
6073
6074/*
6075 * This operation also signals the server that this client is
6076 * performing migration recovery. The server can stop returning
6077 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
6078 * appended to this compound to identify the client ID which is
6079 * performing recovery.
6080 */
6081static int _nfs40_proc_get_locations(struct inode *inode,
6082 struct nfs4_fs_locations *locations,
6083 struct page *page, struct rpc_cred *cred)
6084{
6085 struct nfs_server *server = NFS_SERVER(inode);
6086 struct rpc_clnt *clnt = server->client;
6087 u32 bitmask[2] = {
6088 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6089 };
6090 struct nfs4_fs_locations_arg args = {
6091 .clientid = server->nfs_client->cl_clientid,
6092 .fh = NFS_FH(inode),
6093 .page = page,
6094 .bitmask = bitmask,
6095 .migration = 1, /* skip LOOKUP */
6096 .renew = 1, /* append RENEW */
6097 };
6098 struct nfs4_fs_locations_res res = {
6099 .fs_locations = locations,
6100 .migration = 1,
6101 .renew = 1,
6102 };
6103 struct rpc_message msg = {
6104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6105 .rpc_argp = &args,
6106 .rpc_resp = &res,
6107 .rpc_cred = cred,
6108 };
6109 unsigned long now = jiffies;
6110 int status;
6111
6112 nfs_fattr_init(&locations->fattr);
6113 locations->server = server;
6114 locations->nlocations = 0;
6115
6116 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6117 nfs4_set_sequence_privileged(&args.seq_args);
6118 status = nfs4_call_sync_sequence(clnt, server, &msg,
6119 &args.seq_args, &res.seq_res);
6120 if (status)
6121 return status;
6122
6123 renew_lease(server, now);
6124 return 0;
6125}
6126
6127#ifdef CONFIG_NFS_V4_1
6128
6129/*
6130 * This operation also signals the server that this client is
6131 * performing migration recovery. The server can stop asserting
6132 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
6133 * performing this operation is identified in the SEQUENCE
6134 * operation in this compound.
6135 *
6136 * When the client supports GETATTR(fs_locations_info), it can
6137 * be plumbed in here.
6138 */
6139static int _nfs41_proc_get_locations(struct inode *inode,
6140 struct nfs4_fs_locations *locations,
6141 struct page *page, struct rpc_cred *cred)
6142{
6143 struct nfs_server *server = NFS_SERVER(inode);
6144 struct rpc_clnt *clnt = server->client;
6145 u32 bitmask[2] = {
6146 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6147 };
6148 struct nfs4_fs_locations_arg args = {
6149 .fh = NFS_FH(inode),
6150 .page = page,
6151 .bitmask = bitmask,
6152 .migration = 1, /* skip LOOKUP */
6153 };
6154 struct nfs4_fs_locations_res res = {
6155 .fs_locations = locations,
6156 .migration = 1,
6157 };
6158 struct rpc_message msg = {
6159 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6160 .rpc_argp = &args,
6161 .rpc_resp = &res,
6162 .rpc_cred = cred,
6163 };
6164 int status;
6165
6166 nfs_fattr_init(&locations->fattr);
6167 locations->server = server;
6168 locations->nlocations = 0;
6169
6170 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6171 nfs4_set_sequence_privileged(&args.seq_args);
6172 status = nfs4_call_sync_sequence(clnt, server, &msg,
6173 &args.seq_args, &res.seq_res);
6174 if (status == NFS4_OK &&
6175 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6176 status = -NFS4ERR_LEASE_MOVED;
6177 return status;
6178}
6179
6180#endif /* CONFIG_NFS_V4_1 */
6181
6182/**
6183 * nfs4_proc_get_locations - discover locations for a migrated FSID
6184 * @inode: inode on FSID that is migrating
6185 * @locations: result of query
6186 * @page: buffer
6187 * @cred: credential to use for this operation
6188 *
6189 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6190 * operation failed, or a negative errno if a local error occurred.
6191 *
6192 * On success, "locations" is filled in, but if the server has
6193 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6194 * asserted.
6195 *
6196 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6197 * from this client that require migration recovery.
6198 */
6199int nfs4_proc_get_locations(struct inode *inode,
6200 struct nfs4_fs_locations *locations,
6201 struct page *page, struct rpc_cred *cred)
6202{
6203 struct nfs_server *server = NFS_SERVER(inode);
6204 struct nfs_client *clp = server->nfs_client;
6205 const struct nfs4_mig_recovery_ops *ops =
6206 clp->cl_mvops->mig_recovery_ops;
6207 struct nfs4_exception exception = { };
6208 int status;
6209
6210 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6211 (unsigned long long)server->fsid.major,
6212 (unsigned long long)server->fsid.minor,
6213 clp->cl_hostname);
6214 nfs_display_fhandle(NFS_FH(inode), __func__);
6215
6216 do {
6217 status = ops->get_locations(inode, locations, page, cred);
6218 if (status != -NFS4ERR_DELAY)
6219 break;
6220 nfs4_handle_exception(server, status, &exception);
6221 } while (exception.retry);
6222 return status;
6223}
6224
6225/*
6226 * This operation also signals the server that this client is
6227 * performing "lease moved" recovery. The server can stop
6228 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
6229 * is appended to this compound to identify the client ID which is
6230 * performing recovery.
6231 */
6232static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6233{
6234 struct nfs_server *server = NFS_SERVER(inode);
6235 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6236 struct rpc_clnt *clnt = server->client;
6237 struct nfs4_fsid_present_arg args = {
6238 .fh = NFS_FH(inode),
6239 .clientid = clp->cl_clientid,
6240 .renew = 1, /* append RENEW */
6241 };
6242 struct nfs4_fsid_present_res res = {
6243 .renew = 1,
6244 };
6245 struct rpc_message msg = {
6246 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6247 .rpc_argp = &args,
6248 .rpc_resp = &res,
6249 .rpc_cred = cred,
6250 };
6251 unsigned long now = jiffies;
6252 int status;
6253
6254 res.fh = nfs_alloc_fhandle();
6255 if (res.fh == NULL)
6256 return -ENOMEM;
6257
6258 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6259 nfs4_set_sequence_privileged(&args.seq_args);
6260 status = nfs4_call_sync_sequence(clnt, server, &msg,
6261 &args.seq_args, &res.seq_res);
6262 nfs_free_fhandle(res.fh);
6263 if (status)
6264 return status;
6265
6266 do_renew_lease(clp, now);
6267 return 0;
6268}
6269
6270#ifdef CONFIG_NFS_V4_1
6271
6272/*
6273 * This operation also signals the server that this client is
6274 * performing "lease moved" recovery. The server can stop asserting
6275 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
6276 * this operation is identified in the SEQUENCE operation in this
6277 * compound.
6278 */
6279static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6280{
6281 struct nfs_server *server = NFS_SERVER(inode);
6282 struct rpc_clnt *clnt = server->client;
6283 struct nfs4_fsid_present_arg args = {
6284 .fh = NFS_FH(inode),
6285 };
6286 struct nfs4_fsid_present_res res = {
6287 };
6288 struct rpc_message msg = {
6289 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6290 .rpc_argp = &args,
6291 .rpc_resp = &res,
6292 .rpc_cred = cred,
6293 };
6294 int status;
6295
6296 res.fh = nfs_alloc_fhandle();
6297 if (res.fh == NULL)
6298 return -ENOMEM;
6299
6300 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6301 nfs4_set_sequence_privileged(&args.seq_args);
6302 status = nfs4_call_sync_sequence(clnt, server, &msg,
6303 &args.seq_args, &res.seq_res);
6304 nfs_free_fhandle(res.fh);
6305 if (status == NFS4_OK &&
6306 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6307 status = -NFS4ERR_LEASE_MOVED;
6308 return status;
6309}
6310
6311#endif /* CONFIG_NFS_V4_1 */
6312
6313/**
6314 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6315 * @inode: inode on FSID to check
6316 * @cred: credential to use for this operation
6317 *
6318 * Server indicates whether the FSID is present, moved, or not
6319 * recognized. This operation is necessary to clear a LEASE_MOVED
6320 * condition for this client ID.
6321 *
6322 * Returns NFS4_OK if the FSID is present on this server,
6323 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6324 * NFS4ERR code if some error occurred on the server, or a
6325 * negative errno if a local failure occurred.
6326 */
6327int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6328{
6329 struct nfs_server *server = NFS_SERVER(inode);
6330 struct nfs_client *clp = server->nfs_client;
6331 const struct nfs4_mig_recovery_ops *ops =
6332 clp->cl_mvops->mig_recovery_ops;
6333 struct nfs4_exception exception = { };
6334 int status;
6335
6336 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6337 (unsigned long long)server->fsid.major,
6338 (unsigned long long)server->fsid.minor,
6339 clp->cl_hostname);
6340 nfs_display_fhandle(NFS_FH(inode), __func__);
6341
6342 do {
6343 status = ops->fsid_present(inode, cred);
6344 if (status != -NFS4ERR_DELAY)
6345 break;
6346 nfs4_handle_exception(server, status, &exception);
6347 } while (exception.retry);
6348 return status;
6349}
6350
6351/**
6352 * If 'use_integrity' is true and the state managment nfs_client
6353 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6354 * and the machine credential as per RFC3530bis and RFC5661 Security
6355 * Considerations sections. Otherwise, just use the user cred with the
6356 * filesystem's rpc_client.
6357 */
6358static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6359{
6360 int status;
6361 struct nfs4_secinfo_arg args = {
6362 .dir_fh = NFS_FH(dir),
6363 .name = name,
6364 };
6365 struct nfs4_secinfo_res res = {
6366 .flavors = flavors,
6367 };
6368 struct rpc_message msg = {
6369 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6370 .rpc_argp = &args,
6371 .rpc_resp = &res,
6372 };
6373 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6374 struct rpc_cred *cred = NULL;
6375
6376 if (use_integrity) {
6377 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6378 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6379 msg.rpc_cred = cred;
6380 }
6381
6382 dprintk("NFS call secinfo %s\n", name->name);
6383
6384 nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6385 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6386
6387 status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6388 &res.seq_res, 0);
6389 dprintk("NFS reply secinfo: %d\n", status);
6390
6391 if (cred)
6392 put_rpccred(cred);
6393
6394 return status;
6395}
6396
6397int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6398 struct nfs4_secinfo_flavors *flavors)
6399{
6400 struct nfs4_exception exception = { };
6401 int err;
6402 do {
6403 err = -NFS4ERR_WRONGSEC;
6404
6405 /* try to use integrity protection with machine cred */
6406 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6407 err = _nfs4_proc_secinfo(dir, name, flavors, true);
6408
6409 /*
6410 * if unable to use integrity protection, or SECINFO with
6411 * integrity protection returns NFS4ERR_WRONGSEC (which is
6412 * disallowed by spec, but exists in deployed servers) use
6413 * the current filesystem's rpc_client and the user cred.
6414 */
6415 if (err == -NFS4ERR_WRONGSEC)
6416 err = _nfs4_proc_secinfo(dir, name, flavors, false);
6417
6418 trace_nfs4_secinfo(dir, name, err);
6419 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6420 &exception);
6421 } while (exception.retry);
6422 return err;
6423}
6424
6425#ifdef CONFIG_NFS_V4_1
6426/*
6427 * Check the exchange flags returned by the server for invalid flags, having
6428 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6429 * DS flags set.
6430 */
6431static int nfs4_check_cl_exchange_flags(u32 flags)
6432{
6433 if (flags & ~EXCHGID4_FLAG_MASK_R)
6434 goto out_inval;
6435 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6436 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6437 goto out_inval;
6438 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6439 goto out_inval;
6440 return NFS_OK;
6441out_inval:
6442 return -NFS4ERR_INVAL;
6443}
6444
6445static bool
6446nfs41_same_server_scope(struct nfs41_server_scope *a,
6447 struct nfs41_server_scope *b)
6448{
6449 if (a->server_scope_sz == b->server_scope_sz &&
6450 memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6451 return true;
6452
6453 return false;
6454}
6455
6456/*
6457 * nfs4_proc_bind_conn_to_session()
6458 *
6459 * The 4.1 client currently uses the same TCP connection for the
6460 * fore and backchannel.
6461 */
6462int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6463{
6464 int status;
6465 struct nfs41_bind_conn_to_session_res res;
6466 struct rpc_message msg = {
6467 .rpc_proc =
6468 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6469 .rpc_argp = clp,
6470 .rpc_resp = &res,
6471 .rpc_cred = cred,
6472 };
6473
6474 dprintk("--> %s\n", __func__);
6475
6476 res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6477 if (unlikely(res.session == NULL)) {
6478 status = -ENOMEM;
6479 goto out;
6480 }
6481
6482 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6483 trace_nfs4_bind_conn_to_session(clp, status);
6484 if (status == 0) {
6485 if (memcmp(res.session->sess_id.data,
6486 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6487 dprintk("NFS: %s: Session ID mismatch\n", __func__);
6488 status = -EIO;
6489 goto out_session;
6490 }
6491 if (res.dir != NFS4_CDFS4_BOTH) {
6492 dprintk("NFS: %s: Unexpected direction from server\n",
6493 __func__);
6494 status = -EIO;
6495 goto out_session;
6496 }
6497 if (res.use_conn_in_rdma_mode) {
6498 dprintk("NFS: %s: Server returned RDMA mode = true\n",
6499 __func__);
6500 status = -EIO;
6501 goto out_session;
6502 }
6503 }
6504out_session:
6505 kfree(res.session);
6506out:
6507 dprintk("<-- %s status= %d\n", __func__, status);
6508 return status;
6509}
6510
6511/*
6512 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6513 * and operations we'd like to see to enable certain features in the allow map
6514 */
6515static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6516 .how = SP4_MACH_CRED,
6517 .enforce.u.words = {
6518 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6519 1 << (OP_EXCHANGE_ID - 32) |
6520 1 << (OP_CREATE_SESSION - 32) |
6521 1 << (OP_DESTROY_SESSION - 32) |
6522 1 << (OP_DESTROY_CLIENTID - 32)
6523 },
6524 .allow.u.words = {
6525 [0] = 1 << (OP_CLOSE) |
6526 1 << (OP_LOCKU) |
6527 1 << (OP_COMMIT),
6528 [1] = 1 << (OP_SECINFO - 32) |
6529 1 << (OP_SECINFO_NO_NAME - 32) |
6530 1 << (OP_TEST_STATEID - 32) |
6531 1 << (OP_FREE_STATEID - 32) |
6532 1 << (OP_WRITE - 32)
6533 }
6534};
6535
6536/*
6537 * Select the state protection mode for client `clp' given the server results
6538 * from exchange_id in `sp'.
6539 *
6540 * Returns 0 on success, negative errno otherwise.
6541 */
6542static int nfs4_sp4_select_mode(struct nfs_client *clp,
6543 struct nfs41_state_protection *sp)
6544{
6545 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6546 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6547 1 << (OP_EXCHANGE_ID - 32) |
6548 1 << (OP_CREATE_SESSION - 32) |
6549 1 << (OP_DESTROY_SESSION - 32) |
6550 1 << (OP_DESTROY_CLIENTID - 32)
6551 };
6552 unsigned int i;
6553
6554 if (sp->how == SP4_MACH_CRED) {
6555 /* Print state protect result */
6556 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6557 for (i = 0; i <= LAST_NFS4_OP; i++) {
6558 if (test_bit(i, sp->enforce.u.longs))
6559 dfprintk(MOUNT, " enforce op %d\n", i);
6560 if (test_bit(i, sp->allow.u.longs))
6561 dfprintk(MOUNT, " allow op %d\n", i);
6562 }
6563
6564 /* make sure nothing is on enforce list that isn't supported */
6565 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6566 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6567 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6568 return -EINVAL;
6569 }
6570 }
6571
6572 /*
6573 * Minimal mode - state operations are allowed to use machine
6574 * credential. Note this already happens by default, so the
6575 * client doesn't have to do anything more than the negotiation.
6576 *
6577 * NOTE: we don't care if EXCHANGE_ID is in the list -
6578 * we're already using the machine cred for exchange_id
6579 * and will never use a different cred.
6580 */
6581 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6582 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6583 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6584 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6585 dfprintk(MOUNT, "sp4_mach_cred:\n");
6586 dfprintk(MOUNT, " minimal mode enabled\n");
6587 set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6588 } else {
6589 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6590 return -EINVAL;
6591 }
6592
6593 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6594 test_bit(OP_LOCKU, sp->allow.u.longs)) {
6595 dfprintk(MOUNT, " cleanup mode enabled\n");
6596 set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6597 }
6598
6599 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6600 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6601 dfprintk(MOUNT, " secinfo mode enabled\n");
6602 set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6603 }
6604
6605 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6606 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6607 dfprintk(MOUNT, " stateid mode enabled\n");
6608 set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6609 }
6610
6611 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6612 dfprintk(MOUNT, " write mode enabled\n");
6613 set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6614 }
6615
6616 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6617 dfprintk(MOUNT, " commit mode enabled\n");
6618 set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6619 }
6620 }
6621
6622 return 0;
6623}
6624
6625/*
6626 * _nfs4_proc_exchange_id()
6627 *
6628 * Wrapper for EXCHANGE_ID operation.
6629 */
6630static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6631 u32 sp4_how)
6632{
6633 nfs4_verifier verifier;
6634 struct nfs41_exchange_id_args args = {
6635 .verifier = &verifier,
6636 .client = clp,
6637#ifdef CONFIG_NFS_V4_1_MIGRATION
6638 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6639 EXCHGID4_FLAG_BIND_PRINC_STATEID |
6640 EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6641#else
6642 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6643 EXCHGID4_FLAG_BIND_PRINC_STATEID,
6644#endif
6645 };
6646 struct nfs41_exchange_id_res res = {
6647 0
6648 };
6649 int status;
6650 struct rpc_message msg = {
6651 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6652 .rpc_argp = &args,
6653 .rpc_resp = &res,
6654 .rpc_cred = cred,
6655 };
6656
6657 nfs4_init_boot_verifier(clp, &verifier);
6658 args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6659 sizeof(args.id));
6660 dprintk("NFS call exchange_id auth=%s, '%.*s'\n",
6661 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6662 args.id_len, args.id);
6663
6664 res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6665 GFP_NOFS);
6666 if (unlikely(res.server_owner == NULL)) {
6667 status = -ENOMEM;
6668 goto out;
6669 }
6670
6671 res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6672 GFP_NOFS);
6673 if (unlikely(res.server_scope == NULL)) {
6674 status = -ENOMEM;
6675 goto out_server_owner;
6676 }
6677
6678 res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6679 if (unlikely(res.impl_id == NULL)) {
6680 status = -ENOMEM;
6681 goto out_server_scope;
6682 }
6683
6684 switch (sp4_how) {
6685 case SP4_NONE:
6686 args.state_protect.how = SP4_NONE;
6687 break;
6688
6689 case SP4_MACH_CRED:
6690 args.state_protect = nfs4_sp4_mach_cred_request;
6691 break;
6692
6693 default:
6694 /* unsupported! */
6695 WARN_ON_ONCE(1);
6696 status = -EINVAL;
6697 goto out_server_scope;
6698 }
6699
6700 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6701 trace_nfs4_exchange_id(clp, status);
6702 if (status == 0)
6703 status = nfs4_check_cl_exchange_flags(res.flags);
6704
6705 if (status == 0)
6706 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6707
6708 if (status == 0) {
6709 clp->cl_clientid = res.clientid;
6710 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6711 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6712 clp->cl_seqid = res.seqid;
6713
6714 kfree(clp->cl_serverowner);
6715 clp->cl_serverowner = res.server_owner;
6716 res.server_owner = NULL;
6717
6718 /* use the most recent implementation id */
6719 kfree(clp->cl_implid);
6720 clp->cl_implid = res.impl_id;
6721
6722 if (clp->cl_serverscope != NULL &&
6723 !nfs41_same_server_scope(clp->cl_serverscope,
6724 res.server_scope)) {
6725 dprintk("%s: server_scope mismatch detected\n",
6726 __func__);
6727 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6728 kfree(clp->cl_serverscope);
6729 clp->cl_serverscope = NULL;
6730 }
6731
6732 if (clp->cl_serverscope == NULL) {
6733 clp->cl_serverscope = res.server_scope;
6734 goto out;
6735 }
6736 } else
6737 kfree(res.impl_id);
6738
6739out_server_owner:
6740 kfree(res.server_owner);
6741out_server_scope:
6742 kfree(res.server_scope);
6743out:
6744 if (clp->cl_implid != NULL)
6745 dprintk("NFS reply exchange_id: Server Implementation ID: "
6746 "domain: %s, name: %s, date: %llu,%u\n",
6747 clp->cl_implid->domain, clp->cl_implid->name,
6748 clp->cl_implid->date.seconds,
6749 clp->cl_implid->date.nseconds);
6750 dprintk("NFS reply exchange_id: %d\n", status);
6751 return status;
6752}
6753
6754/*
6755 * nfs4_proc_exchange_id()
6756 *
6757 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6758 *
6759 * Since the clientid has expired, all compounds using sessions
6760 * associated with the stale clientid will be returning
6761 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6762 * be in some phase of session reset.
6763 *
6764 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6765 */
6766int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6767{
6768 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6769 int status;
6770
6771 /* try SP4_MACH_CRED if krb5i/p */
6772 if (authflavor == RPC_AUTH_GSS_KRB5I ||
6773 authflavor == RPC_AUTH_GSS_KRB5P) {
6774 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6775 if (!status)
6776 return 0;
6777 }
6778
6779 /* try SP4_NONE */
6780 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6781}
6782
6783static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6784 struct rpc_cred *cred)
6785{
6786 struct rpc_message msg = {
6787 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6788 .rpc_argp = clp,
6789 .rpc_cred = cred,
6790 };
6791 int status;
6792
6793 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6794 trace_nfs4_destroy_clientid(clp, status);
6795 if (status)
6796 dprintk("NFS: Got error %d from the server %s on "
6797 "DESTROY_CLIENTID.", status, clp->cl_hostname);
6798 return status;
6799}
6800
6801static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6802 struct rpc_cred *cred)
6803{
6804 unsigned int loop;
6805 int ret;
6806
6807 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6808 ret = _nfs4_proc_destroy_clientid(clp, cred);
6809 switch (ret) {
6810 case -NFS4ERR_DELAY:
6811 case -NFS4ERR_CLIENTID_BUSY:
6812 ssleep(1);
6813 break;
6814 default:
6815 return ret;
6816 }
6817 }
6818 return 0;
6819}
6820
6821int nfs4_destroy_clientid(struct nfs_client *clp)
6822{
6823 struct rpc_cred *cred;
6824 int ret = 0;
6825
6826 if (clp->cl_mvops->minor_version < 1)
6827 goto out;
6828 if (clp->cl_exchange_flags == 0)
6829 goto out;
6830 if (clp->cl_preserve_clid)
6831 goto out;
6832 cred = nfs4_get_clid_cred(clp);
6833 ret = nfs4_proc_destroy_clientid(clp, cred);
6834 if (cred)
6835 put_rpccred(cred);
6836 switch (ret) {
6837 case 0:
6838 case -NFS4ERR_STALE_CLIENTID:
6839 clp->cl_exchange_flags = 0;
6840 }
6841out:
6842 return ret;
6843}
6844
6845struct nfs4_get_lease_time_data {
6846 struct nfs4_get_lease_time_args *args;
6847 struct nfs4_get_lease_time_res *res;
6848 struct nfs_client *clp;
6849};
6850
6851static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6852 void *calldata)
6853{
6854 struct nfs4_get_lease_time_data *data =
6855 (struct nfs4_get_lease_time_data *)calldata;
6856
6857 dprintk("--> %s\n", __func__);
6858 /* just setup sequence, do not trigger session recovery
6859 since we're invoked within one */
6860 nfs41_setup_sequence(data->clp->cl_session,
6861 &data->args->la_seq_args,
6862 &data->res->lr_seq_res,
6863 task);
6864 dprintk("<-- %s\n", __func__);
6865}
6866
6867/*
6868 * Called from nfs4_state_manager thread for session setup, so don't recover
6869 * from sequence operation or clientid errors.
6870 */
6871static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6872{
6873 struct nfs4_get_lease_time_data *data =
6874 (struct nfs4_get_lease_time_data *)calldata;
6875
6876 dprintk("--> %s\n", __func__);
6877 if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6878 return;
6879 switch (task->tk_status) {
6880 case -NFS4ERR_DELAY:
6881 case -NFS4ERR_GRACE:
6882 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6883 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6884 task->tk_status = 0;
6885 /* fall through */
6886 case -NFS4ERR_RETRY_UNCACHED_REP:
6887 rpc_restart_call_prepare(task);
6888 return;
6889 }
6890 dprintk("<-- %s\n", __func__);
6891}
6892
6893static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6894 .rpc_call_prepare = nfs4_get_lease_time_prepare,
6895 .rpc_call_done = nfs4_get_lease_time_done,
6896};
6897
6898int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6899{
6900 struct rpc_task *task;
6901 struct nfs4_get_lease_time_args args;
6902 struct nfs4_get_lease_time_res res = {
6903 .lr_fsinfo = fsinfo,
6904 };
6905 struct nfs4_get_lease_time_data data = {
6906 .args = &args,
6907 .res = &res,
6908 .clp = clp,
6909 };
6910 struct rpc_message msg = {
6911 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6912 .rpc_argp = &args,
6913 .rpc_resp = &res,
6914 };
6915 struct rpc_task_setup task_setup = {
6916 .rpc_client = clp->cl_rpcclient,
6917 .rpc_message = &msg,
6918 .callback_ops = &nfs4_get_lease_time_ops,
6919 .callback_data = &data,
6920 .flags = RPC_TASK_TIMEOUT,
6921 };
6922 int status;
6923
6924 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6925 nfs4_set_sequence_privileged(&args.la_seq_args);
6926 dprintk("--> %s\n", __func__);
6927 task = rpc_run_task(&task_setup);
6928
6929 if (IS_ERR(task))
6930 status = PTR_ERR(task);
6931 else {
6932 status = task->tk_status;
6933 rpc_put_task(task);
6934 }
6935 dprintk("<-- %s return %d\n", __func__, status);
6936
6937 return status;
6938}
6939
6940/*
6941 * Initialize the values to be used by the client in CREATE_SESSION
6942 * If nfs4_init_session set the fore channel request and response sizes,
6943 * use them.
6944 *
6945 * Set the back channel max_resp_sz_cached to zero to force the client to
6946 * always set csa_cachethis to FALSE because the current implementation
6947 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6948 */
6949static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6950{
6951 unsigned int max_rqst_sz, max_resp_sz;
6952
6953 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6954 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6955
6956 /* Fore channel attributes */
6957 args->fc_attrs.max_rqst_sz = max_rqst_sz;
6958 args->fc_attrs.max_resp_sz = max_resp_sz;
6959 args->fc_attrs.max_ops = NFS4_MAX_OPS;
6960 args->fc_attrs.max_reqs = max_session_slots;
6961
6962 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6963 "max_ops=%u max_reqs=%u\n",
6964 __func__,
6965 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6966 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6967
6968 /* Back channel attributes */
6969 args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6970 args->bc_attrs.max_resp_sz = PAGE_SIZE;
6971 args->bc_attrs.max_resp_sz_cached = 0;
6972 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6973 args->bc_attrs.max_reqs = 1;
6974
6975 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6976 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6977 __func__,
6978 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6979 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6980 args->bc_attrs.max_reqs);
6981}
6982
6983static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6984{
6985 struct nfs4_channel_attrs *sent = &args->fc_attrs;
6986 struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6987
6988 if (rcvd->max_resp_sz > sent->max_resp_sz)
6989 return -EINVAL;
6990 /*
6991 * Our requested max_ops is the minimum we need; we're not
6992 * prepared to break up compounds into smaller pieces than that.
6993 * So, no point even trying to continue if the server won't
6994 * cooperate:
6995 */
6996 if (rcvd->max_ops < sent->max_ops)
6997 return -EINVAL;
6998 if (rcvd->max_reqs == 0)
6999 return -EINVAL;
7000 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7001 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7002 return 0;
7003}
7004
7005static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7006{
7007 struct nfs4_channel_attrs *sent = &args->bc_attrs;
7008 struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7009
7010 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7011 return -EINVAL;
7012 if (rcvd->max_resp_sz < sent->max_resp_sz)
7013 return -EINVAL;
7014 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7015 return -EINVAL;
7016 /* These would render the backchannel useless: */
7017 if (rcvd->max_ops != sent->max_ops)
7018 return -EINVAL;
7019 if (rcvd->max_reqs != sent->max_reqs)
7020 return -EINVAL;
7021 return 0;
7022}
7023
7024static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7025 struct nfs4_session *session)
7026{
7027 int ret;
7028
7029 ret = nfs4_verify_fore_channel_attrs(args, session);
7030 if (ret)
7031 return ret;
7032 return nfs4_verify_back_channel_attrs(args, session);
7033}
7034
7035static int _nfs4_proc_create_session(struct nfs_client *clp,
7036 struct rpc_cred *cred)
7037{
7038 struct nfs4_session *session = clp->cl_session;
7039 struct nfs41_create_session_args args = {
7040 .client = clp,
7041 .cb_program = NFS4_CALLBACK,
7042 };
7043 struct nfs41_create_session_res res = {
7044 .client = clp,
7045 };
7046 struct rpc_message msg = {
7047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7048 .rpc_argp = &args,
7049 .rpc_resp = &res,
7050 .rpc_cred = cred,
7051 };
7052 int status;
7053
7054 nfs4_init_channel_attrs(&args);
7055 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7056
7057 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7058 trace_nfs4_create_session(clp, status);
7059
7060 if (!status) {
7061 /* Verify the session's negotiated channel_attrs values */
7062 status = nfs4_verify_channel_attrs(&args, session);
7063 /* Increment the clientid slot sequence id */
7064 clp->cl_seqid++;
7065 }
7066
7067 return status;
7068}
7069
7070/*
7071 * Issues a CREATE_SESSION operation to the server.
7072 * It is the responsibility of the caller to verify the session is
7073 * expired before calling this routine.
7074 */
7075int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7076{
7077 int status;
7078 unsigned *ptr;
7079 struct nfs4_session *session = clp->cl_session;
7080
7081 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7082
7083 status = _nfs4_proc_create_session(clp, cred);
7084 if (status)
7085 goto out;
7086
7087 /* Init or reset the session slot tables */
7088 status = nfs4_setup_session_slot_tables(session);
7089 dprintk("slot table setup returned %d\n", status);
7090 if (status)
7091 goto out;
7092
7093 ptr = (unsigned *)&session->sess_id.data[0];
7094 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7095 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7096out:
7097 dprintk("<-- %s\n", __func__);
7098 return status;
7099}
7100
7101/*
7102 * Issue the over-the-wire RPC DESTROY_SESSION.
7103 * The caller must serialize access to this routine.
7104 */
7105int nfs4_proc_destroy_session(struct nfs4_session *session,
7106 struct rpc_cred *cred)
7107{
7108 struct rpc_message msg = {
7109 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7110 .rpc_argp = session,
7111 .rpc_cred = cred,
7112 };
7113 int status = 0;
7114
7115 dprintk("--> nfs4_proc_destroy_session\n");
7116
7117 /* session is still being setup */
7118 if (session->clp->cl_cons_state != NFS_CS_READY)
7119 return status;
7120
7121 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7122 trace_nfs4_destroy_session(session->clp, status);
7123
7124 if (status)
7125 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7126 "Session has been destroyed regardless...\n", status);
7127
7128 dprintk("<-- nfs4_proc_destroy_session\n");
7129 return status;
7130}
7131
7132/*
7133 * Renew the cl_session lease.
7134 */
7135struct nfs4_sequence_data {
7136 struct nfs_client *clp;
7137 struct nfs4_sequence_args args;
7138 struct nfs4_sequence_res res;
7139};
7140
7141static void nfs41_sequence_release(void *data)
7142{
7143 struct nfs4_sequence_data *calldata = data;
7144 struct nfs_client *clp = calldata->clp;
7145
7146 if (atomic_read(&clp->cl_count) > 1)
7147 nfs4_schedule_state_renewal(clp);
7148 nfs_put_client(clp);
7149 kfree(calldata);
7150}
7151
7152static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7153{
7154 switch(task->tk_status) {
7155 case -NFS4ERR_DELAY:
7156 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7157 return -EAGAIN;
7158 default:
7159 nfs4_schedule_lease_recovery(clp);
7160 }
7161 return 0;
7162}
7163
7164static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7165{
7166 struct nfs4_sequence_data *calldata = data;
7167 struct nfs_client *clp = calldata->clp;
7168
7169 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7170 return;
7171
7172 trace_nfs4_sequence(clp, task->tk_status);
7173 if (task->tk_status < 0) {
7174 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7175 if (atomic_read(&clp->cl_count) == 1)
7176 goto out;
7177
7178 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7179 rpc_restart_call_prepare(task);
7180 return;
7181 }
7182 }
7183 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7184out:
7185 dprintk("<-- %s\n", __func__);
7186}
7187
7188static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7189{
7190 struct nfs4_sequence_data *calldata = data;
7191 struct nfs_client *clp = calldata->clp;
7192 struct nfs4_sequence_args *args;
7193 struct nfs4_sequence_res *res;
7194
7195 args = task->tk_msg.rpc_argp;
7196 res = task->tk_msg.rpc_resp;
7197
7198 nfs41_setup_sequence(clp->cl_session, args, res, task);
7199}
7200
7201static const struct rpc_call_ops nfs41_sequence_ops = {
7202 .rpc_call_done = nfs41_sequence_call_done,
7203 .rpc_call_prepare = nfs41_sequence_prepare,
7204 .rpc_release = nfs41_sequence_release,
7205};
7206
7207static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7208 struct rpc_cred *cred,
7209 bool is_privileged)
7210{
7211 struct nfs4_sequence_data *calldata;
7212 struct rpc_message msg = {
7213 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7214 .rpc_cred = cred,
7215 };
7216 struct rpc_task_setup task_setup_data = {
7217 .rpc_client = clp->cl_rpcclient,
7218 .rpc_message = &msg,
7219 .callback_ops = &nfs41_sequence_ops,
7220 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7221 };
7222
7223 if (!atomic_inc_not_zero(&clp->cl_count))
7224 return ERR_PTR(-EIO);
7225 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7226 if (calldata == NULL) {
7227 nfs_put_client(clp);
7228 return ERR_PTR(-ENOMEM);
7229 }
7230 nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7231 if (is_privileged)
7232 nfs4_set_sequence_privileged(&calldata->args);
7233 msg.rpc_argp = &calldata->args;
7234 msg.rpc_resp = &calldata->res;
7235 calldata->clp = clp;
7236 task_setup_data.callback_data = calldata;
7237
7238 return rpc_run_task(&task_setup_data);
7239}
7240
7241static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7242{
7243 struct rpc_task *task;
7244 int ret = 0;
7245
7246 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7247 return 0;
7248 task = _nfs41_proc_sequence(clp, cred, false);
7249 if (IS_ERR(task))
7250 ret = PTR_ERR(task);
7251 else
7252 rpc_put_task_async(task);
7253 dprintk("<-- %s status=%d\n", __func__, ret);
7254 return ret;
7255}
7256
7257static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7258{
7259 struct rpc_task *task;
7260 int ret;
7261
7262 task = _nfs41_proc_sequence(clp, cred, true);
7263 if (IS_ERR(task)) {
7264 ret = PTR_ERR(task);
7265 goto out;
7266 }
7267 ret = rpc_wait_for_completion_task(task);
7268 if (!ret) {
7269 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7270
7271 if (task->tk_status == 0)
7272 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7273 ret = task->tk_status;
7274 }
7275 rpc_put_task(task);
7276out:
7277 dprintk("<-- %s status=%d\n", __func__, ret);
7278 return ret;
7279}
7280
7281struct nfs4_reclaim_complete_data {
7282 struct nfs_client *clp;
7283 struct nfs41_reclaim_complete_args arg;
7284 struct nfs41_reclaim_complete_res res;
7285};
7286
7287static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7288{
7289 struct nfs4_reclaim_complete_data *calldata = data;
7290
7291 nfs41_setup_sequence(calldata->clp->cl_session,
7292 &calldata->arg.seq_args,
7293 &calldata->res.seq_res,
7294 task);
7295}
7296
7297static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7298{
7299 switch(task->tk_status) {
7300 case 0:
7301 case -NFS4ERR_COMPLETE_ALREADY:
7302 case -NFS4ERR_WRONG_CRED: /* What to do here? */
7303 break;
7304 case -NFS4ERR_DELAY:
7305 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7306 /* fall through */
7307 case -NFS4ERR_RETRY_UNCACHED_REP:
7308 return -EAGAIN;
7309 default:
7310 nfs4_schedule_lease_recovery(clp);
7311 }
7312 return 0;
7313}
7314
7315static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7316{
7317 struct nfs4_reclaim_complete_data *calldata = data;
7318 struct nfs_client *clp = calldata->clp;
7319 struct nfs4_sequence_res *res = &calldata->res.seq_res;
7320
7321 dprintk("--> %s\n", __func__);
7322 if (!nfs41_sequence_done(task, res))
7323 return;
7324
7325 trace_nfs4_reclaim_complete(clp, task->tk_status);
7326 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7327 rpc_restart_call_prepare(task);
7328 return;
7329 }
7330 dprintk("<-- %s\n", __func__);
7331}
7332
7333static void nfs4_free_reclaim_complete_data(void *data)
7334{
7335 struct nfs4_reclaim_complete_data *calldata = data;
7336
7337 kfree(calldata);
7338}
7339
7340static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7341 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7342 .rpc_call_done = nfs4_reclaim_complete_done,
7343 .rpc_release = nfs4_free_reclaim_complete_data,
7344};
7345
7346/*
7347 * Issue a global reclaim complete.
7348 */
7349static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7350 struct rpc_cred *cred)
7351{
7352 struct nfs4_reclaim_complete_data *calldata;
7353 struct rpc_task *task;
7354 struct rpc_message msg = {
7355 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7356 .rpc_cred = cred,
7357 };
7358 struct rpc_task_setup task_setup_data = {
7359 .rpc_client = clp->cl_rpcclient,
7360 .rpc_message = &msg,
7361 .callback_ops = &nfs4_reclaim_complete_call_ops,
7362 .flags = RPC_TASK_ASYNC,
7363 };
7364 int status = -ENOMEM;
7365
7366 dprintk("--> %s\n", __func__);
7367 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7368 if (calldata == NULL)
7369 goto out;
7370 calldata->clp = clp;
7371 calldata->arg.one_fs = 0;
7372
7373 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7374 nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7375 msg.rpc_argp = &calldata->arg;
7376 msg.rpc_resp = &calldata->res;
7377 task_setup_data.callback_data = calldata;
7378 task = rpc_run_task(&task_setup_data);
7379 if (IS_ERR(task)) {
7380 status = PTR_ERR(task);
7381 goto out;
7382 }
7383 status = nfs4_wait_for_completion_rpc_task(task);
7384 if (status == 0)
7385 status = task->tk_status;
7386 rpc_put_task(task);
7387 return 0;
7388out:
7389 dprintk("<-- %s status=%d\n", __func__, status);
7390 return status;
7391}
7392
7393static void
7394nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7395{
7396 struct nfs4_layoutget *lgp = calldata;
7397 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7398 struct nfs4_session *session = nfs4_get_session(server);
7399
7400 dprintk("--> %s\n", __func__);
7401 /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7402 * right now covering the LAYOUTGET we are about to send.
7403 * However, that is not so catastrophic, and there seems
7404 * to be no way to prevent it completely.
7405 */
7406 if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7407 &lgp->res.seq_res, task))
7408 return;
7409 if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7410 NFS_I(lgp->args.inode)->layout,
7411 lgp->args.ctx->state)) {
7412 rpc_exit(task, NFS4_OK);
7413 }
7414}
7415
7416static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7417{
7418 struct nfs4_layoutget *lgp = calldata;
7419 struct inode *inode = lgp->args.inode;
7420 struct nfs_server *server = NFS_SERVER(inode);
7421 struct pnfs_layout_hdr *lo;
7422 struct nfs4_state *state = NULL;
7423 unsigned long timeo, now, giveup;
7424
7425 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7426
7427 if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7428 goto out;
7429
7430 switch (task->tk_status) {
7431 case 0:
7432 goto out;
7433 /*
7434 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7435 * (or clients) writing to the same RAID stripe
7436 */
7437 case -NFS4ERR_LAYOUTTRYLATER:
7438 /*
7439 * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7440 * existing layout before getting a new one).
7441 */
7442 case -NFS4ERR_RECALLCONFLICT:
7443 timeo = rpc_get_timeout(task->tk_client);
7444 giveup = lgp->args.timestamp + timeo;
7445 now = jiffies;
7446 if (time_after(giveup, now)) {
7447 unsigned long delay;
7448
7449 /* Delay for:
7450 * - Not less then NFS4_POLL_RETRY_MIN.
7451 * - One last time a jiffie before we give up
7452 * - exponential backoff (time_now minus start_attempt)
7453 */
7454 delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7455 min((giveup - now - 1),
7456 now - lgp->args.timestamp));
7457
7458 dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7459 __func__, delay);
7460 rpc_delay(task, delay);
7461 task->tk_status = 0;
7462 rpc_restart_call_prepare(task);
7463 goto out; /* Do not call nfs4_async_handle_error() */
7464 }
7465 break;
7466 case -NFS4ERR_EXPIRED:
7467 case -NFS4ERR_BAD_STATEID:
7468 spin_lock(&inode->i_lock);
7469 lo = NFS_I(inode)->layout;
7470 if (!lo || list_empty(&lo->plh_segs)) {
7471 spin_unlock(&inode->i_lock);
7472 /* If the open stateid was bad, then recover it. */
7473 state = lgp->args.ctx->state;
7474 } else {
7475 LIST_HEAD(head);
7476
7477 pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7478 spin_unlock(&inode->i_lock);
7479 /* Mark the bad layout state as invalid, then
7480 * retry using the open stateid. */
7481 pnfs_free_lseg_list(&head);
7482 }
7483 }
7484 if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7485 rpc_restart_call_prepare(task);
7486out:
7487 dprintk("<-- %s\n", __func__);
7488}
7489
7490static size_t max_response_pages(struct nfs_server *server)
7491{
7492 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7493 return nfs_page_array_len(0, max_resp_sz);
7494}
7495
7496static void nfs4_free_pages(struct page **pages, size_t size)
7497{
7498 int i;
7499
7500 if (!pages)
7501 return;
7502
7503 for (i = 0; i < size; i++) {
7504 if (!pages[i])
7505 break;
7506 __free_page(pages[i]);
7507 }
7508 kfree(pages);
7509}
7510
7511static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7512{
7513 struct page **pages;
7514 int i;
7515
7516 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7517 if (!pages) {
7518 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7519 return NULL;
7520 }
7521
7522 for (i = 0; i < size; i++) {
7523 pages[i] = alloc_page(gfp_flags);
7524 if (!pages[i]) {
7525 dprintk("%s: failed to allocate page\n", __func__);
7526 nfs4_free_pages(pages, size);
7527 return NULL;
7528 }
7529 }
7530
7531 return pages;
7532}
7533
7534static void nfs4_layoutget_release(void *calldata)
7535{
7536 struct nfs4_layoutget *lgp = calldata;
7537 struct inode *inode = lgp->args.inode;
7538 struct nfs_server *server = NFS_SERVER(inode);
7539 size_t max_pages = max_response_pages(server);
7540
7541 dprintk("--> %s\n", __func__);
7542 nfs4_free_pages(lgp->args.layout.pages, max_pages);
7543 pnfs_put_layout_hdr(NFS_I(inode)->layout);
7544 put_nfs_open_context(lgp->args.ctx);
7545 kfree(calldata);
7546 dprintk("<-- %s\n", __func__);
7547}
7548
7549static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7550 .rpc_call_prepare = nfs4_layoutget_prepare,
7551 .rpc_call_done = nfs4_layoutget_done,
7552 .rpc_release = nfs4_layoutget_release,
7553};
7554
7555struct pnfs_layout_segment *
7556nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7557{
7558 struct inode *inode = lgp->args.inode;
7559 struct nfs_server *server = NFS_SERVER(inode);
7560 size_t max_pages = max_response_pages(server);
7561 struct rpc_task *task;
7562 struct rpc_message msg = {
7563 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7564 .rpc_argp = &lgp->args,
7565 .rpc_resp = &lgp->res,
7566 .rpc_cred = lgp->cred,
7567 };
7568 struct rpc_task_setup task_setup_data = {
7569 .rpc_client = server->client,
7570 .rpc_message = &msg,
7571 .callback_ops = &nfs4_layoutget_call_ops,
7572 .callback_data = lgp,
7573 .flags = RPC_TASK_ASYNC,
7574 };
7575 struct pnfs_layout_segment *lseg = NULL;
7576 int status = 0;
7577
7578 dprintk("--> %s\n", __func__);
7579
7580 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7581 if (!lgp->args.layout.pages) {
7582 nfs4_layoutget_release(lgp);
7583 return ERR_PTR(-ENOMEM);
7584 }
7585 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7586 lgp->args.timestamp = jiffies;
7587
7588 lgp->res.layoutp = &lgp->args.layout;
7589 lgp->res.seq_res.sr_slot = NULL;
7590 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7591
7592 /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7593 pnfs_get_layout_hdr(NFS_I(inode)->layout);
7594
7595 task = rpc_run_task(&task_setup_data);
7596 if (IS_ERR(task))
7597 return ERR_CAST(task);
7598 status = nfs4_wait_for_completion_rpc_task(task);
7599 if (status == 0)
7600 status = task->tk_status;
7601 trace_nfs4_layoutget(lgp->args.ctx,
7602 &lgp->args.range,
7603 &lgp->res.range,
7604 status);
7605 /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7606 if (status == 0 && lgp->res.layoutp->len)
7607 lseg = pnfs_layout_process(lgp);
7608 rpc_put_task(task);
7609 dprintk("<-- %s status=%d\n", __func__, status);
7610 if (status)
7611 return ERR_PTR(status);
7612 return lseg;
7613}
7614
7615static void
7616nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7617{
7618 struct nfs4_layoutreturn *lrp = calldata;
7619
7620 dprintk("--> %s\n", __func__);
7621 nfs41_setup_sequence(lrp->clp->cl_session,
7622 &lrp->args.seq_args,
7623 &lrp->res.seq_res,
7624 task);
7625}
7626
7627static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7628{
7629 struct nfs4_layoutreturn *lrp = calldata;
7630 struct nfs_server *server;
7631
7632 dprintk("--> %s\n", __func__);
7633
7634 if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7635 return;
7636
7637 server = NFS_SERVER(lrp->args.inode);
7638 switch (task->tk_status) {
7639 default:
7640 task->tk_status = 0;
7641 case 0:
7642 break;
7643 case -NFS4ERR_DELAY:
7644 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
7645 break;
7646 rpc_restart_call_prepare(task);
7647 return;
7648 }
7649 dprintk("<-- %s\n", __func__);
7650}
7651
7652static void nfs4_layoutreturn_release(void *calldata)
7653{
7654 struct nfs4_layoutreturn *lrp = calldata;
7655 struct pnfs_layout_hdr *lo = lrp->args.layout;
7656
7657 dprintk("--> %s\n", __func__);
7658 spin_lock(&lo->plh_inode->i_lock);
7659 if (lrp->res.lrs_present)
7660 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7661 lo->plh_block_lgets--;
7662 spin_unlock(&lo->plh_inode->i_lock);
7663 pnfs_put_layout_hdr(lrp->args.layout);
7664 kfree(calldata);
7665 dprintk("<-- %s\n", __func__);
7666}
7667
7668static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7669 .rpc_call_prepare = nfs4_layoutreturn_prepare,
7670 .rpc_call_done = nfs4_layoutreturn_done,
7671 .rpc_release = nfs4_layoutreturn_release,
7672};
7673
7674int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7675{
7676 struct rpc_task *task;
7677 struct rpc_message msg = {
7678 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7679 .rpc_argp = &lrp->args,
7680 .rpc_resp = &lrp->res,
7681 .rpc_cred = lrp->cred,
7682 };
7683 struct rpc_task_setup task_setup_data = {
7684 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7685 .rpc_message = &msg,
7686 .callback_ops = &nfs4_layoutreturn_call_ops,
7687 .callback_data = lrp,
7688 };
7689 int status;
7690
7691 dprintk("--> %s\n", __func__);
7692 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7693 task = rpc_run_task(&task_setup_data);
7694 if (IS_ERR(task))
7695 return PTR_ERR(task);
7696 status = task->tk_status;
7697 trace_nfs4_layoutreturn(lrp->args.inode, status);
7698 dprintk("<-- %s status=%d\n", __func__, status);
7699 rpc_put_task(task);
7700 return status;
7701}
7702
7703/*
7704 * Retrieve the list of Data Server devices from the MDS.
7705 */
7706static int _nfs4_getdevicelist(struct nfs_server *server,
7707 const struct nfs_fh *fh,
7708 struct pnfs_devicelist *devlist)
7709{
7710 struct nfs4_getdevicelist_args args = {
7711 .fh = fh,
7712 .layoutclass = server->pnfs_curr_ld->id,
7713 };
7714 struct nfs4_getdevicelist_res res = {
7715 .devlist = devlist,
7716 };
7717 struct rpc_message msg = {
7718 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7719 .rpc_argp = &args,
7720 .rpc_resp = &res,
7721 };
7722 int status;
7723
7724 dprintk("--> %s\n", __func__);
7725 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7726 &res.seq_res, 0);
7727 dprintk("<-- %s status=%d\n", __func__, status);
7728 return status;
7729}
7730
7731int nfs4_proc_getdevicelist(struct nfs_server *server,
7732 const struct nfs_fh *fh,
7733 struct pnfs_devicelist *devlist)
7734{
7735 struct nfs4_exception exception = { };
7736 int err;
7737
7738 do {
7739 err = nfs4_handle_exception(server,
7740 _nfs4_getdevicelist(server, fh, devlist),
7741 &exception);
7742 } while (exception.retry);
7743
7744 dprintk("%s: err=%d, num_devs=%u\n", __func__,
7745 err, devlist->num_devs);
7746
7747 return err;
7748}
7749EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7750
7751static int
7752_nfs4_proc_getdeviceinfo(struct nfs_server *server,
7753 struct pnfs_device *pdev,
7754 struct rpc_cred *cred)
7755{
7756 struct nfs4_getdeviceinfo_args args = {
7757 .pdev = pdev,
7758 };
7759 struct nfs4_getdeviceinfo_res res = {
7760 .pdev = pdev,
7761 };
7762 struct rpc_message msg = {
7763 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7764 .rpc_argp = &args,
7765 .rpc_resp = &res,
7766 .rpc_cred = cred,
7767 };
7768 int status;
7769
7770 dprintk("--> %s\n", __func__);
7771 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7772 dprintk("<-- %s status=%d\n", __func__, status);
7773
7774 return status;
7775}
7776
7777int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7778 struct pnfs_device *pdev,
7779 struct rpc_cred *cred)
7780{
7781 struct nfs4_exception exception = { };
7782 int err;
7783
7784 do {
7785 err = nfs4_handle_exception(server,
7786 _nfs4_proc_getdeviceinfo(server, pdev, cred),
7787 &exception);
7788 } while (exception.retry);
7789 return err;
7790}
7791EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7792
7793static void nfs4_layoutcommit_prepare(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 struct nfs4_session *session = nfs4_get_session(server);
7798
7799 nfs41_setup_sequence(session,
7800 &data->args.seq_args,
7801 &data->res.seq_res,
7802 task);
7803}
7804
7805static void
7806nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7807{
7808 struct nfs4_layoutcommit_data *data = calldata;
7809 struct nfs_server *server = NFS_SERVER(data->args.inode);
7810
7811 if (!nfs41_sequence_done(task, &data->res.seq_res))
7812 return;
7813
7814 switch (task->tk_status) { /* Just ignore these failures */
7815 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7816 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
7817 case -NFS4ERR_BADLAYOUT: /* no layout */
7818 case -NFS4ERR_GRACE: /* loca_recalim always false */
7819 task->tk_status = 0;
7820 case 0:
7821 break;
7822 default:
7823 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7824 rpc_restart_call_prepare(task);
7825 return;
7826 }
7827 }
7828}
7829
7830static void nfs4_layoutcommit_release(void *calldata)
7831{
7832 struct nfs4_layoutcommit_data *data = calldata;
7833
7834 pnfs_cleanup_layoutcommit(data);
7835 nfs_post_op_update_inode_force_wcc(data->args.inode,
7836 data->res.fattr);
7837 put_rpccred(data->cred);
7838 kfree(data);
7839}
7840
7841static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7842 .rpc_call_prepare = nfs4_layoutcommit_prepare,
7843 .rpc_call_done = nfs4_layoutcommit_done,
7844 .rpc_release = nfs4_layoutcommit_release,
7845};
7846
7847int
7848nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7849{
7850 struct rpc_message msg = {
7851 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7852 .rpc_argp = &data->args,
7853 .rpc_resp = &data->res,
7854 .rpc_cred = data->cred,
7855 };
7856 struct rpc_task_setup task_setup_data = {
7857 .task = &data->task,
7858 .rpc_client = NFS_CLIENT(data->args.inode),
7859 .rpc_message = &msg,
7860 .callback_ops = &nfs4_layoutcommit_ops,
7861 .callback_data = data,
7862 .flags = RPC_TASK_ASYNC,
7863 };
7864 struct rpc_task *task;
7865 int status = 0;
7866
7867 dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7868 "lbw: %llu inode %lu\n",
7869 data->task.tk_pid, sync,
7870 data->args.lastbytewritten,
7871 data->args.inode->i_ino);
7872
7873 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7874 task = rpc_run_task(&task_setup_data);
7875 if (IS_ERR(task))
7876 return PTR_ERR(task);
7877 if (sync == false)
7878 goto out;
7879 status = nfs4_wait_for_completion_rpc_task(task);
7880 if (status != 0)
7881 goto out;
7882 status = task->tk_status;
7883 trace_nfs4_layoutcommit(data->args.inode, status);
7884out:
7885 dprintk("%s: status %d\n", __func__, status);
7886 rpc_put_task(task);
7887 return status;
7888}
7889
7890/**
7891 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7892 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7893 */
7894static int
7895_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7896 struct nfs_fsinfo *info,
7897 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7898{
7899 struct nfs41_secinfo_no_name_args args = {
7900 .style = SECINFO_STYLE_CURRENT_FH,
7901 };
7902 struct nfs4_secinfo_res res = {
7903 .flavors = flavors,
7904 };
7905 struct rpc_message msg = {
7906 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7907 .rpc_argp = &args,
7908 .rpc_resp = &res,
7909 };
7910 struct rpc_clnt *clnt = server->client;
7911 struct rpc_cred *cred = NULL;
7912 int status;
7913
7914 if (use_integrity) {
7915 clnt = server->nfs_client->cl_rpcclient;
7916 cred = nfs4_get_clid_cred(server->nfs_client);
7917 msg.rpc_cred = cred;
7918 }
7919
7920 dprintk("--> %s\n", __func__);
7921 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7922 &res.seq_res, 0);
7923 dprintk("<-- %s status=%d\n", __func__, status);
7924
7925 if (cred)
7926 put_rpccred(cred);
7927
7928 return status;
7929}
7930
7931static int
7932nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7933 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7934{
7935 struct nfs4_exception exception = { };
7936 int err;
7937 do {
7938 /* first try using integrity protection */
7939 err = -NFS4ERR_WRONGSEC;
7940
7941 /* try to use integrity protection with machine cred */
7942 if (_nfs4_is_integrity_protected(server->nfs_client))
7943 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7944 flavors, true);
7945
7946 /*
7947 * if unable to use integrity protection, or SECINFO with
7948 * integrity protection returns NFS4ERR_WRONGSEC (which is
7949 * disallowed by spec, but exists in deployed servers) use
7950 * the current filesystem's rpc_client and the user cred.
7951 */
7952 if (err == -NFS4ERR_WRONGSEC)
7953 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7954 flavors, false);
7955
7956 switch (err) {
7957 case 0:
7958 case -NFS4ERR_WRONGSEC:
7959 case -ENOTSUPP:
7960 goto out;
7961 default:
7962 err = nfs4_handle_exception(server, err, &exception);
7963 }
7964 } while (exception.retry);
7965out:
7966 return err;
7967}
7968
7969static int
7970nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7971 struct nfs_fsinfo *info)
7972{
7973 int err;
7974 struct page *page;
7975 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7976 struct nfs4_secinfo_flavors *flavors;
7977 struct nfs4_secinfo4 *secinfo;
7978 int i;
7979
7980 page = alloc_page(GFP_KERNEL);
7981 if (!page) {
7982 err = -ENOMEM;
7983 goto out;
7984 }
7985
7986 flavors = page_address(page);
7987 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7988
7989 /*
7990 * Fall back on "guess and check" method if
7991 * the server doesn't support SECINFO_NO_NAME
7992 */
7993 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
7994 err = nfs4_find_root_sec(server, fhandle, info);
7995 goto out_freepage;
7996 }
7997 if (err)
7998 goto out_freepage;
7999
8000 for (i = 0; i < flavors->num_flavors; i++) {
8001 secinfo = &flavors->flavors[i];
8002
8003 switch (secinfo->flavor) {
8004 case RPC_AUTH_NULL:
8005 case RPC_AUTH_UNIX:
8006 case RPC_AUTH_GSS:
8007 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8008 &secinfo->flavor_info);
8009 break;
8010 default:
8011 flavor = RPC_AUTH_MAXFLAVOR;
8012 break;
8013 }
8014
8015 if (!nfs_auth_info_match(&server->auth_info, flavor))
8016 flavor = RPC_AUTH_MAXFLAVOR;
8017
8018 if (flavor != RPC_AUTH_MAXFLAVOR) {
8019 err = nfs4_lookup_root_sec(server, fhandle,
8020 info, flavor);
8021 if (!err)
8022 break;
8023 }
8024 }
8025
8026 if (flavor == RPC_AUTH_MAXFLAVOR)
8027 err = -EPERM;
8028
8029out_freepage:
8030 put_page(page);
8031 if (err == -EACCES)
8032 return -EPERM;
8033out:
8034 return err;
8035}
8036
8037static int _nfs41_test_stateid(struct nfs_server *server,
8038 nfs4_stateid *stateid,
8039 struct rpc_cred *cred)
8040{
8041 int status;
8042 struct nfs41_test_stateid_args args = {
8043 .stateid = stateid,
8044 };
8045 struct nfs41_test_stateid_res res;
8046 struct rpc_message msg = {
8047 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8048 .rpc_argp = &args,
8049 .rpc_resp = &res,
8050 .rpc_cred = cred,
8051 };
8052 struct rpc_clnt *rpc_client = server->client;
8053
8054 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8055 &rpc_client, &msg);
8056
8057 dprintk("NFS call test_stateid %p\n", stateid);
8058 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8059 nfs4_set_sequence_privileged(&args.seq_args);
8060 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8061 &args.seq_args, &res.seq_res);
8062 if (status != NFS_OK) {
8063 dprintk("NFS reply test_stateid: failed, %d\n", status);
8064 return status;
8065 }
8066 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8067 return -res.status;
8068}
8069
8070/**
8071 * nfs41_test_stateid - perform a TEST_STATEID operation
8072 *
8073 * @server: server / transport on which to perform the operation
8074 * @stateid: state ID to test
8075 * @cred: credential
8076 *
8077 * Returns NFS_OK if the server recognizes that "stateid" is valid.
8078 * Otherwise a negative NFS4ERR value is returned if the operation
8079 * failed or the state ID is not currently valid.
8080 */
8081static int nfs41_test_stateid(struct nfs_server *server,
8082 nfs4_stateid *stateid,
8083 struct rpc_cred *cred)
8084{
8085 struct nfs4_exception exception = { };
8086 int err;
8087 do {
8088 err = _nfs41_test_stateid(server, stateid, cred);
8089 if (err != -NFS4ERR_DELAY)
8090 break;
8091 nfs4_handle_exception(server, err, &exception);
8092 } while (exception.retry);
8093 return err;
8094}
8095
8096struct nfs_free_stateid_data {
8097 struct nfs_server *server;
8098 struct nfs41_free_stateid_args args;
8099 struct nfs41_free_stateid_res res;
8100};
8101
8102static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8103{
8104 struct nfs_free_stateid_data *data = calldata;
8105 nfs41_setup_sequence(nfs4_get_session(data->server),
8106 &data->args.seq_args,
8107 &data->res.seq_res,
8108 task);
8109}
8110
8111static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8112{
8113 struct nfs_free_stateid_data *data = calldata;
8114
8115 nfs41_sequence_done(task, &data->res.seq_res);
8116
8117 switch (task->tk_status) {
8118 case -NFS4ERR_DELAY:
8119 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8120 rpc_restart_call_prepare(task);
8121 }
8122}
8123
8124static void nfs41_free_stateid_release(void *calldata)
8125{
8126 kfree(calldata);
8127}
8128
8129static const struct rpc_call_ops nfs41_free_stateid_ops = {
8130 .rpc_call_prepare = nfs41_free_stateid_prepare,
8131 .rpc_call_done = nfs41_free_stateid_done,
8132 .rpc_release = nfs41_free_stateid_release,
8133};
8134
8135static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8136 nfs4_stateid *stateid,
8137 struct rpc_cred *cred,
8138 bool privileged)
8139{
8140 struct rpc_message msg = {
8141 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8142 .rpc_cred = cred,
8143 };
8144 struct rpc_task_setup task_setup = {
8145 .rpc_client = server->client,
8146 .rpc_message = &msg,
8147 .callback_ops = &nfs41_free_stateid_ops,
8148 .flags = RPC_TASK_ASYNC,
8149 };
8150 struct nfs_free_stateid_data *data;
8151
8152 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8153 &task_setup.rpc_client, &msg);
8154
8155 dprintk("NFS call free_stateid %p\n", stateid);
8156 data = kmalloc(sizeof(*data), GFP_NOFS);
8157 if (!data)
8158 return ERR_PTR(-ENOMEM);
8159 data->server = server;
8160 nfs4_stateid_copy(&data->args.stateid, stateid);
8161
8162 task_setup.callback_data = data;
8163
8164 msg.rpc_argp = &data->args;
8165 msg.rpc_resp = &data->res;
8166 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8167 if (privileged)
8168 nfs4_set_sequence_privileged(&data->args.seq_args);
8169
8170 return rpc_run_task(&task_setup);
8171}
8172
8173/**
8174 * nfs41_free_stateid - perform a FREE_STATEID operation
8175 *
8176 * @server: server / transport on which to perform the operation
8177 * @stateid: state ID to release
8178 * @cred: credential
8179 *
8180 * Returns NFS_OK if the server freed "stateid". Otherwise a
8181 * negative NFS4ERR value is returned.
8182 */
8183static int nfs41_free_stateid(struct nfs_server *server,
8184 nfs4_stateid *stateid,
8185 struct rpc_cred *cred)
8186{
8187 struct rpc_task *task;
8188 int ret;
8189
8190 task = _nfs41_free_stateid(server, stateid, cred, true);
8191 if (IS_ERR(task))
8192 return PTR_ERR(task);
8193 ret = rpc_wait_for_completion_task(task);
8194 if (!ret)
8195 ret = task->tk_status;
8196 rpc_put_task(task);
8197 return ret;
8198}
8199
8200static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8201{
8202 struct rpc_task *task;
8203 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8204
8205 task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8206 nfs4_free_lock_state(server, lsp);
8207 if (IS_ERR(task))
8208 return PTR_ERR(task);
8209 rpc_put_task(task);
8210 return 0;
8211}
8212
8213static bool nfs41_match_stateid(const nfs4_stateid *s1,
8214 const nfs4_stateid *s2)
8215{
8216 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8217 return false;
8218
8219 if (s1->seqid == s2->seqid)
8220 return true;
8221 if (s1->seqid == 0 || s2->seqid == 0)
8222 return true;
8223
8224 return false;
8225}
8226
8227#endif /* CONFIG_NFS_V4_1 */
8228
8229static bool nfs4_match_stateid(const nfs4_stateid *s1,
8230 const nfs4_stateid *s2)
8231{
8232 return nfs4_stateid_match(s1, s2);
8233}
8234
8235
8236static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8237 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8238 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8239 .recover_open = nfs4_open_reclaim,
8240 .recover_lock = nfs4_lock_reclaim,
8241 .establish_clid = nfs4_init_clientid,
8242 .detect_trunking = nfs40_discover_server_trunking,
8243};
8244
8245#if defined(CONFIG_NFS_V4_1)
8246static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8247 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8248 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8249 .recover_open = nfs4_open_reclaim,
8250 .recover_lock = nfs4_lock_reclaim,
8251 .establish_clid = nfs41_init_clientid,
8252 .reclaim_complete = nfs41_proc_reclaim_complete,
8253 .detect_trunking = nfs41_discover_server_trunking,
8254};
8255#endif /* CONFIG_NFS_V4_1 */
8256
8257static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8258 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8259 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8260 .recover_open = nfs4_open_expired,
8261 .recover_lock = nfs4_lock_expired,
8262 .establish_clid = nfs4_init_clientid,
8263};
8264
8265#if defined(CONFIG_NFS_V4_1)
8266static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8267 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8268 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8269 .recover_open = nfs41_open_expired,
8270 .recover_lock = nfs41_lock_expired,
8271 .establish_clid = nfs41_init_clientid,
8272};
8273#endif /* CONFIG_NFS_V4_1 */
8274
8275static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8276 .sched_state_renewal = nfs4_proc_async_renew,
8277 .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8278 .renew_lease = nfs4_proc_renew,
8279};
8280
8281#if defined(CONFIG_NFS_V4_1)
8282static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8283 .sched_state_renewal = nfs41_proc_async_sequence,
8284 .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8285 .renew_lease = nfs4_proc_sequence,
8286};
8287#endif
8288
8289static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8290 .get_locations = _nfs40_proc_get_locations,
8291 .fsid_present = _nfs40_proc_fsid_present,
8292};
8293
8294#if defined(CONFIG_NFS_V4_1)
8295static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8296 .get_locations = _nfs41_proc_get_locations,
8297 .fsid_present = _nfs41_proc_fsid_present,
8298};
8299#endif /* CONFIG_NFS_V4_1 */
8300
8301static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8302 .minor_version = 0,
8303 .init_caps = NFS_CAP_READDIRPLUS
8304 | NFS_CAP_ATOMIC_OPEN
8305 | NFS_CAP_CHANGE_ATTR
8306 | NFS_CAP_POSIX_LOCK,
8307 .init_client = nfs40_init_client,
8308 .shutdown_client = nfs40_shutdown_client,
8309 .match_stateid = nfs4_match_stateid,
8310 .find_root_sec = nfs4_find_root_sec,
8311 .free_lock_state = nfs4_release_lockowner,
8312 .call_sync_ops = &nfs40_call_sync_ops,
8313 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8314 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8315 .state_renewal_ops = &nfs40_state_renewal_ops,
8316 .mig_recovery_ops = &nfs40_mig_recovery_ops,
8317};
8318
8319#if defined(CONFIG_NFS_V4_1)
8320static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8321 .minor_version = 1,
8322 .init_caps = NFS_CAP_READDIRPLUS
8323 | NFS_CAP_ATOMIC_OPEN
8324 | NFS_CAP_CHANGE_ATTR
8325 | NFS_CAP_POSIX_LOCK
8326 | NFS_CAP_STATEID_NFSV41
8327 | NFS_CAP_ATOMIC_OPEN_V1,
8328 .init_client = nfs41_init_client,
8329 .shutdown_client = nfs41_shutdown_client,
8330 .match_stateid = nfs41_match_stateid,
8331 .find_root_sec = nfs41_find_root_sec,
8332 .free_lock_state = nfs41_free_lock_state,
8333 .call_sync_ops = &nfs41_call_sync_ops,
8334 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8335 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8336 .state_renewal_ops = &nfs41_state_renewal_ops,
8337 .mig_recovery_ops = &nfs41_mig_recovery_ops,
8338};
8339#endif
8340
8341#if defined(CONFIG_NFS_V4_2)
8342static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8343 .minor_version = 2,
8344 .init_caps = NFS_CAP_READDIRPLUS
8345 | NFS_CAP_ATOMIC_OPEN
8346 | NFS_CAP_CHANGE_ATTR
8347 | NFS_CAP_POSIX_LOCK
8348 | NFS_CAP_STATEID_NFSV41
8349 | NFS_CAP_ATOMIC_OPEN_V1,
8350 .init_client = nfs41_init_client,
8351 .shutdown_client = nfs41_shutdown_client,
8352 .match_stateid = nfs41_match_stateid,
8353 .find_root_sec = nfs41_find_root_sec,
8354 .free_lock_state = nfs41_free_lock_state,
8355 .call_sync_ops = &nfs41_call_sync_ops,
8356 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8357 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8358 .state_renewal_ops = &nfs41_state_renewal_ops,
8359};
8360#endif
8361
8362const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8363 [0] = &nfs_v4_0_minor_ops,
8364#if defined(CONFIG_NFS_V4_1)
8365 [1] = &nfs_v4_1_minor_ops,
8366#endif
8367#if defined(CONFIG_NFS_V4_2)
8368 [2] = &nfs_v4_2_minor_ops,
8369#endif
8370};
8371
8372static const struct inode_operations nfs4_dir_inode_operations = {
8373 .create = nfs_create,
8374 .lookup = nfs_lookup,
8375 .atomic_open = nfs_atomic_open,
8376 .link = nfs_link,
8377 .unlink = nfs_unlink,
8378 .symlink = nfs_symlink,
8379 .mkdir = nfs_mkdir,
8380 .rmdir = nfs_rmdir,
8381 .mknod = nfs_mknod,
8382 .rename = nfs_rename,
8383 .permission = nfs_permission,
8384 .getattr = nfs_getattr,
8385 .setattr = nfs_setattr,
8386 .getxattr = generic_getxattr,
8387 .setxattr = generic_setxattr,
8388 .listxattr = generic_listxattr,
8389 .removexattr = generic_removexattr,
8390};
8391
8392static const struct inode_operations nfs4_file_inode_operations = {
8393 .permission = nfs_permission,
8394 .getattr = nfs_getattr,
8395 .setattr = nfs_setattr,
8396 .getxattr = generic_getxattr,
8397 .setxattr = generic_setxattr,
8398 .listxattr = generic_listxattr,
8399 .removexattr = generic_removexattr,
8400};
8401
8402const struct nfs_rpc_ops nfs_v4_clientops = {
8403 .version = 4, /* protocol version */
8404 .dentry_ops = &nfs4_dentry_operations,
8405 .dir_inode_ops = &nfs4_dir_inode_operations,
8406 .file_inode_ops = &nfs4_file_inode_operations,
8407 .file_ops = &nfs4_file_operations,
8408 .getroot = nfs4_proc_get_root,
8409 .submount = nfs4_submount,
8410 .try_mount = nfs4_try_mount,
8411 .getattr = nfs4_proc_getattr,
8412 .setattr = nfs4_proc_setattr,
8413 .lookup = nfs4_proc_lookup,
8414 .access = nfs4_proc_access,
8415 .readlink = nfs4_proc_readlink,
8416 .create = nfs4_proc_create,
8417 .remove = nfs4_proc_remove,
8418 .unlink_setup = nfs4_proc_unlink_setup,
8419 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8420 .unlink_done = nfs4_proc_unlink_done,
8421 .rename_setup = nfs4_proc_rename_setup,
8422 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8423 .rename_done = nfs4_proc_rename_done,
8424 .link = nfs4_proc_link,
8425 .symlink = nfs4_proc_symlink,
8426 .mkdir = nfs4_proc_mkdir,
8427 .rmdir = nfs4_proc_remove,
8428 .readdir = nfs4_proc_readdir,
8429 .mknod = nfs4_proc_mknod,
8430 .statfs = nfs4_proc_statfs,
8431 .fsinfo = nfs4_proc_fsinfo,
8432 .pathconf = nfs4_proc_pathconf,
8433 .set_capabilities = nfs4_server_capabilities,
8434 .decode_dirent = nfs4_decode_dirent,
8435 .read_setup = nfs4_proc_read_setup,
8436 .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8437 .read_done = nfs4_read_done,
8438 .write_setup = nfs4_proc_write_setup,
8439 .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8440 .write_done = nfs4_write_done,
8441 .commit_setup = nfs4_proc_commit_setup,
8442 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8443 .commit_done = nfs4_commit_done,
8444 .lock = nfs4_proc_lock,
8445 .clear_acl_cache = nfs4_zap_acl_attr,
8446 .close_context = nfs4_close_context,
8447 .open_context = nfs4_atomic_open,
8448 .have_delegation = nfs4_have_delegation,
8449 .return_delegation = nfs4_inode_return_delegation,
8450 .alloc_client = nfs4_alloc_client,
8451 .init_client = nfs4_init_client,
8452 .free_client = nfs4_free_client,
8453 .create_server = nfs4_create_server,
8454 .clone_server = nfs_clone_server,
8455};
8456
8457static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8458 .prefix = XATTR_NAME_NFSV4_ACL,
8459 .list = nfs4_xattr_list_nfs4_acl,
8460 .get = nfs4_xattr_get_nfs4_acl,
8461 .set = nfs4_xattr_set_nfs4_acl,
8462};
8463
8464const struct xattr_handler *nfs4_xattr_handlers[] = {
8465 &nfs4_xattr_nfs4_acl_handler,
8466#ifdef CONFIG_NFS_V4_SECURITY_LABEL
8467 &nfs4_xattr_nfs4_label_handler,
8468#endif
8469 NULL
8470};
8471
8472/*
8473 * Local variables:
8474 * c-basic-offset: 8
8475 * End:
8476 */
Linux 6.x block layer and io_uring tree(s)