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1/*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR 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 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
41#include <linux/kernel.h>
42#include <linux/slab.h>
43#include <linux/fs.h>
44#include <linux/nfs_fs.h>
45#include <linux/kthread.h>
46#include <linux/module.h>
47#include <linux/random.h>
48#include <linux/ratelimit.h>
49#include <linux/workqueue.h>
50#include <linux/bitops.h>
51#include <linux/jiffies.h>
52
53#include <linux/sunrpc/clnt.h>
54
55#include "nfs4_fs.h"
56#include "callback.h"
57#include "delegation.h"
58#include "internal.h"
59#include "nfs4idmap.h"
60#include "nfs4session.h"
61#include "pnfs.h"
62#include "netns.h"
63#include "nfs4trace.h"
64
65#define NFSDBG_FACILITY NFSDBG_STATE
66
67#define OPENOWNER_POOL_SIZE 8
68
69const nfs4_stateid zero_stateid = {
70 { .data = { 0 } },
71 .type = NFS4_SPECIAL_STATEID_TYPE,
72};
73const nfs4_stateid invalid_stateid = {
74 {
75 /* Funky initialiser keeps older gcc versions happy */
76 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
77 },
78 .type = NFS4_INVALID_STATEID_TYPE,
79};
80
81const nfs4_stateid current_stateid = {
82 {
83 /* Funky initialiser keeps older gcc versions happy */
84 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
85 },
86 .type = NFS4_SPECIAL_STATEID_TYPE,
87};
88
89static DEFINE_MUTEX(nfs_clid_init_mutex);
90
91static int nfs4_setup_state_renewal(struct nfs_client *clp)
92{
93 int status;
94 struct nfs_fsinfo fsinfo;
95
96 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
97 nfs4_schedule_state_renewal(clp);
98 return 0;
99 }
100
101 status = nfs4_proc_get_lease_time(clp, &fsinfo);
102 if (status == 0) {
103 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
104 nfs4_schedule_state_renewal(clp);
105 }
106
107 return status;
108}
109
110int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
111{
112 struct nfs4_setclientid_res clid = {
113 .clientid = clp->cl_clientid,
114 .confirm = clp->cl_confirm,
115 };
116 unsigned short port;
117 int status;
118 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
119
120 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
121 goto do_confirm;
122 port = nn->nfs_callback_tcpport;
123 if (clp->cl_addr.ss_family == AF_INET6)
124 port = nn->nfs_callback_tcpport6;
125
126 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
127 if (status != 0)
128 goto out;
129 clp->cl_clientid = clid.clientid;
130 clp->cl_confirm = clid.confirm;
131 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
132do_confirm:
133 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
134 if (status != 0)
135 goto out;
136 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
137 nfs4_setup_state_renewal(clp);
138out:
139 return status;
140}
141
142/**
143 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
144 *
145 * @clp: nfs_client under test
146 * @result: OUT: found nfs_client, or clp
147 * @cred: credential to use for trunking test
148 *
149 * Returns zero, a negative errno, or a negative NFS4ERR status.
150 * If zero is returned, an nfs_client pointer is planted in
151 * "result".
152 *
153 * Note: The returned client may not yet be marked ready.
154 */
155int nfs40_discover_server_trunking(struct nfs_client *clp,
156 struct nfs_client **result,
157 const struct cred *cred)
158{
159 struct nfs4_setclientid_res clid = {
160 .clientid = clp->cl_clientid,
161 .confirm = clp->cl_confirm,
162 };
163 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
164 unsigned short port;
165 int status;
166
167 port = nn->nfs_callback_tcpport;
168 if (clp->cl_addr.ss_family == AF_INET6)
169 port = nn->nfs_callback_tcpport6;
170
171 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
172 if (status != 0)
173 goto out;
174 clp->cl_clientid = clid.clientid;
175 clp->cl_confirm = clid.confirm;
176
177 status = nfs40_walk_client_list(clp, result, cred);
178 if (status == 0) {
179 /* Sustain the lease, even if it's empty. If the clientid4
180 * goes stale it's of no use for trunking discovery. */
181 nfs4_schedule_state_renewal(*result);
182
183 /* If the client state need to recover, do it. */
184 if (clp->cl_state)
185 nfs4_schedule_state_manager(clp);
186 }
187out:
188 return status;
189}
190
191const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
192{
193 return get_cred(rpc_machine_cred());
194}
195
196static void nfs4_root_machine_cred(struct nfs_client *clp)
197{
198
199 /* Force root creds instead of machine */
200 clp->cl_principal = NULL;
201 clp->cl_rpcclient->cl_principal = NULL;
202}
203
204static const struct cred *
205nfs4_get_renew_cred_server_locked(struct nfs_server *server)
206{
207 const struct cred *cred = NULL;
208 struct nfs4_state_owner *sp;
209 struct rb_node *pos;
210
211 for (pos = rb_first(&server->state_owners);
212 pos != NULL;
213 pos = rb_next(pos)) {
214 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
215 if (list_empty(&sp->so_states))
216 continue;
217 cred = get_cred(sp->so_cred);
218 break;
219 }
220 return cred;
221}
222
223/**
224 * nfs4_get_renew_cred - Acquire credential for a renew operation
225 * @clp: client state handle
226 *
227 * Returns an rpc_cred with reference count bumped, or NULL.
228 * Caller must hold clp->cl_lock.
229 */
230const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
231{
232 const struct cred *cred = NULL;
233 struct nfs_server *server;
234
235 /* Use machine credentials if available */
236 cred = nfs4_get_machine_cred(clp);
237 if (cred != NULL)
238 goto out;
239
240 spin_lock(&clp->cl_lock);
241 rcu_read_lock();
242 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
243 cred = nfs4_get_renew_cred_server_locked(server);
244 if (cred != NULL)
245 break;
246 }
247 rcu_read_unlock();
248 spin_unlock(&clp->cl_lock);
249
250out:
251 return cred;
252}
253
254static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
255{
256 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
257 spin_lock(&tbl->slot_tbl_lock);
258 nfs41_wake_slot_table(tbl);
259 spin_unlock(&tbl->slot_tbl_lock);
260 }
261}
262
263static void nfs4_end_drain_session(struct nfs_client *clp)
264{
265 struct nfs4_session *ses = clp->cl_session;
266
267 if (clp->cl_slot_tbl) {
268 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
269 return;
270 }
271
272 if (ses != NULL) {
273 nfs4_end_drain_slot_table(&ses->bc_slot_table);
274 nfs4_end_drain_slot_table(&ses->fc_slot_table);
275 }
276}
277
278static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
279{
280 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
281 spin_lock(&tbl->slot_tbl_lock);
282 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
283 reinit_completion(&tbl->complete);
284 spin_unlock(&tbl->slot_tbl_lock);
285 return wait_for_completion_interruptible(&tbl->complete);
286 }
287 spin_unlock(&tbl->slot_tbl_lock);
288 return 0;
289}
290
291static int nfs4_begin_drain_session(struct nfs_client *clp)
292{
293 struct nfs4_session *ses = clp->cl_session;
294 int ret;
295
296 if (clp->cl_slot_tbl)
297 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
298
299 /* back channel */
300 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
301 if (ret)
302 return ret;
303 /* fore channel */
304 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
305}
306
307#if defined(CONFIG_NFS_V4_1)
308
309static void nfs41_finish_session_reset(struct nfs_client *clp)
310{
311 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
312 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
313 /* create_session negotiated new slot table */
314 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
315 nfs4_setup_state_renewal(clp);
316}
317
318int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
319{
320 int status;
321
322 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
323 goto do_confirm;
324 status = nfs4_proc_exchange_id(clp, cred);
325 if (status != 0)
326 goto out;
327 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
328do_confirm:
329 status = nfs4_proc_create_session(clp, cred);
330 if (status != 0)
331 goto out;
332 nfs41_finish_session_reset(clp);
333 nfs_mark_client_ready(clp, NFS_CS_READY);
334out:
335 return status;
336}
337
338/**
339 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
340 *
341 * @clp: nfs_client under test
342 * @result: OUT: found nfs_client, or clp
343 * @cred: credential to use for trunking test
344 *
345 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
346 * If NFS4_OK is returned, an nfs_client pointer is planted in
347 * "result".
348 *
349 * Note: The returned client may not yet be marked ready.
350 */
351int nfs41_discover_server_trunking(struct nfs_client *clp,
352 struct nfs_client **result,
353 const struct cred *cred)
354{
355 int status;
356
357 status = nfs4_proc_exchange_id(clp, cred);
358 if (status != NFS4_OK)
359 return status;
360
361 status = nfs41_walk_client_list(clp, result, cred);
362 if (status < 0)
363 return status;
364 if (clp != *result)
365 return 0;
366
367 /*
368 * Purge state if the client id was established in a prior
369 * instance and the client id could not have arrived on the
370 * server via Transparent State Migration.
371 */
372 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
373 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
374 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
375 else
376 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
377 }
378 nfs4_schedule_state_manager(clp);
379 status = nfs_wait_client_init_complete(clp);
380 if (status < 0)
381 nfs_put_client(clp);
382 return status;
383}
384
385#endif /* CONFIG_NFS_V4_1 */
386
387/**
388 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
389 * @clp: client state handle
390 *
391 * Returns a cred with reference count bumped, or NULL.
392 */
393const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
394{
395 const struct cred *cred;
396
397 cred = nfs4_get_machine_cred(clp);
398 return cred;
399}
400
401static struct nfs4_state_owner *
402nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
403{
404 struct rb_node **p = &server->state_owners.rb_node,
405 *parent = NULL;
406 struct nfs4_state_owner *sp;
407 int cmp;
408
409 while (*p != NULL) {
410 parent = *p;
411 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
412 cmp = cred_fscmp(cred, sp->so_cred);
413
414 if (cmp < 0)
415 p = &parent->rb_left;
416 else if (cmp > 0)
417 p = &parent->rb_right;
418 else {
419 if (!list_empty(&sp->so_lru))
420 list_del_init(&sp->so_lru);
421 atomic_inc(&sp->so_count);
422 return sp;
423 }
424 }
425 return NULL;
426}
427
428static struct nfs4_state_owner *
429nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
430{
431 struct nfs_server *server = new->so_server;
432 struct rb_node **p = &server->state_owners.rb_node,
433 *parent = NULL;
434 struct nfs4_state_owner *sp;
435 int cmp;
436
437 while (*p != NULL) {
438 parent = *p;
439 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
440 cmp = cred_fscmp(new->so_cred, sp->so_cred);
441
442 if (cmp < 0)
443 p = &parent->rb_left;
444 else if (cmp > 0)
445 p = &parent->rb_right;
446 else {
447 if (!list_empty(&sp->so_lru))
448 list_del_init(&sp->so_lru);
449 atomic_inc(&sp->so_count);
450 return sp;
451 }
452 }
453 rb_link_node(&new->so_server_node, parent, p);
454 rb_insert_color(&new->so_server_node, &server->state_owners);
455 return new;
456}
457
458static void
459nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
460{
461 struct nfs_server *server = sp->so_server;
462
463 if (!RB_EMPTY_NODE(&sp->so_server_node))
464 rb_erase(&sp->so_server_node, &server->state_owners);
465}
466
467static void
468nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
469{
470 sc->create_time = ktime_get();
471 sc->flags = 0;
472 sc->counter = 0;
473 spin_lock_init(&sc->lock);
474 INIT_LIST_HEAD(&sc->list);
475 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
476}
477
478static void
479nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
480{
481 rpc_destroy_wait_queue(&sc->wait);
482}
483
484/*
485 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
486 * create a new state_owner.
487 *
488 */
489static struct nfs4_state_owner *
490nfs4_alloc_state_owner(struct nfs_server *server,
491 const struct cred *cred,
492 gfp_t gfp_flags)
493{
494 struct nfs4_state_owner *sp;
495
496 sp = kzalloc(sizeof(*sp), gfp_flags);
497 if (!sp)
498 return NULL;
499 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
500 gfp_flags);
501 if (sp->so_seqid.owner_id < 0) {
502 kfree(sp);
503 return NULL;
504 }
505 sp->so_server = server;
506 sp->so_cred = get_cred(cred);
507 spin_lock_init(&sp->so_lock);
508 INIT_LIST_HEAD(&sp->so_states);
509 nfs4_init_seqid_counter(&sp->so_seqid);
510 atomic_set(&sp->so_count, 1);
511 INIT_LIST_HEAD(&sp->so_lru);
512 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
513 mutex_init(&sp->so_delegreturn_mutex);
514 return sp;
515}
516
517static void
518nfs4_reset_state_owner(struct nfs4_state_owner *sp)
519{
520 /* This state_owner is no longer usable, but must
521 * remain in place so that state recovery can find it
522 * and the opens associated with it.
523 * It may also be used for new 'open' request to
524 * return a delegation to the server.
525 * So update the 'create_time' so that it looks like
526 * a new state_owner. This will cause the server to
527 * request an OPEN_CONFIRM to start a new sequence.
528 */
529 sp->so_seqid.create_time = ktime_get();
530}
531
532static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
533{
534 nfs4_destroy_seqid_counter(&sp->so_seqid);
535 put_cred(sp->so_cred);
536 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
537 kfree(sp);
538}
539
540static void nfs4_gc_state_owners(struct nfs_server *server)
541{
542 struct nfs_client *clp = server->nfs_client;
543 struct nfs4_state_owner *sp, *tmp;
544 unsigned long time_min, time_max;
545 LIST_HEAD(doomed);
546
547 spin_lock(&clp->cl_lock);
548 time_max = jiffies;
549 time_min = (long)time_max - (long)clp->cl_lease_time;
550 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
551 /* NB: LRU is sorted so that oldest is at the head */
552 if (time_in_range(sp->so_expires, time_min, time_max))
553 break;
554 list_move(&sp->so_lru, &doomed);
555 nfs4_remove_state_owner_locked(sp);
556 }
557 spin_unlock(&clp->cl_lock);
558
559 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
560 list_del(&sp->so_lru);
561 nfs4_free_state_owner(sp);
562 }
563}
564
565/**
566 * nfs4_get_state_owner - Look up a state owner given a credential
567 * @server: nfs_server to search
568 * @cred: RPC credential to match
569 * @gfp_flags: allocation mode
570 *
571 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
572 */
573struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
574 const struct cred *cred,
575 gfp_t gfp_flags)
576{
577 struct nfs_client *clp = server->nfs_client;
578 struct nfs4_state_owner *sp, *new;
579
580 spin_lock(&clp->cl_lock);
581 sp = nfs4_find_state_owner_locked(server, cred);
582 spin_unlock(&clp->cl_lock);
583 if (sp != NULL)
584 goto out;
585 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
586 if (new == NULL)
587 goto out;
588 spin_lock(&clp->cl_lock);
589 sp = nfs4_insert_state_owner_locked(new);
590 spin_unlock(&clp->cl_lock);
591 if (sp != new)
592 nfs4_free_state_owner(new);
593out:
594 nfs4_gc_state_owners(server);
595 return sp;
596}
597
598/**
599 * nfs4_put_state_owner - Release a nfs4_state_owner
600 * @sp: state owner data to release
601 *
602 * Note that we keep released state owners on an LRU
603 * list.
604 * This caches valid state owners so that they can be
605 * reused, to avoid the OPEN_CONFIRM on minor version 0.
606 * It also pins the uniquifier of dropped state owners for
607 * a while, to ensure that those state owner names are
608 * never reused.
609 */
610void nfs4_put_state_owner(struct nfs4_state_owner *sp)
611{
612 struct nfs_server *server = sp->so_server;
613 struct nfs_client *clp = server->nfs_client;
614
615 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
616 return;
617
618 sp->so_expires = jiffies;
619 list_add_tail(&sp->so_lru, &server->state_owners_lru);
620 spin_unlock(&clp->cl_lock);
621}
622
623/**
624 * nfs4_purge_state_owners - Release all cached state owners
625 * @server: nfs_server with cached state owners to release
626 * @head: resulting list of state owners
627 *
628 * Called at umount time. Remaining state owners will be on
629 * the LRU with ref count of zero.
630 * Note that the state owners are not freed, but are added
631 * to the list @head, which can later be used as an argument
632 * to nfs4_free_state_owners.
633 */
634void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
635{
636 struct nfs_client *clp = server->nfs_client;
637 struct nfs4_state_owner *sp, *tmp;
638
639 spin_lock(&clp->cl_lock);
640 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
641 list_move(&sp->so_lru, head);
642 nfs4_remove_state_owner_locked(sp);
643 }
644 spin_unlock(&clp->cl_lock);
645}
646
647/**
648 * nfs4_free_state_owners - Release all cached state owners
649 * @head: resulting list of state owners
650 *
651 * Frees a list of state owners that was generated by
652 * nfs4_purge_state_owners
653 */
654void nfs4_free_state_owners(struct list_head *head)
655{
656 struct nfs4_state_owner *sp, *tmp;
657
658 list_for_each_entry_safe(sp, tmp, head, so_lru) {
659 list_del(&sp->so_lru);
660 nfs4_free_state_owner(sp);
661 }
662}
663
664static struct nfs4_state *
665nfs4_alloc_open_state(void)
666{
667 struct nfs4_state *state;
668
669 state = kzalloc(sizeof(*state), GFP_NOFS);
670 if (!state)
671 return NULL;
672 refcount_set(&state->count, 1);
673 INIT_LIST_HEAD(&state->lock_states);
674 spin_lock_init(&state->state_lock);
675 seqlock_init(&state->seqlock);
676 init_waitqueue_head(&state->waitq);
677 return state;
678}
679
680void
681nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
682{
683 if (state->state == fmode)
684 return;
685 /* NB! List reordering - see the reclaim code for why. */
686 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
687 if (fmode & FMODE_WRITE)
688 list_move(&state->open_states, &state->owner->so_states);
689 else
690 list_move_tail(&state->open_states, &state->owner->so_states);
691 }
692 state->state = fmode;
693}
694
695static struct nfs4_state *
696__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
697{
698 struct nfs_inode *nfsi = NFS_I(inode);
699 struct nfs4_state *state;
700
701 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
702 if (state->owner != owner)
703 continue;
704 if (!nfs4_valid_open_stateid(state))
705 continue;
706 if (refcount_inc_not_zero(&state->count))
707 return state;
708 }
709 return NULL;
710}
711
712static void
713nfs4_free_open_state(struct nfs4_state *state)
714{
715 kfree_rcu(state, rcu_head);
716}
717
718struct nfs4_state *
719nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
720{
721 struct nfs4_state *state, *new;
722 struct nfs_inode *nfsi = NFS_I(inode);
723
724 rcu_read_lock();
725 state = __nfs4_find_state_byowner(inode, owner);
726 rcu_read_unlock();
727 if (state)
728 goto out;
729 new = nfs4_alloc_open_state();
730 spin_lock(&owner->so_lock);
731 spin_lock(&inode->i_lock);
732 state = __nfs4_find_state_byowner(inode, owner);
733 if (state == NULL && new != NULL) {
734 state = new;
735 state->owner = owner;
736 atomic_inc(&owner->so_count);
737 ihold(inode);
738 state->inode = inode;
739 list_add_rcu(&state->inode_states, &nfsi->open_states);
740 spin_unlock(&inode->i_lock);
741 /* Note: The reclaim code dictates that we add stateless
742 * and read-only stateids to the end of the list */
743 list_add_tail(&state->open_states, &owner->so_states);
744 spin_unlock(&owner->so_lock);
745 } else {
746 spin_unlock(&inode->i_lock);
747 spin_unlock(&owner->so_lock);
748 if (new)
749 nfs4_free_open_state(new);
750 }
751out:
752 return state;
753}
754
755void nfs4_put_open_state(struct nfs4_state *state)
756{
757 struct inode *inode = state->inode;
758 struct nfs4_state_owner *owner = state->owner;
759
760 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
761 return;
762 spin_lock(&inode->i_lock);
763 list_del_rcu(&state->inode_states);
764 list_del(&state->open_states);
765 spin_unlock(&inode->i_lock);
766 spin_unlock(&owner->so_lock);
767 nfs4_inode_return_delegation_on_close(inode);
768 iput(inode);
769 nfs4_free_open_state(state);
770 nfs4_put_state_owner(owner);
771}
772
773/*
774 * Close the current file.
775 */
776static void __nfs4_close(struct nfs4_state *state,
777 fmode_t fmode, gfp_t gfp_mask, int wait)
778{
779 struct nfs4_state_owner *owner = state->owner;
780 int call_close = 0;
781 fmode_t newstate;
782
783 atomic_inc(&owner->so_count);
784 /* Protect against nfs4_find_state() */
785 spin_lock(&owner->so_lock);
786 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
787 case FMODE_READ:
788 state->n_rdonly--;
789 break;
790 case FMODE_WRITE:
791 state->n_wronly--;
792 break;
793 case FMODE_READ|FMODE_WRITE:
794 state->n_rdwr--;
795 }
796 newstate = FMODE_READ|FMODE_WRITE;
797 if (state->n_rdwr == 0) {
798 if (state->n_rdonly == 0) {
799 newstate &= ~FMODE_READ;
800 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
801 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
802 }
803 if (state->n_wronly == 0) {
804 newstate &= ~FMODE_WRITE;
805 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
806 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
807 }
808 if (newstate == 0)
809 clear_bit(NFS_DELEGATED_STATE, &state->flags);
810 }
811 nfs4_state_set_mode_locked(state, newstate);
812 spin_unlock(&owner->so_lock);
813
814 if (!call_close) {
815 nfs4_put_open_state(state);
816 nfs4_put_state_owner(owner);
817 } else
818 nfs4_do_close(state, gfp_mask, wait);
819}
820
821void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
822{
823 __nfs4_close(state, fmode, GFP_NOFS, 0);
824}
825
826void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
827{
828 __nfs4_close(state, fmode, GFP_KERNEL, 1);
829}
830
831/*
832 * Search the state->lock_states for an existing lock_owner
833 * that is compatible with either of the given owners.
834 * If the second is non-zero, then the first refers to a Posix-lock
835 * owner (current->files) and the second refers to a flock/OFD
836 * owner (struct file*). In that case, prefer a match for the first
837 * owner.
838 * If both sorts of locks are held on the one file we cannot know
839 * which stateid was intended to be used, so a "correct" choice cannot
840 * be made. Failing that, a "consistent" choice is preferable. The
841 * consistent choice we make is to prefer the first owner, that of a
842 * Posix lock.
843 */
844static struct nfs4_lock_state *
845__nfs4_find_lock_state(struct nfs4_state *state,
846 fl_owner_t fl_owner, fl_owner_t fl_owner2)
847{
848 struct nfs4_lock_state *pos, *ret = NULL;
849 list_for_each_entry(pos, &state->lock_states, ls_locks) {
850 if (pos->ls_owner == fl_owner) {
851 ret = pos;
852 break;
853 }
854 if (pos->ls_owner == fl_owner2)
855 ret = pos;
856 }
857 if (ret)
858 refcount_inc(&ret->ls_count);
859 return ret;
860}
861
862/*
863 * Return a compatible lock_state. If no initialized lock_state structure
864 * exists, return an uninitialized one.
865 *
866 */
867static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
868{
869 struct nfs4_lock_state *lsp;
870 struct nfs_server *server = state->owner->so_server;
871
872 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
873 if (lsp == NULL)
874 return NULL;
875 nfs4_init_seqid_counter(&lsp->ls_seqid);
876 refcount_set(&lsp->ls_count, 1);
877 lsp->ls_state = state;
878 lsp->ls_owner = fl_owner;
879 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
880 if (lsp->ls_seqid.owner_id < 0)
881 goto out_free;
882 INIT_LIST_HEAD(&lsp->ls_locks);
883 return lsp;
884out_free:
885 kfree(lsp);
886 return NULL;
887}
888
889void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
890{
891 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
892 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
893 kfree(lsp);
894}
895
896/*
897 * Return a compatible lock_state. If no initialized lock_state structure
898 * exists, return an uninitialized one.
899 *
900 */
901static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
902{
903 struct nfs4_lock_state *lsp, *new = NULL;
904
905 for(;;) {
906 spin_lock(&state->state_lock);
907 lsp = __nfs4_find_lock_state(state, owner, NULL);
908 if (lsp != NULL)
909 break;
910 if (new != NULL) {
911 list_add(&new->ls_locks, &state->lock_states);
912 set_bit(LK_STATE_IN_USE, &state->flags);
913 lsp = new;
914 new = NULL;
915 break;
916 }
917 spin_unlock(&state->state_lock);
918 new = nfs4_alloc_lock_state(state, owner);
919 if (new == NULL)
920 return NULL;
921 }
922 spin_unlock(&state->state_lock);
923 if (new != NULL)
924 nfs4_free_lock_state(state->owner->so_server, new);
925 return lsp;
926}
927
928/*
929 * Release reference to lock_state, and free it if we see that
930 * it is no longer in use
931 */
932void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
933{
934 struct nfs_server *server;
935 struct nfs4_state *state;
936
937 if (lsp == NULL)
938 return;
939 state = lsp->ls_state;
940 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
941 return;
942 list_del(&lsp->ls_locks);
943 if (list_empty(&state->lock_states))
944 clear_bit(LK_STATE_IN_USE, &state->flags);
945 spin_unlock(&state->state_lock);
946 server = state->owner->so_server;
947 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
948 struct nfs_client *clp = server->nfs_client;
949
950 clp->cl_mvops->free_lock_state(server, lsp);
951 } else
952 nfs4_free_lock_state(server, lsp);
953}
954
955static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
956{
957 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
958
959 dst->fl_u.nfs4_fl.owner = lsp;
960 refcount_inc(&lsp->ls_count);
961}
962
963static void nfs4_fl_release_lock(struct file_lock *fl)
964{
965 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
966}
967
968static const struct file_lock_operations nfs4_fl_lock_ops = {
969 .fl_copy_lock = nfs4_fl_copy_lock,
970 .fl_release_private = nfs4_fl_release_lock,
971};
972
973int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
974{
975 struct nfs4_lock_state *lsp;
976
977 if (fl->fl_ops != NULL)
978 return 0;
979 lsp = nfs4_get_lock_state(state, fl->fl_owner);
980 if (lsp == NULL)
981 return -ENOMEM;
982 fl->fl_u.nfs4_fl.owner = lsp;
983 fl->fl_ops = &nfs4_fl_lock_ops;
984 return 0;
985}
986
987static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
988 struct nfs4_state *state,
989 const struct nfs_lock_context *l_ctx)
990{
991 struct nfs4_lock_state *lsp;
992 fl_owner_t fl_owner, fl_flock_owner;
993 int ret = -ENOENT;
994
995 if (l_ctx == NULL)
996 goto out;
997
998 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
999 goto out;
1000
1001 fl_owner = l_ctx->lockowner;
1002 fl_flock_owner = l_ctx->open_context->flock_owner;
1003
1004 spin_lock(&state->state_lock);
1005 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
1006 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1007 ret = -EIO;
1008 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1009 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1010 ret = 0;
1011 }
1012 spin_unlock(&state->state_lock);
1013 nfs4_put_lock_state(lsp);
1014out:
1015 return ret;
1016}
1017
1018bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1019{
1020 bool ret;
1021 const nfs4_stateid *src;
1022 int seq;
1023
1024 do {
1025 ret = false;
1026 src = &zero_stateid;
1027 seq = read_seqbegin(&state->seqlock);
1028 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1029 src = &state->open_stateid;
1030 ret = true;
1031 }
1032 nfs4_stateid_copy(dst, src);
1033 } while (read_seqretry(&state->seqlock, seq));
1034 return ret;
1035}
1036
1037/*
1038 * Byte-range lock aware utility to initialize the stateid of read/write
1039 * requests.
1040 */
1041int nfs4_select_rw_stateid(struct nfs4_state *state,
1042 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1043 nfs4_stateid *dst, const struct cred **cred)
1044{
1045 int ret;
1046
1047 if (!nfs4_valid_open_stateid(state))
1048 return -EIO;
1049 if (cred != NULL)
1050 *cred = NULL;
1051 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1052 if (ret == -EIO)
1053 /* A lost lock - don't even consider delegations */
1054 goto out;
1055 /* returns true if delegation stateid found and copied */
1056 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1057 ret = 0;
1058 goto out;
1059 }
1060 if (ret != -ENOENT)
1061 /* nfs4_copy_delegation_stateid() didn't over-write
1062 * dst, so it still has the lock stateid which we now
1063 * choose to use.
1064 */
1065 goto out;
1066 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1067out:
1068 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1069 dst->seqid = 0;
1070 return ret;
1071}
1072
1073struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1074{
1075 struct nfs_seqid *new;
1076
1077 new = kmalloc(sizeof(*new), gfp_mask);
1078 if (new == NULL)
1079 return ERR_PTR(-ENOMEM);
1080 new->sequence = counter;
1081 INIT_LIST_HEAD(&new->list);
1082 new->task = NULL;
1083 return new;
1084}
1085
1086void nfs_release_seqid(struct nfs_seqid *seqid)
1087{
1088 struct nfs_seqid_counter *sequence;
1089
1090 if (seqid == NULL || list_empty(&seqid->list))
1091 return;
1092 sequence = seqid->sequence;
1093 spin_lock(&sequence->lock);
1094 list_del_init(&seqid->list);
1095 if (!list_empty(&sequence->list)) {
1096 struct nfs_seqid *next;
1097
1098 next = list_first_entry(&sequence->list,
1099 struct nfs_seqid, list);
1100 rpc_wake_up_queued_task(&sequence->wait, next->task);
1101 }
1102 spin_unlock(&sequence->lock);
1103}
1104
1105void nfs_free_seqid(struct nfs_seqid *seqid)
1106{
1107 nfs_release_seqid(seqid);
1108 kfree(seqid);
1109}
1110
1111/*
1112 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1113 * failed with a seqid incrementing error -
1114 * see comments nfs4.h:seqid_mutating_error()
1115 */
1116static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1117{
1118 switch (status) {
1119 case 0:
1120 break;
1121 case -NFS4ERR_BAD_SEQID:
1122 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1123 return;
1124 pr_warn_ratelimited("NFS: v4 server returned a bad"
1125 " sequence-id error on an"
1126 " unconfirmed sequence %p!\n",
1127 seqid->sequence);
1128 return;
1129 case -NFS4ERR_STALE_CLIENTID:
1130 case -NFS4ERR_STALE_STATEID:
1131 case -NFS4ERR_BAD_STATEID:
1132 case -NFS4ERR_BADXDR:
1133 case -NFS4ERR_RESOURCE:
1134 case -NFS4ERR_NOFILEHANDLE:
1135 case -NFS4ERR_MOVED:
1136 /* Non-seqid mutating errors */
1137 return;
1138 }
1139 /*
1140 * Note: no locking needed as we are guaranteed to be first
1141 * on the sequence list
1142 */
1143 seqid->sequence->counter++;
1144}
1145
1146void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1147{
1148 struct nfs4_state_owner *sp;
1149
1150 if (seqid == NULL)
1151 return;
1152
1153 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1154 if (status == -NFS4ERR_BAD_SEQID)
1155 nfs4_reset_state_owner(sp);
1156 if (!nfs4_has_session(sp->so_server->nfs_client))
1157 nfs_increment_seqid(status, seqid);
1158}
1159
1160/*
1161 * Increment the seqid if the LOCK/LOCKU succeeded, or
1162 * failed with a seqid incrementing error -
1163 * see comments nfs4.h:seqid_mutating_error()
1164 */
1165void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1166{
1167 if (seqid != NULL)
1168 nfs_increment_seqid(status, seqid);
1169}
1170
1171int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1172{
1173 struct nfs_seqid_counter *sequence;
1174 int status = 0;
1175
1176 if (seqid == NULL)
1177 goto out;
1178 sequence = seqid->sequence;
1179 spin_lock(&sequence->lock);
1180 seqid->task = task;
1181 if (list_empty(&seqid->list))
1182 list_add_tail(&seqid->list, &sequence->list);
1183 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1184 goto unlock;
1185 rpc_sleep_on(&sequence->wait, task, NULL);
1186 status = -EAGAIN;
1187unlock:
1188 spin_unlock(&sequence->lock);
1189out:
1190 return status;
1191}
1192
1193static int nfs4_run_state_manager(void *);
1194
1195static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1196{
1197 smp_mb__before_atomic();
1198 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1199 smp_mb__after_atomic();
1200 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1201 rpc_wake_up(&clp->cl_rpcwaitq);
1202}
1203
1204/*
1205 * Schedule the nfs_client asynchronous state management routine
1206 */
1207void nfs4_schedule_state_manager(struct nfs_client *clp)
1208{
1209 struct task_struct *task;
1210 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1211
1212 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1213 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1214 return;
1215 __module_get(THIS_MODULE);
1216 refcount_inc(&clp->cl_count);
1217
1218 /* The rcu_read_lock() is not strictly necessary, as the state
1219 * manager is the only thread that ever changes the rpc_xprt
1220 * after it's initialized. At this point, we're single threaded. */
1221 rcu_read_lock();
1222 snprintf(buf, sizeof(buf), "%s-manager",
1223 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1224 rcu_read_unlock();
1225 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1226 if (IS_ERR(task)) {
1227 printk(KERN_ERR "%s: kthread_run: %ld\n",
1228 __func__, PTR_ERR(task));
1229 nfs4_clear_state_manager_bit(clp);
1230 nfs_put_client(clp);
1231 module_put(THIS_MODULE);
1232 }
1233}
1234
1235/*
1236 * Schedule a lease recovery attempt
1237 */
1238void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1239{
1240 if (!clp)
1241 return;
1242 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1243 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1244 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1245 clp->cl_hostname);
1246 nfs4_schedule_state_manager(clp);
1247}
1248EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1249
1250/**
1251 * nfs4_schedule_migration_recovery - trigger migration recovery
1252 *
1253 * @server: FSID that is migrating
1254 *
1255 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1256 * value is returned.
1257 */
1258int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1259{
1260 struct nfs_client *clp = server->nfs_client;
1261
1262 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1263 pr_err("NFS: volatile file handles not supported (server %s)\n",
1264 clp->cl_hostname);
1265 return -NFS4ERR_IO;
1266 }
1267
1268 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1269 return -NFS4ERR_IO;
1270
1271 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1272 __func__,
1273 (unsigned long long)server->fsid.major,
1274 (unsigned long long)server->fsid.minor,
1275 clp->cl_hostname);
1276
1277 set_bit(NFS_MIG_IN_TRANSITION,
1278 &((struct nfs_server *)server)->mig_status);
1279 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1280
1281 nfs4_schedule_state_manager(clp);
1282 return 0;
1283}
1284EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1285
1286/**
1287 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1288 *
1289 * @clp: server to check for moved leases
1290 *
1291 */
1292void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1293{
1294 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1295 __func__, clp->cl_clientid, clp->cl_hostname);
1296
1297 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1298 nfs4_schedule_state_manager(clp);
1299}
1300EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1301
1302int nfs4_wait_clnt_recover(struct nfs_client *clp)
1303{
1304 int res;
1305
1306 might_sleep();
1307
1308 refcount_inc(&clp->cl_count);
1309 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1310 nfs_wait_bit_killable, TASK_KILLABLE);
1311 if (res)
1312 goto out;
1313 if (clp->cl_cons_state < 0)
1314 res = clp->cl_cons_state;
1315out:
1316 nfs_put_client(clp);
1317 return res;
1318}
1319
1320int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1321{
1322 unsigned int loop;
1323 int ret;
1324
1325 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1326 ret = nfs4_wait_clnt_recover(clp);
1327 if (ret != 0)
1328 break;
1329 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1330 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1331 break;
1332 nfs4_schedule_state_manager(clp);
1333 ret = -EIO;
1334 }
1335 return ret;
1336}
1337
1338/*
1339 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1340 * @clp: client to process
1341 *
1342 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1343 * resend of the SETCLIENTID and hence re-establish the
1344 * callback channel. Then return all existing delegations.
1345 */
1346static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1347{
1348 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1349 nfs_expire_all_delegations(clp);
1350 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1351 clp->cl_hostname);
1352}
1353
1354void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1355{
1356 nfs40_handle_cb_pathdown(clp);
1357 nfs4_schedule_state_manager(clp);
1358}
1359
1360static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1361{
1362
1363 if (!nfs4_valid_open_stateid(state))
1364 return 0;
1365 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1366 /* Don't recover state that expired before the reboot */
1367 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1368 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1369 return 0;
1370 }
1371 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1372 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1373 return 1;
1374}
1375
1376int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1377{
1378 if (!nfs4_valid_open_stateid(state))
1379 return 0;
1380 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1381 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1382 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1383 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1384 return 1;
1385}
1386
1387int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1388{
1389 struct nfs_client *clp = server->nfs_client;
1390
1391 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1392 return -EBADF;
1393 nfs_inode_find_delegation_state_and_recover(state->inode,
1394 &state->stateid);
1395 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1396 clp->cl_hostname);
1397 nfs4_schedule_state_manager(clp);
1398 return 0;
1399}
1400EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1401
1402static struct nfs4_lock_state *
1403nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1404 const nfs4_stateid *stateid)
1405{
1406 struct nfs4_lock_state *pos;
1407
1408 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1409 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1410 continue;
1411 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1412 return pos;
1413 }
1414 return NULL;
1415}
1416
1417static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1418 const nfs4_stateid *stateid)
1419{
1420 bool found = false;
1421
1422 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1423 spin_lock(&state->state_lock);
1424 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1425 found = true;
1426 spin_unlock(&state->state_lock);
1427 }
1428 return found;
1429}
1430
1431void nfs_inode_find_state_and_recover(struct inode *inode,
1432 const nfs4_stateid *stateid)
1433{
1434 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1435 struct nfs_inode *nfsi = NFS_I(inode);
1436 struct nfs_open_context *ctx;
1437 struct nfs4_state *state;
1438 bool found = false;
1439
1440 rcu_read_lock();
1441 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1442 state = ctx->state;
1443 if (state == NULL)
1444 continue;
1445 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1446 nfs4_state_mark_reclaim_nograce(clp, state)) {
1447 found = true;
1448 continue;
1449 }
1450 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1451 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1452 nfs4_state_mark_reclaim_nograce(clp, state)) {
1453 found = true;
1454 continue;
1455 }
1456 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1457 nfs4_state_mark_reclaim_nograce(clp, state))
1458 found = true;
1459 }
1460 rcu_read_unlock();
1461
1462 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1463 if (found)
1464 nfs4_schedule_state_manager(clp);
1465}
1466
1467static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1468{
1469 struct inode *inode = state->inode;
1470 struct nfs_inode *nfsi = NFS_I(inode);
1471 struct nfs_open_context *ctx;
1472
1473 rcu_read_lock();
1474 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1475 if (ctx->state != state)
1476 continue;
1477 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1478 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1479 "error = %d\n", ctx->dentry, err);
1480 }
1481 rcu_read_unlock();
1482}
1483
1484static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1485{
1486 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1487 nfs4_state_mark_open_context_bad(state, error);
1488}
1489
1490
1491static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1492{
1493 struct inode *inode = state->inode;
1494 struct nfs_inode *nfsi = NFS_I(inode);
1495 struct file_lock *fl;
1496 struct nfs4_lock_state *lsp;
1497 int status = 0;
1498 struct file_lock_context *flctx = inode->i_flctx;
1499 struct list_head *list;
1500
1501 if (flctx == NULL)
1502 return 0;
1503
1504 list = &flctx->flc_posix;
1505
1506 /* Guard against delegation returns and new lock/unlock calls */
1507 down_write(&nfsi->rwsem);
1508 spin_lock(&flctx->flc_lock);
1509restart:
1510 list_for_each_entry(fl, list, fl_list) {
1511 if (nfs_file_open_context(fl->fl_file)->state != state)
1512 continue;
1513 spin_unlock(&flctx->flc_lock);
1514 status = ops->recover_lock(state, fl);
1515 switch (status) {
1516 case 0:
1517 break;
1518 case -ETIMEDOUT:
1519 case -ESTALE:
1520 case -NFS4ERR_ADMIN_REVOKED:
1521 case -NFS4ERR_STALE_STATEID:
1522 case -NFS4ERR_BAD_STATEID:
1523 case -NFS4ERR_EXPIRED:
1524 case -NFS4ERR_NO_GRACE:
1525 case -NFS4ERR_STALE_CLIENTID:
1526 case -NFS4ERR_BADSESSION:
1527 case -NFS4ERR_BADSLOT:
1528 case -NFS4ERR_BAD_HIGH_SLOT:
1529 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1530 goto out;
1531 default:
1532 pr_err("NFS: %s: unhandled error %d\n",
1533 __func__, status);
1534 fallthrough;
1535 case -ENOMEM:
1536 case -NFS4ERR_DENIED:
1537 case -NFS4ERR_RECLAIM_BAD:
1538 case -NFS4ERR_RECLAIM_CONFLICT:
1539 lsp = fl->fl_u.nfs4_fl.owner;
1540 if (lsp)
1541 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1542 status = 0;
1543 }
1544 spin_lock(&flctx->flc_lock);
1545 }
1546 if (list == &flctx->flc_posix) {
1547 list = &flctx->flc_flock;
1548 goto restart;
1549 }
1550 spin_unlock(&flctx->flc_lock);
1551out:
1552 up_write(&nfsi->rwsem);
1553 return status;
1554}
1555
1556#ifdef CONFIG_NFS_V4_2
1557static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1558{
1559 struct nfs4_copy_state *copy;
1560
1561 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1562 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1563 return;
1564
1565 spin_lock(&sp->so_server->nfs_client->cl_lock);
1566 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1567 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1568 !nfs4_stateid_match_other(&state->stateid,
1569 ©->parent_dst_state->stateid)))
1570 continue;
1571 copy->flags = 1;
1572 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1573 &state->flags)) {
1574 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1575 complete(©->completion);
1576 }
1577 }
1578 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1579 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1580 !nfs4_stateid_match_other(&state->stateid,
1581 ©->parent_src_state->stateid)))
1582 continue;
1583 copy->flags = 1;
1584 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1585 &state->flags))
1586 complete(©->completion);
1587 }
1588 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1589}
1590#else /* !CONFIG_NFS_V4_2 */
1591static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1592 struct nfs4_state *state)
1593{
1594}
1595#endif /* CONFIG_NFS_V4_2 */
1596
1597static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1598 const struct nfs4_state_recovery_ops *ops)
1599{
1600 struct nfs4_lock_state *lock;
1601 int status;
1602
1603 status = ops->recover_open(sp, state);
1604 if (status < 0)
1605 return status;
1606
1607 status = nfs4_reclaim_locks(state, ops);
1608 if (status < 0)
1609 return status;
1610
1611 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1612 spin_lock(&state->state_lock);
1613 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1614 trace_nfs4_state_lock_reclaim(state, lock);
1615 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1616 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1617 }
1618 spin_unlock(&state->state_lock);
1619 }
1620
1621 nfs42_complete_copies(sp, state);
1622 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1623 return status;
1624}
1625
1626static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1627{
1628 struct nfs4_state *state;
1629 unsigned int loop = 0;
1630 int status = 0;
1631#ifdef CONFIG_NFS_V4_2
1632 bool found_ssc_copy_state = false;
1633#endif /* CONFIG_NFS_V4_2 */
1634
1635 /* Note: we rely on the sp->so_states list being ordered
1636 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1637 * states first.
1638 * This is needed to ensure that the server won't give us any
1639 * read delegations that we have to return if, say, we are
1640 * recovering after a network partition or a reboot from a
1641 * server that doesn't support a grace period.
1642 */
1643 spin_lock(&sp->so_lock);
1644 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1645restart:
1646 list_for_each_entry(state, &sp->so_states, open_states) {
1647 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1648 continue;
1649 if (!nfs4_valid_open_stateid(state))
1650 continue;
1651 if (state->state == 0)
1652 continue;
1653#ifdef CONFIG_NFS_V4_2
1654 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1655 nfs4_state_mark_recovery_failed(state, -EIO);
1656 found_ssc_copy_state = true;
1657 continue;
1658 }
1659#endif /* CONFIG_NFS_V4_2 */
1660 refcount_inc(&state->count);
1661 spin_unlock(&sp->so_lock);
1662 status = __nfs4_reclaim_open_state(sp, state, ops);
1663
1664 switch (status) {
1665 default:
1666 if (status >= 0) {
1667 loop = 0;
1668 break;
1669 }
1670 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1671 fallthrough;
1672 case -ENOENT:
1673 case -ENOMEM:
1674 case -EACCES:
1675 case -EROFS:
1676 case -EIO:
1677 case -ESTALE:
1678 /* Open state on this file cannot be recovered */
1679 nfs4_state_mark_recovery_failed(state, status);
1680 break;
1681 case -EAGAIN:
1682 ssleep(1);
1683 if (loop++ < 10) {
1684 set_bit(ops->state_flag_bit, &state->flags);
1685 break;
1686 }
1687 fallthrough;
1688 case -NFS4ERR_ADMIN_REVOKED:
1689 case -NFS4ERR_STALE_STATEID:
1690 case -NFS4ERR_OLD_STATEID:
1691 case -NFS4ERR_BAD_STATEID:
1692 case -NFS4ERR_RECLAIM_BAD:
1693 case -NFS4ERR_RECLAIM_CONFLICT:
1694 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1695 break;
1696 case -NFS4ERR_EXPIRED:
1697 case -NFS4ERR_NO_GRACE:
1698 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1699 fallthrough;
1700 case -NFS4ERR_STALE_CLIENTID:
1701 case -NFS4ERR_BADSESSION:
1702 case -NFS4ERR_BADSLOT:
1703 case -NFS4ERR_BAD_HIGH_SLOT:
1704 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1705 case -ETIMEDOUT:
1706 goto out_err;
1707 }
1708 nfs4_put_open_state(state);
1709 spin_lock(&sp->so_lock);
1710 goto restart;
1711 }
1712 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1713 spin_unlock(&sp->so_lock);
1714#ifdef CONFIG_NFS_V4_2
1715 if (found_ssc_copy_state)
1716 return -EIO;
1717#endif /* CONFIG_NFS_V4_2 */
1718 return 0;
1719out_err:
1720 nfs4_put_open_state(state);
1721 spin_lock(&sp->so_lock);
1722 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1723 spin_unlock(&sp->so_lock);
1724 return status;
1725}
1726
1727static void nfs4_clear_open_state(struct nfs4_state *state)
1728{
1729 struct nfs4_lock_state *lock;
1730
1731 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1732 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1733 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1734 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1735 spin_lock(&state->state_lock);
1736 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1737 lock->ls_seqid.flags = 0;
1738 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1739 }
1740 spin_unlock(&state->state_lock);
1741}
1742
1743static void nfs4_reset_seqids(struct nfs_server *server,
1744 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1745{
1746 struct nfs_client *clp = server->nfs_client;
1747 struct nfs4_state_owner *sp;
1748 struct rb_node *pos;
1749 struct nfs4_state *state;
1750
1751 spin_lock(&clp->cl_lock);
1752 for (pos = rb_first(&server->state_owners);
1753 pos != NULL;
1754 pos = rb_next(pos)) {
1755 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1756 sp->so_seqid.flags = 0;
1757 spin_lock(&sp->so_lock);
1758 list_for_each_entry(state, &sp->so_states, open_states) {
1759 if (mark_reclaim(clp, state))
1760 nfs4_clear_open_state(state);
1761 }
1762 spin_unlock(&sp->so_lock);
1763 }
1764 spin_unlock(&clp->cl_lock);
1765}
1766
1767static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1768 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1769{
1770 struct nfs_server *server;
1771
1772 rcu_read_lock();
1773 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1774 nfs4_reset_seqids(server, mark_reclaim);
1775 rcu_read_unlock();
1776}
1777
1778static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1779{
1780 /* Mark all delegations for reclaim */
1781 nfs_delegation_mark_reclaim(clp);
1782 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1783}
1784
1785static int nfs4_reclaim_complete(struct nfs_client *clp,
1786 const struct nfs4_state_recovery_ops *ops,
1787 const struct cred *cred)
1788{
1789 /* Notify the server we're done reclaiming our state */
1790 if (ops->reclaim_complete)
1791 return ops->reclaim_complete(clp, cred);
1792 return 0;
1793}
1794
1795static void nfs4_clear_reclaim_server(struct nfs_server *server)
1796{
1797 struct nfs_client *clp = server->nfs_client;
1798 struct nfs4_state_owner *sp;
1799 struct rb_node *pos;
1800 struct nfs4_state *state;
1801
1802 spin_lock(&clp->cl_lock);
1803 for (pos = rb_first(&server->state_owners);
1804 pos != NULL;
1805 pos = rb_next(pos)) {
1806 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1807 spin_lock(&sp->so_lock);
1808 list_for_each_entry(state, &sp->so_states, open_states) {
1809 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1810 &state->flags))
1811 continue;
1812 nfs4_state_mark_reclaim_nograce(clp, state);
1813 }
1814 spin_unlock(&sp->so_lock);
1815 }
1816 spin_unlock(&clp->cl_lock);
1817}
1818
1819static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1820{
1821 struct nfs_server *server;
1822
1823 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1824 return 0;
1825
1826 rcu_read_lock();
1827 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1828 nfs4_clear_reclaim_server(server);
1829 rcu_read_unlock();
1830
1831 nfs_delegation_reap_unclaimed(clp);
1832 return 1;
1833}
1834
1835static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1836{
1837 const struct nfs4_state_recovery_ops *ops;
1838 const struct cred *cred;
1839 int err;
1840
1841 if (!nfs4_state_clear_reclaim_reboot(clp))
1842 return;
1843 ops = clp->cl_mvops->reboot_recovery_ops;
1844 cred = nfs4_get_clid_cred(clp);
1845 err = nfs4_reclaim_complete(clp, ops, cred);
1846 put_cred(cred);
1847 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1848 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1849}
1850
1851static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1852{
1853 nfs_mark_test_expired_all_delegations(clp);
1854 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1855}
1856
1857static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1858{
1859 switch (error) {
1860 case 0:
1861 break;
1862 case -NFS4ERR_CB_PATH_DOWN:
1863 nfs40_handle_cb_pathdown(clp);
1864 break;
1865 case -NFS4ERR_NO_GRACE:
1866 nfs4_state_end_reclaim_reboot(clp);
1867 break;
1868 case -NFS4ERR_STALE_CLIENTID:
1869 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1870 nfs4_state_start_reclaim_reboot(clp);
1871 break;
1872 case -NFS4ERR_EXPIRED:
1873 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1874 nfs4_state_start_reclaim_nograce(clp);
1875 break;
1876 case -NFS4ERR_BADSESSION:
1877 case -NFS4ERR_BADSLOT:
1878 case -NFS4ERR_BAD_HIGH_SLOT:
1879 case -NFS4ERR_DEADSESSION:
1880 case -NFS4ERR_SEQ_FALSE_RETRY:
1881 case -NFS4ERR_SEQ_MISORDERED:
1882 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1883 /* Zero session reset errors */
1884 break;
1885 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1886 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1887 break;
1888 default:
1889 dprintk("%s: failed to handle error %d for server %s\n",
1890 __func__, error, clp->cl_hostname);
1891 return error;
1892 }
1893 dprintk("%s: handled error %d for server %s\n", __func__, error,
1894 clp->cl_hostname);
1895 return 0;
1896}
1897
1898static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1899{
1900 struct nfs4_state_owner *sp;
1901 struct nfs_server *server;
1902 struct rb_node *pos;
1903 LIST_HEAD(freeme);
1904 int status = 0;
1905
1906restart:
1907 rcu_read_lock();
1908 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1909 nfs4_purge_state_owners(server, &freeme);
1910 spin_lock(&clp->cl_lock);
1911 for (pos = rb_first(&server->state_owners);
1912 pos != NULL;
1913 pos = rb_next(pos)) {
1914 sp = rb_entry(pos,
1915 struct nfs4_state_owner, so_server_node);
1916 if (!test_and_clear_bit(ops->owner_flag_bit,
1917 &sp->so_flags))
1918 continue;
1919 if (!atomic_inc_not_zero(&sp->so_count))
1920 continue;
1921 spin_unlock(&clp->cl_lock);
1922 rcu_read_unlock();
1923
1924 status = nfs4_reclaim_open_state(sp, ops);
1925 if (status < 0) {
1926 set_bit(ops->owner_flag_bit, &sp->so_flags);
1927 nfs4_put_state_owner(sp);
1928 status = nfs4_recovery_handle_error(clp, status);
1929 return (status != 0) ? status : -EAGAIN;
1930 }
1931
1932 nfs4_put_state_owner(sp);
1933 goto restart;
1934 }
1935 spin_unlock(&clp->cl_lock);
1936 }
1937 rcu_read_unlock();
1938 nfs4_free_state_owners(&freeme);
1939 return 0;
1940}
1941
1942static int nfs4_check_lease(struct nfs_client *clp)
1943{
1944 const struct cred *cred;
1945 const struct nfs4_state_maintenance_ops *ops =
1946 clp->cl_mvops->state_renewal_ops;
1947 int status;
1948
1949 /* Is the client already known to have an expired lease? */
1950 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1951 return 0;
1952 cred = ops->get_state_renewal_cred(clp);
1953 if (cred == NULL) {
1954 cred = nfs4_get_clid_cred(clp);
1955 status = -ENOKEY;
1956 if (cred == NULL)
1957 goto out;
1958 }
1959 status = ops->renew_lease(clp, cred);
1960 put_cred(cred);
1961 if (status == -ETIMEDOUT) {
1962 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1963 return 0;
1964 }
1965out:
1966 return nfs4_recovery_handle_error(clp, status);
1967}
1968
1969/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1970 * and for recoverable errors on EXCHANGE_ID for v4.1
1971 */
1972static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1973{
1974 switch (status) {
1975 case -NFS4ERR_SEQ_MISORDERED:
1976 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1977 return -ESERVERFAULT;
1978 /* Lease confirmation error: retry after purging the lease */
1979 ssleep(1);
1980 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1981 break;
1982 case -NFS4ERR_STALE_CLIENTID:
1983 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1984 nfs4_state_start_reclaim_reboot(clp);
1985 break;
1986 case -NFS4ERR_CLID_INUSE:
1987 pr_err("NFS: Server %s reports our clientid is in use\n",
1988 clp->cl_hostname);
1989 nfs_mark_client_ready(clp, -EPERM);
1990 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1991 return -EPERM;
1992 case -EACCES:
1993 case -NFS4ERR_DELAY:
1994 case -EAGAIN:
1995 ssleep(1);
1996 break;
1997
1998 case -NFS4ERR_MINOR_VERS_MISMATCH:
1999 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2000 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2001 dprintk("%s: exit with error %d for server %s\n",
2002 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2003 return -EPROTONOSUPPORT;
2004 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2005 * in nfs4_exchange_id */
2006 default:
2007 dprintk("%s: exit with error %d for server %s\n", __func__,
2008 status, clp->cl_hostname);
2009 return status;
2010 }
2011 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2012 dprintk("%s: handled error %d for server %s\n", __func__, status,
2013 clp->cl_hostname);
2014 return 0;
2015}
2016
2017static int nfs4_establish_lease(struct nfs_client *clp)
2018{
2019 const struct cred *cred;
2020 const struct nfs4_state_recovery_ops *ops =
2021 clp->cl_mvops->reboot_recovery_ops;
2022 int status;
2023
2024 status = nfs4_begin_drain_session(clp);
2025 if (status != 0)
2026 return status;
2027 cred = nfs4_get_clid_cred(clp);
2028 if (cred == NULL)
2029 return -ENOENT;
2030 status = ops->establish_clid(clp, cred);
2031 put_cred(cred);
2032 if (status != 0)
2033 return status;
2034 pnfs_destroy_all_layouts(clp);
2035 return 0;
2036}
2037
2038/*
2039 * Returns zero or a negative errno. NFS4ERR values are converted
2040 * to local errno values.
2041 */
2042static int nfs4_reclaim_lease(struct nfs_client *clp)
2043{
2044 int status;
2045
2046 status = nfs4_establish_lease(clp);
2047 if (status < 0)
2048 return nfs4_handle_reclaim_lease_error(clp, status);
2049 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2050 nfs4_state_start_reclaim_nograce(clp);
2051 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2052 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2053 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2054 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2055 return 0;
2056}
2057
2058static int nfs4_purge_lease(struct nfs_client *clp)
2059{
2060 int status;
2061
2062 status = nfs4_establish_lease(clp);
2063 if (status < 0)
2064 return nfs4_handle_reclaim_lease_error(clp, status);
2065 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2066 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2067 nfs4_state_start_reclaim_nograce(clp);
2068 return 0;
2069}
2070
2071/*
2072 * Try remote migration of one FSID from a source server to a
2073 * destination server. The source server provides a list of
2074 * potential destinations.
2075 *
2076 * Returns zero or a negative NFS4ERR status code.
2077 */
2078static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2079{
2080 struct nfs_client *clp = server->nfs_client;
2081 struct nfs4_fs_locations *locations = NULL;
2082 struct inode *inode;
2083 struct page *page;
2084 int status, result;
2085
2086 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2087 (unsigned long long)server->fsid.major,
2088 (unsigned long long)server->fsid.minor,
2089 clp->cl_hostname);
2090
2091 result = 0;
2092 page = alloc_page(GFP_KERNEL);
2093 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2094 if (page == NULL || locations == NULL) {
2095 dprintk("<-- %s: no memory\n", __func__);
2096 goto out;
2097 }
2098
2099 inode = d_inode(server->super->s_root);
2100 result = nfs4_proc_get_locations(inode, locations, page, cred);
2101 if (result) {
2102 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2103 __func__, result);
2104 goto out;
2105 }
2106
2107 result = -NFS4ERR_NXIO;
2108 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2109 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2110 __func__);
2111 goto out;
2112 }
2113
2114 status = nfs4_begin_drain_session(clp);
2115 if (status != 0) {
2116 result = status;
2117 goto out;
2118 }
2119
2120 status = nfs4_replace_transport(server, locations);
2121 if (status != 0) {
2122 dprintk("<-- %s: failed to replace transport: %d\n",
2123 __func__, status);
2124 goto out;
2125 }
2126
2127 result = 0;
2128 dprintk("<-- %s: migration succeeded\n", __func__);
2129
2130out:
2131 if (page != NULL)
2132 __free_page(page);
2133 kfree(locations);
2134 if (result) {
2135 pr_err("NFS: migration recovery failed (server %s)\n",
2136 clp->cl_hostname);
2137 set_bit(NFS_MIG_FAILED, &server->mig_status);
2138 }
2139 return result;
2140}
2141
2142/*
2143 * Returns zero or a negative NFS4ERR status code.
2144 */
2145static int nfs4_handle_migration(struct nfs_client *clp)
2146{
2147 const struct nfs4_state_maintenance_ops *ops =
2148 clp->cl_mvops->state_renewal_ops;
2149 struct nfs_server *server;
2150 const struct cred *cred;
2151
2152 dprintk("%s: migration reported on \"%s\"\n", __func__,
2153 clp->cl_hostname);
2154
2155 cred = ops->get_state_renewal_cred(clp);
2156 if (cred == NULL)
2157 return -NFS4ERR_NOENT;
2158
2159 clp->cl_mig_gen++;
2160restart:
2161 rcu_read_lock();
2162 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2163 int status;
2164
2165 if (server->mig_gen == clp->cl_mig_gen)
2166 continue;
2167 server->mig_gen = clp->cl_mig_gen;
2168
2169 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2170 &server->mig_status))
2171 continue;
2172
2173 rcu_read_unlock();
2174 status = nfs4_try_migration(server, cred);
2175 if (status < 0) {
2176 put_cred(cred);
2177 return status;
2178 }
2179 goto restart;
2180 }
2181 rcu_read_unlock();
2182 put_cred(cred);
2183 return 0;
2184}
2185
2186/*
2187 * Test each nfs_server on the clp's cl_superblocks list to see
2188 * if it's moved to another server. Stop when the server no longer
2189 * returns NFS4ERR_LEASE_MOVED.
2190 */
2191static int nfs4_handle_lease_moved(struct nfs_client *clp)
2192{
2193 const struct nfs4_state_maintenance_ops *ops =
2194 clp->cl_mvops->state_renewal_ops;
2195 struct nfs_server *server;
2196 const struct cred *cred;
2197
2198 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2199 clp->cl_hostname);
2200
2201 cred = ops->get_state_renewal_cred(clp);
2202 if (cred == NULL)
2203 return -NFS4ERR_NOENT;
2204
2205 clp->cl_mig_gen++;
2206restart:
2207 rcu_read_lock();
2208 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2209 struct inode *inode;
2210 int status;
2211
2212 if (server->mig_gen == clp->cl_mig_gen)
2213 continue;
2214 server->mig_gen = clp->cl_mig_gen;
2215
2216 rcu_read_unlock();
2217
2218 inode = d_inode(server->super->s_root);
2219 status = nfs4_proc_fsid_present(inode, cred);
2220 if (status != -NFS4ERR_MOVED)
2221 goto restart; /* wasn't this one */
2222 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2223 goto restart; /* there are more */
2224 goto out;
2225 }
2226 rcu_read_unlock();
2227
2228out:
2229 put_cred(cred);
2230 return 0;
2231}
2232
2233/**
2234 * nfs4_discover_server_trunking - Detect server IP address trunking
2235 *
2236 * @clp: nfs_client under test
2237 * @result: OUT: found nfs_client, or clp
2238 *
2239 * Returns zero or a negative errno. If zero is returned,
2240 * an nfs_client pointer is planted in "result".
2241 *
2242 * Note: since we are invoked in process context, and
2243 * not from inside the state manager, we cannot use
2244 * nfs4_handle_reclaim_lease_error().
2245 */
2246int nfs4_discover_server_trunking(struct nfs_client *clp,
2247 struct nfs_client **result)
2248{
2249 const struct nfs4_state_recovery_ops *ops =
2250 clp->cl_mvops->reboot_recovery_ops;
2251 struct rpc_clnt *clnt;
2252 const struct cred *cred;
2253 int i, status;
2254
2255 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2256
2257 clnt = clp->cl_rpcclient;
2258 i = 0;
2259
2260 mutex_lock(&nfs_clid_init_mutex);
2261again:
2262 status = -ENOENT;
2263 cred = nfs4_get_clid_cred(clp);
2264 if (cred == NULL)
2265 goto out_unlock;
2266
2267 status = ops->detect_trunking(clp, result, cred);
2268 put_cred(cred);
2269 switch (status) {
2270 case 0:
2271 case -EINTR:
2272 case -ERESTARTSYS:
2273 break;
2274 case -ETIMEDOUT:
2275 if (clnt->cl_softrtry)
2276 break;
2277 fallthrough;
2278 case -NFS4ERR_DELAY:
2279 case -EAGAIN:
2280 ssleep(1);
2281 fallthrough;
2282 case -NFS4ERR_STALE_CLIENTID:
2283 dprintk("NFS: %s after status %d, retrying\n",
2284 __func__, status);
2285 goto again;
2286 case -EACCES:
2287 if (i++ == 0) {
2288 nfs4_root_machine_cred(clp);
2289 goto again;
2290 }
2291 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2292 break;
2293 fallthrough;
2294 case -NFS4ERR_CLID_INUSE:
2295 case -NFS4ERR_WRONGSEC:
2296 /* No point in retrying if we already used RPC_AUTH_UNIX */
2297 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2298 status = -EPERM;
2299 break;
2300 }
2301 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2302 if (IS_ERR(clnt)) {
2303 status = PTR_ERR(clnt);
2304 break;
2305 }
2306 /* Note: this is safe because we haven't yet marked the
2307 * client as ready, so we are the only user of
2308 * clp->cl_rpcclient
2309 */
2310 clnt = xchg(&clp->cl_rpcclient, clnt);
2311 rpc_shutdown_client(clnt);
2312 clnt = clp->cl_rpcclient;
2313 goto again;
2314
2315 case -NFS4ERR_MINOR_VERS_MISMATCH:
2316 status = -EPROTONOSUPPORT;
2317 break;
2318
2319 case -EKEYEXPIRED:
2320 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2321 * in nfs4_exchange_id */
2322 status = -EKEYEXPIRED;
2323 break;
2324 default:
2325 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2326 __func__, status);
2327 status = -EIO;
2328 }
2329
2330out_unlock:
2331 mutex_unlock(&nfs_clid_init_mutex);
2332 dprintk("NFS: %s: status = %d\n", __func__, status);
2333 return status;
2334}
2335
2336#ifdef CONFIG_NFS_V4_1
2337void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2338{
2339 struct nfs_client *clp = session->clp;
2340
2341 switch (err) {
2342 default:
2343 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2344 break;
2345 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2346 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2347 }
2348 nfs4_schedule_state_manager(clp);
2349}
2350EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2351
2352void nfs41_notify_server(struct nfs_client *clp)
2353{
2354 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2355 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2356 nfs4_schedule_state_manager(clp);
2357}
2358
2359static void nfs4_reset_all_state(struct nfs_client *clp)
2360{
2361 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2362 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2363 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2364 nfs4_state_start_reclaim_nograce(clp);
2365 dprintk("%s: scheduling reset of all state for server %s!\n",
2366 __func__, clp->cl_hostname);
2367 nfs4_schedule_state_manager(clp);
2368 }
2369}
2370
2371static void nfs41_handle_server_reboot(struct nfs_client *clp)
2372{
2373 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2374 nfs4_state_start_reclaim_reboot(clp);
2375 dprintk("%s: server %s rebooted!\n", __func__,
2376 clp->cl_hostname);
2377 nfs4_schedule_state_manager(clp);
2378 }
2379}
2380
2381static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2382{
2383 nfs4_reset_all_state(clp);
2384 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2385}
2386
2387static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2388{
2389 nfs4_state_start_reclaim_nograce(clp);
2390 nfs4_schedule_state_manager(clp);
2391
2392 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2393}
2394
2395static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2396{
2397 /* FIXME: For now, we destroy all layouts. */
2398 pnfs_destroy_all_layouts(clp);
2399 nfs_test_expired_all_delegations(clp);
2400 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2401 clp->cl_hostname);
2402}
2403
2404static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2405{
2406 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2407 nfs4_schedule_state_manager(clp);
2408
2409 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2410 clp->cl_hostname);
2411}
2412
2413static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2414{
2415 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2416 &clp->cl_state) == 0)
2417 nfs4_schedule_state_manager(clp);
2418}
2419
2420void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2421 bool recovery)
2422{
2423 if (!flags)
2424 return;
2425
2426 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2427 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2428 /*
2429 * If we're called from the state manager thread, then assume we're
2430 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2431 * Those flags are expected to remain set until we're done
2432 * recovering (see RFC5661, section 18.46.3).
2433 */
2434 if (recovery)
2435 goto out_recovery;
2436
2437 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2438 nfs41_handle_server_reboot(clp);
2439 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2440 nfs41_handle_all_state_revoked(clp);
2441 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2442 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2443 nfs41_handle_some_state_revoked(clp);
2444 if (flags & SEQ4_STATUS_LEASE_MOVED)
2445 nfs4_schedule_lease_moved_recovery(clp);
2446 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2447 nfs41_handle_recallable_state_revoked(clp);
2448out_recovery:
2449 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2450 nfs41_handle_backchannel_fault(clp);
2451 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2452 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2453 nfs41_handle_cb_path_down(clp);
2454}
2455
2456static int nfs4_reset_session(struct nfs_client *clp)
2457{
2458 const struct cred *cred;
2459 int status;
2460
2461 if (!nfs4_has_session(clp))
2462 return 0;
2463 status = nfs4_begin_drain_session(clp);
2464 if (status != 0)
2465 return status;
2466 cred = nfs4_get_clid_cred(clp);
2467 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2468 switch (status) {
2469 case 0:
2470 case -NFS4ERR_BADSESSION:
2471 case -NFS4ERR_DEADSESSION:
2472 break;
2473 case -NFS4ERR_BACK_CHAN_BUSY:
2474 case -NFS4ERR_DELAY:
2475 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2476 status = 0;
2477 ssleep(1);
2478 goto out;
2479 default:
2480 status = nfs4_recovery_handle_error(clp, status);
2481 goto out;
2482 }
2483
2484 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2485 status = nfs4_proc_create_session(clp, cred);
2486 if (status) {
2487 dprintk("%s: session reset failed with status %d for server %s!\n",
2488 __func__, status, clp->cl_hostname);
2489 status = nfs4_handle_reclaim_lease_error(clp, status);
2490 goto out;
2491 }
2492 nfs41_finish_session_reset(clp);
2493 dprintk("%s: session reset was successful for server %s!\n",
2494 __func__, clp->cl_hostname);
2495out:
2496 put_cred(cred);
2497 return status;
2498}
2499
2500static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2501{
2502 const struct cred *cred;
2503 int ret;
2504
2505 if (!nfs4_has_session(clp))
2506 return 0;
2507 ret = nfs4_begin_drain_session(clp);
2508 if (ret != 0)
2509 return ret;
2510 cred = nfs4_get_clid_cred(clp);
2511 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2512 put_cred(cred);
2513 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2514 switch (ret) {
2515 case 0:
2516 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2517 __func__, clp->cl_hostname);
2518 break;
2519 case -NFS4ERR_DELAY:
2520 ssleep(1);
2521 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2522 break;
2523 default:
2524 return nfs4_recovery_handle_error(clp, ret);
2525 }
2526 return 0;
2527}
2528
2529static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2530{
2531 int iomode = 0;
2532
2533 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2534 iomode += IOMODE_READ;
2535 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2536 iomode += IOMODE_RW;
2537 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2538 if (iomode) {
2539 pnfs_layout_return_unused_byclid(clp, iomode);
2540 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2541 }
2542}
2543#else /* CONFIG_NFS_V4_1 */
2544static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2545
2546static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2547{
2548 return 0;
2549}
2550
2551static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2552{
2553}
2554#endif /* CONFIG_NFS_V4_1 */
2555
2556static void nfs4_state_manager(struct nfs_client *clp)
2557{
2558 int status = 0;
2559 const char *section = "", *section_sep = "";
2560
2561 /* Ensure exclusive access to NFSv4 state */
2562 do {
2563 trace_nfs4_state_mgr(clp);
2564 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2565 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2566 section = "purge state";
2567 status = nfs4_purge_lease(clp);
2568 if (status < 0)
2569 goto out_error;
2570 continue;
2571 }
2572
2573 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2574 section = "lease expired";
2575 /* We're going to have to re-establish a clientid */
2576 status = nfs4_reclaim_lease(clp);
2577 if (status < 0)
2578 goto out_error;
2579 continue;
2580 }
2581
2582 /* Initialize or reset the session */
2583 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2584 section = "reset session";
2585 status = nfs4_reset_session(clp);
2586 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2587 continue;
2588 if (status < 0)
2589 goto out_error;
2590 }
2591
2592 /* Send BIND_CONN_TO_SESSION */
2593 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2594 &clp->cl_state)) {
2595 section = "bind conn to session";
2596 status = nfs4_bind_conn_to_session(clp);
2597 if (status < 0)
2598 goto out_error;
2599 continue;
2600 }
2601
2602 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2603 section = "check lease";
2604 status = nfs4_check_lease(clp);
2605 if (status < 0)
2606 goto out_error;
2607 continue;
2608 }
2609
2610 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2611 section = "migration";
2612 status = nfs4_handle_migration(clp);
2613 if (status < 0)
2614 goto out_error;
2615 }
2616
2617 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2618 section = "lease moved";
2619 status = nfs4_handle_lease_moved(clp);
2620 if (status < 0)
2621 goto out_error;
2622 }
2623
2624 /* First recover reboot state... */
2625 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2626 section = "reclaim reboot";
2627 status = nfs4_do_reclaim(clp,
2628 clp->cl_mvops->reboot_recovery_ops);
2629 if (status == -EAGAIN)
2630 continue;
2631 if (status < 0)
2632 goto out_error;
2633 nfs4_state_end_reclaim_reboot(clp);
2634 }
2635
2636 /* Detect expired delegations... */
2637 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2638 section = "detect expired delegations";
2639 nfs_reap_expired_delegations(clp);
2640 continue;
2641 }
2642
2643 /* Now recover expired state... */
2644 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2645 section = "reclaim nograce";
2646 status = nfs4_do_reclaim(clp,
2647 clp->cl_mvops->nograce_recovery_ops);
2648 if (status == -EAGAIN)
2649 continue;
2650 if (status < 0)
2651 goto out_error;
2652 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2653 }
2654
2655 nfs4_end_drain_session(clp);
2656 nfs4_clear_state_manager_bit(clp);
2657
2658 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2659 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2660 nfs_client_return_marked_delegations(clp);
2661 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2662 }
2663 nfs4_layoutreturn_any_run(clp);
2664 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2665 }
2666
2667 /* Did we race with an attempt to give us more work? */
2668 if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2669 return;
2670 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2671 return;
2672 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2673 goto out_drain;
2674
2675out_error:
2676 if (strlen(section))
2677 section_sep = ": ";
2678 trace_nfs4_state_mgr_failed(clp, section, status);
2679 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2680 " with error %d\n", section_sep, section,
2681 clp->cl_hostname, -status);
2682 ssleep(1);
2683out_drain:
2684 nfs4_end_drain_session(clp);
2685 nfs4_clear_state_manager_bit(clp);
2686}
2687
2688static int nfs4_run_state_manager(void *ptr)
2689{
2690 struct nfs_client *clp = ptr;
2691
2692 allow_signal(SIGKILL);
2693 nfs4_state_manager(clp);
2694 nfs_put_client(clp);
2695 module_put_and_exit(0);
2696 return 0;
2697}
1/*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR 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 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
41#include <linux/kernel.h>
42#include <linux/slab.h>
43#include <linux/fs.h>
44#include <linux/nfs_fs.h>
45#include <linux/kthread.h>
46#include <linux/module.h>
47#include <linux/random.h>
48#include <linux/ratelimit.h>
49#include <linux/workqueue.h>
50#include <linux/bitops.h>
51#include <linux/jiffies.h>
52
53#include <linux/sunrpc/clnt.h>
54
55#include "nfs4_fs.h"
56#include "callback.h"
57#include "delegation.h"
58#include "internal.h"
59#include "nfs4idmap.h"
60#include "nfs4session.h"
61#include "pnfs.h"
62#include "netns.h"
63
64#define NFSDBG_FACILITY NFSDBG_STATE
65
66#define OPENOWNER_POOL_SIZE 8
67
68const nfs4_stateid zero_stateid;
69static DEFINE_MUTEX(nfs_clid_init_mutex);
70
71int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
72{
73 struct nfs4_setclientid_res clid = {
74 .clientid = clp->cl_clientid,
75 .confirm = clp->cl_confirm,
76 };
77 unsigned short port;
78 int status;
79 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
80
81 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
82 goto do_confirm;
83 port = nn->nfs_callback_tcpport;
84 if (clp->cl_addr.ss_family == AF_INET6)
85 port = nn->nfs_callback_tcpport6;
86
87 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
88 if (status != 0)
89 goto out;
90 clp->cl_clientid = clid.clientid;
91 clp->cl_confirm = clid.confirm;
92 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
93do_confirm:
94 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
95 if (status != 0)
96 goto out;
97 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 nfs4_schedule_state_renewal(clp);
99out:
100 return status;
101}
102
103/**
104 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
105 *
106 * @clp: nfs_client under test
107 * @result: OUT: found nfs_client, or clp
108 * @cred: credential to use for trunking test
109 *
110 * Returns zero, a negative errno, or a negative NFS4ERR status.
111 * If zero is returned, an nfs_client pointer is planted in
112 * "result".
113 *
114 * Note: The returned client may not yet be marked ready.
115 */
116int nfs40_discover_server_trunking(struct nfs_client *clp,
117 struct nfs_client **result,
118 struct rpc_cred *cred)
119{
120 struct nfs4_setclientid_res clid = {
121 .clientid = clp->cl_clientid,
122 .confirm = clp->cl_confirm,
123 };
124 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
125 unsigned short port;
126 int status;
127
128 port = nn->nfs_callback_tcpport;
129 if (clp->cl_addr.ss_family == AF_INET6)
130 port = nn->nfs_callback_tcpport6;
131
132 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
133 if (status != 0)
134 goto out;
135 clp->cl_clientid = clid.clientid;
136 clp->cl_confirm = clid.confirm;
137
138 status = nfs40_walk_client_list(clp, result, cred);
139 if (status == 0) {
140 /* Sustain the lease, even if it's empty. If the clientid4
141 * goes stale it's of no use for trunking discovery. */
142 nfs4_schedule_state_renewal(*result);
143 }
144out:
145 return status;
146}
147
148struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
149{
150 struct rpc_cred *cred = NULL;
151
152 if (clp->cl_machine_cred != NULL)
153 cred = get_rpccred(clp->cl_machine_cred);
154 return cred;
155}
156
157static void nfs4_root_machine_cred(struct nfs_client *clp)
158{
159 struct rpc_cred *cred, *new;
160
161 new = rpc_lookup_machine_cred(NULL);
162 spin_lock(&clp->cl_lock);
163 cred = clp->cl_machine_cred;
164 clp->cl_machine_cred = new;
165 spin_unlock(&clp->cl_lock);
166 if (cred != NULL)
167 put_rpccred(cred);
168}
169
170static struct rpc_cred *
171nfs4_get_renew_cred_server_locked(struct nfs_server *server)
172{
173 struct rpc_cred *cred = NULL;
174 struct nfs4_state_owner *sp;
175 struct rb_node *pos;
176
177 for (pos = rb_first(&server->state_owners);
178 pos != NULL;
179 pos = rb_next(pos)) {
180 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
181 if (list_empty(&sp->so_states))
182 continue;
183 cred = get_rpccred(sp->so_cred);
184 break;
185 }
186 return cred;
187}
188
189/**
190 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
191 * @clp: client state handle
192 *
193 * Returns an rpc_cred with reference count bumped, or NULL.
194 * Caller must hold clp->cl_lock.
195 */
196struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
197{
198 struct rpc_cred *cred = NULL;
199 struct nfs_server *server;
200
201 /* Use machine credentials if available */
202 cred = nfs4_get_machine_cred_locked(clp);
203 if (cred != NULL)
204 goto out;
205
206 rcu_read_lock();
207 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
208 cred = nfs4_get_renew_cred_server_locked(server);
209 if (cred != NULL)
210 break;
211 }
212 rcu_read_unlock();
213
214out:
215 return cred;
216}
217
218static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
219{
220 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
221 spin_lock(&tbl->slot_tbl_lock);
222 nfs41_wake_slot_table(tbl);
223 spin_unlock(&tbl->slot_tbl_lock);
224 }
225}
226
227static void nfs4_end_drain_session(struct nfs_client *clp)
228{
229 struct nfs4_session *ses = clp->cl_session;
230
231 if (clp->cl_slot_tbl) {
232 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
233 return;
234 }
235
236 if (ses != NULL) {
237 nfs4_end_drain_slot_table(&ses->bc_slot_table);
238 nfs4_end_drain_slot_table(&ses->fc_slot_table);
239 }
240}
241
242static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
243{
244 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
245 spin_lock(&tbl->slot_tbl_lock);
246 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
247 reinit_completion(&tbl->complete);
248 spin_unlock(&tbl->slot_tbl_lock);
249 return wait_for_completion_interruptible(&tbl->complete);
250 }
251 spin_unlock(&tbl->slot_tbl_lock);
252 return 0;
253}
254
255static int nfs4_begin_drain_session(struct nfs_client *clp)
256{
257 struct nfs4_session *ses = clp->cl_session;
258 int ret = 0;
259
260 if (clp->cl_slot_tbl)
261 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
262
263 /* back channel */
264 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
265 if (ret)
266 return ret;
267 /* fore channel */
268 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
269}
270
271#if defined(CONFIG_NFS_V4_1)
272
273static int nfs41_setup_state_renewal(struct nfs_client *clp)
274{
275 int status;
276 struct nfs_fsinfo fsinfo;
277
278 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
279 nfs4_schedule_state_renewal(clp);
280 return 0;
281 }
282
283 status = nfs4_proc_get_lease_time(clp, &fsinfo);
284 if (status == 0) {
285 /* Update lease time and schedule renewal */
286 spin_lock(&clp->cl_lock);
287 clp->cl_lease_time = fsinfo.lease_time * HZ;
288 clp->cl_last_renewal = jiffies;
289 spin_unlock(&clp->cl_lock);
290
291 nfs4_schedule_state_renewal(clp);
292 }
293
294 return status;
295}
296
297static void nfs41_finish_session_reset(struct nfs_client *clp)
298{
299 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
300 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
301 /* create_session negotiated new slot table */
302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
303 nfs41_setup_state_renewal(clp);
304}
305
306int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
307{
308 int status;
309
310 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
311 goto do_confirm;
312 status = nfs4_proc_exchange_id(clp, cred);
313 if (status != 0)
314 goto out;
315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
316do_confirm:
317 status = nfs4_proc_create_session(clp, cred);
318 if (status != 0)
319 goto out;
320 nfs41_finish_session_reset(clp);
321 nfs_mark_client_ready(clp, NFS_CS_READY);
322out:
323 return status;
324}
325
326/**
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
328 *
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
332 *
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
335 * "result".
336 *
337 * Note: The returned client may not yet be marked ready.
338 */
339int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
342{
343 int status;
344
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
347 return status;
348
349 status = nfs41_walk_client_list(clp, result, cred);
350 if (status < 0)
351 return status;
352 if (clp != *result)
353 return 0;
354
355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
358 else
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
362 if (status < 0)
363 nfs_put_client(clp);
364 return status;
365}
366
367#endif /* CONFIG_NFS_V4_1 */
368
369/**
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
372 *
373 * Returns an rpc_cred with reference count bumped, or NULL.
374 */
375struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
376{
377 struct rpc_cred *cred;
378
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
382 return cred;
383}
384
385static struct nfs4_state_owner *
386nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
387{
388 struct rb_node **p = &server->state_owners.rb_node,
389 *parent = NULL;
390 struct nfs4_state_owner *sp;
391
392 while (*p != NULL) {
393 parent = *p;
394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
395
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
400 else {
401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
403 atomic_inc(&sp->so_count);
404 return sp;
405 }
406 }
407 return NULL;
408}
409
410static struct nfs4_state_owner *
411nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
412{
413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
415 *parent = NULL;
416 struct nfs4_state_owner *sp;
417 int err;
418
419 while (*p != NULL) {
420 parent = *p;
421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
422
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
427 else {
428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
430 atomic_inc(&sp->so_count);
431 return sp;
432 }
433 }
434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
435 if (err)
436 return ERR_PTR(err);
437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
439 return new;
440}
441
442static void
443nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
444{
445 struct nfs_server *server = sp->so_server;
446
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
450}
451
452static void
453nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
454{
455 sc->create_time = ktime_get();
456 sc->flags = 0;
457 sc->counter = 0;
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
461}
462
463static void
464nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
465{
466 rpc_destroy_wait_queue(&sc->wait);
467}
468
469/*
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
472 *
473 */
474static struct nfs4_state_owner *
475nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
477 gfp_t gfp_flags)
478{
479 struct nfs4_state_owner *sp;
480
481 sp = kzalloc(sizeof(*sp), gfp_flags);
482 if (!sp)
483 return NULL;
484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
486 spin_lock_init(&sp->so_lock);
487 INIT_LIST_HEAD(&sp->so_states);
488 nfs4_init_seqid_counter(&sp->so_seqid);
489 atomic_set(&sp->so_count, 1);
490 INIT_LIST_HEAD(&sp->so_lru);
491 seqcount_init(&sp->so_reclaim_seqcount);
492 mutex_init(&sp->so_delegreturn_mutex);
493 return sp;
494}
495
496static void
497nfs4_drop_state_owner(struct nfs4_state_owner *sp)
498{
499 struct rb_node *rb_node = &sp->so_server_node;
500
501 if (!RB_EMPTY_NODE(rb_node)) {
502 struct nfs_server *server = sp->so_server;
503 struct nfs_client *clp = server->nfs_client;
504
505 spin_lock(&clp->cl_lock);
506 if (!RB_EMPTY_NODE(rb_node)) {
507 rb_erase(rb_node, &server->state_owners);
508 RB_CLEAR_NODE(rb_node);
509 }
510 spin_unlock(&clp->cl_lock);
511 }
512}
513
514static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
515{
516 nfs4_destroy_seqid_counter(&sp->so_seqid);
517 put_rpccred(sp->so_cred);
518 kfree(sp);
519}
520
521static void nfs4_gc_state_owners(struct nfs_server *server)
522{
523 struct nfs_client *clp = server->nfs_client;
524 struct nfs4_state_owner *sp, *tmp;
525 unsigned long time_min, time_max;
526 LIST_HEAD(doomed);
527
528 spin_lock(&clp->cl_lock);
529 time_max = jiffies;
530 time_min = (long)time_max - (long)clp->cl_lease_time;
531 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
532 /* NB: LRU is sorted so that oldest is at the head */
533 if (time_in_range(sp->so_expires, time_min, time_max))
534 break;
535 list_move(&sp->so_lru, &doomed);
536 nfs4_remove_state_owner_locked(sp);
537 }
538 spin_unlock(&clp->cl_lock);
539
540 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
541 list_del(&sp->so_lru);
542 nfs4_free_state_owner(sp);
543 }
544}
545
546/**
547 * nfs4_get_state_owner - Look up a state owner given a credential
548 * @server: nfs_server to search
549 * @cred: RPC credential to match
550 *
551 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
552 */
553struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
554 struct rpc_cred *cred,
555 gfp_t gfp_flags)
556{
557 struct nfs_client *clp = server->nfs_client;
558 struct nfs4_state_owner *sp, *new;
559
560 spin_lock(&clp->cl_lock);
561 sp = nfs4_find_state_owner_locked(server, cred);
562 spin_unlock(&clp->cl_lock);
563 if (sp != NULL)
564 goto out;
565 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
566 if (new == NULL)
567 goto out;
568 do {
569 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
570 break;
571 spin_lock(&clp->cl_lock);
572 sp = nfs4_insert_state_owner_locked(new);
573 spin_unlock(&clp->cl_lock);
574 } while (sp == ERR_PTR(-EAGAIN));
575 if (sp != new)
576 nfs4_free_state_owner(new);
577out:
578 nfs4_gc_state_owners(server);
579 return sp;
580}
581
582/**
583 * nfs4_put_state_owner - Release a nfs4_state_owner
584 * @sp: state owner data to release
585 *
586 * Note that we keep released state owners on an LRU
587 * list.
588 * This caches valid state owners so that they can be
589 * reused, to avoid the OPEN_CONFIRM on minor version 0.
590 * It also pins the uniquifier of dropped state owners for
591 * a while, to ensure that those state owner names are
592 * never reused.
593 */
594void nfs4_put_state_owner(struct nfs4_state_owner *sp)
595{
596 struct nfs_server *server = sp->so_server;
597 struct nfs_client *clp = server->nfs_client;
598
599 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
600 return;
601
602 sp->so_expires = jiffies;
603 list_add_tail(&sp->so_lru, &server->state_owners_lru);
604 spin_unlock(&clp->cl_lock);
605}
606
607/**
608 * nfs4_purge_state_owners - Release all cached state owners
609 * @server: nfs_server with cached state owners to release
610 *
611 * Called at umount time. Remaining state owners will be on
612 * the LRU with ref count of zero.
613 */
614void nfs4_purge_state_owners(struct nfs_server *server)
615{
616 struct nfs_client *clp = server->nfs_client;
617 struct nfs4_state_owner *sp, *tmp;
618 LIST_HEAD(doomed);
619
620 spin_lock(&clp->cl_lock);
621 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
622 list_move(&sp->so_lru, &doomed);
623 nfs4_remove_state_owner_locked(sp);
624 }
625 spin_unlock(&clp->cl_lock);
626
627 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
628 list_del(&sp->so_lru);
629 nfs4_free_state_owner(sp);
630 }
631}
632
633static struct nfs4_state *
634nfs4_alloc_open_state(void)
635{
636 struct nfs4_state *state;
637
638 state = kzalloc(sizeof(*state), GFP_NOFS);
639 if (!state)
640 return NULL;
641 atomic_set(&state->count, 1);
642 INIT_LIST_HEAD(&state->lock_states);
643 spin_lock_init(&state->state_lock);
644 seqlock_init(&state->seqlock);
645 return state;
646}
647
648void
649nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
650{
651 if (state->state == fmode)
652 return;
653 /* NB! List reordering - see the reclaim code for why. */
654 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
655 if (fmode & FMODE_WRITE)
656 list_move(&state->open_states, &state->owner->so_states);
657 else
658 list_move_tail(&state->open_states, &state->owner->so_states);
659 }
660 state->state = fmode;
661}
662
663static struct nfs4_state *
664__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
665{
666 struct nfs_inode *nfsi = NFS_I(inode);
667 struct nfs4_state *state;
668
669 list_for_each_entry(state, &nfsi->open_states, inode_states) {
670 if (state->owner != owner)
671 continue;
672 if (!nfs4_valid_open_stateid(state))
673 continue;
674 if (atomic_inc_not_zero(&state->count))
675 return state;
676 }
677 return NULL;
678}
679
680static void
681nfs4_free_open_state(struct nfs4_state *state)
682{
683 kfree(state);
684}
685
686struct nfs4_state *
687nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
688{
689 struct nfs4_state *state, *new;
690 struct nfs_inode *nfsi = NFS_I(inode);
691
692 spin_lock(&inode->i_lock);
693 state = __nfs4_find_state_byowner(inode, owner);
694 spin_unlock(&inode->i_lock);
695 if (state)
696 goto out;
697 new = nfs4_alloc_open_state();
698 spin_lock(&owner->so_lock);
699 spin_lock(&inode->i_lock);
700 state = __nfs4_find_state_byowner(inode, owner);
701 if (state == NULL && new != NULL) {
702 state = new;
703 state->owner = owner;
704 atomic_inc(&owner->so_count);
705 list_add(&state->inode_states, &nfsi->open_states);
706 ihold(inode);
707 state->inode = inode;
708 spin_unlock(&inode->i_lock);
709 /* Note: The reclaim code dictates that we add stateless
710 * and read-only stateids to the end of the list */
711 list_add_tail(&state->open_states, &owner->so_states);
712 spin_unlock(&owner->so_lock);
713 } else {
714 spin_unlock(&inode->i_lock);
715 spin_unlock(&owner->so_lock);
716 if (new)
717 nfs4_free_open_state(new);
718 }
719out:
720 return state;
721}
722
723void nfs4_put_open_state(struct nfs4_state *state)
724{
725 struct inode *inode = state->inode;
726 struct nfs4_state_owner *owner = state->owner;
727
728 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
729 return;
730 spin_lock(&inode->i_lock);
731 list_del(&state->inode_states);
732 list_del(&state->open_states);
733 spin_unlock(&inode->i_lock);
734 spin_unlock(&owner->so_lock);
735 iput(inode);
736 nfs4_free_open_state(state);
737 nfs4_put_state_owner(owner);
738}
739
740/*
741 * Close the current file.
742 */
743static void __nfs4_close(struct nfs4_state *state,
744 fmode_t fmode, gfp_t gfp_mask, int wait)
745{
746 struct nfs4_state_owner *owner = state->owner;
747 int call_close = 0;
748 fmode_t newstate;
749
750 atomic_inc(&owner->so_count);
751 /* Protect against nfs4_find_state() */
752 spin_lock(&owner->so_lock);
753 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
754 case FMODE_READ:
755 state->n_rdonly--;
756 break;
757 case FMODE_WRITE:
758 state->n_wronly--;
759 break;
760 case FMODE_READ|FMODE_WRITE:
761 state->n_rdwr--;
762 }
763 newstate = FMODE_READ|FMODE_WRITE;
764 if (state->n_rdwr == 0) {
765 if (state->n_rdonly == 0) {
766 newstate &= ~FMODE_READ;
767 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
768 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
769 }
770 if (state->n_wronly == 0) {
771 newstate &= ~FMODE_WRITE;
772 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
773 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
774 }
775 if (newstate == 0)
776 clear_bit(NFS_DELEGATED_STATE, &state->flags);
777 }
778 nfs4_state_set_mode_locked(state, newstate);
779 spin_unlock(&owner->so_lock);
780
781 if (!call_close) {
782 nfs4_put_open_state(state);
783 nfs4_put_state_owner(owner);
784 } else
785 nfs4_do_close(state, gfp_mask, wait);
786}
787
788void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
789{
790 __nfs4_close(state, fmode, GFP_NOFS, 0);
791}
792
793void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
794{
795 __nfs4_close(state, fmode, GFP_KERNEL, 1);
796}
797
798/*
799 * Search the state->lock_states for an existing lock_owner
800 * that is compatible with current->files
801 */
802static struct nfs4_lock_state *
803__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
804{
805 struct nfs4_lock_state *pos;
806 list_for_each_entry(pos, &state->lock_states, ls_locks) {
807 if (pos->ls_owner != fl_owner)
808 continue;
809 atomic_inc(&pos->ls_count);
810 return pos;
811 }
812 return NULL;
813}
814
815/*
816 * Return a compatible lock_state. If no initialized lock_state structure
817 * exists, return an uninitialized one.
818 *
819 */
820static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
821{
822 struct nfs4_lock_state *lsp;
823 struct nfs_server *server = state->owner->so_server;
824
825 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
826 if (lsp == NULL)
827 return NULL;
828 nfs4_init_seqid_counter(&lsp->ls_seqid);
829 atomic_set(&lsp->ls_count, 1);
830 lsp->ls_state = state;
831 lsp->ls_owner = fl_owner;
832 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
833 if (lsp->ls_seqid.owner_id < 0)
834 goto out_free;
835 INIT_LIST_HEAD(&lsp->ls_locks);
836 return lsp;
837out_free:
838 kfree(lsp);
839 return NULL;
840}
841
842void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
843{
844 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
845 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
846 kfree(lsp);
847}
848
849/*
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
852 *
853 */
854static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
855{
856 struct nfs4_lock_state *lsp, *new = NULL;
857
858 for(;;) {
859 spin_lock(&state->state_lock);
860 lsp = __nfs4_find_lock_state(state, owner);
861 if (lsp != NULL)
862 break;
863 if (new != NULL) {
864 list_add(&new->ls_locks, &state->lock_states);
865 set_bit(LK_STATE_IN_USE, &state->flags);
866 lsp = new;
867 new = NULL;
868 break;
869 }
870 spin_unlock(&state->state_lock);
871 new = nfs4_alloc_lock_state(state, owner);
872 if (new == NULL)
873 return NULL;
874 }
875 spin_unlock(&state->state_lock);
876 if (new != NULL)
877 nfs4_free_lock_state(state->owner->so_server, new);
878 return lsp;
879}
880
881/*
882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
884 */
885void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
886{
887 struct nfs_server *server;
888 struct nfs4_state *state;
889
890 if (lsp == NULL)
891 return;
892 state = lsp->ls_state;
893 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
894 return;
895 list_del(&lsp->ls_locks);
896 if (list_empty(&state->lock_states))
897 clear_bit(LK_STATE_IN_USE, &state->flags);
898 spin_unlock(&state->state_lock);
899 server = state->owner->so_server;
900 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
901 struct nfs_client *clp = server->nfs_client;
902
903 clp->cl_mvops->free_lock_state(server, lsp);
904 } else
905 nfs4_free_lock_state(server, lsp);
906}
907
908static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
909{
910 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
911
912 dst->fl_u.nfs4_fl.owner = lsp;
913 atomic_inc(&lsp->ls_count);
914}
915
916static void nfs4_fl_release_lock(struct file_lock *fl)
917{
918 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
919}
920
921static const struct file_lock_operations nfs4_fl_lock_ops = {
922 .fl_copy_lock = nfs4_fl_copy_lock,
923 .fl_release_private = nfs4_fl_release_lock,
924};
925
926int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
927{
928 struct nfs4_lock_state *lsp;
929
930 if (fl->fl_ops != NULL)
931 return 0;
932 lsp = nfs4_get_lock_state(state, fl->fl_owner);
933 if (lsp == NULL)
934 return -ENOMEM;
935 fl->fl_u.nfs4_fl.owner = lsp;
936 fl->fl_ops = &nfs4_fl_lock_ops;
937 return 0;
938}
939
940static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
941 struct nfs4_state *state,
942 const struct nfs_lockowner *lockowner)
943{
944 struct nfs4_lock_state *lsp;
945 fl_owner_t fl_owner;
946 int ret = -ENOENT;
947
948
949 if (lockowner == NULL)
950 goto out;
951
952 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
953 goto out;
954
955 fl_owner = lockowner->l_owner;
956 spin_lock(&state->state_lock);
957 lsp = __nfs4_find_lock_state(state, fl_owner);
958 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
959 ret = -EIO;
960 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
961 nfs4_stateid_copy(dst, &lsp->ls_stateid);
962 ret = 0;
963 }
964 spin_unlock(&state->state_lock);
965 nfs4_put_lock_state(lsp);
966out:
967 return ret;
968}
969
970static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
971{
972 const nfs4_stateid *src;
973 int seq;
974
975 do {
976 src = &zero_stateid;
977 seq = read_seqbegin(&state->seqlock);
978 if (test_bit(NFS_OPEN_STATE, &state->flags))
979 src = &state->open_stateid;
980 nfs4_stateid_copy(dst, src);
981 } while (read_seqretry(&state->seqlock, seq));
982}
983
984/*
985 * Byte-range lock aware utility to initialize the stateid of read/write
986 * requests.
987 */
988int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
989 fmode_t fmode, const struct nfs_lockowner *lockowner)
990{
991 int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
992 if (ret == -EIO)
993 /* A lost lock - don't even consider delegations */
994 goto out;
995 /* returns true if delegation stateid found and copied */
996 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
997 ret = 0;
998 goto out;
999 }
1000 if (ret != -ENOENT)
1001 /* nfs4_copy_delegation_stateid() didn't over-write
1002 * dst, so it still has the lock stateid which we now
1003 * choose to use.
1004 */
1005 goto out;
1006 nfs4_copy_open_stateid(dst, state);
1007 ret = 0;
1008out:
1009 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1010 dst->seqid = 0;
1011 return ret;
1012}
1013
1014struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1015{
1016 struct nfs_seqid *new;
1017
1018 new = kmalloc(sizeof(*new), gfp_mask);
1019 if (new == NULL)
1020 return ERR_PTR(-ENOMEM);
1021 new->sequence = counter;
1022 INIT_LIST_HEAD(&new->list);
1023 new->task = NULL;
1024 return new;
1025}
1026
1027void nfs_release_seqid(struct nfs_seqid *seqid)
1028{
1029 struct nfs_seqid_counter *sequence;
1030
1031 if (seqid == NULL || list_empty(&seqid->list))
1032 return;
1033 sequence = seqid->sequence;
1034 spin_lock(&sequence->lock);
1035 list_del_init(&seqid->list);
1036 if (!list_empty(&sequence->list)) {
1037 struct nfs_seqid *next;
1038
1039 next = list_first_entry(&sequence->list,
1040 struct nfs_seqid, list);
1041 rpc_wake_up_queued_task(&sequence->wait, next->task);
1042 }
1043 spin_unlock(&sequence->lock);
1044}
1045
1046void nfs_free_seqid(struct nfs_seqid *seqid)
1047{
1048 nfs_release_seqid(seqid);
1049 kfree(seqid);
1050}
1051
1052/*
1053 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1054 * failed with a seqid incrementing error -
1055 * see comments nfs4.h:seqid_mutating_error()
1056 */
1057static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1058{
1059 switch (status) {
1060 case 0:
1061 break;
1062 case -NFS4ERR_BAD_SEQID:
1063 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1064 return;
1065 pr_warn_ratelimited("NFS: v4 server returned a bad"
1066 " sequence-id error on an"
1067 " unconfirmed sequence %p!\n",
1068 seqid->sequence);
1069 case -NFS4ERR_STALE_CLIENTID:
1070 case -NFS4ERR_STALE_STATEID:
1071 case -NFS4ERR_BAD_STATEID:
1072 case -NFS4ERR_BADXDR:
1073 case -NFS4ERR_RESOURCE:
1074 case -NFS4ERR_NOFILEHANDLE:
1075 /* Non-seqid mutating errors */
1076 return;
1077 };
1078 /*
1079 * Note: no locking needed as we are guaranteed to be first
1080 * on the sequence list
1081 */
1082 seqid->sequence->counter++;
1083}
1084
1085void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1086{
1087 struct nfs4_state_owner *sp;
1088
1089 if (seqid == NULL)
1090 return;
1091
1092 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1093 if (status == -NFS4ERR_BAD_SEQID)
1094 nfs4_drop_state_owner(sp);
1095 if (!nfs4_has_session(sp->so_server->nfs_client))
1096 nfs_increment_seqid(status, seqid);
1097}
1098
1099/*
1100 * Increment the seqid if the LOCK/LOCKU succeeded, or
1101 * failed with a seqid incrementing error -
1102 * see comments nfs4.h:seqid_mutating_error()
1103 */
1104void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1105{
1106 if (seqid != NULL)
1107 nfs_increment_seqid(status, seqid);
1108}
1109
1110int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1111{
1112 struct nfs_seqid_counter *sequence;
1113 int status = 0;
1114
1115 if (seqid == NULL)
1116 goto out;
1117 sequence = seqid->sequence;
1118 spin_lock(&sequence->lock);
1119 seqid->task = task;
1120 if (list_empty(&seqid->list))
1121 list_add_tail(&seqid->list, &sequence->list);
1122 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1123 goto unlock;
1124 rpc_sleep_on(&sequence->wait, task, NULL);
1125 status = -EAGAIN;
1126unlock:
1127 spin_unlock(&sequence->lock);
1128out:
1129 return status;
1130}
1131
1132static int nfs4_run_state_manager(void *);
1133
1134static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1135{
1136 smp_mb__before_atomic();
1137 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1138 smp_mb__after_atomic();
1139 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1140 rpc_wake_up(&clp->cl_rpcwaitq);
1141}
1142
1143/*
1144 * Schedule the nfs_client asynchronous state management routine
1145 */
1146void nfs4_schedule_state_manager(struct nfs_client *clp)
1147{
1148 struct task_struct *task;
1149 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1150
1151 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1152 return;
1153 __module_get(THIS_MODULE);
1154 atomic_inc(&clp->cl_count);
1155
1156 /* The rcu_read_lock() is not strictly necessary, as the state
1157 * manager is the only thread that ever changes the rpc_xprt
1158 * after it's initialized. At this point, we're single threaded. */
1159 rcu_read_lock();
1160 snprintf(buf, sizeof(buf), "%s-manager",
1161 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1162 rcu_read_unlock();
1163 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1164 if (IS_ERR(task)) {
1165 printk(KERN_ERR "%s: kthread_run: %ld\n",
1166 __func__, PTR_ERR(task));
1167 nfs4_clear_state_manager_bit(clp);
1168 nfs_put_client(clp);
1169 module_put(THIS_MODULE);
1170 }
1171}
1172
1173/*
1174 * Schedule a lease recovery attempt
1175 */
1176void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1177{
1178 if (!clp)
1179 return;
1180 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1181 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1182 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1183 clp->cl_hostname);
1184 nfs4_schedule_state_manager(clp);
1185}
1186EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1187
1188/**
1189 * nfs4_schedule_migration_recovery - trigger migration recovery
1190 *
1191 * @server: FSID that is migrating
1192 *
1193 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1194 * value is returned.
1195 */
1196int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1197{
1198 struct nfs_client *clp = server->nfs_client;
1199
1200 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1201 pr_err("NFS: volatile file handles not supported (server %s)\n",
1202 clp->cl_hostname);
1203 return -NFS4ERR_IO;
1204 }
1205
1206 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1207 return -NFS4ERR_IO;
1208
1209 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1210 __func__,
1211 (unsigned long long)server->fsid.major,
1212 (unsigned long long)server->fsid.minor,
1213 clp->cl_hostname);
1214
1215 set_bit(NFS_MIG_IN_TRANSITION,
1216 &((struct nfs_server *)server)->mig_status);
1217 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1218
1219 nfs4_schedule_state_manager(clp);
1220 return 0;
1221}
1222EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1223
1224/**
1225 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1226 *
1227 * @clp: server to check for moved leases
1228 *
1229 */
1230void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1231{
1232 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1233 __func__, clp->cl_clientid, clp->cl_hostname);
1234
1235 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1236 nfs4_schedule_state_manager(clp);
1237}
1238EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1239
1240int nfs4_wait_clnt_recover(struct nfs_client *clp)
1241{
1242 int res;
1243
1244 might_sleep();
1245
1246 atomic_inc(&clp->cl_count);
1247 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1248 nfs_wait_bit_killable, TASK_KILLABLE);
1249 if (res)
1250 goto out;
1251 if (clp->cl_cons_state < 0)
1252 res = clp->cl_cons_state;
1253out:
1254 nfs_put_client(clp);
1255 return res;
1256}
1257
1258int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1259{
1260 unsigned int loop;
1261 int ret;
1262
1263 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1264 ret = nfs4_wait_clnt_recover(clp);
1265 if (ret != 0)
1266 break;
1267 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1268 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1269 break;
1270 nfs4_schedule_state_manager(clp);
1271 ret = -EIO;
1272 }
1273 return ret;
1274}
1275
1276/*
1277 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1278 * @clp: client to process
1279 *
1280 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1281 * resend of the SETCLIENTID and hence re-establish the
1282 * callback channel. Then return all existing delegations.
1283 */
1284static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1285{
1286 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1287 nfs_expire_all_delegations(clp);
1288 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1289 clp->cl_hostname);
1290}
1291
1292void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1293{
1294 nfs40_handle_cb_pathdown(clp);
1295 nfs4_schedule_state_manager(clp);
1296}
1297
1298static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1299{
1300
1301 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1302 /* Don't recover state that expired before the reboot */
1303 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1304 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1305 return 0;
1306 }
1307 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1308 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1309 return 1;
1310}
1311
1312int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1313{
1314 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1315 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1316 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1317 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1318 return 1;
1319}
1320
1321int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1322{
1323 struct nfs_client *clp = server->nfs_client;
1324
1325 if (!nfs4_valid_open_stateid(state))
1326 return -EBADF;
1327 nfs4_state_mark_reclaim_nograce(clp, state);
1328 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1329 clp->cl_hostname);
1330 nfs4_schedule_state_manager(clp);
1331 return 0;
1332}
1333EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1334
1335void nfs_inode_find_state_and_recover(struct inode *inode,
1336 const nfs4_stateid *stateid)
1337{
1338 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1339 struct nfs_inode *nfsi = NFS_I(inode);
1340 struct nfs_open_context *ctx;
1341 struct nfs4_state *state;
1342 bool found = false;
1343
1344 spin_lock(&inode->i_lock);
1345 list_for_each_entry(ctx, &nfsi->open_files, list) {
1346 state = ctx->state;
1347 if (state == NULL)
1348 continue;
1349 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1350 continue;
1351 if (!nfs4_stateid_match(&state->stateid, stateid))
1352 continue;
1353 nfs4_state_mark_reclaim_nograce(clp, state);
1354 found = true;
1355 }
1356 spin_unlock(&inode->i_lock);
1357 if (found)
1358 nfs4_schedule_state_manager(clp);
1359}
1360
1361static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1362{
1363 struct inode *inode = state->inode;
1364 struct nfs_inode *nfsi = NFS_I(inode);
1365 struct nfs_open_context *ctx;
1366
1367 spin_lock(&inode->i_lock);
1368 list_for_each_entry(ctx, &nfsi->open_files, list) {
1369 if (ctx->state != state)
1370 continue;
1371 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1372 }
1373 spin_unlock(&inode->i_lock);
1374}
1375
1376static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1377{
1378 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1379 nfs4_state_mark_open_context_bad(state);
1380}
1381
1382
1383static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1384{
1385 struct inode *inode = state->inode;
1386 struct nfs_inode *nfsi = NFS_I(inode);
1387 struct file_lock *fl;
1388 int status = 0;
1389 struct file_lock_context *flctx = inode->i_flctx;
1390 struct list_head *list;
1391
1392 if (flctx == NULL)
1393 return 0;
1394
1395 list = &flctx->flc_posix;
1396
1397 /* Guard against delegation returns and new lock/unlock calls */
1398 down_write(&nfsi->rwsem);
1399 spin_lock(&flctx->flc_lock);
1400restart:
1401 list_for_each_entry(fl, list, fl_list) {
1402 if (nfs_file_open_context(fl->fl_file)->state != state)
1403 continue;
1404 spin_unlock(&flctx->flc_lock);
1405 status = ops->recover_lock(state, fl);
1406 switch (status) {
1407 case 0:
1408 break;
1409 case -ESTALE:
1410 case -NFS4ERR_ADMIN_REVOKED:
1411 case -NFS4ERR_STALE_STATEID:
1412 case -NFS4ERR_BAD_STATEID:
1413 case -NFS4ERR_EXPIRED:
1414 case -NFS4ERR_NO_GRACE:
1415 case -NFS4ERR_STALE_CLIENTID:
1416 case -NFS4ERR_BADSESSION:
1417 case -NFS4ERR_BADSLOT:
1418 case -NFS4ERR_BAD_HIGH_SLOT:
1419 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1420 goto out;
1421 default:
1422 pr_err("NFS: %s: unhandled error %d\n",
1423 __func__, status);
1424 case -ENOMEM:
1425 case -NFS4ERR_DENIED:
1426 case -NFS4ERR_RECLAIM_BAD:
1427 case -NFS4ERR_RECLAIM_CONFLICT:
1428 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1429 status = 0;
1430 }
1431 spin_lock(&flctx->flc_lock);
1432 }
1433 if (list == &flctx->flc_posix) {
1434 list = &flctx->flc_flock;
1435 goto restart;
1436 }
1437 spin_unlock(&flctx->flc_lock);
1438out:
1439 up_write(&nfsi->rwsem);
1440 return status;
1441}
1442
1443static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1444{
1445 struct nfs4_state *state;
1446 struct nfs4_lock_state *lock;
1447 int status = 0;
1448
1449 /* Note: we rely on the sp->so_states list being ordered
1450 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1451 * states first.
1452 * This is needed to ensure that the server won't give us any
1453 * read delegations that we have to return if, say, we are
1454 * recovering after a network partition or a reboot from a
1455 * server that doesn't support a grace period.
1456 */
1457 spin_lock(&sp->so_lock);
1458 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1459restart:
1460 list_for_each_entry(state, &sp->so_states, open_states) {
1461 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1462 continue;
1463 if (!nfs4_valid_open_stateid(state))
1464 continue;
1465 if (state->state == 0)
1466 continue;
1467 atomic_inc(&state->count);
1468 spin_unlock(&sp->so_lock);
1469 status = ops->recover_open(sp, state);
1470 if (status >= 0) {
1471 status = nfs4_reclaim_locks(state, ops);
1472 if (status >= 0) {
1473 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1474 spin_lock(&state->state_lock);
1475 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1476 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1477 pr_warn_ratelimited("NFS: "
1478 "%s: Lock reclaim "
1479 "failed!\n", __func__);
1480 }
1481 spin_unlock(&state->state_lock);
1482 }
1483 nfs4_put_open_state(state);
1484 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1485 &state->flags);
1486 spin_lock(&sp->so_lock);
1487 goto restart;
1488 }
1489 }
1490 switch (status) {
1491 default:
1492 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1493 __func__, status);
1494 case -ENOENT:
1495 case -ENOMEM:
1496 case -ESTALE:
1497 /* Open state on this file cannot be recovered */
1498 nfs4_state_mark_recovery_failed(state, status);
1499 break;
1500 case -EAGAIN:
1501 ssleep(1);
1502 case -NFS4ERR_ADMIN_REVOKED:
1503 case -NFS4ERR_STALE_STATEID:
1504 case -NFS4ERR_BAD_STATEID:
1505 case -NFS4ERR_RECLAIM_BAD:
1506 case -NFS4ERR_RECLAIM_CONFLICT:
1507 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1508 break;
1509 case -NFS4ERR_EXPIRED:
1510 case -NFS4ERR_NO_GRACE:
1511 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1512 case -NFS4ERR_STALE_CLIENTID:
1513 case -NFS4ERR_BADSESSION:
1514 case -NFS4ERR_BADSLOT:
1515 case -NFS4ERR_BAD_HIGH_SLOT:
1516 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1517 goto out_err;
1518 }
1519 nfs4_put_open_state(state);
1520 spin_lock(&sp->so_lock);
1521 goto restart;
1522 }
1523 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1524 spin_unlock(&sp->so_lock);
1525 return 0;
1526out_err:
1527 nfs4_put_open_state(state);
1528 spin_lock(&sp->so_lock);
1529 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1530 spin_unlock(&sp->so_lock);
1531 return status;
1532}
1533
1534static void nfs4_clear_open_state(struct nfs4_state *state)
1535{
1536 struct nfs4_lock_state *lock;
1537
1538 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1539 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1540 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1541 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1542 spin_lock(&state->state_lock);
1543 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1544 lock->ls_seqid.flags = 0;
1545 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1546 }
1547 spin_unlock(&state->state_lock);
1548}
1549
1550static void nfs4_reset_seqids(struct nfs_server *server,
1551 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1552{
1553 struct nfs_client *clp = server->nfs_client;
1554 struct nfs4_state_owner *sp;
1555 struct rb_node *pos;
1556 struct nfs4_state *state;
1557
1558 spin_lock(&clp->cl_lock);
1559 for (pos = rb_first(&server->state_owners);
1560 pos != NULL;
1561 pos = rb_next(pos)) {
1562 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1563 sp->so_seqid.flags = 0;
1564 spin_lock(&sp->so_lock);
1565 list_for_each_entry(state, &sp->so_states, open_states) {
1566 if (mark_reclaim(clp, state))
1567 nfs4_clear_open_state(state);
1568 }
1569 spin_unlock(&sp->so_lock);
1570 }
1571 spin_unlock(&clp->cl_lock);
1572}
1573
1574static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1575 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1576{
1577 struct nfs_server *server;
1578
1579 rcu_read_lock();
1580 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1581 nfs4_reset_seqids(server, mark_reclaim);
1582 rcu_read_unlock();
1583}
1584
1585static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1586{
1587 /* Mark all delegations for reclaim */
1588 nfs_delegation_mark_reclaim(clp);
1589 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1590}
1591
1592static void nfs4_reclaim_complete(struct nfs_client *clp,
1593 const struct nfs4_state_recovery_ops *ops,
1594 struct rpc_cred *cred)
1595{
1596 /* Notify the server we're done reclaiming our state */
1597 if (ops->reclaim_complete)
1598 (void)ops->reclaim_complete(clp, cred);
1599}
1600
1601static void nfs4_clear_reclaim_server(struct nfs_server *server)
1602{
1603 struct nfs_client *clp = server->nfs_client;
1604 struct nfs4_state_owner *sp;
1605 struct rb_node *pos;
1606 struct nfs4_state *state;
1607
1608 spin_lock(&clp->cl_lock);
1609 for (pos = rb_first(&server->state_owners);
1610 pos != NULL;
1611 pos = rb_next(pos)) {
1612 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1613 spin_lock(&sp->so_lock);
1614 list_for_each_entry(state, &sp->so_states, open_states) {
1615 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1616 &state->flags))
1617 continue;
1618 nfs4_state_mark_reclaim_nograce(clp, state);
1619 }
1620 spin_unlock(&sp->so_lock);
1621 }
1622 spin_unlock(&clp->cl_lock);
1623}
1624
1625static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1626{
1627 struct nfs_server *server;
1628
1629 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1630 return 0;
1631
1632 rcu_read_lock();
1633 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1634 nfs4_clear_reclaim_server(server);
1635 rcu_read_unlock();
1636
1637 nfs_delegation_reap_unclaimed(clp);
1638 return 1;
1639}
1640
1641static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1642{
1643 const struct nfs4_state_recovery_ops *ops;
1644 struct rpc_cred *cred;
1645
1646 if (!nfs4_state_clear_reclaim_reboot(clp))
1647 return;
1648 ops = clp->cl_mvops->reboot_recovery_ops;
1649 cred = nfs4_get_clid_cred(clp);
1650 nfs4_reclaim_complete(clp, ops, cred);
1651 put_rpccred(cred);
1652}
1653
1654static void nfs_delegation_clear_all(struct nfs_client *clp)
1655{
1656 nfs_delegation_mark_reclaim(clp);
1657 nfs_delegation_reap_unclaimed(clp);
1658}
1659
1660static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1661{
1662 nfs_delegation_clear_all(clp);
1663 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1664}
1665
1666static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1667{
1668 switch (error) {
1669 case 0:
1670 break;
1671 case -NFS4ERR_CB_PATH_DOWN:
1672 nfs40_handle_cb_pathdown(clp);
1673 break;
1674 case -NFS4ERR_NO_GRACE:
1675 nfs4_state_end_reclaim_reboot(clp);
1676 break;
1677 case -NFS4ERR_STALE_CLIENTID:
1678 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1679 nfs4_state_clear_reclaim_reboot(clp);
1680 nfs4_state_start_reclaim_reboot(clp);
1681 break;
1682 case -NFS4ERR_EXPIRED:
1683 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1684 nfs4_state_start_reclaim_nograce(clp);
1685 break;
1686 case -NFS4ERR_BADSESSION:
1687 case -NFS4ERR_BADSLOT:
1688 case -NFS4ERR_BAD_HIGH_SLOT:
1689 case -NFS4ERR_DEADSESSION:
1690 case -NFS4ERR_SEQ_FALSE_RETRY:
1691 case -NFS4ERR_SEQ_MISORDERED:
1692 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1693 /* Zero session reset errors */
1694 break;
1695 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1696 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1697 break;
1698 default:
1699 dprintk("%s: failed to handle error %d for server %s\n",
1700 __func__, error, clp->cl_hostname);
1701 return error;
1702 }
1703 dprintk("%s: handled error %d for server %s\n", __func__, error,
1704 clp->cl_hostname);
1705 return 0;
1706}
1707
1708static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1709{
1710 struct nfs4_state_owner *sp;
1711 struct nfs_server *server;
1712 struct rb_node *pos;
1713 int status = 0;
1714
1715restart:
1716 rcu_read_lock();
1717 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1718 nfs4_purge_state_owners(server);
1719 spin_lock(&clp->cl_lock);
1720 for (pos = rb_first(&server->state_owners);
1721 pos != NULL;
1722 pos = rb_next(pos)) {
1723 sp = rb_entry(pos,
1724 struct nfs4_state_owner, so_server_node);
1725 if (!test_and_clear_bit(ops->owner_flag_bit,
1726 &sp->so_flags))
1727 continue;
1728 if (!atomic_inc_not_zero(&sp->so_count))
1729 continue;
1730 spin_unlock(&clp->cl_lock);
1731 rcu_read_unlock();
1732
1733 status = nfs4_reclaim_open_state(sp, ops);
1734 if (status < 0) {
1735 set_bit(ops->owner_flag_bit, &sp->so_flags);
1736 nfs4_put_state_owner(sp);
1737 status = nfs4_recovery_handle_error(clp, status);
1738 return (status != 0) ? status : -EAGAIN;
1739 }
1740
1741 nfs4_put_state_owner(sp);
1742 goto restart;
1743 }
1744 spin_unlock(&clp->cl_lock);
1745 }
1746 rcu_read_unlock();
1747 return 0;
1748}
1749
1750static int nfs4_check_lease(struct nfs_client *clp)
1751{
1752 struct rpc_cred *cred;
1753 const struct nfs4_state_maintenance_ops *ops =
1754 clp->cl_mvops->state_renewal_ops;
1755 int status;
1756
1757 /* Is the client already known to have an expired lease? */
1758 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1759 return 0;
1760 spin_lock(&clp->cl_lock);
1761 cred = ops->get_state_renewal_cred_locked(clp);
1762 spin_unlock(&clp->cl_lock);
1763 if (cred == NULL) {
1764 cred = nfs4_get_clid_cred(clp);
1765 status = -ENOKEY;
1766 if (cred == NULL)
1767 goto out;
1768 }
1769 status = ops->renew_lease(clp, cred);
1770 put_rpccred(cred);
1771 if (status == -ETIMEDOUT) {
1772 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1773 return 0;
1774 }
1775out:
1776 return nfs4_recovery_handle_error(clp, status);
1777}
1778
1779/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1780 * and for recoverable errors on EXCHANGE_ID for v4.1
1781 */
1782static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1783{
1784 switch (status) {
1785 case -NFS4ERR_SEQ_MISORDERED:
1786 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1787 return -ESERVERFAULT;
1788 /* Lease confirmation error: retry after purging the lease */
1789 ssleep(1);
1790 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1791 break;
1792 case -NFS4ERR_STALE_CLIENTID:
1793 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1794 nfs4_state_start_reclaim_reboot(clp);
1795 break;
1796 case -NFS4ERR_CLID_INUSE:
1797 pr_err("NFS: Server %s reports our clientid is in use\n",
1798 clp->cl_hostname);
1799 nfs_mark_client_ready(clp, -EPERM);
1800 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1801 return -EPERM;
1802 case -EACCES:
1803 case -NFS4ERR_DELAY:
1804 case -ETIMEDOUT:
1805 case -EAGAIN:
1806 ssleep(1);
1807 break;
1808
1809 case -NFS4ERR_MINOR_VERS_MISMATCH:
1810 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1811 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1812 dprintk("%s: exit with error %d for server %s\n",
1813 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1814 return -EPROTONOSUPPORT;
1815 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1816 * in nfs4_exchange_id */
1817 default:
1818 dprintk("%s: exit with error %d for server %s\n", __func__,
1819 status, clp->cl_hostname);
1820 return status;
1821 }
1822 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1823 dprintk("%s: handled error %d for server %s\n", __func__, status,
1824 clp->cl_hostname);
1825 return 0;
1826}
1827
1828static int nfs4_establish_lease(struct nfs_client *clp)
1829{
1830 struct rpc_cred *cred;
1831 const struct nfs4_state_recovery_ops *ops =
1832 clp->cl_mvops->reboot_recovery_ops;
1833 int status;
1834
1835 nfs4_begin_drain_session(clp);
1836 cred = nfs4_get_clid_cred(clp);
1837 if (cred == NULL)
1838 return -ENOENT;
1839 status = ops->establish_clid(clp, cred);
1840 put_rpccred(cred);
1841 if (status != 0)
1842 return status;
1843 pnfs_destroy_all_layouts(clp);
1844 return 0;
1845}
1846
1847/*
1848 * Returns zero or a negative errno. NFS4ERR values are converted
1849 * to local errno values.
1850 */
1851static int nfs4_reclaim_lease(struct nfs_client *clp)
1852{
1853 int status;
1854
1855 status = nfs4_establish_lease(clp);
1856 if (status < 0)
1857 return nfs4_handle_reclaim_lease_error(clp, status);
1858 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1859 nfs4_state_start_reclaim_nograce(clp);
1860 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1861 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1862 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1863 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1864 return 0;
1865}
1866
1867static int nfs4_purge_lease(struct nfs_client *clp)
1868{
1869 int status;
1870
1871 status = nfs4_establish_lease(clp);
1872 if (status < 0)
1873 return nfs4_handle_reclaim_lease_error(clp, status);
1874 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1875 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1876 nfs4_state_start_reclaim_nograce(clp);
1877 return 0;
1878}
1879
1880/*
1881 * Try remote migration of one FSID from a source server to a
1882 * destination server. The source server provides a list of
1883 * potential destinations.
1884 *
1885 * Returns zero or a negative NFS4ERR status code.
1886 */
1887static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1888{
1889 struct nfs_client *clp = server->nfs_client;
1890 struct nfs4_fs_locations *locations = NULL;
1891 struct inode *inode;
1892 struct page *page;
1893 int status, result;
1894
1895 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1896 (unsigned long long)server->fsid.major,
1897 (unsigned long long)server->fsid.minor,
1898 clp->cl_hostname);
1899
1900 result = 0;
1901 page = alloc_page(GFP_KERNEL);
1902 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1903 if (page == NULL || locations == NULL) {
1904 dprintk("<-- %s: no memory\n", __func__);
1905 goto out;
1906 }
1907
1908 inode = d_inode(server->super->s_root);
1909 result = nfs4_proc_get_locations(inode, locations, page, cred);
1910 if (result) {
1911 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1912 __func__, result);
1913 goto out;
1914 }
1915
1916 result = -NFS4ERR_NXIO;
1917 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1918 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1919 __func__);
1920 goto out;
1921 }
1922
1923 nfs4_begin_drain_session(clp);
1924
1925 status = nfs4_replace_transport(server, locations);
1926 if (status != 0) {
1927 dprintk("<-- %s: failed to replace transport: %d\n",
1928 __func__, status);
1929 goto out;
1930 }
1931
1932 result = 0;
1933 dprintk("<-- %s: migration succeeded\n", __func__);
1934
1935out:
1936 if (page != NULL)
1937 __free_page(page);
1938 kfree(locations);
1939 if (result) {
1940 pr_err("NFS: migration recovery failed (server %s)\n",
1941 clp->cl_hostname);
1942 set_bit(NFS_MIG_FAILED, &server->mig_status);
1943 }
1944 return result;
1945}
1946
1947/*
1948 * Returns zero or a negative NFS4ERR status code.
1949 */
1950static int nfs4_handle_migration(struct nfs_client *clp)
1951{
1952 const struct nfs4_state_maintenance_ops *ops =
1953 clp->cl_mvops->state_renewal_ops;
1954 struct nfs_server *server;
1955 struct rpc_cred *cred;
1956
1957 dprintk("%s: migration reported on \"%s\"\n", __func__,
1958 clp->cl_hostname);
1959
1960 spin_lock(&clp->cl_lock);
1961 cred = ops->get_state_renewal_cred_locked(clp);
1962 spin_unlock(&clp->cl_lock);
1963 if (cred == NULL)
1964 return -NFS4ERR_NOENT;
1965
1966 clp->cl_mig_gen++;
1967restart:
1968 rcu_read_lock();
1969 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1970 int status;
1971
1972 if (server->mig_gen == clp->cl_mig_gen)
1973 continue;
1974 server->mig_gen = clp->cl_mig_gen;
1975
1976 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
1977 &server->mig_status))
1978 continue;
1979
1980 rcu_read_unlock();
1981 status = nfs4_try_migration(server, cred);
1982 if (status < 0) {
1983 put_rpccred(cred);
1984 return status;
1985 }
1986 goto restart;
1987 }
1988 rcu_read_unlock();
1989 put_rpccred(cred);
1990 return 0;
1991}
1992
1993/*
1994 * Test each nfs_server on the clp's cl_superblocks list to see
1995 * if it's moved to another server. Stop when the server no longer
1996 * returns NFS4ERR_LEASE_MOVED.
1997 */
1998static int nfs4_handle_lease_moved(struct nfs_client *clp)
1999{
2000 const struct nfs4_state_maintenance_ops *ops =
2001 clp->cl_mvops->state_renewal_ops;
2002 struct nfs_server *server;
2003 struct rpc_cred *cred;
2004
2005 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2006 clp->cl_hostname);
2007
2008 spin_lock(&clp->cl_lock);
2009 cred = ops->get_state_renewal_cred_locked(clp);
2010 spin_unlock(&clp->cl_lock);
2011 if (cred == NULL)
2012 return -NFS4ERR_NOENT;
2013
2014 clp->cl_mig_gen++;
2015restart:
2016 rcu_read_lock();
2017 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2018 struct inode *inode;
2019 int status;
2020
2021 if (server->mig_gen == clp->cl_mig_gen)
2022 continue;
2023 server->mig_gen = clp->cl_mig_gen;
2024
2025 rcu_read_unlock();
2026
2027 inode = d_inode(server->super->s_root);
2028 status = nfs4_proc_fsid_present(inode, cred);
2029 if (status != -NFS4ERR_MOVED)
2030 goto restart; /* wasn't this one */
2031 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2032 goto restart; /* there are more */
2033 goto out;
2034 }
2035 rcu_read_unlock();
2036
2037out:
2038 put_rpccred(cred);
2039 return 0;
2040}
2041
2042/**
2043 * nfs4_discover_server_trunking - Detect server IP address trunking
2044 *
2045 * @clp: nfs_client under test
2046 * @result: OUT: found nfs_client, or clp
2047 *
2048 * Returns zero or a negative errno. If zero is returned,
2049 * an nfs_client pointer is planted in "result".
2050 *
2051 * Note: since we are invoked in process context, and
2052 * not from inside the state manager, we cannot use
2053 * nfs4_handle_reclaim_lease_error().
2054 */
2055int nfs4_discover_server_trunking(struct nfs_client *clp,
2056 struct nfs_client **result)
2057{
2058 const struct nfs4_state_recovery_ops *ops =
2059 clp->cl_mvops->reboot_recovery_ops;
2060 struct rpc_clnt *clnt;
2061 struct rpc_cred *cred;
2062 int i, status;
2063
2064 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2065
2066 clnt = clp->cl_rpcclient;
2067 i = 0;
2068
2069 mutex_lock(&nfs_clid_init_mutex);
2070again:
2071 status = -ENOENT;
2072 cred = nfs4_get_clid_cred(clp);
2073 if (cred == NULL)
2074 goto out_unlock;
2075
2076 status = ops->detect_trunking(clp, result, cred);
2077 put_rpccred(cred);
2078 switch (status) {
2079 case 0:
2080 break;
2081 case -ETIMEDOUT:
2082 if (clnt->cl_softrtry)
2083 break;
2084 case -NFS4ERR_DELAY:
2085 case -EAGAIN:
2086 ssleep(1);
2087 case -NFS4ERR_STALE_CLIENTID:
2088 dprintk("NFS: %s after status %d, retrying\n",
2089 __func__, status);
2090 goto again;
2091 case -EACCES:
2092 if (i++ == 0) {
2093 nfs4_root_machine_cred(clp);
2094 goto again;
2095 }
2096 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2097 break;
2098 case -NFS4ERR_CLID_INUSE:
2099 case -NFS4ERR_WRONGSEC:
2100 /* No point in retrying if we already used RPC_AUTH_UNIX */
2101 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2102 status = -EPERM;
2103 break;
2104 }
2105 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2106 if (IS_ERR(clnt)) {
2107 status = PTR_ERR(clnt);
2108 break;
2109 }
2110 /* Note: this is safe because we haven't yet marked the
2111 * client as ready, so we are the only user of
2112 * clp->cl_rpcclient
2113 */
2114 clnt = xchg(&clp->cl_rpcclient, clnt);
2115 rpc_shutdown_client(clnt);
2116 clnt = clp->cl_rpcclient;
2117 goto again;
2118
2119 case -NFS4ERR_MINOR_VERS_MISMATCH:
2120 status = -EPROTONOSUPPORT;
2121 break;
2122
2123 case -EKEYEXPIRED:
2124 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2125 * in nfs4_exchange_id */
2126 status = -EKEYEXPIRED;
2127 break;
2128 default:
2129 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2130 __func__, status);
2131 status = -EIO;
2132 }
2133
2134out_unlock:
2135 mutex_unlock(&nfs_clid_init_mutex);
2136 dprintk("NFS: %s: status = %d\n", __func__, status);
2137 return status;
2138}
2139
2140#ifdef CONFIG_NFS_V4_1
2141void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2142{
2143 struct nfs_client *clp = session->clp;
2144
2145 switch (err) {
2146 default:
2147 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2148 break;
2149 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2150 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2151 }
2152 nfs4_schedule_lease_recovery(clp);
2153}
2154EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2155
2156void nfs41_notify_server(struct nfs_client *clp)
2157{
2158 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2159 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2160 nfs4_schedule_state_manager(clp);
2161}
2162
2163static void nfs4_reset_all_state(struct nfs_client *clp)
2164{
2165 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2166 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2167 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2168 nfs4_state_start_reclaim_nograce(clp);
2169 dprintk("%s: scheduling reset of all state for server %s!\n",
2170 __func__, clp->cl_hostname);
2171 nfs4_schedule_state_manager(clp);
2172 }
2173}
2174
2175static void nfs41_handle_server_reboot(struct nfs_client *clp)
2176{
2177 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2178 nfs4_state_start_reclaim_reboot(clp);
2179 dprintk("%s: server %s rebooted!\n", __func__,
2180 clp->cl_hostname);
2181 nfs4_schedule_state_manager(clp);
2182 }
2183}
2184
2185static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2186{
2187 nfs4_reset_all_state(clp);
2188 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2189}
2190
2191static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2192{
2193 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
2194 nfs4_schedule_state_manager(clp);
2195
2196 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2197}
2198
2199static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2200{
2201 /* FIXME: For now, we destroy all layouts. */
2202 pnfs_destroy_all_layouts(clp);
2203 /* FIXME: For now, we test all delegations+open state+locks. */
2204 nfs41_handle_some_state_revoked(clp);
2205 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2206 clp->cl_hostname);
2207}
2208
2209static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2210{
2211 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2212 nfs4_schedule_state_manager(clp);
2213
2214 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2215 clp->cl_hostname);
2216}
2217
2218static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2219{
2220 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2221 &clp->cl_state) == 0)
2222 nfs4_schedule_state_manager(clp);
2223}
2224
2225void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2226{
2227 if (!flags)
2228 return;
2229
2230 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2231 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2232
2233 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2234 nfs41_handle_server_reboot(clp);
2235 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2236 nfs41_handle_all_state_revoked(clp);
2237 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2238 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2239 nfs41_handle_some_state_revoked(clp);
2240 if (flags & SEQ4_STATUS_LEASE_MOVED)
2241 nfs4_schedule_lease_moved_recovery(clp);
2242 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2243 nfs41_handle_recallable_state_revoked(clp);
2244 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2245 nfs41_handle_backchannel_fault(clp);
2246 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2247 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2248 nfs41_handle_cb_path_down(clp);
2249}
2250
2251static int nfs4_reset_session(struct nfs_client *clp)
2252{
2253 struct rpc_cred *cred;
2254 int status;
2255
2256 if (!nfs4_has_session(clp))
2257 return 0;
2258 nfs4_begin_drain_session(clp);
2259 cred = nfs4_get_clid_cred(clp);
2260 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2261 switch (status) {
2262 case 0:
2263 case -NFS4ERR_BADSESSION:
2264 case -NFS4ERR_DEADSESSION:
2265 break;
2266 case -NFS4ERR_BACK_CHAN_BUSY:
2267 case -NFS4ERR_DELAY:
2268 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2269 status = 0;
2270 ssleep(1);
2271 goto out;
2272 default:
2273 status = nfs4_recovery_handle_error(clp, status);
2274 goto out;
2275 }
2276
2277 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2278 status = nfs4_proc_create_session(clp, cred);
2279 if (status) {
2280 dprintk("%s: session reset failed with status %d for server %s!\n",
2281 __func__, status, clp->cl_hostname);
2282 status = nfs4_handle_reclaim_lease_error(clp, status);
2283 goto out;
2284 }
2285 nfs41_finish_session_reset(clp);
2286 dprintk("%s: session reset was successful for server %s!\n",
2287 __func__, clp->cl_hostname);
2288out:
2289 if (cred)
2290 put_rpccred(cred);
2291 return status;
2292}
2293
2294static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2295{
2296 struct rpc_cred *cred;
2297 int ret;
2298
2299 if (!nfs4_has_session(clp))
2300 return 0;
2301 nfs4_begin_drain_session(clp);
2302 cred = nfs4_get_clid_cred(clp);
2303 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2304 if (cred)
2305 put_rpccred(cred);
2306 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2307 switch (ret) {
2308 case 0:
2309 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2310 __func__, clp->cl_hostname);
2311 break;
2312 case -NFS4ERR_DELAY:
2313 ssleep(1);
2314 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2315 break;
2316 default:
2317 return nfs4_recovery_handle_error(clp, ret);
2318 }
2319 return 0;
2320}
2321#else /* CONFIG_NFS_V4_1 */
2322static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2323
2324static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2325{
2326 return 0;
2327}
2328#endif /* CONFIG_NFS_V4_1 */
2329
2330static void nfs4_state_manager(struct nfs_client *clp)
2331{
2332 int status = 0;
2333 const char *section = "", *section_sep = "";
2334
2335 /* Ensure exclusive access to NFSv4 state */
2336 do {
2337 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2338 section = "purge state";
2339 status = nfs4_purge_lease(clp);
2340 if (status < 0)
2341 goto out_error;
2342 continue;
2343 }
2344
2345 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2346 section = "lease expired";
2347 /* We're going to have to re-establish a clientid */
2348 status = nfs4_reclaim_lease(clp);
2349 if (status < 0)
2350 goto out_error;
2351 continue;
2352 }
2353
2354 /* Initialize or reset the session */
2355 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2356 section = "reset session";
2357 status = nfs4_reset_session(clp);
2358 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2359 continue;
2360 if (status < 0)
2361 goto out_error;
2362 }
2363
2364 /* Send BIND_CONN_TO_SESSION */
2365 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2366 &clp->cl_state)) {
2367 section = "bind conn to session";
2368 status = nfs4_bind_conn_to_session(clp);
2369 if (status < 0)
2370 goto out_error;
2371 continue;
2372 }
2373
2374 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2375 section = "check lease";
2376 status = nfs4_check_lease(clp);
2377 if (status < 0)
2378 goto out_error;
2379 continue;
2380 }
2381
2382 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2383 section = "migration";
2384 status = nfs4_handle_migration(clp);
2385 if (status < 0)
2386 goto out_error;
2387 }
2388
2389 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2390 section = "lease moved";
2391 status = nfs4_handle_lease_moved(clp);
2392 if (status < 0)
2393 goto out_error;
2394 }
2395
2396 /* First recover reboot state... */
2397 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2398 section = "reclaim reboot";
2399 status = nfs4_do_reclaim(clp,
2400 clp->cl_mvops->reboot_recovery_ops);
2401 if (status == -EAGAIN)
2402 continue;
2403 if (status < 0)
2404 goto out_error;
2405 nfs4_state_end_reclaim_reboot(clp);
2406 }
2407
2408 /* Now recover expired state... */
2409 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2410 section = "reclaim nograce";
2411 status = nfs4_do_reclaim(clp,
2412 clp->cl_mvops->nograce_recovery_ops);
2413 if (status == -EAGAIN)
2414 continue;
2415 if (status < 0)
2416 goto out_error;
2417 }
2418
2419 nfs4_end_drain_session(clp);
2420 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2421 nfs_client_return_marked_delegations(clp);
2422 continue;
2423 }
2424
2425 nfs4_clear_state_manager_bit(clp);
2426 /* Did we race with an attempt to give us more work? */
2427 if (clp->cl_state == 0)
2428 break;
2429 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2430 break;
2431 } while (atomic_read(&clp->cl_count) > 1);
2432 return;
2433out_error:
2434 if (strlen(section))
2435 section_sep = ": ";
2436 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2437 " with error %d\n", section_sep, section,
2438 clp->cl_hostname, -status);
2439 ssleep(1);
2440 nfs4_end_drain_session(clp);
2441 nfs4_clear_state_manager_bit(clp);
2442}
2443
2444static int nfs4_run_state_manager(void *ptr)
2445{
2446 struct nfs_client *clp = ptr;
2447
2448 allow_signal(SIGKILL);
2449 nfs4_state_manager(clp);
2450 nfs_put_client(clp);
2451 module_put_and_exit(0);
2452 return 0;
2453}
2454
2455/*
2456 * Local variables:
2457 * c-basic-offset: 8
2458 * End:
2459 */