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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#include <linux/sched/mm.h>
53
54#include <linux/sunrpc/clnt.h>
55
56#include "nfs4_fs.h"
57#include "callback.h"
58#include "delegation.h"
59#include "internal.h"
60#include "nfs4idmap.h"
61#include "nfs4session.h"
62#include "pnfs.h"
63#include "netns.h"
64#include "nfs4trace.h"
65
66#define NFSDBG_FACILITY NFSDBG_STATE
67
68#define OPENOWNER_POOL_SIZE 8
69
70static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp);
71
72const nfs4_stateid zero_stateid = {
73 { .data = { 0 } },
74 .type = NFS4_SPECIAL_STATEID_TYPE,
75};
76const nfs4_stateid invalid_stateid = {
77 {
78 /* Funky initialiser keeps older gcc versions happy */
79 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
80 },
81 .type = NFS4_INVALID_STATEID_TYPE,
82};
83
84const nfs4_stateid current_stateid = {
85 {
86 /* Funky initialiser keeps older gcc versions happy */
87 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
88 },
89 .type = NFS4_SPECIAL_STATEID_TYPE,
90};
91
92static DEFINE_MUTEX(nfs_clid_init_mutex);
93
94static int nfs4_setup_state_renewal(struct nfs_client *clp)
95{
96 int status;
97 struct nfs_fsinfo fsinfo;
98
99 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
100 nfs4_schedule_state_renewal(clp);
101 return 0;
102 }
103
104 status = nfs4_proc_get_lease_time(clp, &fsinfo);
105 if (status == 0) {
106 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
107 nfs4_schedule_state_renewal(clp);
108 }
109
110 return status;
111}
112
113int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
114{
115 struct nfs4_setclientid_res clid = {
116 .clientid = clp->cl_clientid,
117 .confirm = clp->cl_confirm,
118 };
119 unsigned short port;
120 int status;
121 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
122
123 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
124 goto do_confirm;
125 port = nn->nfs_callback_tcpport;
126 if (clp->cl_addr.ss_family == AF_INET6)
127 port = nn->nfs_callback_tcpport6;
128
129 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
130 if (status != 0)
131 goto out;
132 clp->cl_clientid = clid.clientid;
133 clp->cl_confirm = clid.confirm;
134 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
135do_confirm:
136 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
137 if (status != 0)
138 goto out;
139 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
140 nfs4_setup_state_renewal(clp);
141out:
142 return status;
143}
144
145/**
146 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
147 *
148 * @clp: nfs_client under test
149 * @result: OUT: found nfs_client, or clp
150 * @cred: credential to use for trunking test
151 *
152 * Returns zero, a negative errno, or a negative NFS4ERR status.
153 * If zero is returned, an nfs_client pointer is planted in
154 * "result".
155 *
156 * Note: The returned client may not yet be marked ready.
157 */
158int nfs40_discover_server_trunking(struct nfs_client *clp,
159 struct nfs_client **result,
160 const struct cred *cred)
161{
162 struct nfs4_setclientid_res clid = {
163 .clientid = clp->cl_clientid,
164 .confirm = clp->cl_confirm,
165 };
166 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
167 unsigned short port;
168 int status;
169
170 port = nn->nfs_callback_tcpport;
171 if (clp->cl_addr.ss_family == AF_INET6)
172 port = nn->nfs_callback_tcpport6;
173
174 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
175 if (status != 0)
176 goto out;
177 clp->cl_clientid = clid.clientid;
178 clp->cl_confirm = clid.confirm;
179
180 status = nfs40_walk_client_list(clp, result, cred);
181 if (status == 0) {
182 /* Sustain the lease, even if it's empty. If the clientid4
183 * goes stale it's of no use for trunking discovery. */
184 nfs4_schedule_state_renewal(*result);
185
186 /* If the client state need to recover, do it. */
187 if (clp->cl_state)
188 nfs4_schedule_state_manager(clp);
189 }
190out:
191 return status;
192}
193
194const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
195{
196 return get_cred(rpc_machine_cred());
197}
198
199static void nfs4_root_machine_cred(struct nfs_client *clp)
200{
201
202 /* Force root creds instead of machine */
203 clp->cl_principal = NULL;
204 clp->cl_rpcclient->cl_principal = NULL;
205}
206
207static const struct cred *
208nfs4_get_renew_cred_server_locked(struct nfs_server *server)
209{
210 const struct cred *cred = NULL;
211 struct nfs4_state_owner *sp;
212 struct rb_node *pos;
213
214 for (pos = rb_first(&server->state_owners);
215 pos != NULL;
216 pos = rb_next(pos)) {
217 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
218 if (list_empty(&sp->so_states))
219 continue;
220 cred = get_cred(sp->so_cred);
221 break;
222 }
223 return cred;
224}
225
226/**
227 * nfs4_get_renew_cred - Acquire credential for a renew operation
228 * @clp: client state handle
229 *
230 * Returns an rpc_cred with reference count bumped, or NULL.
231 * Caller must hold clp->cl_lock.
232 */
233const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
234{
235 const struct cred *cred = NULL;
236 struct nfs_server *server;
237
238 /* Use machine credentials if available */
239 cred = nfs4_get_machine_cred(clp);
240 if (cred != NULL)
241 goto out;
242
243 spin_lock(&clp->cl_lock);
244 rcu_read_lock();
245 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
246 cred = nfs4_get_renew_cred_server_locked(server);
247 if (cred != NULL)
248 break;
249 }
250 rcu_read_unlock();
251 spin_unlock(&clp->cl_lock);
252
253out:
254 return cred;
255}
256
257static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
258{
259 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
260 spin_lock(&tbl->slot_tbl_lock);
261 nfs41_wake_slot_table(tbl);
262 spin_unlock(&tbl->slot_tbl_lock);
263 }
264}
265
266static void nfs4_end_drain_session(struct nfs_client *clp)
267{
268 struct nfs4_session *ses = clp->cl_session;
269
270 if (clp->cl_slot_tbl) {
271 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
272 return;
273 }
274
275 if (ses != NULL) {
276 nfs4_end_drain_slot_table(&ses->bc_slot_table);
277 nfs4_end_drain_slot_table(&ses->fc_slot_table);
278 }
279}
280
281static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
282{
283 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
284 spin_lock(&tbl->slot_tbl_lock);
285 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
286 reinit_completion(&tbl->complete);
287 spin_unlock(&tbl->slot_tbl_lock);
288 return wait_for_completion_interruptible(&tbl->complete);
289 }
290 spin_unlock(&tbl->slot_tbl_lock);
291 return 0;
292}
293
294static int nfs4_begin_drain_session(struct nfs_client *clp)
295{
296 struct nfs4_session *ses = clp->cl_session;
297 int ret;
298
299 if (clp->cl_slot_tbl)
300 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
301
302 /* back channel */
303 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
304 if (ret)
305 return ret;
306 /* fore channel */
307 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
308}
309
310#if defined(CONFIG_NFS_V4_1)
311
312static void nfs41_finish_session_reset(struct nfs_client *clp)
313{
314 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
315 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
316 /* create_session negotiated new slot table */
317 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
318 nfs4_setup_state_renewal(clp);
319}
320
321int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
322{
323 int status;
324
325 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
326 goto do_confirm;
327 status = nfs4_proc_exchange_id(clp, cred);
328 if (status != 0)
329 goto out;
330 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
331do_confirm:
332 status = nfs4_proc_create_session(clp, cred);
333 if (status != 0)
334 goto out;
335 if (!(clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R))
336 nfs4_state_start_reclaim_reboot(clp);
337 nfs41_finish_session_reset(clp);
338 nfs_mark_client_ready(clp, NFS_CS_READY);
339out:
340 return status;
341}
342
343/**
344 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
345 *
346 * @clp: nfs_client under test
347 * @result: OUT: found nfs_client, or clp
348 * @cred: credential to use for trunking test
349 *
350 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
351 * If NFS4_OK is returned, an nfs_client pointer is planted in
352 * "result".
353 *
354 * Note: The returned client may not yet be marked ready.
355 */
356int nfs41_discover_server_trunking(struct nfs_client *clp,
357 struct nfs_client **result,
358 const struct cred *cred)
359{
360 int status;
361
362 status = nfs4_proc_exchange_id(clp, cred);
363 if (status != NFS4_OK)
364 return status;
365
366 status = nfs41_walk_client_list(clp, result, cred);
367 if (status < 0)
368 return status;
369 if (clp != *result)
370 return 0;
371
372 /*
373 * Purge state if the client id was established in a prior
374 * instance and the client id could not have arrived on the
375 * server via Transparent State Migration.
376 */
377 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
378 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
379 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
380 else
381 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
382 }
383 nfs4_schedule_state_manager(clp);
384 status = nfs_wait_client_init_complete(clp);
385 if (status < 0)
386 nfs_put_client(clp);
387 return status;
388}
389
390#endif /* CONFIG_NFS_V4_1 */
391
392/**
393 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
394 * @clp: client state handle
395 *
396 * Returns a cred with reference count bumped, or NULL.
397 */
398const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
399{
400 const struct cred *cred;
401
402 cred = nfs4_get_machine_cred(clp);
403 return cred;
404}
405
406static struct nfs4_state_owner *
407nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
408{
409 struct rb_node **p = &server->state_owners.rb_node,
410 *parent = NULL;
411 struct nfs4_state_owner *sp;
412 int cmp;
413
414 while (*p != NULL) {
415 parent = *p;
416 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
417 cmp = cred_fscmp(cred, sp->so_cred);
418
419 if (cmp < 0)
420 p = &parent->rb_left;
421 else if (cmp > 0)
422 p = &parent->rb_right;
423 else {
424 if (!list_empty(&sp->so_lru))
425 list_del_init(&sp->so_lru);
426 atomic_inc(&sp->so_count);
427 return sp;
428 }
429 }
430 return NULL;
431}
432
433static struct nfs4_state_owner *
434nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
435{
436 struct nfs_server *server = new->so_server;
437 struct rb_node **p = &server->state_owners.rb_node,
438 *parent = NULL;
439 struct nfs4_state_owner *sp;
440 int cmp;
441
442 while (*p != NULL) {
443 parent = *p;
444 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
445 cmp = cred_fscmp(new->so_cred, sp->so_cred);
446
447 if (cmp < 0)
448 p = &parent->rb_left;
449 else if (cmp > 0)
450 p = &parent->rb_right;
451 else {
452 if (!list_empty(&sp->so_lru))
453 list_del_init(&sp->so_lru);
454 atomic_inc(&sp->so_count);
455 return sp;
456 }
457 }
458 rb_link_node(&new->so_server_node, parent, p);
459 rb_insert_color(&new->so_server_node, &server->state_owners);
460 return new;
461}
462
463static void
464nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
465{
466 struct nfs_server *server = sp->so_server;
467
468 if (!RB_EMPTY_NODE(&sp->so_server_node))
469 rb_erase(&sp->so_server_node, &server->state_owners);
470}
471
472static void
473nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
474{
475 sc->create_time = ktime_get();
476 sc->flags = 0;
477 sc->counter = 0;
478 spin_lock_init(&sc->lock);
479 INIT_LIST_HEAD(&sc->list);
480 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
481}
482
483static void
484nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
485{
486 rpc_destroy_wait_queue(&sc->wait);
487}
488
489/*
490 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
491 * create a new state_owner.
492 *
493 */
494static struct nfs4_state_owner *
495nfs4_alloc_state_owner(struct nfs_server *server,
496 const struct cred *cred,
497 gfp_t gfp_flags)
498{
499 struct nfs4_state_owner *sp;
500
501 sp = kzalloc(sizeof(*sp), gfp_flags);
502 if (!sp)
503 return NULL;
504 sp->so_seqid.owner_id = atomic64_inc_return(&server->owner_ctr);
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 mutex_init(&sp->so_delegreturn_mutex);
513 return sp;
514}
515
516static void
517nfs4_reset_state_owner(struct nfs4_state_owner *sp)
518{
519 /* This state_owner is no longer usable, but must
520 * remain in place so that state recovery can find it
521 * and the opens associated with it.
522 * It may also be used for new 'open' request to
523 * return a delegation to the server.
524 * So update the 'create_time' so that it looks like
525 * a new state_owner. This will cause the server to
526 * request an OPEN_CONFIRM to start a new sequence.
527 */
528 sp->so_seqid.create_time = ktime_get();
529}
530
531static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
532{
533 nfs4_destroy_seqid_counter(&sp->so_seqid);
534 put_cred(sp->so_cred);
535 kfree(sp);
536}
537
538static void nfs4_gc_state_owners(struct nfs_server *server)
539{
540 struct nfs_client *clp = server->nfs_client;
541 struct nfs4_state_owner *sp, *tmp;
542 unsigned long time_min, time_max;
543 LIST_HEAD(doomed);
544
545 spin_lock(&clp->cl_lock);
546 time_max = jiffies;
547 time_min = (long)time_max - (long)clp->cl_lease_time;
548 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
549 /* NB: LRU is sorted so that oldest is at the head */
550 if (time_in_range(sp->so_expires, time_min, time_max))
551 break;
552 list_move(&sp->so_lru, &doomed);
553 nfs4_remove_state_owner_locked(sp);
554 }
555 spin_unlock(&clp->cl_lock);
556
557 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
558 list_del(&sp->so_lru);
559 nfs4_free_state_owner(sp);
560 }
561}
562
563/**
564 * nfs4_get_state_owner - Look up a state owner given a credential
565 * @server: nfs_server to search
566 * @cred: RPC credential to match
567 * @gfp_flags: allocation mode
568 *
569 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
570 */
571struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
572 const struct cred *cred,
573 gfp_t gfp_flags)
574{
575 struct nfs_client *clp = server->nfs_client;
576 struct nfs4_state_owner *sp, *new;
577
578 spin_lock(&clp->cl_lock);
579 sp = nfs4_find_state_owner_locked(server, cred);
580 spin_unlock(&clp->cl_lock);
581 if (sp != NULL)
582 goto out;
583 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
584 if (new == NULL)
585 goto out;
586 spin_lock(&clp->cl_lock);
587 sp = nfs4_insert_state_owner_locked(new);
588 spin_unlock(&clp->cl_lock);
589 if (sp != new)
590 nfs4_free_state_owner(new);
591out:
592 nfs4_gc_state_owners(server);
593 return sp;
594}
595
596/**
597 * nfs4_put_state_owner - Release a nfs4_state_owner
598 * @sp: state owner data to release
599 *
600 * Note that we keep released state owners on an LRU
601 * list.
602 * This caches valid state owners so that they can be
603 * reused, to avoid the OPEN_CONFIRM on minor version 0.
604 * It also pins the uniquifier of dropped state owners for
605 * a while, to ensure that those state owner names are
606 * never reused.
607 */
608void nfs4_put_state_owner(struct nfs4_state_owner *sp)
609{
610 struct nfs_server *server = sp->so_server;
611 struct nfs_client *clp = server->nfs_client;
612
613 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
614 return;
615
616 sp->so_expires = jiffies;
617 list_add_tail(&sp->so_lru, &server->state_owners_lru);
618 spin_unlock(&clp->cl_lock);
619}
620
621/**
622 * nfs4_purge_state_owners - Release all cached state owners
623 * @server: nfs_server with cached state owners to release
624 * @head: resulting list of state owners
625 *
626 * Called at umount time. Remaining state owners will be on
627 * the LRU with ref count of zero.
628 * Note that the state owners are not freed, but are added
629 * to the list @head, which can later be used as an argument
630 * to nfs4_free_state_owners.
631 */
632void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
633{
634 struct nfs_client *clp = server->nfs_client;
635 struct nfs4_state_owner *sp, *tmp;
636
637 spin_lock(&clp->cl_lock);
638 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
639 list_move(&sp->so_lru, head);
640 nfs4_remove_state_owner_locked(sp);
641 }
642 spin_unlock(&clp->cl_lock);
643}
644
645/**
646 * nfs4_free_state_owners - Release all cached state owners
647 * @head: resulting list of state owners
648 *
649 * Frees a list of state owners that was generated by
650 * nfs4_purge_state_owners
651 */
652void nfs4_free_state_owners(struct list_head *head)
653{
654 struct nfs4_state_owner *sp, *tmp;
655
656 list_for_each_entry_safe(sp, tmp, head, so_lru) {
657 list_del(&sp->so_lru);
658 nfs4_free_state_owner(sp);
659 }
660}
661
662static struct nfs4_state *
663nfs4_alloc_open_state(void)
664{
665 struct nfs4_state *state;
666
667 state = kzalloc(sizeof(*state), GFP_KERNEL_ACCOUNT);
668 if (!state)
669 return NULL;
670 refcount_set(&state->count, 1);
671 INIT_LIST_HEAD(&state->lock_states);
672 spin_lock_init(&state->state_lock);
673 seqlock_init(&state->seqlock);
674 init_waitqueue_head(&state->waitq);
675 return state;
676}
677
678void
679nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
680{
681 if (state->state == fmode)
682 return;
683 /* NB! List reordering - see the reclaim code for why. */
684 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
685 if (fmode & FMODE_WRITE)
686 list_move(&state->open_states, &state->owner->so_states);
687 else
688 list_move_tail(&state->open_states, &state->owner->so_states);
689 }
690 state->state = fmode;
691}
692
693static struct nfs4_state *
694__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
695{
696 struct nfs_inode *nfsi = NFS_I(inode);
697 struct nfs4_state *state;
698
699 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
700 if (state->owner != owner)
701 continue;
702 if (!nfs4_valid_open_stateid(state))
703 continue;
704 if (refcount_inc_not_zero(&state->count))
705 return state;
706 }
707 return NULL;
708}
709
710static void
711nfs4_free_open_state(struct nfs4_state *state)
712{
713 kfree_rcu(state, rcu_head);
714}
715
716struct nfs4_state *
717nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
718{
719 struct nfs4_state *state, *new;
720 struct nfs_inode *nfsi = NFS_I(inode);
721
722 rcu_read_lock();
723 state = __nfs4_find_state_byowner(inode, owner);
724 rcu_read_unlock();
725 if (state)
726 goto out;
727 new = nfs4_alloc_open_state();
728 spin_lock(&owner->so_lock);
729 spin_lock(&inode->i_lock);
730 state = __nfs4_find_state_byowner(inode, owner);
731 if (state == NULL && new != NULL) {
732 state = new;
733 state->owner = owner;
734 atomic_inc(&owner->so_count);
735 ihold(inode);
736 state->inode = inode;
737 list_add_rcu(&state->inode_states, &nfsi->open_states);
738 spin_unlock(&inode->i_lock);
739 /* Note: The reclaim code dictates that we add stateless
740 * and read-only stateids to the end of the list */
741 list_add_tail(&state->open_states, &owner->so_states);
742 spin_unlock(&owner->so_lock);
743 } else {
744 spin_unlock(&inode->i_lock);
745 spin_unlock(&owner->so_lock);
746 if (new)
747 nfs4_free_open_state(new);
748 }
749out:
750 return state;
751}
752
753void nfs4_put_open_state(struct nfs4_state *state)
754{
755 struct inode *inode = state->inode;
756 struct nfs4_state_owner *owner = state->owner;
757
758 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
759 return;
760 spin_lock(&inode->i_lock);
761 list_del_rcu(&state->inode_states);
762 list_del(&state->open_states);
763 spin_unlock(&inode->i_lock);
764 spin_unlock(&owner->so_lock);
765 nfs4_inode_return_delegation_on_close(inode);
766 iput(inode);
767 nfs4_free_open_state(state);
768 nfs4_put_state_owner(owner);
769}
770
771/*
772 * Close the current file.
773 */
774static void __nfs4_close(struct nfs4_state *state,
775 fmode_t fmode, gfp_t gfp_mask, int wait)
776{
777 struct nfs4_state_owner *owner = state->owner;
778 int call_close = 0;
779 fmode_t newstate;
780
781 atomic_inc(&owner->so_count);
782 /* Protect against nfs4_find_state() */
783 spin_lock(&owner->so_lock);
784 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
785 case FMODE_READ:
786 state->n_rdonly--;
787 break;
788 case FMODE_WRITE:
789 state->n_wronly--;
790 break;
791 case FMODE_READ|FMODE_WRITE:
792 state->n_rdwr--;
793 }
794 newstate = FMODE_READ|FMODE_WRITE;
795 if (state->n_rdwr == 0) {
796 if (state->n_rdonly == 0) {
797 newstate &= ~FMODE_READ;
798 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
799 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
800 }
801 if (state->n_wronly == 0) {
802 newstate &= ~FMODE_WRITE;
803 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
804 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
805 }
806 if (newstate == 0)
807 clear_bit(NFS_DELEGATED_STATE, &state->flags);
808 }
809 nfs4_state_set_mode_locked(state, newstate);
810 spin_unlock(&owner->so_lock);
811
812 if (!call_close) {
813 nfs4_put_open_state(state);
814 nfs4_put_state_owner(owner);
815 } else
816 nfs4_do_close(state, gfp_mask, wait);
817}
818
819void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
820{
821 __nfs4_close(state, fmode, GFP_KERNEL, 0);
822}
823
824void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
825{
826 __nfs4_close(state, fmode, GFP_KERNEL, 1);
827}
828
829/*
830 * Search the state->lock_states for an existing lock_owner
831 * that is compatible with either of the given owners.
832 * If the second is non-zero, then the first refers to a Posix-lock
833 * owner (current->files) and the second refers to a flock/OFD
834 * owner (struct file*). In that case, prefer a match for the first
835 * owner.
836 * If both sorts of locks are held on the one file we cannot know
837 * which stateid was intended to be used, so a "correct" choice cannot
838 * be made. Failing that, a "consistent" choice is preferable. The
839 * consistent choice we make is to prefer the first owner, that of a
840 * Posix lock.
841 */
842static struct nfs4_lock_state *
843__nfs4_find_lock_state(struct nfs4_state *state,
844 fl_owner_t owner, fl_owner_t owner2)
845{
846 struct nfs4_lock_state *pos, *ret = NULL;
847 list_for_each_entry(pos, &state->lock_states, ls_locks) {
848 if (pos->ls_owner == owner) {
849 ret = pos;
850 break;
851 }
852 if (pos->ls_owner == owner2)
853 ret = pos;
854 }
855 if (ret)
856 refcount_inc(&ret->ls_count);
857 return ret;
858}
859
860/*
861 * Return a compatible lock_state. If no initialized lock_state structure
862 * exists, return an uninitialized one.
863 *
864 */
865static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t owner)
866{
867 struct nfs4_lock_state *lsp;
868 struct nfs_server *server = state->owner->so_server;
869
870 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL_ACCOUNT);
871 if (lsp == NULL)
872 return NULL;
873 nfs4_init_seqid_counter(&lsp->ls_seqid);
874 refcount_set(&lsp->ls_count, 1);
875 lsp->ls_state = state;
876 lsp->ls_owner = owner;
877 lsp->ls_seqid.owner_id = atomic64_inc_return(&server->owner_ctr);
878 INIT_LIST_HEAD(&lsp->ls_locks);
879 return lsp;
880}
881
882void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
883{
884 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
885 kfree(lsp);
886}
887
888/*
889 * Return a compatible lock_state. If no initialized lock_state structure
890 * exists, return an uninitialized one.
891 *
892 */
893static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
894{
895 struct nfs4_lock_state *lsp, *new = NULL;
896
897 for(;;) {
898 spin_lock(&state->state_lock);
899 lsp = __nfs4_find_lock_state(state, owner, NULL);
900 if (lsp != NULL)
901 break;
902 if (new != NULL) {
903 list_add(&new->ls_locks, &state->lock_states);
904 set_bit(LK_STATE_IN_USE, &state->flags);
905 lsp = new;
906 new = NULL;
907 break;
908 }
909 spin_unlock(&state->state_lock);
910 new = nfs4_alloc_lock_state(state, owner);
911 if (new == NULL)
912 return NULL;
913 }
914 spin_unlock(&state->state_lock);
915 if (new != NULL)
916 nfs4_free_lock_state(state->owner->so_server, new);
917 return lsp;
918}
919
920/*
921 * Release reference to lock_state, and free it if we see that
922 * it is no longer in use
923 */
924void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
925{
926 struct nfs_server *server;
927 struct nfs4_state *state;
928
929 if (lsp == NULL)
930 return;
931 state = lsp->ls_state;
932 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
933 return;
934 list_del(&lsp->ls_locks);
935 if (list_empty(&state->lock_states))
936 clear_bit(LK_STATE_IN_USE, &state->flags);
937 spin_unlock(&state->state_lock);
938 server = state->owner->so_server;
939 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
940 struct nfs_client *clp = server->nfs_client;
941
942 clp->cl_mvops->free_lock_state(server, lsp);
943 } else
944 nfs4_free_lock_state(server, lsp);
945}
946
947static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
948{
949 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
950
951 dst->fl_u.nfs4_fl.owner = lsp;
952 refcount_inc(&lsp->ls_count);
953}
954
955static void nfs4_fl_release_lock(struct file_lock *fl)
956{
957 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
958}
959
960static const struct file_lock_operations nfs4_fl_lock_ops = {
961 .fl_copy_lock = nfs4_fl_copy_lock,
962 .fl_release_private = nfs4_fl_release_lock,
963};
964
965int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
966{
967 struct nfs4_lock_state *lsp;
968
969 if (fl->fl_ops != NULL)
970 return 0;
971 lsp = nfs4_get_lock_state(state, fl->c.flc_owner);
972 if (lsp == NULL)
973 return -ENOMEM;
974 fl->fl_u.nfs4_fl.owner = lsp;
975 fl->fl_ops = &nfs4_fl_lock_ops;
976 return 0;
977}
978
979static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
980 struct nfs4_state *state,
981 const struct nfs_lock_context *l_ctx)
982{
983 struct nfs4_lock_state *lsp;
984 fl_owner_t owner, fl_flock_owner;
985 int ret = -ENOENT;
986
987 if (l_ctx == NULL)
988 goto out;
989
990 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
991 goto out;
992
993 owner = l_ctx->lockowner;
994 fl_flock_owner = l_ctx->open_context->flock_owner;
995
996 spin_lock(&state->state_lock);
997 lsp = __nfs4_find_lock_state(state, owner, fl_flock_owner);
998 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
999 ret = -EIO;
1000 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1001 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1002 ret = 0;
1003 }
1004 spin_unlock(&state->state_lock);
1005 nfs4_put_lock_state(lsp);
1006out:
1007 return ret;
1008}
1009
1010bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1011{
1012 bool ret;
1013 const nfs4_stateid *src;
1014 int seq;
1015
1016 do {
1017 ret = false;
1018 src = &zero_stateid;
1019 seq = read_seqbegin(&state->seqlock);
1020 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1021 src = &state->open_stateid;
1022 ret = true;
1023 }
1024 nfs4_stateid_copy(dst, src);
1025 } while (read_seqretry(&state->seqlock, seq));
1026 return ret;
1027}
1028
1029/*
1030 * Byte-range lock aware utility to initialize the stateid of read/write
1031 * requests.
1032 */
1033int nfs4_select_rw_stateid(struct nfs4_state *state,
1034 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1035 nfs4_stateid *dst, const struct cred **cred)
1036{
1037 int ret;
1038
1039 if (!nfs4_valid_open_stateid(state))
1040 return -EIO;
1041 if (cred != NULL)
1042 *cred = NULL;
1043 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1044 if (ret == -EIO)
1045 /* A lost lock - don't even consider delegations */
1046 goto out;
1047 /* returns true if delegation stateid found and copied */
1048 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1049 ret = 0;
1050 goto out;
1051 }
1052 if (ret != -ENOENT)
1053 /* nfs4_copy_delegation_stateid() didn't over-write
1054 * dst, so it still has the lock stateid which we now
1055 * choose to use.
1056 */
1057 goto out;
1058 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1059out:
1060 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1061 dst->seqid = 0;
1062 return ret;
1063}
1064
1065struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1066{
1067 struct nfs_seqid *new;
1068
1069 new = kmalloc(sizeof(*new), gfp_mask);
1070 if (new == NULL)
1071 return ERR_PTR(-ENOMEM);
1072 new->sequence = counter;
1073 INIT_LIST_HEAD(&new->list);
1074 new->task = NULL;
1075 return new;
1076}
1077
1078void nfs_release_seqid(struct nfs_seqid *seqid)
1079{
1080 struct nfs_seqid_counter *sequence;
1081
1082 if (seqid == NULL || list_empty(&seqid->list))
1083 return;
1084 sequence = seqid->sequence;
1085 spin_lock(&sequence->lock);
1086 if (list_is_first(&seqid->list, &sequence->list) &&
1087 !list_is_singular(&sequence->list)) {
1088 struct nfs_seqid *next = list_next_entry(seqid, list);
1089 rpc_wake_up_queued_task(&sequence->wait, next->task);
1090 }
1091 list_del_init(&seqid->list);
1092 spin_unlock(&sequence->lock);
1093}
1094
1095void nfs_free_seqid(struct nfs_seqid *seqid)
1096{
1097 nfs_release_seqid(seqid);
1098 kfree(seqid);
1099}
1100
1101/*
1102 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1103 * failed with a seqid incrementing error -
1104 * see comments nfs4.h:seqid_mutating_error()
1105 */
1106static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1107{
1108 switch (status) {
1109 case 0:
1110 break;
1111 case -NFS4ERR_BAD_SEQID:
1112 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1113 return;
1114 pr_warn_ratelimited("NFS: v4 server returned a bad"
1115 " sequence-id error on an"
1116 " unconfirmed sequence %p!\n",
1117 seqid->sequence);
1118 return;
1119 case -NFS4ERR_STALE_CLIENTID:
1120 case -NFS4ERR_STALE_STATEID:
1121 case -NFS4ERR_BAD_STATEID:
1122 case -NFS4ERR_BADXDR:
1123 case -NFS4ERR_RESOURCE:
1124 case -NFS4ERR_NOFILEHANDLE:
1125 case -NFS4ERR_MOVED:
1126 /* Non-seqid mutating errors */
1127 return;
1128 }
1129 /*
1130 * Note: no locking needed as we are guaranteed to be first
1131 * on the sequence list
1132 */
1133 seqid->sequence->counter++;
1134}
1135
1136void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1137{
1138 struct nfs4_state_owner *sp;
1139
1140 if (seqid == NULL)
1141 return;
1142
1143 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1144 if (status == -NFS4ERR_BAD_SEQID)
1145 nfs4_reset_state_owner(sp);
1146 if (!nfs4_has_session(sp->so_server->nfs_client))
1147 nfs_increment_seqid(status, seqid);
1148}
1149
1150/*
1151 * Increment the seqid if the LOCK/LOCKU succeeded, or
1152 * failed with a seqid incrementing error -
1153 * see comments nfs4.h:seqid_mutating_error()
1154 */
1155void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1156{
1157 if (seqid != NULL)
1158 nfs_increment_seqid(status, seqid);
1159}
1160
1161int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1162{
1163 struct nfs_seqid_counter *sequence;
1164 int status = 0;
1165
1166 if (seqid == NULL)
1167 goto out;
1168 sequence = seqid->sequence;
1169 spin_lock(&sequence->lock);
1170 seqid->task = task;
1171 if (list_empty(&seqid->list))
1172 list_add_tail(&seqid->list, &sequence->list);
1173 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1174 goto unlock;
1175 rpc_sleep_on(&sequence->wait, task, NULL);
1176 status = -EAGAIN;
1177unlock:
1178 spin_unlock(&sequence->lock);
1179out:
1180 return status;
1181}
1182
1183static int nfs4_run_state_manager(void *);
1184
1185static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1186{
1187 clear_and_wake_up_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1188 rpc_wake_up(&clp->cl_rpcwaitq);
1189}
1190
1191/*
1192 * Schedule the nfs_client asynchronous state management routine
1193 */
1194void nfs4_schedule_state_manager(struct nfs_client *clp)
1195{
1196 struct task_struct *task;
1197 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1198 struct rpc_clnt *clnt = clp->cl_rpcclient;
1199 bool swapon = false;
1200
1201 if (clnt->cl_shutdown)
1202 return;
1203
1204 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1205
1206 if (atomic_read(&clnt->cl_swapper)) {
1207 swapon = !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE,
1208 &clp->cl_state);
1209 if (!swapon) {
1210 wake_up_var(&clp->cl_state);
1211 return;
1212 }
1213 }
1214
1215 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1216 return;
1217
1218 __module_get(THIS_MODULE);
1219 refcount_inc(&clp->cl_count);
1220
1221 /* The rcu_read_lock() is not strictly necessary, as the state
1222 * manager is the only thread that ever changes the rpc_xprt
1223 * after it's initialized. At this point, we're single threaded. */
1224 rcu_read_lock();
1225 snprintf(buf, sizeof(buf), "%s-manager",
1226 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1227 rcu_read_unlock();
1228 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1229 if (IS_ERR(task)) {
1230 printk(KERN_ERR "%s: kthread_run: %ld\n",
1231 __func__, PTR_ERR(task));
1232 if (!nfs_client_init_is_complete(clp))
1233 nfs_mark_client_ready(clp, PTR_ERR(task));
1234 if (swapon)
1235 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
1236 nfs4_clear_state_manager_bit(clp);
1237 nfs_put_client(clp);
1238 module_put(THIS_MODULE);
1239 }
1240}
1241
1242/*
1243 * Schedule a lease recovery attempt
1244 */
1245void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1246{
1247 if (!clp)
1248 return;
1249 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1250 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1251 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1252 clp->cl_hostname);
1253 nfs4_schedule_state_manager(clp);
1254}
1255EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1256
1257/**
1258 * nfs4_schedule_migration_recovery - trigger migration recovery
1259 *
1260 * @server: FSID that is migrating
1261 *
1262 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1263 * value is returned.
1264 */
1265int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1266{
1267 struct nfs_client *clp = server->nfs_client;
1268
1269 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1270 pr_err("NFS: volatile file handles not supported (server %s)\n",
1271 clp->cl_hostname);
1272 return -NFS4ERR_IO;
1273 }
1274
1275 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1276 return -NFS4ERR_IO;
1277
1278 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1279 __func__,
1280 (unsigned long long)server->fsid.major,
1281 (unsigned long long)server->fsid.minor,
1282 clp->cl_hostname);
1283
1284 set_bit(NFS_MIG_IN_TRANSITION,
1285 &((struct nfs_server *)server)->mig_status);
1286 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1287
1288 nfs4_schedule_state_manager(clp);
1289 return 0;
1290}
1291EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1292
1293/**
1294 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1295 *
1296 * @clp: server to check for moved leases
1297 *
1298 */
1299void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1300{
1301 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1302 __func__, clp->cl_clientid, clp->cl_hostname);
1303
1304 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1305 nfs4_schedule_state_manager(clp);
1306}
1307EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1308
1309int nfs4_wait_clnt_recover(struct nfs_client *clp)
1310{
1311 int res;
1312
1313 might_sleep();
1314
1315 refcount_inc(&clp->cl_count);
1316 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1317 nfs_wait_bit_killable,
1318 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1319 if (res)
1320 goto out;
1321 if (clp->cl_cons_state < 0)
1322 res = clp->cl_cons_state;
1323out:
1324 nfs_put_client(clp);
1325 return res;
1326}
1327
1328int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1329{
1330 unsigned int loop;
1331 int ret;
1332
1333 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1334 ret = nfs4_wait_clnt_recover(clp);
1335 if (ret != 0)
1336 break;
1337 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1338 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1339 break;
1340 nfs4_schedule_state_manager(clp);
1341 ret = -EIO;
1342 }
1343 return ret;
1344}
1345
1346/*
1347 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1348 * @clp: client to process
1349 *
1350 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1351 * resend of the SETCLIENTID and hence re-establish the
1352 * callback channel. Then return all existing delegations.
1353 */
1354static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1355{
1356 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1357 nfs_expire_all_delegations(clp);
1358 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1359 clp->cl_hostname);
1360}
1361
1362void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1363{
1364 nfs40_handle_cb_pathdown(clp);
1365 nfs4_schedule_state_manager(clp);
1366}
1367
1368static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1369{
1370
1371 if (!nfs4_valid_open_stateid(state))
1372 return 0;
1373 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1374 /* Don't recover state that expired before the reboot */
1375 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1376 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1377 return 0;
1378 }
1379 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1380 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1381 return 1;
1382}
1383
1384int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1385{
1386 if (!nfs4_valid_open_stateid(state))
1387 return 0;
1388 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1389 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1390 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1391 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1392 return 1;
1393}
1394
1395int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1396{
1397 struct nfs_client *clp = server->nfs_client;
1398
1399 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1400 return -EBADF;
1401 nfs_inode_find_delegation_state_and_recover(state->inode,
1402 &state->stateid);
1403 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1404 clp->cl_hostname);
1405 nfs4_schedule_state_manager(clp);
1406 return 0;
1407}
1408EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1409
1410static struct nfs4_lock_state *
1411nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1412 const nfs4_stateid *stateid)
1413{
1414 struct nfs4_lock_state *pos;
1415
1416 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1417 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1418 continue;
1419 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
1420 return pos;
1421 }
1422 return NULL;
1423}
1424
1425static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1426 const nfs4_stateid *stateid)
1427{
1428 bool found = false;
1429
1430 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1431 spin_lock(&state->state_lock);
1432 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1433 found = true;
1434 spin_unlock(&state->state_lock);
1435 }
1436 return found;
1437}
1438
1439void nfs_inode_find_state_and_recover(struct inode *inode,
1440 const nfs4_stateid *stateid)
1441{
1442 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1443 struct nfs_inode *nfsi = NFS_I(inode);
1444 struct nfs_open_context *ctx;
1445 struct nfs4_state *state;
1446 bool found = false;
1447
1448 rcu_read_lock();
1449 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1450 state = ctx->state;
1451 if (state == NULL)
1452 continue;
1453 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
1454 nfs4_state_mark_reclaim_nograce(clp, state)) {
1455 found = true;
1456 continue;
1457 }
1458 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1459 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
1460 nfs4_state_mark_reclaim_nograce(clp, state)) {
1461 found = true;
1462 continue;
1463 }
1464 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1465 nfs4_state_mark_reclaim_nograce(clp, state))
1466 found = true;
1467 }
1468 rcu_read_unlock();
1469
1470 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1471 if (found)
1472 nfs4_schedule_state_manager(clp);
1473}
1474
1475static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1476{
1477 struct inode *inode = state->inode;
1478 struct nfs_inode *nfsi = NFS_I(inode);
1479 struct nfs_open_context *ctx;
1480
1481 rcu_read_lock();
1482 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1483 if (ctx->state != state)
1484 continue;
1485 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1486 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1487 "error = %d\n", ctx->dentry, err);
1488 }
1489 rcu_read_unlock();
1490}
1491
1492static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1493{
1494 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1495 nfs4_state_mark_open_context_bad(state, error);
1496}
1497
1498
1499static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1500{
1501 struct inode *inode = state->inode;
1502 struct nfs_inode *nfsi = NFS_I(inode);
1503 struct file_lock *fl;
1504 struct nfs4_lock_state *lsp;
1505 int status = 0;
1506 struct file_lock_context *flctx = locks_inode_context(inode);
1507 struct list_head *list;
1508
1509 if (flctx == NULL)
1510 return 0;
1511
1512 list = &flctx->flc_posix;
1513
1514 /* Guard against delegation returns and new lock/unlock calls */
1515 down_write(&nfsi->rwsem);
1516 spin_lock(&flctx->flc_lock);
1517restart:
1518 for_each_file_lock(fl, list) {
1519 if (nfs_file_open_context(fl->c.flc_file)->state != state)
1520 continue;
1521 spin_unlock(&flctx->flc_lock);
1522 status = ops->recover_lock(state, fl);
1523 switch (status) {
1524 case 0:
1525 break;
1526 case -ETIMEDOUT:
1527 case -ESTALE:
1528 case -NFS4ERR_ADMIN_REVOKED:
1529 case -NFS4ERR_STALE_STATEID:
1530 case -NFS4ERR_BAD_STATEID:
1531 case -NFS4ERR_EXPIRED:
1532 case -NFS4ERR_NO_GRACE:
1533 case -NFS4ERR_STALE_CLIENTID:
1534 case -NFS4ERR_BADSESSION:
1535 case -NFS4ERR_BADSLOT:
1536 case -NFS4ERR_BAD_HIGH_SLOT:
1537 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1538 goto out;
1539 default:
1540 pr_err("NFS: %s: unhandled error %d\n",
1541 __func__, status);
1542 fallthrough;
1543 case -ENOMEM:
1544 case -NFS4ERR_DENIED:
1545 case -NFS4ERR_RECLAIM_BAD:
1546 case -NFS4ERR_RECLAIM_CONFLICT:
1547 lsp = fl->fl_u.nfs4_fl.owner;
1548 if (lsp)
1549 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1550 status = 0;
1551 }
1552 spin_lock(&flctx->flc_lock);
1553 }
1554 if (list == &flctx->flc_posix) {
1555 list = &flctx->flc_flock;
1556 goto restart;
1557 }
1558 spin_unlock(&flctx->flc_lock);
1559out:
1560 up_write(&nfsi->rwsem);
1561 return status;
1562}
1563
1564#ifdef CONFIG_NFS_V4_2
1565static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1566{
1567 struct nfs4_copy_state *copy;
1568
1569 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1570 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
1571 return;
1572
1573 spin_lock(&sp->so_server->nfs_client->cl_lock);
1574 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1575 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1576 !nfs4_stateid_match_other(&state->stateid,
1577 ©->parent_dst_state->stateid)))
1578 continue;
1579 copy->flags = 1;
1580 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1581 &state->flags)) {
1582 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1583 complete(©->completion);
1584 }
1585 }
1586 list_for_each_entry(copy, &sp->so_server->ss_src_copies, src_copies) {
1587 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1588 !nfs4_stateid_match_other(&state->stateid,
1589 ©->parent_src_state->stateid)))
1590 continue;
1591 copy->flags = 1;
1592 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1593 &state->flags))
1594 complete(©->completion);
1595 }
1596 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1597}
1598#else /* !CONFIG_NFS_V4_2 */
1599static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1600 struct nfs4_state *state)
1601{
1602}
1603#endif /* CONFIG_NFS_V4_2 */
1604
1605static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1606 const struct nfs4_state_recovery_ops *ops,
1607 int *lost_locks)
1608{
1609 struct nfs4_lock_state *lock;
1610 int status;
1611
1612 status = ops->recover_open(sp, state);
1613 if (status < 0)
1614 return status;
1615
1616 status = nfs4_reclaim_locks(state, ops);
1617 if (status < 0)
1618 return status;
1619
1620 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1621 spin_lock(&state->state_lock);
1622 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1623 trace_nfs4_state_lock_reclaim(state, lock);
1624 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags) &&
1625 !test_bit(NFS_LOCK_UNLOCKING, &lock->ls_flags))
1626 *lost_locks += 1;
1627 }
1628 spin_unlock(&state->state_lock);
1629 }
1630
1631 nfs42_complete_copies(sp, state);
1632 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1633 return status;
1634}
1635
1636static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp,
1637 const struct nfs4_state_recovery_ops *ops,
1638 int *lost_locks)
1639{
1640 struct nfs4_state *state;
1641 unsigned int loop = 0;
1642 int status = 0;
1643#ifdef CONFIG_NFS_V4_2
1644 bool found_ssc_copy_state = false;
1645#endif /* CONFIG_NFS_V4_2 */
1646
1647 /* Note: we rely on the sp->so_states list being ordered
1648 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1649 * states first.
1650 * This is needed to ensure that the server won't give us any
1651 * read delegations that we have to return if, say, we are
1652 * recovering after a network partition or a reboot from a
1653 * server that doesn't support a grace period.
1654 */
1655 spin_lock(&sp->so_lock);
1656restart:
1657 list_for_each_entry(state, &sp->so_states, open_states) {
1658 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1659 continue;
1660 if (!nfs4_valid_open_stateid(state))
1661 continue;
1662 if (state->state == 0)
1663 continue;
1664#ifdef CONFIG_NFS_V4_2
1665 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1666 nfs4_state_mark_recovery_failed(state, -EIO);
1667 found_ssc_copy_state = true;
1668 continue;
1669 }
1670#endif /* CONFIG_NFS_V4_2 */
1671 refcount_inc(&state->count);
1672 spin_unlock(&sp->so_lock);
1673 status = __nfs4_reclaim_open_state(sp, state, ops, lost_locks);
1674
1675 switch (status) {
1676 default:
1677 if (status >= 0) {
1678 loop = 0;
1679 break;
1680 }
1681 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1682 fallthrough;
1683 case -ENOENT:
1684 case -ENOMEM:
1685 case -EACCES:
1686 case -EROFS:
1687 case -EIO:
1688 case -ESTALE:
1689 /* Open state on this file cannot be recovered */
1690 nfs4_state_mark_recovery_failed(state, status);
1691 break;
1692 case -EAGAIN:
1693 ssleep(1);
1694 if (loop++ < 10) {
1695 set_bit(ops->state_flag_bit, &state->flags);
1696 break;
1697 }
1698 fallthrough;
1699 case -NFS4ERR_ADMIN_REVOKED:
1700 case -NFS4ERR_STALE_STATEID:
1701 case -NFS4ERR_OLD_STATEID:
1702 case -NFS4ERR_BAD_STATEID:
1703 case -NFS4ERR_RECLAIM_BAD:
1704 case -NFS4ERR_RECLAIM_CONFLICT:
1705 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1706 break;
1707 case -NFS4ERR_EXPIRED:
1708 case -NFS4ERR_NO_GRACE:
1709 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1710 fallthrough;
1711 case -NFS4ERR_STALE_CLIENTID:
1712 case -NFS4ERR_BADSESSION:
1713 case -NFS4ERR_BADSLOT:
1714 case -NFS4ERR_BAD_HIGH_SLOT:
1715 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1716 case -ETIMEDOUT:
1717 goto out_err;
1718 }
1719 nfs4_put_open_state(state);
1720 spin_lock(&sp->so_lock);
1721 goto restart;
1722 }
1723 spin_unlock(&sp->so_lock);
1724#ifdef CONFIG_NFS_V4_2
1725 if (found_ssc_copy_state)
1726 return -EIO;
1727#endif /* CONFIG_NFS_V4_2 */
1728 return 0;
1729out_err:
1730 nfs4_put_open_state(state);
1731 spin_lock(&sp->so_lock);
1732 spin_unlock(&sp->so_lock);
1733 return status;
1734}
1735
1736static void nfs4_clear_open_state(struct nfs4_state *state)
1737{
1738 struct nfs4_lock_state *lock;
1739
1740 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1741 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1742 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1743 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1744 spin_lock(&state->state_lock);
1745 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1746 lock->ls_seqid.flags = 0;
1747 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1748 }
1749 spin_unlock(&state->state_lock);
1750}
1751
1752static void nfs4_reset_seqids(struct nfs_server *server,
1753 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1754{
1755 struct nfs_client *clp = server->nfs_client;
1756 struct nfs4_state_owner *sp;
1757 struct rb_node *pos;
1758 struct nfs4_state *state;
1759
1760 spin_lock(&clp->cl_lock);
1761 for (pos = rb_first(&server->state_owners);
1762 pos != NULL;
1763 pos = rb_next(pos)) {
1764 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1765 sp->so_seqid.flags = 0;
1766 spin_lock(&sp->so_lock);
1767 list_for_each_entry(state, &sp->so_states, open_states) {
1768 if (mark_reclaim(clp, state))
1769 nfs4_clear_open_state(state);
1770 }
1771 spin_unlock(&sp->so_lock);
1772 }
1773 spin_unlock(&clp->cl_lock);
1774}
1775
1776static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1777 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1778{
1779 struct nfs_server *server;
1780
1781 rcu_read_lock();
1782 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1783 nfs4_reset_seqids(server, mark_reclaim);
1784 rcu_read_unlock();
1785}
1786
1787static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1788{
1789 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1790 /* Mark all delegations for reclaim */
1791 nfs_delegation_mark_reclaim(clp);
1792 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1793}
1794
1795static int nfs4_reclaim_complete(struct nfs_client *clp,
1796 const struct nfs4_state_recovery_ops *ops,
1797 const struct cred *cred)
1798{
1799 /* Notify the server we're done reclaiming our state */
1800 if (ops->reclaim_complete)
1801 return ops->reclaim_complete(clp, cred);
1802 return 0;
1803}
1804
1805static void nfs4_clear_reclaim_server(struct nfs_server *server)
1806{
1807 struct nfs_client *clp = server->nfs_client;
1808 struct nfs4_state_owner *sp;
1809 struct rb_node *pos;
1810 struct nfs4_state *state;
1811
1812 spin_lock(&clp->cl_lock);
1813 for (pos = rb_first(&server->state_owners);
1814 pos != NULL;
1815 pos = rb_next(pos)) {
1816 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1817 spin_lock(&sp->so_lock);
1818 list_for_each_entry(state, &sp->so_states, open_states) {
1819 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1820 &state->flags))
1821 continue;
1822 nfs4_state_mark_reclaim_nograce(clp, state);
1823 }
1824 spin_unlock(&sp->so_lock);
1825 }
1826 spin_unlock(&clp->cl_lock);
1827}
1828
1829static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1830{
1831 struct nfs_server *server;
1832
1833 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1834 return 0;
1835
1836 rcu_read_lock();
1837 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1838 nfs4_clear_reclaim_server(server);
1839 rcu_read_unlock();
1840
1841 nfs_delegation_reap_unclaimed(clp);
1842 return 1;
1843}
1844
1845static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1846{
1847 const struct nfs4_state_recovery_ops *ops;
1848 const struct cred *cred;
1849 int err;
1850
1851 if (!nfs4_state_clear_reclaim_reboot(clp))
1852 return;
1853 pnfs_destroy_all_layouts(clp);
1854 ops = clp->cl_mvops->reboot_recovery_ops;
1855 cred = nfs4_get_clid_cred(clp);
1856 err = nfs4_reclaim_complete(clp, ops, cred);
1857 put_cred(cred);
1858 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1859 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1860}
1861
1862static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1863{
1864 nfs_mark_test_expired_all_delegations(clp);
1865 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1866}
1867
1868static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1869{
1870 switch (error) {
1871 case 0:
1872 break;
1873 case -NFS4ERR_CB_PATH_DOWN:
1874 nfs40_handle_cb_pathdown(clp);
1875 break;
1876 case -NFS4ERR_NO_GRACE:
1877 nfs4_state_end_reclaim_reboot(clp);
1878 break;
1879 case -NFS4ERR_STALE_CLIENTID:
1880 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1881 nfs4_state_start_reclaim_reboot(clp);
1882 break;
1883 case -NFS4ERR_EXPIRED:
1884 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1885 nfs4_state_start_reclaim_nograce(clp);
1886 break;
1887 case -NFS4ERR_BADSESSION:
1888 case -NFS4ERR_BADSLOT:
1889 case -NFS4ERR_BAD_HIGH_SLOT:
1890 case -NFS4ERR_DEADSESSION:
1891 case -NFS4ERR_SEQ_FALSE_RETRY:
1892 case -NFS4ERR_SEQ_MISORDERED:
1893 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1894 /* Zero session reset errors */
1895 break;
1896 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1897 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1898 break;
1899 default:
1900 dprintk("%s: failed to handle error %d for server %s\n",
1901 __func__, error, clp->cl_hostname);
1902 return error;
1903 }
1904 dprintk("%s: handled error %d for server %s\n", __func__, error,
1905 clp->cl_hostname);
1906 return 0;
1907}
1908
1909static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1910{
1911 struct nfs4_state_owner *sp;
1912 struct nfs_server *server;
1913 struct rb_node *pos;
1914 LIST_HEAD(freeme);
1915 int lost_locks = 0;
1916 int status;
1917
1918 status = nfs4_begin_drain_session(clp);
1919 if (status < 0)
1920 return status;
1921restart:
1922 rcu_read_lock();
1923 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1924 nfs4_purge_state_owners(server, &freeme);
1925 spin_lock(&clp->cl_lock);
1926 for (pos = rb_first(&server->state_owners);
1927 pos != NULL;
1928 pos = rb_next(pos)) {
1929 sp = rb_entry(pos,
1930 struct nfs4_state_owner, so_server_node);
1931 if (!test_and_clear_bit(ops->owner_flag_bit,
1932 &sp->so_flags))
1933 continue;
1934 if (!atomic_inc_not_zero(&sp->so_count))
1935 continue;
1936 spin_unlock(&clp->cl_lock);
1937 rcu_read_unlock();
1938
1939 status = nfs4_reclaim_open_state(sp, ops, &lost_locks);
1940 if (status < 0) {
1941 if (lost_locks)
1942 pr_warn("NFS: %s: lost %d locks\n",
1943 clp->cl_hostname, lost_locks);
1944 set_bit(ops->owner_flag_bit, &sp->so_flags);
1945 nfs4_put_state_owner(sp);
1946 status = nfs4_recovery_handle_error(clp, status);
1947 nfs4_free_state_owners(&freeme);
1948 return (status != 0) ? status : -EAGAIN;
1949 }
1950
1951 nfs4_put_state_owner(sp);
1952 goto restart;
1953 }
1954 spin_unlock(&clp->cl_lock);
1955 }
1956 rcu_read_unlock();
1957 nfs4_free_state_owners(&freeme);
1958 if (lost_locks)
1959 pr_warn("NFS: %s: lost %d locks\n",
1960 clp->cl_hostname, lost_locks);
1961 return 0;
1962}
1963
1964static int nfs4_check_lease(struct nfs_client *clp)
1965{
1966 const struct cred *cred;
1967 const struct nfs4_state_maintenance_ops *ops =
1968 clp->cl_mvops->state_renewal_ops;
1969 int status;
1970
1971 /* Is the client already known to have an expired lease? */
1972 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1973 return 0;
1974 cred = ops->get_state_renewal_cred(clp);
1975 if (cred == NULL) {
1976 cred = nfs4_get_clid_cred(clp);
1977 status = -ENOKEY;
1978 if (cred == NULL)
1979 goto out;
1980 }
1981 status = ops->renew_lease(clp, cred);
1982 put_cred(cred);
1983 if (status == -ETIMEDOUT) {
1984 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1985 return 0;
1986 }
1987out:
1988 return nfs4_recovery_handle_error(clp, status);
1989}
1990
1991/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1992 * and for recoverable errors on EXCHANGE_ID for v4.1
1993 */
1994static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1995{
1996 switch (status) {
1997 case -NFS4ERR_SEQ_MISORDERED:
1998 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1999 return -ESERVERFAULT;
2000 /* Lease confirmation error: retry after purging the lease */
2001 ssleep(1);
2002 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2003 break;
2004 case -NFS4ERR_STALE_CLIENTID:
2005 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2006 nfs4_state_start_reclaim_reboot(clp);
2007 break;
2008 case -NFS4ERR_CLID_INUSE:
2009 pr_err("NFS: Server %s reports our clientid is in use\n",
2010 clp->cl_hostname);
2011 nfs_mark_client_ready(clp, -EPERM);
2012 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2013 return -EPERM;
2014 case -ETIMEDOUT:
2015 if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
2016 nfs_mark_client_ready(clp, -EIO);
2017 return -EIO;
2018 }
2019 fallthrough;
2020 case -EACCES:
2021 case -NFS4ERR_DELAY:
2022 case -EAGAIN:
2023 ssleep(1);
2024 break;
2025
2026 case -NFS4ERR_MINOR_VERS_MISMATCH:
2027 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2028 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
2029 dprintk("%s: exit with error %d for server %s\n",
2030 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2031 return -EPROTONOSUPPORT;
2032 case -ENOSPC:
2033 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2034 nfs_mark_client_ready(clp, -EIO);
2035 return -EIO;
2036 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2037 * in nfs4_exchange_id */
2038 default:
2039 dprintk("%s: exit with error %d for server %s\n", __func__,
2040 status, clp->cl_hostname);
2041 return status;
2042 }
2043 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2044 dprintk("%s: handled error %d for server %s\n", __func__, status,
2045 clp->cl_hostname);
2046 return 0;
2047}
2048
2049static int nfs4_establish_lease(struct nfs_client *clp)
2050{
2051 const struct cred *cred;
2052 const struct nfs4_state_recovery_ops *ops =
2053 clp->cl_mvops->reboot_recovery_ops;
2054 int status;
2055
2056 status = nfs4_begin_drain_session(clp);
2057 if (status != 0)
2058 return status;
2059 cred = nfs4_get_clid_cred(clp);
2060 if (cred == NULL)
2061 return -ENOENT;
2062 status = ops->establish_clid(clp, cred);
2063 put_cred(cred);
2064 if (status != 0)
2065 return status;
2066 return 0;
2067}
2068
2069/*
2070 * Returns zero or a negative errno. NFS4ERR values are converted
2071 * to local errno values.
2072 */
2073static int nfs4_reclaim_lease(struct nfs_client *clp)
2074{
2075 int status;
2076
2077 status = nfs4_establish_lease(clp);
2078 if (status < 0)
2079 return nfs4_handle_reclaim_lease_error(clp, status);
2080 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2081 nfs4_state_start_reclaim_nograce(clp);
2082 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2083 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2084 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2085 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2086 return 0;
2087}
2088
2089static int nfs4_purge_lease(struct nfs_client *clp)
2090{
2091 int status;
2092
2093 status = nfs4_establish_lease(clp);
2094 if (status < 0)
2095 return nfs4_handle_reclaim_lease_error(clp, status);
2096 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2097 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2098 nfs4_state_start_reclaim_nograce(clp);
2099 return 0;
2100}
2101
2102/*
2103 * Try remote migration of one FSID from a source server to a
2104 * destination server. The source server provides a list of
2105 * potential destinations.
2106 *
2107 * Returns zero or a negative NFS4ERR status code.
2108 */
2109static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2110{
2111 struct nfs_client *clp = server->nfs_client;
2112 struct nfs4_fs_locations *locations = NULL;
2113 struct nfs_fattr *fattr;
2114 struct inode *inode;
2115 struct page *page;
2116 int status, result;
2117
2118 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2119 (unsigned long long)server->fsid.major,
2120 (unsigned long long)server->fsid.minor,
2121 clp->cl_hostname);
2122
2123 page = alloc_page(GFP_KERNEL);
2124 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2125 fattr = nfs_alloc_fattr();
2126 if (page == NULL || locations == NULL || fattr == NULL) {
2127 dprintk("<-- %s: no memory\n", __func__);
2128 result = 0;
2129 goto out;
2130 }
2131
2132 locations->fattr = fattr;
2133 inode = d_inode(server->super->s_root);
2134 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2135 page, cred);
2136 if (result) {
2137 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2138 __func__, result);
2139 goto out;
2140 }
2141
2142 result = -NFS4ERR_NXIO;
2143 if (!locations->nlocations)
2144 goto out;
2145
2146 if (!(locations->fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2147 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2148 __func__);
2149 goto out;
2150 }
2151
2152 status = nfs4_begin_drain_session(clp);
2153 if (status != 0) {
2154 result = status;
2155 goto out;
2156 }
2157
2158 status = nfs4_replace_transport(server, locations);
2159 if (status != 0) {
2160 dprintk("<-- %s: failed to replace transport: %d\n",
2161 __func__, status);
2162 goto out;
2163 }
2164
2165 result = 0;
2166 dprintk("<-- %s: migration succeeded\n", __func__);
2167
2168out:
2169 if (page != NULL)
2170 __free_page(page);
2171 if (locations != NULL)
2172 kfree(locations->fattr);
2173 kfree(locations);
2174 if (result) {
2175 pr_err("NFS: migration recovery failed (server %s)\n",
2176 clp->cl_hostname);
2177 set_bit(NFS_MIG_FAILED, &server->mig_status);
2178 }
2179 return result;
2180}
2181
2182/*
2183 * Returns zero or a negative NFS4ERR status code.
2184 */
2185static int nfs4_handle_migration(struct nfs_client *clp)
2186{
2187 const struct nfs4_state_maintenance_ops *ops =
2188 clp->cl_mvops->state_renewal_ops;
2189 struct nfs_server *server;
2190 const struct cred *cred;
2191
2192 dprintk("%s: migration reported on \"%s\"\n", __func__,
2193 clp->cl_hostname);
2194
2195 cred = ops->get_state_renewal_cred(clp);
2196 if (cred == NULL)
2197 return -NFS4ERR_NOENT;
2198
2199 clp->cl_mig_gen++;
2200restart:
2201 rcu_read_lock();
2202 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2203 int status;
2204
2205 if (server->mig_gen == clp->cl_mig_gen)
2206 continue;
2207 server->mig_gen = clp->cl_mig_gen;
2208
2209 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2210 &server->mig_status))
2211 continue;
2212
2213 rcu_read_unlock();
2214 status = nfs4_try_migration(server, cred);
2215 if (status < 0) {
2216 put_cred(cred);
2217 return status;
2218 }
2219 goto restart;
2220 }
2221 rcu_read_unlock();
2222 put_cred(cred);
2223 return 0;
2224}
2225
2226/*
2227 * Test each nfs_server on the clp's cl_superblocks list to see
2228 * if it's moved to another server. Stop when the server no longer
2229 * returns NFS4ERR_LEASE_MOVED.
2230 */
2231static int nfs4_handle_lease_moved(struct nfs_client *clp)
2232{
2233 const struct nfs4_state_maintenance_ops *ops =
2234 clp->cl_mvops->state_renewal_ops;
2235 struct nfs_server *server;
2236 const struct cred *cred;
2237
2238 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2239 clp->cl_hostname);
2240
2241 cred = ops->get_state_renewal_cred(clp);
2242 if (cred == NULL)
2243 return -NFS4ERR_NOENT;
2244
2245 clp->cl_mig_gen++;
2246restart:
2247 rcu_read_lock();
2248 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2249 struct inode *inode;
2250 int status;
2251
2252 if (server->mig_gen == clp->cl_mig_gen)
2253 continue;
2254 server->mig_gen = clp->cl_mig_gen;
2255
2256 rcu_read_unlock();
2257
2258 inode = d_inode(server->super->s_root);
2259 status = nfs4_proc_fsid_present(inode, cred);
2260 if (status != -NFS4ERR_MOVED)
2261 goto restart; /* wasn't this one */
2262 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2263 goto restart; /* there are more */
2264 goto out;
2265 }
2266 rcu_read_unlock();
2267
2268out:
2269 put_cred(cred);
2270 return 0;
2271}
2272
2273/**
2274 * nfs4_discover_server_trunking - Detect server IP address trunking
2275 *
2276 * @clp: nfs_client under test
2277 * @result: OUT: found nfs_client, or clp
2278 *
2279 * Returns zero or a negative errno. If zero is returned,
2280 * an nfs_client pointer is planted in "result".
2281 *
2282 * Note: since we are invoked in process context, and
2283 * not from inside the state manager, we cannot use
2284 * nfs4_handle_reclaim_lease_error().
2285 */
2286int nfs4_discover_server_trunking(struct nfs_client *clp,
2287 struct nfs_client **result)
2288{
2289 const struct nfs4_state_recovery_ops *ops =
2290 clp->cl_mvops->reboot_recovery_ops;
2291 struct rpc_clnt *clnt;
2292 const struct cred *cred;
2293 int i, status;
2294
2295 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2296
2297 clnt = clp->cl_rpcclient;
2298 i = 0;
2299
2300 mutex_lock(&nfs_clid_init_mutex);
2301again:
2302 status = -ENOENT;
2303 cred = nfs4_get_clid_cred(clp);
2304 if (cred == NULL)
2305 goto out_unlock;
2306
2307 status = ops->detect_trunking(clp, result, cred);
2308 put_cred(cred);
2309 switch (status) {
2310 case 0:
2311 case -EINTR:
2312 case -ERESTARTSYS:
2313 break;
2314 case -ETIMEDOUT:
2315 if (clnt->cl_softrtry)
2316 break;
2317 fallthrough;
2318 case -NFS4ERR_DELAY:
2319 case -EAGAIN:
2320 ssleep(1);
2321 fallthrough;
2322 case -NFS4ERR_STALE_CLIENTID:
2323 dprintk("NFS: %s after status %d, retrying\n",
2324 __func__, status);
2325 goto again;
2326 case -EACCES:
2327 if (i++ == 0) {
2328 nfs4_root_machine_cred(clp);
2329 goto again;
2330 }
2331 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2332 break;
2333 fallthrough;
2334 case -NFS4ERR_CLID_INUSE:
2335 case -NFS4ERR_WRONGSEC:
2336 /* No point in retrying if we already used RPC_AUTH_UNIX */
2337 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2338 status = -EPERM;
2339 break;
2340 }
2341 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2342 if (IS_ERR(clnt)) {
2343 status = PTR_ERR(clnt);
2344 break;
2345 }
2346 /* Note: this is safe because we haven't yet marked the
2347 * client as ready, so we are the only user of
2348 * clp->cl_rpcclient
2349 */
2350 clnt = xchg(&clp->cl_rpcclient, clnt);
2351 rpc_shutdown_client(clnt);
2352 clnt = clp->cl_rpcclient;
2353 goto again;
2354
2355 case -NFS4ERR_MINOR_VERS_MISMATCH:
2356 status = -EPROTONOSUPPORT;
2357 break;
2358
2359 case -EKEYEXPIRED:
2360 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2361 * in nfs4_exchange_id */
2362 status = -EKEYEXPIRED;
2363 break;
2364 default:
2365 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2366 __func__, status);
2367 status = -EIO;
2368 }
2369
2370out_unlock:
2371 mutex_unlock(&nfs_clid_init_mutex);
2372 dprintk("NFS: %s: status = %d\n", __func__, status);
2373 return status;
2374}
2375
2376#ifdef CONFIG_NFS_V4_1
2377void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2378{
2379 struct nfs_client *clp = session->clp;
2380
2381 switch (err) {
2382 default:
2383 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2384 break;
2385 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2386 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2387 }
2388 nfs4_schedule_state_manager(clp);
2389}
2390EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2391
2392void nfs41_notify_server(struct nfs_client *clp)
2393{
2394 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2395 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2396 nfs4_schedule_state_manager(clp);
2397}
2398
2399static void nfs4_reset_all_state(struct nfs_client *clp)
2400{
2401 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2402 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2403 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2404 nfs4_state_start_reclaim_nograce(clp);
2405 dprintk("%s: scheduling reset of all state for server %s!\n",
2406 __func__, clp->cl_hostname);
2407 nfs4_schedule_state_manager(clp);
2408 }
2409}
2410
2411static void nfs41_handle_server_reboot(struct nfs_client *clp)
2412{
2413 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2414 nfs4_state_start_reclaim_reboot(clp);
2415 dprintk("%s: server %s rebooted!\n", __func__,
2416 clp->cl_hostname);
2417 nfs4_schedule_state_manager(clp);
2418 }
2419}
2420
2421static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2422{
2423 nfs4_reset_all_state(clp);
2424 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2425}
2426
2427static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2428{
2429 nfs4_state_start_reclaim_nograce(clp);
2430 nfs4_schedule_state_manager(clp);
2431
2432 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2433}
2434
2435static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2436{
2437 /* FIXME: For now, we destroy all layouts. */
2438 pnfs_destroy_all_layouts(clp);
2439 nfs_test_expired_all_delegations(clp);
2440 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2441 clp->cl_hostname);
2442}
2443
2444static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2445{
2446 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2447 nfs4_schedule_state_manager(clp);
2448
2449 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2450 clp->cl_hostname);
2451}
2452
2453static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2454{
2455 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2456 &clp->cl_state) == 0)
2457 nfs4_schedule_state_manager(clp);
2458}
2459
2460void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2461 bool recovery)
2462{
2463 if (!flags)
2464 return;
2465
2466 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2467 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2468 /*
2469 * If we're called from the state manager thread, then assume we're
2470 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2471 * Those flags are expected to remain set until we're done
2472 * recovering (see RFC5661, section 18.46.3).
2473 */
2474 if (recovery)
2475 goto out_recovery;
2476
2477 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2478 nfs41_handle_server_reboot(clp);
2479 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2480 nfs41_handle_all_state_revoked(clp);
2481 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2482 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2483 nfs41_handle_some_state_revoked(clp);
2484 if (flags & SEQ4_STATUS_LEASE_MOVED)
2485 nfs4_schedule_lease_moved_recovery(clp);
2486 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2487 nfs41_handle_recallable_state_revoked(clp);
2488out_recovery:
2489 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2490 nfs41_handle_backchannel_fault(clp);
2491 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2492 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2493 nfs41_handle_cb_path_down(clp);
2494}
2495
2496static int nfs4_reset_session(struct nfs_client *clp)
2497{
2498 const struct cred *cred;
2499 int status;
2500
2501 if (!nfs4_has_session(clp))
2502 return 0;
2503 status = nfs4_begin_drain_session(clp);
2504 if (status != 0)
2505 return status;
2506 cred = nfs4_get_clid_cred(clp);
2507 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2508 switch (status) {
2509 case 0:
2510 case -NFS4ERR_BADSESSION:
2511 case -NFS4ERR_DEADSESSION:
2512 break;
2513 case -NFS4ERR_BACK_CHAN_BUSY:
2514 case -NFS4ERR_DELAY:
2515 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2516 status = 0;
2517 ssleep(1);
2518 goto out;
2519 default:
2520 status = nfs4_recovery_handle_error(clp, status);
2521 goto out;
2522 }
2523
2524 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2525 status = nfs4_proc_create_session(clp, cred);
2526 if (status) {
2527 dprintk("%s: session reset failed with status %d for server %s!\n",
2528 __func__, status, clp->cl_hostname);
2529 status = nfs4_handle_reclaim_lease_error(clp, status);
2530 goto out;
2531 }
2532 nfs41_finish_session_reset(clp);
2533 dprintk("%s: session reset was successful for server %s!\n",
2534 __func__, clp->cl_hostname);
2535out:
2536 put_cred(cred);
2537 return status;
2538}
2539
2540static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2541{
2542 const struct cred *cred;
2543 int ret;
2544
2545 if (!nfs4_has_session(clp))
2546 return 0;
2547 ret = nfs4_begin_drain_session(clp);
2548 if (ret != 0)
2549 return ret;
2550 cred = nfs4_get_clid_cred(clp);
2551 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2552 put_cred(cred);
2553 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2554 switch (ret) {
2555 case 0:
2556 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2557 __func__, clp->cl_hostname);
2558 break;
2559 case -NFS4ERR_DELAY:
2560 ssleep(1);
2561 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2562 break;
2563 default:
2564 return nfs4_recovery_handle_error(clp, ret);
2565 }
2566 return 0;
2567}
2568
2569static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2570{
2571 int iomode = 0;
2572
2573 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2574 iomode += IOMODE_READ;
2575 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2576 iomode += IOMODE_RW;
2577 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2578 if (iomode) {
2579 pnfs_layout_return_unused_byclid(clp, iomode);
2580 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2581 }
2582}
2583#else /* CONFIG_NFS_V4_1 */
2584static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2585
2586static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2587{
2588 return 0;
2589}
2590
2591static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2592{
2593}
2594#endif /* CONFIG_NFS_V4_1 */
2595
2596static void nfs4_state_manager(struct nfs_client *clp)
2597{
2598 unsigned int memflags;
2599 int status = 0;
2600 const char *section = "", *section_sep = "";
2601
2602 /*
2603 * State recovery can deadlock if the direct reclaim code tries
2604 * start NFS writeback. So ensure memory allocations are all
2605 * GFP_NOFS.
2606 */
2607 memflags = memalloc_nofs_save();
2608
2609 /* Ensure exclusive access to NFSv4 state */
2610 do {
2611 trace_nfs4_state_mgr(clp);
2612 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2613 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2614 section = "purge state";
2615 status = nfs4_purge_lease(clp);
2616 if (status < 0)
2617 goto out_error;
2618 continue;
2619 }
2620
2621 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2622 section = "lease expired";
2623 /* We're going to have to re-establish a clientid */
2624 status = nfs4_reclaim_lease(clp);
2625 if (status < 0)
2626 goto out_error;
2627 continue;
2628 }
2629
2630 /* Initialize or reset the session */
2631 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2632 section = "reset session";
2633 status = nfs4_reset_session(clp);
2634 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2635 continue;
2636 if (status < 0)
2637 goto out_error;
2638 }
2639
2640 /* Send BIND_CONN_TO_SESSION */
2641 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2642 &clp->cl_state)) {
2643 section = "bind conn to session";
2644 status = nfs4_bind_conn_to_session(clp);
2645 if (status < 0)
2646 goto out_error;
2647 continue;
2648 }
2649
2650 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2651 section = "check lease";
2652 status = nfs4_check_lease(clp);
2653 if (status < 0)
2654 goto out_error;
2655 continue;
2656 }
2657
2658 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2659 section = "migration";
2660 status = nfs4_handle_migration(clp);
2661 if (status < 0)
2662 goto out_error;
2663 }
2664
2665 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2666 section = "lease moved";
2667 status = nfs4_handle_lease_moved(clp);
2668 if (status < 0)
2669 goto out_error;
2670 }
2671
2672 /* First recover reboot state... */
2673 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2674 section = "reclaim reboot";
2675 status = nfs4_do_reclaim(clp,
2676 clp->cl_mvops->reboot_recovery_ops);
2677 if (status == 0)
2678 status = pnfs_layout_handle_reboot(clp);
2679 if (status == -EAGAIN)
2680 continue;
2681 if (status < 0)
2682 goto out_error;
2683 nfs4_state_end_reclaim_reboot(clp);
2684 continue;
2685 }
2686
2687 /* Detect expired delegations... */
2688 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2689 section = "detect expired delegations";
2690 status = nfs4_begin_drain_session(clp);
2691 if (status < 0)
2692 goto out_error;
2693 nfs_reap_expired_delegations(clp);
2694 continue;
2695 }
2696
2697 /* Now recover expired state... */
2698 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2699 section = "reclaim nograce";
2700 status = nfs4_do_reclaim(clp,
2701 clp->cl_mvops->nograce_recovery_ops);
2702 if (status == -EAGAIN)
2703 continue;
2704 if (status < 0)
2705 goto out_error;
2706 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2707 }
2708
2709 memalloc_nofs_restore(memflags);
2710 nfs4_end_drain_session(clp);
2711 nfs4_clear_state_manager_bit(clp);
2712
2713 if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2714 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING,
2715 &clp->cl_state)) {
2716 memflags = memalloc_nofs_save();
2717 continue;
2718 }
2719
2720 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
2721 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2722 nfs_client_return_marked_delegations(clp);
2723 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2724 }
2725 nfs4_layoutreturn_any_run(clp);
2726 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
2727 }
2728
2729 return;
2730
2731 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2732 goto out_drain;
2733
2734out_error:
2735 if (strlen(section))
2736 section_sep = ": ";
2737 trace_nfs4_state_mgr_failed(clp, section, status);
2738 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2739 " with error %d\n", section_sep, section,
2740 clp->cl_hostname, -status);
2741 ssleep(1);
2742out_drain:
2743 memalloc_nofs_restore(memflags);
2744 nfs4_end_drain_session(clp);
2745 nfs4_clear_state_manager_bit(clp);
2746}
2747
2748static int nfs4_run_state_manager(void *ptr)
2749{
2750 struct nfs_client *clp = ptr;
2751 struct rpc_clnt *cl = clp->cl_rpcclient;
2752
2753 while (cl != cl->cl_parent)
2754 cl = cl->cl_parent;
2755
2756 allow_signal(SIGKILL);
2757again:
2758 nfs4_state_manager(clp);
2759
2760 if (test_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) &&
2761 !test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state)) {
2762 wait_var_event_interruptible(&clp->cl_state,
2763 test_bit(NFS4CLNT_RUN_MANAGER,
2764 &clp->cl_state));
2765 if (!atomic_read(&cl->cl_swapper))
2766 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2767 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2768 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2769 goto again;
2770 /* Either no longer a swapper, or were signalled */
2771 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2772 }
2773
2774 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2775 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2776 !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state))
2777 goto again;
2778
2779 nfs_put_client(clp);
2780 module_put_and_kthread_exit(0);
2781 return 0;
2782}
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/nfs_idmap.h>
46#include <linux/kthread.h>
47#include <linux/module.h>
48#include <linux/random.h>
49#include <linux/ratelimit.h>
50#include <linux/workqueue.h>
51#include <linux/bitops.h>
52#include <linux/jiffies.h>
53
54#include "nfs4_fs.h"
55#include "callback.h"
56#include "delegation.h"
57#include "internal.h"
58#include "pnfs.h"
59
60#define NFSDBG_FACILITY NFSDBG_STATE
61
62#define OPENOWNER_POOL_SIZE 8
63
64const nfs4_stateid zero_stateid;
65
66static LIST_HEAD(nfs4_clientid_list);
67
68int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
69{
70 struct nfs4_setclientid_res clid = {
71 .clientid = clp->cl_clientid,
72 .confirm = clp->cl_confirm,
73 };
74 unsigned short port;
75 int status;
76
77 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
78 goto do_confirm;
79 port = nfs_callback_tcpport;
80 if (clp->cl_addr.ss_family == AF_INET6)
81 port = nfs_callback_tcpport6;
82
83 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
84 if (status != 0)
85 goto out;
86 clp->cl_clientid = clid.clientid;
87 clp->cl_confirm = clid.confirm;
88 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
89do_confirm:
90 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
91 if (status != 0)
92 goto out;
93 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
94 nfs4_schedule_state_renewal(clp);
95out:
96 return status;
97}
98
99struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
100{
101 struct rpc_cred *cred = NULL;
102
103 if (clp->cl_machine_cred != NULL)
104 cred = get_rpccred(clp->cl_machine_cred);
105 return cred;
106}
107
108static void nfs4_clear_machine_cred(struct nfs_client *clp)
109{
110 struct rpc_cred *cred;
111
112 spin_lock(&clp->cl_lock);
113 cred = clp->cl_machine_cred;
114 clp->cl_machine_cred = NULL;
115 spin_unlock(&clp->cl_lock);
116 if (cred != NULL)
117 put_rpccred(cred);
118}
119
120static struct rpc_cred *
121nfs4_get_renew_cred_server_locked(struct nfs_server *server)
122{
123 struct rpc_cred *cred = NULL;
124 struct nfs4_state_owner *sp;
125 struct rb_node *pos;
126
127 for (pos = rb_first(&server->state_owners);
128 pos != NULL;
129 pos = rb_next(pos)) {
130 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
131 if (list_empty(&sp->so_states))
132 continue;
133 cred = get_rpccred(sp->so_cred);
134 break;
135 }
136 return cred;
137}
138
139/**
140 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
141 * @clp: client state handle
142 *
143 * Returns an rpc_cred with reference count bumped, or NULL.
144 * Caller must hold clp->cl_lock.
145 */
146struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
147{
148 struct rpc_cred *cred = NULL;
149 struct nfs_server *server;
150
151 /* Use machine credentials if available */
152 cred = nfs4_get_machine_cred_locked(clp);
153 if (cred != NULL)
154 goto out;
155
156 rcu_read_lock();
157 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
158 cred = nfs4_get_renew_cred_server_locked(server);
159 if (cred != NULL)
160 break;
161 }
162 rcu_read_unlock();
163
164out:
165 return cred;
166}
167
168#if defined(CONFIG_NFS_V4_1)
169
170static int nfs41_setup_state_renewal(struct nfs_client *clp)
171{
172 int status;
173 struct nfs_fsinfo fsinfo;
174
175 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
176 nfs4_schedule_state_renewal(clp);
177 return 0;
178 }
179
180 status = nfs4_proc_get_lease_time(clp, &fsinfo);
181 if (status == 0) {
182 /* Update lease time and schedule renewal */
183 spin_lock(&clp->cl_lock);
184 clp->cl_lease_time = fsinfo.lease_time * HZ;
185 clp->cl_last_renewal = jiffies;
186 spin_unlock(&clp->cl_lock);
187
188 nfs4_schedule_state_renewal(clp);
189 }
190
191 return status;
192}
193
194/*
195 * Back channel returns NFS4ERR_DELAY for new requests when
196 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
197 * is ended.
198 */
199static void nfs4_end_drain_session(struct nfs_client *clp)
200{
201 struct nfs4_session *ses = clp->cl_session;
202 struct nfs4_slot_table *tbl;
203 int max_slots;
204
205 if (ses == NULL)
206 return;
207 tbl = &ses->fc_slot_table;
208 if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
209 spin_lock(&tbl->slot_tbl_lock);
210 max_slots = tbl->max_slots;
211 while (max_slots--) {
212 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
213 nfs4_set_task_privileged,
214 NULL) == NULL)
215 break;
216 }
217 spin_unlock(&tbl->slot_tbl_lock);
218 }
219}
220
221static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
222{
223 spin_lock(&tbl->slot_tbl_lock);
224 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
225 INIT_COMPLETION(tbl->complete);
226 spin_unlock(&tbl->slot_tbl_lock);
227 return wait_for_completion_interruptible(&tbl->complete);
228 }
229 spin_unlock(&tbl->slot_tbl_lock);
230 return 0;
231}
232
233static int nfs4_begin_drain_session(struct nfs_client *clp)
234{
235 struct nfs4_session *ses = clp->cl_session;
236 int ret = 0;
237
238 set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
239 /* back channel */
240 ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
241 if (ret)
242 return ret;
243 /* fore channel */
244 return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
245}
246
247static void nfs41_finish_session_reset(struct nfs_client *clp)
248{
249 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
250 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
251 /* create_session negotiated new slot table */
252 clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
253 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
254 nfs41_setup_state_renewal(clp);
255}
256
257int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
258{
259 int status;
260
261 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
262 goto do_confirm;
263 nfs4_begin_drain_session(clp);
264 status = nfs4_proc_exchange_id(clp, cred);
265 if (status != 0)
266 goto out;
267 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
268do_confirm:
269 status = nfs4_proc_create_session(clp, cred);
270 if (status != 0)
271 goto out;
272 nfs41_finish_session_reset(clp);
273 nfs_mark_client_ready(clp, NFS_CS_READY);
274out:
275 return status;
276}
277
278struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
279{
280 struct rpc_cred *cred;
281
282 spin_lock(&clp->cl_lock);
283 cred = nfs4_get_machine_cred_locked(clp);
284 spin_unlock(&clp->cl_lock);
285 return cred;
286}
287
288#endif /* CONFIG_NFS_V4_1 */
289
290static struct rpc_cred *
291nfs4_get_setclientid_cred_server(struct nfs_server *server)
292{
293 struct nfs_client *clp = server->nfs_client;
294 struct rpc_cred *cred = NULL;
295 struct nfs4_state_owner *sp;
296 struct rb_node *pos;
297
298 spin_lock(&clp->cl_lock);
299 pos = rb_first(&server->state_owners);
300 if (pos != NULL) {
301 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
302 cred = get_rpccred(sp->so_cred);
303 }
304 spin_unlock(&clp->cl_lock);
305 return cred;
306}
307
308/**
309 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
310 * @clp: client state handle
311 *
312 * Returns an rpc_cred with reference count bumped, or NULL.
313 */
314struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
315{
316 struct nfs_server *server;
317 struct rpc_cred *cred;
318
319 spin_lock(&clp->cl_lock);
320 cred = nfs4_get_machine_cred_locked(clp);
321 spin_unlock(&clp->cl_lock);
322 if (cred != NULL)
323 goto out;
324
325 rcu_read_lock();
326 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
327 cred = nfs4_get_setclientid_cred_server(server);
328 if (cred != NULL)
329 break;
330 }
331 rcu_read_unlock();
332
333out:
334 return cred;
335}
336
337static struct nfs4_state_owner *
338nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
339{
340 struct rb_node **p = &server->state_owners.rb_node,
341 *parent = NULL;
342 struct nfs4_state_owner *sp;
343
344 while (*p != NULL) {
345 parent = *p;
346 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
347
348 if (cred < sp->so_cred)
349 p = &parent->rb_left;
350 else if (cred > sp->so_cred)
351 p = &parent->rb_right;
352 else {
353 if (!list_empty(&sp->so_lru))
354 list_del_init(&sp->so_lru);
355 atomic_inc(&sp->so_count);
356 return sp;
357 }
358 }
359 return NULL;
360}
361
362static struct nfs4_state_owner *
363nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
364{
365 struct nfs_server *server = new->so_server;
366 struct rb_node **p = &server->state_owners.rb_node,
367 *parent = NULL;
368 struct nfs4_state_owner *sp;
369 int err;
370
371 while (*p != NULL) {
372 parent = *p;
373 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
374
375 if (new->so_cred < sp->so_cred)
376 p = &parent->rb_left;
377 else if (new->so_cred > sp->so_cred)
378 p = &parent->rb_right;
379 else {
380 if (!list_empty(&sp->so_lru))
381 list_del_init(&sp->so_lru);
382 atomic_inc(&sp->so_count);
383 return sp;
384 }
385 }
386 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
387 if (err)
388 return ERR_PTR(err);
389 rb_link_node(&new->so_server_node, parent, p);
390 rb_insert_color(&new->so_server_node, &server->state_owners);
391 return new;
392}
393
394static void
395nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
396{
397 struct nfs_server *server = sp->so_server;
398
399 if (!RB_EMPTY_NODE(&sp->so_server_node))
400 rb_erase(&sp->so_server_node, &server->state_owners);
401 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
402}
403
404static void
405nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
406{
407 sc->create_time = ktime_get();
408 sc->flags = 0;
409 sc->counter = 0;
410 spin_lock_init(&sc->lock);
411 INIT_LIST_HEAD(&sc->list);
412 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
413}
414
415static void
416nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
417{
418 rpc_destroy_wait_queue(&sc->wait);
419}
420
421/*
422 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
423 * create a new state_owner.
424 *
425 */
426static struct nfs4_state_owner *
427nfs4_alloc_state_owner(struct nfs_server *server,
428 struct rpc_cred *cred,
429 gfp_t gfp_flags)
430{
431 struct nfs4_state_owner *sp;
432
433 sp = kzalloc(sizeof(*sp), gfp_flags);
434 if (!sp)
435 return NULL;
436 sp->so_server = server;
437 sp->so_cred = get_rpccred(cred);
438 spin_lock_init(&sp->so_lock);
439 INIT_LIST_HEAD(&sp->so_states);
440 nfs4_init_seqid_counter(&sp->so_seqid);
441 atomic_set(&sp->so_count, 1);
442 INIT_LIST_HEAD(&sp->so_lru);
443 return sp;
444}
445
446static void
447nfs4_drop_state_owner(struct nfs4_state_owner *sp)
448{
449 struct rb_node *rb_node = &sp->so_server_node;
450
451 if (!RB_EMPTY_NODE(rb_node)) {
452 struct nfs_server *server = sp->so_server;
453 struct nfs_client *clp = server->nfs_client;
454
455 spin_lock(&clp->cl_lock);
456 if (!RB_EMPTY_NODE(rb_node)) {
457 rb_erase(rb_node, &server->state_owners);
458 RB_CLEAR_NODE(rb_node);
459 }
460 spin_unlock(&clp->cl_lock);
461 }
462}
463
464static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
465{
466 nfs4_destroy_seqid_counter(&sp->so_seqid);
467 put_rpccred(sp->so_cred);
468 kfree(sp);
469}
470
471static void nfs4_gc_state_owners(struct nfs_server *server)
472{
473 struct nfs_client *clp = server->nfs_client;
474 struct nfs4_state_owner *sp, *tmp;
475 unsigned long time_min, time_max;
476 LIST_HEAD(doomed);
477
478 spin_lock(&clp->cl_lock);
479 time_max = jiffies;
480 time_min = (long)time_max - (long)clp->cl_lease_time;
481 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
482 /* NB: LRU is sorted so that oldest is at the head */
483 if (time_in_range(sp->so_expires, time_min, time_max))
484 break;
485 list_move(&sp->so_lru, &doomed);
486 nfs4_remove_state_owner_locked(sp);
487 }
488 spin_unlock(&clp->cl_lock);
489
490 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
491 list_del(&sp->so_lru);
492 nfs4_free_state_owner(sp);
493 }
494}
495
496/**
497 * nfs4_get_state_owner - Look up a state owner given a credential
498 * @server: nfs_server to search
499 * @cred: RPC credential to match
500 *
501 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
502 */
503struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
504 struct rpc_cred *cred,
505 gfp_t gfp_flags)
506{
507 struct nfs_client *clp = server->nfs_client;
508 struct nfs4_state_owner *sp, *new;
509
510 spin_lock(&clp->cl_lock);
511 sp = nfs4_find_state_owner_locked(server, cred);
512 spin_unlock(&clp->cl_lock);
513 if (sp != NULL)
514 goto out;
515 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
516 if (new == NULL)
517 goto out;
518 do {
519 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
520 break;
521 spin_lock(&clp->cl_lock);
522 sp = nfs4_insert_state_owner_locked(new);
523 spin_unlock(&clp->cl_lock);
524 } while (sp == ERR_PTR(-EAGAIN));
525 if (sp != new)
526 nfs4_free_state_owner(new);
527out:
528 nfs4_gc_state_owners(server);
529 return sp;
530}
531
532/**
533 * nfs4_put_state_owner - Release a nfs4_state_owner
534 * @sp: state owner data to release
535 *
536 * Note that we keep released state owners on an LRU
537 * list.
538 * This caches valid state owners so that they can be
539 * reused, to avoid the OPEN_CONFIRM on minor version 0.
540 * It also pins the uniquifier of dropped state owners for
541 * a while, to ensure that those state owner names are
542 * never reused.
543 */
544void nfs4_put_state_owner(struct nfs4_state_owner *sp)
545{
546 struct nfs_server *server = sp->so_server;
547 struct nfs_client *clp = server->nfs_client;
548
549 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
550 return;
551
552 sp->so_expires = jiffies;
553 list_add_tail(&sp->so_lru, &server->state_owners_lru);
554 spin_unlock(&clp->cl_lock);
555}
556
557/**
558 * nfs4_purge_state_owners - Release all cached state owners
559 * @server: nfs_server with cached state owners to release
560 *
561 * Called at umount time. Remaining state owners will be on
562 * the LRU with ref count of zero.
563 */
564void nfs4_purge_state_owners(struct nfs_server *server)
565{
566 struct nfs_client *clp = server->nfs_client;
567 struct nfs4_state_owner *sp, *tmp;
568 LIST_HEAD(doomed);
569
570 spin_lock(&clp->cl_lock);
571 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
572 list_move(&sp->so_lru, &doomed);
573 nfs4_remove_state_owner_locked(sp);
574 }
575 spin_unlock(&clp->cl_lock);
576
577 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
578 list_del(&sp->so_lru);
579 nfs4_free_state_owner(sp);
580 }
581}
582
583static struct nfs4_state *
584nfs4_alloc_open_state(void)
585{
586 struct nfs4_state *state;
587
588 state = kzalloc(sizeof(*state), GFP_NOFS);
589 if (!state)
590 return NULL;
591 atomic_set(&state->count, 1);
592 INIT_LIST_HEAD(&state->lock_states);
593 spin_lock_init(&state->state_lock);
594 seqlock_init(&state->seqlock);
595 return state;
596}
597
598void
599nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
600{
601 if (state->state == fmode)
602 return;
603 /* NB! List reordering - see the reclaim code for why. */
604 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
605 if (fmode & FMODE_WRITE)
606 list_move(&state->open_states, &state->owner->so_states);
607 else
608 list_move_tail(&state->open_states, &state->owner->so_states);
609 }
610 state->state = fmode;
611}
612
613static struct nfs4_state *
614__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
615{
616 struct nfs_inode *nfsi = NFS_I(inode);
617 struct nfs4_state *state;
618
619 list_for_each_entry(state, &nfsi->open_states, inode_states) {
620 if (state->owner != owner)
621 continue;
622 if (atomic_inc_not_zero(&state->count))
623 return state;
624 }
625 return NULL;
626}
627
628static void
629nfs4_free_open_state(struct nfs4_state *state)
630{
631 kfree(state);
632}
633
634struct nfs4_state *
635nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
636{
637 struct nfs4_state *state, *new;
638 struct nfs_inode *nfsi = NFS_I(inode);
639
640 spin_lock(&inode->i_lock);
641 state = __nfs4_find_state_byowner(inode, owner);
642 spin_unlock(&inode->i_lock);
643 if (state)
644 goto out;
645 new = nfs4_alloc_open_state();
646 spin_lock(&owner->so_lock);
647 spin_lock(&inode->i_lock);
648 state = __nfs4_find_state_byowner(inode, owner);
649 if (state == NULL && new != NULL) {
650 state = new;
651 state->owner = owner;
652 atomic_inc(&owner->so_count);
653 list_add(&state->inode_states, &nfsi->open_states);
654 ihold(inode);
655 state->inode = inode;
656 spin_unlock(&inode->i_lock);
657 /* Note: The reclaim code dictates that we add stateless
658 * and read-only stateids to the end of the list */
659 list_add_tail(&state->open_states, &owner->so_states);
660 spin_unlock(&owner->so_lock);
661 } else {
662 spin_unlock(&inode->i_lock);
663 spin_unlock(&owner->so_lock);
664 if (new)
665 nfs4_free_open_state(new);
666 }
667out:
668 return state;
669}
670
671void nfs4_put_open_state(struct nfs4_state *state)
672{
673 struct inode *inode = state->inode;
674 struct nfs4_state_owner *owner = state->owner;
675
676 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
677 return;
678 spin_lock(&inode->i_lock);
679 list_del(&state->inode_states);
680 list_del(&state->open_states);
681 spin_unlock(&inode->i_lock);
682 spin_unlock(&owner->so_lock);
683 iput(inode);
684 nfs4_free_open_state(state);
685 nfs4_put_state_owner(owner);
686}
687
688/*
689 * Close the current file.
690 */
691static void __nfs4_close(struct nfs4_state *state,
692 fmode_t fmode, gfp_t gfp_mask, int wait)
693{
694 struct nfs4_state_owner *owner = state->owner;
695 int call_close = 0;
696 fmode_t newstate;
697
698 atomic_inc(&owner->so_count);
699 /* Protect against nfs4_find_state() */
700 spin_lock(&owner->so_lock);
701 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
702 case FMODE_READ:
703 state->n_rdonly--;
704 break;
705 case FMODE_WRITE:
706 state->n_wronly--;
707 break;
708 case FMODE_READ|FMODE_WRITE:
709 state->n_rdwr--;
710 }
711 newstate = FMODE_READ|FMODE_WRITE;
712 if (state->n_rdwr == 0) {
713 if (state->n_rdonly == 0) {
714 newstate &= ~FMODE_READ;
715 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
716 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
717 }
718 if (state->n_wronly == 0) {
719 newstate &= ~FMODE_WRITE;
720 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
721 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
722 }
723 if (newstate == 0)
724 clear_bit(NFS_DELEGATED_STATE, &state->flags);
725 }
726 nfs4_state_set_mode_locked(state, newstate);
727 spin_unlock(&owner->so_lock);
728
729 if (!call_close) {
730 nfs4_put_open_state(state);
731 nfs4_put_state_owner(owner);
732 } else {
733 bool roc = pnfs_roc(state->inode);
734
735 nfs4_do_close(state, gfp_mask, wait, roc);
736 }
737}
738
739void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
740{
741 __nfs4_close(state, fmode, GFP_NOFS, 0);
742}
743
744void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
745{
746 __nfs4_close(state, fmode, GFP_KERNEL, 1);
747}
748
749/*
750 * Search the state->lock_states for an existing lock_owner
751 * that is compatible with current->files
752 */
753static struct nfs4_lock_state *
754__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
755{
756 struct nfs4_lock_state *pos;
757 list_for_each_entry(pos, &state->lock_states, ls_locks) {
758 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
759 continue;
760 switch (pos->ls_owner.lo_type) {
761 case NFS4_POSIX_LOCK_TYPE:
762 if (pos->ls_owner.lo_u.posix_owner != fl_owner)
763 continue;
764 break;
765 case NFS4_FLOCK_LOCK_TYPE:
766 if (pos->ls_owner.lo_u.flock_owner != fl_pid)
767 continue;
768 }
769 atomic_inc(&pos->ls_count);
770 return pos;
771 }
772 return NULL;
773}
774
775/*
776 * Return a compatible lock_state. If no initialized lock_state structure
777 * exists, return an uninitialized one.
778 *
779 */
780static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
781{
782 struct nfs4_lock_state *lsp;
783 struct nfs_server *server = state->owner->so_server;
784
785 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
786 if (lsp == NULL)
787 return NULL;
788 nfs4_init_seqid_counter(&lsp->ls_seqid);
789 atomic_set(&lsp->ls_count, 1);
790 lsp->ls_state = state;
791 lsp->ls_owner.lo_type = type;
792 switch (lsp->ls_owner.lo_type) {
793 case NFS4_FLOCK_LOCK_TYPE:
794 lsp->ls_owner.lo_u.flock_owner = fl_pid;
795 break;
796 case NFS4_POSIX_LOCK_TYPE:
797 lsp->ls_owner.lo_u.posix_owner = fl_owner;
798 break;
799 default:
800 goto out_free;
801 }
802 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
803 if (lsp->ls_seqid.owner_id < 0)
804 goto out_free;
805 INIT_LIST_HEAD(&lsp->ls_locks);
806 return lsp;
807out_free:
808 kfree(lsp);
809 return NULL;
810}
811
812void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
813{
814 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
815 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
816 kfree(lsp);
817}
818
819/*
820 * Return a compatible lock_state. If no initialized lock_state structure
821 * exists, return an uninitialized one.
822 *
823 */
824static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
825{
826 struct nfs4_lock_state *lsp, *new = NULL;
827
828 for(;;) {
829 spin_lock(&state->state_lock);
830 lsp = __nfs4_find_lock_state(state, owner, pid, type);
831 if (lsp != NULL)
832 break;
833 if (new != NULL) {
834 list_add(&new->ls_locks, &state->lock_states);
835 set_bit(LK_STATE_IN_USE, &state->flags);
836 lsp = new;
837 new = NULL;
838 break;
839 }
840 spin_unlock(&state->state_lock);
841 new = nfs4_alloc_lock_state(state, owner, pid, type);
842 if (new == NULL)
843 return NULL;
844 }
845 spin_unlock(&state->state_lock);
846 if (new != NULL)
847 nfs4_free_lock_state(state->owner->so_server, new);
848 return lsp;
849}
850
851/*
852 * Release reference to lock_state, and free it if we see that
853 * it is no longer in use
854 */
855void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
856{
857 struct nfs4_state *state;
858
859 if (lsp == NULL)
860 return;
861 state = lsp->ls_state;
862 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
863 return;
864 list_del(&lsp->ls_locks);
865 if (list_empty(&state->lock_states))
866 clear_bit(LK_STATE_IN_USE, &state->flags);
867 spin_unlock(&state->state_lock);
868 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
869 if (nfs4_release_lockowner(lsp) == 0)
870 return;
871 }
872 nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
873}
874
875static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
876{
877 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
878
879 dst->fl_u.nfs4_fl.owner = lsp;
880 atomic_inc(&lsp->ls_count);
881}
882
883static void nfs4_fl_release_lock(struct file_lock *fl)
884{
885 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
886}
887
888static const struct file_lock_operations nfs4_fl_lock_ops = {
889 .fl_copy_lock = nfs4_fl_copy_lock,
890 .fl_release_private = nfs4_fl_release_lock,
891};
892
893int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
894{
895 struct nfs4_lock_state *lsp;
896
897 if (fl->fl_ops != NULL)
898 return 0;
899 if (fl->fl_flags & FL_POSIX)
900 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
901 else if (fl->fl_flags & FL_FLOCK)
902 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
903 NFS4_FLOCK_LOCK_TYPE);
904 else
905 return -EINVAL;
906 if (lsp == NULL)
907 return -ENOMEM;
908 fl->fl_u.nfs4_fl.owner = lsp;
909 fl->fl_ops = &nfs4_fl_lock_ops;
910 return 0;
911}
912
913static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
914 fl_owner_t fl_owner, pid_t fl_pid)
915{
916 struct nfs4_lock_state *lsp;
917 bool ret = false;
918
919 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
920 goto out;
921
922 spin_lock(&state->state_lock);
923 lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
924 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
925 nfs4_stateid_copy(dst, &lsp->ls_stateid);
926 ret = true;
927 }
928 spin_unlock(&state->state_lock);
929 nfs4_put_lock_state(lsp);
930out:
931 return ret;
932}
933
934static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
935{
936 int seq;
937
938 do {
939 seq = read_seqbegin(&state->seqlock);
940 nfs4_stateid_copy(dst, &state->stateid);
941 } while (read_seqretry(&state->seqlock, seq));
942}
943
944/*
945 * Byte-range lock aware utility to initialize the stateid of read/write
946 * requests.
947 */
948void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
949 fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
950{
951 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
952 return;
953 if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
954 return;
955 nfs4_copy_open_stateid(dst, state);
956}
957
958struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
959{
960 struct nfs_seqid *new;
961
962 new = kmalloc(sizeof(*new), gfp_mask);
963 if (new != NULL) {
964 new->sequence = counter;
965 INIT_LIST_HEAD(&new->list);
966 new->task = NULL;
967 }
968 return new;
969}
970
971void nfs_release_seqid(struct nfs_seqid *seqid)
972{
973 struct nfs_seqid_counter *sequence;
974
975 if (list_empty(&seqid->list))
976 return;
977 sequence = seqid->sequence;
978 spin_lock(&sequence->lock);
979 list_del_init(&seqid->list);
980 if (!list_empty(&sequence->list)) {
981 struct nfs_seqid *next;
982
983 next = list_first_entry(&sequence->list,
984 struct nfs_seqid, list);
985 rpc_wake_up_queued_task(&sequence->wait, next->task);
986 }
987 spin_unlock(&sequence->lock);
988}
989
990void nfs_free_seqid(struct nfs_seqid *seqid)
991{
992 nfs_release_seqid(seqid);
993 kfree(seqid);
994}
995
996/*
997 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
998 * failed with a seqid incrementing error -
999 * see comments nfs_fs.h:seqid_mutating_error()
1000 */
1001static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1002{
1003 BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
1004 switch (status) {
1005 case 0:
1006 break;
1007 case -NFS4ERR_BAD_SEQID:
1008 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1009 return;
1010 pr_warn_ratelimited("NFS: v4 server returned a bad"
1011 " sequence-id error on an"
1012 " unconfirmed sequence %p!\n",
1013 seqid->sequence);
1014 case -NFS4ERR_STALE_CLIENTID:
1015 case -NFS4ERR_STALE_STATEID:
1016 case -NFS4ERR_BAD_STATEID:
1017 case -NFS4ERR_BADXDR:
1018 case -NFS4ERR_RESOURCE:
1019 case -NFS4ERR_NOFILEHANDLE:
1020 /* Non-seqid mutating errors */
1021 return;
1022 };
1023 /*
1024 * Note: no locking needed as we are guaranteed to be first
1025 * on the sequence list
1026 */
1027 seqid->sequence->counter++;
1028}
1029
1030void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1031{
1032 struct nfs4_state_owner *sp = container_of(seqid->sequence,
1033 struct nfs4_state_owner, so_seqid);
1034 struct nfs_server *server = sp->so_server;
1035
1036 if (status == -NFS4ERR_BAD_SEQID)
1037 nfs4_drop_state_owner(sp);
1038 if (!nfs4_has_session(server->nfs_client))
1039 nfs_increment_seqid(status, seqid);
1040}
1041
1042/*
1043 * Increment the seqid if the LOCK/LOCKU succeeded, or
1044 * failed with a seqid incrementing error -
1045 * see comments nfs_fs.h:seqid_mutating_error()
1046 */
1047void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1048{
1049 nfs_increment_seqid(status, seqid);
1050}
1051
1052int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1053{
1054 struct nfs_seqid_counter *sequence = seqid->sequence;
1055 int status = 0;
1056
1057 spin_lock(&sequence->lock);
1058 seqid->task = task;
1059 if (list_empty(&seqid->list))
1060 list_add_tail(&seqid->list, &sequence->list);
1061 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1062 goto unlock;
1063 rpc_sleep_on(&sequence->wait, task, NULL);
1064 status = -EAGAIN;
1065unlock:
1066 spin_unlock(&sequence->lock);
1067 return status;
1068}
1069
1070static int nfs4_run_state_manager(void *);
1071
1072static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1073{
1074 smp_mb__before_clear_bit();
1075 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1076 smp_mb__after_clear_bit();
1077 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1078 rpc_wake_up(&clp->cl_rpcwaitq);
1079}
1080
1081/*
1082 * Schedule the nfs_client asynchronous state management routine
1083 */
1084void nfs4_schedule_state_manager(struct nfs_client *clp)
1085{
1086 struct task_struct *task;
1087 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1088
1089 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1090 return;
1091 __module_get(THIS_MODULE);
1092 atomic_inc(&clp->cl_count);
1093
1094 /* The rcu_read_lock() is not strictly necessary, as the state
1095 * manager is the only thread that ever changes the rpc_xprt
1096 * after it's initialized. At this point, we're single threaded. */
1097 rcu_read_lock();
1098 snprintf(buf, sizeof(buf), "%s-manager",
1099 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1100 rcu_read_unlock();
1101 task = kthread_run(nfs4_run_state_manager, clp, buf);
1102 if (IS_ERR(task)) {
1103 printk(KERN_ERR "%s: kthread_run: %ld\n",
1104 __func__, PTR_ERR(task));
1105 nfs4_clear_state_manager_bit(clp);
1106 nfs_put_client(clp);
1107 module_put(THIS_MODULE);
1108 }
1109}
1110
1111/*
1112 * Schedule a lease recovery attempt
1113 */
1114void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1115{
1116 if (!clp)
1117 return;
1118 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1119 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1120 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1121 clp->cl_hostname);
1122 nfs4_schedule_state_manager(clp);
1123}
1124EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1125
1126/*
1127 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1128 * @clp: client to process
1129 *
1130 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1131 * resend of the SETCLIENTID and hence re-establish the
1132 * callback channel. Then return all existing delegations.
1133 */
1134static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1135{
1136 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1137 nfs_expire_all_delegations(clp);
1138 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1139 clp->cl_hostname);
1140}
1141
1142void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1143{
1144 nfs40_handle_cb_pathdown(clp);
1145 nfs4_schedule_state_manager(clp);
1146}
1147
1148static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1149{
1150
1151 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1152 /* Don't recover state that expired before the reboot */
1153 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1154 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1155 return 0;
1156 }
1157 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1158 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1159 return 1;
1160}
1161
1162static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1163{
1164 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1165 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1166 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1167 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1168 return 1;
1169}
1170
1171void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1172{
1173 struct nfs_client *clp = server->nfs_client;
1174
1175 nfs4_state_mark_reclaim_nograce(clp, state);
1176 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1177 clp->cl_hostname);
1178 nfs4_schedule_state_manager(clp);
1179}
1180EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1181
1182void nfs_inode_find_state_and_recover(struct inode *inode,
1183 const nfs4_stateid *stateid)
1184{
1185 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1186 struct nfs_inode *nfsi = NFS_I(inode);
1187 struct nfs_open_context *ctx;
1188 struct nfs4_state *state;
1189 bool found = false;
1190
1191 spin_lock(&inode->i_lock);
1192 list_for_each_entry(ctx, &nfsi->open_files, list) {
1193 state = ctx->state;
1194 if (state == NULL)
1195 continue;
1196 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1197 continue;
1198 if (!nfs4_stateid_match(&state->stateid, stateid))
1199 continue;
1200 nfs4_state_mark_reclaim_nograce(clp, state);
1201 found = true;
1202 }
1203 spin_unlock(&inode->i_lock);
1204 if (found)
1205 nfs4_schedule_state_manager(clp);
1206}
1207
1208
1209static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1210{
1211 struct inode *inode = state->inode;
1212 struct nfs_inode *nfsi = NFS_I(inode);
1213 struct file_lock *fl;
1214 int status = 0;
1215
1216 if (inode->i_flock == NULL)
1217 return 0;
1218
1219 /* Guard against delegation returns and new lock/unlock calls */
1220 down_write(&nfsi->rwsem);
1221 /* Protect inode->i_flock using the BKL */
1222 lock_flocks();
1223 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1224 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1225 continue;
1226 if (nfs_file_open_context(fl->fl_file)->state != state)
1227 continue;
1228 unlock_flocks();
1229 status = ops->recover_lock(state, fl);
1230 switch (status) {
1231 case 0:
1232 break;
1233 case -ESTALE:
1234 case -NFS4ERR_ADMIN_REVOKED:
1235 case -NFS4ERR_STALE_STATEID:
1236 case -NFS4ERR_BAD_STATEID:
1237 case -NFS4ERR_EXPIRED:
1238 case -NFS4ERR_NO_GRACE:
1239 case -NFS4ERR_STALE_CLIENTID:
1240 case -NFS4ERR_BADSESSION:
1241 case -NFS4ERR_BADSLOT:
1242 case -NFS4ERR_BAD_HIGH_SLOT:
1243 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1244 goto out;
1245 default:
1246 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1247 "Zeroing state\n", __func__, status);
1248 case -ENOMEM:
1249 case -NFS4ERR_DENIED:
1250 case -NFS4ERR_RECLAIM_BAD:
1251 case -NFS4ERR_RECLAIM_CONFLICT:
1252 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1253 status = 0;
1254 }
1255 lock_flocks();
1256 }
1257 unlock_flocks();
1258out:
1259 up_write(&nfsi->rwsem);
1260 return status;
1261}
1262
1263static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1264{
1265 struct nfs4_state *state;
1266 struct nfs4_lock_state *lock;
1267 int status = 0;
1268
1269 /* Note: we rely on the sp->so_states list being ordered
1270 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1271 * states first.
1272 * This is needed to ensure that the server won't give us any
1273 * read delegations that we have to return if, say, we are
1274 * recovering after a network partition or a reboot from a
1275 * server that doesn't support a grace period.
1276 */
1277restart:
1278 spin_lock(&sp->so_lock);
1279 list_for_each_entry(state, &sp->so_states, open_states) {
1280 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1281 continue;
1282 if (state->state == 0)
1283 continue;
1284 atomic_inc(&state->count);
1285 spin_unlock(&sp->so_lock);
1286 status = ops->recover_open(sp, state);
1287 if (status >= 0) {
1288 status = nfs4_reclaim_locks(state, ops);
1289 if (status >= 0) {
1290 spin_lock(&state->state_lock);
1291 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1292 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1293 pr_warn_ratelimited("NFS: "
1294 "%s: Lock reclaim "
1295 "failed!\n", __func__);
1296 }
1297 spin_unlock(&state->state_lock);
1298 nfs4_put_open_state(state);
1299 goto restart;
1300 }
1301 }
1302 switch (status) {
1303 default:
1304 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1305 "Zeroing state\n", __func__, status);
1306 case -ENOENT:
1307 case -ENOMEM:
1308 case -ESTALE:
1309 /*
1310 * Open state on this file cannot be recovered
1311 * All we can do is revert to using the zero stateid.
1312 */
1313 memset(&state->stateid, 0,
1314 sizeof(state->stateid));
1315 /* Mark the file as being 'closed' */
1316 state->state = 0;
1317 break;
1318 case -EKEYEXPIRED:
1319 /*
1320 * User RPCSEC_GSS context has expired.
1321 * We cannot recover this stateid now, so
1322 * skip it and allow recovery thread to
1323 * proceed.
1324 */
1325 break;
1326 case -NFS4ERR_ADMIN_REVOKED:
1327 case -NFS4ERR_STALE_STATEID:
1328 case -NFS4ERR_BAD_STATEID:
1329 case -NFS4ERR_RECLAIM_BAD:
1330 case -NFS4ERR_RECLAIM_CONFLICT:
1331 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1332 break;
1333 case -NFS4ERR_EXPIRED:
1334 case -NFS4ERR_NO_GRACE:
1335 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1336 case -NFS4ERR_STALE_CLIENTID:
1337 case -NFS4ERR_BADSESSION:
1338 case -NFS4ERR_BADSLOT:
1339 case -NFS4ERR_BAD_HIGH_SLOT:
1340 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1341 goto out_err;
1342 }
1343 nfs4_put_open_state(state);
1344 goto restart;
1345 }
1346 spin_unlock(&sp->so_lock);
1347 return 0;
1348out_err:
1349 nfs4_put_open_state(state);
1350 return status;
1351}
1352
1353static void nfs4_clear_open_state(struct nfs4_state *state)
1354{
1355 struct nfs4_lock_state *lock;
1356
1357 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1358 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1359 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1360 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1361 spin_lock(&state->state_lock);
1362 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1363 lock->ls_seqid.flags = 0;
1364 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1365 }
1366 spin_unlock(&state->state_lock);
1367}
1368
1369static void nfs4_reset_seqids(struct nfs_server *server,
1370 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1371{
1372 struct nfs_client *clp = server->nfs_client;
1373 struct nfs4_state_owner *sp;
1374 struct rb_node *pos;
1375 struct nfs4_state *state;
1376
1377 spin_lock(&clp->cl_lock);
1378 for (pos = rb_first(&server->state_owners);
1379 pos != NULL;
1380 pos = rb_next(pos)) {
1381 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1382 sp->so_seqid.flags = 0;
1383 spin_lock(&sp->so_lock);
1384 list_for_each_entry(state, &sp->so_states, open_states) {
1385 if (mark_reclaim(clp, state))
1386 nfs4_clear_open_state(state);
1387 }
1388 spin_unlock(&sp->so_lock);
1389 }
1390 spin_unlock(&clp->cl_lock);
1391}
1392
1393static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1394 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1395{
1396 struct nfs_server *server;
1397
1398 rcu_read_lock();
1399 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1400 nfs4_reset_seqids(server, mark_reclaim);
1401 rcu_read_unlock();
1402}
1403
1404static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1405{
1406 /* Mark all delegations for reclaim */
1407 nfs_delegation_mark_reclaim(clp);
1408 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1409}
1410
1411static void nfs4_reclaim_complete(struct nfs_client *clp,
1412 const struct nfs4_state_recovery_ops *ops)
1413{
1414 /* Notify the server we're done reclaiming our state */
1415 if (ops->reclaim_complete)
1416 (void)ops->reclaim_complete(clp);
1417}
1418
1419static void nfs4_clear_reclaim_server(struct nfs_server *server)
1420{
1421 struct nfs_client *clp = server->nfs_client;
1422 struct nfs4_state_owner *sp;
1423 struct rb_node *pos;
1424 struct nfs4_state *state;
1425
1426 spin_lock(&clp->cl_lock);
1427 for (pos = rb_first(&server->state_owners);
1428 pos != NULL;
1429 pos = rb_next(pos)) {
1430 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1431 spin_lock(&sp->so_lock);
1432 list_for_each_entry(state, &sp->so_states, open_states) {
1433 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1434 &state->flags))
1435 continue;
1436 nfs4_state_mark_reclaim_nograce(clp, state);
1437 }
1438 spin_unlock(&sp->so_lock);
1439 }
1440 spin_unlock(&clp->cl_lock);
1441}
1442
1443static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1444{
1445 struct nfs_server *server;
1446
1447 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1448 return 0;
1449
1450 rcu_read_lock();
1451 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1452 nfs4_clear_reclaim_server(server);
1453 rcu_read_unlock();
1454
1455 nfs_delegation_reap_unclaimed(clp);
1456 return 1;
1457}
1458
1459static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1460{
1461 if (!nfs4_state_clear_reclaim_reboot(clp))
1462 return;
1463 nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1464}
1465
1466static void nfs_delegation_clear_all(struct nfs_client *clp)
1467{
1468 nfs_delegation_mark_reclaim(clp);
1469 nfs_delegation_reap_unclaimed(clp);
1470}
1471
1472static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1473{
1474 nfs_delegation_clear_all(clp);
1475 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1476}
1477
1478static void nfs4_warn_keyexpired(const char *s)
1479{
1480 printk_ratelimited(KERN_WARNING "Error: state manager"
1481 " encountered RPCSEC_GSS session"
1482 " expired against NFSv4 server %s.\n",
1483 s);
1484}
1485
1486static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1487{
1488 switch (error) {
1489 case 0:
1490 break;
1491 case -NFS4ERR_CB_PATH_DOWN:
1492 nfs40_handle_cb_pathdown(clp);
1493 break;
1494 case -NFS4ERR_NO_GRACE:
1495 nfs4_state_end_reclaim_reboot(clp);
1496 break;
1497 case -NFS4ERR_STALE_CLIENTID:
1498 case -NFS4ERR_LEASE_MOVED:
1499 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1500 nfs4_state_clear_reclaim_reboot(clp);
1501 nfs4_state_start_reclaim_reboot(clp);
1502 break;
1503 case -NFS4ERR_EXPIRED:
1504 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1505 nfs4_state_start_reclaim_nograce(clp);
1506 break;
1507 case -NFS4ERR_BADSESSION:
1508 case -NFS4ERR_BADSLOT:
1509 case -NFS4ERR_BAD_HIGH_SLOT:
1510 case -NFS4ERR_DEADSESSION:
1511 case -NFS4ERR_SEQ_FALSE_RETRY:
1512 case -NFS4ERR_SEQ_MISORDERED:
1513 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1514 /* Zero session reset errors */
1515 break;
1516 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1517 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1518 break;
1519 case -EKEYEXPIRED:
1520 /* Nothing we can do */
1521 nfs4_warn_keyexpired(clp->cl_hostname);
1522 break;
1523 default:
1524 dprintk("%s: failed to handle error %d for server %s\n",
1525 __func__, error, clp->cl_hostname);
1526 return error;
1527 }
1528 dprintk("%s: handled error %d for server %s\n", __func__, error,
1529 clp->cl_hostname);
1530 return 0;
1531}
1532
1533static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1534{
1535 struct nfs4_state_owner *sp;
1536 struct nfs_server *server;
1537 struct rb_node *pos;
1538 int status = 0;
1539
1540restart:
1541 rcu_read_lock();
1542 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1543 nfs4_purge_state_owners(server);
1544 spin_lock(&clp->cl_lock);
1545 for (pos = rb_first(&server->state_owners);
1546 pos != NULL;
1547 pos = rb_next(pos)) {
1548 sp = rb_entry(pos,
1549 struct nfs4_state_owner, so_server_node);
1550 if (!test_and_clear_bit(ops->owner_flag_bit,
1551 &sp->so_flags))
1552 continue;
1553 atomic_inc(&sp->so_count);
1554 spin_unlock(&clp->cl_lock);
1555 rcu_read_unlock();
1556
1557 status = nfs4_reclaim_open_state(sp, ops);
1558 if (status < 0) {
1559 set_bit(ops->owner_flag_bit, &sp->so_flags);
1560 nfs4_put_state_owner(sp);
1561 return nfs4_recovery_handle_error(clp, status);
1562 }
1563
1564 nfs4_put_state_owner(sp);
1565 goto restart;
1566 }
1567 spin_unlock(&clp->cl_lock);
1568 }
1569 rcu_read_unlock();
1570 return status;
1571}
1572
1573static int nfs4_check_lease(struct nfs_client *clp)
1574{
1575 struct rpc_cred *cred;
1576 const struct nfs4_state_maintenance_ops *ops =
1577 clp->cl_mvops->state_renewal_ops;
1578 int status;
1579
1580 /* Is the client already known to have an expired lease? */
1581 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1582 return 0;
1583 spin_lock(&clp->cl_lock);
1584 cred = ops->get_state_renewal_cred_locked(clp);
1585 spin_unlock(&clp->cl_lock);
1586 if (cred == NULL) {
1587 cred = nfs4_get_setclientid_cred(clp);
1588 status = -ENOKEY;
1589 if (cred == NULL)
1590 goto out;
1591 }
1592 status = ops->renew_lease(clp, cred);
1593 put_rpccred(cred);
1594out:
1595 return nfs4_recovery_handle_error(clp, status);
1596}
1597
1598/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1599 * on EXCHANGE_ID for v4.1
1600 */
1601static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1602{
1603 switch (status) {
1604 case -NFS4ERR_SEQ_MISORDERED:
1605 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1606 return -ESERVERFAULT;
1607 /* Lease confirmation error: retry after purging the lease */
1608 ssleep(1);
1609 case -NFS4ERR_CLID_INUSE:
1610 case -NFS4ERR_STALE_CLIENTID:
1611 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1612 break;
1613 case -EACCES:
1614 if (clp->cl_machine_cred == NULL)
1615 return -EACCES;
1616 /* Handle case where the user hasn't set up machine creds */
1617 nfs4_clear_machine_cred(clp);
1618 case -NFS4ERR_DELAY:
1619 case -ETIMEDOUT:
1620 case -EAGAIN:
1621 ssleep(1);
1622 break;
1623
1624 case -NFS4ERR_MINOR_VERS_MISMATCH:
1625 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1626 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1627 dprintk("%s: exit with error %d for server %s\n",
1628 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1629 return -EPROTONOSUPPORT;
1630 case -EKEYEXPIRED:
1631 nfs4_warn_keyexpired(clp->cl_hostname);
1632 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1633 * in nfs4_exchange_id */
1634 default:
1635 dprintk("%s: exit with error %d for server %s\n", __func__,
1636 status, clp->cl_hostname);
1637 return status;
1638 }
1639 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1640 dprintk("%s: handled error %d for server %s\n", __func__, status,
1641 clp->cl_hostname);
1642 return 0;
1643}
1644
1645static int nfs4_reclaim_lease(struct nfs_client *clp)
1646{
1647 struct rpc_cred *cred;
1648 const struct nfs4_state_recovery_ops *ops =
1649 clp->cl_mvops->reboot_recovery_ops;
1650 int status;
1651
1652 cred = ops->get_clid_cred(clp);
1653 if (cred == NULL)
1654 return -ENOENT;
1655 status = ops->establish_clid(clp, cred);
1656 put_rpccred(cred);
1657 if (status != 0)
1658 return nfs4_handle_reclaim_lease_error(clp, status);
1659 return 0;
1660}
1661
1662#ifdef CONFIG_NFS_V4_1
1663void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
1664{
1665 struct nfs_client *clp = session->clp;
1666
1667 switch (err) {
1668 default:
1669 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1670 break;
1671 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1672 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1673 }
1674 nfs4_schedule_lease_recovery(clp);
1675}
1676EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1677
1678void nfs41_handle_recall_slot(struct nfs_client *clp)
1679{
1680 set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1681 dprintk("%s: scheduling slot recall for server %s\n", __func__,
1682 clp->cl_hostname);
1683 nfs4_schedule_state_manager(clp);
1684}
1685
1686static void nfs4_reset_all_state(struct nfs_client *clp)
1687{
1688 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1689 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1690 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1691 nfs4_state_start_reclaim_nograce(clp);
1692 dprintk("%s: scheduling reset of all state for server %s!\n",
1693 __func__, clp->cl_hostname);
1694 nfs4_schedule_state_manager(clp);
1695 }
1696}
1697
1698static void nfs41_handle_server_reboot(struct nfs_client *clp)
1699{
1700 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1701 nfs4_state_start_reclaim_reboot(clp);
1702 dprintk("%s: server %s rebooted!\n", __func__,
1703 clp->cl_hostname);
1704 nfs4_schedule_state_manager(clp);
1705 }
1706}
1707
1708static void nfs41_handle_state_revoked(struct nfs_client *clp)
1709{
1710 nfs4_reset_all_state(clp);
1711 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
1712}
1713
1714static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1715{
1716 /* This will need to handle layouts too */
1717 nfs_expire_all_delegations(clp);
1718 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
1719 clp->cl_hostname);
1720}
1721
1722static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
1723{
1724 nfs_expire_all_delegations(clp);
1725 if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1726 nfs4_schedule_state_manager(clp);
1727 dprintk("%s: server %s declared a backchannel fault\n", __func__,
1728 clp->cl_hostname);
1729}
1730
1731static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1732{
1733 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1734 &clp->cl_state) == 0)
1735 nfs4_schedule_state_manager(clp);
1736}
1737
1738void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1739{
1740 if (!flags)
1741 return;
1742
1743 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
1744 __func__, clp->cl_hostname, clp->cl_clientid, flags);
1745
1746 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1747 nfs41_handle_server_reboot(clp);
1748 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1749 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1750 SEQ4_STATUS_ADMIN_STATE_REVOKED |
1751 SEQ4_STATUS_LEASE_MOVED))
1752 nfs41_handle_state_revoked(clp);
1753 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1754 nfs41_handle_recallable_state_revoked(clp);
1755 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
1756 nfs41_handle_backchannel_fault(clp);
1757 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1758 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1759 nfs41_handle_cb_path_down(clp);
1760}
1761
1762static int nfs4_reset_session(struct nfs_client *clp)
1763{
1764 struct rpc_cred *cred;
1765 int status;
1766
1767 nfs4_begin_drain_session(clp);
1768 cred = nfs4_get_exchange_id_cred(clp);
1769 status = nfs4_proc_destroy_session(clp->cl_session, cred);
1770 if (status && status != -NFS4ERR_BADSESSION &&
1771 status != -NFS4ERR_DEADSESSION) {
1772 status = nfs4_recovery_handle_error(clp, status);
1773 goto out;
1774 }
1775
1776 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1777 status = nfs4_proc_create_session(clp, cred);
1778 if (status) {
1779 dprintk("%s: session reset failed with status %d for server %s!\n",
1780 __func__, status, clp->cl_hostname);
1781 status = nfs4_handle_reclaim_lease_error(clp, status);
1782 goto out;
1783 }
1784 nfs41_finish_session_reset(clp);
1785 dprintk("%s: session reset was successful for server %s!\n",
1786 __func__, clp->cl_hostname);
1787out:
1788 if (cred)
1789 put_rpccred(cred);
1790 return status;
1791}
1792
1793static int nfs4_recall_slot(struct nfs_client *clp)
1794{
1795 struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1796 struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1797 struct nfs4_slot *new, *old;
1798 int i;
1799
1800 nfs4_begin_drain_session(clp);
1801 new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1802 GFP_NOFS);
1803 if (!new)
1804 return -ENOMEM;
1805
1806 spin_lock(&fc_tbl->slot_tbl_lock);
1807 for (i = 0; i < fc_tbl->target_max_slots; i++)
1808 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1809 old = fc_tbl->slots;
1810 fc_tbl->slots = new;
1811 fc_tbl->max_slots = fc_tbl->target_max_slots;
1812 fc_tbl->target_max_slots = 0;
1813 fc_attrs->max_reqs = fc_tbl->max_slots;
1814 spin_unlock(&fc_tbl->slot_tbl_lock);
1815
1816 kfree(old);
1817 nfs4_end_drain_session(clp);
1818 return 0;
1819}
1820
1821static int nfs4_bind_conn_to_session(struct nfs_client *clp)
1822{
1823 struct rpc_cred *cred;
1824 int ret;
1825
1826 nfs4_begin_drain_session(clp);
1827 cred = nfs4_get_exchange_id_cred(clp);
1828 ret = nfs4_proc_bind_conn_to_session(clp, cred);
1829 if (cred)
1830 put_rpccred(cred);
1831 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1832 switch (ret) {
1833 case 0:
1834 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
1835 __func__, clp->cl_hostname);
1836 break;
1837 case -NFS4ERR_DELAY:
1838 ssleep(1);
1839 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1840 break;
1841 default:
1842 return nfs4_recovery_handle_error(clp, ret);
1843 }
1844 return 0;
1845}
1846#else /* CONFIG_NFS_V4_1 */
1847static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1848static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1849static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1850
1851static int nfs4_bind_conn_to_session(struct nfs_client *clp)
1852{
1853 return 0;
1854}
1855#endif /* CONFIG_NFS_V4_1 */
1856
1857static void nfs4_state_manager(struct nfs_client *clp)
1858{
1859 int status = 0;
1860
1861 /* Ensure exclusive access to NFSv4 state */
1862 do {
1863 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
1864 status = nfs4_reclaim_lease(clp);
1865 if (status < 0)
1866 goto out_error;
1867 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1868 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1869 }
1870
1871 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1872 /* We're going to have to re-establish a clientid */
1873 status = nfs4_reclaim_lease(clp);
1874 if (status < 0)
1875 goto out_error;
1876 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1877 continue;
1878 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1879
1880 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1881 &clp->cl_state))
1882 nfs4_state_start_reclaim_nograce(clp);
1883 else
1884 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1885 &clp->cl_state);
1886
1887 pnfs_destroy_all_layouts(clp);
1888 }
1889
1890 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1891 status = nfs4_check_lease(clp);
1892 if (status < 0)
1893 goto out_error;
1894 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1895 continue;
1896 }
1897
1898 /* Initialize or reset the session */
1899 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1900 && nfs4_has_session(clp)) {
1901 status = nfs4_reset_session(clp);
1902 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1903 continue;
1904 if (status < 0)
1905 goto out_error;
1906 }
1907
1908 /* Send BIND_CONN_TO_SESSION */
1909 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1910 &clp->cl_state) && nfs4_has_session(clp)) {
1911 status = nfs4_bind_conn_to_session(clp);
1912 if (status < 0)
1913 goto out_error;
1914 continue;
1915 }
1916
1917 /* First recover reboot state... */
1918 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1919 status = nfs4_do_reclaim(clp,
1920 clp->cl_mvops->reboot_recovery_ops);
1921 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1922 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1923 continue;
1924 nfs4_state_end_reclaim_reboot(clp);
1925 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1926 continue;
1927 if (status < 0)
1928 goto out_error;
1929 }
1930
1931 /* Now recover expired state... */
1932 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1933 status = nfs4_do_reclaim(clp,
1934 clp->cl_mvops->nograce_recovery_ops);
1935 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1936 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1937 test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1938 continue;
1939 if (status < 0)
1940 goto out_error;
1941 }
1942
1943 nfs4_end_drain_session(clp);
1944 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1945 nfs_client_return_marked_delegations(clp);
1946 continue;
1947 }
1948 /* Recall session slots */
1949 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1950 && nfs4_has_session(clp)) {
1951 status = nfs4_recall_slot(clp);
1952 if (status < 0)
1953 goto out_error;
1954 continue;
1955 }
1956
1957
1958 nfs4_clear_state_manager_bit(clp);
1959 /* Did we race with an attempt to give us more work? */
1960 if (clp->cl_state == 0)
1961 break;
1962 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1963 break;
1964 } while (atomic_read(&clp->cl_count) > 1);
1965 return;
1966out_error:
1967 pr_warn_ratelimited("NFS: state manager failed on NFSv4 server %s"
1968 " with error %d\n", clp->cl_hostname, -status);
1969 nfs4_end_drain_session(clp);
1970 nfs4_clear_state_manager_bit(clp);
1971}
1972
1973static int nfs4_run_state_manager(void *ptr)
1974{
1975 struct nfs_client *clp = ptr;
1976
1977 allow_signal(SIGKILL);
1978 nfs4_state_manager(clp);
1979 nfs_put_client(clp);
1980 module_put_and_exit(0);
1981 return 0;
1982}
1983
1984/*
1985 * Local variables:
1986 * c-basic-offset: 8
1987 * End:
1988 */