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