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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/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 OPENOWNER_POOL_SIZE 8 | |
61 | ||
62 | const nfs4_stateid zero_stateid; | |
63 | ||
64 | static LIST_HEAD(nfs4_clientid_list); | |
65 | ||
66 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) | |
67 | { | |
68 | struct nfs4_setclientid_res clid = { | |
69 | .clientid = clp->cl_clientid, | |
70 | .confirm = clp->cl_confirm, | |
71 | }; | |
72 | unsigned short port; | |
73 | int status; | |
74 | ||
75 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) | |
76 | goto do_confirm; | |
77 | port = nfs_callback_tcpport; | |
78 | if (clp->cl_addr.ss_family == AF_INET6) | |
79 | port = nfs_callback_tcpport6; | |
80 | ||
81 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); | |
82 | if (status != 0) | |
83 | goto out; | |
84 | clp->cl_clientid = clid.clientid; | |
85 | clp->cl_confirm = clid.confirm; | |
86 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
87 | do_confirm: | |
88 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); | |
89 | if (status != 0) | |
90 | goto out; | |
91 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
92 | nfs4_schedule_state_renewal(clp); | |
93 | out: | |
94 | return status; | |
95 | } | |
96 | ||
97 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) | |
98 | { | |
99 | struct rpc_cred *cred = NULL; | |
100 | ||
101 | if (clp->cl_machine_cred != NULL) | |
102 | cred = get_rpccred(clp->cl_machine_cred); | |
103 | return cred; | |
104 | } | |
105 | ||
106 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
107 | { | |
108 | struct rpc_cred *cred; | |
109 | ||
110 | spin_lock(&clp->cl_lock); | |
111 | cred = clp->cl_machine_cred; | |
112 | clp->cl_machine_cred = NULL; | |
113 | spin_unlock(&clp->cl_lock); | |
114 | if (cred != NULL) | |
115 | put_rpccred(cred); | |
116 | } | |
117 | ||
118 | static struct rpc_cred * | |
119 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
120 | { | |
121 | struct rpc_cred *cred = NULL; | |
122 | struct nfs4_state_owner *sp; | |
123 | struct rb_node *pos; | |
124 | ||
125 | for (pos = rb_first(&server->state_owners); | |
126 | pos != NULL; | |
127 | pos = rb_next(pos)) { | |
128 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
129 | if (list_empty(&sp->so_states)) | |
130 | continue; | |
131 | cred = get_rpccred(sp->so_cred); | |
132 | break; | |
133 | } | |
134 | return cred; | |
135 | } | |
136 | ||
137 | /** | |
138 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
139 | * @clp: client state handle | |
140 | * | |
141 | * Returns an rpc_cred with reference count bumped, or NULL. | |
142 | * Caller must hold clp->cl_lock. | |
143 | */ | |
144 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
145 | { | |
146 | struct rpc_cred *cred = NULL; | |
147 | struct nfs_server *server; | |
148 | ||
149 | rcu_read_lock(); | |
150 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
151 | cred = nfs4_get_renew_cred_server_locked(server); | |
152 | if (cred != NULL) | |
153 | break; | |
154 | } | |
155 | rcu_read_unlock(); | |
156 | return cred; | |
157 | } | |
158 | ||
159 | #if defined(CONFIG_NFS_V4_1) | |
160 | ||
161 | static int nfs41_setup_state_renewal(struct nfs_client *clp) | |
162 | { | |
163 | int status; | |
164 | struct nfs_fsinfo fsinfo; | |
165 | ||
166 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { | |
167 | nfs4_schedule_state_renewal(clp); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | status = nfs4_proc_get_lease_time(clp, &fsinfo); | |
172 | if (status == 0) { | |
173 | /* Update lease time and schedule renewal */ | |
174 | spin_lock(&clp->cl_lock); | |
175 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
176 | clp->cl_last_renewal = jiffies; | |
177 | spin_unlock(&clp->cl_lock); | |
178 | ||
179 | nfs4_schedule_state_renewal(clp); | |
180 | } | |
181 | ||
182 | return status; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Back channel returns NFS4ERR_DELAY for new requests when | |
187 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
188 | * is ended. | |
189 | */ | |
190 | static void nfs4_end_drain_session(struct nfs_client *clp) | |
191 | { | |
192 | struct nfs4_session *ses = clp->cl_session; | |
193 | struct nfs4_slot_table *tbl; | |
194 | int max_slots; | |
195 | ||
196 | if (ses == NULL) | |
197 | return; | |
198 | tbl = &ses->fc_slot_table; | |
199 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { | |
200 | spin_lock(&tbl->slot_tbl_lock); | |
201 | max_slots = tbl->max_slots; | |
202 | while (max_slots--) { | |
203 | if (rpc_wake_up_first(&tbl->slot_tbl_waitq, | |
204 | nfs4_set_task_privileged, | |
205 | NULL) == NULL) | |
206 | break; | |
207 | } | |
208 | spin_unlock(&tbl->slot_tbl_lock); | |
209 | } | |
210 | } | |
211 | ||
212 | static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) | |
213 | { | |
214 | spin_lock(&tbl->slot_tbl_lock); | |
215 | if (tbl->highest_used_slotid != -1) { | |
216 | INIT_COMPLETION(tbl->complete); | |
217 | spin_unlock(&tbl->slot_tbl_lock); | |
218 | return wait_for_completion_interruptible(&tbl->complete); | |
219 | } | |
220 | spin_unlock(&tbl->slot_tbl_lock); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static int nfs4_begin_drain_session(struct nfs_client *clp) | |
225 | { | |
226 | struct nfs4_session *ses = clp->cl_session; | |
227 | int ret = 0; | |
228 | ||
229 | set_bit(NFS4_SESSION_DRAINING, &ses->session_state); | |
230 | /* back channel */ | |
231 | ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); | |
232 | if (ret) | |
233 | return ret; | |
234 | /* fore channel */ | |
235 | return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); | |
236 | } | |
237 | ||
238 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) | |
239 | { | |
240 | int status; | |
241 | ||
242 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) | |
243 | goto do_confirm; | |
244 | nfs4_begin_drain_session(clp); | |
245 | status = nfs4_proc_exchange_id(clp, cred); | |
246 | if (status != 0) | |
247 | goto out; | |
248 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
249 | do_confirm: | |
250 | status = nfs4_proc_create_session(clp); | |
251 | if (status != 0) | |
252 | goto out; | |
253 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
254 | nfs41_setup_state_renewal(clp); | |
255 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
256 | out: | |
257 | return status; | |
258 | } | |
259 | ||
260 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) | |
261 | { | |
262 | struct rpc_cred *cred; | |
263 | ||
264 | spin_lock(&clp->cl_lock); | |
265 | cred = nfs4_get_machine_cred_locked(clp); | |
266 | spin_unlock(&clp->cl_lock); | |
267 | return cred; | |
268 | } | |
269 | ||
270 | #endif /* CONFIG_NFS_V4_1 */ | |
271 | ||
272 | static struct rpc_cred * | |
273 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
274 | { | |
275 | struct nfs_client *clp = server->nfs_client; | |
276 | struct rpc_cred *cred = NULL; | |
277 | struct nfs4_state_owner *sp; | |
278 | struct rb_node *pos; | |
279 | ||
280 | spin_lock(&clp->cl_lock); | |
281 | pos = rb_first(&server->state_owners); | |
282 | if (pos != NULL) { | |
283 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
284 | cred = get_rpccred(sp->so_cred); | |
285 | } | |
286 | spin_unlock(&clp->cl_lock); | |
287 | return cred; | |
288 | } | |
289 | ||
290 | /** | |
291 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
292 | * @clp: client state handle | |
293 | * | |
294 | * Returns an rpc_cred with reference count bumped, or NULL. | |
295 | */ | |
296 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
297 | { | |
298 | struct nfs_server *server; | |
299 | struct rpc_cred *cred; | |
300 | ||
301 | spin_lock(&clp->cl_lock); | |
302 | cred = nfs4_get_machine_cred_locked(clp); | |
303 | spin_unlock(&clp->cl_lock); | |
304 | if (cred != NULL) | |
305 | goto out; | |
306 | ||
307 | rcu_read_lock(); | |
308 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
309 | cred = nfs4_get_setclientid_cred_server(server); | |
310 | if (cred != NULL) | |
311 | break; | |
312 | } | |
313 | rcu_read_unlock(); | |
314 | ||
315 | out: | |
316 | return cred; | |
317 | } | |
318 | ||
319 | static struct nfs4_state_owner * | |
320 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) | |
321 | { | |
322 | struct rb_node **p = &server->state_owners.rb_node, | |
323 | *parent = NULL; | |
324 | struct nfs4_state_owner *sp; | |
325 | ||
326 | while (*p != NULL) { | |
327 | parent = *p; | |
328 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); | |
329 | ||
330 | if (cred < sp->so_cred) | |
331 | p = &parent->rb_left; | |
332 | else if (cred > sp->so_cred) | |
333 | p = &parent->rb_right; | |
334 | else { | |
335 | if (!list_empty(&sp->so_lru)) | |
336 | list_del_init(&sp->so_lru); | |
337 | atomic_inc(&sp->so_count); | |
338 | return sp; | |
339 | } | |
340 | } | |
341 | return NULL; | |
342 | } | |
343 | ||
344 | static struct nfs4_state_owner * | |
345 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) | |
346 | { | |
347 | struct nfs_server *server = new->so_server; | |
348 | struct rb_node **p = &server->state_owners.rb_node, | |
349 | *parent = NULL; | |
350 | struct nfs4_state_owner *sp; | |
351 | int err; | |
352 | ||
353 | while (*p != NULL) { | |
354 | parent = *p; | |
355 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); | |
356 | ||
357 | if (new->so_cred < sp->so_cred) | |
358 | p = &parent->rb_left; | |
359 | else if (new->so_cred > sp->so_cred) | |
360 | p = &parent->rb_right; | |
361 | else { | |
362 | if (!list_empty(&sp->so_lru)) | |
363 | list_del_init(&sp->so_lru); | |
364 | atomic_inc(&sp->so_count); | |
365 | return sp; | |
366 | } | |
367 | } | |
368 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); | |
369 | if (err) | |
370 | return ERR_PTR(err); | |
371 | rb_link_node(&new->so_server_node, parent, p); | |
372 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
373 | return new; | |
374 | } | |
375 | ||
376 | static void | |
377 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) | |
378 | { | |
379 | struct nfs_server *server = sp->so_server; | |
380 | ||
381 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
382 | rb_erase(&sp->so_server_node, &server->state_owners); | |
383 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); | |
384 | } | |
385 | ||
386 | static void | |
387 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
388 | { | |
389 | sc->flags = 0; | |
390 | sc->counter = 0; | |
391 | spin_lock_init(&sc->lock); | |
392 | INIT_LIST_HEAD(&sc->list); | |
393 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
394 | } | |
395 | ||
396 | static void | |
397 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
398 | { | |
399 | rpc_destroy_wait_queue(&sc->wait); | |
400 | } | |
401 | ||
402 | /* | |
403 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
404 | * create a new state_owner. | |
405 | * | |
406 | */ | |
407 | static struct nfs4_state_owner * | |
408 | nfs4_alloc_state_owner(struct nfs_server *server, | |
409 | struct rpc_cred *cred, | |
410 | gfp_t gfp_flags) | |
411 | { | |
412 | struct nfs4_state_owner *sp; | |
413 | ||
414 | sp = kzalloc(sizeof(*sp), gfp_flags); | |
415 | if (!sp) | |
416 | return NULL; | |
417 | sp->so_server = server; | |
418 | sp->so_cred = get_rpccred(cred); | |
419 | spin_lock_init(&sp->so_lock); | |
420 | INIT_LIST_HEAD(&sp->so_states); | |
421 | nfs4_init_seqid_counter(&sp->so_seqid); | |
422 | atomic_set(&sp->so_count, 1); | |
423 | INIT_LIST_HEAD(&sp->so_lru); | |
424 | return sp; | |
425 | } | |
426 | ||
427 | static void | |
428 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) | |
429 | { | |
430 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { | |
431 | struct nfs_server *server = sp->so_server; | |
432 | struct nfs_client *clp = server->nfs_client; | |
433 | ||
434 | spin_lock(&clp->cl_lock); | |
435 | rb_erase(&sp->so_server_node, &server->state_owners); | |
436 | RB_CLEAR_NODE(&sp->so_server_node); | |
437 | spin_unlock(&clp->cl_lock); | |
438 | } | |
439 | } | |
440 | ||
441 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) | |
442 | { | |
443 | nfs4_destroy_seqid_counter(&sp->so_seqid); | |
444 | put_rpccred(sp->so_cred); | |
445 | kfree(sp); | |
446 | } | |
447 | ||
448 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
449 | { | |
450 | struct nfs_client *clp = server->nfs_client; | |
451 | struct nfs4_state_owner *sp, *tmp; | |
452 | unsigned long time_min, time_max; | |
453 | LIST_HEAD(doomed); | |
454 | ||
455 | spin_lock(&clp->cl_lock); | |
456 | time_max = jiffies; | |
457 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
458 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
459 | /* NB: LRU is sorted so that oldest is at the head */ | |
460 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
461 | break; | |
462 | list_move(&sp->so_lru, &doomed); | |
463 | nfs4_remove_state_owner_locked(sp); | |
464 | } | |
465 | spin_unlock(&clp->cl_lock); | |
466 | ||
467 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
468 | list_del(&sp->so_lru); | |
469 | nfs4_free_state_owner(sp); | |
470 | } | |
471 | } | |
472 | ||
473 | /** | |
474 | * nfs4_get_state_owner - Look up a state owner given a credential | |
475 | * @server: nfs_server to search | |
476 | * @cred: RPC credential to match | |
477 | * | |
478 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
479 | */ | |
480 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
481 | struct rpc_cred *cred, | |
482 | gfp_t gfp_flags) | |
483 | { | |
484 | struct nfs_client *clp = server->nfs_client; | |
485 | struct nfs4_state_owner *sp, *new; | |
486 | ||
487 | spin_lock(&clp->cl_lock); | |
488 | sp = nfs4_find_state_owner_locked(server, cred); | |
489 | spin_unlock(&clp->cl_lock); | |
490 | if (sp != NULL) | |
491 | goto out; | |
492 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); | |
493 | if (new == NULL) | |
494 | goto out; | |
495 | do { | |
496 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
497 | break; | |
498 | spin_lock(&clp->cl_lock); | |
499 | sp = nfs4_insert_state_owner_locked(new); | |
500 | spin_unlock(&clp->cl_lock); | |
501 | } while (sp == ERR_PTR(-EAGAIN)); | |
502 | if (sp != new) | |
503 | nfs4_free_state_owner(new); | |
504 | out: | |
505 | nfs4_gc_state_owners(server); | |
506 | return sp; | |
507 | } | |
508 | ||
509 | /** | |
510 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
511 | * @sp: state owner data to release | |
512 | */ | |
513 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) | |
514 | { | |
515 | struct nfs_server *server = sp->so_server; | |
516 | struct nfs_client *clp = server->nfs_client; | |
517 | ||
518 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
519 | return; | |
520 | ||
521 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { | |
522 | sp->so_expires = jiffies; | |
523 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
524 | spin_unlock(&clp->cl_lock); | |
525 | } else { | |
526 | nfs4_remove_state_owner_locked(sp); | |
527 | spin_unlock(&clp->cl_lock); | |
528 | nfs4_free_state_owner(sp); | |
529 | } | |
530 | } | |
531 | ||
532 | /** | |
533 | * nfs4_purge_state_owners - Release all cached state owners | |
534 | * @server: nfs_server with cached state owners to release | |
535 | * | |
536 | * Called at umount time. Remaining state owners will be on | |
537 | * the LRU with ref count of zero. | |
538 | */ | |
539 | void nfs4_purge_state_owners(struct nfs_server *server) | |
540 | { | |
541 | struct nfs_client *clp = server->nfs_client; | |
542 | struct nfs4_state_owner *sp, *tmp; | |
543 | LIST_HEAD(doomed); | |
544 | ||
545 | spin_lock(&clp->cl_lock); | |
546 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
547 | list_move(&sp->so_lru, &doomed); | |
548 | nfs4_remove_state_owner_locked(sp); | |
549 | } | |
550 | spin_unlock(&clp->cl_lock); | |
551 | ||
552 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
553 | list_del(&sp->so_lru); | |
554 | nfs4_free_state_owner(sp); | |
555 | } | |
556 | } | |
557 | ||
558 | static struct nfs4_state * | |
559 | nfs4_alloc_open_state(void) | |
560 | { | |
561 | struct nfs4_state *state; | |
562 | ||
563 | state = kzalloc(sizeof(*state), GFP_NOFS); | |
564 | if (!state) | |
565 | return NULL; | |
566 | atomic_set(&state->count, 1); | |
567 | INIT_LIST_HEAD(&state->lock_states); | |
568 | spin_lock_init(&state->state_lock); | |
569 | seqlock_init(&state->seqlock); | |
570 | return state; | |
571 | } | |
572 | ||
573 | void | |
574 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) | |
575 | { | |
576 | if (state->state == fmode) | |
577 | return; | |
578 | /* NB! List reordering - see the reclaim code for why. */ | |
579 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
580 | if (fmode & FMODE_WRITE) | |
581 | list_move(&state->open_states, &state->owner->so_states); | |
582 | else | |
583 | list_move_tail(&state->open_states, &state->owner->so_states); | |
584 | } | |
585 | state->state = fmode; | |
586 | } | |
587 | ||
588 | static struct nfs4_state * | |
589 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
590 | { | |
591 | struct nfs_inode *nfsi = NFS_I(inode); | |
592 | struct nfs4_state *state; | |
593 | ||
594 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
595 | if (state->owner != owner) | |
596 | continue; | |
597 | if (atomic_inc_not_zero(&state->count)) | |
598 | return state; | |
599 | } | |
600 | return NULL; | |
601 | } | |
602 | ||
603 | static void | |
604 | nfs4_free_open_state(struct nfs4_state *state) | |
605 | { | |
606 | kfree(state); | |
607 | } | |
608 | ||
609 | struct nfs4_state * | |
610 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
611 | { | |
612 | struct nfs4_state *state, *new; | |
613 | struct nfs_inode *nfsi = NFS_I(inode); | |
614 | ||
615 | spin_lock(&inode->i_lock); | |
616 | state = __nfs4_find_state_byowner(inode, owner); | |
617 | spin_unlock(&inode->i_lock); | |
618 | if (state) | |
619 | goto out; | |
620 | new = nfs4_alloc_open_state(); | |
621 | spin_lock(&owner->so_lock); | |
622 | spin_lock(&inode->i_lock); | |
623 | state = __nfs4_find_state_byowner(inode, owner); | |
624 | if (state == NULL && new != NULL) { | |
625 | state = new; | |
626 | state->owner = owner; | |
627 | atomic_inc(&owner->so_count); | |
628 | list_add(&state->inode_states, &nfsi->open_states); | |
629 | ihold(inode); | |
630 | state->inode = inode; | |
631 | spin_unlock(&inode->i_lock); | |
632 | /* Note: The reclaim code dictates that we add stateless | |
633 | * and read-only stateids to the end of the list */ | |
634 | list_add_tail(&state->open_states, &owner->so_states); | |
635 | spin_unlock(&owner->so_lock); | |
636 | } else { | |
637 | spin_unlock(&inode->i_lock); | |
638 | spin_unlock(&owner->so_lock); | |
639 | if (new) | |
640 | nfs4_free_open_state(new); | |
641 | } | |
642 | out: | |
643 | return state; | |
644 | } | |
645 | ||
646 | void nfs4_put_open_state(struct nfs4_state *state) | |
647 | { | |
648 | struct inode *inode = state->inode; | |
649 | struct nfs4_state_owner *owner = state->owner; | |
650 | ||
651 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) | |
652 | return; | |
653 | spin_lock(&inode->i_lock); | |
654 | list_del(&state->inode_states); | |
655 | list_del(&state->open_states); | |
656 | spin_unlock(&inode->i_lock); | |
657 | spin_unlock(&owner->so_lock); | |
658 | iput(inode); | |
659 | nfs4_free_open_state(state); | |
660 | nfs4_put_state_owner(owner); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Close the current file. | |
665 | */ | |
666 | static void __nfs4_close(struct nfs4_state *state, | |
667 | fmode_t fmode, gfp_t gfp_mask, int wait) | |
668 | { | |
669 | struct nfs4_state_owner *owner = state->owner; | |
670 | int call_close = 0; | |
671 | fmode_t newstate; | |
672 | ||
673 | atomic_inc(&owner->so_count); | |
674 | /* Protect against nfs4_find_state() */ | |
675 | spin_lock(&owner->so_lock); | |
676 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { | |
677 | case FMODE_READ: | |
678 | state->n_rdonly--; | |
679 | break; | |
680 | case FMODE_WRITE: | |
681 | state->n_wronly--; | |
682 | break; | |
683 | case FMODE_READ|FMODE_WRITE: | |
684 | state->n_rdwr--; | |
685 | } | |
686 | newstate = FMODE_READ|FMODE_WRITE; | |
687 | if (state->n_rdwr == 0) { | |
688 | if (state->n_rdonly == 0) { | |
689 | newstate &= ~FMODE_READ; | |
690 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); | |
691 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
692 | } | |
693 | if (state->n_wronly == 0) { | |
694 | newstate &= ~FMODE_WRITE; | |
695 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); | |
696 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
697 | } | |
698 | if (newstate == 0) | |
699 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
700 | } | |
701 | nfs4_state_set_mode_locked(state, newstate); | |
702 | spin_unlock(&owner->so_lock); | |
703 | ||
704 | if (!call_close) { | |
705 | nfs4_put_open_state(state); | |
706 | nfs4_put_state_owner(owner); | |
707 | } else { | |
708 | bool roc = pnfs_roc(state->inode); | |
709 | ||
710 | nfs4_do_close(state, gfp_mask, wait, roc); | |
711 | } | |
712 | } | |
713 | ||
714 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) | |
715 | { | |
716 | __nfs4_close(state, fmode, GFP_NOFS, 0); | |
717 | } | |
718 | ||
719 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) | |
720 | { | |
721 | __nfs4_close(state, fmode, GFP_KERNEL, 1); | |
722 | } | |
723 | ||
724 | /* | |
725 | * Search the state->lock_states for an existing lock_owner | |
726 | * that is compatible with current->files | |
727 | */ | |
728 | static struct nfs4_lock_state * | |
729 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) | |
730 | { | |
731 | struct nfs4_lock_state *pos; | |
732 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
733 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) | |
734 | continue; | |
735 | switch (pos->ls_owner.lo_type) { | |
736 | case NFS4_POSIX_LOCK_TYPE: | |
737 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
738 | continue; | |
739 | break; | |
740 | case NFS4_FLOCK_LOCK_TYPE: | |
741 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
742 | continue; | |
743 | } | |
744 | atomic_inc(&pos->ls_count); | |
745 | return pos; | |
746 | } | |
747 | return NULL; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Return a compatible lock_state. If no initialized lock_state structure | |
752 | * exists, return an uninitialized one. | |
753 | * | |
754 | */ | |
755 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) | |
756 | { | |
757 | struct nfs4_lock_state *lsp; | |
758 | struct nfs_server *server = state->owner->so_server; | |
759 | ||
760 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); | |
761 | if (lsp == NULL) | |
762 | return NULL; | |
763 | nfs4_init_seqid_counter(&lsp->ls_seqid); | |
764 | atomic_set(&lsp->ls_count, 1); | |
765 | lsp->ls_state = state; | |
766 | lsp->ls_owner.lo_type = type; | |
767 | switch (lsp->ls_owner.lo_type) { | |
768 | case NFS4_FLOCK_LOCK_TYPE: | |
769 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
770 | break; | |
771 | case NFS4_POSIX_LOCK_TYPE: | |
772 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
773 | break; | |
774 | default: | |
775 | goto out_free; | |
776 | } | |
777 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); | |
778 | if (lsp->ls_seqid.owner_id < 0) | |
779 | goto out_free; | |
780 | INIT_LIST_HEAD(&lsp->ls_locks); | |
781 | return lsp; | |
782 | out_free: | |
783 | kfree(lsp); | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) | |
788 | { | |
789 | struct nfs_server *server = lsp->ls_state->owner->so_server; | |
790 | ||
791 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); | |
792 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); | |
793 | kfree(lsp); | |
794 | } | |
795 | ||
796 | /* | |
797 | * Return a compatible lock_state. If no initialized lock_state structure | |
798 | * exists, return an uninitialized one. | |
799 | * | |
800 | */ | |
801 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) | |
802 | { | |
803 | struct nfs4_lock_state *lsp, *new = NULL; | |
804 | ||
805 | for(;;) { | |
806 | spin_lock(&state->state_lock); | |
807 | lsp = __nfs4_find_lock_state(state, owner, pid, type); | |
808 | if (lsp != NULL) | |
809 | break; | |
810 | if (new != NULL) { | |
811 | list_add(&new->ls_locks, &state->lock_states); | |
812 | set_bit(LK_STATE_IN_USE, &state->flags); | |
813 | lsp = new; | |
814 | new = NULL; | |
815 | break; | |
816 | } | |
817 | spin_unlock(&state->state_lock); | |
818 | new = nfs4_alloc_lock_state(state, owner, pid, type); | |
819 | if (new == NULL) | |
820 | return NULL; | |
821 | } | |
822 | spin_unlock(&state->state_lock); | |
823 | if (new != NULL) | |
824 | nfs4_free_lock_state(new); | |
825 | return lsp; | |
826 | } | |
827 | ||
828 | /* | |
829 | * Release reference to lock_state, and free it if we see that | |
830 | * it is no longer in use | |
831 | */ | |
832 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) | |
833 | { | |
834 | struct nfs4_state *state; | |
835 | ||
836 | if (lsp == NULL) | |
837 | return; | |
838 | state = lsp->ls_state; | |
839 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
840 | return; | |
841 | list_del(&lsp->ls_locks); | |
842 | if (list_empty(&state->lock_states)) | |
843 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
844 | spin_unlock(&state->state_lock); | |
845 | if (lsp->ls_flags & NFS_LOCK_INITIALIZED) | |
846 | nfs4_release_lockowner(lsp); | |
847 | nfs4_free_lock_state(lsp); | |
848 | } | |
849 | ||
850 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) | |
851 | { | |
852 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; | |
853 | ||
854 | dst->fl_u.nfs4_fl.owner = lsp; | |
855 | atomic_inc(&lsp->ls_count); | |
856 | } | |
857 | ||
858 | static void nfs4_fl_release_lock(struct file_lock *fl) | |
859 | { | |
860 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); | |
861 | } | |
862 | ||
863 | static const struct file_lock_operations nfs4_fl_lock_ops = { | |
864 | .fl_copy_lock = nfs4_fl_copy_lock, | |
865 | .fl_release_private = nfs4_fl_release_lock, | |
866 | }; | |
867 | ||
868 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
869 | { | |
870 | struct nfs4_lock_state *lsp; | |
871 | ||
872 | if (fl->fl_ops != NULL) | |
873 | return 0; | |
874 | if (fl->fl_flags & FL_POSIX) | |
875 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
876 | else if (fl->fl_flags & FL_FLOCK) | |
877 | lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE); | |
878 | else | |
879 | return -EINVAL; | |
880 | if (lsp == NULL) | |
881 | return -ENOMEM; | |
882 | fl->fl_u.nfs4_fl.owner = lsp; | |
883 | fl->fl_ops = &nfs4_fl_lock_ops; | |
884 | return 0; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Byte-range lock aware utility to initialize the stateid of read/write | |
889 | * requests. | |
890 | */ | |
891 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid) | |
892 | { | |
893 | struct nfs4_lock_state *lsp; | |
894 | int seq; | |
895 | ||
896 | do { | |
897 | seq = read_seqbegin(&state->seqlock); | |
898 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
899 | } while (read_seqretry(&state->seqlock, seq)); | |
900 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) | |
901 | return; | |
902 | ||
903 | spin_lock(&state->state_lock); | |
904 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); | |
905 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
906 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
907 | spin_unlock(&state->state_lock); | |
908 | nfs4_put_lock_state(lsp); | |
909 | } | |
910 | ||
911 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) | |
912 | { | |
913 | struct nfs_seqid *new; | |
914 | ||
915 | new = kmalloc(sizeof(*new), gfp_mask); | |
916 | if (new != NULL) { | |
917 | new->sequence = counter; | |
918 | INIT_LIST_HEAD(&new->list); | |
919 | new->task = NULL; | |
920 | } | |
921 | return new; | |
922 | } | |
923 | ||
924 | void nfs_release_seqid(struct nfs_seqid *seqid) | |
925 | { | |
926 | struct nfs_seqid_counter *sequence; | |
927 | ||
928 | if (list_empty(&seqid->list)) | |
929 | return; | |
930 | sequence = seqid->sequence; | |
931 | spin_lock(&sequence->lock); | |
932 | list_del_init(&seqid->list); | |
933 | if (!list_empty(&sequence->list)) { | |
934 | struct nfs_seqid *next; | |
935 | ||
936 | next = list_first_entry(&sequence->list, | |
937 | struct nfs_seqid, list); | |
938 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
939 | } | |
940 | spin_unlock(&sequence->lock); | |
941 | } | |
942 | ||
943 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
944 | { | |
945 | nfs_release_seqid(seqid); | |
946 | kfree(seqid); | |
947 | } | |
948 | ||
949 | /* | |
950 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or | |
951 | * failed with a seqid incrementing error - | |
952 | * see comments nfs_fs.h:seqid_mutating_error() | |
953 | */ | |
954 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) | |
955 | { | |
956 | BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid); | |
957 | switch (status) { | |
958 | case 0: | |
959 | break; | |
960 | case -NFS4ERR_BAD_SEQID: | |
961 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) | |
962 | return; | |
963 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
964 | " sequence-id error on an" | |
965 | " unconfirmed sequence %p!\n", | |
966 | seqid->sequence); | |
967 | case -NFS4ERR_STALE_CLIENTID: | |
968 | case -NFS4ERR_STALE_STATEID: | |
969 | case -NFS4ERR_BAD_STATEID: | |
970 | case -NFS4ERR_BADXDR: | |
971 | case -NFS4ERR_RESOURCE: | |
972 | case -NFS4ERR_NOFILEHANDLE: | |
973 | /* Non-seqid mutating errors */ | |
974 | return; | |
975 | }; | |
976 | /* | |
977 | * Note: no locking needed as we are guaranteed to be first | |
978 | * on the sequence list | |
979 | */ | |
980 | seqid->sequence->counter++; | |
981 | } | |
982 | ||
983 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
984 | { | |
985 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
986 | struct nfs4_state_owner, so_seqid); | |
987 | struct nfs_server *server = sp->so_server; | |
988 | ||
989 | if (status == -NFS4ERR_BAD_SEQID) | |
990 | nfs4_drop_state_owner(sp); | |
991 | if (!nfs4_has_session(server->nfs_client)) | |
992 | nfs_increment_seqid(status, seqid); | |
993 | } | |
994 | ||
995 | /* | |
996 | * Increment the seqid if the LOCK/LOCKU succeeded, or | |
997 | * failed with a seqid incrementing error - | |
998 | * see comments nfs_fs.h:seqid_mutating_error() | |
999 | */ | |
1000 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1001 | { | |
1002 | nfs_increment_seqid(status, seqid); | |
1003 | } | |
1004 | ||
1005 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1006 | { | |
1007 | struct nfs_seqid_counter *sequence = seqid->sequence; | |
1008 | int status = 0; | |
1009 | ||
1010 | spin_lock(&sequence->lock); | |
1011 | seqid->task = task; | |
1012 | if (list_empty(&seqid->list)) | |
1013 | list_add_tail(&seqid->list, &sequence->list); | |
1014 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1015 | goto unlock; | |
1016 | rpc_sleep_on(&sequence->wait, task, NULL); | |
1017 | status = -EAGAIN; | |
1018 | unlock: | |
1019 | spin_unlock(&sequence->lock); | |
1020 | return status; | |
1021 | } | |
1022 | ||
1023 | static int nfs4_run_state_manager(void *); | |
1024 | ||
1025 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) | |
1026 | { | |
1027 | smp_mb__before_clear_bit(); | |
1028 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); | |
1029 | smp_mb__after_clear_bit(); | |
1030 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); | |
1031 | rpc_wake_up(&clp->cl_rpcwaitq); | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Schedule the nfs_client asynchronous state management routine | |
1036 | */ | |
1037 | void nfs4_schedule_state_manager(struct nfs_client *clp) | |
1038 | { | |
1039 | struct task_struct *task; | |
1040 | ||
1041 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1042 | return; | |
1043 | __module_get(THIS_MODULE); | |
1044 | atomic_inc(&clp->cl_count); | |
1045 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", | |
1046 | rpc_peeraddr2str(clp->cl_rpcclient, | |
1047 | RPC_DISPLAY_ADDR)); | |
1048 | if (!IS_ERR(task)) | |
1049 | return; | |
1050 | nfs4_clear_state_manager_bit(clp); | |
1051 | nfs_put_client(clp); | |
1052 | module_put(THIS_MODULE); | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Schedule a lease recovery attempt | |
1057 | */ | |
1058 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) | |
1059 | { | |
1060 | if (!clp) | |
1061 | return; | |
1062 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1063 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1064 | nfs4_schedule_state_manager(clp); | |
1065 | } | |
1066 | ||
1067 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) | |
1068 | { | |
1069 | nfs_handle_cb_pathdown(clp); | |
1070 | nfs4_schedule_state_manager(clp); | |
1071 | } | |
1072 | ||
1073 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) | |
1074 | { | |
1075 | ||
1076 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1077 | /* Don't recover state that expired before the reboot */ | |
1078 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1079 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1080 | return 0; | |
1081 | } | |
1082 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); | |
1083 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1084 | return 1; | |
1085 | } | |
1086 | ||
1087 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) | |
1088 | { | |
1089 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1090 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1091 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); | |
1092 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1096 | void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) | |
1097 | { | |
1098 | struct nfs_client *clp = server->nfs_client; | |
1099 | ||
1100 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1101 | nfs4_schedule_state_manager(clp); | |
1102 | } | |
1103 | ||
1104 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) | |
1105 | { | |
1106 | struct inode *inode = state->inode; | |
1107 | struct nfs_inode *nfsi = NFS_I(inode); | |
1108 | struct file_lock *fl; | |
1109 | int status = 0; | |
1110 | ||
1111 | if (inode->i_flock == NULL) | |
1112 | return 0; | |
1113 | ||
1114 | /* Guard against delegation returns and new lock/unlock calls */ | |
1115 | down_write(&nfsi->rwsem); | |
1116 | /* Protect inode->i_flock using the BKL */ | |
1117 | lock_flocks(); | |
1118 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { | |
1119 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) | |
1120 | continue; | |
1121 | if (nfs_file_open_context(fl->fl_file)->state != state) | |
1122 | continue; | |
1123 | unlock_flocks(); | |
1124 | status = ops->recover_lock(state, fl); | |
1125 | switch (status) { | |
1126 | case 0: | |
1127 | break; | |
1128 | case -ESTALE: | |
1129 | case -NFS4ERR_ADMIN_REVOKED: | |
1130 | case -NFS4ERR_STALE_STATEID: | |
1131 | case -NFS4ERR_BAD_STATEID: | |
1132 | case -NFS4ERR_EXPIRED: | |
1133 | case -NFS4ERR_NO_GRACE: | |
1134 | case -NFS4ERR_STALE_CLIENTID: | |
1135 | case -NFS4ERR_BADSESSION: | |
1136 | case -NFS4ERR_BADSLOT: | |
1137 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1138 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1139 | goto out; | |
1140 | default: | |
1141 | printk(KERN_ERR "NFS: %s: unhandled error %d. " | |
1142 | "Zeroing state\n", __func__, status); | |
1143 | case -ENOMEM: | |
1144 | case -NFS4ERR_DENIED: | |
1145 | case -NFS4ERR_RECLAIM_BAD: | |
1146 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1147 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ | |
1148 | status = 0; | |
1149 | } | |
1150 | lock_flocks(); | |
1151 | } | |
1152 | unlock_flocks(); | |
1153 | out: | |
1154 | up_write(&nfsi->rwsem); | |
1155 | return status; | |
1156 | } | |
1157 | ||
1158 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) | |
1159 | { | |
1160 | struct nfs4_state *state; | |
1161 | struct nfs4_lock_state *lock; | |
1162 | int status = 0; | |
1163 | ||
1164 | /* Note: we rely on the sp->so_states list being ordered | |
1165 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1166 | * states first. | |
1167 | * This is needed to ensure that the server won't give us any | |
1168 | * read delegations that we have to return if, say, we are | |
1169 | * recovering after a network partition or a reboot from a | |
1170 | * server that doesn't support a grace period. | |
1171 | */ | |
1172 | restart: | |
1173 | spin_lock(&sp->so_lock); | |
1174 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1175 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) | |
1176 | continue; | |
1177 | if (state->state == 0) | |
1178 | continue; | |
1179 | atomic_inc(&state->count); | |
1180 | spin_unlock(&sp->so_lock); | |
1181 | status = ops->recover_open(sp, state); | |
1182 | if (status >= 0) { | |
1183 | status = nfs4_reclaim_locks(state, ops); | |
1184 | if (status >= 0) { | |
1185 | spin_lock(&state->state_lock); | |
1186 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1187 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
1188 | printk("NFS: %s: Lock reclaim " | |
1189 | "failed!\n", __func__); | |
1190 | } | |
1191 | spin_unlock(&state->state_lock); | |
1192 | nfs4_put_open_state(state); | |
1193 | goto restart; | |
1194 | } | |
1195 | } | |
1196 | switch (status) { | |
1197 | default: | |
1198 | printk(KERN_ERR "NFS: %s: unhandled error %d. " | |
1199 | "Zeroing state\n", __func__, status); | |
1200 | case -ENOENT: | |
1201 | case -ENOMEM: | |
1202 | case -ESTALE: | |
1203 | /* | |
1204 | * Open state on this file cannot be recovered | |
1205 | * All we can do is revert to using the zero stateid. | |
1206 | */ | |
1207 | memset(state->stateid.data, 0, | |
1208 | sizeof(state->stateid.data)); | |
1209 | /* Mark the file as being 'closed' */ | |
1210 | state->state = 0; | |
1211 | break; | |
1212 | case -EKEYEXPIRED: | |
1213 | /* | |
1214 | * User RPCSEC_GSS context has expired. | |
1215 | * We cannot recover this stateid now, so | |
1216 | * skip it and allow recovery thread to | |
1217 | * proceed. | |
1218 | */ | |
1219 | break; | |
1220 | case -NFS4ERR_ADMIN_REVOKED: | |
1221 | case -NFS4ERR_STALE_STATEID: | |
1222 | case -NFS4ERR_BAD_STATEID: | |
1223 | case -NFS4ERR_RECLAIM_BAD: | |
1224 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1225 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1226 | break; | |
1227 | case -NFS4ERR_EXPIRED: | |
1228 | case -NFS4ERR_NO_GRACE: | |
1229 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1230 | case -NFS4ERR_STALE_CLIENTID: | |
1231 | case -NFS4ERR_BADSESSION: | |
1232 | case -NFS4ERR_BADSLOT: | |
1233 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1234 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1235 | goto out_err; | |
1236 | } | |
1237 | nfs4_put_open_state(state); | |
1238 | goto restart; | |
1239 | } | |
1240 | spin_unlock(&sp->so_lock); | |
1241 | return 0; | |
1242 | out_err: | |
1243 | nfs4_put_open_state(state); | |
1244 | return status; | |
1245 | } | |
1246 | ||
1247 | static void nfs4_clear_open_state(struct nfs4_state *state) | |
1248 | { | |
1249 | struct nfs4_lock_state *lock; | |
1250 | ||
1251 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1252 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1253 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1254 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
1255 | spin_lock(&state->state_lock); | |
1256 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1257 | lock->ls_seqid.flags = 0; | |
1258 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1259 | } | |
1260 | spin_unlock(&state->state_lock); | |
1261 | } | |
1262 | ||
1263 | static void nfs4_reset_seqids(struct nfs_server *server, | |
1264 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1265 | { | |
1266 | struct nfs_client *clp = server->nfs_client; | |
1267 | struct nfs4_state_owner *sp; | |
1268 | struct rb_node *pos; | |
1269 | struct nfs4_state *state; | |
1270 | ||
1271 | spin_lock(&clp->cl_lock); | |
1272 | for (pos = rb_first(&server->state_owners); | |
1273 | pos != NULL; | |
1274 | pos = rb_next(pos)) { | |
1275 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
1276 | sp->so_seqid.flags = 0; | |
1277 | spin_lock(&sp->so_lock); | |
1278 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1279 | if (mark_reclaim(clp, state)) | |
1280 | nfs4_clear_open_state(state); | |
1281 | } | |
1282 | spin_unlock(&sp->so_lock); | |
1283 | } | |
1284 | spin_unlock(&clp->cl_lock); | |
1285 | } | |
1286 | ||
1287 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1288 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1289 | { | |
1290 | struct nfs_server *server; | |
1291 | ||
1292 | rcu_read_lock(); | |
1293 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1294 | nfs4_reset_seqids(server, mark_reclaim); | |
1295 | rcu_read_unlock(); | |
1296 | } | |
1297 | ||
1298 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) | |
1299 | { | |
1300 | /* Mark all delegations for reclaim */ | |
1301 | nfs_delegation_mark_reclaim(clp); | |
1302 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1303 | } | |
1304 | ||
1305 | static void nfs4_reclaim_complete(struct nfs_client *clp, | |
1306 | const struct nfs4_state_recovery_ops *ops) | |
1307 | { | |
1308 | /* Notify the server we're done reclaiming our state */ | |
1309 | if (ops->reclaim_complete) | |
1310 | (void)ops->reclaim_complete(clp); | |
1311 | } | |
1312 | ||
1313 | static void nfs4_clear_reclaim_server(struct nfs_server *server) | |
1314 | { | |
1315 | struct nfs_client *clp = server->nfs_client; | |
1316 | struct nfs4_state_owner *sp; | |
1317 | struct rb_node *pos; | |
1318 | struct nfs4_state *state; | |
1319 | ||
1320 | spin_lock(&clp->cl_lock); | |
1321 | for (pos = rb_first(&server->state_owners); | |
1322 | pos != NULL; | |
1323 | pos = rb_next(pos)) { | |
1324 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
1325 | spin_lock(&sp->so_lock); | |
1326 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1327 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, | |
1328 | &state->flags)) | |
1329 | continue; | |
1330 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1331 | } | |
1332 | spin_unlock(&sp->so_lock); | |
1333 | } | |
1334 | spin_unlock(&clp->cl_lock); | |
1335 | } | |
1336 | ||
1337 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1338 | { | |
1339 | struct nfs_server *server; | |
1340 | ||
1341 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1342 | return 0; | |
1343 | ||
1344 | rcu_read_lock(); | |
1345 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1346 | nfs4_clear_reclaim_server(server); | |
1347 | rcu_read_unlock(); | |
1348 | ||
1349 | nfs_delegation_reap_unclaimed(clp); | |
1350 | return 1; | |
1351 | } | |
1352 | ||
1353 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1354 | { | |
1355 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1356 | return; | |
1357 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
1358 | } | |
1359 | ||
1360 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1361 | { | |
1362 | nfs_delegation_mark_reclaim(clp); | |
1363 | nfs_delegation_reap_unclaimed(clp); | |
1364 | } | |
1365 | ||
1366 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1367 | { | |
1368 | nfs_delegation_clear_all(clp); | |
1369 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1370 | } | |
1371 | ||
1372 | static void nfs4_warn_keyexpired(const char *s) | |
1373 | { | |
1374 | printk_ratelimited(KERN_WARNING "Error: state manager" | |
1375 | " encountered RPCSEC_GSS session" | |
1376 | " expired against NFSv4 server %s.\n", | |
1377 | s); | |
1378 | } | |
1379 | ||
1380 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) | |
1381 | { | |
1382 | switch (error) { | |
1383 | case 0: | |
1384 | break; | |
1385 | case -NFS4ERR_CB_PATH_DOWN: | |
1386 | nfs_handle_cb_pathdown(clp); | |
1387 | break; | |
1388 | case -NFS4ERR_NO_GRACE: | |
1389 | nfs4_state_end_reclaim_reboot(clp); | |
1390 | break; | |
1391 | case -NFS4ERR_STALE_CLIENTID: | |
1392 | case -NFS4ERR_LEASE_MOVED: | |
1393 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1394 | nfs4_state_clear_reclaim_reboot(clp); | |
1395 | nfs4_state_start_reclaim_reboot(clp); | |
1396 | break; | |
1397 | case -NFS4ERR_EXPIRED: | |
1398 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1399 | nfs4_state_start_reclaim_nograce(clp); | |
1400 | break; | |
1401 | case -NFS4ERR_BADSESSION: | |
1402 | case -NFS4ERR_BADSLOT: | |
1403 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1404 | case -NFS4ERR_DEADSESSION: | |
1405 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1406 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1407 | case -NFS4ERR_SEQ_MISORDERED: | |
1408 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1409 | /* Zero session reset errors */ | |
1410 | break; | |
1411 | case -EKEYEXPIRED: | |
1412 | /* Nothing we can do */ | |
1413 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1414 | break; | |
1415 | default: | |
1416 | return error; | |
1417 | } | |
1418 | return 0; | |
1419 | } | |
1420 | ||
1421 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) | |
1422 | { | |
1423 | struct nfs4_state_owner *sp; | |
1424 | struct nfs_server *server; | |
1425 | struct rb_node *pos; | |
1426 | int status = 0; | |
1427 | ||
1428 | restart: | |
1429 | rcu_read_lock(); | |
1430 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
1431 | nfs4_purge_state_owners(server); | |
1432 | spin_lock(&clp->cl_lock); | |
1433 | for (pos = rb_first(&server->state_owners); | |
1434 | pos != NULL; | |
1435 | pos = rb_next(pos)) { | |
1436 | sp = rb_entry(pos, | |
1437 | struct nfs4_state_owner, so_server_node); | |
1438 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1439 | &sp->so_flags)) | |
1440 | continue; | |
1441 | atomic_inc(&sp->so_count); | |
1442 | spin_unlock(&clp->cl_lock); | |
1443 | rcu_read_unlock(); | |
1444 | ||
1445 | status = nfs4_reclaim_open_state(sp, ops); | |
1446 | if (status < 0) { | |
1447 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1448 | nfs4_put_state_owner(sp); | |
1449 | return nfs4_recovery_handle_error(clp, status); | |
1450 | } | |
1451 | ||
1452 | nfs4_put_state_owner(sp); | |
1453 | goto restart; | |
1454 | } | |
1455 | spin_unlock(&clp->cl_lock); | |
1456 | } | |
1457 | rcu_read_unlock(); | |
1458 | return status; | |
1459 | } | |
1460 | ||
1461 | static int nfs4_check_lease(struct nfs_client *clp) | |
1462 | { | |
1463 | struct rpc_cred *cred; | |
1464 | const struct nfs4_state_maintenance_ops *ops = | |
1465 | clp->cl_mvops->state_renewal_ops; | |
1466 | int status; | |
1467 | ||
1468 | /* Is the client already known to have an expired lease? */ | |
1469 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1470 | return 0; | |
1471 | spin_lock(&clp->cl_lock); | |
1472 | cred = ops->get_state_renewal_cred_locked(clp); | |
1473 | spin_unlock(&clp->cl_lock); | |
1474 | if (cred == NULL) { | |
1475 | cred = nfs4_get_setclientid_cred(clp); | |
1476 | status = -ENOKEY; | |
1477 | if (cred == NULL) | |
1478 | goto out; | |
1479 | } | |
1480 | status = ops->renew_lease(clp, cred); | |
1481 | put_rpccred(cred); | |
1482 | out: | |
1483 | return nfs4_recovery_handle_error(clp, status); | |
1484 | } | |
1485 | ||
1486 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1487 | { | |
1488 | struct rpc_cred *cred; | |
1489 | const struct nfs4_state_recovery_ops *ops = | |
1490 | clp->cl_mvops->reboot_recovery_ops; | |
1491 | int status = -ENOENT; | |
1492 | ||
1493 | cred = ops->get_clid_cred(clp); | |
1494 | if (cred != NULL) { | |
1495 | status = ops->establish_clid(clp, cred); | |
1496 | put_rpccred(cred); | |
1497 | /* Handle case where the user hasn't set up machine creds */ | |
1498 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1499 | nfs4_clear_machine_cred(clp); | |
1500 | status = -EAGAIN; | |
1501 | } | |
1502 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) | |
1503 | status = -EPROTONOSUPPORT; | |
1504 | } | |
1505 | return status; | |
1506 | } | |
1507 | ||
1508 | #ifdef CONFIG_NFS_V4_1 | |
1509 | void nfs4_schedule_session_recovery(struct nfs4_session *session) | |
1510 | { | |
1511 | struct nfs_client *clp = session->clp; | |
1512 | ||
1513 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1514 | nfs4_schedule_lease_recovery(clp); | |
1515 | } | |
1516 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); | |
1517 | ||
1518 | void nfs41_handle_recall_slot(struct nfs_client *clp) | |
1519 | { | |
1520 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
1521 | nfs4_schedule_state_manager(clp); | |
1522 | } | |
1523 | ||
1524 | static void nfs4_reset_all_state(struct nfs_client *clp) | |
1525 | { | |
1526 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1527 | clp->cl_boot_time = CURRENT_TIME; | |
1528 | nfs4_state_start_reclaim_nograce(clp); | |
1529 | nfs4_schedule_state_manager(clp); | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1534 | { | |
1535 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1536 | nfs4_state_start_reclaim_reboot(clp); | |
1537 | nfs4_schedule_state_manager(clp); | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1542 | { | |
1543 | /* Temporary */ | |
1544 | nfs4_reset_all_state(clp); | |
1545 | } | |
1546 | ||
1547 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1548 | { | |
1549 | /* This will need to handle layouts too */ | |
1550 | nfs_expire_all_delegations(clp); | |
1551 | } | |
1552 | ||
1553 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) | |
1554 | { | |
1555 | nfs_expire_all_delegations(clp); | |
1556 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
1557 | nfs4_schedule_state_manager(clp); | |
1558 | } | |
1559 | ||
1560 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) | |
1561 | { | |
1562 | if (!flags) | |
1563 | return; | |
1564 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) | |
1565 | nfs41_handle_server_reboot(clp); | |
1566 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | | |
1567 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | | |
1568 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
1569 | SEQ4_STATUS_LEASE_MOVED)) | |
1570 | nfs41_handle_state_revoked(clp); | |
1571 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) | |
1572 | nfs41_handle_recallable_state_revoked(clp); | |
1573 | if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
1574 | SEQ4_STATUS_BACKCHANNEL_FAULT | | |
1575 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
1576 | nfs41_handle_cb_path_down(clp); | |
1577 | } | |
1578 | ||
1579 | static int nfs4_reset_session(struct nfs_client *clp) | |
1580 | { | |
1581 | int status; | |
1582 | ||
1583 | nfs4_begin_drain_session(clp); | |
1584 | status = nfs4_proc_destroy_session(clp->cl_session); | |
1585 | if (status && status != -NFS4ERR_BADSESSION && | |
1586 | status != -NFS4ERR_DEADSESSION) { | |
1587 | status = nfs4_recovery_handle_error(clp, status); | |
1588 | goto out; | |
1589 | } | |
1590 | ||
1591 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
1592 | status = nfs4_proc_create_session(clp); | |
1593 | if (status) { | |
1594 | status = nfs4_recovery_handle_error(clp, status); | |
1595 | goto out; | |
1596 | } | |
1597 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1598 | /* create_session negotiated new slot table */ | |
1599 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
1600 | ||
1601 | /* Let the state manager reestablish state */ | |
1602 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1603 | nfs41_setup_state_renewal(clp); | |
1604 | out: | |
1605 | return status; | |
1606 | } | |
1607 | ||
1608 | static int nfs4_recall_slot(struct nfs_client *clp) | |
1609 | { | |
1610 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1611 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1612 | struct nfs4_slot *new, *old; | |
1613 | int i; | |
1614 | ||
1615 | nfs4_begin_drain_session(clp); | |
1616 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
1617 | GFP_NOFS); | |
1618 | if (!new) | |
1619 | return -ENOMEM; | |
1620 | ||
1621 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1622 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1623 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1624 | old = fc_tbl->slots; | |
1625 | fc_tbl->slots = new; | |
1626 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1627 | fc_tbl->target_max_slots = 0; | |
1628 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1629 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1630 | ||
1631 | kfree(old); | |
1632 | nfs4_end_drain_session(clp); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | #else /* CONFIG_NFS_V4_1 */ | |
1637 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } | |
1638 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } | |
1639 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } | |
1640 | #endif /* CONFIG_NFS_V4_1 */ | |
1641 | ||
1642 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors | |
1643 | * on EXCHANGE_ID for v4.1 | |
1644 | */ | |
1645 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1646 | { | |
1647 | switch (status) { | |
1648 | case -NFS4ERR_CLID_INUSE: | |
1649 | case -NFS4ERR_STALE_CLIENTID: | |
1650 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1651 | break; | |
1652 | case -NFS4ERR_DELAY: | |
1653 | case -ETIMEDOUT: | |
1654 | case -EAGAIN: | |
1655 | ssleep(1); | |
1656 | break; | |
1657 | ||
1658 | case -EKEYEXPIRED: | |
1659 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1660 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery | |
1661 | * in nfs4_exchange_id */ | |
1662 | default: | |
1663 | return; | |
1664 | } | |
1665 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1666 | } | |
1667 | ||
1668 | static void nfs4_state_manager(struct nfs_client *clp) | |
1669 | { | |
1670 | int status = 0; | |
1671 | ||
1672 | /* Ensure exclusive access to NFSv4 state */ | |
1673 | do { | |
1674 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { | |
1675 | /* We're going to have to re-establish a clientid */ | |
1676 | status = nfs4_reclaim_lease(clp); | |
1677 | if (status) { | |
1678 | nfs4_set_lease_expired(clp, status); | |
1679 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, | |
1680 | &clp->cl_state)) | |
1681 | continue; | |
1682 | if (clp->cl_cons_state == | |
1683 | NFS_CS_SESSION_INITING) | |
1684 | nfs_mark_client_ready(clp, status); | |
1685 | goto out_error; | |
1686 | } | |
1687 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1688 | ||
1689 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, | |
1690 | &clp->cl_state)) | |
1691 | nfs4_state_start_reclaim_nograce(clp); | |
1692 | else | |
1693 | set_bit(NFS4CLNT_RECLAIM_REBOOT, | |
1694 | &clp->cl_state); | |
1695 | ||
1696 | pnfs_destroy_all_layouts(clp); | |
1697 | } | |
1698 | ||
1699 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1700 | status = nfs4_check_lease(clp); | |
1701 | if (status < 0) | |
1702 | goto out_error; | |
1703 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1704 | continue; | |
1705 | } | |
1706 | ||
1707 | /* Initialize or reset the session */ | |
1708 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) | |
1709 | && nfs4_has_session(clp)) { | |
1710 | status = nfs4_reset_session(clp); | |
1711 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1712 | continue; | |
1713 | if (status < 0) | |
1714 | goto out_error; | |
1715 | } | |
1716 | ||
1717 | /* First recover reboot state... */ | |
1718 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { | |
1719 | status = nfs4_do_reclaim(clp, | |
1720 | clp->cl_mvops->reboot_recovery_ops); | |
1721 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || | |
1722 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) | |
1723 | continue; | |
1724 | nfs4_state_end_reclaim_reboot(clp); | |
1725 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1726 | continue; | |
1727 | if (status < 0) | |
1728 | goto out_error; | |
1729 | } | |
1730 | ||
1731 | /* Now recover expired state... */ | |
1732 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
1733 | status = nfs4_do_reclaim(clp, | |
1734 | clp->cl_mvops->nograce_recovery_ops); | |
1735 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || | |
1736 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || | |
1737 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1738 | continue; | |
1739 | if (status < 0) | |
1740 | goto out_error; | |
1741 | } | |
1742 | ||
1743 | nfs4_end_drain_session(clp); | |
1744 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { | |
1745 | nfs_client_return_marked_delegations(clp); | |
1746 | continue; | |
1747 | } | |
1748 | /* Recall session slots */ | |
1749 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1750 | && nfs4_has_session(clp)) { | |
1751 | status = nfs4_recall_slot(clp); | |
1752 | if (status < 0) | |
1753 | goto out_error; | |
1754 | continue; | |
1755 | } | |
1756 | ||
1757 | ||
1758 | nfs4_clear_state_manager_bit(clp); | |
1759 | /* Did we race with an attempt to give us more work? */ | |
1760 | if (clp->cl_state == 0) | |
1761 | break; | |
1762 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1763 | break; | |
1764 | } while (atomic_read(&clp->cl_count) > 1); | |
1765 | return; | |
1766 | out_error: | |
1767 | printk(KERN_WARNING "NFS: state manager failed on NFSv4 server %s" | |
1768 | " with error %d\n", clp->cl_hostname, -status); | |
1769 | nfs4_end_drain_session(clp); | |
1770 | nfs4_clear_state_manager_bit(clp); | |
1771 | } | |
1772 | ||
1773 | static int nfs4_run_state_manager(void *ptr) | |
1774 | { | |
1775 | struct nfs_client *clp = ptr; | |
1776 | ||
1777 | allow_signal(SIGKILL); | |
1778 | nfs4_state_manager(clp); | |
1779 | nfs_put_client(clp); | |
1780 | module_put_and_exit(0); | |
1781 | return 0; | |
1782 | } | |
1783 | ||
1784 | /* | |
1785 | * Local variables: | |
1786 | * c-basic-offset: 8 | |
1787 | * End: | |
1788 | */ |