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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 | ||
53 | #include "nfs4_fs.h" | |
54 | #include "callback.h" | |
55 | #include "delegation.h" | |
56 | #include "internal.h" | |
57 | #include "pnfs.h" | |
58 | ||
59 | #define OPENOWNER_POOL_SIZE 8 | |
60 | ||
61 | const nfs4_stateid zero_stateid; | |
62 | ||
63 | static LIST_HEAD(nfs4_clientid_list); | |
64 | ||
65 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) | |
66 | { | |
67 | struct nfs4_setclientid_res clid = { | |
68 | .clientid = clp->cl_clientid, | |
69 | .confirm = clp->cl_confirm, | |
70 | }; | |
71 | unsigned short port; | |
72 | int status; | |
73 | ||
74 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) | |
75 | goto do_confirm; | |
76 | port = nfs_callback_tcpport; | |
77 | if (clp->cl_addr.ss_family == AF_INET6) | |
78 | port = nfs_callback_tcpport6; | |
79 | ||
80 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); | |
81 | if (status != 0) | |
82 | goto out; | |
83 | clp->cl_clientid = clid.clientid; | |
84 | clp->cl_confirm = clid.confirm; | |
85 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
86 | do_confirm: | |
87 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); | |
88 | if (status != 0) | |
89 | goto out; | |
90 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
91 | nfs4_schedule_state_renewal(clp); | |
92 | out: | |
93 | return status; | |
94 | } | |
95 | ||
96 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) | |
97 | { | |
98 | struct rpc_cred *cred = NULL; | |
99 | ||
100 | if (clp->cl_machine_cred != NULL) | |
101 | cred = get_rpccred(clp->cl_machine_cred); | |
102 | return cred; | |
103 | } | |
104 | ||
105 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
106 | { | |
107 | struct rpc_cred *cred; | |
108 | ||
109 | spin_lock(&clp->cl_lock); | |
110 | cred = clp->cl_machine_cred; | |
111 | clp->cl_machine_cred = NULL; | |
112 | spin_unlock(&clp->cl_lock); | |
113 | if (cred != NULL) | |
114 | put_rpccred(cred); | |
115 | } | |
116 | ||
117 | static struct rpc_cred * | |
118 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
119 | { | |
120 | struct rpc_cred *cred = NULL; | |
121 | struct nfs4_state_owner *sp; | |
122 | struct rb_node *pos; | |
123 | ||
124 | for (pos = rb_first(&server->state_owners); | |
125 | pos != NULL; | |
126 | pos = rb_next(pos)) { | |
127 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
128 | if (list_empty(&sp->so_states)) | |
129 | continue; | |
130 | cred = get_rpccred(sp->so_cred); | |
131 | break; | |
132 | } | |
133 | return cred; | |
134 | } | |
135 | ||
136 | /** | |
137 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
138 | * @clp: client state handle | |
139 | * | |
140 | * Returns an rpc_cred with reference count bumped, or NULL. | |
141 | * Caller must hold clp->cl_lock. | |
142 | */ | |
143 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
144 | { | |
145 | struct rpc_cred *cred = NULL; | |
146 | struct nfs_server *server; | |
147 | ||
148 | rcu_read_lock(); | |
149 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
150 | cred = nfs4_get_renew_cred_server_locked(server); | |
151 | if (cred != NULL) | |
152 | break; | |
153 | } | |
154 | rcu_read_unlock(); | |
155 | return cred; | |
156 | } | |
157 | ||
158 | #if defined(CONFIG_NFS_V4_1) | |
159 | ||
160 | static int nfs41_setup_state_renewal(struct nfs_client *clp) | |
161 | { | |
162 | int status; | |
163 | struct nfs_fsinfo fsinfo; | |
164 | ||
165 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { | |
166 | nfs4_schedule_state_renewal(clp); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | status = nfs4_proc_get_lease_time(clp, &fsinfo); | |
171 | if (status == 0) { | |
172 | /* Update lease time and schedule renewal */ | |
173 | spin_lock(&clp->cl_lock); | |
174 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
175 | clp->cl_last_renewal = jiffies; | |
176 | spin_unlock(&clp->cl_lock); | |
177 | ||
178 | nfs4_schedule_state_renewal(clp); | |
179 | } | |
180 | ||
181 | return status; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Back channel returns NFS4ERR_DELAY for new requests when | |
186 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
187 | * is ended. | |
188 | */ | |
189 | static void nfs4_end_drain_session(struct nfs_client *clp) | |
190 | { | |
191 | struct nfs4_session *ses = clp->cl_session; | |
192 | int max_slots; | |
193 | ||
194 | if (ses == NULL) | |
195 | return; | |
196 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { | |
197 | spin_lock(&ses->fc_slot_table.slot_tbl_lock); | |
198 | max_slots = ses->fc_slot_table.max_slots; | |
199 | while (max_slots--) { | |
200 | struct rpc_task *task; | |
201 | ||
202 | task = rpc_wake_up_next(&ses->fc_slot_table. | |
203 | slot_tbl_waitq); | |
204 | if (!task) | |
205 | break; | |
206 | rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); | |
207 | } | |
208 | spin_unlock(&ses->fc_slot_table.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 void nfs_alloc_unique_id_locked(struct rb_root *root, | |
320 | struct nfs_unique_id *new, | |
321 | __u64 minval, int maxbits) | |
322 | { | |
323 | struct rb_node **p, *parent; | |
324 | struct nfs_unique_id *pos; | |
325 | __u64 mask = ~0ULL; | |
326 | ||
327 | if (maxbits < 64) | |
328 | mask = (1ULL << maxbits) - 1ULL; | |
329 | ||
330 | /* Ensure distribution is more or less flat */ | |
331 | get_random_bytes(&new->id, sizeof(new->id)); | |
332 | new->id &= mask; | |
333 | if (new->id < minval) | |
334 | new->id += minval; | |
335 | retry: | |
336 | p = &root->rb_node; | |
337 | parent = NULL; | |
338 | ||
339 | while (*p != NULL) { | |
340 | parent = *p; | |
341 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
342 | ||
343 | if (new->id < pos->id) | |
344 | p = &(*p)->rb_left; | |
345 | else if (new->id > pos->id) | |
346 | p = &(*p)->rb_right; | |
347 | else | |
348 | goto id_exists; | |
349 | } | |
350 | rb_link_node(&new->rb_node, parent, p); | |
351 | rb_insert_color(&new->rb_node, root); | |
352 | return; | |
353 | id_exists: | |
354 | for (;;) { | |
355 | new->id++; | |
356 | if (new->id < minval || (new->id & mask) != new->id) { | |
357 | new->id = minval; | |
358 | break; | |
359 | } | |
360 | parent = rb_next(parent); | |
361 | if (parent == NULL) | |
362 | break; | |
363 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
364 | if (new->id < pos->id) | |
365 | break; | |
366 | } | |
367 | goto retry; | |
368 | } | |
369 | ||
370 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
371 | { | |
372 | rb_erase(&id->rb_node, root); | |
373 | } | |
374 | ||
375 | static struct nfs4_state_owner * | |
376 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) | |
377 | { | |
378 | struct rb_node **p = &server->state_owners.rb_node, | |
379 | *parent = NULL; | |
380 | struct nfs4_state_owner *sp, *res = NULL; | |
381 | ||
382 | while (*p != NULL) { | |
383 | parent = *p; | |
384 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); | |
385 | ||
386 | if (server < sp->so_server) { | |
387 | p = &parent->rb_left; | |
388 | continue; | |
389 | } | |
390 | if (server > sp->so_server) { | |
391 | p = &parent->rb_right; | |
392 | continue; | |
393 | } | |
394 | if (cred < sp->so_cred) | |
395 | p = &parent->rb_left; | |
396 | else if (cred > sp->so_cred) | |
397 | p = &parent->rb_right; | |
398 | else { | |
399 | atomic_inc(&sp->so_count); | |
400 | res = sp; | |
401 | break; | |
402 | } | |
403 | } | |
404 | return res; | |
405 | } | |
406 | ||
407 | static struct nfs4_state_owner * | |
408 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) | |
409 | { | |
410 | struct nfs_server *server = new->so_server; | |
411 | struct rb_node **p = &server->state_owners.rb_node, | |
412 | *parent = NULL; | |
413 | struct nfs4_state_owner *sp; | |
414 | ||
415 | while (*p != NULL) { | |
416 | parent = *p; | |
417 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); | |
418 | ||
419 | if (new->so_cred < sp->so_cred) | |
420 | p = &parent->rb_left; | |
421 | else if (new->so_cred > sp->so_cred) | |
422 | p = &parent->rb_right; | |
423 | else { | |
424 | atomic_inc(&sp->so_count); | |
425 | return sp; | |
426 | } | |
427 | } | |
428 | nfs_alloc_unique_id_locked(&server->openowner_id, | |
429 | &new->so_owner_id, 1, 64); | |
430 | rb_link_node(&new->so_server_node, parent, p); | |
431 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
432 | return new; | |
433 | } | |
434 | ||
435 | static void | |
436 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) | |
437 | { | |
438 | struct nfs_server *server = sp->so_server; | |
439 | ||
440 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
441 | rb_erase(&sp->so_server_node, &server->state_owners); | |
442 | nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id); | |
443 | } | |
444 | ||
445 | /* | |
446 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
447 | * create a new state_owner. | |
448 | * | |
449 | */ | |
450 | static struct nfs4_state_owner * | |
451 | nfs4_alloc_state_owner(void) | |
452 | { | |
453 | struct nfs4_state_owner *sp; | |
454 | ||
455 | sp = kzalloc(sizeof(*sp),GFP_NOFS); | |
456 | if (!sp) | |
457 | return NULL; | |
458 | spin_lock_init(&sp->so_lock); | |
459 | INIT_LIST_HEAD(&sp->so_states); | |
460 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); | |
461 | sp->so_seqid.sequence = &sp->so_sequence; | |
462 | spin_lock_init(&sp->so_sequence.lock); | |
463 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
464 | atomic_set(&sp->so_count, 1); | |
465 | return sp; | |
466 | } | |
467 | ||
468 | static void | |
469 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) | |
470 | { | |
471 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { | |
472 | struct nfs_server *server = sp->so_server; | |
473 | struct nfs_client *clp = server->nfs_client; | |
474 | ||
475 | spin_lock(&clp->cl_lock); | |
476 | rb_erase(&sp->so_server_node, &server->state_owners); | |
477 | RB_CLEAR_NODE(&sp->so_server_node); | |
478 | spin_unlock(&clp->cl_lock); | |
479 | } | |
480 | } | |
481 | ||
482 | /** | |
483 | * nfs4_get_state_owner - Look up a state owner given a credential | |
484 | * @server: nfs_server to search | |
485 | * @cred: RPC credential to match | |
486 | * | |
487 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
488 | */ | |
489 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
490 | struct rpc_cred *cred) | |
491 | { | |
492 | struct nfs_client *clp = server->nfs_client; | |
493 | struct nfs4_state_owner *sp, *new; | |
494 | ||
495 | spin_lock(&clp->cl_lock); | |
496 | sp = nfs4_find_state_owner_locked(server, cred); | |
497 | spin_unlock(&clp->cl_lock); | |
498 | if (sp != NULL) | |
499 | return sp; | |
500 | new = nfs4_alloc_state_owner(); | |
501 | if (new == NULL) | |
502 | return NULL; | |
503 | new->so_server = server; | |
504 | new->so_cred = cred; | |
505 | spin_lock(&clp->cl_lock); | |
506 | sp = nfs4_insert_state_owner_locked(new); | |
507 | spin_unlock(&clp->cl_lock); | |
508 | if (sp == new) | |
509 | get_rpccred(cred); | |
510 | else { | |
511 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
512 | kfree(new); | |
513 | } | |
514 | return sp; | |
515 | } | |
516 | ||
517 | /** | |
518 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
519 | * @sp: state owner data to release | |
520 | * | |
521 | */ | |
522 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) | |
523 | { | |
524 | struct nfs_client *clp = sp->so_server->nfs_client; | |
525 | struct rpc_cred *cred = sp->so_cred; | |
526 | ||
527 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
528 | return; | |
529 | nfs4_remove_state_owner_locked(sp); | |
530 | spin_unlock(&clp->cl_lock); | |
531 | rpc_destroy_wait_queue(&sp->so_sequence.wait); | |
532 | put_rpccred(cred); | |
533 | kfree(sp); | |
534 | } | |
535 | ||
536 | static struct nfs4_state * | |
537 | nfs4_alloc_open_state(void) | |
538 | { | |
539 | struct nfs4_state *state; | |
540 | ||
541 | state = kzalloc(sizeof(*state), GFP_NOFS); | |
542 | if (!state) | |
543 | return NULL; | |
544 | atomic_set(&state->count, 1); | |
545 | INIT_LIST_HEAD(&state->lock_states); | |
546 | spin_lock_init(&state->state_lock); | |
547 | seqlock_init(&state->seqlock); | |
548 | return state; | |
549 | } | |
550 | ||
551 | void | |
552 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) | |
553 | { | |
554 | if (state->state == fmode) | |
555 | return; | |
556 | /* NB! List reordering - see the reclaim code for why. */ | |
557 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { | |
558 | if (fmode & FMODE_WRITE) | |
559 | list_move(&state->open_states, &state->owner->so_states); | |
560 | else | |
561 | list_move_tail(&state->open_states, &state->owner->so_states); | |
562 | } | |
563 | state->state = fmode; | |
564 | } | |
565 | ||
566 | static struct nfs4_state * | |
567 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
568 | { | |
569 | struct nfs_inode *nfsi = NFS_I(inode); | |
570 | struct nfs4_state *state; | |
571 | ||
572 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
573 | if (state->owner != owner) | |
574 | continue; | |
575 | if (atomic_inc_not_zero(&state->count)) | |
576 | return state; | |
577 | } | |
578 | return NULL; | |
579 | } | |
580 | ||
581 | static void | |
582 | nfs4_free_open_state(struct nfs4_state *state) | |
583 | { | |
584 | kfree(state); | |
585 | } | |
586 | ||
587 | struct nfs4_state * | |
588 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
589 | { | |
590 | struct nfs4_state *state, *new; | |
591 | struct nfs_inode *nfsi = NFS_I(inode); | |
592 | ||
593 | spin_lock(&inode->i_lock); | |
594 | state = __nfs4_find_state_byowner(inode, owner); | |
595 | spin_unlock(&inode->i_lock); | |
596 | if (state) | |
597 | goto out; | |
598 | new = nfs4_alloc_open_state(); | |
599 | spin_lock(&owner->so_lock); | |
600 | spin_lock(&inode->i_lock); | |
601 | state = __nfs4_find_state_byowner(inode, owner); | |
602 | if (state == NULL && new != NULL) { | |
603 | state = new; | |
604 | state->owner = owner; | |
605 | atomic_inc(&owner->so_count); | |
606 | list_add(&state->inode_states, &nfsi->open_states); | |
607 | ihold(inode); | |
608 | state->inode = inode; | |
609 | spin_unlock(&inode->i_lock); | |
610 | /* Note: The reclaim code dictates that we add stateless | |
611 | * and read-only stateids to the end of the list */ | |
612 | list_add_tail(&state->open_states, &owner->so_states); | |
613 | spin_unlock(&owner->so_lock); | |
614 | } else { | |
615 | spin_unlock(&inode->i_lock); | |
616 | spin_unlock(&owner->so_lock); | |
617 | if (new) | |
618 | nfs4_free_open_state(new); | |
619 | } | |
620 | out: | |
621 | return state; | |
622 | } | |
623 | ||
624 | void nfs4_put_open_state(struct nfs4_state *state) | |
625 | { | |
626 | struct inode *inode = state->inode; | |
627 | struct nfs4_state_owner *owner = state->owner; | |
628 | ||
629 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) | |
630 | return; | |
631 | spin_lock(&inode->i_lock); | |
632 | list_del(&state->inode_states); | |
633 | list_del(&state->open_states); | |
634 | spin_unlock(&inode->i_lock); | |
635 | spin_unlock(&owner->so_lock); | |
636 | iput(inode); | |
637 | nfs4_free_open_state(state); | |
638 | nfs4_put_state_owner(owner); | |
639 | } | |
640 | ||
641 | /* | |
642 | * Close the current file. | |
643 | */ | |
644 | static void __nfs4_close(struct path *path, struct nfs4_state *state, | |
645 | fmode_t fmode, gfp_t gfp_mask, int wait) | |
646 | { | |
647 | struct nfs4_state_owner *owner = state->owner; | |
648 | int call_close = 0; | |
649 | fmode_t newstate; | |
650 | ||
651 | atomic_inc(&owner->so_count); | |
652 | /* Protect against nfs4_find_state() */ | |
653 | spin_lock(&owner->so_lock); | |
654 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { | |
655 | case FMODE_READ: | |
656 | state->n_rdonly--; | |
657 | break; | |
658 | case FMODE_WRITE: | |
659 | state->n_wronly--; | |
660 | break; | |
661 | case FMODE_READ|FMODE_WRITE: | |
662 | state->n_rdwr--; | |
663 | } | |
664 | newstate = FMODE_READ|FMODE_WRITE; | |
665 | if (state->n_rdwr == 0) { | |
666 | if (state->n_rdonly == 0) { | |
667 | newstate &= ~FMODE_READ; | |
668 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); | |
669 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
670 | } | |
671 | if (state->n_wronly == 0) { | |
672 | newstate &= ~FMODE_WRITE; | |
673 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); | |
674 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
675 | } | |
676 | if (newstate == 0) | |
677 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
678 | } | |
679 | nfs4_state_set_mode_locked(state, newstate); | |
680 | spin_unlock(&owner->so_lock); | |
681 | ||
682 | if (!call_close) { | |
683 | nfs4_put_open_state(state); | |
684 | nfs4_put_state_owner(owner); | |
685 | } else { | |
686 | bool roc = pnfs_roc(state->inode); | |
687 | ||
688 | nfs4_do_close(path, state, gfp_mask, wait, roc); | |
689 | } | |
690 | } | |
691 | ||
692 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) | |
693 | { | |
694 | __nfs4_close(path, state, fmode, GFP_NOFS, 0); | |
695 | } | |
696 | ||
697 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) | |
698 | { | |
699 | __nfs4_close(path, state, fmode, GFP_KERNEL, 1); | |
700 | } | |
701 | ||
702 | /* | |
703 | * Search the state->lock_states for an existing lock_owner | |
704 | * that is compatible with current->files | |
705 | */ | |
706 | static struct nfs4_lock_state * | |
707 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) | |
708 | { | |
709 | struct nfs4_lock_state *pos; | |
710 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
711 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) | |
712 | continue; | |
713 | switch (pos->ls_owner.lo_type) { | |
714 | case NFS4_POSIX_LOCK_TYPE: | |
715 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
716 | continue; | |
717 | break; | |
718 | case NFS4_FLOCK_LOCK_TYPE: | |
719 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
720 | continue; | |
721 | } | |
722 | atomic_inc(&pos->ls_count); | |
723 | return pos; | |
724 | } | |
725 | return NULL; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Return a compatible lock_state. If no initialized lock_state structure | |
730 | * exists, return an uninitialized one. | |
731 | * | |
732 | */ | |
733 | 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) | |
734 | { | |
735 | struct nfs4_lock_state *lsp; | |
736 | struct nfs_server *server = state->owner->so_server; | |
737 | struct nfs_client *clp = server->nfs_client; | |
738 | ||
739 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); | |
740 | if (lsp == NULL) | |
741 | return NULL; | |
742 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); | |
743 | spin_lock_init(&lsp->ls_sequence.lock); | |
744 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
745 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
746 | atomic_set(&lsp->ls_count, 1); | |
747 | lsp->ls_state = state; | |
748 | lsp->ls_owner.lo_type = type; | |
749 | switch (lsp->ls_owner.lo_type) { | |
750 | case NFS4_FLOCK_LOCK_TYPE: | |
751 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
752 | break; | |
753 | case NFS4_POSIX_LOCK_TYPE: | |
754 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
755 | break; | |
756 | default: | |
757 | kfree(lsp); | |
758 | return NULL; | |
759 | } | |
760 | spin_lock(&clp->cl_lock); | |
761 | nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64); | |
762 | spin_unlock(&clp->cl_lock); | |
763 | INIT_LIST_HEAD(&lsp->ls_locks); | |
764 | return lsp; | |
765 | } | |
766 | ||
767 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) | |
768 | { | |
769 | struct nfs_server *server = lsp->ls_state->owner->so_server; | |
770 | struct nfs_client *clp = server->nfs_client; | |
771 | ||
772 | spin_lock(&clp->cl_lock); | |
773 | nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id); | |
774 | spin_unlock(&clp->cl_lock); | |
775 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); | |
776 | kfree(lsp); | |
777 | } | |
778 | ||
779 | /* | |
780 | * Return a compatible lock_state. If no initialized lock_state structure | |
781 | * exists, return an uninitialized one. | |
782 | * | |
783 | */ | |
784 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) | |
785 | { | |
786 | struct nfs4_lock_state *lsp, *new = NULL; | |
787 | ||
788 | for(;;) { | |
789 | spin_lock(&state->state_lock); | |
790 | lsp = __nfs4_find_lock_state(state, owner, pid, type); | |
791 | if (lsp != NULL) | |
792 | break; | |
793 | if (new != NULL) { | |
794 | list_add(&new->ls_locks, &state->lock_states); | |
795 | set_bit(LK_STATE_IN_USE, &state->flags); | |
796 | lsp = new; | |
797 | new = NULL; | |
798 | break; | |
799 | } | |
800 | spin_unlock(&state->state_lock); | |
801 | new = nfs4_alloc_lock_state(state, owner, pid, type); | |
802 | if (new == NULL) | |
803 | return NULL; | |
804 | } | |
805 | spin_unlock(&state->state_lock); | |
806 | if (new != NULL) | |
807 | nfs4_free_lock_state(new); | |
808 | return lsp; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Release reference to lock_state, and free it if we see that | |
813 | * it is no longer in use | |
814 | */ | |
815 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) | |
816 | { | |
817 | struct nfs4_state *state; | |
818 | ||
819 | if (lsp == NULL) | |
820 | return; | |
821 | state = lsp->ls_state; | |
822 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
823 | return; | |
824 | list_del(&lsp->ls_locks); | |
825 | if (list_empty(&state->lock_states)) | |
826 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
827 | spin_unlock(&state->state_lock); | |
828 | if (lsp->ls_flags & NFS_LOCK_INITIALIZED) | |
829 | nfs4_release_lockowner(lsp); | |
830 | nfs4_free_lock_state(lsp); | |
831 | } | |
832 | ||
833 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) | |
834 | { | |
835 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; | |
836 | ||
837 | dst->fl_u.nfs4_fl.owner = lsp; | |
838 | atomic_inc(&lsp->ls_count); | |
839 | } | |
840 | ||
841 | static void nfs4_fl_release_lock(struct file_lock *fl) | |
842 | { | |
843 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); | |
844 | } | |
845 | ||
846 | static const struct file_lock_operations nfs4_fl_lock_ops = { | |
847 | .fl_copy_lock = nfs4_fl_copy_lock, | |
848 | .fl_release_private = nfs4_fl_release_lock, | |
849 | }; | |
850 | ||
851 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
852 | { | |
853 | struct nfs4_lock_state *lsp; | |
854 | ||
855 | if (fl->fl_ops != NULL) | |
856 | return 0; | |
857 | if (fl->fl_flags & FL_POSIX) | |
858 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
859 | else if (fl->fl_flags & FL_FLOCK) | |
860 | lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE); | |
861 | else | |
862 | return -EINVAL; | |
863 | if (lsp == NULL) | |
864 | return -ENOMEM; | |
865 | fl->fl_u.nfs4_fl.owner = lsp; | |
866 | fl->fl_ops = &nfs4_fl_lock_ops; | |
867 | return 0; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Byte-range lock aware utility to initialize the stateid of read/write | |
872 | * requests. | |
873 | */ | |
874 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid) | |
875 | { | |
876 | struct nfs4_lock_state *lsp; | |
877 | int seq; | |
878 | ||
879 | do { | |
880 | seq = read_seqbegin(&state->seqlock); | |
881 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
882 | } while (read_seqretry(&state->seqlock, seq)); | |
883 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) | |
884 | return; | |
885 | ||
886 | spin_lock(&state->state_lock); | |
887 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); | |
888 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) | |
889 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
890 | spin_unlock(&state->state_lock); | |
891 | nfs4_put_lock_state(lsp); | |
892 | } | |
893 | ||
894 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) | |
895 | { | |
896 | struct nfs_seqid *new; | |
897 | ||
898 | new = kmalloc(sizeof(*new), gfp_mask); | |
899 | if (new != NULL) { | |
900 | new->sequence = counter; | |
901 | INIT_LIST_HEAD(&new->list); | |
902 | } | |
903 | return new; | |
904 | } | |
905 | ||
906 | void nfs_release_seqid(struct nfs_seqid *seqid) | |
907 | { | |
908 | if (!list_empty(&seqid->list)) { | |
909 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
910 | ||
911 | spin_lock(&sequence->lock); | |
912 | list_del_init(&seqid->list); | |
913 | spin_unlock(&sequence->lock); | |
914 | rpc_wake_up(&sequence->wait); | |
915 | } | |
916 | } | |
917 | ||
918 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
919 | { | |
920 | nfs_release_seqid(seqid); | |
921 | kfree(seqid); | |
922 | } | |
923 | ||
924 | /* | |
925 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or | |
926 | * failed with a seqid incrementing error - | |
927 | * see comments nfs_fs.h:seqid_mutating_error() | |
928 | */ | |
929 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) | |
930 | { | |
931 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); | |
932 | switch (status) { | |
933 | case 0: | |
934 | break; | |
935 | case -NFS4ERR_BAD_SEQID: | |
936 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) | |
937 | return; | |
938 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
939 | " sequence-id error on an" | |
940 | " unconfirmed sequence %p!\n", | |
941 | seqid->sequence); | |
942 | case -NFS4ERR_STALE_CLIENTID: | |
943 | case -NFS4ERR_STALE_STATEID: | |
944 | case -NFS4ERR_BAD_STATEID: | |
945 | case -NFS4ERR_BADXDR: | |
946 | case -NFS4ERR_RESOURCE: | |
947 | case -NFS4ERR_NOFILEHANDLE: | |
948 | /* Non-seqid mutating errors */ | |
949 | return; | |
950 | }; | |
951 | /* | |
952 | * Note: no locking needed as we are guaranteed to be first | |
953 | * on the sequence list | |
954 | */ | |
955 | seqid->sequence->counter++; | |
956 | } | |
957 | ||
958 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
959 | { | |
960 | struct nfs4_state_owner *sp = container_of(seqid->sequence, | |
961 | struct nfs4_state_owner, so_seqid); | |
962 | struct nfs_server *server = sp->so_server; | |
963 | ||
964 | if (status == -NFS4ERR_BAD_SEQID) | |
965 | nfs4_drop_state_owner(sp); | |
966 | if (!nfs4_has_session(server->nfs_client)) | |
967 | nfs_increment_seqid(status, seqid); | |
968 | } | |
969 | ||
970 | /* | |
971 | * Increment the seqid if the LOCK/LOCKU succeeded, or | |
972 | * failed with a seqid incrementing error - | |
973 | * see comments nfs_fs.h:seqid_mutating_error() | |
974 | */ | |
975 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
976 | { | |
977 | nfs_increment_seqid(status, seqid); | |
978 | } | |
979 | ||
980 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
981 | { | |
982 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
983 | int status = 0; | |
984 | ||
985 | spin_lock(&sequence->lock); | |
986 | if (list_empty(&seqid->list)) | |
987 | list_add_tail(&seqid->list, &sequence->list); | |
988 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
989 | goto unlock; | |
990 | rpc_sleep_on(&sequence->wait, task, NULL); | |
991 | status = -EAGAIN; | |
992 | unlock: | |
993 | spin_unlock(&sequence->lock); | |
994 | return status; | |
995 | } | |
996 | ||
997 | static int nfs4_run_state_manager(void *); | |
998 | ||
999 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) | |
1000 | { | |
1001 | smp_mb__before_clear_bit(); | |
1002 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); | |
1003 | smp_mb__after_clear_bit(); | |
1004 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); | |
1005 | rpc_wake_up(&clp->cl_rpcwaitq); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Schedule the nfs_client asynchronous state management routine | |
1010 | */ | |
1011 | void nfs4_schedule_state_manager(struct nfs_client *clp) | |
1012 | { | |
1013 | struct task_struct *task; | |
1014 | ||
1015 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1016 | return; | |
1017 | __module_get(THIS_MODULE); | |
1018 | atomic_inc(&clp->cl_count); | |
1019 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", | |
1020 | rpc_peeraddr2str(clp->cl_rpcclient, | |
1021 | RPC_DISPLAY_ADDR)); | |
1022 | if (!IS_ERR(task)) | |
1023 | return; | |
1024 | nfs4_clear_state_manager_bit(clp); | |
1025 | nfs_put_client(clp); | |
1026 | module_put(THIS_MODULE); | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Schedule a lease recovery attempt | |
1031 | */ | |
1032 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) | |
1033 | { | |
1034 | if (!clp) | |
1035 | return; | |
1036 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1037 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1038 | nfs4_schedule_state_manager(clp); | |
1039 | } | |
1040 | ||
1041 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) | |
1042 | { | |
1043 | ||
1044 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1045 | /* Don't recover state that expired before the reboot */ | |
1046 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1047 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1048 | return 0; | |
1049 | } | |
1050 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); | |
1051 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1052 | return 1; | |
1053 | } | |
1054 | ||
1055 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) | |
1056 | { | |
1057 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1058 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1059 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); | |
1060 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); | |
1061 | return 1; | |
1062 | } | |
1063 | ||
1064 | void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) | |
1065 | { | |
1066 | struct nfs_client *clp = server->nfs_client; | |
1067 | ||
1068 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1069 | nfs4_schedule_state_manager(clp); | |
1070 | } | |
1071 | ||
1072 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) | |
1073 | { | |
1074 | struct inode *inode = state->inode; | |
1075 | struct nfs_inode *nfsi = NFS_I(inode); | |
1076 | struct file_lock *fl; | |
1077 | int status = 0; | |
1078 | ||
1079 | if (inode->i_flock == NULL) | |
1080 | return 0; | |
1081 | ||
1082 | /* Guard against delegation returns and new lock/unlock calls */ | |
1083 | down_write(&nfsi->rwsem); | |
1084 | /* Protect inode->i_flock using the BKL */ | |
1085 | lock_flocks(); | |
1086 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { | |
1087 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) | |
1088 | continue; | |
1089 | if (nfs_file_open_context(fl->fl_file)->state != state) | |
1090 | continue; | |
1091 | unlock_flocks(); | |
1092 | status = ops->recover_lock(state, fl); | |
1093 | switch (status) { | |
1094 | case 0: | |
1095 | break; | |
1096 | case -ESTALE: | |
1097 | case -NFS4ERR_ADMIN_REVOKED: | |
1098 | case -NFS4ERR_STALE_STATEID: | |
1099 | case -NFS4ERR_BAD_STATEID: | |
1100 | case -NFS4ERR_EXPIRED: | |
1101 | case -NFS4ERR_NO_GRACE: | |
1102 | case -NFS4ERR_STALE_CLIENTID: | |
1103 | case -NFS4ERR_BADSESSION: | |
1104 | case -NFS4ERR_BADSLOT: | |
1105 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1106 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1107 | goto out; | |
1108 | default: | |
1109 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
1110 | __func__, status); | |
1111 | case -ENOMEM: | |
1112 | case -NFS4ERR_DENIED: | |
1113 | case -NFS4ERR_RECLAIM_BAD: | |
1114 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1115 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ | |
1116 | status = 0; | |
1117 | } | |
1118 | lock_flocks(); | |
1119 | } | |
1120 | unlock_flocks(); | |
1121 | out: | |
1122 | up_write(&nfsi->rwsem); | |
1123 | return status; | |
1124 | } | |
1125 | ||
1126 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) | |
1127 | { | |
1128 | struct nfs4_state *state; | |
1129 | struct nfs4_lock_state *lock; | |
1130 | int status = 0; | |
1131 | ||
1132 | /* Note: we rely on the sp->so_states list being ordered | |
1133 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1134 | * states first. | |
1135 | * This is needed to ensure that the server won't give us any | |
1136 | * read delegations that we have to return if, say, we are | |
1137 | * recovering after a network partition or a reboot from a | |
1138 | * server that doesn't support a grace period. | |
1139 | */ | |
1140 | restart: | |
1141 | spin_lock(&sp->so_lock); | |
1142 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1143 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) | |
1144 | continue; | |
1145 | if (state->state == 0) | |
1146 | continue; | |
1147 | atomic_inc(&state->count); | |
1148 | spin_unlock(&sp->so_lock); | |
1149 | status = ops->recover_open(sp, state); | |
1150 | if (status >= 0) { | |
1151 | status = nfs4_reclaim_locks(state, ops); | |
1152 | if (status >= 0) { | |
1153 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1154 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
1155 | printk("%s: Lock reclaim failed!\n", | |
1156 | __func__); | |
1157 | } | |
1158 | nfs4_put_open_state(state); | |
1159 | goto restart; | |
1160 | } | |
1161 | } | |
1162 | switch (status) { | |
1163 | default: | |
1164 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
1165 | __func__, status); | |
1166 | case -ENOENT: | |
1167 | case -ENOMEM: | |
1168 | case -ESTALE: | |
1169 | /* | |
1170 | * Open state on this file cannot be recovered | |
1171 | * All we can do is revert to using the zero stateid. | |
1172 | */ | |
1173 | memset(state->stateid.data, 0, | |
1174 | sizeof(state->stateid.data)); | |
1175 | /* Mark the file as being 'closed' */ | |
1176 | state->state = 0; | |
1177 | break; | |
1178 | case -EKEYEXPIRED: | |
1179 | /* | |
1180 | * User RPCSEC_GSS context has expired. | |
1181 | * We cannot recover this stateid now, so | |
1182 | * skip it and allow recovery thread to | |
1183 | * proceed. | |
1184 | */ | |
1185 | break; | |
1186 | case -NFS4ERR_ADMIN_REVOKED: | |
1187 | case -NFS4ERR_STALE_STATEID: | |
1188 | case -NFS4ERR_BAD_STATEID: | |
1189 | case -NFS4ERR_RECLAIM_BAD: | |
1190 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1191 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1192 | break; | |
1193 | case -NFS4ERR_EXPIRED: | |
1194 | case -NFS4ERR_NO_GRACE: | |
1195 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1196 | case -NFS4ERR_STALE_CLIENTID: | |
1197 | case -NFS4ERR_BADSESSION: | |
1198 | case -NFS4ERR_BADSLOT: | |
1199 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1200 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1201 | goto out_err; | |
1202 | } | |
1203 | nfs4_put_open_state(state); | |
1204 | goto restart; | |
1205 | } | |
1206 | spin_unlock(&sp->so_lock); | |
1207 | return 0; | |
1208 | out_err: | |
1209 | nfs4_put_open_state(state); | |
1210 | return status; | |
1211 | } | |
1212 | ||
1213 | static void nfs4_clear_open_state(struct nfs4_state *state) | |
1214 | { | |
1215 | struct nfs4_lock_state *lock; | |
1216 | ||
1217 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1218 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1219 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1220 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
1221 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1222 | lock->ls_seqid.flags = 0; | |
1223 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | static void nfs4_reset_seqids(struct nfs_server *server, | |
1228 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1229 | { | |
1230 | struct nfs_client *clp = server->nfs_client; | |
1231 | struct nfs4_state_owner *sp; | |
1232 | struct rb_node *pos; | |
1233 | struct nfs4_state *state; | |
1234 | ||
1235 | spin_lock(&clp->cl_lock); | |
1236 | for (pos = rb_first(&server->state_owners); | |
1237 | pos != NULL; | |
1238 | pos = rb_next(pos)) { | |
1239 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
1240 | sp->so_seqid.flags = 0; | |
1241 | spin_lock(&sp->so_lock); | |
1242 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1243 | if (mark_reclaim(clp, state)) | |
1244 | nfs4_clear_open_state(state); | |
1245 | } | |
1246 | spin_unlock(&sp->so_lock); | |
1247 | } | |
1248 | spin_unlock(&clp->cl_lock); | |
1249 | } | |
1250 | ||
1251 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1252 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1253 | { | |
1254 | struct nfs_server *server; | |
1255 | ||
1256 | rcu_read_lock(); | |
1257 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1258 | nfs4_reset_seqids(server, mark_reclaim); | |
1259 | rcu_read_unlock(); | |
1260 | } | |
1261 | ||
1262 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) | |
1263 | { | |
1264 | /* Mark all delegations for reclaim */ | |
1265 | nfs_delegation_mark_reclaim(clp); | |
1266 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1267 | } | |
1268 | ||
1269 | static void nfs4_reclaim_complete(struct nfs_client *clp, | |
1270 | const struct nfs4_state_recovery_ops *ops) | |
1271 | { | |
1272 | /* Notify the server we're done reclaiming our state */ | |
1273 | if (ops->reclaim_complete) | |
1274 | (void)ops->reclaim_complete(clp); | |
1275 | } | |
1276 | ||
1277 | static void nfs4_clear_reclaim_server(struct nfs_server *server) | |
1278 | { | |
1279 | struct nfs_client *clp = server->nfs_client; | |
1280 | struct nfs4_state_owner *sp; | |
1281 | struct rb_node *pos; | |
1282 | struct nfs4_state *state; | |
1283 | ||
1284 | spin_lock(&clp->cl_lock); | |
1285 | for (pos = rb_first(&server->state_owners); | |
1286 | pos != NULL; | |
1287 | pos = rb_next(pos)) { | |
1288 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
1289 | spin_lock(&sp->so_lock); | |
1290 | list_for_each_entry(state, &sp->so_states, open_states) { | |
1291 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, | |
1292 | &state->flags)) | |
1293 | continue; | |
1294 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1295 | } | |
1296 | spin_unlock(&sp->so_lock); | |
1297 | } | |
1298 | spin_unlock(&clp->cl_lock); | |
1299 | } | |
1300 | ||
1301 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1302 | { | |
1303 | struct nfs_server *server; | |
1304 | ||
1305 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1306 | return 0; | |
1307 | ||
1308 | rcu_read_lock(); | |
1309 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1310 | nfs4_clear_reclaim_server(server); | |
1311 | rcu_read_unlock(); | |
1312 | ||
1313 | nfs_delegation_reap_unclaimed(clp); | |
1314 | return 1; | |
1315 | } | |
1316 | ||
1317 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1318 | { | |
1319 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1320 | return; | |
1321 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
1322 | } | |
1323 | ||
1324 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1325 | { | |
1326 | nfs_delegation_mark_reclaim(clp); | |
1327 | nfs_delegation_reap_unclaimed(clp); | |
1328 | } | |
1329 | ||
1330 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1331 | { | |
1332 | nfs_delegation_clear_all(clp); | |
1333 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1334 | } | |
1335 | ||
1336 | static void nfs4_warn_keyexpired(const char *s) | |
1337 | { | |
1338 | printk_ratelimited(KERN_WARNING "Error: state manager" | |
1339 | " encountered RPCSEC_GSS session" | |
1340 | " expired against NFSv4 server %s.\n", | |
1341 | s); | |
1342 | } | |
1343 | ||
1344 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) | |
1345 | { | |
1346 | switch (error) { | |
1347 | case -NFS4ERR_CB_PATH_DOWN: | |
1348 | nfs_handle_cb_pathdown(clp); | |
1349 | return 0; | |
1350 | case -NFS4ERR_NO_GRACE: | |
1351 | nfs4_state_end_reclaim_reboot(clp); | |
1352 | return 0; | |
1353 | case -NFS4ERR_STALE_CLIENTID: | |
1354 | case -NFS4ERR_LEASE_MOVED: | |
1355 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1356 | nfs4_state_clear_reclaim_reboot(clp); | |
1357 | nfs4_state_start_reclaim_reboot(clp); | |
1358 | break; | |
1359 | case -NFS4ERR_EXPIRED: | |
1360 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1361 | nfs4_state_start_reclaim_nograce(clp); | |
1362 | break; | |
1363 | case -NFS4ERR_BADSESSION: | |
1364 | case -NFS4ERR_BADSLOT: | |
1365 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1366 | case -NFS4ERR_DEADSESSION: | |
1367 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1368 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1369 | case -NFS4ERR_SEQ_MISORDERED: | |
1370 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1371 | /* Zero session reset errors */ | |
1372 | return 0; | |
1373 | case -EKEYEXPIRED: | |
1374 | /* Nothing we can do */ | |
1375 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1376 | return 0; | |
1377 | } | |
1378 | return error; | |
1379 | } | |
1380 | ||
1381 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) | |
1382 | { | |
1383 | struct nfs4_state_owner *sp; | |
1384 | struct nfs_server *server; | |
1385 | struct rb_node *pos; | |
1386 | int status = 0; | |
1387 | ||
1388 | restart: | |
1389 | rcu_read_lock(); | |
1390 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
1391 | spin_lock(&clp->cl_lock); | |
1392 | for (pos = rb_first(&server->state_owners); | |
1393 | pos != NULL; | |
1394 | pos = rb_next(pos)) { | |
1395 | sp = rb_entry(pos, | |
1396 | struct nfs4_state_owner, so_server_node); | |
1397 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1398 | &sp->so_flags)) | |
1399 | continue; | |
1400 | atomic_inc(&sp->so_count); | |
1401 | spin_unlock(&clp->cl_lock); | |
1402 | rcu_read_unlock(); | |
1403 | ||
1404 | status = nfs4_reclaim_open_state(sp, ops); | |
1405 | if (status < 0) { | |
1406 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1407 | nfs4_put_state_owner(sp); | |
1408 | return nfs4_recovery_handle_error(clp, status); | |
1409 | } | |
1410 | ||
1411 | nfs4_put_state_owner(sp); | |
1412 | goto restart; | |
1413 | } | |
1414 | spin_unlock(&clp->cl_lock); | |
1415 | } | |
1416 | rcu_read_unlock(); | |
1417 | return status; | |
1418 | } | |
1419 | ||
1420 | static int nfs4_check_lease(struct nfs_client *clp) | |
1421 | { | |
1422 | struct rpc_cred *cred; | |
1423 | const struct nfs4_state_maintenance_ops *ops = | |
1424 | clp->cl_mvops->state_renewal_ops; | |
1425 | int status = -NFS4ERR_EXPIRED; | |
1426 | ||
1427 | /* Is the client already known to have an expired lease? */ | |
1428 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1429 | return 0; | |
1430 | spin_lock(&clp->cl_lock); | |
1431 | cred = ops->get_state_renewal_cred_locked(clp); | |
1432 | spin_unlock(&clp->cl_lock); | |
1433 | if (cred == NULL) { | |
1434 | cred = nfs4_get_setclientid_cred(clp); | |
1435 | if (cred == NULL) | |
1436 | goto out; | |
1437 | } | |
1438 | status = ops->renew_lease(clp, cred); | |
1439 | put_rpccred(cred); | |
1440 | out: | |
1441 | return nfs4_recovery_handle_error(clp, status); | |
1442 | } | |
1443 | ||
1444 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1445 | { | |
1446 | struct rpc_cred *cred; | |
1447 | const struct nfs4_state_recovery_ops *ops = | |
1448 | clp->cl_mvops->reboot_recovery_ops; | |
1449 | int status = -ENOENT; | |
1450 | ||
1451 | cred = ops->get_clid_cred(clp); | |
1452 | if (cred != NULL) { | |
1453 | status = ops->establish_clid(clp, cred); | |
1454 | put_rpccred(cred); | |
1455 | /* Handle case where the user hasn't set up machine creds */ | |
1456 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1457 | nfs4_clear_machine_cred(clp); | |
1458 | status = -EAGAIN; | |
1459 | } | |
1460 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) | |
1461 | status = -EPROTONOSUPPORT; | |
1462 | } | |
1463 | return status; | |
1464 | } | |
1465 | ||
1466 | #ifdef CONFIG_NFS_V4_1 | |
1467 | void nfs4_schedule_session_recovery(struct nfs4_session *session) | |
1468 | { | |
1469 | nfs4_schedule_lease_recovery(session->clp); | |
1470 | } | |
1471 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); | |
1472 | ||
1473 | void nfs41_handle_recall_slot(struct nfs_client *clp) | |
1474 | { | |
1475 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
1476 | nfs4_schedule_state_manager(clp); | |
1477 | } | |
1478 | ||
1479 | static void nfs4_reset_all_state(struct nfs_client *clp) | |
1480 | { | |
1481 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1482 | clp->cl_boot_time = CURRENT_TIME; | |
1483 | nfs4_state_start_reclaim_nograce(clp); | |
1484 | nfs4_schedule_state_manager(clp); | |
1485 | } | |
1486 | } | |
1487 | ||
1488 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1489 | { | |
1490 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1491 | nfs4_state_start_reclaim_reboot(clp); | |
1492 | nfs4_schedule_state_manager(clp); | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1497 | { | |
1498 | /* Temporary */ | |
1499 | nfs4_reset_all_state(clp); | |
1500 | } | |
1501 | ||
1502 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1503 | { | |
1504 | /* This will need to handle layouts too */ | |
1505 | nfs_expire_all_delegations(clp); | |
1506 | } | |
1507 | ||
1508 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) | |
1509 | { | |
1510 | nfs_expire_all_delegations(clp); | |
1511 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
1512 | nfs4_schedule_state_manager(clp); | |
1513 | } | |
1514 | ||
1515 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) | |
1516 | { | |
1517 | if (!flags) | |
1518 | return; | |
1519 | else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) | |
1520 | nfs41_handle_server_reboot(clp); | |
1521 | else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | | |
1522 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | | |
1523 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
1524 | SEQ4_STATUS_LEASE_MOVED)) | |
1525 | nfs41_handle_state_revoked(clp); | |
1526 | else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) | |
1527 | nfs41_handle_recallable_state_revoked(clp); | |
1528 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
1529 | SEQ4_STATUS_BACKCHANNEL_FAULT | | |
1530 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
1531 | nfs41_handle_cb_path_down(clp); | |
1532 | } | |
1533 | ||
1534 | static int nfs4_reset_session(struct nfs_client *clp) | |
1535 | { | |
1536 | int status; | |
1537 | ||
1538 | nfs4_begin_drain_session(clp); | |
1539 | status = nfs4_proc_destroy_session(clp->cl_session); | |
1540 | if (status && status != -NFS4ERR_BADSESSION && | |
1541 | status != -NFS4ERR_DEADSESSION) { | |
1542 | status = nfs4_recovery_handle_error(clp, status); | |
1543 | goto out; | |
1544 | } | |
1545 | ||
1546 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
1547 | status = nfs4_proc_create_session(clp); | |
1548 | if (status) { | |
1549 | status = nfs4_recovery_handle_error(clp, status); | |
1550 | goto out; | |
1551 | } | |
1552 | /* create_session negotiated new slot table */ | |
1553 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
1554 | ||
1555 | /* Let the state manager reestablish state */ | |
1556 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1557 | nfs41_setup_state_renewal(clp); | |
1558 | out: | |
1559 | return status; | |
1560 | } | |
1561 | ||
1562 | static int nfs4_recall_slot(struct nfs_client *clp) | |
1563 | { | |
1564 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1565 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1566 | struct nfs4_slot *new, *old; | |
1567 | int i; | |
1568 | ||
1569 | nfs4_begin_drain_session(clp); | |
1570 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
1571 | GFP_NOFS); | |
1572 | if (!new) | |
1573 | return -ENOMEM; | |
1574 | ||
1575 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1576 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1577 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1578 | old = fc_tbl->slots; | |
1579 | fc_tbl->slots = new; | |
1580 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1581 | fc_tbl->target_max_slots = 0; | |
1582 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1583 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1584 | ||
1585 | kfree(old); | |
1586 | nfs4_end_drain_session(clp); | |
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | #else /* CONFIG_NFS_V4_1 */ | |
1591 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } | |
1592 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } | |
1593 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } | |
1594 | #endif /* CONFIG_NFS_V4_1 */ | |
1595 | ||
1596 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors | |
1597 | * on EXCHANGE_ID for v4.1 | |
1598 | */ | |
1599 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1600 | { | |
1601 | switch (status) { | |
1602 | case -NFS4ERR_CLID_INUSE: | |
1603 | case -NFS4ERR_STALE_CLIENTID: | |
1604 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1605 | break; | |
1606 | case -NFS4ERR_DELAY: | |
1607 | case -ETIMEDOUT: | |
1608 | case -EAGAIN: | |
1609 | ssleep(1); | |
1610 | break; | |
1611 | ||
1612 | case -EKEYEXPIRED: | |
1613 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1614 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery | |
1615 | * in nfs4_exchange_id */ | |
1616 | default: | |
1617 | return; | |
1618 | } | |
1619 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1620 | } | |
1621 | ||
1622 | static void nfs4_state_manager(struct nfs_client *clp) | |
1623 | { | |
1624 | int status = 0; | |
1625 | ||
1626 | /* Ensure exclusive access to NFSv4 state */ | |
1627 | do { | |
1628 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { | |
1629 | /* We're going to have to re-establish a clientid */ | |
1630 | status = nfs4_reclaim_lease(clp); | |
1631 | if (status) { | |
1632 | nfs4_set_lease_expired(clp, status); | |
1633 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, | |
1634 | &clp->cl_state)) | |
1635 | continue; | |
1636 | if (clp->cl_cons_state == | |
1637 | NFS_CS_SESSION_INITING) | |
1638 | nfs_mark_client_ready(clp, status); | |
1639 | goto out_error; | |
1640 | } | |
1641 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1642 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1643 | pnfs_destroy_all_layouts(clp); | |
1644 | } | |
1645 | ||
1646 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1647 | status = nfs4_check_lease(clp); | |
1648 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1649 | continue; | |
1650 | if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN) | |
1651 | goto out_error; | |
1652 | } | |
1653 | ||
1654 | /* Initialize or reset the session */ | |
1655 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) | |
1656 | && nfs4_has_session(clp)) { | |
1657 | status = nfs4_reset_session(clp); | |
1658 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1659 | continue; | |
1660 | if (status < 0) | |
1661 | goto out_error; | |
1662 | } | |
1663 | ||
1664 | /* First recover reboot state... */ | |
1665 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { | |
1666 | status = nfs4_do_reclaim(clp, | |
1667 | clp->cl_mvops->reboot_recovery_ops); | |
1668 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || | |
1669 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) | |
1670 | continue; | |
1671 | nfs4_state_end_reclaim_reboot(clp); | |
1672 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1673 | continue; | |
1674 | if (status < 0) | |
1675 | goto out_error; | |
1676 | } | |
1677 | ||
1678 | /* Now recover expired state... */ | |
1679 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
1680 | status = nfs4_do_reclaim(clp, | |
1681 | clp->cl_mvops->nograce_recovery_ops); | |
1682 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || | |
1683 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || | |
1684 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1685 | continue; | |
1686 | if (status < 0) | |
1687 | goto out_error; | |
1688 | } | |
1689 | ||
1690 | nfs4_end_drain_session(clp); | |
1691 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { | |
1692 | nfs_client_return_marked_delegations(clp); | |
1693 | continue; | |
1694 | } | |
1695 | /* Recall session slots */ | |
1696 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1697 | && nfs4_has_session(clp)) { | |
1698 | status = nfs4_recall_slot(clp); | |
1699 | if (status < 0) | |
1700 | goto out_error; | |
1701 | continue; | |
1702 | } | |
1703 | ||
1704 | ||
1705 | nfs4_clear_state_manager_bit(clp); | |
1706 | /* Did we race with an attempt to give us more work? */ | |
1707 | if (clp->cl_state == 0) | |
1708 | break; | |
1709 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1710 | break; | |
1711 | } while (atomic_read(&clp->cl_count) > 1); | |
1712 | return; | |
1713 | out_error: | |
1714 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" | |
1715 | " with error %d\n", clp->cl_hostname, -status); | |
1716 | nfs4_end_drain_session(clp); | |
1717 | nfs4_clear_state_manager_bit(clp); | |
1718 | } | |
1719 | ||
1720 | static int nfs4_run_state_manager(void *ptr) | |
1721 | { | |
1722 | struct nfs_client *clp = ptr; | |
1723 | ||
1724 | allow_signal(SIGKILL); | |
1725 | nfs4_state_manager(clp); | |
1726 | nfs_put_client(clp); | |
1727 | module_put_and_exit(0); | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * Local variables: | |
1733 | * c-basic-offset: 8 | |
1734 | * End: | |
1735 | */ |