Commit | Line | Data |
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1da177e4 LT |
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 | ||
6f43ddcc | 41 | #include <linux/kernel.h> |
1da177e4 | 42 | #include <linux/slab.h> |
b89f4321 | 43 | #include <linux/fs.h> |
1da177e4 LT |
44 | #include <linux/nfs_fs.h> |
45 | #include <linux/nfs_idmap.h> | |
5043e900 TM |
46 | #include <linux/kthread.h> |
47 | #include <linux/module.h> | |
9f958ab8 | 48 | #include <linux/random.h> |
8c7597f6 | 49 | #include <linux/ratelimit.h> |
1da177e4 LT |
50 | #include <linux/workqueue.h> |
51 | #include <linux/bitops.h> | |
52 | ||
4ce79717 | 53 | #include "nfs4_fs.h" |
1da177e4 LT |
54 | #include "callback.h" |
55 | #include "delegation.h" | |
24c8dbbb | 56 | #include "internal.h" |
974cec8c | 57 | #include "pnfs.h" |
1da177e4 LT |
58 | |
59 | #define OPENOWNER_POOL_SIZE 8 | |
60 | ||
4ce79717 | 61 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
62 | |
63 | static LIST_HEAD(nfs4_clientid_list); | |
64 | ||
591d71cb | 65 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 66 | { |
bb8b27e5 | 67 | struct nfs4_setclientid_res clid; |
f738f517 CL |
68 | unsigned short port; |
69 | int status; | |
70 | ||
71 | port = nfs_callback_tcpport; | |
72 | if (clp->cl_addr.ss_family == AF_INET6) | |
73 | port = nfs_callback_tcpport6; | |
74 | ||
bb8b27e5 TM |
75 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
76 | if (status != 0) | |
77 | goto out; | |
78 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); | |
79 | if (status != 0) | |
80 | goto out; | |
81 | clp->cl_clientid = clid.clientid; | |
82 | nfs4_schedule_state_renewal(clp); | |
83 | out: | |
1da177e4 LT |
84 | return status; |
85 | } | |
86 | ||
a7b72103 | 87 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
88 | { |
89 | struct rpc_cred *cred = NULL; | |
90 | ||
a2b2bb88 TM |
91 | if (clp->cl_machine_cred != NULL) |
92 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
93 | return cred; |
94 | } | |
95 | ||
96 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
97 | { | |
98 | struct rpc_cred *cred; | |
99 | ||
100 | spin_lock(&clp->cl_lock); | |
101 | cred = clp->cl_machine_cred; | |
102 | clp->cl_machine_cred = NULL; | |
103 | spin_unlock(&clp->cl_lock); | |
104 | if (cred != NULL) | |
105 | put_rpccred(cred); | |
106 | } | |
107 | ||
24d292b8 CL |
108 | static struct rpc_cred * |
109 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
b4454fe1 | 110 | { |
24d292b8 | 111 | struct rpc_cred *cred = NULL; |
b4454fe1 | 112 | struct nfs4_state_owner *sp; |
9f958ab8 | 113 | struct rb_node *pos; |
b4454fe1 | 114 | |
24d292b8 CL |
115 | for (pos = rb_first(&server->state_owners); |
116 | pos != NULL; | |
117 | pos = rb_next(pos)) { | |
118 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
119 | if (list_empty(&sp->so_states)) |
120 | continue; | |
121 | cred = get_rpccred(sp->so_cred); | |
122 | break; | |
123 | } | |
124 | return cred; | |
125 | } | |
126 | ||
24d292b8 CL |
127 | /** |
128 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
129 | * @clp: client state handle | |
130 | * | |
131 | * Returns an rpc_cred with reference count bumped, or NULL. | |
132 | * Caller must hold clp->cl_lock. | |
133 | */ | |
134 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
135 | { | |
136 | struct rpc_cred *cred = NULL; | |
137 | struct nfs_server *server; | |
138 | ||
139 | rcu_read_lock(); | |
140 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
141 | cred = nfs4_get_renew_cred_server_locked(server); | |
142 | if (cred != NULL) | |
143 | break; | |
144 | } | |
145 | rcu_read_unlock(); | |
146 | return cred; | |
147 | } | |
148 | ||
b4b82607 AA |
149 | #if defined(CONFIG_NFS_V4_1) |
150 | ||
9430fb6b RL |
151 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
152 | { | |
153 | int status; | |
154 | struct nfs_fsinfo fsinfo; | |
155 | ||
156 | status = nfs4_proc_get_lease_time(clp, &fsinfo); | |
157 | if (status == 0) { | |
158 | /* Update lease time and schedule renewal */ | |
159 | spin_lock(&clp->cl_lock); | |
160 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
161 | clp->cl_last_renewal = jiffies; | |
162 | spin_unlock(&clp->cl_lock); | |
163 | ||
164 | nfs4_schedule_state_renewal(clp); | |
165 | } | |
166 | ||
167 | return status; | |
168 | } | |
169 | ||
42acd021 AA |
170 | /* |
171 | * Back channel returns NFS4ERR_DELAY for new requests when | |
172 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
173 | * is ended. | |
174 | */ | |
5601a00d | 175 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 176 | { |
5601a00d | 177 | struct nfs4_session *ses = clp->cl_session; |
689cf5c1 AB |
178 | int max_slots; |
179 | ||
a2118c33 TM |
180 | if (ses == NULL) |
181 | return; | |
182 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { | |
689cf5c1 AB |
183 | spin_lock(&ses->fc_slot_table.slot_tbl_lock); |
184 | max_slots = ses->fc_slot_table.max_slots; | |
185 | while (max_slots--) { | |
186 | struct rpc_task *task; | |
187 | ||
188 | task = rpc_wake_up_next(&ses->fc_slot_table. | |
189 | slot_tbl_waitq); | |
190 | if (!task) | |
191 | break; | |
192 | rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); | |
193 | } | |
194 | spin_unlock(&ses->fc_slot_table.slot_tbl_lock); | |
195 | } | |
9dfdf404 RL |
196 | } |
197 | ||
42acd021 | 198 | static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 199 | { |
9dfdf404 | 200 | spin_lock(&tbl->slot_tbl_lock); |
9dfdf404 | 201 | if (tbl->highest_used_slotid != -1) { |
42acd021 | 202 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 203 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 204 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
205 | } |
206 | spin_unlock(&tbl->slot_tbl_lock); | |
207 | return 0; | |
208 | } | |
209 | ||
42acd021 AA |
210 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
211 | { | |
212 | struct nfs4_session *ses = clp->cl_session; | |
213 | int ret = 0; | |
214 | ||
215 | set_bit(NFS4_SESSION_DRAINING, &ses->session_state); | |
216 | /* back channel */ | |
217 | ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); | |
218 | if (ret) | |
219 | return ret; | |
220 | /* fore channel */ | |
221 | return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); | |
222 | } | |
223 | ||
4d643d1d AA |
224 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
225 | { | |
226 | int status; | |
227 | ||
38045412 | 228 | nfs4_begin_drain_session(clp); |
4d643d1d | 229 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
230 | if (status != 0) |
231 | goto out; | |
232 | status = nfs4_proc_create_session(clp); | |
233 | if (status != 0) | |
234 | goto out; | |
235 | nfs41_setup_state_renewal(clp); | |
236 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
237 | out: | |
4d643d1d AA |
238 | return status; |
239 | } | |
240 | ||
b4b82607 AA |
241 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
242 | { | |
243 | struct rpc_cred *cred; | |
244 | ||
245 | spin_lock(&clp->cl_lock); | |
246 | cred = nfs4_get_machine_cred_locked(clp); | |
247 | spin_unlock(&clp->cl_lock); | |
248 | return cred; | |
249 | } | |
250 | ||
251 | #endif /* CONFIG_NFS_V4_1 */ | |
252 | ||
24d292b8 CL |
253 | static struct rpc_cred * |
254 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 255 | { |
24d292b8 CL |
256 | struct nfs_client *clp = server->nfs_client; |
257 | struct rpc_cred *cred = NULL; | |
286d7d6a | 258 | struct nfs4_state_owner *sp; |
9f958ab8 | 259 | struct rb_node *pos; |
24d292b8 CL |
260 | |
261 | spin_lock(&clp->cl_lock); | |
262 | pos = rb_first(&server->state_owners); | |
263 | if (pos != NULL) { | |
264 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
265 | cred = get_rpccred(sp->so_cred); | |
266 | } | |
267 | spin_unlock(&clp->cl_lock); | |
268 | return cred; | |
269 | } | |
270 | ||
271 | /** | |
272 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
273 | * @clp: client state handle | |
274 | * | |
275 | * Returns an rpc_cred with reference count bumped, or NULL. | |
276 | */ | |
277 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
278 | { | |
279 | struct nfs_server *server; | |
a2b2bb88 | 280 | struct rpc_cred *cred; |
286d7d6a | 281 | |
6dc9d57a TM |
282 | spin_lock(&clp->cl_lock); |
283 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 284 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
285 | if (cred != NULL) |
286 | goto out; | |
24d292b8 CL |
287 | |
288 | rcu_read_lock(); | |
289 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
290 | cred = nfs4_get_setclientid_cred_server(server); | |
291 | if (cred != NULL) | |
292 | break; | |
286d7d6a | 293 | } |
24d292b8 CL |
294 | rcu_read_unlock(); |
295 | ||
a2b2bb88 TM |
296 | out: |
297 | return cred; | |
286d7d6a TM |
298 | } |
299 | ||
24d292b8 CL |
300 | static void nfs_alloc_unique_id_locked(struct rb_root *root, |
301 | struct nfs_unique_id *new, | |
302 | __u64 minval, int maxbits) | |
9f958ab8 TM |
303 | { |
304 | struct rb_node **p, *parent; | |
305 | struct nfs_unique_id *pos; | |
306 | __u64 mask = ~0ULL; | |
307 | ||
308 | if (maxbits < 64) | |
309 | mask = (1ULL << maxbits) - 1ULL; | |
310 | ||
311 | /* Ensure distribution is more or less flat */ | |
312 | get_random_bytes(&new->id, sizeof(new->id)); | |
313 | new->id &= mask; | |
314 | if (new->id < minval) | |
315 | new->id += minval; | |
316 | retry: | |
317 | p = &root->rb_node; | |
318 | parent = NULL; | |
319 | ||
320 | while (*p != NULL) { | |
321 | parent = *p; | |
322 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
323 | ||
324 | if (new->id < pos->id) | |
325 | p = &(*p)->rb_left; | |
326 | else if (new->id > pos->id) | |
327 | p = &(*p)->rb_right; | |
328 | else | |
329 | goto id_exists; | |
330 | } | |
331 | rb_link_node(&new->rb_node, parent, p); | |
332 | rb_insert_color(&new->rb_node, root); | |
333 | return; | |
334 | id_exists: | |
335 | for (;;) { | |
336 | new->id++; | |
337 | if (new->id < minval || (new->id & mask) != new->id) { | |
338 | new->id = minval; | |
339 | break; | |
340 | } | |
341 | parent = rb_next(parent); | |
342 | if (parent == NULL) | |
343 | break; | |
344 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
345 | if (new->id < pos->id) | |
346 | break; | |
347 | } | |
348 | goto retry; | |
349 | } | |
350 | ||
351 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
352 | { | |
353 | rb_erase(&id->rb_node, root); | |
354 | } | |
355 | ||
1da177e4 | 356 | static struct nfs4_state_owner * |
24d292b8 | 357 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 358 | { |
24d292b8 | 359 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 360 | *parent = NULL; |
1da177e4 LT |
361 | struct nfs4_state_owner *sp, *res = NULL; |
362 | ||
9f958ab8 TM |
363 | while (*p != NULL) { |
364 | parent = *p; | |
24d292b8 | 365 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 | 366 | |
6f2e64d3 TM |
367 | if (server < sp->so_server) { |
368 | p = &parent->rb_left; | |
369 | continue; | |
370 | } | |
371 | if (server > sp->so_server) { | |
372 | p = &parent->rb_right; | |
373 | continue; | |
374 | } | |
9f958ab8 TM |
375 | if (cred < sp->so_cred) |
376 | p = &parent->rb_left; | |
377 | else if (cred > sp->so_cred) | |
378 | p = &parent->rb_right; | |
379 | else { | |
380 | atomic_inc(&sp->so_count); | |
381 | res = sp; | |
382 | break; | |
383 | } | |
1da177e4 LT |
384 | } |
385 | return res; | |
386 | } | |
387 | ||
9f958ab8 | 388 | static struct nfs4_state_owner * |
24d292b8 | 389 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 390 | { |
24d292b8 CL |
391 | struct nfs_server *server = new->so_server; |
392 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
393 | *parent = NULL; |
394 | struct nfs4_state_owner *sp; | |
395 | ||
396 | while (*p != NULL) { | |
397 | parent = *p; | |
24d292b8 | 398 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
399 | |
400 | if (new->so_cred < sp->so_cred) | |
401 | p = &parent->rb_left; | |
402 | else if (new->so_cred > sp->so_cred) | |
403 | p = &parent->rb_right; | |
404 | else { | |
405 | atomic_inc(&sp->so_count); | |
406 | return sp; | |
407 | } | |
408 | } | |
24d292b8 CL |
409 | nfs_alloc_unique_id_locked(&server->openowner_id, |
410 | &new->so_owner_id, 1, 64); | |
411 | rb_link_node(&new->so_server_node, parent, p); | |
412 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
413 | return new; |
414 | } | |
415 | ||
416 | static void | |
24d292b8 | 417 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 418 | { |
24d292b8 CL |
419 | struct nfs_server *server = sp->so_server; |
420 | ||
421 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
422 | rb_erase(&sp->so_server_node, &server->state_owners); | |
423 | nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id); | |
9f958ab8 TM |
424 | } |
425 | ||
1da177e4 LT |
426 | /* |
427 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
428 | * create a new state_owner. | |
429 | * | |
430 | */ | |
431 | static struct nfs4_state_owner * | |
432 | nfs4_alloc_state_owner(void) | |
433 | { | |
434 | struct nfs4_state_owner *sp; | |
435 | ||
8535b2be | 436 | sp = kzalloc(sizeof(*sp),GFP_NOFS); |
1da177e4 LT |
437 | if (!sp) |
438 | return NULL; | |
ec073428 | 439 | spin_lock_init(&sp->so_lock); |
1da177e4 | 440 | INIT_LIST_HEAD(&sp->so_states); |
cee54fc9 TM |
441 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
442 | sp->so_seqid.sequence = &sp->so_sequence; | |
443 | spin_lock_init(&sp->so_sequence.lock); | |
444 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 LT |
445 | atomic_set(&sp->so_count, 1); |
446 | return sp; | |
447 | } | |
448 | ||
1d2e88e7 | 449 | static void |
1da177e4 LT |
450 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
451 | { | |
24d292b8 CL |
452 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { |
453 | struct nfs_server *server = sp->so_server; | |
454 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
455 | |
456 | spin_lock(&clp->cl_lock); | |
24d292b8 CL |
457 | rb_erase(&sp->so_server_node, &server->state_owners); |
458 | RB_CLEAR_NODE(&sp->so_server_node); | |
9f958ab8 TM |
459 | spin_unlock(&clp->cl_lock); |
460 | } | |
1da177e4 LT |
461 | } |
462 | ||
24d292b8 CL |
463 | /** |
464 | * nfs4_get_state_owner - Look up a state owner given a credential | |
465 | * @server: nfs_server to search | |
466 | * @cred: RPC credential to match | |
467 | * | |
468 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
469 | */ | |
470 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
471 | struct rpc_cred *cred) | |
1da177e4 | 472 | { |
7539bbab | 473 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
474 | struct nfs4_state_owner *sp, *new; |
475 | ||
1da177e4 | 476 | spin_lock(&clp->cl_lock); |
24d292b8 | 477 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 478 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
479 | if (sp != NULL) |
480 | return sp; | |
9f958ab8 TM |
481 | new = nfs4_alloc_state_owner(); |
482 | if (new == NULL) | |
483 | return NULL; | |
6f2e64d3 | 484 | new->so_server = server; |
9f958ab8 TM |
485 | new->so_cred = cred; |
486 | spin_lock(&clp->cl_lock); | |
24d292b8 | 487 | sp = nfs4_insert_state_owner_locked(new); |
9f958ab8 TM |
488 | spin_unlock(&clp->cl_lock); |
489 | if (sp == new) | |
490 | get_rpccred(cred); | |
f6a1cc89 TM |
491 | else { |
492 | rpc_destroy_wait_queue(&new->so_sequence.wait); | |
9f958ab8 | 493 | kfree(new); |
f6a1cc89 | 494 | } |
9f958ab8 | 495 | return sp; |
1da177e4 LT |
496 | } |
497 | ||
24d292b8 CL |
498 | /** |
499 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
500 | * @sp: state owner data to release | |
501 | * | |
502 | */ | |
1da177e4 LT |
503 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
504 | { | |
1f0e890d | 505 | struct nfs_client *clp = sp->so_server->nfs_client; |
1da177e4 LT |
506 | struct rpc_cred *cred = sp->so_cred; |
507 | ||
508 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
509 | return; | |
24d292b8 | 510 | nfs4_remove_state_owner_locked(sp); |
1da177e4 | 511 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 512 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
1da177e4 LT |
513 | put_rpccred(cred); |
514 | kfree(sp); | |
515 | } | |
516 | ||
517 | static struct nfs4_state * | |
518 | nfs4_alloc_open_state(void) | |
519 | { | |
520 | struct nfs4_state *state; | |
521 | ||
8535b2be | 522 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
523 | if (!state) |
524 | return NULL; | |
1da177e4 LT |
525 | atomic_set(&state->count, 1); |
526 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 527 | spin_lock_init(&state->state_lock); |
8bda4e4c | 528 | seqlock_init(&state->seqlock); |
1da177e4 LT |
529 | return state; |
530 | } | |
531 | ||
4cecb76f | 532 | void |
dc0b027d | 533 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 534 | { |
dc0b027d | 535 | if (state->state == fmode) |
4cecb76f TM |
536 | return; |
537 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
538 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
539 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
540 | list_move(&state->open_states, &state->owner->so_states); |
541 | else | |
542 | list_move_tail(&state->open_states, &state->owner->so_states); | |
543 | } | |
dc0b027d | 544 | state->state = fmode; |
4cecb76f TM |
545 | } |
546 | ||
1da177e4 LT |
547 | static struct nfs4_state * |
548 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
549 | { | |
550 | struct nfs_inode *nfsi = NFS_I(inode); | |
551 | struct nfs4_state *state; | |
552 | ||
553 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 554 | if (state->owner != owner) |
1da177e4 | 555 | continue; |
1c816efa | 556 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 557 | return state; |
1da177e4 LT |
558 | } |
559 | return NULL; | |
560 | } | |
561 | ||
1da177e4 LT |
562 | static void |
563 | nfs4_free_open_state(struct nfs4_state *state) | |
564 | { | |
565 | kfree(state); | |
566 | } | |
567 | ||
568 | struct nfs4_state * | |
569 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
570 | { | |
571 | struct nfs4_state *state, *new; | |
572 | struct nfs_inode *nfsi = NFS_I(inode); | |
573 | ||
574 | spin_lock(&inode->i_lock); | |
575 | state = __nfs4_find_state_byowner(inode, owner); | |
576 | spin_unlock(&inode->i_lock); | |
577 | if (state) | |
578 | goto out; | |
579 | new = nfs4_alloc_open_state(); | |
ec073428 | 580 | spin_lock(&owner->so_lock); |
1da177e4 LT |
581 | spin_lock(&inode->i_lock); |
582 | state = __nfs4_find_state_byowner(inode, owner); | |
583 | if (state == NULL && new != NULL) { | |
584 | state = new; | |
1da177e4 LT |
585 | state->owner = owner; |
586 | atomic_inc(&owner->so_count); | |
587 | list_add(&state->inode_states, &nfsi->open_states); | |
588 | state->inode = igrab(inode); | |
589 | spin_unlock(&inode->i_lock); | |
ec073428 TM |
590 | /* Note: The reclaim code dictates that we add stateless |
591 | * and read-only stateids to the end of the list */ | |
592 | list_add_tail(&state->open_states, &owner->so_states); | |
593 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
594 | } else { |
595 | spin_unlock(&inode->i_lock); | |
ec073428 | 596 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
597 | if (new) |
598 | nfs4_free_open_state(new); | |
599 | } | |
600 | out: | |
601 | return state; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | void nfs4_put_open_state(struct nfs4_state *state) |
605 | { | |
606 | struct inode *inode = state->inode; | |
607 | struct nfs4_state_owner *owner = state->owner; | |
608 | ||
ec073428 | 609 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 610 | return; |
ec073428 | 611 | spin_lock(&inode->i_lock); |
ba683031 | 612 | list_del(&state->inode_states); |
1da177e4 | 613 | list_del(&state->open_states); |
ec073428 TM |
614 | spin_unlock(&inode->i_lock); |
615 | spin_unlock(&owner->so_lock); | |
1da177e4 | 616 | iput(inode); |
1da177e4 LT |
617 | nfs4_free_open_state(state); |
618 | nfs4_put_state_owner(owner); | |
619 | } | |
620 | ||
621 | /* | |
83c9d41e | 622 | * Close the current file. |
1da177e4 | 623 | */ |
8535b2be TM |
624 | static void __nfs4_close(struct path *path, struct nfs4_state *state, |
625 | fmode_t fmode, gfp_t gfp_mask, int wait) | |
1da177e4 | 626 | { |
1da177e4 | 627 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 628 | int call_close = 0; |
dc0b027d | 629 | fmode_t newstate; |
1da177e4 LT |
630 | |
631 | atomic_inc(&owner->so_count); | |
1da177e4 | 632 | /* Protect against nfs4_find_state() */ |
ec073428 | 633 | spin_lock(&owner->so_lock); |
dc0b027d | 634 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
635 | case FMODE_READ: |
636 | state->n_rdonly--; | |
637 | break; | |
638 | case FMODE_WRITE: | |
639 | state->n_wronly--; | |
640 | break; | |
641 | case FMODE_READ|FMODE_WRITE: | |
642 | state->n_rdwr--; | |
643 | } | |
003707c7 | 644 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 645 | if (state->n_rdwr == 0) { |
003707c7 | 646 | if (state->n_rdonly == 0) { |
e7616923 | 647 | newstate &= ~FMODE_READ; |
003707c7 TM |
648 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
649 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
650 | } | |
651 | if (state->n_wronly == 0) { | |
e7616923 | 652 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
653 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
654 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
655 | } | |
656 | if (newstate == 0) | |
657 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 658 | } |
003707c7 | 659 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 660 | spin_unlock(&owner->so_lock); |
4cecb76f | 661 | |
003707c7 | 662 | if (!call_close) { |
b39e625b TM |
663 | nfs4_put_open_state(state); |
664 | nfs4_put_state_owner(owner); | |
f7e8917a FI |
665 | } else { |
666 | bool roc = pnfs_roc(state->inode); | |
667 | ||
668 | nfs4_do_close(path, state, gfp_mask, wait, roc); | |
669 | } | |
a49c3c77 TM |
670 | } |
671 | ||
dc0b027d | 672 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 673 | { |
8535b2be | 674 | __nfs4_close(path, state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
675 | } |
676 | ||
dc0b027d | 677 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 678 | { |
8535b2be | 679 | __nfs4_close(path, state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
680 | } |
681 | ||
682 | /* | |
683 | * Search the state->lock_states for an existing lock_owner | |
684 | * that is compatible with current->files | |
685 | */ | |
686 | static struct nfs4_lock_state * | |
77041ed9 | 687 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
688 | { |
689 | struct nfs4_lock_state *pos; | |
690 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 691 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 692 | continue; |
77041ed9 TM |
693 | switch (pos->ls_owner.lo_type) { |
694 | case NFS4_POSIX_LOCK_TYPE: | |
695 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
696 | continue; | |
697 | break; | |
698 | case NFS4_FLOCK_LOCK_TYPE: | |
699 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
700 | continue; | |
701 | } | |
1da177e4 LT |
702 | atomic_inc(&pos->ls_count); |
703 | return pos; | |
704 | } | |
705 | return NULL; | |
706 | } | |
707 | ||
1da177e4 LT |
708 | /* |
709 | * Return a compatible lock_state. If no initialized lock_state structure | |
710 | * exists, return an uninitialized one. | |
711 | * | |
1da177e4 | 712 | */ |
77041ed9 | 713 | 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) |
1da177e4 LT |
714 | { |
715 | struct nfs4_lock_state *lsp; | |
24d292b8 CL |
716 | struct nfs_server *server = state->owner->so_server; |
717 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 718 | |
8535b2be | 719 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
720 | if (lsp == NULL) |
721 | return NULL; | |
d0dc3701 TM |
722 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
723 | spin_lock_init(&lsp->ls_sequence.lock); | |
724 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
725 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 | 726 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 727 | lsp->ls_state = state; |
77041ed9 TM |
728 | lsp->ls_owner.lo_type = type; |
729 | switch (lsp->ls_owner.lo_type) { | |
730 | case NFS4_FLOCK_LOCK_TYPE: | |
731 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
732 | break; | |
733 | case NFS4_POSIX_LOCK_TYPE: | |
734 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
735 | break; | |
736 | default: | |
737 | kfree(lsp); | |
738 | return NULL; | |
739 | } | |
1da177e4 | 740 | spin_lock(&clp->cl_lock); |
24d292b8 | 741 | nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 742 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 743 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
744 | return lsp; |
745 | } | |
746 | ||
9f958ab8 TM |
747 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
748 | { | |
24d292b8 CL |
749 | struct nfs_server *server = lsp->ls_state->owner->so_server; |
750 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
751 | |
752 | spin_lock(&clp->cl_lock); | |
24d292b8 | 753 | nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id); |
9f958ab8 | 754 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 755 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
756 | kfree(lsp); |
757 | } | |
758 | ||
1da177e4 LT |
759 | /* |
760 | * Return a compatible lock_state. If no initialized lock_state structure | |
761 | * exists, return an uninitialized one. | |
762 | * | |
1da177e4 | 763 | */ |
77041ed9 | 764 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 765 | { |
8d0a8a9d | 766 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 767 | |
8d0a8a9d TM |
768 | for(;;) { |
769 | spin_lock(&state->state_lock); | |
77041ed9 | 770 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
771 | if (lsp != NULL) |
772 | break; | |
773 | if (new != NULL) { | |
8d0a8a9d TM |
774 | list_add(&new->ls_locks, &state->lock_states); |
775 | set_bit(LK_STATE_IN_USE, &state->flags); | |
776 | lsp = new; | |
777 | new = NULL; | |
778 | break; | |
779 | } | |
780 | spin_unlock(&state->state_lock); | |
77041ed9 | 781 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
782 | if (new == NULL) |
783 | return NULL; | |
784 | } | |
785 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
786 | if (new != NULL) |
787 | nfs4_free_lock_state(new); | |
1da177e4 LT |
788 | return lsp; |
789 | } | |
790 | ||
791 | /* | |
8d0a8a9d TM |
792 | * Release reference to lock_state, and free it if we see that |
793 | * it is no longer in use | |
1da177e4 | 794 | */ |
faf5f49c | 795 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 796 | { |
8d0a8a9d | 797 | struct nfs4_state *state; |
1da177e4 | 798 | |
8d0a8a9d TM |
799 | if (lsp == NULL) |
800 | return; | |
801 | state = lsp->ls_state; | |
802 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
803 | return; | |
804 | list_del(&lsp->ls_locks); | |
805 | if (list_empty(&state->lock_states)) | |
806 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
807 | spin_unlock(&state->state_lock); | |
d3c7b7cc TM |
808 | if (lsp->ls_flags & NFS_LOCK_INITIALIZED) |
809 | nfs4_release_lockowner(lsp); | |
9f958ab8 | 810 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
811 | } |
812 | ||
8d0a8a9d | 813 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 814 | { |
8d0a8a9d | 815 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 816 | |
8d0a8a9d TM |
817 | dst->fl_u.nfs4_fl.owner = lsp; |
818 | atomic_inc(&lsp->ls_count); | |
819 | } | |
1da177e4 | 820 | |
8d0a8a9d | 821 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 822 | { |
8d0a8a9d | 823 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
824 | } |
825 | ||
6aed6285 | 826 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
827 | .fl_copy_lock = nfs4_fl_copy_lock, |
828 | .fl_release_private = nfs4_fl_release_lock, | |
829 | }; | |
830 | ||
831 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 832 | { |
8d0a8a9d TM |
833 | struct nfs4_lock_state *lsp; |
834 | ||
835 | if (fl->fl_ops != NULL) | |
836 | return 0; | |
77041ed9 TM |
837 | if (fl->fl_flags & FL_POSIX) |
838 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
839 | else if (fl->fl_flags & FL_FLOCK) | |
840 | lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE); | |
841 | else | |
842 | return -EINVAL; | |
8d0a8a9d TM |
843 | if (lsp == NULL) |
844 | return -ENOMEM; | |
845 | fl->fl_u.nfs4_fl.owner = lsp; | |
846 | fl->fl_ops = &nfs4_fl_lock_ops; | |
847 | return 0; | |
1da177e4 LT |
848 | } |
849 | ||
8d0a8a9d TM |
850 | /* |
851 | * Byte-range lock aware utility to initialize the stateid of read/write | |
852 | * requests. | |
1da177e4 | 853 | */ |
77041ed9 | 854 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid) |
1da177e4 | 855 | { |
8d0a8a9d | 856 | struct nfs4_lock_state *lsp; |
8bda4e4c | 857 | int seq; |
1da177e4 | 858 | |
8bda4e4c TM |
859 | do { |
860 | seq = read_seqbegin(&state->seqlock); | |
861 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
862 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
863 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
864 | return; | |
1da177e4 | 865 | |
8d0a8a9d | 866 | spin_lock(&state->state_lock); |
77041ed9 | 867 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
8d0a8a9d TM |
868 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) |
869 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
870 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
871 | nfs4_put_lock_state(lsp); |
872 | } | |
873 | ||
8535b2be | 874 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 875 | { |
cee54fc9 TM |
876 | struct nfs_seqid *new; |
877 | ||
8535b2be | 878 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
879 | if (new != NULL) { |
880 | new->sequence = counter; | |
2f74c0a0 | 881 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
882 | } |
883 | return new; | |
884 | } | |
885 | ||
72211dbe | 886 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 887 | { |
2f74c0a0 TM |
888 | if (!list_empty(&seqid->list)) { |
889 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 890 | |
2f74c0a0 | 891 | spin_lock(&sequence->lock); |
72211dbe | 892 | list_del_init(&seqid->list); |
2f74c0a0 TM |
893 | spin_unlock(&sequence->lock); |
894 | rpc_wake_up(&sequence->wait); | |
895 | } | |
72211dbe TM |
896 | } |
897 | ||
898 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
899 | { | |
900 | nfs_release_seqid(seqid); | |
cee54fc9 | 901 | kfree(seqid); |
1da177e4 LT |
902 | } |
903 | ||
904 | /* | |
cee54fc9 TM |
905 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
906 | * failed with a seqid incrementing error - | |
907 | * see comments nfs_fs.h:seqid_mutating_error() | |
908 | */ | |
88d90939 | 909 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 910 | { |
2f74c0a0 | 911 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
912 | switch (status) { |
913 | case 0: | |
914 | break; | |
915 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
916 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
917 | return; | |
918 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
919 | " sequence-id error on an" |
920 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 921 | seqid->sequence); |
cee54fc9 TM |
922 | case -NFS4ERR_STALE_CLIENTID: |
923 | case -NFS4ERR_STALE_STATEID: | |
924 | case -NFS4ERR_BAD_STATEID: | |
925 | case -NFS4ERR_BADXDR: | |
926 | case -NFS4ERR_RESOURCE: | |
927 | case -NFS4ERR_NOFILEHANDLE: | |
928 | /* Non-seqid mutating errors */ | |
929 | return; | |
930 | }; | |
931 | /* | |
932 | * Note: no locking needed as we are guaranteed to be first | |
933 | * on the sequence list | |
934 | */ | |
935 | seqid->sequence->counter++; | |
936 | } | |
937 | ||
938 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
939 | { | |
34dc1ad7 BH |
940 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
941 | struct nfs4_state_owner, so_seqid); | |
942 | struct nfs_server *server = sp->so_server; | |
943 | ||
944 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 945 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
946 | if (!nfs4_has_session(server->nfs_client)) |
947 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
948 | } |
949 | ||
950 | /* | |
cee54fc9 TM |
951 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
952 | * failed with a seqid incrementing error - | |
953 | * see comments nfs_fs.h:seqid_mutating_error() | |
954 | */ | |
955 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
956 | { | |
88d90939 | 957 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
958 | } |
959 | ||
960 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
961 | { | |
962 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
963 | int status = 0; | |
964 | ||
965 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
966 | if (list_empty(&seqid->list)) |
967 | list_add_tail(&seqid->list, &sequence->list); | |
968 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
969 | goto unlock; | |
5d00837b | 970 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
971 | status = -EAGAIN; |
972 | unlock: | |
cee54fc9 TM |
973 | spin_unlock(&sequence->lock); |
974 | return status; | |
1da177e4 LT |
975 | } |
976 | ||
e005e804 | 977 | static int nfs4_run_state_manager(void *); |
1da177e4 | 978 | |
e005e804 | 979 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
980 | { |
981 | smp_mb__before_clear_bit(); | |
e005e804 | 982 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 983 | smp_mb__after_clear_bit(); |
e005e804 | 984 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
985 | rpc_wake_up(&clp->cl_rpcwaitq); |
986 | } | |
987 | ||
1da177e4 | 988 | /* |
e005e804 | 989 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 990 | */ |
b0d3ded1 | 991 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 992 | { |
5043e900 | 993 | struct task_struct *task; |
1da177e4 | 994 | |
e005e804 TM |
995 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
996 | return; | |
5043e900 TM |
997 | __module_get(THIS_MODULE); |
998 | atomic_inc(&clp->cl_count); | |
e005e804 | 999 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
5d8515ca CL |
1000 | rpc_peeraddr2str(clp->cl_rpcclient, |
1001 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
1002 | if (!IS_ERR(task)) |
1003 | return; | |
e005e804 | 1004 | nfs4_clear_state_manager_bit(clp); |
24c8dbbb | 1005 | nfs_put_client(clp); |
5043e900 | 1006 | module_put(THIS_MODULE); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | /* | |
0400a6b0 | 1010 | * Schedule a lease recovery attempt |
1da177e4 | 1011 | */ |
0400a6b0 | 1012 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1013 | { |
1014 | if (!clp) | |
1015 | return; | |
e598d843 TM |
1016 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1017 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 1018 | nfs4_schedule_state_manager(clp); |
1da177e4 LT |
1019 | } |
1020 | ||
f9feab1e | 1021 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1022 | { |
1023 | ||
1024 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1025 | /* Don't recover state that expired before the reboot */ | |
1026 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1027 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1028 | return 0; | |
1029 | } | |
7eff03ae | 1030 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1031 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1032 | return 1; | |
1033 | } | |
1034 | ||
f9feab1e | 1035 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1036 | { |
1037 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1038 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1039 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1040 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1041 | return 1; | |
1042 | } | |
1043 | ||
0400a6b0 TM |
1044 | void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
1045 | { | |
1046 | struct nfs_client *clp = server->nfs_client; | |
1047 | ||
1048 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1049 | nfs4_schedule_state_manager(clp); | |
1050 | } | |
1051 | ||
02860014 | 1052 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1053 | { |
1054 | struct inode *inode = state->inode; | |
19e03c57 | 1055 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1056 | struct file_lock *fl; |
1057 | int status = 0; | |
1058 | ||
3f09df70 TM |
1059 | if (inode->i_flock == NULL) |
1060 | return 0; | |
1061 | ||
1062 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1063 | down_write(&nfsi->rwsem); |
3f09df70 | 1064 | /* Protect inode->i_flock using the BKL */ |
b89f4321 | 1065 | lock_flocks(); |
90dc7d27 | 1066 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1067 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1068 | continue; |
cd3758e3 | 1069 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1070 | continue; |
b89f4321 | 1071 | unlock_flocks(); |
1da177e4 | 1072 | status = ops->recover_lock(state, fl); |
1da177e4 | 1073 | switch (status) { |
965b5d67 TM |
1074 | case 0: |
1075 | break; | |
1076 | case -ESTALE: | |
1077 | case -NFS4ERR_ADMIN_REVOKED: | |
1078 | case -NFS4ERR_STALE_STATEID: | |
1079 | case -NFS4ERR_BAD_STATEID: | |
1080 | case -NFS4ERR_EXPIRED: | |
1081 | case -NFS4ERR_NO_GRACE: | |
1082 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1083 | case -NFS4ERR_BADSESSION: |
1084 | case -NFS4ERR_BADSLOT: | |
1085 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1086 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1087 | goto out; |
1da177e4 LT |
1088 | default: |
1089 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1090 | __func__, status); |
965b5d67 TM |
1091 | case -ENOMEM: |
1092 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1093 | case -NFS4ERR_RECLAIM_BAD: |
1094 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1095 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1096 | status = 0; |
1da177e4 | 1097 | } |
b89f4321 | 1098 | lock_flocks(); |
1da177e4 | 1099 | } |
b89f4321 | 1100 | unlock_flocks(); |
965b5d67 | 1101 | out: |
19e03c57 | 1102 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1103 | return status; |
1104 | } | |
1105 | ||
02860014 | 1106 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1107 | { |
1108 | struct nfs4_state *state; | |
1109 | struct nfs4_lock_state *lock; | |
1110 | int status = 0; | |
1111 | ||
1112 | /* Note: we rely on the sp->so_states list being ordered | |
1113 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1114 | * states first. | |
1115 | * This is needed to ensure that the server won't give us any | |
1116 | * read delegations that we have to return if, say, we are | |
1117 | * recovering after a network partition or a reboot from a | |
1118 | * server that doesn't support a grace period. | |
1119 | */ | |
fe1d8195 TM |
1120 | restart: |
1121 | spin_lock(&sp->so_lock); | |
1da177e4 | 1122 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1123 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1124 | continue; | |
1da177e4 LT |
1125 | if (state->state == 0) |
1126 | continue; | |
fe1d8195 TM |
1127 | atomic_inc(&state->count); |
1128 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1129 | status = ops->recover_open(sp, state); |
1da177e4 | 1130 | if (status >= 0) { |
02860014 TM |
1131 | status = nfs4_reclaim_locks(state, ops); |
1132 | if (status >= 0) { | |
1133 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1134 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
1135 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 1136 | __func__); |
02860014 | 1137 | } |
fe1d8195 TM |
1138 | nfs4_put_open_state(state); |
1139 | goto restart; | |
1da177e4 | 1140 | } |
1da177e4 LT |
1141 | } |
1142 | switch (status) { | |
1143 | default: | |
1144 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1145 | __func__, status); |
1da177e4 | 1146 | case -ENOENT: |
965b5d67 | 1147 | case -ENOMEM: |
b79a4a1b | 1148 | case -ESTALE: |
1da177e4 LT |
1149 | /* |
1150 | * Open state on this file cannot be recovered | |
1151 | * All we can do is revert to using the zero stateid. | |
1152 | */ | |
1153 | memset(state->stateid.data, 0, | |
1154 | sizeof(state->stateid.data)); | |
1155 | /* Mark the file as being 'closed' */ | |
1156 | state->state = 0; | |
1157 | break; | |
168667c4 TM |
1158 | case -EKEYEXPIRED: |
1159 | /* | |
1160 | * User RPCSEC_GSS context has expired. | |
1161 | * We cannot recover this stateid now, so | |
1162 | * skip it and allow recovery thread to | |
1163 | * proceed. | |
1164 | */ | |
1165 | break; | |
965b5d67 TM |
1166 | case -NFS4ERR_ADMIN_REVOKED: |
1167 | case -NFS4ERR_STALE_STATEID: | |
1168 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1169 | case -NFS4ERR_RECLAIM_BAD: |
1170 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1171 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1172 | break; |
1da177e4 LT |
1173 | case -NFS4ERR_EXPIRED: |
1174 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1175 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1176 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1177 | case -NFS4ERR_BADSESSION: |
1178 | case -NFS4ERR_BADSLOT: | |
1179 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1180 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1181 | goto out_err; |
1182 | } | |
fe1d8195 TM |
1183 | nfs4_put_open_state(state); |
1184 | goto restart; | |
1da177e4 | 1185 | } |
fe1d8195 | 1186 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1187 | return 0; |
1188 | out_err: | |
fe1d8195 | 1189 | nfs4_put_open_state(state); |
1da177e4 LT |
1190 | return status; |
1191 | } | |
1192 | ||
b79a4a1b TM |
1193 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1194 | { | |
1195 | struct nfs4_lock_state *lock; | |
1196 | ||
1197 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1198 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1199 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1200 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
1201 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
b79a4a1b TM |
1202 | lock->ls_seqid.flags = 0; |
1203 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1204 | } | |
1205 | } | |
1206 | ||
24d292b8 CL |
1207 | static void nfs4_reset_seqids(struct nfs_server *server, |
1208 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1209 | { |
24d292b8 | 1210 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1211 | struct nfs4_state_owner *sp; |
9f958ab8 | 1212 | struct rb_node *pos; |
cee54fc9 | 1213 | struct nfs4_state *state; |
cee54fc9 | 1214 | |
24d292b8 CL |
1215 | spin_lock(&clp->cl_lock); |
1216 | for (pos = rb_first(&server->state_owners); | |
1217 | pos != NULL; | |
1218 | pos = rb_next(pos)) { | |
1219 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1220 | sp->so_seqid.flags = 0; |
ec073428 | 1221 | spin_lock(&sp->so_lock); |
cee54fc9 | 1222 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1223 | if (mark_reclaim(clp, state)) |
1224 | nfs4_clear_open_state(state); | |
cee54fc9 | 1225 | } |
ec073428 | 1226 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1227 | } |
24d292b8 CL |
1228 | spin_unlock(&clp->cl_lock); |
1229 | } | |
1230 | ||
1231 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1232 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1233 | { | |
1234 | struct nfs_server *server; | |
1235 | ||
1236 | rcu_read_lock(); | |
1237 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1238 | nfs4_reset_seqids(server, mark_reclaim); | |
1239 | rcu_read_unlock(); | |
cee54fc9 TM |
1240 | } |
1241 | ||
b79a4a1b TM |
1242 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1243 | { | |
1244 | /* Mark all delegations for reclaim */ | |
1245 | nfs_delegation_mark_reclaim(clp); | |
1246 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1247 | } | |
1248 | ||
fce5c838 RL |
1249 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1250 | const struct nfs4_state_recovery_ops *ops) | |
1251 | { | |
1252 | /* Notify the server we're done reclaiming our state */ | |
1253 | if (ops->reclaim_complete) | |
1254 | (void)ops->reclaim_complete(clp); | |
1255 | } | |
1256 | ||
24d292b8 | 1257 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1258 | { |
24d292b8 | 1259 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1260 | struct nfs4_state_owner *sp; |
1261 | struct rb_node *pos; | |
1262 | struct nfs4_state *state; | |
1263 | ||
24d292b8 CL |
1264 | spin_lock(&clp->cl_lock); |
1265 | for (pos = rb_first(&server->state_owners); | |
1266 | pos != NULL; | |
1267 | pos = rb_next(pos)) { | |
1268 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1269 | spin_lock(&sp->so_lock); |
1270 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1271 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1272 | &state->flags)) | |
b79a4a1b TM |
1273 | continue; |
1274 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1275 | } | |
1276 | spin_unlock(&sp->so_lock); | |
1277 | } | |
24d292b8 CL |
1278 | spin_unlock(&clp->cl_lock); |
1279 | } | |
1280 | ||
1281 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1282 | { | |
1283 | struct nfs_server *server; | |
1284 | ||
1285 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1286 | return 0; | |
1287 | ||
1288 | rcu_read_lock(); | |
1289 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1290 | nfs4_clear_reclaim_server(server); | |
1291 | rcu_read_unlock(); | |
b79a4a1b TM |
1292 | |
1293 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1294 | return 1; |
1295 | } | |
1296 | ||
1297 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1298 | { | |
1299 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1300 | return; | |
1301 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
b79a4a1b TM |
1302 | } |
1303 | ||
1304 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1305 | { | |
1306 | nfs_delegation_mark_reclaim(clp); | |
1307 | nfs_delegation_reap_unclaimed(clp); | |
1308 | } | |
1309 | ||
1310 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1311 | { | |
1312 | nfs_delegation_clear_all(clp); | |
1313 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1314 | } | |
1315 | ||
168667c4 TM |
1316 | static void nfs4_warn_keyexpired(const char *s) |
1317 | { | |
1318 | printk_ratelimited(KERN_WARNING "Error: state manager" | |
1319 | " encountered RPCSEC_GSS session" | |
1320 | " expired against NFSv4 server %s.\n", | |
1321 | s); | |
1322 | } | |
1323 | ||
4f7cdf18 | 1324 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1325 | { |
1326 | switch (error) { | |
1327 | case -NFS4ERR_CB_PATH_DOWN: | |
707fb4b3 | 1328 | nfs_handle_cb_pathdown(clp); |
4f7cdf18 | 1329 | return 0; |
c8b7ae3d TM |
1330 | case -NFS4ERR_NO_GRACE: |
1331 | nfs4_state_end_reclaim_reboot(clp); | |
1332 | return 0; | |
e598d843 TM |
1333 | case -NFS4ERR_STALE_CLIENTID: |
1334 | case -NFS4ERR_LEASE_MOVED: | |
1335 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1336 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1337 | nfs4_state_start_reclaim_reboot(clp); |
1338 | break; | |
1339 | case -NFS4ERR_EXPIRED: | |
1340 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1341 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1342 | break; |
c3fad1b1 AA |
1343 | case -NFS4ERR_BADSESSION: |
1344 | case -NFS4ERR_BADSLOT: | |
1345 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1346 | case -NFS4ERR_DEADSESSION: | |
1347 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1348 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1349 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1350 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 AA |
1351 | /* Zero session reset errors */ |
1352 | return 0; | |
168667c4 TM |
1353 | case -EKEYEXPIRED: |
1354 | /* Nothing we can do */ | |
1355 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1356 | return 0; | |
e598d843 | 1357 | } |
4f7cdf18 | 1358 | return error; |
e598d843 TM |
1359 | } |
1360 | ||
02860014 | 1361 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1362 | { |
24d292b8 CL |
1363 | struct nfs4_state_owner *sp; |
1364 | struct nfs_server *server; | |
9f958ab8 | 1365 | struct rb_node *pos; |
1da177e4 LT |
1366 | int status = 0; |
1367 | ||
7eff03ae | 1368 | restart: |
24d292b8 CL |
1369 | rcu_read_lock(); |
1370 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
1371 | spin_lock(&clp->cl_lock); | |
1372 | for (pos = rb_first(&server->state_owners); | |
1373 | pos != NULL; | |
1374 | pos = rb_next(pos)) { | |
1375 | sp = rb_entry(pos, | |
1376 | struct nfs4_state_owner, so_server_node); | |
1377 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1378 | &sp->so_flags)) | |
1379 | continue; | |
1380 | atomic_inc(&sp->so_count); | |
1381 | spin_unlock(&clp->cl_lock); | |
1382 | rcu_read_unlock(); | |
1383 | ||
1384 | status = nfs4_reclaim_open_state(sp, ops); | |
1385 | if (status < 0) { | |
1386 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1387 | nfs4_put_state_owner(sp); | |
1388 | return nfs4_recovery_handle_error(clp, status); | |
1389 | } | |
1390 | ||
7eff03ae | 1391 | nfs4_put_state_owner(sp); |
24d292b8 | 1392 | goto restart; |
7eff03ae | 1393 | } |
24d292b8 | 1394 | spin_unlock(&clp->cl_lock); |
02860014 | 1395 | } |
24d292b8 | 1396 | rcu_read_unlock(); |
02860014 TM |
1397 | return status; |
1398 | } | |
1399 | ||
1400 | static int nfs4_check_lease(struct nfs_client *clp) | |
1401 | { | |
1402 | struct rpc_cred *cred; | |
c48f4f35 TM |
1403 | const struct nfs4_state_maintenance_ops *ops = |
1404 | clp->cl_mvops->state_renewal_ops; | |
02860014 | 1405 | int status = -NFS4ERR_EXPIRED; |
1da177e4 | 1406 | |
0f605b56 TM |
1407 | /* Is the client already known to have an expired lease? */ |
1408 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1409 | return 0; | |
a7b72103 AA |
1410 | spin_lock(&clp->cl_lock); |
1411 | cred = ops->get_state_renewal_cred_locked(clp); | |
1412 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1413 | if (cred == NULL) { |
1414 | cred = nfs4_get_setclientid_cred(clp); | |
1415 | if (cred == NULL) | |
1416 | goto out; | |
286d7d6a | 1417 | } |
8e69514f | 1418 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1419 | put_rpccred(cred); |
1420 | out: | |
4f7cdf18 | 1421 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1422 | } |
1423 | ||
1424 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1425 | { | |
1426 | struct rpc_cred *cred; | |
c48f4f35 TM |
1427 | const struct nfs4_state_recovery_ops *ops = |
1428 | clp->cl_mvops->reboot_recovery_ops; | |
02860014 TM |
1429 | int status = -ENOENT; |
1430 | ||
90a16617 | 1431 | cred = ops->get_clid_cred(clp); |
286d7d6a | 1432 | if (cred != NULL) { |
591d71cb | 1433 | status = ops->establish_clid(clp, cred); |
286d7d6a | 1434 | put_rpccred(cred); |
a2b2bb88 TM |
1435 | /* Handle case where the user hasn't set up machine creds */ |
1436 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1437 | nfs4_clear_machine_cred(clp); | |
02860014 | 1438 | status = -EAGAIN; |
a2b2bb88 | 1439 | } |
c2e713dd BH |
1440 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1441 | status = -EPROTONOSUPPORT; | |
286d7d6a | 1442 | } |
02860014 TM |
1443 | return status; |
1444 | } | |
1445 | ||
76db6d95 | 1446 | #ifdef CONFIG_NFS_V4_1 |
0400a6b0 TM |
1447 | void nfs4_schedule_session_recovery(struct nfs4_session *session) |
1448 | { | |
1449 | nfs4_schedule_lease_recovery(session->clp); | |
1450 | } | |
1451 | ||
b9efa1b2 AA |
1452 | void nfs41_handle_recall_slot(struct nfs_client *clp) |
1453 | { | |
1454 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
0400a6b0 | 1455 | nfs4_schedule_state_manager(clp); |
b9efa1b2 AA |
1456 | } |
1457 | ||
0f79fd6f TM |
1458 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1459 | { | |
1460 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1461 | clp->cl_boot_time = CURRENT_TIME; | |
1462 | nfs4_state_start_reclaim_nograce(clp); | |
0400a6b0 | 1463 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1464 | } |
1465 | } | |
1466 | ||
1467 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1468 | { | |
1469 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1470 | nfs4_state_start_reclaim_reboot(clp); | |
0400a6b0 | 1471 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1472 | } |
1473 | } | |
1474 | ||
1475 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1476 | { | |
1477 | /* Temporary */ | |
1478 | nfs4_reset_all_state(clp); | |
1479 | } | |
1480 | ||
1481 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1482 | { | |
1483 | /* This will need to handle layouts too */ | |
1484 | nfs_expire_all_delegations(clp); | |
1485 | } | |
1486 | ||
1487 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) | |
1488 | { | |
1489 | nfs_expire_all_delegations(clp); | |
1490 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1491 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1492 | } |
1493 | ||
0629e370 AB |
1494 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1495 | { | |
1496 | if (!flags) | |
1497 | return; | |
0f79fd6f TM |
1498 | else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
1499 | nfs41_handle_server_reboot(clp); | |
1500 | else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | | |
0629e370 AB |
1501 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
1502 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
1503 | SEQ4_STATUS_LEASE_MOVED)) |
1504 | nfs41_handle_state_revoked(clp); | |
1505 | else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) | |
1506 | nfs41_handle_recallable_state_revoked(clp); | |
1507 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
0629e370 AB |
1508 | SEQ4_STATUS_BACKCHANNEL_FAULT | |
1509 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 1510 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
1511 | } |
1512 | ||
c3fad1b1 AA |
1513 | static int nfs4_reset_session(struct nfs_client *clp) |
1514 | { | |
1515 | int status; | |
1516 | ||
38045412 | 1517 | nfs4_begin_drain_session(clp); |
c3fad1b1 AA |
1518 | status = nfs4_proc_destroy_session(clp->cl_session); |
1519 | if (status && status != -NFS4ERR_BADSESSION && | |
1520 | status != -NFS4ERR_DEADSESSION) { | |
f455848a | 1521 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
1522 | goto out; |
1523 | } | |
1524 | ||
1525 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
f26468fb | 1526 | status = nfs4_proc_create_session(clp); |
41f54a55 | 1527 | if (status) { |
f455848a | 1528 | status = nfs4_recovery_handle_error(clp, status); |
41f54a55 AA |
1529 | goto out; |
1530 | } | |
1531 | /* create_session negotiated new slot table */ | |
1532 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
9dfdf404 | 1533 | |
41f54a55 AA |
1534 | /* Let the state manager reestablish state */ |
1535 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
5601a00d | 1536 | nfs41_setup_state_renewal(clp); |
41f54a55 | 1537 | out: |
c3fad1b1 AA |
1538 | return status; |
1539 | } | |
76db6d95 | 1540 | |
b9efa1b2 AA |
1541 | static int nfs4_recall_slot(struct nfs_client *clp) |
1542 | { | |
1543 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1544 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1545 | struct nfs4_slot *new, *old; | |
1546 | int i; | |
1547 | ||
1548 | nfs4_begin_drain_session(clp); | |
1549 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
8535b2be | 1550 | GFP_NOFS); |
b9efa1b2 AA |
1551 | if (!new) |
1552 | return -ENOMEM; | |
1553 | ||
1554 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1555 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1556 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1557 | old = fc_tbl->slots; | |
1558 | fc_tbl->slots = new; | |
1559 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1560 | fc_tbl->target_max_slots = 0; | |
1561 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1562 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1563 | ||
1564 | kfree(old); | |
1565 | nfs4_end_drain_session(clp); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
76db6d95 | 1569 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 1570 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 1571 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
b9efa1b2 | 1572 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } |
76db6d95 AA |
1573 | #endif /* CONFIG_NFS_V4_1 */ |
1574 | ||
78722e9c AA |
1575 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1576 | * on EXCHANGE_ID for v4.1 | |
1577 | */ | |
1578 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1579 | { | |
1580 | if (nfs4_has_session(clp)) { | |
1581 | switch (status) { | |
1582 | case -NFS4ERR_DELAY: | |
1583 | case -NFS4ERR_CLID_INUSE: | |
1584 | case -EAGAIN: | |
1585 | break; | |
1586 | ||
168667c4 TM |
1587 | case -EKEYEXPIRED: |
1588 | nfs4_warn_keyexpired(clp->cl_hostname); | |
78722e9c AA |
1589 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1590 | * in nfs4_exchange_id */ | |
1591 | default: | |
1592 | return; | |
1593 | } | |
1594 | } | |
1595 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1596 | } | |
1597 | ||
e005e804 | 1598 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1599 | { |
02860014 TM |
1600 | int status = 0; |
1601 | ||
02860014 | 1602 | /* Ensure exclusive access to NFSv4 state */ |
f3c76491 | 1603 | for(;;) { |
b79a4a1b TM |
1604 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1605 | /* We're going to have to re-establish a clientid */ | |
1606 | status = nfs4_reclaim_lease(clp); | |
1607 | if (status) { | |
78722e9c | 1608 | nfs4_set_lease_expired(clp, status); |
b6d408ba TM |
1609 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, |
1610 | &clp->cl_state)) | |
b79a4a1b | 1611 | continue; |
76db6d95 AA |
1612 | if (clp->cl_cons_state == |
1613 | NFS_CS_SESSION_INITING) | |
1614 | nfs_mark_client_ready(clp, status); | |
b79a4a1b TM |
1615 | goto out_error; |
1616 | } | |
e598d843 | 1617 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
7cab89b2 | 1618 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
974cec8c | 1619 | pnfs_destroy_all_layouts(clp); |
e598d843 TM |
1620 | } |
1621 | ||
1622 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1623 | status = nfs4_check_lease(clp); | |
b6d408ba | 1624 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
e598d843 | 1625 | continue; |
b6d408ba TM |
1626 | if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN) |
1627 | goto out_error; | |
b79a4a1b | 1628 | } |
b6d408ba | 1629 | |
c3fad1b1 | 1630 | /* Initialize or reset the session */ |
6df08189 | 1631 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) |
7111dc73 | 1632 | && nfs4_has_session(clp)) { |
4d643d1d | 1633 | status = nfs4_reset_session(clp); |
b6d408ba TM |
1634 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1635 | continue; | |
1636 | if (status < 0) | |
76db6d95 | 1637 | goto out_error; |
76db6d95 | 1638 | } |
b6d408ba | 1639 | |
b79a4a1b | 1640 | /* First recover reboot state... */ |
e345e88a | 1641 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
591d71cb | 1642 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1643 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 1644 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1645 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 1646 | continue; |
b79a4a1b | 1647 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
1648 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
1649 | continue; | |
1650 | if (status < 0) | |
1651 | goto out_error; | |
02860014 TM |
1652 | } |
1653 | ||
b79a4a1b TM |
1654 | /* Now recover expired state... */ |
1655 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb | 1656 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1657 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 1658 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1659 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
1660 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1661 | continue; | |
1662 | if (status < 0) | |
b79a4a1b | 1663 | goto out_error; |
1da177e4 | 1664 | } |
707fb4b3 | 1665 | |
5601a00d | 1666 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
1667 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
1668 | nfs_client_return_marked_delegations(clp); | |
1669 | continue; | |
1670 | } | |
b9efa1b2 AA |
1671 | /* Recall session slots */ |
1672 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1673 | && nfs4_has_session(clp)) { | |
1674 | status = nfs4_recall_slot(clp); | |
1675 | if (status < 0) | |
1676 | goto out_error; | |
1677 | continue; | |
1678 | } | |
1679 | ||
e005e804 TM |
1680 | |
1681 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1682 | /* Did we race with an attempt to give us more work? */ |
1683 | if (clp->cl_state == 0) | |
1684 | break; | |
1685 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1686 | break; | |
1da177e4 | 1687 | } |
e005e804 | 1688 | return; |
1da177e4 | 1689 | out_error: |
e005e804 | 1690 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
5d8515ca | 1691 | " with error %d\n", clp->cl_hostname, -status); |
5601a00d | 1692 | nfs4_end_drain_session(clp); |
e005e804 TM |
1693 | nfs4_clear_state_manager_bit(clp); |
1694 | } | |
1695 | ||
1696 | static int nfs4_run_state_manager(void *ptr) | |
1697 | { | |
1698 | struct nfs_client *clp = ptr; | |
1699 | ||
1700 | allow_signal(SIGKILL); | |
1701 | nfs4_state_manager(clp); | |
1702 | nfs_put_client(clp); | |
1703 | module_put_and_exit(0); | |
1704 | return 0; | |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | /* | |
1708 | * Local variables: | |
1709 | * c-basic-offset: 8 | |
1710 | * End: | |
1711 | */ |